2 This file is part of GNUnet.
3 (C) 2013 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
23 #include "gnunet_util_lib.h"
25 #include "gnunet_core_service.h"
26 #include "gnunet_statistics_service.h"
28 #include "mesh_protocol_enc.h"
30 #include "gnunet-service-mesh_peer.h"
31 #include "gnunet-service-mesh_dht.h"
32 #include "gnunet-service-mesh_connection.h"
33 #include "gnunet-service-mesh_local.h"
34 #include "gnunet-service-mesh_tunnel.h"
35 #include "mesh_path.h"
37 #define LOG(level, ...) GNUNET_log_from (level,"mesh-p2p",__VA_ARGS__)
39 /******************************************************************************/
40 /******************************** STRUCTS **********************************/
41 /******************************************************************************/
44 * Struct containing info about a queued transmission to this peer
51 struct MeshPeerQueue *next;
56 struct MeshPeerQueue *prev;
59 * Peer this transmission is directed to.
61 struct MeshPeer *peer;
64 * Connection this message belongs to.
66 struct MeshConnection *c;
74 * Channel this message belongs to, if known.
76 struct MeshChannel *ch;
79 * Pointer to info stucture used as cls.
94 * Set when this message starts waiting for CORE.
96 struct GNUNET_TIME_Absolute start_waiting;
99 * Function to call on sending.
104 * Closure for callback.
110 * Struct containing all information regarding a given peer
120 * Last time we heard from this peer
122 struct GNUNET_TIME_Absolute last_contact;
125 * Paths to reach the peer, ordered by ascending hop count
127 struct MeshPeerPath *path_head;
130 * Paths to reach the peer, ordered by ascending hop count
132 struct MeshPeerPath *path_tail;
135 * Handle to stop the DHT search for paths to this peer
137 struct GMD_search_handle *search_h;
140 * Tunnel to this peer, if any.
142 struct MeshTunnel3 *tunnel;
145 * Connections that go through this peer, indexed by tid;
147 struct GNUNET_CONTAINER_MultiHashMap *connections;
150 * Handle for queued transmissions
152 struct GNUNET_CORE_TransmitHandle *core_transmit;
155 * Transmission queue to core DLL head
157 struct MeshPeerQueue *queue_head;
160 * Transmission queue to core DLL tail
162 struct MeshPeerQueue *queue_tail;
165 * How many messages are in the queue to this peer.
167 unsigned int queue_n;
171 /******************************************************************************/
172 /******************************* GLOBALS ***********************************/
173 /******************************************************************************/
176 * Global handle to the statistics service.
178 extern struct GNUNET_STATISTICS_Handle *stats;
181 * Local peer own ID (full value).
183 extern struct GNUNET_PeerIdentity my_full_id;
186 * Local peer own ID (short)
188 extern GNUNET_PEER_Id myid;
191 * Peers known, indexed by PeerIdentity (MeshPeer).
193 static struct GNUNET_CONTAINER_MultiPeerMap *peers;
196 * How many peers do we want to remember?
198 static unsigned long long max_peers;
201 * Percentage of messages that will be dropped (for test purposes only).
203 static unsigned long long drop_percent;
206 * Handle to communicate with core.
208 static struct GNUNET_CORE_Handle *core_handle;
211 /******************************************************************************/
212 /***************************** CORE CALLBACKS *********************************/
213 /******************************************************************************/
217 * Iterator to notify all connections of a broken link. Mark connections
218 * to destroy after all traffic has been sent.
220 * @param cls Closure (peer disconnected).
221 * @param key Current key code (peer id).
222 * @param value Value in the hash map (connection).
224 * @return GNUNET_YES if we should continue to iterate,
228 notify_broken (void *cls,
229 const struct GNUNET_HashCode *key,
232 struct MeshPeer *peer = cls;
233 struct MeshConnection *c = value;
235 GMC_notify_broken (c, peer, &my_full_id);
242 * Method called whenever a given peer connects.
245 * @param peer peer identity this notification is about
248 core_connect (void *cls, const struct GNUNET_PeerIdentity *peer)
251 struct MeshPeerPath *path;
253 LOG ("Peer connected\n");
254 LOG (" %s\n", GNUNET_i2s (&my_full_id));
263 LOG (" %s\n", GNUNET_i2s (peer));
265 path->peers[1] = pi->id;
266 GNUNET_PEER_change_rc (pi->id, 1);
267 GNUNET_STATISTICS_update (stats, "# peers", 1, GNUNET_NO);
269 path->peers[0] = myid;
270 GNUNET_PEER_change_rc (myid, 1);
271 peer_add_path (pi, path, GNUNET_YES);
273 pi->connections = GNUNET_CONTAINER_multihashmap_create (32, GNUNET_YES);
279 * Method called whenever a peer disconnects.
