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.
22 * @file dv/gnunet-service-dv.c
23 * @brief the distance vector service, primarily handles gossip of nearby
24 * peers and sending/receiving DV messages from core and decapsulating
27 * @author Christian Grothoff
28 * @author Nathan Evans
31 #include "gnunet_util_lib.h"
32 #include "gnunet_protocols.h"
33 #include "gnunet_core_service.h"
34 #include "gnunet_hello_lib.h"
35 #include "gnunet_peerinfo_service.h"
36 #include "gnunet_statistics_service.h"
37 #include "gnunet_set_service.h"
38 #include "gnunet_ats_service.h"
44 * How often do we establish the consensu?
46 #define GNUNET_DV_CONSENSUS_FREQUENCY GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_MINUTES, 5)
49 * Maximum number of messages we queue per peer.
51 #define MAX_QUEUE_SIZE 16
54 * Maximum number of messages we queue towards the clients/plugin.
56 #define MAX_QUEUE_SIZE_PLUGIN 1024
59 * The default fisheye depth, from how many hops away will
62 #define DEFAULT_FISHEYE_DEPTH 3
65 * How many hops is a direct neighbor away?
67 #define DIRECT_NEIGHBOR_COST 1
70 GNUNET_NETWORK_STRUCT_BEGIN
73 * Information about a peer DV can route to. These entries are what
74 * we use as the binary format to establish consensus to create our
75 * routing table and as the address format in the HELLOs.
81 * Identity of the peer we can reach.
83 struct GNUNET_PeerIdentity peer;
86 * How many hops (1-3) is this peer away? in network byte order
88 uint32_t distance GNUNET_PACKED;
94 * Message exchanged between DV services (via core), requesting a
95 * message to be routed.
100 * Type: GNUNET_MESSAGE_TYPE_DV_ROUTE
102 struct GNUNET_MessageHeader header;
105 * Expected (remaining) distance. Must be always smaller than
106 * #DEFAULT_FISHEYE_DEPTH, should be zero at the target. Must
107 * be decremented by one at each hop. Peers must not forward
108 * these messages further once the counter has reached zero.
110 uint32_t distance GNUNET_PACKED;
113 * The (actual) target of the message (this peer, if distance is zero).
115 struct GNUNET_PeerIdentity target;
118 * The (actual) sender of the message.
120 struct GNUNET_PeerIdentity sender;
124 GNUNET_NETWORK_STRUCT_END
128 * Linked list of messages to send to clients.
130 struct PendingMessage
133 * Pointer to next item in the list
135 struct PendingMessage *next;
138 * Pointer to previous item in the list
140 struct PendingMessage *prev;
143 * Actual message to be sent, allocated after this struct.
145 const struct GNUNET_MessageHeader *msg;
148 * Next target for the message (a neighbour of ours).
150 struct GNUNET_PeerIdentity next_target;
153 * Unique ID of the message.
161 * Information about a direct neighbor (core-level, excluding
162 * DV-links, only DV-enabled peers).
164 struct DirectNeighbor
168 * Identity of the peer.
170 struct GNUNET_PeerIdentity peer;
173 * Session ID we use whenever we create a set union with
174 * this neighbor; constructed from the XOR of our peer
175 * IDs and then salted with "DV-SALT" to avoid conflicts
176 * with other applications.
178 struct GNUNET_HashCode real_session_id;
181 * Head of linked list of messages to send to this peer.
183 struct PendingMessage *pm_head;
186 * Tail of linked list of messages to send to this peer.
188 struct PendingMessage *pm_tail;
191 * Transmit handle to core service.
193 struct GNUNET_CORE_TransmitHandle *cth;
196 * Routing table of the neighbor, NULL if not yet established.
197 * Keys are peer identities, values are 'struct Target' entries.
198 * Note that the distances in the targets are from the point-of-view
199 * of the peer, not from us!
201 struct GNUNET_CONTAINER_MultiPeerMap *neighbor_table;
204 * Updated routing table of the neighbor, under construction,
205 * NULL if we are not currently building it.
206 * Keys are peer identities, values are 'struct Target' entries.
207 * Note that the distances in the targets are from the point-of-view
208 * of the other peer, not from us!
210 struct GNUNET_CONTAINER_MultiPeerMap *neighbor_table_consensus;
213 * Our current (exposed) routing table as a set.
215 struct GNUNET_SET_Handle *my_set;
218 * Handle for our current active set union operation.
220 struct GNUNET_SET_OperationHandle *set_op;
223 * Handle used if we are listening for this peer, waiting for the
224 * other peer to initiate construction of the set union. NULL if
225 * we ar the initiating peer.
227 struct GNUNET_SET_ListenHandle *listen_handle;
230 * ID of the task we use to (periodically) update our consensus
231 * with this peer. Used if we are the initiating peer.
233 GNUNET_SCHEDULER_TaskIdentifier initiate_task;
236 * At what offset are we, with respect to inserting our own routes
237 * into the consensus?
239 unsigned int consensus_insertion_offset;
242 * At what distance are we, with respect to inserting our own routes
243 * into the consensus?
245 unsigned int consensus_insertion_distance;
248 * Number of messages currently in the 'pm_XXXX'-DLL.
250 unsigned int pm_queue_size;
253 * Elements in consensus
255 unsigned int consensus_elements;
258 * Direct one hop route
260 struct Route *direct_route;
263 * Flag set within 'check_target_removed' to trigger full global route refresh.
268 * Our distance to this peer, 0 for unknown.
273 * The network this peer is in
275 enum GNUNET_ATS_Network_Type network;
278 * Is this neighbor connected at the core level?
286 * A route includes information about the next hop,
287 * the target, and the ultimate distance to the
294 * Which peer do we need to forward the message to?
296 struct DirectNeighbor *next_hop;
299 * What would be the target, and how far is it away?
301 struct Target target;
304 * Offset of this target in the respective consensus set.
306 unsigned int set_offset;
312 * Set of targets we bring to a consensus; all targets in a set have a
313 * distance equal to the sets distance (which is implied by the array
320 * Array of targets in the set, may include NULL entries if a
321 * neighbor has disconnected; the targets are allocated with the
322 * respective container (all_routes), not here.
324 struct Route **targets;
327 * Size of the @e targets array.
329 unsigned int array_length;
335 * Peermap of all of our neighbors; processing these usually requires
336 * first checking to see if the peer is core-connected and if the
337 * distance is 1, in which case they are direct neighbors.
339 static struct GNUNET_CONTAINER_MultiPeerMap *direct_neighbors;
342 * Hashmap with all routes that we currently support; contains
343 * routing information for all peers from distance 2
344 * up to distance DEFAULT_FISHEYE_DEPTH.
346 static struct GNUNET_CONTAINER_MultiPeerMap *all_routes;
349 * Array of consensus sets we expose to the outside world. Sets
350 * are structured by the distance to the target.
352 static struct ConsensusSet consensi[DEFAULT_FISHEYE_DEPTH];
355 * Handle to the core service api.
357 static struct GNUNET_CORE_Handle *core_api;
360 * The identity of our peer.
362 static struct GNUNET_PeerIdentity my_identity;
365 * The configuration for this service.
367 static const struct GNUNET_CONFIGURATION_Handle *cfg;
370 * The client, the DV plugin connected to us (or an event monitor).
371 * Hopefully this client will never change, although if the plugin
372 * dies and returns for some reason it may happen.
374 static struct GNUNET_SERVER_NotificationContext *nc;
377 * Handle for the statistics service.
379 static struct GNUNET_STATISTICS_Handle *stats;
382 * Handle to ATS service.
384 static struct GNUNET_ATS_PerformanceHandle *ats;
387 * Task scheduled to refresh routes based on direct neighbours.
