2 This file is part of GNUnet.
3 (C) 2001 - 2011 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
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11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
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17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
22 * @file mesh/gnunet-service-mesh.c
23 * @brief GNUnet MESH service
24 * @author Bartlomiej Polot
30 * - PERIODIC FUNCTIONS
31 * - MESH NETWORK HANDLER HELPERS
32 * - MESH NETWORK HANDLES
33 * - MESH LOCAL HANDLER HELPERS
34 * - MESH LOCAL HANDLES
35 * - MAIN FUNCTIONS (main & run)
38 * - error reporting (CREATE/CHANGE/ADD/DEL?) -- new message!
39 * - partial disconnect reporting -- same as error reporting?
40 * - add vs create? change vs. keep-alive? same msg or different ones? -- thinking...
41 * - speed requirement specification (change?) in mesh API -- API call
43 * - 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 MeshTunnelTreeNode *n;
1109 struct MeshPeerPath *p;
1110 struct MeshPeerPath *best_p;
1111 unsigned int best_cost;
1114 if (NULL != tree_find_peer(t->tree->root, peer->id))
1116 /* Already have it, nothing to do. */
1121 GNUNET_array_append (peer->tunnels, peer->ntunnels, t);
1122 if (NULL == (p = peer->path_head))
1129 best_cost = UINT_MAX;
1132 if ((cost = path_get_cost (t->tree, p)) < best_cost)
1139 tree_add_path (t->tree, best_p, ¬ify_peer_disconnected);
1140 if (GNUNET_SCHEDULER_NO_TASK == t->path_refresh_task)
1141 t->path_refresh_task =
1142 GNUNET_SCHEDULER_add_delayed (t->tree->refresh, &path_refresh, t);
1147 * Notify a tunnel that a connection has broken that affects at least
1148 * some of its peers.
1150 * @param t Tunnel affected.
1151 * @param peer Peer that (at least) has been affected by the disconnection.
1152 * @param p1 Peer that got disconnected from p2.
1153 * @param p2 Peer that got disconnected from p1.
1155 * @return Short ID of the peer disconnected (either p1 or p2).
1156 * 0 if the tunnel remained unaffected.
1158 static GNUNET_PEER_Id
1159 tunnel_notify_connection_broken (struct MeshTunnel *t,
1160 struct MeshPeerInfo *peer,
1164 return tree_notify_connection_broken (t->tree, p1, p2,
1165 ¬ify_peer_disconnected);
1170 * Destroy the tunnel and free any allocated resources linked to it
1172 * @param t the tunnel to destroy
1174 * @return GNUNET_OK on success
1177 tunnel_destroy (struct MeshTunnel *t)
1179 struct MeshClient *c;
1180 struct MeshQueue *q;
1181 struct MeshQueue *qn;
1182 GNUNET_HashCode hash;
1185 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: DESTROYING TUNNEL at %p\n", t);
1191 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: by client %u\n", c->id);
1194 GNUNET_CRYPTO_hash (&t->id, sizeof (struct MESH_TunnelID), &hash);
1195 if (GNUNET_YES != GNUNET_CONTAINER_multihashmap_remove (tunnels, &hash, t))
1200 GNUNET_CRYPTO_hash (&t->local_tid, sizeof (MESH_TunnelNumber), &hash);
1201 if (GNUNET_YES != GNUNET_CONTAINER_multihashmap_remove (c->tunnels, &hash, t))
1205 GNUNET_CONTAINER_multihashmap_destroy (t->peers);
1209 if (NULL != q->data)
1210 GNUNET_free (q->data);
1214 /* TODO cancel core transmit ready in case it was active */
1216 tree_destroy(t->tree);
1223 * tunnel_destroy_iterator: iterator for deleting each tunnel that belongs to a
1224 * client when the client disconnects.
1226 * @param cls closure (client that is disconnecting)
1227 * @param key the hash of the local tunnel id (used to access the hashmap)
1228 * @param value the value stored at the key (tunnel to destroy)
1230 * @return GNUNET_OK on success
1233 tunnel_destroy_iterator (void *cls, const GNUNET_HashCode * key, void *value)
1237 r = tunnel_destroy ((struct MeshTunnel *) value);
1242 /******************************************************************************/
1243 /**************** MESH NETWORK HANDLER HELPERS ***********************/
1244 /******************************************************************************/
1248 * Function called to notify a client about the socket
1249 * being ready to queue more data. "buf" will be
1250 * NULL and "size" zero if the socket was closed for
1251 * writing in the meantime.
1253 * @param cls closure
1254 * @param size number of bytes available in buf
1255 * @param buf where the callee should write the message
1256 * @return number of bytes written to buf
1259 send_core_create_path (void *cls, size_t size, void *buf)
1261 struct MeshPathInfo *info = cls;
1262 struct GNUNET_MESH_ManipulatePath *msg;
1263 struct GNUNET_PeerIdentity *peer_ptr;
1264 struct MeshPeerInfo *peer = info->peer;
1265 struct MeshTunnel *t = info->t;
1266 struct MeshPeerPath *p = info->path;
1271 sizeof (struct GNUNET_MESH_ManipulatePath) +
1272 p->length * sizeof (struct GNUNET_PeerIdentity);
1274 if (size < size_needed || NULL == buf)
1276 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Retransmitting create path\n");
1277 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0,
1278 GNUNET_TIME_UNIT_FOREVER_REL,
1279 path_get_first_hop (t->tree, peer->id),
1280 size_needed, &send_core_create_path,
1285 msg = (struct GNUNET_MESH_ManipulatePath *) buf;
1286 msg->header.size = htons (size_needed);
1287 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE);
1288 msg->tid = ntohl (t->id.tid);
1290 peer_ptr = (struct GNUNET_PeerIdentity *) &msg[1];
1291 for (i = 0; i < p->length; i++)
1293 GNUNET_PEER_resolve (p->peers[i], peer_ptr++);
1305 * Function called to notify a client about the socket
1306 * being ready to queue more data. "buf" will be
1307 * NULL and "size" zero if the socket was closed for
1308 * writing in the meantime.
1310 * @param cls closure (MeshDataDescriptor with all info to build packet)
1311 * @param size number of bytes available in buf
1312 * @param buf where the callee should write the message
1313 * @return number of bytes written to buf
1316 send_core_data_to_origin (void *cls, size_t size, void *buf)
1318 struct MeshDataDescriptor *info = cls;
1319 struct GNUNET_MESH_ToOrigin *msg = buf;
1322 GNUNET_assert (NULL != info);
1323 total_size = sizeof (struct GNUNET_MESH_ToOrigin) + info->size;
1324 GNUNET_assert (total_size < 65536); /* UNIT16_MAX */
1326 if (total_size > size)
1328 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1329 "not enough buffer to send data to origin\n");
1332 msg->header.size = htons (total_size);
1333 msg->header.type = htons (GNUNET_MESSAGE_TYPE_DATA_MESSAGE_TO_ORIGIN);
1334 GNUNET_PEER_resolve (info->origin->oid, &msg->oid);
1335 msg->tid = htonl (info->origin->tid);
1336 if (0 != info->size)
1338 memcpy (&msg[1], &info[1], info->size);
1340 if (NULL != info->client)
1342 GNUNET_SERVER_receive_done (info->client, GNUNET_OK);
1350 * Function called to notify a client about the socket
1351 * being ready to queue more data. "buf" will be
1352 * NULL and "size" zero if the socket was closed for
1353 * writing in the meantime.
