2 This file is part of GNUnet.
3 (C) 2001-2013 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
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11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
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17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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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
30 * - set connection IDs independently from tunnel, tunnel has no ID
33 * - relay corking down to core
34 * - set ttl relative to path length
38 * - peer: other mesh instance. If there is direct connection it's a neighbor.
39 * - tunnel: encrypted connection to a peer, neighbor or not.
40 * - channel: connection between two clients, on the same or different peers.
41 * have properties like reliability.
42 * - path: series of directly connected peer from one peer to another.
43 * - connection: path which is being used in a tunnel.
47 #include "gnunet_crypto_lib.h"
49 #include "mesh_protocol_enc.h"
50 #include "mesh_path.h"
51 #include "block_mesh.h"
52 #include "gnunet_dht_service.h"
53 #include "gnunet_statistics_service.h"
55 #define MESH_BLOOM_SIZE 128
57 #define MESH_DEBUG_DHT GNUNET_NO
58 #define MESH_DEBUG_CONNECTION GNUNET_YES
59 #define MESH_DEBUG_TIMING __LINUX__ && GNUNET_NO
61 #define MESH_MAX_POLL_TIME GNUNET_TIME_relative_multiply (\
62 GNUNET_TIME_UNIT_MINUTES,\
64 #define MESH_RETRANSMIT_TIME GNUNET_TIME_UNIT_SECONDS
65 #define MESH_RETRANSMIT_MARGIN 4
67 #if MESH_DEBUG_CONNECTION
68 #define DEBUG_CONN(...) GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, __VA_ARGS__)
70 #define DEBUG_CONN(...)
74 #define DEBUG_DHT(...) GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, __VA_ARGS__)
76 #define DEBUG_DHT(...)
83 struct timespec __mesh_start;
84 struct timespec __mesh_end;
85 #define INTERVAL_START clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &(__mesh_start))
86 #define INTERVAL_END \
88 clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &(__mesh_end));\
89 double __diff = __mesh_end.tv_nsec - __mesh_start.tv_nsec;\
90 if (__diff < 0) __diff += 1000000000;\
94 #define INTERVAL_SHOW \
96 GNUNET_log (GNUNET_ERROR_TYPE_INFO, "AVG process time: %f ns\n", __sum/__count)
98 #define INTERVAL_START
100 #define INTERVAL_SHOW
104 * All the states a tunnel can be in.
109 * Uninitialized status, should never appear in operation.
114 * Path to the peer not known yet
116 MESH_TUNNEL_SEARCHING,
119 * Request sent, not yet answered.
124 * Peer connected and ready to accept data
129 * Peer connected previosly but not responding
131 MESH_TUNNEL_RECONNECTING
136 * All the states a connection can be in.
138 enum MeshConnectionState
141 * Uninitialized status, should never appear in operation.
146 * Connection create message sent, waiting for ACK.
148 MESH_CONNECTION_SENT,
151 * Connection ACK sent, waiting for ACK.
156 * Connection confirmed, ready to carry traffic.
158 MESH_CONNECTION_READY,
163 * All the states a connection can be in.
165 enum MeshChannelState
168 * Uninitialized status, should never appear in operation.
173 * Connection create message sent, waiting for ACK.
178 * Connection confirmed, ready to carry traffic..
184 /******************************************************************************/
185 /************************ DATA STRUCTURES ****************************/
186 /******************************************************************************/
188 /** FWD declaration */
192 struct MeshConnection;
194 struct MeshChannelReliability;
198 * Struct containing info about a queued transmission to this peer
205 struct MeshPeerQueue *next;
210 struct MeshPeerQueue *prev;
213 * Peer this transmission is directed to.
215 struct MeshPeer *peer;
218 * Connection this message belongs to.
220 struct MeshConnection *c;
228 * Channel this message belongs to, if known.
230 struct MeshChannel *ch;
233 * Pointer to info stucture used as cls.
243 * Size of the message
250 * Struct to encapsulate all the Flow Control information to a peer to which
251 * we are directly connected (on a core level).
253 struct MeshFlowControl
256 * Connection this controls.
258 struct MeshConnection *c;
261 * How many messages are in the queue on this connection.
263 unsigned int queue_n;
266 * How many messages do we accept in the queue.
268 unsigned int queue_max;
276 * ID of the last packet sent towards the peer.
278 uint32_t last_pid_sent;
281 * ID of the last packet received from the peer.
283 uint32_t last_pid_recv;
286 * Last ACK sent to the peer (peer can't send more than this PID).
288 uint32_t last_ack_sent;
291 * Last ACK sent towards the origin (for traffic towards leaf node).
293 uint32_t last_ack_recv;
296 * Task to poll the peer in case of a lost ACK causes stall.
298 GNUNET_SCHEDULER_TaskIdentifier poll_task;
301 * How frequently to poll for ACKs.
303 struct GNUNET_TIME_Relative poll_time;
308 * Struct containing all information regarding a given peer
318 * Last time we heard from this peer
320 struct GNUNET_TIME_Absolute last_contact;
323 * Paths to reach the peer, ordered by ascending hop count
325 struct MeshPeerPath *path_head;
328 * Paths to reach the peer, ordered by ascending hop count
330 struct MeshPeerPath *path_tail;
333 * Handle to stop the DHT search for paths to this peer
335 struct GNUNET_DHT_GetHandle *dhtget;
338 * Tunnel to this peer, if any.
340 struct MeshTunnel2 *tunnel;
343 * Connections that go through this peer, indexed by tid;
345 struct GNUNET_CONTAINER_MultiHashMap *connections;
348 * Handle for queued transmissions
350 struct GNUNET_CORE_TransmitHandle *core_transmit;
353 * Transmission queue to core DLL head
355 struct MeshPeerQueue *queue_head;
358 * Transmission queue to core DLL tail
360 struct MeshPeerQueue *queue_tail;
363 * How many messages are in the queue to this peer.
365 unsigned int queue_n;
370 * Info needed to retry a message in case it gets lost.
372 struct MeshReliableMessage
375 * Double linked list, FIFO style
377 struct MeshReliableMessage *next;
378 struct MeshReliableMessage *prev;
381 * Type of message (payload, channel management).
386 * Tunnel Reliability queue this message is in.
388 struct MeshChannelReliability *rel;
391 * ID of the message (ACK needed to free)
396 * When was this message issued (to calculate ACK delay)
398 struct GNUNET_TIME_Absolute timestamp;
400 /* struct GNUNET_MESH_Data with payload */
405 * Info about the traffic state for a client in a channel.
407 struct MeshChannelReliability
410 * Channel this is about.
412 struct MeshChannel *ch;
415 * DLL of messages sent and not yet ACK'd.
417 struct MeshReliableMessage *head_sent;
418 struct MeshReliableMessage *tail_sent;
421 * Messages pending to send.
426 * DLL of messages received out of order.
428 struct MeshReliableMessage *head_recv;
429 struct MeshReliableMessage *tail_recv;
437 * Next MID to use for outgoing traffic.
442 * Next MID expected for incoming traffic.
447 * Can we send data to the client?
452 * Task to resend/poll in case no ACK is received.
454 GNUNET_SCHEDULER_TaskIdentifier retry_task;
457 * Counter for exponential backoff.
459 struct GNUNET_TIME_Relative retry_timer;
462 * How long does it usually take to get an ACK.
464 struct GNUNET_TIME_Relative expected_delay;
469 * Struct containing all information regarding a channel to a remote client.
474 * Tunnel this channel is in.
476 struct MeshTunnel2 *t;
479 * Double linked list.
481 struct MeshChannel *next;
482 struct MeshChannel *prev;
485 * Destination port of the channel.
490 * Global channel number ( < GNUNET_MESH_LOCAL_CHANNEL_ID_CLI)
492 MESH_ChannelNumber gid;
495 * Local tunnel number for root (owner) client.
496 * ( >= GNUNET_MESH_LOCAL_CHANNEL_ID_CLI or 0 )
498 MESH_ChannelNumber lid_root;
501 * Local tunnel number for local destination clients (incoming number)
502 * ( >= GNUNET_MESH_LOCAL_CHANNEL_ID_SERV or 0).
504 MESH_ChannelNumber lid_dest;
509 enum MeshChannelState state;
512 * Is the tunnel bufferless (minimum latency)?
517 * Is the tunnel reliable?
522 * Last time the channel was used
524 struct GNUNET_TIME_Absolute timestamp;
527 * Client owner of the tunnel, if any
529 struct MeshClient *root;
532 * Client destination of the tunnel, if any.
534 struct MeshClient *dest;
537 * Flag to signal the destruction of the channel.
538 * If this is set GNUNET_YES the channel will be destroyed
539 * when the queue is empty.
544 * Total messages pending for this channel, payload or not.
546 unsigned int pending_messages;
550 * Only present (non-NULL) at the owner of a tunnel.
552 struct MeshChannelReliability *root_rel;
556 * Only present (non-NULL) at the destination of a tunnel.
558 struct MeshChannelReliability *dest_rel;
564 * Struct containing all information regarding a connection to a peer.
566 struct MeshConnection
571 struct MeshConnection *next;
572 struct MeshConnection *prev;
575 * Tunnel this connection is part of.
577 struct MeshTunnel2 *t;
580 * Flow control information for traffic fwd.
582 struct MeshFlowControl fwd_fc;
585 * Flow control information for traffic bck.
587 struct MeshFlowControl bck_fc;
590 * ID of the connection.
592 struct GNUNET_HashCode id;
595 * State of the connection.
597 enum MeshConnectionState state;
600 * Path being used for the tunnel.
602 struct MeshPeerPath *path;
605 * Position of the local peer in the path.
607 unsigned int own_pos;
610 * Task to keep the used paths alive at the owner,
611 * time tunnel out on all the other peers.
613 GNUNET_SCHEDULER_TaskIdentifier fwd_maintenance_task;
616 * Task to keep the used paths alive at the destination,
617 * time tunnel out on all the other peers.
619 GNUNET_SCHEDULER_TaskIdentifier bck_maintenance_task;
622 * Pending message count.
624 int pending_messages;
627 * Destroy flag: if true, destroy on last message.
634 * Struct used to queue messages in a tunnel.
636 struct MeshTunnelQueue
641 struct MeshTunnelQueue *next;
642 struct MeshTunnelQueue *prev;
647 struct MeshChannel *ch;
652 /* struct GNUNET_MessageHeader *msg; */
657 * Struct containing all information regarding a tunnel to a peer.
662 * Endpoint of the tunnel.
664 struct MeshPeer *peer;
667 * State of the tunnel.
669 enum MeshTunnelState state;
672 * Local peer ephemeral private key
674 struct GNUNET_CRYPTO_EccPrivateKey *my_eph_key;
677 * Local peer ephemeral public key
679 struct GNUNET_CRYPTO_EccPublicKey *my_eph;
682 * Remote peer's public key.
684 struct GNUNET_CRYPTO_EccPublicKey *peers_eph;
687 * Encryption ("our") key.
689 struct GNUNET_CRYPTO_AesSessionKey e_key;
692 * Decryption ("their") key.
694 struct GNUNET_CRYPTO_AesSessionKey d_key;
697 * Paths that are actively used to reach the destination peer.
699 struct MeshConnection *connection_head;
700 struct MeshConnection *connection_tail;
703 * Next connection number.
708 * Channels inside this tunnel.
710 struct MeshChannel *channel_head;
711 struct MeshChannel *channel_tail;
714 * Channel ID for the next created channel.
716 MESH_ChannelNumber next_chid;
719 * Channel ID for the next incoming channel.
721 MESH_ChannelNumber next_local_chid;
724 * Pending message count.
726 int pending_messages;
729 * Destroy flag: if true, destroy on last message.
734 * Queued messages, to transmit once tunnel gets connected.
736 struct MeshTunnelQueue *tq_head;
737 struct MeshTunnelQueue *tq_tail;
743 * Struct containing information about a client of the service
745 * TODO: add a list of 'waiting' ports
752 struct MeshClient *next;
757 struct MeshClient *prev;
760 * Tunnels that belong to this client, indexed by local id
762 struct GNUNET_CONTAINER_MultiHashMap32 *own_channels;
765 * Tunnels this client has accepted, indexed by incoming local id
767 struct GNUNET_CONTAINER_MultiHashMap32 *incoming_channels;
770 * Handle to communicate with the client
772 struct GNUNET_SERVER_Client *handle;
775 * Ports that this client has declared interest in.
776 * Indexed by port, contains *Client.
778 struct GNUNET_CONTAINER_MultiHashMap32 *ports;
781 * Whether the client is active or shutting down (don't send confirmations
782 * to a client that is shutting down.
787 * ID of the client, mainly for debug messages
793 /******************************************************************************/
794 /************************ DEBUG FUNCTIONS ****************************/
795 /******************************************************************************/
799 * GNUNET_SCHEDULER_Task for printing a message after some operation is done
800 * @param cls string to print
801 * @param success GNUNET_OK if the PUT was transmitted,
802 * GNUNET_NO on timeout,
803 * GNUNET_SYSERR on disconnect from service
804 * after the PUT message was transmitted
805 * (so we don't know if it was received or not)
810 mesh_debug (void *cls, int success)
814 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "%s (%d)\n", s, success);
820 /******************************************************************************/
821 /*********************** GLOBAL VARIABLES ****************************/
822 /******************************************************************************/
824 /************************** Configuration parameters **************************/
827 * How often to send path keepalives. Paths timeout after 4 missed.
829 static struct GNUNET_TIME_Relative refresh_connection_time;
832 * How often to PUT own ID in the DHT.
834 static struct GNUNET_TIME_Relative id_announce_time;
837 * Maximum time allowed to connect to a peer found by string.
839 static struct GNUNET_TIME_Relative connect_timeout;
842 * Default TTL for payload packets.
844 static unsigned long long default_ttl;
847 * DHT replication level, see DHT API: GNUNET_DHT_get_start, GNUNET_DHT_put.
849 static unsigned long long dht_replication_level;
852 * How many connections are we willing to maintain.
853 * Local connections are always allowed, even if there are more connections than max.
855 static unsigned long long max_connections;
858 * How many messages *in total* are we willing to queue, divide by number of
859 * connections to get connection queue size.
861 static unsigned long long max_msgs_queue;
864 * How many peers do we want to remember?
866 static unsigned long long max_peers;
869 * Percentage of messages that will be dropped (for test purposes only).
871 static unsigned long long drop_percent;
873 /*************************** Static global variables **************************/
876 * DLL with all the clients, head.
878 static struct MeshClient *clients_head;
881 * DLL with all the clients, tail.
883 static struct MeshClient *clients_tail;
886 * Connections known, indexed by cid (MeshConnection).
888 static struct GNUNET_CONTAINER_MultiHashMap *connections;
891 * Peers known, indexed by PeerIdentity (MeshPeer).
893 static struct GNUNET_CONTAINER_MultiHashMap *peers;
896 * Handle to communicate with core.
898 static struct GNUNET_CORE_Handle *core_handle;
903 static struct GNUNET_DHT_Handle *dht_handle;
906 * Handle to server lib.
908 static struct GNUNET_SERVER_Handle *server_handle;
911 * Handle to the statistics service.
913 static struct GNUNET_STATISTICS_Handle *stats;
916 * Notification context, to send messages to local clients.
918 static struct GNUNET_SERVER_NotificationContext *nc;
921 * Local peer own ID (memory efficient handle).
923 static GNUNET_PEER_Id myid;
926 * Local peer own ID (full value).
928 static struct GNUNET_PeerIdentity my_full_id;
933 static struct GNUNET_CRYPTO_EccPrivateKey *my_private_key;
938 static struct GNUNET_CRYPTO_EccPublicKey my_public_key;
941 * All ports clients of this peer have opened.
943 static struct GNUNET_CONTAINER_MultiHashMap32 *ports;
946 * Task to periodically announce itself in the network.
948 GNUNET_SCHEDULER_TaskIdentifier announce_id_task;
951 * Next ID to assign to a client.
953 unsigned int next_client_id;
956 /******************************************************************************/
957 /*********************** DECLARATIONS **************************/
958 /******************************************************************************/
961 * Function to process paths received for a new peer addition. The recorded
962 * paths form the initial tunnel, which can be optimized later.
963 * Called on each result obtained for the DHT search.
966 * @param exp when will this value expire
967 * @param key key of the result
968 * @param type type of the result
969 * @param size number of bytes in data
970 * @param data pointer to the result data
973 dht_get_id_handler (void *cls, struct GNUNET_TIME_Absolute exp,
974 const struct GNUNET_HashCode * key,
975 const struct GNUNET_PeerIdentity *get_path,
976 unsigned int get_path_length,
977 const struct GNUNET_PeerIdentity *put_path,
978 unsigned int put_path_length, enum GNUNET_BLOCK_Type type,
979 size_t size, const void *data);
983 * Retrieve the MeshPeer stucture associated with the peer, create one
984 * and insert it in the appropriate structures if the peer is not known yet.
986 * @param peer Full identity of the peer.
988 * @return Existing or newly created peer info.
990 static struct MeshPeer *
991 peer_get (const struct GNUNET_PeerIdentity *peer);
995 * Retrieve the MeshPeer stucture associated with the peer, create one
996 * and insert it in the appropriate structures if the peer is not known yet.
998 * @param peer Short identity of the peer.
1000 * @return Existing or newly created peer info.
1002 static struct MeshPeer *
1003 peer_get_short (const GNUNET_PEER_Id peer);
1007 * Build a PeerPath from the paths returned from the DHT, reversing the paths
1008 * to obtain a local peer -> destination path and interning the peer ids.
1010 * @return Newly allocated and created path
1012 static struct MeshPeerPath *
1013 path_build_from_dht (const struct GNUNET_PeerIdentity *get_path,
1014 unsigned int get_path_length,
1015 const struct GNUNET_PeerIdentity *put_path,
1016 unsigned int put_path_length);
1020 * Adds a path to the data structs of all the peers in the path
1022 * @param p Path to process.
1023 * @param confirmed Whether we know if the path works or not.
1026 path_add_to_peers (struct MeshPeerPath *p, int confirmed);
1030 * Search for a tunnel by global ID using full PeerIdentities.
1032 * @param t Tunnel containing the channel.
1033 * @param chid Public channel number.
1035 * @return channel handler, NULL if doesn't exist
1037 static struct MeshChannel *
1038 channel_get (struct MeshTunnel2 *t, MESH_ChannelNumber chid);
1041 * Modify the data message ID from global to local and send to client.
1043 * @param ch Channel on which to send the message.
1044 * @param msg Message to modify and send.
1045 * @param fwd Forward?
1048 channel_send_client_data (struct MeshChannel *ch,
1049 const struct GNUNET_MESH_Data *msg,
1054 * Change the tunnel state.
1056 * @param t Tunnel whose state to change.
1057 * @param state New state.
1060 tunnel_change_state (struct MeshTunnel2 *t, enum MeshTunnelState state);
1064 * Notify a tunnel that a connection has broken that affects at least
1065 * some of its peers.
1067 * @param t Tunnel affected.
1068 * @param p1 Peer that got disconnected from p2.
1069 * @param p2 Peer that got disconnected from p1.
1071 * @return Short ID of the peer disconnected (either p1 or p2).
1072 * 0 if the tunnel remained unaffected.
1074 static GNUNET_PEER_Id
1075 tunnel_notify_connection_broken (struct MeshTunnel2 *t,
1076 GNUNET_PEER_Id p1, GNUNET_PEER_Id p2);
1079 * @brief Use the given path for the tunnel.
1080 * Update the next and prev hops (and RCs).
1081 * (Re)start the path refresh in case the tunnel is locally owned.
1083 * @param t Tunnel to update.
1084 * @param p Path to use.
1086 * @return Connection created.
1088 static struct MeshConnection *
1089 tunnel_use_path (struct MeshTunnel2 *t, struct MeshPeerPath *p);
1092 * Tunnel is empty: destroy it.
1094 * Notifies all participants (peers, cleints) about the destruction.
1096 * @param t Tunnel to destroy.
1099 tunnel_destroy_empty (struct MeshTunnel2 *t);
1102 * Destroy the tunnel.
1104 * This function does not generate any warning traffic to clients or peers.
1107 * Cancel messages belonging to this tunnel queued to neighbors.
1108 * Free any allocated resources linked to the tunnel.
1110 * @param t The tunnel to destroy.
1113 tunnel_destroy (struct MeshTunnel2 *t);
1116 * Create a connection.
1118 * @param cid Connection ID.
1120 static struct MeshConnection *
1121 connection_new (const struct GNUNET_HashCode *cid);
1124 * Connection is no longer needed: destroy it and remove from tunnel.
1126 * @param c Connection to destroy.
1129 connection_destroy (struct MeshConnection *c);
1132 * Send FWD keepalive packets for a connection.
1134 * @param cls Closure (connection for which to send the keepalive).
1135 * @param tc Notification context.
1138 connection_fwd_keepalive (void *cls,
1139 const struct GNUNET_SCHEDULER_TaskContext *tc);
1142 * Send BCK keepalive packets for a connection.
1144 * @param cls Closure (connection for which to send the keepalive).
1145 * @param tc Notification context.
1148 connection_bck_keepalive (void *cls,
1149 const struct GNUNET_SCHEDULER_TaskContext *tc);
1153 * Change the tunnel state.
1155 * @param c Connection whose state to change.
1156 * @param state New state.
1159 connection_change_state (struct MeshConnection* c,
1160 enum MeshConnectionState state);
1165 * @brief Queue and pass message to core when possible.
1167 * @param cls Closure (@c type dependant). It will be used by queue_send to
1168 * build the message to be sent if not already prebuilt.
1169 * @param type Type of the message, 0 for a raw message.
1170 * @param size Size of the message.
1171 * @param c Connection this message belongs to (cannot be NULL).
1172 * @param ch Channel this message belongs to, if applicable (otherwise NULL).
1173 * @param fwd Is this a message going root->dest? (FWD ACK are NOT FWD!)
1176 queue_add (void* cls,
1179 struct MeshConnection* c,
1180 struct MeshChannel* ch,
1185 * Free a transmission that was already queued with all resources
1186 * associated to the request.
1188 * @param queue Queue handler to cancel.
1189 * @param clear_cls Is it necessary to free associated cls?
1192 queue_destroy (struct MeshPeerQueue *queue, int clear_cls);
1196 * Core callback to write a queued packet to core buffer
1198 * @param cls Closure (peer info).
1199 * @param size Number of bytes available in buf.
1200 * @param buf Where the to write the message.
1202 * @return number of bytes written to buf
1205 queue_send (void *cls, size_t size, void *buf);
1209 * Demultiplex by message type and call appropriate handler for a message
1210 * towards a channel of a local tunnel.
1212 * @param t Tunnel this message came on.
1213 * @param msgh Message header.
1214 * @param fwd Is this message fwd?