282 * @param peer peer identity this notification is about
285 core_disconnect (void *cls, const struct GNUNET_PeerIdentity *peer)
289 LOG ("Peer disconnected\n");
290 pi = GNUNET_CONTAINER_multipeermap_get (peers, peer);
297 GNUNET_CONTAINER_multihashmap_iterate (pi->connections, ¬ify_broken, pi);
298 GNUNET_CONTAINER_multihashmap_destroy (pi->connections);
299 pi->connections = NULL;
300 if (NULL != pi->core_transmit)
302 GNUNET_CORE_notify_transmit_ready_cancel (pi->core_transmit);
303 pi->core_transmit = NULL;
309 GNUNET_STATISTICS_update (stats, "# peers", -1, GNUNET_NO);
316 * Functions to handle messages from core
318 static struct GNUNET_CORE_MessageHandler core_handlers[] = {
319 {&GMC_handle_create, GNUNET_MESSAGE_TYPE_MESH_CONNECTION_CREATE,
321 {&GMC_handle_confirm, GNUNET_MESSAGE_TYPE_MESH_CONNECTION_ACK,
322 sizeof (struct GNUNET_MESH_ConnectionACK)},
323 {&GMC_handle_broken, GNUNET_MESSAGE_TYPE_MESH_CONNECTION_BROKEN,
324 sizeof (struct GNUNET_MESH_ConnectionBroken)},
325 {&GMC_handle_destroy, GNUNET_MESSAGE_TYPE_MESH_CONNECTION_DESTROY,
326 sizeof (struct GNUNET_MESH_ConnectionDestroy)},
327 {&GMC_handle_keepalive, GNUNET_MESSAGE_TYPE_MESH_FWD_KEEPALIVE,
328 sizeof (struct GNUNET_MESH_ConnectionKeepAlive)},
329 {&GMC_handle_keepalive, GNUNET_MESSAGE_TYPE_MESH_BCK_KEEPALIVE,
330 sizeof (struct GNUNET_MESH_ConnectionKeepAlive)},
331 {&GMC_handle_ack, GNUNET_MESSAGE_TYPE_MESH_ACK,
332 sizeof (struct GNUNET_MESH_ACK)},
333 {&GMC_handle_poll, GNUNET_MESSAGE_TYPE_MESH_POLL,
334 sizeof (struct GNUNET_MESH_Poll)},
335 {&GMC_handle_fwd, GNUNET_MESSAGE_TYPE_MESH_FWD, 0},
336 {&GMC_handle_bck, GNUNET_MESSAGE_TYPE_MESH_BCK, 0},
342 * To be called on core init/fail.
344 * @param cls Closure (config)
345 * @param identity the public identity of this peer
348 core_init (void *cls,
349 const struct GNUNET_PeerIdentity *identity)
351 const struct GNUNET_CONFIGURATION_Handle *c = cls;
354 LOG (GNUNET_ERROR_TYPE_DEBUG, "Core init\n");
355 if (0 != memcmp (identity, &my_full_id, sizeof (my_full_id)))
357 LOG (GNUNET_ERROR_TYPE_ERROR, _("Wrong CORE service\n"));
358 LOG (GNUNET_ERROR_TYPE_ERROR, " core id %s\n", GNUNET_i2s (identity));
359 LOG (GNUNET_ERROR_TYPE_ERROR, " my id %s\n", GNUNET_i2s (&my_full_id));
360 GNUNET_CORE_disconnect (core_handle);
361 core_handle = GNUNET_CORE_connect (c, /* Main configuration */
362 NULL, /* Closure passed to MESH functions */
363 &core_init, /* Call core_init once connected */
364 &core_connect, /* Handle connects */
365 &core_disconnect, /* remove peers on disconnects */
366 NULL, /* Don't notify about all incoming messages */
367 GNUNET_NO, /* For header only in notification */
368 NULL, /* Don't notify about all outbound messages */
369 GNUNET_NO, /* For header-only out notification */
370 core_handlers); /* Register these handlers */
379 * Core callback to write a pre-constructed data packet to core buffer
381 * @param cls Closure (MeshTransmissionDescriptor with data in "data" member).
382 * @param size Number of bytes available in buf.
383 * @param buf Where the to write the message.
385 * @return number of bytes written to buf
388 send_core_data_raw (void *cls, size_t size, void *buf)
390 struct GNUNET_MessageHeader *msg = cls;
393 GNUNET_assert (NULL != msg);
394 total_size = ntohs (msg->size);
396 if (total_size > size)
401 memcpy (buf, msg, total_size);
408 * Function to send a create connection message to a peer.
410 * @param c Connection to create.
411 * @param size number of bytes available in buf
412 * @param buf where the callee should write the message
413 * @return number of bytes written to buf
416 send_core_connection_create (struct MeshConnection *c, size_t size, void *buf)
418 struct GNUNET_MESH_ConnectionCreate *msg;
419 struct GNUNET_PeerIdentity *peer_ptr;
420 struct MeshPeerPath *p = c->path;
424 LOG (GNUNET_ERROR_TYPE_DEBUG, "Sending CONNECTION CREATE...\n");
426 sizeof (struct GNUNET_MESH_ConnectionCreate) +
427 p->length * sizeof (struct GNUNET_PeerIdentity);
429 if (size < size_needed || NULL == buf)
434 msg = (struct GNUNET_MESH_ConnectionCreate *) buf;
435 msg->header.size = htons (size_needed);
436 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CONNECTION_CREATE);
439 peer_ptr = (struct GNUNET_PeerIdentity *) &msg[1];
440 for (i = 0; i < p->length; i++)
442 GNUNET_PEER_resolve (p->peers[i], peer_ptr++);
445 LOG (GNUNET_ERROR_TYPE_DEBUG,
446 "CONNECTION CREATE (%u bytes long) sent!\n", size_needed);
452 * Creates a path ack message in buf and frees all unused resources.
