2 This file is part of GNUnet.
3 (C) 2001 - 2011 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
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17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
22 * @file mesh/gnunet-service-mesh.c
23 * @brief GNUnet MESH service
24 * @author Bartlomiej Polot
30 * - PERIODIC FUNCTIONS
31 * - MESH NETWORK HANDLER HELPERS
32 * - MESH NETWORK HANDLES
33 * - MESH LOCAL HANDLER HELPERS
34 * - MESH LOCAL HANDLES
35 * - MAIN FUNCTIONS (main & run)
38 * - error reporting (CREATE/CHANGE/ADD/DEL?) -- new message!
39 * - partial disconnect reporting -- same as error reporting?
40 * - add vs create? change vs. keep-alive? same msg or different ones? -- thinking...
41 * - speed requirement specification (change?) in mesh API -- API call
43 * - relay corking down to core
48 #include "mesh_protocol.h"
49 #include "gnunet_dht_service.h"
50 #include "mesh_tunnel_tree.h"
52 /* TODO: move into configuration file */
53 #define REFRESH_PATH_TIME GNUNET_TIME_relative_multiply(\
54 GNUNET_TIME_UNIT_SECONDS,\
56 #define APP_ANNOUNCE_TIME GNUNET_TIME_relative_multiply(\
57 GNUNET_TIME_UNIT_SECONDS,\
60 #define ID_ANNOUNCE_TIME GNUNET_TIME_relative_multiply(\
61 GNUNET_TIME_UNIT_SECONDS,\
64 #define GET_RESTART_TIME GNUNET_TIME_relative_multiply(\
65 GNUNET_TIME_UNIT_SECONDS,\
68 #define UNACKNOWLEDGED_WAIT GNUNET_TIME_relative_multiply(\
69 GNUNET_TIME_UNIT_SECONDS,\
72 #define MESH_DEBUG_DHT GNUNET_NO
74 /******************************************************************************/
75 /************************ DATA STRUCTURES ****************************/
76 /******************************************************************************/
78 /** FWD declaration */
82 * Struct containing all info possibly needed to build a package when called
85 struct MeshDataDescriptor
87 /** ID of the tunnel this packet travels in */
88 struct MESH_TunnelID *origin;
93 /** Client that asked for the transmission, if any */
94 struct GNUNET_SERVER_Client *client;
96 /** Who was this message being sent to */
97 struct MeshPeerInfo *peer;
99 /** Ultimate destination of the packet */
100 GNUNET_PEER_Id destination;
102 /** Number of identical messages sent to different hops (multicast) */
103 unsigned int *copies;
105 /** Which handler was used to request the transmission */
106 unsigned int handler_n;
108 /** Size of the data */
111 /** Used to allow a client send more traffic to the service after a
112 * previous packet was tried to be sent to a neighbor and couldn't */
113 GNUNET_SCHEDULER_TaskIdentifier *timeout_task;
118 * Struct containing all information regarding a given peer
128 * Last time we heard from this peer
130 struct GNUNET_TIME_Absolute last_contact;
133 * Number of attempts to reconnect so far
135 int n_reconnect_attempts;
138 * Paths to reach the peer, ordered by ascending hop count
140 struct MeshPeerPath *path_head;
143 * Paths to reach the peer, ordered by ascending hop count
145 struct MeshPeerPath *path_tail;
148 * Handle to stop the DHT search for a path to this peer
150 struct GNUNET_DHT_GetHandle *dhtget;
153 * Closure given to the DHT GET
155 struct MeshPathInfo *dhtgetcls;
158 * Handles to stop queued transmissions for this peer
160 struct GNUNET_CORE_TransmitHandle *core_transmit[CORE_QUEUE_SIZE];
163 * Pointer to info stuctures used as cls for queued transmissions
165 void *infos[CORE_QUEUE_SIZE];
168 * Type of message being in each transmission
170 uint16_t types[CORE_QUEUE_SIZE];
173 * Array of tunnels this peer participates in
174 * (most probably a small amount, therefore not a hashmap)
175 * When the path to the peer changes, notify these tunnels to let them
176 * re-adjust their path trees.
178 struct MeshTunnel **tunnels;
181 * Number of tunnels this peers participates in
183 unsigned int ntunnels;
188 * Data scheduled to transmit (to local client or remote peer)
195 struct MeshQueue *next;
196 struct MeshQueue *prev;
199 * Target of the data (NULL if target is client)
201 struct MeshPeerInfo *peer;
204 * Client to send the data to (NULL if target is peer)
206 struct MeshClient *client;
209 * Size of the message to transmit
214 * How old is the data?
216 struct GNUNET_TIME_Absolute timestamp;
221 struct GNUNET_MessageHeader *data;
225 * Globally unique tunnel identification (owner + number)
226 * DO NOT USE OVER THE NETWORK
231 * Node that owns the tunnel
236 * Tunnel number to differentiate all the tunnels owned by the node oid
237 * ( tid < GNUNET_MESH_LOCAL_TUNNEL_ID_CLI )
239 MESH_TunnelNumber tid;
243 struct MeshClient; /* FWD declaration */
246 * Struct containing all information regarding a tunnel
247 * For an intermediate node the improtant info used will be:
248 * - id Tunnel unique identification
249 * - paths[0] To know where to send it next
250 * - metainfo: ready, speeds, accounting
257 struct MESH_TunnelID id;
260 * Local tunnel number ( >= GNUNET_MESH_LOCAL_TUNNEL_ID_CLI or 0 )
262 MESH_TunnelNumber local_tid;
265 * Last time the tunnel was used
267 struct GNUNET_TIME_Absolute timestamp;
270 * Peers in the tunnel, indexed by PeerIdentity -> (MeshPeerInfo)
271 * containing peers added by id or by type, not intermediate peers.
273 struct GNUNET_CONTAINER_MultiHashMap *peers;
276 * Number of peers that are connected and potentially ready to receive data
278 unsigned int peers_ready;
281 * Number of peers that have been added to the tunnel
283 unsigned int peers_total;
286 * Client owner of the tunnel, if any
288 struct MeshClient *client;
291 * Messages ready to transmit
293 struct MeshQueue *queue_head;
294 struct MeshQueue *queue_tail;
299 struct MeshTunnelTree *tree;
302 * Application type we are looking for in this tunnel
304 GNUNET_MESH_ApplicationType type;
307 * Used to search peers offering a service
309 struct GNUNET_DHT_GetHandle *dht_get_type;
312 * Task to keep the used paths alive
314 GNUNET_SCHEDULER_TaskIdentifier path_refresh_task;
317 * Task to destroy the tunnel after timeout
319 * FIXME: merge the two? a tunnel will have either
320 * a path refresh OR a timeout, never both!
322 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
327 * Info needed to work with tunnel paths and peers
334 struct MeshTunnel *t;
337 * Neighbouring peer to whom we send the packet to
339 struct MeshPeerInfo *peer;
344 struct MeshPeerPath *path;
347 * Position in peer's transmit queue
354 * Struct containing information about a client of the service
361 struct MeshClient *next;
362 struct MeshClient *prev;
365 * Tunnels that belong to this client, indexed by local id
367 struct GNUNET_CONTAINER_MultiHashMap *tunnels;
370 * Handle to communicate with the client
372 struct GNUNET_SERVER_Client *handle;
375 * Applications that this client has claimed to provide
377 struct GNUNET_CONTAINER_MultiHashMap *apps;
380 * Messages that this client has declared interest in
382 struct GNUNET_CONTAINER_MultiHashMap *types;
386 * ID of the client, for debug messages
395 /******************************************************************************/
396 /************************ DEBUG FUNCTIONS ****************************/
397 /******************************************************************************/
401 * GNUNET_SCHEDULER_Task for printing a message after some operation is done
402 * @param cls string to print
403 * @param tc task context
406 mesh_debug (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
410 if (GNUNET_SCHEDULER_REASON_SHUTDOWN == tc->reason)
414 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: %s\n", s);
418 /******************************************************************************/
419 /*********************** GLOBAL VARIABLES ****************************/
420 /******************************************************************************/
425 static struct MeshClient *clients;
426 static struct MeshClient *clients_tail;
429 * Tunnels known, indexed by MESH_TunnelID (MeshTunnel)
431 static struct GNUNET_CONTAINER_MultiHashMap *tunnels;
434 * Tunnels incoming, indexed by MESH_TunnelNumber
435 * (which is greater than GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
437 static struct GNUNET_CONTAINER_MultiHashMap *incoming_tunnels;
440 * Peers known, indexed by PeerIdentity (MeshPeerInfo)
442 static struct GNUNET_CONTAINER_MultiHashMap *peers;
445 * Handle to communicate with core
447 static struct GNUNET_CORE_Handle *core_handle;
450 * Handle to communicate with transport
452 // static struct GNUNET_TRANSPORT_Handle *transport_handle;
457 static struct GNUNET_DHT_Handle *dht_handle;
462 static struct GNUNET_SERVER_Handle *server_handle;
465 * Notification context, to send messages to local clients
467 static struct GNUNET_SERVER_NotificationContext *nc;
470 * Local peer own ID (memory efficient handle)
472 static GNUNET_PEER_Id myid;
475 * Local peer own ID (full value)
477 static struct GNUNET_PeerIdentity my_full_id;
482 static struct GNUNET_CRYPTO_RsaPrivateKey *my_private_key;
487 static struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded my_public_key;
490 * Tunnel ID for the next created tunnel (global tunnel number)
492 static MESH_TunnelNumber next_tid;
495 * Tunnel ID for the next incoming tunnel (local tunnel number)
497 static MESH_TunnelNumber next_local_tid;
500 * All application types provided by this peer
502 static struct GNUNET_CONTAINER_MultiHashMap *applications;
505 * All message types clients of this peer are interested in
507 static struct GNUNET_CONTAINER_MultiHashMap *types;
510 * Task to periodically announce provided applications
512 GNUNET_SCHEDULER_TaskIdentifier announce_applications_task;
515 * Task to periodically announce itself in the network
517 GNUNET_SCHEDULER_TaskIdentifier announce_id_task;
520 unsigned int next_client_id;
524 /******************************************************************************/
525 /************************ ITERATORS ****************************/
526 /******************************************************************************/
528 /* FIXME move iterators here */
531 /******************************************************************************/
532 /************************ PERIODIC FUNCTIONS ****************************/
533 /******************************************************************************/
536 * Announce iterator over for each application provided by the peer
539 * @param key current key code
540 * @param value value in the hash map
541 * @return GNUNET_YES if we should continue to
546 announce_application (void *cls, const GNUNET_HashCode * key, void *value)
548 /* FIXME are hashes in multihash map equal on all aquitectures? */
549 GNUNET_DHT_put (dht_handle, key, 10U,
550 GNUNET_DHT_RO_RECORD_ROUTE |
551 GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE, GNUNET_BLOCK_TYPE_TEST,
552 sizeof (struct GNUNET_PeerIdentity),
553 (const char *) &my_full_id,
555 GNUNET_TIME_UNIT_FOREVER_ABS, GNUNET_TIME_UNIT_FOREVER_REL,
556 &mesh_debug, "DHT_put for app completed");
558 GNUNET_TIME_absolute_add (GNUNET_TIME_absolute_get (),
560 APP_ANNOUNCE_TIME, NULL, NULL);
567 * Periodically announce what applications are provided by local clients
570 * @param tc task context
573 announce_applications (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
575 if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN)
577 announce_applications_task = GNUNET_SCHEDULER_NO_TASK;
581 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Starting PUT for apps\n");
583 GNUNET_CONTAINER_multihashmap_iterate (applications, &announce_application,
585 announce_applications_task =
586 GNUNET_SCHEDULER_add_delayed (APP_ANNOUNCE_TIME, &announce_applications,
589 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Finished PUT for apps\n");
596 * Periodically announce self id in the DHT
599 * @param tc task context
602 announce_id (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
604 if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN)
606 announce_id_task = GNUNET_SCHEDULER_NO_TASK;
610 * - Set data expiration in function of X
614 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: DHT_put for ID %s started.\n",
615 GNUNET_i2s (&my_full_id));
617 GNUNET_DHT_put (dht_handle, /* DHT handle */
618 &my_full_id.hashPubKey, /* Key to use */
619 10U, /* Replication level */
620 GNUNET_DHT_RO_RECORD_ROUTE | GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE, /* DHT options */
621 GNUNET_BLOCK_TYPE_TEST, /* Block type */
622 sizeof (my_full_id), /* Size of the data */
623 (char *) &my_full_id, /* Data itself */
624 GNUNET_TIME_absolute_get_forever (), /* Data expiration */
625 GNUNET_TIME_UNIT_FOREVER_REL, /* Retry time */
627 &mesh_debug, "DHT_put for id completed");
629 NULL, /* Continuation */
630 NULL); /* Continuation closure */
633 GNUNET_SCHEDULER_add_delayed (ID_ANNOUNCE_TIME, &announce_id, cls);
638 * Function to process paths received for a new peer addition. The recorded
639 * paths form the initial tunnel, which can be optimized later.
640 * Called on each result obtained for the DHT search.
643 * @param exp when will this value expire
644 * @param key key of the result
645 * @param type type of the result
646 * @param size number of bytes in data
647 * @param data pointer to the result data
650 dht_get_id_handler (void *cls, struct GNUNET_TIME_Absolute exp,
651 const GNUNET_HashCode * key,
652 const struct GNUNET_PeerIdentity *get_path,
653 unsigned int get_path_length,
654 const struct GNUNET_PeerIdentity *put_path,
655 unsigned int put_path_length, enum GNUNET_BLOCK_Type type,
656 size_t size, const void *data);
659 /******************************************************************************/
660 /****************** GENERAL HELPER FUNCTIONS ************************/
661 /******************************************************************************/
664 * Check if client has registered with the service and has not disconnected
666 * @param client the client to check
668 * @return non-NULL if client exists in the global DLL
670 static struct MeshClient *
671 client_get (struct GNUNET_SERVER_Client *client)
673 struct MeshClient *c;
678 if (c->handle == client)
687 * Checks if a given client has subscribed to certain message type
689 * @param message_type Type of message to check
690 * @param c Client to check
692 * @return GNUNET_YES or GNUNET_NO, depending on subscription status
697 client_is_subscribed (uint16_t message_type, struct MeshClient *c)
701 GNUNET_CRYPTO_hash (&message_type, sizeof (uint16_t), &hc);
702 return GNUNET_CONTAINER_multihashmap_contains (c->types, &hc);
707 * Allow a client to send more data after transmitting a multicast message
708 * which some neighbor has not yet accepted altough a reasonable time has
711 * @param cls Closure (DataDescriptor containing the task identifier)
712 * @param tc Task Context
715 client_allow_send (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
717 struct MeshDataDescriptor *info = cls;
719 if (GNUNET_SCHEDULER_REASON_SHUTDOWN == tc->reason)
722 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
723 "MESH: CLIENT ALLOW SEND DESPITE %u COPIES PENDING\n",
726 *(info->timeout_task) = GNUNET_SCHEDULER_NO_TASK;
727 GNUNET_SERVER_receive_done (info->client, GNUNET_OK);
732 * Search for a tunnel by global ID using full PeerIdentities
734 * @param oid owner of the tunnel
735 * @param tid global tunnel number
737 * @return tunnel handler, NULL if doesn't exist
739 static struct MeshTunnel *
740 tunnel_get (struct GNUNET_PeerIdentity *oid, MESH_TunnelNumber tid);
744 * Notify a tunnel that a connection has broken that affects at least
747 * @param t Tunnel affected.
