Tor  0.4.7.0-alpha-dev
circuituse.c
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1 /* Copyright (c) 2001 Matej Pfajfar.
2  * Copyright (c) 2001-2004, Roger Dingledine.
3  * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
4  * Copyright (c) 2007-2021, The Tor Project, Inc. */
5 /* See LICENSE for licensing information */
6 
7 /**
8  * \file circuituse.c
9  * \brief Launch the right sort of circuits and attach the right streams to
10  * them.
11  *
12  * As distinct from circuitlist.c, which manages lookups to find circuits, and
13  * circuitbuild.c, which handles the logistics of circuit construction, this
14  * module keeps track of which streams can be attached to which circuits (in
15  * circuit_get_best()), and attaches streams to circuits (with
16  * circuit_try_attaching_streams(), connection_ap_handshake_attach_circuit(),
17  * and connection_ap_handshake_attach_chosen_circuit() ).
18  *
19  * This module also makes sure that we are building circuits for all of the
20  * predicted ports, using circuit_remove_handled_ports(),
21  * circuit_stream_is_being_handled(), and circuit_build_needed_cirs(). It
22  * handles launching circuits for specific targets using
23  * circuit_launch_by_extend_info().
24  *
25  * This is also where we handle expiring circuits that have been around for
26  * too long without actually completing, along with the circuit_build_timeout
27  * logic in circuitstats.c.
28  **/
29 
30 #include "core/or/or.h"
31 #include "app/config/config.h"
33 #include "core/or/channel.h"
34 #include "core/or/circuitbuild.h"
35 #include "core/or/circuitlist.h"
36 #include "core/or/circuitstats.h"
37 #include "core/or/circuituse.h"
38 #include "core/or/circuitpadding.h"
40 #include "core/or/extendinfo.h"
41 #include "core/or/policies.h"
42 #include "core/or/trace_probes_circuit.h"
44 #include "feature/client/bridges.h"
45 #include "feature/client/circpathbias.h"
50 #include "feature/hs/hs_circuit.h"
51 #include "feature/hs/hs_client.h"
52 #include "feature/hs/hs_common.h"
53 #include "feature/hs/hs_ident.h"
54 #include "feature/hs/hs_stats.h"
60 #include "feature/relay/selftest.h"
62 #include "lib/math/fp.h"
63 #include "lib/time/tvdiff.h"
64 #include "lib/trace/events.h"
65 
69 #include "core/or/extend_info_st.h"
70 #include "core/or/or_circuit_st.h"
73 
75 static void circuit_increment_failure_count(void);
76 
77 /** Check whether the hidden service destination of the stream at
78  * <b>edge_conn</b> is the same as the destination of the circuit at
79  * <b>origin_circ</b>. */
80 static int
82  const origin_circuit_t *origin_circ)
83 {
84  /* Check if this is a v3 rendezvous circ/stream */
85  if ((edge_conn->hs_ident && !origin_circ->hs_ident) ||
86  (!edge_conn->hs_ident && origin_circ->hs_ident) ||
87  (edge_conn->hs_ident && origin_circ->hs_ident &&
88  !ed25519_pubkey_eq(&edge_conn->hs_ident->identity_pk,
89  &origin_circ->hs_ident->identity_pk))) {
90  /* this circ is not for this conn */
91  return 0;
92  }
93 
94  return 1;
95 }
96 
97 /** Return 1 if <b>circ</b> could be returned by circuit_get_best().
98  * Else return 0.
99  */
100 static int
102  const entry_connection_t *conn,
103  int must_be_open, uint8_t purpose,
104  int need_uptime, int need_internal,
105  time_t now)
106 {
107  const circuit_t *circ = TO_CIRCUIT(origin_circ);
108  const node_t *exitnode;
109  cpath_build_state_t *build_state;
110  tor_assert(circ);
111  tor_assert(conn);
112  tor_assert(conn->socks_request);
113 
114  if (must_be_open && (circ->state != CIRCUIT_STATE_OPEN || !circ->n_chan))
115  return 0; /* ignore non-open circs */
116  if (circ->marked_for_close)
117  return 0;
118 
119  /* if this circ isn't our purpose, skip. */
120  if (purpose == CIRCUIT_PURPOSE_C_REND_JOINED && !must_be_open) {
125  return 0;
126  } else if (purpose == CIRCUIT_PURPOSE_C_INTRODUCE_ACK_WAIT &&
127  !must_be_open) {
128  if (circ->purpose != CIRCUIT_PURPOSE_C_INTRODUCING &&
130  return 0;
131  } else {
132  if (purpose != circ->purpose)
133  return 0;
134  }
135 
136  /* If this is a timed-out hidden service circuit, skip it. */
137  if (origin_circ->hs_circ_has_timed_out) {
138  return 0;
139  }
140 
141  if (purpose == CIRCUIT_PURPOSE_C_GENERAL ||
142  purpose == CIRCUIT_PURPOSE_C_HSDIR_GET ||
143  purpose == CIRCUIT_PURPOSE_S_HSDIR_POST ||
144  purpose == CIRCUIT_PURPOSE_HS_VANGUARDS ||
145  purpose == CIRCUIT_PURPOSE_C_REND_JOINED) {
146  if (circ->timestamp_dirty &&
147  circ->timestamp_dirty+get_options()->MaxCircuitDirtiness <= now)
148  return 0;
149  }
150 
151  if (origin_circ->unusable_for_new_conns)
152  return 0;
153 
154  /* decide if this circ is suitable for this conn */
155 
156  /* for rend circs, circ->cpath->prev is not the last router in the
157  * circuit, it's the magical extra service hop. so just check the nickname
158  * of the one we meant to finish at.
159  */
160  build_state = origin_circ->build_state;
161  exitnode = build_state_get_exit_node(build_state);
162 
163  if (need_uptime && !build_state->need_uptime)
164  return 0;
165  if (need_internal != build_state->is_internal)
166  return 0;
167 
168  if (purpose == CIRCUIT_PURPOSE_C_GENERAL ||
169  purpose == CIRCUIT_PURPOSE_S_HSDIR_POST ||
170  purpose == CIRCUIT_PURPOSE_C_HSDIR_GET) {
171  tor_addr_t addr;
172  if (!exitnode && !build_state->onehop_tunnel) {
173  log_debug(LD_CIRC,"Not considering circuit with unknown router.");
174  return 0; /* this circuit is screwed and doesn't know it yet,
175  * or is a rendezvous circuit. */
176  }
177  if (build_state->onehop_tunnel) {
178  if (!conn->want_onehop) {
179  log_debug(LD_CIRC,"Skipping one-hop circuit.");
180  return 0;
181  }
183  if (build_state->chosen_exit) {
184  char digest[DIGEST_LEN];
185  if (hexdigest_to_digest(conn->chosen_exit_name, digest) < 0)
186  return 0; /* broken digest, we don't want it */
187  if (tor_memneq(digest, build_state->chosen_exit->identity_digest,
188  DIGEST_LEN))
189  return 0; /* this is a circuit to somewhere else */
190  if (tor_digest_is_zero(digest)) {
191  /* we don't know the digest; have to compare addr:port */
192  const int family = tor_addr_parse(&addr,
193  conn->socks_request->address);
194  if (family < 0 ||
195  !extend_info_has_orport(build_state->chosen_exit, &addr,
196  conn->socks_request->port))
197  return 0;
198  }
199  }
200  } else {
201  if (conn->want_onehop) {
202  /* don't use three-hop circuits -- that could hurt our anonymity. */
203  return 0;
204  }
205  }
206  if (origin_circ->prepend_policy) {
207  if (tor_addr_parse(&addr, conn->socks_request->address) != -1) {
208  int r = compare_tor_addr_to_addr_policy(&addr,
209  conn->socks_request->port,
210  origin_circ->prepend_policy);
211  if (r == ADDR_POLICY_REJECTED)
212  return 0;
213  }
214  }
215  if (exitnode && !connection_ap_can_use_exit(conn, exitnode)) {
216  /* can't exit from this router */
217  return 0;
218  }
219  } else { /* not general: this might be a rend circuit */
220  const edge_connection_t *edge_conn = ENTRY_TO_EDGE_CONN(conn);
221  if (!circuit_matches_with_rend_stream(edge_conn, origin_circ)) {
222  return 0;
223  }
224  }
225 
226  if (!connection_edge_compatible_with_circuit(conn, origin_circ)) {
227  /* conn needs to be isolated from other conns that have already used
228  * origin_circ */
229  return 0;
230  }
231 
232  return 1;
233 }
234 
235 /** Return 1 if circuit <b>a</b> is better than circuit <b>b</b> for
236  * <b>conn</b>, and return 0 otherwise. Used by circuit_get_best.
237  */
238 static int
240  const entry_connection_t *conn)
241 {
242  const circuit_t *a = TO_CIRCUIT(oa);
243  const circuit_t *b = TO_CIRCUIT(ob);
244  const uint8_t purpose = ENTRY_TO_CONN(conn)->purpose;
245  int a_bits, b_bits;
246 
247  /* If one of the circuits was allowed to live due to relaxing its timeout,
248  * it is definitely worse (it's probably a much slower path). */
249  if (oa->relaxed_timeout && !ob->relaxed_timeout)
250  return 0; /* ob is better. It's not relaxed. */
251  if (!oa->relaxed_timeout && ob->relaxed_timeout)
252  return 1; /* oa is better. It's not relaxed. */
253 
254  switch (purpose) {
258  /* if it's used but less dirty it's best;
259  * else if it's more recently created it's best
260  */
261  if (b->timestamp_dirty) {
262  if (a->timestamp_dirty &&
264  return 1;
265  } else {
266  if (a->timestamp_dirty ||
267  timercmp(&a->timestamp_began, &b->timestamp_began, OP_GT))
268  return 1;
269  if (ob->build_state->is_internal)
270  /* XXXX++ what the heck is this internal thing doing here. I
271  * think we can get rid of it. circuit_is_acceptable() already
272  * makes sure that is_internal is exactly what we need it to
273  * be. -RD */
274  return 1;
275  }
276  break;
278  /* the closer it is to ack_wait the better it is */
279  if (a->purpose > b->purpose)
280  return 1;
281  break;
283  /* the closer it is to rend_joined the better it is */
284  if (a->purpose > b->purpose)
285  return 1;
286  break;
287  }
288 
289  /* XXXX Maybe this check should get a higher priority to avoid
290  * using up circuits too rapidly. */
291 
293  (origin_circuit_t*)oa, 1);
295  (origin_circuit_t*)ob, 1);
296  /* if x_bits < 0, then we have not used x for anything; better not to dirty
297  * a connection if we can help it. */
298  if (a_bits < 0) {
299  return 0;
300  } else if (b_bits < 0) {
301  return 1;
302  }
303  a_bits &= ~ oa->isolation_flags_mixed;
304  a_bits &= ~ ob->isolation_flags_mixed;
305  if (n_bits_set_u8(a_bits) < n_bits_set_u8(b_bits)) {
306  /* The fewer new restrictions we need to make on a circuit for stream
307  * isolation, the better. */
308  return 1;
309  }
310 
311  return 0;
312 }
313 
314 /** Find the best circ that conn can use, preferably one which is
315  * dirty. Circ must not be too old.
316  *
317  * Conn must be defined.
318  *
319  * If must_be_open, ignore circs not in CIRCUIT_STATE_OPEN.
320  *
321  * circ_purpose specifies what sort of circuit we must have.
322  * It can be C_GENERAL, C_INTRODUCE_ACK_WAIT, or C_REND_JOINED.
323  *
324  * If it's REND_JOINED and must_be_open==0, then return the closest
325  * rendezvous-purposed circuit that you can find.
326  *
327  * If it's INTRODUCE_ACK_WAIT and must_be_open==0, then return the
328  * closest introduce-purposed circuit that you can find.
329  */
330 static origin_circuit_t *
332  int must_be_open, uint8_t purpose,
333  int need_uptime, int need_internal)
334 {
335  origin_circuit_t *best=NULL;
336  struct timeval now;
337  int intro_going_on_but_too_old = 0;
338 
339  tor_assert(conn);
340 
342  purpose == CIRCUIT_PURPOSE_HS_VANGUARDS ||
343  purpose == CIRCUIT_PURPOSE_C_HSDIR_GET ||
344  purpose == CIRCUIT_PURPOSE_S_HSDIR_POST ||
346  purpose == CIRCUIT_PURPOSE_C_REND_JOINED);
347 
348  tor_gettimeofday(&now);
349 
351  origin_circuit_t *origin_circ;
352  if (!CIRCUIT_IS_ORIGIN(circ))
353  continue;
354  origin_circ = TO_ORIGIN_CIRCUIT(circ);
355 
356  /* Log an info message if we're going to launch a new intro circ in
357  * parallel */
358  if (purpose == CIRCUIT_PURPOSE_C_INTRODUCE_ACK_WAIT &&
359  !must_be_open && origin_circ->hs_circ_has_timed_out &&
360  !circ->marked_for_close) {
361  intro_going_on_but_too_old = 1;
362  continue;
363  }
364 
365  if (!circuit_is_acceptable(origin_circ,conn,must_be_open,purpose,
366  need_uptime,need_internal, (time_t)now.tv_sec))
367  continue;
368 
369  /* now this is an acceptable circ to hand back. but that doesn't
370  * mean it's the *best* circ to hand back. try to decide.
371  */
372  if (!best || circuit_is_better(origin_circ,best,conn))
373  best = origin_circ;
374  }
375  SMARTLIST_FOREACH_END(circ);
376 
377  if (!best && intro_going_on_but_too_old)
378  log_info(LD_REND|LD_CIRC, "There is an intro circuit being created "
379  "right now, but it has already taken quite a while. Starting "
380  "one in parallel.");
381 
382  return best;
383 }
384 
385 /** Return the number of not-yet-open general-purpose origin circuits. */
386 static int
388 {
389  int count = 0;
390 
392  if (circ->marked_for_close ||
393  circ->state == CIRCUIT_STATE_OPEN ||
395  !CIRCUIT_IS_ORIGIN(circ))
396  continue;
397 
398  ++count;
399  }
400  SMARTLIST_FOREACH_END(circ);
401 
402  return count;
403 }
404 
405 #if 0
406 /** Check whether, according to the policies in <b>options</b>, the
407  * circuit <b>circ</b> makes sense. */
408 /* XXXX currently only checks Exclude{Exit}Nodes; it should check more.
409  * Also, it doesn't have the right definition of an exit circuit. Also,
410  * it's never called. */
411 int
412 circuit_conforms_to_options(const origin_circuit_t *circ,
413  const or_options_t *options)
414 {
415  const crypt_path_t *cpath, *cpath_next = NULL;
416 
417  /* first check if it includes any excluded nodes */
418  for (cpath = circ->cpath; cpath_next != circ->cpath; cpath = cpath_next) {
419  cpath_next = cpath->next;
421  cpath->extend_info))
422  return 0;
423  }
424 
425  /* then consider the final hop */
427  circ->cpath->prev->extend_info))
428  return 0;
429 
430  return 1;
431 }
432 #endif /* 0 */
433 
434 /**
435  * Close all circuits that start at us, aren't open, and were born
436  * at least CircuitBuildTimeout seconds ago.
437  *
438  * TODO: This function is now partially redundant to
439  * circuit_build_times_handle_completed_hop(), but that function only
440  * covers circuits up to and including 3 hops that are still actually
441  * completing hops. However, circuit_expire_building() also handles longer
442  * circuits, as well as circuits that are completely stalled.
443  * In the future (after prop247/other path selection revamping), we probably
444  * want to eliminate this rats nest in favor of a simpler approach.
445  */
446 void
448 {
449  /* circ_times.timeout_ms and circ_times.close_ms are from
450  * circuit_build_times_get_initial_timeout() if we haven't computed
451  * custom timeouts yet */
452  struct timeval general_cutoff, begindir_cutoff, fourhop_cutoff,
453  close_cutoff, extremely_old_cutoff, hs_extremely_old_cutoff,
454  cannibalized_cutoff, c_intro_cutoff, s_intro_cutoff, stream_cutoff;
455  const or_options_t *options = get_options();
456  struct timeval now;
457  cpath_build_state_t *build_state;
458  int any_opened_circs = 0;
459 
460  tor_gettimeofday(&now);
461 
462  /* Check to see if we have any opened circuits. If we don't,
463  * we want to be more lenient with timeouts, in case the
464  * user has relocated and/or changed network connections.
465  * See bug #3443. */
466  any_opened_circs = circuit_any_opened_circuits();
467 
468 #define SET_CUTOFF(target, msec) do { \
469  long ms = tor_lround(msec); \
470  struct timeval diff; \
471  diff.tv_sec = ms / 1000; \
472  diff.tv_usec = (int)((ms % 1000) * 1000); \
473  timersub(&now, &diff, &target); \
474  } while (0)
475 
476  /**
477  * Because circuit build timeout is calculated only based on 3 hop
478  * general purpose circuit construction, we need to scale the timeout
479  * to make it properly apply to longer circuits, and circuits of
480  * certain usage types. The following diagram illustrates how we
481  * derive the scaling below. In short, we calculate the number
482  * of times our telescoping-based circuit construction causes cells
483  * to traverse each link for the circuit purpose types in question,
484  * and then assume each link is equivalent.
485  *
486  * OP --a--> A --b--> B --c--> C
487  * OP --a--> A --b--> B --c--> C --d--> D
488  *
489  * Let h = a = b = c = d
490  *
491  * Three hops (general_cutoff)
492  * RTTs = 3a + 2b + c
493  * RTTs = 6h
494  * Cannibalized:
495  * RTTs = a+b+c+d
496  * RTTs = 4h
497  * Four hops:
498  * RTTs = 4a + 3b + 2c + d
499  * RTTs = 10h
500  * Client INTRODUCE1+ACK: // XXX: correct?
501  * RTTs = 5a + 4b + 3c + 2d
502  * RTTs = 14h
503  * Server intro:
504  * RTTs = 4a + 3b + 2c
505  * RTTs = 9h
506  */
507  SET_CUTOFF(general_cutoff, get_circuit_build_timeout_ms());
508  SET_CUTOFF(begindir_cutoff, get_circuit_build_timeout_ms());
509 
510  // TODO: We should probably use route_len_for_purpose() here instead,
511  // except that does not count the extra round trip for things like server
512  // intros and rends.
513 
514  /* > 3hop circs seem to have a 1.0 second delay on their cannibalized
515  * 4th hop. */
516  SET_CUTOFF(fourhop_cutoff, get_circuit_build_timeout_ms() * (10/6.0) + 1000);
517 
518  /* CIRCUIT_PURPOSE_C_ESTABLISH_REND behaves more like a RELAY cell.
