2 This file is part of GNUnet.
3 (C) 2001-2013 Christian Grothoff (and other contributing authors)
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22 * @file mesh/gnunet-service-mesh-enc.c
23 * @brief GNUnet MESH service with encryption
24 * @author Bartlomiej Polot
27 * - when sending in-order buffered data, wait for client ACKs
32 * - relay corking down to core
33 * - set ttl relative to path length
37 * - peer: other mesh instance. If there is direct connection it's a neighbor.
38 * - tunnel: encrypted connection to a peer, neighbor or not.
39 * - channel: connection between two clients, on the same or different peers.
40 * have properties like reliability.
41 * - path: series of directly connected peer from one peer to another.
42 * - connection: path which is being used in a tunnel.
46 #include "gnunet_crypto_lib.h"
48 #include "mesh_protocol_enc.h"
49 #include "mesh_path.h"
50 #include "block_mesh.h"
51 #include "gnunet_dht_service.h"
52 #include "gnunet_statistics_service.h"
54 #define MESH_BLOOM_SIZE 128
56 #define MESH_DEBUG_DHT GNUNET_NO
57 #define MESH_DEBUG_CONNECTION GNUNET_NO
58 #define MESH_DEBUG_TIMING __LINUX__ && GNUNET_NO
60 #define MESH_MAX_POLL_TIME GNUNET_TIME_relative_multiply (\
61 GNUNET_TIME_UNIT_MINUTES,\
63 #define MESH_RETRANSMIT_TIME GNUNET_TIME_UNIT_SECONDS
64 #define MESH_RETRANSMIT_MARGIN 4
66 #if MESH_DEBUG_CONNECTION
67 #define DEBUG_CONN(...) GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, __VA_ARGS__)
69 #define DEBUG_CONN(...)
73 #define DEBUG_DHT(...) GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, __VA_ARGS__)
75 #define DEBUG_DHT(...)
82 struct timespec __mesh_start;
83 struct timespec __mesh_end;
84 #define INTERVAL_START clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &(__mesh_start))
85 #define INTERVAL_END \
87 clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &(__mesh_end));\
88 double __diff = __mesh_end.tv_nsec - __mesh_start.tv_nsec;\
89 if (__diff < 0) __diff += 1000000000;\
93 #define INTERVAL_SHOW \
95 GNUNET_log (GNUNET_ERROR_TYPE_INFO, "AVG process time: %f ns\n", __sum/__count)
97 #define INTERVAL_START
103 * All the states a tunnel can be in.
108 * Uninitialized status, should never appear in operation.
113 * Path to the peer not known yet
115 MESH_TUNNEL_SEARCHING,
118 * Request sent, not yet answered.
123 * Peer connected and ready to accept data
128 * Peer connected previosly but not responding
130 MESH_TUNNEL_RECONNECTING
135 * All the states a connection can be in.
137 enum MeshConnectionState
140 * Uninitialized status, should never appear in operation.
145 * Connection created, waiting for ACK.
147 MESH_CONNECTION_SENT,
150 * Connection confirmed, ready to carry traffic..
152 MESH_CONNECTION_READY,
156 /******************************************************************************/
157 /************************ DATA STRUCTURES ****************************/
158 /******************************************************************************/
160 /** FWD declaration */
164 struct MeshConnection;
166 struct MeshChannelReliability;
170 * Struct containing info about a queued transmission to this peer
177 struct MeshPeerQueue *next;
182 struct MeshPeerQueue *prev;
185 * Peer this transmission is directed to.
187 struct MeshPeer *peer;
190 * Connection this message belongs to.
192 struct MeshConnection *c;
195 * Channel this message belongs to, if known.
197 struct MeshChannel *ch;
200 * Pointer to info stucture used as cls.
210 * Size of the message
217 * Struct to encapsulate all the Flow Control information to a peer to which
218 * we are directly connected (on a core level).
220 struct MeshFlowControl
225 struct MeshPeer *peer;
228 * Transmission queue to core DLL head
230 struct MeshPeerQueue *queue_head;
233 * Transmission queue to core DLL tail
235 struct MeshPeerQueue *queue_tail;
238 * How many messages are in the queue to this peer.
240 unsigned int queue_n;
243 * How many messages do we accept in the queue.
245 unsigned int queue_max;
248 * Handle for queued transmissions
250 struct GNUNET_CORE_TransmitHandle *core_transmit;
253 * ID of the last packet sent towards the peer.
255 uint32_t last_pid_sent;
258 * ID of the last packet received from the peer.
260 uint32_t last_pid_recv;
263 * Last ACK sent to the peer (peer can't send more than this PID).
265 uint32_t last_ack_sent;
268 * Last ACK sent towards the origin (for traffic towards leaf node).
270 uint32_t last_ack_recv;
273 * Task to poll the peer in case of a lost ACK causes stall.
275 GNUNET_SCHEDULER_TaskIdentifier poll_task;
278 * How frequently to poll for ACKs.
280 struct GNUNET_TIME_Relative poll_time;
285 * Struct containing all information regarding a given peer
295 * Last time we heard from this peer
297 struct GNUNET_TIME_Absolute last_contact;
300 * Number of attempts to reconnect so far
302 int n_reconnect_attempts;
305 * Paths to reach the peer, ordered by ascending hop count
307 struct MeshPeerPath *path_head;
310 * Paths to reach the peer, ordered by ascending hop count
312 struct MeshPeerPath *path_tail;
315 * Handle to stop the DHT search for paths to this peer
317 struct GNUNET_DHT_GetHandle *dhtget;
320 * Tunnel to this peer, if any.
322 struct MeshTunnel2 *tunnel;
325 * Flow control information for direct traffic.
327 struct MeshFlowControl *fc;
333 * Info needed to retry a message in case it gets lost.
335 struct MeshReliableMessage
338 * Double linked list, FIFO style
340 struct MeshReliableMessage *next;
341 struct MeshReliableMessage *prev;
344 * Tunnel Reliability queue this message is in.
346 struct MeshChannelReliability *rel;
349 * ID of the message (ACK needed to free)
354 * When was this message issued (to calculate ACK delay)
356 struct GNUNET_TIME_Absolute timestamp;
358 /* struct GNUNET_MESH_Data with payload */
362 struct MeshChannelReliability
365 * Channel this is about.
367 struct MeshChannel *ch;
370 * DLL of messages sent and not yet ACK'd.
372 struct MeshReliableMessage *head_sent;
373 struct MeshReliableMessage *tail_sent;
386 * DLL of messages received out of order.
388 struct MeshReliableMessage *head_recv;
389 struct MeshReliableMessage *tail_recv;
397 * Task to resend/poll in case no ACK is received.
399 GNUNET_SCHEDULER_TaskIdentifier retry_task;
402 * Counter for exponential backoff.
404 struct GNUNET_TIME_Relative retry_timer;
407 * How long does it usually take to get an ACK.
409 struct GNUNET_TIME_Relative expected_delay;
414 * Struct containing all information regarding a channel to a remote client.
419 * Tunnel this channel is in.
421 struct MeshTunnel2 *t;
424 * Double linked list.
426 struct MeshChannel *next;
427 struct MeshChannel *prev;
430 * Destination port of the channel.
435 * Local tunnel number ( >= GNUNET_MESH_LOCAL_CHANNEL_ID_CLI or 0 )
437 MESH_ChannelNumber id;
440 * Local tunnel number for local destination clients (incoming number)
441 * ( >= GNUNET_MESH_LOCAL_CHANNEL_ID_SERV or 0). All clients share the same
444 MESH_ChannelNumber id_dest;
447 * Is the tunnel bufferless (minimum latency)?
452 * Is the tunnel reliable?
457 * Last time the channel was used
459 struct GNUNET_TIME_Absolute timestamp;
462 * Client owner of the tunnel, if any
464 struct MeshClient *owner;
467 * Client destination of the tunnel, if any.
469 struct MeshClient *client;
472 * Flag to signal the destruction of the channel.
473 * If this is set GNUNET_YES the channel will be destroyed
474 * when the queue is empty.
479 * Total messages pending for this channel, payload or not.
481 unsigned int pending_messages;
485 * Only present (non-NULL) at the owner of a tunnel.
487 struct MeshChannelReliability *fwd_rel;
491 * Only present (non-NULL) at the destination of a tunnel.
493 struct MeshChannelReliability *bck_rel;
497 struct MeshConnection
502 struct MeshConnection *next;
503 struct MeshConnection *prev;
506 * Tunnel this connection is part of.
508 struct MeshTunnel2 *t;
516 * State of the connection.
518 enum MeshConnectionState state;
521 * Path being used for the tunnel.
523 struct MeshPeerPath *path;
526 * Position of the local peer in the path.
528 unsigned int own_pos;
531 * Task to keep the used paths alive at the owner,
532 * time tunnel out on all the other peers.
534 GNUNET_SCHEDULER_TaskIdentifier fwd_maintenance_task;
537 * Task to keep the used paths alive at the destination,
538 * time tunnel out on all the other peers.
540 GNUNET_SCHEDULER_TaskIdentifier bck_maintenance_task;
543 * Pending message count.
545 int pending_messages;
548 * Destroy flag: if true, destroy on last message.
555 * Struct containing all information regarding a tunnel to a peer.
560 * Endpoint of the tunnel.
562 struct MeshPeer *peer;
567 struct GNUNET_HashCode id;
570 * State of the tunnel.
572 enum MeshTunnelState state;
575 * Local peer ephemeral private key
577 struct GNUNET_CRYPTO_EccPrivateKey *my_eph_key;
580 * Local peer ephemeral public key
582 struct GNUNET_CRYPTO_EccPublicKeyBinaryEncoded *my_eph;
585 * Remote peer's public key.
587 struct GNUNET_CRYPTO_EccPublicKeyBinaryEncoded *peers_eph;
590 * Encryption ("our") key.
592 struct GNUNET_CRYPTO_AesSessionKey e_key;
595 * Decryption ("their") key.
597 struct GNUNET_CRYPTO_AesSessionKey d_key;
600 * Paths that are actively used to reach the destination peer.
602 struct MeshConnection *connection_head;
603 struct MeshConnection *connection_tail;
606 * Next connection number.
611 * Channels inside this tunnel.
613 struct MeshChannel *channel_head;
614 struct MeshChannel *channel_tail;
617 * Channel ID for the next created tunnel.
619 MESH_ChannelNumber next_chid;
622 * Channel ID for the next incoming tunnel.
624 MESH_ChannelNumber next_local_chid;
627 * Pending message count.
629 int pending_messages;
632 * Destroy flag: if true, destroy on last message.
640 * Struct containing information about a client of the service
642 * TODO: add a list of 'waiting' ports
649 struct MeshClient *next;
654 struct MeshClient *prev;
657 * Tunnels that belong to this client, indexed by local id
659 struct GNUNET_CONTAINER_MultiHashMap32 *own_channels;
662 * Tunnels this client has accepted, indexed by incoming local id
664 struct GNUNET_CONTAINER_MultiHashMap32 *incoming_channels;
667 * Handle to communicate with the client
669 struct GNUNET_SERVER_Client *handle;
672 * Ports that this client has declared interest in.
673 * Indexed by port, contains *Client.
675 struct GNUNET_CONTAINER_MultiHashMap32 *ports;
678 * Whether the client is active or shutting down (don't send confirmations
679 * to a client that is shutting down.
684 * ID of the client, mainly for debug messages
690 /******************************************************************************/
691 /************************ DEBUG FUNCTIONS ****************************/
692 /******************************************************************************/
696 * GNUNET_SCHEDULER_Task for printing a message after some operation is done
697 * @param cls string to print
698 * @param success GNUNET_OK if the PUT was transmitted,
699 * GNUNET_NO on timeout,
700 * GNUNET_SYSERR on disconnect from service
701 * after the PUT message was transmitted
702 * (so we don't know if it was received or not)
707 mesh_debug (void *cls, int success)
711 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "%s (%d)\n", s, success);
717 /******************************************************************************/
718 /*********************** GLOBAL VARIABLES ****************************/
719 /******************************************************************************/
721 /************************** Configuration parameters **************************/
724 * How often to send path keepalives. Paths timeout after 4 missed.
726 static struct GNUNET_TIME_Relative refresh_connection_time;
729 * How often to PUT own ID in the DHT.
731 static struct GNUNET_TIME_Relative id_announce_time;
734 * Maximum time allowed to connect to a peer found by string.
736 static struct GNUNET_TIME_Relative connect_timeout;
739 * Default TTL for payload packets.
741 static unsigned long long default_ttl;
744 * DHT replication level, see DHT API: GNUNET_DHT_get_start, GNUNET_DHT_put.
746 static unsigned long long dht_replication_level;
749 * How many tunnels are we willing to maintain.
750 * Local tunnels are always allowed, even if there are more tunnels than max.
752 static unsigned long long max_tunnels;
755 * How many messages *in total* are we willing to queue, divided by number of
756 * tunnels to get tunnel queue size.
758 static unsigned long long max_msgs_queue;
761 * How many peers do we want to remember?
763 static unsigned long long max_peers;
766 * Percentage of messages that will be dropped (for test purposes only).
768 static unsigned long long drop_percent;
770 /*************************** Static global variables **************************/
773 * DLL with all the clients, head.
775 static struct MeshClient *clients_head;
778 * DLL with all the clients, tail.
780 static struct MeshClient *clients_tail;
783 * Tunnels known, indexed by MESH_TunnelID (MeshTunnel).
785 static struct GNUNET_CONTAINER_MultiHashMap *tunnels;
788 * Peers known, indexed by PeerIdentity (MeshPeer).
790 static struct GNUNET_CONTAINER_MultiHashMap *peers;
793 * Handle to communicate with core.
795 static struct GNUNET_CORE_Handle *core_handle;
800 static struct GNUNET_DHT_Handle *dht_handle;
803 * Handle to server lib.
805 static struct GNUNET_SERVER_Handle *server_handle;
808 * Handle to the statistics service.
810 static struct GNUNET_STATISTICS_Handle *stats;
813 * Notification context, to send messages to local clients.
815 static struct GNUNET_SERVER_NotificationContext *nc;
818 * Local peer own ID (memory efficient handle).
820 static GNUNET_PEER_Id myid;
823 * Local peer own ID (full value).
825 static struct GNUNET_PeerIdentity my_full_id;
830 static struct GNUNET_CRYPTO_EccPrivateKey *my_private_key;
835 static struct GNUNET_CRYPTO_EccPublicKeyBinaryEncoded my_public_key;
838 * All ports clients of this peer have opened.
840 static struct GNUNET_CONTAINER_MultiHashMap32 *ports;
843 * Task to periodically announce itself in the network.
845 GNUNET_SCHEDULER_TaskIdentifier announce_id_task;
848 * Next ID to assign to a client.
850 unsigned int next_client_id;
853 /******************************************************************************/
854 /*********************** DECLARATIONS **************************/
855 /******************************************************************************/
858 * Function to process paths received for a new peer addition. The recorded
859 * paths form the initial tunnel, which can be optimized later.
860 * Called on each result obtained for the DHT search.
863 * @param exp when will this value expire
864 * @param key key of the result
865 * @param type type of the result
866 * @param size number of bytes in data
867 * @param data pointer to the result data
870 dht_get_id_handler (void *cls, struct GNUNET_TIME_Absolute exp,
871 const struct GNUNET_HashCode * key,
872 const struct GNUNET_PeerIdentity *get_path,
873 unsigned int get_path_length,
874 const struct GNUNET_PeerIdentity *put_path,
875 unsigned int put_path_length, enum GNUNET_BLOCK_Type type,
876 size_t size, const void *data);
880 * Retrieve the MeshPeer stucture associated with the peer, create one
881 * and insert it in the appropriate structures if the peer is not known yet.
883 * @param peer Full identity of the peer.
885 * @return Existing or newly created peer info.
887 static struct MeshPeer *
888 peer_get (const struct GNUNET_PeerIdentity *peer);
892 * Retrieve the MeshPeer stucture associated with the peer, create one
893 * and insert it in the appropriate structures if the peer is not known yet.
895 * @param peer Short identity of the peer.
897 * @return Existing or newly created peer info.
899 static struct MeshPeer *
900 peer_get_short (const GNUNET_PEER_Id peer);
904 * Build a PeerPath from the paths returned from the DHT, reversing the paths
905 * to obtain a local peer -> destination path and interning the peer ids.
907 * @return Newly allocated and created path
909 static struct MeshPeerPath *
910 path_build_from_dht (const struct GNUNET_PeerIdentity *get_path,
911 unsigned int get_path_length,
912 const struct GNUNET_PeerIdentity *put_path,
913 unsigned int put_path_length);
917 * Adds a path to the data structs of all the peers in the path
919 * @param p Path to process.
920 * @param confirmed Whether we know if the path works or not.
923 path_add_to_peers (struct MeshPeerPath *p, int confirmed);
927 * Search for a tunnel by global ID using full PeerIdentities.
929 * @param t Tunnel containing the channel.
930 * @param chid Public channel number.
932 * @return channel handler, NULL if doesn't exist
934 static struct MeshChannel *
935 channel_get (struct MeshTunnel2 *t, MESH_ChannelNumber chid);
939 * Change the tunnel state.
941 * @param t Tunnel whose state to change.
942 * @param state New state.
945 tunnel_change_state (struct MeshTunnel2 *t, enum MeshTunnelState state);
949 * Notify a tunnel that a connection has broken that affects at least
952 * @param t Tunnel affected.
953 * @param p1 Peer that got disconnected from p2.
954 * @param p2 Peer that got disconnected from p1.
956 * @return Short ID of the peer disconnected (either p1 or p2).
957 * 0 if the tunnel remained unaffected.
959 static GNUNET_PEER_Id
960 tunnel_notify_connection_broken (struct MeshTunnel2 *t,
961 GNUNET_PEER_Id p1, GNUNET_PEER_Id p2);
964 * @brief Use the given path for the tunnel.
965 * Update the next and prev hops (and RCs).
966 * (Re)start the path refresh in case the tunnel is locally owned.
968 * @param t Tunnel to update.
969 * @param p Path to use.
971 * @return Connection created.
973 static struct MeshConnection *
974 tunnel_use_path (struct MeshTunnel2 *t, struct MeshPeerPath *p);
977 * Tunnel is empty: destroy it.
979 * Notifies all participants (peers, cleints) about the destruction.
981 * @param t Tunnel to destroy.
984 tunnel_destroy_empty (struct MeshTunnel2 *t);
987 * Destroy the tunnel.
989 * This function does not generate any warning traffic to clients or peers.
992 * Cancel messages belonging to this tunnel queued to neighbors.
993 * Free any allocated resources linked to the tunnel.
995 * @param t The tunnel to destroy.
998 tunnel_destroy (struct MeshTunnel2 *t);
1001 * Send FWD keepalive packets for a connection.
1003 * @param cls Closure (connection for which to send the keepalive).
1004 * @param tc Notification context.
1007 connection_fwd_keepalive (void *cls,
1008 const struct GNUNET_SCHEDULER_TaskContext *tc);
1011 * Send BCK keepalive packets for a connection.
1013 * @param cls Closure (connection for which to send the keepalive).
1014 * @param tc Notification context.
1017 connection_bck_keepalive (void *cls,
1018 const struct GNUNET_SCHEDULER_TaskContext *tc);
1022 * Change the tunnel state.
1024 * @param c Connection whose state to change.
1025 * @param state New state.
1028 connection_change_state (struct MeshConnection* c,
1029 enum MeshConnectionState state);
1034 * @brief Queue and pass message to core when possible.
1036 * @param cls Closure (@c type dependant). It will be used by queue_send to
1037 * build the message to be sent if not already prebuilt.
1038 * @param type Type of the message, 0 for a raw message.
1039 * @param size Size of the message.
1040 * @param dst Neighbor to send message to.
1041 * @param c Connection this message belongs to, if any.
1042 * @param ch Channel this message belongs to, if applicable (otherwise NULL).
1045 queue_add (void *cls, uint16_t type, size_t size,
1046 struct MeshPeer *dst,
1047 struct MeshConnection *c,
1048 struct MeshChannel *ch);
1052 * Free a transmission that was already queued with all resources
1053 * associated to the request.
