2 This file is part of GNUnet.
3 (C) 2001-2013 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
22 * @file mesh/gnunet-service-mesh-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: %u\n",
1594 GNUNET_h2s (&c->id), c->state);
1595 if (MESH_CONNECTION_READY == c->state)
1597 fc = fwd ? &c->fwd_fc : &c->bck_fc;
1603 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " q_n %u, \n", fc->queue_n);
1604 if (fc->queue_n < lowest_q)
1607 lowest_q = fc->queue_n;
1616 * Is this peer the first one on the connection?
1618 * @param c Connection.
1619 * @param fwd Is this about fwd traffic?
1621 * @return GNUNET_YES if origin, GNUNET_NO if relay/terminal.
1624 connection_is_origin (struct MeshConnection *c, int fwd)
1626 if (!fwd && c->own_pos == c->path->length - 1)
1628 if (fwd && c->own_pos == 0)
1635 * Is this peer the last one on the connection?
1637 * @param c Connection.
1638 * @param fwd Is this about fwd traffic?
1639 * Note that the ROOT is the terminal for BCK traffic!
1641 * @return GNUNET_YES if terminal, GNUNET_NO if relay/origin.
1644 connection_is_terminal (struct MeshConnection *c, int fwd)
1646 if (fwd && c->own_pos == c->path->length - 1)
1648 if (!fwd && c->own_pos == 0)
1655 * Is the recipient client for this channel on this peer?
1657 * @param ch Channel.
1658 * @param fwd Is this for fwd traffic?
1660 * @return GNUNET_YES in case it is.
1663 channel_is_terminal (struct MeshChannel *ch, int fwd)
1665 if (NULL == ch->t || NULL == ch->t->connection_head)
1670 return connection_is_terminal (ch->t->connection_head, fwd);
1675 * Get free buffer space towards the client on a specific channel.
1677 * @param ch Channel.
1678 * @param fwd Is query about FWD traffic?
1680 * @return Free buffer space [0 - 64]
1683 channel_get_buffer (struct MeshChannel *ch, int fwd)
1685 struct MeshChannelReliability *rel;
1687 rel = fwd ? ch->dest_rel : ch->root_rel;
1689 /* If rel is NULL it means that the end is not yet created,
1690 * most probably is a loopback channel at the point of sending
1691 * the ChannelCreate to itself.
1696 return (64 - rel->n_recv);
1701 * Get free buffer space in a connection.
1703 * @param c Connection.
1704 * @param fwd Is query about FWD traffic?
1706 * @return Free buffer space [0 - max_msgs_queue/max_connections]
1709 connection_get_buffer (struct MeshConnection *c, int fwd)
1711 struct MeshFlowControl *fc;
1713 fc = fwd ? &c->fwd_fc : &c->bck_fc;
1715 return (fc->queue_max - fc->queue_n);
1720 * Get the total buffer space for a tunnel.
1723 tunnel_get_buffer (struct MeshTunnel2 *t, int fwd)
1725 struct MeshConnection *c;
1726 struct MeshFlowControl *fc;
1727 unsigned int buffer;
1729 c = t->connection_head;
1738 /* If terminal, return biggest channel buffer */
1739 if (connection_is_terminal (c, fwd))
1741 struct MeshChannel *ch;
1742 unsigned int ch_buf;
1744 if (NULL == t->channel_head)
1747 for (ch = t->channel_head; NULL != ch; ch = ch->next)
1749 ch_buf = channel_get_buffer (ch, fwd);
1750 if (ch_buf > buffer)
1756 /* If not terminal, return sum of connection buffers */
1759 if (c->state != MESH_CONNECTION_READY)
1762 fc = fwd ? &c->fwd_fc : &c->bck_fc;
1763 buffer += fc->last_ack_recv - fc->last_pid_sent;
1772 * FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME
1773 * Encrypt data with the tunnel key.
1775 * @param t Tunnel whose key to use.
1776 * @param dst Destination for the encrypted data.
1777 * @param src Source of the plaintext.
1778 * @param size Size of the plaintext.
1779 * @param iv Initialization Vector to use.
1780 * @param fwd Is this a fwd message?
1783 tunnel_encrypt (struct MeshTunnel2 *t,
1784 void *dst, const void *src,
1785 size_t size, uint64_t iv, int fwd)
1787 memcpy (dst, src, size);
1792 * FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME
1793 * Decrypt data with the tunnel key.
1795 * @param t Tunnel whose key to use.
1796 * @param dst Destination for the plaintext.
1797 * @param src Source of the encrypted data.
1798 * @param size Size of the encrypted data.
1799 * @param iv Initialization Vector to use.
1800 * @param fwd Is this a fwd message?
1803 tunnel_decrypt (struct MeshTunnel2 *t,
1804 void *dst, const void *src,
1805 size_t size, uint64_t iv, int fwd)
1807 memcpy (dst, src, size);
1812 * Sends an already built message on a connection, properly registering
1813 * all used resources.
1815 * @param message Message to send. Function makes a copy of it.
1816 * If message is not hop-by-hop, decrements TTL of copy.
1817 * @param c Connection on which this message is transmitted.
1818 * @param ch Channel on which this message is transmitted, or NULL.
1819 * @param fwd Is this a fwd message?
1822 send_prebuilt_message_connection (const struct GNUNET_MessageHeader *message,
1823 struct MeshConnection *c,
1824 struct MeshChannel *ch,
1831 size = ntohs (message->size);
1832 data = GNUNET_malloc (size);
1833 memcpy (data, message, size);
1834 type = ntohs (message->type);
1835 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Send %s (%u) on connection %s\n",
1836 GNUNET_MESH_DEBUG_M2S (type), size, GNUNET_h2s (&c->id));
1840 struct GNUNET_MESH_Encrypted *emsg;
1841 struct GNUNET_MESH_ACK *amsg;
1842 struct GNUNET_MESH_Poll *pmsg;
1843 struct GNUNET_MESH_ConnectionDestroy *dmsg;
1844 struct GNUNET_MESH_ConnectionBroken *bmsg;
1847 case GNUNET_MESSAGE_TYPE_MESH_FWD:
1848 case GNUNET_MESSAGE_TYPE_MESH_BCK:
1849 emsg = (struct GNUNET_MESH_Encrypted *) data;
1850 ttl = ntohl (emsg->ttl);
1853 GNUNET_break_op (0);
1857 emsg->ttl = htonl (ttl - 1);
1858 emsg->pid = htonl (fwd ? c->fwd_fc.next_pid++ : c->bck_fc.next_pid++);
1859 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " pid %u\n", ntohl (emsg->pid));
1862 case GNUNET_MESSAGE_TYPE_MESH_ACK:
1863 amsg = (struct GNUNET_MESH_ACK *) data;
1865 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ack %u\n", ntohl (amsg->ack));
1868 case GNUNET_MESSAGE_TYPE_MESH_POLL:
1869 pmsg = (struct GNUNET_MESH_Poll *) data;
1871 pmsg->pid = htonl (fwd ? c->fwd_fc.last_pid_sent : c->bck_fc.last_pid_sent);
1872 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " poll %u\n", ntohl (pmsg->pid));
1875 case GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY:
1876 dmsg = (struct GNUNET_MESH_ConnectionDestroy *) data;
1881 case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_BROKEN:
1882 bmsg = (struct GNUNET_MESH_ConnectionBroken *) data;
1887 case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_CREATE:
1888 case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_ACK:
1905 * Sends an already built message on a tunnel, choosing the best connection.
1907 * @param message Message to send. Function modifies it.
1908 * @param t Tunnel on which this message is transmitted.
1909 * @param ch Channel on which this message is transmitted.
1910 * @param fwd Is this a fwd message?
1913 send_prebuilt_message_tunnel (struct GNUNET_MESH_Encrypted *msg,
1914 struct MeshTunnel2 *t,
1915 struct MeshChannel *ch,
1918 struct MeshConnection *c;
1921 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Send on Tunnel %s\n",
1923 c = tunnel_get_connection (t, fwd);
1926 GNUNET_break (GNUNET_YES == t->destroy);
1929 type = ntohs (msg->header.type);
1932 case GNUNET_MESSAGE_TYPE_MESH_FWD:
1933 case GNUNET_MESSAGE_TYPE_MESH_BCK:
1934 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE:
1935 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY:
1937 msg->ttl = htonl (default_ttl);
1940 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "unkown type %s\n",
1941 GNUNET_MESH_DEBUG_M2S (type));
1946 send_prebuilt_message_connection (&msg->header, c, ch, fwd);
1951 * Sends an already built message on a channel, properly registering
1952 * all used resources and encrypting the message with the tunnel's key.
1954 * @param message Message to send. Function makes a copy of it.
1955 * @param ch Channel on which this message is transmitted.
1956 * @param fwd Is this a fwd message?
1959 send_prebuilt_message_channel (const struct GNUNET_MessageHeader *message,
1960 struct MeshChannel *ch,
1963 struct GNUNET_MESH_Encrypted *msg;
1964 size_t size = ntohs (message->size);
1965 char *cbuf[sizeof (struct GNUNET_MESH_Encrypted) + size];
1969 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Send on Channel %s:%X %s\n",
1970 peer2s (ch->t->peer), ch->gid, fwd ? "FWD" : "BCK");
1971 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " %s\n",
1972 GNUNET_MESH_DEBUG_M2S (ntohs (message->type)));
1974 if (channel_is_terminal (ch, fwd))
1976 handle_decrypted (ch->t, message, fwd);
1980 type = fwd ? GNUNET_MESSAGE_TYPE_MESH_FWD : GNUNET_MESSAGE_TYPE_MESH_BCK;
1981 iv = GNUNET_CRYPTO_random_u64 (GNUNET_CRYPTO_QUALITY_NONCE, UINT64_MAX);
1983 msg = (struct GNUNET_MESH_Encrypted *) cbuf;
1984 msg->header.type = htons (type);
1985 msg->header.size = htons (sizeof (struct GNUNET_MESH_Encrypted) + size);
1986 msg->iv = GNUNET_htonll (iv);
1987 tunnel_encrypt (ch->t, &msg[1], message, size, iv, fwd);
1988 send_prebuilt_message_tunnel (msg, ch->t, ch, fwd);
1993 * Sends a CREATE CONNECTION message for a path to a peer.
1994 * Changes the connection and tunnel states if necessary.
1996 * @param connection Connection to create.
1999 send_connection_create (struct MeshConnection *connection)
2001 struct MeshTunnel2 *t;
2004 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Send connection create\n");
2006 GNUNET_MESSAGE_TYPE_MESH_CONNECTION_CREATE,
2007 sizeof (struct GNUNET_MESH_ConnectionCreate) +
2008 (connection->path->length *
2009 sizeof (struct GNUNET_PeerIdentity)),
2014 (MESH_TUNNEL_SEARCHING == t->state || MESH_TUNNEL_NEW == t->state))
2015 tunnel_change_state (t, MESH_TUNNEL_WAITING);
2016 if (MESH_CONNECTION_NEW == connection->state)
2017 connection_change_state (connection, MESH_CONNECTION_SENT);
2022 * Sends a CONNECTION ACK message in reponse to a received CONNECTION_CREATE
2025 * @param connection Connection to confirm.
2026 * @param fwd Is this a fwd ACK? (First is bck (SYNACK), second is fwd (ACK))
2029 send_connection_ack (struct MeshConnection *connection, int fwd)
2031 struct MeshTunnel2 *t;
2034 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Send connection ack\n");
2036 GNUNET_MESSAGE_TYPE_MESH_CONNECTION_ACK,
2037 sizeof (struct GNUNET_MESH_ConnectionACK),
2041 if (MESH_TUNNEL_NEW == t->state)
2042 tunnel_change_state (t, MESH_TUNNEL_WAITING);
2043 if (MESH_CONNECTION_READY != connection->state)
2044 connection_change_state (connection, MESH_CONNECTION_SENT);
2049 * Core callback to write a pre-constructed data packet to core buffer
2051 * @param cls Closure (MeshTransmissionDescriptor with data in "data" member).
