GNUnet  0.11.x
gnunet-service-cadet_connection.c
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1 /*
2  This file is part of GNUnet.
3  Copyright (C) 2001-2017 GNUnet e.V.
4 
5  GNUnet is free software: you can redistribute it and/or modify it
6  under the terms of the GNU Affero General Public License as published
7  by the Free Software Foundation, either version 3 of the License,
8  or (at your option) any later version.
9 
10  GNUnet is distributed in the hope that it will be useful, but
11  WITHOUT ANY WARRANTY; without even the implied warranty of
12  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13  Affero General Public License for more details.
14 
15  You should have received a copy of the GNU Affero General Public License
16  along with this program. If not, see <http://www.gnu.org/licenses/>.
17 
18  SPDX-License-Identifier: AGPL3.0-or-later
19  */
20 
28 #include "platform.h"
33 #include "gnunet_cadet_service.h"
35 #include "cadet_protocol.h"
36 
37 
38 #define LOG(level, ...) GNUNET_log_from (level, "cadet-con", __VA_ARGS__)
39 
40 
45 #define INITIAL_CONNECTION_CREATE_RETRY_DELAY \
46  GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS, 200)
47 
48 
53 {
58 
63 
68 
74 
79 };
80 
81 
86 {
91 
96 
101 
106 
111 
116 
121 
126 
131 
136 
141 
146 
151 
156 
161 
165  unsigned int latency_datapoints;
166 
170  unsigned int off;
171 
176 };
177 
178 
185 struct CadetConnection *
187 {
189  &cid->connection_of_tunnel);
190 }
191 
192 
201 static void
203  enum CadetConnectionState new_state,
204  int new_mqm_ready)
205 {
206  int old_ready;
207  int new_ready;
208 
209  if ((new_state == cc->state) && (new_mqm_ready == cc->mqm_ready))
210  return; /* no change, nothing to do */
211  old_ready =
212  ((CADET_CONNECTION_READY == cc->state) && (GNUNET_YES == cc->mqm_ready));
213  new_ready =
214  ((CADET_CONNECTION_READY == new_state) && (GNUNET_YES == new_mqm_ready));
215  cc->state = new_state;
216  cc->mqm_ready = new_mqm_ready;
217  if (old_ready != new_ready)
218  cc->ready_cb (cc->ready_cb_cls, new_ready);
219 }
220 
221 
228 static void
230 {
231  LOG (GNUNET_ERROR_TYPE_DEBUG, "Destroying %s\n", GCC_2s (cc));
232  if (NULL != cc->mq_man)
233  {
234  GCP_request_mq_cancel (cc->mq_man, NULL);
235  cc->mq_man = NULL;
236  }
237  if (NULL != cc->task)
238  {
240  cc->task = NULL;
241  }
242  if (NULL != cc->keepalive_qe)
243  {
245  cc->keepalive_qe = NULL;
246  }
247  GCPP_del_connection (cc->path, cc->off, cc);
248  for (unsigned int i = 0; i < cc->off; i++)
250  GNUNET_assert (
251  GNUNET_YES ==
253  &GCC_get_id (cc)
254  ->connection_of_tunnel,
255  cc));
256  GNUNET_free (cc);
257 }
258 
259 
268 void
270 {
271  if (NULL != cc->ct)
272  {
273  GCT_connection_lost (cc->ct);
274  cc->ct = NULL;
275  }
276  GCC_destroy (cc);
277 }
278 
279 
287 void
289 {
290  cc->ct = NULL;
291  if ((CADET_CONNECTION_SENDING_CREATE != cc->state) && (NULL != cc->mq_man))
292  {
293  struct GNUNET_MQ_Envelope *env;
294  struct GNUNET_CADET_ConnectionDestroyMessage *destroy_msg;
295 
296  /* Need to notify next hop that we are down. */
297  env =
299  destroy_msg->cid = cc->cid;
300  GCP_request_mq_cancel (cc->mq_man, env);
301  cc->mq_man = NULL;
302  }
303  GCC_destroy (cc);
304 }
305 
306 
313 struct CadetTConnection *
315 {
316  return cc->ct;
317 }
318 
319 
326 const struct CadetConnectionMetrics *
328 {
329  return &cc->metrics;
330 }
331 
332 
339 static void
340 send_keepalive (void *cls);
341 
342 
351 static void
352 keepalive_done (void *cls,
354 {
355  struct CadetConnection *cc = cls;
356 
357  cc->keepalive_qe = NULL;
358  if ((GNUNET_YES == cc->mqm_ready) && (NULL == cc->task))
359  cc->task =
361 }
362 
363 
370 static void
371 send_keepalive (void *cls)
372 {
373  struct CadetConnection *cc = cls;
374  struct GNUNET_MessageHeader msg;
375 
376  cc->task = NULL;
377  if (CADET_TUNNEL_KEY_OK != GCT_get_estate (cc->ct->t))
378  {
379  /* Tunnel not yet ready, wait with keepalives... */
