October 2012 - tor-commits - lists.torproject.org

[tor/master] Add initial circuitmux_ewma.{c,h}
by andrea＠torproject.org 11 Oct '12

11 Oct '12

commit 184560c4f6fa8262fe1316d5e169a16b47b11e6b Author: Andrea Shepard <andrea(a)torproject.org> Date: Sun Sep 30 21:41:25 2012 -0700 Add initial circuitmux_ewma.{c,h} --- src/or/Makefile.nmake | 16 ++++++++-------- src/or/circuitmux_ewma.c | 12 ++++++++++++ src/or/circuitmux_ewma.h | 18 ++++++++++++++++++ src/or/include.am | 2 ++ 4 files changed, 40 insertions(+), 8 deletions(-) diff --git a/src/or/Makefile.nmake b/src/or/Makefile.nmake index 9f948d6..677618e 100644 --- a/src/or/Makefile.nmake +++ b/src/or/Makefile.nmake @@ -9,14 +9,14 @@ LIBS = ..\..\..\build-alpha\lib\libevent.a \ ws2_32.lib advapi32.lib shell32.lib LIBTOR_OBJECTS = buffers.obj channel.obj channeltls.obj circuitbuild.obj \ - circuitlist.obj circuitmux.obj circuituse.obj command.obj config.obj \ - connection.obj connection_edge.obj connection_or.obj control.obj \ - cpuworker.obj directory.obj dirserv.obj dirvote.obj dns.obj \ - dnsserv.obj geoip.obj hibernate.obj main.obj microdesc.obj \ - networkstatus.obj nodelist.obj onion.obj policies.obj reasons.obj \ - relay.obj rendclient.obj rendcommon.obj rendmid.obj rendservice.obj \ - rephist.obj router.obj routerlist.obj routerparse.obj status.obj \ - config_codedigest.obj ntmain.obj + circuitlist.obj circuitmux.obj circuitmux_ewma.obj circuituse.obj \ + command.obj config.obj connection.obj connection_edge.obj \ + connection_or.obj control.obj cpuworker.obj directory.obj \ + dirserv.obj dirvote.obj dns.obj dnsserv.obj geoip.obj hibernate.obj \ + main.obj microdesc.obj networkstatus.obj nodelist.obj onion.obj \ + policies.obj reasons.obj relay.obj rendclient.obj rendcommon.obj \ + rendmid.obj rendservice.obj rephist.obj router.obj routerlist.obj \ + routerparse.obj status.obj config_codedigest.obj ntmain.obj libtor.lib: $(LIBTOR_OBJECTS) lib $(LIBTOR_OBJECTS) /out:libtor.lib diff --git a/src/or/circuitmux_ewma.c b/src/or/circuitmux_ewma.c new file mode 100644 index 0000000..b31e908 --- /dev/null +++ b/src/or/circuitmux_ewma.c @@ -0,0 +1,12 @@ +/* * Copyright (c) 2012, The Tor Project, Inc. */ +/* See LICENSE for licensing information */ + +/** + * \file circuitmux_ewma.c + * \brief EWMA circuit selection as a circuitmux_t policy + **/ + +#include "or.h" +#include "circuitmux.h" +#include "circuitmux_ewma.h" + diff --git a/src/or/circuitmux_ewma.h b/src/or/circuitmux_ewma.h new file mode 100644 index 0000000..fcbe298 --- /dev/null +++ b/src/or/circuitmux_ewma.h @@ -0,0 +1,18 @@ +/* * Copyright (c) 2012, The Tor Project, Inc. */ +/* See LICENSE for licensing information */ + +/** + * \file circuitmux_ewma.h + * \brief Header file for circuitmux_ewma.c + **/ + +#ifndef _TOR_CIRCUITMUX_EWMA_H +#define _TOR_CIRCUITMUX_EWMA_H + +#include "or.h" +#include "circuitmux.h" + +/* TODO */ + +#endif /* _TOR_CIRCUITMUX_EWMA_H */ + diff --git a/src/or/include.am b/src/or/include.am index 3ec94e5..90dea44 100644 --- a/src/or/include.am +++ b/src/or/include.am @@ -22,6 +22,7 @@ src_or_libtor_a_SOURCES = \ src/or/circuitbuild.c \ src/or/circuitlist.c \ src/or/circuitmux.c \ + src/or/circuitmux_ewma.c \ src/or/circuituse.c \ src/or/command.c \ src/or/config.c \ @@ -94,6 +95,7 @@ ORHEADERS = \ src/or/circuitbuild.h \ src/or/circuitlist.h \ src/or/circuitmux.h \ + src/or/circuitmux_ewma.h \ src/or/circuituse.h \ src/or/command.h \ src/or/config.h \

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[tor/master] Move all EWMA code into circuitmux.c and implement circuitmux_policy_t methods using it
by andrea＠torproject.org 11 Oct '12

11 Oct '12

commit bbb2c31d26f2eb1ad46433bcfd321d960a6c7862 Author: Andrea Shepard <andrea(a)torproject.org> Date: Mon Oct 1 01:54:42 2012 -0700 Move all EWMA code into circuitmux.c and implement circuitmux_policy_t methods using it --- src/or/circuitmux_ewma.c | 666 ++++++++++++++++++++++++++++++++++++++++++++++ src/or/circuitmux_ewma.h | 12 +- 2 files changed, 677 insertions(+), 1 deletions(-) diff --git a/src/or/circuitmux_ewma.c b/src/or/circuitmux_ewma.c index b31e908..6d4fcc9 100644 --- a/src/or/circuitmux_ewma.c +++ b/src/or/circuitmux_ewma.c @@ -6,7 +6,673 @@ * \brief EWMA circuit selection as a circuitmux_t policy **/ +#define _TOR_CIRCUITMUX_EWMA_C + +#include <math.h> + #include "or.h" #include "circuitmux.h" #include "circuitmux_ewma.h" +#include "networkstatus.h" + +/*** EWMA parameter #defines ***/ + +/** How long does a tick last (seconds)? */ +#define EWMA_TICK_LEN 10 + +/** The default per-tick scale factor, if it hasn't been overridden by a + * consensus or a configuration setting. zero means "disabled". */ +#define EWMA_DEFAULT_HALFLIFE 0.0 + +/*** Some useful constant #defines ***/ + +/*DOCDOC*/ +#define EPSILON 0.00001 +/*DOCDOC*/ +#define LOG_ONEHALF -0.69314718055994529 + +/*** EWMA structures ***/ + +typedef struct cell_ewma_s cell_ewma_t; +typedef struct ewma_policy_data_s ewma_policy_data_t; +typedef struct ewma_policy_circ_data_s ewma_policy_circ_data_t; + +/** + * The cell_ewma_t structure keeps track of how many cells a circuit has + * transferred recently. It keeps an EWMA (exponentially weighted moving + * average) of the number of cells flushed from the circuit queue onto a + * connection in channel_flush_from_first_active_circuit(). + */ + +struct cell_ewma_s { + /** The last 'tick' at which we recalibrated cell_count. + * + * A cell sent at exactly the start of this tick has weight 1.0. Cells sent + * since the start of this tick have weight greater than 1.0; ones sent + * earlier have less weight. */ + unsigned int last_adjusted_tick; + /** The EWMA of the cell count. */ + double cell_count; + /** True iff this is the cell count for a circuit's previous + * channel. */ + unsigned int is_for_p_chan : 1; + /** The position of the circuit within the OR connection's priority + * queue. */ + int heap_index; +}; + +struct ewma_policy_data_s { + circuitmux_policy_data_t _base; + + /** + * Priority queue of cell_ewma_t for circuits with queued cells waiting + * for room to free up on the channel that owns this circuitmux. Kept + * in heap order according to EWMA. This was formerly in channel_t, and + * in or_connection_t before that. + */ + smartlist_t *active_circuit_pqueue; + + /** + * The tick on which the cell_ewma_ts in active_circuit_pqueue last had + * their ewma values rescaled. This was formerly in channel_t, and in + * or_connection_t before that. + */ + unsigned int active_circuit_pqueue_last_recalibrated; +}; + +struct ewma_policy_circ_data_s { + circuitmux_policy_circ_data_t _base; + + /** + * The EWMA count for the number of cells flushed from this circuit + * onto this circuitmux. Used to determine which circuit to flush + * from next. This was formerly in circuit_t and or_circuit_t. + */ + cell_ewma_t cell_ewma; + + /** + * Pointer back to the circuit_t this is for; since we're separating + * out circuit selection policy like this, we can't attach cell_ewma_t + * to the circuit_t any more, so we can't use SUBTYPE_P directly to a + * circuit_t like before; instead get it here. + */ + circuit_t *circ; +}; + +#define EWMA_POL_DATA_MAGIC 0x2fd8b16aU +#define EWMA_POL_CIRC_DATA_MAGIC 0x761e7747U + +/*** Downcasts for the above types ***/ + +static ewma_policy_data_t * +TO_EWMA_POL_DATA(circuitmux_policy_data_t *); + +static ewma_policy_circ_data_t * +TO_EWMA_POL_CIRC_DATA(circuitmux_policy_circ_data_t *); + +/** + * Downcast a circuitmux_policy_data_t to an ewma_policy_data_t and assert + * if the cast is impossible. + */ + +static INLINE ewma_policy_data_t * +TO_EWMA_POL_DATA(circuitmux_policy_data_t *pol) +{ + if (!pol) return NULL; + else { + tor_assert(pol->magic == EWMA_POL_DATA_MAGIC); + return DOWNCAST(ewma_policy_data_t, pol); + } +} + +/** + * Downcast a circuitmux_policy_circ_data_t to an ewma_policy_circ_data_t + * and assert if the cast is impossible. + */ + +static INLINE ewma_policy_circ_data_t * +TO_EWMA_POL_CIRC_DATA(circuitmux_policy_circ_data_t *pol) +{ + if (!pol) return NULL; + else { + tor_assert(pol->magic == EWMA_POL_CIRC_DATA_MAGIC); + return DOWNCAST(ewma_policy_circ_data_t, pol); + } +} + +/*** Static declarations for circuitmux_ewma.c ***/ + +static void add_cell_ewma(ewma_policy_data_t *pol, cell_ewma_t *ewma); +static int compare_cell_ewma_counts(const void *p1, const void *p2); +static unsigned cell_ewma_tick_from_timeval(const struct timeval *now, + double *remainder_out); +static circuit_t * cell_ewma_to_circuit(cell_ewma_t *ewma); +static INLINE double get_scale_factor(unsigned from_tick, unsigned to_tick); +static cell_ewma_t * pop_first_cell_ewma(ewma_policy_data_t *pol); +static void remove_cell_ewma(ewma_policy_data_t *pol, cell_ewma_t *ewma); +static void scale_single_cell_ewma(cell_ewma_t *ewma, unsigned cur_tick); +static void scale_active_circuits(ewma_policy_data_t *pol, + unsigned cur_tick); + +/*** Circuitmux policy methods ***/ + +static circuitmux_policy_data_t * ewma_alloc_cmux_data(circuitmux_t *cmux); +static void ewma_free_cmux_data(circuitmux_t *cmux, + circuitmux_policy_data_t *pol_data); +static circuitmux_policy_circ_data_t * +ewma_alloc_circ_data(circuitmux_t *cmux, circuitmux_policy_data_t *pol_data, + circuit_t *circ, cell_direction_t direction, + unsigned int cell_count); +static void +ewma_free_circ_data(circuitmux_t *cmux, + circuitmux_policy_data_t *pol_data, + circuit_t *circ, + circuitmux_policy_circ_data_t *pol_circ_data); +static void +ewma_notify_circ_active(circuitmux_t *cmux, + circuitmux_policy_data_t *pol_data, + circuit_t *circ, + circuitmux_policy_circ_data_t *pol_circ_data); +static void +ewma_notify_circ_inactive(circuitmux_t *cmux, + circuitmux_policy_data_t *pol_data, + circuit_t *circ, + circuitmux_policy_circ_data_t *pol_circ_data); +static void +ewma_notify_xmit_cells(circuitmux_t *cmux, + circuitmux_policy_data_t *pol_data, + circuit_t *circ, + circuitmux_policy_circ_data_t *pol_circ_data, + unsigned int n_cells); +static circuit_t * +ewma_pick_active_circuit(circuitmux_t *cmux, + circuitmux_policy_data_t *pol_data); + +/*** EWMA global variables ***/ + +/** The per-tick scale factor to be used when computing cell-count EWMA + * values. (A cell sent N ticks before the start of the current tick + * has value ewma_scale_factor ** N.) + */ +static double ewma_scale_factor = 0.1; +/* DOCDOC ewma_enabled */ +static int ewma_enabled = 0; + +/*** EWMA circuitmux_policy_t method table ***/ + +circuitmux_policy_t ewma_policy = { .alloc_cmux_data = ewma_alloc_cmux_data, + .free_cmux_data = ewma_free_cmux_data, + .alloc_circ_data = ewma_alloc_circ_data, + .free_circ_data = ewma_free_circ_data, + .notify_circ_active = ewma_notify_circ_active, + .notify_circ_inactive = ewma_notify_circ_inactive, + .notify_set_n_cells = NULL, /* EWMA doesn't need this */ + .notify_xmit_cells = ewma_notify_xmit_cells, + .pick_active_circuit = ewma_pick_active_circuit +}; + +/*** EWMA method implementations using the below EWMA helper functions ***/ + +/** + * Allocate an ewma_policy_data_t and upcast it to a circuitmux_policy_data_t; + * this is called when setting the policy on a circuitmux_t to ewma_policy. + */ + +static circuitmux_policy_data_t * +ewma_alloc_cmux_data(circuitmux_t *cmux) +{ + ewma_policy_data_t *pol = NULL; + + tor_assert(cmux); + + pol = tor_malloc_zero(sizeof(*pol)); + pol->active_circuit_pqueue = smartlist_new(); + pol->active_circuit_pqueue_last_recalibrated = cell_ewma_get_tick(); + + return TO_CMUX_POL_DATA(pol); +} + +/** + * Free an ewma_policy_data_t allocated with ewma_alloc_cmux_data() + */ + +static void +ewma_free_cmux_data(circuitmux_t *cmux, + circuitmux_policy_data_t *pol_data) +{ + ewma_policy_data_t *pol = NULL; + + tor_assert(cmux); + if (!pol_data) return; + + pol = TO_EWMA_POL_DATA(pol_data); + + smartlist_free(pol->active_circuit_pqueue); + tor_free(pol); +} + +/** + * Allocate an ewma_policy_circ_data_t and upcast it to a + * circuitmux_policy_data_t; this is called when attaching a circuit to a + * circuitmux_t with ewma_policy. + */ + +static circuitmux_policy_circ_data_t * +ewma_alloc_circ_data(circuitmux_t *cmux, + circuitmux_policy_data_t *pol_data, + circuit_t *circ, + cell_direction_t direction, + unsigned int cell_count) +{ + ewma_policy_data_t *pol = NULL; + ewma_policy_circ_data_t *cdata = NULL; + + tor_assert(cmux); + tor_assert(pol_data); + tor_assert(circ); + tor_assert(direction == CELL_DIRECTION_OUT || + direction == CELL_DIRECTION_IN); + /* Shut the compiler up */ + tor_assert(cell_count == cell_count); + + pol = TO_EWMA_POL_DATA(pol_data); + + cdata = tor_malloc_zero(sizeof(*cdata)); + cdata->circ = circ; + + /* + * Initialize the cell_ewma_t structure (formerly in + * init_circuit_base()) + */ + cdata->cell_ewma.last_adjusted_tick = cell_ewma_get_tick(); + cdata->cell_ewma.cell_count = 0.0; + cdata->cell_ewma.heap_index = -1; + if (direction == CELL_DIRECTION_IN) { + cdata->cell_ewma.is_for_p_chan = 1; + } else { + cdata->cell_ewma.is_for_p_chan = 0; + } + + return TO_CMUX_POL_CIRC_DATA(cdata); +} + +/** + * Free an ewma_policy_circ_data_t allocated with ewma_alloc_circ_data() + */ + +static void +ewma_free_circ_data(circuitmux_t *cmux, + circuitmux_policy_data_t *pol_data, + circuit_t *circ, + circuitmux_policy_circ_data_t *pol_circ_data) + +{ + ewma_policy_data_t *pol = NULL; + ewma_policy_circ_data_t *cdata = NULL; + + tor_assert(cmux); + tor_assert(circ); + tor_assert(pol_data); + pol = TO_EWMA_POL_DATA(pol_data); + + if (!pol_circ_data) return; + + cdata = TO_EWMA_POL_CIRC_DATA(pol_circ_data); + + tor_free(cdata); +} + +/** + * Handle circuit activation; this inserts the circuit's cell_ewma into + * the active_circuits_pqueue. + */ + +static void +ewma_notify_circ_active(circuitmux_t *cmux, + circuitmux_policy_data_t *pol_data, + circuit_t *circ, + circuitmux_policy_circ_data_t *pol_circ_data) +{ + ewma_policy_data_t *pol = NULL; + ewma_policy_circ_data_t *cdata = NULL; + + tor_assert(cmux); + tor_assert(pol_data); + tor_assert(circ); + tor_assert(pol_circ_data); + + pol = TO_EWMA_POL_DATA(pol_data); + cdata = TO_EWMA_POL_CIRC_DATA(pol_circ_data); + + add_cell_ewma(pol, &(cdata->cell_ewma)); +} + +/** + * Handle circuit deactivation; this removes the circuit's cell_ewma from + * the active_circuits_pqueue. + */ + +static void +ewma_notify_circ_inactive(circuitmux_t *cmux, + circuitmux_policy_data_t *pol_data, + circuit_t *circ, + circuitmux_policy_circ_data_t *pol_circ_data) +{ + ewma_policy_data_t *pol = NULL; + ewma_policy_circ_data_t *cdata = NULL; + + tor_assert(cmux); + tor_assert(pol_data); + tor_assert(circ); + tor_assert(pol_circ_data); + + pol = TO_EWMA_POL_DATA(pol_data); + cdata = TO_EWMA_POL_CIRC_DATA(pol_circ_data); + + remove_cell_ewma(pol, &(cdata->cell_ewma)); +} + +/** + * Update cell_ewma for this circuit after we've sent some cells, and + * remove/reinsert it in the queue. This used to be done (brokenly, + * see bug 6816) in channel_flush_from_first_active_circuit(). + */ + +static void +ewma_notify_xmit_cells(circuitmux_t *cmux, + circuitmux_policy_data_t *pol_data, + circuit_t *circ, + circuitmux_policy_circ_data_t *pol_circ_data, + unsigned int n_cells) +{ + ewma_policy_data_t *pol = NULL; + ewma_policy_circ_data_t *cdata = NULL; + unsigned int tick; + double fractional_tick, ewma_increment; + /* The current (hi-res) time */ + struct timeval now_hires; + cell_ewma_t *cell_ewma, *tmp; + + tor_assert(cmux); + tor_assert(pol_data); + tor_assert(circ); + tor_assert(pol_circ_data); + tor_assert(n_cells > 0); + + pol = TO_EWMA_POL_DATA(pol_data); + cdata = TO_EWMA_POL_CIRC_DATA(pol_circ_data); + + /* Rescale the EWMAs if needed */ + tor_gettimeofday_cached(&now_hires); + tick = cell_ewma_tick_from_timeval(&now_hires, &fractional_tick); + + if (tick != pol->active_circuit_pqueue_last_recalibrated) { + scale_active_circuits(pol, tick); + } + + /* How much do we adjust the cell count in cell_ewma by? */ + ewma_increment = + ((double)(n_cells)) * pow(ewma_scale_factor, -fractional_tick); + + /* Do the adjustment */ + cell_ewma = &(cdata->cell_ewma); + cell_ewma->cell_count += ewma_increment; + + /* + * Since we just sent on this circuit, it should be at the head of + * the queue. Pop the head, assert that it matches, then re-add. + */ + tmp = pop_first_cell_ewma(pol); + tor_assert(tmp == cell_ewma); + add_cell_ewma(pol, cell_ewma); +} + +/** + * Pick the preferred circuit to send from; this will be the one with + * the lowest EWMA value in the priority queue. This used to be done + * in channel_flush_from_first_active_circuit(). + */ + +static circuit_t * +ewma_pick_active_circuit(circuitmux_t *cmux, + circuitmux_policy_data_t *pol_data) +{ + ewma_policy_data_t *pol = NULL; + circuit_t *circ = NULL; + cell_ewma_t *cell_ewma = NULL; + + tor_assert(cmux); + tor_assert(pol_data); + + pol = TO_EWMA_POL_DATA(pol_data); + + if (smartlist_len(pol->active_circuit_pqueue) > 0) { + /* Get the head of the queue */ + cell_ewma = smartlist_get(pol->active_circuit_pqueue, 0); + circ = cell_ewma_to_circuit(cell_ewma); + } + + return circ; +} + +/** Helper for sorting cell_ewma_t values in their priority queue. */ +static int +compare_cell_ewma_counts(const void *p1, const void *p2) +{ + const cell_ewma_t *e1 = p1, *e2 = p2; + + if (e1->cell_count < e2->cell_count) + return -1; + else if (e1->cell_count > e2->cell_count) + return 1; + else + return 0; +} + +/** Given a cell_ewma_t, return a pointer to the circuit containing it. */ +static circuit_t * +cell_ewma_to_circuit(cell_ewma_t *ewma) +{ + ewma_policy_circ_data_t *cdata = NULL; + + tor_assert(ewma); + cdata = SUBTYPE_P(ewma, ewma_policy_circ_data_t, cell_ewma); + tor_assert(cdata); + + return cdata->circ; +} + +/* ==== Functions for scaling cell_ewma_t ==== + + When choosing which cells to relay first, we favor circuits that have been + quiet recently. This gives better latency on connections that aren't + pushing lots of data, and makes the network feel more interactive. + + Conceptually, we take an exponentially weighted mean average of the number + of cells a circuit has sent, and allow active circuits (those with cells to + relay) to send cells in reverse order of their exponentially-weighted mean + average (EWMA) cell count. [That is, a cell sent N seconds ago 'counts' + F^N times as much as a cell sent now, for 0<F<1.0, and we favor the + circuit that has sent the fewest cells] + + If 'double' had infinite precision, we could do this simply by counting a + cell sent at startup as having weight 1.0, and a cell sent N seconds later + as having weight F^-N. This way, we would never need to re-scale + any already-sent cells. + + To prevent double from overflowing, we could count a cell sent now as + having weight 1.0 and a cell sent N seconds ago as having weight F^N. + This, however, would mean we'd need to re-scale *ALL* old circuits every + time we wanted to send a cell. + + So as a compromise, we divide time into 'ticks' (currently, 10-second + increments) and say that a cell sent at the start of a current tick is + worth 1.0, a cell sent N seconds before the start of the current tick is + worth F^N, and a cell sent N seconds after the start of the current tick is + worth F^-N. This way we don't overflow, and we don't need to constantly + rescale. + */ + +/** Given a timeval now, compute the cell_ewma tick in which it occurs + * and the fraction of the tick that has elapsed between the start of the tick + * and now. Return the former and store the latter in + * *remainder_out. + * + * These tick values are not meant to be shared between Tor instances, or used + * for other purposes. */ +static unsigned +cell_ewma_tick_from_timeval(const struct timeval *now, + double *remainder_out) +{ + unsigned res = (unsigned) (now->tv_sec / EWMA_TICK_LEN); + /* rem */ + double rem = (now->tv_sec % EWMA_TICK_LEN) + + ((double)(now->tv_usec)) / 1.0e6; + *remainder_out = rem / EWMA_TICK_LEN; + return res; +} + +/** Compute and return the current cell_ewma tick. */ +unsigned int +cell_ewma_get_tick(void) +{ + return ((unsigned)approx_time() / EWMA_TICK_LEN); +} + +/** Adjust the global cell scale factor based on options */ +void +cell_ewma_set_scale_factor(const or_options_t *options, + const networkstatus_t *consensus) +{ + int32_t halflife_ms; + double halflife; + const char *source; + if (options && options->CircuitPriorityHalflife >= -EPSILON) { + halflife = options->CircuitPriorityHalflife; + source = "CircuitPriorityHalflife in configuration"; + } else if (consensus && (halflife_ms = networkstatus_get_param( + consensus, "CircuitPriorityHalflifeMsec", + -1, -1, INT32_MAX)) >= 0) { + halflife = ((double)halflife_ms)/1000.0; + source = "CircuitPriorityHalflifeMsec in consensus"; + } else { + halflife = EWMA_DEFAULT_HALFLIFE; + source = "Default value"; + } + + if (halflife <= EPSILON) { + /* The cell EWMA algorithm is disabled. */ + ewma_scale_factor = 0.1; + ewma_enabled = 0; + log_info(LD_OR, + "Disabled cell_ewma algorithm because of value in %s", + source); + } else { + /* convert halflife into halflife-per-tick. */ + halflife /= EWMA_TICK_LEN; + /* compute per-tick scale factor. */ + ewma_scale_factor = exp( LOG_ONEHALF / halflife ); + ewma_enabled = 1; + log_info(LD_OR, + "Enabled cell_ewma algorithm because of value in %s; " + "scale factor is %f per %d seconds", + source, ewma_scale_factor, EWMA_TICK_LEN); + } +} + +/** Return the multiplier necessary to convert the value of a cell sent in + * 'from_tick' to one sent in 'to_tick'. */ +static INLINE double +get_scale_factor(unsigned from_tick, unsigned to_tick) +{ + /* This math can wrap around, but that's okay: unsigned overflow is + well-defined */ + int diff = (int)(to_tick - from_tick); + return pow(ewma_scale_factor, diff); +} + +/** Adjust the cell count of ewma so that it is scaled with respect to + * cur_tick */ +static void +scale_single_cell_ewma(cell_ewma_t *ewma, unsigned cur_tick) +{ + double factor = get_scale_factor(ewma->last_adjusted_tick, cur_tick); + ewma->cell_count *= factor; + ewma->last_adjusted_tick = cur_tick; +} + +/** Adjust the cell count of every active circuit on chan so + * that they are scaled with respect to cur_tick */ +static void +scale_active_circuits(ewma_policy_data_t *pol, unsigned cur_tick) +{ + double factor; + + tor_assert(pol); + tor_assert(pol->active_circuit_pqueue); + + factor = + get_scale_factor( + pol->active_circuit_pqueue_last_recalibrated, + cur_tick); + /** Ordinarily it isn't okay to change the value of an element in a heap, + * but it's okay here, since we are preserving the order. */ + SMARTLIST_FOREACH_BEGIN( + pol->active_circuit_pqueue, + cell_ewma_t *, e) { + tor_assert(e->last_adjusted_tick == + pol->active_circuit_pqueue_last_recalibrated); + e->cell_count *= factor; + e->last_adjusted_tick = cur_tick; + } SMARTLIST_FOREACH_END(e); + pol->active_circuit_pqueue_last_recalibrated = cur_tick; +} + +/** Rescale ewma to the same scale as pol, and add it to + * pol's priority queue of active circuits */ +static void +add_cell_ewma(ewma_policy_data_t *pol, cell_ewma_t *ewma) +{ + tor_assert(pol); + tor_assert(pol->active_circuit_pqueue); + tor_assert(ewma); + tor_assert(ewma->heap_index == -1); + + scale_single_cell_ewma( + ewma, + pol->active_circuit_pqueue_last_recalibrated); + + smartlist_pqueue_add(pol->active_circuit_pqueue, + compare_cell_ewma_counts, + STRUCT_OFFSET(cell_ewma_t, heap_index), + ewma); +} + +/** Remove ewma from pol's priority queue of active circuits */ +static void +remove_cell_ewma(ewma_policy_data_t *pol, cell_ewma_t *ewma) +{ + tor_assert(pol); + tor_assert(pol->active_circuit_pqueue); + tor_assert(ewma); + tor_assert(ewma->heap_index != -1); + + smartlist_pqueue_remove(pol->active_circuit_pqueue, + compare_cell_ewma_counts, + STRUCT_OFFSET(cell_ewma_t, heap_index), + ewma); +} + +/** Remove and return the first cell_ewma_t from pol's priority queue of + * active circuits. Requires that the priority queue is nonempty. */ +static cell_ewma_t * +pop_first_cell_ewma(ewma_policy_data_t *pol) +{ + tor_assert(pol); + tor_assert(pol->active_circuit_pqueue); + + return smartlist_pqueue_pop(pol->active_circuit_pqueue, + compare_cell_ewma_counts, + STRUCT_OFFSET(cell_ewma_t, heap_index)); +} diff --git a/src/or/circuitmux_ewma.h b/src/or/circuitmux_ewma.h index fcbe298..0968461 100644 --- a/src/or/circuitmux_ewma.h +++ b/src/or/circuitmux_ewma.h @@ -12,7 +12,17 @@ #include "or.h" #include "circuitmux.h" -/* TODO */ +/* Everything but circuitmux_ewma.c should see this extern */ +#ifndef _TOR_CIRCUITMUX_EWMA_C + +extern circuitmux_policy_t ewma_policy; + +#endif /* !(_TOR_CIRCUITMUX_EWMA_C) */ + +/* Externally visible EWMA functions */ +unsigned int cell_ewma_get_tick(void); +void cell_ewma_set_scale_factor(const or_options_t *options, + const networkstatus_t *consensus); #endif /* _TOR_CIRCUITMUX_EWMA_H */

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[tor/master] Remove EWMA code from relay.{c,h}; it goes to a circuitmux policy now
by andrea＠torproject.org 11 Oct '12

11 Oct '12

commit 14fe0d585916f4d8fdba64b419778c47ffd64b16 Author: Andrea Shepard <andrea(a)torproject.org> Date: Mon Oct 1 01:51:31 2012 -0700 Remove EWMA code from relay.{c,h}; it goes to a circuitmux policy now --- src/or/relay.c | 332 -------------------------------------------------------- src/or/relay.h | 3 - 2 files changed, 0 insertions(+), 335 deletions(-) diff --git a/src/or/relay.c b/src/or/relay.c index e3b383b..d034162 100644 --- a/src/or/relay.c +++ b/src/or/relay.c @@ -10,7 +10,6 @@ * receiving from circuits, plus queuing on circuits. **/ -#include <math.h> #define RELAY_PRIVATE #include "or.h" #include "buffers.h" @@ -1972,245 +1971,6 @@ cell_queue_pop(cell_queue_t *queue) return cell; } -#if 0 -/** Helper for sorting cell_ewma_t values in their priority queue. */ -static int -compare_cell_ewma_counts(const void *p1, const void *p2) -{ - const cell_ewma_t *e1=p1, *e2=p2; - if (e1->cell_count < e2->cell_count) - return -1; - else if (e1->cell_count > e2->cell_count) - return 1; - else - return 0; -} - -/** Given a cell_ewma_t, return a pointer to the circuit containing it. */ -static circuit_t * -cell_ewma_to_circuit(cell_ewma_t *ewma) -{ - if (ewma->is_for_p_chan) { - /* This is an or_circuit_t's p_cell_ewma. */ - or_circuit_t *orcirc = SUBTYPE_P(ewma, or_circuit_t, p_cell_ewma); - return TO_CIRCUIT(orcirc); - } else { - /* This is some circuit's n_cell_ewma. */ - return SUBTYPE_P(ewma, circuit_t, n_cell_ewma); - } -} - -/* ==== Functions for scaling cell_ewma_t ==== - - When choosing which cells to relay first, we favor circuits that have been - quiet recently. This gives better latency on connections that aren't - pushing lots of data, and makes the network feel more interactive. - - Conceptually, we take an exponentially weighted mean average of the number - of cells a circuit has sent, and allow active circuits (those with cells to - relay) to send cells in reverse order of their exponentially-weighted mean - average (EWMA) cell count. [That is, a cell sent N seconds ago 'counts' - F^N times as much as a cell sent now, for 0<F<1.0, and we favor the - circuit that has sent the fewest cells] - - If 'double' had infinite precision, we could do this simply by counting a - cell sent at startup as having weight 1.0, and a cell sent N seconds later - as having weight F^-N. This way, we would never need to re-scale - any already-sent cells. - - To prevent double from overflowing, we could count a cell sent now as - having weight 1.0 and a cell sent N seconds ago as having weight F^N. - This, however, would mean we'd need to re-scale *ALL* old circuits every - time we wanted to send a cell. - - So as a compromise, we divide time into 'ticks' (currently, 10-second - increments) and say that a cell sent at the start of a current tick is - worth 1.0, a cell sent N seconds before the start of the current tick is - worth F^N, and a cell sent N seconds after the start of the current tick is - worth F^-N. This way we don't overflow, and we don't need to constantly - rescale. - */ - -/** How long does a tick last (seconds)? */ -#define EWMA_TICK_LEN 10 - -/** The default per-tick scale factor, if it hasn't been overridden by a - * consensus or a configuration setting. zero means "disabled". */ -#define EWMA_DEFAULT_HALFLIFE 0.0 - -/** Given a timeval now, compute the cell_ewma tick in which it occurs - * and the fraction of the tick that has elapsed between the start of the tick - * and now. Return the former and store the latter in - * *remainder_out. - * - * These tick values are not meant to be shared between Tor instances, or used - * for other purposes. */ -static unsigned -cell_ewma_tick_from_timeval(const struct timeval *now, - double *remainder_out) -{ - unsigned res = (unsigned) (now->tv_sec / EWMA_TICK_LEN); - /* rem */ - double rem = (now->tv_sec % EWMA_TICK_LEN) + - ((double)(now->tv_usec)) / 1.0e6; - *remainder_out = rem / EWMA_TICK_LEN; - return res; -} - -/** Compute and return the current cell_ewma tick. */ -unsigned -cell_ewma_get_tick(void) -{ - return ((unsigned)approx_time() / EWMA_TICK_LEN); -} - -/** The per-tick scale factor to be used when computing cell-count EWMA - * values. (A cell sent N ticks before the start of the current tick - * has value ewma_scale_factor ** N.) - */ -static double ewma_scale_factor = 0.1; -/* DOCDOC ewma_enabled */ -static int ewma_enabled = 0; - -/*DOCDOC*/ -#define EPSILON 0.00001 -/*DOCDOC*/ -#define LOG_ONEHALF -0.69314718055994529 - -/** Adjust the global cell scale factor based on options */ -void -cell_ewma_set_scale_factor(const or_options_t *options, - const networkstatus_t *consensus) -{ - int32_t halflife_ms; - double halflife; - const char *source; - if (options && options->CircuitPriorityHalflife >= -EPSILON) { - halflife = options->CircuitPriorityHalflife; - source = "CircuitPriorityHalflife in configuration"; - } else if (consensus && (halflife_ms = networkstatus_get_param( - consensus, "CircuitPriorityHalflifeMsec", - -1, -1, INT32_MAX)) >= 0) { - halflife = ((double)halflife_ms)/1000.0; - source = "CircuitPriorityHalflifeMsec in consensus"; - } else { - halflife = EWMA_DEFAULT_HALFLIFE; - source = "Default value"; - } - - if (halflife <= EPSILON) { - /* The cell EWMA algorithm is disabled. */ - ewma_scale_factor = 0.1; - ewma_enabled = 0; - log_info(LD_OR, - "Disabled cell_ewma algorithm because of value in %s", - source); - } else { - /* convert halflife into halflife-per-tick. */ - halflife /= EWMA_TICK_LEN; - /* compute per-tick scale factor. */ - ewma_scale_factor = exp( LOG_ONEHALF / halflife ); - ewma_enabled = 1; - log_info(LD_OR, - "Enabled cell_ewma algorithm because of value in %s; " - "scale factor is %f per %d seconds", - source, ewma_scale_factor, EWMA_TICK_LEN); - } -} - -/** Return the multiplier necessary to convert the value of a cell sent in - * 'from_tick' to one sent in 'to_tick'. */ -static INLINE double -get_scale_factor(unsigned from_tick, unsigned to_tick) -{ - /* This math can wrap around, but that's okay: unsigned overflow is - well-defined */ - int diff = (int)(to_tick - from_tick); - return pow(ewma_scale_factor, diff); -} - -/** Adjust the cell count of ewma so that it is scaled with respect to - * cur_tick */ -static void -scale_single_cell_ewma(cell_ewma_t *ewma, unsigned cur_tick) -{ - double factor = get_scale_factor(ewma->last_adjusted_tick, cur_tick); - ewma->cell_count *= factor; - ewma->last_adjusted_tick = cur_tick; -} - -/** Adjust the cell count of every active circuit on chan so - * that they are scaled with respect to cur_tick */ -static void -scale_active_circuits(channel_t *chan, unsigned cur_tick) -{ - double factor; - - tor_assert(chan); - - factor = - get_scale_factor( - chan->active_circuit_pqueue_last_recalibrated, - cur_tick); - /** Ordinarily it isn't okay to change the value of an element in a heap, - * but it's okay here, since we are preserving the order. */ - SMARTLIST_FOREACH_BEGIN( - chan->active_circuit_pqueue, - cell_ewma_t *, e) { - tor_assert(e->last_adjusted_tick == - chan->active_circuit_pqueue_last_recalibrated); - e->cell_count *= factor; - e->last_adjusted_tick = cur_tick; - } SMARTLIST_FOREACH_END(e); - chan->active_circuit_pqueue_last_recalibrated = cur_tick; -} - -/** Rescale ewma to the same scale as chan, and add it to - * chan's priority queue of active circuits */ -static void -add_cell_ewma_to_chan(channel_t *chan, cell_ewma_t *ewma) -{ - tor_assert(chan); - tor_assert(ewma); - tor_assert(ewma->heap_index == -1); - - scale_single_cell_ewma( - ewma, - chan->active_circuit_pqueue_last_recalibrated); - - smartlist_pqueue_add(chan->active_circuit_pqueue, - compare_cell_ewma_counts, - STRUCT_OFFSET(cell_ewma_t, heap_index), - ewma); -} - -/** Remove ewma from chan's priority queue of active circuits */ -static void -remove_cell_ewma_from_chan(channel_t *chan, cell_ewma_t *ewma) -{ - tor_assert(chan); - tor_assert(ewma); - tor_assert(ewma->heap_index != -1); - - smartlist_pqueue_remove(chan->active_circuit_pqueue, - compare_cell_ewma_counts, - STRUCT_OFFSET(cell_ewma_t, heap_index), - ewma); -} - -/** Remove and return the first cell_ewma_t from chan's priority queue of - * active circuits. Requires that the priority queue is nonempty. */ -static cell_ewma_t * -pop_first_cell_ewma_from_chan(channel_t *chan) -{ - tor_assert(chan); - - return smartlist_pqueue_pop(chan->active_circuit_pqueue, - compare_cell_ewma_counts, - STRUCT_OFFSET(cell_ewma_t, heap_index)); -} -#endif - /** * Update the number of cells available on the circuit's n_chan or p_chan's * circuit mux. @@ -2335,15 +2095,6 @@ channel_flush_from_first_active_circuit(channel_t *chan, int max) int streams_blocked; packed_cell_t *cell; -#if 0 - /* The current (hi-res) time */ - struct timeval now_hires; - - /* The EWMA cell counter for the circuit we're flushing. */ - cell_ewma_t *cell_ewma = NULL; - double ewma_increment = -1; -#endif - /* Get the cmux */ tor_assert(chan); tor_assert(chan->cmux); @@ -2356,26 +2107,6 @@ channel_flush_from_first_active_circuit(channel_t *chan, int max) if (!circ) break; assert_cmux_ok_paranoid(chan); -#if 0 - /* This will go in circuitmux_get_first_active_circuit() */ - /* See if we're doing the ewma circuit selection algorithm. */ - if (ewma_enabled) { - unsigned tick; - double fractional_tick; - tor_gettimeofday_cached(&now_hires); - tick = cell_ewma_tick_from_timeval(&now_hires, &fractional_tick); - - if (tick != chan->active_circuit_pqueue_last_recalibrated) { - scale_active_circuits(chan, tick); - } - - ewma_increment = pow(ewma_scale_factor, -fractional_tick); - - cell_ewma = smartlist_get(chan->active_circuit_pqueue, 0); - circ = cell_ewma_to_circuit(cell_ewma); - } -#endif - if (circ->n_chan == chan) { queue = &circ->n_chan_cells; streams_blocked = circ->streams_blocked_on_n_chan; @@ -2460,28 +2191,6 @@ channel_flush_from_first_active_circuit(channel_t *chan, int max) if (streams_blocked && queue->n <= CELL_QUEUE_LOWWATER_SIZE) set_streams_blocked_on_circ(circ, chan, 0, 0); /* unblock streams */ -#if 0 - if (cell_ewma) { - cell_ewma_t *tmp; - cell_ewma->cell_count += ewma_increment; - /* We pop and re-add the cell_ewma_t here, not above, since we need to - * re-add it immediately to keep the priority queue consistent with - * the linked-list implementation */ - tmp = pop_first_cell_ewma_from_chan(chan); - tor_assert(tmp == cell_ewma); - add_cell_ewma_to_chan(chan, cell_ewma); - } - if (!ewma_enabled && circ != chan->active_circuits) { - /* If this happens, the current circuit just got made inactive by - * a call in connection_write_to_buf(). That's nothing to worry about: - * circuit_make_inactive_on_conn() already advanced chan->active_circuits - * for us. - */ - assert_active_circuits_ok_paranoid(chan); - goto done; - } -#endif - /* If n_flushed < max still, loop around and pick another circuit */ } @@ -2636,47 +2345,6 @@ assert_circuit_mux_okay(channel_t *chan) circuitmux_assert_okay(chan->cmux); } -#if 0 -/** Fail with an assert if the active circuits ring on orconn is - * corrupt. */ -void -assert_active_circuits_ok(channel_t *chan) -{ - circuit_t *head = NULL, *cur = NULL; - int n = 0; - - tor_assert(chan); - - cur = head = chan->active_circuits; - - if (! head) - return; - do { - circuit_t *next = *next_circ_on_chan_p(cur, chan); - circuit_t *prev = *prev_circ_on_chan_p(cur, chan); - cell_ewma_t *ewma; - tor_assert(next); - tor_assert(prev); - tor_assert(*next_circ_on_chan_p(prev, chan) == cur); - tor_assert(*prev_circ_on_chan_p(next, chan) == cur); - if (chan == cur->n_chan) { - ewma = &cur->n_cell_ewma; - tor_assert(!ewma->is_for_p_chan); - } else { - ewma = &TO_OR_CIRCUIT(cur)->p_cell_ewma; - tor_assert(ewma->is_for_p_chan); - } - tor_assert(ewma->heap_index != -1); - tor_assert(ewma == smartlist_get(chan->active_circuit_pqueue, - ewma->heap_index)); - n++; - cur = next; - } while (cur != head); - - tor_assert(n == smartlist_len(chan->active_circuit_pqueue)); -} -#endif - /** Return 1 if we shouldn't restart reading on this circuit, even if * we get a SENDME. Else return 0. */ diff --git a/src/or/relay.h b/src/or/relay.h index ef5074b..5759c51 100644 --- a/src/or/relay.h +++ b/src/or/relay.h @@ -60,9 +60,6 @@ int append_address_to_payload(uint8_t *payload_out, const tor_addr_t *addr); const uint8_t *decode_address_from_payload(tor_addr_t *addr_out, const uint8_t *payload, int payload_len); -unsigned cell_ewma_get_tick(void); -void cell_ewma_set_scale_factor(const or_options_t *options, - const networkstatus_t *consensus); void circuit_clear_cell_queue(circuit_t *circ, channel_t *chan); #ifdef RELAY_PRIVATE

1 0

[tor/master] Remove ewma setup code in init_circuit_base()/or_circuit_new() of circuitlist.c; it gets allocated when the circuit is attached to a circuitmux_t with that policy now
by andrea＠torproject.org 11 Oct '12