2052 * @param size Number of bytes available in buf.
2053 * @param buf Where the to write the message.
2055 * @return number of bytes written to buf
2058 send_core_data_raw (void *cls, size_t size, void *buf)
2060 struct GNUNET_MessageHeader *msg = cls;
2063 GNUNET_assert (NULL != msg);
2064 total_size = ntohs (msg->size);
2066 if (total_size > size)
2071 memcpy (buf, msg, total_size);
2078 * Function to send a create connection message to a peer.
2080 * @param c Connection to create.
2081 * @param size number of bytes available in buf
2082 * @param buf where the callee should write the message
2083 * @return number of bytes written to buf
2086 send_core_connection_create (struct MeshConnection *c, size_t size, void *buf)
2088 struct GNUNET_MESH_ConnectionCreate *msg;
2089 struct GNUNET_PeerIdentity *peer_ptr;
2090 struct MeshPeerPath *p = c->path;
2094 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Sending CONNECTION CREATE...\n");
2096 sizeof (struct GNUNET_MESH_ConnectionCreate) +
2097 p->length * sizeof (struct GNUNET_PeerIdentity);
2099 if (size < size_needed || NULL == buf)
2104 msg = (struct GNUNET_MESH_ConnectionCreate *) buf;
2105 msg->header.size = htons (size_needed);
2106 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CONNECTION_CREATE);
2109 peer_ptr = (struct GNUNET_PeerIdentity *) &msg[1];
2110 for (i = 0; i < p->length; i++)
2112 GNUNET_PEER_resolve (p->peers[i], peer_ptr++);
2115 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2116 "CONNECTION CREATE (%u bytes long) sent!\n", size_needed);
2122 * Creates a path ack message in buf and frees all unused resources.
2124 * @param c Connection to send an ACK on.
2125 * @param size number of bytes available in buf
2126 * @param buf where the callee should write the message
2128 * @return number of bytes written to buf
2131 send_core_connection_ack (struct MeshConnection *c, size_t size, void *buf)
2133 struct GNUNET_MESH_ConnectionACK *msg = buf;
2134 struct MeshTunnel2 *t = c->t;
2136 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Sending CONNECTION ACK...\n");
2137 GNUNET_assert (NULL != t);
2138 if (sizeof (struct GNUNET_MESH_ConnectionACK) > size)
2143 msg->header.size = htons (sizeof (struct GNUNET_MESH_ConnectionACK));
2144 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CONNECTION_ACK);
2148 /* TODO add signature */
2150 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "CONNECTION ACK sent!\n");
2151 return sizeof (struct GNUNET_MESH_ConnectionACK);
2156 * Destroy the peer_info and free any allocated resources linked to it
2158 * @param peer The peer_info to destroy.
2160 * @return GNUNET_OK on success
2163 peer_destroy (struct MeshPeer *peer)
2165 struct GNUNET_PeerIdentity id;
2166 struct MeshPeerPath *p;
2167 struct MeshPeerPath *nextp;
2169 GNUNET_PEER_resolve (peer->id, &id);
2170 GNUNET_PEER_change_rc (peer->id, -1);
2173 GNUNET_CONTAINER_multihashmap_remove (peers, &id.hashPubKey, peer))
2176 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2177 "removing peer %s, not in hashmap\n", GNUNET_i2s (&id));
2179 if (NULL != peer->dhtget)
2181 GNUNET_DHT_get_stop (peer->dhtget);
2183 p = peer->path_head;
2187 GNUNET_CONTAINER_DLL_remove (peer->path_head, peer->path_tail, p);
2191 tunnel_destroy_empty (peer->tunnel);
2198 * Returns if peer is used (has a tunnel, is neighbor).
2200 * @peer Peer to check.
2202 * @return GNUNET_YES if peer is in use.
2205 peer_is_used (struct MeshPeer *peer)
2207 struct MeshPeerPath *p;
2209 if (NULL != peer->tunnel)
2212 for (p = peer->path_head; NULL != p; p = p->next)
2221 * Iterator over all the peers to get the oldest timestamp.
2223 * @param cls Closure (unsued).
2224 * @param key ID of the peer.
2225 * @param value Peer_Info of the peer.
2228 peer_get_oldest (void *cls,
2229 const struct GNUNET_HashCode *key,
2232 struct MeshPeer *p = value;
2233 struct GNUNET_TIME_Absolute *abs = cls;
2235 /* Don't count active peers */
2236 if (GNUNET_YES == peer_is_used (p))
2239 if (abs->abs_value_us < p->last_contact.abs_value_us)
2240 abs->abs_value_us = p->last_contact.abs_value_us;
2247 * Iterator over all the peers to remove the oldest entry.
2249 * @param cls Closure (unsued).
2250 * @param key ID of the peer.
2251 * @param value Peer_Info of the peer.
2254 peer_timeout (void *cls,
2255 const struct GNUNET_HashCode *key,
2258 struct MeshPeer *p = value;
2259 struct GNUNET_TIME_Absolute *abs = cls;
2261 if (p->last_contact.abs_value_us == abs->abs_value_us &&
2262 GNUNET_NO == peer_is_used (p))
2272 * Delete oldest unused peer.
2275 peer_delete_oldest (void)
2277 struct GNUNET_TIME_Absolute abs;
2279 abs = GNUNET_TIME_UNIT_FOREVER_ABS;
2281 GNUNET_CONTAINER_multihashmap_iterate (peers,
2284 GNUNET_CONTAINER_multihashmap_iterate (peers,
2291 * Retrieve the MeshPeer stucture associated with the peer, create one
2292 * and insert it in the appropriate structures if the peer is not known yet.
2294 * @param peer Full identity of the peer.
2296 * @return Existing or newly created peer info.
2298 static struct MeshPeer *
2299 peer_get (const struct GNUNET_PeerIdentity *peer_id)
2301 struct MeshPeer *peer;
2303 peer = GNUNET_CONTAINER_multihashmap_get (peers, &peer_id->hashPubKey);
2306 peer = GNUNET_new (struct MeshPeer);
2307 if (GNUNET_CONTAINER_multihashmap_size (peers) > max_peers)
2309 peer_delete_oldest ();
2311 GNUNET_CONTAINER_multihashmap_put (peers, &peer_id->hashPubKey, peer,
2312 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST);
2313 peer->id = GNUNET_PEER_intern (peer_id);
2315 peer->last_contact = GNUNET_TIME_absolute_get();
2322 * Retrieve the MeshPeer stucture associated with the peer, create one
2323 * and insert it in the appropriate structures if the peer is not known yet.
2325 * @param peer Short identity of the peer.
2327 * @return Existing or newly created peer info.
2329 static struct MeshPeer *
2330 peer_get_short (const GNUNET_PEER_Id peer)
2332 return peer_get (GNUNET_PEER_resolve2 (peer));
2337 * Get a cost of a path for a peer considering existing tunnel connections.
2339 * @param peer Peer towards which the path is considered.
2340 * @param path Candidate path.
2342 * @return Cost of the path (path length + number of overlapping nodes)
2345 peer_get_path_cost (const struct MeshPeer *peer,
2346 const struct MeshPeerPath *path)
2348 struct MeshConnection *c;
2349 unsigned int overlap;
2357 GNUNET_assert (NULL != peer->tunnel);
2359 for (i = 0; i < path->length; i++)
2361 for (c = peer->tunnel->connection_head; NULL != c; c = c->next)
2363 for (j = 0; j < c->path->length; j++)
2365 if (path->peers[i] == c->path->peers[j])
2373 return (path->length + overlap) * (path->score * -1);
2378 * Choose the best path towards a peer considering the tunnel properties.
2380 * @param peer The destination peer.
2382 * @return Best current known path towards the peer, if any.
2384 static struct MeshPeerPath *
2385 peer_get_best_path (const struct MeshPeer *peer)
2387 struct MeshPeerPath *best_p;
2388 struct MeshPeerPath *p;
2389 struct MeshConnection *c;
2390 unsigned int best_cost;
2393 best_cost = UINT_MAX;
2395 for (p = peer->path_head; NULL != p; p = p->next)
2397 for (c = peer->tunnel->connection_head; NULL != c; c = c->next)
2401 continue; /* If path is in use in a connection, skip it. */
2403 if ((cost = peer_get_path_cost (peer, p)) < best_cost)
2413 queue_is_sendable (struct MeshPeerQueue *q)
2415 struct MeshFlowControl *fc;
2417 /* Is PID-independent? */
2420 case GNUNET_MESSAGE_TYPE_MESH_ACK:
2421 case GNUNET_MESSAGE_TYPE_MESH_POLL:
2425 /* Is PID allowed? */
2426 fc = q->fwd ? &q->c->fwd_fc : &q->c->bck_fc;
2427 if (GMC_is_pid_bigger (fc->last_ack_recv, fc->last_pid_sent))
2435 * Get first sendable message.
2437 * @param peer The destination peer.
2439 * @return Best current known path towards the peer, if any.
2441 static struct MeshPeerQueue *
2442 peer_get_first_message (const struct MeshPeer *peer)
2444 struct MeshPeerQueue *q;
2446 for (q = peer->queue_head; NULL != q; q = q->next)
2448 if (queue_is_sendable (q))
2457 * Try to establish a new connection to this peer in the given tunnel.
2458 * If the peer doesn't have any path to it yet, try to get one.
2459 * If the peer already has some path, send a CREATE CONNECTION towards it.
2461 * @param peer PeerInfo of the peer.
2464 peer_connect (struct MeshPeer *peer)
2466 struct MeshTunnel2 *t;
2467 struct MeshPeerPath *p;
2468 struct MeshConnection *c;
2471 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2472 "peer_connect towards %s\n",
2476 rerun_dhtget = GNUNET_NO;
2478 if (NULL != peer->path_head)
2480 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "path exists\n");
2481 p = peer_get_best_path (peer);
2484 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " %u hops\n", p->length);
2485 c = tunnel_use_path (t, p);
2488 /* This case can happen when the path includes a first hop that is
2489 * not yet known to be connected.
2491 * This happens quite often during testing when running mesh
2492 * under valgrind: core connect notifications come very late and the
2493 * DHT result has already come and created a valid path.
2494 * In this case, the peer->connections hashmap will be NULL and
2495 * tunnel_use_path will not be able to create a connection from that
2498 * Re-running the DHT GET should give core time to callback.
2501 rerun_dhtget = GNUNET_YES;
2505 send_connection_create (c);
2511 if (NULL != peer->dhtget && GNUNET_YES == rerun_dhtget)
2513 GNUNET_DHT_get_stop (peer->dhtget);
2514 peer->dhtget = NULL;
2515 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2516 " Stopping DHT GET for peer %s\n", peer2s (peer));
2519 if (NULL == peer->dhtget)
2521 const struct GNUNET_PeerIdentity *id;
2523 id = GNUNET_PEER_resolve2 (peer->id);
2524 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2525 " Starting DHT GET for peer %s\n", peer2s (peer));
2526 peer->dhtget = GNUNET_DHT_get_start (dht_handle, /* handle */
2527 GNUNET_BLOCK_TYPE_MESH_PEER, /* type */
2528 &id->hashPubKey, /* key to search */
2529 dht_replication_level, /* replication level */
2530 GNUNET_DHT_RO_RECORD_ROUTE |
2531 GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE,
2533 0, /* xquery bits */
2534 &dht_get_id_handler, peer);
2535 if (MESH_TUNNEL_NEW == t->state)
2536 tunnel_change_state (t, MESH_TUNNEL_SEARCHING);
2542 * Get the first transmittable message for a connection.
