2 This file is part of GNUnet.
3 (C) 2001 - 2011 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
22 * @file 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 * - add connection confirmation message
44 * - handle trnsmt_rdy return values
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,\
66 /******************************************************************************/
67 /************************ DATA STRUCTURES ****************************/
68 /******************************************************************************/
70 /** FWD declaration */
74 * Struct containing all info possibly needed to build a package when called
77 struct MeshDataDescriptor
79 /** ID of the tunnel this packet travels in */
80 struct MESH_TunnelID *origin;
82 /** Ultimate destination of the packet */
83 GNUNET_PEER_Id destination;
85 /** Number of identical messages sent to different hops (multicast) */
88 /** Size of the data */
91 /** Client that asked for the transmission, if any */
92 struct GNUNET_SERVER_Client *client;
94 /** Who was is message being sent to */
95 struct MeshPeerInfo *peer;
97 /** Which handler was used to request the transmission */
98 unsigned int handler_n;
100 /* Data at the end */
105 * Struct containing all information regarding a given peer
115 * Last time we heard from this peer
117 struct GNUNET_TIME_Absolute last_contact;
120 * Number of attempts to reconnect so far
122 int n_reconnect_attempts;
125 * Paths to reach the peer, ordered by ascending hop count
127 struct MeshPeerPath *path_head;
130 * Paths to reach the peer, ordered by ascending hop count
132 struct MeshPeerPath *path_tail;
135 * Handle to stop the DHT search for a path to this peer
137 struct GNUNET_DHT_GetHandle *dhtget;
140 * Handles to stop queued transmissions for this peer
142 struct GNUNET_CORE_TransmitHandle *core_transmit[CORE_QUEUE_SIZE];
145 * Pointer to info stuctures used as cls for queued transmissions
147 struct MeshDataDescriptor *infos[CORE_QUEUE_SIZE];
150 * Array of tunnels this peer participates in
151 * (most probably a small amount, therefore not a hashmap)
152 * When the path to the peer changes, notify these tunnels to let them
153 * re-adjust their path trees.
155 struct MeshTunnel **tunnels;
158 * Number of tunnels above
160 unsigned int ntunnels;
165 * Data scheduled to transmit (to local client or remote peer)
172 struct MeshQueue *next;
173 struct MeshQueue *prev;
176 * Target of the data (NULL if target is client)
178 struct MeshPeerInfo *peer;
181 * Client to send the data to (NULL if target is peer)
183 struct MeshClient *client;
186 * Size of the message to transmit
191 * How old is the data?
193 struct GNUNET_TIME_Absolute timestamp;
198 struct GNUNET_MessageHeader *data;
202 * Globally unique tunnel identification (owner + number)
203 * DO NOT USE OVER THE NETWORK
208 * Node that owns the tunnel
213 * Tunnel number to differentiate all the tunnels owned by the node oid
214 * ( tid < GNUNET_MESH_LOCAL_TUNNEL_ID_CLI )
216 MESH_TunnelNumber tid;
220 struct MeshClient; /* FWD declaration */
223 * Struct containing all information regarding a tunnel
224 * For an intermediate node the improtant info used will be:
225 * - id Tunnel unique identification
226 * - paths[0] To know where to send it next
227 * - metainfo: ready, speeds, accounting
234 struct MESH_TunnelID id;
237 * Local tunnel number ( >= GNUNET_MESH_LOCAL_TUNNEL_ID_CLI or 0 )
239 MESH_TunnelNumber local_tid;
242 * Last time the tunnel was used
244 struct GNUNET_TIME_Absolute timestamp;
247 * Peers in the tunnel, indexed by PeerIdentity -> (MeshPeerInfo)
249 struct GNUNET_CONTAINER_MultiHashMap *peers;
252 * Number of peers that are connected and potentially ready to receive data
254 unsigned int peers_ready;
257 * Number of peers that have been added to the tunnel
259 unsigned int peers_total;
262 * Client owner of the tunnel, if any
264 struct MeshClient *client;
267 * Messages ready to transmit
269 struct MeshQueue *queue_head;
270 struct MeshQueue *queue_tail;
275 struct MeshTunnelTree *tree;
278 * Task to keep the used paths alive
280 GNUNET_SCHEDULER_TaskIdentifier path_refresh_task;
285 * Info needed to work with tunnel paths and peers
292 struct MeshTunnel *t;
297 struct MeshPeerInfo *peer;
302 struct MeshPeerPath *path;
307 * Struct containing information about a client of the service
314 struct MeshClient *next;
315 struct MeshClient *prev;
318 * Tunnels that belong to this client, indexed by local id
320 struct GNUNET_CONTAINER_MultiHashMap *tunnels;
323 * Handle to communicate with the client
325 struct GNUNET_SERVER_Client *handle;
328 * Applications that this client has claimed to provide
330 struct GNUNET_CONTAINER_MultiHashMap *apps;
333 * Messages that this client has declared interest in
335 struct GNUNET_CONTAINER_MultiHashMap *types;
338 * Used to search peers offering a service
340 struct GNUNET_DHT_GetHandle *dht_get_type;
344 * ID of the client, for debug messages
353 /******************************************************************************/
354 /************************ DEBUG FUNCTIONS ****************************/
355 /******************************************************************************/
359 * GNUNET_SCHEDULER_Task for printing a message after some operation is done
360 * @param cls string to print
361 * @param tc task context
364 mesh_debug (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
368 if (GNUNET_SCHEDULER_REASON_SHUTDOWN == tc->reason)
372 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: %s\n", s);
377 /******************************************************************************/
378 /*********************** GLOBAL VARIABLES ****************************/
379 /******************************************************************************/
384 static struct MeshClient *clients;
385 static struct MeshClient *clients_tail;
388 * Tunnels known, indexed by MESH_TunnelID (MeshTunnel)
390 static struct GNUNET_CONTAINER_MultiHashMap *tunnels;
393 * Peers known, indexed by PeerIdentity (MeshPeerInfo)
395 static struct GNUNET_CONTAINER_MultiHashMap *peers;
398 * Handle to communicate with core
400 static struct GNUNET_CORE_Handle *core_handle;
405 static struct GNUNET_DHT_Handle *dht_handle;
410 static struct GNUNET_SERVER_Handle *server_handle;
413 * Notification context, to send messages to local clients
415 static struct GNUNET_SERVER_NotificationContext *nc;
418 * Local peer own ID (memory efficient handle)
420 static GNUNET_PEER_Id myid;
423 * Local peer own ID (full value)
425 static struct GNUNET_PeerIdentity my_full_id;
430 static struct GNUNET_CRYPTO_RsaPrivateKey* my_private_key;
435 static struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded my_public_key;
438 * Tunnel ID for the next created tunnel (global tunnel number)
440 static MESH_TunnelNumber next_tid;
443 * All application types provided by this peer
445 static struct GNUNET_CONTAINER_MultiHashMap *applications;
448 * All message types clients of this peer are interested in
450 static struct GNUNET_CONTAINER_MultiHashMap *types;
453 * Task to periodically announce provided applications
455 GNUNET_SCHEDULER_TaskIdentifier announce_applications_task;
458 * Task to periodically announce itself in the network
460 GNUNET_SCHEDULER_TaskIdentifier announce_id_task;
463 unsigned int next_client_id;
467 /******************************************************************************/
468 /************************ ITERATORS ****************************/
469 /******************************************************************************/
473 * Iterator over hash map peer entries collect all neighbors who to resend the
476 * @param cls closure (**GNUNET_PEER_Id to store hops to send packet)
477 * @param key current key code (peer id hash)
478 * @param value value in the hash map (peer_info)
479 * @return GNUNET_YES if we should continue to iterate, GNUNET_NO if not.
482 iterate_collect_neighbors (void *cls, const GNUNET_HashCode * key, void *value)
484 struct MeshPeerInfo *peer_info = value;
485 struct MeshPathInfo *neighbors = cls;
486 struct GNUNET_PeerIdentity *id;
487 GNUNET_PEER_Id peer_id;
490 if (peer_info->id == myid)
494 id = path_get_first_hop (neighbors->t->tree, peer_info->id);
495 peer_id = GNUNET_PEER_search(id);
496 for (i = 0; i < neighbors->path->length; i++)
498 if (neighbors->path->peers[i] == peer_id)
501 GNUNET_array_append (neighbors->path->peers, neighbors->path->length,
508 /******************************************************************************/
509 /************************ PERIODIC FUNCTIONS ****************************/
510 /******************************************************************************/
513 * Announce iterator over for each application provided by the peer
516 * @param key current key code
517 * @param value value in the hash map
518 * @return GNUNET_YES if we should continue to
523 announce_application (void *cls, const GNUNET_HashCode * key, void *value)
525 /* FIXME are hashes in multihash map equal on all aquitectures? */
526 GNUNET_DHT_put (dht_handle, key, 10U, GNUNET_DHT_RO_RECORD_ROUTE,
527 GNUNET_BLOCK_TYPE_TEST, sizeof (struct GNUNET_PeerIdentity),
528 (const char *) &my_full_id,
530 GNUNET_TIME_UNIT_FOREVER_ABS, GNUNET_TIME_UNIT_FOREVER_REL,
531 &mesh_debug, "DHT_put for app completed");
533 GNUNET_TIME_absolute_add (GNUNET_TIME_absolute_get (),
535 APP_ANNOUNCE_TIME, NULL, NULL);
542 * Periodically announce what applications are provided by local clients
545 * @param tc task context
548 announce_applications (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
550 if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN)
552 announce_applications_task = GNUNET_SCHEDULER_NO_TASK;
555 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Starting PUT for apps\n");
556 GNUNET_CONTAINER_multihashmap_iterate (applications, &announce_application,
558 announce_applications_task =
559 GNUNET_SCHEDULER_add_delayed (APP_ANNOUNCE_TIME, &announce_applications,
561 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Finished PUT for apps\n");
567 * Periodically announce self id in the DHT
570 * @param tc task context
573 announce_id (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
575 if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN)
577 announce_id_task = GNUNET_SCHEDULER_NO_TASK;
581 * - Set data expiration in function of X
584 GNUNET_DHT_put (dht_handle, /* DHT handle */
585 &my_full_id.hashPubKey, /* Key to use */
586 10U, /* Replication level */
587 GNUNET_DHT_RO_RECORD_ROUTE, /* DHT options */
588 GNUNET_BLOCK_TYPE_TEST, /* Block type */
589 0, /* Size of the data */
590 NULL, /* Data itself */
591 GNUNET_TIME_absolute_get_forever (), /* Data expiration */
592 GNUNET_TIME_UNIT_FOREVER_REL, /* Retry time */
594 &mesh_debug, "DHT_put for id completed");
596 NULL, /* Continuation */
597 NULL); /* Continuation closure */
600 GNUNET_SCHEDULER_add_delayed (ID_ANNOUNCE_TIME, &announce_id, cls);
605 * Function to process paths received for a new peer addition. The recorded
606 * paths form the initial tunnel, which can be optimized later.