11 Oct '12

commit b7d5784c542f180c0fe7dc6ba999415cdbef3abe Author: Andrea Shepard <andrea(a)torproject.org> Date: Mon Oct 1 01:50:05 2012 -0700 Remove ewma setup code in init_circuit_base()/or_circuit_new() of circuitlist.c; it gets allocated when the circuit is attached to a circuitmux_t with that policy now --- src/or/circuitlist.c | 16 ---------------- 1 files changed, 0 insertions(+), 16 deletions(-) diff --git a/src/or/circuitlist.c b/src/or/circuitlist.c index bec3dc8..cfef0aa 100644 --- a/src/or/circuitlist.c +++ b/src/or/circuitlist.c @@ -546,12 +546,6 @@ init_circuit_base(circuit_t *circ) circ->package_window = circuit_initial_package_window(); circ->deliver_window = CIRCWINDOW_START; - /* Initialize the cell_ewma_t structure */ - circ->n_cell_ewma.last_adjusted_tick = cell_ewma_get_tick(); - circ->n_cell_ewma.cell_count = 0.0; - circ->n_cell_ewma.heap_index = -1; - circ->n_cell_ewma.is_for_p_chan = 0; - circuit_add(circ); } @@ -599,16 +593,6 @@ or_circuit_new(circid_t p_circ_id, channel_t *p_chan) init_circuit_base(TO_CIRCUIT(circ)); - /* Initialize the cell_ewma_t structure */ - - /* Initialize the cell counts to 0 */ - circ->p_cell_ewma.cell_count = 0.0; - circ->p_cell_ewma.last_adjusted_tick = cell_ewma_get_tick(); - circ->p_cell_ewma.is_for_p_chan = 1; - - /* It's not in any heap yet. */ - circ->p_cell_ewma.heap_index = -1; - return circ; }

1 0

[tor/master] Add circuitmux.h, circuitmux_ewma.h includes now necessary in networkstatus.c
by andrea＠torproject.org 11 Oct '12

11 Oct '12

commit 0af2eab9a2698e6a50aec4238fc529f152b77a89 Author: Andrea Shepard <andrea(a)torproject.org> Date: Mon Oct 1 01:53:59 2012 -0700 Add circuitmux.h, circuitmux_ewma.h includes now necessary in networkstatus.c --- src/or/networkstatus.c | 2 ++ 1 files changed, 2 insertions(+), 0 deletions(-) diff --git a/src/or/networkstatus.c b/src/or/networkstatus.c index 0cc6a21..619099b 100644 --- a/src/or/networkstatus.c +++ b/src/or/networkstatus.c @@ -12,6 +12,8 @@ #include "or.h" #include "circuitbuild.h" +#include "circuitmux.h" +#include "circuitmux_ewma.h" #include "config.h" #include "connection.h" #include "connection_or.h"

1 0

[tor/master] Remove cell_ewma_t from or.h and from circuit_t/or_circuit_t; all that goes to the new circuitmux_ewma.c now
by andrea＠torproject.org 11 Oct '12

11 Oct '12

commit d194b8602ae0bcf6ffe711903b110193bdbcbab4 Author: Andrea Shepard <andrea(a)torproject.org> Date: Mon Oct 1 01:53:24 2012 -0700 Remove cell_ewma_t from or.h and from circuit_t/or_circuit_t; all that goes to the new circuitmux_ewma.c now --- src/or/or.h | 36 ------------------------------------ 1 files changed, 0 insertions(+), 36 deletions(-) diff --git a/src/or/or.h b/src/or/or.h index a0fcf8f..dad81ed 100644 --- a/src/or/or.h +++ b/src/or/or.h @@ -2581,29 +2581,6 @@ typedef struct { time_t expiry_time; } cpath_build_state_t; -/** - * The cell_ewma_t structure keeps track of how many cells a circuit has - * transferred recently. It keeps an EWMA (exponentially weighted moving - * average) of the number of cells flushed from the circuit queue onto a - * connection in connection_or_flush_from_first_active_circuit(). - */ -typedef struct { - /** The last 'tick' at which we recalibrated cell_count. - * - * A cell sent at exactly the start of this tick has weight 1.0. Cells sent - * since the start of this tick have weight greater than 1.0; ones sent - * earlier have less weight. */ - unsigned last_adjusted_tick; - /** The EWMA of the cell count. */ - double cell_count; - /** True iff this is the cell count for a circuit's previous - * channel. */ - unsigned int is_for_p_chan : 1; - /** The position of the circuit within the OR connection's priority - * queue. */ - int heap_index; -} cell_ewma_t; - #define ORIGIN_CIRCUIT_MAGIC 0x35315243u #define OR_CIRCUIT_MAGIC 0x98ABC04Fu @@ -2721,12 +2698,8 @@ typedef struct circuit_t { /** Unique ID for measuring tunneled network status requests. */ uint64_t dirreq_id; - /** TODO is this *all* circuits or all circuits on n_chan? */ struct circuit_t *next; /**< Next circuit in linked list of all circuits. */ - /** TODO all this from here on down should go away in favor of - * circuitmux_t. - */ /** Next circuit in the doubly-linked ring of circuits waiting to add * cells to n_conn. NULL if we have no cells pending, or if we're not * linked to an OR connection. */ @@ -2735,11 +2708,6 @@ typedef struct circuit_t { * cells to n_conn. NULL if we have no cells pending, or if we're not * linked to an OR connection. */ struct circuit_t *prev_active_on_n_chan; - - /** The EWMA count for the number of cells flushed from the - * n_chan_cells queue. Used to determine which circuit to flush from next. - */ - cell_ewma_t n_cell_ewma; } circuit_t; /** Largest number of relay_early cells that we can send on a given @@ -2977,10 +2945,6 @@ typedef struct or_circuit_t { * exit-ward queues of this circuit; reset every time when writing * buffer stats to disk. */ uint64_t total_cell_waiting_time; - - /** The EWMA count for the number of cells flushed from the - * p_conn_cells queue. */ - cell_ewma_t p_cell_ewma; } or_circuit_t; /** Convert a circuit subtype to a circuit_t. */

1 0

[tor/master] Fix make check-spaces in circuitbuild.c and router.h
by andrea＠torproject.org 11 Oct '12

11 Oct '12

commit 7f952da55334d3a3693d1c6e8531fd96730265db Author: Andrea Shepard <andrea(a)persephoneslair.org> Date: Wed Aug 1 02:38:43 2012 -0700 Fix make check-spaces in circuitbuild.c and router.h --- src/or/router.h | 11 ++++++++--- 1 files changed, 8 insertions(+), 3 deletions(-) diff --git a/src/or/router.h b/src/or/router.h index c43c308..3964085 100644 --- a/src/or/router.h +++ b/src/or/router.h @@ -86,13 +86,18 @@ int router_pick_published_address(const or_options_t *options, uint32_t *addr); int router_rebuild_descriptor(int force); int router_dump_router_to_string(char *s, size_t maxlen, routerinfo_t *router, crypto_pk_t *ident_key); -int extrainfo_dump_to_string(char **s, extrainfo_t *extrainfo, - crypto_pk_t *ident_key); void router_get_prim_orport(const routerinfo_t *router, - tor_addr_port_t *ap_out); + tor_addr_port_t *addr_port_out); +void router_get_pref_orport(const routerinfo_t *router, + tor_addr_port_t *addr_port_out); +void router_get_pref_ipv6_orport(const routerinfo_t *router, + tor_addr_port_t *addr_port_out); +int router_ipv6_preferred(const routerinfo_t *router); int router_has_addr(const routerinfo_t *router, const tor_addr_t *addr); int router_has_orport(const routerinfo_t *router, const tor_addr_port_t *orport); +int extrainfo_dump_to_string(char **s, extrainfo_t *extrainfo, + crypto_pk_t *ident_key); int is_legal_nickname(const char *s); int is_legal_nickname_or_hexdigest(const char *s); int is_legal_hexdigest(const char *s);

1 0

[tor/master] Add channel.c/channel.h for bug 6465
by andrea＠torproject.org 11 Oct '12

