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
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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.
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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
44 * - set ttl relative to tree depth
49 #include "mesh_protocol.h"
50 #include "gnunet_dht_service.h"
51 #include "mesh_tunnel_tree.h"
53 /* TODO: move into configuration file */
54 #define REFRESH_PATH_TIME GNUNET_TIME_relative_multiply(\
55 GNUNET_TIME_UNIT_SECONDS,\
57 #define APP_ANNOUNCE_TIME GNUNET_TIME_relative_multiply(\
58 GNUNET_TIME_UNIT_SECONDS,\
61 #define ID_ANNOUNCE_TIME GNUNET_TIME_relative_multiply(\
62 GNUNET_TIME_UNIT_SECONDS,\
65 #define GET_RESTART_TIME GNUNET_TIME_relative_multiply(\
66 GNUNET_TIME_UNIT_SECONDS,\
69 #define UNACKNOWLEDGED_WAIT GNUNET_TIME_relative_multiply(\
70 GNUNET_TIME_UNIT_SECONDS,\
72 #define DEFAULT_TTL 64
74 #define MESH_DEBUG_DHT GNUNET_NO
78 /******************************************************************************/
79 /************************ DATA STRUCTURES ****************************/
80 /******************************************************************************/
82 /** FWD declaration */
86 * Struct containing all info possibly needed to build a package when called
89 struct MeshDataDescriptor
91 /** ID of the tunnel this packet travels in */
92 struct MESH_TunnelID *origin;
97 /** Client that asked for the transmission, if any */
98 struct GNUNET_SERVER_Client *client;
100 /** Who was this message being sent to */
101 struct MeshPeerInfo *peer;
103 /** Ultimate destination of the packet */
104 GNUNET_PEER_Id destination;
106 /** Number of identical messages sent to different hops (multicast) */
107 unsigned int *copies;
109 /** Which handler was used to request the transmission */
110 unsigned int handler_n;
112 /** Size of the data */
115 /** Used to allow a client send more traffic to the service after a
116 * previous packet was tried to be sent to a neighbor and couldn't */
117 GNUNET_SCHEDULER_TaskIdentifier *timeout_task;
122 * Struct containing all information regarding a given peer
132 * Last time we heard from this peer
134 struct GNUNET_TIME_Absolute last_contact;
137 * Number of attempts to reconnect so far
139 int n_reconnect_attempts;
142 * Paths to reach the peer, ordered by ascending hop count
144 struct MeshPeerPath *path_head;
147 * Paths to reach the peer, ordered by ascending hop count
149 struct MeshPeerPath *path_tail;
152 * Handle to stop the DHT search for a path to this peer
154 struct GNUNET_DHT_GetHandle *dhtget;
157 * Closure given to the DHT GET
159 struct MeshPathInfo *dhtgetcls;
162 * Handles to stop queued transmissions for this peer
164 struct GNUNET_CORE_TransmitHandle *core_transmit[CORE_QUEUE_SIZE];
167 * Pointer to info stuctures used as cls for queued transmissions
169 void *infos[CORE_QUEUE_SIZE];
172 * Type of message being in each transmission
174 uint16_t types[CORE_QUEUE_SIZE];
177 * Array of tunnels this peer participates in
178 * (most probably a small amount, therefore not a hashmap)
179 * When the path to the peer changes, notify these tunnels to let them
180 * re-adjust their path trees.
182 struct MeshTunnel **tunnels;
185 * Number of tunnels this peers participates in
187 unsigned int ntunnels;
192 * Data scheduled to transmit (to local client or remote peer)
199 struct MeshQueue *next;
200 struct MeshQueue *prev;
203 * Target of the data (NULL if target is client)
205 struct MeshPeerInfo *peer;
208 * Client to send the data to (NULL if target is peer)
210 struct MeshClient *client;
213 * Size of the message to transmit
218 * How old is the data?
220 struct GNUNET_TIME_Absolute timestamp;
225 struct GNUNET_MessageHeader *data;
229 * Globally unique tunnel identification (owner + number)
230 * DO NOT USE OVER THE NETWORK
235 * Node that owns the tunnel
240 * Tunnel number to differentiate all the tunnels owned by the node oid
241 * ( tid < GNUNET_MESH_LOCAL_TUNNEL_ID_CLI )
243 MESH_TunnelNumber tid;
247 struct MeshClient; /* FWD declaration */
250 * Struct containing all information regarding a tunnel
251 * For an intermediate node the improtant info used will be:
252 * - id Tunnel unique identification
253 * - paths[0] To know where to send it next
254 * - metainfo: ready, speeds, accounting
261 struct MESH_TunnelID id;
264 * Local tunnel number ( >= GNUNET_MESH_LOCAL_TUNNEL_ID_CLI or 0 )
266 MESH_TunnelNumber local_tid;
269 * ID of the last multicast packet seen/sent.
274 * Last time the tunnel was used
276 struct GNUNET_TIME_Absolute timestamp;
279 * Peers in the tunnel, indexed by PeerIdentity -> (MeshPeerInfo)
280 * containing peers added by id or by type, not intermediate peers.
282 struct GNUNET_CONTAINER_MultiHashMap *peers;
285 * Number of peers that are connected and potentially ready to receive data
287 unsigned int peers_ready;
290 * Number of peers that have been added to the tunnel
292 unsigned int peers_total;
295 * Client owner of the tunnel, if any
297 struct MeshClient *client;
300 * Messages ready to transmit
302 struct MeshQueue *queue_head;
303 struct MeshQueue *queue_tail;
308 struct MeshTunnelTree *tree;
311 * Application type we are looking for in this tunnel
313 GNUNET_MESH_ApplicationType type;
316 * Used to search peers offering a service
318 struct GNUNET_DHT_GetHandle *dht_get_type;
321 * Task to keep the used paths alive
323 GNUNET_SCHEDULER_TaskIdentifier path_refresh_task;
326 * Task to destroy the tunnel after timeout
328 * FIXME: merge the two? a tunnel will have either
329 * a path refresh OR a timeout, never both!
331 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
336 * Info needed to work with tunnel paths and peers
343 struct MeshTunnel *t;
346 * Neighbouring peer to whom we send the packet to
348 struct MeshPeerInfo *peer;
353 struct MeshPeerPath *path;
356 * Position in peer's transmit queue
363 * Struct containing information about a client of the service
370 struct MeshClient *next;
371 struct MeshClient *prev;
374 * Tunnels that belong to this client, indexed by local id
376 struct GNUNET_CONTAINER_MultiHashMap *tunnels;
379 * Handle to communicate with the client
381 struct GNUNET_SERVER_Client *handle;
384 * Applications that this client has claimed to provide
386 struct GNUNET_CONTAINER_MultiHashMap *apps;
389 * Messages that this client has declared interest in
391 struct GNUNET_CONTAINER_MultiHashMap *types;
395 * ID of the client, for debug messages
404 /******************************************************************************/
405 /************************ DEBUG FUNCTIONS ****************************/
406 /******************************************************************************/
410 * GNUNET_SCHEDULER_Task for printing a message after some operation is done
411 * @param cls string to print
412 * @param tc task context
415 mesh_debug (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
419 if (GNUNET_SCHEDULER_REASON_SHUTDOWN == tc->reason)
423 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: %s\n", s);
427 /******************************************************************************/
428 /*********************** GLOBAL VARIABLES ****************************/
429 /******************************************************************************/
434 static struct MeshClient *clients;
435 static struct MeshClient *clients_tail;
438 * Tunnels known, indexed by MESH_TunnelID (MeshTunnel)
440 static struct GNUNET_CONTAINER_MultiHashMap *tunnels;
443 * Tunnels incoming, indexed by MESH_TunnelNumber
444 * (which is greater than GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
446 static struct GNUNET_CONTAINER_MultiHashMap *incoming_tunnels;
449 * Peers known, indexed by PeerIdentity (MeshPeerInfo)
451 static struct GNUNET_CONTAINER_MultiHashMap *peers;
454 * Handle to communicate with core
456 static struct GNUNET_CORE_Handle *core_handle;
459 * Handle to communicate with transport
461 // static struct GNUNET_TRANSPORT_Handle *transport_handle;
466 static struct GNUNET_DHT_Handle *dht_handle;
471 static struct GNUNET_SERVER_Handle *server_handle;
474 * Notification context, to send messages to local clients
476 static struct GNUNET_SERVER_NotificationContext *nc;
479 * Local peer own ID (memory efficient handle)
481 static GNUNET_PEER_Id myid;
484 * Local peer own ID (full value)
486 static struct GNUNET_PeerIdentity my_full_id;
491 static struct GNUNET_CRYPTO_RsaPrivateKey *my_private_key;
496 static struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded my_public_key;
499 * Tunnel ID for the next created tunnel (global tunnel number)
501 static MESH_TunnelNumber next_tid;
504 * Tunnel ID for the next incoming tunnel (local tunnel number)
506 static MESH_TunnelNumber next_local_tid;
509 * All application types provided by this peer
511 static struct GNUNET_CONTAINER_MultiHashMap *applications;
514 * All message types clients of this peer are interested in
516 static struct GNUNET_CONTAINER_MultiHashMap *types;
519 * Task to periodically announce provided applications
521 GNUNET_SCHEDULER_TaskIdentifier announce_applications_task;
524 * Task to periodically announce itself in the network
526 GNUNET_SCHEDULER_TaskIdentifier announce_id_task;
529 unsigned int next_client_id;
533 /******************************************************************************/
534 /************************ ITERATORS ****************************/
535 /******************************************************************************/
537 /* FIXME move iterators here */
540 /******************************************************************************/
541 /************************ PERIODIC FUNCTIONS ****************************/
542 /******************************************************************************/
545 * Announce iterator over for each application provided by the peer
548 * @param key current key code
549 * @param value value in the hash map
550 * @return GNUNET_YES if we should continue to
555 announce_application (void *cls, const GNUNET_HashCode * key, void *value)
557 /* FIXME are hashes in multihash map equal on all aquitectures? */
558 GNUNET_DHT_put (dht_handle, key, 10U,
559 GNUNET_DHT_RO_RECORD_ROUTE |
560 GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE, GNUNET_BLOCK_TYPE_TEST,
561 sizeof (struct GNUNET_PeerIdentity),
562 (const char *) &my_full_id,
564 GNUNET_TIME_UNIT_FOREVER_ABS, GNUNET_TIME_UNIT_FOREVER_REL,
565 &mesh_debug, "DHT_put for app completed");
567 GNUNET_TIME_absolute_add (GNUNET_TIME_absolute_get (),
569 APP_ANNOUNCE_TIME, NULL, NULL);
576 * Periodically announce what applications are provided by local clients
579 * @param tc task context
582 announce_applications (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
584 if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN)
586 announce_applications_task = GNUNET_SCHEDULER_NO_TASK;
590 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Starting PUT for apps\n");
592 GNUNET_CONTAINER_multihashmap_iterate (applications, &announce_application,
594 announce_applications_task =
595 GNUNET_SCHEDULER_add_delayed (APP_ANNOUNCE_TIME, &announce_applications,
598 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Finished PUT for apps\n");
605 * Periodically announce self id in the DHT
608 * @param tc task context
611 announce_id (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
613 if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN)
615 announce_id_task = GNUNET_SCHEDULER_NO_TASK;
619 * - Set data expiration in function of X
623 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: DHT_put for ID %s started.\n",
624 GNUNET_i2s (&my_full_id));
626 GNUNET_DHT_put (dht_handle, /* DHT handle */
627 &my_full_id.hashPubKey, /* Key to use */
628 10U, /* Replication level */
629 GNUNET_DHT_RO_RECORD_ROUTE | GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE, /* DHT options */
630 GNUNET_BLOCK_TYPE_TEST, /* Block type */
631 sizeof (my_full_id), /* Size of the data */
632 (char *) &my_full_id, /* Data itself */
633 GNUNET_TIME_absolute_get_forever (), /* Data expiration */
634 GNUNET_TIME_UNIT_FOREVER_REL, /* Retry time */
636 &mesh_debug, "DHT_put for id completed");
638 NULL, /* Continuation */
639 NULL); /* Continuation closure */
642 GNUNET_SCHEDULER_add_delayed (ID_ANNOUNCE_TIME, &announce_id, cls);
647 * Function to process paths received for a new peer addition. The recorded
648 * paths form the initial tunnel, which can be optimized later.
649 * Called on each result obtained for the DHT search.
652 * @param exp when will this value expire
653 * @param key key of the result
654 * @param type type of the result
655 * @param size number of bytes in data
656 * @param data pointer to the result data
659 dht_get_id_handler (void *cls, struct GNUNET_TIME_Absolute exp,
660 const GNUNET_HashCode * key,
661 const struct GNUNET_PeerIdentity *get_path,
662 unsigned int get_path_length,
663 const struct GNUNET_PeerIdentity *put_path,
664 unsigned int put_path_length, enum GNUNET_BLOCK_Type type,
665 size_t size, const void *data);
668 /******************************************************************************/
669 /****************** GENERAL HELPER FUNCTIONS ************************/
670 /******************************************************************************/
673 * Check if client has registered with the service and has not disconnected
675 * @param client the client to check
677 * @return non-NULL if client exists in the global DLL
679 static struct MeshClient *
680 client_get (struct GNUNET_SERVER_Client *client)
682 struct MeshClient *c;
687 if (c->handle == client)
696 * Checks if a given client has subscribed to certain message type
698 * @param message_type Type of message to check
699 * @param c Client to check
701 * @return GNUNET_YES or GNUNET_NO, depending on subscription status
706 client_is_subscribed (uint16_t message_type, struct MeshClient *c)
710 GNUNET_CRYPTO_hash (&message_type, sizeof (uint16_t), &hc);
711 return GNUNET_CONTAINER_multihashmap_contains (c->types, &hc);
716 * Allow a client to send more data after transmitting a multicast message
717 * which some neighbor has not yet accepted altough a reasonable time has
720 * @param cls Closure (DataDescriptor containing the task identifier)
721 * @param tc Task Context
724 client_allow_send (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
726 struct MeshDataDescriptor *info = cls;
728 if (GNUNET_SCHEDULER_REASON_SHUTDOWN == tc->reason)
731 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
732 "MESH: CLIENT ALLOW SEND DESPITE %u COPIES PENDING\n",
735 *(info->timeout_task) = GNUNET_SCHEDULER_NO_TASK;
736 GNUNET_SERVER_receive_done (info->client, GNUNET_OK);
741 * Search for a tunnel by global ID using full PeerIdentities
743 * @param oid owner of the tunnel
744 * @param tid global tunnel number
746 * @return tunnel handler, NULL if doesn't exist
748 static struct MeshTunnel *
749 tunnel_get (struct GNUNET_PeerIdentity *oid, MESH_TunnelNumber tid);
753 * Notify a tunnel that a connection has broken that affects at least
756 * @param t Tunnel affected.
757 * @param p1 Peer that got disconnected from p2.