389 static GNUNET_SCHEDULER_TaskIdentifier rr_task;
392 * #GNUNET_YES if we are shutting down.
394 static int in_shutdown;
397 * Start creating a new DV set union by initiating the connection.
399 * @param cls the 'struct DirectNeighbor' of the peer we're building
400 * a routing consensus with
401 * @param tc scheduler context
404 initiate_set_union (void *cls,
405 const struct GNUNET_SCHEDULER_TaskContext *tc);
409 * Start creating a new DV set union construction, our neighbour has
410 * asked for it (callback for listening peer).
412 * @param cls the 'struct DirectNeighbor' of the peer we're building
413 * a routing consensus with
414 * @param other_peer the other peer
415 * @param context_msg message with application specific information from
417 * @param request request from the other peer, use GNUNET_SET_accept
418 * to accept it, otherwise the request will be refused
419 * Note that we don't use a return value here, as it is also
420 * necessary to specify the set we want to do the operation with,
421 * whith sometimes can be derived from the context message.
422 * Also necessary to specify the timeout.
425 listen_set_union (void *cls,
426 const struct GNUNET_PeerIdentity *other_peer,
427 const struct GNUNET_MessageHeader *context_msg,
428 struct GNUNET_SET_Request *request);
432 * Forward a message from another peer to the plugin.
434 * @param message the message to send to the plugin
435 * @param origin the original sender of the message
436 * @param distance distance to the original sender of the message
439 send_data_to_plugin (const struct GNUNET_MessageHeader *message,
440 const struct GNUNET_PeerIdentity *origin,
443 struct GNUNET_DV_ReceivedMessage *received_msg;
446 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
447 "Delivering message from peer `%s'\n",
448 GNUNET_i2s (origin));
449 size = sizeof (struct GNUNET_DV_ReceivedMessage) +
450 ntohs (message->size);
451 if (size >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
453 GNUNET_break (0); /* too big */
456 received_msg = GNUNET_malloc (size);
457 received_msg->header.size = htons (size);
458 received_msg->header.type = htons (GNUNET_MESSAGE_TYPE_DV_RECV);
459 received_msg->distance = htonl (distance);
460 received_msg->sender = *origin;
461 memcpy (&received_msg[1], message, ntohs (message->size));
462 GNUNET_SERVER_notification_context_broadcast (nc,
463 &received_msg->header,
465 GNUNET_free (received_msg);
470 * Forward a control message to the plugin.
472 * @param message the message to send to the plugin
475 send_control_to_plugin (const struct GNUNET_MessageHeader *message)
477 GNUNET_SERVER_notification_context_broadcast (nc,
484 * Give an (N)ACK message to the plugin, we transmitted a message for it.
486 * @param target peer that received the message
487 * @param uid plugin-chosen UID for the message
488 * @param nack #GNUNET_NO to send ACK, #GNUNET_YES to send NACK
491 send_ack_to_plugin (const struct GNUNET_PeerIdentity *target,
495 struct GNUNET_DV_AckMessage ack_msg;
497 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
498 "Delivering ACK for message to peer `%s'\n",
499 GNUNET_i2s (target));
500 ack_msg.header.size = htons (sizeof (ack_msg));
501 ack_msg.header.type = htons ((GNUNET_YES == nack)
502 ? GNUNET_MESSAGE_TYPE_DV_SEND_NACK
503 : GNUNET_MESSAGE_TYPE_DV_SEND_ACK);
504 ack_msg.uid = htonl (uid);
505 ack_msg.target = *target;
506 send_control_to_plugin (&ack_msg.header);
511 * Send a DISTANCE_CHANGED message to the plugin.
513 * @param peer peer with a changed distance
514 * @param distance new distance to the peer
515 * @param network network used by the neighbor
518 send_distance_change_to_plugin (const struct GNUNET_PeerIdentity *peer,
520 enum GNUNET_ATS_Network_Type network)
522 struct GNUNET_DV_DistanceUpdateMessage du_msg;
524 GNUNET_break (GNUNET_ATS_NET_UNSPECIFIED != network);
525 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
526 "Delivering DISTANCE_CHANGED for message about peer `%s'\n",
528 du_msg.header.size = htons (sizeof (du_msg));
529 du_msg.header.type = htons (GNUNET_MESSAGE_TYPE_DV_DISTANCE_CHANGED);
530 du_msg.distance = htonl (distance);
532 du_msg.network = htonl ((uint32_t) network);
533 send_control_to_plugin (&du_msg.header);
538 * Give a CONNECT message to the plugin.
540 * @param target peer that connected
541 * @param distance distance to the target
542 * @param network the network the next hop is located in
545 send_connect_to_plugin (const struct GNUNET_PeerIdentity *target,
547 enum GNUNET_ATS_Network_Type network)
549 struct GNUNET_DV_ConnectMessage cm;
551 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
552 "Delivering CONNECT about peer %s with distance %u\n",
553 GNUNET_i2s (target), distance);
554 cm.header.size = htons (sizeof (cm));
555 cm.header.type = htons (GNUNET_MESSAGE_TYPE_DV_CONNECT);
556 cm.distance = htonl (distance);
557 cm.network = htonl ((uint32_t) network);
559 send_control_to_plugin (&cm.header);
564 * Give a DISCONNECT message to the plugin.
566 * @param target peer that disconnected
569 send_disconnect_to_plugin (const struct GNUNET_PeerIdentity *target)
571 struct GNUNET_DV_DisconnectMessage dm;
573 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
574 "Delivering DISCONNECT about peer `%s'\n",
575 GNUNET_i2s (target));
576 dm.header.size = htons (sizeof (dm));
577 dm.header.type = htons (GNUNET_MESSAGE_TYPE_DV_DISCONNECT);
578 dm.reserved = htonl (0);
580 send_control_to_plugin (&dm.header);
585 * Function called to transfer a message to another peer
588 * @param cls closure with the direct neighbor
589 * @param size number of bytes available in buf
590 * @param buf where the callee should write the message
591 * @return number of bytes written to buf
594 core_transmit_notify (void *cls, size_t size, void *buf)
596 struct DirectNeighbor *dn = cls;
598 struct PendingMessage *pending;
605 /* client disconnected */
609 while ( (NULL != (pending = dn->pm_head)) &&
610 (size >= off + (msize = ntohs (pending->msg->size))))
613 GNUNET_CONTAINER_DLL_remove (dn->pm_head,
616 memcpy (&cbuf[off], pending->msg, msize);
617 if (0 != pending->uid)
619 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
620 "Acking transmission of %u bytes to %s with plugin\n",
622 GNUNET_i2s (&pending->next_target));
623 send_ack_to_plugin (&pending->next_target,
627 GNUNET_free (pending);
630 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
631 "Transmitting total of %u bytes to %s\n",
633 GNUNET_i2s (&dn->peer));
634 GNUNET_assert (NULL != core_api);
635 if (NULL != dn->pm_head)
637 GNUNET_CORE_notify_transmit_ready (core_api,
638 GNUNET_YES /* cork */,
640 GNUNET_TIME_UNIT_FOREVER_REL,
643 &core_transmit_notify, dn);
649 * Forward the given payload to the given target.
