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 = path_get_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->length <= 2 && GNUNET_NO == trusted)
1526 /* Only allow CORE to tell us about direct paths */
1527 path_destroy (path);
1530 GNUNET_assert (peer_info->id == path->peers[path->length - 1]);
1531 for (l = 1; l < path->length; l++)
1533 if (path->peers[l] == myid)
1535 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: shortening path by %u\n", l);
1536 for (l2 = 0; l2 < path->length - l; l2++)
1538 path->peers[l2] = path->peers[l + l2];
1543 GNUNET_realloc (path->peers, path->length * sizeof (GNUNET_PEER_Id));
1548 struct GNUNET_PeerIdentity id;
1550 GNUNET_PEER_resolve (peer_info->id, &id);
1551 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: adding path [%u] to peer %s\n",
1552 path->length, GNUNET_i2s (&id));
1555 l = path_get_length (path);
1562 GNUNET_assert (peer_info->id == path->peers[path->length - 1]);
1563 for (aux = peer_info->path_head; aux != NULL; aux = aux->next)
1565 l2 = path_get_length (aux);
1568 GNUNET_CONTAINER_DLL_insert_before (peer_info->path_head,
1569 peer_info->path_tail, aux, path);
1574 if (l2 == l && memcmp (path->peers, aux->peers, l) == 0)
1576 path_destroy (path);
1581 GNUNET_CONTAINER_DLL_insert_tail (peer_info->path_head, peer_info->path_tail,
1588 * Add the path to the origin peer and update the path used to reach it in case
1589 * this is the shortest.
1590 * The path is given in peer_info -> destination, therefore we turn the path
1591 * upside down first.
1593 * @param peer_info Peer to add the path to, being the origin of the path.
1594 * @param path New path to add after being inversed.
1595 * @param trusted Do we trust that this path is real?
1598 peer_info_add_path_to_origin (struct MeshPeerInfo *peer_info,
1599 struct MeshPeerPath *path, int trusted)
1602 peer_info_add_path (peer_info, path, trusted);
1607 * Build a PeerPath from the paths returned from the DHT, reversing the paths
1608 * to obtain a local peer -> destination path and interning the peer ids.
1610 * @return Newly allocated and created path
1612 static struct MeshPeerPath *
1613 path_build_from_dht (const struct GNUNET_PeerIdentity *get_path,
1614 unsigned int get_path_length,
1615 const struct GNUNET_PeerIdentity *put_path,
1616 unsigned int put_path_length)
1618 struct MeshPeerPath *p;
1624 GNUNET_PEER_change_rc (myid, 1);
1625 i = get_path_length;
1626 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: GET has %d hops.\n", i);
1627 for (i--; i >= 0; i--)
1629 id = GNUNET_PEER_intern (&get_path[i]);
1630 if (p->length > 0 && id == p->peers[p->length - 1])
1632 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Optimizing 1 hop out.\n");
1633 GNUNET_PEER_change_rc (id, -1);
1637 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Adding from GET: %s.\n",
1638 GNUNET_i2s (&get_path[i]));
1640 p->peers = GNUNET_realloc (p->peers, sizeof (GNUNET_PEER_Id) * p->length);
1641 p->peers[p->length - 1] = id;
1644 i = put_path_length;
1645 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: PUT has %d hops.\n", i);
1646 for (i--; i >= 0; i--)
1648 id = GNUNET_PEER_intern (&put_path[i]);
1651 /* PUT path went through us, so discard the path up until now and start
1652 * from here to get a much shorter (and loop-free) path.
1657 if (p->length > 0 && id == p->peers[p->length - 1])
1659 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Optimizing 1 hop out.\n");
1660 GNUNET_PEER_change_rc (id, -1);
1664 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Adding from PUT: %s.\n",
1665 GNUNET_i2s (&put_path[i]));
1667 p->peers = GNUNET_realloc (p->peers, sizeof (GNUNET_PEER_Id) * p->length);
1668 p->peers[p->length - 1] = id;
1672 if (get_path_length > 0)
1673 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: (first of GET: %s)\n",
1674 GNUNET_i2s (&get_path[0]));
1675 if (put_path_length > 0)
1676 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: (first of PUT: %s)\n",
1677 GNUNET_i2s (&put_path[0]));
1678 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: In total: %d hops\n",
1680 for (i = 0; i < p->length; i++)
1682 struct GNUNET_PeerIdentity peer_id;
1684 GNUNET_PEER_resolve (p->peers[i], &peer_id);
1685 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: %u: %s\n", p->peers[i],
1686 GNUNET_i2s (&peer_id));
1694 * Send keepalive packets for a peer
1696 * @param cls Closure (tunnel for which to send the keepalive).
1697 * @param tc Notification context.
1699 * TODO: implement explicit multicast keepalive?
1702 path_refresh (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
1706 * Search for a tunnel among the incoming tunnels
1708 * @param tid the local id of the tunnel
1710 * @return tunnel handler, NULL if doesn't exist
1712 static struct MeshTunnel *
1713 tunnel_get_incoming (MESH_TunnelNumber tid)
1715 GNUNET_HashCode hash;
1717 GNUNET_assert (tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV);
1718 GNUNET_CRYPTO_hash (&tid, sizeof (MESH_TunnelNumber), &hash);
1719 return GNUNET_CONTAINER_multihashmap_get (incoming_tunnels, &hash);
1724 * Search for a tunnel among the tunnels for a client
1726 * @param c the client whose tunnels to search in
1727 * @param tid the local id of the tunnel
1729 * @return tunnel handler, NULL if doesn't exist
1731 static struct MeshTunnel *
1732 tunnel_get_by_local_id (struct MeshClient *c, MESH_TunnelNumber tid)
1734 if (tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
1736 return tunnel_get_incoming (tid);
1740 GNUNET_HashCode hash;
1742 GNUNET_CRYPTO_hash (&tid, sizeof (MESH_TunnelNumber), &hash);
1743 return GNUNET_CONTAINER_multihashmap_get (c->tunnels, &hash);
1749 * Search for a tunnel by global ID using PEER_ID
1751 * @param pi owner of the tunnel
1752 * @param tid global tunnel number
1754 * @return tunnel handler, NULL if doesn't exist
1756 static struct MeshTunnel *
1757 tunnel_get_by_pi (GNUNET_PEER_Id pi, MESH_TunnelNumber tid)
1759 struct MESH_TunnelID id;
1760 GNUNET_HashCode hash;
1765 GNUNET_CRYPTO_hash (&id, sizeof (struct MESH_TunnelID), &hash);
1766 return GNUNET_CONTAINER_multihashmap_get (tunnels, &hash);
1771 * Search for a tunnel by global ID using full PeerIdentities
1773 * @param oid owner of the tunnel
1774 * @param tid global tunnel number
1776 * @return tunnel handler, NULL if doesn't exist
1778 static struct MeshTunnel *
1779 tunnel_get (struct GNUNET_PeerIdentity *oid, MESH_TunnelNumber tid)
1781 return tunnel_get_by_pi (GNUNET_PEER_search (oid), tid);
1786 * Callback used to notify a client owner of a tunnel that a peer has
1787 * disconnected, most likely because of a path change.
1789 * @param cls Closure (tunnel this notification is about).
1790 * @param peer_id Short ID of disconnected peer.
1793 notify_peer_disconnected (void *cls, GNUNET_PEER_Id peer_id)
1795 struct MeshTunnel *t = cls;
1796 struct MeshPeerInfo *peer;
1797 struct MeshPathInfo *path_info;
1799 if (NULL != t->client && NULL != nc)
1801 struct GNUNET_MESH_PeerControl msg;
1803 msg.header.size = htons (sizeof (msg));
1804 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_DEL);
1805 msg.tunnel_id = htonl (t->local_tid);
1806 GNUNET_PEER_resolve (peer_id, &msg.peer);
1807 GNUNET_SERVER_notification_context_unicast (nc, t->client->handle,
1808 &msg.header, GNUNET_NO);
1810 peer = peer_info_get_short (peer_id);
1811 path_info = GNUNET_malloc (sizeof (struct MeshPathInfo));
1812 path_info->peer = peer;
1814 GNUNET_SCHEDULER_add_now (&peer_info_connect_task, path_info);
1819 * Add a peer to a tunnel, accomodating paths accordingly and initializing all
1820 * needed rescources.
1821 * If peer already exists, reevaluate shortest path and change if different.
1823 * @param t Tunnel we want to add a new peer to
1824 * @param peer PeerInfo of the peer being added
1828 tunnel_add_peer (struct MeshTunnel *t, struct MeshPeerInfo *peer)
1830 struct GNUNET_PeerIdentity id;
1831 struct MeshPeerPath *best_p;
1832 struct MeshPeerPath *p;
1833 unsigned int best_cost;
1836 GNUNET_PEER_resolve (peer->id, &id);
1838 GNUNET_CONTAINER_multihashmap_contains (t->peers, &id.hashPubKey))
1841 GNUNET_array_append (peer->tunnels, peer->ntunnels, t);
1842 GNUNET_assert (GNUNET_OK ==
1843 GNUNET_CONTAINER_multihashmap_put (t->peers, &id.hashPubKey,
1845 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST));
1848 if (NULL != (p = peer->path_head))
1851 best_cost = path_get_cost (t->tree, p);
1854 if ((cost = path_get_cost (t->tree, p)) < best_cost)
1861 tree_add_path (t->tree, best_p, ¬ify_peer_disconnected, t);
1862 if (GNUNET_SCHEDULER_NO_TASK == t->path_refresh_task)
1863 t->path_refresh_task =
1864 GNUNET_SCHEDULER_add_delayed (REFRESH_PATH_TIME, &path_refresh, t);
1868 /* Start a DHT get if necessary */
1869 peer_info_connect (peer, t);
1874 * Add a path to a tunnel which we don't own, just to remember the next hop.
1875 * If destination node was already in the tunnel, the first hop information
1876 * will be replaced with the new path.
1878 * @param t Tunnel we want to add a new peer to
1879 * @param p Path to add
1880 * @param own_pos Position of local node in path.
1884 tunnel_add_path (struct MeshTunnel *t, struct MeshPeerPath *p,
1885 unsigned int own_pos)
1887 struct GNUNET_PeerIdentity id;
1889 GNUNET_assert (0 != own_pos);
1890 tree_add_path (t->tree, p, NULL, NULL);
1891 if (own_pos < p->length - 1)
1893 GNUNET_PEER_resolve (p->peers[own_pos + 1], &id);
1894 tree_update_first_hops (t->tree, myid, &id);
1900 * Notifies a tunnel that a connection has broken that affects at least
1901 * some of its peers. Sends a notification towards the root of the tree.