1355 * @param cls closure (data itself)
1356 * @param size number of bytes available in buf
1357 * @param buf where the callee should write the message
1358 * @return number of bytes written to buf
1361 send_core_data_unicast (void *cls, size_t size, void *buf)
1363 struct MeshDataDescriptor *info = cls;
1364 struct GNUNET_MESH_Unicast *msg = buf;
1367 GNUNET_assert (NULL != info);
1368 total_size = sizeof (struct GNUNET_MESH_Unicast) + info->size;
1369 GNUNET_assert (total_size < 65536); /* UNIT16_MAX */
1371 if (total_size > size)
1373 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1374 "not enough buffer to send data to peer\n");
1377 msg->header.size = htons (total_size);
1378 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_UNICAST);
1379 GNUNET_PEER_resolve (info->origin->oid, &msg->oid);
1380 GNUNET_PEER_resolve (info->destination, &msg->destination);
1381 msg->tid = htonl (info->origin->tid);
1382 if (0 != info->size)
1384 memcpy (&msg[1], &info[1], info->size);
1386 if (NULL != info->client)
1388 GNUNET_SERVER_receive_done (info->client, GNUNET_OK);
1396 * Function called to notify a client about the socket
1397 * being ready to queue more data. "buf" will be
1398 * NULL and "size" zero if the socket was closed for
1399 * writing in the meantime.
1401 * @param cls closure (data itself)
1402 * @param size number of bytes available in buf
1403 * @param buf where the callee should write the message
1404 * @return number of bytes written to buf
1407 send_core_data_multicast (void *cls, size_t size, void *buf)
1409 struct MeshDataDescriptor *info = cls;
1410 struct GNUNET_MESH_Multicast *msg = buf;
1413 GNUNET_assert (NULL != info);
1414 total_size = info->size + sizeof (struct GNUNET_MESH_Multicast);
1415 GNUNET_assert (total_size < GNUNET_SERVER_MAX_MESSAGE_SIZE);
1419 info->peer->core_transmit[info->handler_n] = NULL;
1421 if (total_size > size)
1423 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1424 "not enough buffer to send data futher\n");
1427 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_MULTICAST);
1428 msg->header.size = htons (total_size);
1429 GNUNET_PEER_resolve (info->origin->oid, &msg->oid);
1430 msg->tid = htonl (info->origin->tid);
1431 memcpy (&msg[1], &info[1], total_size);
1432 if (0 == --info->copies)
1434 if (NULL != info->client)
1436 GNUNET_SERVER_receive_done (info->client, GNUNET_OK);
1445 * Function called to notify a client about the socket
1446 * being ready to queue more data. "buf" will be
1447 * NULL and "size" zero if the socket was closed for
1448 * writing in the meantime.
1450 * @param cls closure (MeshDataDescriptor)
1451 * @param size number of bytes available in buf
1452 * @param buf where the callee should write the message
1453 * @return number of bytes written to buf
1456 send_core_path_ack (void *cls, size_t size, void *buf)
1458 struct MeshDataDescriptor *info = cls;
1459 struct GNUNET_MESH_PathACK *msg = buf;
1461 GNUNET_assert (NULL != info);
1464 info->peer->core_transmit[info->handler_n] = NULL;
1466 if (sizeof (struct GNUNET_MESH_PathACK) > size)
1471 msg->header.size = htons (sizeof (struct GNUNET_MESH_PathACK));
1472 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_ACK);
1473 GNUNET_PEER_resolve (info->origin->oid, &msg->oid);
1474 msg->tid = htonl (info->origin->tid);
1475 msg->peer_id = my_full_id;
1477 /* TODO add signature */
1479 return sizeof (struct GNUNET_MESH_PathACK);
1484 * Function called to notify a client about the socket
1485 * being ready to queue more data. "buf" will be
1486 * NULL and "size" zero if the socket was closed for
1487 * writing in the meantime.
1489 * @param cls closure (data itself)
1490 * @param size number of bytes available in buf
1491 * @param buf where the callee should write the message
1492 * @return number of bytes written to buf
1495 send_core_data_raw (void *cls, size_t size, void *buf)
1497 struct GNUNET_MessageHeader *msg = cls;
1500 GNUNET_assert (NULL != msg);
1501 total_size = ntohs (msg->size);
1503 if (total_size > size)
1508 memcpy (buf, msg, total_size);
1516 * Send another peer a notification to destroy a tunnel
1517 * @param cls The tunnel to destroy
1518 * @param size Size in the buffer
1519 * @param buf Memory where to put the data to transmit
1520 * @return Size of data put in buffer
1523 send_p2p_tunnel_destroy (void *cls, size_t size, void *buf)
1525 struct MeshTunnel *t = cls;
1526 struct MeshClient *c;
1527 struct GNUNET_MESH_TunnelMessage *msg;
1531 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY);
1532 /*FIXME*/ msg->header.size =
1533 htons (sizeof (struct GNUNET_MESH_TunnelMessage));
1534 msg->tunnel_id = htonl (t->id.tid);
1536 tunnel_destroy (c, t);
1537 return sizeof (struct GNUNET_MESH_TunnelMessage);
1543 * Send the message to all clients that have subscribed to its type
1545 * @param msg Pointer to the message itself
1546 * @return number of clients this message was sent to
1549 send_subscribed_clients (struct GNUNET_MessageHeader *msg)
1551 struct MeshClient *c;
1555 type = ntohs (msg->type);
1556 for (count = 0, c = clients; c != NULL; c = c->next)
1558 if (client_is_subscribed (type, c))
1561 GNUNET_SERVER_notification_context_unicast (nc, c->handle, msg,
1571 * Notify the client that owns the tunnel that a peer has connected to it
1573 * @param t Tunnel whose owner to notify
1574 * @param id Short id of the peer that has connected
1577 send_client_peer_connected (const struct MeshTunnel *t, const GNUNET_PEER_Id id)
1579 struct GNUNET_MESH_PeerControl pc;
1581 pc.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD);
1582 pc.header.size = htons (sizeof (struct GNUNET_MESH_PeerControl));
1583 pc.tunnel_id = htonl (t->local_tid);
1584 GNUNET_PEER_resolve (id, &pc.peer);
1585 GNUNET_SERVER_notification_context_unicast (nc, t->client->handle,
1586 &pc.header, GNUNET_NO);
1590 /******************************************************************************/
1591 /******************** MESH NETWORK HANDLERS **************************/
1592 /******************************************************************************/
1596 * Core handler for path creation
1597 * struct GNUNET_CORE_MessageHandler
1599 * @param cls closure
1600 * @param message message
1601 * @param peer peer identity this notification is about
1602 * @param atsi performance data
1603 * @return GNUNET_OK to keep the connection open,
1604 * GNUNET_SYSERR to close it (signal serious error)
1608 handle_mesh_path_create (void *cls, const struct GNUNET_PeerIdentity *peer,
