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- /* Copyright (c) 2001 Matej Pfajfar.
- * Copyright (c) 2001-2004, Roger Dingledine.
- * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson. */
- /* See LICENSE for licensing information */
- /* $Id$ */
- const char circuituse_c_id[] =
- "$Id$";
- /**
- * \file circuituse.c
- * \brief Launch the right sort of circuits and attach streams to them.
- **/
- #include "or.h"
- /** Longest time to wait for a circuit before closing an AP connection */
- #define CONN_AP_MAX_ATTACH_DELAY 59
- /********* START VARIABLES **********/
- extern circuit_t *global_circuitlist; /* from circuitlist.c */
- /********* END VARIABLES ************/
- static void circuit_expire_old_circuits(void);
- static void circuit_increment_failure_count(void);
- /* Return 1 if <b>circ</b> could be returned by circuit_get_best().
- * Else return 0.
- */
- static int
- circuit_is_acceptable(circuit_t *circ, connection_t *conn,
- int must_be_open, uint8_t purpose,
- int need_uptime, int need_internal,
- time_t now)
- {
- routerinfo_t *exitrouter;
- tor_assert(circ);
- tor_assert(conn);
- tor_assert(conn->socks_request);
- if (!CIRCUIT_IS_ORIGIN(circ))
- return 0; /* this circ doesn't start at us */
- if (must_be_open && (circ->state != CIRCUIT_STATE_OPEN || !circ->n_conn))
- return 0; /* ignore non-open circs */
- if (circ->marked_for_close)
- return 0;
- /* if this circ isn't our purpose, skip. */
- if (purpose == CIRCUIT_PURPOSE_C_REND_JOINED && !must_be_open) {
- if (circ->purpose != CIRCUIT_PURPOSE_C_ESTABLISH_REND &&
- circ->purpose != CIRCUIT_PURPOSE_C_REND_READY &&
- circ->purpose != CIRCUIT_PURPOSE_C_REND_READY_INTRO_ACKED &&
- circ->purpose != CIRCUIT_PURPOSE_C_REND_JOINED)
- return 0;
- } else if (purpose == CIRCUIT_PURPOSE_C_INTRODUCE_ACK_WAIT &&
- !must_be_open) {
- if (circ->purpose != CIRCUIT_PURPOSE_C_INTRODUCING &&
- circ->purpose != CIRCUIT_PURPOSE_C_INTRODUCE_ACK_WAIT)
- return 0;
- } else {
- if (purpose != circ->purpose)
- return 0;
- }
- if (purpose == CIRCUIT_PURPOSE_C_GENERAL)
- if (circ->timestamp_dirty &&
- circ->timestamp_dirty+get_options()->MaxCircuitDirtiness <= now)
- return 0;
- /* decide if this circ is suitable for this conn */
- /* for rend circs, circ->cpath->prev is not the last router in the
- * circuit, it's the magical extra bob hop. so just check the nickname
- * of the one we meant to finish at.
- */
- exitrouter = build_state_get_exit_router(circ->build_state);
- if (need_uptime && !circ->build_state->need_uptime)
- return 0;
- if (need_internal != circ->build_state->is_internal)
- return 0;
- if (purpose == CIRCUIT_PURPOSE_C_GENERAL) {
- if (!exitrouter) {
- debug(LD_CIRC,"Not considering circuit with unknown router.");
- return 0; /* this circuit is screwed and doesn't know it yet,
- * or is a rendezvous circuit. */
- }
- if (!connection_ap_can_use_exit(conn, exitrouter)) {
- /* can't exit from this router */
- return 0;
- }
- } else { /* not general */
- if (rend_cmp_service_ids(conn->rend_query, circ->rend_query)) {
- /* this circ is not for this conn */
- return 0;
- }
- }
- return 1;
- }
- /* Return 1 if circuit <b>a</b> is better than circuit <b>b</b> for
- * <b>purpose</b>, and return 0 otherwise. Used by circuit_get_best.
- */
- static int
- circuit_is_better(circuit_t *a, circuit_t *b, uint8_t purpose)
- {
- switch (purpose) {
- case CIRCUIT_PURPOSE_C_GENERAL:
- /* if it's used but less dirty it's best;
- * else if it's more recently created it's best
- */
- if (b->timestamp_dirty) {
- if (a->timestamp_dirty &&
- a->timestamp_dirty > b->timestamp_dirty)
- return 1;
- } else {
- if (a->timestamp_dirty ||
- b->build_state->is_internal ||
- a->timestamp_created > b->timestamp_created)
- return 1;
- }
- break;
- case CIRCUIT_PURPOSE_C_INTRODUCE_ACK_WAIT:
- /* the closer it is to ack_wait the better it is */
- if (a->purpose > b->purpose)
- return 1;
- break;
- case CIRCUIT_PURPOSE_C_REND_JOINED:
- /* the closer it is to rend_joined the better it is */
- if (a->purpose > b->purpose)
- return 1;
- break;
- }
- return 0;
- }
- /** Find the best circ that conn can use, preferably one which is
- * dirty. Circ must not be too old.
- *
- * Conn must be defined.
- *
- * If must_be_open, ignore circs not in CIRCUIT_STATE_OPEN.
- *
- * circ_purpose specifies what sort of circuit we must have.
- * It can be C_GENERAL, C_INTRODUCE_ACK_WAIT, or C_REND_JOINED.
- *
- * If it's REND_JOINED and must_be_open==0, then return the closest
- * rendezvous-purposed circuit that you can find.
- *
- * If it's INTRODUCE_ACK_WAIT and must_be_open==0, then return the
- * closest introduce-purposed circuit that you can find.
- */
- static circuit_t *
- circuit_get_best(connection_t *conn, int must_be_open, uint8_t purpose,
- int need_uptime, int need_internal)
- {
- circuit_t *circ, *best=NULL;
- time_t now = time(NULL);
- tor_assert(conn);
- tor_assert(purpose == CIRCUIT_PURPOSE_C_GENERAL ||
- purpose == CIRCUIT_PURPOSE_C_INTRODUCE_ACK_WAIT ||
- purpose == CIRCUIT_PURPOSE_C_REND_JOINED);
- for (circ=global_circuitlist;circ;circ = circ->next) {
- if (!circuit_is_acceptable(circ,conn,must_be_open,purpose,
- need_uptime,need_internal,now))
- continue;
- /* now this is an acceptable circ to hand back. but that doesn't
- * mean it's the *best* circ to hand back. try to decide.