454 * @param c Connection to send an ACK on.
455 * @param size number of bytes available in buf
456 * @param buf where the callee should write the message
458 * @return number of bytes written to buf
461 send_core_connection_ack (struct MeshConnection *c, size_t size, void *buf)
463 struct GNUNET_MESH_ConnectionACK *msg = buf;
464 struct MeshTunnel3 *t = c->t;
466 LOG (GNUNET_ERROR_TYPE_DEBUG, "Sending CONNECTION ACK...\n");
467 GNUNET_assert (NULL != t);
468 if (sizeof (struct GNUNET_MESH_ConnectionACK) > size)
473 msg->header.size = htons (sizeof (struct GNUNET_MESH_ConnectionACK));
474 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CONNECTION_ACK);
478 /* TODO add signature */
480 LOG (GNUNET_ERROR_TYPE_DEBUG, "CONNECTION ACK sent!\n");
481 return sizeof (struct GNUNET_MESH_ConnectionACK);
485 /******************************************************************************/
486 /******************************** STATIC ***********************************/
487 /******************************************************************************/
490 * Iterator over tunnel hash map entries to destroy the tunnel during shutdown.
493 * @param key current key code
494 * @param value value in the hash map
495 * @return #GNUNET_YES if we should continue to iterate,
499 shutdown_tunnel (void *cls,
500 const struct GNUNET_PeerIdentity *key,
503 struct MeshPeer *p = value;
504 struct MeshTunnel3 *t = p->tunnel;
514 * Destroy the peer_info and free any allocated resources linked to it
516 * @param peer The peer_info to destroy.
518 * @return GNUNET_OK on success
521 peer_destroy (struct MeshPeer *peer)
523 struct GNUNET_PeerIdentity id;
524 struct MeshPeerPath *p;
525 struct MeshPeerPath *nextp;
527 GNUNET_PEER_resolve (peer->id, &id);
528 GNUNET_PEER_change_rc (peer->id, -1);
531 GNUNET_CONTAINER_multipeermap_remove (peers, &id, peer))
534 LOG (GNUNET_ERROR_TYPE_WARNING,
535 "removing peer %s, not in peermap\n", GNUNET_i2s (&id));
537 if (NULL != peer->search_h)
539 GMD_search_stop (peer->search_h);
545 GNUNET_CONTAINER_DLL_remove (peer->path_head, peer->path_tail, p);
549 tunnel_destroy_empty (peer->tunnel);
556 * Returns if peer is used (has a tunnel, is neighbor).
558 * @peer Peer to check.
560 * @return GNUNET_YES if peer is in use.
563 peer_is_used (struct MeshPeer *peer)
565 struct MeshPeerPath *p;
567 if (NULL != peer->tunnel)
570 for (p = peer->path_head; NULL != p; p = p->next)
580 * Iterator over all the peers to get the oldest timestamp.
582 * @param cls Closure (unsued).
583 * @param key ID of the peer.
584 * @param value Peer_Info of the peer.
587 peer_get_oldest (void *cls,
588 const struct GNUNET_PeerIdentity *key,
591 struct MeshPeer *p = value;
592 struct GNUNET_TIME_Absolute *abs = cls;
594 /* Don't count active peers */
595 if (GNUNET_YES == peer_is_used (p))
598 if (abs->abs_value_us < p->last_contact.abs_value_us)
599 abs->abs_value_us = p->last_contact.abs_value_us;
606 * Iterator over all the peers to remove the oldest entry.
608 * @param cls Closure (unsued).
609 * @param key ID of the peer.
610 * @param value Peer_Info of the peer.
613 peer_timeout (void *cls,
614 const struct GNUNET_PeerIdentity *key,
617 struct MeshPeer *p = value;
618 struct GNUNET_TIME_Absolute *abs = cls;
620 if (p->last_contact.abs_value_us == abs->abs_value_us &&
621 GNUNET_NO == peer_is_used (p))
631 * Delete oldest unused peer.
634 peer_delete_oldest (void)
636 struct GNUNET_TIME_Absolute abs;
638 abs = GNUNET_TIME_UNIT_FOREVER_ABS;
640 GNUNET_CONTAINER_multipeermap_iterate (peers,
643 GNUNET_CONTAINER_multipeermap_iterate (peers,
650 * Get a cost of a path for a peer considering existing tunnel connections.
652 * @param peer Peer towards which the path is considered.
653 * @param path Candidate path.
