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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;
250 static const struct GNUNET_CONFIGURATION_Handle *cfg;
253 * Handle to communicate with ATS.
255 static struct GNUNET_ATS_ConnectivityHandle *ats_ch;
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_STATISTICS_update (stats,
463 if ( (NULL != GCP_get_tunnel (neighbor)) &&
464 (0 > GNUNET_CRYPTO_cmp_peer_identity (&my_full_id, peer)) )
465 GCP_connect (neighbor);
466 GCC_check_connections ();
471 * Method called whenever a peer disconnects.
474 * @param peer peer identity this notification is about
477 core_disconnect (void *cls,
478 const struct GNUNET_PeerIdentity *peer)
481 struct CadetPeerPath *direct_path;
484 GCC_check_connections ();
485 strncpy (own_id, GNUNET_i2s (&my_full_id), 16);
487 p = GNUNET_CONTAINER_multipeermap_get (peers, peer);
490 GNUNET_break (GNUNET_YES == in_shutdown);
494 LOG (GNUNET_ERROR_TYPE_INFO,
495 "DISCONNECTED %s (self)\n",
498 LOG (GNUNET_ERROR_TYPE_INFO,
499 "DISCONNECTED %s <= %s\n",
500 own_id, GNUNET_i2s (peer));
501 direct_path = pop_direct_path (p);
502 if (NULL != p->connections)
504 GNUNET_CONTAINER_multihashmap_iterate (p->connections,
507 GNUNET_CONTAINER_multihashmap_destroy (p->connections);
508 p->connections = NULL;
510 if (NULL != p->core_transmit)
512 GNUNET_CORE_notify_transmit_ready_cancel (p->core_transmit);
513 p->core_transmit = NULL;
514 p->tmt_time.abs_value_us = 0;
516 GNUNET_STATISTICS_update (stats,
520 path_destroy (direct_path);
521 GCC_check_connections ();
526 * Functions to handle messages from core
528 static struct GNUNET_CORE_MessageHandler core_handlers[] = {
529 {&GCC_handle_create, GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE, 0},
530 {&GCC_handle_confirm, GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK,
531 sizeof (struct GNUNET_CADET_ConnectionACK)},
532 {&GCC_handle_broken, GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN,
533 sizeof (struct GNUNET_CADET_ConnectionBroken)},
534 {&GCC_handle_destroy, GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY,
535 sizeof (struct GNUNET_CADET_ConnectionDestroy)},
536 {&GCC_handle_ack, GNUNET_MESSAGE_TYPE_CADET_ACK,
537 sizeof (struct GNUNET_CADET_ACK)},
538 {&GCC_handle_poll, GNUNET_MESSAGE_TYPE_CADET_POLL,
539 sizeof (struct GNUNET_CADET_Poll)},
540 {&GCC_handle_kx, GNUNET_MESSAGE_TYPE_CADET_KX, 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 GNUNET_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_AX == q->type)
733 * Destroy the peer_info and free any allocated resources linked to it
735 * @param peer The peer_info to destroy.
736 * @return #GNUNET_OK on success
739 peer_destroy (struct CadetPeer *peer)
741 struct GNUNET_PeerIdentity id;
742 struct CadetPeerPath *p;
743 struct CadetPeerPath *nextp;
745 GNUNET_PEER_resolve (peer->id, &id);
746 GNUNET_PEER_change_rc (peer->id, -1);
748 LOG (GNUNET_ERROR_TYPE_INFO,
749 "destroying peer %s\n",
753 GNUNET_CONTAINER_multipeermap_remove (peers, &id, peer))
756 LOG (GNUNET_ERROR_TYPE_WARNING, " peer not in peermap!!\n");
758 GCP_stop_search (peer);
763 GNUNET_CONTAINER_DLL_remove (peer->path_head,
769 if (NULL != peer->tunnel)
770 GCT_destroy_empty (peer->tunnel);
771 if (NULL != peer->connections)
773 GNUNET_assert (0 == GNUNET_CONTAINER_multihashmap_size (peer->connections));
774 GNUNET_CONTAINER_multihashmap_destroy (peer->connections);
775 peer->connections = NULL;
777 if (NULL != peer->hello_offer)
779 GNUNET_TRANSPORT_offer_hello_cancel (peer->hello_offer);
780 peer->hello_offer = NULL;
782 if (NULL != peer->connectivity_suggestion)
784 GNUNET_ATS_connectivity_suggest_cancel (peer->connectivity_suggestion);
785 peer->connectivity_suggestion = NULL;
787 while (NULL != peer->queue_head)
789 /* This function destroys the current peer->queue_head but
790 * replaces it with the next in the queue, so it is correct
793 GCP_queue_destroy (peer->queue_head, GNUNET_YES, GNUNET_NO, 0);
795 if (NULL != peer->core_transmit)
797 GNUNET_break (0); /* GCP_queue_destroy should've cancelled it! */
798 GNUNET_CORE_notify_transmit_ready_cancel (peer->core_transmit);
799 peer->core_transmit = NULL;
802 GNUNET_free_non_null (peer->hello);
809 * Iterator over peer hash map entries to destroy the peer during in_shutdown.
812 * @param key current key code
813 * @param value value in the hash map
814 * @return #GNUNET_YES if we should continue to iterate,
818 shutdown_peer (void *cls,
819 const struct GNUNET_PeerIdentity *key,
822 struct CadetPeer *p = value;
823 struct CadetTunnel *t = p->tunnel;
825 LOG (GNUNET_ERROR_TYPE_DEBUG, " shutting down %s\n", GCP_2s (p));
836 * Check if peer is searching for a path (either active or delayed search).
838 * @param peer Peer to check
839 * @return #GNUNET_YES if there is a search active.
840 * #GNUNET_NO otherwise.
843 is_searching (const struct CadetPeer *peer)
845 return ( (NULL == peer->search_h) &&
846 (NULL == peer->search_delayed) ) ?
847 GNUNET_NO : GNUNET_YES;
852 * @brief Start a search for a peer.
854 * @param cls Closure (Peer to search for).
857 delayed_search (void *cls)
859 struct CadetPeer *peer = cls;
861 peer->search_delayed = NULL;
862 GCC_check_connections ();
863 GCP_start_search (peer);
864 GCC_check_connections ();
869 * Returns if peer is used (has a tunnel or is neighbor).
871 * @param peer Peer to check.
872 * @return #GNUNET_YES if peer is in use.
875 peer_is_used (struct CadetPeer *peer)
877 struct CadetPeerPath *p;
879 if (NULL != peer->tunnel)
882 for (p = peer->path_head; NULL != p; p = p->next)
892 * Iterator over all the peers to get the oldest timestamp.
894 * @param cls Closure (unsued).
895 * @param key ID of the peer.
896 * @param value Peer_Info of the peer.