11 Oct '12

commit 838743654c1bed2bfe22789ff53a1993c005f176 Author: Andrea Shepard <andrea(a)persephoneslair.org> Date: Mon Jul 30 21:49:39 2012 -0700 Add channel.c/channel.h for bug 6465 Note: this is a squashed commit; see branch bug6465_rebased_v2 of user/andrea/tor.git for full history of the following 90 commits: Add channel.c/channel.h for bug 6465 Fix make check-spaces in new channel.c/channel.h Make sure new channel.h is in nodist_HEADERS and Makefile.nmake is up to date too Add channel_state_t and state utility functions Add channel_change_state() Better comments in channel.h Add CHANNEL_STATE_LISTENING for channel_t Fix wide line in channel.c Add structures/prototypes for incoming cell handling Implement channel_queue_cell() and channel_queue_var_cell() Implement channel_process_cells() Fix asserts in channel_queue_cell() and channel_queue_var_cell() Add descriptive comments for channel_queue_cell() and channel_queue_var_cell() Implement channel cell handler getters/setters Queue outgoing writes when not in writeable state Drain queues and test assertions when changing channel_t state Add log_debug() messages for channel_t stuff Add log_debug() messages for channel_t stuff Add some channel_t metadata Add time_t client_used to channel_t Add channel_touched_by_client() Declare a few channel_t metadata queries we'll have to implement later for use by circuitbuild.c Add next_circ_id/circ_id_type to channel_t for use by circuitbuild.c Count n_circuits in channel_t Channel timestamp calls Add create timestamp for channel.h Declare some new metadata queries on channel_t Add get_real_remote_descr() prototype Move active_circuits stuff to channel_t, some other or.h and channel.h changes Make channel_t refcounted and use global lists of active channels Update channel_request_close() and channel_change_state() for channel_t registration mechanism Handle closing channels sensibly Add global_identifier for channels, channel_init() internal use function Add timestamp_last_added_nonpadding to channel_t Better comments in channel_init() Correctly handle next_circ_id in channel_init() Correctly handle next_circ_id in channel_init() and even compile this time Appease make check-spaces Update timestamps when writing cells to channel_t Add channel_flush_some_cells() to call channel_flush_from_first_active_circuit() Add registered channel lookup functions Get rid of client_used in or_connection_t; it's in channel_t now Get rid of circ_id_type in or_connection_t; implement channel_set_circ_id_type() Eliminate is_bad_for_new_circs in or_connection_t; implement getter/setter for it in channel_t Eliminate next_circ_id in or_connection_t in favor of channel_t Handle packed cells in channel_t for relay.c Add channel_identity_map and related functions Handle add/remove from channel identity map on state transitions Implement channel_is_local() and channel_mark_local() Implement channel_is_client() and channel_mark_client() Implement channel_is_outgoing() and channel_mark_outgoing() Eliminate declaration for redundant channel_nonopen_was_started_here() Add channel timestamps Add channel timestamps, fix some make-check-spaces complaints Remove redundant channel_was_started_here() function and initiated_remotely bit Rename channel_get_remote_descr()/channel_get_real_remote_descr() to something clearer in channel.h Replace channel_get_write_queue_len() with sufficient and easier to implement channel_has_queued_writes() in channel.h Change return type of channel_is_bad_for_new_circs() to int for consistency Implement channel_has_queued_writes() Rename channel_touched_by_client() and client_used field for consistency with other timestamps in channel.{c,h} Implement channel_get_actual_remote_descr() and channel_get_canonical_remote_descr() in channel.{c,h} Implement channel_matches_extend_info() in channel.{c,h} Implement channel_get_for_extend() and channel_is_better() in channel.{c,h} Make channel_is_better() public in channel.{c,h} Implement channel_matches_target_addr_for_extend() in channel.{c,h} Implement channel_is_canonical_is_reliable() in channel.{c,h} Demoronize get_remote_descr() method prototype - what the hell was I thinking there? Timestamp channels in the right places in channel.c Add missing tor_assert() in channel.c Check if the lower layer accepted a cell in channel_write_cell() et al. of channel.c Implement channel_flush_cells() in channel.c (w00t, it builds at last) Call channel_timestamp_drained() at the right places in channel.c Implement channel_run_cleanup() Support optional channel_get_remote_addr() method and use it for GeoIP in channel_do_open_actions() Get rid of channel refcounting; it'll be too complicated to handle it properly with all the pointers from circuits to channels, and closing from channel_run_cleanup() will work okay just like with connections Doxygenate channel.c Appease make check-spaces in channel.c Fix superfluous semicolons in channel.c Add/remove channels from identity digest map in all the right places in channel.c The cell queues on channel_t must be empty when going to a CLOSED or ERROR state Appease make check-spaces in channel.c Add channel_clear/set_identity_digest() and some better logging to channel.{c,h} Fix better logging to channel.c Avoid SIGSEGV testing for queue emptiness in channel_flush_some_cells_from_outgoing_queue() Remove TODO about checking cell queue in channel_free(); no need for it Appease make check-spaces in channel.c Add channel_free_all() and support functions Check nullness of active_circuit_pqueue in channel_free() Fix SMARTLIST_FOREACH_END usage in channel_process_cells() Rearrange channel_t struct to use a union distinguishing listener from cell-bearing channels in channel.{c,h} --- src/common/torlog.h | 4 +- src/or/Makefile.nmake | 8 +- src/or/channel.c | 3420 +++++++++++++++++++++++++++++++++++++++++++++++++ src/or/channel.h | 399 ++++++ src/or/include.am | 2 + src/or/or.h | 128 ++- 6 files changed, 3924 insertions(+), 37 deletions(-) diff --git a/src/common/torlog.h b/src/common/torlog.h index 28890a4..fd34db1 100644 --- a/src/common/torlog.h +++ b/src/common/torlog.h @@ -94,8 +94,10 @@ #define LD_HANDSHAKE (1u<<19) /** Heartbeat messages */ #define LD_HEARTBEAT (1u<<20) +/** Abstract channel_t code */ +#define LD_CHANNEL (1u<<21) /** Number of logging domains in the code. */ -#define N_LOGGING_DOMAINS 21 +#define N_LOGGING_DOMAINS 22 /** This log message is not safe to send to a callback-based logger * immediately. Used as a flag, not a log domain. */ diff --git a/src/or/Makefile.nmake b/src/or/Makefile.nmake index 3181e79..5915364 100644 --- a/src/or/Makefile.nmake +++ b/src/or/Makefile.nmake @@ -8,10 +8,10 @@ LIBS = ..\..\..\build-alpha\lib\libevent.a \ ..\..\..\build-alpha\lib\libz.a \ ws2_32.lib advapi32.lib shell32.lib -LIBTOR_OBJECTS = buffers.obj circuitbuild.obj circuitlist.obj circuituse.obj \ - command.obj config.obj connection.obj connection_edge.obj \ - connection_or.obj control.obj cpuworker.obj directory.obj \ - dirserv.obj dirvote.obj dns.obj dnsserv.obj geoip.obj \ +LIBTOR_OBJECTS = buffers.obj channel.obj circuitbuild.obj \ + circuitlist.obj circuituse.obj command.obj config.obj connection.obj + connection_edge.obj connection_or.obj control.obj cpuworker.obj \ + directory.obj dirserv.obj dirvote.obj dns.obj dnsserv.obj geoip.obj \ hibernate.obj main.obj microdesc.obj networkstatus.obj \ nodelist.obj onion.obj policies.obj reasons.obj relay.obj \ rendclient.obj rendcommon.obj rendmid.obj rendservice.obj \ diff --git a/src/or/channel.c b/src/or/channel.c new file mode 100644 index 0000000..0268fce --- /dev/null +++ b/src/or/channel.c @@ -0,0 +1,3420 @@ +/* * Copyright (c) 2012, The Tor Project, Inc. */ +/* See LICENSE for licensing information */ + +/** + * \file channel.c + * \brief OR-to-OR channel abstraction layer + **/ + +/* + * Define this so channel.h gives us things only channel_t subclasses + * should touch. + */ + +#define _TOR_CHANNEL_INTERNAL + +#include "or.h" +#include "channel.h" +#include "channeltls.h" +#include "circuitbuild.h" +#include "circuitlist.h" +#include "geoip.h" +#include "nodelist.h" +#include "relay.h" +#include "rephist.h" +#include "router.h" +#include "routerlist.h" + +/* Cell queue structure */ + +typedef struct cell_queue_entry_s cell_queue_entry_t; +struct cell_queue_entry_s { + enum { + CELL_QUEUE_FIXED, + CELL_QUEUE_VAR, + CELL_QUEUE_PACKED + } type; + union { + struct { + cell_t *cell; + } fixed; + struct { + var_cell_t *var_cell; + } var; + struct { + packed_cell_t *packed_cell; + } packed; + } u; +}; + +/* Global lists of channels */ + +/* All channel_t instances */ +static smartlist_t *all_channels = NULL; + +/* All channel_t instances not in ERROR or CLOSED states */ +static smartlist_t *active_channels = NULL; + +/* All channel_t instances in LISTENING state */ +static smartlist_t *listening_channels = NULL; + +/* All channel_t instances in ERROR or CLOSED states */ +static smartlist_t *finished_channels = NULL; + +/* Counter for ID numbers */ +static uint64_t n_channels_allocated = 0; + +/* Digest->channel map + * + * Similar to the one used in connection_or.c, this maps from the identity + * digest of a remote endpoint to a channel_t to that endpoint. Channels + * should be placed here when registered and removed when they close or error. + * If more than one channel exists, follow the next_with_same_id pointer + * as a linked list. + */ +static digestmap_t *channel_identity_map = NULL; + +/* Functions to maintain the digest map */ +static void channel_add_to_digest_map(channel_t *chan); +static void channel_remove_from_digest_map(channel_t *chan); + +/* + * Flush cells from just the outgoing queue without trying to get them + * from circuits; used internall by channel_flush_some_cells(). + */ +static ssize_t +channel_flush_some_cells_from_outgoing_queue(channel_t *chan, + ssize_t num_cells); + +/*********************************** + * Channel state utility functions * + **********************************/ + +/** + * Indicate whether a given channel state is valid + * + * @param state A channel state + * @return A boolean value indicating whether state is a valid channel state + */ + +int +channel_state_is_valid(channel_state_t state) +{ + int is_valid; + + switch (state) { + case CHANNEL_STATE_CLOSED: + case CHANNEL_STATE_CLOSING: + case CHANNEL_STATE_ERROR: + case CHANNEL_STATE_LISTENING: + case CHANNEL_STATE_MAINT: + case CHANNEL_STATE_OPENING: + case CHANNEL_STATE_OPEN: + is_valid = 1; + break; + case CHANNEL_STATE_LAST: + default: + is_valid = 0; + } + + return is_valid; +} + +/** + * Indicate whether a channel state transition is valid + * + * This function takes two channel states and indicates whether a + * transition between them is permitted (see the state definitions and + * transition table in or.h at the channel_state_t typedef). + * + * @param from Proposed state to transition from + * @param to Proposed state to transition to + * @return A boolean value indicating whether the posposed transition is valid + */ + +int +channel_state_can_transition(channel_state_t from, channel_state_t to) +{ + int is_valid; + + switch (from) { + case CHANNEL_STATE_CLOSED: + is_valid = (to == CHANNEL_STATE_LISTENING || + to == CHANNEL_STATE_OPENING); + break; + case CHANNEL_STATE_CLOSING: + is_valid = (to == CHANNEL_STATE_CLOSED || + to == CHANNEL_STATE_ERROR); + break; + case CHANNEL_STATE_ERROR: + is_valid = 0; + break; + case CHANNEL_STATE_LISTENING: + is_valid = (to == CHANNEL_STATE_CLOSING || + to == CHANNEL_STATE_ERROR); + break; + case CHANNEL_STATE_MAINT: + is_valid = (to == CHANNEL_STATE_CLOSING || + to == CHANNEL_STATE_ERROR || + to == CHANNEL_STATE_OPEN); + break; + case CHANNEL_STATE_OPENING: + is_valid = (to == CHANNEL_STATE_CLOSING || + to == CHANNEL_STATE_ERROR || + to == CHANNEL_STATE_OPEN); + break; + case CHANNEL_STATE_OPEN: + is_valid = (to == CHANNEL_STATE_CLOSING || + to == CHANNEL_STATE_ERROR || + to == CHANNEL_STATE_MAINT); + break; + case CHANNEL_STATE_LAST: + default: + is_valid = 0; + } + + return is_valid; +} + +/** + * Return a human-readable description for a channel state + * + * @param state A channel state + * @return A pointer to a string with a human-readable description of state + */ + +const char * +channel_state_to_string(channel_state_t state) +{ + const char *descr; + + switch (state) { + case CHANNEL_STATE_CLOSED: + descr = "closed"; + break; + case CHANNEL_STATE_CLOSING: + descr = "closing"; + break; + case CHANNEL_STATE_ERROR: + descr = "channel error"; + break; + case CHANNEL_STATE_LISTENING: + descr = "listening"; + break; + case CHANNEL_STATE_MAINT: + descr = "temporarily suspended for maintenance"; + break; + case CHANNEL_STATE_OPENING: + descr = "opening"; + break; + case CHANNEL_STATE_OPEN: + descr = "open"; + break; + case CHANNEL_STATE_LAST: + default: + descr = "unknown or invalid channel state"; + } + + return descr; +} + +/*************************************** + * Channel registration/unregistration * + ***************************************/ + +/** + * Register a channel + * + * This function registers a newly created channel in the global lists/maps + * of active channels. + * + * @param chan A pointer to an unregistered channel + */ + +void +channel_register(channel_t *chan) +{ + tor_assert(chan); + + /* No-op if already registered */ + if (chan->registered) return; + + if (chan->is_listener) { + log_debug(LD_CHANNEL, + "Registering listener channel %p (ID %lu) in state %s (%d)", + chan, chan->global_identifier, + channel_state_to_string(chan->state), chan->state); + } else { + log_debug(LD_CHANNEL, + "Registering cell channel %p (ID %lu) in state %s (%d) " + "with digest %s", + chan, chan->global_identifier, + channel_state_to_string(chan->state), chan->state, + hex_str(chan->u.cell_chan.identity_digest, DIGEST_LEN)); + } + + /* Make sure we have all_channels, then add it */ + if (!all_channels) all_channels = smartlist_new(); + smartlist_add(all_channels, chan); + + /* Is it finished? */ + if (chan->state == CHANNEL_STATE_CLOSED || + chan->state == CHANNEL_STATE_ERROR) { + /* Put it in the finished list, creating it if necessary */ + if (!finished_channels) finished_channels = smartlist_new(); + smartlist_add(finished_channels, chan); + } else { + /* Put it in the active list, creating it if necessary */ + if (!active_channels) active_channels = smartlist_new(); + smartlist_add(active_channels, chan); + + /* Is it a listener? */ + if (chan->is_listener && + chan->state == CHANNEL_STATE_LISTENING) { + /* Put it in the listening list, creating it if necessary */ + if (!listening_channels) listening_channels = smartlist_new(); + smartlist_add(listening_channels, chan); + } else if (chan->state != CHANNEL_STATE_CLOSING) { + if (!(chan->is_listener)) { + /* It should have a digest set */ + if (!tor_digest_is_zero(chan->u.cell_chan.identity_digest)) { + /* Yeah, we're good, add it to the map */ + channel_add_to_digest_map(chan); + } else { + log_info(LD_CHANNEL, + "Channel %p (global ID %lu) in state %s (%d) registered " + "with no identity digest", + chan, chan->global_identifier, + channel_state_to_string(chan->state), chan->state); + } + } + } + } + + /* Mark it as registered */ + chan->registered = 1; +} + +/** + * Unregister a channel + * + * This function removes a channel from the global lists and maps and is used + * when freeing a closed/errored channel. + * + * @param chan A pointer to a channel to be unregistered + */ + +void +channel_unregister(channel_t *chan) +{ + tor_assert(chan); + + /* No-op if not registered */ + if (!(chan->registered)) return; + + /* Is it finished? */ + if (chan->state == CHANNEL_STATE_CLOSED || + chan->state == CHANNEL_STATE_ERROR) { + /* Get it out of the finished list */ + if (finished_channels) smartlist_remove(finished_channels, chan); + } else { + /* Get it out of the active list */ + if (active_channels) smartlist_remove(active_channels, chan); + + /* Is it listening? */ + if (chan->state == CHANNEL_STATE_LISTENING) { + /* Get it out of the listening list */ + if (listening_channels) smartlist_remove(listening_channels, chan); + } + } + + /* Get it out of all_channels */ + if (all_channels) smartlist_remove(all_channels, chan); + + /* Mark it as unregistered */ + chan->registered = 0; + + if (!(chan->is_listener)) { + /* Should it be in the digest map? */ + if (!tor_digest_is_zero(chan->u.cell_chan.identity_digest) && + !(chan->state == CHANNEL_STATE_LISTENING || + chan->state == CHANNEL_STATE_CLOSING || + chan->state == CHANNEL_STATE_CLOSED || + chan->state == CHANNEL_STATE_ERROR)) { + /* Remove it */ + channel_remove_from_digest_map(chan); + } + } +} + +/********************************* + * Channel digest map maintenance + *********************************/ + +/** + * Add a channel to the digest map + * + * This function adds a channel to the digest map and inserts it into the + * correct linked list if channels with that remote endpoint identity digest + * already exist. + * + * @param chan A pointer to a channel to add + */ + +static void +channel_add_to_digest_map(channel_t *chan) +{ + channel_t *tmp; + + tor_assert(chan); + tor_assert(!(chan->is_listener)); + + /* Assert that the state makes sense */ + tor_assert(!(chan->state == CHANNEL_STATE_LISTENING || + chan->state == CHANNEL_STATE_CLOSING || + chan->state == CHANNEL_STATE_CLOSED || + chan->state == CHANNEL_STATE_ERROR)); + + /* Assert that there is a digest */ + tor_assert(!tor_digest_is_zero(chan->u.cell_chan.identity_digest)); + + /* Allocate the identity map if we have to */ + if (!channel_identity_map) channel_identity_map = digestmap_new(); + + /* Insert it */ + tmp = digestmap_set(channel_identity_map, + chan->u.cell_chan.identity_digest, + chan); + if (tmp) { + tor_assert(!(tmp->is_listener)); + /* There already was one, this goes at the head of the list */ + chan->u.cell_chan.next_with_same_id = tmp; + chan->u.cell_chan.prev_with_same_id = NULL; + tmp->u.cell_chan.prev_with_same_id = chan; + } else { + /* First with this digest */ + chan->u.cell_chan.next_with_same_id = NULL; + chan->u.cell_chan.prev_with_same_id = NULL; + } + + log_debug(LD_CHANNEL, + "Added channel %p (%lu) to identity map in state %s (%d) " + "with digest %s", + chan, chan->global_identifier, + channel_state_to_string(chan->state), chan->state, + hex_str(chan->u.cell_chan.identity_digest, DIGEST_LEN)); +} + +/** + * Remove a channel from the digest map + * + * This function removes a channel from the digest map and the linked list of + * channels for that digest if more than one exists. + * + * @param chan A pointer to a channel to remove + */ + +static void +channel_remove_from_digest_map(channel_t *chan) +{ + channel_t *tmp, *head; + + tor_assert(chan); + tor_assert(!(chan->is_listener)); + + /* Assert that there is a digest */ + tor_assert(!tor_digest_is_zero(chan->u.cell_chan.identity_digest)); + + /* Make sure we have a map */ + if (!channel_identity_map) { + /* + * No identity map, so we can't find it by definition. This + * case is similar to digestmap_get() failing below. + */ + log_warn(LD_BUG, + "Trying to remove channel %p (%lu) with digest %s from " + "identity map, but didn't have any identity map", + chan, chan->global_identifier, + hex_str(chan->u.cell_chan.identity_digest, DIGEST_LEN)); + /* Clear out its next/prev pointers */ + if (chan->u.cell_chan.next_with_same_id) { + tor_assert(!(chan->u.cell_chan.next_with_same_id->is_listener)); + chan->u.cell_chan.next_with_same_id->u.cell_chan.prev_with_same_id + = chan->u.cell_chan.prev_with_same_id; + } + if (chan->u.cell_chan.prev_with_same_id) { + tor_assert(!(chan->u.cell_chan.prev_with_same_id->is_listener)); + chan->u.cell_chan.prev_with_same_id->u.cell_chan.next_with_same_id + = chan->u.cell_chan.next_with_same_id; + } + chan->u.cell_chan.next_with_same_id = NULL; + chan->u.cell_chan.prev_with_same_id = NULL; + + return; + } + + /* Look for it in the map */ + tmp = digestmap_get(channel_identity_map, chan->u.cell_chan.identity_digest); + if (tmp) { + /* Okay, it's here */ + head = tmp; /* Keep track of list head */ + /* Look for this channel */ + while (tmp && tmp != chan) { + tor_assert(!(tmp->is_listener)); + tmp = tmp->u.cell_chan.next_with_same_id; + } + + if (tmp == chan) { + /* Found it, good */ + if (chan->u.cell_chan.next_with_same_id) { + tor_assert(!(chan->u.cell_chan.next_with_same_id->is_listener)); + chan->u.cell_chan.next_with_same_id->u.cell_chan.prev_with_same_id + = chan->u.cell_chan.prev_with_same_id; + } + /* else we're the tail of the list */ + if (chan->u.cell_chan.prev_with_same_id) { + tor_assert(!(chan->u.cell_chan.prev_with_same_id->is_listener)); + /* We're not the head of the list, so we can *just* unlink */ + chan->u.cell_chan.prev_with_same_id->u.cell_chan.next_with_same_id + = chan->u.cell_chan.next_with_same_id; + } else { + /* We're the head, so we have to point the digest map entry at our + * next if we have one, or remove it if we're also the tail */ + if (chan->u.cell_chan.next_with_same_id) { + tor_assert(!(chan->u.cell_chan.next_with_same_id->is_listener)); + digestmap_set(channel_identity_map, + chan->u.cell_chan.identity_digest, + chan->u.cell_chan.next_with_same_id); + } else { + digestmap_remove(channel_identity_map, + chan->u.cell_chan.identity_digest); + } + } + + /* NULL out its next/prev pointers, and we're finished */ + chan->u.cell_chan.next_with_same_id = NULL; + chan->u.cell_chan.prev_with_same_id = NULL; + + log_debug(LD_CHANNEL, + "Removed channel %p (%lu) from identity map in state %s (%d) " + "with digest %s", + chan, chan->global_identifier, + channel_state_to_string(chan->state), chan->state, + hex_str(chan->u.cell_chan.identity_digest, DIGEST_LEN)); + } else { + /* This is not good */ + log_warn(LD_BUG, + "Trying to remove channel %p (%lu) with digest %s from " + "identity map, but couldn't find it in the list for that " + "digest", + chan, chan->global_identifier, + hex_str(chan->u.cell_chan.identity_digest, DIGEST_LEN)); + /* Unlink it and hope for the best */ + if (chan->u.cell_chan.next_with_same_id) { + tor_assert(!(chan->u.cell_chan.next_with_same_id->is_listener)); + chan->u.cell_chan.next_with_same_id->u.cell_chan.prev_with_same_id + = chan->u.cell_chan.prev_with_same_id; + } + if (chan->u.cell_chan.prev_with_same_id) { + tor_assert(!(chan->u.cell_chan.prev_with_same_id->is_listener)); + chan->u.cell_chan.prev_with_same_id->u.cell_chan.next_with_same_id + = chan->u.cell_chan.next_with_same_id; + } + chan->u.cell_chan.next_with_same_id = NULL; + chan->u.cell_chan.prev_with_same_id = NULL; + } + } else { + /* Shouldn't happen */ + log_warn(LD_BUG, + "Trying to remove channel %p (%lu) with digest %s from " + "identity map, but couldn't find any with that digest", + chan, chan->global_identifier, + hex_str(chan->u.cell_chan.identity_digest, DIGEST_LEN)); + /* Clear out its next/prev pointers */ + if (chan->u.cell_chan.next_with_same_id) { + tor_assert(!(chan->u.cell_chan.next_with_same_id->is_listener)); + chan->u.cell_chan.next_with_same_id->u.cell_chan.prev_with_same_id + = chan->u.cell_chan.prev_with_same_id; + } + if (chan->u.cell_chan.prev_with_same_id) { + chan->u.cell_chan.prev_with_same_id->u.cell_chan.next_with_same_id + = chan->u.cell_chan.next_with_same_id; + } + chan->u.cell_chan.next_with_same_id = NULL; + chan->u.cell_chan.prev_with_same_id = NULL; + } +} + +/**************************** + * Channel lookup functions * + ***************************/ + +/** + * Find channel by global ID + * + * This function searches for a channel by the global_identifier assigned + * at initialization time. This identifier is unique for the lifetime of the + * Tor process. + * + * @param global_identifier The global_identifier value to search for + * @return A pointer to the channel with that global identifier, or NULL if + * none exists. + */ + +channel_t * +channel_find_by_global_id(uint64_t global_identifier) +{ + channel_t *rv = NULL; + + if (all_channels && smartlist_len(all_channels) > 0) { + SMARTLIST_FOREACH_BEGIN(all_channels, channel_t *, curr) { + if (curr->global_identifier == global_identifier) { + rv = curr; + break; + } + } SMARTLIST_FOREACH_END(curr); + } + + return rv; +} + +/** + * Find channel by digest of the remote endpoint + * + * This function looks up a channel by the digest of its remote endpoint in + * the channel digest map. It's possible that more than one channel to a + * given endpoint exists. Use channel_next_with_digest() and + * channel_prev_with_digest() to walk the list. + * + * @param identity_digest A digest to search for + * @return A channel pointer, or NULL if no channel to this endpoint exists. + */ + +channel_t * +channel_find_by_remote_digest(const char *identity_digest) +{ + channel_t *rv = NULL, *tmp; + + tor_assert(identity_digest); + + /* Search for it in the identity map */ + if (channel_identity_map) { + tmp = digestmap_get(channel_identity_map, identity_digest); + rv = tmp; + } + + return rv; +} + +/** + * Find channel by remote nickname + * + * This function looks up a channel by the nickname of the remote + * endpoint. It's possible that more than one channel to that endpoint + * nickname exists, but there is not currently any supported way to iterate + * them. Use digests. + * + * @param nickname A node nickname + * @return A channel pointer to a channel to a node with that nickname, or + * NULL if none is available. + */ + +channel_t * +channel_find_by_remote_nickname(const char *nickname) +{ + channel_t *rv = NULL; + + tor_assert(nickname); + + if (all_channels && smartlist_len(all_channels) > 0) { + SMARTLIST_FOREACH_BEGIN(all_channels, channel_t *, curr) { + if (!(curr->is_listener)) { + if (curr->u.cell_chan.nickname && + strncmp(curr->u.cell_chan.nickname, nickname, + MAX_NICKNAME_LEN) == 0) { + rv = curr; + break; + } + } + } SMARTLIST_FOREACH_END(curr); + } + + return rv; +} + +/** + * Next channel with digest + * + * This function takes a channel and finds the next channel in the list + * with the same digest. + * + * @param chan Channel pointer to iterate + * @return A pointer to the next channel after chan with the same remote + * endpoint identity digest, or NULL if none exists. + */ + +channel_t * +channel_next_with_digest(channel_t *chan) +{ + channel_t *rv = NULL; + + tor_assert(chan); + tor_assert(!(chan->is_listener)); + + if (chan->u.cell_chan.next_with_same_id) + rv = chan->u.cell_chan.next_with_same_id; + + return rv; +} + +/** + * Previous channel with digest + * + * This function takes a channel and finds the previos channel in the list + * with the same digest. + * + * @param chan Channel pointer to iterate + * @return A pointer to the previous channel after chan with the same remote + * endpoint identity digest, or NULL if none exists. + */ + +channel_t * +channel_prev_with_digest(channel_t *chan) +{ + channel_t *rv = NULL; + + tor_assert(chan); + tor_assert(!(chan->is_listener)); + + if (chan->u.cell_chan.prev_with_same_id) + rv = chan->u.cell_chan.prev_with_same_id; + + return rv; +} + +/** + * Internal-only channel init function for cell channels + * + * This function should be called by subclasses to set up some per-channel + * variables. I.e., this is the superclass constructor. Before this, the + * channel should be allocated with tor_malloc_zero(). + * + * @param chan Pointer to a channel to initialize. + */ + +void +channel_init_for_cells(channel_t *chan) +{ + tor_assert(chan); + + /* Assign an ID and bump the counter */ + chan->global_identifier = n_channels_allocated++; + + /* Mark as a non-listener */ + chan->is_listener = 0; + + /* Init timestamp */ + chan->u.cell_chan.timestamp_last_added_nonpadding = time(NULL); + + /* Init next_circ_id */ + chan->u.cell_chan.next_circ_id = crypto_rand_int(1 << 15); + + /* Timestamp it */ + channel_timestamp_created(chan); +} + +/** + * Internal-only channel init function for listener channels + * + * This function should be called by subclasses to set up some per-channel + * variables. I.e., this is the superclass constructor. Before this, the + * channel should be allocated with tor_malloc_zero(). + * + * @param chan Pointer to a channel to initialize. + */ + +void +channel_init_listener(channel_t *chan) +{ + tor_assert(chan); + + /* Assign an ID and bump the counter */ + chan->global_identifier = n_channels_allocated++; + + /* Mark as a listener */ + chan->is_listener = 1; + + /* Timestamp it */ + channel_timestamp_created(chan); +} + +/** + * Internal-only channel free function + * + * Nothing outside of channel.c should call this; it frees channels after + * they have closed and been unregistered. + * + * @param chan Channel to free + */ + +void +channel_free(channel_t *chan) +{ + tor_assert(chan); + /* It must be closed or errored */ + tor_assert(chan->state == CHANNEL_STATE_CLOSED || + chan->state == CHANNEL_STATE_ERROR); + /* It must be deregistered */ + tor_assert(!(chan->registered)); + + /* Call a free method if there is one */ + if (chan->free) chan->free(chan); + + if (!(chan->is_listener)) { + channel_clear_remote_end(chan); + + if (chan->u.cell_chan.active_circuit_pqueue) { + smartlist_free(chan->u.cell_chan.active_circuit_pqueue); + chan->u.cell_chan.active_circuit_pqueue = NULL; + } + } + + /* We're in CLOSED or ERROR, so the cell queue is already empty */ + + tor_free(chan); +} + +/** + * Internal-only forcible channel free function + * + * This is like channel_free, but doesn't do the state/registration asserts; + * it should only be used from channel_free_all() when shutting down. + */ + +void +channel_force_free(channel_t *chan) +{ + cell_queue_entry_t *tmp = NULL; + channel_t *tmpchan = NULL; + + tor_assert(chan); + + /* Call a free method if there is one */ + if (chan->free) chan->free(chan); + + if (chan->is_listener) { + /* + * The incoming list just gets emptied and freed; we request close on + * any channels we find there, but since we got called while shutting + * down they will get deregistered and freed elsewhere anyway. + */ + if (chan->u.listener.incoming_list) { + SMARTLIST_FOREACH_BEGIN(chan->u.listener.incoming_list, + channel_t *, qchan) { + tmpchan = qchan; + SMARTLIST_DEL_CURRENT(chan->u.listener.incoming_list, qchan); + channel_request_close(tmpchan); + } SMARTLIST_FOREACH_END(qchan); + + smartlist_free(chan->u.listener.incoming_list); + chan->u.listener.incoming_list = NULL; + } + } else { + channel_clear_remote_end(chan); + smartlist_free(chan->u.cell_chan.active_circuit_pqueue); + + /* We might still have a cell queue; kill it */ + if (chan->u.cell_chan.cell_queue) { + SMARTLIST_FOREACH_BEGIN(chan->u.cell_chan.cell_queue, + cell_queue_entry_t *, q) { + tmp = q; + SMARTLIST_DEL_CURRENT(chan->u.cell_chan.cell_queue, q); + tor_free(q); + } SMARTLIST_FOREACH_END(q); + + smartlist_free(chan->u.cell_chan.cell_queue); + chan->u.cell_chan.cell_queue = NULL; + } + + /* Outgoing cell queue is similar, but we can have to free packed cells */ + if (chan->u.cell_chan.outgoing_queue) { + SMARTLIST_FOREACH_BEGIN(chan->u.cell_chan.outgoing_queue, + cell_queue_entry_t *, q) { + tmp = q; + SMARTLIST_DEL_CURRENT(chan->u.cell_chan.outgoing_queue, q); + if (tmp->type == CELL_QUEUE_PACKED) { + if (tmp->u.packed.packed_cell) { + packed_cell_free(tmp->u.packed.packed_cell); + } + } + tor_free(tmp); + } SMARTLIST_FOREACH_END(q); + + smartlist_free(chan->u.cell_chan.outgoing_queue); + chan->u.cell_chan.outgoing_queue = NULL; + } + } + + tor_free(chan); +} + +/** + * Return the current registered listener for a channel + * + * This function returns a function pointer to the current registered + * handler for new incoming channels on a listener channel. + * + * @param chan Channel to get listener for + * @return Function pointer to an incoming channel handler + */ + +void +(* channel_get_listener(channel_t *chan)) + (channel_t *, channel_t *) +{ + tor_assert(chan); + tor_assert(chan->is_listener); + + if (chan->state == CHANNEL_STATE_LISTENING) + return chan->u.listener.listener; + + return NULL; +} + +/** + * Set the listener for a channel + * + * This function sets the handler for new incoming channels on a listener + * channel. + * + * @param chan Listener channel to set handler on + * @param listener Function pointer to new incoming channel handler + */ + +void +channel_set_listener(channel_t *chan, + void (*listener)(channel_t *, channel_t *) ) +{ + tor_assert(chan); + tor_assert(chan->is_listener); + tor_assert(chan->state == CHANNEL_STATE_LISTENING); + + log_debug(LD_CHANNEL, + "Setting listener callback for channel %p to %p", + chan, listener); + + chan->u.listener.listener = listener; + if (chan->u.listener.listener) channel_process_incoming(chan); +} + +/** + * Return the fixed-length cell handler for a channel + * + * This function gets the handler for incoming fixed-length cells installed + * on a channel. + * + * @param chan Channel to get the fixed-length cell handler for + * @return A function pointer to chan's fixed-length cell handler, if any. + */ + +void +(* channel_get_cell_handler(channel_t *chan)) + (channel_t *, cell_t *) +{ + tor_assert(chan); + tor_assert(!(chan->is_listener)); + + if (chan->state == CHANNEL_STATE_OPENING || + chan->state == CHANNEL_STATE_OPEN || + chan->state == CHANNEL_STATE_MAINT) + return chan->u.cell_chan.cell_handler; + + return NULL; +} + +/** + * Return the variable-length cell handler for a channel + * + * This function gets the handler for incoming variable-length cells + * installed on a channel. + * + * @param chan Channel to get the variable-length cell handler for + * @return A function pointer to chan's variable-length cell handler, if any. + */ + +void +(* channel_get_var_cell_handler(channel_t *chan)) + (channel_t *, var_cell_t *) +{ + tor_assert(chan); + tor_assert(!(chan->is_listener)); + + if (chan->state == CHANNEL_STATE_OPENING || + chan->state == CHANNEL_STATE_OPEN || + chan->state == CHANNEL_STATE_MAINT) + return chan->u.cell_chan.var_cell_handler; + + return NULL; +} + +/** + * Set the fixed-length cell handler for a channel + * + * This function sets the fixed-length cell handler for a channel and + * processes any incoming cells that had been blocked in the queue because + * none was available. + * + * @param chan Channel to set the fixed-length cell handler for + * @param cell_handler Function pointer to new fixed-length cell handler + */ + +void +channel_set_cell_handler(channel_t *chan, + void (*cell_handler)(channel_t *, cell_t *)) +{ + int changed = 0; + + tor_assert(chan); + tor_assert(!(chan->is_listener)); + tor_assert(chan->state == CHANNEL_STATE_OPENING || + chan->state == CHANNEL_STATE_OPEN || + chan->state == CHANNEL_STATE_MAINT); + + log_debug(LD_CHANNEL, + "Setting cell_handler callback for channel %p to %p", + chan, cell_handler); + + /* + * Keep track whether we've changed it so we know if there's any point in + * re-running the queue. + */ + if (cell_handler != chan->u.cell_chan.cell_handler) changed = 1; + + /* Change it */ + chan->u.cell_chan.cell_handler = cell_handler; + + /* Re-run the queue if we have one and there's any reason to */ + if (chan->u.cell_chan.cell_queue && + (smartlist_len(chan->u.cell_chan.cell_queue) > 0) && + changed && + chan->u.cell_chan.cell_handler) channel_process_cells(chan); +} + +/** + * Set the both cell handlers for a channel + * + * This function sets both the fixed-length and variable length cell handlers + * for a channel and processes any incoming cells that had been blocked in the + * queue because none were available. + * + * @param chan Channel to set the fixed-length cell handler for + * @param cell_handler Function pointer to new fixed-length cell handler + * @param var_cell_handler Function pointer to new variable-length cell + handler + */ + +void +channel_set_cell_handlers(channel_t *chan, + void (*cell_handler)(channel_t *, cell_t *), + void (*var_cell_handler)(channel_t *, + var_cell_t *)) +{ + int try_again = 0; + + tor_assert(chan); + tor_assert(!(chan->is_listener)); + tor_assert(chan->state == CHANNEL_STATE_OPENING || + chan->state == CHANNEL_STATE_OPEN || + chan->state == CHANNEL_STATE_MAINT); + + log_debug(LD_CHANNEL, + "Setting cell_handler callback for channel %p to %p", + chan, cell_handler); + log_debug(LD_CHANNEL, + "Setting var_cell_handler callback for channel %p to %p", + chan, var_cell_handler); + + /* Should we try the queue? */ + if (cell_handler && + cell_handler != chan->u.cell_chan.cell_handler) try_again = 1; + if (var_cell_handler && + var_cell_handler != chan->u.cell_chan.var_cell_handler) try_again = 1; + + /* Change them */ + chan->u.cell_chan.cell_handler = cell_handler; + chan->u.cell_chan.var_cell_handler = var_cell_handler; + + /* Re-run the queue if we have one and there's any reason to */ + if (chan->u.cell_chan.cell_queue && + (smartlist_len(chan->u.cell_chan.cell_queue) > 0) && + try_again && + (chan->u.cell_chan.cell_handler || + chan->u.cell_chan.var_cell_handler)) channel_process_cells(chan); +} + +/** + * Set the variable-length cell handler for a channel + * + * This function sets the variable-length cell handler for a channel and + * processes any incoming cells that had been blocked in the queue because + * none was available. + * + * @param chan Channel to set the variable-length cell handler for + * @param cell_handler Function pointer to new variable-length cell handler + */ + +void +channel_set_var_cell_handler(channel_t *chan, + void (*var_cell_handler)(channel_t *, + var_cell_t *)) +{ + int changed = 0; + + tor_assert(chan); + tor_assert(!(chan->is_listener)); + tor_assert(chan->state == CHANNEL_STATE_OPENING || + chan->state == CHANNEL_STATE_OPEN || + chan->state == CHANNEL_STATE_MAINT); + + log_debug(LD_CHANNEL, + "Setting var_cell_handler callback for channel %p to %p", + chan, var_cell_handler); + + /* + * Keep track whether we've changed it so we know if there's any point in + * re-running the queue. + */ + if (var_cell_handler != chan->u.cell_chan.var_cell_handler) changed = 1; + + /* Change it */ + chan->u.cell_chan.var_cell_handler = var_cell_handler; + + /* Re-run the queue if we have one and there's any reason to */ + if (chan->u.cell_chan.cell_queue && + (smartlist_len(chan->u.cell_chan.cell_queue) > 0) && + changed && chan->u.cell_chan.var_cell_handler) + channel_process_cells(chan); +} + +/** + * Request a channel be closed + * + * This function tries to close a channel_t; it will go into the CLOSING + * state, and eventually the lower layer should put it into the CLOSED or + * ERROR state. Then, channel_run_cleanup() will eventually free it. + * + * @param chan Channel to close + */ + +void +channel_request_close(channel_t *chan) +{ + tor_assert(chan != NULL); + tor_assert(chan->close != NULL); + + /* If it's already in CLOSING, CLOSED or ERROR, this is a no-op */ + if (chan->state == CHANNEL_STATE_CLOSING || + chan->state == CHANNEL_STATE_CLOSED || + chan->state == CHANNEL_STATE_ERROR) return; + + log_debug(LD_CHANNEL, + "Closing channel %p by request", + chan); + + /* Note closing by request from above */ + chan->reason_for_closing = CHANNEL_CLOSE_REQUESTED; + + /* Change state to CLOSING */ + channel_change_state(chan, CHANNEL_STATE_CLOSING); + + /* Tell the lower layer */ + chan->close(chan); + + /* + * It's up to the lower layer to change state to CLOSED or ERROR when we're + * ready; we'll try to free channels that are in the finished list from + * channel_run_cleanup(). The lower layer should do this by calling + * channel_closed(). + */ +} + +/** + * Close a channel from the lower layer + * + * Notify the channel code that the channel is being closed due to a non-error + * condition in the lower layer. This does not call the close() method, since + * the lower layer already knows. + * + * @param chan Channel to notify for close + */ + +void +channel_close_from_lower_layer(channel_t *chan) +{ + tor_assert(chan != NULL); + + /* If it's already in CLOSING, CLOSED or ERROR, this is a no-op */ + if (chan->state == CHANNEL_STATE_CLOSING || + chan->state == CHANNEL_STATE_CLOSED || + chan->state == CHANNEL_STATE_ERROR) return; + + log_debug(LD_CHANNEL, + "Closing channel %p due to lower-layer event", + chan); + + /* Note closing by event from below */ + chan->reason_for_closing = CHANNEL_CLOSE_FROM_BELOW; + + /* Change state to CLOSING */ + channel_change_state(chan, CHANNEL_STATE_CLOSING); +} + +/** + * Notify that the channel is being closed due to an error condition + * + * This function is called by the lower layer implementing the transport + * when a channel must be closed due to an error condition. This does not + * call the channel's close method, since the lower layer already knows. + * + * @param chan Channel to notify for error + */ + +void +channel_close_for_error(channel_t *chan) +{ + tor_assert(chan != NULL); + + /* If it's already in CLOSING, CLOSED or ERROR, this is a no-op */ + if (chan->state == CHANNEL_STATE_CLOSING || + chan->state == CHANNEL_STATE_CLOSED || + chan->state == CHANNEL_STATE_ERROR) return; + + log_debug(LD_CHANNEL, + "Closing channel %p due to lower-layer error", + chan); + + /* Note closing by event from below */ + chan->reason_for_closing = CHANNEL_CLOSE_FOR_ERROR; + + /* Change state to CLOSING */ + channel_change_state(chan, CHANNEL_STATE_CLOSING); +} + +/** + * Notify that the lower layer is finished closing the channel + * + * This function should be called by the lower layer when a channel + * is finished closing and it should be regarded as inactive and + * freed by the channel code. + * + * @param chan Channel to notify closure on + */ + +void +channel_closed(channel_t *chan) +{ + tor_assert(chan); + tor_assert(chan->state == CHANNEL_STATE_CLOSING || + chan->state == CHANNEL_STATE_CLOSED || + chan->state == CHANNEL_STATE_ERROR); + + /* No-op if already inactive */ + if (chan->state == CHANNEL_STATE_CLOSED || + chan->state == CHANNEL_STATE_ERROR) return; + + if (chan->reason_for_closing == CHANNEL_CLOSE_FOR_ERROR) { + /* Inform any pending (not attached) circs that they should + * give up. */ + circuit_n_chan_done(chan, 0); + } + /* Now close all the attached circuits on it. */ + circuit_unlink_all_from_channel(chan, END_CIRC_REASON_CHANNEL_CLOSED); + + if (chan->reason_for_closing != CHANNEL_CLOSE_FOR_ERROR) { + channel_change_state(chan, CHANNEL_STATE_CLOSED); + } else { + channel_change_state(chan, CHANNEL_STATE_ERROR); + } +} + +/** + * Clear the identity_digest of a channel + * + * This function clears the identity digest of the remote endpoint for a + * channel; this is intended for use by the lower layer. + * + * @param chan Channel to clear + */ + +void +channel_clear_identity_digest(channel_t *chan) +{ + int state_not_in_map; + + tor_assert(chan); + tor_assert(!