1609 const struct GNUNET_MessageHeader *message,
1610 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
1612 unsigned int own_pos;
1615 MESH_TunnelNumber tid;
1616 struct GNUNET_MESH_ManipulatePath *msg;
1617 struct GNUNET_PeerIdentity *pi;
1618 struct GNUNET_PeerIdentity id;
1619 GNUNET_HashCode hash;
1620 struct MeshPeerPath *path;
1621 struct MeshPeerInfo *dest_peer_info;
1622 struct MeshPeerInfo *orig_peer_info;
1623 struct MeshTunnel *t;
1625 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1626 "MESH: Received a MESH path create msg\n");
1627 size = ntohs (message->size);
1628 if (size < sizeof (struct GNUNET_MESH_ManipulatePath))
1630 GNUNET_break_op (0);
1634 size -= sizeof (struct GNUNET_MESH_ManipulatePath);
1635 if (size % sizeof (struct GNUNET_PeerIdentity))
1637 GNUNET_break_op (0);
1640 size /= sizeof (struct GNUNET_PeerIdentity);
1643 GNUNET_break_op (0);
1646 msg = (struct GNUNET_MESH_ManipulatePath *) message;
1648 tid = ntohl (msg->tid);
1649 pi = (struct GNUNET_PeerIdentity *) &msg[1];
1650 t = tunnel_get (pi, tid);
1654 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Creating tunnel\n");
1655 t = GNUNET_malloc (sizeof (struct MeshTunnel));
1656 t->id.oid = GNUNET_PEER_intern (pi);
1658 t->peers = GNUNET_CONTAINER_multihashmap_create (32);
1660 GNUNET_CRYPTO_hash (&t->id, sizeof (struct MESH_TunnelID), &hash);
1662 GNUNET_CONTAINER_multihashmap_put (tunnels, &hash, t,
1663 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
1671 GNUNET_CONTAINER_multihashmap_get (peers, &pi[size - 1].hashPubKey);
1672 if (NULL == dest_peer_info)
1674 dest_peer_info = GNUNET_malloc (sizeof (struct MeshPeerInfo));
1675 dest_peer_info->id = GNUNET_PEER_intern (&pi[size - 1]);
1676 GNUNET_CONTAINER_multihashmap_put (peers, &pi[size - 1].hashPubKey,
1678 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
1680 orig_peer_info = GNUNET_CONTAINER_multihashmap_get (peers, &pi->hashPubKey);
1681 if (NULL == orig_peer_info)
1683 orig_peer_info = GNUNET_malloc (sizeof (struct MeshPeerInfo));
1684 orig_peer_info->id = GNUNET_PEER_intern (pi);
1685 GNUNET_CONTAINER_multihashmap_put (peers, &pi->hashPubKey, orig_peer_info,
1686 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
1689 path = path_new (size);
1691 for (i = 0; i < size; i++)
1693 path->peers[i] = GNUNET_PEER_intern (&pi[i]);
1694 if (path->peers[i] == myid)
1698 { /* cannot be self, must be 'not found' */
1699 /* create path: self not found in path through self */
1700 GNUNET_break_op (0);
1701 path_destroy (path);
1702 /* FIXME error. destroy tunnel? leave for timeout? */
1705 if (own_pos == size - 1)
1707 /* It is for us! Send ack. */
1708 struct MeshDataDescriptor *info;
1711 path_add_to_origin (orig_peer_info, path); /* inverts path! */
1712 info = GNUNET_malloc (sizeof (struct MeshDataDescriptor));
1713 info->origin = &t->id;
1714 info->peer = GNUNET_CONTAINER_multihashmap_get (peers, &id.hashPubKey);
1715 GNUNET_assert (info->peer);
1716 for (j = 0; info->peer->core_transmit[j]; j++)
1724 info->handler_n = j;
1725 info->peer->core_transmit[j] =
1726 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 100,
1727 GNUNET_TIME_UNIT_FOREVER_REL, peer,
1728 sizeof (struct GNUNET_MessageHeader),
1729 &send_core_path_ack, info);
1733 /* It's for somebody else! Retransmit. */
1734 struct MeshPathInfo *path_info;
1736 path_info = GNUNET_malloc (sizeof (struct MeshPathInfo));
1738 path_info->path = path;
1739 path_info->peer = dest_peer_info;
1741 path_add_to_peer (dest_peer_info, path);
1742 GNUNET_PEER_resolve (path->peers[own_pos + 1], &id);
1743 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0,
1744 GNUNET_TIME_UNIT_FOREVER_REL, &id,
1745 sizeof (struct GNUNET_MessageHeader),
1746 &send_core_create_path, path_info);
1753 * Core handler for mesh network traffic going from the origin to a peer
1755 * @param cls closure
1756 * @param peer peer identity this notification is about
1757 * @param message message
1758 * @param atsi performance data
1759 * @return GNUNET_OK to keep the connection open,
1760 * GNUNET_SYSERR to close it (signal serious error)
1763 handle_mesh_data_unicast (void *cls, const struct GNUNET_PeerIdentity *peer,
1764 const struct GNUNET_MessageHeader *message,
1765 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
1767 struct GNUNET_MESH_Unicast *msg;
1768 struct MeshTunnel *t;
1769 struct MeshPeerInfo *pi;
1772 size = ntohs (message->size);
1774 sizeof (struct GNUNET_MESH_Unicast) +
1775 sizeof (struct GNUNET_MessageHeader))
1780 msg = (struct GNUNET_MESH_Unicast *) message;
1781 t = tunnel_get (&msg->oid, ntohl (msg->tid));
1784 /* TODO notify back: we don't know this tunnel */
1787 pi = GNUNET_CONTAINER_multihashmap_get (t->peers,
1788 &msg->destination.hashPubKey);
1791 /* TODO maybe feedback, log to statistics */
1796 send_subscribed_clients ((struct GNUNET_MessageHeader *) &msg[1]);
1799 msg = GNUNET_malloc (size);
1800 memcpy (msg, message, size);
1801 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0,
1802 GNUNET_TIME_UNIT_FOREVER_REL,
1803 path_get_first_hop (t->tree, pi->id),
1805 &send_core_data_raw, msg);
1811 * Core handler for mesh network traffic going from the origin to all peers
1813 * @param cls closure
1814 * @param message message
1815 * @param peer peer identity this notification is about
1816 * @param atsi performance data
1817 * @return GNUNET_OK to keep the connection open,
1818 * GNUNET_SYSERR to close it (signal serious error)
1821 handle_mesh_data_multicast (void *cls, const struct GNUNET_PeerIdentity *peer,
1822 const struct GNUNET_MessageHeader *message,
1823 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
1825 struct GNUNET_MESH_Multicast *msg;
1826 struct GNUNET_PeerIdentity id;
1827 struct MeshDataDescriptor *info;
1828 struct MeshPathInfo neighbors;
1829 struct MeshTunnel *t;
1835 size = ntohs (message->size);
1837 sizeof (struct GNUNET_MESH_Multicast) +
1838 sizeof (struct GNUNET_MessageHeader))
1840 GNUNET_break_op (0);
1843 msg = (struct GNUNET_MESH_Multicast *) message;
1844 t = tunnel_get (&msg->oid, ntohl (msg->tid));
1848 /* TODO notify that we dont know that tunnel */
1852 /* Transmit to locally interested clients */
1853 if (GNUNET_CONTAINER_multihashmap_contains (t->peers, &my_full_id.hashPubKey))
1855 send_subscribed_clients ((struct GNUNET_MessageHeader *) &msg[1]);
1858 /* Retransmit to other peers.
1859 * Using path here as just a collection of peers, not a path per se.
