mirror of
https://gitlab.torproject.org/tpo/core/tor.git
synced 2024-11-11 13:43:47 +01:00
67d88a7d60
Conflicts: src/common/address.c src/common/compat_libevent.c src/common/memarea.c src/common/util.h src/or/buffers.c src/or/circuitbuild.c src/or/circuituse.c src/or/connection.c src/or/directory.c src/or/networkstatus.c src/or/or.h src/or/routerlist.c
1738 lines
64 KiB
C
1738 lines
64 KiB
C
/* Copyright (c) 2001 Matej Pfajfar.
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* Copyright (c) 2001-2004, Roger Dingledine.
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* Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
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* Copyright (c) 2007-2011, The Tor Project, Inc. */
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/* See LICENSE for licensing information */
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/**
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* \file circuituse.c
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* \brief Launch the right sort of circuits and attach streams to them.
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**/
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#include "or.h"
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#include "circuitbuild.h"
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#include "circuitlist.h"
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#include "circuituse.h"
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#include "config.h"
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#include "connection.h"
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#include "connection_edge.h"
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#include "control.h"
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#include "nodelist.h"
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#include "policies.h"
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#include "rendclient.h"
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#include "rendcommon.h"
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#include "rendservice.h"
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#include "rephist.h"
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#include "router.h"
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#include "routerlist.h"
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/********* START VARIABLES **********/
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extern circuit_t *global_circuitlist; /* from circuitlist.c */
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/********* END VARIABLES ************/
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static void circuit_expire_old_circuits_clientside(void);
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static void circuit_increment_failure_count(void);
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/** Return 1 if <b>circ</b> could be returned by circuit_get_best().
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* Else return 0.
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*/
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static int
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circuit_is_acceptable(circuit_t *circ, edge_connection_t *conn,
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int must_be_open, uint8_t purpose,
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int need_uptime, int need_internal,
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time_t now)
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{
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const node_t *exitnode;
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cpath_build_state_t *build_state;
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tor_assert(circ);
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tor_assert(conn);
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tor_assert(conn->socks_request);
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if (!CIRCUIT_IS_ORIGIN(circ))
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return 0; /* this circ doesn't start at us */
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if (must_be_open && (circ->state != CIRCUIT_STATE_OPEN || !circ->n_conn))
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return 0; /* ignore non-open circs */
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if (circ->marked_for_close)
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return 0;
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/* if this circ isn't our purpose, skip. */
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if (purpose == CIRCUIT_PURPOSE_C_REND_JOINED && !must_be_open) {
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if (circ->purpose != CIRCUIT_PURPOSE_C_ESTABLISH_REND &&
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circ->purpose != CIRCUIT_PURPOSE_C_REND_READY &&
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circ->purpose != CIRCUIT_PURPOSE_C_REND_READY_INTRO_ACKED &&
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circ->purpose != CIRCUIT_PURPOSE_C_REND_JOINED)
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return 0;
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} else if (purpose == CIRCUIT_PURPOSE_C_INTRODUCE_ACK_WAIT &&
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!must_be_open) {
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if (circ->purpose != CIRCUIT_PURPOSE_C_INTRODUCING &&
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circ->purpose != CIRCUIT_PURPOSE_C_INTRODUCE_ACK_WAIT)
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return 0;
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} else {
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if (purpose != circ->purpose)
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return 0;
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}
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if (purpose == CIRCUIT_PURPOSE_C_GENERAL)
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if (circ->timestamp_dirty &&
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circ->timestamp_dirty+get_options()->MaxCircuitDirtiness <= now)
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return 0;
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/* decide if this circ is suitable for this conn */
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/* for rend circs, circ->cpath->prev is not the last router in the
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* circuit, it's the magical extra bob hop. so just check the nickname
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* of the one we meant to finish at.
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*/
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build_state = TO_ORIGIN_CIRCUIT(circ)->build_state;
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exitnode = build_state_get_exit_node(build_state);
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if (need_uptime && !build_state->need_uptime)
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return 0;
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if (need_internal != build_state->is_internal)
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return 0;
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if (purpose == CIRCUIT_PURPOSE_C_GENERAL) {
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if (!exitnode && !build_state->onehop_tunnel) {
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log_debug(LD_CIRC,"Not considering circuit with unknown router.");
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return 0; /* this circuit is screwed and doesn't know it yet,
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* or is a rendezvous circuit. */
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}
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if (build_state->onehop_tunnel) {
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if (!conn->want_onehop) {
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log_debug(LD_CIRC,"Skipping one-hop circuit.");
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return 0;
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}
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tor_assert(conn->chosen_exit_name);
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if (build_state->chosen_exit) {
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char digest[DIGEST_LEN];
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if (hexdigest_to_digest(conn->chosen_exit_name, digest) < 0)
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return 0; /* broken digest, we don't want it */
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if (memcmp(digest, build_state->chosen_exit->identity_digest,
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DIGEST_LEN))
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return 0; /* this is a circuit to somewhere else */
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if (tor_digest_is_zero(digest)) {
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/* we don't know the digest; have to compare addr:port */
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tor_addr_t addr;
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int r = tor_addr_from_str(&addr, conn->socks_request->address);
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if (r < 0 ||
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!tor_addr_eq(&build_state->chosen_exit->addr, &addr) ||
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build_state->chosen_exit->port != conn->socks_request->port)
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return 0;
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}
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}
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} else {
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if (conn->want_onehop) {
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/* don't use three-hop circuits -- that could hurt our anonymity. */
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return 0;
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}
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}
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if (exitnode && !connection_ap_can_use_exit(conn, exitnode, 0)) {
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/* can't exit from this router */
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return 0;
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}
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} else { /* not general */
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origin_circuit_t *ocirc = TO_ORIGIN_CIRCUIT(circ);
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if ((conn->rend_data && !ocirc->rend_data) ||
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(!conn->rend_data && ocirc->rend_data) ||
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(conn->rend_data && ocirc->rend_data &&
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rend_cmp_service_ids(conn->rend_data->onion_address,
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ocirc->rend_data->onion_address))) {
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/* this circ is not for this conn */
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return 0;
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}
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}
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return 1;
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}
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/** Return 1 if circuit <b>a</b> is better than circuit <b>b</b> for
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* <b>purpose</b>, and return 0 otherwise. Used by circuit_get_best.
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*/
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static int
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circuit_is_better(circuit_t *a, circuit_t *b, uint8_t purpose)
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{
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switch (purpose) {
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case CIRCUIT_PURPOSE_C_GENERAL:
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/* if it's used but less dirty it's best;
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* else if it's more recently created it's best
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*/
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if (b->timestamp_dirty) {
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if (a->timestamp_dirty &&
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a->timestamp_dirty > b->timestamp_dirty)
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return 1;
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} else {
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if (a->timestamp_dirty ||
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timercmp(&a->timestamp_created, &b->timestamp_created, >))
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return 1;
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if (CIRCUIT_IS_ORIGIN(b) &&
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TO_ORIGIN_CIRCUIT(b)->build_state->is_internal)
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return 1;
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}
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break;
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case CIRCUIT_PURPOSE_C_INTRODUCE_ACK_WAIT:
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/* the closer it is to ack_wait the better it is */
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if (a->purpose > b->purpose)
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return 1;
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break;
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case CIRCUIT_PURPOSE_C_REND_JOINED:
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/* the closer it is to rend_joined the better it is */
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if (a->purpose > b->purpose)
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return 1;
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break;
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}
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return 0;
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}
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/** Find the best circ that conn can use, preferably one which is
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* dirty. Circ must not be too old.
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*
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* Conn must be defined.