758 * @param p2 Peer that got disconnected from p1.
760 * @return Short ID of the peer disconnected (either p1 or p2).
761 * 0 if the tunnel remained unaffected.
763 static GNUNET_PEER_Id
764 tunnel_notify_connection_broken (struct MeshTunnel *t, GNUNET_PEER_Id p1,
769 * Send the message to all clients that have subscribed to its type
771 * @param msg Pointer to the message itself
772 * @return number of clients this message was sent to
775 send_subscribed_clients (const struct GNUNET_MessageHeader *msg,
776 const struct GNUNET_MessageHeader *payload)
778 struct GNUNET_PeerIdentity *oid;
779 struct MeshClient *c;
780 struct MeshTunnel *t;
781 MESH_TunnelNumber *tid;
784 char cbuf[htons (msg->size)];
786 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Sending to clients...\n");
787 type = ntohs (payload->type);
788 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: message of type %u\n", type);
790 memcpy (cbuf, msg, sizeof (cbuf));
791 switch (htons (msg->type))
793 struct GNUNET_MESH_Unicast *uc;
794 struct GNUNET_MESH_Multicast *mc;
795 struct GNUNET_MESH_ToOrigin *to;
797 case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
798 uc = (struct GNUNET_MESH_Unicast *) cbuf;
802 case GNUNET_MESSAGE_TYPE_MESH_MULTICAST:
803 mc = (struct GNUNET_MESH_Multicast *) cbuf;
807 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
808 to = (struct GNUNET_MESH_ToOrigin *) cbuf;
816 t = tunnel_get (oid, ntohl (*tid));
822 *tid = htonl (t->local_tid);
823 for (count = 0, c = clients; c != NULL; c = c->next)
826 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: client %u\n", c->id);
828 if (client_is_subscribed (type, c))
831 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: sending\n");
832 GNUNET_SERVER_notification_context_unicast (nc, c->handle,
833 (struct GNUNET_MessageHeader
834 *) cbuf, GNUNET_YES);
842 * Notify the client that owns the tunnel that a peer has connected to it
843 * (the requested path to it has been confirmed).
845 * @param t Tunnel whose owner to notify
846 * @param id Short id of the peer that has connected
849 send_client_peer_connected (const struct MeshTunnel *t, const GNUNET_PEER_Id id)
851 struct GNUNET_MESH_PeerControl pc;
853 pc.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD);
854 pc.header.size = htons (sizeof (struct GNUNET_MESH_PeerControl));
855 pc.tunnel_id = htonl (t->local_tid);
856 GNUNET_PEER_resolve (id, &pc.peer);
857 GNUNET_SERVER_notification_context_unicast (nc, t->client->handle, &pc.header,
863 * Notify all clients (not depending on registration status) that the incoming
864 * tunnel is no longer valid.
866 * @param t Tunnel that was destroyed.
869 send_clients_tunnel_destroy (struct MeshTunnel *t)
871 struct GNUNET_MESH_TunnelMessage msg;
873 msg.header.size = htons (sizeof (msg));
874 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY);
875 msg.tunnel_id = htonl (t->local_tid);
876 GNUNET_SERVER_notification_context_broadcast (nc, &msg.header, GNUNET_NO);
881 * Function called to notify a client about the socket
882 * being ready to queue more data. "buf" will be
883 * NULL and "size" zero if the socket was closed for
884 * writing in the meantime.
887 * @param size number of bytes available in buf
888 * @param buf where the callee should write the message
889 * @return number of bytes written to buf
892 send_core_create_path (void *cls, size_t size, void *buf);
896 * Function called to notify a client about the socket
897 * being ready to queue more data. "buf" will be
898 * NULL and "size" zero if the socket was closed for
899 * writing in the meantime.
901 * @param cls closure (data itself)
902 * @param size number of bytes available in buf
903 * @param buf where the callee should write the message
905 * @return number of bytes written to buf
908 send_core_data_multicast (void *cls, size_t size, void *buf);
912 * Decrements the reference counter and frees all resources if needed
914 * @param dd Data Descriptor used in a multicast message
917 data_descriptor_decrement_multicast (struct MeshDataDescriptor *dd)
919 if (0 == --(*(dd->copies)))
921 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Last copy!\n");
922 if (NULL != dd->client)
924 if (GNUNET_SCHEDULER_NO_TASK != *(dd->timeout_task))
926 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
927 "MESH: cancelling client timeout (%u)...\n",
928 *(dd->timeout_task));
929 GNUNET_SCHEDULER_cancel (*(dd->timeout_task));
930 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: notifying client...\n");
931 GNUNET_SERVER_receive_done (dd->client, GNUNET_OK);
933 GNUNET_free (dd->timeout_task);
935 GNUNET_free (dd->copies);
936 GNUNET_free (dd->data);
942 * Cancel a core transmission that was already requested and free all resources
943 * associated to the request.
945 * @param peer PeeInfo of the peer whose transmission is cancelled.
946 * @param i Position of the transmission to be cancelled.
949 peer_info_cancel_transmission (struct MeshPeerInfo *peer, unsigned int i)
951 if (NULL != peer->core_transmit[i])
953 struct MeshDataDescriptor *dd;
954 struct MeshPathInfo *path_info;
958 struct GNUNET_PeerIdentity id;
960 GNUNET_PEER_resolve (peer->id, &id);
961 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
962 "MESH: Cancelling data transmission at %s [%u]\n",
963 GNUNET_i2s (&id), i);
964 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: message type %u\n",
968 /* TODO: notify that tranmission has failed */
969 switch (peer->types[i])
971 case GNUNET_MESSAGE_TYPE_MESH_MULTICAST:
972 case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
973 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
974 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: type payload\n");
976 data_descriptor_decrement_multicast (dd);
978 case GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE:
979 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: type create path\n");
980 path_info = peer->infos[i];
981 path_destroy (path_info->path);
985 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: type unknown!\n");
987 GNUNET_CORE_notify_transmit_ready_cancel (peer->core_transmit[i]);
988 peer->core_transmit[i] = NULL;
989 GNUNET_free (peer->infos[i]);
995 * Get a unused CORE slot to transmit a message to a peer. If all the slots
996 * are used, cancel one and return it's position.
998 * @param peer PeerInfo of the neighbor we want to transmit to.
1000 * @return The index of an available slot to transmit to the neighbor.
1003 peer_info_transmit_slot (struct MeshPeerInfo *peer)
1007 for (i = 0; peer->core_transmit[i]; i++)
1009 if (i == (CORE_QUEUE_SIZE - 1))
1011 /* All positions are taken! Overwriting! */
1013 peer_info_cancel_transmission (peer, 0);
1022 * Retrieve the MeshPeerInfo stucture associated with the peer, create one
1023 * and insert it in the appropiate structures if the peer is not known yet.
1025 * @param peer Full identity of the peer.
1027 * @return Existing or newly created peer info.
1029 static struct MeshPeerInfo *
1030 peer_info_get (const struct GNUNET_PeerIdentity *peer)
1032 struct MeshPeerInfo *peer_info;
1034 peer_info = GNUNET_CONTAINER_multihashmap_get (peers, &peer->hashPubKey);
1035 if (NULL == peer_info)
1038 (struct MeshPeerInfo *) GNUNET_malloc (sizeof (struct MeshPeerInfo));
1039 GNUNET_CONTAINER_multihashmap_put (peers, &peer->hashPubKey, peer_info,
1040 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
1041 peer_info->id = GNUNET_PEER_intern (peer);
1049 * Retrieve the MeshPeerInfo stucture associated with the peer, create one
1050 * and insert it in the appropiate structures if the peer is not known yet.
1052 * @param peer Short identity of the peer.
1054 * @return Existing or newly created peer info.
1056 static struct MeshPeerInfo *
1057 peer_info_get_short (const GNUNET_PEER_Id peer)
1059 struct GNUNET_PeerIdentity id;
1061 GNUNET_PEER_resolve (peer, &id);
1062 return peer_info_get (&id);
1067 * Iterator to remove the tunnel from the list of tunnels a peer participates
1070 * @param cls Closure (tunnel info)
1071 * @param key GNUNET_PeerIdentity of the peer (unused)
1072 * @param value PeerInfo of the peer
1074 * @return always GNUNET_YES, to keep iterating
1077 peer_info_delete_tunnel (void *cls, const GNUNET_HashCode * key, void *value)
1079 struct MeshTunnel *t = cls;
1080 struct MeshPeerInfo *peer = value;
1083 for (i = 0; i < peer->ntunnels; i++)
1086 memcmp (&peer->tunnels[i]->id, &t->id, sizeof (struct MESH_TunnelID)))
1089 peer->tunnels[i] = peer->tunnels[peer->ntunnels];
1090 peer->tunnels = GNUNET_realloc (peer->tunnels, peer->ntunnels);
1099 * Core callback to write a
1101 * @param cls Closure (MeshDataDescriptor with data in "data" member).
1102 * @param size Number of bytes available in buf.
1103 * @param buf Where the to write the message.
1105 * @return number of bytes written to buf
1108 send_core_data_raw (void *cls, size_t size, void *buf)
1110 struct MeshDataDescriptor *info = cls;
1111 struct GNUNET_MessageHeader *msg;
1114 GNUNET_assert (NULL != info);
1115 GNUNET_assert (NULL != info->data);
1116 msg = (struct GNUNET_MessageHeader *) info->data;
1117 total_size = ntohs (msg->size);
1119 if (total_size > size)
1121 struct GNUNET_PeerIdentity id;
1123 GNUNET_PEER_resolve (info->peer->id, &id);
1124 info->peer->core_transmit[info->handler_n] =
1125 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 100,
1126 GNUNET_TIME_UNIT_FOREVER_REL, &id,
1127 size, &send_core_data_raw, info);
1130 info->peer->core_transmit[info->handler_n] = NULL;
1131 memcpy (buf, msg, total_size);
1132 GNUNET_free (info->data);
1139 * Sends an already built message to a peer, properly registrating
1140 * all used resources.
1142 * @param message Message to send. Fucntion makes a copy of it.
1143 * @param peer Short ID of the neighbor whom to send the message.
1146 send_message (const struct GNUNET_MessageHeader *message,
1147 const struct GNUNET_PeerIdentity *peer)
1149 struct MeshDataDescriptor *info;
1150 struct MeshPeerInfo *neighbor;
1151 struct MeshPeerPath *p;
1155 // GNUNET_TRANSPORT_try_connect();
1157 size = ntohs (message->size);
1158 info = GNUNET_malloc (sizeof (struct MeshDataDescriptor));
1159 info->data = GNUNET_malloc (size);
1160 memcpy (info->data, message, size);
1161 neighbor = peer_info_get (peer);
1162 for (p = neighbor->path_head; NULL != p; p = p->next)
1175 i = peer_info_transmit_slot (neighbor);
1176 info->handler_n = i;
1177 info->peer = neighbor;
1178 neighbor->types[i] = GNUNET_MESSAGE_TYPE_MESH_UNICAST;
1179 neighbor->infos[i] = info;
1180 neighbor->core_transmit[i] =
1181 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 100,
1182 GNUNET_TIME_UNIT_FOREVER_REL, peer,
1183 size, &send_core_data_raw, info);
1189 * Sends a CREATE PATH message for a path to a peer, properly registrating
1190 * all used resources.
1192 * @param peer PeerInfo of the final peer for whom this path is being created.
1193 * @param p Path itself.
1194 * @param t Tunnel for which the path is created.
1197 send_create_path (struct MeshPeerInfo *peer, struct MeshPeerPath *p,
1198 struct MeshTunnel *t)
1200 struct GNUNET_PeerIdentity id;
1201 struct MeshPathInfo *path_info;
1202 struct MeshPeerInfo *neighbor;
1207 p = tree_get_path_to_peer (t->tree, peer->id);
1214 for (i = 0; i < p->length; i++)
1216 if (p->peers[i] == myid)
1219 if (i >= p->length - 1)
1225 GNUNET_PEER_resolve (p->peers[i + 1], &id);
1227 path_info = GNUNET_malloc (sizeof (struct MeshPathInfo));
1228 path_info->path = p;
1230 neighbor = peer_info_get (&id);
1231 path_info->peer = neighbor;
1232 path_info->pos = peer_info_transmit_slot (neighbor);
1233 neighbor->types[path_info->pos] = GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE;
1234 neighbor->infos[path_info->pos] = path_info;
1235 neighbor->core_transmit[path_info->pos] = GNUNET_CORE_notify_transmit_ready (core_handle, /* handle */
1238 GNUNET_TIME_UNIT_FOREVER_REL, /* timeout */
1240 sizeof (struct GNUNET_MESH_ManipulatePath) + (p->length * sizeof (struct GNUNET_PeerIdentity)), /*size */
1241 &send_core_create_path, /* callback */
1242 path_info); /* cls */
1247 * Sends a DESTROY PATH message to free resources for a path in a tunnel
1249 * @param t Tunnel whose path to destroy.
1250 * @param destination Short ID of the peer to whom the path to destroy.
1253 send_destroy_path (struct MeshTunnel *t, GNUNET_PEER_Id destination)
1255 struct MeshPeerPath *p;
1258 p = tree_get_path_to_peer (t->tree, destination);
1264 size = sizeof (struct GNUNET_MESH_ManipulatePath);
1265 size += p->length * sizeof (struct GNUNET_PeerIdentity);
1267 struct GNUNET_MESH_ManipulatePath *msg;
1268 struct GNUNET_PeerIdentity *pi;
1272 msg = (struct GNUNET_MESH_ManipulatePath *) cbuf;
1273 msg->header.size = htons (size);
1274 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_DESTROY);
1275 msg->tid = htonl (t->id.tid);
1276 pi = (struct GNUNET_PeerIdentity *) &msg[1];
1277 for (i = 0; i < p->length; i++)
1279 GNUNET_PEER_resolve (p->peers[i], &pi[i]);
1281 send_message (&msg->header, tree_get_first_hop (t->tree, destination));
1288 * Try to establish a new connection to this peer.
1289 * Use the best path for the given tunnel.
1290 * If the peer doesn't have any path to it yet, try to get one.
1291 * If the peer already has some path, send a CREATE PATH towards it.
1293 * @param peer PeerInfo of the peer.
1294 * @param t Tunnel for which to create the path, if possible.