1902 * In case the peer is the owner of the tree, notifies the client that owns
1903 * the tunnel and tries to reconnect.
1905 * @param t Tunnel affected.
1906 * @param p1 Peer that got disconnected from p2.
1907 * @param p2 Peer that got disconnected from p1.
1909 * @return Short ID of the peer disconnected (either p1 or p2).
1910 * 0 if the tunnel remained unaffected.
1912 static GNUNET_PEER_Id
1913 tunnel_notify_connection_broken (struct MeshTunnel *t, GNUNET_PEER_Id p1,
1919 tree_notify_connection_broken (t->tree, p1, p2, ¬ify_peer_disconnected,
1921 if (myid != p1 && myid != p2)
1927 if (tree_get_predecessor (t->tree) != 0)
1929 /* We are the peer still connected, notify owner of the disconnection. */
1930 struct GNUNET_MESH_PathBroken msg;
1931 struct GNUNET_PeerIdentity neighbor;
1933 msg.header.size = htons (sizeof (msg));
1934 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_BROKEN);
1935 GNUNET_PEER_resolve (t->id.oid, &msg.oid);
1936 msg.tid = htonl (t->id.tid);
1937 msg.peer1 = my_full_id;
1938 GNUNET_PEER_resolve (pid, &msg.peer2);
1939 GNUNET_PEER_resolve (tree_get_predecessor (t->tree), &neighbor);
1940 send_message (&msg.header, &neighbor);
1947 struct MeshMulticastData
1949 struct MeshTunnel *t;
1951 GNUNET_SCHEDULER_TaskIdentifier *task;
1953 unsigned int *reference_counter;
1962 * Send a multicast packet to a neighbor.
1965 tunnel_send_multicast_iterator (void *cls, GNUNET_PEER_Id neighbor_id)
1967 struct MeshMulticastData *mdata = cls;
1968 struct MeshDataDescriptor *info;
1969 struct GNUNET_PeerIdentity neighbor;
1972 info = GNUNET_malloc (sizeof (struct MeshDataDescriptor));
1974 info->data = mdata->data;
1975 info->size = mdata->data_len;
1976 info->copies = mdata->reference_counter;
1977 (*(mdata->reference_counter))++;
1979 if (NULL != mdata->t->client)
1981 info->client = mdata->t->client->handle;
1982 info->timeout_task = mdata->task;
1984 info->destination = neighbor_id;
1985 GNUNET_PEER_resolve (neighbor_id, &neighbor);
1987 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: sending to %s...\n",
1988 GNUNET_i2s (&neighbor));
1990 info->peer = peer_info_get (&neighbor);
1991 GNUNET_assert (NULL != info->peer);
1992 i = peer_info_transmit_slot (info->peer);
1993 info->handler_n = i;
1994 info->peer->infos[i] = info;
1995 info->peer->types[i] = GNUNET_MESSAGE_TYPE_MESH_MULTICAST;
1996 info->peer->core_transmit[i] =
1997 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0,
1998 GNUNET_TIME_UNIT_FOREVER_REL,
1999 &neighbor, info->size,
2000 &send_core_data_multicast, info);
2004 * Send a message in a tunnel in multicast, sending a copy to each child node
2005 * down the local one in the tunnel tree.
2007 * @param t Tunnel in which to send the data.
2008 * @param msg Message to be sent
2011 tunnel_send_multicast (struct MeshTunnel *t,
2012 const struct GNUNET_MessageHeader *msg)
2014 struct MeshMulticastData *mdata;
2017 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2018 "MESH: sending a multicast packet...\n");
2020 mdata = GNUNET_malloc (sizeof (struct MeshMulticastData));
2021 mdata->data_len = ntohs (msg->size);
2022 mdata->reference_counter = GNUNET_malloc (sizeof (unsigned int));
2024 mdata->data = GNUNET_malloc (mdata->data_len);
2025 memcpy (mdata->data, msg, mdata->data_len);
2026 if (ntohs (msg->type) == GNUNET_MESSAGE_TYPE_MESH_MULTICAST)
2028 struct GNUNET_MESH_Multicast *mcast;
2030 mcast = (struct GNUNET_MESH_Multicast *) mdata->data;
2031 mcast->ttl = htonl (ntohl (mcast->ttl) - 1);
2033 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2034 "MESH: data packet, ttl: %u\n",
2035 ntohl (mcast->ttl));
2039 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2040 "MESH: not a data packet, no ttl\n");
2043 if (NULL != t->client)
2045 mdata->task = GNUNET_malloc (sizeof (GNUNET_SCHEDULER_TaskIdentifier));
2047 GNUNET_SCHEDULER_add_delayed (UNACKNOWLEDGED_WAIT, &client_allow_send,
2051 tree_iterate_children (t->tree, &tunnel_send_multicast_iterator, mdata);
2052 if (*(mdata->reference_counter) == 0)
2054 GNUNET_free (mdata->data);
2055 GNUNET_free (mdata->reference_counter);
2056 if (NULL != mdata->task)
2058 GNUNET_free (mdata->task);
2061 GNUNET_free (mdata);
2063 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2064 "MESH: sending a multicast packet done\n");
2071 * Send a message to all peers in this tunnel that the tunnel is no longer
2074 * @param t The tunnel whose peers to notify.
2077 tunnel_send_destroy (struct MeshTunnel *t)
2079 struct GNUNET_MESH_TunnelDestroy msg;
2081 msg.header.size = htons (sizeof (msg));
2082 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY);
2083 GNUNET_PEER_resolve (t->id.oid, &msg.oid);
2084 msg.tid = htonl (t->id.tid);
2085 tunnel_send_multicast (t, &msg.header);
2091 * Destroy the tunnel and free any allocated resources linked to it
2093 * @param t the tunnel to destroy
2095 * @return GNUNET_OK on success
2098 tunnel_destroy (struct MeshTunnel *t)
2100 struct MeshClient *c;
2101 struct MeshQueue *q;
2102 struct MeshQueue *qn;
2103 GNUNET_HashCode hash;
2112 struct GNUNET_PeerIdentity id;
2114 GNUNET_PEER_resolve (t->id.oid, &id);
2115 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: destroying tunnel %s [%x]\n",
2116 GNUNET_i2s (&id), t->id.tid);
2118 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: by client %u\n", c->id);
2122 GNUNET_CRYPTO_hash (&t->id, sizeof (struct MESH_TunnelID), &hash);
2123 if (GNUNET_YES != GNUNET_CONTAINER_multihashmap_remove (tunnels, &hash, t))
2128 GNUNET_CRYPTO_hash (&t->local_tid, sizeof (MESH_TunnelNumber), &hash);
2130 GNUNET_YES != GNUNET_CONTAINER_multihashmap_remove (c->tunnels, &hash, t))
2134 if (t->local_tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
2136 GNUNET_CRYPTO_hash (&t->local_tid, sizeof (MESH_TunnelNumber), &hash);
2137 GNUNET_break (GNUNET_YES ==
2138 GNUNET_CONTAINER_multihashmap_remove (incoming_tunnels, &hash,
2141 if (NULL != t->peers)
2143 GNUNET_CONTAINER_multihashmap_iterate (t->peers, &peer_info_delete_tunnel,
2145 GNUNET_CONTAINER_multihashmap_destroy (t->peers);
2150 if (NULL != q->data)
2151 GNUNET_free (q->data);
2155 /* TODO cancel core transmit ready in case it was active */
2157 tree_destroy (t->tree);
2158 if (NULL != t->dht_get_type)
2159 GNUNET_DHT_get_stop (t->dht_get_type);
2160 if (GNUNET_SCHEDULER_NO_TASK != t->timeout_task)
2161 GNUNET_SCHEDULER_cancel (t->timeout_task);
2162 if (GNUNET_SCHEDULER_NO_TASK != t->path_refresh_task)
2163 GNUNET_SCHEDULER_cancel (t->path_refresh_task);
2170 * Removes an explicit path from a tunnel, freeing all intermediate nodes
2171 * that are no longer needed, as well as nodes of no longer reachable peers.
2172 * The tunnel itself is also destoyed if results in a remote empty tunnel.
2174 * @param t Tunnel from which to remove the path.
2175 * @param p Peer which should be removed.
2178 tunnel_delete_peer (struct MeshTunnel *t, GNUNET_PEER_Id peer)
2180 if (GNUNET_NO == tree_del_peer (t->tree, peer, NULL, NULL))
2186 * tunnel_destroy_iterator: iterator for deleting each tunnel that belongs to a
2187 * client when the client disconnects.
2189 * @param cls closure (client that is disconnecting)
2190 * @param key the hash of the local tunnel id (used to access the hashmap)
2191 * @param value the value stored at the key (tunnel to destroy)
2193 * @return GNUNET_OK on success
2196 tunnel_destroy_iterator (void *cls, const GNUNET_HashCode * key, void *value)
2198 struct MeshTunnel *t = value;
2201 r = tunnel_destroy (t);
2207 * Timeout function, destroys tunnel if called
2209 * @param cls Closure (tunnel to destroy).
2210 * @param tc TaskContext
2213 tunnel_timeout (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
2215 struct MeshTunnel *t = cls;
2217 if (GNUNET_SCHEDULER_REASON_SHUTDOWN == tc->reason)
2219 t->timeout_task = GNUNET_SCHEDULER_NO_TASK;
2224 * Resets the tunnel timeout. Starts it if no timeout was running.
2226 * @param t Tunnel whose timeout to reset.
2229 tunnel_reset_timeout (struct MeshTunnel *t)
2231 if (GNUNET_SCHEDULER_NO_TASK != t->timeout_task)
2232 GNUNET_SCHEDULER_cancel (t->timeout_task);
2234 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_multiply
2235 (REFRESH_PATH_TIME, 4), &tunnel_timeout, t);
2239 /******************************************************************************/
2240 /**************** MESH NETWORK HANDLER HELPERS ***********************/
2241 /******************************************************************************/
2244 * Function called to notify a client about the socket
2245 * being ready to queue more data. "buf" will be
2246 * NULL and "size" zero if the socket was closed for
2247 * writing in the meantime.
