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21 * @file cadet/gnunet-service-cadet_peer.c
22 * @brief GNUnet CADET service connection handling
23 * @author Bartlomiej Polot
26 #include "gnunet_util_lib.h"
27 #include "gnunet_signatures.h"
28 #include "gnunet_transport_service.h"
29 #include "gnunet_ats_service.h"
30 #include "gnunet_core_service.h"
31 #include "gnunet_statistics_service.h"
32 #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.
120 * Struct containing all information regarding a given peer
130 * Last time we heard from this peer
132 struct GNUNET_TIME_Absolute last_contact;
135 * Paths to reach the peer, ordered by ascending hop count
137 struct CadetPeerPath *path_head;
140 * Paths to reach the peer, ordered by ascending hop count
142 struct CadetPeerPath *path_tail;
145 * Handle to stop the DHT search for paths to this peer
147 struct GCD_search_handle *search_h;
150 * Handle to stop the DHT search for paths to this peer
152 struct GNUNET_SCHEDULER_Task *search_delayed;
155 * Tunnel to this peer, if any.
157 struct CadetTunnel *tunnel;
160 * Connections that go through this peer; indexed by tid.
162 struct GNUNET_CONTAINER_MultiHashMap *connections;
165 * Handle for queued transmissions
167 struct GNUNET_CORE_TransmitHandle *core_transmit;
172 struct GNUNET_TIME_Absolute tmt_time;
175 * Transmission queue to core DLL head
177 struct CadetPeerQueue *queue_head;
180 * Transmission queue to core DLL tail
182 struct CadetPeerQueue *queue_tail;
185 * How many messages are in the queue to this peer.
187 unsigned int queue_n;
192 struct GNUNET_HELLO_Message* hello;
195 * Handle to us offering the HELLO to the transport.
197 struct GNUNET_TRANSPORT_OfferHelloHandle *hello_offer;
200 * Handle to our ATS request asking ATS to suggest an address
201 * to TRANSPORT for this peer (to establish a direct link).
203 struct GNUNET_ATS_ConnectivitySuggestHandle *connectivity_suggestion;
208 /******************************************************************************/
209 /******************************* GLOBALS ***********************************/
210 /******************************************************************************/
213 * Global handle to the statistics service.
215 extern struct GNUNET_STATISTICS_Handle *stats;
218 * Local peer own ID (full value).
220 extern struct GNUNET_PeerIdentity my_full_id;
223 * Local peer own ID (short)
225 extern GNUNET_PEER_Id myid;
228 * Peers known, indexed by PeerIdentity, values of type `struct CadetPeer`.
230 static struct GNUNET_CONTAINER_MultiPeerMap *peers;
233 * How many peers do we want to remember?
235 static unsigned long long max_peers;
238 * Percentage of messages that will be dropped (for test purposes only).
240 static unsigned long long drop_percent;
243 * Handle to communicate with CORE.
245 static struct GNUNET_CORE_Handle *core_handle;
248 * Handle to communicate with ATS.
250 static struct GNUNET_ATS_ConnectivityHandle *ats_ch;
253 * Handle to try to start new connections.
255 static struct GNUNET_TRANSPORT_Handle *transport_handle;
260 static int in_shutdown;
263 /******************************************************************************/
264 /***************************** DEBUG *********************************/
265 /******************************************************************************/
268 * Log all kinds of info about the queueing status of a peer.
270 * @param p Peer whose queue to show.
271 * @param level Error level to use for logging.
274 queue_debug (const struct CadetPeer *p, enum GNUNET_ErrorType level)
276 struct GNUNET_TIME_Relative core_wait_time;
277 struct CadetPeerQueue *q;
280 do_log = GNUNET_get_log_call_status (level & (~GNUNET_ERROR_TYPE_BULK),
282 __FILE__, __FUNCTION__, __LINE__);
286 LOG2 (level, "QQQ Message queue towards %s\n", GCP_2s (p));
287 LOG2 (level, "QQQ queue length: %u\n", p->queue_n);
288 LOG2 (level, "QQQ core tmt rdy: %p\n", p->core_transmit);
289 if (NULL != p->core_transmit)
291 core_wait_time = GNUNET_TIME_absolute_get_duration (p->tmt_time);
292 LOG2 (level, "QQQ core called %s ago\n",
293 GNUNET_STRINGS_relative_time_to_string (core_wait_time, GNUNET_NO));
295 for (q = p->queue_head; NULL != q; q = q->next)
297 LOG2 (level, "QQQ - %s %s on %s\n",
298 GC_m2s (q->type), GC_f2s (q->fwd), GCC_2s (q->c));
299 LOG2 (level, "QQQ payload %s, %u\n",
300 GC_m2s (q->payload_type), q->payload_id);
301 LOG2 (level, "QQQ size: %u bytes\n", q->size);
304 LOG2 (level, "QQQ End queue towards %s\n", GCP_2s (p));
309 * Log all kinds of info about a peer.
314 GCP_debug (const struct CadetPeer *p, enum GNUNET_ErrorType level)
316 struct CadetPeerPath *path;
320 do_log = GNUNET_get_log_call_status (level & (~GNUNET_ERROR_TYPE_BULK),
322 __FILE__, __FUNCTION__, __LINE__);
328 LOG2 (level, "PPP DEBUG PEER NULL\n");
332 LOG2 (level, "PPP DEBUG PEER %s\n", GCP_2s (p));
333 LOG2 (level, "PPP last contact %s\n",
334 GNUNET_STRINGS_absolute_time_to_string (p->last_contact));
335 for (path = p->path_head; NULL != path; path = path->next)
340 LOG2 (level, "PPP path: %s\n", s);
344 LOG2 (level, "PPP core transmit handle %p\n", p->core_transmit);
345 LOG2 (level, "PPP DHT GET handle %p\n", p->search_h);
347 if (NULL != p->connections)
348 conns += GNUNET_CONTAINER_multihashmap_size (p->connections);
349 LOG2 (level, "PPP # connections over link to peer: %u\n", conns);
350 queue_debug (p, level);
351 LOG2 (level, "PPP DEBUG END\n");
355 /******************************************************************************/
356 /***************************** CORE HELPERS *********************************/
357 /******************************************************************************/
361 * Iterator to notify all connections of a broken link. Mark connections
362 * to destroy after all traffic has been sent.
364 * @param cls Closure (disconnected peer).
365 * @param key Current key code (peer id).
366 * @param value Value in the hash map (connection).
368 * @return #GNUNET_YES to continue to iterate.
371 notify_broken (void *cls,
372 const struct GNUNET_HashCode *key,
375 struct CadetPeer *peer = cls;
376 struct CadetConnection *c = value;
378 LOG (GNUNET_ERROR_TYPE_DEBUG,
379 "Notifying %s due to %s disconnect\n",
380 GCC_2s (c), GCP_2s (peer));
381 GCC_neighbor_disconnected (c, peer);
387 * Remove the direct path to the peer.
389 * @param peer Peer to remove the direct path from.
391 static struct CadetPeerPath *
392 pop_direct_path (struct CadetPeer *peer)
394 struct CadetPeerPath *iter;
396 for (iter = peer->path_head; NULL != iter; iter = iter->next)
398 if (2 >= iter->length)
400 GNUNET_CONTAINER_DLL_remove (peer->path_head,
410 /******************************************************************************/
411 /***************************** CORE CALLBACKS *********************************/
412 /******************************************************************************/
416 * Method called whenever a given peer connects.
419 * @param peer peer identity this notification is about
422 core_connect (void *cls,
423 const struct GNUNET_PeerIdentity *peer)
425 struct CadetPeer *neighbor;
426 struct CadetPeerPath *path;
429 GCC_check_connections ();
430 GNUNET_snprintf (own_id,
433 GNUNET_i2s (&my_full_id));
434 neighbor = GCP_get (peer, GNUNET_YES);
435 if (myid == neighbor->id)
437 LOG (GNUNET_ERROR_TYPE_INFO,
438 "CONNECTED %s (self)\n",
444 LOG (GNUNET_ERROR_TYPE_INFO,
445 "CONNECTED %s <= %s\n",
449 path->peers[1] = neighbor->id;
450 GNUNET_PEER_change_rc (neighbor->id, 1);
452 path->peers[0] = myid;
453 GNUNET_PEER_change_rc (myid, 1);
454 GCP_add_path (neighbor, path, GNUNET_YES);
456 GNUNET_assert (NULL == neighbor->connections);
457 neighbor->connections = GNUNET_CONTAINER_multihashmap_create (16, GNUNET_NO);
458 GNUNET_assert (NULL != neighbor->connections);
460 GNUNET_STATISTICS_update (stats,
465 if ( (NULL != GCP_get_tunnel (neighbor)) &&
466 (0 > GNUNET_CRYPTO_cmp_peer_identity (&my_full_id, peer)) )
467 GCP_connect (neighbor);
468 GCC_check_connections ();
473 * Method called whenever a peer disconnects.
