[tor-commits] [tor/master] Merge branch 'maint-0.3.4'
nickm at torproject.org
nickm at torproject.org
Fri Jul 20 14:42:35 UTC 2018
commit 583df33e2079c6f7b5e0ebe34b5f29d8739a673b
Merge: 3c4901901 977821e59
Author: Nick Mathewson <nickm at torproject.org>
Date: Fri Jul 20 10:42:29 2018 -0400
Merge branch 'maint-0.3.4'
changes/ticket26647 | 4 ++++
src/feature/control/control.c | 4 ++++
2 files changed, 8 insertions(+)
diff --cc src/feature/control/control.c
index 12f10926b,000000000..f22df30e1
mode 100644,000000..100644
--- a/src/feature/control/control.c
+++ b/src/feature/control/control.c
@@@ -1,7802 -1,0 +1,7806 @@@
+
+/* Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
+ * Copyright (c) 2007-2018, The Tor Project, Inc. */
+/* See LICENSE for licensing information */
+
+/**
+ * \file control.c
+ * \brief Implementation for Tor's control-socket interface.
+ *
+ * A "controller" is an external program that monitors and controls a Tor
+ * instance via a text-based protocol. It connects to Tor via a connection
+ * to a local socket.
+ *
+ * The protocol is line-driven. The controller sends commands terminated by a
+ * CRLF. Tor sends lines that are either <em>replies</em> to what the
+ * controller has said, or <em>events</em> that Tor sends to the controller
+ * asynchronously based on occurrences in the Tor network model.
+ *
+ * See the control-spec.txt file in the torspec.git repository for full
+ * details on protocol.
+ *
+ * This module generally has two kinds of entry points: those based on having
+ * received a command on a controller socket, which are handled in
+ * connection_control_process_inbuf(), and dispatched to individual functions
+ * with names like control_handle_COMMANDNAME(); and those based on events
+ * that occur elsewhere in Tor, which are handled by functions with names like
+ * control_event_EVENTTYPE().
+ *
+ * Controller events are not sent immediately; rather, they are inserted into
+ * the queued_control_events array, and flushed later from
+ * flush_queued_events_cb(). Doing this simplifies our callgraph greatly,
+ * by limiting the number of places in Tor that can call back into the network
+ * stack.
+ **/
+
+#define CONTROL_PRIVATE
+
+#include "core/or/or.h"
+#include "feature/client/addressmap.h"
+#include "feature/client/bridges.h"
+#include "lib/container/buffers.h"
+#include "core/or/channel.h"
+#include "core/or/channeltls.h"
+#include "core/or/circuitbuild.h"
+#include "core/or/circuitlist.h"
+#include "core/or/circuitstats.h"
+#include "core/or/circuituse.h"
+#include "core/or/command.h"
+#include "lib/evloop/compat_libevent.h"
+#include "app/config/config.h"
+#include "app/config/confparse.h"
+#include "core/mainloop/connection.h"
+#include "core/or/connection_edge.h"
+#include "core/or/connection_or.h"
+#include "feature/control/control.h"
+#include "lib/crypt_ops/crypto_rand.h"
+#include "lib/crypt_ops/crypto_util.h"
+#include "feature/dircache/directory.h"
+#include "feature/dircache/dirserv.h"
+#include "feature/client/dnsserv.h"
+#include "feature/client/entrynodes.h"
+#include "feature/stats/geoip.h"
+#include "feature/hibernate/hibernate.h"
+#include "feature/hs/hs_cache.h"
+#include "feature/hs/hs_common.h"
+#include "feature/hs/hs_control.h"
+#include "core/mainloop/main.h"
+#include "feature/nodelist/microdesc.h"
+#include "feature/nodelist/networkstatus.h"
+#include "feature/nodelist/nodelist.h"
+#include "core/or/policies.h"
+#include "core/proto/proto_control0.h"
+#include "core/proto/proto_http.h"
+#include "core/or/reasons.h"
+#include "feature/rend/rendclient.h"
+#include "feature/rend/rendcommon.h"
+#include "feature/rend/rendservice.h"
+#include "feature/stats/rephist.h"
+#include "feature/relay/router.h"
+#include "feature/nodelist/routerlist.h"
+#include "feature/nodelist/routerparse.h"
+#include "feature/hs_common/shared_random_client.h"
+#include "lib/encoding/confline.h"
+
+#include "feature/dircache/cached_dir_st.h"
+#include "feature/control/control_connection_st.h"
+#include "core/or/cpath_build_state_st.h"
+#include "core/or/entry_connection_st.h"
+#include "feature/nodelist/extrainfo_st.h"
+#include "feature/nodelist/networkstatus_st.h"
+#include "feature/nodelist/node_st.h"
+#include "core/or/or_connection_st.h"
+#include "core/or/or_circuit_st.h"
+#include "core/or/origin_circuit_st.h"
+#include "feature/nodelist/microdesc_st.h"
+#include "feature/rend/rend_authorized_client_st.h"
+#include "feature/rend/rend_encoded_v2_service_descriptor_st.h"
+#include "feature/rend/rend_service_descriptor_st.h"
+#include "feature/nodelist/routerinfo_st.h"
+#include "feature/nodelist/routerlist_st.h"
+#include "core/or/socks_request_st.h"
+
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#ifdef HAVE_SYS_STAT_H
+#include <sys/stat.h>
+#endif
+
+#ifndef _WIN32
+#include <pwd.h>
+#include <sys/resource.h>
+#endif
+
+#include "lib/crypt_ops/crypto_s2k.h"
+#include "lib/evloop/procmon.h"
+#include "lib/evloop/compat_libevent.h"
+
+/** Yield true iff <b>s</b> is the state of a control_connection_t that has
+ * finished authentication and is accepting commands. */
+#define STATE_IS_OPEN(s) ((s) == CONTROL_CONN_STATE_OPEN)
+
+/** Bitfield: The bit 1<<e is set if <b>any</b> open control
+ * connection is interested in events of type <b>e</b>. We use this
+ * so that we can decide to skip generating event messages that nobody
+ * has interest in without having to walk over the global connection
+ * list to find out.
+ **/
+typedef uint64_t event_mask_t;
+
+/** An event mask of all the events that any controller is interested in
+ * receiving. */
+static event_mask_t global_event_mask = 0;
+
+/** True iff we have disabled log messages from being sent to the controller */
+static int disable_log_messages = 0;
+
+/** Macro: true if any control connection is interested in events of type
+ * <b>e</b>. */
+#define EVENT_IS_INTERESTING(e) \
+ (!! (global_event_mask & EVENT_MASK_(e)))
+
+/** Macro: true if any event from the bitfield 'e' is interesting. */
+#define ANY_EVENT_IS_INTERESTING(e) \
+ (!! (global_event_mask & (e)))
+
+/** If we're using cookie-type authentication, how long should our cookies be?
+ */
+#define AUTHENTICATION_COOKIE_LEN 32
+
+/** If true, we've set authentication_cookie to a secret code and
+ * stored it to disk. */
+static int authentication_cookie_is_set = 0;
+/** If authentication_cookie_is_set, a secret cookie that we've stored to disk
+ * and which we're using to authenticate controllers. (If the controller can
+ * read it off disk, it has permission to connect.) */
+static uint8_t *authentication_cookie = NULL;
+
+#define SAFECOOKIE_SERVER_TO_CONTROLLER_CONSTANT \
+ "Tor safe cookie authentication server-to-controller hash"
+#define SAFECOOKIE_CONTROLLER_TO_SERVER_CONSTANT \
+ "Tor safe cookie authentication controller-to-server hash"
+#define SAFECOOKIE_SERVER_NONCE_LEN DIGEST256_LEN
+
+/** The list of onion services that have been added via ADD_ONION that do not
+ * belong to any particular control connection.
+ */
+static smartlist_t *detached_onion_services = NULL;
+
+/** A sufficiently large size to record the last bootstrap phase string. */
+#define BOOTSTRAP_MSG_LEN 1024
+
+/** What was the last bootstrap phase message we sent? We keep track
+ * of this so we can respond to getinfo status/bootstrap-phase queries. */
+static char last_sent_bootstrap_message[BOOTSTRAP_MSG_LEN];
+
+static void connection_printf_to_buf(control_connection_t *conn,
+ const char *format, ...)
+ CHECK_PRINTF(2,3);
+static void send_control_event_impl(uint16_t event,
+ const char *format, va_list ap)
+ CHECK_PRINTF(2,0);
+static int control_event_status(int type, int severity, const char *format,
+ va_list args)
+ CHECK_PRINTF(3,0);
+
+static void send_control_done(control_connection_t *conn);
+static void send_control_event(uint16_t event,
+ const char *format, ...)
+ CHECK_PRINTF(2,3);
+static int handle_control_setconf(control_connection_t *conn, uint32_t len,
+ char *body);
+static int handle_control_resetconf(control_connection_t *conn, uint32_t len,
+ char *body);
+static int handle_control_getconf(control_connection_t *conn, uint32_t len,
+ const char *body);
+static int handle_control_loadconf(control_connection_t *conn, uint32_t len,
+ const char *body);
+static int handle_control_setevents(control_connection_t *conn, uint32_t len,
+ const char *body);
+static int handle_control_authenticate(control_connection_t *conn,
+ uint32_t len,
+ const char *body);
+static int handle_control_signal(control_connection_t *conn, uint32_t len,
+ const char *body);
+static int handle_control_mapaddress(control_connection_t *conn, uint32_t len,
+ const char *body);
+static char *list_getinfo_options(void);
+static int handle_control_getinfo(control_connection_t *conn, uint32_t len,
+ const char *body);
+static int handle_control_extendcircuit(control_connection_t *conn,
+ uint32_t len,
+ const char *body);
+static int handle_control_setcircuitpurpose(control_connection_t *conn,
+ uint32_t len, const char *body);
+static int handle_control_attachstream(control_connection_t *conn,
+ uint32_t len,
+ const char *body);
+static int handle_control_postdescriptor(control_connection_t *conn,
+ uint32_t len,
+ const char *body);
+static int handle_control_redirectstream(control_connection_t *conn,
+ uint32_t len,
+ const char *body);
+static int handle_control_closestream(control_connection_t *conn, uint32_t len,
+ const char *body);
+static int handle_control_closecircuit(control_connection_t *conn,
+ uint32_t len,
+ const char *body);
+static int handle_control_resolve(control_connection_t *conn, uint32_t len,
+ const char *body);
+static int handle_control_usefeature(control_connection_t *conn,
+ uint32_t len,
+ const char *body);
+static int handle_control_hsfetch(control_connection_t *conn, uint32_t len,
+ const char *body);
+static int handle_control_hspost(control_connection_t *conn, uint32_t len,
+ const char *body);
+static int handle_control_add_onion(control_connection_t *conn, uint32_t len,
+ const char *body);
+static int handle_control_del_onion(control_connection_t *conn, uint32_t len,
+ const char *body);
+static int write_stream_target_to_buf(entry_connection_t *conn, char *buf,
+ size_t len);
+static void orconn_target_get_name(char *buf, size_t len,
+ or_connection_t *conn);
+
+static int get_cached_network_liveness(void);
+static void set_cached_network_liveness(int liveness);
+
+static void flush_queued_events_cb(mainloop_event_t *event, void *arg);
+
+static char * download_status_to_string(const download_status_t *dl);
+static void control_get_bytes_rw_last_sec(uint64_t *r, uint64_t *w);
+
+/** Convert a connection_t* to an control_connection_t*; assert if the cast is
+ * invalid. */
+control_connection_t *
+TO_CONTROL_CONN(connection_t *c)
+{
+ tor_assert(c->magic == CONTROL_CONNECTION_MAGIC);
+ return DOWNCAST(control_connection_t, c);
+}
+
+/** Given a control event code for a message event, return the corresponding
+ * log severity. */
+static inline int
+event_to_log_severity(int event)
+{
+ switch (event) {
+ case EVENT_DEBUG_MSG: return LOG_DEBUG;
+ case EVENT_INFO_MSG: return LOG_INFO;
+ case EVENT_NOTICE_MSG: return LOG_NOTICE;
+ case EVENT_WARN_MSG: return LOG_WARN;
+ case EVENT_ERR_MSG: return LOG_ERR;
+ default: return -1;
+ }
+}
+
+/** Given a log severity, return the corresponding control event code. */
+static inline int
+log_severity_to_event(int severity)
+{
+ switch (severity) {
+ case LOG_DEBUG: return EVENT_DEBUG_MSG;
+ case LOG_INFO: return EVENT_INFO_MSG;
+ case LOG_NOTICE: return EVENT_NOTICE_MSG;
+ case LOG_WARN: return EVENT_WARN_MSG;
+ case LOG_ERR: return EVENT_ERR_MSG;
+ default: return -1;
+ }
+}
+
+/** Helper: clear bandwidth counters of all origin circuits. */
+static void
+clear_circ_bw_fields(void)
+{
+ origin_circuit_t *ocirc;
+ SMARTLIST_FOREACH_BEGIN(circuit_get_global_list(), circuit_t *, circ) {
+ if (!CIRCUIT_IS_ORIGIN(circ))
+ continue;
+ ocirc = TO_ORIGIN_CIRCUIT(circ);
+ ocirc->n_written_circ_bw = ocirc->n_read_circ_bw = 0;
+ ocirc->n_overhead_written_circ_bw = ocirc->n_overhead_read_circ_bw = 0;
+ ocirc->n_delivered_written_circ_bw = ocirc->n_delivered_read_circ_bw = 0;
+ }
+ SMARTLIST_FOREACH_END(circ);
+}
+
+/** Set <b>global_event_mask*</b> to the bitwise OR of each live control
+ * connection's event_mask field. */
+void
+control_update_global_event_mask(void)
+{
+ smartlist_t *conns = get_connection_array();
+ event_mask_t old_mask, new_mask;
+ old_mask = global_event_mask;
+ int any_old_per_sec_events = control_any_per_second_event_enabled();
+
+ global_event_mask = 0;
+ SMARTLIST_FOREACH(conns, connection_t *, _conn,
+ {
+ if (_conn->type == CONN_TYPE_CONTROL &&
+ STATE_IS_OPEN(_conn->state)) {
+ control_connection_t *conn = TO_CONTROL_CONN(_conn);
+ global_event_mask |= conn->event_mask;
+ }
+ });
+
+ new_mask = global_event_mask;
+
+ /* Handle the aftermath. Set up the log callback to tell us only what
+ * we want to hear...*/
+ control_adjust_event_log_severity();
+
+ /* Macro: true if ev was false before and is true now. */
+#define NEWLY_ENABLED(ev) \
+ (! (old_mask & (ev)) && (new_mask & (ev)))
+
+ /* ...then, if we've started logging stream or circ bw, clear the
+ * appropriate fields. */
+ if (NEWLY_ENABLED(EVENT_STREAM_BANDWIDTH_USED)) {
+ SMARTLIST_FOREACH(conns, connection_t *, conn,
+ {
+ if (conn->type == CONN_TYPE_AP) {
+ edge_connection_t *edge_conn = TO_EDGE_CONN(conn);
+ edge_conn->n_written = edge_conn->n_read = 0;
+ }
+ });
+ }
+ if (NEWLY_ENABLED(EVENT_CIRC_BANDWIDTH_USED)) {
+ clear_circ_bw_fields();
+ }
+ if (NEWLY_ENABLED(EVENT_BANDWIDTH_USED)) {
+ uint64_t r, w;
+ control_get_bytes_rw_last_sec(&r, &w);
+ }
+ if (any_old_per_sec_events != control_any_per_second_event_enabled()) {
+ reschedule_per_second_timer();
+ }
+
+#undef NEWLY_ENABLED
+}
+
+/** Adjust the log severities that result in control_event_logmsg being called
+ * to match the severity of log messages that any controllers are interested
+ * in. */
+void
+control_adjust_event_log_severity(void)
+{
+ int i;
+ int min_log_event=EVENT_ERR_MSG, max_log_event=EVENT_DEBUG_MSG;
+
+ for (i = EVENT_DEBUG_MSG; i <= EVENT_ERR_MSG; ++i) {
+ if (EVENT_IS_INTERESTING(i)) {
+ min_log_event = i;
+ break;
+ }
+ }
+ for (i = EVENT_ERR_MSG; i >= EVENT_DEBUG_MSG; --i) {
+ if (EVENT_IS_INTERESTING(i)) {
+ max_log_event = i;
+ break;
+ }
+ }
+ if (EVENT_IS_INTERESTING(EVENT_STATUS_GENERAL)) {
+ if (min_log_event > EVENT_NOTICE_MSG)
+ min_log_event = EVENT_NOTICE_MSG;
+ if (max_log_event < EVENT_ERR_MSG)
+ max_log_event = EVENT_ERR_MSG;
+ }
+ if (min_log_event <= max_log_event)
+ change_callback_log_severity(event_to_log_severity(min_log_event),
+ event_to_log_severity(max_log_event),
+ control_event_logmsg);
+ else
+ change_callback_log_severity(LOG_ERR, LOG_ERR,
+ control_event_logmsg);
+}
+
+/** Return true iff the event with code <b>c</b> is being sent to any current
+ * control connection. This is useful if the amount of work needed to prepare
+ * to call the appropriate control_event_...() function is high.
+ */
+int
+control_event_is_interesting(int event)
+{
+ return EVENT_IS_INTERESTING(event);
+}
+
+/** Return true if any event that needs to fire once a second is enabled. */
+int
+control_any_per_second_event_enabled(void)
+{
+ return ANY_EVENT_IS_INTERESTING(
+ EVENT_MASK_(EVENT_BANDWIDTH_USED) |
+ EVENT_MASK_(EVENT_CELL_STATS) |
+ EVENT_MASK_(EVENT_CIRC_BANDWIDTH_USED) |
+ EVENT_MASK_(EVENT_CONN_BW) |
+ EVENT_MASK_(EVENT_STREAM_BANDWIDTH_USED)
+ );
+}
+
+/* The value of 'get_bytes_read()' the previous time that
+ * control_get_bytes_rw_last_sec() as called. */
+static uint64_t stats_prev_n_read = 0;
+/* The value of 'get_bytes_written()' the previous time that
+ * control_get_bytes_rw_last_sec() as called. */
+static uint64_t stats_prev_n_written = 0;
+
+/**
+ * Set <b>n_read</b> and <b>n_written</b> to the total number of bytes read
+ * and written by Tor since the last call to this function.
+ *
+ * Call this only from the main thread.
+ */
+static void
+control_get_bytes_rw_last_sec(uint64_t *n_read,
+ uint64_t *n_written)
+{
+ const uint64_t stats_n_bytes_read = get_bytes_read();
+ const uint64_t stats_n_bytes_written = get_bytes_written();
+
+ *n_read = stats_n_bytes_read - stats_prev_n_read;
+ *n_written = stats_n_bytes_written - stats_prev_n_written;
+ stats_prev_n_read = stats_n_bytes_read;
+ stats_prev_n_written = stats_n_bytes_written;
+}
+
+/**
+ * Run all the controller events (if any) that are scheduled to trigger once
+ * per second.
+ */
+void
+control_per_second_events(void)
+{
+ if (!control_any_per_second_event_enabled())
+ return;
+
+ uint64_t bytes_read, bytes_written;
+ control_get_bytes_rw_last_sec(&bytes_read, &bytes_written);
+ control_event_bandwidth_used((uint32_t)bytes_read,(uint32_t)bytes_written);
+
+ control_event_stream_bandwidth_used();
+ control_event_conn_bandwidth_used();
+ control_event_circ_bandwidth_used();
+ control_event_circuit_cell_stats();
+}
+
+/** Append a NUL-terminated string <b>s</b> to the end of
+ * <b>conn</b>-\>outbuf.
+ */
+static inline void
+connection_write_str_to_buf(const char *s, control_connection_t *conn)
+{
+ size_t len = strlen(s);
+ connection_buf_add(s, len, TO_CONN(conn));
+}
+
+/** Given a <b>len</b>-character string in <b>data</b>, made of lines
+ * terminated by CRLF, allocate a new string in *<b>out</b>, and copy the
+ * contents of <b>data</b> into *<b>out</b>, adding a period before any period
+ * that appears at the start of a line, and adding a period-CRLF line at
+ * the end. Replace all LF characters sequences with CRLF. Return the number
+ * of bytes in *<b>out</b>.
+ */
+STATIC size_t
+write_escaped_data(const char *data, size_t len, char **out)
+{
+ tor_assert(len < SIZE_MAX - 9);
+ size_t sz_out = len+8+1;
+ char *outp;
+ const char *start = data, *end;
+ size_t i;
+ int start_of_line;
+ for (i=0; i < len; ++i) {
+ if (data[i] == '\n') {
+ sz_out += 2; /* Maybe add a CR; maybe add a dot. */
+ if (sz_out >= SIZE_T_CEILING) {
+ log_warn(LD_BUG, "Input to write_escaped_data was too long");
+ *out = tor_strdup(".\r\n");
+ return 3;
+ }
+ }
+ }
+ *out = outp = tor_malloc(sz_out);
+ end = data+len;
+ start_of_line = 1;
+ while (data < end) {
+ if (*data == '\n') {
+ if (data > start && data[-1] != '\r')
+ *outp++ = '\r';
+ start_of_line = 1;
+ } else if (*data == '.') {
+ if (start_of_line) {
+ start_of_line = 0;
+ *outp++ = '.';
+ }
+ } else {
+ start_of_line = 0;
+ }
+ *outp++ = *data++;
+ }
+ if (outp < *out+2 || fast_memcmp(outp-2, "\r\n", 2)) {
+ *outp++ = '\r';
+ *outp++ = '\n';
+ }
+ *outp++ = '.';
+ *outp++ = '\r';
+ *outp++ = '\n';
+ *outp = '\0'; /* NUL-terminate just in case. */
+ tor_assert(outp >= *out);
+ tor_assert((size_t)(outp - *out) <= sz_out);
+ return outp - *out;
+}
+
+/** Given a <b>len</b>-character string in <b>data</b>, made of lines
+ * terminated by CRLF, allocate a new string in *<b>out</b>, and copy
+ * the contents of <b>data</b> into *<b>out</b>, removing any period
+ * that appears at the start of a line, and replacing all CRLF sequences
+ * with LF. Return the number of
+ * bytes in *<b>out</b>. */
+STATIC size_t
+read_escaped_data(const char *data, size_t len, char **out)
+{
+ char *outp;
+ const char *next;
+ const char *end;
+
+ *out = outp = tor_malloc(len+1);
+
+ end = data+len;
+
+ while (data < end) {
+ /* we're at the start of a line. */
+ if (*data == '.')
+ ++data;
+ next = memchr(data, '\n', end-data);
+ if (next) {
+ size_t n_to_copy = next-data;
+ /* Don't copy a CR that precedes this LF. */
+ if (n_to_copy && *(next-1) == '\r')
+ --n_to_copy;
+ memcpy(outp, data, n_to_copy);
+ outp += n_to_copy;
+ data = next+1; /* This will point at the start of the next line,
+ * or the end of the string, or a period. */
+ } else {
+ memcpy(outp, data, end-data);
+ outp += (end-data);
+ *outp = '\0';
+ return outp - *out;
+ }
+ *outp++ = '\n';
+ }
+
+ *outp = '\0';
+ return outp - *out;
+}
+
+/** If the first <b>in_len_max</b> characters in <b>start</b> contain a
+ * double-quoted string with escaped characters, return the length of that
+ * string (as encoded, including quotes). Otherwise return -1. */
+static inline int
+get_escaped_string_length(const char *start, size_t in_len_max,
+ int *chars_out)
+{
+ const char *cp, *end;
+ int chars = 0;
+
+ if (*start != '\"')
+ return -1;
+
+ cp = start+1;
+ end = start+in_len_max;
+
+ /* Calculate length. */
+ while (1) {
+ if (cp >= end) {
+ return -1; /* Too long. */
+ } else if (*cp == '\\') {
+ if (++cp == end)
+ return -1; /* Can't escape EOS. */
+ ++cp;
+ ++chars;
+ } else if (*cp == '\"') {
+ break;
+ } else {
+ ++cp;
+ ++chars;
+ }
+ }
+ if (chars_out)
+ *chars_out = chars;
+ return (int)(cp - start+1);
+}
+
+/** As decode_escaped_string, but does not decode the string: copies the
+ * entire thing, including quotation marks. */
+static const char *
+extract_escaped_string(const char *start, size_t in_len_max,
+ char **out, size_t *out_len)
+{
+ int length = get_escaped_string_length(start, in_len_max, NULL);
+ if (length<0)
+ return NULL;
+ *out_len = length;
+ *out = tor_strndup(start, *out_len);
+ return start+length;
+}
+
+/** Given a pointer to a string starting at <b>start</b> containing
+ * <b>in_len_max</b> characters, decode a string beginning with one double
+ * quote, containing any number of non-quote characters or characters escaped
+ * with a backslash, and ending with a final double quote. Place the resulting
+ * string (unquoted, unescaped) into a newly allocated string in *<b>out</b>;
+ * store its length in <b>out_len</b>. On success, return a pointer to the
+ * character immediately following the escaped string. On failure, return
+ * NULL. */
+static const char *
+decode_escaped_string(const char *start, size_t in_len_max,
+ char **out, size_t *out_len)
+{
+ const char *cp, *end;
+ char *outp;
+ int len, n_chars = 0;
+
+ len = get_escaped_string_length(start, in_len_max, &n_chars);
+ if (len<0)
+ return NULL;
+
+ end = start+len-1; /* Index of last quote. */
+ tor_assert(*end == '\"');
+ outp = *out = tor_malloc(len+1);
+ *out_len = n_chars;
+
+ cp = start+1;
+ while (cp < end) {
+ if (*cp == '\\')
+ ++cp;
+ *outp++ = *cp++;
+ }
+ *outp = '\0';
+ tor_assert((outp - *out) == (int)*out_len);
+
+ return end+1;
+}
+
+/** Create and add a new controller connection on <b>sock</b>. If
+ * <b>CC_LOCAL_FD_IS_OWNER</b> is set in <b>flags</b>, this Tor process should
+ * exit when the connection closes. If <b>CC_LOCAL_FD_IS_AUTHENTICATED</b>
+ * is set, then the connection does not need to authenticate.
+ */
+int
+control_connection_add_local_fd(tor_socket_t sock, unsigned flags)
+{
+ if (BUG(! SOCKET_OK(sock)))
+ return -1;
+ const int is_owner = !!(flags & CC_LOCAL_FD_IS_OWNER);
+ const int is_authenticated = !!(flags & CC_LOCAL_FD_IS_AUTHENTICATED);
+ control_connection_t *control_conn = control_connection_new(AF_UNSPEC);
+ connection_t *conn = TO_CONN(control_conn);
+ conn->s = sock;
+ tor_addr_make_unspec(&conn->addr);
+ conn->port = 1;
+ conn->address = tor_strdup("<local socket>");
+
+ /* We take ownership of this socket so that later, when we close it,
+ * we don't freak out. */
+ tor_take_socket_ownership(sock);
+
+ if (set_socket_nonblocking(sock) < 0 ||
+ connection_add(conn) < 0) {
+ connection_free(conn);
+ return -1;
+ }
+
+ control_conn->is_owning_control_connection = is_owner;
+
+ if (connection_init_accepted_conn(conn, NULL) < 0) {
+ connection_mark_for_close(conn);
+ return -1;
+ }
+
+ if (is_authenticated) {
+ conn->state = CONTROL_CONN_STATE_OPEN;
+ }
+
+ return 0;
+}
+
+/** Acts like sprintf, but writes its formatted string to the end of
+ * <b>conn</b>-\>outbuf. */
+static void
+connection_printf_to_buf(control_connection_t *conn, const char *format, ...)
+{
+ va_list ap;
+ char *buf = NULL;
+ int len;
+
+ va_start(ap,format);
+ len = tor_vasprintf(&buf, format, ap);
+ va_end(ap);
+
+ if (len < 0) {
+ log_err(LD_BUG, "Unable to format string for controller.");
+ tor_assert(0);
+ }
+
+ connection_buf_add(buf, (size_t)len, TO_CONN(conn));
+
+ tor_free(buf);
+}
+
+/** Write all of the open control ports to ControlPortWriteToFile */
+void
+control_ports_write_to_file(void)
+{
+ smartlist_t *lines;
+ char *joined = NULL;
+ const or_options_t *options = get_options();
+
+ if (!options->ControlPortWriteToFile)
+ return;
+
+ lines = smartlist_new();
+
+ SMARTLIST_FOREACH_BEGIN(get_connection_array(), const connection_t *, conn) {
+ if (conn->type != CONN_TYPE_CONTROL_LISTENER || conn->marked_for_close)
+ continue;
+#ifdef AF_UNIX
+ if (conn->socket_family == AF_UNIX) {
+ smartlist_add_asprintf(lines, "UNIX_PORT=%s\n", conn->address);
+ continue;
+ }
+#endif /* defined(AF_UNIX) */
+ smartlist_add_asprintf(lines, "PORT=%s:%d\n", conn->address, conn->port);
+ } SMARTLIST_FOREACH_END(conn);
+
+ joined = smartlist_join_strings(lines, "", 0, NULL);
+
+ if (write_str_to_file(options->ControlPortWriteToFile, joined, 0) < 0) {
+ log_warn(LD_CONTROL, "Writing %s failed: %s",
+ options->ControlPortWriteToFile, strerror(errno));
+ }
+#ifndef _WIN32
+ if (options->ControlPortFileGroupReadable) {
+ if (chmod(options->ControlPortWriteToFile, 0640)) {
+ log_warn(LD_FS,"Unable to make %s group-readable.",
+ options->ControlPortWriteToFile);
+ }
+ }
+#endif /* !defined(_WIN32) */
+ tor_free(joined);
+ SMARTLIST_FOREACH(lines, char *, cp, tor_free(cp));
+ smartlist_free(lines);
+}
+
+/** Send a "DONE" message down the control connection <b>conn</b>. */
+static void
+send_control_done(control_connection_t *conn)
+{
+ connection_write_str_to_buf("250 OK\r\n", conn);
+}
+
+/** Represents an event that's queued to be sent to one or more
+ * controllers. */
+typedef struct queued_event_s {
+ uint16_t event;
+ char *msg;
+} queued_event_t;
+
+/** Pointer to int. If this is greater than 0, we don't allow new events to be
+ * queued. */
+static tor_threadlocal_t block_event_queue_flag;
+
+/** Holds a smartlist of queued_event_t objects that may need to be sent
+ * to one or more controllers */
+static smartlist_t *queued_control_events = NULL;
+
+/** True if the flush_queued_events_event is pending. */
+static int flush_queued_event_pending = 0;
+
+/** Lock to protect the above fields. */
+static tor_mutex_t *queued_control_events_lock = NULL;
+
+/** An event that should fire in order to flush the contents of
+ * queued_control_events. */
+static mainloop_event_t *flush_queued_events_event = NULL;
+
+void
+control_initialize_event_queue(void)
+{
+ if (queued_control_events == NULL) {
+ queued_control_events = smartlist_new();
+ }
+
+ if (flush_queued_events_event == NULL) {
+ struct event_base *b = tor_libevent_get_base();
+ if (b) {
+ flush_queued_events_event =
+ mainloop_event_new(flush_queued_events_cb, NULL);
+ tor_assert(flush_queued_events_event);
+ }
+ }
+
+ if (queued_control_events_lock == NULL) {
+ queued_control_events_lock = tor_mutex_new();
+ tor_threadlocal_init(&block_event_queue_flag);
+ }
+}
+
+static int *
+get_block_event_queue(void)
+{
+ int *val = tor_threadlocal_get(&block_event_queue_flag);
+ if (PREDICT_UNLIKELY(val == NULL)) {
+ val = tor_malloc_zero(sizeof(int));
+ tor_threadlocal_set(&block_event_queue_flag, val);
+ }
+ return val;
+}
+
+/** Helper: inserts an event on the list of events queued to be sent to
+ * one or more controllers, and schedules the events to be flushed if needed.
+ *
+ * This function takes ownership of <b>msg</b>, and may free it.
+ *
+ * We queue these events rather than send them immediately in order to break
+ * the dependency in our callgraph from code that generates events for the
+ * controller, and the network layer at large. Otherwise, nearly every
+ * interesting part of Tor would potentially call every other interesting part
+ * of Tor.
+ */
+MOCK_IMPL(STATIC void,
+queue_control_event_string,(uint16_t event, char *msg))
+{
+ /* This is redundant with checks done elsewhere, but it's a last-ditch
+ * attempt to avoid queueing something we shouldn't have to queue. */
+ if (PREDICT_UNLIKELY( ! EVENT_IS_INTERESTING(event) )) {
+ tor_free(msg);
+ return;
+ }
+
+ int *block_event_queue = get_block_event_queue();
+ if (*block_event_queue) {
+ tor_free(msg);
+ return;
+ }
+
+ queued_event_t *ev = tor_malloc(sizeof(*ev));
+ ev->event = event;
+ ev->msg = msg;
+
+ /* No queueing an event while queueing an event */
+ ++*block_event_queue;
+
+ tor_mutex_acquire(queued_control_events_lock);
+ tor_assert(queued_control_events);
+ smartlist_add(queued_control_events, ev);
+
+ int activate_event = 0;
+ if (! flush_queued_event_pending && in_main_thread()) {
+ activate_event = 1;
+ flush_queued_event_pending = 1;
+ }
+
+ tor_mutex_release(queued_control_events_lock);
+
+ --*block_event_queue;
+
+ /* We just put an event on the queue; mark the queue to be
+ * flushed. We only do this from the main thread for now; otherwise,
+ * we'd need to incur locking overhead in Libevent or use a socket.
+ */
+ if (activate_event) {
+ tor_assert(flush_queued_events_event);
+ mainloop_event_activate(flush_queued_events_event);
+ }
+}
+
+#define queued_event_free(ev) \
+ FREE_AND_NULL(queued_event_t, queued_event_free_, (ev))
+
+/** Release all storage held by <b>ev</b>. */
+static void
+queued_event_free_(queued_event_t *ev)
+{
+ if (ev == NULL)
+ return;
+
+ tor_free(ev->msg);
+ tor_free(ev);
+}
+
+/** Send every queued event to every controller that's interested in it,
+ * and remove the events from the queue. If <b>force</b> is true,
+ * then make all controllers send their data out immediately, since we
+ * may be about to shut down. */
+static void
+queued_events_flush_all(int force)
+{
+ /* Make sure that we get all the pending log events, if there are any. */
+ flush_pending_log_callbacks();
+
+ if (PREDICT_UNLIKELY(queued_control_events == NULL)) {
+ return;
+ }
+ smartlist_t *all_conns = get_connection_array();
+ smartlist_t *controllers = smartlist_new();
+ smartlist_t *queued_events;
+
+ int *block_event_queue = get_block_event_queue();
+ ++*block_event_queue;
+
+ tor_mutex_acquire(queued_control_events_lock);
+ /* No queueing an event while flushing events. */
+ flush_queued_event_pending = 0;
+ queued_events = queued_control_events;
+ queued_control_events = smartlist_new();
+ tor_mutex_release(queued_control_events_lock);
+
+ /* Gather all the controllers that will care... */
+ SMARTLIST_FOREACH_BEGIN(all_conns, connection_t *, conn) {
+ if (conn->type == CONN_TYPE_CONTROL &&
+ !conn->marked_for_close &&
+ conn->state == CONTROL_CONN_STATE_OPEN) {
+ control_connection_t *control_conn = TO_CONTROL_CONN(conn);
+
+ smartlist_add(controllers, control_conn);
+ }
+ } SMARTLIST_FOREACH_END(conn);
+
+ SMARTLIST_FOREACH_BEGIN(queued_events, queued_event_t *, ev) {
+ const event_mask_t bit = ((event_mask_t)1) << ev->event;
+ const size_t msg_len = strlen(ev->msg);
+ SMARTLIST_FOREACH_BEGIN(controllers, control_connection_t *,
+ control_conn) {
+ if (control_conn->event_mask & bit) {
+ connection_buf_add(ev->msg, msg_len, TO_CONN(control_conn));
+ }
+ } SMARTLIST_FOREACH_END(control_conn);
+
+ queued_event_free(ev);
+ } SMARTLIST_FOREACH_END(ev);
+
+ if (force) {
+ SMARTLIST_FOREACH_BEGIN(controllers, control_connection_t *,
+ control_conn) {
+ connection_flush(TO_CONN(control_conn));
+ } SMARTLIST_FOREACH_END(control_conn);
+ }
+
+ smartlist_free(queued_events);
+ smartlist_free(controllers);
+
+ --*block_event_queue;
+}
+
+/** Libevent callback: Flushes pending events to controllers that are
+ * interested in them. */
+static void
+flush_queued_events_cb(mainloop_event_t *event, void *arg)
+{
+ (void) event;
+ (void) arg;
+ queued_events_flush_all(0);
+}
+
+/** Send an event to all v1 controllers that are listening for code
+ * <b>event</b>. The event's body is given by <b>msg</b>.
+ *
+ * The EXTENDED_FORMAT and NONEXTENDED_FORMAT flags behave similarly with
+ * respect to the EXTENDED_EVENTS feature. */
+MOCK_IMPL(STATIC void,
+send_control_event_string,(uint16_t event,
+ const char *msg))
+{
+ tor_assert(event >= EVENT_MIN_ && event <= EVENT_MAX_);
+ queue_control_event_string(event, tor_strdup(msg));
+}
+
+/** Helper for send_control_event and control_event_status:
+ * Send an event to all v1 controllers that are listening for code
+ * <b>event</b>. The event's body is created by the printf-style format in
+ * <b>format</b>, and other arguments as provided. */
+static void
+send_control_event_impl(uint16_t event,
+ const char *format, va_list ap)
+{
+ char *buf = NULL;
+ int len;
+
+ len = tor_vasprintf(&buf, format, ap);
+ if (len < 0) {
+ log_warn(LD_BUG, "Unable to format event for controller.");
+ return;
+ }
+
+ queue_control_event_string(event, buf);
+}
+
+/** Send an event to all v1 controllers that are listening for code
+ * <b>event</b>. The event's body is created by the printf-style format in
+ * <b>format</b>, and other arguments as provided. */
+static void
+send_control_event(uint16_t event,
+ const char *format, ...)
