2 This file is part of GNUnet.
3 (C) 2001-2013 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
27 * - keep queues until receiving ACK
30 * - relay corking down to core
31 * - set ttl relative to path length
39 #include "mesh_protocol.h"
40 #include "mesh_path.h"
41 #include "block_mesh.h"
42 #include "gnunet_dht_service.h"
43 #include "gnunet_statistics_service.h"
45 #define MESH_BLOOM_SIZE 128
47 #define MESH_DEBUG_DHT GNUNET_NO
48 #define MESH_DEBUG_CONNECTION GNUNET_NO
49 #define MESH_DEBUG_TIMING __LINUX__ && GNUNET_NO
51 #define MESH_MAX_POLL_TIME GNUNET_TIME_relative_multiply (\
52 GNUNET_TIME_UNIT_MINUTES,\
55 #if MESH_DEBUG_CONNECTION
56 #define DEBUG_CONN(...) GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, __VA_ARGS__)
58 #define DEBUG_CONN(...)
62 #define DEBUG_DHT(...) GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, __VA_ARGS__)
64 #define DEBUG_DHT(...)
71 struct timespec __mesh_start;
72 struct timespec __mesh_end;
73 #define INTERVAL_START clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &(__mesh_start))
74 #define INTERVAL_END \
76 clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &(__mesh_end));\
77 double __diff = __mesh_end.tv_nsec - __mesh_start.tv_nsec;\
78 if (__diff < 0) __diff += 1000000000;\
82 #define INTERVAL_SHOW \
84 GNUNET_log (GNUNET_ERROR_TYPE_INFO, "AVG process time: %f ns\n", __sum/__count)
86 #define INTERVAL_START
91 /******************************************************************************/
92 /************************ DATA STRUCTURES ****************************/
93 /******************************************************************************/
95 /** FWD declaration */
101 * Struct containing info about a queued transmission to this peer
108 struct MeshPeerQueue *next;
113 struct MeshPeerQueue *prev;
116 * Peer this transmission is directed to.
118 struct MeshPeerInfo *peer;
121 * Tunnel this message belongs to.
123 struct MeshTunnel *tunnel;
126 * Pointer to info stucture used as cls.
136 * Size of the message
143 * Struct containing all information regarding a given peer
153 * Last time we heard from this peer
155 struct GNUNET_TIME_Absolute last_contact;
158 * Number of attempts to reconnect so far
160 int n_reconnect_attempts;
163 * Paths to reach the peer, ordered by ascending hop count
165 struct MeshPeerPath *path_head;
168 * Paths to reach the peer, ordered by ascending hop count
170 struct MeshPeerPath *path_tail;
173 * Handle to stop the DHT search for a path to this peer
175 struct GNUNET_DHT_GetHandle *dhtget;
178 * Array of tunnels this peer is the target of.
179 * Most probably a small amount, therefore not a hashmap.
180 * When the path to the peer changes, notify these tunnels to let them
181 * re-adjust their path trees.
183 struct MeshTunnel **tunnels;
186 * Number of tunnels this peers participates in
188 unsigned int ntunnels;
191 * Transmission queue to core DLL head
193 struct MeshPeerQueue *queue_head;
196 * Transmission queue to core DLL tail
198 struct MeshPeerQueue *queue_tail;
201 * How many messages are in the queue to this peer.
203 unsigned int queue_n;
206 * Handle for queued transmissions
208 struct GNUNET_CORE_TransmitHandle *core_transmit;
213 * Struct to encapsulate all the Flow Control information to a peer in the
214 * context of a tunnel: Same peer in different tunnels will have independent
215 * flow control structures, allowing to choke/free tunnels according to its
218 struct MeshFlowControl
221 * ID of the last packet sent towards the peer.
223 uint32_t last_pid_sent;
226 * ID of the last packet received from the peer.
228 uint32_t last_pid_recv;
231 * Last ACK sent to the peer (peer can't send more than this PID).
233 uint32_t last_ack_sent;
236 * Last ACK sent towards the origin (for traffic towards leaf node).
238 uint32_t last_ack_recv;
241 * How many payload messages are in the queue towards this peer.
246 * Task to poll the peer in case of a lost ACK causes stall.
248 GNUNET_SCHEDULER_TaskIdentifier poll_task;
251 * How frequently to poll for ACKs.
253 struct GNUNET_TIME_Relative poll_time;
256 * On which tunnel to poll.
257 * Using an explicit poll_ctx would not help memory wise,
258 * since the allocated context would have to be stored in the
259 * fc struct in order to free it upon cancelling poll_task.
261 struct MeshTunnel *t;
266 * Globally unique tunnel identification (owner + number)
267 * DO NOT USE OVER THE NETWORK
272 * Node that owns the tunnel
277 * Tunnel number to differentiate all the tunnels owned by the node oid
278 * ( tid < GNUNET_MESH_LOCAL_TUNNEL_ID_CLI )
280 MESH_TunnelNumber tid;
285 * Info needed to retry a message in case it gets lost.
287 struct MeshSentMessage {
290 * Tunnel this message is in.
292 struct MeshTunnel *t;
295 * ID of the message (ACK needed to free)
300 * Task to resend/poll in case no ACK is received.
302 GNUNET_SCHEDULER_TaskIdentifier retry_task; // FIXME move to per tunnel timer?
305 * Counter for exponential backoff.
307 struct GNUNET_TIME_Relative retry_timer;
310 * Is this a forward or backward going message?
314 /* struct GNUNET_MESH_Data with payload */
318 * Struct containing all information regarding a tunnel
319 * For an intermediate node the improtant info used will be:
320 * - id Tunnel unique identification
321 * - paths[0] To know where to send it next
322 * - metainfo: ready, speeds, accounting
329 struct MESH_TunnelID id;
332 * Port of the tunnel.
337 * State of the tunnel.
339 enum MeshTunnelState state;
342 * Local tunnel number ( >= GNUNET_MESH_LOCAL_TUNNEL_ID_CLI or 0 )
344 MESH_TunnelNumber local_tid;
347 * Local tunnel number for local destination clients (incoming number)
348 * ( >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV or 0). All clients share the same
351 MESH_TunnelNumber local_tid_dest;
354 * Is the tunnel bufferless (minimum latency)?
359 * Is the tunnel reliable?
364 * Force sending ACK? Flag to allow duplicate ACK on POLL.
369 * How many messages do we accept in the forward queue.
371 unsigned int queue_max;
374 * Last time the tunnel was used
376 struct GNUNET_TIME_Absolute timestamp;
379 * Destination of the tunnel.
384 * Next hop in the tunnel. If 0, @c client must be set.
386 GNUNET_PEER_Id next_hop;
389 * Previous hop in the tunnel. If 0, @c owner must be set.
391 GNUNET_PEER_Id prev_hop;
394 * Flow control information about @c next_hop or @c client.
396 struct MeshFlowControl next_fc;
399 * Flow control information about @c prev_hop or @c owner.
401 struct MeshFlowControl prev_fc;
404 * Client owner of the tunnel, if any
406 struct MeshClient *owner;
409 * Client destination of the tunnel, if any.
411 struct MeshClient *client;
414 * Task to keep the used paths alive at the owner,
415 * time tunnel out on all the other peers.
417 GNUNET_SCHEDULER_TaskIdentifier maintenance_task;
420 * Path being used for the tunnel.
422 struct MeshPeerPath *path;
425 * Flag to signal the destruction of the tunnel.
426 * If this is set GNUNET_YES the tunnel will be destroyed
427 * when the queue is empty.
432 * Total messages pending for this tunnels, payload or not.
434 unsigned int pending_messages;
437 * Messages sent and not yet ACK'd.
438 * Only present (non-NULL) at the owner of a tunnel.
440 struct GNUNET_CONTAINER_MultiHashMap32 *sent_messages_fwd;
443 * Messages sent and not yet ACK'd.
444 * Only present (non-NULL) at the destination of a tunnel.
446 struct GNUNET_CONTAINER_MultiHashMap32 *sent_messages_bck;
451 * Struct containing information about a client of the service
453 * TODO: add a list of 'waiting' ports
460 struct MeshClient *next;
465 struct MeshClient *prev;
468 * Tunnels that belong to this client, indexed by local id
470 struct GNUNET_CONTAINER_MultiHashMap *own_tunnels;
473 * Tunnels this client has accepted, indexed by incoming local id
475 struct GNUNET_CONTAINER_MultiHashMap *incoming_tunnels;
478 * Handle to communicate with the client
480 struct GNUNET_SERVER_Client *handle;
483 * Ports that this client has declared interest in.
484 * Indexed by a GMC_hash32 (type), contains *Client.
486 struct GNUNET_CONTAINER_MultiHashMap *ports;
489 * Whether the client is active or shutting down (don't send confirmations
490 * to a client that is shutting down.
495 * ID of the client, mainly for debug messages
502 /******************************************************************************/
503 /************************ DEBUG FUNCTIONS ****************************/
504 /******************************************************************************/
508 * GNUNET_SCHEDULER_Task for printing a message after some operation is done
509 * @param cls string to print
510 * @param success GNUNET_OK if the PUT was transmitted,
511 * GNUNET_NO on timeout,
512 * GNUNET_SYSERR on disconnect from service
513 * after the PUT message was transmitted
514 * (so we don't know if it was received or not)
519 mesh_debug (void *cls, int success)
523 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "%s (%d)\n", s, success);
528 unsigned int debug_fwd_ack;
529 unsigned int debug_bck_ack;
533 /******************************************************************************/
534 /*********************** GLOBAL VARIABLES ****************************/
535 /******************************************************************************/
537 /************************** Configuration parameters **************************/
540 * How often to send tunnel keepalives. Tunnels timeout after 4 missed.
542 static struct GNUNET_TIME_Relative refresh_path_time;
545 * How often to PUT own ID in the DHT.
547 static struct GNUNET_TIME_Relative id_announce_time;
550 * Maximum time allowed to connect to a peer found by string.
552 static struct GNUNET_TIME_Relative connect_timeout;
555 * Default TTL for payload packets.
557 static unsigned long long default_ttl;
560 * DHT replication level, see DHT API: GNUNET_DHT_get_start, GNUNET_DHT_put.
562 static unsigned long long dht_replication_level;
565 * How many tunnels are we willing to maintain.
566 * Local tunnels are always allowed, even if there are more tunnels than max.
568 static unsigned long long max_tunnels;
571 * How many messages *in total* are we willing to queue, divided by number of
572 * tunnels to get tunnel queue size.
574 static unsigned long long max_msgs_queue;
577 * How many peers do we want to remember?
579 static unsigned long long max_peers;
582 * Percentage of messages that will be dropped (for test purposes only).
584 static unsigned long long drop_percent;
586 /*************************** Static global variables **************************/
589 * Hostkey generation context
591 static struct GNUNET_CRYPTO_EccKeyGenerationContext *keygen;
594 * DLL with all the clients, head.
596 static struct MeshClient *clients_head;
599 * DLL with all the clients, tail.
601 static struct MeshClient *clients_tail;
604 * Tunnels known, indexed by MESH_TunnelID (MeshTunnel).
606 static struct GNUNET_CONTAINER_MultiHashMap *tunnels;
609 * Number of tunnels known.
611 static unsigned long long n_tunnels;
614 * Tunnels incoming, indexed by MESH_TunnelNumber
615 * (which is greater than GNUNET_MESH_LOCAL_TUNNEL_ID_SERV).
617 static struct GNUNET_CONTAINER_MultiHashMap *incoming_tunnels;
620 * Peers known, indexed by PeerIdentity (MeshPeerInfo).
622 static struct GNUNET_CONTAINER_MultiHashMap *peers;
625 * Handle to communicate with transport
627 // static struct GNUNET_TRANSPORT_Handle *transport_handle;
630 * Handle to communicate with core.
632 static struct GNUNET_CORE_Handle *core_handle;
637 static struct GNUNET_DHT_Handle *dht_handle;
642 static struct GNUNET_SERVER_Handle *server_handle;
645 * Handle to the statistics service.
647 static struct GNUNET_STATISTICS_Handle *stats;
650 * Notification context, to send messages to local clients.
652 static struct GNUNET_SERVER_NotificationContext *nc;
655 * Local peer own ID (memory efficient handle).
657 static GNUNET_PEER_Id myid;
660 * Local peer own ID (full value).
662 static struct GNUNET_PeerIdentity my_full_id;
667 static struct GNUNET_CRYPTO_EccPrivateKey *my_private_key;
672 static struct GNUNET_CRYPTO_EccPublicKeyBinaryEncoded my_public_key;
675 * Tunnel ID for the next created tunnel (global tunnel number).
677 static MESH_TunnelNumber next_tid;
680 * Tunnel ID for the next incoming tunnel (local tunnel number).
682 static MESH_TunnelNumber next_local_tid;
685 * All ports clients of this peer have opened.
687 static struct GNUNET_CONTAINER_MultiHashMap *ports;
690 * Task to periodically announce itself in the network.
692 GNUNET_SCHEDULER_TaskIdentifier announce_id_task;
695 * Next ID to assign to a client.
697 unsigned int next_client_id;
700 /******************************************************************************/
701 /*********************** DECLARATIONS **************************/
702 /******************************************************************************/
705 * Function to process paths received for a new peer addition. The recorded
706 * paths form the initial tunnel, which can be optimized later.
707 * Called on each result obtained for the DHT search.
710 * @param exp when will this value expire
711 * @param key key of the result
712 * @param type type of the result
713 * @param size number of bytes in data
714 * @param data pointer to the result data
717 dht_get_id_handler (void *cls, struct GNUNET_TIME_Absolute exp,
718 const struct GNUNET_HashCode * key,
719 const struct GNUNET_PeerIdentity *get_path,
720 unsigned int get_path_length,
721 const struct GNUNET_PeerIdentity *put_path,
722 unsigned int put_path_length, enum GNUNET_BLOCK_Type type,
723 size_t size, const void *data);
727 * Retrieve the MeshPeerInfo stucture associated with the peer, create one
728 * and insert it in the appropriate structures if the peer is not known yet.
730 * @param peer Full identity of the peer.
732 * @return Existing or newly created peer info.
734 static struct MeshPeerInfo *
735 peer_get (const struct GNUNET_PeerIdentity *peer);
739 * Retrieve the MeshPeerInfo stucture associated with the peer, create one
740 * and insert it in the appropriate structures if the peer is not known yet.
742 * @param peer Short identity of the peer.
744 * @return Existing or newly created peer info.
746 static struct MeshPeerInfo *
747 peer_get_short (const GNUNET_PEER_Id peer);
751 * Build a PeerPath from the paths returned from the DHT, reversing the paths
752 * to obtain a local peer -> destination path and interning the peer ids.
754 * @return Newly allocated and created path
756 static struct MeshPeerPath *
757 path_build_from_dht (const struct GNUNET_PeerIdentity *get_path,
758 unsigned int get_path_length,
759 const struct GNUNET_PeerIdentity *put_path,
760 unsigned int put_path_length);
764 * Adds a path to the peer_infos of all the peers in the path
766 * @param p Path to process.
767 * @param confirmed Whether we know if the path works or not.
770 path_add_to_peers (struct MeshPeerPath *p, int confirmed);
775 * Search for a tunnel by global ID using full PeerIdentities.
777 * @param oid owner of the tunnel.
778 * @param tid global tunnel number.
780 * @return tunnel handler, NULL if doesn't exist.
782 static struct MeshTunnel *
783 tunnel_get (const struct GNUNET_PeerIdentity *oid, MESH_TunnelNumber tid);
787 * Notify a tunnel that a connection has broken that affects at least
790 * @param t Tunnel affected.
791 * @param p1 Peer that got disconnected from p2.
792 * @param p2 Peer that got disconnected from p1.
794 * @return Short ID of the peer disconnected (either p1 or p2).
795 * 0 if the tunnel remained unaffected.
797 static GNUNET_PEER_Id
798 tunnel_notify_connection_broken (struct MeshTunnel *t, GNUNET_PEER_Id p1,
803 * @brief Use the given path for the tunnel.
804 * Update the next and prev hops (and RCs).
805 * (Re)start the path refresh in case the tunnel is locally owned.
807 * @param t Tunnel to update.
808 * @param p Path to use.
811 tunnel_use_path (struct MeshTunnel *t, struct MeshPeerPath *p);
814 * Tunnel is empty: destroy it.
816 * Notifies all participants (peers, cleints) about the destruction.
818 * @param t Tunnel to destroy.
821 tunnel_destroy_empty (struct MeshTunnel *t);
824 * @brief Queue and pass message to core when possible.
826 * If type is payload (UNICAST, TO_ORIGIN, MULTICAST) checks for queue status
827 * and accounts for it. In case the queue is full, the message is dropped and
830 * Otherwise, message is treated as internal and allowed to go regardless of
833 * @param cls Closure (@c type dependant). It will be used by queue_send to
834 * build the message to be sent if not already prebuilt.
835 * @param type Type of the message, 0 for a raw message.
836 * @param size Size of the message.
837 * @param dst Neighbor to send message to.
838 * @param t Tunnel this message belongs to.
841 queue_add (void *cls, uint16_t type, size_t size,
842 struct MeshPeerInfo *dst, struct MeshTunnel *t);
846 * Free a transmission that was already queued with all resources
847 * associated to the request.
849 * @param queue Queue handler to cancel.
850 * @param clear_cls Is it necessary to free associated cls?
853 queue_destroy (struct MeshPeerQueue *queue, int clear_cls);
857 * @brief Get the next transmittable message from the queue.
859 * This will be the head, except in the case of being a data packet
860 * not allowed by the destination peer.
862 * @param peer Destination peer.