380  cc->task =
382  return;
383  }
384  GNUNET_assert (NULL != cc->ct);
386  GNUNET_assert (NULL == cc->keepalive_qe);
388  "Sending KEEPALIVE on behalf of %s via %s\n",
389  GCC_2s (cc),
390  GCT_2s (cc->ct->t));
391  GNUNET_STATISTICS_update (stats, "# keepalives sent", 1, GNUNET_NO);
392  msg.size = htons (sizeof(msg));
394 
395  cc->keepalive_qe = GCT_send (cc->ct->t, &msg, &keepalive_done, cc);
396 }
397 
398 
405 void
407 {
408  struct CadetConnection *cc;
409 
410  cc = GCC_lookup (cid);
411  if (NULL == cc)
412  return; /* whopise, connection alredy down? */
414 }
415 
416 
425 void
427 {
428  struct CadetConnection *cc;
429 
430  cc = GCC_lookup (cid);
431  if (NULL == cc)
432  return; /* whopise, connection alredy down? */
433  cc->metrics.num_successes++;
434 }
435 
436 
445 void
447  struct GNUNET_TIME_Relative latency)
448 {
449  struct CadetConnection *cc;
450  double weight;
451  double result;
452 
453  cc = GCC_lookup (cid);
454  if (NULL == cc)
455  return; /* whopise, connection alredy down? */
456  GNUNET_STATISTICS_update (stats, "# latencies observed", 1, GNUNET_NO);
457  cc->latency_datapoints++;
458  if (cc->latency_datapoints >= 7)
459  weight = 7.0;
460  else
461  weight = cc->latency_datapoints;
462  /* Compute weighted average, giving at MOST weight 7 to the
463  existing values, or less if that value is based on fewer than 7
464  measurements. */
465  result = (weight * cc->metrics.aged_latency.rel_value_us)
466  + 1.0 * latency.rel_value_us;
467  result /= (weight + 1.0);
468  cc->metrics.aged_latency.rel_value_us = (uint64_t) result;
469 }
470 
471 
479 void
481 {
483  "Received CADET_CONNECTION_CREATE_ACK for %s in state %d (%s)\n",
484  GCC_2s (cc),
485  cc->state,
486  (GNUNET_YES == cc->mqm_ready) ? "MQM ready" : "MQM busy");
487  if (CADET_CONNECTION_READY == cc->state)
488  return; /* Duplicate ACK, ignore */
489  if (NULL != cc->task)
490  {
492  cc->task = NULL;
493  }
496  if ((NULL == cc->keepalive_qe) && (GNUNET_YES == cc->mqm_ready) &&
497  (NULL == cc->task))
498  cc->task =
500 }
501 
502 
509 void
512 {
514  "Received KX message with ephermal %s on CC %s in state %d\n",
515  GNUNET_e2s (&msg->ephemeral_key),
517  cc->state);
518  if (CADET_CONNECTION_SENT == cc->state)
519  {
520  /* We didn't get the CADET_CONNECTION_CREATE_ACK, but instead got payload. That's fine,
521  clearly something is working, so pretend we got an ACK. */
523  "Faking connection CADET_CONNECTION_CREATE_ACK for %s due to KX\n",
524  GCC_2s (cc));
526  }
527  GCT_handle_kx (cc->ct, msg);
528 }
529 
530 
537 void
540 {
542  "Received KX AUTH message with ephermal %s on CC %s in state %d\n",
543  GNUNET_e2s (&msg->kx.ephemeral_key),
545  cc->state);
546  if (CADET_CONNECTION_SENT == cc->state)
547  {
548  /* We didn't get the CADET_CONNECTION_CREATE_ACK, but instead got payload. That's fine,
549  clearly something is working, so pretend we got an ACK. */
551  "Faking connection CADET_CONNECTION_CREATE_ACK for %s due to KX\n",
552  GCC_2s (cc));
554  }
555  GCT_handle_kx_auth (cc->ct, msg);
556 }
557 
558 
565 void
568 {
569  if (CADET_CONNECTION_SENT == cc->state)
570  {
571  /* We didn't get the CREATE_ACK, but instead got payload. That's fine,
572  clearly something is working, so pretend we got an ACK. */
574  "Faking connection ACK for %s due to ENCRYPTED payload\n",
575  GCC_2s (cc));
577  }
579  GCT_handle_encrypted (cc->ct, msg);
580 }
581 
582 
589 static void
590 send_create (void *cls)
591 {
592  struct CadetConnection *cc = cls;
593  struct GNUNET_CADET_ConnectionCreateMessage *create_msg;
594  struct GNUNET_PeerIdentity *pids;
595  struct GNUNET_MQ_Envelope *env;
596 
597  cc->task = NULL;
599  env =
600  GNUNET_MQ_msg_extra (create_msg,
601  (2 + cc->off) * sizeof(struct GNUNET_PeerIdentity),
603  // TODO This will be removed in a major release, because this will be a protocol breaking change. We set the deprecated 'reliable' bit here that was removed.