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*
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* If must_be_open, ignore circs not in CIRCUIT_STATE_OPEN.
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*
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* circ_purpose specifies what sort of circuit we must have.
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* It can be C_GENERAL, C_INTRODUCE_ACK_WAIT, or C_REND_JOINED.
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*
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* If it's REND_JOINED and must_be_open==0, then return the closest
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* rendezvous-purposed circuit that you can find.
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*
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* If it's INTRODUCE_ACK_WAIT and must_be_open==0, then return the
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* closest introduce-purposed circuit that you can find.
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*/
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static origin_circuit_t *
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circuit_get_best(edge_connection_t *conn, int must_be_open, uint8_t purpose,
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int need_uptime, int need_internal)
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{
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circuit_t *circ, *best=NULL;
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struct timeval now;
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int intro_going_on_but_too_old = 0;
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tor_assert(conn);
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tor_assert(purpose == CIRCUIT_PURPOSE_C_GENERAL ||
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purpose == CIRCUIT_PURPOSE_C_INTRODUCE_ACK_WAIT ||
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purpose == CIRCUIT_PURPOSE_C_REND_JOINED);
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tor_gettimeofday(&now);
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for (circ=global_circuitlist;circ;circ = circ->next) {
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if (!circuit_is_acceptable(circ,conn,must_be_open,purpose,
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need_uptime,need_internal,now.tv_sec))
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continue;
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if (purpose == CIRCUIT_PURPOSE_C_INTRODUCE_ACK_WAIT &&
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!must_be_open && circ->state != CIRCUIT_STATE_OPEN &&
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tv_mdiff(&now, &circ->timestamp_created) > circ_times.timeout_ms) {
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intro_going_on_but_too_old = 1;
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continue;
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}
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/* now this is an acceptable circ to hand back. but that doesn't
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* mean it's the *best* circ to hand back. try to decide.
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*/
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if (!best || circuit_is_better(circ,best,purpose))
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best = circ;
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}
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if (!best && intro_going_on_but_too_old)
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log_info(LD_REND|LD_CIRC, "There is an intro circuit being created "
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"right now, but it has already taken quite a while. Starting "
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"one in parallel.");
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return best ? TO_ORIGIN_CIRCUIT(best) : NULL;
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}
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/** Check whether, according to the policies in <b>options</b>, the
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* circuit <b>circ</b> makes sense. */
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/* XXXX currently only checks Exclude{Exit}Nodes. It should check more. */
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int
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circuit_conforms_to_options(const origin_circuit_t *circ,
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const or_options_t *options)
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{
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const crypt_path_t *cpath, *cpath_next = NULL;
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for (cpath = circ->cpath; cpath && cpath_next != circ->cpath;
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cpath = cpath_next) {
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cpath_next = cpath->next;
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if (routerset_contains_extendinfo(options->ExcludeNodes,
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cpath->extend_info))
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return 0;
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if (cpath->next == circ->cpath) {
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/* This is apparently the exit node. */
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if (routerset_contains_extendinfo(options->ExcludeExitNodes,
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cpath->extend_info))
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return 0;
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}
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}
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return 1;
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}
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/** Close all circuits that start at us, aren't open, and were born
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* at least CircuitBuildTimeout seconds ago.
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*/
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void
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circuit_expire_building(void)
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{
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circuit_t *victim, *next_circ = global_circuitlist;
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/* circ_times.timeout_ms and circ_times.close_ms are from
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* circuit_build_times_get_initial_timeout() if we haven't computed
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* custom timeouts yet */
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struct timeval general_cutoff, begindir_cutoff, fourhop_cutoff,
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cannibalize_cutoff, close_cutoff, extremely_old_cutoff;
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struct timeval now;
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struct timeval introcirc_cutoff;
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cpath_build_state_t *build_state;
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tor_gettimeofday(&now);
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#define SET_CUTOFF(target, msec) do { \
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long ms = tor_lround(msec); \
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struct timeval diff; \
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diff.tv_sec = ms / 1000; \
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diff.tv_usec = (int)((ms % 1000) * 1000); \
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timersub(&now, &diff, &target); \
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} while (0)
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SET_CUTOFF(general_cutoff, circ_times.timeout_ms);
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SET_CUTOFF(begindir_cutoff, circ_times.timeout_ms / 2.0);
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SET_CUTOFF(fourhop_cutoff, circ_times.timeout_ms * (4/3.0));
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SET_CUTOFF(cannibalize_cutoff, circ_times.timeout_ms / 2.0);
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SET_CUTOFF(close_cutoff, circ_times.close_ms);
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SET_CUTOFF(extremely_old_cutoff, circ_times.close_ms*2 + 1000);
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introcirc_cutoff = begindir_cutoff;
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while (next_circ) {
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struct timeval cutoff;
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victim = next_circ;
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next_circ = next_circ->next;
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if (!CIRCUIT_IS_ORIGIN(victim) || /* didn't originate here */
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victim->marked_for_close) /* don't mess with marked circs */
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continue;
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build_state = TO_ORIGIN_CIRCUIT(victim)->build_state;
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if (build_state && build_state->onehop_tunnel)
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cutoff = begindir_cutoff;
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else if (build_state && build_state->desired_path_len == 4
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&& !TO_ORIGIN_CIRCUIT(victim)->has_opened)
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cutoff = fourhop_cutoff;
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else if (TO_ORIGIN_CIRCUIT(victim)->has_opened)
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cutoff = cannibalize_cutoff;
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else if (victim->purpose == CIRCUIT_PURPOSE_C_INTRODUCING)
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cutoff = introcirc_cutoff;
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else if (victim->purpose == CIRCUIT_PURPOSE_C_MEASURE_TIMEOUT)
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cutoff = close_cutoff;
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else
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cutoff = general_cutoff;
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if (timercmp(&victim->timestamp_created, &cutoff, >))
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continue; /* it's still young, leave it alone */
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#if 0
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/* some debug logs, to help track bugs */
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if (victim->purpose == CIRCUIT_PURPOSE_C_INTRODUCING &&
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victim->timestamp_created.tv_sec <= introcirc_cutoff &&
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victim->timestamp_created.tv_sec > general_cutoff)
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log_info(LD_REND|LD_CIRC, "Timing out introduction circuit which we "
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"would not have done if it had been a general circuit.");
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if (victim->purpose >= CIRCUIT_PURPOSE_C_INTRODUCING &&
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victim->purpose <= CIRCUIT_PURPOSE_C_REND_READY_INTRO_ACKED) {
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if (!victim->timestamp_dirty)
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log_fn(LOG_DEBUG,"Considering %sopen purpose %d to %s (circid %d)."
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"(clean).",
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victim->state == CIRCUIT_STATE_OPEN ? "" : "non",
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victim->purpose, victim->build_state->chosen_exit_name,
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victim->n_circ_id);
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else
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log_fn(LOG_DEBUG,"Considering %sopen purpose %d to %s (circid %d). "
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"%d secs since dirty.",
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victim->state == CIRCUIT_STATE_OPEN ? "" : "non",
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victim->purpose, victim->build_state->chosen_exit_name,
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victim->n_circ_id,
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(int)(now - victim->timestamp_dirty));
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}
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#endif
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/* if circ is !open, or if it's open but purpose is a non-finished
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* intro or rend, then mark it for close */
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if (victim->state == CIRCUIT_STATE_OPEN) {
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switch (victim->purpose) {
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default: /* most open circuits can be left alone. */
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continue; /* yes, continue inside a switch refers to the nearest
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* enclosing loop. C is smart. */
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case CIRCUIT_PURPOSE_C_ESTABLISH_REND:
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case CIRCUIT_PURPOSE_C_INTRODUCING:
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case CIRCUIT_PURPOSE_S_ESTABLISH_INTRO:
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break; /* too old, need to die */
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case CIRCUIT_PURPOSE_C_REND_READY:
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/* it's a rend_ready circ -- has it already picked a query? */
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/* c_rend_ready circs measure age since timestamp_dirty,
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* because that's set when they switch purposes
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*/
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if (TO_ORIGIN_CIRCUIT(victim)->rend_data ||
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victim->timestamp_dirty > cutoff.tv_sec)
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continue;
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break;
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case CIRCUIT_PURPOSE_C_REND_READY_INTRO_ACKED:
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case CIRCUIT_PURPOSE_C_INTRODUCE_ACK_WAIT:
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/* rend and intro circs become dirty each time they
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* make an introduction attempt. so timestamp_dirty
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* will reflect the time since the last attempt.