607 * Called on each result obtained for the DHT search.
610 * @param exp when will this value expire
611 * @param key key of the result
612 * @param get_path NULL-terminated array of pointers
613 * to the peers on reverse GET path (or NULL if not recorded)
614 * @param put_path NULL-terminated array of pointers
615 * to the peers on the PUT path (or NULL if not recorded)
616 * @param type type of the result
617 * @param size number of bytes in data
618 * @param data pointer to the result data
621 dht_get_id_handler (void *cls, struct GNUNET_TIME_Absolute exp,
622 const GNUNET_HashCode * key,
623 const struct GNUNET_PeerIdentity *const *get_path,
624 const struct GNUNET_PeerIdentity *const *put_path,
625 enum GNUNET_BLOCK_Type type, size_t size, const void *data);
628 /******************************************************************************/
629 /****************** GENERAL HELPER FUNCTIONS ************************/
630 /******************************************************************************/
633 * Retrieve the MeshPeerInfo stucture associated with the peer, create one
634 * and insert it in the appropiate structures if the peer is not known yet.
636 * @param peer Identity of the peer
638 * @return Existing or newly created peer info
640 static struct MeshPeerInfo *
641 peer_info_get (const struct GNUNET_PeerIdentity *peer)
643 struct MeshPeerInfo *peer_info;
645 peer_info = GNUNET_CONTAINER_multihashmap_get (peers, &peer->hashPubKey);
646 if (NULL == peer_info)
649 (struct MeshPeerInfo *) GNUNET_malloc (sizeof (struct MeshPeerInfo));
650 GNUNET_CONTAINER_multihashmap_put (peers, &peer->hashPubKey, peer_info,
651 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
652 peer_info->id = GNUNET_PEER_intern (peer);
661 * Destroy the peer_info and free any allocated resources linked to it
662 * @param t tunnel the path belongs to
663 * @param pi the peer_info to destroy
664 * @return GNUNET_OK on success
667 peer_info_destroy (struct MeshPeerInfo *pi)
669 GNUNET_HashCode hash;
670 struct GNUNET_PeerIdentity id;
672 GNUNET_PEER_resolve (pi->id, &id);
673 GNUNET_PEER_change_rc (pi->id, -1);
674 GNUNET_CRYPTO_hash (&id, sizeof (struct GNUNET_PeerIdentity), &hash);
676 GNUNET_CONTAINER_multihashmap_remove (peers, &hash, pi);
677 GNUNET_SCHEDULER_cancel (pi->path_refresh_task);
685 * Notify a tunnel that a connection has broken that affects at least
688 * @param t Tunnel affected.
689 * @param peer Peer that (at least) has been affected by the disconnection.
690 * @param p1 Peer that got disconnected from p2.
691 * @param p2 Peer that got disconnected from p1.
693 * @return Short ID of the peer disconnected (either p1 or p2).
694 * 0 if the tunnel remained unaffected.
696 static GNUNET_PEER_Id
697 tunnel_notify_connection_broken (struct MeshTunnel *t,
698 struct MeshPeerInfo *peer, GNUNET_PEER_Id p1,
702 * Remove all paths that rely on a direct connection between p1 and p2
703 * from the peer itself and notify all tunnels about it.
705 * @param peer PeerInfo of affected peer.
706 * @param p1 GNUNET_PEER_Id of one peer.
707 * @param p2 GNUNET_PEER_Id of another peer that was connected to the first and
710 * TODO: optimize (see below)
713 path_remove_from_peer (struct MeshPeerInfo *peer,
717 struct GNUNET_PeerIdentity id;
718 struct MeshPeerPath *p;
719 struct MeshPeerPath *aux;
720 struct MeshPeerInfo *peer_d;
722 unsigned int destroyed;
732 for (i = 0; i < (p->length - 1); i++)
734 if ((p->peers[i] == p1 && p->peers[i + 1] == p2) ||
735 (p->peers[i] == p2 && p->peers[i + 1] == p1))
747 for (i = 0; i < peer->ntunnels; i++)
749 d = tunnel_notify_connection_broken (peer->tunnels[i], peer, p1, p2);
751 * Problem: one or more peers have been deleted from the tunnel tree.
752 * We don't know who they are to try to add them again.
753 * We need to try to find a new path for each of the disconnected peers.
754 * Some of them might already have a path to reach them that does not
755 * involve p1 and p2. Adding all anew might render in a better tree than
756 * the trivial immediate fix.
758 * Trivial immiediate fix: try to reconnect to the disconnected node. All
759 * its children will be reachable trough him.
761 GNUNET_PEER_resolve(d, &id);
762 peer_d = peer_info_get(&id);
765 for (p = peer_d->path_head; NULL != p; p = p->next)
767 if ((cost = path_get_cost(peer->tunnels[i]->tree, p)) < best)
775 /* No callback, as peer will be already disconnected */
776 tree_add_path(peer->tunnels[i]->tree, aux, NULL);
780 struct MeshPathInfo *path_info;
782 if (NULL != peer_d->dhtget)
784 path_info = GNUNET_malloc(sizeof(struct MeshPathInfo));
786 path_info->peer = peer_d;
787 path_info->t = peer->tunnels[i];
788 peer_d->dhtget = GNUNET_DHT_get_start(dht_handle, /* handle */
789 GNUNET_TIME_UNIT_FOREVER_REL, /* timeout */
790 GNUNET_BLOCK_TYPE_TEST, /* type */
791 &id.hashPubKey, /*key to search */
792 4, /* replication level */
793 GNUNET_DHT_RO_RECORD_ROUTE,
794 NULL, /* bloom filter */
806 * Add the path to the peer and update the path used to reach it in case this
809 * @param peer_info Destination peer to add the path to.
810 * @param path New path to add. Last peer must be the peer in arg 1.
811 * Path will be either used of freed if already known.
813 * TODO: trim the part from origin to us? Add it as path to origin?
816 path_add_to_peer (struct MeshPeerInfo *peer_info, struct MeshPeerPath *path)
818 struct MeshPeerPath *aux;
822 if (NULL == peer_info || NULL == path)
828 l = path_get_length (path);
830 for (aux = peer_info->path_head; aux != NULL; aux = aux->next)
832 l2 = path_get_length (aux);
835 GNUNET_CONTAINER_DLL_insert_before (peer_info->path_head,
836 peer_info->path_tail, aux, path);
840 if (l2 == l && memcmp(path->peers, aux->peers, l) == 0)
847 GNUNET_CONTAINER_DLL_insert_tail (peer_info->path_head, peer_info->path_tail,
854 * Add the path to the origin peer and update the path used to reach it in case
855 * this is the shortest.
856 * The path is given in peer_info -> destination, therefore we turn the path
859 * @param peer_info Peer to add the path to, being the origin of the path.
860 * @param path New path to add after being inversed.
863 path_add_to_origin (struct MeshPeerInfo *peer_info, struct MeshPeerPath *path)
866 path_add_to_peer (peer_info, path);
871 * Build a PeerPath from the paths returned from the DHT, reversing the paths
872 * to obtain a local peer -> destination path and interning the peer ids.
874 * @param get_path NULL-terminated array of pointers
875 * to the peers on reverse GET path (or NULL if not recorded)
876 * @param put_path NULL-terminated array of pointers
877 * to the peers on the PUT path (or NULL if not recorded)
879 * @return Newly allocated and created path
881 static struct MeshPeerPath *
882 path_build_from_dht (const struct GNUNET_PeerIdentity *const *get_path,
883 const struct GNUNET_PeerIdentity *const *put_path)
885 struct MeshPeerPath *p;
890 for (i = 0; get_path[i] != NULL; i++) ;
891 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "MESH: GET has %d hops.\n", i);
892 for (i--; i >= 0; i--)
894 id = GNUNET_PEER_intern (get_path[i]);
895 if (p->length > 0 && id == p->peers[p->length - 1])
897 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "MESH: Optimizing 1 hop out.\n");
898 GNUNET_PEER_change_rc(id, -1);
903 GNUNET_realloc (p->peers, sizeof (GNUNET_PEER_Id) * (p->length + 1));
904 p->peers[p->length] = id;
908 for (i = 0; put_path[i] != NULL; i++) ;
909 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "MESH: PUT has %d hops.\n", i);
910 for (i--; i >= 0; i--)
912 id = GNUNET_PEER_intern (put_path[i]);
913 if (p->length > 0 && id == p->peers[p->length - 1])
915 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "MESH: Optimizing 1 hop out.\n");
916 GNUNET_PEER_change_rc(id, -1);
921 GNUNET_realloc (p->peers, sizeof (GNUNET_PEER_Id) * (p->length + 1));
922 p->peers[p->length] = id;
927 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
928 "MESH: (first of GET: %s)\n",
929 GNUNET_h2s_full(&get_path[0]->hashPubKey));
930 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
931 "MESH: (first of PUT: %s)\n",
932 GNUNET_h2s_full(&put_path[0]->hashPubKey));
933 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
934 "MESH: In total: %d hops\n",
942 * Send keepalive packets for a peer
950 path_refresh (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
952 struct MeshTunnel *t = cls;
954 // struct GNUNET_PeerIdentity id;
956 if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN)
960 /* FIXME implement multicast keepalive. Just an empty multicast packet? */
961 // GNUNET_PEER_resolve (path_get_first_hop (path->t, path->peer)->id, &id);
962 // GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0,
963 // GNUNET_TIME_UNIT_FOREVER_REL, &id,
964 // sizeof (struct GNUNET_MESH_ManipulatePath)
966 // (path->path->length *
967 // sizeof (struct GNUNET_PeerIdentity)),
968 // &send_core_create_path,
970 t->path_refresh_task =
971 GNUNET_SCHEDULER_add_delayed (t->tree->refresh, &path_refresh, t);
977 * Check if client has registered with the service and has not disconnected
979 * @param client the client to check
981 * @return non-NULL if client exists in the global DLL
983 static struct MeshClient *
984 client_get (struct GNUNET_SERVER_Client *client)
986 struct MeshClient *c;
991 if (c->handle == client)
1000 * Checks if a given client has subscribed to certain message type
1002 * @param message_type Type of message to check
1003 * @param c Client to check
1005 * @return GNUNET_YES or GNUNET_NO, depending on subscription status
1010 client_is_subscribed (uint16_t message_type, struct MeshClient *c)
1014 GNUNET_CRYPTO_hash (&message_type, sizeof (uint16_t), &hc);
1015 return GNUNET_CONTAINER_multihashmap_contains (c->types, &hc);
1020 * Search for a tunnel among the tunnels for a client
1022 * @param c the client whose tunnels to search in
1023 * @param tid the local id of the tunnel
1025 * @return tunnel handler, NULL if doesn't exist
1027 static struct MeshTunnel *
1028 tunnel_get_by_local_id (struct MeshClient *c, MESH_TunnelNumber tid)
1030 GNUNET_HashCode hash;
1032 GNUNET_CRYPTO_hash (&tid, sizeof (MESH_TunnelNumber), &hash);
1033 return GNUNET_CONTAINER_multihashmap_get (c->tunnels, &hash);
1038 * Search for a tunnel by global ID using PEER_ID
1040 * @param pi owner of the tunnel
1041 * @param tid global tunnel number
1043 * @return tunnel handler, NULL if doesn't exist
1045 static struct MeshTunnel *
1046 tunnel_get_by_pi (GNUNET_PEER_Id pi, MESH_TunnelNumber tid)
1048 struct MESH_TunnelID id;
1049 GNUNET_HashCode hash;
1054 GNUNET_CRYPTO_hash (&id, sizeof (struct MESH_TunnelID), &hash);
1055 return GNUNET_CONTAINER_multihashmap_get (tunnels, &hash);
1060 * Search for a tunnel by global ID using full PeerIdentities
1062 * @param oid owner of the tunnel
1063 * @param tid global tunnel number
1065 * @return tunnel handler, NULL if doesn't exist
1067 static struct MeshTunnel *
1068 tunnel_get (struct GNUNET_PeerIdentity *oid, MESH_TunnelNumber tid)
1070 return tunnel_get_by_pi (GNUNET_PEER_search (oid), tid);
1075 * Callback used to notify a client owner of a tunnel that a peer has
1076 * disconnected, most likely because of a path change.