748 * @param p1 Peer that got disconnected from p2.
749 * @param p2 Peer that got disconnected from p1.
751 * @return Short ID of the peer disconnected (either p1 or p2).
752 * 0 if the tunnel remained unaffected.
754 static GNUNET_PEER_Id
755 tunnel_notify_connection_broken (struct MeshTunnel *t, GNUNET_PEER_Id p1,
760 * Send the message to all clients that have subscribed to its type
762 * @param msg Pointer to the message itself
763 * @return number of clients this message was sent to
766 send_subscribed_clients (const struct GNUNET_MessageHeader *msg,
767 const struct GNUNET_MessageHeader *payload)
769 struct GNUNET_PeerIdentity *oid;
770 struct MeshClient *c;
771 struct MeshTunnel *t;
772 MESH_TunnelNumber *tid;
775 char cbuf[htons (msg->size)];
777 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Sending to clients...\n");
778 type = ntohs (payload->type);
779 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: message of type %u\n", type);
781 memcpy (cbuf, msg, sizeof (cbuf));
782 switch (htons (msg->type))
784 struct GNUNET_MESH_Unicast *uc;
785 struct GNUNET_MESH_Multicast *mc;
786 struct GNUNET_MESH_ToOrigin *to;
788 case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
789 uc = (struct GNUNET_MESH_Unicast *) cbuf;
793 case GNUNET_MESSAGE_TYPE_MESH_MULTICAST:
794 mc = (struct GNUNET_MESH_Multicast *) cbuf;
798 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
799 to = (struct GNUNET_MESH_ToOrigin *) cbuf;
807 t = tunnel_get (oid, ntohl (*tid));
813 *tid = htonl (t->local_tid);
814 for (count = 0, c = clients; c != NULL; c = c->next)
816 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: client %u\n", c->id);
817 if (client_is_subscribed (type, c))
820 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: sending\n");
821 GNUNET_SERVER_notification_context_unicast (nc, c->handle,
822 (struct GNUNET_MessageHeader
823 *) cbuf, GNUNET_YES);
831 * Notify the client that owns the tunnel that a peer has connected to it
832 * (the requested path to it has been confirmed).
834 * @param t Tunnel whose owner to notify
835 * @param id Short id of the peer that has connected
838 send_client_peer_connected (const struct MeshTunnel *t, const GNUNET_PEER_Id id)
840 struct GNUNET_MESH_PeerControl pc;
842 pc.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD);
843 pc.header.size = htons (sizeof (struct GNUNET_MESH_PeerControl));
844 pc.tunnel_id = htonl (t->local_tid);
845 GNUNET_PEER_resolve (id, &pc.peer);
846 GNUNET_SERVER_notification_context_unicast (nc, t->client->handle, &pc.header,
852 * Notify all clients (not depending on registration status) that the incoming
853 * tunnel is no longer valid.
855 * @param t Tunnel that was destroyed.
858 send_clients_tunnel_destroy (struct MeshTunnel *t)
860 struct GNUNET_MESH_TunnelMessage msg;
862 msg.header.size = htons (sizeof (msg));
863 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY);
864 msg.tunnel_id = htonl (t->local_tid);
865 GNUNET_SERVER_notification_context_broadcast (nc, &msg.header, GNUNET_NO);
870 * Function called to notify a client about the socket
871 * being ready to queue more data. "buf" will be
872 * NULL and "size" zero if the socket was closed for
873 * writing in the meantime.
876 * @param size number of bytes available in buf
877 * @param buf where the callee should write the message
878 * @return number of bytes written to buf
881 send_core_create_path (void *cls, size_t size, void *buf);
885 * Function called to notify a client about the socket
886 * being ready to queue more data. "buf" will be
887 * NULL and "size" zero if the socket was closed for
888 * writing in the meantime.
890 * @param cls closure (data itself)
891 * @param size number of bytes available in buf
892 * @param buf where the callee should write the message
894 * @return number of bytes written to buf
897 send_core_data_multicast (void *cls, size_t size, void *buf);
901 * Decrements the reference counter and frees all resources if needed
903 * @param dd Data Descriptor used in a multicast message
906 data_descriptor_decrement_multicast (struct MeshDataDescriptor *dd)
908 if (0 == --(*(dd->copies)))
910 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Last copy!\n");
911 if (NULL != dd->client)
913 if (GNUNET_SCHEDULER_NO_TASK != *(dd->timeout_task))
915 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
916 "MESH: cancelling client timeout (%u)...\n",
917 *(dd->timeout_task));
918 GNUNET_SCHEDULER_cancel (*(dd->timeout_task));
919 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: notifying client...\n");
920 GNUNET_SERVER_receive_done (dd->client, GNUNET_OK);
922 GNUNET_free (dd->timeout_task);
924 GNUNET_free (dd->copies);
925 GNUNET_free (dd->data);
931 * Cancel a core transmission that was already requested and free all resources
932 * associated to the request.
934 * @param peer PeeInfo of the peer whose transmission is cancelled.
935 * @param i Position of the transmission to be cancelled.
938 peer_info_cancel_transmission (struct MeshPeerInfo *peer, unsigned int i)
940 if (NULL != peer->core_transmit[i])
942 struct MeshDataDescriptor *dd;
943 struct MeshPathInfo *path_info;
947 struct GNUNET_PeerIdentity id;
949 GNUNET_PEER_resolve (peer->id, &id);
950 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
951 "MESH: Cancelling data transmission at %s [%u]\n",
952 GNUNET_i2s (&id), i);
953 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: message type %u\n",
957 /* TODO: notify that tranmission has failed */
958 switch (peer->types[i])
960 case GNUNET_MESSAGE_TYPE_MESH_MULTICAST:
961 case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
962 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
963 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: type payload\n");
965 data_descriptor_decrement_multicast (dd);
967 case GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE:
968 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: type create path\n");
969 path_info = peer->infos[i];
970 path_destroy (path_info->path);
974 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: type unknown!\n");
976 GNUNET_CORE_notify_transmit_ready_cancel (peer->core_transmit[i]);
977 peer->core_transmit[i] = NULL;
978 GNUNET_free (peer->infos[i]);
984 * Get a unused CORE slot to transmit a message to a peer. If all the slots
985 * are used, cancel one and return it's position.
987 * @param peer PeerInfo of the neighbor we want to transmit to.
989 * @return The index of an available slot to transmit to the neighbor.
992 peer_info_transmit_slot (struct MeshPeerInfo *peer)
996 for (i = 0; peer->core_transmit[i]; i++)
998 if (i == (CORE_QUEUE_SIZE - 1))
1000 /* All positions are taken! Overwriting! */
1002 peer_info_cancel_transmission (peer, 0);
1011 * Retrieve the MeshPeerInfo stucture associated with the peer, create one
1012 * and insert it in the appropiate structures if the peer is not known yet.
1014 * @param peer Full identity of the peer.
1016 * @return Existing or newly created peer info.
1018 static struct MeshPeerInfo *
1019 peer_info_get (const struct GNUNET_PeerIdentity *peer)
1021 struct MeshPeerInfo *peer_info;
1023 peer_info = GNUNET_CONTAINER_multihashmap_get (peers, &peer->hashPubKey);
1024 if (NULL == peer_info)
1027 (struct MeshPeerInfo *) GNUNET_malloc (sizeof (struct MeshPeerInfo));
1028 GNUNET_CONTAINER_multihashmap_put (peers, &peer->hashPubKey, peer_info,
1029 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
1030 peer_info->id = GNUNET_PEER_intern (peer);
1038 * Retrieve the MeshPeerInfo stucture associated with the peer, create one
1039 * and insert it in the appropiate structures if the peer is not known yet.
1041 * @param peer Short identity of the peer.
1043 * @return Existing or newly created peer info.
1045 static struct MeshPeerInfo *
1046 peer_info_get_short (const GNUNET_PEER_Id peer)
1048 struct GNUNET_PeerIdentity id;
1050 GNUNET_PEER_resolve (peer, &id);
1051 return peer_info_get (&id);
1056 * Iterator to remove the tunnel from the list of tunnels a peer participates
1059 * @param cls Closure (tunnel info)
1060 * @param key GNUNET_PeerIdentity of the peer (unused)
1061 * @param value PeerInfo of the peer
1063 * @return always GNUNET_YES, to keep iterating
1066 peer_info_delete_tunnel (void *cls, const GNUNET_HashCode * key, void *value)
1068 struct MeshTunnel *t = cls;
1069 struct MeshPeerInfo *peer = value;
1072 for (i = 0; i < peer->ntunnels; i++)
1075 memcmp (&peer->tunnels[i]->id, &t->id, sizeof (struct MESH_TunnelID)))
1078 peer->tunnels[i] = peer->tunnels[peer->ntunnels];
1079 peer->tunnels = GNUNET_realloc (peer->tunnels, peer->ntunnels);
1088 * Core callback to write a
1090 * @param cls Closure (MeshDataDescriptor with data in "data" member).
1091 * @param size Number of bytes available in buf.
1092 * @param buf Where the to write the message.
1094 * @return number of bytes written to buf
1097 send_core_data_raw (void *cls, size_t size, void *buf)
1099 struct MeshDataDescriptor *info = cls;
1100 struct GNUNET_MessageHeader *msg;
1103 GNUNET_assert (NULL != info);
1104 GNUNET_assert (NULL != info->data);
1105 msg = (struct GNUNET_MessageHeader *) info->data;
1106 total_size = ntohs (msg->size);
1108 if (total_size > size)
1110 struct GNUNET_PeerIdentity id;
1112 GNUNET_PEER_resolve (info->peer->id, &id);
1113 info->peer->core_transmit[info->handler_n] =
1114 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 100,
1115 GNUNET_TIME_UNIT_FOREVER_REL, &id,
1116 size, &send_core_data_raw, info);
1119 info->peer->core_transmit[info->handler_n] = NULL;
1120 memcpy (buf, msg, total_size);
1121 GNUNET_free (info->data);
1128 * Sends an already built message to a peer, properly registrating
1129 * all used resources.
1131 * @param message Message to send. Fucntion makes a copy of it.
1132 * @param peer Short ID of the neighbor whom to send the message.
1135 send_message (const struct GNUNET_MessageHeader *message,
1136 const struct GNUNET_PeerIdentity *peer)
1138 struct MeshDataDescriptor *info;
1139 struct MeshPeerInfo *neighbor;
1140 struct MeshPeerPath *p;
1144 // GNUNET_TRANSPORT_try_connect();
1146 size = ntohs (message->size);
1147 info = GNUNET_malloc (sizeof (struct MeshDataDescriptor));
1148 info->data = GNUNET_malloc (size);
1149 memcpy (info->data, message, size);
1150 neighbor = peer_info_get (peer);
1151 for (p = neighbor->path_head; NULL != p; p = p->next)
1163 i = peer_info_transmit_slot (neighbor);
1164 info->handler_n = i;
1165 info->peer = neighbor;
1166 neighbor->types[i] = GNUNET_MESSAGE_TYPE_MESH_UNICAST;
1167 neighbor->infos[i] = info;
1168 neighbor->core_transmit[i] =
1169 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 100,
1170 GNUNET_TIME_UNIT_FOREVER_REL, peer,
1171 size, &send_core_data_raw, info);
1177 * Sends a CREATE PATH message for a path to a peer, properly registrating
1178 * all used resources.
1180 * @param peer PeerInfo of the final peer for whom this path is being created.
1181 * @param p Path itself.
1182 * @param t Tunnel for which the path is created.
1185 send_create_path (struct MeshPeerInfo *peer, struct MeshPeerPath *p,
1186 struct MeshTunnel *t)
1188 struct GNUNET_PeerIdentity id;
1189 struct MeshPathInfo *path_info;
1190 struct MeshPeerInfo *neighbor;
1195 p = tree_get_path_to_peer (t->tree, peer->id);
1202 for (i = 0; i < p->length; i++)
1204 if (p->peers[i] == myid)
1207 if (i >= p->length - 1)
1213 GNUNET_PEER_resolve (p->peers[i + 1], &id);
1215 path_info = GNUNET_malloc (sizeof (struct MeshPathInfo));
1216 path_info->path = p;
1218 neighbor = peer_info_get (&id);
1219 path_info->peer = neighbor;
1220 path_info->pos = peer_info_transmit_slot (neighbor);
1221 neighbor->types[path_info->pos] = GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE;
1222 neighbor->infos[path_info->pos] = path_info;
1223 neighbor->core_transmit[path_info->pos] = GNUNET_CORE_notify_transmit_ready (core_handle, /* handle */
1226 GNUNET_TIME_UNIT_FOREVER_REL, /* timeout */
1228 sizeof (struct GNUNET_MESH_ManipulatePath) + (p->length * sizeof (struct GNUNET_PeerIdentity)), /*size */
1229 &send_core_create_path, /* callback */
1230 path_info); /* cls */
1235 * Sends a DESTROY PATH message to free resources for a path in a tunnel
1237 * @param t Tunnel whose path to destroy.
1238 * @param destination Short ID of the peer to whom the path to destroy.
1241 send_destroy_path (struct MeshTunnel *t, GNUNET_PEER_Id destination)
1243 struct MeshPeerPath *p;
1246 p = tree_get_path_to_peer (t->tree, destination);
1252 size = sizeof (struct GNUNET_MESH_ManipulatePath);
1253 size += p->length * sizeof (struct GNUNET_PeerIdentity);
1255 struct GNUNET_MESH_ManipulatePath *msg;
1256 struct GNUNET_PeerIdentity *pi;
1260 msg = (struct GNUNET_MESH_ManipulatePath *) cbuf;
1261 msg->header.size = htons (size);
1262 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_DESTROY);
1263 msg->tid = htonl (t->id.tid);
1264 pi = (struct GNUNET_PeerIdentity *) &msg[1];
1265 for (i = 0; i < p->length; i++)
1267 GNUNET_PEER_resolve (p->peers[i], &pi[i]);
1269 send_message (&msg->header, path_get_first_hop (t->tree, destination));
1276 * Try to establish a new connection to this peer.
1277 * Use the best path for the given tunnel.
1278 * If the peer doesn't have any path to it yet, try to get one.
1279 * If the peer already has some path, send a CREATE PATH towards it.