+{
+ va_list ap;
+ va_start(ap, format);
+ send_control_event_impl(event, format, ap);
+ va_end(ap);
+}
+
+/** Given a text circuit <b>id</b>, return the corresponding circuit. */
+static origin_circuit_t *
+get_circ(const char *id)
+{
+ uint32_t n_id;
+ int ok;
+ n_id = (uint32_t) tor_parse_ulong(id, 10, 0, UINT32_MAX, &ok, NULL);
+ if (!ok)
+ return NULL;
+ return circuit_get_by_global_id(n_id);
+}
+
+/** Given a text stream <b>id</b>, return the corresponding AP connection. */
+static entry_connection_t *
+get_stream(const char *id)
+{
+ uint64_t n_id;
+ int ok;
+ connection_t *conn;
+ n_id = tor_parse_uint64(id, 10, 0, UINT64_MAX, &ok, NULL);
+ if (!ok)
+ return NULL;
+ conn = connection_get_by_global_id(n_id);
+ if (!conn || conn->type != CONN_TYPE_AP || conn->marked_for_close)
+ return NULL;
+ return TO_ENTRY_CONN(conn);
+}
+
+/** Helper for setconf and resetconf. Acts like setconf, except
+ * it passes <b>use_defaults</b> on to options_trial_assign(). Modifies the
+ * contents of body.
+ */
+static int
+control_setconf_helper(control_connection_t *conn, uint32_t len, char *body,
+ int use_defaults)
+{
+ setopt_err_t opt_err;
+ config_line_t *lines=NULL;
+ char *start = body;
+ char *errstring = NULL;
+ const unsigned flags =
+ CAL_CLEAR_FIRST | (use_defaults ? CAL_USE_DEFAULTS : 0);
+
+ char *config;
+ smartlist_t *entries = smartlist_new();
+
+ /* We have a string, "body", of the format '(key(=val|="val")?)' entries
+ * separated by space. break it into a list of configuration entries. */
+ while (*body) {
+ char *eq = body;
+ char *key;
+ char *entry;
+ while (!TOR_ISSPACE(*eq) && *eq != '=')
+ ++eq;
+ key = tor_strndup(body, eq-body);
+ body = eq+1;
+ if (*eq == '=') {
+ char *val=NULL;
+ size_t val_len=0;
+ if (*body != '\"') {
+ char *val_start = body;
+ while (!TOR_ISSPACE(*body))
+ body++;
+ val = tor_strndup(val_start, body-val_start);
+ val_len = strlen(val);
+ } else {
+ body = (char*)extract_escaped_string(body, (len - (body-start)),
+ &val, &val_len);
+ if (!body) {
+ connection_write_str_to_buf("551 Couldn't parse string\r\n", conn);
+ SMARTLIST_FOREACH(entries, char *, cp, tor_free(cp));
+ smartlist_free(entries);
+ tor_free(key);
+ return 0;
+ }
+ }
+ tor_asprintf(&entry, "%s %s", key, val);
+ tor_free(key);
+ tor_free(val);
+ } else {
+ entry = key;
+ }
+ smartlist_add(entries, entry);
+ while (TOR_ISSPACE(*body))
+ ++body;
+ }
+
+ smartlist_add_strdup(entries, "");
+ config = smartlist_join_strings(entries, "\n", 0, NULL);
+ SMARTLIST_FOREACH(entries, char *, cp, tor_free(cp));
+ smartlist_free(entries);
+
+ if (config_get_lines(config, &lines, 0) < 0) {
+ log_warn(LD_CONTROL,"Controller gave us config lines we can't parse.");
+ connection_write_str_to_buf("551 Couldn't parse configuration\r\n",
+ conn);
+ tor_free(config);
+ return 0;
+ }
+ tor_free(config);
+
+ opt_err = options_trial_assign(lines, flags, &errstring);
+ {
+ const char *msg;
+ switch (opt_err) {
+ case SETOPT_ERR_MISC:
+ msg = "552 Unrecognized option";
+ break;
+ case SETOPT_ERR_PARSE:
+ msg = "513 Unacceptable option value";
+ break;
+ case SETOPT_ERR_TRANSITION:
+ msg = "553 Transition not allowed";
+ break;
+ case SETOPT_ERR_SETTING:
+ default:
+ msg = "553 Unable to set option";
+ break;
+ case SETOPT_OK:
+ config_free_lines(lines);
+ send_control_done(conn);
+ return 0;
+ }
+ log_warn(LD_CONTROL,
+ "Controller gave us config lines that didn't validate: %s",
+ errstring);
+ connection_printf_to_buf(conn, "%s: %s\r\n", msg, errstring);
+ config_free_lines(lines);
+ tor_free(errstring);
+ return 0;
+ }
+}
+
+/** Called when we receive a SETCONF message: parse the body and try
+ * to update our configuration. Reply with a DONE or ERROR message.
+ * Modifies the contents of body.*/
+static int
+handle_control_setconf(control_connection_t *conn, uint32_t len, char *body)
+{
+ return control_setconf_helper(conn, len, body, 0);
+}
+
+/** Called when we receive a RESETCONF message: parse the body and try
+ * to update our configuration. Reply with a DONE or ERROR message.
+ * Modifies the contents of body. */
+static int
+handle_control_resetconf(control_connection_t *conn, uint32_t len, char *body)
+{
+ return control_setconf_helper(conn, len, body, 1);
+}
+
+/** Called when we receive a GETCONF message. Parse the request, and
+ * reply with a CONFVALUE or an ERROR message */
+static int
+handle_control_getconf(control_connection_t *conn, uint32_t body_len,
+ const char *body)
+{
+ smartlist_t *questions = smartlist_new();
+ smartlist_t *answers = smartlist_new();
+ smartlist_t *unrecognized = smartlist_new();
+ char *msg = NULL;
+ size_t msg_len;
+ const or_options_t *options = get_options();
+ int i, len;
+
+ (void) body_len; /* body is NUL-terminated; so we can ignore len. */
+ smartlist_split_string(questions, body, " ",
+ SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, 0);
+ SMARTLIST_FOREACH_BEGIN(questions, const char *, q) {
+ if (!option_is_recognized(q)) {
+ smartlist_add(unrecognized, (char*) q);
+ } else {
+ config_line_t *answer = option_get_assignment(options,q);
+ if (!answer) {
+ const char *name = option_get_canonical_name(q);
+ smartlist_add_asprintf(answers, "250-%s\r\n", name);
+ }
+
+ while (answer) {
+ config_line_t *next;
+ smartlist_add_asprintf(answers, "250-%s=%s\r\n",
+ answer->key, answer->value);
+
+ next = answer->next;
+ tor_free(answer->key);
+ tor_free(answer->value);
+ tor_free(answer);
+ answer = next;
+ }
+ }
+ } SMARTLIST_FOREACH_END(q);
+
+ if ((len = smartlist_len(unrecognized))) {
+ for (i=0; i < len-1; ++i)
+ connection_printf_to_buf(conn,
+ "552-Unrecognized configuration key \"%s\"\r\n",
+ (char*)smartlist_get(unrecognized, i));
+ connection_printf_to_buf(conn,
+ "552 Unrecognized configuration key \"%s\"\r\n",
+ (char*)smartlist_get(unrecognized, len-1));
+ } else if ((len = smartlist_len(answers))) {
+ char *tmp = smartlist_get(answers, len-1);
+ tor_assert(strlen(tmp)>4);
+ tmp[3] = ' ';
+ msg = smartlist_join_strings(answers, "", 0, &msg_len);
+ connection_buf_add(msg, msg_len, TO_CONN(conn));
+ } else {
+ connection_write_str_to_buf("250 OK\r\n", conn);
+ }
+
+ SMARTLIST_FOREACH(answers, char *, cp, tor_free(cp));
+ smartlist_free(answers);
+ SMARTLIST_FOREACH(questions, char *, cp, tor_free(cp));
+ smartlist_free(questions);
+ smartlist_free(unrecognized);
+
+ tor_free(msg);
+
+ return 0;
+}
+
+/** Called when we get a +LOADCONF message. */
+static int
+handle_control_loadconf(control_connection_t *conn, uint32_t len,
+ const char *body)
+{
+ setopt_err_t retval;
+ char *errstring = NULL;
+ const char *msg = NULL;
+ (void) len;
+
+ retval = options_init_from_string(NULL, body, CMD_RUN_TOR, NULL, &errstring);
+
+ if (retval != SETOPT_OK)
+ log_warn(LD_CONTROL,
+ "Controller gave us config file that didn't validate: %s",
+ errstring);
+
+ switch (retval) {
+ case SETOPT_ERR_PARSE:
+ msg = "552 Invalid config file";
+ break;
+ case SETOPT_ERR_TRANSITION:
+ msg = "553 Transition not allowed";
+ break;
+ case SETOPT_ERR_SETTING:
+ msg = "553 Unable to set option";
+ break;
+ case SETOPT_ERR_MISC:
+ default:
+ msg = "550 Unable to load config";
+ break;
+ case SETOPT_OK:
+ break;
+ }
+ if (msg) {
+ if (errstring)
+ connection_printf_to_buf(conn, "%s: %s\r\n", msg, errstring);
+ else
+ connection_printf_to_buf(conn, "%s\r\n", msg);
+ } else {
+ send_control_done(conn);
+ }
+ tor_free(errstring);
+ return 0;
+}
+
+/** Helper structure: maps event values to their names. */
+struct control_event_t {
+ uint16_t event_code;
+ const char *event_name;
+};
+/** Table mapping event values to their names. Used to implement SETEVENTS
+ * and GETINFO events/names, and to keep they in sync. */
+static const struct control_event_t control_event_table[] = {
+ { EVENT_CIRCUIT_STATUS, "CIRC" },
+ { EVENT_CIRCUIT_STATUS_MINOR, "CIRC_MINOR" },
+ { EVENT_STREAM_STATUS, "STREAM" },
+ { EVENT_OR_CONN_STATUS, "ORCONN" },
+ { EVENT_BANDWIDTH_USED, "BW" },
+ { EVENT_DEBUG_MSG, "DEBUG" },
+ { EVENT_INFO_MSG, "INFO" },
+ { EVENT_NOTICE_MSG, "NOTICE" },
+ { EVENT_WARN_MSG, "WARN" },
+ { EVENT_ERR_MSG, "ERR" },
+ { EVENT_NEW_DESC, "NEWDESC" },
+ { EVENT_ADDRMAP, "ADDRMAP" },
+ { EVENT_DESCCHANGED, "DESCCHANGED" },
+ { EVENT_NS, "NS" },
+ { EVENT_STATUS_GENERAL, "STATUS_GENERAL" },
+ { EVENT_STATUS_CLIENT, "STATUS_CLIENT" },
+ { EVENT_STATUS_SERVER, "STATUS_SERVER" },
+ { EVENT_GUARD, "GUARD" },
+ { EVENT_STREAM_BANDWIDTH_USED, "STREAM_BW" },
+ { EVENT_CLIENTS_SEEN, "CLIENTS_SEEN" },
+ { EVENT_NEWCONSENSUS, "NEWCONSENSUS" },
+ { EVENT_BUILDTIMEOUT_SET, "BUILDTIMEOUT_SET" },
+ { EVENT_GOT_SIGNAL, "SIGNAL" },
+ { EVENT_CONF_CHANGED, "CONF_CHANGED"},
+ { EVENT_CONN_BW, "CONN_BW" },
+ { EVENT_CELL_STATS, "CELL_STATS" },
+ { EVENT_CIRC_BANDWIDTH_USED, "CIRC_BW" },
+ { EVENT_TRANSPORT_LAUNCHED, "TRANSPORT_LAUNCHED" },
+ { EVENT_HS_DESC, "HS_DESC" },
+ { EVENT_HS_DESC_CONTENT, "HS_DESC_CONTENT" },
+ { EVENT_NETWORK_LIVENESS, "NETWORK_LIVENESS" },
+ { 0, NULL },
+};
+
+/** Called when we get a SETEVENTS message: update conn->event_mask,
+ * and reply with DONE or ERROR. */
+static int
+handle_control_setevents(control_connection_t *conn, uint32_t len,
+ const char *body)
+{
+ int event_code;
+ event_mask_t event_mask = 0;
+ smartlist_t *events = smartlist_new();
+
+ (void) len;
+
+ smartlist_split_string(events, body, " ",
+ SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, 0);
+ SMARTLIST_FOREACH_BEGIN(events, const char *, ev)
+ {
+ if (!strcasecmp(ev, "EXTENDED") ||
+ !strcasecmp(ev, "AUTHDIR_NEWDESCS")) {
+ log_warn(LD_CONTROL, "The \"%s\" SETEVENTS argument is no longer "
+ "supported.", ev);
+ continue;
+ } else {
+ int i;
+ event_code = -1;
+
+ for (i = 0; control_event_table[i].event_name != NULL; ++i) {
+ if (!strcasecmp(ev, control_event_table[i].event_name)) {
+ event_code = control_event_table[i].event_code;
+ break;
+ }
+ }
+
+ if (event_code == -1) {
+ connection_printf_to_buf(conn, "552 Unrecognized event \"%s\"\r\n",
+ ev);
+ SMARTLIST_FOREACH(events, char *, e, tor_free(e));
+ smartlist_free(events);
+ return 0;
+ }
+ }
+ event_mask |= (((event_mask_t)1) << event_code);
+ }
+ SMARTLIST_FOREACH_END(ev);
+ SMARTLIST_FOREACH(events, char *, e, tor_free(e));
+ smartlist_free(events);
+
+ conn->event_mask = event_mask;
+
+ control_update_global_event_mask();
+ send_control_done(conn);
+ return 0;
+}
+
+/** Decode the hashed, base64'd passwords stored in <b>passwords</b>.
+ * Return a smartlist of acceptable passwords (unterminated strings of
+ * length S2K_RFC2440_SPECIFIER_LEN+DIGEST_LEN) on success, or NULL on
+ * failure.
+ */
+smartlist_t *
+decode_hashed_passwords(config_line_t *passwords)
+{
+ char decoded[64];
+ config_line_t *cl;
+ smartlist_t *sl = smartlist_new();
+
+ tor_assert(passwords);
+
+ for (cl = passwords; cl; cl = cl->next) {
+ const char *hashed = cl->value;
+
+ if (!strcmpstart(hashed, "16:")) {
+ if (base16_decode(decoded, sizeof(decoded), hashed+3, strlen(hashed+3))
+ != S2K_RFC2440_SPECIFIER_LEN + DIGEST_LEN
+ || strlen(hashed+3) != (S2K_RFC2440_SPECIFIER_LEN+DIGEST_LEN)*2) {
+ goto err;
+ }
+ } else {
+ if (base64_decode(decoded, sizeof(decoded), hashed, strlen(hashed))
+ != S2K_RFC2440_SPECIFIER_LEN+DIGEST_LEN) {
+ goto err;
+ }
+ }
+ smartlist_add(sl,
+ tor_memdup(decoded, S2K_RFC2440_SPECIFIER_LEN+DIGEST_LEN));
+ }
+
+ return sl;
+
+ err:
+ SMARTLIST_FOREACH(sl, char*, cp, tor_free(cp));
+ smartlist_free(sl);
+ return NULL;
+}
+
+/** Called when we get an AUTHENTICATE message. Check whether the
+ * authentication is valid, and if so, update the connection's state to
+ * OPEN. Reply with DONE or ERROR.
+ */
+static int
+handle_control_authenticate(control_connection_t *conn, uint32_t len,
+ const char *body)
+{
+ int used_quoted_string = 0;
+ const or_options_t *options = get_options();
+ const char *errstr = "Unknown error";
+ char *password;
+ size_t password_len;
+ const char *cp;
+ int i;
+ int bad_cookie=0, bad_password=0;
+ smartlist_t *sl = NULL;
+
+ if (!len) {
+ password = tor_strdup("");
+ password_len = 0;
+ } else if (TOR_ISXDIGIT(body[0])) {
+ cp = body;
+ while (TOR_ISXDIGIT(*cp))
+ ++cp;
+ i = (int)(cp - body);
+ tor_assert(i>0);
+ password_len = i/2;
+ password = tor_malloc(password_len + 1);
+ if (base16_decode(password, password_len+1, body, i)
+ != (int) password_len) {
+ connection_write_str_to_buf(
+ "551 Invalid hexadecimal encoding. Maybe you tried a plain text "
+ "password? If so, the standard requires that you put it in "
+ "double quotes.\r\n", conn);
+ connection_mark_for_close(TO_CONN(conn));
+ tor_free(password);
+ return 0;
+ }
+ } else {
+ if (!decode_escaped_string(body, len, &password, &password_len)) {
+ connection_write_str_to_buf("551 Invalid quoted string. You need "
+ "to put the password in double quotes.\r\n", conn);
+ connection_mark_for_close(TO_CONN(conn));
+ return 0;
+ }
+ used_quoted_string = 1;
+ }
+
+ if (conn->safecookie_client_hash != NULL) {
+ /* The controller has chosen safe cookie authentication; the only
+ * acceptable authentication value is the controller-to-server
+ * response. */
+
+ tor_assert(authentication_cookie_is_set);
+
+ if (password_len != DIGEST256_LEN) {
+ log_warn(LD_CONTROL,
+ "Got safe cookie authentication response with wrong length "
+ "(%d)", (int)password_len);
+ errstr = "Wrong length for safe cookie response.";
+ goto err;
+ }
+
+ if (tor_memneq(conn->safecookie_client_hash, password, DIGEST256_LEN)) {
+ log_warn(LD_CONTROL,
+ "Got incorrect safe cookie authentication response");
+ errstr = "Safe cookie response did not match expected value.";
+ goto err;
+ }
+
+ tor_free(conn->safecookie_client_hash);
+ goto ok;
+ }
+
+ if (!options->CookieAuthentication && !options->HashedControlPassword &&
+ !options->HashedControlSessionPassword) {
+ /* if Tor doesn't demand any stronger authentication, then
+ * the controller can get in with anything. */
+ goto ok;
+ }
+
+ if (options->CookieAuthentication) {
+ int also_password = options->HashedControlPassword != NULL ||
+ options->HashedControlSessionPassword != NULL;
+ if (password_len != AUTHENTICATION_COOKIE_LEN) {
+ if (!also_password) {
+ log_warn(LD_CONTROL, "Got authentication cookie with wrong length "
+ "(%d)", (int)password_len);
+ errstr = "Wrong length on authentication cookie.";
+ goto err;
+ }
+ bad_cookie = 1;
+ } else if (tor_memneq(authentication_cookie, password, password_len)) {
+ if (!also_password) {
+ log_warn(LD_CONTROL, "Got mismatched authentication cookie");
+ errstr = "Authentication cookie did not match expected value.";
+ goto err;
+ }
+ bad_cookie = 1;
+ } else {
+ goto ok;
+ }
+ }
+
+ if (options->HashedControlPassword ||
+ options->HashedControlSessionPassword) {
+ int bad = 0;
+ smartlist_t *sl_tmp;
+ char received[DIGEST_LEN];
+ int also_cookie = options->CookieAuthentication;
+ sl = smartlist_new();
+ if (options->HashedControlPassword) {
+ sl_tmp = decode_hashed_passwords(options->HashedControlPassword);
+ if (!sl_tmp)
+ bad = 1;
+ else {
+ smartlist_add_all(sl, sl_tmp);
+ smartlist_free(sl_tmp);
+ }
+ }
+ if (options->HashedControlSessionPassword) {
+ sl_tmp = decode_hashed_passwords(options->HashedControlSessionPassword);
+ if (!sl_tmp)
+ bad = 1;
+ else {
+ smartlist_add_all(sl, sl_tmp);
+ smartlist_free(sl_tmp);
+ }
+ }
+ if (bad) {
+ if (!also_cookie) {
+ log_warn(LD_BUG,
+ "Couldn't decode HashedControlPassword: invalid base16");
+ errstr="Couldn't decode HashedControlPassword value in configuration.";
+ goto err;
+ }
+ bad_password = 1;
+ SMARTLIST_FOREACH(sl, char *, str, tor_free(str));
+ smartlist_free(sl);
+ sl = NULL;
+ } else {
+ SMARTLIST_FOREACH(sl, char *, expected,
+ {
+ secret_to_key_rfc2440(received,DIGEST_LEN,
+ password,password_len,expected);
+ if (tor_memeq(expected + S2K_RFC2440_SPECIFIER_LEN,
+ received, DIGEST_LEN))
+ goto ok;
+ });
+ SMARTLIST_FOREACH(sl, char *, str, tor_free(str));
+ smartlist_free(sl);
+ sl = NULL;
+
+ if (used_quoted_string)
+ errstr = "Password did not match HashedControlPassword value from "
+ "configuration";
+ else
+ errstr = "Password did not match HashedControlPassword value from "
+ "configuration. Maybe you tried a plain text password? "
+ "If so, the standard requires that you put it in double quotes.";
+ bad_password = 1;
+ if (!also_cookie)
+ goto err;
+ }
+ }
+
+ /** We only get here if both kinds of authentication failed. */
+ tor_assert(bad_password && bad_cookie);
+ log_warn(LD_CONTROL, "Bad password or authentication cookie on controller.");
+ errstr = "Password did not match HashedControlPassword *or* authentication "
+ "cookie.";
+
+ err:
+ tor_free(password);
+ connection_printf_to_buf(conn, "515 Authentication failed: %s\r\n", errstr);
+ connection_mark_for_close(TO_CONN(conn));
+ if (sl) { /* clean up */
+ SMARTLIST_FOREACH(sl, char *, str, tor_free(str));
+ smartlist_free(sl);
+ }
+ return 0;
+ ok:
+ log_info(LD_CONTROL, "Authenticated control connection ("TOR_SOCKET_T_FORMAT
+ ")", conn->base_.s);
+ send_control_done(conn);
+ conn->base_.state = CONTROL_CONN_STATE_OPEN;
+ tor_free(password);
+ if (sl) { /* clean up */
+ SMARTLIST_FOREACH(sl, char *, str, tor_free(str));
+ smartlist_free(sl);
+ }
+ return 0;
+}
+
+/** Called when we get a SAVECONF command. Try to flush the current options to
+ * disk, and report success or failure. */
+static int
+handle_control_saveconf(control_connection_t *conn, uint32_t len,
+ const char *body)
+{
+ (void) len;
+
+ int force = !strcmpstart(body, "FORCE");
+ const or_options_t *options = get_options();
+ if ((!force && options->IncludeUsed) || options_save_current() < 0) {
+ connection_write_str_to_buf(
+ "551 Unable to write configuration to disk.\r\n", conn);
+ } else {
+ send_control_done(conn);
+ }
+ return 0;
+}
+
+struct signal_t {
+ int sig;
+ const char *signal_name;
+};
+
+static const struct signal_t signal_table[] = {
+ { SIGHUP, "RELOAD" },
+ { SIGHUP, "HUP" },
+ { SIGINT, "SHUTDOWN" },
+ { SIGUSR1, "DUMP" },
+ { SIGUSR1, "USR1" },
+ { SIGUSR2, "DEBUG" },
+ { SIGUSR2, "USR2" },
+ { SIGTERM, "HALT" },
+ { SIGTERM, "TERM" },
+ { SIGTERM, "INT" },
+ { SIGNEWNYM, "NEWNYM" },
+ { SIGCLEARDNSCACHE, "CLEARDNSCACHE"},
+ { SIGHEARTBEAT, "HEARTBEAT"},
+ { 0, NULL },
+};
+
+/** Called when we get a SIGNAL command. React to the provided signal, and
+ * report success or failure. (If the signal results in a shutdown, success
+ * may not be reported.) */
+static int
+handle_control_signal(control_connection_t *conn, uint32_t len,
+ const char *body)
+{
+ int sig = -1;
+ int i;
+ int n = 0;
+ char *s;
+
+ (void) len;
+
+ while (body[n] && ! TOR_ISSPACE(body[n]))
+ ++n;
+ s = tor_strndup(body, n);
+
+ for (i = 0; signal_table[i].signal_name != NULL; ++i) {
+ if (!strcasecmp(s, signal_table[i].signal_name)) {
+ sig = signal_table[i].sig;
+ break;
+ }
+ }
+
+ if (sig < 0)
+ connection_printf_to_buf(conn, "552 Unrecognized signal code \"%s\"\r\n",
+ s);
+ tor_free(s);
+ if (sig < 0)
+ return 0;
+
+ send_control_done(conn);
+ /* Flush the "done" first if the signal might make us shut down. */
+ if (sig == SIGTERM || sig == SIGINT)
+ connection_flush(TO_CONN(conn));
+
+ activate_signal(sig);
+
+ return 0;
+}
+
+/** Called when we get a TAKEOWNERSHIP command. Mark this connection
+ * as an owning connection, so that we will exit if the connection
+ * closes. */
+static int
+handle_control_takeownership(control_connection_t *conn, uint32_t len,
+ const char *body)
+{
+ (void)len;
+ (void)body;
+
+ conn->is_owning_control_connection = 1;
+
+ log_info(LD_CONTROL, "Control connection %d has taken ownership of this "
+ "Tor instance.",
+ (int)(conn->base_.s));
+
+ send_control_done(conn);
+ return 0;
+}
+
+/** Return true iff <b>addr</b> is unusable as a mapaddress target because of
+ * containing funny characters. */
+static int
+address_is_invalid_mapaddress_target(const char *addr)
+{
+ if (!strcmpstart(addr, "*."))
+ return address_is_invalid_destination(addr+2, 1);
+ else
+ return address_is_invalid_destination(addr, 1);
+}
+
+/** Called when we get a MAPADDRESS command; try to bind all listed addresses,
+ * and report success or failure. */
+static int
+handle_control_mapaddress(control_connection_t *conn, uint32_t len,
+ const char *body)
+{
+ smartlist_t *elts;
+ smartlist_t *lines;
+ smartlist_t *reply;
+ char *r;
+ size_t sz;
+ (void) len; /* body is NUL-terminated, so it's safe to ignore the length. */
+
+ lines = smartlist_new();
+ elts = smartlist_new();
+ reply = smartlist_new();
+ smartlist_split_string(lines, body, " ",
+ SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, 0);
+ SMARTLIST_FOREACH_BEGIN(lines, char *, line) {
+ tor_strlower(line);
+ smartlist_split_string(elts, line, "=", 0, 2);
+ if (smartlist_len(elts) == 2) {
+ const char *from = smartlist_get(elts,0);
+ const char *to = smartlist_get(elts,1);
+ if (address_is_invalid_mapaddress_target(to)) {
+ smartlist_add_asprintf(reply,
+ "512-syntax error: invalid address '%s'", to);
+ log_warn(LD_CONTROL,
+ "Skipping invalid argument '%s' in MapAddress msg", to);
+ } else if (!strcmp(from, ".") || !strcmp(from, "0.0.0.0") ||
+ !strcmp(from, "::")) {
+ const char type =
+ !strcmp(from,".") ? RESOLVED_TYPE_HOSTNAME :
+ (!strcmp(from, "0.0.0.0") ? RESOLVED_TYPE_IPV4 : RESOLVED_TYPE_IPV6);
+ const char *address = addressmap_register_virtual_address(
+ type, tor_strdup(to));
+ if (!address) {
+ smartlist_add_asprintf(reply,
+ "451-resource exhausted: skipping '%s'", line);
+ log_warn(LD_CONTROL,
+ "Unable to allocate address for '%s' in MapAddress msg",
+ safe_str_client(line));
+ } else {
+ smartlist_add_asprintf(reply, "250-%s=%s", address, to);
+ }
+ } else {
+ const char *msg;
+ if (addressmap_register_auto(from, to, 1,
+ ADDRMAPSRC_CONTROLLER, &msg) < 0) {
+ smartlist_add_asprintf(reply,
+ "512-syntax error: invalid address mapping "
+ " '%s': %s", line, msg);
+ log_warn(LD_CONTROL,
+ "Skipping invalid argument '%s' in MapAddress msg: %s",
+ line, msg);
+ } else {
+ smartlist_add_asprintf(reply, "250-%s", line);
+ }
+ }
+ } else {
+ smartlist_add_asprintf(reply, "512-syntax error: mapping '%s' is "
+ "not of expected form 'foo=bar'.", line);
+ log_info(LD_CONTROL, "Skipping MapAddress '%s': wrong "
+ "number of items.",
+ safe_str_client(line));
+ }
+ SMARTLIST_FOREACH(elts, char *, cp, tor_free(cp));
+ smartlist_clear(elts);
+ } SMARTLIST_FOREACH_END(line);
+ SMARTLIST_FOREACH(lines, char *, cp, tor_free(cp));
+ smartlist_free(lines);
+ smartlist_free(elts);
+
+ if (smartlist_len(reply)) {
+ ((char*)smartlist_get(reply,smartlist_len(reply)-1))[3] = ' ';
+ r = smartlist_join_strings(reply, "\r\n", 1, &sz);
+ connection_buf_add(r, sz, TO_CONN(conn));
+ tor_free(r);
+ } else {
+ const char *response =
+ "512 syntax error: not enough arguments to mapaddress.\r\n";
+ connection_buf_add(response, strlen(response), TO_CONN(conn));
+ }
+
+ SMARTLIST_FOREACH(reply, char *, cp, tor_free(cp));
+ smartlist_free(reply);
+ return 0;
+}
+
+/** Implementation helper for GETINFO: knows the answers for various
+ * trivial-to-implement questions. */
+static int
+getinfo_helper_misc(control_connection_t *conn, const char *question,
+ char **answer, const char **errmsg)
+{
+ (void) conn;
+ if (!strcmp(question, "version")) {
+ *answer = tor_strdup(get_version());
+ } else if (!strcmp(question, "bw-event-cache")) {
+ *answer = get_bw_samples();
+ } else if (!strcmp(question, "config-file")) {
+ const char *a = get_torrc_fname(0);
+ if (a)
+ *answer = tor_strdup(a);
+ } else if (!strcmp(question, "config-defaults-file")) {
+ const char *a = get_torrc_fname(1);
+ if (a)
+ *answer = tor_strdup(a);
+ } else if (!strcmp(question, "config-text")) {
+ *answer = options_dump(get_options(), OPTIONS_DUMP_MINIMAL);
+ } else if (!strcmp(question, "config-can-saveconf")) {
+ *answer = tor_strdup(get_options()->IncludeUsed ? "0" : "1");
+ } else if (!strcmp(question, "info/names")) {
+ *answer = list_getinfo_options();
+ } else if (!strcmp(question, "dormant")) {
+ int dormant = rep_hist_circbuilding_dormant(time(NULL));
+ *answer = tor_strdup(dormant ? "1" : "0");
+ } else if (!strcmp(question, "events/names")) {
+ int i;
+ smartlist_t *event_names = smartlist_new();
+
+ for (i = 0; control_event_table[i].event_name != NULL; ++i) {
+ smartlist_add(event_names, (char *)control_event_table[i].event_name);
+ }
+
+ *answer = smartlist_join_strings(event_names, " ", 0, NULL);
+
+ smartlist_free(event_names);
+ } else if (!strcmp(question, "signal/names")) {
+ smartlist_t *signal_names = smartlist_new();
+ int j;
+ for (j = 0; signal_table[j].signal_name != NULL; ++j) {
+ smartlist_add(signal_names, (char*)signal_table[j].signal_name);
+ }
+
+ *answer = smartlist_join_strings(signal_names, " ", 0, NULL);
+
+ smartlist_free(signal_names);
+ } else if (!strcmp(question, "features/names")) {
+ *answer = tor_strdup("VERBOSE_NAMES EXTENDED_EVENTS");
+ } else if (!strcmp(question, "address")) {
+ uint32_t addr;
+ if (router_pick_published_address(get_options(), &addr, 0) < 0) {
+ *errmsg = "Address unknown";
+ return -1;
+ }
+ *answer = tor_dup_ip(addr);
+ } else if (!strcmp(question, "traffic/read")) {
+ tor_asprintf(answer, "%"PRIu64, (get_bytes_read()));
+ } else if (!strcmp(question, "traffic/written")) {
+ tor_asprintf(answer, "%"PRIu64, (get_bytes_written()));
+ } else if (!strcmp(question, "process/pid")) {
+ int myPid = -1;
+
+#ifdef _WIN32
+ myPid = _getpid();
+#else
+ myPid = getpid();
+#endif
+
+ tor_asprintf(answer, "%d", myPid);
+ } else if (!strcmp(question, "process/uid")) {
+#ifdef _WIN32
+ *answer = tor_strdup("-1");
+#else
+ int myUid = geteuid();
+ tor_asprintf(answer, "%d", myUid);
+#endif /* defined(_WIN32) */
+ } else if (!strcmp(question, "process/user")) {
+#ifdef _WIN32
+ *answer = tor_strdup("");
+#else
+ int myUid = geteuid();
+ const struct passwd *myPwEntry = tor_getpwuid(myUid);
+
+ if (myPwEntry) {
+ *answer = tor_strdup(myPwEntry->pw_name);
+ } else {
+ *answer = tor_strdup("");
+ }
+#endif /* defined(_WIN32) */
+ } else if (!strcmp(question, "process/descriptor-limit")) {
+ int max_fds = get_max_sockets();
+ tor_asprintf(answer, "%d", max_fds);
+ } else if (!strcmp(question, "limits/max-mem-in-queues")) {
+ tor_asprintf(answer, "%"PRIu64,
+ (get_options()->MaxMemInQueues));
+ } else if (!strcmp(question, "fingerprint")) {
+ crypto_pk_t *server_key;
+ if (!server_mode(get_options())) {
+ *errmsg = "Not running in server mode";
+ return -1;
+ }
+ server_key = get_server_identity_key();
+ *answer = tor_malloc(HEX_DIGEST_LEN+1);
+ crypto_pk_get_fingerprint(server_key, *answer, 0);
+ }
+ return 0;
+}
+
+/** Awful hack: return a newly allocated string based on a routerinfo and
+ * (possibly) an extrainfo, sticking the read-history and write-history from
+ * <b>ei</b> into the resulting string. The thing you get back won't
+ * necessarily have a valid signature.
+ *
+ * New code should never use this; it's for backward compatibility.