2544 * @param c Connection.
2545 * @param fwd Is this FWD?
2547 * @return First transmittable message.
2549 static struct MeshPeerQueue *
2550 connection_get_first_message (struct MeshConnection *c, int fwd)
2552 struct MeshPeerQueue *q;
2555 p = connection_get_hop (c, fwd);
2557 for (q = p->queue_head; NULL != q; q = q->next)
2561 if (queue_is_sendable (q))
2570 * @brief Re-initiate traffic on this connection if necessary.
2572 * Check if there is traffic queued towards this peer
2573 * and the core transmit handle is NULL (traffic was stalled).
2574 * If so, call core tmt rdy.
2576 * @param c Connection on which initiate traffic.
2577 * @param fwd Is this about fwd traffic?
2580 connection_unlock_queue (struct MeshConnection *c, int fwd)
2582 struct MeshPeer *peer;
2583 struct MeshPeerQueue *q;
2586 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2587 "connection_unlock_queue %s on %s\n",
2588 fwd ? "FWD" : "BCK", GNUNET_h2s (&c->id));
2590 if (connection_is_origin (c, fwd))
2592 struct MeshTunnel2 *t = c->t;
2593 struct MeshChannel *ch;
2594 struct MeshChannelReliability *rel;
2596 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " is origin!\n");
2597 /* FIXME randomize channel selection, not always first channel */
2598 for (ch = t->channel_head; NULL != ch; ch = ch->next)
2600 rel = fwd ? ch->root_rel : ch->dest_rel;
2602 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " channel %X - %s\n",
2603 ch->gid, rel->client_ready ? "ready " : "not ready");
2604 if (GNUNET_NO == rel->client_ready)
2606 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " sending local ack!\n");
2607 send_local_ack (ch, fwd);
2608 return; /* FIXME authorize all channels? */
2614 peer = connection_get_hop (c, fwd);
2616 if (NULL != peer->core_transmit)
2618 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " already unlocked!\n");
2619 return; /* Already unlocked */
2622 q = connection_get_first_message (c, fwd);
2625 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " queue empty!\n");
2626 return; /* Nothing to transmit */
2630 peer->core_transmit =
2631 GNUNET_CORE_notify_transmit_ready (core_handle,
2634 GNUNET_TIME_UNIT_FOREVER_REL,
2635 GNUNET_PEER_resolve2 (peer->id),
2643 * Cancel all transmissions that belong to a certain connection.
2645 * @param c Connection which to cancel.
2646 * @param fwd Cancel fwd traffic?
2649 connection_cancel_queues (struct MeshConnection *c, int fwd)
2651 struct MeshPeerQueue *q;
2652 struct MeshPeerQueue *next;
2653 struct MeshFlowControl *fc;
2654 struct MeshPeer *peer;
2661 fc = fwd ? &c->fwd_fc : &c->bck_fc;
2662 peer = connection_get_hop (c, fwd);
2664 for (q = peer->queue_head; NULL != q; q = next)
2669 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2670 "connection_cancel_queue %s\n",
2671 GNUNET_MESH_DEBUG_M2S (q->type));
2672 queue_destroy (q, GNUNET_YES);
2675 if (NULL == peer->queue_head)
2677 if (NULL != peer->core_transmit)
2679 GNUNET_CORE_notify_transmit_ready_cancel (peer->core_transmit);
2680 peer->core_transmit = NULL;
2682 if (GNUNET_SCHEDULER_NO_TASK != fc->poll_task)
2684 GNUNET_SCHEDULER_cancel (fc->poll_task);
2685 fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
2692 * Remove all paths that rely on a direct connection between p1 and p2
2693 * from the peer itself and notify all tunnels about it.
2695 * @param peer PeerInfo of affected peer.
2696 * @param p1 GNUNET_PEER_Id of one peer.
2697 * @param p2 GNUNET_PEER_Id of another peer that was connected to the first and
2700 * FIXME use peer->connections!!!
2703 peer_remove_path (struct MeshPeer *peer, GNUNET_PEER_Id p1,
2706 struct MeshPeerPath *p;
2707 struct MeshPeerPath *next;
2708 struct MeshPeer *peer_d;
2710 unsigned int destroyed;
2713 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "peer_info_remove_path\n");
2715 for (p = peer->path_head; NULL != p; p = next)
2718 for (i = 0; i < (p->length - 1); i++)
2720 if ((p->peers[i] == p1 && p->peers[i + 1] == p2) ||
2721 (p->peers[i] == p2 && p->peers[i + 1] == p1))
2723 GNUNET_CONTAINER_DLL_remove (peer->path_head, peer->path_tail, p);
2733 d = tunnel_notify_connection_broken (peer->tunnel, p1, p2);
2735 peer_d = peer_get_short (d); // FIXME
2736 next = peer_get_best_path (peer_d);
2737 tunnel_use_path (peer->tunnel, next);
2738 peer_connect (peer_d);
2740 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "peer_info_remove_path END\n");
2745 * Add the path to the peer and update the path used to reach it in case this
2748 * @param peer_info Destination peer to add the path to.
2749 * @param path New path to add. Last peer must be the peer in arg 1.
2750 * Path will be either used of freed if already known.
2751 * @param trusted Do we trust that this path is real?
2754 peer_add_path (struct MeshPeer *peer_info, struct MeshPeerPath *path,
2757 struct MeshPeerPath *aux;
2761 if ((NULL == peer_info) || (NULL == path))
2764 path_destroy (path);
2767 if (path->peers[path->length - 1] != peer_info->id)
2770 path_destroy (path);
2773 if (2 >= path->length && GNUNET_NO == trusted)
2775 /* Only allow CORE to tell us about direct paths */
2776 path_destroy (path);
2779 for (l = 1; l < path->length; l++)
2781 if (path->peers[l] == myid)
2783 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "shortening path by %u\n", l);
2784 for (l2 = 0; l2 < path->length - l; l2++)
2786 path->peers[l2] = path->peers[l + l2];
2791 GNUNET_realloc (path->peers, path->length * sizeof (GNUNET_PEER_Id));
2795 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "adding path [%u] to peer %s\n",
2796 path->length, peer2s (peer_info));
2798 l = path_get_length (path);
2801 path_destroy (path);
2805 GNUNET_assert (peer_info->id == path->peers[path->length - 1]);
2806 for (aux = peer_info->path_head; aux != NULL; aux = aux->next)
2808 l2 = path_get_length (aux);
2811 GNUNET_CONTAINER_DLL_insert_before (peer_info->path_head,
2812 peer_info->path_tail, aux, path);
2817 if (l2 == l && memcmp (path->peers, aux->peers, l) == 0)
2819 path_destroy (path);
2824 GNUNET_CONTAINER_DLL_insert_tail (peer_info->path_head, peer_info->path_tail,
2831 * Add the path to the origin peer and update the path used to reach it in case
2832 * this is the shortest.
2833 * The path is given in peer_info -> destination, therefore we turn the path
2834 * upside down first.
2836 * @param peer_info Peer to add the path to, being the origin of the path.
2837 * @param path New path to add after being inversed.
2838 * Path will be either used or freed.
2839 * @param trusted Do we trust that this path is real?
2842 peer_add_path_to_origin (struct MeshPeer *peer_info,
2843 struct MeshPeerPath *path, int trusted)
2848 peer_add_path (peer_info, path, trusted);
2854 * Function called if a connection has been stalled for a while,
2855 * possibly due to a missed ACK. Poll the neighbor about its ACK status.
2857 * @param cls Closure (poll ctx).
2858 * @param tc TaskContext.
2861 connection_poll (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
2863 struct MeshFlowControl *fc = cls;
2864 struct GNUNET_MESH_Poll msg;
2865 struct MeshConnection *c;
2867 fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
2868 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
2874 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " *** Polling!\n");
2875 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " *** connection %s[%X]\n",
2876 peer2s (c->t->peer), c->id);
2877 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " *** %s\n",
2878 fc == &c->fwd_fc ? "FWD" : "BCK");
2880 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_POLL);
2881 msg.header.size = htons (sizeof (msg));
2882 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " *** pid (%u)!\n", fc->last_pid_sent);
2883 send_prebuilt_message_connection (&msg.header, c, NULL, fc == &c->fwd_fc);
2884 fc->poll_time = GNUNET_TIME_STD_BACKOFF (fc->poll_time);
2885 fc->poll_task = GNUNET_SCHEDULER_add_delayed (fc->poll_time,
2886 &connection_poll, fc);
2891 * Build a PeerPath from the paths returned from the DHT, reversing the paths
2892 * to obtain a local peer -> destination path and interning the peer ids.
2894 * @return Newly allocated and created path
2896 static struct MeshPeerPath *
2897 path_build_from_dht (const struct GNUNET_PeerIdentity *get_path,
2898 unsigned int get_path_length,
2899 const struct GNUNET_PeerIdentity *put_path,
2900 unsigned int put_path_length)
2902 struct MeshPeerPath *p;
2908 GNUNET_PEER_change_rc (myid, 1);
2909 i = get_path_length;
2910 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " GET has %d hops.\n", i);
2911 for (i--; i >= 0; i--)
2913 id = GNUNET_PEER_intern (&get_path[i]);
2914 if (p->length > 0 && id == p->peers[p->length - 1])
2916 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Optimizing 1 hop out.\n");
2917 GNUNET_PEER_change_rc (id, -1);
2921 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Adding from GET: %s.\n",
2922 GNUNET_i2s (&get_path[i]));
2924 p->peers = GNUNET_realloc (p->peers, sizeof (GNUNET_PEER_Id) * p->length);
2925 p->peers[p->length - 1] = id;
2928 i = put_path_length;
2929 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " PUT has %d hops.\n", i);
2930 for (i--; i >= 0; i--)
2932 id = GNUNET_PEER_intern (&put_path[i]);
2935 /* PUT path went through us, so discard the path up until now and start
2936 * from here to get a much shorter (and loop-free) path.
2941 if (p->length > 0 && id == p->peers[p->length - 1])
2943 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Optimizing 1 hop out.\n");
2944 GNUNET_PEER_change_rc (id, -1);
2948 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Adding from PUT: %s.\n",
2949 GNUNET_i2s (&put_path[i]));
2951 p->peers = GNUNET_realloc (p->peers, sizeof (GNUNET_PEER_Id) * p->length);
2952 p->peers[p->length - 1] = id;
2956 if (get_path_length > 0)
2957 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " (first of GET: %s)\n",
2958 GNUNET_i2s (&get_path[0]));
2959 if (put_path_length > 0)
2960 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " (first of PUT: %s)\n",
2961 GNUNET_i2s (&put_path[0]));
2962 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " In total: %d hops\n",
2964 for (i = 0; i < p->length; i++)
2966 struct GNUNET_PeerIdentity peer_id;
2968 GNUNET_PEER_resolve (p->peers[i], &peer_id);
2969 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " %u: %s\n", p->peers[i],
2970 GNUNET_i2s (&peer_id));
2978 * Adds a path to the peer_infos of all the peers in the path
2980 * @param p Path to process.
2981 * @param confirmed Whether we know if the path works or not.