1281 * @param peer PeerInfo of the peer.
1282 * @param t Tunnel for which to create the path, if possible.
1285 peer_info_connect (struct MeshPeerInfo *peer, struct MeshTunnel *t)
1287 struct MeshPeerPath *p;
1288 struct MeshPathInfo *path_info;
1290 if (NULL != peer->path_head)
1292 p = tree_get_path_to_peer (t->tree, peer->id);
1301 send_create_path (peer, p, t);
1306 send_client_peer_connected (t, myid);
1309 else if (NULL == peer->dhtget)
1311 struct GNUNET_PeerIdentity id;
1313 GNUNET_PEER_resolve (peer->id, &id);
1314 path_info = GNUNET_malloc (sizeof (struct MeshPathInfo));
1315 path_info->peer = peer;
1317 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1318 "MESH: Starting DHT GET for peer %s\n", GNUNET_i2s (&id));
1319 peer->dhtgetcls = path_info;
1320 peer->dhtget = GNUNET_DHT_get_start (dht_handle, /* handle */
1321 GNUNET_TIME_UNIT_FOREVER_REL, /* timeout */
1322 GNUNET_BLOCK_TYPE_TEST, /* type */
1323 &id.hashPubKey, /* key to search */
1324 4, /* replication level */
1325 GNUNET_DHT_RO_RECORD_ROUTE | GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE, NULL, /* xquery */
1326 0, /* xquery bits */
1327 &dht_get_id_handler, path_info);
1329 /* Otherwise, there is no path but the DHT get is already started. */
1334 * Task to delay the connection of a peer
1336 * @param cls Closure (path info with tunnel and peer to connect).
1337 * Will be free'd on exection.
1338 * @param tc TaskContext
1341 peer_info_connect_task (void *cls,
1342 const struct GNUNET_SCHEDULER_TaskContext *tc)
1344 struct MeshPathInfo *path_info = cls;
1346 if (0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
1351 peer_info_connect (path_info->peer, path_info->t);
1357 * Destroy the peer_info and free any allocated resources linked to it
1359 * @param pi The peer_info to destroy.
1361 * @return GNUNET_OK on success
1364 peer_info_destroy (struct MeshPeerInfo *pi)
1366 struct GNUNET_PeerIdentity id;
1367 struct MeshPeerPath *p;
1368 struct MeshPeerPath *nextp;
1371 GNUNET_PEER_resolve (pi->id, &id);
1372 GNUNET_PEER_change_rc (pi->id, -1);
1375 GNUNET_CONTAINER_multihashmap_remove (peers, &id.hashPubKey, pi))
1378 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1379 "MESH: removing peer %s, not in hashmap\n", GNUNET_i2s (&id));
1381 if (NULL != pi->dhtget)
1383 GNUNET_DHT_get_stop (pi->dhtget);
1384 GNUNET_free (pi->dhtgetcls);
1386 for (i = 0; i < CORE_QUEUE_SIZE; i++)
1388 peer_info_cancel_transmission (pi, i);
1394 GNUNET_CONTAINER_DLL_remove (pi->path_head, pi->path_tail, p);
1404 * Remove all paths that rely on a direct connection between p1 and p2
1405 * from the peer itself and notify all tunnels about it.
1407 * @param peer PeerInfo of affected peer.
1408 * @param p1 GNUNET_PEER_Id of one peer.
1409 * @param p2 GNUNET_PEER_Id of another peer that was connected to the first and
1412 * TODO: optimize (see below)
1415 peer_info_remove_path (struct MeshPeerInfo *peer, GNUNET_PEER_Id p1,
1418 struct MeshPeerPath *p;
1419 struct MeshPeerPath *aux;
1420 struct MeshPeerInfo *peer_d;
1422 unsigned int destroyed;
1428 p = peer->path_head;
1432 for (i = 0; i < (p->length - 1); i++)
1434 if ((p->peers[i] == p1 && p->peers[i + 1] == p2) ||
1435 (p->peers[i] == p2 && p->peers[i + 1] == p1))
1437 GNUNET_CONTAINER_DLL_remove (peer->path_head, peer->path_tail, p);
1448 for (i = 0; i < peer->ntunnels; i++)
1450 d = tunnel_notify_connection_broken (peer->tunnels[i], p1, p2);
1452 * Problem: one or more peers have been deleted from the tunnel tree.
1453 * We don't know who they are to try to add them again.
1454 * We need to try to find a new path for each of the disconnected peers.
1455 * Some of them might already have a path to reach them that does not
1456 * involve p1 and p2. Adding all anew might render in a better tree than
1457 * the trivial immediate fix.
1459 * Trivial immiediate fix: try to reconnect to the disconnected node. All
1460 * its children will be reachable trough him.
1462 peer_d = peer_info_get_short (d);
1465 for (p = peer_d->path_head; NULL != p; p = p->next)
1467 if ((cost = path_get_cost (peer->tunnels[i]->tree, p)) < best)
1475 /* No callback, as peer will be already disconnected */
1476 tree_add_path (peer->tunnels[i]->tree, aux, NULL, NULL);
1480 peer_info_connect (peer_d, peer->tunnels[i]);
1487 * Add the path to the peer and update the path used to reach it in case this
1490 * @param peer_info Destination peer to add the path to.
1491 * @param path New path to add. Last peer must be the peer in arg 1.
1492 * Path will be either used of freed if already known.
1493 * @param trusted Do we trust that this path is real?
1496 peer_info_add_path (struct MeshPeerInfo *peer_info, struct MeshPeerPath *path,
1499 struct MeshPeerPath *aux;
1503 if ((NULL == peer_info) || (NULL == path))
1506 path_destroy (path);
1509 if (path->length <= 2 && GNUNET_NO == trusted)
1511 /* Only allow CORE to tell us about direct paths */
1512 path_destroy (path);
1515 GNUNET_assert (peer_info->id == path->peers[path->length - 1]);
1516 for (l = 1; l < path->length; l++)
1518 if (path->peers[l] == myid)
1520 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: shortening path by %u\n", l);
1521 for (l2 = 0; l2 < path->length - l - 1; l2++)
1523 path->peers[l2] = path->peers[l + l2];
1528 GNUNET_realloc (path->peers, path->length * sizeof (GNUNET_PEER_Id));
1533 struct GNUNET_PeerIdentity id;
1535 GNUNET_PEER_resolve (peer_info->id, &id);
1536 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: adding path [%u] to peer %s\n",
1537 path->length, GNUNET_i2s (&id));
1540 l = path_get_length (path);
1547 GNUNET_assert (peer_info->id == path->peers[path->length - 1]);
1548 for (aux = peer_info->path_head; aux != NULL; aux = aux->next)
1550 l2 = path_get_length (aux);
1553 GNUNET_CONTAINER_DLL_insert_before (peer_info->path_head,
1554 peer_info->path_tail, aux, path);
1559 if (l2 == l && memcmp (path->peers, aux->peers, l) == 0)
1561 path_destroy (path);
1566 GNUNET_CONTAINER_DLL_insert_tail (peer_info->path_head, peer_info->path_tail,
1573 * Add the path to the origin peer and update the path used to reach it in case
1574 * this is the shortest.
1575 * The path is given in peer_info -> destination, therefore we turn the path
1576 * upside down first.
1578 * @param peer_info Peer to add the path to, being the origin of the path.
1579 * @param path New path to add after being inversed.
1580 * @param trusted Do we trust that this path is real?
1583 peer_info_add_path_to_origin (struct MeshPeerInfo *peer_info,
1584 struct MeshPeerPath *path, int trusted)
1587 peer_info_add_path (peer_info, path, trusted);
1592 * Build a PeerPath from the paths returned from the DHT, reversing the paths
1593 * to obtain a local peer -> destination path and interning the peer ids.
1595 * @return Newly allocated and created path
1597 static struct MeshPeerPath *
1598 path_build_from_dht (const struct GNUNET_PeerIdentity *get_path,
1599 unsigned int get_path_length,
1600 const struct GNUNET_PeerIdentity *put_path,
1601 unsigned int put_path_length)
1603 struct MeshPeerPath *p;
1609 GNUNET_PEER_change_rc (myid, 1);
1610 i = get_path_length;
1611 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: GET has %d hops.\n", i);
1612 for (i--; i >= 0; i--)
1614 id = GNUNET_PEER_intern (&get_path[i]);
1615 if (p->length > 0 && id == p->peers[p->length - 1])
1617 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Optimizing 1 hop out.\n");
1618 GNUNET_PEER_change_rc (id, -1);
1622 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Adding from GET: %s.\n",
1623 GNUNET_i2s (&get_path[i]));
1625 p->peers = GNUNET_realloc (p->peers, sizeof (GNUNET_PEER_Id) * p->length);
1626 p->peers[p->length - 1] = id;
1629 i = put_path_length;
1630 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: PUT has %d hops.\n", i);
1631 for (i--; i >= 0; i--)
1633 id = GNUNET_PEER_intern (&put_path[i]);
1636 /* PUT path went through us, so discard the path up until now and start
1637 * from here to get a much shorter (and loop-free) path.
1642 if (p->length > 0 && id == p->peers[p->length - 1])
1644 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Optimizing 1 hop out.\n");
1645 GNUNET_PEER_change_rc (id, -1);
1649 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Adding from PUT: %s.\n",
1650 GNUNET_i2s (&put_path[i]));
1652 p->peers = GNUNET_realloc (p->peers, sizeof (GNUNET_PEER_Id) * p->length);
1653 p->peers[p->length - 1] = id;
1657 if (get_path_length > 0)
1658 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: (first of GET: %s)\n",
1659 GNUNET_i2s (&get_path[0]));
1660 if (put_path_length > 0)
1661 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: (first of PUT: %s)\n",
1662 GNUNET_i2s (&put_path[0]));
1663 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: In total: %d hops\n",
1665 for (i = 0; i < p->length; i++)
1667 struct GNUNET_PeerIdentity peer_id;
1669 GNUNET_PEER_resolve (p->peers[i], &peer_id);
1670 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: %u: %s\n", p->peers[i],
1671 GNUNET_i2s (&peer_id));
1679 * Send keepalive packets for a peer
1681 * @param cls Closure (tunnel for which to send the keepalive).
1682 * @param tc Notification context.
1684 * TODO: implement explicit multicast keepalive?
1687 path_refresh (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
1691 * Search for a tunnel among the incoming tunnels
1693 * @param tid the local id of the tunnel
1695 * @return tunnel handler, NULL if doesn't exist
1697 static struct MeshTunnel *
1698 tunnel_get_incoming (MESH_TunnelNumber tid)
1700 GNUNET_HashCode hash;
1702 GNUNET_assert (tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV);
1703 GNUNET_CRYPTO_hash (&tid, sizeof (MESH_TunnelNumber), &hash);
1704 return GNUNET_CONTAINER_multihashmap_get (incoming_tunnels, &hash);
1709 * Search for a tunnel among the tunnels for a client
1711 * @param c the client whose tunnels to search in
1712 * @param tid the local id of the tunnel
1714 * @return tunnel handler, NULL if doesn't exist
1716 static struct MeshTunnel *
1717 tunnel_get_by_local_id (struct MeshClient *c, MESH_TunnelNumber tid)
1719 if (tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
1721 return tunnel_get_incoming (tid);
1725 GNUNET_HashCode hash;
1727 GNUNET_CRYPTO_hash (&tid, sizeof (MESH_TunnelNumber), &hash);
1728 return GNUNET_CONTAINER_multihashmap_get (c->tunnels, &hash);
1734 * Search for a tunnel by global ID using PEER_ID
1736 * @param pi owner of the tunnel
1737 * @param tid global tunnel number
1739 * @return tunnel handler, NULL if doesn't exist
1741 static struct MeshTunnel *
1742 tunnel_get_by_pi (GNUNET_PEER_Id pi, MESH_TunnelNumber tid)
1744 struct MESH_TunnelID id;
1745 GNUNET_HashCode hash;
1750 GNUNET_CRYPTO_hash (&id, sizeof (struct MESH_TunnelID), &hash);
1751 return GNUNET_CONTAINER_multihashmap_get (tunnels, &hash);
1756 * Search for a tunnel by global ID using full PeerIdentities
1758 * @param oid owner of the tunnel
1759 * @param tid global tunnel number
1761 * @return tunnel handler, NULL if doesn't exist
1763 static struct MeshTunnel *
1764 tunnel_get (struct GNUNET_PeerIdentity *oid, MESH_TunnelNumber tid)
1766 return tunnel_get_by_pi (GNUNET_PEER_search (oid), tid);
1771 * Callback used to notify a client owner of a tunnel that a peer has
1772 * disconnected, most likely because of a path change.
1774 * @param cls Closure (tunnel this notification is about).
1775 * @param peer_id Short ID of disconnected peer.
1778 notify_peer_disconnected (void *cls, GNUNET_PEER_Id peer_id)
1780 struct MeshTunnel *t = cls;
1781 struct MeshPeerInfo *peer;
1782 struct MeshPathInfo *path_info;
1784 if (NULL != t->client && NULL != nc)
1786 struct GNUNET_MESH_PeerControl msg;
1788 msg.header.size = htons (sizeof (msg));
1789 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_DEL);
1790 msg.tunnel_id = htonl (t->local_tid);
1791 GNUNET_PEER_resolve (peer_id, &msg.peer);
1792 GNUNET_SERVER_notification_context_unicast (nc, t->client->handle,
1793 &msg.header, GNUNET_NO);
1795 peer = peer_info_get_short (peer_id);
1796 path_info = GNUNET_malloc (sizeof (struct MeshPathInfo));
1797 path_info->peer = peer;
1799 GNUNET_SCHEDULER_add_now (&peer_info_connect_task, path_info);
1804 * Add a peer to a tunnel, accomodating paths accordingly and initializing all
1805 * needed rescources.
1806 * If peer already exists, reevaluate shortest path and change if different.
1808 * @param t Tunnel we want to add a new peer to
1809 * @param peer PeerInfo of the peer being added
1813 tunnel_add_peer (struct MeshTunnel *t, struct MeshPeerInfo *peer)
1815 struct GNUNET_PeerIdentity id;
1816 struct MeshPeerPath *best_p;
1817 struct MeshPeerPath *p;
1818 unsigned int best_cost;
1821 GNUNET_PEER_resolve (peer->id, &id);
1823 GNUNET_CONTAINER_multihashmap_contains (t->peers, &id.hashPubKey))
1826 GNUNET_array_append (peer->tunnels, peer->ntunnels, t);
1827 GNUNET_assert (GNUNET_OK ==
1828 GNUNET_CONTAINER_multihashmap_put (t->peers, &id.hashPubKey,
1830 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST));
1833 if (NULL != (p = peer->path_head))
1836 best_cost = path_get_cost (t->tree, p);
1839 if ((cost = path_get_cost (t->tree, p)) < best_cost)
1846 tree_add_path (t->tree, best_p, ¬ify_peer_disconnected, t);
1847 if (GNUNET_SCHEDULER_NO_TASK == t->path_refresh_task)
1848 t->path_refresh_task =
1849 GNUNET_SCHEDULER_add_delayed (REFRESH_PATH_TIME, &path_refresh, t);
1853 /* Start a DHT get if necessary */
1854 peer_info_connect (peer, t);
1859 * Add a path to a tunnel which we don't own, just to remember the next hop.
