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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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 * @param payload Pointer to the payload of the message.
773 * @return number of clients this message was sent to
776 send_subscribed_clients (const struct GNUNET_MessageHeader *msg,
777 const struct GNUNET_MessageHeader *payload)
779 struct GNUNET_PeerIdentity *oid;
780 struct MeshClient *c;
781 struct MeshTunnel *t;
782 MESH_TunnelNumber *tid;
785 char cbuf[htons (msg->size)];
787 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Sending to clients...\n");
788 type = ntohs (payload->type);
789 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: message of type %u\n", type);
791 memcpy (cbuf, msg, sizeof (cbuf));
792 switch (htons (msg->type))
794 struct GNUNET_MESH_Unicast *uc;
795 struct GNUNET_MESH_Multicast *mc;
796 struct GNUNET_MESH_ToOrigin *to;
798 case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
799 uc = (struct GNUNET_MESH_Unicast *) cbuf;
803 case GNUNET_MESSAGE_TYPE_MESH_MULTICAST:
804 mc = (struct GNUNET_MESH_Multicast *) cbuf;
808 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
809 to = (struct GNUNET_MESH_ToOrigin *) cbuf;
817 t = tunnel_get (oid, ntohl (*tid));
823 *tid = htonl (t->local_tid);
824 for (count = 0, c = clients; c != NULL; c = c->next)
827 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: client %u\n", c->id);
829 if (client_is_subscribed (type, c))
832 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: sending\n");
833 GNUNET_SERVER_notification_context_unicast (nc, c->handle,
834 (struct GNUNET_MessageHeader
835 *) cbuf, GNUNET_YES);
843 * Notify the client that owns the tunnel that a peer has connected to it
844 * (the requested path to it has been confirmed).
846 * @param t Tunnel whose owner to notify
847 * @param id Short id of the peer that has connected
850 send_client_peer_connected (const struct MeshTunnel *t, const GNUNET_PEER_Id id)
852 struct GNUNET_MESH_PeerControl pc;
854 pc.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD);
855 pc.header.size = htons (sizeof (struct GNUNET_MESH_PeerControl));
856 pc.tunnel_id = htonl (t->local_tid);
857 GNUNET_PEER_resolve (id, &pc.peer);
858 GNUNET_SERVER_notification_context_unicast (nc, t->client->handle, &pc.header,
864 * Notify all clients (not depending on registration status) that the incoming
865 * tunnel is no longer valid.
867 * @param t Tunnel that was destroyed.
870 send_clients_tunnel_destroy (struct MeshTunnel *t)
872 struct GNUNET_MESH_TunnelMessage msg;
874 msg.header.size = htons (sizeof (msg));
875 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY);
876 msg.tunnel_id = htonl (t->local_tid);
877 GNUNET_SERVER_notification_context_broadcast (nc, &msg.header, GNUNET_NO);
882 * Function called to notify a client about the socket
883 * being ready to queue more data. "buf" will be
884 * NULL and "size" zero if the socket was closed for
885 * writing in the meantime.
888 * @param size number of bytes available in buf
889 * @param buf where the callee should write the message
890 * @return number of bytes written to buf
893 send_core_create_path (void *cls, size_t size, void *buf);
897 * Function called to notify a client about the socket
898 * being ready to queue more data. "buf" will be
899 * NULL and "size" zero if the socket was closed for
900 * writing in the meantime.
902 * @param cls closure (data itself)
903 * @param size number of bytes available in buf
904 * @param buf where the callee should write the message
906 * @return number of bytes written to buf
909 send_core_data_multicast (void *cls, size_t size, void *buf);
913 * Decrements the reference counter and frees all resources if needed
915 * @param dd Data Descriptor used in a multicast message
918 data_descriptor_decrement_multicast (struct MeshDataDescriptor *dd)
920 if (0 == --(*(dd->copies)))
922 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Last copy!\n");
923 if (NULL != dd->client)
925 if (GNUNET_SCHEDULER_NO_TASK != *(dd->timeout_task))
927 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
928 "MESH: cancelling client timeout (%u)...\n",
929 *(dd->timeout_task));
930 GNUNET_SCHEDULER_cancel (*(dd->timeout_task));
931 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: notifying client...\n");
932 GNUNET_SERVER_receive_done (dd->client, GNUNET_OK);
934 GNUNET_free (dd->timeout_task);
936 GNUNET_free (dd->copies);
937 GNUNET_free (dd->data);
943 * Cancel a core transmission that was already requested and free all resources
944 * associated to the request.
946 * @param peer PeeInfo of the peer whose transmission is cancelled.
947 * @param i Position of the transmission to be cancelled.
950 peer_info_cancel_transmission (struct MeshPeerInfo *peer, unsigned int i)
952 if (NULL != peer->core_transmit[i])
954 struct MeshDataDescriptor *dd;
955 struct MeshPathInfo *path_info;
959 struct GNUNET_PeerIdentity id;
961 GNUNET_PEER_resolve (peer->id, &id);
962 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
963 "MESH: Cancelling data transmission at %s [%u]\n",
964 GNUNET_i2s (&id), i);
965 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: message type %u\n",
969 /* TODO: notify that tranmission has failed */
970 switch (peer->types[i])
972 case GNUNET_MESSAGE_TYPE_MESH_MULTICAST:
973 case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
974 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
975 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: type payload\n");
977 data_descriptor_decrement_multicast (dd);
979 case GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE:
980 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: type create path\n");
981 path_info = peer->infos[i];
982 path_destroy (path_info->path);
986 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: type unknown!\n");
988 GNUNET_CORE_notify_transmit_ready_cancel (peer->core_transmit[i]);
989 peer->core_transmit[i] = NULL;
990 GNUNET_free (peer->infos[i]);
996 * Get a unused CORE slot to transmit a message to a peer. If all the slots
997 * are used, cancel one and return it's position.
999 * @param peer PeerInfo of the neighbor we want to transmit to.
1001 * @return The index of an available slot to transmit to the neighbor.
1004 peer_info_transmit_slot (struct MeshPeerInfo *peer)
1008 for (i = 0; peer->core_transmit[i]; i++)
1010 if (i == (CORE_QUEUE_SIZE - 1))
1012 /* All positions are taken! Overwriting! */
1014 peer_info_cancel_transmission (peer, 0);
1023 * Retrieve the MeshPeerInfo stucture associated with the peer, create one
1024 * and insert it in the appropiate structures if the peer is not known yet.
1026 * @param peer Full identity of the peer.
1028 * @return Existing or newly created peer info.
1030 static struct MeshPeerInfo *
1031 peer_info_get (const struct GNUNET_PeerIdentity *peer)
1033 struct MeshPeerInfo *peer_info;
1035 peer_info = GNUNET_CONTAINER_multihashmap_get (peers, &peer->hashPubKey);
1036 if (NULL == peer_info)
1039 (struct MeshPeerInfo *) GNUNET_malloc (sizeof (struct MeshPeerInfo));
1040 GNUNET_CONTAINER_multihashmap_put (peers, &peer->hashPubKey, peer_info,
1041 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
1042 peer_info->id = GNUNET_PEER_intern (peer);
1050 * Retrieve the MeshPeerInfo stucture associated with the peer, create one
1051 * and insert it in the appropiate structures if the peer is not known yet.
1053 * @param peer Short identity of the peer.
1055 * @return Existing or newly created peer info.
1057 static struct MeshPeerInfo *
1058 peer_info_get_short (const GNUNET_PEER_Id peer)
1060 struct GNUNET_PeerIdentity id;
1062 GNUNET_PEER_resolve (peer, &id);
1063 return peer_info_get (&id);
1068 * Iterator to remove the tunnel from the list of tunnels a peer participates
1071 * @param cls Closure (tunnel info)
1072 * @param key GNUNET_PeerIdentity of the peer (unused)
1073 * @param value PeerInfo of the peer
1075 * @return always GNUNET_YES, to keep iterating
1078 peer_info_delete_tunnel (void *cls, const GNUNET_HashCode * key, void *value)
1080 struct MeshTunnel *t = cls;
1081 struct MeshPeerInfo *peer = value;
1084 for (i = 0; i < peer->ntunnels; i++)
1087 memcmp (&peer->tunnels[i]->id, &t->id, sizeof (struct MESH_TunnelID)))
1090 peer->tunnels[i] = peer->tunnels[peer->ntunnels];
1091 peer->tunnels = GNUNET_realloc (peer->tunnels, peer->ntunnels);
1100 * Core callback to write a
1102 * @param cls Closure (MeshDataDescriptor with data in "data" member).
1103 * @param size Number of bytes available in buf.
1104 * @param buf Where the to write the message.
1106 * @return number of bytes written to buf
1109 send_core_data_raw (void *cls, size_t size, void *buf)
1111 struct MeshDataDescriptor *info = cls;
1112 struct GNUNET_MessageHeader *msg;
1115 GNUNET_assert (NULL != info);
1116 GNUNET_assert (NULL != info->data);
1117 msg = (struct GNUNET_MessageHeader *) info->data;
1118 total_size = ntohs (msg->size);
1120 if (total_size > size)
1122 struct GNUNET_PeerIdentity id;
1124 GNUNET_PEER_resolve (info->peer->id, &id);
1125 info->peer->core_transmit[info->handler_n] =
1126 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 100,
1127 GNUNET_TIME_UNIT_FOREVER_REL, &id,
1128 size, &send_core_data_raw, info);
1131 info->peer->core_transmit[info->handler_n] = NULL;
1132 memcpy (buf, msg, total_size);
1133 GNUNET_free (info->data);
1140 * Sends an already built message to a peer, properly registrating
1141 * all used resources.
1143 * @param message Message to send. Fucntion makes a copy of it.
1144 * @param peer Short ID of the neighbor whom to send the message.
1147 send_message (const struct GNUNET_MessageHeader *message,
1148 const struct GNUNET_PeerIdentity *peer)
1150 struct MeshDataDescriptor *info;
1151 struct MeshPeerInfo *neighbor;
1152 struct MeshPeerPath *p;
1156 // GNUNET_TRANSPORT_try_connect();
1158 size = ntohs (message->size);
1159 info = GNUNET_malloc (sizeof (struct MeshDataDescriptor));
1160 info->data = GNUNET_malloc (size);
1161 memcpy (info->data, message, size);
1162 neighbor = peer_info_get (peer);
1163 for (p = neighbor->path_head; NULL != p; p = p->next)
1176 i = peer_info_transmit_slot (neighbor);
1177 info->handler_n = i;
1178 info->peer = neighbor;
1179 neighbor->types[i] = GNUNET_MESSAGE_TYPE_MESH_UNICAST;
1180 neighbor->infos[i] = info;
1181 neighbor->core_transmit[i] =
1182 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 100,
1183 GNUNET_TIME_UNIT_FOREVER_REL, peer,
1184 size, &send_core_data_raw, info);
1190 * Sends a CREATE PATH message for a path to a peer, properly registrating
1191 * all used resources.
1193 * @param peer PeerInfo of the final peer for whom this path is being created.
1194 * @param p Path itself.
1195 * @param t Tunnel for which the path is created.
1198 send_create_path (struct MeshPeerInfo *peer, struct MeshPeerPath *p,
1199 struct MeshTunnel *t)
1201 struct GNUNET_PeerIdentity id;
1202 struct MeshPathInfo *path_info;
1203 struct MeshPeerInfo *neighbor;
1208 p = tree_get_path_to_peer (t->tree, peer->id);
1215 for (i = 0; i < p->length; i++)
1217 if (p->peers[i] == myid)
1220 if (i >= p->length - 1)
1226 GNUNET_PEER_resolve (p->peers[i + 1], &id);
1228 path_info = GNUNET_malloc (sizeof (struct MeshPathInfo));
1229 path_info->path = p;
1231 neighbor = peer_info_get (&id);
1232 path_info->peer = neighbor;
1233 path_info->pos = peer_info_transmit_slot (neighbor);
1234 neighbor->types[path_info->pos] = GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE;
1235 neighbor->infos[path_info->pos] = path_info;
1236 neighbor->core_transmit[path_info->pos] = GNUNET_CORE_notify_transmit_ready (core_handle, /* handle */
1239 GNUNET_TIME_UNIT_FOREVER_REL, /* timeout */
1241 sizeof (struct GNUNET_MESH_ManipulatePath) + (p->length * sizeof (struct GNUNET_PeerIdentity)), /*size */
1242 &send_core_create_path, /* callback */
1243 path_info); /* cls */
1248 * Sends a DESTROY PATH message to free resources for a path in a tunnel
1250 * @param t Tunnel whose path to destroy.
1251 * @param destination Short ID of the peer to whom the path to destroy.
1254 send_destroy_path (struct MeshTunnel *t, GNUNET_PEER_Id destination)
1256 struct MeshPeerPath *p;
1259 p = tree_get_path_to_peer (t->tree, destination);
1265 size = sizeof (struct GNUNET_MESH_ManipulatePath);
1266 size += p->length * sizeof (struct GNUNET_PeerIdentity);
1268 struct GNUNET_MESH_ManipulatePath *msg;
1269 struct GNUNET_PeerIdentity *pi;
1273 msg = (struct GNUNET_MESH_ManipulatePath *) cbuf;
1274 msg->header.size = htons (size);
1275 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_DESTROY);
1276 msg->tid = htonl (t->id.tid);
1277 pi = (struct GNUNET_PeerIdentity *) &msg[1];
1278 for (i = 0; i < p->length; i++)
1280 GNUNET_PEER_resolve (p->peers[i], &pi[i]);
1282 send_message (&msg->header, tree_get_first_hop (t->tree, destination));
1289 * Try to establish a new connection to this peer.