(chan->is_listener)); + + log_debug(LD_CHANNEL, + "Clearing remote endpoint digest on channel %p with " + "global ID %lu", + chan, chan->global_identifier); + + state_not_in_map = + (chan->state == CHANNEL_STATE_LISTENING || + chan->state == CHANNEL_STATE_CLOSING || + chan->state == CHANNEL_STATE_CLOSED || + chan->state == CHANNEL_STATE_ERROR); + + if (!state_not_in_map && chan->registered && + !tor_digest_is_zero(chan->u.cell_chan.identity_digest)) + /* if it's registered get it out of the digest map */ + channel_remove_from_digest_map(chan); + + memset(chan->u.cell_chan.identity_digest, 0, + sizeof(chan->u.cell_chan.identity_digest)); +} + +/** + * Set the identity_digest of a channel + * + * This function sets the identity digest of the remote endpoint for a + * channel; this is intended for use by the lower layer. + * + * @param chan Channel to clear + * @param identity_digest New identity digest for chan + */ + +void +channel_set_identity_digest(channel_t *chan, + const char *identity_digest) +{ + int was_in_digest_map, should_be_in_digest_map, state_not_in_map; + + tor_assert(chan); + tor_assert(!(chan->is_listener)); + + log_debug(LD_CHANNEL, + "Setting remote endpoint digest on channel %p with " + "global ID %lu to digest %s", + chan, chan->global_identifier, + identity_digest ? + hex_str(identity_digest, DIGEST_LEN) : "(null)"); + + state_not_in_map = + (chan->state == CHANNEL_STATE_LISTENING || + chan->state == CHANNEL_STATE_CLOSING || + chan->state == CHANNEL_STATE_CLOSED || + chan->state == CHANNEL_STATE_ERROR); + was_in_digest_map = + !state_not_in_map && + chan->registered && + !tor_digest_is_zero(chan->u.cell_chan.identity_digest); + should_be_in_digest_map = + !state_not_in_map && + chan->registered && + (identity_digest && + !tor_digest_is_zero(identity_digest)); + + if (was_in_digest_map) + /* We should always remove it; we'll add it back if we're writing + * in a new digest. + */ + channel_remove_from_digest_map(chan); + + if (identity_digest) { + memcpy(chan->u.cell_chan.identity_digest, + identity_digest, + sizeof(chan->u.cell_chan.identity_digest)); + } else { + memset(chan->u.cell_chan.identity_digest, 0, + sizeof(chan->u.cell_chan.identity_digest)); + } + + /* Put it in the digest map if we should */ + if (should_be_in_digest_map) + channel_add_to_digest_map(chan); +} + +/** + * Clear the remote end metadata (identity_digest/nickname) of a channel + * + * This function clears all the remote end info from a channel; this is + * intended for use by the lower layer. + * + * @param chan Channel to clear + */ + +void +channel_clear_remote_end(channel_t *chan) +{ + int state_not_in_map; + + tor_assert(chan); + tor_assert(!(chan->is_listener)); + + log_debug(LD_CHANNEL, + "Clearing remote endpoint identity on channel %p with " + "global ID %lu", + chan, chan->global_identifier); + + state_not_in_map = + (chan->state == CHANNEL_STATE_LISTENING || + chan->state == CHANNEL_STATE_CLOSING || + chan->state == CHANNEL_STATE_CLOSED || + chan->state == CHANNEL_STATE_ERROR); + + if (!state_not_in_map && chan->registered && + !tor_digest_is_zero(chan->u.cell_chan.identity_digest)) + /* if it's registered get it out of the digest map */ + channel_remove_from_digest_map(chan); + + memset(chan->u.cell_chan.identity_digest, 0, + sizeof(chan->u.cell_chan.identity_digest)); + tor_free(chan->u.cell_chan.nickname); +} + +/** + * Set the remote end metadata (identity_digest/nickname) of a channel + * + * This function sets new remote end info on a channel; this is intended + * for use by the lower layer. + * + * @chan Channel to set data on + * @chan identity_digest New identity digest for chan + * @chan nickname New remote nickname for chan + */ + +void +channel_set_remote_end(channel_t *chan, + const char *identity_digest, + const char *nickname) +{ + int was_in_digest_map, should_be_in_digest_map, state_not_in_map; + + tor_assert(chan); + tor_assert(!(chan->is_listener)); + + log_debug(LD_CHANNEL, + "Setting remote endpoint identity on channel %p with " + "global ID %lu to nickname %s, digest %s", + chan, chan->global_identifier, + nickname ? nickname : "(null)", + identity_digest ? + hex_str(identity_digest, DIGEST_LEN) : "(null)"); + + state_not_in_map = + (chan->state == CHANNEL_STATE_LISTENING || + chan->state == CHANNEL_STATE_CLOSING || + chan->state == CHANNEL_STATE_CLOSED || + chan->state == CHANNEL_STATE_ERROR); + was_in_digest_map = + !state_not_in_map && + chan->registered && + !tor_digest_is_zero(chan->u.cell_chan.identity_digest); + should_be_in_digest_map = + !state_not_in_map && + chan->registered && + (identity_digest && + !tor_digest_is_zero(identity_digest)); + + if (was_in_digest_map) + /* We should always remove it; we'll add it back if we're writing + * in a new digest. + */ + channel_remove_from_digest_map(chan); + + if (identity_digest) { + memcpy(chan->u.cell_chan.identity_digest, + identity_digest, + sizeof(chan->u.cell_chan.identity_digest)); + + } else { + memset(chan->u.cell_chan.identity_digest, 0, + sizeof(chan->u.cell_chan.identity_digest)); + } + + tor_free(chan->u.cell_chan.nickname); + if (nickname) + chan->u.cell_chan.nickname = tor_strdup(nickname); + + /* Put it in the digest map if we should */ + if (should_be_in_digest_map) + channel_add_to_digest_map(chan); +} + +/** + * Write a cell to a channel + * + * Write a fixed-length cell to a channel using the write_cell() method. + * This is equivalent to the pre-channels connection_or_write_cell_to_buf(). + * + * @param chan Channel to write a cell to + * @param cell Cell to write to chan + */ + +void +channel_write_cell(channel_t *chan, cell_t *cell) +{ + cell_queue_entry_t *q; + int sent = 0; + + tor_assert(chan); + tor_assert(!(chan->is_listener)); + tor_assert(cell); + tor_assert(chan->u.cell_chan.write_cell); + + /* Assert that the state makes sense for a cell write */ + tor_assert(chan->state == CHANNEL_STATE_OPENING || + chan->state == CHANNEL_STATE_OPEN || + chan->state == CHANNEL_STATE_MAINT); + + log_debug(LD_CHANNEL, + "Writing cell_t %p to channel %p with global ID %lu", + cell, chan, chan->global_identifier); + + /* Increment the timestamp unless it's padding */ + if (!(cell->command == CELL_PADDING || + cell->command == CELL_VPADDING)) { + chan->u.cell_chan.timestamp_last_added_nonpadding = approx_time(); + } + + /* Can we send it right out? If so, try */ + if (!(chan->u.cell_chan.outgoing_queue && + (smartlist_len(chan->u.cell_chan.outgoing_queue) > 0)) && + chan->state == CHANNEL_STATE_OPEN) { + if (chan->u.cell_chan.write_cell(chan, cell)) { + sent = 1; + /* Timestamp for transmission */ + channel_timestamp_xmit(chan); + /* If we're here the queue is empty, so it's drained too */ + channel_timestamp_drained(chan); + } + } + + if (!sent) { + /* Not sent, queue it */ + if (!(chan->u.cell_chan.outgoing_queue)) + chan->u.cell_chan.outgoing_queue = smartlist_new(); + q = tor_malloc(sizeof(*q)); + q->type = CELL_QUEUE_FIXED; + q->u.fixed.cell = cell; + smartlist_add(chan->u.cell_chan.outgoing_queue, q); + /* Try to process the queue? */ + if (chan->state == CHANNEL_STATE_OPEN) channel_flush_cells(chan); + } +} + +/** + * Write a packed cell to a channel + * + * Write a packed cell to a channel using the write_cell() method. + * + * @param chan Channel to write a cell to + * @param packed_cell Cell to write to chan + */ + +void +channel_write_packed_cell(channel_t *chan, packed_cell_t *packed_cell) +{ + cell_queue_entry_t *q; + int sent = 0; + + tor_assert(chan); + tor_assert(!(chan->is_listener)); + tor_assert(packed_cell); + tor_assert(chan->u.cell_chan.write_packed_cell); + + /* Assert that the state makes sense for a cell write */ + tor_assert(chan->state == CHANNEL_STATE_OPENING || + chan->state == CHANNEL_STATE_OPEN || + chan->state == CHANNEL_STATE_MAINT); + + log_debug(LD_CHANNEL, + "Writing packed_cell_t %p to channel %p with global ID %lu", + packed_cell, chan, chan->global_identifier); + + /* Increment the timestamp */ + chan->u.cell_chan.timestamp_last_added_nonpadding = approx_time(); + + /* Can we send it right out? If so, try */ + if (!(chan->u.cell_chan.outgoing_queue && + (smartlist_len(chan->u.cell_chan.outgoing_queue) > 0)) && + chan->state == CHANNEL_STATE_OPEN) { + if (chan->u.cell_chan.write_packed_cell(chan, packed_cell)) { + sent = 1; + /* Timestamp for transmission */ + channel_timestamp_xmit(chan); + /* If we're here the queue is empty, so it's drained too */ + channel_timestamp_drained(chan); + } + } + + if (!sent) { + /* Not sent, queue it */ + if (!(chan->u.cell_chan.outgoing_queue)) + chan->u.cell_chan.outgoing_queue = smartlist_new(); + q = tor_malloc(sizeof(*q)); + q->type = CELL_QUEUE_PACKED; + q->u.packed.packed_cell = packed_cell; + smartlist_add(chan->u.cell_chan.outgoing_queue, q); + /* Try to process the queue? */ + if (chan->state == CHANNEL_STATE_OPEN) channel_flush_cells(chan); + } +} + +/** + * Write a variable-length cell to a channel + * + * Write a variable-length cell to a channel using the write_cell() method. + * This is equivalent to the pre-channels + * connection_or_write_var_cell_to_buf(). + * + * @param chan Channel to write a cell to + * @param var_cell Cell to write to chan + */ + +void +channel_write_var_cell(channel_t *chan, var_cell_t *var_cell) +{ + cell_queue_entry_t *q; + int sent = 0; + + tor_assert(chan); + tor_assert(!(chan->is_listener)); + tor_assert(var_cell); + tor_assert(chan->u.cell_chan.write_var_cell); + + /* Assert that the state makes sense for a cell write */ + tor_assert(chan->state == CHANNEL_STATE_OPENING || + chan->state == CHANNEL_STATE_OPEN || + chan->state == CHANNEL_STATE_MAINT); + + log_debug(LD_CHANNEL, + "Writing var_cell_t %p to channel %p with global ID %lu", + var_cell, chan, chan->global_identifier); + + /* Increment the timestamp unless it's padding */ + if (!(var_cell->command == CELL_PADDING || + var_cell->command == CELL_VPADDING)) { + chan->u.cell_chan.timestamp_last_added_nonpadding = approx_time(); + } + + /* Can we send it right out? If so, then try */ + if (!(chan->u.cell_chan.outgoing_queue && + (smartlist_len(chan->u.cell_chan.outgoing_queue) > 0)) && + chan->state == CHANNEL_STATE_OPEN) { + if (chan->u.cell_chan.write_var_cell(chan, var_cell)) { + sent = 1; + /* Timestamp for transmission */ + channel_timestamp_xmit(chan); + /* If we're here the queue is empty, so it's drained too */ + channel_timestamp_drained(chan); + } + } + + if (!sent) { + /* Not sent, queue it */ + if (!(chan->u.cell_chan.outgoing_queue)) + chan->u.cell_chan.outgoing_queue = smartlist_new(); + q = tor_malloc(sizeof(*q)); + q->type = CELL_QUEUE_VAR; + q->u.var.var_cell = var_cell; + smartlist_add(chan->u.cell_chan.outgoing_queue, q); + /* Try to process the queue? */ + if (chan->state == CHANNEL_STATE_OPEN) channel_flush_cells(chan); + } +} + +/** + * Change channel state + * + * This internal and subclass use only function is used to change channel + * state, performing all transition validity checks and whatever actions + * are appropriate to the state transition in question. + * + * @param chan Channel to change state on + * @param to_state State to change chan to + */ + +void +channel_change_state(channel_t *chan, channel_state_t to_state) +{ + channel_state_t from_state; + unsigned char was_active, is_active, was_listening, is_listening; + unsigned char was_in_id_map, is_in_id_map; + + tor_assert(chan); + from_state = chan->state; + + tor_assert(channel_state_is_valid(from_state)); + tor_assert(channel_state_is_valid(to_state)); + tor_assert(channel_state_can_transition(chan->state, to_state)); + + if (chan->is_listener) { + tor_assert(from_state == CHANNEL_STATE_LISTENING || + from_state == CHANNEL_STATE_CLOSING || + from_state == CHANNEL_STATE_CLOSED || + from_state == CHANNEL_STATE_ERROR); + tor_assert(to_state == CHANNEL_STATE_LISTENING || + to_state == CHANNEL_STATE_CLOSING || + to_state == CHANNEL_STATE_CLOSED || + to_state == CHANNEL_STATE_ERROR); + } else { + tor_assert(from_state != CHANNEL_STATE_LISTENING); + tor_assert(to_state != CHANNEL_STATE_LISTENING); + } + + /* Check for no-op transitions */ + if (from_state == to_state) { + log_debug(LD_CHANNEL, + "Got no-op transition from \"%s\" to itself on channel %p", + channel_state_to_string(to_state), + chan); + return; + } + + /* If we're going to a closing or closed state, we must have a reason set */ + if (to_state == CHANNEL_STATE_CLOSING || + to_state == CHANNEL_STATE_CLOSED || + to_state == CHANNEL_STATE_ERROR) { + tor_assert(chan->reason_for_closing != CHANNEL_NOT_CLOSING); + } + + /* + * We need to maintain the queues here for some transitions: + * when we enter CHANNEL_STATE_OPEN (especially from CHANNEL_STATE_MAINT) + * we may have a backlog of cells to transmit, so drain the queues in + * that case, and when going to CHANNEL_STATE_CLOSED the subclass + * should have made sure to finish sending things (or gone to + * CHANNEL_STATE_ERROR if not possible), so we assert for that here. + */ + + log_debug(LD_CHANNEL, + "Changing state of channel %p from \"%s\" to \"%s\"", + chan, + channel_state_to_string(chan->state), + channel_state_to_string(to_state)); + + chan->state = to_state; + + /* Need to add to the right lists if the channel is registered */ + if (chan->registered) { + was_active = !(from_state == CHANNEL_STATE_CLOSED || + from_state == CHANNEL_STATE_ERROR); + is_active = !(to_state == CHANNEL_STATE_CLOSED || + to_state == CHANNEL_STATE_ERROR); + + /* Need to take off active list and put on finished list? */ + if (was_active && !is_active) { + if (active_channels) smartlist_remove(active_channels, chan); + if (!finished_channels) finished_channels = smartlist_new(); + smartlist_add(finished_channels, chan); + } + /* Need to put on active list? */ + else if (!was_active && is_active) { + if (finished_channels) smartlist_remove(finished_channels, chan); + if (!active_channels) active_channels = smartlist_new(); + smartlist_add(active_channels, chan); + } + + was_listening = (from_state == CHANNEL_STATE_LISTENING); + is_listening = (to_state == CHANNEL_STATE_LISTENING); + + /* Need to put on listening list? */ + if (!was_listening && is_listening) { + if (!listening_channels) listening_channels = smartlist_new(); + smartlist_add(listening_channels, chan); + } + /* Need to remove from listening list? */ + else if (was_listening && !is_listening) { + if (listening_channels) smartlist_remove(listening_channels, chan); + } + + if (!(chan->is_listener) && + !tor_digest_is_zero(chan->u.cell_chan.identity_digest)) { + /* Now we need to handle the identity map */ + was_in_id_map = !(from_state == CHANNEL_STATE_LISTENING || + from_state == CHANNEL_STATE_CLOSING || + from_state == CHANNEL_STATE_CLOSED || + from_state == CHANNEL_STATE_ERROR); + is_in_id_map = !(to_state == CHANNEL_STATE_LISTENING || + to_state == CHANNEL_STATE_CLOSING || + to_state == CHANNEL_STATE_CLOSED || + to_state == CHANNEL_STATE_ERROR); + + if (!was_in_id_map && is_in_id_map) channel_add_to_digest_map(chan); + else if (was_in_id_map && !is_in_id_map) + channel_remove_from_digest_map(chan); + } + } + + /* Tell circuits if we opened and stuff */ + if (to_state == CHANNEL_STATE_OPEN) channel_do_open_actions(chan); + + if (!(chan->is_listener) && + to_state == CHANNEL_STATE_OPEN) { + /* Check for queued cells to process */ + if (chan->u.cell_chan.cell_queue && + smartlist_len(chan->u.cell_chan.cell_queue) > 0) + channel_process_cells(chan); + if (chan->u.cell_chan.outgoing_queue && + smartlist_len(chan->u.cell_chan.outgoing_queue) > 0) + channel_flush_cells(chan); + } else if (to_state == CHANNEL_STATE_CLOSED || + to_state == CHANNEL_STATE_ERROR) { + /* Assert that all queues are empty */ + if (chan->is_listener) { + tor_assert(!(chan->u.listener.incoming_list) || + smartlist_len(chan->u.listener.incoming_list) == 0); + } else { + tor_assert(!(chan->u.cell_chan.cell_queue) || + smartlist_len(chan->u.cell_chan.cell_queue) == 0); + tor_assert(!(chan->u.cell_chan.outgoing_queue) || + smartlist_len(chan->u.cell_chan.outgoing_queue) == 0); + } + } +} + +/** + * Try to flush cells to the lower layer + * + * this is called by the lower layer to indicate that it wants more cells; + * it will try to write up to num_cells cells from the channel's cell queue or + * from circuits active on that channel, or as many as it has available if + * num_cells == -1. + * + * @param chan Channel to flush from + * @param num_cells Maximum number of cells to flush, or -1 for unlimited + * @return Number of cells flushed + */ + +#define MAX_CELLS_TO_GET_FROM_CIRCUITS_FOR_UNLIMITED 256 + +ssize_t +channel_flush_some_cells(channel_t *chan, ssize_t num_cells) +{ + unsigned int unlimited = 0; + ssize_t flushed = 0; + int num_cells_from_circs; + + tor_assert(chan); + tor_assert(!(chan->is_listener)); + + if (num_cells < 0) unlimited = 1; + if (!unlimited && num_cells <= flushed) goto done; + + /* If we aren't in CHANNEL_STATE_OPEN, nothing goes through */ + if (chan->state == CHANNEL_STATE_OPEN) { + /* Try to flush as much as we can that's already queued */ + flushed += channel_flush_some_cells_from_outgoing_queue(chan, + (unlimited ? -1 : num_cells - flushed)); + if (!unlimited && num_cells <= flushed) goto done; + + if (chan->u.cell_chan.active_circuits) { + /* Try to get more cells from any active circuits */ + num_cells_from_circs = + channel_flush_from_first_active_circuit(chan, + (unlimited ? MAX_CELLS_TO_GET_FROM_CIRCUITS_FOR_UNLIMITED : + (num_cells - flushed))); + + /* If it claims we got some, process the queue again */ + if (num_cells_from_circs > 0) { + flushed += channel_flush_some_cells_from_outgoing_queue(chan, + (unlimited ? -1 : num_cells - flushed)); + } + } + } + + done: + return flushed; +} + +/** + * Flush cells from just the channel's out going cell queue + * + * This gets called from channel_flush_some_cells() above to flush cells + * just from the queue without trying for active_circuits. + * + * @param chan Channel to flush from + * @param num_cells Maximum number of cells to flush, or -1 for unlimited + * @return Number of cells flushed + */ + +static ssize_t +channel_flush_some_cells_from_outgoing_queue(channel_t *chan, + ssize_t num_cells) +{ + unsigned int unlimited = 0; + ssize_t flushed = 0; + cell_queue_entry_t *q = NULL; + + tor_assert(chan); + tor_assert(!(chan->is_listener)); + tor_assert(chan->u.cell_chan.write_cell); + tor_assert(chan->u.cell_chan.write_packed_cell); + tor_assert(chan->u.cell_chan.write_var_cell); + + if (num_cells < 0) unlimited = 1; + if (!unlimited && num_cells <= flushed) return 0; + + /* If we aren't in CHANNEL_STATE_OPEN, nothing goes through */ + if (chan->state == CHANNEL_STATE_OPEN) { + while ((unlimited || num_cells > flushed) && + (chan->u.cell_chan.outgoing_queue && + (smartlist_len(chan->u.cell_chan.outgoing_queue) > 0))) { + /* + * Ewww, smartlist_del_keeporder() is O(n) in list length; maybe a + * a linked list would make more sense for the queue. + */ + + /* Get the head of the queue */ + q = smartlist_get(chan->u.cell_chan.outgoing_queue, 0); + /* That shouldn't happen; bail out */ + if (q) { + /* + * Okay, we have a good queue entry, try to give it to the lower + * layer. + */ + switch (q->type) { + case CELL_QUEUE_FIXED: + if (q->u.fixed.cell) { + if (chan->u.cell_chan.write_cell(chan, + q->u.fixed.cell)) { + tor_free(q); + ++flushed; + channel_timestamp_xmit(chan); + } + /* Else couldn't write it; leave it on the queue */ + } else { + /* This shouldn't happen */ + log_info(LD_CHANNEL, + "Saw broken cell queue entry of type CELL_QUEUE_FIXED " + "with no cell on channel %p.", + chan); + /* Throw it away */ + tor_free(q); + } + break; + case CELL_QUEUE_PACKED: + if (q->u.packed.packed_cell) { + if (chan->u.cell_chan.write_packed_cell(chan, + q->u.packed.packed_cell)) { + tor_free(q); + ++flushed; + channel_timestamp_xmit(chan); + } + /* Else couldn't write it; leave it on the queue */ + } else { + /* This shouldn't happen */ + log_info(LD_CHANNEL, + "Saw broken cell queue entry of type CELL_QUEUE_PACKED " + "with no cell on channel %p.", + chan); + /* Throw it away */ + tor_free(q); + } + break; + case CELL_QUEUE_VAR: + if (q->u.var.var_cell) { + if (chan->u.cell_chan.write_var_cell(chan, + q->u.var.var_cell)) { + tor_free(q); + ++flushed; + channel_timestamp_xmit(chan); + } + /* Else couldn't write it; leave it on the queue */ + } else { + /* This shouldn't happen */ + log_info(LD_CHANNEL, + "Saw broken cell queue entry of type CELL_QUEUE_VAR " + "with no cell on channel %p.", + chan); + /* Throw it away */ + tor_free(q); + } + break; + default: + /* Unknown type, log and free it */ + log_info(LD_CHANNEL, + "Saw an unknown cell queue entry type %d on channel %p; " + "ignoring it. Someone should fix this.", + q->type, chan); + tor_free(q); /* tor_free() NULLs it out */ + } + } else { + /* This shouldn't happen; log and throw it away */ + log_info(LD_CHANNEL, + "Saw a NULL entry in the outgoing cell queue on channel %p; " + "this is definitely a bug.", + chan); + /* q is already NULL, so we know to delete that queue entry */ + } + + /* if q got NULLed out, we used it and should remove the queue entry */ + if (!q) smartlist_del_keeporder(chan->u.cell_chan.outgoing_queue, 0); + /* No cell removed from list, so we can't go on any further */ + else break; + } + } + + /* Did we drain the queue? */ + if (!(chan->u.cell_chan.outgoing_queue) || + smartlist_len(chan->u.cell_chan.outgoing_queue) == 0) { + /* Timestamp it */ + channel_timestamp_drained(chan); + } + + return flushed; +} + +/** + * Try to flush as many cells as we possibly can from the queue + * + * This tries to flush as many cells from the queue as the lower layer + * will take. It just calls channel_flush_some_cells_from_outgoing_queue() + * in unlimited mode. + * + * @param chan Channel to flush + */ + +void +channel_flush_cells(channel_t *chan) +{ + channel_flush_some_cells_from_outgoing_queue(chan, -1); +} + +/** + * Check if any cells are available + * + * This gets used from the lower layer to check if any more cells are + * available. + * + * @param chan Channel to check on + * @return 1 if cells are available, 0 otherwise + */ + +int +channel_more_to_flush(channel_t *chan) +{ + tor_assert(chan); + tor_assert(!(chan->is_listener)); + + /* Check if we have any queued */ + if (chan->u.cell_chan.cell_queue && + smartlist_len(chan->u.cell_chan.cell_queue) > 0) return 1; + + /* Check if any circuits would like to queue some */ + if (chan->u.cell_chan.active_circuits) return 1; + + /* Else no */ + return 0; +} + +/** + * Notify the channel we're done flushing the output in the lower layer + * + * Connection.c will call this when we've flushed the output; there's some + * dirreq-related maintenance to do. + * + * @param chan Channel to notify + */ + +void +channel_notify_flushed(channel_t *chan) +{ + tor_assert(chan); + tor_assert(!(chan->is_listener)); + + if (chan->u.cell_chan.dirreq_id != 0) + geoip_change_dirreq_state(chan->u.cell_chan.dirreq_id, + DIRREQ_TUNNELED, + DIRREQ_CHANNEL_BUFFER_FLUSHED); +} + +/** + * Process the queue of incoming channels on a listener + * + * Use a listener's registered callback to process as many entries in the + * queue of incoming channels as possible. + * + * @param listener Pointer to a listening channel. + */ + +void +channel_process_incoming(channel_t *listener) +{ + tor_assert(listener); + tor_assert(listener->is_listener); + /* + * CHANNEL_STATE_CLOSING permitted because we drain the queue while + * closing a listener. + */ + tor_assert(listener->state == CHANNEL_STATE_LISTENING || + listener->state == CHANNEL_STATE_CLOSING); + tor_assert(listener->u.listener.listener); + + log_debug(LD_CHANNEL, + "Processing queue of incoming connections for listening " + "channel %p (global ID %lu)", + listener, listener->global_identifier); + + if (!(listener->u.listener.incoming_list)) return; + + SMARTLIST_FOREACH_BEGIN(listener->u.listener.incoming_list, + channel_t *, chan) { + tor_assert(chan); + tor_assert(!(chan->is_listener)); + + log_debug(LD_CHANNEL, + "Handling incoming connection %p (%lu) for listener %p (%lu)", + chan, chan->global_identifier, + listener, listener->global_identifier); + /* Make sure this is set correctly */ + channel_mark_incoming(chan); + listener->u.listener.listener(listener, chan); + SMARTLIST_DEL_CURRENT(listener->u.listener.incoming_list, chan); + } SMARTLIST_FOREACH_END(chan); + + tor_assert(smartlist_len(listener->u.listener.incoming_list) == 0); + smartlist_free(listener->u.listener.incoming_list); + listener->u.listener.incoming_list = NULL; +} + +/** + * Take actions required when a channel becomes open + * + * Handle actions we should do when we know a channel is open; a lot of + * this comes from the old connection_or_set_state_open() of connection_or.c. + * + * Because of this mechanism, future channel_t subclasses should take care + * not to change a channel to from CHANNEL_STATE_OPENING to CHANNEL_STATE_OPEN + * until there is positive confirmation that the network is operational. + * In particular, anything UDP-based should not make this transition until a + * packet is received from the other side. + * + * @param chan Channel that has become open + */ + +void +channel_do_open_actions(channel_t *chan) +{ + tor_addr_t remote_addr; + int started_here, not_using = 0; + time_t now = time(NULL); + + tor_assert(chan); + tor_assert(!(chan->is_listener)); + + started_here = channel_is_outgoing(chan); + + if (started_here) { + circuit_build_times_network_is_live(&circ_times); + rep_hist_note_connect_succeeded(chan->u.cell_chan.identity_digest, now); + if (entry_guard_register_connect_status( + chan->u.cell_chan.identity_digest, 1, 0, now) < 0) { + /* Close any circuits pending on this channel. We leave it in state + * 'open' though, because it didn't actually *fail* -- we just + * chose not to use it. */ + log_debug(LD_OR, + "New entry guard was reachable, but closing this " + "connection so we can retry the earlier entry guards."); + circuit_n_chan_done(chan, 0); + not_using = 1; + } + router_set_status(chan->u.cell_chan.identity_digest, 1); + } else { + /* only report it to the geoip module if it's not a known router */ + if (!router_get_by_id_digest(chan->u.cell_chan.identity_digest)) { + if (channel_get_addr_if_possible(chan, &remote_addr)) { + geoip_note_client_seen(GEOIP_CLIENT_CONNECT, &remote_addr, + now); + } + /* Otherwise the underlying transport can't tell us this, so skip it */ + } + } + + if (!not_using) circuit_n_chan_done(chan, 1); +} + +/** + * Queue an incoming channel on a listener + * + * Internal and subclass use only function to queue an incoming channel from + * a listening one. A subclass of channel_t should call this when a new + * incoming channel is created. + * + * @param listener Listening channel to queue on + * @param incoming New incoming channel + */ + +void +channel_queue_incoming(channel_t *listener, channel_t *incoming) +{ + int need_to_queue = 0; + + tor_assert(listener); + tor_assert(listener->is_listener); + tor_assert(listener->state == CHANNEL_STATE_LISTENING); + tor_assert(incoming); + tor_assert(!(incoming->is_listener)); + /* + * Other states are permitted because subclass might process activity + * on a channel at any time while it's queued, but a listener returning + * another listener makes no sense. + */ + tor_assert(incoming->state != CHANNEL_STATE_LISTENING); + + log_debug(LD_CHANNEL, + "Queueing incoming channel %p on listening channel %p", + incoming, listener); + + /* Do we need to queue it, or can we just call the listener right away? */ + if (!(listener->u.listener.listener)) need_to_queue = 1; + if (listener->u.listener.incoming_list && + (smartlist_len(listener->u.listener.incoming_list) > 0)) + need_to_queue = 1; + + /* If we need to queue and have no queue, create one */ + if (need_to_queue && !(listener->u.listener.incoming_list)) { + listener->u.listener.incoming_list = smartlist_new(); + } + + /* If we don't need to queue, process it right away */ + if (!need_to_queue) { + tor_assert(listener->u.listener.listener); + listener->u.listener.listener(listener, incoming); + } + /* + * Otherwise, we need to queue; queue and then process the queue if + * we can. + */ + else { + tor_assert(listener->u.listener.incoming_list); + smartlist_add(listener->u.listener.incoming_list, incoming); + if (listener->u.listener.listener) channel_process_incoming(listener); + } +} + +/** + * Process queued incoming cells + * + * Process as many queued cells as we can from the incoming + * cell queue. + * + * @param chan Channel to process incoming cell queue on + */ + +void +channel_process_cells(channel_t *chan) +{ + tor_assert(chan); + tor_assert(!(chan->is_listener)); + tor_assert(chan->state == CHANNEL_STATE_CLOSING || + chan->state == CHANNEL_STATE_MAINT || + chan->state == CHANNEL_STATE_OPEN); + + log_debug(LD_CHANNEL, + "Processing as many incoming cells as we can for channel %p", + chan); + + /* Nothing we can do if we have no registered cell handlers */ + if (!(chan->u.cell_chan.cell_handler || + chan->u.cell_chan.var_cell_handler)) return; + /* Nothing we can do if we have no cells */ + if (!(chan->u.cell_chan.cell_queue)) return; + + /* + * Process cells until we're done or find one we have no current handler + * for. + */ + SMARTLIST_FOREACH_BEGIN(chan->u.cell_chan.cell_queue, + cell_queue_entry_t *, q) { + tor_assert(q); + tor_assert(q->type == CELL_QUEUE_FIXED || + q->type == CELL_QUEUE_VAR); + + if (q->type == CELL_QUEUE_FIXED && + chan->u.cell_chan.cell_handler) { + /* Handle a fixed-length cell */ + tor_assert(q->u.fixed.cell); + log_debug(LD_CHANNEL, + "Processing incoming cell_t %p for channel %p", + q->u.fixed.cell, chan); + chan->u.cell_chan.cell_handler(chan, q->u.fixed.cell); + SMARTLIST_DEL_CURRENT(chan->u.cell_chan.cell_queue, q); + tor_free(q); + } else if (q->type == CELL_QUEUE_VAR && + chan->u.cell_chan.var_cell_handler) { + /* Handle a variable-length cell */ + tor_assert(q->u.var.var_cell); + log_debug(LD_CHANNEL, + "Processing incoming var_cell_t %p for channel %p", + q->u.var.var_cell, chan); + chan->u.cell_chan.var_cell_handler(chan, q->u.var.var_cell); + SMARTLIST_DEL_CURRENT(chan->u.cell_chan.cell_queue, q); + tor_free(q); + } else { + /* Can't handle this one */ + break; + } + } SMARTLIST_FOREACH_END(q); + + /* If the list is empty, free it */ + if (smartlist_len(chan->u.cell_chan.cell_queue) == 0 ) { + smartlist_free(chan->u.cell_chan.cell_queue); + chan->u.cell_chan.cell_queue = NULL; + } +} + +/** + * Queue incoming cell + * + * This should be called by a channel_t subclass to queue an incoming fixed- + * length cell for processing, and process it if possible. + * + * @param chan Channel the cell is arriving on + * @param cell Incoming cell to queue and process + */ + +void +channel_queue_cell(channel_t *chan, cell_t *cell) +{ + int need_to_queue = 0; + cell_queue_entry_t *q; + + tor_assert(chan); + tor_assert(!(chan->is_listener)); + tor_assert(cell); + tor_assert(chan->state == CHANNEL_STATE_OPEN); + + /* Do we need to queue it, or can we just call the handler right away? */ + if (!(chan->u.cell_chan.cell_handler)) need_to_queue = 1; + if (chan->u.cell_chan.cell_queue && + (smartlist_len(chan->u.cell_chan.cell_queue) > 0)) + need_to_queue = 1; + + /* If we need to queue and have no queue, create one */ + if (need_to_queue && !(chan->u.cell_chan.cell_queue)) { + chan->u.cell_chan.cell_queue = smartlist_new(); + } + + /* Timestamp for receiving */ + channel_timestamp_recv(chan); + + /* If we don't need to queue we can just call cell_handler */ + if (!need_to_queue) { + tor_assert(chan->u.cell_chan.cell_handler); + log_debug(LD_CHANNEL, + "Directly handling incoming cell_t %p for channel %p", + cell, chan); + chan->u.cell_chan.cell_handler(chan, cell); + } else { + /* Otherwise queue it and then process the queue if possible. */ + tor_assert(chan->u.cell_chan.cell_queue); + q = tor_malloc(sizeof(*q)); + q->type = CELL_QUEUE_FIXED; + q->u.fixed.cell = cell; + log_debug(LD_CHANNEL, + "Queueing incoming cell_t %p for channel %p", + cell, chan); + smartlist_add(chan->u.cell_chan.cell_queue, q); + if (chan->u.cell_chan.cell_handler || + chan->u.cell_chan.var_cell_handler) { + channel_process_cells(chan); + } + } +} + +/** + * Queue incoming variable-length cell + * + * This should be called by a channel_t subclass to queue an incoming + * variable-length cell for processing, and process it if possible. + * + * @param chan Channel the cell is arriving on + * @param var_cell Incoming cell to queue and process + */ + +void +channel_queue_var_cell(channel_t *chan, var_cell_t *var_cell) +{ + int need_to_queue = 0; + cell_queue_entry_t *q; + + tor_assert(chan); + tor_assert(!(chan->is_listener)); + tor_assert(var_cell); + tor_assert(chan->state == CHANNEL_STATE_OPEN); + + /* Do we need to queue it, or can we just call the handler right away? */ + if (!(chan->u.cell_chan.var_cell_handler)) need_to_queue = 1; + if (chan->u.cell_chan.cell_queue && + (smartlist_len(chan->u.cell_chan.cell_queue) > 0)) + need_to_queue = 1; + + /* If we need to queue and have no queue, create one */ + if (need_to_queue && !(chan->u.cell_chan.cell_queue)) { + chan->u.cell_chan.cell_queue = smartlist_new(); + } + + /* Timestamp for receiving */ + channel_timestamp_recv(chan); + + /* If we don't need to queue we can just call cell_handler */ + if (!need_to_queue) { + tor_assert(chan->u.cell_chan.var_cell_handler); + log_debug(LD_CHANNEL, + "Directly handling incoming var_cell_t %p for channel %p", + var_cell, chan); + chan->u.cell_chan.var_cell_handler(chan, var_cell); + } else { + /* Otherwise queue it and then process the queue if possible. */ + tor_assert(chan->u.cell_chan.cell_queue); + q = tor_malloc(sizeof(*q)); + q->type = CELL_QUEUE_VAR; + q->u.var.var_cell = var_cell; + log_debug(LD_CHANNEL, + "Queueing incoming var_cell_t %p for channel %p", + var_cell, chan); + smartlist_add(chan->u.cell_chan.cell_queue, q); + if (chan->u.cell_chan.cell_handler || + chan->u.cell_chan.var_cell_handler) { + channel_process_cells(chan); + } + } +} + +/** + * Send destroy cell on a channel + * + * Write a destroy cell with circ ID circ_id and reason reason + * onto channel chan. Don't perform range-checking on reason: + * we may want to propagate reasons from other cells. + * + * @param circ_id Circuit ID to destroy + * @param chan Channel to send on + * @param reason Reason code + * @return Always 0 + */ + +int +channel_send_destroy(circid_t circ_id, channel_t *chan, int reason) +{ + cell_t cell; + + tor_assert(chan); + tor_assert(!(chan->is_listener)); + + memset(&cell, 0, sizeof(cell_t)); + cell.circ_id = circ_id; + cell.command = CELL_DESTROY; + cell.payload[0] = (uint8_t) reason; + log_debug(LD_OR,"Sending destroy (circID %d).", circ_id); + + channel_write_cell(chan, &cell); + + return 0; +} + +/** + * Channel cleanup + * + * This gets called periodically from run_scheduled_events() in main.c; + * it cleans up after closed channels. + */ + +void +channel_run_cleanup(void) +{ + channel_t *tmp = NULL; + + /* Check if we need to do anything */ + if (!finished_channels || smartlist_len(finished_channels) == 0) return; + + /* Iterate through finished_channels and get rid of them */ + SMARTLIST_FOREACH_BEGIN(finished_channels, channel_t *, curr) { + tmp = curr; + /* Remove it from the list */ + SMARTLIST_DEL_CURRENT(finished_channels, curr); + /* Also unregister it */ + channel_unregister(tmp); + /* ... and free it */ + channel_free(tmp); + } SMARTLIST_FOREACH_END(curr); +} + +/** + * Close all channels and free everything + * + * This gets called from tor_free_all() in main.c to clean up on exit. + * It will close all registered channels and free associated storage, + * then free the all_channels, active_channels, listening_channels and + * finished_channels lists and also channel_identity_map. + */ + +void +channel_free_all(void) +{ + channel_t *tmp = NULL; + + log_debug(LD_CHANNEL, + "Shutting down channels..."); + + /* First, let's go for finished channels */ + if (finished_channels) { + SMARTLIST_FOREACH_BEGIN(finished_channels, channel_t *, curr) { + tmp = curr; + /* Remove it from the list */ + SMARTLIST_DEL_CURRENT(finished_channels, curr); + /* Deregister and free it */ + tor_assert(tmp); + log_debug(LD_CHANNEL, + "Cleaning up finished channel %p (ID %lu) in state %s (%d)", + tmp, tmp->global_identifier, + channel_state_to_string(tmp->state), tmp->state); + channel_unregister(tmp); + channel_free(tmp); + } SMARTLIST_FOREACH_END(curr); + + smartlist_free(finished_channels); + finished_channels = NULL; + tmp = NULL; + } + + /* Now the listeners */ + if (listening_channels) { + SMARTLIST_FOREACH_BEGIN(listening_channels, channel_t *, curr) { + tmp = curr; + /* Remove it from the list */ + SMARTLIST_DEL_CURRENT(listening_channels, curr); + /* Close, deregister and free it */ + tor_assert(tmp); + log_debug(LD_CHANNEL, + "Cleaning up listening channel %p (ID %lu) in state %s (%d)", + tmp, tmp->global_identifier, + channel_state_to_string(tmp->state), tmp->state); + /* + * We have to unregister first so we don't put it in finished_channels + * and allocate that again on close. + */ + channel_unregister(tmp); + channel_request_close(tmp); + channel_force_free(tmp); + } SMARTLIST_FOREACH_END(curr); + + smartlist_free(listening_channels); + listening_channels = NULL; + } + + /* Now all active channels */ + if (active_channels) { + SMARTLIST_FOREACH_BEGIN(active_channels, channel_t *, curr) { + tmp = curr; + /* Remove it from the list */ + SMARTLIST_DEL_CURRENT(active_channels, curr); + /* Close, deregister and free it */ + tor_assert(tmp); + log_debug(LD_CHANNEL, + "Cleaning up active channel %p (ID %lu) in state %s (%d)", + tmp, tmp->global_identifier, + channel_state_to_string(tmp->state), tmp->state); + /* + * We have to unregister first so we don't put it in finished_channels + * and allocate that again on close. + */ + channel_unregister(tmp); + channel_request_close(tmp); + channel_force_free(tmp); + } SMARTLIST_FOREACH_END(curr); + + smartlist_free(active_channels); + active_channels = NULL; + } + + /* Now all channels, in case any are left over */ + if (all_channels) { + SMARTLIST_FOREACH_BEGIN(all_channels, channel_t *, curr) { + tmp = curr; + /* Remove it from the list */ + SMARTLIST_DEL_CURRENT(all_channels, curr); + /* Close, deregister and free it */ + tor_assert(tmp); + log_debug(LD_CHANNEL, + "Cleaning up leftover channel %p (ID %lu) in state %s (%d)", + tmp, tmp->global_identifier, + channel_state_to_string(tmp->state), tmp->state); + channel_unregister(tmp); + if (!