- */
- if (!best || circuit_is_better(circ,best,purpose))
- best = circ;
- }
- return best;
- }
- /** If we find a circuit that isn't open yet and was born this many
- * seconds ago, then assume something went wrong, and cull it.
- */
- #define MIN_SECONDS_BEFORE_EXPIRING_CIRC 30
- /** Close all circuits that start at us, aren't open, and were born
- * at least MIN_SECONDS_BEFORE_EXPIRING_CIRC seconds ago.
- */
- void
- circuit_expire_building(time_t now)
- {
- circuit_t *victim, *circ = global_circuitlist;
- time_t cutoff = now - MIN_SECONDS_BEFORE_EXPIRING_CIRC;
- while (circ) {
- victim = circ;
- circ = circ->next;
- if (!CIRCUIT_IS_ORIGIN(victim) || /* didn't originate here */
- victim->timestamp_created > cutoff || /* Not old enough to expire */
- victim->marked_for_close) /* don't mess with marked circs */
- continue;
- #if 0
- /* some debug logs, to help track bugs */
- if (victim->purpose >= CIRCUIT_PURPOSE_C_INTRODUCING &&
- victim->purpose <= CIRCUIT_PURPOSE_C_REND_READY_INTRO_ACKED) {
- if (!victim->timestamp_dirty)
- log_fn(LOG_DEBUG,"Considering %sopen purp %d to %s (circid %d)."
- "(clean).",
- victim->state == CIRCUIT_STATE_OPEN ? "" : "non",
- victim->purpose, victim->build_state->chosen_exit_name,
- victim->n_circ_id);
- else
- log_fn(LOG_DEBUG,"Considering %sopen purp %d to %s (circid %d). "
- "%d secs since dirty.",
- victim->state == CIRCUIT_STATE_OPEN ? "" : "non",
- victim->purpose, victim->build_state->chosen_exit_name,
- victim->n_circ_id,
- (int)(now - victim->timestamp_dirty));
- }
- #endif
- /* if circ is !open, or if it's open but purpose is a non-finished
- * intro or rend, then mark it for close */
- if (victim->state == CIRCUIT_STATE_OPEN) {
- switch (victim->purpose) {
- default: /* most open circuits can be left alone. */
- continue; /* yes, continue inside a switch refers to the nearest
- * enclosing loop. C is smart. */
- case CIRCUIT_PURPOSE_C_ESTABLISH_REND:
- case CIRCUIT_PURPOSE_C_INTRODUCING:
- case CIRCUIT_PURPOSE_S_ESTABLISH_INTRO:
- break; /* too old, need to die */
- case CIRCUIT_PURPOSE_C_REND_READY:
- /* it's a rend_ready circ -- has it already picked a query? */
- /* c_rend_ready circs measure age since timestamp_dirty,
- * because that's set when they switch purposes
- */
- if (!victim->rend_query[0] || victim->timestamp_dirty > cutoff)
- continue;
- break;
- case CIRCUIT_PURPOSE_C_REND_READY_INTRO_ACKED:
- case CIRCUIT_PURPOSE_C_INTRODUCE_ACK_WAIT:
- /* rend and intro circs become dirty each time they
- * make an introduction attempt. so timestamp_dirty
- * will reflect the time since the last attempt.
- */
- if (victim->timestamp_dirty > cutoff)
- continue;
- break;
- }
- }
- if (victim->n_conn)
- info(LD_CIRC,"Abandoning circ %s:%d:%d (state %d:%s, purpose %d)",
- victim->n_conn->address, victim->n_port, victim->n_circ_id,
- victim->state, circuit_state_to_string(victim->state),
- victim->purpose);
- else
- info(LD_CIRC,"Abandoning circ %d (state %d:%s, purpose %d)",
- victim->n_circ_id, victim->state,
- circuit_state_to_string(victim->state), victim->purpose);
- circuit_log_path(LOG_INFO,LD_CIRC,victim);
- circuit_mark_for_close(victim, END_CIRC_AT_ORIGIN);
- }
- }
- /** Remove any elements in <b>needed_ports</b> that are handled by an
- * open or in-progress circuit.
- */
- void
- circuit_remove_handled_ports(smartlist_t *needed_ports)
- {
- int i;
- uint16_t *port;
- for (i = 0; i < smartlist_len(needed_ports); ++i) {
- port = smartlist_get(needed_ports, i);
- tor_assert(*port);
- if (circuit_stream_is_being_handled(NULL, *port, 2)) {
- // debug(LD_CIRC,"Port %d is already being handled; removing.", port);
- smartlist_del(needed_ports, i--);
- tor_free(port);
- } else {
- debug(LD_CIRC,"Port %d is not handled.", *port);
- }
- }
- }
- /** Return 1 if at least <b>min</b> general-purpose non-internal circuits
- * will have an acceptable exit node for exit stream <b>conn</b> if it
- * is defined, else for "*:port".
- * Else return 0.