2984 path_add_to_peers (struct MeshPeerPath *p, int confirmed)
2988 /* TODO: invert and add */
2989 for (i = 0; i < p->length && p->peers[i] != myid; i++) /* skip'em */ ;
2990 for (i++; i < p->length; i++)
2992 struct MeshPeer *aux;
2993 struct MeshPeerPath *copy;
2995 aux = peer_get_short (p->peers[i]);
2996 copy = path_duplicate (p);
2997 copy->length = i + 1;
2998 peer_add_path (aux, copy, p->length < 3 ? GNUNET_NO : confirmed);
3004 * Search for a channel among the channels for a client
3006 * @param c the client whose channels to search in
3007 * @param chid the local id of the channel
3009 * @return channel handler, NULL if doesn't exist
3011 static struct MeshChannel *
3012 channel_get_by_local_id (struct MeshClient *c, MESH_ChannelNumber chid)
3014 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " -- get CHID %X\n", chid);
3015 if (0 == (chid & GNUNET_MESH_LOCAL_CHANNEL_ID_CLI))
3017 GNUNET_break_op (0);
3018 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "CHID %X not a local chid\n", chid);
3021 if (chid >= GNUNET_MESH_LOCAL_CHANNEL_ID_SERV)
3022 return GNUNET_CONTAINER_multihashmap32_get (c->incoming_channels, chid);
3023 return GNUNET_CONTAINER_multihashmap32_get (c->own_channels, chid);
3029 channel_debug (struct MeshChannel *ch)
3033 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "*** DEBUG NULL CHANNEL ***\n");
3036 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Channel %s:%X\n",
3037 peer2s (ch->t->peer), ch->gid);
3038 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " root %p/%p\n",
3039 ch->root, ch->root_rel);
3040 if (NULL != ch->root)
3042 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " cli %u\n", ch->root->id);
3043 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ready %s\n",
3044 ch->root_rel->client_ready ? "YES" : "NO");
3045 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " id %X\n", ch->lid_root);
3047 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " root %p/%p\n",
3048 ch->dest, ch->dest_rel);
3049 if (NULL != ch->dest)
3051 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " cli %u\n", ch->dest->id);
3052 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ready %s\n",
3053 ch->dest_rel->client_ready ? "YES" : "NO");
3054 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " id %X\n", ch->lid_dest);
3059 fc_debug (struct MeshFlowControl *fc)
3061 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " IN: %u/%u\n",
3062 fc->last_pid_recv, fc->last_ack_sent);
3063 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " OUT: %u/%u\n",
3064 fc->last_pid_sent, fc->last_ack_recv);
3065 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " QUEUE: %u/%u\n",
3066 fc->queue_n, fc->queue_max);
3070 connection_debug (struct MeshConnection *c)
3074 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "*** DEBUG NULL CONNECTION ***\n");
3077 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Connection %s:%X\n",
3078 peer2s (c->t->peer), GNUNET_h2s (&c->id));
3079 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " state: %u, pending msgs: %u\n",
3080 c->state, c->pending_messages);
3081 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " FWD FC\n");
3082 fc_debug (&c->fwd_fc);
3083 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " BCK FC\n");
3084 fc_debug (&c->bck_fc);
3089 static struct MeshChannel *
3090 channel_get (struct MeshTunnel2 *t, MESH_ChannelNumber chid)
3092 struct MeshChannel *ch;
3097 for (ch = t->channel_head; NULL != ch; ch = ch->next)
3099 if (ch->gid == chid)
3108 * Change the tunnel state.
3110 * @param t Tunnel whose state to change.
3111 * @param state New state.
3114 tunnel_change_state (struct MeshTunnel2* t, enum MeshTunnelState state)
3118 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3119 "Tunnel %s state was %s\n",
3121 GNUNET_MESH_DEBUG_TS2S (t->state));
3122 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3123 "Tunnel %s state is now %s\n",
3125 GNUNET_MESH_DEBUG_TS2S (state));
3131 * Cache a message to be sent once tunnel is online.
3133 * @param t Tunnel to hold the message.
3134 * @param ch Channel the message is about.
3135 * @param msg Message itself (copy will be made).
3136 * @param fwd Is this fwd?
3139 tunnel_queue_data (struct MeshTunnel2 *t,
3140 struct MeshChannel *ch,
3141 struct GNUNET_MessageHeader *msg,
3144 struct MeshTunnelQueue *tq;
3145 uint16_t size = ntohs (msg->size);
3147 tq = GNUNET_malloc (sizeof (struct MeshTunnelQueue) + size);
3150 memcpy (&tq[1], msg, size);
3151 GNUNET_CONTAINER_DLL_insert_tail (t->tq_head, t->tq_tail, tq);
3156 * Send all cached messages that we can, tunnel is online.
3158 * @param t Tunnel that holds the messages.
3159 * @param fwd Is this fwd?
3162 tunnel_send_queued_data (struct MeshTunnel2 *t, int fwd)
3164 struct MeshTunnelQueue *tq;
3165 struct MeshTunnelQueue *next;
3168 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3169 "tunnel_send_queued_data on tunnel %s\n",
3171 room = tunnel_get_buffer (t, fwd);
3172 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " buffer space: %u\n", room);
3173 for (tq = t->tq_head; NULL != tq && room > 0; tq = next)
3177 GNUNET_CONTAINER_DLL_remove (t->tq_head, t->tq_tail, tq);
3178 send_prebuilt_message_channel ((struct GNUNET_MessageHeader *) &tq[1],
3187 connection_change_state (struct MeshConnection* c,
3188 enum MeshConnectionState state)
3190 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3191 "Connection %s state was %s\n",
3192 GNUNET_h2s (&c->id), GNUNET_MESH_DEBUG_CS2S (c->state));
3193 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3194 "Connection %s state is now %s\n",
3195 GNUNET_h2s (&c->id), GNUNET_MESH_DEBUG_CS2S (state));
3201 * Add a client to a channel, initializing all needed data structures.
3203 * @param ch Channel to which add the client.
3204 * @param c Client which to add to the channel.
3207 channel_add_client (struct MeshChannel *ch, struct MeshClient *c)
3209 struct MeshTunnel2 *t = ch->t;
3211 if (NULL != ch->dest)
3217 /* Assign local id as destination */
3218 while (NULL != channel_get_by_local_id (c, t->next_local_chid))
3219 t->next_local_chid = (t->next_local_chid + 1) | GNUNET_MESH_LOCAL_CHANNEL_ID_SERV;
3220 ch->lid_dest = t->next_local_chid++;
3221 t->next_local_chid = t->next_local_chid | GNUNET_MESH_LOCAL_CHANNEL_ID_SERV;
3223 /* Store in client's hashmap */
3225 GNUNET_CONTAINER_multihashmap32_put (c->incoming_channels,
3227 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST))
3233 GNUNET_break (NULL == ch->dest_rel);
3234 ch->dest_rel = GNUNET_new (struct MeshChannelReliability);
3235 ch->dest_rel->ch = ch;
3236 ch->dest_rel->expected_delay = MESH_RETRANSMIT_TIME;
3242 static struct MeshConnection *
3243 tunnel_use_path (struct MeshTunnel2 *t, struct MeshPeerPath *p)
3245 struct MeshConnection *c;
3246 struct GNUNET_HashCode cid;
3247 struct MeshPeer *peer;
3248 unsigned int own_pos;
3250 GNUNET_CRYPTO_hash_create_random (GNUNET_CRYPTO_QUALITY_NONCE, &cid);
3252 c = connection_new (&cid);
3254 GNUNET_CONTAINER_DLL_insert (t->connection_head, t->connection_tail, c);
3255 for (own_pos = 0; own_pos < p->length; own_pos++)
3257 if (p->peers[own_pos] == myid)
3260 if (own_pos > p->length - 1)
3263 connection_destroy (c);
3266 c->own_pos = own_pos;
3271 c->fwd_maintenance_task =
3272 GNUNET_SCHEDULER_add_delayed (refresh_connection_time,
3273 &connection_fwd_keepalive, c);
3276 peer = connection_get_next_hop (c);
3277 if (NULL == peer->connections)
3279 connection_destroy (c);
3282 GNUNET_CONTAINER_multihashmap_put (peer->connections, &c->id, c,
3283 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST);
3284 peer = connection_get_prev_hop (c);
3285 if (NULL == peer->connections)
3287 connection_destroy (c);
3290 GNUNET_CONTAINER_multihashmap_put (peer->connections, &c->id, c,
3291 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST);
3297 * Notifies a tunnel that a connection has broken that affects at least
3298 * some of its peers. Sends a notification towards the root of the tree.
3299 * In case the peer is the owner of the tree, notifies the client that owns
3300 * the tunnel and tries to reconnect.
3302 * FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME
3304 * @param t Tunnel affected.
3305 * @param p1 Peer that got disconnected from p2.
3306 * @param p2 Peer that got disconnected from p1.
3308 * @return Short ID of the peer disconnected (either p1 or p2).
3309 * 0 if the tunnel remained unaffected.
3311 static GNUNET_PEER_Id
3312 tunnel_notify_connection_broken (struct MeshTunnel2* t,
3313 GNUNET_PEER_Id p1, GNUNET_PEER_Id p2)
3315 // if (myid != p1 && myid != p2) FIXME
3320 // if (tree_get_predecessor (t->tree) != 0)
3322 // /* We are the peer still connected, notify owner of the disconnection. */
3323 // struct GNUNET_MESH_PathBroken msg;
3324 // struct GNUNET_PeerIdentity neighbor;
3326 // msg.header.size = htons (sizeof (msg));
3327 // msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_BROKEN);
3328 // GNUNET_PEER_resolve (t->id.oid, &msg.oid);
3329 // msg.tid = htonl (t->id.tid);
3330 // msg.peer1 = my_full_id;
3331 // GNUNET_PEER_resolve (pid, &msg.peer2);
3332 // GNUNET_PEER_resolve (tree_get_predecessor (t->tree), &neighbor);
3333 // send_prebuilt_message (&msg.header, &neighbor, t);
3340 * Send an end-to-end ACK message for the most recent in-sequence payload.
3342 * If channel is not reliable, do nothing.
3344 * @param ch Channel this is about.
3345 * @param fwd Is for FWD traffic? (ACK dest->owner)
3348 channel_send_data_ack (struct MeshChannel *ch, int fwd)
3350 struct GNUNET_MESH_DataACK msg;
3351 struct MeshChannelReliability *rel;
3352 struct MeshReliableMessage *copy;
3357 if (GNUNET_NO == ch->reliable)
3361 rel = fwd ? ch->dest_rel : ch->root_rel;
3362 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3363 "send_data_ack for %u\n",
3366 type = GNUNET_MESSAGE_TYPE_MESH_DATA_ACK;
3367 msg.header.type = htons (type);
3368 msg.header.size = htons (sizeof (msg));
3369 msg.chid = htonl (ch->gid);
3370 msg.mid = htonl (rel->mid_recv - 1);
3372 for (copy = rel->head_recv; NULL != copy; copy = copy->next)
3374 if (copy->type != type)
3376 delta = copy->mid - rel->mid_recv;
3379 mask = 0x1LL << delta;
3380 msg.futures |= mask;
3381 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3382 " setting bit for %u (delta %u) (%llX) -> %llX\n",
3383 copy->mid, delta, mask, msg.futures);
3385 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " final futures %llX\n", msg.futures);
3387 send_prebuilt_message_channel (&msg.header, ch, fwd);
3388 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "send_data_ack END\n");
3393 * Send an ACK informing the predecessor about the available buffer space.
3395 * Note that for fwd ack, the FWD mean forward *traffic* (root->dest),
3396 * the ACK itself goes "back" (dest->root).
3398 * @param c Connection on which to send the ACK.
3399 * @param buffer How much space free to advertise?