1862 neighbors.path = path_new (0);
1863 GNUNET_CONTAINER_multihashmap_iterate (t->peers, &iterate_collect_neighbors,
1865 if (0 == neighbors.path->length)
1867 GNUNET_free (neighbors.path);
1870 size -= sizeof (struct GNUNET_MESH_Multicast);
1871 info = GNUNET_malloc (sizeof (struct MeshDataDescriptor) + size);
1872 info->origin = &t->id;
1873 info->copies = neighbors.path->length;
1874 for (i = 0; i < info->copies; i++)
1876 GNUNET_PEER_resolve (neighbors.path->peers[i], &id);
1877 info->peer = GNUNET_CONTAINER_multihashmap_get (peers, &id.hashPubKey);
1878 GNUNET_assert (NULL != info->peer);
1879 for (j = 0; 0 != info->peer->core_transmit[j]; j++)
1881 if (j == (CORE_QUEUE_SIZE - 1))
1887 info->handler_n = j;
1888 info->peer->infos[j] = info;
1889 info->peer->core_transmit[j] =
1890 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0,
1891 GNUNET_TIME_UNIT_FOREVER_REL, &id,
1892 ntohs (msg->header.size),
1893 &send_core_data_multicast, info);
1895 GNUNET_free (neighbors.path->peers);
1896 GNUNET_free (neighbors.path);
1902 * Core handler for mesh network traffic
1904 * @param cls closure
1905 * @param message message
1906 * @param peer peer identity this notification is about
1907 * @param atsi performance data
1909 * @return GNUNET_OK to keep the connection open,
1910 * GNUNET_SYSERR to close it (signal serious error)
1913 handle_mesh_data_to_orig (void *cls, const struct GNUNET_PeerIdentity *peer,
1914 const struct GNUNET_MessageHeader *message,
1915 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
1917 struct GNUNET_MESH_ToOrigin *msg;
1918 struct GNUNET_PeerIdentity id;
1919 struct MeshPeerInfo *peer_info;
1920 struct MeshTunnel *t;
1923 size = ntohs (message->size);
1924 if (size < sizeof (struct GNUNET_MESH_ToOrigin) + /* Payload must be */
1925 sizeof (struct GNUNET_MessageHeader)) /* at least a header */
1927 GNUNET_break_op (0);
1930 msg = (struct GNUNET_MESH_ToOrigin *) message;
1931 t = tunnel_get (&msg->oid, ntohl (msg->tid));
1935 /* TODO notify that we dont know this tunnel (whom)? */
1939 if (t->id.oid == myid)
1941 if (NULL == t->client)
1943 /* got data packet for ownerless tunnel */
1944 GNUNET_break_op (0);
1947 /* TODO signature verification */
1948 GNUNET_SERVER_notification_context_unicast (nc, t->client->handle, message,
1952 peer_info = peer_info_get (&msg->oid);
1953 if (NULL == peer_info)
1955 /* unknown origin of tunnel */
1959 GNUNET_PEER_resolve (t->tree->me->parent->peer, &id);
1960 msg = GNUNET_malloc (size);
1961 memcpy (msg, message, size);
1962 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0,
1963 GNUNET_TIME_UNIT_FOREVER_REL, &id, size,
1964 &send_core_data_raw, msg);
1971 * Core handler for path ACKs
1973 * @param cls closure
1974 * @param message message
1975 * @param peer peer identity this notification is about
1976 * @param atsi performance data
1978 * @return GNUNET_OK to keep the connection open,
1979 * GNUNET_SYSERR to close it (signal serious error)
1982 handle_mesh_path_ack (void *cls, const struct GNUNET_PeerIdentity *peer,
1983 const struct GNUNET_MessageHeader *message,
1984 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
1986 struct GNUNET_MESH_PathACK *msg;
1987 struct MeshTunnelTreeNode *n;
1988 struct MeshPeerInfo *peer_info;
1989 struct MeshTunnel *t;
1991 msg = (struct GNUNET_MESH_PathACK *) message;
1992 t = tunnel_get (&msg->oid, msg->tid);
1995 /* TODO notify that we don't know the tunnel */
1999 /* Message for us? */
2000 if (0 == memcmp (&msg->oid, &my_full_id, sizeof (struct GNUNET_PeerIdentity)))
2002 if (NULL == t->client)
2004 GNUNET_break_op (0);
2007 peer_info = peer_info_get (&msg->peer_id);
2008 if (NULL == peer_info)
2010 GNUNET_break_op (0);
2013 n = tree_find_peer(t->tree, peer_info->id);
2016 GNUNET_break_op (0);
2019 n->status = MESH_PEER_READY;
2020 send_client_peer_connected(t, peer_info->id);
2024 peer_info = peer_info_get (&msg->oid);
2025 if (NULL == peer_info)
2027 /* If we know the tunnel, we should DEFINITELY know the peer */
2031 msg = GNUNET_malloc (sizeof (struct GNUNET_MESH_PathACK));
2032 memcpy (msg, message, sizeof (struct GNUNET_MESH_PathACK));
2033 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0,
2034 GNUNET_TIME_UNIT_FOREVER_REL,
2035 path_get_first_hop (t->tree,
2037 sizeof (struct GNUNET_MESH_PathACK),
2038 &send_core_data_raw, msg);
2044 * Functions to handle messages from core
2046 static struct GNUNET_CORE_MessageHandler core_handlers[] = {
2047 {&handle_mesh_path_create, GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE, 0},
2048 {&handle_mesh_data_unicast, GNUNET_MESSAGE_TYPE_MESH_UNICAST, 0},
2049 {&handle_mesh_data_multicast, GNUNET_MESSAGE_TYPE_MESH_MULTICAST, 0},
2050 {&handle_mesh_data_to_orig, GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN, 0},
2051 {&handle_mesh_path_ack, GNUNET_MESSAGE_TYPE_MESH_PATH_ACK,
2052 sizeof (struct GNUNET_MESH_PathACK)},
2058 /******************************************************************************/
2059 /**************** MESH LOCAL HANDLER HELPERS ***********************/
2060 /******************************************************************************/
2063 * deregister_app: iterator for removing each application registered by a client
2065 * @param cls closure
2066 * @param key the hash of the application id (used to access the hashmap)
2067 * @param value the value stored at the key (client)
2069 * @return GNUNET_OK on success
2072 deregister_app (void *cls, const GNUNET_HashCode * key, void *value)
2074 GNUNET_CONTAINER_multihashmap_remove (applications, key, value);
2080 * notify_client_connection_failure: notify a client that the connection to the
2081 * requested remote peer is not possible (for instance, no route found)
2082 * Function called when the socket is ready to queue more data. "buf" will be
2083 * NULL and "size" zero if the socket was closed for writing in the meantime.
2085 * @param cls closure
2086 * @param size number of bytes available in buf
2087 * @param buf where the callee should write the message
2088 * @return number of bytes written to buf
2091 notify_client_connection_failure (void *cls, size_t size, void *buf)
2094 struct MeshPeerInfo *peer_info;
2095 struct GNUNET_MESH_PeerControl *msg;
2096 struct GNUNET_PeerIdentity id;
2098 if (0 == size && NULL == buf)
2100 // TODO retry? cancel?
2104 size_needed = sizeof (struct GNUNET_MESH_PeerControl);
2105 peer_info = (struct MeshPeerInfo *) cls;
2106 msg = (struct GNUNET_MESH_PeerControl *) buf;
2107 msg->header.size = htons (sizeof (struct GNUNET_MESH_PeerControl));
2108 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_DISCONNECTED);
2109 // msg->tunnel_id = htonl(peer_info->t->tid);
2110 GNUNET_PEER_resolve (peer_info->id, &id);
2111 memcpy (&msg->peer, &id, sizeof (struct GNUNET_PeerIdentity));
2119 * Function to process paths received for a new peer addition. The recorded
2120 * paths form the initial tunnel, which can be optimized later.
2121 * Called on each result obtained for the DHT search.
2123 * @param cls closure
2124 * @param exp when will this value expire
2125 * @param key key of the result
2126 * @param get_path NULL-terminated array of pointers
2127 * to the peers on reverse GET path (or NULL if not recorded)
2128 * @param put_path NULL-terminated array of pointers
2129 * to the peers on the PUT path (or NULL if not recorded)
2130 * @param type type of the result
2131 * @param size number of bytes in data
2132 * @param data pointer to the result data
2134 * TODO: re-issue the request after certain time? cancel after X results?