1055 * @param queue Queue handler to cancel.
1056 * @param clear_cls Is it necessary to free associated cls?
1059 queue_destroy (struct MeshPeerQueue *queue, int clear_cls);
1063 * @brief Get the next transmittable message from the queue.
1065 * This will be the head, except in the case of being a data packet
1066 * not allowed by the destination peer.
1068 * @param peer Destination peer.
1070 * @return The next viable MeshPeerQueue element to send to that peer.
1071 * NULL when there are no transmittable messages.
1073 struct MeshPeerQueue *
1074 queue_get_next (const struct MeshPeer *peer);
1078 * Core callback to write a queued packet to core buffer
1080 * @param cls Closure (peer info).
1081 * @param size Number of bytes available in buf.
1082 * @param buf Where the to write the message.
1084 * @return number of bytes written to buf
1087 queue_send (void *cls, size_t size, void *buf);
1091 * Dummy function to separate declarations from definitions in function list.
1094 __mesh_divider______________________________________________________________();
1098 * Get string description for tunnel state.
1100 * @param s Tunnel state.
1102 * @return String representation.
1105 GNUNET_MESH_DEBUG_TS2S (enum MeshTunnelState s)
1107 static char buf[128];
1111 case MESH_TUNNEL_NEW:
1112 return "MESH_TUNNEL_NEW";
1113 case MESH_TUNNEL_SEARCHING:
1114 return "MESH_TUNNEL_SEARCHING";
1115 case MESH_TUNNEL_WAITING:
1116 return "MESH_TUNNEL_WAITING";
1117 case MESH_TUNNEL_READY:
1118 return "MESH_TUNNEL_READY";
1119 case MESH_TUNNEL_RECONNECTING:
1120 return "MESH_TUNNEL_RECONNECTING";
1123 sprintf (buf, "%u (UNKNOWN STATE)", s);
1130 * Get string description for tunnel state.
1132 * @param s Tunnel state.
1134 * @return String representation.
1137 GNUNET_MESH_DEBUG_CS2S (enum MeshTunnelState s)
1141 case MESH_CONNECTION_NEW:
1142 return "MESH_CONNECTION_NEW";
1143 case MESH_CONNECTION_SENT:
1144 return "MESH_CONNECTION_SENT";
1145 case MESH_CONNECTION_READY:
1146 return "MESH_CONNECTION_READY";
1148 return "MESH_CONNECTION_STATE_ERROR";
1154 /******************************************************************************/
1155 /************************ PERIODIC FUNCTIONS ****************************/
1156 /******************************************************************************/
1159 * Periodically announce self id in the DHT
1161 * @param cls closure
1162 * @param tc task context
1165 announce_id (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1167 struct PBlock block;
1169 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1171 announce_id_task = GNUNET_SCHEDULER_NO_TASK;
1175 * - Set data expiration in function of X
1176 * - Adapt X to churn
1178 DEBUG_DHT ("DHT_put for ID %s started.\n", GNUNET_i2s (&my_full_id));
1180 block.id = my_full_id;
1181 GNUNET_DHT_put (dht_handle, /* DHT handle */
1182 &my_full_id.hashPubKey, /* Key to use */
1183 dht_replication_level, /* Replication level */
1184 GNUNET_DHT_RO_RECORD_ROUTE | GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE, /* DHT options */
1185 GNUNET_BLOCK_TYPE_MESH_PEER, /* Block type */
1186 sizeof (block), /* Size of the data */
1187 (const char *) &block, /* Data itself */
1188 GNUNET_TIME_UNIT_FOREVER_ABS, /* Data expiration */
1189 GNUNET_TIME_UNIT_FOREVER_REL, /* Retry time */
1190 NULL, /* Continuation */
1191 NULL); /* Continuation closure */
1193 GNUNET_SCHEDULER_add_delayed (id_announce_time, &announce_id, cls);
1197 /******************************************************************************/
1198 /****************** GENERAL HELPER FUNCTIONS ************************/
1199 /******************************************************************************/
1203 * Get the previous hop in a connection
1205 * @param c Connection.
1207 * @return Previous peer in the connection.
1209 static struct MeshPeer *
1210 connection_get_prev_hop (struct MeshConnection *c)
1214 if (0 == c->own_pos || c->path->length < 2)
1215 id = c->path->peers[0];
1217 id = c->path->peers[c->own_pos - 1];
1219 return peer_get_short (id);
1224 * Get the next hop in a connection
1226 * @param c Connection.
1228 * @return Next peer in the connection.
1230 static struct MeshPeer *
1231 connection_get_next_hop (struct MeshConnection *c)
1235 if ((c->path->length - 1) == c->own_pos || c->path->length < 2)
1236 id = c->path->peers[c->path->length - 1];
1238 id = c->path->peers[c->own_pos + 1];
1240 return peer_get_short (id);
1245 * Check if client has registered with the service and has not disconnected
1247 * @param client the client to check
1249 * @return non-NULL if client exists in the global DLL
1251 static struct MeshClient *
1252 client_get (struct GNUNET_SERVER_Client *client)
1254 return GNUNET_SERVER_client_get_user_context (client, struct MeshClient);
1259 * Deletes a tunnel from a client (either owner or destination). To be used on
1262 * @param c Client whose tunnel to delete.
1263 * @param ch Channel which should be deleted.
1266 client_delete_channel (struct MeshClient *c, struct MeshChannel *ch)
1272 res = GNUNET_CONTAINER_multihashmap32_remove (c->own_channels,
1274 if (GNUNET_YES != res)
1275 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "client_delete_channel owner KO\n");
1277 if (c == ch->client)
1279 res = GNUNET_CONTAINER_multihashmap32_remove (c->incoming_channels,
1281 if (GNUNET_YES != res)
1282 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "client_delete_tunnel client KO\n");
1288 * Notify the appropriate client that a new incoming channel was created.
1290 * @param ch Channel that was created.
1293 send_local_channel_create (struct MeshChannel *ch)
1295 struct GNUNET_MESH_ChannelMessage msg;
1296 struct MeshTunnel2 *t = ch->t;
1298 if (NULL == ch->client)
1300 msg.header.size = htons (sizeof (msg));
1301 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE);
1302 msg.channel_id = htonl (ch->id_dest);
1303 msg.port = htonl (ch->port);
1305 msg.opt |= GNUNET_YES == ch->reliable ? GNUNET_MESH_OPTION_RELIABLE : 0;
1306 msg.opt |= GNUNET_YES == ch->nobuffer ? GNUNET_MESH_OPTION_NOBUFFER : 0;
1307 msg.opt = htonl (msg.opt);
1308 GNUNET_PEER_resolve (t->peer->id, &msg.peer);
1309 GNUNET_SERVER_notification_context_unicast (nc, ch->client->handle,
1310 &msg.header, GNUNET_NO);
1315 * Notify a client that the incoming tunnel is no longer valid.
1317 * @param ch Channel that is destroyed.
1318 * @param fwd Forward notification (owner->dest)?
1321 send_local_channel_destroy (struct MeshChannel *ch, int fwd)
1323 struct GNUNET_MESH_ChannelMessage msg;
1324 struct MeshClient *c;
1326 c = fwd ? ch->client : ch->owner;
1332 msg.header.size = htons (sizeof (msg));
1333 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY);
1334 msg.channel_id = htonl (fwd ? ch->id_dest : ch->id);
1335 msg.port = htonl (0);
1336 memset (&msg.peer, 0, sizeof (msg.peer));
1337 msg.opt = htonl (0);
1338 GNUNET_SERVER_notification_context_unicast (nc, c->handle,
1339 &msg.header, GNUNET_NO);
1344 * Build a local ACK message and send it to a local client.
1346 * @param ch Channel on which to send the ACK.
1347 * @param c Client to whom send the ACK.
1348 * @param is_fwd Set to GNUNET_YES for FWD ACK (dest->owner)
1351 send_local_ack (struct MeshChannel *ch,
1352 struct MeshClient *c,
1355 struct GNUNET_MESH_LocalAck msg;
1357 msg.header.size = htons (sizeof (msg));
1358 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK);
1359 msg.channel_id = htonl (is_fwd ? ch->id : ch->id_dest);
1360 GNUNET_SERVER_notification_context_unicast (nc,
1368 * Count established (ready) connections of a tunnel.
1370 * @param t Tunnel on which to send the message.
1372 * @return Number of connections.
1375 tunnel_count_connections (struct MeshTunnel2 *t)
1377 struct MeshConnection *c;
1380 for (c = t->connection_head, i = 0; NULL != c; c = c->next, i++);
1387 * Pick a connection on which send the next data message.
1389 * @param t Tunnel on which to send the message.
1390 * @param fwd Is this a fwd message?
1392 * @return The connection on which to send the next message.
1394 static struct MeshConnection *
1395 tunnel_get_connection (struct MeshTunnel2 *t, int fwd)
1397 struct MeshConnection *c;
1398 struct MeshConnection *best;
1399 struct MeshPeer *peer;
1400 unsigned int lowest_q;
1405 lowest_q = UINT_MAX;
1406 for (c = t->connection_head; NULL != c; c = c->next)
1408 if (MESH_CONNECTION_READY == c->state)
1410 peer = fwd ? connection_get_next_hop (c) : connection_get_prev_hop (c);
1411 if (NULL == peer->fc)
1416 if (peer->fc->queue_n < lowest_q)
1419 lowest_q = peer->fc->queue_n;
1428 * FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME
1429 * Encrypt data with the tunnel key.
1431 * @param t Tunnel whose key to use.
1432 * @param dst Destination for the encrypted data.
1433 * @param src Source of the plaintext.
1434 * @param size Size of the plaintext.
1435 * @param iv Initialization Vector to use.
1436 * @param fwd Is this a fwd message?
1439 tunnel_encrypt (struct MeshTunnel2 *t,
1440 void *dst, const void *src,
1441 size_t size, uint64_t iv, int fwd)
1443 memcpy (dst, src, size);
1448 * FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME
1449 * Decrypt data with the tunnel key.
1451 * @param t Tunnel whose key to use.
1452 * @param dst Destination for the plaintext.
1453 * @param src Source of the encrypted data.
1454 * @param size Size of the encrypted data.
1455 * @param iv Initialization Vector to use.
1456 * @param fwd Is this a fwd message?
1459 tunnel_decrypt (struct MeshTunnel2 *t,
1460 void *dst, const void *src,
1461 size_t size, uint64_t iv, int fwd)
1463 memcpy (dst, src, size);
1468 * Sends an already built message on a connection, properly registering
1469 * all used resources.
1471 * @param message Message to send. Function makes a copy of it.
1472 * If message is not hop-by-hop, decrements TTL of copy.
1473 * @param c Connection on which this message is transmitted.
1474 * @param ch Channel on which this message is transmitted, or NULL.
1475 * @param fwd Is this a fwd message?
1478 send_prebuilt_message_connection (const struct GNUNET_MessageHeader *message,
1479 struct MeshConnection *c,
1480 struct MeshChannel *ch,
1483 struct MeshPeer *neighbor;
1488 neighbor = fwd ? connection_get_next_hop (c) : connection_get_prev_hop (c);
1489 if (NULL == neighbor)
1495 size = ntohs (message->size);
1496 data = GNUNET_malloc (size);
1497 memcpy (data, message, size);
1498 type = ntohs(message->type);
1500 if (GNUNET_MESSAGE_TYPE_MESH_FWD == type ||
1501 GNUNET_MESSAGE_TYPE_MESH_BCK == type)
1503 struct GNUNET_MESH_Encrypted *msg;
1506 msg = (struct GNUNET_MESH_Encrypted *) data;
1507 ttl = ntohl (msg->ttl);
1510 GNUNET_break_op (0);
1513 msg->ttl = htonl (ttl - 1);
1526 * Sends an already built message on a tunnel, choosing the best connection.
1528 * @param message Message to send. Function modifies it.
1529 * @param t Tunnel on which this message is transmitted.
1530 * @param ch Channel on which this message is transmitted.
1531 * @param fwd Is this a fwd message?
1534 send_prebuilt_message_tunnel (struct GNUNET_MESH_Encrypted *msg,
1535 struct MeshTunnel2 *t,
1536 struct MeshChannel *ch,
1539 struct MeshConnection *c;
1542 c = tunnel_get_connection (t, fwd);
1548 type = ntohs (msg->header.size);
1551 case GNUNET_MESSAGE_TYPE_MESH_FWD:
1552 case GNUNET_MESSAGE_TYPE_MESH_BCK:
1553 msg->cid = htonl (c->id);
1555 msg->ttl = default_ttl;
1561 send_prebuilt_message_connection (&msg->header, c, ch, fwd);
1566 * Sends an already built message on a channel, properly registering
1567 * all used resources and encrypting the message with the tunnel's key.
1569 * @param message Message to send. Function makes a copy of it.
1570 * @param ch Channel on which this message is transmitted.
1571 * @param fwd Is this a fwd message?
1574 send_prebuilt_message_channel (const struct GNUNET_MessageHeader *message,
1575 struct MeshChannel *ch,
1578 struct GNUNET_MESH_Encrypted *msg;
1579 size_t size = ntohs (message->size);
1580 char *cbuf[size + sizeof (struct GNUNET_MESH_Encrypted)];
1584 type = fwd ? GNUNET_MESSAGE_TYPE_MESH_FWD : GNUNET_MESSAGE_TYPE_MESH_BCK;
1585 iv = GNUNET_CRYPTO_random_u64 (GNUNET_CRYPTO_QUALITY_WEAK, UINT64_MAX);
1587 msg = (struct GNUNET_MESH_Encrypted *) cbuf;
1588 msg->header.type = htons (type);
1589 msg->header.size = htons (size);
1590 msg->iv = GNUNET_htonll (iv);
1591 tunnel_encrypt (ch->t, &msg[1], message, size, iv, fwd);
1593 send_prebuilt_message_tunnel (msg, ch->t, ch, fwd);
1598 * Sends an already built message directly to a peer.
1599 * Message does must not belong to a connection or channel.
1601 * @param message Message to send. Function makes a copy of it.
1602 * @param peer Tunnel on which this message is transmitted.
1605 send_prebuilt_message_peer (const struct GNUNET_MessageHeader *message,
1606 struct MeshPeer *peer)
1618 size = ntohs (message->size);
1619 data = GNUNET_malloc (size);
1620 memcpy (data, message, size);
1621 type = ntohs(message->type);
1633 * Sends a CREATE CONNECTION message for a path to a peer.
1634 * Changes the connection and tunnel states if necessary.
1636 * @param connection Connection to create.
1639 send_connection_create (struct MeshConnection *connection)
1641 struct MeshPeer *neighbor;
1642 struct MeshTunnel2 *t;
1645 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Send connection create\n");
1646 neighbor = connection_get_next_hop (connection);
1647 queue_add (connection,
1648 GNUNET_MESSAGE_TYPE_MESH_CONNECTION_CREATE,
1649 sizeof (struct GNUNET_MESH_ConnectionCreate) +
1650 (connection->path->length *
1651 sizeof (struct GNUNET_PeerIdentity)),
1655 if (MESH_TUNNEL_SEARCHING == t->state)
1656 tunnel_change_state (t, MESH_TUNNEL_WAITING);
1657 if (MESH_CONNECTION_NEW == connection->state)
1658 connection_change_state (connection, MESH_CONNECTION_SENT);
1663 * Sends a CONNECTION ACK message in reponse to a received CONNECTION_CREATE
1666 * @param connection Connection to confirm.
1669 send_connection_ack (struct MeshConnection *connection)
1671 struct MeshPeer *neighbor;
1672 struct MeshTunnel2 *t;
1675 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Send connection ack\n");
1676 neighbor = connection_get_prev_hop (connection);
1677 queue_add (connection,
1678 GNUNET_MESSAGE_TYPE_MESH_CONNECTION_ACK,
1679 sizeof (struct GNUNET_MESH_ConnectionACK),
1683 if (MESH_TUNNEL_NEW == t->state)
1684 tunnel_change_state (t, MESH_TUNNEL_WAITING);
1689 * Build an ACK message and queue it to send to the given peer.
1691 * @param peer Peer to whom send the ACK.
1692 * @param ack Value of the ACK.
1695 send_ack (struct MeshPeer *peer, uint32_t ack)
1697 struct GNUNET_MESH_ACK msg;
1699 msg.header.size = htons (sizeof (msg));
1700 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_ACK);
1701 msg.ack = htonl (ack);
1703 send_prebuilt_message_peer (&msg.header, peer);
1708 * Core callback to write a pre-constructed data packet to core buffer
1710 * @param cls Closure (MeshTransmissionDescriptor with data in "data" member).
1711 * @param size Number of bytes available in buf.
1712 * @param buf Where the to write the message.
1714 * @return number of bytes written to buf
1717 send_core_data_raw (void *cls, size_t size, void *buf)
1719 struct GNUNET_MessageHeader *msg = cls;
1722 GNUNET_assert (NULL != msg);
1723 total_size = ntohs (msg->size);
1725 if (total_size > size)
1730 memcpy (buf, msg, total_size);
1737 * Function to send a create path packet to a peer.
1739 * @param cls closure
1740 * @param size number of bytes available in buf
1741 * @param buf where the callee should write the message
1742 * @return number of bytes written to buf
1745 send_core_connection_create (void *cls, size_t size, void *buf)
1747 struct MeshConnection *c = cls;
1748 struct GNUNET_MESH_ConnectionCreate *msg;
1749 struct GNUNET_PeerIdentity *peer_ptr;
1750 struct MeshPeerPath *p = c->path;
1754 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Sending CONNECTION CREATE...\n");
1756 sizeof (struct GNUNET_MESH_ConnectionCreate) +
1757 p->length * sizeof (struct GNUNET_PeerIdentity);
1759 if (size < size_needed || NULL == buf)
1764 msg = (struct GNUNET_MESH_ConnectionCreate *) buf;
1765 msg->header.size = htons (size_needed);
1766 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CONNECTION_CREATE);
1767 msg->cid = htonl (c->id);
1769 peer_ptr = (struct GNUNET_PeerIdentity *) &msg[1];
1770 for (i = 0; i < p->length; i++)
1772 GNUNET_PEER_resolve (p->peers[i], peer_ptr++);
1775 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1776 "CONNECTION CREATE (%u bytes long) sent!\n", size_needed);
1782 * Creates a path ack message in buf and frees all unused resources.
1784 * @param cls closure (MeshTransmissionDescriptor)
1785 * @param size number of bytes available in buf
1786 * @param buf where the callee should write the message
1787 * @return number of bytes written to buf
1790 send_core_connection_ack (void *cls, size_t size, void *buf)
1792 struct GNUNET_MESH_ConnectionACK *msg = buf;
1793 struct MeshConnection *c = cls;
1794 struct MeshTunnel2 *t = c->t;
1796 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Sending CONNECTION ACK...\n");
1797 GNUNET_assert (NULL != t);
1798 if (sizeof (struct GNUNET_MESH_ConnectionACK) > size)
1803 msg->header.size = htons (sizeof (struct GNUNET_MESH_ConnectionACK));
1804 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CONNECTION_ACK);
1805 GNUNET_CRYPTO_hash_xor (&GNUNET_PEER_resolve2 (t->peer->id)->hashPubKey,
1806 &my_full_id.hashPubKey,
1808 msg->cid = htonl (c->id);
1810 /* TODO add signature */
1812 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "CONNECTION ACK sent!\n");
1813 return sizeof (struct GNUNET_MESH_ConnectionACK);
1818 * Iterator over all the peers to remove the oldest not-used entry.
1820 * @param cls Closure (unsued).
1821 * @param key ID of the peer.
1822 * @param value Peer_Info of the peer.
1827 peer_timeout (void *cls,
1828 const struct GNUNET_HashCode *key,
1836 * Retrieve the MeshPeer stucture associated with the peer, create one
1837 * and insert it in the appropriate structures if the peer is not known yet.
1839 * @param peer Full identity of the peer.
1841 * @return Existing or newly created peer info.