1860 * If destination node was already in the tunnel, the first hop information
1861 * will be replaced with the new path.
1863 * @param t Tunnel we want to add a new peer to
1864 * @param p Path to add
1865 * @param own_pos Position of local node in path.
1869 tunnel_add_path (struct MeshTunnel *t, struct MeshPeerPath *p,
1870 unsigned int own_pos)
1872 struct GNUNET_PeerIdentity id;
1874 GNUNET_assert (0 != own_pos);
1875 tree_add_path (t->tree, p, NULL, NULL);
1876 if (tree_get_me (t->tree) == 0)
1877 tree_set_me (t->tree, p->peers[own_pos]);
1878 if (own_pos < p->length - 1)
1880 GNUNET_PEER_resolve (p->peers[own_pos + 1], &id);
1881 tree_update_first_hops (t->tree, tree_get_me (t->tree), &id);
1887 * Notifies a tunnel that a connection has broken that affects at least
1888 * some of its peers. Sends a notification towards the root of the tree.
1889 * In case the peer is the owner of the tree, notifies the client that owns
1890 * the tunnel and tries to reconnect.
1892 * @param t Tunnel affected.
1893 * @param p1 Peer that got disconnected from p2.
1894 * @param p2 Peer that got disconnected from p1.
1896 * @return Short ID of the peer disconnected (either p1 or p2).
1897 * 0 if the tunnel remained unaffected.
1899 static GNUNET_PEER_Id
1900 tunnel_notify_connection_broken (struct MeshTunnel *t, GNUNET_PEER_Id p1,
1906 tree_notify_connection_broken (t->tree, p1, p2, ¬ify_peer_disconnected,
1908 if (myid != p1 && myid != p2)
1914 if (tree_get_predecessor (t->tree) != 0)
1916 /* We are the peer still connected, notify owner of the disconnection. */
1917 struct GNUNET_MESH_PathBroken msg;
1918 struct GNUNET_PeerIdentity neighbor;
1920 msg.header.size = htons (sizeof (msg));
1921 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_BROKEN);
1922 GNUNET_PEER_resolve (t->id.oid, &msg.oid);
1923 msg.tid = htonl (t->id.tid);
1924 msg.peer1 = my_full_id;
1925 GNUNET_PEER_resolve (pid, &msg.peer2);
1926 GNUNET_PEER_resolve (tree_get_predecessor (t->tree), &neighbor);
1927 send_message (&msg.header, &neighbor);
1934 struct MeshMulticastData
1936 struct MeshTunnel *t;
1938 GNUNET_SCHEDULER_TaskIdentifier *task;
1940 unsigned int *reference_counter;
1949 * Send a multicast packet to a neighbor.
1952 tunnel_send_multicast_iterator (void *cls, GNUNET_PEER_Id neighbor_id)
1954 struct MeshMulticastData *mdata = cls;
1955 struct MeshDataDescriptor *info;
1956 struct GNUNET_PeerIdentity neighbor;
1959 info = GNUNET_malloc (sizeof (struct MeshDataDescriptor));
1961 info->data = mdata->data;
1962 info->size = mdata->data_len;
1963 info->copies = mdata->reference_counter;
1964 (*(mdata->reference_counter))++;
1966 if (NULL != mdata->t->client)
1968 info->client = mdata->t->client->handle;
1969 info->timeout_task = mdata->task;
1971 info->destination = neighbor_id;
1972 GNUNET_PEER_resolve (neighbor_id, &neighbor);
1974 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: sending to %s...\n",
1975 GNUNET_i2s (&neighbor));
1977 info->peer = peer_info_get (&neighbor);
1978 GNUNET_assert (NULL != info->peer);
1979 i = peer_info_transmit_slot (info->peer);
1980 info->handler_n = i;
1981 info->peer->infos[i] = info;
1982 info->peer->types[i] = GNUNET_MESSAGE_TYPE_MESH_MULTICAST;
1983 info->peer->core_transmit[i] =
1984 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0,
1985 GNUNET_TIME_UNIT_FOREVER_REL,
1986 &neighbor, info->size,
1987 &send_core_data_multicast, info);
1991 * Send a message in a tunnel in multicast, sending a copy to each child node
1992 * down the local one in the tunnel tree.
1994 * @param t Tunnel in which to send the data.
1995 * @param msg Message to be sent
1998 tunnel_send_multicast (struct MeshTunnel *t,
1999 const struct GNUNET_MessageHeader *msg)
2001 struct MeshMulticastData *mdata;
2004 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2005 "MESH: sending a multicast packet...\n");
2007 GNUNET_assert (tree_get_me (t->tree) != 0);
2008 mdata = GNUNET_malloc (sizeof (struct MeshMulticastData));
2009 mdata->data_len = ntohs (msg->size);
2010 mdata->reference_counter = GNUNET_malloc (sizeof (unsigned int));
2011 mdata->data = GNUNET_malloc (mdata->data_len);
2013 memcpy (mdata->data, msg, mdata->data_len);
2014 if (NULL != t->client)
2016 mdata->task = GNUNET_malloc (sizeof (GNUNET_SCHEDULER_TaskIdentifier));
2018 GNUNET_SCHEDULER_add_delayed (UNACKNOWLEDGED_WAIT, &client_allow_send,
2022 tree_iterate_children (t->tree, &tunnel_send_multicast_iterator, mdata);
2023 if (*(mdata->reference_counter) == 0)
2025 GNUNET_free (mdata->data);
2026 GNUNET_free (mdata->reference_counter);
2027 if (NULL != mdata->task)
2029 GNUNET_free (mdata->task);
2032 GNUNET_free (mdata);
2034 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2035 "MESH: sending a multicast packet done\n");
2042 * Send a message to all peers in this tunnel that the tunnel is no longer
2045 * @param t The tunnel whose peers to notify.
2048 tunnel_send_destroy (struct MeshTunnel *t)
2050 struct GNUNET_MESH_TunnelDestroy msg;
2052 msg.header.size = htons (sizeof (msg));
2053 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY);
2054 GNUNET_PEER_resolve (t->id.oid, &msg.oid);
2055 msg.tid = htonl (t->id.tid);
2056 tunnel_send_multicast (t, &msg.header);
2062 * Destroy the tunnel and free any allocated resources linked to it
2064 * @param t the tunnel to destroy
2066 * @return GNUNET_OK on success
2069 tunnel_destroy (struct MeshTunnel *t)
2071 struct MeshClient *c;
2072 struct MeshQueue *q;
2073 struct MeshQueue *qn;
2074 GNUNET_HashCode hash;
2083 struct GNUNET_PeerIdentity id;
2085 GNUNET_PEER_resolve (t->id.oid, &id);
2086 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: destroying tunnel %s [%x]\n",
2087 GNUNET_i2s (&id), t->id.tid);
2089 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: by client %u\n", c->id);
2093 GNUNET_CRYPTO_hash (&t->id, sizeof (struct MESH_TunnelID), &hash);
2094 if (GNUNET_YES != GNUNET_CONTAINER_multihashmap_remove (tunnels, &hash, t))
2099 GNUNET_CRYPTO_hash (&t->local_tid, sizeof (MESH_TunnelNumber), &hash);
2101 GNUNET_YES != GNUNET_CONTAINER_multihashmap_remove (c->tunnels, &hash, t))
2105 if (t->local_tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
2107 GNUNET_CRYPTO_hash (&t->local_tid, sizeof (MESH_TunnelNumber), &hash);
2108 GNUNET_break (GNUNET_YES ==
2109 GNUNET_CONTAINER_multihashmap_remove (incoming_tunnels, &hash,
2112 if (NULL != t->peers)
2114 GNUNET_CONTAINER_multihashmap_iterate (t->peers, &peer_info_delete_tunnel,
2116 GNUNET_CONTAINER_multihashmap_destroy (t->peers);
2121 if (NULL != q->data)
2122 GNUNET_free (q->data);
2126 /* TODO cancel core transmit ready in case it was active */
2128 tree_destroy (t->tree);
2129 if (NULL != t->dht_get_type)
2130 GNUNET_DHT_get_stop (t->dht_get_type);
2131 if (GNUNET_SCHEDULER_NO_TASK != t->timeout_task)
2132 GNUNET_SCHEDULER_cancel (t->timeout_task);
2133 if (GNUNET_SCHEDULER_NO_TASK != t->path_refresh_task)
2134 GNUNET_SCHEDULER_cancel (t->path_refresh_task);
2141 * Removes an explicit path from a tunnel, freeing all intermediate nodes
2142 * that are no longer needed, as well as nodes of no longer reachable peers.
2143 * The tunnel itself is also destoyed if results in a remote empty tunnel.
2145 * @param t Tunnel from which to remove the path.
2146 * @param p Peer which should be removed.
2149 tunnel_delete_peer (struct MeshTunnel *t, GNUNET_PEER_Id peer)
2151 if (GNUNET_NO == tree_del_peer (t->tree, peer, NULL, NULL))
2157 * tunnel_destroy_iterator: iterator for deleting each tunnel that belongs to a
2158 * client when the client disconnects.
2160 * @param cls closure (client that is disconnecting)
2161 * @param key the hash of the local tunnel id (used to access the hashmap)
2162 * @param value the value stored at the key (tunnel to destroy)
2164 * @return GNUNET_OK on success
2167 tunnel_destroy_iterator (void *cls, const GNUNET_HashCode * key, void *value)
2169 struct MeshTunnel *t = value;
2172 r = tunnel_destroy (t);
2178 * Timeout function, destroys tunnel if called
2180 * @param cls Closure (tunnel to destroy).
2181 * @param tc TaskContext
2184 tunnel_timeout (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
2186 struct MeshTunnel *t = cls;
2188 if (GNUNET_SCHEDULER_REASON_SHUTDOWN == tc->reason)
2190 t->timeout_task = GNUNET_SCHEDULER_NO_TASK;
2195 * Resets the tunnel timeout. Starts it if no timeout was running.
2197 * @param t Tunnel whose timeout to reset.
2200 tunnel_reset_timeout (struct MeshTunnel *t)
2202 if (GNUNET_SCHEDULER_NO_TASK != t->timeout_task)
2203 GNUNET_SCHEDULER_cancel (t->timeout_task);
2205 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_multiply
2206 (REFRESH_PATH_TIME, 4), &tunnel_timeout, t);
2210 /******************************************************************************/
2211 /**************** MESH NETWORK HANDLER HELPERS ***********************/
2212 /******************************************************************************/
2215 * Function called to notify a client about the socket
2216 * being ready to queue more data. "buf" will be
2217 * NULL and "size" zero if the socket was closed for
2218 * writing in the meantime.
2220 * @param cls closure
2221 * @param size number of bytes available in buf
2222 * @param buf where the callee should write the message
2223 * @return number of bytes written to buf
2226 send_core_create_path (void *cls, size_t size, void *buf)
2228 struct MeshPathInfo *info = cls;
2229 struct GNUNET_MESH_ManipulatePath *msg;
2230 struct GNUNET_PeerIdentity *peer_ptr;
2231 struct MeshPeerInfo *peer = info->peer;
2232 struct MeshTunnel *t = info->t;
2233 struct MeshPeerPath *p = info->path;
2237 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: CREATE PATH sending...\n");
2239 sizeof (struct GNUNET_MESH_ManipulatePath) +
2240 p->length * sizeof (struct GNUNET_PeerIdentity);
2242 if (size < size_needed || NULL == buf)
2244 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: create path retransmit!\n");
2245 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: buf: %p\n", buf);
2246 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: size: (%u/%u)\n", size,
2248 info->peer->core_transmit[info->pos] =
2249 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0,
2250 GNUNET_TIME_UNIT_FOREVER_REL,
2251 path_get_first_hop (t->tree,
2253 size_needed, &send_core_create_path,
2257 info->peer->core_transmit[info->pos] = NULL;
2260 struct GNUNET_PeerIdentity id;
2262 GNUNET_PEER_resolve (peer->id, &id);
2263 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2264 "MESH: setting core_transmit %s [%u] to NULL\n",
2265 GNUNET_i2s (&id), info->pos);
2268 msg = (struct GNUNET_MESH_ManipulatePath *) buf;
2269 msg->header.size = htons (size_needed);
2270 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE);
2271 msg->tid = ntohl (t->id.tid);
2273 peer_ptr = (struct GNUNET_PeerIdentity *) &msg[1];
2274 for (i = 0; i < p->length; i++)
2276 GNUNET_PEER_resolve (p->peers[i], peer_ptr++);
2282 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2283 "MESH: CREATE PATH (%u bytes long) sent!\n", size_needed);
2289 * Function called to notify a client about the socket
2290 * being ready to queue more data. "buf" will be
2291 * NULL and "size" zero if the socket was closed for
2292 * writing in the meantime.
2294 * @param cls closure (data itself)
2295 * @param size number of bytes available in buf
2296 * @param buf where the callee should write the message
2298 * @return number of bytes written to buf
2301 send_core_data_multicast (void *cls, size_t size, void *buf)
2303 struct MeshDataDescriptor *info = cls;
2306 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Multicast callback.\n");
2307 GNUNET_assert (NULL != info);
2308 GNUNET_assert (NULL != info->peer);
2309 total_size = info->size;
2310 GNUNET_assert (total_size < GNUNET_SERVER_MAX_MESSAGE_SIZE);
2312 if (total_size > size)
2315 struct GNUNET_PeerIdentity id;
2317 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2318 "MESH: Multicast: retransmitting... (%u/%u)\n", size,
2320 GNUNET_PEER_resolve (info->peer->id, &id);
2321 info->peer->core_transmit[info->handler_n] =
2322 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0,
2323 GNUNET_TIME_UNIT_FOREVER_REL, &id,
2325 &send_core_data_multicast, info);
2328 info->peer->core_transmit[info->handler_n] = NULL;
2329 info->peer->infos[info->handler_n] = NULL;
2330 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: copying data...\n");
2331 memcpy (buf, info->data, total_size);
2334 struct GNUNET_MESH_Multicast *mc;
2335 struct GNUNET_MessageHeader *mh;
2338 if (ntohs (mh->type) == GNUNET_MESSAGE_TYPE_MESH_MULTICAST)
2340 mc = (struct GNUNET_MESH_Multicast *) mh;
2341 mh = (struct GNUNET_MessageHeader *) &mc[1];
2342 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2343 "MESH: multicast, payload type %u\n", ntohs (mh->type));
2344 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2345 "MESH: multicast, payload size %u\n", ntohs (mh->size));
2349 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: type %u\n",
2354 data_descriptor_decrement_multicast (info);
2355 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: freeing info...\n");
2357 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: return %u\n", total_size);
2363 * Function called to notify a client about the socket
2364 * being ready to queue more data. "buf" will be
2365 * NULL and "size" zero if the socket was closed for
2366 * writing in the meantime.