(tmp->state == CHANNEL_STATE_CLOSING || + tmp->state == CHANNEL_STATE_CLOSED || + tmp->state == CHANNEL_STATE_ERROR)) { + channel_request_close(tmp); + } + channel_force_free(tmp); + } SMARTLIST_FOREACH_END(curr); + + smartlist_free(all_channels); + all_channels = NULL; + } + + /* Now free channel_identity_map */ + if (channel_identity_map) { + log_debug(LD_CHANNEL, + "Freeing channel_identity_map"); + /* Geez, anything still left over just won't die ... let it leak then */ + digestmap_free(channel_identity_map, NULL); + channel_identity_map = NULL; + } + + log_debug(LD_CHANNEL, + "Done cleaning up after channels"); +} + +/** + * Connect to a given addr/port/digest + * + * This sets up a new outgoing channel; in the future if multiple + * channel_t subclasses are available, this is where the selection policy + * should go. It may also be desirable to fold port into tor_addr_t + * or make a new type including a tor_addr_t and port, so we have a + * single abstract object encapsulating all the protocol details of + * how to contact an OR. + * + * @param addr Address of remote node to establish a channel to + * @param port ORport of remote OR + * @param id_digest Identity digest of remote OR + * @return New channel, or NULL if failure + */ + +channel_t * +channel_connect(const tor_addr_t *addr, uint16_t port, + const char *id_digest) +{ + return channel_tls_connect(addr, port, id_digest); +} + +/** + * Decide which of two channels to prefer for extending a circuit + * + * This function is called while extending a circuit and returns true iff + * a is 'better' than b. The most important criterion here is that a + * canonical channel is always better than a non-canonical one, but the + * number of circuits and the age are used as tie-breakers. + * + * This is based on the former connection_or_is_better() of connection_or.c + * + * @param now Current time to use for deciding grace period for new channels + * @param a Channel A for comparison + * @param b Channel B for comparison + * @param forgive_new_connections Whether to use grace period for new channels + * @return 1 iff a is better than b + */ + +int +channel_is_better(time_t now, channel_t *a, channel_t *b, + int forgive_new_connections) +{ + int a_grace, b_grace; + int a_is_canonical, b_is_canonical; + int a_has_circs, b_has_circs; + + /* + * Do not definitively deprecate a new channel with no circuits on it + * until this much time has passed. + */ +#define NEW_CHAN_GRACE_PERIOD (15*60) + + tor_assert(a); + tor_assert(b); + tor_assert(!(a->is_listener)); + tor_assert(!(b->is_listener)); + + /* Check if one is canonical and the other isn't first */ + a_is_canonical = channel_is_canonical(a); + b_is_canonical = channel_is_canonical(b); + + if (a_is_canonical && !b_is_canonical) return 1; + if (!a_is_canonical && b_is_canonical) return 0; + + /* + * Okay, if we're here they tied on canonicity. Next we check if + * they have any circuits, and if one does and the other doesn't, + * we prefer the one that does, unless we are forgiving and the + * one that has no circuits is in its grace period. + */ + + a_has_circs = (a->u.cell_chan.n_circuits > 0); + b_has_circs = (b->u.cell_chan.n_circuits > 0); + a_grace = (forgive_new_connections && + (now < channel_when_created(a) + NEW_CHAN_GRACE_PERIOD)); + b_grace = (forgive_new_connections && + (now < channel_when_created(b) + NEW_CHAN_GRACE_PERIOD)); + + if (a_has_circs && !b_has_circs && !b_grace) return 1; + if (!a_has_circs && b_has_circs && !a_grace) return 0; + + /* They tied on circuits too; just prefer whichever is newer */ + + if (channel_when_created(a) > channel_when_created(b)) return 1; + else return 0; +} + +/** + * Get a channel to extend a circuit + * + * Pick a suitable channel to extend a circuit to given the desired digest + * the address we believe is correct for that digest; this tries to see + * if we already have one for the requested endpoint, but if there is no good + * channel, set *msg_out to a message describing the channel's state + * and our next action, and set *launch_out to a boolean indicated whether + * the caller should try to launch a new channel with channel_connect(). + * + * @param digest Endpoint digest we want + * @param target_addr Endpoint address we want + * @param msg_out Write out status message here if we fail + * @param launch_out Write 1 here if caller should try to connect a new + * channel. + * @return Pointer to selected channel, or NULL if none available + */ + +channel_t * +channel_get_for_extend(const char *digest, + const tor_addr_t *target_addr, + const char **msg_out, + int *launch_out) +{ + channel_t *chan, *best = NULL; + int n_inprogress_goodaddr = 0, n_old = 0; + int n_noncanonical = 0, n_possible = 0; + time_t now = approx_time(); + + tor_assert(msg_out); + tor_assert(launch_out); + + if (!channel_identity_map) { + *msg_out = "Router not connected (nothing is). Connecting."; + *launch_out = 1; + return NULL; + } + + chan = channel_find_by_remote_digest(digest); + + /* Walk the list, unrefing the old one and refing the new at each + * iteration. + */ + for (; chan; chan = channel_next_with_digest(chan)) { + tor_assert(!(chan->is_listener)); + tor_assert(tor_memeq(chan->u.cell_chan.identity_digest, + digest, DIGEST_LEN)); + + if (chan->state == CHANNEL_STATE_CLOSING || + chan->state == CHANNEL_STATE_CLOSED || + chan->state == CHANNEL_STATE_ERROR || + chan->state == CHANNEL_STATE_LISTENING) + continue; + + /* Never return a channel on which the other end appears to be + * a client. */ + if (channel_is_client(chan)) { + continue; + } + + /* Never return a non-open connection. */ + if (chan->state != CHANNEL_STATE_OPEN) { + /* If the address matches, don't launch a new connection for this + * circuit. */ + if (!channel_matches_target_addr_for_extend(chan, target_addr)) + ++n_inprogress_goodaddr; + continue; + } + + /* Never return a connection that shouldn't be used for circs. */ + if (channel_is_bad_for_new_circs(chan)) { + ++n_old; + continue; + } + + /* Never return a non-canonical connection using a recent link protocol + * if the address is not what we wanted. + * + * The channel_is_canonical_is_reliable() function asks the lower layer + * if we should trust channel_is_canonical(). The below is from the + * comments of the old circuit_or_get_for_extend() and applies when + * the lower-layer transport is channel_tls_t. + * + * (For old link protocols, we can't rely on is_canonical getting + * set properly if we're talking to the right address, since we might + * have an out-of-date descriptor, and we will get no NETINFO cell to + * tell us about the right address.) + */ + if (!channel_is_canonical(chan) && + channel_is_canonical_is_reliable(chan) && + !channel_matches_target_addr_for_extend(chan, target_addr)) { + ++n_noncanonical; + continue; + } + + ++n_possible; + + if (!best) { + best = chan; /* If we have no 'best' so far, this one is good enough. */ + continue; + } + + if (channel_is_better(now, chan, best, 0)) + best = chan; + } + + if (best) { + *msg_out = "Connection is fine; using it."; + *launch_out = 0; + return best; + } else if (n_inprogress_goodaddr) { + *msg_out = "Connection in progress; waiting."; + *launch_out = 0; + return NULL; + } else if (n_old || n_noncanonical) { + *msg_out = "Connections all too old, or too non-canonical. " + " Launching a new one."; + *launch_out = 1; + return NULL; + } else { + *msg_out = "Not connected. Connecting."; + *launch_out = 1; + return NULL; + } +} + +/** + * Return text description of the remote endpoint + * + * This function return a test provided by the lower layer of the remote + * endpoint for this channel; it should specify the actual address connected + * to/from. + * + * @param chan Channel to describe + * @return Pointer to string description + */ + +const char * +channel_get_actual_remote_descr(channel_t *chan) +{ + tor_assert(chan); + tor_assert(!(chan->is_listener)); + tor_assert(chan->u.cell_chan.get_remote_descr); + + /* Param 1 indicates the actual description */ + return chan->u.cell_chan.get_remote_descr(chan, 1); +} + +/** + * Return text description of the remote endpoint canonical address + * + * This function return a test provided by the lower layer of the remote + * endpoint for this channel; it should use the known canonical address for + * this OR's identity digest if possible. + * + * @param chan Channel to describe + * @return Pointer to string description + */ + +const char * +channel_get_canonical_remote_descr(channel_t *chan) +{ + tor_assert(chan); + tor_assert(!(chan->is_listener)); + tor_assert(chan->u.cell_chan.get_remote_descr); + + /* Param 0 indicates the canonicalized description */ + return chan->u.cell_chan.get_remote_descr(chan, 0); +} + +/** + * Get remote address if possible + * + * Write the remote address out to a tor_addr_t if the underlying transport + * supports this operation. + * + * @param chan Channel to request remote address from + * @param addr_out Write the address out here + * @return 1 if successful, 0 if not + */ + +int +channel_get_addr_if_possible(channel_t *chan, tor_addr_t *addr_out) +{ + tor_assert(chan); + tor_assert(!(chan->is_listener)); + tor_assert(addr_out); + + if (chan->u.cell_chan.get_remote_addr) + return chan->u.cell_chan.get_remote_addr(chan, addr_out); + /* Else no support, method not implemented */ + else return 0; +} + +/** + * Check if there are outgoing queue writes on this channel + * + * Indicate if either we have queued cells, or if not, whether the underlying + * lower-layer transport thinks it has an output queue. + * + * @param chan Channel to query + * @return 1 if there are queued writes, 0 otherwise + */ + +int +channel_has_queued_writes(channel_t *chan) +{ + int has_writes = 0; + + tor_assert(chan); + tor_assert(!(chan->is_listener)); + tor_assert(chan->u.cell_chan.has_queued_writes); + + if (chan->u.cell_chan.outgoing_queue && + smartlist_len(chan->u.cell_chan.outgoing_queue) > 0) { + has_writes = 1; + } else { + /* Check with the lower layer */ + has_writes = chan->u.cell_chan.has_queued_writes(chan); + } + + return has_writes; +} + +/** + * Check the is_bad_for_new_circs flag + * + * This function returns the is_bad_for_new_circs flag of the specified + * channel. + * + * @param chan Channel to get flag on + * @return Flag value + */ + +int +channel_is_bad_for_new_circs(channel_t *chan) +{ + tor_assert(chan); + tor_assert(!(chan->is_listener)); + + return chan->u.cell_chan.is_bad_for_new_circs; +} + +/** + * Mark a channel as bad for new circuits + * + * Set the is_bad_for_new_circs_flag on chan. + * + * @param chan Channel to mark + */ + +void +channel_mark_bad_for_new_circs(channel_t *chan) +{ + tor_assert(chan); + tor_assert(!(chan->is_listener)); + + chan->u.cell_chan.is_bad_for_new_circs = 1; +} + +/** + * Get the client flag + * + * This returns the client flag of a channel, which will be set if + * command_process_create_cell() in command.c thinks this is a connection + * from a client. + * + * @param chan Channel to query flag + * @return Flag value + */ + +int +channel_is_client(channel_t *chan) +{ + tor_assert(chan); + tor_assert(!(chan->is_listener)); + + return chan->u.cell_chan.is_client; +} + +/** + * Set the client flag + * + * Mark a channel as being from a client + * + * @param chan Channel to mark + */ + +void +channel_mark_client(channel_t *chan) +{ + tor_assert(chan); + tor_assert(!(chan->is_listener)); + + chan->u.cell_chan.is_client = 1; +} + +/** + * Get the canonical flag for a channel + * + * This returns the is_canonical for a channel; this flag is determined by + * the lower layer and can't be set in a transport-independent way. + * + * @param chan Channel to query + * @return Flag value + */ + +int +channel_is_canonical(channel_t *chan) +{ + tor_assert(chan); + tor_assert(!(chan->is_listener)); + tor_assert(chan->u.cell_chan.is_canonical); + + return chan->u.cell_chan.is_canonical(chan, 0); +} + +/** + * Test if the canonical flag is reliable + * + * This function asks if the lower layer thinks it's safe to trust the + * result of channel_is_canonical() + * + * @param chan Channel to query + * @return 1 if the lower layer thinks the is_canonical flag is reliable, 0 + * otherwise. + */ + +int +channel_is_canonical_is_reliable(channel_t *chan) +{ + tor_assert(chan); + tor_assert(!(chan->is_listener)); + tor_assert(chan->u.cell_chan.is_canonical); + + return chan->u.cell_chan.is_canonical(chan, 1); +} + +/** + * Test incoming flag + * + * This function gets the incoming flag; this is set when a listener spawns + * a channel. If this returns true the channel was remotely initiated. + * + * @param chan Channel to query + * @return Flag value + */ + +int +channel_is_incoming(channel_t *chan) +{ + tor_assert(chan); + tor_assert(!(chan->is_listener)); + + return chan->u.cell_chan.is_incoming; +} + +/** + * Set the incoming flag + * + * This function is called when a channel arrives on a listening channel + * to mark it as incoming. + * + * @param chan Channel to mark + */ + +void +channel_mark_incoming(channel_t *chan) +{ + tor_assert(chan); + tor_assert(!(chan->is_listener)); + + chan->u.cell_chan.is_incoming = 1; +} + +/** + * Test local flag + * + * This function gets the local flag; the lower layer should set this when + * setting up the channel if is_local_addr() is true for all of the + * destinations it will communicate with on behalf of this channel. It's + * used to decide whether to declare the network reachable when seeing incoming + * traffic on the channel. + * + * @param chan Channel to query + * @return Flag value + */ + +int +channel_is_local(channel_t *chan) +{ + tor_assert(chan); + tor_assert(!(chan->is_listener)); + + return chan->u.cell_chan.is_local; +} + +/** + * Set the local flag + * + * This internal-only function should be called by the lower layer if the + * channel is to a local address. See channel_is_local() above or the + * description of the is_local bit in channel.h + * + * @param chan Channel to mark + */ + +void +channel_mark_local(channel_t *chan) +{ + tor_assert(chan); + tor_assert(!(chan->is_listener)); + + chan->u.cell_chan.is_local = 1; +} + +/** + * Test outgoing flag + * + * This function gets the outgoing flag; this is the inverse of the incoming + * bit set when a listener spawns a channel. If this returns true the channel + * was locally initiated. + * + * @param chan Channel to query + * @return Flag value + */ + +int +channel_is_outgoing(channel_t *chan) +{ + tor_assert(chan); + tor_assert(!(chan->is_listener)); + + return !(chan->u.cell_chan.is_incoming); +} + +/** + * Mark a channel as outgoing + * + * This function clears the incoming flag and thus marks a channel as + * outgoing. + * + * @param chan Channel to mark + */ + +void +channel_mark_outgoing(channel_t *chan) +{ + tor_assert(chan); + tor_assert(!(chan->is_listener)); + + chan->u.cell_chan.is_incoming = 0; +} + +/********************* + * Timestamp updates * + ********************/ + +/** + * Update the created timestamp + * + * This updates the channel's created timestamp and should only be called + * from channel_init(). + * + * @param chan Channel to update + */ + +void +channel_timestamp_created(channel_t *chan) +{ + time_t now = time(NULL); + + tor_assert(chan); + + chan->timestamp_created = now; +} + +/** + * Update the last active timestamp. + * + * This function updates the channe's last active timestamp; it should be + * called by the lower layer whenever there is activity on the channel which + * does not lead to a cell being transmitted or received; the active timestamp + * is also updated from channel_timestamp_recv() and channel_timestamp_xmit(), + * but it should be updated for things like the v3 handshake and stuff that + * produce activity only visible to the lower layer. + * + * @param chan Channel to update + */ + +void +channel_timestamp_active(channel_t *chan) +{ + time_t now = time(NULL); + + tor_assert(chan); + + chan->timestamp_active = now; +} + +/** + * Update client timestamp + * + * This function is called by relay.c to timestamp a channel that appears to + * be used as a client. + * + * @param chan Channel to update + */ + +void +channel_timestamp_client(channel_t *chan) +{ + time_t now = time(NULL); + + tor_assert(chan); + tor_assert(!(chan->is_listener)); + + chan->u.cell_chan.timestamp_client = now; +} + +/** + * Update the last drained timestamp + * + * This is called whenever we transmit a cell which leaves the outgoing cell + * queue completely empty. It also updates the xmit time and the active time. + * + * @param chan Channel to update + */ + +void +channel_timestamp_drained(channel_t *chan) +{ + time_t now = time(NULL); + + tor_assert(chan); + tor_assert(!(chan->is_listener)); + + chan->timestamp_active = now; + chan->u.cell_chan.timestamp_drained = now; + chan->u.cell_chan.timestamp_xmit = now; +} + +/** + * Update the recv timestamp + * + * This is called whenever we get an incoming cell from the lower layer. + * This also updates the active timestamp. + * + * @param chan Channel to update + */ + +void +channel_timestamp_recv(channel_t *chan) +{ + time_t now = time(NULL); + + tor_assert(chan); + tor_assert(!(chan->is_listener)); + + chan->timestamp_active = now; + chan->u.cell_chan.timestamp_recv = now; +} + +/** + * Update the xmit timestamp + * This is called whenever we pass an outgoing cell to the lower layer. This + * also updates the active timestamp. + * + * @param chan Channel to update + */ + +void +channel_timestamp_xmit(channel_t *chan) +{ + time_t now = time(NULL); + + tor_assert(chan); + tor_assert(!(chan->is_listener)); + + chan->timestamp_active = now; + chan->u.cell_chan.timestamp_xmit = now; +} + +/*************************************************************** + * Timestamp queries - see above for definitions of timestamps * + **************************************************************/ + +/** + * Query created timestamp + * + * @param chan Channel to query + * @return Created timestamp value for chan + */ + +time_t +channel_when_created(channel_t *chan) +{ + tor_assert(chan); + + return chan->timestamp_created; +} + +/** + * Query last active timestamp + * + * @param chan Channel to query + * @return Last active timestamp value for chan + */ + +time_t +channel_when_last_active(channel_t *chan) +{ + tor_assert(chan); + + return chan->timestamp_active; +} + +/** + * Query client timestamp + * + * @param chan Channel to query + * @return Client timestamp value for chan + */ + +time_t +channel_when_last_client(channel_t *chan) +{ + tor_assert(chan); + tor_assert(!(chan->is_listener)); + + return chan->u.cell_chan.timestamp_client; +} + +/** + * Query drained timestamp + * + * @param chan Channel to query + * @return drained timestamp value for chan + */ + +time_t +channel_when_last_drained(channel_t *chan) +{ + tor_assert(chan); + tor_assert(!(chan->is_listener)); + + return chan->u.cell_chan.timestamp_drained; +} + +/** + * Query recv timestamp + * + * @param chan Channel to query + * @return Recv timestamp value for chan + */ + +time_t +channel_when_last_recv(channel_t *chan) +{ + tor_assert(chan); + tor_assert(!(chan->is_listener)); + + return chan->u.cell_chan.timestamp_recv; +} + +/** + * Query xmit timestamp + * + * @param chan Channel to query + * @return Xmit timestamp value for chan + */ + +time_t +channel_when_last_xmit(channel_t *chan) +{ + tor_assert(chan); + tor_assert(!(chan->is_listener)); + + return chan->u.cell_chan.timestamp_xmit; +} + +/** + * Check if a channel matches an extend_info_t + * + * This function calls the lower layer and asks if this channel matches a + * given extend_info_t. + * + * @param chan Channel to test + * @param extend_info Pointer to extend_info_t to match + * @return 1 if they match, 0 otherwise + */ + +int +channel_matches_extend_info(channel_t *chan, extend_info_t *extend_info) +{ + tor_assert(chan); + tor_assert(!(chan->is_listener)); + tor_assert(chan->u.cell_chan.matches_extend_info); + tor_assert(extend_info); + + return chan->u.cell_chan.matches_extend_info(chan, extend_info); +} + +/** + * Check if a channel matches a given target address + * + * This function calls into the lower layer and asks if this channel thinks + * it matches a given target address for circuit extension purposes. + * + * @param chan Channel to test + * @param target Address to match + * @return 1 if they match, 0 otherwise + */ + +int +channel_matches_target_addr_for_extend(channel_t *chan, + const tor_addr_t *target) +{ + tor_assert(chan); + tor_assert(!(chan->is_listener)); + tor_assert(chan->u.cell_chan.matches_target); + tor_assert(target); + + return chan->u.cell_chan.matches_target(chan, target); +} + +/** + * Set up circuit ID generation + * + * This is called when setting up a channel and replaces the old + * connection_or_set_circid_type() + * + * @param chan Channel to set up + * @param identity_rcvd Remote end's identity public key + */ + +void +channel_set_circid_type(channel_t *chan, crypto_pk_t *identity_rcvd) +{ + int started_here; + crypto_pk_t *our_identity; + + tor_assert(chan); + tor_assert(!(chan->is_listener)); + + started_here = channel_is_outgoing(chan); + our_identity = started_here ? + get_tlsclient_identity_key() : get_server_identity_key(); + + if (identity_rcvd) { + if (crypto_pk_cmp_keys(our_identity, identity_rcvd) < 0) { + chan->u.cell_chan.circ_id_type = CIRC_ID_TYPE_LOWER; + } else { + chan->u.cell_chan.circ_id_type = CIRC_ID_TYPE_HIGHER; + } + } else { + chan->u.cell_chan.circ_id_type = CIRC_ID_TYPE_NEITHER; + } +} + diff --git a/src/or/channel.h b/src/or/channel.h new file mode 100644 index 0000000..18d9a81 --- /dev/null +++ b/src/or/channel.h @@ -0,0 +1,399 @@ +/* * Copyright (c) 2012, The Tor Project, Inc. */ +/* See LICENSE for licensing information */ + +/** + * \file channel.h + * \brief Header file for channel.c + **/ + +#ifndef _TOR_CHANNEL_H +#define _TOR_CHANNEL_H + +#include "or.h" + +/* + * Channel struct; see thw channel_t typedef in or.h. A channel is an + * abstract interface for the OR-to-OR connection, similar to connection_or_t, + * but without the strong coupling to the underlying TLS implementation. They + * are constructed by calling a protocol-specific function to open a channel + * to a particular node, and once constructed support the abstract operations + * defined below. + */ + +struct channel_s { + /* Current channel state */ + channel_state_t state; + + /* Globally unique ID number for a channel over the lifetime of a Tor + * process. + */ + uint64_t global_identifier; + + /* Should we expect to see this channel in the channel lists? */ + unsigned char registered:1; + + /** Set this if this channel is created in CHANNEL_STATE_LISTEN, so + * lower-layer close methods that see the channel in CHANNEL_STATE_CLOSING + * know. + */ + unsigned int is_listener:1; + + /** Why did we close? + */ + enum { + CHANNEL_NOT_CLOSING = 0, + CHANNEL_CLOSE_REQUESTED, + CHANNEL_CLOSE_FROM_BELOW, + CHANNEL_CLOSE_FOR_ERROR + } reason_for_closing; + + /* Timestamps for both cell channels and listeners */ + time_t timestamp_created; /* Channel created */ + time_t timestamp_active; /* Any activity */ + + /* Methods implemented by the lower layer */ + + /* Free a channel */ + void (*free)(channel_t *); + /* Close an open channel */ + void (*close)(channel_t *); + + union { + struct { + /* Registered listen handler to call on incoming connection */ + void (*listener)(channel_t *, channel_t *); + + /* List of pending incoming connections */ + smartlist_t *incoming_list; + } listener; + struct { + /* Registered handlers for incoming cells */ + void (*cell_handler)(channel_t *, cell_t *); + void (*var_cell_handler)(channel_t *, var_cell_t *); + + /* Methods implemented by the lower layer */ + + /* + * Ask the underlying transport what the remote endpoint address is, in + * a tor_addr_t. This is optional and subclasses may leave this NULL. + * If they implement it, they should write the address out to the + * provided tor_addr_t *, and return 1 if successful or 0 if no address + * available. + */ + int (*get_remote_addr)(channel_t *, tor_addr_t *); + /* + * Get a text description of the remote endpoint; canonicalized if the + * arg is 0, or the one we originally connected to/received from if it's + * 1. + */ + const char * (*get_remote_descr)(channel_t *, int); + /* Check if the lower layer has queued writes */ + int (*has_queued_writes)(channel_t *); + /* + * If the second param is zero, ask the lower layer if this is + * 'canonical', for a transport-specific definition of canonical; if + * it is 1, ask if the answer to the preceding query is safe to rely + * on. + */ + int (*is_canonical)(channel_t *, int); + /* Check if this channel matches a specified extend_info_t */ + int (*matches_extend_info)(channel_t *, extend_info_t *); + /* Check if this channel matches a target address when extending */ + int (*matches_target)(channel_t *, const tor_addr_t *); + /* Write a cell to an open channel */ + int (*write_cell)(channel_t *, cell_t *); + /* Write a packed cell to an open channel */ + int (*write_packed_cell)(channel_t *, packed_cell_t *); + /* Write a variable-length cell to an open channel */ + int (*write_var_cell)(channel_t *, var_cell_t *); + + /* + * Hash of the public RSA key for the other side's identity key, or + * zeroes if the other side hasn't shown us a valid identity key. + */ + char identity_digest[DIGEST_LEN]; + /* Nickname of the OR on the other side, or NULL if none. */ + char *nickname; + + /* + * Linked list of channels with the same identity digest, for the + * digest->channel map + */ + channel_t *next_with_same_id, *prev_with_same_id; + + /* List of incoming cells to handle */ + smartlist_t *cell_queue; + + /* List of queued outgoing cells */ + smartlist_t *outgoing_queue; + + /* + * When we last used this conn for any client traffic. If not + * recent, we can rate limit it further. + */ + time_t client_used; + + /* Circuit stuff for use by relay.c */ + + /* + * Double-linked ring of circuits with queued cells waiting for room to + * free up on this connection's outbuf. Every time we pull cells from + * a circuit, we advance this pointer to the next circuit in the ring. + */ + struct circuit_t *active_circuits; + /* + * Priority queue of cell_ewma_t for circuits with queued cells waiting + * for room to free up on this connection's outbuf. Kept in heap order + * according to EWMA. + * + * This is redundant with active_circuits; if we ever decide only to use + * the cell_ewma algorithm for choosing circuits, we can remove + * active_circuits. + */ + smartlist_t *active_circuit_pqueue; + /* + * The tick on which the cell_ewma_ts in active_circuit_pqueue last had + * their ewma values rescaled. + */ + unsigned active_circuit_pqueue_last_recalibrated; + + /* Circuit ID generation stuff for use by circuitbuild.c */ + + /* + * When we send CREATE cells along this connection, which half of the + * space should we use? + */ + circ_id_type_t circ_id_type:2; + /* + * Which circ_id do we try to use next on this connection? This is + * always in the range 0..1<<15-1. + */ + circid_t next_circ_id; + + /* How many circuits use this connection as p_chan or n_chan? */ + int n_circuits; + + /* + * True iff this channel shouldn't get any new circs attached to it, + * because the connection is too old, or because there's a better one. + * More generally, this flag is used to note an unhealthy connection; + * for example, if a bad connection fails we shouldn't assume that the + * router itself has a problem. + */ + unsigned int is_bad_for_new_circs:1; + + /** True iff we have decided that the other end of this connection + * is a client. Channels with this flag set should never be used + * to satisfy an EXTEND request. */ + unsigned int is_client:1; + + /** Set if the channel was initiated remotely (came from a listener) */ + unsigned int is_incoming:1; + + /** Set by lower layer if this is local; i.e., everything it communicates + * with for this channel returns true for is_local_addr(). This is used + * to decide whether to declare reachability when we receive something on + * this channel in circuitbuild.c + */ + unsigned int is_local:1; + + /** Channel timestamps for cell channels */ + time_t timestamp_client; /* Client used this, according to relay.c */ + time_t timestamp_drained; /* Output queue empty */ + time_t timestamp_recv; /* Cell received from lower layer */ + time_t timestamp_xmit; /* Cell sent to lower layer */ + + /* Timestamp for relay.c */ + time_t timestamp_last_added_nonpadding; + + /** Unique ID for measuring direct network status requests;vtunneled ones + * come over a circuit_t, which has a dirreq_id field as well, but is a + * distinct namespace. */ + uint64_t dirreq_id; + } cell_chan; + } u; +}; + +/* Channel state manipulations */ + +int channel_state_is_valid(channel_state_t state); +int channel_state_can_transition(channel_state_t from, channel_state_t to); +const char * channel_state_to_string(channel_state_t state); + +/* Abstract channel operations */ + +void channel_request_close(channel_t *chan); +void channel_write_cell(channel_t *chan, cell_t *cell); +void channel_write_packed_cell(channel_t *chan, packed_cell_t *cell); +void channel_write_var_cell(channel_t *chan, var_cell_t *cell); + +/* Channel callback registrations */ + +/* Listener callback */ +void (* channel_get_listener(channel_t *chan))(channel_t *, channel_t *); +void channel_set_listener(channel_t *chan, + void (*listener)(channel_t *, channel_t *) ); + +/* Incoming cell callbacks */ +void (* channel_get_cell_handler(channel_t *chan)) + (channel_t *, cell_t *); +void (* channel_get_var_cell_handler(channel_t *chan)) + (channel_t *, var_cell_t *); +void channel_set_cell_handler(channel_t *chan, + void (*cell_handler)(channel_t *, cell_t *)); +void channel_set_cell_handlers(channel_t *chan, + void (*cell_handler)(channel_t *, cell_t *), + void (*var_cell_handler)(channel_t *, + var_cell_t *)); +void channel_set_var_cell_handler(channel_t *chan, + void (*var_cell_handler)(channel_t *, + var_cell_t *)); + +/* Clean up closed channels periodically; called from run_scheduled_events() + * in main.c + */ +void channel_run_cleanup(void); + +/* Close all channels and deallocate everything */ +void channel_free_all(void); + +#ifdef _TOR_CHANNEL_INTERNAL + +/* Channel operations for subclasses and internal use only */ + +/* Initialize a newly allocated channel - do this first in subclass + * constructors. + */ + +void channel_init_for_cells(channel_t *chan); +void channel_init_listener(channel_t *chan); + +/* Channel registration/unregistration */ +void channel_register(channel_t *chan); +void channel_unregister(channel_t *chan); + +/* Close from below */ +void channel_close_from_lower_layer(channel_t *chan); +void channel_close_for_error(channel_t *chan); +void channel_closed(channel_t *chan); + +/* Free a channel */ +void channel_free(channel_t *chan); +void channel_force_free(channel_t *chan); + +/* State/metadata setters */ + +void channel_change_state(channel_t *chan, channel_state_t to_state); +void channel_clear_identity_digest(channel_t *chan); +void channel_clear_remote_end(channel_t *chan); +void channel_mark_local(channel_t *chan); +void channel_mark_incoming(channel_t *chan); +void channel_mark_outgoing(channel_t *chan); +void channel_set_identity_digest(channel_t *chan, + const char *identity_digest); +void channel_set_remote_end(channel_t *chan, + const char *identity_digest, + const char *nickname); + +/* Timestamp updates */ +void channel_timestamp_created(channel_t *chan); +void channel_timestamp_active(channel_t *chan); +void channel_timestamp_drained(channel_t *chan); +void channel_timestamp_recv(channel_t *chan); +void channel_timestamp_xmit(channel_t *chan); + +/* Incoming channel handling */ +void channel_process_incoming(channel_t *listener); +void channel_queue_incoming(channel_t *listener, channel_t *incoming); + +/* Incoming cell handling */ +void channel_process_cells(channel_t *chan); +void channel_queue_cell(channel_t *chan, cell_t *cell); +void channel_queue_var_cell(channel_t *chan, var_cell_t *var_cell); + +/* Outgoing cell handling */ +void channel_flush_cells(channel_t *chan); + +/* Request from lower layer for more cells if available */ +ssize_t channel_flush_some_cells(channel_t *chan, ssize_t num_cells); + +/* Query if data available on this channel */ +int channel_more_to_flush(channel_t *chan); + +/* Notify flushed outgoing for dirreq handling */ +void channel_notify_flushed(channel_t *chan); + +/* Handle stuff we need to do on open like notifying circuits */ +void channel_do_open_actions(channel_t *chan); + +#endif + +/* Helper functions to perform operations on channels */ + +int channel_send_destroy(circid_t circ_id, channel_t *chan, + int reason); + +/* + * Outside abstract interfaces that should eventually get turned into + * something transport/address format independent. + */ + +channel_t * channel_connect(const tor_addr_t *addr, uint16_t port, + const char *id_digest); + +channel_t * channel_get_for_extend(const char *digest, + const tor_addr_t *target_addr, + const char **msg_out, + int *launch_out); + +/* Ask which of two channels is better for circuit-extension purposes */ +int channel_is_better(time_t now, + channel_t *a, channel_t *b, + int forgive_new_connections); + +/** Channel lookups + */ + +channel_t * channel_find_by_global_id(uint64_t global_identifier); +channel_t * channel_find_by_remote_digest(const char *identity_digest); +channel_t * channel_find_by_remote_nickname(const char *nickname); + +/** For things returned by channel_find_by_remote_digest(), walk the list. + */ + +channel_t * channel_next_with_digest(channel_t *chan); +channel_t * channel_prev_with_digest(channel_t *chan); + +/* + * Metadata queries/updates + */ + +const char * channel_get_actual_remote_descr(channel_t *chan); +int channel_get_addr_if_possible(channel_t *chan, tor_addr_t *addr_out); +const char * channel_get_canonical_remote_descr(channel_t *chan); +int channel_has_queued_writes(channel_t *chan); +int channel_is_bad_for_new_circs(channel_t *chan); +void channel_mark_bad_for_new_circs(channel_t *chan); +int channel_is_canonical(channel_t *chan); +int channel_is_canonical_is_reliable(channel_t *chan); +int channel_is_client(channel_t *chan); +int channel_is_local(channel_t *chan); +int channel_is_incoming(channel_t *chan); +int channel_is_outgoing(channel_t *chan); +void channel_mark_client(channel_t *chan); +int channel_matches_extend_info(channel_t *chan, extend_info_t *extend_info); +int channel_matches_target_addr_for_extend(channel_t *chan, + const tor_addr_t *target); +void channel_set_circid_type(channel_t *chan, crypto_pk_t *identity_rcvd); +void channel_timestamp_client(channel_t *chan); + +/* Timestamp queries */ +time_t channel_when_created(channel_t *chan); +time_t channel_when_last_active(channel_t *chan); +time_t channel_when_last_client(channel_t *chan); +time_t channel_when_last_drained(channel_t *chan); +time_t channel_when_last_recv(channel_t *chan); +time_t channel_when_last_xmit(channel_t *chan); + +#endif + diff --git a/src/or/include.am b/src/or/include.am index e9811ec..b9032d9 100644 --- a/src/or/include.am +++ b/src/or/include.am @@ -17,6 +17,7 @@ endif src_or_libtor_a_SOURCES = \ src/or/buffers.c \ + src/or/channel.c \ src/or/circuitbuild.c \ src/or/circuitlist.c \ src/or/circuituse.c \ @@ -86,6 +87,7 @@ src_or_tor_LDADD = src/or/libtor.a src/common/libor.a src/common/libor-crypto.a ORHEADERS = \ src/or/buffers.h \ + src/or/channel.h \ src/or/circuitbuild.h \ src/or/circuitlist.h \ src/or/circuituse.h \ diff --git a/src/or/or.h b/src/or/or.h index f4e1c5e..a916ac8 100644 --- a/src/or/or.h +++ b/src/or/or.h @@ -1202,29 +1202,19 @@ typedef struct or_connection_t { int tls_error; /**< Last tor_tls error code. */ /** When we last used this conn for any client traffic. If not * recent, we can rate limit it further. */ - time_t client_used; tor_addr_t real_addr; /**< The actual address that this connection came from * or went to. The addr field is prone to * getting overridden by the address from the router * descriptor matching identity_digest. */ - circ_id_type_t circ_id_type:2; /**< When we send CREATE cells along this - * connection, which half of the space should - * we use? */ /** Should this connection be used for extending circuits to the server * matching the identity_digest field? Set to true if we're pretty * sure we aren't getting MITMed, either because we're connected to an * address listed in a server descriptor, or because an authenticated * NETINFO cell listed the address we're connected to as recognized. */ unsigned int is_canonical:1; - /** True iff this connection shouldn't get any new circs attached to it, - * because the connection is too old, or because there's a better one. - * More generally, this flag is used to note an unhealthy connection; - * for example, if a bad connection fails we shouldn't assume that the - * router itself has a problem. - */ - unsigned int is_bad_for_new_circs:1; + /** True iff we have decided that the other end of this connection * is a client. Connections with this flag set should never be used * to satisfy an EXTEND request. */ @@ -1234,9 +1224,6 @@ typedef struct or_connection_t { unsigned int proxy_type:2; /**< One of PROXY_NONE...PROXY_SOCKS5 */ uint8_t link_proto; /**< What protocol version are we using? 0 for * "none negotiated yet." */ - circid_t next_circ_id; /**< Which circ_id do we try to use next on - * this connection? This is always in the - * range 0..1<<15-1. */ or_handshake_state_t *handshake_state; /**< If we are setting this connection * up, state information to do so. */ @@ -1261,21 +1248,6 @@ typedef struct or_connection_t { int n_circuits; /**< How many circuits use this connection as p_conn or * n_conn ? */ - /** Double-linked ring of circuits with queued cells waiting for room to - * free up on this connection's outbuf. Every time we pull cells from a - * circuit, we advance this pointer to the next circuit in the ring. */ - struct circuit_t *active_circuits; - /** Priority queue of cell_ewma_t for circuits with queued cells waiting for - * room to free up on this connection's outbuf. Kept in heap order - * according to EWMA. - * - * This is redundant with active_circuits; if we ever decide only to use the - * cell_ewma algorithm for choosing circuits, we can remove active_circuits. - */ - smartlist_t *active_circuit_pqueue; - /** The tick on which the cell_ewma_ts in active_circuit_pqueue last had - * their ewma values rescaled. */ - unsigned active_circuit_pqueue_last_recalibrated; struct or_connection_t *next_with_same_id; /**< Next connection with same * identity digest as this one. */ } or_connection_t; @@ -1548,6 +1520,98 @@ static INLINE listener_connection_t *TO_LISTENER_CONN(connection_t *c) return DOWNCAST(listener_connection_t, c); } +/* channel_t typedef; struct channel_s is in channel.h */ + +typedef struct channel_s channel_t; + +/* channel states for channel_t */ + +typedef enum { + /* + * Closed state - channel is inactive + * + * Permitted transitions from: + * - CHANNEL_STATE_CLOSING + * Permitted transitions to: + * - CHANNEL_STATE_LISTENING + * - CHANNEL_STATE_OPENING + */ + CHANNEL_STATE_CLOSED = 0, + /* + * Listening state - channel is listening for incoming connections + * + * Permitted transitions from: + * - CHANNEL_STATE_CLOSED + * Permitted transitions to: + * - CHANNEL_STATE_CLOSING + * - CHANNEL_STATE_ERROR + */ + CHANNEL_STATE_LISTENING, + /* + * Opening state - channel is trying to connect + * + * Permitted transitions from: + * - CHANNEL_STATE_CLOSED + * Permitted transitions to: + * - CHANNEL_STATE_CLOSING + * - CHANNEL_STATE_ERROR + * - CHANNEL_STATE_OPEN + */ + CHANNEL_STATE_OPENING, + /* + * Open state - channel is active and ready for use + * + * Permitted transitions from: + * - CHANNEL_STATE_MAINT + * - CHANNEL_STATE_OPENING + * Permitted transitions to: + * - CHANNEL_STATE_CLOSING + * - CHANNEL_STATE_ERROR + * - CHANNEL_STATE_MAINT + */ + CHANNEL_STATE_OPEN, + /* + * Maintenance state - channel is temporarily offline for subclass specific + * maintenance activities such as TLS renegotiation. + * + * Permitted transitions from: + * - CHANNEL_STATE_OPEN + * Permitted transitions to: + * - CHANNEL_STATE_CLOSING + * - CHANNEL_STATE_ERROR + * - CHANNEL_STATE_OPEN + */ + CHANNEL_STATE_MAINT, + /* + * Closing state - channel is shutting down + * + * Permitted transitions from: + * - CHANNEL_STATE_MAINT + * - CHANNEL_STATE_OPEN + * Permitted transitions to: + * - CHANNEL_STATE_CLOSED, + * - CHANNEL_STATE_ERROR + */ + CHANNEL_STATE_CLOSING, + /* + * Error state - channel has experienced a permanent error + * + * Permitted transitions from: + * - CHANNEL_STATE_CLOSING + * - CHANNEL_STATE_LISTENING + * - CHANNEL_STATE_MAINT + * - CHANNEL_STATE_OPENING + * - CHANNEL_STATE_OPEN + * Permitted transitions to: + * - None + */ + CHANNEL_STATE_ERROR, + /* + * Placeholder for maximum state value + */ + CHANNEL_STATE_LAST +} channel_state_t; + /* Conditional macros to help write code that works whether bufferevents are disabled or not. @@ -2478,8 +2542,8 @@ typedef struct { /** The EWMA of the cell count. */ double cell_count; /** True iff this is the cell count for a circuit's previous - * connection. */ - unsigned int is_for_p_conn : 1; + * channel. */ + unsigned int is_for_p_chan : 1; /** The position of the circuit within the OR connection's priority * queue. */ int heap_index; @@ -2589,7 +2653,7 @@ typedef struct circuit_t { uint64_t dirreq_id; /** The EWMA count for the number of cells flushed from the - * n_conn_cells queue. Used to determine which circuit to flush from next. + * n_chan_cells queue. Used to determine which circuit to flush from next. */ cell_ewma_t n_cell_ewma; } circuit_t;