476 * @param peer peer identity this notification is about
479 core_disconnect (void *cls,
480 const struct GNUNET_PeerIdentity *peer)
483 struct CadetPeerPath *direct_path;
486 GCC_check_connections ();
487 strncpy (own_id, GNUNET_i2s (&my_full_id), 16);
489 p = GNUNET_CONTAINER_multipeermap_get (peers, peer);
492 GNUNET_break (GNUNET_YES == in_shutdown);
496 LOG (GNUNET_ERROR_TYPE_INFO,
497 "DISCONNECTED %s (self)\n",
500 LOG (GNUNET_ERROR_TYPE_INFO,
501 "DISCONNECTED %s <= %s\n",
502 own_id, GNUNET_i2s (peer));
503 direct_path = pop_direct_path (p);
504 GNUNET_CONTAINER_multihashmap_iterate (p->connections,
507 GNUNET_CONTAINER_multihashmap_destroy (p->connections);
508 p->connections = NULL;
509 if (NULL != p->core_transmit)
511 GNUNET_CORE_notify_transmit_ready_cancel (p->core_transmit);
512 p->core_transmit = NULL;
513 p->tmt_time.abs_value_us = 0;
515 GNUNET_STATISTICS_update (stats,
519 path_destroy (direct_path);
520 GCC_check_connections ();
525 * Functions to handle messages from core
527 static struct GNUNET_CORE_MessageHandler core_handlers[] = {
528 {&GCC_handle_create, GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE, 0},
529 {&GCC_handle_confirm, GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK,
530 sizeof (struct GNUNET_CADET_ConnectionACK)},
531 {&GCC_handle_broken, GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN,
532 sizeof (struct GNUNET_CADET_ConnectionBroken)},
533 {&GCC_handle_destroy, GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY,
534 sizeof (struct GNUNET_CADET_ConnectionDestroy)},
535 {&GCC_handle_ack, GNUNET_MESSAGE_TYPE_CADET_ACK,
536 sizeof (struct GNUNET_CADET_ACK)},
537 {&GCC_handle_poll, GNUNET_MESSAGE_TYPE_CADET_POLL,
538 sizeof (struct GNUNET_CADET_Poll)},
539 {&GCC_handle_kx, GNUNET_MESSAGE_TYPE_CADET_KX, 0},
540 {&GCC_handle_encrypted, GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED, 0},
541 {&GCC_handle_encrypted, GNUNET_MESSAGE_TYPE_CADET_AX, 0},
547 * To be called on core init/fail.
549 * @param cls Closure (config)
550 * @param identity the public identity of this peer
553 core_init (void *cls,
554 const struct GNUNET_PeerIdentity *identity)
556 const struct GNUNET_CONFIGURATION_Handle *c = cls;
559 LOG (GNUNET_ERROR_TYPE_DEBUG, "Core init\n");
560 if (0 != memcmp (identity, &my_full_id, sizeof (my_full_id)))
562 LOG (GNUNET_ERROR_TYPE_ERROR, _("Wrong CORE service\n"));
563 LOG (GNUNET_ERROR_TYPE_ERROR, " core id %s\n", GNUNET_i2s (identity));
564 LOG (GNUNET_ERROR_TYPE_ERROR, " my id %s\n", GNUNET_i2s (&my_full_id));
565 GNUNET_CORE_disconnect (core_handle);
566 core_handle = GNUNET_CORE_connect (c, /* Main configuration */
567 NULL, /* Closure passed to CADET functions */
568 &core_init, /* Call core_init once connected */
569 &core_connect, /* Handle connects */
570 &core_disconnect, /* remove peers on disconnects */
571 NULL, /* Don't notify about all incoming messages */
572 GNUNET_NO, /* For header only in notification */
573 NULL, /* Don't notify about all outbound messages */
574 GNUNET_NO, /* For header-only out notification */
575 core_handlers); /* Register these handlers */
584 * Core callback to write a pre-constructed data packet to core buffer
586 * @param cls Closure (CadetTransmissionDescriptor with data in "data" member).
587 * @param size Number of bytes available in buf.
588 * @param buf Where the to write the message.
590 * @return number of bytes written to buf
593 send_core_data_raw (void *cls, size_t size, void *buf)
595 struct GNUNET_MessageHeader *msg = cls;
598 GNUNET_assert (NULL != msg);
599 total_size = ntohs (msg->size);
601 if (total_size > size)
606 memcpy (buf, msg, total_size);
613 * Function to send a create connection message to a peer.
615 * @param c Connection to create.
616 * @param size number of bytes available in buf
617 * @param buf where the callee should write the message
618 * @return number of bytes written to buf
621 send_core_connection_create (struct CadetConnection *c, size_t size, void *buf)
623 struct GNUNET_CADET_ConnectionCreate *msg;
624 struct GNUNET_PeerIdentity *peer_ptr;
625 const struct CadetPeerPath *p = GCC_get_path (c);
632 LOG (GNUNET_ERROR_TYPE_DEBUG, "Sending CONNECTION CREATE...\n");
634 sizeof (struct GNUNET_CADET_ConnectionCreate) +
635 p->length * sizeof (struct GNUNET_PeerIdentity);
637 if (size < size_needed || NULL == buf)
642 msg = (struct GNUNET_CADET_ConnectionCreate *) buf;
643 msg->header.size = htons (size_needed);
644 msg->header.type = htons (GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE);
645 msg->cid = *GCC_get_id (c);
647 peer_ptr = (struct GNUNET_PeerIdentity *) &msg[1];
648 for (i = 0; i < p->length; i++)
650 GNUNET_PEER_resolve (p->peers[i], peer_ptr++);
653 LOG (GNUNET_ERROR_TYPE_DEBUG,
654 "CONNECTION CREATE (%u bytes long) sent!\n",
661 * Creates a path ack message in buf and frees all unused resources.
663 * @param c Connection to send an ACK on.
664 * @param size number of bytes available in buf
665 * @param buf where the callee should write the message
667 * @return number of bytes written to buf
670 send_core_connection_ack (struct CadetConnection *c, size_t size, void *buf)
672 struct GNUNET_CADET_ConnectionACK *msg = buf;
674 LOG (GNUNET_ERROR_TYPE_DEBUG, "Sending CONNECTION ACK...\n");
675 if (sizeof (struct GNUNET_CADET_ConnectionACK) > size)
680 msg->header.size = htons (sizeof (struct GNUNET_CADET_ConnectionACK));
681 msg->header.type = htons (GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK);
682 msg->cid = *GCC_get_id (c);
684 LOG (GNUNET_ERROR_TYPE_DEBUG, "CONNECTION ACK sent!\n");
685 return sizeof (struct GNUNET_CADET_ConnectionACK);
689 /******************************************************************************/
690 /******************************** STATIC ***********************************/
691 /******************************************************************************/
695 * Get priority for a queued message.
697 * @param q Queued message
699 * @return CORE priority to use.
701 static enum GNUNET_CORE_Priority
702 get_priority (struct CadetPeerQueue *q)
704 enum GNUNET_CORE_Priority low;
705 enum GNUNET_CORE_Priority high;
710 return GNUNET_CORE_PRIO_BACKGROUND;
713 /* Relayed traffic has lower priority, our own traffic has higher */
714 if (NULL == q->c || GNUNET_NO == GCC_is_origin (q->c, q->fwd))
716 low = GNUNET_CORE_PRIO_BEST_EFFORT;
717 high = GNUNET_CORE_PRIO_URGENT;
721 low = GNUNET_CORE_PRIO_URGENT;
722 high = GNUNET_CORE_PRIO_CRITICAL_CONTROL;
725 /* Bulky payload has lower priority, control traffic has higher. */
726 if (GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED == q->type
727 || GNUNET_MESSAGE_TYPE_CADET_AX == q->type)
735 * Destroy the peer_info and free any allocated resources linked to it
737 * @param peer The peer_info to destroy.
738 * @return #GNUNET_OK on success
741 peer_destroy (struct CadetPeer *peer)
743 struct GNUNET_PeerIdentity id;
744 struct CadetPeerPath *p;
745 struct CadetPeerPath *nextp;
747 GNUNET_PEER_resolve (peer->id, &id);
748 GNUNET_PEER_change_rc (peer->id, -1);
750 LOG (GNUNET_ERROR_TYPE_INFO,
751 "destroying peer %s\n",
755 GNUNET_CONTAINER_multipeermap_remove (peers, &id, peer))
758 LOG (GNUNET_ERROR_TYPE_WARNING, " peer not in peermap!!\n");
760 GCP_stop_search (peer);
765 GNUNET_CONTAINER_DLL_remove (peer->path_head,
771 if (NULL != peer->tunnel)
772 GCT_destroy_empty (peer->tunnel);
773 if (NULL != peer->connections)
775 GNUNET_assert (0 == GNUNET_CONTAINER_multihashmap_size (peer->connections));
776 GNUNET_CONTAINER_multihashmap_destroy (peer->connections);
778 if (NULL != peer->core_transmit)
779 GNUNET_CORE_notify_transmit_ready_cancel (peer->core_transmit);
780 if (NULL != peer->hello_offer)
782 GNUNET_TRANSPORT_offer_hello_cancel (peer->hello_offer);
783 peer->hello_offer = NULL;
785 if (NULL != peer->connectivity_suggestion)
787 GNUNET_ATS_connectivity_suggest_cancel (peer->connectivity_suggestion);
788 peer->connectivity_suggestion = NULL;
790 while (NULL != peer->queue_head)
792 GCP_queue_destroy (peer->queue_head, GNUNET_YES, GNUNET_NO, 0);
794 GNUNET_free_non_null (peer->hello);
801 * Iterator over peer hash map entries to destroy the peer during in_shutdown.
