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.
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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 * Ultimate target for the message.
150 struct GNUNET_PeerIdentity ultimate_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_MultiHashMap *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 peer, not from us!
210 struct GNUNET_CONTAINER_MultiHashMap *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 * Flag set within 'check_target_removed' to trigger full global route refresh.
258 * Our distance to this peer, 0 for unknown.
263 * Is this neighbor connected at the core level?
271 * A route includes information about the next hop,
272 * the target, and the ultimate distance to the
279 * Which peer do we need to forward the message to?
281 struct DirectNeighbor *next_hop;
284 * What would be the target, and how far is it away?
286 struct Target target;
289 * Offset of this target in the respective consensus set.
291 unsigned int set_offset;
297 * Set of targets we bring to a consensus; all targets in a set have a
298 * distance equal to the sets distance (which is implied by the array
305 * Array of targets in the set, may include NULL entries if a
306 * neighbor has disconnected; the targets are allocated with the
307 * respective container (all_routes), not here.
309 struct Route **targets;
312 * Size of the 'targets' array.
314 unsigned int array_length;
320 * Hashmap of all of our neighbors; processing these usually requires
321 * first checking to see if the peer is core-connected and if the
322 * distance is 1, in which case they are direct neighbors.
324 static struct GNUNET_CONTAINER_MultiHashMap *direct_neighbors;
327 * Hashmap with all routes that we currently support; contains
328 * routing information for all peers from distance 2
329 * up to distance DEFAULT_FISHEYE_DEPTH.
331 static struct GNUNET_CONTAINER_MultiHashMap *all_routes;
334 * Array of consensus sets we expose to the outside world. Sets
335 * are structured by the distance to the target.
337 static struct ConsensusSet consensi[DEFAULT_FISHEYE_DEPTH - 1];
340 * Handle to the core service api.
342 static struct GNUNET_CORE_Handle *core_api;
345 * The identity of our peer.
347 static struct GNUNET_PeerIdentity my_identity;
350 * The configuration for this service.
352 static const struct GNUNET_CONFIGURATION_Handle *cfg;
355 * The client, the DV plugin connected to us (or an event monitor).
356 * Hopefully this client will never change, although if the plugin
357 * dies and returns for some reason it may happen.
359 static struct GNUNET_SERVER_NotificationContext *nc;
362 * Handle for the statistics service.
364 static struct GNUNET_STATISTICS_Handle *stats;
367 * Handle to ATS service.
369 static struct GNUNET_ATS_PerformanceHandle *ats;
373 * Start creating a new DV set union by initiating the connection.
375 * @param cls the 'struct DirectNeighbor' of the peer we're building
376 * a routing consensus with
377 * @param tc scheduler context
380 initiate_set_union (void *cls,
381 const struct GNUNET_SCHEDULER_TaskContext *tc);
385 * Start creating a new DV set union construction, our neighbour has
386 * asked for it (callback for listening peer).
388 * @param cls the 'struct DirectNeighbor' of the peer we're building
389 * a routing consensus with
390 * @param other_peer the other peer
391 * @param context_msg message with application specific information from
393 * @param request request from the other peer, use GNUNET_SET_accept
394 * to accept it, otherwise the request will be refused
395 * Note that we don't use a return value here, as it is also
396 * necessary to specify the set we want to do the operation with,
397 * whith sometimes can be derived from the context message.
398 * Also necessary to specify the timeout.
401 listen_set_union (void *cls,
402 const struct GNUNET_PeerIdentity *other_peer,
403 const struct GNUNET_MessageHeader *context_msg,
404 struct GNUNET_SET_Request *request);
408 * Forward a message from another peer to the plugin.
410 * @param message the message to send to the plugin
411 * @param origin the original sender of the message
412 * @param distance distance to the original sender of the message
415 send_data_to_plugin (const struct GNUNET_MessageHeader *message,
416 const struct GNUNET_PeerIdentity *origin,
419 struct GNUNET_DV_ReceivedMessage *received_msg;
422 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
423 "Delivering message from peer `%s'\n",
424 GNUNET_i2s (origin));
425 size = sizeof (struct GNUNET_DV_ReceivedMessage) +
426 ntohs (message->size);
427 if (size >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
429 GNUNET_break (0); /* too big */
432 received_msg = GNUNET_malloc (size);
433 received_msg->header.size = htons (size);
434 received_msg->header.type = htons (GNUNET_MESSAGE_TYPE_DV_RECV);
435 received_msg->distance = htonl (distance);
436 received_msg->sender = *origin;
437 memcpy (&received_msg[1], message, ntohs (message->size));
438 GNUNET_SERVER_notification_context_broadcast (nc,
439 &received_msg->header,
441 GNUNET_free (received_msg);
446 * Forward a control message to the plugin.
448 * @param message the message to send to the plugin
451 send_control_to_plugin (const struct GNUNET_MessageHeader *message)
453 GNUNET_SERVER_notification_context_broadcast (nc,
460 * Give an (N)ACK message to the plugin, we transmitted a message for it.
462 * @param target peer that received the message
463 * @param uid plugin-chosen UID for the message
464 * @param nack GNUNET_NO to send ACK, GNUNET_YES to send NACK
467 send_ack_to_plugin (const struct GNUNET_PeerIdentity *target,
471 struct GNUNET_DV_AckMessage ack_msg;
473 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
474 "Delivering ACK for message to peer `%s'\n",
475 GNUNET_i2s (target));
476 ack_msg.header.size = htons (sizeof (ack_msg));
477 ack_msg.header.type = htons ((GNUNET_YES == nack)
478 ? GNUNET_MESSAGE_TYPE_DV_SEND_NACK
479 : GNUNET_MESSAGE_TYPE_DV_SEND_ACK);
480 ack_msg.uid = htonl (uid);
481 ack_msg.target = *target;
482 send_control_to_plugin (&ack_msg.header);
487 * Send a DISTANCE_CHANGED message to the plugin.