651 * @param target where to send the message
652 * @param distance expected (remaining) distance to the target
653 * @param uid unique ID for the message
654 * @param actual_target ultimate recipient for the message
655 * @param sender original sender of the message
656 * @param payload payload of the message
659 forward_payload (struct DirectNeighbor *target,
662 const struct GNUNET_PeerIdentity *sender,
663 const struct GNUNET_PeerIdentity *actual_target,
664 const struct GNUNET_MessageHeader *payload)
666 struct PendingMessage *pm;
667 struct RouteMessage *rm;
670 if ( (target->pm_queue_size >= MAX_QUEUE_SIZE) &&
672 (0 != memcmp (sender,
674 sizeof (struct GNUNET_PeerIdentity))) )
676 /* not _our_ client and queue is full, drop */
677 GNUNET_STATISTICS_update (stats,
678 "# messages dropped",
682 msize = sizeof (struct RouteMessage) + ntohs (payload->size);
683 if (msize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
688 pm = GNUNET_malloc (sizeof (struct PendingMessage) + msize);
689 pm->next_target = target->peer;
691 pm->msg = (const struct GNUNET_MessageHeader *) &pm[1];
692 rm = (struct RouteMessage *) &pm[1];
693 rm->header.size = htons ((uint16_t) msize);
694 rm->header.type = htons (GNUNET_MESSAGE_TYPE_DV_ROUTE);
695 rm->distance = htonl (distance);
696 rm->target = *actual_target;
697 rm->sender = *sender;
698 memcpy (&rm[1], payload, ntohs (payload->size));
699 GNUNET_CONTAINER_DLL_insert_tail (target->pm_head,
702 target->pm_queue_size++;
703 GNUNET_assert (NULL != core_api);
704 if (NULL == target->cth)
705 target->cth = GNUNET_CORE_notify_transmit_ready (core_api,
706 GNUNET_YES /* cork */,
708 GNUNET_TIME_UNIT_FOREVER_REL,
711 &core_transmit_notify, target);
716 * Find a free slot for storing a 'route' in the 'consensi'
717 * set at the given distance.
719 * @param distance distance to use for the set slot
722 get_consensus_slot (uint32_t distance)
724 struct ConsensusSet *cs;
727 GNUNET_assert (distance < DEFAULT_FISHEYE_DEPTH);
728 cs = &consensi[distance];
730 while ( (i < cs->array_length) &&
731 (NULL != cs->targets[i]) ) i++;
732 if (i == cs->array_length)
734 GNUNET_array_grow (cs->targets,
736 cs->array_length * 2 + 2);
743 * Allocate a slot in the consensus set for a route.
745 * @param route route to initialize
746 * @param distance which consensus set to use
749 allocate_route (struct Route *route,
754 if (distance >= DEFAULT_FISHEYE_DEPTH)
756 route->target.distance = htonl (distance);
757 route->set_offset = UINT_MAX; /* invalid slot */
760 i = get_consensus_slot (distance);
761 route->set_offset = i;
762 consensi[distance].targets[i] = route;
763 route->target.distance = htonl (distance);
768 * Release a slot in the consensus set for a route.
770 * @param route route to release the slot from
773 release_route (struct Route *route)
775 if (UINT_MAX == route->set_offset)
777 GNUNET_assert (ntohl (route->target.distance) < DEFAULT_FISHEYE_DEPTH);
778 consensi[ntohl (route->target.distance)].targets[route->set_offset] = NULL;
779 route->set_offset = UINT_MAX; /* indicate invalid slot */
784 * Move a route from one consensus set to another.
786 * @param route route to move
787 * @param new_distance new distance for the route (destination set)
790 move_route (struct Route *route,
791 uint32_t new_distance)
793 release_route (route);
794 allocate_route (route, new_distance);
799 * Initialize this neighbors 'my_set' and when done give
800 * it to the pending set operation for execution.
802 * Add a single element to the set per call:
804 * If we reached the last element of a consensus element: increase distance
807 * @param cls the neighbor for which we are building the set
810 build_set (void *cls)
812 struct DirectNeighbor *neighbor = cls;
813 struct GNUNET_SET_Element element;
814 struct Target *target;
818 /* skip over NULL entries */
819 while ( (DEFAULT_FISHEYE_DEPTH > neighbor->consensus_insertion_distance) &&
820 (consensi[neighbor->consensus_insertion_distance].array_length > neighbor->consensus_insertion_offset) &&
821 (NULL == consensi[neighbor->consensus_insertion_distance].targets[neighbor->consensus_insertion_offset]) )
822 neighbor->consensus_insertion_offset++;
823 while ( (DEFAULT_FISHEYE_DEPTH > neighbor->consensus_insertion_distance) &&
824 (consensi[neighbor->consensus_insertion_distance].array_length == neighbor->consensus_insertion_offset) )
826 /* If we reached the last element of a consensus array element: increase distance and start with next array */
827 neighbor->consensus_insertion_offset = 0;
828 neighbor->consensus_insertion_distance++;
829 /* skip over NULL entries */
830 while ( (DEFAULT_FISHEYE_DEPTH > neighbor->consensus_insertion_distance) &&
831 (consensi[neighbor->consensus_insertion_distance].array_length > neighbor->consensus_insertion_offset) &&
832 (NULL == consensi[neighbor->consensus_insertion_distance].targets[neighbor->consensus_insertion_offset]) )
833 neighbor->consensus_insertion_offset++;
835 if (DEFAULT_FISHEYE_DEPTH == neighbor->consensus_insertion_distance)
837 /* we have added all elements to the set, run the operation */
838 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
839 "Finished building my SET for peer `%s' with %u elements, committing\n",
840 GNUNET_i2s (&neighbor->peer),
841 neighbor->consensus_elements);
842 GNUNET_SET_commit (neighbor->set_op,
844 GNUNET_SET_destroy (neighbor->my_set);
845 neighbor->my_set = NULL;
849 route = consensi[neighbor->consensus_insertion_distance].targets[neighbor->consensus_insertion_offset];
850 GNUNET_assert (NULL != route);
851 target = &route->target;
852 GNUNET_assert (ntohl (target->distance) < DEFAULT_FISHEYE_DEPTH);
853 element.size = sizeof (struct Target);
854 element.type = htons (0); /* do we need this? */
855 element.data = target;
857 /* Find next non-NULL entry */
858 neighbor->consensus_insertion_offset++;
859 if ( (0 != memcmp (&target->peer, &my_identity, sizeof (my_identity))) &&
860 (0 != memcmp (&target->peer, &neighbor->peer, sizeof (neighbor->peer))) )
862 /* Add target if it is not the neighbor or this peer */
863 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
864 "Adding peer `%s' with distance %u to SET\n",
865 GNUNET_i2s (&target->peer),
866 ntohl (target->distance));
867 GNUNET_SET_add_element (neighbor->my_set,
869 &build_set, neighbor);
870 neighbor->consensus_elements++;
873 build_set (neighbor);
878 * A peer is now connected to us at distance 1. Initiate DV exchange.
880 * @param neighbor entry for the neighbor at distance 1
883 handle_direct_connect (struct DirectNeighbor *neighbor)
886 struct GNUNET_HashCode h1;
887 struct GNUNET_HashCode h2;
888 struct GNUNET_HashCode session_id;
890 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
891 "Direct connection to %s established, routing table exchange begins.\n",
892 GNUNET_i2s (&neighbor->peer));
893 GNUNET_STATISTICS_update (stats,
894 "# peers connected (1-hop)",
896 route = GNUNET_CONTAINER_multipeermap_get (all_routes,
900 GNUNET_assert (GNUNET_YES ==
901 GNUNET_CONTAINER_multipeermap_remove (all_routes,
904 send_disconnect_to_plugin (&neighbor->peer);
905 release_route (route);
909 neighbor->direct_route = GNUNET_new (struct Route);
910 neighbor->direct_route->next_hop = neighbor;
911 neighbor->direct_route->target.peer = neighbor->peer;
912 allocate_route (neighbor->direct_route, DIRECT_NEIGHBOR_COST);
914 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
915 "Adding direct route to %s\n",
916 GNUNET_i2s (&neighbor->direct_route->target.peer));
919 /* construct session ID seed as XOR of both peer's identities */
920 GNUNET_CRYPTO_hash (&my_identity, sizeof (my_identity), &h1);
921 GNUNET_CRYPTO_hash (&neighbor->peer, sizeof (struct GNUNET_PeerIdentity), &h2);
922 GNUNET_CRYPTO_hash_xor (&h1,
925 /* make sure session ID is unique across applications by salting it with 'DV' */
926 GNUNET_CRYPTO_hkdf (&neighbor->real_session_id, sizeof (struct GNUNET_HashCode),
927 GCRY_MD_SHA512, GCRY_MD_SHA256,
929 &session_id, sizeof (session_id),
931 if (0 < memcmp (&neighbor->peer,
933 sizeof (struct GNUNET_PeerIdentity)))
935 if (NULL != neighbor->listen_handle)
940 neighbor->initiate_task = GNUNET_SCHEDULER_add_now (&initiate_set_union,
945 if (NULL != neighbor->listen_handle)
951 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
952 "Starting SET listen operation with peer `%s'\n",
953 GNUNET_i2s(&neighbor->peer));
954 neighbor->listen_handle = GNUNET_SET_listen (cfg,
955 GNUNET_SET_OPERATION_UNION,
956 &neighbor->real_session_id,
965 * Method called whenever a peer connects.