604  create_msg->options = 2;
605  create_msg->cid = cc->cid;
606  pids = (struct GNUNET_PeerIdentity *) &create_msg[1];
607  pids[0] = my_full_id;
608  for (unsigned int i = 0; i <= cc->off; i++)
609  pids[i + 1] = *GCP_get_id (GCPP_get_peer_at_offset (cc->path, i));
611  "Sending CADET_CONNECTION_CREATE message for %s with %u hops\n",
612  GCC_2s (cc),
613  cc->off + 2);
614  cc->env = env;
618  GCP_send (cc->mq_man, env);
619 }
620 
621 
627 static void
628 send_create_ack (void *cls)
629 {
630  struct CadetConnection *cc = cls;
632  struct GNUNET_MQ_Envelope *env;
633 
634  cc->task = NULL;
636  "Sending CONNECTION_CREATE_ACK message for %s\n",
637  GCC_2s (cc));
639  env =
641  ack_msg->cid = cc->cid;
642  cc->env = env;
647  if (CADET_CONNECTION_READY == cc->state)
648  cc->task =
650  GCP_send (cc->mq_man, env);
651 }
652 
653 
661 void
663 {
664  if (GNUNET_YES == cc->mqm_ready)
665  {
667  "Got duplicate CREATE for %s, scheduling another ACK (%s)\n",
668  GCC_2s (cc),
669  (GNUNET_YES == cc->mqm_ready) ? "MQM ready" : "MQM busy");
670  /* Revert back to the state of having only received the 'CREATE',
671  and immediately proceed to send the CREATE_ACK. */
673  if (NULL != cc->task)
675  cc->task =
677  }
678  else
679  {
680  /* We are currently sending something else back, which
681  can only be an ACK or payload, either of which would
682  do. So actually no need to do anything. */
684  "Got duplicate CREATE for %s. MQ is busy, not queueing another ACK\n",
685  GCC_2s (cc));
686  }
687 }
688 
689 
700 static void
701 manage_first_hop_mq (void *cls, int available)
702 {
703  struct CadetConnection *cc = cls;
704 
705  if (GNUNET_YES != available)
706  {
707  /* Connection is down, for now... */
708  LOG (GNUNET_ERROR_TYPE_DEBUG, "Core MQ for %s went down\n", GCC_2s (cc));
711  if (NULL != cc->task)
712  {
714  cc->task = NULL;
715  }
716  return;
717  }
718 
719  update_state (cc, cc->state, GNUNET_YES);
721  "Core MQ for %s became available in state %d\n",
722  GCC_2s (cc),
723  cc->state);
724  switch (cc->state)
725  {
727  /* Transmit immediately */
729  break;
730 
732  /* Should not be possible to be called in this state. */
733  GNUNET_assert (0);
734  break;
735 
737  /* Retry a bit later... */
739  break;
740 
742  /* We got the 'CREATE' (incoming connection), should send the CREATE_ACK */
744  cc->task =
746  break;
747 
749  if ((NULL == cc->keepalive_qe) && (GNUNET_YES == cc->mqm_ready) &&
750  (NULL == cc->task))
751  {
753  "Scheduling keepalive for %s in %s\n",
754  GCC_2s (cc),
756  GNUNET_YES));
757  cc->task =
759  }
760  break;
761  }
762 }
763 
764 
779 static struct CadetConnection *
781  struct CadetPeerPath *path,
782  unsigned int off,
783  struct CadetTConnection *ct,
785  enum CadetConnectionState init_state,
787  void *ready_cb_cls)
788 {
789  struct CadetConnection *cc;
790  struct CadetPeer *first_hop;
791 
792  cc = GNUNET_new (struct CadetConnection);
793  cc->state = init_state;
794  cc->ct = ct;
795  cc->cid = *cid;
796  cc->retry_delay =
800  connections,
801  &GCC_get_id (cc)->connection_of_tunnel,
802  cc,
804  cc->ready_cb = ready_cb;
806  cc->path = path;
807  cc->off = off;
809  "Creating %s using path %s (offset: %u)\n",
810  GCC_2s (cc),
811  GCPP_2s (path),
812  off);
813  GCPP_add_connection (path, off, cc);