1843 static struct MeshPeer *
1844 peer_get (const struct GNUNET_PeerIdentity *peer_id)
1846 struct MeshPeer *peer;
1848 peer = GNUNET_CONTAINER_multihashmap_get (peers, &peer_id->hashPubKey);
1851 peer = GNUNET_new (struct MeshPeer);
1852 if (GNUNET_CONTAINER_multihashmap_size (peers) > max_peers)
1854 GNUNET_CONTAINER_multihashmap_iterate (peers,
1858 GNUNET_CONTAINER_multihashmap_put (peers, &peer_id->hashPubKey, peer,
1859 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST);
1860 peer->id = GNUNET_PEER_intern (peer_id);
1862 peer->last_contact = GNUNET_TIME_absolute_get();
1869 * Retrieve the MeshPeer stucture associated with the peer, create one
1870 * and insert it in the appropriate structures if the peer is not known yet.
1872 * @param peer Short identity of the peer.
1874 * @return Existing or newly created peer info.
1876 static struct MeshPeer *
1877 peer_get_short (const GNUNET_PEER_Id peer)
1879 return peer_get (GNUNET_PEER_resolve2 (peer));
1884 * Get a cost of a path for a peer considering existing tunnel connections.
1886 * @param peer Peer towards which the path is considered.
1887 * @param path Candidate path.
1889 * @return Cost of the path (path length + number of overlapping nodes)
1892 peer_get_path_cost (const struct MeshPeer *peer,
1893 const struct MeshPeerPath *path)
1895 struct MeshConnection *c;
1896 unsigned int overlap;
1904 GNUNET_assert (NULL != peer->tunnel);
1906 for (i = 0; i < path->length; i++)
1908 for (c = peer->tunnel->connection_head; NULL != c; c = c->next)
1910 for (j = 0; j < c->path->length; j++)
1912 if (path->peers[i] == c->path->peers[j])
1920 return (path->length + overlap) * (path->score * -1);
1925 * Choose the best path towards a peer considering the tunnel properties.
1927 * @param peer The destination peer.
1929 * @return Best current known path towards the peer, if any.
1931 static struct MeshPeerPath *
1932 peer_get_best_path (const struct MeshPeer *peer)
1934 struct MeshPeerPath *best_p;
1935 struct MeshPeerPath *p;
1936 struct MeshConnection *c;
1937 unsigned int best_cost;
1940 best_cost = UINT_MAX;
1942 for (p = peer->path_head; NULL != p; p = p->next)
1944 for (c = peer->tunnel->connection_head; NULL != c; c = c->next)
1948 continue; /* If path is in use in a connection, skip it. */
1950 if ((cost = peer_get_path_cost (peer, p)) < best_cost)
1961 * Try to establish a new connection to this peer in the given tunnel.
1962 * If the peer doesn't have any path to it yet, try to get one.
1963 * If the peer already has some path, send a CREATE CONNECTION towards it.
1965 * @param peer PeerInfo of the peer.
1968 peer_connect (struct MeshPeer *peer)
1970 struct MeshTunnel2 *t;
1971 struct MeshPeerPath *p;
1972 struct MeshConnection *c;
1975 if (NULL != peer->path_head)
1977 p = peer_get_best_path (peer);
1980 c = tunnel_use_path (t, p);
1981 send_connection_create (c);
1984 else if (NULL == peer->dhtget)
1986 const struct GNUNET_PeerIdentity *id;
1988 id = GNUNET_PEER_resolve2 (peer->id);
1989 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1990 " Starting DHT GET for peer %s\n", GNUNET_i2s (id));
1991 peer->dhtget = GNUNET_DHT_get_start (dht_handle, /* handle */
1992 GNUNET_BLOCK_TYPE_MESH_PEER, /* type */
1993 &id->hashPubKey, /* key to search */
1994 dht_replication_level, /* replication level */
1995 GNUNET_DHT_RO_RECORD_ROUTE |
1996 GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE,
1998 0, /* xquery bits */
1999 &dht_get_id_handler, peer);
2000 if (MESH_TUNNEL_NEW == t->state)
2001 tunnel_change_state (t, MESH_TUNNEL_SEARCHING);
2005 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2006 "There is no path but the DHT GET is already started.\n");
2012 * @brief Re-initiate traffic to this peer if necessary.
2014 * Check if there is traffic queued towards this peer
2015 * and the core transmit handle is NULL (traffic was stalled).
2016 * If so, call core tmt rdy.
2018 * @param peer_id Short ID of peer to which initiate traffic.
2021 peer_unlock_queue (GNUNET_PEER_Id peer_id)
2023 struct MeshPeer *peer;
2024 struct MeshPeerQueue *q;
2027 peer = peer_get_short (peer_id);
2028 if (NULL != peer->fc->core_transmit)
2029 return; /* Already unlocked */
2031 q = queue_get_next (peer);
2033 return; /* Nothing to transmit */
2036 peer->fc->core_transmit =
2037 GNUNET_CORE_notify_transmit_ready (core_handle,
2040 GNUNET_TIME_UNIT_FOREVER_REL,
2041 GNUNET_PEER_resolve2 (peer->id),
2049 * Cancel all transmissions towards a neighbor that belong to
2050 * a certain connection.
2052 * @param peer Neighbor to whom cancel the transmissions.
2053 * @param c Connection which to cancel.
2056 peer_cancel_queues (struct MeshPeer *peer, struct MeshConnection *c)
2058 struct MeshPeerQueue *q;
2059 struct MeshPeerQueue *next;
2060 struct MeshFlowControl *fc;
2062 if (NULL == peer || NULL == peer->fc)
2068 for (q = fc->queue_head; NULL != q; q = next)
2073 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2074 "peer_cancel_queue %s\n",
2075 GNUNET_MESH_DEBUG_M2S (q->type));
2076 queue_destroy (q, GNUNET_YES);
2079 if (NULL == fc->queue_head)
2081 if (NULL != fc->core_transmit)
2083 GNUNET_CORE_notify_transmit_ready_cancel (fc->core_transmit);
2084 fc->core_transmit = NULL;
2086 if (GNUNET_SCHEDULER_NO_TASK != fc->poll_task)
2088 GNUNET_SCHEDULER_cancel (fc->poll_task);
2089 fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
2096 * Destroy the peer_info and free any allocated resources linked to it
2098 * @param peer The peer_info to destroy.
2100 * @return GNUNET_OK on success
2103 peer_destroy (struct MeshPeer *peer)
2105 struct GNUNET_PeerIdentity id;
2106 struct MeshPeerPath *p;
2107 struct MeshPeerPath *nextp;
2109 GNUNET_PEER_resolve (peer->id, &id);
2110 GNUNET_PEER_change_rc (peer->id, -1);
2113 GNUNET_CONTAINER_multihashmap_remove (peers, &id.hashPubKey, peer))
2116 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2117 "removing peer %s, not in hashmap\n", GNUNET_i2s (&id));
2119 if (NULL != peer->dhtget)
2121 GNUNET_DHT_get_stop (peer->dhtget);
2123 p = peer->path_head;
2127 GNUNET_CONTAINER_DLL_remove (peer->path_head, peer->path_tail, p);
2131 tunnel_destroy_empty (peer->tunnel);
2138 * Remove all paths that rely on a direct connection between p1 and p2
2139 * from the peer itself and notify all tunnels about it.
2141 * @param peer PeerInfo of affected peer.
2142 * @param p1 GNUNET_PEER_Id of one peer.
2143 * @param p2 GNUNET_PEER_Id of another peer that was connected to the first and
2146 * TODO: optimize (see below)
2149 peer_remove_path (struct MeshPeer *peer, GNUNET_PEER_Id p1,
2152 struct MeshPeerPath *p;
2153 struct MeshPeerPath *next;
2154 struct MeshPeer *peer_d;
2156 unsigned int destroyed;
2159 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "peer_info_remove_path\n");
2161 for (p = peer->path_head; NULL != p; p = next)
2164 for (i = 0; i < (p->length - 1); i++)
2166 if ((p->peers[i] == p1 && p->peers[i + 1] == p2) ||
2167 (p->peers[i] == p2 && p->peers[i + 1] == p1))
2169 GNUNET_CONTAINER_DLL_remove (peer->path_head, peer->path_tail, p);
2180 d = tunnel_notify_connection_broken (peer->tunnel, p1, p2);
2182 peer_d = peer_get_short (d); // FIXME
2183 next = peer_get_best_path (peer_d);
2184 tunnel_use_path (peer->tunnel, next);
2185 peer_connect (peer_d);
2187 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "peer_info_remove_path END\n");
2192 * Add the path to the peer and update the path used to reach it in case this
2195 * @param peer_info Destination peer to add the path to.
2196 * @param path New path to add. Last peer must be the peer in arg 1.
2197 * Path will be either used of freed if already known.
2198 * @param trusted Do we trust that this path is real?
2201 peer_add_path (struct MeshPeer *peer_info, struct MeshPeerPath *path,
2204 struct MeshPeerPath *aux;
2208 if ((NULL == peer_info) || (NULL == path))
2211 path_destroy (path);
2214 if (path->peers[path->length - 1] != peer_info->id)
2217 path_destroy (path);
2220 if (2 >= path->length && GNUNET_NO == trusted)
2222 /* Only allow CORE to tell us about direct paths */
2223 path_destroy (path);
2226 for (l = 1; l < path->length; l++)
2228 if (path->peers[l] == myid)
2230 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "shortening path by %u\n", l);
2231 for (l2 = 0; l2 < path->length - l; l2++)
2233 path->peers[l2] = path->peers[l + l2];
2238 GNUNET_realloc (path->peers, path->length * sizeof (GNUNET_PEER_Id));
2243 struct GNUNET_PeerIdentity id;
2245 GNUNET_PEER_resolve (peer_info->id, &id);
2246 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "adding path [%u] to peer %s\n",
2247 path->length, GNUNET_i2s (&id));
2250 l = path_get_length (path);
2253 path_destroy (path);
2257 GNUNET_assert (peer_info->id == path->peers[path->length - 1]);
2258 for (aux = peer_info->path_head; aux != NULL; aux = aux->next)
2260 l2 = path_get_length (aux);
2263 GNUNET_CONTAINER_DLL_insert_before (peer_info->path_head,
2264 peer_info->path_tail, aux, path);
2269 if (l2 == l && memcmp (path->peers, aux->peers, l) == 0)
2271 path_destroy (path);
2276 GNUNET_CONTAINER_DLL_insert_tail (peer_info->path_head, peer_info->path_tail,
2283 * Add the path to the origin peer and update the path used to reach it in case
2284 * this is the shortest.
2285 * The path is given in peer_info -> destination, therefore we turn the path
2286 * upside down first.
2288 * @param peer_info Peer to add the path to, being the origin of the path.
2289 * @param path New path to add after being inversed.
2290 * Path will be either used or freed.
2291 * @param trusted Do we trust that this path is real?
2294 peer_add_path_to_origin (struct MeshPeer *peer_info,
2295 struct MeshPeerPath *path, int trusted)
2298 peer_add_path (peer_info, path, trusted);
2304 * Function called if the connection to the peer has been stalled for a while,
2305 * possibly due to a missed ACK. Poll the peer about its ACK status.
2307 * @param cls Closure (poll ctx).
2308 * @param tc TaskContext.
2311 peer_poll (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
2313 struct MeshFlowControl *fc = cls;
2314 struct GNUNET_MESH_Poll msg;
2315 struct MeshPeer *peer;
2317 fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
2318 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
2323 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " *** Polling!\n");
2326 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " *** peer: %s!\n",
2327 GNUNET_i2s (GNUNET_PEER_resolve2 (peer->id)));
2329 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_POLL);
2330 msg.header.size = htons (sizeof (msg));
2331 msg.pid = htonl (fc->last_pid_sent);
2332 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " *** pid (%u)!\n", fc->last_pid_sent);
2333 send_prebuilt_message_peer (&msg.header, peer);
2334 fc->poll_time = GNUNET_TIME_STD_BACKOFF (fc->poll_time);
2335 fc->poll_task = GNUNET_SCHEDULER_add_delayed (fc->poll_time,
2341 * Build a PeerPath from the paths returned from the DHT, reversing the paths
2342 * to obtain a local peer -> destination path and interning the peer ids.
2344 * @return Newly allocated and created path
2346 static struct MeshPeerPath *
2347 path_build_from_dht (const struct GNUNET_PeerIdentity *get_path,
2348 unsigned int get_path_length,
2349 const struct GNUNET_PeerIdentity *put_path,
2350 unsigned int put_path_length)
2352 struct MeshPeerPath *p;
2358 GNUNET_PEER_change_rc (myid, 1);
2359 i = get_path_length;
2360 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " GET has %d hops.\n", i);
2361 for (i--; i >= 0; i--)
2363 id = GNUNET_PEER_intern (&get_path[i]);
2364 if (p->length > 0 && id == p->peers[p->length - 1])
2366 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Optimizing 1 hop out.\n");
2367 GNUNET_PEER_change_rc (id, -1);
2371 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Adding from GET: %s.\n",
2372 GNUNET_i2s (&get_path[i]));
2374 p->peers = GNUNET_realloc (p->peers, sizeof (GNUNET_PEER_Id) * p->length);
2375 p->peers[p->length - 1] = id;
2378 i = put_path_length;
2379 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " PUT has %d hops.\n", i);
2380 for (i--; i >= 0; i--)
2382 id = GNUNET_PEER_intern (&put_path[i]);
2385 /* PUT path went through us, so discard the path up until now and start
2386 * from here to get a much shorter (and loop-free) path.
2391 if (p->length > 0 && id == p->peers[p->length - 1])
2393 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Optimizing 1 hop out.\n");
2394 GNUNET_PEER_change_rc (id, -1);
2398 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Adding from PUT: %s.\n",
2399 GNUNET_i2s (&put_path[i]));
2401 p->peers = GNUNET_realloc (p->peers, sizeof (GNUNET_PEER_Id) * p->length);
2402 p->peers[p->length - 1] = id;
2406 if (get_path_length > 0)
2407 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " (first of GET: %s)\n",
2408 GNUNET_i2s (&get_path[0]));
2409 if (put_path_length > 0)
2410 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " (first of PUT: %s)\n",
2411 GNUNET_i2s (&put_path[0]));
2412 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " In total: %d hops\n",
2414 for (i = 0; i < p->length; i++)
2416 struct GNUNET_PeerIdentity peer_id;
2418 GNUNET_PEER_resolve (p->peers[i], &peer_id);
2419 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " %u: %s\n", p->peers[i],
2420 GNUNET_i2s (&peer_id));
2428 * Adds a path to the peer_infos of all the peers in the path
2430 * @param p Path to process.
2431 * @param confirmed Whether we know if the path works or not.
2434 path_add_to_peers (struct MeshPeerPath *p, int confirmed)
2438 /* TODO: invert and add */
2439 for (i = 0; i < p->length && p->peers[i] != myid; i++) /* skip'em */ ;
2440 for (i++; i < p->length; i++)
2442 struct MeshPeer *aux;
2443 struct MeshPeerPath *copy;
2445 aux = peer_get_short (p->peers[i]);
2446 copy = path_duplicate (p);
2447 copy->length = i + 1;
2448 peer_add_path (aux, copy, p->length < 3 ? GNUNET_NO : confirmed);
2454 * Search for a channel among the channels for a client
2456 * @param c the client whose channels to search in
2457 * @param chid the local id of the channel
2459 * @return channel handler, NULL if doesn't exist
2461 static struct MeshChannel *
2462 channel_get_by_local_id (struct MeshClient *c, MESH_ChannelNumber chid)
2464 if (0 == (chid & GNUNET_MESH_LOCAL_CHANNEL_ID_CLI))
2466 GNUNET_break_op (0);
2467 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "CHID %X not a local chid\n", chid);
2470 if (chid >= GNUNET_MESH_LOCAL_CHANNEL_ID_SERV)
2471 return GNUNET_CONTAINER_multihashmap32_get (c->incoming_channels, chid);
2472 return GNUNET_CONTAINER_multihashmap32_get (c->own_channels, chid);
2476 * Search for a tunnel by global ID using full PeerIdentities.
2478 * @param t Tunnel containing the channel.
2479 * @param chid Public channel number.
2481 * @return channel handler, NULL if doesn't exist
2483 static struct MeshChannel *
2484 channel_get (struct MeshTunnel2 *t, MESH_ChannelNumber chid)
2486 struct MeshChannel *ch;
2491 for (ch = t->channel_head; NULL != ch; ch = ch->next)
2502 * Change the tunnel state.
2504 * @param t Tunnel whose state to change.
2505 * @param state New state.
2508 tunnel_change_state (struct MeshTunnel2* t, enum MeshTunnelState state)
2510 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2511 "Tunnel %s state was %s\n",
2512 GNUNET_i2s (GNUNET_PEER_resolve2 (t->peer->id)),
2513 GNUNET_MESH_DEBUG_TS2S (t->state));
2514 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2515 "Tunnel %s state is now %s\n",
2516 GNUNET_i2s (GNUNET_PEER_resolve2 (t->peer->id)),
2517 GNUNET_MESH_DEBUG_TS2S (state));
2523 connection_change_state (struct MeshConnection* c,
2524 enum MeshConnectionState state)
2526 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2527 "Connection %s[%X] state was %s\n",
2528 GNUNET_i2s (GNUNET_PEER_resolve2 (c->t->peer->id)), c->id,
2529 GNUNET_MESH_DEBUG_CS2S (c->state));
2530 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2531 "Connection %s[%X] state is now %s\n",
2532 GNUNET_i2s (GNUNET_PEER_resolve2 (c->t->peer->id)), c->id,
2533 GNUNET_MESH_DEBUG_CS2S (state));
2539 * Add a client to a channel, initializing all needed data structures.
2541 * @param ch Channel to which add the client.
2542 * @param c Client which to add to the channel.
2545 channel_add_client (struct MeshChannel *ch, struct MeshClient *c)
2547 if (NULL != ch->client)
2553 GNUNET_CONTAINER_multihashmap32_put (c->incoming_channels,
2555 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST))
2564 static struct MeshConnection *
2565 tunnel_use_path (struct MeshTunnel2 *t, struct MeshPeerPath *p)
2567 struct MeshConnection *c;
2568 unsigned int own_pos;
2570 c = GNUNET_new (struct MeshConnection);
2571 for (own_pos = 0; own_pos < p->length; own_pos++)
2573 if (p->peers[own_pos] == myid)
2576 if (own_pos > p->length - 1)
2581 c->own_pos = own_pos;
2583 c->id = t->next_cid++;
2585 GNUNET_CONTAINER_DLL_insert_tail (t->connection_head, t->connection_tail, c);
2589 c->fwd_maintenance_task =
2590 GNUNET_SCHEDULER_add_delayed (refresh_connection_time,
2591 &connection_fwd_keepalive, c);
2598 * Notifies a tunnel that a connection has broken that affects at least
2599 * some of its peers. Sends a notification towards the root of the tree.
2600 * In case the peer is the owner of the tree, notifies the client that owns
2601 * the tunnel and tries to reconnect.
2603 * FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME
2605 * @param t Tunnel affected.
2606 * @param p1 Peer that got disconnected from p2.
2607 * @param p2 Peer that got disconnected from p1.
2609 * @return Short ID of the peer disconnected (either p1 or p2).
2610 * 0 if the tunnel remained unaffected.
2612 static GNUNET_PEER_Id
2613 tunnel_notify_connection_broken (struct MeshTunnel2* t,
2614 GNUNET_PEER_Id p1, GNUNET_PEER_Id p2)
2616 // if (myid != p1 && myid != p2) FIXME
2621 // if (tree_get_predecessor (t->tree) != 0)
2623 // /* We are the peer still connected, notify owner of the disconnection. */
2624 // struct GNUNET_MESH_PathBroken msg;
2625 // struct GNUNET_PeerIdentity neighbor;
2627 // msg.header.size = htons (sizeof (msg));
2628 // msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_BROKEN);
2629 // GNUNET_PEER_resolve (t->id.oid, &msg.oid);
2630 // msg.tid = htonl (t->id.tid);
2631 // msg.peer1 = my_full_id;
2632 // GNUNET_PEER_resolve (pid, &msg.peer2);
2633 // GNUNET_PEER_resolve (tree_get_predecessor (t->tree), &neighbor);
2634 // send_prebuilt_message (&msg.header, &neighbor, t);
2641 * Send an end-to-end FWD ACK message for the most recent in-sequence payload.