1078 * @param n Node in the tree representing the disconnected peer
1081 notify_peer_disconnected (const struct MeshTunnelTreeNode *n)
1083 struct GNUNET_MESH_PeerControl msg;
1085 if (NULL == n->t->client || NULL == nc)
1088 msg.header.size = htons (sizeof (msg));
1089 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_DEL);
1090 msg.tunnel_id = htonl (n->t->local_tid);
1091 GNUNET_PEER_resolve (n->peer, &msg.peer);
1092 GNUNET_SERVER_notification_context_unicast (nc, n->t->client->handle,
1093 &msg.header, GNUNET_NO);
1098 * Add a peer to a tunnel, accomodating paths accordingly and initializing all
1099 * needed rescources.
1101 * @param t Tunnel we want to add a new peer to
1102 * @param peer PeerInfo of the peer being added
1106 tunnel_add_peer (struct MeshTunnel *t, struct MeshPeerInfo *peer)
1108 struct MeshPeerPath *p;
1109 struct MeshPeerPath *best_p;
1110 unsigned int best_cost;
1113 GNUNET_array_append (peer->tunnels, peer->ntunnels, t);
1114 if (NULL == (p = peer->path_head))
1118 best_cost = UINT_MAX;
1121 if ((cost = path_get_cost (t->tree, p)) < best_cost)
1128 tree_add_path (t->tree, best_p, ¬ify_peer_disconnected);
1129 if (GNUNET_SCHEDULER_NO_TASK == t->path_refresh_task)
1130 t->path_refresh_task =
1131 GNUNET_SCHEDULER_add_delayed (t->tree->refresh, &path_refresh, t);
1136 * Notify a tunnel that a connection has broken that affects at least
1137 * some of its peers.
1139 * @param t Tunnel affected.
1140 * @param peer Peer that (at least) has been affected by the disconnection.
1141 * @param p1 Peer that got disconnected from p2.
1142 * @param p2 Peer that got disconnected from p1.
1144 * @return Short ID of the peer disconnected (either p1 or p2).
1145 * 0 if the tunnel remained unaffected.
1147 static GNUNET_PEER_Id
1148 tunnel_notify_connection_broken (struct MeshTunnel *t,
1149 struct MeshPeerInfo *peer,
1153 return tree_notify_connection_broken (t->tree, p1, p2,
1154 ¬ify_peer_disconnected);
1159 * Destroy the tunnel and free any allocated resources linked to it
1161 * @param t the tunnel to destroy
1163 * @return GNUNET_OK on success
1166 tunnel_destroy (struct MeshTunnel *t)
1168 struct MeshClient *c;
1169 struct MeshQueue *q;
1170 struct MeshQueue *qn;
1171 GNUNET_HashCode hash;
1174 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: DESTROYING TUNNEL at %p\n", t);
1180 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: by client %u\n", c->id);
1183 GNUNET_CRYPTO_hash (&t->id, sizeof (struct MESH_TunnelID), &hash);
1184 if (GNUNET_YES != GNUNET_CONTAINER_multihashmap_remove (tunnels, &hash, t))
1189 GNUNET_CRYPTO_hash (&t->local_tid, sizeof (MESH_TunnelNumber), &hash);
1190 if (GNUNET_YES != GNUNET_CONTAINER_multihashmap_remove (c->tunnels, &hash, t))
1194 GNUNET_CONTAINER_multihashmap_destroy (t->peers);
1198 if (NULL != q->data)
1199 GNUNET_free (q->data);
1203 /* TODO cancel core transmit ready in case it was active */
1205 tree_destroy(t->tree);
1212 * tunnel_destroy_iterator: iterator for deleting each tunnel that belongs to a
1213 * client when the client disconnects.
1215 * @param cls closure (client that is disconnecting)
1216 * @param key the hash of the local tunnel id (used to access the hashmap)
1217 * @param value the value stored at the key (tunnel to destroy)
1219 * @return GNUNET_OK on success
1222 tunnel_destroy_iterator (void *cls, const GNUNET_HashCode * key, void *value)
1226 r = tunnel_destroy ((struct MeshTunnel *) value);
1231 /******************************************************************************/
1232 /**************** MESH NETWORK HANDLER HELPERS ***********************/
1233 /******************************************************************************/
1237 * Function called to notify a client about the socket
1238 * being ready to queue more data. "buf" will be
1239 * NULL and "size" zero if the socket was closed for
1240 * writing in the meantime.
1242 * @param cls closure
1243 * @param size number of bytes available in buf
1244 * @param buf where the callee should write the message
1245 * @return number of bytes written to buf
1248 send_core_create_path (void *cls, size_t size, void *buf)
1250 struct MeshPathInfo *info = cls;
1251 struct GNUNET_MESH_ManipulatePath *msg;
1252 struct GNUNET_PeerIdentity *peer_ptr;
1253 struct MeshPeerInfo *peer = info->peer;
1254 struct MeshTunnel *t = info->t;
1255 struct MeshPeerPath *p = info->path;
1260 sizeof (struct GNUNET_MESH_ManipulatePath) +
1261 p->length * sizeof (struct GNUNET_PeerIdentity);
1263 if (size < size_needed || NULL == buf)
1265 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Retransmitting create path\n");
1266 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0,
1267 GNUNET_TIME_UNIT_FOREVER_REL,
1268 path_get_first_hop (t->tree, peer->id),
1269 size_needed, &send_core_create_path,
1274 msg = (struct GNUNET_MESH_ManipulatePath *) buf;
1275 msg->header.size = htons (size_needed);
1276 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE);
1277 msg->tid = ntohl (t->id.tid);
1279 peer_ptr = (struct GNUNET_PeerIdentity *) &msg[1];
1280 for (i = 0; i < p->length; i++)
1282 GNUNET_PEER_resolve (p->peers[i], peer_ptr++);
1294 * Function called to notify a client about the socket
1295 * being ready to queue more data. "buf" will be
1296 * NULL and "size" zero if the socket was closed for
1297 * writing in the meantime.
1299 * @param cls closure (MeshDataDescriptor with all info to build packet)
1300 * @param size number of bytes available in buf
1301 * @param buf where the callee should write the message
1302 * @return number of bytes written to buf
1305 send_core_data_to_origin (void *cls, size_t size, void *buf)
1307 struct MeshDataDescriptor *info = cls;
1308 struct GNUNET_MESH_ToOrigin *msg = buf;
1311 GNUNET_assert (NULL != info);
1312 total_size = sizeof (struct GNUNET_MESH_ToOrigin) + info->size;
1313 GNUNET_assert (total_size < 65536); /* UNIT16_MAX */
1315 if (total_size > size)
1317 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1318 "not enough buffer to send data to origin\n");
1321 msg->header.size = htons (total_size);
1322 msg->header.type = htons (GNUNET_MESSAGE_TYPE_DATA_MESSAGE_TO_ORIGIN);
1323 GNUNET_PEER_resolve (info->origin->oid, &msg->oid);
1324 msg->tid = htonl (info->origin->tid);
1325 if (0 != info->size)
1327 memcpy (&msg[1], &info[1], info->size);
1329 if (NULL != info->client)
1331 GNUNET_SERVER_receive_done (info->client, GNUNET_OK);
1339 * Function called to notify a client about the socket
1340 * being ready to queue more data. "buf" will be
1341 * NULL and "size" zero if the socket was closed for
1342 * writing in the meantime.
1344 * @param cls closure (data itself)
1345 * @param size number of bytes available in buf
1346 * @param buf where the callee should write the message
1347 * @return number of bytes written to buf
1350 send_core_data_unicast (void *cls, size_t size, void *buf)
1352 struct MeshDataDescriptor *info = cls;
1353 struct GNUNET_MESH_Unicast *msg = buf;
1356 GNUNET_assert (NULL != info);
1357 total_size = sizeof (struct GNUNET_MESH_Unicast) + info->size;
1358 GNUNET_assert (total_size < 65536); /* UNIT16_MAX */
1360 if (total_size > size)
1362 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1363 "not enough buffer to send data to peer\n");
1366 msg->header.size = htons (total_size);
1367 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_UNICAST);
1368 GNUNET_PEER_resolve (info->origin->oid, &msg->oid);
1369 GNUNET_PEER_resolve (info->destination, &msg->destination);
1370 msg->tid = htonl (info->origin->tid);
1371 if (0 != info->size)
1373 memcpy (&msg[1], &info[1], info->size);
1375 if (NULL != info->client)
1377 GNUNET_SERVER_receive_done (info->client, GNUNET_OK);
1385 * Function called to notify a client about the socket
1386 * being ready to queue more data. "buf" will be
1387 * NULL and "size" zero if the socket was closed for
1388 * writing in the meantime.