1217 handle_decrypted (struct MeshTunnel2 *t,
1218 const struct GNUNET_MessageHeader *msgh,
1223 * Dummy function to separate declarations from definitions in function list.
1226 __mesh_divider______________________________________________________________();
1230 * Get string description for tunnel state.
1232 * @param s Tunnel state.
1234 * @return String representation.
1237 GNUNET_MESH_DEBUG_TS2S (enum MeshTunnelState s)
1239 static char buf[128];
1243 case MESH_TUNNEL_NEW:
1244 return "MESH_TUNNEL_NEW";
1245 case MESH_TUNNEL_SEARCHING:
1246 return "MESH_TUNNEL_SEARCHING";
1247 case MESH_TUNNEL_WAITING:
1248 return "MESH_TUNNEL_WAITING";
1249 case MESH_TUNNEL_READY:
1250 return "MESH_TUNNEL_READY";
1251 case MESH_TUNNEL_RECONNECTING:
1252 return "MESH_TUNNEL_RECONNECTING";
1255 sprintf (buf, "%u (UNKNOWN STATE)", s);
1262 * Get string description for tunnel state.
1264 * @param s Tunnel state.
1266 * @return String representation.
1269 GNUNET_MESH_DEBUG_CS2S (enum MeshTunnelState s)
1273 case MESH_CONNECTION_NEW:
1274 return "MESH_CONNECTION_NEW";
1275 case MESH_CONNECTION_SENT:
1276 return "MESH_CONNECTION_SENT";
1277 case MESH_CONNECTION_READY:
1278 return "MESH_CONNECTION_READY";
1280 return "MESH_CONNECTION_STATE_ERROR";
1286 /******************************************************************************/
1287 /************************ PERIODIC FUNCTIONS ****************************/
1288 /******************************************************************************/
1291 * Periodically announce self id in the DHT
1293 * @param cls closure
1294 * @param tc task context
1297 announce_id (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1299 struct PBlock block;
1301 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1303 announce_id_task = GNUNET_SCHEDULER_NO_TASK;
1307 * - Set data expiration in function of X
1308 * - Adapt X to churn
1310 DEBUG_DHT ("DHT_put for ID %s started.\n", GNUNET_i2s (&my_full_id));
1312 block.id = my_full_id;
1313 GNUNET_DHT_put (dht_handle, /* DHT handle */
1314 &my_full_id.hashPubKey, /* Key to use */
1315 dht_replication_level, /* Replication level */
1316 GNUNET_DHT_RO_RECORD_ROUTE | GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE, /* DHT options */
1317 GNUNET_BLOCK_TYPE_MESH_PEER, /* Block type */
1318 sizeof (block), /* Size of the data */
1319 (const char *) &block, /* Data itself */
1320 GNUNET_TIME_UNIT_FOREVER_ABS, /* Data expiration */
1321 GNUNET_TIME_UNIT_FOREVER_REL, /* Retry time */
1322 NULL, /* Continuation */
1323 NULL); /* Continuation closure */
1325 GNUNET_SCHEDULER_add_delayed (id_announce_time, &announce_id, cls);
1329 /******************************************************************************/
1330 /****************** GENERAL HELPER FUNCTIONS ************************/
1331 /******************************************************************************/
1335 * Get the static string for a peer ID.
1339 * @return Static string for it's ID.
1342 peer2s (const struct MeshPeer *peer)
1346 return GNUNET_i2s (GNUNET_PEER_resolve2 (peer->id));
1351 * Get the previous hop in a connection
1353 * @param c Connection.
1355 * @return Previous peer in the connection.
1357 static struct MeshPeer *
1358 connection_get_prev_hop (struct MeshConnection *c)
1362 if (0 == c->own_pos || c->path->length < 2)
1363 id = c->path->peers[0];
1365 id = c->path->peers[c->own_pos - 1];
1367 return peer_get_short (id);
1372 * Get the next hop in a connection
1374 * @param c Connection.
1376 * @return Next peer in the connection.
1378 static struct MeshPeer *
1379 connection_get_next_hop (struct MeshConnection *c)
1383 if ((c->path->length - 1) == c->own_pos || c->path->length < 2)
1384 id = c->path->peers[c->path->length - 1];
1386 id = c->path->peers[c->own_pos + 1];
1388 return peer_get_short (id);
1393 * Get the hop in a connection.
1395 * @param c Connection.
1396 * @param fwd Next hop?
1398 * @return Next peer in the connection.
1400 static struct MeshPeer *
1401 connection_get_hop (struct MeshConnection *c, int fwd)
1404 return connection_get_next_hop (c);
1405 return connection_get_prev_hop (c);
1409 * Check if client has registered with the service and has not disconnected
1411 * @param client the client to check
1413 * @return non-NULL if client exists in the global DLL
1415 static struct MeshClient *
1416 client_get (struct GNUNET_SERVER_Client *client)
1418 return GNUNET_SERVER_client_get_user_context (client, struct MeshClient);
1423 * Deletes a tunnel from a client (either owner or destination).
1425 * @param c Client whose tunnel to delete.
1426 * @param ch Channel which should be deleted.
1429 client_delete_channel (struct MeshClient *c, struct MeshChannel *ch)
1435 res = GNUNET_CONTAINER_multihashmap32_remove (c->own_channels,
1437 if (GNUNET_YES != res)
1438 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "client_delete_channel owner KO\n");
1442 res = GNUNET_CONTAINER_multihashmap32_remove (c->incoming_channels,
1444 if (GNUNET_YES != res)
1445 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "client_delete_tunnel client KO\n");
1451 * Notify the appropriate client that a new incoming channel was created.
1453 * @param ch Channel that was created.
1456 send_local_channel_create (struct MeshChannel *ch)
1458 struct GNUNET_MESH_ChannelMessage msg;
1459 struct MeshTunnel2 *t = ch->t;
1461 if (NULL == ch->dest)
1463 msg.header.size = htons (sizeof (msg));
1464 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE);
1465 msg.channel_id = htonl (ch->lid_dest);
1466 msg.port = htonl (ch->port);
1468 msg.opt |= GNUNET_YES == ch->reliable ? GNUNET_MESH_OPTION_RELIABLE : 0;
1469 msg.opt |= GNUNET_YES == ch->nobuffer ? GNUNET_MESH_OPTION_NOBUFFER : 0;
1470 msg.opt = htonl (msg.opt);
1471 GNUNET_PEER_resolve (t->peer->id, &msg.peer);
1472 GNUNET_SERVER_notification_context_unicast (nc, ch->dest->handle,
1473 &msg.header, GNUNET_NO);
1478 * Notify a client that the incoming tunnel is no longer valid.
1480 * @param ch Channel that is destroyed.
1481 * @param fwd Forward notification (owner->dest)?
1484 send_local_channel_destroy (struct MeshChannel *ch, int fwd)
1486 struct GNUNET_MESH_ChannelMessage msg;
1487 struct MeshClient *c;
1489 c = fwd ? ch->dest : ch->root;
1495 msg.header.size = htons (sizeof (msg));
1496 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY);
1497 msg.channel_id = htonl (fwd ? ch->lid_dest : ch->lid_root);
1498 msg.port = htonl (0);
1499 memset (&msg.peer, 0, sizeof (msg.peer));
1500 msg.opt = htonl (0);
1501 GNUNET_SERVER_notification_context_unicast (nc, c->handle,
1502 &msg.header, GNUNET_NO);
1507 * Build a local ACK message and send it to a local client, if needed.
1509 * If the client was already allowed to send data, do nothing.
1511 * @param ch Channel on which to send the ACK.
1512 * @param c Client to whom send the ACK.
1513 * @param fwd Set to GNUNET_YES for FWD ACK (dest->root)
1516 send_local_ack (struct MeshChannel *ch, int fwd)
1518 struct GNUNET_MESH_LocalAck msg;
1519 struct MeshChannelReliability *rel;
1520 struct MeshClient *c;
1522 c = fwd ? ch->root : ch->dest;
1523 rel = fwd ? ch->root_rel : ch->dest_rel;
1525 if (GNUNET_YES == rel->client_ready)
1526 return; /* don't send double ACKs to client */
1528 rel->client_ready = GNUNET_YES;
1530 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1531 "send local %s ack on %s:%X towards %p\n",
1532 fwd ? "FWD" : "BCK", peer2s (ch->t->peer), ch->gid, c);
1535 || ( fwd && (0 == ch->lid_root || c != ch->root))
1536 || (!fwd && (0 == ch->lid_dest || c != ch->dest)) )
1541 msg.header.size = htons (sizeof (msg));
1542 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK);
1543 msg.channel_id = htonl (fwd ? ch->lid_root : ch->lid_dest);
1544 GNUNET_SERVER_notification_context_unicast (nc,
1553 * Count established (ready) connections of a tunnel.
1555 * @param t Tunnel on which to send the message.
1557 * @return Number of connections.
1560 tunnel_count_connections (struct MeshTunnel2 *t)
1562 struct MeshConnection *c;
1565 for (c = t->connection_head, i = 0; NULL != c; c = c->next, i++);
1572 * Pick a connection on which send the next data message.
1574 * @param t Tunnel on which to send the message.
1575 * @param fwd Is this a fwd message?
1577 * @return The connection on which to send the next message.
1579 static struct MeshConnection *
1580 tunnel_get_connection (struct MeshTunnel2 *t, int fwd)
1582 struct MeshConnection *c;
1583 struct MeshConnection *best;
1584 struct MeshFlowControl *fc;
1585 unsigned int lowest_q;
1587 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "tunnel_get_connection %s\n",
1590 lowest_q = UINT_MAX;
1591 for (c = t->connection_head; NULL != c; c = c->next)
1593 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " connection %s, \n",
1594 GNUNET_h2s (&c->id));
1595 if (MESH_CONNECTION_READY == c->state)
1597 fc = fwd ? &c->fwd_fc : &c->bck_fc;
1603 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " q_n %u, \n", fc->queue_n);
1604 if (fc->queue_n < lowest_q)
1607 lowest_q = fc->queue_n;
1616 * Is this peer the first one on the connection?
1618 * @param c Connection.
1619 * @param fwd Is this about fwd traffic?
1621 * @return GNUNET_YES if origin, GNUNET_NO if relay/terminal.
1624 connection_is_origin (struct MeshConnection *c, int fwd)
1626 if (!fwd && c->own_pos == c->path->length - 1)
1628 if (fwd && c->own_pos == 0)
1635 * Is this peer the last one on the connection?
1637 * @param c Connection.
1638 * @param fwd Is this about fwd traffic?
1639 * Note that the ROOT is the terminal for BCK traffic!
1641 * @return GNUNET_YES if terminal, GNUNET_NO if relay/origin.
1644 connection_is_terminal (struct MeshConnection *c, int fwd)
1646 if (fwd && c->own_pos == c->path->length - 1)
1648 if (!fwd && c->own_pos == 0)
1655 * Is the recipient client for this channel on this peer?
1657 * @param ch Channel.
1658 * @param fwd Is this for fwd traffic?
1660 * @return GNUNET_YES in case it is.
1663 channel_is_terminal (struct MeshChannel *ch, int fwd)
1665 if (NULL == ch->t || NULL == ch->t->connection_head)
1670 return connection_is_terminal (ch->t->connection_head, fwd);
1675 * Get free buffer space towards the client on a specific channel.
1677 * @param ch Channel.
1678 * @param fwd Is query about FWD traffic?
1680 * @return Free buffer space [0 - 64]
1683 channel_get_buffer (struct MeshChannel *ch, int fwd)
1685 struct MeshChannelReliability *rel;
1687 rel = fwd ? ch->dest_rel : ch->root_rel;
1689 /* If rel is NULL it means that the end is not yet created,
1690 * most probably is a loopback channel at the point of sending
1691 * the ChannelCreate to itself.
1696 return (64 - rel->n_recv);
1701 * Get free buffer space in a connection.
1703 * @param c Connection.
1704 * @param fwd Is query about FWD traffic?
1706 * @return Free buffer space [0 - max_msgs_queue/max_connections]
1709 connection_get_buffer (struct MeshConnection *c, int fwd)
1711 struct MeshFlowControl *fc;
1713 fc = fwd ? &c->fwd_fc : &c->bck_fc;
1715 return (fc->queue_max - fc->queue_n);
1720 * Get the total buffer space for a tunnel.
1723 tunnel_get_buffer (struct MeshTunnel2 *t, int fwd)
1725 struct MeshConnection *c;
1726 struct MeshFlowControl *fc;
1727 unsigned int buffer;
1729 c = t->connection_head;
1738 /* If terminal, return biggest channel buffer */
1739 if (connection_is_terminal (c, fwd))
1741 struct MeshChannel *ch;
1742 unsigned int ch_buf;
1744 if (NULL == t->channel_head)
1747 for (ch = t->channel_head; NULL != ch; ch = ch->next)
1749 ch_buf = channel_get_buffer (ch, fwd);
1750 if (ch_buf > buffer)
1756 /* If not terminal, return sum of connection buffers */
1759 if (c->state != MESH_CONNECTION_READY)
1762 fc = fwd ? &c->fwd_fc : &c->bck_fc;
1763 buffer += fc->last_ack_recv - fc->last_pid_sent;
1772 * FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME
1773 * Encrypt data with the tunnel key.
1775 * @param t Tunnel whose key to use.
1776 * @param dst Destination for the encrypted data.
1777 * @param src Source of the plaintext.
1778 * @param size Size of the plaintext.
1779 * @param iv Initialization Vector to use.
1780 * @param fwd Is this a fwd message?
1783 tunnel_encrypt (struct MeshTunnel2 *t,
1784 void *dst, const void *src,
1785 size_t size, uint64_t iv, int fwd)
1787 memcpy (dst, src, size);
1792 * FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME
1793 * Decrypt data with the tunnel key.
1795 * @param t Tunnel whose key to use.
1796 * @param dst Destination for the plaintext.
1797 * @param src Source of the encrypted data.
1798 * @param size Size of the encrypted data.
1799 * @param iv Initialization Vector to use.
1800 * @param fwd Is this a fwd message?
1803 tunnel_decrypt (struct MeshTunnel2 *t,
1804 void *dst, const void *src,
1805 size_t size, uint64_t iv, int fwd)
1807 memcpy (dst, src, size);
1812 * Sends an already built message on a connection, properly registering
1813 * all used resources.
1815 * @param message Message to send. Function makes a copy of it.
1816 * If message is not hop-by-hop, decrements TTL of copy.
1817 * @param c Connection on which this message is transmitted.
1818 * @param ch Channel on which this message is transmitted, or NULL.
1819 * @param fwd Is this a fwd message?
1822 send_prebuilt_message_connection (const struct GNUNET_MessageHeader *message,
1823 struct MeshConnection *c,
1824 struct MeshChannel *ch,
1831 size = ntohs (message->size);
1832 data = GNUNET_malloc (size);
1833 memcpy (data, message, size);
1834 type = ntohs (message->type);
1835 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Send %s (%u) on connection %s\n",
1836 GNUNET_MESH_DEBUG_M2S (type), size, GNUNET_h2s (&c->id));
1840 struct GNUNET_MESH_Encrypted *emsg;
1841 struct GNUNET_MESH_ACK *amsg;
1842 struct GNUNET_MESH_Poll *pmsg;
1843 struct GNUNET_MESH_ConnectionDestroy *dmsg;
1844 struct GNUNET_MESH_ConnectionBroken *bmsg;
1847 case GNUNET_MESSAGE_TYPE_MESH_FWD:
1848 case GNUNET_MESSAGE_TYPE_MESH_BCK:
1849 emsg = (struct GNUNET_MESH_Encrypted *) data;
1850 ttl = ntohl (emsg->ttl);
1853 GNUNET_break_op (0);
1857 emsg->ttl = htonl (ttl - 1);
1858 emsg->pid = htonl (fwd ? c->fwd_fc.next_pid++ : c->bck_fc.next_pid++);
1859 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " pid %u\n", ntohl (emsg->pid));
1862 case GNUNET_MESSAGE_TYPE_MESH_ACK:
1863 amsg = (struct GNUNET_MESH_ACK *) data;
1865 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ack %u\n", ntohl (amsg->ack));
1868 case GNUNET_MESSAGE_TYPE_MESH_POLL:
1869 pmsg = (struct GNUNET_MESH_Poll *) data;
1871 pmsg->pid = htonl (fwd ? c->fwd_fc.last_pid_sent : c->bck_fc.last_pid_sent);
1872 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " poll %u\n", ntohl (pmsg->pid));
1875 case GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY:
1876 dmsg = (struct GNUNET_MESH_ConnectionDestroy *) data;
1881 case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_BROKEN:
1882 bmsg = (struct GNUNET_MESH_ConnectionBroken *) data;
1887 case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_CREATE:
1904 * Sends an already built message on a tunnel, choosing the best connection.
1906 * @param message Message to send. Function modifies it.
1907 * @param t Tunnel on which this message is transmitted.
1908 * @param ch Channel on which this message is transmitted.
1909 * @param fwd Is this a fwd message?
1912 send_prebuilt_message_tunnel (struct GNUNET_MESH_Encrypted *msg,
1913 struct MeshTunnel2 *t,
1914 struct MeshChannel *ch,
1917 struct MeshConnection *c;
1920 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Send on Tunnel %s\n",
1922 c = tunnel_get_connection (t, fwd);
1925 GNUNET_break (GNUNET_YES == t->destroy);
1928 type = ntohs (msg->header.type);
1931 case GNUNET_MESSAGE_TYPE_MESH_FWD:
1932 case GNUNET_MESSAGE_TYPE_MESH_BCK:
1933 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE:
1934 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY:
1936 msg->ttl = htonl (default_ttl);
1939 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "unkown type %s\n",
1940 GNUNET_MESH_DEBUG_M2S (type));
1945 send_prebuilt_message_connection (&msg->header, c, ch, fwd);
1950 * Sends an already built message on a channel, properly registering
1951 * all used resources and encrypting the message with the tunnel's key.
1953 * @param message Message to send. Function makes a copy of it.
1954 * @param ch Channel on which this message is transmitted.
1955 * @param fwd Is this a fwd message?
1958 send_prebuilt_message_channel (const struct GNUNET_MessageHeader *message,
1959 struct MeshChannel *ch,
1962 struct GNUNET_MESH_Encrypted *msg;
1963 size_t size = ntohs (message->size);
1964 char *cbuf[sizeof (struct GNUNET_MESH_Encrypted) + size];
1968 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Send on Channel %s:%X\n",
1969 peer2s (ch->t->peer), ch->gid);
1970 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " %s\n",
1971 GNUNET_MESH_DEBUG_M2S (ntohs (message->type)));
1973 if (channel_is_terminal (ch, fwd))
1975 handle_decrypted (ch->t, message, fwd);
1979 type = fwd ? GNUNET_MESSAGE_TYPE_MESH_FWD : GNUNET_MESSAGE_TYPE_MESH_BCK;
1980 iv = GNUNET_CRYPTO_random_u64 (GNUNET_CRYPTO_QUALITY_NONCE, UINT64_MAX);
1982 msg = (struct GNUNET_MESH_Encrypted *) cbuf;
1983 msg->header.type = htons (type);
1984 msg->header.size = htons (sizeof (struct GNUNET_MESH_Encrypted) + size);
1985 msg->iv = GNUNET_htonll (iv);
1986 tunnel_encrypt (ch->t, &msg[1], message, size, iv, fwd);
1987 send_prebuilt_message_tunnel (msg, ch->t, ch, fwd);
1992 * Sends a CREATE CONNECTION message for a path to a peer.
1993 * Changes the connection and tunnel states if necessary.
1995 * @param connection Connection to create.
1998 send_connection_create (struct MeshConnection *connection)
2000 struct MeshTunnel2 *t;
2003 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Send connection create\n");
2005 GNUNET_MESSAGE_TYPE_MESH_CONNECTION_CREATE,
2006 sizeof (struct GNUNET_MESH_ConnectionCreate) +
2007 (connection->path->length *
2008 sizeof (struct GNUNET_PeerIdentity)),
2013 (MESH_TUNNEL_SEARCHING == t->state || MESH_TUNNEL_NEW == t->state))
2014 tunnel_change_state (t, MESH_TUNNEL_WAITING);
2015 if (MESH_CONNECTION_NEW == connection->state)
2016 connection_change_state (connection, MESH_CONNECTION_SENT);
2021 * Sends a CONNECTION ACK message in reponse to a received CONNECTION_CREATE
2024 * @param connection Connection to confirm.
2025 * @param fwd Is this a fwd ACK? (First is bck (SYNACK), second is fwd (ACK))
2028 send_connection_ack (struct MeshConnection *connection, int fwd)
2030 struct MeshTunnel2 *t;
2033 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Send connection ack\n");
2035 GNUNET_MESSAGE_TYPE_MESH_CONNECTION_ACK,
2036 sizeof (struct GNUNET_MESH_ConnectionACK),
2040 if (MESH_TUNNEL_NEW == t->state)
2041 tunnel_change_state (t, MESH_TUNNEL_WAITING);
2046 * Core callback to write a pre-constructed data packet to core buffer
2048 * @param cls Closure (MeshTransmissionDescriptor with data in "data" member).
2049 * @param size Number of bytes available in buf.
2050 * @param buf Where the to write the message.
2052 * @return number of bytes written to buf
2055 send_core_data_raw (void *cls, size_t size, void *buf)
2057 struct GNUNET_MessageHeader *msg = cls;
2060 GNUNET_assert (NULL != msg);
2061 total_size = ntohs (msg->size);
2063 if (total_size > size)
2068 memcpy (buf, msg, total_size);
2075 * Function to send a create connection message to a peer.
2077 * @param c Connection to create.
2078 * @param size number of bytes available in buf
2079 * @param buf where the callee should write the message
2080 * @return number of bytes written to buf
2083 send_core_connection_create (struct MeshConnection *c, size_t size, void *buf)
2085 struct GNUNET_MESH_ConnectionCreate *msg;
2086 struct GNUNET_PeerIdentity *peer_ptr;
2087 struct MeshPeerPath *p = c->path;
2091 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Sending CONNECTION CREATE...\n");
2093 sizeof (struct GNUNET_MESH_ConnectionCreate) +
2094 p->length * sizeof (struct GNUNET_PeerIdentity);
2096 if (size < size_needed || NULL == buf)
2101 msg = (struct GNUNET_MESH_ConnectionCreate *) buf;
2102 msg->header.size = htons (size_needed);
2103 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CONNECTION_CREATE);
2106 peer_ptr = (struct GNUNET_PeerIdentity *) &msg[1];
2107 for (i = 0; i < p->length; i++)
2109 GNUNET_PEER_resolve (p->peers[i], peer_ptr++);
2112 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2113 "CONNECTION CREATE (%u bytes long) sent!\n", size_needed);
2119 * Creates a path ack message in buf and frees all unused resources.