489 * @param peer peer with a changed distance
490 * @param distance new distance to the peer
493 send_distance_change_to_plugin (const struct GNUNET_PeerIdentity *peer,
496 struct GNUNET_DV_DistanceUpdateMessage du_msg;
498 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
499 "Delivering DISTANCE_CHANGED for message about peer `%s'\n",
501 du_msg.header.size = htons (sizeof (du_msg));
502 du_msg.header.type = htons (GNUNET_MESSAGE_TYPE_DV_DISTANCE_CHANGED);
503 du_msg.distance = htonl (distance);
505 send_control_to_plugin (&du_msg.header);
510 * Give a CONNECT message to the plugin.
512 * @param target peer that connected
513 * @param distance distance to the target
516 send_connect_to_plugin (const struct GNUNET_PeerIdentity *target,
519 struct GNUNET_DV_ConnectMessage cm;
521 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
522 "Delivering CONNECT about peer `%s'\n",
523 GNUNET_i2s (target));
524 cm.header.size = htons (sizeof (cm));
525 cm.header.type = htons (GNUNET_MESSAGE_TYPE_DV_CONNECT);
526 cm.distance = htonl (distance);
528 send_control_to_plugin (&cm.header);
533 * Give a DISCONNECT message to the plugin.
535 * @param target peer that disconnected
538 send_disconnect_to_plugin (const struct GNUNET_PeerIdentity *target)
540 struct GNUNET_DV_DisconnectMessage dm;
542 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
543 "Delivering DISCONNECT about peer `%s'\n",
544 GNUNET_i2s (target));
545 dm.header.size = htons (sizeof (dm));
546 dm.header.type = htons (GNUNET_MESSAGE_TYPE_DV_DISCONNECT);
547 dm.reserved = htonl (0);
549 send_control_to_plugin (&dm.header);
554 * Function called to transfer a message to another peer
557 * @param cls closure with the direct neighbor
558 * @param size number of bytes available in buf
559 * @param buf where the callee should write the message
560 * @return number of bytes written to buf
563 core_transmit_notify (void *cls, size_t size, void *buf)
565 struct DirectNeighbor *dn = cls;
567 struct PendingMessage *pending;
574 /* peer disconnected */
578 pending = dn->pm_head;
580 while ( (NULL != (pending = dn->pm_head)) &&
581 (size >= off + (msize = ntohs (pending->msg->size))))
584 GNUNET_CONTAINER_DLL_remove (dn->pm_head,
587 memcpy (&cbuf[off], pending->msg, msize);
588 if (0 != pending->uid)
589 send_ack_to_plugin (&pending->ultimate_target,
592 GNUNET_free (pending);
595 if (NULL != dn->pm_head)
597 GNUNET_CORE_notify_transmit_ready (core_api,
598 GNUNET_YES /* cork */,
600 GNUNET_TIME_UNIT_FOREVER_REL,
603 &core_transmit_notify, dn);
609 * Forward the given payload to the given target.
611 * @param target where to send the message
612 * @param uid unique ID for the message
613 * @param ultimate_target ultimate recipient for the message
614 * @param distance expected (remaining) distance to the target
615 * @param sender original sender of the message
616 * @param payload payload of the message
619 forward_payload (struct DirectNeighbor *target,
622 const struct GNUNET_PeerIdentity *sender,
623 const struct GNUNET_PeerIdentity *ultimate_target,
624 const struct GNUNET_MessageHeader *payload)
626 struct PendingMessage *pm;
627 struct RouteMessage *rm;
630 if ( (target->pm_queue_size >= MAX_QUEUE_SIZE) &&
631 (0 != memcmp (sender,
633 sizeof (struct GNUNET_PeerIdentity))) )
635 GNUNET_break (0 == uid);
638 msize = sizeof (struct RouteMessage) + ntohs (payload->size);
639 if (msize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
644 pm = GNUNET_malloc (sizeof (struct PendingMessage) + msize);
645 pm->ultimate_target = *ultimate_target;
647 pm->msg = (const struct GNUNET_MessageHeader *) &pm[1];
648 rm = (struct RouteMessage *) &pm[1];
649 rm->header.size = htons ((uint16_t) msize);
650 rm->header.type = htons (GNUNET_MESSAGE_TYPE_DV_ROUTE);
651 rm->distance = htonl (distance);
652 rm->target = target->peer;
653 rm->sender = *sender;
654 memcpy (&rm[1], payload, ntohs (payload->size));
655 GNUNET_CONTAINER_DLL_insert_tail (target->pm_head,
658 target->pm_queue_size++;
659 if (NULL == target->cth)
660 target->cth = GNUNET_CORE_notify_transmit_ready (core_api,
661 GNUNET_YES /* cork */,
663 GNUNET_TIME_UNIT_FOREVER_REL,
666 &core_transmit_notify, target);
671 * Find a free slot for storing a 'route' in the 'consensi'
672 * set at the given distance.
674 * @param distance distance to use for the set slot
677 get_consensus_slot (uint32_t distance)
679 struct ConsensusSet *cs;
682 cs = &consensi[distance];
684 while ( (i < cs->array_length) &&
685 (NULL != cs->targets[i]) ) i++;
686 if (i == cs->array_length)
687 GNUNET_array_grow (cs->targets,
689 cs->array_length * 2 + 2);
695 * Allocate a slot in the consensus set for a route.
697 * @param route route to initialize
698 * @param distance which consensus set to use
701 allocate_route (struct Route *route,
706 i = get_consensus_slot (distance);
707 route->set_offset = i;
708 consensi[distance].targets[i] = route;
709 route->target.distance = htonl (distance);
714 * Release a slot in the consensus set for a route.
716 * @param route route to release the slot from
719 release_route (struct Route *route)
721 consensi[ntohl (route->target.distance)].targets[route->set_offset] = NULL;
722 route->set_offset = UINT_MAX; /* indicate invalid slot */
727 * Move a route from one consensus set to another.