1390 * @param cls closure (data itself)
1391 * @param size number of bytes available in buf
1392 * @param buf where the callee should write the message
1393 * @return number of bytes written to buf
1396 send_core_data_multicast (void *cls, size_t size, void *buf)
1398 struct MeshDataDescriptor *info = cls;
1399 struct GNUNET_MESH_Multicast *msg = buf;
1402 GNUNET_assert (NULL != info);
1403 total_size = info->size + sizeof (struct GNUNET_MESH_Multicast);
1404 GNUNET_assert (total_size < GNUNET_SERVER_MAX_MESSAGE_SIZE);
1408 info->peer->core_transmit[info->handler_n] = NULL;
1410 if (total_size > size)
1412 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1413 "not enough buffer to send data futher\n");
1416 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_MULTICAST);
1417 msg->header.size = htons (total_size);
1418 GNUNET_PEER_resolve (info->origin->oid, &msg->oid);
1419 msg->tid = htonl (info->origin->tid);
1420 memcpy (&msg[1], &info[1], total_size);
1421 if (0 == --info->copies)
1423 if (NULL != info->client)
1425 GNUNET_SERVER_receive_done (info->client, GNUNET_OK);
1434 * Function called to notify a client about the socket
1435 * being ready to queue more data. "buf" will be
1436 * NULL and "size" zero if the socket was closed for
1437 * writing in the meantime.
1439 * @param cls closure (MeshDataDescriptor)
1440 * @param size number of bytes available in buf
1441 * @param buf where the callee should write the message
1442 * @return number of bytes written to buf
1445 send_core_path_ack (void *cls, size_t size, void *buf)
1447 struct MeshDataDescriptor *info = cls;
1448 struct GNUNET_MESH_PathACK *msg = buf;
1450 GNUNET_assert (NULL != info);
1453 info->peer->core_transmit[info->handler_n] = NULL;
1455 if (sizeof (struct GNUNET_MESH_PathACK) > size)
1460 msg->header.size = htons (sizeof (struct GNUNET_MESH_PathACK));
1461 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_ACK);
1462 GNUNET_PEER_resolve (info->origin->oid, &msg->oid);
1463 msg->tid = htonl (info->origin->tid);
1464 msg->peer_id = my_full_id;
1466 /* TODO add signature */
1468 return sizeof (struct GNUNET_MESH_PathACK);
1473 * Function called to notify a client about the socket
1474 * being ready to queue more data. "buf" will be
1475 * NULL and "size" zero if the socket was closed for
1476 * writing in the meantime.
1478 * @param cls closure (data itself)
1479 * @param size number of bytes available in buf
1480 * @param buf where the callee should write the message
1481 * @return number of bytes written to buf
1484 send_core_data_raw (void *cls, size_t size, void *buf)
1486 struct GNUNET_MessageHeader *msg = cls;
1489 GNUNET_assert (NULL != msg);
1490 total_size = ntohs (msg->size);
1492 if (total_size > size)
1497 memcpy (buf, msg, total_size);
1505 * Send another peer a notification to destroy a tunnel
1506 * @param cls The tunnel to destroy
1507 * @param size Size in the buffer
1508 * @param buf Memory where to put the data to transmit
1509 * @return Size of data put in buffer
1512 send_p2p_tunnel_destroy (void *cls, size_t size, void *buf)
1514 struct MeshTunnel *t = cls;
1515 struct MeshClient *c;
1516 struct GNUNET_MESH_TunnelMessage *msg;
1520 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY);
1521 /*FIXME*/ msg->header.size =
1522 htons (sizeof (struct GNUNET_MESH_TunnelMessage));
1523 msg->tunnel_id = htonl (t->id.tid);
1525 tunnel_destroy (c, t);
1526 return sizeof (struct GNUNET_MESH_TunnelMessage);
1532 * Send the message to all clients that have subscribed to its type
1534 * @param msg Pointer to the message itself
1535 * @return number of clients this message was sent to
1538 send_subscribed_clients (struct GNUNET_MessageHeader *msg)
1540 struct MeshClient *c;
1544 type = ntohs (msg->type);
1545 for (count = 0, c = clients; c != NULL; c = c->next)
1547 if (client_is_subscribed (type, c))
1550 GNUNET_SERVER_notification_context_unicast (nc, c->handle, msg,
1560 * Notify the client that owns the tunnel that a peer has connected to it
1562 * @param t Tunnel whose owner to notify
1563 * @param id Short id of the peer that has connected
1566 send_client_peer_connected (const struct MeshTunnel *t, const GNUNET_PEER_Id id)
1568 struct GNUNET_MESH_PeerControl pc;
1570 pc.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD);
1571 pc.header.size = htons (sizeof (struct GNUNET_MESH_PeerControl));
1572 pc.tunnel_id = htonl (t->local_tid);
1573 GNUNET_PEER_resolve (id, &pc.peer);
1574 GNUNET_SERVER_notification_context_unicast (nc, t->client->handle,
1575 &pc.header, GNUNET_NO);
1579 /******************************************************************************/
1580 /******************** MESH NETWORK HANDLERS **************************/
1581 /******************************************************************************/
1585 * Core handler for path creation
1586 * struct GNUNET_CORE_MessageHandler
1588 * @param cls closure
1589 * @param message message
1590 * @param peer peer identity this notification is about
1591 * @param atsi performance data
1592 * @return GNUNET_OK to keep the connection open,
1593 * GNUNET_SYSERR to close it (signal serious error)
1597 handle_mesh_path_create (void *cls, const struct GNUNET_PeerIdentity *peer,
1598 const struct GNUNET_MessageHeader *message,
1599 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
1601 unsigned int own_pos;
1604 MESH_TunnelNumber tid;
1605 struct GNUNET_MESH_ManipulatePath *msg;
1606 struct GNUNET_PeerIdentity *pi;
1607 struct GNUNET_PeerIdentity id;
1608 GNUNET_HashCode hash;
1609 struct MeshPeerPath *path;
1610 struct MeshPeerInfo *dest_peer_info;
1611 struct MeshPeerInfo *orig_peer_info;
1612 struct MeshTunnel *t;
1614 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1615 "MESH: Received a MESH path create msg\n");
1616 size = ntohs (message->size);
1617 if (size < sizeof (struct GNUNET_MESH_ManipulatePath))
1619 GNUNET_break_op (0);
1623 size -= sizeof (struct GNUNET_MESH_ManipulatePath);
1624 if (size % sizeof (struct GNUNET_PeerIdentity))
1626 GNUNET_break_op (0);
1629 size /= sizeof (struct GNUNET_PeerIdentity);
1632 GNUNET_break_op (0);
1635 msg = (struct GNUNET_MESH_ManipulatePath *) message;
1637 tid = ntohl (msg->tid);
1638 pi = (struct GNUNET_PeerIdentity *) &msg[1];
1639 t = tunnel_get (pi, tid);
1643 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Creating tunnel\n");
1644 t = GNUNET_malloc (sizeof (struct MeshTunnel));
1645 t->id.oid = GNUNET_PEER_intern (pi);
1647 t->peers = GNUNET_CONTAINER_multihashmap_create (32);
1649 GNUNET_CRYPTO_hash (&t->id, sizeof (struct MESH_TunnelID), &hash);
1651 GNUNET_CONTAINER_multihashmap_put (tunnels, &hash, t,
1652 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
1660 GNUNET_CONTAINER_multihashmap_get (peers, &pi[size - 1].hashPubKey);
1661 if (NULL == dest_peer_info)
1663 dest_peer_info = GNUNET_malloc (sizeof (struct MeshPeerInfo));
1664 dest_peer_info->id = GNUNET_PEER_intern (&pi[size - 1]);
1665 GNUNET_CONTAINER_multihashmap_put (peers, &pi[size - 1].hashPubKey,
1667 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
1669 orig_peer_info = GNUNET_CONTAINER_multihashmap_get (peers, &pi->hashPubKey);
1670 if (NULL == orig_peer_info)
1672 orig_peer_info = GNUNET_malloc (sizeof (struct MeshPeerInfo));
1673 orig_peer_info->id = GNUNET_PEER_intern (pi);
1674 GNUNET_CONTAINER_multihashmap_put (peers, &pi->hashPubKey, orig_peer_info,
1675 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
1678 path = path_new (size);
1680 for (i = 0; i < size; i++)
1682 path->peers[i] = GNUNET_PEER_intern (&pi[i]);
1683 if (path->peers[i] == myid)
1687 { /* cannot be self, must be 'not found' */
1688 /* create path: self not found in path through self */
1689 GNUNET_break_op (0);
1690 path_destroy (path);
1691 /* FIXME error. destroy tunnel? leave for timeout? */
1694 if (own_pos == size - 1)
1696 /* It is for us! Send ack. */
1697 struct MeshDataDescriptor *info;
1700 path_add_to_origin (orig_peer_info, path); /* inverts path! */
1701 info = GNUNET_malloc (sizeof (struct MeshDataDescriptor));
1702 info->origin = &t->id;
1703 info->peer = GNUNET_CONTAINER_multihashmap_get (peers, &id.hashPubKey);
1704 GNUNET_assert (info->peer);
1705 for (j = 0; info->peer->core_transmit[j]; j++)
1713 info->handler_n = j;
1714 info->peer->core_transmit[j] =
1715 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 100,
1716 GNUNET_TIME_UNIT_FOREVER_REL, peer,
1717 sizeof (struct GNUNET_MessageHeader),
1718 &send_core_path_ack, info);
1722 /* It's for somebody else! Retransmit. */
1723 struct MeshPathInfo *path_info;
1725 path_info = GNUNET_malloc (sizeof (struct MeshPathInfo));
1727 path_info->path = path;
1728 path_info->peer = dest_peer_info;
1730 path_add_to_peer (dest_peer_info, path);
1731 GNUNET_PEER_resolve (path->peers[own_pos + 1], &id);
1732 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0,
1733 GNUNET_TIME_UNIT_FOREVER_REL, &id,
1734 sizeof (struct GNUNET_MessageHeader),
1735 &send_core_create_path, path_info);
1742 * Core handler for mesh network traffic going from the origin to a peer
1744 * @param cls closure
1745 * @param peer peer identity this notification is about
1746 * @param message message
1747 * @param atsi performance data
1748 * @return GNUNET_OK to keep the connection open,
1749 * GNUNET_SYSERR to close it (signal serious error)
1752 handle_mesh_data_unicast (void *cls, const struct GNUNET_PeerIdentity *peer,
1753 const struct GNUNET_MessageHeader *message,
1754 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
1756 struct GNUNET_MESH_Unicast *msg;
1757 struct MeshTunnel *t;
1758 struct MeshPeerInfo *pi;
1761 size = ntohs (message->size);
1763 sizeof (struct GNUNET_MESH_Unicast) +
1764 sizeof (struct GNUNET_MessageHeader))
1769 msg = (struct GNUNET_MESH_Unicast *) message;
1770 t = tunnel_get (&msg->oid, ntohl (msg->tid));
1773 /* TODO notify back: we don't know this tunnel */
1776 pi = GNUNET_CONTAINER_multihashmap_get (t->peers,
1777 &msg->destination.hashPubKey);
1780 /* TODO maybe feedback, log to statistics */
1785 send_subscribed_clients ((struct GNUNET_MessageHeader *) &msg[1]);
1788 msg = GNUNET_malloc (size);
1789 memcpy (msg, message, size);
1790 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0,
1791 GNUNET_TIME_UNIT_FOREVER_REL,
1792 path_get_first_hop (t->tree, pi->id),
1794 &send_core_data_raw, msg);
1800 * Core handler for mesh network traffic going from the origin to all peers
1802 * @param cls closure
1803 * @param message message
1804 * @param peer peer identity this notification is about
1805 * @param atsi performance data
1806 * @return GNUNET_OK to keep the connection open,
1807 * GNUNET_SYSERR to close it (signal serious error)
1810 handle_mesh_data_multicast (void *cls, const struct GNUNET_PeerIdentity *peer,
1811 const struct GNUNET_MessageHeader *message,
1812 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
1814 struct GNUNET_MESH_Multicast *msg;
1815 struct GNUNET_PeerIdentity id;
1816 struct MeshDataDescriptor *info;
1817 struct MeshPathInfo neighbors;
1818 struct MeshTunnel *t;
1824 size = ntohs (message->size);
1826 sizeof (struct GNUNET_MESH_Multicast) +
1827 sizeof (struct GNUNET_MessageHeader))
1829 GNUNET_break_op (0);
1832 msg = (struct GNUNET_MESH_Multicast *) message;
1833 t = tunnel_get (&msg->oid, ntohl (msg->tid));
1837 /* TODO notify that we dont know that tunnel */
1841 /* Transmit to locally interested clients */
1842 if (GNUNET_CONTAINER_multihashmap_contains (t->peers, &my_full_id.hashPubKey))
1844 send_subscribed_clients ((struct GNUNET_MessageHeader *) &msg[1]);
1847 /* Retransmit to other peers.