804 * @param key current key code
805 * @param value value in the hash map
806 * @return #GNUNET_YES if we should continue to iterate,
810 shutdown_peer (void *cls,
811 const struct GNUNET_PeerIdentity *key,
814 struct CadetPeer *p = value;
815 struct CadetTunnel *t = p->tunnel;
816 LOG (GNUNET_ERROR_TYPE_DEBUG, " shutting down %s\n", GCP_2s (p));
827 * Check if peer is searching for a path (either active or delayed search).
829 * @param peer Peer to check
830 * @return #GNUNET_YES if there is a search active.
831 * #GNUNET_NO otherwise.
834 is_searching (const struct CadetPeer *peer)
836 return ( (NULL == peer->search_h) &&
837 (NULL == peer->search_delayed) ) ?
838 GNUNET_NO : GNUNET_YES;
843 * @brief Start a search for a peer.
845 * @param cls Closure (Peer to search for).
848 delayed_search (void *cls)
850 struct CadetPeer *peer = cls;
852 peer->search_delayed = NULL;
853 GCC_check_connections ();
854 GCP_start_search (peer);
855 GCC_check_connections ();
860 * Returns if peer is used (has a tunnel or is neighbor).
862 * @param peer Peer to check.
863 * @return #GNUNET_YES if peer is in use.
866 peer_is_used (struct CadetPeer *peer)
868 struct CadetPeerPath *p;
870 if (NULL != peer->tunnel)
873 for (p = peer->path_head; NULL != p; p = p->next)
883 * Iterator over all the peers to get the oldest timestamp.
885 * @param cls Closure (unsued).
886 * @param key ID of the peer.
887 * @param value Peer_Info of the peer.
890 peer_get_oldest (void *cls,
891 const struct GNUNET_PeerIdentity *key,
894 struct CadetPeer *p = value;
895 struct GNUNET_TIME_Absolute *abs = cls;
897 /* Don't count active peers */
898 if (GNUNET_YES == peer_is_used (p))
901 if (abs->abs_value_us < p->last_contact.abs_value_us)
902 abs->abs_value_us = p->last_contact.abs_value_us;
909 * Iterator over all the peers to remove the oldest entry.
911 * @param cls Closure (unsued).
912 * @param key ID of the peer.
913 * @param value Peer_Info of the peer.
916 peer_timeout (void *cls,
917 const struct GNUNET_PeerIdentity *key,
920 struct CadetPeer *p = value;
921 struct GNUNET_TIME_Absolute *abs = cls;
923 LOG (GNUNET_ERROR_TYPE_WARNING,
924 "peer %s timeout\n", GNUNET_i2s (key));
926 if (p->last_contact.abs_value_us == abs->abs_value_us &&
927 GNUNET_NO == peer_is_used (p))
937 * Delete oldest unused peer.
940 peer_delete_oldest (void)
942 struct GNUNET_TIME_Absolute abs;
944 abs = GNUNET_TIME_UNIT_FOREVER_ABS;
946 GNUNET_CONTAINER_multipeermap_iterate (peers,
949 GNUNET_CONTAINER_multipeermap_iterate (peers,
956 * Choose the best (yet unused) path towards a peer,
957 * considering the tunnel properties.
959 * @param peer The destination peer.
960 * @return Best current known path towards the peer, if any.
962 static struct CadetPeerPath *
963 peer_get_best_path (const struct CadetPeer *peer)
965 struct CadetPeerPath *best_p;
966 struct CadetPeerPath *p;
967 unsigned int best_cost;
970 best_cost = UINT_MAX;
972 for (p = peer->path_head; NULL != p; p = p->next)
974 if (GNUNET_NO == path_is_valid (p))
975 continue; /* Don't use invalid paths. */
976 if (GNUNET_YES == GCT_is_path_used (peer->tunnel, p))
977 continue; /* If path is already in use, skip it. */
979 if ((cost = GCT_get_path_cost (peer->tunnel, p)) < best_cost)
990 * Is this queue element sendable?
992 * - All management traffic is always sendable.
993 * - For payload traffic, check the connection flow control.
995 * @param q Queue element to inspect.
996 * @return #GNUNET_YES if it is sendable, #GNUNET_NO otherwise.
999 queue_is_sendable (struct CadetPeerQueue *q)
1001 /* Is PID-independent? */
1004 case GNUNET_MESSAGE_TYPE_CADET_ACK:
1005 case GNUNET_MESSAGE_TYPE_CADET_POLL:
1006 case GNUNET_MESSAGE_TYPE_CADET_KX:
1007 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE:
1008 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK:
1009 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY:
1010 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN:
1013 case GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED:
1014 case GNUNET_MESSAGE_TYPE_CADET_AX:
1021 return GCC_is_sendable (q->c, q->fwd);
1026 * Get first sendable message.
1028 * @param peer The destination peer.
1030 * @return First transmittable message, if any. Otherwise, NULL.
1032 static struct CadetPeerQueue *
1033 peer_get_first_message (const struct CadetPeer *peer)
1035 struct CadetPeerQueue *q;
1037 for (q = peer->queue_head; NULL != q; q = q->next)
1039 LOG (GNUNET_ERROR_TYPE_DEBUG, "Checking q:%p on c:%s\n", q, GCC_2s (q->c));
1040 if (queue_is_sendable (q))
1049 * Function to process paths received for a new peer addition. The recorded
1050 * paths form the initial tunnel, which can be optimized later.
1051 * Called on each result obtained for the DHT search.
1053 * @param cls Closure (peer towards a path has been found).
1054 * @param path Path created from the DHT query. Will be freed afterwards.
1057 search_handler (void *cls, const struct CadetPeerPath *path)
1059 struct CadetPeer *peer = cls;
1060 unsigned int connection_count;
1062 GCC_check_connections ();
1063 GCP_add_path_to_all (path, GNUNET_NO);
1065 /* Count connections */
1066 connection_count = GCT_count_connections (peer->tunnel);
1068 /* If we already have our minimum (or more) connections, it's enough */
1069 if (CONNECTIONS_PER_TUNNEL <= connection_count)
1071 GCC_check_connections ();
1075 if (CADET_TUNNEL_SEARCHING == GCT_get_cstate (peer->tunnel))
1077 LOG (GNUNET_ERROR_TYPE_DEBUG, " ... connect!\n");
1080 GCC_check_connections ();
1085 * Adjust core requested size to accomodate an ACK.
1087 * @param message_size Requested size.
1089 * @return Size enough to fit @c message_size and an ACK.
1092 get_core_size (size_t message_size)
1094 return message_size + sizeof (struct GNUNET_CADET_ACK);
1098 * Test if a message type is connection management traffic
1099 * or regular payload traffic.
1101 * @param type Message type.
1103 * @return #GNUNET_YES if connection management, #GNUNET_NO otherwise.
1106 is_connection_management (uint16_t type)
1108 return type == GNUNET_MESSAGE_TYPE_CADET_ACK ||
1109 type == GNUNET_MESSAGE_TYPE_CADET_POLL;
1114 * Fill a core buffer with the appropriate data for the queued message.
1116 * @param queue Queue element for the message.
1117 * @param buf Core buffer to fill.
1118 * @param size Size remaining in @c buf.
1119 * @param[out] pid In case its an encrypted payload, set payload.
1121 * @return Bytes written to @c buf.