519  * Use the stream cutoff (more or less). */
520  SET_CUTOFF(stream_cutoff, MAX(options->CircuitStreamTimeout,15)*1000 + 1000);
521 
522  /* Be lenient with cannibalized circs. They already survived the official
523  * CBT, and they're usually not performance-critical. */
524  SET_CUTOFF(cannibalized_cutoff,
526  options->CircuitStreamTimeout * 1000) + 1000);
527 
528  /* Intro circs have an extra round trip (and are also 4 hops long) */
529  SET_CUTOFF(c_intro_cutoff, get_circuit_build_timeout_ms() * (14/6.0) + 1000);
530 
531  /* Server intro circs have an extra round trip */
532  SET_CUTOFF(s_intro_cutoff, get_circuit_build_timeout_ms() * (9/6.0) + 1000);
533 
534  SET_CUTOFF(close_cutoff, get_circuit_build_close_time_ms());
535  SET_CUTOFF(extremely_old_cutoff, get_circuit_build_close_time_ms()*2 + 1000);
536 
537  SET_CUTOFF(hs_extremely_old_cutoff,
539  options->SocksTimeout * 1000));
540 
541  bool fixed_time = circuit_build_times_disabled(get_options());
542 
544  struct timeval cutoff;
545 
546  if (!CIRCUIT_IS_ORIGIN(victim) || /* didn't originate here */
547  victim->marked_for_close) /* don't mess with marked circs */
548  continue;
549 
550  /* If we haven't yet started the first hop, it means we don't have
551  * any orconns available, and thus have not started counting time yet
552  * for this circuit. See circuit_deliver_create_cell() and uses of
553  * timestamp_began.
554  *
555  * Continue to wait in this case. The ORConn should timeout
556  * independently and kill us then.
557  */
558  if (TO_ORIGIN_CIRCUIT(victim)->cpath->state == CPATH_STATE_CLOSED) {
559  continue;
560  }
561 
562  build_state = TO_ORIGIN_CIRCUIT(victim)->build_state;
563  if (build_state && build_state->onehop_tunnel)
564  cutoff = begindir_cutoff;
565  else if (victim->purpose == CIRCUIT_PURPOSE_C_MEASURE_TIMEOUT)
566  cutoff = close_cutoff;
567  else if (victim->purpose == CIRCUIT_PURPOSE_C_INTRODUCE_ACK_WAIT)
568  cutoff = c_intro_cutoff;
569  else if (victim->purpose == CIRCUIT_PURPOSE_S_ESTABLISH_INTRO)
570  cutoff = s_intro_cutoff;
571  else if (victim->purpose == CIRCUIT_PURPOSE_C_ESTABLISH_REND)
572  cutoff = stream_cutoff;
573  else if (victim->purpose == CIRCUIT_PURPOSE_PATH_BIAS_TESTING)
574  cutoff = close_cutoff;
575  else if (TO_ORIGIN_CIRCUIT(victim)->has_opened &&
576  victim->state != CIRCUIT_STATE_OPEN)
577  cutoff = cannibalized_cutoff;
578  else if (build_state && build_state->desired_path_len >= 4)
579  cutoff = fourhop_cutoff;
580  else
581  cutoff = general_cutoff;
582 
583  if (TO_ORIGIN_CIRCUIT(victim)->hs_circ_has_timed_out)
584  cutoff = hs_extremely_old_cutoff;
585 
586  if (timercmp(&victim->timestamp_began, &cutoff, OP_GT))
587  continue; /* it's still young, leave it alone */
588 
589  /* We need to double-check the opened state here because
590  * we don't want to consider opened 1-hop dircon circuits for
591  * deciding when to relax the timeout, but we *do* want to relax
592  * those circuits too if nothing else is opened *and* they still
593  * aren't either. */
594  if (!any_opened_circs && victim->state != CIRCUIT_STATE_OPEN) {
595  /* It's still young enough that we wouldn't close it, right? */
596  if (timercmp(&victim->timestamp_began, &close_cutoff, OP_GT)) {
597  if (!TO_ORIGIN_CIRCUIT(victim)->relaxed_timeout) {
598  int first_hop_succeeded = TO_ORIGIN_CIRCUIT(victim)->cpath->state
599  == CPATH_STATE_OPEN;
600  if (!fixed_time) {
601  log_info(LD_CIRC,
602  "No circuits are opened. Relaxing timeout for circuit %d "
603  "(a %s %d-hop circuit in state %s with channel state %s).",
604  TO_ORIGIN_CIRCUIT(victim)->global_identifier,
605  circuit_purpose_to_string(victim->purpose),
606  TO_ORIGIN_CIRCUIT(victim)->build_state ?
607  TO_ORIGIN_CIRCUIT(victim)->build_state->desired_path_len :
608  -1,
609  circuit_state_to_string(victim->state),
610  victim->n_chan ?
611  channel_state_to_string(victim->n_chan->state) : "none");
612  }
613 
614  /* We count the timeout here for CBT, because technically this
615  * was a timeout, and the timeout value needs to reset if we
616  * see enough of them. Note this means we also need to avoid
617  * double-counting below, too. */
619  first_hop_succeeded);
620  TO_ORIGIN_CIRCUIT(victim)->relaxed_timeout = 1;
621  }
622  continue;
623  } else {
624  static ratelim_t relax_timeout_limit = RATELIM_INIT(3600);
625  const double build_close_ms = get_circuit_build_close_time_ms();
626  if (!fixed_time) {
627  log_fn_ratelim(&relax_timeout_limit, LOG_NOTICE, LD_CIRC,
628  "No circuits are opened. Relaxed timeout for circuit %d "
629  "(a %s %d-hop circuit in state %s with channel state %s) to "
630  "%ldms. However, it appears the circuit has timed out "
631  "anyway.",
632  TO_ORIGIN_CIRCUIT(victim)->global_identifier,
633  circuit_purpose_to_string(victim->purpose),
634  TO_ORIGIN_CIRCUIT(victim)->build_state ?
635  TO_ORIGIN_CIRCUIT(victim)->build_state->desired_path_len :
636  -1,
637  circuit_state_to_string(victim->state),
638  victim->n_chan ?
639  channel_state_to_string(victim->n_chan->state) : "none",
640  (long)build_close_ms);
641  }
642  }
643  }
644 
645 #if 0
646  /* some debug logs, to help track bugs */
647  if (victim->purpose >= CIRCUIT_PURPOSE_C_INTRODUCING &&
648  victim->purpose <= CIRCUIT_PURPOSE_C_REND_READY_INTRO_ACKED) {
649  if (!victim->timestamp_dirty)
650  log_fn(LOG_DEBUG,"Considering %sopen purpose %d to %s (circid %d)."
651  "(clean).",
652  victim->state == CIRCUIT_STATE_OPEN ? "" : "non",
653  victim->purpose, victim->build_state->chosen_exit_name,
654  victim->n_circ_id);
655  else
656  log_fn(LOG_DEBUG,"Considering %sopen purpose %d to %s (circid %d). "
657  "%d secs since dirty.",
658  victim->state == CIRCUIT_STATE_OPEN ? "" : "non",
659  victim->purpose, victim->build_state->chosen_exit_name,
660  victim->n_circ_id,
661  (int)(now - victim->timestamp_dirty));
662  }
663 #endif /* 0 */
664 
665  /* if circ is !open, or if it's open but purpose is a non-finished
666  * intro or rend, then mark it for close */
667  if (victim->state == CIRCUIT_STATE_OPEN) {
668  switch (victim->purpose) {
669  default: /* most open circuits can be left alone. */
670  continue; /* yes, continue inside a switch refers to the nearest
671  * enclosing loop. C is smart. */
673  break; /* too old, need to die */
675  /* it's a rend_ready circ -- has it already picked a query? */
676  /* c_rend_ready circs measure age since timestamp_dirty,
677  * because that's set when they switch purposes
678  */
679  if (TO_ORIGIN_CIRCUIT(victim)->hs_ident ||
680  victim->timestamp_dirty > cutoff.tv_sec)
681  continue;
682  break;
684  /* Open path bias testing circuits are given a long
685  * time to complete the test, but not forever */
687  break;
689  /* That purpose means that the intro point circuit has been opened
690  * successfully but the INTRODUCE1 cell hasn't been sent yet because
691  * the client is waiting for the rendezvous point circuit to open.
692  * Keep this circuit open while waiting for the rendezvous circuit.
693  * We let the circuit idle timeout take care of cleaning this
694  * circuit if it never used. */
695  continue;
699  /* rend and intro circs become dirty each time they
700  * make an introduction attempt. so timestamp_dirty
701  * will reflect the time since the last attempt.
702  */
703  if (victim->timestamp_dirty > cutoff.tv_sec)
704  continue;
705  break;
706  }
707  } else { /* circuit not open, consider recording failure as timeout */
708  int first_hop_succeeded = TO_ORIGIN_CIRCUIT(victim)->cpath &&
709  TO_ORIGIN_CIRCUIT(victim)->cpath->state == CPATH_STATE_OPEN;
710 
711  if (TO_ORIGIN_CIRCUIT(victim)->p_streams != NULL) {
712  log_warn(LD_BUG, "Circuit %d (purpose %d, %s) has timed out, "
713  "yet has attached streams!",
714  TO_ORIGIN_CIRCUIT(victim)->global_identifier,
715  victim->purpose,
716  circuit_purpose_to_string(victim->purpose));
718  continue;
719  }
720 
723 
724  log_info(LD_CIRC,
725  "Deciding to count the timeout for circuit %"PRIu32,
726  TO_ORIGIN_CIRCUIT(victim)->global_identifier);
727 
728  /* Circuits are allowed to last longer for measurement.
729  * Switch their purpose and wait. */
730  if (victim->purpose != CIRCUIT_PURPOSE_C_MEASURE_TIMEOUT) {
732  victim));
733  continue;
734  }
735 
736  /*
737  * If the circuit build time is much greater than we would have cut
738  * it off at, we probably had a suspend event along this codepath,
739  * and we should discard the value.
740  */
741  if (timercmp(&victim->timestamp_began, &extremely_old_cutoff, OP_LT)) {
742  log_notice(LD_CIRC,
743  "Extremely large value for circuit build timeout: %lds. "
744  "Assuming clock jump. Purpose %d (%s)",
745  (long)(now.tv_sec - victim->timestamp_began.tv_sec),
746  victim->purpose,
747  circuit_purpose_to_string(victim->purpose));
750  first_hop_succeeded,
751  (time_t)victim->timestamp_created.tv_sec)) {
753  }
754  }
755  }
756 
757  /* If this is a hidden service client circuit which is far enough along in
758  * connecting to its destination, and we haven't already flagged it as
759  * 'timed out', flag it so we'll launch another intro or rend circ, but
760  * don't mark it for close yet.
761  *
762  * (Circs flagged as 'timed out' are given a much longer timeout
763  * period above, so we won't close them in the next call to
764  * circuit_expire_building.) */
765  if (!(TO_ORIGIN_CIRCUIT(victim)->hs_circ_has_timed_out)) {
766  switch (victim->purpose) {
768  /* We only want to spare a rend circ iff it has been specified in an
769  * INTRODUCE1 cell sent to a hidden service. */
770  if (!hs_circ_is_rend_sent_in_intro1(CONST_TO_ORIGIN_CIRCUIT(victim))) {
771  break;
772  }
773  FALLTHROUGH;
776  /* If we have reached this line, we want to spare the circ for now. */
777  log_info(LD_CIRC,"Marking circ %u (state %d:%s, purpose %d) "
778  "as timed-out HS circ",
779  (unsigned)victim->n_circ_id,
780  victim->state, circuit_state_to_string(victim->state),
781  victim->purpose);
783  continue;
784  default:
785  break;
786  }
787  }
788 
789  /* If this is a service-side rendezvous circuit which is far
790  * enough along in connecting to its destination, consider sparing
791  * it. */
792  if (!(TO_ORIGIN_CIRCUIT(victim)->hs_circ_has_timed_out) &&
793  victim->purpose == CIRCUIT_PURPOSE_S_CONNECT_REND) {
794  log_info(LD_CIRC,"Marking circ %u (state %d:%s, purpose %d) "
795  "as timed-out HS circ; relaunching rendezvous attempt.",
796  (unsigned)victim->n_circ_id,
797  victim->state, circuit_state_to_string(victim->state),
798  victim->purpose);
801  continue;
802  }
803 
804  if (victim->n_chan)
805  log_info(LD_CIRC,
806  "Abandoning circ %u %s:%u (state %d,%d:%s, purpose %d, "
807  "len %d)", TO_ORIGIN_CIRCUIT(victim)->global_identifier,
808  channel_describe_peer(victim->n_chan),
809  (unsigned)victim->n_circ_id,
810  TO_ORIGIN_CIRCUIT(victim)->has_opened,
811  victim->state, circuit_state_to_string(victim->state),
812  victim->purpose,
813  TO_ORIGIN_CIRCUIT(victim)->build_state ?
814  TO_ORIGIN_CIRCUIT(victim)->build_state->desired_path_len :
815  -1);
816  else
817  log_info(LD_CIRC,
818  "Abandoning circ %u %u (state %d,%d:%s, purpose %d, len %d)",
819  TO_ORIGIN_CIRCUIT(victim)->global_identifier,
820  (unsigned)victim->n_circ_id,
821  TO_ORIGIN_CIRCUIT(victim)->has_opened,
822  victim->state,
823  circuit_state_to_string(victim->state), victim->purpose,
824  TO_ORIGIN_CIRCUIT(victim)->build_state ?
825  TO_ORIGIN_CIRCUIT(victim)->build_state->desired_path_len :
826  -1);
827 
829  tor_trace(TR_SUBSYS(circuit), TR_EV(timeout), TO_ORIGIN_CIRCUIT(victim));
830  if (victim->purpose == CIRCUIT_PURPOSE_C_MEASURE_TIMEOUT)
831  circuit_mark_for_close(victim, END_CIRC_REASON_MEASUREMENT_EXPIRED);
832  else
833  circuit_mark_for_close(victim, END_CIRC_REASON_TIMEOUT);
834 
836  } SMARTLIST_FOREACH_END(victim);
837 }
838 
839 /**
840  * Mark for close all circuits that start here, that were built through a
841  * guard we weren't sure if we wanted to use, and that have been waiting
842  * around for way too long.
843  */
844 void
846 {
848  origin_circuit_t *, circ) {
849  if (TO_CIRCUIT(circ)->marked_for_close)
850  continue;
851  if (circ->guard_state == NULL)
852  continue;
854  circuit_mark_for_close(TO_CIRCUIT(circ), END_CIRC_REASON_NONE);
855  } SMARTLIST_FOREACH_END(circ);
856 }
857 
858 /** For debugging #8387: track when we last called
859  * circuit_expire_old_circuits_clientside. */
861 
862 /**
863  * As a diagnostic for bug 8387, log information about how many one-hop
864  * circuits we have around that have been there for at least <b>age</b>
865  * seconds. Log a few of them. Ignores Single Onion Service intro, it is
866  * expected to be long-term one-hop circuits.
867  */
868 void
870 {
871 #define MAX_ANCIENT_ONEHOP_CIRCUITS_TO_LOG 10
872  time_t now = time(NULL);
873  time_t cutoff = now - age;
874  int n_found = 0;
875  smartlist_t *log_these = smartlist_new();
876  const or_options_t *options = get_options();
877 
879  const origin_circuit_t *ocirc;
880  if (! CIRCUIT_IS_ORIGIN(circ))
881  continue;
882  if (circ->timestamp_created.tv_sec >= cutoff)
883  continue;
884  /* Single Onion Services deliberately make long term one-hop intro
885  * and rendezvous connections. Don't log the established ones. */
886  if (hs_service_allow_non_anonymous_connection(options) &&
887  (circ->purpose == CIRCUIT_PURPOSE_S_INTRO ||
888  circ->purpose == CIRCUIT_PURPOSE_S_REND_JOINED))
889  continue;
890  ocirc = CONST_TO_ORIGIN_CIRCUIT(circ);
891 
892  if (ocirc->build_state && ocirc->build_state->onehop_tunnel) {
893  ++n_found;
894 
895  if (smartlist_len(log_these) < MAX_ANCIENT_ONEHOP_CIRCUITS_TO_LOG)
896  smartlist_add(log_these, (origin_circuit_t*) ocirc);
897  }
898  }
899  SMARTLIST_FOREACH_END(circ);
900 
901  if (n_found == 0)
902  goto done;
903 
904  log_notice(LD_HEARTBEAT,
905  "Diagnostic for issue 8387: Found %d one-hop circuits more "
906  "than %d seconds old! Logging %d...",
907  n_found, age, smartlist_len(log_these));
908 
909  SMARTLIST_FOREACH_BEGIN(log_these, const origin_circuit_t *, ocirc) {
910  char created[ISO_TIME_LEN+1];
911  int stream_num;
912  const edge_connection_t *conn;
913  char *dirty = NULL;
914  const circuit_t *circ = TO_CIRCUIT(ocirc);
915 
916  format_local_iso_time(created,
917  (time_t)circ->timestamp_created.tv_sec);
918 
919  if (circ->timestamp_dirty) {
920  char dirty_since[ISO_TIME_LEN+1];
921  format_local_iso_time(dirty_since, circ->timestamp_dirty);
922 
923  tor_asprintf(&dirty, "Dirty since %s (%ld seconds vs %ld-second cutoff)",
924  dirty_since, (long)(now - circ->timestamp_dirty),
925  (long) options->MaxCircuitDirtiness);
926  } else {
927  dirty = tor_strdup("Not marked dirty");
928  }
929 
930  log_notice(LD_HEARTBEAT, " #%d created at %s. %s, %s. %s for close. "
931  "Package window: %d. "
932  "%s for new conns. %s.",
933  ocirc_sl_idx,
934  created,
937  circ->marked_for_close ? "Marked" : "Not marked",
938  circ->package_window,
939  ocirc->unusable_for_new_conns ? "Not usable" : "usable",
940  dirty);
941  tor_free(dirty);
942 
943  stream_num = 0;
944  for (conn = ocirc->p_streams; conn; conn = conn->next_stream) {
945  const connection_t *c = TO_CONN(conn);
946  char stream_created[ISO_TIME_LEN+1];
947  if (++stream_num >= 5)
948  break;
949 
950  format_local_iso_time(stream_created, c->timestamp_created);
951 
952  log_notice(LD_HEARTBEAT, " Stream#%d created at %s. "
953  "%s conn in state %s. "
954  "It is %slinked and %sreading from a linked connection %p. "
955  "Package window %d. "
956  "%s for close (%s:%d). Hold-open is %sset. "
957  "Has %ssent RELAY_END. %s on circuit.",
958  stream_num,
959  stream_created,
962  c->linked ? "" : "not ",
963  c->reading_from_linked_conn ? "": "not",
964  c->linked_conn,
965  conn->package_window,
966  c->marked_for_close ? "Marked" : "Not marked",
968  c->marked_for_close,
969  c->hold_open_until_flushed ? "" : "not ",
970  conn->edge_has_sent_end ? "" : "not ",
971  conn->edge_blocked_on_circ ? "Blocked" : "Not blocked");
972  if (! c->linked_conn)
973  continue;
974 
975  c = c->linked_conn;
976 
977  log_notice(LD_HEARTBEAT, " Linked to %s connection in state %s "
978  "(Purpose %d). %s for close (%s:%d). Hold-open is %sset. ",
981  c->purpose,
982  c->marked_for_close ? "Marked" : "Not marked",
984  c->marked_for_close,
985  c->hold_open_until_flushed ? "" : "not ");
986  }
987  } SMARTLIST_FOREACH_END(ocirc);
988 
989  log_notice(LD_HEARTBEAT, "It has been %ld seconds since I last called "
990  "circuit_expire_old_circuits_clientside().",
991  (long)(now - last_expired_clientside_circuits));
992 
993  done:
994  smartlist_free(log_these);
995 }
996 
997 /** Remove any elements in <b>needed_ports</b> that are handled by an
998  * open or in-progress circuit.