729 * @param route route to move
730 * @param new_distance new distance for the route (destination set)
733 move_route (struct Route *route,
734 uint32_t new_distance)
738 release_route (route);
739 i = get_consensus_slot (new_distance);
740 route->set_offset = i;
741 consensi[new_distance].targets[i] = route;
742 route->target.distance = htonl (new_distance);
747 * Initialize this neighbors 'my_set' and when done give
748 * it to the pending set operation for execution.
750 * @param cls the neighbor for which we are building the set
753 build_set (void *cls)
755 struct DirectNeighbor *neighbor = cls;
756 struct GNUNET_SET_Element element;
758 while ( (DEFAULT_FISHEYE_DEPTH - 1 > neighbor->consensus_insertion_distance) &&
759 (consensi[neighbor->consensus_insertion_distance].array_length == neighbor->consensus_insertion_offset) )
761 neighbor->consensus_insertion_offset = 0;
762 neighbor->consensus_insertion_distance++;
763 /* skip over NULL entries */
764 while ( (DEFAULT_FISHEYE_DEPTH - 1 > neighbor->consensus_insertion_distance) &&
765 (consensi[neighbor->consensus_insertion_distance].array_length < neighbor->consensus_insertion_offset) &&
766 (NULL == consensi[neighbor->consensus_insertion_distance].targets[neighbor->consensus_insertion_offset]) )
767 neighbor->consensus_insertion_offset++;
769 if (DEFAULT_FISHEYE_DEPTH - 1 == neighbor->consensus_insertion_distance)
771 /* we have added all elements to the set, run the operation */
773 GNUNET_SET_operation_conclude (neighbor->my_op,
776 GNUNET_SET_destroy (neighbor->my_set);
777 neighbor->my_set = NULL;
780 element.size = sizeof (struct Target);
781 element.data = &consensi[neighbor->consensus_insertion_distance].targets[neighbor->consensus_insertion_offset++]->target;
783 /* skip over NULL entries */
784 while ( (DEFAULT_FISHEYE_DEPTH - 1 > neighbor->consensus_insertion_distance) &&
785 (consensi[neighbor->consensus_insertion_distance].array_length < neighbor->consensus_insertion_offset) &&
786 (NULL == consensi[neighbor->consensus_insertion_distance].targets[neighbor->consensus_insertion_offset]) )
787 neighbor->consensus_insertion_offset++;
788 GNUNET_SET_add_element (neighbor->my_set,
790 &build_set, neighbor);
796 * A peer is now connected to us at distance 1. Initiate DV exchange.
798 * @param neighbor entry for the neighbor at distance 1
801 handle_direct_connect (struct DirectNeighbor *neighbor)
804 struct GNUNET_HashCode session_id;
806 GNUNET_STATISTICS_update (stats,
807 "# peers connected (1-hop)",
809 route = GNUNET_CONTAINER_multihashmap_get (all_routes,
810 &neighbor->peer.hashPubKey);
813 send_disconnect_to_plugin (&neighbor->peer);
814 release_route (route);
817 /* construct session ID seed as XOR of both peer's identities */
818 GNUNET_CRYPTO_hash_xor (&my_identity.hashPubKey,
819 &neighbor->peer.hashPubKey,
821 /* make sure session ID is unique across applications by salting it with 'DV' */
822 GNUNET_CRYPTO_hkdf (&neighbor->real_session_id, sizeof (struct GNUNET_HashCode),
823 GCRY_MD_SHA512, GCRY_MD_SHA256,
825 &session_id, sizeof (session_id),
827 if (1 == GNUNET_CRYPTO_hash_cmp (&neighbor->peer.hashPubKey,
828 &my_identity.hashPubKey))
829 neighbor->initiate_task = GNUNET_SCHEDULER_add_now (&initiate_set_union,
832 neighbor->listen_handle = GNUNET_SET_listen (cfg,
833 GNUNET_SET_OPERATION_UNION,
834 &neighbor->real_session_id,
841 * Method called whenever a peer connects.
844 * @param peer peer identity this notification is about
847 handle_core_connect (void *cls, const struct GNUNET_PeerIdentity *peer)
849 struct DirectNeighbor *neighbor;
851 /* Check for connect to self message */
852 if (0 == memcmp (&my_identity, peer, sizeof (struct GNUNET_PeerIdentity)))
854 /* check if entry exists */
855 neighbor = GNUNET_CONTAINER_multihashmap_get (direct_neighbors,
857 if (NULL != neighbor)
859 GNUNET_break (GNUNET_YES != neighbor->connected);
860 neighbor->connected = GNUNET_YES;
861 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
862 "Core connected to %s (distance %u)\n",
864 (unsigned int) neighbor->distance);
865 if (DIRECT_NEIGHBOR_COST != neighbor->distance)
867 handle_direct_connect (neighbor);
870 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
871 "Core connected to %s (distance unknown)\n",
873 neighbor = GNUNET_malloc (sizeof (struct DirectNeighbor));
874 neighbor->peer = *peer;
875 GNUNET_assert (GNUNET_YES ==
876 GNUNET_CONTAINER_multihashmap_put (direct_neighbors,
879 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
880 neighbor->connected = GNUNET_YES;
881 neighbor->distance = 0; /* unknown */
886 * Called for each 'target' in a neighbor table to free the associated memory.
889 * @param key key of the value
890 * @param value value to free
891 * @return GNUNET_OK to continue to iterate
894 free_targets (void *cls,
895 const struct GNUNET_HashCode *key,
904 * Multihashmap iterator for checking if a given route is
905 * (now) useful to this peer.