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*/
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if (victim->timestamp_dirty > cutoff.tv_sec)
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continue;
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break;
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}
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} else { /* circuit not open, consider recording failure as timeout */
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int first_hop_succeeded = TO_ORIGIN_CIRCUIT(victim)->cpath &&
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TO_ORIGIN_CIRCUIT(victim)->cpath->state == CPATH_STATE_OPEN;
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if (TO_ORIGIN_CIRCUIT(victim)->p_streams != NULL) {
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log_warn(LD_BUG, "Circuit %d (purpose %d) has timed out, "
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"yet has attached streams!",
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TO_ORIGIN_CIRCUIT(victim)->global_identifier,
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victim->purpose);
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tor_fragile_assert();
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continue;
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}
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if (circuit_timeout_want_to_count_circ(TO_ORIGIN_CIRCUIT(victim)) &&
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circuit_build_times_enough_to_compute(&circ_times)) {
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/* Circuits are allowed to last longer for measurement.
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* Switch their purpose and wait. */
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if (victim->purpose != CIRCUIT_PURPOSE_C_MEASURE_TIMEOUT) {
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control_event_circuit_status(TO_ORIGIN_CIRCUIT(victim),
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CIRC_EVENT_FAILED,
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END_CIRC_REASON_TIMEOUT);
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victim->purpose = CIRCUIT_PURPOSE_C_MEASURE_TIMEOUT;
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/* Record this failure to check for too many timeouts
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* in a row. This function does not record a time value yet
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* (we do that later); it only counts the fact that we did
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* have a timeout. */
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circuit_build_times_count_timeout(&circ_times,
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first_hop_succeeded);
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continue;
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}
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/*
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* If the circuit build time is much greater than we would have cut
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* it off at, we probably had a suspend event along this codepath,
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* and we should discard the value.
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*/
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if (timercmp(&victim->timestamp_created, &extremely_old_cutoff, <)) {
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log_notice(LD_CIRC,
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"Extremely large value for circuit build timeout: %lds. "
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"Assuming clock jump. Purpose %d",
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(long)(now.tv_sec - victim->timestamp_created.tv_sec),
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victim->purpose);
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} else if (circuit_build_times_count_close(&circ_times,
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first_hop_succeeded,
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victim->timestamp_created.tv_sec)) {
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circuit_build_times_set_timeout(&circ_times);
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}
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}
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}
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if (victim->n_conn)
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log_info(LD_CIRC,"Abandoning circ %s:%d:%d (state %d:%s, purpose %d)",
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victim->n_conn->_base.address, victim->n_conn->_base.port,
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victim->n_circ_id,
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victim->state, circuit_state_to_string(victim->state),
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victim->purpose);
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else
|
|
log_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,TO_ORIGIN_CIRCUIT(victim));
|
|
if (victim->purpose == CIRCUIT_PURPOSE_C_MEASURE_TIMEOUT)
|
|
circuit_mark_for_close(victim, END_CIRC_REASON_MEASUREMENT_EXPIRED);
|
|
else
|
|
circuit_mark_for_close(victim, END_CIRC_REASON_TIMEOUT);
|
|
}
|
|
}
|
|
|
|
/** 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,
|
|
MIN_CIRCUITS_HANDLING_STREAM)) {
|
|
// log_debug(LD_CIRC,"Port %d is already being handled; removing.", port);
|
|
smartlist_del(needed_ports, i--);
|
|
tor_free(port);
|
|
} else {
|
|
log_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(edge_connection_t *conn,
|
|
uint16_t port, int min)
|
|
{
|
|
circuit_t *circ;
|
|
const node_t *exitnode;
|
|
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->timestamp_dirty ||
|
|
circ->timestamp_dirty + get_options()->MaxCircuitDirtiness > now)) {
|
|
cpath_build_state_t *build_state = TO_ORIGIN_CIRCUIT(circ)->build_state;
|
|
if (build_state->is_internal || build_state->onehop_tunnel)
|
|
continue;
|
|
|
|
exitnode = build_state_get_exit_node(build_state);
|
|
if (exitnode && (!need_uptime || build_state->need_uptime)) {
|
|
int ok;
|
|
if (conn) {
|
|
ok = connection_ap_can_use_exit(conn, exitnode, 0);
|
|
} else {
|
|
addr_policy_result_t r;
|
|
r = compare_addr_to_node_policy(0, port, exitnode);
|
|
ok = r != ADDR_POLICY_REJECTED && r != ADDR_POLICY_PROBABLY_REJECTED;
|
|
}
|
|
if (ok) {
|
|
if (++num >= min)
|
|
return 1;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/** Don't keep more than this many unused open circuits around. */
|
|
#define MAX_UNUSED_OPEN_CIRCUITS 14
|
|
|
|
/** 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 put an upper bound on the total number of circuits.