2249 * @param cls closure
2250 * @param size number of bytes available in buf
2251 * @param buf where the callee should write the message
2252 * @return number of bytes written to buf
2255 send_core_create_path (void *cls, size_t size, void *buf)
2257 struct MeshPathInfo *info = cls;
2258 struct GNUNET_MESH_ManipulatePath *msg;
2259 struct GNUNET_PeerIdentity *peer_ptr;
2260 struct MeshPeerInfo *peer = info->peer;
2261 struct MeshTunnel *t = info->t;
2262 struct MeshPeerPath *p = info->path;
2266 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: CREATE PATH sending...\n");
2268 sizeof (struct GNUNET_MESH_ManipulatePath) +
2269 p->length * sizeof (struct GNUNET_PeerIdentity);
2271 if (size < size_needed || NULL == buf)
2273 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: create path retransmit!\n");
2274 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: buf: %p\n", buf);
2275 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: size: (%u/%u)\n", size,
2277 info->peer->core_transmit[info->pos] =
2278 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0,
2279 GNUNET_TIME_UNIT_FOREVER_REL,
2280 tree_get_first_hop (t->tree,
2282 size_needed, &send_core_create_path,
2286 info->peer->core_transmit[info->pos] = NULL;
2289 struct GNUNET_PeerIdentity id;
2291 GNUNET_PEER_resolve (peer->id, &id);
2292 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2293 "MESH: setting core_transmit %s [%u] to NULL\n",
2294 GNUNET_i2s (&id), info->pos);
2297 msg = (struct GNUNET_MESH_ManipulatePath *) buf;
2298 msg->header.size = htons (size_needed);
2299 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE);
2300 msg->tid = ntohl (t->id.tid);
2302 peer_ptr = (struct GNUNET_PeerIdentity *) &msg[1];
2303 for (i = 0; i < p->length; i++)
2305 GNUNET_PEER_resolve (p->peers[i], peer_ptr++);
2311 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2312 "MESH: CREATE PATH (%u bytes long) sent!\n", size_needed);
2318 * Function called to notify a client about the socket
2319 * being ready to queue more data. "buf" will be
2320 * NULL and "size" zero if the socket was closed for
2321 * writing in the meantime.
2323 * @param cls closure (data itself)
2324 * @param size number of bytes available in buf
2325 * @param buf where the callee should write the message
2327 * @return number of bytes written to buf
2330 send_core_data_multicast (void *cls, size_t size, void *buf)
2332 struct MeshDataDescriptor *info = cls;
2335 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Multicast callback.\n");
2336 GNUNET_assert (NULL != info);
2337 GNUNET_assert (NULL != info->peer);
2338 total_size = info->size;
2339 GNUNET_assert (total_size < GNUNET_SERVER_MAX_MESSAGE_SIZE);
2341 if (total_size > size)
2344 struct GNUNET_PeerIdentity id;
2346 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2347 "MESH: Multicast: retransmitting... (%u/%u)\n", size,
2349 GNUNET_PEER_resolve (info->peer->id, &id);
2350 info->peer->core_transmit[info->handler_n] =
2351 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0,
2352 GNUNET_TIME_UNIT_FOREVER_REL, &id,
2354 &send_core_data_multicast, info);
2357 info->peer->core_transmit[info->handler_n] = NULL;
2358 info->peer->infos[info->handler_n] = NULL;
2359 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: copying data...\n");
2360 memcpy (buf, info->data, total_size);
2363 struct GNUNET_MESH_Multicast *mc;
2364 struct GNUNET_MessageHeader *mh;
2367 if (ntohs (mh->type) == GNUNET_MESSAGE_TYPE_MESH_MULTICAST)
2369 mc = (struct GNUNET_MESH_Multicast *) mh;
2370 mh = (struct GNUNET_MessageHeader *) &mc[1];
2371 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2372 "MESH: multicast, payload type %u\n", ntohs (mh->type));
2373 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2374 "MESH: multicast, payload size %u\n", ntohs (mh->size));
2378 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: type %u\n",
2383 data_descriptor_decrement_multicast (info);
2384 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: freeing info...\n");
2386 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: return %u\n", total_size);
2392 * Function called to notify a client about the socket
2393 * being ready to queue more data. "buf" will be
2394 * NULL and "size" zero if the socket was closed for
2395 * writing in the meantime.
2397 * @param cls closure (MeshDataDescriptor)
2398 * @param size number of bytes available in buf
2399 * @param buf where the callee should write the message
2400 * @return number of bytes written to buf
2403 send_core_path_ack (void *cls, size_t size, void *buf)
2405 struct MeshDataDescriptor *info = cls;
2406 struct GNUNET_MESH_PathACK *msg = buf;
2408 GNUNET_assert (NULL != info);
2411 info->peer->core_transmit[info->handler_n] = NULL;
2413 if (sizeof (struct GNUNET_MESH_PathACK) > size)
2418 msg->header.size = htons (sizeof (struct GNUNET_MESH_PathACK));
2419 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_ACK);
2420 GNUNET_PEER_resolve (info->origin->oid, &msg->oid);
2421 msg->tid = htonl (info->origin->tid);
2422 msg->peer_id = my_full_id;
2424 /* TODO add signature */
2426 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: PATH ACK sent!\n");
2427 return sizeof (struct GNUNET_MESH_PathACK);
2431 /******************************************************************************/
2432 /******************** MESH NETWORK HANDLERS **************************/
2433 /******************************************************************************/
2437 * Core handler for path creation
2439 * @param cls closure
2440 * @param message message
2441 * @param peer peer identity this notification is about
2442 * @param atsi performance data
2443 * @param atsi_count number of records in 'atsi'
2445 * @return GNUNET_OK to keep the connection open,
2446 * GNUNET_SYSERR to close it (signal serious error)
2449 handle_mesh_path_create (void *cls, const struct GNUNET_PeerIdentity *peer,
2450 const struct GNUNET_MessageHeader *message,
2451 const struct GNUNET_ATS_Information *atsi,
2452 unsigned int atsi_count)
2454 unsigned int own_pos;
2457 MESH_TunnelNumber tid;
2458 struct GNUNET_MESH_ManipulatePath *msg;
2459 struct GNUNET_PeerIdentity *pi;
2460 GNUNET_HashCode hash;
2461 struct MeshPeerPath *path;
2462 struct MeshPeerInfo *dest_peer_info;
2463 struct MeshPeerInfo *orig_peer_info;
2464 struct MeshTunnel *t;
2466 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2467 "MESH: Received a path create msg [%s]\n",
2468 GNUNET_i2s (&my_full_id));
2469 size = ntohs (message->size);
2470 if (size < sizeof (struct GNUNET_MESH_ManipulatePath))
2472 GNUNET_break_op (0);
2476 size -= sizeof (struct GNUNET_MESH_ManipulatePath);
2477 if (size % sizeof (struct GNUNET_PeerIdentity))
2479 GNUNET_break_op (0);
2482 size /= sizeof (struct GNUNET_PeerIdentity);
2485 GNUNET_break_op (0);
2488 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: path has %u hops.\n", size);
2489 msg = (struct GNUNET_MESH_ManipulatePath *) message;
2491 tid = ntohl (msg->tid);
2492 pi = (struct GNUNET_PeerIdentity *) &msg[1];
2493 t = tunnel_get (pi, tid);
2494 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2495 "MESH: path is for tunnel %s [%X].\n", GNUNET_i2s (pi), tid);
2498 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Creating tunnel\n");
2499 t = GNUNET_malloc (sizeof (struct MeshTunnel));
2500 t->id.oid = GNUNET_PEER_intern (pi);
2502 while (NULL != tunnel_get_incoming (next_local_tid))
2503 next_local_tid = (next_local_tid + 1) | GNUNET_MESH_LOCAL_TUNNEL_ID_SERV;
2504 t->local_tid = next_local_tid++;
2505 next_local_tid = next_local_tid | GNUNET_MESH_LOCAL_TUNNEL_ID_SERV;
2506 t->tree = tree_new (t->id.oid);
2508 GNUNET_CRYPTO_hash (&t->id, sizeof (struct MESH_TunnelID), &hash);
2510 GNUNET_CONTAINER_multihashmap_put (tunnels, &hash, t,
2511 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST))
2517 tunnel_reset_timeout (t);
2518 GNUNET_CRYPTO_hash (&t->local_tid, sizeof (MESH_TunnelNumber), &hash);
2520 GNUNET_CONTAINER_multihashmap_put (incoming_tunnels, &hash, t,
2521 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST))
2529 GNUNET_CONTAINER_multihashmap_get (peers, &pi[size - 1].hashPubKey);
2530 if (NULL == dest_peer_info)
2532 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2533 "MESH: Creating PeerInfo for destination.\n");
2534 dest_peer_info = GNUNET_malloc (sizeof (struct MeshPeerInfo));
2535 dest_peer_info->id = GNUNET_PEER_intern (&pi[size - 1]);
2536 GNUNET_CONTAINER_multihashmap_put (peers, &pi[size - 1].hashPubKey,
2538 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
2540 orig_peer_info = GNUNET_CONTAINER_multihashmap_get (peers, &pi->hashPubKey);
2541 if (NULL == orig_peer_info)
2543 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2544 "MESH: Creating PeerInfo for origin.\n");
2545 orig_peer_info = GNUNET_malloc (sizeof (struct MeshPeerInfo));
2546 orig_peer_info->id = GNUNET_PEER_intern (pi);
2547 GNUNET_CONTAINER_multihashmap_put (peers, &pi->hashPubKey, orig_peer_info,
2548 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
2550 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Creating path...\n");
2551 path = path_new (size);
2553 for (i = 0; i < size; i++)
2555 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: ... adding %s\n",