+ *
+ * NOTE: <b>ri_body</b> is as returned by signed_descriptor_get_body: it might
+ * not be NUL-terminated. */
+static char *
+munge_extrainfo_into_routerinfo(const char *ri_body,
+ const signed_descriptor_t *ri,
+ const signed_descriptor_t *ei)
+{
+ char *out = NULL, *outp;
+ int i;
+ const char *router_sig;
+ const char *ei_body = signed_descriptor_get_body(ei);
+ size_t ri_len = ri->signed_descriptor_len;
+ size_t ei_len = ei->signed_descriptor_len;
+ if (!ei_body)
+ goto bail;
+
+ outp = out = tor_malloc(ri_len+ei_len+1);
+ if (!(router_sig = tor_memstr(ri_body, ri_len, "\nrouter-signature")))
+ goto bail;
+ ++router_sig;
+ memcpy(out, ri_body, router_sig-ri_body);
+ outp += router_sig-ri_body;
+
+ for (i=0; i < 2; ++i) {
+ const char *kwd = i ? "\nwrite-history " : "\nread-history ";
+ const char *cp, *eol;
+ if (!(cp = tor_memstr(ei_body, ei_len, kwd)))
+ continue;
+ ++cp;
+ if (!(eol = memchr(cp, '\n', ei_len - (cp-ei_body))))
+ continue;
+ memcpy(outp, cp, eol-cp+1);
+ outp += eol-cp+1;
+ }
+ memcpy(outp, router_sig, ri_len - (router_sig-ri_body));
+ *outp++ = '\0';
+ tor_assert(outp-out < (int)(ri_len+ei_len+1));
+
+ return out;
+ bail:
+ tor_free(out);
+ return tor_strndup(ri_body, ri->signed_descriptor_len);
+}
+
+/** Implementation helper for GETINFO: answers requests for information about
+ * which ports are bound. */
+static int
+getinfo_helper_listeners(control_connection_t *control_conn,
+ const char *question,
+ char **answer, const char **errmsg)
+{
+ int type;
+ smartlist_t *res;
+
+ (void)control_conn;
+ (void)errmsg;
+
+ if (!strcmp(question, "net/listeners/or"))
+ type = CONN_TYPE_OR_LISTENER;
++ else if (!strcmp(question, "net/listeners/extor"))
++ type = CONN_TYPE_EXT_OR_LISTENER;
+ else if (!strcmp(question, "net/listeners/dir"))
+ type = CONN_TYPE_DIR_LISTENER;
+ else if (!strcmp(question, "net/listeners/socks"))
+ type = CONN_TYPE_AP_LISTENER;
+ else if (!strcmp(question, "net/listeners/trans"))
+ type = CONN_TYPE_AP_TRANS_LISTENER;
+ else if (!strcmp(question, "net/listeners/natd"))
+ type = CONN_TYPE_AP_NATD_LISTENER;
++ else if (!strcmp(question, "net/listeners/httptunnel"))
++ type = CONN_TYPE_AP_HTTP_CONNECT_LISTENER;
+ else if (!strcmp(question, "net/listeners/dns"))
+ type = CONN_TYPE_AP_DNS_LISTENER;
+ else if (!strcmp(question, "net/listeners/control"))
+ type = CONN_TYPE_CONTROL_LISTENER;
+ else
+ return 0; /* unknown key */
+
+ res = smartlist_new();
+ SMARTLIST_FOREACH_BEGIN(get_connection_array(), connection_t *, conn) {
+ struct sockaddr_storage ss;
+ socklen_t ss_len = sizeof(ss);
+
+ if (conn->type != type || conn->marked_for_close || !SOCKET_OK(conn->s))
+ continue;
+
+ if (getsockname(conn->s, (struct sockaddr *)&ss, &ss_len) < 0) {
+ smartlist_add_asprintf(res, "%s:%d", conn->address, (int)conn->port);
+ } else {
+ char *tmp = tor_sockaddr_to_str((struct sockaddr *)&ss);
+ smartlist_add(res, esc_for_log(tmp));
+ tor_free(tmp);
+ }
+
+ } SMARTLIST_FOREACH_END(conn);
+
+ *answer = smartlist_join_strings(res, " ", 0, NULL);
+
+ SMARTLIST_FOREACH(res, char *, cp, tor_free(cp));
+ smartlist_free(res);
+ return 0;
+}
+
+/** Implementation helper for GETINFO: answers requests for information about
+ * the current time in both local and UTF forms. */
+STATIC int
+getinfo_helper_current_time(control_connection_t *control_conn,
+ const char *question,
+ char **answer, const char **errmsg)
+{
+ (void)control_conn;
+ (void)errmsg;
+
+ struct timeval now;
+ tor_gettimeofday(&now);
+ char timebuf[ISO_TIME_LEN+1];
+
+ if (!strcmp(question, "current-time/local"))
+ format_local_iso_time_nospace(timebuf, (time_t)now.tv_sec);
+ else if (!strcmp(question, "current-time/utc"))
+ format_iso_time_nospace(timebuf, (time_t)now.tv_sec);
+ else
+ return 0;
+
+ *answer = tor_strdup(timebuf);
+ return 0;
+}
+
+/** Implementation helper for GETINFO: knows the answers for questions about
+ * directory information. */
+STATIC int
+getinfo_helper_dir(control_connection_t *control_conn,
+ const char *question, char **answer,
+ const char **errmsg)
+{
+ (void) control_conn;
+ if (!strcmpstart(question, "desc/id/")) {
+ const routerinfo_t *ri = NULL;
+ const node_t *node = node_get_by_hex_id(question+strlen("desc/id/"), 0);
+ if (node)
+ ri = node->ri;
+ if (ri) {
+ const char *body = signed_descriptor_get_body(&ri->cache_info);
+ if (body)
+ *answer = tor_strndup(body, ri->cache_info.signed_descriptor_len);
+ } else if (! we_fetch_router_descriptors(get_options())) {
+ /* Descriptors won't be available, provide proper error */
+ *errmsg = "We fetch microdescriptors, not router "
+ "descriptors. You'll need to use md/id/* "
+ "instead of desc/id/*.";
+ return 0;
+ }
+ } else if (!strcmpstart(question, "desc/name/")) {
+ const routerinfo_t *ri = NULL;
+ /* XXX Setting 'warn_if_unnamed' here is a bit silly -- the
+ * warning goes to the user, not to the controller. */
+ const node_t *node =
+ node_get_by_nickname(question+strlen("desc/name/"), 0);
+ if (node)
+ ri = node->ri;
+ if (ri) {
+ const char *body = signed_descriptor_get_body(&ri->cache_info);
+ if (body)
+ *answer = tor_strndup(body, ri->cache_info.signed_descriptor_len);
+ } else if (! we_fetch_router_descriptors(get_options())) {
+ /* Descriptors won't be available, provide proper error */
+ *errmsg = "We fetch microdescriptors, not router "
+ "descriptors. You'll need to use md/name/* "
+ "instead of desc/name/*.";
+ return 0;
+ }
+ } else if (!strcmp(question, "desc/download-enabled")) {
+ int r = we_fetch_router_descriptors(get_options());
+ tor_asprintf(answer, "%d", !!r);
+ } else if (!strcmp(question, "desc/all-recent")) {
+ routerlist_t *routerlist = router_get_routerlist();
+ smartlist_t *sl = smartlist_new();
+ if (routerlist && routerlist->routers) {
+ SMARTLIST_FOREACH(routerlist->routers, const routerinfo_t *, ri,
+ {
+ const char *body = signed_descriptor_get_body(&ri->cache_info);
+ if (body)
+ smartlist_add(sl,
+ tor_strndup(body, ri->cache_info.signed_descriptor_len));
+ });
+ }
+ *answer = smartlist_join_strings(sl, "", 0, NULL);
+ SMARTLIST_FOREACH(sl, char *, c, tor_free(c));
+ smartlist_free(sl);
+ } else if (!strcmp(question, "desc/all-recent-extrainfo-hack")) {
+ /* XXXX Remove this once Torstat asks for extrainfos. */
+ routerlist_t *routerlist = router_get_routerlist();
+ smartlist_t *sl = smartlist_new();
+ if (routerlist && routerlist->routers) {
+ SMARTLIST_FOREACH_BEGIN(routerlist->routers, const routerinfo_t *, ri) {
+ const char *body = signed_descriptor_get_body(&ri->cache_info);
+ signed_descriptor_t *ei = extrainfo_get_by_descriptor_digest(
+ ri->cache_info.extra_info_digest);
+ if (ei && body) {
+ smartlist_add(sl, munge_extrainfo_into_routerinfo(body,
+ &ri->cache_info, ei));
+ } else if (body) {
+ smartlist_add(sl,
+ tor_strndup(body, ri->cache_info.signed_descriptor_len));
+ }
+ } SMARTLIST_FOREACH_END(ri);
+ }
+ *answer = smartlist_join_strings(sl, "", 0, NULL);
+ SMARTLIST_FOREACH(sl, char *, c, tor_free(c));
+ smartlist_free(sl);
+ } else if (!strcmpstart(question, "hs/client/desc/id/")) {
+ hostname_type_t addr_type;
+
+ question += strlen("hs/client/desc/id/");
+ if (rend_valid_v2_service_id(question)) {
+ addr_type = ONION_V2_HOSTNAME;
+ } else if (hs_address_is_valid(question)) {
+ addr_type = ONION_V3_HOSTNAME;
+ } else {
+ *errmsg = "Invalid address";
+ return -1;
+ }
+
+ if (addr_type == ONION_V2_HOSTNAME) {
+ rend_cache_entry_t *e = NULL;
+ if (!rend_cache_lookup_entry(question, -1, &e)) {
+ /* Descriptor found in cache */
+ *answer = tor_strdup(e->desc);
+ } else {
+ *errmsg = "Not found in cache";
+ return -1;
+ }
+ } else {
+ ed25519_public_key_t service_pk;
+ const char *desc;
+
+ /* The check before this if/else makes sure of this. */
+ tor_assert(addr_type == ONION_V3_HOSTNAME);
+
+ if (hs_parse_address(question, &service_pk, NULL, NULL) < 0) {
+ *errmsg = "Invalid v3 address";
+ return -1;
+ }
+
+ desc = hs_cache_lookup_encoded_as_client(&service_pk);
+ if (desc) {
+ *answer = tor_strdup(desc);
+ } else {
+ *errmsg = "Not found in cache";
+ return -1;
+ }
+ }
+ } else if (!strcmpstart(question, "hs/service/desc/id/")) {
+ hostname_type_t addr_type;
+
+ question += strlen("hs/service/desc/id/");
+ if (rend_valid_v2_service_id(question)) {
+ addr_type = ONION_V2_HOSTNAME;
+ } else if (hs_address_is_valid(question)) {
+ addr_type = ONION_V3_HOSTNAME;
+ } else {
+ *errmsg = "Invalid address";
+ return -1;
+ }
+ rend_cache_entry_t *e = NULL;
+
+ if (addr_type == ONION_V2_HOSTNAME) {
+ if (!rend_cache_lookup_v2_desc_as_service(question, &e)) {
+ /* Descriptor found in cache */
+ *answer = tor_strdup(e->desc);
+ } else {
+ *errmsg = "Not found in cache";
+ return -1;
+ }
+ } else {
+ ed25519_public_key_t service_pk;
+ char *desc;
+
+ /* The check before this if/else makes sure of this. */
+ tor_assert(addr_type == ONION_V3_HOSTNAME);
+
+ if (hs_parse_address(question, &service_pk, NULL, NULL) < 0) {
+ *errmsg = "Invalid v3 address";
+ return -1;
+ }
+
+ desc = hs_service_lookup_current_desc(&service_pk);
+ if (desc) {
+ /* Newly allocated string, we have ownership. */
+ *answer = desc;
+ } else {
+ *errmsg = "Not found in cache";
+ return -1;
+ }
+ }
+ } else if (!strcmp(question, "md/all")) {
+ const smartlist_t *nodes = nodelist_get_list();
+ tor_assert(nodes);
+
+ if (smartlist_len(nodes) == 0) {
+ *answer = tor_strdup("");
+ return 0;
+ }
+
+ smartlist_t *microdescs = smartlist_new();
+
+ SMARTLIST_FOREACH_BEGIN(nodes, node_t *, n) {
+ if (n->md && n->md->body) {
+ char *copy = tor_strndup(n->md->body, n->md->bodylen);
+ smartlist_add(microdescs, copy);
+ }
+ } SMARTLIST_FOREACH_END(n);
+
+ *answer = smartlist_join_strings(microdescs, "", 0, NULL);
+ SMARTLIST_FOREACH(microdescs, char *, md, tor_free(md));
+ smartlist_free(microdescs);
+ } else if (!strcmpstart(question, "md/id/")) {
+ const node_t *node = node_get_by_hex_id(question+strlen("md/id/"), 0);
+ const microdesc_t *md = NULL;
+ if (node) md = node->md;
+ if (md && md->body) {
+ *answer = tor_strndup(md->body, md->bodylen);
+ }
+ } else if (!strcmpstart(question, "md/name/")) {
+ /* XXX Setting 'warn_if_unnamed' here is a bit silly -- the
+ * warning goes to the user, not to the controller. */
+ const node_t *node = node_get_by_nickname(question+strlen("md/name/"), 0);
+ /* XXXX duplicated code */
+ const microdesc_t *md = NULL;
+ if (node) md = node->md;
+ if (md && md->body) {
+ *answer = tor_strndup(md->body, md->bodylen);
+ }
+ } else if (!strcmp(question, "md/download-enabled")) {
+ int r = we_fetch_microdescriptors(get_options());
+ tor_asprintf(answer, "%d", !!r);
+ } else if (!strcmpstart(question, "desc-annotations/id/")) {
+ const routerinfo_t *ri = NULL;
+ const node_t *node =
+ node_get_by_hex_id(question+strlen("desc-annotations/id/"), 0);
+ if (node)
+ ri = node->ri;
+ if (ri) {
+ const char *annotations =
+ signed_descriptor_get_annotations(&ri->cache_info);
+ if (annotations)
+ *answer = tor_strndup(annotations,
+ ri->cache_info.annotations_len);
+ }
+ } else if (!strcmpstart(question, "dir/server/")) {
+ size_t answer_len = 0;
+ char *url = NULL;
+ smartlist_t *descs = smartlist_new();
+ const char *msg;
+ int res;
+ char *cp;
+ tor_asprintf(&url, "/tor/%s", question+4);
+ res = dirserv_get_routerdescs(descs, url, &msg);
+ if (res) {
+ log_warn(LD_CONTROL, "getinfo '%s': %s", question, msg);
+ smartlist_free(descs);
+ tor_free(url);
+ *errmsg = msg;
+ return -1;
+ }
+ SMARTLIST_FOREACH(descs, signed_descriptor_t *, sd,
+ answer_len += sd->signed_descriptor_len);
+ cp = *answer = tor_malloc(answer_len+1);
+ SMARTLIST_FOREACH(descs, signed_descriptor_t *, sd,
+ {
+ memcpy(cp, signed_descriptor_get_body(sd),
+ sd->signed_descriptor_len);
+ cp += sd->signed_descriptor_len;
+ });
+ *cp = '\0';
+ tor_free(url);
+ smartlist_free(descs);
+ } else if (!strcmpstart(question, "dir/status/")) {
+ *answer = tor_strdup("");
+ } else if (!strcmp(question, "dir/status-vote/current/consensus")) { /* v3 */
+ if (we_want_to_fetch_flavor(get_options(), FLAV_NS)) {
+ const cached_dir_t *consensus = dirserv_get_consensus("ns");
+ if (consensus)
+ *answer = tor_strdup(consensus->dir);
+ }
+ if (!*answer) { /* try loading it from disk */
+ char *filename = get_cachedir_fname("cached-consensus");
+ *answer = read_file_to_str(filename, RFTS_IGNORE_MISSING, NULL);
+ tor_free(filename);
+ if (!*answer) { /* generate an error */
+ *errmsg = "Could not open cached consensus. "
+ "Make sure FetchUselessDescriptors is set to 1.";
+ return -1;
+ }
+ }
+ } else if (!strcmp(question, "network-status")) { /* v1 */
+ static int network_status_warned = 0;
+ if (!network_status_warned) {
+ log_warn(LD_CONTROL, "GETINFO network-status is deprecated; it will "
+ "go away in a future version of Tor.");
+ network_status_warned = 1;
+ }
+ routerlist_t *routerlist = router_get_routerlist();
+ if (!routerlist || !routerlist->routers ||
+ list_server_status_v1(routerlist->routers, answer, 1) < 0) {
+ return -1;
+ }
+ } else if (!strcmpstart(question, "extra-info/digest/")) {
+ question += strlen("extra-info/digest/");
+ if (strlen(question) == HEX_DIGEST_LEN) {
+ char d[DIGEST_LEN];
+ signed_descriptor_t *sd = NULL;
+ if (base16_decode(d, sizeof(d), question, strlen(question))
+ == sizeof(d)) {
+ /* XXXX this test should move into extrainfo_get_by_descriptor_digest,
+ * but I don't want to risk affecting other parts of the code,
+ * especially since the rules for using our own extrainfo (including
+ * when it might be freed) are different from those for using one
+ * we have downloaded. */
+ if (router_extrainfo_digest_is_me(d))
+ sd = &(router_get_my_extrainfo()->cache_info);
+ else
+ sd = extrainfo_get_by_descriptor_digest(d);
+ }
+ if (sd) {
+ const char *body = signed_descriptor_get_body(sd);
+ if (body)
+ *answer = tor_strndup(body, sd->signed_descriptor_len);
+ }
+ }
+ }
+
+ return 0;
+}
+
+/** Given a smartlist of 20-byte digests, return a newly allocated string
+ * containing each of those digests in order, formatted in HEX, and terminated
+ * with a newline. */
+static char *
+digest_list_to_string(const smartlist_t *sl)
+{
+ int len;
+ char *result, *s;
+
+ /* Allow for newlines, and a \0 at the end */
+ len = smartlist_len(sl) * (HEX_DIGEST_LEN + 1) + 1;
+ result = tor_malloc_zero(len);
+
+ s = result;
+ SMARTLIST_FOREACH_BEGIN(sl, const char *, digest) {
+ base16_encode(s, HEX_DIGEST_LEN + 1, digest, DIGEST_LEN);
+ s[HEX_DIGEST_LEN] = '\n';
+ s += HEX_DIGEST_LEN + 1;
+ } SMARTLIST_FOREACH_END(digest);
+ *s = '\0';
+
+ return result;
+}
+
+/** Turn a download_status_t into a human-readable description in a newly
+ * allocated string. The format is specified in control-spec.txt, under
+ * the documentation for "GETINFO download/..." . */
+static char *
+download_status_to_string(const download_status_t *dl)
+{
+ char *rv = NULL;
+ char tbuf[ISO_TIME_LEN+1];
+ const char *schedule_str, *want_authority_str;
+ const char *increment_on_str, *backoff_str;
+
+ if (dl) {
+ /* Get some substrings of the eventual output ready */
+ format_iso_time(tbuf, download_status_get_next_attempt_at(dl));
+
+ switch (dl->schedule) {
+ case DL_SCHED_GENERIC:
+ schedule_str = "DL_SCHED_GENERIC";
+ break;
+ case DL_SCHED_CONSENSUS:
+ schedule_str = "DL_SCHED_CONSENSUS";
+ break;
+ case DL_SCHED_BRIDGE:
+ schedule_str = "DL_SCHED_BRIDGE";
+ break;
+ default:
+ schedule_str = "unknown";
+ break;
+ }
+
+ switch (dl->want_authority) {
+ case DL_WANT_ANY_DIRSERVER:
+ want_authority_str = "DL_WANT_ANY_DIRSERVER";
+ break;
+ case DL_WANT_AUTHORITY:
+ want_authority_str = "DL_WANT_AUTHORITY";
+ break;
+ default:
+ want_authority_str = "unknown";
+ break;
+ }
+
+ switch (dl->increment_on) {
+ case DL_SCHED_INCREMENT_FAILURE:
+ increment_on_str = "DL_SCHED_INCREMENT_FAILURE";
+ break;
+ case DL_SCHED_INCREMENT_ATTEMPT:
+ increment_on_str = "DL_SCHED_INCREMENT_ATTEMPT";
+ break;
+ default:
+ increment_on_str = "unknown";
+ break;
+ }
+
+ backoff_str = "DL_SCHED_RANDOM_EXPONENTIAL";
+
+ /* Now assemble them */
+ tor_asprintf(&rv,
+ "next-attempt-at %s\n"
+ "n-download-failures %u\n"
+ "n-download-attempts %u\n"
+ "schedule %s\n"
+ "want-authority %s\n"
+ "increment-on %s\n"
+ "backoff %s\n"
+ "last-backoff-position %u\n"
+ "last-delay-used %d\n",
+ tbuf,
+ dl->n_download_failures,
+ dl->n_download_attempts,
+ schedule_str,
+ want_authority_str,
+ increment_on_str,
+ backoff_str,
+ dl->last_backoff_position,
+ dl->last_delay_used);
+ }
+
+ return rv;
+}
+
+/** Handle the consensus download cases for getinfo_helper_downloads() */
+STATIC void
+getinfo_helper_downloads_networkstatus(const char *flavor,
+ download_status_t **dl_to_emit,
+ const char **errmsg)
+{
+ /*
+ * We get the one for the current bootstrapped status by default, or
+ * take an extra /bootstrap or /running suffix
+ */
+ if (strcmp(flavor, "ns") == 0) {
+ *dl_to_emit = networkstatus_get_dl_status_by_flavor(FLAV_NS);
+ } else if (strcmp(flavor, "ns/bootstrap") == 0) {
+ *dl_to_emit = networkstatus_get_dl_status_by_flavor_bootstrap(FLAV_NS);
+ } else if (strcmp(flavor, "ns/running") == 0 ) {
+ *dl_to_emit = networkstatus_get_dl_status_by_flavor_running(FLAV_NS);
+ } else if (strcmp(flavor, "microdesc") == 0) {
+ *dl_to_emit = networkstatus_get_dl_status_by_flavor(FLAV_MICRODESC);
+ } else if (strcmp(flavor, "microdesc/bootstrap") == 0) {
+ *dl_to_emit =
+ networkstatus_get_dl_status_by_flavor_bootstrap(FLAV_MICRODESC);
+ } else if (strcmp(flavor, "microdesc/running") == 0) {
+ *dl_to_emit =
+ networkstatus_get_dl_status_by_flavor_running(FLAV_MICRODESC);
+ } else {
+ *errmsg = "Unknown flavor";
+ }
+}
+
+/** Handle the cert download cases for getinfo_helper_downloads() */
+STATIC void
+getinfo_helper_downloads_cert(const char *fp_sk_req,
+ download_status_t **dl_to_emit,
+ smartlist_t **digest_list,
+ const char **errmsg)
+{
+ const char *sk_req;
+ char id_digest[DIGEST_LEN];
+ char sk_digest[DIGEST_LEN];
+
+ /*
+ * We have to handle four cases; fp_sk_req is the request with
+ * a prefix of "downloads/cert/" snipped off.
+ *
+ * Case 1: fp_sk_req = "fps"
+ * - We should emit a digest_list with a list of all the identity
+ * fingerprints that can be queried for certificate download status;
+ * get it by calling list_authority_ids_with_downloads().
+ *
+ * Case 2: fp_sk_req = "fp/<fp>" for some fingerprint fp
+ * - We want the default certificate for this identity fingerprint's
+ * download status; this is the download we get from URLs starting
+ * in /fp/ on the directory server. We can get it with
+ * id_only_download_status_for_authority_id().
+ *
+ * Case 3: fp_sk_req = "fp/<fp>/sks" for some fingerprint fp
+ * - We want a list of all signing key digests for this identity
+ * fingerprint which can be queried for certificate download status.
+ * Get it with list_sk_digests_for_authority_id().
+ *
+ * Case 4: fp_sk_req = "fp/<fp>/<sk>" for some fingerprint fp and
+ * signing key digest sk
+ * - We want the download status for the certificate for this specific
+ * signing key and fingerprint. These correspond to the ones we get
+ * from URLs starting in /fp-sk/ on the directory server. Get it with
+ * list_sk_digests_for_authority_id().
+ */
+
+ if (strcmp(fp_sk_req, "fps") == 0) {
+ *digest_list = list_authority_ids_with_downloads();
+ if (!(*digest_list)) {
+ *errmsg = "Failed to get list of authority identity digests (!)";
+ }
+ } else if (!strcmpstart(fp_sk_req, "fp/")) {
+ fp_sk_req += strlen("fp/");
+ /* Okay, look for another / to tell the fp from fp-sk cases */
+ sk_req = strchr(fp_sk_req, '/');
+ if (sk_req) {
+ /* okay, split it here and try to parse <fp> */
+ if (base16_decode(id_digest, DIGEST_LEN,
+ fp_sk_req, sk_req - fp_sk_req) == DIGEST_LEN) {
+ /* Skip past the '/' */
+ ++sk_req;
+ if (strcmp(sk_req, "sks") == 0) {
+ /* We're asking for the list of signing key fingerprints */
+ *digest_list = list_sk_digests_for_authority_id(id_digest);
+ if (!(*digest_list)) {
+ *errmsg = "Failed to get list of signing key digests for this "
+ "authority identity digest";
+ }
+ } else {
+ /* We've got a signing key digest */
+ if (base16_decode(sk_digest, DIGEST_LEN,
+ sk_req, strlen(sk_req)) == DIGEST_LEN) {
+ *dl_to_emit =
+ download_status_for_authority_id_and_sk(id_digest, sk_digest);
+ if (!(*dl_to_emit)) {
+ *errmsg = "Failed to get download status for this identity/"
+ "signing key digest pair";
+ }
+ } else {
+ *errmsg = "That didn't look like a signing key digest";
+ }
+ }
+ } else {
+ *errmsg = "That didn't look like an identity digest";
+ }
+ } else {
+ /* We're either in downloads/certs/fp/<fp>, or we can't parse <fp> */
+ if (strlen(fp_sk_req) == HEX_DIGEST_LEN) {
+ if (base16_decode(id_digest, DIGEST_LEN,
+ fp_sk_req, strlen(fp_sk_req)) == DIGEST_LEN) {
+ *dl_to_emit = id_only_download_status_for_authority_id(id_digest);
+ if (!(*dl_to_emit)) {
+ *errmsg = "Failed to get download status for this authority "
+ "identity digest";
+ }
+ } else {
+ *errmsg = "That didn't look like a digest";
+ }
+ } else {
+ *errmsg = "That didn't look like a digest";
+ }
+ }
+ } else {
+ *errmsg = "Unknown certificate download status query";
+ }
+}
+
+/** Handle the routerdesc download cases for getinfo_helper_downloads() */
+STATIC void
+getinfo_helper_downloads_desc(const char *desc_req,
+ download_status_t **dl_to_emit,
+ smartlist_t **digest_list,
+ const char **errmsg)
+{
+ char desc_digest[DIGEST_LEN];
+ /*
+ * Two cases to handle here:
+ *
+ * Case 1: desc_req = "descs"
+ * - Emit a list of all router descriptor digests, which we get by
+ * calling router_get_descriptor_digests(); this can return NULL
+ * if we have no current ns-flavor consensus.
+ *
+ * Case 2: desc_req = <fp>
+ * - Check on the specified fingerprint and emit its download_status_t
+ * using router_get_dl_status_by_descriptor_digest().
+ */
+
+ if (strcmp(desc_req, "descs") == 0) {
+ *digest_list = router_get_descriptor_digests();
+ if (!(*digest_list)) {
+ *errmsg = "We don't seem to have a networkstatus-flavored consensus";
+ }
+ /*
+ * Microdescs don't use the download_status_t mechanism, so we don't
+ * answer queries about their downloads here; see microdesc.c.
+ */
+ } else if (strlen(desc_req) == HEX_DIGEST_LEN) {
+ if (base16_decode(desc_digest, DIGEST_LEN,
+ desc_req, strlen(desc_req)) == DIGEST_LEN) {
+ /* Okay we got a digest-shaped thing; try asking for it */
+ *dl_to_emit = router_get_dl_status_by_descriptor_digest(desc_digest);
+ if (!(*dl_to_emit)) {
+ *errmsg = "No such descriptor digest found";
+ }
+ } else {
+ *errmsg = "That didn't look like a digest";
+ }
+ } else {
+ *errmsg = "Unknown router descriptor download status query";
+ }
+}
+
+/** Handle the bridge download cases for getinfo_helper_downloads() */
+STATIC void
+getinfo_helper_downloads_bridge(const char *bridge_req,
+ download_status_t **dl_to_emit,
+ smartlist_t **digest_list,
+ const char **errmsg)
+{
+ char bridge_digest[DIGEST_LEN];
+ /*
+ * Two cases to handle here:
+ *
+ * Case 1: bridge_req = "bridges"
+ * - Emit a list of all bridge identity digests, which we get by
+ * calling list_bridge_identities(); this can return NULL if we are
+ * not using bridges.
+ *
+ * Case 2: bridge_req = <fp>
+ * - Check on the specified fingerprint and emit its download_status_t
+ * using get_bridge_dl_status_by_id().
+ */
+
+ if (strcmp(bridge_req, "bridges") == 0) {
+ *digest_list = list_bridge_identities();
+ if (!(*digest_list)) {
+ *errmsg = "We don't seem to be using bridges";
+ }
+ } else if (strlen(bridge_req) == HEX_DIGEST_LEN) {
+ if (base16_decode(bridge_digest, DIGEST_LEN,
+ bridge_req, strlen(bridge_req)) == DIGEST_LEN) {
+ /* Okay we got a digest-shaped thing; try asking for it */
+ *dl_to_emit = get_bridge_dl_status_by_id(bridge_digest);
+ if (!(*dl_to_emit)) {
+ *errmsg = "No such bridge identity digest found";
+ }
+ } else {
+ *errmsg = "That didn't look like a digest";
+ }
+ } else {
+ *errmsg = "Unknown bridge descriptor download status query";
+ }
+}
+
+/** Implementation helper for GETINFO: knows the answers for questions about
+ * download status information. */
+STATIC int
+getinfo_helper_downloads(control_connection_t *control_conn,
+ const char *question, char **answer,
+ const char **errmsg)
+{
+ download_status_t *dl_to_emit = NULL;
+ smartlist_t *digest_list = NULL;
+
+ /* Assert args are sane */
+ tor_assert(control_conn != NULL);
+ tor_assert(question != NULL);
+ tor_assert(answer != NULL);
+ tor_assert(errmsg != NULL);
+
+ /* We check for this later to see if we should supply a default */
+ *errmsg = NULL;
+
+ /* Are we after networkstatus downloads? */
+ if (!strcmpstart(question, "downloads/networkstatus/")) {
+ getinfo_helper_downloads_networkstatus(
+ question + strlen("downloads/networkstatus/"),
+ &dl_to_emit, errmsg);
+ /* Certificates? */
+ } else if (!strcmpstart(question, "downloads/cert/")) {
+ getinfo_helper_downloads_cert(
+ question + strlen("downloads/cert/"),
+ &dl_to_emit, &digest_list, errmsg);
+ /* Router descriptors? */
+ } else if (!strcmpstart(question, "downloads/desc/")) {
+ getinfo_helper_downloads_desc(
+ question + strlen("downloads/desc/"),
+ &dl_to_emit, &digest_list, errmsg);
+ /* Bridge descriptors? */
+ } else if (!strcmpstart(question, "downloads/bridge/")) {
+ getinfo_helper_downloads_bridge(
+ question + strlen("downloads/bridge/"),
+ &dl_to_emit, &digest_list, errmsg);
+ } else {
+ *errmsg = "Unknown download status query";
+ }
+
+ if (dl_to_emit) {
+ *answer = download_status_to_string(dl_to_emit);
+
+ return 0;
+ } else if (digest_list) {
+ *answer = digest_list_to_string(digest_list);
+ SMARTLIST_FOREACH(digest_list, void *, s, tor_free(s));
+ smartlist_free(digest_list);
+
+ return 0;
+ } else {
+ if (!(*errmsg)) {
+ *errmsg = "Unknown error";
+ }
+
+ return -1;
+ }
+}
+
+/** Allocate and return a description of <b>circ</b>'s current status,
+ * including its path (if any). */
+static char *
+circuit_describe_status_for_controller(origin_circuit_t *circ)
+{
+ char *rv;
+ smartlist_t *descparts = smartlist_new();
+
+ {
+ char *vpath = circuit_list_path_for_controller(circ);
+ if (*vpath) {
+ smartlist_add(descparts, vpath);
+ } else {
+ tor_free(vpath); /* empty path; don't put an extra space in the result */
+ }
+ }
+
+ {
+ cpath_build_state_t *build_state = circ->build_state;
+ smartlist_t *flaglist = smartlist_new();
+ char *flaglist_joined;
+
+ if (build_state->onehop_tunnel)
+ smartlist_add(flaglist, (void *)"ONEHOP_TUNNEL");
+ if (build_state->is_internal)
+ smartlist_add(flaglist, (void *)"IS_INTERNAL");
+ if (build_state->need_capacity)
+ smartlist_add(flaglist, (void *)"NEED_CAPACITY");
+ if (build_state->need_uptime)
+ smartlist_add(flaglist, (void *)"NEED_UPTIME");
+
+ /* Only emit a BUILD_FLAGS argument if it will have a non-empty value. */
+ if (smartlist_len(flaglist)) {
+ flaglist_joined = smartlist_join_strings(flaglist, ",", 0, NULL);
+
+ smartlist_add_asprintf(descparts, "BUILD_FLAGS=%s", flaglist_joined);
+
+ tor_free(flaglist_joined);
+ }
+
+ smartlist_free(flaglist);
+ }
+
+ smartlist_add_asprintf(descparts, "PURPOSE=%s",
+ circuit_purpose_to_controller_string(circ->base_.purpose));
+
+ {
+ const char *hs_state =
+ circuit_purpose_to_controller_hs_state_string(circ->base_.purpose);
+
+ if (hs_state != NULL) {
+ smartlist_add_asprintf(descparts, "HS_STATE=%s", hs_state);
+ }
+ }
+
+ if (circ->rend_data != NULL || circ->hs_ident != NULL) {
+ char addr[HS_SERVICE_ADDR_LEN_BASE32 + 1];
+ const char *onion_address;
+ if (circ->rend_data) {
+ onion_address = rend_data_get_address(circ->rend_data);
+ } else {
+ hs_build_address(&circ->hs_ident->identity_pk, HS_VERSION_THREE, addr);
+ onion_address = addr;
+ }
+ smartlist_add_asprintf(descparts, "REND_QUERY=%s", onion_address);
+ }
+
+ {
+ char tbuf[ISO_TIME_USEC_LEN+1];
+ format_iso_time_nospace_usec(tbuf, &circ->base_.timestamp_created);
+
+ smartlist_add_asprintf(descparts, "TIME_CREATED=%s", tbuf);
+ }
+
+ // Show username and/or password if available.
+ if (circ->socks_username_len > 0) {
+ char* socks_username_escaped = esc_for_log_len(circ->socks_username,
+ (size_t) circ->socks_username_len);
+ smartlist_add_asprintf(descparts, "SOCKS_USERNAME=%s",
+ socks_username_escaped);
+ tor_free(socks_username_escaped);
+ }
+ if (circ->socks_password_len > 0) {
+ char* socks_password_escaped = esc_for_log_len(circ->socks_password,
+ (size_t) circ->socks_password_len);
+ smartlist_add_asprintf(descparts, "SOCKS_PASSWORD=%s",
+ socks_password_escaped);
+ tor_free(socks_password_escaped);
+ }
+
+ rv = smartlist_join_strings(descparts, " ", 0, NULL);
+
+ SMARTLIST_FOREACH(descparts, char *, cp, tor_free(cp));
+ smartlist_free(descparts);
+
+ return rv;
+}
+
+/** Implementation helper for GETINFO: knows how to generate summaries of the
+ * current states of things we send events about. */
+static int
+getinfo_helper_events(control_connection_t *control_conn,
+ const char *question, char **answer,
+ const char **errmsg)
+{
+ const or_options_t *options = get_options();
+ (void) control_conn;
+ if (!strcmp(question, "circuit-status")) {
+ smartlist_t *status = smartlist_new();
+ SMARTLIST_FOREACH_BEGIN(circuit_get_global_list(), circuit_t *, circ_) {
+ origin_circuit_t *circ;
+ char *circdesc;
+ const char *state;
+ if (! CIRCUIT_IS_ORIGIN(circ_) || circ_->marked_for_close)
+ continue;
+ circ = TO_ORIGIN_CIRCUIT(circ_);
+
+ if (circ->base_.state == CIRCUIT_STATE_OPEN)
+ state = "BUILT";
+ else if (circ->base_.state == CIRCUIT_STATE_GUARD_WAIT)
+ state = "GUARD_WAIT";
+ else if (circ->cpath)
+ state = "EXTENDED";
+ else
+ state = "LAUNCHED";
+
+ circdesc = circuit_describe_status_for_controller(circ);
+
+ smartlist_add_asprintf(status, "%lu %s%s%s",
+ (unsigned long)circ->global_identifier,
+ state, *circdesc ? " " : "", circdesc);
+ tor_free(circdesc);
+ }
+ SMARTLIST_FOREACH_END(circ_);
+ *answer = smartlist_join_strings(status, "\r\n", 0, NULL);
+ SMARTLIST_FOREACH(status, char *, cp, tor_free(cp));
+ smartlist_free(status);
+ } else if (!strcmp(question, "stream-status")) {
+ smartlist_t *conns = get_connection_array();
+ smartlist_t *status = smartlist_new();
+ char buf[256];
+ SMARTLIST_FOREACH_BEGIN(conns, connection_t *, base_conn) {
+ const char *state;
+ entry_connection_t *conn;
+ circuit_t *circ;
+ origin_circuit_t *origin_circ = NULL;
+ if (base_conn->type != CONN_TYPE_AP ||
+ base_conn->marked_for_close ||
+ base_conn->state == AP_CONN_STATE_SOCKS_WAIT ||
+ base_conn->state == AP_CONN_STATE_NATD_WAIT)
+ continue;
+ conn = TO_ENTRY_CONN(base_conn);
+ switch (base_conn->state)
+ {
+ case AP_CONN_STATE_CONTROLLER_WAIT:
+ case AP_CONN_STATE_CIRCUIT_WAIT:
+ if (conn->socks_request &&
+ SOCKS_COMMAND_IS_RESOLVE(conn->socks_request->command))
+ state = "NEWRESOLVE";
+ else
+ state = "NEW";
+ break;
+ case AP_CONN_STATE_RENDDESC_WAIT:
+ case AP_CONN_STATE_CONNECT_WAIT:
+ state = "SENTCONNECT"; break;
+ case AP_CONN_STATE_RESOLVE_WAIT:
+ state = "SENTRESOLVE"; break;
+ case AP_CONN_STATE_OPEN:
+ state = "SUCCEEDED"; break;
+ default:
+ log_warn(LD_BUG, "Asked for stream in unknown state %d",
+ base_conn->state);
+ continue;
+ }
+ circ = circuit_get_by_edge_conn(ENTRY_TO_EDGE_CONN(conn));
+ if (circ && CIRCUIT_IS_ORIGIN(circ))
+ origin_circ = TO_ORIGIN_CIRCUIT(circ);
+ write_stream_target_to_buf(conn, buf, sizeof(buf));
+ smartlist_add_asprintf(status, "%lu %s %lu %s",
+ (unsigned long) base_conn->global_identifier,state,
+ origin_circ?
+ (unsigned long)origin_circ->global_identifier : 0ul,
+ buf);
+ } SMARTLIST_FOREACH_END(base_conn);
+ *answer = smartlist_join_strings(status, "\r\n", 0, NULL);
+ SMARTLIST_FOREACH(status, char *, cp, tor_free(cp));
+ smartlist_free(status);
+ } else if (!strcmp(question, "orconn-status")) {
+ smartlist_t *conns = get_connection_array();
+ smartlist_t *status = smartlist_new();
+ SMARTLIST_FOREACH_BEGIN(conns, connection_t *, base_conn) {
+ const char *state;
+ char name[128];
+ or_connection_t *conn;
+ if (base_conn->type != CONN_TYPE_OR || base_conn->marked_for_close)
+ continue;
+ conn = TO_OR_CONN(base_conn);
+ if (conn->base_.state == OR_CONN_STATE_OPEN)
+ state = "CONNECTED";
+ else if (conn->nickname)
+ state = "LAUNCHED";
+ else
+ state = "NEW";
+ orconn_target_get_name(name, sizeof(name), conn);
+ smartlist_add_asprintf(status, "%s %s", name, state);
+ } SMARTLIST_FOREACH_END(base_conn);
+ *answer = smartlist_join_strings(status, "\r\n", 0, NULL);
+ SMARTLIST_FOREACH(status, char *, cp, tor_free(cp));
+ smartlist_free(status);
+ } else if (!strcmpstart(question, "address-mappings/")) {
+ time_t min_e, max_e;
+ smartlist_t *mappings;
+ question += strlen("address-mappings/");
+ if (!strcmp(question, "all")) {
+ min_e = 0; max_e = TIME_MAX;
+ } else if (!strcmp(question, "cache")) {
+ min_e = 2; max_e = TIME_MAX;
+ } else if (!strcmp(question, "config")) {
+ min_e = 0; max_e = 0;
+ } else if (!strcmp(question, "control")) {
+ min_e = 1; max_e = 1;
+ } else {
+ return 0;
+ }
+ mappings = smartlist_new();
+ addressmap_get_mappings(mappings, min_e, max_e, 1);
+ *answer = smartlist_join_strings(mappings, "\r\n", 0, NULL);
+ SMARTLIST_FOREACH(mappings, char *, cp, tor_free(cp));
+ smartlist_free(mappings);
+ } else if (!strcmpstart(question, "status/")) {
+ /* Note that status/ is not a catch-all for events; there's only supposed
+ * to be a status GETINFO if there's a corresponding STATUS event. */
+ if (!strcmp(question, "status/circuit-established")) {
+ *answer = tor_strdup(have_completed_a_circuit() ? "1" : "0");
+ } else if (!strcmp(question, "status/enough-dir-info")) {
+ *answer = tor_strdup(router_have_minimum_dir_info() ? "1" : "0");
+ } else if (!strcmp(question, "status/good-server-descriptor") ||
+ !strcmp(question, "status/accepted-server-descriptor")) {
+ /* They're equivalent for now, until we can figure out how to make
+ * good-server-descriptor be what we want. See comment in
+ * control-spec.txt. */
+ *answer = tor_strdup(directories_have_accepted_server_descriptor()
+ ? "1" : "0");
+ } else if (!strcmp(question, "status/reachability-succeeded/or")) {
+ *answer = tor_strdup(check_whether_orport_reachable(options) ?