1 0

[tor/master] Initial channeltls.c/channeltls.h for bug 6465
by andrea＠torproject.org 11 Oct '12

11 Oct '12

commit 15303c32ec9d84aff8de5ed9df28e779c36c6e5c Author: Andrea Shepard <andrea(a)persephoneslair.org> Date: Wed Aug 1 04:18:42 2012 -0700 Initial channeltls.c/channeltls.h for bug 6465 --- src/or/Makefile.nmake | 2 +- src/or/channel.h | 5 + src/or/channeltls.c | 1894 ++++++++++++++++++++++++++++++++++++++++++++++++ src/or/channeltls.h | 50 ++ src/or/connection.c | 80 ++- src/or/connection_or.c | 568 ++++++++------- src/or/connection_or.h | 14 +- src/or/include.am | 2 + src/or/or.h | 208 +++--- 9 files changed, 2431 insertions(+), 392 deletions(-) diff --git a/src/or/Makefile.nmake b/src/or/Makefile.nmake index 5915364..b145fdc 100644 --- a/src/or/Makefile.nmake +++ b/src/or/Makefile.nmake @@ -8,7 +8,7 @@ LIBS = ..\..\..\build-alpha\lib\libevent.a \ ..\..\..\build-alpha\lib\libz.a \ ws2_32.lib advapi32.lib shell32.lib -LIBTOR_OBJECTS = buffers.obj channel.obj circuitbuild.obj \ +LIBTOR_OBJECTS = buffers.obj channel.obj channeltls.obj circuitbuild.obj \ circuitlist.obj circuituse.obj command.obj config.obj connection.obj connection_edge.obj connection_or.obj control.obj cpuworker.obj \ directory.obj dirserv.obj dirvote.obj dns.obj dnsserv.obj geoip.obj \ diff --git a/src/or/channel.h b/src/or/channel.h index 18d9a81..242a078 100644 --- a/src/or/channel.h +++ b/src/or/channel.h @@ -38,6 +38,11 @@ struct channel_s { */ unsigned int is_listener:1; + /** Unique ID for measuring direct network status requests;vtunneled ones + * come over a circuit_t, which has a dirreq_id field as well, but is a + * distinct namespace. */ + uint64_t dirreq_id; + /** Why did we close? */ enum { diff --git a/src/or/channeltls.c b/src/or/channeltls.c new file mode 100644 index 0000000..352037c --- /dev/null +++ b/src/or/channeltls.c @@ -0,0 +1,1894 @@ +/* * Copyright (c) 2012, The Tor Project, Inc. */ +/* See LICENSE for licensing information */ + +/** + * \file channeltls.c + * \brief channel_t concrete subclass using or_connection_t + **/ + +/* + * Define this so channel.h gives us things only channel_t subclasses + * should touch. + */ + +#define _TOR_CHANNEL_INTERNAL + +#include "or.h" +#include "channel.h" +#include "channeltls.h" +#include "config.h" +#include "connection.h" +#include "connection_or.h" +#include "control.h" +#include "relay.h" +#include "router.h" +#include "routerlist.h" + +/** How many CELL_PADDING cells have we received, ever? */ +uint64_t stats_n_padding_cells_processed = 0; +/** How many CELL_VERSIONS cells have we received, ever? */ +uint64_t stats_n_versions_cells_processed = 0; +/** How many CELL_NETINFO cells have we received, ever? */ +uint64_t stats_n_netinfo_cells_processed = 0; +/** How many CELL_VPADDING cells have we received, ever? */ +uint64_t stats_n_vpadding_cells_processed = 0; +/** How many CELL_CERTS cells have we received, ever? */ +uint64_t stats_n_certs_cells_processed = 0; +/** How many CELL_AUTH_CHALLENGE cells have we received, ever? */ +uint64_t stats_n_auth_challenge_cells_processed = 0; +/** How many CELL_AUTHENTICATE cells have we received, ever? */ +uint64_t stats_n_authenticate_cells_processed = 0; +/** How many CELL_AUTHORIZE cells have we received, ever? */ +uint64_t stats_n_authorize_cells_processed = 0; + +/** Active listener, if any */ +channel_tls_t *channel_tls_listener = NULL; + +/* channel_tls_t method declarations */ + +static void channel_tls_close_method(channel_t *chan); +static int +channel_tls_get_remote_addr_method(channel_t *chan, tor_addr_t *addr_out); +static const char * +channel_tls_get_remote_descr_method(channel_t *chan, int req); +static int channel_tls_has_queued_writes_method(channel_t *chan); +static int channel_tls_is_canonical_method(channel_t *chan, int req); +static int +channel_tls_matches_extend_info_method(channel_t *chan, + extend_info_t *extend_info); +static int channel_tls_matches_target_method(channel_t *chan, + const tor_addr_t *target); +static int channel_tls_write_cell_method(channel_t *chan, + cell_t *cell); +static int channel_tls_write_packed_cell_method(channel_t *chan, + packed_cell_t *packed_cell); +static int channel_tls_write_var_cell_method(channel_t *chan, + var_cell_t *var_cell); + +/** Handle incoming cells for the handshake stuff here rather than + * passing them on up. */ + +static void channel_tls_process_versions_cell(var_cell_t *cell, + channel_tls_t *tlschan); +static void channel_tls_process_netinfo_cell(cell_t *cell, + channel_tls_t *tlschan); +static void channel_tls_process_certs_cell(var_cell_t *cell, + channel_tls_t *tlschan); +static void channel_tls_process_auth_challenge_cell(var_cell_t *cell, + channel_tls_t *tlschan); +static void channel_tls_process_authenticate_cell(var_cell_t *cell, + channel_tls_t *tlschan); +static int command_allowed_before_handshake(uint8_t command); +static int enter_v3_handshake_with_cell(var_cell_t *cell, + channel_tls_t *tlschan); + +/** + * Start a new TLS channel + * + * Launch a new OR connection to addr:port and expect to + * handshake with an OR with identity digest id_digest, and wrap + * it in a channel_tls_t. + * + * @param addr Address to connect on + * @param port Port to connect on + * @param id_digest Identity digest we want + * @return The launched channel, or NULL if it failed. + */ + +channel_t * +channel_tls_connect(const tor_addr_t *addr, uint16_t port, + const char *id_digest) +{ + channel_tls_t *tlschan = tor_malloc_zero(sizeof(*tlschan)); + channel_t *chan = TLS_CHAN_TO_BASE(tlschan); + channel_init_for_cells(chan); + chan->state = CHANNEL_STATE_OPENING; + chan->close = channel_tls_close_method; + chan->u.cell_chan.get_remote_addr = channel_tls_get_remote_addr_method; + chan->u.cell_chan.get_remote_descr = channel_tls_get_remote_descr_method; + chan->u.cell_chan.has_queued_writes = channel_tls_has_queued_writes_method; + chan->u.cell_chan.is_canonical = channel_tls_is_canonical_method; + chan->u.cell_chan.matches_extend_info = + channel_tls_matches_extend_info_method; + chan->u.cell_chan.matches_target = channel_tls_matches_target_method; + chan->u.cell_chan.write_cell = channel_tls_write_cell_method; + chan->u.cell_chan.write_packed_cell = channel_tls_write_packed_cell_method; + chan->u.cell_chan.write_var_cell = channel_tls_write_var_cell_method; + + log_debug(LD_CHANNEL, + "In channel_tls_connect() for channel %p (global id %lu)", + tlschan, chan->global_identifier); + + if (is_local_addr(addr)) channel_mark_local(chan); + channel_mark_outgoing(chan); + + chan->u.cell_chan.active_circuit_pqueue = smartlist_new(); + chan->u.cell_chan.active_circuit_pqueue_last_recalibrated = + cell_ewma_get_tick(); + + /* Set up or_connection stuff */ + connection_or_connect(addr, port, id_digest, tlschan); + /* connection_or_connect() will fill in tlschan->conn */ + if (!(tlschan->conn)) { + channel_change_state(chan, CHANNEL_STATE_ERROR); + goto err; + } + + log_debug(LD_CHANNEL, + "Got orconn %p for channel with global id %lu", + tlschan->conn, chan->global_identifier); + + goto done; + + err: + smartlist_free(chan->u.cell_chan.active_circuit_pqueue); + tor_free(tlschan); + chan = NULL; + + done: + /* If we got one, we should register it */ + if (chan) channel_register(chan); + + return chan; +} + +/** + * Return the current channel_tls_t listener + * + * Returns the current listening channel for incoming TLS connections, or + * NULL if none has been established + * + * @return TLS listener + */ + +channel_t * +channel_tls_get_listener(void) +{ + return TLS_CHAN_TO_BASE(channel_tls_listener); +} + +/** + * Start a channel_tls_t listener if necessary + * + * Return the current channel_tls_t listener, or start one if we haven't yet, + * and return that. + * + * @return TLS listener + */ + +channel_t * +channel_tls_start_listener(void) +{ + channel_tls_t *listener; + channel_t *lchan; + + if (!channel_tls_listener) { + listener = tor_malloc_zero(sizeof(*listener)); + lchan = TLS_CHAN_TO_BASE(listener); + channel_init_listener(lchan); + lchan->state = CHANNEL_STATE_LISTENING; + lchan->close = channel_tls_close_method; + + channel_tls_listener = listener; + + log_debug(LD_CHANNEL, + "Starting TLS listener channel %p with global id %lu", + lchan, lchan->global_identifier); + } else lchan = TLS_CHAN_TO_BASE(channel_tls_listener); + + return lchan; +} + +/** + * Free everything on shutdown + * + * Not much to do here, since channel_free_all() takes care of a lot, but let's + * get rid of the listener. + */ + +void +channel_tls_free_all(void) +{ + channel_t *base = NULL; + + log_debug(LD_CHANNEL, + "Shutting down TLS channels..."); + + if (channel_tls_listener) { + base = TLS_CHAN_TO_BASE(channel_tls_listener); + channel_unregister(base); + channel_request_close(base); + channel_free(base); + channel_tls_listener = NULL; + } + + log_debug(LD_CHANNEL, + "Done shutting down TLS channels"); +} + +/** + * Create a new channel around an incoming or_connection_t + * + * @param orconn New or_connection_t + * @return A channel to queue on the TLS listener + */ + +channel_t * +channel_tls_handle_incoming(or_connection_t *orconn) +{ + channel_tls_t *tlschan = tor_malloc_zero(sizeof(*tlschan)); + channel_t *chan = TLS_CHAN_TO_BASE(tlschan); + + tor_assert(orconn); + tor_assert(!(orconn->chan)); + + channel_init_for_cells(chan); + chan->state = CHANNEL_STATE_OPENING; + chan->close = channel_tls_close_method; + chan->u.cell_chan.get_remote_descr = channel_tls_get_remote_descr_method; + chan->u.cell_chan.has_queued_writes = channel_tls_has_queued_writes_method; + chan->u.cell_chan.is_canonical = channel_tls_is_canonical_method; + chan->u.cell_chan.matches_extend_info = + channel_tls_matches_extend_info_method; + chan->u.cell_chan.matches_target = channel_tls_matches_target_method; + chan->u.cell_chan.write_cell = channel_tls_write_cell_method; + chan->u.cell_chan.write_packed_cell = channel_tls_write_packed_cell_method; + chan->u.cell_chan.write_var_cell = channel_tls_write_var_cell_method; + + /* Link the channel and orconn to each other */ + tlschan->conn = orconn; + orconn->chan = tlschan; + + if (is_local_addr(&(TO_CONN(orconn)->addr))) channel_mark_local(chan); + channel_mark_incoming(chan); + + chan->u.cell_chan.active_circuit_pqueue = smartlist_new(); + chan->u.cell_chan.active_circuit_pqueue_last_recalibrated = + cell_ewma_get_tick(); + + /* If we got one, we should register it */ + if (chan) channel_register(chan); + + return chan; +} + +/******************************************** + * Method implementations for channel_tls_t * + *******************************************/ + +/** + * Close a channel_tls_t + * + * This implements the close method for channel_tls_t + * + * @param chan Channel to close + */ + +static void +channel_tls_close_method(channel_t *chan) +{ + channel_tls_t *tlschan = BASE_CHAN_TO_TLS(chan); + channel_t *tmp = NULL; + + tor_assert(tlschan); + + if (chan->is_listener) { + /* + * Listeners we just go ahead and change state through to CLOSED, but + * make sure to check if they're channel_tls_listener to NULL it out. + */ + if (chan == TLS_CHAN_TO_BASE(channel_tls_listener)) + channel_tls_listener = NULL; + + if (!(chan->state == CHANNEL_STATE_CLOSING || + chan->state == CHANNEL_STATE_CLOSED || + chan->state == CHANNEL_STATE_ERROR)) { + channel_change_state(chan, CHANNEL_STATE_CLOSING); + } + + if (chan->u.listener.incoming_list) { + SMARTLIST_FOREACH_BEGIN(chan->u.listener.incoming_list, + channel_t *, ichan) { + tmp = ichan; + SMARTLIST_DEL_CURRENT(chan->u.listener.incoming_list, ichan); + channel_request_close(tmp); + } SMARTLIST_FOREACH_END(ichan); + + smartlist_free(chan->u.listener.incoming_list); + chan->u.listener.incoming_list = NULL; + } + + if (!(chan->state == CHANNEL_STATE_CLOSED || + chan->state == CHANNEL_STATE_ERROR)) { + channel_change_state(chan, CHANNEL_STATE_CLOSED); + } + } else { + if (tlschan->conn) connection_or_close_normally(tlschan->conn, 1); + else { + /* Weird - we'll have to change the state ourselves, I guess */ + log_info(LD_CHANNEL, + "Tried to close channel_tls_t %p with NULL conn", + tlschan); + channel_change_state(chan, CHANNEL_STATE_ERROR); + } + } +} + +/** + * Get the remote address of a channel_tls_t + * + * This implements the get_remote_addr method for channel_tls_t; copy the + * remote endpoint of the channel to addr_out and return 1 (always + * succeeds for this transport). + * + * @param chan Channel to query + * @param addr_out Write the address out here + * @return Always succeeds and returns 1 + */ + +static int +channel_tls_get_remote_addr_method(channel_t *chan, tor_addr_t *addr_out) +{ + channel_tls_t *tlschan = BASE_CHAN_TO_TLS(chan); + + tor_assert(tlschan); + tor_assert(addr_out); + tor_assert(tlschan->conn); + + tor_addr_copy(addr_out, &(TO_CONN(tlschan->conn)->addr)); + + return 1; +} + +/** + * Get endpoint description of a channel_tls_t + * + * This implements the get_remote_descr method for channel_tls_t; it returns + * a text description of the remote endpoint of the channel suitable for use + * in log messages. The req parameter is 0 for the canonical address or 1 for + * the actual address seen. + * + * @param chan Channel to query + * @param req Request type (0 for canonical, 1 for actual) + * @return Pointer to string containing description + */ + +static const char * +channel_tls_get_remote_descr_method(channel_t *chan, int req) +{ +#define MAX_DESCR_LEN 32 + + static char buf[MAX_DESCR_LEN + 1]; + channel_tls_t *tlschan = BASE_CHAN_TO_TLS(chan); + connection_t *conn; + const char *answer = NULL; + char *addr_str; + + tor_assert(tlschan); + tor_assert(tlschan->conn); + + conn = TO_CONN(tlschan->conn); + + switch (req) { + case 0: + /* Canonical address */ + tor_snprintf(buf, MAX_DESCR_LEN + 1, + "%s:%u", conn->address, conn->port); + answer = buf; + break; + case 1: + /* Actual address */ + addr_str = tor_dup_addr(&(tlschan->conn->real_addr)); + tor_snprintf(buf, MAX_DESCR_LEN + 1, + "%s:%u", addr_str, conn->port); + tor_free(addr_str); + answer = buf; + break; + default: + /* Something's broken in channel.c */ + tor_assert(1); + } + + return answer; +} + +/** + * Tell the upper layer if we have queued writes + * + * This implements the has_queued_writes method for channel_tls _t; it returns + * 1 iff we have queued writes on the outbuf of the underlying or_connection_t. + * + * @param chan Channel to query + * @return Whether we have queued writes on the outbuf + */ + +static int +channel_tls_has_queued_writes_method(channel_t *chan) +{ + size_t outbuf_len; + channel_tls_t *tlschan = BASE_CHAN_TO_TLS(chan); + + tor_assert(tlschan); + tor_assert(tlschan->conn); + + outbuf_len = connection_get_outbuf_len(TO_CONN(tlschan->conn)); + + return (outbuf_len > 0); +} + +/** + * Tell the upper layer if we're canonical + * + * This implements the is_canonical method for channel_tls_t; if req is zero, + * it returns whether this is a canonical channel, and if it is one it returns + * whether that can be relied upon. + * + * @param chan Channel to query + * @param req Request type (0 for is_canonical, 1 for is_canonical_reliable) + * @return Query response + */ + +static int +channel_tls_is_canonical_method(channel_t *chan, int req) +{ + int answer = 0; + channel_tls_t *tlschan = BASE_CHAN_TO_TLS(chan); + + tor_assert(tlschan); + tor_assert(tlschan->conn); + + switch (req) { + case 0: + answer = tlschan->conn->is_canonical; + break; + case 1: + /* + * Is the is_canonical bit reliable? In protocols version 2 and up + * we get the canonical address from a NETINFO cell, but in older + * versions it might be based on an obsolete descriptor. + */ + answer = (tlschan->conn->link_proto >= 2); + break; + default: + /* This shouldn't happen; channel.c is broken if it does */ + tor_assert(1); + } + + return answer; +} + +/** + * Check if we match an extend_info_t + * + * This implements the matches_extend_info method for channel_tls_t; the upper + * layer wants to know if this channel matches an extend_info_t. + * + * @param chan Channel to test + * @param extend_info The extend_info_t to match + * @return 1 if this channel matches, 0 otherwise + */ + +static int +channel_tls_matches_extend_info_method(channel_t *chan, + extend_info_t *extend_info) +{ + channel_tls_t *tlschan = BASE_CHAN_TO_TLS(chan); + + tor_assert(tlschan); + tor_assert(extend_info); + + return (tor_addr_eq(&(extend_info->addr), + &(TO_CONN(tlschan->conn)->addr)) && + (extend_info->port == TO_CONN(tlschan->conn)->port)); +} + +/** + * Check if we match a target address + * + * This implements the matches_target method for channel_tls _t; the upper + * layer wants to know if this channel matches a target address when extending + * a circuit. + * + * @param chan Channel to test + * @param target Address to match + * @return 1 if this channel matches, 0 otherwise + */ + +static int +channel_tls_matches_target_method(channel_t *chan, + const tor_addr_t *target) +{ + channel_tls_t *tlschan = BASE_CHAN_TO_TLS(chan); + + tor_assert(tlschan); + tor_assert(target); + tor_assert(tlschan->conn); + + return tor_addr_compare(&(tlschan->conn->real_addr), + target, CMP_EXACT); +} + +/** + * Write a cell to a channel_tls_t + * + * This implements the write_cell method for channel_tls_t; given a + * channel_tls_t and a cell_t, transmit the cell_t. + * + * @param chan Channel to transmit on + * @param cell Cell to transmit + * @return Always succeeds and returns 1 + */ + +static int +channel_tls_write_cell_method(channel_t *chan, cell_t *cell) +{ + channel_tls_t *tlschan = BASE_CHAN_TO_TLS(chan); + + tor_assert(tlschan); + tor_assert(cell); + tor_assert(tlschan->conn); + + connection_or_write_cell_to_buf(cell, tlschan->conn); + + return 1; +} + +/** + * Write a packed cell to a channel_tls_t + * + * This implements the write_packed_cell method for channel_tls_t; given a + * channel_tls_t and a packed_cell_t, transmit the packed_cell_t. + * + * @param chan Channel to transmit on + * @param packed_cell Cell to transmit + * @return Always succeeds and returns 1 + */ + +static int +channel_tls_write_packed_cell_method(channel_t *chan, + packed_cell_t *packed_cell) +{ + channel_tls_t *tlschan = BASE_CHAN_TO_TLS(chan); + + tor_assert(tlschan); + tor_assert(packed_cell); + tor_assert(tlschan->conn); + + connection_write_to_buf(packed_cell->body, CELL_NETWORK_SIZE, + TO_CONN(tlschan->conn)); + + /* This is where the cell is finished; used to be done from relay.c */ + packed_cell_free(packed_cell); + + return 1; +} + +/** + * Write a variable-length cell to a channel_tls_t + * + * This implements the write_var_cell method for channel_tls_t; given a + * channel_tls_t and a var_cell_t, transmit the var_cell_t. + * + * @param chan Channel to transmit on + * @param var_cell Cell to transmit + * @return Always succeeds and returns 1 + */ + +static int +channel_tls_write_var_cell_method(channel_t *chan, var_cell_t *var_cell) +{ + channel_tls_t *tlschan = BASE_CHAN_TO_TLS(chan); + + tor_assert(tlschan); + tor_assert(var_cell); + tor_assert(tlschan->conn); + + connection_or_write_var_cell_to_buf(var_cell, tlschan->conn); + + return 1; +} + +/******************************************************* + * Functions for handling events on an or_connection_t * + ******************************************************/ + +/** + * Handle orconn state changes + * + * This function will be called by connection_or.c when the or_connection_t + * associated with this channel_tls_t changes state. + * + * @param chan Channel controlling the or_connection_t + * @param conn The or_connection_t changing state + * @param old_state The old state of conn + * @param state The new state of conn + */ + +void +channel_tls_handle_state_change_on_orconn(channel_tls_t *chan, + or_connection_t *conn, + uint8_t old_state, + uint8_t state) +{ + channel_t *base_chan; + + tor_assert(chan); + tor_assert(conn); + tor_assert(conn->chan == chan); + tor_assert(chan->conn == conn); + /* -Werror appeasement */ + tor_assert(old_state == old_state); + + base_chan = TLS_CHAN_TO_BASE(chan); + + /* Make sure the base connection state makes sense - shouldn't be error, + * closed or listening. */ + + tor_assert(base_chan->state == CHANNEL_STATE_OPENING || + base_chan->state == CHANNEL_STATE_OPEN || + base_chan->state == CHANNEL_STATE_MAINT || + base_chan->state == CHANNEL_STATE_CLOSING); + + /* Did we just go to state open? */ + if (state == OR_CONN_STATE_OPEN) { + /* + * We can go to CHANNEL_STATE_OPEN from CHANNEL_STATE_OPENING or + * CHANNEL_STATE_MAINT on this. + */ + channel_change_state(base_chan, CHANNEL_STATE_OPEN); + } else { + /* + * Not open, so from CHANNEL_STATE_OPEN we go to CHANNEL_STATE_MAINT, + * otherwise no change. + */ + if (base_chan->state == CHANNEL_STATE_OPEN) { + channel_change_state(base_chan, CHANNEL_STATE_MAINT); + } + } +} + +/** + * Try to flush cells from a channel_tls_t + * + * Try to flush up to about num_cells cells, and return how many we flushed. + * + * @param chan Channel to flush + * @param num_cells Maximum number of cells + * @return Number of cells actually flushed + */ + +ssize_t +channel_tls_flush_some_cells(channel_tls_t *chan, ssize_t num_cells) +{ + ssize_t flushed = 0; + + tor_assert(chan); + + if (flushed >= num_cells) goto done; + + /* + * If channel_tls_t ever buffers anything below the channel_t layer, flush + * that first here. + */ + + flushed += channel_flush_some_cells(TLS_CHAN_TO_BASE(chan), + num_cells - flushed); + + /* + * If channel_tls_t ever buffers anything below the channel_t layer, check + * how much we actually got and push it on down here. + */ + + done: + return flushed; +} + +/** + * Check if a channel_tls_t has anything to flush + * + * Return true if there is any more to flush on this channel (cells in queue + * or active circuits). + * + * @param chan Channel to test + * @return 1 if chan has anything to flush, 0 otherwise + */ + +int +channel_tls_more_to_flush(channel_tls_t *chan) +{ + tor_assert(chan); + + /* + * If channel_tls_t ever buffers anything below channel_t, the + * check for that should go here first. + */ + + return channel_more_to_flush(TLS_CHAN_TO_BASE(chan)); +} + +#ifdef KEEP_TIMING_STATS + +/** + * Timing states wrapper + * + * This is a wrapper function around the actual function that processes the + * cell that just arrived on chan. Increment *time + * by the number of microseconds used by the call to *func(cell, chan). + * + * @param cell Incoming cell to process + * @param chan Channel it arrived on + * @param time Increment this by the number of microseconds it took to handle + * this cell + * @param func Function pointer to cell handling function + */ + +static void +channel_tls_time_process_cell(cell_t *cell, channel_tls_t *chan, int *time, + void (*func)(cell_t *, channel_tls_t *)) +{ + struct timeval start, end; + long time_passed; + + tor_gettimeofday(&start); + + (*func)(cell, chan); + + tor_gettimeofday(&end); + time_passed = tv_udiff(&start, &end) ; + + if (time_passed > 10000) { /* more than 10ms */ + log_debug(LD_OR,"That call just took %ld ms.",time_passed/1000); + } + + if (time_passed < 0) { + log_info(LD_GENERAL,"That call took us back in time!"); + time_passed = 0; + } + + *time += time_passed; +} +#endif + +/** + * Handle an incoming cell on a channel_tls_t + * + * This is called from connection_or.c to handle an arriving cell; it checks + * for cell types specific to the handshake for this transport protocol and + * handles them, and queues all other cells to the channel_t layer, which + * eventually will hand them off to command.c. + * + * @param cell Cell to handle + * @param conn The or_connection_t cell arrived on + */ + +void +channel_tls_handle_cell(cell_t *cell, or_connection_t *conn) +{ + channel_tls_t *chan; + int handshaking; + +#ifdef KEEP_TIMING_STATS +#define PROCESS_CELL(tp, cl, cn) STMT_BEGIN { \ + ++num ## tp; \ + channel_tls_time_process_cell(cl, cn, & tp ## time , \ + channel_tls_process_ ## tp ## _cell); \ + } STMT_END +#else +#define PROCESS_CELL(tp, cl, cn) channel_tls_process_ ## tp ## _cell(cl, cn) +#endif + + tor_assert(cell); + tor_assert(conn); + + chan = conn->chan; + + if (!chan) { + log_warn(LD_CHANNEL, + "Got a cell_t on an OR connection with no channel"); + return; + } + + tor_assert(!(TLS_CHAN_TO_BASE(chan)->is_listener)); + + handshaking = (TO_CONN(conn)->state != OR_CONN_STATE_OPEN); + + if (conn->_base.marked_for_close) + return; + + /* Reject all but VERSIONS and NETINFO when handshaking. */ + /* (VERSIONS should actually be impossible; it's variable-length.) */ + if (handshaking && cell->command != CELL_VERSIONS && + cell->command != CELL_NETINFO) { + log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL, + "Received unexpected cell command %d in chan state %s / " + "conn state %s; closing the connection.", + (int)cell->command, + channel_state_to_string(TLS_CHAN_TO_BASE(chan)->state), + conn_state_to_string(CONN_TYPE_OR, TO_CONN(conn)->state)); + connection_or_close_for_error(conn, 0); + return; + } + + if (conn->_base.state == OR_CONN_STATE_OR_HANDSHAKING_V3) + or_handshake_state_record_cell(conn->handshake_state, cell, 1); + + switch (cell->command) { + case CELL_PADDING: + ++stats_n_padding_cells_processed; + /* do nothing */ + break; + case CELL_VERSIONS: + tor_fragile_assert(); + break; + case CELL_NETINFO: + ++stats_n_netinfo_cells_processed; + PROCESS_CELL(netinfo, cell, chan); + break; + case CELL_CREATE: + case CELL_CREATE_FAST: + case CELL_CREATED: + case CELL_CREATED_FAST: + case CELL_RELAY: + case CELL_RELAY_EARLY: + case CELL_DESTROY: + /* + * These are all transport independent and we pass them up through the + * channel_t mechanism. They are ultimately handled in command.c. + */ + channel_queue_cell(TLS_CHAN_TO_BASE(chan), cell); + break; + default: + log_fn(LOG_INFO, LD_PROTOCOL, + "Cell of unknown type (%d) received in channeltls.c. " + "Dropping.", + cell->command); + break; + } +} + +/** + * Handle an incoming variable-length cell on a channel_tls_t + * + * Process a var_cell that was just received on conn. Keep + * internal statistics about how many of each cell we've processed so far + * this second, and the total number of microseconds it took to + * process each type of cell. All the var_cell commands are handshake- + * related and live below the channel_t layer, so no variable-length + * cells ever get delivered in the current implementation, but I've left + * the mechanism in place for future use. + * + * @param var_cell Incoming cell to handle + * @param conn The or_connection_t var_cell arrived on + */ + +void +channel_tls_handle_var_cell(var_cell_t *var_cell, or_connection_t *conn) +{ + channel_tls_t *chan; + int handshaking; + +#ifdef KEEP_TIMING_STATS + /* how many of each cell have we seen so far this second? needs better + * name. */ + static int num_versions = 0, num_certs = 0; + static time_t current_second = 0; /* from previous calls to time */ + time_t now = time(NULL); + + if (current_second == 0) current_second = now; + if (now > current_second) { /* the second has rolled over */ + /* print stats */ + log_info(LD_OR, + "At end of second: %d versions (%d ms), %d certs (%d ms)", + num_versions, versions_time / ((now - current_second) * 1000), + num_certs, certs_time / ((now - current_second) * 1000)); + + num_versions = num_certs = 0; + versions_time = certs_time = 0; + + /* remember which second it is, for next time */ + current_second = now; + } +#endif + + tor_assert(var_cell); + tor_assert(conn); + + chan = conn->chan; + + if (!chan) { + log_warn(LD_CHANNEL, + "Got a var_cell_t on an OR connection with no channel"); + return; + } + + tor_assert(!(TLS_CHAN_TO_BASE(chan)->is_listener)); + + handshaking = (TO_CONN(conn)->state != OR_CONN_STATE_OPEN); + + if (TO_CONN(conn)->marked_for_close) + return; + + switch (TO_CONN(conn)->state) { + case OR_CONN_STATE_OR_HANDSHAKING_V2: + if (var_cell->command != CELL_VERSIONS) { + log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL, + "Received a cell with command %d in unexpected " + "orconn state \"%s\" [%d], channel state \"%s\" [%d]; " + "closing the connection.", + (int)(var_cell->command), + conn_state_to_string(CONN_TYPE_OR, TO_CONN(conn)->state), + TO_CONN(conn)->state, + channel_state_to_string(TLS_CHAN_TO_BASE(chan)->state), + (int)(TLS_CHAN_TO_BASE(chan)->state)); + /* + * The code in connection_or.c will tell channel_t to close for + * error; it will go to CHANNEL_STATE_CLOSING, and then to + * CHANNEL_STATE_ERROR when conn is closed. + */ + connection_or_close_for_error(conn, 0); + return; + } + break; + case OR_CONN_STATE_TLS_HANDSHAKING: + /* If we're using bufferevents, it's entirely possible for us to + * notice "hey, data arrived!" before we notice "hey, the handshake + * finished!" And we need to be accepting both at once to handle both + * the v2 and v3 handshakes. */ + + /* fall through */ + case OR_CONN_STATE_TLS_SERVER_RENEGOTIATING: + if (!(command_allowed_before_handshake(var_cell->command))) { + log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL, + "Received a cell with command %d in unexpected " + "orconn state \"%s\" [%d], channel state \"%s\" [%d]; " + "closing the connection.", + (int)(var_cell->command), + conn_state_to_string(CONN_TYPE_OR, TO_CONN(conn)->state), + (int)(TO_CONN(conn)->state), + channel_state_to_string(TLS_CHAN_TO_BASE(chan)->state), + (int)(TLS_CHAN_TO_BASE(chan)->state)); + /* see above comment about CHANNEL_STATE_ERROR */ + connection_or_close_for_error(conn, 0); + return; + } else { + if (enter_v3_handshake_with_cell(var_cell, chan) < 0) + return; + } + break; + case OR_CONN_STATE_OR_HANDSHAKING_V3: + if (var_cell->command != CELL_AUTHENTICATE) + or_handshake_state_record_var_cell(conn->handshake_state, var_cell, 1); + break; /* Everything is allowed */ + case OR_CONN_STATE_OPEN: + if (conn->link_proto < 3) { + log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL, + "Received a variable-length cell with command %d in orconn " + "state %s [%d], channel state %s [%d] with link protocol %d; " + "ignoring it.", + (int)(var_cell->command), + conn_state_to_string(CONN_TYPE_OR, TO_CONN(conn)->state), + (int)(TO_CONN(conn)->state), + channel_state_to_string(TLS_CHAN_TO_BASE(chan)->state), + (int)(TLS_CHAN_TO_BASE(chan)->state), + (int)(conn->link_proto)); + return; + } + break; + default: + log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL, + "Received var-length cell with command %d in unexpected " + "orconn state \"%s\" [%d], channel state \"%s\" [%d]; " + "ignoring it.", + (int)(var_cell->command), + conn_state_to_string(CONN_TYPE_OR, TO_CONN(conn)->state), + (int)(TO_CONN(conn)->state), + channel_state_to_string(TLS_CHAN_TO_BASE(chan)->state), + (int)(TLS_CHAN_TO_BASE(chan)->state)); + return; + } + + /* Now handle the cell */ + + switch (var_cell->command) { + case CELL_VERSIONS: + ++stats_n_versions_cells_processed; + PROCESS_CELL(versions, var_cell, chan); + break; + case CELL_VPADDING: + ++stats_n_vpadding_cells_processed; + /* Do nothing */ + break; + case CELL_CERTS: + ++stats_n_certs_cells_processed; + PROCESS_CELL(certs, var_cell, chan); + break; + case CELL_AUTH_CHALLENGE: + ++stats_n_auth_challenge_cells_processed; + PROCESS_CELL(auth_challenge, var_cell, chan); + break; + case CELL_AUTHENTICATE: + ++stats_n_authenticate_cells_processed; + PROCESS_CELL(authenticate, var_cell, chan); + break; + case CELL_AUTHORIZE: + ++stats_n_authorize_cells_processed; + /* Ignored so far. */ + break; + default: + log_fn(LOG_INFO, LD_PROTOCOL, + "Variable-length cell of unknown type (%d) received.", + (int)(var_cell->command)); + break; + } +} + +/** + * Check if this cell type is allowed before the handshake is finished + * + * Return true if command is a cell command that's allowed to start a + * V3 handshake. + * + * @param command Cell type to check + */ + +static int +command_allowed_before_handshake(uint8_t command) +{ + switch (command) { + case CELL_VERSIONS: + case CELL_VPADDING: + case CELL_AUTHORIZE: + return 1; + default: + return 0; + } +} + +/** + * Start a V3 handshake on an incoming connection + * + * Called when we as a server receive an appropriate cell while waiting + * either for a cell or a TLS handshake. Set the connection's state to + * "handshaking_v3', initializes the or_handshake_state field as needed, + * and add the cell to the hash of incoming cells.) + * + * @param cell Incoming cell initiating the handshake + * @param chan Channel cell was received on + * @return 0 on success; return -1 and mark the connection on failure. + */ + +static int +enter_v3_handshake_with_cell(var_cell_t *cell, channel_tls_t *chan) +{ + int started_here = 0; + + tor_assert(cell); + tor_assert(chan); + tor_assert(!(TLS_CHAN_TO_BASE(chan)->is_listener)); + tor_assert(chan->conn); + + started_here = connection_or_nonopen_was_started_here(chan->conn); + + tor_assert(TO_CONN(chan->conn)->state == OR_CONN_STATE_TLS_HANDSHAKING || + TO_CONN(chan->conn)->state == + OR_CONN_STATE_TLS_SERVER_RENEGOTIATING); + + if (started_here) { + log_fn(LOG_PROTOCOL_WARN, LD_OR, + "Received a cell while TLS-handshaking, not in " + "OR_HANDSHAKING_V3, on a connection we originated."); + } + chan->conn->_base.state = OR_CONN_STATE_OR_HANDSHAKING_V3; + if (connection_init_or_handshake_state(chan->conn, started_here) < 0) { + connection_or_close_for_error(chan->conn, 0); + return -1; + } + or_handshake_state_record_var_cell(chan->conn->handshake_state, cell, 1); + return 0; +} + +/** + * Process a 'versions' cell. + * + * This function is called to handle an incoming VERSIONS cell; the current + * link protocol version must be 0 to indicate that no version has yet been + * negotiated. We compare the versions in the cell to the list of versions + * we support, pick the highest version we have in common, and continue the + * negotiation from there. + * + * @param cell Incoming VERSIONS cell + * @param chan Channel that cell arrived on + */ + +static void +channel_tls_process_versions_cell(var_cell_t *cell, channel_tls_t *chan) +{ + int highest_supported_version = 0; + const uint8_t *cp, *end; + int started_here = 0; + + tor_assert(cell); + tor_assert(chan); + tor_assert(!(TLS_CHAN_TO_BASE(chan)->is_listener)); + tor_assert(chan->conn); + + started_here = connection_or_nonopen_was_started_here(chan->conn); + + if (chan->conn->link_proto != 0 || + (chan->conn->handshake_state && + chan->conn->handshake_state->received_versions)) { + log_fn(LOG_PROTOCOL_WARN, LD_OR, + "Received a VERSIONS cell on a connection with its version " + "already set to %d; dropping", + (int)(chan->conn->link_proto)); + return; + } + switch (chan->conn->_base.state) + { + case OR_CONN_STATE_OR_HANDSHAKING_V2: + case OR_CONN_STATE_OR_HANDSHAKING_V3: + break; + case OR_CONN_STATE_TLS_HANDSHAKING: + case OR_CONN_STATE_TLS_SERVER_RENEGOTIATING: + default: + log_fn(LOG_PROTOCOL_WARN, LD_OR, + "VERSIONS cell while in unexpected state"); + return; + } + + tor_assert(chan->conn->handshake_state); + end = cell->payload + cell->payload_len; + for (cp = cell->payload; cp+1 < end; ++cp) { + uint16_t v = ntohs(get_uint16(cp)); + if (is_or_protocol_version_known(v) && v > highest_supported_version) + highest_supported_version = v; + } + if (!highest_supported_version) { + log_fn(LOG_PROTOCOL_WARN, LD_OR, + "Couldn't find a version in common between my version list and the " + "list in the VERSIONS cell; closing connection."); + connection_or_close_for_error(chan->conn, 0); + return; + } else if (highest_supported_version == 1) { + /* Negotiating version 1 makes no sense, since version 1 has no VERSIONS + * cells. */ + log_fn(LOG_PROTOCOL_WARN, LD_OR, + "Used version negotiation protocol to negotiate a v1 connection. " + "That's crazily non-compliant. Closing connection."); + connection_or_close_for_error(chan->conn, 0); + return; + } else if (highest_supported_version < 3 && + chan->conn->_base.state == OR_CONN_STATE_OR_HANDSHAKING_V3) { + log_fn(LOG_PROTOCOL_WARN, LD_OR, + "Negotiated link protocol 2 or lower after doing a v3 TLS " + "handshake. Closing connection."); + connection_or_close_for_error(chan->conn, 0); + return; + } + + chan->conn->link_proto = highest_supported_version; + chan->conn->handshake_state->received_versions = 1; + + if (chan->conn->link_proto == 2) { + log_info(LD_OR, + "Negotiated version %d with %s:%d; sending NETINFO.", + highest_supported_version, + safe_str_client(chan->conn->_base.address), + chan->conn->_base.port); + + if (connection_or_send_netinfo(chan->conn) < 0) { + connection_or_close_for_error(chan->conn, 0); + return; + } + } else { + const int send_versions = !started_here; + /* If we want to authenticate, send a CERTS cell */ + const int send_certs = !started_here || public_server_mode(get_options()); + /* If we're a relay that got a connection, ask for authentication. */ + const int send_chall = !started_here && public_server_mode(get_options()); + /* If our certs cell will authenticate us, we can send a netinfo cell + * right now. */ + const int send_netinfo = !started_here; + const int send_any = + send_versions || send_certs || send_chall || send_netinfo; + tor_assert(chan->conn->link_proto >= 3); + + log_info(LD_OR, + "Negotiated version %d with %s:%d; %s%s%s%s%s", + highest_supported_version, + safe_str_client(chan->conn->_base.address), + chan->conn->_base.port, + send_any ? "Sending cells:" : "Waiting for CERTS cell", + send_versions ? " VERSIONS" : "", + send_certs ? " CERTS" : "", + send_chall ? " AUTH_CHALLENGE" : "", + send_netinfo ? " NETINFO" : ""); + +#ifdef DISABLE_V3_LINKPROTO_SERVERSIDE + if (1) { + connection_or_close_normally(chan->conn, 1); + return; + } +#endif + + if (send_versions) { + if (connection_or_send_versions(chan->conn, 1) < 0) { + log_warn(LD_OR, "Couldn't send versions cell"); + connection_or_close_for_error(chan->conn, 0); + return; + } + } + if (send_certs) { + if (connection_or_send_certs_cell(chan->conn) < 0) { + log_warn(LD_OR, "Couldn't send certs cell"); + connection_or_close_for_error(chan->conn, 0); + return; + } + } + if (send_chall) { + if (connection_or_send_auth_challenge_cell(chan->conn) < 0) { + log_warn(LD_OR, "Couldn't send auth_challenge cell"); + connection_or_close_for_error(chan->conn, 0); + return; + } + } + if (send_netinfo) { + if (connection_or_send_netinfo(chan->conn) < 0) { + log_warn(LD_OR, "Couldn't send netinfo cell"); + connection_or_close_for_error(chan->conn, 0); + return; + } + } + } +} + +/** + * Process a 'netinfo' cell + * + * This function is called to handle an incoming NETINFO cell; read and act + * on its contents, and set the connection state to "open". + * + * @param cell Incoming NETINFO cell + * @param chan Channel that cell arrived on + */ + +static void +channel_tls_process_netinfo_cell(cell_t *cell, channel_tls_t *chan) +{ + time_t timestamp; + uint8_t my_addr_type; + uint8_t my_addr_len; + const uint8_t *my_addr_ptr; + const uint8_t *cp, *end; + uint8_t n_other_addrs; + time_t now = time(NULL); + + long apparent_skew = 0; + tor_addr_t my_apparent_addr = TOR_ADDR_NULL; + + tor_assert(cell); + tor_assert(chan); + tor_assert(!(TLS_CHAN_TO_BASE(chan)->is_listener)); + tor_assert(chan->conn); + + if (chan->conn->link_proto < 2) { + log_fn(LOG_PROTOCOL_WARN, LD_OR, + "Received a NETINFO cell on %s connection; dropping.", + chan->conn->link_proto == 0 ? "non-versioned" : "a v1"); + return; + } + if (chan->conn->_base.state != OR_CONN_STATE_OR_HANDSHAKING_V2 && + chan->conn->_base.state != OR_CONN_STATE_OR_HANDSHAKING_V3) { + log_fn(LOG_PROTOCOL_WARN, LD_OR, + "Received a NETINFO cell on non-handshaking connection; dropping."); + return; + } + tor_assert(chan->conn->handshake_state && + chan->conn->handshake_state->received_versions); + + if (chan->conn->_base.state == OR_CONN_STATE_OR_HANDSHAKING_V3) { + tor_assert(chan->conn->link_proto >= 3); + if (chan->conn->handshake_state->started_here) { + if (!(chan->conn->handshake_state->authenticated)) { + log_fn(LOG_PROTOCOL_WARN, LD_OR, + "Got a NETINFO cell from server, " + "but no authentication. Closing the connection."); + connection_or_close_for_error(chan->conn, 0); + return; + } + } else { + /* we're the server. If the client never authenticated, we have + some housekeeping to do.*/ + if (!(chan->conn->handshake_state->authenticated)) { + tor_assert(tor_digest_is_zero( + (const char*)(chan->conn->handshake_state-> + authenticated_peer_id))); + channel_set_circid_type(TLS_CHAN_TO_BASE(chan), NULL); + + connection_or_init_conn_from_address(chan->conn, + &(chan->conn->_base.addr), + chan->conn->_base.port, + (const char*)(chan->conn->handshake_state-> + authenticated_peer_id), + 0); + } + } + } + + /* Decode the cell. */ + timestamp = ntohl(get_uint32(cell->payload)); + if (labs(now - chan->conn->handshake_state->sent_versions_at) < 180) { + apparent_skew = now - timestamp; + } + + my_addr_type = (uint8_t) cell->payload[4]; + my_addr_len = (uint8_t) cell->payload[5]; + my_addr_ptr = (uint8_t*) cell->payload + 6; + end = cell->payload + CELL_PAYLOAD_SIZE; + cp = cell->payload + 6 + my_addr_len; + if (cp >= end) { + log_fn(LOG_PROTOCOL_WARN, LD_OR, + "Addresses too long in netinfo cell; closing connection."); + connection_or_close_for_error(chan->conn, 0); + return; + } else if (my_addr_type == RESOLVED_TYPE_IPV4 && my_addr_len == 4) { + tor_addr_from_ipv4n(&my_apparent_addr, get_uint32(my_addr_ptr)); + } else if (my_addr_type == RESOLVED_TYPE_IPV6 && my_addr_len == 16) { + tor_addr_from_ipv6_bytes(&my_apparent_addr, (const char *) my_addr_ptr); + } + + n_other_addrs = (uint8_t) *cp++; + while (n_other_addrs && cp < end-2) { + /* Consider all the other addresses; if any matches, this connection is + * "canonical." */ + tor_addr_t addr; + const uint8_t *next = + decode_address_from_payload(&addr, cp, (int)(end-cp)); + if (next == NULL) { + log_fn(LOG_PROTOCOL_WARN, LD_OR, + "Bad address in netinfo cell; closing connection."); + connection_or_close_for_error(chan->conn, 0); + return; + } + if (tor_addr_eq(&addr, &(chan->conn->real_addr))) { + chan->conn->is_canonical = 1; + break; + } + cp = next; + --n_other_addrs; + } + + /* Act on apparent skew. */ + /** Warn when we get a netinfo skew with at least this value. */ +#define NETINFO_NOTICE_SKEW 3600 + if (labs(apparent_skew) > NETINFO_NOTICE_SKEW && + router_get_by_id_digest(chan->conn->identity_digest)) { + char dbuf[64]; + int severity; + /*XXXX be smarter about when everybody says we are skewed. */ + if (router_digest_is_trusted_dir(chan->conn->identity_digest)) + severity = LOG_WARN; + else + severity = LOG_INFO; + format_time_interval(dbuf, sizeof(dbuf), apparent_skew); + log_fn(severity, LD_GENERAL, + "Received NETINFO cell with skewed time from " + "server at %s:%d. It seems that our clock is %s by %s, or " + "that theirs is %s. Tor requires an accurate clock to work: " + "please check your time and date settings.", + chan->conn->_base.address, + (int)(chan->conn->_base.port), + apparent_skew > 0 ? "ahead" : "behind", + dbuf, + apparent_skew > 0 ? "behind" : "ahead"); + if (severity == LOG_WARN) /* only tell the controller if an authority */ + control_event_general_status(LOG_WARN, + "CLOCK_SKEW SKEW=%ld SOURCE=OR:%s:%d", + apparent_skew, + chan->conn->_base.address, + chan->conn->_base.port); + } + + /* XXX maybe act on my_apparent_addr, if the source is sufficiently + * trustworthy. */ + + if (connection_or_set_state_open(chan->conn) < 0) { + log_fn(LOG_PROTOCOL_WARN, LD_OR, + "Got good NETINFO cell from %s:%d; but " + "was unable to make the OR connection become open.", + safe_str_client(chan->conn->_base.address), + chan->conn->_base.port); + connection_or_close_for_error(chan->conn, 0); + } else { + log_info(LD_OR, + "Got good NETINFO cell from %s:%d; OR connection is now " + "open, using protocol version %d. Its ID digest is %s. " + "Our address is apparently %s.", + safe_str_client(chan->conn->_base.address), + chan->conn->_base.port, + (int)(chan->conn->link_proto), + hex_str(TLS_CHAN_TO_BASE(chan)->u.cell_chan.identity_digest, + DIGEST_LEN), + tor_addr_is_null(&my_apparent_addr) ? + "<none>" : fmt_and_decorate_addr(&my_apparent_addr)); + } + assert_connection_ok(TO_CONN(chan->conn),time(NULL)); +} + +/** + * Process a CERTS cell from a channel. + * + * This function is called to process an incoming CERTS cell on a + * channel_tls_t: + * + * If the other side should not have sent us a CERTS cell, or the cell is + * malformed, or it is supposed to authenticate the TLS key but it doesn't, + * then mark the connection. + * + * If the cell has a good cert chain and we're doing a v3 handshake, then + * store the certificates in or_handshake_state. If this is the client side + * of the connection, we then authenticate the server or mark the connection. + * If it's the server side, wait for an AUTHENTICATE cell. + * + * @param cell Incoming CERTS cell + * @param chan Channel that cell arrived on + */ + +static void +channel_tls_process_certs_cell(var_cell_t *cell, channel_tls_t *chan) +{ + tor_cert_t *link_cert = NULL; + tor_cert_t *id_cert = NULL; + tor_cert_t *auth_cert = NULL; + uint8_t *ptr; + int n_certs, i; + int send_netinfo = 0; + + tor_assert(cell); + tor_assert(chan); + tor_assert(!(TLS_CHAN_TO_BASE(chan)->is_listener)); + tor_assert(chan->conn); + +#define ERR(s) \ + do { \ + log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL, \ + "Received a bad CERTS cell from %s:%d: %s", \ + safe_str(chan->conn->_base.address), \ + chan->conn->_base.port, (s)); \ + connection_or_close_for_error(chan->conn, 0); \ + return; \ + } while (0) + + if (chan->conn->_base.state != OR_CONN_STATE_OR_HANDSHAKING_V3) + ERR("We're not doing a v3 handshake!"); + if (chan->conn->link_proto < 3) + ERR("We're not using link protocol >= 3"); + if (chan->conn->handshake_state->received_certs_cell) + ERR("We already got one"); + if (chan->conn->handshake_state->authenticated) { + /* Should be unreachable, but let's make sure. */ + ERR("We're already authenticated!"); + } + if (cell->payload_len < 1) + ERR("It had no body"); + if (cell->circ_id) + ERR("It had a nonzero circuit ID"); + + n_certs = cell->payload[0]; + ptr = cell->payload + 1; + for (i = 0; i < n_certs; ++i) { + uint8_t cert_type; + uint16_t cert_len; + if (ptr + 3 > cell->payload + cell->payload_len) { + goto truncated; + } + cert_type = *ptr; + cert_len = ntohs(get_uint16(ptr+1)); + if (ptr + 3 + cert_len > cell->payload + cell->payload_len) { + goto truncated; + } + if (cert_type == OR_CERT_TYPE_TLS_LINK || + cert_type == OR_CERT_TYPE_ID_1024 || + cert_type == OR_CERT_TYPE_AUTH_1024) { + tor_cert_t *cert = tor_cert_decode(ptr + 3, cert_len); + if (!cert) { + log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL, + "Received undecodable certificate in CERTS cell from %s:%d", + safe_str(chan->conn->_base.address), + chan->conn->_base.port); + } else { + if (cert_type == OR_CERT_TYPE_TLS_LINK) { + if (link_cert) { + tor_cert_free(cert); + ERR("Too many TLS_LINK certificates"); + } + link_cert = cert; + } else if (cert_type == OR_CERT_TYPE_ID_1024) { + if (id_cert) { + tor_cert_free(cert); + ERR("Too many ID_1024 certificates"); + } + id_cert = cert; + } else if (cert_type == OR_CERT_TYPE_AUTH_1024) { + if (auth_cert) { + tor_cert_free(cert); + ERR("Too many AUTH_1024 certificates"); + } + auth_cert = cert; + } else { + tor_cert_free(cert); + } + } + } + ptr += 3 + cert_len; + continue; + + truncated: + ERR("It ends in the middle of a certificate"); + } + + if (chan->conn->handshake_state->started_here) { + int severity; + if (! (id_cert && link_cert)) + ERR("The certs we wanted were missing"); + /* Okay. We should be able to check the certificates now. */ + if (! tor_tls_cert_matches_key(chan->conn->tls, link_cert)) { + ERR("The link certificate didn't match the TLS public key"); + } + /* Note that this warns more loudly about time and validity if we were + * _trying_ to connect to an authority, not necessarily if we _did_ connect + * to one. */ + if (router_digest_is_trusted_dir( + TLS_CHAN_TO_BASE(chan)->u.cell_chan.identity_digest)) + severity = LOG_WARN; + else + severity = LOG_PROTOCOL_WARN; + + if (! tor_tls_cert_is_valid(severity, link_cert, id_cert, 0)) + ERR("The link certificate was not valid"); + if (! tor_tls_cert_is_valid(severity, id_cert, id_cert, 1)) + ERR("The ID certificate was not valid"); + + chan->conn->handshake_state->authenticated = 1; + { + const digests_t *id_digests = tor_cert_get_id_digests(id_cert); + crypto_pk_t *identity_rcvd; + if (!id_digests) + ERR("Couldn't compute digests for key in ID cert"); + + identity_rcvd = tor_tls_cert_get_key(id_cert); + if (!identity_rcvd) + ERR("Internal error: Couldn't get RSA key from ID cert."); + memcpy(chan->conn->handshake_state->authenticated_peer_id, + id_digests->d[DIGEST_SHA1], DIGEST_LEN); + channel_set_circid_type(TLS_CHAN_TO_BASE(chan), identity_rcvd); + crypto_pk_free(identity_rcvd); + } + + if (connection_or_client_learned_peer_id(chan->conn, + chan->conn->handshake_state->authenticated_peer_id) < 0) + ERR("Problem setting or checking peer id"); + + log_info(LD_OR, + "Got some good certificates from %s:%d: Authenticated it.", + safe_str(chan->conn->_base.address), chan->conn->_base.port); + + chan->conn->handshake_state->id_cert = id_cert; + id_cert = NULL; + + if (!public_server_mode(get_options())) { + /* If we initiated the connection and we are not a public server, we + * aren't planning to authenticate at all. At this point we know who we + * are talking to, so we can just send a netinfo now. */ + send_netinfo = 1; + } + } else { + if (! (id_cert && auth_cert)) + ERR("The certs we wanted were missing"); + + /* Remember these certificates so we can check an AUTHENTICATE cell */ + if (! tor_tls_cert_is_valid(LOG_PROTOCOL_WARN, auth_cert, id_cert, 1)) + ERR("The authentication certificate was not valid"); + if (! tor_tls_cert_is_valid(LOG_PROTOCOL_WARN, id_cert, id_cert, 1)) + ERR("The ID certificate was not valid"); + + log_info(LD_OR, + "Got some good certificates from %s:%d: " + "Waiting for AUTHENTICATE.", + safe_str(chan->conn->_base.address), + chan->conn->_base.port); + /* XXXX check more stuff? */ + + chan->conn->handshake_state->id_cert = id_cert; + chan->conn->handshake_state->auth_cert = auth_cert; + id_cert = auth_cert = NULL; + } + + chan->conn->handshake_state->received_certs_cell = 1; + + if (send_netinfo) { + if (connection_or_send_netinfo(chan->conn) < 0) { + log_warn(LD_OR, "Couldn't send netinfo cell"); + connection_or_close_for_error(chan->conn, 0); + goto err; + } + } + + err: + tor_cert_free(id_cert); + tor_cert_free(link_cert); + tor_cert_free(auth_cert); +#undef ERR +} + +/** + * Process an AUTH_CHALLENGE cell from a channel_tls_t + * + * This function is called to handle an incoming AUTH_CHALLENGE cell on a + * channel_tls_t; if we weren't supposed to get one (for example, because we're + * not the originator of the channel), or it's ill-formed, or we aren't doing + * a v3 handshake, mark the channel. If the cell is well-formed but we don't + * want to authenticate, just drop it. If the cell is well-formed *and* we + * want to authenticate, send an AUTHENTICATE cell and then a NETINFO cell. + * + * @param cell Incoming AUTH_CHALLENGE cell to handle + * @param chan Channel that cell arrived on + */ + +static void +channel_tls_process_auth_challenge_cell(var_cell_t *cell, channel_tls_t *chan) +{ + int n_types, i, use_type = -1; + uint8_t *cp; + + tor_assert(cell); + tor_assert(chan); + tor_assert(!(TLS_CHAN_TO_BASE(chan)->is_listener)); + tor_assert(chan->conn); + +#define ERR(s) \ + do { \ + log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL, \ + "Received a bad AUTH_CHALLENGE cell from %s:%d: %s", \ + safe_str(chan->conn->_base.address), \ + chan->conn->_base.port, (s)); \ + connection_or_close_for_error(chan->conn, 0); \ + return; \ + } while (0) + + if (chan->conn->_base.state != OR_CONN_STATE_OR_HANDSHAKING_V3) + ERR("We're not currently doing a v3 handshake"); + if (chan->conn->link_proto < 3) + ERR("We're not using link protocol >= 3"); + if (!(chan->conn->handshake_state->started_here)) + ERR("We didn't originate this connection"); + if (chan->conn->handshake_state->received_auth_challenge) + ERR("We already received one"); + if (!(chan->conn->handshake_state->received_certs_cell)) + ERR("We haven't gotten a CERTS cell yet"); + if (cell->payload_len < OR_AUTH_CHALLENGE_LEN + 2) + ERR("It was too short"); + if (cell->circ_id) + ERR("It had a nonzero circuit ID"); + + n_types = ntohs(get_uint16(cell->payload + OR_AUTH_CHALLENGE_LEN)); + if (cell->payload_len < OR_AUTH_CHALLENGE_LEN + 2 + 2*n_types) + ERR("It looks truncated"); + + /* Now see if there is an authentication type we can use */ + cp = cell->payload+OR_AUTH_CHALLENGE_LEN + 2; + for (i = 0; i < n_types; ++i, cp += 2) { + uint16_t authtype = ntohs(get_uint16(cp)); + if (authtype == AUTHTYPE_RSA_SHA256_TLSSECRET) + use_type = authtype; + } + + chan->conn->handshake_state->received_auth_challenge = 1; + + if (! public_server_mode(get_options())) { + /* If we're not a public server then we don't want to authenticate on a + connection we originated, and we already sent a NETINFO cell when we + got the CERTS cell. We have nothing more to do. */ + return; + } + + if (use_type >= 0) { + log_info(LD_OR, + "Got an AUTH_CHALLENGE cell from %s:%d: Sending " + "authentication", + safe_str(chan->conn->_base.address), + chan->conn->_base.port); + + if (connection_or_send_authenticate_cell(chan->conn, use_type) < 0) { + log_warn(LD_OR, + "Couldn't send authenticate cell"); + connection_or_close_for_error(chan->conn, 0); + return; + } + } else { + log_info(LD_OR, + "Got an AUTH_CHALLENGE cell from %s:%d, but we don't " + "know any of its authentication types. Not authenticating.", + safe_str(chan->conn->_base.address), + chan->conn->_base.port); + } + + if (connection_or_send_netinfo(chan->conn) < 0) { + log_warn(LD_OR, "Couldn't send netinfo cell"); + connection_or_close_for_error(chan->conn, 0); + return; + } + +#undef ERR +} + +/** + * Process an AUTHENTICATE cell from a channel_tls_t + * + * If it's ill-formed or we weren't supposed to get one or we're not doing a + * v3 handshake, then mark the connection. If it does not authenticate the + * other side of the connection successfully (because it isn't signed right, + * we didn't get a CERTS cell, etc) mark the connection. Otherwise, accept + * the identity of the router on the other side of the connection. + * + * @param cell Incoming AUTHENTICATE cell + * @param chan Channel that cell arrived on + */ + +static void +channel_tls_process_authenticate_cell(var_cell_t *cell, channel_tls_t *chan) +{ + uint8_t expected[V3_AUTH_FIXED_PART_LEN]; + const uint8_t *auth; + int authlen; + + tor_assert(cell); + tor_assert(chan); + tor_assert(!