2556 GNUNET_i2s (&pi[i]));
2557 path->peers[i] = GNUNET_PEER_intern (&pi[i]);
2558 if (path->peers[i] == myid)
2561 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Own position: %u\n", own_pos);
2564 /* cannot be self, must be 'not found' */
2565 /* create path: self not found in path through self */
2566 GNUNET_break_op (0);
2567 path_destroy (path);
2568 /* FIXME error. destroy tunnel? leave for timeout? */
2571 tunnel_add_path (t, path, own_pos);
2572 if (own_pos == size - 1)
2574 /* It is for us! Send ack. */
2575 struct MeshDataDescriptor *info;
2578 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: It's for us!\n");
2579 peer_info_add_path_to_origin (orig_peer_info, path, GNUNET_NO);
2580 if (NULL == t->peers)
2582 /* New tunnel! Notify clients! */
2583 struct GNUNET_MESH_TunnelNotification cmsg;
2585 cmsg.header.size = htons (sizeof (cmsg));
2586 cmsg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE);
2587 GNUNET_PEER_resolve (t->id.oid, &cmsg.peer);
2588 cmsg.tunnel_id = htonl (t->local_tid);
2589 GNUNET_SERVER_notification_context_broadcast (nc, &cmsg.header,
2592 t->peers = GNUNET_CONTAINER_multihashmap_create (4);
2594 GNUNET_break (GNUNET_OK ==
2595 GNUNET_CONTAINER_multihashmap_put (t->peers,
2596 &my_full_id.hashPubKey,
2599 GNUNET_CONTAINER_MULTIHASHMAPOPTION_REPLACE));
2600 /* FIXME use send_message */
2601 info = GNUNET_malloc (sizeof (struct MeshDataDescriptor));
2602 info->origin = &t->id;
2603 info->peer = GNUNET_CONTAINER_multihashmap_get (peers, &peer->hashPubKey);
2604 GNUNET_assert (NULL != info->peer);
2605 j = peer_info_transmit_slot (info->peer);
2606 info->handler_n = j;
2607 info->peer->types[j] = GNUNET_MESSAGE_TYPE_MESH_PATH_ACK;
2608 info->peer->infos[j] = info;
2609 info->peer->core_transmit[j] =
2610 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 100,
2611 GNUNET_TIME_UNIT_FOREVER_REL, peer,
2612 sizeof (struct GNUNET_MESH_PathACK),
2613 &send_core_path_ack, info);
2617 struct MeshPeerPath *path2;
2619 /* It's for somebody else! Retransmit. */
2620 path2 = path_duplicate (path);
2621 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Retransmitting.\n");
2622 peer_info_add_path (dest_peer_info, path2, GNUNET_NO);
2623 path2 = path_duplicate (path);
2624 peer_info_add_path_to_origin (orig_peer_info, path2, GNUNET_NO);
2625 send_create_path (dest_peer_info, path, t);
2632 * Core handler for path destruction
2634 * @param cls closure
2635 * @param message message
2636 * @param peer peer identity this notification is about
2637 * @param atsi performance data
2638 * @param atsi_count number of records in 'atsi'
2640 * @return GNUNET_OK to keep the connection open,
2641 * GNUNET_SYSERR to close it (signal serious error)
2644 handle_mesh_path_destroy (void *cls, const struct GNUNET_PeerIdentity *peer,
2645 const struct GNUNET_MessageHeader *message,
2646 const struct GNUNET_ATS_Information *atsi,
2647 unsigned int atsi_count)
2649 struct GNUNET_MESH_ManipulatePath *msg;
2650 struct GNUNET_PeerIdentity *pi;
2651 struct MeshPeerPath *path;
2652 struct MeshTunnel *t;
2653 unsigned int own_pos;
2657 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2658 "MESH: Received a PATH DESTROY msg from %s\n", GNUNET_i2s (peer));
2659 size = ntohs (message->size);
2660 if (size < sizeof (struct GNUNET_MESH_ManipulatePath))
2662 GNUNET_break_op (0);
2666 size -= sizeof (struct GNUNET_MESH_ManipulatePath);
2667 if (size % sizeof (struct GNUNET_PeerIdentity))
2669 GNUNET_break_op (0);
2672 size /= sizeof (struct GNUNET_PeerIdentity);
2675 GNUNET_break_op (0);
2678 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: path has %u hops.\n", size);
2680 msg = (struct GNUNET_MESH_ManipulatePath *) message;
2681 pi = (struct GNUNET_PeerIdentity *) &msg[1];
2682 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2683 "MESH: path is for tunnel %s [%X].\n", GNUNET_i2s (pi),
2685 t = tunnel_get (pi, ntohl (msg->tid));
2688 /* TODO notify back: we don't know this tunnel */
2689 GNUNET_break_op (0);
2692 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Creating path...\n");
2693 path = path_new (size);
2695 for (i = 0; i < size; i++)
2697 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: ... adding %s\n",
2698 GNUNET_i2s (&pi[i]));
2699 path->peers[i] = GNUNET_PEER_intern (&pi[i]);
2700 if (path->peers[i] == myid)
2703 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Own position: %u\n", own_pos);
2704 if (own_pos < path->length - 1)
2705 send_message (message, &pi[own_pos + 1]);
2706 tunnel_delete_peer (t, path->peers[path->length - 1]);
2707 path_destroy (path);
2713 * Core handler for notifications of broken paths
2715 * @param cls closure
2716 * @param message message
2717 * @param peer peer identity this notification is about
2718 * @param atsi performance data
2719 * @param atsi_count number of records in 'atsi'
2721 * @return GNUNET_OK to keep the connection open,
2722 * GNUNET_SYSERR to close it (signal serious error)
2725 handle_mesh_path_broken (void *cls, const struct GNUNET_PeerIdentity *peer,
2726 const struct GNUNET_MessageHeader *message,
2727 const struct GNUNET_ATS_Information *atsi,
2728 unsigned int atsi_count)
2730 struct GNUNET_MESH_PathBroken *msg;
2731 struct MeshTunnel *t;
2733 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2734 "MESH: Received a PATH BROKEN msg from %s\n", GNUNET_i2s (peer));
2735 msg = (struct GNUNET_MESH_PathBroken *) message;
2736 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: regarding %s\n",
2737 GNUNET_i2s (&msg->peer1));
2738 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: regarding %s\n",
2739 GNUNET_i2s (&msg->peer2));
2740 t = tunnel_get (&msg->oid, ntohl (msg->tid));
2743 GNUNET_break_op (0);
2746 tunnel_notify_connection_broken (t, GNUNET_PEER_search (&msg->peer1),
2747 GNUNET_PEER_search (&msg->peer2));
2754 * Core handler for tunnel destruction
2756 * @param cls closure
2757 * @param message message
2758 * @param peer peer identity this notification is about
2759 * @param atsi performance data
2760 * @param atsi_count number of records in 'atsi'
2762 * @return GNUNET_OK to keep the connection open,
2763 * GNUNET_SYSERR to close it (signal serious error)
2766 handle_mesh_tunnel_destroy (void *cls, const struct GNUNET_PeerIdentity *peer,
2767 const struct GNUNET_MessageHeader *message,
2768 const struct GNUNET_ATS_Information *atsi,
2769 unsigned int atsi_count)
2771 struct GNUNET_MESH_TunnelDestroy *msg;
2772 struct MeshTunnel *t;
2774 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2775 "MESH: Got a TUNNEL DESTROY packet from %s\n", GNUNET_i2s (peer));
2776 msg = (struct GNUNET_MESH_TunnelDestroy *) message;
2777 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: for tunnel %s [%u]\n",
2778 GNUNET_i2s (&msg->oid), ntohl (msg->tid));
2779 t = tunnel_get (&msg->oid, ntohl (msg->tid));
2782 /* Probably already got the message from another path,
2783 * destroyed the tunnel and retransmitted to children.
2788 if (t->id.oid == myid)
2790 GNUNET_break_op (0);
2793 if (t->local_tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
2795 /* Tunnel was incoming, notify clients */
2796 send_clients_tunnel_destroy (t);
2798 tunnel_send_destroy (t);
2805 * Core handler for mesh network traffic going from the origin to a peer
2807 * @param cls closure
2808 * @param peer peer identity this notification is about
2809 * @param message message
2810 * @param atsi performance data
2811 * @param atsi_count number of records in 'atsi'
2812 * @return GNUNET_OK to keep the connection open,
2813 * GNUNET_SYSERR to close it (signal serious error)
2816 handle_mesh_data_unicast (void *cls, const struct GNUNET_PeerIdentity *peer,
2817 const struct GNUNET_MessageHeader *message,
2818 const struct GNUNET_ATS_Information *atsi,
2819 unsigned int atsi_count)
2821 struct GNUNET_MESH_Unicast *msg;
2822 struct MeshTunnel *t;
2826 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: got a unicast packet from %s\n",
2828 size = ntohs (message->size);
2830 sizeof (struct GNUNET_MESH_Unicast) +
2831 sizeof (struct GNUNET_MessageHeader))
2836 msg = (struct GNUNET_MESH_Unicast *) message;
2837 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: of type %u\n",
2838 ntohs (msg[1].header.type));
2839 t = tunnel_get (&msg->oid, ntohl (msg->tid));
2842 /* TODO notify back: we don't know this tunnel */
2843 GNUNET_break_op (0);
2846 tunnel_reset_timeout (t);
2847 pid = GNUNET_PEER_search (&msg->destination);
2850 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2851 "MESH: it's for us! sending to clients...\n");
2852 send_subscribed_clients (message, (struct GNUNET_MessageHeader *) &msg[1]);
2855 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2856 "MESH: not for us, retransmitting...\n");
2857 send_message (message, tree_get_first_hop (t->tree, pid));
2863 * Core handler for mesh network traffic going from the origin to all peers
2865 * @param cls closure
2866 * @param message message
2867 * @param peer peer identity this notification is about
2868 * @param atsi performance data
2869 * @param atsi_count number of records in 'atsi'
2870 * @return GNUNET_OK to keep the connection open,
2871 * GNUNET_SYSERR to close it (signal serious error)
2873 * TODO: Check who we got this from, to validate route.