|
|
*/
|
|
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);
|
|
int flags = 0;
|
|
|
|
/* First, count how many of each type of circuit we have already. */
|
|
for (circ=global_circuitlist;circ;circ = circ->next) {
|
|
cpath_build_state_t *build_state;
|
|
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 */
|
|
build_state = TO_ORIGIN_CIRCUIT(circ)->build_state;
|
|
if (build_state->onehop_tunnel)
|
|
continue;
|
|
num++;
|
|
if (build_state->is_internal)
|
|
num_internal++;
|
|
if (build_state->need_uptime && 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)) {
|
|
if (port_needs_uptime)
|
|
flags |= CIRCLAUNCH_NEED_UPTIME;
|
|
if (port_needs_capacity)
|
|
flags |= CIRCLAUNCH_NEED_CAPACITY;
|
|
log_info(LD_CIRC,
|
|
"Have %d clean circs (%d internal), need another exit circ.",
|
|
num, num_internal);
|
|
circuit_launch(CIRCUIT_PURPOSE_C_GENERAL, flags);
|
|
return;
|
|
}
|
|
|
|
/* Third, see if we need any more hidden service (server) circuits. */
|
|
if (num_rend_services() && num_uptime_internal < 3) {
|
|
flags = (CIRCLAUNCH_NEED_CAPACITY | CIRCLAUNCH_NEED_UPTIME |
|
|
CIRCLAUNCH_IS_INTERNAL);
|
|
log_info(LD_CIRC,
|
|
"Have %d clean circs (%d internal), need another internal "
|
|
"circ for my hidden service.",
|
|
num, num_internal);
|
|
circuit_launch(CIRCUIT_PURPOSE_C_GENERAL, flags);
|
|
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)) {
|
|
if (hidserv_needs_uptime)
|
|
flags |= CIRCLAUNCH_NEED_UPTIME;
|
|
if (hidserv_needs_capacity)
|
|
flags |= CIRCLAUNCH_NEED_CAPACITY;
|
|
flags |= CIRCLAUNCH_IS_INTERNAL;
|
|
log_info(LD_CIRC,
|
|
"Have %d clean circs (%d uptime-internal, %d internal), need"
|
|
" another hidden service circ.",
|
|
num, num_uptime_internal, num_internal);
|
|
circuit_launch(CIRCUIT_PURPOSE_C_GENERAL, flags);
|
|
return;
|
|
}
|
|
|
|
/* Finally, check to see if we still need more circuits to learn
|
|
* a good build timeout. But if we're close to our max number we
|
|
* want, don't do another -- we want to leave a few slots open so
|
|
* we can still build circuits preemptively as needed. */
|
|
if (num < MAX_UNUSED_OPEN_CIRCUITS-2 &&
|
|
circuit_build_times_needs_circuits_now(&circ_times)) {
|
|
flags = CIRCLAUNCH_NEED_CAPACITY;
|
|
log_info(LD_CIRC,
|
|
"Have %d clean circs need another buildtime test circ.", num);
|
|
circuit_launch(CIRCUIT_PURPOSE_C_GENERAL, flags);
|
|
return;
|
|
}
|
|
}
|
|
|
|
/** Build a new test circuit every 5 minutes */
|
|
#define TESTING_CIRCUIT_INTERVAL 300
|
|
|
|
/** This function is called once a second, if router_have_min_dir_info() is
|
|
* true. 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 time_t time_to_new_circuit = 0;
|
|
or_options_t *options = get_options();
|
|
|
|
/* launch a new circ for any pending streams that need one */
|
|
connection_ap_attach_pending();
|
|
|
|
/* make sure any hidden services have enough intro points */
|
|
rend_services_introduce();
|
|
|
|
if (time_to_new_circuit < now) {
|
|
circuit_reset_failure_count(1);
|
|
time_to_new_circuit = now + options->NewCircuitPeriod;
|
|
if (proxy_mode(get_options()))
|
|
addressmap_clean(now);
|
|
circuit_expire_old_circuits_clientside();
|
|
|
|
#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.tv_sec + TESTING_CIRCUIT_INTERVAL < now) {
|
|
log_fn(LOG_INFO,"Creating a new testing circuit.");
|
|
circuit_launch(CIRCUIT_PURPOSE_C_GENERAL, 0);
|
|
}
|
|
#endif
|
|
}
|
|
if (!options->DisablePredictedCircuits)
|
|
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, edge_connection_t *conn)
|
|
{
|
|
edge_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 (CIRCUIT_IS_ORIGIN(circ)) {
|
|
origin_circuit_t *origin_circ = TO_ORIGIN_CIRCUIT(circ);
|
|
if (conn == origin_circ->p_streams) {
|
|
origin_circ->p_streams = conn->next_stream;
|
|
return;
|
|
}
|
|
|
|
for (prevconn = origin_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;
|
|
}
|
|
} else {
|
|
or_circuit_t *or_circ = TO_OR_CIRCUIT(circ);
|
|
if (conn == or_circ->n_streams) {
|
|
or_circ->n_streams = conn->next_stream;
|
|
return;
|
|
}
|
|
if (conn == or_circ->resolving_streams) {
|
|
or_circ->resolving_streams = conn->next_stream;
|
|
return;
|
|
}
|
|
|
|
for (prevconn = or_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 = or_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;
|
|
}
|
|
}
|
|
|
|
log_warn(LD_BUG,"Edge connection not in circuit's list.");
|
|
/* Don't give an error here; it's harmless. */
|
|
tor_fragile_assert();
|
|
}
|
|
|
|
/** If we haven't yet decided on a good timeout value for circuit
|
|
* building, we close idles circuits aggressively so we can get more
|
|
* data points. */
|
|
#define IDLE_TIMEOUT_WHILE_LEARNING (10*60)
|
|
|
|
/** Find each circuit that has been unused for too long, or dirty
|
|
* for too long and has no streams on it: mark it for close.
|
|
*/
|
|
static void
|
|
circuit_expire_old_circuits_clientside(void)
|
|
{
|
|
circuit_t *circ;
|
|
struct timeval cutoff, now;
|
|
|
|
tor_gettimeofday(&now);
|
|
cutoff = now;
|
|
|
|
if (circuit_build_times_needs_circuits(&circ_times)) {
|
|
/* Circuits should be shorter lived if we need more of them
|
|
* for learning a good build timeout */
|
|
cutoff.tv_sec -= IDLE_TIMEOUT_WHILE_LEARNING;
|
|
} else {
|
|
cutoff.tv_sec -= get_options()->CircuitIdleTimeout;
|
|
}
|
|
|
|
for (circ = global_circuitlist; circ; circ = circ->next) {
|
|
if (circ->marked_for_close || !CIRCUIT_IS_ORIGIN(circ))
|
|
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.tv_sec &&
|
|
!TO_ORIGIN_CIRCUIT(circ)->p_streams /* nothing attached */ ) {
|
|
log_debug(LD_CIRC, "Closing n_circ_id %d (dirty %ld sec ago, "
|
|
"purpose %d)",
|
|
circ->n_circ_id, (long)(now.tv_sec - circ->timestamp_dirty),
|
|
circ->purpose);
|
|
circuit_mark_for_close(circ, END_CIRC_REASON_FINISHED);
|
|
} else if (!circ->timestamp_dirty && circ->state == CIRCUIT_STATE_OPEN) {
|
|
if (timercmp(&circ->timestamp_created, &cutoff, <)) {
|
|
if (circ->purpose == CIRCUIT_PURPOSE_C_GENERAL ||
|
|
circ->purpose == CIRCUIT_PURPOSE_C_MEASURE_TIMEOUT ||
|
|
circ->purpose == CIRCUIT_PURPOSE_S_ESTABLISH_INTRO ||
|
|
circ->purpose == CIRCUIT_PURPOSE_TESTING ||
|
|
(circ->purpose >= CIRCUIT_PURPOSE_C_INTRODUCING &&
|
|
circ->purpose <= CIRCUIT_PURPOSE_C_REND_READY_INTRO_ACKED) ||
|
|
circ->purpose == CIRCUIT_PURPOSE_S_CONNECT_REND) {
|
|
log_debug(LD_CIRC,
|
|
"Closing circuit that has been unused for %ld msec.",
|
|
tv_mdiff(&circ->timestamp_created, &now));
|
|
circuit_mark_for_close(circ, END_CIRC_REASON_FINISHED);
|
|
} else if (!TO_ORIGIN_CIRCUIT(circ)->is_ancient) {
|
|
/* Server-side rend joined circuits can end up really old, because
|
|
* they are reused by clients for longer than normal. The client
|
|
* controls their lifespan. (They never become dirty, because
|
|
* connection_exit_begin_conn() never marks anything as dirty.)
|
|
* Similarly, server-side intro circuits last a long time. */
|
|
if (circ->purpose != CIRCUIT_PURPOSE_S_REND_JOINED &&
|
|
circ->purpose != CIRCUIT_PURPOSE_S_INTRO) {
|
|
log_notice(LD_CIRC,
|
|
"Ancient non-dirty circuit %d is still around after "
|
|
"%ld milliseconds. Purpose: %d",
|
|
TO_ORIGIN_CIRCUIT(circ)->global_identifier,
|
|
tv_mdiff(&circ->timestamp_created, &now),
|
|
circ->purpose);
|
|
/* FFFF implement a new circuit_purpose_to_string() so we don't
|
|
* just print out a number for circ->purpose */
|
|
TO_ORIGIN_CIRCUIT(circ)->is_ancient = 1;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/** How long do we wait before killing circuits with the properties
|
|
* described below?