+ "1" : "0");
+ } else if (!strcmp(question, "status/reachability-succeeded/dir")) {
+ *answer = tor_strdup(check_whether_dirport_reachable(options) ?
+ "1" : "0");
+ } else if (!strcmp(question, "status/reachability-succeeded")) {
+ tor_asprintf(answer, "OR=%d DIR=%d",
+ check_whether_orport_reachable(options) ? 1 : 0,
+ check_whether_dirport_reachable(options) ? 1 : 0);
+ } else if (!strcmp(question, "status/bootstrap-phase")) {
+ *answer = tor_strdup(last_sent_bootstrap_message);
+ } else if (!strcmpstart(question, "status/version/")) {
+ int is_server = server_mode(options);
+ networkstatus_t *c = networkstatus_get_latest_consensus();
+ version_status_t status;
+ const char *recommended;
+ if (c) {
+ recommended = is_server ? c->server_versions : c->client_versions;
+ status = tor_version_is_obsolete(VERSION, recommended);
+ } else {
+ recommended = "?";
+ status = VS_UNKNOWN;
+ }
+
+ if (!strcmp(question, "status/version/recommended")) {
+ *answer = tor_strdup(recommended);
+ return 0;
+ }
+ if (!strcmp(question, "status/version/current")) {
+ switch (status)
+ {
+ case VS_RECOMMENDED: *answer = tor_strdup("recommended"); break;
+ case VS_OLD: *answer = tor_strdup("obsolete"); break;
+ case VS_NEW: *answer = tor_strdup("new"); break;
+ case VS_NEW_IN_SERIES: *answer = tor_strdup("new in series"); break;
+ case VS_UNRECOMMENDED: *answer = tor_strdup("unrecommended"); break;
+ case VS_EMPTY: *answer = tor_strdup("none recommended"); break;
+ case VS_UNKNOWN: *answer = tor_strdup("unknown"); break;
+ default: tor_fragile_assert();
+ }
+ } else if (!strcmp(question, "status/version/num-versioning") ||
+ !strcmp(question, "status/version/num-concurring")) {
+ tor_asprintf(answer, "%d", get_n_authorities(V3_DIRINFO));
+ log_warn(LD_GENERAL, "%s is deprecated; it no longer gives useful "
+ "information", question);
+ }
+ } else if (!strcmp(question, "status/clients-seen")) {
+ char *bridge_stats = geoip_get_bridge_stats_controller(time(NULL));
+ if (!bridge_stats) {
+ *errmsg = "No bridge-client stats available";
+ return -1;
+ }
+ *answer = bridge_stats;
+ } else if (!strcmp(question, "status/fresh-relay-descs")) {
+ if (!server_mode(options)) {
+ *errmsg = "Only relays have descriptors";
+ return -1;
+ }
+ routerinfo_t *r;
+ extrainfo_t *e;
+ if (router_build_fresh_descriptor(&r, &e) < 0) {
+ *errmsg = "Error generating descriptor";
+ return -1;
+ }
+ size_t size = r->cache_info.signed_descriptor_len + 1;
+ if (e) {
+ size += e->cache_info.signed_descriptor_len + 1;
+ }
+ tor_assert(r->cache_info.signed_descriptor_len);
+ char *descs = tor_malloc(size);
+ char *cp = descs;
+ memcpy(cp, signed_descriptor_get_body(&r->cache_info),
+ r->cache_info.signed_descriptor_len);
+ cp += r->cache_info.signed_descriptor_len - 1;
+ if (e) {
+ if (cp[0] == '\0') {
+ cp[0] = '\n';
+ } else if (cp[0] != '\n') {
+ cp[1] = '\n';
+ cp++;
+ }
+ memcpy(cp, signed_descriptor_get_body(&e->cache_info),
+ e->cache_info.signed_descriptor_len);
+ cp += e->cache_info.signed_descriptor_len - 1;
+ }
+ if (cp[0] == '\n') {
+ cp[0] = '\0';
+ } else if (cp[0] != '\0') {
+ cp[1] = '\0';
+ }
+ *answer = descs;
+ routerinfo_free(r);
+ extrainfo_free(e);
+ } else {
+ return 0;
+ }
+ }
+ return 0;
+}
+
+/** Implementation helper for GETINFO: knows how to enumerate hidden services
+ * created via the control port. */
+STATIC int
+getinfo_helper_onions(control_connection_t *control_conn,
+ const char *question, char **answer,
+ const char **errmsg)
+{
+ smartlist_t *onion_list = NULL;
+ (void) errmsg; /* no errors from this method */
+
+ if (control_conn && !strcmp(question, "onions/current")) {
+ onion_list = control_conn->ephemeral_onion_services;
+ } else if (!strcmp(question, "onions/detached")) {
+ onion_list = detached_onion_services;
+ } else {
+ return 0;
+ }
+ if (!onion_list || smartlist_len(onion_list) == 0) {
+ if (answer) {
+ *answer = tor_strdup("");
+ }
+ } else {
+ if (answer) {
+ *answer = smartlist_join_strings(onion_list, "\r\n", 0, NULL);
+ }
+ }
+
+ return 0;
+}
+
+/** Implementation helper for GETINFO: answers queries about network
+ * liveness. */
+static int
+getinfo_helper_liveness(control_connection_t *control_conn,
+ const char *question, char **answer,
+ const char **errmsg)
+{
+ (void)control_conn;
+ (void)errmsg;
+ if (strcmp(question, "network-liveness") == 0) {
+ if (get_cached_network_liveness()) {
+ *answer = tor_strdup("up");
+ } else {
+ *answer = tor_strdup("down");
+ }
+ }
+
+ return 0;
+}
+
+/** Implementation helper for GETINFO: answers queries about shared random
+ * value. */
+static int
+getinfo_helper_sr(control_connection_t *control_conn,
+ const char *question, char **answer,
+ const char **errmsg)
+{
+ (void) control_conn;
+ (void) errmsg;
+
+ if (!strcmp(question, "sr/current")) {
+ *answer = sr_get_current_for_control();
+ } else if (!strcmp(question, "sr/previous")) {
+ *answer = sr_get_previous_for_control();
+ }
+ /* Else statement here is unrecognized key so do nothing. */
+
+ return 0;
+}
+
+/** Callback function for GETINFO: on a given control connection, try to
+ * answer the question <b>q</b> and store the newly-allocated answer in
+ * *<b>a</b>. If an internal error occurs, return -1 and optionally set
+ * *<b>error_out</b> to point to an error message to be delivered to the
+ * controller. On success, _or if the key is not recognized_, return 0. Do not
+ * set <b>a</b> if the key is not recognized but you may set <b>error_out</b>
+ * to improve the error message.
+ */
+typedef int (*getinfo_helper_t)(control_connection_t *,
+ const char *q, char **a,
+ const char **error_out);
+
+/** A single item for the GETINFO question-to-answer-function table. */
+typedef struct getinfo_item_t {
+ const char *varname; /**< The value (or prefix) of the question. */
+ getinfo_helper_t fn; /**< The function that knows the answer: NULL if
+ * this entry is documentation-only. */
+ const char *desc; /**< Description of the variable. */
+ int is_prefix; /** Must varname match exactly, or must it be a prefix? */
+} getinfo_item_t;
+
+#define ITEM(name, fn, desc) { name, getinfo_helper_##fn, desc, 0 }
+#define PREFIX(name, fn, desc) { name, getinfo_helper_##fn, desc, 1 }
+#define DOC(name, desc) { name, NULL, desc, 0 }
+
+/** Table mapping questions accepted by GETINFO to the functions that know how
+ * to answer them. */
+static const getinfo_item_t getinfo_items[] = {
+ ITEM("version", misc, "The current version of Tor."),
+ ITEM("bw-event-cache", misc, "Cached BW events for a short interval."),
+ ITEM("config-file", misc, "Current location of the \"torrc\" file."),
+ ITEM("config-defaults-file", misc, "Current location of the defaults file."),
+ ITEM("config-text", misc,
+ "Return the string that would be written by a saveconf command."),
+ ITEM("config-can-saveconf", misc,
+ "Is it possible to save the configuration to the \"torrc\" file?"),
+ ITEM("accounting/bytes", accounting,
+ "Number of bytes read/written so far in the accounting interval."),
+ ITEM("accounting/bytes-left", accounting,
+ "Number of bytes left to write/read so far in the accounting interval."),
+ ITEM("accounting/enabled", accounting, "Is accounting currently enabled?"),
+ ITEM("accounting/hibernating", accounting, "Are we hibernating or awake?"),
+ ITEM("accounting/interval-start", accounting,
+ "Time when the accounting period starts."),
+ ITEM("accounting/interval-end", accounting,
+ "Time when the accounting period ends."),
+ ITEM("accounting/interval-wake", accounting,
+ "Time to wake up in this accounting period."),
+ ITEM("helper-nodes", entry_guards, NULL), /* deprecated */
+ ITEM("entry-guards", entry_guards,
+ "Which nodes are we using as entry guards?"),
+ ITEM("fingerprint", misc, NULL),
+ PREFIX("config/", config, "Current configuration values."),
+ DOC("config/names",
+ "List of configuration options, types, and documentation."),
+ DOC("config/defaults",
+ "List of default values for configuration options. "
+ "See also config/names"),
+ PREFIX("current-time/", current_time, "Current time."),
+ DOC("current-time/local", "Current time on the local system."),
+ DOC("current-time/utc", "Current UTC time."),
+ PREFIX("downloads/networkstatus/", downloads,
+ "Download statuses for networkstatus objects"),
+ DOC("downloads/networkstatus/ns",
+ "Download status for current-mode networkstatus download"),
+ DOC("downloads/networkstatus/ns/bootstrap",
+ "Download status for bootstrap-time networkstatus download"),
+ DOC("downloads/networkstatus/ns/running",
+ "Download status for run-time networkstatus download"),
+ DOC("downloads/networkstatus/microdesc",
+ "Download status for current-mode microdesc download"),
+ DOC("downloads/networkstatus/microdesc/bootstrap",
+ "Download status for bootstrap-time microdesc download"),
+ DOC("downloads/networkstatus/microdesc/running",
+ "Download status for run-time microdesc download"),
+ PREFIX("downloads/cert/", downloads,
+ "Download statuses for certificates, by id fingerprint and "
+ "signing key"),
+ DOC("downloads/cert/fps",
+ "List of authority fingerprints for which any download statuses "
+ "exist"),
+ DOC("downloads/cert/fp/<fp>",
+ "Download status for <fp> with the default signing key; corresponds "
+ "to /fp/ URLs on directory server."),
+ DOC("downloads/cert/fp/<fp>/sks",
+ "List of signing keys for which specific download statuses are "
+ "available for this id fingerprint"),
+ DOC("downloads/cert/fp/<fp>/<sk>",
+ "Download status for <fp> with signing key <sk>; corresponds "
+ "to /fp-sk/ URLs on directory server."),
+ PREFIX("downloads/desc/", downloads,
+ "Download statuses for router descriptors, by descriptor digest"),
+ DOC("downloads/desc/descs",
+ "Return a list of known router descriptor digests"),
+ DOC("downloads/desc/<desc>",
+ "Return a download status for a given descriptor digest"),
+ PREFIX("downloads/bridge/", downloads,
+ "Download statuses for bridge descriptors, by bridge identity "
+ "digest"),
+ DOC("downloads/bridge/bridges",
+ "Return a list of configured bridge identity digests with download "
+ "statuses"),
+ DOC("downloads/bridge/<desc>",
+ "Return a download status for a given bridge identity digest"),
+ ITEM("info/names", misc,
+ "List of GETINFO options, types, and documentation."),
+ ITEM("events/names", misc,
+ "Events that the controller can ask for with SETEVENTS."),
+ ITEM("signal/names", misc, "Signal names recognized by the SIGNAL command"),
+ ITEM("features/names", misc, "What arguments can USEFEATURE take?"),
+ PREFIX("desc/id/", dir, "Router descriptors by ID."),
+ PREFIX("desc/name/", dir, "Router descriptors by nickname."),
+ ITEM("desc/all-recent", dir,
+ "All non-expired, non-superseded router descriptors."),
+ ITEM("desc/download-enabled", dir,
+ "Do we try to download router descriptors?"),
+ ITEM("desc/all-recent-extrainfo-hack", dir, NULL), /* Hack. */
+ ITEM("md/all", dir, "All known microdescriptors."),
+ PREFIX("md/id/", dir, "Microdescriptors by ID"),
+ PREFIX("md/name/", dir, "Microdescriptors by name"),
+ ITEM("md/download-enabled", dir,
+ "Do we try to download microdescriptors?"),
+ PREFIX("extra-info/digest/", dir, "Extra-info documents by digest."),
+ PREFIX("hs/client/desc/id", dir,
+ "Hidden Service descriptor in client's cache by onion."),
+ PREFIX("hs/service/desc/id/", dir,
+ "Hidden Service descriptor in services's cache by onion."),
+ PREFIX("net/listeners/", listeners, "Bound addresses by type"),
+ ITEM("ns/all", networkstatus,
+ "Brief summary of router status (v2 directory format)"),
+ PREFIX("ns/id/", networkstatus,
+ "Brief summary of router status by ID (v2 directory format)."),
+ PREFIX("ns/name/", networkstatus,
+ "Brief summary of router status by nickname (v2 directory format)."),
+ PREFIX("ns/purpose/", networkstatus,
+ "Brief summary of router status by purpose (v2 directory format)."),
+ PREFIX("consensus/", networkstatus,
+ "Information about and from the ns consensus."),
+ ITEM("network-status", dir,
+ "Brief summary of router status (v1 directory format)"),
+ ITEM("network-liveness", liveness,
+ "Current opinion on whether the network is live"),
+ ITEM("circuit-status", events, "List of current circuits originating here."),
+ ITEM("stream-status", events,"List of current streams."),
+ ITEM("orconn-status", events, "A list of current OR connections."),
+ ITEM("dormant", misc,
+ "Is Tor dormant (not building circuits because it's idle)?"),
+ PREFIX("address-mappings/", events, NULL),
+ DOC("address-mappings/all", "Current address mappings."),
+ DOC("address-mappings/cache", "Current cached DNS replies."),
+ DOC("address-mappings/config",
+ "Current address mappings from configuration."),
+ DOC("address-mappings/control", "Current address mappings from controller."),
+ PREFIX("status/", events, NULL),
+ DOC("status/circuit-established",
+ "Whether we think client functionality is working."),
+ DOC("status/enough-dir-info",
+ "Whether we have enough up-to-date directory information to build "
+ "circuits."),
+ DOC("status/bootstrap-phase",
+ "The last bootstrap phase status event that Tor sent."),
+ DOC("status/clients-seen",
+ "Breakdown of client countries seen by a bridge."),
+ DOC("status/fresh-relay-descs",
+ "A fresh relay/ei descriptor pair for Tor's current state. Not stored."),
+ DOC("status/version/recommended", "List of currently recommended versions."),
+ DOC("status/version/current", "Status of the current version."),
+ DOC("status/version/num-versioning", "Number of versioning authorities."),
+ DOC("status/version/num-concurring",
+ "Number of versioning authorities agreeing on the status of the "
+ "current version"),
+ ITEM("address", misc, "IP address of this Tor host, if we can guess it."),
+ ITEM("traffic/read", misc,"Bytes read since the process was started."),
+ ITEM("traffic/written", misc,
+ "Bytes written since the process was started."),
+ ITEM("process/pid", misc, "Process id belonging to the main tor process."),
+ ITEM("process/uid", misc, "User id running the tor process."),
+ ITEM("process/user", misc,
+ "Username under which the tor process is running."),
+ ITEM("process/descriptor-limit", misc, "File descriptor limit."),
+ ITEM("limits/max-mem-in-queues", misc, "Actual limit on memory in queues"),
+ PREFIX("desc-annotations/id/", dir, "Router annotations by hexdigest."),
+ PREFIX("dir/server/", dir,"Router descriptors as retrieved from a DirPort."),
+ PREFIX("dir/status/", dir,
+ "v2 networkstatus docs as retrieved from a DirPort."),
+ ITEM("dir/status-vote/current/consensus", dir,
+ "v3 Networkstatus consensus as retrieved from a DirPort."),
+ ITEM("exit-policy/default", policies,
+ "The default value appended to the configured exit policy."),
+ ITEM("exit-policy/reject-private/default", policies,
+ "The default rules appended to the configured exit policy by"
+ " ExitPolicyRejectPrivate."),
+ ITEM("exit-policy/reject-private/relay", policies,
+ "The relay-specific rules appended to the configured exit policy by"
+ " ExitPolicyRejectPrivate and/or ExitPolicyRejectLocalInterfaces."),
+ ITEM("exit-policy/full", policies, "The entire exit policy of onion router"),
+ ITEM("exit-policy/ipv4", policies, "IPv4 parts of exit policy"),
+ ITEM("exit-policy/ipv6", policies, "IPv6 parts of exit policy"),
+ PREFIX("ip-to-country/", geoip, "Perform a GEOIP lookup"),
+ ITEM("onions/current", onions,
+ "Onion services owned by the current control connection."),
+ ITEM("onions/detached", onions,
+ "Onion services detached from the control connection."),
+ ITEM("sr/current", sr, "Get current shared random value."),
+ ITEM("sr/previous", sr, "Get previous shared random value."),
+ { NULL, NULL, NULL, 0 }
+};
+
+/** Allocate and return a list of recognized GETINFO options. */
+static char *
+list_getinfo_options(void)
+{
+ int i;
+ smartlist_t *lines = smartlist_new();
+ char *ans;
+ for (i = 0; getinfo_items[i].varname; ++i) {
+ if (!getinfo_items[i].desc)
+ continue;
+
+ smartlist_add_asprintf(lines, "%s%s -- %s\n",
+ getinfo_items[i].varname,
+ getinfo_items[i].is_prefix ? "*" : "",
+ getinfo_items[i].desc);
+ }
+ smartlist_sort_strings(lines);
+
+ ans = smartlist_join_strings(lines, "", 0, NULL);
+ SMARTLIST_FOREACH(lines, char *, cp, tor_free(cp));
+ smartlist_free(lines);
+
+ return ans;
+}
+
+/** Lookup the 'getinfo' entry <b>question</b>, and return
+ * the answer in <b>*answer</b> (or NULL if key not recognized).
+ * Return 0 if success or unrecognized, or -1 if recognized but
+ * internal error. */
+static int
+handle_getinfo_helper(control_connection_t *control_conn,
+ const char *question, char **answer,
+ const char **err_out)
+{
+ int i;
+ *answer = NULL; /* unrecognized key by default */
+
+ for (i = 0; getinfo_items[i].varname; ++i) {
+ int match;
+ if (getinfo_items[i].is_prefix)
+ match = !strcmpstart(question, getinfo_items[i].varname);
+ else
+ match = !strcmp(question, getinfo_items[i].varname);
+ if (match) {
+ tor_assert(getinfo_items[i].fn);
+ return getinfo_items[i].fn(control_conn, question, answer, err_out);
+ }
+ }
+
+ return 0; /* unrecognized */
+}
+
+/** Called when we receive a GETINFO command. Try to fetch all requested
+ * information, and reply with information or error message. */
+static int
+handle_control_getinfo(control_connection_t *conn, uint32_t len,
+ const char *body)
+{
+ smartlist_t *questions = smartlist_new();
+ smartlist_t *answers = smartlist_new();
+ smartlist_t *unrecognized = smartlist_new();
+ char *ans = NULL;
+ int i;
+ (void) len; /* body is NUL-terminated, so it's safe to ignore the length. */
+
+ smartlist_split_string(questions, body, " ",
+ SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, 0);
+ SMARTLIST_FOREACH_BEGIN(questions, const char *, q) {
+ const char *errmsg = NULL;
+
+ if (handle_getinfo_helper(conn, q, &ans, &errmsg) < 0) {
+ if (!errmsg)
+ errmsg = "Internal error";
+ connection_printf_to_buf(conn, "551 %s\r\n", errmsg);
+ goto done;
+ }
+ if (!ans) {
+ if (errmsg) /* use provided error message */
+ smartlist_add_strdup(unrecognized, errmsg);
+ else /* use default error message */
+ smartlist_add_asprintf(unrecognized, "Unrecognized key \"%s\"", q);
+ } else {
+ smartlist_add_strdup(answers, q);
+ smartlist_add(answers, ans);
+ }
+ } SMARTLIST_FOREACH_END(q);
+
+ if (smartlist_len(unrecognized)) {
+ /* control-spec section 2.3, mid-reply '-' or end of reply ' ' */
+ for (i=0; i < smartlist_len(unrecognized)-1; ++i)
+ connection_printf_to_buf(conn,
+ "552-%s\r\n",
+ (char *)smartlist_get(unrecognized, i));
+
+ connection_printf_to_buf(conn,
+ "552 %s\r\n",
+ (char *)smartlist_get(unrecognized, i));
+ goto done;
+ }
+
+ for (i = 0; i < smartlist_len(answers); i += 2) {
+ char *k = smartlist_get(answers, i);
+ char *v = smartlist_get(answers, i+1);
+ if (!strchr(v, '\n') && !strchr(v, '\r')) {
+ connection_printf_to_buf(conn, "250-%s=", k);
+ connection_write_str_to_buf(v, conn);
+ connection_write_str_to_buf("\r\n", conn);
+ } else {
+ char *esc = NULL;
+ size_t esc_len;
+ esc_len = write_escaped_data(v, strlen(v), &esc);
+ connection_printf_to_buf(conn, "250+%s=\r\n", k);
+ connection_buf_add(esc, esc_len, TO_CONN(conn));
+ tor_free(esc);
+ }
+ }
+ connection_write_str_to_buf("250 OK\r\n", conn);
+
+ done:
+ SMARTLIST_FOREACH(answers, char *, cp, tor_free(cp));
+ smartlist_free(answers);
+ SMARTLIST_FOREACH(questions, char *, cp, tor_free(cp));
+ smartlist_free(questions);
+ SMARTLIST_FOREACH(unrecognized, char *, cp, tor_free(cp));
+ smartlist_free(unrecognized);
+
+ return 0;
+}
+
+/** Given a string, convert it to a circuit purpose. */
+static uint8_t
+circuit_purpose_from_string(const char *string)
+{
+ if (!strcasecmpstart(string, "purpose="))
+ string += strlen("purpose=");
+
+ if (!strcasecmp(string, "general"))
+ return CIRCUIT_PURPOSE_C_GENERAL;
+ else if (!strcasecmp(string, "controller"))
+ return CIRCUIT_PURPOSE_CONTROLLER;
+ else
+ return CIRCUIT_PURPOSE_UNKNOWN;
+}
+
+/** Return a newly allocated smartlist containing the arguments to the command
+ * waiting in <b>body</b>. If there are fewer than <b>min_args</b> arguments,
+ * or if <b>max_args</b> is nonnegative and there are more than
+ * <b>max_args</b> arguments, send a 512 error to the controller, using
+ * <b>command</b> as the command name in the error message. */
+static smartlist_t *
+getargs_helper(const char *command, control_connection_t *conn,
+ const char *body, int min_args, int max_args)
+{
+ smartlist_t *args = smartlist_new();
+ smartlist_split_string(args, body, " ",
+ SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, 0);
+ if (smartlist_len(args) < min_args) {
+ connection_printf_to_buf(conn, "512 Missing argument to %s\r\n",command);
+ goto err;
+ } else if (max_args >= 0 && smartlist_len(args) > max_args) {
+ connection_printf_to_buf(conn, "512 Too many arguments to %s\r\n",command);
+ goto err;
+ }
+ return args;
+ err:
+ SMARTLIST_FOREACH(args, char *, s, tor_free(s));
+ smartlist_free(args);
+ return NULL;
+}
+
+/** Helper. Return the first element of <b>sl</b> at index <b>start_at</b> or
+ * higher that starts with <b>prefix</b>, case-insensitive. Return NULL if no
+ * such element exists. */
+static const char *
+find_element_starting_with(smartlist_t *sl, int start_at, const char *prefix)
+{
+ int i;
+ for (i = start_at; i < smartlist_len(sl); ++i) {
+ const char *elt = smartlist_get(sl, i);
+ if (!strcasecmpstart(elt, prefix))
+ return elt;
+ }
+ return NULL;
+}
+
+/** Helper. Return true iff s is an argument that we should treat as a
+ * key-value pair. */
+static int
+is_keyval_pair(const char *s)
+{
+ /* An argument is a key-value pair if it has an =, and it isn't of the form
+ * $fingeprint=name */
+ return strchr(s, '=') && s[0] != '$';
+}
+
+/** Called when we get an EXTENDCIRCUIT message. Try to extend the listed
+ * circuit, and report success or failure. */
+static int
+handle_control_extendcircuit(control_connection_t *conn, uint32_t len,
+ const char *body)
+{
+ smartlist_t *router_nicknames=NULL, *nodes=NULL;
+ origin_circuit_t *circ = NULL;
+ int zero_circ;
+ uint8_t intended_purpose = CIRCUIT_PURPOSE_C_GENERAL;
+ smartlist_t *args;
+ (void) len;
+
+ router_nicknames = smartlist_new();
+
+ args = getargs_helper("EXTENDCIRCUIT", conn, body, 1, -1);
+ if (!args)
+ goto done;
+
+ zero_circ = !strcmp("0", (char*)smartlist_get(args,0));
+
+ if (zero_circ) {
+ const char *purp = find_element_starting_with(args, 1, "PURPOSE=");
+
+ if (purp) {
+ intended_purpose = circuit_purpose_from_string(purp);
+ if (intended_purpose == CIRCUIT_PURPOSE_UNKNOWN) {
+ connection_printf_to_buf(conn, "552 Unknown purpose \"%s\"\r\n", purp);
+ SMARTLIST_FOREACH(args, char *, cp, tor_free(cp));
+ smartlist_free(args);
+ goto done;
+ }
+ }
+
+ if ((smartlist_len(args) == 1) ||
+ (smartlist_len(args) >= 2 && is_keyval_pair(smartlist_get(args, 1)))) {
+ // "EXTENDCIRCUIT 0" || EXTENDCIRCUIT 0 foo=bar"
+ circ = circuit_launch(intended_purpose, CIRCLAUNCH_NEED_CAPACITY);
+ if (!circ) {
+ connection_write_str_to_buf("551 Couldn't start circuit\r\n", conn);
+ } else {
+ connection_printf_to_buf(conn, "250 EXTENDED %lu\r\n",
+ (unsigned long)circ->global_identifier);
+ }
+ SMARTLIST_FOREACH(args, char *, cp, tor_free(cp));
+ smartlist_free(args);
+ goto done;
+ }
+ // "EXTENDCIRCUIT 0 router1,router2" ||
+ // "EXTENDCIRCUIT 0 router1,router2 PURPOSE=foo"
+ }
+
+ if (!zero_circ && !(circ = get_circ(smartlist_get(args,0)))) {
+ connection_printf_to_buf(conn, "552 Unknown circuit \"%s\"\r\n",
+ (char*)smartlist_get(args, 0));
+ SMARTLIST_FOREACH(args, char *, cp, tor_free(cp));
+ smartlist_free(args);
+ goto done;
+ }
+
+ if (smartlist_len(args) < 2) {
+ connection_printf_to_buf(conn,
+ "512 syntax error: not enough arguments.\r\n");
+ SMARTLIST_FOREACH(args, char *, cp, tor_free(cp));
+ smartlist_free(args);
+ goto done;
+ }
+
+ smartlist_split_string(router_nicknames, smartlist_get(args,1), ",", 0, 0);
+
+ SMARTLIST_FOREACH(args, char *, cp, tor_free(cp));
+ smartlist_free(args);
+
+ nodes = smartlist_new();
+ int first_node = zero_circ;
+ SMARTLIST_FOREACH_BEGIN(router_nicknames, const char *, n) {
+ const node_t *node = node_get_by_nickname(n, 0);
+ if (!node) {
+ connection_printf_to_buf(conn, "552 No such router \"%s\"\r\n", n);
+ goto done;
+ }
+ if (!node_has_preferred_descriptor(node, first_node)) {
+ connection_printf_to_buf(conn, "552 No descriptor for \"%s\"\r\n", n);
+ goto done;
+ }
+ smartlist_add(nodes, (void*)node);
+ first_node = 0;
+ } SMARTLIST_FOREACH_END(n);
+ if (!smartlist_len(nodes)) {
+ connection_write_str_to_buf("512 No router names provided\r\n", conn);
+ goto done;
+ }
+
+ if (zero_circ) {
+ /* start a new circuit */
+ circ = origin_circuit_init(intended_purpose, 0);
+ }
+
+ /* now circ refers to something that is ready to be extended */
+ first_node = zero_circ;
+ SMARTLIST_FOREACH(nodes, const node_t *, node,
+ {
+ extend_info_t *info = extend_info_from_node(node, first_node);
+ if (!info) {
+ tor_assert_nonfatal(first_node);
+ log_warn(LD_CONTROL,
+ "controller tried to connect to a node that lacks a suitable "
+ "descriptor, or which doesn't have any "
+ "addresses that are allowed by the firewall configuration; "
+ "circuit marked for closing.");
+ circuit_mark_for_close(TO_CIRCUIT(circ), -END_CIRC_REASON_CONNECTFAILED);
+ connection_write_str_to_buf("551 Couldn't start circuit\r\n", conn);
+ goto done;
+ }
+ circuit_append_new_exit(circ, info);
+ if (circ->build_state->desired_path_len > 1) {
+ circ->build_state->onehop_tunnel = 0;
+ }
+ extend_info_free(info);
+ first_node = 0;
+ });
+
+ /* now that we've populated the cpath, start extending */
+ if (zero_circ) {
+ int err_reason = 0;
+ if ((err_reason = circuit_handle_first_hop(circ)) < 0) {
+ circuit_mark_for_close(TO_CIRCUIT(circ), -err_reason);
+ connection_write_str_to_buf("551 Couldn't start circuit\r\n", conn);
+ goto done;
+ }
+ } else {
+ if (circ->base_.state == CIRCUIT_STATE_OPEN ||
+ circ->base_.state == CIRCUIT_STATE_GUARD_WAIT) {
+ int err_reason = 0;
+ circuit_set_state(TO_CIRCUIT(circ), CIRCUIT_STATE_BUILDING);
+ if ((err_reason = circuit_send_next_onion_skin(circ)) < 0) {
+ log_info(LD_CONTROL,
+ "send_next_onion_skin failed; circuit marked for closing.");
+ circuit_mark_for_close(TO_CIRCUIT(circ), -err_reason);
+ connection_write_str_to_buf("551 Couldn't send onion skin\r\n", conn);
+ goto done;
+ }
+ }
+ }
+
+ connection_printf_to_buf(conn, "250 EXTENDED %lu\r\n",
+ (unsigned long)circ->global_identifier);
+ if (zero_circ) /* send a 'launched' event, for completeness */
+ control_event_circuit_status(circ, CIRC_EVENT_LAUNCHED, 0);
+ done:
+ SMARTLIST_FOREACH(router_nicknames, char *, n, tor_free(n));
+ smartlist_free(router_nicknames);
+ smartlist_free(nodes);
+ return 0;
+}
+
+/** Called when we get a SETCIRCUITPURPOSE message. If we can find the
+ * circuit and it's a valid purpose, change it. */
+static int
+handle_control_setcircuitpurpose(control_connection_t *conn,
+ uint32_t len, const char *body)
+{
+ origin_circuit_t *circ = NULL;
+ uint8_t new_purpose;
+ smartlist_t *args;
+ (void) len; /* body is NUL-terminated, so it's safe to ignore the length. */
+
+ args = getargs_helper("SETCIRCUITPURPOSE", conn, body, 2, -1);
+ if (!args)
+ goto done;
+
+ if (!(circ = get_circ(smartlist_get(args,0)))) {
+ connection_printf_to_buf(conn, "552 Unknown circuit \"%s\"\r\n",
+ (char*)smartlist_get(args, 0));
+ goto done;
+ }
+
+ {
+ const char *purp = find_element_starting_with(args,1,"PURPOSE=");
+ if (!purp) {
+ connection_write_str_to_buf("552 No purpose given\r\n", conn);
+ goto done;
+ }
+ new_purpose = circuit_purpose_from_string(purp);
+ if (new_purpose == CIRCUIT_PURPOSE_UNKNOWN) {
+ connection_printf_to_buf(conn, "552 Unknown purpose \"%s\"\r\n", purp);
+ goto done;
+ }
+ }
+
+ circuit_change_purpose(TO_CIRCUIT(circ), new_purpose);
+ connection_write_str_to_buf("250 OK\r\n", conn);
+
+ done:
+ if (args) {
+ SMARTLIST_FOREACH(args, char *, cp, tor_free(cp));
+ smartlist_free(args);
+ }
+ return 0;
+}
+
+/** Called when we get an ATTACHSTREAM message. Try to attach the requested
+ * stream, and report success or failure. */
+static int
+handle_control_attachstream(control_connection_t *conn, uint32_t len,
+ const char *body)
+{
+ entry_connection_t *ap_conn = NULL;
+ origin_circuit_t *circ = NULL;
+ int zero_circ;
+ smartlist_t *args;
+ crypt_path_t *cpath=NULL;
+ int hop=0, hop_line_ok=1;
+ (void) len;
+
+ args = getargs_helper("ATTACHSTREAM", conn, body, 2, -1);
+ if (!args)
+ return 0;
+
+ zero_circ = !strcmp("0", (char*)smartlist_get(args,1));
+
+ if (!(ap_conn = get_stream(smartlist_get(args, 0)))) {
+ connection_printf_to_buf(conn, "552 Unknown stream \"%s\"\r\n",
+ (char*)smartlist_get(args, 0));
+ } else if (!zero_circ && !(circ = get_circ(smartlist_get(args, 1)))) {
+ connection_printf_to_buf(conn, "552 Unknown circuit \"%s\"\r\n",
+ (char*)smartlist_get(args, 1));
+ } else if (circ) {
+ const char *hopstring = find_element_starting_with(args,2,"HOP=");
+ if (hopstring) {
+ hopstring += strlen("HOP=");
+ hop = (int) tor_parse_ulong(hopstring, 10, 0, INT_MAX,
+ &hop_line_ok, NULL);
+ if (!hop_line_ok) { /* broken hop line */
+ connection_printf_to_buf(conn, "552 Bad value hop=%s\r\n", hopstring);
+ }
+ }
+ }
+ SMARTLIST_FOREACH(args, char *, cp, tor_free(cp));
+ smartlist_free(args);
+ if (!ap_conn || (!zero_circ && !circ) || !hop_line_ok)
+ return 0;
+
+ if (ENTRY_TO_CONN(ap_conn)->state != AP_CONN_STATE_CONTROLLER_WAIT &&
+ ENTRY_TO_CONN(ap_conn)->state != AP_CONN_STATE_CONNECT_WAIT &&
+ ENTRY_TO_CONN(ap_conn)->state != AP_CONN_STATE_RESOLVE_WAIT) {
+ connection_write_str_to_buf(
+ "555 Connection is not managed by controller.\r\n",
+ conn);
+ return 0;
+ }
+
+ /* Do we need to detach it first? */
+ if (ENTRY_TO_CONN(ap_conn)->state != AP_CONN_STATE_CONTROLLER_WAIT) {
+ edge_connection_t *edge_conn = ENTRY_TO_EDGE_CONN(ap_conn);
+ circuit_t *tmpcirc = circuit_get_by_edge_conn(edge_conn);
+ connection_edge_end(edge_conn, END_STREAM_REASON_TIMEOUT);
+ /* Un-mark it as ending, since we're going to reuse it. */
+ edge_conn->edge_has_sent_end = 0;
+ edge_conn->end_reason = 0;
+ if (tmpcirc)
+ circuit_detach_stream(tmpcirc, edge_conn);
+ CONNECTION_AP_EXPECT_NONPENDING(ap_conn);
+ TO_CONN(edge_conn)->state = AP_CONN_STATE_CONTROLLER_WAIT;
+ }
+
+ if (circ && (circ->base_.state != CIRCUIT_STATE_OPEN)) {
+ connection_write_str_to_buf(
+ "551 Can't attach stream to non-open origin circuit\r\n",