2876 handle_mesh_data_multicast (void *cls, const struct GNUNET_PeerIdentity *peer,
2877 const struct GNUNET_MessageHeader *message,
2878 const struct GNUNET_ATS_Information *atsi,
2879 unsigned int atsi_count)
2881 struct GNUNET_MESH_Multicast *msg;
2882 struct MeshTunnel *t;
2885 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: got a multicast packet from %s\n",
2887 size = ntohs (message->size);
2888 if (sizeof (struct GNUNET_MESH_Multicast) +
2889 sizeof (struct GNUNET_MessageHeader) > size)
2891 GNUNET_break_op (0);
2894 msg = (struct GNUNET_MESH_Multicast *) message;
2895 t = tunnel_get (&msg->oid, ntohl (msg->tid));
2899 /* TODO notify that we dont know that tunnel */
2900 GNUNET_break_op (0);
2903 if (t->mid == ntohl (msg->mid))
2905 /* FIXME: already seen this packet, log dropping */
2906 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2907 "MESH: Already seen mid %u, DROPPING!\n",
2914 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2915 "MESH: mid %u not seen yet, forwarding\n",
2919 t->mid = ntohl (msg->mid);
2920 tunnel_reset_timeout (t);
2922 /* Transmit to locally interested clients */
2923 if (NULL != t->peers &&
2924 GNUNET_CONTAINER_multihashmap_contains (t->peers, &my_full_id.hashPubKey))
2926 send_subscribed_clients (message, &msg[1].header);
2929 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2933 if (ntohl (msg->ttl) == 0)
2935 /* FIXME: ttl is 0, log dropping */
2936 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2937 "MESH: TTL is 0, DROPPING!\n");
2940 tunnel_send_multicast (t, message);
2946 * Core handler for mesh network traffic toward the owner of a tunnel
2948 * @param cls closure
2949 * @param message message
2950 * @param peer peer identity this notification is about
2951 * @param atsi performance data
2952 * @param atsi_count number of records in 'atsi'
2954 * @return GNUNET_OK to keep the connection open,
2955 * GNUNET_SYSERR to close it (signal serious error)
2958 handle_mesh_data_to_orig (void *cls, const struct GNUNET_PeerIdentity *peer,
2959 const struct GNUNET_MessageHeader *message,
2960 const struct GNUNET_ATS_Information *atsi,
2961 unsigned int atsi_count)
2963 struct GNUNET_MESH_ToOrigin *msg;
2964 struct GNUNET_PeerIdentity id;
2965 struct MeshPeerInfo *peer_info;
2966 struct MeshTunnel *t;
2969 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: got a ToOrigin packet from %s\n",
2971 size = ntohs (message->size);
2972 if (size < sizeof (struct GNUNET_MESH_ToOrigin) + /* Payload must be */
2973 sizeof (struct GNUNET_MessageHeader)) /* at least a header */
2975 GNUNET_break_op (0);
2978 msg = (struct GNUNET_MESH_ToOrigin *) message;
2979 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: of type %u\n",
2980 ntohs (msg[1].header.type));
2981 t = tunnel_get (&msg->oid, ntohl (msg->tid));
2985 /* TODO notify that we dont know this tunnel (whom)? */
2986 GNUNET_break_op (0);
2990 if (t->id.oid == myid)
2993 struct GNUNET_MESH_ToOrigin *copy;
2995 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2996 "MESH: it's for us! sending to clients...\n");
2997 if (NULL == t->client)
2999 /* got data packet for ownerless tunnel */
3000 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: no clients!\n");
3001 GNUNET_break_op (0);
3004 /* TODO signature verification */
3005 memcpy (cbuf, message, size);
3006 copy = (struct GNUNET_MESH_ToOrigin *) cbuf;
3007 copy->tid = htonl (t->local_tid);
3008 GNUNET_SERVER_notification_context_unicast (nc, t->client->handle,
3009 ©->header, GNUNET_YES);
3012 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3013 "MESH: not for us, retransmitting...\n");
3015 peer_info = peer_info_get (&msg->oid);
3016 if (NULL == peer_info)
3018 /* unknown origin of tunnel */
3022 GNUNET_PEER_resolve (tree_get_predecessor (t->tree), &id);
3023 send_message (message, &id);
3030 * Core handler for path ACKs
3032 * @param cls closure
3033 * @param message message
3034 * @param peer peer identity this notification is about
3035 * @param atsi performance data
3036 * @param atsi_count number of records in 'atsi'
3038 * @return GNUNET_OK to keep the connection open,
3039 * GNUNET_SYSERR to close it (signal serious error)
3042 handle_mesh_path_ack (void *cls, const struct GNUNET_PeerIdentity *peer,
3043 const struct GNUNET_MessageHeader *message,
3044 const struct GNUNET_ATS_Information *atsi,
3045 unsigned int atsi_count)
3047 struct GNUNET_MESH_PathACK *msg;
3048 struct GNUNET_PeerIdentity id;
3049 struct MeshPeerInfo *peer_info;
3050 struct MeshTunnel *t;
3052 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Received a path ACK msg [%s]\n",
3053 GNUNET_i2s (&my_full_id));
3054 msg = (struct GNUNET_MESH_PathACK *) message;
3055 t = tunnel_get (&msg->oid, msg->tid);
3058 /* TODO notify that we don't know the tunnel */
3062 /* Message for us? */
3063 if (0 == memcmp (&msg->oid, &my_full_id, sizeof (struct GNUNET_PeerIdentity)))
3065 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: It's for us!\n");
3066 if (NULL == t->client)
3068 GNUNET_break_op (0);
3071 if (NULL != t->dht_get_type)
3073 GNUNET_DHT_get_stop (t->dht_get_type);
3074 t->dht_get_type = NULL;
3076 peer_info = peer_info_get (&msg->peer_id);
3077 tree_set_status (t->tree, peer_info->id, MESH_PEER_READY);
3078 send_client_peer_connected (t, peer_info->id);
3082 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3083 "MESH: not for us, retransmitting...\n");
3084 GNUNET_PEER_resolve (tree_get_predecessor (t->tree), &id);
3085 peer_info = peer_info_get (&msg->oid);
3086 if (NULL == peer_info)
3088 /* If we know the tunnel, we should DEFINITELY know the peer */
3092 send_message (message, &id);
3098 * Functions to handle messages from core
3100 static struct GNUNET_CORE_MessageHandler core_handlers[] = {
3101 {&handle_mesh_path_create, GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE, 0},
3102 {&handle_mesh_path_destroy, GNUNET_MESSAGE_TYPE_MESH_PATH_DESTROY, 0},
3103 {&handle_mesh_path_broken, GNUNET_MESSAGE_TYPE_MESH_PATH_BROKEN,
3104 sizeof (struct GNUNET_MESH_PathBroken)},
3105 {&handle_mesh_tunnel_destroy, GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY, 0},
3106 {&handle_mesh_data_unicast, GNUNET_MESSAGE_TYPE_MESH_UNICAST, 0},
3107 {&handle_mesh_data_multicast, GNUNET_MESSAGE_TYPE_MESH_MULTICAST, 0},
3108 {&handle_mesh_data_to_orig, GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN, 0},
3109 {&handle_mesh_path_ack, GNUNET_MESSAGE_TYPE_MESH_PATH_ACK,
3110 sizeof (struct GNUNET_MESH_PathACK)},
3116 /******************************************************************************/
3117 /**************** MESH LOCAL HANDLER HELPERS ***********************/
3118 /******************************************************************************/
3121 * deregister_app: iterator for removing each application registered by a client
3123 * @param cls closure
3124 * @param key the hash of the application id (used to access the hashmap)
3125 * @param value the value stored at the key (client)
3127 * @return GNUNET_OK on success
3130 deregister_app (void *cls, const GNUNET_HashCode * key, void *value)
3132 GNUNET_break (GNUNET_YES ==
3133 GNUNET_CONTAINER_multihashmap_remove (applications, key,
3140 * notify_client_connection_failure: notify a client that the connection to the
3141 * requested remote peer is not possible (for instance, no route found)
3142 * Function called when the socket is ready to queue more data. "buf" will be
3143 * NULL and "size" zero if the socket was closed for writing in the meantime.
3145 * @param cls closure
3146 * @param size number of bytes available in buf
3147 * @param buf where the callee should write the message
3148 * @return number of bytes written to buf
3151 notify_client_connection_failure (void *cls, size_t size, void *buf)
3154 struct MeshPeerInfo *peer_info;
3155 struct GNUNET_MESH_PeerControl *msg;
3156 struct GNUNET_PeerIdentity id;
3158 if (0 == size && NULL == buf)
3160 // TODO retry? cancel?
3164 size_needed = sizeof (struct GNUNET_MESH_PeerControl);
3165 peer_info = (struct MeshPeerInfo *) cls;
3166 msg = (struct GNUNET_MESH_PeerControl *) buf;
3167 msg->header.size = htons (sizeof (struct GNUNET_MESH_PeerControl));
3168 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_DISCONNECTED);
3169 // msg->tunnel_id = htonl(peer_info->t->tid);
3170 GNUNET_PEER_resolve (peer_info->id, &id);
3171 memcpy (&msg->peer, &id, sizeof (struct GNUNET_PeerIdentity));
3179 * Send keepalive packets for a peer
3181 * @param cls Closure (tunnel for which to send the keepalive).
3182 * @param tc Notification context.
3184 * TODO: implement explicit multicast keepalive?
3187 path_refresh (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
3189 struct MeshTunnel *t = cls;
3190 struct GNUNET_MessageHeader *payload;
3191 struct GNUNET_MESH_Multicast *msg;
3193 sizeof (struct GNUNET_MESH_Multicast) +
3194 sizeof (struct GNUNET_MessageHeader);
3197 if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN)
3201 t->path_refresh_task = GNUNET_SCHEDULER_NO_TASK;
3203 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3204 "MESH: sending keepalive for tunnel %d\n", t->id.tid);
3206 msg = (struct GNUNET_MESH_Multicast *) cbuf;
3207 msg->header.size = htons (size);
3208 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_MULTICAST);
3209 msg->oid = my_full_id;
3210 msg->tid = htonl (t->id.tid);
3211 payload = (struct GNUNET_MessageHeader *) &msg[1];
3212 payload->size = htons (sizeof (struct GNUNET_MessageHeader));
3213 payload->type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_KEEPALIVE);
3214 tunnel_send_multicast (t, &msg->header);
3216 t->path_refresh_task =
3217 GNUNET_SCHEDULER_add_delayed (REFRESH_PATH_TIME, &path_refresh, t);
3223 * Function to process paths received for a new peer addition. The recorded
3224 * paths form the initial tunnel, which can be optimized later.
3225 * Called on each result obtained for the DHT search.
3227 * @param cls closure
3228 * @param exp when will this value expire
3229 * @param key key of the result
3230 * @param type type of the result
3231 * @param size number of bytes in data
3232 * @param data pointer to the result data
3234 * TODO: re-issue the request after certain time? cancel after X results?
3237 dht_get_id_handler (void *cls, struct GNUNET_TIME_Absolute exp,
3238 const GNUNET_HashCode * key,
3239 const struct GNUNET_PeerIdentity *get_path,
3240 unsigned int get_path_length,
3241 const struct GNUNET_PeerIdentity *put_path,
3242 unsigned int put_path_length, enum GNUNET_BLOCK_Type type,
3243 size_t size, const void *data)
3245 struct MeshPathInfo *path_info = cls;
3246 struct MeshPeerPath *p;
3247 struct GNUNET_PeerIdentity pi;
3250 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Got results from DHT!\n");
3251 GNUNET_PEER_resolve (path_info->peer->id, &pi);
3252 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: for %s\n", GNUNET_i2s (&pi));
3253 // GNUNET_DHT_get_stop(path_info->peer->dhtget);
3254 // path_info->peer->dhtget = NULL;
3256 p = path_build_from_dht (get_path, get_path_length, put_path,
3258 peer_info_add_path (path_info->peer, p, GNUNET_NO);
3259 for (i = 0; i < path_info->peer->ntunnels; i++)
3261 tunnel_add_peer (path_info->peer->tunnels[i], path_info->peer);
3262 peer_info_connect (path_info->peer, path_info->t);
3264 // GNUNET_free (path_info);
3271 * Function to process paths received for a new peer addition. The recorded
3272 * paths form the initial tunnel, which can be optimized later.
3273 * Called on each result obtained for the DHT search.