1290 * Use the best path for the given tunnel.
1291 * If the peer doesn't have any path to it yet, try to get one.
1292 * If the peer already has some path, send a CREATE PATH towards it.
1294 * @param peer PeerInfo of the peer.
1295 * @param t Tunnel for which to create the path, if possible.
1298 peer_info_connect (struct MeshPeerInfo *peer, struct MeshTunnel *t)
1300 struct MeshPeerPath *p;
1301 struct MeshPathInfo *path_info;
1303 if (NULL != peer->path_head)
1305 p = tree_get_path_to_peer (t->tree, peer->id);
1314 send_create_path (peer, p, t);
1319 send_client_peer_connected (t, myid);
1322 else if (NULL == peer->dhtget)
1324 struct GNUNET_PeerIdentity id;
1326 GNUNET_PEER_resolve (peer->id, &id);
1327 path_info = GNUNET_malloc (sizeof (struct MeshPathInfo));
1328 path_info->peer = peer;
1330 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1331 "MESH: Starting DHT GET for peer %s\n", GNUNET_i2s (&id));
1332 peer->dhtgetcls = path_info;
1333 peer->dhtget = GNUNET_DHT_get_start (dht_handle, /* handle */
1334 GNUNET_TIME_UNIT_FOREVER_REL, /* timeout */
1335 GNUNET_BLOCK_TYPE_TEST, /* type */
1336 &id.hashPubKey, /* key to search */
1337 4, /* replication level */
1338 GNUNET_DHT_RO_RECORD_ROUTE | GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE, NULL, /* xquery */
1339 0, /* xquery bits */
1340 &dht_get_id_handler, path_info);
1342 /* Otherwise, there is no path but the DHT get is already started. */
1347 * Task to delay the connection of a peer
1349 * @param cls Closure (path info with tunnel and peer to connect).
1350 * Will be free'd on exection.
1351 * @param tc TaskContext
1354 peer_info_connect_task (void *cls,
1355 const struct GNUNET_SCHEDULER_TaskContext *tc)
1357 struct MeshPathInfo *path_info = cls;
1359 if (0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
1364 peer_info_connect (path_info->peer, path_info->t);
1370 * Destroy the peer_info and free any allocated resources linked to it
1372 * @param pi The peer_info to destroy.
1374 * @return GNUNET_OK on success
1377 peer_info_destroy (struct MeshPeerInfo *pi)
1379 struct GNUNET_PeerIdentity id;
1380 struct MeshPeerPath *p;
1381 struct MeshPeerPath *nextp;
1384 GNUNET_PEER_resolve (pi->id, &id);
1385 GNUNET_PEER_change_rc (pi->id, -1);
1388 GNUNET_CONTAINER_multihashmap_remove (peers, &id.hashPubKey, pi))
1391 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1392 "MESH: removing peer %s, not in hashmap\n", GNUNET_i2s (&id));
1394 if (NULL != pi->dhtget)
1396 GNUNET_DHT_get_stop (pi->dhtget);
1397 GNUNET_free (pi->dhtgetcls);
1399 for (i = 0; i < CORE_QUEUE_SIZE; i++)
1401 peer_info_cancel_transmission (pi, i);
1407 GNUNET_CONTAINER_DLL_remove (pi->path_head, pi->path_tail, p);
1417 * Remove all paths that rely on a direct connection between p1 and p2
1418 * from the peer itself and notify all tunnels about it.
1420 * @param peer PeerInfo of affected peer.
1421 * @param p1 GNUNET_PEER_Id of one peer.
1422 * @param p2 GNUNET_PEER_Id of another peer that was connected to the first and
1425 * TODO: optimize (see below)
1428 peer_info_remove_path (struct MeshPeerInfo *peer, GNUNET_PEER_Id p1,
1431 struct MeshPeerPath *p;
1432 struct MeshPeerPath *aux;
1433 struct MeshPeerInfo *peer_d;
1435 unsigned int destroyed;
1441 p = peer->path_head;
1445 for (i = 0; i < (p->length - 1); i++)
1447 if ((p->peers[i] == p1 && p->peers[i + 1] == p2) ||
1448 (p->peers[i] == p2 && p->peers[i + 1] == p1))
1450 GNUNET_CONTAINER_DLL_remove (peer->path_head, peer->path_tail, p);
1461 for (i = 0; i < peer->ntunnels; i++)
1463 d = tunnel_notify_connection_broken (peer->tunnels[i], p1, p2);
1464 if (0 == d) continue;
1466 * Problem: one or more peers have been deleted from the tunnel tree.
1467 * We don't know who they are to try to add them again.
1468 * We need to try to find a new path for each of the disconnected peers.
1469 * Some of them might already have a path to reach them that does not
1470 * involve p1 and p2. Adding all anew might render in a better tree than
1471 * the trivial immediate fix.
1473 * Trivial immiediate fix: try to reconnect to the disconnected node. All
1474 * its children will be reachable trough him.
1476 peer_d = peer_info_get_short (d);
1479 for (p = peer_d->path_head; NULL != p; p = p->next)
1481 if ((cost = tree_get_path_cost (peer->tunnels[i]->tree, p)) < best)
1489 /* No callback, as peer will be already disconnected and a connection
1490 * scheduled by tunnel_notify_connection_broken.
1492 tree_add_path (peer->tunnels[i]->tree, aux, NULL, NULL);
1496 peer_info_connect (peer_d, peer->tunnels[i]);
1503 * Add the path to the peer and update the path used to reach it in case this
1506 * @param peer_info Destination peer to add the path to.
1507 * @param path New path to add. Last peer must be the peer in arg 1.
1508 * Path will be either used of freed if already known.
1509 * @param trusted Do we trust that this path is real?
1512 peer_info_add_path (struct MeshPeerInfo *peer_info, struct MeshPeerPath *path,
1515 struct MeshPeerPath *aux;
1519 if ((NULL == peer_info) || (NULL == path))
1522 path_destroy (path);
1525 if (path->peers[path->length - 1] != peer_info->id)
1528 path_destroy (path);
1531 if (path->length <= 2 && GNUNET_NO == trusted)
1533 /* Only allow CORE to tell us about direct paths */
1534 path_destroy (path);
1537 GNUNET_assert (peer_info->id == path->peers[path->length - 1]);
1538 for (l = 1; l < path->length; l++)
1540 if (path->peers[l] == myid)
1542 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: shortening path by %u\n", l);
1543 for (l2 = 0; l2 < path->length - l; l2++)
1545 path->peers[l2] = path->peers[l + l2];
1550 GNUNET_realloc (path->peers, path->length * sizeof (GNUNET_PEER_Id));
1555 struct GNUNET_PeerIdentity id;
1557 GNUNET_PEER_resolve (peer_info->id, &id);
1558 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: adding path [%u] to peer %s\n",
1559 path->length, GNUNET_i2s (&id));
1562 l = path_get_length (path);
1569 GNUNET_assert (peer_info->id == path->peers[path->length - 1]);
1570 for (aux = peer_info->path_head; aux != NULL; aux = aux->next)
1572 l2 = path_get_length (aux);
1575 GNUNET_CONTAINER_DLL_insert_before (peer_info->path_head,
1576 peer_info->path_tail, aux, path);
1581 if (l2 == l && memcmp (path->peers, aux->peers, l) == 0)
1583 path_destroy (path);
1588 GNUNET_CONTAINER_DLL_insert_tail (peer_info->path_head, peer_info->path_tail,
1595 * Add the path to the origin peer and update the path used to reach it in case
1596 * this is the shortest.
1597 * The path is given in peer_info -> destination, therefore we turn the path
1598 * upside down first.
1600 * @param peer_info Peer to add the path to, being the origin of the path.
1601 * @param path New path to add after being inversed.
1602 * @param trusted Do we trust that this path is real?
1605 peer_info_add_path_to_origin (struct MeshPeerInfo *peer_info,
1606 struct MeshPeerPath *path, int trusted)
1609 peer_info_add_path (peer_info, path, trusted);
1614 * Build a PeerPath from the paths returned from the DHT, reversing the paths
1615 * to obtain a local peer -> destination path and interning the peer ids.
1617 * @return Newly allocated and created path
1619 static struct MeshPeerPath *
1620 path_build_from_dht (const struct GNUNET_PeerIdentity *get_path,
1621 unsigned int get_path_length,
1622 const struct GNUNET_PeerIdentity *put_path,
1623 unsigned int put_path_length)
1625 struct MeshPeerPath *p;
1631 GNUNET_PEER_change_rc (myid, 1);
1632 i = get_path_length;
1633 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: GET has %d hops.\n", i);
1634 for (i--; i >= 0; i--)
1636 id = GNUNET_PEER_intern (&get_path[i]);
1637 if (p->length > 0 && id == p->peers[p->length - 1])
1639 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Optimizing 1 hop out.\n");
1640 GNUNET_PEER_change_rc (id, -1);
1644 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Adding from GET: %s.\n",
1645 GNUNET_i2s (&get_path[i]));
1647 p->peers = GNUNET_realloc (p->peers, sizeof (GNUNET_PEER_Id) * p->length);
1648 p->peers[p->length - 1] = id;
1651 i = put_path_length;
1652 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: PUT has %d hops.\n", i);
1653 for (i--; i >= 0; i--)
1655 id = GNUNET_PEER_intern (&put_path[i]);
1658 /* PUT path went through us, so discard the path up until now and start
1659 * from here to get a much shorter (and loop-free) path.
1664 if (p->length > 0 && id == p->peers[p->length - 1])
1666 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Optimizing 1 hop out.\n");
1667 GNUNET_PEER_change_rc (id, -1);
1671 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Adding from PUT: %s.\n",
1672 GNUNET_i2s (&put_path[i]));
1674 p->peers = GNUNET_realloc (p->peers, sizeof (GNUNET_PEER_Id) * p->length);
1675 p->peers[p->length - 1] = id;
1679 if (get_path_length > 0)
1680 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: (first of GET: %s)\n",
1681 GNUNET_i2s (&get_path[0]));
1682 if (put_path_length > 0)
1683 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: (first of PUT: %s)\n",
1684 GNUNET_i2s (&put_path[0]));
1685 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: In total: %d hops\n",
1687 for (i = 0; i < p->length; i++)
1689 struct GNUNET_PeerIdentity peer_id;
1691 GNUNET_PEER_resolve (p->peers[i], &peer_id);
1692 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: %u: %s\n", p->peers[i],
1693 GNUNET_i2s (&peer_id));
1701 * Adds a path to the peer_infos of all the peers in the path
1703 * @param p Path to process.
1704 * @param confirmed Whether we know if the path works or not. FIXME use
1707 path_add_to_peers (struct MeshPeerPath *p, int confirmed)
1711 /* TODO: invert and add */
1712 for (i = 1; i < p->length && p->peers[i] != myid; i++) /* skip'em */;
1713 for (i++; i < p->length; i++)
1715 struct MeshPeerInfo *aux;
1716 struct MeshPeerPath *copy;
1718 aux = peer_info_get_short(p->peers[i]);
1719 copy = path_duplicate(p);
1721 peer_info_add_path(aux, copy, GNUNET_NO);
1727 * Send keepalive packets for a peer
1729 * @param cls Closure (tunnel for which to send the keepalive).
1730 * @param tc Notification context.
1732 * TODO: implement explicit multicast keepalive?
1735 path_refresh (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
1739 * Search for a tunnel among the incoming tunnels
1741 * @param tid the local id of the tunnel
1743 * @return tunnel handler, NULL if doesn't exist
1745 static struct MeshTunnel *
1746 tunnel_get_incoming (MESH_TunnelNumber tid)
1748 GNUNET_HashCode hash;
1750 GNUNET_assert (tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV);
1751 GNUNET_CRYPTO_hash (&tid, sizeof (MESH_TunnelNumber), &hash);
1752 return GNUNET_CONTAINER_multihashmap_get (incoming_tunnels, &hash);
1757 * Search for a tunnel among the tunnels for a client
1759 * @param c the client whose tunnels to search in
1760 * @param tid the local id of the tunnel
1762 * @return tunnel handler, NULL if doesn't exist
1764 static struct MeshTunnel *
1765 tunnel_get_by_local_id (struct MeshClient *c, MESH_TunnelNumber tid)
1767 if (tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
1769 return tunnel_get_incoming (tid);
1773 GNUNET_HashCode hash;
1775 GNUNET_CRYPTO_hash (&tid, sizeof (MESH_TunnelNumber), &hash);
1776 return GNUNET_CONTAINER_multihashmap_get (c->tunnels, &hash);
1782 * Search for a tunnel by global ID using PEER_ID
1784 * @param pi owner of the tunnel
1785 * @param tid global tunnel number
1787 * @return tunnel handler, NULL if doesn't exist
1789 static struct MeshTunnel *
1790 tunnel_get_by_pi (GNUNET_PEER_Id pi, MESH_TunnelNumber tid)
1792 struct MESH_TunnelID id;
1793 GNUNET_HashCode hash;
1798 GNUNET_CRYPTO_hash (&id, sizeof (struct MESH_TunnelID), &hash);
1799 return GNUNET_CONTAINER_multihashmap_get (tunnels, &hash);
1804 * Search for a tunnel by global ID using full PeerIdentities
1806 * @param oid owner of the tunnel
1807 * @param tid global tunnel number
1809 * @return tunnel handler, NULL if doesn't exist
1811 static struct MeshTunnel *
1812 tunnel_get (struct GNUNET_PeerIdentity *oid, MESH_TunnelNumber tid)
1814 return tunnel_get_by_pi (GNUNET_PEER_search (oid), tid);
1819 * Callback used to notify a client owner of a tunnel that a peer has
1820 * disconnected, most likely because of a path change.