+ conn);
+ return 0;
+ }
+ /* Is this a single hop circuit? */
+ if (circ && (circuit_get_cpath_len(circ)<2 || hop==1)) {
+ connection_write_str_to_buf(
+ "551 Can't attach stream to this one-hop circuit.\r\n", conn);
+ return 0;
+ }
+
+ if (circ && hop>0) {
+ /* find this hop in the circuit, and set cpath */
+ cpath = circuit_get_cpath_hop(circ, hop);
+ if (!cpath) {
+ connection_printf_to_buf(conn,
+ "551 Circuit doesn't have %d hops.\r\n", hop);
+ return 0;
+ }
+ }
+ if (connection_ap_handshake_rewrite_and_attach(ap_conn, circ, cpath) < 0) {
+ connection_write_str_to_buf("551 Unable to attach stream\r\n", conn);
+ return 0;
+ }
+ send_control_done(conn);
+ return 0;
+}
+
+/** Called when we get a POSTDESCRIPTOR message. Try to learn the provided
+ * descriptor, and report success or failure. */
+static int
+handle_control_postdescriptor(control_connection_t *conn, uint32_t len,
+ const char *body)
+{
+ char *desc;
+ const char *msg=NULL;
+ uint8_t purpose = ROUTER_PURPOSE_GENERAL;
+ int cache = 0; /* eventually, we may switch this to 1 */
+
+ const char *cp = memchr(body, '\n', len);
+
+ if (cp == NULL) {
+ connection_printf_to_buf(conn, "251 Empty body\r\n");
+ return 0;
+ }
+ ++cp;
+
+ char *cmdline = tor_memdup_nulterm(body, cp-body);
+ smartlist_t *args = smartlist_new();
+ smartlist_split_string(args, cmdline, " ",
+ SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, 0);
+ SMARTLIST_FOREACH_BEGIN(args, char *, option) {
+ if (!strcasecmpstart(option, "purpose=")) {
+ option += strlen("purpose=");
+ purpose = router_purpose_from_string(option);
+ if (purpose == ROUTER_PURPOSE_UNKNOWN) {
+ connection_printf_to_buf(conn, "552 Unknown purpose \"%s\"\r\n",
+ option);
+ goto done;
+ }
+ } else if (!strcasecmpstart(option, "cache=")) {
+ option += strlen("cache=");
+ if (!strcasecmp(option, "no"))
+ cache = 0;
+ else if (!strcasecmp(option, "yes"))
+ cache = 1;
+ else {
+ connection_printf_to_buf(conn, "552 Unknown cache request \"%s\"\r\n",
+ option);
+ goto done;
+ }
+ } else { /* unrecognized argument? */
+ connection_printf_to_buf(conn,
+ "512 Unexpected argument \"%s\" to postdescriptor\r\n", option);
+ goto done;
+ }
+ } SMARTLIST_FOREACH_END(option);
+
+ read_escaped_data(cp, len-(cp-body), &desc);
+
+ switch (router_load_single_router(desc, purpose, cache, &msg)) {
+ case -1:
+ if (!msg) msg = "Could not parse descriptor";
+ connection_printf_to_buf(conn, "554 %s\r\n", msg);
+ break;
+ case 0:
+ if (!msg) msg = "Descriptor not added";
+ connection_printf_to_buf(conn, "251 %s\r\n",msg);
+ break;
+ case 1:
+ send_control_done(conn);
+ break;
+ }
+
+ tor_free(desc);
+ done:
+ SMARTLIST_FOREACH(args, char *, arg, tor_free(arg));
+ smartlist_free(args);
+ tor_free(cmdline);
+ return 0;
+}
+
+/** Called when we receive a REDIRECTSTERAM command. Try to change the target
+ * address of the named AP stream, and report success or failure. */
+static int
+handle_control_redirectstream(control_connection_t *conn, uint32_t len,
+ const char *body)
+{
+ entry_connection_t *ap_conn = NULL;
+ char *new_addr = NULL;
+ uint16_t new_port = 0;
+ smartlist_t *args;
+ (void) len;
+
+ args = getargs_helper("REDIRECTSTREAM", conn, body, 2, -1);
+ if (!args)
+ return 0;
+
+ if (!(ap_conn = get_stream(smartlist_get(args, 0)))
+ || !ap_conn->socks_request) {
+ connection_printf_to_buf(conn, "552 Unknown stream \"%s\"\r\n",
+ (char*)smartlist_get(args, 0));
+ } else {
+ int ok = 1;
+ if (smartlist_len(args) > 2) { /* they included a port too */
+ new_port = (uint16_t) tor_parse_ulong(smartlist_get(args, 2),
+ 10, 1, 65535, &ok, NULL);
+ }
+ if (!ok) {
+ connection_printf_to_buf(conn, "512 Cannot parse port \"%s\"\r\n",
+ (char*)smartlist_get(args, 2));
+ } else {
+ new_addr = tor_strdup(smartlist_get(args, 1));
+ }
+ }
+
+ SMARTLIST_FOREACH(args, char *, cp, tor_free(cp));
+ smartlist_free(args);
+ if (!new_addr)
+ return 0;
+
+ strlcpy(ap_conn->socks_request->address, new_addr,
+ sizeof(ap_conn->socks_request->address));
+ if (new_port)
+ ap_conn->socks_request->port = new_port;
+ tor_free(new_addr);
+ send_control_done(conn);
+ return 0;
+}
+
+/** Called when we get a CLOSESTREAM command; try to close the named stream
+ * and report success or failure. */
+static int
+handle_control_closestream(control_connection_t *conn, uint32_t len,
+ const char *body)
+{
+ entry_connection_t *ap_conn=NULL;
+ uint8_t reason=0;
+ smartlist_t *args;
+ int ok;
+ (void) len;
+
+ args = getargs_helper("CLOSESTREAM", conn, body, 2, -1);
+ if (!args)
+ return 0;
+
+ else if (!(ap_conn = get_stream(smartlist_get(args, 0))))
+ connection_printf_to_buf(conn, "552 Unknown stream \"%s\"\r\n",
+ (char*)smartlist_get(args, 0));
+ else {
+ reason = (uint8_t) tor_parse_ulong(smartlist_get(args,1), 10, 0, 255,
+ &ok, NULL);
+ if (!ok) {
+ connection_printf_to_buf(conn, "552 Unrecognized reason \"%s\"\r\n",
+ (char*)smartlist_get(args, 1));
+ ap_conn = NULL;
+ }
+ }
+ SMARTLIST_FOREACH(args, char *, cp, tor_free(cp));
+ smartlist_free(args);
+ if (!ap_conn)
+ return 0;
+
+ connection_mark_unattached_ap(ap_conn, reason);
+ send_control_done(conn);
+ return 0;
+}
+
+/** Called when we get a CLOSECIRCUIT command; try to close the named circuit
+ * and report success or failure. */
+static int
+handle_control_closecircuit(control_connection_t *conn, uint32_t len,
+ const char *body)
+{
+ origin_circuit_t *circ = NULL;
+ int safe = 0;
+ smartlist_t *args;
+ (void) len;
+
+ args = getargs_helper("CLOSECIRCUIT", conn, body, 1, -1);
+ if (!args)
+ return 0;
+
+ if (!(circ=get_circ(smartlist_get(args, 0))))
+ connection_printf_to_buf(conn, "552 Unknown circuit \"%s\"\r\n",
+ (char*)smartlist_get(args, 0));
+ else {
+ int i;
+ for (i=1; i < smartlist_len(args); ++i) {
+ if (!strcasecmp(smartlist_get(args, i), "IfUnused"))
+ safe = 1;
+ else
+ log_info(LD_CONTROL, "Skipping unknown option %s",
+ (char*)smartlist_get(args,i));
+ }
+ }
+ SMARTLIST_FOREACH(args, char *, cp, tor_free(cp));
+ smartlist_free(args);
+ if (!circ)
+ return 0;
+
+ if (!safe || !circ->p_streams) {
+ circuit_mark_for_close(TO_CIRCUIT(circ), END_CIRC_REASON_REQUESTED);
+ }
+
+ send_control_done(conn);
+ return 0;
+}
+
+/** Called when we get a RESOLVE command: start trying to resolve
+ * the listed addresses. */
+static int
+handle_control_resolve(control_connection_t *conn, uint32_t len,
+ const char *body)
+{
+ smartlist_t *args, *failed;
+ int is_reverse = 0;
+ (void) len; /* body is nul-terminated; it's safe to ignore the length */
+
+ if (!(conn->event_mask & (((event_mask_t)1)<<EVENT_ADDRMAP))) {
+ log_warn(LD_CONTROL, "Controller asked us to resolve an address, but "
+ "isn't listening for ADDRMAP events. It probably won't see "
+ "the answer.");
+ }
+ args = smartlist_new();
+ smartlist_split_string(args, body, " ",
+ SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, 0);
+ {
+ const char *modearg = find_element_starting_with(args, 0, "mode=");
+ if (modearg && !strcasecmp(modearg, "mode=reverse"))
+ is_reverse = 1;
+ }
+ failed = smartlist_new();
+ SMARTLIST_FOREACH(args, const char *, arg, {
+ if (!is_keyval_pair(arg)) {
+ if (dnsserv_launch_request(arg, is_reverse, conn)<0)
+ smartlist_add(failed, (char*)arg);
+ }
+ });
+
+ send_control_done(conn);
+ SMARTLIST_FOREACH(failed, const char *, arg, {
+ control_event_address_mapped(arg, arg, time(NULL),
+ "internal", 0);
+ });
+
+ SMARTLIST_FOREACH(args, char *, cp, tor_free(cp));
+ smartlist_free(args);
+ smartlist_free(failed);
+ return 0;
+}
+
+/** Called when we get a PROTOCOLINFO command: send back a reply. */
+static int
+handle_control_protocolinfo(control_connection_t *conn, uint32_t len,
+ const char *body)
+{
+ const char *bad_arg = NULL;
+ smartlist_t *args;
+ (void)len;
+
+ conn->have_sent_protocolinfo = 1;
+ args = smartlist_new();
+ smartlist_split_string(args, body, " ",
+ SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, 0);
+ SMARTLIST_FOREACH(args, const char *, arg, {
+ int ok;
+ tor_parse_long(arg, 10, 0, LONG_MAX, &ok, NULL);
+ if (!ok) {
+ bad_arg = arg;
+ break;
+ }
+ });
+ if (bad_arg) {
+ connection_printf_to_buf(conn, "513 No such version %s\r\n",
+ escaped(bad_arg));
+ /* Don't tolerate bad arguments when not authenticated. */
+ if (!STATE_IS_OPEN(TO_CONN(conn)->state))
+ connection_mark_for_close(TO_CONN(conn));
+ goto done;
+ } else {
+ const or_options_t *options = get_options();
+ int cookies = options->CookieAuthentication;
+ char *cfile = get_controller_cookie_file_name();
+ char *abs_cfile;
+ char *esc_cfile;
+ char *methods;
+ abs_cfile = make_path_absolute(cfile);
+ esc_cfile = esc_for_log(abs_cfile);
+ {
+ int passwd = (options->HashedControlPassword != NULL ||
+ options->HashedControlSessionPassword != NULL);
+ smartlist_t *mlist = smartlist_new();
+ if (cookies) {
+ smartlist_add(mlist, (char*)"COOKIE");
+ smartlist_add(mlist, (char*)"SAFECOOKIE");
+ }
+ if (passwd)
+ smartlist_add(mlist, (char*)"HASHEDPASSWORD");
+ if (!cookies && !passwd)
+ smartlist_add(mlist, (char*)"NULL");
+ methods = smartlist_join_strings(mlist, ",", 0, NULL);
+ smartlist_free(mlist);
+ }
+
+ connection_printf_to_buf(conn,
+ "250-PROTOCOLINFO 1\r\n"
+ "250-AUTH METHODS=%s%s%s\r\n"
+ "250-VERSION Tor=%s\r\n"
+ "250 OK\r\n",
+ methods,
+ cookies?" COOKIEFILE=":"",
+ cookies?esc_cfile:"",
+ escaped(VERSION));
+ tor_free(methods);
+ tor_free(cfile);
+ tor_free(abs_cfile);
+ tor_free(esc_cfile);
+ }
+ done:
+ SMARTLIST_FOREACH(args, char *, cp, tor_free(cp));
+ smartlist_free(args);
+ return 0;
+}
+
+/** Called when we get an AUTHCHALLENGE command. */
+static int
+handle_control_authchallenge(control_connection_t *conn, uint32_t len,
+ const char *body)
+{
+ const char *cp = body;
+ char *client_nonce;
+ size_t client_nonce_len;
+ char server_hash[DIGEST256_LEN];
+ char server_hash_encoded[HEX_DIGEST256_LEN+1];
+ char server_nonce[SAFECOOKIE_SERVER_NONCE_LEN];
+ char server_nonce_encoded[(2*SAFECOOKIE_SERVER_NONCE_LEN) + 1];
+
+ cp += strspn(cp, " \t\n\r");
+ if (!strcasecmpstart(cp, "SAFECOOKIE")) {
+ cp += strlen("SAFECOOKIE");
+ } else {
+ connection_write_str_to_buf("513 AUTHCHALLENGE only supports SAFECOOKIE "
+ "authentication\r\n", conn);
+ connection_mark_for_close(TO_CONN(conn));
+ return -1;
+ }
+
+ if (!authentication_cookie_is_set) {
+ connection_write_str_to_buf("515 Cookie authentication is disabled\r\n",
+ conn);
+ connection_mark_for_close(TO_CONN(conn));
+ return -1;
+ }
+
+ cp += strspn(cp, " \t\n\r");
+ if (*cp == '"') {
+ const char *newcp =
+ decode_escaped_string(cp, len - (cp - body),
+ &client_nonce, &client_nonce_len);
+ if (newcp == NULL) {
+ connection_write_str_to_buf("513 Invalid quoted client nonce\r\n",
+ conn);
+ connection_mark_for_close(TO_CONN(conn));
+ return -1;
+ }
+ cp = newcp;
+ } else {
+ size_t client_nonce_encoded_len = strspn(cp, "0123456789ABCDEFabcdef");
+
+ client_nonce_len = client_nonce_encoded_len / 2;
+ client_nonce = tor_malloc_zero(client_nonce_len);
+
+ if (base16_decode(client_nonce, client_nonce_len,
+ cp, client_nonce_encoded_len)
+ != (int) client_nonce_len) {
+ connection_write_str_to_buf("513 Invalid base16 client nonce\r\n",
+ conn);
+ connection_mark_for_close(TO_CONN(conn));
+ tor_free(client_nonce);
+ return -1;
+ }
+
+ cp += client_nonce_encoded_len;
+ }
+
+ cp += strspn(cp, " \t\n\r");
+ if (*cp != '\0' ||
+ cp != body + len) {
+ connection_write_str_to_buf("513 Junk at end of AUTHCHALLENGE command\r\n",
+ conn);
+ connection_mark_for_close(TO_CONN(conn));
+ tor_free(client_nonce);
+ return -1;
+ }
+ crypto_rand(server_nonce, SAFECOOKIE_SERVER_NONCE_LEN);
+
+ /* Now compute and send the server-to-controller response, and the
+ * server's nonce. */
+ tor_assert(authentication_cookie != NULL);
+
+ {
+ size_t tmp_len = (AUTHENTICATION_COOKIE_LEN +
+ client_nonce_len +
+ SAFECOOKIE_SERVER_NONCE_LEN);
+ char *tmp = tor_malloc_zero(tmp_len);
+ char *client_hash = tor_malloc_zero(DIGEST256_LEN);
+ memcpy(tmp, authentication_cookie, AUTHENTICATION_COOKIE_LEN);
+ memcpy(tmp + AUTHENTICATION_COOKIE_LEN, client_nonce, client_nonce_len);
+ memcpy(tmp + AUTHENTICATION_COOKIE_LEN + client_nonce_len,
+ server_nonce, SAFECOOKIE_SERVER_NONCE_LEN);
+
+ crypto_hmac_sha256(server_hash,
+ SAFECOOKIE_SERVER_TO_CONTROLLER_CONSTANT,
+ strlen(SAFECOOKIE_SERVER_TO_CONTROLLER_CONSTANT),
+ tmp,
+ tmp_len);
+
+ crypto_hmac_sha256(client_hash,
+ SAFECOOKIE_CONTROLLER_TO_SERVER_CONSTANT,
+ strlen(SAFECOOKIE_CONTROLLER_TO_SERVER_CONSTANT),
+ tmp,
+ tmp_len);
+
+ conn->safecookie_client_hash = client_hash;
+
+ tor_free(tmp);
+ }
+
+ base16_encode(server_hash_encoded, sizeof(server_hash_encoded),
+ server_hash, sizeof(server_hash));
+ base16_encode(server_nonce_encoded, sizeof(server_nonce_encoded),
+ server_nonce, sizeof(server_nonce));
+
+ connection_printf_to_buf(conn,
+ "250 AUTHCHALLENGE SERVERHASH=%s "
+ "SERVERNONCE=%s\r\n",
+ server_hash_encoded,
+ server_nonce_encoded);
+
+ tor_free(client_nonce);
+ return 0;
+}
+
+/** Called when we get a USEFEATURE command: parse the feature list, and
+ * set up the control_connection's options properly. */
+static int
+handle_control_usefeature(control_connection_t *conn,
+ uint32_t len,
+ const char *body)
+{
+ smartlist_t *args;
+ int bad = 0;
+ (void) len; /* body is nul-terminated; it's safe to ignore the length */
+ args = smartlist_new();
+ smartlist_split_string(args, body, " ",
+ SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, 0);
+ SMARTLIST_FOREACH_BEGIN(args, const char *, arg) {
+ if (!strcasecmp(arg, "VERBOSE_NAMES"))
+ ;
+ else if (!strcasecmp(arg, "EXTENDED_EVENTS"))
+ ;
+ else {
+ connection_printf_to_buf(conn, "552 Unrecognized feature \"%s\"\r\n",
+ arg);
+ bad = 1;
+ break;
+ }
+ } SMARTLIST_FOREACH_END(arg);
+
+ if (!bad) {
+ send_control_done(conn);
+ }
+
+ SMARTLIST_FOREACH(args, char *, cp, tor_free(cp));
+ smartlist_free(args);
+ return 0;
+}
+
+/** Implementation for the DROPGUARDS command. */
+static int
+handle_control_dropguards(control_connection_t *conn,
+ uint32_t len,
+ const char *body)
+{
+ smartlist_t *args;
+ (void) len; /* body is nul-terminated; it's safe to ignore the length */
+ args = smartlist_new();
+ smartlist_split_string(args, body, " ",
+ SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, 0);
+
+ static int have_warned = 0;
+ if (! have_warned) {
+ log_warn(LD_CONTROL, "DROPGUARDS is dangerous; make sure you understand "
+ "the risks before using it. It may be removed in a future "
+ "version of Tor.");
+ have_warned = 1;
+ }
+
+ if (smartlist_len(args)) {
+ connection_printf_to_buf(conn, "512 Too many arguments to DROPGUARDS\r\n");
+ } else {
+ remove_all_entry_guards();
+ send_control_done(conn);
+ }
+
+ SMARTLIST_FOREACH(args, char *, cp, tor_free(cp));
+ smartlist_free(args);
+ return 0;
+}
+
+/** Implementation for the HSFETCH command. */
+static int
+handle_control_hsfetch(control_connection_t *conn, uint32_t len,
+ const char *body)
+{
+ int i;
+ char digest[DIGEST_LEN], *hsaddress = NULL, *arg1 = NULL, *desc_id = NULL;
+ smartlist_t *args = NULL, *hsdirs = NULL;
+ (void) len; /* body is nul-terminated; it's safe to ignore the length */
+ static const char *hsfetch_command = "HSFETCH";
+ static const char *v2_str = "v2-";
+ const size_t v2_str_len = strlen(v2_str);
+ rend_data_t *rend_query = NULL;
+
+ /* Make sure we have at least one argument, the HSAddress. */
+ args = getargs_helper(hsfetch_command, conn, body, 1, -1);
+ if (!args) {
+ goto exit;
+ }
+
+ /* Extract the first argument (either HSAddress or DescID). */
+ arg1 = smartlist_get(args, 0);
+ /* Test if it's an HS address without the .onion part. */
+ if (rend_valid_v2_service_id(arg1)) {
+ hsaddress = arg1;
+ } else if (strcmpstart(arg1, v2_str) == 0 &&
+ rend_valid_descriptor_id(arg1 + v2_str_len) &&
+ base32_decode(digest, sizeof(digest), arg1 + v2_str_len,
+ REND_DESC_ID_V2_LEN_BASE32) == 0) {
+ /* We have a well formed version 2 descriptor ID. Keep the decoded value
+ * of the id. */
+ desc_id = digest;
+ } else {
+ connection_printf_to_buf(conn, "513 Invalid argument \"%s\"\r\n",
+ arg1);
+ goto done;
+ }
+
+ static const char *opt_server = "SERVER=";
+
+ /* Skip first argument because it's the HSAddress or DescID. */
+ for (i = 1; i < smartlist_len(args); ++i) {
+ const char *arg = smartlist_get(args, i);
+ const node_t *node;
+
+ if (!strcasecmpstart(arg, opt_server)) {
+ const char *server;
+
+ server = arg + strlen(opt_server);
+ node = node_get_by_hex_id(server, 0);
+ if (!node) {
+ connection_printf_to_buf(conn, "552 Server \"%s\" not found\r\n",
+ server);
+ goto done;
+ }
+ if (!hsdirs) {
+ /* Stores routerstatus_t object for each specified server. */
+ hsdirs = smartlist_new();
+ }
+ /* Valid server, add it to our local list. */
+ smartlist_add(hsdirs, node->rs);
+ } else {
+ connection_printf_to_buf(conn, "513 Unexpected argument \"%s\"\r\n",
+ arg);
+ goto done;
+ }
+ }
+
+ rend_query = rend_data_client_create(hsaddress, desc_id, NULL,
+ REND_NO_AUTH);
+ if (rend_query == NULL) {
+ connection_printf_to_buf(conn, "551 Error creating the HS query\r\n");
+ goto done;
+ }
+
+ /* Using a descriptor ID, we force the user to provide at least one
+ * hsdir server using the SERVER= option. */
+ if (desc_id && (!hsdirs || !smartlist_len(hsdirs))) {
+ connection_printf_to_buf(conn, "512 %s option is required\r\n",
+ opt_server);
+ goto done;
+ }
+
+ /* We are about to trigger HSDir fetch so send the OK now because after
+ * that 650 event(s) are possible so better to have the 250 OK before them
+ * to avoid out of order replies. */
+ send_control_done(conn);
+
+ /* Trigger the fetch using the built rend query and possibly a list of HS
+ * directory to use. This function ignores the client cache thus this will
+ * always send a fetch command. */
+ rend_client_fetch_v2_desc(rend_query, hsdirs);
+
+ done:
+ SMARTLIST_FOREACH(args, char *, cp, tor_free(cp));
+ smartlist_free(args);
+ /* Contains data pointer that we don't own thus no cleanup. */
+ smartlist_free(hsdirs);
+ rend_data_free(rend_query);
+ exit:
+ return 0;
+}
+
+/** Implementation for the HSPOST command. */
+static int
+handle_control_hspost(control_connection_t *conn,
+ uint32_t len,
+ const char *body)
+{
+ static const char *opt_server = "SERVER=";
+ static const char *opt_hsaddress = "HSADDRESS=";
+ smartlist_t *hs_dirs = NULL;
+ const char *encoded_desc = body;
+ size_t encoded_desc_len = len;
+ const char *onion_address = NULL;
+
+ char *cp = memchr(body, '\n', len);
+ if (cp == NULL) {
+ connection_printf_to_buf(conn, "251 Empty body\r\n");
+ return 0;
+ }
+ char *argline = tor_strndup(body, cp-body);
+
+ smartlist_t *args = smartlist_new();
+
+ /* If any SERVER= or HSADDRESS= options were specified, try to parse
+ * the options line. */
+ if (!strcasecmpstart(argline, opt_server) ||
+ !strcasecmpstart(argline, opt_hsaddress)) {
+ /* encoded_desc begins after a newline character */
+ cp = cp + 1;
+ encoded_desc = cp;
+ encoded_desc_len = len-(cp-body);
+
+ smartlist_split_string(args, argline, " ",
+ SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, 0);
+ SMARTLIST_FOREACH_BEGIN(args, const char *, arg) {
+ if (!strcasecmpstart(arg, opt_server)) {
+ const char *server = arg + strlen(opt_server);
+ const node_t *node = node_get_by_hex_id(server, 0);
+
+ if (!node || !node->rs) {
+ connection_printf_to_buf(conn, "552 Server \"%s\" not found\r\n",
+ server);
+ goto done;
+ }
+ /* Valid server, add it to our local list. */
+ if (!hs_dirs)
+ hs_dirs = smartlist_new();
+ smartlist_add(hs_dirs, node->rs);
+ } else if (!strcasecmpstart(arg, opt_hsaddress)) {
+ const char *address = arg + strlen(opt_hsaddress);
+ if (!hs_address_is_valid(address)) {
+ connection_printf_to_buf(conn, "512 Malformed onion address\r\n");
+ goto done;
+ }
+ onion_address = address;
+ } else {
+ connection_printf_to_buf(conn, "512 Unexpected argument \"%s\"\r\n",
+ arg);
+ goto done;
+ }
+ } SMARTLIST_FOREACH_END(arg);
+ }
+
+ /* Handle the v3 case. */
+ if (onion_address) {
+ char *desc_str = NULL;
+ read_escaped_data(encoded_desc, encoded_desc_len, &desc_str);
+ if (hs_control_hspost_command(desc_str, onion_address, hs_dirs) < 0) {
+ connection_printf_to_buf(conn, "554 Invalid descriptor\r\n");
+ } else {
+ send_control_done(conn);
+ }
+ tor_free(desc_str);
+ goto done;
+ }
+
+ /* From this point on, it is only v2. */
+
+ /* Read the dot encoded descriptor, and parse it. */
+ rend_encoded_v2_service_descriptor_t *desc =
+ tor_malloc_zero(sizeof(rend_encoded_v2_service_descriptor_t));
+ read_escaped_data(encoded_desc, encoded_desc_len, &desc->desc_str);
+
+ rend_service_descriptor_t *parsed = NULL;
+ char *intro_content = NULL;
+ size_t intro_size;
+ size_t encoded_size;
+ const char *next_desc;
+ if (!rend_parse_v2_service_descriptor(&parsed, desc->desc_id, &intro_content,
+ &intro_size, &encoded_size,
+ &next_desc, desc->desc_str, 1)) {
+ /* Post the descriptor. */
+ char serviceid[REND_SERVICE_ID_LEN_BASE32+1];
+ if (!rend_get_service_id(parsed->pk, serviceid)) {
+ smartlist_t *descs = smartlist_new();
+ smartlist_add(descs, desc);
+
+ /* We are about to trigger HS descriptor upload so send the OK now
+ * because after that 650 event(s) are possible so better to have the
+ * 250 OK before them to avoid out of order replies. */
+ send_control_done(conn);
+
+ /* Trigger the descriptor upload */
+ directory_post_to_hs_dir(parsed, descs, hs_dirs, serviceid, 0);
+ smartlist_free(descs);
+ }
+
+ rend_service_descriptor_free(parsed);
+ } else {
+ connection_printf_to_buf(conn, "554 Invalid descriptor\r\n");
+ }
+
+ tor_free(intro_content);
+ rend_encoded_v2_service_descriptor_free(desc);
+ done:
+ tor_free(argline);
+ smartlist_free(hs_dirs); /* Contents belong to the rend service code. */
+ SMARTLIST_FOREACH(args, char *, arg, tor_free(arg));
+ smartlist_free(args);
+ return 0;
+}
+
+/* Helper function for ADD_ONION that adds an ephemeral service depending on
+ * the given hs_version.
+ *
+ * The secret key in pk depends on the hs_version. The ownership of the key
+ * used in pk is given to the HS subsystem so the caller must stop accessing
+ * it after.
+ *
+ * The port_cfgs is a list of service port. Ownership transferred to service.
+ * The max_streams refers to the MaxStreams= key.
+ * The max_streams_close_circuit refers to the MaxStreamsCloseCircuit key.
+ * The auth_type is the authentication type of the clients in auth_clients.
+ * The ownership of that list is transferred to the service.
+ *
+ * On success (RSAE_OKAY), the address_out points to a newly allocated string
+ * containing the onion address without the .onion part. On error, address_out
+ * is untouched. */
+static hs_service_add_ephemeral_status_t
+add_onion_helper_add_service(int hs_version,
+ add_onion_secret_key_t *pk,
+ smartlist_t *port_cfgs, int max_streams,
+ int max_streams_close_circuit, int auth_type,
+ smartlist_t *auth_clients, char **address_out)
+{
+ hs_service_add_ephemeral_status_t ret;
+
+ tor_assert(pk);
+ tor_assert(port_cfgs);
+ tor_assert(address_out);
+
+ switch (hs_version) {
+ case HS_VERSION_TWO:
+ ret = rend_service_add_ephemeral(pk->v2, port_cfgs, max_streams,
+ max_streams_close_circuit, auth_type,
+ auth_clients, address_out);
+ break;
+ case HS_VERSION_THREE:
+ ret = hs_service_add_ephemeral(pk->v3, port_cfgs, max_streams,
+ max_streams_close_circuit, address_out);
+ break;
+ default:
+ tor_assert_unreached();
+ }
+
+ return ret;
+}
+
+/** Called when we get a ADD_ONION command; parse the body, and set up
+ * the new ephemeral Onion Service. */
+static int
+handle_control_add_onion(control_connection_t *conn,
+ uint32_t len,
+ const char *body)
+{
+ smartlist_t *args;
+ int arg_len;
+ (void) len; /* body is nul-terminated; it's safe to ignore the length */
+ args = getargs_helper("ADD_ONION", conn, body, 2, -1);
+ if (!args)
+ return 0;
+ arg_len = smartlist_len(args);
+
+ /* Parse all of the arguments that do not involve handling cryptographic
+ * material first, since there's no reason to touch that at all if any of
+ * the other arguments are malformed.
+ */
+ smartlist_t *port_cfgs = smartlist_new();
+ smartlist_t *auth_clients = NULL;
+ smartlist_t *auth_created_clients = NULL;
+ int discard_pk = 0;
+ int detach = 0;
+ int max_streams = 0;
+ int max_streams_close_circuit = 0;
+ rend_auth_type_t auth_type = REND_NO_AUTH;
+ /* Default to adding an anonymous hidden service if no flag is given */
+ int non_anonymous = 0;
+ for (int i = 1; i < arg_len; i++) {
+ static const char *port_prefix = "Port=";
+ static const char *flags_prefix = "Flags=";
+ static const char *max_s_prefix = "MaxStreams=";
+ static const char *auth_prefix = "ClientAuth=";
+
+ const char *arg = smartlist_get(args, (int)i);
+ if (!strcasecmpstart(arg, port_prefix)) {
+ /* "Port=VIRTPORT[,TARGET]". */
+ const char *port_str = arg + strlen(port_prefix);
+
+ rend_service_port_config_t *cfg =
+ rend_service_parse_port_config(port_str, ",", NULL);
+ if (!cfg) {
+ connection_printf_to_buf(conn, "512 Invalid VIRTPORT/TARGET\r\n");
+ goto out;
+ }
+ smartlist_add(port_cfgs, cfg);
+ } else if (!strcasecmpstart(arg, max_s_prefix)) {
+ /* "MaxStreams=[0..65535]". */
+ const char *max_s_str = arg + strlen(max_s_prefix);
+ int ok = 0;
+ max_streams = (int)tor_parse_long(max_s_str, 10, 0, 65535, &ok, NULL);
+ if (!ok) {
+ connection_printf_to_buf(conn, "512 Invalid MaxStreams\r\n");
+ goto out;
+ }
+ } else if (!strcasecmpstart(arg, flags_prefix)) {
+ /* "Flags=Flag[,Flag]", where Flag can be:
+ * * 'DiscardPK' - If tor generates the keypair, do not include it in
+ * the response.
+ * * 'Detach' - Do not tie this onion service to any particular control
+ * connection.
+ * * 'MaxStreamsCloseCircuit' - Close the circuit if MaxStreams is
+ * exceeded.
+ * * 'BasicAuth' - Client authorization using the 'basic' method.
+ * * 'NonAnonymous' - Add a non-anonymous Single Onion Service. If this
+ * flag is present, tor must be in non-anonymous
+ * hidden service mode. If this flag is absent,
+ * tor must be in anonymous hidden service mode.
+ */
+ static const char *discard_flag = "DiscardPK";
+ static const char *detach_flag = "Detach";
+ static const char *max_s_close_flag = "MaxStreamsCloseCircuit";
+ static const char *basicauth_flag = "BasicAuth";
+ static const char *non_anonymous_flag = "NonAnonymous";
+
+ smartlist_t *flags = smartlist_new();
+ int bad = 0;
+
+ smartlist_split_string(flags, arg + strlen(flags_prefix), ",",
+ SPLIT_IGNORE_BLANK, 0);
+ if (smartlist_len(flags) < 1) {
+ connection_printf_to_buf(conn, "512 Invalid 'Flags' argument\r\n");
+ bad = 1;
+ }
+ SMARTLIST_FOREACH_BEGIN(flags, const char *, flag)
+ {
+ if (!strcasecmp(flag, discard_flag)) {
+ discard_pk = 1;
+ } else if (!strcasecmp(flag, detach_flag)) {
+ detach = 1;
+ } else if (!strcasecmp(flag, max_s_close_flag)) {
+ max_streams_close_circuit = 1;
+ } else if (!strcasecmp(flag, basicauth_flag)) {
+ auth_type = REND_BASIC_AUTH;
+ } else if (!strcasecmp(flag, non_anonymous_flag)) {
+ non_anonymous = 1;
+ } else {
+ connection_printf_to_buf(conn,
+ "512 Invalid 'Flags' argument: %s\r\n",
+ escaped(flag));
+ bad = 1;
+ break;
+ }
+ } SMARTLIST_FOREACH_END(flag);
+ SMARTLIST_FOREACH(flags, char *, cp, tor_free(cp));
+ smartlist_free(flags);
+ if (bad)
+ goto out;
+ } else if (!strcasecmpstart(arg, auth_prefix)) {
+ char *err_msg = NULL;
+ int created = 0;
+ rend_authorized_client_t *client =
+ add_onion_helper_clientauth(arg + strlen(auth_prefix),
+ &created, &err_msg);
+ if (!client) {
+ if (err_msg) {
+ connection_write_str_to_buf(err_msg, conn);
+ tor_free(err_msg);
+ }
+ goto out;
+ }
+
+ if (auth_clients != NULL) {
+ int bad = 0;
+ SMARTLIST_FOREACH_BEGIN(auth_clients, rend_authorized_client_t *, ac) {
+ if (strcmp(ac->client_name, client->client_name) == 0) {
+ bad = 1;
+ break;
+ }
+ } SMARTLIST_FOREACH_END(ac);
+ if (bad) {
+ connection_printf_to_buf(conn,
+ "512 Duplicate name in ClientAuth\r\n");
+ rend_authorized_client_free(client);
+ goto out;
+ }
+ } else {
+ auth_clients = smartlist_new();
+ auth_created_clients = smartlist_new();
+ }
+ smartlist_add(auth_clients, client);
+ if (created) {
+ smartlist_add(auth_created_clients, client);
+ }
+ } else {
+ connection_printf_to_buf(conn, "513 Invalid argument\r\n");
+ goto out;
+ }
+ }
+ if (smartlist_len(port_cfgs) == 0) {
+ connection_printf_to_buf(conn, "512 Missing 'Port' argument\r\n");
+ goto out;
+ } else if (auth_type == REND_NO_AUTH && auth_clients != NULL) {
+ connection_printf_to_buf(conn, "512 No auth type specified\r\n");
+ goto out;
+ } else if (auth_type != REND_NO_AUTH && auth_clients == NULL) {
+ connection_printf_to_buf(conn, "512 No auth clients specified\r\n");
+ goto out;
+ } else if ((auth_type == REND_BASIC_AUTH &&
+ smartlist_len(auth_clients) > 512) ||
+ (auth_type == REND_STEALTH_AUTH &&
+ smartlist_len(auth_clients) > 16)) {
+ connection_printf_to_buf(conn, "512 Too many auth clients\r\n");
+ goto out;
+ } else if (non_anonymous != rend_service_non_anonymous_mode_enabled(
+ get_options())) {
+ /* If we failed, and the non-anonymous flag is set, Tor must be in
+ * anonymous hidden service mode.
+ * The error message changes based on the current Tor config:
+ * 512 Tor is in anonymous hidden service mode
+ * 512 Tor is in non-anonymous hidden service mode
+ * (I've deliberately written them out in full here to aid searchability.)
+ */
+ connection_printf_to_buf(conn, "512 Tor is in %sanonymous hidden service "
+ "mode\r\n",
+ non_anonymous ? "" : "non-");
+ goto out;
+ }
+
+ /* Parse the "keytype:keyblob" argument. */
+ int hs_version = 0;
+ add_onion_secret_key_t pk = { NULL };
+ const char *key_new_alg = NULL;
+ char *key_new_blob = NULL;
+ char *err_msg = NULL;
+
+ if (add_onion_helper_keyarg(smartlist_get(args, 0), discard_pk,
+ &key_new_alg, &key_new_blob, &pk, &hs_version,
+ &err_msg) < 0) {
+ if (err_msg) {
+ connection_write_str_to_buf(err_msg, conn);
+ tor_free(err_msg);
+ }
+ goto out;
+ }
+ tor_assert(!err_msg);
+
+ /* Hidden service version 3 don't have client authentication support so if
+ * ClientAuth was given, send back an error. */
+ if (hs_version == HS_VERSION_THREE && auth_clients) {
+ connection_printf_to_buf(conn, "513 ClientAuth not supported\r\n");
+ goto out;
+ }
+
+ /* Create the HS, using private key pk, client authentication auth_type,
+ * the list of auth_clients, and port config port_cfg.
+ * rend_service_add_ephemeral() will take ownership of pk and port_cfg,
+ * regardless of success/failure.
