October 2011 - tor-commits - lists.torproject.org

[tor/master] Reuse get_string_from_pipe() in log_from_pipe().
by nickm＠torproject.org 07 Oct '11

07 Oct '11

commit 69271b2a383f6fe53ed7d5ca21cc4bd89c25de17 Author: George Kadianakis <desnacked(a)gmail.com> Date: Mon Jul 18 17:06:16 2011 +0200 Reuse get_string_from_pipe() in log_from_pipe(). --- src/common/util.c | 91 +++++++++++++++++++++----------------------------- src/or/transports.c | 2 - 2 files changed, 38 insertions(+), 55 deletions(-) diff --git a/src/common/util.c b/src/common/util.c index c2db542..7a7ee19 100644 --- a/src/common/util.c +++ b/src/common/util.c @@ -3173,6 +3173,12 @@ get_string_from_pipe(FILE *stream, char *buf_out, size_t count) if (buf_out[len - 1] == '\n') { /* Remove the trailing newline */ buf_out[len - 1] = '\0'; + } else { + /* No newline; check whether we overflowed the buffer */ + if (!feof(stream)) + log_warn(LD_GENERAL, + "Line from stream was truncated: %s", buf_out); + /* TODO: What to do with this error? */ } return IO_STREAM_OKAY; @@ -3192,65 +3198,44 @@ log_from_pipe(FILE *stream, int severity, const char *executable, int *child_status) { char buf[256]; + enum stream_status r; for (;;) { - char *retval; - retval = fgets(buf, sizeof(buf), stream); - - if (NULL == retval) { - if (feof(stream)) { - /* Program has closed stream (probably it exited) */ - /* TODO: check error */ - fclose(stream); - return 1; - } else { - if (EAGAIN == errno) { - /* Nothing more to read, try again next time */ - return 0; - } else { - /* There was a problem, abandon this child process */ - fclose(stream); - return -1; - } - } - } else { - /* We have some data, log it and keep asking for more */ - size_t len; + r = get_string_from_pipe(stream, buf, sizeof(buf) - 1); - len = strlen(buf); - if (buf[len - 1] == '\n') { - /* Remove the trailing newline */ - buf[len - 1] = '\0'; - } else { - /* No newline; check whether we overflowed the buffer */ - if (!feof(stream)) - log_warn(LD_GENERAL, - "Line from port forwarding helper was truncated: %s", buf); - /* TODO: What to do with this error? */ - } + if (r == IO_STREAM_CLOSED) { + fclose(stream); + return 1; + } else if (r == IO_STREAM_EAGAIN) { + return 0; + } else if (r == IO_STREAM_TERM) { + fclose(stream); + return -1; + } - /* Check if buf starts with SPAWN_ERROR_MESSAGE */ - if (strcmpstart(buf, SPAWN_ERROR_MESSAGE) == 0) { - /* Parse error message */ - int retval, child_state, saved_errno; - retval = tor_sscanf(buf, SPAWN_ERROR_MESSAGE "%x/%x", - &child_state, &saved_errno); - if (retval == 2) { - log_warn(LD_GENERAL, - "Failed to start child process \"%s\" in state %d: %s", - executable, child_state, strerror(saved_errno)); - if (child_status) - *child_status = 1; - } else { - /* Failed to parse message from child process, log it as a - warning */ - log_warn(LD_GENERAL, - "Unexpected message from port forwarding helper \"%s\": %s", - executable, buf); - } + tor_assert(r == IO_STREAM_OKAY); + + /* Check if buf starts with SPAWN_ERROR_MESSAGE */ + if (strcmpstart(buf, SPAWN_ERROR_MESSAGE) == 0) { + /* Parse error message */ + int retval, child_state, saved_errno; + retval = tor_sscanf(buf, SPAWN_ERROR_MESSAGE "%x/%x", + &child_state, &saved_errno); + if (retval == 2) { + log_warn(LD_GENERAL, + "Failed to start child process \"%s\" in state %d: %s", + executable, child_state, strerror(saved_errno)); + if (child_status) + *child_status = 1; } else { - log_fn(severity, LD_GENERAL, "Port forwarding helper says: %s", buf); + /* Failed to parse message from child process, log it as a + warning */ + log_warn(LD_GENERAL, + "Unexpected message from port forwarding helper \"%s\": %s", + executable, buf); } + } else { + log_fn(severity, LD_GENERAL, "Port forwarding helper says: %s", buf); } } diff --git a/src/or/transports.c b/src/or/transports.c index 930cb8c..392c43d 100644 --- a/src/or/transports.c +++ b/src/or/transports.c @@ -157,8 +157,6 @@ configure_proxy(managed_proxy_t *mp) char stdout_buf[200]; while (1) { - memset(stdout_buf, 0, sizeof(stdout_buf)); - r = get_string_from_pipe(mp->stdout, stdout_buf, sizeof(stdout_buf) - 1);

1 0

[tor/master] Let's be smarter while parsing {Client, Server}TransportPlugin lines.
by nickm＠torproject.org 07 Oct '11

07 Oct '11

commit 51cdd30c01c47e3522bd49a23a83a566cf4de5a7 Author: George Kadianakis <desnacked(a)gmail.com> Date: Mon Jul 18 16:42:31 2011 +0200 Let's be smarter while parsing {Client,Server}TransportPlugin lines. --- src/or/config.c | 64 +++++++++++++++++++++++--------------------------- src/or/transports.c | 1 - 2 files changed, 29 insertions(+), 36 deletions(-) diff --git a/src/or/config.c b/src/or/config.c index da35270..02925f3 100644 --- a/src/or/config.c +++ b/src/or/config.c @@ -4702,22 +4702,25 @@ parse_client_transport_line(const char *line, int validate_only) /* managed proxy options */ int is_managed=0; char **proxy_argv=NULL; + char **tmp=NULL; + int proxy_argc,i; + + int line_length; items = smartlist_create(); smartlist_split_string(items, line, NULL, SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, -1); - if (smartlist_len(items) < 3) { + line_length = smartlist_len(items); + if (line_length < 3) { log_warn(LD_CONFIG, "Too few arguments on ClientTransportPlugin line."); goto err; } name = smartlist_get(items, 0); - smartlist_del_keeporder(items, 0); /* field2 is either a SOCKS version or "exec" */ - field2 = smartlist_get(items, 0); - smartlist_del_keeporder(items, 0); + field2 = smartlist_get(items, 1); if (!strcmp(field2,"socks4")) { socks_ver = PROXY_SOCKS4; @@ -4735,16 +4738,12 @@ parse_client_transport_line(const char *line, int validate_only) if (!validate_only) { /* if we are not just validating, use the rest of the line as the argv of the proxy to be launched */ - char **tmp; - char *tmp_arg; - proxy_argv = tor_malloc_zero(sizeof(char*)*(smartlist_len(items)+1)); + proxy_argc = line_length-2; + tor_assert(proxy_argc > 0); + proxy_argv = tor_malloc_zero(sizeof(char*)*(proxy_argc+1)); tmp = proxy_argv; - while (smartlist_len(items)) { - tmp_arg = smartlist_get(items, 0); - smartlist_del_keeporder(items, 0); - *tmp++ = tor_strdup(tmp_arg); - tor_free(tmp_arg); - } + for (i=0;i<proxy_argc;i++) /* store arguments */ + *tmp++ = smartlist_get(items, 2+i); *tmp = NULL; /*terminated with NUL pointer, just like execve() likes it*/ if (pt_managed_launch_client_proxy(name, proxy_argv) < 0) { @@ -4754,8 +4753,7 @@ parse_client_transport_line(const char *line, int validate_only) } } } else { /* external */ - addrport = smartlist_get(items, 0); - smartlist_del_keeporder(items, 0); + addrport = smartlist_get(items, 2); if (tor_addr_port_parse(addrport, &addr, &port)<0) { log_warn(LD_CONFIG, "Error parsing transport " @@ -4788,9 +4786,7 @@ parse_client_transport_line(const char *line, int validate_only) done: SMARTLIST_FOREACH(items, char*, s, tor_free(s)); smartlist_free(items); - tor_free(name); - tor_free(field2); - tor_free(addrport); + tor_free(proxy_argv); return r; } @@ -4813,21 +4809,24 @@ parse_server_transport_line(const char *line, int validate_only) /* managed proxy options */ int is_managed=0; char **proxy_argv=NULL; + char **tmp=NULL; + int proxy_argc,i; + + int line_length; items = smartlist_create(); smartlist_split_string(items, line, NULL, SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, -1); - if (smartlist_len(items) < 3) { + line_length = smartlist_len(items); + if (line_length < 3) { log_warn(LD_CONFIG, "Too few arguments on ServerTransportPlugin line."); goto err; } name = smartlist_get(items, 0); - smartlist_del_keeporder(items, 0); - type = smartlist_get(items, 0); - smartlist_del_keeporder(items, 0); + type = smartlist_get(items, 1); if (!strcmp(type, "exec")) { is_managed=1; @@ -4840,16 +4839,13 @@ parse_server_transport_line(const char *line, int validate_only) if (is_managed) { /* managed */ if (!validate_only) { - char **tmp; - char *tmp_arg; - proxy_argv = tor_malloc_zero(sizeof(char*)*(smartlist_len(items)+1)); + proxy_argc = line_length-2; + tor_assert(proxy_argc > 0); + proxy_argv = tor_malloc_zero(sizeof(char*)*(proxy_argc+1)); tmp = proxy_argv; - while (smartlist_len(items)) { - tmp_arg = smartlist_get(items, 0); - smartlist_del_keeporder(items, 0); - *tmp++ = tor_strdup(tmp_arg); - tor_free(tmp_arg); - } + + for (i=0;i<proxy_argc;i++) /* store arguments */ + *tmp++ = smartlist_get(items, 2+i); *tmp = NULL; /*terminated with NUL pointer, just like execve() likes it*/ if (pt_managed_launch_server_proxy(name, proxy_argv) < 0) { /* launch it! */ @@ -4859,8 +4855,7 @@ parse_server_transport_line(const char *line, int validate_only) } } } else { /* external */ - addrport = smartlist_get(items, 0); - smartlist_del_keeporder(items, 0); + addrport = smartlist_get(items, 2); if (tor_addr_port_parse(addrport, &addr, &port)<0) { log_warn(LD_CONFIG, "Error parsing transport " @@ -4888,8 +4883,7 @@ parse_server_transport_line(const char *line, int validate_only) done: SMARTLIST_FOREACH(items, char*, s, tor_free(s)); smartlist_free(items); - tor_free(name); - tor_free(type); + tor_free(proxy_argv); return r; } diff --git a/src/or/transports.c b/src/or/transports.c index 6589a8c..930cb8c 100644 --- a/src/or/transports.c +++ b/src/or/transports.c @@ -106,7 +106,6 @@ pt_managed_launch_proxy(const char *method, /* free the memory allocated for the execve() */ free_execve_args(envp); - free_execve_args(proxy_argv); /* Set stdout/stderr pipes to be non-blocking */ fcntl(stdout_pipe, F_SETFL, O_NONBLOCK);

1 0

[tor/master] Server transport proxies should bind on the same port each time, if possible.
by nickm＠torproject.org 07 Oct '11