2643 * @param ch Channel this is about.
2644 * @param fwd Is for FWD traffic? (ACK dest->owner)
2647 channel_send_data_ack (struct MeshChannel *ch, int fwd)
2649 struct GNUNET_MESH_DataACK msg;
2650 struct MeshChannelReliability *rel;
2651 struct MeshReliableMessage *copy;
2655 if (GNUNET_NO == ch->reliable)
2660 rel = fwd ? ch->bck_rel : ch->fwd_rel;
2661 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2662 "send_data_ack for %u\n",
2665 msg.header.type = htons (fwd ? GNUNET_MESSAGE_TYPE_MESH_UNICAST_ACK :
2666 GNUNET_MESSAGE_TYPE_MESH_TO_ORIG_ACK);
2667 msg.header.size = htons (sizeof (msg));
2668 msg.chid = htonl (ch->id);
2669 msg.mid = htonl (rel->mid_recv - 1);
2671 for (copy = rel->head_recv; NULL != copy; copy = copy->next)
2673 delta = copy->mid - rel->mid_recv;
2676 mask = 0x1LL << delta;
2677 msg.futures |= mask;
2678 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2679 " setting bit for %u (delta %u) (%llX) -> %llX\n",
2680 copy->mid, delta, mask, msg.futures);
2682 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " final futures %llX\n", msg.futures);
2684 send_prebuilt_message_channel (&msg.header, ch, fwd);
2685 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "send_data_ack END\n");
2690 * Send an ACK informing the predecessor about the available buffer space.
2692 * Note that although the name is fwd_ack, the FWD mean forward *traffic*,
2693 * the ACK itself goes "back" (towards root).
2695 * @param c Connection on which to send the ACK.
2696 * @param fwd Is this FWD ACK? (Going dest->owner)
2699 connection_send_ack (struct MeshConnection *c, int fwd)
2701 struct MeshFlowControl *next_fc;
2702 struct MeshFlowControl *prev_fc;
2703 struct MeshPeer *next;
2704 struct MeshPeer *prev;
2708 next = fwd ? connection_get_next_hop (c) : connection_get_prev_hop (c);
2709 prev = fwd ? connection_get_prev_hop (c) : connection_get_next_hop (c);
2713 /* Check if we need to transmit the ACK */
2714 if (prev_fc->last_ack_sent - prev_fc->last_pid_recv > 3)
2716 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Not sending ACK, buffer > 3\n");
2717 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2718 " last pid recv: %u, last ack sent: %u\n",
2719 prev_fc->last_pid_recv, prev_fc->last_ack_sent);
2723 /* Ok, ACK might be necessary, what PID to ACK? */
2724 delta = next_fc->queue_max - next_fc->queue_n;
2725 ack = prev_fc->last_pid_recv + delta;
2726 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ACK %u\n", ack);
2727 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2728 " last pid %u, last ack %u, qmax %u, q %u\n",
2729 prev_fc->last_pid_recv, prev_fc->last_ack_sent,
2730 next_fc->queue_max, next_fc->queue_n);
2731 if (ack == prev_fc->last_ack_sent)
2733 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Not sending FWD ACK, not needed\n");
2737 prev_fc->last_ack_sent = ack;
2738 send_ack (prev, ack);
2743 * Send an ACK informing the client about available buffer space.
2745 * Note that although the name is fwd_ack, the FWD mean forward *traffic*,
2746 * the ACK itself goes "back" (towards root).
2748 * @param ch Channel on which to send the ACK, NULL if unknown.
2749 * @param fwd Is this FWD ACK? (Going dest->owner)
2752 // channel_send_ack (struct MeshChannel *ch, uint16_t type, int fwd)
2754 // struct MeshChannelReliability *rel;
2755 // struct MeshFlowControl *next_fc;
2756 // struct MeshFlowControl *prev_fc;
2757 // struct MeshClient *c;
2758 // struct MeshClient *o;
2759 // GNUNET_PEER_Id hop;
2760 // uint32_t delta_mid;
2764 // rel = fwd ? ch->fwd_rel : ch->bck_rel;
2765 // c = fwd ? ch->client : ch->owner;
2766 // o = fwd ? ch->owner : ch->client;
2767 // hop = fwd ? connection_get_prev_hop (cn) : connection_get_next_hop (cn);
2768 // next_fc = fwd ? &t->next_fc : &t->prev_fc;
2769 // prev_fc = fwd ? &t->prev_fc : &t->next_fc;
2773 // case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
2774 // case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
2775 // GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2776 // "ACK due to %s\n",
2777 // GNUNET_MESH_DEBUG_M2S (type));
2778 // if (GNUNET_YES == t->nobuffer && (GNUNET_NO == t->reliable || NULL == c))
2780 // GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Not sending ACK, nobuffer\n");
2783 // if (GNUNET_YES == t->reliable && NULL != c)
2784 // tunnel_send_data_ack (t, fwd);
2786 // case GNUNET_MESSAGE_TYPE_MESH_UNICAST_ACK:
2787 // case GNUNET_MESSAGE_TYPE_MESH_TO_ORIG_ACK:
2788 // case GNUNET_MESSAGE_TYPE_MESH_ACK:
2789 // case GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK:
2791 // case GNUNET_MESSAGE_TYPE_MESH_POLL:
2792 // case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_ACK:
2793 // t->force_ack = GNUNET_YES;
2796 // GNUNET_break (0);
2799 // /* Check if we need to transmit the ACK */
2801 // prev_fc->last_ack_sent - prev_fc->last_pid_recv > 3 &&
2802 // GNUNET_NO == t->force_ack)
2804 // GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Not sending ACK, buffer free\n");
2805 // GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2806 // " last pid recv: %u, last ack sent: %u\n",
2807 // prev_fc->last_pid_recv, prev_fc->last_ack_sent);
2811 // /* Ok, ACK might be necessary, what PID to ACK? */
2812 // delta = t->queue_max - next_fc->queue_n;
2813 // if (NULL != o && GNUNET_YES == t->reliable && NULL != rel->head_sent)
2814 // delta_mid = rel->mid_sent - rel->head_sent->mid;
2817 // if (0 > delta || (GNUNET_YES == t->reliable &&
2819 // (10 < rel->n_sent || 64 <= delta_mid)))
2821 // if (NULL != o && delta > 1)
2823 // ack = prev_fc->last_pid_recv + delta;
2824 // GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ACK %u\n", ack);
2825 // GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2826 // " last pid %u, last ack %u, qmax %u, q %u\n",
2827 // prev_fc->last_pid_recv, prev_fc->last_ack_sent,
2828 // t->queue_max, next_fc->queue_n);
2829 // if (ack == prev_fc->last_ack_sent && GNUNET_NO == t->force_ack)
2831 // GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Not sending FWD ACK, not needed\n");
2835 // prev_fc->last_ack_sent = ack;
2837 // send_local_ack (t, o, fwd);
2838 // else if (0 != hop)
2839 // send_ack (t, hop, ack);
2841 // GNUNET_break (GNUNET_YES == t->destroy);
2842 // t->force_ack = GNUNET_NO;
2847 * Modify the mesh message TID from global to local and send to client.
2849 * @param ch Channel on which to send the message.
2850 * @param msg Message to modify and send.
2851 * @param c Client to send to.
2852 * @param tid Tunnel ID to use (c can be both owner and client).
2855 channel_send_client_to_tid (struct MeshChannel *ch,
2856 const struct GNUNET_MESH_Data *msg,
2857 struct MeshClient *c, MESH_ChannelNumber id)
2859 struct GNUNET_MESH_LocalData *copy;
2860 uint16_t size = ntohs (msg->header.size) - sizeof (struct GNUNET_MESH_Data);
2861 char cbuf[size + sizeof (struct GNUNET_MESH_LocalData)];
2863 if (size < sizeof (struct GNUNET_MessageHeader))
2865 GNUNET_break_op (0);
2873 copy = (struct GNUNET_MESH_LocalData *) cbuf;
2874 memcpy (©[1], &msg[1], size);
2875 copy->header.size = htons (sizeof (struct GNUNET_MESH_LocalData) + size);
2876 copy->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_DATA);
2877 copy->id = htonl (id);
2878 GNUNET_SERVER_notification_context_unicast (nc, c->handle,
2879 ©->header, GNUNET_NO);
2883 * Modify the data message ID from global to local and send to client.
2885 * @param ch Channel on which to send the message.
2886 * @param msg Message to modify and send.
2887 * @param fwd Forward?
2890 channel_send_client_data (struct MeshChannel *ch,
2891 const struct GNUNET_MESH_Data *msg,
2895 channel_send_client_to_tid (ch, msg, ch->client, ch->id_dest);
2897 channel_send_client_to_tid (ch, msg, ch->owner, ch->id);
2902 * Send up to 64 buffered messages to the client for in order delivery.
2904 * @param ch Channel on which to empty the message buffer.
2905 * @param c Client to send to.
2906 * @param rel Reliability structure to corresponding peer.
2907 * If rel == bck_rel, this is FWD data.
2910 channel_send_client_buffered_data (struct MeshChannel *ch,
2911 struct MeshClient *c,
2912 struct MeshChannelReliability *rel)
2914 struct MeshReliableMessage *copy;
2915 struct MeshReliableMessage *next;
2917 if (GNUNET_NO == ch->reliable)
2923 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "send_buffered_data\n");
2924 for (copy = rel->head_recv; NULL != copy; copy = next)
2927 if (copy->mid == rel->mid_recv)
2929 struct GNUNET_MESH_Data *msg = (struct GNUNET_MESH_Data *) ©[1];
2931 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2932 " have %u! now expecting %u\n",
2933 copy->mid, rel->mid_recv + 1);
2934 channel_send_client_data (ch, msg, (rel == ch->bck_rel));
2936 GNUNET_CONTAINER_DLL_remove (rel->head_recv, rel->tail_recv, copy);
2941 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2942 " don't have %u, next is %u\n",
2948 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "send_buffered_data END\n");
2953 * We have received a message out of order, buffer it until we receive
2954 * the missing one and we can feed the rest to the client.
2956 * @param msg Message to buffer.
2957 * @param rel Reliability data to the corresponding direction.
2960 channel_rel_add_buffered_data (const struct GNUNET_MESH_Data *msg,
2961 struct MeshChannelReliability *rel)
2963 struct MeshReliableMessage *copy;
2964 struct MeshReliableMessage *prev;
2968 size = ntohs (msg->header.size);
2969 mid = ntohl (msg->mid);
2970 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "add_buffered_data %u\n", mid);
2972 copy = GNUNET_malloc (sizeof (*copy) + size);
2975 memcpy (©[1], msg, size);
2977 // FIXME do something better than O(n), although n < 64...
2978 // FIXME start from the end (most messages are the latest ones)
2979 for (prev = rel->head_recv; NULL != prev; prev = prev->next)
2981 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " prev %u\n", prev->mid);
2982 if (GMC_is_pid_bigger (prev->mid, mid))
2984 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " bingo!\n");
2985 GNUNET_CONTAINER_DLL_insert_before (rel->head_recv, rel->tail_recv,
2990 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " insert at tail!\n");
2991 GNUNET_CONTAINER_DLL_insert_tail (rel->head_recv, rel->tail_recv, copy);
2992 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "add_buffered_data END\n");
2997 * Destroy a reliable message after it has been acknowledged, either by
2998 * direct mid ACK or bitfield. Updates the appropriate data structures and
2999 * timers and frees all memory.
3001 * @param copy Message that is no longer needed: remote peer got it.
3004 rel_message_free (struct MeshReliableMessage *copy)
3006 struct MeshChannelReliability *rel;
3007 struct GNUNET_TIME_Relative time;
3010 time = GNUNET_TIME_absolute_get_duration (copy->timestamp);
3011 rel->expected_delay.rel_value *= 7;
3012 rel->expected_delay.rel_value += time.rel_value;
3013 rel->expected_delay.rel_value /= 8;
3015 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! Freeing %u\n", copy->mid);
3016 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " n_sent %u\n", rel->n_sent);
3017 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! took %s\n",
3018 GNUNET_STRINGS_relative_time_to_string (time, GNUNET_NO));
3019 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! new expected delay %s\n",
3020 GNUNET_STRINGS_relative_time_to_string (rel->expected_delay,
3022 rel->retry_timer = rel->expected_delay;
3023 GNUNET_CONTAINER_DLL_remove (rel->head_sent, rel->tail_sent, copy);
3029 * Destroy all reliable messages queued for a channel,
3030 * during a channel destruction.
3031 * Frees the reliability structure itself.
3033 * @param rel Reliability data for a channel.
3036 channel_rel_free_all (struct MeshChannelReliability *rel)
3038 struct MeshReliableMessage *copy;
3039 struct MeshReliableMessage *next;
3044 for (copy = rel->head_recv; NULL != copy; copy = next)
3047 GNUNET_CONTAINER_DLL_remove (rel->head_recv, rel->tail_recv, copy);
3050 for (copy = rel->head_sent; NULL != copy; copy = next)
3053 GNUNET_CONTAINER_DLL_remove (rel->head_sent, rel->tail_sent, copy);
3056 if (GNUNET_SCHEDULER_NO_TASK != rel->retry_task)
3057 GNUNET_SCHEDULER_cancel (rel->retry_task);
3063 * Mark future messages as ACK'd.
3065 * @param rel Reliability data.
3066 * @param msg DataACK message with a bitfield of future ACK'd messages.
3069 channel_rel_free_sent (struct MeshChannelReliability *rel,
3070 const struct GNUNET_MESH_DataACK *msg)
3072 struct MeshReliableMessage *copy;
3073 struct MeshReliableMessage *next;
3080 bitfield = msg->futures;
3081 mid = ntohl (msg->mid);
3082 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3083 "free_sent_reliable %u %llX\n",
3085 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3086 " rel %p, head %p\n",
3087 rel, rel->head_sent);
3088 for (i = 0, copy = rel->head_sent;
3089 i < 64 && NULL != copy && 0 != bitfield;
3092 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3093 " trying bit %u (mid %u)\n",
3096 if (0 == (bitfield & mask))
3099 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " set!\n");
3100 /* Bit was set, clear the bit from the bitfield */
3103 /* The i-th bit was set. Do we have that copy? */
3104 /* Skip copies with mid < target */
3105 target = mid + i + 1;
3106 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " target %u\n", target);
3107 while (NULL != copy && GMC_is_pid_bigger (target, copy->mid))
3110 /* Did we run out of copies? (previously freed, it's ok) */
3113 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "run out of copies...\n");
3117 /* Did we overshoot the target? (previously freed, it's ok) */
3118 if (GMC_is_pid_bigger (copy->mid, target))
3120 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " next copy %u\n", copy->mid);
3124 /* Now copy->mid == target, free it */
3126 rel_message_free (copy);
3129 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "free_sent_reliable END\n");
3134 * We haven't received an ACK after a certain time: restransmit the message.
3136 * @param cls Closure (MeshReliableMessage with the message to restransmit)
3137 * @param tc TaskContext.
3140 channel_retransmit_message (void *cls,
3141 const struct GNUNET_SCHEDULER_TaskContext *tc)
3143 struct MeshChannelReliability *rel = cls;
3144 struct MeshReliableMessage *copy;
3145 struct MeshPeerQueue *q;
3146 struct MeshPeer *pi;
3147 struct MeshChannel *ch;
3148 struct MeshConnection *c;
3149 struct GNUNET_MESH_Data *payload;
3152 rel->retry_task = GNUNET_SCHEDULER_NO_TASK;
3153 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
3157 copy = rel->head_sent;
3164 /* Search the message to be retransmitted in the outgoing queue.
3165 * Check only the queue for the connection that is going to be used,
3166 * if the message is stuck in some other connection's queue we shouldn't
3168 * - cancelling it and sending the new one doesn't guarantee it's delivery,
3169 * the old connection could be temporary stalled or the queue happened to
3170 * be long at time of insertion.
3171 * - not sending the new one could cause terrible delays the old connection
3174 payload = (struct GNUNET_MESH_Data *) ©[1];
3175 fwd = (rel == ch->fwd_rel);
3176 c = tunnel_get_connection(ch->t, fwd);
3177 pi = connection_get_next_hop (c);
3178 for (q = pi->fc->queue_head; NULL != q; q = q->next)
3180 if (ntohs (payload->header.type) == q->type && ch == q->ch)
3182 struct GNUNET_MESH_Data *queued_data = q->cls;
3184 if (queued_data->mid == payload->mid)
3189 /* Message not found in the queue that we are going to use. */
3192 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! RETRANSMIT %u\n", copy->mid);
3194 send_prebuilt_message_channel (&payload->header, ch, ch->fwd_rel == rel);
3195 GNUNET_STATISTICS_update (stats, "# data retransmitted", 1, GNUNET_NO);
3199 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! ALREADY IN QUEUE %u\n", copy->mid);
3202 rel->retry_timer = GNUNET_TIME_STD_BACKOFF (rel->retry_timer);
3203 rel->retry_task = GNUNET_SCHEDULER_add_delayed (rel->retry_timer,
3204 &channel_retransmit_message,
3210 * Send keepalive packets for a connection.
3212 * @param c Connection to keep alive..
3213 * @param fwd Is this a FWD keepalive? (owner -> dest).
3216 connection_keepalive (struct MeshConnection *c, int fwd)
3218 struct GNUNET_MESH_ConnectionKeepAlive *msg;
3219 size_t size = sizeof (struct GNUNET_MESH_ConnectionKeepAlive);
3223 type = fwd ? GNUNET_MESSAGE_TYPE_MESH_FWD_KEEPALIVE :
3224 GNUNET_MESSAGE_TYPE_MESH_BCK_KEEPALIVE;
3226 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3227 "sending %s keepalive for connection %s[%d]\n",
3228 fwd ? "FWD" : "BCK",
3229 GNUNET_i2s (GNUNET_PEER_resolve2 (c->t->peer->id)),
3232 msg = (struct GNUNET_MESH_ConnectionKeepAlive *) cbuf;
3233 msg->header.size = htons (size);
3234 msg->header.type = htons (type);
3235 msg->cid = htonl (c->id);
3236 msg->tid = c->t->id;
3238 send_prebuilt_message_connection (&msg->header, c, NULL, fwd);
3243 * Send CONNECTION_{CREATE/ACK} packets for a connection.
3245 * @param c Connection for which to send the message.
3246 * @param fwd If GNUNET_YES, send CREATE, otherwise send ACK.
3249 connection_recreate (struct MeshConnection *c, int fwd)
3251 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "sending connection recreate\n");
3253 send_connection_create (c);
3255 send_connection_ack (c);
3260 * Generic connection timer management.
3261 * Depending on the role of the peer in the connection will send the
3262 * appropriate message (build or keepalive)
3264 * @param c Conncetion to maintain.
3265 * @param fwd Is FWD?
3268 connection_maintain (struct MeshConnection *c, int fwd)
3270 if (MESH_TUNNEL_SEARCHING == c->t->state)
3272 /* TODO DHT GET with RO_BART */
3277 case MESH_CONNECTION_NEW:
3279 case MESH_CONNECTION_SENT:
3280 connection_recreate (c, fwd);
3282 case MESH_CONNECTION_READY:
3283 connection_keepalive (c, fwd);
3292 connection_fwd_keepalive (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
3294 struct MeshConnection *c = cls;
3296 c->fwd_maintenance_task = GNUNET_SCHEDULER_NO_TASK;
3297 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
3300 connection_keepalive (c, GNUNET_YES);
3301 c->fwd_maintenance_task = GNUNET_SCHEDULER_add_delayed (refresh_connection_time,
3302 &connection_fwd_keepalive,
3308 connection_bck_keepalive (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
3310 struct MeshConnection *c = cls;
3312 c->bck_maintenance_task = GNUNET_SCHEDULER_NO_TASK;
3313 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
3316 connection_keepalive (c, GNUNET_NO);
3317 c->bck_maintenance_task = GNUNET_SCHEDULER_add_delayed (refresh_connection_time,
3318 &connection_bck_keepalive,
3324 * Send a message to all peers in this connection that the connection
3325 * is no longer valid.