814  for (unsigned int i = 0; i < off; i++)
816  first_hop = GCPP_get_peer_at_offset (path, 0);
817  cc->mq_man = GCP_request_mq (first_hop, &manage_first_hop_mq, cc);
818  return cc;
819 }
820 
821 
835 struct CadetConnection *
837  struct CadetPeerPath *path,
838  struct CadetTConnection *ct,
841  void *ready_cb_cls)
842 {
843  struct CadetConnection *cc;
844  unsigned int off;
845 
846  off = GCPP_find_peer (path, destination);
847  GNUNET_assert (UINT_MAX != off);
848  cc = GCPP_get_connection (path, destination, off);
849  if (NULL != cc)
850  {
851  int cmp;
852 
853  cmp = GNUNET_memcmp (cid, &cc->cid);
854  if (0 == cmp)
855  {
856  /* Two peers picked the SAME random connection identifier at the
857  same time for the same path? Must be malicious. Drop
858  connection (existing and inbound), even if it is the only
859  one. */
860  GNUNET_break_op (0);
861  GCT_connection_lost (cc->ct);
863  return NULL;
864  }
865  if (0 < cmp)
866  {
867  /* drop existing */
869  "Got two connections on %s, dropping my existing %s\n",
870  GCPP_2s (path),
871  GCC_2s (cc));
872  GCT_connection_lost (cc->ct);
874  }
875  else
876  {
877  /* keep existing */
879  "Got two connections on %s, keeping my existing %s\n",
880  GCPP_2s (path),
881  GCC_2s (cc));
882  return NULL;
883  }
884  }
885 
886  return connection_create (destination,
887  path,
888  off,
889  ct,
890  cid,
892  ready_cb,
893  ready_cb_cls);
894 }
895 
896 
909 struct CadetConnection *
911  struct CadetPeerPath *path,
912  unsigned int off,
913  struct CadetTConnection *ct,
915  void *ready_cb_cls)
916 {
918 
920  return connection_create (destination,
921  path,
922  off,
923  ct,
924  &cid,
926  ready_cb,
927  ready_cb_cls);
928 }
929 
930 
941 void
943 {
945  "Scheduling message for transmission on %s\n",
946  GCC_2s (cc));
950  cc->mqm_ready = GNUNET_NO;
951  if (NULL != cc->task)
952  {
954  cc->task = NULL;
955  }
956  GCP_send (cc->mq_man, env);
957 }
958 
959 
967 struct CadetPeerPath *
968 GCC_get_path (struct CadetConnection *cc, unsigned int *off)
969 {
970  *off = cc->off;
971  return cc->path;
972 }
973 
974 
983 {
984  return &cc->cid;
985 }
986 
987 
993 const char *
994 GCC_2s (const struct CadetConnection *cc)
995 {
996  static char buf[128];
997 
998  if (NULL == cc)
999  return "Connection(NULL)";
1000 
1001  if (NULL != cc->ct)
1002  {
1003  GNUNET_snprintf (buf,
1004  sizeof(buf),
1005  "Connection %s (%s)",
1007  GCT_2s (cc->ct->t));
1008  return buf;
1009  }
1010  GNUNET_snprintf (buf,
1011  sizeof(buf),
1012  "Connection %s",
1014  return buf;
1015 }
1016 
1017 
1018 #define LOG2(level, ...) \
1019  GNUNET_log_from_nocheck (level, "cadet-con", __VA_ARGS__)
1020 
1021 
1028 void
1030 {
1031 #if ! defined(GNUNET_CULL_LOGGING)
1032  int do_log;
1033 
1035  "cadet-con",
1036  __FILE__,
1037  __FUNCTION__,
1038  __LINE__);
1039  if (0 == do_log)
1040  return;
1041  if (NULL == cc)
1042  {
1043  LOG2 (level, "Connection (NULL)\n");
1044  return;
1045  }
1046  LOG2 (level,
1047  "%s to %s via path %s in state %d is %s\n",
1048  GCC_2s (cc),
1049  GCP_2s (cc->destination),
1050  GCPP_2s (cc->path),
1051  cc->state,
1052  (GNUNET_YES == cc->mqm_ready) ? "ready" : "busy");
1053 #endif
1054 }
1055 
1056 
1057 /* end of gnunet-service-cadet_connection.c */
int mqm_ready
Are we ready to transmit via mq_man right now?