3400 * @param fwd Is this FWD ACK? (Going dest->owner)
3403 connection_send_ack (struct MeshConnection *c, unsigned int buffer, int fwd)
3405 struct MeshFlowControl *next_fc;
3406 struct MeshFlowControl *prev_fc;
3407 struct GNUNET_MESH_ACK msg;
3411 next_fc = fwd ? &c->fwd_fc : &c->bck_fc;
3412 prev_fc = fwd ? &c->bck_fc : &c->fwd_fc;
3414 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3415 "connection send %s ack on %s\n",
3416 fwd ? "FWD" : "BCK", GNUNET_h2s (&c->id));
3418 /* Check if we need to transmit the ACK */
3419 if (prev_fc->last_ack_sent - prev_fc->last_pid_recv > 3)
3421 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Not sending ACK, buffer > 3\n");
3422 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3423 " last pid recv: %u, last ack sent: %u\n",
3424 prev_fc->last_pid_recv, prev_fc->last_ack_sent);
3428 /* Ok, ACK might be necessary, what PID to ACK? */
3429 delta = next_fc->queue_max - next_fc->queue_n;
3430 ack = prev_fc->last_pid_recv + delta;
3431 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ACK %u\n", ack);
3432 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3433 " last pid %u, last ack %u, qmax %u, q %u\n",
3434 prev_fc->last_pid_recv, prev_fc->last_ack_sent,
3435 next_fc->queue_max, next_fc->queue_n);
3436 if (ack == prev_fc->last_ack_sent)
3438 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Not sending FWD ACK, not needed\n");
3442 prev_fc->last_ack_sent = ack;
3444 /* Build ACK message and send on connection */
3445 msg.header.size = htons (sizeof (msg));
3446 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_ACK);
3447 msg.ack = htonl (ack);
3450 send_prebuilt_message_connection (&msg.header, c, NULL, !fwd);
3455 * Modify the mesh message TID from global to local and send to client.
3457 * @param ch Channel on which to send the message.
3458 * @param msg Message to modify and send.
3459 * @param c Client to send to.
3460 * @param tid Tunnel ID to use (c can be both owner and client).
3463 channel_send_client_to_tid (struct MeshChannel *ch,
3464 const struct GNUNET_MESH_Data *msg,
3465 struct MeshClient *c, MESH_ChannelNumber id)
3467 struct GNUNET_MESH_LocalData *copy;
3468 uint16_t size = ntohs (msg->header.size) - sizeof (struct GNUNET_MESH_Data);
3469 char cbuf[size + sizeof (struct GNUNET_MESH_LocalData)];
3471 if (size < sizeof (struct GNUNET_MessageHeader))
3473 GNUNET_break_op (0);
3481 copy = (struct GNUNET_MESH_LocalData *) cbuf;
3482 memcpy (©[1], &msg[1], size);
3483 copy->header.size = htons (sizeof (struct GNUNET_MESH_LocalData) + size);
3484 copy->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_DATA);
3485 copy->id = htonl (id);
3486 GNUNET_SERVER_notification_context_unicast (nc, c->handle,
3487 ©->header, GNUNET_NO);
3492 * We have received a message out of order, or the client is not ready.
3493 * Buffer it until we receive an ACK from the client or the missing
3494 * message from the channel.
3496 * @param msg Message to buffer (MUST be of type MESH_DATA).
3497 * @param rel Reliability data to the corresponding direction.
3500 channel_rel_add_buffered_data (const struct GNUNET_MESH_Data *msg,
3501 struct MeshChannelReliability *rel)
3503 struct MeshReliableMessage *copy;
3504 struct MeshReliableMessage *prev;
3508 size = ntohs (msg->header.size);
3509 mid = ntohl (msg->mid);
3511 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "add_buffered_data %u\n", mid);
3513 copy = GNUNET_malloc (sizeof (*copy) + size);
3516 memcpy (©[1], msg, size);
3520 // FIXME do something better than O(n), although n < 64...
3521 // FIXME start from the end (most messages are the latest ones)
3522 for (prev = rel->head_recv; NULL != prev; prev = prev->next)
3524 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " prev %u\n", prev->mid);
3525 if (GMC_is_pid_bigger (prev->mid, mid))
3527 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " bingo!\n");
3528 GNUNET_CONTAINER_DLL_insert_before (rel->head_recv, rel->tail_recv,
3533 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " insert at tail!\n");
3534 GNUNET_CONTAINER_DLL_insert_tail (rel->head_recv, rel->tail_recv, copy);
3535 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "add_buffered_data END\n");
3540 channel_send_client_data (struct MeshChannel *ch,
3541 const struct GNUNET_MESH_Data *msg,
3546 if (ch->dest_rel->client_ready)
3547 channel_send_client_to_tid (ch, msg, ch->dest, ch->lid_dest);
3549 channel_rel_add_buffered_data (msg, ch->dest_rel);
3553 if (ch->root_rel->client_ready)
3554 channel_send_client_to_tid (ch, msg, ch->root, ch->lid_root);
3556 channel_rel_add_buffered_data (msg, ch->root_rel);
3562 * Send a buffered message to the client, for in order delivery or
3563 * as result of client ACK.
3565 * @param ch Channel on which to empty the message buffer.
3566 * @param c Client to send to.
3567 * @param rel Reliability structure to corresponding peer.
3568 * If rel == bck_rel, this is FWD data.
3571 channel_send_client_buffered_data (struct MeshChannel *ch,
3572 struct MeshClient *c,
3575 struct MeshReliableMessage *copy;
3576 struct MeshChannelReliability *rel;
3578 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "send_buffered_data\n");
3579 rel = fwd ? ch->dest_rel : ch->root_rel;
3580 if (GNUNET_NO == rel->client_ready)
3582 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "client not ready\n");
3586 copy = rel->head_recv;
3587 /* We never buffer channel management messages */
3590 if (copy->mid == rel->mid_recv || GNUNET_NO == ch->reliable)
3592 struct GNUNET_MESH_Data *msg = (struct GNUNET_MESH_Data *) ©[1];
3594 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3595 " have %u! now expecting %u\n",
3596 copy->mid, rel->mid_recv + 1);
3597 channel_send_client_data (ch, msg, fwd);
3600 GNUNET_CONTAINER_DLL_remove (rel->head_recv, rel->tail_recv, copy);
3605 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3606 " reliable && don't have %u, next is %u\n",
3612 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "send_buffered_data END\n");
3617 * Destroy a reliable message after it has been acknowledged, either by
3618 * direct mid ACK or bitfield. Updates the appropriate data structures and
3619 * timers and frees all memory.
3621 * @param copy Message that is no longer needed: remote peer got it.
3624 rel_message_free (struct MeshReliableMessage *copy)
3626 struct MeshChannelReliability *rel;
3627 struct GNUNET_TIME_Relative time;
3630 time = GNUNET_TIME_absolute_get_duration (copy->timestamp);
3631 rel->expected_delay.rel_value_us *= 7;
3632 rel->expected_delay.rel_value_us += time.rel_value_us;
3633 rel->expected_delay.rel_value_us /= 8;
3635 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! Freeing %u\n", copy->mid);
3636 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " n_sent %u\n", rel->n_sent);
3637 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! took %s\n",
3638 GNUNET_STRINGS_relative_time_to_string (time, GNUNET_NO));
3639 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! new expected delay %s\n",
3640 GNUNET_STRINGS_relative_time_to_string (rel->expected_delay,
3642 rel->retry_timer = rel->expected_delay;
3643 GNUNET_CONTAINER_DLL_remove (rel->head_sent, rel->tail_sent, copy);
3649 * Destroy all reliable messages queued for a channel,
3650 * during a channel destruction.
3651 * Frees the reliability structure itself.
3653 * @param rel Reliability data for a channel.
3656 channel_rel_free_all (struct MeshChannelReliability *rel)
3658 struct MeshReliableMessage *copy;
3659 struct MeshReliableMessage *next;
3664 for (copy = rel->head_recv; NULL != copy; copy = next)
3667 GNUNET_CONTAINER_DLL_remove (rel->head_recv, rel->tail_recv, copy);
3670 for (copy = rel->head_sent; NULL != copy; copy = next)
3673 GNUNET_CONTAINER_DLL_remove (rel->head_sent, rel->tail_sent, copy);
3676 if (GNUNET_SCHEDULER_NO_TASK != rel->retry_task)
3677 GNUNET_SCHEDULER_cancel (rel->retry_task);
3683 * Mark future messages as ACK'd.
3685 * @param rel Reliability data.
3686 * @param msg DataACK message with a bitfield of future ACK'd messages.
3689 channel_rel_free_sent (struct MeshChannelReliability *rel,
3690 const struct GNUNET_MESH_DataACK *msg)
3692 struct MeshReliableMessage *copy;
3693 struct MeshReliableMessage *next;
3700 bitfield = msg->futures;
3701 mid = ntohl (msg->mid);
3702 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3703 "free_sent_reliable %u %llX\n",
3705 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3706 " rel %p, head %p\n",
3707 rel, rel->head_sent);
3708 for (i = 0, copy = rel->head_sent;
3709 i < 64 && NULL != copy && 0 != bitfield;
3712 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3713 " trying bit %u (mid %u)\n",
3716 if (0 == (bitfield & mask))
3719 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " set!\n");
3720 /* Bit was set, clear the bit from the bitfield */
3723 /* The i-th bit was set. Do we have that copy? */
3724 /* Skip copies with mid < target */
3725 target = mid + i + 1;
3726 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " target %u\n", target);
3727 while (NULL != copy && GMC_is_pid_bigger (target, copy->mid))
3730 /* Did we run out of copies? (previously freed, it's ok) */
3733 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "run out of copies...\n");
3737 /* Did we overshoot the target? (previously freed, it's ok) */
3738 if (GMC_is_pid_bigger (copy->mid, target))
3740 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " next copy %u\n", copy->mid);
3744 /* Now copy->mid == target, free it */
3746 rel_message_free (copy);
3749 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "free_sent_reliable END\n");
3754 * We haven't received an ACK after a certain time: restransmit the message.
3756 * @param cls Closure (MeshReliableMessage with the message to restransmit)
3757 * @param tc TaskContext.
3760 channel_retransmit_message (void *cls,
3761 const struct GNUNET_SCHEDULER_TaskContext *tc)
3763 struct MeshChannelReliability *rel = cls;
3764 struct MeshReliableMessage *copy;
3765 struct MeshPeerQueue *q;
3766 struct MeshChannel *ch;
3767 struct MeshConnection *c;
3768 struct GNUNET_MESH_Data *payload;
3769 struct MeshPeer *hop;
3772 rel->retry_task = GNUNET_SCHEDULER_NO_TASK;
3773 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
3777 copy = rel->head_sent;
3784 /* Search the message to be retransmitted in the outgoing queue.
3785 * Check only the queue for the connection that is going to be used,
3786 * if the message is stuck in some other connection's queue we shouldn't
3788 * - cancelling it and sending the new one doesn't guarantee it's delivery,
3789 * the old connection could be temporary stalled or the queue happened to
3790 * be long at time of insertion.
3791 * - not sending the new one could cause terrible delays the old connection
3794 payload = (struct GNUNET_MESH_Data *) ©[1];
3795 fwd = (rel == ch->root_rel);
3796 c = tunnel_get_connection (ch->t, fwd);
3797 hop = connection_get_hop (c, fwd);
3798 for (q = hop->queue_head; NULL != q; q = q->next)
3800 if (ntohs (payload->header.type) == q->type && ch == q->ch)
3802 struct GNUNET_MESH_Data *queued_data = q->cls;
3804 if (queued_data->mid == payload->mid)
3809 /* Message not found in the queue that we are going to use. */
3812 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! RETRANSMIT %u\n", copy->mid);
3814 send_prebuilt_message_channel (&payload->header, ch, fwd);
3815 GNUNET_STATISTICS_update (stats, "# data retransmitted", 1, GNUNET_NO);
3819 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! ALREADY IN QUEUE %u\n", copy->mid);
3822 rel->retry_timer = GNUNET_TIME_STD_BACKOFF (rel->retry_timer);
3823 rel->retry_task = GNUNET_SCHEDULER_add_delayed (rel->retry_timer,
3824 &channel_retransmit_message,
3830 * Send ACK on one or more connections due to buffer space to the client.
