2 This file is part of GNUnet.
3 Copyright (C) 2013 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
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 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
23 #include "gnunet_util_lib.h"
25 #include "gnunet_signatures.h"
27 #include "gnunet_transport_service.h"
28 #include "gnunet_core_service.h"
29 #include "gnunet_statistics_service.h"
31 #include "cadet_protocol.h"
33 #include "gnunet-service-cadet_peer.h"
34 #include "gnunet-service-cadet_dht.h"
35 #include "gnunet-service-cadet_connection.h"
36 #include "gnunet-service-cadet_tunnel.h"
37 #include "cadet_path.h"
39 #define LOG(level, ...) GNUNET_log_from (level,"cadet-p2p",__VA_ARGS__)
40 #define LOG2(level, ...) GNUNET_log_from_nocheck(level,"cadet-p2p",__VA_ARGS__)
43 /******************************************************************************/
44 /******************************** STRUCTS **********************************/
45 /******************************************************************************/
48 * Struct containing info about a queued transmission to this peer
55 struct CadetPeerQueue *next;
60 struct CadetPeerQueue *prev;
63 * Peer this transmission is directed to.
65 struct CadetPeer *peer;
68 * Connection this message belongs to.
70 struct CadetConnection *c;
78 * Pointer to info stucture used as cls.
90 uint16_t payload_type;
103 * Set when this message starts waiting for CORE.
105 struct GNUNET_TIME_Absolute start_waiting;
108 * Function to call on sending.
113 * Closure for callback.
119 * Struct containing all information regarding a given peer
129 * Axolotl permanent public key.
131 struct GNUNET_CRYPTO_EcdhePublicKey ax_key;
134 * Last time we heard from this peer
136 struct GNUNET_TIME_Absolute last_contact;
139 * Paths to reach the peer, ordered by ascending hop count
141 struct CadetPeerPath *path_head;
144 * Paths to reach the peer, ordered by ascending hop count
146 struct CadetPeerPath *path_tail;
149 * Handle to stop the DHT search for paths to this peer
151 struct GCD_search_handle *search_h;
154 * Handle to stop the DHT search for paths to this peer
156 struct GNUNET_SCHEDULER_Task *search_delayed;
159 * Tunnel to this peer, if any.
161 struct CadetTunnel *tunnel;
164 * Connections that go through this peer, indexed by tid;
166 struct GNUNET_CONTAINER_MultiHashMap *connections;
169 * Handle for queued transmissions
171 struct GNUNET_CORE_TransmitHandle *core_transmit;
176 struct GNUNET_TIME_Absolute tmt_time;
179 * Transmission queue to core DLL head
181 struct CadetPeerQueue *queue_head;
184 * Transmission queue to core DLL tail
186 struct CadetPeerQueue *queue_tail;
189 * How many messages are in the queue to this peer.
191 unsigned int queue_n;
196 struct GNUNET_HELLO_Message* hello;
200 /******************************************************************************/
201 /******************************* GLOBALS ***********************************/
202 /******************************************************************************/
205 * Global handle to the statistics service.
207 extern struct GNUNET_STATISTICS_Handle *stats;
210 * Local peer own ID (full value).
212 extern struct GNUNET_PeerIdentity my_full_id;
215 * Local peer own ID (short)
217 extern GNUNET_PEER_Id myid;
220 * Peers known, indexed by PeerIdentity (CadetPeer).
222 static struct GNUNET_CONTAINER_MultiPeerMap *peers;
225 * How many peers do we want to remember?
227 static unsigned long long max_peers;
230 * Percentage of messages that will be dropped (for test purposes only).
232 static unsigned long long drop_percent;
235 * Handle to communicate with core.
237 static struct GNUNET_CORE_Handle *core_handle;
240 * Handle to try to start new connections.
242 static struct GNUNET_TRANSPORT_Handle *transport_handle;
245 /******************************************************************************/
246 /***************************** DEBUG *********************************/
247 /******************************************************************************/
250 * Log all kinds of info about the queueing status of a peer.
252 * @param p Peer whose queue to show.
253 * @param level Error level to use for logging.
256 queue_debug (const struct CadetPeer *p, enum GNUNET_ErrorType level)
258 struct CadetPeerQueue *q;
261 do_log = GNUNET_get_log_call_status (level & (~GNUNET_ERROR_TYPE_BULK),
263 __FILE__, __FUNCTION__, __LINE__);
267 LOG2 (level, "QQQ Message queue towards %s\n", GCP_2s (p));
268 LOG2 (level, "QQQ queue length: %u\n", p->queue_n);
269 LOG2 (level, "QQQ core tmt rdy: %p\n", p->core_transmit);
271 for (q = p->queue_head; NULL != q; q = q->next)
273 LOG2 (level, "QQQ - %s %s on %s\n",
274 GC_m2s (q->type), GC_f2s (q->fwd), GCC_2s (q->c));
275 LOG2 (level, "QQQ payload %s, %u\n",
276 GC_m2s (q->payload_type), q->payload_id);
277 LOG2 (level, "QQQ size: %u bytes\n", q->size);
280 LOG2 (level, "QQQ End queue towards %s\n", GCP_2s (p));
285 * Log all kinds of info about a peer.
290 GCP_debug (const struct CadetPeer *p, enum GNUNET_ErrorType level)
292 struct CadetPeerPath *path;
296 do_log = GNUNET_get_log_call_status (level & (~GNUNET_ERROR_TYPE_BULK),
298 __FILE__, __FUNCTION__, __LINE__);
304 LOG2 (level, "PPP DEBUG PEER NULL\n");
308 LOG2 (level, "PPP DEBUG PEER %s\n", GCP_2s (p));
309 LOG2 (level, "PPP last contact %s\n",
310 GNUNET_STRINGS_absolute_time_to_string (p->last_contact));
311 for (path = p->path_head; NULL != path; path = path->next)
316 LOG2 (level, "PPP path: %s\n", s);
320 LOG2 (level, "PPP core transmit handle %p\n", p->core_transmit);
321 LOG2 (level, "PPP DHT GET handle %p\n", p->search_h);
322 if (NULL != p->connections)
323 conns = GNUNET_CONTAINER_multihashmap_size (p->connections);
326 LOG2 (level, "PPP # connections over link to peer: %u\n", conns);
327 queue_debug (p, level);
328 LOG2 (level, "PPP DEBUG END\n");
332 /******************************************************************************/
333 /***************************** CORE HELPERS *********************************/
334 /******************************************************************************/
338 * Iterator to notify all connections of a broken link. Mark connections
339 * to destroy after all traffic has been sent.
341 * @param cls Closure (peer disconnected).
342 * @param key Current key code (peer id).
343 * @param value Value in the hash map (connection).
345 * @return #GNUNET_YES to continue to iterate.
348 notify_broken (void *cls,
349 const struct GNUNET_HashCode *key,
352 struct CadetPeer *peer = cls;
353 struct CadetConnection *c = value;
355 LOG (GNUNET_ERROR_TYPE_DEBUG, " notifying %s due to %s\n",
356 GCC_2s (c), GCP_2s (peer));
357 GCC_notify_broken (c, peer);
364 * Remove the direct path to the peer.
366 * @param peer Peer to remove the direct path from.
369 static struct CadetPeerPath *
370 pop_direct_path (struct CadetPeer *peer)
372 struct CadetPeerPath *iter;
374 for (iter = peer->path_head; NULL != iter; iter = iter->next)
376 if (2 >= iter->length)
378 GNUNET_CONTAINER_DLL_remove (peer->path_head, peer->path_tail, iter);
386 /******************************************************************************/
387 /***************************** CORE CALLBACKS *********************************/
388 /******************************************************************************/
391 * Method called whenever a given peer connects.
394 * @param peer peer identity this notification is about
397 core_connect (void *cls, const struct GNUNET_PeerIdentity *peer)
399 struct CadetPeer *mp;
400 struct CadetPeerPath *path;
403 strncpy (own_id, GNUNET_i2s (&my_full_id), 15);
407 LOG (GNUNET_ERROR_TYPE_INFO, "CONNECTED %s (self)\n", own_id);
412 LOG (GNUNET_ERROR_TYPE_INFO, "CONNECTED %s <= %s\n",
413 own_id, GNUNET_i2s (peer));
415 path->peers[1] = mp->id;
416 GNUNET_PEER_change_rc (mp->id, 1);
417 GNUNET_STATISTICS_update (stats, "# peers", 1, GNUNET_NO);
419 path->peers[0] = myid;
420 GNUNET_PEER_change_rc (myid, 1);
421 GCP_add_path (mp, path, GNUNET_YES);
423 mp->connections = GNUNET_CONTAINER_multihashmap_create (32, GNUNET_YES);
425 if (NULL != GCP_get_tunnel (mp) &&
426 0 > GNUNET_CRYPTO_cmp_peer_identity (&my_full_id, peer))
436 * Method called whenever a peer disconnects.