999  */
1000 void
1002 {
1003  int i;
1004  uint16_t *port;
1005 
1006  for (i = 0; i < smartlist_len(needed_ports); ++i) {
1007  port = smartlist_get(needed_ports, i);
1008  tor_assert(*port);
1009  if (circuit_stream_is_being_handled(NULL, *port,
1011  log_debug(LD_CIRC,"Port %d is already being handled; removing.", *port);
1012  smartlist_del(needed_ports, i--);
1013  tor_free(port);
1014  } else {
1015  log_debug(LD_CIRC,"Port %d is not handled.", *port);
1016  }
1017  }
1018 }
1019 
1020 /** Return 1 if at least <b>min</b> general-purpose non-internal circuits
1021  * will have an acceptable exit node for exit stream <b>conn</b> if it
1022  * is defined, else for "*:port".
1023  * Else return 0.
1024  */
1025 int
1027  uint16_t port, int min)
1028 {
1029  const node_t *exitnode;
1030  int num=0;
1031  time_t now = time(NULL);
1032  int need_uptime = smartlist_contains_int_as_string(
1033  get_options()->LongLivedPorts,
1034  conn ? conn->socks_request->port : port);
1035 
1037  if (CIRCUIT_IS_ORIGIN(circ) &&
1038  !circ->marked_for_close &&
1039  circ->purpose == CIRCUIT_PURPOSE_C_GENERAL &&
1040  (!circ->timestamp_dirty ||
1041  circ->timestamp_dirty + get_options()->MaxCircuitDirtiness > now)) {
1042  origin_circuit_t *origin_circ = TO_ORIGIN_CIRCUIT(circ);
1043  cpath_build_state_t *build_state = origin_circ->build_state;
1044  if (build_state->is_internal || build_state->onehop_tunnel)
1045  continue;
1046  if (origin_circ->unusable_for_new_conns)
1047  continue;
1048  if (origin_circ->isolation_values_set &&
1049  (conn == NULL ||
1050  !connection_edge_compatible_with_circuit(conn, origin_circ)))
1051  continue;
1052 
1053  exitnode = build_state_get_exit_node(build_state);
1054  if (exitnode && (!need_uptime || build_state->need_uptime)) {
1055  int ok;
1056  if (conn) {
1057  ok = connection_ap_can_use_exit(conn, exitnode);
1058  } else {
1060  r = compare_tor_addr_to_node_policy(NULL, port, exitnode);
1062  }
1063  if (ok) {
1064  if (++num >= min)
1065  return 1;
1066  }
1067  }
1068  }
1069  }
1070  SMARTLIST_FOREACH_END(circ);
1071  return 0;
1072 }
1073 
1074 /** Don't keep more than this many unused open circuits around. */
1075 #define MAX_UNUSED_OPEN_CIRCUITS 14
1076 
1077 /* Return true if a circuit is available for use, meaning that it is open,
1078  * clean, usable for new multi-hop connections, and a general purpose origin
1079  * circuit.
1080  * Accept any kind of circuit, return false if the above conditions are not
1081  * met. */
1082 STATIC int
1083 circuit_is_available_for_use(const circuit_t *circ)
1084 {
1085  const origin_circuit_t *origin_circ;
1086  cpath_build_state_t *build_state;
1087 
1088  if (!CIRCUIT_IS_ORIGIN(circ))
1089  return 0; /* We first filter out only origin circuits before doing the
1090  following checks. */
1091  if (circ->marked_for_close)
1092  return 0; /* Don't mess with marked circs */
1093  if (circ->timestamp_dirty)
1094  return 0; /* Only count clean circs */
1095  if (circ->purpose != CIRCUIT_PURPOSE_C_GENERAL &&
1097  return 0; /* We only pay attention to general purpose circuits.
1098  General purpose circuits are always origin circuits. */
1099 
1100  origin_circ = CONST_TO_ORIGIN_CIRCUIT(circ);
1101  if (origin_circ->unusable_for_new_conns)
1102  return 0;
1103 
1104  build_state = origin_circ->build_state;
1105  if (build_state->onehop_tunnel)
1106  return 0;
1107 
1108  return 1;
1109 }
1110 
1111 /* Return true if we need any more exit circuits.
1112  * needs_uptime and needs_capacity are set only if we need more exit circuits.
1113  * Check if we know of a port that's been requested recently and no circuit
1114  * is currently available that can handle it. */
1115 STATIC int
1116 needs_exit_circuits(time_t now, int *needs_uptime, int *needs_capacity)
1117 {
1118  return (!circuit_all_predicted_ports_handled(now, needs_uptime,
1119  needs_capacity) &&
1120  router_have_consensus_path() == CONSENSUS_PATH_EXIT);
1121 }
1122 
1123 /* Hidden services need at least this many internal circuits */
1124 #define SUFFICIENT_UPTIME_INTERNAL_HS_SERVERS 3
1125 
1126 /* Return true if we need any more hidden service server circuits.
1127  * HS servers only need an internal circuit. */
1128 STATIC int
1129 needs_hs_server_circuits(time_t now, int num_uptime_internal)
1130 {
1131  if (!hs_service_get_num_services()) {
1132  /* No services, we don't need anything. */
1133  goto no_need;
1134  }
1135 
1136  if (num_uptime_internal >= SUFFICIENT_UPTIME_INTERNAL_HS_SERVERS) {
1137  /* We have sufficient amount of internal circuit. */
1138  goto no_need;
1139  }
1140 
1141  if (router_have_consensus_path() == CONSENSUS_PATH_UNKNOWN) {
1142  /* Consensus hasn't been checked or might be invalid so requesting
1143  * internal circuits is not wise. */
1144  goto no_need;
1145  }
1146 
1147  /* At this point, we need a certain amount of circuits and we will most
1148  * likely use them for rendezvous so we note down the use of internal
1149  * circuit for our prediction for circuit needing uptime and capacity. */
1150  rep_hist_note_used_internal(now, 1, 1);
1151 
1152  return 1;
1153  no_need:
1154  return 0;
1155 }
1156 
1157 /* We need at least this many internal circuits for hidden service clients */
1158 #define SUFFICIENT_INTERNAL_HS_CLIENTS 3
1159 
1160 /* We need at least this much uptime for internal circuits for hidden service
1161  * clients */
1162 #define SUFFICIENT_UPTIME_INTERNAL_HS_CLIENTS 2
1163 
1164 /* Return true if we need any more hidden service client circuits.
1165  * HS clients only need an internal circuit. */
1166 STATIC int
1167 needs_hs_client_circuits(time_t now, int *needs_uptime, int *needs_capacity,
1168  int num_internal, int num_uptime_internal)
1169 {
1170  int used_internal_recently = rep_hist_get_predicted_internal(now,
1171  needs_uptime,
1172  needs_capacity);
1173  int requires_uptime = num_uptime_internal <
1174  SUFFICIENT_UPTIME_INTERNAL_HS_CLIENTS &&
1175  needs_uptime;
1176 
1177  return (used_internal_recently &&
1178  (requires_uptime || num_internal < SUFFICIENT_INTERNAL_HS_CLIENTS) &&
1179  router_have_consensus_path() != CONSENSUS_PATH_UNKNOWN);
1180 }
1181 
1182 /* This is how many circuits can be opened concurrently during the cbt learning
1183  * phase. This number cannot exceed the tor-wide MAX_UNUSED_OPEN_CIRCUITS. */
1184 #define DFLT_CBT_UNUSED_OPEN_CIRCS (10)
1185 #define MIN_CBT_UNUSED_OPEN_CIRCS 0
1186 #define MAX_CBT_UNUSED_OPEN_CIRCS MAX_UNUSED_OPEN_CIRCUITS
1187 
1188 /* Return true if we need more circuits for a good build timeout.
1189  * XXXX make the assumption that build timeout streams should be
1190  * created whenever we can build internal circuits. */
1191 STATIC int
1192 needs_circuits_for_build(int num)
1193 {
1194  if (router_have_consensus_path() != CONSENSUS_PATH_UNKNOWN) {
1195  if (num < networkstatus_get_param(NULL, "cbtmaxopencircs",
1196  DFLT_CBT_UNUSED_OPEN_CIRCS,
1197  MIN_CBT_UNUSED_OPEN_CIRCS,
1198  MAX_CBT_UNUSED_OPEN_CIRCS) &&
1201  return 1;
1202  }
1203  }
1204  return 0;
1205 }
1206 
1207 /**
1208  * Launch the appropriate type of predicted circuit for hidden
1209  * services, depending on our options.
1210  */
1211 static void
1213 {
1214  /* K.I.S.S. implementation of bug #23101: If we are using
1215  * vanguards or pinned middles, pre-build a specific purpose
1216  * for HS circs. */
1219  } else {
1220  /* If no vanguards, then no HS-specific prebuilt circuits are needed.
1221  * Normal GENERAL circs are fine */
1223  }
1224 }
1225 
1226 /** Determine how many circuits we have open that are clean,
1227  * Make sure it's enough for all the upcoming behaviors we predict we'll have.
1228  * But put an upper bound on the total number of circuits.
1229  */
1230 static void
1232 {
1233  int num=0, num_internal=0, num_uptime_internal=0;
1234  int hidserv_needs_uptime=0, hidserv_needs_capacity=1;
1235  int port_needs_uptime=0, port_needs_capacity=1;
1236  time_t now = time(NULL);
1237  int flags = 0;
1238 
1239  /* Count how many of each type of circuit we currently have. */
1241  if (!circuit_is_available_for_use(circ))
1242  continue;
1243 
1244  num++;
1245 
1246  cpath_build_state_t *build_state = TO_ORIGIN_CIRCUIT(circ)->build_state;
1247  if (build_state->is_internal)
1248  num_internal++;
1249  if (build_state->need_uptime && build_state->is_internal)
1250  num_uptime_internal++;
1251  }
1252  SMARTLIST_FOREACH_END(circ);
1253 
1254  /* If that's enough, then stop now. */
1255  if (num >= MAX_UNUSED_OPEN_CIRCUITS)
1256  return;
1257 
1258  if (needs_exit_circuits(now, &port_needs_uptime, &port_needs_capacity)) {
1259  if (port_needs_uptime)
1260  flags |= CIRCLAUNCH_NEED_UPTIME;
1261  if (port_needs_capacity)
1262  flags |= CIRCLAUNCH_NEED_CAPACITY;
1263 
1264  log_info(LD_CIRC,
1265  "Have %d clean circs (%d internal), need another exit circ.",
1266  num, num_internal);
1268  return;
1269  }
1270 
1271  if (needs_hs_server_circuits(now, num_uptime_internal)) {
1274 
1275  log_info(LD_CIRC,
1276  "Have %d clean circs (%d internal), need another internal "
1277  "circ for my hidden service.",
1278  num, num_internal);
1280  return;
1281  }
1282 
1283  if (needs_hs_client_circuits(now, &hidserv_needs_uptime,
1284  &hidserv_needs_capacity,
1285  num_internal, num_uptime_internal))
1286  {
1287  if (hidserv_needs_uptime)
1288  flags |= CIRCLAUNCH_NEED_UPTIME;
1289  if (hidserv_needs_capacity)
1290  flags |= CIRCLAUNCH_NEED_CAPACITY;
1291  flags |= CIRCLAUNCH_IS_INTERNAL;
1292 
1293  log_info(LD_CIRC,
1294  "Have %d clean circs (%d uptime-internal, %d internal), need"
1295  " another hidden service circ.",
1296  num, num_uptime_internal, num_internal);
1297 
1299  return;
1300  }
1301 
1302  if (needs_circuits_for_build(num)) {
1303  flags = CIRCLAUNCH_NEED_CAPACITY;
1304  /* if there are no exits in the consensus, make timeout
1305  * circuits internal */
1306  if (router_have_consensus_path() == CONSENSUS_PATH_INTERNAL)
1307  flags |= CIRCLAUNCH_IS_INTERNAL;
1308 
1309  log_info(LD_CIRC,
1310  "Have %d clean circs need another buildtime test circ.", num);
1312  return;
1313  }
1314 }
1315 
1316 /** Build a new test circuit every 5 minutes */
1317 #define TESTING_CIRCUIT_INTERVAL 300
1318 
1319 /** This function is called once a second, if router_have_minimum_dir_info()
1320  * is true. Its job is to make sure all services we offer have enough circuits
1321  * available. Some services just want enough circuits for current tasks,
1322  * whereas others want a minimum set of idle circuits hanging around.
1323  */
1324 void
1326 {
1327  const or_options_t *options = get_options();
1328 
1329  /* launch a new circ for any pending streams that need one
1330  * XXXX make the assumption that (some) AP streams (i.e. HS clients)
1331  * don't require an exit circuit, review in #13814.
1332  * This allows HSs to function in a consensus without exits. */
1333  if (router_have_consensus_path() != CONSENSUS_PATH_UNKNOWN)
1335 
1337 
1338  if (!options->DisablePredictedCircuits)
1340 }
1341 
1342 /**
1343  * Called once a second either directly or from
1344  * circuit_build_needed_circs(). As appropriate (once per NewCircuitPeriod)
1345  * resets failure counts and expires old circuits.
1346  */
1347 void
1349 {
1350  static time_t time_to_expire_and_reset = 0;
1351 
1352  if (time_to_expire_and_reset < now) {
1354  time_to_expire_and_reset = now + get_options()->NewCircuitPeriod;
1355  if (proxy_mode(get_options()))
1356  addressmap_clean(now);
1358 
1359 #if 0 /* disable for now, until predict-and-launch-new can cull leftovers */
1360 
1361  /* If we ever re-enable, this has to move into
1362  * circuit_build_needed_circs */
1363 
1364  circ = circuit_get_youngest_clean_open(CIRCUIT_PURPOSE_C_GENERAL);
1365  if (get_options()->RunTesting &&
1366  circ &&
1367  circ->timestamp_began.tv_sec + TESTING_CIRCUIT_INTERVAL < now) {
1368  log_fn(LOG_INFO,"Creating a new testing circuit.");
1370  }
1371 #endif /* 0 */
1372  }
1373 }
1374 
1375 /** If the stream <b>conn</b> is a member of any of the linked
1376  * lists of <b>circ</b>, then remove it from the list.
1377  */
1378 void
1380 {
1381  edge_connection_t *prevconn;
1382 
1383  tor_assert(circ);
1384  tor_assert(conn);
1385 
1386  if (conn->base_.type == CONN_TYPE_AP) {
1387  entry_connection_t *entry_conn = EDGE_TO_ENTRY_CONN(conn);
1388  entry_conn->may_use_optimistic_data = 0;
1389  }
1390  conn->cpath_layer = NULL; /* don't keep a stale pointer */
1391  conn->on_circuit = NULL;
1392 
1393  if (CIRCUIT_IS_ORIGIN(circ)) {
1394  origin_circuit_t *origin_circ = TO_ORIGIN_CIRCUIT(circ);
1395  int removed = 0;
1396  if (conn == origin_circ->p_streams) {
1397  origin_circ->p_streams = conn->next_stream;
1398  removed = 1;
1399  } else {
1400  for (prevconn = origin_circ->p_streams;
1401  prevconn && prevconn->next_stream && prevconn->next_stream != conn;
1402  prevconn = prevconn->next_stream)
1403  ;
1404  if (prevconn && prevconn->next_stream) {
1405  prevconn->next_stream = conn->next_stream;
1406  removed = 1;
1407  }
1408  }
1409  if (removed) {
1410  log_debug(LD_APP, "Removing stream %d from circ %u",
1411  conn->stream_id, (unsigned)circ->n_circ_id);
1412 
1413  /* If the stream was removed, and it was a rend stream, decrement the
1414  * number of streams on the circuit associated with the rend service.
1415  */
1416  if (circ->purpose == CIRCUIT_PURPOSE_S_REND_JOINED) {
1417  hs_dec_rdv_stream_counter(origin_circ);
1418  }
1419 
1420  /* If there are no more streams on this circ, tell circpad */
1421  if (!origin_circ->p_streams)
1423 
1424  return;
1425  }
1426  } else {
1427  or_circuit_t *or_circ = TO_OR_CIRCUIT(circ);
1428  if (conn == or_circ->n_streams) {
1429  or_circ->n_streams = conn->next_stream;
1430  return;
1431  }
1432  if (conn == or_circ->resolving_streams) {
1433  or_circ->resolving_streams = conn->next_stream;
1434  return;
1435  }
1436 
1437  for (prevconn = or_circ->n_streams;
1438  prevconn && prevconn->next_stream && prevconn->next_stream != conn;
1439  prevconn = prevconn->next_stream)
1440  ;
1441  if (prevconn && prevconn->next_stream) {
1442  prevconn->next_stream = conn->next_stream;
1443  return;
1444  }
1445 
1446  for (prevconn = or_circ->resolving_streams;
1447  prevconn && prevconn->next_stream && prevconn->next_stream != conn;
1448  prevconn = prevconn->next_stream)
1449  ;
1450  if (prevconn && prevconn->next_stream) {
1451  prevconn->next_stream = conn->next_stream;
1452  return;
1453  }
1454  }
1455 
1456  log_warn(LD_BUG,"Edge connection not in circuit's list.");
1457  /* Don't give an error here; it's harmless. */
1459 }
1460 
1461 /** Find each circuit that has been unused for too long, or dirty
1462  * for too long and has no streams on it: mark it for close.
1463  */
1464 STATIC void
1466 {
1467  struct timeval cutoff, now;
1468 
1469  tor_gettimeofday(&now);
1470  last_expired_clientside_circuits = now.tv_sec;
1471 
1473  if (circ->marked_for_close || !CIRCUIT_IS_ORIGIN(circ))
1474  continue;
1475 
1476  cutoff = now;
1477  cutoff.tv_sec -= TO_ORIGIN_CIRCUIT(circ)->circuit_idle_timeout;
1478 
1479  /* If the circuit has been dirty for too long, and there are no streams
1480  * on it, mark it for close.