2121 * @param c Connection to send an ACK on.
2122 * @param size number of bytes available in buf
2123 * @param buf where the callee should write the message
2125 * @return number of bytes written to buf
2128 send_core_connection_ack (struct MeshConnection *c, size_t size, void *buf)
2130 struct GNUNET_MESH_ConnectionACK *msg = buf;
2131 struct MeshTunnel2 *t = c->t;
2133 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Sending CONNECTION ACK...\n");
2134 GNUNET_assert (NULL != t);
2135 if (sizeof (struct GNUNET_MESH_ConnectionACK) > size)
2140 msg->header.size = htons (sizeof (struct GNUNET_MESH_ConnectionACK));
2141 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CONNECTION_ACK);
2145 /* TODO add signature */
2147 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "CONNECTION ACK sent!\n");
2148 return sizeof (struct GNUNET_MESH_ConnectionACK);
2153 * Destroy the peer_info and free any allocated resources linked to it
2155 * @param peer The peer_info to destroy.
2157 * @return GNUNET_OK on success
2160 peer_destroy (struct MeshPeer *peer)
2162 struct GNUNET_PeerIdentity id;
2163 struct MeshPeerPath *p;
2164 struct MeshPeerPath *nextp;
2166 GNUNET_PEER_resolve (peer->id, &id);
2167 GNUNET_PEER_change_rc (peer->id, -1);
2170 GNUNET_CONTAINER_multihashmap_remove (peers, &id.hashPubKey, peer))
2173 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2174 "removing peer %s, not in hashmap\n", GNUNET_i2s (&id));
2176 if (NULL != peer->dhtget)
2178 GNUNET_DHT_get_stop (peer->dhtget);
2180 p = peer->path_head;
2184 GNUNET_CONTAINER_DLL_remove (peer->path_head, peer->path_tail, p);
2188 tunnel_destroy_empty (peer->tunnel);
2195 * Returns if peer is used (has a tunnel, is neighbor).
2197 * @peer Peer to check.
2199 * @return GNUNET_YES if peer is in use.
2202 peer_is_used (struct MeshPeer *peer)
2204 struct MeshPeerPath *p;
2206 if (NULL != peer->tunnel)
2209 for (p = peer->path_head; NULL != p; p = p->next)
2218 * Iterator over all the peers to get the oldest timestamp.
2220 * @param cls Closure (unsued).
2221 * @param key ID of the peer.
2222 * @param value Peer_Info of the peer.
2225 peer_get_oldest (void *cls,
2226 const struct GNUNET_HashCode *key,
2229 struct MeshPeer *p = value;
2230 struct GNUNET_TIME_Absolute *abs = cls;
2232 /* Don't count active peers */
2233 if (GNUNET_YES == peer_is_used (p))
2236 if (abs->abs_value_us < p->last_contact.abs_value_us)
2237 abs->abs_value_us = p->last_contact.abs_value_us;
2244 * Iterator over all the peers to remove the oldest entry.
2246 * @param cls Closure (unsued).
2247 * @param key ID of the peer.
2248 * @param value Peer_Info of the peer.
2251 peer_timeout (void *cls,
2252 const struct GNUNET_HashCode *key,
2255 struct MeshPeer *p = value;
2256 struct GNUNET_TIME_Absolute *abs = cls;
2258 if (p->last_contact.abs_value_us == abs->abs_value_us &&
2259 GNUNET_NO == peer_is_used (p))
2269 * Delete oldest unused peer.
2272 peer_delete_oldest (void)
2274 struct GNUNET_TIME_Absolute abs;
2276 abs = GNUNET_TIME_UNIT_FOREVER_ABS;
2278 GNUNET_CONTAINER_multihashmap_iterate (peers,
2281 GNUNET_CONTAINER_multihashmap_iterate (peers,
2288 * Retrieve the MeshPeer stucture associated with the peer, create one
2289 * and insert it in the appropriate structures if the peer is not known yet.
2291 * @param peer Full identity of the peer.
2293 * @return Existing or newly created peer info.
2295 static struct MeshPeer *
2296 peer_get (const struct GNUNET_PeerIdentity *peer_id)
2298 struct MeshPeer *peer;
2300 peer = GNUNET_CONTAINER_multihashmap_get (peers, &peer_id->hashPubKey);
2303 peer = GNUNET_new (struct MeshPeer);
2304 if (GNUNET_CONTAINER_multihashmap_size (peers) > max_peers)
2306 peer_delete_oldest ();
2308 GNUNET_CONTAINER_multihashmap_put (peers, &peer_id->hashPubKey, peer,
2309 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST);
2310 peer->id = GNUNET_PEER_intern (peer_id);
2312 peer->last_contact = GNUNET_TIME_absolute_get();
2319 * Retrieve the MeshPeer stucture associated with the peer, create one
2320 * and insert it in the appropriate structures if the peer is not known yet.
2322 * @param peer Short identity of the peer.
2324 * @return Existing or newly created peer info.
2326 static struct MeshPeer *
2327 peer_get_short (const GNUNET_PEER_Id peer)
2329 return peer_get (GNUNET_PEER_resolve2 (peer));
2334 * Get a cost of a path for a peer considering existing tunnel connections.
2336 * @param peer Peer towards which the path is considered.
2337 * @param path Candidate path.
2339 * @return Cost of the path (path length + number of overlapping nodes)
2342 peer_get_path_cost (const struct MeshPeer *peer,
2343 const struct MeshPeerPath *path)
2345 struct MeshConnection *c;
2346 unsigned int overlap;
2354 GNUNET_assert (NULL != peer->tunnel);
2356 for (i = 0; i < path->length; i++)
2358 for (c = peer->tunnel->connection_head; NULL != c; c = c->next)
2360 for (j = 0; j < c->path->length; j++)
2362 if (path->peers[i] == c->path->peers[j])
2370 return (path->length + overlap) * (path->score * -1);
2375 * Choose the best path towards a peer considering the tunnel properties.
2377 * @param peer The destination peer.
2379 * @return Best current known path towards the peer, if any.
2381 static struct MeshPeerPath *
2382 peer_get_best_path (const struct MeshPeer *peer)
2384 struct MeshPeerPath *best_p;
2385 struct MeshPeerPath *p;
2386 struct MeshConnection *c;
2387 unsigned int best_cost;
2390 best_cost = UINT_MAX;
2392 for (p = peer->path_head; NULL != p; p = p->next)
2394 for (c = peer->tunnel->connection_head; NULL != c; c = c->next)
2398 continue; /* If path is in use in a connection, skip it. */
2400 if ((cost = peer_get_path_cost (peer, p)) < best_cost)
2410 queue_is_sendable (struct MeshPeerQueue *q)
2412 struct MeshFlowControl *fc;
2414 /* Is PID-independent? */
2417 case GNUNET_MESSAGE_TYPE_MESH_ACK:
2418 case GNUNET_MESSAGE_TYPE_MESH_POLL:
2422 /* Is PID allowed? */
2423 fc = q->fwd ? &q->c->fwd_fc : &q->c->bck_fc;
2424 if (GMC_is_pid_bigger (fc->last_ack_recv, fc->last_pid_sent))
2432 * Get first sendable message.
2434 * @param peer The destination peer.
2436 * @return Best current known path towards the peer, if any.
2438 static struct MeshPeerQueue *
2439 peer_get_first_message (const struct MeshPeer *peer)
2441 struct MeshPeerQueue *q;
2443 for (q = peer->queue_head; NULL != q; q = q->next)
2445 if (queue_is_sendable (q))
2454 * Try to establish a new connection to this peer in the given tunnel.
2455 * If the peer doesn't have any path to it yet, try to get one.
2456 * If the peer already has some path, send a CREATE CONNECTION towards it.
2458 * @param peer PeerInfo of the peer.
2461 peer_connect (struct MeshPeer *peer)
2463 struct MeshTunnel2 *t;
2464 struct MeshPeerPath *p;
2465 struct MeshConnection *c;
2467 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2468 "peer_connect towards %s\n",
2471 if (NULL != peer->path_head)
2473 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "path exists\n");
2474 p = peer_get_best_path (peer);
2477 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " %u hops\n", p->length);
2478 c = tunnel_use_path (t, p);
2479 send_connection_create (c);
2482 else if (NULL == peer->dhtget)
2484 const struct GNUNET_PeerIdentity *id;
2486 id = GNUNET_PEER_resolve2 (peer->id);
2487 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2488 " Starting DHT GET for peer %s\n", peer2s (peer));
2489 peer->dhtget = GNUNET_DHT_get_start (dht_handle, /* handle */
2490 GNUNET_BLOCK_TYPE_MESH_PEER, /* type */
2491 &id->hashPubKey, /* key to search */
2492 dht_replication_level, /* replication level */
2493 GNUNET_DHT_RO_RECORD_ROUTE |
2494 GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE,
2496 0, /* xquery bits */
2497 &dht_get_id_handler, peer);
2498 if (MESH_TUNNEL_NEW == t->state)
2499 tunnel_change_state (t, MESH_TUNNEL_SEARCHING);
2503 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2504 "There is no path but the DHT GET is already started.\n");
2510 * Get the first transmittable message for a connection.
2512 * @param c Connection.
2513 * @param fwd Is this FWD?
2515 * @return First transmittable message.
2517 static struct MeshPeerQueue *
2518 connection_get_first_message (struct MeshConnection *c, int fwd)
2520 struct MeshPeerQueue *q;
2523 p = connection_get_hop (c, fwd);
2525 for (q = p->queue_head; NULL != q; q = q->next)
2529 if (queue_is_sendable (q))
2538 * @brief Re-initiate traffic on this connection if necessary.
2540 * Check if there is traffic queued towards this peer
2541 * and the core transmit handle is NULL (traffic was stalled).
2542 * If so, call core tmt rdy.
2544 * @param c Connection on which initiate traffic.
2545 * @param fwd Is this about fwd traffic?
2548 connection_unlock_queue (struct MeshConnection *c, int fwd)
2550 struct MeshPeer *peer;
2551 struct MeshPeerQueue *q;
2554 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2555 "connection_unlock_queue %s on %s\n",
2556 fwd ? "FWD" : "BCK", GNUNET_h2s (&c->id));
2558 if (connection_is_origin (c, fwd))
2560 struct MeshTunnel2 *t = c->t;
2561 struct MeshChannel *ch;
2562 struct MeshChannelReliability *rel;
2564 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " is origin!\n");
2565 /* FIXME randomize channel selection, not always first channel */
2566 for (ch = t->channel_head; NULL != ch; ch = ch->next)
2568 rel = fwd ? ch->root_rel : ch->dest_rel;
2570 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " channel %X - %s\n",
2571 ch->gid, rel->client_ready ? "ready " : "not ready");
2572 if (GNUNET_NO == rel->client_ready)
2574 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " sending local ack!\n");
2575 send_local_ack (ch, fwd);
2576 return; /* FIXME authorize all channels? */
2582 peer = connection_get_hop (c, fwd);
2584 if (NULL != peer->core_transmit)
2586 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " already unlocked!\n");
2587 return; /* Already unlocked */
2590 q = connection_get_first_message (c, fwd);
2593 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " queue empty!\n");
2594 return; /* Nothing to transmit */
2598 peer->core_transmit =
2599 GNUNET_CORE_notify_transmit_ready (core_handle,
2602 GNUNET_TIME_UNIT_FOREVER_REL,
2603 GNUNET_PEER_resolve2 (peer->id),
2611 * Cancel all transmissions that belong to a certain connection.
2613 * @param c Connection which to cancel.
2614 * @param fwd Cancel fwd traffic?
2617 connection_cancel_queues (struct MeshConnection *c, int fwd)
2619 struct MeshPeerQueue *q;
2620 struct MeshPeerQueue *next;
2621 struct MeshFlowControl *fc;
2622 struct MeshPeer *peer;
2629 fc = fwd ? &c->fwd_fc : &c->bck_fc;
2630 peer = connection_get_hop (c, fwd);
2632 for (q = peer->queue_head; NULL != q; q = next)
2637 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2638 "connection_cancel_queue %s\n",
2639 GNUNET_MESH_DEBUG_M2S (q->type));
2640 queue_destroy (q, GNUNET_YES);
2643 if (NULL == peer->queue_head)
2645 if (NULL != peer->core_transmit)
2647 GNUNET_CORE_notify_transmit_ready_cancel (peer->core_transmit);
2648 peer->core_transmit = NULL;
2650 if (GNUNET_SCHEDULER_NO_TASK != fc->poll_task)
2652 GNUNET_SCHEDULER_cancel (fc->poll_task);
2653 fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
2660 * Remove all paths that rely on a direct connection between p1 and p2
2661 * from the peer itself and notify all tunnels about it.
2663 * @param peer PeerInfo of affected peer.
2664 * @param p1 GNUNET_PEER_Id of one peer.
2665 * @param p2 GNUNET_PEER_Id of another peer that was connected to the first and
2668 * TODO: optimize (see below)
2671 peer_remove_path (struct MeshPeer *peer, GNUNET_PEER_Id p1,
2674 struct MeshPeerPath *p;
2675 struct MeshPeerPath *next;
2676 struct MeshPeer *peer_d;
2678 unsigned int destroyed;
2681 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "peer_info_remove_path\n");
2683 for (p = peer->path_head; NULL != p; p = next)
2686 for (i = 0; i < (p->length - 1); i++)
2688 if ((p->peers[i] == p1 && p->peers[i + 1] == p2) ||
2689 (p->peers[i] == p2 && p->peers[i + 1] == p1))
2691 GNUNET_CONTAINER_DLL_remove (peer->path_head, peer->path_tail, p);
2702 d = tunnel_notify_connection_broken (peer->tunnel, p1, p2);
2704 peer_d = peer_get_short (d); // FIXME
2705 next = peer_get_best_path (peer_d);
2706 tunnel_use_path (peer->tunnel, next);
2707 peer_connect (peer_d);
2709 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "peer_info_remove_path END\n");
2714 * Add the path to the peer and update the path used to reach it in case this
2717 * @param peer_info Destination peer to add the path to.
2718 * @param path New path to add. Last peer must be the peer in arg 1.
2719 * Path will be either used of freed if already known.
2720 * @param trusted Do we trust that this path is real?
2723 peer_add_path (struct MeshPeer *peer_info, struct MeshPeerPath *path,
2726 struct MeshPeerPath *aux;
2730 if ((NULL == peer_info) || (NULL == path))
2733 path_destroy (path);
2736 if (path->peers[path->length - 1] != peer_info->id)
2739 path_destroy (path);
2742 if (2 >= path->length && GNUNET_NO == trusted)
2744 /* Only allow CORE to tell us about direct paths */
2745 path_destroy (path);
2748 for (l = 1; l < path->length; l++)
2750 if (path->peers[l] == myid)
2752 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "shortening path by %u\n", l);
2753 for (l2 = 0; l2 < path->length - l; l2++)
2755 path->peers[l2] = path->peers[l + l2];
2760 GNUNET_realloc (path->peers, path->length * sizeof (GNUNET_PEER_Id));
2764 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "adding path [%u] to peer %s\n",
2765 path->length, peer2s (peer_info));
2767 l = path_get_length (path);
2770 path_destroy (path);
2774 GNUNET_assert (peer_info->id == path->peers[path->length - 1]);
2775 for (aux = peer_info->path_head; aux != NULL; aux = aux->next)
2777 l2 = path_get_length (aux);
2780 GNUNET_CONTAINER_DLL_insert_before (peer_info->path_head,
2781 peer_info->path_tail, aux, path);
2786 if (l2 == l && memcmp (path->peers, aux->peers, l) == 0)
2788 path_destroy (path);
2793 GNUNET_CONTAINER_DLL_insert_tail (peer_info->path_head, peer_info->path_tail,
2800 * Add the path to the origin peer and update the path used to reach it in case
2801 * this is the shortest.
2802 * The path is given in peer_info -> destination, therefore we turn the path
2803 * upside down first.
2805 * @param peer_info Peer to add the path to, being the origin of the path.
2806 * @param path New path to add after being inversed.
2807 * Path will be either used or freed.
2808 * @param trusted Do we trust that this path is real?
2811 peer_add_path_to_origin (struct MeshPeer *peer_info,
2812 struct MeshPeerPath *path, int trusted)
2817 peer_add_path (peer_info, path, trusted);
2823 * Function called if a connection has been stalled for a while,
2824 * possibly due to a missed ACK. Poll the neighbor about its ACK status.
2826 * @param cls Closure (poll ctx).
2827 * @param tc TaskContext.
2830 connection_poll (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
2832 struct MeshFlowControl *fc = cls;
2833 struct GNUNET_MESH_Poll msg;
2834 struct MeshConnection *c;
2836 fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
2837 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
2843 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " *** Polling!\n");
2844 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " *** connection %s[%X]\n",
2845 peer2s (c->t->peer), c->id);
2846 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " *** %s\n",
2847 fc == &c->fwd_fc ? "FWD" : "BCK");
2849 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_POLL);
2850 msg.header.size = htons (sizeof (msg));
2851 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " *** pid (%u)!\n", fc->last_pid_sent);
2852 send_prebuilt_message_connection (&msg.header, c, NULL, fc == &c->fwd_fc);
2853 fc->poll_time = GNUNET_TIME_STD_BACKOFF (fc->poll_time);
2854 fc->poll_task = GNUNET_SCHEDULER_add_delayed (fc->poll_time,
2855 &connection_poll, fc);
2860 * Build a PeerPath from the paths returned from the DHT, reversing the paths
2861 * to obtain a local peer -> destination path and interning the peer ids.
2863 * @return Newly allocated and created path
2865 static struct MeshPeerPath *
2866 path_build_from_dht (const struct GNUNET_PeerIdentity *get_path,
2867 unsigned int get_path_length,
2868 const struct GNUNET_PeerIdentity *put_path,
2869 unsigned int put_path_length)
2871 struct MeshPeerPath *p;
2877 GNUNET_PEER_change_rc (myid, 1);
2878 i = get_path_length;
2879 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " GET has %d hops.\n", i);
2880 for (i--; i >= 0; i--)
2882 id = GNUNET_PEER_intern (&get_path[i]);
2883 if (p->length > 0 && id == p->peers[p->length - 1])
2885 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Optimizing 1 hop out.\n");
2886 GNUNET_PEER_change_rc (id, -1);
2890 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Adding from GET: %s.\n",
2891 GNUNET_i2s (&get_path[i]));
2893 p->peers = GNUNET_realloc (p->peers, sizeof (GNUNET_PEER_Id) * p->length);
2894 p->peers[p->length - 1] = id;
2897 i = put_path_length;
2898 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " PUT has %d hops.\n", i);
2899 for (i--; i >= 0; i--)
2901 id = GNUNET_PEER_intern (&put_path[i]);
2904 /* PUT path went through us, so discard the path up until now and start
2905 * from here to get a much shorter (and loop-free) path.
2910 if (p->length > 0 && id == p->peers[p->length - 1])
2912 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Optimizing 1 hop out.\n");
2913 GNUNET_PEER_change_rc (id, -1);
2917 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Adding from PUT: %s.\n",
2918 GNUNET_i2s (&put_path[i]));
2920 p->peers = GNUNET_realloc (p->peers, sizeof (GNUNET_PEER_Id) * p->length);
2921 p->peers[p->length - 1] = id;
2925 if (get_path_length > 0)
2926 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " (first of GET: %s)\n",
2927 GNUNET_i2s (&get_path[0]));
2928 if (put_path_length > 0)
2929 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " (first of PUT: %s)\n",
2930 GNUNET_i2s (&put_path[0]));
2931 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " In total: %d hops\n",
2933 for (i = 0; i < p->length; i++)
2935 struct GNUNET_PeerIdentity peer_id;
2937 GNUNET_PEER_resolve (p->peers[i], &peer_id);
2938 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " %u: %s\n", p->peers[i],
2939 GNUNET_i2s (&peer_id));
2947 * Adds a path to the peer_infos of all the peers in the path
2949 * @param p Path to process.
2950 * @param confirmed Whether we know if the path works or not.
2953 path_add_to_peers (struct MeshPeerPath *p, int confirmed)
2957 /* TODO: invert and add */
2958 for (i = 0; i < p->length && p->peers[i] != myid; i++) /* skip'em */ ;
2959 for (i++; i < p->length; i++)
2961 struct MeshPeer *aux;
2962 struct MeshPeerPath *copy;
2964 aux = peer_get_short (p->peers[i]);
2965 copy = path_duplicate (p);
2966 copy->length = i + 1;
2967 peer_add_path (aux, copy, p->length < 3 ? GNUNET_NO : confirmed);
2973 * Search for a channel among the channels for a client
2975 * @param c the client whose channels to search in
2976 * @param chid the local id of the channel
2978 * @return channel handler, NULL if doesn't exist
2980 static struct MeshChannel *
2981 channel_get_by_local_id (struct MeshClient *c, MESH_ChannelNumber chid)
2983 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " -- get CHID %X\n", chid);
2984 if (0 == (chid & GNUNET_MESH_LOCAL_CHANNEL_ID_CLI))
2986 GNUNET_break_op (0);
2987 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "CHID %X not a local chid\n", chid);
2990 if (chid >= GNUNET_MESH_LOCAL_CHANNEL_ID_SERV)
2991 return GNUNET_CONTAINER_multihashmap32_get (c->incoming_channels, chid);
2992 return GNUNET_CONTAINER_multihashmap32_get (c->own_channels, chid);
2998 channel_debug (struct MeshChannel *ch)
3002 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "*** DEBUG NULL CHANNEL ***\n");
3005 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Channel %s:%X\n",
3006 peer2s (ch->t->peer), ch->gid);
3007 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " root %p/%p\n",
3008 ch->root, ch->root_rel);
3009 if (NULL != ch->root)
3011 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " cli %u\n", ch->root->id);
3012 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ready %s\n",
3013 ch->root_rel->client_ready ? "YES" : "NO");
3014 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " id %X\n", ch->lid_root);
3016 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " root %p/%p\n",
3017 ch->dest, ch->dest_rel);
3018 if (NULL != ch->dest)
3020 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " cli %u\n", ch->dest->id);
3021 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ready %s\n",
3022 ch->dest_rel->client_ready ? "YES" : "NO");
3023 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " id %X\n", ch->lid_dest);
3028 fc_debug (struct MeshFlowControl *fc)
3030 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " IN: %u/%u\n",
3031 fc->last_pid_recv, fc->last_ack_sent);
3032 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " OUT: %u/%u\n",
3033 fc->last_pid_sent, fc->last_ack_recv);
3034 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " QUEUE: %u/%u\n",
3035 fc->queue_n, fc->queue_max);
3039 connection_debug (struct MeshConnection *c)
3043 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "*** DEBUG NULL CONNECTION ***\n");
3046 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Connection %s:%X\n",
3047 peer2s (c->t->peer), GNUNET_h2s (&c->id));
3048 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " state: %u, pending msgs: %u\n",
3049 c->state, c->pending_messages);
3050 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " FWD FC\n");
3051 fc_debug (&c->fwd_fc);
3052 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " BCK FC\n");
3053 fc_debug (&c->bck_fc);
3058 static struct MeshChannel *
3059 channel_get (struct MeshTunnel2 *t, MESH_ChannelNumber chid)
3061 struct MeshChannel *ch;
3066 for (ch = t->channel_head; NULL != ch; ch = ch->next)
3068 if (ch->gid == chid)
3077 * Change the tunnel state.