1124 fill_buf (struct CadetPeerQueue *queue, void *buf, size_t size, uint32_t *pid)
1126 struct CadetConnection *c = queue->c;
1129 switch (queue->type)
1131 case GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED:
1132 *pid = GCC_get_pid (queue->c, queue->fwd);
1133 LOG (GNUNET_ERROR_TYPE_DEBUG, " otr payload ID %u\n", *pid);
1134 msg_size = send_core_data_raw (queue->cls, size, buf);
1135 ((struct GNUNET_CADET_Encrypted *) buf)->pid = htonl (*pid);
1137 case GNUNET_MESSAGE_TYPE_CADET_AX:
1138 *pid = GCC_get_pid (queue->c, queue->fwd);
1139 LOG (GNUNET_ERROR_TYPE_DEBUG, " ax payload ID %u\n", *pid);
1140 msg_size = send_core_data_raw (queue->cls, size, buf);
1141 ((struct GNUNET_CADET_AX *) buf)->pid = htonl (*pid);
1143 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY:
1144 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN:
1145 case GNUNET_MESSAGE_TYPE_CADET_KX:
1146 case GNUNET_MESSAGE_TYPE_CADET_ACK:
1147 case GNUNET_MESSAGE_TYPE_CADET_POLL:
1148 LOG (GNUNET_ERROR_TYPE_DEBUG, " raw %s\n", GC_m2s (queue->type));
1149 msg_size = send_core_data_raw (queue->cls, size, buf);
1151 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE:
1152 LOG (GNUNET_ERROR_TYPE_DEBUG, " path create\n");
1153 if (GCC_is_origin (c, GNUNET_YES))
1154 msg_size = send_core_connection_create (c, size, buf);
1156 msg_size = send_core_data_raw (queue->cls, size, buf);
1158 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK:
1159 LOG (GNUNET_ERROR_TYPE_DEBUG, " path ack\n");
1160 if (GCC_is_origin (c, GNUNET_NO) ||
1161 GCC_is_origin (c, GNUNET_YES))
1163 msg_size = send_core_connection_ack (c, size, buf);
1167 msg_size = send_core_data_raw (queue->cls, size, buf);
1170 case GNUNET_MESSAGE_TYPE_CADET_DATA:
1171 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_CREATE:
1172 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_DESTROY:
1173 /* This should be encapsulted */
1179 LOG (GNUNET_ERROR_TYPE_WARNING, " type unknown: %u\n", queue->type);
1183 GNUNET_assert (size >= msg_size);
1190 * Debug function should NEVER return true in production code, useful to
1191 * simulate losses for testcases.
1193 * @param q Queue handle with info about the message.
1195 * @return #GNUNET_YES or #GNUNET_NO with the decision to drop.
1198 should_I_drop (struct CadetPeerQueue *q)
1200 if (0 == drop_percent)
1203 if (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, 101) < drop_percent)
1211 * Core callback to write a queued packet to core buffer
1213 * @param cls Closure (peer info).
1214 * @param size Number of bytes available in buf.
1215 * @param buf Where the to write the message.
1217 * @return number of bytes written to buf
1220 queue_send (void *cls, size_t size, void *buf)
1222 struct CadetPeer *peer = cls;
1223 struct CadetConnection *c;
1224 struct CadetPeerQueue *queue;
1225 struct GNUNET_TIME_Relative core_wait_time;
1227 const struct GNUNET_PeerIdentity *dst_id;
1234 GCC_check_connections ();
1235 LOG (GNUNET_ERROR_TYPE_DEBUG, "\n");
1236 LOG (GNUNET_ERROR_TYPE_DEBUG, "\n");
1237 LOG (GNUNET_ERROR_TYPE_DEBUG, "Queue send towards %s (max %u)\n",
1238 GCP_2s (peer), size);
1240 /* Sanity checking */
1241 if (NULL == buf || 0 == size)
1243 LOG (GNUNET_ERROR_TYPE_DEBUG, " not allowed/\n");
1244 if (GNUNET_NO == in_shutdown)
1246 queue = peer_get_first_message (peer);
1249 peer->core_transmit = NULL;
1250 peer->tmt_time.abs_value_us = 0;
1251 GCC_check_connections ();
1254 dst_id = GNUNET_PEER_resolve2 (peer->id);
1255 peer->core_transmit =
1256 GNUNET_CORE_notify_transmit_ready (core_handle,
1257 GNUNET_NO, get_priority (queue),
1258 GNUNET_TIME_UNIT_FOREVER_REL,
1260 get_core_size (queue->size),
1263 peer->tmt_time = GNUNET_TIME_absolute_get ();
1267 peer->core_transmit = NULL;
1268 peer->tmt_time.abs_value_us = 0;
1270 GCC_check_connections ();
1279 peer->core_transmit = NULL;
1280 queue = peer_get_first_message (peer);
1283 GNUNET_break (0); /* Core tmt_rdy should've been canceled */
1284 peer->tmt_time.abs_value_us = 0;
1287 core_wait_time = GNUNET_TIME_absolute_get_duration (peer->tmt_time);
1288 wait_s = GNUNET_STRINGS_relative_time_to_string (core_wait_time, GNUNET_YES);
1289 if (core_wait_time.rel_value_us >= 1000000)
1291 LOG (GNUNET_ERROR_TYPE_WARNING,
1292 " %s: core wait time %s (> 1 second) for %u bytes\n",
1293 GCP_2s (peer), wait_s, queue->size);
1295 peer->tmt_time.abs_value_us = 0;
1297 /* Copy all possible messages to the core buffer */
1298 while (NULL != queue && rest >= queue->size)
1302 LOG (GNUNET_ERROR_TYPE_DEBUG, " on conn %s %s\n",
1303 GCC_2s (c), GC_f2s(queue->fwd));
1304 LOG (GNUNET_ERROR_TYPE_DEBUG, " size %u ok (%u/%u)\n",
1305 queue->size, total_size, size);
1307 msg_size = fill_buf (queue, (void *) dst, size, &pid);
1309 if (should_I_drop (queue))
1311 LOG (GNUNET_ERROR_TYPE_WARNING, "DD %s (%s %u) on conn %s %s\n",
1312 GC_m2s (queue->type), GC_m2s (queue->payload_type),
1313 queue->payload_id, GCC_2s (c), GC_f2s (queue->fwd));
1318 LOG (GNUNET_ERROR_TYPE_INFO,
1319 ">>> %s (%s %4u) on conn %s (%p) %s [%5u], after %s\n",
1320 GC_m2s (queue->type), GC_m2s (queue->payload_type),
1321 queue->payload_id, GCC_2s (c), c,
1322 GC_f2s (queue->fwd), msg_size, wait_s);
1324 total_size += msg_size;
1326 dst = &dst[msg_size];
1329 /* Free queue, but cls was freed by send_core_* in fill_buf. */
1330 (void) GCP_queue_destroy (queue, GNUNET_NO, GNUNET_YES, pid);
1333 queue = peer_get_first_message (peer);
1336 /* If more data in queue, send next */
1339 LOG (GNUNET_ERROR_TYPE_DEBUG, " more data! (%u)\n", queue->size);
1340 if (NULL == peer->core_transmit)
1342 dst_id = GNUNET_PEER_resolve2 (peer->id);
1343 peer->core_transmit =
1344 GNUNET_CORE_notify_transmit_ready (core_handle,
1345 GNUNET_NO, get_priority (queue),
1346 GNUNET_TIME_UNIT_FOREVER_REL,
1348 get_core_size (queue->size),
1351 peer->tmt_time = GNUNET_TIME_absolute_get ();
1352 queue->start_waiting = GNUNET_TIME_absolute_get ();
1356 LOG (GNUNET_ERROR_TYPE_DEBUG, "* tmt rdy called somewhere else\n");
1358 // GCC_start_poll (); FIXME needed?
1362 // GCC_stop_poll(); FIXME needed?
1365 LOG (GNUNET_ERROR_TYPE_DEBUG, " return %d\n", total_size);
1366 queue_debug (peer, GNUNET_ERROR_TYPE_DEBUG);
1367 GCC_check_connections ();
1372 /******************************************************************************/
1373 /******************************** API ***********************************/
1374 /******************************************************************************/
1378 * Free a transmission that was already queued with all resources
1379 * associated to the request.
1381 * If connection was marked to be destroyed, and this was the last queued
1382 * message on it, the connection will be free'd as a result.
1384 * @param queue Queue handler to cancel.
1385 * @param clear_cls Is it necessary to free associated cls?
1386 * @param sent Was it really sent? (Could have been canceled)
1387 * @param pid PID, if relevant (was sent and was a payload message).
1389 * @return #GNUNET_YES if connection was destroyed as a result,
1390 * #GNUNET_NO otherwise.