2368 * @param cls closure (MeshDataDescriptor)
2369 * @param size number of bytes available in buf
2370 * @param buf where the callee should write the message
2371 * @return number of bytes written to buf
2374 send_core_path_ack (void *cls, size_t size, void *buf)
2376 struct MeshDataDescriptor *info = cls;
2377 struct GNUNET_MESH_PathACK *msg = buf;
2379 GNUNET_assert (NULL != info);
2382 info->peer->core_transmit[info->handler_n] = NULL;
2384 if (sizeof (struct GNUNET_MESH_PathACK) > size)
2389 msg->header.size = htons (sizeof (struct GNUNET_MESH_PathACK));
2390 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_ACK);
2391 GNUNET_PEER_resolve (info->origin->oid, &msg->oid);
2392 msg->tid = htonl (info->origin->tid);
2393 msg->peer_id = my_full_id;
2395 /* TODO add signature */
2397 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: PATH ACK sent!\n");
2398 return sizeof (struct GNUNET_MESH_PathACK);
2402 /******************************************************************************/
2403 /******************** MESH NETWORK HANDLERS **************************/
2404 /******************************************************************************/
2408 * Core handler for path creation
2410 * @param cls closure
2411 * @param message message
2412 * @param peer peer identity this notification is about
2413 * @param atsi performance data
2414 * @param atsi_count number of records in 'atsi'
2416 * @return GNUNET_OK to keep the connection open,
2417 * GNUNET_SYSERR to close it (signal serious error)
2420 handle_mesh_path_create (void *cls, const struct GNUNET_PeerIdentity *peer,
2421 const struct GNUNET_MessageHeader *message,
2422 const struct GNUNET_ATS_Information *atsi,
2423 unsigned int atsi_count)
2425 unsigned int own_pos;
2428 MESH_TunnelNumber tid;
2429 struct GNUNET_MESH_ManipulatePath *msg;
2430 struct GNUNET_PeerIdentity *pi;
2431 GNUNET_HashCode hash;
2432 struct MeshPeerPath *path;
2433 struct MeshPeerInfo *dest_peer_info;
2434 struct MeshPeerInfo *orig_peer_info;
2435 struct MeshTunnel *t;
2437 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2438 "MESH: Received a path create msg [%s]\n",
2439 GNUNET_i2s (&my_full_id));
2440 size = ntohs (message->size);
2441 if (size < sizeof (struct GNUNET_MESH_ManipulatePath))
2443 GNUNET_break_op (0);
2447 size -= sizeof (struct GNUNET_MESH_ManipulatePath);
2448 if (size % sizeof (struct GNUNET_PeerIdentity))
2450 GNUNET_break_op (0);
2453 size /= sizeof (struct GNUNET_PeerIdentity);
2456 GNUNET_break_op (0);
2459 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: path has %u hops.\n", size);
2460 msg = (struct GNUNET_MESH_ManipulatePath *) message;
2462 tid = ntohl (msg->tid);
2463 pi = (struct GNUNET_PeerIdentity *) &msg[1];
2464 t = tunnel_get (pi, tid);
2465 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2466 "MESH: path is for tunnel %s [%X].\n", GNUNET_i2s (pi), tid);
2469 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Creating tunnel\n");
2470 t = GNUNET_malloc (sizeof (struct MeshTunnel));
2471 t->id.oid = GNUNET_PEER_intern (pi);
2473 while (NULL != tunnel_get_incoming (next_local_tid))
2474 next_local_tid = (next_local_tid + 1) | GNUNET_MESH_LOCAL_TUNNEL_ID_SERV;
2475 t->local_tid = next_local_tid++;
2476 next_local_tid = next_local_tid | GNUNET_MESH_LOCAL_TUNNEL_ID_SERV;
2477 t->tree = tree_new (t->id.oid);
2479 GNUNET_CRYPTO_hash (&t->id, sizeof (struct MESH_TunnelID), &hash);
2481 GNUNET_CONTAINER_multihashmap_put (tunnels, &hash, t,
2482 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST))
2488 tunnel_reset_timeout (t);
2489 GNUNET_CRYPTO_hash (&t->local_tid, sizeof (MESH_TunnelNumber), &hash);
2491 GNUNET_CONTAINER_multihashmap_put (incoming_tunnels, &hash, t,
2492 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST))
2500 GNUNET_CONTAINER_multihashmap_get (peers, &pi[size - 1].hashPubKey);
2501 if (NULL == dest_peer_info)
2503 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2504 "MESH: Creating PeerInfo for destination.\n");
2505 dest_peer_info = GNUNET_malloc (sizeof (struct MeshPeerInfo));
2506 dest_peer_info->id = GNUNET_PEER_intern (&pi[size - 1]);
2507 GNUNET_CONTAINER_multihashmap_put (peers, &pi[size - 1].hashPubKey,
2509 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
2511 orig_peer_info = GNUNET_CONTAINER_multihashmap_get (peers, &pi->hashPubKey);
2512 if (NULL == orig_peer_info)
2514 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2515 "MESH: Creating PeerInfo for origin.\n");
2516 orig_peer_info = GNUNET_malloc (sizeof (struct MeshPeerInfo));
2517 orig_peer_info->id = GNUNET_PEER_intern (pi);
2518 GNUNET_CONTAINER_multihashmap_put (peers, &pi->hashPubKey, orig_peer_info,
2519 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
2521 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Creating path...\n");
2522 path = path_new (size);
2524 for (i = 0; i < size; i++)
2526 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: ... adding %s\n",
2527 GNUNET_i2s (&pi[i]));
2528 path->peers[i] = GNUNET_PEER_intern (&pi[i]);
2529 if (path->peers[i] == myid)
2532 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Own position: %u\n", own_pos);
2535 /* cannot be self, must be 'not found' */
2536 /* create path: self not found in path through self */
2537 GNUNET_break_op (0);
2538 path_destroy (path);
2539 /* FIXME error. destroy tunnel? leave for timeout? */
2542 tunnel_add_path (t, path, own_pos);
2543 if (own_pos == size - 1)
2545 /* It is for us! Send ack. */
2546 struct GNUNET_MESH_TunnelNotification cmsg;
2547 struct MeshDataDescriptor *info;
2550 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: It's for us!\n");
2551 peer_info_add_path_to_origin (orig_peer_info, path, GNUNET_NO);
2552 if (NULL == t->peers)
2553 t->peers = GNUNET_CONTAINER_multihashmap_create (4);
2554 GNUNET_break (GNUNET_OK ==
2555 GNUNET_CONTAINER_multihashmap_put (t->peers,
2556 &my_full_id.hashPubKey,
2559 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST));
2560 /* FIXME use send_message */
2561 info = GNUNET_malloc (sizeof (struct MeshDataDescriptor));
2562 info->origin = &t->id;
2563 info->peer = GNUNET_CONTAINER_multihashmap_get (peers, &peer->hashPubKey);
2564 GNUNET_assert (NULL != info->peer);
2565 j = peer_info_transmit_slot (info->peer);
2566 info->handler_n = j;
2567 info->peer->types[j] = GNUNET_MESSAGE_TYPE_MESH_PATH_ACK;
2568 info->peer->infos[j] = info;
2569 info->peer->core_transmit[j] =
2570 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 100,
2571 GNUNET_TIME_UNIT_FOREVER_REL, peer,
2572 sizeof (struct GNUNET_MESH_PathACK),
2573 &send_core_path_ack, info);
2574 cmsg.header.size = htons (sizeof (cmsg));
2575 cmsg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE);
2576 GNUNET_PEER_resolve (t->id.oid, &cmsg.peer);
2577 cmsg.tunnel_id = htonl (t->local_tid);
2578 GNUNET_SERVER_notification_context_broadcast (nc, &cmsg.header, GNUNET_NO);
2582 struct MeshPeerPath *path2;
2584 /* It's for somebody else! Retransmit. */
2585 path2 = path_duplicate (path);
2586 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Retransmitting.\n");
2587 peer_info_add_path (dest_peer_info, path2, GNUNET_NO);
2588 path2 = path_duplicate (path);
2589 peer_info_add_path_to_origin (orig_peer_info, path2, GNUNET_NO);
2590 send_create_path (dest_peer_info, path, t);
2597 * Core handler for path destruction
2599 * @param cls closure
2600 * @param message message
2601 * @param peer peer identity this notification is about
2602 * @param atsi performance data
2603 * @param atsi_count number of records in 'atsi'
2605 * @return GNUNET_OK to keep the connection open,
2606 * GNUNET_SYSERR to close it (signal serious error)
2609 handle_mesh_path_destroy (void *cls, const struct GNUNET_PeerIdentity *peer,
2610 const struct GNUNET_MessageHeader *message,
2611 const struct GNUNET_ATS_Information *atsi,
2612 unsigned int atsi_count)
2614 struct GNUNET_MESH_ManipulatePath *msg;
2615 struct GNUNET_PeerIdentity *pi;
2616 struct MeshPeerPath *path;
2617 struct MeshTunnel *t;
2618 unsigned int own_pos;
2622 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2623 "MESH: Received a PATH DESTROY msg from %s\n", GNUNET_i2s (peer));
2624 size = ntohs (message->size);
2625 if (size < sizeof (struct GNUNET_MESH_ManipulatePath))
2627 GNUNET_break_op (0);
2631 size -= sizeof (struct GNUNET_MESH_ManipulatePath);
2632 if (size % sizeof (struct GNUNET_PeerIdentity))
2634 GNUNET_break_op (0);
2637 size /= sizeof (struct GNUNET_PeerIdentity);
2640 GNUNET_break_op (0);
2643 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: path has %u hops.\n", size);
2645 msg = (struct GNUNET_MESH_ManipulatePath *) message;
2646 pi = (struct GNUNET_PeerIdentity *) &msg[1];
2647 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2648 "MESH: path is for tunnel %s [%X].\n", GNUNET_i2s (pi),
2650 t = tunnel_get (pi, ntohl (msg->tid));
2653 /* TODO notify back: we don't know this tunnel */
2654 GNUNET_break_op (0);
2657 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Creating path...\n");
2658 path = path_new (size);
2660 for (i = 0; i < size; i++)
2662 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: ... adding %s\n",
2663 GNUNET_i2s (&pi[i]));
2664 path->peers[i] = GNUNET_PEER_intern (&pi[i]);
2665 if (path->peers[i] == myid)
2668 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Own position: %u\n", own_pos);
2669 if (own_pos < path->length - 1)
2670 send_message (message, &pi[own_pos + 1]);
2671 tunnel_delete_peer (t, path->peers[path->length - 1]);
2672 path_destroy (path);
2678 * Core handler for notifications of broken paths
2680 * @param cls closure
2681 * @param message message
2682 * @param peer peer identity this notification is about
2683 * @param atsi performance data
2684 * @param atsi_count number of records in 'atsi'
2686 * @return GNUNET_OK to keep the connection open,
2687 * GNUNET_SYSERR to close it (signal serious error)
2690 handle_mesh_path_broken (void *cls, const struct GNUNET_PeerIdentity *peer,
2691 const struct GNUNET_MessageHeader *message,
2692 const struct GNUNET_ATS_Information *atsi,
2693 unsigned int atsi_count)
2695 struct GNUNET_MESH_PathBroken *msg;
2696 struct MeshTunnel *t;
2698 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2699 "MESH: Received a PATH BROKEN msg from %s\n", GNUNET_i2s (peer));
2700 msg = (struct GNUNET_MESH_PathBroken *) message;
2701 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: regarding %s\n",
2702 GNUNET_i2s (&msg->peer1));
2703 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: regarding %s\n",
2704 GNUNET_i2s (&msg->peer2));
2705 t = tunnel_get (&msg->oid, ntohl (msg->tid));
2708 GNUNET_break_op (0);
2711 tunnel_notify_connection_broken (t, GNUNET_PEER_search (&msg->peer1),
2712 GNUNET_PEER_search (&msg->peer2));
2719 * Core handler for tunnel destruction
2721 * @param cls closure
2722 * @param message message
2723 * @param peer peer identity this notification is about
2724 * @param atsi performance data
2725 * @param atsi_count number of records in 'atsi'
2727 * @return GNUNET_OK to keep the connection open,
2728 * GNUNET_SYSERR to close it (signal serious error)
2731 handle_mesh_tunnel_destroy (void *cls, const struct GNUNET_PeerIdentity *peer,
2732 const struct GNUNET_MessageHeader *message,
2733 const struct GNUNET_ATS_Information *atsi,
2734 unsigned int atsi_count)
2736 struct GNUNET_MESH_TunnelDestroy *msg;
2737 struct MeshTunnel *t;
2739 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2740 "MESH: Got a TUNNEL DESTROY packet from %s\n", GNUNET_i2s (peer));
2741 msg = (struct GNUNET_MESH_TunnelDestroy *) message;
2742 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: for tunnel %s [%u]\n",
2743 GNUNET_i2s (&msg->oid), ntohl (msg->tid));
2744 t = tunnel_get (&msg->oid, ntohl (msg->tid));
2747 /* Probably already got the message from another path,
2748 * destroyed the tunnel and retransmitted to children.
2753 if (t->id.oid == myid)
2755 GNUNET_break_op (0);
2758 if (t->local_tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
2760 /* Tunnel was incoming, notify clients */
2761 send_clients_tunnel_destroy (t);
2763 tunnel_send_destroy (t);
2770 * Core handler for mesh network traffic going from the origin to a peer
2772 * @param cls closure
2773 * @param peer peer identity this notification is about
2774 * @param message message
2775 * @param atsi performance data
2776 * @param atsi_count number of records in 'atsi'
2777 * @return GNUNET_OK to keep the connection open,
2778 * GNUNET_SYSERR to close it (signal serious error)
2781 handle_mesh_data_unicast (void *cls, const struct GNUNET_PeerIdentity *peer,
2782 const struct GNUNET_MessageHeader *message,
2783 const struct GNUNET_ATS_Information *atsi,
2784 unsigned int atsi_count)
2786 struct GNUNET_MESH_Unicast *msg;
2787 struct MeshTunnel *t;
2791 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: got a unicast packet from %s\n",
2793 size = ntohs (message->size);
2795 sizeof (struct GNUNET_MESH_Unicast) +
2796 sizeof (struct GNUNET_MessageHeader))
2801 msg = (struct GNUNET_MESH_Unicast *) message;
2802 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: of type %u\n",
2803 ntohs (msg[1].header.type));
2804 t = tunnel_get (&msg->oid, ntohl (msg->tid));
2807 /* TODO notify back: we don't know this tunnel */
2808 GNUNET_break_op (0);
2811 tunnel_reset_timeout (t);
2812 pid = GNUNET_PEER_search (&msg->destination);
2815 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2816 "MESH: it's for us! sending to clients...\n");
2817 send_subscribed_clients (message, (struct GNUNET_MessageHeader *) &msg[1]);
2820 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2821 "MESH: not for us, retransmitting...\n");
2822 send_message (message, path_get_first_hop (t->tree, pid));
2828 * Core handler for mesh network traffic going from the origin to all peers
2830 * @param cls closure
2831 * @param message message
2832 * @param peer peer identity this notification is about
2833 * @param atsi performance data
2834 * @param atsi_count number of records in 'atsi'
2835 * @return GNUNET_OK to keep the connection open,
2836 * GNUNET_SYSERR to close it (signal serious error)
2838 * TODO: Check who we got this from, to validate route.