1297 peer_info_connect (struct MeshPeerInfo *peer, struct MeshTunnel *t)
1299 struct MeshPeerPath *p;
1300 struct MeshPathInfo *path_info;
1302 if (NULL != peer->path_head)
1304 p = tree_get_path_to_peer (t->tree, peer->id);
1313 send_create_path (peer, p, t);
1318 send_client_peer_connected (t, myid);
1321 else if (NULL == peer->dhtget)
1323 struct GNUNET_PeerIdentity id;
1325 GNUNET_PEER_resolve (peer->id, &id);
1326 path_info = GNUNET_malloc (sizeof (struct MeshPathInfo));
1327 path_info->peer = peer;
1329 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1330 "MESH: Starting DHT GET for peer %s\n", GNUNET_i2s (&id));
1331 peer->dhtgetcls = path_info;
1332 peer->dhtget = GNUNET_DHT_get_start (dht_handle, /* handle */
1333 GNUNET_TIME_UNIT_FOREVER_REL, /* timeout */
1334 GNUNET_BLOCK_TYPE_TEST, /* type */
1335 &id.hashPubKey, /* key to search */
1336 4, /* replication level */
1337 GNUNET_DHT_RO_RECORD_ROUTE | GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE, NULL, /* xquery */
1338 0, /* xquery bits */
1339 &dht_get_id_handler, path_info);
1341 /* Otherwise, there is no path but the DHT get is already started. */
1346 * Task to delay the connection of a peer
1348 * @param cls Closure (path info with tunnel and peer to connect).
1349 * Will be free'd on exection.
1350 * @param tc TaskContext
1353 peer_info_connect_task (void *cls,
1354 const struct GNUNET_SCHEDULER_TaskContext *tc)
1356 struct MeshPathInfo *path_info = cls;
1358 if (0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
1363 peer_info_connect (path_info->peer, path_info->t);
1369 * Destroy the peer_info and free any allocated resources linked to it
1371 * @param pi The peer_info to destroy.
1373 * @return GNUNET_OK on success
1376 peer_info_destroy (struct MeshPeerInfo *pi)
1378 struct GNUNET_PeerIdentity id;
1379 struct MeshPeerPath *p;
1380 struct MeshPeerPath *nextp;
1383 GNUNET_PEER_resolve (pi->id, &id);
1384 GNUNET_PEER_change_rc (pi->id, -1);
1387 GNUNET_CONTAINER_multihashmap_remove (peers, &id.hashPubKey, pi))
1390 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1391 "MESH: removing peer %s, not in hashmap\n", GNUNET_i2s (&id));
1393 if (NULL != pi->dhtget)
1395 GNUNET_DHT_get_stop (pi->dhtget);
1396 GNUNET_free (pi->dhtgetcls);
1398 for (i = 0; i < CORE_QUEUE_SIZE; i++)
1400 peer_info_cancel_transmission (pi, i);
1406 GNUNET_CONTAINER_DLL_remove (pi->path_head, pi->path_tail, p);
1416 * Remove all paths that rely on a direct connection between p1 and p2
1417 * from the peer itself and notify all tunnels about it.
1419 * @param peer PeerInfo of affected peer.
1420 * @param p1 GNUNET_PEER_Id of one peer.
1421 * @param p2 GNUNET_PEER_Id of another peer that was connected to the first and
1424 * TODO: optimize (see below)
1427 peer_info_remove_path (struct MeshPeerInfo *peer, GNUNET_PEER_Id p1,
1430 struct MeshPeerPath *p;
1431 struct MeshPeerPath *aux;
1432 struct MeshPeerInfo *peer_d;
1434 unsigned int destroyed;
1440 p = peer->path_head;
1444 for (i = 0; i < (p->length - 1); i++)
1446 if ((p->peers[i] == p1 && p->peers[i + 1] == p2) ||
1447 (p->peers[i] == p2 && p->peers[i + 1] == p1))
1449 GNUNET_CONTAINER_DLL_remove (peer->path_head, peer->path_tail, p);
1460 for (i = 0; i < peer->ntunnels; i++)
1462 d = tunnel_notify_connection_broken (peer->tunnels[i], p1, p2);
1463 if (0 == d) continue;
1465 * Problem: one or more peers have been deleted from the tunnel tree.
1466 * We don't know who they are to try to add them again.
1467 * We need to try to find a new path for each of the disconnected peers.
1468 * Some of them might already have a path to reach them that does not
1469 * involve p1 and p2. Adding all anew might render in a better tree than
1470 * the trivial immediate fix.
1472 * Trivial immiediate fix: try to reconnect to the disconnected node. All
1473 * its children will be reachable trough him.
1475 peer_d = peer_info_get_short (d);
1478 for (p = peer_d->path_head; NULL != p; p = p->next)
1480 if ((cost = tree_get_path_cost (peer->tunnels[i]->tree, p)) < best)
1488 /* No callback, as peer will be already disconnected and a connection
1489 * scheduled by tunnel_notify_connection_broken.
1491 tree_add_path (peer->tunnels[i]->tree, aux, NULL, NULL);
1495 peer_info_connect (peer_d, peer->tunnels[i]);
1502 * Add the path to the peer and update the path used to reach it in case this
1505 * @param peer_info Destination peer to add the path to.
1506 * @param path New path to add. Last peer must be the peer in arg 1.
1507 * Path will be either used of freed if already known.
1508 * @param trusted Do we trust that this path is real?
1511 peer_info_add_path (struct MeshPeerInfo *peer_info, struct MeshPeerPath *path,
1514 struct MeshPeerPath *aux;
1518 if ((NULL == peer_info) || (NULL == path))
1521 path_destroy (path);
1524 if (path->peers[path->length - 1] != peer_info->id)
1527 path_destroy (path);
1530 if (path->length <= 2 && GNUNET_NO == trusted)
1532 /* Only allow CORE to tell us about direct paths */
1533 path_destroy (path);
1536 GNUNET_assert (peer_info->id == path->peers[path->length - 1]);
1537 for (l = 1; l < path->length; l++)
1539 if (path->peers[l] == myid)
1541 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: shortening path by %u\n", l);
1542 for (l2 = 0; l2 < path->length - l; l2++)
1544 path->peers[l2] = path->peers[l + l2];
1549 GNUNET_realloc (path->peers, path->length * sizeof (GNUNET_PEER_Id));
1554 struct GNUNET_PeerIdentity id;
1556 GNUNET_PEER_resolve (peer_info->id, &id);
1557 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: adding path [%u] to peer %s\n",
1558 path->length, GNUNET_i2s (&id));
1561 l = path_get_length (path);
1568 GNUNET_assert (peer_info->id == path->peers[path->length - 1]);
1569 for (aux = peer_info->path_head; aux != NULL; aux = aux->next)
1571 l2 = path_get_length (aux);
1574 GNUNET_CONTAINER_DLL_insert_before (peer_info->path_head,
1575 peer_info->path_tail, aux, path);
1580 if (l2 == l && memcmp (path->peers, aux->peers, l) == 0)
1582 path_destroy (path);
1587 GNUNET_CONTAINER_DLL_insert_tail (peer_info->path_head, peer_info->path_tail,
1594 * Add the path to the origin peer and update the path used to reach it in case
1595 * this is the shortest.
1596 * The path is given in peer_info -> destination, therefore we turn the path
1597 * upside down first.
1599 * @param peer_info Peer to add the path to, being the origin of the path.
1600 * @param path New path to add after being inversed.
1601 * @param trusted Do we trust that this path is real?
1604 peer_info_add_path_to_origin (struct MeshPeerInfo *peer_info,
1605 struct MeshPeerPath *path, int trusted)
1608 peer_info_add_path (peer_info, path, trusted);
1613 * Build a PeerPath from the paths returned from the DHT, reversing the paths
1614 * to obtain a local peer -> destination path and interning the peer ids.
1616 * @return Newly allocated and created path
1618 static struct MeshPeerPath *
1619 path_build_from_dht (const struct GNUNET_PeerIdentity *get_path,
1620 unsigned int get_path_length,
1621 const struct GNUNET_PeerIdentity *put_path,
1622 unsigned int put_path_length)
1624 struct MeshPeerPath *p;
1630 GNUNET_PEER_change_rc (myid, 1);
1631 i = get_path_length;
1632 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: GET has %d hops.\n", i);
1633 for (i--; i >= 0; i--)
1635 id = GNUNET_PEER_intern (&get_path[i]);
1636 if (p->length > 0 && id == p->peers[p->length - 1])
1638 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Optimizing 1 hop out.\n");
1639 GNUNET_PEER_change_rc (id, -1);
1643 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Adding from GET: %s.\n",
1644 GNUNET_i2s (&get_path[i]));
1646 p->peers = GNUNET_realloc (p->peers, sizeof (GNUNET_PEER_Id) * p->length);
1647 p->peers[p->length - 1] = id;
1650 i = put_path_length;
1651 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: PUT has %d hops.\n", i);
1652 for (i--; i >= 0; i--)
1654 id = GNUNET_PEER_intern (&put_path[i]);
1657 /* PUT path went through us, so discard the path up until now and start
1658 * from here to get a much shorter (and loop-free) path.
1663 if (p->length > 0 && id == p->peers[p->length - 1])
1665 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Optimizing 1 hop out.\n");
1666 GNUNET_PEER_change_rc (id, -1);
1670 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Adding from PUT: %s.\n",
1671 GNUNET_i2s (&put_path[i]));
1673 p->peers = GNUNET_realloc (p->peers, sizeof (GNUNET_PEER_Id) * p->length);
1674 p->peers[p->length - 1] = id;
1678 if (get_path_length > 0)
1679 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: (first of GET: %s)\n",
1680 GNUNET_i2s (&get_path[0]));
1681 if (put_path_length > 0)
1682 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: (first of PUT: %s)\n",
1683 GNUNET_i2s (&put_path[0]));
1684 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: In total: %d hops\n",
1686 for (i = 0; i < p->length; i++)
1688 struct GNUNET_PeerIdentity peer_id;
1690 GNUNET_PEER_resolve (p->peers[i], &peer_id);
1691 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: %u: %s\n", p->peers[i],
1692 GNUNET_i2s (&peer_id));
1700 * Send keepalive packets for a peer
1702 * @param cls Closure (tunnel for which to send the keepalive).
1703 * @param tc Notification context.
1705 * TODO: implement explicit multicast keepalive?
1708 path_refresh (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
1712 * Search for a tunnel among the incoming tunnels
1714 * @param tid the local id of the tunnel
1716 * @return tunnel handler, NULL if doesn't exist
1718 static struct MeshTunnel *
1719 tunnel_get_incoming (MESH_TunnelNumber tid)
1721 GNUNET_HashCode hash;
1723 GNUNET_assert (tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV);
1724 GNUNET_CRYPTO_hash (&tid, sizeof (MESH_TunnelNumber), &hash);
1725 return GNUNET_CONTAINER_multihashmap_get (incoming_tunnels, &hash);
1730 * Search for a tunnel among the tunnels for a client
1732 * @param c the client whose tunnels to search in
1733 * @param tid the local id of the tunnel
1735 * @return tunnel handler, NULL if doesn't exist
1737 static struct MeshTunnel *
1738 tunnel_get_by_local_id (struct MeshClient *c, MESH_TunnelNumber tid)
1740 if (tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
1742 return tunnel_get_incoming (tid);
1746 GNUNET_HashCode hash;
1748 GNUNET_CRYPTO_hash (&tid, sizeof (MESH_TunnelNumber), &hash);
1749 return GNUNET_CONTAINER_multihashmap_get (c->tunnels, &hash);
1755 * Search for a tunnel by global ID using PEER_ID
1757 * @param pi owner of the tunnel
1758 * @param tid global tunnel number
1760 * @return tunnel handler, NULL if doesn't exist
1762 static struct MeshTunnel *
1763 tunnel_get_by_pi (GNUNET_PEER_Id pi, MESH_TunnelNumber tid)
1765 struct MESH_TunnelID id;
1766 GNUNET_HashCode hash;
1771 GNUNET_CRYPTO_hash (&id, sizeof (struct MESH_TunnelID), &hash);
1772 return GNUNET_CONTAINER_multihashmap_get (tunnels, &hash);
1777 * Search for a tunnel by global ID using full PeerIdentities
1779 * @param oid owner of the tunnel
1780 * @param tid global tunnel number
1782 * @return tunnel handler, NULL if doesn't exist
1784 static struct MeshTunnel *
1785 tunnel_get (struct GNUNET_PeerIdentity *oid, MESH_TunnelNumber tid)
1787 return tunnel_get_by_pi (GNUNET_PEER_search (oid), tid);
1792 * Callback used to notify a client owner of a tunnel that a peer has
1793 * disconnected, most likely because of a path change.
1795 * @param cls Closure (tunnel this notification is about).
1796 * @param peer_id Short ID of disconnected peer.
1799 notify_peer_disconnected (void *cls, GNUNET_PEER_Id peer_id)
1801 struct MeshTunnel *t = cls;
1802 struct MeshPeerInfo *peer;
1803 struct MeshPathInfo *path_info;
1805 if (NULL != t->client && NULL != nc)
1807 struct GNUNET_MESH_PeerControl msg;
1809 msg.header.size = htons (sizeof (msg));
1810 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_DEL);
1811 msg.tunnel_id = htonl (t->local_tid);
1812 GNUNET_PEER_resolve (peer_id, &msg.peer);
1813 GNUNET_SERVER_notification_context_unicast (nc, t->client->handle,
1814 &msg.header, GNUNET_NO);
1816 peer = peer_info_get_short (peer_id);
1817 path_info = GNUNET_malloc (sizeof (struct MeshPathInfo));
1818 path_info->peer = peer;
1820 GNUNET_SCHEDULER_add_now (&peer_info_connect_task, path_info);
1825 * Add a peer to a tunnel, accomodating paths accordingly and initializing all
1826 * needed rescources.
1827 * If peer already exists, reevaluate shortest path and change if different.
1829 * @param t Tunnel we want to add a new peer to
1830 * @param peer PeerInfo of the peer being added
1834 tunnel_add_peer (struct MeshTunnel *t, struct MeshPeerInfo *peer)
1836 struct GNUNET_PeerIdentity id;
1837 struct MeshPeerPath *best_p;
1838 struct MeshPeerPath *p;
1839 unsigned int best_cost;
1842 GNUNET_PEER_resolve (peer->id, &id);
1844 GNUNET_CONTAINER_multihashmap_contains (t->peers, &id.hashPubKey))
1847 GNUNET_array_append (peer->tunnels, peer->ntunnels, t);
1848 GNUNET_assert (GNUNET_OK ==
1849 GNUNET_CONTAINER_multihashmap_put (t->peers, &id.hashPubKey,
1851 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST));
1854 if (NULL != (p = peer->path_head))
1857 best_cost = tree_get_path_cost (t->tree, p);
1860 if ((cost = tree_get_path_cost (t->tree, p)) < best_cost)
1867 tree_add_path (t->tree, best_p, ¬ify_peer_disconnected, t);
1868 if (GNUNET_SCHEDULER_NO_TASK == t->path_refresh_task)
1869 t->path_refresh_task =
1870 GNUNET_SCHEDULER_add_delayed (REFRESH_PATH_TIME, &path_refresh, t);
1874 /* Start a DHT get */
1875 peer_info_connect (peer, t);
1880 * Add a path to a tunnel which we don't own, just to remember the next hop.
1881 * If destination node was already in the tunnel, the first hop information
1882 * will be replaced with the new path.
