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;
1845 case GNUNET_MESSAGE_TYPE_MESH_FWD:
1846 case GNUNET_MESSAGE_TYPE_MESH_BCK:
1847 emsg = (struct GNUNET_MESH_Encrypted *) data;
1848 ttl = ntohl (emsg->ttl);
1851 GNUNET_break_op (0);
1855 emsg->ttl = htonl (ttl - 1);
1856 emsg->pid = htonl (fwd ? c->fwd_fc.next_pid++ : c->bck_fc.next_pid++);
1857 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " pid %u\n", ntohl (emsg->pid));
1860 case GNUNET_MESSAGE_TYPE_MESH_ACK:
1861 amsg = (struct GNUNET_MESH_ACK *) data;
1863 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ack %u\n", ntohl (amsg->ack));
1866 case GNUNET_MESSAGE_TYPE_MESH_POLL:
1867 pmsg = (struct GNUNET_MESH_Poll *) data;
1869 pmsg->pid = htonl (fwd ? c->fwd_fc.last_pid_sent : c->bck_fc.last_pid_sent);
1870 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " poll %u\n", ntohl (pmsg->pid));
1887 * Sends an already built message on a tunnel, choosing the best connection.
1889 * @param message Message to send. Function modifies it.
1890 * @param t Tunnel on which this message is transmitted.
1891 * @param ch Channel on which this message is transmitted.
1892 * @param fwd Is this a fwd message?
1895 send_prebuilt_message_tunnel (struct GNUNET_MESH_Encrypted *msg,
1896 struct MeshTunnel2 *t,
1897 struct MeshChannel *ch,
1900 struct MeshConnection *c;
1903 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Send on Tunnel %s\n",
1905 c = tunnel_get_connection (t, fwd);
1908 GNUNET_break (GNUNET_YES == t->destroy);
1911 type = ntohs (msg->header.type);
1914 case GNUNET_MESSAGE_TYPE_MESH_FWD:
1915 case GNUNET_MESSAGE_TYPE_MESH_BCK:
1916 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE:
1917 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY:
1919 msg->ttl = htonl (default_ttl);
1922 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "unkown type %s\n",
1923 GNUNET_MESH_DEBUG_M2S (type));
1928 send_prebuilt_message_connection (&msg->header, c, ch, fwd);
1933 * Sends an already built message on a channel, properly registering
1934 * all used resources and encrypting the message with the tunnel's key.
1936 * @param message Message to send. Function makes a copy of it.
1937 * @param ch Channel on which this message is transmitted.
1938 * @param fwd Is this a fwd message?
1941 send_prebuilt_message_channel (const struct GNUNET_MessageHeader *message,
1942 struct MeshChannel *ch,
1945 struct GNUNET_MESH_Encrypted *msg;
1946 size_t size = ntohs (message->size);
1947 char *cbuf[sizeof (struct GNUNET_MESH_Encrypted) + size];
1951 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Send on Channel %s:%X\n",
1952 peer2s (ch->t->peer), ch->gid);
1953 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " %s\n",
1954 GNUNET_MESH_DEBUG_M2S (ntohs (message->type)));
1956 if (channel_is_terminal (ch, fwd))
1958 handle_decrypted (ch->t, message, fwd);
1962 type = fwd ? GNUNET_MESSAGE_TYPE_MESH_FWD : GNUNET_MESSAGE_TYPE_MESH_BCK;
1963 iv = GNUNET_CRYPTO_random_u64 (GNUNET_CRYPTO_QUALITY_NONCE, UINT64_MAX);
1965 msg = (struct GNUNET_MESH_Encrypted *) cbuf;
1966 msg->header.type = htons (type);
1967 msg->header.size = htons (sizeof (struct GNUNET_MESH_Encrypted) + size);
1968 msg->iv = GNUNET_htonll (iv);
1969 tunnel_encrypt (ch->t, &msg[1], message, size, iv, fwd);
1970 send_prebuilt_message_tunnel (msg, ch->t, ch, fwd);
1975 * Sends a CREATE CONNECTION message for a path to a peer.
1976 * Changes the connection and tunnel states if necessary.
1978 * @param connection Connection to create.
1981 send_connection_create (struct MeshConnection *connection)
1983 struct MeshTunnel2 *t;
1986 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Send connection create\n");
1988 GNUNET_MESSAGE_TYPE_MESH_CONNECTION_CREATE,
1989 sizeof (struct GNUNET_MESH_ConnectionCreate) +
1990 (connection->path->length *
1991 sizeof (struct GNUNET_PeerIdentity)),
1996 (MESH_TUNNEL_SEARCHING == t->state || MESH_TUNNEL_NEW == t->state))
1997 tunnel_change_state (t, MESH_TUNNEL_WAITING);
1998 if (MESH_CONNECTION_NEW == connection->state)
1999 connection_change_state (connection, MESH_CONNECTION_SENT);
2004 * Sends a CONNECTION ACK message in reponse to a received CONNECTION_CREATE
2007 * @param connection Connection to confirm.
2008 * @param fwd Is this a fwd ACK? (First is bck (SYNACK), second is fwd (ACK))
2011 send_connection_ack (struct MeshConnection *connection, int fwd)
2013 struct MeshTunnel2 *t;
2016 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Send connection ack\n");
2018 GNUNET_MESSAGE_TYPE_MESH_CONNECTION_ACK,
2019 sizeof (struct GNUNET_MESH_ConnectionACK),
2023 if (MESH_TUNNEL_NEW == t->state)
2024 tunnel_change_state (t, MESH_TUNNEL_WAITING);
2029 * Core callback to write a pre-constructed data packet to core buffer
2031 * @param cls Closure (MeshTransmissionDescriptor with data in "data" member).
2032 * @param size Number of bytes available in buf.
2033 * @param buf Where the to write the message.
2035 * @return number of bytes written to buf
2038 send_core_data_raw (void *cls, size_t size, void *buf)
2040 struct GNUNET_MessageHeader *msg = cls;
2043 GNUNET_assert (NULL != msg);
2044 total_size = ntohs (msg->size);
2046 if (total_size > size)
2051 memcpy (buf, msg, total_size);
2058 * Function to send a create connection message to a peer.
2060 * @param c Connection to create.
2061 * @param size number of bytes available in buf
2062 * @param buf where the callee should write the message
2063 * @return number of bytes written to buf
2066 send_core_connection_create (struct MeshConnection *c, size_t size, void *buf)
2068 struct GNUNET_MESH_ConnectionCreate *msg;
2069 struct GNUNET_PeerIdentity *peer_ptr;
2070 struct MeshPeerPath *p = c->path;
2074 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Sending CONNECTION CREATE...\n");
2076 sizeof (struct GNUNET_MESH_ConnectionCreate) +
2077 p->length * sizeof (struct GNUNET_PeerIdentity);
2079 if (size < size_needed || NULL == buf)
2084 msg = (struct GNUNET_MESH_ConnectionCreate *) buf;
2085 msg->header.size = htons (size_needed);
2086 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CONNECTION_CREATE);
2089 peer_ptr = (struct GNUNET_PeerIdentity *) &msg[1];
2090 for (i = 0; i < p->length; i++)
2092 GNUNET_PEER_resolve (p->peers[i], peer_ptr++);
2095 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2096 "CONNECTION CREATE (%u bytes long) sent!\n", size_needed);
2102 * Creates a path ack message in buf and frees all unused resources.
2104 * @param c Connection to send an ACK on.
2105 * @param size number of bytes available in buf
2106 * @param buf where the callee should write the message
2108 * @return number of bytes written to buf
2111 send_core_connection_ack (struct MeshConnection *c, size_t size, void *buf)
2113 struct GNUNET_MESH_ConnectionACK *msg = buf;
2114 struct MeshTunnel2 *t = c->t;
2116 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Sending CONNECTION ACK...\n");
2117 GNUNET_assert (NULL != t);
2118 if (sizeof (struct GNUNET_MESH_ConnectionACK) > size)
2123 msg->header.size = htons (sizeof (struct GNUNET_MESH_ConnectionACK));
2124 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CONNECTION_ACK);
2127 /* TODO add signature */
2129 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "CONNECTION ACK sent!\n");
2130 return sizeof (struct GNUNET_MESH_ConnectionACK);
2135 * Destroy the peer_info and free any allocated resources linked to it
2137 * @param peer The peer_info to destroy.
2139 * @return GNUNET_OK on success
2142 peer_destroy (struct MeshPeer *peer)
2144 struct GNUNET_PeerIdentity id;
2145 struct MeshPeerPath *p;
2146 struct MeshPeerPath *nextp;
2148 GNUNET_PEER_resolve (peer->id, &id);
2149 GNUNET_PEER_change_rc (peer->id, -1);
2152 GNUNET_CONTAINER_multihashmap_remove (peers, &id.hashPubKey, peer))
2155 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2156 "removing peer %s, not in hashmap\n", GNUNET_i2s (&id));
2158 if (NULL != peer->dhtget)
2160 GNUNET_DHT_get_stop (peer->dhtget);
2162 p = peer->path_head;
2166 GNUNET_CONTAINER_DLL_remove (peer->path_head, peer->path_tail, p);
2170 tunnel_destroy_empty (peer->tunnel);
2177 * Returns if peer is used (has a tunnel, is neighbor).
2179 * @peer Peer to check.
2181 * @return GNUNET_YES if peer is in use.
2184 peer_is_used (struct MeshPeer *peer)
2186 struct MeshPeerPath *p;
2188 if (NULL != peer->tunnel)
2191 for (p = peer->path_head; NULL != p; p = p->next)
2200 * Iterator over all the peers to get the oldest timestamp.
2202 * @param cls Closure (unsued).
2203 * @param key ID of the peer.
2204 * @param value Peer_Info of the peer.
2207 peer_get_oldest (void *cls,
2208 const struct GNUNET_HashCode *key,
2211 struct MeshPeer *p = value;
2212 struct GNUNET_TIME_Absolute *abs = cls;
2214 /* Don't count active peers */
2215 if (GNUNET_YES == peer_is_used (p))
2218 if (abs->abs_value_us < p->last_contact.abs_value_us)
2219 abs->abs_value_us = p->last_contact.abs_value_us;
2226 * Iterator over all the peers to remove the oldest entry.
2228 * @param cls Closure (unsued).
2229 * @param key ID of the peer.
2230 * @param value Peer_Info of the peer.
2233 peer_timeout (void *cls,
2234 const struct GNUNET_HashCode *key,
2237 struct MeshPeer *p = value;
2238 struct GNUNET_TIME_Absolute *abs = cls;
2240 if (p->last_contact.abs_value_us == abs->abs_value_us &&
2241 GNUNET_NO == peer_is_used (p))
2251 * Delete oldest unused peer.
2254 peer_delete_oldest (void)
2256 struct GNUNET_TIME_Absolute abs;
2258 abs = GNUNET_TIME_UNIT_FOREVER_ABS;
2260 GNUNET_CONTAINER_multihashmap_iterate (peers,
2263 GNUNET_CONTAINER_multihashmap_iterate (peers,
2270 * Retrieve the MeshPeer stucture associated with the peer, create one
2271 * and insert it in the appropriate structures if the peer is not known yet.
2273 * @param peer Full identity of the peer.
2275 * @return Existing or newly created peer info.
2277 static struct MeshPeer *
2278 peer_get (const struct GNUNET_PeerIdentity *peer_id)
2280 struct MeshPeer *peer;
2282 peer = GNUNET_CONTAINER_multihashmap_get (peers, &peer_id->hashPubKey);
2285 peer = GNUNET_new (struct MeshPeer);
2286 if (GNUNET_CONTAINER_multihashmap_size (peers) > max_peers)
2288 peer_delete_oldest ();
2290 GNUNET_CONTAINER_multihashmap_put (peers, &peer_id->hashPubKey, peer,
2291 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST);
2292 peer->id = GNUNET_PEER_intern (peer_id);
2294 peer->last_contact = GNUNET_TIME_absolute_get();
2301 * Retrieve the MeshPeer stucture associated with the peer, create one
2302 * and insert it in the appropriate structures if the peer is not known yet.
2304 * @param peer Short identity of the peer.
2306 * @return Existing or newly created peer info.
2308 static struct MeshPeer *
2309 peer_get_short (const GNUNET_PEER_Id peer)
2311 return peer_get (GNUNET_PEER_resolve2 (peer));
2316 * Get a cost of a path for a peer considering existing tunnel connections.
2318 * @param peer Peer towards which the path is considered.
2319 * @param path Candidate path.
2321 * @return Cost of the path (path length + number of overlapping nodes)
2324 peer_get_path_cost (const struct MeshPeer *peer,
2325 const struct MeshPeerPath *path)
2327 struct MeshConnection *c;
2328 unsigned int overlap;
2336 GNUNET_assert (NULL != peer->tunnel);
2338 for (i = 0; i < path->length; i++)
2340 for (c = peer->tunnel->connection_head; NULL != c; c = c->next)
2342 for (j = 0; j < c->path->length; j++)
2344 if (path->peers[i] == c->path->peers[j])
2352 return (path->length + overlap) * (path->score * -1);
2357 * Choose the best path towards a peer considering the tunnel properties.
2359 * @param peer The destination peer.
2361 * @return Best current known path towards the peer, if any.
2363 static struct MeshPeerPath *
2364 peer_get_best_path (const struct MeshPeer *peer)
2366 struct MeshPeerPath *best_p;
2367 struct MeshPeerPath *p;
2368 struct MeshConnection *c;
2369 unsigned int best_cost;
2372 best_cost = UINT_MAX;
2374 for (p = peer->path_head; NULL != p; p = p->next)
2376 for (c = peer->tunnel->connection_head; NULL != c; c = c->next)
2380 continue; /* If path is in use in a connection, skip it. */
2382 if ((cost = peer_get_path_cost (peer, p)) < best_cost)
2392 queue_is_sendable (struct MeshPeerQueue *q)
2394 struct MeshFlowControl *fc;
2396 /* Is PID-independent? */
2399 case GNUNET_MESSAGE_TYPE_MESH_ACK:
2400 case GNUNET_MESSAGE_TYPE_MESH_POLL:
2404 /* Is PID allowed? */
2405 fc = q->fwd ? &q->c->fwd_fc : &q->c->bck_fc;
2406 if (GMC_is_pid_bigger (fc->last_ack_recv, fc->last_pid_sent))
2414 * Get first sendable message.
2416 * @param peer The destination peer.
2418 * @return Best current known path towards the peer, if any.
2420 static struct MeshPeerQueue *
2421 peer_get_first_message (const struct MeshPeer *peer)
2423 struct MeshPeerQueue *q;
2425 for (q = peer->queue_head; NULL != q; q = q->next)
2427 if (queue_is_sendable (q))
2436 * Try to establish a new connection to this peer in the given tunnel.
2437 * If the peer doesn't have any path to it yet, try to get one.
2438 * If the peer already has some path, send a CREATE CONNECTION towards it.
2440 * @param peer PeerInfo of the peer.
2443 peer_connect (struct MeshPeer *peer)
2445 struct MeshTunnel2 *t;
2446 struct MeshPeerPath *p;
2447 struct MeshConnection *c;
2449 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2450 "peer_connect towards %s\n",
2453 if (NULL != peer->path_head)
2455 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "path exists\n");
2456 p = peer_get_best_path (peer);
2459 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " %u hops\n", p->length);
2460 c = tunnel_use_path (t, p);
2461 send_connection_create (c);
2464 else if (NULL == peer->dhtget)
2466 const struct GNUNET_PeerIdentity *id;
2468 id = GNUNET_PEER_resolve2 (peer->id);
2469 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2470 " Starting DHT GET for peer %s\n", peer2s (peer));
2471 peer->dhtget = GNUNET_DHT_get_start (dht_handle, /* handle */
2472 GNUNET_BLOCK_TYPE_MESH_PEER, /* type */
2473 &id->hashPubKey, /* key to search */
2474 dht_replication_level, /* replication level */
2475 GNUNET_DHT_RO_RECORD_ROUTE |
2476 GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE,
2478 0, /* xquery bits */
2479 &dht_get_id_handler, peer);
2480 if (MESH_TUNNEL_NEW == t->state)
2481 tunnel_change_state (t, MESH_TUNNEL_SEARCHING);
2485 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2486 "There is no path but the DHT GET is already started.\n");
2492 * Get the first transmittable message for a connection.
2494 * @param c Connection.
2495 * @param fwd Is this FWD?
2497 * @return First transmittable message.
2499 static struct MeshPeerQueue *
2500 connection_get_first_message (struct MeshConnection *c, int fwd)
2502 struct MeshPeerQueue *q;
2505 p = connection_get_hop (c, fwd);
2507 for (q = p->queue_head; NULL != q; q = q->next)
2511 if (queue_is_sendable (q))
2520 * @brief Re-initiate traffic on this connection if necessary.
2522 * Check if there is traffic queued towards this peer
2523 * and the core transmit handle is NULL (traffic was stalled).
2524 * If so, call core tmt rdy.
2526 * @param c Connection on which initiate traffic.
2527 * @param fwd Is this about fwd traffic?
2530 connection_unlock_queue (struct MeshConnection *c, int fwd)
2532 struct MeshPeer *peer;
2533 struct MeshPeerQueue *q;
2536 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2537 "connection_unlock_queue %s on %s\n",
2538 fwd ? "FWD" : "BCK", GNUNET_h2s (&c->id));
2540 if (connection_is_origin (c, fwd))
2542 struct MeshTunnel2 *t = c->t;
2543 struct MeshChannel *ch;
2544 struct MeshChannelReliability *rel;
2546 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " is origin!\n");
2547 /* FIXME randomize channel selection, not always first channel */
2548 for (ch = t->channel_head; NULL != ch; ch = ch->next)
2550 rel = fwd ? ch->root_rel : ch->dest_rel;
2552 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " channel %X - %s\n",
2553 ch->gid, rel->client_ready ? "ready " : "not ready");
2554 if (GNUNET_NO == rel->client_ready)
2556 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " sending local ack!\n");
2557 send_local_ack (ch, fwd);
2558 return; /* FIXME authorize all channels? */
2564 peer = connection_get_hop (c, fwd);
2566 if (NULL != peer->core_transmit)
2568 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " already unlocked!\n");
2569 return; /* Already unlocked */
2572 q = connection_get_first_message (c, fwd);
2575 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " queue empty!\n");
2576 return; /* Nothing to transmit */
2580 peer->core_transmit =
2581 GNUNET_CORE_notify_transmit_ready (core_handle,
2584 GNUNET_TIME_UNIT_FOREVER_REL,
2585 GNUNET_PEER_resolve2 (peer->id),
2593 * Cancel all transmissions that belong to a certain connection.