439 * @param peer peer identity this notification is about
442 core_disconnect (void *cls, const struct GNUNET_PeerIdentity *peer)
445 struct CadetPeerPath *direct_path;
448 strncpy (own_id, GNUNET_i2s (&my_full_id), 15);
449 p = GNUNET_CONTAINER_multipeermap_get (peers, peer);
456 LOG (GNUNET_ERROR_TYPE_INFO, "DISCONNECTED %s (self)\n", own_id);
458 LOG (GNUNET_ERROR_TYPE_INFO, "DISCONNECTED %s <= %s\n",
459 own_id, GNUNET_i2s (peer));
460 direct_path = pop_direct_path (p);
461 GNUNET_CONTAINER_multihashmap_iterate (p->connections, ¬ify_broken, p);
462 GNUNET_CONTAINER_multihashmap_destroy (p->connections);
463 p->connections = NULL;
464 if (NULL != p->core_transmit)
466 GNUNET_CORE_notify_transmit_ready_cancel (p->core_transmit);
467 p->core_transmit = NULL;
468 p->tmt_time.abs_value_us = 0;
470 GNUNET_STATISTICS_update (stats, "# peers", -1, GNUNET_NO);
472 path_destroy (direct_path);
478 * Functions to handle messages from core
480 static struct GNUNET_CORE_MessageHandler core_handlers[] = {
481 {&GCC_handle_create, GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE, 0},
482 {&GCC_handle_confirm, GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK,
483 sizeof (struct GNUNET_CADET_ConnectionACK)},
484 {&GCC_handle_broken, GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN,
485 sizeof (struct GNUNET_CADET_ConnectionBroken)},
486 {&GCC_handle_destroy, GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY,
487 sizeof (struct GNUNET_CADET_ConnectionDestroy)},
488 {&GCC_handle_ack, GNUNET_MESSAGE_TYPE_CADET_ACK,
489 sizeof (struct GNUNET_CADET_ACK)},
490 {&GCC_handle_poll, GNUNET_MESSAGE_TYPE_CADET_POLL,
491 sizeof (struct GNUNET_CADET_Poll)},
492 {&GCC_handle_kx, GNUNET_MESSAGE_TYPE_CADET_KX, 0},
493 {&GCC_handle_encrypted, GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED, 0},
494 {&GCC_handle_encrypted, GNUNET_MESSAGE_TYPE_CADET_AX, 0}
499 * To be called on core init/fail.
501 * @param cls Closure (config)
502 * @param identity the public identity of this peer
505 core_init (void *cls,
506 const struct GNUNET_PeerIdentity *identity)
508 const struct GNUNET_CONFIGURATION_Handle *c = cls;
511 LOG (GNUNET_ERROR_TYPE_DEBUG, "Core init\n");
512 if (0 != memcmp (identity, &my_full_id, sizeof (my_full_id)))
514 LOG (GNUNET_ERROR_TYPE_ERROR, _("Wrong CORE service\n"));
515 LOG (GNUNET_ERROR_TYPE_ERROR, " core id %s\n", GNUNET_i2s (identity));
516 LOG (GNUNET_ERROR_TYPE_ERROR, " my id %s\n", GNUNET_i2s (&my_full_id));
517 GNUNET_CORE_disconnect (core_handle);
518 core_handle = GNUNET_CORE_connect (c, /* Main configuration */
519 NULL, /* Closure passed to CADET functions */
520 &core_init, /* Call core_init once connected */
521 &core_connect, /* Handle connects */
522 &core_disconnect, /* remove peers on disconnects */
523 NULL, /* Don't notify about all incoming messages */
524 GNUNET_NO, /* For header only in notification */
525 NULL, /* Don't notify about all outbound messages */
526 GNUNET_NO, /* For header-only out notification */
527 core_handlers); /* Register these handlers */
537 * Core callback to write a pre-constructed data packet to core buffer
539 * @param cls Closure (CadetTransmissionDescriptor with data in "data" member).
540 * @param size Number of bytes available in buf.
541 * @param buf Where the to write the message.
543 * @return number of bytes written to buf
546 send_core_data_raw (void *cls, size_t size, void *buf)
548 struct GNUNET_MessageHeader *msg = cls;
551 GNUNET_assert (NULL != msg);
552 total_size = ntohs (msg->size);
554 if (total_size > size)
559 memcpy (buf, msg, total_size);
566 * Function to send a create connection message to a peer.
568 * @param c Connection to create.
569 * @param size number of bytes available in buf
570 * @param buf where the callee should write the message
571 * @return number of bytes written to buf
574 send_core_connection_create (struct CadetConnection *c, size_t size, void *buf)
576 struct GNUNET_CADET_ConnectionCreate *msg;
577 struct GNUNET_PeerIdentity *peer_ptr;
578 const struct CadetPeerPath *p = GCC_get_path (c);
585 LOG (GNUNET_ERROR_TYPE_DEBUG, "Sending CONNECTION CREATE...\n");
587 sizeof (struct GNUNET_CADET_ConnectionCreate) +
588 p->length * sizeof (struct GNUNET_PeerIdentity);
590 if (size < size_needed || NULL == buf)
595 msg = (struct GNUNET_CADET_ConnectionCreate *) buf;
596 msg->header.size = htons (size_needed);
597 msg->header.type = htons (GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE);
598 msg->cid = *GCC_get_id (c);
600 peer_ptr = (struct GNUNET_PeerIdentity *) &msg[1];
601 for (i = 0; i < p->length; i++)
603 GNUNET_PEER_resolve (p->peers[i], peer_ptr++);
606 LOG (GNUNET_ERROR_TYPE_DEBUG,
607 "CONNECTION CREATE (%u bytes long) sent!\n",
614 * Creates a path ack message in buf and frees all unused resources.
616 * @param c Connection to send an ACK on.
617 * @param size number of bytes available in buf
618 * @param buf where the callee should write the message
620 * @return number of bytes written to buf
623 send_core_connection_ack (struct CadetConnection *c, size_t size, void *buf)
625 struct GNUNET_CADET_ConnectionACK *msg = buf;
627 LOG (GNUNET_ERROR_TYPE_DEBUG, "Sending CONNECTION ACK...\n");
628 if (sizeof (struct GNUNET_CADET_ConnectionACK) > size)
633 msg->header.size = htons (sizeof (struct GNUNET_CADET_ConnectionACK));
634 msg->header.type = htons (GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK);
635 msg->cid = *GCC_get_id (c);
637 LOG (GNUNET_ERROR_TYPE_DEBUG, "CONNECTION ACK sent!\n");
638 return sizeof (struct GNUNET_CADET_ConnectionACK);
642 /******************************************************************************/
643 /******************************** STATIC ***********************************/
644 /******************************************************************************/
648 * Get priority for a queued message.
650 * @param q Queued message
652 * @return CORE priority to use.
654 static enum GNUNET_CORE_Priority
655 get_priority (struct CadetPeerQueue *q)
657 enum GNUNET_CORE_Priority low;
658 enum GNUNET_CORE_Priority high;
663 return GNUNET_CORE_PRIO_BACKGROUND;
666 /* Relayed traffic has lower priority, our own traffic has higher */
667 if (NULL == q->c || GNUNET_NO == GCC_is_origin (q->c, q->fwd))
669 low = GNUNET_CORE_PRIO_BEST_EFFORT;
670 high = GNUNET_CORE_PRIO_URGENT;
674 low = GNUNET_CORE_PRIO_URGENT;
675 high = GNUNET_CORE_PRIO_CRITICAL_CONTROL;
678 /* Bulky payload has lower priority, control traffic has higher. */
679 if (GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED == q->type
680 || GNUNET_MESSAGE_TYPE_CADET_AX == q->type)
688 * Iterator over tunnel hash map entries to destroy the tunnel during shutdown.