3327 * If some peer should not receive the message, it should be zero'ed out
3328 * before calling this function.
3330 * @param c The connection whose peers to notify.
3333 connection_send_destroy (struct MeshConnection *c)
3335 struct GNUNET_MESH_ConnectionDestroy msg;
3337 msg.header.size = htons (sizeof (msg));
3338 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY);;
3339 msg.cid = htonl (c->id);
3341 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3342 " sending tunnel destroy for connection %s[%X]\n",
3343 GNUNET_i2s (GNUNET_PEER_resolve2 (c->t->peer->id)),
3346 send_prebuilt_message_connection (&msg.header, c, NULL, GNUNET_YES);
3347 send_prebuilt_message_connection (&msg.header, c, NULL, GNUNET_NO);
3352 * Send a message to all clients (local and remote) of this channel
3353 * notifying that the channel is no longer valid.
3355 * If some peer or client should not receive the message,
3356 * should be zero'ed out before calling this function.
3358 * @param ch The channel whose clients to notify.
3361 channel_send_destroy (struct MeshChannel *ch)
3363 struct GNUNET_MESH_ChannelDestroy msg;
3365 msg.header.size = htons (sizeof (msg));
3366 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY);
3367 msg.chid = htonl (ch->id);
3368 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3369 " sending tunnel destroy for channel %s:%X\n",
3370 GNUNET_i2s (GNUNET_PEER_resolve2 (ch->t->peer->id)),
3373 if (NULL != ch->owner)
3374 send_local_channel_destroy (ch, GNUNET_NO);
3376 send_prebuilt_message_channel (&msg.header, ch, GNUNET_NO);
3378 if (NULL != ch->client)
3379 send_local_channel_destroy (ch, GNUNET_YES);
3381 send_prebuilt_message_channel (&msg.header, ch, GNUNET_YES);
3388 * @param tid Tunnel ID.
3390 static struct MeshTunnel2 *
3391 tunnel_new (struct GNUNET_HashCode *tid)
3393 struct MeshTunnel2 *t;
3395 t = GNUNET_new (struct MeshTunnel2);
3397 t->next_chid = GNUNET_MESH_LOCAL_CHANNEL_ID_SERV;
3399 GNUNET_CONTAINER_multihashmap_put (tunnels, tid, t,
3400 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST))
3414 * @param tid Tunnel ID.
3416 static struct MeshTunnel2 *
3417 tunnel_get (const struct GNUNET_HashCode *tid)
3419 return GNUNET_CONTAINER_multihashmap_get (tunnels, tid);
3424 * Add a connection to a tunnel.
3427 * @param c Connection.
3430 tunnel_add_connection (struct MeshTunnel2 *t, struct MeshConnection *c)
3433 GNUNET_CONTAINER_DLL_insert_tail (t->connection_head, t->connection_tail, c);
3438 * Create a connection.
3440 * @param tid Tunnel ID.
3441 * @param cid Connection ID.
3443 static struct MeshConnection *
3444 connection_new (struct GNUNET_HashCode *tid, uint32_t cid)
3446 struct MeshConnection *c;
3447 struct MeshTunnel2 *t;
3449 t = tunnel_get (tid);
3452 t = tunnel_new (tid);
3460 c = GNUNET_new (struct MeshConnection);
3462 tunnel_add_connection (t, c);
3469 * Find a connection.
3471 * @param tid Tunnel ID.
3472 * @param cid Connection ID.
3474 static struct MeshConnection *
3475 connection_get (const struct GNUNET_HashCode *tid, uint32_t cid)
3477 struct MeshConnection *c;
3478 struct MeshTunnel2 *t;
3480 t = tunnel_get (tid);
3481 for (c = t->connection_head; NULL != c; c = c->next)
3490 * Connection is no longer needed: destroy it and remove from tunnel.
3492 * @param c Connection to destroy.
3495 connection_destroy (struct MeshConnection *c)
3497 struct MeshPeer *peer;
3502 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "destroying connection %s[%X]\n",
3503 GNUNET_i2s (GNUNET_PEER_resolve2 (c->t->peer->id)),
3506 peer = connection_get_next_hop (c);
3508 peer_cancel_queues (peer, c);
3509 peer = connection_get_prev_hop (c);
3511 peer_cancel_queues (peer, c);
3513 if (GNUNET_SCHEDULER_NO_TASK != c->fwd_maintenance_task)
3514 GNUNET_SCHEDULER_cancel (c->fwd_maintenance_task);
3515 if (GNUNET_SCHEDULER_NO_TASK != c->bck_maintenance_task)
3516 GNUNET_SCHEDULER_cancel (c->bck_maintenance_task);
3518 GNUNET_CONTAINER_DLL_remove (c->t->connection_head, c->t->connection_tail, c);
3520 GNUNET_STATISTICS_update (stats, "# connections", -1, GNUNET_NO);
3526 tunnel_destroy (struct MeshTunnel2 *t)
3528 struct MeshConnection *c;
3529 struct MeshConnection *next;
3534 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "destroying tunnel %s\n",
3535 GNUNET_i2s (GNUNET_PEER_resolve2 (c->t->peer->id)));
3537 if (GNUNET_YES != GNUNET_CONTAINER_multihashmap_remove (tunnels, &t->id, t))
3540 for (c = t->connection_head; NULL != c; c = next)
3543 connection_destroy (c);
3546 GNUNET_STATISTICS_update (stats, "# tunnels", -1, GNUNET_NO);
3553 * Tunnel is empty: destroy it.
3555 * Notifies all connections about the destruction.
3557 * @param t Tunnel to destroy.
3560 tunnel_destroy_empty (struct MeshTunnel2 *t)
3562 struct MeshConnection *c;
3564 for (c = t->connection_head; NULL != c; c = c->next)
3566 if (GNUNET_NO == c->destroy)
3567 connection_send_destroy (c);
3570 if (0 == t->pending_messages)
3573 t->destroy = GNUNET_YES;
3578 * Destroy tunnel if empty (no more channels).
3580 * @param t Tunnel to destroy if empty.
3583 tunnel_destroy_if_empty (struct MeshTunnel2 *t)
3585 if (NULL != t->channel_head)
3588 tunnel_destroy_empty (t);
3593 * Initialize a Flow Control structure to the initial state.
3595 * @param fc Flow Control structure to initialize.
3598 fc_init (struct MeshFlowControl *fc)
3600 fc->last_pid_sent = (uint32_t) -1; /* Next (expected) = 0 */
3601 fc->last_pid_recv = (uint32_t) -1;
3602 fc->last_ack_sent = (uint32_t) -1; /* No traffic allowed yet */
3603 fc->last_ack_recv = (uint32_t) -1;
3604 fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
3605 fc->poll_time = GNUNET_TIME_UNIT_SECONDS;
3611 * Destroy a channel and free all resources.
3613 * @param ch Channel to destroy.
3616 channel_destroy (struct MeshChannel *ch)
3618 struct MeshClient *c;
3626 if (GNUNET_YES != GNUNET_CONTAINER_multihashmap32_remove (c->own_channels,
3637 GNUNET_CONTAINER_multihashmap32_remove (c->incoming_channels,
3644 if (GNUNET_YES == ch->reliable)
3646 channel_rel_free_all (ch->fwd_rel);
3647 channel_rel_free_all (ch->bck_rel);
3650 GNUNET_CONTAINER_DLL_remove (ch->t->channel_head, ch->t->channel_tail, ch);
3651 GNUNET_STATISTICS_update (stats, "# channels", -1, GNUNET_NO);
3657 * Create a new channel.
3659 * @param owner Clients that owns the channel, NULL for foreign channels.
3660 * @param id Channel Number for the channel, for the owner point of view.
3662 * @return A new initialized channel. NULL on error.
3664 static struct MeshChannel *
3665 channel_new (struct MeshClient *owner,
3666 MESH_ChannelNumber id)
3668 struct MeshChannel *ch;
3673 ch = GNUNET_new (struct MeshChannel);
3677 GNUNET_STATISTICS_update (stats, "# channels", 1, GNUNET_NO);
3680 GNUNET_CONTAINER_multihashmap32_put (owner->own_channels, id, ch,
3681 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
3684 channel_destroy (ch);
3685 GNUNET_SERVER_receive_done (owner->handle, GNUNET_SYSERR);
3694 * Set options in a channel, extracted from a bit flag field
3696 * @param ch Channel to set options to.
3697 * @param options Bit array in host byte order.
3700 channel_set_options (struct MeshChannel *ch, uint32_t options)
3702 ch->nobuffer = (options & GNUNET_MESH_OPTION_NOBUFFER) != 0 ?
3703 GNUNET_YES : GNUNET_NO;
3704 ch->reliable = (options & GNUNET_MESH_OPTION_RELIABLE) != 0 ?
3705 GNUNET_YES : GNUNET_NO;
3710 * Iterator for deleting each channel whose client endpoint disconnected.
3712 * @param cls Closure (client that has disconnected).
3713 * @param key The local channel id (used to access the hashmap).
3714 * @param value The value stored at the key (channel to destroy).
3716 * @return GNUNET_OK, keep iterating.
3719 channel_destroy_iterator (void *cls,
3723 struct MeshChannel *ch = value;
3724 struct MeshClient *c = cls;
3725 struct MeshTunnel2 *t;
3727 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3728 " Channel %X / %X destroy, due to client %u shutdown.\n",
3729 ch->id, ch->id_dest, c->id);
3731 if (c == ch->client)
3733 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Client %u is destination.\n", c->id);
3738 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Client %u is owner.\n", c->id);
3743 channel_send_destroy (ch);
3744 channel_destroy (ch);
3745 tunnel_destroy_if_empty (t);
3752 * Remove client's ports from the global hashmap on disconnect.
3754 * @param cls Closure (unused).
3756 * @param value Client structure.
3758 * @return GNUNET_OK, keep iterating.
3761 client_release_ports (void *cls,
3767 res = GNUNET_CONTAINER_multihashmap32_remove (ports, key, value);
3768 if (GNUNET_YES != res)
3771 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3772 "Port %u by client %p was not registered.\n",
3780 * Timeout function due to lack of keepalive/traffic from the owner.
3781 * Destroys connection if called.
3783 * @param cls Closure (connection to destroy).
3784 * @param tc TaskContext.
3787 connection_fwd_timeout (void *cls,
3788 const struct GNUNET_SCHEDULER_TaskContext *tc)
3790 struct MeshConnection *c = cls;
3792 c->fwd_maintenance_task = GNUNET_SCHEDULER_NO_TASK;
3793 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
3795 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3796 "Connection %s[%X] FWD timed out. Destroying.\n",
3797 GNUNET_i2s(GNUNET_PEER_resolve2 (c->t->peer->id)),
3800 if (NULL != c->t->channel_head) /* If local, leave TODO review */
3803 connection_destroy (c);
3808 * Timeout function due to lack of keepalive/traffic from the destination.
3809 * Destroys connection if called.
3811 * @param cls Closure (connection to destroy).
3812 * @param tc TaskContext
3815 connection_bck_timeout (void *cls,
3816 const struct GNUNET_SCHEDULER_TaskContext *tc)
3818 struct MeshConnection *c = cls;
3820 c->bck_maintenance_task = GNUNET_SCHEDULER_NO_TASK;
3821 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
3824 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3825 "Connection %s[%X] FWD timed out. Destroying.\n",
3826 GNUNET_i2s(GNUNET_PEER_resolve2 (c->t->peer->id)),
3829 if (NULL != c->t->channel_head) /* If local, leave TODO review */
3832 connection_destroy (c);
3837 * Resets the connection timeout task, some other message has done the
3839 * - For the first peer on the direction this means to send
3840 * a keepalive or a path confirmation message (either create or ACK).
3841 * - For all other peers, this means to destroy the connection,
3842 * due to lack of activity.
3843 * Starts the tiemout if no timeout was running (connection just created).
3845 * @param c Connection whose timeout to reset.
3846 * @param fwd Is this forward?
3848 * TODO use heap to improve efficiency of scheduler.
3851 connection_reset_timeout (struct MeshConnection *c, int fwd)
3853 GNUNET_SCHEDULER_TaskIdentifier *ti;
3854 GNUNET_SCHEDULER_Task f;
3856 ti = fwd ? &c->fwd_maintenance_task : &c->bck_maintenance_task;
3858 if (GNUNET_SCHEDULER_NO_TASK != *ti)
3859 GNUNET_SCHEDULER_cancel (*ti);
3861 if (NULL != c->t->channel_head) /* Endpoint */
3863 f = fwd ? &connection_fwd_keepalive : &connection_bck_keepalive;
3864 *ti = GNUNET_SCHEDULER_add_delayed (refresh_connection_time, f, c);
3868 struct GNUNET_TIME_Relative delay;
3870 delay = GNUNET_TIME_relative_multiply (refresh_connection_time, 4);
3871 f = fwd ? &connection_fwd_timeout : &connection_bck_timeout;
3872 *ti = GNUNET_SCHEDULER_add_delayed (delay, f, c);
3877 /******************************************************************************/
3878 /**************** MESH NETWORK HANDLER HELPERS ***********************/
3879 /******************************************************************************/
3882 * Free a transmission that was already queued with all resources
3883 * associated to the request.
3885 * @param queue Queue handler to cancel.
3886 * @param clear_cls Is it necessary to free associated cls?
3889 queue_destroy (struct MeshPeerQueue *queue, int clear_cls)
3891 struct MeshFlowControl *fc;
3893 fc = queue->peer->fc;
3894 if (GNUNET_YES == clear_cls)
3896 switch (queue->type)
3898 case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_DESTROY:
3899 GNUNET_log (GNUNET_ERROR_TYPE_INFO, "destroying CONNECTION_DESTROY\n");
3900 GNUNET_break (GNUNET_YES == queue->c->destroy);
3902 case GNUNET_MESSAGE_TYPE_MESH_FWD:
3903 case GNUNET_MESSAGE_TYPE_MESH_BCK:
3904 case GNUNET_MESSAGE_TYPE_MESH_ACK:
3905 case GNUNET_MESSAGE_TYPE_MESH_POLL:
3906 case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_ACK:
3907 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " prebuilt message\n");
3908 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " type %s\n",
3909 GNUNET_MESH_DEBUG_M2S (queue->type));
3912 case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_CREATE:
3913 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " type create path\n");
3918 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, " type %s unknown!\n",
3919 GNUNET_MESH_DEBUG_M2S (queue->type));
3921 GNUNET_free_non_null (queue->cls);
3923 GNUNET_CONTAINER_DLL_remove (fc->queue_head, fc->queue_tail, queue);
3927 GNUNET_free (queue);
3931 queue_send (void *cls, size_t size, void *buf)
3933 struct MeshPeer *peer = cls;
3934 const struct GNUNET_PeerIdentity *dst_id;
3935 struct GNUNET_MessageHeader *msg;
3936 struct MeshPeerQueue *queue;
3937 struct MeshTunnel2 *t;
3938 struct MeshFlowControl *fc;
3939 struct MeshConnection *c;
3951 fc->core_transmit = NULL;
3953 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* Queue send\n");
3955 if (NULL == buf || 0 == size)
3957 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* Buffer size 0.\n");
3960 queue = fc->queue_head;
3962 /* Queue has no traffic */
3965 GNUNET_break (0); /* Core tmt_rdy should've been canceled */
3969 dst_id = GNUNET_PEER_resolve2 (peer->id);
3970 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* towards %s\n", GNUNET_i2s (dst_id));
3971 /* Check if buffer size is enough for the message */
3972 if (queue->size > size)
3974 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* not enough room, reissue\n");
3976 GNUNET_CORE_notify_transmit_ready (core_handle,
3979 GNUNET_TIME_UNIT_FOREVER_REL,
3986 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* size ok\n");
3989 t = (NULL != c) ? c->t : NULL;
3993 switch (queue->type)
3995 case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_DESTROY:
3996 case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_BROKEN:
3997 case GNUNET_MESSAGE_TYPE_MESH_FWD:
3998 case GNUNET_MESSAGE_TYPE_MESH_BCK:
3999 case GNUNET_MESSAGE_TYPE_MESH_ACK:
4000 case GNUNET_MESSAGE_TYPE_MESH_POLL:
4001 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4003 GNUNET_MESH_DEBUG_M2S (queue->type));
4005 case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
4006 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
4007 data_size = send_core_data_raw (queue->cls, size, buf);
4008 msg = (struct GNUNET_MessageHeader *) buf;
4009 type = ntohs (msg->type);
4011 case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_CREATE:
4012 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* path create\n");
4013 if (NULL != c->t->channel_head)
4014 data_size = send_core_connection_create (queue->cls, size, buf);
4016 data_size = send_core_data_raw (queue->cls, size, buf);
4018 case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_ACK:
4019 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* path ack\n");
4020 if (NULL != c->t->channel_head)
4021 data_size = send_core_connection_ack (queue->cls, size, buf);
4023 data_size = send_core_data_raw (queue->cls, size, buf);
4027 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "* type unknown: %u\n",
4034 if (0 < drop_percent &&
4035 GNUNET_CRYPTO_random_u32(GNUNET_CRYPTO_QUALITY_WEAK, 101) < drop_percent)
4037 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
4038 "Dropping message of type %s\n",
4039 GNUNET_MESH_DEBUG_M2S (queue->type));
4042 /* Free queue, but cls was freed by send_core_* */
4043 queue_destroy (queue, GNUNET_NO);
4045 /* Send ACK if needed, after accounting for sent ID in fc->queue_n */
4049 case GNUNET_MESSAGE_TYPE_MESH_FWD:
4052 case GNUNET_MESSAGE_TYPE_MESH_BCK:
4053 pid = ntohl ( ((struct GNUNET_MESH_Encrypted *) buf)->pid );
4054 fc->last_pid_sent = pid;
4055 connection_send_ack (c, fwd);
4061 /* If more data in queue, send next */
4062 queue = fc->queue_head;
4065 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* more data!\n");
4066 if (NULL == fc->core_transmit) {
4067 peer->fc->core_transmit =
4068 GNUNET_CORE_notify_transmit_ready(core_handle,
4071 GNUNET_TIME_UNIT_FOREVER_REL,
4079 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4080 "* tmt rdy called somewhere else\n");
4082 if (GNUNET_SCHEDULER_NO_TASK == fc->poll_task)
4084 GNUNET_log (GNUNET_ERROR_TYPE_INFO, "* %s starting poll timeout\n");
4086 GNUNET_SCHEDULER_add_delayed (fc->poll_time, &peer_poll, fc);
4091 if (GNUNET_SCHEDULER_NO_TASK != fc->poll_task)
4093 GNUNET_SCHEDULER_cancel (fc->poll_task);
4094 fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
4099 c->pending_messages--;
4100 if (GNUNET_YES == c->destroy && 0 == c->pending_messages)
4102 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* destroying connection!\n");
4103 connection_destroy (c);
4109 t->pending_messages--;
4110 if (GNUNET_YES == t->destroy && 0 == t->pending_messages)
4112 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* destroying tunnel!\n");
4116 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* Return %d\n", data_size);
4122 queue_add (void *cls, uint16_t type, size_t size,
4123 struct MeshPeer *dst,
4124 struct MeshConnection *c,
4125 struct MeshChannel *ch)
4127 struct MeshPeerQueue *queue;
4128 struct MeshFlowControl *fc;
4140 if (GNUNET_MESSAGE_TYPE_MESH_POLL == type ||
4141 GNUNET_MESSAGE_TYPE_MESH_ACK == type)
4145 ( (NULL != ch->owner && GNUNET_MESSAGE_TYPE_MESH_FWD == type) ||
4146 (NULL != ch->client && GNUNET_MESSAGE_TYPE_MESH_BCK == type) ))
4149 if (fc->queue_n >= fc->queue_max && 0 == priority)
4151 GNUNET_STATISTICS_update (stats, "# messages dropped (buffer full)",
4154 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4155 "queue full: %u/%u\n",
4156 fc->queue_n, fc->queue_max);
4157 return; /* Drop this message */
4161 if (GMC_is_pid_bigger(fc->last_pid_sent + 1, fc->last_ack_recv) &&
4162 GNUNET_SCHEDULER_NO_TASK == fc->poll_task)
4163 fc->poll_task = GNUNET_SCHEDULER_add_delayed (fc->poll_time,
4166 queue = GNUNET_malloc (sizeof (struct MeshPeerQueue));
4173 if (100 <= priority)
4174 GNUNET_CONTAINER_DLL_insert (fc->queue_head, fc->queue_tail, queue);
4176 GNUNET_CONTAINER_DLL_insert_tail (fc->queue_head, fc->queue_tail, queue);
4178 if (NULL == fc->core_transmit)
4181 GNUNET_CORE_notify_transmit_ready (core_handle,
4184 GNUNET_TIME_UNIT_FOREVER_REL,
4185 GNUNET_PEER_resolve2 (dst->id),
4190 c->pending_messages++;
4191 c->t->pending_messages++;
4195 /******************************************************************************/
4196 /******************** MESH NETWORK HANDLERS **************************/
4197 /******************************************************************************/
4201 * Generic handler for mesh network payload traffic.