2595 * @param c Connection which to cancel.
2596 * @param fwd Cancel fwd traffic?
2599 connection_cancel_queues (struct MeshConnection *c, int fwd)
2601 struct MeshPeerQueue *q;
2602 struct MeshPeerQueue *next;
2603 struct MeshFlowControl *fc;
2604 struct MeshPeer *peer;
2611 fc = fwd ? &c->fwd_fc : &c->bck_fc;
2612 peer = connection_get_hop (c, fwd);
2614 for (q = peer->queue_head; NULL != q; q = next)
2619 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2620 "connection_cancel_queue %s\n",
2621 GNUNET_MESH_DEBUG_M2S (q->type));
2622 queue_destroy (q, GNUNET_YES);
2625 if (NULL == peer->queue_head)
2627 if (NULL != peer->core_transmit)
2629 GNUNET_CORE_notify_transmit_ready_cancel (peer->core_transmit);
2630 peer->core_transmit = NULL;
2632 if (GNUNET_SCHEDULER_NO_TASK != fc->poll_task)
2634 GNUNET_SCHEDULER_cancel (fc->poll_task);
2635 fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
2642 * Remove all paths that rely on a direct connection between p1 and p2
2643 * from the peer itself and notify all tunnels about it.
2645 * @param peer PeerInfo of affected peer.
2646 * @param p1 GNUNET_PEER_Id of one peer.
2647 * @param p2 GNUNET_PEER_Id of another peer that was connected to the first and
2650 * TODO: optimize (see below)
2653 peer_remove_path (struct MeshPeer *peer, GNUNET_PEER_Id p1,
2656 struct MeshPeerPath *p;
2657 struct MeshPeerPath *next;
2658 struct MeshPeer *peer_d;
2660 unsigned int destroyed;
2663 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "peer_info_remove_path\n");
2665 for (p = peer->path_head; NULL != p; p = next)
2668 for (i = 0; i < (p->length - 1); i++)
2670 if ((p->peers[i] == p1 && p->peers[i + 1] == p2) ||
2671 (p->peers[i] == p2 && p->peers[i + 1] == p1))
2673 GNUNET_CONTAINER_DLL_remove (peer->path_head, peer->path_tail, p);
2684 d = tunnel_notify_connection_broken (peer->tunnel, p1, p2);
2686 peer_d = peer_get_short (d); // FIXME
2687 next = peer_get_best_path (peer_d);
2688 tunnel_use_path (peer->tunnel, next);
2689 peer_connect (peer_d);
2691 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "peer_info_remove_path END\n");
2696 * Add the path to the peer and update the path used to reach it in case this
2699 * @param peer_info Destination peer to add the path to.
2700 * @param path New path to add. Last peer must be the peer in arg 1.
2701 * Path will be either used of freed if already known.
2702 * @param trusted Do we trust that this path is real?
2705 peer_add_path (struct MeshPeer *peer_info, struct MeshPeerPath *path,
2708 struct MeshPeerPath *aux;
2712 if ((NULL == peer_info) || (NULL == path))
2715 path_destroy (path);
2718 if (path->peers[path->length - 1] != peer_info->id)
2721 path_destroy (path);
2724 if (2 >= path->length && GNUNET_NO == trusted)
2726 /* Only allow CORE to tell us about direct paths */
2727 path_destroy (path);
2730 for (l = 1; l < path->length; l++)
2732 if (path->peers[l] == myid)
2734 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "shortening path by %u\n", l);
2735 for (l2 = 0; l2 < path->length - l; l2++)
2737 path->peers[l2] = path->peers[l + l2];
2742 GNUNET_realloc (path->peers, path->length * sizeof (GNUNET_PEER_Id));
2746 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "adding path [%u] to peer %s\n",
2747 path->length, peer2s (peer_info));
2749 l = path_get_length (path);
2752 path_destroy (path);
2756 GNUNET_assert (peer_info->id == path->peers[path->length - 1]);
2757 for (aux = peer_info->path_head; aux != NULL; aux = aux->next)
2759 l2 = path_get_length (aux);
2762 GNUNET_CONTAINER_DLL_insert_before (peer_info->path_head,
2763 peer_info->path_tail, aux, path);
2768 if (l2 == l && memcmp (path->peers, aux->peers, l) == 0)
2770 path_destroy (path);
2775 GNUNET_CONTAINER_DLL_insert_tail (peer_info->path_head, peer_info->path_tail,
2782 * Add the path to the origin peer and update the path used to reach it in case
2783 * this is the shortest.
2784 * The path is given in peer_info -> destination, therefore we turn the path
2785 * upside down first.
2787 * @param peer_info Peer to add the path to, being the origin of the path.
2788 * @param path New path to add after being inversed.
2789 * Path will be either used or freed.
2790 * @param trusted Do we trust that this path is real?
2793 peer_add_path_to_origin (struct MeshPeer *peer_info,
2794 struct MeshPeerPath *path, int trusted)
2797 peer_add_path (peer_info, path, trusted);
2803 * Function called if a connection has been stalled for a while,
2804 * possibly due to a missed ACK. Poll the neighbor about its ACK status.
2806 * @param cls Closure (poll ctx).
2807 * @param tc TaskContext.
2810 connection_poll (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
2812 struct MeshFlowControl *fc = cls;
2813 struct GNUNET_MESH_Poll msg;
2814 struct MeshConnection *c;
2816 fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
2817 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
2823 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " *** Polling!\n");
2824 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " *** connection %s[%X]\n",
2825 peer2s (c->t->peer), c->id);
2826 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " *** %s\n",
2827 fc == &c->fwd_fc ? "FWD" : "BCK");
2829 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_POLL);
2830 msg.header.size = htons (sizeof (msg));
2831 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " *** pid (%u)!\n", fc->last_pid_sent);
2832 send_prebuilt_message_connection (&msg.header, c, NULL, fc == &c->fwd_fc);
2833 fc->poll_time = GNUNET_TIME_STD_BACKOFF (fc->poll_time);
2834 fc->poll_task = GNUNET_SCHEDULER_add_delayed (fc->poll_time,
2835 &connection_poll, fc);
2840 * Build a PeerPath from the paths returned from the DHT, reversing the paths
2841 * to obtain a local peer -> destination path and interning the peer ids.
2843 * @return Newly allocated and created path
2845 static struct MeshPeerPath *
2846 path_build_from_dht (const struct GNUNET_PeerIdentity *get_path,
2847 unsigned int get_path_length,
2848 const struct GNUNET_PeerIdentity *put_path,
2849 unsigned int put_path_length)
2851 struct MeshPeerPath *p;
2857 GNUNET_PEER_change_rc (myid, 1);
2858 i = get_path_length;
2859 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " GET has %d hops.\n", i);
2860 for (i--; i >= 0; i--)
2862 id = GNUNET_PEER_intern (&get_path[i]);
2863 if (p->length > 0 && id == p->peers[p->length - 1])
2865 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Optimizing 1 hop out.\n");
2866 GNUNET_PEER_change_rc (id, -1);
2870 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Adding from GET: %s.\n",
2871 GNUNET_i2s (&get_path[i]));
2873 p->peers = GNUNET_realloc (p->peers, sizeof (GNUNET_PEER_Id) * p->length);
2874 p->peers[p->length - 1] = id;
2877 i = put_path_length;
2878 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " PUT has %d hops.\n", i);
2879 for (i--; i >= 0; i--)
2881 id = GNUNET_PEER_intern (&put_path[i]);
2884 /* PUT path went through us, so discard the path up until now and start
2885 * from here to get a much shorter (and loop-free) path.
2890 if (p->length > 0 && id == p->peers[p->length - 1])
2892 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Optimizing 1 hop out.\n");
2893 GNUNET_PEER_change_rc (id, -1);
2897 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Adding from PUT: %s.\n",
2898 GNUNET_i2s (&put_path[i]));
2900 p->peers = GNUNET_realloc (p->peers, sizeof (GNUNET_PEER_Id) * p->length);
2901 p->peers[p->length - 1] = id;
2905 if (get_path_length > 0)
2906 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " (first of GET: %s)\n",
2907 GNUNET_i2s (&get_path[0]));
2908 if (put_path_length > 0)
2909 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " (first of PUT: %s)\n",
2910 GNUNET_i2s (&put_path[0]));
2911 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " In total: %d hops\n",
2913 for (i = 0; i < p->length; i++)
2915 struct GNUNET_PeerIdentity peer_id;
2917 GNUNET_PEER_resolve (p->peers[i], &peer_id);
2918 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " %u: %s\n", p->peers[i],
2919 GNUNET_i2s (&peer_id));
2927 * Adds a path to the peer_infos of all the peers in the path
2929 * @param p Path to process.
2930 * @param confirmed Whether we know if the path works or not.
2933 path_add_to_peers (struct MeshPeerPath *p, int confirmed)
2937 /* TODO: invert and add */
2938 for (i = 0; i < p->length && p->peers[i] != myid; i++) /* skip'em */ ;
2939 for (i++; i < p->length; i++)
2941 struct MeshPeer *aux;
2942 struct MeshPeerPath *copy;
2944 aux = peer_get_short (p->peers[i]);
2945 copy = path_duplicate (p);
2946 copy->length = i + 1;
2947 peer_add_path (aux, copy, p->length < 3 ? GNUNET_NO : confirmed);
2953 * Search for a channel among the channels for a client
2955 * @param c the client whose channels to search in
2956 * @param chid the local id of the channel
2958 * @return channel handler, NULL if doesn't exist
2960 static struct MeshChannel *
2961 channel_get_by_local_id (struct MeshClient *c, MESH_ChannelNumber chid)
2963 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " -- get CHID %X\n", chid);
2964 if (0 == (chid & GNUNET_MESH_LOCAL_CHANNEL_ID_CLI))
2966 GNUNET_break_op (0);
2967 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "CHID %X not a local chid\n", chid);
2970 if (chid >= GNUNET_MESH_LOCAL_CHANNEL_ID_SERV)
2971 return GNUNET_CONTAINER_multihashmap32_get (c->incoming_channels, chid);
2972 return GNUNET_CONTAINER_multihashmap32_get (c->own_channels, chid);
2978 channel_debug (struct MeshChannel *ch)
2982 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "*** DEBUG NULL CHANNEL ***\n");
2985 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Channel %s:%X\n",
2986 peer2s (ch->t->peer), ch->gid);
2987 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " root %p/%p\n",
2988 ch->root, ch->root_rel);
2989 if (NULL != ch->root)
2991 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " cli %u\n", ch->root->id);
2992 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ready %s\n",
2993 ch->root_rel->client_ready ? "YES" : "NO");
2994 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " id %X\n", ch->lid_root);
2996 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " root %p/%p\n",
2997 ch->dest, ch->dest_rel);
2998 if (NULL != ch->dest)
3000 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " cli %u\n", ch->dest->id);
3001 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ready %s\n",
3002 ch->dest_rel->client_ready ? "YES" : "NO");
3003 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " id %X\n", ch->lid_dest);
3008 fc_debug (struct MeshFlowControl *fc)
3010 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " IN: %u/%u\n",
3011 fc->last_pid_recv, fc->last_ack_sent);
3012 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " OUT: %u/%u\n",
3013 fc->last_pid_sent, fc->last_ack_recv);
3014 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " QUEUE: %u/%u\n",
3015 fc->queue_n, fc->queue_max);
3019 connection_debug (struct MeshConnection *c)
3023 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "*** DEBUG NULL CONNECTION ***\n");
3026 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Connection %s:%X\n",
3027 peer2s (c->t->peer), GNUNET_h2s (&c->id));
3028 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " state: %u, pending msgs: %u\n",
3029 c->state, c->pending_messages);
3030 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " FWD FC\n");
3031 fc_debug (&c->fwd_fc);
3032 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " BCK FC\n");
3033 fc_debug (&c->bck_fc);
3038 static struct MeshChannel *
3039 channel_get (struct MeshTunnel2 *t, MESH_ChannelNumber chid)
3041 struct MeshChannel *ch;
3046 for (ch = t->channel_head; NULL != ch; ch = ch->next)
3048 if (ch->gid == chid)
3057 * Change the tunnel state.
3059 * @param t Tunnel whose state to change.
3060 * @param state New state.
3063 tunnel_change_state (struct MeshTunnel2* t, enum MeshTunnelState state)
3067 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3068 "Tunnel %s state was %s\n",
3070 GNUNET_MESH_DEBUG_TS2S (t->state));
3071 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3072 "Tunnel %s state is now %s\n",
3074 GNUNET_MESH_DEBUG_TS2S (state));
3080 * Cache a message to be sent once tunnel is online.
3082 * @param t Tunnel to hold the message.
3083 * @param ch Channel the message is about.
3084 * @param msg Message itself (copy will be made).
3085 * @param fwd Is this fwd?
3088 tunnel_queue_data (struct MeshTunnel2 *t,
3089 struct MeshChannel *ch,
3090 struct GNUNET_MessageHeader *msg,
3093 struct MeshTunnelQueue *tq;
3094 uint16_t size = ntohs (msg->size);
3096 tq = GNUNET_malloc (sizeof (struct MeshTunnelQueue) + size);
3099 memcpy (&tq[1], msg, size);
3100 GNUNET_CONTAINER_DLL_insert_tail (t->tq_head, t->tq_tail, tq);
3105 * Send all cached messages that we can, tunnel is online.
3107 * @param t Tunnel that holds the messages.
3108 * @param fwd Is this fwd?
3111 tunnel_send_queued_data (struct MeshTunnel2 *t, int fwd)
3113 struct MeshTunnelQueue *tq;
3114 struct MeshTunnelQueue *next;
3117 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3118 "tunnel_send_queued_data on tunnel %s\n",
3120 room = tunnel_get_buffer (t, fwd);
3121 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " buffer space: %u\n", room);
3122 for (tq = t->tq_head; NULL != tq && room > 0; tq = next)
3126 GNUNET_CONTAINER_DLL_remove (t->tq_head, t->tq_tail, tq);
3127 send_prebuilt_message_channel ((struct GNUNET_MessageHeader *) &tq[1],
3136 connection_change_state (struct MeshConnection* c,
3137 enum MeshConnectionState state)
3139 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3140 "Connection %s state was %s\n",
3141 GNUNET_h2s (&c->id), GNUNET_MESH_DEBUG_CS2S (c->state));
3142 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3143 "Connection %s state is now %s\n",
3144 GNUNET_h2s (&c->id), GNUNET_MESH_DEBUG_CS2S (state));
3150 * Add a client to a channel, initializing all needed data structures.
3152 * @param ch Channel to which add the client.
3153 * @param c Client which to add to the channel.
3156 channel_add_client (struct MeshChannel *ch, struct MeshClient *c)
3158 struct MeshTunnel2 *t = ch->t;
3160 if (NULL != ch->dest)
3166 /* Assign local id as destination */
3167 while (NULL != channel_get_by_local_id (c, t->next_local_chid))
3168 t->next_local_chid = (t->next_local_chid + 1) | GNUNET_MESH_LOCAL_CHANNEL_ID_SERV;
3169 ch->lid_dest = t->next_local_chid++;
3170 t->next_local_chid = t->next_local_chid | GNUNET_MESH_LOCAL_CHANNEL_ID_SERV;
3172 /* Store in client's hashmap */
3174 GNUNET_CONTAINER_multihashmap32_put (c->incoming_channels,
3176 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST))
3182 GNUNET_break (NULL == ch->dest_rel);
3183 ch->dest_rel = GNUNET_new (struct MeshChannelReliability);
3184 ch->dest_rel->ch = ch;
3185 ch->dest_rel->expected_delay = MESH_RETRANSMIT_TIME;
3191 static struct MeshConnection *
3192 tunnel_use_path (struct MeshTunnel2 *t, struct MeshPeerPath *p)
3194 struct MeshConnection *c;
3195 struct GNUNET_HashCode cid;
3196 struct MeshPeer *peer;
3197 unsigned int own_pos;
3199 GNUNET_CRYPTO_hash_create_random (GNUNET_CRYPTO_QUALITY_NONCE, &cid);
3201 c = connection_new (&cid);
3203 for (own_pos = 0; own_pos < p->length; own_pos++)
3205 if (p->peers[own_pos] == myid)
3208 if (own_pos > p->length - 1)
3211 connection_destroy (c);
3214 c->own_pos = own_pos;
3219 c->fwd_maintenance_task =
3220 GNUNET_SCHEDULER_add_delayed (refresh_connection_time,
3221 &connection_fwd_keepalive, c);
3224 peer = connection_get_next_hop (c);
3225 GNUNET_CONTAINER_multihashmap_put (peer->connections, &c->id, c,
3226 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST);
3227 peer = connection_get_prev_hop (c);
3228 GNUNET_CONTAINER_multihashmap_put (peer->connections, &c->id, c,
3229 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST);
3235 * Notifies a tunnel that a connection has broken that affects at least
3236 * some of its peers. Sends a notification towards the root of the tree.
3237 * In case the peer is the owner of the tree, notifies the client that owns
3238 * the tunnel and tries to reconnect.
3240 * FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME
3242 * @param t Tunnel affected.
3243 * @param p1 Peer that got disconnected from p2.
3244 * @param p2 Peer that got disconnected from p1.
3246 * @return Short ID of the peer disconnected (either p1 or p2).