899 peer_get_oldest (void *cls,
900 const struct GNUNET_PeerIdentity *key,
903 struct CadetPeer *p = value;
904 struct GNUNET_TIME_Absolute *abs = cls;
906 /* Don't count active peers */
907 if (GNUNET_YES == peer_is_used (p))
910 if (abs->abs_value_us < p->last_contact.abs_value_us)
911 abs->abs_value_us = p->last_contact.abs_value_us;
918 * Iterator over all the peers to remove the oldest entry.
920 * @param cls Closure (unsued).
921 * @param key ID of the peer.
922 * @param value Peer_Info of the peer.
925 peer_timeout (void *cls,
926 const struct GNUNET_PeerIdentity *key,
929 struct CadetPeer *p = value;
930 struct GNUNET_TIME_Absolute *abs = cls;
932 LOG (GNUNET_ERROR_TYPE_WARNING,
933 "peer %s timeout\n", GNUNET_i2s (key));
935 if (p->last_contact.abs_value_us == abs->abs_value_us &&
936 GNUNET_NO == peer_is_used (p))
946 * Delete oldest unused peer.
949 peer_delete_oldest (void)
951 struct GNUNET_TIME_Absolute abs;
953 abs = GNUNET_TIME_UNIT_FOREVER_ABS;
955 GNUNET_CONTAINER_multipeermap_iterate (peers,
958 GNUNET_CONTAINER_multipeermap_iterate (peers,
965 * Choose the best (yet unused) path towards a peer,
966 * considering the tunnel properties.
968 * @param peer The destination peer.
969 * @return Best current known path towards the peer, if any.
971 static struct CadetPeerPath *
972 peer_get_best_path (const struct CadetPeer *peer)
974 struct CadetPeerPath *best_p;
975 struct CadetPeerPath *p;
976 unsigned int best_cost;
979 best_cost = UINT_MAX;
981 for (p = peer->path_head; NULL != p; p = p->next)
983 if (GNUNET_NO == path_is_valid (p))
984 continue; /* Don't use invalid paths. */
985 if (GNUNET_YES == GCT_is_path_used (peer->tunnel, p))
986 continue; /* If path is already in use, skip it. */
988 if ((cost = GCT_get_path_cost (peer->tunnel, p)) < best_cost)
999 * Is this queue element sendable?
1001 * - All management traffic is always sendable.
1002 * - For payload traffic, check the connection flow control.
1004 * @param q Queue element to inspect.
1005 * @return #GNUNET_YES if it is sendable, #GNUNET_NO otherwise.
1008 queue_is_sendable (struct CadetPeerQueue *q)
1010 /* Is PID-independent? */
1013 case GNUNET_MESSAGE_TYPE_CADET_ACK:
1014 case GNUNET_MESSAGE_TYPE_CADET_POLL:
1015 case GNUNET_MESSAGE_TYPE_CADET_KX:
1016 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE:
1017 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK:
1018 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY:
1019 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN:
1022 case GNUNET_MESSAGE_TYPE_CADET_AX:
1029 return GCC_is_sendable (q->c, q->fwd);
1034 * Get first sendable message.
1036 * @param peer The destination peer.
1038 * @return First transmittable message, if any. Otherwise, NULL.
1040 static struct CadetPeerQueue *
1041 peer_get_first_message (const struct CadetPeer *peer)
1043 struct CadetPeerQueue *q;
1045 for (q = peer->queue_head; NULL != q; q = q->next)
1047 LOG (GNUNET_ERROR_TYPE_DEBUG, "Checking q:%p on c:%s\n", q, GCC_2s (q->c));
1048 if (queue_is_sendable (q))
1057 * Function to process paths received for a new peer addition. The recorded
1058 * paths form the initial tunnel, which can be optimized later.
1059 * Called on each result obtained for the DHT search.
1061 * @param cls Closure (peer towards a path has been found).
1062 * @param path Path created from the DHT query. Will be freed afterwards.
1065 search_handler (void *cls, const struct CadetPeerPath *path)
1067 struct CadetPeer *peer = cls;
1068 unsigned int connection_count;
1070 GCC_check_connections ();
1071 GCP_add_path_to_all (path, GNUNET_NO);
1073 /* Count connections */
1074 connection_count = GCT_count_connections (peer->tunnel);
1076 /* If we already have our minimum (or more) connections, it's enough */
1077 if (CONNECTIONS_PER_TUNNEL <= connection_count)
1079 GCC_check_connections ();
1083 if (CADET_TUNNEL_SEARCHING == GCT_get_cstate (peer->tunnel))
1085 LOG (GNUNET_ERROR_TYPE_DEBUG, " ... connect!\n");
1088 GCC_check_connections ();
1093 * Adjust core requested size to accomodate an ACK.
1095 * @param message_size Requested size.
1097 * @return Size enough to fit @c message_size and an ACK.
1100 get_core_size (size_t message_size)
1102 return message_size + sizeof (struct GNUNET_CADET_ACK);
1106 * Test if a message type is connection management traffic
1107 * or regular payload traffic.
1109 * @param type Message type.
1111 * @return #GNUNET_YES if connection management, #GNUNET_NO otherwise.
1114 is_connection_management (uint16_t type)
1116 return type == GNUNET_MESSAGE_TYPE_CADET_ACK ||
1117 type == GNUNET_MESSAGE_TYPE_CADET_POLL;
1122 * Fill a core buffer with the appropriate data for the queued message.
1124 * @param queue Queue element for the message.
1125 * @param buf Core buffer to fill.
1126 * @param size Size remaining in @c buf.
1127 * @param[out] pid In case its an encrypted payload, set payload.
1129 * @return Bytes written to @c buf.
1132 fill_buf (struct CadetPeerQueue *queue, void *buf, size_t size, uint32_t *pid)
1134 struct CadetConnection *c = queue->c;
1137 switch (queue->type)
1139 case GNUNET_MESSAGE_TYPE_CADET_AX:
1140 *pid = GCC_get_pid (queue->c, queue->fwd);
1141 LOG (GNUNET_ERROR_TYPE_DEBUG, " ax payload ID %u\n", *pid);
1142 msg_size = send_core_data_raw (queue->cls, size, buf);
1143 ((struct GNUNET_CADET_AX *) buf)->pid = htonl (*pid);
1145 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY:
1146 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN:
1147 case GNUNET_MESSAGE_TYPE_CADET_KX:
1148 case GNUNET_MESSAGE_TYPE_CADET_ACK:
1149 case GNUNET_MESSAGE_TYPE_CADET_POLL:
1150 LOG (GNUNET_ERROR_TYPE_DEBUG, " raw %s\n", GC_m2s (queue->type));
1151 msg_size = send_core_data_raw (queue->cls, size, buf);
1153 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE:
1154 LOG (GNUNET_ERROR_TYPE_DEBUG, " path create\n");
1155 if (GCC_is_origin (c, GNUNET_YES))
1156 msg_size = send_core_connection_create (c, size, buf);
1158 msg_size = send_core_data_raw (queue->cls, size, buf);
1160 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK:
1161 LOG (GNUNET_ERROR_TYPE_DEBUG, " path ack\n");
1162 if (GCC_is_origin (c, GNUNET_NO) ||
1163 GCC_is_origin (c, GNUNET_YES))
1165 msg_size = send_core_connection_ack (c, size, buf);
1169 msg_size = send_core_data_raw (queue->cls, size, buf);
1172 case GNUNET_MESSAGE_TYPE_CADET_DATA:
1173 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_CREATE:
1174 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_DESTROY:
1175 /* This should be encapsulted */
1181 LOG (GNUNET_ERROR_TYPE_WARNING, " type unknown: %u\n", queue->type);
1185 GNUNET_assert (size >= msg_size);
1192 * Debug function should NEVER return true in production code, useful to
1193 * simulate losses for testcases.