864 * @return The next viable MeshPeerQueue element to send to that peer.
865 * NULL when there are no transmittable messages.
867 struct MeshPeerQueue *
868 queue_get_next (const struct MeshPeerInfo *peer);
872 * Core callback to write a queued packet to core buffer
874 * @param cls Closure (peer info).
875 * @param size Number of bytes available in buf.
876 * @param buf Where the to write the message.
878 * @return number of bytes written to buf
881 queue_send (void *cls, size_t size, void *buf);
884 /******************************************************************************/
885 /************************ PERIODIC FUNCTIONS ****************************/
886 /******************************************************************************/
889 * Periodically announce self id in the DHT
892 * @param tc task context
895 announce_id (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
899 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
901 announce_id_task = GNUNET_SCHEDULER_NO_TASK;
905 * - Set data expiration in function of X
908 DEBUG_DHT ("DHT_put for ID %s started.\n", GNUNET_i2s (&my_full_id));
910 block.id = my_full_id;
911 GNUNET_DHT_put (dht_handle, /* DHT handle */
912 &my_full_id.hashPubKey, /* Key to use */
913 dht_replication_level, /* Replication level */
914 GNUNET_DHT_RO_RECORD_ROUTE | GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE, /* DHT options */
915 GNUNET_BLOCK_TYPE_MESH_PEER, /* Block type */
916 sizeof (block), /* Size of the data */
917 (const char *) &block, /* Data itself */
918 GNUNET_TIME_UNIT_FOREVER_ABS, /* Data expiration */
919 GNUNET_TIME_UNIT_FOREVER_REL, /* Retry time */
920 NULL, /* Continuation */
921 NULL); /* Continuation closure */
923 GNUNET_SCHEDULER_add_delayed (id_announce_time, &announce_id, cls);
927 /******************************************************************************/
928 /****************** GENERAL HELPER FUNCTIONS ************************/
929 /******************************************************************************/
933 * Check if client has registered with the service and has not disconnected
935 * @param client the client to check
937 * @return non-NULL if client exists in the global DLL
939 static struct MeshClient *
940 client_get (struct GNUNET_SERVER_Client *client)
942 struct MeshClient *c;
947 if (c->handle == client)
956 * Deletes a tunnel from a client (either owner or destination). To be used on
959 * @param c Client whose tunnel to delete.
960 * @param t Tunnel which should be deleted.
963 client_delete_tunnel (struct MeshClient *c, struct MeshTunnel *t)
965 struct GNUNET_HashCode hash;
969 GMC_hash32 (t->local_tid, &hash);
970 GNUNET_assert (GNUNET_YES ==
971 GNUNET_CONTAINER_multihashmap_remove (c->own_tunnels,
975 else if (c == t->client)
977 GMC_hash32 (t->local_tid_dest, &hash);
978 GNUNET_assert (GNUNET_YES ==
979 GNUNET_CONTAINER_multihashmap_remove (c->incoming_tunnels,
990 * Notify the appropriate client that a new incoming tunnel was created.
992 * @param t Tunnel that was created.
995 send_client_tunnel_create (struct MeshTunnel *t)
997 struct GNUNET_MESH_TunnelMessage msg;
999 if (NULL == t->client)
1001 msg.header.size = htons (sizeof (msg));
1002 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE);
1003 msg.tunnel_id = htonl (t->local_tid_dest);
1004 msg.port = htonl (t->port);
1005 GNUNET_PEER_resolve (t->id.oid, &msg.peer);
1006 GNUNET_SERVER_notification_context_unicast (nc, t->client->handle,
1007 &msg.header, GNUNET_NO);
1012 * Notify dest client that the incoming tunnel is no longer valid.
1014 * @param c Client to notify..
1015 * @param t Tunnel that is destroyed.
1018 send_client_tunnel_destroy (struct MeshClient *c, struct MeshTunnel *t)
1020 struct GNUNET_MESH_TunnelMessage msg;
1027 if (c != t->client && c != t->owner)
1032 msg.header.size = htons (sizeof (msg));
1033 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY);
1034 msg.tunnel_id = htonl (t->local_tid_dest);
1035 msg.port = htonl (0);
1036 memset(&msg.peer, 0, sizeof (msg.peer));
1037 GNUNET_SERVER_notification_context_unicast (nc, c->handle,
1038 &msg.header, GNUNET_NO);
1043 * Iterator over all the peers to remove the oldest not-used entry.
1045 * @param cls Closure (unsued).
1046 * @param key ID of the peer.
1047 * @param value Peer_Info of the peer.
1052 peer_info_timeout (void *cls,
1053 const struct GNUNET_HashCode *key,
1060 * Retrieve the MeshPeerInfo stucture associated with the peer, create one
1061 * and insert it in the appropriate structures if the peer is not known yet.
1063 * @param peer Full identity of the peer.
1065 * @return Existing or newly created peer info.
1067 static struct MeshPeerInfo *
1068 peer_get (const struct GNUNET_PeerIdentity *peer)
1070 struct MeshPeerInfo *peer_info;
1072 peer_info = GNUNET_CONTAINER_multihashmap_get (peers, &peer->hashPubKey);
1073 if (NULL == peer_info)
1076 (struct MeshPeerInfo *) GNUNET_malloc (sizeof (struct MeshPeerInfo));
1077 if (GNUNET_CONTAINER_multihashmap_size (peers) > max_peers)
1079 GNUNET_CONTAINER_multihashmap_iterate (peers,
1083 GNUNET_CONTAINER_multihashmap_put (peers, &peer->hashPubKey, peer_info,
1084 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST);
1085 peer_info->id = GNUNET_PEER_intern (peer);
1087 peer_info->last_contact = GNUNET_TIME_absolute_get();
1094 * Retrieve the MeshPeerInfo stucture associated with the peer, create one
1095 * and insert it in the appropriate structures if the peer is not known yet.
1097 * @param peer Short identity of the peer.
1099 * @return Existing or newly created peer info.
1101 static struct MeshPeerInfo *
1102 peer_get_short (const GNUNET_PEER_Id peer)
1104 struct GNUNET_PeerIdentity id;
1106 GNUNET_PEER_resolve (peer, &id);
1107 return peer_get (&id);
1112 * Choose the best path towards a peer considering the tunnel properties.
1114 * @param peer The destination peer.
1115 * @param t The tunnel the path is for.
1117 * @return Best current known path towards the peer, if any.
1119 static struct MeshPeerPath *
1120 peer_get_best_path (const struct MeshPeerInfo *peer, const struct MeshTunnel *t)
1122 struct MeshPeerPath *best_p;
1123 struct MeshPeerPath *p;
1124 unsigned int best_cost;
1127 best_p = p = peer->path_head;
1128 best_cost = cost = p->length;
1131 if ((cost = p->length) < best_cost)
1142 * Core callback to write a pre-constructed data packet to core buffer
1144 * @param cls Closure (MeshTransmissionDescriptor with data in "data" member).
1145 * @param size Number of bytes available in buf.
1146 * @param buf Where the to write the message.
1148 * @return number of bytes written to buf
1151 send_core_data_raw (void *cls, size_t size, void *buf)
1153 struct GNUNET_MessageHeader *msg = cls;
1156 GNUNET_assert (NULL != msg);
1157 total_size = ntohs (msg->size);
1159 if (total_size > size)
1164 memcpy (buf, msg, total_size);
1171 * Sends an already built message to a peer, properly registrating
1172 * all used resources.
1174 * @param message Message to send. Function makes a copy of it.
1175 * @param peer Short ID of the neighbor whom to send the message.
1176 * @param t Tunnel on which this message is transmitted.
1179 send_prebuilt_message (const struct GNUNET_MessageHeader *message,
1180 GNUNET_PEER_Id peer,
1181 struct MeshTunnel *t)
1183 struct GNUNET_PeerIdentity id;
1184 struct MeshPeerInfo *neighbor;
1185 struct MeshPeerPath *p;
1190 // GNUNET_TRANSPORT_try_connect(); FIXME use?
1195 size = ntohs (message->size);
1196 data = GNUNET_malloc (size);
1197 memcpy (data, message, size);
1198 type = ntohs(message->type);
1199 if (GNUNET_MESSAGE_TYPE_MESH_UNICAST == type ||
1200 GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN == type)
1202 struct GNUNET_MESH_Data *u;
1204 u = (struct GNUNET_MESH_Data *) data;
1205 u->ttl = htonl (ntohl (u->ttl) - 1);
1207 GNUNET_PEER_resolve (peer, &id);
1208 neighbor = peer_get (&id);
1209 for (p = neighbor->path_head; NULL != p; p = p->next)
1219 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1220 " %s IS NOT DIRECTLY CONNECTED\n",
1222 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1225 for (p = neighbor->path_head; NULL != p; p = p->next)
1227 struct GNUNET_PeerIdentity debug_id;
1230 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1231 " path with %u hops through:\n",
1233 for (i = 0; i < p->length; i++)
1235 GNUNET_PEER_resolve(p->peers[i], &debug_id);
1236 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1238 i, GNUNET_i2s(&debug_id));
1242 GNUNET_break (0); // FIXME sometimes fails (testing disconnect?)
1243 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1244 " no direct connection to %s\n",
1249 if (GNUNET_MESSAGE_TYPE_MESH_PATH_ACK == type)
1260 * Sends a CREATE PATH message for a path to a peer, properly registrating
1261 * all used resources.
1263 * @param t Tunnel for which the path is created.
1266 send_create_path (struct MeshTunnel *t)
1268 struct MeshPeerInfo *neighbor;
1270 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Send create path\n");
1271 neighbor = peer_get_short (t->next_hop);
1273 GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE,
1274 sizeof (struct GNUNET_MESH_CreateTunnel) +
1275 (t->path->length * sizeof (struct GNUNET_PeerIdentity)),
1278 t->state = MESH_TUNNEL_WAITING;
1283 * Sends a PATH ACK message in reponse to a received PATH_CREATE directed to us.
1285 * @param t Tunnel which to confirm.
1288 send_path_ack (struct MeshTunnel *t)
1290 struct MeshPeerInfo *peer;
1292 peer = peer_get_short (t->prev_hop);
1295 GNUNET_MESSAGE_TYPE_MESH_PATH_ACK,
1296 sizeof (struct GNUNET_MESH_PathACK),
1303 * Try to establish a new connection to this peer in the given tunnel.
1304 * If the peer doesn't have any path to it yet, try to get one.
1305 * If the peer already has some path, send a CREATE PATH towards it.
1307 * @param peer PeerInfo of the peer.
1308 * @param t Tunnel for which to create the path, if possible.
1311 peer_connect (struct MeshPeerInfo *peer, struct MeshTunnel *t)
1313 struct MeshPeerPath *p;
1315 if (NULL != peer->path_head)
1317 p = peer_get_best_path (peer, t);
1318 tunnel_use_path (t, p);
1319 send_create_path (t);
1321 else if (NULL == peer->dhtget)
1323 struct GNUNET_PeerIdentity id;
1325 GNUNET_PEER_resolve (peer->id, &id);
1326 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1327 " Starting DHT GET for peer %s\n", GNUNET_i2s (&id));
1328 peer->dhtget = GNUNET_DHT_get_start (dht_handle, /* handle */
1329 GNUNET_BLOCK_TYPE_MESH_PEER, /* type */
1330 &id.hashPubKey, /* key to search */
1331 dht_replication_level, /* replication level */
1332 GNUNET_DHT_RO_RECORD_ROUTE |
1333 GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE,
1335 0, /* xquery bits */
1336 &dht_get_id_handler, peer);
1337 t->state = MESH_TUNNEL_SEARCHING;
1341 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1342 "There is no path but the DHT GET is already started.\n");
1348 * Destroy the peer_info and free any allocated resources linked to it
1350 * @param pi The peer_info to destroy.
1352 * @return GNUNET_OK on success
1355 peer_info_destroy (struct MeshPeerInfo *pi)
1357 struct GNUNET_PeerIdentity id;
1358 struct MeshPeerPath *p;
1359 struct MeshPeerPath *nextp;
1362 GNUNET_PEER_resolve (pi->id, &id);
1363 GNUNET_PEER_change_rc (pi->id, -1);
1366 GNUNET_CONTAINER_multihashmap_remove (peers, &id.hashPubKey, pi))
1369 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1370 "removing peer %s, not in hashmap\n", GNUNET_i2s (&id));
1372 if (NULL != pi->dhtget)
1374 GNUNET_DHT_get_stop (pi->dhtget);
1380 GNUNET_CONTAINER_DLL_remove (pi->path_head, pi->path_tail, p);
1384 for (i = 0; i < pi->ntunnels; i++)
1385 tunnel_destroy_empty (pi->tunnels[i]);
1386 GNUNET_array_grow (pi->tunnels, pi->ntunnels, 0);
1393 * Remove all paths that rely on a direct connection between p1 and p2
1394 * from the peer itself and notify all tunnels about it.
1396 * @param peer PeerInfo of affected peer.
1397 * @param p1 GNUNET_PEER_Id of one peer.
1398 * @param p2 GNUNET_PEER_Id of another peer that was connected to the first and
1401 * TODO: optimize (see below)
1404 peer_remove_path (struct MeshPeerInfo *peer, GNUNET_PEER_Id p1,
1407 struct MeshPeerPath *p;
1408 struct MeshPeerPath *next;
1409 struct MeshPeerInfo *peer_d;
1411 unsigned int destroyed;
1414 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "peer_info_remove_path\n");
1416 for (p = peer->path_head; NULL != p; p = next)
1419 for (i = 0; i < (p->length - 1); i++)
1421 if ((p->peers[i] == p1 && p->peers[i + 1] == p2) ||
1422 (p->peers[i] == p2 && p->peers[i + 1] == p1))
1424 GNUNET_CONTAINER_DLL_remove (peer->path_head, peer->path_tail, p);
1434 for (i = 0; i < peer->ntunnels; i++)
1436 d = tunnel_notify_connection_broken (peer->tunnels[i], p1, p2);
1440 peer_d = peer_get_short (d);
1441 next = peer_get_best_path (peer_d, peer->tunnels[i]);
1442 tunnel_use_path (peer->tunnels[i], next);
1443 peer_connect (peer_d, peer->tunnels[i]);
1445 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "peer_info_remove_path END\n");
1450 * Add the path to the peer and update the path used to reach it in case this
1453 * @param peer_info Destination peer to add the path to.
1454 * @param path New path to add. Last peer must be the peer in arg 1.
1455 * Path will be either used of freed if already known.
1456 * @param trusted Do we trust that this path is real?
1459 peer_info_add_path (struct MeshPeerInfo *peer_info, struct MeshPeerPath *path,
1462 struct MeshPeerPath *aux;
1466 if ((NULL == peer_info) || (NULL == path))
1469 path_destroy (path);
1472 if (path->peers[path->length - 1] != peer_info->id)
1475 path_destroy (path);
1478 if (2 >= path->length && GNUNET_NO == trusted)
1480 /* Only allow CORE to tell us about direct paths */
1481 path_destroy (path);
1484 for (l = 1; l < path->length; l++)
1486 if (path->peers[l] == myid)
1488 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "shortening path by %u\n", l);
1489 for (l2 = 0; l2 < path->length - l; l2++)
1491 path->peers[l2] = path->peers[l + l2];
1496 GNUNET_realloc (path->peers, path->length * sizeof (GNUNET_PEER_Id));
1501 struct GNUNET_PeerIdentity id;
1503 GNUNET_PEER_resolve (peer_info->id, &id);
1504 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "adding path [%u] to peer %s\n",
1505 path->length, GNUNET_i2s (&id));
1508 l = path_get_length (path);
1511 path_destroy (path);
1515 GNUNET_assert (peer_info->id == path->peers[path->length - 1]);
1516 for (aux = peer_info->path_head; aux != NULL; aux = aux->next)
1518 l2 = path_get_length (aux);
1521 GNUNET_CONTAINER_DLL_insert_before (peer_info->path_head,
1522 peer_info->path_tail, aux, path);
1527 if (l2 == l && memcmp (path->peers, aux->peers, l) == 0)
1529 path_destroy (path);
1534 GNUNET_CONTAINER_DLL_insert_tail (peer_info->path_head, peer_info->path_tail,
1541 * Add the path to the origin peer and update the path used to reach it in case
1542 * this is the shortest.
1543 * The path is given in peer_info -> destination, therefore we turn the path
1544 * upside down first.
1546 * @param peer_info Peer to add the path to, being the origin of the path.
1547 * @param path New path to add after being inversed.
1548 * Path will be either used or freed.
1549 * @param trusted Do we trust that this path is real?
1552 peer_info_add_path_to_origin (struct MeshPeerInfo *peer_info,
1553 struct MeshPeerPath *path, int trusted)
1556 peer_info_add_path (peer_info, path, trusted);
1561 * Add a tunnel to the list of tunnels a peer participates in.
1562 * Update the tunnel's destination.
1564 * @param p Peer to add to.
1565 * @param t Tunnel to add.
1568 peer_info_add_tunnel (struct MeshPeerInfo *p, struct MeshTunnel *t)
1572 GNUNET_break (t->dest == p->id);
1576 GNUNET_PEER_change_rc (t->dest, 1);
1577 GNUNET_array_append (p->tunnels, p->ntunnels, t);
1582 * Remove a tunnel from the list of tunnels a peer participates in.
1583 * Free the tunnel's destination.
1585 * @param p Peer to clean.
1586 * @param t Tunnel to remove.