07 Oct '11

commit 941709ee50654b9ef59836fadbd8c4e7029c9fc1 Author: George Kadianakis <desnacked(a)gmail.com> Date: Sun Aug 7 18:05:40 2011 +0200 Server transport proxies should bind on the same port each time, if possible. --- src/or/circuitbuild.c | 2 +- src/or/config.c | 235 +++++++++++++++++++++++++++++++++++++++++++----- src/or/config.h | 4 + src/or/or.h | 2 + src/or/transports.c | 78 ++++++++++++----- src/or/transports.h | 4 +- 6 files changed, 276 insertions(+), 49 deletions(-) diff --git a/src/or/circuitbuild.c b/src/or/circuitbuild.c index 3dba83b..fe57070 100644 --- a/src/or/circuitbuild.c +++ b/src/or/circuitbuild.c @@ -4610,7 +4610,7 @@ transport_get_by_name(const char *name) if (!transport_list) return NULL; - + SMARTLIST_FOREACH_BEGIN(transport_list, const transport_t *, transport) { if (!strcmp(transport->name, name)) return transport; diff --git a/src/or/config.c b/src/or/config.c index 02925f3..dced47c 100644 --- a/src/or/config.c +++ b/src/or/config.c @@ -473,6 +473,9 @@ static config_var_t _state_vars[] = { VAR("EntryGuardAddedBy", LINELIST_S, EntryGuards, NULL), V(EntryGuards, LINELIST_V, NULL), + VAR("TransportProxy", LINELIST_S, TransportProxies, NULL), + V(TransportProxies, LINELIST_V, NULL), + V(BWHistoryReadEnds, ISOTIME, NULL), V(BWHistoryReadInterval, UINT, "900"), V(BWHistoryReadValues, CSV, ""), @@ -499,7 +502,6 @@ static config_var_t _state_vars[] = { V(CircuitBuildAbandonedCount, UINT, "0"), VAR("CircuitBuildTimeBin", LINELIST_S, BuildtimeHistogram, NULL), VAR("BuildtimeHistogram", LINELIST_V, BuildtimeHistogram, NULL), - { NULL, CONFIG_TYPE_OBSOLETE, 0, NULL } }; @@ -1212,29 +1214,6 @@ options_act(or_options_t *old_options) if (consider_adding_dir_authorities(options, old_options) < 0) return -1; - clear_transport_list(); - if (options->ClientTransportPlugin) { - for (cl = options->ClientTransportPlugin; cl; cl = cl->next) { - if (parse_client_transport_line(cl->value, 0)<0) { - log_warn(LD_BUG, - "Previously validated ClientTransportPlugin line " - "could not be added!"); - return -1; - } - } - } - - if (options->ServerTransportPlugin) { - for (cl = options->ServerTransportPlugin; cl; cl = cl->next) { - if (parse_server_transport_line(cl->value, 0)<0) { - log_warn(LD_BUG, - "Previously validated ServerTransportPlugin line " - "could not be added!"); - return -1; - } - } - } - if (options->Bridges) { mark_bridge_list(); for (cl = options->Bridges; cl; cl = cl->next) { @@ -1271,6 +1250,30 @@ options_act(or_options_t *old_options) rep_hist_load_mtbf_data(time(NULL)); } + + clear_transport_list(); + if (options->ClientTransportPlugin) { + for (cl = options->ClientTransportPlugin; cl; cl = cl->next) { + if (parse_client_transport_line(cl->value, 0)<0) { + log_warn(LD_BUG, + "Previously validated ClientTransportPlugin line " + "could not be added!"); + return -1; + } + } + } + + if (options->ServerTransportPlugin) { + for (cl = options->ServerTransportPlugin; cl; cl = cl->next) { + if (parse_server_transport_line(cl->value, 0)<0) { + log_warn(LD_BUG, + "Previously validated ServerTransportPlugin line " + "could not be added!"); + return -1; + } + } + } + /* Bail out at this point if we're not going to be a client or server: * we want to not fork, and to log stuff to stderr. */ if (!running_tor) @@ -5465,6 +5468,74 @@ options_get_datadir_fname2_suffix(or_options_t *options, return fname; } +/** Return true if line is a valid state TransportProxy line. + * Return false otherwise. */ +static int +state_transport_line_is_valid(char *line) +{ + smartlist_t *items = NULL; + char *addrport=NULL; + tor_addr_t addr; + uint16_t port = 0; + int r; + + items = smartlist_create(); + smartlist_split_string(items, line, NULL, + SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, -1); + + if (smartlist_len(items) != 2) { + log_warn(LD_CONFIG, "state: Not enough arguments in TransportProxy line."); + goto err; + } + + addrport = smartlist_get(items, 1); + if (tor_addr_port_parse(addrport, &addr, &port) < 0) { + log_warn(LD_CONFIG, "state: Could not parse addrport."); + goto err; + } + + if (!port) { + log_warn(LD_CONFIG, "state: Transport line did not contain port."); + goto err; + } + + r = 1; + goto done; + + err: + r = 0; + + done: + SMARTLIST_FOREACH(items, char*, s, tor_free(s)); + smartlist_free(items); + return r; +} + +/** Return 0 if all TransportProxy lines in state are well + * formed. Otherwise, return -1. */ +static int +validate_transports_in_state(or_state_t *state) +{ + int broken = 0; + + config_var_t *var = config_find_option(&state_format,"TransportProxies"); + if (!var) + return 0; + + config_line_t **value = STRUCT_VAR_P(state, var->var_offset); + config_line_t *search = NULL; + + for (search = *value ; search ; search = search->next) { + if (!state_transport_line_is_valid(search->value)<0) + broken = 1; + } + + if (broken) + log_warn(LD_CONFIG, "state: State file seems to be broken."); + + return 0; +} + /** Return 0 if every setting in state is reasonable, and a * permissible transition from old_state. Else warn and return -1. * Should have no side effects, except for normalizing the contents of @@ -5483,6 +5554,9 @@ or_state_validate(or_state_t *old_state, or_state_t *state, if (entry_guards_parse_state(state, 0, msg)<0) return -1; + if (validate_transports_in_state(state)<0) + return -1; + return 0; } @@ -5715,6 +5789,118 @@ or_state_save(time_t now) return 0; } +/** Return the config line for transport transport in the current state. + * Return NULL if there is no config line for transport. */ +static config_line_t * +get_transport_in_state_by_name(const char *transport) +{ + config_var_t *var = config_find_option(&state_format,"TransportProxies"); + if (!var) + return NULL; + + config_line_t **value = STRUCT_VAR_P(get_or_state(), var->var_offset); + config_line_t *search = *value; + + while (search) { + if (!strcmpstart(search->value, transport)) + return search; + + search = search->next; + } + return NULL; +} + +/** Return string containing the address:port part of the + * TransportProxy line for transport transport. If the + * line is corrupted, return NULL. */ +const char * +get_transport_bindaddr(const char *line, const char *transport) +{ + if (strlen(line) < strlen(transport) + 2) + return NULL; + else + return (line+strlen(transport)+1); +} + +/** Return a string containing the address:port that transport + * should use. */ +const char * +get_bindaddr_for_transport(const char *transport) +{ + static const char default_addrport[] = "127.0.0.1:0"; + const char *bindaddr = NULL; + + config_line_t *line = get_transport_in_state_by_name(transport); + if (!line) + return default_addrport; + + bindaddr = get_transport_bindaddr(line->value, transport); + + return bindaddr ? bindaddr : default_addrport; +} + +/** Save transport listening at addr:port to + * state */ +void +save_transport_to_state(const char *transport, + tor_addr_t *addr, uint16_t port) +{ + or_state_t *state = get_or_state(); + + char *transport_addrport=NULL; + + /** find where to write on the state */ + config_line_t **next, *line; + + /* see if this transport is already stored in state */ + config_line_t *transport_line = + get_transport_in_state_by_name(transport); + + if (transport_line) { /* if transport_exists_in_state() */ + const char *prev_bindaddr = /* get addrport stored in state */ + get_transport_bindaddr(transport_line->value, transport); + tor_asprintf(&transport_addrport, "%s:%d", fmt_addr(addr), (int)port); + + /* if transport in state has the same address as this one, life is good */ + if (!strcmp(prev_bindaddr, transport_addrport)) { + log_warn(LD_CONFIG, "Transport seems to have spawned on its usual address:port."); + goto done; + } else { /* addrport in state is different than the one we got */ + log_warn(LD_CONFIG, "Transport seems to have spawned on different address:port." + "Let's update the state file with the new address:port"); + tor_free(transport_line->value); /* free the old line */ + tor_asprintf(&transport_line->value, "%s %s:%d", transport, + fmt_addr(addr), + (int) port); /* replace old addrport line with new line */ + } + } else { /* never seen this one before; save it in state for next time */ + log_warn(LD_CONFIG, "It's the first time we see this transport. " + "Let's save its address:port"); + next = &state->TransportProxies; + /* find the last TransportProxy line in the state and point 'next' + right after it */ + line = state->TransportProxies; + while (line) { + next = &(line->next); + line = line->next; + } + + /* allocate space for the new line and fill it in */ + *next = line = tor_malloc_zero(sizeof(config_line_t)); + line->key = tor_strdup("TransportProxy"); + tor_asprintf(&line->value, "%s %s:%d", transport, + fmt_addr(addr), (int) port); + + next = &(line->next); + } + + if (!get_options()->AvoidDiskWrites) + or_state_mark_dirty(state, 0); + + done: + tor_free(transport_addrport); +} + /** Given a file name check to see whether the file exists but has not been * modified for a very long time. If so, remove it. */ void @@ -5782,4 +5968,3 @@ getinfo_helper_config(control_connection_t *conn, } return 0; } - diff --git a/src/or/config.h b/src/or/config.h index 49f7e25..dc3a828 100644 --- a/src/or/config.h +++ b/src/or/config.h @@ -63,6 +63,10 @@ or_state_t *get_or_state(void); int did_last_state_file_write_fail(void); int or_state_save(time_t now); +void save_transport_to_state(const char *transport_name, + tor_addr_t *addr, uint16_t port); +const char * get_bindaddr_for_transport(const char *transport); + int options_need_geoip_info(or_options_t *options, const char **reason_out); int getinfo_helper_config(control_connection_t *conn, const char *question, char **answer, diff --git a/src/or/or.h b/src/or/or.h index 8bcfc82..d07422f 100644 --- a/src/or/or.h +++ b/src/or/or.h @@ -3139,6 +3139,8 @@ typedef struct { /** A list of Entry Guard-related configuration lines. */ config_line_t *EntryGuards; + config_line_t *TransportProxies; + /** These fields hold information on the history of bandwidth usage for * servers. The "Ends" fields hold the time when we last updated the * bandwidth usage. The "Interval" fields hold the granularity, in seconds, diff --git a/src/or/transports.c b/src/or/transports.c index 21d76f8..b96792f 100644 --- a/src/or/transports.c +++ b/src/or/transports.c @@ -19,10 +19,11 @@ static INLINE int proxy_configuration_finished(managed_proxy_t *mp); static void managed_proxy_destroy(managed_proxy_t *mp, int also_free_transports); -static void register_proxy_transports(managed_proxy_t *mp); static void handle_finished_proxy(managed_proxy_t *mp); static void configure_proxy(managed_proxy_t *mp); +static void register_server_proxy(managed_proxy_t *mp); + static void parse_method_error(char *line, int is_server_method); #define parse_server_method_error(l) parse_method_error(l, 1) #define parse_client_method_error(l) parse_method_error(l, 0) @@ -119,6 +120,7 @@ pt_managed_launch_proxy(const char *method, mp->conf_state = PT_PROTO_INFANT; mp->stdout = stdout_read; mp->transports = smartlist_create(); + mp->is_server = is_server; /* register the managed proxy */ if (!unconfigured_proxy_list) @@ -179,6 +181,42 @@ configure_proxy(managed_proxy_t *mp) } } +/** Register server managed proxy mp transports to state */ +static void +register_server_proxy(managed_proxy_t *mp) +{ + if (mp->is_server) { + SMARTLIST_FOREACH_BEGIN(mp->transports, transport_t *, t) { + save_transport_to_state(t->name,&t->addr,t->port); /* pass tor_addr_t? */ + } SMARTLIST_FOREACH_END(t); + } +} + +/** Register all the transports supported by client managed proxy + * mp to the bridge subsystem. */ +static void +register_client_proxy(managed_proxy_t *mp) +{ + SMARTLIST_FOREACH_BEGIN(mp->transports, transport_t *, t) { + if (transport_add(t)<0) { + log_warn(LD_GENERAL, "Could not add transport %s. Skipping.", t->name); + transport_free(t); + } else { + log_warn(LD_GENERAL, "Succesfully registered transport %s", t->name); + } + } SMARTLIST_FOREACH_END(t); +} + +/** Register the transports of managed proxy mp. */ +static INLINE void +register_proxy(managed_proxy_t *mp) +{ + if (mp->is_server) + register_server_proxy(mp); + else + register_client_proxy(mp); +} + /** Handle a configured or broken managed proxy mp. */ static void handle_finished_proxy(managed_proxy_t *mp) @@ -188,7 +226,7 @@ handle_finished_proxy(managed_proxy_t *mp) managed_proxy_destroy(mp, 1); /* destroy it and all its transports */ break; case PT_PROTO_CONFIGURED: /* if configured correctly: */ - register_proxy_transports(mp); /* register all its transports, */ + register_proxy(mp); /* register transports */ mp->conf_state = PT_PROTO_COMPLETED; /* mark it as completed, */ managed_proxy_destroy(mp, 0); /* destroy the managed proxy struct, keeping the transports intact */ @@ -203,20 +241,6 @@ handle_finished_proxy(managed_proxy_t *mp) tor_assert(n_unconfigured_proxies >= 0); } -/** Register all the transports supported by managed proxy mp. */ -static void -register_proxy_transports(managed_proxy_t *mp) -{ - SMARTLIST_FOREACH_BEGIN(mp->transports, transport_t *, t) { - if (transport_add(t)<0) { - log_warn(LD_GENERAL, "Could not add transport %s. Skipping.", t->name); - transport_free(t); - } else { - log_warn(LD_GENERAL, "Succesfully registered transport %s", t->name); - } - } SMARTLIST_FOREACH_END(t); -} - /** Free memory allocated by managed proxy mp. * If also_free_transports is set, also free the transports * associated with this managed proxy. */ @@ -254,8 +278,6 @@ proxy_configuration_finished(managed_proxy_t *mp) void handle_proxy_line(char *line, managed_proxy_t *mp) { - log_debug(LD_CONFIG, "Judging line: %s\n", line); - if (strlen(line) < SMALLEST_MANAGED_LINE_SIZE) { log_warn(LD_GENERAL, "Managed proxy configuration line is too small. " "Discarding"); @@ -401,7 +423,8 @@ parse_method_error(char *line, int is_server) line+strlen(error)+1); } -/** Parses an SMETHOD line. */ +/** Parses an SMETHOD line and if well-formed it registers the + * new transport in mp. */ int parse_smethod_line(char *line, managed_proxy_t *mp) { @@ -414,6 +437,8 @@ parse_smethod_line(char *line, managed_proxy_t *mp) tor_addr_t addr; uint16_t port = 0; + transport_t *transport=NULL; + items = smartlist_create(); smartlist_split_string(items, line, NULL, SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, -1); @@ -440,6 +465,12 @@ parse_smethod_line(char *line, managed_proxy_t *mp) goto err; } + transport = transport_create(&addr, port, method_name, PROXY_NONE); + if (!transport) + goto err; + + smartlist_add(mp->transports, transport); + /* For now, notify the user so that he knows where the server transport is listening. */ log_warn(LD_CONFIG, "Server transport %s at %s:%d.", @@ -553,23 +584,26 @@ set_environ(char ***envp, const char *method, int is_server) *envp = tor_malloc(sizeof(char*)*(n_envs+1)); tmp = *envp; + state_loc = get_datadir_fname("pt_state/"); + /* these should all be customizable */ tor_asprintf(tmp++, "HOME=%s", getenv("HOME")); tor_asprintf(tmp++, "PATH=%s", getenv("PATH")); - state_loc = get_datadir_fname("pt_state/"); tor_asprintf(tmp++, "TOR_PT_STATE_LOCATION=%s", state_loc); - tor_free(state_loc); tor_asprintf(tmp++, "TOR_PT_MANAGED_TRANSPORT_VER=1"); /* temp */ if (is_server) { /* ASN check for ORPort values, should we be here if it's 0? */ tor_asprintf(tmp++, "TOR_PT_ORPORT=127.0.0.1:%d", options->ORPort); /* temp */ - tor_asprintf(tmp++, "TOR_PT_SERVER_BINDADDR=127.0.0.1:0"); + tor_asprintf(tmp++, "TOR_PT_SERVER_BINDADDR=%s", + get_bindaddr_for_transport(method)); tor_asprintf(tmp++, "TOR_PT_SERVER_TRANSPORTS=%s", method); tor_asprintf(tmp++, "TOR_PT_EXTENDED_SERVER_PORT=127.0.0.1:4200"); /* temp*/ } else { tor_asprintf(tmp++, "TOR_PT_CLIENT_TRANSPORTS=%s", method); } *tmp = NULL; + + tor_free(state_loc); } /* ASN is this too ugly/stupid? */ diff --git a/src/or/transports.h b/src/or/transports.h index 17a6803..8bd79fe 100644 --- a/src/or/transports.h +++ b/src/or/transports.h @@ -40,10 +40,12 @@ typedef struct { enum pt_proto_state conf_state; /* the current configuration state */ int conf_protocol; /* the configuration protocol version used */ + int is_server; /* is it a server proxy? */ + FILE *stdout; /* a stream to its stdout (closed in managed_proxy_destroy()) */ - smartlist_t *transports; /* list of transports this proxy spawns */ + smartlist_t *transports; /* list of transport_t this proxy spawns */ } managed_proxy_t; int parse_cmethod_line(char *line, managed_proxy_t *mp);