1195 * @param q Queue handle with info about the message.
1197 * @return #GNUNET_YES or #GNUNET_NO with the decision to drop.
1200 should_I_drop (struct CadetPeerQueue *q)
1202 if (0 == drop_percent)
1205 if (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, 101) < drop_percent)
1213 * Core callback to write a queued packet to core buffer
1215 * @param cls Closure (peer info).
1216 * @param size Number of bytes available in buf.
1217 * @param buf Where the to write the message.
1219 * @return number of bytes written to buf
1222 queue_send (void *cls, size_t size, void *buf)
1224 struct CadetPeer *peer = cls;
1225 struct CadetConnection *c;
1226 struct CadetPeerQueue *queue;
1227 struct GNUNET_TIME_Relative core_wait_time;
1229 const struct GNUNET_PeerIdentity *dst_id;
1236 GCC_check_connections ();
1237 LOG (GNUNET_ERROR_TYPE_DEBUG, "\n");
1238 LOG (GNUNET_ERROR_TYPE_DEBUG, "\n");
1239 LOG (GNUNET_ERROR_TYPE_DEBUG, "Queue send towards %s (max %u)\n",
1240 GCP_2s (peer), size);
1242 /* Sanity checking */
1243 if (NULL == buf || 0 == size)
1245 LOG (GNUNET_ERROR_TYPE_DEBUG, " not allowed/\n");
1246 if (GNUNET_NO == in_shutdown)
1248 queue = peer_get_first_message (peer);
1251 peer->core_transmit = NULL;
1252 peer->tmt_time.abs_value_us = 0;
1253 GCC_check_connections ();
1256 dst_id = GNUNET_PEER_resolve2 (peer->id);
1257 peer->core_transmit =
1258 GNUNET_CORE_notify_transmit_ready (core_handle,
1259 GNUNET_NO, get_priority (queue),
1260 GNUNET_TIME_UNIT_FOREVER_REL,
1262 get_core_size (queue->size),
1265 peer->tmt_time = GNUNET_TIME_absolute_get ();
1269 peer->core_transmit = NULL;
1270 peer->tmt_time.abs_value_us = 0;
1272 GCC_check_connections ();
1281 peer->core_transmit = NULL;
1282 queue = peer_get_first_message (peer);
1285 GNUNET_break (0); /* Core tmt_rdy should've been canceled */
1286 peer->tmt_time.abs_value_us = 0;
1289 core_wait_time = GNUNET_TIME_absolute_get_duration (peer->tmt_time);
1290 wait_s = GNUNET_STRINGS_relative_time_to_string (core_wait_time, GNUNET_YES);
1291 if (core_wait_time.rel_value_us >= 1000000)
1293 LOG (GNUNET_ERROR_TYPE_WARNING,
1294 " %s: core wait time %s (> 1 second) for %u bytes\n",
1295 GCP_2s (peer), wait_s, queue->size);
1297 peer->tmt_time.abs_value_us = 0;
1299 /* Copy all possible messages to the core buffer */
1300 while (NULL != queue && rest >= queue->size)
1304 LOG (GNUNET_ERROR_TYPE_DEBUG, " on conn %s %s\n",
1305 GCC_2s (c), GC_f2s(queue->fwd));
1306 LOG (GNUNET_ERROR_TYPE_DEBUG, " size %u ok (%u/%u)\n",
1307 queue->size, total_size, size);
1309 msg_size = fill_buf (queue, (void *) dst, size, &pid);
1311 if (should_I_drop (queue))
1313 LOG (GNUNET_ERROR_TYPE_WARNING, "DD %s (%s %u) on conn %s %s\n",
1314 GC_m2s (queue->type), GC_m2s (queue->payload_type),
1315 queue->payload_id, GCC_2s (c), GC_f2s (queue->fwd));
1320 LOG (GNUNET_ERROR_TYPE_INFO,
1321 ">>> %s (%s %4u) on conn %s (%p) %s [%5u], after %s\n",
1322 GC_m2s (queue->type), GC_m2s (queue->payload_type),
1323 queue->payload_id, GCC_2s (c), c,
1324 GC_f2s (queue->fwd), msg_size, wait_s);
1326 total_size += msg_size;
1328 dst = &dst[msg_size];
1331 /* Free queue, but cls was freed by send_core_* in fill_buf. */
1332 (void) GCP_queue_destroy (queue, GNUNET_NO, GNUNET_YES, pid);
1335 queue = peer_get_first_message (peer);
1338 /* If more data in queue, send next */
1341 LOG (GNUNET_ERROR_TYPE_DEBUG, " more data! (%u)\n", queue->size);
1342 if (NULL == peer->core_transmit)
1344 dst_id = GNUNET_PEER_resolve2 (peer->id);
1345 peer->core_transmit =
1346 GNUNET_CORE_notify_transmit_ready (core_handle,
1347 GNUNET_NO, get_priority (queue),
1348 GNUNET_TIME_UNIT_FOREVER_REL,
1350 get_core_size (queue->size),
1353 peer->tmt_time = GNUNET_TIME_absolute_get ();
1354 queue->start_waiting = GNUNET_TIME_absolute_get ();
1358 LOG (GNUNET_ERROR_TYPE_DEBUG, "* tmt rdy called somewhere else\n");
1360 // GCC_start_poll (); FIXME needed?
1364 // GCC_stop_poll(); FIXME needed?
1367 LOG (GNUNET_ERROR_TYPE_DEBUG, " return %d\n", total_size);
1368 queue_debug (peer, GNUNET_ERROR_TYPE_DEBUG);
1369 GCC_check_connections ();
1374 /******************************************************************************/
1375 /******************************** API ***********************************/
1376 /******************************************************************************/
1380 * Free a transmission that was already queued with all resources
1381 * associated to the request.