3275 * @param cls closure
3276 * @param exp when will this value expire
3277 * @param key key of the result
3278 * @param type type of the result
3279 * @param size number of bytes in data
3280 * @param data pointer to the result data
3283 dht_get_type_handler (void *cls, struct GNUNET_TIME_Absolute exp,
3284 const GNUNET_HashCode * key,
3285 const struct GNUNET_PeerIdentity *get_path,
3286 unsigned int get_path_length,
3287 const struct GNUNET_PeerIdentity *put_path,
3288 unsigned int put_path_length, enum GNUNET_BLOCK_Type type,
3289 size_t size, const void *data)
3291 const struct GNUNET_PeerIdentity *pi = data;
3292 struct MeshTunnel *t = cls;
3293 struct MeshPeerInfo *peer_info;
3294 struct MeshPeerPath *p;
3296 if (size != sizeof (struct GNUNET_PeerIdentity))
3298 GNUNET_break_op (0);
3301 GNUNET_assert (NULL != t->client);
3302 peer_info = peer_info_get (pi);
3303 (void) GNUNET_CONTAINER_multihashmap_put (t->peers, &pi->hashPubKey,
3305 GNUNET_CONTAINER_MULTIHASHMAPOPTION_REPLACE);
3307 p = path_build_from_dht (get_path, get_path_length, put_path,
3309 peer_info_add_path (peer_info, p, GNUNET_NO);
3310 tunnel_add_peer (t, peer_info);
3311 peer_info_connect (peer_info, t);
3315 /******************************************************************************/
3316 /********************* MESH LOCAL HANDLES **************************/
3317 /******************************************************************************/
3321 * Handler for client disconnection
3323 * @param cls closure
3324 * @param client identification of the client; NULL
3325 * for the last call when the server is destroyed
3328 handle_local_client_disconnect (void *cls, struct GNUNET_SERVER_Client *client)
3330 struct MeshClient *c;
3331 struct MeshClient *next;
3333 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: client disconnected\n");
3336 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: (SERVER DOWN)\n");
3342 if (c->handle != client && NULL != client)
3344 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: ... searching\n");
3348 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: matching client found\n");
3349 GNUNET_SERVER_client_drop (c->handle);
3350 if (NULL != c->tunnels)
3352 GNUNET_CONTAINER_multihashmap_iterate (c->tunnels,
3353 &tunnel_destroy_iterator, c);
3354 GNUNET_CONTAINER_multihashmap_destroy (c->tunnels);
3357 /* deregister clients applications */
3358 if (NULL != c->apps)
3360 GNUNET_CONTAINER_multihashmap_iterate (c->apps, &deregister_app, NULL);
3361 GNUNET_CONTAINER_multihashmap_destroy (c->apps);
3363 if (0 == GNUNET_CONTAINER_multihashmap_size (applications) &&
3364 GNUNET_SCHEDULER_NO_TASK != announce_applications_task)
3366 GNUNET_SCHEDULER_cancel (announce_applications_task);
3367 announce_applications_task = GNUNET_SCHEDULER_NO_TASK;
3369 if (NULL != c->types)
3370 GNUNET_CONTAINER_multihashmap_destroy (c->types);
3372 GNUNET_CONTAINER_DLL_remove (clients, clients_tail, c);
3373 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: CLIENT FREE at %p\n", c);
3378 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: done!\n");
3384 * Handler for new clients
3386 * @param cls closure
3387 * @param client identification of the client
3388 * @param message the actual message, which includes messages the client wants
3391 handle_local_new_client (void *cls, struct GNUNET_SERVER_Client *client,
3392 const struct GNUNET_MessageHeader *message)
3394 struct GNUNET_MESH_ClientConnect *cc_msg;
3395 struct MeshClient *c;
3396 GNUNET_MESH_ApplicationType *a;
3403 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: new client connected\n");
3404 /* Check data sanity */
3405 size = ntohs (message->size) - sizeof (struct GNUNET_MESH_ClientConnect);
3406 cc_msg = (struct GNUNET_MESH_ClientConnect *) message;
3407 ntypes = ntohs (cc_msg->types);
3408 napps = ntohs (cc_msg->applications);
3410 ntypes * sizeof (uint16_t) + napps * sizeof (GNUNET_MESH_ApplicationType))
3413 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3417 /* Create new client structure */
3418 c = GNUNET_malloc (sizeof (struct MeshClient));
3420 c->id = next_client_id++;
3421 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: CLIENT NEW %u at %p\n", c->id,
3425 GNUNET_SERVER_client_keep (client);
3426 a = (GNUNET_MESH_ApplicationType *) &cc_msg[1];
3429 GNUNET_MESH_ApplicationType at;
3432 c->apps = GNUNET_CONTAINER_multihashmap_create (napps);
3433 for (i = 0; i < napps; i++)
3436 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: app type: %u\n", at);
3437 GNUNET_CRYPTO_hash (&at, sizeof (at), &hc);
3438 /* store in clients hashmap */
3439 GNUNET_CONTAINER_multihashmap_put (c->apps, &hc, c,
3440 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
3441 /* store in global hashmap, for announcements */
3442 GNUNET_CONTAINER_multihashmap_put (applications, &hc, c,
3443 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
3445 if (GNUNET_SCHEDULER_NO_TASK == announce_applications_task)
3446 announce_applications_task =
3447 GNUNET_SCHEDULER_add_now (&announce_applications, NULL);
3455 t = (uint16_t *) & a[napps];
3456 c->types = GNUNET_CONTAINER_multihashmap_create (ntypes);
3457 for (i = 0; i < ntypes; i++)
3460 GNUNET_CRYPTO_hash (&u16, sizeof (u16), &hc);
3462 /* store in clients hashmap */
3463 GNUNET_CONTAINER_multihashmap_put (c->types, &hc, c,
3464 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
3465 /* store in global hashmap */
3466 GNUNET_CONTAINER_multihashmap_put (types, &hc, c,
3467 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
3470 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3471 "MESH: client has %u+%u subscriptions\n", napps, ntypes);
3473 GNUNET_CONTAINER_DLL_insert (clients, clients_tail, c);
3474 c->tunnels = GNUNET_CONTAINER_multihashmap_create (32);
3475 GNUNET_SERVER_notification_context_add (nc, client);
3477 GNUNET_SERVER_receive_done (client, GNUNET_OK);
3479 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: new client processed\n");
3485 * Handler for requests of new tunnels
3487 * @param cls closure
3488 * @param client identification of the client
3489 * @param message the actual message
3492 handle_local_tunnel_create (void *cls, struct GNUNET_SERVER_Client *client,
3493 const struct GNUNET_MessageHeader *message)
3495 struct GNUNET_MESH_TunnelMessage *t_msg;
3496 struct MeshTunnel *t;
3497 struct MeshClient *c;
3498 GNUNET_HashCode hash;
3500 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: new tunnel requested\n");
3502 /* Sanity check for client registration */
3503 if (NULL == (c = client_get (client)))
3506 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3510 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: by client %u\n", c->id);
3513 /* Message sanity check */
3514 if (sizeof (struct GNUNET_MESH_TunnelMessage) != ntohs (message->size))
3517 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3521 t_msg = (struct GNUNET_MESH_TunnelMessage *) message;
3522 /* Sanity check for tunnel numbering */
3523 if (0 == (ntohl (t_msg->tunnel_id) & GNUNET_MESH_LOCAL_TUNNEL_ID_CLI))
3526 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3529 /* Sanity check for duplicate tunnel IDs */
3530 if (NULL != tunnel_get_by_local_id (c, ntohl (t_msg->tunnel_id)))
3533 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3537 t = GNUNET_malloc (sizeof (struct MeshTunnel));
3538 while (NULL != tunnel_get_by_pi (myid, next_tid))
3539 next_tid = (next_tid + 1) & ~GNUNET_MESH_LOCAL_TUNNEL_ID_CLI;
3540 t->id.tid = next_tid++;
3541 next_tid = next_tid & ~GNUNET_MESH_LOCAL_TUNNEL_ID_CLI;
3543 t->local_tid = ntohl (t_msg->tunnel_id);
3545 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: CREATED TUNNEL %s [%x] (%x)\n",
3546 GNUNET_i2s (&my_full_id), t->id.tid, t->local_tid);
3549 t->peers = GNUNET_CONTAINER_multihashmap_create (32);
3551 GNUNET_CRYPTO_hash (&t->local_tid, sizeof (MESH_TunnelNumber), &hash);
3553 GNUNET_CONTAINER_multihashmap_put (c->tunnels, &hash, t,
3554 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
3557 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3561 GNUNET_CRYPTO_hash (&t->id, sizeof (struct MESH_TunnelID), &hash);
3563 GNUNET_CONTAINER_multihashmap_put (tunnels, &hash, t,
3564 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
3567 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3570 t->tree = tree_new (myid);
3572 GNUNET_SERVER_receive_done (client, GNUNET_OK);
3578 * Handler for requests of deleting tunnels
3580 * @param cls closure
3581 * @param client identification of the client
3582 * @param message the actual message
3585 handle_local_tunnel_destroy (void *cls, struct GNUNET_SERVER_Client *client,
3586 const struct GNUNET_MessageHeader *message)
3588 struct GNUNET_MESH_TunnelMessage *tunnel_msg;
3589 struct MeshClient *c;
3590 struct MeshTunnel *t;
3591 MESH_TunnelNumber tid;
3592 GNUNET_HashCode hash;
3594 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3595 "MESH: Got a DESTROY TUNNEL from client!\n");
3597 /* Sanity check for client registration */
3598 if (NULL == (c = client_get (client)))
3601 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3604 /* Message sanity check */
3605 if (sizeof (struct GNUNET_MESH_TunnelMessage) != ntohs (message->size))
3608 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3612 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: by client %u\n", c->id);
3614 tunnel_msg = (struct GNUNET_MESH_TunnelMessage *) message;
3616 /* Retrieve tunnel */
3617 tid = ntohl (tunnel_msg->tunnel_id);
3619 /* Remove from local id hashmap */
3620 GNUNET_CRYPTO_hash (&tid, sizeof (MESH_TunnelNumber), &hash);
3621 t = GNUNET_CONTAINER_multihashmap_get (c->tunnels, &hash);
3622 GNUNET_assert (GNUNET_YES ==
3623 GNUNET_CONTAINER_multihashmap_remove (c->tunnels, &hash, t));
3626 tunnel_send_destroy (t);
3628 GNUNET_SERVER_receive_done (client, GNUNET_OK);
3634 * Handler for connection requests to new peers
3636 * @param cls closure
3637 * @param client identification of the client
3638 * @param message the actual message (PeerControl)
3641 handle_local_connect_add (void *cls, struct GNUNET_SERVER_Client *client,
3642 const struct GNUNET_MessageHeader *message)
3644 struct GNUNET_MESH_PeerControl *peer_msg;
3645 struct MeshPeerInfo *peer_info;
3646 struct MeshClient *c;
3647 struct MeshTunnel *t;
3648 MESH_TunnelNumber tid;
3650 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Got connection request\n");
3651 /* Sanity check for client registration */
3652 if (NULL == (c = client_get (client)))
3655 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3659 peer_msg = (struct GNUNET_MESH_PeerControl *) message;
3660 /* Sanity check for message size */
3661 if (sizeof (struct GNUNET_MESH_PeerControl) != ntohs (peer_msg->header.size))
3664 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3668 /* Tunnel exists? */
3669 tid = ntohl (peer_msg->tunnel_id);
3670 t = tunnel_get_by_local_id (c, tid);
3674 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3678 /* Does client own tunnel? */
3679 if (t->client->handle != client)
3682 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3685 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: for %s\n",
3686 GNUNET_i2s (&peer_msg->peer));
3687 peer_info = peer_info_get (&peer_msg->peer);
3689 tunnel_add_peer (t, peer_info);
3690 peer_info_connect (peer_info, t);
3692 GNUNET_SERVER_receive_done (client, GNUNET_OK);
3698 * Handler for disconnection requests of peers in a tunnel
3700 * @param cls closure
3701 * @param client identification of the client
3702 * @param message the actual message (PeerControl)
3705 handle_local_connect_del (void *cls, struct GNUNET_SERVER_Client *client,
3706 const struct GNUNET_MessageHeader *message)