|
|
*
|
|
* Probably we could choose a number here as low as 5 to 10 seconds,
|
|
* since these circs are used for begindir, and a) generally you either
|
|
* ask another begindir question right after or you don't for a long time,
|
|
* b) clients at least through 0.2.1.x choose from the whole set of
|
|
* directory mirrors at each choice, and c) re-establishing a one-hop
|
|
* circuit via create-fast is a light operation assuming the TLS conn is
|
|
* still there.
|
|
*
|
|
* I expect "b" to go away one day when we move to using directory
|
|
* guards, but I think "a" and "c" are good enough reasons that a low
|
|
* number is safe even then.
|
|
*/
|
|
#define IDLE_ONE_HOP_CIRC_TIMEOUT 60
|
|
|
|
/** Find each non-origin circuit that has been unused for too long,
|
|
* has no streams on it, used a create_fast, and ends here: mark it
|
|
* for close.
|
|
*/
|
|
void
|
|
circuit_expire_old_circuits_serverside(time_t now)
|
|
{
|
|
circuit_t *circ;
|
|
or_circuit_t *or_circ;
|
|
time_t cutoff = now - IDLE_ONE_HOP_CIRC_TIMEOUT;
|
|
|
|
for (circ = global_circuitlist; circ; circ = circ->next) {
|
|
if (circ->marked_for_close || CIRCUIT_IS_ORIGIN(circ))
|
|
continue;
|
|
or_circ = TO_OR_CIRCUIT(circ);
|
|
/* If the circuit has been idle for too long, and there are no streams
|
|
* on it, and it ends here, and it used a create_fast, mark it for close.
|
|
*/
|
|
if (or_circ->is_first_hop && !circ->n_conn &&
|
|
!or_circ->n_streams && !or_circ->resolving_streams &&
|
|
or_circ->p_conn &&
|
|
or_circ->p_conn->timestamp_last_added_nonpadding <= cutoff) {
|
|
log_info(LD_CIRC, "Closing circ_id %d (empty %d secs ago)",
|
|
or_circ->p_circ_id,
|
|
(int)(now - or_circ->p_conn->timestamp_last_added_nonpadding));
|
|
circuit_mark_for_close(circ, END_CIRC_REASON_FINISHED);
|
|
}
|
|
}
|
|
}
|
|
|
|
/** Number of testing circuits we want open before testing our bandwidth. */
|
|
#define NUM_PARALLEL_TESTING_CIRCS 4
|
|
|
|
/** True iff we've ever had enough testing circuits open to test our
|
|
* bandwidth. */
|
|
static int have_performed_bandwidth_test = 0;
|
|
|
|
/** Reset have_performed_bandwidth_test, so we'll start building
|
|
* testing circuits again so we can exercise our bandwidth. */
|
|
void
|
|
reset_bandwidth_test(void)
|
|
{
|
|
have_performed_bandwidth_test = 0;
|
|
}
|
|
|
|
/** Return 1 if we've already exercised our bandwidth, or if we
|
|
* have fewer than NUM_PARALLEL_TESTING_CIRCS testing circuits
|
|
* established or on the way. Else return 0.
|
|
*/
|
|
int
|
|
circuit_enough_testing_circs(void)
|
|
{
|
|
circuit_t *circ;
|
|
int num = 0;
|
|
|
|
if (have_performed_bandwidth_test)
|
|
return 1;
|
|
|
|
for (circ = global_circuitlist; circ; circ = circ->next) {
|
|
if (!circ->marked_for_close && CIRCUIT_IS_ORIGIN(circ) &&
|
|
circ->purpose == CIRCUIT_PURPOSE_TESTING &&
|
|
circ->state == CIRCUIT_STATE_OPEN)
|
|
num++;
|
|
}
|
|
return num >= NUM_PARALLEL_TESTING_CIRCS;
|
|
}
|
|
|
|
/** A testing circuit has completed. Take whatever stats we want.
|
|
* Noticing reachability is taken care of in onionskin_answer(),
|
|
* so there's no need to record anything here. But if we still want
|
|
* to do the bandwidth test, and we now have enough testing circuits
|
|
* open, do it.
|
|
*/
|
|
static void
|
|
circuit_testing_opened(origin_circuit_t *circ)
|
|
{
|
|
if (have_performed_bandwidth_test ||
|
|
!check_whether_orport_reachable()) {
|
|
/* either we've already done everything we want with testing circuits,
|
|
* or this testing circuit became open due to a fluke, e.g. we picked
|
|
* a last hop where we already had the connection open due to an
|
|
* outgoing local circuit. */
|
|
circuit_mark_for_close(TO_CIRCUIT(circ), END_CIRC_AT_ORIGIN);
|
|
} else if (circuit_enough_testing_circs()) {
|
|
router_perform_bandwidth_test(NUM_PARALLEL_TESTING_CIRCS, time(NULL));
|
|
have_performed_bandwidth_test = 1;
|
|
} else
|
|
consider_testing_reachability(1, 0);
|
|
}
|
|
|
|
/** A testing circuit has failed to build. Take whatever stats we want. */
|
|
static void
|
|
circuit_testing_failed(origin_circuit_t *circ, int at_last_hop)
|
|
{
|
|
if (server_mode(get_options()) && check_whether_orport_reachable())
|
|
return;
|
|
|
|
log_info(LD_GENERAL,
|
|
"Our testing circuit (to see if your ORPort is reachable) "
|
|
"has failed. I'll try again later.");
|
|
|
|
/* These aren't used yet. */
|
|
(void)circ;
|
|
(void)at_last_hop;
|
|
}
|
|
|
|
/** 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(origin_circuit_t *circ)
|
|
{
|
|
control_event_circuit_status(circ, CIRC_EVENT_BUILT, 0);
|
|
|
|
/* Remember that this circuit has finished building. Now if we start
|
|
* it building again later (e.g. by extending it), we will know not
|
|
* to consider its build time. */
|
|
circ->has_opened = 1;
|
|
|
|
switch (TO_CIRCUIT(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:
|
|
* This won't happen in normal operation, but might happen if the
|
|
* controller did it. Just let it slide. */
|
|
}
|
|
}
|
|
|
|
/** Called whenever a circuit could not be successfully built.