1884 * @param t Tunnel we want to add a new peer to
1885 * @param p Path to add
1886 * @param own_pos Position of local node in path.
1890 tunnel_add_path (struct MeshTunnel *t, struct MeshPeerPath *p,
1891 unsigned int own_pos)
1893 struct GNUNET_PeerIdentity id;
1895 GNUNET_assert (0 != own_pos);
1896 tree_add_path (t->tree, p, NULL, NULL);
1897 if (own_pos < p->length - 1)
1899 GNUNET_PEER_resolve (p->peers[own_pos + 1], &id);
1900 tree_update_first_hops (t->tree, myid, &id);
1906 * Notifies a tunnel that a connection has broken that affects at least
1907 * some of its peers. Sends a notification towards the root of the tree.
1908 * In case the peer is the owner of the tree, notifies the client that owns
1909 * the tunnel and tries to reconnect.
1911 * @param t Tunnel affected.
1912 * @param p1 Peer that got disconnected from p2.
1913 * @param p2 Peer that got disconnected from p1.
1915 * @return Short ID of the peer disconnected (either p1 or p2).
1916 * 0 if the tunnel remained unaffected.
1918 static GNUNET_PEER_Id
1919 tunnel_notify_connection_broken (struct MeshTunnel *t, GNUNET_PEER_Id p1,
1925 tree_notify_connection_broken (t->tree, p1, p2, ¬ify_peer_disconnected,
1927 if (myid != p1 && myid != p2)
1933 if (tree_get_predecessor (t->tree) != 0)
1935 /* We are the peer still connected, notify owner of the disconnection. */
1936 struct GNUNET_MESH_PathBroken msg;
1937 struct GNUNET_PeerIdentity neighbor;
1939 msg.header.size = htons (sizeof (msg));
1940 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_BROKEN);
1941 GNUNET_PEER_resolve (t->id.oid, &msg.oid);
1942 msg.tid = htonl (t->id.tid);
1943 msg.peer1 = my_full_id;
1944 GNUNET_PEER_resolve (pid, &msg.peer2);
1945 GNUNET_PEER_resolve (tree_get_predecessor (t->tree), &neighbor);
1946 send_message (&msg.header, &neighbor);
1953 struct MeshMulticastData
1955 struct MeshTunnel *t;
1957 GNUNET_SCHEDULER_TaskIdentifier *task;
1959 unsigned int *reference_counter;
1968 * Send a multicast packet to a neighbor.
1971 tunnel_send_multicast_iterator (void *cls, GNUNET_PEER_Id neighbor_id)
1973 struct MeshMulticastData *mdata = cls;
1974 struct MeshDataDescriptor *info;
1975 struct GNUNET_PeerIdentity neighbor;
1978 info = GNUNET_malloc (sizeof (struct MeshDataDescriptor));
1980 info->data = mdata->data;
1981 info->size = mdata->data_len;
1982 info->copies = mdata->reference_counter;
1983 (*(mdata->reference_counter))++;
1985 if (NULL != mdata->t->client)
1987 info->client = mdata->t->client->handle;
1988 info->timeout_task = mdata->task;
1990 info->destination = neighbor_id;
1991 GNUNET_PEER_resolve (neighbor_id, &neighbor);
1993 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: sending to %s...\n",
1994 GNUNET_i2s (&neighbor));
1996 info->peer = peer_info_get (&neighbor);
1997 GNUNET_assert (NULL != info->peer);
1998 i = peer_info_transmit_slot (info->peer);
1999 info->handler_n = i;
2000 info->peer->infos[i] = info;
2001 info->peer->types[i] = GNUNET_MESSAGE_TYPE_MESH_MULTICAST;
2002 info->peer->core_transmit[i] =
2003 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0,
2004 GNUNET_TIME_UNIT_FOREVER_REL,
2005 &neighbor, info->size,
2006 &send_core_data_multicast, info);
2010 * Send a message in a tunnel in multicast, sending a copy to each child node
2011 * down the local one in the tunnel tree.
2013 * @param t Tunnel in which to send the data.
2014 * @param msg Message to be sent
2017 tunnel_send_multicast (struct MeshTunnel *t,
2018 const struct GNUNET_MessageHeader *msg)
2020 struct MeshMulticastData *mdata;
2023 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2024 "MESH: sending a multicast packet...\n");
2026 mdata = GNUNET_malloc (sizeof (struct MeshMulticastData));
2027 mdata->data_len = ntohs (msg->size);
2028 mdata->reference_counter = GNUNET_malloc (sizeof (unsigned int));
2030 mdata->data = GNUNET_malloc (mdata->data_len);
2031 memcpy (mdata->data, msg, mdata->data_len);
2032 if (ntohs (msg->type) == GNUNET_MESSAGE_TYPE_MESH_MULTICAST)
2034 struct GNUNET_MESH_Multicast *mcast;
2036 mcast = (struct GNUNET_MESH_Multicast *) mdata->data;
2037 mcast->ttl = htonl (ntohl (mcast->ttl) - 1);
2039 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2040 "MESH: data packet, ttl: %u\n",
2041 ntohl (mcast->ttl));
2045 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2046 "MESH: not a data packet, no ttl\n");
2049 if (NULL != t->client)
2051 mdata->task = GNUNET_malloc (sizeof (GNUNET_SCHEDULER_TaskIdentifier));
2053 GNUNET_SCHEDULER_add_delayed (UNACKNOWLEDGED_WAIT, &client_allow_send,
2057 tree_iterate_children (t->tree, &tunnel_send_multicast_iterator, mdata);
2058 if (*(mdata->reference_counter) == 0)
2060 GNUNET_free (mdata->data);
2061 GNUNET_free (mdata->reference_counter);
2062 if (NULL != mdata->task)
2064 GNUNET_free (mdata->task);
2067 GNUNET_free (mdata);
2069 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2070 "MESH: sending a multicast packet done\n");
2077 * Send a message to all peers in this tunnel that the tunnel is no longer
2080 * @param t The tunnel whose peers to notify.
2083 tunnel_send_destroy (struct MeshTunnel *t)
2085 struct GNUNET_MESH_TunnelDestroy msg;
2087 msg.header.size = htons (sizeof (msg));
2088 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY);
2089 GNUNET_PEER_resolve (t->id.oid, &msg.oid);
2090 msg.tid = htonl (t->id.tid);
2091 tunnel_send_multicast (t, &msg.header);
2097 * Destroy the tunnel and free any allocated resources linked to it
2099 * @param t the tunnel to destroy
2101 * @return GNUNET_OK on success
2104 tunnel_destroy (struct MeshTunnel *t)
2106 struct MeshClient *c;
2107 struct MeshQueue *q;
2108 struct MeshQueue *qn;
2109 GNUNET_HashCode hash;
2118 struct GNUNET_PeerIdentity id;
2120 GNUNET_PEER_resolve (t->id.oid, &id);
2121 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: destroying tunnel %s [%x]\n",
2122 GNUNET_i2s (&id), t->id.tid);
2124 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: by client %u\n", c->id);
2128 GNUNET_CRYPTO_hash (&t->id, sizeof (struct MESH_TunnelID), &hash);
2129 if (GNUNET_YES != GNUNET_CONTAINER_multihashmap_remove (tunnels, &hash, t))
2134 GNUNET_CRYPTO_hash (&t->local_tid, sizeof (MESH_TunnelNumber), &hash);
2136 GNUNET_YES != GNUNET_CONTAINER_multihashmap_remove (c->tunnels, &hash, t))
2140 if (t->local_tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
2142 GNUNET_CRYPTO_hash (&t->local_tid, sizeof (MESH_TunnelNumber), &hash);
2143 GNUNET_break (GNUNET_YES ==
2144 GNUNET_CONTAINER_multihashmap_remove (incoming_tunnels, &hash,
2147 if (NULL != t->peers)
2149 GNUNET_CONTAINER_multihashmap_iterate (t->peers, &peer_info_delete_tunnel,
2151 GNUNET_CONTAINER_multihashmap_destroy (t->peers);
2156 if (NULL != q->data)
2157 GNUNET_free (q->data);
2161 /* TODO cancel core transmit ready in case it was active */
2163 tree_destroy (t->tree);
2164 if (NULL != t->dht_get_type)
2165 GNUNET_DHT_get_stop (t->dht_get_type);
2166 if (GNUNET_SCHEDULER_NO_TASK != t->timeout_task)
2167 GNUNET_SCHEDULER_cancel (t->timeout_task);
2168 if (GNUNET_SCHEDULER_NO_TASK != t->path_refresh_task)
2169 GNUNET_SCHEDULER_cancel (t->path_refresh_task);
2176 * Removes an explicit path from a tunnel, freeing all intermediate nodes
2177 * that are no longer needed, as well as nodes of no longer reachable peers.
2178 * The tunnel itself is also destoyed if results in a remote empty tunnel.
2180 * @param t Tunnel from which to remove the path.
2181 * @param p Peer which should be removed.
2184 tunnel_delete_peer (struct MeshTunnel *t, GNUNET_PEER_Id peer)
2186 if (GNUNET_NO == tree_del_peer (t->tree, peer, NULL, NULL))
2192 * tunnel_destroy_iterator: iterator for deleting each tunnel that belongs to a
2193 * client when the client disconnects.
2195 * @param cls closure (client that is disconnecting)
2196 * @param key the hash of the local tunnel id (used to access the hashmap)
2197 * @param value the value stored at the key (tunnel to destroy)
2199 * @return GNUNET_OK on success
2202 tunnel_destroy_iterator (void *cls, const GNUNET_HashCode * key, void *value)
2204 struct MeshTunnel *t = value;
2207 r = tunnel_destroy (t);
2213 * Timeout function, destroys tunnel if called
2215 * @param cls Closure (tunnel to destroy).
2216 * @param tc TaskContext
2219 tunnel_timeout (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
2221 struct MeshTunnel *t = cls;
2223 if (GNUNET_SCHEDULER_REASON_SHUTDOWN == tc->reason)
2225 t->timeout_task = GNUNET_SCHEDULER_NO_TASK;
2230 * Resets the tunnel timeout. Starts it if no timeout was running.
2232 * @param t Tunnel whose timeout to reset.
2235 tunnel_reset_timeout (struct MeshTunnel *t)
2237 if (GNUNET_SCHEDULER_NO_TASK != t->timeout_task)
2238 GNUNET_SCHEDULER_cancel (t->timeout_task);
2240 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_multiply
2241 (REFRESH_PATH_TIME, 4), &tunnel_timeout, t);
2245 /******************************************************************************/
2246 /**************** MESH NETWORK HANDLER HELPERS ***********************/
2247 /******************************************************************************/
2250 * Function called to notify a client about the socket
2251 * being ready to queue more data. "buf" will be
2252 * NULL and "size" zero if the socket was closed for
2253 * writing in the meantime.
2255 * @param cls closure
2256 * @param size number of bytes available in buf
2257 * @param buf where the callee should write the message
2258 * @return number of bytes written to buf
2261 send_core_create_path (void *cls, size_t size, void *buf)
2263 struct MeshPathInfo *info = cls;
2264 struct GNUNET_MESH_ManipulatePath *msg;
2265 struct GNUNET_PeerIdentity *peer_ptr;
2266 struct MeshPeerInfo *peer = info->peer;
2267 struct MeshTunnel *t = info->t;
2268 struct MeshPeerPath *p = info->path;
2272 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: CREATE PATH sending...\n");
2274 sizeof (struct GNUNET_MESH_ManipulatePath) +
2275 p->length * sizeof (struct GNUNET_PeerIdentity);
2277 if (size < size_needed || NULL == buf)
2279 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: create path retransmit!\n");
2280 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: buf: %p\n", buf);
2281 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: size: (%u/%u)\n", size,
2283 info->peer->core_transmit[info->pos] =
2284 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0,
2285 GNUNET_TIME_UNIT_FOREVER_REL,
2286 tree_get_first_hop (t->tree,
2288 size_needed, &send_core_create_path,
2292 info->peer->core_transmit[info->pos] = NULL;
2295 struct GNUNET_PeerIdentity id;
2297 GNUNET_PEER_resolve (peer->id, &id);
2298 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2299 "MESH: setting core_transmit %s [%u] to NULL\n",
2300 GNUNET_i2s (&id), info->pos);
2303 msg = (struct GNUNET_MESH_ManipulatePath *) buf;
2304 msg->header.size = htons (size_needed);
2305 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE);
2306 msg->tid = ntohl (t->id.tid);
2308 peer_ptr = (struct GNUNET_PeerIdentity *) &msg[1];
2309 for (i = 0; i < p->length; i++)
2311 GNUNET_PEER_resolve (p->peers[i], peer_ptr++);
2317 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2318 "MESH: CREATE PATH (%u bytes long) sent!\n", size_needed);
2324 * Function called to notify a client about the socket
2325 * being ready to queue more data. "buf" will be
2326 * NULL and "size" zero if the socket was closed for
2327 * writing in the meantime.
2329 * @param cls closure (data itself)
2330 * @param size number of bytes available in buf
2331 * @param buf where the callee should write the message
2333 * @return number of bytes written to buf
2336 send_core_data_multicast (void *cls, size_t size, void *buf)
2338 struct MeshDataDescriptor *info = cls;
2341 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Multicast callback.\n");
2342 GNUNET_assert (NULL != info);
2343 GNUNET_assert (NULL != info->peer);
2344 total_size = info->size;
2345 GNUNET_assert (total_size < GNUNET_SERVER_MAX_MESSAGE_SIZE);
2347 if (total_size > size)
2350 struct GNUNET_PeerIdentity id;
2352 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2353 "MESH: Multicast: retransmitting... (%u/%u)\n", size,
2355 GNUNET_PEER_resolve (info->peer->id, &id);
2356 info->peer->core_transmit[info->handler_n] =
2357 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0,
2358 GNUNET_TIME_UNIT_FOREVER_REL, &id,
2360 &send_core_data_multicast, info);
2363 info->peer->core_transmit[info->handler_n] = NULL;
2364 info->peer->infos[info->handler_n] = NULL;
2365 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: copying data...\n");
2366 memcpy (buf, info->data, total_size);
2369 struct GNUNET_MESH_Multicast *mc;
2370 struct GNUNET_MessageHeader *mh;
2373 if (ntohs (mh->type) == GNUNET_MESSAGE_TYPE_MESH_MULTICAST)
2375 mc = (struct GNUNET_MESH_Multicast *) mh;
2376 mh = (struct GNUNET_MessageHeader *) &mc[1];
2377 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2378 "MESH: multicast, payload type %u\n", ntohs (mh->type));
2379 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2380 "MESH: multicast, payload size %u\n", ntohs (mh->size));
2384 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: type %u\n",
2389 data_descriptor_decrement_multicast (info);
2390 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: freeing info...\n");
2392 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: return %u\n", total_size);
2398 * Function called to notify a client about the socket
2399 * being ready to queue more data. "buf" will be
2400 * NULL and "size" zero if the socket was closed for
2401 * writing in the meantime.