1481  */
1482  if (circ->timestamp_dirty &&
1483  circ->timestamp_dirty + get_options()->MaxCircuitDirtiness <
1484  now.tv_sec &&
1485  !TO_ORIGIN_CIRCUIT(circ)->p_streams /* nothing attached */ ) {
1486  log_debug(LD_CIRC, "Closing n_circ_id %u (dirty %ld sec ago, "
1487  "purpose %d)",
1488  (unsigned)circ->n_circ_id,
1489  (long)(now.tv_sec - circ->timestamp_dirty),
1490  circ->purpose);
1491  /* Don't do this magic for testing circuits. Their death is governed
1492  * by circuit_expire_building */
1493  if (circ->purpose != CIRCUIT_PURPOSE_PATH_BIAS_TESTING) {
1494  tor_trace(TR_SUBSYS(circuit), TR_EV(idle_timeout),
1495  TO_ORIGIN_CIRCUIT(circ));
1496  circuit_mark_for_close(circ, END_CIRC_REASON_FINISHED);
1497  }
1498  } else if (!circ->timestamp_dirty && circ->state == CIRCUIT_STATE_OPEN) {
1499  if (timercmp(&circ->timestamp_began, &cutoff, OP_LT)) {
1500  if (circ->purpose == CIRCUIT_PURPOSE_C_GENERAL ||
1501  circ->purpose == CIRCUIT_PURPOSE_C_HSDIR_GET ||
1502  circ->purpose == CIRCUIT_PURPOSE_S_HSDIR_POST ||
1503  circ->purpose == CIRCUIT_PURPOSE_HS_VANGUARDS ||
1504  circ->purpose == CIRCUIT_PURPOSE_C_MEASURE_TIMEOUT ||
1505  circ->purpose == CIRCUIT_PURPOSE_S_ESTABLISH_INTRO ||
1506  circ->purpose == CIRCUIT_PURPOSE_TESTING ||
1507  circ->purpose == CIRCUIT_PURPOSE_C_CIRCUIT_PADDING ||
1508  (circ->purpose >= CIRCUIT_PURPOSE_C_INTRODUCING &&
1509  circ->purpose <= CIRCUIT_PURPOSE_C_REND_READY_INTRO_ACKED) ||
1510  circ->purpose == CIRCUIT_PURPOSE_S_CONNECT_REND) {
1511  log_info(LD_CIRC,
1512  "Closing circuit %"PRIu32
1513  " that has been unused for %ld msec.",
1514  TO_ORIGIN_CIRCUIT(circ)->global_identifier,
1515  tv_mdiff(&circ->timestamp_began, &now));
1516  tor_trace(TR_SUBSYS(circuit), TR_EV(idle_timeout),
1517  TO_ORIGIN_CIRCUIT(circ));
1518  circuit_mark_for_close(circ, END_CIRC_REASON_FINISHED);
1519  } else if (!TO_ORIGIN_CIRCUIT(circ)->is_ancient) {
1520  /* Server-side rend joined circuits can end up really old, because
1521  * they are reused by clients for longer than normal. The client
1522  * controls their lifespan. (They never become dirty, because
1523  * connection_exit_begin_conn() never marks anything as dirty.)
1524  * Similarly, server-side intro circuits last a long time. */
1525  if (circ->purpose != CIRCUIT_PURPOSE_S_REND_JOINED &&
1526  circ->purpose != CIRCUIT_PURPOSE_S_INTRO) {
1527  log_notice(LD_CIRC,
1528  "Ancient non-dirty circuit %d is still around after "
1529  "%ld milliseconds. Purpose: %d (%s)",
1530  TO_ORIGIN_CIRCUIT(circ)->global_identifier,
1531  tv_mdiff(&circ->timestamp_began, &now),
1532  circ->purpose,
1533  circuit_purpose_to_string(circ->purpose));
1534  TO_ORIGIN_CIRCUIT(circ)->is_ancient = 1;
1535  }
1536  }
1537  }
1538  }
1539  } SMARTLIST_FOREACH_END(circ);
1540 }
1541 
1542 /** How long do we wait before killing circuits with the properties
1543  * described below?
1544  *
1545  * Probably we could choose a number here as low as 5 to 10 seconds,
1546  * since these circs are used for begindir, and a) generally you either
1547  * ask another begindir question right after or you don't for a long time,
1548  * b) clients at least through 0.2.1.x choose from the whole set of
1549  * directory mirrors at each choice, and c) re-establishing a one-hop
1550  * circuit via create-fast is a light operation assuming the TLS conn is
1551  * still there.
1552  *
1553  * I expect "b" to go away one day when we move to using directory
1554  * guards, but I think "a" and "c" are good enough reasons that a low
1555  * number is safe even then.
1556  */
1557 #define IDLE_ONE_HOP_CIRC_TIMEOUT 60
1558 
1559 /** Find each non-origin circuit that has been unused for too long,
1560  * has no streams on it, came from a client, and ends here: mark it
1561  * for close.
1562  */
1563 void
1565 {
1566  or_circuit_t *or_circ;
1567  time_t cutoff = now - IDLE_ONE_HOP_CIRC_TIMEOUT;
1568 
1570  if (circ->marked_for_close || CIRCUIT_IS_ORIGIN(circ))
1571  continue;
1572  or_circ = TO_OR_CIRCUIT(circ);
1573  /* If the circuit has been idle for too long, and there are no streams
1574  * on it, and it ends here, and it used a create_fast, mark it for close.
1575  *
1576  * Also if there is a rend_splice on it, it's a single onion service
1577  * circuit and we should not close it.
1578  */
1579  if (or_circ->p_chan && channel_is_client(or_circ->p_chan) &&
1580  !circ->n_chan &&
1581  !or_circ->n_streams && !or_circ->resolving_streams &&
1582  !or_circ->rend_splice &&
1583  channel_when_last_xmit(or_circ->p_chan) <= cutoff) {
1584  log_info(LD_CIRC, "Closing circ_id %u (empty %d secs ago)",
1585  (unsigned)or_circ->p_circ_id,
1586  (int)(now - channel_when_last_xmit(or_circ->p_chan)));
1587  circuit_mark_for_close(circ, END_CIRC_REASON_FINISHED);
1588  }
1589  }
1590  SMARTLIST_FOREACH_END(circ);
1591 }
1592 
1593 /** Number of testing circuits we want open before testing our bandwidth. */
1594 #define NUM_PARALLEL_TESTING_CIRCS 4
1595 
1596 /** True iff we've ever had enough testing circuits open to test our
1597  * bandwidth. */
1599 
1600 /** Reset have_performed_bandwidth_test, so we'll start building
1601  * testing circuits again so we can exercise our bandwidth. */
1602 void
1604 {
1606 }
1607 
1608 /** Return 1 if we've already exercised our bandwidth, or if we
1609  * have fewer than NUM_PARALLEL_TESTING_CIRCS testing circuits
1610  * established or on the way. Else return 0.
1611  */
1612 int
1614 {
1615  int num = 0;
1616 
1618  return 1;
1619 
1621  if (!circ->marked_for_close && CIRCUIT_IS_ORIGIN(circ) &&
1622  circ->purpose == CIRCUIT_PURPOSE_TESTING &&
1623  circ->state == CIRCUIT_STATE_OPEN)
1624  num++;
1625  }
1626  SMARTLIST_FOREACH_END(circ);
1627  return num >= NUM_PARALLEL_TESTING_CIRCS;
1628 }
1629 
1630 /** A testing circuit has completed. Take whatever stats we want.
1631  * Noticing reachability is taken care of in onionskin_answer(),
1632  * so there's no need to record anything here. But if we still want
1633  * to do the bandwidth test, and we now have enough testing circuits
1634  * open, do it.
1635  */
1636 static void
1638 {
1641  /* either we've already done everything we want with testing circuits,
1642  * OR this IPv4 testing circuit became open due to a fluke, e.g. we picked
1643  * a last hop where we already had the connection open due to a
1644  * outgoing local circuit, OR this is an IPv6 self-test circuit, not
1645  * a bandwidth test circuit. */
1646  circuit_mark_for_close(TO_CIRCUIT(circ), END_CIRC_AT_ORIGIN);
1647  } else if (circuit_enough_testing_circs()) {
1650  } else {
1652  }
1653 }
1654 
1655 /** A testing circuit has failed to build. Take whatever stats we want. */
1656 static void
1658 {
1659  const or_options_t *options = get_options();
1660  if (server_mode(options) &&
1661  router_all_orports_seem_reachable(options))
1662  return;
1663 
1664  log_info(LD_GENERAL,
1665  "Our testing circuit (to see if your ORPort is reachable) "
1666  "has failed. I'll try again later.");
1667 
1668  /* These aren't used yet. */
1669  (void)circ;
1670  (void)at_last_hop;
1671 }
1672 
1673 /** The circuit <b>circ</b> has just become open. Take the next
1674  * step: for rendezvous circuits, we pass circ to the appropriate
1675  * function in rendclient or rendservice. For general circuits, we
1676  * call connection_ap_attach_pending, which looks for pending streams
1677  * that could use circ.
1678  */
1679 void
1681 {
1682  tor_trace(TR_SUBSYS(circuit), TR_EV(opened), circ);
1683  circuit_event_status(circ, CIRC_EVENT_BUILT, 0);
1684 
1685  /* Remember that this circuit has finished building. Now if we start
1686  * it building again later (e.g. by extending it), we will know not
1687  * to consider its build time. */
1688  circ->has_opened = 1;
1689 
1690  switch (TO_CIRCUIT(circ)->purpose) {
1693  /* Start building an intro circ if we don't have one yet. */
1695  /* This isn't a call to circuit_try_attaching_streams because a
1696  * circuit in _C_ESTABLISH_REND state isn't connected to its
1697  * hidden service yet, thus we can't attach streams to it yet,
1698  * thus circuit_try_attaching_streams would always clear the
1699  * circuit's isolation state. circuit_try_attaching_streams is
1700  * called later, when the rend circ enters _C_REND_JOINED
1701  * state. */
1702  break;
1705  break;
1709  /* Tell any AP connections that have been waiting for a new
1710  * circuit that one is ready. */
1712  break;
1714  /* at the service, waiting for introductions */
1716  break;
1718  /* at the service, connecting to rend point */
1720  break;
1722  circuit_testing_opened(circ);
1723  break;
1724  /* default:
1725  * This won't happen in normal operation, but might happen if the
1726  * controller did it. Just let it slide. */
1727  }
1728 }
1729 
1730 /** If the stream-isolation state of <b>circ</b> can be cleared, clear
1731  * it. Return non-zero iff <b>circ</b>'s isolation state was cleared. */
1732 static int
1734 {
1735  if (/* The circuit may have become non-open if it was cannibalized.*/
1736  circ->base_.state == CIRCUIT_STATE_OPEN &&
1737  /* If !isolation_values_set, there is nothing to clear. */
1738  circ->isolation_values_set &&
1739  /* It's not legal to clear a circuit's isolation info if it's ever had
1740  * streams attached */
1742  /* If we have any isolation information set on this circuit, and
1743  * we didn't manage to attach any streams to it, then we can
1744  * and should clear it and try again. */
1746  return 1;
1747  } else {
1748  return 0;
1749  }
1750 }
1751 
1752 /** Called when a circuit becomes ready for streams to be attached to
1753  * it. */
1754 void
1756 {
1757  /* Attach streams to this circuit if we can. */
1759 
1760  /* The call to circuit_try_clearing_isolation_state here will do
1761  * nothing and return 0 if we didn't attach any streams to circ
1762  * above. */
1764  /* Maybe *now* we can attach some streams to this circuit. */
1766  }
1767 }
1768 
1769 /** Called whenever a circuit could not be successfully built.
1770  */
1771 void
1773 {
1774  channel_t *n_chan = NULL;
1775  /* we should examine circ and see if it failed because of
1776  * the last hop or an earlier hop. then use this info below.
1777  */
1778  int failed_at_last_hop = 0;
1779 
1780  /* First, check to see if this was a path failure, rather than build
1781  * failure.
1782  *
1783  * Note that we deliberately use circuit_get_cpath_len() (and not
1784  * circuit_get_cpath_opened_len()) because we only want to ensure
1785  * that a full path is *chosen*. This is different than a full path
1786  * being *built*. We only want to count *build* failures below.
1787  *
1788  * Path selection failures can happen spuriously for a number
1789  * of reasons (such as aggressive/invalid user-specified path
1790  * restrictions in the torrc, insufficient microdescriptors, and
1791  * non-user reasons like exitpolicy issues), and so should not be
1792  * counted as failures below.
1793  */
1794  if (circuit_get_cpath_len(circ) < circ->build_state->desired_path_len) {
1795  static ratelim_t pathfail_limit = RATELIM_INIT(3600);
1796  log_fn_ratelim(&pathfail_limit, LOG_NOTICE, LD_CIRC,
1797  "Our circuit %u (id: %" PRIu32 ") died due to an invalid "
1798  "selected path, purpose %s. This may be a torrc "
1799  "configuration issue, or a bug.",
1800  TO_CIRCUIT(circ)->n_circ_id, circ->global_identifier,
1801  circuit_purpose_to_string(TO_CIRCUIT(circ)->purpose));
1802 
1803  /* If the path failed on an RP, retry it. */
1804  if (TO_CIRCUIT(circ)->purpose == CIRCUIT_PURPOSE_S_CONNECT_REND)
1806 
1807  /* In all other cases, just bail. The rest is just failure accounting
1808  * that we don't want to do */
1809  return;
1810  }
1811 
1812  /* If the last hop isn't open, and the second-to-last is, we failed
1813  * at the last hop. */
1814  if (circ->cpath &&
1815  circ->cpath->prev->state != CPATH_STATE_OPEN &&
1816  circ->cpath->prev->prev->state == CPATH_STATE_OPEN) {
1817  failed_at_last_hop = 1;
1818  }
1819 
1820  /* Check if we failed at first hop */
1821  if (circ->cpath &&
1822  circ->cpath->state != CPATH_STATE_OPEN &&
1823  ! circ->base_.received_destroy) {
1824  /* We failed at the first hop for some reason other than a DESTROY cell.
1825  * If there's an OR connection to blame, blame it. Also, avoid this relay
1826  * for a while, and fail any one-hop directory fetches destined for it. */
1827  const char *n_chan_ident = circ->cpath->extend_info->identity_digest;
1828  tor_assert(n_chan_ident);
1829  int already_marked = 0;
1830  if (circ->base_.n_chan) {
1831  n_chan = circ->base_.n_chan;
1832 
1833  if (n_chan->is_bad_for_new_circs) {
1834  /* We only want to blame this router when a fresh healthy
1835  * connection fails. So don't mark this router as newly failed,
1836  * since maybe this was just an old circuit attempt that's
1837  * finally timing out now. Also, there's no need to blow away
1838  * circuits/streams/etc, since the failure of an unhealthy conn
1839  * doesn't tell us much about whether a healthy conn would
1840  * succeed. */
1841  already_marked = 1;
1842  }
1843  log_info(LD_OR,
1844  "Our circuit %u (id: %" PRIu32 ") failed to get a response "
1845  "from the first hop (%s). I'm going to try to rotate to a "
1846  "better connection.",
1847  TO_CIRCUIT(circ)->n_circ_id, circ->global_identifier,
1848  channel_describe_peer(n_chan));
1849  n_chan->is_bad_for_new_circs = 1;
1850  } else {
1851  log_info(LD_OR,
1852  "Our circuit %u (id: %" PRIu32 ") died before the first hop "
1853  "with no connection",
1854  TO_CIRCUIT(circ)->n_circ_id, circ->global_identifier);
1855  }
1856  if (!already_marked) {
1857  /*
1858  * If we have guard state (new guard API) and our path selection
1859  * code actually chose a full path, then blame the failure of this
1860  * circuit on the guard.
1861  */
1862  if (circ->guard_state)
1864  /* if there are any one-hop streams waiting on this circuit, fail
1865  * them now so they can retry elsewhere. */
1866  connection_ap_fail_onehop(n_chan_ident, circ->build_state);
1867  }
1868  }
1869 
1870  switch (circ->base_.purpose) {
1874  /* If we never built the circuit, note it as a failure. */
1876  if (failed_at_last_hop) {
1877  /* Make sure any streams that demand our last hop as their exit
1878  * know that it's unlikely to happen. */
1880  }
1881  break;
1883  circuit_testing_failed(circ, failed_at_last_hop);
1884  break;
1886  /* at the service, waiting for introductions */
1887  if (circ->base_.state != CIRCUIT_STATE_OPEN) {
1889  }
1890  /* no need to care here, because the service will rebuild intro
1891  * points periodically. */
1892  break;
1894  /* at the client, connecting to intro point */
1895  /* Don't increment failure count, since the service may have picked
1896  * the introduction point maliciously */
1897  /* The client will pick a new intro point when this one dies, if
1898  * the stream in question still cares. No need to act here. */
1899  break;
1901  /* at the client, waiting for the service */
1903  /* the client will pick a new rend point when this one dies, if
1904  * the stream in question still cares. No need to act here. */
1905  break;
1907  /* at the service, connecting to rend point */
1908  /* Don't increment failure count, since the client may have picked
1909  * the rendezvous point maliciously */
1910  log_info(LD_REND,
1911  "Couldn't connect to the client's chosen rend point %s "
1912  "(%s hop failed).",
1914  failed_at_last_hop?"last":"non-last");
1916  break;
1917  /* default:
1918  * This won't happen in normal operation, but might happen if the
1919  * controller did it. Just let it slide. */
1920  }
1921 }
1922 
1923 /** Number of consecutive failures so far; should only be touched by
1924  * circuit_launch_new and circuit_*_failure_count.
1925  */
1926 static int n_circuit_failures = 0;
1927 /** Before the last time we called circuit_reset_failure_count(), were
1928  * there a lot of failures? */
1930 
1931 /** Don't retry launching a new circuit if we try this many times with no
1932  * success. */
1933 #define MAX_CIRCUIT_FAILURES 5
1934 
1935 /** Launch a new circuit; see circuit_launch_by_extend_info() for
1936  * details on arguments. */
1938 circuit_launch(uint8_t purpose, int flags)
1939 {
1940  return circuit_launch_by_extend_info(purpose, NULL, flags);
1941 }
1942 
1943 /* Do we have enough descriptors to build paths?
1944  * If need_exit is true, return 1 if we can build exit paths.
1945  * (We need at least one Exit in the consensus to build exit paths.)
1946  * If need_exit is false, return 1 if we can build internal paths.
1947  */
1948 static int
1949 have_enough_path_info(int need_exit)
1950 {
1951  if (need_exit)
1952  return router_have_consensus_path() == CONSENSUS_PATH_EXIT;
1953  else
1954  return router_have_consensus_path() != CONSENSUS_PATH_UNKNOWN;
1955 }
1956 
1957 /**
1958  * Tell us if a circuit is a hidden service circuit.
1959  */
1960 int
1962 {
1963  /* HS Vanguard purpose. */
1964  if (circuit_purpose_is_hs_vanguards(purpose)) {
1965  return 1;
1966  }
1967 
1968  /* Client-side purpose */
1969  if (circuit_purpose_is_hs_client(purpose)) {
1970  return 1;
1971  }
1972 
1973  /* Service-side purpose */
1974  if (circuit_purpose_is_hs_service(purpose)) {
1975  return 1;
1976  }
1977 
1978  return 0;
1979 }
1980 
1981 /** Return true iff the given circuit is an HS client circuit. */
1982 bool
1983 circuit_purpose_is_hs_client(const uint8_t purpose)
1984 {
1985  return (purpose >= CIRCUIT_PURPOSE_C_HS_MIN_ &&
1986  purpose <= CIRCUIT_PURPOSE_C_HS_MAX_);
1987 }
1988 
1989 /** Return true iff the given circuit is an HS service circuit. */
1990 bool
1991 circuit_purpose_is_hs_service(const uint8_t purpose)
1992 {
1993  return (purpose >= CIRCUIT_PURPOSE_S_HS_MIN_ &&
1994  purpose <= CIRCUIT_PURPOSE_S_HS_MAX_);
1995 }
1996 
1997 /** Return true iff the given circuit is an HS Vanguards circuit. */
1998 bool
1999 circuit_purpose_is_hs_vanguards(const uint8_t purpose)
2000 {
2001  return (purpose == CIRCUIT_PURPOSE_HS_VANGUARDS);
2002 }
2003 
2004 /** Return true iff the given circuit is an HS v3 circuit. */
2005 bool
2007 {
2008  return (CIRCUIT_IS_ORIGIN(circ) &&
2009  (CONST_TO_ORIGIN_CIRCUIT(circ)->hs_ident != NULL));
2010 }
2011 
2012 /**
2013  * Return true if this circuit purpose should use vanguards
2014  * or pinned Layer2 or Layer3 guards.