|
|
*/
|
|
void
|
|
circuit_build_failed(origin_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. Also, avoid this relay for a while, and
|
|
* fail any one-hop directory fetches destined for it. */
|
|
const char *n_conn_id = circ->cpath->extend_info->identity_digest;
|
|
int already_marked = 0;
|
|
if (circ->_base.n_conn) {
|
|
or_connection_t *n_conn = circ->_base.n_conn;
|
|
if (n_conn->is_bad_for_new_circs) {
|
|
/* We only want to blame this router when a fresh healthy
|
|
* connection fails. So don't mark this router as newly failed,
|
|
* since maybe this was just an old circuit attempt that's
|
|
* finally timing out now. Also, there's no need to blow away
|
|
* circuits/streams/etc, since the failure of an unhealthy conn
|
|
* doesn't tell us much about whether a healthy conn would
|
|
* succeed. */
|
|
already_marked = 1;
|
|
}
|
|
log_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->_base.address, n_conn->_base.port);
|
|
n_conn->is_bad_for_new_circs = 1;
|
|
} else {
|
|
log_info(LD_OR,
|
|
"Our circuit died before the first hop with no connection");
|
|
}
|
|
if (n_conn_id && !already_marked) {
|
|
entry_guard_register_connect_status(n_conn_id, 0, 1, time(NULL));
|
|
/* if there are any one-hop streams waiting on this circuit, fail
|
|
* them now so they can retry elsewhere. */
|
|
connection_ap_fail_onehop(n_conn_id, circ->build_state);
|
|
}
|
|
}
|
|
|
|
switch (circ->_base.purpose) {
|
|
case CIRCUIT_PURPOSE_C_GENERAL:
|
|
/* If we never built the circuit, note it as a failure. */
|
|
circuit_increment_failure_count();
|
|
if (failed_at_last_hop) {
|
|
/* Make sure any streams that demand our last hop as their exit
|
|
* know that it's unlikely to happen. */
|
|
circuit_discard_optional_exit_enclaves(circ->cpath->prev->extend_info);
|
|
}
|
|
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->_base.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 */
|
|
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 */
|
|
log_info(LD_REND,
|
|
"Couldn't connect to Alice's chosen rend point %s "
|
|
"(%s hop failed).",
|
|
escaped(build_state_get_exit_nickname(circ->build_state)),
|
|
failed_at_last_hop?"last":"non-last");
|
|
rend_service_relaunch_rendezvous(circ);
|
|
break;
|
|
/* default:
|
|
* This won't happen in normal operation, but might happen if the
|
|
* controller did it. Just let it slide. */
|
|
}
|
|
}
|
|
|
|
/** Number of consecutive failures so far; should only be touched by
|
|
* circuit_launch_new and circuit_*_failure_count.
|
|
*/
|
|
static int n_circuit_failures = 0;
|
|
/** Before the last time we called circuit_reset_failure_count(), were
|
|
* there a lot of failures? */
|
|
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. */
|
|
origin_circuit_t *
|
|
circuit_launch(uint8_t purpose, int flags)
|
|
{
|
|
return circuit_launch_by_extend_info(purpose, NULL, flags);
|
|
}
|
|
|
|
/** Launch a new circuit with purpose <b>purpose</b> and exit node
|
|
* <b>extend_info</b> (or NULL to select a random exit node). If flags
|
|
* contains CIRCLAUNCH_NEED_UPTIME, choose among routers with high uptime. If
|
|
* CIRCLAUNCH_NEED_CAPACITY is set, choose among routers with high bandwidth.
|
|
* If CIRCLAUNCH_IS_INTERNAL is true, the last hop need not be an exit node.
|
|
* If CIRCLAUNCH_ONEHOP_TUNNEL is set, the circuit will have only one hop.
|
|
* Return the newly allocated circuit on success, or NULL on failure. */
|
|
origin_circuit_t *
|
|
circuit_launch_by_extend_info(uint8_t purpose,
|
|
extend_info_t *extend_info,
|
|
int flags)
|
|
{
|
|
origin_circuit_t *circ;
|
|
int onehop_tunnel = (flags & CIRCLAUNCH_ONEHOP_TUNNEL) != 0;
|
|
|
|
if (!onehop_tunnel && !router_have_minimum_dir_info()) {
|
|
log_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 && !onehop_tunnel) {
|
|
/* see if there are appropriate circs available to cannibalize. */
|
|
/* XXX if we're planning to add a hop, perhaps we want to look for
|
|
* internal circs rather than exit circs? -RD */
|
|
circ = circuit_find_to_cannibalize(purpose, extend_info, flags);
|
|
if (circ) {
|
|
log_info(LD_CIRC,"Cannibalizing circ '%s' for purpose %d",
|
|
build_state_get_exit_nickname(circ->build_state), purpose);
|
|
circ->_base.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. */
|
|
tor_gettimeofday(&circ->_base.timestamp_created);
|
|
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:
|
|
log_warn(LD_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, flags);
|
|
}
|
|
|
|
/** 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;
|
|
log_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 to use for <b>conn</b> and 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(edge_connection_t *conn,
|
|
uint8_t desired_circuit_purpose,
|
|
origin_circuit_t **circp)
|
|
{
|
|
origin_circuit_t *circ;
|
|
int check_exit_policy;
|
|
int need_uptime, need_internal;
|
|
int want_onehop;
|
|
or_options_t *options = get_options();
|
|
|
|
tor_assert(conn);
|
|
tor_assert(circp);
|
|
tor_assert(conn->_base.state == AP_CONN_STATE_CIRCUIT_WAIT);
|
|
check_exit_policy =
|
|
conn->socks_request->command == SOCKS_COMMAND_CONNECT &&
|
|
!conn->use_begindir &&
|
|
!connection_edge_is_rendezvous_stream(conn);
|
|
want_onehop = conn->want_onehop;
|
|
|
|
need_uptime = !conn->want_onehop && !conn->use_begindir &&
|
|
smartlist_string_num_isin(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 (!want_onehop && !router_have_minimum_dir_info()) {
|
|
if (!connection_get_by_type(CONN_TYPE_DIR)) {
|
|
int severity = LOG_NOTICE;
|
|
/* FFFF if this is a tunneled directory fetch, don't yell
|
|
* as loudly. the user doesn't even know it's happening. */
|
|
if (entry_list_is_constrained(options) &&
|
|
entries_known_but_down(options)) {
|
|
log_fn(severity, LD_APP|LD_DIR,
|
|
"Application request when we haven't used client functionality "
|
|
"lately. Optimistically trying known %s again.",
|
|
options->UseBridges ? "bridges" : "entrynodes");
|
|
entries_retry_all(options);
|
|
} else if (!options->UseBridges || any_bridge_descriptors_known()) {
|
|
log_fn(severity, LD_APP|LD_DIR,
|
|
"Application request when we haven't used client functionality "
|
|
"lately. Optimistically trying directory fetches again.");
|
|
routerlist_retry_directory_downloads(time(NULL));
|
|
}
|
|
}
|
|
/* 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 (check_exit_policy) {
|
|
if (!conn->chosen_exit_name) {
|
|
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_nodes_reject(addr,
|
|
conn->socks_request->port,
|
|
need_uptime)) {
|
|
log_notice(LD_APP,
|
|
"No Tor server allows exit to %s:%d. Rejecting.",
|
|
safe_str_client(conn->socks_request->address),
|
|
conn->socks_request->port);
|
|
return -1;
|
|
}
|
|
} else {
|
|
/* XXXX023 Duplicates checks in connection_ap_handshake_attach_circuit:
|
|
* refactor into a single function? */
|
|
const node_t *node = node_get_by_nickname(conn->chosen_exit_name, 1);
|
|
int opt = conn->chosen_exit_optional;
|
|
if (node && !connection_ap_can_use_exit(conn, node, 0)) {
|
|
log_fn(opt ? LOG_INFO : LOG_WARN, LD_APP,
|
|
"Requested exit point '%s' would refuse request. %s.",
|
|