3247 * 0 if the tunnel remained unaffected.
3249 static GNUNET_PEER_Id
3250 tunnel_notify_connection_broken (struct MeshTunnel2* t,
3251 GNUNET_PEER_Id p1, GNUNET_PEER_Id p2)
3253 // if (myid != p1 && myid != p2) FIXME
3258 // if (tree_get_predecessor (t->tree) != 0)
3260 // /* We are the peer still connected, notify owner of the disconnection. */
3261 // struct GNUNET_MESH_PathBroken msg;
3262 // struct GNUNET_PeerIdentity neighbor;
3264 // msg.header.size = htons (sizeof (msg));
3265 // msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_BROKEN);
3266 // GNUNET_PEER_resolve (t->id.oid, &msg.oid);
3267 // msg.tid = htonl (t->id.tid);
3268 // msg.peer1 = my_full_id;
3269 // GNUNET_PEER_resolve (pid, &msg.peer2);
3270 // GNUNET_PEER_resolve (tree_get_predecessor (t->tree), &neighbor);
3271 // send_prebuilt_message (&msg.header, &neighbor, t);
3278 * Send an end-to-end ACK message for the most recent in-sequence payload.
3280 * If channel is not reliable, do nothing.
3282 * @param ch Channel this is about.
3283 * @param fwd Is for FWD traffic? (ACK dest->owner)
3286 channel_send_data_ack (struct MeshChannel *ch, int fwd)
3288 struct GNUNET_MESH_DataACK msg;
3289 struct MeshChannelReliability *rel;
3290 struct MeshReliableMessage *copy;
3295 if (GNUNET_NO == ch->reliable)
3299 rel = fwd ? ch->dest_rel : ch->root_rel;
3300 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3301 "send_data_ack for %u\n",
3304 type = GNUNET_MESSAGE_TYPE_MESH_DATA_ACK;
3305 msg.header.type = htons (type);
3306 msg.header.size = htons (sizeof (msg));
3307 msg.chid = htonl (ch->gid);
3308 msg.mid = htonl (rel->mid_recv - 1);
3310 for (copy = rel->head_recv; NULL != copy; copy = copy->next)
3312 if (copy->type != type)
3314 delta = copy->mid - rel->mid_recv;
3317 mask = 0x1LL << delta;
3318 msg.futures |= mask;
3319 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3320 " setting bit for %u (delta %u) (%llX) -> %llX\n",
3321 copy->mid, delta, mask, msg.futures);
3323 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " final futures %llX\n", msg.futures);
3325 send_prebuilt_message_channel (&msg.header, ch, fwd);
3326 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "send_data_ack END\n");
3331 * Send an ACK informing the predecessor about the available buffer space.
3333 * Note that for fwd ack, the FWD mean forward *traffic* (root->dest),
3334 * the ACK itself goes "back" (dest->root).
3336 * @param c Connection on which to send the ACK.
3337 * @param buffer How much space free to advertise?
3338 * @param fwd Is this FWD ACK? (Going dest->owner)
3341 connection_send_ack (struct MeshConnection *c, unsigned int buffer, int fwd)
3343 struct MeshFlowControl *next_fc;
3344 struct MeshFlowControl *prev_fc;
3345 struct GNUNET_MESH_ACK msg;
3349 next_fc = fwd ? &c->fwd_fc : &c->bck_fc;
3350 prev_fc = fwd ? &c->bck_fc : &c->fwd_fc;
3352 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3353 "connection send %s ack on %s\n",
3354 fwd ? "FWD" : "BCK", GNUNET_h2s (&c->id));
3356 /* Check if we need to transmit the ACK */
3357 if (prev_fc->last_ack_sent - prev_fc->last_pid_recv > 3)
3359 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Not sending ACK, buffer > 3\n");
3360 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3361 " last pid recv: %u, last ack sent: %u\n",
3362 prev_fc->last_pid_recv, prev_fc->last_ack_sent);
3366 /* Ok, ACK might be necessary, what PID to ACK? */
3367 delta = next_fc->queue_max - next_fc->queue_n;
3368 ack = prev_fc->last_pid_recv + delta;
3369 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ACK %u\n", ack);
3370 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3371 " last pid %u, last ack %u, qmax %u, q %u\n",
3372 prev_fc->last_pid_recv, prev_fc->last_ack_sent,
3373 next_fc->queue_max, next_fc->queue_n);
3374 if (ack == prev_fc->last_ack_sent)
3376 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Not sending FWD ACK, not needed\n");
3380 prev_fc->last_ack_sent = ack;
3382 /* Build ACK message and send on connection */
3383 msg.header.size = htons (sizeof (msg));
3384 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_ACK);
3385 msg.ack = htonl (ack);
3388 send_prebuilt_message_connection (&msg.header, c, NULL, !fwd);
3393 * Modify the mesh message TID from global to local and send to client.
3395 * @param ch Channel on which to send the message.
3396 * @param msg Message to modify and send.
3397 * @param c Client to send to.
3398 * @param tid Tunnel ID to use (c can be both owner and client).
3401 channel_send_client_to_tid (struct MeshChannel *ch,
3402 const struct GNUNET_MESH_Data *msg,
3403 struct MeshClient *c, MESH_ChannelNumber id)
3405 struct GNUNET_MESH_LocalData *copy;
3406 uint16_t size = ntohs (msg->header.size) - sizeof (struct GNUNET_MESH_Data);
3407 char cbuf[size + sizeof (struct GNUNET_MESH_LocalData)];
3409 if (size < sizeof (struct GNUNET_MessageHeader))
3411 GNUNET_break_op (0);
3419 copy = (struct GNUNET_MESH_LocalData *) cbuf;
3420 memcpy (©[1], &msg[1], size);
3421 copy->header.size = htons (sizeof (struct GNUNET_MESH_LocalData) + size);
3422 copy->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_DATA);
3423 copy->id = htonl (id);
3424 GNUNET_SERVER_notification_context_unicast (nc, c->handle,
3425 ©->header, GNUNET_NO);
3430 * We have received a message out of order, or the client is not ready.
3431 * Buffer it until we receive an ACK from the client or the missing
3432 * message from the channel.
3434 * @param msg Message to buffer (MUST be of type MESH_DATA).
3435 * @param rel Reliability data to the corresponding direction.
3438 channel_rel_add_buffered_data (const struct GNUNET_MESH_Data *msg,
3439 struct MeshChannelReliability *rel)
3441 struct MeshReliableMessage *copy;
3442 struct MeshReliableMessage *prev;
3446 size = ntohs (msg->header.size);
3447 mid = ntohl (msg->mid);
3449 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "add_buffered_data %u\n", mid);
3451 copy = GNUNET_malloc (sizeof (*copy) + size);
3454 memcpy (©[1], msg, size);
3458 // FIXME do something better than O(n), although n < 64...
3459 // FIXME start from the end (most messages are the latest ones)
3460 for (prev = rel->head_recv; NULL != prev; prev = prev->next)
3462 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " prev %u\n", prev->mid);
3463 if (GMC_is_pid_bigger (prev->mid, mid))
3465 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " bingo!\n");
3466 GNUNET_CONTAINER_DLL_insert_before (rel->head_recv, rel->tail_recv,
3471 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " insert at tail!\n");
3472 GNUNET_CONTAINER_DLL_insert_tail (rel->head_recv, rel->tail_recv, copy);
3473 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "add_buffered_data END\n");
3478 channel_send_client_data (struct MeshChannel *ch,
3479 const struct GNUNET_MESH_Data *msg,
3484 if (ch->dest_rel->client_ready)
3485 channel_send_client_to_tid (ch, msg, ch->dest, ch->lid_dest);
3487 channel_rel_add_buffered_data (msg, ch->dest_rel);
3491 if (ch->root_rel->client_ready)
3492 channel_send_client_to_tid (ch, msg, ch->root, ch->lid_root);
3494 channel_rel_add_buffered_data (msg, ch->root_rel);
3500 * Send a buffered message to the client, for in order delivery or
3501 * as result of client ACK.
3503 * @param ch Channel on which to empty the message buffer.
3504 * @param c Client to send to.
3505 * @param rel Reliability structure to corresponding peer.
3506 * If rel == bck_rel, this is FWD data.
3509 channel_send_client_buffered_data (struct MeshChannel *ch,
3510 struct MeshClient *c,
3513 struct MeshReliableMessage *copy;
3514 struct MeshChannelReliability *rel;
3516 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "send_buffered_data\n");
3517 rel = fwd ? ch->dest_rel : ch->root_rel;
3518 if (GNUNET_NO == rel->client_ready)
3520 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "client not ready\n");
3524 copy = rel->head_recv;
3525 /* We never buffer channel management messages */
3528 if (copy->mid == rel->mid_recv || GNUNET_NO == ch->reliable)
3530 struct GNUNET_MESH_Data *msg = (struct GNUNET_MESH_Data *) ©[1];
3532 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3533 " have %u! now expecting %u\n",
3534 copy->mid, rel->mid_recv + 1);
3535 channel_send_client_data (ch, msg, fwd);
3538 GNUNET_CONTAINER_DLL_remove (rel->head_recv, rel->tail_recv, copy);
3543 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3544 " reliable && don't have %u, next is %u\n",
3550 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "send_buffered_data END\n");
3555 * Destroy a reliable message after it has been acknowledged, either by
3556 * direct mid ACK or bitfield. Updates the appropriate data structures and
3557 * timers and frees all memory.
3559 * @param copy Message that is no longer needed: remote peer got it.
3562 rel_message_free (struct MeshReliableMessage *copy)
3564 struct MeshChannelReliability *rel;
3565 struct GNUNET_TIME_Relative time;
3568 time = GNUNET_TIME_absolute_get_duration (copy->timestamp);
3569 rel->expected_delay.rel_value_us *= 7;
3570 rel->expected_delay.rel_value_us += time.rel_value_us;
3571 rel->expected_delay.rel_value_us /= 8;
3573 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! Freeing %u\n", copy->mid);
3574 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " n_sent %u\n", rel->n_sent);
3575 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! took %s\n",
3576 GNUNET_STRINGS_relative_time_to_string (time, GNUNET_NO));
3577 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! new expected delay %s\n",
3578 GNUNET_STRINGS_relative_time_to_string (rel->expected_delay,
3580 rel->retry_timer = rel->expected_delay;
3581 GNUNET_CONTAINER_DLL_remove (rel->head_sent, rel->tail_sent, copy);
3587 * Destroy all reliable messages queued for a channel,
3588 * during a channel destruction.
3589 * Frees the reliability structure itself.
3591 * @param rel Reliability data for a channel.
3594 channel_rel_free_all (struct MeshChannelReliability *rel)
3596 struct MeshReliableMessage *copy;
3597 struct MeshReliableMessage *next;
3602 for (copy = rel->head_recv; NULL != copy; copy = next)
3605 GNUNET_CONTAINER_DLL_remove (rel->head_recv, rel->tail_recv, copy);
3608 for (copy = rel->head_sent; NULL != copy; copy = next)
3611 GNUNET_CONTAINER_DLL_remove (rel->head_sent, rel->tail_sent, copy);
3614 if (GNUNET_SCHEDULER_NO_TASK != rel->retry_task)
3615 GNUNET_SCHEDULER_cancel (rel->retry_task);
3621 * Mark future messages as ACK'd.
3623 * @param rel Reliability data.
3624 * @param msg DataACK message with a bitfield of future ACK'd messages.
3627 channel_rel_free_sent (struct MeshChannelReliability *rel,
3628 const struct GNUNET_MESH_DataACK *msg)
3630 struct MeshReliableMessage *copy;
3631 struct MeshReliableMessage *next;
3638 bitfield = msg->futures;
3639 mid = ntohl (msg->mid);
3640 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3641 "free_sent_reliable %u %llX\n",
3643 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3644 " rel %p, head %p\n",
3645 rel, rel->head_sent);
3646 for (i = 0, copy = rel->head_sent;
3647 i < 64 && NULL != copy && 0 != bitfield;
3650 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3651 " trying bit %u (mid %u)\n",
3654 if (0 == (bitfield & mask))
3657 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " set!\n");
3658 /* Bit was set, clear the bit from the bitfield */
3661 /* The i-th bit was set. Do we have that copy? */
3662 /* Skip copies with mid < target */
3663 target = mid + i + 1;
3664 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " target %u\n", target);
3665 while (NULL != copy && GMC_is_pid_bigger (target, copy->mid))
3668 /* Did we run out of copies? (previously freed, it's ok) */
3671 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "run out of copies...\n");
3675 /* Did we overshoot the target? (previously freed, it's ok) */
3676 if (GMC_is_pid_bigger (copy->mid, target))
3678 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " next copy %u\n", copy->mid);
3682 /* Now copy->mid == target, free it */
3684 rel_message_free (copy);
3687 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "free_sent_reliable END\n");
3692 * We haven't received an ACK after a certain time: restransmit the message.
3694 * @param cls Closure (MeshReliableMessage with the message to restransmit)
3695 * @param tc TaskContext.
3698 channel_retransmit_message (void *cls,
3699 const struct GNUNET_SCHEDULER_TaskContext *tc)
3701 struct MeshChannelReliability *rel = cls;
3702 struct MeshReliableMessage *copy;
3703 struct MeshPeerQueue *q;
3704 struct MeshChannel *ch;
3705 struct MeshConnection *c;
3706 struct GNUNET_MESH_Data *payload;
3707 struct MeshPeer *hop;
3710 rel->retry_task = GNUNET_SCHEDULER_NO_TASK;
3711 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
3715 copy = rel->head_sent;
3722 /* Search the message to be retransmitted in the outgoing queue.
3723 * Check only the queue for the connection that is going to be used,
3724 * if the message is stuck in some other connection's queue we shouldn't
3726 * - cancelling it and sending the new one doesn't guarantee it's delivery,
3727 * the old connection could be temporary stalled or the queue happened to
3728 * be long at time of insertion.
3729 * - not sending the new one could cause terrible delays the old connection
3732 payload = (struct GNUNET_MESH_Data *) ©[1];
3733 fwd = (rel == ch->root_rel);
3734 c = tunnel_get_connection (ch->t, fwd);
3735 hop = connection_get_hop (c, fwd);
3736 for (q = hop->queue_head; NULL != q; q = q->next)
3738 if (ntohs (payload->header.type) == q->type && ch == q->ch)
3740 struct GNUNET_MESH_Data *queued_data = q->cls;
3742 if (queued_data->mid == payload->mid)
3747 /* Message not found in the queue that we are going to use. */
3750 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! RETRANSMIT %u\n", copy->mid);
3752 send_prebuilt_message_channel (&payload->header, ch, fwd);
3753 GNUNET_STATISTICS_update (stats, "# data retransmitted", 1, GNUNET_NO);
3757 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! ALREADY IN QUEUE %u\n", copy->mid);
3760 rel->retry_timer = GNUNET_TIME_STD_BACKOFF (rel->retry_timer);
3761 rel->retry_task = GNUNET_SCHEDULER_add_delayed (rel->retry_timer,
3762 &channel_retransmit_message,
3768 * Send ACK on one or more connections due to buffer space to the client.
3770 * Iterates all connections of the tunnel and sends ACKs appropriately.
3772 * @param ch Channel which has some free buffer space.
3773 * @param fwd Is this in for FWD traffic? (ACK goes dest->root)
3776 channel_send_connections_ack (struct MeshChannel *ch,
3777 unsigned int buffer,
3780 struct MeshTunnel2 *t = ch->t;
3781 struct MeshConnection *c;
3782 struct MeshFlowControl *fc;
3785 uint32_t allow_per_connection;
3788 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3789 "Channel send connection %s ack on %s:%X\n",
3790 fwd ? "FWD" : "BCK", peer2s (ch->t->peer), ch->gid);
3792 /* Count connections, how many messages are already allowed */
3793 for (cs = 0, allowed = 0, c = t->connection_head; NULL != c; c = c->next)
3795 fc = fwd ? &c->fwd_fc : &c->bck_fc;
3796 if (GMC_is_pid_bigger(fc->last_pid_recv, fc->last_ack_sent))
3801 allowed += fc->last_ack_sent - fc->last_pid_recv;
3805 /* Make sure there is no overflow */
3806 if (allowed > buffer)
3812 /* Authorize connections to send more data */
3813 to_allow = buffer - allowed;
3815 for (c = t->connection_head; NULL != c && to_allow > 0; c = c->next)
3817 allow_per_connection = to_allow/cs;
3818 to_allow -= allow_per_connection;
3820 fc = fwd ? &c->fwd_fc : &c->bck_fc;
3821 if (fc->last_ack_sent - fc->last_pid_recv > 64 / 3)
3825 connection_send_ack (c, allow_per_connection, fwd);
3828 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3829 "Channel send connection %s ack on %s:%X\n",
3830 fwd ? "FWD" : "BCK", peer2s (ch->t->peer), ch->gid);
3831 GNUNET_break (to_allow == 0);
3836 * Send an ACK on the appropriate connection/channel, depending on
3837 * the direction and the position of the peer.
3839 * @param c Which connection to send the hop-by-hop ACK.
3840 * @param ch Channel, if any.
3841 * @param fwd Is this a fwd ACK? (will go dest->root)
3844 send_ack (struct MeshConnection *c, struct MeshChannel *ch, int fwd)
3846 unsigned int buffer;
3848 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3849 "send ack %s on %p %p\n",
3850 fwd ? "FWD" : "BCK", c, ch);
3851 if (NULL == c || connection_is_terminal (c, fwd))
3853 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " getting from Channel\n");
3854 buffer = tunnel_get_buffer (NULL == c ? ch->t : c->t, fwd);
3858 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " getting from Connection\n");
3859 GNUNET_assert (NULL != c);
3860 buffer = connection_get_buffer (c, fwd);
3862 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " buffer available: %u\n", buffer);
3866 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " sending on all connections\n");
3867 GNUNET_assert (NULL != ch);
3868 channel_send_connections_ack (ch, buffer, fwd);
3870 else if (connection_is_origin (c, fwd))
3872 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " sending on channel...\n");
3875 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " really sending!\n");
3876 GNUNET_assert (NULL != ch);
3877 send_local_ack (ch, fwd);
3882 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " sending on connection\n");
3883 connection_send_ack (c, buffer, fwd);
3889 * Channel was ACK'd by remote peer, mark as ready and cancel retransmission.