907 * @param cls the direct neighbor for the given route
908 * @param key key value stored under
909 * @param value a 'struct Target' that may or may not be useful; not that
910 * the distance in 'target' does not include the first hop yet
911 * @return GNUNET_YES to continue iteration, GNUNET_NO to stop
914 check_possible_route (void *cls, const struct GNUNET_HashCode * key, void *value)
916 struct DirectNeighbor *neighbor = cls;
917 struct Target *target = value;
920 route = GNUNET_CONTAINER_multihashmap_get (all_routes,
924 if (ntohl (route->target.distance) > ntohl (target->distance) + 1)
926 /* this 'target' is cheaper than the existing route; switch to alternative route! */
927 move_route (route, ntohl (target->distance) + 1);
928 route->next_hop = neighbor;
929 send_distance_change_to_plugin (&target->peer, ntohl (target->distance) + 1);
931 return GNUNET_YES; /* got a route to this target already */
933 route = GNUNET_malloc (sizeof (struct Route));
934 route->next_hop = neighbor;
935 route->target.distance = htonl (ntohl (target->distance) + 1);
936 route->target.peer = target->peer;
937 allocate_route (route, ntohl (route->target.distance));
938 GNUNET_assert (GNUNET_YES ==
939 GNUNET_CONTAINER_multihashmap_put (all_routes,
940 &route->target.peer.hashPubKey,
942 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
943 send_connect_to_plugin (&route->target.peer, ntohl (target->distance));
949 * Multihashmap iterator for finding routes that were previously
950 * "hidden" due to a better route (called after a disconnect event).
953 * @param key peer identity of the given direct neighbor
954 * @param value a 'struct DirectNeighbor' to check for additional routes
955 * @return GNUNET_YES to continue iteration
958 refresh_routes (void *cls, const struct GNUNET_HashCode * key, void *value)
960 struct DirectNeighbor *neighbor = value;
962 if ( (GNUNET_YES != neighbor->connected) ||
963 (DIRECT_NEIGHBOR_COST != neighbor->distance) )
965 if (NULL != neighbor->neighbor_table)
966 GNUNET_CONTAINER_multihashmap_iterate (neighbor->neighbor_table,
967 &check_possible_route,
974 * Get distance information from 'atsi'.
976 * @param atsi performance data
977 * @param atsi_count number of entries in atsi
978 * @return connected transport distance
981 get_atsi_distance (const struct GNUNET_ATS_Information *atsi,
986 for (i = 0; i < atsi_count; i++)
987 if (ntohl (atsi[i].type) == GNUNET_ATS_QUALITY_NET_DISTANCE)
988 return (0 == ntohl (atsi->value)) ? DIRECT_NEIGHBOR_COST : ntohl (atsi->value); // FIXME: 0 check should not be required once ATS is fixed!
989 /* If we do not have explicit distance data, assume direct neighbor. */
990 return DIRECT_NEIGHBOR_COST;
995 * Multihashmap iterator for freeing routes that go via a particular
996 * neighbor that disconnected and is thus no longer available.
998 * @param cls the direct neighbor that is now unavailable
999 * @param key key value stored under
1000 * @param value a 'struct Route' that may or may not go via neighbor
1002 * @return GNUNET_YES to continue iteration, GNUNET_NO to stop
1005 cull_routes (void *cls, const struct GNUNET_HashCode * key, void *value)
1007 struct DirectNeighbor *neighbor = cls;
1008 struct Route *route = value;
1010 if (route->next_hop != neighbor)
1011 return GNUNET_YES; /* not affected */
1012 GNUNET_assert (GNUNET_YES ==
1013 GNUNET_CONTAINER_multihashmap_remove (all_routes, key, value));
1014 release_route (route);
1015 send_disconnect_to_plugin (&route->target.peer);
1016 GNUNET_free (route);
1022 * Handle the case that a direct connection to a peer is
1023 * disrupted. Remove all routes via that peer and
1024 * stop the consensus with it.
1026 * @param neighbor peer that was disconnected (or at least is no
1027 * longer at distance 1)
1030 handle_direct_disconnect (struct DirectNeighbor *neighbor)
1032 GNUNET_CONTAINER_multihashmap_iterate (all_routes,
1035 if (NULL != neighbor->cth)
1037 GNUNET_CORE_notify_transmit_ready_cancel (neighbor->cth);
1038 neighbor->cth = NULL;
1040 if (NULL != neighbor->neighbor_table_consensus)
1042 GNUNET_CONTAINER_multihashmap_iterate (neighbor->neighbor_table_consensus,
1045 GNUNET_CONTAINER_multihashmap_destroy (neighbor->neighbor_table_consensus);
1046 neighbor->neighbor_table_consensus = NULL;
1048 if (NULL != neighbor->neighbor_table)
1050 GNUNET_CONTAINER_multihashmap_iterate (neighbor->neighbor_table,
1053 GNUNET_CONTAINER_multihashmap_destroy (neighbor->neighbor_table);
1054 neighbor->neighbor_table = NULL;
1056 if (NULL != neighbor->set_op)
1058 GNUNET_SET_operation_cancel (neighbor->set_op);
1059 neighbor->set_op = NULL;
1061 if (NULL != neighbor->my_set)
1063 GNUNET_SET_destroy (neighbor->my_set);
1064 neighbor->my_set = NULL;
1066 if (NULL != neighbor->listen_handle)
1068 GNUNET_SET_listen_cancel (neighbor->listen_handle);
1069 neighbor->listen_handle = NULL;
1071 if (GNUNET_SCHEDULER_NO_TASK != neighbor->initiate_task)
1073 GNUNET_SCHEDULER_cancel (neighbor->initiate_task);
1074 neighbor->initiate_task = GNUNET_SCHEDULER_NO_TASK;
1080 * Function that is called with QoS information about an address; used
1081 * to update our current distance to another peer.