conn->chosen_exit_name, opt ? "Trying others" : "Closing");
|
|
if (opt) {
|
|
conn->chosen_exit_optional = 0;
|
|
tor_free(conn->chosen_exit_name);
|
|
/* Try again. */
|
|
return circuit_get_open_circ_or_launch(conn,
|
|
desired_circuit_purpose,
|
|
circp);
|
|
}
|
|
return -1;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* is one already on the way? */
|
|
circ = circuit_get_best(conn, 0, desired_circuit_purpose,
|
|
need_uptime, need_internal);
|
|
if (circ)
|
|
log_debug(LD_CIRC, "one on the way!");
|
|
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 */
|
|
tor_assert(conn->rend_data);
|
|
extend_info = rend_client_get_random_intro(conn->rend_data);
|
|
if (!extend_info) {
|
|
log_info(LD_REND,
|
|
"No intro points for '%s': re-fetching service descriptor.",
|
|
safe_str_client(conn->rend_data->onion_address));
|
|
rend_client_refetch_v2_renddesc(conn->rend_data);
|
|
conn->_base.state = AP_CONN_STATE_RENDDESC_WAIT;
|
|
return 0;
|
|
}
|
|
log_info(LD_REND,"Chose '%s' as intro point for '%s'.",
|
|
extend_info->nickname,
|
|
safe_str_client(conn->rend_data->onion_address));
|
|
}
|
|
|
|
/* 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) {
|
|
const node_t *r;
|
|
int opt = conn->chosen_exit_optional;
|
|
r = node_get_by_nickname(conn->chosen_exit_name, 1);
|
|
if (r && node_has_descriptor(r)) {
|
|
extend_info = extend_info_from_node(r);
|
|
} else {
|
|
log_debug(LD_DIR, "considering %d, %s",
|
|
want_onehop, conn->chosen_exit_name);
|
|
if (want_onehop && conn->chosen_exit_name[0] == '$') {
|
|
/* We're asking for a one-hop circuit to a router that
|
|
* we don't have a routerinfo about. Make up an extend_info. */
|
|
char digest[DIGEST_LEN];
|
|
char *hexdigest = conn->chosen_exit_name+1;
|
|
tor_addr_t addr;
|
|
if (strlen(hexdigest) < HEX_DIGEST_LEN ||
|
|
base16_decode(digest,DIGEST_LEN,hexdigest,HEX_DIGEST_LEN)<0) {
|
|
log_info(LD_DIR, "Broken exit digest on tunnel conn. Closing.");
|
|
return -1;
|
|
}
|
|
if (tor_addr_from_str(&addr, conn->socks_request->address) < 0) {
|
|
log_info(LD_DIR, "Broken address %s on tunnel conn. Closing.",
|
|
escaped_safe_str_client(conn->socks_request->address));
|
|
return -1;
|
|
}
|
|
extend_info = extend_info_alloc(conn->chosen_exit_name+1,
|
|
digest, NULL, &addr,
|
|
conn->socks_request->port);
|
|
} else {
|
|
/* We will need an onion key for the router, and we
|
|
* don't have one. Refuse or relax requirements. */
|
|
log_fn(opt ? LOG_INFO : LOG_WARN, LD_APP,
|
|
"Requested exit point '%s' is not known. %s.",
|
|
conn->chosen_exit_name, opt ? "Trying others" : "Closing");
|
|
if (opt) {
|
|
conn->chosen_exit_optional = 0;
|
|
tor_free(conn->chosen_exit_name);
|
|
/* Try again with no requested exit */
|
|
return circuit_get_open_circ_or_launch(conn,
|
|
desired_circuit_purpose,
|
|
circp);
|
|
}
|
|
return -1;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
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;
|
|
|
|
{
|
|
int flags = CIRCLAUNCH_NEED_CAPACITY;
|
|
if (want_onehop) flags |= CIRCLAUNCH_ONEHOP_TUNNEL;
|
|
if (need_uptime) flags |= CIRCLAUNCH_NEED_UPTIME;
|
|
if (need_internal) flags |= CIRCLAUNCH_IS_INTERNAL;
|
|
circ = circuit_launch_by_extend_info(new_circ_purpose, extend_info,
|
|
flags);
|
|
}
|
|
|
|
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 */
|
|
circ->rend_data = rend_data_dup(conn->rend_data);
|
|
if (circ->_base.purpose == CIRCUIT_PURPOSE_C_ESTABLISH_REND &&
|
|
circ->_base.state == CIRCUIT_STATE_OPEN)
|
|
rend_client_rendcirc_has_opened(circ);
|
|
}
|
|
}
|
|
}
|
|
if (!circ)
|
|
log_info(LD_APP,
|
|
"No safe circuit (purpose %d) ready for edge "
|
|
"connection; delaying.",
|
|
desired_circuit_purpose);
|
|
*circp = circ;
|
|
return 0;
|
|
}
|
|
|
|
/** Return true iff <b>crypt_path</b> is one of the crypt_paths for
|
|
* <b>circ</b>. */
|
|
static int
|
|
cpath_is_on_circuit(origin_circuit_t *circ, crypt_path_t *crypt_path)
|
|
{
|
|
crypt_path_t *cpath, *cpath_next = NULL;
|
|
for (cpath = circ->cpath; cpath_next != circ->cpath; cpath = cpath_next) {
|
|
cpath_next = cpath->next;
|
|
if (crypt_path == cpath)
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/** Attach the AP stream <b>apconn</b> to circ's linked list of
|
|
* p_streams. Also set apconn's cpath_layer to <b>cpath</b>, or to the last
|
|
* hop in circ's cpath if <b>cpath</b> is NULL.
|
|
*/
|
|
static void
|
|
link_apconn_to_circ(edge_connection_t *apconn, origin_circuit_t *circ,
|
|
crypt_path_t *cpath)
|
|
{
|
|
/* add it into the linked list of streams on this circuit */
|
|
log_debug(LD_APP|LD_CIRC, "attaching new conn to circ. n_circ_id %d.",
|
|
circ->_base.n_circ_id);
|
|
/* reset it, so we can measure circ timeouts */
|
|
apconn->_base.timestamp_lastread = time(NULL);
|
|
apconn->next_stream = circ->p_streams;
|
|
apconn->on_circuit = TO_CIRCUIT(circ);
|
|
/* assert_connection_ok(conn, time(NULL)); */
|
|
circ->p_streams = apconn;
|
|
|
|
if (cpath) { /* we were given one; use it */
|
|
tor_assert(cpath_is_on_circuit(circ, cpath));
|
|
apconn->cpath_layer = cpath;
|
|
} else { /* use the last hop in the circuit */
|
|
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(edge_connection_t *conn, origin_circuit_t *circ)
|
|
{
|
|
int found_needle = 0;
|
|
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_have_mapping(conn->socks_request->address,
|
|
options->TrackHostExitsExpire))
|
|
return; /* nothing to track, or already mapped */
|
|
|
|
SMARTLIST_FOREACH(options->TrackHostExits, const char *, cp, {
|
|
if (cp[0] == '.') { /* match end */
|
|
if (cp[1] == '\0' ||
|
|
!strcasecmpend(conn->socks_request->address, cp) ||
|
|
!strcasecmp(conn->socks_request->address, &cp[1]))
|
|
found_needle = 1;
|
|
} else if (strcasecmp(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 named. */
|
|
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,
|
|
ADDRMAPSRC_TRACKEXIT);
|
|
}
|
|
|
|
/** 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. The stream will exit from the hop
|
|
* indicated by <b>cpath</b>, or from the last hop in circ's cpath if
|
|
* <b>cpath</b> is NULL. */
|
|
int
|
|
connection_ap_handshake_attach_chosen_circuit(edge_connection_t *conn,
|
|
origin_circuit_t *circ,
|
|
crypt_path_t *cpath)
|
|
{
|
|
tor_assert(conn);
|
|
tor_assert(conn->_base.state == AP_CONN_STATE_CIRCUIT_WAIT ||
|
|
conn->_base.state == AP_CONN_STATE_CONTROLLER_WAIT);
|
|
tor_assert(conn->socks_request);
|
|
tor_assert(circ);
|
|
tor_assert(circ->_base.state == CIRCUIT_STATE_OPEN);
|
|
|
|
conn->_base.state = AP_CONN_STATE_CIRCUIT_WAIT;
|
|
|
|
if (!circ->_base.timestamp_dirty)
|
|
circ->_base.timestamp_dirty = time(NULL);
|
|
|
|
link_apconn_to_circ(conn, circ, cpath);
|
|
tor_assert(conn->socks_request);
|
|
if (conn->socks_request->command == SOCKS_COMMAND_CONNECT) {
|
|
if (!conn->use_begindir)
|
|
consider_recording_trackhost(conn, circ);
|
|
if (connection_ap_handshake_send_begin(conn) < 0)
|
|
return -1;
|
|
} else {
|
|
if (connection_ap_handshake_send_resolve(conn) < 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, and is maybe already marked);
|
|
* 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.