1383 * If connection was marked to be destroyed, and this was the last queued
1384 * message on it, the connection will be free'd as a result.
1386 * @param queue Queue handler to cancel.
1387 * @param clear_cls Is it necessary to free associated cls?
1388 * @param sent Was it really sent? (Could have been canceled)
1389 * @param pid PID, if relevant (was sent and was a payload message).
1391 * @return #GNUNET_YES if connection was destroyed as a result,
1392 * #GNUNET_NO otherwise.
1395 GCP_queue_destroy (struct CadetPeerQueue *queue,
1400 struct CadetPeer *peer;
1401 int connection_destroyed;
1403 GCC_check_connections ();
1405 LOG (GNUNET_ERROR_TYPE_DEBUG, "queue destroy %s\n", GC_m2s (queue->type));
1406 if (GNUNET_YES == clear_cls)
1408 LOG (GNUNET_ERROR_TYPE_DEBUG, " free cls\n");
1409 switch (queue->type)
1411 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY:
1412 LOG (GNUNET_ERROR_TYPE_INFO, "destroying a DESTROY message\n");
1414 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK:
1415 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE:
1416 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN:
1417 case GNUNET_MESSAGE_TYPE_CADET_KX:
1418 case GNUNET_MESSAGE_TYPE_CADET_AX:
1419 case GNUNET_MESSAGE_TYPE_CADET_ACK:
1420 case GNUNET_MESSAGE_TYPE_CADET_POLL:
1421 GNUNET_free_non_null (queue->cls);
1426 LOG (GNUNET_ERROR_TYPE_ERROR, " type %s unknown!\n",
1427 GC_m2s (queue->type));
1430 GNUNET_CONTAINER_DLL_remove (peer->queue_head, peer->queue_tail, queue);
1432 if (!is_connection_management (queue->type))
1437 if (NULL != queue->cont)
1439 struct GNUNET_TIME_Relative wait_time;
1441 wait_time = GNUNET_TIME_absolute_get_duration (queue->start_waiting);
1442 LOG (GNUNET_ERROR_TYPE_DEBUG, " calling callback, time elapsed %s\n",
1443 GNUNET_STRINGS_relative_time_to_string (wait_time, GNUNET_NO));
1444 connection_destroyed = queue->cont (queue->cont_cls,
1445 queue->c, sent, queue->type, pid,
1446 queue->fwd, queue->size, wait_time);
1450 connection_destroyed = GNUNET_NO;
1453 if (NULL == peer_get_first_message (peer) && NULL != peer->core_transmit)
1455 GNUNET_CORE_notify_transmit_ready_cancel (peer->core_transmit);
1456 peer->core_transmit = NULL;
1457 peer->tmt_time.abs_value_us = 0;
1460 GNUNET_free (queue);
1461 GCC_check_connections ();
1462 return connection_destroyed;
1467 * @brief Queue and pass message to core when possible.
1469 * @param peer Peer towards which to queue the message.
1470 * @param cls Closure (@c type dependant). It will be used by queue_send to
1471 * build the message to be sent if not already prebuilt.
1472 * @param type Type of the message.
1473 * @param payload_type Type of the message's payload
1474 * 0 if the message is a retransmission (unknown payload).
1475 * UINT16_MAX if the message does not have payload.
1476 * @param payload_id ID of the payload (MID, ACK #, etc)
1477 * @param size Size of the message.
1478 * @param c Connection this message belongs to (can be NULL).
1479 * @param fwd Is this a message going root->dest? (FWD ACK are NOT FWD!)
1480 * @param cont Continuation to be called once CORE has taken the message.
1481 * @param cont_cls Closure for @c cont.
1483 * @return Handle to cancel the message before it is sent. Once cont is called
1484 * message has been sent and therefore the handle is no longer valid.
1486 struct CadetPeerQueue *
1487 GCP_queue_add (struct CadetPeer *peer,
1490 uint16_t payload_type,
1491 uint32_t payload_id,
1493 struct CadetConnection *c,
1498 struct CadetPeerQueue *q;
1502 GCC_check_connections ();
1503 LOG (GNUNET_ERROR_TYPE_DEBUG,
1504 "que %s (%s %4u) on conn %s (%p) %s towards %s (size %u)\n",
1505 GC_m2s (type), GC_m2s (payload_type), payload_id,
1506 GCC_2s (c), c, GC_f2s (fwd), GCP_2s (peer), size);
1508 if (NULL == peer->connections)
1510 /* We are not connected to this peer, ignore request. */
1511 LOG (GNUNET_ERROR_TYPE_INFO, "%s not a neighbor\n", GCP_2s (peer));
1512 GNUNET_STATISTICS_update (stats, "# messages dropped due to wrong hop", 1,
1518 if (is_connection_management (type))
1522 LOG (GNUNET_ERROR_TYPE_DEBUG, "priority %d\n", priority);
1524 call_core = (NULL == c || GNUNET_MESSAGE_TYPE_CADET_KX == type) ?
1525 GNUNET_YES : GCC_is_sendable (c, fwd);
1526 q = GNUNET_new (struct CadetPeerQueue);
1529 q->payload_type = payload_type;
1530 q->payload_id = payload_id;
1536 q->cont_cls = cont_cls;
1539 GNUNET_CONTAINER_DLL_insert_tail (peer->queue_head, peer->queue_tail, q);
1544 GNUNET_CONTAINER_DLL_insert (peer->queue_head, peer->queue_tail, q);
1545 call_core = GNUNET_YES;
1548 q->start_waiting = GNUNET_TIME_absolute_get ();
1549 if (NULL == peer->core_transmit && GNUNET_YES == call_core)
1551 LOG (GNUNET_ERROR_TYPE_DEBUG,
1552 "calling core tmt rdy towards %s for %u bytes\n",
1553 GCP_2s (peer), size);
1554 peer->core_transmit =
1555 GNUNET_CORE_notify_transmit_ready (core_handle,
1556 GNUNET_NO, get_priority (q),
1557 GNUNET_TIME_UNIT_FOREVER_REL,
1558 GNUNET_PEER_resolve2 (peer->id),
1559 get_core_size (size),
1561 peer->tmt_time = GNUNET_TIME_absolute_get ();
1563 else if (GNUNET_NO == call_core)
1565 LOG (GNUNET_ERROR_TYPE_DEBUG, "core tmt rdy towards %s not needed\n",
1571 struct GNUNET_TIME_Relative elapsed;
1572 elapsed = GNUNET_TIME_absolute_get_duration (peer->tmt_time);
1573 LOG (GNUNET_ERROR_TYPE_DEBUG, "core tmt rdy towards %s already called %s\n",
1575 GNUNET_STRINGS_relative_time_to_string (elapsed, GNUNET_NO));
1578 queue_debug (peer, GNUNET_ERROR_TYPE_DEBUG);
1579 GCC_check_connections ();
1585 * Cancel all queued messages to a peer that belong to a certain connection.