968 * @param peer peer identity this notification is about
971 handle_core_connect (void *cls,
972 const struct GNUNET_PeerIdentity *peer)
974 struct DirectNeighbor *neighbor;
976 /* Check for connect to self message */
977 if (0 == memcmp (&my_identity, peer, sizeof (struct GNUNET_PeerIdentity)))
979 /* check if entry exists */
980 neighbor = GNUNET_CONTAINER_multipeermap_get (direct_neighbors,
982 if (NULL != neighbor)
984 GNUNET_break (GNUNET_ATS_NET_UNSPECIFIED != neighbor->network);
985 GNUNET_break (GNUNET_YES != neighbor->connected);
986 neighbor->connected = GNUNET_YES;
987 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
988 "Core connected to %s (distance %u)\n",
990 (unsigned int) neighbor->distance);
991 if (DIRECT_NEIGHBOR_COST != neighbor->distance)
993 handle_direct_connect (neighbor);
996 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
997 "Core connected to %s (distance unknown)\n",
999 neighbor = GNUNET_new (struct DirectNeighbor);
1000 neighbor->peer = *peer;
1001 GNUNET_assert (GNUNET_YES ==
1002 GNUNET_CONTAINER_multipeermap_put (direct_neighbors,
1005 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
1006 neighbor->connected = GNUNET_YES;
1007 neighbor->distance = 0; /* unknown */
1008 neighbor->network = GNUNET_ATS_NET_UNSPECIFIED;
1013 * Called for each 'target' in a neighbor table to free the associated memory.
1016 * @param key key of the value
1017 * @param value value to free
1018 * @return #GNUNET_OK to continue to iterate
1021 free_targets (void *cls,
1022 const struct GNUNET_PeerIdentity *key,
1025 GNUNET_free (value);
1031 * Multipeerhmap iterator for checking if a given route is
1032 * (now) useful to this peer.
1034 * @param cls the direct neighbor for the given route
1035 * @param key key value stored under
1036 * @param value a 'struct Target' that may or may not be useful; not that
1037 * the distance in 'target' does not include the first hop yet
1038 * @return #GNUNET_YES to continue iteration, #GNUNET_NO to stop
1041 check_possible_route (void *cls,
1042 const struct GNUNET_PeerIdentity *key,
1045 struct DirectNeighbor *neighbor = cls;
1046 struct Target *target = value;
1047 struct Route *route;
1050 GNUNET_CONTAINER_multipeermap_contains (direct_neighbors,
1052 return GNUNET_YES; /* direct route, do not care about alternatives */
1053 route = GNUNET_CONTAINER_multipeermap_get (all_routes,
1057 /* we have an existing route, check how it compares with going via 'target' */
1058 if (ntohl (route->target.distance) > ntohl (target->distance) + 1)
1060 /* via 'target' is cheaper than the existing route; switch to alternative route! */
1061 move_route (route, ntohl (target->distance) + 1);
1062 route->next_hop = neighbor;
1063 send_distance_change_to_plugin (&target->peer,
1064 ntohl (target->distance) + 1,
1067 return GNUNET_YES; /* got a route to this target already */
1069 if (ntohl (target->distance) >= DEFAULT_FISHEYE_DEPTH)
1070 return GNUNET_YES; /* distance is too large to be interesting */
1071 route = GNUNET_new (struct Route);
1072 route->next_hop = neighbor;
1073 route->target.peer = target->peer;
1074 allocate_route (route, ntohl (target->distance) + 1);
1075 GNUNET_assert (GNUNET_YES ==
1076 GNUNET_CONTAINER_multipeermap_put (all_routes,
1077 &route->target.peer,
1079 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
1080 send_connect_to_plugin (&route->target.peer,
1081 ntohl (route->target.distance),
1088 * Multipeermap iterator for finding routes that were previously
1089 * "hidden" due to a better route (called after a disconnect event).
1092 * @param key peer identity of the given direct neighbor
1093 * @param value a `struct DirectNeighbor` to check for additional routes
1094 * @return #GNUNET_YES to continue iteration
1097 refresh_routes (void *cls,
1098 const struct GNUNET_PeerIdentity *key,
1101 struct DirectNeighbor *neighbor = value;
1103 if ( (GNUNET_YES != neighbor->connected) ||
1104 (DIRECT_NEIGHBOR_COST != neighbor->distance) )
1106 if (NULL != neighbor->neighbor_table)
1107 GNUNET_CONTAINER_multipeermap_iterate (neighbor->neighbor_table,
1108 &check_possible_route,
1115 * Task to run #refresh_routes() on all direct neighbours.
1121 refresh_routes_task (void *cls,
1122 const struct GNUNET_SCHEDULER_TaskContext *tc)
1124 rr_task = GNUNET_SCHEDULER_NO_TASK;
1125 GNUNET_CONTAINER_multipeermap_iterate (direct_neighbors,
1132 * Asynchronously run #refresh_routes() at the next opportunity
1133 * on all direct neighbours.
1136 schedule_refresh_routes ()
1138 if (GNUNET_SCHEDULER_NO_TASK == rr_task)
1139 rr_task = GNUNET_SCHEDULER_add_now (&refresh_routes_task,
1145 * Get distance information from 'atsi'.
1147 * @param atsi performance data
1148 * @param atsi_count number of entries in atsi
1149 * @return connected transport distance
1152 get_atsi_distance (const struct GNUNET_ATS_Information *atsi,
1153 uint32_t atsi_count)
1157 for (i = 0; i < atsi_count; i++)
1158 if (ntohl (atsi[i].type) == GNUNET_ATS_QUALITY_NET_DISTANCE)
1159 return (0 == ntohl (atsi[i].value)) ? DIRECT_NEIGHBOR_COST : ntohl (atsi[i].value); // FIXME: 0 check should not be required once ATS is fixed!
1160 /* If we do not have explicit distance data, assume direct neighbor. */
1161 return DIRECT_NEIGHBOR_COST;
1166 * Get network information from 'atsi'.
1168 * @param atsi performance data
1169 * @param atsi_count number of entries in atsi
1170 * @return connected transport network
1172 static enum GNUNET_ATS_Network_Type
1173 get_atsi_network (const struct GNUNET_ATS_Information *atsi,
1174 uint32_t atsi_count)
1178 for (i = 0; i < atsi_count; i++)
1179 if (ntohl (atsi[i].type) == GNUNET_ATS_NETWORK_TYPE)
1180 return (enum GNUNET_ATS_Network_Type) ntohl (atsi[i].value);
1181 return GNUNET_ATS_NET_UNSPECIFIED;
1185 * Multipeermap iterator for freeing routes that go via a particular
1186 * neighbor that disconnected and is thus no longer available.