1083 * @param cls closure
1084 * @param address the address
1085 * @param active is this address in active use
1086 * @param bandwidth_out assigned outbound bandwidth for the connection
1087 * @param bandwidth_in assigned inbound bandwidth for the connection
1088 * @param ats performance data for the address (as far as known)
1089 * @param ats_count number of performance records in 'ats'
1092 handle_ats_update (void *cls,
1093 const struct GNUNET_HELLO_Address *address,
1095 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out,
1096 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in,
1097 const struct GNUNET_ATS_Information *ats,
1100 struct DirectNeighbor *neighbor;
1103 if (GNUNET_NO == active)
1105 distance = get_atsi_distance (ats, ats_count);
1106 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1107 "ATS says distance to %s is %u\n",
1108 GNUNET_i2s (&address->peer),
1109 (unsigned int) distance);
1110 /* check if entry exists */
1111 neighbor = GNUNET_CONTAINER_multihashmap_get (direct_neighbors,
1112 &address->peer.hashPubKey);
1113 if (NULL != neighbor)
1115 if ( (DIRECT_NEIGHBOR_COST == neighbor->distance) &&
1116 (DIRECT_NEIGHBOR_COST == distance) )
1117 return; /* no change */
1118 if (DIRECT_NEIGHBOR_COST == neighbor->distance)
1120 neighbor->distance = distance;
1121 GNUNET_STATISTICS_update (stats,
1122 "# peers connected (1-hop)",
1124 handle_direct_disconnect (neighbor);
1125 GNUNET_CONTAINER_multihashmap_iterate (direct_neighbors,
1130 neighbor->distance = distance;
1131 if (DIRECT_NEIGHBOR_COST != neighbor->distance)
1133 if (GNUNET_YES != neighbor->connected)
1135 handle_direct_connect (neighbor);
1138 neighbor = GNUNET_malloc (sizeof (struct DirectNeighbor));
1139 neighbor->peer = address->peer;
1140 GNUNET_assert (GNUNET_YES ==
1141 GNUNET_CONTAINER_multihashmap_put (direct_neighbors,
1142 &address->peer.hashPubKey,
1144 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
1145 neighbor->connected = GNUNET_NO; /* not yet */
1146 neighbor->distance = distance;
1151 * Check if a target was removed from the set of the other peer; if so,
1152 * if we also used it for our route, we need to remove it from our
1153 * 'all_routes' set (and later check if an alternative path now exists).
1155 * @param cls the 'struct DirectNeighbor'
1156 * @param key peer identity for the target
1157 * @param value a 'struct Target' previously reachable via the given neighbor
1160 check_target_removed (void *cls,
1161 const struct GNUNET_HashCode *key,
1164 struct DirectNeighbor *neighbor = cls;
1165 struct Target *new_target;
1166 struct Route *current_route;
1168 new_target = GNUNET_CONTAINER_multihashmap_get (neighbor->neighbor_table_consensus,
1170 if (NULL == new_target)
1172 /* target was revoked, check if it was used */
1173 current_route = GNUNET_CONTAINER_multihashmap_get (all_routes,
1175 if ( (NULL == current_route) ||
1176 (current_route->next_hop != neighbor) )
1178 /* didn't matter, wasn't used */
1181 /* remove existing route */
1182 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1183 "Lost route to %s\n",
1184 GNUNET_i2s (¤t_route->target.peer));
1185 GNUNET_assert (GNUNET_YES ==
1186 GNUNET_CONTAINER_multihashmap_remove (all_routes, key, current_route));
1187 send_disconnect_to_plugin (¤t_route->target.peer);
1188 GNUNET_free (current_route);
1189 neighbor->target_removed = GNUNET_YES;
1197 * Check if a target was added to the set of the other peer; if it
1198 * was added or impoves the existing route, do the needed updates.
1200 * @param cls the 'struct DirectNeighbor'
1201 * @param key peer identity for the target
1202 * @param value a 'struct Target' now reachable via the given neighbor
1205 check_target_added (void *cls,
1206 const struct GNUNET_HashCode *key,
1209 struct DirectNeighbor *neighbor = cls;
1210 struct Target *target = value;
1211 struct Route *current_route;
1213 /* target was revoked, check if it was used */
1214 current_route = GNUNET_CONTAINER_multihashmap_get (all_routes,
1216 if (NULL != current_route)
1219 if (current_route->next_hop == neighbor)
1221 /* we had the same route before, no change */
1222 if (ntohl (target->distance) + 1 != ntohl (current_route->target.distance))
1224 current_route->target.distance = htonl (ntohl (target->distance) + 1);
1225 send_distance_change_to_plugin (&target->peer, ntohl (target->distance) + 1);
1229 if (ntohl (current_route->target.distance) >= ntohl (target->distance) + 1)
1231 /* alternative, shorter route exists, ignore */
1234 /* new route is better than the existing one, take over! */
1235 /* NOTE: minor security issue: malicious peers may advertise
1236 very short routes to take over longer paths; as we don't
1237 check that the shorter routes actually work, a malicious
1238 direct neighbor can use this to DoS our long routes */
1239 current_route->next_hop = neighbor;
1240 current_route->target.distance = htonl (ntohl (target->distance) + 1);
1241 send_distance_change_to_plugin (&target->peer, ntohl (target->distance) + 1);
1245 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1246 "Discovered new route to %s using %u hops\n",
1247 GNUNET_i2s (&target->peer),
1248 (unsigned int) (ntohl (target->distance) + 1));
1249 current_route = GNUNET_malloc (sizeof (struct Route));
1250 current_route->next_hop = neighbor;
1251 current_route->target.peer = target->peer;
1252 current_route->target.distance = htonl (ntohl (target->distance) + 1);
1253 GNUNET_assert (GNUNET_YES ==
1254 GNUNET_CONTAINER_multihashmap_put (all_routes,
1255 ¤t_route->target.peer.hashPubKey,
1257 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
1258 send_connect_to_plugin (¤t_route->target.peer,
1259 ntohl (current_route->target.distance));
1265 * Callback for set operation results. Called for each element
1266 * in the result set.
1267 * We have learned a new route from the other peer. Add it to the
1268 * route set we're building.