1848 * Using path here as just a collection of peers, not a path per se.
1851 neighbors.path = path_new (0);
1852 GNUNET_CONTAINER_multihashmap_iterate (t->peers, &iterate_collect_neighbors,
1854 if (0 == neighbors.path->length)
1856 GNUNET_free (neighbors.path);
1859 size -= sizeof (struct GNUNET_MESH_Multicast);
1860 info = GNUNET_malloc (sizeof (struct MeshDataDescriptor) + size);
1861 info->origin = &t->id;
1862 info->copies = neighbors.path->length;
1863 for (i = 0; i < info->copies; i++)
1865 GNUNET_PEER_resolve (neighbors.path->peers[i], &id);
1866 info->peer = GNUNET_CONTAINER_multihashmap_get (peers, &id.hashPubKey);
1867 GNUNET_assert (NULL != info->peer);
1868 for (j = 0; 0 != info->peer->core_transmit[j]; j++)
1870 if (j == (CORE_QUEUE_SIZE - 1))
1876 info->handler_n = j;
1877 info->peer->infos[j] = info;
1878 info->peer->core_transmit[j] =
1879 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0,
1880 GNUNET_TIME_UNIT_FOREVER_REL, &id,
1881 ntohs (msg->header.size),
1882 &send_core_data_multicast, info);
1884 GNUNET_free (neighbors.path->peers);
1885 GNUNET_free (neighbors.path);
1891 * Core handler for mesh network traffic
1893 * @param cls closure
1894 * @param message message
1895 * @param peer peer identity this notification is about
1896 * @param atsi performance data
1898 * @return GNUNET_OK to keep the connection open,
1899 * GNUNET_SYSERR to close it (signal serious error)
1902 handle_mesh_data_to_orig (void *cls, const struct GNUNET_PeerIdentity *peer,
1903 const struct GNUNET_MessageHeader *message,
1904 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
1906 struct GNUNET_MESH_ToOrigin *msg;
1907 struct GNUNET_PeerIdentity id;
1908 struct MeshPeerInfo *peer_info;
1909 struct MeshTunnel *t;
1912 size = ntohs (message->size);
1913 if (size < sizeof (struct GNUNET_MESH_ToOrigin) + /* Payload must be */
1914 sizeof (struct GNUNET_MessageHeader)) /* at least a header */
1916 GNUNET_break_op (0);
1919 msg = (struct GNUNET_MESH_ToOrigin *) message;
1920 t = tunnel_get (&msg->oid, ntohl (msg->tid));
1924 /* TODO notify that we dont know this tunnel (whom)? */
1928 if (t->id.oid == myid)
1930 if (NULL == t->client)
1932 /* got data packet for ownerless tunnel */
1933 GNUNET_break_op (0);
1936 /* TODO signature verification */
1937 GNUNET_SERVER_notification_context_unicast (nc, t->client->handle, message,
1941 peer_info = peer_info_get (&msg->oid);
1942 if (NULL == peer_info)
1944 /* unknown origin of tunnel */
1948 GNUNET_PEER_resolve (t->tree->me->parent->peer, &id);
1949 msg = GNUNET_malloc (size);
1950 memcpy (msg, message, size);
1951 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0,
1952 GNUNET_TIME_UNIT_FOREVER_REL, &id, size,
1953 &send_core_data_raw, msg);
1960 * Core handler for path ACKs
1962 * @param cls closure
1963 * @param message message
1964 * @param peer peer identity this notification is about
1965 * @param atsi performance data
1967 * @return GNUNET_OK to keep the connection open,
1968 * GNUNET_SYSERR to close it (signal serious error)
1970 * FIXME path change state
1973 handle_mesh_path_ack (void *cls, const struct GNUNET_PeerIdentity *peer,
1974 const struct GNUNET_MessageHeader *message,
1975 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
1977 struct GNUNET_MESH_PathACK *msg;
1978 struct MeshTunnel *t;
1979 struct MeshPeerInfo *peer_info;
1981 msg = (struct GNUNET_MESH_PathACK *) message;
1982 t = tunnel_get (&msg->oid, msg->tid);
1985 /* TODO notify that we don't know the tunnel */
1989 /* Message for us? */
1990 if (0 == memcmp (&msg->oid, &my_full_id, sizeof (struct GNUNET_PeerIdentity)))
1993 if (NULL == t->client)
1998 peer_info = peer_info_get (&msg->peer_id);
1999 if (NULL == peer_info)
2001 GNUNET_break_op (0);
2004 /* FIXME change state of peer */
2005 send_client_peer_connected(t, peer_info->id);
2009 peer_info = peer_info_get (&msg->oid);
2010 if (NULL == peer_info)
2012 /* If we know the tunnel, we should DEFINITELY know the peer */
2016 msg = GNUNET_malloc (sizeof (struct GNUNET_MESH_PathACK));
2017 memcpy (msg, message, sizeof (struct GNUNET_MESH_PathACK));
2018 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0,
2019 GNUNET_TIME_UNIT_FOREVER_REL,
2020 path_get_first_hop (t->tree,
2022 sizeof (struct GNUNET_MESH_PathACK),
2023 &send_core_data_raw, msg);
2029 * Functions to handle messages from core
2031 static struct GNUNET_CORE_MessageHandler core_handlers[] = {
2032 {&handle_mesh_path_create, GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE, 0},
2033 {&handle_mesh_data_unicast, GNUNET_MESSAGE_TYPE_MESH_UNICAST, 0},
2034 {&handle_mesh_data_multicast, GNUNET_MESSAGE_TYPE_MESH_MULTICAST, 0},
2035 {&handle_mesh_data_to_orig, GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN, 0},
2036 {&handle_mesh_path_ack, GNUNET_MESSAGE_TYPE_MESH_PATH_ACK,
2037 sizeof (struct GNUNET_MESH_PathACK)},
2043 /******************************************************************************/
2044 /**************** MESH LOCAL HANDLER HELPERS ***********************/
2045 /******************************************************************************/
2048 * deregister_app: iterator for removing each application registered by a client
2050 * @param cls closure
2051 * @param key the hash of the application id (used to access the hashmap)
2052 * @param value the value stored at the key (client)
2054 * @return GNUNET_OK on success
2057 deregister_app (void *cls, const GNUNET_HashCode * key, void *value)
2059 GNUNET_CONTAINER_multihashmap_remove (applications, key, value);
2065 * notify_client_connection_failure: notify a client that the connection to the
2066 * requested remote peer is not possible (for instance, no route found)
2067 * Function called when the socket is ready to queue more data. "buf" will be
2068 * NULL and "size" zero if the socket was closed for writing in the meantime.
2070 * @param cls closure
2071 * @param size number of bytes available in buf
2072 * @param buf where the callee should write the message
2073 * @return number of bytes written to buf
2076 notify_client_connection_failure (void *cls, size_t size, void *buf)
2079 struct MeshPeerInfo *peer_info;
2080 struct GNUNET_MESH_PeerControl *msg;
2081 struct GNUNET_PeerIdentity id;
2083 if (0 == size && NULL == buf)
2085 // TODO retry? cancel?
2089 size_needed = sizeof (struct GNUNET_MESH_PeerControl);
2090 peer_info = (struct MeshPeerInfo *) cls;
2091 msg = (struct GNUNET_MESH_PeerControl *) buf;
2092 msg->header.size = htons (sizeof (struct GNUNET_MESH_PeerControl));
2093 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_DISCONNECTED);
2094 // msg->tunnel_id = htonl(peer_info->t->tid);
2095 GNUNET_PEER_resolve (peer_info->id, &id);
2096 memcpy (&msg->peer, &id, sizeof (struct GNUNET_PeerIdentity));
2104 * Function to process paths received for a new peer addition. The recorded
2105 * paths form the initial tunnel, which can be optimized later.
2106 * Called on each result obtained for the DHT search.