1188 * @param cls the direct neighbor that is now unavailable
1189 * @param key key value stored under
1190 * @param value a `struct Route` that may or may not go via neighbor
1192 * @return #GNUNET_YES to continue iteration, #GNUNET_NO to stop
1195 cull_routes (void *cls,
1196 const struct GNUNET_PeerIdentity *key,
1199 struct DirectNeighbor *neighbor = cls;
1200 struct Route *route = value;
1202 if (route->next_hop != neighbor)
1203 return GNUNET_YES; /* not affected */
1204 GNUNET_assert (GNUNET_YES ==
1205 GNUNET_CONTAINER_multipeermap_remove (all_routes, key, value));
1206 release_route (route);
1207 send_disconnect_to_plugin (&route->target.peer);
1208 GNUNET_free (route);
1214 * Handle the case that a direct connection to a peer is
1215 * disrupted. Remove all routes via that peer and
1216 * stop the consensus with it.
1218 * @param neighbor peer that was disconnected (or at least is no
1219 * longer at distance 1)
1222 handle_direct_disconnect (struct DirectNeighbor *neighbor)
1224 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1225 "Culling routes via %s due to direct disconnect\n",
1226 GNUNET_i2s (&neighbor->peer));
1227 GNUNET_CONTAINER_multipeermap_iterate (all_routes,
1230 if (NULL != neighbor->cth)
1232 GNUNET_CORE_notify_transmit_ready_cancel (neighbor->cth);
1233 neighbor->cth = NULL;
1236 if (NULL != neighbor->direct_route)
1238 release_route (neighbor->direct_route);
1239 GNUNET_free (neighbor->direct_route);
1240 neighbor->direct_route = NULL;
1243 if (NULL != neighbor->neighbor_table_consensus)
1245 GNUNET_CONTAINER_multipeermap_iterate (neighbor->neighbor_table_consensus,
1248 GNUNET_CONTAINER_multipeermap_destroy (neighbor->neighbor_table_consensus);
1249 neighbor->neighbor_table_consensus = NULL;
1251 if (NULL != neighbor->neighbor_table)
1253 GNUNET_CONTAINER_multipeermap_iterate (neighbor->neighbor_table,
1256 GNUNET_CONTAINER_multipeermap_destroy (neighbor->neighbor_table);
1257 neighbor->neighbor_table = NULL;
1259 if (NULL != neighbor->set_op)
1261 GNUNET_SET_operation_cancel (neighbor->set_op);
1262 neighbor->set_op = NULL;
1264 if (NULL != neighbor->my_set)
1266 GNUNET_SET_destroy (neighbor->my_set);
1267 neighbor->my_set = NULL;
1269 if (NULL != neighbor->listen_handle)
1271 GNUNET_SET_listen_cancel (neighbor->listen_handle);
1272 neighbor->listen_handle = NULL;
1274 if (GNUNET_SCHEDULER_NO_TASK != neighbor->initiate_task)
1276 GNUNET_SCHEDULER_cancel (neighbor->initiate_task);
1277 neighbor->initiate_task = GNUNET_SCHEDULER_NO_TASK;
1283 * Function that is called with QoS information about an address; used
1284 * to update our current distance to another peer.
1286 * @param cls closure
1287 * @param address the address
1288 * @param active is this address in active use
1289 * @param bandwidth_out assigned outbound bandwidth for the connection
1290 * @param bandwidth_in assigned inbound bandwidth for the connection
1291 * @param ats performance data for the address (as far as known)
1292 * @param ats_count number of performance records in @a ats
1295 handle_ats_update (void *cls,
1296 const struct GNUNET_HELLO_Address *address,
1298 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out,
1299 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in,
1300 const struct GNUNET_ATS_Information *ats,
1303 struct DirectNeighbor *neighbor;
1305 enum GNUNET_ATS_Network_Type network = GNUNET_ATS_NET_UNSPECIFIED;
1307 if (GNUNET_NO == active)
1309 distance = get_atsi_distance (ats, ats_count);
1310 network = get_atsi_network (ats, ats_count);
1311 GNUNET_break (GNUNET_ATS_NET_UNSPECIFIED != network);
1312 /* check if entry exists */
1313 neighbor = GNUNET_CONTAINER_multipeermap_get (direct_neighbors,
1315 if (NULL != neighbor)
1317 neighbor->network = network;
1318 if (neighbor->distance == distance)
1319 return; /* nothing new to see here, move along */
1320 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1321 "ATS says distance to %s is now %u\n",
1322 GNUNET_i2s (&address->peer),
1323 (unsigned int) distance);
1324 if ( (DIRECT_NEIGHBOR_COST == neighbor->distance) &&
1325 (DIRECT_NEIGHBOR_COST == distance) )
1326 return; /* no change */
1327 if (DIRECT_NEIGHBOR_COST == neighbor->distance)
1329 neighbor->distance = distance;
1330 GNUNET_STATISTICS_update (stats,
1331 "# peers connected (1-hop)",
1333 handle_direct_disconnect (neighbor);
1334 schedule_refresh_routes ();
1337 neighbor->distance = distance;
1338 if (DIRECT_NEIGHBOR_COST != neighbor->distance)
1340 if (GNUNET_YES != neighbor->connected)
1342 handle_direct_connect (neighbor);
1345 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1346 "ATS says distance to %s is now %u\n",
1347 GNUNET_i2s (&address->peer),
1348 (unsigned int) distance);
1349 neighbor = GNUNET_new (struct DirectNeighbor);
1350 neighbor->peer = address->peer;
1351 GNUNET_assert (GNUNET_YES ==
1352 GNUNET_CONTAINER_multipeermap_put (direct_neighbors,
1355 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
1356 neighbor->connected = GNUNET_NO; /* not yet */
1357 neighbor->distance = distance;
1358 neighbor->network = network;
1363 * Check if a target was removed from the set of the other peer; if so,
1364 * if we also used it for our route, we need to remove it from our
1365 * 'all_routes' set (and later check if an alternative path now exists).
1367 * @param cls the `struct DirectNeighbor`
1368 * @param key peer identity for the target
1369 * @param value a `struct Target` previously reachable via the given neighbor
1372 check_target_removed (void *cls,
1373 const struct GNUNET_PeerIdentity *key,
1376 struct DirectNeighbor *neighbor = cls;
1377 struct Target *new_target;
1378 struct Route *current_route;
1380 new_target = GNUNET_CONTAINER_multipeermap_get (neighbor->neighbor_table_consensus,
1382 current_route = GNUNET_CONTAINER_multipeermap_get (all_routes,
1384 if (NULL != new_target)
1386 /* target was in old set, is in new set */
1387 if ( (NULL != current_route) &&
1388 (current_route->next_hop == neighbor) &&
1389 (current_route->target.distance != new_target->distance) )
1391 /* need to recalculate routes due to distance change */
1392 neighbor->target_removed = GNUNET_YES;
1396 /* target was revoked, check if it was used */
1397 if ( (NULL == current_route) ||
1398 (current_route->next_hop != neighbor) )
1400 /* didn't matter, wasn't used */
1403 /* remove existing route */
1404 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1405 "Lost route to %s\n",
1406 GNUNET_i2s (¤t_route->target.peer));
1407 GNUNET_assert (GNUNET_YES ==
1408 GNUNET_CONTAINER_multipeermap_remove (all_routes, key, current_route));
1409 send_disconnect_to_plugin (¤t_route->target.peer);
1410 release_route (current_route);
1411 GNUNET_free (current_route);
1412 neighbor->target_removed = GNUNET_YES;
1418 * Check if a target was added to the set of the other peer; if it
1419 * was added or impoves the existing route, do the needed updates.