1 0

[tor/master] Changed a printf() to a log_debug().
by nickm＠torproject.org 07 Oct '11

07 Oct '11

commit cfb473ed348063e1f1abd709ac313f14d33cadf5 Author: George Kadianakis <desnacked(a)gmail.com> Date: Mon Jul 18 17:08:55 2011 +0200 Changed a printf() to a log_debug(). --- src/or/transports.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/src/or/transports.c b/src/or/transports.c index 392c43d..21d76f8 100644 --- a/src/or/transports.c +++ b/src/or/transports.c @@ -254,7 +254,7 @@ proxy_configuration_finished(managed_proxy_t *mp) void handle_proxy_line(char *line, managed_proxy_t *mp) { - printf("Judging line: %s\n", line); + log_debug(LD_CONFIG, "Judging line: %s\n", line); if (strlen(line) < SMALLEST_MANAGED_LINE_SIZE) { log_warn(LD_GENERAL, "Managed proxy configuration line is too small. "

1 0

[tor/master] Replaced ST_* enum prefix for stream status with IO_STREAM_*.
by nickm＠torproject.org 07 Oct '11

07 Oct '11

commit 14c5a24fe74f7ebaf94c69721025f142d42ef1e0 Author: George Kadianakis <desnacked(a)gmail.com> Date: Mon Jul 18 02:35:29 2011 +0200 Replaced ST_* enum prefix for stream status with IO_STREAM_*. --- src/common/util.c | 18 +++++++++--------- src/common/util.h | 8 ++++---- src/or/transports.c | 6 +++--- 3 files changed, 16 insertions(+), 16 deletions(-) diff --git a/src/common/util.c b/src/common/util.c index 5f4472b..c2db542 100644 --- a/src/common/util.c +++ b/src/common/util.c @@ -3140,10 +3140,10 @@ tor_spawn_background(const char *const filename, int *stdout_read, * fits your needs before using it. * * Returns: - * ST_CLOSED: If the stream is closed. - * ST_EAGAIN: If there is nothing to read and we should check back later. - * ST_TERM: If something is wrong with the stream. - * ST_OKAY: If everything went okay and we got a string in buf_out. */ + * IO_STREAM_CLOSED: If the stream is closed. + * IO_STREAM_EAGAIN: If there is nothing to read and we should check back later. + * IO_STREAM_TERM: If something is wrong with the stream. + * IO_STREAM_OKAY: If everything went okay and we got a string in buf_out. */ enum stream_status get_string_from_pipe(FILE *stream, char *buf_out, size_t count) { @@ -3156,14 +3156,14 @@ get_string_from_pipe(FILE *stream, char *buf_out, size_t count) if (feof(stream)) { /* Program has closed stream (probably it exited) */ /* TODO: check error */ - return ST_CLOSED; + return IO_STREAM_CLOSED; } else { if (EAGAIN == errno) { /* Nothing more to read, try again next time */ - return ST_EAGAIN; + return IO_STREAM_EAGAIN; } else { /* There was a problem, abandon this child process */ - return ST_TERM; + return IO_STREAM_TERM; } } } else { @@ -3175,11 +3175,11 @@ get_string_from_pipe(FILE *stream, char *buf_out, size_t count) buf_out[len - 1] = '\0'; } - return ST_OKAY; + return IO_STREAM_OKAY; } /* We should never get here */ - return ST_TERM; + return IO_STREAM_TERM; } /** Read from stream, and send lines to log at the specified log level. diff --git a/src/common/util.h b/src/common/util.h index 1b81fa3..12dc106 100644 --- a/src/common/util.h +++ b/src/common/util.h @@ -281,10 +281,10 @@ ssize_t read_all(tor_socket_t fd, char *buf, size_t count, int isSocket); /** Status of an I/O stream. */ enum stream_status { - ST_OKAY, - ST_EAGAIN, - ST_TERM, - ST_CLOSED + IO_STREAM_OKAY, + IO_STREAM_EAGAIN, + IO_STREAM_TERM, + IO_STREAM_CLOSED }; enum stream_status get_string_from_pipe(FILE *stream, char *buf, size_t count); diff --git a/src/or/transports.c b/src/or/transports.c index aae39cd..6589a8c 100644 --- a/src/or/transports.c +++ b/src/or/transports.c @@ -163,14 +163,14 @@ configure_proxy(managed_proxy_t *mp) r = get_string_from_pipe(mp->stdout, stdout_buf, sizeof(stdout_buf) - 1); - if (r == ST_CLOSED || r == ST_TERM) { + if (r == IO_STREAM_CLOSED || r == IO_STREAM_TERM) { log_warn(LD_GENERAL, "Managed proxy stream closed. " "Most probably application stopped running"); mp->conf_state = PT_PROTO_BROKEN; - } else if (r == ST_EAGAIN) { + } else if (r == IO_STREAM_EAGAIN) { return; } else { - tor_assert(r == ST_OKAY); + tor_assert(r == IO_STREAM_OKAY); handle_proxy_line(stdout_buf, mp); }

1 0

[tor/master] Renamed pluggable_transports.[ch] to transports.[ch].
by nickm＠torproject.org 07 Oct '11