691 * @param key current key code
692 * @param value value in the hash map
693 * @return #GNUNET_YES if we should continue to iterate,
697 shutdown_tunnel (void *cls,
698 const struct GNUNET_PeerIdentity *key,
701 struct CadetPeer *p = value;
702 struct CadetTunnel *t = p->tunnel;
712 * Check if peer is searching for a path (either active or delayed search).
714 * @param peer Peer to check
716 * @return GNUNET_YES if there is a search active.
717 * GNUNET_NO otherwise.
720 is_searching (const struct CadetPeer *peer)
722 return (NULL == peer->search_h && NULL == peer->search_delayed) ?
723 GNUNET_NO : GNUNET_YES;
728 * @brief Start a search for a peer.
730 * @param cls Closure (Peer to search for).
731 * @param tc Task context.
734 delayed_search (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
736 struct CadetPeer *peer = cls;
738 peer->search_delayed = NULL;
740 if (0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
743 GCP_start_search (peer);
748 * Destroy the peer_info and free any allocated resources linked to it
750 * @param peer The peer_info to destroy.
752 * @return GNUNET_OK on success
755 peer_destroy (struct CadetPeer *peer)
757 struct GNUNET_PeerIdentity id;
758 struct CadetPeerPath *p;
759 struct CadetPeerPath *nextp;
761 GNUNET_PEER_resolve (peer->id, &id);
762 GNUNET_PEER_change_rc (peer->id, -1);
764 LOG (GNUNET_ERROR_TYPE_WARNING, "destroying peer %s\n", GNUNET_i2s (&id));
767 GNUNET_CONTAINER_multipeermap_remove (peers, &id, peer))
770 LOG (GNUNET_ERROR_TYPE_WARNING, " not in peermap!!\n");
772 GCP_stop_search (peer);
777 GNUNET_CONTAINER_DLL_remove (peer->path_head, peer->path_tail, p);
781 GCT_destroy_empty (peer->tunnel);
788 * Returns if peer is used (has a tunnel or is neighbor).
790 * @param peer Peer to check.
792 * @return #GNUNET_YES if peer is in use.
795 peer_is_used (struct CadetPeer *peer)
797 struct CadetPeerPath *p;
799 if (NULL != peer->tunnel)
802 for (p = peer->path_head; NULL != p; p = p->next)
812 * Iterator over all the peers to get the oldest timestamp.
814 * @param cls Closure (unsued).
815 * @param key ID of the peer.
816 * @param value Peer_Info of the peer.
819 peer_get_oldest (void *cls,
820 const struct GNUNET_PeerIdentity *key,
823 struct CadetPeer *p = value;
824 struct GNUNET_TIME_Absolute *abs = cls;
826 /* Don't count active peers */
827 if (GNUNET_YES == peer_is_used (p))
830 if (abs->abs_value_us < p->last_contact.abs_value_us)
831 abs->abs_value_us = p->last_contact.abs_value_us;
838 * Iterator over all the peers to remove the oldest entry.
840 * @param cls Closure (unsued).
841 * @param key ID of the peer.
842 * @param value Peer_Info of the peer.
845 peer_timeout (void *cls,
846 const struct GNUNET_PeerIdentity *key,
849 struct CadetPeer *p = value;
850 struct GNUNET_TIME_Absolute *abs = cls;
852 LOG (GNUNET_ERROR_TYPE_WARNING,
853 "peer %s timeout\n", GNUNET_i2s (key));
855 if (p->last_contact.abs_value_us == abs->abs_value_us &&
856 GNUNET_NO == peer_is_used (p))
866 * Delete oldest unused peer.
869 peer_delete_oldest (void)
871 struct GNUNET_TIME_Absolute abs;
873 abs = GNUNET_TIME_UNIT_FOREVER_ABS;
875 GNUNET_CONTAINER_multipeermap_iterate (peers,
878 GNUNET_CONTAINER_multipeermap_iterate (peers,
885 * Choose the best (yet unused) path towards a peer,
886 * considering the tunnel properties.
888 * @param peer The destination peer.
890 * @return Best current known path towards the peer, if any.
892 static struct CadetPeerPath *
893 peer_get_best_path (const struct CadetPeer *peer)
895 struct CadetPeerPath *best_p;
896 struct CadetPeerPath *p;
897 unsigned int best_cost;
900 best_cost = UINT_MAX;
902 for (p = peer->path_head; NULL != p; p = p->next)
904 if (GNUNET_NO == path_is_valid (p))
905 continue; /* Don't use invalid paths. */
906 if (GNUNET_YES == GCT_is_path_used (peer->tunnel, p))
907 continue; /* If path is already in use, skip it. */
909 if ((cost = GCT_get_path_cost (peer->tunnel, p)) < best_cost)
920 * Is this queue element sendable?
922 * - All management traffic is always sendable.
923 * - For payload traffic, check the connection flow control.
925 * @param q Queue element to inspect.
927 * @return #GNUNET_YES if it is sendable, #GNUNET_NO otherwise.
930 queue_is_sendable (struct CadetPeerQueue *q)
932 /* Is PID-independent? */
935 case GNUNET_MESSAGE_TYPE_CADET_ACK:
936 case GNUNET_MESSAGE_TYPE_CADET_POLL:
937 case GNUNET_MESSAGE_TYPE_CADET_KX:
938 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE:
939 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK:
940 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY:
941 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN:
944 case GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED:
945 case GNUNET_MESSAGE_TYPE_CADET_AX:
952 return GCC_is_sendable (q->c, q->fwd);
957 * Get first sendable message.
959 * @param peer The destination peer.
961 * @return First transmittable message, if any. Otherwise, NULL.
963 static struct CadetPeerQueue *
964 peer_get_first_message (const struct CadetPeer *peer)
966 struct CadetPeerQueue *q;
968 for (q = peer->queue_head; NULL != q; q = q->next)
970 LOG (GNUNET_ERROR_TYPE_DEBUG, "Checking q:%p on c:%s\n", q, GCC_2s (q->c));
971 if (queue_is_sendable (q))
980 * Function to process paths received for a new peer addition. The recorded
981 * paths form the initial tunnel, which can be optimized later.
982 * Called on each result obtained for the DHT search.
988 search_handler (void *cls, const struct CadetPeerPath *path)
990 struct CadetPeer *peer = cls;
991 unsigned int connection_count;
993 GCP_add_path_to_all (path, GNUNET_NO);
995 /* Count connections */
996 connection_count = GCT_count_connections (peer->tunnel);
998 /* If we already have our minimum (or more) connections, it's enough */
999 if (CONNECTIONS_PER_TUNNEL <= connection_count)
1002 if (CADET_TUNNEL_SEARCHING == GCT_get_cstate (peer->tunnel))
1004 LOG (GNUNET_ERROR_TYPE_DEBUG, " ... connect!\n");
1012 * Adjust core requested size to accomodate an ACK.
1014 * @param message_size Requested size.
1016 * @return Size enough to fit @c message_size and an ACK.
1019 get_core_size (size_t message_size)
1021 return message_size + sizeof (struct GNUNET_CADET_ACK);
1026 * Fill a core buffer with the appropriate data for the queued message.
1028 * @param queue Queue element for the message.
1029 * @param buf Core buffer to fill.
1030 * @param size Size remaining in @c buf.
1031 * @param[out] pid In case its an encrypted payload, set payload.
1033 * @return Bytes written to @c buf.