1589 peer_info_remove_tunnel (struct MeshPeerInfo *p, struct MeshTunnel *t)
1593 if (t->dest == p->id)
1595 GNUNET_PEER_change_rc (t->dest, -1);
1598 for (i = 0; i < p->ntunnels; i++)
1600 if (p->tunnels[i] == t)
1602 p->tunnels[i] = p->tunnels[p->ntunnels - 1];
1603 GNUNET_array_grow (p->tunnels, p->ntunnels, p->ntunnels - 1);
1611 * Function called if the connection to the peer has been stalled for a while,
1612 * possibly due to a missed ACK. Poll the peer about its ACK status.
1614 * @param cls Closure (poll ctx).
1615 * @param tc TaskContext.
1618 tunnel_poll (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1620 struct MeshFlowControl *fc = cls;
1621 struct GNUNET_MESH_Poll msg;
1622 struct MeshTunnel *t = fc->t;
1623 GNUNET_PEER_Id peer;
1625 fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
1626 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1631 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_POLL);
1632 msg.header.size = htons (sizeof (msg));
1633 msg.tid = htonl (t->id.tid);
1634 GNUNET_PEER_resolve (t->id.oid, &msg.oid);
1636 if (fc == &t->prev_fc)
1640 else if (fc == &t->next_fc)
1649 send_prebuilt_message (&msg.header, peer, t);
1650 fc->poll_time = GNUNET_TIME_STD_BACKOFF (fc->poll_time);
1651 fc->poll_task = GNUNET_SCHEDULER_add_delayed (fc->poll_time,
1657 * Build a PeerPath from the paths returned from the DHT, reversing the paths
1658 * to obtain a local peer -> destination path and interning the peer ids.
1660 * @return Newly allocated and created path
1662 static struct MeshPeerPath *
1663 path_build_from_dht (const struct GNUNET_PeerIdentity *get_path,
1664 unsigned int get_path_length,
1665 const struct GNUNET_PeerIdentity *put_path,
1666 unsigned int put_path_length)
1668 struct MeshPeerPath *p;
1674 GNUNET_PEER_change_rc (myid, 1);
1675 i = get_path_length;
1676 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " GET has %d hops.\n", i);
1677 for (i--; i >= 0; i--)
1679 id = GNUNET_PEER_intern (&get_path[i]);
1680 if (p->length > 0 && id == p->peers[p->length - 1])
1682 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Optimizing 1 hop out.\n");
1683 GNUNET_PEER_change_rc (id, -1);
1687 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Adding from GET: %s.\n",
1688 GNUNET_i2s (&get_path[i]));
1690 p->peers = GNUNET_realloc (p->peers, sizeof (GNUNET_PEER_Id) * p->length);
1691 p->peers[p->length - 1] = id;
1694 i = put_path_length;
1695 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " PUT has %d hops.\n", i);
1696 for (i--; i >= 0; i--)
1698 id = GNUNET_PEER_intern (&put_path[i]);
1701 /* PUT path went through us, so discard the path up until now and start
1702 * from here to get a much shorter (and loop-free) path.
1707 if (p->length > 0 && id == p->peers[p->length - 1])
1709 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Optimizing 1 hop out.\n");
1710 GNUNET_PEER_change_rc (id, -1);
1714 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Adding from PUT: %s.\n",
1715 GNUNET_i2s (&put_path[i]));
1717 p->peers = GNUNET_realloc (p->peers, sizeof (GNUNET_PEER_Id) * p->length);
1718 p->peers[p->length - 1] = id;
1722 if (get_path_length > 0)
1723 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " (first of GET: %s)\n",
1724 GNUNET_i2s (&get_path[0]));
1725 if (put_path_length > 0)
1726 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " (first of PUT: %s)\n",
1727 GNUNET_i2s (&put_path[0]));
1728 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " In total: %d hops\n",
1730 for (i = 0; i < p->length; i++)
1732 struct GNUNET_PeerIdentity peer_id;
1734 GNUNET_PEER_resolve (p->peers[i], &peer_id);
1735 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " %u: %s\n", p->peers[i],
1736 GNUNET_i2s (&peer_id));
1744 * Adds a path to the peer_infos of all the peers in the path
1746 * @param p Path to process.
1747 * @param confirmed Whether we know if the path works or not.
1750 path_add_to_peers (struct MeshPeerPath *p, int confirmed)
1754 /* TODO: invert and add */
1755 for (i = 0; i < p->length && p->peers[i] != myid; i++) /* skip'em */ ;
1756 for (i++; i < p->length; i++)
1758 struct MeshPeerInfo *aux;
1759 struct MeshPeerPath *copy;
1761 aux = peer_get_short (p->peers[i]);
1762 copy = path_duplicate (p);
1763 copy->length = i + 1;
1764 peer_info_add_path (aux, copy, p->length < 3 ? GNUNET_NO : confirmed);
1770 * Send keepalive packets for a peer
1772 * @param cls Closure (tunnel for which to send the keepalive).
1773 * @param tc Notification context.
1776 path_refresh (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
1780 * Search for a tunnel among the incoming tunnels
1782 * @param tid the local id of the tunnel
1784 * @return tunnel handler, NULL if doesn't exist
1786 static struct MeshTunnel *
1787 tunnel_get_incoming (MESH_TunnelNumber tid)
1789 struct GNUNET_HashCode hash;
1791 GNUNET_assert (tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV);
1792 GMC_hash32 (tid, &hash);
1793 return GNUNET_CONTAINER_multihashmap_get (incoming_tunnels, &hash);
1798 * Search for a tunnel among the tunnels for a client
1800 * @param c the client whose tunnels to search in
1801 * @param tid the local id of the tunnel
1803 * @return tunnel handler, NULL if doesn't exist
1805 static struct MeshTunnel *
1806 tunnel_get_by_local_id (struct MeshClient *c, MESH_TunnelNumber tid)
1808 if (tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
1810 return tunnel_get_incoming (tid);
1814 struct GNUNET_HashCode hash;
1816 GMC_hash32 (tid, &hash);
1817 return GNUNET_CONTAINER_multihashmap_get (c->own_tunnels, &hash);
1823 * Search for a tunnel by global ID using PEER_ID
1825 * @param pi owner of the tunnel
1826 * @param tid global tunnel number
1828 * @return tunnel handler, NULL if doesn't exist
1830 static struct MeshTunnel *
1831 tunnel_get_by_pi (GNUNET_PEER_Id pi, MESH_TunnelNumber tid)
1833 struct MESH_TunnelID id;
1834 struct GNUNET_HashCode hash;
1839 GNUNET_CRYPTO_hash (&id, sizeof (struct MESH_TunnelID), &hash);
1840 return GNUNET_CONTAINER_multihashmap_get (tunnels, &hash);
1845 * Search for a tunnel by global ID using full PeerIdentities
1847 * @param oid owner of the tunnel
1848 * @param tid global tunnel number
1850 * @return tunnel handler, NULL if doesn't exist
1852 static struct MeshTunnel *
1853 tunnel_get (const struct GNUNET_PeerIdentity *oid, MESH_TunnelNumber tid)
1855 return tunnel_get_by_pi (GNUNET_PEER_search (oid), tid);
1860 * Add a client to a tunnel, initializing all needed data structures.
1862 * @param t Tunnel to which add the client.
1863 * @param c Client which to add to the tunnel.
1866 tunnel_add_client (struct MeshTunnel *t, struct MeshClient *c)
1868 struct GNUNET_HashCode hash;
1870 if (NULL != t->client)
1875 GMC_hash32 (t->local_tid_dest, &hash);
1877 GNUNET_CONTAINER_multihashmap_put (c->incoming_tunnels, &hash, t,
1878 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST))
1884 GNUNET_CONTAINER_multihashmap_put (incoming_tunnels, &hash, t,
1885 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST))
1895 tunnel_use_path (struct MeshTunnel *t, struct MeshPeerPath *p)
1897 unsigned int own_pos;
1899 for (own_pos = 0; own_pos < p->length; own_pos++)
1901 if (p->peers[own_pos] == myid)
1904 if (own_pos > p->length - 1)
1910 if (own_pos < p->length - 1)
1911 t->next_hop = p->peers[own_pos + 1];
1913 t->next_hop = p->peers[own_pos];
1914 GNUNET_PEER_change_rc (t->next_hop, 1);
1916 t->prev_hop = p->peers[own_pos - 1];
1918 t->prev_hop = p->peers[0];
1919 GNUNET_PEER_change_rc (t->prev_hop, 1);
1921 if (NULL != t->path)
1922 path_destroy (t->path);
1923 t->path = path_duplicate (p);
1926 if (GNUNET_SCHEDULER_NO_TASK != t->maintenance_task)
1927 GNUNET_SCHEDULER_cancel (t->maintenance_task);
1928 t->maintenance_task = GNUNET_SCHEDULER_add_delayed (refresh_path_time,
1935 * Notifies a tunnel that a connection has broken that affects at least
1936 * some of its peers. Sends a notification towards the root of the tree.
1937 * In case the peer is the owner of the tree, notifies the client that owns
1938 * the tunnel and tries to reconnect.
1940 * @param t Tunnel affected.
1941 * @param p1 Peer that got disconnected from p2.
1942 * @param p2 Peer that got disconnected from p1.
1944 * @return Short ID of the peer disconnected (either p1 or p2).
1945 * 0 if the tunnel remained unaffected.
1947 static GNUNET_PEER_Id
1948 tunnel_notify_connection_broken (struct MeshTunnel *t, GNUNET_PEER_Id p1,
1951 // if (myid != p1 && myid != p2) FIXME
1956 // if (tree_get_predecessor (t->tree) != 0)
1958 // /* We are the peer still connected, notify owner of the disconnection. */
1959 // struct GNUNET_MESH_PathBroken msg;
1960 // struct GNUNET_PeerIdentity neighbor;
1962 // msg.header.size = htons (sizeof (msg));
1963 // msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_BROKEN);
1964 // GNUNET_PEER_resolve (t->id.oid, &msg.oid);
1965 // msg.tid = htonl (t->id.tid);
1966 // msg.peer1 = my_full_id;
1967 // GNUNET_PEER_resolve (pid, &msg.peer2);
1968 // GNUNET_PEER_resolve (tree_get_predecessor (t->tree), &neighbor);
1969 // send_prebuilt_message (&msg.header, &neighbor, t);
1976 * Build a local ACK message and send it to a local client.
1978 * @param t Tunnel on which to send the ACK.
1979 * @param c Client to whom send the ACK.
1980 * @param ack Value of the ACK.
1981 * @param is_fwd Set to GNUNET_YES for FWD ACK (dest->owner)
1984 send_local_ack (struct MeshTunnel *t,
1985 struct MeshClient *c,
1989 struct GNUNET_MESH_LocalAck msg;
1991 msg.header.size = htons (sizeof (msg));
1992 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK);
1993 msg.tunnel_id = htonl (is_fwd ? t->local_tid : t->local_tid_dest);
1994 msg.ack = htonl (ack);
1995 GNUNET_SERVER_notification_context_unicast(nc,
2002 * Build an ACK message and queue it to send to the given peer.
2004 * @param t Tunnel on which to send the ACK.
2005 * @param peer Peer to whom send the ACK.
2006 * @param ack Value of the ACK.
2009 send_ack (struct MeshTunnel *t, GNUNET_PEER_Id peer, uint32_t ack)
2011 struct GNUNET_MESH_ACK msg;
2013 GNUNET_PEER_resolve (t->id.oid, &msg.oid);
2014 msg.header.size = htons (sizeof (msg));
2015 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_ACK);
2016 msg.pid = htonl (ack);
2017 msg.tid = htonl (t->id.tid);
2019 send_prebuilt_message (&msg.header, peer, t);
2024 * Send an ACK informing the predecessor about the available buffer space.
2025 * In case there is no predecessor, inform the owning client.
2026 * If buffering is off, send only on behalf of children or self if endpoint.
2027 * If buffering is on, send when sent to children and buffer space is free.
2028 * Note that although the name is fwd_ack, the FWD mean forward *traffic*,
2029 * the ACK itself goes "back" (towards root).
2031 * @param t Tunnel on which to send the ACK.
2032 * @param type Type of message that triggered the ACK transmission.
2035 tunnel_send_fwd_ack (struct MeshTunnel *t, uint16_t type)
2039 /* Is it after unicast retransmission? */
2042 case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
2043 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2044 "ACK due to FWD DATA retransmission\n");
2045 if (GNUNET_YES == t->nobuffer)
2047 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Not sending ACK, nobuffer\n");
2051 case GNUNET_MESSAGE_TYPE_MESH_ACK:
2052 if (NULL != t->owner && GNUNET_YES == t->reliable)
2054 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK:
2056 case GNUNET_MESSAGE_TYPE_MESH_PATH_ACK:
2057 case GNUNET_MESSAGE_TYPE_MESH_POLL:
2058 case GNUNET_MESSAGE_TYPE_MESH_DATA_ACK:
2059 t->force_ack = GNUNET_YES;
2065 /* Check if we need to transmit the ACK */
2066 if (t->queue_max > t->next_fc.queue_n * 4 &&
2067 GMC_is_pid_bigger(t->prev_fc.last_ack_sent, t->prev_fc.last_pid_recv) &&
2068 GNUNET_NO == t->force_ack)
2070 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Not sending ACK, buffer free\n");
2071 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2072 " t->qmax: %u, t->qn: %u\n",
2073 t->queue_max, t->next_fc.queue_n);
2074 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2075 " t->pid: %u, t->ack: %u\n",
2076 t->prev_fc.last_pid_recv, t->prev_fc.last_ack_sent);
2080 /* Ok, ACK might be necessary, what PID to ACK? */
2081 ack = t->prev_fc.last_pid_recv + t->queue_max - t->next_fc.queue_n;
2082 if (ack == t->prev_fc.last_ack_sent && GNUNET_NO == t->force_ack)
2084 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Not sending FWD ACK, not needed\n");
2088 t->prev_fc.last_ack_sent = ack;
2089 if (NULL != t->owner)
2090 send_local_ack (t, t->owner, ack, GNUNET_YES);
2091 else if (0 != t->prev_hop)
2092 send_ack (t, t->prev_hop, ack);
2096 t->force_ack = GNUNET_NO;
2101 * Send an ACK informing the children node/client about the available
2103 * If buffering is off, send only on behalf of root (can be self).
2104 * If buffering is on, send when sent to predecessor and buffer space is free.
2105 * Note that although the name is bck_ack, the BCK mean backwards *traffic*,
2106 * the ACK itself goes "forward" (towards children/clients).
2108 * @param t Tunnel on which to send the ACK.
2109 * @param type Type of message that triggered the ACK transmission.
2112 tunnel_send_bck_ack (struct MeshTunnel *t, uint16_t type)
2115 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2116 "Sending BCK ACK on tunnel %u [%u] due to %s\n",
2117 t->id.oid, t->id.tid, GNUNET_MESH_DEBUG_M2S(type));
2118 /* Is it after data to_origin retransmission? */
2121 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
2122 if (GNUNET_YES == t->nobuffer)
2124 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2125 " Not sending ACK, nobuffer + traffic\n");
2129 case GNUNET_MESSAGE_TYPE_MESH_ACK:
2130 if (NULL != t->client && GNUNET_YES == t->reliable)
2132 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK:
2134 case GNUNET_MESSAGE_TYPE_MESH_PATH_ACK:
2135 case GNUNET_MESSAGE_TYPE_MESH_POLL:
2136 case GNUNET_MESSAGE_TYPE_MESH_DATA_ACK:
2137 t->force_ack = GNUNET_YES;
2143 /* TODO: Check if we need to transmit the ACK (as in fwd) */
2145 ack = t->next_fc.last_pid_recv + t->queue_max - t->prev_fc.queue_n;
2147 if (t->next_fc.last_ack_sent == ack && GNUNET_NO == t->force_ack)
2149 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2150 " Not sending ACK, not needed, last ack sent was %u\n",
2151 t->next_fc.last_ack_sent);
2154 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2155 " Sending BCK ACK %u (last sent: %u)\n",
2156 ack, t->next_fc.last_ack_sent);
2157 t->next_fc.last_ack_sent = ack;
2159 if (NULL != t->client)
2160 send_local_ack (t, t->client, ack, GNUNET_NO);
2161 else if (0 != t->next_hop)
2162 send_ack (t, t->next_hop, ack);
2165 t->force_ack = GNUNET_NO;
2170 * Modify the unicast message TID from global to local and send to client.
2172 * @param t Tunnel on which to send the message.
2173 * @param msg Message to modify and send.
2176 tunnel_send_client_ucast (struct MeshTunnel *t,
2177 const struct GNUNET_MESH_Data *msg)
2179 struct GNUNET_MESH_Data *copy;
2180 uint16_t size = ntohs (msg->header.size);
2183 if (size < sizeof (struct GNUNET_MESH_Data) +
2184 sizeof (struct GNUNET_MessageHeader))
2186 GNUNET_break_op (0);
2189 if (NULL == t->client)
2194 copy = (struct GNUNET_MESH_Data *) cbuf;
2195 memcpy (copy, msg, size);
2196 copy->tid = htonl (t->local_tid_dest);
2197 GNUNET_SERVER_notification_context_unicast (nc, t->client->handle,
2198 ©->header, GNUNET_NO);
2203 * Modify the to_origin message TID from global to local and send to client.
2205 * @param t Tunnel on which to send the message.
2206 * @param msg Message to modify and send.
2209 tunnel_send_client_to_orig (struct MeshTunnel *t,
2210 const struct GNUNET_MESH_Data *msg)
2212 struct GNUNET_MESH_Data *copy;
2213 uint16_t size = ntohs (msg->header.size);
2216 if (size < sizeof (struct GNUNET_MESH_Data) +
2217 sizeof (struct GNUNET_MessageHeader))
2219 GNUNET_break_op (0);
2222 if (NULL == t->owner)
2227 copy = (struct GNUNET_MESH_Data *) cbuf;
2228 memcpy (cbuf, msg, size);
2229 copy->tid = htonl (t->local_tid);
2230 GNUNET_SERVER_notification_context_unicast (nc, t->owner->handle,
2231 ©->header, GNUNET_NO);
2236 * We haven't received an ACK after a certain time: restransmit the message.