2841 handle_mesh_data_multicast (void *cls, const struct GNUNET_PeerIdentity *peer,
2842 const struct GNUNET_MessageHeader *message,
2843 const struct GNUNET_ATS_Information *atsi,
2844 unsigned int atsi_count)
2846 struct GNUNET_MESH_Multicast *msg;
2847 struct MeshTunnel *t;
2850 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: got a multicast packet from %s\n",
2852 size = ntohs (message->size);
2853 if (sizeof (struct GNUNET_MESH_Multicast) +
2854 sizeof (struct GNUNET_MessageHeader) > size)
2856 GNUNET_break_op (0);
2859 msg = (struct GNUNET_MESH_Multicast *) message;
2860 t = tunnel_get (&msg->oid, ntohl (msg->tid));
2864 /* TODO notify that we dont know that tunnel */
2865 GNUNET_break_op (0);
2868 tunnel_reset_timeout (t);
2870 /* Transmit to locally interested clients */
2871 if (NULL != t->peers &&
2872 GNUNET_CONTAINER_multihashmap_contains (t->peers, &my_full_id.hashPubKey))
2874 send_subscribed_clients (message, &msg[1].header);
2876 tunnel_send_multicast (t, message);
2882 * Core handler for mesh network traffic toward the owner of a tunnel
2884 * @param cls closure
2885 * @param message message
2886 * @param peer peer identity this notification is about
2887 * @param atsi performance data
2888 * @param atsi_count number of records in 'atsi'
2890 * @return GNUNET_OK to keep the connection open,
2891 * GNUNET_SYSERR to close it (signal serious error)
2894 handle_mesh_data_to_orig (void *cls, const struct GNUNET_PeerIdentity *peer,
2895 const struct GNUNET_MessageHeader *message,
2896 const struct GNUNET_ATS_Information *atsi,
2897 unsigned int atsi_count)
2899 struct GNUNET_MESH_ToOrigin *msg;
2900 struct GNUNET_PeerIdentity id;
2901 struct MeshPeerInfo *peer_info;
2902 struct MeshTunnel *t;
2905 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: got a ToOrigin packet from %s\n",
2907 size = ntohs (message->size);
2908 if (size < sizeof (struct GNUNET_MESH_ToOrigin) + /* Payload must be */
2909 sizeof (struct GNUNET_MessageHeader)) /* at least a header */
2911 GNUNET_break_op (0);
2914 msg = (struct GNUNET_MESH_ToOrigin *) message;
2915 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: of type %u\n",
2916 ntohs (msg[1].header.type));
2917 t = tunnel_get (&msg->oid, ntohl (msg->tid));
2921 /* TODO notify that we dont know this tunnel (whom)? */
2922 GNUNET_break_op (0);
2926 if (t->id.oid == myid)
2929 struct GNUNET_MESH_ToOrigin *copy;
2931 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2932 "MESH: it's for us! sending to clients...\n");
2933 if (NULL == t->client)
2935 /* got data packet for ownerless tunnel */
2936 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: no clients!\n");
2937 GNUNET_break_op (0);
2940 /* TODO signature verification */
2941 memcpy (cbuf, message, size);
2942 copy = (struct GNUNET_MESH_ToOrigin *) cbuf;
2943 copy->tid = htonl (t->local_tid);
2944 GNUNET_SERVER_notification_context_unicast (nc, t->client->handle,
2945 ©->header, GNUNET_YES);
2948 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2949 "MESH: not for us, retransmitting...\n");
2951 peer_info = peer_info_get (&msg->oid);
2952 if (NULL == peer_info)
2954 /* unknown origin of tunnel */
2958 GNUNET_PEER_resolve (tree_get_predecessor (t->tree), &id);
2959 send_message (message, &id);
2966 * Core handler for path ACKs
2968 * @param cls closure
2969 * @param message message
2970 * @param peer peer identity this notification is about
2971 * @param atsi performance data
2972 * @param atsi_count number of records in 'atsi'
2974 * @return GNUNET_OK to keep the connection open,
2975 * GNUNET_SYSERR to close it (signal serious error)
2978 handle_mesh_path_ack (void *cls, const struct GNUNET_PeerIdentity *peer,
2979 const struct GNUNET_MessageHeader *message,
2980 const struct GNUNET_ATS_Information *atsi,
2981 unsigned int atsi_count)
2983 struct GNUNET_MESH_PathACK *msg;
2984 struct GNUNET_PeerIdentity id;
2985 struct MeshPeerInfo *peer_info;
2986 struct MeshTunnel *t;
2988 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Received a path ACK msg [%s]\n",
2989 GNUNET_i2s (&my_full_id));
2990 msg = (struct GNUNET_MESH_PathACK *) message;
2991 t = tunnel_get (&msg->oid, msg->tid);
2994 /* TODO notify that we don't know the tunnel */
2998 /* Message for us? */
2999 if (0 == memcmp (&msg->oid, &my_full_id, sizeof (struct GNUNET_PeerIdentity)))
3001 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: It's for us!\n");
3002 if (NULL == t->client)
3004 GNUNET_break_op (0);
3007 if (NULL != t->dht_get_type)
3009 GNUNET_DHT_get_stop (t->dht_get_type);
3010 t->dht_get_type = NULL;
3012 peer_info = peer_info_get (&msg->peer_id);
3013 tree_set_status (t->tree, peer_info->id, MESH_PEER_READY);
3014 send_client_peer_connected (t, peer_info->id);
3018 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3019 "MESH: not for us, retransmitting...\n");
3020 GNUNET_PEER_resolve (tree_get_predecessor (t->tree), &id);
3021 peer_info = peer_info_get (&msg->oid);
3022 if (NULL == peer_info)
3024 /* If we know the tunnel, we should DEFINITELY know the peer */
3028 send_message (message, &id);
3034 * Functions to handle messages from core
3036 static struct GNUNET_CORE_MessageHandler core_handlers[] = {
3037 {&handle_mesh_path_create, GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE, 0},
3038 {&handle_mesh_path_destroy, GNUNET_MESSAGE_TYPE_MESH_PATH_DESTROY, 0},
3039 {&handle_mesh_path_broken, GNUNET_MESSAGE_TYPE_MESH_PATH_BROKEN,
3040 sizeof (struct GNUNET_MESH_PathBroken)},
3041 {&handle_mesh_tunnel_destroy, GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY, 0},
3042 {&handle_mesh_data_unicast, GNUNET_MESSAGE_TYPE_MESH_UNICAST, 0},
3043 {&handle_mesh_data_multicast, GNUNET_MESSAGE_TYPE_MESH_MULTICAST, 0},
3044 {&handle_mesh_data_to_orig, GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN, 0},
3045 {&handle_mesh_path_ack, GNUNET_MESSAGE_TYPE_MESH_PATH_ACK,
3046 sizeof (struct GNUNET_MESH_PathACK)},
3052 /******************************************************************************/
3053 /**************** MESH LOCAL HANDLER HELPERS ***********************/
3054 /******************************************************************************/
3057 * deregister_app: iterator for removing each application registered by a client
3059 * @param cls closure
3060 * @param key the hash of the application id (used to access the hashmap)
3061 * @param value the value stored at the key (client)
3063 * @return GNUNET_OK on success
3066 deregister_app (void *cls, const GNUNET_HashCode * key, void *value)
3068 GNUNET_break (GNUNET_YES ==
3069 GNUNET_CONTAINER_multihashmap_remove (applications, key,
3076 * notify_client_connection_failure: notify a client that the connection to the
3077 * requested remote peer is not possible (for instance, no route found)
3078 * Function called when the socket is ready to queue more data. "buf" will be
3079 * NULL and "size" zero if the socket was closed for writing in the meantime.
3081 * @param cls closure
3082 * @param size number of bytes available in buf
3083 * @param buf where the callee should write the message
3084 * @return number of bytes written to buf
3087 notify_client_connection_failure (void *cls, size_t size, void *buf)
3090 struct MeshPeerInfo *peer_info;
3091 struct GNUNET_MESH_PeerControl *msg;
3092 struct GNUNET_PeerIdentity id;
3094 if (0 == size && NULL == buf)
3096 // TODO retry? cancel?
3100 size_needed = sizeof (struct GNUNET_MESH_PeerControl);
3101 peer_info = (struct MeshPeerInfo *) cls;
3102 msg = (struct GNUNET_MESH_PeerControl *) buf;
3103 msg->header.size = htons (sizeof (struct GNUNET_MESH_PeerControl));
3104 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_DISCONNECTED);
3105 // msg->tunnel_id = htonl(peer_info->t->tid);
3106 GNUNET_PEER_resolve (peer_info->id, &id);
3107 memcpy (&msg->peer, &id, sizeof (struct GNUNET_PeerIdentity));
3115 * Send keepalive packets for a peer
3117 * @param cls Closure (tunnel for which to send the keepalive).
3118 * @param tc Notification context.
3120 * TODO: implement explicit multicast keepalive?
3123 path_refresh (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
3125 struct MeshTunnel *t = cls;
3126 struct GNUNET_MessageHeader *payload;
3127 struct GNUNET_MESH_Multicast *msg;
3129 sizeof (struct GNUNET_MESH_Multicast) +
3130 sizeof (struct GNUNET_MessageHeader);
3133 if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN)
3137 t->path_refresh_task = GNUNET_SCHEDULER_NO_TASK;
3139 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3140 "MESH: sending keepalive for tunnel %d\n", t->id.tid);
3142 msg = (struct GNUNET_MESH_Multicast *) cbuf;
3143 msg->header.size = htons (size);
3144 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_MULTICAST);
3145 msg->oid = my_full_id;
3146 msg->tid = htonl (t->id.tid);
3147 payload = (struct GNUNET_MessageHeader *) &msg[1];
3148 payload->size = htons (sizeof (struct GNUNET_MessageHeader));
3149 payload->type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_KEEPALIVE);
3150 tunnel_send_multicast (t, &msg->header);
3152 t->path_refresh_task =
3153 GNUNET_SCHEDULER_add_delayed (REFRESH_PATH_TIME, &path_refresh, t);
3159 * Function to process paths received for a new peer addition. The recorded
3160 * paths form the initial tunnel, which can be optimized later.
3161 * Called on each result obtained for the DHT search.
3163 * @param cls closure
3164 * @param exp when will this value expire
3165 * @param key key of the result
3166 * @param type type of the result
3167 * @param size number of bytes in data
3168 * @param data pointer to the result data
3170 * TODO: re-issue the request after certain time? cancel after X results?
3173 dht_get_id_handler (void *cls, struct GNUNET_TIME_Absolute exp,
3174 const GNUNET_HashCode * key,
3175 const struct GNUNET_PeerIdentity *get_path,
3176 unsigned int get_path_length,
3177 const struct GNUNET_PeerIdentity *put_path,
3178 unsigned int put_path_length, enum GNUNET_BLOCK_Type type,
3179 size_t size, const void *data)
3181 struct MeshPathInfo *path_info = cls;
3182 struct MeshPeerPath *p;
3183 struct GNUNET_PeerIdentity pi;
3186 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Got results from DHT!\n");
3187 GNUNET_PEER_resolve (path_info->peer->id, &pi);
3188 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: for %s\n", GNUNET_i2s (&pi));
3189 // GNUNET_DHT_get_stop(path_info->peer->dhtget);
3190 // path_info->peer->dhtget = NULL;
3192 p = path_build_from_dht (get_path, get_path_length, put_path,
3194 peer_info_add_path (path_info->peer, p, GNUNET_NO);
3195 for (i = 0; i < path_info->peer->ntunnels; i++)
3197 tunnel_add_peer (path_info->peer->tunnels[i], path_info->peer);
3198 peer_info_connect (path_info->peer, path_info->t);
3200 // GNUNET_free (path_info);
3207 * Function to process paths received for a new peer addition. The recorded
3208 * paths form the initial tunnel, which can be optimized later.
3209 * Called on each result obtained for the DHT search.