07 Oct '11

commit d8c04c7ea52bc1ffbeec60d614970eccab3c9b4f Author: George Kadianakis <desnacked(a)gmail.com> Date: Mon Jul 18 02:19:38 2011 +0200 Renamed pluggable_transports.[ch] to transports.[ch]. --- src/or/pluggable_transports.c | 613 ----------------------------------------- src/or/pluggable_transports.h | 59 ---- src/or/transports.c | 613 +++++++++++++++++++++++++++++++++++++++++ src/or/transports.h | 59 ++++ 4 files changed, 672 insertions(+), 672 deletions(-) diff --git a/src/or/pluggable_transports.c b/src/or/pluggable_transports.c deleted file mode 100644 index 49b0e13..0000000 --- a/src/or/pluggable_transports.c +++ /dev/null @@ -1,613 +0,0 @@ -/* Copyright (c) 2011, The Tor Project, Inc. */ -/* See LICENSE for licensing information */ - -/** - * \file pluggable_transports.c - * \brief Pluggable Transports related code. - **/ - -#define PT_PRIVATE -#include "or.h" -#include "config.h" -#include "circuitbuild.h" -#include "pluggable_transports.h" - -/* ASN TIDY THESE UP*/ -static void set_environ(char ***envp, const char *method, - int is_server); -static INLINE int proxy_configuration_finished(managed_proxy_t *mp); - -static void managed_proxy_destroy(managed_proxy_t *mp, - int also_free_transports); -static void register_proxy_transports(managed_proxy_t *mp); -static void handle_finished_proxy(managed_proxy_t *mp); -static void configure_proxy(managed_proxy_t *mp); - -static void parse_method_error(char *line, int is_server_method); -#define parse_server_method_error(l) parse_method_error(l, 1) -#define parse_client_method_error(l) parse_method_error(l, 0) - -static INLINE void free_execve_args(char **arg); - -/** Managed proxy protocol strings */ -#define PROTO_ENV_ERROR "ENV-ERROR" -#define PROTO_NEG_SUCCESS "VERSION" -#define PROTO_NEG_FAIL "VERSION-ERROR no-version" -#define PROTO_CMETHOD "CMETHOD" -#define PROTO_SMETHOD "SMETHOD" -#define PROTO_CMETHOD_ERROR "CMETHOD-ERROR" -#define PROTO_SMETHOD_ERROR "SMETHOD-ERROR" -#define PROTO_CMETHODS_DONE "CMETHODS DONE" -#define PROTO_SMETHODS_DONE "SMETHODS DONE" - -/* The smallest valid managed proxy protocol line that can - appear. It's the size of "VERSION 1" */ -#define SMALLEST_MANAGED_LINE_SIZE 9 - -/** Number of environment variables for managed proxy clients/servers. */ -#define ENVIRON_SIZE_CLIENT 5 -#define ENVIRON_SIZE_SERVER 8 - -/** The first and only supported - at the moment - configuration - protocol version. */ -#define PROTO_VERSION_ONE 1 - -/** List of unconfigured managed proxies. */ -static smartlist_t *unconfigured_proxy_list = NULL; -/** Number of unconfigured managed proxies. */ -static int n_unconfigured_proxies = 0; - -/* The main idea is: - - A managed proxy is represented by a managed_proxy_t struct and can - spawn multiple transports. - - unconfigured_proxy_list is a list of all the unconfigured managed - proxies; everytime we spawn a managed proxy we add it in that - list. - In every run_scheduled_event() tick, we attempt to configure each - managed proxy further, using the configuration protocol defined in - the 180_pluggable_transport.txt proposal. - - When a managed proxy is fully configured, we register all its - transports to the circuitbuild.c subsystem - like we do with - external proxies - and then free the managed proxy struct - since it's no longer needed. */ - -/** Return true if there are still unconfigured managed proxies. */ -int -pt_proxies_configuration_pending(void) -{ - return !!n_unconfigured_proxies; -} - -/** Launch a proxy for method using proxy_argv as its - * arguments. If is_server, launch a server proxy. */ -int -pt_managed_launch_proxy(const char *method, - char **proxy_argv, int is_server) -{ - char **envp=NULL; - int retval; - FILE *stdout_read = NULL; - int stdout_pipe=-1, stderr_pipe=-1; - - /* prepare the environment variables for the managed proxy */ - set_environ(&envp, method, is_server); - - /* ASN we should probably check if proxy_argv[0] is executable by our user */ - retval = tor_spawn_background(proxy_argv[0], &stdout_pipe, - &stderr_pipe, (const char **)proxy_argv, - (const char **)envp); - if (retval < 0) { - log_warn(LD_GENERAL, "Spawn failed"); - return -1; - } - - /* free the memory allocated for the execve() */ - free_execve_args(envp); - free_execve_args(proxy_argv); - - /* Set stdout/stderr pipes to be non-blocking */ - fcntl(stdout_pipe, F_SETFL, O_NONBLOCK); - /* Open the buffered IO streams */ - stdout_read = fdopen(stdout_pipe, "r"); - - log_warn(LD_CONFIG, "The spawn is alive (%d)!", retval); - - /* create a managed proxy */ - managed_proxy_t *mp = tor_malloc(sizeof(managed_proxy_t)); - mp->conf_state = PT_PROTO_INFANT; - mp->stdout = stdout_read; - mp->transports = smartlist_create(); - - /* register the managed proxy */ - if (!unconfigured_proxy_list) - unconfigured_proxy_list = smartlist_create(); - smartlist_add(unconfigured_proxy_list, mp); - - n_unconfigured_proxies++; /* ASN should we care about overflows here? - I say no. */ - - return 0; -} - -/** Check if any of the managed proxies we are currently trying to - * configure have anything new to say. This is called from - * run_scheduled_events(). */ -void -pt_configure_remaining_proxies(void) -{ - log_warn(LD_CONFIG, "We start configuring remaining managed proxies!"); - SMARTLIST_FOREACH_BEGIN(unconfigured_proxy_list, managed_proxy_t *, mp) { - if (proxy_configuration_finished(mp)) /* finished managed proxies - shouldn't be here */ - assert(0); - - configure_proxy(mp); - - } SMARTLIST_FOREACH_END(mp); -} - -/** Receive input from the managed proxy mp to get closer to - * finally configuring it. */ -static void -configure_proxy(managed_proxy_t *mp) -{ - enum stream_status r; - char stdout_buf[200]; - - while (1) { - memset(stdout_buf, 0, sizeof(stdout_buf)); - - r = get_string_from_pipe(mp->stdout, stdout_buf, - sizeof(stdout_buf) - 1); - - if (r == ST_CLOSED || r == ST_TERM) { - log_warn(LD_GENERAL, "Managed proxy stream closed. " - "Most probably application stopped running"); - mp->conf_state = PT_PROTO_BROKEN; - } else if (r == ST_EAGAIN) { - return; - } else { - tor_assert(r == ST_OKAY); - handle_proxy_line(stdout_buf, mp); - } - - /* if the proxy finished configuring, exit the loop. */ - if (proxy_configuration_finished(mp)) { - handle_finished_proxy(mp); - return; - } - } -} - -/** Handle a configured or broken managed proxy mp. */ -static void -handle_finished_proxy(managed_proxy_t *mp) -{ - switch (mp->conf_state) { - case PT_PROTO_BROKEN: /* if broken: */ - managed_proxy_destroy(mp, 1); /* destroy it and all its transports */ - break; - case PT_PROTO_CONFIGURED: /* if configured correctly: */ - register_proxy_transports(mp); /* register all its transports, */ - mp->conf_state = PT_PROTO_COMPLETED; /* mark it as completed, */ - managed_proxy_destroy(mp, 0); /* destroy the managed proxy struct, - keeping the transports intact */ - break; - default: - log_warn(LD_CONFIG, "Unfinished managed proxy in " - "handle_finished_proxy()."); - assert(0); - } - - n_unconfigured_proxies--; - tor_assert(n_unconfigured_proxies >= 0); -} - -/** Register all the transports supported by managed proxy mp. */ -static void -register_proxy_transports(managed_proxy_t *mp) -{ - SMARTLIST_FOREACH_BEGIN(mp->transports, transport_t *, t) { - if (transport_add(t)<0) { - log_warn(LD_GENERAL, "Could not add transport %s. Skipping.", t->name); - transport_free(t); - } else { - log_warn(LD_GENERAL, "Succesfully registered transport %s", t->name); - } - } SMARTLIST_FOREACH_END(t); -} - -/** Free memory allocated by managed proxy mp. - * If also_free_transports is set, also free the transports - * associated with this managed proxy. */ -static void -managed_proxy_destroy(managed_proxy_t *mp, int also_free_transports) -{ - /* transport_free() all its transports */ - if (also_free_transports) - SMARTLIST_FOREACH(mp->transports, transport_t *, t, transport_free(t)); - - /* free the transports smartlist */ - smartlist_clear(mp->transports); - smartlist_free(mp->transports); - - /* remove it from the list of managed proxies */ - smartlist_remove(unconfigured_proxy_list, mp); - - /* close its stdout stream */ - fclose(mp->stdout); - - tor_free(mp); -} - -/** Return true if the configuration of the managed proxy mp is - finished. */ -static INLINE int -proxy_configuration_finished(managed_proxy_t *mp) -{ - return (mp->conf_state == PT_PROTO_CONFIGURED || - mp->conf_state == PT_PROTO_BROKEN); -} - -/** Handle a configuration protocol line received from a - * managed proxy mp. */ -void -handle_proxy_line(char *line, managed_proxy_t *mp) -{ - printf("Judging line: %s\n", line); - - if (strlen(line) < SMALLEST_MANAGED_LINE_SIZE) { - log_warn(LD_GENERAL, "Managed proxy configuration line is too small. " - "Discarding"); - goto err; - } - - if (!strncmp(line, PROTO_ENV_ERROR, strlen(PROTO_ENV_ERROR))) { - if (mp->conf_state != PT_PROTO_INFANT) - goto err; - - parse_env_error(line); - goto err; - } else if (!strncmp(line, PROTO_NEG_FAIL, strlen(PROTO_NEG_FAIL))) { - if (mp->conf_state != PT_PROTO_INFANT) - goto err; - - log_warn(LD_CONFIG, "Managed proxy could not pick a " - "configuration protocol version."); - goto err; - } else if (!strncmp(line, PROTO_NEG_SUCCESS, - strlen(PROTO_NEG_SUCCESS))) { - if (mp->conf_state != PT_PROTO_INFANT) - goto err; - - if (parse_version(line,mp) < 0) - goto err; - - tor_assert(mp->conf_protocol != 0); - mp->conf_state = PT_PROTO_ACCEPTING_METHODS; - return; - } else if (!strncmp(line, PROTO_CMETHODS_DONE, - strlen(PROTO_CMETHODS_DONE))) { - if (mp->conf_state != PT_PROTO_ACCEPTING_METHODS) - goto err; - - log_warn(LD_CONFIG, "Client managed proxy configuration completed!"); - mp->conf_state = PT_PROTO_CONFIGURED; - return; - } else if (!strncmp(line, PROTO_SMETHODS_DONE, - strlen(PROTO_SMETHODS_DONE))) { - if (mp->conf_state != PT_PROTO_ACCEPTING_METHODS) - goto err; - - log_warn(LD_CONFIG, "Server managed proxy configuration completed!"); - mp->conf_state = PT_PROTO_CONFIGURED; - return; - } else if (!strncmp(line, PROTO_CMETHOD_ERROR, - strlen(PROTO_CMETHOD_ERROR))) { - if (mp->conf_state != PT_PROTO_ACCEPTING_METHODS) - goto err; - - parse_client_method_error(line); - goto err; - } else if (!strncmp(line, PROTO_SMETHOD_ERROR, - strlen(PROTO_SMETHOD_ERROR))) { - if (mp->conf_state != PT_PROTO_ACCEPTING_METHODS) - goto err; - - parse_server_method_error(line); - goto err; - } else if (!strncmp(line, PROTO_CMETHOD, strlen(PROTO_CMETHOD))) { - if (mp->conf_state != PT_PROTO_ACCEPTING_METHODS) - goto err; - - if (parse_cmethod_line(line, mp) < 0) - goto err; - - return; - } else if (!strncmp(line, PROTO_SMETHOD, strlen(PROTO_SMETHOD))) { - if (mp->conf_state != PT_PROTO_ACCEPTING_METHODS) - goto err; - - if (parse_smethod_line(line, mp) < 0) - goto err; - - return; - } - - log_warn(LD_CONFIG, "Unknown line received by managed proxy. (%s)", line); - - err: - mp->conf_state = PT_PROTO_BROKEN; - return; -} - -/** Parses an ENV-ERROR line and warns the user accordingly. */ -void -parse_env_error(char *line) -{ - tor_assert(!strncmp(line, PROTO_ENV_ERROR, strlen(PROTO_ENV_ERROR))); - - /* (Length of the protocol string) plus (a space) and (the first char of - the error message) */ - if (strlen(line) < (strlen(PROTO_ENV_ERROR) + 2)) - log_warn(LD_CONFIG, "Managed proxy sent us an %s without an error " - "message.", PROTO_ENV_ERROR); - - log_warn(LD_CONFIG, "Managed proxy couldn't understand the " - "pluggable transport environment variables. (%s)", - line+strlen(PROTO_ENV_ERROR)+1); -} - -/** Handles a VERSION line. Updates the configuration protocol - * version in mp. */ -int -parse_version(char *line, managed_proxy_t *mp) -{ - tor_assert(!strncmp(line, PROTO_NEG_SUCCESS, strlen(PROTO_NEG_SUCCESS))); - - if (strlen(line) < (strlen(PROTO_NEG_SUCCESS) + 2)) { - log_warn(LD_CONFIG, "Managed proxy sent us malformed %s line.", - PROTO_NEG_SUCCESS); - return -1; - } - - if (strcmp("1", line+strlen(PROTO_NEG_SUCCESS)+1)) { - log_warn(LD_CONFIG, "We don't support version '%s'. " - "We only support version '1'", line+strlen(PROTO_NEG_SUCCESS)+1); - return -1; - } - - mp->conf_protocol = PROTO_VERSION_ONE; /* temp. till more versions appear */ - return 0; -} - -/** Parses {C,S}METHOD-ERROR line and warns the user - * accordingly. If is_server it is an SMETHOD-ERROR, - * otherwise it is a CMETHOD-ERROR. */ -static void -parse_method_error(char *line, int is_server) -{ - const char* error = is_server ? - PROTO_SMETHOD_ERROR : PROTO_CMETHOD_ERROR; - - /* (Length of the protocol string) plus (a space) and (the first char of - the error message) */ - if (strlen(line) < (strlen(error) + 2)) - log_warn(LD_CONFIG, "Managed proxy sent us an %s without an error " - "message.", error); - - log_warn(LD_CONFIG, "%s managed proxy encountered a method error. (%s)", - is_server ? "Server" : "Client", - line+strlen(error)+1); -} - -/** Parses an SMETHOD line. */ -int -parse_smethod_line(char *line, managed_proxy_t *mp) -{ - int r; - smartlist_t *items = NULL; - - char *method_name=NULL; - - char *addrport=NULL; - tor_addr_t addr; - uint16_t port = 0; - - items = smartlist_create(); - smartlist_split_string(items, line, NULL, - SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, -1); - if (smartlist_len(items) < 3) { - log_warn(LD_CONFIG, "Server managed proxy sent us a SMETHOD line " - "with too few arguments."); - goto