2238 * @param cls Closure (MeshSentMessage with the message to restransmit)
2239 * @param tc TaskContext.
2242 tunnel_retransmit_message (void *cls,
2243 const struct GNUNET_SCHEDULER_TaskContext *tc)
2245 struct MeshSentMessage *copy = cls;
2246 struct GNUNET_MESH_Data *payload;
2249 copy->retry_task = GNUNET_SCHEDULER_NO_TASK;
2250 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
2253 payload = (struct GNUNET_MESH_Data *) ©[1];
2254 hop = copy->is_forward ? copy->t->next_hop : copy->t->prev_hop;
2255 send_prebuilt_message (&payload->header, hop, copy->t);
2256 GNUNET_STATISTICS_update (stats, "# unicast retransmitted", 1, GNUNET_NO);
2257 copy->retry_timer = GNUNET_TIME_STD_BACKOFF (copy->retry_timer);
2258 copy->retry_task = GNUNET_SCHEDULER_add_delayed (copy->retry_timer,
2259 &tunnel_retransmit_message,
2265 * @brief Re-initiate traffic to this peer if necessary.
2267 * Check if there is traffic queued towards this peer
2268 * and the core transmit handle is NULL (traffic was stalled).
2269 * If so, call core tmt rdy.
2271 * @param peer_id Short ID of peer to which initiate traffic.
2274 peer_unlock_queue(GNUNET_PEER_Id peer_id)
2276 struct MeshPeerInfo *peer;
2277 struct GNUNET_PeerIdentity id;
2278 struct MeshPeerQueue *q;
2281 peer = peer_get_short (peer_id);
2282 if (NULL != peer->core_transmit)
2285 q = queue_get_next (peer);
2288 /* Might br multicast traffic already sent to this particular peer but
2289 * not to other children in this tunnel.
2290 * This way t->queue_n would be > 0 but the queue of this particular peer
2296 GNUNET_PEER_resolve (peer->id, &id);
2297 peer->core_transmit =
2298 GNUNET_CORE_notify_transmit_ready(core_handle,
2301 GNUNET_TIME_UNIT_FOREVER_REL,
2311 * Send a message to all peers and clients in this tunnel that the tunnel
2312 * is no longer valid. If some peer or client should not receive the message,
2313 * should be zero'ed out before calling this function.
2315 * @param t The tunnel whose peers and clients to notify.
2318 tunnel_send_destroy (struct MeshTunnel *t)
2320 struct GNUNET_MESH_TunnelDestroy msg;
2321 struct GNUNET_PeerIdentity id;
2323 msg.header.size = htons (sizeof (msg));
2324 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY);
2325 GNUNET_PEER_resolve (t->id.oid, &msg.oid);
2326 msg.tid = htonl (t->id.tid);
2327 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2328 " sending tunnel destroy for tunnel: %s [%X]\n",
2329 GNUNET_i2s (&msg.oid), t->id.tid);
2331 if (NULL == t->client && 0 != t->next_hop)
2333 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " child: %u\n", t->next_hop);
2334 GNUNET_PEER_resolve (t->next_hop, &id);
2335 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2336 " sending forward to %s\n",
2338 send_prebuilt_message (&msg.header, t->next_hop, t);
2340 if (NULL == t->owner && 0 != t->prev_hop)
2342 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " parent: %u\n", t->prev_hop);
2343 GNUNET_PEER_resolve (t->prev_hop, &id);
2344 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2345 " sending back to %s\n",
2347 send_prebuilt_message (&msg.header, t->prev_hop, t);
2349 if (NULL != t->owner)
2351 send_client_tunnel_destroy (t->owner, t);
2353 if (NULL != t->client)
2355 send_client_tunnel_destroy (t->client, t);
2361 * Cancel all transmissions towards a neighbor that belongs to a certain tunnel.
2363 * @param t Tunnel which to cancel.
2364 * @param neighbor Short ID of the neighbor to whom cancel the transmissions.
2367 peer_cancel_queues (GNUNET_PEER_Id neighbor, struct MeshTunnel *t)
2369 struct MeshPeerInfo *peer_info;
2370 struct MeshPeerQueue *pq;
2371 struct MeshPeerQueue *next;
2374 return; /* Was local peer, 0'ed in tunnel_destroy_iterator */
2375 peer_info = peer_get_short (neighbor);
2376 for (pq = peer_info->queue_head; NULL != pq; pq = next)
2379 if (pq->tunnel == t)
2381 if (GNUNET_MESSAGE_TYPE_MESH_UNICAST == pq->type ||
2382 GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN == pq->type)
2384 /* Should have been removed on destroy children */
2387 queue_destroy (pq, GNUNET_YES);
2390 if (NULL == peer_info->queue_head && NULL != peer_info->core_transmit)
2392 GNUNET_CORE_notify_transmit_ready_cancel(peer_info->core_transmit);
2393 peer_info->core_transmit = NULL;
2399 * Destroy the tunnel.
2401 * This function does not generate any warning traffic to clients or peers.
2404 * Remove the tunnel from peer_info's and clients' hashmaps.
2405 * Cancel messages belonging to this tunnel queued to neighbors.
2406 * Free any allocated resources linked to the tunnel.
2408 * @param t the tunnel to destroy
2410 * @return GNUNET_OK on success
2413 tunnel_destroy (struct MeshTunnel *t)
2415 struct MeshClient *c;
2416 struct GNUNET_HashCode hash;
2426 struct GNUNET_PeerIdentity id;
2428 GNUNET_PEER_resolve (t->id.oid, &id);
2429 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "destroying tunnel %s [%x]\n",
2430 GNUNET_i2s (&id), t->id.tid);
2432 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
2436 GNUNET_CRYPTO_hash (&t->id, sizeof (struct MESH_TunnelID), &hash);
2437 if (GNUNET_YES != GNUNET_CONTAINER_multihashmap_remove (tunnels, &hash, t))
2445 GMC_hash32 (t->local_tid, &hash);
2447 GNUNET_CONTAINER_multihashmap_remove (c->own_tunnels, &hash, t))
2454 if (NULL != t->client)
2457 GMC_hash32 (t->local_tid_dest, &hash);
2459 GNUNET_CONTAINER_multihashmap_remove (c->incoming_tunnels, &hash, t))
2465 GNUNET_CONTAINER_multihashmap_remove (incoming_tunnels, &hash, t))
2472 if (0 != t->prev_hop)
2474 peer_cancel_queues (t->prev_hop, t);
2475 GNUNET_PEER_change_rc (t->prev_hop, -1);
2477 if (0 != t->next_hop)
2479 peer_cancel_queues (t->next_hop, t);
2480 GNUNET_PEER_change_rc (t->next_hop, -1);
2483 peer_info_remove_tunnel (peer_get_short (t->dest), t);
2486 if (GNUNET_SCHEDULER_NO_TASK != t->maintenance_task)
2487 GNUNET_SCHEDULER_cancel (t->maintenance_task);
2490 GNUNET_STATISTICS_update (stats, "# tunnels", -1, GNUNET_NO);
2491 path_destroy (t->path);
2497 * Tunnel is empty: destroy it.
2499 * Notifies all participants (peers, cleints) about the destruction.
2501 * @param t Tunnel to destroy.
2504 tunnel_destroy_empty (struct MeshTunnel *t)
2508 struct GNUNET_PeerIdentity id;
2510 GNUNET_PEER_resolve (t->id.oid, &id);
2511 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2512 "executing destruction of empty tunnel %s [%X]\n",
2513 GNUNET_i2s (&id), t->id.tid);
2517 if (GNUNET_NO == t->destroy)
2518 tunnel_send_destroy (t);
2519 if (0 == t->pending_messages)
2522 t->destroy = GNUNET_YES;
2526 * Initialize a Flow Control structure to the initial state.
2528 * @param fc Flow Control structure to initialize.
2531 fc_init (struct MeshFlowControl *fc)
2533 fc->last_pid_sent = (uint32_t) -1; /* Next (expected) = 0 */
2534 fc->last_pid_recv = (uint32_t) -1;
2535 fc->last_ack_sent = (uint32_t) -1; /* No traffic allowed yet */
2536 fc->last_ack_recv = (uint32_t) -1;
2537 fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
2538 fc->poll_time = GNUNET_TIME_UNIT_SECONDS;
2543 * Create a new tunnel
2545 * @param owner Who is the owner of the tunnel (short ID).
2546 * @param tid Tunnel Number of the tunnel.
2547 * @param client Clients that owns the tunnel, NULL for foreign tunnels.
2548 * @param local Tunnel Number for the tunnel, for the client point of view.
2550 * @return A new initialized tunnel. NULL on error.
2552 static struct MeshTunnel *
2553 tunnel_new (GNUNET_PEER_Id owner,
2554 MESH_TunnelNumber tid,
2555 struct MeshClient *client,
2556 MESH_TunnelNumber local)
2558 struct MeshTunnel *t;
2559 struct GNUNET_HashCode hash;
2561 if (n_tunnels >= max_tunnels && NULL == client)
2564 t = GNUNET_malloc (sizeof (struct MeshTunnel));
2567 t->queue_max = (max_msgs_queue / max_tunnels) + 1;
2569 fc_init (&t->next_fc);
2570 fc_init (&t->prev_fc);
2571 t->local_tid = local;
2573 GNUNET_STATISTICS_update (stats, "# tunnels", 1, GNUNET_NO);
2575 GNUNET_CRYPTO_hash (&t->id, sizeof (struct MESH_TunnelID), &hash);
2577 GNUNET_CONTAINER_multihashmap_put (tunnels, &hash, t,
2578 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
2585 GNUNET_SERVER_receive_done (client->handle, GNUNET_SYSERR);
2592 GMC_hash32 (t->local_tid, &hash);
2594 GNUNET_CONTAINER_multihashmap_put (client->own_tunnels, &hash, t,
2595 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
2599 GNUNET_SERVER_receive_done (client->handle, GNUNET_SYSERR);
2609 * Set options in a tunnel, extracted from a bit flag field
2611 * @param t Tunnel to set options to.
2612 * @param options Bit array in host byte order.
2615 tunnel_set_options (struct MeshTunnel *t, uint32_t options)
2617 t->nobuffer = options & GNUNET_MESH_OPTION_NOBUFFER;
2618 t->reliable = options & GNUNET_MESH_OPTION_RELIABLE;
2623 * Iterator for deleting each tunnel whose client endpoint disconnected.
2625 * @param cls Closure (client that has disconnected).
2626 * @param key The hash of the local tunnel id (used to access the hashmap).
2627 * @param value The value stored at the key (tunnel to destroy).
2629 * @return GNUNET_OK, keep iterating.
2632 tunnel_destroy_iterator (void *cls,
2633 const struct GNUNET_HashCode * key,
2636 struct MeshTunnel *t = value;
2637 struct MeshClient *c = cls;
2639 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2640 " Tunnel %X / %X destroy, due to client %u shutdown.\n",
2641 t->local_tid, t->local_tid_dest, c->id);
2642 client_delete_tunnel (c, t);
2645 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Client %u is destination.\n", c->id);
2647 if (0 != t->next_hop) { /* destroy could come before a path is used */
2648 GNUNET_PEER_change_rc (t->next_hop, -1);
2652 else if (c == t->owner)
2654 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Client %u is owner.\n", c->id);
2656 if (0 != t->prev_hop) { /* destroy could come before a path is used */
2657 GNUNET_PEER_change_rc (t->prev_hop, -1);
2665 tunnel_destroy_empty (t);
2672 * Timeout function, destroys tunnel if called
2674 * @param cls Closure (tunnel to destroy).
2675 * @param tc TaskContext
2678 tunnel_timeout (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
2680 struct MeshTunnel *t = cls;
2681 struct GNUNET_PeerIdentity id;
2683 t->maintenance_task = GNUNET_SCHEDULER_NO_TASK;
2684 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
2686 GNUNET_PEER_resolve(t->id.oid, &id);
2687 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2688 "Tunnel %s [%X] timed out. Destroying.\n",
2689 GNUNET_i2s(&id), t->id.tid);
2690 if (NULL != t->client)
2691 send_client_tunnel_destroy (t->client, t);
2692 tunnel_destroy (t); /* Do not notify other */
2697 * Resets the tunnel timeout. Starts it if no timeout was running.
2699 * @param t Tunnel whose timeout to reset.
2701 * TODO use heap to improve efficiency of scheduler.
2704 tunnel_reset_timeout (struct MeshTunnel *t)
2706 if (NULL != t->owner || 0 != t->local_tid || 0 == t->prev_hop)
2708 if (GNUNET_SCHEDULER_NO_TASK != t->maintenance_task)
2709 GNUNET_SCHEDULER_cancel (t->maintenance_task);
2710 t->maintenance_task =
2711 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_multiply
2712 (refresh_path_time, 4), &tunnel_timeout, t);
2716 /******************************************************************************/
2717 /**************** MESH NETWORK HANDLER HELPERS ***********************/
2718 /******************************************************************************/
2721 * Function to send a create path packet to a peer.
2723 * @param cls closure
2724 * @param size number of bytes available in buf
2725 * @param buf where the callee should write the message
2726 * @return number of bytes written to buf
2729 send_core_path_create (void *cls, size_t size, void *buf)
2731 struct MeshTunnel *t = cls;
2732 struct GNUNET_MESH_CreateTunnel *msg;
2733 struct GNUNET_PeerIdentity *peer_ptr;
2734 struct MeshPeerPath *p = t->path;
2739 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "CREATE PATH sending...\n");
2741 sizeof (struct GNUNET_MESH_CreateTunnel) +
2742 p->length * sizeof (struct GNUNET_PeerIdentity);
2744 if (size < size_needed || NULL == buf)
2749 msg = (struct GNUNET_MESH_CreateTunnel *) buf;
2750 msg->header.size = htons (size_needed);
2751 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE);
2752 msg->tid = ntohl (t->id.tid);
2755 if (GNUNET_YES == t->nobuffer)
2756 opt |= GNUNET_MESH_OPTION_NOBUFFER;
2757 if (GNUNET_YES == t->reliable)
2758 opt |= GNUNET_MESH_OPTION_RELIABLE;
2759 msg->opt = htonl (opt);
2760 msg->port = htonl (t->port);
2762 peer_ptr = (struct GNUNET_PeerIdentity *) &msg[1];
2763 for (i = 0; i < p->length; i++)
2765 GNUNET_PEER_resolve (p->peers[i], peer_ptr++);
2768 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2769 "CREATE PATH (%u bytes long) sent!\n", size_needed);
2775 * Creates a path ack message in buf and frees all unused resources.
2777 * @param cls closure (MeshTransmissionDescriptor)
2778 * @param size number of bytes available in buf
2779 * @param buf where the callee should write the message
2780 * @return number of bytes written to buf
2783 send_core_path_ack (void *cls, size_t size, void *buf)
2785 struct MeshTunnel *t = cls;
2786 struct GNUNET_MESH_PathACK *msg = buf;
2788 GNUNET_assert (NULL != t);
2789 if (sizeof (struct GNUNET_MESH_PathACK) > size)
2794 t->prev_fc.last_ack_sent = t->nobuffer ? 0 : t->queue_max - 1;
2795 msg->header.size = htons (sizeof (struct GNUNET_MESH_PathACK));
2796 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_ACK);
2797 GNUNET_PEER_resolve (t->id.oid, &msg->oid);
2798 msg->tid = htonl (t->id.tid);
2799 msg->peer_id = my_full_id;
2800 msg->ack = htonl (t->prev_fc.last_ack_sent);
2802 /* TODO add signature */
2804 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "PATH ACK sent!\n");
2805 return sizeof (struct GNUNET_MESH_PathACK);
2810 * Free a transmission that was already queued with all resources
2811 * associated to the request.
2813 * @param queue Queue handler to cancel.
2814 * @param clear_cls Is it necessary to free associated cls?
2817 queue_destroy (struct MeshPeerQueue *queue, int clear_cls)
2819 struct MeshFlowControl *fc;
2821 if (GNUNET_YES == clear_cls)
2823 switch (queue->type)
2825 case GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY:
2826 GNUNET_log (GNUNET_ERROR_TYPE_INFO, " cancelling TUNNEL_DESTROY\n");
2827 GNUNET_break (GNUNET_YES == queue->tunnel->destroy);
2829 case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
2830 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
2831 case GNUNET_MESSAGE_TYPE_MESH_ACK:
2832 case GNUNET_MESSAGE_TYPE_MESH_POLL:
2833 case GNUNET_MESSAGE_TYPE_MESH_PATH_KEEPALIVE:
2834 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2835 " prebuilt message\n");
2836 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2838 GNUNET_MESH_DEBUG_M2S (queue->type));
2840 case GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE:
2841 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " type create path\n");
2845 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2846 " type %s unknown!\n",
2847 GNUNET_MESH_DEBUG_M2S (queue->type));
2849 GNUNET_free_non_null (queue->cls);
2851 GNUNET_CONTAINER_DLL_remove (queue->peer->queue_head,
2852 queue->peer->queue_tail,
2855 /* Delete from appropriate fc in the tunnel */
2856 if (GNUNET_MESSAGE_TYPE_MESH_UNICAST == queue->type ||
2857 GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN == queue->type )
2859 if (queue->peer->id == queue->tunnel->prev_hop)
2860 fc = &queue->tunnel->prev_fc;
2861 else if (queue->peer->id == queue->tunnel->next_hop)
2862 fc = &queue->tunnel->next_fc;
2870 GNUNET_free (queue);
2875 * @brief Get the next transmittable message from the queue.