3079 * @param t Tunnel whose state to change.
3080 * @param state New state.
3083 tunnel_change_state (struct MeshTunnel2* t, enum MeshTunnelState state)
3087 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3088 "Tunnel %s state was %s\n",
3090 GNUNET_MESH_DEBUG_TS2S (t->state));
3091 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3092 "Tunnel %s state is now %s\n",
3094 GNUNET_MESH_DEBUG_TS2S (state));
3100 * Cache a message to be sent once tunnel is online.
3102 * @param t Tunnel to hold the message.
3103 * @param ch Channel the message is about.
3104 * @param msg Message itself (copy will be made).
3105 * @param fwd Is this fwd?
3108 tunnel_queue_data (struct MeshTunnel2 *t,
3109 struct MeshChannel *ch,
3110 struct GNUNET_MessageHeader *msg,
3113 struct MeshTunnelQueue *tq;
3114 uint16_t size = ntohs (msg->size);
3116 tq = GNUNET_malloc (sizeof (struct MeshTunnelQueue) + size);
3119 memcpy (&tq[1], msg, size);
3120 GNUNET_CONTAINER_DLL_insert_tail (t->tq_head, t->tq_tail, tq);
3125 * Send all cached messages that we can, tunnel is online.
3127 * @param t Tunnel that holds the messages.
3128 * @param fwd Is this fwd?
3131 tunnel_send_queued_data (struct MeshTunnel2 *t, int fwd)
3133 struct MeshTunnelQueue *tq;
3134 struct MeshTunnelQueue *next;
3137 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3138 "tunnel_send_queued_data on tunnel %s\n",
3140 room = tunnel_get_buffer (t, fwd);
3141 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " buffer space: %u\n", room);
3142 for (tq = t->tq_head; NULL != tq && room > 0; tq = next)
3146 GNUNET_CONTAINER_DLL_remove (t->tq_head, t->tq_tail, tq);
3147 send_prebuilt_message_channel ((struct GNUNET_MessageHeader *) &tq[1],
3156 connection_change_state (struct MeshConnection* c,
3157 enum MeshConnectionState state)
3159 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3160 "Connection %s state was %s\n",
3161 GNUNET_h2s (&c->id), GNUNET_MESH_DEBUG_CS2S (c->state));
3162 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3163 "Connection %s state is now %s\n",
3164 GNUNET_h2s (&c->id), GNUNET_MESH_DEBUG_CS2S (state));
3170 * Add a client to a channel, initializing all needed data structures.
3172 * @param ch Channel to which add the client.
3173 * @param c Client which to add to the channel.
3176 channel_add_client (struct MeshChannel *ch, struct MeshClient *c)
3178 struct MeshTunnel2 *t = ch->t;
3180 if (NULL != ch->dest)
3186 /* Assign local id as destination */
3187 while (NULL != channel_get_by_local_id (c, t->next_local_chid))
3188 t->next_local_chid = (t->next_local_chid + 1) | GNUNET_MESH_LOCAL_CHANNEL_ID_SERV;
3189 ch->lid_dest = t->next_local_chid++;
3190 t->next_local_chid = t->next_local_chid | GNUNET_MESH_LOCAL_CHANNEL_ID_SERV;
3192 /* Store in client's hashmap */
3194 GNUNET_CONTAINER_multihashmap32_put (c->incoming_channels,
3196 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST))
3202 GNUNET_break (NULL == ch->dest_rel);
3203 ch->dest_rel = GNUNET_new (struct MeshChannelReliability);
3204 ch->dest_rel->ch = ch;
3205 ch->dest_rel->expected_delay = MESH_RETRANSMIT_TIME;
3211 static struct MeshConnection *
3212 tunnel_use_path (struct MeshTunnel2 *t, struct MeshPeerPath *p)
3214 struct MeshConnection *c;
3215 struct GNUNET_HashCode cid;
3216 struct MeshPeer *peer;
3217 unsigned int own_pos;
3219 GNUNET_CRYPTO_hash_create_random (GNUNET_CRYPTO_QUALITY_NONCE, &cid);
3221 c = connection_new (&cid);
3223 for (own_pos = 0; own_pos < p->length; own_pos++)
3225 if (p->peers[own_pos] == myid)
3228 if (own_pos > p->length - 1)
3231 connection_destroy (c);
3234 c->own_pos = own_pos;
3239 c->fwd_maintenance_task =
3240 GNUNET_SCHEDULER_add_delayed (refresh_connection_time,
3241 &connection_fwd_keepalive, c);
3244 peer = connection_get_next_hop (c);
3245 if (NULL == peer->connections)
3247 connection_destroy (c);
3250 GNUNET_CONTAINER_multihashmap_put (peer->connections, &c->id, c,
3251 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST);
3252 peer = connection_get_prev_hop (c);
3253 if (NULL == peer->connections)
3255 connection_destroy (c);
3258 GNUNET_CONTAINER_multihashmap_put (peer->connections, &c->id, c,
3259 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST);
3265 * Notifies a tunnel that a connection has broken that affects at least
3266 * some of its peers. Sends a notification towards the root of the tree.
3267 * In case the peer is the owner of the tree, notifies the client that owns
3268 * the tunnel and tries to reconnect.
3270 * FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME
3272 * @param t Tunnel affected.
3273 * @param p1 Peer that got disconnected from p2.
3274 * @param p2 Peer that got disconnected from p1.
3276 * @return Short ID of the peer disconnected (either p1 or p2).
3277 * 0 if the tunnel remained unaffected.
3279 static GNUNET_PEER_Id
3280 tunnel_notify_connection_broken (struct MeshTunnel2* t,
3281 GNUNET_PEER_Id p1, GNUNET_PEER_Id p2)
3283 // if (myid != p1 && myid != p2) FIXME
3288 // if (tree_get_predecessor (t->tree) != 0)
3290 // /* We are the peer still connected, notify owner of the disconnection. */
3291 // struct GNUNET_MESH_PathBroken msg;
3292 // struct GNUNET_PeerIdentity neighbor;
3294 // msg.header.size = htons (sizeof (msg));
3295 // msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_BROKEN);
3296 // GNUNET_PEER_resolve (t->id.oid, &msg.oid);
3297 // msg.tid = htonl (t->id.tid);
3298 // msg.peer1 = my_full_id;
3299 // GNUNET_PEER_resolve (pid, &msg.peer2);
3300 // GNUNET_PEER_resolve (tree_get_predecessor (t->tree), &neighbor);
3301 // send_prebuilt_message (&msg.header, &neighbor, t);
3308 * Send an end-to-end ACK message for the most recent in-sequence payload.
3310 * If channel is not reliable, do nothing.
3312 * @param ch Channel this is about.
3313 * @param fwd Is for FWD traffic? (ACK dest->owner)
3316 channel_send_data_ack (struct MeshChannel *ch, int fwd)
3318 struct GNUNET_MESH_DataACK msg;
3319 struct MeshChannelReliability *rel;
3320 struct MeshReliableMessage *copy;
3325 if (GNUNET_NO == ch->reliable)
3329 rel = fwd ? ch->dest_rel : ch->root_rel;
3330 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3331 "send_data_ack for %u\n",
3334 type = GNUNET_MESSAGE_TYPE_MESH_DATA_ACK;
3335 msg.header.type = htons (type);
3336 msg.header.size = htons (sizeof (msg));
3337 msg.chid = htonl (ch->gid);
3338 msg.mid = htonl (rel->mid_recv - 1);
3340 for (copy = rel->head_recv; NULL != copy; copy = copy->next)
3342 if (copy->type != type)
3344 delta = copy->mid - rel->mid_recv;
3347 mask = 0x1LL << delta;
3348 msg.futures |= mask;
3349 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3350 " setting bit for %u (delta %u) (%llX) -> %llX\n",
3351 copy->mid, delta, mask, msg.futures);
3353 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " final futures %llX\n", msg.futures);
3355 send_prebuilt_message_channel (&msg.header, ch, fwd);
3356 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "send_data_ack END\n");
3361 * Send an ACK informing the predecessor about the available buffer space.
3363 * Note that for fwd ack, the FWD mean forward *traffic* (root->dest),
3364 * the ACK itself goes "back" (dest->root).
3366 * @param c Connection on which to send the ACK.
3367 * @param buffer How much space free to advertise?
3368 * @param fwd Is this FWD ACK? (Going dest->owner)
3371 connection_send_ack (struct MeshConnection *c, unsigned int buffer, int fwd)
3373 struct MeshFlowControl *next_fc;
3374 struct MeshFlowControl *prev_fc;
3375 struct GNUNET_MESH_ACK msg;
3379 next_fc = fwd ? &c->fwd_fc : &c->bck_fc;
3380 prev_fc = fwd ? &c->bck_fc : &c->fwd_fc;
3382 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3383 "connection send %s ack on %s\n",
3384 fwd ? "FWD" : "BCK", GNUNET_h2s (&c->id));
3386 /* Check if we need to transmit the ACK */
3387 if (prev_fc->last_ack_sent - prev_fc->last_pid_recv > 3)
3389 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Not sending ACK, buffer > 3\n");
3390 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3391 " last pid recv: %u, last ack sent: %u\n",
3392 prev_fc->last_pid_recv, prev_fc->last_ack_sent);
3396 /* Ok, ACK might be necessary, what PID to ACK? */
3397 delta = next_fc->queue_max - next_fc->queue_n;
3398 ack = prev_fc->last_pid_recv + delta;
3399 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ACK %u\n", ack);
3400 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3401 " last pid %u, last ack %u, qmax %u, q %u\n",
3402 prev_fc->last_pid_recv, prev_fc->last_ack_sent,
3403 next_fc->queue_max, next_fc->queue_n);
3404 if (ack == prev_fc->last_ack_sent)
3406 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Not sending FWD ACK, not needed\n");
3410 prev_fc->last_ack_sent = ack;
3412 /* Build ACK message and send on connection */
3413 msg.header.size = htons (sizeof (msg));
3414 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_ACK);
3415 msg.ack = htonl (ack);
3418 send_prebuilt_message_connection (&msg.header, c, NULL, !fwd);
3423 * Modify the mesh message TID from global to local and send to client.
3425 * @param ch Channel on which to send the message.
3426 * @param msg Message to modify and send.
3427 * @param c Client to send to.
3428 * @param tid Tunnel ID to use (c can be both owner and client).
3431 channel_send_client_to_tid (struct MeshChannel *ch,
3432 const struct GNUNET_MESH_Data *msg,
3433 struct MeshClient *c, MESH_ChannelNumber id)
3435 struct GNUNET_MESH_LocalData *copy;
3436 uint16_t size = ntohs (msg->header.size) - sizeof (struct GNUNET_MESH_Data);
3437 char cbuf[size + sizeof (struct GNUNET_MESH_LocalData)];
3439 if (size < sizeof (struct GNUNET_MessageHeader))
3441 GNUNET_break_op (0);
3449 copy = (struct GNUNET_MESH_LocalData *) cbuf;
3450 memcpy (©[1], &msg[1], size);
3451 copy->header.size = htons (sizeof (struct GNUNET_MESH_LocalData) + size);
3452 copy->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_DATA);
3453 copy->id = htonl (id);
3454 GNUNET_SERVER_notification_context_unicast (nc, c->handle,
3455 ©->header, GNUNET_NO);
3460 * We have received a message out of order, or the client is not ready.
3461 * Buffer it until we receive an ACK from the client or the missing
3462 * message from the channel.
3464 * @param msg Message to buffer (MUST be of type MESH_DATA).
3465 * @param rel Reliability data to the corresponding direction.
3468 channel_rel_add_buffered_data (const struct GNUNET_MESH_Data *msg,
3469 struct MeshChannelReliability *rel)
3471 struct MeshReliableMessage *copy;
3472 struct MeshReliableMessage *prev;
3476 size = ntohs (msg->header.size);
3477 mid = ntohl (msg->mid);
3479 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "add_buffered_data %u\n", mid);
3481 copy = GNUNET_malloc (sizeof (*copy) + size);
3484 memcpy (©[1], msg, size);
3488 // FIXME do something better than O(n), although n < 64...
3489 // FIXME start from the end (most messages are the latest ones)
3490 for (prev = rel->head_recv; NULL != prev; prev = prev->next)
3492 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " prev %u\n", prev->mid);
3493 if (GMC_is_pid_bigger (prev->mid, mid))
3495 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " bingo!\n");
3496 GNUNET_CONTAINER_DLL_insert_before (rel->head_recv, rel->tail_recv,
3501 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " insert at tail!\n");
3502 GNUNET_CONTAINER_DLL_insert_tail (rel->head_recv, rel->tail_recv, copy);
3503 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "add_buffered_data END\n");
3508 channel_send_client_data (struct MeshChannel *ch,
3509 const struct GNUNET_MESH_Data *msg,
3514 if (ch->dest_rel->client_ready)
3515 channel_send_client_to_tid (ch, msg, ch->dest, ch->lid_dest);
3517 channel_rel_add_buffered_data (msg, ch->dest_rel);
3521 if (ch->root_rel->client_ready)
3522 channel_send_client_to_tid (ch, msg, ch->root, ch->lid_root);
3524 channel_rel_add_buffered_data (msg, ch->root_rel);
3530 * Send a buffered message to the client, for in order delivery or
3531 * as result of client ACK.
3533 * @param ch Channel on which to empty the message buffer.
3534 * @param c Client to send to.
3535 * @param rel Reliability structure to corresponding peer.
3536 * If rel == bck_rel, this is FWD data.
3539 channel_send_client_buffered_data (struct MeshChannel *ch,
3540 struct MeshClient *c,
3543 struct MeshReliableMessage *copy;
3544 struct MeshChannelReliability *rel;
3546 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "send_buffered_data\n");
3547 rel = fwd ? ch->dest_rel : ch->root_rel;
3548 if (GNUNET_NO == rel->client_ready)
3550 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "client not ready\n");
3554 copy = rel->head_recv;
3555 /* We never buffer channel management messages */
3558 if (copy->mid == rel->mid_recv || GNUNET_NO == ch->reliable)
3560 struct GNUNET_MESH_Data *msg = (struct GNUNET_MESH_Data *) ©[1];
3562 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3563 " have %u! now expecting %u\n",
3564 copy->mid, rel->mid_recv + 1);
3565 channel_send_client_data (ch, msg, fwd);
3568 GNUNET_CONTAINER_DLL_remove (rel->head_recv, rel->tail_recv, copy);
3573 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3574 " reliable && don't have %u, next is %u\n",
3580 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "send_buffered_data END\n");
3585 * Destroy a reliable message after it has been acknowledged, either by
3586 * direct mid ACK or bitfield. Updates the appropriate data structures and
3587 * timers and frees all memory.
3589 * @param copy Message that is no longer needed: remote peer got it.
3592 rel_message_free (struct MeshReliableMessage *copy)
3594 struct MeshChannelReliability *rel;
3595 struct GNUNET_TIME_Relative time;
3598 time = GNUNET_TIME_absolute_get_duration (copy->timestamp);
3599 rel->expected_delay.rel_value_us *= 7;
3600 rel->expected_delay.rel_value_us += time.rel_value_us;
3601 rel->expected_delay.rel_value_us /= 8;
3603 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! Freeing %u\n", copy->mid);
3604 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " n_sent %u\n", rel->n_sent);
3605 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! took %s\n",
3606 GNUNET_STRINGS_relative_time_to_string (time, GNUNET_NO));
3607 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! new expected delay %s\n",
3608 GNUNET_STRINGS_relative_time_to_string (rel->expected_delay,
3610 rel->retry_timer = rel->expected_delay;
3611 GNUNET_CONTAINER_DLL_remove (rel->head_sent, rel->tail_sent, copy);
3617 * Destroy all reliable messages queued for a channel,
3618 * during a channel destruction.
3619 * Frees the reliability structure itself.
3621 * @param rel Reliability data for a channel.
3624 channel_rel_free_all (struct MeshChannelReliability *rel)
3626 struct MeshReliableMessage *copy;
3627 struct MeshReliableMessage *next;
3632 for (copy = rel->head_recv; NULL != copy; copy = next)
3635 GNUNET_CONTAINER_DLL_remove (rel->head_recv, rel->tail_recv, copy);
3638 for (copy = rel->head_sent; NULL != copy; copy = next)
3641 GNUNET_CONTAINER_DLL_remove (rel->head_sent, rel->tail_sent, copy);
3644 if (GNUNET_SCHEDULER_NO_TASK != rel->retry_task)
3645 GNUNET_SCHEDULER_cancel (rel->retry_task);
3651 * Mark future messages as ACK'd.
3653 * @param rel Reliability data.
3654 * @param msg DataACK message with a bitfield of future ACK'd messages.
3657 channel_rel_free_sent (struct MeshChannelReliability *rel,
3658 const struct GNUNET_MESH_DataACK *msg)
3660 struct MeshReliableMessage *copy;
3661 struct MeshReliableMessage *next;
3668 bitfield = msg->futures;
3669 mid = ntohl (msg->mid);
3670 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3671 "free_sent_reliable %u %llX\n",
3673 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3674 " rel %p, head %p\n",
3675 rel, rel->head_sent);
3676 for (i = 0, copy = rel->head_sent;
3677 i < 64 && NULL != copy && 0 != bitfield;
3680 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3681 " trying bit %u (mid %u)\n",
3684 if (0 == (bitfield & mask))
3687 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " set!\n");
3688 /* Bit was set, clear the bit from the bitfield */
3691 /* The i-th bit was set. Do we have that copy? */
3692 /* Skip copies with mid < target */
3693 target = mid + i + 1;
3694 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " target %u\n", target);
3695 while (NULL != copy && GMC_is_pid_bigger (target, copy->mid))
3698 /* Did we run out of copies? (previously freed, it's ok) */
3701 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "run out of copies...\n");
3705 /* Did we overshoot the target? (previously freed, it's ok) */
3706 if (GMC_is_pid_bigger (copy->mid, target))
3708 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " next copy %u\n", copy->mid);
3712 /* Now copy->mid == target, free it */
3714 rel_message_free (copy);
3717 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "free_sent_reliable END\n");
3722 * We haven't received an ACK after a certain time: restransmit the message.
3724 * @param cls Closure (MeshReliableMessage with the message to restransmit)
3725 * @param tc TaskContext.
3728 channel_retransmit_message (void *cls,
3729 const struct GNUNET_SCHEDULER_TaskContext *tc)
3731 struct MeshChannelReliability *rel = cls;
3732 struct MeshReliableMessage *copy;
3733 struct MeshPeerQueue *q;
3734 struct MeshChannel *ch;
3735 struct MeshConnection *c;
3736 struct GNUNET_MESH_Data *payload;
3737 struct MeshPeer *hop;
3740 rel->retry_task = GNUNET_SCHEDULER_NO_TASK;
3741 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
3745 copy = rel->head_sent;
3752 /* Search the message to be retransmitted in the outgoing queue.
3753 * Check only the queue for the connection that is going to be used,
3754 * if the message is stuck in some other connection's queue we shouldn't
3756 * - cancelling it and sending the new one doesn't guarantee it's delivery,
3757 * the old connection could be temporary stalled or the queue happened to
3758 * be long at time of insertion.
3759 * - not sending the new one could cause terrible delays the old connection
3762 payload = (struct GNUNET_MESH_Data *) ©[1];
3763 fwd = (rel == ch->root_rel);
3764 c = tunnel_get_connection (ch->t, fwd);
3765 hop = connection_get_hop (c, fwd);
3766 for (q = hop->queue_head; NULL != q; q = q->next)
3768 if (ntohs (payload->header.type) == q->type && ch == q->ch)
3770 struct GNUNET_MESH_Data *queued_data = q->cls;
3772 if (queued_data->mid == payload->mid)
3777 /* Message not found in the queue that we are going to use. */
3780 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! RETRANSMIT %u\n", copy->mid);
3782 send_prebuilt_message_channel (&payload->header, ch, fwd);
3783 GNUNET_STATISTICS_update (stats, "# data retransmitted", 1, GNUNET_NO);
3787 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! ALREADY IN QUEUE %u\n", copy->mid);
3790 rel->retry_timer = GNUNET_TIME_STD_BACKOFF (rel->retry_timer);
3791 rel->retry_task = GNUNET_SCHEDULER_add_delayed (rel->retry_timer,
3792 &channel_retransmit_message,
3798 * Send ACK on one or more connections due to buffer space to the client.
3800 * Iterates all connections of the tunnel and sends ACKs appropriately.
3802 * @param ch Channel which has some free buffer space.
3803 * @param fwd Is this in for FWD traffic? (ACK goes dest->root)
3806 channel_send_connections_ack (struct MeshChannel *ch,
3807 unsigned int buffer,
3810 struct MeshTunnel2 *t = ch->t;
3811 struct MeshConnection *c;
3812 struct MeshFlowControl *fc;
3815 uint32_t allow_per_connection;
3818 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3819 "Channel send connection %s ack on %s:%X\n",
3820 fwd ? "FWD" : "BCK", peer2s (ch->t->peer), ch->gid);
3822 /* Count connections, how many messages are already allowed */
3823 for (cs = 0, allowed = 0, c = t->connection_head; NULL != c; c = c->next)
3825 fc = fwd ? &c->fwd_fc : &c->bck_fc;
3826 if (GMC_is_pid_bigger(fc->last_pid_recv, fc->last_ack_sent))
3831 allowed += fc->last_ack_sent - fc->last_pid_recv;
3835 /* Make sure there is no overflow */
3836 if (allowed > buffer)
3842 /* Authorize connections to send more data */
3843 to_allow = buffer - allowed;
3845 for (c = t->connection_head; NULL != c && to_allow > 0; c = c->next)
3847 allow_per_connection = to_allow/cs;
3848 to_allow -= allow_per_connection;
3850 fc = fwd ? &c->fwd_fc : &c->bck_fc;
3851 if (fc->last_ack_sent - fc->last_pid_recv > 64 / 3)
3855 connection_send_ack (c, allow_per_connection, fwd);
3858 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3859 "Channel send connection %s ack on %s:%X\n",
3860 fwd ? "FWD" : "BCK", peer2s (ch->t->peer), ch->gid);
3861 GNUNET_break (to_allow == 0);
3866 * Send an ACK on the appropriate connection/channel, depending on
3867 * the direction and the position of the peer.