1036 fill_buf (struct CadetPeerQueue *queue, void *buf, size_t size, uint32_t *pid)
1038 struct CadetConnection *c = queue->c;
1041 switch (queue->type)
1043 case GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED:
1044 *pid = GCC_get_pid (queue->c, queue->fwd);
1045 LOG (GNUNET_ERROR_TYPE_DEBUG, " otr payload ID %u\n", *pid);
1046 msg_size = send_core_data_raw (queue->cls, size, buf);
1047 ((struct GNUNET_CADET_Encrypted *) buf)->pid = htonl (*pid);
1049 case GNUNET_MESSAGE_TYPE_CADET_AX:
1050 *pid = GCC_get_pid (queue->c, queue->fwd);
1051 LOG (GNUNET_ERROR_TYPE_DEBUG, " ax payload ID %u\n", *pid);
1052 msg_size = send_core_data_raw (queue->cls, size, buf);
1053 ((struct GNUNET_CADET_AX *) buf)->pid = htonl (*pid);
1055 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY:
1056 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN:
1057 case GNUNET_MESSAGE_TYPE_CADET_KX:
1058 case GNUNET_MESSAGE_TYPE_CADET_ACK:
1059 case GNUNET_MESSAGE_TYPE_CADET_POLL:
1060 LOG (GNUNET_ERROR_TYPE_DEBUG, " raw %s\n", GC_m2s (queue->type));
1061 msg_size = send_core_data_raw (queue->cls, size, buf);
1063 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE:
1064 LOG (GNUNET_ERROR_TYPE_DEBUG, " path create\n");
1065 if (GCC_is_origin (c, GNUNET_YES))
1066 msg_size = send_core_connection_create (c, size, buf);
1068 msg_size = send_core_data_raw (queue->cls, size, buf);
1070 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK:
1071 LOG (GNUNET_ERROR_TYPE_DEBUG, " path ack\n");
1072 if (GCC_is_origin (c, GNUNET_NO) ||
1073 GCC_is_origin (c, GNUNET_YES))
1075 msg_size = send_core_connection_ack (c, size, buf);
1079 msg_size = send_core_data_raw (queue->cls, size, buf);
1082 case GNUNET_MESSAGE_TYPE_CADET_DATA:
1083 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_CREATE:
1084 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_DESTROY:
1085 /* This should be encapsulted */
1091 LOG (GNUNET_ERROR_TYPE_WARNING, " type unknown: %u\n", queue->type);
1095 GNUNET_assert (size >= msg_size);
1102 * Core callback to write a queued packet to core buffer
1104 * @param cls Closure (peer info).
1105 * @param size Number of bytes available in buf.
1106 * @param buf Where the to write the message.
1108 * @return number of bytes written to buf
1111 queue_send (void *cls, size_t size, void *buf)
1113 struct CadetPeer *peer = cls;
1114 struct CadetConnection *c;
1115 struct CadetPeerQueue *queue;
1116 struct GNUNET_TIME_Relative core_wait_time;
1117 const struct GNUNET_PeerIdentity *dst_id;
1124 LOG (GNUNET_ERROR_TYPE_DEBUG, "\n");
1125 LOG (GNUNET_ERROR_TYPE_DEBUG, "\n");
1126 LOG (GNUNET_ERROR_TYPE_DEBUG, "Queue send towards %s (max %u)\n",
1127 GCP_2s (peer), size);
1129 /* Sanity checking */
1130 if (NULL == buf || 0 == size)
1132 LOG (GNUNET_ERROR_TYPE_DEBUG, "Buffer size 0.\n");
1133 peer->tmt_time.abs_value_us = 0;
1134 peer->core_transmit = NULL;
1143 peer->core_transmit = NULL;
1144 queue = peer_get_first_message (peer);
1147 GNUNET_break (0); /* Core tmt_rdy should've been canceled */
1148 peer->tmt_time.abs_value_us = 0;
1151 core_wait_time = GNUNET_TIME_absolute_get_duration (peer->tmt_time);
1152 LOG (GNUNET_ERROR_TYPE_DEBUG, " core wait time %s\n",
1153 GNUNET_STRINGS_relative_time_to_string (core_wait_time, GNUNET_NO));
1154 peer->tmt_time.abs_value_us = 0;
1156 /* Copy all possible messages to the core buffer */
1157 while (NULL != queue && rest >= queue->size)
1161 LOG (GNUNET_ERROR_TYPE_DEBUG, " on connection %s %s\n",
1162 GCC_2s (c), GC_f2s(queue->fwd));
1163 LOG (GNUNET_ERROR_TYPE_DEBUG, " size %u ok (%u/%u)\n",
1164 queue->size, total_size, size);
1166 msg_size = fill_buf (queue, (void *) dst, size, &pid);
1168 if (0 < drop_percent &&
1169 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, 101) < drop_percent)
1171 LOG (GNUNET_ERROR_TYPE_WARNING, "DD %s (%s %u) on connection %s %s\n",
1172 GC_m2s (queue->type), GC_m2s (queue->payload_type),
1173 queue->payload_id, GCC_2s (c), GC_f2s (queue->fwd));
1178 LOG (GNUNET_ERROR_TYPE_INFO,
1179 "snd %s (%s %4u) on connection %s (%p) %s (size %u)\n",
1180 GC_m2s (queue->type), GC_m2s (queue->payload_type),
1181 queue->payload_id, GCC_2s (c), c, GC_f2s (queue->fwd), msg_size);
1183 total_size += msg_size;
1185 dst = &dst[msg_size];
1188 /* Free queue, but cls was freed by send_core_* in fill_buf. */
1189 (void) GCP_queue_destroy (queue, GNUNET_NO, GNUNET_YES, pid);
1192 queue = peer_get_first_message (peer);
1195 /* If more data in queue, send next */
1198 LOG (GNUNET_ERROR_TYPE_DEBUG, " more data! (%u)\n", queue->size);
1199 if (NULL == peer->core_transmit)
1201 dst_id = GNUNET_PEER_resolve2 (peer->id);
1202 peer->core_transmit =
1203 GNUNET_CORE_notify_transmit_ready (core_handle,
1204 GNUNET_NO, get_priority (queue),
1205 GNUNET_TIME_UNIT_FOREVER_REL,
1207 get_core_size (queue->size),
1210 peer->tmt_time = GNUNET_TIME_absolute_get ();
1211 queue->start_waiting = GNUNET_TIME_absolute_get ();
1215 LOG (GNUNET_ERROR_TYPE_DEBUG, "* tmt rdy called somewhere else\n");
1217 // GCC_start_poll (); FIXME needed?
1221 // GCC_stop_poll(); FIXME needed?
1224 LOG (GNUNET_ERROR_TYPE_DEBUG, " return %d\n", total_size);
1225 queue_debug (peer, GNUNET_ERROR_TYPE_DEBUG);
1231 /******************************************************************************/
1232 /******************************** API ***********************************/
1233 /******************************************************************************/
1237 * Free a transmission that was already queued with all resources
1238 * associated to the request.
1240 * If connection was marked to be destroyed, and this was the last queued
1241 * message on it, the connection will be free'd as a result.
1243 * @param queue Queue handler to cancel.
1244 * @param clear_cls Is it necessary to free associated cls?
1245 * @param sent Was it really sent? (Could have been canceled)
1246 * @param pid PID, if relevant (was sent and was a payload message).
1248 * @return #GNUNET_YES if connection was destroyed as a result,
1249 * #GNUNET_NO otherwise.
1252 GCP_queue_destroy (struct CadetPeerQueue *queue, int clear_cls,
1253 int sent, uint32_t pid)
1255 struct CadetPeer *peer;
1256 int connection_destroyed;
1259 LOG (GNUNET_ERROR_TYPE_DEBUG, "queue destroy %s\n", GC_m2s (queue->type));
1260 if (GNUNET_YES == clear_cls)
1262 LOG (GNUNET_ERROR_TYPE_DEBUG, " free cls\n");
1263 switch (queue->type)
1265 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY:
1266 LOG (GNUNET_ERROR_TYPE_INFO, "destroying a DESTROY message\n");
1268 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK:
1269 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE:
1270 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN:
1271 case GNUNET_MESSAGE_TYPE_CADET_KX:
1272 case GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED:
1273 case GNUNET_MESSAGE_TYPE_CADET_AX:
1274 case GNUNET_MESSAGE_TYPE_CADET_ACK:
1275 case GNUNET_MESSAGE_TYPE_CADET_POLL:
1276 GNUNET_free_non_null (queue->cls);
1281 LOG (GNUNET_ERROR_TYPE_ERROR, " type %s unknown!\n",
1282 GC_m2s (queue->type));
1285 GNUNET_CONTAINER_DLL_remove (peer->queue_head, peer->queue_tail, queue);
1287 if (queue->type != GNUNET_MESSAGE_TYPE_CADET_ACK &&
1288 queue->type != GNUNET_MESSAGE_TYPE_CADET_POLL)
1293 if (NULL != queue->cont)
1295 struct GNUNET_TIME_Relative wait_time;
1297 wait_time = GNUNET_TIME_absolute_get_duration (queue->start_waiting);
1298 LOG (GNUNET_ERROR_TYPE_DEBUG, " calling callback, time elapsed %s\n",
1299 GNUNET_STRINGS_relative_time_to_string (wait_time, GNUNET_NO));
1300 connection_destroyed = queue->cont (queue->cont_cls,
1301 queue->c, sent, queue->type, pid,
1302 queue->fwd, queue->size, wait_time);
1306 connection_destroyed = GNUNET_NO;
1309 if (NULL == peer_get_first_message (peer) && NULL != peer->core_transmit)
1311 GNUNET_CORE_notify_transmit_ready_cancel (peer->core_transmit);
1312 peer->core_transmit = NULL;
1313 peer->tmt_time.abs_value_us = 0;
1316 GNUNET_free (queue);
1317 return connection_destroyed;
1322 * @brief Queue and pass message to core when possible.