err; - } - - tor_assert(!strcmp(smartlist_get(items,0),PROTO_SMETHOD)); - - method_name = smartlist_get(items,1); - - addrport = smartlist_get(items, 2); - if (tor_addr_port_parse(addrport, &addr, &port)<0) { - log_warn(LD_CONFIG, "Error parsing transport " - "address '%s'", addrport); - goto err; - } - - if (!port) { - log_warn(LD_CONFIG, - "Transport address '%s' has no port.", addrport); - goto err; - } - - /* For now, notify the user so that he knows where the server - transport is listening. */ - log_warn(LD_CONFIG, "Server transport %s at %s:%d.", - method_name, fmt_addr(&addr), (int)port); - - r=0; - goto done; - - err: - r = -1; - - done: - SMARTLIST_FOREACH(items, char*, s, tor_free(s)); - smartlist_free(items); - return r; -} - -/** Parses a CMETHOD line, and if well-formed it registers - * the new transport in mp. */ -int -parse_cmethod_line(char *line, managed_proxy_t *mp) -{ - int r; - smartlist_t *items = NULL; - - char *method_name=NULL; - - char *socks_ver_str=NULL; - int socks_ver=PROXY_NONE; - - char *addrport=NULL; - tor_addr_t addr; - uint16_t port = 0; - - transport_t *transport=NULL; - - items = smartlist_create(); - smartlist_split_string(items, line, NULL, - SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, -1); - if (smartlist_len(items) < 4) { - log_warn(LD_CONFIG, "Client managed proxy sent us a CMETHOD line " - "with too few arguments."); - goto err; - } - - tor_assert(!strcmp(smartlist_get(items,0),PROTO_CMETHOD)); - - method_name = smartlist_get(items,1); - - socks_ver_str = smartlist_get(items,2); - - if (!strcmp(socks_ver_str,"socks4")) { - socks_ver = PROXY_SOCKS4; - } else if (!strcmp(socks_ver_str,"socks5")) { - socks_ver = PROXY_SOCKS5; - } else { - log_warn(LD_CONFIG, "Client managed proxy sent us a proxy protocol " - "we don't recognize. (%s)", socks_ver_str); - goto err; - } - - addrport = smartlist_get(items, 3); - if (tor_addr_port_parse(addrport, &addr, &port)<0) { - log_warn(LD_CONFIG, "Error parsing transport " - "address '%s'", addrport); - goto err; - } - - if (!port) { - log_warn(LD_CONFIG, - "Transport address '%s' has no port.", addrport); - goto err; - } - - transport = transport_create(&addr, port, method_name, socks_ver); - if (!transport) - goto err; - - smartlist_add(mp->transports, transport); - - log_warn(LD_CONFIG, "Transport %s at %s:%d with SOCKS %d. " - "Attached to managed proxy.", - method_name, fmt_addr(&addr), (int)port, socks_ver); - - r=0; - goto done; - - err: - r = -1; - - done: - SMARTLIST_FOREACH(items, char*, s, tor_free(s)); - smartlist_free(items); - return r; -} - -/** Prepares the envp of a pluggable transport managed proxy - * - * method is a line with transport methods to be launched. - * If is_server is set, prepare a server proxy envp. */ -static void -set_environ(char ***envp, const char *method, int is_server) -{ - or_options_t *options = get_options(); - char **tmp=NULL; - char *state_loc=NULL; - - int n_envs = is_server ? ENVIRON_SIZE_SERVER : ENVIRON_SIZE_CLIENT; - - /* allocate enough space for our env. vars and a NULL pointer */ - *envp = tor_malloc(sizeof(char*)*(n_envs+1)); - tmp = *envp; - - /* these should all be customizable */ - tor_asprintf(tmp++, "HOME=%s", getenv("HOME")); - tor_asprintf(tmp++, "PATH=%s", getenv("PATH")); - state_loc = get_datadir_fname("pt_state/"); - tor_asprintf(tmp++, "TOR_PT_STATE_LOCATION=%s", state_loc); - tor_free(state_loc); - tor_asprintf(tmp++, "TOR_PT_MANAGED_TRANSPORT_VER=1"); /* temp */ - if (is_server) { - /* ASN check for ORPort values, should we be here if it's 0? */ - tor_asprintf(tmp++, "TOR_PT_ORPORT=127.0.0.1:%d", options->ORPort); /* temp */ - tor_asprintf(tmp++, "TOR_PT_SERVER_BINDADDR=127.0.0.1:0"); - tor_asprintf(tmp++, "TOR_PT_SERVER_TRANSPORTS=%s", method); - tor_asprintf(tmp++, "TOR_PT_EXTENDED_SERVER_PORT=127.0.0.1:4200"); /* temp*/ - } else { - tor_asprintf(tmp++, "TOR_PT_CLIENT_TRANSPORTS=%s", method); - } - *tmp = NULL; -} - -/* ASN is this too ugly/stupid? */ -/** Frees the array of pointers in arg used as arguments to - execve. */ -static INLINE void -free_execve_args(char **arg) -{ - char **tmp = arg; - while (*tmp) /* use the fact that the last element of the array is a - NULL pointer to know when to stop freeing */ - _tor_free(*tmp++); - - tor_free(arg); -} - -/** Release all storage held by the pluggable transports subsystem. */ -void -pt_free_all(void) -{ - if (unconfigured_proxy_list) { - /* If the proxy is in PT_PROTO_COMPLETED, it has registered its - transports and it's the duty of the circuitbuild.c subsystem to - free them. Otherwise, it hasn't registered its transports yet - and we should free them here. */ - SMARTLIST_FOREACH_BEGIN(unconfigured_proxy_list, managed_proxy_t *, mp) { - if (mp->conf_state == PT_PROTO_COMPLETED) - managed_proxy_destroy(mp,0); - else - managed_proxy_destroy(mp,1); - } SMARTLIST_FOREACH_END(mp); - - smartlist_clear(unconfigured_proxy_list); - smartlist_free(unconfigured_proxy_list); - unconfigured_proxy_list=NULL; - } -} - diff --git a/src/or/pluggable_transports.h b/src/or/pluggable_transports.h deleted file mode 100644 index 80d5429..0000000 --- a/src/or/pluggable_transports.h +++ /dev/null @@ -1,59 +0,0 @@ -/* Copyright (c) 2003-2004, Roger Dingledine - * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson. - * Copyright (c) 2007-2011, The Tor Project, Inc. */ -/* See LICENSE for licensing information */ - -/** - * \file pluggable_transpots.h - * \brief Headers for pluggable_transpots.c - **/ - -#ifndef TOR_PLUGGABLE_TRANSPORTS_H -#define TOR_PLUGGABLE_TRANSPORTS_H - -int pt_managed_launch_proxy(const char *method, - char **proxy_argv, int is_server); - -#define pt_managed_launch_client_proxy(m, pa) \ - pt_managed_launch_proxy(m, pa, 0) -#define pt_managed_launch_server_proxy(m, pa) \ - pt_managed_launch_proxy(m, pa, 1) - -void pt_configure_remaining_proxies(void); - -int pt_proxies_configuration_pending(void); - -void pt_free_all(void); - -#ifdef PT_PRIVATE -/** State of the managed proxy configuration protocol. */ -enum pt_proto_state { - PT_PROTO_INFANT, /* was just born */ - PT_PROTO_ACCEPTING_METHODS, /* accepting methods */ - PT_PROTO_CONFIGURED, /* configured successfully */ - PT_PROTO_COMPLETED, /* configure and registered its transports */ - PT_PROTO_BROKEN -}; - -/** Structure containing information of a managed proxy. */ -typedef struct { - enum pt_proto_state conf_state; /* the current configuration state */ - int conf_protocol; /* the configuration protocol version used */ - - FILE *stdout; /* a stream to its stdout - (closed in managed_proxy_destroy()) */ - - smartlist_t *transports; /* list of transports this proxy spawns */ -} managed_proxy_t; - -int parse_cmethod_line(char *line, managed_proxy_t *mp); -int parse_smethod_line(char *line, managed_proxy_t *mp); - -int parse_version(char *line, managed_proxy_t *mp); -void parse_env_error(char *line); -void handle_proxy_line(char *line, managed_proxy_t *mp); - -#endif - -#endif - diff --git a/src/or/transports.c b/src/or/transports.c new file mode 100644 index 0000000..49b0e13 --- /dev/null +++ b/src/or/transports.c @@ -0,0 +1,613 @@ +/* Copyright (c) 2011, The Tor Project, Inc. */ +/* See LICENSE for licensing information */ + +/** + * \file pluggable_transports.c + * \brief Pluggable Transports related code. + **/ + +#define PT_PRIVATE +#include "or.h" +#include "config.h" +#include "circuitbuild.h" +#include "pluggable_transports.h" + +/* ASN TIDY THESE UP*/ +static void set_environ(char ***envp, const char *method, + int is_server); +static INLINE int proxy_configuration_finished(managed_proxy_t *mp); + +static void managed_proxy_destroy(managed_proxy_t *mp, + int also_free_transports); +static void register_proxy_transports(managed_proxy_t *mp); +static void handle_finished_proxy(managed_proxy_t *mp); +static void configure_proxy(managed_proxy_t *mp); + +static void parse_method_error(char *line, int is_server_method); +#define parse_server_method_error(l) parse_method_error(l, 1) +#define parse_client_method_error(l) parse_method_error(l, 0) + +static INLINE void free_execve_args(char **arg); + +/** Managed proxy protocol strings */ +#define PROTO_ENV_ERROR "ENV-ERROR" +#define PROTO_NEG_SUCCESS "VERSION" +#define PROTO_NEG_FAIL "VERSION-ERROR no-version" +#define PROTO_CMETHOD "CMETHOD" +#define PROTO_SMETHOD "SMETHOD" +#define PROTO_CMETHOD_ERROR "CMETHOD-ERROR" +#define PROTO_SMETHOD_ERROR "SMETHOD-ERROR" +#define PROTO_CMETHODS_DONE "CMETHODS DONE" +#define PROTO_SMETHODS_DONE "SMETHODS DONE" + +/* The smallest valid managed proxy protocol line that can + appear. It's the size of "VERSION 1" */ +#define SMALLEST_MANAGED_LINE_SIZE 9 + +/** Number of environment variables for managed proxy clients/servers. */ +#define ENVIRON_SIZE_CLIENT 5 +#define ENVIRON_SIZE_SERVER 8 + +/** The first and only supported - at the moment - configuration + protocol version. */ +#define PROTO_VERSION_ONE 1 + +/** List of unconfigured managed proxies. */ +static smartlist_t *unconfigured_proxy_list = NULL; +/** Number of unconfigured managed proxies. */ +static int n_unconfigured_proxies = 0; + +/* The main idea is: + + A managed proxy is represented by a managed_proxy_t struct and can + spawn multiple transports. + + unconfigured_proxy_list is a list of all the unconfigured managed + proxies; everytime we spawn a managed proxy we add it in that + list. + In every run_scheduled_event() tick, we attempt to configure each + managed proxy further, using the configuration protocol defined in + the 180_pluggable_transport.txt proposal. + + When a managed proxy is fully configured, we register all its + transports to the circuitbuild.c subsystem - like we do with + external proxies - and then free the managed proxy struct + since it's no longer needed. */ + +/** Return true if there are still unconfigured managed proxies. */ +int +pt_proxies_configuration_pending(void) +{ + return !!n_unconfigured_proxies; +} + +/** Launch a proxy for method using proxy_argv as its + * arguments. If is_server, launch a server proxy. */ +int +pt_managed_launch_proxy(const char *method, + char **proxy_argv, int is_server) +{ + char **envp=NULL; + int retval; + FILE *stdout_read = NULL; + int stdout_pipe=-1, stderr_pipe=-1; + + /* prepare the environment variables for the managed proxy */ + set_environ(&envp, method, is_server); + + /* ASN we should probably check if proxy_argv[0] is executable by our user */ + retval = tor_spawn_background(proxy_argv[0], &stdout_pipe, + &stderr_pipe, (const char **)proxy_argv, + (const char **)envp); + if (retval < 0) { + log_warn(LD_GENERAL, "Spawn failed"); + return -1; + } + + /* free the memory allocated for the execve() */ + free_execve_args(envp); + free_execve_args(proxy_argv); + + /* Set stdout/stderr pipes to be non-blocking */ + fcntl(stdout_pipe, F_SETFL, O_NONBLOCK); + /* Open the buffered IO streams */ + stdout_read = fdopen(stdout_pipe, "r"); + + log_warn(LD_CONFIG, "The spawn is alive (%d)!", retval); + + /* create a managed proxy */ + managed_proxy_t *mp = tor_malloc(sizeof(managed_proxy_t)); + mp->conf_state = PT_PROTO_INFANT; + mp->stdout = stdout_read; + mp->transports = smartlist_create(); + + /* register the managed proxy */ + if (!unconfigured_proxy_list) + unconfigured_proxy_list = smartlist_create(); + smartlist_add(unconfigured_proxy_list, mp); + + n_unconfigured_proxies++; /* ASN should we care about overflows here? + I say no. */ + + return 0; +} + +/** Check if any of the managed proxies we are currently trying to + * configure have anything new to say. This is called from + * run_scheduled_events(). */ +void +pt_configure_remaining_proxies(void) +{ + log_warn(LD_CONFIG, "We start configuring remaining managed proxies!"); + SMARTLIST_FOREACH_BEGIN(unconfigured_proxy_list, managed_proxy_t *, mp) { + if (proxy_configuration_finished(mp)) /* finished managed proxies + shouldn't be here */ + assert(0); + + configure_proxy(mp); + + } SMARTLIST_FOREACH_END(mp); +} + +/** Receive input from the managed proxy mp to get closer to + * finally configuring it. */ +static void +configure_proxy(managed_proxy_t *mp) +{ + enum stream_status r; + char stdout_buf[200]; + + while (1) { + memset(stdout_buf, 0, sizeof(stdout_buf)); + + r = get_string_from_pipe(mp->stdout, stdout_buf, + sizeof(stdout_buf) - 1); + + if (r == ST_CLOSED || r == ST_TERM) { + log_warn(LD_GENERAL, "Managed proxy stream closed. " + "Most probably application stopped running"); + mp->conf_state = PT_PROTO_BROKEN; + } else if (r == ST_EAGAIN) { + return; + } else { + tor_assert(r == ST_OKAY); + handle_proxy_line(stdout_buf, mp); + } + + /* if the proxy finished configuring, exit the loop. */ + if (proxy_configuration_finished(mp)) { + handle_finished_proxy(mp); + return; + } + } +} + +/** Handle a configured or broken managed proxy mp. */ +static void +handle_finished_proxy(managed_proxy_t *mp) +{ + switch (mp->conf_state) { + case PT_PROTO_BROKEN: /* if broken: */ + managed_proxy_destroy(mp, 1); /* destroy it and all its transports */ + break; + case PT_PROTO_CONFIGURED: /* if configured correctly: */ + register_proxy_transports(mp); /* register all its transports, */ + mp->conf_state = PT_PROTO_COMPLETED; /* mark it as completed, */ + managed_proxy_destroy(mp, 0); /* destroy the managed proxy struct, + keeping the transports intact */ + break; + default: + log_warn(LD_CONFIG, "Unfinished