+ */
+ char *service_id = NULL;
+ int ret = add_onion_helper_add_service(hs_version, &pk, port_cfgs,
+ max_streams,
+ max_streams_close_circuit, auth_type,
+ auth_clients, &service_id);
+ port_cfgs = NULL; /* port_cfgs is now owned by the rendservice code. */
+ auth_clients = NULL; /* so is auth_clients */
+ switch (ret) {
+ case RSAE_OKAY:
+ {
+ if (detach) {
+ if (!detached_onion_services)
+ detached_onion_services = smartlist_new();
+ smartlist_add(detached_onion_services, service_id);
+ } else {
+ if (!conn->ephemeral_onion_services)
+ conn->ephemeral_onion_services = smartlist_new();
+ smartlist_add(conn->ephemeral_onion_services, service_id);
+ }
+
+ tor_assert(service_id);
+ connection_printf_to_buf(conn, "250-ServiceID=%s\r\n", service_id);
+ if (key_new_alg) {
+ tor_assert(key_new_blob);
+ connection_printf_to_buf(conn, "250-PrivateKey=%s:%s\r\n",
+ key_new_alg, key_new_blob);
+ }
+ if (auth_created_clients) {
+ SMARTLIST_FOREACH(auth_created_clients, rend_authorized_client_t *, ac, {
+ char *encoded = rend_auth_encode_cookie(ac->descriptor_cookie,
+ auth_type);
+ tor_assert(encoded);
+ connection_printf_to_buf(conn, "250-ClientAuth=%s:%s\r\n",
+ ac->client_name, encoded);
+ memwipe(encoded, 0, strlen(encoded));
+ tor_free(encoded);
+ });
+ }
+
+ connection_printf_to_buf(conn, "250 OK\r\n");
+ break;
+ }
+ case RSAE_BADPRIVKEY:
+ connection_printf_to_buf(conn, "551 Failed to generate onion address\r\n");
+ break;
+ case RSAE_ADDREXISTS:
+ connection_printf_to_buf(conn, "550 Onion address collision\r\n");
+ break;
+ case RSAE_BADVIRTPORT:
+ connection_printf_to_buf(conn, "512 Invalid VIRTPORT/TARGET\r\n");
+ break;
+ case RSAE_BADAUTH:
+ connection_printf_to_buf(conn, "512 Invalid client authorization\r\n");
+ break;
+ case RSAE_INTERNAL: /* FALLSTHROUGH */
+ default:
+ connection_printf_to_buf(conn, "551 Failed to add Onion Service\r\n");
+ }
+ if (key_new_blob) {
+ memwipe(key_new_blob, 0, strlen(key_new_blob));
+ tor_free(key_new_blob);
+ }
+
+ out:
+ if (port_cfgs) {
+ SMARTLIST_FOREACH(port_cfgs, rend_service_port_config_t*, p,
+ rend_service_port_config_free(p));
+ smartlist_free(port_cfgs);
+ }
+
+ if (auth_clients) {
+ SMARTLIST_FOREACH(auth_clients, rend_authorized_client_t *, ac,
+ rend_authorized_client_free(ac));
+ smartlist_free(auth_clients);
+ }
+ if (auth_created_clients) {
+ // Do not free entries; they are the same as auth_clients
+ smartlist_free(auth_created_clients);
+ }
+
+ SMARTLIST_FOREACH(args, char *, cp, {
+ memwipe(cp, 0, strlen(cp));
+ tor_free(cp);
+ });
+ smartlist_free(args);
+ return 0;
+}
+
+/** Helper function to handle parsing the KeyType:KeyBlob argument to the
+ * ADD_ONION command. Return a new crypto_pk_t and if a new key was generated
+ * and the private key not discarded, the algorithm and serialized private key,
+ * or NULL and an optional control protocol error message on failure. The
+ * caller is responsible for freeing the returned key_new_blob and err_msg.
+ *
+ * Note: The error messages returned are deliberately vague to avoid echoing
+ * key material.
+ */
+STATIC int
+add_onion_helper_keyarg(const char *arg, int discard_pk,
+ const char **key_new_alg_out, char **key_new_blob_out,
+ add_onion_secret_key_t *decoded_key, int *hs_version,
+ char **err_msg_out)
+{
+ smartlist_t *key_args = smartlist_new();
+ crypto_pk_t *pk = NULL;
+ const char *key_new_alg = NULL;
+ char *key_new_blob = NULL;
+ char *err_msg = NULL;
+ int ret = -1;
+
+ smartlist_split_string(key_args, arg, ":", SPLIT_IGNORE_BLANK, 0);
+ if (smartlist_len(key_args) != 2) {
+ err_msg = tor_strdup("512 Invalid key type/blob\r\n");
+ goto err;
+ }
+
+ /* The format is "KeyType:KeyBlob". */
+ static const char *key_type_new = "NEW";
+ static const char *key_type_best = "BEST";
+ static const char *key_type_rsa1024 = "RSA1024";
+ static const char *key_type_ed25519_v3 = "ED25519-V3";
+
+ const char *key_type = smartlist_get(key_args, 0);
+ const char *key_blob = smartlist_get(key_args, 1);
+
+ if (!strcasecmp(key_type_rsa1024, key_type)) {
+ /* "RSA:<Base64 Blob>" - Loading a pre-existing RSA1024 key. */
+ pk = crypto_pk_base64_decode(key_blob, strlen(key_blob));
+ if (!pk) {
+ err_msg = tor_strdup("512 Failed to decode RSA key\r\n");
+ goto err;
+ }
+ if (crypto_pk_num_bits(pk) != PK_BYTES*8) {
+ crypto_pk_free(pk);
+ err_msg = tor_strdup("512 Invalid RSA key size\r\n");
+ goto err;
+ }
+ decoded_key->v2 = pk;
+ *hs_version = HS_VERSION_TWO;
+ } else if (!strcasecmp(key_type_ed25519_v3, key_type)) {
+ /* "ED25519-V3:<Base64 Blob>" - Loading a pre-existing ed25519 key. */
+ ed25519_secret_key_t *sk = tor_malloc_zero(sizeof(*sk));
+ if (base64_decode((char *) sk->seckey, sizeof(sk->seckey), key_blob,
+ strlen(key_blob)) != sizeof(sk->seckey)) {
+ tor_free(sk);
+ err_msg = tor_strdup("512 Failed to decode ED25519-V3 key\r\n");
+ goto err;
+ }
+ decoded_key->v3 = sk;
+ *hs_version = HS_VERSION_THREE;
+ } else if (!strcasecmp(key_type_new, key_type)) {
+ /* "NEW:<Algorithm>" - Generating a new key, blob as algorithm. */
+ if (!strcasecmp(key_type_rsa1024, key_blob) ||
+ !strcasecmp(key_type_best, key_blob)) {
+ /* "RSA1024", RSA 1024 bit, also currently "BEST" by default. */
+ pk = crypto_pk_new();
+ if (crypto_pk_generate_key(pk)) {
+ tor_asprintf(&err_msg, "551 Failed to generate %s key\r\n",
+ key_type_rsa1024);
+ goto err;
+ }
+ if (!discard_pk) {
+ if (crypto_pk_base64_encode(pk, &key_new_blob)) {
+ crypto_pk_free(pk);
+ tor_asprintf(&err_msg, "551 Failed to encode %s key\r\n",
+ key_type_rsa1024);
+ goto err;
+ }
+ key_new_alg = key_type_rsa1024;
+ }
+ decoded_key->v2 = pk;
+ *hs_version = HS_VERSION_TWO;
+ } else if (!strcasecmp(key_type_ed25519_v3, key_blob)) {
+ ed25519_secret_key_t *sk = tor_malloc_zero(sizeof(*sk));
+ if (ed25519_secret_key_generate(sk, 1) < 0) {
+ tor_free(sk);
+ tor_asprintf(&err_msg, "551 Failed to generate %s key\r\n",
+ key_type_ed25519_v3);
+ goto err;
+ }
+ if (!discard_pk) {
+ ssize_t len = base64_encode_size(sizeof(sk->seckey), 0) + 1;
+ key_new_blob = tor_malloc_zero(len);
+ if (base64_encode(key_new_blob, len, (const char *) sk->seckey,
+ sizeof(sk->seckey), 0) != (len - 1)) {
+ tor_free(sk);
+ tor_free(key_new_blob);
+ tor_asprintf(&err_msg, "551 Failed to encode %s key\r\n",
+ key_type_ed25519_v3);
+ goto err;
+ }
+ key_new_alg = key_type_ed25519_v3;
+ }
+ decoded_key->v3 = sk;
+ *hs_version = HS_VERSION_THREE;
+ } else {
+ err_msg = tor_strdup("513 Invalid key type\r\n");
+ goto err;
+ }
+ } else {
+ err_msg = tor_strdup("513 Invalid key type\r\n");
+ goto err;
+ }
+
+ /* Succeeded in loading or generating a private key. */
+ ret = 0;
+
+ err:
+ SMARTLIST_FOREACH(key_args, char *, cp, {
+ memwipe(cp, 0, strlen(cp));
+ tor_free(cp);
+ });
+ smartlist_free(key_args);
+
+ if (err_msg_out) {
+ *err_msg_out = err_msg;
+ } else {
+ tor_free(err_msg);
+ }
+ *key_new_alg_out = key_new_alg;
+ *key_new_blob_out = key_new_blob;
+
+ return ret;
+}
+
+/** Helper function to handle parsing a ClientAuth argument to the
+ * ADD_ONION command. Return a new rend_authorized_client_t, or NULL
+ * and an optional control protocol error message on failure. The
+ * caller is responsible for freeing the returned auth_client and err_msg.
+ *
+ * If 'created' is specified, it will be set to 1 when a new cookie has
+ * been generated.
+ */
+STATIC rend_authorized_client_t *
+add_onion_helper_clientauth(const char *arg, int *created, char **err_msg)
+{
+ int ok = 0;
+
+ tor_assert(arg);
+ tor_assert(created);
+ tor_assert(err_msg);
+ *err_msg = NULL;
+
+ smartlist_t *auth_args = smartlist_new();
+ rend_authorized_client_t *client =
+ tor_malloc_zero(sizeof(rend_authorized_client_t));
+ smartlist_split_string(auth_args, arg, ":", 0, 0);
+ if (smartlist_len(auth_args) < 1 || smartlist_len(auth_args) > 2) {
+ *err_msg = tor_strdup("512 Invalid ClientAuth syntax\r\n");
+ goto err;
+ }
+ client->client_name = tor_strdup(smartlist_get(auth_args, 0));
+ if (smartlist_len(auth_args) == 2) {
+ char *decode_err_msg = NULL;
+ if (rend_auth_decode_cookie(smartlist_get(auth_args, 1),
+ client->descriptor_cookie,
+ NULL, &decode_err_msg) < 0) {
+ tor_assert(decode_err_msg);
+ tor_asprintf(err_msg, "512 %s\r\n", decode_err_msg);
+ tor_free(decode_err_msg);
+ goto err;
+ }
+ *created = 0;
+ } else {
+ crypto_rand((char *) client->descriptor_cookie, REND_DESC_COOKIE_LEN);
+ *created = 1;
+ }
+
+ if (!rend_valid_client_name(client->client_name)) {
+ *err_msg = tor_strdup("512 Invalid name in ClientAuth\r\n");
+ goto err;
+ }
+
+ ok = 1;
+ err:
+ SMARTLIST_FOREACH(auth_args, char *, item, tor_free(item));
+ smartlist_free(auth_args);
+ if (!ok) {
+ rend_authorized_client_free(client);
+ client = NULL;
+ }
+ return client;
+}
+
+/** Called when we get a DEL_ONION command; parse the body, and remove
+ * the existing ephemeral Onion Service. */
+static int
+handle_control_del_onion(control_connection_t *conn,
+ uint32_t len,
+ const char *body)
+{
+ int hs_version = 0;
+ smartlist_t *args;
+ (void) len; /* body is nul-terminated; it's safe to ignore the length */
+ args = getargs_helper("DEL_ONION", conn, body, 1, 1);
+ if (!args)
+ return 0;
+
+ const char *service_id = smartlist_get(args, 0);
+ if (rend_valid_v2_service_id(service_id)) {
+ hs_version = HS_VERSION_TWO;
+ } else if (hs_address_is_valid(service_id)) {
+ hs_version = HS_VERSION_THREE;
+ } else {
+ connection_printf_to_buf(conn, "512 Malformed Onion Service id\r\n");
+ goto out;
+ }
+
+ /* Determine if the onion service belongs to this particular control
+ * connection, or if it is in the global list of detached services. If it
+ * is in neither, either the service ID is invalid in some way, or it
+ * explicitly belongs to a different control connection, and an error
+ * should be returned.
+ */
+ smartlist_t *services[2] = {
+ conn->ephemeral_onion_services,
+ detached_onion_services
+ };
+ smartlist_t *onion_services = NULL;
+ int idx = -1;
+ for (size_t i = 0; i < ARRAY_LENGTH(services); i++) {
+ idx = smartlist_string_pos(services[i], service_id);
+ if (idx != -1) {
+ onion_services = services[i];
+ break;
+ }
+ }
+ if (onion_services == NULL) {
+ connection_printf_to_buf(conn, "552 Unknown Onion Service id\r\n");
+ } else {
+ int ret = -1;
+ switch (hs_version) {
+ case HS_VERSION_TWO:
+ ret = rend_service_del_ephemeral(service_id);
+ break;
+ case HS_VERSION_THREE:
+ ret = hs_service_del_ephemeral(service_id);
+ break;
+ default:
+ /* The ret value will be -1 thus hitting the warning below. This should
+ * never happen because of the check at the start of the function. */
+ break;
+ }
+ if (ret < 0) {
+ /* This should *NEVER* fail, since the service is on either the
+ * per-control connection list, or the global one.
+ */
+ log_warn(LD_BUG, "Failed to remove Onion Service %s.",
+ escaped(service_id));
+ tor_fragile_assert();
+ }
+
+ /* Remove/scrub the service_id from the appropriate list. */
+ char *cp = smartlist_get(onion_services, idx);
+ smartlist_del(onion_services, idx);
+ memwipe(cp, 0, strlen(cp));
+ tor_free(cp);
+
+ send_control_done(conn);
+ }
+
+ out:
+ SMARTLIST_FOREACH(args, char *, cp, {
+ memwipe(cp, 0, strlen(cp));
+ tor_free(cp);
+ });
+ smartlist_free(args);
+ return 0;
+}
+
+/** Called when <b>conn</b> has no more bytes left on its outbuf. */
+int
+connection_control_finished_flushing(control_connection_t *conn)
+{
+ tor_assert(conn);
+ return 0;
+}
+
+/** Called when <b>conn</b> has gotten its socket closed. */
+int
+connection_control_reached_eof(control_connection_t *conn)
+{
+ tor_assert(conn);
+
+ log_info(LD_CONTROL,"Control connection reached EOF. Closing.");
+ connection_mark_for_close(TO_CONN(conn));
+ return 0;
+}
+
+/** Shut down this Tor instance in the same way that SIGINT would, but
+ * with a log message appropriate for the loss of an owning controller. */
+static void
+lost_owning_controller(const char *owner_type, const char *loss_manner)
+{
+ log_notice(LD_CONTROL, "Owning controller %s has %s -- exiting now.",
+ owner_type, loss_manner);
+
+ activate_signal(SIGTERM);
+}
+
+/** Called when <b>conn</b> is being freed. */
+void
+connection_control_closed(control_connection_t *conn)
+{
+ tor_assert(conn);
+
+ conn->event_mask = 0;
+ control_update_global_event_mask();
+
+ /* Close all ephemeral Onion Services if any.
+ * The list and it's contents are scrubbed/freed in connection_free_.
+ */
+ if (conn->ephemeral_onion_services) {
+ SMARTLIST_FOREACH_BEGIN(conn->ephemeral_onion_services, char *, cp) {
+ if (rend_valid_v2_service_id(cp)) {
+ rend_service_del_ephemeral(cp);
+ } else if (hs_address_is_valid(cp)) {
+ hs_service_del_ephemeral(cp);
+ } else {
+ /* An invalid .onion in our list should NEVER happen */
+ tor_fragile_assert();
+ }
+ } SMARTLIST_FOREACH_END(cp);
+ }
+
+ if (conn->is_owning_control_connection) {
+ lost_owning_controller("connection", "closed");
+ }
+}
+
+/** Return true iff <b>cmd</b> is allowable (or at least forgivable) at this
+ * stage of the protocol. */
+static int
+is_valid_initial_command(control_connection_t *conn, const char *cmd)
+{
+ if (conn->base_.state == CONTROL_CONN_STATE_OPEN)
+ return 1;
+ if (!strcasecmp(cmd, "PROTOCOLINFO"))
+ return (!conn->have_sent_protocolinfo &&
+ conn->safecookie_client_hash == NULL);
+ if (!strcasecmp(cmd, "AUTHCHALLENGE"))
+ return (conn->safecookie_client_hash == NULL);
+ if (!strcasecmp(cmd, "AUTHENTICATE") ||
+ !strcasecmp(cmd, "QUIT"))
+ return 1;
+ return 0;
+}
+
+/** Do not accept any control command of more than 1MB in length. Anything
+ * that needs to be anywhere near this long probably means that one of our
+ * interfaces is broken. */
+#define MAX_COMMAND_LINE_LENGTH (1024*1024)
+
+/** Wrapper around peek_buf_has_control0 command: presents the same
+ * interface as that underlying functions, but takes a connection_t intead of
+ * a buf_t.
+ */
+static int
+peek_connection_has_control0_command(connection_t *conn)
+{
+ return peek_buf_has_control0_command(conn->inbuf);
+}
+
+static int
+peek_connection_has_http_command(connection_t *conn)
+{
+ return peek_buf_has_http_command(conn->inbuf);
+}
+
+static const char CONTROLPORT_IS_NOT_AN_HTTP_PROXY_MSG[] =
+ "HTTP/1.0 501 Tor ControlPort is not an HTTP proxy"
+ "\r\nContent-Type: text/html; charset=iso-8859-1\r\n\r\n"
+ "<html>\n"
+ "<head>\n"
+ "<title>Tor's ControlPort is not an HTTP proxy</title>\n"
+ "</head>\n"
+ "<body>\n"
+ "<h1>Tor's ControlPort is not an HTTP proxy</h1>\n"
+ "<p>\n"
+ "It appears you have configured your web browser to use Tor's control port"
+ " as an HTTP proxy.\n"
+ "This is not correct: Tor's default SOCKS proxy port is 9050.\n"
+ "Please configure your client accordingly.\n"
+ "</p>\n"
+ "<p>\n"
+ "See <a href=\"https://www.torproject.org/documentation.html\">"
+ "https://www.torproject.org/documentation.html</a> for more "
+ "information.\n"
+ "<!-- Plus this comment, to make the body response more than 512 bytes, so "
+ " IE will be willing to display it. Comment comment comment comment "
+ " comment comment comment comment comment comment comment comment.-->\n"
+ "</p>\n"
+ "</body>\n"
+ "</html>\n";
+
+/** Called when data has arrived on a v1 control connection: Try to fetch
+ * commands from conn->inbuf, and execute them.
+ */
+int
+connection_control_process_inbuf(control_connection_t *conn)
+{
+ size_t data_len;
+ uint32_t cmd_data_len;
+ int cmd_len;
+ char *args;
+
+ tor_assert(conn);
+ tor_assert(conn->base_.state == CONTROL_CONN_STATE_OPEN ||
+ conn->base_.state == CONTROL_CONN_STATE_NEEDAUTH);
+
+ if (!conn->incoming_cmd) {
+ conn->incoming_cmd = tor_malloc(1024);
+ conn->incoming_cmd_len = 1024;
+ conn->incoming_cmd_cur_len = 0;
+ }
+
+ if (conn->base_.state == CONTROL_CONN_STATE_NEEDAUTH &&
+ peek_connection_has_control0_command(TO_CONN(conn))) {
+ /* Detect v0 commands and send a "no more v0" message. */
+ size_t body_len;
+ char buf[128];
+ set_uint16(buf+2, htons(0x0000)); /* type == error */
+ set_uint16(buf+4, htons(0x0001)); /* code == internal error */
+ strlcpy(buf+6, "The v0 control protocol is not supported by Tor 0.1.2.17 "
+ "and later; upgrade your controller.",
+ sizeof(buf)-6);
+ body_len = 2+strlen(buf+6)+2; /* code, msg, nul. */
+ set_uint16(buf+0, htons(body_len));
+ connection_buf_add(buf, 4+body_len, TO_CONN(conn));
+
+ connection_mark_and_flush(TO_CONN(conn));
+ return 0;
+ }
+
+ /* If the user has the HTTP proxy port and the control port confused. */
+ if (conn->base_.state == CONTROL_CONN_STATE_NEEDAUTH &&
+ peek_connection_has_http_command(TO_CONN(conn))) {
+ connection_write_str_to_buf(CONTROLPORT_IS_NOT_AN_HTTP_PROXY_MSG, conn);
+ log_notice(LD_CONTROL, "Received HTTP request on ControlPort");
+ connection_mark_and_flush(TO_CONN(conn));
+ return 0;
+ }
+
+ again:
+ while (1) {
+ size_t last_idx;
+ int r;
+ /* First, fetch a line. */
+ do {
+ data_len = conn->incoming_cmd_len - conn->incoming_cmd_cur_len;
+ r = connection_buf_get_line(TO_CONN(conn),
+ conn->incoming_cmd+conn->incoming_cmd_cur_len,
+ &data_len);
+ if (r == 0)
+ /* Line not all here yet. Wait. */
+ return 0;
+ else if (r == -1) {
+ if (data_len + conn->incoming_cmd_cur_len > MAX_COMMAND_LINE_LENGTH) {
+ connection_write_str_to_buf("500 Line too long.\r\n", conn);
+ connection_stop_reading(TO_CONN(conn));
+ connection_mark_and_flush(TO_CONN(conn));
+ }
+ while (conn->incoming_cmd_len < data_len+conn->incoming_cmd_cur_len)
+ conn->incoming_cmd_len *= 2;
+ conn->incoming_cmd = tor_realloc(conn->incoming_cmd,
+ conn->incoming_cmd_len);
+ }
+ } while (r != 1);
+
+ tor_assert(data_len);
+
+ last_idx = conn->incoming_cmd_cur_len;
+ conn->incoming_cmd_cur_len += (int)data_len;
+
+ /* We have appended a line to incoming_cmd. Is the command done? */
+ if (last_idx == 0 && *conn->incoming_cmd != '+')
+ /* One line command, didn't start with '+'. */
+ break;
+ /* XXXX this code duplication is kind of dumb. */
+ if (last_idx+3 == conn->incoming_cmd_cur_len &&
+ tor_memeq(conn->incoming_cmd + last_idx, ".\r\n", 3)) {
+ /* Just appended ".\r\n"; we're done. Remove it. */
+ conn->incoming_cmd[last_idx] = '\0';
+ conn->incoming_cmd_cur_len -= 3;
+ break;
+ } else if (last_idx+2 == conn->incoming_cmd_cur_len &&
+ tor_memeq(conn->incoming_cmd + last_idx, ".\n", 2)) {
+ /* Just appended ".\n"; we're done. Remove it. */
+ conn->incoming_cmd[last_idx] = '\0';
+ conn->incoming_cmd_cur_len -= 2;
+ break;
+ }
+ /* Otherwise, read another line. */
+ }
+ data_len = conn->incoming_cmd_cur_len;
+ /* Okay, we now have a command sitting on conn->incoming_cmd. See if we
+ * recognize it.
+ */
+ cmd_len = 0;
+ while ((size_t)cmd_len < data_len
+ && !TOR_ISSPACE(conn->incoming_cmd[cmd_len]))
+ ++cmd_len;
+
+ conn->incoming_cmd[cmd_len]='\0';
+ args = conn->incoming_cmd+cmd_len+1;
+ tor_assert(data_len>(size_t)cmd_len);
+ data_len -= (cmd_len+1); /* skip the command and NUL we added after it */
+ while (TOR_ISSPACE(*args)) {
+ ++args;
+ --data_len;
+ }
+
+ /* If the connection is already closing, ignore further commands */
+ if (TO_CONN(conn)->marked_for_close) {
+ return 0;
+ }
+
+ /* Otherwise, Quit is always valid. */
+ if (!strcasecmp(conn->incoming_cmd, "QUIT")) {
+ connection_write_str_to_buf("250 closing connection\r\n", conn);
+ connection_mark_and_flush(TO_CONN(conn));
+ return 0;
+ }
+
+ if (conn->base_.state == CONTROL_CONN_STATE_NEEDAUTH &&
+ !is_valid_initial_command(conn, conn->incoming_cmd)) {
+ connection_write_str_to_buf("514 Authentication required.\r\n", conn);
+ connection_mark_for_close(TO_CONN(conn));
+ return 0;
+ }
+
+ if (data_len >= UINT32_MAX) {
+ connection_write_str_to_buf("500 A 4GB command? Nice try.\r\n", conn);
+ connection_mark_for_close(TO_CONN(conn));
+ return 0;
+ }
+
+ /* XXXX Why is this not implemented as a table like the GETINFO
+ * items are? Even handling the plus signs at the beginnings of
+ * commands wouldn't be very hard with proper macros. */
+ cmd_data_len = (uint32_t)data_len;
+ if (!strcasecmp(conn->incoming_cmd, "SETCONF")) {
+ if (handle_control_setconf(conn, cmd_data_len, args))
+ return -1;
+ } else if (!strcasecmp(conn->incoming_cmd, "RESETCONF")) {
+ if (handle_control_resetconf(conn, cmd_data_len, args))
+ return -1;
+ } else if (!strcasecmp(conn->incoming_cmd, "GETCONF")) {
+ if (handle_control_getconf(conn, cmd_data_len, args))
+ return -1;
+ } else if (!strcasecmp(conn->incoming_cmd, "+LOADCONF")) {
+ if (handle_control_loadconf(conn, cmd_data_len, args))
+ return -1;
+ } else if (!strcasecmp(conn->incoming_cmd, "SETEVENTS")) {
+ if (handle_control_setevents(conn, cmd_data_len, args))
+ return -1;
+ } else if (!strcasecmp(conn->incoming_cmd, "AUTHENTICATE")) {
+ if (handle_control_authenticate(conn, cmd_data_len, args))
+ return -1;
+ } else if (!strcasecmp(conn->incoming_cmd, "SAVECONF")) {
+ if (handle_control_saveconf(conn, cmd_data_len, args))
+ return -1;
+ } else if (!strcasecmp(conn->incoming_cmd, "SIGNAL")) {
+ if (handle_control_signal(conn, cmd_data_len, args))
+ return -1;
+ } else if (!strcasecmp(conn->incoming_cmd, "TAKEOWNERSHIP")) {
+ if (handle_control_takeownership(conn, cmd_data_len, args))
+ return -1;
+ } else if (!strcasecmp(conn->incoming_cmd, "MAPADDRESS")) {
+ if (handle_control_mapaddress(conn, cmd_data_len, args))
+ return -1;
+ } else if (!strcasecmp(conn->incoming_cmd, "GETINFO")) {
+ if (handle_control_getinfo(conn, cmd_data_len, args))
+ return -1;
+ } else if (!strcasecmp(conn->incoming_cmd, "EXTENDCIRCUIT")) {
+ if (handle_control_extendcircuit(conn, cmd_data_len, args))
+ return -1;
+ } else if (!strcasecmp(conn->incoming_cmd, "SETCIRCUITPURPOSE")) {
+ if (handle_control_setcircuitpurpose(conn, cmd_data_len, args))
+ return -1;
+ } else if (!strcasecmp(conn->incoming_cmd, "SETROUTERPURPOSE")) {
+ connection_write_str_to_buf("511 SETROUTERPURPOSE is obsolete.\r\n", conn);
+ } else if (!strcasecmp(conn->incoming_cmd, "ATTACHSTREAM")) {
+ if (handle_control_attachstream(conn, cmd_data_len, args))
+ return -1;
+ } else if (!strcasecmp(conn->incoming_cmd, "+POSTDESCRIPTOR")) {
+ if (handle_control_postdescriptor(conn, cmd_data_len, args))
+ return -1;
+ } else if (!strcasecmp(conn->incoming_cmd, "REDIRECTSTREAM")) {
+ if (handle_control_redirectstream(conn, cmd_data_len, args))
+ return -1;
+ } else if (!strcasecmp(conn->incoming_cmd, "CLOSESTREAM")) {
+ if (handle_control_closestream(conn, cmd_data_len, args))
+ return -1;
+ } else if (!strcasecmp(conn->incoming_cmd, "CLOSECIRCUIT")) {
+ if (handle_control_closecircuit(conn, cmd_data_len, args))
+ return -1;
+ } else if (!strcasecmp(conn->incoming_cmd, "USEFEATURE")) {
+ if (handle_control_usefeature(conn, cmd_data_len, args))
+ return -1;
+ } else if (!strcasecmp(conn->incoming_cmd, "RESOLVE")) {
+ if (handle_control_resolve(conn, cmd_data_len, args))
+ return -1;
+ } else if (!strcasecmp(conn->incoming_cmd, "PROTOCOLINFO")) {
+ if (handle_control_protocolinfo(conn, cmd_data_len, args))
+ return -1;
+ } else if (!strcasecmp(conn->incoming_cmd, "AUTHCHALLENGE")) {
+ if (handle_control_authchallenge(conn, cmd_data_len, args))
+ return -1;
+ } else if (!strcasecmp(conn->incoming_cmd, "DROPGUARDS")) {
+ if (handle_control_dropguards(conn, cmd_data_len, args))
+ return -1;
+ } else if (!strcasecmp(conn->incoming_cmd, "HSFETCH")) {
+ if (handle_control_hsfetch(conn, cmd_data_len, args))
+ return -1;
+ } else if (!strcasecmp(conn->incoming_cmd, "+HSPOST")) {
+ if (handle_control_hspost(conn, cmd_data_len, args))
+ return -1;
+ } else if (!strcasecmp(conn->incoming_cmd, "ADD_ONION")) {
+ int ret = handle_control_add_onion(conn, cmd_data_len, args);
+ memwipe(args, 0, cmd_data_len); /* Scrub the private key. */
+ if (ret)
+ return -1;
+ } else if (!strcasecmp(conn->incoming_cmd, "DEL_ONION")) {
+ int ret = handle_control_del_onion(conn, cmd_data_len, args);
+ memwipe(args, 0, cmd_data_len); /* Scrub the service id/pk. */
+ if (ret)
+ return -1;
+ } else {
+ connection_printf_to_buf(conn, "510 Unrecognized command \"%s\"\r\n",
+ conn->incoming_cmd);
+ }
+
+ conn->incoming_cmd_cur_len = 0;
+ goto again;
+}
+
+/** Something major has happened to circuit <b>circ</b>: tell any
+ * interested control connections. */
+int
+control_event_circuit_status(origin_circuit_t *circ, circuit_status_event_t tp,
+ int reason_code)
+{
+ const char *status;
+ char reasons[64] = "";
+ if (!EVENT_IS_INTERESTING(EVENT_CIRCUIT_STATUS))
+ return 0;
+ tor_assert(circ);
+
+ switch (tp)
+ {
+ case CIRC_EVENT_LAUNCHED: status = "LAUNCHED"; break;
+ case CIRC_EVENT_BUILT: status = "BUILT"; break;
+ case CIRC_EVENT_EXTENDED: status = "EXTENDED"; break;
+ case CIRC_EVENT_FAILED: status = "FAILED"; break;
+ case CIRC_EVENT_CLOSED: status = "CLOSED"; break;
+ default:
+ log_warn(LD_BUG, "Unrecognized status code %d", (int)tp);
+ tor_fragile_assert();
+ return 0;
+ }
+
+ if (tp == CIRC_EVENT_FAILED || tp == CIRC_EVENT_CLOSED) {
+ const char *reason_str = circuit_end_reason_to_control_string(reason_code);
+ char unk_reason_buf[16];
+ if (!reason_str) {
+ tor_snprintf(unk_reason_buf, 16, "UNKNOWN_%d", reason_code);
+ reason_str = unk_reason_buf;
+ }
+ if (reason_code > 0 && reason_code & END_CIRC_REASON_FLAG_REMOTE) {
+ tor_snprintf(reasons, sizeof(reasons),
+ " REASON=DESTROYED REMOTE_REASON=%s", reason_str);
+ } else {
+ tor_snprintf(reasons, sizeof(reasons),
+ " REASON=%s", reason_str);
+ }
+ }
+
+ {
+ char *circdesc = circuit_describe_status_for_controller(circ);
+ const char *sp = strlen(circdesc) ? " " : "";
+ send_control_event(EVENT_CIRCUIT_STATUS,
+ "650 CIRC %lu %s%s%s%s\r\n",
+ (unsigned long)circ->global_identifier,
+ status, sp,
+ circdesc,
+ reasons);
+ tor_free(circdesc);
+ }
+
+ return 0;
+}
+
+/** Something minor has happened to circuit <b>circ</b>: tell any
+ * interested control connections. */
+static int
+control_event_circuit_status_minor(origin_circuit_t *circ,
+ circuit_status_minor_event_t e,
+ int purpose, const struct timeval *tv)
+{
+ const char *event_desc;
+ char event_tail[160] = "";
+ if (!EVENT_IS_INTERESTING(EVENT_CIRCUIT_STATUS_MINOR))
+ return 0;
+ tor_assert(circ);
+
+ switch (e)
+ {
+ case CIRC_MINOR_EVENT_PURPOSE_CHANGED:
+ event_desc = "PURPOSE_CHANGED";
+
+ {
+ /* event_tail can currently be up to 68 chars long */
+ const char *hs_state_str =
+ circuit_purpose_to_controller_hs_state_string(purpose);
+ tor_snprintf(event_tail, sizeof(event_tail),
+ " OLD_PURPOSE=%s%s%s",
+ circuit_purpose_to_controller_string(purpose),
+ (hs_state_str != NULL) ? " OLD_HS_STATE=" : "",
+ (hs_state_str != NULL) ? hs_state_str : "");
+ }
+
+ break;
+ case CIRC_MINOR_EVENT_CANNIBALIZED:
+ event_desc = "CANNIBALIZED";
+
+ {
+ /* event_tail can currently be up to 130 chars long */
+ const char *hs_state_str =
+ circuit_purpose_to_controller_hs_state_string(purpose);
+ const struct timeval *old_timestamp_began = tv;
+ char tbuf[ISO_TIME_USEC_LEN+1];
+ format_iso_time_nospace_usec(tbuf, old_timestamp_began);
+
+ tor_snprintf(event_tail, sizeof(event_tail),
+ " OLD_PURPOSE=%s%s%s OLD_TIME_CREATED=%s",
+ circuit_purpose_to_controller_string(purpose),
+ (hs_state_str != NULL) ? " OLD_HS_STATE=" : "",
+ (hs_state_str != NULL) ? hs_state_str : "",
+ tbuf);
+ }
+
+ break;
+ default:
+ log_warn(LD_BUG, "Unrecognized status code %d", (int)e);
+ tor_fragile_assert();
+ return 0;
+ }
+
+ {
+ char *circdesc = circuit_describe_status_for_controller(circ);
+ const char *sp = strlen(circdesc) ? " " : "";
+ send_control_event(EVENT_CIRCUIT_STATUS_MINOR,
+ "650 CIRC_MINOR %lu %s%s%s%s\r\n",
+ (unsigned long)circ->global_identifier,
+ event_desc, sp,
+ circdesc,
+ event_tail);
+ tor_free(circdesc);
+ }
+
+ return 0;
+}
+
+/**
+ * <b>circ</b> has changed its purpose from <b>old_purpose</b>: tell any
+ * interested controllers.
+ */
+int
+control_event_circuit_purpose_changed(origin_circuit_t *circ,
+ int old_purpose)
+{
+ return control_event_circuit_status_minor(circ,
+ CIRC_MINOR_EVENT_PURPOSE_CHANGED,
+ old_purpose,
+ NULL);
+}
+
+/**
+ * <b>circ</b> has changed its purpose from <b>old_purpose</b>, and its
+ * created-time from <b>old_tv_created</b>: tell any interested controllers.