4203 * @param t Tunnel on which we got this message.
4204 * @param message Data message.
4205 * @param fwd Is this FWD traffic? GNUNET_YES : GNUNET_NO;
4207 * @return GNUNET_OK to keep the connection open,
4208 * GNUNET_SYSERR to close it (signal serious error)
4211 handle_data (struct MeshTunnel2 *t, const struct GNUNET_MESH_Data *msg, int fwd)
4213 struct MeshChannelReliability *rel;
4214 struct MeshChannel *ch;
4215 struct MeshClient *c;
4221 size = ntohs (msg->header.size);
4223 sizeof (struct GNUNET_MESH_Data) +
4224 sizeof (struct GNUNET_MessageHeader))
4229 type = ntohs (msg->header.type);
4230 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "got a %s message\n",
4231 GNUNET_MESH_DEBUG_M2S (type));
4232 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " payload of type %s\n",
4233 GNUNET_MESH_DEBUG_M2S (ntohs (msg[1].header.type)));
4236 ch = channel_get (t, ntohl (msg->chid));
4239 GNUNET_STATISTICS_update (stats, "# data on unknown channel", 1, GNUNET_NO);
4240 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "WARNING channel unknown\n");
4244 /* Initialize FWD/BCK data */
4245 c = fwd ? ch->client : ch->owner;
4246 rel = fwd ? ch->bck_rel : ch->fwd_rel;
4254 tunnel_change_state (t, MESH_TUNNEL_READY);
4256 GNUNET_STATISTICS_update (stats, "# data received", 1, GNUNET_NO);
4258 mid = ntohl (msg->mid);
4259 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " mid %u\n", mid);
4261 if (GNUNET_NO == ch->reliable ||
4262 ( !GMC_is_pid_bigger (rel->mid_recv, mid) &&
4263 GMC_is_pid_bigger (rel->mid_recv + 64, mid) ) )
4265 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! RECV %u\n", mid);
4266 if (GNUNET_YES == ch->reliable)
4268 /* Is this the exact next expected messasge? */
4269 if (mid == rel->mid_recv)
4271 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "as expected\n");
4273 channel_send_client_data (ch, msg, fwd);
4274 channel_send_client_buffered_data (ch, c, rel);
4278 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "save for later\n");
4279 channel_rel_add_buffered_data (msg, rel);
4282 else /* Tunnel unreliable, send to clients directly */
4284 channel_send_client_data (ch, msg, fwd);
4289 GNUNET_break_op (0);
4290 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4291 " MID %u not expected (%u - %u), dropping!\n",
4292 mid, rel->mid_recv, rel->mid_recv + 64);
4295 channel_send_data_ack (ch, fwd);
4301 * Handler for mesh network traffic going from the origin to a peer
4303 * @param t Tunnel on which we got this message.
4304 * @param message Data message.
4306 * @return GNUNET_OK to keep the connection open,
4307 * GNUNET_SYSERR to close it (signal serious error)
4310 handle_unicast (struct MeshTunnel2 *t, const struct GNUNET_MESH_Data *message)
4312 return handle_data (t, message, GNUNET_YES);
4317 * Handler for mesh network traffic towards the owner of a tunnel.
4319 * @param t Tunnel on which we got this message.
4320 * @param message Data message.
4322 * @return GNUNET_OK to keep the connection open,
4323 * GNUNET_SYSERR to close it (signal serious error)
4326 handle_to_orig (struct MeshTunnel2 *t, const struct GNUNET_MESH_Data *message)
4328 return handle_data (t, message, GNUNET_NO);
4333 * Handler for mesh network traffic end-to-end ACKs.
4335 * @param t Tunnel on which we got this message.
4336 * @param message Data message.
4337 * @param fwd Is this a fwd ACK? (dest->orig)
4339 * @return GNUNET_OK to keep the connection open,
4340 * GNUNET_SYSERR to close it (signal serious error)
4343 handle_data_ack (struct MeshTunnel2 *t,
4344 const struct GNUNET_MESH_DataACK *msg, int fwd)
4346 struct MeshChannelReliability *rel;
4347 struct MeshReliableMessage *copy;
4348 struct MeshReliableMessage *next;
4349 struct MeshChannel *ch;
4354 type = ntohs (msg->header.type);
4355 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got a %s message!\n",
4356 GNUNET_MESH_DEBUG_M2S (type));
4357 ch = channel_get (t, ntohl (msg->chid));
4360 GNUNET_STATISTICS_update (stats, "# ack on unknown channel", 1, GNUNET_NO);
4363 ack = ntohl (msg->mid);
4364 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! %s ACK %u\n",
4365 (GNUNET_YES == fwd) ? "FWD" : "BCK", ack);
4367 if (GNUNET_YES == fwd && GNUNET_MESSAGE_TYPE_MESH_UNICAST_ACK == type)
4371 else if (GNUNET_NO == fwd && GNUNET_MESSAGE_TYPE_MESH_TO_ORIG_ACK == type)
4380 for (work = GNUNET_NO, copy = rel->head_sent; copy != NULL; copy = next)
4382 if (GMC_is_pid_bigger (copy->mid, ack))
4384 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! head %u, out!\n", copy->mid);
4385 channel_rel_free_sent (rel, msg);
4389 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! id %u\n", copy->mid);
4391 rel_message_free (copy);
4393 /* ACK client if needed */
4394 // channel_send_ack (t, type, GNUNET_MESSAGE_TYPE_MESH_UNICAST_ACK == type);
4396 /* If some message was free'd, update the retransmission delay*/
4397 if (GNUNET_YES == work)
4399 if (GNUNET_SCHEDULER_NO_TASK != rel->retry_task)
4401 GNUNET_SCHEDULER_cancel (rel->retry_task);
4402 if (NULL == rel->head_sent)
4404 rel->retry_task = GNUNET_SCHEDULER_NO_TASK;
4408 struct GNUNET_TIME_Absolute new_target;
4409 struct GNUNET_TIME_Relative delay;
4411 delay = GNUNET_TIME_relative_multiply (rel->retry_timer,
4412 MESH_RETRANSMIT_MARGIN);
4413 new_target = GNUNET_TIME_absolute_add (rel->head_sent->timestamp,
4415 delay = GNUNET_TIME_absolute_get_remaining (new_target);
4417 GNUNET_SCHEDULER_add_delayed (delay,
4418 &channel_retransmit_message,
4430 * Core handler for connection creation.
4432 * @param cls Closure (unused).
4433 * @param peer Sender (neighbor).
4434 * @param message Message.
4436 * @return GNUNET_OK to keep the connection open,
4437 * GNUNET_SYSERR to close it (signal serious error)
4440 handle_mesh_connection_create (void *cls,
4441 const struct GNUNET_PeerIdentity *peer,
4442 const struct GNUNET_MessageHeader *message)
4444 struct GNUNET_MESH_ConnectionCreate *msg;
4445 struct GNUNET_PeerIdentity *id;
4446 struct GNUNET_HashCode *tid;
4447 struct MeshPeerPath *path;
4448 struct MeshPeer *dest_peer;
4449 struct MeshPeer *orig_peer;
4450 struct MeshConnection *c;
4451 unsigned int own_pos;
4456 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received a connection create msg\n");
4459 size = ntohs (message->size);
4460 if (size < sizeof (struct GNUNET_MESH_ConnectionCreate))
4462 GNUNET_break_op (0);
4466 /* Calculate hops */
4467 size -= sizeof (struct GNUNET_MESH_ConnectionCreate);
4468 if (size % sizeof (struct GNUNET_PeerIdentity))
4470 GNUNET_break_op (0);
4473 size /= sizeof (struct GNUNET_PeerIdentity);
4476 GNUNET_break_op (0);
4479 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " path has %u hops.\n", size);
4481 /* Get parameters */
4482 msg = (struct GNUNET_MESH_ConnectionCreate *) message;
4483 cid = ntohl (msg->cid);
4485 id = (struct GNUNET_PeerIdentity *) &msg[1];
4486 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4487 " connection %s[%X] (%s).\n",
4488 GNUNET_h2s (tid), cid, GNUNET_i2s (id));
4490 /* Create connection */
4491 c = connection_get (tid, cid);
4494 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Creating connection\n");
4495 c = connection_new (tid, cid);
4499 connection_reset_timeout (c, GNUNET_YES);
4500 tunnel_change_state (c->t, MESH_TUNNEL_WAITING);
4502 /* Remember peers */
4503 dest_peer = peer_get (&id[size - 1]);
4504 orig_peer = peer_get (&id[0]);
4507 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Creating path...\n");
4508 path = path_new (size);
4510 for (i = 0; i < size; i++)
4512 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ... adding %s\n",
4513 GNUNET_i2s (&id[i]));
4514 path->peers[i] = GNUNET_PEER_intern (&id[i]);
4515 if (path->peers[i] == myid)
4518 if (own_pos == 0 && path->peers[own_pos] != myid)
4520 /* create path: self not found in path through self */
4521 GNUNET_break_op (0);
4522 path_destroy (path);
4523 connection_destroy (c);
4526 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Own position: %u\n", own_pos);
4527 path_add_to_peers (path, GNUNET_NO);
4529 c->own_pos = own_pos;
4531 /* Is it a connection to us? */
4532 if (own_pos == size - 1)
4534 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " It's for us!\n");
4535 peer_add_path_to_origin (orig_peer, path, GNUNET_YES);
4537 send_connection_ack (c);
4539 /* Keep tunnel alive in direction dest->owner*/
4540 connection_reset_timeout (c, GNUNET_NO);
4544 /* It's for somebody else! Retransmit. */
4545 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Retransmitting.\n");
4546 peer_add_path (dest_peer, path_duplicate (path), GNUNET_NO);
4547 peer_add_path_to_origin (orig_peer, path, GNUNET_NO);
4548 send_prebuilt_message_connection (message, c, NULL, GNUNET_YES);
4555 * Core handler for path ACKs
4557 * @param cls closure
4558 * @param message message
4559 * @param peer peer identity this notification is about
4561 * @return GNUNET_OK to keep the connection open,
4562 * GNUNET_SYSERR to close it (signal serious error)
4565 handle_mesh_connection_ack (void *cls, const struct GNUNET_PeerIdentity *peer,
4566 const struct GNUNET_MessageHeader *message)
4568 struct GNUNET_MESH_ConnectionACK *msg;
4569 struct MeshPeerPath *p;
4570 struct MeshConnection *c;
4573 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received a connection ACK msg\n");
4574 msg = (struct GNUNET_MESH_ConnectionACK *) message;
4575 cid = ntohl(msg->cid);
4576 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " on connection %s[%X]\n",
4577 GNUNET_h2s (&msg->tid), cid);
4578 c = connection_get (&msg->tid, cid);
4581 GNUNET_STATISTICS_update (stats, "# control on unknown connection",
4583 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " don't know the connection!\n");
4587 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " via peer %s\n",
4590 /* Add path to peers? */
4594 path_add_to_peers (p, GNUNET_YES);
4600 connection_change_state (c, MESH_CONNECTION_READY);
4601 connection_reset_timeout (c, GNUNET_NO);
4603 /* Message for us? */
4604 if (NULL != c->t->channel_head)
4606 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " It's for us!\n");
4607 if (3 <= tunnel_count_connections(c->t) && NULL != c->t->peer->dhtget)
4609 GNUNET_DHT_get_stop (c->t->peer->dhtget);
4610 c->t->peer->dhtget = NULL;
4612 //connection_send_ack (c, GNUNET_NO); /* FIXME */
4616 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " not for us, retransmitting...\n");
4617 send_prebuilt_message_connection (message, c, NULL, GNUNET_NO);
4623 * Core handler for notifications of broken paths
4625 * @param cls Closure (unused).
4626 * @param peer Peer identity of sending neighbor.
4627 * @param message Message.
4629 * @return GNUNET_OK to keep the connection open,
4630 * GNUNET_SYSERR to close it (signal serious error)
4633 handle_mesh_connection_broken (void *cls, const struct GNUNET_PeerIdentity *peer,
4634 const struct GNUNET_MessageHeader *message)
4636 struct GNUNET_MESH_ConnectionBroken *msg;
4637 struct MeshConnection *c;
4639 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4640 "Received a CONNECTION BROKEN msg from %s\n", GNUNET_i2s (peer));
4641 msg = (struct GNUNET_MESH_ConnectionBroken *) message;
4642 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " regarding %s\n",
4643 GNUNET_i2s (&msg->peer1));
4644 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " regarding %s\n",
4645 GNUNET_i2s (&msg->peer2));
4646 c = connection_get (&msg->tid, ntohl (msg->cid));
4649 GNUNET_break_op (0);
4652 tunnel_notify_connection_broken (c->t, GNUNET_PEER_search (&msg->peer1),
4653 GNUNET_PEER_search (&msg->peer2));
4660 * Core handler for tunnel destruction
4662 * @param cls Closure (unused).
4663 * @param peer Peer identity of sending neighbor.
4664 * @param message Message.
4666 * @return GNUNET_OK to keep the connection open,
4667 * GNUNET_SYSERR to close it (signal serious error)
4670 handle_mesh_connection_destroy (void *cls,
4671 const struct GNUNET_PeerIdentity *peer,
4672 const struct GNUNET_MessageHeader *message)
4674 struct GNUNET_MESH_ConnectionDestroy *msg;
4675 struct MeshConnection *c;
4676 struct MeshTunnel2 *t;
4677 struct MeshPeer *neighbor;
4679 msg = (struct GNUNET_MESH_ConnectionDestroy *) message;
4680 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4681 "Got a CONNECTION DESTROY message from %s\n",
4683 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4684 " for connection %s[%X]\n",
4685 GNUNET_h2s (&msg->tid), ntohl (msg->cid));
4686 c = connection_get (&msg->tid, ntohl (msg->cid));
4689 /* Probably already got the message from another path,
4690 * destroyed the tunnel and retransmitted to children.
4693 GNUNET_STATISTICS_update (stats, "# control on unknown tunnel",
4697 neighbor = peer_get (peer);
4698 if (neighbor == connection_get_prev_hop (c))
4699 neighbor = connection_get_next_hop (c);
4700 else if (neighbor == connection_get_next_hop (c))
4701 neighbor = connection_get_prev_hop (c);
4704 GNUNET_break_op (0);
4707 send_prebuilt_message_peer (message, neighbor);
4709 connection_destroy (c);
4710 tunnel_destroy_if_empty (t);
4717 * Generic handler for mesh network encrypted traffic.
4719 * @param peer Peer identity this notification is about.
4720 * @param message Encrypted message.
4721 * @param fwd Is this FWD traffic? GNUNET_YES : GNUNET_NO;
4723 * @return GNUNET_OK to keep the connection open,
4724 * GNUNET_SYSERR to close it (signal serious error)
4727 handle_mesh_encrypted (const struct GNUNET_PeerIdentity *peer,
4728 const struct GNUNET_MESH_Encrypted *msg,
4731 struct MeshConnection *c;
4732 struct MeshTunnel2 *t;
4733 struct MeshPeer *neighbor;
4734 struct MeshFlowControl *fc;
4741 size = ntohs (msg->header.size);
4743 sizeof (struct GNUNET_MESH_Encrypted) +
4744 sizeof (struct GNUNET_MessageHeader))
4749 type = ntohs (msg->header.type);
4750 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "got a %s message from %s\n",
4751 GNUNET_MESH_DEBUG_M2S (type), GNUNET_i2s (peer));
4753 /* Check connection */
4754 c = connection_get (&msg->tid, ntohl (msg->cid));
4757 GNUNET_STATISTICS_update (stats, "# unknown connection", 1, GNUNET_NO);
4758 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "WARNING connection unknown\n");
4763 /* Check neighbor status */
4764 neighbor = peer_get (peer);
4773 pid = ntohl (msg->pid);
4774 if (GMC_is_pid_bigger (pid, fc->last_ack_sent))
4776 GNUNET_STATISTICS_update (stats, "# unsolicited data", 1, GNUNET_NO);
4777 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4778 "WARNING Received PID %u, (prev %u), ACK %u\n",
4779 pid, fc->last_pid_recv, fc->last_ack_sent);
4782 if (MESH_CONNECTION_SENT == c->state)
4783 connection_change_state (c, MESH_CONNECTION_READY);
4784 connection_reset_timeout (c, fwd);
4786 /* Is this message for us? */
4787 if (NULL != c->t->channel_head)
4789 /* TODO signature verification */
4790 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " it's for us! sending to client\n");
4791 GNUNET_STATISTICS_update (stats, "# data received", 1, GNUNET_NO);
4792 if (GMC_is_pid_bigger (pid, fc->last_pid_recv))
4796 mid = ntohl (msg->mid);
4797 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4798 " pid %u (mid %u) not seen yet\n", pid, mid);
4799 fc->last_pid_recv = pid;
4801 if (GNUNET_NO == t->reliable ||
4802 ( !GMC_is_pid_bigger (rel->mid_recv, mid) &&
4803 GMC_is_pid_bigger (rel->mid_recv + 64, mid) ) )
4805 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4806 "!!! RECV %u\n", ntohl (msg->mid));
4807 if (GNUNET_YES == t->reliable)
4809 /* Is this the exact next expected messasge? */
4810 if (mid == rel->mid_recv)
4812 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "as expected\n");
4814 tunnel_send_client_data (t, msg, fwd);
4815 tunnel_send_client_buffered_data (t, c, rel);
4819 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "save for later\n");
4820 tunnel_add_buffered_data (t, msg, rel);
4823 else /* Tunnel unreliable, send to clients directly */
4825 tunnel_send_client_data (t, msg, fwd);
4830 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4831 " MID %u not expected (%u - %u), dropping!\n",
4832 ntohl (msg->mid), rel->mid_recv, rel->mid_recv + 64);
4837 // GNUNET_STATISTICS_update (stats, "# duplicate PID", 1, GNUNET_NO);
4838 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4839 " Pid %u not expected (%u+), dropping!\n",
4840 pid, fc->last_pid_recv + 1);
4842 tunnel_send_ack (t, type, fwd);
4845 fc->last_pid_recv = pid;
4848 GNUNET_STATISTICS_update (stats, "# data on dying tunnel", 1, GNUNET_NO);
4849 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "data on dying tunnel %s[%X]\n",
4850 GNUNET_PEER_resolve2 (t->id.oid), ntohl (msg->tid));
4851 return GNUNET_OK; /* Next hop has destoyed the tunnel, drop */
4853 ttl = ntohl (msg->ttl);
4854 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ttl: %u\n", ttl);
4857 GNUNET_STATISTICS_update (stats, "# TTL drops", 1, GNUNET_NO);
4858 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, " TTL is 0, DROPPING!\n");
4859 tunnel_send_ack (t, GNUNET_MESSAGE_TYPE_MESH_ACK, fwd);
4865 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " not for us, retransmitting...\n");
4866 send_prebuilt_message (message, hop, t);
4867 GNUNET_STATISTICS_update (stats, "# unicast forwarded", 1, GNUNET_NO);
4874 * Core handler for mesh network traffic going orig->dest.