2108 * @param cls closure
2109 * @param exp when will this value expire
2110 * @param key key of the result
2111 * @param get_path NULL-terminated array of pointers
2112 * to the peers on reverse GET path (or NULL if not recorded)
2113 * @param put_path NULL-terminated array of pointers
2114 * to the peers on the PUT path (or NULL if not recorded)
2115 * @param type type of the result
2116 * @param size number of bytes in data
2117 * @param data pointer to the result data
2119 * TODO: re-issue the request after certain time? cancel after X results?
2122 dht_get_id_handler (void *cls, struct GNUNET_TIME_Absolute exp,
2123 const GNUNET_HashCode * key,
2124 const struct GNUNET_PeerIdentity *const *get_path,
2125 const struct GNUNET_PeerIdentity *const *put_path,
2126 enum GNUNET_BLOCK_Type type, size_t size, const void *data)
2128 struct MeshPathInfo *path_info = cls;
2129 struct MeshPeerPath *p;
2130 struct GNUNET_PeerIdentity pi;
2133 if (NULL == get_path || NULL == put_path)
2135 if (NULL == path_info->peer->path_head)
2137 // Find ourselves some alternate initial path to the destination: retry
2138 GNUNET_DHT_get_stop (path_info->peer->dhtget);
2139 GNUNET_PEER_resolve (path_info->peer->id, &pi);
2140 path_info->peer->dhtget = GNUNET_DHT_get_start (dht_handle, /* handle */
2141 GNUNET_TIME_UNIT_FOREVER_REL, /* timeout */
2142 GNUNET_BLOCK_TYPE_TEST, /* type */
2143 &pi.hashPubKey, /*key to search */
2144 4, /* replication level */
2145 GNUNET_DHT_RO_RECORD_ROUTE, NULL, /* bloom filter */
2148 0, /* xquery bits */
2150 (void *) path_info);
2155 p = path_build_from_dht (get_path, put_path);
2156 path_add_to_peer (path_info->peer, p);
2157 for (i = 0; i < path_info->peer->ntunnels; i++)
2159 tunnel_add_peer (path_info->peer->tunnels[i], path_info->peer);
2161 GNUNET_free (path_info);
2168 * Function to process paths received for a new peer addition. The recorded
2169 * paths form the initial tunnel, which can be optimized later.
2170 * Called on each result obtained for the DHT search.
2172 * @param cls closure
2173 * @param exp when will this value expire
2174 * @param key key of the result
2175 * @param get_path NULL-terminated array of pointers
2176 * to the peers on reverse GET path (or NULL if not recorded)
2177 * @param put_path NULL-terminated array of pointers
2178 * to the peers on the PUT path (or NULL if not recorded)
2179 * @param type type of the result
2180 * @param size number of bytes in data
2181 * @param data pointer to the result data
2184 dht_get_type_handler (void *cls, struct GNUNET_TIME_Absolute exp,
2185 const GNUNET_HashCode * key,
2186 const struct GNUNET_PeerIdentity *const *get_path,
2187 const struct GNUNET_PeerIdentity *const *put_path,
2188 enum GNUNET_BLOCK_Type type, size_t size,
2191 const struct GNUNET_PeerIdentity *pi = data;
2192 struct GNUNET_PeerIdentity id;
2193 struct MeshTunnel *t = cls;
2194 struct MeshPeerInfo *peer_info;
2195 struct MeshPathInfo *path_info;
2196 struct MeshPeerPath *p;
2199 if (size != sizeof (struct GNUNET_PeerIdentity))
2201 GNUNET_break_op (0);
2204 GNUNET_assert (NULL != t->client);
2205 GNUNET_DHT_get_stop (t->client->dht_get_type);
2206 t->client->dht_get_type = NULL;
2207 peer_info = peer_info_get (pi);
2208 GNUNET_CONTAINER_multihashmap_put (t->peers, &pi->hashPubKey, peer_info,
2209 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
2211 if ((NULL == get_path || NULL == put_path) && NULL == peer_info->path_head &&
2212 NULL == peer_info->dhtget)
2214 /* we don't have a route to the peer, let's try a direct lookup */
2215 peer_info->dhtget = GNUNET_DHT_get_start (dht_handle,
2217 GNUNET_TIME_UNIT_FOREVER_REL,
2219 GNUNET_BLOCK_TYPE_TEST,
2222 /* key to look up */
2224 /* replication level */
2225 GNUNET_DHT_RO_RECORD_ROUTE,
2226 /* option to dht: record route */
2227 NULL, /* bloom filter */
2230 0, /* xquery bits */
2233 peer_info); /* closure */
2236 p = path_build_from_dht (get_path, put_path);
2237 path_add_to_peer (peer_info, p);
2238 tunnel_add_peer(t, peer_info);
2239 p = tree_get_path_to_peer(t->tree, peer_info->id);
2241 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2242 "MESH: new route for tunnel 0x%x found, has %u hops\n",
2243 t->local_tid, p->length);
2244 for (i = 0; i < p->length; i++)
2246 GNUNET_PEER_resolve (p->peers[0], &id);
2247 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH:\t%d\t%s\n", i,
2248 GNUNET_h2s_full (&id.hashPubKey));
2254 path_info = GNUNET_malloc(sizeof(struct MeshPathInfo));
2256 path_info->peer = peer_info;
2257 path_info->path = p;
2258 GNUNET_PEER_resolve (p->peers[1], &id);
2259 GNUNET_CORE_notify_transmit_ready (core_handle,
2265 GNUNET_TIME_UNIT_FOREVER_REL,
2269 sizeof (struct GNUNET_MESH_ManipulatePath)
2272 sizeof (struct GNUNET_PeerIdentity)),
2274 &send_core_create_path,
2276 path_info); /* cls */
2280 send_client_peer_connected(t, myid);
2283 /******************************************************************************/
2284 /********************* MESH LOCAL HANDLES **************************/
2285 /******************************************************************************/
2289 * Handler for client disconnection
2291 * @param cls closure
2292 * @param client identification of the client; NULL
2293 * for the last call when the server is destroyed
2296 handle_local_client_disconnect (void *cls, struct GNUNET_SERVER_Client *client)
2298 struct MeshClient *c;
2299 struct MeshClient *next;
2301 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: client disconnected\n");
2303 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: (SERVER DOWN)\n");
2307 if (c->handle != client && NULL != client)
2309 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: ... searching\n");
2313 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: matching client found\n");
2314 if (NULL != c->tunnels)
2316 GNUNET_CONTAINER_multihashmap_iterate (c->tunnels,
2317 &tunnel_destroy_iterator,
2319 GNUNET_CONTAINER_multihashmap_destroy (c->tunnels);
2322 /* deregister clients applications */
2323 if (NULL != c->apps)
2325 GNUNET_CONTAINER_multihashmap_iterate (c->apps, &deregister_app, NULL);
2326 GNUNET_CONTAINER_multihashmap_destroy (c->apps);
2328 if (0 == GNUNET_CONTAINER_multihashmap_size (applications) &&
2329 GNUNET_SCHEDULER_NO_TASK != announce_applications_task)
2331 GNUNET_SCHEDULER_cancel (announce_applications_task);
2332 announce_applications_task = GNUNET_SCHEDULER_NO_TASK;
2334 if (NULL != c->types)
2335 GNUNET_CONTAINER_multihashmap_destroy (c->types);
2336 if (NULL != c->dht_get_type)
2337 GNUNET_DHT_get_stop (c->dht_get_type);
2338 GNUNET_CONTAINER_DLL_remove (clients, clients_tail, c);
2344 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: done!\n");
2350 * Handler for new clients
2352 * @param cls closure
2353 * @param client identification of the client
2354 * @param message the actual message, which includes messages the client wants
2357 handle_local_new_client (void *cls, struct GNUNET_SERVER_Client *client,
2358 const struct GNUNET_MessageHeader *message)
2360 struct GNUNET_MESH_ClientConnect *cc_msg;
2361 struct MeshClient *c;
2362 GNUNET_MESH_ApplicationType *a;
2369 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: new client connected\n");
2370 /* Check data sanity */
2371 size = ntohs (message->size) - sizeof (struct GNUNET_MESH_ClientConnect);
2372 cc_msg = (struct GNUNET_MESH_ClientConnect *) message;
2373 ntypes = ntohs (cc_msg->types);
2374 napps = ntohs (cc_msg->applications);
2376 ntypes * sizeof (uint16_t) + napps * sizeof (GNUNET_MESH_ApplicationType))
2379 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2383 /* Create new client structure */
2384 c = GNUNET_malloc (sizeof (struct MeshClient));
2386 c->id = next_client_id++;
2389 a = (GNUNET_MESH_ApplicationType *) &cc_msg[1];
2392 GNUNET_MESH_ApplicationType at;
2395 c->apps = GNUNET_CONTAINER_multihashmap_create (napps);
2396 for (i = 0; i < napps; i++)
2399 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: app type: %u\n", at);
2400 GNUNET_CRYPTO_hash (&at, sizeof (at), &hc);
2401 /* store in clients hashmap */
2402 GNUNET_CONTAINER_multihashmap_put (c->apps, &hc, c,
2403 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
2404 /* store in global hashmap, for announcements */
2405 GNUNET_CONTAINER_multihashmap_put (applications, &hc, c,
2406 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
2408 if (GNUNET_SCHEDULER_NO_TASK == announce_applications_task)
2409 announce_applications_task =
2410 GNUNET_SCHEDULER_add_now (&announce_applications, NULL);
2418 t = (uint16_t *) & a[napps];
2419 c->types = GNUNET_CONTAINER_multihashmap_create (ntypes);
2420 for (i = 0; i < ntypes; i++)
2423 GNUNET_CRYPTO_hash (&u16, sizeof (u16), &hc);
2425 /* store in clients hashmap */
2426 GNUNET_CONTAINER_multihashmap_put (c->types, &hc, c,
2427 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
2428 /* store in global hashmap */
2429 GNUNET_CONTAINER_multihashmap_put (types, &hc, c,
2430 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
2433 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2434 "MESH: client has %u+%u subscriptions\n", napps, ntypes);
2436 GNUNET_CONTAINER_DLL_insert (clients, clients_tail, c);
2437 c->tunnels = GNUNET_CONTAINER_multihashmap_create (32);
2438 GNUNET_SERVER_notification_context_add (nc, client);
2440 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2442 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: new client processed\n");
2448 * Handler for requests of new tunnels
2450 * @param cls closure
2451 * @param client identification of the client
2452 * @param message the actual message
2455 handle_local_tunnel_create (void *cls, struct GNUNET_SERVER_Client *client,
2456 const struct GNUNET_MessageHeader *message)
2458 struct GNUNET_MESH_TunnelMessage *t_msg;
2459 struct MeshTunnel *t;
2460 struct MeshClient *c;
2461 GNUNET_HashCode hash;
2463 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: new tunnel requested\n");
2465 /* Sanity check for client registration */
2466 if (NULL == (c = client_get (client)))
2469 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2473 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: by client %u\n", c->id);
2476 /* Message sanity check */