2877 * This will be the head, except in the case of being a data packet
2878 * not allowed by the destination peer.
2880 * @param peer Destination peer.
2882 * @return The next viable MeshPeerQueue element to send to that peer.
2883 * NULL when there are no transmittable messages.
2885 struct MeshPeerQueue *
2886 queue_get_next (const struct MeshPeerInfo *peer)
2888 struct MeshPeerQueue *q;
2890 struct GNUNET_MESH_Data *dmsg;
2891 struct MeshTunnel* t;
2895 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* selecting message\n");
2896 for (q = peer->queue_head; NULL != q; q = q->next)
2899 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2901 GNUNET_MESH_DEBUG_M2S (q->type));
2902 dmsg = (struct GNUNET_MESH_Data *) q->cls;
2903 pid = ntohl (dmsg->pid);
2906 case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
2907 ack = t->next_fc.last_ack_recv;
2909 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
2910 ack = t->prev_fc.last_ack_recv;
2913 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2917 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2918 "* ACK: %u, PID: %u\n",
2920 if (GNUNET_NO == GMC_is_pid_bigger (pid, ack))
2922 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2928 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2932 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2933 "* nothing found\n");
2939 queue_send (void *cls, size_t size, void *buf)
2941 struct MeshPeerInfo *peer = cls;
2942 struct GNUNET_MessageHeader *msg;
2943 struct MeshPeerQueue *queue;
2944 struct MeshTunnel *t;
2945 struct GNUNET_PeerIdentity dst_id;
2946 struct MeshFlowControl *fc;
2951 peer->core_transmit = NULL;
2953 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* Queue send\n");
2954 queue = queue_get_next (peer);
2956 /* Queue has no internal mesh traffic nor sendable payload */
2959 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* not ready, return\n");
2960 if (NULL == peer->queue_head)
2961 GNUNET_break (0); /* Core tmt_rdy should've been canceled */
2964 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* not empty\n");
2966 GNUNET_PEER_resolve (peer->id, &dst_id);
2967 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2969 GNUNET_i2s (&dst_id));
2970 /* Check if buffer size is enough for the message */
2971 if (queue->size > size)
2973 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2974 "* not enough room, reissue\n");
2975 peer->core_transmit =
2976 GNUNET_CORE_notify_transmit_ready (core_handle,
2979 GNUNET_TIME_UNIT_FOREVER_REL,
2986 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* size ok\n");
2989 GNUNET_assert (0 < t->pending_messages);
2990 t->pending_messages--;
2994 switch (queue->type)
2997 case GNUNET_MESSAGE_TYPE_MESH_ACK:
2998 case GNUNET_MESSAGE_TYPE_MESH_POLL:
2999 case GNUNET_MESSAGE_TYPE_MESH_PATH_BROKEN:
3000 case GNUNET_MESSAGE_TYPE_MESH_PATH_DESTROY:
3001 case GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY:
3002 case GNUNET_MESSAGE_TYPE_MESH_PATH_KEEPALIVE:
3003 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3005 GNUNET_MESH_DEBUG_M2S (queue->type));
3007 case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
3008 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
3009 data_size = send_core_data_raw (queue->cls, size, buf);
3010 msg = (struct GNUNET_MessageHeader *) buf;
3011 type = ntohs (msg->type);
3013 case GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE:
3014 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* path create\n");
3015 data_size = send_core_path_create (queue->cls, size, buf);
3017 case GNUNET_MESSAGE_TYPE_MESH_PATH_ACK:
3018 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* path ack\n");
3019 data_size = send_core_path_ack (queue->cls, size, buf);
3023 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3024 "* type unknown: %u\n",
3029 if (0 < drop_percent &&
3030 GNUNET_CRYPTO_random_u32(GNUNET_CRYPTO_QUALITY_WEAK, 101) < drop_percent)
3032 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3033 "Dropping message of type %s\n",
3034 GNUNET_MESH_DEBUG_M2S(queue->type));
3037 /* Free queue, but cls was freed by send_core_* */
3038 queue_destroy (queue, GNUNET_NO);
3040 /* Send ACK if needed, after accounting for sent ID in fc->queue_n */
3041 pid = ((struct GNUNET_MESH_Data *) buf)->pid;
3044 case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
3045 t->next_fc.last_pid_sent = pid;
3046 tunnel_send_fwd_ack (t, GNUNET_MESSAGE_TYPE_MESH_UNICAST);
3048 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
3049 t->prev_fc.last_pid_sent = pid;
3050 tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN);
3056 if (GNUNET_YES == t->destroy && 0 == t->pending_messages)
3058 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* destroying tunnel!\n");
3062 /* If more data in queue, send next */
3063 queue = queue_get_next (peer);
3066 struct GNUNET_PeerIdentity id;
3068 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* more data!\n");
3069 GNUNET_PEER_resolve (peer->id, &id);
3070 peer->core_transmit =
3071 GNUNET_CORE_notify_transmit_ready(core_handle,
3074 GNUNET_TIME_UNIT_FOREVER_REL,
3080 else if (NULL != peer->queue_head)
3082 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3084 GNUNET_i2s (&my_full_id));
3085 if (peer->id == t->next_hop)
3087 else if (peer->id == t->prev_hop)
3094 if (NULL != fc && GNUNET_SCHEDULER_NO_TASK == fc->poll_task)
3097 fc->poll_task = GNUNET_SCHEDULER_add_delayed (fc->poll_time,
3101 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* Return %d\n", data_size);
3107 * @brief Queue and pass message to core when possible.
3109 * If type is payload (UNICAST, TO_ORIGIN) checks for queue status and
3110 * accounts for it. In case the queue is full, the message is dropped and
3113 * Otherwise, message is treated as internal and allowed to go regardless of
3116 * @param cls Closure (@c type dependant). It will be used by queue_send to
3117 * build the message to be sent if not already prebuilt.
3118 * @param type Type of the message, 0 for a raw message.
3119 * @param size Size of the message.
3120 * @param dst Neighbor to send message to.
3121 * @param t Tunnel this message belongs to.
3124 queue_add (void *cls, uint16_t type, size_t size,
3125 struct MeshPeerInfo *dst, struct MeshTunnel *t)
3127 struct MeshPeerQueue *queue;
3128 struct GNUNET_PeerIdentity id;
3132 if (GNUNET_MESSAGE_TYPE_MESH_UNICAST == type)
3134 n = &t->next_fc.queue_n;
3136 else if (GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN == type)
3138 n = &t->prev_fc.queue_n;
3142 if (*n >= t->queue_max)
3145 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3146 "queue full: %u/%u\n",
3148 GNUNET_STATISTICS_update(stats,
3149 "# messages dropped (buffer full)",
3151 return; /* Drop message */
3155 queue = GNUNET_malloc (sizeof (struct MeshPeerQueue));
3161 GNUNET_CONTAINER_DLL_insert_tail (dst->queue_head, dst->queue_tail, queue);
3162 if (NULL == dst->core_transmit)
3164 GNUNET_PEER_resolve (dst->id, &id);
3165 dst->core_transmit =
3166 GNUNET_CORE_notify_transmit_ready (core_handle,
3169 GNUNET_TIME_UNIT_FOREVER_REL,
3175 t->pending_messages++;
3179 /******************************************************************************/
3180 /******************** MESH NETWORK HANDLERS **************************/
3181 /******************************************************************************/
3185 * Core handler for path creation
3187 * @param cls closure
3188 * @param message message
3189 * @param peer peer identity this notification is about
3191 * @return GNUNET_OK to keep the connection open,
3192 * GNUNET_SYSERR to close it (signal serious error)
3195 handle_mesh_path_create (void *cls, const struct GNUNET_PeerIdentity *peer,
3196 const struct GNUNET_MessageHeader *message)
3198 unsigned int own_pos;
3201 MESH_TunnelNumber tid;
3202 struct GNUNET_MESH_CreateTunnel *msg;
3203 struct GNUNET_PeerIdentity *pi;
3204 struct MeshPeerPath *path;
3205 struct MeshPeerInfo *dest_peer_info;
3206 struct MeshPeerInfo *orig_peer_info;
3207 struct MeshTunnel *t;
3209 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3210 "Received a path create msg [%s]\n",
3211 GNUNET_i2s (&my_full_id));
3212 size = ntohs (message->size);
3213 if (size < sizeof (struct GNUNET_MESH_CreateTunnel))
3215 GNUNET_break_op (0);
3219 size -= sizeof (struct GNUNET_MESH_CreateTunnel);
3220 if (size % sizeof (struct GNUNET_PeerIdentity))
3222 GNUNET_break_op (0);
3225 size /= sizeof (struct GNUNET_PeerIdentity);
3228 GNUNET_break_op (0);
3231 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " path has %u hops.\n", size);
3232 msg = (struct GNUNET_MESH_CreateTunnel *) message;
3234 tid = ntohl (msg->tid);
3235 pi = (struct GNUNET_PeerIdentity *) &msg[1];
3236 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3237 " path is for tunnel %s[%X].\n", GNUNET_i2s (pi), tid);
3238 t = tunnel_get (pi, tid);
3239 if (NULL == t) /* might be a local tunnel */
3243 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Creating tunnel\n");
3244 t = tunnel_new (GNUNET_PEER_intern (pi), tid, NULL, 0);
3250 t->port = ntohl (msg->port);
3251 opt = ntohl (msg->opt);
3252 if (0 != (opt & GNUNET_MESH_OPTION_NOBUFFER))
3254 t->nobuffer = GNUNET_YES;
3257 if (0 != (opt & GNUNET_MESH_OPTION_RELIABLE))
3259 t->reliable = GNUNET_YES;
3261 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " nobuffer:%d\n", t->nobuffer);
3263 tunnel_reset_timeout (t);
3265 t->state = MESH_TUNNEL_WAITING;
3267 GNUNET_CONTAINER_multihashmap_get (peers, &pi[size - 1].hashPubKey);
3268 if (NULL == dest_peer_info)
3270 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3271 " Creating PeerInfo for destination.\n");
3272 dest_peer_info = GNUNET_malloc (sizeof (struct MeshPeerInfo));
3273 dest_peer_info->id = GNUNET_PEER_intern (&pi[size - 1]);
3274 GNUNET_CONTAINER_multihashmap_put (peers, &pi[size - 1].hashPubKey,
3276 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
3278 orig_peer_info = GNUNET_CONTAINER_multihashmap_get (peers, &pi->hashPubKey);
3279 if (NULL == orig_peer_info)
3281 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3282 " Creating PeerInfo for origin.\n");
3283 orig_peer_info = GNUNET_malloc (sizeof (struct MeshPeerInfo));
3284 orig_peer_info->id = GNUNET_PEER_intern (pi);
3285 GNUNET_CONTAINER_multihashmap_put (peers, &pi->hashPubKey, orig_peer_info,
3286 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
3288 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Creating path...\n");
3289 path = path_new (size);
3291 for (i = 0; i < size; i++)
3293 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ... adding %s\n",
3294 GNUNET_i2s (&pi[i]));
3295 path->peers[i] = GNUNET_PEER_intern (&pi[i]);
3296 if (path->peers[i] == myid)
3299 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Own position: %u\n", own_pos);
3300 if (own_pos == 0 && path->peers[own_pos] != myid)
3302 /* create path: self not found in path through self */
3303 GNUNET_break_op (0);
3304 path_destroy (path);
3308 path_add_to_peers (path, GNUNET_NO);
3309 tunnel_use_path (t, path);
3311 peer_info_add_tunnel (dest_peer_info, t);
3313 if (own_pos == size - 1)
3315 struct MeshClient *c;
3316 struct GNUNET_HashCode hc;
3318 /* Find target client */
3319 GMC_hash32 (t->port, &hc);
3320 c = GNUNET_CONTAINER_multihashmap_get (ports, &hc);
3323 /* TODO send reject */
3327 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " It's for us!\n");
3328 peer_info_add_path_to_origin (orig_peer_info, path, GNUNET_YES);
3330 /* Assign local tid */
3331 while (NULL != tunnel_get_incoming (next_local_tid))
3332 next_local_tid = (next_local_tid + 1) | GNUNET_MESH_LOCAL_TUNNEL_ID_SERV;
3333 t->local_tid_dest = next_local_tid++;
3334 next_local_tid = next_local_tid | GNUNET_MESH_LOCAL_TUNNEL_ID_SERV;
3336 if (GNUNET_YES == t->reliable)
3337 t->sent_messages_bck =
3338 GNUNET_CONTAINER_multihashmap32_create (t->queue_max);
3340 tunnel_add_client (t, c);
3341 send_client_tunnel_create (t);
3346 struct MeshPeerPath *path2;
3348 t->next_hop = path->peers[own_pos + 1];
3349 GNUNET_PEER_change_rc(t->next_hop, 1);
3351 /* It's for somebody else! Retransmit. */
3352 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Retransmitting.\n");
3353 path2 = path_duplicate (path);
3354 peer_info_add_path (dest_peer_info, path2, GNUNET_NO);
3355 peer_info_add_path_to_origin (orig_peer_info, path, GNUNET_NO);
3356 send_create_path (t);
3364 * Core handler for path ACKs
3366 * @param cls closure
3367 * @param message message
3368 * @param peer peer identity this notification is about
3370 * @return GNUNET_OK to keep the connection open,
3371 * GNUNET_SYSERR to close it (signal serious error)
3374 handle_mesh_path_ack (void *cls, const struct GNUNET_PeerIdentity *peer,
3375 const struct GNUNET_MessageHeader *message)
3377 struct GNUNET_MESH_PathACK *msg;
3378 struct MeshPeerInfo *peer_info;
3379 struct MeshPeerPath *p;
3380 struct MeshTunnel *t;
3382 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received a path ACK msg [%s]\n",
3383 GNUNET_i2s (&my_full_id));
3384 msg = (struct GNUNET_MESH_PathACK *) message;
3385 t = tunnel_get (&msg->oid, ntohl(msg->tid));
3388 /* TODO notify that we don't know the tunnel */
3389 GNUNET_STATISTICS_update (stats, "# control on unknown tunnel", 1, GNUNET_NO);
3390 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " don't know the tunnel %s [%X]!\n",
3391 GNUNET_i2s (&msg->oid), ntohl(msg->tid));
3394 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " on tunnel %s [%X]\n",
3395 GNUNET_i2s (&msg->oid), ntohl(msg->tid));
3397 peer_info = peer_get (&msg->peer_id);
3398 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by peer %s\n",
3399 GNUNET_i2s (&msg->peer_id));
3400 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " via peer %s\n",
3403 /* Add path to peers? */
3407 path_add_to_peers (p, GNUNET_YES);
3413 t->state = MESH_TUNNEL_READY;
3414 t->next_fc.last_ack_recv = (NULL == t->client) ? ntohl (msg->ack) : 0;
3415 t->prev_fc.last_ack_sent = ntohl (msg->ack);
3417 /* Message for us? */
3418 if (0 == memcmp (&msg->oid, &my_full_id, sizeof (struct GNUNET_PeerIdentity)))
3420 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " It's for us!\n");
3421 if (NULL == t->owner)
3423 GNUNET_break_op (0);
3426 if (NULL != peer_info->dhtget)
3428 GNUNET_DHT_get_stop (peer_info->dhtget);
3429 peer_info->dhtget = NULL;
3431 tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_PATH_ACK);
3432 tunnel_send_fwd_ack (t, GNUNET_MESSAGE_TYPE_MESH_PATH_ACK);
3436 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3437 " not for us, retransmitting...\n");
3438 peer_info = peer_get (&msg->oid);
3439 send_prebuilt_message (message, t->prev_hop, t);
3445 * Core handler for notifications of broken paths
3447 * @param cls closure
3448 * @param message message
3449 * @param peer peer identity this notification is about
3451 * @return GNUNET_OK to keep the connection open,
3452 * GNUNET_SYSERR to close it (signal serious error)
3455 handle_mesh_path_broken (void *cls, const struct GNUNET_PeerIdentity *peer,
3456 const struct GNUNET_MessageHeader *message)
3458 struct GNUNET_MESH_PathBroken *msg;
3459 struct MeshTunnel *t;
3461 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3462 "Received a PATH BROKEN msg from %s\n", GNUNET_i2s (peer));
3463 msg = (struct GNUNET_MESH_PathBroken *) message;
3464 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " regarding %s\n",
3465 GNUNET_i2s (&msg->peer1));
3466 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " regarding %s\n",
3467 GNUNET_i2s (&msg->peer2));
3468 t = tunnel_get (&msg->oid, ntohl (msg->tid));
3471 GNUNET_break_op (0);
3474 tunnel_notify_connection_broken (t, GNUNET_PEER_search (&msg->peer1),
3475 GNUNET_PEER_search (&msg->peer2));
3482 * Core handler for tunnel destruction
3484 * @param cls closure
3485 * @param message message
3486 * @param peer peer identity this notification is about
3488 * @return GNUNET_OK to keep the connection open,
3489 * GNUNET_SYSERR to close it (signal serious error)
3492 handle_mesh_tunnel_destroy (void *cls, const struct GNUNET_PeerIdentity *peer,
3493 const struct GNUNET_MessageHeader *message)
3495 struct GNUNET_MESH_TunnelDestroy *msg;
3496 struct MeshTunnel *t;
3498 msg = (struct GNUNET_MESH_TunnelDestroy *) message;
3499 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3500 "Got a TUNNEL DESTROY packet from %s\n",
3502 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3503 " for tunnel %s [%u]\n",
3504 GNUNET_i2s (&msg->oid), ntohl (msg->tid));
3505 t = tunnel_get (&msg->oid, ntohl (msg->tid));
3508 /* Probably already got the message from another path,
3509 * destroyed the tunnel and retransmitted to children.