1324 * @param peer Peer towards which to queue the message.
1325 * @param cls Closure (@c type dependant). It will be used by queue_send to
1326 * build the message to be sent if not already prebuilt.
1327 * @param type Type of the message, 0 for a raw message.
1328 * @param size Size of the message.
1329 * @param c Connection this message belongs to (can be NULL).
1330 * @param fwd Is this a message going root->dest? (FWD ACK are NOT FWD!)
1331 * @param cont Continuation to be called once CORE has taken the message.
1332 * @param cont_cls Closure for @c cont.
1334 * @return Handle to cancel the message before it is sent. Once cont is called
1335 * message has been sent and therefore the handle is no longer valid.
1337 struct CadetPeerQueue *
1338 GCP_queue_add (struct CadetPeer *peer, void *cls, uint16_t type,
1339 uint16_t payload_type, uint32_t payload_id, size_t size,
1340 struct CadetConnection *c, int fwd,
1341 GCP_sent cont, void *cont_cls)
1343 struct CadetPeerQueue *q;
1348 if (NULL == c && GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN != type)
1349 error_level = GNUNET_ERROR_TYPE_ERROR;
1351 error_level = GNUNET_ERROR_TYPE_INFO;
1353 "que %s (%s %4u) on connection %s (%p) %s towards %s (size %u)\n",
1354 GC_m2s (type), GC_m2s (payload_type), payload_id,
1355 GCC_2s (c), c, GC_f2s (fwd), GCP_2s (peer), size);
1357 if (error_level == GNUNET_ERROR_TYPE_ERROR)
1359 if (NULL == peer->connections)
1361 /* We are not connected to this peer, ignore request. */
1362 LOG (GNUNET_ERROR_TYPE_WARNING, "%s not a neighbor\n", GCP_2s (peer));
1363 GNUNET_STATISTICS_update (stats, "# messages dropped due to wrong hop", 1,
1370 if (GNUNET_MESSAGE_TYPE_CADET_POLL == type ||
1371 GNUNET_MESSAGE_TYPE_CADET_ACK == type)
1376 LOG (GNUNET_ERROR_TYPE_DEBUG, "priority %d\n", priority);
1378 call_core = (NULL == c || type == GNUNET_MESSAGE_TYPE_CADET_KX) ?
1379 GNUNET_YES : GCC_is_sendable (c, fwd);
1380 q = GNUNET_new (struct CadetPeerQueue);
1383 q->payload_type = payload_type;
1384 q->payload_id = payload_id;
1390 q->cont_cls = cont_cls;
1393 GNUNET_CONTAINER_DLL_insert_tail (peer->queue_head, peer->queue_tail, q);
1398 GNUNET_CONTAINER_DLL_insert (peer->queue_head, peer->queue_tail, q);
1399 call_core = GNUNET_YES;
1402 q->start_waiting = GNUNET_TIME_absolute_get ();
1403 if (NULL == peer->core_transmit && GNUNET_YES == call_core)
1405 LOG (GNUNET_ERROR_TYPE_DEBUG,
1406 "calling core tmt rdy towards %s for %u bytes\n",
1407 GCP_2s (peer), size);
1408 peer->core_transmit =
1409 GNUNET_CORE_notify_transmit_ready (core_handle,
1410 GNUNET_NO, get_priority (q),
1411 GNUNET_TIME_UNIT_FOREVER_REL,
1412 GNUNET_PEER_resolve2 (peer->id),
1413 get_core_size (size),
1415 peer->tmt_time = GNUNET_TIME_absolute_get ();
1417 else if (GNUNET_NO == call_core)
1419 LOG (GNUNET_ERROR_TYPE_DEBUG, "core tmt rdy towards %s not needed\n",
1425 struct GNUNET_TIME_Relative elapsed;
1426 elapsed = GNUNET_TIME_absolute_get_duration (peer->tmt_time);
1427 LOG (GNUNET_ERROR_TYPE_DEBUG, "core tmt rdy towards %s already called %s\n",
1429 GNUNET_STRINGS_relative_time_to_string (elapsed, GNUNET_NO));
1432 queue_debug (peer, GNUNET_ERROR_TYPE_DEBUG);
1438 * Cancel all queued messages to a peer that belong to a certain connection.
1440 * @param peer Peer towards whom to cancel.
1441 * @param c Connection whose queued messages to cancel. Might be destroyed by
1442 * the sent continuation call.
1445 GCP_queue_cancel (struct CadetPeer *peer, struct CadetConnection *c)
1447 struct CadetPeerQueue *q;
1448 struct CadetPeerQueue *next;
1449 struct CadetPeerQueue *prev;
1450 int connection_destroyed;
1452 connection_destroyed = GNUNET_NO;
1453 for (q = peer->queue_head; NULL != q; q = next)
1458 LOG (GNUNET_ERROR_TYPE_DEBUG, "GMP queue cancel %s\n", GC_m2s (q->type));
1459 GNUNET_break (GNUNET_NO == connection_destroyed);
1460 if (GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY == q->type)
1466 connection_destroyed = GCP_queue_destroy (q, GNUNET_YES, GNUNET_NO, 0);
1469 /* Get next from prev, q->next might be already freed:
1470 * queue destroy -> callback -> GCC_destroy -> cancel_queues -> here
1473 next = peer->queue_head;
1483 if (NULL == peer->queue_head && NULL != peer->core_transmit)
1485 GNUNET_CORE_notify_transmit_ready_cancel (peer->core_transmit);
1486 peer->core_transmit = NULL;
1487 peer->tmt_time.abs_value_us = 0;
1493 * Get the first transmittable message for a connection.
1495 * @param peer Neighboring peer.
1496 * @param c Connection.
1498 * @return First transmittable message.
1500 static struct CadetPeerQueue *
1501 connection_get_first_message (struct CadetPeer *peer, struct CadetConnection *c)
1503 struct CadetPeerQueue *q;
1505 for (q = peer->queue_head; NULL != q; q = q->next)
1509 if (queue_is_sendable (q))
1511 LOG (GNUNET_ERROR_TYPE_DEBUG, " sendable!!\n");
1514 LOG (GNUNET_ERROR_TYPE_DEBUG, " not sendable\n");
1522 * Get the first message for a connection and unqueue it.
1524 * Only tunnel (or higher) level messages are unqueued. Connection specific
1525 * messages are silently destroyed upon encounter.
1527 * @param peer Neighboring peer.
1528 * @param c Connection.
1529 * @param destroyed[in/out] Was the connection destroyed (prev/as a result)?.
1532 * @return First message for this connection.
1534 struct GNUNET_MessageHeader *
1535 GCP_connection_pop (struct CadetPeer *peer,
1536 struct CadetConnection *c,
1539 struct CadetPeerQueue *q;
1540 struct CadetPeerQueue *next;
1541 struct GNUNET_MessageHeader *msg;
1544 GNUNET_assert (NULL != destroyed);
1545 LOG (GNUNET_ERROR_TYPE_DEBUG, "connection_pop on connection %p\n", c);
1546 for (q = peer->queue_head; NULL != q; q = next)
1551 LOG (GNUNET_ERROR_TYPE_DEBUG, " - queued: %s (%s %u), cont: %p\n",
1552 GC_m2s (q->type), GC_m2s (q->payload_type), q->payload_id,
1556 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE:
1557 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK:
1558 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY:
1559 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN:
1560 case GNUNET_MESSAGE_TYPE_CADET_ACK:
1561 case GNUNET_MESSAGE_TYPE_CADET_POLL:
1562 dest = GCP_queue_destroy (q, GNUNET_YES, GNUNET_NO, 0);
1563 if (GNUNET_YES == dest)
1565 GNUNET_break (GNUNET_NO == *destroyed);
1566 *destroyed = GNUNET_YES;
1570 case GNUNET_MESSAGE_TYPE_CADET_KX:
1571 case GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED:
1572 case GNUNET_MESSAGE_TYPE_CADET_AX:
1573 case GNUNET_MESSAGE_TYPE_CADET_AX_KX:
1574 msg = (struct GNUNET_MessageHeader *) q->cls;
1575 dest = GCP_queue_destroy (q, GNUNET_NO, GNUNET_NO, 0);
1576 if (GNUNET_YES == dest)
1578 GNUNET_break (GNUNET_NO == *destroyed);
1579 *destroyed = GNUNET_YES;
1585 LOG (GNUNET_ERROR_TYPE_DEBUG, "Unknown message %s\n", GC_m2s (q->type));
1593 * Unlock a possibly locked queue for a connection.