3708 struct GNUNET_MESH_PeerControl *peer_msg;
3709 struct MeshPeerInfo *peer_info;
3710 struct MeshClient *c;
3711 struct MeshTunnel *t;
3712 MESH_TunnelNumber tid;
3714 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Got a PEER DEL request\n");
3715 /* Sanity check for client registration */
3716 if (NULL == (c = client_get (client)))
3719 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3722 peer_msg = (struct GNUNET_MESH_PeerControl *) message;
3723 /* Sanity check for message size */
3724 if (sizeof (struct GNUNET_MESH_PeerControl) != ntohs (peer_msg->header.size))
3727 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3731 /* Tunnel exists? */
3732 tid = ntohl (peer_msg->tunnel_id);
3733 t = tunnel_get_by_local_id (c, tid);
3737 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3740 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: on tunnel %X\n", t->id.tid);
3742 /* Does client own tunnel? */
3743 if (t->client->handle != client)
3746 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3750 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: for peer %s\n",
3751 GNUNET_i2s (&peer_msg->peer));
3752 /* Is the peer in the tunnel? */
3754 GNUNET_CONTAINER_multihashmap_get (t->peers, &peer_msg->peer.hashPubKey);
3755 if (NULL == peer_info)
3758 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3762 /* Ok, delete peer from tunnel */
3763 GNUNET_CONTAINER_multihashmap_remove_all (t->peers,
3764 &peer_msg->peer.hashPubKey);
3766 send_destroy_path (t, peer_info->id);
3767 tunnel_delete_peer (t, peer_info->id);
3768 GNUNET_SERVER_receive_done (client, GNUNET_OK);
3774 * Handler for connection requests to new peers by type
3776 * @param cls closure
3777 * @param client identification of the client
3778 * @param message the actual message (ConnectPeerByType)
3781 handle_local_connect_by_type (void *cls, struct GNUNET_SERVER_Client *client,
3782 const struct GNUNET_MessageHeader *message)
3784 struct GNUNET_MESH_ConnectPeerByType *connect_msg;
3785 struct MeshClient *c;
3786 struct MeshTunnel *t;
3787 GNUNET_HashCode hash;
3788 MESH_TunnelNumber tid;
3790 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: got connect by type request\n");
3791 /* Sanity check for client registration */
3792 if (NULL == (c = client_get (client)))
3795 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3799 connect_msg = (struct GNUNET_MESH_ConnectPeerByType *) message;
3800 /* Sanity check for message size */
3801 if (sizeof (struct GNUNET_MESH_ConnectPeerByType) !=
3802 ntohs (connect_msg->header.size))
3805 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3809 /* Tunnel exists? */
3810 tid = ntohl (connect_msg->tunnel_id);
3811 t = tunnel_get_by_local_id (c, tid);
3815 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3819 /* Does client own tunnel? */
3820 if (t->client->handle != client)
3823 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3827 /* Do WE have the service? */
3828 t->type = ntohl (connect_msg->type);
3829 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: type requested: %u\n", t->type);
3830 GNUNET_CRYPTO_hash (&t->type, sizeof (GNUNET_MESH_ApplicationType), &hash);
3831 if (GNUNET_CONTAINER_multihashmap_contains (applications, &hash) ==
3834 /* Yes! Fast forward, add ourselves to the tunnel and send the
3835 * good news to the client
3837 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: available locally\n");
3838 GNUNET_CONTAINER_multihashmap_put (t->peers, &my_full_id.hashPubKey,
3839 peer_info_get (&my_full_id),
3840 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
3842 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: notifying client\n");
3843 send_client_peer_connected (t, myid);
3844 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Done\n");
3845 GNUNET_SERVER_receive_done (client, GNUNET_OK);
3848 /* Ok, lets find a peer offering the service */
3849 if (NULL != t->dht_get_type)
3851 GNUNET_DHT_get_stop (t->dht_get_type);
3853 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: looking in DHT for %s\n",
3854 GNUNET_h2s (&hash));
3856 GNUNET_DHT_get_start (dht_handle, GNUNET_TIME_UNIT_FOREVER_REL,
3857 GNUNET_BLOCK_TYPE_TEST, &hash, 10U,
3858 GNUNET_DHT_RO_RECORD_ROUTE |
3859 GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE, NULL, 0,
3860 &dht_get_type_handler, t);
3862 GNUNET_SERVER_receive_done (client, GNUNET_OK);
3868 * Handler for client traffic directed to one peer
3870 * @param cls closure
3871 * @param client identification of the client
3872 * @param message the actual message
3875 handle_local_unicast (void *cls, struct GNUNET_SERVER_Client *client,
3876 const struct GNUNET_MessageHeader *message)
3878 struct MeshClient *c;
3879 struct MeshTunnel *t;
3880 struct MeshPeerInfo *pi;
3881 struct GNUNET_MESH_Unicast *data_msg;
3882 MESH_TunnelNumber tid;
3885 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3886 "MESH: Got a unicast request from a client!\n");
3888 /* Sanity check for client registration */
3889 if (NULL == (c = client_get (client)))
3892 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3895 data_msg = (struct GNUNET_MESH_Unicast *) message;
3896 /* Sanity check for message size */
3897 size = ntohs (message->size);
3898 if (sizeof (struct GNUNET_MESH_Unicast) +
3899 sizeof (struct GNUNET_MessageHeader) > size)
3902 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3906 /* Tunnel exists? */
3907 tid = ntohl (data_msg->tid);
3908 t = tunnel_get_by_local_id (c, tid);
3912 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3916 /* Is it a local tunnel? Then, does client own the tunnel? */
3917 if (NULL != t->client && NULL != t->client->handle &&
3918 t->client->handle != client)
3921 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3925 pi = GNUNET_CONTAINER_multihashmap_get (t->peers,
3926 &data_msg->destination.hashPubKey);
3927 /* Is the selected peer in the tunnel? */
3931 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3935 /* Ok, everything is correct, send the message
3936 * (pretend we got it from a mesh peer)
3939 char buf[ntohs (message->size)];
3940 struct GNUNET_MESH_Unicast *copy;
3942 /* Work around const limitation */
3943 copy = (struct GNUNET_MESH_Unicast *) buf;
3944 memcpy (buf, data_msg, size);
3945 copy->oid = my_full_id;
3946 copy->tid = htonl (t->id.tid);
3947 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3948 "MESH: calling generic handler...\n");
3949 handle_mesh_data_unicast (NULL, &my_full_id, ©->header, NULL, 0);
3951 GNUNET_SERVER_receive_done (client, GNUNET_OK);
3957 * Handler for client traffic directed to the origin
3959 * @param cls closure
3960 * @param client identification of the client
3961 * @param message the actual message
3964 handle_local_to_origin (void *cls, struct GNUNET_SERVER_Client *client,
3965 const struct GNUNET_MessageHeader *message)
3967 struct GNUNET_MESH_ToOrigin *data_msg;
3968 struct GNUNET_PeerIdentity id;
3969 struct MeshClient *c;
3970 struct MeshTunnel *t;
3971 MESH_TunnelNumber tid;
3974 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3975 "MESH: Got a ToOrigin request from a client!\n");
3977 /* Sanity check for client registration */
3978 if (NULL == (c = client_get (client)))
3981 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3984 data_msg = (struct GNUNET_MESH_ToOrigin *) message;
3985 /* Sanity check for message size */
3986 size = ntohs (message->size);
3987 if (sizeof (struct GNUNET_MESH_ToOrigin) +
3988 sizeof (struct GNUNET_MessageHeader) > size)
3991 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3995 /* Tunnel exists? */
3996 tid = ntohl (data_msg->tid);
3997 if (tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
4000 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4003 t = tunnel_get_by_local_id (c, tid);
4007 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4011 /* It shouldn't be a local tunnel. */
4012 if (NULL != t->client)
4015 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4018 GNUNET_PEER_resolve (t->id.oid, &id);
4020 /* Ok, everything is correct, send the message
4021 * (pretend we got it from a mesh peer)
4024 char buf[ntohs (message->size)];
4025 struct GNUNET_MESH_ToOrigin *copy;
4027 /* Work around const limitation */
4028 copy = (struct GNUNET_MESH_ToOrigin *) buf;
4029 memcpy (buf, data_msg, size);
4031 copy->tid = htonl (t->id.tid);
4032 copy->sender = my_full_id;
4033 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4034 "MESH: calling generic handler...\n");
4035 handle_mesh_data_to_orig (NULL, &my_full_id, ©->header, NULL, 0);
4037 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4043 * Handler for client traffic directed to all peers in a tunnel
4045 * @param cls closure
4046 * @param client identification of the client
4047 * @param message the actual message
4050 handle_local_multicast (void *cls, struct GNUNET_SERVER_Client *client,
4051 const struct GNUNET_MessageHeader *message)
4053 struct MeshClient *c;
4054 struct MeshTunnel *t;
4055 struct GNUNET_MESH_Multicast *data_msg;
4056 MESH_TunnelNumber tid;
4058 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4059 "MESH: Got a multicast request from a client!\n");
4061 /* Sanity check for client registration */
4062 if (NULL == (c = client_get (client)))
4065 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4068 data_msg = (struct GNUNET_MESH_Multicast *) message;
4069 /* Sanity check for message size */
4070 if (sizeof (struct GNUNET_MESH_Multicast) +
4071 sizeof (struct GNUNET_MessageHeader) > ntohs (data_msg->header.size))
4074 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4078 /* Tunnel exists? */
4079 tid = ntohl (data_msg->tid);
4080 t = tunnel_get_by_local_id (c, tid);
4084 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4088 /* Does client own tunnel? */
4089 if (t->client->handle != client)
4092 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4097 char buf[ntohs (message->size)];
4098 struct GNUNET_MESH_Multicast *copy;
4100 copy = (struct GNUNET_MESH_Multicast *) buf;
4101 memcpy (buf, message, ntohs (message->size));
4102 copy->oid = my_full_id;
4103 copy->tid = htonl (t->id.tid);
4104 copy->ttl = htonl (DEFAULT_TTL);
4105 copy->mid = htonl (t->mid + 1);
4106 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4107 "MESH: calling generic handler...\n");
4108 handle_mesh_data_multicast (client, &my_full_id, ©->header, NULL, 0);
4111 /* receive done gets called when last copy is sent to a neighbor */
4116 * Functions to handle messages from clients
4118 static struct GNUNET_SERVER_MessageHandler client_handlers[] = {
4119 {&handle_local_new_client, NULL,
4120 GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT, 0},
4121 {&handle_local_tunnel_create, NULL,
4122 GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE,
4123 sizeof (struct GNUNET_MESH_TunnelMessage)},
4124 {&handle_local_tunnel_destroy, NULL,
4125 GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY,
4126 sizeof (struct GNUNET_MESH_TunnelMessage)},
4127 {&handle_local_connect_add, NULL,
4128 GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD,
4129 sizeof (struct GNUNET_MESH_PeerControl)},
4130 {&handle_local_connect_del, NULL,
4131 GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_DEL,
4132 sizeof (struct GNUNET_MESH_PeerControl)},
4133 {&handle_local_connect_by_type, NULL,
4134 GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD_BY_TYPE,
4135 sizeof (struct GNUNET_MESH_ConnectPeerByType)},
4136 {&handle_local_unicast, NULL,
4137 GNUNET_MESSAGE_TYPE_MESH_UNICAST, 0},
4138 {&handle_local_to_origin, NULL,
4139 GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN, 0},
4140 {&handle_local_multicast, NULL,
4141 GNUNET_MESSAGE_TYPE_MESH_MULTICAST, 0},
4147 * To be called on core init/fail.