3512 GNUNET_STATISTICS_update (stats, "# control on unknown tunnel",
3516 if (t->local_tid_dest >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
3518 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "INCOMING TUNNEL %X %X\n",
3519 t->local_tid, t->local_tid_dest);
3521 if (GNUNET_PEER_search (peer) == t->prev_hop)
3523 // TODO check owner's signature
3524 // TODO add owner's signatue to tunnel for retransmission
3525 peer_cancel_queues (t->prev_hop, t);
3526 GNUNET_PEER_change_rc (t->prev_hop, -1);
3529 else if (GNUNET_PEER_search (peer) == t->next_hop)
3531 // TODO check dest's signature
3532 // TODO add dest's signatue to tunnel for retransmission
3533 peer_cancel_queues (t->next_hop, t);
3534 GNUNET_PEER_change_rc (t->next_hop, -1);
3539 GNUNET_break_op (0);
3540 // TODO check both owner AND destination's signature to see which matches
3541 // TODO restransmit in appropriate direction
3544 tunnel_destroy_empty (t);
3546 // TODO: add timeout to destroy the tunnel anyway
3552 * Core handler for mesh network traffic going from the origin to a peer
3554 * @param cls closure
3555 * @param peer peer identity this notification is about
3556 * @param message message
3557 * @return GNUNET_OK to keep the connection open,
3558 * GNUNET_SYSERR to close it (signal serious error)
3561 handle_mesh_unicast (void *cls, const struct GNUNET_PeerIdentity *peer,
3562 const struct GNUNET_MessageHeader *message)
3564 struct GNUNET_MESH_Data *msg;
3565 struct MeshTunnel *t;
3570 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "got a unicast packet from %s\n",
3573 size = ntohs (message->size);
3575 sizeof (struct GNUNET_MESH_Data) +
3576 sizeof (struct GNUNET_MessageHeader))
3581 msg = (struct GNUNET_MESH_Data *) message;
3582 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " of type %s\n",
3583 GNUNET_MESH_DEBUG_M2S (ntohs (msg[1].header.type)));
3585 t = tunnel_get (&msg->oid, ntohl (msg->tid));
3588 /* TODO notify back: we don't know this tunnel */
3589 GNUNET_STATISTICS_update (stats, "# data on unknown tunnel", 1, GNUNET_NO);
3590 GNUNET_break_op (0);
3593 pid = ntohl (msg->pid);
3594 if (t->prev_fc.last_pid_recv == pid)
3596 GNUNET_STATISTICS_update (stats, "# duplicate PID drops", 1, GNUNET_NO);
3597 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3598 " Already seen pid %u, DROPPING!\n", pid);
3603 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3604 " pid %u not seen yet, forwarding\n", pid);
3607 if (GMC_is_pid_bigger (pid, t->prev_fc.last_ack_sent))
3609 GNUNET_STATISTICS_update (stats, "# unsolicited unicast", 1, GNUNET_NO);
3610 GNUNET_break_op (0);
3611 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3612 "Received PID %u, ACK %u\n",
3613 pid, t->prev_fc.last_ack_sent);
3614 tunnel_send_fwd_ack(t, GNUNET_MESSAGE_TYPE_MESH_POLL);
3617 t->prev_fc.last_pid_recv = pid;
3619 tunnel_reset_timeout (t);
3620 if (t->dest == myid)
3622 /* TODO signature verification */
3623 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3624 " it's for us! sending to clients...\n");
3625 GNUNET_STATISTICS_update (stats, "# unicast received", 1, GNUNET_NO);
3626 tunnel_send_client_ucast (t, msg);
3627 tunnel_send_fwd_ack (t, GNUNET_MESSAGE_TYPE_MESH_UNICAST);
3630 if (0 == t->next_hop)
3635 ttl = ntohl (msg->ttl);
3636 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ttl: %u\n", ttl);
3639 GNUNET_STATISTICS_update (stats, "# TTL drops", 1, GNUNET_NO);
3640 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, " TTL is 0, DROPPING!\n");
3641 tunnel_send_fwd_ack (t, GNUNET_MESSAGE_TYPE_MESH_ACK);
3644 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3645 " not for us, retransmitting...\n");
3647 send_prebuilt_message (message, t->next_hop, t);
3648 GNUNET_STATISTICS_update (stats, "# unicast forwarded", 1, GNUNET_NO);
3654 * Core handler for mesh network traffic toward the owner of a tunnel
3656 * @param cls closure
3657 * @param message message
3658 * @param peer peer identity this notification is about
3660 * @return GNUNET_OK to keep the connection open,
3661 * GNUNET_SYSERR to close it (signal serious error)
3664 handle_mesh_to_orig (void *cls, const struct GNUNET_PeerIdentity *peer,
3665 const struct GNUNET_MessageHeader *message)
3667 struct GNUNET_MESH_Data *msg;
3668 struct MeshTunnel *t;
3673 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "got a ToOrigin packet from %s\n",
3675 size = ntohs (message->size);
3676 if (size < sizeof (struct GNUNET_MESH_Data) + /* Payload must be */
3677 sizeof (struct GNUNET_MessageHeader)) /* at least a header */
3679 GNUNET_break_op (0);
3682 msg = (struct GNUNET_MESH_Data *) message;
3683 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " of type %s\n",
3684 GNUNET_MESH_DEBUG_M2S (ntohs (msg[1].header.type)));
3685 t = tunnel_get (&msg->oid, ntohl (msg->tid));
3686 pid = ntohl (msg->pid);
3690 /* TODO notify that we dont know this tunnel (whom)? */
3691 GNUNET_STATISTICS_update (stats, "# data on unknown tunnel", 1, GNUNET_NO);
3692 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3693 "Received to_origin with PID %u on unknown tunnel %s [%u]\n",
3694 pid, GNUNET_i2s (&msg->oid), ntohl (msg->tid));
3698 if (t->next_fc.last_pid_recv == pid)
3700 /* already seen this packet, drop */
3701 GNUNET_STATISTICS_update (stats, "# duplicate PID drops BCK", 1, GNUNET_NO);
3702 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3703 " Already seen pid %u, DROPPING!\n", pid);
3704 tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_ACK);
3708 if (GMC_is_pid_bigger (pid, t->next_fc.last_ack_sent))
3710 GNUNET_STATISTICS_update (stats, "# unsolicited to_orig", 1, GNUNET_NO);
3711 GNUNET_break_op (0);
3712 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3713 "Received PID %u, ACK %u\n",
3714 pid, t->next_fc.last_ack_sent);
3715 tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_POLL);
3718 t->next_fc.last_pid_recv = pid;
3719 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3720 " pid %u not seen yet, forwarding\n", pid);
3722 if (myid == t->id.oid)
3724 /* TODO signature verification */
3725 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3726 " it's for us! sending to clients...\n");
3727 GNUNET_STATISTICS_update (stats, "# to origin received", 1, GNUNET_NO);
3728 tunnel_send_client_to_orig (t, msg);
3729 tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN);
3732 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3733 " not for us, retransmitting...\n");
3735 if (0 == t->prev_hop) /* No owner AND no prev hop */
3737 if (GNUNET_YES == t->destroy)
3739 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3740 "to orig received on a dying tunnel %s [%X]\n",
3741 GNUNET_i2s (&msg->oid), ntohl(msg->tid));
3744 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3745 "unknown to origin at %s\n",
3746 GNUNET_i2s (&my_full_id));
3747 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3750 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3751 "on tunnel %s [%X]\n",
3752 GNUNET_i2s (&msg->oid), ntohl(msg->tid));
3755 ttl = ntohl (msg->ttl);
3756 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ttl: %u\n", ttl);
3759 GNUNET_STATISTICS_update (stats, "# TTL drops", 1, GNUNET_NO);
3760 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, " TTL is 0, DROPPING!\n");
3761 tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_ACK);
3764 send_prebuilt_message (message, t->prev_hop, t);
3765 GNUNET_STATISTICS_update (stats, "# to origin forwarded", 1, GNUNET_NO);
3772 * Core handler for mesh network traffic end-to-end ACKs.
3774 * @param cls Closure.
3775 * @param message Message.
3776 * @param peer Peer identity this notification is about.
3778 * @return GNUNET_OK to keep the connection open,
3779 * GNUNET_SYSERR to close it (signal serious error)
3782 handle_mesh_data_ack (void *cls, const struct GNUNET_PeerIdentity *peer,
3783 const struct GNUNET_MessageHeader *message)
3785 struct GNUNET_MESH_DataACK *msg;
3786 struct GNUNET_CONTAINER_MultiHashMap32 *hm;
3787 struct MeshSentMessage *copy;
3788 struct MeshTunnel *t;
3792 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got a DATA ACK message from %s!\n",
3794 msg = (struct GNUNET_MESH_DataACK *) message;
3796 t = tunnel_get (&msg->oid, ntohl (msg->tid));
3799 /* TODO notify that we dont know this tunnel (whom)? */
3800 GNUNET_STATISTICS_update (stats, "# ack on unknown tunnel", 1, GNUNET_NO);
3803 ack = ntohl (msg->pid);
3804 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ACK %u\n", ack);
3806 /* Is this a forward or backward ACK? */
3807 id = GNUNET_PEER_search (peer);
3808 if (t->next_hop == id)
3810 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " FWD ACK\n");
3811 if (NULL == t->owner)
3813 send_prebuilt_message (message, t->prev_hop, t);
3816 hm = t->sent_messages_fwd;
3817 tunnel_send_fwd_ack (t, GNUNET_MESSAGE_TYPE_MESH_DATA_ACK);
3819 else if (t->prev_hop == id)
3821 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " BCK ACK\n");
3822 if (NULL == t->client)
3824 send_prebuilt_message (message, t->next_hop, t);
3827 hm = t->sent_messages_bck;
3828 tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_DATA_ACK);
3831 GNUNET_break_op (0);
3833 copy = GNUNET_CONTAINER_multihashmap32_get (hm, ack);
3836 GNUNET_break (0); // FIXME needed?
3839 GNUNET_break (GNUNET_YES ==
3840 GNUNET_CONTAINER_multihashmap32_remove (hm, ack, copy));
3841 if (GNUNET_SCHEDULER_NO_TASK != copy->retry_task)
3843 GNUNET_SCHEDULER_cancel (copy->retry_task);
3852 * Core handler for mesh network traffic point-to-point acks.
3854 * @param cls closure
3855 * @param message message
3856 * @param peer peer identity this notification is about
3858 * @return GNUNET_OK to keep the connection open,
3859 * GNUNET_SYSERR to close it (signal serious error)
3862 handle_mesh_ack (void *cls, const struct GNUNET_PeerIdentity *peer,
3863 const struct GNUNET_MessageHeader *message)
3865 struct GNUNET_MESH_ACK *msg;
3866 struct MeshTunnel *t;
3870 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got an ACK packet from %s!\n",
3872 msg = (struct GNUNET_MESH_ACK *) message;
3874 t = tunnel_get (&msg->oid, ntohl (msg->tid));
3878 /* TODO notify that we dont know this tunnel (whom)? */
3879 GNUNET_STATISTICS_update (stats, "# ack on unknown tunnel", 1, GNUNET_NO);
3882 ack = ntohl (msg->pid);
3883 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ACK %u\n", ack);
3885 /* Is this a forward or backward ACK? */
3886 id = GNUNET_PEER_search (peer);
3887 if (t->next_hop == id)
3890 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " FWD ACK\n");
3891 if (GNUNET_SCHEDULER_NO_TASK != t->next_fc.poll_task &&
3892 GMC_is_pid_bigger (ack, t->next_fc.last_ack_recv))
3894 GNUNET_SCHEDULER_cancel (t->next_fc.poll_task);
3895 t->next_fc.poll_task = GNUNET_SCHEDULER_NO_TASK;
3896 t->next_fc.poll_time = GNUNET_TIME_UNIT_SECONDS;
3898 t->next_fc.last_ack_recv = ack;
3899 peer_unlock_queue (t->next_hop);
3900 tunnel_send_fwd_ack (t, GNUNET_MESSAGE_TYPE_MESH_ACK);
3902 else if (t->prev_hop == id)
3905 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " BCK ACK\n");
3906 if (GNUNET_SCHEDULER_NO_TASK != t->prev_fc.poll_task &&
3907 GMC_is_pid_bigger (ack, t->prev_fc.last_ack_recv))
3909 GNUNET_SCHEDULER_cancel (t->prev_fc.poll_task);
3910 t->prev_fc.poll_task = GNUNET_SCHEDULER_NO_TASK;
3911 t->prev_fc.poll_time = GNUNET_TIME_UNIT_SECONDS;
3913 t->prev_fc.last_ack_recv = ack;
3914 peer_unlock_queue (t->prev_hop);
3915 tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_ACK);
3918 GNUNET_break_op (0);
3924 * Core handler for mesh network traffic point-to-point ack polls.
3926 * @param cls closure
3927 * @param message message
3928 * @param peer peer identity this notification is about
3930 * @return GNUNET_OK to keep the connection open,
3931 * GNUNET_SYSERR to close it (signal serious error)
3934 handle_mesh_poll (void *cls, const struct GNUNET_PeerIdentity *peer,
3935 const struct GNUNET_MessageHeader *message)
3937 struct GNUNET_MESH_Poll *msg;
3938 struct MeshTunnel *t;
3941 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got an POLL packet from %s!\n",
3944 msg = (struct GNUNET_MESH_Poll *) message;
3946 t = tunnel_get (&msg->oid, ntohl (msg->tid));
3950 /* TODO notify that we dont know this tunnel (whom)? */
3951 GNUNET_STATISTICS_update (stats, "# poll on unknown tunnel", 1, GNUNET_NO);
3952 GNUNET_break_op (0);
3956 /* Is this a forward or backward ACK? */
3957 id = GNUNET_PEER_search(peer);
3958 if (t->next_hop == id)
3960 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " from FWD\n");
3961 tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_POLL);
3963 else if (t->prev_hop == id)
3965 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " from BCK\n");
3966 tunnel_send_fwd_ack (t, GNUNET_MESSAGE_TYPE_MESH_POLL);
3976 * Core handler for mesh keepalives.
3978 * @param cls closure
3979 * @param message message
3980 * @param peer peer identity this notification is about
3981 * @return GNUNET_OK to keep the connection open,
3982 * GNUNET_SYSERR to close it (signal serious error)
3984 * TODO: Check who we got this from, to validate route.
3987 handle_mesh_keepalive (void *cls, const struct GNUNET_PeerIdentity *peer,
3988 const struct GNUNET_MessageHeader *message)
3990 struct GNUNET_MESH_TunnelKeepAlive *msg;
3991 struct MeshTunnel *t;
3993 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "got a keepalive packet from %s\n",
3996 msg = (struct GNUNET_MESH_TunnelKeepAlive *) message;
3997 t = tunnel_get (&msg->oid, ntohl (msg->tid));
4001 /* TODO notify that we dont know that tunnel */
4002 GNUNET_STATISTICS_update (stats, "# keepalive on unknown tunnel", 1,
4007 tunnel_reset_timeout (t);
4008 if (NULL != t->client || 0 == t->next_hop || myid == t->next_hop)
4011 GNUNET_STATISTICS_update (stats, "# keepalives forwarded", 1, GNUNET_NO);
4012 send_prebuilt_message (message, t->next_hop, t);
4019 * Functions to handle messages from core
4021 static struct GNUNET_CORE_MessageHandler core_handlers[] = {
4022 {&handle_mesh_path_create, GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE, 0},
4023 {&handle_mesh_path_broken, GNUNET_MESSAGE_TYPE_MESH_PATH_BROKEN,
4024 sizeof (struct GNUNET_MESH_PathBroken)},
4025 {&handle_mesh_tunnel_destroy, GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY,
4026 sizeof (struct GNUNET_MESH_TunnelDestroy)},
4027 {&handle_mesh_unicast, GNUNET_MESSAGE_TYPE_MESH_UNICAST, 0},
4028 {&handle_mesh_to_orig, GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN, 0},
4029 {&handle_mesh_data_ack, GNUNET_MESSAGE_TYPE_MESH_DATA_ACK,
4030 sizeof (struct GNUNET_MESH_DataACK)},
4031 {&handle_mesh_keepalive, GNUNET_MESSAGE_TYPE_MESH_PATH_KEEPALIVE,
4032 sizeof (struct GNUNET_MESH_TunnelKeepAlive)},
4033 {&handle_mesh_ack, GNUNET_MESSAGE_TYPE_MESH_ACK,
4034 sizeof (struct GNUNET_MESH_ACK)},
4035 {&handle_mesh_poll, GNUNET_MESSAGE_TYPE_MESH_POLL,
4036 sizeof (struct GNUNET_MESH_Poll)},
4037 {&handle_mesh_path_ack, GNUNET_MESSAGE_TYPE_MESH_PATH_ACK,
4038 sizeof (struct GNUNET_MESH_PathACK)},
4044 /******************************************************************************/
4045 /**************** MESH LOCAL HANDLER HELPERS ***********************/
4046 /******************************************************************************/
4051 * notify_client_connection_failure: notify a client that the connection to the
4052 * requested remote peer is not possible (for instance, no route found)
4053 * Function called when the socket is ready to queue more data. "buf" will be
4054 * NULL and "size" zero if the socket was closed for writing in the meantime.