1270 * @param cls the 'struct DirectNeighbor' we're building the consensus with
1271 * @param element a result element, only valid if status is GNUNET_SET_STATUS_OK
1272 * @param status see enum GNUNET_SET_Status
1275 handle_set_union_result (void *cls,
1276 const struct GNUNET_SET_Element *element,
1277 enum GNUNET_SET_Status status)
1279 struct DirectNeighbor *neighbor = cls;
1280 struct Target *target;
1284 case GNUNET_SET_STATUS_OK:
1285 if (sizeof (struct Target) != element->size)
1287 GNUNET_break_op (0);
1290 target = GNUNET_malloc (sizeof (struct Target));
1291 memcpy (target, element->data, sizeof (struct Target));
1293 GNUNET_CONTAINER_multihashmap_put (neighbor->neighbor_table_consensus,
1294 &target->peer.hashPubKey,
1296 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
1298 GNUNET_break_op (0);
1299 GNUNET_free (target);
1302 case GNUNET_SET_STATUS_TIMEOUT:
1303 case GNUNET_SET_STATUS_FAILURE:
1304 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1305 "Failed to establish DV union, will try again later\n");
1306 GNUNET_SET_operation_cancel (neighbor->set_op); /* FIXME: needed? */
1307 neighbor->set_op = NULL;
1308 if (NULL != neighbor->neighbor_table_consensus)
1310 GNUNET_CONTAINER_multihashmap_iterate (neighbor->neighbor_table_consensus,
1313 GNUNET_CONTAINER_multihashmap_destroy (neighbor->neighbor_table_consensus);
1314 neighbor->neighbor_table_consensus = NULL;
1316 if (1 == GNUNET_CRYPTO_hash_cmp (&neighbor->peer.hashPubKey,
1317 &my_identity.hashPubKey))
1318 neighbor->initiate_task = GNUNET_SCHEDULER_add_delayed (GNUNET_DV_CONSENSUS_FREQUENCY,
1319 &initiate_set_union,
1322 case GNUNET_SET_STATUS_HALF_DONE:
1323 /* we got all of our updates; integrate routing table! */
1324 neighbor->target_removed = GNUNET_NO;
1325 GNUNET_CONTAINER_multihashmap_iterate (neighbor->neighbor_table,
1326 &check_target_removed,
1328 if (GNUNET_YES == neighbor->target_removed)
1330 /* check if we got an alternative for the removed routes */
1331 GNUNET_CONTAINER_multihashmap_iterate (direct_neighbors,
1335 /* add targets that appeared (and check for improved routes) */
1336 GNUNET_CONTAINER_multihashmap_iterate (neighbor->neighbor_table_consensus,
1337 &check_target_added,
1339 if (NULL != neighbor->neighbor_table)
1341 GNUNET_CONTAINER_multihashmap_iterate (neighbor->neighbor_table,
1344 GNUNET_CONTAINER_multihashmap_destroy (neighbor->neighbor_table);
1345 neighbor->neighbor_table = NULL;
1347 neighbor->neighbor_table = neighbor->neighbor_table_consensus;
1348 neighbor->neighbor_table_consensus = NULL;
1350 case GNUNET_SET_STATUS_DONE:
1351 /* operation done, schedule next run! */
1352 GNUNET_SET_operation_cancel (neighbor->set_op); /* FIXME: needed? */
1353 neighbor->set_op = NULL;
1354 if (1 == GNUNET_CRYPTO_hash_cmp (&neighbor->peer.hashPubKey,
1355 &my_identity.hashPubKey))
1356 neighbor->initiate_task = GNUNET_SCHEDULER_add_delayed (GNUNET_DV_CONSENSUS_FREQUENCY,
1357 &initiate_set_union,
1368 * Start creating a new DV set union construction, our neighbour has
1369 * asked for it (callback for listening peer).
1371 * @param cls the 'struct DirectNeighbor' of the peer we're building
1372 * a routing consensus with
1373 * @param other_peer the other peer
1374 * @param context_msg message with application specific information from
1376 * @param request request from the other peer, use GNUNET_SET_accept
1377 * to accept it, otherwise the request will be refused
1378 * Note that we don't use a return value here, as it is also
1379 * necessary to specify the set we want to do the operation with,
1380 * whith sometimes can be derived from the context message.
1381 * Also necessary to specify the timeout.
1384 listen_set_union (void *cls,
1385 const struct GNUNET_PeerIdentity *other_peer,
1386 const struct GNUNET_MessageHeader *context_msg,
1387 struct GNUNET_SET_Request *request)
1389 struct DirectNeighbor *neighbor = cls;
1391 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1392 "Starting to create consensus with %s!\n",
1393 GNUNET_i2s (&neighbor->peer));
1394 if (NULL != neighbor->set_op)
1396 GNUNET_SET_operation_cancel (neighbor->set_op);
1397 neighbor->set_op = NULL;
1399 if (NULL != neighbor->my_set)
1401 GNUNET_SET_destroy (neighbor->my_set);
1402 neighbor->my_set = NULL;
1404 neighbor->my_set = GNUNET_SET_create (cfg,
1405 GNUNET_SET_OPERATION_UNION);
1406 neighbor->set_op = GNUNET_SET_accept (request,
1407 neighbor->my_set /* FIXME: pass later! */,
1408 GNUNET_SET_RESULT_ADDED,
1409 &handle_set_union_result,
1411 build_set (neighbor);
1416 * Start creating a new DV set union by initiating the connection.