3832 * Iterates all connections of the tunnel and sends ACKs appropriately.
3834 * @param ch Channel which has some free buffer space.
3835 * @param fwd Is this in for FWD traffic? (ACK goes dest->root)
3838 channel_send_connections_ack (struct MeshChannel *ch,
3839 unsigned int buffer,
3842 struct MeshTunnel2 *t = ch->t;
3843 struct MeshConnection *c;
3844 struct MeshFlowControl *fc;
3847 uint32_t allow_per_connection;
3850 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3851 "Channel send connection %s ack on %s:%X\n",
3852 fwd ? "FWD" : "BCK", peer2s (ch->t->peer), ch->gid);
3854 /* Count connections, how many messages are already allowed */
3855 for (cs = 0, allowed = 0, c = t->connection_head; NULL != c; c = c->next)
3857 fc = fwd ? &c->fwd_fc : &c->bck_fc;
3858 if (GMC_is_pid_bigger(fc->last_pid_recv, fc->last_ack_sent))
3863 allowed += fc->last_ack_sent - fc->last_pid_recv;
3867 /* Make sure there is no overflow */
3868 if (allowed > buffer)
3874 /* Authorize connections to send more data */
3875 to_allow = buffer - allowed;
3877 for (c = t->connection_head; NULL != c && to_allow > 0; c = c->next)
3879 allow_per_connection = to_allow/cs;
3880 to_allow -= allow_per_connection;
3882 fc = fwd ? &c->fwd_fc : &c->bck_fc;
3883 if (fc->last_ack_sent - fc->last_pid_recv > 64 / 3)
3887 connection_send_ack (c, allow_per_connection, fwd);
3890 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3891 "Channel send connection %s ack on %s:%X\n",
3892 fwd ? "FWD" : "BCK", peer2s (ch->t->peer), ch->gid);
3893 GNUNET_break (to_allow == 0);
3898 * Send an ACK on the appropriate connection/channel, depending on
3899 * the direction and the position of the peer.
3901 * @param c Which connection to send the hop-by-hop ACK.
3902 * @param ch Channel, if any.
3903 * @param fwd Is this a fwd ACK? (will go dest->root)
3906 send_ack (struct MeshConnection *c, struct MeshChannel *ch, int fwd)
3908 unsigned int buffer;
3910 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3911 "send ack %s on %p %p\n",
3912 fwd ? "FWD" : "BCK", c, ch);
3913 if (NULL == c || connection_is_terminal (c, fwd))
3915 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " getting from Channel\n");
3916 buffer = tunnel_get_buffer (NULL == c ? ch->t : c->t, fwd);
3920 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " getting from Connection\n");
3921 GNUNET_assert (NULL != c);
3922 buffer = connection_get_buffer (c, fwd);
3924 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " buffer available: %u\n", buffer);
3928 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " sending on all connections\n");
3929 GNUNET_assert (NULL != ch);
3930 channel_send_connections_ack (ch, buffer, fwd);
3932 else if (connection_is_origin (c, fwd))
3934 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " sending on channel...\n");
3937 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " really sending!\n");
3938 GNUNET_assert (NULL != ch);
3939 send_local_ack (ch, fwd);
3944 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " sending on connection\n");
3945 connection_send_ack (c, buffer, fwd);
3951 * Channel was ACK'd by remote peer, mark as ready and cancel retransmission.
3953 * @param ch Channel to mark as ready.
3954 * @param fwd Was the CREATE message sent fwd?
3957 channel_confirm (struct MeshChannel *ch, int fwd)
3959 struct MeshChannelReliability *rel;
3960 struct MeshReliableMessage *copy;
3961 struct MeshReliableMessage *next;
3963 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3964 " channel confirm %s %s:%X\n",
3965 fwd ? "FWD" : "BCK", peer2s (ch->t->peer), ch->gid);
3966 ch->state = MESH_CHANNEL_READY;
3968 rel = fwd ? ch->root_rel : ch->dest_rel;
3969 for (copy = rel->head_sent; NULL != copy; copy = next)
3971 struct GNUNET_MessageHeader *msg;
3974 msg = (struct GNUNET_MessageHeader *) ©[1];
3975 if (ntohs (msg->type) == GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE)
3977 rel_message_free (copy);
3981 if (GNUNET_NO == rel->client_ready)
3982 send_local_ack (ch, fwd);
3987 * Save a copy to retransmit in case it gets lost.
3989 * Initializes all needed callbacks and timers.
3991 * @param ch Channel this message goes on.
3992 * @param msg Message to copy.
3993 * @param fwd Is this fwd traffic?
3996 channel_save_copy (struct MeshChannel *ch,
3997 const struct GNUNET_MessageHeader *msg,
4000 struct MeshChannelReliability *rel;
4001 struct MeshReliableMessage *copy;
4006 rel = fwd ? ch->root_rel : ch->dest_rel;
4007 mid = rel->mid_send;
4008 type = ntohs (msg->type);
4009 size = ntohs (msg->size);
4011 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! SAVE %u\n", mid);
4012 copy = GNUNET_malloc (sizeof (struct MeshReliableMessage) + size);
4014 copy->timestamp = GNUNET_TIME_absolute_get ();
4017 memcpy (©[1], msg, size);
4019 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " n_sent %u\n", rel->n_sent);
4020 GNUNET_CONTAINER_DLL_insert_tail (rel->head_sent, rel->tail_sent, copy);
4021 if (GNUNET_SCHEDULER_NO_TASK == rel->retry_task)
4024 GNUNET_TIME_relative_multiply (rel->expected_delay,
4025 MESH_RETRANSMIT_MARGIN);
4027 GNUNET_SCHEDULER_add_delayed (rel->retry_timer,
4028 &channel_retransmit_message,
4035 * Send keepalive packets for a connection.
4037 * @param c Connection to keep alive..
4038 * @param fwd Is this a FWD keepalive? (owner -> dest).
4041 connection_keepalive (struct MeshConnection *c, int fwd)
4043 struct GNUNET_MESH_ConnectionKeepAlive *msg;
4044 size_t size = sizeof (struct GNUNET_MESH_ConnectionKeepAlive);
4048 type = fwd ? GNUNET_MESSAGE_TYPE_MESH_FWD_KEEPALIVE :
4049 GNUNET_MESSAGE_TYPE_MESH_BCK_KEEPALIVE;
4051 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4052 "sending %s keepalive for connection %s[%d]\n",
4053 fwd ? "FWD" : "BCK",
4054 peer2s (c->t->peer),
4057 msg = (struct GNUNET_MESH_ConnectionKeepAlive *) cbuf;
4058 msg->header.size = htons (size);
4059 msg->header.type = htons (type);
4062 send_prebuilt_message_connection (&msg->header, c, NULL, fwd);
4067 * Send CONNECTION_{CREATE/ACK} packets for a connection.
4069 * @param c Connection for which to send the message.
4070 * @param fwd If GNUNET_YES, send CREATE, otherwise send ACK.
4073 connection_recreate (struct MeshConnection *c, int fwd)
4075 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "sending connection recreate\n");
4077 send_connection_create (c);
4079 send_connection_ack (c, GNUNET_NO);
4084 * Generic connection timer management.
4085 * Depending on the role of the peer in the connection will send the
4086 * appropriate message (build or keepalive)
4088 * @param c Conncetion to maintain.
4089 * @param fwd Is FWD?
4092 connection_maintain (struct MeshConnection *c, int fwd)
4094 if (MESH_TUNNEL_SEARCHING == c->t->state)
4096 /* TODO DHT GET with RO_BART */
4101 case MESH_CONNECTION_NEW:
4103 case MESH_CONNECTION_SENT:
4104 connection_recreate (c, fwd);
4106 case MESH_CONNECTION_READY:
4107 connection_keepalive (c, fwd);
4116 connection_fwd_keepalive (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
4118 struct MeshConnection *c = cls;
4120 c->fwd_maintenance_task = GNUNET_SCHEDULER_NO_TASK;
4121 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
4124 connection_maintain (c, GNUNET_YES);
4125 c->fwd_maintenance_task = GNUNET_SCHEDULER_add_delayed (refresh_connection_time,
4126 &connection_fwd_keepalive,
4132 connection_bck_keepalive (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
4134 struct MeshConnection *c = cls;
4136 c->bck_maintenance_task = GNUNET_SCHEDULER_NO_TASK;
4137 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
4140 connection_maintain (c, GNUNET_NO);
4141 c->bck_maintenance_task = GNUNET_SCHEDULER_add_delayed (refresh_connection_time,
4142 &connection_bck_keepalive,
4148 * Send a message to all peers in this connection that the connection
4149 * is no longer valid.
4151 * If some peer should not receive the message, it should be zero'ed out
4152 * before calling this function.
4154 * @param c The connection whose peers to notify.
4157 connection_send_destroy (struct MeshConnection *c)
4159 struct GNUNET_MESH_ConnectionDestroy msg;
4161 msg.header.size = htons (sizeof (msg));
4162 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY);;
4164 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4165 " sending connection destroy for connection %s[%X]\n",
4166 peer2s (c->t->peer),
4169 if (GNUNET_NO == connection_is_terminal (c, GNUNET_YES))
4170 send_prebuilt_message_connection (&msg.header, c, NULL, GNUNET_YES);
4171 if (GNUNET_NO == connection_is_terminal (c, GNUNET_NO))
4172 send_prebuilt_message_connection (&msg.header, c, NULL, GNUNET_NO);
4173 c->destroy = GNUNET_YES;
4178 * Confirm we got a channel create.
4180 * @param ch The channel to confirm.
4181 * @param fwd Should we send the ACK fwd?
4184 channel_send_ack (struct MeshChannel *ch, int fwd)
4186 struct GNUNET_MESH_ChannelManage msg;
4188 msg.header.size = htons (sizeof (msg));
4189 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CHANNEL_ACK);
4190 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4191 " sending channel %s ack for channel %s:%X\n",
4192 fwd ? "FWD" : "BCK", peer2s (ch->t->peer),
4195 msg.chid = htonl (ch->gid);
4196 send_prebuilt_message_channel (&msg.header, ch, !fwd);
4201 * Send a message to all clients (local and remote) of this channel
4202 * notifying that the channel is no longer valid.
4204 * If some peer or client should not receive the message,
4205 * should be zero'ed out before calling this function.
4207 * @param ch The channel whose clients to notify.