2015  *
2016  * This function takes both the circuit purpose and the
2017  * torrc options for pinned middles/vanguards into account
2018  * (ie: the circuit must be a hidden service circuit and
2019  * vanguards/pinned middles must be enabled for it to return
2020  * true).
2021  */
2022 int
2024 {
2025  const or_options_t *options = get_options();
2026 
2027  /* Only hidden service circuits use vanguards */
2028  if (!circuit_purpose_is_hidden_service(purpose))
2029  return 0;
2030 
2031  /* Pinned middles are effectively vanguards */
2032  if (options->HSLayer2Nodes || options->HSLayer3Nodes)
2033  return 1;
2034 
2035  return 0;
2036 }
2037 
2038 /**
2039  * Return true for the set of conditions for which it is OK to use
2040  * a cannibalized circuit.
2041  *
2042  * Don't cannibalize for onehops, or certain purposes.
2043  */
2044 static int
2045 circuit_should_cannibalize_to_build(uint8_t purpose_to_build,
2046  int has_extend_info,
2047  int onehop_tunnel)
2048 {
2049 
2050  /* Do not try to cannibalize if this is a one hop circuit. */
2051  if (onehop_tunnel) {
2052  return 0;
2053  }
2054 
2055  /* Don't try to cannibalize for general purpose circuits that do not
2056  * specify a custom exit. */
2057  if (purpose_to_build == CIRCUIT_PURPOSE_C_GENERAL && !has_extend_info) {
2058  return 0;
2059  }
2060 
2061  /* Don't cannibalize for testing circuits. We want to see if they
2062  * complete normally. Also don't cannibalize for vanguard-purpose
2063  * circuits, since those are specially pre-built for later
2064  * cannibalization by the actual specific circuit types that need
2065  * vanguards.
2066  */
2067  if (purpose_to_build == CIRCUIT_PURPOSE_TESTING ||
2068  purpose_to_build == CIRCUIT_PURPOSE_HS_VANGUARDS) {
2069  return 0;
2070  }
2071 
2072  /* For vanguards, the server-side intro circ is not cannibalized
2073  * because we pre-build 4 hop HS circuits, and it only needs a 3 hop
2074  * circuit. It is also long-lived, so it is more important that
2075  * it have lower latency than get built fast.
2076  */
2077  if (circuit_should_use_vanguards(purpose_to_build) &&
2078  purpose_to_build == CIRCUIT_PURPOSE_S_ESTABLISH_INTRO) {
2079  return 0;
2080  }
2081 
2082  return 1;
2083 }
2084 
2085 /** Launch a new circuit with purpose <b>purpose</b> and exit node
2086  * <b>extend_info</b> (or NULL to select a random exit node).
2087  *
2088  * If flags contains:
2089  * - CIRCLAUNCH_ONEHOP_TUNNEL: the circuit will have only one hop;
2090  * - CIRCLAUNCH_NEED_UPTIME: choose routers with high uptime;
2091  * - CIRCLAUNCH_NEED_CAPACITY: choose routers with high bandwidth;
2092  * - CIRCLAUNCH_IS_IPV6_SELFTEST: the second-last hop must support IPv6
2093  * extends;
2094  * - CIRCLAUNCH_IS_INTERNAL: the last hop need not be an exit node;
2095  * - CIRCLAUNCH_IS_V3_RP: the last hop must support v3 onion service
2096  * rendezvous.
2097  *
2098  * Return the newly allocated circuit on success, or NULL on failure. */
2101  extend_info_t *extend_info,
2102  int flags)
2103 {
2104  origin_circuit_t *circ;
2105  int onehop_tunnel = (flags & CIRCLAUNCH_ONEHOP_TUNNEL) != 0;
2106  int have_path = have_enough_path_info(! (flags & CIRCLAUNCH_IS_INTERNAL) );
2107 
2108  /* Keep some stats about our attempts to launch HS rendezvous circuits */
2109  if (purpose == CIRCUIT_PURPOSE_S_CONNECT_REND) {
2111  }
2112 
2113  if (!onehop_tunnel && (!router_have_minimum_dir_info() || !have_path)) {
2114  log_debug(LD_CIRC,"Haven't %s yet; canceling "
2115  "circuit launch.",
2117  "fetched enough directory info" :
2118  "received a consensus with exits");
2119  return NULL;
2120  }
2121 
2122  /* If we can/should cannibalize another circuit to build this one,
2123  * then do so. */
2125  extend_info != NULL,
2126  onehop_tunnel)) {
2127  /* see if there are appropriate circs available to cannibalize. */
2128  /* XXX if we're planning to add a hop, perhaps we want to look for
2129  * internal circs rather than exit circs? -RD */
2130  circ = circuit_find_to_cannibalize(purpose, extend_info, flags);
2131  if (circ) {
2132  uint8_t old_purpose = circ->base_.purpose;
2133  struct timeval old_timestamp_began = circ->base_.timestamp_began;
2134 
2135  log_info(LD_CIRC, "Cannibalizing circ %u (id: %" PRIu32 ") for "
2136  "purpose %d (%s)",
2137  TO_CIRCUIT(circ)->n_circ_id, circ->global_identifier, purpose,
2138  circuit_purpose_to_string(purpose));
2139 
2140  if ((purpose == CIRCUIT_PURPOSE_S_CONNECT_REND ||
2141  purpose == CIRCUIT_PURPOSE_C_INTRODUCING) &&
2143  /* Path bias: Cannibalized rends pre-emptively count as a
2144  * successfully built but unused closed circuit. We don't
2145  * wait until the extend (or the close) because the rend
2146  * point could be malicious.
2147  *
2148  * Same deal goes for client side introductions. Clients
2149  * can be manipulated to connect repeatedly to them
2150  * (especially web clients).
2151  *
2152  * If we decide to probe the initial portion of these circs,
2153  * (up to the adversary's final hop), we need to remove this,
2154  * or somehow mark the circuit with a special path state.
2155  */
2156 
2157  /* This must be called before the purpose change */
2158  pathbias_check_close(circ, END_CIRC_REASON_FINISHED);
2159  }
2160 
2161  circuit_change_purpose(TO_CIRCUIT(circ), purpose);
2162  /* Reset the start date of this circ, else expire_building
2163  * will see it and think it's been trying to build since it
2164  * began.
2165  *
2166  * Technically, the code should reset this when the
2167  * create cell is finally sent, but we're close enough
2168  * here. */
2169  tor_gettimeofday(&circ->base_.timestamp_began);
2170 
2171  control_event_circuit_cannibalized(circ, old_purpose,
2172  &old_timestamp_began);
2173 
2174  switch (purpose) {
2176  /* it's ready right now */
2177  break;
2184  /* need to add a new hop */
2185  tor_assert(extend_info);
2186  if (circuit_extend_to_new_exit(circ, extend_info) < 0)
2187  return NULL;
2188  break;
2189  default:
2190  log_warn(LD_BUG,
2191  "unexpected purpose %d when cannibalizing a circ.",
2192  purpose);
2194  return NULL;
2195  }
2196 
2197  tor_trace(TR_SUBSYS(circuit), TR_EV(cannibalized), circ);
2198  return circ;
2199  }
2200  }
2201 
2204  /* too many failed circs in a row. don't try. */
2205 // log_fn(LOG_INFO,"%d failures so far, not trying.",n_circuit_failures);
2206  return NULL;
2207  }
2208 
2209  /* try a circ. if it fails, circuit_mark_for_close will increment
2210  * n_circuit_failures */
2211  return circuit_establish_circuit(purpose, extend_info, flags);
2212 }
2213 
2214 /** Record another failure at opening a general circuit. When we have
2215  * too many, we'll stop trying for the remainder of this minute.
2216  */
2217 static void
2219 {
2221  log_debug(LD_CIRC,"n_circuit_failures now %d.",n_circuit_failures);
2222 }
2223 
2224 /** Reset the failure count for opening general circuits. This means
2225  * we will try MAX_CIRCUIT_FAILURES times more (if necessary) before
2226  * stopping again.
2227  */
2228 void
2230 {
2233  else
2235  n_circuit_failures = 0;
2236 }
2237 
2238 /** Find an open circ that we're happy to use for <b>conn</b> and return 1. If
2239  * there isn't one, and there isn't one on the way, launch one and return
2240  * 0. If it will never work, return -1.
2241  *
2242  * Write the found or in-progress or launched circ into *circp.
2243  */
2244 static int
2246  uint8_t desired_circuit_purpose,
2247  origin_circuit_t **circp)
2248 {
2249  origin_circuit_t *circ;
2250  int check_exit_policy;
2251  int need_uptime, need_internal;
2252  int want_onehop;
2253  const or_options_t *options = get_options();
2254 
2255  tor_assert(conn);
2256  tor_assert(circp);
2257  if (ENTRY_TO_CONN(conn)->state != AP_CONN_STATE_CIRCUIT_WAIT) {
2258  connection_t *c = ENTRY_TO_CONN(conn);
2259  log_err(LD_BUG, "Connection state mismatch: wanted "
2260  "AP_CONN_STATE_CIRCUIT_WAIT, but got %d (%s)",
2261  c->state, conn_state_to_string(c->type, c->state));
2262  }
2264 
2265  /* Will the exit policy of the exit node apply to this stream? */
2266  check_exit_policy =
2268  !conn->use_begindir &&
2270 
2271  /* Does this connection want a one-hop circuit? */
2272  want_onehop = conn->want_onehop;
2273 
2274  /* Do we need a high-uptime circuit? */
2275  need_uptime = !conn->want_onehop && !conn->use_begindir &&
2277  conn->socks_request->port);
2278 
2279  /* Do we need an "internal" circuit? */
2280  if (desired_circuit_purpose != CIRCUIT_PURPOSE_C_GENERAL)
2281  need_internal = 1;
2282  else if (conn->use_begindir || conn->want_onehop)
2283  need_internal = 1;
2284  else
2285  need_internal = 0;
2286 
2287  /* We now know what kind of circuit we need. See if there is an
2288  * open circuit that we can use for this stream */
2289  circ = circuit_get_best(conn, 1 /* Insist on open circuits */,
2290  desired_circuit_purpose,
2291  need_uptime, need_internal);
2292 
2293  if (circ) {
2294  /* We got a circuit that will work for this stream! We can return it. */
2295  *circp = circ;
2296  return 1; /* we're happy */
2297  }
2298 
2299  /* Okay, there's no circuit open that will work for this stream. Let's
2300  * see if there's an in-progress circuit or if we have to launch one */
2301 
2302  /* Do we know enough directory info to build circuits at all? */
2303  int have_path = have_enough_path_info(!need_internal);
2304 
2305  if (!want_onehop && (!router_have_minimum_dir_info() || !have_path)) {
2306  /* If we don't have enough directory information, we can't build
2307  * multihop circuits.
2308  */
2310  int severity = LOG_NOTICE;
2311  /* Retry some stuff that might help the connection work. */
2312  /* If we are configured with EntryNodes or UseBridges */
2313  if (entry_list_is_constrained(options)) {
2314  /* Retry all our guards / bridges.
2315  * guards_retry_optimistic() always returns true here. */
2316  int rv = guards_retry_optimistic(options);
2317  tor_assert_nonfatal_once(rv);
2318  log_fn(severity, LD_APP|LD_DIR,
2319  "Application request when we haven't %s. "
2320  "Optimistically trying known %s again.",
2322  "used client functionality lately" :
2323  "received a consensus with exits",
2324  options->UseBridges ? "bridges" : "entrynodes");
2325  } else {
2326  /* Getting directory documents doesn't help much if we have a limited
2327  * number of guards */
2328  tor_assert_nonfatal(!options->UseBridges);
2329  tor_assert_nonfatal(!options->EntryNodes);
2330  /* Retry our directory fetches, so we have a fresh set of guard info */
2331  log_fn(severity, LD_APP|LD_DIR,
2332  "Application request when we haven't %s. "
2333  "Optimistically trying directory fetches again.",
2335  "used client functionality lately" :
2336  "received a consensus with exits");
2338  }
2339  }
2340  /* Since we didn't have enough directory info, we can't attach now. The
2341  * stream will be dealt with when router_have_minimum_dir_info becomes 1,
2342  * or when all directory attempts fail and directory_all_unreachable()
2343  * kills it.
2344  */
2345  return 0;
2346  }
2347 
2348  /* Check whether the exit policy of the chosen exit, or the exit policies
2349  * of _all_ nodes, would forbid this node. */
2350  if (check_exit_policy) {
2351  if (!conn->chosen_exit_name) {
2352  struct in_addr in;
2353  tor_addr_t addr, *addrp=NULL;
2354  if (tor_inet_aton(conn->socks_request->address, &in)) {
2355  tor_addr_from_in(&addr, &in);
2356  addrp = &addr;
2357  }
2359  conn->socks_request->port,
2360  need_uptime)) {
2361  log_notice(LD_APP,
2362  "No Tor server allows exit to %s:%d. Rejecting.",
2363  safe_str_client(conn->socks_request->address),
2364  conn->socks_request->port);
2365  return -1;
2366  }
2367  } else {
2368  /* XXXX Duplicates checks in connection_ap_handshake_attach_circuit:
2369  * refactor into a single function. */
2370  const node_t *node = node_get_by_nickname(conn->chosen_exit_name, 0);
2371  int opt = conn->chosen_exit_optional;
2372  if (node && !connection_ap_can_use_exit(conn, node)) {
2373  log_fn(opt ? LOG_INFO : LOG_WARN, LD_APP,
2374  "Requested exit point '%s' is excluded or "
2375  "would refuse request. %s.",
2376  conn->chosen_exit_name, opt ? "Trying others" : "Closing");
2377  if (opt) {
2378  conn->chosen_exit_optional = 0;
2379  tor_free(conn->chosen_exit_name);
2380  /* Try again. */
2381  return circuit_get_open_circ_or_launch(conn,
2382  desired_circuit_purpose,
2383  circp);
2384  }
2385  return -1;
2386  }
2387  }
2388  }
2389 
2390  /* Now, check whether there already a circuit on the way that could handle
2391  * this stream. This check matches the one above, but this time we
2392  * do not require that the circuit will work. */
2393  circ = circuit_get_best(conn, 0 /* don't insist on open circuits */,
2394  desired_circuit_purpose,
2395  need_uptime, need_internal);
2396  if (circ)
2397  log_debug(LD_CIRC, "one on the way!");
2398 
2399  if (!circ) {
2400  /* No open or in-progress circuit could handle this stream! We
2401  * will have to launch one!
2402  */
2403 
2404  /* The chosen exit node, if there is one. */
2405  extend_info_t *extend_info=NULL;
2406  const int n_pending = count_pending_general_client_circuits();
2407 
2408  /* Do we have too many pending circuits? */
2409  if (n_pending >= options->MaxClientCircuitsPending) {
2410  static ratelim_t delay_limit = RATELIM_INIT(10*60);
2411  char *m;
2412  if ((m = rate_limit_log(&delay_limit, approx_time()))) {
2413  log_notice(LD_APP, "We'd like to launch a circuit to handle a "
2414  "connection, but we already have %d general-purpose client "
2415  "circuits pending. Waiting until some finish.%s",
2416  n_pending, m);
2417  tor_free(m);
2418  }
2419  return 0;
2420  }
2421 
2422  /* If this is a hidden service trying to start an introduction point,
2423  * handle that case. */
2424  if (desired_circuit_purpose == CIRCUIT_PURPOSE_C_INTRODUCE_ACK_WAIT) {
2425  const edge_connection_t *edge_conn = ENTRY_TO_EDGE_CONN(conn);
2426  /* need to pick an intro point */
2427  extend_info = hs_client_get_random_intro_from_edge(edge_conn);
2428  if (!extend_info) {
2429  log_info(LD_REND, "No intro points: re-fetching service descriptor.");
2430  hs_client_refetch_hsdesc(&edge_conn->hs_ident->identity_pk);
2432  return 0;
2433  }
2434  log_info(LD_REND,"Chose %s as intro point for service",
2435  extend_info_describe(extend_info));
2436  }
2437 
2438  /* If we have specified a particular exit node for our
2439  * connection, then be sure to open a circuit to that exit node.
2440  */
2441  if (desired_circuit_purpose == CIRCUIT_PURPOSE_C_GENERAL ||
2442  desired_circuit_purpose == CIRCUIT_PURPOSE_S_HSDIR_POST ||
2443  desired_circuit_purpose == CIRCUIT_PURPOSE_C_HSDIR_GET) {
2444  if (conn->chosen_exit_name) {
2445  const node_t *r;
2446  int opt = conn->chosen_exit_optional;
2447  r = node_get_by_nickname(conn->chosen_exit_name, 0);
2448  if (r && node_has_preferred_descriptor(r, conn->want_onehop ? 1 : 0)) {
2449  /* We might want to connect to an IPv6 bridge for loading
2450  descriptors so we use the preferred address rather than
2451  the primary. */
2452  extend_info = extend_info_from_node(r, conn->want_onehop ? 1 : 0);
2453  if (!extend_info) {
2454  log_warn(LD_CIRC,"Could not make a one-hop connection to %s. "
2455  "Discarding this circuit.", conn->chosen_exit_name);
2456  return -1;
2457  }
2458  } else { /* ! (r && node_has_preferred_descriptor(...)) */
2459  log_debug(LD_DIR, "considering %d, %s",
2460  want_onehop, conn->chosen_exit_name);
2461  if (want_onehop && conn->chosen_exit_name[0] == '$') {
2462  /* We're asking for a one-hop circuit to a router that
2463  * we don't have a routerinfo about. Make up an extend_info. */
2464  /* XXX prop220: we need to make chosen_exit_name able to
2465  * encode both key formats. This is not absolutely critical
2466  * since this is just for one-hop circuits, but we should
2467  * still get it done */
2468  char digest[DIGEST_LEN];
2469  char *hexdigest = conn->chosen_exit_name+1;
2470  tor_addr_t addr;
2471  if (strlen(hexdigest) < HEX_DIGEST_LEN ||
2472  base16_decode(digest,DIGEST_LEN,
2473  hexdigest,HEX_DIGEST_LEN) != DIGEST_LEN) {
2474  log_info(LD_DIR, "Broken exit digest on tunnel conn. Closing.");
2475  return -1;
2476  }
2477  if (tor_addr_parse(&addr, conn->socks_request->address) < 0) {
2478  log_info(LD_DIR, "Broken address %s on tunnel conn. Closing.",
2480  return -1;
2481  }
2482  /* XXXX prop220 add a workaround for ed25519 ID below*/
2483  extend_info = extend_info_new(conn->chosen_exit_name+1,
2484  digest,
2485  NULL, /* Ed25519 ID */
2486  NULL, NULL, /* onion keys */
2487  &addr, conn->socks_request->port);
2488  } else { /* ! (want_onehop && conn->chosen_exit_name[0] == '$') */
2489  /* We will need an onion key for the router, and we
2490  * don't have one. Refuse or relax requirements. */
2491  log_fn(opt ? LOG_INFO : LOG_WARN, LD_APP,
2492  "Requested exit point '%s' is not known. %s.",
2493  conn->chosen_exit_name, opt ? "Trying others" : "Closing");
2494  if (opt) {
2495  conn->chosen_exit_optional = 0;
2496  tor_free(conn->chosen_exit_name);
2497  /* Try again with no requested exit */
2498  return circuit_get_open_circ_or_launch(conn,
2499  desired_circuit_purpose,
2500  circp);
2501  }
2502  return -1;
2503  }
2504  }
2505  }
2506  } /* Done checking for general circutis with chosen exits. */
2507 
2508  /* What purpose do we need to launch this circuit with? */
2509  uint8_t new_circ_purpose;
2510  if (desired_circuit_purpose == CIRCUIT_PURPOSE_C_REND_JOINED)
2511  new_circ_purpose = CIRCUIT_PURPOSE_C_ESTABLISH_REND;
2512  else if (desired_circuit_purpose == CIRCUIT_PURPOSE_C_INTRODUCE_ACK_WAIT)
2513  new_circ_purpose = CIRCUIT_PURPOSE_C_INTRODUCING;
2514  else
2515  new_circ_purpose = desired_circuit_purpose;
2516 
2517  /* Determine what kind of a circuit to launch, and actually launch it. */
2518  {
2519  int flags = CIRCLAUNCH_NEED_CAPACITY;
2520  if (want_onehop) flags |= CIRCLAUNCH_ONEHOP_TUNNEL;
2521  if (need_uptime) flags |= CIRCLAUNCH_NEED_UPTIME;
2522  if (need_internal) flags |= CIRCLAUNCH_IS_INTERNAL;
2523 
2524  /* If we are about to pick a v3 RP right now, make sure we pick a
2525  * rendezvous point that supports the v3 protocol! */
2526  if (desired_circuit_purpose == CIRCUIT_PURPOSE_C_REND_JOINED &&
2527  new_circ_purpose == CIRCUIT_PURPOSE_C_ESTABLISH_REND &&
2528  ENTRY_TO_EDGE_CONN(conn)->hs_ident) {
2529  flags |= CIRCLAUNCH_IS_V3_RP;
2530  log_info(LD_GENERAL, "Getting rendezvous circuit to v3 service!");
2531  }
2532 
2533  circ = circuit_launch_by_extend_info(new_circ_purpose, extend_info,
2534  flags);
2535  }
2536 
2537  extend_info_free(extend_info);
2538 
2539  /* Now trigger things that need to happen when we launch circuits */
2540 
2541  if (desired_circuit_purpose == CIRCUIT_PURPOSE_C_GENERAL ||
2542  desired_circuit_purpose == CIRCUIT_PURPOSE_C_HSDIR_GET ||
2543  desired_circuit_purpose == CIRCUIT_PURPOSE_S_HSDIR_POST) {
2544  /* We just caused a circuit to get built because of this stream.