1418 * @param cls the 'struct DirectNeighbor' of the peer we're building
1419 * a routing consensus with
1420 * @param tc scheduler context
1423 initiate_set_union (void *cls,
1424 const struct GNUNET_SCHEDULER_TaskContext *tc)
1426 struct DirectNeighbor *neighbor = cls;
1428 neighbor->initiate_task = GNUNET_SCHEDULER_NO_TASK;
1429 neighbor->my_set = GNUNET_SET_create (cfg,
1430 GNUNET_SET_OPERATION_UNION);
1431 neighbor->set_op = GNUNET_SET_evaluate (neighbor->my_set /* FIXME: pass later! */,
1433 &neighbor->real_session_id,
1435 0 /* FIXME: salt */,
1436 GNUNET_SET_RESULT_ADDED,
1437 &handle_set_union_result,
1439 build_set (neighbor);
1444 * Core handler for DV data messages. Whatever this message
1445 * contains all we really have to do is rip it out of its
1446 * DV layering and give it to our pal the DV plugin to report
1449 * @param cls closure
1450 * @param peer peer which sent the message (immediate sender)
1451 * @param message the message
1452 * @return GNUNET_OK on success, GNUNET_SYSERR if the other peer violated the protocol
1455 handle_dv_route_message (void *cls, const struct GNUNET_PeerIdentity *peer,
1456 const struct GNUNET_MessageHeader *message)
1458 const struct RouteMessage *rm;
1459 const struct GNUNET_MessageHeader *payload;
1460 struct Route *route;
1462 if (ntohs (message->size) < sizeof (struct RouteMessage) + sizeof (struct GNUNET_MessageHeader))
1464 GNUNET_break_op (0);
1465 return GNUNET_SYSERR;
1467 rm = (const struct RouteMessage *) message;
1468 payload = (const struct GNUNET_MessageHeader *) &rm[1];
1469 if (ntohs (message->size) != sizeof (struct RouteMessage) + ntohs (payload->size))
1471 GNUNET_break_op (0);
1472 return GNUNET_SYSERR;
1474 if (0 == memcmp (&rm->target,
1476 sizeof (struct GNUNET_PeerIdentity)))
1478 /* message is for me, check reverse route! */
1479 route = GNUNET_CONTAINER_multihashmap_get (all_routes,
1480 &rm->sender.hashPubKey);
1483 /* don't have reverse route, drop */
1484 GNUNET_STATISTICS_update (stats,
1485 "# message discarded (no reverse route)",
1489 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1490 "Delivering %u bytes to myself!\n",
1491 ntohs (payload->size));
1492 send_data_to_plugin (payload,
1494 ntohl (route->target.distance));
1497 route = GNUNET_CONTAINER_multihashmap_get (all_routes,
1498 &rm->target.hashPubKey);
1501 GNUNET_STATISTICS_update (stats,
1502 "# messages discarded (no route)",
1506 if (ntohl (route->target.distance) > ntohl (rm->distance) + 1)
1508 GNUNET_STATISTICS_update (stats,
1509 "# messages discarded (target too far)",
1513 forward_payload (route->next_hop,
1514 ntohl (route->target.distance),
1524 * Service server's handler for message send requests (which come
1525 * bubbling up to us through the DV plugin).
1527 * @param cls closure
1528 * @param client identification of the client
1529 * @param message the actual message
1532 handle_dv_send_message (void *cls, struct GNUNET_SERVER_Client *client,
1533 const struct GNUNET_MessageHeader *message)
1535 struct Route *route;
1536 const struct GNUNET_DV_SendMessage *msg;
1537 const struct GNUNET_MessageHeader *payload;
1539 if (ntohs (message->size) < sizeof (struct GNUNET_DV_SendMessage) + sizeof (struct GNUNET_MessageHeader))
1542 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1545 msg = (const struct GNUNET_DV_SendMessage *) message;
1546 GNUNET_break (0 != ntohl (msg->uid));
1547 payload = (const struct GNUNET_MessageHeader *) &msg[1];
1548 if (ntohs (message->size) != sizeof (struct GNUNET_DV_SendMessage) + ntohs (payload->size))
1551 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1554 route = GNUNET_CONTAINER_multihashmap_get (all_routes,
1555 &msg->target.hashPubKey);
1558 /* got disconnected */
1559 GNUNET_STATISTICS_update (stats,
1560 "# local messages discarded (no route)",
1562 send_ack_to_plugin (&msg->target, ntohl (msg->uid), GNUNET_YES);
1563 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1566 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1567 "Forwarding %u bytes to %s\n",
1568 ntohs (payload->size),
1569 GNUNET_i2s (&msg->target));
1571 forward_payload (route->next_hop,
1572 ntohl (route->target.distance),
1577 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1582 * Cleanup all of the data structures associated with a given neighbor.
1584 * @param neighbor neighbor to clean up
1587 cleanup_neighbor (struct DirectNeighbor *neighbor)
1589 struct PendingMessage *pending;
1591 while (NULL != (pending = neighbor->pm_head))
1593 neighbor->pm_queue_size--;
1594 GNUNET_CONTAINER_DLL_remove (neighbor->pm_head,
1597 GNUNET_free (pending);
1599 handle_direct_disconnect (neighbor);
1600 GNUNET_assert (GNUNET_YES ==
1601 GNUNET_CONTAINER_multihashmap_remove (direct_neighbors,
1602 &neighbor->peer.hashPubKey,
1604 GNUNET_free (neighbor);
1609 * Method called whenever a given peer disconnects.
1611 * @param cls closure
1612 * @param peer peer identity this notification is about
1615 handle_core_disconnect (void *cls, const struct GNUNET_PeerIdentity *peer)
1617 struct DirectNeighbor *neighbor;
1619 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1620 "Received core peer disconnect message for peer `%s'!\n",
1622 /* Check for disconnect from self message */
1623 if (0 == memcmp (&my_identity, peer, sizeof (struct GNUNET_PeerIdentity)))
1626 GNUNET_CONTAINER_multihashmap_get (direct_neighbors, &peer->hashPubKey);
1627 if (NULL == neighbor)
1632 GNUNET_break (GNUNET_YES == neighbor->connected);
1633 neighbor->connected = GNUNET_NO;
1634 if (DIRECT_NEIGHBOR_COST == neighbor->distance)
1636 GNUNET_STATISTICS_update (stats,
1637 "# peers connected (1-hop)",
1640 cleanup_neighbor (neighbor);
1641 GNUNET_CONTAINER_multihashmap_iterate (direct_neighbors,
1648 * Multihashmap iterator for freeing routes. Should never be called.