3891 * @param ch Channel to mark as ready.
3892 * @param fwd Was the CREATE message sent fwd?
3895 channel_confirm (struct MeshChannel *ch, int fwd)
3897 struct MeshChannelReliability *rel;
3898 struct MeshReliableMessage *copy;
3899 struct MeshReliableMessage *next;
3901 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3902 " channel confirm %s %s:%X\n",
3903 fwd ? "FWD" : "BCK", peer2s (ch->t->peer), ch->gid);
3904 ch->state = MESH_CHANNEL_READY;
3906 rel = fwd ? ch->root_rel : ch->dest_rel;
3907 for (copy = rel->head_sent; NULL != copy; copy = next)
3909 struct GNUNET_MessageHeader *msg;
3912 msg = (struct GNUNET_MessageHeader *) ©[1];
3913 if (ntohs (msg->type) == GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE)
3915 rel_message_free (copy);
3919 if (GNUNET_NO == rel->client_ready)
3920 send_local_ack (ch, fwd);
3925 * Save a copy to retransmit in case it gets lost.
3927 * Initializes all needed callbacks and timers.
3929 * @param ch Channel this message goes on.
3930 * @param msg Message to copy.
3931 * @param fwd Is this fwd traffic?
3934 channel_save_copy (struct MeshChannel *ch,
3935 const struct GNUNET_MessageHeader *msg,
3938 struct MeshChannelReliability *rel;
3939 struct MeshReliableMessage *copy;
3944 rel = fwd ? ch->root_rel : ch->dest_rel;
3945 mid = rel->mid_send;
3946 type = ntohs (msg->type);
3947 size = ntohs (msg->size);
3949 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! SAVE %u\n", mid);
3950 copy = GNUNET_malloc (sizeof (struct MeshReliableMessage) + size);
3952 copy->timestamp = GNUNET_TIME_absolute_get ();
3955 memcpy (©[1], msg, size);
3957 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " n_sent %u\n", rel->n_sent);
3958 GNUNET_CONTAINER_DLL_insert_tail (rel->head_sent, rel->tail_sent, copy);
3959 if (GNUNET_SCHEDULER_NO_TASK == rel->retry_task)
3962 GNUNET_TIME_relative_multiply (rel->expected_delay,
3963 MESH_RETRANSMIT_MARGIN);
3965 GNUNET_SCHEDULER_add_delayed (rel->retry_timer,
3966 &channel_retransmit_message,
3973 * Send keepalive packets for a connection.
3975 * @param c Connection to keep alive..
3976 * @param fwd Is this a FWD keepalive? (owner -> dest).
3979 connection_keepalive (struct MeshConnection *c, int fwd)
3981 struct GNUNET_MESH_ConnectionKeepAlive *msg;
3982 size_t size = sizeof (struct GNUNET_MESH_ConnectionKeepAlive);
3986 type = fwd ? GNUNET_MESSAGE_TYPE_MESH_FWD_KEEPALIVE :
3987 GNUNET_MESSAGE_TYPE_MESH_BCK_KEEPALIVE;
3989 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3990 "sending %s keepalive for connection %s[%d]\n",
3991 fwd ? "FWD" : "BCK",
3992 peer2s (c->t->peer),
3995 msg = (struct GNUNET_MESH_ConnectionKeepAlive *) cbuf;
3996 msg->header.size = htons (size);
3997 msg->header.type = htons (type);
4000 send_prebuilt_message_connection (&msg->header, c, NULL, fwd);
4005 * Send CONNECTION_{CREATE/ACK} packets for a connection.
4007 * @param c Connection for which to send the message.
4008 * @param fwd If GNUNET_YES, send CREATE, otherwise send ACK.
4011 connection_recreate (struct MeshConnection *c, int fwd)
4013 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "sending connection recreate\n");
4015 send_connection_create (c);
4017 send_connection_ack (c, GNUNET_NO);
4022 * Generic connection timer management.
4023 * Depending on the role of the peer in the connection will send the
4024 * appropriate message (build or keepalive)
4026 * @param c Conncetion to maintain.
4027 * @param fwd Is FWD?
4030 connection_maintain (struct MeshConnection *c, int fwd)
4032 if (MESH_TUNNEL_SEARCHING == c->t->state)
4034 /* TODO DHT GET with RO_BART */
4039 case MESH_CONNECTION_NEW:
4041 case MESH_CONNECTION_SENT:
4042 connection_recreate (c, fwd);
4044 case MESH_CONNECTION_READY:
4045 connection_keepalive (c, fwd);
4054 connection_fwd_keepalive (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
4056 struct MeshConnection *c = cls;
4058 c->fwd_maintenance_task = GNUNET_SCHEDULER_NO_TASK;
4059 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
4062 connection_maintain (c, GNUNET_YES);
4063 c->fwd_maintenance_task = GNUNET_SCHEDULER_add_delayed (refresh_connection_time,
4064 &connection_fwd_keepalive,
4070 connection_bck_keepalive (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
4072 struct MeshConnection *c = cls;
4074 c->bck_maintenance_task = GNUNET_SCHEDULER_NO_TASK;
4075 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
4078 connection_maintain (c, GNUNET_NO);
4079 c->bck_maintenance_task = GNUNET_SCHEDULER_add_delayed (refresh_connection_time,
4080 &connection_bck_keepalive,
4086 * Send a message to all peers in this connection that the connection
4087 * is no longer valid.
4089 * If some peer should not receive the message, it should be zero'ed out
4090 * before calling this function.
4092 * @param c The connection whose peers to notify.
4095 connection_send_destroy (struct MeshConnection *c)
4097 struct GNUNET_MESH_ConnectionDestroy msg;
4099 msg.header.size = htons (sizeof (msg));
4100 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY);;
4102 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4103 " sending connection destroy for connection %s[%X]\n",
4104 peer2s (c->t->peer),
4107 send_prebuilt_message_connection (&msg.header, c, NULL, GNUNET_YES);
4108 send_prebuilt_message_connection (&msg.header, c, NULL, GNUNET_NO);
4109 c->destroy = GNUNET_YES;
4114 * Confirm we got a channel create.
4116 * @param ch The channel to confirm.
4117 * @param fwd Should we send the ACK fwd?
4120 channel_send_ack (struct MeshChannel *ch, int fwd)
4122 struct GNUNET_MESH_ChannelManage msg;
4124 msg.header.size = htons (sizeof (msg));
4125 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CHANNEL_ACK);
4126 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4127 " sending channel ack for channel %s:%X\n",
4128 peer2s (ch->t->peer),
4131 msg.chid = htonl (ch->gid);
4132 send_prebuilt_message_channel (&msg.header, ch, fwd);
4137 * Send a message to all clients (local and remote) of this channel
4138 * notifying that the channel is no longer valid.
4140 * If some peer or client should not receive the message,
4141 * should be zero'ed out before calling this function.
4143 * @param ch The channel whose clients to notify.
4146 channel_send_destroy (struct MeshChannel *ch)
4148 struct GNUNET_MESH_ChannelManage msg;
4150 msg.header.size = htons (sizeof (msg));
4151 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY);
4152 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4153 " sending channel destroy for channel %s:%X\n",
4154 peer2s (ch->t->peer),
4157 if (channel_is_terminal (ch, GNUNET_NO))
4159 if (NULL != ch->root)
4161 msg.chid = htonl (ch->lid_root);
4162 send_local_channel_destroy (ch, GNUNET_NO);
4167 msg.chid = htonl (ch->gid);
4168 send_prebuilt_message_channel (&msg.header, ch, GNUNET_NO);
4171 if (channel_is_terminal (ch, GNUNET_YES))
4173 if (NULL != ch->dest)
4175 msg.chid = htonl (ch->lid_dest);
4176 send_local_channel_destroy (ch, GNUNET_YES);
4181 msg.chid = htonl (ch->gid);
4182 send_prebuilt_message_channel (&msg.header, ch, GNUNET_YES);
4190 static struct MeshTunnel2 *
4193 struct MeshTunnel2 *t;
4195 t = GNUNET_new (struct MeshTunnel2);
4197 t->next_local_chid = GNUNET_MESH_LOCAL_CHANNEL_ID_SERV;
4199 // GNUNET_CONTAINER_multihashmap_put (tunnels, tid, t,
4200 // GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST))
4202 // GNUNET_break (0);
4203 // tunnel_destroy (t);
4207 // char salt[] = "salt";
4208 // GNUNET_CRYPTO_kdf (&t->e_key, sizeof (struct GNUNET_CRYPTO_AesSessionKey),
4209 // salt, sizeof (salt),
4210 // &t->e_key, sizeof (struct GNUNET_CRYPTO_AesSessionKey),
4211 // &my_full_id, sizeof (struct GNUNET_PeerIdentity),
4212 // GNUNET_PEER_resolve2 (t->peer->id), sizeof (struct GNUNET_PeerIdentity),
4214 // GNUNET_CRYPTO_kdf (&t->d_key, sizeof (struct GNUNET_CRYPTO_AesSessionKey),
4215 // salt, sizeof (salt),
4216 // &t->d_key, sizeof (struct GNUNET_CRYPTO_AesSessionKey),
4217 // GNUNET_PEER_resolve2 (t->peer->id), sizeof (struct GNUNET_PeerIdentity),
4218 // &my_full_id, sizeof (struct GNUNET_PeerIdentity),
4226 * Add a connection to a tunnel.
4229 * @param c Connection.
4232 tunnel_add_connection (struct MeshTunnel2 *t, struct MeshConnection *c)
4235 GNUNET_CONTAINER_DLL_insert_tail (t->connection_head, t->connection_tail, c);
4240 * Initialize a Flow Control structure to the initial state.
4242 * @param fc Flow Control structure to initialize.
4245 fc_init (struct MeshFlowControl *fc)
4248 fc->last_pid_sent = (uint32_t) -1; /* Next (expected) = 0 */
4249 fc->last_pid_recv = (uint32_t) -1;
4250 fc->last_ack_sent = (uint32_t) 0;
4251 fc->last_ack_recv = (uint32_t) 0;
4252 fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
4253 fc->poll_time = GNUNET_TIME_UNIT_SECONDS;
4255 fc->queue_max = (max_msgs_queue / max_connections) + 1;
4259 static struct MeshConnection *
4260 connection_new (const struct GNUNET_HashCode *cid)
4262 struct MeshConnection *c;
4264 c = GNUNET_new (struct MeshConnection);
4266 GNUNET_CONTAINER_multihashmap_put (connections, &c->id, c,
4267 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST);
4268 fc_init (&c->fwd_fc);
4269 fc_init (&c->bck_fc);
4278 * Find a connection.
4280 * @param cid Connection ID.
4282 static struct MeshConnection *
4283 connection_get (const struct GNUNET_HashCode *cid)
4285 return GNUNET_CONTAINER_multihashmap_get (connections, cid);
4290 connection_destroy (struct MeshConnection *c)
4292 struct MeshPeer *peer;
4297 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "destroying connection %s[%X]\n",
4298 peer2s (c->t->peer),
4301 /* Cancel all traffic */
4302 connection_cancel_queues (c, GNUNET_YES);
4303 connection_cancel_queues (c, GNUNET_NO);
4305 /* Cancel maintainance task (keepalive/timeout) */
4306 if (GNUNET_SCHEDULER_NO_TASK != c->fwd_maintenance_task)
4307 GNUNET_SCHEDULER_cancel (c->fwd_maintenance_task);
4308 if (GNUNET_SCHEDULER_NO_TASK != c->bck_maintenance_task)
4309 GNUNET_SCHEDULER_cancel (c->bck_maintenance_task);
4311 /* Deregister from neighbors */
4312 peer = connection_get_next_hop (c);
4314 GNUNET_CONTAINER_multihashmap_remove (peer->connections, &c->id, c);
4315 peer = connection_get_prev_hop (c);
4317 GNUNET_CONTAINER_multihashmap_remove (peer->connections, &c->id, c);
4320 GNUNET_STATISTICS_update (stats, "# connections", -1, GNUNET_NO);
4321 GNUNET_CONTAINER_DLL_remove (c->t->connection_head, c->t->connection_tail, c);
4327 tunnel_destroy (struct MeshTunnel2 *t)
4329 struct MeshConnection *c;
4330 struct MeshConnection *next;
4335 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "destroying tunnel %s\n",
4338 // if (GNUNET_YES != GNUNET_CONTAINER_multihashmap_remove (tunnels, &t->id, t))
4339 // GNUNET_break (0);
4341 for (c = t->connection_head; NULL != c; c = next)
4344 connection_destroy (c);
4347 GNUNET_STATISTICS_update (stats, "# tunnels", -1, GNUNET_NO);
4354 * Tunnel is empty: destroy it.
4356 * Notifies all connections about the destruction.
4358 * @param t Tunnel to destroy.
4361 tunnel_destroy_empty (struct MeshTunnel2 *t)
4363 struct MeshConnection *c;
4365 for (c = t->connection_head; NULL != c; c = c->next)
4367 if (GNUNET_NO == c->destroy)
4368 connection_send_destroy (c);
4371 if (0 == t->pending_messages)
4374 t->destroy = GNUNET_YES;
4379 * Destroy tunnel if empty (no more channels).
4381 * @param t Tunnel to destroy if empty.
4384 tunnel_destroy_if_empty (struct MeshTunnel2 *t)
4386 if (NULL != t->channel_head)
4389 tunnel_destroy_empty (t);
4394 * Destroy a channel and free all resources.
4396 * @param ch Channel to destroy.
4399 channel_destroy (struct MeshChannel *ch)
4401 struct MeshClient *c;
4409 if (GNUNET_YES != GNUNET_CONTAINER_multihashmap32_remove (c->own_channels,
4420 GNUNET_CONTAINER_multihashmap32_remove (c->incoming_channels,
4427 channel_rel_free_all (ch->root_rel);
4428 channel_rel_free_all (ch->dest_rel);
4430 GNUNET_CONTAINER_DLL_remove (ch->t->channel_head, ch->t->channel_tail, ch);
4431 GNUNET_STATISTICS_update (stats, "# channels", -1, GNUNET_NO);
4437 * Create a new channel.
4439 * @param t Tunnel this channel is in.
4440 * @param owner Client that owns the channel, NULL for foreign channels.
4441 * @param lid_root Local ID for root client.
4443 * @return A new initialized channel. NULL on error.
4445 static struct MeshChannel *
4446 channel_new (struct MeshTunnel2 *t,
4447 struct MeshClient *owner, MESH_ChannelNumber lid_root)
4449 struct MeshChannel *ch;
4451 ch = GNUNET_new (struct MeshChannel);
4453 ch->lid_root = lid_root;
4456 GNUNET_CONTAINER_DLL_insert (t->channel_head, t->channel_tail, ch);
4458 GNUNET_STATISTICS_update (stats, "# channels", 1, GNUNET_NO);
4462 while (NULL != channel_get (t, t->next_chid))
4463 t->next_chid = (t->next_chid + 1) & ~GNUNET_MESH_LOCAL_CHANNEL_ID_CLI;
4464 ch->gid = t->next_chid;
4465 t->next_chid = (t->next_chid + 1) & ~GNUNET_MESH_LOCAL_CHANNEL_ID_CLI;
4468 GNUNET_CONTAINER_multihashmap32_put (owner->own_channels, lid_root, ch,
4469 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
4472 channel_destroy (ch);
4473 GNUNET_SERVER_receive_done (owner->handle, GNUNET_SYSERR);
4483 * Set options in a channel, extracted from a bit flag field
4485 * @param ch Channel to set options to.
4486 * @param options Bit array in host byte order.
4489 channel_set_options (struct MeshChannel *ch, uint32_t options)
4491 ch->nobuffer = (options & GNUNET_MESH_OPTION_NOBUFFER) != 0 ?
4492 GNUNET_YES : GNUNET_NO;
4493 ch->reliable = (options & GNUNET_MESH_OPTION_RELIABLE) != 0 ?
4494 GNUNET_YES : GNUNET_NO;
4499 * Iterator for deleting each channel whose client endpoint disconnected.
4501 * @param cls Closure (client that has disconnected).
4502 * @param key The local channel id (used to access the hashmap).
4503 * @param value The value stored at the key (channel to destroy).
4505 * @return GNUNET_OK, keep iterating.
4508 channel_destroy_iterator (void *cls,
4512 struct MeshChannel *ch = value;
4513 struct MeshClient *c = cls;
4514 struct MeshTunnel2 *t;
4516 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4517 " Channel %X (%X / %X) destroy, due to client %u shutdown.\n",
4518 ch->gid, ch->lid_root, ch->lid_dest, c->id);
4522 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Client %u is destination.\n", c->id);
4527 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Client %u is owner.\n", c->id);
4532 channel_send_destroy (ch);
4533 channel_destroy (ch);
4534 tunnel_destroy_if_empty (t);
4541 * Remove client's ports from the global hashmap on disconnect.
4543 * @param cls Closure (unused).
4545 * @param value Client structure.
4547 * @return GNUNET_OK, keep iterating.
4550 client_release_ports (void *cls,
4556 res = GNUNET_CONTAINER_multihashmap32_remove (ports, key, value);
4557 if (GNUNET_YES != res)
4560 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
4561 "Port %u by client %p was not registered.\n",
4569 * Timeout function due to lack of keepalive/traffic from the owner.
4570 * Destroys connection if called.
4572 * @param cls Closure (connection to destroy).
4573 * @param tc TaskContext.