2545  * If this stream has caused a _lot_ of circuits to be built, that's
2546  * a bad sign: we should tell the user. */
2547  if (conn->num_circuits_launched < NUM_CIRCUITS_LAUNCHED_THRESHOLD &&
2548  ++conn->num_circuits_launched == NUM_CIRCUITS_LAUNCHED_THRESHOLD)
2549  log_info(LD_CIRC, "The application request to %s:%d has launched "
2550  "%d circuits without finding one it likes.",
2552  conn->socks_request->port,
2553  conn->num_circuits_launched);
2554  } else {
2555  /* help predict this next time */
2556  rep_hist_note_used_internal(time(NULL), need_uptime, 1);
2557  if (circ) {
2558  const edge_connection_t *edge_conn = ENTRY_TO_EDGE_CONN(conn);
2559  if (edge_conn->hs_ident) {
2560  circ->hs_ident =
2561  hs_ident_circuit_new(&edge_conn->hs_ident->identity_pk);
2562  }
2563  if (circ->base_.purpose == CIRCUIT_PURPOSE_C_ESTABLISH_REND &&
2564  circ->base_.state == CIRCUIT_STATE_OPEN)
2565  circuit_has_opened(circ);
2566  }
2567  }
2568  } /* endif (!circ) */
2569 
2570  /* We either found a good circuit, or launched a new circuit, or failed to
2571  * do so. Report success, and delay. */
2572 
2573  if (circ) {
2574  /* Mark the circuit with the isolation fields for this connection.
2575  * When the circuit arrives, we'll clear these flags: this is
2576  * just some internal bookkeeping to make sure that we have
2577  * launched enough circuits.
2578  */
2580  } else {
2581  log_info(LD_APP,
2582  "No safe circuit (purpose %d) ready for edge "
2583  "connection; delaying.",
2584  desired_circuit_purpose);
2585  }
2586  *circp = circ;
2587  return 0;
2588 }
2589 
2590 /** Return true iff <b>crypt_path</b> is one of the crypt_paths for
2591  * <b>circ</b>. */
2592 static int
2594 {
2595  crypt_path_t *cpath, *cpath_next = NULL;
2596  for (cpath = circ->cpath; cpath_next != circ->cpath; cpath = cpath_next) {
2597  cpath_next = cpath->next;
2598  if (crypt_path == cpath)
2599  return 1;
2600  }
2601  return 0;
2602 }
2603 
2604 /** Attach the AP stream <b>apconn</b> to circ's linked list of
2605  * p_streams. Also set apconn's cpath_layer to <b>cpath</b>, or to the last
2606  * hop in circ's cpath if <b>cpath</b> is NULL.
2607  */
2608 static void
2610  crypt_path_t *cpath)
2611 {
2612  const node_t *exitnode = NULL;
2613 
2614  /* add it into the linked list of streams on this circuit */
2615  log_debug(LD_APP|LD_CIRC, "attaching new conn to circ. n_circ_id %u.",
2616  (unsigned)circ->base_.n_circ_id);
2617 
2618  /* If this is the first stream on this circuit, tell circpad
2619  * that streams are attached */
2620  if (!circ->p_streams)
2622 
2623  /* reset it, so we can measure circ timeouts */
2624  ENTRY_TO_CONN(apconn)->timestamp_last_read_allowed = time(NULL);
2625  ENTRY_TO_EDGE_CONN(apconn)->next_stream = circ->p_streams;
2626  ENTRY_TO_EDGE_CONN(apconn)->on_circuit = TO_CIRCUIT(circ);
2627  /* assert_connection_ok(conn, time(NULL)); */
2628  circ->p_streams = ENTRY_TO_EDGE_CONN(apconn);
2629 
2631  /* We are attaching a stream to a rendezvous circuit. That means
2632  * that an attempt to connect to a hidden service just
2633  * succeeded. Tell rendclient.c. */
2635  }
2636 
2637  if (cpath) { /* we were given one; use it */
2638  tor_assert(cpath_is_on_circuit(circ, cpath));
2639  } else {
2640  /* use the last hop in the circuit */
2641  tor_assert(circ->cpath);
2642  tor_assert(circ->cpath->prev);
2643  tor_assert(circ->cpath->prev->state == CPATH_STATE_OPEN);
2644  cpath = circ->cpath->prev;
2645  }
2646  ENTRY_TO_EDGE_CONN(apconn)->cpath_layer = cpath;
2647 
2650 
2651  /* Compute the exitnode if possible, for logging below */
2652  if (cpath->extend_info)
2653  exitnode = node_get_by_id(cpath->extend_info->identity_digest);
2654 
2655  /* See if we can use optimistic data on this circuit */
2656  if (circ->base_.purpose == CIRCUIT_PURPOSE_C_GENERAL ||
2657  circ->base_.purpose == CIRCUIT_PURPOSE_C_HSDIR_GET ||
2658  circ->base_.purpose == CIRCUIT_PURPOSE_S_HSDIR_POST ||
2659  circ->base_.purpose == CIRCUIT_PURPOSE_C_REND_JOINED)
2660  apconn->may_use_optimistic_data = 1;
2661  else
2662  apconn->may_use_optimistic_data = 0;
2663  log_info(LD_APP, "Looks like completed circuit to %s %s allow "
2664  "optimistic data for connection to %s",
2665  (circ->base_.purpose == CIRCUIT_PURPOSE_C_GENERAL ||
2666  circ->base_.purpose == CIRCUIT_PURPOSE_CONTROLLER) ?
2667  /* node_describe() does the right thing if exitnode is NULL */
2668  safe_str_client(node_describe(exitnode)) :
2669  "hidden service",
2670  apconn->may_use_optimistic_data ? "does" : "doesn't",
2671  safe_str_client(apconn->socks_request->address));
2672 }
2673 
2674 /** Return true iff <b>address</b> is matched by one of the entries in
2675  * TrackHostExits. */
2676 int
2677 hostname_in_track_host_exits(const or_options_t *options, const char *address)
2678 {
2679  if (!options->TrackHostExits)
2680  return 0;
2681  SMARTLIST_FOREACH_BEGIN(options->TrackHostExits, const char *, cp) {
2682  if (cp[0] == '.') { /* match end */
2683  if (cp[1] == '\0' ||
2684  !strcasecmpend(address, cp) ||
2685  !strcasecmp(address, &cp[1]))
2686  return 1;
2687  } else if (strcasecmp(cp, address) == 0) {
2688  return 1;
2689  }
2690  } SMARTLIST_FOREACH_END(cp);
2691  return 0;
2692 }
2693 
2694 /** If an exit wasn't explicitly specified for <b>conn</b>, consider saving
2695  * the exit that we *did* choose for use by future connections to
2696  * <b>conn</b>'s destination.
2697  */
2698 static void
2700  const origin_circuit_t *circ)
2701 {
2702  const or_options_t *options = get_options();
2703  char *new_address = NULL;
2704  char fp[HEX_DIGEST_LEN+1];
2705  uint64_t stream_id = 0;
2706 
2707  if (BUG(!conn)) {
2708  return;
2709  }
2710 
2711  stream_id = ENTRY_TO_CONN(conn)->global_identifier;
2712 
2713  /* Search the addressmap for this conn's destination. */
2714  /* If they're not in the address map.. */
2715  if (!options->TrackHostExits ||
2717  options->TrackHostExitsExpire))
2718  return; /* nothing to track, or already mapped */
2719 
2720  if (!hostname_in_track_host_exits(options, conn->socks_request->address) ||
2721  !circ->build_state->chosen_exit)
2722  return;
2723 
2724  /* write down the fingerprint of the chosen exit, not the nickname,
2725  * because the chosen exit might not be named. */
2726  base16_encode(fp, sizeof(fp),
2728 
2729  /* Add this exit/hostname pair to the addressmap. */
2730  tor_asprintf(&new_address, "%s.%s.exit",
2731  conn->socks_request->address, fp);
2732 
2733  addressmap_register(conn->socks_request->address, new_address,
2734  time(NULL) + options->TrackHostExitsExpire,
2735  ADDRMAPSRC_TRACKEXIT, 0, 0, stream_id);
2736 }
2737 
2738 /** Attempt to attach the connection <b>conn</b> to <b>circ</b>, and send a
2739  * begin or resolve cell as appropriate. Return values are as for
2740  * connection_ap_handshake_attach_circuit. The stream will exit from the hop
2741  * indicated by <b>cpath</b>, or from the last hop in circ's cpath if
2742  * <b>cpath</b> is NULL. */
2743 int
2745  origin_circuit_t *circ,
2746  crypt_path_t *cpath)
2747 {
2748  connection_t *base_conn = ENTRY_TO_CONN(conn);
2749  tor_assert(conn);
2751  base_conn->state == AP_CONN_STATE_CONTROLLER_WAIT);
2752  tor_assert(conn->socks_request);
2753  tor_assert(circ);
2754  tor_assert(circ->base_.state == CIRCUIT_STATE_OPEN);
2755 
2756  base_conn->state = AP_CONN_STATE_CIRCUIT_WAIT;
2757 
2758  if (!circ->base_.timestamp_dirty ||
2759  ((conn->entry_cfg.isolation_flags & ISO_SOCKSAUTH) &&
2760  (conn->entry_cfg.socks_iso_keep_alive) &&
2761  (conn->socks_request->usernamelen ||
2762  conn->socks_request->passwordlen))) {
2763  /* When stream isolation is in use and controlled by an application
2764  * we are willing to keep using the stream. */
2765  circ->base_.timestamp_dirty = approx_time();
2766  }
2767 
2769 
2770  /* Now, actually link the connection. */
2771  link_apconn_to_circ(conn, circ, cpath);
2772 
2773  tor_assert(conn->socks_request);
2775  if (!conn->use_begindir) {
2776  consider_recording_trackhost(conn, circ);
2777  }
2778  if (connection_ap_handshake_send_begin(conn) < 0)
2779  return -1;
2780  } else {
2782  return -1;
2783  }
2784 
2785  return 1;
2786 }
2787 
2788 /**
2789  * Return an appropriate circuit purpose for non-rend streams.
2790  * We don't handle rends here because a rend stream triggers two
2791  * circuit builds with different purposes, so it is handled elsewhere.
2792  *
2793  * This function just figures out what type of hsdir activity this is,
2794  * and tells us. Everything else is general.
2795  */
2796 static int
2798 {
2799  const connection_t *base_conn = ENTRY_TO_CONN(conn);
2800  tor_assert_nonfatal(!connection_edge_is_rendezvous_stream(
2801  ENTRY_TO_EDGE_CONN(conn)));
2802 
2803  if (base_conn->linked_conn &&
2804  base_conn->linked_conn->type == CONN_TYPE_DIR) {
2805  /* Set a custom purpose for hsdir activity */
2806  if (base_conn->linked_conn->purpose == DIR_PURPOSE_UPLOAD_HSDESC) {
2808  } else if (base_conn->linked_conn->purpose == DIR_PURPOSE_FETCH_HSDESC) {
2810  }
2811  }
2812 
2813  /* All other purposes are general for now */
2815 }
2816 
2817 /** Try to find a safe live circuit for stream <b>conn</b>. If we find one,
2818  * attach the stream, send appropriate cells, and return 1. Otherwise,
2819  * try to launch new circuit(s) for the stream. If we can launch
2820  * circuits, return 0. Otherwise, if we simply can't proceed with
2821  * this stream, return -1. (conn needs to die, and is maybe already marked).
2822  */
2823 /* XXXX this function should mark for close whenever it returns -1;
2824  * its callers shouldn't have to worry about that. */
2825 int
2827 {
2828  connection_t *base_conn = ENTRY_TO_CONN(conn);
2829  int retval;
2830  int conn_age;
2831  int want_onehop;
2832 
2833  tor_assert(conn);
2835  tor_assert(conn->socks_request);
2836  want_onehop = conn->want_onehop;
2837 
2838  conn_age = (int)(time(NULL) - base_conn->timestamp_created);
2839 
2840  /* Is this connection so old that we should give up on it? */
2841  if (conn_age >= get_options()->SocksTimeout) {
2842  int severity = (tor_addr_is_null(&base_conn->addr) && !base_conn->port) ?
2843  LOG_INFO : LOG_NOTICE;
2844  log_fn(severity, LD_APP,
2845  "Tried for %d seconds to get a connection to %s:%d. Giving up.",
2846  conn_age, safe_str_client(conn->socks_request->address),
2847  conn->socks_request->port);
2848  return -1;
2849  }
2850 
2851  /* We handle "general" (non-onion) connections much more straightforwardly.
2852  */
2854  /* we're a general conn */
2855  origin_circuit_t *circ=NULL;
2856 
2857  /* Are we linked to a dir conn that aims to fetch a consensus?
2858  * We check here because the conn might no longer be needed. */
2859  if (base_conn->linked_conn &&
2860  base_conn->linked_conn->type == CONN_TYPE_DIR &&
2862 
2863  /* Yes we are. Is there a consensus fetch farther along than us? */
2864  if (networkstatus_consensus_is_already_downloading(
2865  TO_DIR_CONN(base_conn->linked_conn)->requested_resource)) {
2866  /* We're doing the "multiple consensus fetch attempts" game from
2867  * proposal 210, and we're late to the party. Just close this conn.
2868  * The circuit and TLS conn that we made will time out after a while
2869  * if nothing else wants to use them. */
2870  log_info(LD_DIR, "Closing extra consensus fetch (to %s) since one "
2871  "is already downloading.", base_conn->linked_conn->address);
2872  return -1;
2873  }
2874  }
2875 
2876  /* If we have a chosen exit, we need to use a circuit that's
2877  * open to that exit. See what exit we meant, and whether we can use it.
2878  */
2879  if (conn->chosen_exit_name) {
2880  const node_t *node = node_get_by_nickname(conn->chosen_exit_name, 0);
2881  int opt = conn->chosen_exit_optional;
2882  if (!node && !want_onehop) {
2883  /* We ran into this warning when trying to extend a circuit to a
2884  * hidden service directory for which we didn't have a router
2885  * descriptor. See flyspray task 767 for more details. We should
2886  * keep this in mind when deciding to use BEGIN_DIR cells for other
2887  * directory requests as well. -KL*/
2888  log_fn(opt ? LOG_INFO : LOG_WARN, LD_APP,
2889  "Requested exit point '%s' is not known. %s.",
2890  conn->chosen_exit_name, opt ? "Trying others" : "Closing");
2891  if (opt) {
2892  /* If we are allowed to ignore the .exit request, do so */
2893  conn->chosen_exit_optional = 0;
2894  tor_free(conn->chosen_exit_name);
2895  return 0;
2896  }
2897  return -1;
2898  }
2899  if (node && !connection_ap_can_use_exit(conn, node)) {
2900  log_fn(opt ? LOG_INFO : LOG_WARN, LD_APP,
2901  "Requested exit point '%s' is excluded or "
2902  "would refuse request. %s.",
2903  conn->chosen_exit_name, opt ? "Trying others" : "Closing");
2904  if (opt) {
2905  /* If we are allowed to ignore the .exit request, do so */
2906  conn->chosen_exit_optional = 0;
2907  tor_free(conn->chosen_exit_name);
2908  return 0;
2909  }
2910  return -1;
2911  }
2912  }
2913 
2914  /* Find the circuit that we should use, if there is one. Otherwise
2915  * launch it
2916  */
2917  retval = circuit_get_open_circ_or_launch(conn,
2919  &circ);
2920 
2921  if (retval < 1) {
2922  /* We were either told "-1" (complete failure) or 0 (circuit in
2923  * progress); we can't attach this stream yet. */
2924  return retval;
2925  }
2926 
2927  log_debug(LD_APP|LD_CIRC,
2928  "Attaching apconn to circ %u (stream %d sec old).",
2929  (unsigned)circ->base_.n_circ_id, conn_age);
2930  /* print the circ's path, so clients can figure out which circs are
2931  * sucking. */
2933 
2934  /* We have found a suitable circuit for our conn. Hurray. Do
2935  * the attachment. */
2936  return connection_ap_handshake_attach_chosen_circuit(conn, circ, NULL);
2937 
2938  } else { /* we're a rendezvous conn */
2939  origin_circuit_t *rendcirc=NULL, *introcirc=NULL;
2940 
2941  tor_assert(!ENTRY_TO_EDGE_CONN(conn)->cpath_layer);
2942 
2943  /* start by finding a rendezvous circuit for us */
2944 
2946  conn, CIRCUIT_PURPOSE_C_REND_JOINED, &rendcirc);
2947  if (retval < 0) return -1; /* failed */
2948 
2949  if (retval > 0) {
2950  tor_assert(rendcirc);
2951  /* one is already established, attach */
2952  log_info(LD_REND,
2953  "rend joined circ %u (id: %" PRIu32 ") already here. "
2954  "Attaching. (stream %d sec old)",
2955  (unsigned) TO_CIRCUIT(rendcirc)->n_circ_id,
2956  rendcirc->global_identifier, conn_age);
2957  /* Mark rendezvous circuits as 'newly dirty' every time you use
2958  * them, since the process of rebuilding a rendezvous circ is so
2959  * expensive. There is a tradeoff between linkability and
2960  * feasibility, at this point.