1651 * @param key key value stored under
1652 * @param value the route to be freed
1654 * @return GNUNET_YES to continue iteration, GNUNET_NO to stop
1657 free_route (void *cls, const struct GNUNET_HashCode * key, void *value)
1659 struct Route *route = value;
1662 GNUNET_assert (GNUNET_YES ==
1663 GNUNET_CONTAINER_multihashmap_remove (all_routes, key, value));
1664 release_route (route);
1665 send_disconnect_to_plugin (&route->target.peer);
1666 GNUNET_free (route);
1672 * Multihashmap iterator for freeing direct neighbors. Should never be called.
1675 * @param key key value stored under
1676 * @param value the direct neighbor to be freed
1678 * @return GNUNET_YES to continue iteration, GNUNET_NO to stop
1681 free_direct_neighbors (void *cls, const struct GNUNET_HashCode * key, void *value)
1683 struct DirectNeighbor *neighbor = value;
1686 cleanup_neighbor (neighbor);
1692 * Task run during shutdown.
1698 shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1702 GNUNET_CORE_disconnect (core_api);
1704 GNUNET_ATS_performance_done (ats);
1706 GNUNET_CONTAINER_multihashmap_iterate (direct_neighbors,
1707 &free_direct_neighbors, NULL);
1708 GNUNET_CONTAINER_multihashmap_iterate (all_routes,
1710 GNUNET_CONTAINER_multihashmap_destroy (direct_neighbors);
1711 GNUNET_CONTAINER_multihashmap_destroy (all_routes);
1712 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
1714 GNUNET_SERVER_notification_context_destroy (nc);
1716 for (i=0;i<DEFAULT_FISHEYE_DEPTH - 1;i++)
1717 GNUNET_array_grow (consensi[i].targets,
1718 consensi[i].array_length,
1724 * Notify newly connected client about an existing route.
1726 * @param cls the 'struct GNUNET_SERVER_Client'
1727 * @param key peer identity
1728 * @param value the XXX.
1729 * @return GNUNET_OK (continue to iterate)
1732 add_route (void *cls,
1733 const struct GNUNET_HashCode *key,
1736 struct GNUNET_SERVER_Client *client = cls;
1737 struct Route *route = value;
1738 struct GNUNET_DV_ConnectMessage cm;
1740 cm.header.size = htons (sizeof (cm));
1741 cm.header.type = htons (GNUNET_MESSAGE_TYPE_DV_CONNECT);
1742 cm.distance = htonl (route->target.distance);
1743 cm.peer = route->target.peer;
1745 GNUNET_SERVER_notification_context_unicast (nc,
1754 * Handle START-message. This is the first message sent to us
1755 * by the client (can only be one!).
1757 * @param cls closure (always NULL)
1758 * @param client identification of the client
1759 * @param message the actual message
1762 handle_start (void *cls, struct GNUNET_SERVER_Client *client,
1763 const struct GNUNET_MessageHeader *message)
1765 GNUNET_SERVER_notification_context_add (nc, client);
1766 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1767 GNUNET_CONTAINER_multihashmap_iterate (all_routes,
1774 * Called on core init.
1777 * @param server legacy
1778 * @param identity this peer's identity
1781 core_init (void *cls, struct GNUNET_CORE_Handle *server,
1782 const struct GNUNET_PeerIdentity *identity)
1784 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1786 GNUNET_i2s (identity));
1787 my_identity = *identity;
1792 * Process dv requests.
1794 * @param cls closure
1795 * @param server the initialized server
1796 * @param c configuration to use
1799 run (void *cls, struct GNUNET_SERVER_Handle *server,
1800 const struct GNUNET_CONFIGURATION_Handle *c)
1802 static struct GNUNET_CORE_MessageHandler core_handlers[] = {
1803 {&handle_dv_route_message, GNUNET_MESSAGE_TYPE_DV_ROUTE, 0},
1806 static struct GNUNET_SERVER_MessageHandler plugin_handlers[] = {
1807 {&handle_start, NULL,
1808 GNUNET_MESSAGE_TYPE_DV_START,
1809 sizeof (struct GNUNET_MessageHeader) },
1810 { &handle_dv_send_message, NULL,
1811 GNUNET_MESSAGE_TYPE_DV_SEND,
1817 direct_neighbors = GNUNET_CONTAINER_multihashmap_create (128, GNUNET_NO);
1818 all_routes = GNUNET_CONTAINER_multihashmap_create (65536, GNUNET_NO);
1819 core_api = GNUNET_CORE_connect (cfg, NULL,
1821 &handle_core_connect,
1822 &handle_core_disconnect,
1827 if (NULL == core_api)
1829 ats = GNUNET_ATS_performance_init (cfg, &handle_ats_update, NULL);
1832 GNUNET_CORE_disconnect (core_api);
1835 nc = GNUNET_SERVER_notification_context_create (server,
1836 MAX_QUEUE_SIZE_PLUGIN);
1837 stats = GNUNET_STATISTICS_create ("dv", cfg);
1838 GNUNET_SERVER_add_handlers (server, plugin_handlers);
1839 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL,
1840 &shutdown_task, NULL);
1845 * The main function for the dv service.
1847 * @param argc number of arguments from the command line
1848 * @param argv command line arguments
1849 * @return 0 ok, 1 on error
1852 main (int argc, char *const *argv)
1854 return (GNUNET_OK ==
1855 GNUNET_SERVICE_run (argc, argv, "dv", GNUNET_SERVICE_OPTION_NONE,
1856 &run, NULL)) ? 0 : 1;
1859 /* end of gnunet-service-dv.c */