1587 * @param peer Peer towards whom to cancel.
1588 * @param c Connection whose queued messages to cancel. Might be destroyed by
1589 * the sent continuation call.
1592 GCP_queue_cancel (struct CadetPeer *peer,
1593 struct CadetConnection *c)
1595 struct CadetPeerQueue *q;
1596 struct CadetPeerQueue *next;
1597 struct CadetPeerQueue *prev;
1598 int connection_destroyed;
1600 GCC_check_connections ();
1601 connection_destroyed = GNUNET_NO;
1602 for (q = peer->queue_head; NULL != q; q = next)
1607 LOG (GNUNET_ERROR_TYPE_DEBUG,
1608 "GMP queue cancel %s\n",
1610 GNUNET_assert (GNUNET_NO == connection_destroyed);
1611 if (GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY == q->type)
1617 connection_destroyed = GCP_queue_destroy (q, GNUNET_YES, GNUNET_NO, 0);
1620 /* Get next from prev, q->next might be already freed:
1621 * queue destroy -> callback -> GCC_destroy -> cancel_queues -> here
1624 next = peer->queue_head;
1634 if ( (NULL == peer->queue_head) &&
1635 (NULL != peer->core_transmit) )
1637 GNUNET_CORE_notify_transmit_ready_cancel (peer->core_transmit);
1638 peer->core_transmit = NULL;
1639 peer->tmt_time.abs_value_us = 0;
1641 GCC_check_connections ();
1646 * Get the first transmittable message for a connection.
1648 * @param peer Neighboring peer.
1649 * @param c Connection.
1651 * @return First transmittable message.
1653 static struct CadetPeerQueue *
1654 connection_get_first_message (struct CadetPeer *peer, struct CadetConnection *c)
1656 struct CadetPeerQueue *q;
1658 for (q = peer->queue_head; NULL != q; q = q->next)
1662 if (queue_is_sendable (q))
1664 LOG (GNUNET_ERROR_TYPE_DEBUG, " sendable!!\n");
1667 LOG (GNUNET_ERROR_TYPE_DEBUG, " not sendable\n");
1675 * Get the first message for a connection and unqueue it.
1677 * Only tunnel (or higher) level messages are unqueued. Connection specific
1678 * messages are silently destroyed upon encounter.
1680 * @param peer Neighboring peer.
1681 * @param c Connection.
1682 * @param destroyed[in/out] Was the connection destroyed (prev/as a result)?.
1685 * @return First message for this connection.
1687 struct GNUNET_MessageHeader *
1688 GCP_connection_pop (struct CadetPeer *peer,
1689 struct CadetConnection *c,
1692 struct CadetPeerQueue *q;
1693 struct CadetPeerQueue *next;
1694 struct GNUNET_MessageHeader *msg;
1697 GCC_check_connections ();
1698 GNUNET_assert (NULL != destroyed);
1699 LOG (GNUNET_ERROR_TYPE_DEBUG, "connection_pop on conn %p\n", c);
1700 for (q = peer->queue_head; NULL != q; q = next)
1705 LOG (GNUNET_ERROR_TYPE_DEBUG, " - queued: %s (%s %u), cont: %p\n",
1706 GC_m2s (q->type), GC_m2s (q->payload_type), q->payload_id,
1710 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE:
1711 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK:
1712 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY:
1713 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN:
1714 case GNUNET_MESSAGE_TYPE_CADET_ACK:
1715 case GNUNET_MESSAGE_TYPE_CADET_POLL:
1716 dest = GCP_queue_destroy (q, GNUNET_YES, GNUNET_NO, 0);
1717 if (GNUNET_YES == dest)
1719 GNUNET_break (GNUNET_NO == *destroyed);
1720 *destroyed = GNUNET_YES;
1724 case GNUNET_MESSAGE_TYPE_CADET_KX:
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)
1799 LOG (GNUNET_ERROR_TYPE_DEBUG,
1801 in_shutdown = GNUNET_NO;
1802 peers = GNUNET_CONTAINER_multipeermap_create (128, GNUNET_NO);
1804 GNUNET_CONFIGURATION_get_value_number (c, "CADET", "MAX_PEERS",
1807 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_WARNING,
1808 "CADET", "MAX_PEERS", "USING DEFAULT");
1813 GNUNET_CONFIGURATION_get_value_number (c, "CADET", "DROP_PERCENT",
1820 LOG (GNUNET_ERROR_TYPE_WARNING, "**************************************\n");
1821 LOG (GNUNET_ERROR_TYPE_WARNING, "Cadet is running with DROP enabled.\n");
1822 LOG (GNUNET_ERROR_TYPE_WARNING, "This is NOT a good idea!\n");
1823 LOG (GNUNET_ERROR_TYPE_WARNING, "Remove DROP_PERCENT from config file.\n");
1824 LOG (GNUNET_ERROR_TYPE_WARNING, "**************************************\n");
1826 ats_ch = GNUNET_ATS_connectivity_init (c);
1827 core_handle = GNUNET_CORE_connect (c, /* Main configuration */
1828 NULL, /* Closure passed to CADET functions */
1829 &core_init, /* Call core_init once connected */
1830 &core_connect, /* Handle connects */
1831 &core_disconnect, /* remove peers on disconnects */
1832 NULL, /* Don't notify about all incoming messages */
1833 GNUNET_NO, /* For header only in notification */
1834 NULL, /* Don't notify about all outbound messages */
1835 GNUNET_NO, /* For header-only out notification */
1836 core_handlers); /* Register these handlers */
1837 if (NULL == core_handle)
1840 GNUNET_SCHEDULER_shutdown ();
1848 * Shut down the peer subsystem.
1853 LOG (GNUNET_ERROR_TYPE_DEBUG,
1854 "Shutting down peer subsystem\n");
1855 in_shutdown = GNUNET_YES;
1856 GNUNET_CONTAINER_multipeermap_iterate (peers,
1859 if (NULL != core_handle)
1861 GNUNET_CORE_disconnect (core_handle);
1866 GNUNET_ATS_connectivity_done (ats_ch);
1869 GNUNET_PEER_change_rc (myid, -1);
1870 GNUNET_CONTAINER_multipeermap_destroy (peers);
1876 * Retrieve the CadetPeer stucture associated with the peer. Optionally create
1877 * one and insert it in the appropriate structures if the peer is not known yet.
1879 * @param peer_id Full identity of the peer.
1880 * @param create #GNUNET_YES if a new peer should be created if unknown.
1881 * #GNUNET_NO otherwise.
1883 * @return Existing or newly created peer structure.