655 * @return Cost of the path (path length + number of overlapping nodes)
658 peer_get_path_cost (const struct MeshPeer *peer,
659 const struct MeshPeerPath *path)
661 struct MeshConnection *c;
662 unsigned int overlap;
670 GNUNET_assert (NULL != peer->tunnel);
672 for (i = 0; i < path->length; i++)
674 for (c = peer->tunnel->connection_head; NULL != c; c = c->next)
676 for (j = 0; j < c->path->length; j++)
678 if (path->peers[i] == c->path->peers[j])
686 return (path->length + overlap) * (path->score * -1);
691 * Choose the best path towards a peer considering the tunnel properties.
693 * @param peer The destination peer.
695 * @return Best current known path towards the peer, if any.
697 static struct MeshPeerPath *
698 peer_get_best_path (const struct MeshPeer *peer)
700 struct MeshPeerPath *best_p;
701 struct MeshPeerPath *p;
702 unsigned int best_cost;
705 best_cost = UINT_MAX;
707 for (p = peer->path_head; NULL != p; p = p->next)
709 if (GNUNET_YES == GMT_is_path_used (peer->tunnel, p))
710 continue; /* If path is already in use, skip it. */
712 if ((cost = peer_get_path_cost (peer, p)) < best_cost)
723 queue_is_sendable (struct MeshPeerQueue *q)
725 /* Is PID-independent? */
728 case GNUNET_MESSAGE_TYPE_MESH_ACK:
729 case GNUNET_MESSAGE_TYPE_MESH_POLL:
733 if (GMC_is_sendable (q->c, q->fwd))
741 * Get first sendable message.
743 * @param peer The destination peer.
745 * @return Best current known path towards the peer, if any.
747 static struct MeshPeerQueue *
748 peer_get_first_message (const struct MeshPeer *peer)
750 struct MeshPeerQueue *q;
752 for (q = peer->queue_head; NULL != q; q = q->next)
754 if (queue_is_sendable (q))
763 * Function to process paths received for a new peer addition. The recorded
764 * paths form the initial tunnel, which can be optimized later.
765 * Called on each result obtained for the DHT search.
771 search_handler (void *cls, const struct MeshPeerPath *path)
773 struct MeshPeer *peer = cls;
774 unsigned int connection_count;
776 GMP_add_path_to_all (path, GNUNET_NO);
778 /* Count connections */
779 connection_count = GMT_count_connections (peer->tunnel);
781 /* If we already have 3 (or more (?!)) connections, it's enough */
782 if (3 <= connection_count)
785 if (MESH_TUNNEL3_SEARCHING == GMT_get_state (peer->tunnel))
787 LOG (GNUNET_ERROR_TYPE_DEBUG, " ... connect!\n");
795 * Free a transmission that was already queued with all resources
796 * associated to the request.
798 * @param queue Queue handler to cancel.
799 * @param clear_cls Is it necessary to free associated cls?
802 queue_destroy (struct MeshPeerQueue *queue, int clear_cls)
804 struct MeshPeer *peer;
807 GNUNET_assert (NULL != queue->c);
809 if (GNUNET_YES == clear_cls)
811 LOG (GNUNET_ERROR_TYPE_DEBUG, "# queue destroy type %s\n",
812 GNUNET_MESH_DEBUG_M2S (queue->type));
815 case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_DESTROY:
816 case GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY:
817 LOG (GNUNET_ERROR_TYPE_INFO, "destroying a DESTROY message\n");
819 case GNUNET_MESSAGE_TYPE_MESH_FWD:
820 case GNUNET_MESSAGE_TYPE_MESH_BCK:
821 case GNUNET_MESSAGE_TYPE_MESH_ACK:
822 case GNUNET_MESSAGE_TYPE_MESH_POLL:
823 case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_ACK:
824 case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_CREATE:
825 case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_BROKEN:
826 LOG (GNUNET_ERROR_TYPE_DEBUG, "# prebuilt message\n");;
827 GNUNET_free_non_null (queue->cls);
832 LOG (GNUNET_ERROR_TYPE_ERROR, "# type %s unknown!\n",
833 GNUNET_MESH_DEBUG_M2S (queue->type));
836 GNUNET_CONTAINER_DLL_remove (peer->queue_head, peer->queue_tail, queue);
838 if (queue->type != GNUNET_MESSAGE_TYPE_MESH_ACK &&
839 queue->type != GNUNET_MESSAGE_TYPE_MESH_POLL)
844 if (NULL != queue->callback)
846 LOG (GNUNET_ERROR_TYPE_DEBUG, "# Calling callback\n");
847 queue->callback (queue->callback_cls,
848 queue->c, queue->type,
849 queue->fwd, queue->size,
850 GNUNET_TIME_absolute_get_duration (queue->start_waiting));
857 * Core callback to write a queued packet to core buffer
859 * @param cls Closure (peer info).
860 * @param size Number of bytes available in buf.
861 * @param buf Where the to write the message.