3869 * @param c Which connection to send the hop-by-hop ACK.
3870 * @param ch Channel, if any.
3871 * @param fwd Is this a fwd ACK? (will go dest->root)
3874 send_ack (struct MeshConnection *c, struct MeshChannel *ch, int fwd)
3876 unsigned int buffer;
3878 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3879 "send ack %s on %p %p\n",
3880 fwd ? "FWD" : "BCK", c, ch);
3881 if (NULL == c || connection_is_terminal (c, fwd))
3883 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " getting from Channel\n");
3884 buffer = tunnel_get_buffer (NULL == c ? ch->t : c->t, fwd);
3888 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " getting from Connection\n");
3889 GNUNET_assert (NULL != c);
3890 buffer = connection_get_buffer (c, fwd);
3892 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " buffer available: %u\n", buffer);
3896 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " sending on all connections\n");
3897 GNUNET_assert (NULL != ch);
3898 channel_send_connections_ack (ch, buffer, fwd);
3900 else if (connection_is_origin (c, fwd))
3902 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " sending on channel...\n");
3905 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " really sending!\n");
3906 GNUNET_assert (NULL != ch);
3907 send_local_ack (ch, fwd);
3912 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " sending on connection\n");
3913 connection_send_ack (c, buffer, fwd);
3919 * Channel was ACK'd by remote peer, mark as ready and cancel retransmission.
3921 * @param ch Channel to mark as ready.
3922 * @param fwd Was the CREATE message sent fwd?
3925 channel_confirm (struct MeshChannel *ch, int fwd)
3927 struct MeshChannelReliability *rel;
3928 struct MeshReliableMessage *copy;
3929 struct MeshReliableMessage *next;
3931 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3932 " channel confirm %s %s:%X\n",
3933 fwd ? "FWD" : "BCK", peer2s (ch->t->peer), ch->gid);
3934 ch->state = MESH_CHANNEL_READY;
3936 rel = fwd ? ch->root_rel : ch->dest_rel;
3937 for (copy = rel->head_sent; NULL != copy; copy = next)
3939 struct GNUNET_MessageHeader *msg;
3942 msg = (struct GNUNET_MessageHeader *) ©[1];
3943 if (ntohs (msg->type) == GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE)
3945 rel_message_free (copy);
3949 if (GNUNET_NO == rel->client_ready)
3950 send_local_ack (ch, fwd);
3955 * Save a copy to retransmit in case it gets lost.
3957 * Initializes all needed callbacks and timers.
3959 * @param ch Channel this message goes on.
3960 * @param msg Message to copy.
3961 * @param fwd Is this fwd traffic?
3964 channel_save_copy (struct MeshChannel *ch,
3965 const struct GNUNET_MessageHeader *msg,
3968 struct MeshChannelReliability *rel;
3969 struct MeshReliableMessage *copy;
3974 rel = fwd ? ch->root_rel : ch->dest_rel;
3975 mid = rel->mid_send;
3976 type = ntohs (msg->type);
3977 size = ntohs (msg->size);
3979 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! SAVE %u\n", mid);
3980 copy = GNUNET_malloc (sizeof (struct MeshReliableMessage) + size);
3982 copy->timestamp = GNUNET_TIME_absolute_get ();
3985 memcpy (©[1], msg, size);
3987 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " n_sent %u\n", rel->n_sent);
3988 GNUNET_CONTAINER_DLL_insert_tail (rel->head_sent, rel->tail_sent, copy);
3989 if (GNUNET_SCHEDULER_NO_TASK == rel->retry_task)
3992 GNUNET_TIME_relative_multiply (rel->expected_delay,
3993 MESH_RETRANSMIT_MARGIN);
3995 GNUNET_SCHEDULER_add_delayed (rel->retry_timer,
3996 &channel_retransmit_message,
4003 * Send keepalive packets for a connection.
4005 * @param c Connection to keep alive..
4006 * @param fwd Is this a FWD keepalive? (owner -> dest).
4009 connection_keepalive (struct MeshConnection *c, int fwd)
4011 struct GNUNET_MESH_ConnectionKeepAlive *msg;
4012 size_t size = sizeof (struct GNUNET_MESH_ConnectionKeepAlive);
4016 type = fwd ? GNUNET_MESSAGE_TYPE_MESH_FWD_KEEPALIVE :
4017 GNUNET_MESSAGE_TYPE_MESH_BCK_KEEPALIVE;
4019 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4020 "sending %s keepalive for connection %s[%d]\n",
4021 fwd ? "FWD" : "BCK",
4022 peer2s (c->t->peer),
4025 msg = (struct GNUNET_MESH_ConnectionKeepAlive *) cbuf;
4026 msg->header.size = htons (size);
4027 msg->header.type = htons (type);
4030 send_prebuilt_message_connection (&msg->header, c, NULL, fwd);
4035 * Send CONNECTION_{CREATE/ACK} packets for a connection.
4037 * @param c Connection for which to send the message.
4038 * @param fwd If GNUNET_YES, send CREATE, otherwise send ACK.
4041 connection_recreate (struct MeshConnection *c, int fwd)
4043 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "sending connection recreate\n");
4045 send_connection_create (c);
4047 send_connection_ack (c, GNUNET_NO);
4052 * Generic connection timer management.
4053 * Depending on the role of the peer in the connection will send the
4054 * appropriate message (build or keepalive)
4056 * @param c Conncetion to maintain.
4057 * @param fwd Is FWD?
4060 connection_maintain (struct MeshConnection *c, int fwd)
4062 if (MESH_TUNNEL_SEARCHING == c->t->state)
4064 /* TODO DHT GET with RO_BART */
4069 case MESH_CONNECTION_NEW:
4071 case MESH_CONNECTION_SENT:
4072 connection_recreate (c, fwd);
4074 case MESH_CONNECTION_READY:
4075 connection_keepalive (c, fwd);
4084 connection_fwd_keepalive (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
4086 struct MeshConnection *c = cls;
4088 c->fwd_maintenance_task = GNUNET_SCHEDULER_NO_TASK;
4089 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
4092 connection_maintain (c, GNUNET_YES);
4093 c->fwd_maintenance_task = GNUNET_SCHEDULER_add_delayed (refresh_connection_time,
4094 &connection_fwd_keepalive,
4100 connection_bck_keepalive (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
4102 struct MeshConnection *c = cls;
4104 c->bck_maintenance_task = GNUNET_SCHEDULER_NO_TASK;
4105 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
4108 connection_maintain (c, GNUNET_NO);
4109 c->bck_maintenance_task = GNUNET_SCHEDULER_add_delayed (refresh_connection_time,
4110 &connection_bck_keepalive,
4116 * Send a message to all peers in this connection that the connection
4117 * is no longer valid.
4119 * If some peer should not receive the message, it should be zero'ed out
4120 * before calling this function.
4122 * @param c The connection whose peers to notify.
4125 connection_send_destroy (struct MeshConnection *c)
4127 struct GNUNET_MESH_ConnectionDestroy msg;
4129 msg.header.size = htons (sizeof (msg));
4130 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY);;
4132 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4133 " sending connection destroy for connection %s[%X]\n",
4134 peer2s (c->t->peer),
4137 if (GNUNET_NO == connection_is_terminal (c, GNUNET_YES))
4138 send_prebuilt_message_connection (&msg.header, c, NULL, GNUNET_YES);
4139 if (GNUNET_NO == connection_is_terminal (c, GNUNET_NO))
4140 send_prebuilt_message_connection (&msg.header, c, NULL, GNUNET_NO);
4141 c->destroy = GNUNET_YES;
4146 * Confirm we got a channel create.
4148 * @param ch The channel to confirm.
4149 * @param fwd Should we send the ACK fwd?
4152 channel_send_ack (struct MeshChannel *ch, int fwd)
4154 struct GNUNET_MESH_ChannelManage msg;
4156 msg.header.size = htons (sizeof (msg));
4157 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CHANNEL_ACK);
4158 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4159 " sending channel ack for channel %s:%X\n",
4160 peer2s (ch->t->peer),
4163 msg.chid = htonl (ch->gid);
4164 send_prebuilt_message_channel (&msg.header, ch, fwd);
4169 * Send a message to all clients (local and remote) of this channel
4170 * notifying that the channel is no longer valid.
4172 * If some peer or client should not receive the message,
4173 * should be zero'ed out before calling this function.
4175 * @param ch The channel whose clients to notify.
4178 channel_send_destroy (struct MeshChannel *ch)
4180 struct GNUNET_MESH_ChannelManage msg;
4182 msg.header.size = htons (sizeof (msg));
4183 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY);
4184 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4185 " sending channel destroy for channel %s:%X\n",
4186 peer2s (ch->t->peer),
4189 if (channel_is_terminal (ch, GNUNET_NO))
4191 if (NULL != ch->root && GNUNET_NO == ch->root->shutting_down)
4193 msg.chid = htonl (ch->lid_root);
4194 send_local_channel_destroy (ch, GNUNET_NO);
4199 msg.chid = htonl (ch->gid);
4200 send_prebuilt_message_channel (&msg.header, ch, GNUNET_NO);
4203 if (channel_is_terminal (ch, GNUNET_YES))
4205 if (NULL != ch->dest && GNUNET_NO == ch->dest->shutting_down)
4207 msg.chid = htonl (ch->lid_dest);
4208 send_local_channel_destroy (ch, GNUNET_YES);
4213 msg.chid = htonl (ch->gid);
4214 send_prebuilt_message_channel (&msg.header, ch, GNUNET_YES);
4222 static struct MeshTunnel2 *
4225 struct MeshTunnel2 *t;
4227 t = GNUNET_new (struct MeshTunnel2);
4229 t->next_local_chid = GNUNET_MESH_LOCAL_CHANNEL_ID_SERV;
4231 // GNUNET_CONTAINER_multihashmap_put (tunnels, tid, t,
4232 // GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST))
4234 // GNUNET_break (0);
4235 // tunnel_destroy (t);
4239 // char salt[] = "salt";
4240 // GNUNET_CRYPTO_kdf (&t->e_key, sizeof (struct GNUNET_CRYPTO_AesSessionKey),
4241 // salt, sizeof (salt),
4242 // &t->e_key, sizeof (struct GNUNET_CRYPTO_AesSessionKey),
4243 // &my_full_id, sizeof (struct GNUNET_PeerIdentity),
4244 // GNUNET_PEER_resolve2 (t->peer->id), sizeof (struct GNUNET_PeerIdentity),
4246 // GNUNET_CRYPTO_kdf (&t->d_key, sizeof (struct GNUNET_CRYPTO_AesSessionKey),
4247 // salt, sizeof (salt),
4248 // &t->d_key, sizeof (struct GNUNET_CRYPTO_AesSessionKey),
4249 // GNUNET_PEER_resolve2 (t->peer->id), sizeof (struct GNUNET_PeerIdentity),
4250 // &my_full_id, sizeof (struct GNUNET_PeerIdentity),
4258 * Add a connection to a tunnel.
4261 * @param c Connection.
4264 tunnel_add_connection (struct MeshTunnel2 *t, struct MeshConnection *c)
4266 struct MeshConnection *aux;
4268 for (aux = t->connection_head; aux != NULL; aux = aux->next)
4271 GNUNET_CONTAINER_DLL_insert_tail (t->connection_head, t->connection_tail, c);
4276 * Initialize a Flow Control structure to the initial state.
4278 * @param fc Flow Control structure to initialize.
4281 fc_init (struct MeshFlowControl *fc)
4284 fc->last_pid_sent = (uint32_t) -1; /* Next (expected) = 0 */
4285 fc->last_pid_recv = (uint32_t) -1;
4286 fc->last_ack_sent = (uint32_t) 0;
4287 fc->last_ack_recv = (uint32_t) 0;
4288 fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
4289 fc->poll_time = GNUNET_TIME_UNIT_SECONDS;
4291 fc->queue_max = (max_msgs_queue / max_connections) + 1;
4295 static struct MeshConnection *
4296 connection_new (const struct GNUNET_HashCode *cid)
4298 struct MeshConnection *c;
4300 c = GNUNET_new (struct MeshConnection);
4302 GNUNET_CONTAINER_multihashmap_put (connections, &c->id, c,
4303 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST);
4304 fc_init (&c->fwd_fc);
4305 fc_init (&c->bck_fc);
4314 * Find a connection.
4316 * @param cid Connection ID.
4318 static struct MeshConnection *
4319 connection_get (const struct GNUNET_HashCode *cid)
4321 return GNUNET_CONTAINER_multihashmap_get (connections, cid);
4326 connection_destroy (struct MeshConnection *c)
4328 struct MeshPeer *peer;
4333 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "destroying connection %s[%X]\n",
4334 peer2s (c->t->peer),
4337 /* Cancel all traffic */
4338 connection_cancel_queues (c, GNUNET_YES);
4339 connection_cancel_queues (c, GNUNET_NO);
4341 /* Cancel maintainance task (keepalive/timeout) */
4342 if (GNUNET_SCHEDULER_NO_TASK != c->fwd_maintenance_task)
4343 GNUNET_SCHEDULER_cancel (c->fwd_maintenance_task);
4344 if (GNUNET_SCHEDULER_NO_TASK != c->bck_maintenance_task)
4345 GNUNET_SCHEDULER_cancel (c->bck_maintenance_task);
4347 /* Deregister from neighbors */
4348 peer = connection_get_next_hop (c);
4350 GNUNET_CONTAINER_multihashmap_remove (peer->connections, &c->id, c);
4351 peer = connection_get_prev_hop (c);
4353 GNUNET_CONTAINER_multihashmap_remove (peer->connections, &c->id, c);
4356 GNUNET_STATISTICS_update (stats, "# connections", -1, GNUNET_NO);
4357 GNUNET_CONTAINER_DLL_remove (c->t->connection_head, c->t->connection_tail, c);
4363 tunnel_destroy (struct MeshTunnel2 *t)
4365 struct MeshConnection *c;
4366 struct MeshConnection *next;
4371 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "destroying tunnel %s\n",
4374 // if (GNUNET_YES != GNUNET_CONTAINER_multihashmap_remove (tunnels, &t->id, t))
4375 // GNUNET_break (0);
4377 for (c = t->connection_head; NULL != c; c = next)
4380 connection_destroy (c);
4383 GNUNET_STATISTICS_update (stats, "# tunnels", -1, GNUNET_NO);
4390 * Tunnel is empty: destroy it.
4392 * Notifies all connections about the destruction.
4394 * @param t Tunnel to destroy.
4397 tunnel_destroy_empty (struct MeshTunnel2 *t)
4399 struct MeshConnection *c;
4401 for (c = t->connection_head; NULL != c; c = c->next)
4403 if (GNUNET_NO == c->destroy)
4404 connection_send_destroy (c);
4407 if (0 == t->pending_messages)
4410 t->destroy = GNUNET_YES;
4415 * Destroy tunnel if empty (no more channels).
4417 * @param t Tunnel to destroy if empty.
4420 tunnel_destroy_if_empty (struct MeshTunnel2 *t)
4422 if (NULL != t->channel_head)
4425 tunnel_destroy_empty (t);
4430 * Destroy a channel and free all resources.
4432 * @param ch Channel to destroy.
4435 channel_destroy (struct MeshChannel *ch)
4437 struct MeshClient *c;
4445 if (GNUNET_YES != GNUNET_CONTAINER_multihashmap32_remove (c->own_channels,
4456 GNUNET_CONTAINER_multihashmap32_remove (c->incoming_channels,
4463 channel_rel_free_all (ch->root_rel);
4464 channel_rel_free_all (ch->dest_rel);
4466 GNUNET_CONTAINER_DLL_remove (ch->t->channel_head, ch->t->channel_tail, ch);
4467 GNUNET_STATISTICS_update (stats, "# channels", -1, GNUNET_NO);
4473 * Create a new channel.
4475 * @param t Tunnel this channel is in.
4476 * @param owner Client that owns the channel, NULL for foreign channels.
4477 * @param lid_root Local ID for root client.
4479 * @return A new initialized channel. NULL on error.
4481 static struct MeshChannel *
4482 channel_new (struct MeshTunnel2 *t,
4483 struct MeshClient *owner, MESH_ChannelNumber lid_root)
4485 struct MeshChannel *ch;
4487 ch = GNUNET_new (struct MeshChannel);
4489 ch->lid_root = lid_root;
4492 GNUNET_CONTAINER_DLL_insert (t->channel_head, t->channel_tail, ch);
4494 GNUNET_STATISTICS_update (stats, "# channels", 1, GNUNET_NO);
4498 while (NULL != channel_get (t, t->next_chid))
4499 t->next_chid = (t->next_chid + 1) & ~GNUNET_MESH_LOCAL_CHANNEL_ID_CLI;
4500 ch->gid = t->next_chid;
4501 t->next_chid = (t->next_chid + 1) & ~GNUNET_MESH_LOCAL_CHANNEL_ID_CLI;
4504 GNUNET_CONTAINER_multihashmap32_put (owner->own_channels, lid_root, ch,
4505 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
4508 channel_destroy (ch);
4509 GNUNET_SERVER_receive_done (owner->handle, GNUNET_SYSERR);
4519 * Set options in a channel, extracted from a bit flag field
4521 * @param ch Channel to set options to.
4522 * @param options Bit array in host byte order.
4525 channel_set_options (struct MeshChannel *ch, uint32_t options)
4527 ch->nobuffer = (options & GNUNET_MESH_OPTION_NOBUFFER) != 0 ?
4528 GNUNET_YES : GNUNET_NO;
4529 ch->reliable = (options & GNUNET_MESH_OPTION_RELIABLE) != 0 ?
4530 GNUNET_YES : GNUNET_NO;
4535 * Iterator for deleting each channel whose client endpoint disconnected.
4537 * @param cls Closure (client that has disconnected).
4538 * @param key The local channel id (used to access the hashmap).
4539 * @param value The value stored at the key (channel to destroy).
4541 * @return GNUNET_OK, keep iterating.
4544 channel_destroy_iterator (void *cls,
4548 struct MeshChannel *ch = value;
4549 struct MeshClient *c = cls;
4550 struct MeshTunnel2 *t;
4552 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4553 " Channel %X (%X / %X) destroy, due to client %u shutdown.\n",
4554 ch->gid, ch->lid_root, ch->lid_dest, c->id);
4558 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Client %u is destination.\n", c->id);
4562 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Client %u is owner.\n", c->id);
4566 channel_send_destroy (ch);
4567 channel_destroy (ch);
4568 tunnel_destroy_if_empty (t);
4575 * Remove client's ports from the global hashmap on disconnect.
4577 * @param cls Closure (unused).
4579 * @param value Client structure.
4581 * @return GNUNET_OK, keep iterating.
4584 client_release_ports (void *cls,
4590 res = GNUNET_CONTAINER_multihashmap32_remove (ports, key, value);
4591 if (GNUNET_YES != res)
4594 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
4595 "Port %u by client %p was not registered.\n",
4603 * Timeout function due to lack of keepalive/traffic from the owner.
4604 * Destroys connection if called.
4606 * @param cls Closure (connection to destroy).
4607 * @param tc TaskContext.
4610 connection_fwd_timeout (void *cls,
4611 const struct GNUNET_SCHEDULER_TaskContext *tc)
4613 struct MeshConnection *c = cls;
4615 c->fwd_maintenance_task = GNUNET_SCHEDULER_NO_TASK;
4616 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
4618 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4619 "Connection %s[%X] FWD timed out. Destroying.\n",
4620 peer2s (c->t->peer),
4623 if (connection_is_origin (c, GNUNET_YES)) /* If local, leave. */
4626 connection_destroy (c);
4631 * Timeout function due to lack of keepalive/traffic from the destination.
4632 * Destroys connection if called.
4634 * @param cls Closure (connection to destroy).
4635 * @param tc TaskContext
4638 connection_bck_timeout (void *cls,
4639 const struct GNUNET_SCHEDULER_TaskContext *tc)
4641 struct MeshConnection *c = cls;
4643 c->bck_maintenance_task = GNUNET_SCHEDULER_NO_TASK;
4644 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
4647 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4648 "Connection %s[%X] FWD timed out. Destroying.\n",
4649 peer2s (c->t->peer),
4652 if (connection_is_origin (c, GNUNET_NO)) /* If local, leave. */
4655 connection_destroy (c);
4660 * Resets the connection timeout task, some other message has done the
4662 * - For the first peer on the direction this means to send
4663 * a keepalive or a path confirmation message (either create or ACK).
4664 * - For all other peers, this means to destroy the connection,
4665 * due to lack of activity.
4666 * Starts the tiemout if no timeout was running (connection just created).
4668 * @param c Connection whose timeout to reset.
4669 * @param fwd Is this forward?
4671 * TODO use heap to improve efficiency of scheduler.
4674 connection_reset_timeout (struct MeshConnection *c, int fwd)
4676 GNUNET_SCHEDULER_TaskIdentifier *ti;
4677 GNUNET_SCHEDULER_Task f;
4679 ti = fwd ? &c->fwd_maintenance_task : &c->bck_maintenance_task;
4681 if (GNUNET_SCHEDULER_NO_TASK != *ti)
4682 GNUNET_SCHEDULER_cancel (*ti);
4684 if (connection_is_origin (c, fwd)) /* Endpoint */
4686 f = fwd ? &connection_fwd_keepalive : &connection_bck_keepalive;
4687 *ti = GNUNET_SCHEDULER_add_delayed (refresh_connection_time, f, c);
4691 struct GNUNET_TIME_Relative delay;
4693 delay = GNUNET_TIME_relative_multiply (refresh_connection_time, 4);
4694 f = fwd ? &connection_fwd_timeout : &connection_bck_timeout;
4695 *ti = GNUNET_SCHEDULER_add_delayed (delay, f, c);
4701 * Iterator to notify all connections of a broken link. Mark connections
4702 * to destroy after all traffic has been sent.
4704 * @param cls Closure (peer disconnected).
4705 * @param key Current key code (tid).
4706 * @param value Value in the hash map (connection).
4708 * @return GNUNET_YES if we should continue to iterate,
4712 connection_broken (void *cls,
4713 const struct GNUNET_HashCode *key,
4716 struct MeshPeer *peer = cls;
4717 struct MeshConnection *c = value;
4718 struct GNUNET_MESH_ConnectionBroken msg;
4721 fwd = peer == connection_get_prev_hop (c);
4723 if (connection_is_terminal (c, fwd))
4725 /* Local shutdown: no point in iterating anymore */
4726 connection_destroy (c);
4729 connection_cancel_queues (c, !fwd);
4731 msg.header.size = htons (sizeof (struct GNUNET_MESH_ConnectionBroken));
4732 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CONNECTION_BROKEN);
4734 msg.peer1 = my_full_id;
4735 msg.peer2 = *GNUNET_PEER_resolve2 (peer->id);
4736 send_prebuilt_message_connection (&msg.header, c, NULL, fwd);
4737 c->destroy = GNUNET_YES;
4742 /******************************************************************************/
4743 /**************** MESH NETWORK HANDLER HELPERS ***********************/
4744 /******************************************************************************/
4747 * Free a transmission that was already queued with all resources
4748 * associated to the request.