1884 * NULL if unknown and not requested @a create
1887 GCP_get (const struct GNUNET_PeerIdentity *peer_id, int create)
1889 struct CadetPeer *peer;
1891 peer = GNUNET_CONTAINER_multipeermap_get (peers, peer_id);
1894 peer = GNUNET_new (struct CadetPeer);
1895 if (GNUNET_CONTAINER_multipeermap_size (peers) > max_peers)
1897 peer_delete_oldest ();
1899 GNUNET_assert (GNUNET_OK ==
1900 GNUNET_CONTAINER_multipeermap_put (peers,
1903 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
1904 peer->id = GNUNET_PEER_intern (peer_id);
1906 peer->last_contact = GNUNET_TIME_absolute_get ();
1913 * Retrieve the CadetPeer stucture associated with the
1914 * peer. Optionally create one and insert it in the appropriate
1915 * structures if the peer is not known yet.
1917 * @param peer Short identity of the peer.
1918 * @param create #GNUNET_YES if a new peer should be created if unknown.
1919 * #GNUNET_NO otherwise.
1921 * @return Existing or newly created peer structure.
1922 * NULL if unknown and not requested @a create
1925 GCP_get_short (const GNUNET_PEER_Id peer, int create)
1927 return GCP_get (GNUNET_PEER_resolve2 (peer), create);
1932 * Function called once #GNUNET_TRANSPORT_offer_hello() is done.
1933 * Marks the operation as finished.
1935 * @param cls Closure (our `struct CadetPeer`).
1938 hello_offer_done (void *cls)
1940 struct CadetPeer *peer = cls;
1942 peer->hello_offer = NULL;
1947 * Try to establish a new connection to this peer (in its tunnel).
1948 * If the peer doesn't have any path to it yet, try to get one.
1949 * If the peer already has some path, send a CREATE CONNECTION towards it.
1951 * @param peer Peer to connect to.
1954 GCP_connect (struct CadetPeer *peer)
1956 struct CadetTunnel *t;
1957 struct CadetPeerPath *path;
1958 struct CadetConnection *c;
1961 GCC_check_connections ();
1962 LOG (GNUNET_ERROR_TYPE_DEBUG,
1963 "peer_connect towards %s\n",
1965 /* If we have a current hello, try to connect using it. */
1966 GCP_try_connect (peer);
1970 rerun_search = GNUNET_NO;
1972 if (NULL != peer->path_head)
1974 LOG (GNUNET_ERROR_TYPE_DEBUG, " some path exists\n");
1975 path = peer_get_best_path (peer);
1981 LOG (GNUNET_ERROR_TYPE_DEBUG, " path to use: %s\n", s);
1984 c = GCT_use_path (t, path);
1987 /* This case can happen when the path includes a first hop that is
1988 * not yet known to be connected.
1990 * This happens quite often during testing when running cadet
1991 * under valgrind: core connect notifications come very late
1992 * and the DHT result has already come and created a valid
1993 * path. In this case, the peer->connections
1994 * hashmaps will be NULL and tunnel_use_path will not be able
1995 * to create a connection from that path.
1997 * Re-running the DHT GET should give core time to callback.
1999 * GCT_use_path -> GCC_new -> register_neighbors takes care of
2000 * updating statistics about this issue.
2002 rerun_search = GNUNET_YES;
2006 GCC_send_create (c);
2012 LOG (GNUNET_ERROR_TYPE_DEBUG, " but is NULL, all paths are in use\n");
2016 if (GNUNET_YES == rerun_search)
2018 struct GNUNET_TIME_Relative delay;
2020 GCP_stop_search (peer);
2021 delay = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS, 100);
2022 peer->search_delayed = GNUNET_SCHEDULER_add_delayed (delay,
2025 GCC_check_connections ();
2029 if (GNUNET_NO == is_searching (peer))
2030 GCP_start_search (peer);
2031 GCC_check_connections ();
2036 * Chech whether there is a direct (core level) connection to peer.
2038 * @param peer Peer to check.
2040 * @return #GNUNET_YES if there is a direct connection.
2043 GCP_is_neighbor (const struct CadetPeer *peer)
2045 struct CadetPeerPath *path;
2047 if (NULL == peer->connections)
2050 for (path = peer->path_head; NULL != path; path = path->next)
2052 if (3 > path->length)
2056 /* Is not a neighbor but connections is not NULL, probably disconnecting */
2063 * Create and initialize a new tunnel towards a peer, in case it has none.
2064 * In case the peer already has a tunnel, nothing is done.
2066 * Does not generate any traffic, just creates the local data structures.
2068 * @param peer Peer towards which to create the tunnel.
2071 GCP_add_tunnel (struct CadetPeer *peer)
2073 GCC_check_connections ();
2074 if (NULL != peer->tunnel)
2076 peer->tunnel = GCT_new (peer);
2077 GCC_check_connections ();
2082 * Add a connection to a neighboring peer.
2084 * Store that the peer is the first hop of the connection in one
2085 * direction and that on peer disconnect the connection must be
2086 * notified and destroyed, for it will no longer be valid.
2088 * @param peer Peer to add connection to.
2089 * @param c Connection to add.
2090 * @param pred #GNUNET_YES if we are predecessor, #GNUNET_NO if we are successor
2093 GCP_add_connection (struct CadetPeer *peer,
2094 struct CadetConnection *c,
2097 LOG (GNUNET_ERROR_TYPE_DEBUG,
2098 "adding connection %s\n",
2100 LOG (GNUNET_ERROR_TYPE_DEBUG,
2103 GNUNET_assert (NULL != peer->connections);
2104 GNUNET_assert (GNUNET_OK ==
2105 GNUNET_CONTAINER_multihashmap_put (peer->connections,
2108 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
2109 LOG (GNUNET_ERROR_TYPE_DEBUG,
2110 "Peer %s has now %u connections.\n",
2112 GNUNET_CONTAINER_multihashmap_size (peer->connections));
2117 * Add the path to the peer and update the path used to reach it in case this
2120 * @param peer Destination peer to add the path to.
2121 * @param path New path to add. Last peer must be @c peer.
2122 * Path will be either used of freed if already known.
2123 * @param trusted Do we trust that this path is real?