863 * @return number of bytes written to buf
866 queue_send (void *cls, size_t size, void *buf)
868 struct MeshPeer *peer = cls;
869 struct MeshConnection *c;
870 struct MeshPeerQueue *queue;
871 const struct GNUNET_PeerIdentity *dst_id;
874 peer->core_transmit = NULL;
875 LOG (GNUNET_ERROR_TYPE_DEBUG, "* Queue send (max %u)\n", size);
877 if (NULL == buf || 0 == size)
879 LOG (GNUNET_ERROR_TYPE_DEBUG, "* Buffer size 0.\n");
884 queue = peer_get_first_message (peer);
887 GNUNET_break (0); /* Core tmt_rdy should've been canceled */
892 dst_id = GNUNET_PEER_resolve2 (peer->id);
893 LOG (GNUNET_ERROR_TYPE_DEBUG, "* towards %s\n", GNUNET_i2s (dst_id));
894 /* Check if buffer size is enough for the message */
895 if (queue->size > size)
897 LOG (GNUNET_ERROR_TYPE_DEBUG, "* not enough room, reissue\n");
898 peer->core_transmit =
899 GNUNET_CORE_notify_transmit_ready (core_handle,
902 GNUNET_TIME_UNIT_FOREVER_REL,
909 LOG (GNUNET_ERROR_TYPE_DEBUG, "* size %u ok\n", queue->size);
914 case GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY:
915 case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_DESTROY:
916 case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_BROKEN:
917 case GNUNET_MESSAGE_TYPE_MESH_FWD:
918 case GNUNET_MESSAGE_TYPE_MESH_BCK:
919 case GNUNET_MESSAGE_TYPE_MESH_ACK:
920 case GNUNET_MESSAGE_TYPE_MESH_POLL:
921 LOG (GNUNET_ERROR_TYPE_DEBUG,
923 GNUNET_MESH_DEBUG_M2S (queue->type));
924 data_size = send_core_data_raw (queue->cls, size, buf);
926 case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_CREATE:
927 LOG (GNUNET_ERROR_TYPE_DEBUG, "* path create\n");
928 if (GMC_is_origin (c, GNUNET_YES))
929 data_size = send_core_connection_create (queue->c, size, buf);
931 data_size = send_core_data_raw (queue->cls, size, buf);
933 case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_ACK:
934 LOG (GNUNET_ERROR_TYPE_DEBUG, "* path ack\n");
935 if (GMC_is_origin (c, GNUNET_NO) ||
936 GMC_is_origin (c, GNUNET_YES))
937 data_size = send_core_connection_ack (queue->c, size, buf);
939 data_size = send_core_data_raw (queue->cls, size, buf);
941 case GNUNET_MESSAGE_TYPE_MESH_DATA:
942 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE:
943 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY:
944 /* This should be encapsulted */
950 LOG (GNUNET_ERROR_TYPE_WARNING, "* type unknown: %u\n",
955 if (0 < drop_percent &&
956 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, 101) < drop_percent)
958 LOG (GNUNET_ERROR_TYPE_WARNING,
959 "Dropping message of type %s\n",
960 GNUNET_MESH_DEBUG_M2S (queue->type));
964 /* Free queue, but cls was freed by send_core_* */
965 queue_destroy (queue, GNUNET_NO);
967 /* If more data in queue, send next */
968 queue = peer_get_first_message (peer);
971 LOG (GNUNET_ERROR_TYPE_DEBUG, "* more data!\n");
972 if (NULL == peer->core_transmit)
974 peer->core_transmit =
975 GNUNET_CORE_notify_transmit_ready(core_handle,
978 GNUNET_TIME_UNIT_FOREVER_REL,
983 queue->start_waiting = GNUNET_TIME_absolute_get ();
987 LOG (GNUNET_ERROR_TYPE_DEBUG,
988 "* tmt rdy called somewhere else\n");
990 // GMC_start_poll (); FIXME needed?
994 // GMC_stop_poll(); FIXME needed?
997 LOG (GNUNET_ERROR_TYPE_DEBUG, "* Return %d\n", data_size);
1002 /******************************************************************************/
1003 /******************************** API ***********************************/
1004 /******************************************************************************/
1007 * @brief Queue and pass message to core when possible.
1009 * @param peer Peer towards which to queue the message.
1010 * @param cls Closure (@c type dependant). It will be used by queue_send to
1011 * build the message to be sent if not already prebuilt.
1012 * @param type Type of the message, 0 for a raw message.
1013 * @param size Size of the message.
1014 * @param c Connection this message belongs to (cannot be NULL).
1015 * @param ch Channel this message belongs to, if applicable (otherwise NULL).
1016 * @param fwd Is this a message going root->dest? (FWD ACK are NOT FWD!)
1017 * @param cont Continuation to be called once CORE has taken the message.
1018 * @param cont_cls Closure for @c cont.