managed proxy in " + "handle_finished_proxy()."); + assert(0); + } + + n_unconfigured_proxies--; + tor_assert(n_unconfigured_proxies >= 0); +} + +/** Register all the transports supported by managed proxy mp. */ +static void +register_proxy_transports(managed_proxy_t *mp) +{ + SMARTLIST_FOREACH_BEGIN(mp->transports, transport_t *, t) { + if (transport_add(t)<0) { + log_warn(LD_GENERAL, "Could not add transport %s. Skipping.", t->name); + transport_free(t); + } else { + log_warn(LD_GENERAL, "Succesfully registered transport %s", t->name); + } + } SMARTLIST_FOREACH_END(t); +} + +/** Free memory allocated by managed proxy mp. + * If also_free_transports is set, also free the transports + * associated with this managed proxy. */ +static void +managed_proxy_destroy(managed_proxy_t *mp, int also_free_transports) +{ + /* transport_free() all its transports */ + if (also_free_transports) + SMARTLIST_FOREACH(mp->transports, transport_t *, t, transport_free(t)); + + /* free the transports smartlist */ + smartlist_clear(mp->transports); + smartlist_free(mp->transports); + + /* remove it from the list of managed proxies */ + smartlist_remove(unconfigured_proxy_list, mp); + + /* close its stdout stream */ + fclose(mp->stdout); + + tor_free(mp); +} + +/** Return true if the configuration of the managed proxy mp is + finished. */ +static INLINE int +proxy_configuration_finished(managed_proxy_t *mp) +{ + return (mp->conf_state == PT_PROTO_CONFIGURED || + mp->conf_state == PT_PROTO_BROKEN); +} + +/** Handle a configuration protocol line received from a + * managed proxy mp. */ +void +handle_proxy_line(char *line, managed_proxy_t *mp) +{ + printf("Judging line: %s\n", line); + + if (strlen(line) < SMALLEST_MANAGED_LINE_SIZE) { + log_warn(LD_GENERAL, "Managed proxy configuration line is too small. " + "Discarding"); + goto err; + } + + if (!strncmp(line, PROTO_ENV_ERROR, strlen(PROTO_ENV_ERROR))) { + if (mp->conf_state != PT_PROTO_INFANT) + goto err; + + parse_env_error(line); + goto err; + } else if (!strncmp(line, PROTO_NEG_FAIL, strlen(PROTO_NEG_FAIL))) { + if (mp->conf_state != PT_PROTO_INFANT) + goto err; + + log_warn(LD_CONFIG, "Managed proxy could not pick a " + "configuration protocol version."); + goto err; + } else if (!strncmp(line, PROTO_NEG_SUCCESS, + strlen(PROTO_NEG_SUCCESS))) { + if (mp->conf_state != PT_PROTO_INFANT) + goto err; + + if (parse_version(line,mp) < 0) + goto err; + + tor_assert(mp->conf_protocol != 0); + mp->conf_state = PT_PROTO_ACCEPTING_METHODS; + return; + } else if (!strncmp(line, PROTO_CMETHODS_DONE, + strlen(PROTO_CMETHODS_DONE))) { + if (mp->conf_state != PT_PROTO_ACCEPTING_METHODS) + goto err; + + log_warn(LD_CONFIG, "Client managed proxy configuration completed!"); + mp->conf_state = PT_PROTO_CONFIGURED; + return; + } else if (!strncmp(line, PROTO_SMETHODS_DONE, + strlen(PROTO_SMETHODS_DONE))) { + if (mp->conf_state != PT_PROTO_ACCEPTING_METHODS) + goto err; + + log_warn(LD_CONFIG, "Server managed proxy configuration completed!"); + mp->conf_state = PT_PROTO_CONFIGURED; + return; + } else if (!strncmp(line, PROTO_CMETHOD_ERROR, + strlen(PROTO_CMETHOD_ERROR))) { + if (mp->conf_state != PT_PROTO_ACCEPTING_METHODS) + goto err; + + parse_client_method_error(line); + goto err; + } else if (!strncmp(line, PROTO_SMETHOD_ERROR, + strlen(PROTO_SMETHOD_ERROR))) { + if (mp->conf_state != PT_PROTO_ACCEPTING_METHODS) + goto err; + + parse_server_method_error(line); + goto err; + } else if (!strncmp(line, PROTO_CMETHOD, strlen(PROTO_CMETHOD))) { + if (mp->conf_state != PT_PROTO_ACCEPTING_METHODS) + goto err; + + if (parse_cmethod_line(line, mp) < 0) + goto err; + + return; + } else if (!strncmp(line, PROTO_SMETHOD, strlen(PROTO_SMETHOD))) { + if (mp->conf_state != PT_PROTO_ACCEPTING_METHODS) + goto err; + + if (parse_smethod_line(line, mp) < 0) + goto err; + + return; + } + + log_warn(LD_CONFIG, "Unknown line received by managed proxy. (%s)", line); + + err: + mp->conf_state = PT_PROTO_BROKEN; + return; +} + +/** Parses an ENV-ERROR line and warns the user accordingly. */ +void +parse_env_error(char *line) +{ + tor_assert(!strncmp(line, PROTO_ENV_ERROR, strlen(PROTO_ENV_ERROR))); + + /* (Length of the protocol string) plus (a space) and (the first char of + the error message) */ + if (strlen(line) < (strlen(PROTO_ENV_ERROR) + 2)) + log_warn(LD_CONFIG, "Managed proxy sent us an %s without an error " + "message.", PROTO_ENV_ERROR); + + log_warn(LD_CONFIG, "Managed proxy couldn't understand the " + "pluggable transport environment variables. (%s)", + line+strlen(PROTO_ENV_ERROR)+1); +} + +/** Handles a VERSION line. Updates the configuration protocol + * version in mp. */ +int +parse_version(char *line, managed_proxy_t *mp) +{ + tor_assert(!strncmp(line, PROTO_NEG_SUCCESS, strlen(PROTO_NEG_SUCCESS))); + + if (strlen(line) < (strlen(PROTO_NEG_SUCCESS) + 2)) { + log_warn(LD_CONFIG, "Managed proxy sent us malformed %s line.", + PROTO_NEG_SUCCESS); + return -1; + } + + if (strcmp("1", line+strlen(PROTO_NEG_SUCCESS)+1)) { + log_warn(LD_CONFIG, "We don't support version '%s'. " + "We only support version '1'", line+strlen(PROTO_NEG_SUCCESS)+1); + return -1; + } + + mp->conf_protocol = PROTO_VERSION_ONE; /* temp. till more versions appear */ + return 0; +} + +/** Parses {C,S}METHOD-ERROR line and warns the user + * accordingly. If is_server it is an SMETHOD-ERROR, + * otherwise it is a CMETHOD-ERROR. */ +static void +parse_method_error(char *line, int is_server) +{ + const char* error = is_server ? + PROTO_SMETHOD_ERROR : PROTO_CMETHOD_ERROR; + + /* (Length of the protocol string) plus (a space) and (the first char of + the error message) */ + if (strlen(line) < (strlen(error) + 2)) + log_warn(LD_CONFIG, "Managed proxy sent us an %s without an error " + "message.", error); + + log_warn(LD_CONFIG, "%s managed proxy encountered a method error. (%s)", + is_server ? "Server" : "Client", + line+strlen(error)+1); +} + +/** Parses an SMETHOD line. */ +int +parse_smethod_line(char *line, managed_proxy_t *mp) +{ + int r; + smartlist_t *items = NULL; + + char *method_name=NULL; + + char *addrport=NULL; + tor_addr_t addr; + uint16_t port = 0; + + items = smartlist_create(); + smartlist_split_string(items, line, NULL, + SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, -1); + if (smartlist_len(items) < 3) { + log_warn(LD_CONFIG, "Server managed proxy sent us a SMETHOD line " + "with too few arguments."); + goto err; + } + + tor_assert(!strcmp(smartlist_get(items,0),PROTO_SMETHOD)); + + method_name = smartlist_get(items,1); + + addrport = smartlist_get(items, 2); + if (tor_addr_port_parse(addrport, &addr, &port)<0) { + log_warn(LD_CONFIG, "Error parsing transport " + "address '%s'", addrport); + goto err; + } + + if (!port) { + log_warn(LD_CONFIG, + "Transport address '%s' has no port.", addrport); + goto err; + } + + /* For now, notify the user so that he knows where the server + transport is listening. */ + log_warn(LD_CONFIG, "Server transport %s at %s:%d.", + method_name, fmt_addr(&addr), (int)port); + + r=0; + goto done; + + err: + r = -1; + + done: + SMARTLIST_FOREACH(items, char*, s, tor_free(s)); + smartlist_free(items); + return r; +} + +/** Parses a CMETHOD line, and if well-formed it registers + * the new transport in mp. */ +int +parse_cmethod_line(char *line, managed_proxy_t *mp) +{ + int r; + smartlist_t *items = NULL; + + char *method_name=NULL; + + char *socks_ver_str=NULL; + int socks_ver=PROXY_NONE; + + char *addrport=NULL; + tor_addr_t addr; + uint16_t port = 0; + + transport_t *transport=NULL; + + items = smartlist_create(); + smartlist_split_string(items, line, NULL, + SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, -1); + if (smartlist_len(items) < 4) { + log_warn(LD_CONFIG, "Client managed proxy sent us a CMETHOD line " + "with too few arguments."); + goto err; + } + + tor_assert(!strcmp(smartlist_get(items,0),PROTO_CMETHOD)); + + method_name = smartlist_get(items,1); + + socks_ver_str = smartlist_get(items,2); + + if (!strcmp(socks_ver_str,"socks4")) { + socks_ver = PROXY_SOCKS4; + } else if (!strcmp(socks_ver_str,"socks5")) { + socks_ver = PROXY_SOCKS5; + } else { + log_warn(LD_CONFIG, "Client managed proxy sent us a proxy protocol " + "we don't recognize. (%s)", socks_ver_str); + goto err; + } + + addrport = smartlist_get(items, 3); + if (tor_addr_port_parse(addrport, &addr, &port)<0) { + log_warn(LD_CONFIG, "Error parsing transport " + "address '%s'", addrport); + goto err; + } + + if (!port) { + log_warn(LD_CONFIG, + "Transport address '%s' has no port.", addrport); + goto err; + } + + transport = transport_create(&addr, port, method_name, socks_ver); + if (!transport) + goto err; + + smartlist_add(mp->transports, transport); + + log_warn(LD_CONFIG, "Transport %s at %s:%d with SOCKS %d. " + "Attached to managed proxy.", + method_name, fmt_addr(&addr), (int)port, socks_ver); + + r=0; + goto done; + + err: + r = -1; + + done: + SMARTLIST_FOREACH(items, char*, s, tor_free(s)); + smartlist_free(items); + return r; +} + +/** Prepares the envp of a pluggable transport managed proxy + * + * method is a line with transport methods to be launched. + * If is_server is set, prepare a server proxy envp. */ +static void +set_environ(char ***envp, const char *method, int is_server) +{ + or_options_t *options = get_options(); + char **tmp=NULL; + char *state_loc=NULL; + + int n_envs = is_server ? ENVIRON_SIZE_SERVER : ENVIRON_SIZE_CLIENT; + + /* allocate enough space for our env. vars and a NULL pointer */ + *envp = tor_malloc(sizeof(char*)*(n_envs+1)); + tmp = *envp; + + /* these should all be customizable */ + tor_asprintf(tmp++, "HOME=%s", getenv("HOME")); + tor_asprintf(tmp++, "PATH=%s", getenv("PATH")); + state_loc = get_datadir_fname("pt_state/"); + tor_asprintf(tmp++, "TOR_PT_STATE_LOCATION=%s", state_loc); + tor_free(state_loc); + tor_asprintf(tmp++, "TOR_PT_MANAGED_TRANSPORT_VER=1"); /* temp */ + if (is_server) { + /* ASN check for ORPort values, should we be here if it's 0? */ + tor_asprintf(tmp++, "TOR_PT_ORPORT=127.0.0.1:%d", options->ORPort); /* temp */ + tor_asprintf(tmp++, "TOR_PT_SERVER_BINDADDR=127.0.0.1:0"); + tor_asprintf(tmp++, "TOR_PT_SERVER_TRANSPORTS=%s", method); + tor_asprintf(tmp++, "TOR_PT_EXTENDED_SERVER_PORT=127.0.0.1:4200"); /* temp*/ + } else { + tor_asprintf(tmp++, "TOR_PT_CLIENT_TRANSPORTS=%s", method); + } + *tmp = NULL; +} + +/* ASN is this too ugly/stupid? */ +/** Frees the array of pointers in arg used as arguments to + execve. */ +static INLINE void +free_execve_args(char **arg) +{ + char **tmp = arg; + while (*tmp) /* use the fact that the last element of the array is a + NULL pointer to know when to stop freeing */ + _tor_free(*tmp++); + + tor_free(arg); +} + +/** Release all storage held by the pluggable transports subsystem. */ +void +pt_free_all(void) +{ + if (unconfigured_proxy_list) { + /* If the proxy is in PT_PROTO_COMPLETED, it has registered its + transports and it's the duty of the circuitbuild.c subsystem to + free them. Otherwise, it hasn't registered its transports yet + and we should free them here. */ + SMARTLIST_FOREACH_BEGIN(unconfigured_proxy_list, managed_proxy_t *, mp) { + if (mp->conf_state == PT_PROTO_COMPLETED) + managed_proxy_destroy(mp,0); + else + managed_proxy_destroy(mp,1); + } SMARTLIST_FOREACH_END(mp); + + smartlist_clear(unconfigured_proxy_list); + smartlist_free(unconfigured_proxy_list); + unconfigured_proxy_list=NULL; + } +} + diff --git a/src/or/transports.h b/src/or/transports.h new file mode 100644 index 0000000..80d5429 --- /dev/null +++ b/src/or/transports.h @@ -0,0 +1,59 @@ +/* Copyright (c) 2003-2004, Roger Dingledine + * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson. + * Copyright (c) 2007-2011, The Tor Project, Inc. */ +/* See LICENSE for licensing information */ + +/** + * \file pluggable_transpots.h + * \brief Headers for pluggable_transpots.c + **/ + +#ifndef TOR_PLUGGABLE_TRANSPORTS_H +#define TOR_PLUGGABLE_TRANSPORTS_H + +int pt_managed_launch_proxy(const char *method, + char **proxy_argv, int is_server); + +#define pt_managed_launch_client_proxy(m, pa) \ + pt_managed_launch_proxy(m, pa, 0) +#define pt_managed_launch_server_proxy(m, pa) \ + pt_managed_launch_proxy(m, pa, 1) + +void pt_configure_remaining_proxies(void); + +int pt_proxies_configuration_pending(void); + +void pt_free_all(void); + +#ifdef PT_PRIVATE +/** State of the managed proxy configuration protocol. */ +enum pt_proto_state { + PT_PROTO_INFANT, /* was just born */ + PT_PROTO_ACCEPTING_METHODS, /* accepting methods */ + PT_PROTO_CONFIGURED, /* configured successfully */ + PT_PROTO_COMPLETED, /* configure and registered its transports */ + PT_PROTO_BROKEN +}; + +/** Structure containing information of a managed proxy. */ +typedef struct { + enum pt_proto_state conf_state; /* the current configuration state */ + int conf_protocol; /* the configuration protocol version used */ + + FILE *stdout; /* a stream to its stdout + (closed in managed_proxy_destroy()) */ + + smartlist_t *transports; /* list of transports this proxy spawns */ +} managed_proxy_t; + +int parse_cmethod_line(char *line, managed_proxy_t *mp); +int parse_smethod_line(char *line, managed_proxy_t *mp); + +int parse_version(char *line, managed_proxy_t *mp); +void parse_env_error(char *line); +void handle_proxy_line(char *line, managed_proxy_t *mp); + +#endif + +#endif +