4056 * @param cls closure
4057 * @param size number of bytes available in buf
4058 * @param buf where the callee should write the message
4059 * @return number of bytes written to buf
4062 notify_client_connection_failure (void *cls, size_t size, void *buf)
4065 struct MeshPeerInfo *peer_info;
4066 struct GNUNET_MESH_PeerControl *msg;
4067 struct GNUNET_PeerIdentity id;
4069 if (0 == size && NULL == buf)
4071 // TODO retry? cancel?
4075 size_needed = sizeof (struct GNUNET_MESH_PeerControl);
4076 peer_info = (struct MeshPeerInfo *) cls;
4077 msg = (struct GNUNET_MESH_PeerControl *) buf;
4078 msg->header.size = htons (sizeof (struct GNUNET_MESH_PeerControl));
4079 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_DISCONNECTED);
4080 // msg->tunnel_id = htonl(peer_info->t->tid);
4081 GNUNET_PEER_resolve (peer_info->id, &id);
4082 memcpy (&msg->peer, &id, sizeof (struct GNUNET_PeerIdentity));
4090 * Send keepalive packets for a tunnel.
4092 * @param cls Closure (tunnel for which to send the keepalive).
4093 * @param tc Notification context.
4095 * FIXME: add a refresh reset in case of normal unicast traffic is doing the job
4098 path_refresh (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
4100 struct MeshTunnel *t = cls;
4101 struct GNUNET_MESH_TunnelKeepAlive *msg;
4102 size_t size = sizeof (struct GNUNET_MESH_TunnelKeepAlive);
4105 t->maintenance_task = GNUNET_SCHEDULER_NO_TASK;
4106 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) ||
4107 NULL == t->owner || 0 == t->local_tid)
4112 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4113 "sending keepalive for tunnel %d\n", t->id.tid);
4115 msg = (struct GNUNET_MESH_TunnelKeepAlive *) cbuf;
4116 msg->header.size = htons (size);
4117 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_KEEPALIVE);
4118 msg->oid = my_full_id;
4119 msg->tid = htonl (t->id.tid);
4120 send_prebuilt_message (&msg->header, t->next_hop, t);
4122 t->maintenance_task =
4123 GNUNET_SCHEDULER_add_delayed (refresh_path_time, &path_refresh, t);
4128 * Function to process paths received for a new peer addition. The recorded
4129 * paths form the initial tunnel, which can be optimized later.
4130 * Called on each result obtained for the DHT search.
4132 * @param cls closure
4133 * @param exp when will this value expire
4134 * @param key key of the result
4135 * @param get_path path of the get request
4136 * @param get_path_length lenght of get_path
4137 * @param put_path path of the put request
4138 * @param put_path_length length of the put_path
4139 * @param type type of the result
4140 * @param size number of bytes in data
4141 * @param data pointer to the result data
4144 dht_get_id_handler (void *cls, struct GNUNET_TIME_Absolute exp,
4145 const struct GNUNET_HashCode * key,
4146 const struct GNUNET_PeerIdentity *get_path,
4147 unsigned int get_path_length,
4148 const struct GNUNET_PeerIdentity *put_path,
4149 unsigned int put_path_length, enum GNUNET_BLOCK_Type type,
4150 size_t size, const void *data)
4152 struct MeshPeerInfo *peer = cls;
4153 struct MeshPeerPath *p;
4154 struct GNUNET_PeerIdentity pi;
4157 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got results from DHT!\n");
4158 GNUNET_PEER_resolve (peer->id, &pi);
4159 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " for %s\n", GNUNET_i2s (&pi));
4161 p = path_build_from_dht (get_path, get_path_length,
4162 put_path, put_path_length);
4163 path_add_to_peers (p, GNUNET_NO);
4165 for (i = 0; i < peer->ntunnels; i++)
4167 struct GNUNET_PeerIdentity id;
4169 GNUNET_PEER_resolve (peer->tunnels[i]->id.oid, &id);
4170 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ... tunnel %s:%X (%X / %X)\n",
4171 GNUNET_i2s (&id), peer->tunnels[i]->id.tid,
4172 peer->tunnels[i]->local_tid,
4173 peer->tunnels[i]->local_tid_dest);
4174 if (peer->tunnels[i]->state == MESH_TUNNEL_SEARCHING)
4176 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ... connect!\n");
4177 peer_connect (peer, peer->tunnels[i]);
4185 /******************************************************************************/
4186 /********************* MESH LOCAL HANDLES **************************/
4187 /******************************************************************************/
4191 * Handler for client disconnection
4193 * @param cls closure
4194 * @param client identification of the client; NULL
4195 * for the last call when the server is destroyed
4198 handle_local_client_disconnect (void *cls, struct GNUNET_SERVER_Client *client)
4200 struct MeshClient *c;
4201 struct MeshClient *next;
4203 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "client disconnected: %p\n", client);
4206 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " (SERVER DOWN)\n");
4213 if (c->handle != client)
4215 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4216 " ... searching %p (%u)\n",
4221 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "matching client found (%u)\n",
4223 GNUNET_SERVER_client_drop (c->handle);
4224 c->shutting_down = GNUNET_YES;
4225 GNUNET_CONTAINER_multihashmap_iterate (c->own_tunnels,
4226 &tunnel_destroy_iterator, c);
4227 GNUNET_CONTAINER_multihashmap_iterate (c->incoming_tunnels,
4228 &tunnel_destroy_iterator, c);
4229 GNUNET_CONTAINER_multihashmap_destroy (c->own_tunnels);
4230 GNUNET_CONTAINER_multihashmap_destroy (c->incoming_tunnels);
4232 if (NULL != c->ports)
4233 GNUNET_CONTAINER_multihashmap_destroy (c->ports);
4235 GNUNET_CONTAINER_DLL_remove (clients_head, clients_tail, c);
4236 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " CLIENT FREE at %p\n", c);
4238 GNUNET_STATISTICS_update (stats, "# clients", -1, GNUNET_NO);
4241 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "done!\n");
4247 * Handler for new clients
4249 * @param cls closure
4250 * @param client identification of the client
4251 * @param message the actual message, which includes messages the client wants
4254 handle_local_new_client (void *cls, struct GNUNET_SERVER_Client *client,
4255 const struct GNUNET_MessageHeader *message)
4257 struct GNUNET_MESH_ClientConnect *cc_msg;
4258 struct MeshClient *c;
4263 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "new client connected %p\n", client);
4265 /* Check data sanity */
4266 size = ntohs (message->size) - sizeof (struct GNUNET_MESH_ClientConnect);
4267 cc_msg = (struct GNUNET_MESH_ClientConnect *) message;
4268 if (0 != (size % sizeof (uint32_t)))
4271 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4274 size /= sizeof (uint32_t);
4276 /* Create new client structure */
4277 c = GNUNET_malloc (sizeof (struct MeshClient));
4278 c->id = next_client_id++; /* overflow not important: just for debug */
4279 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " client id %u\n", c->id);
4280 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " client has %u ports\n", size);
4282 GNUNET_SERVER_client_keep (client);
4286 struct GNUNET_HashCode hc;
4288 p = (uint32_t *) &cc_msg[1];
4289 c->ports = GNUNET_CONTAINER_multihashmap_create (size, GNUNET_NO);
4290 for (i = 0; i < size; i++)
4293 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " port: %u\n", u32);
4294 GMC_hash32 (u32, &hc);
4296 /* store in client's hashmap */
4297 GNUNET_CONTAINER_multihashmap_put (c->ports, &hc, c,
4298 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST);
4299 /* store in global hashmap */
4300 /* FIXME only allow one client to have the port open,
4301 * have a backup hashmap with waiting clients */
4302 GNUNET_CONTAINER_multihashmap_put (ports, &hc, c,
4303 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
4307 GNUNET_CONTAINER_DLL_insert (clients_head, clients_tail, c);
4308 c->own_tunnels = GNUNET_CONTAINER_multihashmap_create (32, GNUNET_NO);
4309 c->incoming_tunnels = GNUNET_CONTAINER_multihashmap_create (32, GNUNET_NO);
4310 GNUNET_SERVER_notification_context_add (nc, client);
4311 GNUNET_STATISTICS_update (stats, "# clients", 1, GNUNET_NO);
4313 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4314 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "new client processed\n");
4319 * Handler for requests of new tunnels
4321 * @param cls Closure.
4322 * @param client Identification of the client.
4323 * @param message The actual message.
4326 handle_local_tunnel_create (void *cls, struct GNUNET_SERVER_Client *client,
4327 const struct GNUNET_MessageHeader *message)
4329 struct GNUNET_MESH_TunnelMessage *t_msg;
4330 struct MeshPeerInfo *peer_info;
4331 struct MeshTunnel *t;
4332 struct MeshClient *c;
4333 MESH_TunnelNumber tid;
4335 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "new tunnel requested\n");
4337 /* Sanity check for client registration */
4338 if (NULL == (c = client_get (client)))
4341 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4344 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
4346 /* Message size sanity check */
4347 if (sizeof (struct GNUNET_MESH_TunnelMessage) != ntohs (message->size))
4350 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4354 t_msg = (struct GNUNET_MESH_TunnelMessage *) message;
4355 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " towards %s\n",
4356 GNUNET_i2s (&t_msg->peer));
4357 /* Sanity check for tunnel numbering */
4358 tid = ntohl (t_msg->tunnel_id);
4359 if (0 == (tid & GNUNET_MESH_LOCAL_TUNNEL_ID_CLI))
4362 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4365 /* Sanity check for duplicate tunnel IDs */
4366 if (NULL != tunnel_get_by_local_id (c, tid))
4369 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4374 while (NULL != tunnel_get_by_pi (myid, next_tid))
4375 next_tid = (next_tid + 1) & ~GNUNET_MESH_LOCAL_TUNNEL_ID_CLI;
4376 t = tunnel_new (myid, next_tid, c, tid);
4377 next_tid = (next_tid + 1) & ~GNUNET_MESH_LOCAL_TUNNEL_ID_CLI;
4381 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4384 t->port = ntohl (t_msg->port);
4385 tunnel_set_options (t, ntohl (t_msg->options));
4386 if (GNUNET_YES == t->reliable)
4387 t->sent_messages_fwd =
4388 GNUNET_CONTAINER_multihashmap32_create (t->queue_max);
4389 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "CREATED TUNNEL %s[%x]:%u (%x)\n",
4390 GNUNET_i2s (&my_full_id), t->id.tid, t->port, t->local_tid);
4392 peer_info = peer_get (&t_msg->peer);
4393 peer_info_add_tunnel (peer_info, t);
4394 peer_connect (peer_info, t);
4395 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4401 * Handler for requests of deleting tunnels
4403 * @param cls closure
4404 * @param client identification of the client
4405 * @param message the actual message
4408 handle_local_tunnel_destroy (void *cls, struct GNUNET_SERVER_Client *client,
4409 const struct GNUNET_MessageHeader *message)
4411 struct GNUNET_MESH_TunnelMessage *tunnel_msg;
4412 struct MeshClient *c;
4413 struct MeshTunnel *t;
4414 MESH_TunnelNumber tid;
4416 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4417 "Got a DESTROY TUNNEL from client!\n");
4419 /* Sanity check for client registration */
4420 if (NULL == (c = client_get (client)))
4423 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4426 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
4428 /* Message sanity check */
4429 if (sizeof (struct GNUNET_MESH_TunnelMessage) != ntohs (message->size))
4432 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4436 tunnel_msg = (struct GNUNET_MESH_TunnelMessage *) message;
4438 /* Retrieve tunnel */
4439 tid = ntohl (tunnel_msg->tunnel_id);
4440 t = tunnel_get_by_local_id(c, tid);
4443 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, " tunnel %X not found\n", tid);
4445 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4449 /* Cleanup after the tunnel */
4450 client_delete_tunnel (c, t);
4455 else if (c == t->owner)
4457 peer_info_remove_tunnel (peer_get_short (t->dest), t);
4461 /* The tunnel will be destroyed when the last message is transmitted. */
4462 tunnel_destroy_empty (t);
4464 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4470 * Handler for client traffic directed to one peer
4472 * @param cls closure
4473 * @param client identification of the client
4474 * @param message the actual message
4477 handle_local_unicast (void *cls, struct GNUNET_SERVER_Client *client,
4478 const struct GNUNET_MessageHeader *message)
4480 struct MeshClient *c;
4481 struct MeshTunnel *t;
4482 struct GNUNET_MESH_Data *data_msg;
4483 MESH_TunnelNumber tid;
4486 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4487 "Got a unicast request from a client!\n");
4489 /* Sanity check for client registration */
4490 if (NULL == (c = client_get (client)))
4493 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4496 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
4498 data_msg = (struct GNUNET_MESH_Data *) message;
4500 /* Sanity check for message size */
4501 size = ntohs (message->size);
4502 if (sizeof (struct GNUNET_MESH_Data) +
4503 sizeof (struct GNUNET_MessageHeader) > size)
4506 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4510 /* Tunnel exists? */
4511 tid = ntohl (data_msg->tid);
4512 t = tunnel_get_by_local_id (c, tid);
4516 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4520 /* Is it a local tunnel? Then, does client own the tunnel? */
4521 if (t->owner->handle != client)
4524 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4528 /* PID should be as expected: client<->service communication */
4529 if (ntohl (data_msg->pid) != t->prev_fc.last_pid_recv + 1)
4532 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
4533 "Unicast PID, expected %u, got %u\n",
4534 t->prev_fc.last_pid_recv + 1, ntohl (data_msg->pid));
4535 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4539 /* Ok, everything is correct, send the message
4540 * (pretend we got it from a mesh peer)
4543 struct MeshSentMessage *copy;
4544 struct GNUNET_MESH_Data *payload;
4546 copy = GNUNET_malloc (sizeof (struct MeshSentMessage) + size);
4547 copy->id = ntohl (data_msg->pid);
4548 copy->is_forward = GNUNET_YES;
4549 copy->retry_timer = GNUNET_TIME_UNIT_MINUTES;
4550 copy->retry_task = GNUNET_SCHEDULER_add_delayed (copy->retry_timer,
4551 &tunnel_retransmit_message,
4553 if (GNUNET_YES == t->reliable &&
4555 GNUNET_CONTAINER_multihashmap32_put (t->sent_messages_fwd,
4558 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST))
4561 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4564 payload = (struct GNUNET_MESH_Data *) ©[1];
4565 memcpy (payload, data_msg, size);
4566 payload->oid = my_full_id;
4567 payload->tid = htonl (t->id.tid);
4568 payload->ttl = htonl (default_ttl);
4569 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4570 " calling generic handler...\n");
4571 handle_mesh_unicast (NULL, &my_full_id, &payload->header);
4573 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "receive done OK\n");
4574 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4581 * Handler for client traffic directed to the origin
4583 * @param cls closure
4584 * @param client identification of the client
4585 * @param message the actual message
4588 handle_local_to_origin (void *cls, struct GNUNET_SERVER_Client *client,
4589 const struct GNUNET_MessageHeader *message)
4591 struct GNUNET_MESH_Data *data_msg;
4592 struct MeshFlowControl *fc;
4593 struct MeshClient *c;
4594 struct MeshTunnel *t;
4595 MESH_TunnelNumber tid;
4598 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4599 "Got a ToOrigin request from a client!\n");
4600 /* Sanity check for client registration */
4601 if (NULL == (c = client_get (client)))
4604 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4607 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
4609 data_msg = (struct GNUNET_MESH_Data *) message;
4611 /* Sanity check for message size */
4612 size = ntohs (message->size);
4613 if (sizeof (struct GNUNET_MESH_Data) +
4614 sizeof (struct GNUNET_MessageHeader) > size)
4617 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4621 /* Tunnel exists? */
4622 tid = ntohl (data_msg->tid);
4623 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " on tunnel %X\n", tid);
4624 if (tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
4627 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4630 t = tunnel_get_by_local_id (c, tid);
4633 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Tunnel %X unknown.\n", tid);
4634 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, " for client %u.\n", c->id);
4636 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4640 /* It should be sent by someone who has this as incoming tunnel. */
4644 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4648 /* PID should be as expected */
4650 if (ntohl (data_msg->pid) != fc->last_pid_recv + 1)
4653 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
4654 "To Origin PID, expected %u, got %u\n",
4655 fc->last_pid_recv + 1,
4656 ntohl (data_msg->pid));
4657 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4661 /* Ok, everything is correct, send the message
4662 * (pretend we got it from a mesh peer)
4665 struct MeshSentMessage *copy;
4666 struct GNUNET_MESH_Data *payload;
4668 copy = GNUNET_malloc (sizeof (struct MeshSentMessage) + size);
4669 copy->id = ntohl (data_msg->pid);
4670 copy->is_forward = GNUNET_NO;
4671 copy->retry_timer = GNUNET_TIME_UNIT_MINUTES;
4672 copy->retry_task = GNUNET_SCHEDULER_add_delayed (copy->retry_timer,
4673 &tunnel_retransmit_message,
4675 if (GNUNET_YES == t->reliable &&
4677 GNUNET_CONTAINER_multihashmap32_put (t->sent_messages_bck,
4680 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST))
4683 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4686 payload = (struct GNUNET_MESH_Data *) ©[1];
4687 memcpy (payload, data_msg, size);
4688 GNUNET_PEER_resolve (t->id.oid, &payload->oid);
4689 payload->tid = htonl (t->id.tid);
4690 payload->ttl = htonl (default_ttl);
4692 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4693 " calling generic handler...\n");
4694 handle_mesh_to_orig (NULL, &my_full_id, &payload->header);
4696 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4703 * Handler for client's ACKs for payload traffic.
4705 * @param cls Closure (unused).
4706 * @param client Identification of the client.
4707 * @param message The actual message.