2125 * @return path if path was taken, pointer to existing duplicate if exists
2128 struct CadetPeerPath *
2129 GCP_add_path (struct CadetPeer *peer,
2130 struct CadetPeerPath *path,
2133 struct CadetPeerPath *aux;
2137 GCC_check_connections ();
2138 LOG (GNUNET_ERROR_TYPE_DEBUG,
2139 "adding path [%u] to peer %s\n",
2140 path->length, GCP_2s (peer));
2142 if (NULL == peer || NULL == path
2143 || path->peers[path->length - 1] != peer->id)
2146 path_destroy (path);
2150 for (l = 1; l < path->length; l++)
2152 if (path->peers[l] == myid)
2154 LOG (GNUNET_ERROR_TYPE_DEBUG, " shortening path by %u\n", l);
2155 for (l2 = 0; l2 < path->length - l; l2++)
2157 path->peers[l2] = path->peers[l + l2];
2161 path->peers = GNUNET_realloc (path->peers,
2162 path->length * sizeof (GNUNET_PEER_Id));
2166 LOG (GNUNET_ERROR_TYPE_DEBUG, " final length: %u\n", path->length);
2168 if (2 >= path->length && GNUNET_NO == trusted)
2170 /* Only allow CORE to tell us about direct paths */
2171 path_destroy (path);
2175 l = path_get_length (path);
2178 path_destroy (path);
2182 GNUNET_assert (peer->id == path->peers[path->length - 1]);
2183 for (aux = peer->path_head; aux != NULL; aux = aux->next)
2185 l2 = path_get_length (aux);
2188 LOG (GNUNET_ERROR_TYPE_DEBUG, " added\n");
2189 GNUNET_CONTAINER_DLL_insert_before (peer->path_head,
2190 peer->path_tail, aux, path);
2195 if (l2 == l && memcmp (path->peers, aux->peers, l) == 0)
2197 LOG (GNUNET_ERROR_TYPE_DEBUG, " already known\n");
2198 path_destroy (path);
2203 GNUNET_CONTAINER_DLL_insert_tail (peer->path_head,
2206 LOG (GNUNET_ERROR_TYPE_DEBUG, " added last\n");
2209 if (NULL != peer->tunnel
2210 && CONNECTIONS_PER_TUNNEL > GCT_count_connections (peer->tunnel)
2211 && 2 < path->length) /* Direct paths are handled by core_connect */
2215 GCC_check_connections ();
2221 * Add the path to the origin peer and update the path used to reach it in case
2222 * this is the shortest.
2223 * The path is given in peer_info -> destination, therefore we turn the path
2224 * upside down first.
2226 * @param peer Peer to add the path to, being the origin of the path.
2227 * @param path New path to add after being inversed.
2228 * Path will be either used or freed.
2229 * @param trusted Do we trust that this path is real?
2231 * @return path if path was taken, pointer to existing duplicate if exists
2234 struct CadetPeerPath *
2235 GCP_add_path_to_origin (struct CadetPeer *peer,
2236 struct CadetPeerPath *path,
2242 return GCP_add_path (peer, path, trusted);
2247 * Adds a path to the info of all the peers in the path
2249 * @param p Path to process.
2250 * @param confirmed Whether we know if the path works or not.
2253 GCP_add_path_to_all (const struct CadetPeerPath *p, int confirmed)
2257 /* TODO: invert and add */
2258 GCC_check_connections ();
2259 for (i = 0; i < p->length && p->peers[i] != myid; i++) /* skip'em */ ;
2260 for (i++; i < p->length; i++)
2262 struct CadetPeer *peer;
2263 struct CadetPeerPath *copy;
2265 peer = GCP_get_short (p->peers[i], GNUNET_YES);
2266 copy = path_duplicate (p);
2267 copy->length = i + 1;
2268 GCP_add_path (peer, copy, 3 > p->length ? GNUNET_NO : confirmed);
2270 GCC_check_connections ();
2275 * Remove any path to the peer that has the exact same peers as the one given.
2277 * @param peer Peer to remove the path from.
2278 * @param path Path to remove. Is always destroyed .
2281 GCP_remove_path (struct CadetPeer *peer,
2282 struct CadetPeerPath *path)
2284 struct CadetPeerPath *iter;
2285 struct CadetPeerPath *next;
2287 GCC_check_connections ();
2288 GNUNET_assert (myid == path->peers[0]);
2289 GNUNET_assert (peer->id == path->peers[path->length - 1]);
2291 LOG (GNUNET_ERROR_TYPE_INFO,
2292 "Removing path %p (%u) from %s\n",
2293 path, path->length, GCP_2s (peer));
2295 for (iter = peer->path_head; NULL != iter; iter = next)
2298 if (0 == path_cmp (path, iter))
2300 GNUNET_CONTAINER_DLL_remove (peer->path_head,
2304 path_destroy (iter);
2307 path_destroy (path);
2308 GCC_check_connections ();
2313 * Check that we are aware of a connection from a neighboring peer.
2315 * @param peer Peer to the connection is with
2316 * @param c Connection that should be in the map with this peer.
2319 GCP_check_connection (const struct CadetPeer *peer,
2320 const struct CadetConnection *c)
2322 GNUNET_assert (NULL != peer);
2323 GNUNET_assert (NULL != peer->connections);
2325 GNUNET_assert (GNUNET_YES ==
2326 GNUNET_CONTAINER_multihashmap_contains_value (peer->connections,
2333 * Remove a connection from a neighboring peer.
2335 * @param peer Peer to remove connection from.
2336 * @param c Connection to remove.
2339 GCP_remove_connection (struct CadetPeer *peer,
2340 const struct CadetConnection *c)
2342 LOG (GNUNET_ERROR_TYPE_DEBUG,
2343 "Removing connection %s\n",
2345 LOG (GNUNET_ERROR_TYPE_DEBUG,
2348 if ( (NULL == peer) ||
2349 (NULL == peer->connections) )
2351 GNUNET_assert (GNUNET_YES ==
2352 GNUNET_CONTAINER_multihashmap_remove (peer->connections,
2355 LOG (GNUNET_ERROR_TYPE_DEBUG,
2356 "Peer %s remains with %u connections.\n",
2358 GNUNET_CONTAINER_multihashmap_size (peer->connections));
2363 * Start the DHT search for new paths towards the peer: we don't have
2364 * enough good connections.
2366 * @param peer Destination peer.
2369 GCP_start_search (struct CadetPeer *peer)
2371 const struct GNUNET_PeerIdentity *id;
2372 struct CadetTunnel *t = peer->tunnel;
2374 GCC_check_connections ();
2375 if (NULL != peer->search_h)
2381 if (NULL != peer->search_delayed)
2382 GCP_stop_search (peer);
2384 id = GNUNET_PEER_resolve2 (peer->id);
2385 peer->search_h = GCD_search (id, &search_handler, peer);
2389 /* Why would we search for a peer with no tunnel towards it? */
2394 if (CADET_TUNNEL_NEW == GCT_get_cstate (t)
2395 || 0 == GCT_count_any_connections (t))
2397 GCT_change_cstate (t, CADET_TUNNEL_SEARCHING);
2399 GCC_check_connections ();
2404 * Stop the DHT search for new paths towards the peer: we already have
2405 * enough good connections.
2407 * @param peer Destination peer.
2410 GCP_stop_search (struct CadetPeer *peer)
2412 GCC_check_connections ();
2413 if (NULL != peer->search_h)
2415 GCD_search_stop (peer->search_h);
2416 peer->search_h = NULL;
2418 if (NULL != peer->search_delayed)
2420 GNUNET_SCHEDULER_cancel (peer->search_delayed);
2421 peer->search_delayed = NULL;
2423 GCC_check_connections ();
2428 * Get the Full ID of a peer.