|
|
*/
|
|
/* XXXX this function should mark for close whenever it returns -1;
|
|
* its callers shouldn't have to worry about that. */
|
|
int
|
|
connection_ap_handshake_attach_circuit(edge_connection_t *conn)
|
|
{
|
|
int retval;
|
|
int conn_age;
|
|
int want_onehop;
|
|
|
|
tor_assert(conn);
|
|
tor_assert(conn->_base.state == AP_CONN_STATE_CIRCUIT_WAIT);
|
|
tor_assert(conn->socks_request);
|
|
want_onehop = conn->want_onehop;
|
|
|
|
conn_age = (int)(time(NULL) - conn->_base.timestamp_created);
|
|
|
|
if (conn_age >= get_options()->SocksTimeout) {
|
|
int severity = (tor_addr_is_null(&conn->_base.addr) && !conn->_base.port) ?
|
|
LOG_INFO : LOG_NOTICE;
|
|
log_fn(severity, LD_APP,
|
|
"Tried for %d seconds to get a connection to %s:%d. Giving up.",
|
|
conn_age, safe_str_client(conn->socks_request->address),
|
|
conn->socks_request->port);
|
|
return -1;
|
|
}
|
|
|
|
if (!connection_edge_is_rendezvous_stream(conn)) { /* we're a general conn */
|
|
origin_circuit_t *circ=NULL;
|
|
|
|
if (conn->chosen_exit_name) {
|
|
const node_t *node = node_get_by_nickname(conn->chosen_exit_name, 1);
|
|
int opt = conn->chosen_exit_optional;
|
|
if (!node && !want_onehop) {
|
|
/* We ran into this warning when trying to extend a circuit to a
|
|
* hidden service directory for which we didn't have a router
|
|
* descriptor. See flyspray task 767 for more details. We should
|
|
* keep this in mind when deciding to use BEGIN_DIR cells for other
|
|
* directory requests as well. -KL*/
|
|
log_fn(opt ? LOG_INFO : LOG_WARN, LD_APP,
|
|
"Requested exit point '%s' is not known. %s.",
|
|
conn->chosen_exit_name, opt ? "Trying others" : "Closing");
|
|
if (opt) {
|
|
conn->chosen_exit_optional = 0;
|
|
tor_free(conn->chosen_exit_name);
|
|
return 0;
|
|
}
|
|
return -1;
|
|
}
|
|
if (node && !connection_ap_can_use_exit(conn, node, 0)) {
|
|
log_fn(opt ? LOG_INFO : LOG_WARN, LD_APP,
|
|
"Requested exit point '%s' would refuse request. %s.",
|
|
conn->chosen_exit_name, opt ? "Trying others" : "Closing");
|
|
if (opt) {
|
|
conn->chosen_exit_optional = 0;
|
|
tor_free(conn->chosen_exit_name);
|
|
return 0;
|
|
}
|
|
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) // XXX022 if we totally fail, this still returns 0 -RD
|
|
return retval;
|
|
|
|
log_debug(LD_APP|LD_CIRC,
|
|
"Attaching apconn to circ %d (stream %d sec old).",
|
|
circ->_base.n_circ_id, conn_age);
|
|
/* 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, NULL);
|
|
|
|
} else { /* we're a rendezvous conn */
|
|
origin_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 */
|
|
log_info(LD_REND,
|
|
"rend joined circ %d already here. attaching. "
|
|
"(stream %d sec old)",
|
|
rendcirc->_base.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 tradeoff between linkability and
|
|
* feasibility, at this point.
|
|
*/
|
|
rendcirc->_base.timestamp_dirty = time(NULL);
|
|
link_apconn_to_circ(conn, rendcirc, NULL);
|
|
if (connection_ap_handshake_send_begin(conn) < 0)
|
|
return 0; /* already marked, let them fade away */
|
|
return 1;
|
|
}
|
|
|
|
if (rendcirc && (rendcirc->_base.purpose ==
|
|
CIRCUIT_PURPOSE_C_REND_READY_INTRO_ACKED)) {
|
|
log_info(LD_REND,
|
|
"pending-join circ %d already here, with intro ack. "
|
|
"Stalling. (stream %d sec old)",
|
|
rendcirc->_base.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. */
|
|
circuit_t *c = NULL;
|
|
tor_assert(introcirc);
|
|
log_info(LD_REND, "Intro circ %d present and awaiting ack (rend %d). "
|
|
"Stalling. (stream %d sec old)",
|
|
introcirc->_base.n_circ_id,
|
|
rendcirc ? rendcirc->_base.n_circ_id : 0,
|
|
conn_age);
|
|
/* abort parallel intro circs, if any */
|
|
for (c = global_circuitlist; c; c = c->next) {
|
|
if (c->purpose == CIRCUIT_PURPOSE_C_INTRODUCING &&
|
|
!c->marked_for_close && CIRCUIT_IS_ORIGIN(c)) {
|
|
origin_circuit_t *oc = TO_ORIGIN_CIRCUIT(c);
|
|
if (oc->rend_data &&
|
|
!rend_cmp_service_ids(conn->rend_data->onion_address,
|
|
oc->rend_data->onion_address)) {
|
|
log_info(LD_REND|LD_CIRC, "Closing introduction circuit that we "
|
|
"built in parallel.");
|
|
circuit_mark_for_close(c, END_CIRC_REASON_TIMEOUT);
|
|
}
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* now rendcirc and introcirc are each either undefined or not finished */
|
|
|
|
if (rendcirc && introcirc &&
|
|
rendcirc->_base.purpose == CIRCUIT_PURPOSE_C_REND_READY) {
|
|
log_info(LD_REND,
|
|
"ready rend circ %d already here (no intro-ack yet on "
|
|
"intro %d). (stream %d sec old)",
|
|
rendcirc->_base.n_circ_id,
|
|
introcirc->_base.n_circ_id, conn_age);
|
|
|
|
tor_assert(introcirc->_base.purpose == CIRCUIT_PURPOSE_C_INTRODUCING);
|
|
if (introcirc->_base.state == CIRCUIT_STATE_OPEN) {
|
|
log_info(LD_REND,"found open intro circ %d (rend %d); sending "
|
|
"introduction. (stream %d sec old)",
|
|
introcirc->_base.n_circ_id, rendcirc->_base.n_circ_id,
|
|
conn_age);
|
|
if (rend_client_send_introduction(introcirc, rendcirc) < 0) {
|
|
return -1;
|
|
}
|
|
rendcirc->_base.timestamp_dirty = time(NULL);
|
|
introcirc->_base.timestamp_dirty = time(NULL);
|
|
assert_circuit_ok(TO_CIRCUIT(rendcirc));
|
|
assert_circuit_ok(TO_CIRCUIT(introcirc));
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
log_info(LD_REND, "Intro (%d) and rend (%d) circs are not both ready. "
|
|
"Stalling conn. (%d sec old)",
|
|
introcirc ? introcirc->_base.n_circ_id : 0,
|
|
rendcirc ? rendcirc->_base.n_circ_id : 0, conn_age);
|
|
return 0;
|
|
}
|
|
}
|
|
|