4750 * @param queue Queue handler to cancel.
4751 * @param clear_cls Is it necessary to free associated cls?
4754 queue_destroy (struct MeshPeerQueue *queue, int clear_cls)
4756 struct MeshPeer *peer;
4757 struct MeshFlowControl *fc;
4762 GNUNET_assert (NULL != queue->c);
4763 fc = fwd ? &queue->c->fwd_fc : &queue->c->bck_fc;
4765 if (GNUNET_YES == clear_cls)
4767 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " queue destroy type %s\n",
4768 GNUNET_MESH_DEBUG_M2S (queue->type));
4769 switch (queue->type)
4771 case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_DESTROY:
4772 case GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY:
4773 GNUNET_log (GNUNET_ERROR_TYPE_INFO, "destroying a DESTROY message\n");
4774 GNUNET_break (GNUNET_YES == queue->c->destroy);
4776 case GNUNET_MESSAGE_TYPE_MESH_FWD:
4777 case GNUNET_MESSAGE_TYPE_MESH_BCK:
4778 case GNUNET_MESSAGE_TYPE_MESH_ACK:
4779 case GNUNET_MESSAGE_TYPE_MESH_POLL:
4780 case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_ACK:
4781 case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_CREATE:
4782 case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_BROKEN:
4783 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " prebuilt message\n");;
4784 GNUNET_free_non_null (queue->cls);
4789 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, " type %s unknown!\n",
4790 GNUNET_MESH_DEBUG_M2S (queue->type));
4794 GNUNET_CONTAINER_DLL_remove (peer->queue_head, peer->queue_tail, queue);
4796 if (queue->type != GNUNET_MESSAGE_TYPE_MESH_ACK &&
4797 queue->type != GNUNET_MESSAGE_TYPE_MESH_POLL)
4799 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Q_N- %p %u, \n", fc, fc->queue_n);
4803 if (NULL != queue->c)
4805 queue->c->pending_messages--;
4806 if (NULL != queue->c->t)
4808 queue->c->t->pending_messages--;
4812 GNUNET_free (queue);
4817 queue_send (void *cls, size_t size, void *buf)
4819 struct MeshPeer *peer = cls;
4820 struct MeshFlowControl *fc;
4821 struct MeshConnection *c;
4822 struct GNUNET_MessageHeader *msg;
4823 struct MeshPeerQueue *queue;
4824 struct MeshTunnel2 *t;
4825 struct MeshChannel *ch;
4826 const struct GNUNET_PeerIdentity *dst_id;
4832 peer->core_transmit = NULL;
4833 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* Queue send (max %u)\n", size);
4835 if (NULL == buf || 0 == size)
4837 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* Buffer size 0.\n");
4842 queue = peer_get_first_message (peer);
4845 GNUNET_break (0); /* Core tmt_rdy should've been canceled */
4850 fc = fwd ? &c->fwd_fc : &c->bck_fc;
4853 dst_id = GNUNET_PEER_resolve2 (peer->id);
4854 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* towards %s\n", GNUNET_i2s (dst_id));
4855 /* Check if buffer size is enough for the message */
4856 if (queue->size > size)
4858 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* not enough room, reissue\n");
4859 peer->core_transmit =
4860 GNUNET_CORE_notify_transmit_ready (core_handle,
4863 GNUNET_TIME_UNIT_FOREVER_REL,
4870 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* size %u ok\n", queue->size);
4872 t = (NULL != c) ? c->t : NULL;
4876 switch (queue->type)
4878 case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_DESTROY:
4879 case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_BROKEN:
4880 case GNUNET_MESSAGE_TYPE_MESH_FWD:
4881 case GNUNET_MESSAGE_TYPE_MESH_BCK:
4882 case GNUNET_MESSAGE_TYPE_MESH_ACK:
4883 case GNUNET_MESSAGE_TYPE_MESH_POLL:
4884 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4886 GNUNET_MESH_DEBUG_M2S (queue->type));
4887 data_size = send_core_data_raw (queue->cls, size, buf);
4888 msg = (struct GNUNET_MessageHeader *) buf;
4889 type = ntohs (msg->type);
4891 case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_CREATE:
4892 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* path create\n");
4893 if (connection_is_origin (c, GNUNET_YES))
4894 data_size = send_core_connection_create (queue->c, size, buf);
4896 data_size = send_core_data_raw (queue->cls, size, buf);
4898 case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_ACK:
4899 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* path ack\n");
4900 if (connection_is_origin (c, GNUNET_NO))
4901 data_size = send_core_connection_ack (queue->c, size, buf);
4903 data_size = send_core_data_raw (queue->cls, size, buf);
4905 case GNUNET_MESSAGE_TYPE_MESH_DATA:
4906 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE:
4907 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY:
4908 /* This should be encapsulted */
4913 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "* type unknown: %u\n",
4918 if (0 < drop_percent &&
4919 GNUNET_CRYPTO_random_u32(GNUNET_CRYPTO_QUALITY_WEAK, 101) < drop_percent)
4921 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
4922 "Dropping message of type %s\n",
4923 GNUNET_MESH_DEBUG_M2S (queue->type));
4927 /* Free queue, but cls was freed by send_core_* */
4929 queue_destroy (queue, GNUNET_NO);
4931 /* Send ACK if needed, after accounting for sent ID in fc->queue_n */
4934 case GNUNET_MESSAGE_TYPE_MESH_FWD:
4935 case GNUNET_MESSAGE_TYPE_MESH_BCK:
4936 pid = ntohl ( ((struct GNUNET_MESH_Encrypted *) buf)->pid );
4937 fc->last_pid_sent = pid;
4938 send_ack (c, ch, fwd);
4944 /* If more data in queue, send next */
4945 queue = peer_get_first_message (peer);
4948 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* more data!\n");
4949 if (NULL == peer->core_transmit) {
4950 peer->core_transmit =
4951 GNUNET_CORE_notify_transmit_ready(core_handle,
4954 GNUNET_TIME_UNIT_FOREVER_REL,
4962 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4963 "* tmt rdy called somewhere else\n");
4965 if (GNUNET_SCHEDULER_NO_TASK == fc->poll_task)
4967 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* starting poll timeout\n");
4969 GNUNET_SCHEDULER_add_delayed (fc->poll_time, &connection_poll, fc);
4974 if (GNUNET_SCHEDULER_NO_TASK != fc->poll_task)
4976 GNUNET_SCHEDULER_cancel (fc->poll_task);
4977 fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
4982 c->pending_messages--;
4983 if (GNUNET_YES == c->destroy && 0 == c->pending_messages)
4985 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* destroying connection!\n");
4986 connection_destroy (c);
4992 t->pending_messages--;
4993 if (GNUNET_YES == t->destroy && 0 == t->pending_messages)
4995 // GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* destroying tunnel!\n");
4999 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* Return %d\n", data_size);
5005 queue_add (void *cls, uint16_t type, size_t size,
5006 struct MeshConnection *c,
5007 struct MeshChannel *ch,
5010 struct MeshPeerQueue *queue;
5011 struct MeshFlowControl *fc;
5012 struct MeshPeer *peer;
5015 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5016 "queue add %s %s (%u) on c %p, ch %p\n",
5017 fwd ? "FWD" : "BCK", GNUNET_MESH_DEBUG_M2S (type), size, c, ch);
5018 GNUNET_assert (NULL != c);
5020 fc = fwd ? &c->fwd_fc : &c->bck_fc;
5021 peer = fwd ? connection_get_next_hop (c) : connection_get_prev_hop (c);
5031 if (GNUNET_MESSAGE_TYPE_MESH_POLL == type ||
5032 GNUNET_MESSAGE_TYPE_MESH_ACK == type)
5037 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "priority %d\n", priority);
5038 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "fc %p\n", fc);
5039 if (fc->queue_n >= fc->queue_max && 0 == priority)
5041 GNUNET_STATISTICS_update (stats, "# messages dropped (buffer full)",
5044 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5045 "queue full: %u/%u\n",
5046 fc->queue_n, fc->queue_max);
5047 return; /* Drop this message */
5050 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "last pid %u\n", fc->last_pid_sent);
5051 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ack %u\n", fc->last_ack_recv);
5052 if (GMC_is_pid_bigger (fc->last_pid_sent + 1, fc->last_ack_recv) &&
5053 GNUNET_SCHEDULER_NO_TASK == fc->poll_task &&
5054 GNUNET_MESSAGE_TYPE_MESH_POLL != type)
5056 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5057 "no buffer space (%u > %u): starting poll\n",
5058 fc->last_pid_sent + 1, fc->last_ack_recv);
5059 fc->poll_task = GNUNET_SCHEDULER_add_delayed (fc->poll_time,
5063 queue = GNUNET_malloc (sizeof (struct MeshPeerQueue));
5071 if (100 <= priority)
5073 GNUNET_CONTAINER_DLL_insert (peer->queue_head, peer->queue_tail, queue);
5077 GNUNET_CONTAINER_DLL_insert_tail (peer->queue_head, peer->queue_tail, queue);
5078 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Q_N+ %p %u, \n", fc, fc->queue_n);
5083 if (NULL == peer->core_transmit)
5085 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5086 "calling core tmt rdy towards %s for %u bytes\n",
5087 peer2s (peer), size);
5088 peer->core_transmit =
5089 GNUNET_CORE_notify_transmit_ready (core_handle,
5092 GNUNET_TIME_UNIT_FOREVER_REL,
5093 GNUNET_PEER_resolve2 (peer->id),
5100 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5101 "core tmt rdy towards %s already called\n",
5105 c->pending_messages++;
5107 c->t->pending_messages++;
5111 /******************************************************************************/
5112 /******************** MESH NETWORK HANDLERS **************************/
5113 /******************************************************************************/
5117 * Generic handler for mesh network payload traffic.
5119 * @param t Tunnel on which we got this message.
5120 * @param message Unencryted data message.
5121 * @param fwd Is this FWD traffic? GNUNET_YES : GNUNET_NO;
5124 handle_data (struct MeshTunnel2 *t, const struct GNUNET_MESH_Data *msg, int fwd)
5126 struct MeshChannelReliability *rel;
5127 struct MeshChannel *ch;
5128 struct MeshClient *c;
5134 size = ntohs (msg->header.size);
5136 sizeof (struct GNUNET_MESH_Data) +
5137 sizeof (struct GNUNET_MessageHeader))
5142 type = ntohs (msg->header.type);
5143 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "got a %s message\n",
5144 GNUNET_MESH_DEBUG_M2S (type));
5145 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " payload of type %s\n",
5146 GNUNET_MESH_DEBUG_M2S (ntohs (msg[1].header.type)));
5149 ch = channel_get (t, ntohl (msg->chid));
5152 GNUNET_STATISTICS_update (stats, "# data on unknown channel", 1, GNUNET_NO);
5153 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "WARNING channel unknown\n");
5157 /* Initialize FWD/BCK data */
5158 c = fwd ? ch->dest : ch->root;
5159 rel = fwd ? ch->dest_rel : ch->root_rel;
5167 tunnel_change_state (t, MESH_TUNNEL_READY);
5169 GNUNET_STATISTICS_update (stats, "# data received", 1, GNUNET_NO);
5171 mid = ntohl (msg->mid);
5172 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " mid %u\n", mid);
5174 if (GNUNET_NO == ch->reliable ||
5175 ( !GMC_is_pid_bigger (rel->mid_recv, mid) &&
5176 GMC_is_pid_bigger (rel->mid_recv + 64, mid) ) )
5178 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! RECV %u\n", mid);
5179 if (GNUNET_YES == ch->reliable)
5181 /* Is this the exact next expected messasge? */
5182 if (mid == rel->mid_recv)
5184 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "as expected\n");
5186 channel_send_client_data (ch, msg, fwd);
5190 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "save for later\n");
5191 channel_rel_add_buffered_data (msg, rel);
5196 /* Tunnel is unreliable: send to clients directly */
5197 /* FIXME: accept Out Of Order traffic */
5198 rel->mid_recv = mid + 1;
5199 channel_send_client_data (ch, msg, fwd);
5204 GNUNET_break_op (0);
5205 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5206 " MID %u not expected (%u - %u), dropping!\n",
5207 mid, rel->mid_recv, rel->mid_recv + 64);
5210 channel_send_data_ack (ch, fwd);
5214 * Handler for mesh network traffic end-to-end ACKs.
5216 * @param t Tunnel on which we got this message.
5217 * @param message Data message.
5218 * @param fwd Is this a fwd ACK? (dest->orig)
5221 handle_data_ack (struct MeshTunnel2 *t,
5222 const struct GNUNET_MESH_DataACK *msg, int fwd)
5224 struct MeshChannelReliability *rel;
5225 struct MeshReliableMessage *copy;
5226 struct MeshReliableMessage *next;
5227 struct MeshChannel *ch;
5232 type = ntohs (msg->header.type);
5233 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got a %s message!\n",
5234 GNUNET_MESH_DEBUG_M2S (type));
5235 ch = channel_get (t, ntohl (msg->chid));
5238 GNUNET_STATISTICS_update (stats, "# ack on unknown channel", 1, GNUNET_NO);
5241 ack = ntohl (msg->mid);
5242 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! %s ACK %u\n",
5243 (GNUNET_YES == fwd) ? "FWD" : "BCK", ack);
5245 if (GNUNET_YES == fwd)
5259 for (work = GNUNET_NO, copy = rel->head_sent; copy != NULL; copy = next)
5261 if (GMC_is_pid_bigger (copy->mid, ack))
5263 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! head %u, out!\n", copy->mid);
5264 channel_rel_free_sent (rel, msg);
5268 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! id %u\n", copy->mid);
5270 rel_message_free (copy);
5272 /* ACK client if needed */
5273 // channel_send_ack (t, type, GNUNET_MESSAGE_TYPE_MESH_UNICAST_ACK == type);
5275 /* If some message was free'd, update the retransmission delay*/
5276 if (GNUNET_YES == work)
5278 if (GNUNET_SCHEDULER_NO_TASK != rel->retry_task)
5280 GNUNET_SCHEDULER_cancel (rel->retry_task);
5281 if (NULL == rel->head_sent)
5283 rel->retry_task = GNUNET_SCHEDULER_NO_TASK;
5287 struct GNUNET_TIME_Absolute new_target;
5288 struct GNUNET_TIME_Relative delay;
5290 delay = GNUNET_TIME_relative_multiply (rel->retry_timer,
5291 MESH_RETRANSMIT_MARGIN);
5292 new_target = GNUNET_TIME_absolute_add (rel->head_sent->timestamp,
5294 delay = GNUNET_TIME_absolute_get_remaining (new_target);
5296 GNUNET_SCHEDULER_add_delayed (delay,
5297 &channel_retransmit_message,
5308 * Core handler for connection creation.
5310 * @param cls Closure (unused).
5311 * @param peer Sender (neighbor).
5312 * @param message Message.
5314 * @return GNUNET_OK to keep the connection open,
5315 * GNUNET_SYSERR to close it (signal serious error)
5318 handle_mesh_connection_create (void *cls,
5319 const struct GNUNET_PeerIdentity *peer,
5320 const struct GNUNET_MessageHeader *message)
5322 struct GNUNET_MESH_ConnectionCreate *msg;
5323 struct GNUNET_PeerIdentity *id;
5324 struct GNUNET_HashCode *cid;
5325 struct MeshPeerPath *path;
5326 struct MeshPeer *dest_peer;
5327 struct MeshPeer *orig_peer;
5328 struct MeshConnection *c;
5329 unsigned int own_pos;
5333 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "\n\n");
5334 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received a connection create msg\n");
5337 size = ntohs (message->size);
5338 if (size < sizeof (struct GNUNET_MESH_ConnectionCreate))
5340 GNUNET_break_op (0);
5344 /* Calculate hops */
5345 size -= sizeof (struct GNUNET_MESH_ConnectionCreate);
5346 if (size % sizeof (struct GNUNET_PeerIdentity))
5348 GNUNET_break_op (0);
5351 size /= sizeof (struct GNUNET_PeerIdentity);
5354 GNUNET_break_op (0);
5357 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " path has %u hops.\n", size);
5359 /* Get parameters */
5360 msg = (struct GNUNET_MESH_ConnectionCreate *) message;
5362 id = (struct GNUNET_PeerIdentity *) &msg[1];
5363 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5364 " connection %s (%s).\n",
5365 GNUNET_h2s (cid), GNUNET_i2s (id));
5367 /* Create connection */
5368 c = connection_get (cid);
5371 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Creating connection\n");
5372 c = connection_new (cid);
5374 return GNUNET_OK; connection_reset_timeout (c, GNUNET_YES);
5375 tunnel_change_state (c->t, MESH_TUNNEL_WAITING);
5378 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Creating path...\n");
5379 path = path_new (size);
5381 for (i = 0; i < size; i++)
5383 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ... adding %s\n",
5384 GNUNET_i2s (&id[i]));
5385 path->peers[i] = GNUNET_PEER_intern (&id[i]);
5386 if (path->peers[i] == myid)
5389 if (own_pos == 0 && path->peers[own_pos] != myid)
5391 /* create path: self not found in path through self */
5392 GNUNET_break_op (0);
5393 path_destroy (path);
5394 connection_destroy (c);
5397 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Own position: %u\n", own_pos);
5398 path_add_to_peers (path, GNUNET_NO);
5399 c->path = path_duplicate (path);
5400 c->own_pos = own_pos;
5407 /* Remember peers */
5408 dest_peer = peer_get (&id[size - 1]);
5409 orig_peer = peer_get (&id[0]);
5411 /* Is it a connection to us? */
5412 if (c->own_pos == size - 1)
5414 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " It's for us!\n");
5415 peer_add_path_to_origin (orig_peer, path, GNUNET_YES);
5417 if (NULL == orig_peer->tunnel)
5418 orig_peer->tunnel = tunnel_new ();
5419 tunnel_add_connection (orig_peer->tunnel, c);
5421 send_connection_ack (c, GNUNET_NO);
5423 /* Keep tunnel alive in direction dest->owner*/
5424 connection_reset_timeout (c, GNUNET_NO);
5428 /* It's for somebody else! Retransmit. */
5429 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Retransmitting.\n");
5430 peer_add_path (dest_peer, path_duplicate (path), GNUNET_NO);
5431 peer_add_path_to_origin (orig_peer, path, GNUNET_NO);
5432 send_prebuilt_message_connection (message, c, NULL, GNUNET_YES);
5439 * Core handler for path ACKs
5441 * @param cls closure
5442 * @param message message
5443 * @param peer peer identity this notification is about
5445 * @return GNUNET_OK to keep the connection open,
5446 * GNUNET_SYSERR to close it (signal serious error)
5449 handle_mesh_connection_ack (void *cls, const struct GNUNET_PeerIdentity *peer,
5450 const struct GNUNET_MessageHeader *message)
5452 struct GNUNET_MESH_ConnectionACK *msg;
5453 struct MeshPeerPath *p;
5454 struct MeshConnection *c;
5456 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "\n\n");
5457 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received a connection ACK msg\n");
5458 msg = (struct GNUNET_MESH_ConnectionACK *) message;
5459 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " on connection %s\n",
5460 GNUNET_h2s (&msg->cid));
5461 c = connection_get (&msg->cid);
5464 GNUNET_STATISTICS_update (stats, "# control on unknown connection",
5466 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " don't know the connection!\n");
5470 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " via peer %s\n",
5473 /* Add path to peers? */
5477 path_add_to_peers (p, GNUNET_YES);
5483 connection_change_state (c, MESH_CONNECTION_READY);
5484 connection_reset_timeout (c, GNUNET_NO);
5485 if (MESH_TUNNEL_READY != c->t->state)
5486 tunnel_change_state (c->t, MESH_TUNNEL_READY);
5487 tunnel_send_queued_data (c->t, GNUNET_YES);
5489 /* Message for us? */
5490 if (connection_is_terminal (c, GNUNET_NO))
5492 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Connection ACK for us!\n");
5493 if (3 <= tunnel_count_connections (c->t) && NULL != c->t->peer->dhtget)
5495 GNUNET_DHT_get_stop (c->t->peer->dhtget);
5496 c->t->peer->dhtget = NULL;
5498 //connection_send_ack (c, GNUNET_NO); /* FIXME */
5502 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " not for us, retransmitting...\n");
5503 send_prebuilt_message_connection (message, c, NULL, GNUNET_NO);
5509 * Core handler for notifications of broken paths
5511 * @param cls Closure (unused).
5512 * @param peer Peer identity of sending neighbor.
5513 * @param message Message.
5515 * @return GNUNET_OK to keep the connection open,
5516 * GNUNET_SYSERR to close it (signal serious error)
5519 handle_mesh_connection_broken (void *cls, const struct GNUNET_PeerIdentity *peer,
5520 const struct GNUNET_MessageHeader *message)
5522 struct GNUNET_MESH_ConnectionBroken *msg;
5523 struct MeshConnection *c;
5525 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5526 "Received a CONNECTION BROKEN msg from %s\n", GNUNET_i2s (peer));
5527 msg = (struct GNUNET_MESH_ConnectionBroken *) message;
5528 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " regarding %s\n",
5529 GNUNET_i2s (&msg->peer1));
5530 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " regarding %s\n",
5531 GNUNET_i2s (&msg->peer2));
5532 c = connection_get (&msg->cid);
5535 GNUNET_break_op (0);
5538 tunnel_notify_connection_broken (c->t, GNUNET_PEER_search (&msg->peer1),
5539 GNUNET_PEER_search (&msg->peer2));
5546 * Core handler for tunnel destruction
5548 * @param cls Closure (unused).
5549 * @param peer Peer identity of sending neighbor.
5550 * @param message Message.
5552 * @return GNUNET_OK to keep the connection open,
5553 * GNUNET_SYSERR to close it (signal serious error)
5556 handle_mesh_connection_destroy (void *cls,
5557 const struct GNUNET_PeerIdentity *peer,
5558 const struct GNUNET_MessageHeader *message)
5560 struct GNUNET_MESH_ConnectionDestroy *msg;
5561 struct MeshConnection *c;
5565 msg = (struct GNUNET_MESH_ConnectionDestroy *) message;
5566 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5567 "Got a CONNECTION DESTROY message from %s\n",
5569 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5570 " for connection %s\n",
5571 GNUNET_h2s (&msg->cid));
5572 c = connection_get (&msg->cid);
5575 /* Probably already got the message from another path,
5576 * destroyed the tunnel and retransmitted to children.