2137 dht_get_id_handler (void *cls, struct GNUNET_TIME_Absolute exp,
2138 const GNUNET_HashCode * key,
2139 const struct GNUNET_PeerIdentity *const *get_path,
2140 const struct GNUNET_PeerIdentity *const *put_path,
2141 enum GNUNET_BLOCK_Type type, size_t size, const void *data)
2143 struct MeshPathInfo *path_info = cls;
2144 struct MeshPeerPath *p;
2145 struct GNUNET_PeerIdentity pi;
2148 if (NULL == get_path || NULL == put_path)
2150 if (NULL == path_info->peer->path_head)
2152 // Find ourselves some alternate initial path to the destination: retry
2153 GNUNET_DHT_get_stop (path_info->peer->dhtget);
2154 GNUNET_PEER_resolve (path_info->peer->id, &pi);
2155 path_info->peer->dhtget = GNUNET_DHT_get_start (dht_handle, /* handle */
2156 GNUNET_TIME_UNIT_FOREVER_REL, /* timeout */
2157 GNUNET_BLOCK_TYPE_TEST, /* type */
2158 &pi.hashPubKey, /*key to search */
2159 4, /* replication level */
2160 GNUNET_DHT_RO_RECORD_ROUTE, NULL, /* bloom filter */
2163 0, /* xquery bits */
2165 (void *) path_info);
2170 p = path_build_from_dht (get_path, put_path);
2171 path_add_to_peer (path_info->peer, p);
2172 for (i = 0; i < path_info->peer->ntunnels; i++)
2174 tunnel_add_peer (path_info->peer->tunnels[i], path_info->peer);
2176 GNUNET_free (path_info);
2183 * Function to process paths received for a new peer addition. The recorded
2184 * paths form the initial tunnel, which can be optimized later.
2185 * Called on each result obtained for the DHT search.
2187 * @param cls closure
2188 * @param exp when will this value expire
2189 * @param key key of the result
2190 * @param get_path NULL-terminated array of pointers
2191 * to the peers on reverse GET path (or NULL if not recorded)
2192 * @param put_path NULL-terminated array of pointers
2193 * to the peers on the PUT path (or NULL if not recorded)
2194 * @param type type of the result
2195 * @param size number of bytes in data
2196 * @param data pointer to the result data
2199 dht_get_type_handler (void *cls, struct GNUNET_TIME_Absolute exp,
2200 const GNUNET_HashCode * key,
2201 const struct GNUNET_PeerIdentity *const *get_path,
2202 const struct GNUNET_PeerIdentity *const *put_path,
2203 enum GNUNET_BLOCK_Type type, size_t size,
2206 const struct GNUNET_PeerIdentity *pi = data;
2207 struct GNUNET_PeerIdentity id;
2208 struct MeshTunnel *t = cls;
2209 struct MeshPeerInfo *peer_info;
2210 struct MeshPathInfo *path_info;
2211 struct MeshPeerPath *p;
2214 if (size != sizeof (struct GNUNET_PeerIdentity))
2216 GNUNET_break_op (0);
2219 GNUNET_assert (NULL != t->client);
2220 GNUNET_DHT_get_stop (t->client->dht_get_type);
2221 t->client->dht_get_type = NULL;
2222 peer_info = peer_info_get (pi);
2223 GNUNET_CONTAINER_multihashmap_put (t->peers, &pi->hashPubKey, peer_info,
2224 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
2226 if ((NULL == get_path || NULL == put_path) && NULL == peer_info->path_head &&
2227 NULL == peer_info->dhtget)
2229 /* we don't have a route to the peer, let's try a direct lookup */
2230 peer_info->dhtget = GNUNET_DHT_get_start (dht_handle,
2232 GNUNET_TIME_UNIT_FOREVER_REL,
2234 GNUNET_BLOCK_TYPE_TEST,
2237 /* key to look up */
2239 /* replication level */
2240 GNUNET_DHT_RO_RECORD_ROUTE,
2241 /* option to dht: record route */
2242 NULL, /* bloom filter */
2245 0, /* xquery bits */
2248 peer_info); /* closure */
2251 p = path_build_from_dht (get_path, put_path);
2252 path_add_to_peer (peer_info, p);
2253 tunnel_add_peer(t, peer_info);
2254 p = tree_get_path_to_peer(t->tree, peer_info->id);
2256 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2257 "MESH: new route for tunnel 0x%x found, has %u hops\n",
2258 t->local_tid, p->length);
2259 for (i = 0; i < p->length; i++)
2261 GNUNET_PEER_resolve (p->peers[0], &id);
2262 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH:\t%d\t%s\n", i,
2263 GNUNET_h2s_full (&id.hashPubKey));
2269 path_info = GNUNET_malloc(sizeof(struct MeshPathInfo));
2271 path_info->peer = peer_info;
2272 path_info->path = p;
2273 GNUNET_PEER_resolve (p->peers[1], &id);
2274 GNUNET_CORE_notify_transmit_ready (core_handle,
2280 GNUNET_TIME_UNIT_FOREVER_REL,
2284 sizeof (struct GNUNET_MESH_ManipulatePath)
2287 sizeof (struct GNUNET_PeerIdentity)),
2289 &send_core_create_path,
2291 path_info); /* cls */
2295 send_client_peer_connected(t, myid);
2298 /******************************************************************************/
2299 /********************* MESH LOCAL HANDLES **************************/
2300 /******************************************************************************/
2304 * Handler for client disconnection
2306 * @param cls closure
2307 * @param client identification of the client; NULL
2308 * for the last call when the server is destroyed
2311 handle_local_client_disconnect (void *cls, struct GNUNET_SERVER_Client *client)
2313 struct MeshClient *c;
2314 struct MeshClient *next;
2316 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: client disconnected\n");
2318 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: (SERVER DOWN)\n");
2322 if (c->handle != client && NULL != client)
2324 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: ... searching\n");
2328 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: matching client found\n");
2329 if (NULL != c->tunnels)
2331 GNUNET_CONTAINER_multihashmap_iterate (c->tunnels,
2332 &tunnel_destroy_iterator,
2334 GNUNET_CONTAINER_multihashmap_destroy (c->tunnels);
2337 /* deregister clients applications */
2338 if (NULL != c->apps)
2340 GNUNET_CONTAINER_multihashmap_iterate (c->apps, &deregister_app, NULL);
2341 GNUNET_CONTAINER_multihashmap_destroy (c->apps);
2343 if (0 == GNUNET_CONTAINER_multihashmap_size (applications) &&
2344 GNUNET_SCHEDULER_NO_TASK != announce_applications_task)
2346 GNUNET_SCHEDULER_cancel (announce_applications_task);
2347 announce_applications_task = GNUNET_SCHEDULER_NO_TASK;
2349 if (NULL != c->types)
2350 GNUNET_CONTAINER_multihashmap_destroy (c->types);
2351 if (NULL != c->dht_get_type)
2352 GNUNET_DHT_get_stop (c->dht_get_type);
2353 GNUNET_CONTAINER_DLL_remove (clients, clients_tail, c);
2359 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: done!\n");
2365 * Handler for new clients
2367 * @param cls closure
2368 * @param client identification of the client
2369 * @param message the actual message, which includes messages the client wants
2372 handle_local_new_client (void *cls, struct GNUNET_SERVER_Client *client,
2373 const struct GNUNET_MessageHeader *message)
2375 struct GNUNET_MESH_ClientConnect *cc_msg;
2376 struct MeshClient *c;
2377 GNUNET_MESH_ApplicationType *a;
2384 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: new client connected\n");
2385 /* Check data sanity */
2386 size = ntohs (message->size) - sizeof (struct GNUNET_MESH_ClientConnect);
2387 cc_msg = (struct GNUNET_MESH_ClientConnect *) message;
2388 ntypes = ntohs (cc_msg->types);
2389 napps = ntohs (cc_msg->applications);
2391 ntypes * sizeof (uint16_t) + napps * sizeof (GNUNET_MESH_ApplicationType))
2394 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2398 /* Create new client structure */
2399 c = GNUNET_malloc (sizeof (struct MeshClient));
2401 c->id = next_client_id++;
2404 a = (GNUNET_MESH_ApplicationType *) &cc_msg[1];
2407 GNUNET_MESH_ApplicationType at;
2410 c->apps = GNUNET_CONTAINER_multihashmap_create (napps);
2411 for (i = 0; i < napps; i++)
2414 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: app type: %u\n", at);
2415 GNUNET_CRYPTO_hash (&at, sizeof (at), &hc);
2416 /* store in clients hashmap */
2417 GNUNET_CONTAINER_multihashmap_put (c->apps, &hc, c,
2418 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
2419 /* store in global hashmap, for announcements */
2420 GNUNET_CONTAINER_multihashmap_put (applications, &hc, c,
2421 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
2423 if (GNUNET_SCHEDULER_NO_TASK == announce_applications_task)
2424 announce_applications_task =