4210 channel_send_destroy (struct MeshChannel *ch)
4212 struct GNUNET_MESH_ChannelManage msg;
4214 msg.header.size = htons (sizeof (msg));
4215 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY);
4216 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4217 " sending channel destroy for channel %s:%X\n",
4218 peer2s (ch->t->peer),
4221 if (channel_is_terminal (ch, GNUNET_NO))
4223 if (NULL != ch->root && GNUNET_NO == ch->root->shutting_down)
4225 msg.chid = htonl (ch->lid_root);
4226 send_local_channel_destroy (ch, GNUNET_NO);
4231 msg.chid = htonl (ch->gid);
4232 send_prebuilt_message_channel (&msg.header, ch, GNUNET_NO);
4235 if (channel_is_terminal (ch, GNUNET_YES))
4237 if (NULL != ch->dest && GNUNET_NO == ch->dest->shutting_down)
4239 msg.chid = htonl (ch->lid_dest);
4240 send_local_channel_destroy (ch, GNUNET_YES);
4245 msg.chid = htonl (ch->gid);
4246 send_prebuilt_message_channel (&msg.header, ch, GNUNET_YES);
4254 static struct MeshTunnel2 *
4257 struct MeshTunnel2 *t;
4259 t = GNUNET_new (struct MeshTunnel2);
4261 t->next_local_chid = GNUNET_MESH_LOCAL_CHANNEL_ID_SERV;
4263 // GNUNET_CONTAINER_multihashmap_put (tunnels, tid, t,
4264 // GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST))
4266 // GNUNET_break (0);
4267 // tunnel_destroy (t);
4271 // char salt[] = "salt";
4272 // GNUNET_CRYPTO_kdf (&t->e_key, sizeof (struct GNUNET_CRYPTO_AesSessionKey),
4273 // salt, sizeof (salt),
4274 // &t->e_key, sizeof (struct GNUNET_CRYPTO_AesSessionKey),
4275 // &my_full_id, sizeof (struct GNUNET_PeerIdentity),
4276 // GNUNET_PEER_resolve2 (t->peer->id), sizeof (struct GNUNET_PeerIdentity),
4278 // GNUNET_CRYPTO_kdf (&t->d_key, sizeof (struct GNUNET_CRYPTO_AesSessionKey),
4279 // salt, sizeof (salt),
4280 // &t->d_key, sizeof (struct GNUNET_CRYPTO_AesSessionKey),
4281 // GNUNET_PEER_resolve2 (t->peer->id), sizeof (struct GNUNET_PeerIdentity),
4282 // &my_full_id, sizeof (struct GNUNET_PeerIdentity),
4290 * Add a connection to a tunnel.
4293 * @param c Connection.
4296 tunnel_add_connection (struct MeshTunnel2 *t, struct MeshConnection *c)
4298 struct MeshConnection *aux;
4300 for (aux = t->connection_head; aux != NULL; aux = aux->next)
4303 GNUNET_CONTAINER_DLL_insert_tail (t->connection_head, t->connection_tail, c);
4308 * Initialize a Flow Control structure to the initial state.
4310 * @param fc Flow Control structure to initialize.
4313 fc_init (struct MeshFlowControl *fc)
4316 fc->last_pid_sent = (uint32_t) -1; /* Next (expected) = 0 */
4317 fc->last_pid_recv = (uint32_t) -1;
4318 fc->last_ack_sent = (uint32_t) 0;
4319 fc->last_ack_recv = (uint32_t) 0;
4320 fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
4321 fc->poll_time = GNUNET_TIME_UNIT_SECONDS;
4323 fc->queue_max = (max_msgs_queue / max_connections) + 1;
4327 static struct MeshConnection *
4328 connection_new (const struct GNUNET_HashCode *cid)
4330 struct MeshConnection *c;
4332 c = GNUNET_new (struct MeshConnection);
4334 GNUNET_CONTAINER_multihashmap_put (connections, &c->id, c,
4335 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST);
4336 fc_init (&c->fwd_fc);
4337 fc_init (&c->bck_fc);
4346 * Find a connection.
4348 * @param cid Connection ID.
4350 static struct MeshConnection *
4351 connection_get (const struct GNUNET_HashCode *cid)
4353 return GNUNET_CONTAINER_multihashmap_get (connections, cid);
4358 connection_destroy (struct MeshConnection *c)
4360 struct MeshPeer *peer;
4365 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "destroying connection %s[%X]\n",
4366 peer2s (c->t->peer),
4369 /* Cancel all traffic */
4370 connection_cancel_queues (c, GNUNET_YES);
4371 connection_cancel_queues (c, GNUNET_NO);
4373 /* Cancel maintainance task (keepalive/timeout) */
4374 if (GNUNET_SCHEDULER_NO_TASK != c->fwd_maintenance_task)
4375 GNUNET_SCHEDULER_cancel (c->fwd_maintenance_task);
4376 if (GNUNET_SCHEDULER_NO_TASK != c->bck_maintenance_task)
4377 GNUNET_SCHEDULER_cancel (c->bck_maintenance_task);
4379 /* Deregister from neighbors */
4380 peer = connection_get_next_hop (c);
4381 if (NULL != peer && NULL != peer->connections)
4382 GNUNET_CONTAINER_multihashmap_remove (peer->connections, &c->id, c);
4383 peer = connection_get_prev_hop (c);
4384 if (NULL != peer && NULL != peer->connections)
4385 GNUNET_CONTAINER_multihashmap_remove (peer->connections, &c->id, c);
4388 GNUNET_STATISTICS_update (stats, "# connections", -1, GNUNET_NO);
4389 GNUNET_CONTAINER_DLL_remove (c->t->connection_head, c->t->connection_tail, c);
4395 tunnel_destroy (struct MeshTunnel2 *t)
4397 struct MeshConnection *c;
4398 struct MeshConnection *next;
4403 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "destroying tunnel %s\n",
4406 // if (GNUNET_YES != GNUNET_CONTAINER_multihashmap_remove (tunnels, &t->id, t))
4407 // GNUNET_break (0);
4409 for (c = t->connection_head; NULL != c; c = next)
4412 connection_destroy (c);
4415 GNUNET_STATISTICS_update (stats, "# tunnels", -1, GNUNET_NO);
4422 * Tunnel is empty: destroy it.
4424 * Notifies all connections about the destruction.
4426 * @param t Tunnel to destroy.
4429 tunnel_destroy_empty (struct MeshTunnel2 *t)
4431 struct MeshConnection *c;
4433 for (c = t->connection_head; NULL != c; c = c->next)
4435 if (GNUNET_NO == c->destroy)
4436 connection_send_destroy (c);
4439 if (0 == t->pending_messages)
4442 t->destroy = GNUNET_YES;
4447 * Destroy tunnel if empty (no more channels).
4449 * @param t Tunnel to destroy if empty.
4452 tunnel_destroy_if_empty (struct MeshTunnel2 *t)
4454 if (NULL != t->channel_head)
4457 tunnel_destroy_empty (t);
4462 * Destroy a channel and free all resources.
4464 * @param ch Channel to destroy.
4467 channel_destroy (struct MeshChannel *ch)
4469 struct MeshClient *c;
4477 if (GNUNET_YES != GNUNET_CONTAINER_multihashmap32_remove (c->own_channels,
4488 GNUNET_CONTAINER_multihashmap32_remove (c->incoming_channels,
4495 channel_rel_free_all (ch->root_rel);
4496 channel_rel_free_all (ch->dest_rel);
4498 GNUNET_CONTAINER_DLL_remove (ch->t->channel_head, ch->t->channel_tail, ch);
4499 GNUNET_STATISTICS_update (stats, "# channels", -1, GNUNET_NO);
4505 * Create a new channel.
4507 * @param t Tunnel this channel is in.
4508 * @param owner Client that owns the channel, NULL for foreign channels.
4509 * @param lid_root Local ID for root client.
4511 * @return A new initialized channel. NULL on error.
4513 static struct MeshChannel *
4514 channel_new (struct MeshTunnel2 *t,
4515 struct MeshClient *owner, MESH_ChannelNumber lid_root)
4517 struct MeshChannel *ch;
4519 ch = GNUNET_new (struct MeshChannel);
4521 ch->lid_root = lid_root;
4524 GNUNET_CONTAINER_DLL_insert (t->channel_head, t->channel_tail, ch);
4526 GNUNET_STATISTICS_update (stats, "# channels", 1, GNUNET_NO);
4530 while (NULL != channel_get (t, t->next_chid))
4531 t->next_chid = (t->next_chid + 1) & ~GNUNET_MESH_LOCAL_CHANNEL_ID_CLI;
4532 ch->gid = t->next_chid;
4533 t->next_chid = (t->next_chid + 1) & ~GNUNET_MESH_LOCAL_CHANNEL_ID_CLI;
4536 GNUNET_CONTAINER_multihashmap32_put (owner->own_channels, lid_root, ch,
4537 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
4540 channel_destroy (ch);
4541 GNUNET_SERVER_receive_done (owner->handle, GNUNET_SYSERR);
4551 * Set options in a channel, extracted from a bit flag field
4553 * @param ch Channel to set options to.
4554 * @param options Bit array in host byte order.
4557 channel_set_options (struct MeshChannel *ch, uint32_t options)
4559 ch->nobuffer = (options & GNUNET_MESH_OPTION_NOBUFFER) != 0 ?
4560 GNUNET_YES : GNUNET_NO;
4561 ch->reliable = (options & GNUNET_MESH_OPTION_RELIABLE) != 0 ?
4562 GNUNET_YES : GNUNET_NO;
4567 * Iterator for deleting each channel whose client endpoint disconnected.
4569 * @param cls Closure (client that has disconnected).
4570 * @param key The local channel id (used to access the hashmap).
4571 * @param value The value stored at the key (channel to destroy).
4573 * @return GNUNET_OK, keep iterating.
4576 channel_destroy_iterator (void *cls,
4580 struct MeshChannel *ch = value;
4581 struct MeshClient *c = cls;
4582 struct MeshTunnel2 *t;
4584 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4585 " Channel %X (%X / %X) destroy, due to client %u shutdown.\n",
4586 ch->gid, ch->lid_root, ch->lid_dest, c->id);
4590 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Client %u is destination.\n", c->id);
4594 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Client %u is owner.\n", c->id);
4598 channel_send_destroy (ch);
4599 channel_destroy (ch);
4600 tunnel_destroy_if_empty (t);
4607 * Remove client's ports from the global hashmap on disconnect.
4609 * @param cls Closure (unused).
4611 * @param value Client structure.
4613 * @return GNUNET_OK, keep iterating.
4616 client_release_ports (void *cls,
4622 res = GNUNET_CONTAINER_multihashmap32_remove (ports, key, value);
4623 if (GNUNET_YES != res)
4626 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
4627 "Port %u by client %p was not registered.\n",
4635 * Timeout function due to lack of keepalive/traffic from the owner.
4636 * Destroys connection if called.
4638 * @param cls Closure (connection to destroy).
4639 * @param tc TaskContext.
4642 connection_fwd_timeout (void *cls,
4643 const struct GNUNET_SCHEDULER_TaskContext *tc)
4645 struct MeshConnection *c = cls;
4647 c->fwd_maintenance_task = GNUNET_SCHEDULER_NO_TASK;
4648 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
4650 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4651 "Connection %s[%X] FWD timed out. Destroying.\n",
4652 peer2s (c->t->peer),
4655 if (connection_is_origin (c, GNUNET_YES)) /* If local, leave. */
4658 connection_destroy (c);
4663 * Timeout function due to lack of keepalive/traffic from the destination.
4664 * Destroys connection if called.
4666 * @param cls Closure (connection to destroy).
4667 * @param tc TaskContext
4670 connection_bck_timeout (void *cls,
4671 const struct GNUNET_SCHEDULER_TaskContext *tc)
4673 struct MeshConnection *c = cls;
4675 c->bck_maintenance_task = GNUNET_SCHEDULER_NO_TASK;
4676 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
4679 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4680 "Connection %s[%X] FWD timed out. Destroying.\n",
4681 peer2s (c->t->peer),
4684 if (connection_is_origin (c, GNUNET_NO)) /* If local, leave. */
4687 connection_destroy (c);
4692 * Resets the connection timeout task, some other message has done the
4694 * - For the first peer on the direction this means to send
4695 * a keepalive or a path confirmation message (either create or ACK).
4696 * - For all other peers, this means to destroy the connection,
4697 * due to lack of activity.
4698 * Starts the tiemout if no timeout was running (connection just created).
4700 * @param c Connection whose timeout to reset.
4701 * @param fwd Is this forward?
4703 * TODO use heap to improve efficiency of scheduler.