Axolotl-encrypted tunnel message with application payload.
#define INITIAL_CONNECTION_CREATE_RETRY_DELAY
How long do we wait initially before retransmitting the KX? TODO: replace by 2 RTT if/once we have co...
void GCT_connection_lost(struct CadetTConnection *ct)
We lost a connection, remove it from our list and clean up the connection object itself.
struct GNUNET_TIME_Absolute create_ack_at
Earliest time for re-trying CREATE_ACK.
const char * GNUNET_sh2s(const struct GNUNET_ShortHashCode *shc)
Convert a short hash value to a string (for printing debug messages).
const struct CadetConnectionMetrics * GCC_get_metrics(struct CadetConnection *cc)
Obtain performance metrics from cc.
Peer description.
struct GNUNET_MessageHeader * msg
Definition: 005.c:2
struct GNUNET_SCHEDULER_Task * task
Task for connection maintenance.
GNUnet CADET service with encryption.
Low-level connection to a destination.
uint64_t rel_value_us
The actual value.
static void send_keepalive(void *cls)
Send a GNUNET_MESSAGE_TYPE_CADET_CHANNEL_KEEPALIVE through the tunnel to prevent it from timing out...
Message to destroy a connection.
enum CadetTunnelEState GCT_get_estate(struct CadetTunnel *t)
Get the encryption state of a tunnel.
A connection is a live end-to-end messaging mechanism where the peers are identified by a path and kn...
static void send_create_ack(void *cls)
Send a CREATE_ACK message towards the origin.
const char * GCT_2s(const struct CadetTunnel *t)
Get the static string for the peer this tunnel is directed.
unsigned long long num_successes
Number of packets that were sent via this connection did actually receive an ACK? (Note: ACKs may be ...
int GNUNET_snprintf(char *buf, size_t size, const char *format,...)
Like snprintf, just aborts if the buffer is of insufficient size.
void GCT_handle_encrypted(struct CadetTConnection *ct, const struct GNUNET_CADET_TunnelEncryptedMessage *msg)
Handle encrypted message.
const char * GCC_2s(const struct CadetConnection *cc)
Get a (static) string for a connection.
CadetConnectionState
All the states a connection can be in.
Data structure used to track whom we have to notify about changes to our message queue.
struct GNUNET_TIME_Absolute last_use
When was this connection last used? (by us sending or receiving a PAYLOAD message on it) ...
struct GNUNET_CADET_TunnelKeyExchangeMessage kx
Message header with key material.
struct GNUNET_PeerIdentity my_full_id
Local peer own ID.
static void update_state(struct CadetConnection *cc, enum CadetConnectionState new_state, int new_mqm_ready)
Update the connection state.
struct GNUNET_TIME_Absolute GNUNET_TIME_relative_to_absolute(struct GNUNET_TIME_Relative rel)
Convert relative time to an absolute time in the future.
Definition: time.c:246
void GCC_destroy_without_core(struct CadetConnection *cc)
Destroy a connection, called when the CORE layer is already done (i.e.
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
struct CadetTunnelQueueEntry * GCT_send(struct CadetTunnel *t, const struct GNUNET_MessageHeader *message, GCT_SendContinuation cont, void *cont_cls)
Sends an already built message on a tunnel, encrypting it and choosing the best connection if not pro...
Message for ack&#39;ing a connection.
void GCT_send_cancel(struct CadetTunnelQueueEntry *tq)
Cancel a previously sent message while it&#39;s in the queue.
const struct GNUNET_CADET_ConnectionTunnelIdentifier * GCC_get_id(struct CadetConnection *cc)
Obtain unique ID for the connection.
struct CadetPeerPath * path
Path we are using to our destination.