2425 GNUNET_SCHEDULER_add_now (&announce_applications, NULL);
2433 t = (uint16_t *) & a[napps];
2434 c->types = GNUNET_CONTAINER_multihashmap_create (ntypes);
2435 for (i = 0; i < ntypes; i++)
2438 GNUNET_CRYPTO_hash (&u16, sizeof (u16), &hc);
2440 /* store in clients hashmap */
2441 GNUNET_CONTAINER_multihashmap_put (c->types, &hc, c,
2442 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
2443 /* store in global hashmap */
2444 GNUNET_CONTAINER_multihashmap_put (types, &hc, c,
2445 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
2448 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2449 "MESH: client has %u+%u subscriptions\n", napps, ntypes);
2451 GNUNET_CONTAINER_DLL_insert (clients, clients_tail, c);
2452 c->tunnels = GNUNET_CONTAINER_multihashmap_create (32);
2453 GNUNET_SERVER_notification_context_add (nc, client);
2455 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2457 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: new client processed\n");
2463 * Handler for requests of new tunnels
2465 * @param cls closure
2466 * @param client identification of the client
2467 * @param message the actual message
2470 handle_local_tunnel_create (void *cls, struct GNUNET_SERVER_Client *client,
2471 const struct GNUNET_MessageHeader *message)
2473 struct GNUNET_MESH_TunnelMessage *t_msg;
2474 struct MeshTunnel *t;
2475 struct MeshClient *c;
2476 GNUNET_HashCode hash;
2478 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: new tunnel requested\n");
2480 /* Sanity check for client registration */
2481 if (NULL == (c = client_get (client)))
2484 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2488 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: by client %u\n", c->id);
2491 /* Message sanity check */
2492 if (sizeof (struct GNUNET_MESH_TunnelMessage) != ntohs (message->size))
2495 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2499 t_msg = (struct GNUNET_MESH_TunnelMessage *) message;
2500 /* Sanity check for tunnel numbering */
2501 if (0 == (ntohl (t_msg->tunnel_id) & GNUNET_MESH_LOCAL_TUNNEL_ID_CLI))
2504 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2507 /* Sanity check for duplicate tunnel IDs */
2508 if (NULL != tunnel_get_by_local_id (c, ntohl (t_msg->tunnel_id)))
2511 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2515 t = GNUNET_malloc (sizeof (struct MeshTunnel));
2516 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: CREATED TUNNEL at %p\n", t);
2517 while (NULL != tunnel_get_by_pi (myid, next_tid))
2518 next_tid = (next_tid + 1) & ~GNUNET_MESH_LOCAL_TUNNEL_ID_CLI;
2519 t->id.tid = next_tid++;
2521 t->local_tid = ntohl (t_msg->tunnel_id);
2523 t->peers = GNUNET_CONTAINER_multihashmap_create (32);
2525 GNUNET_CRYPTO_hash (&t->local_tid, sizeof (MESH_TunnelNumber), &hash);
2527 GNUNET_CONTAINER_multihashmap_put (c->tunnels, &hash, t,
2528 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
2531 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2535 GNUNET_CRYPTO_hash (&t->id, sizeof (struct MESH_TunnelID), &hash);
2537 GNUNET_CONTAINER_multihashmap_put (tunnels, &hash, t,
2538 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
2541 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2544 t->tree = tree_new (t, myid);
2545 t->tree->refresh = REFRESH_PATH_TIME;
2546 t->tree->root->status = MESH_PEER_READY;
2547 t->tree->me = t->tree->root;
2549 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2555 * Handler for requests of deleting tunnels
2557 * @param cls closure
2558 * @param client identification of the client
2559 * @param message the actual message
2562 handle_local_tunnel_destroy (void *cls, struct GNUNET_SERVER_Client *client,
2563 const struct GNUNET_MessageHeader *message)
2565 struct GNUNET_MESH_TunnelMessage *tunnel_msg;
2566 struct MeshClient *c;
2567 struct MeshTunnel *t;
2568 MESH_TunnelNumber tid;
2569 GNUNET_HashCode hash;
2571 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: destroying tunnel\n");
2573 /* Sanity check for client registration */
2574 if (NULL == (c = client_get (client)))
2577 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2580 /* Message sanity check */
2581 if (sizeof (struct GNUNET_MESH_TunnelMessage) != ntohs (message->size))
2584 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2588 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: by client %u\n", c->id);
2590 tunnel_msg = (struct GNUNET_MESH_TunnelMessage *) message;
2592 /* Retrieve tunnel */
2593 tid = ntohl (tunnel_msg->tunnel_id);
2595 /* Remove from local id hashmap */
2596 GNUNET_CRYPTO_hash (&tid, sizeof (MESH_TunnelNumber), &hash);
2597 t = GNUNET_CONTAINER_multihashmap_get (c->tunnels, &hash);
2598 GNUNET_CONTAINER_multihashmap_remove (c->tunnels, &hash, t);
2600 /* Remove from global id hashmap */
2601 GNUNET_CRYPTO_hash (&t->id, sizeof (struct MESH_TunnelID), &hash);
2602 GNUNET_CONTAINER_multihashmap_remove (tunnels, &hash, t);
2604 // notify_tunnel_destroy(t); FIXME
2606 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2612 * Handler for connection requests to new peers
2614 * @param cls closure
2615 * @param client identification of the client
2616 * @param message the actual message (PeerControl)
2619 handle_local_connect_add (void *cls, struct GNUNET_SERVER_Client *client,
2620 const struct GNUNET_MessageHeader *message)
2622 struct GNUNET_MESH_PeerControl *peer_msg;
2623 struct MeshClient *c;
2624 struct MeshTunnel *t;
2625 MESH_TunnelNumber tid;
2626 struct MeshPeerInfo *peer_info;
2629 /* Sanity check for client registration */
2630 if (NULL == (c = client_get (client)))
2633 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2637 peer_msg = (struct GNUNET_MESH_PeerControl *) message;
2638 /* Sanity check for message size */
2639 if (sizeof (struct GNUNET_MESH_PeerControl) != ntohs (peer_msg->header.size))
2642 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2646 /* Tunnel exists? */
2647 tid = ntohl (peer_msg->tunnel_id);
2648 t = tunnel_get_by_local_id (c, tid);
2652 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2656 /* Does client own tunnel? */
2657 if (t->client->handle != client)
2660 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2664 peer_info = peer_info_get (&peer_msg->peer);
2666 /* Start DHT search if needed, otherwise just add peer to tunnel. */
2667 if (NULL == peer_info->dhtget && NULL == peer_info->path_head)
2669 struct MeshPathInfo *path_info;
2671 path_info = GNUNET_malloc(sizeof(struct MeshPathInfo));
2672 path_info->peer = peer_info;
2674 peer_info->dhtget = GNUNET_DHT_get_start(dht_handle, /* handle */
2675 GNUNET_TIME_UNIT_FOREVER_REL, /* timeout */
2676 GNUNET_BLOCK_TYPE_TEST, /* type */
2677 &peer_msg->peer.hashPubKey, /*key to search */
2678 4, /* replication level */
2679 GNUNET_DHT_RO_RECORD_ROUTE,
2680 NULL, /* bloom filter */
2683 0, /* xquery bits */
2685 (void *) path_info);
2687 if (NULL != peer_info->path_head)
2689 tunnel_add_peer(t, peer_info);
2691 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2697 * Handler for disconnection requests of peers in a tunnel
2699 * @param cls closure
2700 * @param client identification of the client
2701 * @param message the actual message (PeerControl)
2704 handle_local_connect_del (void *cls, struct GNUNET_SERVER_Client *client,
2705 const struct GNUNET_MessageHeader *message)
2707 struct GNUNET_MESH_PeerControl *peer_msg;
2708 struct MeshClient *c;
2709 struct MeshTunnel *t;
2710 MESH_TunnelNumber tid;
2712 /* Sanity check for client registration */
2713 if (NULL == (c = client_get (client)))
2716 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2719 peer_msg = (struct GNUNET_MESH_PeerControl *) message;
2720 /* Sanity check for message size */
2721 if (sizeof (struct GNUNET_MESH_PeerControl) != ntohs (peer_msg->header.size))
2724 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2728 /* Tunnel exists? */
2729 tid = ntohl (peer_msg->tunnel_id);