1021 GMP_queue_add (struct MeshPeer *peer, void *cls, uint16_t type, size_t size,
1022 struct MeshConnection *c, struct MeshChannel *ch, int fwd,
1023 GMP_sent cont, void *cont_cls)
1025 struct MeshPeerQueue *queue;
1029 LOG (GNUNET_ERROR_TYPE_DEBUG,
1030 "queue add %s %s (%u) on c %p, ch %p\n",
1031 fwd ? "FWD" : "BCK", GNUNET_MESH_DEBUG_M2S (type), size, c, ch);
1032 GNUNET_assert (NULL != c);
1034 if (NULL == peer->connections)
1036 /* We are not connected to this peer, ignore request. */
1037 GNUNET_break_op (0);
1043 if (GNUNET_MESSAGE_TYPE_MESH_POLL == type ||
1044 GNUNET_MESSAGE_TYPE_MESH_ACK == type)
1049 LOG (GNUNET_ERROR_TYPE_DEBUG, "priority %d\n", priority);
1051 call_core = GMC_is_sendable (c, fwd);
1052 queue = GNUNET_malloc (sizeof (struct MeshPeerQueue));
1060 queue->callback = cont;
1061 queue->callback_cls = cont_cls;
1062 if (100 <= priority)
1064 struct MeshPeerQueue *copy;
1065 struct MeshPeerQueue *next;
1067 for (copy = peer->queue_head; NULL != copy; copy = next)
1070 if (copy->type == type && copy->c == c && copy->fwd == fwd)
1072 /* Example: also a FWD ACK for connection XYZ */
1073 queue_destroy (copy, GNUNET_YES);
1076 GNUNET_CONTAINER_DLL_insert (peer->queue_head, peer->queue_tail, queue);
1080 GNUNET_CONTAINER_DLL_insert_tail (peer->queue_head, peer->queue_tail, queue);
1084 if (NULL == peer->core_transmit && GNUNET_YES == call_core)
1086 LOG (GNUNET_ERROR_TYPE_DEBUG,
1087 "calling core tmt rdy towards %s for %u bytes\n",
1088 GMP_2s (peer), size);
1089 peer->core_transmit =
1090 GNUNET_CORE_notify_transmit_ready (core_handle,
1093 GNUNET_TIME_UNIT_FOREVER_REL,
1094 GNUNET_PEER_resolve2 (peer->id),
1098 queue->start_waiting = GNUNET_TIME_absolute_get ();
1102 LOG (GNUNET_ERROR_TYPE_DEBUG,
1103 "core tmt rdy towards %s already called\n",
1111 * Cancel all queued messages to a peer that belong to a certain connection.
1113 * @param peer Peer towards whom to cancel.
1114 * @param c Connection whose queued messages to cancel.
1117 GMP_queue_cancel (struct MeshPeer *peer, struct MeshConnection *c)
1119 struct MeshPeerQueue *q;
1120 struct MeshPeerQueue *next;
1122 for (q = peer->queue_head; NULL != q; q = next)
1127 LOG (GNUNET_ERROR_TYPE_DEBUG,
1128 "connection_cancel_queue %s\n",
1129 GNUNET_MESH_DEBUG_M2S (q->type));
1130 queue_destroy (q, GNUNET_YES);
1133 if (NULL == peer->queue_head)
1135 if (NULL != peer->core_transmit)
1137 GNUNET_CORE_notify_transmit_ready_cancel (peer->core_transmit);
1138 peer->core_transmit = NULL;
1145 * Get the first transmittable message for a connection.
1147 * @param peer Neighboring peer.
1148 * @param c Connection.
1150 * @return First transmittable message.
1152 static struct MeshPeerQueue *
1153 connection_get_first_message (struct MeshPeer *peer, struct MeshConnection *c)
1155 struct MeshPeerQueue *q;
1157 for (q = peer->queue_head; NULL != q; q = q->next)
1161 if (queue_is_sendable (q))
1169 GMP_queue_unlock (struct MeshPeer *peer, struct MeshConnection *c)
1171 struct MeshPeerQueue *q;
1174 if (NULL != peer->core_transmit)
1176 LOG (GNUNET_ERROR_TYPE_DEBUG, " already unlocked!\n");
1177 return; /* Already unlocked */
1180 q = connection_get_first_message (peer, c);
1183 LOG (GNUNET_ERROR_TYPE_DEBUG, " queue empty!\n");
1184 return; /* Nothing to transmit */
1188 peer->core_transmit =
1189 GNUNET_CORE_notify_transmit_ready (core_handle,
1192 GNUNET_TIME_UNIT_FOREVER_REL,
1193 GNUNET_PEER_resolve2 (peer->id),
1201 * Initialize the peer subsystem.
1203 * @param c Configuration.
1204 * @param id Peer identity
1207 GMP_init (const struct GNUNET_CONFIGURATION_Handle *c)
1209 peers = GNUNET_CONTAINER_multipeermap_create (128, GNUNET_NO);
1211 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "MAX_PEERS",
1214 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_WARNING,
1215 "MESH", "MAX_PEERS", "USING DEFAULT");
1220 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "DROP_PERCENT",
1227 LOG (GNUNET_ERROR_TYPE_WARNING,
1228 "\n***************************************\n"
1229 "Mesh is running with drop mode enabled.\n"
1230 "This is NOT a good idea!\n"
1231 "Remove the DROP_PERCENT option from your configuration.\n"
1232 "***************************************\n");
1235 core_handle = GNUNET_CORE_connect (c, /* Main configuration */
1236 NULL, /* Closure passed to MESH functions */
1237 &core_init, /* Call core_init once connected */
1238 &core_connect, /* Handle connects */
1239 &core_disconnect, /* remove peers on disconnects */
1240 NULL, /* Don't notify about all incoming messages */
1241 GNUNET_NO, /* For header only in notification */
1242 NULL, /* Don't notify about all outbound messages */
1243 GNUNET_NO, /* For header-only out notification */
1244 core_handlers); /* Register these handlers */
1245 if (NULL == core_handle)
1248 GNUNET_SCHEDULER_shutdown ();
1254 * Shut down the peer subsystem.