We are an inbound connection, and received a CREATE.
struct GNUNET_CADET_ConnectionTunnelIdentifier cid
ID of the connection.
void GCC_handle_kx(struct CadetConnection *cc, const struct GNUNET_CADET_TunnelKeyExchangeMessage *msg)
Handle KX message.
struct CadetPeer * destination
To which peer does this connection go?
int GNUNET_CONTAINER_multishortmap_remove(struct GNUNET_CONTAINER_MultiShortmap *map, const struct GNUNET_ShortHashCode *key, const void *value)
Remove the given key-value pair from the map.
static struct CadetConnection * connection_create(struct CadetPeer *destination, struct CadetPeerPath *path, unsigned int off, struct CadetTConnection *ct, const struct GNUNET_CADET_ConnectionTunnelIdentifier *cid, enum CadetConnectionState init_state, GCC_ReadyCallback ready_cb, void *ready_cb_cls)
Create a connection to destination via path and notify cb whenever we are ready for more data...
#define GNUNET_MQ_msg(mvar, type)
Allocate a GNUNET_MQ_Envelope.
Definition: gnunet_mq_lib.h:67
void GCC_handle_connection_create_ack(struct CadetConnection *cc)
A GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE_ACK was received for this connection, implying that the end-to-end connection is up.
#define GNUNET_NO
Definition: gnunet_common.h:78
static void send_create(void *cls)
Send a GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE message to the first hop.
#define GNUNET_OK
Named constants for return values.
Definition: gnunet_common.h:75
static void GCC_destroy(struct CadetConnection *cc)
Destroy a connection, part of the internal implementation.
Information we track per tunnel.
GNUNET_ErrorType
Types of errors.
#define GNUNET_new(type)
Allocate a struct or union of the given type.
void GCP_send(struct GCP_MessageQueueManager *mqm, struct GNUNET_MQ_Envelope *env)
Send the message in env to cp.
struct CadetConnection * GCC_create(struct CadetPeer *destination, struct CadetPeerPath *path, unsigned int off, struct CadetTConnection *ct, GCC_ReadyCallback ready_cb, void *ready_cb_cls)
Create a connection to destination via path and notify cb whenever we are ready for more data...
struct GNUNET_TIME_Absolute create_at
Earliest time for re-trying CREATE.
uint16_t size
The length of the struct (in bytes, including the length field itself), in big-endian format...
GCC_ReadyCallback ready_cb
Function to call once we are ready to transmit.
struct CadetConnection * GCC_create_inbound(struct CadetPeer *destination, struct CadetPeerPath *path, struct CadetTConnection *ct, const struct GNUNET_CADET_ConnectionTunnelIdentifier *cid, GCC_ReadyCallback ready_cb, void *ready_cb_cls)
Create a connection to destination via path and notify cb whenever we are ready for more data...
void GNUNET_STATISTICS_update(struct GNUNET_STATISTICS_Handle *handle, const char *name, int64_t delta, int make_persistent)
Set statistic value for the peer.
struct GNUNET_CONTAINER_MultiShortmap * connections
Map from struct GNUNET_CADET_ConnectionTunnelIdentifier hash codes to struct CadetConnection objects...
void GCC_debug(struct CadetConnection *cc, enum GNUNET_ErrorType level)
Log connection info.
#define LOG2(level,...)
const char * GCP_2s(const struct CadetPeer *cp)
Get the static string for a peer ID.
struct CadetTunnel * t
Tunnel this connection belongs to.
unsigned int latency_datapoints
How many latency observations did we make for this connection?
const char * GCPP_2s(struct CadetPeerPath *path)
Convert a path to a human-readable string.
#define LOG(level,...)
Performance metrics for a connection.
#define GNUNET_MQ_msg_extra(mvar, esize, type)
Allocate an envelope, with extra space allocated after the space needed by the message struct...
Definition: gnunet_mq_lib.h:52
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_delayed(struct GNUNET_TIME_Relative delay, GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run with a specified delay.
Definition: scheduler.c:1253
uint16_t type
The type of the message (GNUNET_MESSAGE_TYPE_XXXX), in big-endian format.
void GCP_remove_connection(struct CadetPeer *cp, struct CadetConnection *cc)
Remove a connection that went via this cp.
#define GNUNET_break_op(cond)
Use this for assertion violations caused by other peers (i.e.
struct GNUNET_STATISTICS_Handle * stats
Handle to the statistics service.
Message for a Key eXchange for a tunnel, with authentication.
Connection create message in queue, awaiting transmission by CORE.
void GCC_latency_observed(const struct GNUNET_CADET_ConnectionTunnelIdentifier *cid, struct GNUNET_TIME_Relative latency)
We observed some the given latency on the connection identified by cti.
const char * GNUNET_STRINGS_relative_time_to_string(struct GNUNET_TIME_Relative delta, int do_round)
Give relative time in human-readable fancy format.