1393 GCP_queue_destroy (struct CadetPeerQueue *queue,
1398 struct CadetPeer *peer;
1399 int connection_destroyed;
1401 GCC_check_connections ();
1403 LOG (GNUNET_ERROR_TYPE_DEBUG, "queue destroy %s\n", GC_m2s (queue->type));
1404 if (GNUNET_YES == clear_cls)
1406 LOG (GNUNET_ERROR_TYPE_DEBUG, " free cls\n");
1407 switch (queue->type)
1409 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY:
1410 LOG (GNUNET_ERROR_TYPE_INFO, "destroying a DESTROY message\n");
1412 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK:
1413 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE:
1414 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN:
1415 case GNUNET_MESSAGE_TYPE_CADET_KX:
1416 case GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED:
1417 case GNUNET_MESSAGE_TYPE_CADET_AX:
1418 case GNUNET_MESSAGE_TYPE_CADET_ACK:
1419 case GNUNET_MESSAGE_TYPE_CADET_POLL:
1420 GNUNET_free_non_null (queue->cls);
1425 LOG (GNUNET_ERROR_TYPE_ERROR, " type %s unknown!\n",
1426 GC_m2s (queue->type));
1429 GNUNET_CONTAINER_DLL_remove (peer->queue_head, peer->queue_tail, queue);
1431 if (!is_connection_management (queue->type))
1436 if (NULL != queue->cont)
1438 struct GNUNET_TIME_Relative wait_time;
1440 wait_time = GNUNET_TIME_absolute_get_duration (queue->start_waiting);
1441 LOG (GNUNET_ERROR_TYPE_DEBUG, " calling callback, time elapsed %s\n",
1442 GNUNET_STRINGS_relative_time_to_string (wait_time, GNUNET_NO));
1443 connection_destroyed = queue->cont (queue->cont_cls,
1444 queue->c, sent, queue->type, pid,
1445 queue->fwd, queue->size, wait_time);
1449 connection_destroyed = GNUNET_NO;
1452 if (NULL == peer_get_first_message (peer) && NULL != peer->core_transmit)
1454 GNUNET_CORE_notify_transmit_ready_cancel (peer->core_transmit);
1455 peer->core_transmit = NULL;
1456 peer->tmt_time.abs_value_us = 0;
1459 GNUNET_free (queue);
1460 GCC_check_connections ();
1461 return connection_destroyed;
1466 * @brief Queue and pass message to core when possible.
1468 * @param peer Peer towards which to queue the message.
1469 * @param cls Closure (@c type dependant). It will be used by queue_send to
1470 * build the message to be sent if not already prebuilt.
1471 * @param type Type of the message.
1472 * @param payload_type Type of the message's payload
1473 * 0 if the message is a retransmission (unknown payload).
1474 * UINT16_MAX if the message does not have payload.
1475 * @param payload_id ID of the payload (MID, ACK #, etc)
1476 * @param size Size of the message.
1477 * @param c Connection this message belongs to (can be NULL).
1478 * @param fwd Is this a message going root->dest? (FWD ACK are NOT FWD!)
1479 * @param cont Continuation to be called once CORE has taken the message.
1480 * @param cont_cls Closure for @c cont.
1482 * @return Handle to cancel the message before it is sent. Once cont is called
1483 * message has been sent and therefore the handle is no longer valid.
1485 struct CadetPeerQueue *
1486 GCP_queue_add (struct CadetPeer *peer,
1489 uint16_t payload_type,
1490 uint32_t payload_id,
1492 struct CadetConnection *c,
1497 struct CadetPeerQueue *q;
1501 GCC_check_connections ();
1502 LOG (GNUNET_ERROR_TYPE_DEBUG,
1503 "que %s (%s %4u) on conn %s (%p) %s towards %s (size %u)\n",
1504 GC_m2s (type), GC_m2s (payload_type), payload_id,
1505 GCC_2s (c), c, GC_f2s (fwd), GCP_2s (peer), size);
1507 if (NULL == peer->connections)
1509 /* We are not connected to this peer, ignore request. */
1510 LOG (GNUNET_ERROR_TYPE_INFO, "%s not a neighbor\n", GCP_2s (peer));
1511 GNUNET_STATISTICS_update (stats, "# messages dropped due to wrong hop", 1,
1517 if (is_connection_management (type))
1521 LOG (GNUNET_ERROR_TYPE_DEBUG, "priority %d\n", priority);
1523 call_core = (NULL == c || GNUNET_MESSAGE_TYPE_CADET_KX == type) ?
1524 GNUNET_YES : GCC_is_sendable (c, fwd);
1525 q = GNUNET_new (struct CadetPeerQueue);
1528 q->payload_type = payload_type;
1529 q->payload_id = payload_id;
1535 q->cont_cls = cont_cls;
1538 GNUNET_CONTAINER_DLL_insert_tail (peer->queue_head, peer->queue_tail, q);
1543 GNUNET_CONTAINER_DLL_insert (peer->queue_head, peer->queue_tail, q);
1544 call_core = GNUNET_YES;
1547 q->start_waiting = GNUNET_TIME_absolute_get ();
1548 if (NULL == peer->core_transmit && GNUNET_YES == call_core)
1550 LOG (GNUNET_ERROR_TYPE_DEBUG,
1551 "calling core tmt rdy towards %s for %u bytes\n",
1552 GCP_2s (peer), size);
1553 peer->core_transmit =
1554 GNUNET_CORE_notify_transmit_ready (core_handle,
1555 GNUNET_NO, get_priority (q),
1556 GNUNET_TIME_UNIT_FOREVER_REL,
1557 GNUNET_PEER_resolve2 (peer->id),
1558 get_core_size (size),
1560 peer->tmt_time = GNUNET_TIME_absolute_get ();
1562 else if (GNUNET_NO == call_core)
1564 LOG (GNUNET_ERROR_TYPE_DEBUG, "core tmt rdy towards %s not needed\n",
1570 struct GNUNET_TIME_Relative elapsed;
1571 elapsed = GNUNET_TIME_absolute_get_duration (peer->tmt_time);
1572 LOG (GNUNET_ERROR_TYPE_DEBUG, "core tmt rdy towards %s already called %s\n",
1574 GNUNET_STRINGS_relative_time_to_string (elapsed, GNUNET_NO));
1577 queue_debug (peer, GNUNET_ERROR_TYPE_DEBUG);
1578 GCC_check_connections ();
1584 * Cancel all queued messages to a peer that belong to a certain connection.
1586 * @param peer Peer towards whom to cancel.
1587 * @param c Connection whose queued messages to cancel. Might be destroyed by
1588 * the sent continuation call.
1591 GCP_queue_cancel (struct CadetPeer *peer,
1592 struct CadetConnection *c)
1594 struct CadetPeerQueue *q;
1595 struct CadetPeerQueue *next;
1596 struct CadetPeerQueue *prev;
1597 int connection_destroyed;
1599 GCC_check_connections ();
1600 connection_destroyed = GNUNET_NO;
1601 for (q = peer->queue_head; NULL != q; q = next)
1606 LOG (GNUNET_ERROR_TYPE_DEBUG,
1607 "GMP queue cancel %s\n",
1609 GNUNET_assert (GNUNET_NO == connection_destroyed);
1610 if (GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY == q->type)
1616 connection_destroyed = GCP_queue_destroy (q, GNUNET_YES, GNUNET_NO, 0);
1619 /* Get next from prev, q->next might be already freed:
1620 * queue destroy -> callback -> GCC_destroy -> cancel_queues -> here
1623 next = peer->queue_head;
1633 if ( (NULL == peer->queue_head) &&
1634 (NULL != peer->core_transmit) )
1636 GNUNET_CORE_notify_transmit_ready_cancel (peer->core_transmit);
1637 peer->core_transmit = NULL;
1638 peer->tmt_time.abs_value_us = 0;
1640 GCC_check_connections ();
1645 * Get the first transmittable message for a connection.
1647 * @param peer Neighboring peer.
1648 * @param c Connection.
1650 * @return First transmittable message.
1652 static struct CadetPeerQueue *
1653 connection_get_first_message (struct CadetPeer *peer, struct CadetConnection *c)
1655 struct CadetPeerQueue *q;
1657 for (q = peer->queue_head; NULL != q; q = q->next)
1661 if (queue_is_sendable (q))
1663 LOG (GNUNET_ERROR_TYPE_DEBUG, " sendable!!\n");
1666 LOG (GNUNET_ERROR_TYPE_DEBUG, " not sendable\n");
1674 * Get the first message for a connection and unqueue it.
1676 * Only tunnel (or higher) level messages are unqueued. Connection specific
1677 * messages are silently destroyed upon encounter.
1679 * @param peer Neighboring peer.
1680 * @param c Connection.
1681 * @param destroyed[in/out] Was the connection destroyed (prev/as a result)?.
1684 * @return First message for this connection.