- */
- int
- circuit_stream_is_being_handled(connection_t *conn, uint16_t port, int min)
- {
- circuit_t *circ;
- routerinfo_t *exitrouter;
- int num=0;
- time_t now = time(NULL);
- int need_uptime = smartlist_string_num_isin(get_options()->LongLivedPorts,
- conn ? conn->socks_request->port : port);
- for (circ=global_circuitlist;circ;circ = circ->next) {
- if (CIRCUIT_IS_ORIGIN(circ) &&
- !circ->marked_for_close &&
- circ->purpose == CIRCUIT_PURPOSE_C_GENERAL &&
- !circ->build_state->is_internal &&
- (!circ->timestamp_dirty ||
- circ->timestamp_dirty + get_options()->MaxCircuitDirtiness > now)) {
- exitrouter = build_state_get_exit_router(circ->build_state);
- if (exitrouter &&
- (!need_uptime || circ->build_state->need_uptime)) {
- int ok;
- if (conn) {
- ok = connection_ap_can_use_exit(conn, exitrouter);
- } else {
- addr_policy_result_t r = router_compare_addr_to_addr_policy(
- 0, port, exitrouter->exit_policy);
- ok = r != ADDR_POLICY_REJECTED && r != ADDR_POLICY_PROBABLY_REJECTED;
- }
- if (ok) {
- if (++num >= min)
- return 1;
- }
- }
- }
- }
- return 0;
- }
- /** Don't keep more than 10 unused open circuits around. */
- #define MAX_UNUSED_OPEN_CIRCUITS 12
- /** Figure out how many circuits we have open that are clean. Make
- * sure it's enough for all the upcoming behaviors we predict we'll have.
- * But if we have too many, close the not-so-useful ones.
- */
- static void
- circuit_predict_and_launch_new(void)
- {
- circuit_t *circ;
- int num=0, num_internal=0, num_uptime_internal=0;
- int hidserv_needs_uptime=0, hidserv_needs_capacity=1;
- int port_needs_uptime=0, port_needs_capacity=1;
- time_t now = time(NULL);
- /* First, count how many of each type of circuit we have already. */
- for (circ=global_circuitlist;circ;circ = circ->next) {
- if (!CIRCUIT_IS_ORIGIN(circ))
- continue;
- if (circ->marked_for_close)
- continue; /* don't mess with marked circs */
- if (circ->timestamp_dirty)
- continue; /* only count clean circs */
- if (circ->purpose != CIRCUIT_PURPOSE_C_GENERAL)
- continue; /* only pay attention to general-purpose circs */
- num++;
- if (circ->build_state->is_internal)
- num_internal++;
- if (circ->build_state->need_uptime && circ->build_state->is_internal)
- num_uptime_internal++;
- }
- /* If that's enough, then stop now. */
- if (num >= MAX_UNUSED_OPEN_CIRCUITS)
- return; /* we already have many, making more probably will hurt */
- /* Second, see if we need any more exit circuits. */
- /* check if we know of a port that's been requested recently
- * and no circuit is currently available that can handle it. */
- if (!circuit_all_predicted_ports_handled(now, &port_needs_uptime,
- &port_needs_capacity)) {
- info(LD_CIRC,"Have %d clean circs (%d internal), need another exit circ.",
- num, num_internal);
- circuit_launch_by_router(CIRCUIT_PURPOSE_C_GENERAL, NULL,
- port_needs_uptime, port_needs_capacity, 0);
- return;
- }
- /* Third, see if we need any more hidden service (server) circuits. */
- if (num_rend_services() && num_uptime_internal < 3) {
- info(LD_CIRC,"Have %d clean circs (%d internal), need another internal "
- "circ for my hidden service.",
- num, num_internal);
- circuit_launch_by_router(CIRCUIT_PURPOSE_C_GENERAL, NULL,
- 1, 1, 1);
- return;
- }
- /* Fourth, see if we need any more hidden service (client) circuits. */
- if (rep_hist_get_predicted_internal(now, &hidserv_needs_uptime,
- &hidserv_needs_capacity) &&
- ((num_uptime_internal<2 && hidserv_needs_uptime) ||
- num_internal<2)) {
- info(LD_CIRC,"Have %d clean circs (%d uptime-internal, %d internal), need"
- " another hidserv circ.", num, num_uptime_internal, num_internal);
- circuit_launch_by_router(CIRCUIT_PURPOSE_C_GENERAL, NULL,
- hidserv_needs_uptime, hidserv_needs_capacity, 1);
- return;
- }
- }
- /** Build a new test circuit every 5 minutes */
- #define TESTING_CIRCUIT_INTERVAL 300
- /** This function is called once a second. Its job is to make sure
- * all services we offer have enough circuits available. Some
- * services just want enough circuits for current tasks, whereas
- * others want a minimum set of idle circuits hanging around.
- */
- void
- circuit_build_needed_circs(time_t now)
- {
- static long time_to_new_circuit = 0;
- /* launch a new circ for any pending streams that need one */
- connection_ap_attach_pending();
- /* make sure any hidden services have enough intro points */
- if (router_have_minimum_dir_info())
- rend_services_introduce();
- if (time_to_new_circuit < now) {
- circuit_reset_failure_count(1);
- time_to_new_circuit = now + get_options()->NewCircuitPeriod;
- if (proxy_mode(get_options()))
- addressmap_clean(now);
- circuit_expire_old_circuits();
- #if 0 /* disable for now, until predict-and-launch-new can cull leftovers */
- circ = circuit_get_youngest_clean_open(CIRCUIT_PURPOSE_C_GENERAL);
- if (get_options()->RunTesting &&
- circ &&
- circ->timestamp_created + TESTING_CIRCUIT_INTERVAL < now) {
- log_fn(LOG_INFO,"Creating a new testing circuit.");
- circuit_launch_by_router(CIRCUIT_PURPOSE_C_GENERAL, NULL, 0, 0, 0);
- }
- #endif
- }
- circuit_predict_and_launch_new();
- }
- /** If the stream <b>conn</b> is a member of any of the linked
- * lists of <b>circ</b>, then remove it from the list.