Definition: strings.c:687
struct GNUNET_TIME_Relative retry_delay
How long do we wait before we try again with a CREATE message?
Randomness for IVs etc.
Connection confirmed, ready to carry traffic.
static char buf[2048]
struct GNUNET_MQ_Envelope * env
Pending message, NULL if we are ready to transmit.
static void keepalive_done(void *cls, const struct GNUNET_CADET_ConnectionTunnelIdentifier *cid)
Keepalive was transmitted.
int GNUNET_CONTAINER_multishortmap_put(struct GNUNET_CONTAINER_MultiShortmap *map, const struct GNUNET_ShortHashCode *key, void *value, enum GNUNET_CONTAINER_MultiHashMapOption opt)
Store a key-value pair in the map.
struct GNUNET_TIME_Relative aged_latency
Our current best estimate of the latency, based on a weighted average of at least latency_datapoints ...
#define GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE
Request the creation of a connection.
static int result
Global testing status.
struct GNUNET_TIME_Relative GNUNET_TIME_relative_multiply(struct GNUNET_TIME_Relative rel, unsigned long long factor)
Multiply relative time by a given factor.
Definition: time.c:442
struct CadetTConnection * ct
Which tunnel is using this connection?
void GCC_destroy_without_tunnel(struct CadetConnection *cc)
Destroy a connection, called if the tunnel association with the connection was already broken...
struct GNUNET_CADET_ConnectionTunnelIdentifier cid
ID of the connection.
#define GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE_ACK
Send origin an ACK that the connection is complete.
#define GNUNET_MESSAGE_TYPE_CADET_CHANNEL_KEEPALIVE
Announce connection is still alive (direction sensitive).
struct CadetTConnection * GCC_get_ct(struct CadetConnection *cc)
Return the tunnel associated with this connection.
void GCT_handle_kx(struct CadetTConnection *ct, const struct GNUNET_CADET_TunnelKeyExchangeMessage *msg)
Handle KX message that lacks authentication (and which will thus only be considered authenticated aft...
struct GNUNET_TIME_Absolute GNUNET_TIME_absolute_get(void)
Get the current time.
Definition: time.c:118
void GCP_add_connection(struct CadetPeer *cp, struct CadetConnection *cc)
Add a connection to this cp.
struct CadetConnection * cc
Connection handle.
void GCC_handle_duplicate_create(struct CadetConnection *cc)
We got a GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE for a connection that we already have...
There must only be one value per key; storing a value should fail if a value under the same key alrea...
int GNUNET_get_log_call_status(int caller_level, const char *comp, const char *file, const char *function, int line)
Decides whether a particular logging call should or should not be allowed to be made.
struct CadetConnectionMetrics metrics
Performance metrics for this connection.
struct GCP_MessageQueueManager * mq_man
Handle for calling GCP_request_mq_cancel() once we are finished.
Struct used to save messages in a non-ready tunnel to send once connected.
#define GNUNET_TIME_STD_BACKOFF(r)
Perform our standard exponential back-off calculation, starting at 1 ms and then going by a factor of...
Connection create message sent, waiting for ACK.
Handshake completed: session key available.
struct CadetPeerPath * GCC_get_path(struct CadetConnection *cc, unsigned int *off)
Obtain the path used by this connection.
#define GNUNET_memcmp(a, b)
Compare memory in a and b, where both must be of the same pointer type.
P2P messages used by CADET.
unsigned int GCPP_find_peer(struct CadetPeerPath *path, struct CadetPeer *cp)
Find peer&#39;s offset on path.
void(* GCC_ReadyCallback)(void *cls, int is_ready)
Function called to notify tunnel about change in our readyness.
struct CadetTunnelQueueEntry * keepalive_qe
Queue entry for keepalive messages.
void GCT_handle_kx_auth(struct CadetTConnection *ct, const struct GNUNET_CADET_TunnelKeyExchangeAuthMessage *msg)
Handle KX_AUTH message.
struct CadetConnection * GCC_lookup(const struct GNUNET_CADET_ConnectionTunnelIdentifier *cid)
Lookup a connection by its identifier.
void GCC_transmit(struct CadetConnection *cc, struct GNUNET_MQ_Envelope *env)
Transmit message msg via connection cc.
static void manage_first_hop_mq(void *cls, int available)
There has been a change in the message queue existence for our peer at the first hop.