4576 connection_fwd_timeout (void *cls,
4577 const struct GNUNET_SCHEDULER_TaskContext *tc)
4579 struct MeshConnection *c = cls;
4581 c->fwd_maintenance_task = GNUNET_SCHEDULER_NO_TASK;
4582 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
4584 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4585 "Connection %s[%X] FWD timed out. Destroying.\n",
4586 peer2s (c->t->peer),
4589 if (connection_is_origin (c, GNUNET_YES)) /* If local, leave. */
4592 connection_destroy (c);
4597 * Timeout function due to lack of keepalive/traffic from the destination.
4598 * Destroys connection if called.
4600 * @param cls Closure (connection to destroy).
4601 * @param tc TaskContext
4604 connection_bck_timeout (void *cls,
4605 const struct GNUNET_SCHEDULER_TaskContext *tc)
4607 struct MeshConnection *c = cls;
4609 c->bck_maintenance_task = GNUNET_SCHEDULER_NO_TASK;
4610 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
4613 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4614 "Connection %s[%X] FWD timed out. Destroying.\n",
4615 peer2s (c->t->peer),
4618 if (connection_is_origin (c, GNUNET_NO)) /* If local, leave. */
4621 connection_destroy (c);
4626 * Resets the connection timeout task, some other message has done the
4628 * - For the first peer on the direction this means to send
4629 * a keepalive or a path confirmation message (either create or ACK).
4630 * - For all other peers, this means to destroy the connection,
4631 * due to lack of activity.
4632 * Starts the tiemout if no timeout was running (connection just created).
4634 * @param c Connection whose timeout to reset.
4635 * @param fwd Is this forward?
4637 * TODO use heap to improve efficiency of scheduler.
4640 connection_reset_timeout (struct MeshConnection *c, int fwd)
4642 GNUNET_SCHEDULER_TaskIdentifier *ti;
4643 GNUNET_SCHEDULER_Task f;
4645 ti = fwd ? &c->fwd_maintenance_task : &c->bck_maintenance_task;
4647 if (GNUNET_SCHEDULER_NO_TASK != *ti)
4648 GNUNET_SCHEDULER_cancel (*ti);
4650 if (connection_is_origin (c, fwd)) /* Endpoint */
4652 f = fwd ? &connection_fwd_keepalive : &connection_bck_keepalive;
4653 *ti = GNUNET_SCHEDULER_add_delayed (refresh_connection_time, f, c);
4657 struct GNUNET_TIME_Relative delay;
4659 delay = GNUNET_TIME_relative_multiply (refresh_connection_time, 4);
4660 f = fwd ? &connection_fwd_timeout : &connection_bck_timeout;
4661 *ti = GNUNET_SCHEDULER_add_delayed (delay, f, c);
4667 * Iterator to notify all connections of a broken link. Mark connections
4668 * to destroy after all traffic has been sent.
4670 * @param cls Closure (peer disconnected).
4671 * @param key Current key code (tid).
4672 * @param value Value in the hash map (connection).
4674 * @return GNUNET_YES if we should continue to iterate,
4678 connection_broken (void *cls,
4679 const struct GNUNET_HashCode *key,
4682 struct MeshPeer *peer = cls;
4683 struct MeshConnection *c = value;
4684 struct GNUNET_MESH_ConnectionBroken msg;
4687 fwd = peer == connection_get_prev_hop (c);
4688 connection_cancel_queues (c, !fwd);
4690 msg.header.size = htons (sizeof (struct GNUNET_MESH_ConnectionBroken));
4691 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CONNECTION_BROKEN);
4693 msg.peer1 = my_full_id;
4694 msg.peer2 = *GNUNET_PEER_resolve2 (peer->id);
4695 send_prebuilt_message_connection (&msg.header, c, NULL, fwd);
4696 c->destroy = GNUNET_YES;
4701 /******************************************************************************/
4702 /**************** MESH NETWORK HANDLER HELPERS ***********************/
4703 /******************************************************************************/
4706 * Free a transmission that was already queued with all resources
4707 * associated to the request.
4709 * @param queue Queue handler to cancel.
4710 * @param clear_cls Is it necessary to free associated cls?
4713 queue_destroy (struct MeshPeerQueue *queue, int clear_cls)
4715 struct MeshPeer *peer;
4716 struct MeshFlowControl *fc;
4721 GNUNET_assert (NULL != queue->c);
4722 fc = fwd ? &queue->c->fwd_fc : &queue->c->bck_fc;
4724 if (GNUNET_YES == clear_cls)
4726 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " queue destroy type %s\n",
4727 GNUNET_MESH_DEBUG_M2S (queue->type));
4728 switch (queue->type)
4730 case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_DESTROY:
4731 case GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY:
4732 GNUNET_log (GNUNET_ERROR_TYPE_INFO, "destroying a DESTROY message\n");
4733 GNUNET_break (GNUNET_YES == queue->c->destroy);
4735 case GNUNET_MESSAGE_TYPE_MESH_FWD:
4736 case GNUNET_MESSAGE_TYPE_MESH_BCK:
4737 case GNUNET_MESSAGE_TYPE_MESH_ACK:
4738 case GNUNET_MESSAGE_TYPE_MESH_POLL:
4739 case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_ACK:
4740 case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_CREATE:
4741 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " prebuilt message\n");;
4742 GNUNET_free_non_null (queue->cls);
4747 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, " type %s unknown!\n",
4748 GNUNET_MESH_DEBUG_M2S (queue->type));
4752 GNUNET_CONTAINER_DLL_remove (peer->queue_head, peer->queue_tail, queue);
4754 if (queue->type != GNUNET_MESSAGE_TYPE_MESH_ACK &&
4755 queue->type != GNUNET_MESSAGE_TYPE_MESH_POLL)
4757 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Q_N- %p %u, \n", fc, fc->queue_n);
4761 if (NULL != queue->c)
4763 queue->c->pending_messages--;
4764 if (NULL != queue->c->t)
4766 queue->c->t->pending_messages--;
4770 GNUNET_free (queue);
4775 queue_send (void *cls, size_t size, void *buf)
4777 struct MeshPeer *peer = cls;
4778 struct MeshFlowControl *fc;
4779 struct MeshConnection *c;
4780 struct GNUNET_MessageHeader *msg;
4781 struct MeshPeerQueue *queue;
4782 struct MeshTunnel2 *t;
4783 struct MeshChannel *ch;
4784 const struct GNUNET_PeerIdentity *dst_id;
4790 peer->core_transmit = NULL;
4791 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* Queue send (max %u)\n", size);
4793 if (NULL == buf || 0 == size)
4795 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* Buffer size 0.\n");
4800 queue = peer_get_first_message (peer);
4803 GNUNET_break (0); /* Core tmt_rdy should've been canceled */
4808 fc = fwd ? &c->fwd_fc : &c->bck_fc;
4811 dst_id = GNUNET_PEER_resolve2 (peer->id);
4812 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* towards %s\n", GNUNET_i2s (dst_id));
4813 /* Check if buffer size is enough for the message */
4814 if (queue->size > size)
4816 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* not enough room, reissue\n");
4817 peer->core_transmit =
4818 GNUNET_CORE_notify_transmit_ready (core_handle,
4821 GNUNET_TIME_UNIT_FOREVER_REL,
4828 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* size %u ok\n", queue->size);
4830 t = (NULL != c) ? c->t : NULL;
4834 switch (queue->type)
4836 case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_DESTROY:
4837 case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_BROKEN:
4838 case GNUNET_MESSAGE_TYPE_MESH_FWD:
4839 case GNUNET_MESSAGE_TYPE_MESH_BCK:
4840 case GNUNET_MESSAGE_TYPE_MESH_ACK:
4841 case GNUNET_MESSAGE_TYPE_MESH_POLL:
4842 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4844 GNUNET_MESH_DEBUG_M2S (queue->type));
4845 data_size = send_core_data_raw (queue->cls, size, buf);
4846 msg = (struct GNUNET_MessageHeader *) buf;
4847 type = ntohs (msg->type);
4849 case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_CREATE:
4850 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* path create\n");
4851 if (connection_is_origin (c, GNUNET_YES))
4852 data_size = send_core_connection_create (queue->c, size, buf);
4854 data_size = send_core_data_raw (queue->cls, size, buf);
4856 case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_ACK:
4857 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* path ack\n");
4858 if (connection_is_origin (c, GNUNET_NO))
4859 data_size = send_core_connection_ack (queue->c, size, buf);
4861 data_size = send_core_data_raw (queue->cls, size, buf);
4863 case GNUNET_MESSAGE_TYPE_MESH_DATA:
4864 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE:
4865 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY:
4866 /* This should be encapsulted */
4871 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "* type unknown: %u\n",
4876 if (0 < drop_percent &&
4877 GNUNET_CRYPTO_random_u32(GNUNET_CRYPTO_QUALITY_WEAK, 101) < drop_percent)
4879 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
4880 "Dropping message of type %s\n",
4881 GNUNET_MESH_DEBUG_M2S (queue->type));
4885 /* Free queue, but cls was freed by send_core_* */
4887 queue_destroy (queue, GNUNET_NO);
4889 /* Send ACK if needed, after accounting for sent ID in fc->queue_n */
4892 case GNUNET_MESSAGE_TYPE_MESH_FWD:
4893 case GNUNET_MESSAGE_TYPE_MESH_BCK:
4894 pid = ntohl ( ((struct GNUNET_MESH_Encrypted *) buf)->pid );
4895 fc->last_pid_sent = pid;
4896 send_ack (c, ch, fwd);
4902 /* If more data in queue, send next */
4903 queue = peer_get_first_message (peer);
4906 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* more data!\n");
4907 if (NULL == peer->core_transmit) {
4908 peer->core_transmit =
4909 GNUNET_CORE_notify_transmit_ready(core_handle,
4912 GNUNET_TIME_UNIT_FOREVER_REL,
4920 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4921 "* tmt rdy called somewhere else\n");
4923 if (GNUNET_SCHEDULER_NO_TASK == fc->poll_task)
4925 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* starting poll timeout\n");
4927 GNUNET_SCHEDULER_add_delayed (fc->poll_time, &connection_poll, fc);
4932 if (GNUNET_SCHEDULER_NO_TASK != fc->poll_task)
4934 GNUNET_SCHEDULER_cancel (fc->poll_task);
4935 fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
4940 c->pending_messages--;
4941 if (GNUNET_YES == c->destroy && 0 == c->pending_messages)
4943 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* destroying connection!\n");
4944 connection_destroy (c);
4950 t->pending_messages--;
4951 if (GNUNET_YES == t->destroy && 0 == t->pending_messages)
4953 // GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* destroying tunnel!\n");
4957 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* Return %d\n", data_size);
4963 queue_add (void *cls, uint16_t type, size_t size,
4964 struct MeshConnection *c,
4965 struct MeshChannel *ch,
4968 struct MeshPeerQueue *queue;
4969 struct MeshFlowControl *fc;
4970 struct MeshPeer *peer;
4973 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4974 "queue add %s %s (%u) on c %p, ch %p\n",
4975 fwd ? "FWD" : "BCK", GNUNET_MESH_DEBUG_M2S (type), size, c, ch);
4976 GNUNET_assert (NULL != c);
4978 fc = fwd ? &c->fwd_fc : &c->bck_fc;
4979 peer = fwd ? connection_get_next_hop (c) : connection_get_prev_hop (c);
4989 if (GNUNET_MESSAGE_TYPE_MESH_POLL == type ||
4990 GNUNET_MESSAGE_TYPE_MESH_ACK == type)
4995 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "priority %d\n", priority);
4996 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "fc %p\n", fc);
4997 if (fc->queue_n >= fc->queue_max && 0 == priority)
4999 GNUNET_STATISTICS_update (stats, "# messages dropped (buffer full)",
5002 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5003 "queue full: %u/%u\n",
5004 fc->queue_n, fc->queue_max);
5005 return; /* Drop this message */
5008 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "last pid %u\n", fc->last_pid_sent);
5009 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ack %u\n", fc->last_ack_recv);
5010 if (GMC_is_pid_bigger (fc->last_pid_sent + 1, fc->last_ack_recv) &&
5011 GNUNET_SCHEDULER_NO_TASK == fc->poll_task &&
5012 GNUNET_MESSAGE_TYPE_MESH_POLL != type)
5014 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5015 "no buffer space (%u > %u): starting poll\n",
5016 fc->last_pid_sent + 1, fc->last_ack_recv);
5017 fc->poll_task = GNUNET_SCHEDULER_add_delayed (fc->poll_time,
5021 queue = GNUNET_malloc (sizeof (struct MeshPeerQueue));
5029 if (100 <= priority)
5031 GNUNET_CONTAINER_DLL_insert (peer->queue_head, peer->queue_tail, queue);
5035 GNUNET_CONTAINER_DLL_insert_tail (peer->queue_head, peer->queue_tail, queue);
5036 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Q_N+ %p %u, \n", fc, fc->queue_n);
5041 if (NULL == peer->core_transmit)
5043 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5044 "calling core tmt rdy towards %s for %u bytes\n",
5045 peer2s (peer), size);
5046 peer->core_transmit =
5047 GNUNET_CORE_notify_transmit_ready (core_handle,
5050 GNUNET_TIME_UNIT_FOREVER_REL,
5051 GNUNET_PEER_resolve2 (peer->id),
5058 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5059 "core tmt rdy towards %s already called\n",
5063 c->pending_messages++;
5064 c->t->pending_messages++;
5068 /******************************************************************************/
5069 /******************** MESH NETWORK HANDLERS **************************/
5070 /******************************************************************************/
5074 * Generic handler for mesh network payload traffic.
5076 * @param t Tunnel on which we got this message.
5077 * @param message Unencryted data message.
5078 * @param fwd Is this FWD traffic? GNUNET_YES : GNUNET_NO;
5081 handle_data (struct MeshTunnel2 *t, const struct GNUNET_MESH_Data *msg, int fwd)
5083 struct MeshChannelReliability *rel;
5084 struct MeshChannel *ch;
5085 struct MeshClient *c;
5091 size = ntohs (msg->header.size);
5093 sizeof (struct GNUNET_MESH_Data) +
5094 sizeof (struct GNUNET_MessageHeader))
5099 type = ntohs (msg->header.type);
5100 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "got a %s message\n",
5101 GNUNET_MESH_DEBUG_M2S (type));
5102 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " payload of type %s\n",
5103 GNUNET_MESH_DEBUG_M2S (ntohs (msg[1].header.type)));
5106 ch = channel_get (t, ntohl (msg->chid));
5109 GNUNET_STATISTICS_update (stats, "# data on unknown channel", 1, GNUNET_NO);
5110 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "WARNING channel unknown\n");
5114 /* Initialize FWD/BCK data */
5115 c = fwd ? ch->dest : ch->root;
5116 rel = fwd ? ch->dest_rel : ch->root_rel;
5124 tunnel_change_state (t, MESH_TUNNEL_READY);
5126 GNUNET_STATISTICS_update (stats, "# data received", 1, GNUNET_NO);
5128 mid = ntohl (msg->mid);
5129 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " mid %u\n", mid);
5131 if (GNUNET_NO == ch->reliable ||
5132 ( !GMC_is_pid_bigger (rel->mid_recv, mid) &&
5133 GMC_is_pid_bigger (rel->mid_recv + 64, mid) ) )
5135 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! RECV %u\n", mid);
5136 if (GNUNET_YES == ch->reliable)
5138 /* Is this the exact next expected messasge? */
5139 if (mid == rel->mid_recv)
5141 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "as expected\n");
5143 channel_send_client_data (ch, msg, fwd);
5147 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "save for later\n");
5148 channel_rel_add_buffered_data (msg, rel);
5153 /* Tunnel is unreliable: send to clients directly */
5154 /* FIXME: accept Out Of Order traffic */
5155 rel->mid_recv = mid + 1;
5156 channel_send_client_data (ch, msg, fwd);
5161 GNUNET_break_op (0);
5162 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5163 " MID %u not expected (%u - %u), dropping!\n",
5164 mid, rel->mid_recv, rel->mid_recv + 64);
5167 channel_send_data_ack (ch, fwd);
5171 * Handler for mesh network traffic end-to-end ACKs.
5173 * @param t Tunnel on which we got this message.
5174 * @param message Data message.
5175 * @param fwd Is this a fwd ACK? (dest->orig)
5178 handle_data_ack (struct MeshTunnel2 *t,
5179 const struct GNUNET_MESH_DataACK *msg, int fwd)
5181 struct MeshChannelReliability *rel;
5182 struct MeshReliableMessage *copy;
5183 struct MeshReliableMessage *next;
5184 struct MeshChannel *ch;
5189 type = ntohs (msg->header.type);
5190 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got a %s message!\n",
5191 GNUNET_MESH_DEBUG_M2S (type));
5192 ch = channel_get (t, ntohl (msg->chid));
5195 GNUNET_STATISTICS_update (stats, "# ack on unknown channel", 1, GNUNET_NO);
5198 ack = ntohl (msg->mid);
5199 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! %s ACK %u\n",
5200 (GNUNET_YES == fwd) ? "FWD" : "BCK", ack);
5202 if (GNUNET_YES == fwd)
5216 for (work = GNUNET_NO, copy = rel->head_sent; copy != NULL; copy = next)
5218 if (GMC_is_pid_bigger (copy->mid, ack))
5220 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! head %u, out!\n", copy->mid);
5221 channel_rel_free_sent (rel, msg);
5225 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! id %u\n", copy->mid);
5227 rel_message_free (copy);
5229 /* ACK client if needed */
5230 // channel_send_ack (t, type, GNUNET_MESSAGE_TYPE_MESH_UNICAST_ACK == type);
5232 /* If some message was free'd, update the retransmission delay*/
5233 if (GNUNET_YES == work)
5235 if (GNUNET_SCHEDULER_NO_TASK != rel->retry_task)
5237 GNUNET_SCHEDULER_cancel (rel->retry_task);
5238 if (NULL == rel->head_sent)
5240 rel->retry_task = GNUNET_SCHEDULER_NO_TASK;
5244 struct GNUNET_TIME_Absolute new_target;
5245 struct GNUNET_TIME_Relative delay;
5247 delay = GNUNET_TIME_relative_multiply (rel->retry_timer,
5248 MESH_RETRANSMIT_MARGIN);
5249 new_target = GNUNET_TIME_absolute_add (rel->head_sent->timestamp,
5251 delay = GNUNET_TIME_absolute_get_remaining (new_target);
5253 GNUNET_SCHEDULER_add_delayed (delay,
5254 &channel_retransmit_message,
5265 * Core handler for connection creation.