1822 * @param cls Closure (tunnel this notification is about).
1823 * @param peer_id Short ID of disconnected peer.
1826 notify_peer_disconnected (void *cls, GNUNET_PEER_Id peer_id)
1828 struct MeshTunnel *t = cls;
1829 struct MeshPeerInfo *peer;
1830 struct MeshPathInfo *path_info;
1832 if (NULL != t->client && NULL != nc)
1834 struct GNUNET_MESH_PeerControl msg;
1836 msg.header.size = htons (sizeof (msg));
1837 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_DEL);
1838 msg.tunnel_id = htonl (t->local_tid);
1839 GNUNET_PEER_resolve (peer_id, &msg.peer);
1840 GNUNET_SERVER_notification_context_unicast (nc, t->client->handle,
1841 &msg.header, GNUNET_NO);
1843 peer = peer_info_get_short (peer_id);
1844 path_info = GNUNET_malloc (sizeof (struct MeshPathInfo));
1845 path_info->peer = peer;
1847 GNUNET_SCHEDULER_add_now (&peer_info_connect_task, path_info);
1852 * Add a peer to a tunnel, accomodating paths accordingly and initializing all
1853 * needed rescources.
1854 * If peer already exists, reevaluate shortest path and change if different.
1856 * @param t Tunnel we want to add a new peer to
1857 * @param peer PeerInfo of the peer being added
1861 tunnel_add_peer (struct MeshTunnel *t, struct MeshPeerInfo *peer)
1863 struct GNUNET_PeerIdentity id;
1864 struct MeshPeerPath *best_p;
1865 struct MeshPeerPath *p;
1866 unsigned int best_cost;
1869 GNUNET_PEER_resolve (peer->id, &id);
1871 GNUNET_CONTAINER_multihashmap_contains (t->peers, &id.hashPubKey))
1874 GNUNET_array_append (peer->tunnels, peer->ntunnels, t);
1875 GNUNET_assert (GNUNET_OK ==
1876 GNUNET_CONTAINER_multihashmap_put (t->peers, &id.hashPubKey,
1878 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST));
1881 if (NULL != (p = peer->path_head))
1884 best_cost = tree_get_path_cost (t->tree, p);
1887 if ((cost = tree_get_path_cost (t->tree, p)) < best_cost)
1894 tree_add_path (t->tree, best_p, ¬ify_peer_disconnected, t);
1895 if (GNUNET_SCHEDULER_NO_TASK == t->path_refresh_task)
1896 t->path_refresh_task =
1897 GNUNET_SCHEDULER_add_delayed (REFRESH_PATH_TIME, &path_refresh, t);
1901 /* Start a DHT get */
1902 peer_info_connect (peer, t);
1907 * Add a path to a tunnel which we don't own, just to remember the next hop.
1908 * If destination node was already in the tunnel, the first hop information
1909 * will be replaced with the new path.
1911 * @param t Tunnel we want to add a new peer to
1912 * @param p Path to add
1913 * @param own_pos Position of local node in path.
1917 tunnel_add_path (struct MeshTunnel *t, struct MeshPeerPath *p,
1918 unsigned int own_pos)
1920 struct GNUNET_PeerIdentity id;
1922 GNUNET_assert (0 != own_pos);
1923 tree_add_path (t->tree, p, NULL, NULL);
1924 if (own_pos < p->length - 1)
1926 GNUNET_PEER_resolve (p->peers[own_pos + 1], &id);
1927 tree_update_first_hops (t->tree, myid, &id);
1933 * Notifies a tunnel that a connection has broken that affects at least
1934 * some of its peers. Sends a notification towards the root of the tree.
1935 * In case the peer is the owner of the tree, notifies the client that owns
1936 * the tunnel and tries to reconnect.
1938 * @param t Tunnel affected.
1939 * @param p1 Peer that got disconnected from p2.
1940 * @param p2 Peer that got disconnected from p1.
1942 * @return Short ID of the peer disconnected (either p1 or p2).
1943 * 0 if the tunnel remained unaffected.
1945 static GNUNET_PEER_Id
1946 tunnel_notify_connection_broken (struct MeshTunnel *t, GNUNET_PEER_Id p1,
1952 tree_notify_connection_broken (t->tree, p1, p2, ¬ify_peer_disconnected,
1954 if (myid != p1 && myid != p2)
1960 if (tree_get_predecessor (t->tree) != 0)
1962 /* We are the peer still connected, notify owner of the disconnection. */
1963 struct GNUNET_MESH_PathBroken msg;
1964 struct GNUNET_PeerIdentity neighbor;
1966 msg.header.size = htons (sizeof (msg));
1967 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_BROKEN);
1968 GNUNET_PEER_resolve (t->id.oid, &msg.oid);
1969 msg.tid = htonl (t->id.tid);
1970 msg.peer1 = my_full_id;
1971 GNUNET_PEER_resolve (pid, &msg.peer2);
1972 GNUNET_PEER_resolve (tree_get_predecessor (t->tree), &neighbor);
1973 send_message (&msg.header, &neighbor);
1980 struct MeshMulticastData
1982 struct MeshTunnel *t;
1984 GNUNET_SCHEDULER_TaskIdentifier *task;
1986 unsigned int *reference_counter;
1995 * Send a multicast packet to a neighbor.
1998 tunnel_send_multicast_iterator (void *cls, GNUNET_PEER_Id neighbor_id)
2000 struct MeshMulticastData *mdata = cls;
2001 struct MeshDataDescriptor *info;
2002 struct GNUNET_PeerIdentity neighbor;
2005 info = GNUNET_malloc (sizeof (struct MeshDataDescriptor));
2007 info->data = mdata->data;
2008 info->size = mdata->data_len;
2009 info->copies = mdata->reference_counter;
2010 (*(mdata->reference_counter))++;
2012 if (NULL != mdata->t->client)
2014 info->client = mdata->t->client->handle;
2015 info->timeout_task = mdata->task;
2017 info->destination = neighbor_id;
2018 GNUNET_PEER_resolve (neighbor_id, &neighbor);
2020 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: sending to %s...\n",
2021 GNUNET_i2s (&neighbor));
2023 info->peer = peer_info_get (&neighbor);
2024 GNUNET_assert (NULL != info->peer);
2025 i = peer_info_transmit_slot (info->peer);
2026 info->handler_n = i;
2027 info->peer->infos[i] = info;
2028 info->peer->types[i] = GNUNET_MESSAGE_TYPE_MESH_MULTICAST;
2029 info->peer->core_transmit[i] =
2030 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0,
2031 GNUNET_TIME_UNIT_FOREVER_REL,
2032 &neighbor, info->size,
2033 &send_core_data_multicast, info);
2037 * Send a message in a tunnel in multicast, sending a copy to each child node
2038 * down the local one in the tunnel tree.
2040 * @param t Tunnel in which to send the data.
2041 * @param msg Message to be sent
2044 tunnel_send_multicast (struct MeshTunnel *t,
2045 const struct GNUNET_MessageHeader *msg)
2047 struct MeshMulticastData *mdata;
2050 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2051 "MESH: sending a multicast packet...\n");
2053 mdata = GNUNET_malloc (sizeof (struct MeshMulticastData));
2054 mdata->data_len = ntohs (msg->size);
2055 mdata->reference_counter = GNUNET_malloc (sizeof (unsigned int));
2057 mdata->data = GNUNET_malloc (mdata->data_len);
2058 memcpy (mdata->data, msg, mdata->data_len);
2059 if (ntohs (msg->type) == GNUNET_MESSAGE_TYPE_MESH_MULTICAST)
2061 struct GNUNET_MESH_Multicast *mcast;
2063 mcast = (struct GNUNET_MESH_Multicast *) mdata->data;
2064 mcast->ttl = htonl (ntohl (mcast->ttl) - 1);
2066 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2067 "MESH: data packet, ttl: %u\n",
2068 ntohl (mcast->ttl));
2072 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2073 "MESH: not a data packet, no ttl\n");
2076 if (NULL != t->client)
2078 mdata->task = GNUNET_malloc (sizeof (GNUNET_SCHEDULER_TaskIdentifier));
2080 GNUNET_SCHEDULER_add_delayed (UNACKNOWLEDGED_WAIT, &client_allow_send,
2084 tree_iterate_children (t->tree, &tunnel_send_multicast_iterator, mdata);
2085 if (*(mdata->reference_counter) == 0)
2087 GNUNET_free (mdata->data);
2088 GNUNET_free (mdata->reference_counter);
2089 if (NULL != mdata->task)
2091 GNUNET_free (mdata->task);
2094 GNUNET_free (mdata);
2096 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2097 "MESH: sending a multicast packet done\n");
2104 * Send a message to all peers in this tunnel that the tunnel is no longer
2107 * @param t The tunnel whose peers to notify.
2110 tunnel_send_destroy (struct MeshTunnel *t)
2112 struct GNUNET_MESH_TunnelDestroy msg;
2114 msg.header.size = htons (sizeof (msg));
2115 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY);
2116 GNUNET_PEER_resolve (t->id.oid, &msg.oid);
2117 msg.tid = htonl (t->id.tid);
2118 tunnel_send_multicast (t, &msg.header);
2124 * Destroy the tunnel and free any allocated resources linked to it
2126 * @param t the tunnel to destroy
2128 * @return GNUNET_OK on success
2131 tunnel_destroy (struct MeshTunnel *t)
2133 struct MeshClient *c;
2134 struct MeshQueue *q;
2135 struct MeshQueue *qn;
2136 GNUNET_HashCode hash;
2145 struct GNUNET_PeerIdentity id;
2147 GNUNET_PEER_resolve (t->id.oid, &id);
2148 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: destroying tunnel %s [%x]\n",
2149 GNUNET_i2s (&id), t->id.tid);
2151 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: by client %u\n", c->id);
2155 GNUNET_CRYPTO_hash (&t->id, sizeof (struct MESH_TunnelID), &hash);
2156 if (GNUNET_YES != GNUNET_CONTAINER_multihashmap_remove (tunnels, &hash, t))
2161 GNUNET_CRYPTO_hash (&t->local_tid, sizeof (MESH_TunnelNumber), &hash);
2163 GNUNET_YES != GNUNET_CONTAINER_multihashmap_remove (c->tunnels, &hash, t))
2167 if (t->local_tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
2169 GNUNET_CRYPTO_hash (&t->local_tid, sizeof (MESH_TunnelNumber), &hash);
2170 GNUNET_break (GNUNET_YES ==
2171 GNUNET_CONTAINER_multihashmap_remove (incoming_tunnels, &hash,
2174 if (NULL != t->peers)
2176 GNUNET_CONTAINER_multihashmap_iterate (t->peers, &peer_info_delete_tunnel,
2178 GNUNET_CONTAINER_multihashmap_destroy (t->peers);
2183 if (NULL != q->data)
2184 GNUNET_free (q->data);
2188 /* TODO cancel core transmit ready in case it was active */
2190 tree_destroy (t->tree);
2191 if (NULL != t->dht_get_type)
2192 GNUNET_DHT_get_stop (t->dht_get_type);
2193 if (GNUNET_SCHEDULER_NO_TASK != t->timeout_task)
2194 GNUNET_SCHEDULER_cancel (t->timeout_task);
2195 if (GNUNET_SCHEDULER_NO_TASK != t->path_refresh_task)
2196 GNUNET_SCHEDULER_cancel (t->path_refresh_task);
2203 * Removes an explicit path from a tunnel, freeing all intermediate nodes
2204 * that are no longer needed, as well as nodes of no longer reachable peers.
2205 * The tunnel itself is also destoyed if results in a remote empty tunnel.
2207 * @param t Tunnel from which to remove the path.
2208 * @param peer Short id of the peer which should be removed.
2211 tunnel_delete_peer (struct MeshTunnel *t, GNUNET_PEER_Id peer)
2213 if (GNUNET_NO == tree_del_peer (t->tree, peer, NULL, NULL))
2219 * tunnel_destroy_iterator: iterator for deleting each tunnel that belongs to a
2220 * client when the client disconnects.