4710 handle_local_ack (void *cls, struct GNUNET_SERVER_Client *client,
4711 const struct GNUNET_MessageHeader *message)
4713 struct GNUNET_MESH_LocalAck *msg;
4714 struct MeshTunnel *t;
4715 struct MeshClient *c;
4716 MESH_TunnelNumber tid;
4719 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got a local ACK\n");
4720 /* Sanity check for client registration */
4721 if (NULL == (c = client_get (client)))
4724 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4727 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
4729 msg = (struct GNUNET_MESH_LocalAck *) message;
4731 /* Tunnel exists? */
4732 tid = ntohl (msg->tunnel_id);
4733 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " on tunnel %X\n", tid);
4734 t = tunnel_get_by_local_id (c, tid);
4738 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Tunnel %X unknown.\n", tid);
4739 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, " for client %u.\n", c->id);
4740 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4744 ack = ntohl (msg->ack);
4745 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ack %u\n", ack);
4747 /* Does client own tunnel? I.E: Is this an ACK for BCK traffic? */
4750 /* The client owns the tunnel, ACK is for data to_origin, send BCK ACK. */
4751 t->prev_fc.last_ack_recv = ack;
4752 tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK);
4756 /* The client doesn't own the tunnel, this ACK is for FWD traffic. */
4757 t->next_fc.last_ack_recv = ack;
4758 tunnel_send_fwd_ack (t, GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK);
4761 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4769 * Iterator over all tunnels to send a monitoring client info about each tunnel.
4771 * @param cls Closure (client handle).
4772 * @param key Key (hashed tunnel ID, unused).
4773 * @param value Tunnel info.
4775 * @return GNUNET_YES, to keep iterating.
4778 monitor_all_tunnels_iterator (void *cls,
4779 const struct GNUNET_HashCode * key,
4782 struct GNUNET_SERVER_Client *client = cls;
4783 struct MeshTunnel *t = value;
4784 struct GNUNET_MESH_LocalMonitor *msg;
4786 msg = GNUNET_malloc (sizeof(struct GNUNET_MESH_LocalMonitor));
4787 GNUNET_PEER_resolve(t->id.oid, &msg->owner);
4788 msg->tunnel_id = htonl (t->id.tid);
4789 msg->header.size = htons (sizeof (struct GNUNET_MESH_LocalMonitor));
4790 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_TUNNELS);
4791 GNUNET_PEER_resolve (t->dest, &msg->destination);
4793 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4794 "* sending info about tunnel %s [%u]\n",
4795 GNUNET_i2s (&msg->owner), t->id.tid);
4797 GNUNET_SERVER_notification_context_unicast (nc, client,
4798 &msg->header, GNUNET_NO);
4804 * Handler for client's MONITOR request.
4806 * @param cls Closure (unused).
4807 * @param client Identification of the client.
4808 * @param message The actual message.
4811 handle_local_get_tunnels (void *cls, struct GNUNET_SERVER_Client *client,
4812 const struct GNUNET_MessageHeader *message)
4814 struct MeshClient *c;
4816 /* Sanity check for client registration */
4817 if (NULL == (c = client_get (client)))
4820 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4824 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4825 "Received get tunnels request from client %u\n",
4827 GNUNET_CONTAINER_multihashmap_iterate (tunnels,
4828 monitor_all_tunnels_iterator,
4830 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4831 "Get tunnels request from client %u completed\n",
4833 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4838 * Handler for client's MONITOR_TUNNEL request.
4840 * @param cls Closure (unused).
4841 * @param client Identification of the client.
4842 * @param message The actual message.
4845 handle_local_show_tunnel (void *cls, struct GNUNET_SERVER_Client *client,
4846 const struct GNUNET_MessageHeader *message)
4848 const struct GNUNET_MESH_LocalMonitor *msg;
4849 struct GNUNET_MESH_LocalMonitor *resp;
4850 struct MeshClient *c;
4851 struct MeshTunnel *t;
4853 /* Sanity check for client registration */
4854 if (NULL == (c = client_get (client)))
4857 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4861 msg = (struct GNUNET_MESH_LocalMonitor *) message;
4862 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4863 "Received tunnel info request from client %u for tunnel %s[%X]\n",
4866 ntohl (msg->tunnel_id));
4867 t = tunnel_get (&msg->owner, ntohl (msg->tunnel_id));
4870 /* We don't know the tunnel FIXME */
4871 struct GNUNET_MESH_LocalMonitor warn;
4874 GNUNET_SERVER_notification_context_unicast (nc, client,
4877 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4881 /* Initialize context */
4882 resp = GNUNET_malloc (sizeof (struct GNUNET_MESH_LocalMonitor));
4884 GNUNET_PEER_resolve (t->dest, &resp->destination);
4885 resp->header.size = htons (sizeof (struct GNUNET_MESH_LocalMonitor));
4886 GNUNET_SERVER_notification_context_unicast (nc, c->handle,
4887 &resp->header, GNUNET_NO);
4890 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4891 "Monitor tunnel request from client %u completed\n",
4893 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4898 * Functions to handle messages from clients
4900 static struct GNUNET_SERVER_MessageHandler client_handlers[] = {
4901 {&handle_local_new_client, NULL,
4902 GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT, 0},
4903 {&handle_local_tunnel_create, NULL,
4904 GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE,
4905 sizeof (struct GNUNET_MESH_TunnelMessage)},
4906 {&handle_local_tunnel_destroy, NULL,
4907 GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY,
4908 sizeof (struct GNUNET_MESH_TunnelMessage)},
4909 {&handle_local_unicast, NULL,
4910 GNUNET_MESSAGE_TYPE_MESH_UNICAST, 0},
4911 {&handle_local_to_origin, NULL,
4912 GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN, 0},
4913 {&handle_local_ack, NULL,
4914 GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK,
4915 sizeof (struct GNUNET_MESH_LocalAck)},
4916 {&handle_local_get_tunnels, NULL,
4917 GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_TUNNELS,
4918 sizeof (struct GNUNET_MessageHeader)},
4919 {&handle_local_show_tunnel, NULL,
4920 GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_TUNNEL,
4921 sizeof (struct GNUNET_MESH_LocalMonitor)},
4927 * Method called whenever a given peer connects.
4929 * @param cls closure
4930 * @param peer peer identity this notification is about
4933 core_connect (void *cls, const struct GNUNET_PeerIdentity *peer)
4935 struct MeshPeerInfo *peer_info;
4936 struct MeshPeerPath *path;
4938 DEBUG_CONN ("Peer connected\n");
4939 DEBUG_CONN (" %s\n", GNUNET_i2s (&my_full_id));
4940 peer_info = peer_get (peer);
4941 if (myid == peer_info->id)
4943 DEBUG_CONN (" (self)\n");
4944 path = path_new (1);
4948 DEBUG_CONN (" %s\n", GNUNET_i2s (peer));
4949 path = path_new (2);
4950 path->peers[1] = peer_info->id;
4951 GNUNET_PEER_change_rc (peer_info->id, 1);
4952 GNUNET_STATISTICS_update (stats, "# peers", 1, GNUNET_NO);
4954 path->peers[0] = myid;
4955 GNUNET_PEER_change_rc (myid, 1);
4956 peer_info_add_path (peer_info, path, GNUNET_YES);
4962 * Method called whenever a peer disconnects.
4964 * @param cls closure
4965 * @param peer peer identity this notification is about
4968 core_disconnect (void *cls, const struct GNUNET_PeerIdentity *peer)
4970 struct MeshPeerInfo *pi;
4971 struct MeshPeerQueue *q;
4972 struct MeshPeerQueue *n;
4974 DEBUG_CONN ("Peer disconnected\n");
4975 pi = GNUNET_CONTAINER_multihashmap_get (peers, &peer->hashPubKey);
4985 /* TODO try to reroute this traffic instead */
4986 queue_destroy(q, GNUNET_YES);
4989 if (NULL != pi->core_transmit)
4991 GNUNET_CORE_notify_transmit_ready_cancel(pi->core_transmit);
4992 pi->core_transmit = NULL;
4994 peer_remove_path (pi, pi->id, myid);
4997 DEBUG_CONN (" (self)\n");
4999 GNUNET_STATISTICS_update (stats, "# peers", -1, GNUNET_NO);
5005 * Install server (service) handlers and start listening to clients.
5010 GNUNET_SERVER_add_handlers (server_handle, client_handlers);
5011 GNUNET_SERVER_disconnect_notify (server_handle,
5012 &handle_local_client_disconnect, NULL);
5013 nc = GNUNET_SERVER_notification_context_create (server_handle, 1);
5015 clients_head = NULL;
5016 clients_tail = NULL;
5018 GNUNET_SERVER_resume (server_handle);
5023 * To be called on core init/fail.
5025 * @param cls Closure (config)
5026 * @param server handle to the server for this service
5027 * @param identity the public identity of this peer
5030 core_init (void *cls, struct GNUNET_CORE_Handle *server,
5031 const struct GNUNET_PeerIdentity *identity)
5033 const struct GNUNET_CONFIGURATION_Handle *c = cls;
5036 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Core init\n");
5037 GNUNET_break (core_handle == server);
5038 if (0 != memcmp (identity, &my_full_id, sizeof (my_full_id)) ||
5041 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, _("Wrong CORE service\n"));
5042 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5044 GNUNET_i2s (identity));
5045 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5047 GNUNET_i2s (&my_full_id));
5048 GNUNET_CORE_disconnect (core_handle);
5049 core_handle = GNUNET_CORE_connect (c, /* Main configuration */
5050 NULL, /* Closure passed to MESH functions */
5051 &core_init, /* Call core_init once connected */
5052 &core_connect, /* Handle connects */
5053 &core_disconnect, /* remove peers on disconnects */
5054 NULL, /* Don't notify about all incoming messages */
5055 GNUNET_NO, /* For header only in notification */
5056 NULL, /* Don't notify about all outbound messages */
5057 GNUNET_NO, /* For header-only out notification */
5058 core_handlers); /* Register these handlers */
5067 /******************************************************************************/
5068 /************************ MAIN FUNCTIONS ****************************/
5069 /******************************************************************************/
5072 * Iterator over tunnel hash map entries to destroy the tunnel during shutdown.
5074 * @param cls closure
5075 * @param key current key code
5076 * @param value value in the hash map
5077 * @return GNUNET_YES if we should continue to iterate,
5081 shutdown_tunnel (void *cls, const struct GNUNET_HashCode * key, void *value)
5083 struct MeshTunnel *t = value;
5090 * Iterator over peer hash map entries to destroy the tunnel during shutdown.
5092 * @param cls closure
5093 * @param key current key code
5094 * @param value value in the hash map
5095 * @return GNUNET_YES if we should continue to iterate,
5099 shutdown_peer (void *cls, const struct GNUNET_HashCode * key, void *value)
5101 struct MeshPeerInfo *p = value;
5102 struct MeshPeerQueue *q;
5103 struct MeshPeerQueue *n;
5111 queue_destroy(q, GNUNET_YES);
5115 peer_info_destroy (p);
5121 * Task run during shutdown.
5127 shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
5129 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "shutting down\n");
5131 if (core_handle != NULL)
5133 GNUNET_CORE_disconnect (core_handle);
5138 GNUNET_CRYPTO_ecc_key_create_stop (keygen);
5141 GNUNET_CONTAINER_multihashmap_iterate (tunnels, &shutdown_tunnel, NULL);
5142 GNUNET_CONTAINER_multihashmap_iterate (peers, &shutdown_peer, NULL);
5143 if (dht_handle != NULL)
5145 GNUNET_DHT_disconnect (dht_handle);
5150 GNUNET_SERVER_notification_context_destroy (nc);
5153 if (GNUNET_SCHEDULER_NO_TASK != announce_id_task)
5155 GNUNET_SCHEDULER_cancel (announce_id_task);
5156 announce_id_task = GNUNET_SCHEDULER_NO_TASK;
5158 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "shut down\n");
5163 * Callback for hostkey read/generation.
5165 * @param cls Closure (Configuration handle).
5166 * @param pk The ECC private key.
5167 * @param emsg Error message, if any.
5170 key_generation_cb (void *cls,
5171 struct GNUNET_CRYPTO_EccPrivateKey *pk,
5174 const struct GNUNET_CONFIGURATION_Handle *c = cls;
5179 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
5180 _("Could not access hostkey: %s. Exiting.\n"),
5182 GNUNET_SCHEDULER_shutdown ();
5185 my_private_key = pk;
5186 GNUNET_CRYPTO_ecc_key_get_public (my_private_key, &my_public_key);
5187 GNUNET_CRYPTO_hash (&my_public_key, sizeof (my_public_key),
5188 &my_full_id.hashPubKey);
5189 myid = GNUNET_PEER_intern (&my_full_id);
5190 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
5191 "Mesh for peer [%s] starting\n",
5192 GNUNET_i2s(&my_full_id));
5194 core_handle = GNUNET_CORE_connect (c, /* Main configuration */
5195 NULL, /* Closure passed to MESH functions */
5196 &core_init, /* Call core_init once connected */
5197 &core_connect, /* Handle connects */
5198 &core_disconnect, /* remove peers on disconnects */
5199 NULL, /* Don't notify about all incoming messages */
5200 GNUNET_NO, /* For header only in notification */
5201 NULL, /* Don't notify about all outbound messages */
5202 GNUNET_NO, /* For header-only out notification */
5203 core_handlers); /* Register these handlers */
5204 if (core_handle == NULL)
5207 GNUNET_SCHEDULER_shutdown ();
5212 next_local_tid = GNUNET_MESH_LOCAL_TUNNEL_ID_SERV;
5214 announce_id_task = GNUNET_SCHEDULER_add_now (&announce_id, cls);
5216 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Mesh service running\n");
5221 * Process mesh requests.
5223 * @param cls closure
5224 * @param server the initialized server
5225 * @param c configuration to use
5228 run (void *cls, struct GNUNET_SERVER_Handle *server,
5229 const struct GNUNET_CONFIGURATION_Handle *c)
5233 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "starting to run\n");
5234 server_handle = server;
5235 GNUNET_SERVER_suspend (server_handle);
5238 GNUNET_CONFIGURATION_get_value_filename (c, "PEER", "PRIVATE_KEY",
5241 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5243 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
5244 "mesh", "peer/privatekey");
5245 GNUNET_SCHEDULER_shutdown ();
5250 GNUNET_CONFIGURATION_get_value_time (c, "MESH", "REFRESH_PATH_TIME",
5251 &refresh_path_time))
5253 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5255 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
5256 "mesh", "refresh path time");
5257 GNUNET_SCHEDULER_shutdown ();
5262 GNUNET_CONFIGURATION_get_value_time (c, "MESH", "ID_ANNOUNCE_TIME",
5265 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5267 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
5268 "mesh", "id announce time");
5269 GNUNET_SCHEDULER_shutdown ();
5274 GNUNET_CONFIGURATION_get_value_time (c, "MESH", "CONNECT_TIMEOUT",
5277 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5279 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
5280 "mesh", "connect timeout");
5281 GNUNET_SCHEDULER_shutdown ();
5286 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "MAX_MSGS_QUEUE",
5289 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5291 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
5292 "mesh", "max msgs queue");
5293 GNUNET_SCHEDULER_shutdown ();
5298 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "MAX_TUNNELS",
5301 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5303 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
5304 "mesh", "max tunnels");
5305 GNUNET_SCHEDULER_shutdown ();
5310 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "DEFAULT_TTL",
5313 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
5315 ("%s service is lacking key configuration settings (%s). Using default (%u).\n"),
5316 "mesh", "default ttl", 64);
5321 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "MAX_PEERS",
5324 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
5325 _("%s service is lacking key configuration settings (%s). Using default (%u).\n"),
5326 "mesh", "max peers", 1000);
5331 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "DROP_PERCENT",
5338 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
5339 "Mesh is running with drop mode enabled. "
5340 "This is NOT a good idea! "
5341 "Remove the DROP_PERCENT option from your configuration.\n");
5345 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "DHT_REPLICATION_LEVEL",
5346 &dht_replication_level))
5348 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
5350 ("%s service is lacking key configuration settings (%s). Using default (%u).\n"),
5351 "mesh", "dht replication level", 3);
5352 dht_replication_level = 3;
5355 tunnels = GNUNET_CONTAINER_multihashmap_create (32, GNUNET_NO);
5356 incoming_tunnels = GNUNET_CONTAINER_multihashmap_create (32, GNUNET_NO);
5357 peers = GNUNET_CONTAINER_multihashmap_create (32, GNUNET_NO);
5358 ports = GNUNET_CONTAINER_multihashmap_create (32, GNUNET_NO);
5360 dht_handle = GNUNET_DHT_connect (c, 64);
5361 if (NULL == dht_handle)
5365 stats = GNUNET_STATISTICS_create ("mesh", c);
5367 /* Scheduled the task to clean up when shutdown is called */
5368 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &shutdown_task,
5370 keygen = GNUNET_CRYPTO_ecc_key_create_start (keyfile,
5373 GNUNET_free (keyfile);
5378 * The main function for the mesh service.
5380 * @param argc number of arguments from the command line
5381 * @param argv command line arguments
5382 * @return 0 ok, 1 on error
5385 main (int argc, char *const *argv)
5390 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "main()\n");
5391 r = GNUNET_SERVICE_run (argc, argv, "mesh", GNUNET_SERVICE_OPTION_NONE, &run,
5393 ret = (GNUNET_OK == r) ? 0 : 1;
5394 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "main() END\n");
5398 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
5399 "Mesh for peer [%s] FWD ACKs %u, BCK ACKs %u\n",
5400 GNUNET_i2s(&my_full_id), debug_fwd_ack, debug_bck_ack);