2961  */
2962  rendcirc->base_.timestamp_dirty = time(NULL);
2963 
2964  /* We've also attempted to use them. If they fail, we need to
2965  * probe them for path bias */
2966  pathbias_count_use_attempt(rendcirc);
2967 
2968  link_apconn_to_circ(conn, rendcirc, NULL);
2969  if (connection_ap_handshake_send_begin(conn) < 0)
2970  return 0; /* already marked, let them fade away */
2971  return 1;
2972  }
2973 
2974  /* At this point we need to re-check the state, since it's possible that
2975  * our call to circuit_get_open_circ_or_launch() changed the connection's
2976  * state from "CIRCUIT_WAIT" to "RENDDESC_WAIT" because we decided to
2977  * re-fetch the descriptor.
2978  */
2979  if (ENTRY_TO_CONN(conn)->state != AP_CONN_STATE_CIRCUIT_WAIT) {
2980  log_info(LD_REND, "This connection is no longer ready to attach; its "
2981  "state changed."
2982  "(We probably have to re-fetch its descriptor.)");
2983  return 0;
2984  }
2985 
2986  if (rendcirc && (rendcirc->base_.purpose ==
2988  log_info(LD_REND,
2989  "pending-join circ %u (id: %" PRIu32 ") already here, with "
2990  "intro ack. Stalling. (stream %d sec old)",
2991  (unsigned) TO_CIRCUIT(rendcirc)->n_circ_id,
2992  rendcirc->global_identifier, conn_age);
2993  return 0;
2994  }
2995 
2996  /* it's on its way. find an intro circ. */
2998  conn, CIRCUIT_PURPOSE_C_INTRODUCE_ACK_WAIT, &introcirc);
2999  if (retval < 0) return -1; /* failed */
3000 
3001  if (retval > 0) {
3002  /* one has already sent the intro. keep waiting. */
3003  tor_assert(introcirc);
3004  log_info(LD_REND, "Intro circ %u (id: %" PRIu32 ") present and "
3005  "awaiting ACK. Rend circuit %u (id: %" PRIu32 "). "
3006  "Stalling. (stream %d sec old)",
3007  (unsigned) TO_CIRCUIT(introcirc)->n_circ_id,
3008  introcirc->global_identifier,
3009  rendcirc ? (unsigned) TO_CIRCUIT(rendcirc)->n_circ_id : 0,
3010  rendcirc ? rendcirc->global_identifier : 0,
3011  conn_age);
3012  return 0;
3013  }
3014 
3015  /* now rendcirc and introcirc are each either undefined or not finished */
3016 
3017  if (rendcirc && introcirc &&
3018  rendcirc->base_.purpose == CIRCUIT_PURPOSE_C_REND_READY) {
3019  log_info(LD_REND,
3020  "ready rend circ %u (id: %" PRIu32 ") already here. No"
3021  "intro-ack yet on intro %u (id: %" PRIu32 "). "
3022  "(stream %d sec old)",
3023  (unsigned) TO_CIRCUIT(rendcirc)->n_circ_id,
3024  rendcirc->global_identifier,
3025  (unsigned) TO_CIRCUIT(introcirc)->n_circ_id,
3026  introcirc->global_identifier, conn_age);
3027 
3028  tor_assert(introcirc->base_.purpose == CIRCUIT_PURPOSE_C_INTRODUCING);
3029  if (introcirc->base_.state == CIRCUIT_STATE_OPEN) {
3030  int ret;
3031  log_info(LD_REND, "Found open intro circ %u (id: %" PRIu32 "). "
3032  "Rend circuit %u (id: %" PRIu32 "); Sending "
3033  "introduction. (stream %d sec old)",
3034  (unsigned) TO_CIRCUIT(introcirc)->n_circ_id,
3035  introcirc->global_identifier,
3036  (unsigned) TO_CIRCUIT(rendcirc)->n_circ_id,
3037  rendcirc->global_identifier, conn_age);
3038  ret = hs_client_send_introduce1(introcirc, rendcirc);
3039  switch (ret) {
3040  case 0: /* success */
3041  rendcirc->base_.timestamp_dirty = time(NULL);
3042  introcirc->base_.timestamp_dirty = time(NULL);
3043 
3044  pathbias_count_use_attempt(introcirc);
3045  pathbias_count_use_attempt(rendcirc);
3046 
3047  assert_circuit_ok(TO_CIRCUIT(rendcirc));
3048  assert_circuit_ok(TO_CIRCUIT(introcirc));
3049  return 0;
3050  case -1: /* transient error */
3051  return 0;
3052  case -2: /* permanent error */
3053  return -1;
3054  default: /* oops */
3056  return -1;
3057  }
3058  }
3059  }
3060 
3061  log_info(LD_REND, "Intro %u (id: %" PRIu32 ") and rend circuit %u "
3062  "(id: %" PRIu32 ") circuits are not both ready. "
3063  "Stalling conn. (%d sec old)",
3064  introcirc ? (unsigned) TO_CIRCUIT(introcirc)->n_circ_id : 0,
3065  introcirc ? introcirc->global_identifier : 0,
3066  rendcirc ? (unsigned) TO_CIRCUIT(rendcirc)->n_circ_id : 0,
3067  rendcirc ? rendcirc->global_identifier : 0, conn_age);
3068  return 0;
3069  }
3070 }
3071 
3072 /** Change <b>circ</b>'s purpose to <b>new_purpose</b>. */
3073 void
3074 circuit_change_purpose(circuit_t *circ, uint8_t new_purpose)
3075 {
3076  uint8_t old_purpose;
3077  /* Don't allow an OR circ to become an origin circ or vice versa. */
3078  tor_assert(!!(CIRCUIT_IS_ORIGIN(circ)) ==
3079  !!(CIRCUIT_PURPOSE_IS_ORIGIN(new_purpose)));
3080 
3081  if (circ->purpose == new_purpose) return;
3082 
3083  if (CIRCUIT_IS_ORIGIN(circ)) {
3084  char old_purpose_desc[80] = "";
3085 
3086  strncpy(old_purpose_desc, circuit_purpose_to_string(circ->purpose), 80-1);
3087  old_purpose_desc[80-1] = '\0';
3088 
3089  log_debug(LD_CIRC,
3090  "changing purpose of origin circ %d "
3091  "from \"%s\" (%d) to \"%s\" (%d)",
3092  TO_ORIGIN_CIRCUIT(circ)->global_identifier,
3093  old_purpose_desc,
3094  circ->purpose,
3095  circuit_purpose_to_string(new_purpose),
3096  new_purpose);
3097 
3098  /* Take specific actions if we are repurposing a hidden service circuit. */
3100  !circuit_purpose_is_hidden_service(new_purpose)) {
3102  }
3103  }
3104 
3105  old_purpose = circ->purpose;
3106  circ->purpose = new_purpose;
3107  tor_trace(TR_SUBSYS(circuit), TR_EV(change_purpose), circ, old_purpose,
3108  new_purpose);
3109 
3110  if (CIRCUIT_IS_ORIGIN(circ)) {
3112  old_purpose);
3113 
3115  }
3116 }
3117 
3118 /** Mark <b>circ</b> so that no more connections can be attached to it. */
3119 void
3121 {
3122  const or_options_t *options = get_options();
3123  tor_assert(circ);
3124 
3125  /* XXXX This is a kludge; we're only keeping it around in case there's
3126  * something that doesn't check unusable_for_new_conns, and to avoid
3127  * deeper refactoring of our expiration logic. */
3128  if (! circ->base_.timestamp_dirty)
3129  circ->base_.timestamp_dirty = approx_time();
3130  if (options->MaxCircuitDirtiness >= circ->base_.timestamp_dirty)
3131  circ->base_.timestamp_dirty = 1; /* prevent underflow */
3132  else
3133  circ->base_.timestamp_dirty -= options->MaxCircuitDirtiness;
3134 
3135  circ->unusable_for_new_conns = 1;
3136 }
3137 
3138 /**
3139  * Add relay_body_len and RELAY_PAYLOAD_SIZE-relay_body_len to
3140  * the valid delivered written fields and the overhead field,
3141  * respectively.
3142  */
3143 void
3144 circuit_sent_valid_data(origin_circuit_t *circ, uint16_t relay_body_len)
3145 {
3146  if (!circ) return;
3147 
3148  tor_assertf_nonfatal(relay_body_len <= RELAY_PAYLOAD_SIZE,
3149  "Wrong relay_body_len: %d (should be at most %d)",
3150  relay_body_len, RELAY_PAYLOAD_SIZE);
3151 
3153  tor_add_u32_nowrap(circ->n_delivered_written_circ_bw, relay_body_len);
3155  tor_add_u32_nowrap(circ->n_overhead_written_circ_bw,
3156  RELAY_PAYLOAD_SIZE-relay_body_len);
3157 }
3158 
3159 /**
3160  * Add relay_body_len and RELAY_PAYLOAD_SIZE-relay_body_len to
3161  * the valid delivered read field and the overhead field,
3162  * respectively.
3163  */
3164 void
3165 circuit_read_valid_data(origin_circuit_t *circ, uint16_t relay_body_len)
3166 {
3167  if (!circ) return;
3168 
3169  tor_assert_nonfatal(relay_body_len <= RELAY_PAYLOAD_SIZE);
3170 
3171  circ->n_delivered_read_circ_bw =
3172  tor_add_u32_nowrap(circ->n_delivered_read_circ_bw, relay_body_len);
3173  circ->n_overhead_read_circ_bw =
3174  tor_add_u32_nowrap(circ->n_overhead_read_circ_bw,
3175  RELAY_PAYLOAD_SIZE-relay_body_len);
3176 }
int tor_addr_parse(tor_addr_t *addr, const char *src)
Definition: address.c:1349
int tor_addr_is_null(const tor_addr_t *addr)
Definition: address.c:780
#define tor_addr_from_in(dest, in)
Definition: address.h:331
int addressmap_have_mapping(const char *address, int update_expiry)
Definition: addressmap.c:544
void addressmap_clean(time_t now)
Definition: addressmap.c:320
void addressmap_register(const char *address, char *new_address, time_t expires, addressmap_entry_source_t source, const int wildcard_addr, const int wildcard_new_addr, uint64_t stream_id)
Definition: addressmap.c:576
Header for addressmap.c.
time_t approx_time(void)
Definition: approx_time.c:32
int base16_decode(char *dest, size_t destlen, const char *src, size_t srclen)
Definition: binascii.c:506
void base16_encode(char *dest, size_t destlen, const char *src, size_t srclen)
Definition: binascii.c:478
int n_bits_set_u8(uint8_t v)
Definition: bits.c:72
Header file for circuitbuild.c.
time_t channel_when_last_xmit(channel_t *chan)
Definition: channel.c:3253
int channel_is_client(const channel_t *chan)
Definition: channel.c:2893
const char * channel_state_to_string(channel_state_t state)
Definition: channel.c:315
const char * channel_describe_peer(channel_t *chan)
Definition: channel.c:2815
Header file for channel.c.
void pathbias_count_use_attempt(origin_circuit_t *circ)
Definition: circpathbias.c:604
int pathbias_check_close(origin_circuit_t *ocirc, int reason)
void pathbias_count_timeout(origin_circuit_t *circ)
const char * build_state_get_exit_nickname(cpath_build_state_t *state)
int circuit_extend_to_new_exit(origin_circuit_t *circ, extend_info_t *exit_ei)
origin_circuit_t * circuit_establish_circuit(uint8_t purpose, extend_info_t *exit_ei, int flags)
Definition: circuitbuild.c:477
void circuit_log_path(int severity, unsigned int domain, origin_circuit_t *circ)
Definition: circuitbuild.c:351
const node_t * build_state_get_exit_node(cpath_build_state_t *state)
int circuit_timeout_want_to_count_circ(const origin_circuit_t *circ)
Definition: circuitbuild.c:821
int circuit_all_predicted_ports_handled(time_t now, int *need_uptime, int *need_capacity)
Header file for circuitbuild.c.
origin_circuit_t * circuit_find_to_cannibalize(uint8_t purpose_to_produce, extend_info_t *info, int flags)
Definition: circuitlist.c:1855
const char * circuit_purpose_to_string(uint8_t purpose)
Definition: circuitlist.c:903
int circuit_any_opened_circuits(void)
Definition: circuitlist.c:718
int circuit_get_cpath_len(origin_circuit_t *circ)
Definition: circuitlist.c:1993
void assert_circuit_ok(const circuit_t *c)
Definition: circuitlist.c:2716
smartlist_t * circuit_get_global_list(void)
Definition: circuitlist.c:694
origin_circuit_t * TO_ORIGIN_CIRCUIT(circuit_t *x)
Definition: circuitlist.c:166
smartlist_t * circuit_get_global_origin_circuit_list(void)
Definition: circuitlist.c:703
int circuit_event_status(origin_circuit_t *circ, circuit_status_event_t tp, int reason_code)
Definition: circuitlist.c:499
or_circuit_t * TO_OR_CIRCUIT(circuit_t *x)
Definition: circuitlist.c:154
const char * circuit_state_to_string(int state)
Definition: circuitlist.c:762
Header file for circuitlist.c.
#define CIRCUIT_PURPOSE_S_CONNECT_REND
Definition: circuitlist.h:107
#define CIRCUIT_PURPOSE_C_MEASURE_TIMEOUT
Definition: circuitlist.h:93
#define CIRCUIT_PURPOSE_PATH_BIAS_TESTING
Definition: circuitlist.h:123
#define CIRCUIT_STATE_OPEN
Definition: circuitlist.h:32
#define CIRCUIT_PURPOSE_IS_ORIGIN(p)
Definition: circuitlist.h:140
#define CIRCUIT_PURPOSE_C_REND_JOINED
Definition: circuitlist.h:88
#define CIRCUIT_PURPOSE_S_INTRO
Definition: circuitlist.h:104
#define CIRCUIT_PURPOSE_CONTROLLER
Definition: circuitlist.h:121
#define CIRCUIT_IS_ORIGIN(c)
Definition: circuitlist.h:147
#define CIRCUIT_PURPOSE_C_CIRCUIT_PADDING
Definition: circuitlist.h:95
#define CIRCUIT_PURPOSE_C_REND_READY_INTRO_ACKED
Definition: circuitlist.h:86
#define CIRCUIT_PURPOSE_TESTING
Definition: circuitlist.h:118
#define CIRCUIT_PURPOSE_C_INTRODUCE_ACK_WAIT
Definition: circuitlist.h:76
#define CIRCUIT_PURPOSE_S_REND_JOINED
Definition: circuitlist.h:110
#define CIRCUIT_PURPOSE_C_REND_READY
Definition: circuitlist.h:83
#define CIRCUIT_PURPOSE_S_HSDIR_POST
Definition: circuitlist.h:112
#define CIRCUIT_PURPOSE_C_HSDIR_GET
Definition: circuitlist.h:90
#define CIRCUIT_PURPOSE_C_INTRODUCING
Definition: circuitlist.h:73
#define CIRCUIT_PURPOSE_S_ESTABLISH_INTRO
Definition: circuitlist.h:101
#define CIRCUIT_PURPOSE_C_ESTABLISH_REND
Definition: circuitlist.h:81
#define CIRCUIT_PURPOSE_C_GENERAL
Definition: circuitlist.h:70
#define CIRCUIT_PURPOSE_COUNTS_TOWARDS_MAXPENDING(p)
Definition: circuitlist.h:160
#define CIRCUIT_PURPOSE_HS_VANGUARDS
Definition: circuitlist.h:131
void circpad_machine_event_circ_purpose_changed(origin_circuit_t *circ)
void circpad_machine_event_circ_has_no_streams(origin_circuit_t *circ)
void circpad_machine_event_circ_has_streams(origin_circuit_t *circ)
Header file for circuitpadding.c.
int circuit_build_times_needs_circuits_now(const circuit_build_times_t *cbt)
void circuit_build_times_set_timeout(circuit_build_times_t *cbt)
double get_circuit_build_timeout_ms(void)
Definition: circuitstats.c:101
void circuit_build_times_count_timeout(circuit_build_times_t *cbt, int did_onehop)
const circuit_build_times_t * get_circuit_build_times(void)
Definition: circuitstats.c:78
double get_circuit_build_close_time_ms(void)
Definition: circuitstats.c:93
void circuit_build_times_mark_circ_as_measurement_only(origin_circuit_t *circ)
Definition: circuitstats.c:637
int circuit_build_times_enough_to_compute(const circuit_build_times_t *cbt)
Definition: circuitstats.c:255
int circuit_build_times_count_close(circuit_build_times_t *cbt, int did_onehop, time_t start_time)
int circuit_build_times_disabled(const or_options_t *options)
Definition: circuitstats.c:117
circuit_build_times_t * get_circuit_build_times_mutable(void)
Definition: circuitstats.c:85
Header file for circuitstats.c.