1595 * If there is a message that can be sent on this connection, call core for it.
1596 * Otherwise (if core transmit is already called or there is no sendable
1597 * message) do nothing.
1599 * @param peer Peer who keeps the queue.
1600 * @param c Connection whose messages to unlock.
1603 GCP_queue_unlock (struct CadetPeer *peer, struct CadetConnection *c)
1605 struct CadetPeerQueue *q;
1608 if (NULL != peer->core_transmit)
1610 LOG (GNUNET_ERROR_TYPE_DEBUG, " already unlocked!\n");
1611 return; /* Already unlocked */
1614 q = connection_get_first_message (peer, c);
1617 LOG (GNUNET_ERROR_TYPE_DEBUG, " queue empty!\n");
1618 return; /* Nothing to transmit */
1622 peer->core_transmit =
1623 GNUNET_CORE_notify_transmit_ready (core_handle,
1624 GNUNET_NO, get_priority (q),
1625 GNUNET_TIME_UNIT_FOREVER_REL,
1626 GNUNET_PEER_resolve2 (peer->id),
1627 get_core_size (size),
1630 peer->tmt_time = GNUNET_TIME_absolute_get ();
1635 * Initialize the peer subsystem.
1637 * @param c Configuration.
1640 GCP_init (const struct GNUNET_CONFIGURATION_Handle *c)
1642 LOG (GNUNET_ERROR_TYPE_DEBUG, "init\n");
1643 peers = GNUNET_CONTAINER_multipeermap_create (128, GNUNET_NO);
1645 GNUNET_CONFIGURATION_get_value_number (c, "CADET", "MAX_PEERS",
1648 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_WARNING,
1649 "CADET", "MAX_PEERS", "USING DEFAULT");
1654 GNUNET_CONFIGURATION_get_value_number (c, "CADET", "DROP_PERCENT",
1661 LOG (GNUNET_ERROR_TYPE_WARNING, "**************************************\n");
1662 LOG (GNUNET_ERROR_TYPE_WARNING, "Cadet is running with DROP enabled.\n");
1663 LOG (GNUNET_ERROR_TYPE_WARNING, "This is NOT a good idea!\n");
1664 LOG (GNUNET_ERROR_TYPE_WARNING, "Remove DROP_PERCENT from config file.\n");
1665 LOG (GNUNET_ERROR_TYPE_WARNING, "**************************************\n");
1668 core_handle = GNUNET_CORE_connect (c, /* Main configuration */
1669 NULL, /* Closure passed to CADET functions */
1670 &core_init, /* Call core_init once connected */
1671 &core_connect, /* Handle connects */
1672 &core_disconnect, /* remove peers on disconnects */
1673 NULL, /* Don't notify about all incoming messages */
1674 GNUNET_NO, /* For header only in notification */
1675 NULL, /* Don't notify about all outbound messages */
1676 GNUNET_NO, /* For header-only out notification */
1677 core_handlers); /* Register these handlers */
1679 GNUNET_CONFIGURATION_get_value_yesno (c, "CADET", "DISABLE_TRY_CONNECT"))
1681 transport_handle = GNUNET_TRANSPORT_connect (c, &my_full_id, NULL, /* cls */
1682 /* Notify callbacks */
1687 LOG (GNUNET_ERROR_TYPE_WARNING, "**************************************\n");
1688 LOG (GNUNET_ERROR_TYPE_WARNING, "* DISABLE TRYING CONNECT in config *\n");
1689 LOG (GNUNET_ERROR_TYPE_WARNING, "* Use this only for test purposes. *\n");
1690 LOG (GNUNET_ERROR_TYPE_WARNING, "**************************************\n");
1691 transport_handle = NULL;
1696 if (NULL == core_handle)
1699 GNUNET_SCHEDULER_shutdown ();
1707 * Shut down the peer subsystem.
1712 GNUNET_CONTAINER_multipeermap_iterate (peers, &shutdown_tunnel, NULL);
1714 if (core_handle != NULL)
1716 GNUNET_CORE_disconnect (core_handle);
1719 if (transport_handle != NULL)
1721 GNUNET_TRANSPORT_disconnect (transport_handle);
1722 transport_handle = NULL;
1724 GNUNET_PEER_change_rc (myid, -1);
1729 * Retrieve the CadetPeer stucture associated with the peer, create one
1730 * and insert it in the appropriate structures if the peer is not known yet.
1732 * @param peer_id Full identity of the peer.
1734 * @return Existing or newly created peer structure.
1737 GCP_get (const struct GNUNET_PeerIdentity *peer_id)
1739 struct CadetPeer *peer;
1741 peer = GNUNET_CONTAINER_multipeermap_get (peers, peer_id);
1744 peer = GNUNET_new (struct CadetPeer);
1745 if (GNUNET_CONTAINER_multipeermap_size (peers) > max_peers)
1747 peer_delete_oldest ();
1749 GNUNET_CONTAINER_multipeermap_put (peers, peer_id, peer,
1750 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST);
1751 peer->id = GNUNET_PEER_intern (peer_id);
1753 peer->last_contact = GNUNET_TIME_absolute_get ();
1760 * Retrieve the CadetPeer stucture associated with the peer, create one
1761 * and insert it in the appropriate structures if the peer is not known yet.
1763 * @param peer Short identity of the peer.
1765 * @return Existing or newly created peer structure.
1768 GCP_get_short (const GNUNET_PEER_Id peer)
1770 return GCP_get (GNUNET_PEER_resolve2 (peer));
1775 * Try to connect to a peer on transport level.
1777 * @param cls Closure (peer).
1778 * @param tc TaskContext.
1781 try_connect (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1783 struct CadetPeer *peer = cls;
1785 if (0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
1788 GNUNET_TRANSPORT_try_connect (transport_handle,
1789 GNUNET_PEER_resolve2 (peer->id), NULL, NULL);
1794 * Try to establish a new connection to this peer (in its tunnel).
1795 * If the peer doesn't have any path to it yet, try to get one.
1796 * If the peer already has some path, send a CREATE CONNECTION towards it.
1798 * @param peer Peer to connect to.
1801 GCP_connect (struct CadetPeer *peer)
1803 struct CadetTunnel *t;
1804 struct CadetPeerPath *p;
1805 struct CadetConnection *c;
1808 LOG (GNUNET_ERROR_TYPE_DEBUG, "peer_connect towards %s\n", GCP_2s (peer));
1810 /* If we have a current hello, try to connect using it. */
1811 GCP_try_connect (peer);
1815 rerun_search = GNUNET_NO;
1817 if (NULL != peer->path_head)
1819 LOG (GNUNET_ERROR_TYPE_DEBUG, " some path exists\n");
1820 p = peer_get_best_path (peer);
1826 LOG (GNUNET_ERROR_TYPE_DEBUG, " path to use: %s\n", s);
1829 c = GCT_use_path (t, p);
1832 /* This case can happen when the path includes a first hop that is
1833 * not yet known to be connected.
1835 * This happens quite often during testing when running cadet
1836 * under valgrind: core connect notifications come very late and the
1837 * DHT result has already come and created a valid path.
1838 * In this case, the peer->connections hashmap will be NULL and
1839 * tunnel_use_path will not be able to create a connection from that
1842 * Re-running the DHT GET should give core time to callback.
1844 * GCT_use_path -> GCC_new -> register_neighbors takes care of
1845 * updating statistics about this issue.
1847 rerun_search = GNUNET_YES;
1851 GCC_send_create (c);
1857 LOG (GNUNET_ERROR_TYPE_DEBUG, " but is NULL, all paths are in use\n");
1861 if (GNUNET_YES == rerun_search)
1863 struct GNUNET_TIME_Relative delay;
1865 GCP_stop_search (peer);
1866 delay = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS, 100);
1867 peer->search_delayed = GNUNET_SCHEDULER_add_delayed (delay, &delayed_search,
1872 if (GNUNET_NO == is_searching (peer))
1873 GCP_start_search (peer);
1878 * Chech whether there is a direct (core level) connection to peer.