+ */
+int
+control_event_circuit_cannibalized(origin_circuit_t *circ,
+ int old_purpose,
+ const struct timeval *old_tv_created)
+{
+ return control_event_circuit_status_minor(circ,
+ CIRC_MINOR_EVENT_CANNIBALIZED,
+ old_purpose,
+ old_tv_created);
+}
+
+/** Given an AP connection <b>conn</b> and a <b>len</b>-character buffer
+ * <b>buf</b>, determine the address:port combination requested on
+ * <b>conn</b>, and write it to <b>buf</b>. Return 0 on success, -1 on
+ * failure. */
+static int
+write_stream_target_to_buf(entry_connection_t *conn, char *buf, size_t len)
+{
+ char buf2[256];
+ if (conn->chosen_exit_name)
+ if (tor_snprintf(buf2, sizeof(buf2), ".%s.exit", conn->chosen_exit_name)<0)
+ return -1;
+ if (!conn->socks_request)
+ return -1;
+ if (tor_snprintf(buf, len, "%s%s%s:%d",
+ conn->socks_request->address,
+ conn->chosen_exit_name ? buf2 : "",
+ !conn->chosen_exit_name && connection_edge_is_rendezvous_stream(
+ ENTRY_TO_EDGE_CONN(conn)) ? ".onion" : "",
+ conn->socks_request->port)<0)
+ return -1;
+ return 0;
+}
+
+/** Something has happened to the stream associated with AP connection
+ * <b>conn</b>: tell any interested control connections. */
+int
+control_event_stream_status(entry_connection_t *conn, stream_status_event_t tp,
+ int reason_code)
+{
+ char reason_buf[64];
+ char addrport_buf[64];
+ const char *status;
+ circuit_t *circ;
+ origin_circuit_t *origin_circ = NULL;
+ char buf[256];
+ const char *purpose = "";
+ tor_assert(conn->socks_request);
+
+ if (!EVENT_IS_INTERESTING(EVENT_STREAM_STATUS))
+ return 0;
+
+ if (tp == STREAM_EVENT_CLOSED &&
+ (reason_code & END_STREAM_REASON_FLAG_ALREADY_SENT_CLOSED))
+ return 0;
+
+ write_stream_target_to_buf(conn, buf, sizeof(buf));
+
+ reason_buf[0] = '\0';
+ switch (tp)
+ {
+ case STREAM_EVENT_SENT_CONNECT: status = "SENTCONNECT"; break;
+ case STREAM_EVENT_SENT_RESOLVE: status = "SENTRESOLVE"; break;
+ case STREAM_EVENT_SUCCEEDED: status = "SUCCEEDED"; break;
+ case STREAM_EVENT_FAILED: status = "FAILED"; break;
+ case STREAM_EVENT_CLOSED: status = "CLOSED"; break;
+ case STREAM_EVENT_NEW: status = "NEW"; break;
+ case STREAM_EVENT_NEW_RESOLVE: status = "NEWRESOLVE"; break;
+ case STREAM_EVENT_FAILED_RETRIABLE: status = "DETACHED"; break;
+ case STREAM_EVENT_REMAP: status = "REMAP"; break;
+ default:
+ log_warn(LD_BUG, "Unrecognized status code %d", (int)tp);
+ return 0;
+ }
+ if (reason_code && (tp == STREAM_EVENT_FAILED ||
+ tp == STREAM_EVENT_CLOSED ||
+ tp == STREAM_EVENT_FAILED_RETRIABLE)) {
+ const char *reason_str = stream_end_reason_to_control_string(reason_code);
+ char *r = NULL;
+ if (!reason_str) {
+ tor_asprintf(&r, " UNKNOWN_%d", reason_code);
+ reason_str = r;
+ }
+ if (reason_code & END_STREAM_REASON_FLAG_REMOTE)
+ tor_snprintf(reason_buf, sizeof(reason_buf),
+ " REASON=END REMOTE_REASON=%s", reason_str);
+ else
+ tor_snprintf(reason_buf, sizeof(reason_buf),
+ " REASON=%s", reason_str);
+ tor_free(r);
+ } else if (reason_code && tp == STREAM_EVENT_REMAP) {
+ switch (reason_code) {
+ case REMAP_STREAM_SOURCE_CACHE:
+ strlcpy(reason_buf, " SOURCE=CACHE", sizeof(reason_buf));
+ break;
+ case REMAP_STREAM_SOURCE_EXIT:
+ strlcpy(reason_buf, " SOURCE=EXIT", sizeof(reason_buf));
+ break;
+ default:
+ tor_snprintf(reason_buf, sizeof(reason_buf), " REASON=UNKNOWN_%d",
+ reason_code);
+ /* XXX do we want SOURCE=UNKNOWN_%d above instead? -RD */
+ break;
+ }
+ }
+
+ if (tp == STREAM_EVENT_NEW || tp == STREAM_EVENT_NEW_RESOLVE) {
+ /*
+ * When the control conn is an AF_UNIX socket and we have no address,
+ * it gets set to "(Tor_internal)"; see dnsserv_launch_request() in
+ * dnsserv.c.
+ */
+ if (strcmp(ENTRY_TO_CONN(conn)->address, "(Tor_internal)") != 0) {
+ tor_snprintf(addrport_buf,sizeof(addrport_buf), " SOURCE_ADDR=%s:%d",
+ ENTRY_TO_CONN(conn)->address, ENTRY_TO_CONN(conn)->port);
+ } else {
+ /*
+ * else leave it blank so control on AF_UNIX doesn't need to make
+ * something up.
+ */
+ addrport_buf[0] = '\0';
+ }
+ } else {
+ addrport_buf[0] = '\0';
+ }
+
+ if (tp == STREAM_EVENT_NEW_RESOLVE) {
+ purpose = " PURPOSE=DNS_REQUEST";
+ } else if (tp == STREAM_EVENT_NEW) {
+ if (conn->use_begindir) {
+ connection_t *linked = ENTRY_TO_CONN(conn)->linked_conn;
+ int linked_dir_purpose = -1;
+ if (linked && linked->type == CONN_TYPE_DIR)
+ linked_dir_purpose = linked->purpose;
+ if (DIR_PURPOSE_IS_UPLOAD(linked_dir_purpose))
+ purpose = " PURPOSE=DIR_UPLOAD";
+ else
+ purpose = " PURPOSE=DIR_FETCH";
+ } else
+ purpose = " PURPOSE=USER";
+ }
+
+ circ = circuit_get_by_edge_conn(ENTRY_TO_EDGE_CONN(conn));
+ if (circ && CIRCUIT_IS_ORIGIN(circ))
+ origin_circ = TO_ORIGIN_CIRCUIT(circ);
+ send_control_event(EVENT_STREAM_STATUS,
+ "650 STREAM %"PRIu64" %s %lu %s%s%s%s\r\n",
+ (ENTRY_TO_CONN(conn)->global_identifier),
+ status,
+ origin_circ?
+ (unsigned long)origin_circ->global_identifier : 0ul,
+ buf, reason_buf, addrport_buf, purpose);
+
+ /* XXX need to specify its intended exit, etc? */
+
+ return 0;
+}
+
+/** Figure out the best name for the target router of an OR connection
+ * <b>conn</b>, and write it into the <b>len</b>-character buffer
+ * <b>name</b>. */
+static void
+orconn_target_get_name(char *name, size_t len, or_connection_t *conn)
+{
+ const node_t *node = node_get_by_id(conn->identity_digest);
+ if (node) {
+ tor_assert(len > MAX_VERBOSE_NICKNAME_LEN);
+ node_get_verbose_nickname(node, name);
+ } else if (! tor_digest_is_zero(conn->identity_digest)) {
+ name[0] = '$';
+ base16_encode(name+1, len-1, conn->identity_digest,
+ DIGEST_LEN);
+ } else {
+ tor_snprintf(name, len, "%s:%d",
+ conn->base_.address, conn->base_.port);
+ }
+}
+
+/** Called when the status of an OR connection <b>conn</b> changes: tell any
+ * interested control connections. <b>tp</b> is the new status for the
+ * connection. If <b>conn</b> has just closed or failed, then <b>reason</b>
+ * may be the reason why.
+ */
+int
+control_event_or_conn_status(or_connection_t *conn, or_conn_status_event_t tp,
+ int reason)
+{
+ int ncircs = 0;
+ const char *status;
+ char name[128];
+ char ncircs_buf[32] = {0}; /* > 8 + log10(2^32)=10 + 2 */
+
+ if (!EVENT_IS_INTERESTING(EVENT_OR_CONN_STATUS))
+ return 0;
+
+ switch (tp)
+ {
+ case OR_CONN_EVENT_LAUNCHED: status = "LAUNCHED"; break;
+ case OR_CONN_EVENT_CONNECTED: status = "CONNECTED"; break;
+ case OR_CONN_EVENT_FAILED: status = "FAILED"; break;
+ case OR_CONN_EVENT_CLOSED: status = "CLOSED"; break;
+ case OR_CONN_EVENT_NEW: status = "NEW"; break;
+ default:
+ log_warn(LD_BUG, "Unrecognized status code %d", (int)tp);
+ return 0;
+ }
+ if (conn->chan) {
+ ncircs = circuit_count_pending_on_channel(TLS_CHAN_TO_BASE(conn->chan));
+ } else {
+ ncircs = 0;
+ }
+ ncircs += connection_or_get_num_circuits(conn);
+ if (ncircs && (tp == OR_CONN_EVENT_FAILED || tp == OR_CONN_EVENT_CLOSED)) {
+ tor_snprintf(ncircs_buf, sizeof(ncircs_buf), " NCIRCS=%d", ncircs);
+ }
+
+ orconn_target_get_name(name, sizeof(name), conn);
+ send_control_event(EVENT_OR_CONN_STATUS,
+ "650 ORCONN %s %s%s%s%s ID=%"PRIu64"\r\n",
+ name, status,
+ reason ? " REASON=" : "",
+ orconn_end_reason_to_control_string(reason),
+ ncircs_buf,
+ (conn->base_.global_identifier));
+
+ return 0;
+}
+
+/**
+ * Print out STREAM_BW event for a single conn
+ */
+int
+control_event_stream_bandwidth(edge_connection_t *edge_conn)
+{
+ struct timeval now;
+ char tbuf[ISO_TIME_USEC_LEN+1];
+ if (EVENT_IS_INTERESTING(EVENT_STREAM_BANDWIDTH_USED)) {
+ if (!edge_conn->n_read && !edge_conn->n_written)
+ return 0;
+
+ tor_gettimeofday(&now);
+ format_iso_time_nospace_usec(tbuf, &now);
+ send_control_event(EVENT_STREAM_BANDWIDTH_USED,
+ "650 STREAM_BW %"PRIu64" %lu %lu %s\r\n",
+ (edge_conn->base_.global_identifier),
+ (unsigned long)edge_conn->n_read,
+ (unsigned long)edge_conn->n_written,
+ tbuf);
+
+ edge_conn->n_written = edge_conn->n_read = 0;
+ }
+
+ return 0;
+}
+
+/** A second or more has elapsed: tell any interested control
+ * connections how much bandwidth streams have used. */
+int
+control_event_stream_bandwidth_used(void)
+{
+ if (EVENT_IS_INTERESTING(EVENT_STREAM_BANDWIDTH_USED)) {
+ smartlist_t *conns = get_connection_array();
+ edge_connection_t *edge_conn;
+ struct timeval now;
+ char tbuf[ISO_TIME_USEC_LEN+1];
+
+ SMARTLIST_FOREACH_BEGIN(conns, connection_t *, conn)
+ {
+ if (conn->type != CONN_TYPE_AP)
+ continue;
+ edge_conn = TO_EDGE_CONN(conn);
+ if (!edge_conn->n_read && !edge_conn->n_written)
+ continue;
+
+ tor_gettimeofday(&now);
+ format_iso_time_nospace_usec(tbuf, &now);
+ send_control_event(EVENT_STREAM_BANDWIDTH_USED,
+ "650 STREAM_BW %"PRIu64" %lu %lu %s\r\n",
+ (edge_conn->base_.global_identifier),
+ (unsigned long)edge_conn->n_read,
+ (unsigned long)edge_conn->n_written,
+ tbuf);
+
+ edge_conn->n_written = edge_conn->n_read = 0;
+ }
+ SMARTLIST_FOREACH_END(conn);
+ }
+
+ return 0;
+}
+
+/** A second or more has elapsed: tell any interested control connections
+ * how much bandwidth origin circuits have used. */
+int
+control_event_circ_bandwidth_used(void)
+{
+ origin_circuit_t *ocirc;
+ struct timeval now;
+ char tbuf[ISO_TIME_USEC_LEN+1];
+ if (!EVENT_IS_INTERESTING(EVENT_CIRC_BANDWIDTH_USED))
+ return 0;
+
+ SMARTLIST_FOREACH_BEGIN(circuit_get_global_list(), circuit_t *, circ) {
+ if (!CIRCUIT_IS_ORIGIN(circ))
+ continue;
+ ocirc = TO_ORIGIN_CIRCUIT(circ);
+ if (!ocirc->n_read_circ_bw && !ocirc->n_written_circ_bw)
+ continue;
+ tor_gettimeofday(&now);
+ format_iso_time_nospace_usec(tbuf, &now);
+ send_control_event(EVENT_CIRC_BANDWIDTH_USED,
+ "650 CIRC_BW ID=%d READ=%lu WRITTEN=%lu TIME=%s "
+ "DELIVERED_READ=%lu OVERHEAD_READ=%lu "
+ "DELIVERED_WRITTEN=%lu OVERHEAD_WRITTEN=%lu\r\n",
+ ocirc->global_identifier,
+ (unsigned long)ocirc->n_read_circ_bw,
+ (unsigned long)ocirc->n_written_circ_bw,
+ tbuf,
+ (unsigned long)ocirc->n_delivered_read_circ_bw,
+ (unsigned long)ocirc->n_overhead_read_circ_bw,
+ (unsigned long)ocirc->n_delivered_written_circ_bw,
+ (unsigned long)ocirc->n_overhead_written_circ_bw);
+ ocirc->n_written_circ_bw = ocirc->n_read_circ_bw = 0;
+ ocirc->n_overhead_written_circ_bw = ocirc->n_overhead_read_circ_bw = 0;
+ ocirc->n_delivered_written_circ_bw = ocirc->n_delivered_read_circ_bw = 0;
+ }
+ SMARTLIST_FOREACH_END(circ);
+
+ return 0;
+}
+
+/** Print out CONN_BW event for a single OR/DIR/EXIT <b>conn</b> and reset
+ * bandwidth counters. */
+int
+control_event_conn_bandwidth(connection_t *conn)
+{
+ const char *conn_type_str;
+ if (!get_options()->TestingEnableConnBwEvent ||
+ !EVENT_IS_INTERESTING(EVENT_CONN_BW))
+ return 0;
+ if (!conn->n_read_conn_bw && !conn->n_written_conn_bw)
+ return 0;
+ switch (conn->type) {
+ case CONN_TYPE_OR:
+ conn_type_str = "OR";
+ break;
+ case CONN_TYPE_DIR:
+ conn_type_str = "DIR";
+ break;
+ case CONN_TYPE_EXIT:
+ conn_type_str = "EXIT";
+ break;
+ default:
+ return 0;
+ }
+ send_control_event(EVENT_CONN_BW,
+ "650 CONN_BW ID=%"PRIu64" TYPE=%s "
+ "READ=%lu WRITTEN=%lu\r\n",
+ (conn->global_identifier),
+ conn_type_str,
+ (unsigned long)conn->n_read_conn_bw,
+ (unsigned long)conn->n_written_conn_bw);
+ conn->n_written_conn_bw = conn->n_read_conn_bw = 0;
+ return 0;
+}
+
+/** A second or more has elapsed: tell any interested control
+ * connections how much bandwidth connections have used. */
+int
+control_event_conn_bandwidth_used(void)
+{
+ if (get_options()->TestingEnableConnBwEvent &&
+ EVENT_IS_INTERESTING(EVENT_CONN_BW)) {
+ SMARTLIST_FOREACH(get_connection_array(), connection_t *, conn,
+ control_event_conn_bandwidth(conn));
+ }
+ return 0;
+}
+
+/** Helper: iterate over cell statistics of <b>circ</b> and sum up added
+ * cells, removed cells, and waiting times by cell command and direction.
+ * Store results in <b>cell_stats</b>. Free cell statistics of the
+ * circuit afterwards. */
+void
+sum_up_cell_stats_by_command(circuit_t *circ, cell_stats_t *cell_stats)
+{
+ memset(cell_stats, 0, sizeof(cell_stats_t));
+ SMARTLIST_FOREACH_BEGIN(circ->testing_cell_stats,
+ const testing_cell_stats_entry_t *, ent) {
+ tor_assert(ent->command <= CELL_COMMAND_MAX_);
+ if (!ent->removed && !ent->exitward) {
+ cell_stats->added_cells_appward[ent->command] += 1;
+ } else if (!ent->removed && ent->exitward) {
+ cell_stats->added_cells_exitward[ent->command] += 1;
+ } else if (!ent->exitward) {
+ cell_stats->removed_cells_appward[ent->command] += 1;
+ cell_stats->total_time_appward[ent->command] += ent->waiting_time * 10;
+ } else {
+ cell_stats->removed_cells_exitward[ent->command] += 1;
+ cell_stats->total_time_exitward[ent->command] += ent->waiting_time * 10;
+ }
+ } SMARTLIST_FOREACH_END(ent);
+ circuit_clear_testing_cell_stats(circ);
+}
+
+/** Helper: append a cell statistics string to <code>event_parts</code>,
+ * prefixed with <code>key</code>=. Statistics consist of comma-separated
+ * key:value pairs with lower-case command strings as keys and cell
+ * numbers or total waiting times as values. A key:value pair is included
+ * if the entry in <code>include_if_non_zero</code> is not zero, but with
+ * the (possibly zero) entry from <code>number_to_include</code>. Both
+ * arrays are expected to have a length of CELL_COMMAND_MAX_ + 1. If no
+ * entry in <code>include_if_non_zero</code> is positive, no string will
+ * be added to <code>event_parts</code>. */
+void
+append_cell_stats_by_command(smartlist_t *event_parts, const char *key,
+ const uint64_t *include_if_non_zero,
+ const uint64_t *number_to_include)
+{
+ smartlist_t *key_value_strings = smartlist_new();
+ int i;
+ for (i = 0; i <= CELL_COMMAND_MAX_; i++) {
+ if (include_if_non_zero[i] > 0) {
+ smartlist_add_asprintf(key_value_strings, "%s:%"PRIu64,
+ cell_command_to_string(i),
+ (number_to_include[i]));
+ }
+ }
+ if (smartlist_len(key_value_strings) > 0) {
+ char *joined = smartlist_join_strings(key_value_strings, ",", 0, NULL);
+ smartlist_add_asprintf(event_parts, "%s=%s", key, joined);
+ SMARTLIST_FOREACH(key_value_strings, char *, cp, tor_free(cp));
+ tor_free(joined);
+ }
+ smartlist_free(key_value_strings);
+}
+
+/** Helper: format <b>cell_stats</b> for <b>circ</b> for inclusion in a
+ * CELL_STATS event and write result string to <b>event_string</b>. */
+void
+format_cell_stats(char **event_string, circuit_t *circ,
+ cell_stats_t *cell_stats)
+{
+ smartlist_t *event_parts = smartlist_new();
+ if (CIRCUIT_IS_ORIGIN(circ)) {
+ origin_circuit_t *ocirc = TO_ORIGIN_CIRCUIT(circ);
+ smartlist_add_asprintf(event_parts, "ID=%lu",
+ (unsigned long)ocirc->global_identifier);
+ } else if (TO_OR_CIRCUIT(circ)->p_chan) {
+ or_circuit_t *or_circ = TO_OR_CIRCUIT(circ);
+ smartlist_add_asprintf(event_parts, "InboundQueue=%lu",
+ (unsigned long)or_circ->p_circ_id);
+ smartlist_add_asprintf(event_parts, "InboundConn=%"PRIu64,
+ (or_circ->p_chan->global_identifier));
+ append_cell_stats_by_command(event_parts, "InboundAdded",
+ cell_stats->added_cells_appward,
+ cell_stats->added_cells_appward);
+ append_cell_stats_by_command(event_parts, "InboundRemoved",
+ cell_stats->removed_cells_appward,
+ cell_stats->removed_cells_appward);
+ append_cell_stats_by_command(event_parts, "InboundTime",
+ cell_stats->removed_cells_appward,
+ cell_stats->total_time_appward);
+ }
+ if (circ->n_chan) {
+ smartlist_add_asprintf(event_parts, "OutboundQueue=%lu",
+ (unsigned long)circ->n_circ_id);
+ smartlist_add_asprintf(event_parts, "OutboundConn=%"PRIu64,
+ (circ->n_chan->global_identifier));
+ append_cell_stats_by_command(event_parts, "OutboundAdded",
+ cell_stats->added_cells_exitward,
+ cell_stats->added_cells_exitward);
+ append_cell_stats_by_command(event_parts, "OutboundRemoved",
+ cell_stats->removed_cells_exitward,
+ cell_stats->removed_cells_exitward);
+ append_cell_stats_by_command(event_parts, "OutboundTime",
+ cell_stats->removed_cells_exitward,
+ cell_stats->total_time_exitward);
+ }
+ *event_string = smartlist_join_strings(event_parts, " ", 0, NULL);
+ SMARTLIST_FOREACH(event_parts, char *, cp, tor_free(cp));
+ smartlist_free(event_parts);
+}
+
+/** A second or more has elapsed: tell any interested control connection
+ * how many cells have been processed for a given circuit. */
+int
+control_event_circuit_cell_stats(void)
+{
+ cell_stats_t *cell_stats;
+ char *event_string;
+ if (!get_options()->TestingEnableCellStatsEvent ||
+ !EVENT_IS_INTERESTING(EVENT_CELL_STATS))
+ return 0;
+ cell_stats = tor_malloc(sizeof(cell_stats_t));
+ SMARTLIST_FOREACH_BEGIN(circuit_get_global_list(), circuit_t *, circ) {
+ if (!circ->testing_cell_stats)
+ continue;
+ sum_up_cell_stats_by_command(circ, cell_stats);
+ format_cell_stats(&event_string, circ, cell_stats);
+ send_control_event(EVENT_CELL_STATS,
+ "650 CELL_STATS %s\r\n", event_string);
+ tor_free(event_string);
+ }
+ SMARTLIST_FOREACH_END(circ);
+ tor_free(cell_stats);
+ return 0;
+}
+
+/* about 5 minutes worth. */
+#define N_BW_EVENTS_TO_CACHE 300
+/* Index into cached_bw_events to next write. */
+static int next_measurement_idx = 0;
+/* number of entries set in n_measurements */
+static int n_measurements = 0;
+static struct cached_bw_event_s {
+ uint32_t n_read;
+ uint32_t n_written;
+} cached_bw_events[N_BW_EVENTS_TO_CACHE];
+
+/** A second or more has elapsed: tell any interested control
+ * connections how much bandwidth we used. */
+int
+control_event_bandwidth_used(uint32_t n_read, uint32_t n_written)
+{
+ cached_bw_events[next_measurement_idx].n_read = n_read;
+ cached_bw_events[next_measurement_idx].n_written = n_written;
+ if (++next_measurement_idx == N_BW_EVENTS_TO_CACHE)
+ next_measurement_idx = 0;
+ if (n_measurements < N_BW_EVENTS_TO_CACHE)
+ ++n_measurements;
+
+ if (EVENT_IS_INTERESTING(EVENT_BANDWIDTH_USED)) {
+ send_control_event(EVENT_BANDWIDTH_USED,
+ "650 BW %lu %lu\r\n",
+ (unsigned long)n_read,
+ (unsigned long)n_written);
+ }
+
+ return 0;
+}
+
+STATIC char *
+get_bw_samples(void)
+{
+ int i;
+ int idx = (next_measurement_idx + N_BW_EVENTS_TO_CACHE - n_measurements)
+ % N_BW_EVENTS_TO_CACHE;
+ tor_assert(0 <= idx && idx < N_BW_EVENTS_TO_CACHE);
+
+ smartlist_t *elements = smartlist_new();
+
+ for (i = 0; i < n_measurements; ++i) {
+ tor_assert(0 <= idx && idx < N_BW_EVENTS_TO_CACHE);
+ const struct cached_bw_event_s *bwe = &cached_bw_events[idx];
+
+ smartlist_add_asprintf(elements, "%u,%u",
+ (unsigned)bwe->n_read,
+ (unsigned)bwe->n_written);
+
+ idx = (idx + 1) % N_BW_EVENTS_TO_CACHE;
+ }
+
+ char *result = smartlist_join_strings(elements, " ", 0, NULL);
+
+ SMARTLIST_FOREACH(elements, char *, cp, tor_free(cp));
+ smartlist_free(elements);
+
+ return result;
+}
+
+/** Called when we are sending a log message to the controllers: suspend
+ * sending further log messages to the controllers until we're done. Used by
+ * CONN_LOG_PROTECT. */
+void
+disable_control_logging(void)
+{
+ ++disable_log_messages;
+}
+
+/** We're done sending a log message to the controllers: re-enable controller
+ * logging. Used by CONN_LOG_PROTECT. */
+void
+enable_control_logging(void)
+{
+ if (--disable_log_messages < 0)
+ tor_assert(0);
+}
+
+/** We got a log message: tell any interested control connections. */
+void
+control_event_logmsg(int severity, uint32_t domain, const char *msg)
+{
+ int event;
+
+ /* Don't even think of trying to add stuff to a buffer from a cpuworker
+ * thread. (See #25987 for plan to fix.) */
+ if (! in_main_thread())
+ return;
+
+ if (disable_log_messages)
+ return;
+
+ if (domain == LD_BUG && EVENT_IS_INTERESTING(EVENT_STATUS_GENERAL) &&
+ severity <= LOG_NOTICE) {
+ char *esc = esc_for_log(msg);
+ ++disable_log_messages;
+ control_event_general_status(severity, "BUG REASON=%s", esc);
+ --disable_log_messages;
+ tor_free(esc);
+ }
+
+ event = log_severity_to_event(severity);
+ if (event >= 0 && EVENT_IS_INTERESTING(event)) {
+ char *b = NULL;
+ const char *s;
+ if (strchr(msg, '\n')) {
+ char *cp;
+ b = tor_strdup(msg);
+ for (cp = b; *cp; ++cp)
+ if (*cp == '\r' || *cp == '\n')
+ *cp = ' ';
+ }
+ switch (severity) {
+ case LOG_DEBUG: s = "DEBUG"; break;
+ case LOG_INFO: s = "INFO"; break;
+ case LOG_NOTICE: s = "NOTICE"; break;
+ case LOG_WARN: s = "WARN"; break;
+ case LOG_ERR: s = "ERR"; break;
+ default: s = "UnknownLogSeverity"; break;
+ }
+ ++disable_log_messages;
+ send_control_event(event, "650 %s %s\r\n", s, b?b:msg);
+ if (severity == LOG_ERR) {
+ /* Force a flush, since we may be about to die horribly */
+ queued_events_flush_all(1);
+ }
+ --disable_log_messages;
+ tor_free(b);
+ }
+}
+
+/**
+ * Logging callback: called when there is a queued pending log callback.
+ */
+void
+control_event_logmsg_pending(void)
+{
+ if (! in_main_thread()) {
+ /* We can't handle this case yet, since we're using a
+ * mainloop_event_t to invoke queued_events_flush_all. We ought to
+ * use a different mechanism instead: see #25987.
+ **/
+ return;
+ }
+ tor_assert(flush_queued_events_event);
+ mainloop_event_activate(flush_queued_events_event);
+}
+
+/** Called whenever we receive new router descriptors: tell any
+ * interested control connections. <b>routers</b> is a list of
+ * routerinfo_t's.
+ */
+int
+control_event_descriptors_changed(smartlist_t *routers)
+{
+ char *msg;
+
+ if (!EVENT_IS_INTERESTING(EVENT_NEW_DESC))
+ return 0;
+
+ {
+ smartlist_t *names = smartlist_new();
+ char *ids;
+ SMARTLIST_FOREACH(routers, routerinfo_t *, ri, {
+ char *b = tor_malloc(MAX_VERBOSE_NICKNAME_LEN+1);
+ router_get_verbose_nickname(b, ri);
+ smartlist_add(names, b);
+ });
+ ids = smartlist_join_strings(names, " ", 0, NULL);
+ tor_asprintf(&msg, "650 NEWDESC %s\r\n", ids);
+ send_control_event_string(EVENT_NEW_DESC, msg);
+ tor_free(ids);
+ tor_free(msg);
+ SMARTLIST_FOREACH(names, char *, cp, tor_free(cp));
+ smartlist_free(names);
+ }
+ return 0;
+}
+
+/** Called when an address mapping on <b>from</b> from changes to <b>to</b>.
+ * <b>expires</b> values less than 3 are special; see connection_edge.c. If
+ * <b>error</b> is non-NULL, it is an error code describing the failure
+ * mode of the mapping.
+ */
+int
+control_event_address_mapped(const char *from, const char *to, time_t expires,
+ const char *error, const int cached)
+{
+ if (!EVENT_IS_INTERESTING(EVENT_ADDRMAP))
+ return 0;
+
+ if (expires < 3 || expires == TIME_MAX)
+ send_control_event(EVENT_ADDRMAP,
+ "650 ADDRMAP %s %s NEVER %s%s"
+ "CACHED=\"%s\"\r\n",
+ from, to, error?error:"", error?" ":"",
+ cached?"YES":"NO");
+ else {
+ char buf[ISO_TIME_LEN+1];
+ char buf2[ISO_TIME_LEN+1];
+ format_local_iso_time(buf,expires);
+ format_iso_time(buf2,expires);
+ send_control_event(EVENT_ADDRMAP,
+ "650 ADDRMAP %s %s \"%s\""
+ " %s%sEXPIRES=\"%s\" CACHED=\"%s\"\r\n",
+ from, to, buf,
+ error?error:"", error?" ":"",
+ buf2, cached?"YES":"NO");
+ }
+
+ return 0;
+}
+
+/** Cached liveness for network liveness events and GETINFO
+ */
+
+static int network_is_live = 0;
+
+static int
+get_cached_network_liveness(void)
+{
+ return network_is_live;
+}
+
+static void
+set_cached_network_liveness(int liveness)
+{
+ network_is_live = liveness;
+}
+
+/** The network liveness has changed; this is called from circuitstats.c
+ * whenever we receive a cell, or when timeout expires and we assume the
+ * network is down. */
+int
+control_event_network_liveness_update(int liveness)
+{
+ if (liveness > 0) {
+ if (get_cached_network_liveness() <= 0) {
+ /* Update cached liveness */
+ set_cached_network_liveness(1);
+ log_debug(LD_CONTROL, "Sending NETWORK_LIVENESS UP");
+ send_control_event_string(EVENT_NETWORK_LIVENESS,
+ "650 NETWORK_LIVENESS UP\r\n");
+ }
+ /* else was already live, no-op */
+ } else {
+ if (get_cached_network_liveness() > 0) {
+ /* Update cached liveness */
+ set_cached_network_liveness(0);
+ log_debug(LD_CONTROL, "Sending NETWORK_LIVENESS DOWN");
+ send_control_event_string(EVENT_NETWORK_LIVENESS,
+ "650 NETWORK_LIVENESS DOWN\r\n");
+ }
+ /* else was already dead, no-op */
+ }
+
+ return 0;
+}
+
+/** Helper function for NS-style events. Constructs and sends an event
+ * of type <b>event</b> with string <b>event_string</b> out of the set of
+ * networkstatuses <b>statuses</b>. Currently it is used for NS events
+ * and NEWCONSENSUS events. */
+static int
+control_event_networkstatus_changed_helper(smartlist_t *statuses,
+ uint16_t event,
+ const char *event_string)
+{
+ smartlist_t *strs;
+ char *s, *esc = NULL;
+ if (!EVENT_IS_INTERESTING(event) || !smartlist_len(statuses))
+ return 0;
+
+ strs = smartlist_new();
+ smartlist_add_strdup(strs, "650+");
+ smartlist_add_strdup(strs, event_string);
+ smartlist_add_strdup(strs, "\r\n");
+ SMARTLIST_FOREACH(statuses, const routerstatus_t *, rs,
+ {
+ s = networkstatus_getinfo_helper_single(rs);
+ if (!s) continue;
+ smartlist_add(strs, s);
+ });
+
+ s = smartlist_join_strings(strs, "", 0, NULL);
+ write_escaped_data(s, strlen(s), &esc);
+ SMARTLIST_FOREACH(strs, char *, cp, tor_free(cp));
+ smartlist_free(strs);
+ tor_free(s);
+ send_control_event_string(event, esc);
+ send_control_event_string(event,
+ "650 OK\r\n");
+
+ tor_free(esc);
+ return 0;
+}
+
+/** Called when the routerstatus_ts <b>statuses</b> have changed: sends
+ * an NS event to any controller that cares. */
+int
+control_event_networkstatus_changed(smartlist_t *statuses)
+{
+ return control_event_networkstatus_changed_helper(statuses, EVENT_NS, "NS");
+}
+
+/** Called when we get a new consensus networkstatus. Sends a NEWCONSENSUS
+ * event consisting of an NS-style line for each relay in the consensus. */
+int
+control_event_newconsensus(const networkstatus_t *consensus)
+{
+ if (!control_event_is_interesting(EVENT_NEWCONSENSUS))
+ return 0;
+ return control_event_networkstatus_changed_helper(
+ consensus->routerstatus_list, EVENT_NEWCONSENSUS, "NEWCONSENSUS");
+}
+
+/** Called when we compute a new circuitbuildtimeout */
+int
+control_event_buildtimeout_set(buildtimeout_set_event_t type,
+ const char *args)
+{
+ const char *type_string = NULL;
+
+ if (!control_event_is_interesting(EVENT_BUILDTIMEOUT_SET))
+ return 0;
+
+ switch (type) {
+ case BUILDTIMEOUT_SET_EVENT_COMPUTED:
+ type_string = "COMPUTED";
+ break;
+ case BUILDTIMEOUT_SET_EVENT_RESET:
+ type_string = "RESET";
+ break;
+ case BUILDTIMEOUT_SET_EVENT_SUSPENDED:
+ type_string = "SUSPENDED";
+ break;
+ case BUILDTIMEOUT_SET_EVENT_DISCARD:
+ type_string = "DISCARD";
+ break;
+ case BUILDTIMEOUT_SET_EVENT_RESUME:
+ type_string = "RESUME";
+ break;
+ default:
+ type_string = "UNKNOWN";
+ break;
+ }
+
+ send_control_event(EVENT_BUILDTIMEOUT_SET,
+ "650 BUILDTIMEOUT_SET %s %s\r\n",
+ type_string, args);
+
+ return 0;
+}
+
+/** Called when a signal has been processed from signal_callback */
+int
+control_event_signal(uintptr_t signal_num)
+{
+ const char *signal_string = NULL;
+
+ if (!control_event_is_interesting(EVENT_GOT_SIGNAL))
+ return 0;
+
+ switch (signal_num) {
+ case SIGHUP:
+ signal_string = "RELOAD";
+ break;
+ case SIGUSR1:
+ signal_string = "DUMP";
+ break;
+ case SIGUSR2:
+ signal_string = "DEBUG";
+ break;
+ case SIGNEWNYM:
+ signal_string = "NEWNYM";
+ break;
+ case SIGCLEARDNSCACHE:
+ signal_string = "CLEARDNSCACHE";
+ break;
+ case SIGHEARTBEAT:
+ signal_string = "HEARTBEAT";
+ break;
+ default:
+ log_warn(LD_BUG, "Unrecognized signal %lu in control_event_signal",
+ (unsigned long)signal_num);
+ return -1;
+ }
+
+ send_control_event(EVENT_GOT_SIGNAL, "650 SIGNAL %s\r\n",
+ signal_string);
+ return 0;
+}
+
+/** Called when a single local_routerstatus_t has changed: Sends an NS event
+ * to any controller that cares. */
+int
+control_event_networkstatus_changed_single(const routerstatus_t *rs)
+{
+ smartlist_t *statuses;
+ int r;
+
+ if (!EVENT_IS_INTERESTING(EVENT_NS))
+ return 0;
+
+ statuses = smartlist_new();
+ smartlist_add(statuses, (void*)rs);
+ r = control_event_networkstatus_changed(statuses);
+ smartlist_free(statuses);
+ return r;
+}
+
+/** Our own router descriptor has changed; tell any controllers that care.
+ */
+int
+control_event_my_descriptor_changed(void)
+{
+ send_control_event(EVENT_DESCCHANGED, "650 DESCCHANGED\r\n");
+ return 0;
+}
+
+/** Helper: sends a status event where <b>type</b> is one of
+ * EVENT_STATUS_{GENERAL,CLIENT,SERVER}, where <b>severity</b> is one of
+ * LOG_{NOTICE,WARN,ERR}, and where <b>format</b> is a printf-style format
+ * string corresponding to <b>args</b>. */
+static int
+control_event_status(int type, int severity, const char *format, va_list args)
+{
+ char *user_buf = NULL;
+ char format_buf[160];
+ const char *status, *sev;
+
+ switch (type) {
+ case EVENT_STATUS_GENERAL:
+ status = "STATUS_GENERAL";
+ break;
+ case EVENT_STATUS_CLIENT:
+ status = "STATUS_CLIENT";
+ break;
+ case EVENT_STATUS_SERVER:
+ status = "STATUS_SERVER";
+ break;
+ default:
+ log_warn(LD_BUG, "Unrecognized status type %d", type);
+ return -1;
+ }
+ switch (severity) {
+ case LOG_NOTICE:
+ sev = "NOTICE";
+ break;
+ case LOG_WARN:
+ sev = "WARN";
+ break;
+ case LOG_ERR:
+ sev = "ERR";
+ break;
+ default:
+ log_warn(LD_BUG, "Unrecognized status severity %d", severity);
+ return -1;
+ }
+ if (tor_snprintf(format_buf, sizeof(format_buf), "650 %s %s",
+ status, sev)<0) {
+ log_warn(LD_BUG, "Format string too long.");
+ return -1;
+ }
+ tor_vasprintf(&user_buf, format, args);
+
+ send_control_event(type, "%s %s\r\n", format_buf, user_buf);
+ tor_free(user_buf);
+ return 0;
+}
+
+#define CONTROL_EVENT_STATUS_BODY(event, sev) \
+ int r; \
+ do { \
+ va_list ap; \
+ if (!EVENT_IS_INTERESTING(event)) \
+ return 0; \
+ \
+ va_start(ap, format); \
+ r = control_event_status((event), (sev), format, ap); \
+ va_end(ap); \
+ } while (0)
+
+/** Format and send an EVENT_STATUS_GENERAL event whose main text is obtained
+ * by formatting the arguments using the printf-style <b>format</b>. */
+int
+control_event_general_status(int severity, const char *format, ...)
+{
+ CONTROL_EVENT_STATUS_BODY(EVENT_STATUS_GENERAL, severity);
+ return r;
+}
+
+/** Format and send an EVENT_STATUS_GENERAL LOG_ERR event, and flush it to the
+ * controller(s) immediately. */
+int
+control_event_general_error(const char *format, ...)
+{
+ CONTROL_EVENT_STATUS_BODY(EVENT_STATUS_GENERAL, LOG_ERR);
+ /* Force a flush, since we may be about to die horribly */
+ queued_events_flush_all(1);
+ return r;
+}
+
+/** Format and send an EVENT_STATUS_CLIENT event whose main text is obtained
+ * by formatting the arguments using the printf-style <b>format</b>. */
+int
+control_event_client_status(int severity, const char *format, ...)