2477 if (sizeof (struct GNUNET_MESH_TunnelMessage) != ntohs (message->size))
2480 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2484 t_msg = (struct GNUNET_MESH_TunnelMessage *) message;
2485 /* Sanity check for tunnel numbering */
2486 if (0 == (ntohl (t_msg->tunnel_id) & GNUNET_MESH_LOCAL_TUNNEL_ID_CLI))
2489 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2492 /* Sanity check for duplicate tunnel IDs */
2493 if (NULL != tunnel_get_by_local_id (c, ntohl (t_msg->tunnel_id)))
2496 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2500 t = GNUNET_malloc (sizeof (struct MeshTunnel));
2501 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: CREATED TUNNEL at %p\n", t);
2502 while (NULL != tunnel_get_by_pi (myid, next_tid))
2503 next_tid = (next_tid + 1) & ~GNUNET_MESH_LOCAL_TUNNEL_ID_CLI;
2504 t->id.tid = next_tid++;
2506 t->local_tid = ntohl (t_msg->tunnel_id);
2508 t->peers = GNUNET_CONTAINER_multihashmap_create (32);
2510 GNUNET_CRYPTO_hash (&t->local_tid, sizeof (MESH_TunnelNumber), &hash);
2512 GNUNET_CONTAINER_multihashmap_put (c->tunnels, &hash, t,
2513 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
2516 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2520 GNUNET_CRYPTO_hash (&t->id, sizeof (struct MESH_TunnelID), &hash);
2522 GNUNET_CONTAINER_multihashmap_put (tunnels, &hash, t,
2523 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
2526 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2529 t->tree = tree_new (t, myid);
2530 t->tree->refresh = REFRESH_PATH_TIME;
2531 t->tree->root->status = MESH_PEER_READY;
2532 t->tree->me = t->tree->root;
2534 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2540 * Handler for requests of deleting tunnels
2542 * @param cls closure
2543 * @param client identification of the client
2544 * @param message the actual message
2547 handle_local_tunnel_destroy (void *cls, struct GNUNET_SERVER_Client *client,
2548 const struct GNUNET_MessageHeader *message)
2550 struct GNUNET_MESH_TunnelMessage *tunnel_msg;
2551 struct MeshClient *c;
2552 struct MeshTunnel *t;
2553 MESH_TunnelNumber tid;
2554 GNUNET_HashCode hash;
2556 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: destroying tunnel\n");
2558 /* Sanity check for client registration */
2559 if (NULL == (c = client_get (client)))
2562 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2565 /* Message sanity check */
2566 if (sizeof (struct GNUNET_MESH_TunnelMessage) != ntohs (message->size))
2569 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2573 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: by client %u\n", c->id);
2575 tunnel_msg = (struct GNUNET_MESH_TunnelMessage *) message;
2577 /* Retrieve tunnel */
2578 tid = ntohl (tunnel_msg->tunnel_id);
2580 /* Remove from local id hashmap */
2581 GNUNET_CRYPTO_hash (&tid, sizeof (MESH_TunnelNumber), &hash);
2582 t = GNUNET_CONTAINER_multihashmap_get (c->tunnels, &hash);
2583 GNUNET_CONTAINER_multihashmap_remove (c->tunnels, &hash, t);
2585 /* Remove from global id hashmap */
2586 GNUNET_CRYPTO_hash (&t->id, sizeof (struct MESH_TunnelID), &hash);
2587 GNUNET_CONTAINER_multihashmap_remove (tunnels, &hash, t);
2589 // notify_tunnel_destroy(t); FIXME
2591 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2597 * Handler for connection requests to new peers
2599 * @param cls closure
2600 * @param client identification of the client
2601 * @param message the actual message (PeerControl)
2606 handle_local_connect_add (void *cls, struct GNUNET_SERVER_Client *client,
2607 const struct GNUNET_MessageHeader *message)
2609 struct GNUNET_MESH_PeerControl *peer_msg;
2610 struct MeshClient *c;
2611 struct MeshTunnel *t;
2612 MESH_TunnelNumber tid;
2613 struct MeshPeerInfo *peer_info;
2616 /* Sanity check for client registration */
2617 if (NULL == (c = client_get (client)))
2620 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2624 peer_msg = (struct GNUNET_MESH_PeerControl *) message;
2625 /* Sanity check for message size */
2626 if (sizeof (struct GNUNET_MESH_PeerControl) != ntohs (peer_msg->header.size))
2629 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2633 /* Tunnel exists? */
2634 tid = ntohl (peer_msg->tunnel_id);
2635 t = tunnel_get_by_local_id (c, tid);
2639 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2643 /* Does client own tunnel? */
2644 if (t->client->handle != client)
2647 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2652 peer_info = peer_info_get (&peer_msg->peer);
2654 /* Start DHT search if needed FIXME: if not already connected */
2655 if (NULL == peer_info->dhtget)
2657 peer_info->dhtget = GNUNET_DHT_get_start (dht_handle, GNUNET_TIME_UNIT_FOREVER_REL, GNUNET_BLOCK_TYPE_TEST, &peer_msg->peer.hashPubKey, 4, /* replication level */
2658 GNUNET_DHT_RO_RECORD_ROUTE, NULL, /* bloom filter */
2661 0, /* xquery bits */
2663 (void *) peer_info);
2666 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2672 * Handler for disconnection requests of peers in a tunnel
2674 * @param cls closure
2675 * @param client identification of the client
2676 * @param message the actual message (PeerControl)
2679 handle_local_connect_del (void *cls, struct GNUNET_SERVER_Client *client,
2680 const struct GNUNET_MessageHeader *message)
2682 struct GNUNET_MESH_PeerControl *peer_msg;
2683 struct MeshClient *c;
2684 struct MeshTunnel *t;
2685 MESH_TunnelNumber tid;
2687 /* Sanity check for client registration */
2688 if (NULL == (c = client_get (client)))
2691 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2694 peer_msg = (struct GNUNET_MESH_PeerControl *) message;
2695 /* Sanity check for message size */
2696 if (sizeof (struct GNUNET_MESH_PeerControl) != ntohs (peer_msg->header.size))
2699 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2703 /* Tunnel exists? */
2704 tid = ntohl (peer_msg->tunnel_id);
2705 t = tunnel_get_by_local_id (c, tid);
2709 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2713 /* Does client own tunnel? */
2714 if (t->client->handle != client)
2717 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2721 /* Ok, delete peer from tunnel */
2722 GNUNET_CONTAINER_multihashmap_remove_all (t->peers,
2723 &peer_msg->peer.hashPubKey);
2725 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2731 * Handler for connection requests to new peers by type
2733 * @param cls closure
2734 * @param client identification of the client
2735 * @param message the actual message (ConnectPeerByType)
2738 handle_local_connect_by_type (void *cls, struct GNUNET_SERVER_Client *client,
2739 const struct GNUNET_MessageHeader *message)
2741 struct GNUNET_MESH_ConnectPeerByType *connect_msg;
2742 struct MeshClient *c;
2743 struct MeshTunnel *t;
2744 GNUNET_HashCode hash;
2745 GNUNET_MESH_ApplicationType type;
2746 MESH_TunnelNumber tid;
2748 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: got connect by type request\n");
2749 /* Sanity check for client registration */
2750 if (NULL == (c = client_get (client)))
2753 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2757 connect_msg = (struct GNUNET_MESH_ConnectPeerByType *) message;
2758 /* Sanity check for message size */
2759 if (sizeof (struct GNUNET_MESH_ConnectPeerByType) !=
2760 ntohs (connect_msg->header.size))
2763 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2767 /* Tunnel exists? */
2768 tid = ntohl (connect_msg->tunnel_id);
2769 t = tunnel_get_by_local_id (c, tid);
2773 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2777 /* Does client own tunnel? */
2778 if (t->client->handle != client)
2781 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2785 /* Do WE have the service? */
2786 type = ntohl (connect_msg->type);
2787 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: type requested: %u\n", type);
2788 GNUNET_CRYPTO_hash (&type, sizeof (GNUNET_MESH_ApplicationType), &hash);
2789 if (GNUNET_CONTAINER_multihashmap_contains (applications, &hash) ==
2792 /* Yes! Fast forward, add ourselves to the tunnel and send the
2793 * good news to the client
2795 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: available locally\n");
2796 GNUNET_CONTAINER_multihashmap_put (t->peers, &my_full_id.hashPubKey,
2797 peer_info_get (&my_full_id),
2798 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
2800 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: notifying client\n");
2801 send_client_peer_connected(t, myid);
2802 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Done\n");
2803 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2806 /* Ok, lets find a peer offering the service */
2807 if (c->dht_get_type)
2809 GNUNET_DHT_get_stop (c->dht_get_type);
2811 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: looking in DHT for %s\n",
2812 GNUNET_h2s_full (&hash));
2814 GNUNET_DHT_get_start (dht_handle, GNUNET_TIME_UNIT_FOREVER_REL,
2815 GNUNET_BLOCK_TYPE_TEST, &hash, 10U,
2816 GNUNET_DHT_RO_RECORD_ROUTE, NULL, 0, NULL, 0,
2817 &dht_get_type_handler, t);
2819 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2825 * Handler for client traffic directed to one peer
2827 * @param cls closure
2828 * @param client identification of the client
2829 * @param message the actual message
2832 handle_local_unicast (void *cls, struct GNUNET_SERVER_Client *client,
2833 const struct GNUNET_MessageHeader *message)
2835 struct MeshClient *c;
2836 struct MeshTunnel *t;
2837 struct MeshPeerInfo *pi;
2838 struct GNUNET_MESH_Unicast *data_msg;
2839 struct MeshDataDescriptor *info;
2840 MESH_TunnelNumber tid;
2843 /* Sanity check for client registration */
2844 if (NULL == (c = client_get (client)))
2847 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2850 data_msg = (struct GNUNET_MESH_Unicast *) message;
2851 /* Sanity check for message size */
2852 if (sizeof (struct GNUNET_MESH_Unicast) +
2853 sizeof (struct GNUNET_MessageHeader) > ntohs (data_msg->header.size))
2856 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2860 /* Tunnel exists? */
2861 tid = ntohl (data_msg->tid);
2862 t = tunnel_get_by_local_id (c, tid);
2866 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2870 /* Is it a local tunnel? Then, does client own the tunnel? */
2871 if (t->client->handle != NULL && t->client->handle != client)
2874 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2878 pi = GNUNET_CONTAINER_multihashmap_get (t->peers,