2222 * @param cls closure (client that is disconnecting)
2223 * @param key the hash of the local tunnel id (used to access the hashmap)
2224 * @param value the value stored at the key (tunnel to destroy)
2226 * @return GNUNET_OK on success
2229 tunnel_destroy_iterator (void *cls, const GNUNET_HashCode * key, void *value)
2231 struct MeshTunnel *t = value;
2234 r = tunnel_destroy (t);
2240 * Timeout function, destroys tunnel if called
2242 * @param cls Closure (tunnel to destroy).
2243 * @param tc TaskContext
2246 tunnel_timeout (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
2248 struct MeshTunnel *t = cls;
2250 if (GNUNET_SCHEDULER_REASON_SHUTDOWN == tc->reason)
2252 t->timeout_task = GNUNET_SCHEDULER_NO_TASK;
2257 * Resets the tunnel timeout. Starts it if no timeout was running.
2259 * @param t Tunnel whose timeout to reset.
2262 tunnel_reset_timeout (struct MeshTunnel *t)
2264 if (GNUNET_SCHEDULER_NO_TASK != t->timeout_task)
2265 GNUNET_SCHEDULER_cancel (t->timeout_task);
2267 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_multiply
2268 (REFRESH_PATH_TIME, 4), &tunnel_timeout, t);
2272 /******************************************************************************/
2273 /**************** MESH NETWORK HANDLER HELPERS ***********************/
2274 /******************************************************************************/
2277 * Function called to notify a client about the socket
2278 * being ready to queue more data. "buf" will be
2279 * NULL and "size" zero if the socket was closed for
2280 * writing in the meantime.
2282 * @param cls closure
2283 * @param size number of bytes available in buf
2284 * @param buf where the callee should write the message
2285 * @return number of bytes written to buf
2288 send_core_create_path (void *cls, size_t size, void *buf)
2290 struct MeshPathInfo *info = cls;
2291 struct GNUNET_MESH_ManipulatePath *msg;
2292 struct GNUNET_PeerIdentity *peer_ptr;
2293 struct MeshPeerInfo *peer = info->peer;
2294 struct MeshTunnel *t = info->t;
2295 struct MeshPeerPath *p = info->path;
2299 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: CREATE PATH sending...\n");
2301 sizeof (struct GNUNET_MESH_ManipulatePath) +
2302 p->length * sizeof (struct GNUNET_PeerIdentity);
2304 if (size < size_needed || NULL == buf)
2306 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: create path retransmit!\n");
2307 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: buf: %p\n", buf);
2308 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: size: (%u/%u)\n", size,
2310 info->peer->core_transmit[info->pos] =
2311 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0,
2312 GNUNET_TIME_UNIT_FOREVER_REL,
2313 tree_get_first_hop (t->tree,
2315 size_needed, &send_core_create_path,
2319 info->peer->core_transmit[info->pos] = NULL;
2322 struct GNUNET_PeerIdentity id;
2324 GNUNET_PEER_resolve (peer->id, &id);
2325 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2326 "MESH: setting core_transmit %s [%u] to NULL\n",
2327 GNUNET_i2s (&id), info->pos);
2330 msg = (struct GNUNET_MESH_ManipulatePath *) buf;
2331 msg->header.size = htons (size_needed);
2332 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE);
2333 msg->tid = ntohl (t->id.tid);
2335 peer_ptr = (struct GNUNET_PeerIdentity *) &msg[1];
2336 for (i = 0; i < p->length; i++)
2338 GNUNET_PEER_resolve (p->peers[i], peer_ptr++);
2344 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2345 "MESH: CREATE PATH (%u bytes long) sent!\n", size_needed);
2351 * Function called to notify a client about the socket
2352 * being ready to queue more data. "buf" will be
2353 * NULL and "size" zero if the socket was closed for
2354 * writing in the meantime.
2356 * @param cls closure (data itself)
2357 * @param size number of bytes available in buf
2358 * @param buf where the callee should write the message
2360 * @return number of bytes written to buf
2363 send_core_data_multicast (void *cls, size_t size, void *buf)
2365 struct MeshDataDescriptor *info = cls;
2368 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Multicast callback.\n");
2369 GNUNET_assert (NULL != info);
2370 GNUNET_assert (NULL != info->peer);
2371 total_size = info->size;
2372 GNUNET_assert (total_size < GNUNET_SERVER_MAX_MESSAGE_SIZE);
2374 if (total_size > size)
2377 struct GNUNET_PeerIdentity id;
2379 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2380 "MESH: Multicast: retransmitting... (%u/%u)\n", size,
2382 GNUNET_PEER_resolve (info->peer->id, &id);
2383 info->peer->core_transmit[info->handler_n] =
2384 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0,
2385 GNUNET_TIME_UNIT_FOREVER_REL, &id,
2387 &send_core_data_multicast, info);
2390 info->peer->core_transmit[info->handler_n] = NULL;
2391 info->peer->infos[info->handler_n] = NULL;
2392 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: copying data...\n");
2393 memcpy (buf, info->data, total_size);
2396 struct GNUNET_MESH_Multicast *mc;
2397 struct GNUNET_MessageHeader *mh;
2400 if (ntohs (mh->type) == GNUNET_MESSAGE_TYPE_MESH_MULTICAST)
2402 mc = (struct GNUNET_MESH_Multicast *) mh;
2403 mh = (struct GNUNET_MessageHeader *) &mc[1];
2404 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2405 "MESH: multicast, payload type %u\n", ntohs (mh->type));
2406 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2407 "MESH: multicast, payload size %u\n", ntohs (mh->size));
2411 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: type %u\n",
2416 data_descriptor_decrement_multicast (info);
2417 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: freeing info...\n");
2419 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: return %u\n", total_size);
2425 * Function called to notify a client about the socket
2426 * being ready to queue more data. "buf" will be
2427 * NULL and "size" zero if the socket was closed for
2428 * writing in the meantime.
2430 * @param cls closure (MeshDataDescriptor)
2431 * @param size number of bytes available in buf
2432 * @param buf where the callee should write the message
2433 * @return number of bytes written to buf
2436 send_core_path_ack (void *cls, size_t size, void *buf)
2438 struct MeshDataDescriptor *info = cls;
2439 struct GNUNET_MESH_PathACK *msg = buf;
2441 GNUNET_assert (NULL != info);
2444 info->peer->core_transmit[info->handler_n] = NULL;
2446 if (sizeof (struct GNUNET_MESH_PathACK) > size)
2451 msg->header.size = htons (sizeof (struct GNUNET_MESH_PathACK));
2452 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_ACK);
2453 GNUNET_PEER_resolve (info->origin->oid, &msg->oid);
2454 msg->tid = htonl (info->origin->tid);
2455 msg->peer_id = my_full_id;
2457 /* TODO add signature */
2459 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: PATH ACK sent!\n");
2460 return sizeof (struct GNUNET_MESH_PathACK);
2464 /******************************************************************************/
2465 /******************** MESH NETWORK HANDLERS **************************/
2466 /******************************************************************************/
2470 * Core handler for path creation
2472 * @param cls closure
2473 * @param message message
2474 * @param peer peer identity this notification is about
2475 * @param atsi performance data
2476 * @param atsi_count number of records in 'atsi'
2478 * @return GNUNET_OK to keep the connection open,
2479 * GNUNET_SYSERR to close it (signal serious error)
2482 handle_mesh_path_create (void *cls, const struct GNUNET_PeerIdentity *peer,
2483 const struct GNUNET_MessageHeader *message,
2484 const struct GNUNET_ATS_Information *atsi,
2485 unsigned int atsi_count)
2487 unsigned int own_pos;
2490 MESH_TunnelNumber tid;
2491 struct GNUNET_MESH_ManipulatePath *msg;
2492 struct GNUNET_PeerIdentity *pi;
2493 GNUNET_HashCode hash;
2494 struct MeshPeerPath *path;
2495 struct MeshPeerInfo *dest_peer_info;
2496 struct MeshPeerInfo *orig_peer_info;
2497 struct MeshTunnel *t;
2499 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2500 "MESH: Received a path create msg [%s]\n",
2501 GNUNET_i2s (&my_full_id));
2502 size = ntohs (message->size);
2503 if (size < sizeof (struct GNUNET_MESH_ManipulatePath))
2505 GNUNET_break_op (0);
2509 size -= sizeof (struct GNUNET_MESH_ManipulatePath);
2510 if (size % sizeof (struct GNUNET_PeerIdentity))
2512 GNUNET_break_op (0);
2515 size /= sizeof (struct GNUNET_PeerIdentity);
2518 GNUNET_break_op (0);
2521 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: path has %u hops.\n", size);
2522 msg = (struct GNUNET_MESH_ManipulatePath *) message;
2524 tid = ntohl (msg->tid);
2525 pi = (struct GNUNET_PeerIdentity *) &msg[1];
2526 t = tunnel_get (pi, tid);
2527 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2528 "MESH: path is for tunnel %s [%X].\n", GNUNET_i2s (pi), tid);
2531 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Creating tunnel\n");
2532 t = GNUNET_malloc (sizeof (struct MeshTunnel));
2533 t->id.oid = GNUNET_PEER_intern (pi);
2535 while (NULL != tunnel_get_incoming (next_local_tid))
2536 next_local_tid = (next_local_tid + 1) | GNUNET_MESH_LOCAL_TUNNEL_ID_SERV;
2537 t->local_tid = next_local_tid++;
2538 next_local_tid = next_local_tid | GNUNET_MESH_LOCAL_TUNNEL_ID_SERV;
2539 t->tree = tree_new (t->id.oid);
2541 GNUNET_CRYPTO_hash (&t->id, sizeof (struct MESH_TunnelID), &hash);
2543 GNUNET_CONTAINER_multihashmap_put (tunnels, &hash, t,
2544 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST))
2550 tunnel_reset_timeout (t);
2551 GNUNET_CRYPTO_hash (&t->local_tid, sizeof (MESH_TunnelNumber), &hash);
2553 GNUNET_CONTAINER_multihashmap_put (incoming_tunnels, &hash, t,
2554 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST))
2562 GNUNET_CONTAINER_multihashmap_get (peers, &pi[size - 1].hashPubKey);
2563 if (NULL == dest_peer_info)
2565 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2566 "MESH: Creating PeerInfo for destination.\n");
2567 dest_peer_info = GNUNET_malloc (sizeof (struct MeshPeerInfo));
2568 dest_peer_info->id = GNUNET_PEER_intern (&pi[size - 1]);
2569 GNUNET_CONTAINER_multihashmap_put (peers, &pi[size - 1].hashPubKey,
2571 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
2573 orig_peer_info = GNUNET_CONTAINER_multihashmap_get (peers, &pi->hashPubKey);
2574 if (NULL == orig_peer_info)
2576 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2577 "MESH: Creating PeerInfo for origin.\n");
2578 orig_peer_info = GNUNET_malloc (sizeof (struct MeshPeerInfo));
2579 orig_peer_info->id = GNUNET_PEER_intern (pi);
2580 GNUNET_CONTAINER_multihashmap_put (peers, &pi->hashPubKey, orig_peer_info,
2581 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
2583 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Creating path...\n");
2584 path = path_new (size);
2586 for (i = 0; i < size; i++)
2588 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: ... adding %s\n",
2589 GNUNET_i2s (&pi[i]));
2590 path->peers[i] = GNUNET_PEER_intern (&pi[i]);
2591 if (path->peers[i] == myid)
2594 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Own position: %u\n", own_pos);
2597 /* cannot be self, must be 'not found' */
2598 /* create path: self not found in path through self */
2599 GNUNET_break_op (0);
2600 path_destroy (path);
2601 /* FIXME error. destroy tunnel? leave for timeout? */
2604 path_add_to_peers(path, GNUNET_NO);
2605 tunnel_add_path (t, path, own_pos);
2606 if (own_pos == size - 1)
2608 /* It is for us! Send ack. */
2609 struct MeshDataDescriptor *info;
2612 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: It's for us!\n");
2613 peer_info_add_path_to_origin (orig_peer_info, path, GNUNET_NO);
2614 if (NULL == t->peers)
2616 /* New tunnel! Notify clients! */
2617 struct GNUNET_MESH_TunnelNotification cmsg;
2619 cmsg.header.size = htons (sizeof (cmsg));
2620 cmsg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE);
2621 GNUNET_PEER_resolve (t->id.oid, &cmsg.peer);
2622 cmsg.tunnel_id = htonl (t->local_tid);
2623 GNUNET_SERVER_notification_context_broadcast (nc, &cmsg.header,
2626 t->peers = GNUNET_CONTAINER_multihashmap_create (4);
2628 GNUNET_break (GNUNET_OK ==
2629 GNUNET_CONTAINER_multihashmap_put (t->peers,
2630 &my_full_id.hashPubKey,
2633 GNUNET_CONTAINER_MULTIHASHMAPOPTION_REPLACE));
2634 /* FIXME use send_message */
2635 info = GNUNET_malloc (sizeof (struct MeshDataDescriptor));
2636 info->origin = &t->id;
2637 info->peer = GNUNET_CONTAINER_multihashmap_get (peers, &peer->hashPubKey);
2638 GNUNET_assert (NULL != info->peer);
2639 j = peer_info_transmit_slot (info->peer);
2640 info->handler_n = j;
2641 info->peer->types[j] = GNUNET_MESSAGE_TYPE_MESH_PATH_ACK;
2642 info->peer->infos[j] = info;
2643 info->peer->core_transmit[j] =
2644 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 100,
2645 GNUNET_TIME_UNIT_FOREVER_REL, peer,
2646 sizeof (struct GNUNET_MESH_PathACK),
2647 &send_core_path_ack, info);
2651 struct MeshPeerPath *path2;
2653 /* It's for somebody else! Retransmit. */
2654 path2 = path_duplicate (path);
2655 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Retransmitting.\n");
2656 peer_info_add_path (dest_peer_info, path2, GNUNET_NO);
2657 path2 = path_duplicate (path);
2658 peer_info_add_path_to_origin (orig_peer_info, path2, GNUNET_NO);
2659 send_create_path (dest_peer_info, path, t);
2666 * Core handler for path destruction
2668 * @param cls closure
2669 * @param message message
2670 * @param peer peer identity this notification is about
2671 * @param atsi performance data
2672 * @param atsi_count number of records in 'atsi'
2674 * @return GNUNET_OK to keep the connection open,
2675 * GNUNET_SYSERR to close it (signal serious error)
2678 handle_mesh_path_destroy (void *cls, const struct GNUNET_PeerIdentity *peer,
2679 const struct GNUNET_MessageHeader *message,
2680 const struct GNUNET_ATS_Information *atsi,
2681 unsigned int atsi_count)
2683 struct GNUNET_MESH_ManipulatePath *msg;
2684 struct GNUNET_PeerIdentity *pi;
2685 struct MeshPeerPath *path;
2686 struct MeshTunnel *t;