1686 struct GNUNET_MessageHeader *
1687 GCP_connection_pop (struct CadetPeer *peer,
1688 struct CadetConnection *c,
1691 struct CadetPeerQueue *q;
1692 struct CadetPeerQueue *next;
1693 struct GNUNET_MessageHeader *msg;
1696 GCC_check_connections ();
1697 GNUNET_assert (NULL != destroyed);
1698 LOG (GNUNET_ERROR_TYPE_DEBUG, "connection_pop on conn %p\n", c);
1699 for (q = peer->queue_head; NULL != q; q = next)
1704 LOG (GNUNET_ERROR_TYPE_DEBUG, " - queued: %s (%s %u), cont: %p\n",
1705 GC_m2s (q->type), GC_m2s (q->payload_type), q->payload_id,
1709 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE:
1710 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK:
1711 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY:
1712 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN:
1713 case GNUNET_MESSAGE_TYPE_CADET_ACK:
1714 case GNUNET_MESSAGE_TYPE_CADET_POLL:
1715 dest = GCP_queue_destroy (q, GNUNET_YES, GNUNET_NO, 0);
1716 if (GNUNET_YES == dest)
1718 GNUNET_break (GNUNET_NO == *destroyed);
1719 *destroyed = GNUNET_YES;
1723 case GNUNET_MESSAGE_TYPE_CADET_KX:
1724 case GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED:
1725 case GNUNET_MESSAGE_TYPE_CADET_AX:
1726 case GNUNET_MESSAGE_TYPE_CADET_AX_KX:
1727 msg = (struct GNUNET_MessageHeader *) q->cls;
1728 dest = GCP_queue_destroy (q, GNUNET_NO, GNUNET_NO, 0);
1729 if (GNUNET_YES == dest)
1731 GNUNET_break (GNUNET_NO == *destroyed);
1732 *destroyed = GNUNET_YES;
1738 LOG (GNUNET_ERROR_TYPE_DEBUG, "Unknown message %s\n", GC_m2s (q->type));
1741 GCC_check_connections ();
1747 * Unlock a possibly locked queue for a connection.
1749 * If there is a message that can be sent on this connection, call core for it.
1750 * Otherwise (if core transmit is already called or there is no sendable
1751 * message) do nothing.
1753 * @param peer Peer who keeps the queue.
1754 * @param c Connection whose messages to unlock.
1757 GCP_queue_unlock (struct CadetPeer *peer, struct CadetConnection *c)
1759 struct CadetPeerQueue *q;
1762 GCC_check_connections ();
1763 if (NULL != peer->core_transmit)
1765 LOG (GNUNET_ERROR_TYPE_DEBUG, " already unlocked!\n");
1766 return; /* Already unlocked */
1769 q = connection_get_first_message (peer, c);
1772 LOG (GNUNET_ERROR_TYPE_DEBUG, " queue empty!\n");
1773 return; /* Nothing to transmit */
1777 peer->core_transmit =
1778 GNUNET_CORE_notify_transmit_ready (core_handle,
1779 GNUNET_NO, get_priority (q),
1780 GNUNET_TIME_UNIT_FOREVER_REL,
1781 GNUNET_PEER_resolve2 (peer->id),
1782 get_core_size (size),
1785 peer->tmt_time = GNUNET_TIME_absolute_get ();
1786 GCC_check_connections ();
1791 * Initialize the peer subsystem.
1793 * @param c Configuration.
1796 GCP_init (const struct GNUNET_CONFIGURATION_Handle *c)
1798 LOG (GNUNET_ERROR_TYPE_DEBUG,
1800 in_shutdown = GNUNET_NO;
1801 peers = GNUNET_CONTAINER_multipeermap_create (128, GNUNET_NO);
1803 GNUNET_CONFIGURATION_get_value_number (c, "CADET", "MAX_PEERS",
1806 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_WARNING,
1807 "CADET", "MAX_PEERS", "USING DEFAULT");
1812 GNUNET_CONFIGURATION_get_value_number (c, "CADET", "DROP_PERCENT",
1819 LOG (GNUNET_ERROR_TYPE_WARNING, "**************************************\n");
1820 LOG (GNUNET_ERROR_TYPE_WARNING, "Cadet is running with DROP enabled.\n");
1821 LOG (GNUNET_ERROR_TYPE_WARNING, "This is NOT a good idea!\n");
1822 LOG (GNUNET_ERROR_TYPE_WARNING, "Remove DROP_PERCENT from config file.\n");
1823 LOG (GNUNET_ERROR_TYPE_WARNING, "**************************************\n");
1825 ats_ch = GNUNET_ATS_connectivity_init (c);
1826 core_handle = GNUNET_CORE_connect (c, /* Main configuration */
1827 NULL, /* Closure passed to CADET functions */
1828 &core_init, /* Call core_init once connected */
1829 &core_connect, /* Handle connects */
1830 &core_disconnect, /* remove peers on disconnects */
1831 NULL, /* Don't notify about all incoming messages */
1832 GNUNET_NO, /* For header only in notification */
1833 NULL, /* Don't notify about all outbound messages */
1834 GNUNET_NO, /* For header-only out notification */
1835 core_handlers); /* Register these handlers */
1837 GNUNET_CONFIGURATION_get_value_yesno (c, "CADET", "DISABLE_TRY_CONNECT"))
1839 transport_handle = GNUNET_TRANSPORT_connect (c, &my_full_id, NULL, /* cls */
1840 /* Notify callbacks */
1845 LOG (GNUNET_ERROR_TYPE_WARNING, "**************************************\n");
1846 LOG (GNUNET_ERROR_TYPE_WARNING, "* DISABLE TRYING CONNECT in config *\n");
1847 LOG (GNUNET_ERROR_TYPE_WARNING, "* Use this only for test purposes. *\n");
1848 LOG (GNUNET_ERROR_TYPE_WARNING, "**************************************\n");
1849 transport_handle = NULL;
1854 if (NULL == core_handle)
1857 GNUNET_SCHEDULER_shutdown ();
1865 * Shut down the peer subsystem.
1870 LOG (GNUNET_ERROR_TYPE_DEBUG,
1871 "Shutting down peer subsystem\n");
1872 in_shutdown = GNUNET_YES;
1873 GNUNET_CONTAINER_multipeermap_iterate (peers,
1876 if (NULL != core_handle)
1878 GNUNET_CORE_disconnect (core_handle);
1881 if (NULL != transport_handle)
1883 GNUNET_TRANSPORT_disconnect (transport_handle);
1884 transport_handle = NULL;
1888 GNUNET_ATS_connectivity_done (ats_ch);
1891 GNUNET_PEER_change_rc (myid, -1);
1892 GNUNET_CONTAINER_multipeermap_destroy (peers);
1898 * Retrieve the CadetPeer stucture associated with the peer. Optionally create
1899 * one and insert it in the appropriate structures if the peer is not known yet.
1901 * @param peer_id Full identity of the peer.
1902 * @param create #GNUNET_YES if a new peer should be created if unknown.
1903 * #GNUNET_NO otherwise.
1905 * @return Existing or newly created peer structure.
1906 * NULL if unknown and not requested @a create
1909 GCP_get (const struct GNUNET_PeerIdentity *peer_id, int create)
1911 struct CadetPeer *peer;
1913 peer = GNUNET_CONTAINER_multipeermap_get (peers, peer_id);
1916 peer = GNUNET_new (struct CadetPeer);
1917 if (GNUNET_CONTAINER_multipeermap_size (peers) > max_peers)
1919 peer_delete_oldest ();
1921 GNUNET_assert (GNUNET_OK ==
1922 GNUNET_CONTAINER_multipeermap_put (peers,
1925 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
1926 peer->id = GNUNET_PEER_intern (peer_id);
1928 peer->last_contact = GNUNET_TIME_absolute_get ();
1935 * Retrieve the CadetPeer stucture associated with the
1936 * peer. Optionally create one and insert it in the appropriate
1937 * structures if the peer is not known yet.
1939 * @param peer Short identity of the peer.
1940 * @param create #GNUNET_YES if a new peer should be created if unknown.
1941 * #GNUNET_NO otherwise.
1943 * @return Existing or newly created peer structure.
1944 * NULL if unknown and not requested @a create
1947 GCP_get_short (const GNUNET_PEER_Id peer, int create)
1949 return GCP_get (GNUNET_PEER_resolve2 (peer), create);
1954 * Function called once #GNUNET_TRANSPORT_offer_hello() is done.
1955 * Marks the operation as finished.
1957 * @param cls Closure (our `struct CadetPeer`).
1960 hello_offer_done (void *cls)
1962 struct CadetPeer *peer = cls;
1964 peer->hello_offer = NULL;
1969 * Try to establish a new connection to this peer (in its tunnel).
1970 * If the peer doesn't have any path to it yet, try to get one.
1971 * If the peer already has some path, send a CREATE CONNECTION towards it.
1973 * @param peer Peer to connect to.
1976 GCP_connect (struct CadetPeer *peer)
1978 struct CadetTunnel *t;
1979 struct CadetPeerPath *path;
1980 struct CadetConnection *c;
1983 GCC_check_connections ();
1984 LOG (GNUNET_ERROR_TYPE_DEBUG,
1985 "peer_connect towards %s\n",
1987 /* If we have a current hello, try to connect using it. */
1988 GCP_try_connect (peer);
1992 rerun_search = GNUNET_NO;
1994 if (NULL != peer->path_head)
1996 LOG (GNUNET_ERROR_TYPE_DEBUG, " some path exists\n");
1997 path = peer_get_best_path (peer);
2003 LOG (GNUNET_ERROR_TYPE_DEBUG, " path to use: %s\n", s);
2006 c = GCT_use_path (t, path);
2009 /* This case can happen when the path includes a first hop that is
2010 * not yet known to be connected.