2879 &data_msg->destination.hashPubKey);
2880 /* Is the selected peer in the tunnel? */
2884 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2889 struct GNUNET_MESH_Unicast copy;
2891 /* Work around const limitation */
2892 memcpy (©, data_msg, sizeof (struct GNUNET_MESH_Unicast));
2893 copy.oid = my_full_id;
2894 copy.tid = htonl (t->id.tid);
2895 handle_mesh_data_unicast (NULL, &my_full_id, ©.header, NULL);
2898 data_size = ntohs (message->size) - sizeof (struct GNUNET_MESH_Unicast);
2899 info = GNUNET_malloc (sizeof (struct MeshDataDescriptor) + data_size);
2900 memcpy (&info[1], &data_msg[1], data_size);
2901 info->destination = pi->id;
2902 info->origin = &t->id;
2903 info->size = data_size;
2904 info->client = client;
2905 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0,
2906 GNUNET_TIME_UNIT_FOREVER_REL,
2907 path_get_first_hop (t->tree, pi->id),
2908 /* FIXME re-check types */
2910 sizeof (struct GNUNET_MESH_Unicast),
2911 &send_core_data_unicast, info);
2916 * Handler for client traffic directed to all peers in a tunnel
2918 * @param cls closure
2919 * @param client identification of the client
2920 * @param message the actual message
2923 handle_local_multicast (void *cls, struct GNUNET_SERVER_Client *client,
2924 const struct GNUNET_MessageHeader *message)
2926 struct MeshClient *c;
2927 struct MeshTunnel *t;
2928 struct GNUNET_MESH_Multicast *data_msg;
2929 MESH_TunnelNumber tid;
2931 /* Sanity check for client registration */
2932 if (NULL == (c = client_get (client)))
2935 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2938 data_msg = (struct GNUNET_MESH_Multicast *) message;
2939 /* Sanity check for message size */
2940 if (sizeof (struct GNUNET_MESH_PeerControl) != ntohs (data_msg->header.size))
2943 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2947 /* Tunnel exists? */
2948 tid = ntohl (data_msg->tid);
2949 t = tunnel_get_by_local_id (c, tid);
2953 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2957 /* Does client own tunnel? */
2958 if (t->client->handle != client)
2961 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2967 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2972 * Functions to handle messages from clients
2974 static struct GNUNET_SERVER_MessageHandler client_handlers[] = {
2975 {&handle_local_new_client, NULL, GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT, 0},
2976 {&handle_local_tunnel_create, NULL,
2977 GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE,
2978 sizeof (struct GNUNET_MESH_TunnelMessage)},
2979 {&handle_local_tunnel_destroy, NULL,
2980 GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY,
2981 sizeof (struct GNUNET_MESH_TunnelMessage)},
2982 {&handle_local_connect_add, NULL,
2983 GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD,
2984 sizeof (struct GNUNET_MESH_PeerControl)},
2985 {&handle_local_connect_del, NULL,
2986 GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_DEL,
2987 sizeof (struct GNUNET_MESH_PeerControl)},
2988 {&handle_local_connect_by_type, NULL,
2989 GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD_BY_TYPE,
2990 sizeof (struct GNUNET_MESH_ConnectPeerByType)},
2991 {&handle_local_unicast, NULL,
2992 GNUNET_MESSAGE_TYPE_MESH_UNICAST, 0},
2993 {&handle_local_unicast, NULL,
2994 GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN, 0},
2995 {&handle_local_multicast, NULL,
2996 GNUNET_MESSAGE_TYPE_MESH_MULTICAST, 0},
3002 * To be called on core init/fail.
3004 * @param cls service closure
3005 * @param server handle to the server for this service
3006 * @param identity the public identity of this peer
3007 * @param publicKey the public key of this peer
3010 core_init (void *cls, struct GNUNET_CORE_Handle *server,
3011 const struct GNUNET_PeerIdentity *identity,
3012 const struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *publicKey)
3014 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Core init\n");
3015 core_handle = server;
3016 if (0 != memcmp(identity, &my_full_id, sizeof(my_full_id)) || NULL == server)
3018 GNUNET_log(GNUNET_ERROR_TYPE_ERROR, _("MESH: Wrong CORE service\n"));
3019 GNUNET_SCHEDULER_shutdown();
3025 * Method called whenever a given peer connects.
3027 * @param cls closure
3028 * @param peer peer identity this notification is about
3029 * @param atsi performance data for the connection
3032 core_connect (void *cls, const struct GNUNET_PeerIdentity *peer,
3033 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
3035 // GNUNET_PEER_Id pid;
3036 struct MeshPeerInfo *peer_info;
3037 struct MeshPeerPath *path;
3039 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Peer connected\n");
3040 peer_info = peer_info_get (peer);
3041 if (myid == peer_info->id)
3043 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: (self)\n");
3046 path = path_new (2);
3047 path->peers[0] = myid;
3048 path->peers[1] = peer_info->id;
3049 path_add_to_peer (peer_info, path);
3054 * Method called whenever a peer disconnects.
3056 * @param cls closure
3057 * @param peer peer identity this notification is about
3060 core_disconnect (void *cls, const struct GNUNET_PeerIdentity *peer)
3062 struct MeshPeerInfo *pi;
3065 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Peer disconnected\n");
3066 pi = GNUNET_CONTAINER_multihashmap_get (peers, &peer->hashPubKey);
3072 for (i = 0; i < CORE_QUEUE_SIZE; i++)
3074 if (pi->core_transmit[i])
3076 GNUNET_CORE_notify_transmit_ready_cancel (pi->core_transmit[i]);
3077 /* TODO: notify that tranmission has failed */
3078 GNUNET_free (pi->infos[i]);
3081 path_remove_from_peer (pi, pi->id, myid);
3084 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: (self)\n");
3090 /******************************************************************************/
3091 /************************ MAIN FUNCTIONS ****************************/
3092 /******************************************************************************/
3095 * Task run during shutdown.
3101 shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
3103 struct MeshClient *c;
3105 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: shutting down\n");
3106 if (core_handle != NULL)
3108 GNUNET_CORE_disconnect (core_handle);
3111 if (dht_handle != NULL)
3113 for (c = clients; NULL != c; c = c->next)
3114 if (NULL != c->dht_get_type)
3115 GNUNET_DHT_get_stop (c->dht_get_type);
3116 GNUNET_DHT_disconnect (dht_handle);
3121 GNUNET_SERVER_notification_context_destroy (nc);
3124 if (GNUNET_SCHEDULER_NO_TASK != announce_id_task)
3126 GNUNET_SCHEDULER_cancel (announce_id_task);
3127 announce_id_task = GNUNET_SCHEDULER_NO_TASK;
3129 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: shut down\n");
3133 * Process mesh requests.
3135 * @param cls closure
3136 * @param server the initialized server
3137 * @param c configuration to use
3140 run (void *cls, struct GNUNET_SERVER_Handle *server,
3141 const struct GNUNET_CONFIGURATION_Handle *c)
3143 struct MeshPeerInfo *peer;
3144 struct MeshPeerPath *p;
3147 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: starting to run\n");
3148 server_handle = server;
3149 core_handle = GNUNET_CORE_connect (c, /* Main configuration */
3150 CORE_QUEUE_SIZE, /* queue size */
3151 NULL, /* Closure passed to MESH functions */
3152 &core_init, /* Call core_init once connected */
3153 &core_connect, /* Handle connects */
3154 &core_disconnect, /* remove peers on disconnects */
3155 NULL, /* Do we care about "status" updates? */
3156 NULL, /* Don't notify about all incoming messages */
3157 GNUNET_NO, /* For header only in notification */
3158 NULL, /* Don't notify about all outbound messages */
3159 GNUNET_NO, /* For header-only out notification */
3160 core_handlers); /* Register these handlers */
3161 if (core_handle == NULL)
3164 GNUNET_SCHEDULER_shutdown ();
3169 GNUNET_CONFIGURATION_get_value_filename (c, "GNUNETD", "HOSTKEY",
3172 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3174 ("Mesh service is lacking key configuration settings. Exiting.\n"));
3175 GNUNET_SCHEDULER_shutdown ();
3178 my_private_key = GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
3179 GNUNET_free (keyfile);
3180 if (my_private_key == NULL)
3182 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3183 _("Mesh service could not access hostkey. Exiting.\n"));
3184 GNUNET_SCHEDULER_shutdown ();
3187 GNUNET_CRYPTO_rsa_key_get_public (my_private_key, &my_public_key);
3188 GNUNET_CRYPTO_hash (&my_public_key, sizeof (my_public_key),
3189 &my_full_id.hashPubKey);
3190 myid = GNUNET_PEER_intern (&my_full_id);
3192 dht_handle = GNUNET_DHT_connect (c, 64);
3193 if (dht_handle == NULL)
3195 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Error connecting to DHT.\
3196 Running without DHT has a severe\
3197 impact in MESH capabilities.\n\
3198 Plase check your configuretion and enable DHT.\n");
3204 tunnels = GNUNET_CONTAINER_multihashmap_create (32);
3205 peers = GNUNET_CONTAINER_multihashmap_create (32);
3206 applications = GNUNET_CONTAINER_multihashmap_create (32);
3207 types = GNUNET_CONTAINER_multihashmap_create (32);
3209 GNUNET_SERVER_add_handlers (server_handle, client_handlers);
3210 nc = GNUNET_SERVER_notification_context_create (server_handle,
3212 GNUNET_SERVER_disconnect_notify (server_handle,
3213 &handle_local_client_disconnect,
3218 clients_tail = NULL;
3223 announce_applications_task = GNUNET_SCHEDULER_NO_TASK;
3224 announce_id_task = GNUNET_SCHEDULER_add_now (&announce_id, cls);
3226 /* Create a peer_info for the local peer */
3227 peer = peer_info_get(&my_full_id);
3230 path_add_to_peer(peer, p);
3232 /* Scheduled the task to clean up when shutdown is called */
3233 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &shutdown_task,
3236 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: end of run()\n");
3240 * The main function for the mesh service.
3242 * @param argc number of arguments from the command line
3243 * @param argv command line arguments
3244 * @return 0 ok, 1 on error
3247 main (int argc, char *const *argv)
3252 fprintf (stderr, "main ()\n");
3254 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: main()\n");
3257 GNUNET_SERVICE_run (argc, argv, "mesh", GNUNET_SERVICE_OPTION_NONE, &run,
3259 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: main() END\n");
3261 fprintf (stderr, "main () END\n");