void circuit_build_failed(origin_circuit_t *circ)
Definition: circuituse.c:1772
void circuit_sent_valid_data(origin_circuit_t *circ, uint16_t relay_body_len)
Definition: circuituse.c:3144
void circuit_expire_old_circuits_serverside(time_t now)
Definition: circuituse.c:1564
bool circuit_is_hs_v3(const circuit_t *circ)
Definition: circuituse.c:2006
void circuit_detach_stream(circuit_t *circ, edge_connection_t *conn)
Definition: circuituse.c:1379
static int count_pending_general_client_circuits(void)
Definition: circuituse.c:387
static void circuit_testing_failed(origin_circuit_t *circ, int at_last_hop)
Definition: circuituse.c:1657
static void circuit_testing_opened(origin_circuit_t *circ)
Definition: circuituse.c:1637
static int circuit_matches_with_rend_stream(const edge_connection_t *edge_conn, const origin_circuit_t *origin_circ)
Definition: circuituse.c:81
static int circuit_try_clearing_isolation_state(origin_circuit_t *circ)
Definition: circuituse.c:1733
bool circuit_purpose_is_hs_service(const uint8_t purpose)
Definition: circuituse.c:1991
origin_circuit_t * circuit_launch(uint8_t purpose, int flags)
Definition: circuituse.c:1938
void circuit_read_valid_data(origin_circuit_t *circ, uint16_t relay_body_len)
Definition: circuituse.c:3165
void circuit_log_ancient_one_hop_circuits(int age)
Definition: circuituse.c:869
void circuit_change_purpose(circuit_t *circ, uint8_t new_purpose)
Definition: circuituse.c:3074
static int have_performed_bandwidth_test
Definition: circuituse.c:1598
void circuit_expire_waiting_for_better_guard(void)
Definition: circuituse.c:845
static int circuit_is_acceptable(const origin_circuit_t *origin_circ, const entry_connection_t *conn, int must_be_open, uint8_t purpose, int need_uptime, int need_internal, time_t now)
Definition: circuituse.c:101
void circuit_expire_old_circs_as_needed(time_t now)
Definition: circuituse.c:1348
static void circuit_predict_and_launch_new(void)
Definition: circuituse.c:1231
int circuit_should_use_vanguards(uint8_t purpose)
Definition: circuituse.c:2023
static origin_circuit_t * circuit_get_best(const entry_connection_t *conn, int must_be_open, uint8_t purpose, int need_uptime, int need_internal)
Definition: circuituse.c:331
void reset_bandwidth_test(void)
Definition: circuituse.c:1603
int hostname_in_track_host_exits(const or_options_t *options, const char *address)
Definition: circuituse.c:2677
static void consider_recording_trackhost(const entry_connection_t *conn, const origin_circuit_t *circ)
Definition: circuituse.c:2699
static int n_circuit_failures
Definition: circuituse.c:1926
#define MAX_CIRCUIT_FAILURES
Definition: circuituse.c:1933
void circuit_has_opened(origin_circuit_t *circ)
Definition: circuituse.c:1680
void circuit_expire_building(void)
Definition: circuituse.c:447
static int circuit_should_cannibalize_to_build(uint8_t purpose_to_build, int has_extend_info, int onehop_tunnel)
Definition: circuituse.c:2045
void circuit_build_needed_circs(time_t now)
Definition: circuituse.c:1325
static int did_circs_fail_last_period
Definition: circuituse.c:1929
bool circuit_purpose_is_hs_vanguards(const uint8_t purpose)
Definition: circuituse.c:1999
int connection_ap_handshake_attach_circuit(entry_connection_t *conn)
Definition: circuituse.c:2826
void circuit_reset_failure_count(int timeout)
Definition: circuituse.c:2229
#define IDLE_ONE_HOP_CIRC_TIMEOUT
Definition: circuituse.c:1557
STATIC void circuit_expire_old_circuits_clientside(void)
Definition: circuituse.c:1465
static int circuit_is_better(const origin_circuit_t *oa, const origin_circuit_t *ob, const entry_connection_t *conn)
Definition: circuituse.c:239
bool circuit_purpose_is_hs_client(const uint8_t purpose)
Definition: circuituse.c:1983
int connection_ap_handshake_attach_chosen_circuit(entry_connection_t *conn, origin_circuit_t *circ, crypt_path_t *cpath)
Definition: circuituse.c:2744
int circuit_stream_is_being_handled(entry_connection_t *conn, uint16_t port, int min)
Definition: circuituse.c:1026
static void circuit_launch_predicted_hs_circ(int flags)
Definition: circuituse.c:1212
static void circuit_increment_failure_count(void)
Definition: circuituse.c:2218
static int circuit_get_open_circ_or_launch(entry_connection_t *conn, uint8_t desired_circuit_purpose, origin_circuit_t **circp)
Definition: circuituse.c:2245
#define MAX_UNUSED_OPEN_CIRCUITS
Definition: circuituse.c:1075
void circuit_remove_handled_ports(smartlist_t *needed_ports)
Definition: circuituse.c:1001
int circuit_enough_testing_circs(void)
Definition: circuituse.c:1613
origin_circuit_t * circuit_launch_by_extend_info(uint8_t purpose, extend_info_t *extend_info, int flags)
Definition: circuituse.c:2100
static int connection_ap_get_nonrend_circ_purpose(const entry_connection_t *conn)
Definition: circuituse.c:2797
void mark_circuit_unusable_for_new_conns(origin_circuit_t *circ)
Definition: circuituse.c:3120
#define NUM_PARALLEL_TESTING_CIRCS
Definition: circuituse.c:1594
#define TESTING_CIRCUIT_INTERVAL
Definition: circuituse.c:1317
static time_t last_expired_clientside_circuits
Definition: circuituse.c:860
void circuit_try_attaching_streams(origin_circuit_t *circ)
Definition: circuituse.c:1755
static void link_apconn_to_circ(entry_connection_t *apconn, origin_circuit_t *circ, crypt_path_t *cpath)
Definition: circuituse.c:2609
static int cpath_is_on_circuit(origin_circuit_t *circ, crypt_path_t *crypt_path)
Definition: circuituse.c:2593
int circuit_purpose_is_hidden_service(uint8_t purpose)
Definition: circuituse.c:1961
Header file for circuituse.c.
#define CIRCLAUNCH_NEED_CAPACITY
Definition: circuituse.h:43
#define CIRCLAUNCH_ONEHOP_TUNNEL
Definition: circuituse.h:39
#define CIRCLAUNCH_IS_V3_RP
Definition: circuituse.h:49
#define CIRCLAUNCH_IS_INTERNAL
Definition: circuituse.h:46
#define CIRCLAUNCH_NEED_UPTIME
Definition: circuituse.h:41
#define MAX(a, b)
Definition: cmp.h:22
const or_options_t * get_options(void)
Definition: config.c:919
const char * escaped_safe_str_client(const char *address)
Definition: config.c:1110
Header file for config.c.
const char * conn_state_to_string(int type, int state)
Definition: connection.c:302
connection_t * connection_get_by_type(int type)
Definition: connection.c:4818
const char * conn_type_to_string(int type)
Definition: connection.c:268
Header file for connection.c.
#define CONN_TYPE_AP
Definition: connection.h:51
#define CONN_TYPE_DIR
Definition: connection.h:55
int connection_edge_compatible_with_circuit(const entry_connection_t *conn, const origin_circuit_t *circ)
void connection_ap_mark_as_waiting_for_renddesc(entry_connection_t *entry_conn)
void connection_ap_fail_onehop(const char *failed_digest, cpath_build_state_t *build_state)
void connection_ap_rescan_and_attach_pending(void)
int connection_ap_handshake_send_begin(entry_connection_t *ap_conn)
void circuit_clear_isolation(origin_circuit_t *circ)
entry_connection_t * EDGE_TO_ENTRY_CONN(edge_connection_t *c)
int connection_ap_handshake_send_resolve(entry_connection_t *ap_conn)
int connection_edge_update_circuit_isolation(const entry_connection_t *conn, origin_circuit_t *circ, int dry_run)
int connection_ap_can_use_exit(const entry_connection_t *conn, const node_t *exit_node)
void connection_ap_attach_pending(int retry)
int connection_edge_is_rendezvous_stream(const edge_connection_t *conn)
void circuit_discard_optional_exit_enclaves(extend_info_t *info)
Header file for connection_edge.c.
#define AP_CONN_STATE_CONTROLLER_WAIT
#define AP_CONN_STATE_CIRCUIT_WAIT
int control_event_circuit_purpose_changed(origin_circuit_t *circ, int old_purpose)
int control_event_circuit_cannibalized(origin_circuit_t *circ, int old_purpose, const struct timeval *old_tv_created)
Header file for control_events.c.
Circuit-build-stse structure.
#define HEX_DIGEST_LEN
Definition: crypto_digest.h:35
int ed25519_pubkey_eq(const ed25519_public_key_t *key1, const ed25519_public_key_t *key2)
const char * extend_info_describe(const extend_info_t *ei)
Definition: describe.c:224
const char * node_describe(const node_t *node)
Definition: describe.c:160
Header file for describe.c.
#define tor_memneq(a, b, sz)
Definition: di_ops.h:21
#define DIGEST_LEN
Definition: digest_sizes.h:20
Client/server directory connection structure.
dir_connection_t * TO_DIR_CONN(connection_t *c)
Definition: directory.c:88
Header file for directory.c.
#define DIR_PURPOSE_UPLOAD_HSDESC
Definition: directory.h:67
#define DIR_PURPOSE_FETCH_CONSENSUS
Definition: directory.h:54
#define DIR_PURPOSE_FETCH_HSDESC
Definition: directory.h:69
Entry connection structure.
#define ENTRY_TO_EDGE_CONN(c)
void entry_guard_failed(circuit_guard_state_t **guard_state_p)
Definition: entrynodes.c:2534
int entry_list_is_constrained(const or_options_t *options)
Definition: entrynodes.c:3392
int entry_guard_state_should_expire(circuit_guard_state_t *guard_state)
Definition: entrynodes.c:2802
int guards_retry_optimistic(const or_options_t *options)
Definition: entrynodes.c:3839
Header file for circuitbuild.c.
const char * escaped(const char *s)
Definition: escape.c:126
Header file for Tor tracing instrumentation definition.
#define TR_SUBSYS(name)
Definition: events.h:45
Extend-info structure.
extend_info_t * extend_info_from_node(const node_t *node, int for_direct_connect)
Definition: extendinfo.c:92
extend_info_t * extend_info_new(const char *nickname, const char *rsa_id_digest, const ed25519_public_key_t *ed_id, crypto_pk_t *onion_key, const curve25519_public_key_t *ntor_key, const tor_addr_t *addr, uint16_t port)
Definition: extendinfo.c:33
bool extend_info_has_orport(const extend_info_t *ei, const tor_addr_t *addr, uint16_t port)
Definition: extendinfo.c:243
Header for core/or/extendinfo.c.
Header for fp.c.
void hs_circ_cleanup_on_repurpose(circuit_t *circ)
Definition: hs_circuit.c:1245
void hs_circ_retry_service_rendezvous_point(origin_circuit_t *circ)
Definition: hs_circuit.c:633
bool hs_circ_is_rend_sent_in_intro1(const origin_circuit_t *circ)
Definition: hs_circuit.c:1267
Header file containing circuit data for the whole HS subsystem.
void hs_client_note_connection_attempt_succeeded(const edge_connection_t *conn)
Definition: hs_client.c:1939
int hs_client_refetch_hsdesc(const ed25519_public_key_t *identity_pk)
Definition: hs_client.c:2037
int hs_client_send_introduce1(origin_circuit_t *intro_circ, origin_circuit_t *rend_circ)
Definition: hs_client.c:2068
void hs_client_circuit_has_opened(origin_circuit_t *circ)
Definition: hs_client.c:2078
extend_info_t * hs_client_get_random_intro_from_edge(const edge_connection_t *edge_conn)
Definition: hs_client.c:2400
Header file containing client data for the HS subsystem.
void hs_dec_rdv_stream_counter(origin_circuit_t *circ)
Definition: hs_common.c:1722
Header file containing common data for the whole HS subsystem.
hs_ident_circuit_t * hs_ident_circuit_new(const ed25519_public_key_t *identity_pk)
Definition: hs_ident.c:16
Header file containing circuit and connection identifier data for the whole HS subsystem.
void hs_service_circuit_has_opened(origin_circuit_t *circ)
Definition: hs_service.c:4127
unsigned int hs_service_get_num_services(void)
Definition: hs_service.c:3918
void hs_stats_note_service_rendezvous_launch(void)
Definition: hs_stats.c:34
Header file for hs_stats.c.
int tor_inet_aton(const char *str, struct in_addr *addr)
Definition: inaddr.c:40
#define log_fn(severity, domain, args,...)
Definition: log.h:283
#define LD_REND
Definition: log.h:84
#define log_fn_ratelim(ratelim, severity, domain, args,...)
Definition: log.h:288
#define LD_APP
Definition: log.h:78
#define LOG_DEBUG
Definition: log.h:42
#define LD_OR
Definition: log.h:92
#define LD_HEARTBEAT
Definition: log.h:103
#define LD_BUG
Definition: log.h:86
#define LD_GENERAL
Definition: log.h:62
#define LD_DIR
Definition: log.h:88
#define LOG_NOTICE
Definition: log.h:50
#define LD_CIRC
Definition: log.h:82
#define LOG_WARN
Definition: log.h:53
#define LOG_INFO
Definition: log.h:45
#define tor_free(p)
Definition: malloc.h:52
int32_t networkstatus_get_param(const networkstatus_t *ns, const char *param_name, int32_t default_val, int32_t min_val, int32_t max_val)
Header file for networkstatus.c.
int node_has_preferred_descriptor(const node_t *node, int for_direct_connect)
Definition: nodelist.c:1500
int router_exit_policy_all_nodes_reject(const tor_addr_t *addr, uint16_t port, int need_uptime)
Definition: nodelist.c:2350
const node_t * node_get_by_nickname(const char *nickname, unsigned flags)
Definition: nodelist.c:1085
consensus_path_type_t router_have_consensus_path(void)
Definition: nodelist.c:2460
const node_t * node_get_by_id(const char *identity_digest)
Definition: nodelist.c:226
int router_have_minimum_dir_info(void)
Definition: nodelist.c:2427
Header file for nodelist.c.
Master header file for Tor-specific functionality.
#define MIN_CIRCUITS_HANDLING_STREAM
Definition: or.h:180
@ ADDRMAPSRC_TRACKEXIT
Definition: or.h:926
#define TO_CIRCUIT(x)
Definition: or.h:845
#define RELAY_PAYLOAD_SIZE
Definition: or.h:486
#define ISO_SOCKSAUTH
Definition: or.h:858
#define END_CIRC_REASON_MEASUREMENT_EXPIRED
Definition: or.h:301
#define TO_CONN(c)
Definition: or.h:616
#define END_CIRC_AT_ORIGIN
Definition: or.h:306
#define ENTRY_TO_CONN(c)
Definition: or.h:619
Origin circuit structure.
@ PATH_STATE_USE_FAILED
@ PATH_STATE_BUILD_SUCCEEDED
addr_policy_result_t compare_tor_addr_to_addr_policy(const tor_addr_t *addr, uint16_t port, const smartlist_t *policy)
Definition: policies.c:1516
addr_policy_result_t compare_tor_addr_to_node_policy(const tor_addr_t *addr, uint16_t port, const node_t *node)
Definition: policies.c:2887
Header file for policies.c.
addr_policy_result_t
Definition: policies.h:38
@ ADDR_POLICY_PROBABLY_REJECTED
Definition: policies.h:48
@ ADDR_POLICY_REJECTED
Definition: policies.h:42
void rep_hist_note_used_internal(time_t now, int need_uptime, int need_capacity)
int rep_hist_get_predicted_internal(time_t now, int *need_uptime, int *need_capacity)
Header file for predict_ports.c.
int tor_asprintf(char **strp, const char *fmt,...)
Definition: printf.c:75
int proxy_mode(const or_options_t *options)
Definition: proxymode.c:21
Header file for proxymode.c.
char * rate_limit_log(ratelim_t *lim, time_t now)
Definition: ratelim.c:42
void routerlist_retry_directory_downloads(time_t now)
Definition: routerlist.c:2315
int hexdigest_to_digest(const char *hexdigest, char *digest)
Definition: routerlist.c:749
Header file for routerlist.c.
int server_mode(const or_options_t *options)
Definition: routermode.c:34
Header file for routermode.c.
int routerset_contains_extendinfo(const routerset_t *set, const extend_info_t *ei)
Definition: routerset.c:308
int router_orport_seems_reachable(const or_options_t *options, int family)
Definition: selftest.c:101
void router_do_reachability_checks(void)
Definition: selftest.c:284
void router_perform_bandwidth_test(int num_circs, time_t now)
Definition: selftest.c:417
Header file for selftest.c.
int smartlist_contains_int_as_string(const smartlist_t *sl, int num)
Definition: smartlist.c:147
smartlist_t * smartlist_new(void)
void smartlist_add(smartlist_t *sl, void *element)
void smartlist_del(smartlist_t *sl, int idx)
#define SMARTLIST_FOREACH_BEGIN(sl, type, var)
Client request structure.
#define SOCKS_COMMAND_CONNECT
unsigned int is_bad_for_new_circs
Definition: channel.h:419
uint8_t state
Definition: circuit_st.h:110
time_t timestamp_dirty
Definition: circuit_st.h:187
unsigned int received_destroy
Definition: circuit_st.h:104
uint16_t marked_for_close
Definition: circuit_st.h:189
uint8_t purpose
Definition: circuit_st.h:111
struct timeval timestamp_began
Definition: circuit_st.h:165
int package_window
Definition: circuit_st.h:116
struct timeval timestamp_created
Definition: circuit_st.h:168
channel_t * n_chan
Definition: circuit_st.h:69
circid_t n_circ_id
Definition: circuit_st.h:78
uint8_t state
Definition: connection_st.h:49
struct connection_t * linked_conn
unsigned int hold_open_until_flushed
Definition: connection_st.h:61
unsigned int reading_from_linked_conn
Definition: connection_st.h:81
unsigned int type
Definition: connection_st.h:50
unsigned int linked
Definition: connection_st.h:78
uint16_t marked_for_close
uint16_t port
const char * marked_for_close_file
unsigned int purpose
Definition: connection_st.h:51
time_t timestamp_created
tor_addr_t addr
extend_info_t * chosen_exit
struct crypt_path_t * prev
Definition: crypt_path_st.h:75
uint8_t state
Definition: crypt_path_st.h:68
struct crypt_path_t * next
Definition: crypt_path_st.h:72
extend_info_t * extend_info
Definition: crypt_path_st.h:61
struct crypt_path_t * cpath_layer
struct edge_connection_t * next_stream
unsigned int edge_has_sent_end
unsigned int edge_blocked_on_circ
struct circuit_t * on_circuit
socks_request_t * socks_request
unsigned int num_circuits_launched
unsigned int chosen_exit_optional
unsigned int may_use_optimistic_data
unsigned int socks_iso_keep_alive
char identity_digest[DIGEST_LEN]
ed25519_public_key_t identity_pk
Definition: hs_ident.h:45
ed25519_public_key_t identity_pk
Definition: hs_ident.h:106
Definition: node_st.h:34
edge_connection_t * resolving_streams
Definition: or_circuit_st.h:42
channel_t * p_chan
Definition: or_circuit_st.h:37
circid_t p_circ_id
Definition: or_circuit_st.h:33
struct or_circuit_t * rend_splice
Definition: or_circuit_st.h:50
edge_connection_t * n_streams
Definition: or_circuit_st.h:39
int TrackHostExitsExpire
int MaxCircuitDirtiness
struct routerset_t * ExcludeExitNodes
struct smartlist_t * TrackHostExits
struct routerset_t * EntryNodes
struct routerset_t * ExcludeNodes
int MaxClientCircuitsPending
struct routerset_t * HSLayer2Nodes
int DisablePredictedCircuits
struct smartlist_t * LongLivedPorts
struct routerset_t * HSLayer3Nodes
unsigned int relaxed_timeout
struct hs_ident_circuit_t * hs_ident
edge_connection_t * p_streams
unsigned int isolation_values_set
uint32_t n_overhead_written_circ_bw
unsigned int has_opened
path_state_bitfield_t path_state
unsigned int is_ancient
uint32_t n_delivered_read_circ_bw
uint32_t n_delivered_written_circ_bw
uint32_t n_overhead_read_circ_bw
smartlist_t * prepend_policy
crypt_path_t * cpath
cpath_build_state_t * build_state
unsigned int isolation_any_streams_attached
struct circuit_guard_state_t * guard_state
unsigned int hs_circ_has_timed_out
char address[MAX_SOCKS_ADDR_LEN]
#define STATIC
Definition: testsupport.h:32
void format_local_iso_time(char *buf, time_t t)
Definition: time_fmt.c:285
#define timercmp(tv1, tv2, op)
Definition: timeval.h:81
void tor_gettimeofday(struct timeval *timeval)
long tv_mdiff(const struct timeval *start, const struct timeval *end)
Definition: tvdiff.c:102
Header for tvdiff.c.
#define tor_assert(expr)
Definition: util_bug.h:102
#define tor_fragile_assert()
Definition: util_bug.h:270
int strcasecmpend(const char *s1, const char *s2)
Definition: util_string.c:264
int tor_digest_is_zero(const char *digest)
Definition: util_string.c:96