+{
+ CONTROL_EVENT_STATUS_BODY(EVENT_STATUS_CLIENT, severity);
+ return r;
+}
+
+/** Format and send an EVENT_STATUS_CLIENT LOG_ERR event, and flush it to the
+ * controller(s) immediately. */
+int
+control_event_client_error(const char *format, ...)
+{
+ CONTROL_EVENT_STATUS_BODY(EVENT_STATUS_CLIENT, LOG_ERR);
+ /* Force a flush, since we may be about to die horribly */
+ queued_events_flush_all(1);
+ return r;
+}
+
+/** Format and send an EVENT_STATUS_SERVER event whose main text is obtained
+ * by formatting the arguments using the printf-style <b>format</b>. */
+int
+control_event_server_status(int severity, const char *format, ...)
+{
+ CONTROL_EVENT_STATUS_BODY(EVENT_STATUS_SERVER, severity);
+ return r;
+}
+
+/** Format and send an EVENT_STATUS_SERVER LOG_ERR event, and flush it to the
+ * controller(s) immediately. */
+int
+control_event_server_error(const char *format, ...)
+{
+ CONTROL_EVENT_STATUS_BODY(EVENT_STATUS_SERVER, LOG_ERR);
+ /* Force a flush, since we may be about to die horribly */
+ queued_events_flush_all(1);
+ return r;
+}
+
+/** Called when the status of an entry guard with the given <b>nickname</b>
+ * and identity <b>digest</b> has changed to <b>status</b>: tells any
+ * controllers that care. */
+int
+control_event_guard(const char *nickname, const char *digest,
+ const char *status)
+{
+ char hbuf[HEX_DIGEST_LEN+1];
+ base16_encode(hbuf, sizeof(hbuf), digest, DIGEST_LEN);
+ if (!EVENT_IS_INTERESTING(EVENT_GUARD))
+ return 0;
+
+ {
+ char buf[MAX_VERBOSE_NICKNAME_LEN+1];
+ const node_t *node = node_get_by_id(digest);
+ if (node) {
+ node_get_verbose_nickname(node, buf);
+ } else {
+ tor_snprintf(buf, sizeof(buf), "$%s~%s", hbuf, nickname);
+ }
+ send_control_event(EVENT_GUARD,
+ "650 GUARD ENTRY %s %s\r\n", buf, status);
+ }
+ return 0;
+}
+
+/** Called when a configuration option changes. This is generally triggered
+ * by SETCONF requests and RELOAD/SIGHUP signals. The <b>elements</b> is
+ * a smartlist_t containing (key, value, ...) pairs in sequence.
+ * <b>value</b> can be NULL. */
+int
+control_event_conf_changed(const smartlist_t *elements)
+{
+ int i;
+ char *result;
+ smartlist_t *lines;
+ if (!EVENT_IS_INTERESTING(EVENT_CONF_CHANGED) ||
+ smartlist_len(elements) == 0) {
+ return 0;
+ }
+ lines = smartlist_new();
+ for (i = 0; i < smartlist_len(elements); i += 2) {
+ char *k = smartlist_get(elements, i);
+ char *v = smartlist_get(elements, i+1);
+ if (v == NULL) {
+ smartlist_add_asprintf(lines, "650-%s", k);
+ } else {
+ smartlist_add_asprintf(lines, "650-%s=%s", k, v);
+ }
+ }
+ result = smartlist_join_strings(lines, "\r\n", 0, NULL);
+ send_control_event(EVENT_CONF_CHANGED,
+ "650-CONF_CHANGED\r\n%s\r\n650 OK\r\n", result);
+ tor_free(result);
+ SMARTLIST_FOREACH(lines, char *, cp, tor_free(cp));
+ smartlist_free(lines);
+ return 0;
+}
+
+/** Helper: Return a newly allocated string containing a path to the
+ * file where we store our authentication cookie. */
+char *
+get_controller_cookie_file_name(void)
+{
+ const or_options_t *options = get_options();
+ if (options->CookieAuthFile && strlen(options->CookieAuthFile)) {
+ return tor_strdup(options->CookieAuthFile);
+ } else {
+ return get_datadir_fname("control_auth_cookie");
+ }
+}
+
+/* Initialize the cookie-based authentication system of the
+ * ControlPort. If <b>enabled</b> is 0, then disable the cookie
+ * authentication system. */
+int
+init_control_cookie_authentication(int enabled)
+{
+ char *fname = NULL;
+ int retval;
+
+ if (!enabled) {
+ authentication_cookie_is_set = 0;
+ return 0;
+ }
+
+ fname = get_controller_cookie_file_name();
+ retval = init_cookie_authentication(fname, "", /* no header */
+ AUTHENTICATION_COOKIE_LEN,
+ get_options()->CookieAuthFileGroupReadable,
+ &authentication_cookie,
+ &authentication_cookie_is_set);
+ tor_free(fname);
+ return retval;
+}
+
+/** A copy of the process specifier of Tor's owning controller, or
+ * NULL if this Tor instance is not currently owned by a process. */
+static char *owning_controller_process_spec = NULL;
+
+/** A process-termination monitor for Tor's owning controller, or NULL
+ * if this Tor instance is not currently owned by a process. */
+static tor_process_monitor_t *owning_controller_process_monitor = NULL;
+
+/** Process-termination monitor callback for Tor's owning controller
+ * process. */
+static void
+owning_controller_procmon_cb(void *unused)
+{
+ (void)unused;
+
+ lost_owning_controller("process", "vanished");
+}
+
+/** Set <b>process_spec</b> as Tor's owning controller process.
+ * Exit on failure. */
+void
+monitor_owning_controller_process(const char *process_spec)
+{
+ const char *msg;
+
+ tor_assert((owning_controller_process_spec == NULL) ==
+ (owning_controller_process_monitor == NULL));
+
+ if (owning_controller_process_spec != NULL) {
+ if ((process_spec != NULL) && !strcmp(process_spec,
+ owning_controller_process_spec)) {
+ /* Same process -- return now, instead of disposing of and
+ * recreating the process-termination monitor. */
+ return;
+ }
+
+ /* We are currently owned by a process, and we should no longer be
+ * owned by it. Free the process-termination monitor. */
+ tor_process_monitor_free(owning_controller_process_monitor);
+ owning_controller_process_monitor = NULL;
+
+ tor_free(owning_controller_process_spec);
+ owning_controller_process_spec = NULL;
+ }
+
+ tor_assert((owning_controller_process_spec == NULL) &&
+ (owning_controller_process_monitor == NULL));
+
+ if (process_spec == NULL)
+ return;
+
+ owning_controller_process_spec = tor_strdup(process_spec);
+ owning_controller_process_monitor =
+ tor_process_monitor_new(tor_libevent_get_base(),
+ owning_controller_process_spec,
+ LD_CONTROL,
+ owning_controller_procmon_cb, NULL,
+ &msg);
+
+ if (owning_controller_process_monitor == NULL) {
+ log_err(LD_BUG, "Couldn't create process-termination monitor for "
+ "owning controller: %s. Exiting.",
+ msg);
+ owning_controller_process_spec = NULL;
+ tor_shutdown_event_loop_and_exit(1);
+ }
+}
+
+/** Convert the name of a bootstrapping phase <b>s</b> into strings
+ * <b>tag</b> and <b>summary</b> suitable for display by the controller. */
+static int
+bootstrap_status_to_string(bootstrap_status_t s, const char **tag,
+ const char **summary)
+{
+ switch (s) {
+ case BOOTSTRAP_STATUS_UNDEF:
+ *tag = "undef";
+ *summary = "Undefined";
+ break;
+ case BOOTSTRAP_STATUS_STARTING:
+ *tag = "starting";
+ *summary = "Starting";
+ break;
+ case BOOTSTRAP_STATUS_CONN_DIR:
+ *tag = "conn_dir";
+ *summary = "Connecting to directory server";
+ break;
+ case BOOTSTRAP_STATUS_HANDSHAKE:
+ *tag = "status_handshake";
+ *summary = "Finishing handshake";
+ break;
+ case BOOTSTRAP_STATUS_HANDSHAKE_DIR:
+ *tag = "handshake_dir";
+ *summary = "Finishing handshake with directory server";
+ break;
+ case BOOTSTRAP_STATUS_ONEHOP_CREATE:
+ *tag = "onehop_create";
+ *summary = "Establishing an encrypted directory connection";
+ break;
+ case BOOTSTRAP_STATUS_REQUESTING_STATUS:
+ *tag = "requesting_status";
+ *summary = "Asking for networkstatus consensus";
+ break;
+ case BOOTSTRAP_STATUS_LOADING_STATUS:
+ *tag = "loading_status";
+ *summary = "Loading networkstatus consensus";
+ break;
+ case BOOTSTRAP_STATUS_LOADING_KEYS:
+ *tag = "loading_keys";
+ *summary = "Loading authority key certs";
+ break;
+ case BOOTSTRAP_STATUS_REQUESTING_DESCRIPTORS:
+ *tag = "requesting_descriptors";
+ /* XXXX this appears to incorrectly report internal on most loads */
+ *summary = router_have_consensus_path() == CONSENSUS_PATH_INTERNAL ?
+ "Asking for relay descriptors for internal paths" :
+ "Asking for relay descriptors";
+ break;
+ /* If we're sure there are no exits in the consensus,
+ * inform the controller by adding "internal"
+ * to the status summaries.
+ * (We only check this while loading descriptors,
+ * so we may not know in the earlier stages.)
+ * But if there are exits, we can't be sure whether
+ * we're creating internal or exit paths/circuits.
+ * XXXX Or should be use different tags or statuses
+ * for internal and exit/all? */
+ case BOOTSTRAP_STATUS_LOADING_DESCRIPTORS:
+ *tag = "loading_descriptors";
+ *summary = router_have_consensus_path() == CONSENSUS_PATH_INTERNAL ?
+ "Loading relay descriptors for internal paths" :
+ "Loading relay descriptors";
+ break;
+ case BOOTSTRAP_STATUS_CONN_OR:
+ *tag = "conn_or";
+ *summary = router_have_consensus_path() == CONSENSUS_PATH_INTERNAL ?
+ "Connecting to the Tor network internally" :
+ "Connecting to the Tor network";
+ break;
+ case BOOTSTRAP_STATUS_HANDSHAKE_OR:
+ *tag = "handshake_or";
+ *summary = router_have_consensus_path() == CONSENSUS_PATH_INTERNAL ?
+ "Finishing handshake with first hop of internal circuit" :
+ "Finishing handshake with first hop";
+ break;
+ case BOOTSTRAP_STATUS_CIRCUIT_CREATE:
+ *tag = "circuit_create";
+ *summary = router_have_consensus_path() == CONSENSUS_PATH_INTERNAL ?
+ "Establishing an internal Tor circuit" :
+ "Establishing a Tor circuit";
+ break;
+ case BOOTSTRAP_STATUS_DONE:
+ *tag = "done";
+ *summary = "Done";
+ break;
+ default:
+// log_warn(LD_BUG, "Unrecognized bootstrap status code %d", s);
+ *tag = *summary = "unknown";
+ return -1;
+ }
+ return 0;
+}
+
+/** What percentage through the bootstrap process are we? We remember
+ * this so we can avoid sending redundant bootstrap status events, and
+ * so we can guess context for the bootstrap messages which are
+ * ambiguous. It starts at 'undef', but gets set to 'starting' while
+ * Tor initializes. */
+static int bootstrap_percent = BOOTSTRAP_STATUS_UNDEF;
+
+/** As bootstrap_percent, but holds the bootstrapping level at which we last
+ * logged a NOTICE-level message. We use this, plus BOOTSTRAP_PCT_INCREMENT,
+ * to avoid flooding the log with a new message every time we get a few more
+ * microdescriptors */
+static int notice_bootstrap_percent = 0;
+
+/** How many problems have we had getting to the next bootstrapping phase?
+ * These include failure to establish a connection to a Tor relay,
+ * failures to finish the TLS handshake, failures to validate the
+ * consensus document, etc. */
+static int bootstrap_problems = 0;
+
+/** We only tell the controller once we've hit a threshold of problems
+ * for the current phase. */
+#define BOOTSTRAP_PROBLEM_THRESHOLD 10
+
+/** When our bootstrapping progress level changes, but our bootstrapping
+ * status has not advanced, we only log at NOTICE when we have made at least
+ * this much progress.
+ */
+#define BOOTSTRAP_PCT_INCREMENT 5
+
+/** Called when Tor has made progress at bootstrapping its directory
+ * information and initial circuits.
+ *
+ * <b>status</b> is the new status, that is, what task we will be doing
+ * next. <b>progress</b> is zero if we just started this task, else it
+ * represents progress on the task.
+ *
+ * Return true if we logged a message at level NOTICE, and false otherwise.
+ */
+int
+control_event_bootstrap(bootstrap_status_t status, int progress)
+{
+ const char *tag, *summary;
+ char buf[BOOTSTRAP_MSG_LEN];
+
+ if (bootstrap_percent == BOOTSTRAP_STATUS_DONE)
+ return 0; /* already bootstrapped; nothing to be done here. */
+
+ /* special case for handshaking status, since our TLS handshaking code
+ * can't distinguish what the connection is going to be for. */
+ if (status == BOOTSTRAP_STATUS_HANDSHAKE) {
+ if (bootstrap_percent < BOOTSTRAP_STATUS_CONN_OR) {
+ status = BOOTSTRAP_STATUS_HANDSHAKE_DIR;
+ } else {
+ status = BOOTSTRAP_STATUS_HANDSHAKE_OR;
+ }
+ }
+
+ if (status > bootstrap_percent ||
+ (progress && progress > bootstrap_percent)) {
+ int loglevel = LOG_NOTICE;
+ bootstrap_status_to_string(status, &tag, &summary);
+
+ if (status <= bootstrap_percent &&
+ (progress < notice_bootstrap_percent + BOOTSTRAP_PCT_INCREMENT)) {
+ /* We log the message at info if the status hasn't advanced, and if less
+ * than BOOTSTRAP_PCT_INCREMENT progress has been made.
+ */
+ loglevel = LOG_INFO;
+ }
+
+ tor_log(loglevel, LD_CONTROL,
+ "Bootstrapped %d%%: %s", progress ? progress : status, summary);
+ tor_snprintf(buf, sizeof(buf),
+ "BOOTSTRAP PROGRESS=%d TAG=%s SUMMARY=\"%s\"",
+ progress ? progress : status, tag, summary);
+ tor_snprintf(last_sent_bootstrap_message,
+ sizeof(last_sent_bootstrap_message),
+ "NOTICE %s", buf);
+ control_event_client_status(LOG_NOTICE, "%s", buf);
+ if (status > bootstrap_percent) {
+ bootstrap_percent = status; /* new milestone reached */
+ }
+ if (progress > bootstrap_percent) {
+ /* incremental progress within a milestone */
+ bootstrap_percent = progress;
+ bootstrap_problems = 0; /* Progress! Reset our problem counter. */
+ }
+ if (loglevel == LOG_NOTICE &&
+ bootstrap_percent > notice_bootstrap_percent) {
+ /* Remember that we gave a notice at this level. */
+ notice_bootstrap_percent = bootstrap_percent;
+ }
+ return loglevel == LOG_NOTICE;
+ }
+
+ return 0;
+}
+
+/** Called when Tor has failed to make bootstrapping progress in a way
+ * that indicates a problem. <b>warn</b> gives a human-readable hint
+ * as to why, and <b>reason</b> provides a controller-facing short
+ * tag. <b>conn</b> is the connection that caused this problem and
+ * can be NULL if a connection cannot be easily identified.
+ */
+void
+control_event_bootstrap_problem(const char *warn, const char *reason,
+ const connection_t *conn, int dowarn)
+{
+ int status = bootstrap_percent;
+ const char *tag = "", *summary = "";
+ char buf[BOOTSTRAP_MSG_LEN];
+ const char *recommendation = "ignore";
+ int severity;
+ char *or_id = NULL, *hostaddr = NULL;
+ or_connection_t *or_conn = NULL;
+
+ /* bootstrap_percent must not be in "undefined" state here. */
+ tor_assert(status >= 0);
+
+ if (bootstrap_percent == 100)
+ return; /* already bootstrapped; nothing to be done here. */
+
+ bootstrap_problems++;
+
+ if (bootstrap_problems >= BOOTSTRAP_PROBLEM_THRESHOLD)
+ dowarn = 1;
+
+ /* Don't warn about our bootstrapping status if we are hibernating or
+ * shutting down. */
+ if (we_are_hibernating())
+ dowarn = 0;
+
+ while (status>=0 && bootstrap_status_to_string(status, &tag, &summary) < 0)
+ status--; /* find a recognized status string based on current progress */
+ status = bootstrap_percent; /* set status back to the actual number */
+
+ severity = dowarn ? LOG_WARN : LOG_INFO;
+
+ if (dowarn)
+ recommendation = "warn";
+
+ if (conn && conn->type == CONN_TYPE_OR) {
+ /* XXX TO_OR_CONN can't deal with const */
+ or_conn = TO_OR_CONN((connection_t *)conn);
+ or_id = tor_strdup(hex_str(or_conn->identity_digest, DIGEST_LEN));
+ } else {
+ or_id = tor_strdup("?");
+ }
+
+ if (conn)
+ tor_asprintf(&hostaddr, "%s:%d", conn->address, (int)conn->port);
+ else
+ hostaddr = tor_strdup("?");
+
+ log_fn(severity,
+ LD_CONTROL, "Problem bootstrapping. Stuck at %d%%: %s. (%s; %s; "
+ "count %d; recommendation %s; host %s at %s)",
+ status, summary, warn, reason,
+ bootstrap_problems, recommendation,
+ or_id, hostaddr);
+
+ connection_or_report_broken_states(severity, LD_HANDSHAKE);
+
+ tor_snprintf(buf, sizeof(buf),
+ "BOOTSTRAP PROGRESS=%d TAG=%s SUMMARY=\"%s\" WARNING=\"%s\" REASON=%s "
+ "COUNT=%d RECOMMENDATION=%s HOSTID=\"%s\" HOSTADDR=\"%s\"",
+ bootstrap_percent, tag, summary, warn, reason, bootstrap_problems,
+ recommendation,
+ or_id, hostaddr);
+
+ tor_snprintf(last_sent_bootstrap_message,
+ sizeof(last_sent_bootstrap_message),
+ "WARN %s", buf);
+ control_event_client_status(LOG_WARN, "%s", buf);
+
+ tor_free(hostaddr);
+ tor_free(or_id);
+}
+
+/** Called when Tor has failed to make bootstrapping progress in a way
+ * that indicates a problem. <b>warn</b> gives a hint as to why, and
+ * <b>reason</b> provides an "or_conn_end_reason" tag. <b>or_conn</b>
+ * is the connection that caused this problem.
+ */
+MOCK_IMPL(void,
+control_event_bootstrap_prob_or, (const char *warn, int reason,
+ or_connection_t *or_conn))
+{
+ int dowarn = 0;
+
+ if (or_conn->have_noted_bootstrap_problem)
+ return;
+
+ or_conn->have_noted_bootstrap_problem = 1;
+
+ if (reason == END_OR_CONN_REASON_NO_ROUTE)
+ dowarn = 1;
+
+ /* If we are using bridges and all our OR connections are now
+ closed, it means that we totally failed to connect to our
+ bridges. Throw a warning. */
+ if (get_options()->UseBridges && !any_other_active_or_conns(or_conn))
+ dowarn = 1;
+
+ control_event_bootstrap_problem(warn,
+ orconn_end_reason_to_control_string(reason),
+ TO_CONN(or_conn), dowarn);
+}
+
+/** We just generated a new summary of which countries we've seen clients
+ * from recently. Send a copy to the controller in case it wants to
+ * display it for the user. */
+void
+control_event_clients_seen(const char *controller_str)
+{
+ send_control_event(EVENT_CLIENTS_SEEN,
+ "650 CLIENTS_SEEN %s\r\n", controller_str);
+}
+
+/** A new pluggable transport called <b>transport_name</b> was
+ * launched on <b>addr</b>:<b>port</b>. <b>mode</b> is either
+ * "server" or "client" depending on the mode of the pluggable
+ * transport.
+ * "650" SP "TRANSPORT_LAUNCHED" SP Mode SP Name SP Address SP Port
+ */
+void
+control_event_transport_launched(const char *mode, const char *transport_name,
+ tor_addr_t *addr, uint16_t port)
+{
+ send_control_event(EVENT_TRANSPORT_LAUNCHED,
+ "650 TRANSPORT_LAUNCHED %s %s %s %u\r\n",
+ mode, transport_name, fmt_addr(addr), port);
+}
+
+/** Convert rendezvous auth type to string for HS_DESC control events
+ */
+const char *
+rend_auth_type_to_string(rend_auth_type_t auth_type)
+{
+ const char *str;
+
+ switch (auth_type) {
+ case REND_NO_AUTH:
+ str = "NO_AUTH";
+ break;
+ case REND_BASIC_AUTH:
+ str = "BASIC_AUTH";
+ break;
+ case REND_STEALTH_AUTH:
+ str = "STEALTH_AUTH";
+ break;
+ default:
+ str = "UNKNOWN";
+ }
+
+ return str;
+}
+
+/** Return a longname the node whose identity is <b>id_digest</b>. If
+ * node_get_by_id() returns NULL, base 16 encoding of <b>id_digest</b> is
+ * returned instead.
+ *
+ * This function is not thread-safe. Each call to this function invalidates
+ * previous values returned by this function.
+ */
+MOCK_IMPL(const char *,
+node_describe_longname_by_id,(const char *id_digest))
+{
+ static char longname[MAX_VERBOSE_NICKNAME_LEN+1];
+ node_get_verbose_nickname_by_id(id_digest, longname);
+ return longname;
+}
+
+/** Return either the onion address if the given pointer is a non empty
+ * string else the unknown string. */
+static const char *
+rend_hsaddress_str_or_unknown(const char *onion_address)
+{
+ static const char *str_unknown = "UNKNOWN";
+ const char *str_ret = str_unknown;
+
+ /* No valid pointer, unknown it is. */
+ if (!onion_address) {
+ goto end;
+ }
+ /* Empty onion address thus we don't know, unknown it is. */
+ if (onion_address[0] == '\0') {
+ goto end;
+ }
+ /* All checks are good so return the given onion address. */
+ str_ret = onion_address;
+
+ end:
+ return str_ret;
+}
+
+/** send HS_DESC requested event.
+ *
+ * <b>rend_query</b> is used to fetch requested onion address and auth type.
+ * <b>hs_dir</b> is the description of contacting hs directory.
+ * <b>desc_id_base32</b> is the ID of requested hs descriptor.
+ * <b>hsdir_index</b> is the HSDir fetch index value for v3, an hex string.
+ */
+void
+control_event_hs_descriptor_requested(const char *onion_address,
+ rend_auth_type_t auth_type,
+ const char *id_digest,
+ const char *desc_id,
+ const char *hsdir_index)
+{
+ char *hsdir_index_field = NULL;
+
+ if (BUG(!id_digest || !desc_id)) {
+ return;
+ }
+
+ if (hsdir_index) {
+ tor_asprintf(&hsdir_index_field, " HSDIR_INDEX=%s", hsdir_index);
+ }
+
+ send_control_event(EVENT_HS_DESC,
+ "650 HS_DESC REQUESTED %s %s %s %s%s\r\n",
+ rend_hsaddress_str_or_unknown(onion_address),
+ rend_auth_type_to_string(auth_type),
+ node_describe_longname_by_id(id_digest),
+ desc_id,
+ hsdir_index_field ? hsdir_index_field : "");
+ tor_free(hsdir_index_field);
+}
+
+/** For an HS descriptor query <b>rend_data</b>, using the
+ * <b>onion_address</b> and HSDir fingerprint <b>hsdir_fp</b>, find out
+ * which descriptor ID in the query is the right one.
+ *
+ * Return a pointer of the binary descriptor ID found in the query's object
+ * or NULL if not found. */
+static const char *
+get_desc_id_from_query(const rend_data_t *rend_data, const char *hsdir_fp)
+{
+ int replica;
+ const char *desc_id = NULL;
+ const rend_data_v2_t *rend_data_v2 = TO_REND_DATA_V2(rend_data);
+
+ /* Possible if the fetch was done using a descriptor ID. This means that
+ * the HSFETCH command was used. */
+ if (!tor_digest_is_zero(rend_data_v2->desc_id_fetch)) {
+ desc_id = rend_data_v2->desc_id_fetch;
+ goto end;
+ }
+
+ /* Without a directory fingerprint at this stage, we can't do much. */
+ if (hsdir_fp == NULL) {
+ goto end;
+ }
+
+ /* OK, we have an onion address so now let's find which descriptor ID
+ * is the one associated with the HSDir fingerprint. */
+ for (replica = 0; replica < REND_NUMBER_OF_NON_CONSECUTIVE_REPLICAS;
+ replica++) {
+ const char *digest = rend_data_get_desc_id(rend_data, replica, NULL);
+
+ SMARTLIST_FOREACH_BEGIN(rend_data->hsdirs_fp, char *, fingerprint) {
+ if (tor_memcmp(fingerprint, hsdir_fp, DIGEST_LEN) == 0) {
+ /* Found it! This descriptor ID is the right one. */
+ desc_id = digest;
+ goto end;
+ }
+ } SMARTLIST_FOREACH_END(fingerprint);
+ }
+
+ end:
+ return desc_id;
+}
+
+/** send HS_DESC CREATED event when a local service generates a descriptor.
+ *
+ * <b>onion_address</b> is service address.
+ * <b>desc_id</b> is the descriptor ID.
+ * <b>replica</b> is the the descriptor replica number. If it is negative, it
+ * is ignored.
+ */
+void
+control_event_hs_descriptor_created(const char *onion_address,
+ const char *desc_id,
+ int replica)
+{
+ char *replica_field = NULL;
+
+ if (BUG(!onion_address || !desc_id)) {
+ return;
+ }
+
+ if (replica >= 0) {
+ tor_asprintf(&replica_field, " REPLICA=%d", replica);
+ }
+
+ send_control_event(EVENT_HS_DESC,
+ "650 HS_DESC CREATED %s UNKNOWN UNKNOWN %s%s\r\n",
+ onion_address, desc_id,
+ replica_field ? replica_field : "");
+ tor_free(replica_field);
+}
+
+/** send HS_DESC upload event.
+ *
+ * <b>onion_address</b> is service address.
+ * <b>hs_dir</b> is the description of contacting hs directory.
+ * <b>desc_id</b> is the ID of requested hs descriptor.
+ */
+void
+control_event_hs_descriptor_upload(const char *onion_address,
+ const char *id_digest,
+ const char *desc_id,
+ const char *hsdir_index)
+{
+ char *hsdir_index_field = NULL;
+
+ if (BUG(!onion_address || !id_digest || !desc_id)) {
+ return;
+ }
+
+ if (hsdir_index) {
+ tor_asprintf(&hsdir_index_field, " HSDIR_INDEX=%s", hsdir_index);
+ }
+
+ send_control_event(EVENT_HS_DESC,
+ "650 HS_DESC UPLOAD %s UNKNOWN %s %s%s\r\n",
+ onion_address,
+ node_describe_longname_by_id(id_digest),
+ desc_id,
+ hsdir_index_field ? hsdir_index_field : "");
+ tor_free(hsdir_index_field);
+}
+
+/** send HS_DESC event after got response from hs directory.
+ *
+ * NOTE: this is an internal function used by following functions:
+ * control_event_hsv2_descriptor_received
+ * control_event_hsv2_descriptor_failed
+ * control_event_hsv3_descriptor_failed
+ *
+ * So do not call this function directly.
+ */
+static void
+event_hs_descriptor_receive_end(const char *action,
+ const char *onion_address,
+ const char *desc_id,
+ rend_auth_type_t auth_type,
+ const char *hsdir_id_digest,
+ const char *reason)
+{
+ char *reason_field = NULL;
+
+ if (BUG(!action || !onion_address)) {
+ return;
+ }
+
+ if (reason) {
+ tor_asprintf(&reason_field, " REASON=%s", reason);
+ }
+
+ send_control_event(EVENT_HS_DESC,
+ "650 HS_DESC %s %s %s %s%s%s\r\n",
+ action,
+ rend_hsaddress_str_or_unknown(onion_address),
+ rend_auth_type_to_string(auth_type),
+ hsdir_id_digest ?
+ node_describe_longname_by_id(hsdir_id_digest) :
+ "UNKNOWN",
+ desc_id ? desc_id : "",
+ reason_field ? reason_field : "");
+
+ tor_free(reason_field);
+}
+
+/** send HS_DESC event after got response from hs directory.
+ *
+ * NOTE: this is an internal function used by following functions:
+ * control_event_hs_descriptor_uploaded
+ * control_event_hs_descriptor_upload_failed
+ *
+ * So do not call this function directly.
+ */
+void
+control_event_hs_descriptor_upload_end(const char *action,
+ const char *onion_address,
+ const char *id_digest,
+ const char *reason)
+{
+ char *reason_field = NULL;
+
+ if (BUG(!action || !id_digest)) {
+ return;
+ }
+
+ if (reason) {
+ tor_asprintf(&reason_field, " REASON=%s", reason);
+ }
+
+ send_control_event(EVENT_HS_DESC,
+ "650 HS_DESC %s %s UNKNOWN %s%s\r\n",
+ action,
+ rend_hsaddress_str_or_unknown(onion_address),
+ node_describe_longname_by_id(id_digest),
+ reason_field ? reason_field : "");
+
+ tor_free(reason_field);
+}
+
+/** send HS_DESC RECEIVED event
+ *
+ * called when we successfully received a hidden service descriptor.
+ */
+void
+control_event_hsv2_descriptor_received(const char *onion_address,
+ const rend_data_t *rend_data,
+ const char *hsdir_id_digest)
+{
+ char *desc_id_field = NULL;
+ const char *desc_id;
+
+ if (BUG(!rend_data || !hsdir_id_digest || !onion_address)) {
+ return;
+ }
+
+ desc_id = get_desc_id_from_query(rend_data, hsdir_id_digest);
+ if (desc_id != NULL) {
+ char desc_id_base32[REND_DESC_ID_V2_LEN_BASE32 + 1];
+ /* Set the descriptor ID digest to base32 so we can send it. */
+ base32_encode(desc_id_base32, sizeof(desc_id_base32), desc_id,
+ DIGEST_LEN);
+ /* Extra whitespace is needed before the value. */
+ tor_asprintf(&desc_id_field, " %s", desc_id_base32);
+ }
+
+ event_hs_descriptor_receive_end("RECEIVED", onion_address, desc_id_field,
+ TO_REND_DATA_V2(rend_data)->auth_type,
+ hsdir_id_digest, NULL);
+ tor_free(desc_id_field);
+}
+
+/* Send HS_DESC RECEIVED event
+ *
+ * Called when we successfully received a hidden service descriptor. */
+void
+control_event_hsv3_descriptor_received(const char *onion_address,
+ const char *desc_id,
+ const char *hsdir_id_digest)
+{
+ char *desc_id_field = NULL;
+
+ if (BUG(!onion_address || !desc_id || !hsdir_id_digest)) {
+ return;
+ }
+
+ /* Because DescriptorID is an optional positional value, we need to add a
+ * whitespace before in order to not be next to the HsDir value. */
+ tor_asprintf(&desc_id_field, " %s", desc_id);
+
+ event_hs_descriptor_receive_end("RECEIVED", onion_address, desc_id_field,
+ REND_NO_AUTH, hsdir_id_digest, NULL);
+ tor_free(desc_id_field);
+}
+
+/** send HS_DESC UPLOADED event
+ *
+ * called when we successfully uploaded a hidden service descriptor.
+ */
+void
+control_event_hs_descriptor_uploaded(const char *id_digest,
+ const char *onion_address)
+{
+ if (BUG(!id_digest)) {
+ return;
+ }
+
+ control_event_hs_descriptor_upload_end("UPLOADED", onion_address,
+ id_digest, NULL);
+}
+
+/** Send HS_DESC event to inform controller that query <b>rend_data</b>
+ * failed to retrieve hidden service descriptor from directory identified by
+ * <b>id_digest</b>. If NULL, "UNKNOWN" is used. If <b>reason</b> is not NULL,
+ * add it to REASON= field.
+ */
+void
+control_event_hsv2_descriptor_failed(const rend_data_t *rend_data,
+ const char *hsdir_id_digest,
+ const char *reason)
+{
+ char *desc_id_field = NULL;
+ const char *desc_id;
+
+ if (BUG(!rend_data)) {
+ return;
+ }
+
+ desc_id = get_desc_id_from_query(rend_data, hsdir_id_digest);
+ if (desc_id != NULL) {
+ char desc_id_base32[REND_DESC_ID_V2_LEN_BASE32 + 1];
+ /* Set the descriptor ID digest to base32 so we can send it. */
+ base32_encode(desc_id_base32, sizeof(desc_id_base32), desc_id,
+ DIGEST_LEN);
+ /* Extra whitespace is needed before the value. */
+ tor_asprintf(&desc_id_field, " %s", desc_id_base32);
+ }
+
+ event_hs_descriptor_receive_end("FAILED", rend_data_get_address(rend_data),
+ desc_id_field,
+ TO_REND_DATA_V2(rend_data)->auth_type,
+ hsdir_id_digest, reason);
+ tor_free(desc_id_field);
+}
+
+/** Send HS_DESC event to inform controller that the query to
+ * <b>onion_address</b> failed to retrieve hidden service descriptor
+ * <b>desc_id</b> from directory identified by <b>hsdir_id_digest</b>. If
+ * NULL, "UNKNOWN" is used. If <b>reason</b> is not NULL, add it to REASON=
+ * field. */
+void
+control_event_hsv3_descriptor_failed(const char *onion_address,
+ const char *desc_id,
+ const char *hsdir_id_digest,
+ const char *reason)
+{
+ char *desc_id_field = NULL;
+
+ if (BUG(!onion_address || !desc_id || !reason)) {
+ return;
+ }
+
+ /* Because DescriptorID is an optional positional value, we need to add a
+ * whitespace before in order to not be next to the HsDir value. */
+ tor_asprintf(&desc_id_field, " %s", desc_id);
+
+ event_hs_descriptor_receive_end("FAILED", onion_address, desc_id_field,
+ REND_NO_AUTH, hsdir_id_digest, reason);
+ tor_free(desc_id_field);
+}
+
+/** Send HS_DESC_CONTENT event after completion of a successful fetch from hs
+ * directory. If <b>hsdir_id_digest</b> is NULL, it is replaced by "UNKNOWN".
+ * If <b>content</b> is NULL, it is replaced by an empty string. The
+ * <b>onion_address</b> or <b>desc_id</b> set to NULL will no trigger the
+ * control event. */
+void
+control_event_hs_descriptor_content(const char *onion_address,
+ const char *desc_id,
+ const char *hsdir_id_digest,
+ const char *content)
+{
+ static const char *event_name = "HS_DESC_CONTENT";
+ char *esc_content = NULL;
+
+ if (!onion_address || !desc_id) {
+ log_warn(LD_BUG, "Called with onion_address==%p, desc_id==%p, ",
+ onion_address, desc_id);
+ return;
+ }
+
+ if (content == NULL) {
+ /* Point it to empty content so it can still be escaped. */
+ content = "";
+ }
+ write_escaped_data(content, strlen(content), &esc_content);
+
+ send_control_event(EVENT_HS_DESC_CONTENT,
+ "650+%s %s %s %s\r\n%s650 OK\r\n",
+ event_name,
+ rend_hsaddress_str_or_unknown(onion_address),
+ desc_id,
+ hsdir_id_digest ?
+ node_describe_longname_by_id(hsdir_id_digest) :
+ "UNKNOWN",
+ esc_content);
+ tor_free(esc_content);
+}
+
+/** Send HS_DESC event to inform controller upload of hidden service
+ * descriptor identified by <b>id_digest</b> failed. If <b>reason</b>
+ * is not NULL, add it to REASON= field.
+ */
+void
+control_event_hs_descriptor_upload_failed(const char *id_digest,
+ const char *onion_address,
+ const char *reason)
+{
+ if (BUG(!id_digest)) {
+ return;
+ }
+ control_event_hs_descriptor_upload_end("FAILED", onion_address,
+ id_digest, reason);
+}
+
+/** Free any leftover allocated memory of the control.c subsystem. */
+void
+control_free_all(void)
+{
+ smartlist_t *queued_events = NULL;
+
+ stats_prev_n_read = stats_prev_n_written = 0;
+
+ if (authentication_cookie) /* Free the auth cookie */
+ tor_free(authentication_cookie);
+ if (detached_onion_services) { /* Free the detached onion services */
+ SMARTLIST_FOREACH(detached_onion_services, char *, cp, tor_free(cp));
+ smartlist_free(detached_onion_services);
+ }
+
+ if (queued_control_events_lock) {
+ tor_mutex_acquire(queued_control_events_lock);
+ flush_queued_event_pending = 0;
+ queued_events = queued_control_events;
+ queued_control_events = NULL;
+ tor_mutex_release(queued_control_events_lock);
+ }
+ if (queued_events) {
+ SMARTLIST_FOREACH(queued_events, queued_event_t *, ev,
+ queued_event_free(ev));
+ smartlist_free(queued_events);
+ }
+ if (flush_queued_events_event) {
+ mainloop_event_free(flush_queued_events_event);
+ flush_queued_events_event = NULL;
+ }
+ bootstrap_percent = BOOTSTRAP_STATUS_UNDEF;
+ notice_bootstrap_percent = 0;
+ bootstrap_problems = 0;
+ authentication_cookie_is_set = 0;
+ global_event_mask = 0;
+ disable_log_messages = 0;
+ memset(last_sent_bootstrap_message, 0, sizeof(last_sent_bootstrap_message));
+}
+
+#ifdef TOR_UNIT_TESTS
+/* For testing: change the value of global_event_mask */
+void
+control_testing_set_global_event_mask(uint64_t mask)
+{
+ global_event_mask = mask;
+}
+#endif /* defined(TOR_UNIT_TESTS) */
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