2403 * @param cls closure (MeshDataDescriptor)
2404 * @param size number of bytes available in buf
2405 * @param buf where the callee should write the message
2406 * @return number of bytes written to buf
2409 send_core_path_ack (void *cls, size_t size, void *buf)
2411 struct MeshDataDescriptor *info = cls;
2412 struct GNUNET_MESH_PathACK *msg = buf;
2414 GNUNET_assert (NULL != info);
2417 info->peer->core_transmit[info->handler_n] = NULL;
2419 if (sizeof (struct GNUNET_MESH_PathACK) > size)
2424 msg->header.size = htons (sizeof (struct GNUNET_MESH_PathACK));
2425 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_ACK);
2426 GNUNET_PEER_resolve (info->origin->oid, &msg->oid);
2427 msg->tid = htonl (info->origin->tid);
2428 msg->peer_id = my_full_id;
2430 /* TODO add signature */
2432 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: PATH ACK sent!\n");
2433 return sizeof (struct GNUNET_MESH_PathACK);
2437 /******************************************************************************/
2438 /******************** MESH NETWORK HANDLERS **************************/
2439 /******************************************************************************/
2443 * Core handler for path creation
2445 * @param cls closure
2446 * @param message message
2447 * @param peer peer identity this notification is about
2448 * @param atsi performance data
2449 * @param atsi_count number of records in 'atsi'
2451 * @return GNUNET_OK to keep the connection open,
2452 * GNUNET_SYSERR to close it (signal serious error)
2455 handle_mesh_path_create (void *cls, const struct GNUNET_PeerIdentity *peer,
2456 const struct GNUNET_MessageHeader *message,
2457 const struct GNUNET_ATS_Information *atsi,
2458 unsigned int atsi_count)
2460 unsigned int own_pos;
2463 MESH_TunnelNumber tid;
2464 struct GNUNET_MESH_ManipulatePath *msg;
2465 struct GNUNET_PeerIdentity *pi;
2466 GNUNET_HashCode hash;
2467 struct MeshPeerPath *path;
2468 struct MeshPeerInfo *dest_peer_info;
2469 struct MeshPeerInfo *orig_peer_info;
2470 struct MeshTunnel *t;
2472 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2473 "MESH: Received a path create msg [%s]\n",
2474 GNUNET_i2s (&my_full_id));
2475 size = ntohs (message->size);
2476 if (size < sizeof (struct GNUNET_MESH_ManipulatePath))
2478 GNUNET_break_op (0);
2482 size -= sizeof (struct GNUNET_MESH_ManipulatePath);
2483 if (size % sizeof (struct GNUNET_PeerIdentity))
2485 GNUNET_break_op (0);
2488 size /= sizeof (struct GNUNET_PeerIdentity);
2491 GNUNET_break_op (0);
2494 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: path has %u hops.\n", size);
2495 msg = (struct GNUNET_MESH_ManipulatePath *) message;
2497 tid = ntohl (msg->tid);
2498 pi = (struct GNUNET_PeerIdentity *) &msg[1];
2499 t = tunnel_get (pi, tid);
2500 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2501 "MESH: path is for tunnel %s [%X].\n", GNUNET_i2s (pi), tid);
2504 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Creating tunnel\n");
2505 t = GNUNET_malloc (sizeof (struct MeshTunnel));
2506 t->id.oid = GNUNET_PEER_intern (pi);
2508 while (NULL != tunnel_get_incoming (next_local_tid))
2509 next_local_tid = (next_local_tid + 1) | GNUNET_MESH_LOCAL_TUNNEL_ID_SERV;
2510 t->local_tid = next_local_tid++;
2511 next_local_tid = next_local_tid | GNUNET_MESH_LOCAL_TUNNEL_ID_SERV;
2512 t->tree = tree_new (t->id.oid);
2514 GNUNET_CRYPTO_hash (&t->id, sizeof (struct MESH_TunnelID), &hash);
2516 GNUNET_CONTAINER_multihashmap_put (tunnels, &hash, t,
2517 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST))
2523 tunnel_reset_timeout (t);
2524 GNUNET_CRYPTO_hash (&t->local_tid, sizeof (MESH_TunnelNumber), &hash);
2526 GNUNET_CONTAINER_multihashmap_put (incoming_tunnels, &hash, t,
2527 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST))
2535 GNUNET_CONTAINER_multihashmap_get (peers, &pi[size - 1].hashPubKey);
2536 if (NULL == dest_peer_info)
2538 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2539 "MESH: Creating PeerInfo for destination.\n");
2540 dest_peer_info = GNUNET_malloc (sizeof (struct MeshPeerInfo));
2541 dest_peer_info->id = GNUNET_PEER_intern (&pi[size - 1]);
2542 GNUNET_CONTAINER_multihashmap_put (peers, &pi[size - 1].hashPubKey,
2544 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
2546 orig_peer_info = GNUNET_CONTAINER_multihashmap_get (peers, &pi->hashPubKey);
2547 if (NULL == orig_peer_info)
2549 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2550 "MESH: Creating PeerInfo for origin.\n");
2551 orig_peer_info = GNUNET_malloc (sizeof (struct MeshPeerInfo));
2552 orig_peer_info->id = GNUNET_PEER_intern (pi);
2553 GNUNET_CONTAINER_multihashmap_put (peers, &pi->hashPubKey, orig_peer_info,
2554 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
2556 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Creating path...\n");
2557 path = path_new (size);
2559 for (i = 0; i < size; i++)
2561 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: ... adding %s\n",
2562 GNUNET_i2s (&pi[i]));
2563 path->peers[i] = GNUNET_PEER_intern (&pi[i]);
2564 if (path->peers[i] == myid)
2567 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Own position: %u\n", own_pos);
2570 /* cannot be self, must be 'not found' */
2571 /* create path: self not found in path through self */
2572 GNUNET_break_op (0);
2573 path_destroy (path);
2574 /* FIXME error. destroy tunnel? leave for timeout? */
2577 tunnel_add_path (t, path, own_pos);
2578 if (own_pos == size - 1)
2580 /* It is for us! Send ack. */
2581 struct MeshDataDescriptor *info;
2584 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: It's for us!\n");
2585 peer_info_add_path_to_origin (orig_peer_info, path, GNUNET_NO);
2586 if (NULL == t->peers)
2588 /* New tunnel! Notify clients! */
2589 struct GNUNET_MESH_TunnelNotification cmsg;
2591 cmsg.header.size = htons (sizeof (cmsg));
2592 cmsg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE);
2593 GNUNET_PEER_resolve (t->id.oid, &cmsg.peer);
2594 cmsg.tunnel_id = htonl (t->local_tid);
2595 GNUNET_SERVER_notification_context_broadcast (nc, &cmsg.header,
2598 t->peers = GNUNET_CONTAINER_multihashmap_create (4);
2600 GNUNET_break (GNUNET_OK ==
2601 GNUNET_CONTAINER_multihashmap_put (t->peers,
2602 &my_full_id.hashPubKey,
2605 GNUNET_CONTAINER_MULTIHASHMAPOPTION_REPLACE));
2606 /* FIXME use send_message */
2607 info = GNUNET_malloc (sizeof (struct MeshDataDescriptor));
2608 info->origin = &t->id;
2609 info->peer = GNUNET_CONTAINER_multihashmap_get (peers, &peer->hashPubKey);
2610 GNUNET_assert (NULL != info->peer);
2611 j = peer_info_transmit_slot (info->peer);
2612 info->handler_n = j;
2613 info->peer->types[j] = GNUNET_MESSAGE_TYPE_MESH_PATH_ACK;
2614 info->peer->infos[j] = info;
2615 info->peer->core_transmit[j] =
2616 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 100,
2617 GNUNET_TIME_UNIT_FOREVER_REL, peer,
2618 sizeof (struct GNUNET_MESH_PathACK),
2619 &send_core_path_ack, info);
2623 struct MeshPeerPath *path2;
2625 /* It's for somebody else! Retransmit. */
2626 path2 = path_duplicate (path);
2627 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Retransmitting.\n");
2628 peer_info_add_path (dest_peer_info, path2, GNUNET_NO);
2629 path2 = path_duplicate (path);
2630 peer_info_add_path_to_origin (orig_peer_info, path2, GNUNET_NO);
2631 send_create_path (dest_peer_info, path, t);
2638 * Core handler for path destruction
2640 * @param cls closure
2641 * @param message message
2642 * @param peer peer identity this notification is about
2643 * @param atsi performance data
2644 * @param atsi_count number of records in 'atsi'
2646 * @return GNUNET_OK to keep the connection open,
2647 * GNUNET_SYSERR to close it (signal serious error)
2650 handle_mesh_path_destroy (void *cls, const struct GNUNET_PeerIdentity *peer,
2651 const struct GNUNET_MessageHeader *message,
2652 const struct GNUNET_ATS_Information *atsi,
2653 unsigned int atsi_count)
2655 struct GNUNET_MESH_ManipulatePath *msg;
2656 struct GNUNET_PeerIdentity *pi;
2657 struct MeshPeerPath *path;
2658 struct MeshTunnel *t;
2659 unsigned int own_pos;
2663 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2664 "MESH: Received a PATH DESTROY msg from %s\n", GNUNET_i2s (peer));
2665 size = ntohs (message->size);
2666 if (size < sizeof (struct GNUNET_MESH_ManipulatePath))
2668 GNUNET_break_op (0);
2672 size -= sizeof (struct GNUNET_MESH_ManipulatePath);
2673 if (size % sizeof (struct GNUNET_PeerIdentity))
2675 GNUNET_break_op (0);
2678 size /= sizeof (struct GNUNET_PeerIdentity);
2681 GNUNET_break_op (0);
2684 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: path has %u hops.\n", size);
2686 msg = (struct GNUNET_MESH_ManipulatePath *) message;
2687 pi = (struct GNUNET_PeerIdentity *) &msg[1];
2688 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2689 "MESH: path is for tunnel %s [%X].\n", GNUNET_i2s (pi),
2691 t = tunnel_get (pi, ntohl (msg->tid));
2694 /* TODO notify back: we don't know this tunnel */
2695 GNUNET_break_op (0);
2698 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Creating path...\n");
2699 path = path_new (size);
2701 for (i = 0; i < size; i++)
2703 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: ... adding %s\n",
2704 GNUNET_i2s (&pi[i]));
2705 path->peers[i] = GNUNET_PEER_intern (&pi[i]);
2706 if (path->peers[i] == myid)
2709 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Own position: %u\n", own_pos);
2710 if (own_pos < path->length - 1)
2711 send_message (message, &pi[own_pos + 1]);
2712 tunnel_delete_peer (t, path->peers[path->length - 1]);
2713 path_destroy (path);
2719 * Core handler for notifications of broken paths
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_path_broken (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_PathBroken *msg;
2737 struct MeshTunnel *t;
2739 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2740 "MESH: Received a PATH BROKEN msg from %s\n", GNUNET_i2s (peer));
2741 msg = (struct GNUNET_MESH_PathBroken *) message;
2742 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: regarding %s\n",
2743 GNUNET_i2s (&msg->peer1));
2744 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: regarding %s\n",
2745 GNUNET_i2s (&msg->peer2));
2746 t = tunnel_get (&msg->oid, ntohl (msg->tid));
2749 GNUNET_break_op (0);
2752 tunnel_notify_connection_broken (t, GNUNET_PEER_search (&msg->peer1),
2753 GNUNET_PEER_search (&msg->peer2));
2760 * Core handler for tunnel destruction
2762 * @param cls closure
2763 * @param message message
2764 * @param peer peer identity this notification is about
2765 * @param atsi performance data
2766 * @param atsi_count number of records in 'atsi'
2768 * @return GNUNET_OK to keep the connection open,
2769 * GNUNET_SYSERR to close it (signal serious error)
2772 handle_mesh_tunnel_destroy (void *cls, const struct GNUNET_PeerIdentity *peer,
2773 const struct GNUNET_MessageHeader *message,
2774 const struct GNUNET_ATS_Information *atsi,
2775 unsigned int atsi_count)
2777 struct GNUNET_MESH_TunnelDestroy *msg;
2778 struct MeshTunnel *t;
2780 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2781 "MESH: Got a TUNNEL DESTROY packet from %s\n", GNUNET_i2s (peer));
2782 msg = (struct GNUNET_MESH_TunnelDestroy *) message;
2783 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: for tunnel %s [%u]\n",
2784 GNUNET_i2s (&msg->oid), ntohl (msg->tid));
2785 t = tunnel_get (&msg->oid, ntohl (msg->tid));
2788 /* Probably already got the message from another path,
2789 * destroyed the tunnel and retransmitted to children.
2794 if (t->id.oid == myid)
2796 GNUNET_break_op (0);
2799 if (t->local_tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
2801 /* Tunnel was incoming, notify clients */
2802 send_clients_tunnel_destroy (t);
2804 tunnel_send_destroy (t);
2811 * Core handler for mesh network traffic going from the origin to a peer
2813 * @param cls closure
2814 * @param peer peer identity this notification is about
2815 * @param message message
2816 * @param atsi performance data
2817 * @param atsi_count number of records in 'atsi'
2818 * @return GNUNET_OK to keep the connection open,
2819 * GNUNET_SYSERR to close it (signal serious error)
2822 handle_mesh_data_unicast (void *cls, const struct GNUNET_PeerIdentity *peer,
2823 const struct GNUNET_MessageHeader *message,
2824 const struct GNUNET_ATS_Information *atsi,
2825 unsigned int atsi_count)
2827 struct GNUNET_MESH_Unicast *msg;
2828 struct MeshTunnel *t;
2832 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: got a unicast packet from %s\n",
2834 size = ntohs (message->size);
2836 sizeof (struct GNUNET_MESH_Unicast) +
2837 sizeof (struct GNUNET_MessageHeader))
2842 msg = (struct GNUNET_MESH_Unicast *) message;
2843 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: of type %u\n",
2844 ntohs (msg[1].header.type));
2845 t = tunnel_get (&msg->oid, ntohl (msg->tid));
2848 /* TODO notify back: we don't know this tunnel */
2849 GNUNET_break_op (0);
2852 tunnel_reset_timeout (t);
2853 pid = GNUNET_PEER_search (&msg->destination);
2856 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2857 "MESH: it's for us! sending to clients...\n");
2858 send_subscribed_clients (message, (struct GNUNET_MessageHeader *) &msg[1]);
2861 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2862 "MESH: not for us, retransmitting...\n");
2863 send_message (message, tree_get_first_hop (t->tree, pid));
2869 * Core handler for mesh network traffic going from the origin to all peers
2871 * @param cls closure
2872 * @param message message
2873 * @param peer peer identity this notification is about
2874 * @param atsi performance data
2875 * @param atsi_count number of records in 'atsi'
2876 * @return GNUNET_OK to keep the connection open,
2877 * GNUNET_SYSERR to close it (signal serious error)
2879 * TODO: Check who we got this from, to validate route.