- */
- void
- circuit_detach_stream(circuit_t *circ, connection_t *conn)
- {
- connection_t *prevconn;
- tor_assert(circ);
- tor_assert(conn);
- conn->cpath_layer = NULL; /* make sure we don't keep a stale pointer */
- conn->on_circuit = NULL;
- if (conn == circ->p_streams) {
- circ->p_streams = conn->next_stream;
- return;
- }
- if (conn == circ->n_streams) {
- circ->n_streams = conn->next_stream;
- return;
- }
- if (conn == circ->resolving_streams) {
- circ->resolving_streams = conn->next_stream;
- return;
- }
- for (prevconn = circ->p_streams;
- prevconn && prevconn->next_stream && prevconn->next_stream != conn;
- prevconn = prevconn->next_stream)
- ;
- if (prevconn && prevconn->next_stream) {
- prevconn->next_stream = conn->next_stream;
- return;
- }
- for (prevconn = circ->n_streams;
- prevconn && prevconn->next_stream && prevconn->next_stream != conn;
- prevconn = prevconn->next_stream)
- ;
- if (prevconn && prevconn->next_stream) {
- prevconn->next_stream = conn->next_stream;
- return;
- }
- for (prevconn = circ->resolving_streams;
- prevconn && prevconn->next_stream && prevconn->next_stream != conn;
- prevconn = prevconn->next_stream)
- ;
- if (prevconn && prevconn->next_stream) {
- prevconn->next_stream = conn->next_stream;
- return;
- }
- err(LD_BUG,"edge conn not in circuit's list?");
- tor_assert(0); /* should never get here */
- }
- /** Notify the global circuit list that <b>conn</b> is about to be
- * removed and then freed.
- *
- * If it's an OR conn, then mark-for-close all the circuits that use
- * that conn.
- *
- * If it's an edge conn, then detach it from its circ, so we don't
- * try to reference it later.
- */
- void
- circuit_about_to_close_connection(connection_t *conn)
- {
- /* currently, we assume it's too late to flush conn's buf here.
- * down the road, maybe we'll consider that eof doesn't mean can't-write
- */
- switch (conn->type) {
- case CONN_TYPE_OR: {
- /* Inform any pending (not attached) circs that they should give up. */
- circuit_n_conn_done(conn, 0);
- /* Now close all the attached circuits on it. */
- circuit_unlink_all_from_or_conn(conn, END_CIRC_REASON_OR_CONN_CLOSED);
- return;
- }
- case CONN_TYPE_AP:
- case CONN_TYPE_EXIT: {
- circuit_t *circ;
- /* It's an edge conn. Need to remove it from the linked list of
- * conn's for this circuit. Confirm that 'end' relay command has
- * been sent. But don't kill the circuit.
- */
- circ = circuit_get_by_edge_conn(conn);
- if (!circ)
- return;
- circuit_detach_stream(circ, conn);
- }
- } /* end switch */
- }
- /** Find each circuit that has been dirty for too long, and has
- * no streams on it: mark it for close.
- */
- static void
- circuit_expire_old_circuits(void)
- {
- circuit_t *circ;
- time_t now = time(NULL);
- for (circ = global_circuitlist; circ; circ = circ->next) {
- if (circ->marked_for_close)
- continue;
- /* If the circuit has been dirty for too long, and there are no streams
- * on it, mark it for close.
- */
- if (circ->timestamp_dirty &&
- circ->timestamp_dirty + get_options()->MaxCircuitDirtiness < now &&
- CIRCUIT_IS_ORIGIN(circ) &&
- !circ->p_streams /* nothing attached */ ) {
- debug(LD_CIRC, "Closing n_circ_id %d (dirty %d secs ago, purp %d)",
- circ->n_circ_id, (int)(now - circ->timestamp_dirty),
- circ->purpose);
- /* (only general and purpose_c circs can get dirty) */
- tor_assert(!circ->n_streams);
- tor_assert(circ->purpose <= CIRCUIT_PURPOSE_C_REND_JOINED);
- circuit_mark_for_close(circ, END_CIRC_AT_ORIGIN);
- } else if (!circ->timestamp_dirty && CIRCUIT_IS_ORIGIN(circ) &&
- circ->state == CIRCUIT_STATE_OPEN &&
- circ->purpose == CIRCUIT_PURPOSE_C_GENERAL) {
- #define CIRCUIT_UNUSED_CIRC_TIMEOUT 3600 /* an hour */
- if (circ->timestamp_created + CIRCUIT_UNUSED_CIRC_TIMEOUT < now) {
- debug(LD_CIRC,"Closing circuit that has been unused for %d seconds.",
- (int)(now - circ->timestamp_created));
- circuit_mark_for_close(circ, END_CIRC_AT_ORIGIN);
- }
- }
- }
- }
- /** A testing circuit has completed. Take whatever stats we want. */
- static void
- circuit_testing_opened(circuit_t *circ)
- {
- /* For now, we only use testing circuits to see if our ORPort is
- reachable. But we remember reachability in onionskin_answer(),
- so there's no need to record anything here. Just close the circ. */
- circuit_mark_for_close(circ, END_CIRC_AT_ORIGIN);
- }
- /** A testing circuit has failed to build. Take whatever stats we want. */
- static void
- circuit_testing_failed(circuit_t *circ, int at_last_hop)
- {
- #if 0
- routerinfo_t *me = router_get_my_routerinfo();
- if (!at_last_hop)
- circuit_launch_by_router(CIRCUIT_PURPOSE_TESTING, me, 0, 1, 1);
- else
- #endif
- info(LD_GENERAL,"Our testing circuit (to see if your ORPort is reachable) "
- "has failed. I'll try again later.");
- }
- /** The circuit <b>circ</b> has just become open. Take the next
- * step: for rendezvous circuits, we pass circ to the appropriate
- * function in rendclient or rendservice. For general circuits, we
- * call connection_ap_attach_pending, which looks for pending streams
- * that could use circ.
- */
- void
- circuit_has_opened(circuit_t *circ)
- {
- control_event_circuit_status(circ, CIRC_EVENT_BUILT);
- switch (circ->purpose) {
- case CIRCUIT_PURPOSE_C_ESTABLISH_REND:
- rend_client_rendcirc_has_opened(circ);
- connection_ap_attach_pending();
- break;
- case CIRCUIT_PURPOSE_C_INTRODUCING:
- rend_client_introcirc_has_opened(circ);
- break;
- case CIRCUIT_PURPOSE_C_GENERAL:
- /* Tell any AP connections that have been waiting for a new
- * circuit that one is ready. */
- connection_ap_attach_pending();
- break;
- case CIRCUIT_PURPOSE_S_ESTABLISH_INTRO:
- /* at Bob, waiting for introductions */
- rend_service_intro_has_opened(circ);
- break;
- case CIRCUIT_PURPOSE_S_CONNECT_REND:
- /* at Bob, connecting to rend point */
- rend_service_rendezvous_has_opened(circ);
- break;
- case CIRCUIT_PURPOSE_TESTING:
- circuit_testing_opened(circ);
- break;
- default:
- err(LD_BUG,"unhandled purpose %d",circ->purpose);
- tor_assert(0);
- }
- }
- /** Called whenever a circuit could not be successfully built.