1880 * @param peer Peer to check.
1882 * @return #GNUNET_YES if there is a direct connection.
1885 GCP_is_neighbor (const struct CadetPeer *peer)
1887 struct CadetPeerPath *path;
1889 if (NULL == peer->connections)
1892 for (path = peer->path_head; NULL != path; path = path->next)
1894 if (3 > path->length)
1898 /* Is not a neighbor but connections is not NULL, probably disconnecting */
1904 * Create and initialize a new tunnel towards a peer, in case it has none.
1905 * In case the peer already has a tunnel, nothing is done.
1907 * Does not generate any traffic, just creates the local data structures.
1909 * @param peer Peer towards which to create the tunnel.
1912 GCP_add_tunnel (struct CadetPeer *peer)
1914 if (NULL != peer->tunnel)
1916 peer->tunnel = GCT_new (peer);
1921 * Add a connection to a neighboring peer.
1923 * Store that the peer is the first hop of the connection in one
1924 * direction and that on peer disconnect the connection must be
1925 * notified and destroyed, for it will no longer be valid.
1927 * @param peer Peer to add connection to.
1928 * @param c Connection to add.
1930 * @return GNUNET_OK on success.
1933 GCP_add_connection (struct CadetPeer *peer,
1934 struct CadetConnection *c)
1937 LOG (GNUNET_ERROR_TYPE_DEBUG, "adding connection %s\n", GCC_2s (c));
1938 LOG (GNUNET_ERROR_TYPE_DEBUG, "to peer %s\n", GCP_2s (peer));
1940 if (NULL == peer->connections)
1943 LOG (GNUNET_ERROR_TYPE_DEBUG,
1944 "Peer %s is not a neighbor!\n",
1946 return GNUNET_SYSERR;
1948 LOG (GNUNET_ERROR_TYPE_DEBUG,
1949 "peer %s ok, has %u connections.\n",
1950 GCP_2s (peer), GNUNET_CONTAINER_multihashmap_size (peer->connections));
1951 result = GNUNET_CONTAINER_multihashmap_put (peer->connections,
1954 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST);
1955 LOG (GNUNET_ERROR_TYPE_DEBUG,
1956 " now has %u connections.\n",
1957 GNUNET_CONTAINER_multihashmap_size (peer->connections));
1958 LOG (GNUNET_ERROR_TYPE_DEBUG, "result %u\n", result);
1965 * Add the path to the peer and update the path used to reach it in case this
1968 * @param peer Destination peer to add the path to.
1969 * @param path New path to add. Last peer must be the peer in arg 1.
1970 * Path will be either used of freed if already known.
1971 * @param trusted Do we trust that this path is real?
1973 * @return path if path was taken, pointer to existing duplicate if exists
1976 struct CadetPeerPath *
1977 GCP_add_path (struct CadetPeer *peer, struct CadetPeerPath *path,
1980 struct CadetPeerPath *aux;
1984 LOG (GNUNET_ERROR_TYPE_DEBUG, "adding path [%u] to peer %s\n",
1985 path->length, GCP_2s (peer));
1987 if (NULL == peer || NULL == path
1988 || path->peers[path->length - 1] != peer->id)
1991 path_destroy (path);
1995 for (l = 1; l < path->length; l++)
1997 if (path->peers[l] == myid)
1999 LOG (GNUNET_ERROR_TYPE_DEBUG, " shortening path by %u\n", l);
2000 for (l2 = 0; l2 < path->length - l; l2++)
2002 path->peers[l2] = path->peers[l + l2];
2006 path->peers = GNUNET_realloc (path->peers,
2007 path->length * sizeof (GNUNET_PEER_Id));
2011 LOG (GNUNET_ERROR_TYPE_DEBUG, " final length: %u\n", path->length);
2013 if (2 >= path->length && GNUNET_NO == trusted)
2015 /* Only allow CORE to tell us about direct paths */
2016 path_destroy (path);
2020 l = path_get_length (path);
2023 path_destroy (path);
2027 GNUNET_assert (peer->id == path->peers[path->length - 1]);
2028 for (aux = peer->path_head; aux != NULL; aux = aux->next)
2030 l2 = path_get_length (aux);
2033 LOG (GNUNET_ERROR_TYPE_DEBUG, " added\n");
2034 GNUNET_CONTAINER_DLL_insert_before (peer->path_head,
2035 peer->path_tail, aux, path);
2040 if (l2 == l && memcmp (path->peers, aux->peers, l) == 0)
2042 LOG (GNUNET_ERROR_TYPE_DEBUG, " already known\n");
2043 path_destroy (path);
2048 GNUNET_CONTAINER_DLL_insert_tail (peer->path_head, peer->path_tail,
2050 LOG (GNUNET_ERROR_TYPE_DEBUG, " added last\n");
2053 if (NULL != peer->tunnel
2054 && CONNECTIONS_PER_TUNNEL < GCT_count_connections (peer->tunnel))
2063 * Add the path to the origin peer and update the path used to reach it in case
2064 * this is the shortest.
2065 * The path is given in peer_info -> destination, therefore we turn the path
2066 * upside down first.
2068 * @param peer Peer to add the path to, being the origin of the path.
2069 * @param path New path to add after being inversed.
2070 * Path will be either used or freed.
2071 * @param trusted Do we trust that this path is real?
2073 * @return path if path was taken, pointer to existing duplicate if exists
2076 struct CadetPeerPath *
2077 GCP_add_path_to_origin (struct CadetPeer *peer,
2078 struct CadetPeerPath *path,
2084 return GCP_add_path (peer, path, trusted);
2089 * Adds a path to the info of all the peers in the path
2091 * @param p Path to process.
2092 * @param confirmed Whether we know if the path works or not.
2095 GCP_add_path_to_all (const struct CadetPeerPath *p, int confirmed)
2099 /* TODO: invert and add */
2100 for (i = 0; i < p->length && p->peers[i] != myid; i++) /* skip'em */ ;
2101 for (i++; i < p->length; i++)
2103 struct CadetPeer *aux;
2104 struct CadetPeerPath *copy;
2106 aux = GCP_get_short (p->peers[i]);
2107 copy = path_duplicate (p);
2108 copy->length = i + 1;
2109 GCP_add_path (aux, copy, p->length < 3 ? GNUNET_NO : confirmed);
2115 * Remove any path to the peer that has the extact same peers as the one given.
2117 * @param peer Peer to remove the path from.
2118 * @param path Path to remove. Is always destroyed .
2121 GCP_remove_path (struct CadetPeer *peer, struct CadetPeerPath *path)
2123 struct CadetPeerPath *iter;
2124 struct CadetPeerPath *next;
2126 GNUNET_assert (myid == path->peers[0]);
2127 GNUNET_assert (peer->id == path->peers[path->length - 1]);
2129 LOG (GNUNET_ERROR_TYPE_INFO, "Removing path %p (%u) from %s\n",
2130 path, path->length, GCP_2s (peer));
2132 for (iter = peer->path_head; NULL != iter; iter = next)
2135 if (0 == path_cmp (path, iter))
2137 GNUNET_CONTAINER_DLL_remove (peer->path_head, peer->path_tail, iter);
2139 path_destroy (iter);
2142 path_destroy (path);
2147 * Remove a connection from a neighboring peer.
2149 * @param peer Peer to remove connection from.
2150 * @param c Connection to remove.
2152 * @return GNUNET_OK on success.
2155 GCP_remove_connection (struct CadetPeer *peer,
2156 const struct CadetConnection *c)
2158 LOG (GNUNET_ERROR_TYPE_DEBUG, "removing connection %s\n", GCC_2s (c));
2159 LOG (GNUNET_ERROR_TYPE_DEBUG, "from peer %s\n", GCP_2s (peer));
2161 if (NULL == peer || NULL == peer->connections)
2163 LOG (GNUNET_ERROR_TYPE_DEBUG,
2164 "Peer %s is not a neighbor!\n",
2166 return GNUNET_SYSERR;
2168 LOG (GNUNET_ERROR_TYPE_DEBUG,
2169 "peer %s ok, has %u connections.\n",
2170 GCP_2s (peer), GNUNET_CONTAINER_multihashmap_size (peer->connections));
2172 return GNUNET_CONTAINER_multihashmap_remove (peer->connections,
2178 * Start the DHT search for new paths towards the peer: we don't have
2179 * enough good connections.
2181 * @param peer Destination peer.
