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synced 2024-11-11 05:33:47 +01:00
We can now match our transports with our bridges.
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20c31c80fb
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@ -4511,6 +4511,15 @@ typedef struct {
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/** Expected identity digest, or all zero bytes if we don't know what the
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* digest should be. */
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char identity[DIGEST_LEN];
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/** Name of pluggable transport protocol taken from its config line.
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Free'd when we match the bridge with a transport at
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match_bridges_with_transports(). */
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char *transport_name_config;
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/** Pluggable transport proxy this bridge uses. */
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transport_info_t *transport;
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/** When should we next try to fetch a descriptor for this bridge? */
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download_status_t fetch_status;
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} bridge_info_t;
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@ -4557,6 +4566,109 @@ clear_bridge_list(void)
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smartlist_clear(bridge_list);
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}
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/** A list of pluggable transports found in torrc. */
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static smartlist_t *transport_list = NULL;
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/** Initialize the pluggable transports list to empty, creating it if
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needed. */
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void
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clear_transport_list(void)
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{
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if (!transport_list)
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transport_list = smartlist_create();
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SMARTLIST_FOREACH(transport_list, transport_info_t *, t, transport_free(t));
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smartlist_clear(transport_list);
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}
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/**
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Free the transport_info_t <b>transport</b>.
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*/
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static void
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transport_free(transport_info_t *transport)
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{
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tor_free(transport->name);
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tor_free(transport);
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}
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/** Remember a new pluggable transport proxy at <b>addr</b>:<b>port</b>.
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<b>name</b> is set to the name of the protocol this proxy uses.
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<b>socks_ver</b> is set to the SOCKS version of the proxy.
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*/
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void
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transport_add_from_config(const tor_addr_t *addr, uint16_t port,
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const char *name, int socks_ver)
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{
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transport_info_t *t = tor_malloc_zero(sizeof(transport_info_t));
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tor_addr_copy(&t->addr, addr);
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t->port = port;
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/** check strdup return */
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t->name = strdup(name);
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t->socks_version = socks_ver;
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if (!transport_list)
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transport_list = smartlist_create();
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smartlist_add(transport_list, t);
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}
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/**
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Attempts to map every transport found on torrc to it's
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corresponding bridge.
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Returns 1 on a succesfull bijective map, otherwise it returns -1.
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*/
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int
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match_bridges_with_transports(void)
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{
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/* Used to check if a transport was finally found for a bridge */
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int found_match=0;
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/* Number of matches. */
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int n_matches=0;
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/* Number of transports. */
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int n_transports=0;
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tor_assert(transport_list);
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tor_assert(bridge_list);
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/* Iterate bridges */
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SMARTLIST_FOREACH_BEGIN(bridge_list, bridge_info_t *, b)
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{
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/* Skip bridges without transports. */
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if (!b->transport_name_config)
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continue;
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found_match=0;
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/* Iterate transports */
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SMARTLIST_FOREACH_BEGIN(transport_list, transport_info_t *, t)
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{
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/* If the transport name of the transport is the same as the
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transport name of the bridge, we have a match. */
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if (!strcmp(b->transport_name_config, t->name)) {
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found_match=1;
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n_matches++;
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b->transport = t;
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tor_free(b->transport_name_config);
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log_warn(LD_CONFIG, "Matched transport '%s'", t->name);
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continue;
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}
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} SMARTLIST_FOREACH_END(t);
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if (!found_match) {
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log_warn(LD_CONFIG, "Couldn't find transport "
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"match for %s!\n", b->transport_name_config);
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return -1;
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}
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} SMARTLIST_FOREACH_END(b);
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/* count number of transports to see if there were transports
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that didn't get matched to a bridge. */
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SMARTLIST_FOREACH(transport_list, transport_info_t *, t, n_transports++);
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if (n_transports != n_matches) {
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log_warn(LD_CONFIG, "You have %d transports and we only "
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"managed to match %d of them!\n", n_transports, n_matches);
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return -1;
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}
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return 1;
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}
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/** Return a bridge pointer if <b>ri</b> is one of our known bridges
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* (either by comparing keys if possible, else by comparing addr/port).