2012 * This happens quite often during testing when running cadet
2013 * under valgrind: core connect notifications come very late
2014 * and the DHT result has already come and created a valid
2015 * path. In this case, the peer->connections
2016 * hashmaps will be NULL and tunnel_use_path will not be able
2017 * to create a connection from that path.
2019 * Re-running the DHT GET should give core time to callback.
2021 * GCT_use_path -> GCC_new -> register_neighbors takes care of
2022 * updating statistics about this issue.
2024 rerun_search = GNUNET_YES;
2028 GCC_send_create (c);
2034 LOG (GNUNET_ERROR_TYPE_DEBUG, " but is NULL, all paths are in use\n");
2038 if (GNUNET_YES == rerun_search)
2040 struct GNUNET_TIME_Relative delay;
2042 GCP_stop_search (peer);
2043 delay = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS, 100);
2044 peer->search_delayed = GNUNET_SCHEDULER_add_delayed (delay,
2047 GCC_check_connections ();
2051 if (GNUNET_NO == is_searching (peer))
2052 GCP_start_search (peer);
2053 GCC_check_connections ();
2058 * Chech whether there is a direct (core level) connection to peer.
2060 * @param peer Peer to check.
2062 * @return #GNUNET_YES if there is a direct connection.
2065 GCP_is_neighbor (const struct CadetPeer *peer)
2067 struct CadetPeerPath *path;
2069 if (NULL == peer->connections)
2072 for (path = peer->path_head; NULL != path; path = path->next)
2074 if (3 > path->length)
2078 /* Is not a neighbor but connections is not NULL, probably disconnecting */
2085 * Create and initialize a new tunnel towards a peer, in case it has none.
2086 * In case the peer already has a tunnel, nothing is done.
2088 * Does not generate any traffic, just creates the local data structures.
2090 * @param peer Peer towards which to create the tunnel.
2093 GCP_add_tunnel (struct CadetPeer *peer)
2095 GCC_check_connections ();
2096 if (NULL != peer->tunnel)
2098 peer->tunnel = GCT_new (peer);
2099 GCC_check_connections ();
2104 * Add a connection to a neighboring peer.
2106 * Store that the peer is the first hop of the connection in one
2107 * direction and that on peer disconnect the connection must be
2108 * notified and destroyed, for it will no longer be valid.
2110 * @param peer Peer to add connection to.
2111 * @param c Connection to add.
2112 * @param pred #GNUNET_YES if we are predecessor, #GNUNET_NO if we are successor
2115 GCP_add_connection (struct CadetPeer *peer,
2116 struct CadetConnection *c,
2119 LOG (GNUNET_ERROR_TYPE_DEBUG,
2120 "adding connection %s\n",
2122 LOG (GNUNET_ERROR_TYPE_DEBUG,
2125 GNUNET_assert (NULL != peer->connections);
2126 GNUNET_assert (GNUNET_OK ==
2127 GNUNET_CONTAINER_multihashmap_put (peer->connections,
2130 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
2131 LOG (GNUNET_ERROR_TYPE_DEBUG,
2132 "Peer %s has now %u connections.\n",
2134 GNUNET_CONTAINER_multihashmap_size (peer->connections));
2139 * Add the path to the peer and update the path used to reach it in case this
2142 * @param peer Destination peer to add the path to.
2143 * @param path New path to add. Last peer must be @c peer.
2144 * Path will be either used of freed if already known.
2145 * @param trusted Do we trust that this path is real?
2147 * @return path if path was taken, pointer to existing duplicate if exists
2150 struct CadetPeerPath *
2151 GCP_add_path (struct CadetPeer *peer,
2152 struct CadetPeerPath *path,
2155 struct CadetPeerPath *aux;
2159 GCC_check_connections ();
2160 LOG (GNUNET_ERROR_TYPE_DEBUG,
2161 "adding path [%u] to peer %s\n",
2162 path->length, GCP_2s (peer));
2164 if (NULL == peer || NULL == path
2165 || path->peers[path->length - 1] != peer->id)
2168 path_destroy (path);
2172 for (l = 1; l < path->length; l++)
2174 if (path->peers[l] == myid)
2176 LOG (GNUNET_ERROR_TYPE_DEBUG, " shortening path by %u\n", l);
2177 for (l2 = 0; l2 < path->length - l; l2++)
2179 path->peers[l2] = path->peers[l + l2];
2183 path->peers = GNUNET_realloc (path->peers,
2184 path->length * sizeof (GNUNET_PEER_Id));
2188 LOG (GNUNET_ERROR_TYPE_DEBUG, " final length: %u\n", path->length);
2190 if (2 >= path->length && GNUNET_NO == trusted)
2192 /* Only allow CORE to tell us about direct paths */
2193 path_destroy (path);
2197 l = path_get_length (path);
2200 path_destroy (path);
2204 GNUNET_assert (peer->id == path->peers[path->length - 1]);
2205 for (aux = peer->path_head; aux != NULL; aux = aux->next)
2207 l2 = path_get_length (aux);
2210 LOG (GNUNET_ERROR_TYPE_DEBUG, " added\n");
2211 GNUNET_CONTAINER_DLL_insert_before (peer->path_head,
2212 peer->path_tail, aux, path);
2217 if (l2 == l && memcmp (path->peers, aux->peers, l) == 0)
2219 LOG (GNUNET_ERROR_TYPE_DEBUG, " already known\n");
2220 path_destroy (path);
2225 GNUNET_CONTAINER_DLL_insert_tail (peer->path_head,
2228 LOG (GNUNET_ERROR_TYPE_DEBUG, " added last\n");
2231 if (NULL != peer->tunnel
2232 && CONNECTIONS_PER_TUNNEL > GCT_count_connections (peer->tunnel)
2233 && 2 < path->length) /* Direct paths are handled by core_connect */
2237 GCC_check_connections ();
2243 * Add the path to the origin peer and update the path used to reach it in case
2244 * this is the shortest.
2245 * The path is given in peer_info -> destination, therefore we turn the path
2246 * upside down first.
2248 * @param peer Peer to add the path to, being the origin of the path.
2249 * @param path New path to add after being inversed.
2250 * Path will be either used or freed.
2251 * @param trusted Do we trust that this path is real?
2253 * @return path if path was taken, pointer to existing duplicate if exists
2256 struct CadetPeerPath *
2257 GCP_add_path_to_origin (struct CadetPeer *peer,
2258 struct CadetPeerPath *path,
2264 return GCP_add_path (peer, path, trusted);
2269 * Adds a path to the info of all the peers in the path
2271 * @param p Path to process.
2272 * @param confirmed Whether we know if the path works or not.
2275 GCP_add_path_to_all (const struct CadetPeerPath *p, int confirmed)
2279 /* TODO: invert and add */
2280 GCC_check_connections ();
2281 for (i = 0; i < p->length && p->peers[i] != myid; i++) /* skip'em */ ;
2282 for (i++; i < p->length; i++)
2284 struct CadetPeer *peer;
2285 struct CadetPeerPath *copy;
2287 peer = GCP_get_short (p->peers[i], GNUNET_YES);
2288 copy = path_duplicate (p);
2289 copy->length = i + 1;
2290 GCP_add_path (peer, copy, 3 > p->length ? GNUNET_NO : confirmed);
2292 GCC_check_connections ();
2297 * Remove any path to the peer that has the exact same peers as the one given.
2299 * @param peer Peer to remove the path from.
2300 * @param path Path to remove. Is always destroyed .
2303 GCP_remove_path (struct CadetPeer *peer,
2304 struct CadetPeerPath *path)
2306 struct CadetPeerPath *iter;
2307 struct CadetPeerPath *next;
2309 GCC_check_connections ();
2310 GNUNET_assert (myid == path->peers[0]);
2311 GNUNET_assert (peer->id == path->peers[path->length - 1]);
2313 LOG (GNUNET_ERROR_TYPE_INFO,
2314 "Removing path %p (%u) from %s\n",
2315 path, path->length, GCP_2s (peer));
2317 for (iter = peer->path_head; NULL != iter; iter = next)
2320 if (0 == path_cmp (path, iter))
2322 GNUNET_CONTAINER_DLL_remove (peer->path_head,
2326 path_destroy (iter);
2329 path_destroy (path);
2330 GCC_check_connections ();
2335 * Check that we are aware of a connection from a neighboring peer.
2337 * @param peer Peer to the connection is with
2338 * @param c Connection that should be in the map with this peer.
2341 GCP_check_connection (const struct CadetPeer *peer,
2342 const struct CadetConnection *c)
2344 GNUNET_assert (NULL != peer);
2345 GNUNET_assert (NULL != peer->connections);
2347 GNUNET_assert (GNUNET_YES ==
2348 GNUNET_CONTAINER_multihashmap_contains_value (peer->connections,
2355 * Remove a connection from a neighboring peer.