2687 unsigned int own_pos;
2691 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2692 "MESH: Received a PATH DESTROY msg from %s\n", GNUNET_i2s (peer));
2693 size = ntohs (message->size);
2694 if (size < sizeof (struct GNUNET_MESH_ManipulatePath))
2696 GNUNET_break_op (0);
2700 size -= sizeof (struct GNUNET_MESH_ManipulatePath);
2701 if (size % sizeof (struct GNUNET_PeerIdentity))
2703 GNUNET_break_op (0);
2706 size /= sizeof (struct GNUNET_PeerIdentity);
2709 GNUNET_break_op (0);
2712 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: path has %u hops.\n", size);
2714 msg = (struct GNUNET_MESH_ManipulatePath *) message;
2715 pi = (struct GNUNET_PeerIdentity *) &msg[1];
2716 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2717 "MESH: path is for tunnel %s [%X].\n", GNUNET_i2s (pi),
2719 t = tunnel_get (pi, ntohl (msg->tid));
2722 /* TODO notify back: we don't know this tunnel */
2723 GNUNET_break_op (0);
2726 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Creating path...\n");
2727 path = path_new (size);
2729 for (i = 0; i < size; i++)
2731 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: ... adding %s\n",
2732 GNUNET_i2s (&pi[i]));
2733 path->peers[i] = GNUNET_PEER_intern (&pi[i]);
2734 if (path->peers[i] == myid)
2737 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Own position: %u\n", own_pos);
2738 if (own_pos < path->length - 1)
2739 send_message (message, &pi[own_pos + 1]);
2740 tunnel_delete_peer (t, path->peers[path->length - 1]);
2741 path_destroy (path);
2747 * Core handler for notifications of broken paths
2749 * @param cls closure
2750 * @param message message
2751 * @param peer peer identity this notification is about
2752 * @param atsi performance data
2753 * @param atsi_count number of records in 'atsi'
2755 * @return GNUNET_OK to keep the connection open,
2756 * GNUNET_SYSERR to close it (signal serious error)
2759 handle_mesh_path_broken (void *cls, const struct GNUNET_PeerIdentity *peer,
2760 const struct GNUNET_MessageHeader *message,
2761 const struct GNUNET_ATS_Information *atsi,
2762 unsigned int atsi_count)
2764 struct GNUNET_MESH_PathBroken *msg;
2765 struct MeshTunnel *t;
2767 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2768 "MESH: Received a PATH BROKEN msg from %s\n", GNUNET_i2s (peer));
2769 msg = (struct GNUNET_MESH_PathBroken *) message;
2770 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: regarding %s\n",
2771 GNUNET_i2s (&msg->peer1));
2772 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: regarding %s\n",
2773 GNUNET_i2s (&msg->peer2));
2774 t = tunnel_get (&msg->oid, ntohl (msg->tid));
2777 GNUNET_break_op (0);
2780 tunnel_notify_connection_broken (t, GNUNET_PEER_search (&msg->peer1),
2781 GNUNET_PEER_search (&msg->peer2));
2788 * Core handler for tunnel destruction
2790 * @param cls closure
2791 * @param message message
2792 * @param peer peer identity this notification is about
2793 * @param atsi performance data
2794 * @param atsi_count number of records in 'atsi'
2796 * @return GNUNET_OK to keep the connection open,
2797 * GNUNET_SYSERR to close it (signal serious error)
2800 handle_mesh_tunnel_destroy (void *cls, const struct GNUNET_PeerIdentity *peer,
2801 const struct GNUNET_MessageHeader *message,
2802 const struct GNUNET_ATS_Information *atsi,
2803 unsigned int atsi_count)
2805 struct GNUNET_MESH_TunnelDestroy *msg;
2806 struct MeshTunnel *t;
2808 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2809 "MESH: Got a TUNNEL DESTROY packet from %s\n", GNUNET_i2s (peer));
2810 msg = (struct GNUNET_MESH_TunnelDestroy *) message;
2811 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: for tunnel %s [%u]\n",
2812 GNUNET_i2s (&msg->oid), ntohl (msg->tid));
2813 t = tunnel_get (&msg->oid, ntohl (msg->tid));
2816 /* Probably already got the message from another path,
2817 * destroyed the tunnel and retransmitted to children.
2822 if (t->id.oid == myid)
2824 GNUNET_break_op (0);
2827 if (t->local_tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
2829 /* Tunnel was incoming, notify clients */
2830 send_clients_tunnel_destroy (t);
2832 tunnel_send_destroy (t);
2839 * Core handler for mesh network traffic going from the origin to a peer
2841 * @param cls closure
2842 * @param peer peer identity this notification is about
2843 * @param message message
2844 * @param atsi performance data
2845 * @param atsi_count number of records in 'atsi'
2846 * @return GNUNET_OK to keep the connection open,
2847 * GNUNET_SYSERR to close it (signal serious error)
2850 handle_mesh_data_unicast (void *cls, const struct GNUNET_PeerIdentity *peer,
2851 const struct GNUNET_MessageHeader *message,
2852 const struct GNUNET_ATS_Information *atsi,
2853 unsigned int atsi_count)
2855 struct GNUNET_MESH_Unicast *msg;
2856 struct MeshTunnel *t;
2860 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: got a unicast packet from %s\n",
2862 size = ntohs (message->size);
2864 sizeof (struct GNUNET_MESH_Unicast) +
2865 sizeof (struct GNUNET_MessageHeader))
2870 msg = (struct GNUNET_MESH_Unicast *) message;
2871 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: of type %u\n",
2872 ntohs (msg[1].header.type));
2873 t = tunnel_get (&msg->oid, ntohl (msg->tid));
2876 /* TODO notify back: we don't know this tunnel */
2877 GNUNET_break_op (0);
2880 tunnel_reset_timeout (t);
2881 pid = GNUNET_PEER_search (&msg->destination);
2884 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2885 "MESH: it's for us! sending to clients...\n");
2886 send_subscribed_clients (message, (struct GNUNET_MessageHeader *) &msg[1]);
2889 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2890 "MESH: not for us, retransmitting...\n");
2891 send_message (message, tree_get_first_hop (t->tree, pid));
2897 * Core handler for mesh network traffic going from the origin to all peers
2899 * @param cls closure
2900 * @param message message
2901 * @param peer peer identity this notification is about
2902 * @param atsi performance data
2903 * @param atsi_count number of records in 'atsi'
2904 * @return GNUNET_OK to keep the connection open,
2905 * GNUNET_SYSERR to close it (signal serious error)
2907 * TODO: Check who we got this from, to validate route.
2910 handle_mesh_data_multicast (void *cls, const struct GNUNET_PeerIdentity *peer,
2911 const struct GNUNET_MessageHeader *message,
2912 const struct GNUNET_ATS_Information *atsi,
2913 unsigned int atsi_count)
2915 struct GNUNET_MESH_Multicast *msg;
2916 struct MeshTunnel *t;
2919 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: got a multicast packet from %s\n",
2921 size = ntohs (message->size);
2922 if (sizeof (struct GNUNET_MESH_Multicast) +
2923 sizeof (struct GNUNET_MessageHeader) > size)
2925 GNUNET_break_op (0);
2928 msg = (struct GNUNET_MESH_Multicast *) message;
2929 t = tunnel_get (&msg->oid, ntohl (msg->tid));
2933 /* TODO notify that we dont know that tunnel */
2934 GNUNET_break_op (0);
2937 if (t->mid == ntohl (msg->mid))
2939 /* FIXME: already seen this packet, log dropping */
2940 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2941 "MESH: Already seen mid %u, DROPPING!\n",
2948 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2949 "MESH: mid %u not seen yet, forwarding\n",
2953 t->mid = ntohl (msg->mid);
2954 tunnel_reset_timeout (t);
2956 /* Transmit to locally interested clients */
2957 if (NULL != t->peers &&
2958 GNUNET_CONTAINER_multihashmap_contains (t->peers, &my_full_id.hashPubKey))
2960 send_subscribed_clients (message, &msg[1].header);
2963 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2967 if (ntohl (msg->ttl) == 0)
2969 /* FIXME: ttl is 0, log dropping */
2970 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2971 "MESH: TTL is 0, DROPPING!\n");
2974 tunnel_send_multicast (t, message);
2980 * Core handler for mesh network traffic toward the owner of a tunnel
2982 * @param cls closure
2983 * @param message message
2984 * @param peer peer identity this notification is about
2985 * @param atsi performance data
2986 * @param atsi_count number of records in 'atsi'
2988 * @return GNUNET_OK to keep the connection open,
2989 * GNUNET_SYSERR to close it (signal serious error)
2992 handle_mesh_data_to_orig (void *cls, const struct GNUNET_PeerIdentity *peer,
2993 const struct GNUNET_MessageHeader *message,
2994 const struct GNUNET_ATS_Information *atsi,
2995 unsigned int atsi_count)
2997 struct GNUNET_MESH_ToOrigin *msg;
2998 struct GNUNET_PeerIdentity id;
2999 struct MeshPeerInfo *peer_info;
3000 struct MeshTunnel *t;
3003 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: got a ToOrigin packet from %s\n",
3005 size = ntohs (message->size);
3006 if (size < sizeof (struct GNUNET_MESH_ToOrigin) + /* Payload must be */
3007 sizeof (struct GNUNET_MessageHeader)) /* at least a header */
3009 GNUNET_break_op (0);
3012 msg = (struct GNUNET_MESH_ToOrigin *) message;
3013 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: of type %u\n",
3014 ntohs (msg[1].header.type));
3015 t = tunnel_get (&msg->oid, ntohl (msg->tid));
3019 /* TODO notify that we dont know this tunnel (whom)? */
3020 GNUNET_break_op (0);
3024 if (t->id.oid == myid)
3027 struct GNUNET_MESH_ToOrigin *copy;
3029 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3030 "MESH: it's for us! sending to clients...\n");
3031 if (NULL == t->client)
3033 /* got data packet for ownerless tunnel */
3034 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: no clients!\n");
3035 GNUNET_break_op (0);
3038 /* TODO signature verification */
3039 memcpy (cbuf, message, size);
3040 copy = (struct GNUNET_MESH_ToOrigin *) cbuf;
3041 copy->tid = htonl (t->local_tid);
3042 GNUNET_SERVER_notification_context_unicast (nc, t->client->handle,
3043 ©->header, GNUNET_YES);
3046 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3047 "MESH: not for us, retransmitting...\n");
3049 peer_info = peer_info_get (&msg->oid);
3050 if (NULL == peer_info)
3052 /* unknown origin of tunnel */
3056 GNUNET_PEER_resolve (tree_get_predecessor (t->tree), &id);
3057 send_message (message, &id);
3064 * Core handler for path ACKs
3066 * @param cls closure
3067 * @param message message
3068 * @param peer peer identity this notification is about
3069 * @param atsi performance data
3070 * @param atsi_count number of records in 'atsi'
3072 * @return GNUNET_OK to keep the connection open,
3073 * GNUNET_SYSERR to close it (signal serious error)
3076 handle_mesh_path_ack (void *cls, const struct GNUNET_PeerIdentity *peer,
3077 const struct GNUNET_MessageHeader *message,
3078 const struct GNUNET_ATS_Information *atsi,
3079 unsigned int atsi_count)
3081 struct GNUNET_MESH_PathACK *msg;
3082 struct GNUNET_PeerIdentity id;
3083 struct MeshPeerInfo *peer_info;
3084 struct MeshPeerPath *p;
3085 struct MeshTunnel *t;
3087 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Received a path ACK msg [%s]\n",
3088 GNUNET_i2s (&my_full_id));
3089 msg = (struct GNUNET_MESH_PathACK *) message;
3090 t = tunnel_get (&msg->oid, msg->tid);
3093 /* TODO notify that we don't know the tunnel */
3097 peer_info = peer_info_get (&msg->peer_id);
3099 /* Add paths to peers? */
3100 p = tree_get_path_to_peer(t->tree, peer_info->id);
3103 path_add_to_peers (p, GNUNET_YES);
3111 /* Message for us? */
3112 if (0 == memcmp (&msg->oid, &my_full_id, sizeof (struct GNUNET_PeerIdentity)))
3114 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: It's for us!\n");
3115 if (NULL == t->client)
3117 GNUNET_break_op (0);
3120 if (NULL != t->dht_get_type)
3122 GNUNET_DHT_get_stop (t->dht_get_type);
3123 t->dht_get_type = NULL;
3125 if (tree_get_status(t->tree, peer_info->id) != MESH_PEER_READY)
3127 tree_set_status (t->tree, peer_info->id, MESH_PEER_READY);
3128 send_client_peer_connected (t, peer_info->id);
3133 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3134 "MESH: not for us, retransmitting...\n");
3135 GNUNET_PEER_resolve (tree_get_predecessor (t->tree), &id);
3136 peer_info = peer_info_get (&msg->oid);
3137 if (NULL == peer_info)
3139 /* If we know the tunnel, we should DEFINITELY know the peer */
3143 send_message (message, &id);
3149 * Functions to handle messages from core
3151 static struct GNUNET_CORE_MessageHandler core_handlers[] = {
3152 {&handle_mesh_path_create, GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE, 0},
3153 {&handle_mesh_path_destroy, GNUNET_MESSAGE_TYPE_MESH_PATH_DESTROY, 0},
3154 {&handle_mesh_path_broken, GNUNET_MESSAGE_TYPE_MESH_PATH_BROKEN,
3155 sizeof (struct GNUNET_MESH_PathBroken)},
3156 {&handle_mesh_tunnel_destroy, GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY, 0},
3157 {&handle_mesh_data_unicast, GNUNET_MESSAGE_TYPE_MESH_UNICAST, 0},
3158 {&handle_mesh_data_multicast, GNUNET_MESSAGE_TYPE_MESH_MULTICAST, 0},
3159 {&handle_mesh_data_to_orig, GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN, 0},
3160 {&handle_mesh_path_ack, GNUNET_MESSAGE_TYPE_MESH_PATH_ACK,
3161 sizeof (struct GNUNET_MESH_PathACK)},
3167 /******************************************************************************/
3168 /**************** MESH LOCAL HANDLER HELPERS ***********************/
3169 /******************************************************************************/
3172 * deregister_app: iterator for removing each application registered by a client
3174 * @param cls closure
3175 * @param key the hash of the application id (used to access the hashmap)
3176 * @param value the value stored at the key (client)
3178 * @return GNUNET_OK on success
3181 deregister_app (void *cls, const GNUNET_HashCode * key, void *value)
3183 GNUNET_break (GNUNET_YES ==
3184 GNUNET_CONTAINER_multihashmap_remove (applications, key,
3191 * notify_client_connection_failure: notify a client that the connection to the
3192 * requested remote peer is not possible (for instance, no route found)
3193 * Function called when the socket is ready to queue more data. "buf" will be
3194 * NULL and "size" zero if the socket was closed for writing in the meantime.