1421 * @param cls the `struct DirectNeighbor`
1422 * @param key peer identity for the target
1423 * @param value a `struct Target` now reachable via the given neighbor
1426 check_target_added (void *cls,
1427 const struct GNUNET_PeerIdentity *key,
1430 struct DirectNeighbor *neighbor = cls;
1431 struct Target *target = value;
1432 struct Route *current_route;
1434 /* target was revoked, check if it was used */
1435 current_route = GNUNET_CONTAINER_multipeermap_get (all_routes,
1437 if (NULL != current_route)
1440 if (current_route->next_hop == neighbor)
1442 /* we had the same route before, no change in target */
1443 if (ntohl (target->distance) + 1 != ntohl (current_route->target.distance))
1445 /* but distance changed! */
1446 if (ntohl (target->distance) + 1 > DEFAULT_FISHEYE_DEPTH)
1448 /* distance increased beyond what is allowed, kill route */
1449 GNUNET_assert (GNUNET_YES ==
1450 GNUNET_CONTAINER_multipeermap_remove (all_routes,
1453 send_disconnect_to_plugin (key);
1454 release_route (current_route);
1455 GNUNET_free (current_route);
1459 /* distance decreased, update route */
1460 move_route (current_route,
1461 ntohl (target->distance) + 1);
1462 send_distance_change_to_plugin (&target->peer,
1463 ntohl (target->distance) + 1,
1469 if (ntohl (current_route->target.distance) <= ntohl (target->distance) + 1)
1471 /* alternative, shorter route exists, ignore */
1474 /* new route is better than the existing one, take over! */
1475 /* NOTE: minor security issue: malicious peers may advertise
1476 very short routes to take over longer paths; as we don't
1477 check that the shorter routes actually work, a malicious
1478 direct neighbor can use this to DoS our long routes */
1480 move_route (current_route, ntohl (target->distance) + 1);
1481 current_route->next_hop = neighbor;
1482 send_distance_change_to_plugin (&target->peer,
1483 ntohl (target->distance) + 1,
1488 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1489 "Discovered new route to %s using %u hops\n",
1490 GNUNET_i2s (&target->peer),
1491 (unsigned int) (ntohl (target->distance) + 1));
1492 current_route = GNUNET_new (struct Route);
1493 current_route->next_hop = neighbor;
1494 current_route->target.peer = target->peer;
1495 allocate_route (current_route, ntohl (target->distance) + 1);
1496 GNUNET_assert (GNUNET_YES ==
1497 GNUNET_CONTAINER_multipeermap_put (all_routes,
1498 ¤t_route->target.peer,
1500 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
1502 send_connect_to_plugin (¤t_route->target.peer,
1503 ntohl (current_route->target.distance),
1510 * Callback for set operation results. Called for each element
1511 * in the result set.
1512 * We have learned a new route from the other peer. Add it to the
1513 * route set we're building.
1515 * @param cls the `struct DirectNeighbor` we're building the consensus with
1516 * @param element a result element, only valid if status is #GNUNET_SET_STATUS_OK
1517 * @param status see `enum GNUNET_SET_Status`
1520 handle_set_union_result (void *cls,
1521 const struct GNUNET_SET_Element *element,
1522 enum GNUNET_SET_Status status)
1524 struct DirectNeighbor *neighbor = cls;
1525 struct Target *target;
1529 case GNUNET_SET_STATUS_OK:
1530 status_str = "GNUNET_SET_STATUS_OK";
1532 case GNUNET_SET_STATUS_TIMEOUT:
1533 status_str = "GNUNET_SET_STATUS_TIMEOUT";
1535 case GNUNET_SET_STATUS_FAILURE:
1536 status_str = "GNUNET_SET_STATUS_FAILURE";
1538 case GNUNET_SET_STATUS_HALF_DONE:
1539 status_str = "GNUNET_SET_STATUS_HALF_DONE";
1541 case GNUNET_SET_STATUS_DONE:
1542 status_str = "GNUNET_SET_STATUS_DONE";
1545 status_str = "UNDEFINED";
1549 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1550 "Got SET union result: %s\n",
1554 case GNUNET_SET_STATUS_OK:
1555 if (sizeof (struct Target) != element->size)
1557 GNUNET_break_op (0);
1561 GNUNET_CONTAINER_multipeermap_contains (direct_neighbors,
1562 &((struct Target *) element->data)->peer))
1564 /* this is a direct neighbor of ours, we do not care about routes
1568 target = GNUNET_new (struct Target);
1569 memcpy (target, element->data, sizeof (struct Target));
1570 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1571 "Received information about peer `%s' with distance %u from SET\n",
1572 GNUNET_i2s (&target->peer),
1573 ntohl (target->distance) + 1);
1575 if (NULL == neighbor->neighbor_table_consensus)
1576 neighbor->neighbor_table_consensus
1577 = GNUNET_CONTAINER_multipeermap_create (10, GNUNET_NO);
1579 GNUNET_CONTAINER_multipeermap_put (neighbor->neighbor_table_consensus,
1582 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
1584 GNUNET_break_op (0);
1585 GNUNET_free (target);
1588 case GNUNET_SET_STATUS_TIMEOUT:
1589 case GNUNET_SET_STATUS_FAILURE:
1590 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1591 "Failed to establish DV union, will try again later\n");
1592 neighbor->set_op = NULL;
1593 if (NULL != neighbor->neighbor_table_consensus)
1595 GNUNET_CONTAINER_multipeermap_iterate (neighbor->neighbor_table_consensus,
1598 GNUNET_CONTAINER_multipeermap_destroy (neighbor->neighbor_table_consensus);
1599 neighbor->neighbor_table_consensus = NULL;
1601 if (0 < memcmp (&neighbor->peer,
1603 sizeof (struct GNUNET_PeerIdentity)))
1604 neighbor->initiate_task = GNUNET_SCHEDULER_add_delayed (GNUNET_DV_CONSENSUS_FREQUENCY,
1605 &initiate_set_union,
1608 case GNUNET_SET_STATUS_HALF_DONE:
1610 case GNUNET_SET_STATUS_DONE:
1611 /* we got all of our updates; integrate routing table! */
1612 neighbor->target_removed = GNUNET_NO;
1613 if (NULL == neighbor->neighbor_table_consensus)
1614 neighbor->neighbor_table_consensus = GNUNET_CONTAINER_multipeermap_create (10, GNUNET_NO);
1615 if (NULL != neighbor->neighbor_table)
1616 GNUNET_CONTAINER_multipeermap_iterate (neighbor->neighbor_table,
1617 &check_target_removed,
1619 if (GNUNET_YES == neighbor->target_removed)
1621 /* check if we got an alternative for the removed routes */
1622 schedule_refresh_routes ();
1624 /* add targets that appeared (and check for improved routes) */
1625 GNUNET_CONTAINER_multipeermap_iterate (neighbor->neighbor_table_consensus,
1626 &check_target_added,
1628 if (NULL != neighbor->neighbor_table)
1630 GNUNET_CONTAINER_multipeermap_iterate (neighbor->neighbor_table,
1633 GNUNET_CONTAINER_multipeermap_destroy (neighbor->neighbor_table);
1634 neighbor->neighbor_table = NULL;
1636 neighbor->neighbor_table = neighbor->neighbor_table_consensus;
1637 neighbor->neighbor_table_consensus = NULL;
1639 /* operation done, schedule next run! */
1640 neighbor->set_op = NULL;
1641 if (0 < memcmp (&neighbor->peer,
1643 sizeof (struct GNUNET_PeerIdentity)))
1644 neighbor->initiate_task = GNUNET_SCHEDULER_add_delayed (GNUNET_DV_CONSENSUS_FREQUENCY,
1645 &initiate_set_union,
1656 * Start creating a new DV set union construction, our neighbour has
1657 * asked for it (callback for listening peer).