4149 * @param cls service closure
4150 * @param server handle to the server for this service
4151 * @param identity the public identity of this peer
4154 core_init (void *cls, struct GNUNET_CORE_Handle *server,
4155 const struct GNUNET_PeerIdentity *identity)
4157 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Core init\n");
4158 core_handle = server;
4159 if (0 != memcmp (identity, &my_full_id, sizeof (my_full_id)) ||
4162 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, _("MESH: Wrong CORE service\n"));
4163 GNUNET_SCHEDULER_shutdown ();
4169 * Method called whenever a given peer connects.
4171 * @param cls closure
4172 * @param peer peer identity this notification is about
4173 * @param atsi performance data for the connection
4174 * @param atsi_count number of records in 'atsi'
4177 core_connect (void *cls, const struct GNUNET_PeerIdentity *peer,
4178 const struct GNUNET_ATS_Information *atsi,
4179 unsigned int atsi_count)
4181 struct MeshPeerInfo *peer_info;
4182 struct MeshPeerPath *path;
4184 #if MESH_DEBUG_CONNECTION
4185 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Peer connected\n");
4186 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: %s\n",
4187 GNUNET_i2s (&my_full_id));
4189 peer_info = peer_info_get (peer);
4190 if (myid == peer_info->id)
4192 #if MESH_DEBUG_CONNECTION
4193 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: (self)\n");
4197 #if MESH_DEBUG_CONNECTION
4200 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: %s\n", GNUNET_i2s (peer));
4203 path = path_new (2);
4204 path->peers[0] = myid;
4205 path->peers[1] = peer_info->id;
4206 GNUNET_PEER_change_rc (myid, 1);
4207 GNUNET_PEER_change_rc (peer_info->id, 1);
4208 peer_info_add_path (peer_info, path, GNUNET_YES);
4213 * Method called whenever a peer disconnects.
4215 * @param cls closure
4216 * @param peer peer identity this notification is about
4219 core_disconnect (void *cls, const struct GNUNET_PeerIdentity *peer)
4221 struct MeshPeerInfo *pi;
4224 #if MESH_DEBUG_CONNECTION
4225 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Peer disconnected\n");
4227 pi = GNUNET_CONTAINER_multihashmap_get (peers, &peer->hashPubKey);
4233 for (i = 0; i < CORE_QUEUE_SIZE; i++)
4235 /* TODO: notify that the transmission failed */
4236 peer_info_cancel_transmission (pi, i);
4238 peer_info_remove_path (pi, pi->id, myid);
4239 #if MESH_DEBUG_CONNECTION
4242 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: (self)\n");
4249 /******************************************************************************/
4250 /************************ MAIN FUNCTIONS ****************************/
4251 /******************************************************************************/
4254 * Iterator over tunnel hash map entries to destroy the tunnel during shutdown.
4256 * @param cls closure
4257 * @param key current key code
4258 * @param value value in the hash map
4259 * @return GNUNET_YES if we should continue to iterate,
4263 shutdown_tunnel (void *cls, const GNUNET_HashCode * key, void *value)
4265 struct MeshTunnel *t = value;
4272 * Iterator over peer hash map entries to destroy the tunnel during shutdown.
4274 * @param cls closure
4275 * @param key current key code
4276 * @param value value in the hash map
4277 * @return GNUNET_YES if we should continue to iterate,
4281 shutdown_peer (void *cls, const GNUNET_HashCode * key, void *value)
4283 struct MeshPeerInfo *p = value;
4285 peer_info_destroy (p);
4290 * Task run during shutdown.
4296 shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
4298 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: shutting down\n");
4299 /* TODO: destroy tunnels? */
4300 if (core_handle != NULL)
4302 GNUNET_CORE_disconnect (core_handle);
4305 GNUNET_CONTAINER_multihashmap_iterate (tunnels, &shutdown_tunnel, NULL);
4306 GNUNET_CONTAINER_multihashmap_iterate (peers, &shutdown_peer, NULL);
4307 if (dht_handle != NULL)
4309 GNUNET_DHT_disconnect (dht_handle);
4314 GNUNET_SERVER_notification_context_destroy (nc);
4317 if (GNUNET_SCHEDULER_NO_TASK != announce_id_task)
4319 GNUNET_SCHEDULER_cancel (announce_id_task);
4320 announce_id_task = GNUNET_SCHEDULER_NO_TASK;
4322 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: shut down\n");
4326 * Process mesh requests.
4328 * @param cls closure
4329 * @param server the initialized server
4330 * @param c configuration to use
4333 run (void *cls, struct GNUNET_SERVER_Handle *server,
4334 const struct GNUNET_CONFIGURATION_Handle *c)
4336 struct MeshPeerInfo *peer;
4337 struct MeshPeerPath *p;
4340 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: starting to run\n");
4341 server_handle = server;
4342 core_handle = GNUNET_CORE_connect (c, /* Main configuration */
4343 CORE_QUEUE_SIZE, /* queue size */
4344 NULL, /* Closure passed to MESH functions */
4345 &core_init, /* Call core_init once connected */
4346 &core_connect, /* Handle connects */
4347 &core_disconnect, /* remove peers on disconnects */
4348 NULL, /* Don't notify about all incoming messages */
4349 GNUNET_NO, /* For header only in notification */
4350 NULL, /* Don't notify about all outbound messages */
4351 GNUNET_NO, /* For header-only out notification */
4352 core_handlers); /* Register these handlers */
4354 if (core_handle == NULL)
4357 GNUNET_SCHEDULER_shutdown ();
4362 GNUNET_CONFIGURATION_get_value_filename (c, "GNUNETD", "HOSTKEY",
4365 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4367 ("Mesh service is lacking key configuration settings. Exiting.\n"));
4368 GNUNET_SCHEDULER_shutdown ();
4371 my_private_key = GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
4372 GNUNET_free (keyfile);
4373 if (my_private_key == NULL)
4375 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4376 _("Mesh service could not access hostkey. Exiting.\n"));
4377 GNUNET_SCHEDULER_shutdown ();
4380 GNUNET_CRYPTO_rsa_key_get_public (my_private_key, &my_public_key);
4381 GNUNET_CRYPTO_hash (&my_public_key, sizeof (my_public_key),
4382 &my_full_id.hashPubKey);
4383 myid = GNUNET_PEER_intern (&my_full_id);
4385 // // transport_handle = GNUNET_TRANSPORT_connect(c,
4392 dht_handle = GNUNET_DHT_connect (c, 64);
4393 if (dht_handle == NULL)
4399 next_local_tid = GNUNET_MESH_LOCAL_TUNNEL_ID_SERV;
4401 tunnels = GNUNET_CONTAINER_multihashmap_create (32);
4402 incoming_tunnels = GNUNET_CONTAINER_multihashmap_create (32);
4403 peers = GNUNET_CONTAINER_multihashmap_create (32);
4404 applications = GNUNET_CONTAINER_multihashmap_create (32);
4405 types = GNUNET_CONTAINER_multihashmap_create (32);
4407 GNUNET_SERVER_add_handlers (server_handle, client_handlers);
4408 nc = GNUNET_SERVER_notification_context_create (server_handle,
4410 GNUNET_SERVER_disconnect_notify (server_handle,
4411 &handle_local_client_disconnect, NULL);
4415 clients_tail = NULL;
4420 announce_applications_task = GNUNET_SCHEDULER_NO_TASK;
4421 announce_id_task = GNUNET_SCHEDULER_add_now (&announce_id, cls);
4423 /* Create a peer_info for the local peer */
4424 peer = peer_info_get (&my_full_id);
4427 GNUNET_PEER_change_rc (myid, 1);
4428 peer_info_add_path (peer, p, GNUNET_YES);
4430 /* Scheduled the task to clean up when shutdown is called */
4431 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &shutdown_task,
4434 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: end of run()\n");
4438 * The main function for the mesh service.
4440 * @param argc number of arguments from the command line
4441 * @param argv command line arguments
4442 * @return 0 ok, 1 on error
4445 main (int argc, char *const *argv)
4449 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: main()\n");
4452 GNUNET_SERVICE_run (argc, argv, "mesh", GNUNET_SERVICE_OPTION_NONE, &run,
4454 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: main() END\n");