1 0

[tor/master] Updated #includes etc. to use transports.[ch].
by nickm＠torproject.org 07 Oct '11

07 Oct '11

commit a8f21f91cfa916b662d07dd486857fdf848c6f1d Author: George Kadianakis <desnacked(a)gmail.com> Date: Mon Jul 18 02:33:31 2011 +0200 Updated #includes etc. to use transports.[ch]. --- src/or/Makefile.am | 4 ++-- src/or/circuitbuild.c | 2 +- src/or/config.c | 2 +- src/or/main.c | 2 +- src/or/transports.c | 4 ++-- src/or/transports.h | 8 ++++---- src/test/test_pt.c | 2 +- 7 files changed, 12 insertions(+), 12 deletions(-) diff --git a/src/or/Makefile.am b/src/or/Makefile.am index 4dc5ee5..41e89d7 100644 --- a/src/or/Makefile.am +++ b/src/or/Makefile.am @@ -39,7 +39,7 @@ libtor_a_SOURCES = \ networkstatus.c \ nodelist.c \ onion.c \ - pluggable_transports.c \ + transports.c \ policies.c \ reasons.c \ relay.c \ @@ -105,7 +105,7 @@ noinst_HEADERS = \ ntmain.h \ onion.h \ or.h \ - pluggable_transports.h \ + transports.h \ policies.h \ reasons.h \ relay.h \ diff --git a/src/or/circuitbuild.c b/src/or/circuitbuild.c index 003f579..3dba83b 100644 --- a/src/or/circuitbuild.c +++ b/src/or/circuitbuild.c @@ -26,7 +26,7 @@ #include "nodelist.h" #include "onion.h" #include "policies.h" -#include "pluggable_transports.h" +#include "transports.h" #include "relay.h" #include "rephist.h" #include "router.h" diff --git a/src/or/config.c b/src/or/config.c index 5f2f11d..da35270 100644 --- a/src/or/config.c +++ b/src/or/config.c @@ -35,7 +35,7 @@ #include "router.h" #include "util.h" #include "routerlist.h" -#include "pluggable_transports.h" +#include "transports.h" #ifdef MS_WINDOWS #include <shlobj.h> #endif diff --git a/src/or/main.c b/src/or/main.c index d79d9eb..5294e4a 100644 --- a/src/or/main.c +++ b/src/or/main.c @@ -37,7 +37,7 @@ #include "ntmain.h" #include "onion.h" #include "policies.h" -#include "pluggable_transports.h" +#include "transports.h" #include "relay.h" #include "rendclient.h" #include "rendcommon.h" diff --git a/src/or/transports.c b/src/or/transports.c index 49b0e13..aae39cd 100644 --- a/src/or/transports.c +++ b/src/or/transports.c @@ -2,7 +2,7 @@ /* See LICENSE for licensing information */ /** - * \file pluggable_transports.c + * \file transports.c * \brief Pluggable Transports related code. **/ @@ -10,7 +10,7 @@ #include "or.h" #include "config.h" #include "circuitbuild.h" -#include "pluggable_transports.h" +#include "transports.h" /* ASN TIDY THESE UP*/ static void set_environ(char ***envp, const char *method, diff --git a/src/or/transports.h b/src/or/transports.h index 80d5429..17a6803 100644 --- a/src/or/transports.h +++ b/src/or/transports.h @@ -4,12 +4,12 @@ /* See LICENSE for licensing information */ /** - * \file pluggable_transpots.h - * \brief Headers for pluggable_transpots.c + * \file transports.h + * \brief Headers for transports.c **/ -#ifndef TOR_PLUGGABLE_TRANSPORTS_H -#define TOR_PLUGGABLE_TRANSPORTS_H +#ifndef TOR_TRANSPORTS_H +#define TOR_TRANSPORTS_H int pt_managed_launch_proxy(const char *method, char **proxy_argv, int is_server); diff --git a/src/test/test_pt.c b/src/test/test_pt.c index 02950b8..99fc514 100644 --- a/src/test/test_pt.c +++ b/src/test/test_pt.c @@ -6,7 +6,7 @@ #include "orconfig.h" #define PT_PRIVATE #include "or.h" -#include "pluggable_transports.h" +#include "transports.h" #include "circuitbuild.h" #include "test.h"

1 0

[tor/master] Reverting the accounting thing introduced in 5492de76 till I think how it should be done properly.
by nickm＠torproject.org 07 Oct '11

07 Oct '11

commit 86b20e0d8ac0cc87cf85e34666d6cd25a9657521 Author: George Kadianakis <desnacked(a)gmail.com> Date: Thu Jul 14 04:24:10 2011 +0200 Reverting the accounting thing introduced in 5492de76 till I think how it should be done properly. --- src/or/connection.c | 10 +++------- 1 files changed, 3 insertions(+), 7 deletions(-) diff --git a/src/or/connection.c b/src/or/connection.c index 5e8f95f..04dba2b 100644 --- a/src/or/connection.c +++ b/src/or/connection.c @@ -2080,8 +2080,6 @@ connection_is_rate_limited(connection_t *conn) or_options_t *options = get_options(); if (conn->linked) return 0; /* Internal connection */ - else if (connection_uses_transport(conn)) /* pluggable transport proxy */ - return 1; else if (! options->CountPrivateBandwidth && (tor_addr_family(&conn->addr) == AF_UNSPEC || /* no address */ tor_addr_is_internal(&conn->addr, 0))) @@ -4158,11 +4156,9 @@ int connection_uses_transport(connection_t *conn) { const transport_t *transport=NULL; - if (find_transport_by_bridge_addrport(&conn->addr, - conn->port,&transport) == 0) - return 1; - else - return 0; + find_transport_by_bridge_addrport(&conn->addr, + conn->port,&transport); + return transport ? 1 : 0; } /** Returns the global proxy type used by tor. */

1 0

[tor/master] Make some utility functions.
by nickm＠torproject.org 07 Oct '11

07 Oct '11

commit 810a7a5fa0973451881a874a08594937a8274429 Author: George Kadianakis <desnacked(a)gmail.com> Date: Wed Jul 13 18:59:52 2011 +0200 Make some utility functions. * Create a function that will get input from a stream, so that we can communicate with the managed proxy. * Hackish change to tor_spawn_background() so that we can specify an environ for our spawn. --- src/common/util.c | 60 +++++++++++++++++++++++++++++++++++++++++++++++-- src/common/util.h | 16 +++++++++++- src/test/test_util.c | 3 +- 3 files changed, 73 insertions(+), 6 deletions(-) diff --git a/src/common/util.c b/src/common/util.c index a5a6ea3..5f4472b 100644 --- a/src/common/util.c +++ b/src/common/util.c @@ -2958,7 +2958,7 @@ format_helper_exit_status(unsigned char child_state, int saved_errno, */ int tor_spawn_background(const char *const filename, int *stdout_read, - int *stderr_read, const char **argv) + int *stderr_read, const char **argv, const char **envp) { #ifdef MS_WINDOWS (void) filename; (void) stdout_read; (void) stderr_read; (void) argv; @@ -3068,7 +3068,10 @@ tor_spawn_background(const char *const filename, int *stdout_read, /* Call the requested program. We need the cast because execvp doesn't define argv as const, even though it does not modify the arguments */ - execvp(filename, (char *const *) argv); + if (envp) + execve(filename, (char *const *) argv, (char*const*)envp); + else + execvp(filename, (char *const *) argv); /* If we got here, the exec or open(/dev/null) failed */ @@ -3128,6 +3131,57 @@ tor_spawn_background(const char *const filename, int *stdout_read, #endif } +/** Reads from stream and stores input in buf_out making + * sure it's below count bytes. + * If the string has a trailing newline, we strip it off. + * + * This function is specifically created to handle input from managed + * proxies, according to the pluggable transports spec. Make sure it + * fits your needs before using it. + * + * Returns: + * ST_CLOSED: If the stream is closed. + * ST_EAGAIN: If there is nothing to read and we should check back later. + * ST_TERM: If something is wrong with the stream. + * ST_OKAY: If everything went okay and we got a string in buf_out. */ +enum stream_status +get_string_from_pipe(FILE *stream, char *buf_out, size_t count) +{ + char *retval; + size_t len; + + retval = fgets(buf_out, count, stream); + + if (!retval) { + if (feof(stream)) { + /* Program has closed stream (probably it exited) */ + /* TODO: check error */ + return ST_CLOSED; + } else { + if (EAGAIN == errno) { + /* Nothing more to read, try again next time */ + return ST_EAGAIN; + } else { + /* There was a problem, abandon this child process */ + return ST_TERM; + } + } + } else { + len = strlen(buf_out); + tor_assert(len>0); + + if (buf_out[len - 1] == '\n') { + /* Remove the trailing newline */ + buf_out[len - 1] = '\0'; + } + + return ST_OKAY; + } + + /* We should never get here */ + return ST_TERM; +} + /** Read from stream, and send lines to log at the specified log level. * Returns 1 if stream is closed normally, -1 if there is a error reading, and * 0 otherwise. Handles lines from tor-fw-helper and @@ -3254,7 +3308,7 @@ tor_check_port_forwarding(const char *filename, int dir_port, int or_port, /* Assume tor-fw-helper will succeed, start it later*/ time_to_run_helper = now + TIME_TO_EXEC_FWHELPER_SUCCESS; - child_pid = tor_spawn_background(filename, &fd_out, &fd_err, argv); + child_pid = tor_spawn_background(filename, &fd_out, &fd_err, argv, NULL); if (child_pid < 0) { log_warn(LD_GENERAL, "Failed to start port forwarding helper %s", filename); diff --git a/src/common/util.h b/src/common/util.h index 2974ab7..1b81fa3 100644 --- a/src/common/util.h +++ b/src/common/util.h @@ -279,6 +279,16 @@ char *rate_limit_log(ratelim_t *lim, time_t now); ssize_t write_all(tor_socket_t fd, const char *buf, size_t count,int isSocket); ssize_t read_all(tor_socket_t fd, char *buf, size_t count, int isSocket); +/** Status of an I/O stream. */ +enum stream_status { + ST_OKAY, + ST_EAGAIN, + ST_TERM, + ST_CLOSED +}; + +enum stream_status get_string_from_pipe(FILE *stream, char *buf, size_t count); + /** Return values from file_status(); see that function's documentation * for details. */ typedef enum { FN_ERROR, FN_NOENT, FN_FILE, FN_DIR } file_status_t; @@ -340,14 +350,16 @@ void write_pidfile(char *filename); void tor_check_port_forwarding(const char *filename, int dir_port, int or_port, time_t now); +int tor_spawn_background(const char *const filename, int *stdout_read, + int *stderr_read, const char **argv, + const char **envp); + #ifdef MS_WINDOWS HANDLE load_windows_system_library(const TCHAR *library_name); #endif #ifdef UTIL_PRIVATE /* Prototypes for private functions only used by util.c (and unit tests) */ -int tor_spawn_background(const char *const filename, int *stdout_read, - int *stderr_read, const char **argv); void format_helper_exit_status(unsigned char child_state, int saved_errno, char *hex_errno); diff --git a/src/test/test_util.c b/src/test/test_util.c index c4769e6..c778faa 100644 --- a/src/test/test_util.c +++ b/src/test/test_util.c @@ -1389,7 +1389,8 @@ run_util_spawn_background(const char *argv[], const char *expected_out, char stdout_buf[100], stderr_buf[100]; /* Start the program */ - retval = tor_spawn_background(argv[0], &stdout_pipe, &stderr_pipe, argv); + retval = tor_spawn_background(argv[0], &stdout_pipe, &stderr_pipe, + argv, NULL); tt_int_op(retval, >, 0); tt_int_op(stdout_pipe, >, 0); tt_int_op(stderr_pipe, >, 0);