5267 * @param cls Closure (unused).
5268 * @param peer Sender (neighbor).
5269 * @param message Message.
5271 * @return GNUNET_OK to keep the connection open,
5272 * GNUNET_SYSERR to close it (signal serious error)
5275 handle_mesh_connection_create (void *cls,
5276 const struct GNUNET_PeerIdentity *peer,
5277 const struct GNUNET_MessageHeader *message)
5279 struct GNUNET_MESH_ConnectionCreate *msg;
5280 struct GNUNET_PeerIdentity *id;
5281 struct GNUNET_HashCode *cid;
5282 struct MeshPeerPath *path;
5283 struct MeshPeer *dest_peer;
5284 struct MeshPeer *orig_peer;
5285 struct MeshConnection *c;
5286 unsigned int own_pos;
5290 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "\n\n");
5291 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received a connection create msg\n");
5294 size = ntohs (message->size);
5295 if (size < sizeof (struct GNUNET_MESH_ConnectionCreate))
5297 GNUNET_break_op (0);
5301 /* Calculate hops */
5302 size -= sizeof (struct GNUNET_MESH_ConnectionCreate);
5303 if (size % sizeof (struct GNUNET_PeerIdentity))
5305 GNUNET_break_op (0);
5308 size /= sizeof (struct GNUNET_PeerIdentity);
5311 GNUNET_break_op (0);
5314 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " path has %u hops.\n", size);
5316 /* Get parameters */
5317 msg = (struct GNUNET_MESH_ConnectionCreate *) message;
5319 id = (struct GNUNET_PeerIdentity *) &msg[1];
5320 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5321 " connection %s (%s).\n",
5322 GNUNET_h2s (cid), GNUNET_i2s (id));
5324 /* Create connection */
5325 c = connection_get (cid);
5328 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Creating connection\n");
5329 c = connection_new (cid);
5333 connection_reset_timeout (c, GNUNET_YES);
5334 tunnel_change_state (c->t, MESH_TUNNEL_WAITING);
5336 /* Remember peers */
5337 dest_peer = peer_get (&id[size - 1]);
5338 orig_peer = peer_get (&id[0]);
5341 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Creating path...\n");
5342 path = path_new (size);
5344 for (i = 0; i < size; i++)
5346 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ... adding %s\n",
5347 GNUNET_i2s (&id[i]));
5348 path->peers[i] = GNUNET_PEER_intern (&id[i]);
5349 if (path->peers[i] == myid)
5352 if (own_pos == 0 && path->peers[own_pos] != myid)
5354 /* create path: self not found in path through self */
5355 GNUNET_break_op (0);
5356 path_destroy (path);
5357 connection_destroy (c);
5360 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Own position: %u\n", own_pos);
5361 path_add_to_peers (path, GNUNET_NO);
5362 c->path = path_duplicate (path);
5363 c->own_pos = own_pos;
5365 /* Is it a connection to us? */
5366 if (own_pos == size - 1)
5368 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " It's for us!\n");
5369 peer_add_path_to_origin (orig_peer, path, GNUNET_YES);
5371 if (NULL == orig_peer->tunnel)
5372 orig_peer->tunnel = tunnel_new ();
5373 tunnel_add_connection (orig_peer->tunnel, c);
5375 send_connection_ack (c, GNUNET_NO);
5377 /* Keep tunnel alive in direction dest->owner*/
5378 connection_reset_timeout (c, GNUNET_NO);
5382 /* It's for somebody else! Retransmit. */
5383 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Retransmitting.\n");
5384 peer_add_path (dest_peer, path_duplicate (path), GNUNET_NO);
5385 peer_add_path_to_origin (orig_peer, path, GNUNET_NO);
5386 send_prebuilt_message_connection (message, c, NULL, GNUNET_YES);
5393 * Core handler for path ACKs
5395 * @param cls closure
5396 * @param message message
5397 * @param peer peer identity this notification is about
5399 * @return GNUNET_OK to keep the connection open,
5400 * GNUNET_SYSERR to close it (signal serious error)
5403 handle_mesh_connection_ack (void *cls, const struct GNUNET_PeerIdentity *peer,
5404 const struct GNUNET_MessageHeader *message)
5406 struct GNUNET_MESH_ConnectionACK *msg;
5407 struct MeshPeerPath *p;
5408 struct MeshConnection *c;
5410 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "\n\n");
5411 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received a connection ACK msg\n");
5412 msg = (struct GNUNET_MESH_ConnectionACK *) message;
5413 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " on connection %s\n",
5414 GNUNET_h2s (&msg->cid));
5415 c = connection_get (&msg->cid);
5418 GNUNET_STATISTICS_update (stats, "# control on unknown connection",
5420 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " don't know the connection!\n");
5424 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " via peer %s\n",
5427 /* Add path to peers? */
5431 path_add_to_peers (p, GNUNET_YES);
5437 connection_change_state (c, MESH_CONNECTION_READY);
5438 connection_reset_timeout (c, GNUNET_NO);
5439 if (MESH_TUNNEL_READY != c->t->state)
5440 tunnel_change_state (c->t, MESH_TUNNEL_READY);
5441 tunnel_send_queued_data (c->t, GNUNET_YES);
5443 /* Message for us? */
5444 if (connection_is_terminal (c, GNUNET_NO))
5446 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Connection ACK for us!\n");
5447 if (3 <= tunnel_count_connections (c->t) && NULL != c->t->peer->dhtget)
5449 GNUNET_DHT_get_stop (c->t->peer->dhtget);
5450 c->t->peer->dhtget = NULL;
5452 //connection_send_ack (c, GNUNET_NO); /* FIXME */
5456 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " not for us, retransmitting...\n");
5457 send_prebuilt_message_connection (message, c, NULL, GNUNET_NO);
5463 * Core handler for notifications of broken paths
5465 * @param cls Closure (unused).
5466 * @param peer Peer identity of sending neighbor.
5467 * @param message Message.
5469 * @return GNUNET_OK to keep the connection open,
5470 * GNUNET_SYSERR to close it (signal serious error)
5473 handle_mesh_connection_broken (void *cls, const struct GNUNET_PeerIdentity *peer,
5474 const struct GNUNET_MessageHeader *message)
5476 struct GNUNET_MESH_ConnectionBroken *msg;
5477 struct MeshConnection *c;
5479 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5480 "Received a CONNECTION BROKEN msg from %s\n", GNUNET_i2s (peer));
5481 msg = (struct GNUNET_MESH_ConnectionBroken *) message;
5482 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " regarding %s\n",
5483 GNUNET_i2s (&msg->peer1));
5484 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " regarding %s\n",
5485 GNUNET_i2s (&msg->peer2));
5486 c = connection_get (&msg->cid);
5489 GNUNET_break_op (0);
5492 tunnel_notify_connection_broken (c->t, GNUNET_PEER_search (&msg->peer1),
5493 GNUNET_PEER_search (&msg->peer2));
5500 * Core handler for tunnel destruction
5502 * @param cls Closure (unused).
5503 * @param peer Peer identity of sending neighbor.
5504 * @param message Message.
5506 * @return GNUNET_OK to keep the connection open,
5507 * GNUNET_SYSERR to close it (signal serious error)
5510 handle_mesh_connection_destroy (void *cls,
5511 const struct GNUNET_PeerIdentity *peer,
5512 const struct GNUNET_MessageHeader *message)
5514 struct GNUNET_MESH_ConnectionDestroy *msg;
5515 struct MeshConnection *c;
5519 msg = (struct GNUNET_MESH_ConnectionDestroy *) message;
5520 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5521 "Got a CONNECTION DESTROY message from %s\n",
5523 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5524 " for connection %s\n",
5525 GNUNET_h2s (&msg->cid));
5526 c = connection_get (&msg->cid);
5529 /* Probably already got the message from another path,
5530 * destroyed the tunnel and retransmitted to children.
5533 GNUNET_STATISTICS_update (stats, "# control on unknown tunnel",
5537 id = GNUNET_PEER_search (peer);
5538 if (id == connection_get_prev_hop (c)->id)
5540 else if (id == connection_get_next_hop (c)->id)
5544 GNUNET_break_op (0);
5547 send_prebuilt_message_connection (message, c, NULL, fwd);
5548 c->destroy = GNUNET_YES;
5555 * Handler for channel create messages.
5557 * @param t Tunnel this channel is to be created in.
5558 * @param msg Message.
5559 * @param fwd Is this FWD traffic? GNUNET_YES : GNUNET_NO;
5562 handle_channel_create (struct MeshTunnel2 *t,
5563 struct GNUNET_MESH_ChannelCreate *msg,
5566 MESH_ChannelNumber chid;
5567 struct MeshChannel *ch;
5568 struct MeshClient *c;
5571 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received Channel Create\n");
5572 /* Check message size */
5573 if (ntohs (msg->header.size) != sizeof (struct GNUNET_MESH_ChannelCreate))
5575 GNUNET_break_op (0);
5579 /* Check if channel exists */
5580 chid = ntohl (msg->chid);
5581 ch = channel_get (t, chid);
5584 /* Probably a retransmission, safe to ignore */
5585 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " already exists...\n");
5586 if (NULL != ch->dest)
5588 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " duplicate CC!!\n");
5589 channel_send_ack (ch, !fwd);
5595 /* Create channel */
5596 ch = channel_new (t, NULL, 0);
5597 channel_set_options (ch, ntohl (msg->opt));
5600 /* Find a destination client */
5601 port = ntohl (msg->port);
5602 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " port %u\n", port);
5603 c = GNUNET_CONTAINER_multihashmap32_get (ports, port);
5606 /* TODO send reject */
5607 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " no client has port registered\n");
5612 channel_add_client (ch, c);
5613 if (GNUNET_YES == ch->reliable)
5614 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! Reliable\n");
5616 send_local_channel_create (ch);
5617 channel_send_ack (ch, !fwd);
5618 send_local_ack (ch, !fwd);
5623 * Handler for channel ack messages.
5625 * @param t Tunnel this channel is to be created in.
5626 * @param msg Message.
5627 * @param fwd Is this FWD traffic? GNUNET_YES : GNUNET_NO;
5630 handle_channel_ack (struct MeshTunnel2 *t,
5631 struct GNUNET_MESH_ChannelManage *msg,
5634 MESH_ChannelNumber chid;
5635 struct MeshChannel *ch;
5637 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received Channel ACK\n");
5638 /* Check message size */
5639 if (ntohs (msg->header.size) != sizeof (struct GNUNET_MESH_ChannelManage))
5641 GNUNET_break_op (0);
5645 /* Check if channel exists */
5646 chid = ntohl (msg->chid);
5647 ch = channel_get (t, chid);
5650 GNUNET_break_op (0);
5651 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " channel %u unknown!!\n", chid);
5655 channel_confirm (ch, !fwd);
5660 * Handler for channel destroy messages.
5662 * @param t Tunnel this channel is to be destroyed of.
5663 * @param msg Message.
5664 * @param fwd Is this FWD traffic? GNUNET_YES : GNUNET_NO;
5667 handle_channel_destroy (struct MeshTunnel2 *t,
5668 struct GNUNET_MESH_ChannelManage *msg,
5671 MESH_ChannelNumber chid;
5672 struct MeshChannel *ch;
5674 /* Check message size */
5675 if (ntohs (msg->header.size) != sizeof (struct GNUNET_MESH_ChannelManage))
5677 GNUNET_break_op (0);
5681 /* Check if channel exists */
5682 chid = ntohl (msg->chid);
5683 ch = channel_get (t, chid);
5686 /* Probably a retransmission, safe to ignore */
5690 send_local_channel_destroy (ch, fwd);
5691 channel_destroy (ch);
5696 handle_decrypted (struct MeshTunnel2 *t,
5697 const struct GNUNET_MessageHeader *msgh,
5700 switch (ntohs (msgh->type))
5702 case GNUNET_MESSAGE_TYPE_MESH_DATA:
5703 /* Don't send hop ACK, wait for client to ACK */
5704 handle_data (t, (struct GNUNET_MESH_Data *) msgh, fwd);
5707 case GNUNET_MESSAGE_TYPE_MESH_DATA_ACK:
5708 handle_data_ack (t, (struct GNUNET_MESH_DataACK *) msgh, fwd);
5711 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE:
5712 handle_channel_create (t,
5713 (struct GNUNET_MESH_ChannelCreate *) msgh,
5717 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_ACK:
5718 handle_channel_ack (t,
5719 (struct GNUNET_MESH_ChannelManage *) msgh,
5723 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY:
5724 handle_channel_destroy (t,
5725 (struct GNUNET_MESH_ChannelManage *) msgh,
5730 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5731 "end-to-end message not known (%u)\n",
5732 ntohs (msgh->type));
5738 * Generic handler for mesh network encrypted traffic.
5740 * @param peer Peer identity this notification is about.
5741 * @param message Encrypted message.
5742 * @param fwd Is this FWD traffic? GNUNET_YES : GNUNET_NO;
5744 * @return GNUNET_OK to keep the connection open,
5745 * GNUNET_SYSERR to close it (signal serious error)
5748 handle_mesh_encrypted (const struct GNUNET_PeerIdentity *peer,
5749 const struct GNUNET_MESH_Encrypted *msg,
5752 struct MeshConnection *c;
5753 struct MeshTunnel2 *t;
5754 struct MeshPeer *neighbor;
5755 struct MeshFlowControl *fc;
5762 size = ntohs (msg->header.size);
5764 sizeof (struct GNUNET_MESH_Encrypted) +
5765 sizeof (struct GNUNET_MessageHeader))
5767 GNUNET_break_op (0);
5770 type = ntohs (msg->header.type);
5771 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "\n\n");
5772 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "got a %s message from %s\n",
5773 GNUNET_MESH_DEBUG_M2S (type), GNUNET_i2s (peer));
5775 /* Check connection */
5776 c = connection_get (&msg->cid);
5779 GNUNET_STATISTICS_update (stats, "# unknown connection", 1, GNUNET_NO);
5780 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "WARNING connection unknown\n");
5784 fc = fwd ? &c->fwd_fc : &c->bck_fc;
5786 /* Check if origin is as expected */
5787 neighbor = connection_get_hop (c, fwd);
5788 if (peer_get (peer)->id != neighbor->id)
5790 GNUNET_break_op (0);
5795 pid = ntohl (msg->pid);
5796 if (GMC_is_pid_bigger (pid, fc->last_ack_sent))
5798 GNUNET_STATISTICS_update (stats, "# unsolicited message", 1, GNUNET_NO);
5799 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5800 "WARNING Received PID %u, (prev %u), ACK %u\n",
5801 pid, fc->last_pid_recv, fc->last_ack_sent);
5804 if (GNUNET_NO == GMC_is_pid_bigger (pid, fc->last_pid_recv))
5806 GNUNET_STATISTICS_update (stats, "# duplicate PID", 1, GNUNET_NO);
5807 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5808 " Pid %u not expected (%u+), dropping!\n",
5809 pid, fc->last_pid_recv + 1);
5812 if (MESH_CONNECTION_SENT == c->state)
5813 connection_change_state (c, MESH_CONNECTION_READY);
5814 connection_reset_timeout (c, fwd);
5815 fc->last_pid_recv = pid;
5817 /* Is this message for us? */
5818 if (connection_is_terminal (c, fwd))
5820 size_t dsize = size - sizeof (struct GNUNET_MESH_Encrypted);
5822 struct GNUNET_MessageHeader *msgh;
5825 /* TODO signature verification */
5826 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " message for us!\n");
5827 GNUNET_STATISTICS_update (stats, "# messages received", 1, GNUNET_NO);
5829 fc->last_pid_recv = pid;
5830 tunnel_decrypt (t, cbuf, &msg[1], dsize, msg->iv, fwd);
5834 msgh = (struct GNUNET_MessageHeader *) &cbuf[off];
5835 handle_decrypted (t, msgh, fwd);
5836 off += ntohs (msgh->size);
5838 send_ack (c, NULL, fwd);
5842 /* Message not for us: forward to next hop */
5843 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " not for us, retransmitting...\n");
5844 ttl = ntohl (msg->ttl);
5845 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ttl: %u\n", ttl);
5848 GNUNET_STATISTICS_update (stats, "# TTL drops", 1, GNUNET_NO);
5849 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, " TTL is 0, DROPPING!\n");
5850 send_ack (c, NULL, fwd);
5853 GNUNET_STATISTICS_update (stats, "# messages forwarded", 1, GNUNET_NO);
5855 send_prebuilt_message_connection (&msg->header, c, NULL, fwd);
5862 * Core handler for mesh network traffic going orig->dest.
5864 * @param cls Closure (unused).
5865 * @param message Message received.
5866 * @param peer Peer who sent the message.
5868 * @return GNUNET_OK to keep the connection open,
5869 * GNUNET_SYSERR to close it (signal serious error)
5872 handle_mesh_fwd (void *cls, const struct GNUNET_PeerIdentity *peer,
5873 const struct GNUNET_MessageHeader *message)
5875 return handle_mesh_encrypted (peer,
5876 (struct GNUNET_MESH_Encrypted *)message,
5881 * Core handler for mesh network traffic going dest->orig.
5883 * @param cls Closure (unused).
5884 * @param message Message received.
5885 * @param peer Peer who sent the message.
5887 * @return GNUNET_OK to keep the connection open,
5888 * GNUNET_SYSERR to close it (signal serious error)
5891 handle_mesh_bck (void *cls, const struct GNUNET_PeerIdentity *peer,
5892 const struct GNUNET_MessageHeader *message)
5894 return handle_mesh_encrypted (peer,
5895 (struct GNUNET_MESH_Encrypted *)message,
5901 * Core handler for mesh network traffic point-to-point acks.