1659 * @param cls the 'struct DirectNeighbor' of the peer we're building
1660 * a routing consensus with
1661 * @param other_peer the other peer
1662 * @param context_msg message with application specific information from
1664 * @param request request from the other peer, use GNUNET_SET_accept
1665 * to accept it, otherwise the request will be refused
1666 * Note that we don't use a return value here, as it is also
1667 * necessary to specify the set we want to do the operation with,
1668 * whith sometimes can be derived from the context message.
1669 * Also necessary to specify the timeout.
1672 listen_set_union (void *cls,
1673 const struct GNUNET_PeerIdentity *other_peer,
1674 const struct GNUNET_MessageHeader *context_msg,
1675 struct GNUNET_SET_Request *request)
1677 struct DirectNeighbor *neighbor = cls;
1679 if (NULL == request)
1680 return; /* why??? */
1681 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1682 "Starting to create consensus with %s\n",
1683 GNUNET_i2s (&neighbor->peer));
1684 if (NULL != neighbor->set_op)
1686 GNUNET_SET_operation_cancel (neighbor->set_op);
1687 neighbor->set_op = NULL;
1689 if (NULL != neighbor->my_set)
1691 GNUNET_SET_destroy (neighbor->my_set);
1692 neighbor->my_set = NULL;
1694 neighbor->my_set = GNUNET_SET_create (cfg,
1695 GNUNET_SET_OPERATION_UNION);
1696 neighbor->set_op = GNUNET_SET_accept (request,
1697 GNUNET_SET_RESULT_ADDED,
1698 &handle_set_union_result,
1700 neighbor->consensus_insertion_offset = 0;
1701 neighbor->consensus_insertion_distance = 0;
1702 neighbor->consensus_elements = 0;
1703 build_set (neighbor);
1708 * Start creating a new DV set union by initiating the connection.
1710 * @param cls the `struct DirectNeighbor *` of the peer we're building
1711 * a routing consensus with
1712 * @param tc scheduler context
1715 initiate_set_union (void *cls,
1716 const struct GNUNET_SCHEDULER_TaskContext *tc)
1718 static uint16_t salt;
1719 struct DirectNeighbor *neighbor = cls;
1721 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1722 "Initiating SET union with peer `%s'\n",
1723 GNUNET_i2s (&neighbor->peer));
1724 neighbor->initiate_task = GNUNET_SCHEDULER_NO_TASK;
1725 neighbor->my_set = GNUNET_SET_create (cfg,
1726 GNUNET_SET_OPERATION_UNION);
1727 neighbor->set_op = GNUNET_SET_prepare (&neighbor->peer,
1728 &neighbor->real_session_id,
1731 GNUNET_SET_RESULT_ADDED,
1732 &handle_set_union_result,
1734 neighbor->consensus_insertion_offset = 0;
1735 neighbor->consensus_insertion_distance = 0;
1736 neighbor->consensus_elements = 0;
1737 build_set (neighbor);
1742 * Core handler for DV data messages. Whatever this message
1743 * contains all we really have to do is rip it out of its
1744 * DV layering and give it to our pal the DV plugin to report
1747 * @param cls closure
1748 * @param peer peer which sent the message (immediate sender)
1749 * @param message the message
1750 * @return #GNUNET_OK on success, #GNUNET_SYSERR if the other peer violated the protocol
1753 handle_dv_route_message (void *cls, const struct GNUNET_PeerIdentity *peer,
1754 const struct GNUNET_MessageHeader *message)
1756 const struct RouteMessage *rm;
1757 const struct GNUNET_MessageHeader *payload;
1758 struct Route *route;
1759 struct DirectNeighbor *neighbor;
1762 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1763 "Handling DV message from %s\n",
1765 if (ntohs (message->size) < sizeof (struct RouteMessage) + sizeof (struct GNUNET_MessageHeader))
1767 GNUNET_break_op (0);
1768 return GNUNET_SYSERR;
1770 rm = (const struct RouteMessage *) message;
1771 payload = (const struct GNUNET_MessageHeader *) &rm[1];
1772 if (ntohs (message->size) != sizeof (struct RouteMessage) + ntohs (payload->size))
1774 GNUNET_break_op (0);
1775 return GNUNET_SYSERR;
1777 if (0 == memcmp (&rm->target,
1779 sizeof (struct GNUNET_PeerIdentity)))
1781 /* message is for me, check reverse route! */
1782 route = GNUNET_CONTAINER_multipeermap_get (all_routes,
1786 /* don't have reverse route, drop */
1787 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1788 "No reverse route to %s, dropping %u bytes!\n",
1789 GNUNET_i2s (&rm->sender),
1790 ntohs (payload->size));
1791 GNUNET_STATISTICS_update (stats,
1792 "# message discarded (no reverse route)",
1796 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1797 "Delivering %u bytes to myself!\n",
1798 ntohs (payload->size));
1799 send_data_to_plugin (payload,
1801 ntohl (route->target.distance));
1804 route = GNUNET_CONTAINER_multipeermap_get (all_routes,
1808 neighbor = GNUNET_CONTAINER_multipeermap_get (direct_neighbors,
1810 if (NULL == neighbor)
1812 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1813 "No route to %s, not routing %u bytes!\n",
1814 GNUNET_i2s (&rm->target),
1815 ntohs (payload->size));
1816 GNUNET_STATISTICS_update (stats,
1817 "# messages discarded (no route)",
1821 distance = DIRECT_NEIGHBOR_COST;
1825 if (ntohl (route->target.distance) > ntohl (rm->distance) + 1)
1827 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1828 "Distance too far, not routing %u bytes!\n",
1829 ntohs (payload->size));
1830 GNUNET_STATISTICS_update (stats,
1831 "# messages discarded (target too far)",
1835 neighbor = route->next_hop;
1836 distance = ntohl (route->target.distance);
1838 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1839 "Forwarding message to %s\n",
1840 GNUNET_i2s (&rm->target));
1841 forward_payload (neighbor,
1852 * Service server's handler for message send requests (which come
1853 * bubbling up to us through the DV plugin).
1855 * @param cls closure
1856 * @param client identification of the client
1857 * @param message the actual message
1860 handle_dv_send_message (void *cls, struct GNUNET_SERVER_Client *client,
1861 const struct GNUNET_MessageHeader *message)
1863 struct Route *route;
1864 const struct GNUNET_DV_SendMessage *msg;
1865 const struct GNUNET_MessageHeader *payload;
1867 if (ntohs (message->size) < sizeof (struct GNUNET_DV_SendMessage) + sizeof (struct GNUNET_MessageHeader))
1870 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1873 msg = (const struct GNUNET_DV_SendMessage *) message;
1874 GNUNET_break (0 != ntohl (msg->uid));
1875 payload = (const struct GNUNET_MessageHeader *) &msg[1];
1876 if (ntohs (message->size) != sizeof (struct GNUNET_DV_SendMessage) + ntohs (payload->size))
1879 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1882 route = GNUNET_CONTAINER_multipeermap_get (all_routes,
1886 /* got disconnected */
1887 GNUNET_STATISTICS_update (stats,
1888 "# local messages discarded (no route)",
1890 send_ack_to_plugin (&msg->target, ntohl (msg->uid), GNUNET_YES);
1891 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1894 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1895 "Forwarding %u bytes to %s\n",
1896 ntohs (payload->size),
1897 GNUNET_i2s (&msg->target));
1899 forward_payload (route->next_hop,
1900 ntohl (route->target.distance),
1905 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1910 * Cleanup all of the data structures associated with a given neighbor.