3211 * @param cls closure
3212 * @param exp when will this value expire
3213 * @param key key of the result
3214 * @param type type of the result
3215 * @param size number of bytes in data
3216 * @param data pointer to the result data
3219 dht_get_type_handler (void *cls, struct GNUNET_TIME_Absolute exp,
3220 const GNUNET_HashCode * key,
3221 const struct GNUNET_PeerIdentity *get_path,
3222 unsigned int get_path_length,
3223 const struct GNUNET_PeerIdentity *put_path,
3224 unsigned int put_path_length, enum GNUNET_BLOCK_Type type,
3225 size_t size, const void *data)
3227 const struct GNUNET_PeerIdentity *pi = data;
3228 struct MeshTunnel *t = cls;
3229 struct MeshPeerInfo *peer_info;
3230 struct MeshPeerPath *p;
3232 if (size != sizeof (struct GNUNET_PeerIdentity))
3234 GNUNET_break_op (0);
3237 GNUNET_assert (NULL != t->client);
3238 peer_info = peer_info_get (pi);
3239 (void) GNUNET_CONTAINER_multihashmap_put (t->peers, &pi->hashPubKey,
3241 GNUNET_CONTAINER_MULTIHASHMAPOPTION_REPLACE);
3243 p = path_build_from_dht (get_path, get_path_length, put_path,
3245 peer_info_add_path (peer_info, p, GNUNET_NO);
3246 tunnel_add_peer (t, peer_info);
3247 peer_info_connect (peer_info, t);
3251 /******************************************************************************/
3252 /********************* MESH LOCAL HANDLES **************************/
3253 /******************************************************************************/
3257 * Handler for client disconnection
3259 * @param cls closure
3260 * @param client identification of the client; NULL
3261 * for the last call when the server is destroyed
3264 handle_local_client_disconnect (void *cls, struct GNUNET_SERVER_Client *client)
3266 struct MeshClient *c;
3267 struct MeshClient *next;
3269 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: client disconnected\n");
3272 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: (SERVER DOWN)\n");
3278 if (c->handle != client && NULL != client)
3280 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: ... searching\n");
3284 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: matching client found\n");
3285 GNUNET_SERVER_client_drop (c->handle);
3286 if (NULL != c->tunnels)
3288 GNUNET_CONTAINER_multihashmap_iterate (c->tunnels,
3289 &tunnel_destroy_iterator, c);
3290 GNUNET_CONTAINER_multihashmap_destroy (c->tunnels);
3293 /* deregister clients applications */
3294 if (NULL != c->apps)
3296 GNUNET_CONTAINER_multihashmap_iterate (c->apps, &deregister_app, NULL);
3297 GNUNET_CONTAINER_multihashmap_destroy (c->apps);
3299 if (0 == GNUNET_CONTAINER_multihashmap_size (applications) &&
3300 GNUNET_SCHEDULER_NO_TASK != announce_applications_task)
3302 GNUNET_SCHEDULER_cancel (announce_applications_task);
3303 announce_applications_task = GNUNET_SCHEDULER_NO_TASK;
3305 if (NULL != c->types)
3306 GNUNET_CONTAINER_multihashmap_destroy (c->types);
3308 GNUNET_CONTAINER_DLL_remove (clients, clients_tail, c);
3309 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: CLIENT FREE at %p\n", c);
3314 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: done!\n");
3320 * Handler for new clients
3322 * @param cls closure
3323 * @param client identification of the client
3324 * @param message the actual message, which includes messages the client wants
3327 handle_local_new_client (void *cls, struct GNUNET_SERVER_Client *client,
3328 const struct GNUNET_MessageHeader *message)
3330 struct GNUNET_MESH_ClientConnect *cc_msg;
3331 struct MeshClient *c;
3332 GNUNET_MESH_ApplicationType *a;
3339 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: new client connected\n");
3340 /* Check data sanity */
3341 size = ntohs (message->size) - sizeof (struct GNUNET_MESH_ClientConnect);
3342 cc_msg = (struct GNUNET_MESH_ClientConnect *) message;
3343 ntypes = ntohs (cc_msg->types);
3344 napps = ntohs (cc_msg->applications);
3346 ntypes * sizeof (uint16_t) + napps * sizeof (GNUNET_MESH_ApplicationType))
3349 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3353 /* Create new client structure */
3354 c = GNUNET_malloc (sizeof (struct MeshClient));
3356 c->id = next_client_id++;
3358 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: CLIENT NEW %u at %p\n", c->id,
3361 GNUNET_SERVER_client_keep (client);
3362 a = (GNUNET_MESH_ApplicationType *) &cc_msg[1];
3365 GNUNET_MESH_ApplicationType at;
3368 c->apps = GNUNET_CONTAINER_multihashmap_create (napps);
3369 for (i = 0; i < napps; i++)
3372 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: app type: %u\n", at);
3373 GNUNET_CRYPTO_hash (&at, sizeof (at), &hc);
3374 /* store in clients hashmap */
3375 GNUNET_CONTAINER_multihashmap_put (c->apps, &hc, c,
3376 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
3377 /* store in global hashmap, for announcements */
3378 GNUNET_CONTAINER_multihashmap_put (applications, &hc, c,
3379 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
3381 if (GNUNET_SCHEDULER_NO_TASK == announce_applications_task)
3382 announce_applications_task =
3383 GNUNET_SCHEDULER_add_now (&announce_applications, NULL);
3391 t = (uint16_t *) & a[napps];
3392 c->types = GNUNET_CONTAINER_multihashmap_create (ntypes);
3393 for (i = 0; i < ntypes; i++)
3396 GNUNET_CRYPTO_hash (&u16, sizeof (u16), &hc);
3398 /* store in clients hashmap */
3399 GNUNET_CONTAINER_multihashmap_put (c->types, &hc, c,
3400 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
3401 /* store in global hashmap */
3402 GNUNET_CONTAINER_multihashmap_put (types, &hc, c,
3403 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
3406 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3407 "MESH: client has %u+%u subscriptions\n", napps, ntypes);
3409 GNUNET_CONTAINER_DLL_insert (clients, clients_tail, c);
3410 c->tunnels = GNUNET_CONTAINER_multihashmap_create (32);
3411 GNUNET_SERVER_notification_context_add (nc, client);
3413 GNUNET_SERVER_receive_done (client, GNUNET_OK);
3415 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: new client processed\n");
3421 * Handler for requests of new tunnels
3423 * @param cls closure
3424 * @param client identification of the client
3425 * @param message the actual message
3428 handle_local_tunnel_create (void *cls, struct GNUNET_SERVER_Client *client,
3429 const struct GNUNET_MessageHeader *message)
3431 struct GNUNET_MESH_TunnelMessage *t_msg;
3432 struct MeshTunnel *t;
3433 struct MeshClient *c;
3434 GNUNET_HashCode hash;
3436 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: new tunnel requested\n");
3438 /* Sanity check for client registration */
3439 if (NULL == (c = client_get (client)))
3442 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3446 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: by client %u\n", c->id);
3449 /* Message sanity check */
3450 if (sizeof (struct GNUNET_MESH_TunnelMessage) != ntohs (message->size))
3453 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3457 t_msg = (struct GNUNET_MESH_TunnelMessage *) message;
3458 /* Sanity check for tunnel numbering */
3459 if (0 == (ntohl (t_msg->tunnel_id) & GNUNET_MESH_LOCAL_TUNNEL_ID_CLI))
3462 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3465 /* Sanity check for duplicate tunnel IDs */
3466 if (NULL != tunnel_get_by_local_id (c, ntohl (t_msg->tunnel_id)))
3469 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3473 t = GNUNET_malloc (sizeof (struct MeshTunnel));
3474 while (NULL != tunnel_get_by_pi (myid, next_tid))
3475 next_tid = (next_tid + 1) & ~GNUNET_MESH_LOCAL_TUNNEL_ID_CLI;
3476 t->id.tid = next_tid++;
3477 next_tid = next_tid & ~GNUNET_MESH_LOCAL_TUNNEL_ID_CLI;
3479 t->local_tid = ntohl (t_msg->tunnel_id);
3481 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: CREATED TUNNEL %s [%x] (%x)\n",
3482 GNUNET_i2s (&my_full_id), t->id.tid, t->local_tid);
3485 t->peers = GNUNET_CONTAINER_multihashmap_create (32);
3487 GNUNET_CRYPTO_hash (&t->local_tid, sizeof (MESH_TunnelNumber), &hash);
3489 GNUNET_CONTAINER_multihashmap_put (c->tunnels, &hash, t,
3490 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
3493 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3497 GNUNET_CRYPTO_hash (&t->id, sizeof (struct MESH_TunnelID), &hash);
3499 GNUNET_CONTAINER_multihashmap_put (tunnels, &hash, t,
3500 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
3503 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3506 t->tree = tree_new (myid);
3507 tree_set_me (t->tree, myid);
3509 GNUNET_SERVER_receive_done (client, GNUNET_OK);
3515 * Handler for requests of deleting tunnels
3517 * @param cls closure
3518 * @param client identification of the client
3519 * @param message the actual message
3522 handle_local_tunnel_destroy (void *cls, struct GNUNET_SERVER_Client *client,
3523 const struct GNUNET_MessageHeader *message)
3525 struct GNUNET_MESH_TunnelMessage *tunnel_msg;
3526 struct MeshClient *c;
3527 struct MeshTunnel *t;
3528 MESH_TunnelNumber tid;
3529 GNUNET_HashCode hash;
3531 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3532 "MESH: Got a DESTROY TUNNEL from client!\n");
3534 /* Sanity check for client registration */
3535 if (NULL == (c = client_get (client)))
3538 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3541 /* Message sanity check */
3542 if (sizeof (struct GNUNET_MESH_TunnelMessage) != ntohs (message->size))
3545 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3549 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: by client %u\n", c->id);
3551 tunnel_msg = (struct GNUNET_MESH_TunnelMessage *) message;
3553 /* Retrieve tunnel */
3554 tid = ntohl (tunnel_msg->tunnel_id);
3556 /* Remove from local id hashmap */
3557 GNUNET_CRYPTO_hash (&tid, sizeof (MESH_TunnelNumber), &hash);
3558 t = GNUNET_CONTAINER_multihashmap_get (c->tunnels, &hash);
3559 GNUNET_assert (GNUNET_YES ==
3560 GNUNET_CONTAINER_multihashmap_remove (c->tunnels, &hash, t));
3563 tunnel_send_destroy (t);
3565 GNUNET_SERVER_receive_done (client, GNUNET_OK);
3571 * Handler for connection requests to new peers
3573 * @param cls closure
3574 * @param client identification of the client
3575 * @param message the actual message (PeerControl)
3578 handle_local_connect_add (void *cls, struct GNUNET_SERVER_Client *client,
3579 const struct GNUNET_MessageHeader *message)
3581 struct GNUNET_MESH_PeerControl *peer_msg;
3582 struct MeshPeerInfo *peer_info;
3583 struct MeshClient *c;
3584 struct MeshTunnel *t;
3585 MESH_TunnelNumber tid;
3587 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Got connection request\n");
3588 /* Sanity check for client registration */
3589 if (NULL == (c = client_get (client)))
3592 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3596 peer_msg = (struct GNUNET_MESH_PeerControl *) message;
3597 /* Sanity check for message size */
3598 if (sizeof (struct GNUNET_MESH_PeerControl) != ntohs (peer_msg->header.size))
3601 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3605 /* Tunnel exists? */
3606 tid = ntohl (peer_msg->tunnel_id);
3607 t = tunnel_get_by_local_id (c, tid);
3611 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3615 /* Does client own tunnel? */
3616 if (t->client->handle != client)
3619 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3622 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: for %s\n",
3623 GNUNET_i2s (&peer_msg->peer));
3624 peer_info = peer_info_get (&peer_msg->peer);
3626 tunnel_add_peer (t, peer_info);
3627 peer_info_connect (peer_info, t);
3629 GNUNET_SERVER_receive_done (client, GNUNET_OK);
3635 * Handler for disconnection requests of peers in a tunnel
3637 * @param cls closure
3638 * @param client identification of the client
3639 * @param message the actual message (PeerControl)
3642 handle_local_connect_del (void *cls, struct GNUNET_SERVER_Client *client,
3643 const struct GNUNET_MessageHeader *message)
3645 struct GNUNET_MESH_PeerControl *peer_msg;
3646 struct MeshPeerInfo *peer_info;
3647 struct MeshClient *c;
3648 struct MeshTunnel *t;
3649 MESH_TunnelNumber tid;
3651 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Got a PEER DEL request\n");
3652 /* Sanity check for client registration */
3653 if (NULL == (c = client_get (client)))
3656 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3659 peer_msg = (struct GNUNET_MESH_PeerControl *) message;
3660 /* Sanity check for message size */
3661 if (sizeof (struct GNUNET_MESH_PeerControl) != ntohs (peer_msg->header.size))
3664 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3668 /* Tunnel exists? */
3669 tid = ntohl (peer_msg->tunnel_id);
3670 t = tunnel_get_by_local_id (c, tid);
3674 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3677 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: on tunnel %X\n", t->id.tid);
3679 /* Does client own tunnel? */
3680 if (t->client->handle != client)
3683 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3687 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: for peer %s\n",
3688 GNUNET_i2s (&peer_msg->peer));
3689 /* Is the peer in the tunnel? */
3691 GNUNET_CONTAINER_multihashmap_get (t->peers, &peer_msg->peer.hashPubKey);
3692 if (NULL == peer_info)
3695 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3699 /* Ok, delete peer from tunnel */
3700 GNUNET_CONTAINER_multihashmap_remove_all (t->peers,
3701 &peer_msg->peer.hashPubKey);
3703 send_destroy_path (t, peer_info->id);
3704 tunnel_delete_peer (t, peer_info->id);
3705 GNUNET_SERVER_receive_done (client, GNUNET_OK);
3711 * Handler for connection requests to new peers by type
3713 * @param cls closure
3714 * @param client identification of the client
3715 * @param message the actual message (ConnectPeerByType)
3718 handle_local_connect_by_type (void *cls, struct GNUNET_SERVER_Client *client,
3719 const struct GNUNET_MessageHeader *message)
3721 struct GNUNET_MESH_ConnectPeerByType *connect_msg;
3722 struct MeshClient *c;
3723 struct MeshTunnel *t;
3724 GNUNET_HashCode hash;
3725 MESH_TunnelNumber tid;
3727 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: got connect by type request\n");
3728 /* Sanity check for client registration */
3729 if (NULL == (c = client_get (client)))
3732 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3736 connect_msg = (struct GNUNET_MESH_ConnectPeerByType *) message;
3737 /* Sanity check for message size */
3738 if (sizeof (struct GNUNET_MESH_ConnectPeerByType) !=
3739 ntohs (connect_msg->header.size))
3742 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3746 /* Tunnel exists? */
3747 tid = ntohl (connect_msg->tunnel_id);
3748 t = tunnel_get_by_local_id (c, tid);
3752 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3756 /* Does client own tunnel? */
3757 if (t->client->handle != client)
3760 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3764 /* Do WE have the service? */
3765 t->type = ntohl (connect_msg->type);
3766 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: type requested: %u\n", t->type);
3767 GNUNET_CRYPTO_hash (&t->type, sizeof (GNUNET_MESH_ApplicationType), &hash);
3768 if (GNUNET_CONTAINER_multihashmap_contains (applications, &hash) ==
3771 /* Yes! Fast forward, add ourselves to the tunnel and send the
3772 * good news to the client
3774 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: available locally\n");
3775 GNUNET_CONTAINER_multihashmap_put (t->peers, &my_full_id.hashPubKey,
3776 peer_info_get (&my_full_id),
3777 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
3779 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: notifying client\n");
3780 send_client_peer_connected (t, myid);
3781 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Done\n");
3782 GNUNET_SERVER_receive_done (client, GNUNET_OK);