2357 * @param peer Peer to remove connection from.
2358 * @param c Connection to remove.
2361 GCP_remove_connection (struct CadetPeer *peer,
2362 const struct CadetConnection *c)
2364 LOG (GNUNET_ERROR_TYPE_DEBUG,
2365 "Removing connection %s\n",
2367 LOG (GNUNET_ERROR_TYPE_DEBUG,
2370 if ( (NULL == peer) ||
2371 (NULL == peer->connections) )
2373 GNUNET_assert (GNUNET_YES ==
2374 GNUNET_CONTAINER_multihashmap_remove (peer->connections,
2377 LOG (GNUNET_ERROR_TYPE_DEBUG,
2378 "Peer %s remains with %u connections.\n",
2380 GNUNET_CONTAINER_multihashmap_size (peer->connections));
2385 * Start the DHT search for new paths towards the peer: we don't have
2386 * enough good connections.
2388 * @param peer Destination peer.
2391 GCP_start_search (struct CadetPeer *peer)
2393 const struct GNUNET_PeerIdentity *id;
2394 struct CadetTunnel *t = peer->tunnel;
2396 GCC_check_connections ();
2397 if (NULL != peer->search_h)
2403 if (NULL != peer->search_delayed)
2404 GCP_stop_search (peer);
2406 id = GNUNET_PEER_resolve2 (peer->id);
2407 peer->search_h = GCD_search (id, &search_handler, peer);
2411 /* Why would we search for a peer with no tunnel towards it? */
2416 if (CADET_TUNNEL_NEW == GCT_get_cstate (t)
2417 || 0 == GCT_count_any_connections (t))
2419 GCT_change_cstate (t, CADET_TUNNEL_SEARCHING);
2421 GCC_check_connections ();
2426 * Stop the DHT search for new paths towards the peer: we already have
2427 * enough good connections.
2429 * @param peer Destination peer.
2432 GCP_stop_search (struct CadetPeer *peer)
2434 GCC_check_connections ();
2435 if (NULL != peer->search_h)
2437 GCD_search_stop (peer->search_h);
2438 peer->search_h = NULL;
2440 if (NULL != peer->search_delayed)
2442 GNUNET_SCHEDULER_cancel (peer->search_delayed);
2443 peer->search_delayed = NULL;
2445 GCC_check_connections ();
2450 * Get the Full ID of a peer.
2452 * @param peer Peer to get from.
2454 * @return Full ID of peer.
2456 const struct GNUNET_PeerIdentity *
2457 GCP_get_id (const struct CadetPeer *peer)
2459 return GNUNET_PEER_resolve2 (peer->id);
2464 * Get the Short ID of a peer.
2466 * @param peer Peer to get from.
2468 * @return Short ID of peer.
2471 GCP_get_short_id (const struct CadetPeer *peer)
2480 * If tunnel is NULL and there was a search active, stop it, as it's useless.
2486 GCP_set_tunnel (struct CadetPeer *peer, struct CadetTunnel *t)
2489 if (NULL == t && GNUNET_YES == is_searching (peer))
2491 GCP_stop_search (peer);
2497 * Get the tunnel towards a peer.
2499 * @param peer Peer to get from.
2501 * @return Tunnel towards peer.
2503 struct CadetTunnel *
2504 GCP_get_tunnel (const struct CadetPeer *peer)
2508 return peer->tunnel;
2513 * Set the hello message.
2515 * @param peer Peer whose message to set.
2516 * @param hello Hello message.
2519 GCP_set_hello (struct CadetPeer *peer,
2520 const struct GNUNET_HELLO_Message *hello)
2522 struct GNUNET_HELLO_Message *old;
2525 GCC_check_connections ();
2526 LOG (GNUNET_ERROR_TYPE_DEBUG, "set hello for %s\n", GCP_2s (peer));
2530 old = GCP_get_hello (peer);
2533 size = GNUNET_HELLO_size (hello);
2534 peer->hello = GNUNET_malloc (size);
2535 memcpy (peer->hello, hello, size);
2539 peer->hello = GNUNET_HELLO_merge (old, hello);
2542 GCC_check_connections ();
2547 * Get the hello message.
2549 * @param peer Peer whose message to get.
2551 * @return Hello message.
2553 struct GNUNET_HELLO_Message *
2554 GCP_get_hello (struct CadetPeer *peer)
2556 struct GNUNET_TIME_Absolute expiration;
2557 struct GNUNET_TIME_Relative remaining;
2559 if (NULL == peer->hello)
2562 expiration = GNUNET_HELLO_get_last_expiration (peer->hello);
2563 remaining = GNUNET_TIME_absolute_get_remaining (expiration);
2564 if (0 == remaining.rel_value_us)
2566 LOG (GNUNET_ERROR_TYPE_DEBUG, " get - hello expired on %s\n",
2567 GNUNET_STRINGS_absolute_time_to_string (expiration));
2568 GNUNET_free (peer->hello);
2576 * Try to connect to a peer on TRANSPORT level.
2578 * @param peer Peer to whom to connect.
2581 GCP_try_connect (struct CadetPeer *peer)
2583 struct GNUNET_HELLO_Message *hello;
2584 struct GNUNET_MessageHeader *mh;
2586 if (NULL == transport_handle)
2588 GCC_check_connections ();
2589 if (GNUNET_YES == GCP_is_neighbor (peer))
2591 hello = GCP_get_hello (peer);
2595 mh = GNUNET_HELLO_get_header (hello);
2596 if (NULL != peer->hello_offer)
2598 GNUNET_TRANSPORT_offer_hello_cancel (peer->hello_offer);
2599 peer->hello_offer = NULL;
2601 peer->hello_offer = GNUNET_TRANSPORT_offer_hello (transport_handle,
2605 if (NULL == peer->connectivity_suggestion)
2606 peer->connectivity_suggestion
2607 = GNUNET_ATS_connectivity_suggest (ats_ch,
2608 GNUNET_PEER_resolve2 (peer->id),
2610 GCC_check_connections ();
2615 * Notify a peer that a link between two other peers is broken. If any path
2616 * used that link, eliminate it.
2618 * @param peer Peer affected by the change.
2619 * @param peer1 Peer whose link is broken.
2620 * @param peer2 Peer whose link is broken.
2623 GCP_notify_broken_link (struct CadetPeer *peer,
2624 const struct GNUNET_PeerIdentity *peer1,
2625 const struct GNUNET_PeerIdentity *peer2)
2627 struct CadetPeerPath *iter;
2628 struct CadetPeerPath *next;
2633 GCC_check_connections ();
2634 p1 = GNUNET_PEER_search (peer1);
2635 p2 = GNUNET_PEER_search (peer2);
2637 LOG (GNUNET_ERROR_TYPE_DEBUG, "Link %u-%u broken\n", p1, p2);
2638 if (0 == p1 || 0 == p2)
2640 /* We don't even know them */
2644 for (iter = peer->path_head; NULL != iter; iter = next)
2647 for (i = 0; i < iter->length - 1; i++)
2649 if ((iter->peers[i] == p1 && iter->peers[i + 1] == p2)
2650 || (iter->peers[i] == p2 && iter->peers[i + 1] == p1))
2655 LOG (GNUNET_ERROR_TYPE_DEBUG, " - invalidating %s\n", s);
2658 path_invalidate (iter);
2662 GCC_check_connections ();
2667 * Count the number of known paths toward the peer.
2669 * @param peer Peer to get path info.
2671 * @return Number of known paths.
2674 GCP_count_paths (const struct CadetPeer *peer)
2676 struct CadetPeerPath *iter;
2679 for (iter = peer->path_head, i = 0; NULL != iter; iter = iter->next)
2687 * Iterate over the paths to a peer.
2689 * @param peer Peer to get path info.
2690 * @param callback Function to call for every path.
2691 * @param cls Closure for @a callback.
2693 * @return Number of iterated paths.
2696 GCP_iterate_paths (struct CadetPeer *peer,
2697 GCP_path_iterator callback,
2700 struct CadetPeerPath *iter;
2703 for (iter = peer->path_head, i = 0; NULL != iter; iter = iter->next)
2706 if (GNUNET_YES != callback (cls, peer, iter))
2715 * Iterate all known peers.
2717 * @param iter Iterator.
2718 * @param cls Closure for @c iter.
2721 GCP_iterate_all (GNUNET_CONTAINER_PeerMapIterator iter,
2724 GCC_check_connections ();
2725 GNUNET_CONTAINER_multipeermap_iterate (peers,
2728 GCC_check_connections ();
2733 * Get the static string for a peer ID.
2737 * @return Static string for it's ID.
2740 GCP_2s (const struct CadetPeer *peer)
2744 return GNUNET_i2s (GNUNET_PEER_resolve2 (peer->id));
2748 /* end of gnunet-service-cadet_peer.c */