1912 * @param neighbor neighbor to clean up
1915 cleanup_neighbor (struct DirectNeighbor *neighbor)
1917 struct PendingMessage *pending;
1919 while (NULL != (pending = neighbor->pm_head))
1921 neighbor->pm_queue_size--;
1922 GNUNET_CONTAINER_DLL_remove (neighbor->pm_head,
1925 GNUNET_free (pending);
1927 handle_direct_disconnect (neighbor);
1928 GNUNET_assert (GNUNET_YES ==
1929 GNUNET_CONTAINER_multipeermap_remove (direct_neighbors,
1932 GNUNET_free (neighbor);
1937 * Method called whenever a given peer disconnects.
1939 * @param cls closure
1940 * @param peer peer identity this notification is about
1943 handle_core_disconnect (void *cls, const struct GNUNET_PeerIdentity *peer)
1945 struct DirectNeighbor *neighbor;
1947 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1948 "Received core peer disconnect message for peer `%s'!\n",
1950 /* Check for disconnect from self message */
1951 if (0 == memcmp (&my_identity, peer, sizeof (struct GNUNET_PeerIdentity)))
1954 GNUNET_CONTAINER_multipeermap_get (direct_neighbors, peer);
1955 if (NULL == neighbor)
1960 GNUNET_break (GNUNET_YES == neighbor->connected);
1961 neighbor->connected = GNUNET_NO;
1962 if (DIRECT_NEIGHBOR_COST == neighbor->distance)
1965 GNUNET_STATISTICS_update (stats,
1966 "# peers connected (1-hop)",
1969 cleanup_neighbor (neighbor);
1971 if (GNUNET_YES == in_shutdown)
1973 schedule_refresh_routes ();
1978 * Multipeermap iterator for freeing routes. Should never be called.
1981 * @param key key value stored under
1982 * @param value the route to be freed
1983 * @return #GNUNET_YES to continue iteration, #GNUNET_NO to stop
1986 free_route (void *cls,
1987 const struct GNUNET_PeerIdentity *key,
1990 struct Route *route = value;
1993 GNUNET_assert (GNUNET_YES ==
1994 GNUNET_CONTAINER_multipeermap_remove (all_routes, key, value));
1995 release_route (route);
1996 send_disconnect_to_plugin (&route->target.peer);
1997 GNUNET_free (route);
2003 * Multipeermap iterator for freeing direct neighbors. Should never be called.
2006 * @param key key value stored under
2007 * @param value the direct neighbor to be freed
2008 * @return #GNUNET_YES to continue iteration, #GNUNET_NO to stop
2011 free_direct_neighbors (void *cls,
2012 const struct GNUNET_PeerIdentity *key,
2015 struct DirectNeighbor *neighbor = value;
2017 cleanup_neighbor (neighbor);
2023 * Task run during shutdown.
2029 shutdown_task (void *cls,
2030 const struct GNUNET_SCHEDULER_TaskContext *tc)
2034 in_shutdown = GNUNET_YES;
2035 GNUNET_assert (NULL != core_api);
2036 GNUNET_CORE_disconnect (core_api);
2038 GNUNET_ATS_performance_done (ats);
2040 GNUNET_CONTAINER_multipeermap_iterate (direct_neighbors,
2041 &free_direct_neighbors, NULL);
2042 GNUNET_CONTAINER_multipeermap_iterate (all_routes,
2044 GNUNET_CONTAINER_multipeermap_destroy (direct_neighbors);
2045 GNUNET_CONTAINER_multipeermap_destroy (all_routes);
2046 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
2048 GNUNET_SERVER_notification_context_destroy (nc);
2050 for (i=0;i<DEFAULT_FISHEYE_DEPTH;i++)
2052 GNUNET_array_grow (consensi[i].targets,
2053 consensi[i].array_length,
2056 if (GNUNET_SCHEDULER_NO_TASK != rr_task)
2058 GNUNET_SCHEDULER_cancel (rr_task);
2059 rr_task = GNUNET_SCHEDULER_NO_TASK;
2065 * Notify newly connected client about an existing route.
2067 * @param cls the `struct GNUNET_SERVER_Client *`
2068 * @param key peer identity
2069 * @param value the `struct Route *`
2070 * @return #GNUNET_OK (continue to iterate)
2073 add_route (void *cls,
2074 const struct GNUNET_PeerIdentity *key,
2077 struct GNUNET_SERVER_Client *client = cls;
2078 struct Route *route = value;
2079 struct GNUNET_DV_ConnectMessage cm;
2081 memset (&cm, 0, sizeof (cm));
2082 cm.header.size = htons (sizeof (cm));
2083 cm.header.type = htons (GNUNET_MESSAGE_TYPE_DV_CONNECT);
2084 cm.distance = htonl (route->target.distance);
2085 cm.peer = route->target.peer;
2087 GNUNET_SERVER_notification_context_unicast (nc,
2096 * Handle START-message. This is the first message sent to us
2097 * by the client (can only be one!).
2099 * @param cls closure (always NULL)
2100 * @param client identification of the client
2101 * @param message the actual message
2104 handle_start (void *cls, struct GNUNET_SERVER_Client *client,
2105 const struct GNUNET_MessageHeader *message)
2107 GNUNET_SERVER_notification_context_add (nc, client);
2108 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2109 GNUNET_CONTAINER_multipeermap_iterate (all_routes,
2116 * Called on core init.
2119 * @param identity this peer's identity
2122 core_init (void *cls,
2123 const struct GNUNET_PeerIdentity *identity)
2125 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2127 GNUNET_i2s (identity));
2128 my_identity = *identity;
2133 * Process dv requests.
2135 * @param cls closure
2136 * @param server the initialized server
2137 * @param c configuration to use
2140 run (void *cls, struct GNUNET_SERVER_Handle *server,
2141 const struct GNUNET_CONFIGURATION_Handle *c)
2143 static struct GNUNET_CORE_MessageHandler core_handlers[] = {
2144 {&handle_dv_route_message, GNUNET_MESSAGE_TYPE_DV_ROUTE, 0},
2147 static struct GNUNET_SERVER_MessageHandler plugin_handlers[] = {
2148 {&handle_start, NULL,
2149 GNUNET_MESSAGE_TYPE_DV_START,
2150 sizeof (struct GNUNET_MessageHeader) },
2151 { &handle_dv_send_message, NULL,
2152 GNUNET_MESSAGE_TYPE_DV_SEND,
2156 in_shutdown = GNUNET_NO;
2158 direct_neighbors = GNUNET_CONTAINER_multipeermap_create (128, GNUNET_NO);
2159 all_routes = GNUNET_CONTAINER_multipeermap_create (65536, GNUNET_NO);
2160 core_api = GNUNET_CORE_connect (cfg, NULL,
2162 &handle_core_connect,
2163 &handle_core_disconnect,
2168 if (NULL == core_api)
2170 ats = GNUNET_ATS_performance_init (cfg, &handle_ats_update, NULL);
2173 GNUNET_CORE_disconnect (core_api);
2177 nc = GNUNET_SERVER_notification_context_create (server,
2178 MAX_QUEUE_SIZE_PLUGIN);
2179 stats = GNUNET_STATISTICS_create ("dv", cfg);
2180 GNUNET_SERVER_add_handlers (server, plugin_handlers);
2181 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL,
2182 &shutdown_task, NULL);
2187 * The main function for the dv service.
2189 * @param argc number of arguments from the command line
2190 * @param argv command line arguments
2191 * @return 0 ok, 1 on error
2194 main (int argc, char *const *argv)
2196 return (GNUNET_OK ==
2197 GNUNET_SERVICE_run (argc, argv, "dv", GNUNET_SERVICE_OPTION_NONE,
2198 &run, NULL)) ? 0 : 1;
2201 /* end of gnunet-service-dv.c */