5579 GNUNET_STATISTICS_update (stats, "# control on unknown tunnel",
5583 id = GNUNET_PEER_search (peer);
5584 if (id == connection_get_prev_hop (c)->id)
5586 else if (id == connection_get_next_hop (c)->id)
5590 GNUNET_break_op (0);
5593 send_prebuilt_message_connection (message, c, NULL, fwd);
5594 c->destroy = GNUNET_YES;
5601 * Handler for channel create messages.
5603 * @param t Tunnel this channel is to be created in.
5604 * @param msg Message.
5605 * @param fwd Is this FWD traffic? GNUNET_YES : GNUNET_NO;
5608 handle_channel_create (struct MeshTunnel2 *t,
5609 struct GNUNET_MESH_ChannelCreate *msg,
5612 MESH_ChannelNumber chid;
5613 struct MeshChannel *ch;
5614 struct MeshClient *c;
5617 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received Channel Create\n");
5618 /* Check message size */
5619 if (ntohs (msg->header.size) != sizeof (struct GNUNET_MESH_ChannelCreate))
5621 GNUNET_break_op (0);
5625 /* Check if channel exists */
5626 chid = ntohl (msg->chid);
5627 ch = channel_get (t, chid);
5630 /* Probably a retransmission, safe to ignore */
5631 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " already exists...\n");
5632 if (NULL != ch->dest)
5634 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " duplicate CC!!\n");
5635 channel_send_ack (ch, !fwd);
5641 /* Create channel */
5642 ch = channel_new (t, NULL, 0);
5643 channel_set_options (ch, ntohl (msg->opt));
5646 /* Find a destination client */
5647 port = ntohl (msg->port);
5648 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " port %u\n", port);
5649 c = GNUNET_CONTAINER_multihashmap32_get (ports, port);
5652 /* TODO send reject */
5653 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " no client has port registered\n");
5658 channel_add_client (ch, c);
5659 if (GNUNET_YES == ch->reliable)
5660 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! Reliable\n");
5662 send_local_channel_create (ch);
5663 channel_send_ack (ch, !fwd);
5664 send_local_ack (ch, !fwd);
5669 * Handler for channel ack messages.
5671 * @param t Tunnel this channel is to be created in.
5672 * @param msg Message.
5673 * @param fwd Is this FWD traffic? GNUNET_YES : GNUNET_NO;
5676 handle_channel_ack (struct MeshTunnel2 *t,
5677 struct GNUNET_MESH_ChannelManage *msg,
5680 MESH_ChannelNumber chid;
5681 struct MeshChannel *ch;
5683 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received Channel ACK\n");
5684 /* Check message size */
5685 if (ntohs (msg->header.size) != sizeof (struct GNUNET_MESH_ChannelManage))
5687 GNUNET_break_op (0);
5691 /* Check if channel exists */
5692 chid = ntohl (msg->chid);
5693 ch = channel_get (t, chid);
5696 GNUNET_break_op (0);
5697 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " channel %u unknown!!\n", chid);
5701 channel_confirm (ch, !fwd);
5706 * Handler for channel destroy messages.
5708 * @param t Tunnel this channel is to be destroyed of.
5709 * @param msg Message.
5710 * @param fwd Is this FWD traffic? GNUNET_YES : GNUNET_NO;
5713 handle_channel_destroy (struct MeshTunnel2 *t,
5714 struct GNUNET_MESH_ChannelManage *msg,
5717 MESH_ChannelNumber chid;
5718 struct MeshChannel *ch;
5720 /* Check message size */
5721 if (ntohs (msg->header.size) != sizeof (struct GNUNET_MESH_ChannelManage))
5723 GNUNET_break_op (0);
5727 /* Check if channel exists */
5728 chid = ntohl (msg->chid);
5729 ch = channel_get (t, chid);
5732 /* Probably a retransmission, safe to ignore */
5736 send_local_channel_destroy (ch, fwd);
5737 channel_destroy (ch);
5742 handle_decrypted (struct MeshTunnel2 *t,
5743 const struct GNUNET_MessageHeader *msgh,
5746 switch (ntohs (msgh->type))
5748 case GNUNET_MESSAGE_TYPE_MESH_DATA:
5749 /* Don't send hop ACK, wait for client to ACK */
5750 handle_data (t, (struct GNUNET_MESH_Data *) msgh, fwd);
5753 case GNUNET_MESSAGE_TYPE_MESH_DATA_ACK:
5754 handle_data_ack (t, (struct GNUNET_MESH_DataACK *) msgh, fwd);
5757 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE:
5758 handle_channel_create (t,
5759 (struct GNUNET_MESH_ChannelCreate *) msgh,
5763 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_ACK:
5764 handle_channel_ack (t,
5765 (struct GNUNET_MESH_ChannelManage *) msgh,
5769 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY:
5770 handle_channel_destroy (t,
5771 (struct GNUNET_MESH_ChannelManage *) msgh,
5776 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5777 "end-to-end message not known (%u)\n",
5778 ntohs (msgh->type));
5784 * Generic handler for mesh network encrypted traffic.
5786 * @param peer Peer identity this notification is about.
5787 * @param message Encrypted message.
5788 * @param fwd Is this FWD traffic? GNUNET_YES : GNUNET_NO;
5790 * @return GNUNET_OK to keep the connection open,
5791 * GNUNET_SYSERR to close it (signal serious error)
5794 handle_mesh_encrypted (const struct GNUNET_PeerIdentity *peer,
5795 const struct GNUNET_MESH_Encrypted *msg,
5798 struct MeshConnection *c;
5799 struct MeshTunnel2 *t;
5800 struct MeshPeer *neighbor;
5801 struct MeshFlowControl *fc;
5808 size = ntohs (msg->header.size);
5810 sizeof (struct GNUNET_MESH_Encrypted) +
5811 sizeof (struct GNUNET_MessageHeader))
5813 GNUNET_break_op (0);
5816 type = ntohs (msg->header.type);
5817 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "\n\n");
5818 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "got a %s message from %s\n",
5819 GNUNET_MESH_DEBUG_M2S (type), GNUNET_i2s (peer));
5821 /* Check connection */
5822 c = connection_get (&msg->cid);
5825 GNUNET_STATISTICS_update (stats, "# unknown connection", 1, GNUNET_NO);
5826 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "WARNING connection unknown\n");
5830 fc = fwd ? &c->fwd_fc : &c->bck_fc;
5832 /* Check if origin is as expected */
5833 neighbor = connection_get_hop (c, fwd);
5834 if (peer_get (peer)->id != neighbor->id)
5836 GNUNET_break_op (0);
5841 pid = ntohl (msg->pid);
5842 if (GMC_is_pid_bigger (pid, fc->last_ack_sent))
5844 GNUNET_STATISTICS_update (stats, "# unsolicited message", 1, GNUNET_NO);
5845 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5846 "WARNING Received PID %u, (prev %u), ACK %u\n",
5847 pid, fc->last_pid_recv, fc->last_ack_sent);
5850 if (GNUNET_NO == GMC_is_pid_bigger (pid, fc->last_pid_recv))
5852 GNUNET_STATISTICS_update (stats, "# duplicate PID", 1, GNUNET_NO);
5853 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5854 " Pid %u not expected (%u+), dropping!\n",
5855 pid, fc->last_pid_recv + 1);
5858 if (MESH_CONNECTION_SENT == c->state)
5859 connection_change_state (c, MESH_CONNECTION_READY);
5860 connection_reset_timeout (c, fwd);
5861 fc->last_pid_recv = pid;
5863 /* Is this message for us? */
5864 if (connection_is_terminal (c, fwd))
5866 size_t dsize = size - sizeof (struct GNUNET_MESH_Encrypted);
5868 struct GNUNET_MessageHeader *msgh;
5871 /* TODO signature verification */
5872 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " message for us!\n");
5873 GNUNET_STATISTICS_update (stats, "# messages received", 1, GNUNET_NO);
5875 fc->last_pid_recv = pid;
5876 tunnel_decrypt (t, cbuf, &msg[1], dsize, msg->iv, fwd);
5880 msgh = (struct GNUNET_MessageHeader *) &cbuf[off];
5881 handle_decrypted (t, msgh, fwd);
5882 off += ntohs (msgh->size);
5884 send_ack (c, NULL, fwd);
5888 /* Message not for us: forward to next hop */
5889 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " not for us, retransmitting...\n");
5890 ttl = ntohl (msg->ttl);
5891 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ttl: %u\n", ttl);
5894 GNUNET_STATISTICS_update (stats, "# TTL drops", 1, GNUNET_NO);
5895 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, " TTL is 0, DROPPING!\n");
5896 send_ack (c, NULL, fwd);
5899 GNUNET_STATISTICS_update (stats, "# messages forwarded", 1, GNUNET_NO);
5901 send_prebuilt_message_connection (&msg->header, c, NULL, fwd);
5908 * Core handler for mesh network traffic going orig->dest.
5910 * @param cls Closure (unused).
5911 * @param message Message received.
5912 * @param peer Peer who sent the message.
5914 * @return GNUNET_OK to keep the connection open,
5915 * GNUNET_SYSERR to close it (signal serious error)
5918 handle_mesh_fwd (void *cls, const struct GNUNET_PeerIdentity *peer,
5919 const struct GNUNET_MessageHeader *message)
5921 return handle_mesh_encrypted (peer,
5922 (struct GNUNET_MESH_Encrypted *)message,
5927 * Core handler for mesh network traffic going dest->orig.
5929 * @param cls Closure (unused).
5930 * @param message Message received.
5931 * @param peer Peer who sent the message.
5933 * @return GNUNET_OK to keep the connection open,
5934 * GNUNET_SYSERR to close it (signal serious error)
5937 handle_mesh_bck (void *cls, const struct GNUNET_PeerIdentity *peer,
5938 const struct GNUNET_MessageHeader *message)
5940 return handle_mesh_encrypted (peer,
5941 (struct GNUNET_MESH_Encrypted *)message,
5947 * Core handler for mesh network traffic point-to-point acks.
5949 * @param cls closure
5950 * @param message message
5951 * @param peer peer identity this notification is about
5953 * @return GNUNET_OK to keep the connection open,
5954 * GNUNET_SYSERR to close it (signal serious error)
5957 handle_mesh_ack (void *cls, const struct GNUNET_PeerIdentity *peer,
5958 const struct GNUNET_MessageHeader *message)
5960 struct GNUNET_MESH_ACK *msg;
5961 struct MeshConnection *c;
5962 struct MeshFlowControl *fc;
5966 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "\n\n");
5967 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got an ACK packet from %s!\n",
5969 msg = (struct GNUNET_MESH_ACK *) message;
5971 c = connection_get (&msg->cid);
5975 GNUNET_STATISTICS_update (stats, "# ack on unknown connection", 1,
5980 /* Is this a forward or backward ACK? */
5981 id = GNUNET_PEER_search (peer);
5982 if (connection_get_next_hop (c)->id == id)
5984 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " FWD ACK\n");
5987 else if (connection_get_prev_hop (c)->id == id)
5989 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " BCK ACK\n");
5994 GNUNET_break_op (0);
5998 ack = ntohl (msg->ack);
5999 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ACK %u\n", ack);
6001 /* Cancel polling if the ACK is bigger than before. */
6002 if (GNUNET_SCHEDULER_NO_TASK != fc->poll_task &&
6003 GMC_is_pid_bigger (ack, fc->last_ack_recv))
6005 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Cancel poll\n");
6006 GNUNET_SCHEDULER_cancel (fc->poll_task);
6007 fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
6008 fc->poll_time = GNUNET_TIME_UNIT_SECONDS;
6011 fc->last_ack_recv = ack;
6012 connection_unlock_queue (c, fc == &c->fwd_fc);
6019 * Core handler for mesh network traffic point-to-point ack polls.
6021 * @param cls closure
6022 * @param message message
6023 * @param peer peer identity this notification is about
6025 * @return GNUNET_OK to keep the connection open,
6026 * GNUNET_SYSERR to close it (signal serious error)
6029 handle_mesh_poll (void *cls, const struct GNUNET_PeerIdentity *peer,
6030 const struct GNUNET_MessageHeader *message)
6032 struct GNUNET_MESH_Poll *msg;
6033 struct MeshConnection *c;
6034 struct MeshFlowControl *fc;
6039 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "\n\n");
6040 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got a POLL packet from %s!\n",
6043 msg = (struct GNUNET_MESH_Poll *) message;
6045 c = connection_get (&msg->cid);
6049 GNUNET_STATISTICS_update (stats, "# poll on unknown connection", 1,
6051 GNUNET_break_op (0);
6055 /* Is this a forward or backward ACK?
6056 * Note: a poll should never be needed in a loopback case,
6057 * since there is no possiblility of packet loss there, so
6058 * this way of discerining FWD/BCK should not be a problem.
6060 id = GNUNET_PEER_search (peer);
6061 if (connection_get_next_hop (c)->id == id)
6063 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " FWD ACK\n");
6066 else if (connection_get_prev_hop (c)->id == id)
6068 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " BCK ACK\n");
6073 GNUNET_break_op (0);
6077 pid = ntohl (msg->pid);
6078 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " PID %u, OLD %u\n",
6079 pid, fc->last_pid_recv);
6080 fc->last_pid_recv = pid;
6081 fwd = fc == &c->fwd_fc;
6082 send_ack (c, NULL, fwd);
6089 * Core handler for mesh keepalives.
6091 * @param cls closure
6092 * @param message message
6093 * @param peer peer identity this notification is about
6094 * @return GNUNET_OK to keep the connection open,
6095 * GNUNET_SYSERR to close it (signal serious error)
6097 * TODO: Check who we got this from, to validate route.
6100 handle_mesh_keepalive (void *cls, const struct GNUNET_PeerIdentity *peer,
6101 const struct GNUNET_MessageHeader *message)
6103 struct GNUNET_MESH_ConnectionKeepAlive *msg;
6104 struct MeshConnection *c;
6105 struct MeshPeer *neighbor;
6108 msg = (struct GNUNET_MESH_ConnectionKeepAlive *) message;
6109 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "got a keepalive packet from %s\n",
6112 c = connection_get (&msg->cid);
6115 GNUNET_STATISTICS_update (stats, "# keepalive on unknown connection", 1,
6120 fwd = GNUNET_MESSAGE_TYPE_MESH_FWD_KEEPALIVE == ntohs (message->type) ?
6121 GNUNET_YES : GNUNET_NO;
6123 /* Check if origin is as expected */
6124 neighbor = connection_get_hop (c, fwd);
6125 if (peer_get (peer)->id != neighbor->id)
6127 GNUNET_break_op (0);
6131 connection_change_state (c, MESH_CONNECTION_READY);
6132 connection_reset_timeout (c, fwd);
6134 if (connection_is_terminal (c, fwd))
6137 GNUNET_STATISTICS_update (stats, "# keepalives forwarded", 1, GNUNET_NO);
6138 send_prebuilt_message_connection (message, c, NULL, fwd);
6146 * Functions to handle messages from core
6148 static struct GNUNET_CORE_MessageHandler core_handlers[] = {
6149 {&handle_mesh_connection_create, GNUNET_MESSAGE_TYPE_MESH_CONNECTION_CREATE,
6151 {&handle_mesh_connection_ack, GNUNET_MESSAGE_TYPE_MESH_CONNECTION_ACK,
6152 sizeof (struct GNUNET_MESH_ConnectionACK)},
6153 {&handle_mesh_connection_broken, GNUNET_MESSAGE_TYPE_MESH_CONNECTION_BROKEN,
6154 sizeof (struct GNUNET_MESH_ConnectionBroken)},
6155 {&handle_mesh_connection_destroy, GNUNET_MESSAGE_TYPE_MESH_CONNECTION_DESTROY,
6156 sizeof (struct GNUNET_MESH_ConnectionDestroy)},
6157 {&handle_mesh_keepalive, GNUNET_MESSAGE_TYPE_MESH_FWD_KEEPALIVE,
6158 sizeof (struct GNUNET_MESH_ConnectionKeepAlive)},
6159 {&handle_mesh_keepalive, GNUNET_MESSAGE_TYPE_MESH_BCK_KEEPALIVE,
6160 sizeof (struct GNUNET_MESH_ConnectionKeepAlive)},
6161 {&handle_mesh_ack, GNUNET_MESSAGE_TYPE_MESH_ACK,
6162 sizeof (struct GNUNET_MESH_ACK)},
6163 {&handle_mesh_poll, GNUNET_MESSAGE_TYPE_MESH_POLL,
6164 sizeof (struct GNUNET_MESH_Poll)},
6165 {&handle_mesh_fwd, GNUNET_MESSAGE_TYPE_MESH_FWD, 0},
6166 {&handle_mesh_bck, GNUNET_MESSAGE_TYPE_MESH_BCK, 0},
6172 * Function to process paths received for a new peer addition. The recorded
6173 * paths form the initial tunnel, which can be optimized later.
6174 * Called on each result obtained for the DHT search.
6176 * @param cls closure
6177 * @param exp when will this value expire
6178 * @param key key of the result
6179 * @param get_path path of the get request
6180 * @param get_path_length lenght of get_path
6181 * @param put_path path of the put request
6182 * @param put_path_length length of the put_path
6183 * @param type type of the result
6184 * @param size number of bytes in data
6185 * @param data pointer to the result data
6188 dht_get_id_handler (void *cls, struct GNUNET_TIME_Absolute exp,
6189 const struct GNUNET_HashCode * key,
6190 const struct GNUNET_PeerIdentity *get_path,
6191 unsigned int get_path_length,
6192 const struct GNUNET_PeerIdentity *put_path,
6193 unsigned int put_path_length, enum GNUNET_BLOCK_Type type,
6194 size_t size, const void *data)
6196 struct MeshPeer *peer = cls;
6197 struct MeshPeerPath *p;
6198 struct MeshConnection *c;
6199 struct GNUNET_PeerIdentity pi;
6202 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got results from DHT!\n");
6203 GNUNET_PEER_resolve (peer->id, &pi);
6204 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " for %s\n", GNUNET_i2s (&pi));
6206 p = path_build_from_dht (get_path, get_path_length,
6207 put_path, put_path_length);
6208 path_add_to_peers (p, GNUNET_NO);
6211 /* Count connections */
6212 for (c = peer->tunnel->connection_head, i = 0; NULL != c; c = c->next, i++);
6214 /* If we already have 3 (or more (?!)) connections, it's enough */
6218 if (peer->tunnel->state == MESH_TUNNEL_SEARCHING)
6220 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ... connect!\n");
6221 peer_connect (peer);
6227 /******************************************************************************/
6228 /********************* MESH LOCAL HANDLES **************************/
6229 /******************************************************************************/
6233 * Handler for client connection.
6235 * @param cls Closure (unused).
6236 * @param client Client handler.
6239 handle_local_client_connect (void *cls, struct GNUNET_SERVER_Client *client)
6241 struct MeshClient *c;
6245 c = GNUNET_malloc (sizeof (struct MeshClient));
6247 c->id = next_client_id++; /* overflow not important: just for debug */
6248 GNUNET_SERVER_client_keep (client);
6249 GNUNET_SERVER_client_set_user_context (client, c);
6250 GNUNET_CONTAINER_DLL_insert (clients_head, clients_tail, c);
6255 * Handler for client disconnection
6257 * @param cls closure
6258 * @param client identification of the client; NULL
6259 * for the last call when the server is destroyed
6262 handle_local_client_disconnect (void *cls, struct GNUNET_SERVER_Client *client)
6264 struct MeshClient *c;
6266 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "client disconnected: %p\n", client);
6269 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " (SERVER DOWN)\n");
6273 c = client_get (client);
6276 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "matching client found (%u, %p)\n",
6278 GNUNET_SERVER_client_drop (c->handle);
6279 c->shutting_down = GNUNET_YES;
6280 if (NULL != c->own_channels)
6282 GNUNET_CONTAINER_multihashmap32_iterate (c->own_channels,
6283 &channel_destroy_iterator, c);
6284 GNUNET_CONTAINER_multihashmap32_destroy (c->own_channels);
6287 if (NULL != c->incoming_channels)
6289 GNUNET_CONTAINER_multihashmap32_iterate (c->incoming_channels,
6290 &channel_destroy_iterator, c);
6291 GNUNET_CONTAINER_multihashmap32_destroy (c->incoming_channels);
6294 if (NULL != c->ports)
6296 GNUNET_CONTAINER_multihashmap32_iterate (c->ports,
6297 &client_release_ports, c);
6298 GNUNET_CONTAINER_multihashmap32_destroy (c->ports);
6300 GNUNET_CONTAINER_DLL_remove (clients_head, clients_tail, c);
6301 GNUNET_STATISTICS_update (stats, "# clients", -1, GNUNET_NO);
6302 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " client free (%p)\n", c);
6307 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, " context NULL!\n");
6309 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "done!\n");
6315 * Handler for new clients
6317 * @param cls closure
6318 * @param client identification of the client
6319 * @param message the actual message, which includes messages the client wants
6322 handle_local_new_client (void *cls, struct GNUNET_SERVER_Client *client,
6323 const struct GNUNET_MessageHeader *message)
6325 struct GNUNET_MESH_ClientConnect *cc_msg;
6326 struct MeshClient *c;
6331 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "new client connected %p\n", client);
6333 /* Check data sanity */
6334 size = ntohs (message->size) - sizeof (struct GNUNET_MESH_ClientConnect);
6335 cc_msg = (struct GNUNET_MESH_ClientConnect *) message;
6336 if (0 != (size % sizeof (uint32_t)))
6339 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
6342 size /= sizeof (uint32_t);
6344 /* Initialize new client structure */
6345 c = GNUNET_SERVER_client_get_user_context (client, struct MeshClient);
6346 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " client id %u\n", c->id);
6347 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " client has %u ports\n", size);
6352 p = (uint32_t *) &cc_msg[1];
6353 c->ports = GNUNET_CONTAINER_multihashmap32_create (size);
6354 for (i = 0; i < size; i++)
6357 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " port: %u\n", u32);
6359 /* store in client's hashmap */
6360 GNUNET_CONTAINER_multihashmap32_put (c->ports, u32, c,
6361 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST);
6362 /* store in global hashmap */
6363 /* FIXME only allow one client to have the port open,
6364 * have a backup hashmap with waiting clients */
6365 GNUNET_CONTAINER_multihashmap32_put (ports, u32, c,
6366 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
6370 c->own_channels = GNUNET_CONTAINER_multihashmap32_create (32);
6371 c->incoming_channels = GNUNET_CONTAINER_multihashmap32_create (32);
6372 GNUNET_SERVER_notification_context_add (nc, client);
6373 GNUNET_STATISTICS_update (stats, "# clients", 1, GNUNET_NO);
6375 GNUNET_SERVER_receive_done (client, GNUNET_OK);
6376 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "new client processed\n");
6381 * Handler for requests of new tunnels
6383 * @param cls Closure.
6384 * @param client Identification of the client.