3196 * @param cls closure
3197 * @param size number of bytes available in buf
3198 * @param buf where the callee should write the message
3199 * @return number of bytes written to buf
3202 notify_client_connection_failure (void *cls, size_t size, void *buf)
3205 struct MeshPeerInfo *peer_info;
3206 struct GNUNET_MESH_PeerControl *msg;
3207 struct GNUNET_PeerIdentity id;
3209 if (0 == size && NULL == buf)
3211 // TODO retry? cancel?
3215 size_needed = sizeof (struct GNUNET_MESH_PeerControl);
3216 peer_info = (struct MeshPeerInfo *) cls;
3217 msg = (struct GNUNET_MESH_PeerControl *) buf;
3218 msg->header.size = htons (sizeof (struct GNUNET_MESH_PeerControl));
3219 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_DISCONNECTED);
3220 // msg->tunnel_id = htonl(peer_info->t->tid);
3221 GNUNET_PEER_resolve (peer_info->id, &id);
3222 memcpy (&msg->peer, &id, sizeof (struct GNUNET_PeerIdentity));
3230 * Send keepalive packets for a peer
3232 * @param cls Closure (tunnel for which to send the keepalive).
3233 * @param tc Notification context.
3235 * TODO: implement explicit multicast keepalive?
3238 path_refresh (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
3240 struct MeshTunnel *t = cls;
3241 struct GNUNET_MessageHeader *payload;
3242 struct GNUNET_MESH_Multicast *msg;
3244 sizeof (struct GNUNET_MESH_Multicast) +
3245 sizeof (struct GNUNET_MessageHeader);
3248 if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN)
3252 t->path_refresh_task = GNUNET_SCHEDULER_NO_TASK;
3254 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3255 "MESH: sending keepalive for tunnel %d\n", t->id.tid);
3257 msg = (struct GNUNET_MESH_Multicast *) cbuf;
3258 msg->header.size = htons (size);
3259 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_MULTICAST);
3260 msg->oid = my_full_id;
3261 msg->tid = htonl (t->id.tid);
3262 payload = (struct GNUNET_MessageHeader *) &msg[1];
3263 payload->size = htons (sizeof (struct GNUNET_MessageHeader));
3264 payload->type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_KEEPALIVE);
3265 tunnel_send_multicast (t, &msg->header);
3267 t->path_refresh_task =
3268 GNUNET_SCHEDULER_add_delayed (REFRESH_PATH_TIME, &path_refresh, t);
3274 * Function to process paths received for a new peer addition. The recorded
3275 * paths form the initial tunnel, which can be optimized later.
3276 * Called on each result obtained for the DHT search.
3278 * @param cls closure
3279 * @param exp when will this value expire
3280 * @param key key of the result
3281 * @param get_path path of the get request
3282 * @param get_path_length lenght of get_path
3283 * @param put_path path of the put request
3284 * @param put_path_length length of the put_path
3285 * @param type type of the result
3286 * @param size number of bytes in data
3287 * @param data pointer to the result data
3289 * TODO: re-issue the request after certain time? cancel after X results?
3292 dht_get_id_handler (void *cls, struct GNUNET_TIME_Absolute exp,
3293 const GNUNET_HashCode * key,
3294 const struct GNUNET_PeerIdentity *get_path,
3295 unsigned int get_path_length,
3296 const struct GNUNET_PeerIdentity *put_path,
3297 unsigned int put_path_length, enum GNUNET_BLOCK_Type type,
3298 size_t size, const void *data)
3300 struct MeshPathInfo *path_info = cls;
3301 struct MeshPeerPath *p;
3302 struct GNUNET_PeerIdentity pi;
3305 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Got results from DHT!\n");
3306 GNUNET_PEER_resolve (path_info->peer->id, &pi);
3307 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: for %s\n", GNUNET_i2s (&pi));
3309 p = path_build_from_dht (get_path, get_path_length, put_path,
3311 path_add_to_peers(p, GNUNET_NO);
3312 for (i = 0; i < path_info->peer->ntunnels; i++)
3314 tunnel_add_peer (path_info->peer->tunnels[i], path_info->peer);
3315 peer_info_connect (path_info->peer, path_info->t);
3323 * Function to process paths received for a new peer addition. The recorded
3324 * paths form the initial tunnel, which can be optimized later.
3325 * Called on each result obtained for the DHT search.
3327 * @param cls closure
3328 * @param exp when will this value expire
3329 * @param key key of the result
3330 * @param get_path path of the get request
3331 * @param get_path_length lenght of get_path
3332 * @param put_path path of the put request
3333 * @param put_path_length length of the put_path
3334 * @param type type of the result
3335 * @param size number of bytes in data
3336 * @param data pointer to the result data
3339 dht_get_type_handler (void *cls, struct GNUNET_TIME_Absolute exp,
3340 const GNUNET_HashCode * key,
3341 const struct GNUNET_PeerIdentity *get_path,
3342 unsigned int get_path_length,
3343 const struct GNUNET_PeerIdentity *put_path,
3344 unsigned int put_path_length, enum GNUNET_BLOCK_Type type,
3345 size_t size, const void *data)
3347 const struct GNUNET_PeerIdentity *pi = data;
3348 struct MeshTunnel *t = cls;
3349 struct MeshPeerInfo *peer_info;
3350 struct MeshPeerPath *p;
3352 if (size != sizeof (struct GNUNET_PeerIdentity))
3354 GNUNET_break_op (0);
3357 GNUNET_assert (NULL != t->client);
3358 peer_info = peer_info_get (pi);
3359 (void) GNUNET_CONTAINER_multihashmap_put (t->peers, &pi->hashPubKey,
3361 GNUNET_CONTAINER_MULTIHASHMAPOPTION_REPLACE);
3363 p = path_build_from_dht (get_path, get_path_length, put_path,
3365 path_add_to_peers(p, GNUNET_NO);
3366 tunnel_add_peer (t, peer_info);
3367 peer_info_connect (peer_info, t);
3371 /******************************************************************************/
3372 /********************* MESH LOCAL HANDLES **************************/
3373 /******************************************************************************/
3377 * Handler for client disconnection
3379 * @param cls closure
3380 * @param client identification of the client; NULL
3381 * for the last call when the server is destroyed
3384 handle_local_client_disconnect (void *cls, struct GNUNET_SERVER_Client *client)
3386 struct MeshClient *c;
3387 struct MeshClient *next;
3389 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: client disconnected\n");
3392 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: (SERVER DOWN)\n");
3398 if (c->handle != client && NULL != client)
3400 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: ... searching\n");
3404 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: matching client found\n");
3405 GNUNET_SERVER_client_drop (c->handle);
3406 if (NULL != c->tunnels)
3408 GNUNET_CONTAINER_multihashmap_iterate (c->tunnels,
3409 &tunnel_destroy_iterator, c);
3410 GNUNET_CONTAINER_multihashmap_destroy (c->tunnels);
3413 /* deregister clients applications */
3414 if (NULL != c->apps)
3416 GNUNET_CONTAINER_multihashmap_iterate (c->apps, &deregister_app, NULL);
3417 GNUNET_CONTAINER_multihashmap_destroy (c->apps);
3419 if (0 == GNUNET_CONTAINER_multihashmap_size (applications) &&
3420 GNUNET_SCHEDULER_NO_TASK != announce_applications_task)
3422 GNUNET_SCHEDULER_cancel (announce_applications_task);
3423 announce_applications_task = GNUNET_SCHEDULER_NO_TASK;
3425 if (NULL != c->types)
3426 GNUNET_CONTAINER_multihashmap_destroy (c->types);
3428 GNUNET_CONTAINER_DLL_remove (clients, clients_tail, c);
3429 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: CLIENT FREE at %p\n", c);
3434 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: done!\n");
3440 * Handler for new clients
3442 * @param cls closure
3443 * @param client identification of the client
3444 * @param message the actual message, which includes messages the client wants
3447 handle_local_new_client (void *cls, struct GNUNET_SERVER_Client *client,
3448 const struct GNUNET_MessageHeader *message)
3450 struct GNUNET_MESH_ClientConnect *cc_msg;
3451 struct MeshClient *c;
3452 GNUNET_MESH_ApplicationType *a;
3459 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: new client connected\n");
3460 /* Check data sanity */
3461 size = ntohs (message->size) - sizeof (struct GNUNET_MESH_ClientConnect);
3462 cc_msg = (struct GNUNET_MESH_ClientConnect *) message;
3463 ntypes = ntohs (cc_msg->types);
3464 napps = ntohs (cc_msg->applications);
3466 ntypes * sizeof (uint16_t) + napps * sizeof (GNUNET_MESH_ApplicationType))
3469 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3473 /* Create new client structure */
3474 c = GNUNET_malloc (sizeof (struct MeshClient));
3476 c->id = next_client_id++;
3477 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: CLIENT NEW %u at %p\n", c->id,
3481 GNUNET_SERVER_client_keep (client);
3482 a = (GNUNET_MESH_ApplicationType *) &cc_msg[1];
3485 GNUNET_MESH_ApplicationType at;
3488 c->apps = GNUNET_CONTAINER_multihashmap_create (napps);
3489 for (i = 0; i < napps; i++)
3492 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: app type: %u\n", at);
3493 GNUNET_CRYPTO_hash (&at, sizeof (at), &hc);
3494 /* store in clients hashmap */
3495 GNUNET_CONTAINER_multihashmap_put (c->apps, &hc, c,
3496 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
3497 /* store in global hashmap, for announcements */
3498 GNUNET_CONTAINER_multihashmap_put (applications, &hc, c,
3499 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
3501 if (GNUNET_SCHEDULER_NO_TASK == announce_applications_task)
3502 announce_applications_task =
3503 GNUNET_SCHEDULER_add_now (&announce_applications, NULL);
3511 t = (uint16_t *) & a[napps];
3512 c->types = GNUNET_CONTAINER_multihashmap_create (ntypes);
3513 for (i = 0; i < ntypes; i++)
3516 GNUNET_CRYPTO_hash (&u16, sizeof (u16), &hc);
3518 /* store in clients hashmap */
3519 GNUNET_CONTAINER_multihashmap_put (c->types, &hc, c,
3520 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
3521 /* store in global hashmap */
3522 GNUNET_CONTAINER_multihashmap_put (types, &hc, c,
3523 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
3526 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3527 "MESH: client has %u+%u subscriptions\n", napps, ntypes);
3529 GNUNET_CONTAINER_DLL_insert (clients, clients_tail, c);
3530 c->tunnels = GNUNET_CONTAINER_multihashmap_create (32);
3531 GNUNET_SERVER_notification_context_add (nc, client);
3533 GNUNET_SERVER_receive_done (client, GNUNET_OK);
3535 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: new client processed\n");
3541 * Handler for requests of new tunnels
3543 * @param cls closure
3544 * @param client identification of the client
3545 * @param message the actual message
3548 handle_local_tunnel_create (void *cls, struct GNUNET_SERVER_Client *client,
3549 const struct GNUNET_MessageHeader *message)
3551 struct GNUNET_MESH_TunnelMessage *t_msg;
3552 struct MeshTunnel *t;
3553 struct MeshClient *c;
3554 GNUNET_HashCode hash;
3556 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: new tunnel requested\n");
3558 /* Sanity check for client registration */
3559 if (NULL == (c = client_get (client)))
3562 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3566 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: by client %u\n", c->id);
3569 /* Message sanity check */
3570 if (sizeof (struct GNUNET_MESH_TunnelMessage) != ntohs (message->size))
3573 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3577 t_msg = (struct GNUNET_MESH_TunnelMessage *) message;
3578 /* Sanity check for tunnel numbering */
3579 if (0 == (ntohl (t_msg->tunnel_id) & GNUNET_MESH_LOCAL_TUNNEL_ID_CLI))
3582 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3585 /* Sanity check for duplicate tunnel IDs */
3586 if (NULL != tunnel_get_by_local_id (c, ntohl (t_msg->tunnel_id)))
3589 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3593 t = GNUNET_malloc (sizeof (struct MeshTunnel));
3594 while (NULL != tunnel_get_by_pi (myid, next_tid))
3595 next_tid = (next_tid + 1) & ~GNUNET_MESH_LOCAL_TUNNEL_ID_CLI;
3596 t->id.tid = next_tid++;
3597 next_tid = next_tid & ~GNUNET_MESH_LOCAL_TUNNEL_ID_CLI;