2882 handle_mesh_data_multicast (void *cls, const struct GNUNET_PeerIdentity *peer,
2883 const struct GNUNET_MessageHeader *message,
2884 const struct GNUNET_ATS_Information *atsi,
2885 unsigned int atsi_count)
2887 struct GNUNET_MESH_Multicast *msg;
2888 struct MeshTunnel *t;
2891 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: got a multicast packet from %s\n",
2893 size = ntohs (message->size);
2894 if (sizeof (struct GNUNET_MESH_Multicast) +
2895 sizeof (struct GNUNET_MessageHeader) > size)
2897 GNUNET_break_op (0);
2900 msg = (struct GNUNET_MESH_Multicast *) message;
2901 t = tunnel_get (&msg->oid, ntohl (msg->tid));
2905 /* TODO notify that we dont know that tunnel */
2906 GNUNET_break_op (0);
2909 if (t->mid == ntohl (msg->mid))
2911 /* FIXME: already seen this packet, log dropping */
2912 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2913 "MESH: Already seen mid %u, DROPPING!\n",
2920 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2921 "MESH: mid %u not seen yet, forwarding\n",
2925 t->mid = ntohl (msg->mid);
2926 tunnel_reset_timeout (t);
2928 /* Transmit to locally interested clients */
2929 if (NULL != t->peers &&
2930 GNUNET_CONTAINER_multihashmap_contains (t->peers, &my_full_id.hashPubKey))
2932 send_subscribed_clients (message, &msg[1].header);
2935 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2939 if (ntohl (msg->ttl) == 0)
2941 /* FIXME: ttl is 0, log dropping */
2942 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2943 "MESH: TTL is 0, DROPPING!\n");
2946 tunnel_send_multicast (t, message);
2952 * Core handler for mesh network traffic toward the owner of a tunnel
2954 * @param cls closure
2955 * @param message message
2956 * @param peer peer identity this notification is about
2957 * @param atsi performance data
2958 * @param atsi_count number of records in 'atsi'
2960 * @return GNUNET_OK to keep the connection open,
2961 * GNUNET_SYSERR to close it (signal serious error)
2964 handle_mesh_data_to_orig (void *cls, const struct GNUNET_PeerIdentity *peer,
2965 const struct GNUNET_MessageHeader *message,
2966 const struct GNUNET_ATS_Information *atsi,
2967 unsigned int atsi_count)
2969 struct GNUNET_MESH_ToOrigin *msg;
2970 struct GNUNET_PeerIdentity id;
2971 struct MeshPeerInfo *peer_info;
2972 struct MeshTunnel *t;
2975 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: got a ToOrigin packet from %s\n",
2977 size = ntohs (message->size);
2978 if (size < sizeof (struct GNUNET_MESH_ToOrigin) + /* Payload must be */
2979 sizeof (struct GNUNET_MessageHeader)) /* at least a header */
2981 GNUNET_break_op (0);
2984 msg = (struct GNUNET_MESH_ToOrigin *) message;
2985 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: of type %u\n",
2986 ntohs (msg[1].header.type));
2987 t = tunnel_get (&msg->oid, ntohl (msg->tid));
2991 /* TODO notify that we dont know this tunnel (whom)? */
2992 GNUNET_break_op (0);
2996 if (t->id.oid == myid)
2999 struct GNUNET_MESH_ToOrigin *copy;
3001 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3002 "MESH: it's for us! sending to clients...\n");
3003 if (NULL == t->client)
3005 /* got data packet for ownerless tunnel */
3006 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: no clients!\n");
3007 GNUNET_break_op (0);
3010 /* TODO signature verification */
3011 memcpy (cbuf, message, size);
3012 copy = (struct GNUNET_MESH_ToOrigin *) cbuf;
3013 copy->tid = htonl (t->local_tid);
3014 GNUNET_SERVER_notification_context_unicast (nc, t->client->handle,
3015 ©->header, GNUNET_YES);
3018 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3019 "MESH: not for us, retransmitting...\n");
3021 peer_info = peer_info_get (&msg->oid);
3022 if (NULL == peer_info)
3024 /* unknown origin of tunnel */
3028 GNUNET_PEER_resolve (tree_get_predecessor (t->tree), &id);
3029 send_message (message, &id);
3036 * Core handler for path ACKs
3038 * @param cls closure
3039 * @param message message
3040 * @param peer peer identity this notification is about
3041 * @param atsi performance data
3042 * @param atsi_count number of records in 'atsi'
3044 * @return GNUNET_OK to keep the connection open,
3045 * GNUNET_SYSERR to close it (signal serious error)
3048 handle_mesh_path_ack (void *cls, const struct GNUNET_PeerIdentity *peer,
3049 const struct GNUNET_MessageHeader *message,
3050 const struct GNUNET_ATS_Information *atsi,
3051 unsigned int atsi_count)
3053 struct GNUNET_MESH_PathACK *msg;
3054 struct GNUNET_PeerIdentity id;
3055 struct MeshPeerInfo *peer_info;
3056 struct MeshPeerPath *p;
3057 struct MeshTunnel *t;
3060 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Received a path ACK msg [%s]\n",
3061 GNUNET_i2s (&my_full_id));
3062 msg = (struct GNUNET_MESH_PathACK *) message;
3063 t = tunnel_get (&msg->oid, msg->tid);
3066 /* TODO notify that we don't know the tunnel */
3070 /* Add paths to peers */
3071 peer_info = peer_info_get (&msg->peer_id);
3072 p = tree_get_path_to_peer(t->tree, peer_info->id);
3075 for (i = 1; i < p->length && p->peers[i] != myid; i++) /* skip'em */;
3076 for (i++; i < p->length; i++)
3078 struct MeshPeerInfo *aux;
3079 struct MeshPeerPath *copy;
3081 aux = peer_info_get_short(p->peers[i]);
3082 copy = path_duplicate(p);
3084 peer_info_add_path(aux, copy, 0);
3093 /* Message for us? */
3094 if (0 == memcmp (&msg->oid, &my_full_id, sizeof (struct GNUNET_PeerIdentity)))
3096 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: It's for us!\n");
3097 if (NULL == t->client)
3099 GNUNET_break_op (0);
3102 if (NULL != t->dht_get_type)
3104 GNUNET_DHT_get_stop (t->dht_get_type);
3105 t->dht_get_type = NULL;
3107 if (tree_get_status(t->tree, peer_info->id) != MESH_PEER_READY)
3109 tree_set_status (t->tree, peer_info->id, MESH_PEER_READY);
3110 send_client_peer_connected (t, peer_info->id);
3115 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3116 "MESH: not for us, retransmitting...\n");
3117 GNUNET_PEER_resolve (tree_get_predecessor (t->tree), &id);
3118 peer_info = peer_info_get (&msg->oid);
3119 if (NULL == peer_info)
3121 /* If we know the tunnel, we should DEFINITELY know the peer */
3125 send_message (message, &id);
3131 * Functions to handle messages from core
3133 static struct GNUNET_CORE_MessageHandler core_handlers[] = {
3134 {&handle_mesh_path_create, GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE, 0},
3135 {&handle_mesh_path_destroy, GNUNET_MESSAGE_TYPE_MESH_PATH_DESTROY, 0},
3136 {&handle_mesh_path_broken, GNUNET_MESSAGE_TYPE_MESH_PATH_BROKEN,
3137 sizeof (struct GNUNET_MESH_PathBroken)},
3138 {&handle_mesh_tunnel_destroy, GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY, 0},
3139 {&handle_mesh_data_unicast, GNUNET_MESSAGE_TYPE_MESH_UNICAST, 0},
3140 {&handle_mesh_data_multicast, GNUNET_MESSAGE_TYPE_MESH_MULTICAST, 0},
3141 {&handle_mesh_data_to_orig, GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN, 0},
3142 {&handle_mesh_path_ack, GNUNET_MESSAGE_TYPE_MESH_PATH_ACK,
3143 sizeof (struct GNUNET_MESH_PathACK)},
3149 /******************************************************************************/
3150 /**************** MESH LOCAL HANDLER HELPERS ***********************/
3151 /******************************************************************************/
3154 * deregister_app: iterator for removing each application registered by a client
3156 * @param cls closure
3157 * @param key the hash of the application id (used to access the hashmap)
3158 * @param value the value stored at the key (client)
3160 * @return GNUNET_OK on success
3163 deregister_app (void *cls, const GNUNET_HashCode * key, void *value)
3165 GNUNET_break (GNUNET_YES ==
3166 GNUNET_CONTAINER_multihashmap_remove (applications, key,
3173 * notify_client_connection_failure: notify a client that the connection to the
3174 * requested remote peer is not possible (for instance, no route found)
3175 * Function called when the socket is ready to queue more data. "buf" will be
3176 * NULL and "size" zero if the socket was closed for writing in the meantime.
3178 * @param cls closure
3179 * @param size number of bytes available in buf
3180 * @param buf where the callee should write the message
3181 * @return number of bytes written to buf
3184 notify_client_connection_failure (void *cls, size_t size, void *buf)
3187 struct MeshPeerInfo *peer_info;
3188 struct GNUNET_MESH_PeerControl *msg;
3189 struct GNUNET_PeerIdentity id;
3191 if (0 == size && NULL == buf)
3193 // TODO retry? cancel?
3197 size_needed = sizeof (struct GNUNET_MESH_PeerControl);
3198 peer_info = (struct MeshPeerInfo *) cls;
3199 msg = (struct GNUNET_MESH_PeerControl *) buf;
3200 msg->header.size = htons (sizeof (struct GNUNET_MESH_PeerControl));
3201 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_DISCONNECTED);
3202 // msg->tunnel_id = htonl(peer_info->t->tid);
3203 GNUNET_PEER_resolve (peer_info->id, &id);
3204 memcpy (&msg->peer, &id, sizeof (struct GNUNET_PeerIdentity));
3212 * Send keepalive packets for a peer
3214 * @param cls Closure (tunnel for which to send the keepalive).
3215 * @param tc Notification context.
3217 * TODO: implement explicit multicast keepalive?
3220 path_refresh (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
3222 struct MeshTunnel *t = cls;
3223 struct GNUNET_MessageHeader *payload;
3224 struct GNUNET_MESH_Multicast *msg;
3226 sizeof (struct GNUNET_MESH_Multicast) +
3227 sizeof (struct GNUNET_MessageHeader);
3230 if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN)
3234 t->path_refresh_task = GNUNET_SCHEDULER_NO_TASK;
3236 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3237 "MESH: sending keepalive for tunnel %d\n", t->id.tid);
3239 msg = (struct GNUNET_MESH_Multicast *) cbuf;
3240 msg->header.size = htons (size);
3241 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_MULTICAST);
3242 msg->oid = my_full_id;
3243 msg->tid = htonl (t->id.tid);
3244 payload = (struct GNUNET_MessageHeader *) &msg[1];
3245 payload->size = htons (sizeof (struct GNUNET_MessageHeader));
3246 payload->type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_KEEPALIVE);
3247 tunnel_send_multicast (t, &msg->header);
3249 t->path_refresh_task =
3250 GNUNET_SCHEDULER_add_delayed (REFRESH_PATH_TIME, &path_refresh, t);
3256 * Function to process paths received for a new peer addition. The recorded
3257 * paths form the initial tunnel, which can be optimized later.
3258 * Called on each result obtained for the DHT search.
3260 * @param cls closure
3261 * @param exp when will this value expire
3262 * @param key key of the result
3263 * @param type type of the result
3264 * @param size number of bytes in data
3265 * @param data pointer to the result data
3267 * TODO: re-issue the request after certain time? cancel after X results?
3270 dht_get_id_handler (void *cls, struct GNUNET_TIME_Absolute exp,
3271 const GNUNET_HashCode * key,
3272 const struct GNUNET_PeerIdentity *get_path,
3273 unsigned int get_path_length,
3274 const struct GNUNET_PeerIdentity *put_path,
3275 unsigned int put_path_length, enum GNUNET_BLOCK_Type type,
3276 size_t size, const void *data)
3278 struct MeshPathInfo *path_info = cls;
3279 struct MeshPeerPath *p;
3280 struct GNUNET_PeerIdentity pi;
3283 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Got results from DHT!\n");
3284 GNUNET_PEER_resolve (path_info->peer->id, &pi);
3285 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: for %s\n", GNUNET_i2s (&pi));
3287 p = path_build_from_dht (get_path, get_path_length, put_path,
3289 peer_info_add_path (path_info->peer, p, GNUNET_NO);
3290 for (i = 0; i < path_info->peer->ntunnels; i++)
3292 tunnel_add_peer (path_info->peer->tunnels[i], path_info->peer);
3293 peer_info_connect (path_info->peer, path_info->t);
3301 * Function to process paths received for a new peer addition. The recorded
3302 * paths form the initial tunnel, which can be optimized later.
3303 * Called on each result obtained for the DHT search.