(TLS_CHAN_TO_BASE(chan)->is_listener)); + tor_assert(chan->conn); + +#define ERR(s) \ + do { \ + log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL, \ + "Received a bad AUTHENTICATE cell from %s:%d: %s", \ + safe_str(chan->conn->_base.address), \ + chan->conn->_base.port, (s)); \ + connection_or_close_for_error(chan->conn, 0); \ + return; \ + } while (0) + + if (chan->conn->_base.state != OR_CONN_STATE_OR_HANDSHAKING_V3) + ERR("We're not doing a v3 handshake"); + if (chan->conn->link_proto < 3) + ERR("We're not using link protocol >= 3"); + if (chan->conn->handshake_state->started_here) + ERR("We originated this connection"); + if (chan->conn->handshake_state->received_authenticate) + ERR("We already got one!"); + if (chan->conn->handshake_state->authenticated) { + /* Should be impossible given other checks */ + ERR("The peer is already authenticated"); + } + if (!(chan->conn->handshake_state->received_certs_cell)) + ERR("We never got a certs cell"); + if (chan->conn->handshake_state->auth_cert == NULL) + ERR("We never got an authentication certificate"); + if (chan->conn->handshake_state->id_cert == NULL) + ERR("We never got an identity certificate"); + if (cell->payload_len < 4) + ERR("Cell was way too short"); + + auth = cell->payload; + { + uint16_t type = ntohs(get_uint16(auth)); + uint16_t len = ntohs(get_uint16(auth+2)); + if (4 + len > cell->payload_len) + ERR("Authenticator was truncated"); + + if (type != AUTHTYPE_RSA_SHA256_TLSSECRET) + ERR("Authenticator type was not recognized"); + + auth += 4; + authlen = len; + } + + if (authlen < V3_AUTH_BODY_LEN + 1) + ERR("Authenticator was too short"); + + if (connection_or_compute_authenticate_cell_body( + chan->conn, expected, sizeof(expected), NULL, 1) < 0) + ERR("Couldn't compute expected AUTHENTICATE cell body"); + + if (tor_memneq(expected, auth, sizeof(expected))) + ERR("Some field in the AUTHENTICATE cell body was not as expected"); + + { + crypto_pk_t *pk = tor_tls_cert_get_key( + chan->conn->handshake_state->auth_cert); + char d[DIGEST256_LEN]; + char *signed_data; + size_t keysize; + int signed_len; + + if (!pk) + ERR("Internal error: couldn't get RSA key from AUTH cert."); + crypto_digest256(d, (char*)auth, V3_AUTH_BODY_LEN, DIGEST_SHA256); + + keysize = crypto_pk_keysize(pk); + signed_data = tor_malloc(keysize); + signed_len = crypto_pk_public_checksig(pk, signed_data, keysize, + (char*)auth + V3_AUTH_BODY_LEN, + authlen - V3_AUTH_BODY_LEN); + crypto_pk_free(pk); + if (signed_len < 0) { + tor_free(signed_data); + ERR("Signature wasn't valid"); + } + if (signed_len < DIGEST256_LEN) { + tor_free(signed_data); + ERR("Not enough data was signed"); + } + /* Note that we deliberately allow *more* than DIGEST256_LEN bytes here, + * in case they're later used to hold a SHA3 digest or something. */ + if (tor_memneq(signed_data, d, DIGEST256_LEN)) { + tor_free(signed_data); + ERR("Signature did not match data to be signed."); + } + tor_free(signed_data); + } + + /* Okay, we are authenticated. */ + chan->conn->handshake_state->received_authenticate = 1; + chan->conn->handshake_state->authenticated = 1; + chan->conn->handshake_state->digest_received_data = 0; + { + crypto_pk_t *identity_rcvd = + tor_tls_cert_get_key(chan->conn->handshake_state->id_cert); + const digests_t *id_digests = + tor_cert_get_id_digests(chan->conn->handshake_state->id_cert); + + /* This must exist; we checked key type when reading the cert. */ + tor_assert(id_digests); + + memcpy(chan->conn->handshake_state->authenticated_peer_id, + id_digests->d[DIGEST_SHA1], DIGEST_LEN); + + channel_set_circid_type(TLS_CHAN_TO_BASE(chan), identity_rcvd); + crypto_pk_free(identity_rcvd); + + connection_or_init_conn_from_address(chan->conn, + &(chan->conn->_base.addr), + chan->conn->_base.port, + (const char*)(chan->conn->handshake_state-> + authenticated_peer_id), + 0); + + log_info(LD_OR, + "Got an AUTHENTICATE cell from %s:%d: Looks good.", + safe_str(chan->conn->_base.address), + chan->conn->_base.port); + } + +#undef ERR +} + diff --git a/src/or/channeltls.h b/src/or/channeltls.h new file mode 100644 index 0000000..3b7d6a7 --- /dev/null +++ b/src/or/channeltls.h @@ -0,0 +1,50 @@ +/* * Copyright (c) 2012, The Tor Project, Inc. */ +/* See LICENSE for licensing information */ + +/** + * \file channeltls.h + * \brief Header file for channeltls.c + **/ + +#ifndef _TOR_CHANNEL_TLS_H +#define _TOR_CHANNEL_TLS_H + +#include "or.h" +#include "channel.h" + +#define BASE_CHAN_TO_TLS(c) ((channel_tls_t *)(c)) +#define TLS_CHAN_TO_BASE(c) ((channel_t *)(c)) + +#ifdef _TOR_CHANNEL_INTERNAL + +struct channel_tls_s { + /* Base channel_t struct */ + channel_t _base; + /* or_connection_t pointer */ + or_connection_t *conn; +}; + +#endif /* _TOR_CHANNEL_INTERNAL */ + +channel_t * channel_tls_connect(const tor_addr_t *addr, uint16_t port, + const char *id_digest); +channel_t * channel_tls_get_listener(void); +channel_t * channel_tls_start_listener(void); +channel_t * channel_tls_handle_incoming(or_connection_t *orconn); + +/* Things for connection_or.c to call back into */ +ssize_t channel_tls_flush_some_cells(channel_tls_t *chan, ssize_t num_cells); +int channel_tls_more_to_flush(channel_tls_t *chan); +void channel_tls_handle_cell(cell_t *cell, or_connection_t *conn); +void channel_tls_handle_state_change_on_orconn(channel_tls_t *chan, + or_connection_t *conn, + uint8_t old_state, + uint8_t state); +void channel_tls_handle_var_cell(var_cell_t *var_cell, + or_connection_t *conn); + +/* Cleanup at shutdown */ +void channel_tls_free_all(void); + +#endif + diff --git a/src/or/connection.c b/src/or/connection.c index d64c676..8e9c701 100644 --- a/src/or/connection.c +++ b/src/or/connection.c @@ -12,6 +12,13 @@ #include "or.h" #include "buffers.h" +/* + * Define this so we get channel internal functions, since we're implementing + * part of a subclass (channel_tls_t). + */ +#define _TOR_CHANNEL_INTERNAL +#include "channel.h" +#include "channeltls.h" #include "circuitbuild.h" #include "circuitlist.h" #include "circuituse.h" @@ -257,7 +264,6 @@ or_connection_new(int socket_family) connection_init(now, TO_CONN(or_conn), CONN_TYPE_OR, socket_family); or_conn->timestamp_last_added_nonpadding = time(NULL); - or_conn->next_circ_id = crypto_rand_int(1<<15); or_conn->active_circuit_pqueue = smartlist_new(); or_conn->active_circuit_pqueue_last_recalibrated = cell_ewma_get_tick(); @@ -693,6 +699,16 @@ _connection_mark_for_close(connection_t *conn, int line, const char *file) return; } + if (conn->type == CONN_TYPE_OR) { + /* + * Bad news if this happens without telling the controlling channel; do + * this so we can find things that call this wrongly when the asserts hit. + */ + log_debug(LD_CHANNEL, + "Calling connection_mark_for_close on an OR conn at %s:%d", + file, line); + } + conn->marked_for_close = line; conn->marked_for_close_file = file; add_connection_to_closeable_list(conn); @@ -1281,12 +1297,19 @@ static int connection_init_accepted_conn(connection_t *conn, const listener_connection_t *listener) { + int rv; + connection_start_reading(conn); switch (conn->type) { case CONN_TYPE_OR: control_event_or_conn_status(TO_OR_CONN(conn), OR_CONN_EVENT_NEW, 0); - return connection_tls_start_handshake(TO_OR_CONN(conn), 1); + rv = connection_tls_start_handshake(TO_OR_CONN(conn), 1); + if (rv < 0) { + connection_or_close_for_error(TO_OR_CONN(conn), 0); + } + return rv; + break; case CONN_TYPE_AP: TO_ENTRY_CONN(conn)->isolation_flags = listener->isolation_flags; TO_ENTRY_CONN(conn)->session_group = listener->session_group; @@ -2091,7 +2114,8 @@ static int connection_counts_as_relayed_traffic(connection_t *conn, time_t now) { if (conn->type == CONN_TYPE_OR && - TO_OR_CONN(conn)->client_used + CLIENT_IDLE_TIME_FOR_PRIORITY < now) + connection_or_client_used(TO_OR_CONN(conn)) + + CLIENT_IDLE_TIME_FOR_PRIORITY < now) return 1; if (conn->type == CONN_TYPE_DIR && DIR_CONN_IS_SERVER(conn)) return 1; @@ -2688,11 +2712,14 @@ connection_handle_read_impl(connection_t *conn) before = buf_datalen(conn->inbuf); if (connection_read_to_buf(conn, &max_to_read, &socket_error) < 0) { /* There's a read error; kill the connection.*/ - if (conn->type == CONN_TYPE_OR && - conn->state == OR_CONN_STATE_CONNECTING) { - connection_or_connect_failed(TO_OR_CONN(conn), - errno_to_orconn_end_reason(socket_error), - tor_socket_strerror(socket_error)); + if (conn->type == CONN_TYPE_OR) { + connection_or_notify_error(TO_OR_CONN(conn), + socket_error != 0 ? + errno_to_orconn_end_reason(socket_error) : + END_OR_CONN_REASON_CONNRESET, + socket_error != 0 ? + tor_socket_strerror(socket_error) : + "(unknown, errno was 0)"); } if (CONN_IS_EDGE(conn)) { edge_connection_t *edge_conn = TO_EDGE_CONN(conn); @@ -3214,9 +3241,9 @@ connection_handle_write_impl(connection_t *conn, int force) if (CONN_IS_EDGE(conn)) connection_edge_end_errno(TO_EDGE_CONN(conn)); if (conn->type == CONN_TYPE_OR) - connection_or_connect_failed(TO_OR_CONN(conn), - errno_to_orconn_end_reason(e), - tor_socket_strerror(e)); + connection_or_notify_error(TO_OR_CONN(conn), + errno_to_orconn_end_reason(e), + tor_socket_strerror(e)); connection_close_immediate(conn); connection_mark_for_close(conn); @@ -3241,6 +3268,10 @@ connection_handle_write_impl(connection_t *conn, int force) connection_stop_writing(conn); if (connection_tls_continue_handshake(or_conn) < 0) { /* Don't flush; connection is dead. */ + connection_or_notify_error(or_conn, + END_OR_CONN_REASON_MISC, + "TLS error in connection_tls_" + "continue_handshake()"); connection_close_immediate(conn); connection_mark_for_close(conn); return -1; @@ -3254,19 +3285,23 @@ connection_handle_write_impl(connection_t *conn, int force) result = flush_buf_tls(or_conn->tls, conn->outbuf, max_to_write, &conn->outbuf_flushlen); - /* If we just flushed the last bytes, check if this tunneled dir - * request is done. */ + /* If we just flushed the last bytes, tell the channel on the + * or_conn to check if it needs to geoip_change_dirreq_state() */ /* XXXX move this to flushed_some or finished_flushing -NM */ - if (buf_datalen(conn->outbuf) == 0 && conn->dirreq_id) - geoip_change_dirreq_state(conn->dirreq_id, DIRREQ_TUNNELED, - DIRREQ_OR_CONN_BUFFER_FLUSHED); + if (buf_datalen(conn->outbuf) == 0 && or_conn->chan) + channel_notify_flushed(TLS_CHAN_TO_BASE(or_conn->chan)); switch (result) { CASE_TOR_TLS_ERROR_ANY: case TOR_TLS_CLOSE: - log_info(LD_NET,result!=TOR_TLS_CLOSE? + log_info(LD_NET, result != TOR_TLS_CLOSE ? "tls error. breaking.":"TLS connection closed on flush"); /* Don't flush; connection is dead. */ + connection_or_notify_error(or_conn, + END_OR_CONN_REASON_MISC, + result != TOR_TLS_CLOSE ? + "TLS error in during flush" : + "TLS closed during flush"); connection_close_immediate(conn); connection_mark_for_close(conn); return -1; @@ -3325,8 +3360,16 @@ connection_handle_write_impl(connection_t *conn, int force) if (result > 0) { /* If we wrote any bytes from our buffer, then call the appropriate * functions. */ - if (connection_flushed_some(conn) < 0) + if (connection_flushed_some(conn) < 0) { + if (connection_speaks_cells(conn)) { + connection_or_notify_error(TO_OR_CONN(conn), + END_OR_CONN_REASON_MISC, + "Got error back from " + "connection_flushed_some()"); + } + connection_mark_for_close(conn); + } } if (!connection_wants_to_flush(conn)) { /* it's done flushing */ @@ -4125,7 +4168,6 @@ assert_connection_ok(connection_t *conn, time_t now) case CONN_TYPE_OR: tor_assert(conn->state >= _OR_CONN_STATE_MIN); tor_assert(conn->state <= _OR_CONN_STATE_MAX); - tor_assert(TO_OR_CONN(conn)->n_circuits >= 0); break; case CONN_TYPE_EXIT: tor_assert(conn->state >= _EXIT_CONN_STATE_MIN); diff --git a/src/or/connection_or.c b/src/or/connection_or.c index dbd8757..a3df775 100644 --- a/src/or/connection_or.c +++ b/src/or/connection_or.c @@ -12,6 +12,13 @@ #include "or.h" #include "buffers.h" +/* + * Define this so we get channel internal functions, since we're implementing + * part of a subclass (channel_tls_t). + */ +#define _TOR_CHANNEL_INTERNAL +#include "channel.h" +#include "channeltls.h" #include "circuitbuild.h" #include "circuitlist.h" #include "command.h" @@ -43,6 +50,17 @@ static int connection_or_check_valid_tls_handshake(or_connection_t *conn, static void connection_or_tls_renegotiated_cb(tor_tls_t *tls, void *_conn); +static unsigned int +connection_or_is_bad_for_new_circs(or_connection_t *or_conn); +static void connection_or_mark_bad_for_new_circs(or_connection_t *or_conn); + +/* + * Call this when changing connection state, so notifications to the owning + * channel can be handled. + */ + +static void connection_or_change_state(or_connection_t *conn, uint8_t state); + #ifdef USE_BUFFEREVENTS static void connection_or_handle_event_cb(struct bufferevent *bufev, short event, void *arg); @@ -127,8 +145,11 @@ connection_or_set_identity_digest(or_connection_t *conn, const char *digest) return; /* If the identity was set previously, remove the old mapping. */ - if (! tor_digest_is_zero(conn->identity_digest)) + if (! tor_digest_is_zero(conn->identity_digest)) { connection_or_remove_from_identity_map(conn); + if (conn->chan) + channel_clear_identity_digest(TLS_CHAN_TO_BASE(conn->chan)); + } memcpy(conn->identity_digest, digest, DIGEST_LEN); @@ -139,6 +160,10 @@ connection_or_set_identity_digest(or_connection_t *conn, const char *digest) tmp = digestmap_set(orconn_identity_map, digest, conn); conn->next_with_same_id = tmp; + /* Deal with channels */ + if (conn->chan) + channel_set_identity_digest(TLS_CHAN_TO_BASE(conn->chan), digest); + #if 1 /* Testing code to check for bugs in representation. */ for (; tmp; tmp = tmp->next_with_same_id) { @@ -282,6 +307,40 @@ connection_or_report_broken_states(int severity, int domain) smartlist_free(items); } +/** Call this to change or_connection_t states, so the owning channel_tls_t can + * be notified. + */ + +static void +connection_or_change_state(or_connection_t *conn, uint8_t state) +{ + uint8_t old_state; + + tor_assert(conn); + + old_state = conn->_base.state; + conn->_base.state = state; + + if (conn->chan) + channel_tls_handle_state_change_on_orconn(conn->chan, conn, + old_state, state); +} + +/** Return the number of circuits using an or_connection_t; this used to + * be an or_connection_t field, but it got moved to channel_t and we + * shouldn't maintain two copies. */ + +int +connection_or_get_num_circuits(or_connection_t *conn) +{ + tor_assert(conn); + + if (conn->chan) { + tor_assert(!(TLS_CHAN_TO_BASE(conn->chan)->is_listener)); + return TLS_CHAN_TO_BASE(conn->chan)->u.cell_chan.n_circuits; + } else return 0; +} + /**************************************************************/ /** Pack the cell_t host-order structure src into network-order @@ -345,8 +404,11 @@ var_cell_free(var_cell_t *cell) int connection_or_reached_eof(or_connection_t *conn) { + tor_assert(conn); + log_info(LD_OR,"OR connection reached EOF. Closing."); - connection_mark_for_close(TO_CONN(conn)); + connection_or_close_normally(conn, 1); + return 0; } @@ -375,9 +437,12 @@ connection_or_process_inbuf(or_connection_t *conn) tor_assert(TO_CONN(conn)->proxy_state == PROXY_CONNECTED); if (connection_tls_start_handshake(conn, 0) < 0) ret = -1; + /* Touch the channel's active timestamp if there is one */ + if (conn->chan) + channel_timestamp_active(TLS_CHAN_TO_BASE(conn->chan)); } if (ret < 0) { - connection_mark_for_close(TO_CONN(conn)); + connection_or_close_for_error(conn, 0); } return ret; @@ -410,7 +475,7 @@ connection_or_process_inbuf(or_connection_t *conn) connection_or_nonopen_was_started_here(conn) ? "to" : "from", conn->_base.address, conn->_base.port, conn_state_to_string(conn->_base.type, conn->_base.state)); - connection_mark_for_close(TO_CONN(conn)); + connection_or_close_for_error(conn, 0); ret = -1; } @@ -430,18 +495,31 @@ connection_or_process_inbuf(or_connection_t *conn) int connection_or_flushed_some(or_connection_t *conn) { - size_t datalen = connection_get_outbuf_len(TO_CONN(conn)); + size_t datalen, temp; + ssize_t n, flushed; + /* If we're under the low water mark, add cells until we're just over the * high water mark. */ + datalen = connection_get_outbuf_len(TO_CONN(conn)); if (datalen < OR_CONN_LOWWATER) { - ssize_t n = CEIL_DIV(OR_CONN_HIGHWATER - datalen, CELL_NETWORK_SIZE); - time_t now = approx_time(); - while (conn->active_circuits && n > 0) { - int flushed; - flushed = connection_or_flush_from_first_active_circuit(conn, 1, now); - n -= flushed; + while ((conn->chan) && channel_tls_more_to_flush(conn->chan)) { + /* Compute how many more cells we want at most */ + n = CEIL_DIV(OR_CONN_HIGHWATER - datalen, CELL_NETWORK_SIZE); + /* Bail out if we don't want any more */ + if (n <= 0) break; + /* We're still here; try to flush some more cells */ + flushed = channel_tls_flush_some_cells(conn->chan, n); + /* Bail out if it says it didn't flush anything */ + if (flushed <= 0) break; + /* How much in the outbuf now? */ + temp = connection_get_outbuf_len(TO_CONN(conn)); + /* Bail out if we didn't actually increase the outbuf size */ + if (temp <= datalen) break; + /* Update datalen for the next iteration */ + datalen = temp; } } + return 0; } @@ -480,6 +558,7 @@ connection_or_finished_connecting(or_connection_t *or_conn) { const int proxy_type = or_conn->proxy_type; connection_t *conn; + tor_assert(or_conn); conn = TO_CONN(or_conn); tor_assert(conn->state == OR_CONN_STATE_CONNECTING); @@ -491,18 +570,18 @@ connection_or_finished_connecting(or_connection_t *or_conn) if (proxy_type != PROXY_NONE) { /* start proxy handshake */ if (connection_proxy_connect(conn, proxy_type) < 0) { - connection_mark_for_close(conn); + connection_or_close_for_error(or_conn, 0); return -1; } connection_start_reading(conn); - conn->state = OR_CONN_STATE_PROXY_HANDSHAKING; + connection_or_change_state(or_conn, OR_CONN_STATE_PROXY_HANDSHAKING); return 0; } if (connection_tls_start_handshake(or_conn, 0) < 0) { /* TLS handshaking error of some kind. */ - connection_mark_for_close(conn); + connection_or_close_for_error(or_conn, 0); return -1; } return 0; @@ -516,11 +595,14 @@ connection_or_about_to_close(or_connection_t *or_conn) time_t now = time(NULL); connection_t *conn = TO_CONN(or_conn); + /* Tell the controlling channel we're closed */ + if (or_conn->chan) { + channel_closed(TLS_CHAN_TO_BASE(or_conn->chan)); + or_conn->chan = NULL; + } + /* Remember why we're closing this connection. */ if (conn->state != OR_CONN_STATE_OPEN) { - /* Inform any pending (not attached) circs that they should - * give up. */ - circuit_n_conn_done(TO_OR_CONN(conn), 0); /* now mark things down as needed */ if (connection_or_nonopen_was_started_here(or_conn)) { const or_options_t *options = get_options(); @@ -548,9 +630,6 @@ connection_or_about_to_close(or_connection_t *or_conn) control_event_or_conn_status(or_conn, OR_CONN_EVENT_CLOSED, tls_error_to_orconn_end_reason(or_conn->tls_error)); } - /* Now close all the attached circuits on it. */ - circuit_unlink_all_from_or_conn(TO_OR_CONN(conn), - END_CIRC_REASON_OR_CONN_CLOSED); } /** Return 1 if identity digest id_digest is known to be a @@ -708,152 +787,26 @@ connection_or_init_conn_from_address(or_connection_t *conn, } } -/** Return true iff a is "better" than b for new circuits. - * - * A more canonical connection is always better than a less canonical - * connection. That aside, a connection is better if it has circuits and the - * other does not, or if it was created more recently. - * - * Requires that both input connections are open; not is_bad_for_new_circs, - * and not impossibly non-canonical. - * - * If forgive_new_connections is true, then we do not call - * abetter than b simply because b has no circuits, - * unless b is also relatively old. - */ -static int -connection_or_is_better(time_t now, - const or_connection_t *a, - const or_connection_t *b, - int forgive_new_connections) -{ - int newer; -/** Do not definitively deprecate a new connection with no circuits on it - * until this much time has passed. */ -#define NEW_CONN_GRACE_PERIOD (15*60) - - if (b->is_canonical && !a->is_canonical) - return 0; /* A canonical connection is better than a non-canonical - * one, no matter how new it is or which has circuits. */ - - newer = b->_base.timestamp_created < a->_base.timestamp_created; - - if ( - /* We prefer canonical connections regardless of newness. */ - (!b->is_canonical && a->is_canonical) || - /* If both have circuits we prefer the newer: */ - (b->n_circuits && a->n_circuits && newer) || - /* If neither has circuits we prefer the newer: */ - (!b->n_circuits && !a->n_circuits && newer)) - return 1; +/** These just pass all the is_bad_for_new_circs manipulation on to + * channel_t */ - /* If one has no circuits and the other does... */ - if (!b->n_circuits && a->n_circuits) { - /* Then it's bad, unless it's in its grace period and we're forgiving. */ - if (forgive_new_connections && - now < b->_base.timestamp_created + NEW_CONN_GRACE_PERIOD) - return 0; - else - return 1; - } +static unsigned int +connection_or_is_bad_for_new_circs(or_connection_t *or_conn) +{ + tor_assert(or_conn); - return 0; + if (or_conn->chan) + return channel_is_bad_for_new_circs(TLS_CHAN_TO_BASE(or_conn->chan)); + else return 0; } -/** Return the OR connection we should use to extend a circuit to the router - * whose identity is digest, and whose address we believe (or have been - * told in an extend cell) is target_addr. If there is no good - * connection, set *msg_out to a message describing the connection's - * state and our next action, and set launch_out to a boolean for - * whether we should launch a new connection or not. - */ -or_connection_t * -connection_or_get_for_extend(const char *digest, - const tor_addr_t *target_addr, - const char **msg_out, - int *launch_out) +static void +connection_or_mark_bad_for_new_circs(or_connection_t *or_conn) { - or_connection_t *conn, *best=NULL; - int n_inprogress_goodaddr = 0, n_old = 0, n_noncanonical = 0, n_possible = 0; - time_t now = approx_time(); - - tor_assert(msg_out); - tor_assert(launch_out); - - if (!orconn_identity_map) { - *msg_out = "Router not connected (nothing is). Connecting."; - *launch_out = 1; - return NULL; - } - - conn = digestmap_get(orconn_identity_map, digest); - - for (; conn; conn = conn->next_with_same_id) { - tor_assert(conn->_base.magic == OR_CONNECTION_MAGIC); - tor_assert(conn->_base.type == CONN_TYPE_OR); - tor_assert(tor_memeq(conn->identity_digest, digest, DIGEST_LEN)); - if (conn->_base.marked_for_close) - continue; - /* Never return a connection on which the other end appears to be - * a client. */ - if (conn->is_connection_with_client) { - continue; - } - /* Never return a non-open connection. */ - if (conn->_base.state != OR_CONN_STATE_OPEN) { - /* If the address matches, don't launch a new connection for this - * circuit. */ - if (!tor_addr_compare(&conn->real_addr, target_addr, CMP_EXACT)) - ++n_inprogress_goodaddr; - continue; - } - /* Never return a connection that shouldn't be used for circs. */ - if (conn->is_bad_for_new_circs) { - ++n_old; - continue; - } - /* Never return a non-canonical connection using a recent link protocol - * if the address is not what we wanted. - * - * (For old link protocols, we can't rely on is_canonical getting - * set properly if we're talking to the right address, since we might - * have an out-of-date descriptor, and we will get no NETINFO cell to - * tell us about the right address.) */ - if (!conn->is_canonical && conn->link_proto >= 2 && - tor_addr_compare(&conn->real_addr, target_addr, CMP_EXACT)) { - ++n_noncanonical; - continue; - } - - ++n_possible; - - if (!best) { - best = conn; /* If we have no 'best' so far, this one is good enough. */ - continue; - } - - if (connection_or_is_better(now, conn, best, 0)) - best = conn; - } + tor_assert(or_conn); - if (best) { - *msg_out = "Connection is fine; using it."; - *launch_out = 0; - return best; - } else if (n_inprogress_goodaddr) { - *msg_out = "Connection in progress; waiting."; - *launch_out = 0; - return NULL; - } else if (n_old || n_noncanonical) { - *msg_out = "Connections all too old, or too non-canonical. " - " Launching a new one."; - *launch_out = 1; - return NULL; - } else { - *msg_out = "Not connected. Connecting."; - *launch_out = 1; - return NULL; - } + if (or_conn->chan) + channel_mark_bad_for_new_circs(TLS_CHAN_TO_BASE(or_conn->chan)); } /** How old do we let a connection to an OR get before deciding it's @@ -874,8 +827,8 @@ connection_or_get_for_extend(const char *digest, * - all open non-canonical connections for which a 'better' non-canonical * connection exists to the same router at the same address. * - * See connection_or_is_better() for our idea of what makes one OR connection - * better than another. + * See channel_is_better() in channel.c for our idea of what makes one OR + * connection better than another. */ static void connection_or_group_set_badness(or_connection_t *head, int force) @@ -888,7 +841,7 @@ connection_or_group_set_badness(or_connection_t *head, int force) * everything else is. */ for (or_conn = head; or_conn; or_conn = or_conn->next_with_same_id) { if (or_conn->_base.marked_for_close || - or_conn->is_bad_for_new_circs) + connection_or_is_bad_for_new_circs(or_conn)) continue; if (force || or_conn->_base.timestamp_created + TIME_BEFORE_OR_CONN_IS_TOO_OLD @@ -898,10 +851,10 @@ connection_or_group_set_badness(or_connection_t *head, int force) "(fd %d, %d secs old).", or_conn->_base.address, or_conn->_base.port, or_conn->_base.s, (int)(now - or_conn->_base.timestamp_created)); - or_conn->is_bad_for_new_circs = 1; + connection_or_mark_bad_for_new_circs(or_conn); } - if (or_conn->is_bad_for_new_circs) { + if (connection_or_is_bad_for_new_circs(or_conn)) { ++n_old; } else if (or_conn->_base.state != OR_CONN_STATE_OPEN) { ++n_inprogress; @@ -916,7 +869,7 @@ connection_or_group_set_badness(or_connection_t *head, int force) * expire everything that's worse, and find the very best if we can. */ for (or_conn = head; or_conn; or_conn = or_conn->next_with_same_id) { if (or_conn->_base.marked_for_close || - or_conn->is_bad_for_new_circs) + connection_or_is_bad_for_new_circs(or_conn)) continue; /* This one doesn't need to be marked bad. */ if (or_conn->_base.state != OR_CONN_STATE_OPEN) continue; /* Don't mark anything bad until we have seen what happens @@ -930,12 +883,17 @@ connection_or_group_set_badness(or_connection_t *head, int force) "another connection to that OR that is.", or_conn->_base.address, or_conn->_base.port, or_conn->_base.s, (int)(now - or_conn->_base.timestamp_created)); - or_conn->is_bad_for_new_circs = 1; + connection_or_mark_bad_for_new_circs(or_conn); continue; } - if (!best || connection_or_is_better(now, or_conn, best, 0)) + if (!best || + channel_is_better(now, + TLS_CHAN_TO_BASE(or_conn->chan), + TLS_CHAN_TO_BASE(best->chan), + 0)) { best = or_conn; + } } if (!best) @@ -957,10 +915,13 @@ connection_or_group_set_badness(or_connection_t *head, int force) */ for (or_conn = head; or_conn; or_conn = or_conn->next_with_same_id) { if (or_conn->_base.marked_for_close || - or_conn->is_bad_for_new_circs || + connection_or_is_bad_for_new_circs(or_conn) || or_conn->_base.state != OR_CONN_STATE_OPEN) continue; - if (or_conn != best && connection_or_is_better(now, best, or_conn, 1)) { + if (or_conn != best && + channel_is_better(now, + TLS_CHAN_TO_BASE(best->chan), + TLS_CHAN_TO_BASE(or_conn->chan), 1)) { /* This isn't the best conn, _and_ the best conn is better than it, even when we're being forgiving. */ if (best->is_canonical) { @@ -971,7 +932,7 @@ connection_or_group_set_badness(or_connection_t *head, int force) or_conn->_base.address, or_conn->_base.port, or_conn->_base.s, (int)(now - or_conn->_base.timestamp_created), best->_base.s, (int)(now - best->_base.timestamp_created)); - or_conn->is_bad_for_new_circs = 1; + connection_or_mark_bad_for_new_circs(or_conn); } else if (!tor_addr_compare(&or_conn->real_addr, &best->real_addr, CMP_EXACT)) { log_info(LD_OR, @@ -981,7 +942,7 @@ connection_or_group_set_badness(or_connection_t *head, int force) or_conn->_base.address, or_conn->_base.port, or_conn->_base.s, (int)(now - or_conn->_base.timestamp_created), best->_base.s, (int)(now - best->_base.timestamp_created)); - or_conn->is_bad_for_new_circs = 1; + connection_or_mark_bad_for_new_circs(or_conn); } } } @@ -1019,8 +980,43 @@ connection_or_connect_failed(or_connection_t *conn, control_event_bootstrap_problem(msg, reason); } +/** conn got an error in connection_handle_read_impl() or + * connection_handle_write_impl() and is going to die soon. + * + * reason specifies the or_conn_end_reason for the failure; + * msg specifies the strerror-style error message. + */ +void +connection_or_notify_error(or_connection_t *conn, + int reason, const char *msg) +{ + channel_t *chan; + + tor_assert(conn); + + /* If we're connecting, call connect_failed() too */ + if (TO_CONN(conn)->state == OR_CONN_STATE_CONNECTING) + connection_or_connect_failed(conn, reason, msg); + + /* Tell the controlling channel if we have one */ + if (conn->chan) { + chan = TLS_CHAN_TO_BASE(conn->chan); + /* This shouldn't ever happen in the listening state */ + tor_assert(chan->state != CHANNEL_STATE_LISTENING); + /* Don't transition if we're already in closing, closed or error */ + if (!(chan->state == CHANNEL_STATE_CLOSING || + chan->state == CHANNEL_STATE_CLOSED || + chan->state == CHANNEL_STATE_ERROR)) { + channel_close_for_error(chan); + } + } + + /* No need to mark for error because connection.c is about to do that */ +} + /** Launch a new OR connection to addr:port and expect to - * handshake with an OR with identity digest id_digest. + * handshake with an OR with identity digest id_digest. Optionally, + * pass in a pointer to a channel using this connection. * * If id_digest is me, do nothing. If we're already connected to it, * return that connection. If the connect() is in progress, set the @@ -1035,7 +1031,8 @@ connection_or_connect_failed(or_connection_t *conn, */ or_connection_t * connection_or_connect(const tor_addr_t *_addr, uint16_t port, - const char *id_digest) + const char *id_digest, + channel_tls_t *chan) { or_connection_t *conn; const or_options_t *options = get_options(); @@ -1058,9 +1055,17 @@ connection_or_connect(const tor_addr_t *_addr, uint16_t port, conn = or_connection_new(tor_addr_family(&addr)); - /* set up conn so it's got all the data we need to remember */ + /* + * Set up conn so it's got all the data we need to remember for channels + * + * This stuff needs to happen before connection_or_init_conn_from_address() + * so connection_or_set_identity_digest() and such know where to look to + * keep the channel up to date. + */ + conn->chan = chan; + chan->conn = conn; connection_or_init_conn_from_address(conn, &addr, port, id_digest, 1); - conn->_base.state = OR_CONN_STATE_CONNECTING; + connection_or_change_state(conn, OR_CONN_STATE_CONNECTING); control_event_or_conn_status(conn, OR_CONN_EVENT_LAUNCHED, 0); conn->is_outgoing = 1; @@ -1129,6 +1134,56 @@ connection_or_connect(const tor_addr_t *_addr, uint16_t port, return conn; } +/** Mark orconn for close and transition the associated channel, if any, to + * the closing state. + */ + +void +connection_or_close_normally(or_connection_t *orconn, int flush) +{ + channel_t *chan = NULL; + + tor_assert(orconn); + if (flush) connection_mark_and_flush(TO_CONN(orconn)); + else connection_mark_for_close(TO_CONN(orconn)); + if (orconn->chan) { + chan = TLS_CHAN_TO_BASE(orconn->chan); + /* This shouldn't ever happen in the listening state */ + tor_assert(chan->state != CHANNEL_STATE_LISTENING); + /* Don't transition if we're already in closing, closed or error */ + if (!(chan->state == CHANNEL_STATE_CLOSING || + chan->state == CHANNEL_STATE_CLOSED || + chan->state == CHANNEL_STATE_ERROR)) { + channel_close_from_lower_layer(chan); + } + } +} + +/** Mark orconn for close and transition the associated channel, if any, to + * the error state. + */ + +void +connection_or_close_for_error(or_connection_t *orconn, int flush) +{ + channel_t *chan = NULL; + + tor_assert(orconn); + if (flush) connection_mark_and_flush(TO_CONN(orconn)); + else connection_mark_for_close(TO_CONN(orconn)); + if (orconn->chan) { + chan = TLS_CHAN_TO_BASE(orconn->chan); + /* This shouldn't ever happen in the listening state */ + tor_assert(chan->state != CHANNEL_STATE_LISTENING); + /* Don't transition if we're already in closing, closed or error */ + if (!(chan->state == CHANNEL_STATE_CLOSING || + chan->state == CHANNEL_STATE_CLOSED || + chan->state == CHANNEL_STATE_ERROR)) { + channel_close_for_error(chan); + } + } +} + /** Begin the tls handshake with conn. receiving is 0 if * we initiated the connection, else it's 1. * @@ -1140,7 +1195,23 @@ connection_or_connect(const tor_addr_t *_addr, uint16_t port, int connection_tls_start_handshake(or_connection_t *conn, int receiving) { - conn->_base.state = OR_CONN_STATE_TLS_HANDSHAKING; + channel_t *chan_listener, *chan; + + /* Incoming connections will need a new channel passed to the + * channel_tls_listener */ + if (receiving) { + /* It shouldn't already be set */ + tor_assert(!(conn->chan)); + chan_listener = channel_tls_get_listener(); + if (!chan_listener) { + chan_listener = channel_tls_start_listener(); + command_setup_listener(chan_listener); + } + chan = channel_tls_handle_incoming(conn); + channel_queue_incoming(chan_listener, chan); + } + + connection_or_change_state(conn, OR_CONN_STATE_TLS_HANDSHAKING); tor_assert(!conn->tls); conn->tls = tor_tls_new(conn->_base.s, receiving); if (!conn->tls) { @@ -1201,7 +1272,7 @@ connection_or_tls_renegotiated_cb(tor_tls_t *tls, void *_conn) if (connection_tls_finish_handshake(conn) < 0) { /* XXXX_TLS double-check that it's ok to do this from inside read. */ /* XXXX_TLS double-check that this verifies certificates. */ - connection_mark_for_close(TO_CONN(conn)); + connection_or_close_for_error(conn, 0); } } @@ -1242,7 +1313,8 @@ connection_tls_continue_handshake(or_connection_t *conn) } else { log_debug(LD_OR, "Done with initial SSL handshake (client-side)." " Requesting renegotiation."); - conn->_base.state = OR_CONN_STATE_TLS_CLIENT_RENEGOTIATING; + connection_or_change_state(conn, + OR_CONN_STATE_TLS_CLIENT_RENEGOTIATING); goto again; } } @@ -1254,7 +1326,8 @@ connection_tls_continue_handshake(or_connection_t *conn) tor_tls_set_renegotiate_callback(conn->tls, connection_or_tls_renegotiated_cb, conn); - conn->_base.state = OR_CONN_STATE_TLS_SERVER_RENEGOTIATING; + connection_or_change_state(conn, + OR_CONN_STATE_TLS_SERVER_RENEGOTIATING); connection_stop_writing(TO_CONN(conn)); connection_start_reading(TO_CONN(conn)); return 0; @@ -1287,7 +1360,7 @@ connection_or_handle_event_cb(struct bufferevent *bufev, short event, if (conn->_base.state == OR_CONN_STATE_TLS_HANDSHAKING) { if (tor_tls_finish_handshake(conn->tls) < 0) { log_warn(LD_OR, "Problem finishing handshake"); - connection_mark_for_close(TO_CONN(conn)); + connection_or_close_for_error(conn, 0); return; } } @@ -1298,14 +1371,15 @@ connection_or_handle_event_cb(struct bufferevent *bufev, short event, if (tor_tls_received_v3_certificate(conn->tls)) { log_info(LD_OR, "Client got a v3 cert!"); if (connection_or_launch_v3_or_handshake(conn) < 0) - connection_mark_for_close(TO_CONN(conn)); + connection_or_close_for_error(conn, 0); return; } else { - conn->_base.state = OR_CONN_STATE_TLS_CLIENT_RENEGOTIATING; + connection_or_change_state(conn, + OR_CONN_STATE_TLS_CLIENT_RENEGOTIATING); tor_tls_unblock_renegotiation(conn->tls); if (bufferevent_ssl_renegotiate(conn->_base.bufev)<0) { log_warn(LD_OR, "Start_renegotiating went badly."); - connection_mark_for_close(TO_CONN(conn)); + connection_or_close_for_error(conn, 0); } tor_tls_unblock_renegotiation(conn->tls); return; /* ???? */ @@ -1320,7 +1394,8 @@ connection_or_handle_event_cb(struct bufferevent *bufev, short event, tor_tls_set_renegotiate_callback(conn->tls, connection_or_tls_renegotiated_cb, conn); - conn->_base.state = OR_CONN_STATE_TLS_SERVER_RENEGOTIATING; + connection_or_change_state(conn, + OR_CONN_STATE_TLS_SERVER_RENEGOTIATING); } else if (handshakes == 2) { /* v2 handshake, as a server. Two handshakes happened already, * so we treat renegotiation as done. @@ -1329,18 +1404,18 @@ connection_or_handle_event_cb(struct bufferevent *bufev, short event, } else if (handshakes > 2) { log_warn(LD_OR, "More than two handshakes done on connection. " "Closing."); - connection_mark_for_close(TO_CONN(conn)); + connection_or_close_for_error(conn, 0); } else { log_warn(LD_BUG, "We were unexpectedly told that a connection " "got %d handshakes. Closing.", handshakes); - connection_mark_for_close(TO_CONN(conn)); + connection_or_close_for_error(conn, 0); } return; } } connection_watch_events(TO_CONN(conn), READ_EVENT|WRITE_EVENT); if (connection_tls_finish_handshake(conn) < 0) - connection_mark_for_close(TO_CONN(conn)); /* ???? */ + connection_or_close_for_error(conn, 0); /* ???? */ return; } @@ -1370,29 +1445,6 @@ connection_or_nonopen_was_started_here(or_connection_t *conn) return !tor_tls_is_server(conn->tls); } -/** Set the circid_type field of conn (which determines which part of - * the circuit ID space we're willing to use) based on comparing our ID to - * identity_rcvd */ -void -connection_or_set_circid_type(or_connection_t *conn, - crypto_pk_t *identity_rcvd) -{ - const int started_here = connection_or_nonopen_was_started_here(conn); - crypto_pk_t *our_identity = - started_here ? get_tlsclient_identity_key() : - get_server_identity_key(); - - if (identity_rcvd) { - if (crypto_pk_cmp_keys(our_identity, identity_rcvd)<0) { - conn->circ_id_type = CIRC_ID_TYPE_LOWER; - } else { - conn->circ_id_type = CIRC_ID_TYPE_HIGHER; - } - } else { - conn->circ_id_type = CIRC_ID_TYPE_NEITHER; - } -} - /** Conn just completed its handshake. Return 0 if all is well, and * return -1 if he is lying, broken, or otherwise something is wrong. * @@ -1470,7 +1522,8 @@ connection_or_check_valid_tls_handshake(or_connection_t *conn, memset(digest_rcvd_out, 0, DIGEST_LEN); } - connection_or_set_circid_type(conn, identity_rcvd); + tor_assert(conn->chan); + channel_set_circid_type(TLS_CHAN_TO_BASE(conn->chan), identity_rcvd); crypto_pk_free(identity_rcvd); if (started_here) @@ -1547,6 +1600,19 @@ connection_or_client_learned_peer_id(or_connection_t *conn, return 0; } +/** Return when a client used this, for connection.c, since client_used + * is now one of the timestamps of channel_t */ + +time_t +connection_or_client_used(or_connection_t *conn) +{ + tor_assert(conn); + + if (conn->chan) { + return channel_when_last_client(TLS_CHAN_TO_BASE(conn->chan)); + } else return 0; +} + /** The v1/v2 TLS handshake is finished. * * Make sure we are happy with the person we just handshaked with. @@ -1588,7 +1654,7 @@ connection_tls_finish_handshake(or_connection_t *conn) tor_tls_block_renegotiation(conn->tls); return connection_or_set_state_open(conn); } else { - conn->_base.state = OR_CONN_STATE_OR_HANDSHAKING_V2; + connection_or_change_state(conn, OR_CONN_STATE_OR_HANDSHAKING_V2); if (connection_init_or_handshake_state(conn, started_here) < 0) return -1; if (!started_here) { @@ -1613,7 +1679,7 @@ connection_or_launch_v3_or_handshake(or_connection_t *conn) circuit_build_times_network_is_live(&circ_times); - conn->_base.state = OR_CONN_STATE_OR_HANDSHAKING_V3; + connection_or_change_state(conn, OR_CONN_STATE_OR_HANDSHAKING_V3); if (connection_init_or_handshake_state(conn, 1) < 0) return -1; @@ -1732,35 +1798,9 @@ or_handshake_state_record_var_cell(or_handshake_state_t *state, int connection_or_set_state_open(or_connection_t *conn) { - int started_here = connection_or_nonopen_was_started_here(conn); - time_t now = time(NULL); - conn->_base.state = OR_CONN_STATE_OPEN; + connection_or_change_state(conn, OR_CONN_STATE_OPEN); control_event_or_conn_status(conn, OR_CONN_EVENT_CONNECTED, 0); - if (started_here) { - circuit_build_times_network_is_live(&circ_times); - rep_hist_note_connect_succeeded(conn->identity_digest, now); - if (entry_guard_register_connect_status(conn->identity_digest, - 1, 0, now) < 0) { - /* Close any circuits pending on this conn. We leave it in state - * 'open' though, because it didn't actually *fail* -- we just - * chose not to use it. (Otherwise - * connection_about_to_close_connection() will call a big pile of - * functions to indicate we shouldn't try it again.) */ - log_debug(LD_OR, "New entry guard was reachable, but closing this " - "connection so we can retry the earlier entry guards."); - circuit_n_conn_done(conn, 0); - return -1; - } - router_set_status(conn->identity_digest, 1); - } else { - /* only report it to the geoip module if it's not a known router */ - if (!router_get_by_id_digest(conn->identity_digest)) { - geoip_note_client_seen(GEOIP_CLIENT_CONNECT, &TO_CONN(conn)->addr, - now); - } - } - or_handshake_state_free(conn->handshake_state); conn->handshake_state = NULL; IF_HAS_BUFFEREVENT(TO_CONN(conn), { @@ -1769,8 +1809,6 @@ connection_or_set_state_open(or_connection_t *conn) connection_start_reading(TO_CONN(conn)); } - circuit_n_conn_done(conn, 1); /* send the pending creates, if any. */ - return 0; } @@ -1790,6 +1828,10 @@ connection_or_write_cell_to_buf(const cell_t *cell, or_connection_t *conn) connection_write_to_buf(networkcell.body, CELL_NETWORK_SIZE, TO_CONN(conn)); + /* Touch the channel's active timestamp if there is one */ + if (conn->chan) + channel_timestamp_active(TLS_CHAN_TO_BASE(conn->chan)); + if (conn->_base.state == OR_CONN_STATE_OR_HANDSHAKING_V3) or_handshake_state_record_cell(conn->handshake_state, cell, 0); @@ -1816,6 +1858,10 @@ connection_or_write_var_cell_to_buf(const var_cell_t *cell, or_handshake_state_record_var_cell(conn->handshake_state, cell, 0); if (cell->command != CELL_PADDING) conn->timestamp_last_added_nonpadding = approx_time(); + + /* Touch the channel's active timestamp if there is one */ + if (conn->chan) + channel_timestamp_active(TLS_CHAN_TO_BASE(conn->chan)); } /** See whether there's a variable-length cell waiting on or_conn's @@ -1852,8 +1898,13 @@ connection_or_process_cells_from_inbuf(or_connection_t *conn) if (connection_fetch_var_cell_from_buf(conn, &var_cell)) { if (!var_cell) return 0; /* not yet. */ + + /* Touch the channel's active timestamp if there is one */ + if (conn->chan) + channel_timestamp_active(TLS_CHAN_TO_BASE(conn->chan)); + circuit_build_times_network_is_live(&circ_times); - command_process_var_cell(var_cell, conn); + channel_tls_handle_var_cell(var_cell, conn); var_cell_free(var_cell); } else { char buf[CELL_NETWORK_SIZE]; @@ -1862,6 +1913,10 @@ connection_or_process_cells_from_inbuf(or_connection_t *conn) < CELL_NETWORK_SIZE) /* whole response available? */ return 0; /* not yet */ + /* Touch the channel's active timestamp if there is one */ + if (conn->chan) + channel_timestamp_active(TLS_CHAN_TO_BASE(conn->chan)); + circuit_build_times_network_is_live(&circ_times); connection_fetch_from_buf(buf, CELL_NETWORK_SIZE, TO_CONN(conn)); @@ -1869,34 +1924,11 @@ connection_or_process_cells_from_inbuf(or_connection_t *conn) * network-order string) */ cell_unpack(&cell, buf); - command_process_cell(&cell, conn); + channel_tls_handle_cell(&cell, conn); } } } -/** Write a destroy cell with circ ID circ_id and reason reason - * onto OR connection conn. Don't perform range-checking on reason: - * we may want to propagate reasons from other cells. - * - * Return 0. - */ -int -connection_or_send_destroy(circid_t circ_id, or_connection_t *conn, int reason) -{ - cell_t cell; - - tor_assert(conn); - - memset(&cell, 0, sizeof(cell_t)); - cell.circ_id = circ_id; - cell.command = CELL_DESTROY; - cell.payload[0] = (uint8_t) reason; - log_debug(LD_OR,"Sending destroy (circID %d).", circ_id); - - connection_or_write_cell_to_buf(&cell, conn); - return 0; -} - /** Array of recognized link protocol versions. */ static const uint16_t or_protocol_versions[] = { 1, 2, 3 }; /** Number of versions in or_protocol_versions. */ diff --git a/src/or/connection_or.h b/src/or/connection_or.h index 3e98f5c..22126b0 100644 --- a/src/or/connection_or.h +++ b/src/or/connection_or.h @@ -33,8 +33,14 @@ void connection_or_update_token_buckets(smartlist_t *conns, void connection_or_connect_failed(or_connection_t *conn, int reason, const char *msg); +void connection_or_notify_error(or_connection_t *conn, + int reason, const char *msg); or_connection_t *connection_or_connect(const tor_addr_t *addr, uint16_t port, - const char *id_digest); + const char *id_digest, + channel_tls_t *chan); + +void connection_or_close_normally(or_connection_t *orconn, int flush); +void connection_or_close_for_error(or_connection_t *orconn, int flush); void connection_or_report_broken_states(int severity, int domain); @@ -50,8 +56,8 @@ void connection_or_init_conn_from_address(or_connection_t *conn, int started_here); int connection_or_client_learned_peer_id(or_connection_t *conn, const uint8_t *peer_id); -void connection_or_set_circid_type(or_connection_t *conn, - crypto_pk_t *identity_rcvd); +time_t connection_or_client_used(or_connection_t *conn); +int connection_or_get_num_circuits(or_connection_t *conn); void or_handshake_state_free(or_handshake_state_t *state); void or_handshake_state_record_cell(or_handshake_state_t *state, const cell_t *cell, @@ -65,8 +71,6 @@ void connection_or_write_cell_to_buf(const cell_t *cell, or_connection_t *conn); void connection_or_write_var_cell_to_buf(const var_cell_t *cell, or_connection_t *conn); -int connection_or_send_destroy(circid_t circ_id, or_connection_t *conn, - int reason); int connection_or_send_versions(or_connection_t *conn, int v3_plus); int connection_or_send_netinfo(or_connection_t *conn); int connection_or_send_certs_cell(or_connection_t *conn); diff --git a/src/or/include.am b/src/or/include.am index b9032d9..c323575 100644 --- a/src/or/include.am +++ b/src/or/include.am @@ -18,6 +18,7 @@ endif src_or_libtor_a_SOURCES = \ src/or/buffers.c \ src/or/channel.c \ + src/or/channeltls.c \ src/or/circuitbuild.c \ src/or/circuitlist.c \ src/or/circuituse.c \ @@ -88,6 +89,7 @@ src_or_tor_LDADD = src/or/libtor.a src/common/libor.a src/common/libor-crypto.a ORHEADERS = \ src/or/buffers.h \ src/or/channel.h \ + src/or/channeltls.h \ src/or/circuitbuild.h \ src/or/circuitlist.h \ src/or/circuituse.h \ diff --git a/src/or/or.h b/src/or/or.h index a916ac8..2eee6ec 100644 --- a/src/or/or.h +++ b/src/or/or.h @@ -879,6 +879,102 @@ typedef uint16_t circid_t; /** Identifies a stream on a circuit */ typedef uint16_t streamid_t; +/* channel_t typedef; struct channel_s is in channel.h */ + +typedef struct channel_s channel_t; + +/* channel states for channel_t */ + +typedef enum { + /* + * Closed state - channel is inactive + * + * Permitted transitions from: + * - CHANNEL_STATE_CLOSING + * Permitted transitions to: + * - CHANNEL_STATE_LISTENING + * - CHANNEL_STATE_OPENING + */ + CHANNEL_STATE_CLOSED = 0, + /* + * Listening state - channel is listening for incoming connections + * + * Permitted transitions from: + * - CHANNEL_STATE_CLOSED + * Permitted transitions to: + * - CHANNEL_STATE_CLOSING + * - CHANNEL_STATE_ERROR + */ + CHANNEL_STATE_LISTENING, + /* + * Opening state - channel is trying to connect + * + * Permitted transitions from: + * - CHANNEL_STATE_CLOSED + * Permitted transitions to: + * - CHANNEL_STATE_CLOSING + * - CHANNEL_STATE_ERROR + * - CHANNEL_STATE_OPEN + */ + CHANNEL_STATE_OPENING, + /* + * Open state - channel is active and ready for use + * + * Permitted transitions from: + * - CHANNEL_STATE_MAINT + * - CHANNEL_STATE_OPENING + * Permitted transitions to: + * - CHANNEL_STATE_CLOSING + * - CHANNEL_STATE_ERROR + * - CHANNEL_STATE_MAINT + */ + CHANNEL_STATE_OPEN, + /* + * Maintenance state - channel is temporarily offline for subclass specific + * maintenance activities such as TLS renegotiation. + * + * Permitted transitions from: + * - CHANNEL_STATE_OPEN + * Permitted transitions to: + * - CHANNEL_STATE_CLOSING + * - CHANNEL_STATE_ERROR + * - CHANNEL_STATE_OPEN + */ + CHANNEL_STATE_MAINT, + /* + * Closing state - channel is shutting down + * + * Permitted transitions from: + * - CHANNEL_STATE_MAINT + * - CHANNEL_STATE_OPEN + * Permitted transitions to: + * - CHANNEL_STATE_CLOSED, + * - CHANNEL_STATE_ERROR + */ + CHANNEL_STATE_CLOSING, + /* + * Error state - channel has experienced a permanent error + * + * Permitted transitions from: + * - CHANNEL_STATE_CLOSING + * - CHANNEL_STATE_LISTENING + * - CHANNEL_STATE_MAINT + * - CHANNEL_STATE_OPENING + * - CHANNEL_STATE_OPEN + * Permitted transitions to: + * - None + */ + CHANNEL_STATE_ERROR, + /* + * Placeholder for maximum state value + */ + CHANNEL_STATE_LAST +} channel_state_t; + +/* TLS channel stuff */ + +typedef struct channel_tls_s channel_tls_t; + /** Parsed onion routing cell. All communication between nodes * is via cells. */ typedef struct cell_t { @@ -1061,9 +1157,6 @@ typedef struct connection_t { /** Unique identifier for this connection on this Tor instance. */ uint64_t global_identifier; - - /** Unique ID for measuring tunneled network status requests. */ - uint64_t dirreq_id; } connection_t; /** Subtype of connection_t; used for a listener socket. */ @@ -1203,6 +1296,9 @@ typedef struct or_connection_t { /** When we last used this conn for any client traffic. If not * recent, we can rate limit it further. */ + /* Channel using this connection */ + channel_tls_t *chan; + tor_addr_t real_addr; /**< The actual address that this connection came from * or went to. The addr field is prone to * getting overridden by the address from the router @@ -1245,8 +1341,6 @@ typedef struct or_connection_t { /* XXXX we could share this among all connections. */ struct ev_token_bucket_cfg *bucket_cfg; #endif - int n_circuits; /**< How many circuits use this connection as p_conn or - * n_conn ? */ struct or_connection_t *next_with_same_id; /**< Next connection with same * identity digest as this one. */ @@ -1299,6 +1393,10 @@ typedef struct edge_connection_t { * cells. */ unsigned int edge_blocked_on_circ:1; + /** Unique ID for directory requests; this used to be in connection_t, but + * that's going away and being used on channels instead. We still tag + * edge connections with dirreq_id from circuits, so it's copied here. */ + uint64_t dirreq_id; } edge_connection_t; /** Subtype of edge_connection_t for an "entry connection" -- that is, a SOCKS @@ -1421,6 +1519,10 @@ typedef struct dir_connection_t { char identity_digest[DIGEST_LEN]; /**< Hash of the public RSA key for * the directory server's signing key. */ + /** Unique ID for directory requests; this used to be in connection_t, but + * that's going away and being used on channels instead. The dirserver still + * needs this for the incoming side, so it's moved here. */ + uint64_t dirreq_id; } dir_connection_t; /** Subtype of connection_t for an connection to a controller. */ @@ -1520,98 +1622,6 @@ static INLINE listener_connection_t *TO_LISTENER_CONN(connection_t *c) return DOWNCAST(listener_connection_t, c); } -/* channel_t typedef; struct channel_s is in channel.h */ - -typedef struct channel_s channel_t; - -/* channel states for channel_t */ - -typedef enum { - /* - * Closed state - channel is inactive - * - * Permitted transitions from: - * - CHANNEL_STATE_CLOSING - * Permitted transitions to: - * - CHANNEL_STATE_LISTENING - * - CHANNEL_STATE_OPENING - */ - CHANNEL_STATE_CLOSED = 0, - /* - * Listening state - channel is listening for incoming connections - * - * Permitted transitions from: - * - CHANNEL_STATE_CLOSED - * Permitted transitions to: - * - CHANNEL_STATE_CLOSING - * - CHANNEL_STATE_ERROR - */ - CHANNEL_STATE_LISTENING, - /* - * Opening state - channel is trying to connect - * - * Permitted transitions from: - * - CHANNEL_STATE_CLOSED - * Permitted transitions to: - * - CHANNEL_STATE_CLOSING - * - CHANNEL_STATE_ERROR - * - CHANNEL_STATE_OPEN - */ - CHANNEL_STATE_OPENING, - /* - * Open state - channel is active and ready for use - * - * Permitted transitions from: - * - CHANNEL_STATE_MAINT - * - CHANNEL_STATE_OPENING - * Permitted transitions to: - * - CHANNEL_STATE_CLOSING - * - CHANNEL_STATE_ERROR - * - CHANNEL_STATE_MAINT - */ - CHANNEL_STATE_OPEN, - /* - * Maintenance state - channel is temporarily offline for subclass specific - * maintenance activities such as TLS renegotiation. - * - * Permitted transitions from: - * - CHANNEL_STATE_OPEN - * Permitted transitions to: - * - CHANNEL_STATE_CLOSING - * - CHANNEL_STATE_ERROR - * - CHANNEL_STATE_OPEN - */ - CHANNEL_STATE_MAINT, - /* - * Closing state - channel is shutting down - * - * Permitted transitions from: - * - CHANNEL_STATE_MAINT - * - CHANNEL_STATE_OPEN - * Permitted transitions to: - * - CHANNEL_STATE_CLOSED, - * - CHANNEL_STATE_ERROR - */ - CHANNEL_STATE_CLOSING, - /* - * Error state - channel has experienced a permanent error - * - * Permitted transitions from: - * - CHANNEL_STATE_CLOSING - * - CHANNEL_STATE_LISTENING - * - CHANNEL_STATE_MAINT - * - CHANNEL_STATE_OPENING - * - CHANNEL_STATE_OPEN - * Permitted transitions to: - * - None - */ - CHANNEL_STATE_ERROR, - /* - * Placeholder for maximum state value - */ - CHANNEL_STATE_LAST -} channel_state_t; - /* Conditional macros to help write code that works whether bufferevents are disabled or not. @@ -4199,10 +4209,10 @@ typedef enum { /** Flushed last cell from queue of the circuit that initiated a * tunneled request to the outbuf of the OR connection. */ DIRREQ_CIRC_QUEUE_FLUSHED = 3, - /** Flushed last byte from buffer of the OR connection belonging to the + /** Flushed last byte from buffer of the channel belonging to the * circuit that initiated a tunneled request; completes a tunneled * request. */ - DIRREQ_OR_CONN_BUFFER_FLUSHED = 4 + DIRREQ_CHANNEL_BUFFER_FLUSHED = 4 } dirreq_state_t; #define WRITE_STATS_INTERVAL (24*60*60)