2184 GCP_start_search (struct CadetPeer *peer)
2186 const struct GNUNET_PeerIdentity *id;
2187 struct CadetTunnel *t = peer->tunnel;
2189 if (NULL != peer->search_h)
2195 if (NULL != peer->search_delayed)
2196 GCP_stop_search (peer);
2198 id = GNUNET_PEER_resolve2 (peer->id);
2199 peer->search_h = GCD_search (id, &search_handler, peer);
2203 /* Why would we search for a peer with no tunnel towards it? */
2208 if (CADET_TUNNEL_NEW == GCT_get_cstate (t)
2209 || 0 == GCT_count_any_connections (t))
2211 GCT_change_cstate (t, CADET_TUNNEL_SEARCHING);
2217 * Stop the DHT search for new paths towards the peer: we already have
2218 * enough good connections.
2220 * @param peer Destination peer.
2223 GCP_stop_search (struct CadetPeer *peer)
2225 if (NULL != peer->search_h)
2227 GCD_search_stop (peer->search_h);
2228 peer->search_h = NULL;
2230 if (NULL != peer->search_delayed)
2232 GNUNET_SCHEDULER_cancel (peer->search_delayed);
2233 peer->search_delayed = NULL;
2239 * Get the Full ID of a peer.
2241 * @param peer Peer to get from.
2243 * @return Full ID of peer.
2245 const struct GNUNET_PeerIdentity *
2246 GCP_get_id (const struct CadetPeer *peer)
2248 return GNUNET_PEER_resolve2 (peer->id);
2253 * Get the Short ID of a peer.
2255 * @param peer Peer to get from.
2257 * @return Short ID of peer.
2260 GCP_get_short_id (const struct CadetPeer *peer)
2269 * If tunnel is NULL and there was a search active, stop it, as it's useless.
2275 GCP_set_tunnel (struct CadetPeer *peer, struct CadetTunnel *t)
2278 if (NULL == t && GNUNET_YES == is_searching (peer))
2280 GCP_stop_search (peer);
2286 * Get the tunnel towards a peer.
2288 * @param peer Peer to get from.
2290 * @return Tunnel towards peer.
2292 struct CadetTunnel *
2293 GCP_get_tunnel (const struct CadetPeer *peer)
2295 return peer->tunnel;
2300 * Set the hello message.
2302 * @param peer Peer whose message to set.
2303 * @param hello Hello message.
2306 GCP_set_hello (struct CadetPeer *peer, const struct GNUNET_HELLO_Message *hello)
2308 struct GNUNET_HELLO_Message *old;
2311 LOG (GNUNET_ERROR_TYPE_DEBUG, "set hello for %s\n", GCP_2s (peer));
2315 old = GCP_get_hello (peer);
2318 size = GNUNET_HELLO_size (hello);
2319 LOG (GNUNET_ERROR_TYPE_DEBUG, " new (%u bytes)\n", size);
2320 peer->hello = GNUNET_malloc (size);
2321 memcpy (peer->hello, hello, size);
2325 peer->hello = GNUNET_HELLO_merge (old, hello);
2326 LOG (GNUNET_ERROR_TYPE_DEBUG, " merge into %p (%u bytes)\n",
2327 peer->hello, GNUNET_HELLO_size (hello));
2334 * Get the hello message.
2336 * @param peer Peer whose message to get.
2338 * @return Hello message.
2340 struct GNUNET_HELLO_Message *
2341 GCP_get_hello (struct CadetPeer *peer)
2343 struct GNUNET_TIME_Absolute expiration;
2344 struct GNUNET_TIME_Relative remaining;
2346 if (NULL == peer->hello)
2349 expiration = GNUNET_HELLO_get_last_expiration (peer->hello);
2350 remaining = GNUNET_TIME_absolute_get_remaining (expiration);
2351 if (0 == remaining.rel_value_us)
2353 LOG (GNUNET_ERROR_TYPE_DEBUG, " get - hello expired on %s\n",
2354 GNUNET_STRINGS_absolute_time_to_string (expiration));
2355 GNUNET_free (peer->hello);
2363 * Try to connect to a peer on TRANSPORT level.
2365 * @param peer Peer to whom to connect.
2368 GCP_try_connect (struct CadetPeer *peer)
2370 struct GNUNET_HELLO_Message *hello;
2371 struct GNUNET_MessageHeader *mh;
2373 if (NULL == transport_handle)
2376 hello = GCP_get_hello (peer);
2380 mh = GNUNET_HELLO_get_header (hello);
2381 GNUNET_TRANSPORT_offer_hello (transport_handle, mh, try_connect, peer);
2386 * Check if the given ECDH key is correct for the peer.
2388 * This function caches the results if the key has been previoulsy checked,
2389 * otherwise checks that the key is signed with the peer's ID (EdDSA key).
2391 * TODO: save the cached public key to permanent storage / peerinfo.
2393 * @param peer Peer whose key to check.
2394 * @param key ECDH key to check.
2395 * @param purpose Purpose of the signature (followed by the key).
2396 * @param sig Signature with the peer's EdDSA key (PeerID).
2399 GCP_check_key (struct CadetPeer *peer,
2400 const struct GNUNET_CRYPTO_EcdhePublicKey *key,
2401 const struct GNUNET_CRYPTO_EccSignaturePurpose *purpose,
2402 const struct GNUNET_CRYPTO_EddsaSignature *sig)
2404 struct GNUNET_CRYPTO_EddsaPublicKey *pub;
2407 /* Is it the same as the cached key? */
2408 if (0 == memcmp (&peer->ax_key, key, sizeof (*key)))
2411 /* New key, verify. */
2412 pub = (struct GNUNET_CRYPTO_EddsaPublicKey *) GCP_get_id (peer);
2413 verified = GNUNET_CRYPTO_eddsa_verify (GNUNET_SIGNATURE_PURPOSE_CADET_AXKX,
2416 if (GNUNET_OK != verified)
2417 return GNUNET_SYSERR;
2419 /* Cache key for later. */
2420 peer->ax_key = *key;
2426 * Get the Identity ECDH key of the peer.
2428 * @param peer Peer whose key to get.
2430 * @return Peer's permanent ECDH key (might be all 0: unknown).
2433 struct GNUNET_CRYPTO_EcdhePublicKey *
2434 GCP_get_ecdh_key (struct CadetPeer *peer)
2436 return &peer->ax_key;
2441 * Notify a peer that a link between two other peers is broken. If any path
2442 * used that link, eliminate it.
2444 * @param peer Peer affected by the change.
2445 * @param peer1 Peer whose link is broken.
2446 * @param peer2 Peer whose link is broken.
2449 GCP_notify_broken_link (struct CadetPeer *peer,
2450 struct GNUNET_PeerIdentity *peer1,
2451 struct GNUNET_PeerIdentity *peer2)
2453 struct CadetPeerPath *iter;
2454 struct CadetPeerPath *next;
2459 p1 = GNUNET_PEER_search (peer1);
2460 p2 = GNUNET_PEER_search (peer2);
2462 LOG (GNUNET_ERROR_TYPE_DEBUG, "Link %u-%u broken\n", p1, p2);
2463 if (0 == p1 || 0 == p2)
2465 /* We don't even know them */
2469 for (iter = peer->path_head; NULL != iter; iter = next)
2472 for (i = 0; i < iter->length - 1; i++)
2474 if ((iter->peers[i] == p1 && iter->peers[i + 1] == p2)
2475 || (iter->peers[i] == p2 && iter->peers[i + 1] == p1))
2480 LOG (GNUNET_ERROR_TYPE_DEBUG, " - invalidating %s\n", s);
2483 path_invalidate (iter);
2491 * Count the number of known paths toward the peer.
2493 * @param peer Peer to get path info.
2495 * @return Number of known paths.
2498 GCP_count_paths (const struct CadetPeer *peer)
2500 struct CadetPeerPath *iter;
2503 for (iter = peer->path_head, i = 0; NULL != iter; iter = iter->next)
2511 * Iterate all known peers.
2513 * @param iter Iterator.
2514 * @param cls Closure for @c iter.
2517 GCP_iterate_all (GNUNET_CONTAINER_PeerMapIterator iter, void *cls)
2519 GNUNET_CONTAINER_multipeermap_iterate (peers, iter, cls);
2524 * Get the static string for a peer ID.
2528 * @return Static string for it's ID.
2531 GCP_2s (const struct CadetPeer *peer)
2535 return GNUNET_i2s (GNUNET_PEER_resolve2 (peer->id));