- */
- void
- circuit_build_failed(circuit_t *circ)
- {
- /* we should examine circ and see if it failed because of
- * the last hop or an earlier hop. then use this info below.
- */
- int failed_at_last_hop = 0;
- /* If the last hop isn't open, and the second-to-last is, we failed
- * at the last hop. */
- if (circ->cpath &&
- circ->cpath->prev->state != CPATH_STATE_OPEN &&
- circ->cpath->prev->prev->state == CPATH_STATE_OPEN) {
- failed_at_last_hop = 1;
- }
- if (circ->cpath &&
- circ->cpath->state != CPATH_STATE_OPEN) {
- /* We failed at the first hop. If there's an OR connection
- to blame, blame it. */
- connection_t *n_conn = NULL;
- if (circ->n_conn) {
- n_conn = circ->n_conn;
- } else if (circ->state == CIRCUIT_STATE_OR_WAIT) {
- /* we have to hunt for it */
- n_conn = connection_or_get_by_identity_digest(circ->n_conn_id_digest);
- }
- if (n_conn) {
- info(LD_OR, "Our circuit failed to get a response from the first hop "
- "(%s:%d). I'm going to try to rotate to a better connection.",
- n_conn->address, n_conn->port);
- n_conn->is_obsolete = 1;
- entry_guard_set_status(n_conn->identity_digest, 0);
- }
- }
- switch (circ->purpose) {
- case CIRCUIT_PURPOSE_C_GENERAL:
- if (circ->state != CIRCUIT_STATE_OPEN) {
- /* If we never built the circuit, note it as a failure. */
- /* Note that we can't just check circ->cpath here, because if
- * circuit-building failed immediately, it won't be set yet. */
- circuit_increment_failure_count();
- }
- break;
- case CIRCUIT_PURPOSE_TESTING:
- circuit_testing_failed(circ, failed_at_last_hop);
- break;
- case CIRCUIT_PURPOSE_S_ESTABLISH_INTRO:
- /* at Bob, waiting for introductions */
- if (circ->state != CIRCUIT_STATE_OPEN) {
- circuit_increment_failure_count();
- }
- /* no need to care here, because bob will rebuild intro
- * points periodically. */
- break;
- case CIRCUIT_PURPOSE_C_INTRODUCING:
- /* at Alice, connecting to intro point */
- /* Don't increment failure count, since Bob may have picked
- * the introduction point maliciously */
- /* Alice will pick a new intro point when this one dies, if
- * the stream in question still cares. No need to act here. */
- break;
- case CIRCUIT_PURPOSE_C_ESTABLISH_REND:
- /* at Alice, waiting for Bob */
- if (circ->state != CIRCUIT_STATE_OPEN) {
- circuit_increment_failure_count();
- }
- /* Alice will pick a new rend point when this one dies, if
- * the stream in question still cares. No need to act here. */
- break;
- case CIRCUIT_PURPOSE_S_CONNECT_REND:
- /* at Bob, connecting to rend point */
- /* Don't increment failure count, since Alice may have picked
- * the rendezvous point maliciously */
- info(LD_REND,
- "Couldn't connect to Alice's chosen rend point %s (%s hop failed).",
- build_state_get_exit_nickname(circ->build_state),
- failed_at_last_hop?"last":"non-last");
- rend_service_relaunch_rendezvous(circ);
- break;
- default:
- /* Other cases are impossible, since this function is only called with
- * unbuilt circuits. */
- tor_assert(0);
- }
- }
- /** Number of consecutive failures so far; should only be touched by
- * circuit_launch_new and circuit_*_failure_count.
- */
- static int n_circuit_failures = 0;
- static int did_circs_fail_last_period = 0;
- /** Don't retry launching a new circuit if we try this many times with no
- * success. */
- #define MAX_CIRCUIT_FAILURES 5
- /** Launch a new circuit; see circuit_launch_by_extend_info() for
- * details on arguments. */
- circuit_t *
- circuit_launch_by_router(uint8_t purpose, routerinfo_t *exit,
- int need_uptime, int need_capacity, int internal)
- {
- circuit_t *circ;
- extend_info_t *info = NULL;
- if (exit)
- info = extend_info_from_router(exit);
- circ = circuit_launch_by_extend_info(
- purpose, info, need_uptime, need_capacity, internal);
- if (info)
- extend_info_free(info);
- return circ;
- }
- /** Launch a new circuit with purpose <b>purpose</b> and exit node <b>info</b>
- * (or NULL to select a random exit node). If <b>need_uptime</b> is true,
- * choose among routers with high uptime. If <b>need_capacity</b> is true,
- * choose among routers with high bandwidth. If <b>internal</b> is true, the
- * last hop need not be an exit node. Return the newly allocated circuit on
- * success, or NULL on failure. */
- circuit_t *
- circuit_launch_by_extend_info(uint8_t purpose, extend_info_t *extend_info,
- int need_uptime, int need_capacity, int internal)
- {
- circuit_t *circ;
- if (!router_have_minimum_dir_info()) {
- debug(LD_CIRC,"Haven't fetched enough directory info yet; canceling "
- "circuit launch.");
- return NULL;
- }
- if ((extend_info || purpose != CIRCUIT_PURPOSE_C_GENERAL) &&
- purpose != CIRCUIT_PURPOSE_TESTING) {
- /* see if there are appropriate circs available to cannibalize. */
- circ = circuit_find_to_cannibalize(CIRCUIT_PURPOSE_C_GENERAL, extend_info,
- need_uptime, need_capacity, internal);
- if (circ) {
- info(LD_CIRC,"Cannibalizing circ '%s' for purpose %d",
- build_state_get_exit_nickname(circ->build_state), purpose);
- circ->purpose = purpose;
- /* reset the birth date of this circ, else expire_building
- * will see it and think it's been trying to build since it
- * began. */
- circ->timestamp_created = time(NULL);
- switch (purpose) {