2730 t = tunnel_get_by_local_id (c, tid);
2734 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2738 /* Does client own tunnel? */
2739 if (t->client->handle != client)
2742 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2746 /* Ok, delete peer from tunnel */
2747 GNUNET_CONTAINER_multihashmap_remove_all (t->peers,
2748 &peer_msg->peer.hashPubKey);
2750 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2756 * Handler for connection requests to new peers by type
2758 * @param cls closure
2759 * @param client identification of the client
2760 * @param message the actual message (ConnectPeerByType)
2763 handle_local_connect_by_type (void *cls, struct GNUNET_SERVER_Client *client,
2764 const struct GNUNET_MessageHeader *message)
2766 struct GNUNET_MESH_ConnectPeerByType *connect_msg;
2767 struct MeshClient *c;
2768 struct MeshTunnel *t;
2769 GNUNET_HashCode hash;
2770 GNUNET_MESH_ApplicationType type;
2771 MESH_TunnelNumber tid;
2773 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: got connect by type request\n");
2774 /* Sanity check for client registration */
2775 if (NULL == (c = client_get (client)))
2778 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2782 connect_msg = (struct GNUNET_MESH_ConnectPeerByType *) message;
2783 /* Sanity check for message size */
2784 if (sizeof (struct GNUNET_MESH_ConnectPeerByType) !=
2785 ntohs (connect_msg->header.size))
2788 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2792 /* Tunnel exists? */
2793 tid = ntohl (connect_msg->tunnel_id);
2794 t = tunnel_get_by_local_id (c, tid);
2798 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2802 /* Does client own tunnel? */
2803 if (t->client->handle != client)
2806 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2810 /* Do WE have the service? */
2811 type = ntohl (connect_msg->type);
2812 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: type requested: %u\n", type);
2813 GNUNET_CRYPTO_hash (&type, sizeof (GNUNET_MESH_ApplicationType), &hash);
2814 if (GNUNET_CONTAINER_multihashmap_contains (applications, &hash) ==
2817 /* Yes! Fast forward, add ourselves to the tunnel and send the
2818 * good news to the client
2820 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: available locally\n");
2821 GNUNET_CONTAINER_multihashmap_put (t->peers, &my_full_id.hashPubKey,
2822 peer_info_get (&my_full_id),
2823 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
2825 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: notifying client\n");
2826 send_client_peer_connected(t, myid);
2827 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Done\n");
2828 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2831 /* Ok, lets find a peer offering the service */
2832 if (c->dht_get_type)
2834 GNUNET_DHT_get_stop (c->dht_get_type);
2836 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: looking in DHT for %s\n",
2837 GNUNET_h2s_full (&hash));
2839 GNUNET_DHT_get_start (dht_handle, GNUNET_TIME_UNIT_FOREVER_REL,
2840 GNUNET_BLOCK_TYPE_TEST, &hash, 10U,
2841 GNUNET_DHT_RO_RECORD_ROUTE, NULL, 0, NULL, 0,
2842 &dht_get_type_handler, t);
2844 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2850 * Handler for client traffic directed to one peer
2852 * @param cls closure
2853 * @param client identification of the client
2854 * @param message the actual message
2857 handle_local_unicast (void *cls, struct GNUNET_SERVER_Client *client,
2858 const struct GNUNET_MessageHeader *message)
2860 struct MeshClient *c;
2861 struct MeshTunnel *t;
2862 struct MeshPeerInfo *pi;
2863 struct GNUNET_MESH_Unicast *data_msg;
2864 struct MeshDataDescriptor *info;
2865 MESH_TunnelNumber tid;
2868 /* Sanity check for client registration */
2869 if (NULL == (c = client_get (client)))
2872 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2875 data_msg = (struct GNUNET_MESH_Unicast *) message;
2876 /* Sanity check for message size */
2877 if (sizeof (struct GNUNET_MESH_Unicast) +
2878 sizeof (struct GNUNET_MessageHeader) > ntohs (data_msg->header.size))
2881 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2885 /* Tunnel exists? */
2886 tid = ntohl (data_msg->tid);
2887 t = tunnel_get_by_local_id (c, tid);
2891 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2895 /* Is it a local tunnel? Then, does client own the tunnel? */
2896 if (t->client->handle != NULL && t->client->handle != client)
2899 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2903 pi = GNUNET_CONTAINER_multihashmap_get (t->peers,
2904 &data_msg->destination.hashPubKey);
2905 /* Is the selected peer in the tunnel? */
2909 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2914 struct GNUNET_MESH_Unicast copy;
2916 /* Work around const limitation */
2917 memcpy (©, data_msg, sizeof (struct GNUNET_MESH_Unicast));
2918 copy.oid = my_full_id;
2919 copy.tid = htonl (t->id.tid);
2920 handle_mesh_data_unicast (NULL, &my_full_id, ©.header, NULL);
2923 data_size = ntohs (message->size) - sizeof (struct GNUNET_MESH_Unicast);
2924 info = GNUNET_malloc (sizeof (struct MeshDataDescriptor) + data_size);
2925 memcpy (&info[1], &data_msg[1], data_size);
2926 info->destination = pi->id;
2927 info->origin = &t->id;
2928 info->size = data_size;
2929 info->client = client;
2930 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0,
2931 GNUNET_TIME_UNIT_FOREVER_REL,
2932 path_get_first_hop (t->tree, pi->id),
2933 /* FIXME re-check types */
2935 sizeof (struct GNUNET_MESH_Unicast),
2936 &send_core_data_unicast, info);
2941 * Handler for client traffic directed to all peers in a tunnel
2943 * @param cls closure
2944 * @param client identification of the client
2945 * @param message the actual message
2948 handle_local_multicast (void *cls, struct GNUNET_SERVER_Client *client,
2949 const struct GNUNET_MessageHeader *message)
2951 struct MeshClient *c;
2952 struct MeshTunnel *t;
2953 struct GNUNET_MESH_Multicast *data_msg;
2954 MESH_TunnelNumber tid;
2956 /* Sanity check for client registration */
2957 if (NULL == (c = client_get (client)))
2960 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2963 data_msg = (struct GNUNET_MESH_Multicast *) message;
2964 /* Sanity check for message size */
2965 if (sizeof (struct GNUNET_MESH_PeerControl) != ntohs (data_msg->header.size))
2968 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2972 /* Tunnel exists? */
2973 tid = ntohl (data_msg->tid);
2974 t = tunnel_get_by_local_id (c, tid);
2978 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2982 /* Does client own tunnel? */
2983 if (t->client->handle != client)
2986 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2992 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2997 * Functions to handle messages from clients
2999 static struct GNUNET_SERVER_MessageHandler client_handlers[] = {
3000 {&handle_local_new_client, NULL, GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT, 0},
3001 {&handle_local_tunnel_create, NULL,
3002 GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE,
3003 sizeof (struct GNUNET_MESH_TunnelMessage)},
3004 {&handle_local_tunnel_destroy, NULL,
3005 GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY,
3006 sizeof (struct GNUNET_MESH_TunnelMessage)},
3007 {&handle_local_connect_add, NULL,
3008 GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD,
3009 sizeof (struct GNUNET_MESH_PeerControl)},
3010 {&handle_local_connect_del, NULL,
3011 GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_DEL,
3012 sizeof (struct GNUNET_MESH_PeerControl)},
3013 {&handle_local_connect_by_type, NULL,
3014 GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD_BY_TYPE,
3015 sizeof (struct GNUNET_MESH_ConnectPeerByType)},
3016 {&handle_local_unicast, NULL,
3017 GNUNET_MESSAGE_TYPE_MESH_UNICAST, 0},
3018 {&handle_local_unicast, NULL,
3019 GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN, 0},
3020 {&handle_local_multicast, NULL,
3021 GNUNET_MESSAGE_TYPE_MESH_MULTICAST, 0},
3027 * To be called on core init/fail.