3785 /* Ok, lets find a peer offering the service */
3786 if (NULL != t->dht_get_type)
3788 GNUNET_DHT_get_stop (t->dht_get_type);
3790 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: looking in DHT for %s\n",
3791 GNUNET_h2s (&hash));
3793 GNUNET_DHT_get_start (dht_handle, GNUNET_TIME_UNIT_FOREVER_REL,
3794 GNUNET_BLOCK_TYPE_TEST, &hash, 10U,
3795 GNUNET_DHT_RO_RECORD_ROUTE |
3796 GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE, NULL, 0,
3797 &dht_get_type_handler, t);
3799 GNUNET_SERVER_receive_done (client, GNUNET_OK);
3805 * Handler for client traffic directed to one peer
3807 * @param cls closure
3808 * @param client identification of the client
3809 * @param message the actual message
3812 handle_local_unicast (void *cls, struct GNUNET_SERVER_Client *client,
3813 const struct GNUNET_MessageHeader *message)
3815 struct MeshClient *c;
3816 struct MeshTunnel *t;
3817 struct MeshPeerInfo *pi;
3818 struct GNUNET_MESH_Unicast *data_msg;
3819 MESH_TunnelNumber tid;
3822 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3823 "MESH: Got a unicast request from a client!\n");
3825 /* Sanity check for client registration */
3826 if (NULL == (c = client_get (client)))
3829 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3832 data_msg = (struct GNUNET_MESH_Unicast *) message;
3833 /* Sanity check for message size */
3834 size = ntohs (message->size);
3835 if (sizeof (struct GNUNET_MESH_Unicast) +
3836 sizeof (struct GNUNET_MessageHeader) > size)
3839 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3843 /* Tunnel exists? */
3844 tid = ntohl (data_msg->tid);
3845 t = tunnel_get_by_local_id (c, tid);
3849 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3853 /* Is it a local tunnel? Then, does client own the tunnel? */
3854 if (NULL != t->client && NULL != t->client->handle &&
3855 t->client->handle != client)
3858 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3862 pi = GNUNET_CONTAINER_multihashmap_get (t->peers,
3863 &data_msg->destination.hashPubKey);
3864 /* Is the selected peer in the tunnel? */
3868 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3872 /* Ok, everything is correct, send the message
3873 * (pretend we got it from a mesh peer)
3876 char buf[ntohs (message->size)];
3877 struct GNUNET_MESH_Unicast *copy;
3879 /* Work around const limitation */
3880 copy = (struct GNUNET_MESH_Unicast *) buf;
3881 memcpy (buf, data_msg, size);
3882 copy->oid = my_full_id;
3883 copy->tid = htonl (t->id.tid);
3884 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3885 "MESH: calling generic handler...\n");
3886 handle_mesh_data_unicast (NULL, &my_full_id, ©->header, NULL, 0);
3888 GNUNET_SERVER_receive_done (client, GNUNET_OK);
3894 * Handler for client traffic directed to the origin
3896 * @param cls closure
3897 * @param client identification of the client
3898 * @param message the actual message
3901 handle_local_to_origin (void *cls, struct GNUNET_SERVER_Client *client,
3902 const struct GNUNET_MessageHeader *message)
3904 struct GNUNET_MESH_ToOrigin *data_msg;
3905 struct GNUNET_PeerIdentity id;
3906 struct MeshClient *c;
3907 struct MeshTunnel *t;
3908 MESH_TunnelNumber tid;
3911 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3912 "MESH: Got a ToOrigin request from a client!\n");
3914 /* Sanity check for client registration */
3915 if (NULL == (c = client_get (client)))
3918 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3921 data_msg = (struct GNUNET_MESH_ToOrigin *) message;
3922 /* Sanity check for message size */
3923 size = ntohs (message->size);
3924 if (sizeof (struct GNUNET_MESH_ToOrigin) +
3925 sizeof (struct GNUNET_MessageHeader) > size)
3928 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3932 /* Tunnel exists? */
3933 tid = ntohl (data_msg->tid);
3934 if (tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
3937 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3940 t = tunnel_get_by_local_id (c, tid);
3944 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3948 /* It shouldn't be a local tunnel. */
3949 if (NULL != t->client)
3952 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3955 GNUNET_PEER_resolve (t->id.oid, &id);
3957 /* Ok, everything is correct, send the message
3958 * (pretend we got it from a mesh peer)
3961 char buf[ntohs (message->size)];
3962 struct GNUNET_MESH_ToOrigin *copy;
3964 /* Work around const limitation */
3965 copy = (struct GNUNET_MESH_ToOrigin *) buf;
3966 memcpy (buf, data_msg, size);
3968 copy->tid = htonl (t->id.tid);
3969 copy->sender = my_full_id;
3970 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3971 "MESH: calling generic handler...\n");
3972 handle_mesh_data_to_orig (NULL, &my_full_id, ©->header, NULL, 0);
3974 GNUNET_SERVER_receive_done (client, GNUNET_OK);
3980 * Handler for client traffic directed to all peers in a tunnel
3982 * @param cls closure
3983 * @param client identification of the client
3984 * @param message the actual message
3987 handle_local_multicast (void *cls, struct GNUNET_SERVER_Client *client,
3988 const struct GNUNET_MessageHeader *message)
3990 struct MeshClient *c;
3991 struct MeshTunnel *t;
3992 struct GNUNET_MESH_Multicast *data_msg;
3993 MESH_TunnelNumber tid;
3995 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3996 "MESH: Got a multicast request from a client!\n");
3998 /* Sanity check for client registration */
3999 if (NULL == (c = client_get (client)))
4002 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4005 data_msg = (struct GNUNET_MESH_Multicast *) message;
4006 /* Sanity check for message size */
4007 if (sizeof (struct GNUNET_MESH_Multicast) +
4008 sizeof (struct GNUNET_MessageHeader) > ntohs (data_msg->header.size))
4011 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4015 /* Tunnel exists? */
4016 tid = ntohl (data_msg->tid);
4017 t = tunnel_get_by_local_id (c, tid);
4021 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4025 /* Does client own tunnel? */
4026 if (t->client->handle != client)
4029 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4034 char buf[ntohs (message->size)];
4035 struct GNUNET_MESH_Multicast *copy;
4037 copy = (struct GNUNET_MESH_Multicast *) buf;
4038 memcpy (buf, message, ntohs (message->size));
4039 copy->oid = my_full_id;
4040 copy->tid = htonl (t->id.tid);
4041 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4042 "MESH: calling generic handler...\n");
4043 handle_mesh_data_multicast (client, &my_full_id, ©->header, NULL, 0);
4046 /* receive done gets called when last copy is sent to a neighbor */
4051 * Functions to handle messages from clients
4053 static struct GNUNET_SERVER_MessageHandler client_handlers[] = {
4054 {&handle_local_new_client, NULL,
4055 GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT, 0},
4056 {&handle_local_tunnel_create, NULL,
4057 GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE,
4058 sizeof (struct GNUNET_MESH_TunnelMessage)},
4059 {&handle_local_tunnel_destroy, NULL,
4060 GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY,
4061 sizeof (struct GNUNET_MESH_TunnelMessage)},
4062 {&handle_local_connect_add, NULL,
4063 GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD,
4064 sizeof (struct GNUNET_MESH_PeerControl)},
4065 {&handle_local_connect_del, NULL,
4066 GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_DEL,
4067 sizeof (struct GNUNET_MESH_PeerControl)},
4068 {&handle_local_connect_by_type, NULL,
4069 GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD_BY_TYPE,
4070 sizeof (struct GNUNET_MESH_ConnectPeerByType)},
4071 {&handle_local_unicast, NULL,
4072 GNUNET_MESSAGE_TYPE_MESH_UNICAST, 0},
4073 {&handle_local_to_origin, NULL,
4074 GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN, 0},
4075 {&handle_local_multicast, NULL,
4076 GNUNET_MESSAGE_TYPE_MESH_MULTICAST, 0},
4082 * To be called on core init/fail.
4084 * @param cls service closure
4085 * @param server handle to the server for this service
4086 * @param identity the public identity of this peer
4089 core_init (void *cls, struct GNUNET_CORE_Handle *server,
4090 const struct GNUNET_PeerIdentity *identity)
4092 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Core init\n");
4093 core_handle = server;
4094 if (0 != memcmp (identity, &my_full_id, sizeof (my_full_id)) ||
4097 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, _("MESH: Wrong CORE service\n"));
4098 GNUNET_SCHEDULER_shutdown ();
4104 * Method called whenever a given peer connects.
4106 * @param cls closure
4107 * @param peer peer identity this notification is about
4108 * @param atsi performance data for the connection
4109 * @param atsi_count number of records in 'atsi'
4112 core_connect (void *cls, const struct GNUNET_PeerIdentity *peer,
4113 const struct GNUNET_ATS_Information *atsi,
4114 unsigned int atsi_count)
4116 struct MeshPeerInfo *peer_info;
4117 struct MeshPeerPath *path;
4119 #if MESH_DEBUG_CONNECTION
4120 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Peer connected\n");
4121 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: %s\n",
4122 GNUNET_i2s (&my_full_id));
4124 peer_info = peer_info_get (peer);
4125 if (myid == peer_info->id)
4127 #if MESH_DEBUG_CONNECTION
4128 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: (self)\n");
4132 #if MESH_DEBUG_CONNECTION
4135 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: %s\n", GNUNET_i2s (peer));
4138 path = path_new (2);
4139 path->peers[0] = myid;
4140 path->peers[1] = peer_info->id;
4141 GNUNET_PEER_change_rc (myid, 1);
4142 GNUNET_PEER_change_rc (peer_info->id, 1);
4143 peer_info_add_path (peer_info, path, GNUNET_YES);
4148 * Method called whenever a peer disconnects.
4150 * @param cls closure
4151 * @param peer peer identity this notification is about
4154 core_disconnect (void *cls, const struct GNUNET_PeerIdentity *peer)
4156 struct MeshPeerInfo *pi;
4159 #if MESH_DEBUG_CONNECTION
4160 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Peer disconnected\n");
4162 pi = GNUNET_CONTAINER_multihashmap_get (peers, &peer->hashPubKey);
4168 for (i = 0; i < CORE_QUEUE_SIZE; i++)
4170 /* TODO: notify that the transmission failed */
4171 peer_info_cancel_transmission (pi, i);
4173 peer_info_remove_path (pi, pi->id, myid);
4174 #if MESH_DEBUG_CONNECTION
4177 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: (self)\n");
4184 /******************************************************************************/
4185 /************************ MAIN FUNCTIONS ****************************/
4186 /******************************************************************************/
4189 * Iterator over tunnel hash map entries to destroy the tunnel during shutdown.
4191 * @param cls closure
4192 * @param key current key code
4193 * @param value value in the hash map
4194 * @return GNUNET_YES if we should continue to iterate,
4198 shutdown_tunnel (void *cls, const GNUNET_HashCode * key, void *value)
4200 struct MeshTunnel *t = value;
4207 * Iterator over peer hash map entries to destroy the tunnel during shutdown.
4209 * @param cls closure
4210 * @param key current key code
4211 * @param value value in the hash map
4212 * @return GNUNET_YES if we should continue to iterate,
4216 shutdown_peer (void *cls, const GNUNET_HashCode * key, void *value)
4218 struct MeshPeerInfo *p = value;
4220 peer_info_destroy (p);
4225 * Task run during shutdown.
4231 shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
4233 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: shutting down\n");
4234 /* TODO: destroy tunnels? */
4235 if (core_handle != NULL)
4237 GNUNET_CORE_disconnect (core_handle);
4240 GNUNET_CONTAINER_multihashmap_iterate (tunnels, &shutdown_tunnel, NULL);
4241 GNUNET_CONTAINER_multihashmap_iterate (peers, &shutdown_peer, NULL);
4242 if (dht_handle != NULL)
4244 GNUNET_DHT_disconnect (dht_handle);
4249 GNUNET_SERVER_notification_context_destroy (nc);
4252 if (GNUNET_SCHEDULER_NO_TASK != announce_id_task)
4254 GNUNET_SCHEDULER_cancel (announce_id_task);
4255 announce_id_task = GNUNET_SCHEDULER_NO_TASK;
4257 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: shut down\n");
4261 * Process mesh requests.
4263 * @param cls closure
4264 * @param server the initialized server
4265 * @param c configuration to use
4268 run (void *cls, struct GNUNET_SERVER_Handle *server,
4269 const struct GNUNET_CONFIGURATION_Handle *c)
4271 struct MeshPeerInfo *peer;
4272 struct MeshPeerPath *p;
4275 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: starting to run\n");
4276 server_handle = server;
4277 core_handle = GNUNET_CORE_connect (c, /* Main configuration */
4278 CORE_QUEUE_SIZE, /* queue size */
4279 NULL, /* Closure passed to MESH functions */
4280 &core_init, /* Call core_init once connected */
4281 &core_connect, /* Handle connects */
4282 &core_disconnect, /* remove peers on disconnects */
4283 NULL, /* Don't notify about all incoming messages */
4284 GNUNET_NO, /* For header only in notification */
4285 NULL, /* Don't notify about all outbound messages */
4286 GNUNET_NO, /* For header-only out notification */
4287 core_handlers); /* Register these handlers */
4289 if (core_handle == NULL)
4292 GNUNET_SCHEDULER_shutdown ();
4297 GNUNET_CONFIGURATION_get_value_filename (c, "GNUNETD", "HOSTKEY",
4300 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4302 ("Mesh service is lacking key configuration settings. Exiting.\n"));
4303 GNUNET_SCHEDULER_shutdown ();
4306 my_private_key = GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
4307 GNUNET_free (keyfile);
4308 if (my_private_key == NULL)
4310 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4311 _("Mesh service could not access hostkey. Exiting.\n"));
4312 GNUNET_SCHEDULER_shutdown ();
4315 GNUNET_CRYPTO_rsa_key_get_public (my_private_key, &my_public_key);
4316 GNUNET_CRYPTO_hash (&my_public_key, sizeof (my_public_key),
4317 &my_full_id.hashPubKey);
4318 myid = GNUNET_PEER_intern (&my_full_id);
4320 // // transport_handle = GNUNET_TRANSPORT_connect(c,
4327 dht_handle = GNUNET_DHT_connect (c, 64);
4328 if (dht_handle == NULL)
4334 next_local_tid = GNUNET_MESH_LOCAL_TUNNEL_ID_SERV;
4336 tunnels = GNUNET_CONTAINER_multihashmap_create (32);
4337 incoming_tunnels = GNUNET_CONTAINER_multihashmap_create (32);
4338 peers = GNUNET_CONTAINER_multihashmap_create (32);
4339 applications = GNUNET_CONTAINER_multihashmap_create (32);
4340 types = GNUNET_CONTAINER_multihashmap_create (32);
4342 GNUNET_SERVER_add_handlers (server_handle, client_handlers);
4343 nc = GNUNET_SERVER_notification_context_create (server_handle,
4345 GNUNET_SERVER_disconnect_notify (server_handle,
4346 &handle_local_client_disconnect, NULL);
4350 clients_tail = NULL;
4355 announce_applications_task = GNUNET_SCHEDULER_NO_TASK;
4356 announce_id_task = GNUNET_SCHEDULER_add_now (&announce_id, cls);
4358 /* Create a peer_info for the local peer */
4359 peer = peer_info_get (&my_full_id);
4362 GNUNET_PEER_change_rc (myid, 1);
4363 peer_info_add_path (peer, p, GNUNET_YES);
4365 /* Scheduled the task to clean up when shutdown is called */
4366 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &shutdown_task,
4369 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: end of run()\n");
4373 * The main function for the mesh service.
4375 * @param argc number of arguments from the command line
4376 * @param argv command line arguments
4377 * @return 0 ok, 1 on error
4380 main (int argc, char *const *argv)
4384 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: main()\n");
4387 GNUNET_SERVICE_run (argc, argv, "mesh", GNUNET_SERVICE_OPTION_NONE, &run,
4389 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: main() END\n");