- case CIRCUIT_PURPOSE_C_ESTABLISH_REND:
- case CIRCUIT_PURPOSE_S_ESTABLISH_INTRO:
- /* it's ready right now */
- break;
- case CIRCUIT_PURPOSE_C_INTRODUCING:
- case CIRCUIT_PURPOSE_S_CONNECT_REND:
- case CIRCUIT_PURPOSE_C_GENERAL:
- /* need to add a new hop */
- tor_assert(extend_info);
- if (circuit_extend_to_new_exit(circ, extend_info) < 0)
- return NULL;
- break;
- default:
- warn(LD_BUG, "Bug: unexpected purpose %d when cannibalizing a circ.",
- purpose);
- tor_fragile_assert();
- return NULL;
- }
- return circ;
- }
- }
- if (did_circs_fail_last_period &&
- n_circuit_failures > MAX_CIRCUIT_FAILURES) {
- /* too many failed circs in a row. don't try. */
- // log_fn(LOG_INFO,"%d failures so far, not trying.",n_circuit_failures);
- return NULL;
- }
- /* try a circ. if it fails, circuit_mark_for_close will increment
- * n_circuit_failures */
- return circuit_establish_circuit(purpose, extend_info,
- need_uptime, need_capacity, internal);
- }
- /** Launch a new circuit; see circuit_launch_by_extend_info() for
- * details on arguments. */
- circuit_t *
- circuit_launch_by_nickname(uint8_t purpose, const char *exit_nickname,
- int need_uptime, int need_capacity, int internal)
- {
- routerinfo_t *router = NULL;
- if (exit_nickname) {
- router = router_get_by_nickname(exit_nickname, 1);
- if (!router) {
- /*XXXXNM domain? */
- warn(LD_GENERAL, "No such OR as '%s'", exit_nickname);
- return NULL;
- }
- }
- return circuit_launch_by_router(purpose, router,
- need_uptime, need_capacity, internal);
- }
- /** Record another failure at opening a general circuit. When we have
- * too many, we'll stop trying for the remainder of this minute.
- */
- static void
- circuit_increment_failure_count(void)
- {
- ++n_circuit_failures;
- debug(LD_CIRC,"n_circuit_failures now %d.",n_circuit_failures);
- }
- /** Reset the failure count for opening general circuits. This means
- * we will try MAX_CIRCUIT_FAILURES times more (if necessary) before
- * stopping again.
- */
- void
- circuit_reset_failure_count(int timeout)
- {
- if (timeout && n_circuit_failures > MAX_CIRCUIT_FAILURES)
- did_circs_fail_last_period = 1;
- else
- did_circs_fail_last_period = 0;
- n_circuit_failures = 0;
- }
- /** Find an open circ that we're happy with: return 1. If there isn't
- * one, and there isn't one on the way, launch one and return 0. If it
- * will never work, return -1.
- *
- * Write the found or in-progress or launched circ into *circp.
- */
- static int
- circuit_get_open_circ_or_launch(connection_t *conn,
- uint8_t desired_circuit_purpose,
- circuit_t **circp)
- {
- circuit_t *circ;
- int is_resolve;
- int need_uptime, need_internal;
- tor_assert(conn);
- tor_assert(circp);
- tor_assert(conn->state == AP_CONN_STATE_CIRCUIT_WAIT);
- is_resolve = conn->socks_request->command == SOCKS_COMMAND_RESOLVE;
- need_uptime = smartlist_string_num_isin(get_options()->LongLivedPorts,
- conn->socks_request->port);
- need_internal = desired_circuit_purpose != CIRCUIT_PURPOSE_C_GENERAL;
- circ = circuit_get_best(conn, 1, desired_circuit_purpose,
- need_uptime, need_internal);
- if (circ) {
- *circp = circ;
- return 1; /* we're happy */
- }
- if (!router_have_minimum_dir_info()) {
- if (!connection_get_by_type(CONN_TYPE_DIR)) {
- notice(LD_APP|LD_DIR,"Application request when we're believed to be "
- "offline. Optimistically trying directory fetches again.");
- router_reset_status_download_failures();
- router_reset_descriptor_download_failures();
- update_networkstatus_downloads(time(NULL));
- /* XXXX011 NM This should be a generic "retry all directory fetches". */
- directory_get_from_dirserver(DIR_PURPOSE_FETCH_DIR, NULL, 1);
- }
- /* the stream will be dealt with when router_have_minimum_dir_info becomes
- * 1, or when all directory attempts fail and directory_all_unreachable()
- * kills it.
- */
- return 0;
- }
- /* Do we need to check exit policy? */
- if (!is_resolve && !connection_edge_is_rendezvous_stream(conn)) {
- struct in_addr in;
- uint32_t addr = 0;
- if (tor_inet_aton(conn->socks_request->address, &in))
- addr = ntohl(in.s_addr);
- if (router_exit_policy_all_routers_reject(addr, conn->socks_request->port,
- need_uptime)) {
- notice(LD_APP,
- "No Tor server exists that allows exit to %s:%d. Rejecting.",
- safe_str(conn->socks_request->address),
- conn->socks_request->port);
- return -1;
- }
- }
- /* is one already on the way? */
- circ = circuit_get_best(conn, 0, desired_circuit_purpose,
- need_uptime, need_internal);
- if (!circ) {
- extend_info_t *extend_info=NULL;
- uint8_t new_circ_purpose;
- if (desired_circuit_purpose == CIRCUIT_PURPOSE_C_INTRODUCE_ACK_WAIT) {
- /* need to pick an intro point */
- extend_info = rend_client_get_random_intro(conn->rend_query);
- if (!extend_info) {
- info(LD_REND,
- "No intro points for '%s': refetching service descriptor.",
- safe_str(conn->rend_query));
- rend_client_refetch_renddesc(conn->rend_query);
- conn->state = AP_CONN_STATE_RENDDESC_WAIT;
- return 0;
- }
- info(LD_REND,"Chose '%s' as intro point for '%s'.",
- extend_info->nickname, safe_str(conn->rend_query));
- }
- /* If we have specified a particular exit node for our
- * connection, then be sure to open a circuit to that exit node.