3599 t->local_tid = ntohl (t_msg->tunnel_id);
3601 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: CREATED TUNNEL %s [%x] (%x)\n",
3602 GNUNET_i2s (&my_full_id), t->id.tid, t->local_tid);
3605 t->peers = GNUNET_CONTAINER_multihashmap_create (32);
3607 GNUNET_CRYPTO_hash (&t->local_tid, sizeof (MESH_TunnelNumber), &hash);
3609 GNUNET_CONTAINER_multihashmap_put (c->tunnels, &hash, t,
3610 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
3613 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3617 GNUNET_CRYPTO_hash (&t->id, sizeof (struct MESH_TunnelID), &hash);
3619 GNUNET_CONTAINER_multihashmap_put (tunnels, &hash, t,
3620 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
3623 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3626 t->tree = tree_new (myid);
3628 GNUNET_SERVER_receive_done (client, GNUNET_OK);
3634 * Handler for requests of deleting tunnels
3636 * @param cls closure
3637 * @param client identification of the client
3638 * @param message the actual message
3641 handle_local_tunnel_destroy (void *cls, struct GNUNET_SERVER_Client *client,
3642 const struct GNUNET_MessageHeader *message)
3644 struct GNUNET_MESH_TunnelMessage *tunnel_msg;
3645 struct MeshClient *c;
3646 struct MeshTunnel *t;
3647 MESH_TunnelNumber tid;
3648 GNUNET_HashCode hash;
3650 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3651 "MESH: Got a DESTROY TUNNEL from client!\n");
3653 /* Sanity check for client registration */
3654 if (NULL == (c = client_get (client)))
3657 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3660 /* Message sanity check */
3661 if (sizeof (struct GNUNET_MESH_TunnelMessage) != ntohs (message->size))
3664 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3668 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: by client %u\n", c->id);
3670 tunnel_msg = (struct GNUNET_MESH_TunnelMessage *) message;
3672 /* Retrieve tunnel */
3673 tid = ntohl (tunnel_msg->tunnel_id);
3675 /* Remove from local id hashmap */
3676 GNUNET_CRYPTO_hash (&tid, sizeof (MESH_TunnelNumber), &hash);
3677 t = GNUNET_CONTAINER_multihashmap_get (c->tunnels, &hash);
3678 GNUNET_assert (GNUNET_YES ==
3679 GNUNET_CONTAINER_multihashmap_remove (c->tunnels, &hash, t));
3682 tunnel_send_destroy (t);
3684 GNUNET_SERVER_receive_done (client, GNUNET_OK);
3690 * Handler for connection requests to new peers
3692 * @param cls closure
3693 * @param client identification of the client
3694 * @param message the actual message (PeerControl)
3697 handle_local_connect_add (void *cls, struct GNUNET_SERVER_Client *client,
3698 const struct GNUNET_MessageHeader *message)
3700 struct GNUNET_MESH_PeerControl *peer_msg;
3701 struct MeshPeerInfo *peer_info;
3702 struct MeshClient *c;
3703 struct MeshTunnel *t;
3704 MESH_TunnelNumber tid;
3706 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Got connection request\n");
3707 /* Sanity check for client registration */
3708 if (NULL == (c = client_get (client)))
3711 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3715 peer_msg = (struct GNUNET_MESH_PeerControl *) message;
3716 /* Sanity check for message size */
3717 if (sizeof (struct GNUNET_MESH_PeerControl) != ntohs (peer_msg->header.size))
3720 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3724 /* Tunnel exists? */
3725 tid = ntohl (peer_msg->tunnel_id);
3726 t = tunnel_get_by_local_id (c, tid);
3730 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3734 /* Does client own tunnel? */
3735 if (t->client->handle != client)
3738 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3741 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: for %s\n",
3742 GNUNET_i2s (&peer_msg->peer));
3743 peer_info = peer_info_get (&peer_msg->peer);
3745 tunnel_add_peer (t, peer_info);
3746 peer_info_connect (peer_info, t);
3748 GNUNET_SERVER_receive_done (client, GNUNET_OK);
3754 * Handler for disconnection requests of peers in a tunnel
3756 * @param cls closure
3757 * @param client identification of the client
3758 * @param message the actual message (PeerControl)
3761 handle_local_connect_del (void *cls, struct GNUNET_SERVER_Client *client,
3762 const struct GNUNET_MessageHeader *message)
3764 struct GNUNET_MESH_PeerControl *peer_msg;
3765 struct MeshPeerInfo *peer_info;
3766 struct MeshClient *c;
3767 struct MeshTunnel *t;
3768 MESH_TunnelNumber tid;
3770 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Got a PEER DEL request\n");
3771 /* Sanity check for client registration */
3772 if (NULL == (c = client_get (client)))
3775 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3778 peer_msg = (struct GNUNET_MESH_PeerControl *) message;
3779 /* Sanity check for message size */
3780 if (sizeof (struct GNUNET_MESH_PeerControl) != ntohs (peer_msg->header.size))
3783 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3787 /* Tunnel exists? */
3788 tid = ntohl (peer_msg->tunnel_id);
3789 t = tunnel_get_by_local_id (c, tid);
3793 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3796 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: on tunnel %X\n", t->id.tid);
3798 /* Does client own tunnel? */
3799 if (t->client->handle != client)
3802 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3806 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: for peer %s\n",
3807 GNUNET_i2s (&peer_msg->peer));
3808 /* Is the peer in the tunnel? */
3810 GNUNET_CONTAINER_multihashmap_get (t->peers, &peer_msg->peer.hashPubKey);
3811 if (NULL == peer_info)
3814 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3818 /* Ok, delete peer from tunnel */
3819 GNUNET_CONTAINER_multihashmap_remove_all (t->peers,
3820 &peer_msg->peer.hashPubKey);
3822 send_destroy_path (t, peer_info->id);
3823 tunnel_delete_peer (t, peer_info->id);
3824 GNUNET_SERVER_receive_done (client, GNUNET_OK);
3830 * Handler for connection requests to new peers by type
3832 * @param cls closure
3833 * @param client identification of the client
3834 * @param message the actual message (ConnectPeerByType)
3837 handle_local_connect_by_type (void *cls, struct GNUNET_SERVER_Client *client,
3838 const struct GNUNET_MessageHeader *message)
3840 struct GNUNET_MESH_ConnectPeerByType *connect_msg;
3841 struct MeshClient *c;
3842 struct MeshTunnel *t;
3843 GNUNET_HashCode hash;
3844 MESH_TunnelNumber tid;
3846 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: got connect by type request\n");
3847 /* Sanity check for client registration */
3848 if (NULL == (c = client_get (client)))
3851 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3855 connect_msg = (struct GNUNET_MESH_ConnectPeerByType *) message;
3856 /* Sanity check for message size */
3857 if (sizeof (struct GNUNET_MESH_ConnectPeerByType) !=
3858 ntohs (connect_msg->header.size))
3861 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3865 /* Tunnel exists? */
3866 tid = ntohl (connect_msg->tunnel_id);
3867 t = tunnel_get_by_local_id (c, tid);
3871 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3875 /* Does client own tunnel? */
3876 if (t->client->handle != client)
3879 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3883 /* Do WE have the service? */
3884 t->type = ntohl (connect_msg->type);
3885 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: type requested: %u\n", t->type);
3886 GNUNET_CRYPTO_hash (&t->type, sizeof (GNUNET_MESH_ApplicationType), &hash);
3887 if (GNUNET_CONTAINER_multihashmap_contains (applications, &hash) ==
3890 /* Yes! Fast forward, add ourselves to the tunnel and send the
3891 * good news to the client
3893 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: available locally\n");
3894 GNUNET_CONTAINER_multihashmap_put (t->peers, &my_full_id.hashPubKey,
3895 peer_info_get (&my_full_id),
3896 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
3898 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: notifying client\n");
3899 send_client_peer_connected (t, myid);
3900 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Done\n");
3901 GNUNET_SERVER_receive_done (client, GNUNET_OK);
3904 /* Ok, lets find a peer offering the service */
3905 if (NULL != t->dht_get_type)
3907 GNUNET_DHT_get_stop (t->dht_get_type);
3909 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: looking in DHT for %s\n",
3910 GNUNET_h2s (&hash));
3912 GNUNET_DHT_get_start (dht_handle, GNUNET_TIME_UNIT_FOREVER_REL,
3913 GNUNET_BLOCK_TYPE_TEST, &hash, 10U,
3914 GNUNET_DHT_RO_RECORD_ROUTE |
3915 GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE, NULL, 0,
3916 &dht_get_type_handler, t);
3918 GNUNET_SERVER_receive_done (client, GNUNET_OK);
3924 * Handler for client traffic directed to one peer
3926 * @param cls closure
3927 * @param client identification of the client
3928 * @param message the actual message
3931 handle_local_unicast (void *cls, struct GNUNET_SERVER_Client *client,
3932 const struct GNUNET_MessageHeader *message)
3934 struct MeshClient *c;
3935 struct MeshTunnel *t;
3936 struct MeshPeerInfo *pi;
3937 struct GNUNET_MESH_Unicast *data_msg;
3938 MESH_TunnelNumber tid;
3941 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3942 "MESH: Got a unicast request from a client!\n");
3944 /* Sanity check for client registration */
3945 if (NULL == (c = client_get (client)))
3948 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3951 data_msg = (struct GNUNET_MESH_Unicast *) message;
3952 /* Sanity check for message size */
3953 size = ntohs (message->size);
3954 if (sizeof (struct GNUNET_MESH_Unicast) +
3955 sizeof (struct GNUNET_MessageHeader) > size)
3958 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3962 /* Tunnel exists? */
3963 tid = ntohl (data_msg->tid);
3964 t = tunnel_get_by_local_id (c, tid);
3968 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3972 /* Is it a local tunnel? Then, does client own the tunnel? */
3973 if (NULL != t->client && NULL != t->client->handle &&
3974 t->client->handle != client)
3977 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3981 pi = GNUNET_CONTAINER_multihashmap_get (t->peers,
3982 &data_msg->destination.hashPubKey);
3983 /* Is the selected peer in the tunnel? */
3987 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3991 /* Ok, everything is correct, send the message
3992 * (pretend we got it from a mesh peer)
3995 char buf[ntohs (message->size)];
3996 struct GNUNET_MESH_Unicast *copy;
3998 /* Work around const limitation */
3999 copy = (struct GNUNET_MESH_Unicast *) buf;
4000 memcpy (buf, data_msg, size);
4001 copy->oid = my_full_id;
4002 copy->tid = htonl (t->id.tid);
4003 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4004 "MESH: calling generic handler...\n");
4005 handle_mesh_data_unicast (NULL, &my_full_id, ©->header, NULL, 0);
4007 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4013 * Handler for client traffic directed to the origin
4015 * @param cls closure
4016 * @param client identification of the client
4017 * @param message the actual message
4020 handle_local_to_origin (void *cls, struct GNUNET_SERVER_Client *client,
4021 const struct GNUNET_MessageHeader *message)
4023 struct GNUNET_MESH_ToOrigin *data_msg;
4024 struct GNUNET_PeerIdentity id;
4025 struct MeshClient *c;
4026 struct MeshTunnel *t;
4027 MESH_TunnelNumber tid;
4030 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4031 "MESH: Got a ToOrigin request from a client!\n");
4033 /* Sanity check for client registration */
4034 if (NULL == (c = client_get (client)))
4037 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4040 data_msg = (struct GNUNET_MESH_ToOrigin *) message;
4041 /* Sanity check for message size */
4042 size = ntohs (message->size);
4043 if (sizeof (struct GNUNET_MESH_ToOrigin) +
4044 sizeof (struct GNUNET_MessageHeader) > size)
4047 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4051 /* Tunnel exists? */
4052 tid = ntohl (data_msg->tid);
4053 if (tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