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[tor/master] Use channel_t in cmd.c
by andrea＠torproject.org 11 Oct '12

11 Oct '12

commit 519c971f6a3b89f1e81cda3c0290d4d943ec0d78 Author: Andrea Shepard <andrea(a)persephoneslair.org> Date: Thu Aug 23 19:30:49 2012 -0700 Use channel_t in cmd.c --- src/or/command.c | 1046 ++++++------------------------------------------------ src/or/command.h | 8 +- 2 files changed, 107 insertions(+), 947 deletions(-) diff --git a/src/or/command.c b/src/or/command.c index a5ae239..c7a1b1a 100644 --- a/src/or/command.c +++ b/src/or/command.c @@ -12,10 +12,13 @@ /* In-points to command.c: * * - command_process_cell(), called from - * connection_or_process_cells_from_inbuf() in connection_or.c + * incoming cell handlers of channel_t instances; + * callbacks registered in command_setup_channel(), + * called when channels are created in circuitbuild.c */ #include "or.h" +#include "channel.h" #include "circuitbuild.h" #include "circuitlist.h" #include "command.h" @@ -31,8 +34,6 @@ #include "router.h" #include "routerlist.h" -/** How many CELL_PADDING cells have we received, ever? */ -uint64_t stats_n_padding_cells_processed = 0; /** How many CELL_CREATE cells have we received, ever? */ uint64_t stats_n_create_cells_processed = 0; /** How many CELL_CREATED cells have we received, ever? */ @@ -41,38 +42,16 @@ uint64_t stats_n_created_cells_processed = 0; uint64_t stats_n_relay_cells_processed = 0; /** How many CELL_DESTROY cells have we received, ever? */ uint64_t stats_n_destroy_cells_processed = 0; -/** How many CELL_VERSIONS cells have we received, ever? */ -uint64_t stats_n_versions_cells_processed = 0; -/** How many CELL_NETINFO cells have we received, ever? */ -uint64_t stats_n_netinfo_cells_processed = 0; -/** How many CELL_VPADDING cells have we received, ever? */ -uint64_t stats_n_vpadding_cells_processed = 0; -/** How many CELL_CERTS cells have we received, ever? */ -uint64_t stats_n_certs_cells_processed = 0; -/** How many CELL_AUTH_CHALLENGE cells have we received, ever? */ -uint64_t stats_n_auth_challenge_cells_processed = 0; -/** How many CELL_AUTHENTICATE cells have we received, ever? */ -uint64_t stats_n_authenticate_cells_processed = 0; -/** How many CELL_AUTHORIZE cells have we received, ever? */ -uint64_t stats_n_authorize_cells_processed = 0; +/* Handle an incoming channel */ +static void command_handle_incoming_channel(channel_t *listener, + channel_t *chan); /* These are the main functions for processing cells */ -static void command_process_create_cell(cell_t *cell, or_connection_t *conn); -static void command_process_created_cell(cell_t *cell, or_connection_t *conn); -static void command_process_relay_cell(cell_t *cell, or_connection_t *conn); -static void command_process_destroy_cell(cell_t *cell, or_connection_t *conn); -static void command_process_versions_cell(var_cell_t *cell, - or_connection_t *conn); -static void command_process_netinfo_cell(cell_t *cell, or_connection_t *conn); -static void command_process_certs_cell(var_cell_t *cell, - or_connection_t *conn); -static void command_process_auth_challenge_cell(var_cell_t *cell, - or_connection_t *conn); -static void command_process_authenticate_cell(var_cell_t *cell, - or_connection_t *conn); -static int enter_v3_handshake_with_cell(var_cell_t *cell, - or_connection_t *conn); +static void command_process_create_cell(cell_t *cell, channel_t *chan); +static void command_process_created_cell(cell_t *cell, channel_t *chan); +static void command_process_relay_cell(cell_t *cell, channel_t *chan); +static void command_process_destroy_cell(cell_t *cell, channel_t *chan); #ifdef KEEP_TIMING_STATS /** This is a wrapper function around the actual function that processes the @@ -80,15 +59,15 @@ static int enter_v3_handshake_with_cell(var_cell_t *cell, * by the number of microseconds used by the call to *func(cell, conn). */ static void -command_time_process_cell(cell_t *cell, or_connection_t *conn, int *time, - void (*func)(cell_t *, or_connection_t *)) +command_time_process_cell(cell_t *cell, channel_t *chan, int *time, + void (*func)(cell_t *, channel_t *)) { struct timeval start, end; long time_passed; tor_gettimeofday(&start); - (*func)(cell, conn); + (*func)(cell, chan); tor_gettimeofday(&end); time_passed = tv_udiff(&start, &end) ; @@ -104,15 +83,14 @@ command_time_process_cell(cell_t *cell, or_connection_t *conn, int *time, } #endif -/** Process a cell that was just received on conn. Keep internal +/** Process a cell that was just received on chan. Keep internal * statistics about how many of each cell we've processed so far * this second, and the total number of microseconds it took to * process each type of cell. */ void -command_process_cell(cell_t *cell, or_connection_t *conn) +command_process_cell(channel_t *chan, cell_t *cell) { - int handshaking = (conn->_base.state != OR_CONN_STATE_OPEN); #ifdef KEEP_TIMING_STATS /* how many of each cell have we seen so far this second? needs better * name. */ @@ -152,255 +130,114 @@ command_process_cell(cell_t *cell, or_connection_t *conn) #define PROCESS_CELL(tp, cl, cn) command_process_ ## tp ## _cell(cl, cn) #endif - if (conn->_base.marked_for_close) - return; - - /* Reject all but VERSIONS and NETINFO when handshaking. */ - /* (VERSIONS should actually be impossible; it's variable-length.) */ - if (handshaking && cell->command != CELL_VERSIONS && - cell->command != CELL_NETINFO) { - log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL, - "Received unexpected cell command %d in state %s; closing the " - "connection.", - (int)cell->command, - conn_state_to_string(CONN_TYPE_OR,conn->_base.state)); - connection_mark_for_close(TO_CONN(conn)); - return; - } - - if (conn->_base.state == OR_CONN_STATE_OR_HANDSHAKING_V3) - or_handshake_state_record_cell(conn->handshake_state, cell, 1); - switch (cell->command) { - case CELL_PADDING: - ++stats_n_padding_cells_processed; - /* do nothing */ - break; case CELL_CREATE: case CELL_CREATE_FAST: ++stats_n_create_cells_processed; - PROCESS_CELL(create, cell, conn); + PROCESS_CELL(create, cell, chan); break; case CELL_CREATED: case CELL_CREATED_FAST: ++stats_n_created_cells_processed; - PROCESS_CELL(created, cell, conn); + PROCESS_CELL(created, cell, chan); break; case CELL_RELAY: case CELL_RELAY_EARLY: ++stats_n_relay_cells_processed; - PROCESS_CELL(relay, cell, conn); + PROCESS_CELL(relay, cell, chan); break; case CELL_DESTROY: ++stats_n_destroy_cells_processed; - PROCESS_CELL(destroy, cell, conn); - break; - case CELL_VERSIONS: - tor_fragile_assert(); - break; - case CELL_NETINFO: - ++stats_n_netinfo_cells_processed; - PROCESS_CELL(netinfo, cell, conn); + PROCESS_CELL(destroy, cell, chan); break; default: log_fn(LOG_INFO, LD_PROTOCOL, - "Cell of unknown type (%d) received. Dropping.", cell->command); + "Cell of unknown or unexpected type (%d) received. " + "Dropping.", + cell->command); break; } } -/** Return true if command is a cell command that's allowed to start a - * V3 handshake. */ -static int -command_allowed_before_handshake(uint8_t command) -{ - switch (command) { - case CELL_VERSIONS: - case CELL_VPADDING: - case CELL_AUTHORIZE: - return 1; - default: - return 0; - } -} - -/** Process a cell that was just received on conn. Keep internal - * statistics about how many of each cell we've processed so far - * this second, and the total number of microseconds it took to - * process each type of cell. +/** Process an incoming var_cell from a channel; in the current protocol all + * the var_cells are handshake-related and handles below the channel layer, + * so this just logs a warning and drops the cell. */ + void -command_process_var_cell(var_cell_t *cell, or_connection_t *conn) +command_process_var_cell(channel_t *chan, var_cell_t *var_cell) { -#ifdef KEEP_TIMING_STATS - /* how many of each cell have we seen so far this second? needs better - * name. */ - static int num_versions=0, num_certs=0; - - time_t now = time(NULL); - - if (now > current_second) { /* the second has rolled over */ - /* print stats */ - log_info(LD_OR, - "At end of second: %d versions (%d ms), %d certs (%d ms)", - num_versions, versions_time/1000, - num_certs, certs_time/1000); - - num_versions = num_certs = 0; - versions_time = certs_time = 0; + tor_assert(chan); + tor_assert(var_cell); - /* remember which second it is, for next time */ - current_second = now; - } -#endif - - if (conn->_base.marked_for_close) - return; - - switch (conn->_base.state) - { - case OR_CONN_STATE_OR_HANDSHAKING_V2: - if (cell->command != CELL_VERSIONS) { - log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL, - "Received a cell with command %d in state %s; " - "closing the connection.", - (int)cell->command, - conn_state_to_string(CONN_TYPE_OR,conn->_base.state)); - connection_mark_for_close(TO_CONN(conn)); - return; - } - break; - case OR_CONN_STATE_TLS_HANDSHAKING: - /* If we're using bufferevents, it's entirely possible for us to - * notice "hey, data arrived!" before we notice "hey, the handshake - * finished!" And we need to be accepting both at once to handle both - * the v2 and v3 handshakes. */ - - /* fall through */ - case OR_CONN_STATE_TLS_SERVER_RENEGOTIATING: - if (! command_allowed_before_handshake(cell->command)) { - log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL, - "Received a cell with command %d in state %s; " - "closing the connection.", - (int)cell->command, - conn_state_to_string(CONN_TYPE_OR,conn->_base.state)); - connection_mark_for_close(TO_CONN(conn)); - return; - } else { - if (enter_v3_handshake_with_cell(cell, conn)<0) - return; - } - break; - case OR_CONN_STATE_OR_HANDSHAKING_V3: - if (cell->command != CELL_AUTHENTICATE) - or_handshake_state_record_var_cell(conn->handshake_state, cell, 1); - break; /* Everything is allowed */ - case OR_CONN_STATE_OPEN: - if (conn->link_proto < 3) { - log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL, - "Received a variable-length cell with command %d in state %s " - "with link protocol %d; ignoring it.", - (int)cell->command, - conn_state_to_string(CONN_TYPE_OR,conn->_base.state), - (int)conn->link_proto); - return; - } - break; - default: - log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL, - "Received var-length cell with command %d in unexpected state " - "%s [%d]; ignoring it.", - (int)cell->command, - conn_state_to_string(CONN_TYPE_OR,conn->_base.state), - (int)conn->_base.state); - return; - } - - switch (cell->command) { - case CELL_VERSIONS: - ++stats_n_versions_cells_processed; - PROCESS_CELL(versions, cell, conn); - break; - case CELL_VPADDING: - ++stats_n_vpadding_cells_processed; - /* Do nothing */ - break; - case CELL_CERTS: - ++stats_n_certs_cells_processed; - PROCESS_CELL(certs, cell, conn); - break; - case CELL_AUTH_CHALLENGE: - ++stats_n_auth_challenge_cells_processed; - PROCESS_CELL(auth_challenge, cell, conn); - break; - case CELL_AUTHENTICATE: - ++stats_n_authenticate_cells_processed; - PROCESS_CELL(authenticate, cell, conn); - break; - case CELL_AUTHORIZE: - ++stats_n_authorize_cells_processed; - /* Ignored so far. */ - break; - default: - log_fn(LOG_INFO, LD_PROTOCOL, - "Variable-length cell of unknown type (%d) received.", - cell->command); - break; - } + log_info(LD_PROTOCOL, + "Received unexpected var_cell above the channel layer of type %d" + "; dropping it.", + var_cell->command); } -/** Process a 'create' cell that just arrived from conn. Make a +/** Process a 'create' cell that just arrived from chan. Make a * new circuit with the p_circ_id specified in cell. Put the circuit in state * onionskin_pending, and pass the onionskin to the cpuworker. Circ will get * picked up again when the cpuworker finishes decrypting it. */ static void -command_process_create_cell(cell_t *cell, or_connection_t *conn) +command_process_create_cell(cell_t *cell, channel_t *chan) { or_circuit_t *circ; const or_options_t *options = get_options(); int id_is_high; + tor_assert(cell); + tor_assert(chan); + tor_assert(!(chan->is_listener)); + + log_debug(LD_OR, + "Got a CREATE cell for circ_id %d on channel %lu (%p)", + cell->circ_id, chan->global_identifier, chan); + if (we_are_hibernating()) { log_info(LD_OR, "Received create cell but we're shutting down. Sending back " "destroy."); - connection_or_send_destroy(cell->circ_id, conn, + channel_send_destroy(cell->circ_id, chan, END_CIRC_REASON_HIBERNATING); return; } if (!server_mode(options) || - (!public_server_mode(options) && conn->is_outgoing)) { + (!public_server_mode(options) && channel_is_outgoing(chan))) { log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL, - "Received create cell (type %d) from %s:%d, but we're connected " + "Received create cell (type %d) from %s, but we're connected " "to it as a client. " "Sending back a destroy.", - (int)cell->command, conn->_base.address, conn->_base.port); - connection_or_send_destroy(cell->circ_id, conn, - END_CIRC_REASON_TORPROTOCOL); + (int)cell->command, channel_get_canonical_remote_descr(chan)); + channel_send_destroy(cell->circ_id, chan, + END_CIRC_REASON_TORPROTOCOL); return; } /* If the high bit of the circuit ID is not as expected, close the * circ. */ id_is_high = cell->circ_id & (1<<15); - if ((id_is_high && conn->circ_id_type == CIRC_ID_TYPE_HIGHER) || - (!id_is_high && conn->circ_id_type == CIRC_ID_TYPE_LOWER)) { + if ((id_is_high && + chan->u.cell_chan.circ_id_type == CIRC_ID_TYPE_HIGHER) || + (!id_is_high && + chan->u.cell_chan.circ_id_type == CIRC_ID_TYPE_LOWER)) { log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL, "Received create cell with unexpected circ_id %d. Closing.", cell->circ_id); - connection_or_send_destroy(cell->circ_id, conn, - END_CIRC_REASON_TORPROTOCOL); + channel_send_destroy(cell->circ_id, chan, + END_CIRC_REASON_TORPROTOCOL); return; } - if (circuit_id_in_use_on_orconn(cell->circ_id, conn)) { - const node_t *node = node_get_by_id(conn->identity_digest); + if (circuit_id_in_use_on_channel(cell->circ_id, chan)) { + const node_t *node = node_get_by_id(chan->u.cell_chan.identity_digest); log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL, "Received CREATE cell (circID %d) for known circ. " "Dropping (age %d).", - cell->circ_id, (int)(time(NULL) - conn->_base.timestamp_created)); + cell->circ_id, (int)(time(NULL) - channel_when_created(chan))); if (node) { char *p = esc_for_log(node_get_platform(node)); log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL, @@ -411,7 +248,7 @@ command_process_create_cell(cell_t *cell, or_connection_t *conn) return; } - circ = or_circuit_new(cell->circ_id, conn); + circ = or_circuit_new(cell->circ_id, chan); circ->_base.purpose = CIRCUIT_PURPOSE_OR; circuit_set_state(TO_CIRCUIT(circ), CIRCUIT_STATE_ONIONSKIN_PENDING); if (cell->command == CELL_CREATE) { @@ -442,7 +279,7 @@ command_process_create_cell(cell_t *cell, or_connection_t *conn) /* Make sure we never try to use the OR connection on which we * received this cell to satisfy an EXTEND request, */ - conn->is_connection_with_client = 1; + channel_mark_client(chan); if (fast_server_handshake(cell->payload, (uint8_t*)reply, (uint8_t*)keys, sizeof(keys))<0) { @@ -458,7 +295,7 @@ command_process_create_cell(cell_t *cell, or_connection_t *conn) } } -/** Process a 'created' cell that just arrived from conn. +/** Process a 'created' cell that just arrived from chan. * Find the circuit * that it's intended for. If we're not the origin of the circuit, package * the 'created' cell in an 'extended' relay cell and pass it back. If we @@ -467,11 +304,11 @@ command_process_create_cell(cell_t *cell, or_connection_t *conn) * extend to the next hop in the circuit if necessary. */ static void -command_process_created_cell(cell_t *cell, or_connection_t *conn) +command_process_created_cell(cell_t *cell, channel_t *chan) { circuit_t *circ; - circ = circuit_get_by_circid_orconn(cell->circ_id, conn); + circ = circuit_get_by_circid_channel(cell->circ_id, chan); if (!circ) { log_info(LD_OR, @@ -518,17 +355,17 @@ command_process_created_cell(cell_t *cell, or_connection_t *conn) * circuit_receive_relay_cell() for actual processing. */ static void -command_process_relay_cell(cell_t *cell, or_connection_t *conn) +command_process_relay_cell(cell_t *cell, channel_t *chan) { circuit_t *circ; int reason, direction; - circ = circuit_get_by_circid_orconn(cell->circ_id, conn); + circ = circuit_get_by_circid_channel(cell->circ_id, chan); if (!circ) { log_debug(LD_OR, - "unknown circuit %d on connection from %s:%d. Dropping.", - cell->circ_id, conn->_base.address, conn->_base.port); + "unknown circuit %d on connection from %s. Dropping.", + cell->circ_id, channel_get_canonical_remote_descr(chan)); return; } @@ -541,7 +378,7 @@ command_process_relay_cell(cell_t *cell, or_connection_t *conn) if (CIRCUIT_IS_ORIGIN(circ)) { /* if we're a relay and treating connections with recent local * traffic better, then this is one of them. */ - conn->client_used = time(NULL); + channel_timestamp_client(chan); } if (!CIRCUIT_IS_ORIGIN(circ) && @@ -562,10 +399,10 @@ command_process_relay_cell(cell_t *cell, or_connection_t *conn) or_circuit_t *or_circ = TO_OR_CIRCUIT(circ); if (or_circ->remaining_relay_early_cells == 0) { log_fn(LOG_PROTOCOL_WARN, LD_OR, - "Received too many RELAY_EARLY cells on circ %d from %s:%d." + "Received too many RELAY_EARLY cells on circ %d from %s." " Closing circuit.", - cell->circ_id, safe_str(conn->_base.address), - conn->_base.port); + cell->circ_id, + safe_str(channel_get_canonical_remote_descr(chan))); circuit_mark_for_close(circ, END_CIRC_REASON_TORPROTOCOL); return; } @@ -582,7 +419,7 @@ command_process_relay_cell(cell_t *cell, or_connection_t *conn) } /** Process a 'destroy' cell that just arrived from - * conn. Find the circ that it refers to (if any). + * chan. Find the circ that it refers to (if any). * * If the circ is in state * onionskin_pending, then call onion_pending_remove() to remove it @@ -595,15 +432,15 @@ command_process_relay_cell(cell_t *cell, or_connection_t *conn) * and passes the destroy cell onward if necessary). */ static void -command_process_destroy_cell(cell_t *cell, or_connection_t *conn) +command_process_destroy_cell(cell_t *cell, channel_t *chan) { circuit_t *circ; int reason; - circ = circuit_get_by_circid_orconn(cell->circ_id, conn); + circ = circuit_get_by_circid_channel(cell->circ_id, chan); if (!circ) { - log_info(LD_OR,"unknown circuit %d on connection from %s:%d. Dropping.", - cell->circ_id, conn->_base.address, conn->_base.port); + log_info(LD_OR,"unknown circuit %d on connection from %s. Dropping.", + cell->circ_id, channel_get_canonical_remote_descr(chan)); return; } log_debug(LD_OR,"Received for circID %d.",cell->circ_id); @@ -613,10 +450,10 @@ command_process_destroy_cell(cell_t *cell, or_connection_t *conn) if (!CIRCUIT_IS_ORIGIN(circ) && cell->circ_id == TO_OR_CIRCUIT(circ)->p_circ_id) { /* the destroy came from behind */ - circuit_set_p_circid_orconn(TO_OR_CIRCUIT(circ), 0, NULL); + circuit_set_p_circid_chan(TO_OR_CIRCUIT(circ), 0, NULL); circuit_mark_for_close(circ, reason|END_CIRC_REASON_FLAG_REMOTE); } else { /* the destroy came from ahead */ - circuit_set_n_circid_orconn(circ, 0, NULL); + circuit_set_n_circid_chan(circ, 0, NULL); if (CIRCUIT_IS_ORIGIN(circ)) { circuit_mark_for_close(circ, reason|END_CIRC_REASON_FLAG_REMOTE); } else { @@ -629,724 +466,43 @@ command_process_destroy_cell(cell_t *cell, or_connection_t *conn) } } -/** Called when we as a server receive an appropriate cell while waiting - * either for a cell or a TLS handshake. Set the connection's state to - * "handshaking_v3', initializes the or_handshake_state field as needed, - * and add the cell to the hash of incoming cells.) - * - * Return 0 on success; return -1 and mark the connection on failure. +/** Callback to handle a new channel; call command_setup_channel() to give + * it the right cell handlers. */ -static int -enter_v3_handshake_with_cell(var_cell_t *cell, or_connection_t *conn) -{ - const int started_here = connection_or_nonopen_was_started_here(conn); - tor_assert(conn->_base.state == OR_CONN_STATE_TLS_HANDSHAKING || - conn->_base.state == OR_CONN_STATE_TLS_SERVER_RENEGOTIATING); - - if (started_here) { - log_fn(LOG_PROTOCOL_WARN, LD_OR, - "Received a cell while TLS-handshaking, not in " - "OR_HANDSHAKING_V3, on a connection we originated."); - } - conn->_base.state = OR_CONN_STATE_OR_HANDSHAKING_V3; - if (connection_init_or_handshake_state(conn, started_here) < 0) { - connection_mark_for_close(TO_CONN(conn)); - return -1; - } - or_handshake_state_record_var_cell(conn->handshake_state, cell, 1); - return 0; -} - -/** Process a 'versions' cell. The current link protocol version must be 0 - * to indicate that no version has yet been negotiated. We compare the - * versions in the cell to the list of versions we support, pick the - * highest version we have in common, and continue the negotiation from - * there. - */ static void -command_process_versions_cell(var_cell_t *cell, or_connection_t *conn) +command_handle_incoming_channel(channel_t *listener, channel_t *chan) { - int highest_supported_version = 0; - const uint8_t *cp, *end; - const int started_here = connection_or_nonopen_was_started_here(conn); - if (conn->link_proto != 0 || - (conn->handshake_state && conn->handshake_state->received_versions)) { - log_fn(LOG_PROTOCOL_WARN, LD_OR, - "Received a VERSIONS cell on a connection with its version " - "already set to %d; dropping", (int) conn->link_proto); - return; - } - switch (conn->_base.state) - { - case OR_CONN_STATE_OR_HANDSHAKING_V2: - case OR_CONN_STATE_OR_HANDSHAKING_V3: - break; - case OR_CONN_STATE_TLS_HANDSHAKING: - case OR_CONN_STATE_TLS_SERVER_RENEGOTIATING: - default: - log_fn(LOG_PROTOCOL_WARN, LD_OR, - "VERSIONS cell while in unexpected state"); - return; - } - - tor_assert(conn->handshake_state); - end = cell->payload + cell->payload_len; - for (cp = cell->payload; cp+1 < end; ++cp) { - uint16_t v = ntohs(get_uint16(cp)); - if (is_or_protocol_version_known(v) && v > highest_supported_version) - highest_supported_version = v; - } - if (!highest_supported_version) { - log_fn(LOG_PROTOCOL_WARN, LD_OR, - "Couldn't find a version in common between my version list and the " - "list in the VERSIONS cell; closing connection."); - connection_mark_for_close(TO_CONN(conn)); - return; - } else if (highest_supported_version == 1) { - /* Negotiating version 1 makes no sense, since version 1 has no VERSIONS - * cells. */ - log_fn(LOG_PROTOCOL_WARN, LD_OR, - "Used version negotiation protocol to negotiate a v1 connection. " - "That's crazily non-compliant. Closing connection."); - connection_mark_for_close(TO_CONN(conn)); - return; - } else if (highest_supported_version < 3 && - conn->_base.state == OR_CONN_STATE_OR_HANDSHAKING_V3) { - log_fn(LOG_PROTOCOL_WARN, LD_OR, - "Negotiated link protocol 2 or lower after doing a v3 TLS " - "handshake. Closing connection."); - connection_mark_for_close(TO_CONN(conn)); - return; - } - - conn->link_proto = highest_supported_version; - conn->handshake_state->received_versions = 1; - - if (conn->link_proto == 2) { - log_info(LD_OR, "Negotiated version %d with %s:%d; sending NETINFO.", - highest_supported_version, - safe_str_client(conn->_base.address), - conn->_base.port); - - if (connection_or_send_netinfo(conn) < 0) { - connection_mark_for_close(TO_CONN(conn)); - return; - } - } else { - const int send_versions = !started_here; - /* If we want to authenticate, send a CERTS cell */ - const int send_certs = !started_here || public_server_mode(get_options()); - /* If we're a relay that got a connection, ask for authentication. */ - const int send_chall = !started_here && public_server_mode(get_options()); - /* If our certs cell will authenticate us, we can send a netinfo cell - * right now. */ - const int send_netinfo = !started_here; - const int send_any = - send_versions || send_certs || send_chall || send_netinfo; - tor_assert(conn->link_proto >= 3); - - log_info(LD_OR, "Negotiated version %d with %s:%d; %s%s%s%s%s", - highest_supported_version, - safe_str_client(conn->_base.address), - conn->_base.port, - send_any ? "Sending cells:" : "Waiting for CERTS cell", - send_versions ? " VERSIONS" : "", - send_certs ? " CERTS" : "", - send_chall ? " AUTH_CHALLENGE" : "", - send_netinfo ? " NETINFO" : ""); - -#ifdef DISABLE_V3_LINKPROTO_SERVERSIDE - if (1) { - connection_mark_for_close(TO_CONN(conn)); - return; - } -#endif - - if (send_versions) { - if (connection_or_send_versions(conn, 1) < 0) { - log_warn(LD_OR, "Couldn't send versions cell"); - connection_mark_for_close(TO_CONN(conn)); - return; - } - } - if (send_certs) { - if (connection_or_send_certs_cell(conn) < 0) { - log_warn(LD_OR, "Couldn't send certs cell"); - connection_mark_for_close(TO_CONN(conn)); - return; - } - } - if (send_chall) { - if (connection_or_send_auth_challenge_cell(conn) < 0) { - log_warn(LD_OR, "Couldn't send auth_challenge cell"); - connection_mark_for_close(TO_CONN(conn)); - return; - } - } - if (send_netinfo) { - if (connection_or_send_netinfo(conn) < 0) { - log_warn(LD_OR, "Couldn't send netinfo cell"); - connection_mark_for_close(TO_CONN(conn)); - return; - } - } - } -} - -/** Process a 'netinfo' cell: read and act on its contents, and set the - * connection state to "open". */ -static void -command_process_netinfo_cell(cell_t *cell, or_connection_t *conn) -{ - time_t timestamp; - uint8_t my_addr_type; - uint8_t my_addr_len; - const uint8_t *my_addr_ptr; - const uint8_t *cp, *end; - uint8_t n_other_addrs; - time_t now = time(NULL); - - long apparent_skew = 0; - tor_addr_t my_apparent_addr = TOR_ADDR_NULL; + tor_assert(listener); + tor_assert(chan); - if (conn->link_proto < 2) { - log_fn(LOG_PROTOCOL_WARN, LD_OR, - "Received a NETINFO cell on %s connection; dropping.", - conn->link_proto == 0 ? "non-versioned" : "a v1"); - return; - } - if (conn->_base.state != OR_CONN_STATE_OR_HANDSHAKING_V2 && - conn->_base.state != OR_CONN_STATE_OR_HANDSHAKING_V3) { - log_fn(LOG_PROTOCOL_WARN, LD_OR, - "Received a NETINFO cell on non-handshaking connection; dropping."); - return; - } - tor_assert(conn->handshake_state && - conn->handshake_state->received_versions); - - if (conn->_base.state == OR_CONN_STATE_OR_HANDSHAKING_V3) { - tor_assert(conn->link_proto >= 3); - if (conn->handshake_state->started_here) { - if (!conn->handshake_state->authenticated) { - log_fn(LOG_PROTOCOL_WARN, LD_OR, "Got a NETINFO cell from server, " - "but no authentication. Closing the connection."); - connection_mark_for_close(TO_CONN(conn)); - return; - } - } else { - /* we're the server. If the client never authenticated, we have - some housekeeping to do.*/ - if (!conn->handshake_state->authenticated) { - tor_assert(tor_digest_is_zero( - (const char*)conn->handshake_state->authenticated_peer_id)); - connection_or_set_circid_type(conn, NULL); - - connection_or_init_conn_from_address(conn, - &conn->_base.addr, - conn->_base.port, - (const char*)conn->handshake_state->authenticated_peer_id, - 0); - } - } - } - - /* Decode the cell. */ - timestamp = ntohl(get_uint32(cell->payload)); - if (labs(now - conn->handshake_state->sent_versions_at) < 180) { - apparent_skew = now - timestamp; - } - - my_addr_type = (uint8_t) cell->payload[4]; - my_addr_len = (uint8_t) cell->payload[5]; - my_addr_ptr = (uint8_t*) cell->payload + 6; - end = cell->payload + CELL_PAYLOAD_SIZE; - cp = cell->payload + 6 + my_addr_len; - if (cp >= end) { - log_fn(LOG_PROTOCOL_WARN, LD_OR, - "Addresses too long in netinfo cell; closing connection."); - connection_mark_for_close(TO_CONN(conn)); - return; - } else if (my_addr_type == RESOLVED_TYPE_IPV4 && my_addr_len == 4) { - tor_addr_from_ipv4n(&my_apparent_addr, get_uint32(my_addr_ptr)); - } else if (my_addr_type == RESOLVED_TYPE_IPV6 && my_addr_len == 16) { - tor_addr_from_ipv6_bytes(&my_apparent_addr, (const char *) my_addr_ptr); - } - - n_other_addrs = (uint8_t) *cp++; - while (n_other_addrs && cp < end-2) { - /* Consider all the other addresses; if any matches, this connection is - * "canonical." */ - tor_addr_t addr; - const uint8_t *next = - decode_address_from_payload(&addr, cp, (int)(end-cp)); - if (next == NULL) { - log_fn(LOG_PROTOCOL_WARN, LD_OR, - "Bad address in netinfo cell; closing connection."); - connection_mark_for_close(TO_CONN(conn)); - return; - } - if (tor_addr_eq(&addr, &conn->real_addr)) { - conn->is_canonical = 1; - break; - } - cp = next; - --n_other_addrs; - } - - /* Act on apparent skew. */ - /** Warn when we get a netinfo skew with at least this value. */ -#define NETINFO_NOTICE_SKEW 3600 - if (labs(apparent_skew) > NETINFO_NOTICE_SKEW && - router_get_by_id_digest(conn->identity_digest)) { - char dbuf[64]; - int severity; - /*XXXX be smarter about when everybody says we are skewed. */ - if (router_digest_is_trusted_dir(conn->identity_digest)) - severity = LOG_WARN; - else - severity = LOG_INFO; - format_time_interval(dbuf, sizeof(dbuf), apparent_skew); - log_fn(severity, LD_GENERAL, "Received NETINFO cell with skewed time from " - "server at %s:%d. It seems that our clock is %s by %s, or " - "that theirs is %s. Tor requires an accurate clock to work: " - "please check your time and date settings.", - conn->_base.address, (int)conn->_base.port, - apparent_skew>0 ? "ahead" : "behind", dbuf, - apparent_skew>0 ? "behind" : "ahead"); - if (severity == LOG_WARN) /* only tell the controller if an authority */ - control_event_general_status(LOG_WARN, - "CLOCK_SKEW SKEW=%ld SOURCE=OR:%s:%d", - apparent_skew, - conn->_base.address, conn->_base.port); - } - - /* XXX maybe act on my_apparent_addr, if the source is sufficiently - * trustworthy. */ - - if (connection_or_set_state_open(conn)<0) { - log_fn(LOG_PROTOCOL_WARN, LD_OR, "Got good NETINFO cell from %s:%d; but " - "was unable to make the OR connection become open.", - safe_str_client(conn->_base.address), - conn->_base.port); - connection_mark_for_close(TO_CONN(conn)); - } else { - log_info(LD_OR, "Got good NETINFO cell from %s:%d; OR connection is now " - "open, using protocol version %d. Its ID digest is %s. " - "Our address is apparently %s.", - safe_str_client(conn->_base.address), - conn->_base.port, (int)conn->link_proto, - hex_str(conn->identity_digest, DIGEST_LEN), - tor_addr_is_null(&my_apparent_addr) ? - "<none>" : fmt_and_decorate_addr(&my_apparent_addr)); - } - assert_connection_ok(TO_CONN(conn),time(NULL)); + command_setup_channel(chan); } -/** Process a CERTS cell from an OR connection. - * - * If the other side should not have sent us a CERTS cell, or the cell is - * malformed, or it is supposed to authenticate the TLS key but it doesn't, - * then mark the connection. - * - * If the cell has a good cert chain and we're doing a v3 handshake, then - * store the certificates in or_handshake_state. If this is the client side - * of the connection, we then authenticate the server or mark the connection. - * If it's the server side, wait for an AUTHENTICATE cell. +/** Given a channel, install the right handlers to process incoming + * cells on it. */ -static void -command_process_certs_cell(var_cell_t *cell, or_connection_t *conn) -{ -#define ERR(s) \ - do { \ - log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL, \ - "Received a bad CERTS cell from %s:%d: %s", \ - safe_str(conn->_base.address), conn->_base.port, (s)); \ - connection_mark_for_close(TO_CONN(conn)); \ - goto err; \ - } while (0) - - tor_cert_t *link_cert = NULL; - tor_cert_t *id_cert = NULL; - tor_cert_t *auth_cert = NULL; - - uint8_t *ptr; - int n_certs, i; - int send_netinfo = 0; - - if (conn->_base.state != OR_CONN_STATE_OR_HANDSHAKING_V3) - ERR("We're not doing a v3 handshake!"); - if (conn->link_proto < 3) - ERR("We're not using link protocol >= 3"); - if (conn->handshake_state->received_certs_cell) - ERR("We already got one"); - if (conn->handshake_state->authenticated) { - /* Should be unreachable, but let's make sure. */ - ERR("We're already authenticated!"); - } - if (cell->payload_len < 1) - ERR("It had no body"); - if (cell->circ_id) - ERR("It had a nonzero circuit ID"); - - n_certs = cell->payload[0]; - ptr = cell->payload + 1; - for (i = 0; i < n_certs; ++i) { - uint8_t cert_type; - uint16_t cert_len; - if (ptr + 3 > cell->payload + cell->payload_len) { - goto truncated; - } - cert_type = *ptr; - cert_len = ntohs(get_uint16(ptr+1)); - if (ptr + 3 + cert_len > cell->payload + cell->payload_len) { - goto truncated; - } - if (cert_type == OR_CERT_TYPE_TLS_LINK || - cert_type == OR_CERT_TYPE_ID_1024 || - cert_type == OR_CERT_TYPE_AUTH_1024) { - tor_cert_t *cert = tor_cert_decode(ptr + 3, cert_len); - if (!cert) { - log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL, - "Received undecodable certificate in CERTS cell from %s:%d", - safe_str(conn->_base.address), conn->_base.port); - } else { - if (cert_type == OR_CERT_TYPE_TLS_LINK) { - if (link_cert) { - tor_cert_free(cert); - ERR("Too many TLS_LINK certificates"); - } - link_cert = cert; - } else if (cert_type == OR_CERT_TYPE_ID_1024) { - if (id_cert) { - tor_cert_free(cert); - ERR("Too many ID_1024 certificates"); - } - id_cert = cert; - } else if (cert_type == OR_CERT_TYPE_AUTH_1024) { - if (auth_cert) { - tor_cert_free(cert); - ERR("Too many AUTH_1024 certificates"); - } - auth_cert = cert; - } else { - tor_cert_free(cert); - } - } - } - ptr += 3 + cert_len; - continue; - - truncated: - ERR("It ends in the middle of a certificate"); - } - - if (conn->handshake_state->started_here) { - int severity; - if (! (id_cert && link_cert)) - ERR("The certs we wanted were missing"); - /* Okay. We should be able to check the certificates now. */ - if (! tor_tls_cert_matches_key(conn->tls, link_cert)) { - ERR("The link certificate didn't match the TLS public key"); - } - /* Note that this warns more loudly about time and validity if we were - * _trying_ to connect to an authority, not necessarily if we _did_ connect - * to one. */ - if (router_digest_is_trusted_dir(conn->identity_digest)) - severity = LOG_WARN; - else - severity = LOG_PROTOCOL_WARN; - - if (! tor_tls_cert_is_valid(severity, link_cert, id_cert, 0)) - ERR("The link certificate was not valid"); - if (! tor_tls_cert_is_valid(severity, id_cert, id_cert, 1)) - ERR("The ID certificate was not valid"); - - conn->handshake_state->authenticated = 1; - { - const digests_t *id_digests = tor_cert_get_id_digests(id_cert); - crypto_pk_t *identity_rcvd; - if (!id_digests) - ERR("Couldn't compute digests for key in ID cert"); - - identity_rcvd = tor_tls_cert_get_key(id_cert); - if (!identity_rcvd) - ERR("Internal error: Couldn't get RSA key from ID cert."); - memcpy(conn->handshake_state->authenticated_peer_id, - id_digests->d[DIGEST_SHA1], DIGEST_LEN); - connection_or_set_circid_type(conn, identity_rcvd); - crypto_pk_free(identity_rcvd); - } - - if (connection_or_client_learned_peer_id(conn, - conn->handshake_state->authenticated_peer_id) < 0) - ERR("Problem setting or checking peer id"); - - log_info(LD_OR, "Got some good certificates from %s:%d: Authenticated it.", - safe_str(conn->_base.address), conn->_base.port); - - conn->handshake_state->id_cert = id_cert; - id_cert = NULL; - - if (!public_server_mode(get_options())) { - /* If we initiated the connection and we are not a public server, we - * aren't planning to authenticate at all. At this point we know who we - * are talking to, so we can just send a netinfo now. */ - send_netinfo = 1; - } - } else { - if (! (id_cert && auth_cert)) - ERR("The certs we wanted were missing"); - - /* Remember these certificates so we can check an AUTHENTICATE cell */ - if (! tor_tls_cert_is_valid(LOG_PROTOCOL_WARN, auth_cert, id_cert, 1)) - ERR("The authentication certificate was not valid"); - if (! tor_tls_cert_is_valid(LOG_PROTOCOL_WARN, id_cert, id_cert, 1)) - ERR("The ID certificate was not valid"); - - log_info(LD_OR, "Got some good certificates from %s:%d: " - "Waiting for AUTHENTICATE.", - safe_str(conn->_base.address), conn->_base.port); - /* XXXX check more stuff? */ - conn->handshake_state->id_cert = id_cert; - conn->handshake_state->auth_cert = auth_cert; - id_cert = auth_cert = NULL; - } - - conn->handshake_state->received_certs_cell = 1; - - if (send_netinfo) { - if (connection_or_send_netinfo(conn) < 0) { - log_warn(LD_OR, "Couldn't send netinfo cell"); - connection_mark_for_close(TO_CONN(conn)); - goto err; - } - } - - err: - tor_cert_free(id_cert); - tor_cert_free(link_cert); - tor_cert_free(auth_cert); -#undef ERR -} - -/** Process an AUTH_CHALLENGE cell from an OR connection. - * - * If we weren't supposed to get one (for example, because we're not the - * originator of the connection), or it's ill-formed, or we aren't doing a v3 - * handshake, mark the connection. If the cell is well-formed but we don't - * want to authenticate, just drop it. If the cell is well-formed *and* we - * want to authenticate, send an AUTHENTICATE cell and then a NETINFO cell. */ -static void -command_process_auth_challenge_cell(var_cell_t *cell, or_connection_t *conn) +void +command_setup_channel(channel_t *chan) { - int n_types, i, use_type = -1; - uint8_t *cp; - -#define ERR(s) \ - do { \ - log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL, \ - "Received a bad AUTH_CHALLENGE cell from %s:%d: %s", \ - safe_str(conn->_base.address), conn->_base.port, (s)); \ - connection_mark_for_close(TO_CONN(conn)); \ - return; \ - } while (0) - - if (conn->_base.state != OR_CONN_STATE_OR_HANDSHAKING_V3) - ERR("We're not currently doing a v3 handshake"); - if (conn->link_proto < 3) - ERR("We're not using link protocol >= 3"); - if (! conn->handshake_state->started_here) - ERR("We didn't originate this connection"); - if (conn->handshake_state->received_auth_challenge) - ERR("We already received one"); - if (! conn->handshake_state->received_certs_cell) - ERR("We haven't gotten a CERTS cell yet"); - if (cell->payload_len < OR_AUTH_CHALLENGE_LEN + 2) - ERR("It was too short"); - if (cell->circ_id) - ERR("It had a nonzero circuit ID"); - - n_types = ntohs(get_uint16(cell->payload + OR_AUTH_CHALLENGE_LEN)); - if (cell->payload_len < OR_AUTH_CHALLENGE_LEN + 2 + 2*n_types) - ERR("It looks truncated"); - - /* Now see if there is an authentication type we can use */ - cp=cell->payload+OR_AUTH_CHALLENGE_LEN+2; - for (i=0; i < n_types; ++i, cp += 2) { - uint16_t authtype = ntohs(get_uint16(cp)); - if (authtype == AUTHTYPE_RSA_SHA256_TLSSECRET) - use_type = authtype; - } - - conn->handshake_state->received_auth_challenge = 1; - - if (! public_server_mode(get_options())) { - /* If we're not a public server then we don't want to authenticate on a - connection we originated, and we already sent a NETINFO cell when we - got the CERTS cell. We have nothing more to do. */ - return; - } - - if (use_type >= 0) { - log_info(LD_OR, "Got an AUTH_CHALLENGE cell from %s:%d: Sending " - "authentication", - safe_str(conn->_base.address), conn->_base.port); - - if (connection_or_send_authenticate_cell(conn, use_type) < 0) { - log_warn(LD_OR, "Couldn't send authenticate cell"); - connection_mark_for_close(TO_CONN(conn)); - return; - } - } else { - log_info(LD_OR, "Got an AUTH_CHALLENGE cell from %s:%d, but we don't " - "know any of its authentication types. Not authenticating.", - safe_str(conn->_base.address), conn->_base.port); - } - - if (connection_or_send_netinfo(conn) < 0) { - log_warn(LD_OR, "Couldn't send netinfo cell"); - connection_mark_for_close(TO_CONN(conn)); - return; - } + tor_assert(chan); -#undef ERR + channel_set_cell_handlers(chan, + command_process_cell, + command_process_var_cell); } -/** Process an AUTHENTICATE cell from an OR connection. - * - * If it's ill-formed or we weren't supposed to get one or we're not doing a - * v3 handshake, then mark the connection. If it does not authenticate the - * other side of the connection successfully (because it isn't signed right, - * we didn't get a CERTS cell, etc) mark the connection. Otherwise, accept - * the identity of the router on the other side of the connection. +/** Given a listener, install the right handler to process incoming + * channels on it. */ -static void -command_process_authenticate_cell(var_cell_t *cell, or_connection_t *conn) -{ - uint8_t expected[V3_AUTH_FIXED_PART_LEN]; - const uint8_t *auth; - int authlen; - -#define ERR(s) \ - do { \ - log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL, \ - "Received a bad AUTHENTICATE cell from %s:%d: %s", \ - safe_str(conn->_base.address), conn->_base.port, (s)); \ - connection_mark_for_close(TO_CONN(conn)); \ - return; \ - } while (0) - - if (conn->_base.state != OR_CONN_STATE_OR_HANDSHAKING_V3) - ERR("We're not doing a v3 handshake"); - if (conn->link_proto < 3) - ERR("We're not using link protocol >= 3"); - if (conn->handshake_state->started_here) - ERR("We originated this connection"); - if (conn->handshake_state->received_authenticate) - ERR("We already got one!"); - if (conn->handshake_state->authenticated) { - /* Should be impossible given other checks */ - ERR("The peer is already authenticated"); - } - if (! conn->handshake_state->received_certs_cell) - ERR("We never got a certs cell"); - if (conn->handshake_state->auth_cert == NULL) - ERR("We never got an authentication certificate"); - if (conn->handshake_state->id_cert == NULL) - ERR("We never got an identity certificate"); - if (cell->payload_len < 4) - ERR("Cell was way too short"); - - auth = cell->payload; - { - uint16_t type = ntohs(get_uint16(auth)); - uint16_t len = ntohs(get_uint16(auth+2)); - if (4 + len > cell->payload_len) - ERR("Authenticator was truncated"); - - if (type != AUTHTYPE_RSA_SHA256_TLSSECRET) - ERR("Authenticator type was not recognized"); - - auth += 4; - authlen = len; - } - - if (authlen < V3_AUTH_BODY_LEN + 1) - ERR("Authenticator was too short"); - - if (connection_or_compute_authenticate_cell_body( - conn, expected, sizeof(expected), NULL, 1) < 0) - ERR("Couldn't compute expected AUTHENTICATE cell body"); - - if (tor_memneq(expected, auth, sizeof(expected))) - ERR("Some field in the AUTHENTICATE cell body was not as expected"); - - { - crypto_pk_t *pk = tor_tls_cert_get_key( - conn->handshake_state->auth_cert); - char d[DIGEST256_LEN]; - char *signed_data; - size_t keysize; - int signed_len; - if (!pk) - ERR("Internal error: couldn't get RSA key from AUTH cert."); - crypto_digest256(d, (char*)auth, V3_AUTH_BODY_LEN, DIGEST_SHA256); - - keysize = crypto_pk_keysize(pk); - signed_data = tor_malloc(keysize); - signed_len = crypto_pk_public_checksig(pk, signed_data, keysize, - (char*)auth + V3_AUTH_BODY_LEN, - authlen - V3_AUTH_BODY_LEN); - crypto_pk_free(pk); - if (signed_len < 0) { - tor_free(signed_data); - ERR("Signature wasn't valid"); - } - if (signed_len < DIGEST256_LEN) { - tor_free(signed_data); - ERR("Not enough data was signed"); - } - /* Note that we deliberately allow *more* than DIGEST256_LEN bytes here, - * in case they're later used to hold a SHA3 digest or something. */ - if (tor_memneq(signed_data, d, DIGEST256_LEN)) { - tor_free(signed_data); - ERR("Signature did not match data to be signed."); - } - tor_free(signed_data); - } - - /* Okay, we are authenticated. */ - conn->handshake_state->received_authenticate = 1; - conn->handshake_state->authenticated = 1; - conn->handshake_state->digest_received_data = 0; - { - crypto_pk_t *identity_rcvd = - tor_tls_cert_get_key(conn->handshake_state->id_cert); - const digests_t *id_digests = - tor_cert_get_id_digests(conn->handshake_state->id_cert); - - /* This must exist; we checked key type when reading the cert. */ - tor_assert(id_digests); - - memcpy(conn->handshake_state->authenticated_peer_id, - id_digests->d[DIGEST_SHA1], DIGEST_LEN); - - connection_or_set_circid_type(conn, identity_rcvd); - crypto_pk_free(identity_rcvd); - - connection_or_init_conn_from_address(conn, - &conn->_base.addr, - conn->_base.port, - (const char*)conn->handshake_state->authenticated_peer_id, - 0); - - log_info(LD_OR, "Got an AUTHENTICATE cell from %s:%d: Looks good.", - safe_str(conn->_base.address), conn->_base.port); - } +void +command_setup_listener(channel_t *listener) +{ + tor_assert(listener); + tor_assert(listener->state == CHANNEL_STATE_LISTENING); -#undef ERR + channel_set_listener(listener, command_handle_incoming_channel); } diff --git a/src/or/command.h b/src/or/command.h index 078ccc9..eddce87 100644 --- a/src/or/command.h +++ b/src/or/command.h @@ -12,8 +12,12 @@ #ifndef _TOR_COMMAND_H #define _TOR_COMMAND_H -void command_process_cell(cell_t *cell, or_connection_t *conn); -void command_process_var_cell(var_cell_t *cell, or_connection_t *conn); +#include "channel.h" + +void command_process_cell(channel_t *chan, cell_t *cell); +void command_process_var_cell(channel_t *chan, var_cell_t *cell); +void command_setup_channel(channel_t *chan); +void command_setup_listener(channel_t *chan); extern uint64_t stats_n_padding_cells_processed; extern uint64_t stats_n_create_cells_processed;

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