5903 * @param cls closure
5904 * @param message message
5905 * @param peer peer identity this notification is about
5907 * @return GNUNET_OK to keep the connection open,
5908 * GNUNET_SYSERR to close it (signal serious error)
5911 handle_mesh_ack (void *cls, const struct GNUNET_PeerIdentity *peer,
5912 const struct GNUNET_MessageHeader *message)
5914 struct GNUNET_MESH_ACK *msg;
5915 struct MeshConnection *c;
5916 struct MeshFlowControl *fc;
5920 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "\n\n");
5921 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got an ACK packet from %s!\n",
5923 msg = (struct GNUNET_MESH_ACK *) message;
5925 c = connection_get (&msg->cid);
5929 GNUNET_STATISTICS_update (stats, "# ack on unknown connection", 1,
5934 /* Is this a forward or backward ACK? */
5935 id = GNUNET_PEER_search (peer);
5936 if (connection_get_next_hop (c)->id == id)
5938 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " FWD ACK\n");
5941 else if (connection_get_prev_hop (c)->id == id)
5943 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " BCK ACK\n");
5948 GNUNET_break_op (0);
5952 ack = ntohl (msg->ack);
5953 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ACK %u\n", ack);
5955 /* Cancel polling if the ACK is bigger than before. */
5956 if (GNUNET_SCHEDULER_NO_TASK != fc->poll_task &&
5957 GMC_is_pid_bigger (ack, fc->last_ack_recv))
5959 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Cancel poll\n");
5960 GNUNET_SCHEDULER_cancel (fc->poll_task);
5961 fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
5962 fc->poll_time = GNUNET_TIME_UNIT_SECONDS;
5965 fc->last_ack_recv = ack;
5966 connection_unlock_queue (c, fc == &c->fwd_fc);
5973 * Core handler for mesh network traffic point-to-point ack polls.
5975 * @param cls closure
5976 * @param message message
5977 * @param peer peer identity this notification is about
5979 * @return GNUNET_OK to keep the connection open,
5980 * GNUNET_SYSERR to close it (signal serious error)
5983 handle_mesh_poll (void *cls, const struct GNUNET_PeerIdentity *peer,
5984 const struct GNUNET_MessageHeader *message)
5986 struct GNUNET_MESH_Poll *msg;
5987 struct MeshConnection *c;
5988 struct MeshFlowControl *fc;
5993 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "\n\n");
5994 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got a POLL packet from %s!\n",
5997 msg = (struct GNUNET_MESH_Poll *) message;
5999 c = connection_get (&msg->cid);
6003 GNUNET_STATISTICS_update (stats, "# poll on unknown connection", 1,
6005 GNUNET_break_op (0);
6009 /* Is this a forward or backward ACK?
6010 * Note: a poll should never be needed in a loopback case,
6011 * since there is no possiblility of packet loss there, so
6012 * this way of discerining FWD/BCK should not be a problem.
6014 id = GNUNET_PEER_search (peer);
6015 if (connection_get_next_hop (c)->id == id)
6017 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " FWD ACK\n");
6020 else if (connection_get_prev_hop (c)->id == id)
6022 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " BCK ACK\n");
6027 GNUNET_break_op (0);
6031 pid = ntohl (msg->pid);
6032 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " PID %u, OLD %u\n",
6033 pid, fc->last_pid_recv);
6034 fc->last_pid_recv = pid;
6035 fwd = fc == &c->fwd_fc;
6036 send_ack (c, NULL, fwd);
6043 * Core handler for mesh keepalives.
6045 * @param cls closure
6046 * @param message message
6047 * @param peer peer identity this notification is about
6048 * @return GNUNET_OK to keep the connection open,
6049 * GNUNET_SYSERR to close it (signal serious error)
6051 * TODO: Check who we got this from, to validate route.
6054 handle_mesh_keepalive (void *cls, const struct GNUNET_PeerIdentity *peer,
6055 const struct GNUNET_MessageHeader *message)
6057 struct GNUNET_MESH_ConnectionKeepAlive *msg;
6058 struct MeshConnection *c;
6059 struct MeshPeer *neighbor;
6062 msg = (struct GNUNET_MESH_ConnectionKeepAlive *) message;
6063 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "got a keepalive packet from %s\n",
6066 c = connection_get (&msg->cid);
6069 GNUNET_STATISTICS_update (stats, "# keepalive on unknown connection", 1,
6074 fwd = GNUNET_MESSAGE_TYPE_MESH_FWD_KEEPALIVE == ntohs (message->type) ?
6075 GNUNET_YES : GNUNET_NO;
6077 /* Check if origin is as expected */
6078 neighbor = connection_get_hop (c, fwd);
6079 if (peer_get (peer)->id != neighbor->id)
6081 GNUNET_break_op (0);
6085 connection_change_state (c, MESH_CONNECTION_READY);
6086 connection_reset_timeout (c, fwd);
6088 if (connection_is_terminal (c, fwd))
6091 GNUNET_STATISTICS_update (stats, "# keepalives forwarded", 1, GNUNET_NO);
6092 send_prebuilt_message_connection (message, c, NULL, fwd);
6100 * Functions to handle messages from core
6102 static struct GNUNET_CORE_MessageHandler core_handlers[] = {
6103 {&handle_mesh_connection_create, GNUNET_MESSAGE_TYPE_MESH_CONNECTION_CREATE,
6105 {&handle_mesh_connection_ack, GNUNET_MESSAGE_TYPE_MESH_CONNECTION_ACK,
6106 sizeof (struct GNUNET_MESH_ConnectionACK)},
6107 {&handle_mesh_connection_broken, GNUNET_MESSAGE_TYPE_MESH_CONNECTION_BROKEN,
6108 sizeof (struct GNUNET_MESH_ConnectionBroken)},
6109 {&handle_mesh_connection_destroy, GNUNET_MESSAGE_TYPE_MESH_CONNECTION_DESTROY,
6110 sizeof (struct GNUNET_MESH_ConnectionDestroy)},
6111 {&handle_mesh_keepalive, GNUNET_MESSAGE_TYPE_MESH_FWD_KEEPALIVE,
6112 sizeof (struct GNUNET_MESH_ConnectionKeepAlive)},
6113 {&handle_mesh_keepalive, GNUNET_MESSAGE_TYPE_MESH_BCK_KEEPALIVE,
6114 sizeof (struct GNUNET_MESH_ConnectionKeepAlive)},
6115 {&handle_mesh_ack, GNUNET_MESSAGE_TYPE_MESH_ACK,
6116 sizeof (struct GNUNET_MESH_ACK)},
6117 {&handle_mesh_poll, GNUNET_MESSAGE_TYPE_MESH_POLL,
6118 sizeof (struct GNUNET_MESH_Poll)},
6119 {&handle_mesh_fwd, GNUNET_MESSAGE_TYPE_MESH_FWD, 0},
6120 {&handle_mesh_bck, GNUNET_MESSAGE_TYPE_MESH_BCK, 0},
6126 * Function to process paths received for a new peer addition. The recorded
6127 * paths form the initial tunnel, which can be optimized later.
6128 * Called on each result obtained for the DHT search.
6130 * @param cls closure
6131 * @param exp when will this value expire
6132 * @param key key of the result
6133 * @param get_path path of the get request
6134 * @param get_path_length lenght of get_path
6135 * @param put_path path of the put request
6136 * @param put_path_length length of the put_path
6137 * @param type type of the result
6138 * @param size number of bytes in data
6139 * @param data pointer to the result data
6142 dht_get_id_handler (void *cls, struct GNUNET_TIME_Absolute exp,
6143 const struct GNUNET_HashCode * key,
6144 const struct GNUNET_PeerIdentity *get_path,
6145 unsigned int get_path_length,
6146 const struct GNUNET_PeerIdentity *put_path,
6147 unsigned int put_path_length, enum GNUNET_BLOCK_Type type,
6148 size_t size, const void *data)
6150 struct MeshPeer *peer = cls;
6151 struct MeshPeerPath *p;
6152 struct MeshConnection *c;
6153 struct GNUNET_PeerIdentity pi;
6156 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got results from DHT!\n");
6157 GNUNET_PEER_resolve (peer->id, &pi);
6158 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " for %s\n", GNUNET_i2s (&pi));
6160 p = path_build_from_dht (get_path, get_path_length,
6161 put_path, put_path_length);
6162 path_add_to_peers (p, GNUNET_NO);
6165 /* Count connections */
6166 for (c = peer->tunnel->connection_head, i = 0; NULL != c; c = c->next, i++);
6168 /* If we already have 3 (or more (?!)) connections, it's enough */
6172 if (peer->tunnel->state == MESH_TUNNEL_SEARCHING)
6174 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ... connect!\n");
6175 peer_connect (peer);
6181 /******************************************************************************/
6182 /********************* MESH LOCAL HANDLES **************************/
6183 /******************************************************************************/
6187 * Handler for client connection.
6189 * @param cls Closure (unused).
6190 * @param client Client handler.
6193 handle_local_client_connect (void *cls, struct GNUNET_SERVER_Client *client)
6195 struct MeshClient *c;
6199 c = GNUNET_malloc (sizeof (struct MeshClient));
6201 c->id = next_client_id++; /* overflow not important: just for debug */
6202 GNUNET_SERVER_client_keep (client);
6203 GNUNET_SERVER_client_set_user_context (client, c);
6204 GNUNET_CONTAINER_DLL_insert (clients_head, clients_tail, c);
6209 * Handler for client disconnection
6211 * @param cls closure
6212 * @param client identification of the client; NULL
6213 * for the last call when the server is destroyed
6216 handle_local_client_disconnect (void *cls, struct GNUNET_SERVER_Client *client)
6218 struct MeshClient *c;
6220 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "client disconnected: %p\n", client);
6223 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " (SERVER DOWN)\n");
6227 c = client_get (client);
6230 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "matching client found (%u, %p)\n",
6232 GNUNET_SERVER_client_drop (c->handle);
6233 c->shutting_down = GNUNET_YES;
6234 if (NULL != c->own_channels)
6236 GNUNET_CONTAINER_multihashmap32_iterate (c->own_channels,
6237 &channel_destroy_iterator, c);
6238 GNUNET_CONTAINER_multihashmap32_destroy (c->own_channels);
6241 if (NULL != c->incoming_channels)
6243 GNUNET_CONTAINER_multihashmap32_iterate (c->incoming_channels,
6244 &channel_destroy_iterator, c);
6245 GNUNET_CONTAINER_multihashmap32_destroy (c->incoming_channels);
6248 if (NULL != c->ports)
6250 GNUNET_CONTAINER_multihashmap32_iterate (c->ports,
6251 &client_release_ports, c);
6252 GNUNET_CONTAINER_multihashmap32_destroy (c->ports);
6254 GNUNET_CONTAINER_DLL_remove (clients_head, clients_tail, c);
6255 GNUNET_STATISTICS_update (stats, "# clients", -1, GNUNET_NO);
6256 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " client free (%p)\n", c);
6261 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, " context NULL!\n");
6263 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "done!\n");
6269 * Handler for new clients
6271 * @param cls closure
6272 * @param client identification of the client
6273 * @param message the actual message, which includes messages the client wants
6276 handle_local_new_client (void *cls, struct GNUNET_SERVER_Client *client,
6277 const struct GNUNET_MessageHeader *message)
6279 struct GNUNET_MESH_ClientConnect *cc_msg;
6280 struct MeshClient *c;
6285 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "new client connected %p\n", client);
6287 /* Check data sanity */
6288 size = ntohs (message->size) - sizeof (struct GNUNET_MESH_ClientConnect);
6289 cc_msg = (struct GNUNET_MESH_ClientConnect *) message;
6290 if (0 != (size % sizeof (uint32_t)))
6293 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
6296 size /= sizeof (uint32_t);
6298 /* Initialize new client structure */
6299 c = GNUNET_SERVER_client_get_user_context (client, struct MeshClient);
6300 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " client id %u\n", c->id);
6301 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " client has %u ports\n", size);
6306 p = (uint32_t *) &cc_msg[1];
6307 c->ports = GNUNET_CONTAINER_multihashmap32_create (size);
6308 for (i = 0; i < size; i++)
6311 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " port: %u\n", u32);
6313 /* store in client's hashmap */
6314 GNUNET_CONTAINER_multihashmap32_put (c->ports, u32, c,
6315 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST);
6316 /* store in global hashmap */
6317 /* FIXME only allow one client to have the port open,
6318 * have a backup hashmap with waiting clients */
6319 GNUNET_CONTAINER_multihashmap32_put (ports, u32, c,
6320 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
6324 c->own_channels = GNUNET_CONTAINER_multihashmap32_create (32);
6325 c->incoming_channels = GNUNET_CONTAINER_multihashmap32_create (32);
6326 GNUNET_SERVER_notification_context_add (nc, client);
6327 GNUNET_STATISTICS_update (stats, "# clients", 1, GNUNET_NO);
6329 GNUNET_SERVER_receive_done (client, GNUNET_OK);
6330 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "new client processed\n");
6335 * Handler for requests of new tunnels
6337 * @param cls Closure.
6338 * @param client Identification of the client.
6339 * @param message The actual message.
6342 handle_local_channel_create (void *cls, struct GNUNET_SERVER_Client *client,
6343 const struct GNUNET_MessageHeader *message)
6345 struct GNUNET_MESH_ChannelMessage *msg;
6346 struct MeshPeer *peer;
6347 struct MeshTunnel2 *t;
6348 struct MeshChannel *ch;
6349 struct MeshClient *c;
6350 MESH_ChannelNumber chid;
6352 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "new channel requested\n");
6354 /* Sanity check for client registration */
6355 if (NULL == (c = client_get (client)))
6358 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
6361 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
6363 /* Message size sanity check */
6364 if (sizeof (struct GNUNET_MESH_ChannelMessage) != ntohs (message->size))
6367 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
6371 msg = (struct GNUNET_MESH_ChannelMessage *) message;
6372 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " towards %s:%u\n",
6373 GNUNET_i2s (&msg->peer), ntohl (msg->port));
6374 chid = ntohl (msg->channel_id);
6376 /* Sanity check for duplicate channel IDs */
6377 if (NULL != channel_get_by_local_id (c, chid))
6380 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
6384 peer = peer_get (&msg->peer);
6385 if (NULL == peer->tunnel)
6387 peer->tunnel = tunnel_new ();
6388 peer->tunnel->peer = peer;
6392 /* Create channel */
6393 ch = channel_new (t, c, chid);
6397 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
6400 ch->port = ntohl (msg->port);
6401 channel_set_options (ch, ntohl (msg->opt));
6403 /* In unreliable channels, we'll use the DLL to buffer data for the root */
6404 ch->root_rel = GNUNET_new (struct MeshChannelReliability);
6405 ch->root_rel->ch = ch;
6406 ch->root_rel->expected_delay = MESH_RETRANSMIT_TIME;
6408 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "CREATED CHANNEL %s[%x]:%u (%x)\n",
6409 peer2s (t->peer), ch->gid, ch->port, ch->lid_root);
6410 peer_connect (peer);
6412 /* Send create channel */
6414 struct GNUNET_MESH_ChannelCreate msgcc;
6416 msgcc.header.size = htons (sizeof (msgcc));
6417 msgcc.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE);
6418 msgcc.chid = htonl (ch->gid);
6419 msgcc.port = msg->port;
6420 msgcc.opt = msg->opt;
6422 tunnel_queue_data (t, ch, &msgcc.header, GNUNET_YES);
6425 GNUNET_SERVER_receive_done (client, GNUNET_OK);
6431 * Handler for requests of deleting tunnels
6433 * @param cls closure
6434 * @param client identification of the client
6435 * @param message the actual message
6438 handle_local_channel_destroy (void *cls, struct GNUNET_SERVER_Client *client,
6439 const struct GNUNET_MessageHeader *message)
6441 struct GNUNET_MESH_ChannelMessage *msg;
6442 struct MeshClient *c;
6443 struct MeshChannel *ch;
6444 struct MeshTunnel2 *t;
6445 MESH_ChannelNumber chid;
6447 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
6448 "Got a DESTROY CHANNEL from client!\n");
6450 /* Sanity check for client registration */
6451 if (NULL == (c = client_get (client)))
6454 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
6457 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
6459 /* Message sanity check */
6460 if (sizeof (struct GNUNET_MESH_ChannelMessage) != ntohs (message->size))
6463 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
6467 msg = (struct GNUNET_MESH_ChannelMessage *) message;
6469 /* Retrieve tunnel */
6470 chid = ntohl (msg->channel_id);
6471 ch = channel_get_by_local_id (c, chid);
6474 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, " channel %X not found\n", chid);
6476 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
6480 /* Cleanup after the tunnel */
6481 client_delete_channel (c, ch);
6482 if (c == ch->dest && GNUNET_MESH_LOCAL_CHANNEL_ID_SERV <= chid)
6486 else if (c == ch->root && GNUNET_MESH_LOCAL_CHANNEL_ID_SERV > chid)
6492 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
6493 " channel %X client %p (%p, %p)\n",
6494 chid, c, ch->root, ch->dest);
6499 channel_destroy (ch);
6500 tunnel_destroy_if_empty (t);
6502 GNUNET_SERVER_receive_done (client, GNUNET_OK);
6508 * Handler for client traffic
6510 * @param cls closure
6511 * @param client identification of the client
6512 * @param message the actual message
6515 handle_local_data (void *cls, struct GNUNET_SERVER_Client *client,
6516 const struct GNUNET_MessageHeader *message)
6518 struct GNUNET_MESH_LocalData *msg;
6519 struct MeshClient *c;
6520 struct MeshChannel *ch;
6521 struct MeshChannelReliability *rel;
6522 MESH_ChannelNumber chid;
6526 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
6527 "Got data from a client!\n");
6529 /* Sanity check for client registration */
6530 if (NULL == (c = client_get (client)))
6533 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
6536 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
6538 msg = (struct GNUNET_MESH_LocalData *) message;
6540 /* Sanity check for message size */
6541 size = ntohs (message->size) - sizeof (struct GNUNET_MESH_LocalData);
6542 if (size < sizeof (struct GNUNET_MessageHeader))
6545 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
6549 /* Channel exists? */
6550 chid = ntohl (msg->id);
6551 fwd = chid < GNUNET_MESH_LOCAL_CHANNEL_ID_SERV;
6552 ch = channel_get_by_local_id (c, chid);
6556 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
6560 /* Is the client in the channel? */
6563 ch->root->handle == client)
6567 ch->dest->handle == client) ) )
6570 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
6574 rel = fwd ? ch->root_rel : ch->dest_rel;
6575 rel->client_ready = GNUNET_NO;
6577 /* Ok, everything is correct, send the message. */
6579 struct GNUNET_MESH_Data *payload;
6580 uint16_t p2p_size = sizeof(struct GNUNET_MESH_Data) + size;
6581 unsigned char cbuf[p2p_size];
6583 payload = (struct GNUNET_MESH_Data *) cbuf;
6584 payload->mid = htonl (rel->mid_send);
6586 memcpy (&payload[1], &msg[1], size);
6587 payload->header.size = htons (p2p_size);
6588 payload->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_DATA);
6589 payload->chid = htonl (ch->gid);
6590 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " sending on channel...\n");
6591 send_prebuilt_message_channel (&payload->header, ch, fwd);
6593 if (GNUNET_YES == ch->reliable)
6594 channel_save_copy (ch, &payload->header, fwd);
6596 if (tunnel_get_buffer (ch->t, fwd) > 0)
6597 send_local_ack (ch, fwd);
6598 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "receive done OK\n");
6599 GNUNET_SERVER_receive_done (client, GNUNET_OK);
6606 * Handler for client's ACKs for payload traffic.