1 0

[tor/master] Add support for managed {Client, Server}TransportPlugin parsing.
by nickm＠torproject.org 07 Oct '11

07 Oct '11

commit 73a1e98cb971f7d1105f2b6b2399ae2eeec36a96 Author: George Kadianakis <desnacked(a)gmail.com> Date: Wed Jul 13 18:58:11 2011 +0200 Add support for managed {Client,Server}TransportPlugin parsing. --- src/or/config.c | 219 ++++++++++++++++++++++++++++++++++++++++++++++++------- src/or/or.h | 3 + 2 files changed, 194 insertions(+), 28 deletions(-) diff --git a/src/or/config.c b/src/or/config.c index 0082ff9..111b28b 100644 --- a/src/or/config.c +++ b/src/or/config.c @@ -33,7 +33,9 @@ #include "rendservice.h" #include "rephist.h" #include "router.h" +#include "util.h" #include "routerlist.h" +#include "pluggable_transports.h" #ifdef MS_WINDOWS #include <shlobj.h> #endif @@ -298,6 +300,7 @@ static config_var_t _option_vars[] = { V(HTTPProxyAuthenticator, STRING, NULL), V(HTTPSProxy, STRING, NULL), V(HTTPSProxyAuthenticator, STRING, NULL), + VAR("ServerTransportPlugin", LINELIST, ServerTransportPlugin, NULL), V(Socks4Proxy, STRING, NULL), V(Socks5Proxy, STRING, NULL), V(Socks5ProxyUsername, STRING, NULL), @@ -572,6 +575,8 @@ static void config_register_addressmaps(or_options_t *options); static int parse_bridge_line(const char *line, int validate_only); static int parse_client_transport_line(const char *line, int validate_only); + +static int parse_server_transport_line(const char *line, int validate_only); static int parse_dir_server_line(const char *line, dirinfo_type_t required_type, int validate_only); @@ -1219,6 +1224,18 @@ options_act(or_options_t *old_options) } } + clear_transport_list(); + if (options->ServerTransportPlugin) { + for (cl = options->ServerTransportPlugin; cl; cl = cl->next) { + if (parse_server_transport_line(cl->value, 0)<0) { + log_warn(LD_BUG, + "Previously validated ServerTransportPlugin line " + "could not be added!"); + return -1; + } + } + } + if (options->Bridges) { mark_bridge_list(); for (cl = options->Bridges; cl; cl = cl->next) { @@ -3686,14 +3703,19 @@ options_validate(or_options_t *old_options, or_options_t *options, if (options->UseBridges && !options->TunnelDirConns) REJECT("TunnelDirConns set to 0 only works with UseBridges set to 0"); + for (cl = options->Bridges; cl; cl = cl->next) { + if (parse_bridge_line(cl->value, 1)<0) + REJECT("Bridge line did not parse. See logs for details."); + } + for (cl = options->ClientTransportPlugin; cl; cl = cl->next) { if (parse_client_transport_line(cl->value, 1)<0) REJECT("Transport line did not parse. See logs for details."); } - for (cl = options->Bridges; cl; cl = cl->next) { - if (parse_bridge_line(cl->value, 1)<0) - REJECT("Bridge line did not parse. See logs for details."); + for (cl = options->ServerTransportPlugin; cl; cl = cl->next) { + if (parse_server_transport_line(cl->value, 1)<0) + REJECT("Server transport line did not parse. See logs for details."); } if (options->ConstrainedSockets) { @@ -4652,28 +4674,35 @@ parse_bridge_line(const char *line, int validate_only) SMARTLIST_FOREACH(items, char*, s, tor_free(s)); smartlist_free(items); tor_free(addrport); - tor_free(fingerprint); tor_free(transport_name); + tor_free(fingerprint); return r; } /** Read the contents of a ClientTransportPlugin line from * line. Return 0 if the line is well-formed, and -1 if it - * isn't. If validate_only is 0, and the line is well-formed, - * then add the transport described in the line to our internal - * transport list. -*/ + * isn't. + * + * If validate_only is 0, and the line is well-formed: + * - If it's an external proxy line, add the transport described in the line to + * our internal transport list. + * - If it's a managed proxy line, launch the managed proxy. */ static int parse_client_transport_line(const char *line, int validate_only) { smartlist_t *items = NULL; int r; - char *socks_ver_str=NULL; + char *field2=NULL; + char *name=NULL; char *addrport=NULL; - int socks_ver; tor_addr_t addr; uint16_t port = 0; + int socks_ver=PROXY_NONE; + + /* managed proxy options */ + int is_managed=0; + char **proxy_argv=NULL; items = smartlist_create(); smartlist_split_string(items, line, NULL, @@ -4685,39 +4714,171 @@ parse_client_transport_line(const char *line, int validate_only) } name = smartlist_get(items, 0); + smartlist_del_keeporder(items, 0); - socks_ver_str = smartlist_get(items, 1); + /* field2 is either a SOCKS version or "exec" */ + field2 = smartlist_get(items, 0); + smartlist_del_keeporder(items, 0); - if (!strcmp(socks_ver_str,"socks4")) + if (!strcmp(field2,"socks4")) { socks_ver = PROXY_SOCKS4; - else if (!strcmp(socks_ver_str,"socks5")) + } else if (!strcmp(field2,"socks5")) { socks_ver = PROXY_SOCKS5; - else { - log_warn(LD_CONFIG, "Strange ClientTransportPlugin proxy type '%s'.", - socks_ver_str); + } else if (!strcmp(field2,"exec")) { + is_managed=1; + } else { + log_warn(LD_CONFIG, "Strange ClientTransportPlugin field '%s'.", + field2); goto err; } - addrport = smartlist_get(items, 2); + if (!is_managed) { + addrport = smartlist_get(items, 0); + smartlist_del_keeporder(items, 0); - if (tor_addr_port_parse(addrport, &addr, &port)<0) { - log_warn(LD_CONFIG, "Error parsing transport " - "address '%s'", addrport); - goto err; + if (tor_addr_port_parse(addrport, &addr, &port)<0) { + log_warn(LD_CONFIG, "Error parsing transport " + "address '%s'", addrport); + goto err; + } + if (!port) { + log_warn(LD_CONFIG, + "Transport address '%s' has no port.", addrport); + goto err; + } } - if (!port) { - log_warn(LD_CONFIG, - "Transport address '%s' has no port.", addrport); + if (!validate_only) { + if (is_managed) { /* if it's managed, and we are planning on + launching the proxy, use the rest of the line + as the argv. */ + char **tmp; + char *tmp_arg; + proxy_argv = tor_malloc_zero(sizeof(char*)*(smartlist_len(items)+1)); + tmp = proxy_argv; + while (smartlist_len(items)) { + tmp_arg = smartlist_get(items, 0); + smartlist_del_keeporder(items, 0); + *tmp++ = tor_strdup(tmp_arg); + tor_free(tmp_arg); + } + *tmp = NULL; /*terminated with NUL pointer, just like execve() likes it*/ + + if (pt_managed_launch_client_proxy(name, proxy_argv) < 0) { + log_warn(LD_CONFIG, "Error while launching managed proxy at '%s'", + proxy_argv[0]); + goto err; + } + } else { /* external */ + if (transport_add_from_config(&addr, port, name, + socks_ver) < 0) { + goto err; + } + log_debug(LD_DIR, "Transport %s found at %s:%d", name, + fmt_addr(&addr), (int)port); + } + } + + r = 0; + goto done; + + err: + r = -1; + + done: + SMARTLIST_FOREACH(items, char*, s, tor_free(s)); + smartlist_free(items); + tor_free(name); + tor_free(field2); + tor_free(addrport); + return r; +} + +/** Read the contents of a ServerTransportPlugin line from + * line. Return 0 if the line is well-formed, and -1 if it + * isn't. + * If validate_only is 0, the line is well-formed, and it's a + * managed proxy line, launch the managed proxy. */ +static int +parse_server_transport_line(const char *line, int validate_only) +{ + smartlist_t *items = NULL; + int r; + char *name=NULL; + char *field2=NULL; + char *addrport=NULL; + tor_addr_t addr; + uint16_t port = 0; + + /* managed proxy options */ + int is_managed=0; + char **proxy_argv=NULL; + + items = smartlist_create(); + smartlist_split_string(items, line, NULL, + SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, -1); + + if (smartlist_len(items) < 3) { + log_warn(LD_CONFIG, "Too few arguments on ServerTransportPlugin line."); goto err; } - if (!validate_only) { - log_debug(LD_DIR, "Transport %s found at %s:%d", name, - fmt_addr(&addr), (int)port); + name = smartlist_get(items, 0); + smartlist_del_keeporder(items, 0); + + /* field2 is either <addr:port> or "exec" */ + field2 = smartlist_get(items, 0); + smartlist_del_keeporder(items, 0); - if (transport_add_from_config(&addr, port, name, socks_ver) < 0) + if (!(strstr(field2, ".") || strstr(field2, ":"))) { /* managed proxy */ + if (strcmp(field2, "exec")) { + log_warn(LD_CONFIG, "Unrecognizable field '%s' in " + "ServerTransportPlugin line", field2); + goto err; + } + is_managed=1; + } + + if (!is_managed) { + addrport = field2; + + if (tor_addr_port_parse(addrport, &addr, &port)<0) { + log_warn(LD_CONFIG, "Error parsing transport " + "address '%s'", addrport); + goto err; + } + if (!port) { + log_warn(LD_CONFIG, + "Transport address '%s' has no port.", addrport); goto err; + } + } + + if (!validate_only) { + if (is_managed) { /* if it's managed, and we are planning on + launching the proxy, use the rest of the line + as the argv. */ + char **tmp; + char *tmp_arg; + proxy_argv = tor_malloc_zero(sizeof(char*)*(smartlist_len(items)+1)); + tmp = proxy_argv; + while (smartlist_len(items)) { + tmp_arg = smartlist_get(items, 0); + smartlist_del_keeporder(items, 0); + *tmp++ = tor_strdup(tmp_arg); + tor_free(tmp_arg); + } + *tmp = NULL; /*terminated with NUL pointer, just like execve() likes it*/ + + if (pt_managed_launch_server_proxy(name, proxy_argv) < 0) { + log_warn(LD_CONFIG, "Error while launching managed proxy at '%s'", + proxy_argv[0]); + goto err; + } + } else { + log_warn(LD_DIR, "Transport %s at %s:%d", name, + fmt_addr(&addr), (int)port); + } } r = 0; @@ -4729,6 +4890,8 @@ parse_client_transport_line(const char *line, int validate_only) done: SMARTLIST_FOREACH(items, char*, s, tor_free(s)); smartlist_free(items); + tor_free(name); + tor_free(field2); return r; } diff --git a/src/or/or.h b/src/or/or.h index d1817d4..8bcfc82 100644 --- a/src/or/or.h +++ b/src/or/or.h @@ -2679,6 +2679,9 @@ typedef struct { config_line_t *ClientTransportPlugin; /**< List of client transport plugins. */ + config_line_t *ServerTransportPlugin; /**< List of client + transport plugins. */ + int BridgeRelay; /**< Boolean: are we acting as a bridge relay? We make * this explicit so we can change how we behave in the * future. */

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