6385 * @param message The actual message.
6388 handle_local_channel_create (void *cls, struct GNUNET_SERVER_Client *client,
6389 const struct GNUNET_MessageHeader *message)
6391 struct GNUNET_MESH_ChannelMessage *msg;
6392 struct MeshPeer *peer;
6393 struct MeshTunnel2 *t;
6394 struct MeshChannel *ch;
6395 struct MeshClient *c;
6396 MESH_ChannelNumber chid;
6398 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "new channel requested\n");
6400 /* Sanity check for client registration */
6401 if (NULL == (c = client_get (client)))
6404 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
6407 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
6409 /* Message size sanity check */
6410 if (sizeof (struct GNUNET_MESH_ChannelMessage) != ntohs (message->size))
6413 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
6417 msg = (struct GNUNET_MESH_ChannelMessage *) message;
6418 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " towards %s:%u\n",
6419 GNUNET_i2s (&msg->peer), ntohl (msg->port));
6420 chid = ntohl (msg->channel_id);
6422 /* Sanity check for duplicate channel IDs */
6423 if (NULL != channel_get_by_local_id (c, chid))
6426 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
6430 peer = peer_get (&msg->peer);
6431 if (NULL == peer->tunnel)
6433 peer->tunnel = tunnel_new ();
6434 peer->tunnel->peer = peer;
6438 /* Create channel */
6439 ch = channel_new (t, c, chid);
6443 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
6446 ch->port = ntohl (msg->port);
6447 channel_set_options (ch, ntohl (msg->opt));
6449 /* In unreliable channels, we'll use the DLL to buffer data for the root */
6450 ch->root_rel = GNUNET_new (struct MeshChannelReliability);
6451 ch->root_rel->ch = ch;
6452 ch->root_rel->expected_delay = MESH_RETRANSMIT_TIME;
6454 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "CREATED CHANNEL %s[%x]:%u (%x)\n",
6455 peer2s (t->peer), ch->gid, ch->port, ch->lid_root);
6456 peer_connect (peer);
6458 /* Send create channel */
6460 struct GNUNET_MESH_ChannelCreate msgcc;
6462 msgcc.header.size = htons (sizeof (msgcc));
6463 msgcc.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE);
6464 msgcc.chid = htonl (ch->gid);
6465 msgcc.port = msg->port;
6466 msgcc.opt = msg->opt;
6468 tunnel_queue_data (t, ch, &msgcc.header, GNUNET_YES);
6471 GNUNET_SERVER_receive_done (client, GNUNET_OK);
6477 * Handler for requests of deleting tunnels
6479 * @param cls closure
6480 * @param client identification of the client
6481 * @param message the actual message
6484 handle_local_channel_destroy (void *cls, struct GNUNET_SERVER_Client *client,
6485 const struct GNUNET_MessageHeader *message)
6487 struct GNUNET_MESH_ChannelMessage *msg;
6488 struct MeshClient *c;
6489 struct MeshChannel *ch;
6490 struct MeshTunnel2 *t;
6491 MESH_ChannelNumber chid;
6493 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
6494 "Got a DESTROY CHANNEL from client!\n");
6496 /* Sanity check for client registration */
6497 if (NULL == (c = client_get (client)))
6500 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
6503 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
6505 /* Message sanity check */
6506 if (sizeof (struct GNUNET_MESH_ChannelMessage) != ntohs (message->size))
6509 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
6513 msg = (struct GNUNET_MESH_ChannelMessage *) message;
6515 /* Retrieve tunnel */
6516 chid = ntohl (msg->channel_id);
6517 ch = channel_get_by_local_id (c, chid);
6520 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, " channel %X not found\n", chid);
6522 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
6526 /* Cleanup after the tunnel */
6527 client_delete_channel (c, ch);
6528 if (c == ch->dest && GNUNET_MESH_LOCAL_CHANNEL_ID_SERV <= chid)
6532 else if (c == ch->root && GNUNET_MESH_LOCAL_CHANNEL_ID_SERV > chid)
6538 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
6539 " channel %X client %p (%p, %p)\n",
6540 chid, c, ch->root, ch->dest);
6545 channel_destroy (ch);
6546 tunnel_destroy_if_empty (t);
6548 GNUNET_SERVER_receive_done (client, GNUNET_OK);
6554 * Handler for client traffic
6556 * @param cls closure
6557 * @param client identification of the client
6558 * @param message the actual message
6561 handle_local_data (void *cls, struct GNUNET_SERVER_Client *client,
6562 const struct GNUNET_MessageHeader *message)
6564 struct GNUNET_MESH_LocalData *msg;
6565 struct MeshClient *c;
6566 struct MeshChannel *ch;
6567 struct MeshChannelReliability *rel;
6568 MESH_ChannelNumber chid;
6572 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
6573 "Got data from a client!\n");
6575 /* Sanity check for client registration */
6576 if (NULL == (c = client_get (client)))
6579 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
6582 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
6584 msg = (struct GNUNET_MESH_LocalData *) message;
6586 /* Sanity check for message size */
6587 size = ntohs (message->size) - sizeof (struct GNUNET_MESH_LocalData);
6588 if (size < sizeof (struct GNUNET_MessageHeader))
6591 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
6595 /* Channel exists? */
6596 chid = ntohl (msg->id);
6597 fwd = chid < GNUNET_MESH_LOCAL_CHANNEL_ID_SERV;
6598 ch = channel_get_by_local_id (c, chid);
6602 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
6606 /* Is the client in the channel? */
6609 ch->root->handle == client)
6613 ch->dest->handle == client) ) )
6616 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
6620 rel = fwd ? ch->root_rel : ch->dest_rel;
6621 rel->client_ready = GNUNET_NO;
6623 /* Ok, everything is correct, send the message. */
6625 struct GNUNET_MESH_Data *payload;
6626 uint16_t p2p_size = sizeof(struct GNUNET_MESH_Data) + size;
6627 unsigned char cbuf[p2p_size];
6629 payload = (struct GNUNET_MESH_Data *) cbuf;
6630 payload->mid = htonl (rel->mid_send);
6632 memcpy (&payload[1], &msg[1], size);
6633 payload->header.size = htons (p2p_size);
6634 payload->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_DATA);
6635 payload->chid = htonl (ch->gid);
6636 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " sending on channel...\n");
6637 send_prebuilt_message_channel (&payload->header, ch, fwd);
6639 if (GNUNET_YES == ch->reliable)
6640 channel_save_copy (ch, &payload->header, fwd);
6642 if (tunnel_get_buffer (ch->t, fwd) > 0)
6643 send_local_ack (ch, fwd);
6644 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "receive done OK\n");
6645 GNUNET_SERVER_receive_done (client, GNUNET_OK);
6652 * Handler for client's ACKs for payload traffic.
6654 * @param cls Closure (unused).
6655 * @param client Identification of the client.
6656 * @param message The actual message.
6659 handle_local_ack (void *cls, struct GNUNET_SERVER_Client *client,
6660 const struct GNUNET_MessageHeader *message)
6662 struct GNUNET_MESH_LocalAck *msg;
6663 struct MeshChannelReliability *rel;
6664 struct MeshChannel *ch;
6665 struct MeshClient *c;
6666 MESH_ChannelNumber chid;
6669 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got a local ACK\n");
6671 /* Sanity check for client registration */
6672 if (NULL == (c = client_get (client)))
6675 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
6678 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
6680 msg = (struct GNUNET_MESH_LocalAck *) message;
6682 /* Channel exists? */
6683 chid = ntohl (msg->channel_id);
6684 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " on channel %X\n", chid);
6685 ch = channel_get_by_local_id (c, chid);
6686 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " -- ch %p\n", ch);
6690 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Channel %X unknown.\n", chid);
6691 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, " for client %u.\n", c->id);
6692 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
6696 /* If client is root, the ACK is going FWD, therefore this is "BCK". */
6697 /* If client is dest, the ACK is going BCK, therefore this is "FWD" */
6698 fwd = chid >= GNUNET_MESH_LOCAL_CHANNEL_ID_SERV;
6699 rel = fwd ? ch->dest_rel : ch->root_rel;
6701 rel->client_ready = GNUNET_YES;
6702 channel_send_client_buffered_data (ch, c, fwd);
6703 send_ack (NULL, ch, fwd);
6705 GNUNET_SERVER_receive_done (client, GNUNET_OK);
6712 * Iterator over all tunnels to send a monitoring client info about each tunnel.
6714 * @param cls Closure (client handle).
6715 * @param key Key (hashed tunnel ID, unused).
6716 * @param value Tunnel info.
6718 * @return GNUNET_YES, to keep iterating.
6721 // monitor_all_tunnels_iterator (void *cls,
6722 // const struct GNUNET_HashCode * key,
6725 // struct GNUNET_SERVER_Client *client = cls;
6726 // struct MeshChannel *ch = value;
6727 // struct GNUNET_MESH_LocalMonitor *msg;
6729 // msg = GNUNET_malloc (sizeof(struct GNUNET_MESH_LocalMonitor));
6730 // msg->channel_id = htonl (ch->gid);
6731 // msg->header.size = htons (sizeof (struct GNUNET_MESH_LocalMonitor));
6732 // msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_TUNNELS);
6734 // GNUNET_log (GNUNET_ERROR_TYPE_INFO,
6735 // "* sending info about tunnel %s\n",
6736 // GNUNET_i2s (&msg->owner));
6738 // GNUNET_SERVER_notification_context_unicast (nc, client,
6739 // &msg->header, GNUNET_NO);
6740 // return GNUNET_YES;
6745 * Handler for client's MONITOR request.
6747 * @param cls Closure (unused).
6748 * @param client Identification of the client.
6749 * @param message The actual message.
6752 handle_local_get_tunnels (void *cls, struct GNUNET_SERVER_Client *client,
6753 const struct GNUNET_MessageHeader *message)
6755 struct MeshClient *c;
6757 /* Sanity check for client registration */
6758 if (NULL == (c = client_get (client)))
6761 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
6765 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
6766 "Received get tunnels request from client %u\n",
6768 // GNUNET_CONTAINER_multihashmap_iterate (tunnels,
6769 // monitor_all_tunnels_iterator,
6771 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
6772 "Get tunnels request from client %u completed\n",
6774 GNUNET_SERVER_receive_done (client, GNUNET_OK);
6779 * Handler for client's MONITOR_TUNNEL request.
6781 * @param cls Closure (unused).
6782 * @param client Identification of the client.
6783 * @param message The actual message.
6786 handle_local_show_tunnel (void *cls, struct GNUNET_SERVER_Client *client,
6787 const struct GNUNET_MessageHeader *message)
6789 const struct GNUNET_MESH_LocalMonitor *msg;
6790 struct GNUNET_MESH_LocalMonitor *resp;
6791 struct MeshClient *c;
6792 struct MeshChannel *ch;
6794 /* Sanity check for client registration */
6795 if (NULL == (c = client_get (client)))
6798 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
6802 msg = (struct GNUNET_MESH_LocalMonitor *) message;
6803 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
6804 "Received tunnel info request from client %u for tunnel %s[%X]\n",
6807 ntohl (msg->channel_id));
6808 // ch = channel_get (&msg->owner, ntohl (msg->channel_id));
6812 /* We don't know the tunnel */
6813 struct GNUNET_MESH_LocalMonitor warn;
6816 GNUNET_SERVER_notification_context_unicast (nc, client,
6819 GNUNET_SERVER_receive_done (client, GNUNET_OK);
6823 /* Initialize context */
6824 resp = GNUNET_malloc (sizeof (struct GNUNET_MESH_LocalMonitor));
6826 resp->header.size = htons (sizeof (struct GNUNET_MESH_LocalMonitor));
6827 GNUNET_SERVER_notification_context_unicast (nc, c->handle,
6828 &resp->header, GNUNET_NO);
6831 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
6832 "Monitor tunnel request from client %u completed\n",
6834 GNUNET_SERVER_receive_done (client, GNUNET_OK);
6839 * Functions to handle messages from clients
6841 static struct GNUNET_SERVER_MessageHandler client_handlers[] = {
6842 {&handle_local_new_client, NULL,
6843 GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT, 0},
6844 {&handle_local_channel_create, NULL,
6845 GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE,
6846 sizeof (struct GNUNET_MESH_ChannelMessage)},
6847 {&handle_local_channel_destroy, NULL,
6848 GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY,
6849 sizeof (struct GNUNET_MESH_ChannelMessage)},
6850 {&handle_local_data, NULL,
6851 GNUNET_MESSAGE_TYPE_MESH_LOCAL_DATA, 0},
6852 {&handle_local_ack, NULL,
6853 GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK,
6854 sizeof (struct GNUNET_MESH_LocalAck)},
6855 {&handle_local_get_tunnels, NULL,
6856 GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_TUNNELS,
6857 sizeof (struct GNUNET_MessageHeader)},
6858 {&handle_local_show_tunnel, NULL,
6859 GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_TUNNEL,
6860 sizeof (struct GNUNET_MESH_LocalMonitor)},
6866 * Method called whenever a given peer connects.
6868 * @param cls closure
6869 * @param peer peer identity this notification is about
6872 core_connect (void *cls, const struct GNUNET_PeerIdentity *peer)
6874 struct MeshPeer *pi;
6875 struct MeshPeerPath *path;
6877 DEBUG_CONN ("Peer connected\n");
6878 DEBUG_CONN (" %s\n", GNUNET_i2s (&my_full_id));
6879 pi = peer_get (peer);
6882 DEBUG_CONN (" (self)\n");
6883 path = path_new (1);
6887 DEBUG_CONN (" %s\n", GNUNET_i2s (peer));
6888 path = path_new (2);
6889 path->peers[1] = pi->id;
6890 GNUNET_PEER_change_rc (pi->id, 1);
6891 GNUNET_STATISTICS_update (stats, "# peers", 1, GNUNET_NO);
6893 path->peers[0] = myid;
6894 GNUNET_PEER_change_rc (myid, 1);
6895 peer_add_path (pi, path, GNUNET_YES);
6897 pi->connections = GNUNET_CONTAINER_multihashmap_create (32, GNUNET_YES);
6903 * Method called whenever a peer disconnects.
6905 * @param cls closure
6906 * @param peer peer identity this notification is about
6909 core_disconnect (void *cls, const struct GNUNET_PeerIdentity *peer)
6911 struct MeshPeer *pi;
6913 DEBUG_CONN ("Peer disconnected\n");
6914 pi = GNUNET_CONTAINER_multihashmap_get (peers, &peer->hashPubKey);
6921 peer_remove_path (pi, myid, pi->id);
6923 GNUNET_CONTAINER_multihashmap_iterate (pi->connections,
6926 GNUNET_CONTAINER_multihashmap_destroy (pi->connections);
6927 pi->connections = NULL;
6930 DEBUG_CONN (" (self)\n");
6932 GNUNET_STATISTICS_update (stats, "# peers", -1, GNUNET_NO);
6939 * Install server (service) handlers and start listening to clients.
6944 GNUNET_SERVER_add_handlers (server_handle, client_handlers);
6945 GNUNET_SERVER_connect_notify (server_handle,
6946 &handle_local_client_connect, NULL);
6947 GNUNET_SERVER_disconnect_notify (server_handle,
6948 &handle_local_client_disconnect, NULL);
6949 nc = GNUNET_SERVER_notification_context_create (server_handle, 1);
6951 clients_head = NULL;
6952 clients_tail = NULL;
6954 GNUNET_SERVER_resume (server_handle);
6959 * To be called on core init/fail.
6961 * @param cls Closure (config)
6962 * @param identity the public identity of this peer
6965 core_init (void *cls,
6966 const struct GNUNET_PeerIdentity *identity)
6968 const struct GNUNET_CONFIGURATION_Handle *c = cls;
6971 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Core init\n");
6972 if (0 != memcmp (identity, &my_full_id, sizeof (my_full_id)))
6974 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, _("Wrong CORE service\n"));
6975 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
6977 GNUNET_i2s (identity));
6978 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
6980 GNUNET_i2s (&my_full_id));
6981 GNUNET_CORE_disconnect (core_handle);
6982 core_handle = GNUNET_CORE_connect (c, /* Main configuration */
6983 NULL, /* Closure passed to MESH functions */
6984 &core_init, /* Call core_init once connected */
6985 &core_connect, /* Handle connects */
6986 &core_disconnect, /* remove peers on disconnects */
6987 NULL, /* Don't notify about all incoming messages */
6988 GNUNET_NO, /* For header only in notification */
6989 NULL, /* Don't notify about all outbound messages */
6990 GNUNET_NO, /* For header-only out notification */
6991 core_handlers); /* Register these handlers */
7000 /******************************************************************************/
7001 /************************ MAIN FUNCTIONS ****************************/
7002 /******************************************************************************/
7005 * Iterator over tunnel hash map entries to destroy the tunnel during shutdown.
7007 * @param cls closure
7008 * @param key current key code
7009 * @param value value in the hash map
7010 * @return GNUNET_YES if we should continue to iterate,
7014 shutdown_tunnel (void *cls, const struct GNUNET_HashCode * key, void *value)
7016 struct MeshPeer *p = value;
7017 struct MeshTunnel2 *t = p->tunnel;
7026 * Task run during shutdown.
7032 shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
7034 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "shutting down\n");
7036 if (core_handle != NULL)
7038 GNUNET_CORE_disconnect (core_handle);
7041 GNUNET_CONTAINER_multihashmap_iterate (peers, &shutdown_tunnel, NULL);
7042 if (dht_handle != NULL)
7044 GNUNET_DHT_disconnect (dht_handle);
7049 GNUNET_SERVER_notification_context_destroy (nc);
7052 if (GNUNET_SCHEDULER_NO_TASK != announce_id_task)
7054 GNUNET_SCHEDULER_cancel (announce_id_task);
7055 announce_id_task = GNUNET_SCHEDULER_NO_TASK;
7057 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "shut down\n");
7062 * Process mesh requests.
7064 * @param cls closure
7065 * @param server the initialized server
7066 * @param c configuration to use
7069 run (void *cls, struct GNUNET_SERVER_Handle *server,
7070 const struct GNUNET_CONFIGURATION_Handle *c)
7073 struct GNUNET_CRYPTO_EccPrivateKey *pk;
7075 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "starting to run\n");
7076 server_handle = server;
7077 GNUNET_SERVER_suspend (server_handle);
7080 GNUNET_CONFIGURATION_get_value_filename (c, "PEER", "PRIVATE_KEY",
7083 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
7085 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
7086 "mesh", "peer/privatekey");
7087 GNUNET_SCHEDULER_shutdown ();
7092 GNUNET_CONFIGURATION_get_value_time (c, "MESH", "REFRESH_CONNECTION_TIME",
7093 &refresh_connection_time))
7095 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
7097 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
7098 "mesh", "refresh path time");
7099 GNUNET_SCHEDULER_shutdown ();
7104 GNUNET_CONFIGURATION_get_value_time (c, "MESH", "ID_ANNOUNCE_TIME",
7107 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
7109 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
7110 "mesh", "id announce time");
7111 GNUNET_SCHEDULER_shutdown ();
7116 GNUNET_CONFIGURATION_get_value_time (c, "MESH", "CONNECT_TIMEOUT",
7119 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
7121 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
7122 "mesh", "connect timeout");
7123 GNUNET_SCHEDULER_shutdown ();
7128 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "MAX_MSGS_QUEUE",
7131 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
7133 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
7134 "mesh", "max msgs queue");
7135 GNUNET_SCHEDULER_shutdown ();
7140 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "MAX_CONNECTIONS",
7143 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
7145 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
7146 "mesh", "max tunnels");
7147 GNUNET_SCHEDULER_shutdown ();
7152 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "DEFAULT_TTL",
7155 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
7157 ("%s service is lacking key configuration settings (%s). Using default (%u).\n"),
7158 "mesh", "default ttl", 64);
7163 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "MAX_PEERS",
7166 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
7167 _("%s service is lacking key configuration settings (%s). Using default (%u).\n"),
7168 "mesh", "max peers", 1000);
7173 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "DROP_PERCENT",
7180 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
7181 "Mesh is running with drop mode enabled. "
7182 "This is NOT a good idea! "
7183 "Remove the DROP_PERCENT option from your configuration.\n");
7187 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "DHT_REPLICATION_LEVEL",
7188 &dht_replication_level))
7190 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
7192 ("%s service is lacking key configuration settings (%s). Using default (%u).\n"),
7193 "mesh", "dht replication level", 3);
7194 dht_replication_level = 3;
7197 connections = GNUNET_CONTAINER_multihashmap_create (32, GNUNET_YES);
7198 peers = GNUNET_CONTAINER_multihashmap_create (32, GNUNET_NO);
7199 ports = GNUNET_CONTAINER_multihashmap32_create (32);
7201 dht_handle = GNUNET_DHT_connect (c, 64);
7202 if (NULL == dht_handle)
7206 stats = GNUNET_STATISTICS_create ("mesh", c);
7208 /* Scheduled the task to clean up when shutdown is called */
7209 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &shutdown_task,
7211 pk = GNUNET_CRYPTO_ecc_key_create_from_file (keyfile);
7212 GNUNET_free (keyfile);
7213 GNUNET_assert (NULL != pk);
7214 my_private_key = pk;
7215 GNUNET_CRYPTO_ecc_key_get_public (my_private_key, &my_public_key);
7216 GNUNET_CRYPTO_hash (&my_public_key, sizeof (my_public_key),
7217 &my_full_id.hashPubKey);
7218 myid = GNUNET_PEER_intern (&my_full_id);
7219 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
7220 "Mesh for peer [%s] starting\n",
7221 GNUNET_i2s(&my_full_id));
7223 core_handle = GNUNET_CORE_connect (c, /* Main configuration */
7224 NULL, /* Closure passed to MESH functions */
7225 &core_init, /* Call core_init once connected */
7226 &core_connect, /* Handle connects */
7227 &core_disconnect, /* remove peers on disconnects */
7228 NULL, /* Don't notify about all incoming messages */
7229 GNUNET_NO, /* For header only in notification */
7230 NULL, /* Don't notify about all outbound messages */
7231 GNUNET_NO, /* For header-only out notification */
7232 core_handlers); /* Register these handlers */
7233 if (NULL == core_handle)
7236 GNUNET_SCHEDULER_shutdown ();
7239 announce_id_task = GNUNET_SCHEDULER_add_now (&announce_id, cls);
7240 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Mesh service running\n");
7245 * The main function for the mesh service.
7247 * @param argc number of arguments from the command line
7248 * @param argv command line arguments
7249 * @return 0 ok, 1 on error
7252 main (int argc, char *const *argv)
7257 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "main()\n");
7258 r = GNUNET_SERVICE_run (argc, argv, "mesh", GNUNET_SERVICE_OPTION_NONE, &run,
7260 ret = (GNUNET_OK == r) ? 0 : 1;
7261 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "main() END\n");