1259 GNUNET_CONTAINER_multipeermap_iterate (peers, &shutdown_tunnel, NULL);
1261 if (core_handle != NULL)
1263 GNUNET_CORE_disconnect (core_handle);
1266 GNUNET_PEER_change_rc (myid, -1);
1270 * Retrieve the MeshPeer stucture associated with the peer, create one
1271 * and insert it in the appropriate structures if the peer is not known yet.
1273 * @param peer Full identity of the peer.
1275 * @return Existing or newly created peer structure.
1278 GMP_get (const struct GNUNET_PeerIdentity *peer_id)
1280 struct MeshPeer *peer;
1282 peer = GNUNET_CONTAINER_multipeermap_get (peers, peer_id);
1285 peer = GNUNET_new (struct MeshPeer);
1286 if (GNUNET_CONTAINER_multipeermap_size (peers) > max_peers)
1288 peer_delete_oldest ();
1290 GNUNET_CONTAINER_multipeermap_put (peers, peer_id, peer,
1291 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST);
1292 peer->id = GNUNET_PEER_intern (peer_id);
1294 peer->last_contact = GNUNET_TIME_absolute_get();
1301 * Retrieve the MeshPeer stucture associated with the peer, create one
1302 * and insert it in the appropriate structures if the peer is not known yet.
1304 * @param peer Short identity of the peer.
1306 * @return Existing or newly created peer structure.
1309 GMP_get_short (const GNUNET_PEER_Id peer)
1311 return GMP_get (GNUNET_PEER_resolve2 (peer));
1316 * Try to establish a new connection to this peer (in its tunnel).
1317 * If the peer doesn't have any path to it yet, try to get one.
1318 * If the peer already has some path, send a CREATE CONNECTION towards it.
1320 * @param peer Peer to connect to.
1323 GMP_connect (struct MeshPeer *peer)
1325 struct MeshTunnel3 *t;
1326 struct MeshPeerPath *p;
1327 struct MeshConnection *c;
1330 LOG (GNUNET_ERROR_TYPE_DEBUG,
1331 "peer_connect towards %s\n",
1335 rerun_search = GNUNET_NO;
1337 if (NULL != peer->path_head)
1339 LOG (GNUNET_ERROR_TYPE_DEBUG, "path exists\n");
1340 p = peer_get_best_path (peer);
1343 LOG (GNUNET_ERROR_TYPE_DEBUG, " %u hops\n", p->length);
1344 c = GMT_use_path (t, p);
1347 /* This case can happen when the path includes a first hop that is
1348 * not yet known to be connected.
1350 * This happens quite often during testing when running mesh
1351 * under valgrind: core connect notifications come very late and the
1352 * DHT result has already come and created a valid path.
1353 * In this case, the peer->connections hashmap will be NULL and
1354 * tunnel_use_path will not be able to create a connection from that
1357 * Re-running the DHT GET should give core time to callback.
1360 rerun_search = GNUNET_YES;
1364 GMC_send_create (c);
1370 if (NULL != peer->search_h && GNUNET_YES == rerun_search)
1372 GMD_search_stop (peer->search_h);
1373 peer->search_h = NULL;
1374 LOG (GNUNET_ERROR_TYPE_DEBUG,
1375 " Stopping DHT GET for peer %s\n",
1379 if (NULL == peer->search_h)
1381 const struct GNUNET_PeerIdentity *id;
1383 id = GNUNET_PEER_resolve2 (peer->id);
1384 LOG (GNUNET_ERROR_TYPE_DEBUG,
1385 " Starting DHT GET for peer %s\n", GMP_2s (peer));
1386 peer->search_h = GMD_search (id, &search_handler, peer);
1387 if (MESH_TUNNEL3_NEW == GMT_get_state (t))
1388 GMT_change_state (t, MESH_TUNNEL3_SEARCHING);
1400 GMP_set_tunnel (struct MeshPeer *peer, struct MeshTunnel3 *t)
1407 * Chech whether there is a direct (core level) connection to peer.
1409 * @param peer Peer to check.
1411 * @return GNUNET_YES if there is a direct connection.
1414 GMP_is_neighbor (const struct MeshPeer *peer)
1416 struct MeshPeerPath *path;
1418 if (NULL == peer->connections)
1421 for (path = peer->path_head; NULL != path; path = path->next)
1423 if (3 > path->length)
1427 GNUNET_break (0); /* Is not a neighbor but connections is not NULL */
1433 * Create and initialize a new tunnel towards a peer, in case it has none.
1435 * Does not generate any traffic, just creates the local data structures.
1437 * @param peer Peer towards which to create the tunnel.
1440 GMP_add_tunnel (struct MeshPeer *peer)
1442 if (NULL != peer->tunnel)
1444 peer->tunnel = GMT_new (peer);
1449 * Add a connection to a neighboring peer.