4876 * @param cls Closure (unused).
4877 * @param message Message received.
4878 * @param peer Peer who sent the message.
4880 * @return GNUNET_OK to keep the connection open,
4881 * GNUNET_SYSERR to close it (signal serious error)
4884 handle_mesh_fwd (void *cls, const struct GNUNET_PeerIdentity *peer,
4885 const struct GNUNET_MessageHeader *message)
4887 return handle_mesh_encrypted (peer,
4888 (struct GNUNET_MESH_Encrypted *)message,
4893 * Core handler for mesh network traffic going dest->orig.
4895 * @param cls Closure (unused).
4896 * @param message Message received.
4897 * @param peer Peer who sent the message.
4899 * @return GNUNET_OK to keep the connection open,
4900 * GNUNET_SYSERR to close it (signal serious error)
4903 handle_mesh_bck (void *cls, const struct GNUNET_PeerIdentity *peer,
4904 const struct GNUNET_MessageHeader *message)
4906 return handle_mesh_encrypted (peer,
4907 (struct GNUNET_MESH_Encrypted *)message,
4913 * Core handler for mesh network traffic point-to-point acks.
4915 * @param cls closure
4916 * @param message message
4917 * @param peer peer identity this notification is about
4919 * @return GNUNET_OK to keep the connection open,
4920 * GNUNET_SYSERR to close it (signal serious error)
4923 handle_mesh_ack (void *cls, const struct GNUNET_PeerIdentity *peer,
4924 const struct GNUNET_MessageHeader *message)
4926 struct GNUNET_MESH_ACK *msg;
4927 struct MeshTunnel *t;
4928 struct MeshFlowControl *fc;
4932 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got an ACK packet from %s!\n",
4934 msg = (struct GNUNET_MESH_ACK *) message;
4936 t = channel_get (&msg->oid, ntohl (msg->tid));
4940 /* TODO notify that we dont know this tunnel (whom)? */
4941 GNUNET_STATISTICS_update (stats, "# ack on unknown tunnel", 1, GNUNET_NO);
4944 ack = ntohl (msg->pid);
4945 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ACK %u\n", ack);
4947 /* Is this a forward or backward ACK? */
4948 id = GNUNET_PEER_search (peer);
4949 if (t->next_hop == id)
4951 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " FWD ACK\n");
4954 else if (t->prev_hop == id)
4956 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " BCK ACK\n");
4961 GNUNET_break_op (0);
4965 if (GNUNET_SCHEDULER_NO_TASK != fc->poll_task &&
4966 GMC_is_pid_bigger (ack, fc->last_ack_recv))
4968 GNUNET_SCHEDULER_cancel (fc->poll_task);
4969 fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
4970 fc->poll_time = GNUNET_TIME_UNIT_SECONDS;
4973 fc->last_ack_recv = ack;
4974 peer_unlock_queue (id);
4975 tunnel_change_state (t, MESH_TUNNEL_READY);
4977 tunnel_send_ack (t, GNUNET_MESSAGE_TYPE_MESH_ACK, t->next_hop == id);
4984 * Core handler for mesh network traffic point-to-point ack polls.
4986 * @param cls closure
4987 * @param message message
4988 * @param peer peer identity this notification is about
4990 * @return GNUNET_OK to keep the connection open,
4991 * GNUNET_SYSERR to close it (signal serious error)
4994 handle_mesh_poll (void *cls, const struct GNUNET_PeerIdentity *peer,
4995 const struct GNUNET_MessageHeader *message)
4997 struct GNUNET_MESH_Poll *msg;
4998 struct MeshTunnel *t;
4999 struct MeshFlowControl *fc;
5004 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got a POLL packet from %s!\n",
5007 msg = (struct GNUNET_MESH_Poll *) message;
5009 t = channel_get (&msg->oid, ntohl (msg->tid));
5013 /* TODO notify that we dont know this tunnel (whom)? */
5014 GNUNET_STATISTICS_update (stats, "# poll on unknown tunnel", 1, GNUNET_NO);
5015 GNUNET_break_op (0);
5019 /* Is this a forward or backward ACK? */
5020 id = GNUNET_PEER_search (peer);
5021 pid = ntohl (msg->pid);
5022 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " PID %u\n", pid);
5023 if (t->next_hop == id)
5025 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " from FWD\n");
5027 old = fc->last_pid_recv;
5029 else if (t->prev_hop == id)
5031 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " from BCK\n");
5033 old = fc->last_pid_recv;
5041 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " was %u\n", fc->last_pid_recv);
5042 fc->last_pid_recv = pid;
5043 tunnel_send_ack (t, GNUNET_MESSAGE_TYPE_MESH_POLL, t->prev_hop == id);
5045 if (GNUNET_YES == t->reliable)
5046 fc->last_pid_recv = old;
5053 * Core handler for mesh keepalives.
5055 * @param cls closure
5056 * @param message message
5057 * @param peer peer identity this notification is about
5058 * @return GNUNET_OK to keep the connection open,
5059 * GNUNET_SYSERR to close it (signal serious error)
5061 * TODO: Check who we got this from, to validate route.
5064 handle_mesh_keepalive (void *cls, const struct GNUNET_PeerIdentity *peer,
5065 const struct GNUNET_MessageHeader *message)
5067 struct GNUNET_MESH_TunnelKeepAlive *msg;
5068 struct MeshTunnel *t;
5069 struct MeshClient *c;
5073 msg = (struct GNUNET_MESH_TunnelKeepAlive *) message;
5074 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "got a keepalive packet from %s\n",
5077 t = channel_get (&msg->oid, ntohl (msg->tid));
5080 /* TODO notify that we dont know that tunnel */
5081 GNUNET_STATISTICS_update (stats, "# keepalive on unknown tunnel", 1,
5086 fwd = GNUNET_MESSAGE_TYPE_MESH_FWD_KEEPALIVE == ntohs (message->type) ?
5087 GNUNET_YES : GNUNET_NO;
5088 c = fwd ? t->client : t->owner;
5089 hop = fwd ? t->next_hop : t->prev_hop;
5092 tunnel_change_state (t, MESH_TUNNEL_READY);
5093 tunnel_reset_timeout (t, fwd);
5094 if (NULL != c || 0 == hop || myid == hop)
5097 GNUNET_STATISTICS_update (stats, "# keepalives forwarded", 1, GNUNET_NO);
5098 send_prebuilt_message (message, hop, t);
5105 * Functions to handle messages from core
5107 static struct GNUNET_CORE_MessageHandler core_handlers[] = {
5108 {&handle_mesh_connection_create, GNUNET_MESSAGE_TYPE_MESH_CONNECTION_CREATE,
5110 {&handle_mesh_connection_ack, GNUNET_MESSAGE_TYPE_MESH_CONNECTION_ACK,
5111 sizeof (struct GNUNET_MESH_ConnectionACK)},
5112 {&handle_mesh_connection_broken, GNUNET_MESSAGE_TYPE_MESH_CONNECTION_BROKEN,
5113 sizeof (struct GNUNET_MESH_ConnectionBroken)},
5114 {&handle_mesh_connection_destroy, GNUNET_MESSAGE_TYPE_MESH_CONNECTION_DESTROY,
5115 sizeof (struct GNUNET_MESH_ConnectionDestroy)},
5116 {&handle_mesh_fwd, GNUNET_MESSAGE_TYPE_MESH_FWD, 0},
5117 {&handle_mesh_bck, GNUNET_MESSAGE_TYPE_MESH_BCK, 0},
5118 {&handle_mesh_keepalive, GNUNET_MESSAGE_TYPE_MESH_FWD_KEEPALIVE,
5119 sizeof (struct GNUNET_MESH_TunnelKeepAlive)},
5120 {&handle_mesh_keepalive, GNUNET_MESSAGE_TYPE_MESH_BCK_KEEPALIVE,
5121 sizeof (struct GNUNET_MESH_TunnelKeepAlive)},
5122 {&handle_mesh_ack, GNUNET_MESSAGE_TYPE_MESH_ACK,
5123 sizeof (struct GNUNET_MESH_ACK)},
5124 {&handle_mesh_poll, GNUNET_MESSAGE_TYPE_MESH_POLL,
5125 sizeof (struct GNUNET_MESH_Poll)},
5131 * Function to process paths received for a new peer addition. The recorded
5132 * paths form the initial tunnel, which can be optimized later.
5133 * Called on each result obtained for the DHT search.
5135 * @param cls closure
5136 * @param exp when will this value expire
5137 * @param key key of the result
5138 * @param get_path path of the get request
5139 * @param get_path_length lenght of get_path
5140 * @param put_path path of the put request
5141 * @param put_path_length length of the put_path
5142 * @param type type of the result
5143 * @param size number of bytes in data
5144 * @param data pointer to the result data
5147 dht_get_id_handler (void *cls, struct GNUNET_TIME_Absolute exp,
5148 const struct GNUNET_HashCode * key,
5149 const struct GNUNET_PeerIdentity *get_path,
5150 unsigned int get_path_length,
5151 const struct GNUNET_PeerIdentity *put_path,
5152 unsigned int put_path_length, enum GNUNET_BLOCK_Type type,
5153 size_t size, const void *data)
5155 struct MeshPeer *peer = cls;
5156 struct MeshPeerPath *p;
5157 struct MeshConnection *c;
5158 struct GNUNET_PeerIdentity pi;
5161 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got results from DHT!\n");
5162 GNUNET_PEER_resolve (peer->id, &pi);
5163 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " for %s\n", GNUNET_i2s (&pi));
5165 p = path_build_from_dht (get_path, get_path_length,
5166 put_path, put_path_length);
5167 path_add_to_peers (p, GNUNET_NO);
5170 /* Count connections */
5171 for (c = peer->tunnel->connection_head, i = 0; NULL != c; c = c->next, i++);
5173 /* If we already have 3 (or more (?!)) connections, it's enough */
5177 if (peer->tunnel->state == MESH_TUNNEL_SEARCHING)
5179 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ... connect!\n");
5180 peer_connect (peer);
5186 /******************************************************************************/
5187 /********************* MESH LOCAL HANDLES **************************/
5188 /******************************************************************************/
5192 * Handler for client connection.
5194 * @param cls Closure (unused).
5195 * @param client Client handler.
5198 handle_local_client_connect (void *cls, struct GNUNET_SERVER_Client *client)
5200 struct MeshClient *c;
5204 c = GNUNET_malloc (sizeof (struct MeshClient));
5206 GNUNET_SERVER_client_keep (client);
5207 GNUNET_SERVER_client_set_user_context (client, c);
5208 GNUNET_CONTAINER_DLL_insert (clients_head, clients_tail, c);
5213 * Handler for client disconnection
5215 * @param cls closure
5216 * @param client identification of the client; NULL
5217 * for the last call when the server is destroyed
5220 handle_local_client_disconnect (void *cls, struct GNUNET_SERVER_Client *client)
5222 struct MeshClient *c;
5223 struct MeshClient *next;
5225 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "client disconnected: %p\n", client);
5228 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " (SERVER DOWN)\n");
5232 c = client_get (client);
5235 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "matching client found (%u, %p)\n",
5237 GNUNET_SERVER_client_drop (c->handle);
5238 c->shutting_down = GNUNET_YES;
5239 if (NULL != c->own_tunnels)
5241 GNUNET_CONTAINER_multihashmap32_iterate (c->own_tunnels,
5242 &tunnel_destroy_iterator, c);
5243 GNUNET_CONTAINER_multihashmap32_destroy (c->own_tunnels);
5246 if (NULL != c->incoming_tunnels)
5248 GNUNET_CONTAINER_multihashmap32_iterate (c->incoming_tunnels,
5249 &tunnel_destroy_iterator, c);
5250 GNUNET_CONTAINER_multihashmap32_destroy (c->incoming_tunnels);
5253 if (NULL != c->ports)
5255 GNUNET_CONTAINER_multihashmap32_iterate (c->ports,
5256 &client_release_ports, c);
5257 GNUNET_CONTAINER_multihashmap32_destroy (c->ports);
5260 GNUNET_CONTAINER_DLL_remove (clients_head, clients_tail, c);
5261 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " client free (%p)\n", c);
5263 GNUNET_STATISTICS_update (stats, "# clients", -1, GNUNET_NO);
5268 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, " context NULL!\n");
5270 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "done!\n");
5276 * Handler for new clients
5278 * @param cls closure
5279 * @param client identification of the client
5280 * @param message the actual message, which includes messages the client wants
5283 handle_local_new_client (void *cls, struct GNUNET_SERVER_Client *client,
5284 const struct GNUNET_MessageHeader *message)
5286 struct GNUNET_MESH_ClientConnect *cc_msg;
5287 struct MeshClient *c;
5292 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "new client connected %p\n", client);
5294 /* Check data sanity */
5295 size = ntohs (message->size) - sizeof (struct GNUNET_MESH_ClientConnect);
5296 cc_msg = (struct GNUNET_MESH_ClientConnect *) message;
5297 if (0 != (size % sizeof (uint32_t)))
5300 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
5303 size /= sizeof (uint32_t);
5305 /* Initialize new client structure */
5306 c = GNUNET_SERVER_client_get_user_context (client, struct MeshClient);
5307 c->id = next_client_id++; /* overflow not important: just for debug */
5308 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " client id %u\n", c->id);
5309 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " client has %u ports\n", size);
5314 p = (uint32_t *) &cc_msg[1];
5315 c->ports = GNUNET_CONTAINER_multihashmap32_create (size);
5316 for (i = 0; i < size; i++)
5319 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " port: %u\n", u32);
5321 /* store in client's hashmap */
5322 GNUNET_CONTAINER_multihashmap32_put (c->ports, u32, c,
5323 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST);
5324 /* store in global hashmap */
5325 /* FIXME only allow one client to have the port open,
5326 * have a backup hashmap with waiting clients */
5327 GNUNET_CONTAINER_multihashmap32_put (ports, u32, c,
5328 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
5332 c->own_channels = GNUNET_CONTAINER_multihashmap32_create (32);
5333 c->incoming_channels = GNUNET_CONTAINER_multihashmap32_create (32);
5334 GNUNET_SERVER_notification_context_add (nc, client);
5335 GNUNET_STATISTICS_update (stats, "# clients", 1, GNUNET_NO);
5337 GNUNET_SERVER_receive_done (client, GNUNET_OK);
5338 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "new client processed\n");
5343 * Handler for requests of new tunnels
5345 * @param cls Closure.
5346 * @param client Identification of the client.
5347 * @param message The actual message.
5350 handle_local_channel_create (void *cls, struct GNUNET_SERVER_Client *client,
5351 const struct GNUNET_MessageHeader *message)
5353 struct GNUNET_MESH_ChannelMessage *msg;
5354 struct MeshPeer *peer;
5355 struct MeshTunnel2 *t;
5356 struct MeshChannel *ch;
5357 struct MeshClient *c;
5358 MESH_ChannelNumber chid;
5360 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "new channel requested\n");
5362 /* Sanity check for client registration */
5363 if (NULL == (c = client_get (client)))
5366 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
5369 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
5371 /* Message size sanity check */
5372 if (sizeof (struct GNUNET_MESH_ChannelMessage) != ntohs (message->size))
5375 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
5379 msg = (struct GNUNET_MESH_ChannelMessage *) message;
5380 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " towards %s:%u\n",
5381 GNUNET_i2s (&msg->peer), ntohl (msg->port));
5382 chid = ntohl (msg->channel_id);
5384 /* Sanity check for duplicate tunnel IDs */
5385 if (NULL != channel_get_by_local_id (c, chid))
5388 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
5392 peer = peer_get (&msg->peer);
5393 if (NULL == peer->tunnel)
5394 peer->tunnel = tunnel_new ();
5397 /* Create channel */
5398 while (NULL != channel_get_by_pi (myid, next_tid))
5399 next_tid = (next_tid + 1) & ~GNUNET_MESH_LOCAL_CHANNEL_ID_CLI;
5400 t = tunnel_new (myid, next_tid, c, chid);
5401 next_tid = (next_tid + 1) & ~GNUNET_MESH_LOCAL_CHANNEL_ID_CLI;
5405 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
5408 t->port = ntohl (msg->port);
5409 tunnel_set_options (t, ntohl (msg->opt));
5410 if (GNUNET_YES == t->reliable)
5412 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! Reliable\n");
5413 t->fwd_rel = GNUNET_malloc (sizeof (struct MeshChannelReliability));
5415 t->fwd_rel->expected_delay = MESH_RETRANSMIT_TIME;
5418 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "CREATED TUNNEL %s[%x]:%u (%x)\n",
5419 GNUNET_i2s (&my_full_id), t->id.tid, t->port, t->local_tid);
5421 peer_info = peer_get (&msg->peer);
5422 peer_add_tunnel (peer_info, t);
5423 peer_connect (peer_info, t);
5424 tunnel_reset_timeout (t, GNUNET_YES);
5425 GNUNET_SERVER_receive_done (client, GNUNET_OK);
5431 * Handler for requests of deleting tunnels
5433 * @param cls closure
5434 * @param client identification of the client
5435 * @param message the actual message
5438 handle_local_channel_destroy (void *cls, struct GNUNET_SERVER_Client *client,
5439 const struct GNUNET_MessageHeader *message)
5441 struct GNUNET_MESH_ChannelMessage *tunnel_msg;
5442 struct MeshClient *c;
5443 struct MeshTunnel *t;
5444 MESH_ChannelNumber tid;
5446 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5447 "Got a DESTROY TUNNEL from client!\n");
5449 /* Sanity check for client registration */
5450 if (NULL == (c = client_get (client)))
5453 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
5456 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
5458 /* Message sanity check */
5459 if (sizeof (struct GNUNET_MESH_ChannelMessage) != ntohs (message->size))
5462 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
5466 tunnel_msg = (struct GNUNET_MESH_ChannelMessage *) message;
5468 /* Retrieve tunnel */
5469 tid = ntohl (tunnel_msg->channel_id);
5470 t = channel_get_by_local_id (c, tid);
5473 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, " tunnel %X not found\n", tid);
5475 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
5479 /* Cleanup after the tunnel */
5480 client_delete_tunnel (c, t);
5481 if (c == t->client && GNUNET_MESH_LOCAL_CHANNEL_ID_SERV <= tid)
5485 else if (c == t->owner && GNUNET_MESH_LOCAL_CHANNEL_ID_SERV > tid)
5487 peer_remove_tunnel (peer_get_short (t->dest), t);
5492 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5493 " tunnel %X client %p (%p, %p)\n",
5494 tid, c, t->owner, t->client);
5498 /* The tunnel will be destroyed when the last message is transmitted. */
5499 tunnel_destroy_empty (t);
5501 GNUNET_SERVER_receive_done (client, GNUNET_OK);
5507 * Handler for client traffic
5509 * @param cls closure
5510 * @param client identification of the client
5511 * @param message the actual message
5514 handle_local_data (void *cls, struct GNUNET_SERVER_Client *client,
5515 const struct GNUNET_MessageHeader *message)
5517 struct GNUNET_MESH_LocalData *data_msg;
5518 struct MeshClient *c;
5519 struct MeshTunnel *t;
5520 struct MeshFlowControl *fc;
5521 MESH_ChannelNumber tid;
5524 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5525 "Got data from a client!\n");
5527 /* Sanity check for client registration */
5528 if (NULL == (c = client_get (client)))
5531 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
5534 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
5536 data_msg = (struct GNUNET_MESH_LocalData *) message;
5538 /* Sanity check for message size */
5539 size = ntohs (message->size) - sizeof (struct GNUNET_MESH_LocalData);
5540 if (size < sizeof (struct GNUNET_MessageHeader))
5543 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
5547 /* Tunnel exists? */
5548 tid = ntohl (data_msg->tid);
5549 t = channel_get_by_local_id (c, tid);
5553 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
5557 /* Is the client in the tunnel? */
5558 if ( !( (tid < GNUNET_MESH_LOCAL_CHANNEL_ID_SERV &&
5560 t->owner->handle == client)
5562 (tid >= GNUNET_MESH_LOCAL_CHANNEL_ID_SERV &&
5564 t->client->handle == client) ) )
5567 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
5571 /* Ok, everything is correct, send the message
5572 * (pretend we got it from a mesh peer)
5575 struct GNUNET_MESH_Data *payload;
5576 char cbuf[sizeof(struct GNUNET_MESH_Data) + size];
5578 fc = tid < GNUNET_MESH_LOCAL_CHANNEL_ID_SERV ? &t->prev_fc : &t->next_fc;
5579 if (GNUNET_YES == t->reliable)
5581 struct MeshChannelReliability *rel;
5582 struct MeshReliableMessage *copy;
5584 rel = (tid < GNUNET_MESH_LOCAL_CHANNEL_ID_SERV) ? t->fwd_rel : t->bck_rel;
5585 copy = GNUNET_malloc (sizeof (struct MeshReliableMessage)
5586 + sizeof(struct GNUNET_MESH_Data)
5588 copy->mid = rel->mid_sent++;
5589 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! DATA %u\n", copy->mid);
5590 copy->timestamp = GNUNET_TIME_absolute_get ();
5593 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " n_sent %u\n", rel->n_sent);
5594 GNUNET_CONTAINER_DLL_insert_tail (rel->head_sent, rel->tail_sent, copy);
5595 if (GNUNET_SCHEDULER_NO_TASK == rel->retry_task)
5598 GNUNET_TIME_relative_multiply (rel->expected_delay,
5599 MESH_RETRANSMIT_MARGIN);
5601 GNUNET_SCHEDULER_add_delayed (rel->retry_timer,
5602 &tunnel_retransmit_message,
5605 payload = (struct GNUNET_MESH_Data *) ©[1];
5606 payload->mid = htonl (copy->mid);
5610 payload = (struct GNUNET_MESH_Data *) cbuf;
5611 payload->mid = htonl (fc->last_pid_recv + 1);
5613 memcpy (&payload[1], &data_msg[1], size);
5614 payload->header.size = htons (sizeof (struct GNUNET_MESH_Data) + size);
5615 payload->header.type = htons (tid < GNUNET_MESH_LOCAL_CHANNEL_ID_SERV ?