6608 * @param cls Closure (unused).
6609 * @param client Identification of the client.
6610 * @param message The actual message.
6613 handle_local_ack (void *cls, struct GNUNET_SERVER_Client *client,
6614 const struct GNUNET_MessageHeader *message)
6616 struct GNUNET_MESH_LocalAck *msg;
6617 struct MeshChannelReliability *rel;
6618 struct MeshChannel *ch;
6619 struct MeshClient *c;
6620 MESH_ChannelNumber chid;
6623 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got a local ACK\n");
6625 /* Sanity check for client registration */
6626 if (NULL == (c = client_get (client)))
6629 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
6632 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
6634 msg = (struct GNUNET_MESH_LocalAck *) message;
6636 /* Channel exists? */
6637 chid = ntohl (msg->channel_id);
6638 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " on channel %X\n", chid);
6639 ch = channel_get_by_local_id (c, chid);
6640 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " -- ch %p\n", ch);
6644 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Channel %X unknown.\n", chid);
6645 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, " for client %u.\n", c->id);
6646 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
6650 /* If client is root, the ACK is going FWD, therefore this is "BCK". */
6651 /* If client is dest, the ACK is going BCK, therefore this is "FWD" */
6652 fwd = chid >= GNUNET_MESH_LOCAL_CHANNEL_ID_SERV;
6653 rel = fwd ? ch->dest_rel : ch->root_rel;
6655 rel->client_ready = GNUNET_YES;
6656 channel_send_client_buffered_data (ch, c, fwd);
6657 send_ack (NULL, ch, fwd);
6659 GNUNET_SERVER_receive_done (client, GNUNET_OK);
6666 * Iterator over all tunnels to send a monitoring client info about each tunnel.
6668 * @param cls Closure (client handle).
6669 * @param key Key (hashed tunnel ID, unused).
6670 * @param value Tunnel info.
6672 * @return GNUNET_YES, to keep iterating.
6675 // monitor_all_tunnels_iterator (void *cls,
6676 // const struct GNUNET_HashCode * key,
6679 // struct GNUNET_SERVER_Client *client = cls;
6680 // struct MeshChannel *ch = value;
6681 // struct GNUNET_MESH_LocalMonitor *msg;
6683 // msg = GNUNET_malloc (sizeof(struct GNUNET_MESH_LocalMonitor));
6684 // msg->channel_id = htonl (ch->gid);
6685 // msg->header.size = htons (sizeof (struct GNUNET_MESH_LocalMonitor));
6686 // msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_TUNNELS);
6688 // GNUNET_log (GNUNET_ERROR_TYPE_INFO,
6689 // "* sending info about tunnel %s\n",
6690 // GNUNET_i2s (&msg->owner));
6692 // GNUNET_SERVER_notification_context_unicast (nc, client,
6693 // &msg->header, GNUNET_NO);
6694 // return GNUNET_YES;
6699 * Handler for client's MONITOR request.
6701 * @param cls Closure (unused).
6702 * @param client Identification of the client.
6703 * @param message The actual message.
6706 handle_local_get_tunnels (void *cls, struct GNUNET_SERVER_Client *client,
6707 const struct GNUNET_MessageHeader *message)
6709 struct MeshClient *c;
6711 /* Sanity check for client registration */
6712 if (NULL == (c = client_get (client)))
6715 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
6719 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
6720 "Received get tunnels request from client %u\n",
6722 // GNUNET_CONTAINER_multihashmap_iterate (tunnels,
6723 // monitor_all_tunnels_iterator,
6725 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
6726 "Get tunnels request from client %u completed\n",
6728 GNUNET_SERVER_receive_done (client, GNUNET_OK);
6733 * Handler for client's MONITOR_TUNNEL request.
6735 * @param cls Closure (unused).
6736 * @param client Identification of the client.
6737 * @param message The actual message.
6740 handle_local_show_tunnel (void *cls, struct GNUNET_SERVER_Client *client,
6741 const struct GNUNET_MessageHeader *message)
6743 const struct GNUNET_MESH_LocalMonitor *msg;
6744 struct GNUNET_MESH_LocalMonitor *resp;
6745 struct MeshClient *c;
6746 struct MeshChannel *ch;
6748 /* Sanity check for client registration */
6749 if (NULL == (c = client_get (client)))
6752 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
6756 msg = (struct GNUNET_MESH_LocalMonitor *) message;
6757 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
6758 "Received tunnel info request from client %u for tunnel %s[%X]\n",
6761 ntohl (msg->channel_id));
6762 // ch = channel_get (&msg->owner, ntohl (msg->channel_id));
6766 /* We don't know the tunnel */
6767 struct GNUNET_MESH_LocalMonitor warn;
6770 GNUNET_SERVER_notification_context_unicast (nc, client,
6773 GNUNET_SERVER_receive_done (client, GNUNET_OK);
6777 /* Initialize context */
6778 resp = GNUNET_malloc (sizeof (struct GNUNET_MESH_LocalMonitor));
6780 resp->header.size = htons (sizeof (struct GNUNET_MESH_LocalMonitor));
6781 GNUNET_SERVER_notification_context_unicast (nc, c->handle,
6782 &resp->header, GNUNET_NO);
6785 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
6786 "Monitor tunnel request from client %u completed\n",
6788 GNUNET_SERVER_receive_done (client, GNUNET_OK);
6793 * Functions to handle messages from clients
6795 static struct GNUNET_SERVER_MessageHandler client_handlers[] = {
6796 {&handle_local_new_client, NULL,
6797 GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT, 0},
6798 {&handle_local_channel_create, NULL,
6799 GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE,
6800 sizeof (struct GNUNET_MESH_ChannelMessage)},
6801 {&handle_local_channel_destroy, NULL,
6802 GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY,
6803 sizeof (struct GNUNET_MESH_ChannelMessage)},
6804 {&handle_local_data, NULL,
6805 GNUNET_MESSAGE_TYPE_MESH_LOCAL_DATA, 0},
6806 {&handle_local_ack, NULL,
6807 GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK,
6808 sizeof (struct GNUNET_MESH_LocalAck)},
6809 {&handle_local_get_tunnels, NULL,
6810 GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_TUNNELS,
6811 sizeof (struct GNUNET_MessageHeader)},
6812 {&handle_local_show_tunnel, NULL,
6813 GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_TUNNEL,
6814 sizeof (struct GNUNET_MESH_LocalMonitor)},
6820 * Method called whenever a given peer connects.
6822 * @param cls closure
6823 * @param peer peer identity this notification is about
6826 core_connect (void *cls, const struct GNUNET_PeerIdentity *peer)
6828 struct MeshPeer *pi;
6829 struct MeshPeerPath *path;
6831 DEBUG_CONN ("Peer connected\n");
6832 DEBUG_CONN (" %s\n", GNUNET_i2s (&my_full_id));
6833 pi = peer_get (peer);
6836 DEBUG_CONN (" (self)\n");
6837 path = path_new (1);
6841 DEBUG_CONN (" %s\n", GNUNET_i2s (peer));
6842 path = path_new (2);
6843 path->peers[1] = pi->id;
6844 GNUNET_PEER_change_rc (pi->id, 1);
6845 GNUNET_STATISTICS_update (stats, "# peers", 1, GNUNET_NO);
6847 path->peers[0] = myid;
6848 GNUNET_PEER_change_rc (myid, 1);
6849 peer_add_path (pi, path, GNUNET_YES);
6851 pi->connections = GNUNET_CONTAINER_multihashmap_create (32, GNUNET_YES);
6857 * Method called whenever a peer disconnects.
6859 * @param cls closure
6860 * @param peer peer identity this notification is about
6863 core_disconnect (void *cls, const struct GNUNET_PeerIdentity *peer)
6865 struct MeshPeer *pi;
6867 DEBUG_CONN ("Peer disconnected\n");
6868 pi = GNUNET_CONTAINER_multihashmap_get (peers, &peer->hashPubKey);
6875 peer_remove_path (pi, myid, pi->id);
6877 GNUNET_CONTAINER_multihashmap_iterate (pi->connections,
6880 GNUNET_CONTAINER_multihashmap_destroy (pi->connections);
6881 pi->connections = NULL;
6884 DEBUG_CONN (" (self)\n");
6886 GNUNET_STATISTICS_update (stats, "# peers", -1, GNUNET_NO);
6893 * Install server (service) handlers and start listening to clients.
6898 GNUNET_SERVER_add_handlers (server_handle, client_handlers);
6899 GNUNET_SERVER_connect_notify (server_handle,
6900 &handle_local_client_connect, NULL);
6901 GNUNET_SERVER_disconnect_notify (server_handle,
6902 &handle_local_client_disconnect, NULL);
6903 nc = GNUNET_SERVER_notification_context_create (server_handle, 1);
6905 clients_head = NULL;
6906 clients_tail = NULL;
6908 GNUNET_SERVER_resume (server_handle);
6913 * To be called on core init/fail.
6915 * @param cls Closure (config)
6916 * @param identity the public identity of this peer
6919 core_init (void *cls,
6920 const struct GNUNET_PeerIdentity *identity)
6922 const struct GNUNET_CONFIGURATION_Handle *c = cls;
6925 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Core init\n");
6926 if (0 != memcmp (identity, &my_full_id, sizeof (my_full_id)))
6928 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, _("Wrong CORE service\n"));
6929 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
6931 GNUNET_i2s (identity));
6932 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
6934 GNUNET_i2s (&my_full_id));
6935 GNUNET_CORE_disconnect (core_handle);
6936 core_handle = GNUNET_CORE_connect (c, /* Main configuration */
6937 NULL, /* Closure passed to MESH functions */
6938 &core_init, /* Call core_init once connected */
6939 &core_connect, /* Handle connects */
6940 &core_disconnect, /* remove peers on disconnects */
6941 NULL, /* Don't notify about all incoming messages */
6942 GNUNET_NO, /* For header only in notification */
6943 NULL, /* Don't notify about all outbound messages */
6944 GNUNET_NO, /* For header-only out notification */
6945 core_handlers); /* Register these handlers */
6954 /******************************************************************************/
6955 /************************ MAIN FUNCTIONS ****************************/
6956 /******************************************************************************/
6959 * Iterator over tunnel hash map entries to destroy the tunnel during shutdown.
6961 * @param cls closure
6962 * @param key current key code
6963 * @param value value in the hash map
6964 * @return GNUNET_YES if we should continue to iterate,
6968 shutdown_tunnel (void *cls, const struct GNUNET_HashCode * key, void *value)
6970 struct MeshPeer *p = value;
6971 struct MeshTunnel2 *t = p->tunnel;
6980 * Task run during shutdown.
6986 shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
6988 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "shutting down\n");
6990 if (core_handle != NULL)
6992 GNUNET_CORE_disconnect (core_handle);
6995 GNUNET_CONTAINER_multihashmap_iterate (peers, &shutdown_tunnel, NULL);
6996 if (dht_handle != NULL)
6998 GNUNET_DHT_disconnect (dht_handle);
7003 GNUNET_SERVER_notification_context_destroy (nc);
7006 if (GNUNET_SCHEDULER_NO_TASK != announce_id_task)
7008 GNUNET_SCHEDULER_cancel (announce_id_task);
7009 announce_id_task = GNUNET_SCHEDULER_NO_TASK;
7011 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "shut down\n");
7016 * Process mesh requests.
7018 * @param cls closure
7019 * @param server the initialized server
7020 * @param c configuration to use
7023 run (void *cls, struct GNUNET_SERVER_Handle *server,
7024 const struct GNUNET_CONFIGURATION_Handle *c)
7027 struct GNUNET_CRYPTO_EccPrivateKey *pk;
7029 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "starting to run\n");
7030 server_handle = server;
7031 GNUNET_SERVER_suspend (server_handle);
7034 GNUNET_CONFIGURATION_get_value_filename (c, "PEER", "PRIVATE_KEY",
7037 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
7039 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
7040 "mesh", "peer/privatekey");
7041 GNUNET_SCHEDULER_shutdown ();
7046 GNUNET_CONFIGURATION_get_value_time (c, "MESH", "REFRESH_CONNECTION_TIME",
7047 &refresh_connection_time))
7049 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
7051 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
7052 "mesh", "refresh path time");
7053 GNUNET_SCHEDULER_shutdown ();
7058 GNUNET_CONFIGURATION_get_value_time (c, "MESH", "ID_ANNOUNCE_TIME",
7061 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
7063 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
7064 "mesh", "id announce time");
7065 GNUNET_SCHEDULER_shutdown ();
7070 GNUNET_CONFIGURATION_get_value_time (c, "MESH", "CONNECT_TIMEOUT",
7073 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
7075 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
7076 "mesh", "connect timeout");
7077 GNUNET_SCHEDULER_shutdown ();
7082 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "MAX_MSGS_QUEUE",
7085 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
7087 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
7088 "mesh", "max msgs queue");
7089 GNUNET_SCHEDULER_shutdown ();
7094 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "MAX_CONNECTIONS",
7097 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
7099 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
7100 "mesh", "max tunnels");
7101 GNUNET_SCHEDULER_shutdown ();
7106 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "DEFAULT_TTL",
7109 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
7111 ("%s service is lacking key configuration settings (%s). Using default (%u).\n"),
7112 "mesh", "default ttl", 64);
7117 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "MAX_PEERS",
7120 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
7121 _("%s service is lacking key configuration settings (%s). Using default (%u).\n"),
7122 "mesh", "max peers", 1000);
7127 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "DROP_PERCENT",
7134 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
7135 "Mesh is running with drop mode enabled. "
7136 "This is NOT a good idea! "
7137 "Remove the DROP_PERCENT option from your configuration.\n");
7141 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "DHT_REPLICATION_LEVEL",
7142 &dht_replication_level))
7144 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
7146 ("%s service is lacking key configuration settings (%s). Using default (%u).\n"),
7147 "mesh", "dht replication level", 3);
7148 dht_replication_level = 3;
7151 connections = GNUNET_CONTAINER_multihashmap_create (32, GNUNET_YES);
7152 peers = GNUNET_CONTAINER_multihashmap_create (32, GNUNET_NO);
7153 ports = GNUNET_CONTAINER_multihashmap32_create (32);
7155 dht_handle = GNUNET_DHT_connect (c, 64);
7156 if (NULL == dht_handle)
7160 stats = GNUNET_STATISTICS_create ("mesh", c);
7162 /* Scheduled the task to clean up when shutdown is called */
7163 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &shutdown_task,
7165 pk = GNUNET_CRYPTO_ecc_key_create_from_file (keyfile);
7166 GNUNET_free (keyfile);
7167 GNUNET_assert (NULL != pk);
7168 my_private_key = pk;
7169 GNUNET_CRYPTO_ecc_key_get_public (my_private_key, &my_public_key);
7170 GNUNET_CRYPTO_hash (&my_public_key, sizeof (my_public_key),
7171 &my_full_id.hashPubKey);
7172 myid = GNUNET_PEER_intern (&my_full_id);
7173 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
7174 "Mesh for peer [%s] starting\n",
7175 GNUNET_i2s(&my_full_id));
7177 core_handle = GNUNET_CORE_connect (c, /* Main configuration */
7178 NULL, /* Closure passed to MESH functions */
7179 &core_init, /* Call core_init once connected */
7180 &core_connect, /* Handle connects */
7181 &core_disconnect, /* remove peers on disconnects */
7182 NULL, /* Don't notify about all incoming messages */
7183 GNUNET_NO, /* For header only in notification */
7184 NULL, /* Don't notify about all outbound messages */
7185 GNUNET_NO, /* For header-only out notification */
7186 core_handlers); /* Register these handlers */
7187 if (NULL == core_handle)
7190 GNUNET_SCHEDULER_shutdown ();
7193 announce_id_task = GNUNET_SCHEDULER_add_now (&announce_id, cls);
7194 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Mesh service running\n");
7199 * The main function for the mesh service.
7201 * @param argc number of arguments from the command line
7202 * @param argv command line arguments
7203 * @return 0 ok, 1 on error
7206 main (int argc, char *const *argv)
7211 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "main()\n");
7212 r = GNUNET_SERVICE_run (argc, argv, "mesh", GNUNET_SERVICE_OPTION_NONE, &run,
7214 ret = (GNUNET_OK == r) ? 0 : 1;
7215 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "main() END\n");