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* Else return NULL. */
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@ -4638,7 +4750,7 @@ learned_router_identity(const tor_addr_t *addr, uint16_t port,
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* bridge in our list, unmark it, and don't actually add anything new. */
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void
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bridge_add_from_config(const tor_addr_t *addr, uint16_t port,
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const char *digest)
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const char *digest, const char *transport_name)
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{
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bridge_info_t *b;
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@ -4652,6 +4764,8 @@ bridge_add_from_config(const tor_addr_t *addr, uint16_t port,
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b->port = port;
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if (digest)
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memcpy(b->identity, digest, DIGEST_LEN);
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if (transport_name)
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b->transport_name_config = strdup(transport_name);
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b->fetch_status.schedule = DL_SCHED_BRIDGE;
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if (!bridge_list)
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bridge_list = smartlist_create();
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@ -4994,6 +5108,7 @@ entry_guards_free_all(void)
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entry_guards = NULL;
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}
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clear_bridge_list();
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clear_transport_list();
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smartlist_free(bridge_list);
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bridge_list = NULL;
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}
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@ -12,6 +12,22 @@
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#ifndef _TOR_CIRCUITBUILD_H
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#define _TOR_CIRCUITBUILD_H
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/**
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Represents a pluggable transport proxy used by a bridge. */
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typedef struct {
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/* SOCKS version */
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int socks_version;
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/* Name of pluggable transport protocol */
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char *name;
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/* Address of proxy */
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tor_addr_t addr;
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/* Port of proxy */
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uint16_t port;
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} transport_info_t;
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char *circuit_list_path(origin_circuit_t *circ, int verbose);
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char *circuit_list_path_for_controller(origin_circuit_t *circ);
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void circuit_log_path(int severity, unsigned int domain,
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@ -70,7 +86,8 @@ int node_is_a_configured_bridge(const node_t *node);
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void learned_router_identity(const tor_addr_t *addr, uint16_t port,
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const char *digest);
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void bridge_add_from_config(const tor_addr_t *addr, uint16_t port,
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const char *digest);
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const char *digest,
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const char *transport_name);
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void retry_bridge_descriptor_fetch_directly(const char *digest);
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void fetch_bridge_descriptors(or_options_t *options, time_t now);
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void learned_bridge_descriptor(routerinfo_t *ri, int from_cache);
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@ -126,5 +143,10 @@ void circuit_build_times_network_circ_success(circuit_build_times_t *cbt);
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int circuit_build_times_get_bw_scale(networkstatus_t *ns);
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void clear_transport_list(void);
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int match_bridges_with_transports(void);
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void transport_add_from_config(const tor_addr_t *addr, uint16_t port,
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const char *name, int socks_ver);
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#endif
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@ -1208,6 +1208,7 @@ options_act(or_options_t *old_options)
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return -1;
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if (options->ClientTransportPlugin) {
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clear_transport_list();
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for (cl = options->ClientTransportPlugin; cl; cl = cl->next) {
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if (parse_transport_line(cl->value, 0)<0) {
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log_warn(LD_BUG,
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@ -1230,6 +1231,13 @@ options_act(or_options_t *old_options)
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sweep_bridge_list();
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}
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/** Okay, we have Bridges and we have ClientTransportPlugins. Let's
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match them together. */
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if (options->Bridges && options->ClientTransportPlugin) {
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if (match_bridges_with_transports() < 0)
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return -1;
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}
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if (running_tor && rend_config_services(options, 0)<0) {
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log_warn(LD_BUG,
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"Previously validated hidden services line could not be added!");
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@ -4629,7 +4637,7 @@ parse_bridge_line(const char *line, int validate_only)
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fmt_addr(&addr), (int)port, transport_name,
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fingerprint ? fingerprint : "no key listed");
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bridge_add_from_config(&addr, port,
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fingerprint ? digest : NULL/*, transport_name*/);
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fingerprint ? digest : NULL, transport_name);
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}
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r = 0;
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@ -4702,8 +4710,8 @@ parse_transport_line(const char *line, int validate_only)
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if (!validate_only) {
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log_warn(LD_DIR, "Transport %s at %s:%d", name,
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fmt_addr(&addr), (int)port);
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/* transport_add_from_config(&addr, port,
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fingerprint ? digest : NULL, transport); */
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transport_add_from_config(&addr, port, name,
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socks_ver);
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}
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r = 0;
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