5616 GNUNET_MESSAGE_TYPE_MESH_UNICAST :
5617 GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN);
5618 GNUNET_PEER_resolve(t->id.oid, &payload->oid);;
5619 payload->tid = htonl (t->id.tid);
5620 payload->ttl = htonl (default_ttl);
5621 payload->pid = htonl (fc->last_pid_recv + 1);
5622 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5623 " calling generic handler...\n");
5624 if (tid < GNUNET_MESH_LOCAL_CHANNEL_ID_SERV)
5625 handle_mesh_unicast (NULL, &my_full_id, &payload->header);
5627 handle_mesh_to_orig (NULL, &my_full_id, &payload->header);
5629 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "receive done OK\n");
5630 GNUNET_SERVER_receive_done (client, GNUNET_OK);
5637 * Handler for client's ACKs for payload traffic.
5639 * @param cls Closure (unused).
5640 * @param client Identification of the client.
5641 * @param message The actual message.
5644 handle_local_ack (void *cls, struct GNUNET_SERVER_Client *client,
5645 const struct GNUNET_MessageHeader *message)
5647 struct GNUNET_MESH_LocalAck *msg;
5648 struct MeshTunnel *t;
5649 struct MeshClient *c;
5650 MESH_ChannelNumber tid;
5652 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got a local ACK\n");
5653 /* Sanity check for client registration */
5654 if (NULL == (c = client_get (client)))
5657 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
5660 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
5662 msg = (struct GNUNET_MESH_LocalAck *) message;
5664 /* Tunnel exists? */
5665 tid = ntohl (msg->channel_id);
5666 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " on tunnel %X\n", tid);
5667 t = channel_get_by_local_id (c, tid);
5671 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Tunnel %X unknown.\n", tid);
5672 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, " for client %u.\n", c->id);
5673 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
5677 /* Does client own tunnel? I.E: Is this an ACK for BCK traffic? */
5678 if (tid < GNUNET_MESH_LOCAL_CHANNEL_ID_SERV)
5680 /* The client owns the tunnel, ACK is for data to_origin, send BCK ACK. */
5681 t->prev_fc.last_ack_recv++;
5682 tunnel_send_ack (t, GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK, GNUNET_NO);
5686 /* The client doesn't own the tunnel, this ACK is for FWD traffic. */
5687 t->next_fc.last_ack_recv++;
5688 tunnel_send_ack (t, GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK, GNUNET_YES);
5691 GNUNET_SERVER_receive_done (client, GNUNET_OK);
5699 * Iterator over all tunnels to send a monitoring client info about each tunnel.
5701 * @param cls Closure (client handle).
5702 * @param key Key (hashed tunnel ID, unused).
5703 * @param value Tunnel info.
5705 * @return GNUNET_YES, to keep iterating.
5708 monitor_all_tunnels_iterator (void *cls,
5709 const struct GNUNET_HashCode * key,
5712 struct GNUNET_SERVER_Client *client = cls;
5713 struct MeshChannel *ch = value;
5714 struct GNUNET_MESH_LocalMonitor *msg;
5716 msg = GNUNET_malloc (sizeof(struct GNUNET_MESH_LocalMonitor));
5717 msg->channel_id = htonl (ch->id);
5718 msg->header.size = htons (sizeof (struct GNUNET_MESH_LocalMonitor));
5719 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_TUNNELS);
5721 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
5722 "* sending info about tunnel %s\n",
5723 GNUNET_i2s (&msg->owner));
5725 GNUNET_SERVER_notification_context_unicast (nc, client,
5726 &msg->header, GNUNET_NO);
5732 * Handler for client's MONITOR request.
5734 * @param cls Closure (unused).
5735 * @param client Identification of the client.
5736 * @param message The actual message.
5739 handle_local_get_tunnels (void *cls, struct GNUNET_SERVER_Client *client,
5740 const struct GNUNET_MessageHeader *message)
5742 struct MeshClient *c;
5744 /* Sanity check for client registration */
5745 if (NULL == (c = client_get (client)))
5748 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
5752 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
5753 "Received get tunnels request from client %u\n",
5755 GNUNET_CONTAINER_multihashmap_iterate (tunnels,
5756 monitor_all_tunnels_iterator,
5758 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
5759 "Get tunnels request from client %u completed\n",
5761 GNUNET_SERVER_receive_done (client, GNUNET_OK);
5766 * Handler for client's MONITOR_TUNNEL request.
5768 * @param cls Closure (unused).
5769 * @param client Identification of the client.
5770 * @param message The actual message.
5773 handle_local_show_tunnel (void *cls, struct GNUNET_SERVER_Client *client,
5774 const struct GNUNET_MessageHeader *message)
5776 const struct GNUNET_MESH_LocalMonitor *msg;
5777 struct GNUNET_MESH_LocalMonitor *resp;
5778 struct MeshClient *c;
5779 struct MeshChannel *ch;
5781 /* Sanity check for client registration */
5782 if (NULL == (c = client_get (client)))
5785 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
5789 msg = (struct GNUNET_MESH_LocalMonitor *) message;
5790 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
5791 "Received tunnel info request from client %u for tunnel %s[%X]\n",
5794 ntohl (msg->channel_id));
5795 ch = channel_get (&msg->owner, ntohl (msg->channel_id));
5798 /* We don't know the tunnel */
5799 struct GNUNET_MESH_LocalMonitor warn;
5802 GNUNET_SERVER_notification_context_unicast (nc, client,
5805 GNUNET_SERVER_receive_done (client, GNUNET_OK);
5809 /* Initialize context */
5810 resp = GNUNET_malloc (sizeof (struct GNUNET_MESH_LocalMonitor));
5812 resp->header.size = htons (sizeof (struct GNUNET_MESH_LocalMonitor));
5813 GNUNET_SERVER_notification_context_unicast (nc, c->handle,
5814 &resp->header, GNUNET_NO);
5817 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
5818 "Monitor tunnel request from client %u completed\n",
5820 GNUNET_SERVER_receive_done (client, GNUNET_OK);
5825 * Functions to handle messages from clients
5827 static struct GNUNET_SERVER_MessageHandler client_handlers[] = {
5828 {&handle_local_new_client, NULL,
5829 GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT, 0},
5830 {&handle_local_channel_create, NULL,
5831 GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE,
5832 sizeof (struct GNUNET_MESH_ChannelMessage)},
5833 {&handle_local_channel_destroy, NULL,
5834 GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY,
5835 sizeof (struct GNUNET_MESH_ChannelMessage)},
5836 {&handle_local_data, NULL,
5837 GNUNET_MESSAGE_TYPE_MESH_LOCAL_DATA, 0},
5838 {&handle_local_ack, NULL,
5839 GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK,
5840 sizeof (struct GNUNET_MESH_LocalAck)},
5841 {&handle_local_get_tunnels, NULL,
5842 GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_TUNNELS,
5843 sizeof (struct GNUNET_MessageHeader)},
5844 {&handle_local_show_tunnel, NULL,
5845 GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_TUNNEL,
5846 sizeof (struct GNUNET_MESH_LocalMonitor)},
5852 * Method called whenever a given peer connects.
5854 * @param cls closure
5855 * @param peer peer identity this notification is about
5858 core_connect (void *cls, const struct GNUNET_PeerIdentity *peer)
5860 struct MeshPeer *peer_info;
5861 struct MeshPeerPath *path;
5863 DEBUG_CONN ("Peer connected\n");
5864 DEBUG_CONN (" %s\n", GNUNET_i2s (&my_full_id));
5865 peer_info = peer_get (peer);
5866 if (myid == peer_info->id)
5868 DEBUG_CONN (" (self)\n");
5869 path = path_new (1);
5873 DEBUG_CONN (" %s\n", GNUNET_i2s (peer));
5874 path = path_new (2);
5875 path->peers[1] = peer_info->id;
5876 GNUNET_PEER_change_rc (peer_info->id, 1);
5877 GNUNET_STATISTICS_update (stats, "# peers", 1, GNUNET_NO);
5879 path->peers[0] = myid;
5880 GNUNET_PEER_change_rc (myid, 1);
5881 peer_add_path (peer_info, path, GNUNET_YES);
5882 if (NULL == peer_info->fc)
5884 peer_info->fc = GNUNET_new (struct MeshFlowControl);
5885 fc_init (peer_info->fc);
5886 peer_info->fc->peer = peer_info;
5893 * Method called whenever a peer disconnects.
5895 * @param cls closure
5896 * @param peer peer identity this notification is about
5899 core_disconnect (void *cls, const struct GNUNET_PeerIdentity *peer)
5901 struct MeshPeer *pi;
5902 struct MeshPeerQueue *q;
5903 struct MeshPeerQueue *n;
5904 struct MeshFlowControl *fc;
5906 DEBUG_CONN ("Peer disconnected\n");
5907 pi = GNUNET_CONTAINER_multihashmap_get (peers, &peer->hashPubKey);
5925 queue_destroy (q, GNUNET_YES);
5928 if (NULL != fc->core_transmit)
5929 GNUNET_CORE_notify_transmit_ready_cancel (fc->core_transmit);
5930 if (GNUNET_SCHEDULER_NO_TASK != fc->poll_task)
5931 GNUNET_SCHEDULER_cancel (fc->poll_task);
5933 peer_remove_path (pi, pi->id, myid);
5936 DEBUG_CONN (" (self)\n");
5938 GNUNET_STATISTICS_update (stats, "# peers", -1, GNUNET_NO);
5946 * Install server (service) handlers and start listening to clients.
5951 GNUNET_SERVER_add_handlers (server_handle, client_handlers);
5952 GNUNET_SERVER_connect_notify (server_handle,
5953 &handle_local_client_connect, NULL);
5954 GNUNET_SERVER_disconnect_notify (server_handle,
5955 &handle_local_client_disconnect, NULL);
5956 nc = GNUNET_SERVER_notification_context_create (server_handle, 1);
5958 clients_head = NULL;
5959 clients_tail = NULL;
5961 GNUNET_SERVER_resume (server_handle);
5966 * To be called on core init/fail.
5968 * @param cls Closure (config)
5969 * @param server handle to the server for this service
5970 * @param identity the public identity of this peer
5973 core_init (void *cls, struct GNUNET_CORE_Handle *server,
5974 const struct GNUNET_PeerIdentity *identity)
5976 const struct GNUNET_CONFIGURATION_Handle *c = cls;
5979 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Core init\n");
5980 GNUNET_break (core_handle == server);
5981 if (0 != memcmp (identity, &my_full_id, sizeof (my_full_id)) ||
5984 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, _("Wrong CORE service\n"));
5985 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5987 GNUNET_i2s (identity));
5988 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5990 GNUNET_i2s (&my_full_id));
5991 GNUNET_CORE_disconnect (core_handle);
5992 core_handle = GNUNET_CORE_connect (c, /* Main configuration */
5993 NULL, /* Closure passed to MESH functions */
5994 &core_init, /* Call core_init once connected */
5995 &core_connect, /* Handle connects */
5996 &core_disconnect, /* remove peers on disconnects */
5997 NULL, /* Don't notify about all incoming messages */
5998 GNUNET_NO, /* For header only in notification */
5999 NULL, /* Don't notify about all outbound messages */
6000 GNUNET_NO, /* For header-only out notification */
6001 core_handlers); /* Register these handlers */
6010 /******************************************************************************/
6011 /************************ MAIN FUNCTIONS ****************************/
6012 /******************************************************************************/
6015 * Iterator over tunnel hash map entries to destroy the tunnel during shutdown.
6017 * @param cls closure
6018 * @param key current key code
6019 * @param value value in the hash map
6020 * @return GNUNET_YES if we should continue to iterate,
6024 shutdown_tunnel (void *cls, const struct GNUNET_HashCode * key, void *value)
6026 struct MeshTunnel2 *t = value;
6033 * Iterator over peer hash map entries to destroy the tunnel during shutdown.
6035 * @param cls closure
6036 * @param key current key code
6037 * @param value value in the hash map
6038 * @return GNUNET_YES if we should continue to iterate,
6042 shutdown_peer (void *cls, const struct GNUNET_HashCode * key, void *value)
6044 struct MeshPeer *p = value;
6045 struct MeshPeerQueue *q;
6046 struct MeshPeerQueue *n;
6048 q = p->fc->queue_head;
6054 queue_destroy(q, GNUNET_YES);
6064 * Task run during shutdown.
6070 shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
6072 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "shutting down\n");
6074 if (core_handle != NULL)
6076 GNUNET_CORE_disconnect (core_handle);
6079 GNUNET_CONTAINER_multihashmap_iterate (tunnels, &shutdown_tunnel, NULL);
6080 GNUNET_CONTAINER_multihashmap_iterate (peers, &shutdown_peer, NULL);
6081 if (dht_handle != NULL)
6083 GNUNET_DHT_disconnect (dht_handle);
6088 GNUNET_SERVER_notification_context_destroy (nc);
6091 if (GNUNET_SCHEDULER_NO_TASK != announce_id_task)
6093 GNUNET_SCHEDULER_cancel (announce_id_task);
6094 announce_id_task = GNUNET_SCHEDULER_NO_TASK;
6096 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "shut down\n");
6101 * Process mesh requests.
6103 * @param cls closure
6104 * @param server the initialized server
6105 * @param c configuration to use
6108 run (void *cls, struct GNUNET_SERVER_Handle *server,
6109 const struct GNUNET_CONFIGURATION_Handle *c)
6112 struct GNUNET_CRYPTO_EccPrivateKey *pk;
6114 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "starting to run\n");
6115 server_handle = server;
6116 GNUNET_SERVER_suspend (server_handle);
6119 GNUNET_CONFIGURATION_get_value_filename (c, "PEER", "PRIVATE_KEY",
6122 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
6124 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
6125 "mesh", "peer/privatekey");
6126 GNUNET_SCHEDULER_shutdown ();
6131 GNUNET_CONFIGURATION_get_value_time (c, "MESH", "REFRESH_CONNECTION_TIME",
6132 &refresh_connection_time))
6134 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
6136 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
6137 "mesh", "refresh path time");
6138 GNUNET_SCHEDULER_shutdown ();
6143 GNUNET_CONFIGURATION_get_value_time (c, "MESH", "ID_ANNOUNCE_TIME",
6146 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
6148 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
6149 "mesh", "id announce time");
6150 GNUNET_SCHEDULER_shutdown ();
6155 GNUNET_CONFIGURATION_get_value_time (c, "MESH", "CONNECT_TIMEOUT",
6158 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
6160 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
6161 "mesh", "connect timeout");
6162 GNUNET_SCHEDULER_shutdown ();
6167 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "MAX_MSGS_QUEUE",
6170 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
6172 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
6173 "mesh", "max msgs queue");
6174 GNUNET_SCHEDULER_shutdown ();
6179 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "MAX_TUNNELS",
6182 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
6184 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
6185 "mesh", "max tunnels");
6186 GNUNET_SCHEDULER_shutdown ();
6191 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "DEFAULT_TTL",
6194 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
6196 ("%s service is lacking key configuration settings (%s). Using default (%u).\n"),
6197 "mesh", "default ttl", 64);
6202 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "MAX_PEERS",
6205 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
6206 _("%s service is lacking key configuration settings (%s). Using default (%u).\n"),
6207 "mesh", "max peers", 1000);
6212 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "DROP_PERCENT",
6219 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
6220 "Mesh is running with drop mode enabled. "
6221 "This is NOT a good idea! "
6222 "Remove the DROP_PERCENT option from your configuration.\n");
6226 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "DHT_REPLICATION_LEVEL",
6227 &dht_replication_level))
6229 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
6231 ("%s service is lacking key configuration settings (%s). Using default (%u).\n"),
6232 "mesh", "dht replication level", 3);
6233 dht_replication_level = 3;
6236 tunnels = GNUNET_CONTAINER_multihashmap_create (32, GNUNET_NO);
6237 peers = GNUNET_CONTAINER_multihashmap_create (32, GNUNET_NO);
6238 ports = GNUNET_CONTAINER_multihashmap32_create (32);
6240 dht_handle = GNUNET_DHT_connect (c, 64);
6241 if (NULL == dht_handle)
6245 stats = GNUNET_STATISTICS_create ("mesh", c);
6247 /* Scheduled the task to clean up when shutdown is called */
6248 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &shutdown_task,
6250 pk = GNUNET_CRYPTO_ecc_key_create_from_file (keyfile);
6251 GNUNET_free (keyfile);
6252 GNUNET_assert (NULL != pk);
6253 my_private_key = pk;
6254 GNUNET_CRYPTO_ecc_key_get_public (my_private_key, &my_public_key);
6255 GNUNET_CRYPTO_hash (&my_public_key, sizeof (my_public_key),
6256 &my_full_id.hashPubKey);
6257 myid = GNUNET_PEER_intern (&my_full_id);
6258 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
6259 "Mesh for peer [%s] starting\n",
6260 GNUNET_i2s(&my_full_id));
6262 core_handle = GNUNET_CORE_connect (c, /* Main configuration */
6263 NULL, /* Closure passed to MESH functions */
6264 &core_init, /* Call core_init once connected */
6265 &core_connect, /* Handle connects */
6266 &core_disconnect, /* remove peers on disconnects */
6267 NULL, /* Don't notify about all incoming messages */
6268 GNUNET_NO, /* For header only in notification */
6269 NULL, /* Don't notify about all outbound messages */
6270 GNUNET_NO, /* For header-only out notification */
6271 core_handlers); /* Register these handlers */
6272 if (NULL == core_handle)
6275 GNUNET_SCHEDULER_shutdown ();
6278 announce_id_task = GNUNET_SCHEDULER_add_now (&announce_id, cls);
6279 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Mesh service running\n");
6284 * The main function for the mesh service.
6286 * @param argc number of arguments from the command line
6287 * @param argv command line arguments
6288 * @return 0 ok, 1 on error
6291 main (int argc, char *const *argv)
6296 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "main()\n");
6297 r = GNUNET_SERVICE_run (argc, argv, "mesh", GNUNET_SERVICE_OPTION_NONE, &run,
6299 ret = (GNUNET_OK == r) ? 0 : 1;
6300 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "main() END\n");