3029 * @param cls service closure
3030 * @param server handle to the server for this service
3031 * @param identity the public identity of this peer
3032 * @param publicKey the public key of this peer
3035 core_init (void *cls, struct GNUNET_CORE_Handle *server,
3036 const struct GNUNET_PeerIdentity *identity,
3037 const struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *publicKey)
3039 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Core init\n");
3040 core_handle = server;
3041 if (0 != memcmp(identity, &my_full_id, sizeof(my_full_id)) || NULL == server)
3043 GNUNET_log(GNUNET_ERROR_TYPE_ERROR, _("MESH: Wrong CORE service\n"));
3044 GNUNET_SCHEDULER_shutdown();
3050 * Method called whenever a given peer connects.
3052 * @param cls closure
3053 * @param peer peer identity this notification is about
3054 * @param atsi performance data for the connection
3057 core_connect (void *cls, const struct GNUNET_PeerIdentity *peer,
3058 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
3060 // GNUNET_PEER_Id pid;
3061 struct MeshPeerInfo *peer_info;
3062 struct MeshPeerPath *path;
3064 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Peer connected\n");
3065 peer_info = peer_info_get (peer);
3066 if (myid == peer_info->id)
3068 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: (self)\n");
3071 path = path_new (2);
3072 path->peers[0] = myid;
3073 path->peers[1] = peer_info->id;
3074 path_add_to_peer (peer_info, path);
3079 * Method called whenever a peer disconnects.
3081 * @param cls closure
3082 * @param peer peer identity this notification is about
3085 core_disconnect (void *cls, const struct GNUNET_PeerIdentity *peer)
3087 struct MeshPeerInfo *pi;
3090 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Peer disconnected\n");
3091 pi = GNUNET_CONTAINER_multihashmap_get (peers, &peer->hashPubKey);
3097 for (i = 0; i < CORE_QUEUE_SIZE; i++)
3099 if (pi->core_transmit[i])
3101 GNUNET_CORE_notify_transmit_ready_cancel (pi->core_transmit[i]);
3102 /* TODO: notify that tranmission has failed */
3103 GNUNET_free (pi->infos[i]);
3106 path_remove_from_peer (pi, pi->id, myid);
3109 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: (self)\n");
3115 /******************************************************************************/
3116 /************************ MAIN FUNCTIONS ****************************/
3117 /******************************************************************************/
3120 * Task run during shutdown.
3126 shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
3128 struct MeshClient *c;
3130 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: shutting down\n");
3131 if (core_handle != NULL)
3133 GNUNET_CORE_disconnect (core_handle);
3136 if (dht_handle != NULL)
3138 for (c = clients; NULL != c; c = c->next)
3139 if (NULL != c->dht_get_type)
3140 GNUNET_DHT_get_stop (c->dht_get_type);
3141 GNUNET_DHT_disconnect (dht_handle);
3146 GNUNET_SERVER_notification_context_destroy (nc);
3149 if (GNUNET_SCHEDULER_NO_TASK != announce_id_task)
3151 GNUNET_SCHEDULER_cancel (announce_id_task);
3152 announce_id_task = GNUNET_SCHEDULER_NO_TASK;
3154 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: shut down\n");
3158 * Process mesh requests.
3160 * @param cls closure
3161 * @param server the initialized server
3162 * @param c configuration to use
3165 run (void *cls, struct GNUNET_SERVER_Handle *server,
3166 const struct GNUNET_CONFIGURATION_Handle *c)
3168 struct MeshPeerInfo *peer;
3169 struct MeshPeerPath *p;
3172 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: starting to run\n");
3173 server_handle = server;
3174 core_handle = GNUNET_CORE_connect (c, /* Main configuration */
3175 CORE_QUEUE_SIZE, /* queue size */
3176 NULL, /* Closure passed to MESH functions */
3177 &core_init, /* Call core_init once connected */
3178 &core_connect, /* Handle connects */
3179 &core_disconnect, /* remove peers on disconnects */
3180 NULL, /* Do we care about "status" updates? */
3181 NULL, /* Don't notify about all incoming messages */
3182 GNUNET_NO, /* For header only in notification */
3183 NULL, /* Don't notify about all outbound messages */
3184 GNUNET_NO, /* For header-only out notification */
3185 core_handlers); /* Register these handlers */
3186 if (core_handle == NULL)
3189 GNUNET_SCHEDULER_shutdown ();
3194 GNUNET_CONFIGURATION_get_value_filename (c, "GNUNETD", "HOSTKEY",
3197 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3199 ("Mesh service is lacking key configuration settings. Exiting.\n"));
3200 GNUNET_SCHEDULER_shutdown ();
3203 my_private_key = GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
3204 GNUNET_free (keyfile);
3205 if (my_private_key == NULL)
3207 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3208 _("Mesh service could not access hostkey. Exiting.\n"));
3209 GNUNET_SCHEDULER_shutdown ();
3212 GNUNET_CRYPTO_rsa_key_get_public (my_private_key, &my_public_key);
3213 GNUNET_CRYPTO_hash (&my_public_key, sizeof (my_public_key),
3214 &my_full_id.hashPubKey);
3215 myid = GNUNET_PEER_intern (&my_full_id);
3217 dht_handle = GNUNET_DHT_connect (c, 64);
3218 if (dht_handle == NULL)
3220 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Error connecting to DHT.\
3221 Running without DHT has a severe\
3222 impact in MESH capabilities.\n\
3223 Plase check your configuretion and enable DHT.\n");
3229 tunnels = GNUNET_CONTAINER_multihashmap_create (32);
3230 peers = GNUNET_CONTAINER_multihashmap_create (32);
3231 applications = GNUNET_CONTAINER_multihashmap_create (32);
3232 types = GNUNET_CONTAINER_multihashmap_create (32);
3234 GNUNET_SERVER_add_handlers (server_handle, client_handlers);
3235 nc = GNUNET_SERVER_notification_context_create (server_handle,
3237 GNUNET_SERVER_disconnect_notify (server_handle,
3238 &handle_local_client_disconnect,
3243 clients_tail = NULL;
3248 announce_applications_task = GNUNET_SCHEDULER_NO_TASK;
3249 announce_id_task = GNUNET_SCHEDULER_add_now (&announce_id, cls);
3251 /* Create a peer_info for the local peer */
3252 peer = peer_info_get(&my_full_id);
3255 path_add_to_peer(peer, p);
3257 /* Scheduled the task to clean up when shutdown is called */
3258 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &shutdown_task,
3261 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: end of run()\n");
3265 * The main function for the mesh service.
3267 * @param argc number of arguments from the command line
3268 * @param argv command line arguments
3269 * @return 0 ok, 1 on error
3272 main (int argc, char *const *argv)
3277 fprintf (stderr, "main ()\n");
3279 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: main()\n");
3282 GNUNET_SERVICE_run (argc, argv, "mesh", GNUNET_SERVICE_OPTION_NONE, &run,
3284 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: main() END\n");
3286 fprintf (stderr, "main () END\n");