2430 * @param peer Peer to get from.
2432 * @return Full ID of peer.
2434 const struct GNUNET_PeerIdentity *
2435 GCP_get_id (const struct CadetPeer *peer)
2437 return GNUNET_PEER_resolve2 (peer->id);
2442 * Get the Short ID of a peer.
2444 * @param peer Peer to get from.
2446 * @return Short ID of peer.
2449 GCP_get_short_id (const struct CadetPeer *peer)
2458 * If tunnel is NULL and there was a search active, stop it, as it's useless.
2464 GCP_set_tunnel (struct CadetPeer *peer, struct CadetTunnel *t)
2467 if (NULL == t && GNUNET_YES == is_searching (peer))
2469 GCP_stop_search (peer);
2475 * Get the tunnel towards a peer.
2477 * @param peer Peer to get from.
2479 * @return Tunnel towards peer.
2481 struct CadetTunnel *
2482 GCP_get_tunnel (const struct CadetPeer *peer)
2486 return peer->tunnel;
2491 * Set the hello message.
2493 * @param peer Peer whose message to set.
2494 * @param hello Hello message.
2497 GCP_set_hello (struct CadetPeer *peer,
2498 const struct GNUNET_HELLO_Message *hello)
2500 struct GNUNET_HELLO_Message *old;
2503 GCC_check_connections ();
2504 LOG (GNUNET_ERROR_TYPE_DEBUG, "set hello for %s\n", GCP_2s (peer));
2508 old = GCP_get_hello (peer);
2511 size = GNUNET_HELLO_size (hello);
2512 peer->hello = GNUNET_malloc (size);
2513 GNUNET_memcpy (peer->hello, hello, size);
2517 peer->hello = GNUNET_HELLO_merge (old, hello);
2520 GCC_check_connections ();
2525 * Get the hello message.
2527 * @param peer Peer whose message to get.
2529 * @return Hello message.
2531 struct GNUNET_HELLO_Message *
2532 GCP_get_hello (struct CadetPeer *peer)
2534 struct GNUNET_TIME_Absolute expiration;
2535 struct GNUNET_TIME_Relative remaining;
2537 if (NULL == peer->hello)
2540 expiration = GNUNET_HELLO_get_last_expiration (peer->hello);
2541 remaining = GNUNET_TIME_absolute_get_remaining (expiration);
2542 if (0 == remaining.rel_value_us)
2544 LOG (GNUNET_ERROR_TYPE_DEBUG, " get - hello expired on %s\n",
2545 GNUNET_STRINGS_absolute_time_to_string (expiration));
2546 GNUNET_free (peer->hello);
2554 * Try to connect to a peer on TRANSPORT level.
2556 * @param peer Peer to whom to connect.
2559 GCP_try_connect (struct CadetPeer *peer)
2561 struct GNUNET_HELLO_Message *hello;
2562 struct GNUNET_MessageHeader *mh;
2565 GNUNET_CONFIGURATION_get_value_yesno (cfg,
2567 "DISABLE_TRY_CONNECT"))
2569 GCC_check_connections ();
2570 if (GNUNET_YES == GCP_is_neighbor (peer))
2572 hello = GCP_get_hello (peer);
2576 mh = GNUNET_HELLO_get_header (hello);
2577 if (NULL != peer->hello_offer)
2579 GNUNET_TRANSPORT_offer_hello_cancel (peer->hello_offer);
2580 peer->hello_offer = NULL;
2582 peer->hello_offer = GNUNET_TRANSPORT_offer_hello (cfg,
2586 if (NULL == peer->connectivity_suggestion)
2587 peer->connectivity_suggestion
2588 = GNUNET_ATS_connectivity_suggest (ats_ch,
2589 GNUNET_PEER_resolve2 (peer->id),
2591 GCC_check_connections ();
2596 * Notify a peer that a link between two other peers is broken. If any path
2597 * used that link, eliminate it.
2599 * @param peer Peer affected by the change.
2600 * @param peer1 Peer whose link is broken.
2601 * @param peer2 Peer whose link is broken.
2604 GCP_notify_broken_link (struct CadetPeer *peer,
2605 const struct GNUNET_PeerIdentity *peer1,
2606 const struct GNUNET_PeerIdentity *peer2)
2608 struct CadetPeerPath *iter;
2609 struct CadetPeerPath *next;
2614 GCC_check_connections ();
2615 p1 = GNUNET_PEER_search (peer1);
2616 p2 = GNUNET_PEER_search (peer2);
2618 LOG (GNUNET_ERROR_TYPE_DEBUG, "Link %u-%u broken\n", p1, p2);
2619 if (0 == p1 || 0 == p2)
2621 /* We don't even know them */
2625 for (iter = peer->path_head; NULL != iter; iter = next)
2628 for (i = 0; i < iter->length - 1; i++)
2630 if ((iter->peers[i] == p1 && iter->peers[i + 1] == p2)
2631 || (iter->peers[i] == p2 && iter->peers[i + 1] == p1))
2636 LOG (GNUNET_ERROR_TYPE_DEBUG, " - invalidating %s\n", s);
2639 path_invalidate (iter);
2643 GCC_check_connections ();
2648 * Count the number of known paths toward the peer.
2650 * @param peer Peer to get path info.
2652 * @return Number of known paths.
2655 GCP_count_paths (const struct CadetPeer *peer)
2657 struct CadetPeerPath *iter;
2660 for (iter = peer->path_head, i = 0; NULL != iter; iter = iter->next)
2668 * Iterate over the paths to a peer.
2670 * @param peer Peer to get path info.
2671 * @param callback Function to call for every path.
2672 * @param cls Closure for @a callback.
2674 * @return Number of iterated paths.
2677 GCP_iterate_paths (struct CadetPeer *peer,
2678 GCP_path_iterator callback,
2681 struct CadetPeerPath *iter;
2684 for (iter = peer->path_head, i = 0; NULL != iter; iter = iter->next)
2687 if (GNUNET_YES != callback (cls, peer, iter))
2696 * Iterate all known peers.
2698 * @param iter Iterator.
2699 * @param cls Closure for @c iter.
2702 GCP_iterate_all (GNUNET_CONTAINER_PeerMapIterator iter,
2705 GCC_check_connections ();
2706 GNUNET_CONTAINER_multipeermap_iterate (peers,
2709 GCC_check_connections ();
2714 * Get the static string for a peer ID.
2718 * @return Static string for it's ID.
2721 GCP_2s (const struct CadetPeer *peer)
2725 return GNUNET_i2s (GNUNET_PEER_resolve2 (peer->id));
2729 /* end of gnunet-service-cadet_peer.c */