3305 * @param cls closure
3306 * @param exp when will this value expire
3307 * @param key key of the result
3308 * @param type type of the result
3309 * @param size number of bytes in data
3310 * @param data pointer to the result data
3313 dht_get_type_handler (void *cls, struct GNUNET_TIME_Absolute exp,
3314 const GNUNET_HashCode * key,
3315 const struct GNUNET_PeerIdentity *get_path,
3316 unsigned int get_path_length,
3317 const struct GNUNET_PeerIdentity *put_path,
3318 unsigned int put_path_length, enum GNUNET_BLOCK_Type type,
3319 size_t size, const void *data)
3321 const struct GNUNET_PeerIdentity *pi = data;
3322 struct MeshTunnel *t = cls;
3323 struct MeshPeerInfo *peer_info;
3324 struct MeshPeerPath *p;
3326 if (size != sizeof (struct GNUNET_PeerIdentity))
3328 GNUNET_break_op (0);
3331 GNUNET_assert (NULL != t->client);
3332 peer_info = peer_info_get (pi);
3333 (void) GNUNET_CONTAINER_multihashmap_put (t->peers, &pi->hashPubKey,
3335 GNUNET_CONTAINER_MULTIHASHMAPOPTION_REPLACE);
3337 p = path_build_from_dht (get_path, get_path_length, put_path,
3339 peer_info_add_path (peer_info, p, GNUNET_NO);
3340 tunnel_add_peer (t, peer_info);
3341 peer_info_connect (peer_info, t);
3345 /******************************************************************************/
3346 /********************* MESH LOCAL HANDLES **************************/
3347 /******************************************************************************/
3351 * Handler for client disconnection
3353 * @param cls closure
3354 * @param client identification of the client; NULL
3355 * for the last call when the server is destroyed
3358 handle_local_client_disconnect (void *cls, struct GNUNET_SERVER_Client *client)
3360 struct MeshClient *c;
3361 struct MeshClient *next;
3363 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: client disconnected\n");
3366 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: (SERVER DOWN)\n");
3372 if (c->handle != client && NULL != client)
3374 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: ... searching\n");
3378 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: matching client found\n");
3379 GNUNET_SERVER_client_drop (c->handle);
3380 if (NULL != c->tunnels)
3382 GNUNET_CONTAINER_multihashmap_iterate (c->tunnels,
3383 &tunnel_destroy_iterator, c);
3384 GNUNET_CONTAINER_multihashmap_destroy (c->tunnels);
3387 /* deregister clients applications */
3388 if (NULL != c->apps)
3390 GNUNET_CONTAINER_multihashmap_iterate (c->apps, &deregister_app, NULL);
3391 GNUNET_CONTAINER_multihashmap_destroy (c->apps);
3393 if (0 == GNUNET_CONTAINER_multihashmap_size (applications) &&
3394 GNUNET_SCHEDULER_NO_TASK != announce_applications_task)
3396 GNUNET_SCHEDULER_cancel (announce_applications_task);
3397 announce_applications_task = GNUNET_SCHEDULER_NO_TASK;
3399 if (NULL != c->types)
3400 GNUNET_CONTAINER_multihashmap_destroy (c->types);
3402 GNUNET_CONTAINER_DLL_remove (clients, clients_tail, c);
3403 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: CLIENT FREE at %p\n", c);
3408 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: done!\n");
3414 * Handler for new clients
3416 * @param cls closure
3417 * @param client identification of the client
3418 * @param message the actual message, which includes messages the client wants
3421 handle_local_new_client (void *cls, struct GNUNET_SERVER_Client *client,
3422 const struct GNUNET_MessageHeader *message)
3424 struct GNUNET_MESH_ClientConnect *cc_msg;
3425 struct MeshClient *c;
3426 GNUNET_MESH_ApplicationType *a;
3433 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: new client connected\n");
3434 /* Check data sanity */
3435 size = ntohs (message->size) - sizeof (struct GNUNET_MESH_ClientConnect);
3436 cc_msg = (struct GNUNET_MESH_ClientConnect *) message;
3437 ntypes = ntohs (cc_msg->types);
3438 napps = ntohs (cc_msg->applications);
3440 ntypes * sizeof (uint16_t) + napps * sizeof (GNUNET_MESH_ApplicationType))
3443 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3447 /* Create new client structure */
3448 c = GNUNET_malloc (sizeof (struct MeshClient));
3450 c->id = next_client_id++;
3451 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: CLIENT NEW %u at %p\n", c->id,
3455 GNUNET_SERVER_client_keep (client);
3456 a = (GNUNET_MESH_ApplicationType *) &cc_msg[1];
3459 GNUNET_MESH_ApplicationType at;
3462 c->apps = GNUNET_CONTAINER_multihashmap_create (napps);
3463 for (i = 0; i < napps; i++)
3466 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: app type: %u\n", at);
3467 GNUNET_CRYPTO_hash (&at, sizeof (at), &hc);
3468 /* store in clients hashmap */
3469 GNUNET_CONTAINER_multihashmap_put (c->apps, &hc, c,
3470 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
3471 /* store in global hashmap, for announcements */
3472 GNUNET_CONTAINER_multihashmap_put (applications, &hc, c,
3473 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
3475 if (GNUNET_SCHEDULER_NO_TASK == announce_applications_task)
3476 announce_applications_task =
3477 GNUNET_SCHEDULER_add_now (&announce_applications, NULL);
3485 t = (uint16_t *) & a[napps];
3486 c->types = GNUNET_CONTAINER_multihashmap_create (ntypes);
3487 for (i = 0; i < ntypes; i++)
3490 GNUNET_CRYPTO_hash (&u16, sizeof (u16), &hc);
3492 /* store in clients hashmap */
3493 GNUNET_CONTAINER_multihashmap_put (c->types, &hc, c,
3494 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
3495 /* store in global hashmap */
3496 GNUNET_CONTAINER_multihashmap_put (types, &hc, c,
3497 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
3500 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3501 "MESH: client has %u+%u subscriptions\n", napps, ntypes);
3503 GNUNET_CONTAINER_DLL_insert (clients, clients_tail, c);
3504 c->tunnels = GNUNET_CONTAINER_multihashmap_create (32);
3505 GNUNET_SERVER_notification_context_add (nc, client);
3507 GNUNET_SERVER_receive_done (client, GNUNET_OK);
3509 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: new client processed\n");
3515 * Handler for requests of new tunnels
3517 * @param cls closure
3518 * @param client identification of the client
3519 * @param message the actual message
3522 handle_local_tunnel_create (void *cls, struct GNUNET_SERVER_Client *client,
3523 const struct GNUNET_MessageHeader *message)
3525 struct GNUNET_MESH_TunnelMessage *t_msg;
3526 struct MeshTunnel *t;
3527 struct MeshClient *c;
3528 GNUNET_HashCode hash;
3530 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: new tunnel requested\n");
3532 /* Sanity check for client registration */
3533 if (NULL == (c = client_get (client)))
3536 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3540 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: by client %u\n", c->id);
3543 /* Message sanity check */
3544 if (sizeof (struct GNUNET_MESH_TunnelMessage) != ntohs (message->size))
3547 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3551 t_msg = (struct GNUNET_MESH_TunnelMessage *) message;
3552 /* Sanity check for tunnel numbering */
3553 if (0 == (ntohl (t_msg->tunnel_id) & GNUNET_MESH_LOCAL_TUNNEL_ID_CLI))
3556 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3559 /* Sanity check for duplicate tunnel IDs */
3560 if (NULL != tunnel_get_by_local_id (c, ntohl (t_msg->tunnel_id)))
3563 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3567 t = GNUNET_malloc (sizeof (struct MeshTunnel));
3568 while (NULL != tunnel_get_by_pi (myid, next_tid))
3569 next_tid = (next_tid + 1) & ~GNUNET_MESH_LOCAL_TUNNEL_ID_CLI;
3570 t->id.tid = next_tid++;
3571 next_tid = next_tid & ~GNUNET_MESH_LOCAL_TUNNEL_ID_CLI;
3573 t->local_tid = ntohl (t_msg->tunnel_id);
3575 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: CREATED TUNNEL %s [%x] (%x)\n",
3576 GNUNET_i2s (&my_full_id), t->id.tid, t->local_tid);
3579 t->peers = GNUNET_CONTAINER_multihashmap_create (32);
3581 GNUNET_CRYPTO_hash (&t->local_tid, sizeof (MESH_TunnelNumber), &hash);
3583 GNUNET_CONTAINER_multihashmap_put (c->tunnels, &hash, t,
3584 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
3587 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3591 GNUNET_CRYPTO_hash (&t->id, sizeof (struct MESH_TunnelID), &hash);
3593 GNUNET_CONTAINER_multihashmap_put (tunnels, &hash, t,
3594 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
3597 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3600 t->tree = tree_new (myid);
3602 GNUNET_SERVER_receive_done (client, GNUNET_OK);
3608 * Handler for requests of deleting tunnels
3610 * @param cls closure
3611 * @param client identification of the client
3612 * @param message the actual message
3615 handle_local_tunnel_destroy (void *cls, struct GNUNET_SERVER_Client *client,
3616 const struct GNUNET_MessageHeader *message)
3618 struct GNUNET_MESH_TunnelMessage *tunnel_msg;
3619 struct MeshClient *c;
3620 struct MeshTunnel *t;
3621 MESH_TunnelNumber tid;
3622 GNUNET_HashCode hash;
3624 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3625 "MESH: Got a DESTROY TUNNEL from client!\n");
3627 /* Sanity check for client registration */
3628 if (NULL == (c = client_get (client)))
3631 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3634 /* Message sanity check */
3635 if (sizeof (struct GNUNET_MESH_TunnelMessage) != ntohs (message->size))
3638 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3642 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: by client %u\n", c->id);
3644 tunnel_msg = (struct GNUNET_MESH_TunnelMessage *) message;
3646 /* Retrieve tunnel */
3647 tid = ntohl (tunnel_msg->tunnel_id);
3649 /* Remove from local id hashmap */
3650 GNUNET_CRYPTO_hash (&tid, sizeof (MESH_TunnelNumber), &hash);
3651 t = GNUNET_CONTAINER_multihashmap_get (c->tunnels, &hash);
3652 GNUNET_assert (GNUNET_YES ==
3653 GNUNET_CONTAINER_multihashmap_remove (c->tunnels, &hash, t));
3656 tunnel_send_destroy (t);
3658 GNUNET_SERVER_receive_done (client, GNUNET_OK);
3664 * Handler for connection requests to new peers
3666 * @param cls closure
3667 * @param client identification of the client
3668 * @param message the actual message (PeerControl)
3671 handle_local_connect_add (void *cls, struct GNUNET_SERVER_Client *client,
3672 const struct GNUNET_MessageHeader *message)
3674 struct GNUNET_MESH_PeerControl *peer_msg;
3675 struct MeshPeerInfo *peer_info;
3676 struct MeshClient *c;
3677 struct MeshTunnel *t;
3678 MESH_TunnelNumber tid;
3680 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Got connection request\n");
3681 /* Sanity check for client registration */
3682 if (NULL == (c = client_get (client)))
3685 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3689 peer_msg = (struct GNUNET_MESH_PeerControl *) message;
3690 /* Sanity check for message size */
3691 if (sizeof (struct GNUNET_MESH_PeerControl) != ntohs (peer_msg->header.size))
3694 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3698 /* Tunnel exists? */
3699 tid = ntohl (peer_msg->tunnel_id);
3700 t = tunnel_get_by_local_id (c, tid);
3704 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3708 /* Does client own tunnel? */
3709 if (t->client->handle != client)
3712 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3715 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: for %s\n",
3716 GNUNET_i2s (&peer_msg->peer));
3717 peer_info = peer_info_get (&peer_msg->peer);
3719 tunnel_add_peer (t, peer_info);
3720 peer_info_connect (peer_info, t);
3722 GNUNET_SERVER_receive_done (client, GNUNET_OK);
3728 * Handler for disconnection requests of peers in a tunnel
3730 * @param cls closure
3731 * @param client identification of the client
3732 * @param message the actual message (PeerControl)
3735 handle_local_connect_del (void *cls, struct GNUNET_SERVER_Client *client,
3736 const struct GNUNET_MessageHeader *message)
3738 struct GNUNET_MESH_PeerControl *peer_msg;
3739 struct MeshPeerInfo *peer_info;
3740 struct MeshClient *c;
3741 struct MeshTunnel *t;
3742 MESH_TunnelNumber tid;
3744 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Got a PEER DEL request\n");
3745 /* Sanity check for client registration */
3746 if (NULL == (c = client_get (client)))
3749 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3752 peer_msg = (struct GNUNET_MESH_PeerControl *) message;
3753 /* Sanity check for message size */
3754 if (sizeof (struct GNUNET_MESH_PeerControl) != ntohs (peer_msg->header.size))
3757 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3761 /* Tunnel exists? */
3762 tid = ntohl (peer_msg->tunnel_id);
3763 t = tunnel_get_by_local_id (c, tid);
3767 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3770 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: on tunnel %X\n", t->id.tid);
3772 /* Does client own tunnel? */
3773 if (t->client->handle != client)
3776 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3780 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: for peer %s\n",
3781 GNUNET_i2s (&peer_msg->peer));
3782 /* Is the peer in the tunnel? */
3784 GNUNET_CONTAINER_multihashmap_get (t->peers, &peer_msg->peer.hashPubKey);
3785 if (NULL == peer_info)
3788 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3792 /* Ok, delete peer from tunnel */
3793 GNUNET_CONTAINER_multihashmap_remove_all (t->peers,
3794 &peer_msg->peer.hashPubKey);
3796 send_destroy_path (t, peer_info->id);
3797 tunnel_delete_peer (t, peer_info->id);
3798 GNUNET_SERVER_receive_done (client, GNUNET_OK);
3804 * Handler for connection requests to new peers by type
3806 * @param cls closure
3807 * @param client identification of the client
3808 * @param message the actual message (ConnectPeerByType)
3811 handle_local_connect_by_type (void *cls, struct GNUNET_SERVER_Client *client,
3812 const struct GNUNET_MessageHeader *message)
3814 struct GNUNET_MESH_ConnectPeerByType *connect_msg;
3815 struct MeshClient *c;
3816 struct MeshTunnel *t;
3817 GNUNET_HashCode hash;
3818 MESH_TunnelNumber tid;
3820 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: got connect by type request\n");
3821 /* Sanity check for client registration */
3822 if (NULL == (c = client_get (client)))
3825 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3829 connect_msg = (struct GNUNET_MESH_ConnectPeerByType *) message;
3830 /* Sanity check for message size */
3831 if (sizeof (struct GNUNET_MESH_ConnectPeerByType) !=
3832 ntohs (connect_msg->header.size))
3835 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3839 /* Tunnel exists? */
3840 tid = ntohl (connect_msg->tunnel_id);
3841 t = tunnel_get_by_local_id (c, tid);
3845 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3849 /* Does client own tunnel? */
3850 if (t->client->handle != client)
3853 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3857 /* Do WE have the service? */
3858 t->type = ntohl (connect_msg->type);
3859 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: type requested: %u\n", t->type);
3860 GNUNET_CRYPTO_hash (&t->type, sizeof (GNUNET_MESH_ApplicationType), &hash);
3861 if (GNUNET_CONTAINER_multihashmap_contains (applications, &hash) ==
3864 /* Yes! Fast forward, add ourselves to the tunnel and send the
3865 * good news to the client
3867 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: available locally\n");
3868 GNUNET_CONTAINER_multihashmap_put (t->peers, &my_full_id.hashPubKey,
3869 peer_info_get (&my_full_id),
3870 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
3872 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: notifying client\n");
3873 send_client_peer_connected (t, myid);
3874 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Done\n");
3875 GNUNET_SERVER_receive_done (client, GNUNET_OK);
3878 /* Ok, lets find a peer offering the service */