Entry in list of connections used by tunnel, with metadata.
The identity of the host (wraps the signing key of the peer).
void * ready_cb_cls
Closure for ready_cb.
enum CadetConnectionState state
State of the connection.
Hash uniquely identifying a connection below a tunnel.
void * GNUNET_CONTAINER_multishortmap_get(const struct GNUNET_CONTAINER_MultiShortmap *map, const struct GNUNET_ShortHashCode *key)
Given a key find a value in the map matching the key.
void GCC_handle_encrypted(struct CadetConnection *cc, const struct GNUNET_CADET_TunnelEncryptedMessage *msg)
Handle encrypted message.
void GCPP_del_connection(struct CadetPeerPath *path, unsigned int off, struct CadetConnection *cc)
Notify path that it is no longer used for connection cc which ended at the path&#39;s offset off...
#define GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY
Request the destuction of a connection.
void GCP_request_mq_cancel(struct GCP_MessageQueueManager *mqm, struct GNUNET_MQ_Envelope *last_env)
Stops message queue change notifications.
Message for a Key eXchange for a tunnel.
struct CadetConnection * GCPP_get_connection(struct CadetPeerPath *path, struct CadetPeer *destination, unsigned int off)
Return connection to destination using path, or return NULL if no such connection exists...
Entry in list of pending tasks.
Definition: scheduler.c:134
unsigned long long num_acked_transmissions
How many packets that ought to generate an ACK did we send via this connection?
struct CadetPeer * GCPP_get_peer_at_offset(struct CadetPeerPath *path, unsigned int off)
Obtain the peer at offset off in path.
void GNUNET_CRYPTO_random_block(enum GNUNET_CRYPTO_Quality mode, void *buffer, size_t length)
Fill block with a random values.
struct GNUNET_TIME_Relative keepalive_period
How frequently do we send KEEPALIVE messages on idle connections?
void GCC_ack_observed(const struct GNUNET_CADET_ConnectionTunnelIdentifier *cid)
We observed an ACK for a message that was originally sent via the connection identified by cti...
void GCC_ack_expected(const struct GNUNET_CADET_ConnectionTunnelIdentifier *cid)
We sent a message for which we expect to receive an ACK via the connection identified by cti...
Header for all communications.
void GCC_handle_kx_auth(struct CadetConnection *cc, const struct GNUNET_CADET_TunnelKeyExchangeAuthMessage *msg)
Handle KX_AUTH message.
Time for absolute times used by GNUnet, in microseconds.
#define GNUNET_YES
Definition: gnunet_common.h:77
Uninitialized status, we have not yet even gotten the message queue.
uint32_t options
Connection options in network byte order.
struct GNUNET_CRYPTO_EcdhePublicKey ephemeral_key
Sender&#39;s ephemeral public ECC key encoded in a format suitable for network transmission, as created using &#39;gcry_sexp_sprint&#39;.
const char * GNUNET_e2s(const struct GNUNET_CRYPTO_EcdhePublicKey *p)
Convert a public key value to a string (for printing debug messages).
struct GNUNET_TIME_Absolute age
When was this connection first established? (by us sending or receiving the CREATE_ACK for the first ...
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_at(struct GNUNET_TIME_Absolute at, GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run at the specified time.
Definition: scheduler.c:1230
Information regarding a possible path to reach a peer.
struct GNUNET_ShortHashCode connection_of_tunnel
struct GNUNET_CADET_ConnectionTunnelIdentifier cid
ID of the connection.
void GCPP_add_connection(struct CadetPeerPath *path, unsigned int off, struct CadetConnection *cc)
Notify path that it is used for connection cc which ends at the path&#39;s offset off.
struct GNUNET_CADET_ConnectionTunnelIdentifier cid
ID of the connection.
Message for cadet connection creation.
#define GNUNET_free(ptr)
Wrapper around free.
const struct GNUNET_PeerIdentity * GCP_get_id(struct CadetPeer *cp)
Obtain the peer identity for a struct CadetPeer.
Time for relative time used by GNUnet, in microseconds.
struct GCP_MessageQueueManager * GCP_request_mq(struct CadetPeer *cp, GCP_MessageQueueNotificationCallback cb, void *cb_cls)
Start message queue change notifications.
unsigned int off
Offset of our destination in path.
void * GNUNET_SCHEDULER_cancel(struct GNUNET_SCHEDULER_Task *task)
Cancel the task with the specified identifier.
Definition: scheduler.c:966