4056 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4059 t = tunnel_get_by_local_id (c, tid);
4063 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4067 /* It shouldn't be a local tunnel. */
4068 if (NULL != t->client)
4071 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4074 GNUNET_PEER_resolve (t->id.oid, &id);
4076 /* Ok, everything is correct, send the message
4077 * (pretend we got it from a mesh peer)
4080 char buf[ntohs (message->size)];
4081 struct GNUNET_MESH_ToOrigin *copy;
4083 /* Work around const limitation */
4084 copy = (struct GNUNET_MESH_ToOrigin *) buf;
4085 memcpy (buf, data_msg, size);
4087 copy->tid = htonl (t->id.tid);
4088 copy->sender = my_full_id;
4089 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4090 "MESH: calling generic handler...\n");
4091 handle_mesh_data_to_orig (NULL, &my_full_id, ©->header, NULL, 0);
4093 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4099 * Handler for client traffic directed to all peers in a tunnel
4101 * @param cls closure
4102 * @param client identification of the client
4103 * @param message the actual message
4106 handle_local_multicast (void *cls, struct GNUNET_SERVER_Client *client,
4107 const struct GNUNET_MessageHeader *message)
4109 struct MeshClient *c;
4110 struct MeshTunnel *t;
4111 struct GNUNET_MESH_Multicast *data_msg;
4112 MESH_TunnelNumber tid;
4114 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4115 "MESH: Got a multicast request from a client!\n");
4117 /* Sanity check for client registration */
4118 if (NULL == (c = client_get (client)))
4121 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4124 data_msg = (struct GNUNET_MESH_Multicast *) message;
4125 /* Sanity check for message size */
4126 if (sizeof (struct GNUNET_MESH_Multicast) +
4127 sizeof (struct GNUNET_MessageHeader) > ntohs (data_msg->header.size))
4130 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4134 /* Tunnel exists? */
4135 tid = ntohl (data_msg->tid);
4136 t = tunnel_get_by_local_id (c, tid);
4140 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4144 /* Does client own tunnel? */
4145 if (t->client->handle != client)
4148 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4153 char buf[ntohs (message->size)];
4154 struct GNUNET_MESH_Multicast *copy;
4156 copy = (struct GNUNET_MESH_Multicast *) buf;
4157 memcpy (buf, message, ntohs (message->size));
4158 copy->oid = my_full_id;
4159 copy->tid = htonl (t->id.tid);
4160 copy->ttl = htonl (DEFAULT_TTL);
4161 copy->mid = htonl (t->mid + 1);
4162 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4163 "MESH: calling generic handler...\n");
4164 handle_mesh_data_multicast (client, &my_full_id, ©->header, NULL, 0);
4167 /* receive done gets called when last copy is sent to a neighbor */
4172 * Functions to handle messages from clients
4174 static struct GNUNET_SERVER_MessageHandler client_handlers[] = {
4175 {&handle_local_new_client, NULL,
4176 GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT, 0},
4177 {&handle_local_tunnel_create, NULL,
4178 GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE,
4179 sizeof (struct GNUNET_MESH_TunnelMessage)},
4180 {&handle_local_tunnel_destroy, NULL,
4181 GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY,
4182 sizeof (struct GNUNET_MESH_TunnelMessage)},
4183 {&handle_local_connect_add, NULL,
4184 GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD,
4185 sizeof (struct GNUNET_MESH_PeerControl)},
4186 {&handle_local_connect_del, NULL,
4187 GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_DEL,
4188 sizeof (struct GNUNET_MESH_PeerControl)},
4189 {&handle_local_connect_by_type, NULL,
4190 GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD_BY_TYPE,
4191 sizeof (struct GNUNET_MESH_ConnectPeerByType)},
4192 {&handle_local_unicast, NULL,
4193 GNUNET_MESSAGE_TYPE_MESH_UNICAST, 0},
4194 {&handle_local_to_origin, NULL,
4195 GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN, 0},
4196 {&handle_local_multicast, NULL,
4197 GNUNET_MESSAGE_TYPE_MESH_MULTICAST, 0},
4203 * To be called on core init/fail.
4205 * @param cls service closure
4206 * @param server handle to the server for this service
4207 * @param identity the public identity of this peer
4210 core_init (void *cls, struct GNUNET_CORE_Handle *server,
4211 const struct GNUNET_PeerIdentity *identity)
4213 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Core init\n");
4214 core_handle = server;
4215 if (0 != memcmp (identity, &my_full_id, sizeof (my_full_id)) ||
4218 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, _("MESH: Wrong CORE service\n"));
4219 GNUNET_SCHEDULER_shutdown ();
4225 * Method called whenever a given peer connects.
4227 * @param cls closure
4228 * @param peer peer identity this notification is about
4229 * @param atsi performance data for the connection
4230 * @param atsi_count number of records in 'atsi'
4233 core_connect (void *cls, const struct GNUNET_PeerIdentity *peer,
4234 const struct GNUNET_ATS_Information *atsi,
4235 unsigned int atsi_count)
4237 struct MeshPeerInfo *peer_info;
4238 struct MeshPeerPath *path;
4240 #if MESH_DEBUG_CONNECTION
4241 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Peer connected\n");
4242 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: %s\n",
4243 GNUNET_i2s (&my_full_id));
4245 peer_info = peer_info_get (peer);
4246 if (myid == peer_info->id)
4248 #if MESH_DEBUG_CONNECTION
4249 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: (self)\n");
4253 #if MESH_DEBUG_CONNECTION
4256 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: %s\n", GNUNET_i2s (peer));
4259 path = path_new (2);
4260 path->peers[0] = myid;
4261 path->peers[1] = peer_info->id;
4262 GNUNET_PEER_change_rc (myid, 1);
4263 GNUNET_PEER_change_rc (peer_info->id, 1);
4264 peer_info_add_path (peer_info, path, GNUNET_YES);
4269 * Method called whenever a peer disconnects.
4271 * @param cls closure
4272 * @param peer peer identity this notification is about
4275 core_disconnect (void *cls, const struct GNUNET_PeerIdentity *peer)
4277 struct MeshPeerInfo *pi;
4280 #if MESH_DEBUG_CONNECTION
4281 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Peer disconnected\n");
4283 pi = GNUNET_CONTAINER_multihashmap_get (peers, &peer->hashPubKey);
4289 for (i = 0; i < CORE_QUEUE_SIZE; i++)
4291 /* TODO: notify that the transmission failed */
4292 peer_info_cancel_transmission (pi, i);
4294 peer_info_remove_path (pi, pi->id, myid);
4295 #if MESH_DEBUG_CONNECTION
4298 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: (self)\n");
4305 /******************************************************************************/
4306 /************************ MAIN FUNCTIONS ****************************/
4307 /******************************************************************************/
4310 * Iterator over tunnel hash map entries to destroy the tunnel during shutdown.
4312 * @param cls closure
4313 * @param key current key code
4314 * @param value value in the hash map
4315 * @return GNUNET_YES if we should continue to iterate,
4319 shutdown_tunnel (void *cls, const GNUNET_HashCode * key, void *value)
4321 struct MeshTunnel *t = value;
4328 * Iterator over peer hash map entries to destroy the tunnel during shutdown.
4330 * @param cls closure
4331 * @param key current key code
4332 * @param value value in the hash map
4333 * @return GNUNET_YES if we should continue to iterate,
4337 shutdown_peer (void *cls, const GNUNET_HashCode * key, void *value)
4339 struct MeshPeerInfo *p = value;
4341 peer_info_destroy (p);
4346 * Task run during shutdown.
4352 shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
4354 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: shutting down\n");
4355 /* TODO: destroy tunnels? */
4356 if (core_handle != NULL)
4358 GNUNET_CORE_disconnect (core_handle);
4361 GNUNET_CONTAINER_multihashmap_iterate (tunnels, &shutdown_tunnel, NULL);
4362 GNUNET_CONTAINER_multihashmap_iterate (peers, &shutdown_peer, NULL);
4363 if (dht_handle != NULL)
4365 GNUNET_DHT_disconnect (dht_handle);
4370 GNUNET_SERVER_notification_context_destroy (nc);
4373 if (GNUNET_SCHEDULER_NO_TASK != announce_id_task)
4375 GNUNET_SCHEDULER_cancel (announce_id_task);
4376 announce_id_task = GNUNET_SCHEDULER_NO_TASK;
4378 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: shut down\n");
4382 * Process mesh requests.
4384 * @param cls closure
4385 * @param server the initialized server
4386 * @param c configuration to use
4389 run (void *cls, struct GNUNET_SERVER_Handle *server,
4390 const struct GNUNET_CONFIGURATION_Handle *c)
4392 struct MeshPeerInfo *peer;
4393 struct MeshPeerPath *p;
4396 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: starting to run\n");
4397 server_handle = server;
4398 core_handle = GNUNET_CORE_connect (c, /* Main configuration */
4399 CORE_QUEUE_SIZE, /* queue size */
4400 NULL, /* Closure passed to MESH functions */
4401 &core_init, /* Call core_init once connected */
4402 &core_connect, /* Handle connects */
4403 &core_disconnect, /* remove peers on disconnects */
4404 NULL, /* Don't notify about all incoming messages */
4405 GNUNET_NO, /* For header only in notification */
4406 NULL, /* Don't notify about all outbound messages */
4407 GNUNET_NO, /* For header-only out notification */
4408 core_handlers); /* Register these handlers */
4410 if (core_handle == NULL)
4413 GNUNET_SCHEDULER_shutdown ();
4418 GNUNET_CONFIGURATION_get_value_filename (c, "GNUNETD", "HOSTKEY",
4421 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4423 ("Mesh service is lacking key configuration settings. Exiting.\n"));
4424 GNUNET_SCHEDULER_shutdown ();
4427 my_private_key = GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
4428 GNUNET_free (keyfile);
4429 if (my_private_key == NULL)
4431 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4432 _("Mesh service could not access hostkey. Exiting.\n"));
4433 GNUNET_SCHEDULER_shutdown ();
4436 GNUNET_CRYPTO_rsa_key_get_public (my_private_key, &my_public_key);
4437 GNUNET_CRYPTO_hash (&my_public_key, sizeof (my_public_key),
4438 &my_full_id.hashPubKey);
4439 myid = GNUNET_PEER_intern (&my_full_id);
4441 // // transport_handle = GNUNET_TRANSPORT_connect(c,
4448 dht_handle = GNUNET_DHT_connect (c, 64);
4449 if (dht_handle == NULL)
4455 next_local_tid = GNUNET_MESH_LOCAL_TUNNEL_ID_SERV;
4457 tunnels = GNUNET_CONTAINER_multihashmap_create (32);
4458 incoming_tunnels = GNUNET_CONTAINER_multihashmap_create (32);
4459 peers = GNUNET_CONTAINER_multihashmap_create (32);
4460 applications = GNUNET_CONTAINER_multihashmap_create (32);
4461 types = GNUNET_CONTAINER_multihashmap_create (32);
4463 GNUNET_SERVER_add_handlers (server_handle, client_handlers);
4464 nc = GNUNET_SERVER_notification_context_create (server_handle,
4466 GNUNET_SERVER_disconnect_notify (server_handle,
4467 &handle_local_client_disconnect, NULL);
4471 clients_tail = NULL;
4476 announce_applications_task = GNUNET_SCHEDULER_NO_TASK;
4477 announce_id_task = GNUNET_SCHEDULER_add_now (&announce_id, cls);
4479 /* Create a peer_info for the local peer */
4480 peer = peer_info_get (&my_full_id);
4483 GNUNET_PEER_change_rc (myid, 1);
4484 peer_info_add_path (peer, p, GNUNET_YES);
4486 /* Scheduled the task to clean up when shutdown is called */
4487 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &shutdown_task,
4490 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: end of run()\n");
4494 * The main function for the mesh service.
4496 * @param argc number of arguments from the command line
4497 * @param argv command line arguments
4498 * @return 0 ok, 1 on error
4501 main (int argc, char *const *argv)
4505 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: main()\n");
4508 GNUNET_SERVICE_run (argc, argv, "mesh", GNUNET_SERVICE_OPTION_NONE, &run,
4510 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: main() END\n");