- */
- if (desired_circuit_purpose == CIRCUIT_PURPOSE_C_GENERAL) {
- if (conn->chosen_exit_name) {
- routerinfo_t *r;
- if (!(r = router_get_by_nickname(conn->chosen_exit_name, 1))) {
- /*XXXX NM domain? */
- notice(LD_CIRC,"Requested exit point '%s' is not known. Closing.",
- conn->chosen_exit_name);
- return -1;
- }
- extend_info = extend_info_from_router(r);
- }
- }
- if (desired_circuit_purpose == CIRCUIT_PURPOSE_C_REND_JOINED)
- new_circ_purpose = CIRCUIT_PURPOSE_C_ESTABLISH_REND;
- else if (desired_circuit_purpose == CIRCUIT_PURPOSE_C_INTRODUCE_ACK_WAIT)
- new_circ_purpose = CIRCUIT_PURPOSE_C_INTRODUCING;
- else
- new_circ_purpose = desired_circuit_purpose;
- circ = circuit_launch_by_extend_info(
- new_circ_purpose, extend_info, need_uptime, 1, need_internal);
- if (extend_info)
- extend_info_free(extend_info);
- if (desired_circuit_purpose != CIRCUIT_PURPOSE_C_GENERAL) {
- /* help predict this next time */
- rep_hist_note_used_internal(time(NULL), need_uptime, 1);
- if (circ) {
- /* write the service_id into circ */
- strlcpy(circ->rend_query, conn->rend_query, sizeof(circ->rend_query));
- if (circ->purpose == CIRCUIT_PURPOSE_C_ESTABLISH_REND &&
- circ->state == CIRCUIT_STATE_OPEN)
- rend_client_rendcirc_has_opened(circ);
- }
- }
- }
- if (!circ)
- info(LD_APP,
- "No safe circuit (purpose %d) ready for edge connection; delaying.",
- desired_circuit_purpose);
- *circp = circ;
- return 0;
- }
- /** Attach the AP stream <b>apconn</b> to circ's linked list of
- * p_streams. Also set apconn's cpath_layer to the last hop in
- * circ's cpath.
- */
- static void
- link_apconn_to_circ(connection_t *apconn, circuit_t *circ)
- {
- /* add it into the linked list of streams on this circuit */
- debug(LD_APP|LD_CIRC, "attaching new conn to circ. n_circ_id %d.",
- circ->n_circ_id);
- /* reset it, so we can measure circ timeouts */
- apconn->timestamp_lastread = time(NULL);
- apconn->next_stream = circ->p_streams;
- apconn->on_circuit = circ;
- /* assert_connection_ok(conn, time(NULL)); */
- circ->p_streams = apconn;
- tor_assert(CIRCUIT_IS_ORIGIN(circ));
- tor_assert(circ->cpath);
- tor_assert(circ->cpath->prev);
- tor_assert(circ->cpath->prev->state == CPATH_STATE_OPEN);
- apconn->cpath_layer = circ->cpath->prev;
- }
- /** If an exit wasn't specifically chosen, save the history for future
- * use. */
- static void
- consider_recording_trackhost(connection_t *conn, circuit_t *circ)
- {
- int found_needle = 0;
- char *str;
- or_options_t *options = get_options();
- size_t len;
- char *new_address;
- char fp[HEX_DIGEST_LEN+1];
- /* Search the addressmap for this conn's destination. */
- /* If he's not in the address map.. */
- if (!options->TrackHostExits ||
- addressmap_already_mapped(conn->socks_request->address))
- return; /* nothing to track, or already mapped */
- SMARTLIST_FOREACH(options->TrackHostExits, const char *, cp, {
- if (cp[0] == '.') { /* match end */
- /* XXX strstr is probably really bad here */
- if ((str = strstr(conn->socks_request->address, &cp[1]))) {
- if (str == conn->socks_request->address
- || strcmp(str, &cp[1]) == 0) {
- found_needle = 1;
- }
- }
- } else if (strcmp(cp, conn->socks_request->address) == 0) {
- found_needle = 1;
- }
- });
- if (!found_needle || !circ->build_state->chosen_exit)
- return;
- /* write down the fingerprint of the chosen exit, not the nickname,
- * because the chosen exit might not be verified. */
- base16_encode(fp, sizeof(fp),
- circ->build_state->chosen_exit->identity_digest, DIGEST_LEN);
- /* Add this exit/hostname pair to the addressmap. */
- len = strlen(conn->socks_request->address) + 1 /* '.' */ +
- strlen(fp) + 1 /* '.' */ +
- strlen("exit") + 1 /* '\0' */;
- new_address = tor_malloc(len);
- tor_snprintf(new_address, len, "%s.%s.exit",
- conn->socks_request->address, fp);
- addressmap_register(conn->socks_request->address, new_address,
- time(NULL) + options->TrackHostExitsExpire);
- }
- /** Attempt to attach the connection <b>conn</b> to <b>circ</b>, and
- * send a begin or resolve cell as appropriate. Return values are as
- * for connection_ap_handshake_attach_circuit. */
- int
- connection_ap_handshake_attach_chosen_circuit(connection_t *conn,
- circuit_t *circ)
- {
- tor_assert(conn);
- tor_assert(conn->type == CONN_TYPE_AP);
- tor_assert(conn->state == AP_CONN_STATE_CIRCUIT_WAIT ||
- conn->state == AP_CONN_STATE_CONTROLLER_WAIT);
- tor_assert(conn->socks_request);
- tor_assert(circ);
- tor_assert(circ->state == CIRCUIT_STATE_OPEN);
- conn->state = AP_CONN_STATE_CIRCUIT_WAIT;
- if (!circ->timestamp_dirty)
- circ->timestamp_dirty = time(NULL);
- link_apconn_to_circ(conn, circ);
- tor_assert(conn->socks_request);
- if (conn->socks_request->command == SOCKS_COMMAND_CONNECT) {
- consider_recording_trackhost(conn, circ);
- if (connection_ap_handshake_send_begin(conn, circ)<0)
- return -1;
- } else {
- if (connection_ap_handshake_send_resolve(conn, circ)<0)
- return -1;
- }
- return 1;
- }
- /** Try to find a safe live circuit for CONN_TYPE_AP connection conn. If
- * we don't find one: if conn cannot be handled by any known nodes,
- * warn and return -1 (conn needs to die);
- * else launch new circuit (if necessary) and return 0.