3879 if (NULL != t->dht_get_type)
3881 GNUNET_DHT_get_stop (t->dht_get_type);
3883 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: looking in DHT for %s\n",
3884 GNUNET_h2s (&hash));
3886 GNUNET_DHT_get_start (dht_handle, GNUNET_TIME_UNIT_FOREVER_REL,
3887 GNUNET_BLOCK_TYPE_TEST, &hash, 10U,
3888 GNUNET_DHT_RO_RECORD_ROUTE |
3889 GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE, NULL, 0,
3890 &dht_get_type_handler, t);
3892 GNUNET_SERVER_receive_done (client, GNUNET_OK);
3898 * Handler for client traffic directed to one peer
3900 * @param cls closure
3901 * @param client identification of the client
3902 * @param message the actual message
3905 handle_local_unicast (void *cls, struct GNUNET_SERVER_Client *client,
3906 const struct GNUNET_MessageHeader *message)
3908 struct MeshClient *c;
3909 struct MeshTunnel *t;
3910 struct MeshPeerInfo *pi;
3911 struct GNUNET_MESH_Unicast *data_msg;
3912 MESH_TunnelNumber tid;
3915 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3916 "MESH: Got a unicast request from a client!\n");
3918 /* Sanity check for client registration */
3919 if (NULL == (c = client_get (client)))
3922 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3925 data_msg = (struct GNUNET_MESH_Unicast *) message;
3926 /* Sanity check for message size */
3927 size = ntohs (message->size);
3928 if (sizeof (struct GNUNET_MESH_Unicast) +
3929 sizeof (struct GNUNET_MessageHeader) > size)
3932 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3936 /* Tunnel exists? */
3937 tid = ntohl (data_msg->tid);
3938 t = tunnel_get_by_local_id (c, tid);
3942 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3946 /* Is it a local tunnel? Then, does client own the tunnel? */
3947 if (NULL != t->client && NULL != t->client->handle &&
3948 t->client->handle != client)
3951 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3955 pi = GNUNET_CONTAINER_multihashmap_get (t->peers,
3956 &data_msg->destination.hashPubKey);
3957 /* Is the selected peer in the tunnel? */
3961 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3965 /* Ok, everything is correct, send the message
3966 * (pretend we got it from a mesh peer)
3969 char buf[ntohs (message->size)];
3970 struct GNUNET_MESH_Unicast *copy;
3972 /* Work around const limitation */
3973 copy = (struct GNUNET_MESH_Unicast *) buf;
3974 memcpy (buf, data_msg, size);
3975 copy->oid = my_full_id;
3976 copy->tid = htonl (t->id.tid);
3977 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3978 "MESH: calling generic handler...\n");
3979 handle_mesh_data_unicast (NULL, &my_full_id, ©->header, NULL, 0);
3981 GNUNET_SERVER_receive_done (client, GNUNET_OK);
3987 * Handler for client traffic directed to the origin
3989 * @param cls closure
3990 * @param client identification of the client
3991 * @param message the actual message
3994 handle_local_to_origin (void *cls, struct GNUNET_SERVER_Client *client,
3995 const struct GNUNET_MessageHeader *message)
3997 struct GNUNET_MESH_ToOrigin *data_msg;
3998 struct GNUNET_PeerIdentity id;
3999 struct MeshClient *c;
4000 struct MeshTunnel *t;
4001 MESH_TunnelNumber tid;
4004 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4005 "MESH: Got a ToOrigin request from a client!\n");
4007 /* Sanity check for client registration */
4008 if (NULL == (c = client_get (client)))
4011 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4014 data_msg = (struct GNUNET_MESH_ToOrigin *) message;
4015 /* Sanity check for message size */
4016 size = ntohs (message->size);
4017 if (sizeof (struct GNUNET_MESH_ToOrigin) +
4018 sizeof (struct GNUNET_MessageHeader) > size)
4021 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4025 /* Tunnel exists? */
4026 tid = ntohl (data_msg->tid);
4027 if (tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
4030 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4033 t = tunnel_get_by_local_id (c, tid);
4037 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4041 /* It shouldn't be a local tunnel. */
4042 if (NULL != t->client)
4045 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4048 GNUNET_PEER_resolve (t->id.oid, &id);
4050 /* Ok, everything is correct, send the message
4051 * (pretend we got it from a mesh peer)
4054 char buf[ntohs (message->size)];
4055 struct GNUNET_MESH_ToOrigin *copy;
4057 /* Work around const limitation */
4058 copy = (struct GNUNET_MESH_ToOrigin *) buf;
4059 memcpy (buf, data_msg, size);
4061 copy->tid = htonl (t->id.tid);
4062 copy->sender = my_full_id;
4063 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4064 "MESH: calling generic handler...\n");
4065 handle_mesh_data_to_orig (NULL, &my_full_id, ©->header, NULL, 0);
4067 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4073 * Handler for client traffic directed to all peers in a tunnel
4075 * @param cls closure
4076 * @param client identification of the client
4077 * @param message the actual message
4080 handle_local_multicast (void *cls, struct GNUNET_SERVER_Client *client,
4081 const struct GNUNET_MessageHeader *message)
4083 struct MeshClient *c;
4084 struct MeshTunnel *t;
4085 struct GNUNET_MESH_Multicast *data_msg;
4086 MESH_TunnelNumber tid;
4088 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4089 "MESH: Got a multicast request from a client!\n");
4091 /* Sanity check for client registration */
4092 if (NULL == (c = client_get (client)))
4095 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4098 data_msg = (struct GNUNET_MESH_Multicast *) message;
4099 /* Sanity check for message size */
4100 if (sizeof (struct GNUNET_MESH_Multicast) +
4101 sizeof (struct GNUNET_MessageHeader) > ntohs (data_msg->header.size))
4104 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4108 /* Tunnel exists? */
4109 tid = ntohl (data_msg->tid);
4110 t = tunnel_get_by_local_id (c, tid);
4114 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4118 /* Does client own tunnel? */
4119 if (t->client->handle != client)
4122 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4127 char buf[ntohs (message->size)];
4128 struct GNUNET_MESH_Multicast *copy;
4130 copy = (struct GNUNET_MESH_Multicast *) buf;
4131 memcpy (buf, message, ntohs (message->size));
4132 copy->oid = my_full_id;
4133 copy->tid = htonl (t->id.tid);
4134 copy->ttl = htonl (DEFAULT_TTL);
4135 copy->mid = htonl (t->mid + 1);
4136 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4137 "MESH: calling generic handler...\n");
4138 handle_mesh_data_multicast (client, &my_full_id, ©->header, NULL, 0);
4141 /* receive done gets called when last copy is sent to a neighbor */
4146 * Functions to handle messages from clients
4148 static struct GNUNET_SERVER_MessageHandler client_handlers[] = {
4149 {&handle_local_new_client, NULL,
4150 GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT, 0},
4151 {&handle_local_tunnel_create, NULL,
4152 GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE,
4153 sizeof (struct GNUNET_MESH_TunnelMessage)},
4154 {&handle_local_tunnel_destroy, NULL,
4155 GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY,
4156 sizeof (struct GNUNET_MESH_TunnelMessage)},
4157 {&handle_local_connect_add, NULL,
4158 GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD,
4159 sizeof (struct GNUNET_MESH_PeerControl)},
4160 {&handle_local_connect_del, NULL,
4161 GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_DEL,
4162 sizeof (struct GNUNET_MESH_PeerControl)},
4163 {&handle_local_connect_by_type, NULL,
4164 GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD_BY_TYPE,
4165 sizeof (struct GNUNET_MESH_ConnectPeerByType)},
4166 {&handle_local_unicast, NULL,
4167 GNUNET_MESSAGE_TYPE_MESH_UNICAST, 0},
4168 {&handle_local_to_origin, NULL,
4169 GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN, 0},
4170 {&handle_local_multicast, NULL,
4171 GNUNET_MESSAGE_TYPE_MESH_MULTICAST, 0},
4177 * To be called on core init/fail.
4179 * @param cls service closure
4180 * @param server handle to the server for this service
4181 * @param identity the public identity of this peer
4184 core_init (void *cls, struct GNUNET_CORE_Handle *server,
4185 const struct GNUNET_PeerIdentity *identity)
4187 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Core init\n");
4188 core_handle = server;
4189 if (0 != memcmp (identity, &my_full_id, sizeof (my_full_id)) ||
4192 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, _("MESH: Wrong CORE service\n"));
4193 GNUNET_SCHEDULER_shutdown ();
4199 * Method called whenever a given peer connects.
4201 * @param cls closure
4202 * @param peer peer identity this notification is about
4203 * @param atsi performance data for the connection
4204 * @param atsi_count number of records in 'atsi'
4207 core_connect (void *cls, const struct GNUNET_PeerIdentity *peer,
4208 const struct GNUNET_ATS_Information *atsi,
4209 unsigned int atsi_count)
4211 struct MeshPeerInfo *peer_info;
4212 struct MeshPeerPath *path;
4214 #if MESH_DEBUG_CONNECTION
4215 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Peer connected\n");
4216 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: %s\n",
4217 GNUNET_i2s (&my_full_id));
4219 peer_info = peer_info_get (peer);
4220 if (myid == peer_info->id)
4222 #if MESH_DEBUG_CONNECTION
4223 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: (self)\n");
4227 #if MESH_DEBUG_CONNECTION
4230 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: %s\n", GNUNET_i2s (peer));
4233 path = path_new (2);
4234 path->peers[0] = myid;
4235 path->peers[1] = peer_info->id;
4236 GNUNET_PEER_change_rc (myid, 1);
4237 GNUNET_PEER_change_rc (peer_info->id, 1);
4238 peer_info_add_path (peer_info, path, GNUNET_YES);
4243 * Method called whenever a peer disconnects.
4245 * @param cls closure
4246 * @param peer peer identity this notification is about
4249 core_disconnect (void *cls, const struct GNUNET_PeerIdentity *peer)
4251 struct MeshPeerInfo *pi;
4254 #if MESH_DEBUG_CONNECTION
4255 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Peer disconnected\n");
4257 pi = GNUNET_CONTAINER_multihashmap_get (peers, &peer->hashPubKey);
4263 for (i = 0; i < CORE_QUEUE_SIZE; i++)
4265 /* TODO: notify that the transmission failed */
4266 peer_info_cancel_transmission (pi, i);
4268 peer_info_remove_path (pi, pi->id, myid);
4269 #if MESH_DEBUG_CONNECTION
4272 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: (self)\n");
4279 /******************************************************************************/
4280 /************************ MAIN FUNCTIONS ****************************/
4281 /******************************************************************************/
4284 * Iterator over tunnel hash map entries to destroy the tunnel during shutdown.
4286 * @param cls closure
4287 * @param key current key code
4288 * @param value value in the hash map
4289 * @return GNUNET_YES if we should continue to iterate,
4293 shutdown_tunnel (void *cls, const GNUNET_HashCode * key, void *value)
4295 struct MeshTunnel *t = value;
4302 * Iterator over peer hash map entries to destroy the tunnel during shutdown.
4304 * @param cls closure
4305 * @param key current key code
4306 * @param value value in the hash map
4307 * @return GNUNET_YES if we should continue to iterate,
4311 shutdown_peer (void *cls, const GNUNET_HashCode * key, void *value)
4313 struct MeshPeerInfo *p = value;
4315 peer_info_destroy (p);
4320 * Task run during shutdown.
4326 shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
4328 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: shutting down\n");
4329 /* TODO: destroy tunnels? */
4330 if (core_handle != NULL)
4332 GNUNET_CORE_disconnect (core_handle);
4335 GNUNET_CONTAINER_multihashmap_iterate (tunnels, &shutdown_tunnel, NULL);
4336 GNUNET_CONTAINER_multihashmap_iterate (peers, &shutdown_peer, NULL);
4337 if (dht_handle != NULL)
4339 GNUNET_DHT_disconnect (dht_handle);
4344 GNUNET_SERVER_notification_context_destroy (nc);
4347 if (GNUNET_SCHEDULER_NO_TASK != announce_id_task)
4349 GNUNET_SCHEDULER_cancel (announce_id_task);
4350 announce_id_task = GNUNET_SCHEDULER_NO_TASK;
4352 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: shut down\n");
4356 * Process mesh requests.
4358 * @param cls closure
4359 * @param server the initialized server
4360 * @param c configuration to use
4363 run (void *cls, struct GNUNET_SERVER_Handle *server,
4364 const struct GNUNET_CONFIGURATION_Handle *c)
4366 struct MeshPeerInfo *peer;
4367 struct MeshPeerPath *p;
4370 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: starting to run\n");
4371 server_handle = server;
4372 core_handle = GNUNET_CORE_connect (c, /* Main configuration */
4373 CORE_QUEUE_SIZE, /* queue size */
4374 NULL, /* Closure passed to MESH functions */
4375 &core_init, /* Call core_init once connected */
4376 &core_connect, /* Handle connects */
4377 &core_disconnect, /* remove peers on disconnects */
4378 NULL, /* Don't notify about all incoming messages */
4379 GNUNET_NO, /* For header only in notification */
4380 NULL, /* Don't notify about all outbound messages */
4381 GNUNET_NO, /* For header-only out notification */
4382 core_handlers); /* Register these handlers */
4384 if (core_handle == NULL)
4387 GNUNET_SCHEDULER_shutdown ();
4392 GNUNET_CONFIGURATION_get_value_filename (c, "GNUNETD", "HOSTKEY",
4395 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4397 ("Mesh service is lacking key configuration settings. Exiting.\n"));
4398 GNUNET_SCHEDULER_shutdown ();
4401 my_private_key = GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
4402 GNUNET_free (keyfile);
4403 if (my_private_key == NULL)
4405 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4406 _("Mesh service could not access hostkey. Exiting.\n"));
4407 GNUNET_SCHEDULER_shutdown ();
4410 GNUNET_CRYPTO_rsa_key_get_public (my_private_key, &my_public_key);
4411 GNUNET_CRYPTO_hash (&my_public_key, sizeof (my_public_key),
4412 &my_full_id.hashPubKey);
4413 myid = GNUNET_PEER_intern (&my_full_id);
4415 // // transport_handle = GNUNET_TRANSPORT_connect(c,
4422 dht_handle = GNUNET_DHT_connect (c, 64);
4423 if (dht_handle == NULL)
4429 next_local_tid = GNUNET_MESH_LOCAL_TUNNEL_ID_SERV;
4431 tunnels = GNUNET_CONTAINER_multihashmap_create (32);
4432 incoming_tunnels = GNUNET_CONTAINER_multihashmap_create (32);
4433 peers = GNUNET_CONTAINER_multihashmap_create (32);
4434 applications = GNUNET_CONTAINER_multihashmap_create (32);
4435 types = GNUNET_CONTAINER_multihashmap_create (32);
4437 GNUNET_SERVER_add_handlers (server_handle, client_handlers);
4438 nc = GNUNET_SERVER_notification_context_create (server_handle,
4440 GNUNET_SERVER_disconnect_notify (server_handle,
4441 &handle_local_client_disconnect, NULL);
4445 clients_tail = NULL;
4450 announce_applications_task = GNUNET_SCHEDULER_NO_TASK;
4451 announce_id_task = GNUNET_SCHEDULER_add_now (&announce_id, cls);
4453 /* Create a peer_info for the local peer */
4454 peer = peer_info_get (&my_full_id);
4457 GNUNET_PEER_change_rc (myid, 1);
4458 peer_info_add_path (peer, p, GNUNET_YES);
4460 /* Scheduled the task to clean up when shutdown is called */
4461 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &shutdown_task,
4464 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: end of run()\n");
4468 * The main function for the mesh service.
4470 * @param argc number of arguments from the command line
4471 * @param argv command line arguments
4472 * @return 0 ok, 1 on error
4475 main (int argc, char *const *argv)
4479 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: main()\n");
4482 GNUNET_SERVICE_run (argc, argv, "mesh", GNUNET_SERVICE_OPTION_NONE, &run,
4484 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: main() END\n");