1451 * Store that the peer is the first hop of the connection in one
1452 * direction and that on peer disconnect the connection must be
1453 * notified and destroyed, for it will no longer be valid.
1455 * @param peer Peer to add connection to.
1456 * @param c Connection to add.
1458 * @return GNUNET_OK on success.
1461 GMP_add_connection (struct MeshPeer *peer,
1462 struct MeshConnection *c)
1464 if (NULL == peer->connections)
1467 return GNUNET_SYSERR;
1469 return GNUNET_CONTAINER_multihashmap_put (peer->connections,
1472 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST);
1477 * Add the path to the peer and update the path used to reach it in case this
1480 * @param peer_info Destination peer to add the path to.
1481 * @param path New path to add. Last peer must be the peer in arg 1.
1482 * Path will be either used of freed if already known.
1483 * @param trusted Do we trust that this path is real?
1486 GMP_add_path (struct MeshPeer *peer_info, struct MeshPeerPath *path,
1489 struct MeshPeerPath *aux;
1493 if ((NULL == peer_info) || (NULL == path))
1496 path_destroy (path);
1499 if (path->peers[path->length - 1] != peer_info->id)
1502 path_destroy (path);
1505 if (2 >= path->length && GNUNET_NO == trusted)
1507 /* Only allow CORE to tell us about direct paths */
1508 path_destroy (path);
1511 for (l = 1; l < path->length; l++)
1513 if (path->peers[l] == myid)
1515 LOG (GNUNET_ERROR_TYPE_DEBUG, "shortening path by %u\n", l);
1516 for (l2 = 0; l2 < path->length - l; l2++)
1518 path->peers[l2] = path->peers[l + l2];
1523 GNUNET_realloc (path->peers, path->length * sizeof (GNUNET_PEER_Id));
1527 LOG (GNUNET_ERROR_TYPE_DEBUG, "adding path [%u] to peer %s\n",
1528 path->length, GMP_2s (peer_info));
1530 l = path_get_length (path);
1533 path_destroy (path);
1537 GNUNET_assert (peer_info->id == path->peers[path->length - 1]);
1538 for (aux = peer_info->path_head; aux != NULL; aux = aux->next)
1540 l2 = path_get_length (aux);
1543 GNUNET_CONTAINER_DLL_insert_before (peer_info->path_head,
1544 peer_info->path_tail, aux, path);
1549 if (l2 == l && memcmp (path->peers, aux->peers, l) == 0)
1551 path_destroy (path);
1556 GNUNET_CONTAINER_DLL_insert_tail (peer_info->path_head, peer_info->path_tail,
1563 * Add the path to the origin peer and update the path used to reach it in case
1564 * this is the shortest.
1565 * The path is given in peer_info -> destination, therefore we turn the path
1566 * upside down first.
1568 * @param peer_info Peer to add the path to, being the origin of the path.
1569 * @param path New path to add after being inversed.
1570 * Path will be either used or freed.
1571 * @param trusted Do we trust that this path is real?
1574 GMP_add_path_to_origin (struct MeshPeer *peer,
1575 struct MeshPeerPath *path,
1581 GMP_add_path (peer, path, trusted);
1586 * Adds a path to the info of all the peers in the path
1588 * @param p Path to process.
1589 * @param confirmed Whether we know if the path works or not.
1592 GMP_add_path_to_all (const struct MeshPeerPath *p, int confirmed)
1596 /* TODO: invert and add */
1597 for (i = 0; i < p->length && p->peers[i] != myid; i++) /* skip'em */ ;
1598 for (i++; i < p->length; i++)
1600 struct MeshPeer *aux;
1601 struct MeshPeerPath *copy;
1603 aux = GMP_get_short (p->peers[i]);
1604 copy = path_duplicate (p);
1605 copy->length = i + 1;
1606 GMP_add_path (aux, copy, p->length < 3 ? GNUNET_NO : confirmed);
1612 * Remove a connection from a neighboring peer.
1614 * @param peer Peer to remove connection from.
1615 * @param c Connection to remove.
1617 * @return GNUNET_OK on success.
1620 GMP_remove_connection (struct MeshPeer *peer,
1621 const struct MeshConnection *c)
1623 if (NULL == peer || NULL == peer->connections)
1626 return GNUNET_SYSERR;
1628 return GNUNET_CONTAINER_multihashmap_remove (peer->connections,
1634 * Get the Full ID of a peer.
1636 * @param peer Peer to get from.
1638 * @return Full ID of peer.
1640 const struct GNUNET_PeerIdentity *
1641 GMP_get_id (const struct MeshPeer *peer)
1643 return GNUNET_PEER_resolve2 (peer->id);
1648 * Get the Short ID of a peer.
1650 * @param peer Peer to get from.
1652 * @return Short ID of peer.
1655 GMP_get_short_id (const struct MeshPeer *peer)
1662 * Get the static string for a peer ID.
1666 * @return Static string for it's ID.
1669 GMP_2s (const struct MeshPeer *peer)
1673 return GNUNET_i2s (GNUNET_PEER_resolve2 (peer->id));