- * Otherwise, associate conn with a safe live circuit, do the
- * right next step, and return 1.
- */
- int
- connection_ap_handshake_attach_circuit(connection_t *conn)
- {
- int retval;
- int conn_age;
- tor_assert(conn);
- tor_assert(conn->type == CONN_TYPE_AP);
- tor_assert(conn->state == AP_CONN_STATE_CIRCUIT_WAIT);
- tor_assert(conn->socks_request);
- conn_age = time(NULL) - conn->timestamp_created;
- if (conn_age > CONN_AP_MAX_ATTACH_DELAY) {
- notice(LD_APP,
- "Tried for %d seconds to get a connection to %s:%d. Giving up.",
- conn_age, safe_str(conn->socks_request->address),
- conn->socks_request->port);
- return -1;
- }
- if (!connection_edge_is_rendezvous_stream(conn)) { /* we're a general conn */
- circuit_t *circ=NULL;
- if (conn->chosen_exit_name) {
- routerinfo_t *router = router_get_by_nickname(conn->chosen_exit_name, 1);
- if (!router) {
- warn(LD_APP,"Requested exit point '%s' is not known. Closing.",
- conn->chosen_exit_name);
- return -1;
- }
- if (!connection_ap_can_use_exit(conn, router)) {
- warn(LD_APP,"Requested exit point '%s' would refuse request. Closing.",
- conn->chosen_exit_name);
- return -1;
- }
- }
- /* find the circuit that we should use, if there is one. */
- retval = circuit_get_open_circ_or_launch(
- conn, CIRCUIT_PURPOSE_C_GENERAL, &circ);
- if (retval < 1)
- return retval;
- debug(LD_APP|LD_CIRC,"Attaching apconn to circ %d (stream %d sec old).",
- circ->n_circ_id, conn_age);
- /* here, print the circ's path. so people can figure out which circs are
- * sucking. */
- circuit_log_path(LOG_INFO,LD_APP|LD_CIRC,circ);
- /* We have found a suitable circuit for our conn. Hurray. */
- return connection_ap_handshake_attach_chosen_circuit(conn, circ);
- } else { /* we're a rendezvous conn */
- circuit_t *rendcirc=NULL, *introcirc=NULL;
- tor_assert(!conn->cpath_layer);
- /* start by finding a rendezvous circuit for us */
- retval = circuit_get_open_circ_or_launch(
- conn, CIRCUIT_PURPOSE_C_REND_JOINED, &rendcirc);
- if (retval < 0) return -1; /* failed */
- if (retval > 0) {
- tor_assert(rendcirc);
- /* one is already established, attach */
- info(LD_REND,
- "rend joined circ %d already here. attaching. (stream %d sec old)",
- rendcirc->n_circ_id, conn_age);
- /* Mark rendezvous circuits as 'newly dirty' every time you use
- * them, since the process of rebuilding a rendezvous circ is so
- * expensive. There is a tradeoffs between linkability and
- * feasibility, at this point.
- */
- rendcirc->timestamp_dirty = time(NULL);
- link_apconn_to_circ(conn, rendcirc);
- if (connection_ap_handshake_send_begin(conn, rendcirc) < 0)
- return 0; /* already marked, let them fade away */
- return 1;
- }
- if (rendcirc && (rendcirc->purpose ==
- CIRCUIT_PURPOSE_C_REND_READY_INTRO_ACKED)) {
- info(LD_REND,
- "pending-join circ %d already here, with intro ack. "
- "Stalling. (stream %d sec old)",
- rendcirc->n_circ_id, conn_age);
- return 0;
- }
- /* it's on its way. find an intro circ. */
- retval = circuit_get_open_circ_or_launch(
- conn, CIRCUIT_PURPOSE_C_INTRODUCE_ACK_WAIT, &introcirc);
- if (retval < 0) return -1; /* failed */
- if (retval > 0) {
- /* one has already sent the intro. keep waiting. */
- tor_assert(introcirc);
- info(LD_REND, "Intro circ %d present and awaiting ack (rend %d). "
- "Stalling. (stream %d sec old)",
- introcirc->n_circ_id, rendcirc ? rendcirc->n_circ_id : 0, conn_age);
- return 0;
- }
- /* now rendcirc and introcirc are each either undefined or not finished */
- if (rendcirc && introcirc &&
- rendcirc->purpose == CIRCUIT_PURPOSE_C_REND_READY) {
- info(LD_REND,"ready rend circ %d already here (no intro-ack yet on "
- "intro %d). (stream %d sec old)",
- rendcirc->n_circ_id, introcirc->n_circ_id, conn_age);
- tor_assert(introcirc->purpose == CIRCUIT_PURPOSE_C_INTRODUCING);
- if (introcirc->state == CIRCUIT_STATE_OPEN) {
- info(LD_REND,"found open intro circ %d (rend %d); sending "
- "introduction. (stream %d sec old)",
- introcirc->n_circ_id, rendcirc->n_circ_id, conn_age);
- if (rend_client_send_introduction(introcirc, rendcirc) < 0) {
- return -1;
- }
- rendcirc->timestamp_dirty = time(NULL);
- introcirc->timestamp_dirty = time(NULL);
- assert_circuit_ok(rendcirc);
- assert_circuit_ok(introcirc);
- return 0;
- }
- }
- info(LD_REND, "Intro (%d) and rend (%d) circs are not both ready. "
- "Stalling conn. (%d sec old)",
- introcirc ? introcirc->n_circ_id : 0,
- rendcirc ? rendcirc->n_circ_id : 0, conn_age);
- return 0;
- }
- }
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