4706 connection_reset_timeout (struct MeshConnection *c, int fwd)
4708 GNUNET_SCHEDULER_TaskIdentifier *ti;
4709 GNUNET_SCHEDULER_Task f;
4711 ti = fwd ? &c->fwd_maintenance_task : &c->bck_maintenance_task;
4713 if (GNUNET_SCHEDULER_NO_TASK != *ti)
4714 GNUNET_SCHEDULER_cancel (*ti);
4716 if (connection_is_origin (c, fwd)) /* Endpoint */
4718 f = fwd ? &connection_fwd_keepalive : &connection_bck_keepalive;
4719 *ti = GNUNET_SCHEDULER_add_delayed (refresh_connection_time, f, c);
4723 struct GNUNET_TIME_Relative delay;
4725 delay = GNUNET_TIME_relative_multiply (refresh_connection_time, 4);
4726 f = fwd ? &connection_fwd_timeout : &connection_bck_timeout;
4727 *ti = GNUNET_SCHEDULER_add_delayed (delay, f, c);
4733 * Iterator to notify all connections of a broken link. Mark connections
4734 * to destroy after all traffic has been sent.
4736 * @param cls Closure (peer disconnected).
4737 * @param key Current key code (tid).
4738 * @param value Value in the hash map (connection).
4740 * @return GNUNET_YES if we should continue to iterate,
4744 connection_broken (void *cls,
4745 const struct GNUNET_HashCode *key,
4748 struct MeshPeer *peer = cls;
4749 struct MeshConnection *c = value;
4750 struct GNUNET_MESH_ConnectionBroken msg;
4753 fwd = peer == connection_get_prev_hop (c);
4755 if (connection_is_terminal (c, fwd))
4757 /* Local shutdown: no point in iterating anymore */
4758 connection_destroy (c);
4761 connection_cancel_queues (c, !fwd);
4763 msg.header.size = htons (sizeof (struct GNUNET_MESH_ConnectionBroken));
4764 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CONNECTION_BROKEN);
4766 msg.peer1 = my_full_id;
4767 msg.peer2 = *GNUNET_PEER_resolve2 (peer->id);
4768 send_prebuilt_message_connection (&msg.header, c, NULL, fwd);
4769 c->destroy = GNUNET_YES;
4774 /******************************************************************************/
4775 /**************** MESH NETWORK HANDLER HELPERS ***********************/
4776 /******************************************************************************/
4779 * Free a transmission that was already queued with all resources
4780 * associated to the request.
4782 * @param queue Queue handler to cancel.
4783 * @param clear_cls Is it necessary to free associated cls?
4786 queue_destroy (struct MeshPeerQueue *queue, int clear_cls)
4788 struct MeshPeer *peer;
4789 struct MeshFlowControl *fc;
4794 GNUNET_assert (NULL != queue->c);
4795 fc = fwd ? &queue->c->fwd_fc : &queue->c->bck_fc;
4797 if (GNUNET_YES == clear_cls)
4799 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " queue destroy type %s\n",
4800 GNUNET_MESH_DEBUG_M2S (queue->type));
4801 switch (queue->type)
4803 case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_DESTROY:
4804 case GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY:
4805 GNUNET_log (GNUNET_ERROR_TYPE_INFO, "destroying a DESTROY message\n");
4806 GNUNET_break (GNUNET_YES == queue->c->destroy);
4808 case GNUNET_MESSAGE_TYPE_MESH_FWD:
4809 case GNUNET_MESSAGE_TYPE_MESH_BCK:
4810 case GNUNET_MESSAGE_TYPE_MESH_ACK:
4811 case GNUNET_MESSAGE_TYPE_MESH_POLL:
4812 case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_ACK:
4813 case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_CREATE:
4814 case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_BROKEN:
4815 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " prebuilt message\n");;
4816 GNUNET_free_non_null (queue->cls);
4821 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, " type %s unknown!\n",
4822 GNUNET_MESH_DEBUG_M2S (queue->type));
4826 GNUNET_CONTAINER_DLL_remove (peer->queue_head, peer->queue_tail, queue);
4828 if (queue->type != GNUNET_MESSAGE_TYPE_MESH_ACK &&
4829 queue->type != GNUNET_MESSAGE_TYPE_MESH_POLL)
4831 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Q_N- %p %u\n", fc, fc->queue_n);
4835 if (NULL != queue->c)
4837 queue->c->pending_messages--;
4838 if (NULL != queue->c->t)
4840 queue->c->t->pending_messages--;
4844 GNUNET_free (queue);
4849 queue_send (void *cls, size_t size, void *buf)
4851 struct MeshPeer *peer = cls;
4852 struct MeshFlowControl *fc;
4853 struct MeshConnection *c;
4854 struct GNUNET_MessageHeader *msg;
4855 struct MeshPeerQueue *queue;
4856 struct MeshTunnel2 *t;
4857 struct MeshChannel *ch;
4858 const struct GNUNET_PeerIdentity *dst_id;
4864 peer->core_transmit = NULL;
4865 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* Queue send (max %u)\n", size);
4867 if (NULL == buf || 0 == size)
4869 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* Buffer size 0.\n");
4874 queue = peer_get_first_message (peer);
4877 GNUNET_break (0); /* Core tmt_rdy should've been canceled */
4882 fc = fwd ? &c->fwd_fc : &c->bck_fc;
4885 dst_id = GNUNET_PEER_resolve2 (peer->id);
4886 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* towards %s\n", GNUNET_i2s (dst_id));
4887 /* Check if buffer size is enough for the message */
4888 if (queue->size > size)
4890 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* not enough room, reissue\n");
4891 peer->core_transmit =
4892 GNUNET_CORE_notify_transmit_ready (core_handle,
4895 GNUNET_TIME_UNIT_FOREVER_REL,
4902 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* size %u ok\n", queue->size);
4904 t = (NULL != c) ? c->t : NULL;
4908 switch (queue->type)
4910 case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_DESTROY:
4911 case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_BROKEN:
4912 case GNUNET_MESSAGE_TYPE_MESH_FWD:
4913 case GNUNET_MESSAGE_TYPE_MESH_BCK:
4914 case GNUNET_MESSAGE_TYPE_MESH_ACK:
4915 case GNUNET_MESSAGE_TYPE_MESH_POLL:
4916 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4918 GNUNET_MESH_DEBUG_M2S (queue->type));
4919 data_size = send_core_data_raw (queue->cls, size, buf);
4920 msg = (struct GNUNET_MessageHeader *) buf;
4921 type = ntohs (msg->type);
4923 case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_CREATE:
4924 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* path create\n");
4925 if (connection_is_origin (c, GNUNET_YES))
4926 data_size = send_core_connection_create (queue->c, size, buf);
4928 data_size = send_core_data_raw (queue->cls, size, buf);
4930 case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_ACK:
4931 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* path ack\n");
4932 if (connection_is_origin (c, GNUNET_NO))
4933 data_size = send_core_connection_ack (queue->c, size, buf);
4935 data_size = send_core_data_raw (queue->cls, size, buf);
4937 case GNUNET_MESSAGE_TYPE_MESH_DATA:
4938 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE:
4939 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY:
4940 /* This should be encapsulted */
4946 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "* type unknown: %u\n",
4951 if (0 < drop_percent &&
4952 GNUNET_CRYPTO_random_u32(GNUNET_CRYPTO_QUALITY_WEAK, 101) < drop_percent)
4954 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
4955 "Dropping message of type %s\n",
4956 GNUNET_MESH_DEBUG_M2S (queue->type));
4960 /* Free queue, but cls was freed by send_core_* */
4962 queue_destroy (queue, GNUNET_NO);
4964 /* Send ACK if needed, after accounting for sent ID in fc->queue_n */
4967 case GNUNET_MESSAGE_TYPE_MESH_FWD:
4968 case GNUNET_MESSAGE_TYPE_MESH_BCK:
4969 pid = ntohl ( ((struct GNUNET_MESH_Encrypted *) buf)->pid );
4970 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* accounting pid %u\n", pid);
4971 fc->last_pid_sent = pid;
4972 send_ack (c, ch, fwd);
4978 /* If more data in queue, send next */
4979 queue = peer_get_first_message (peer);
4982 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* more data!\n");
4983 if (NULL == peer->core_transmit) {
4984 peer->core_transmit =
4985 GNUNET_CORE_notify_transmit_ready(core_handle,
4988 GNUNET_TIME_UNIT_FOREVER_REL,
4996 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4997 "* tmt rdy called somewhere else\n");
4999 if (GNUNET_SCHEDULER_NO_TASK == fc->poll_task)
5001 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* starting poll timeout\n");
5003 GNUNET_SCHEDULER_add_delayed (fc->poll_time, &connection_poll, fc);
5008 if (GNUNET_SCHEDULER_NO_TASK != fc->poll_task)
5010 GNUNET_SCHEDULER_cancel (fc->poll_task);
5011 fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
5016 c->pending_messages--;
5017 if (GNUNET_YES == c->destroy && 0 == c->pending_messages)
5019 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* destroying connection!\n");
5020 connection_destroy (c);
5026 t->pending_messages--;
5027 if (GNUNET_YES == t->destroy && 0 == t->pending_messages)
5029 // GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* destroying tunnel!\n");
5033 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* Return %d\n", data_size);
5039 queue_add (void *cls, uint16_t type, size_t size,
5040 struct MeshConnection *c,
5041 struct MeshChannel *ch,
5044 struct MeshPeerQueue *queue;
5045 struct MeshFlowControl *fc;
5046 struct MeshPeer *peer;
5050 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5051 "queue add %s %s (%u) on c %p, ch %p\n",
5052 fwd ? "FWD" : "BCK", GNUNET_MESH_DEBUG_M2S (type), size, c, ch);
5053 GNUNET_assert (NULL != c);
5055 fc = fwd ? &c->fwd_fc : &c->bck_fc;
5056 peer = fwd ? connection_get_next_hop (c) : connection_get_prev_hop (c);
5066 if (GNUNET_MESSAGE_TYPE_MESH_POLL == type ||
5067 GNUNET_MESSAGE_TYPE_MESH_ACK == type)
5072 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "priority %d\n", priority);
5073 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "fc %p\n", fc);
5074 if (fc->queue_n >= fc->queue_max && 0 == priority)
5076 GNUNET_STATISTICS_update (stats, "# messages dropped (buffer full)",
5079 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5080 "queue full: %u/%u\n",
5081 fc->queue_n, fc->queue_max);
5082 return; /* Drop this message */
5085 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "last pid %u\n", fc->last_pid_sent);
5086 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ack %u\n", fc->last_ack_recv);
5087 if (GMC_is_pid_bigger (fc->last_pid_sent + 1, fc->last_ack_recv))
5089 call_core = GNUNET_NO;
5090 if (GNUNET_SCHEDULER_NO_TASK == fc->poll_task &&
5091 GNUNET_MESSAGE_TYPE_MESH_POLL != type)
5093 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5094 "no buffer space (%u > %u): starting poll\n",
5095 fc->last_pid_sent + 1, fc->last_ack_recv);
5096 fc->poll_task = GNUNET_SCHEDULER_add_delayed (fc->poll_time,
5102 call_core = GNUNET_YES;
5103 queue = GNUNET_malloc (sizeof (struct MeshPeerQueue));
5111 if (100 <= priority)
5113 GNUNET_CONTAINER_DLL_insert (peer->queue_head, peer->queue_tail, queue);
5117 GNUNET_CONTAINER_DLL_insert_tail (peer->queue_head, peer->queue_tail, queue);
5118 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Q_N+ %p %u\n", fc, fc->queue_n);
5123 if (NULL == peer->core_transmit && GNUNET_YES == call_core)
5125 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5126 "calling core tmt rdy towards %s for %u bytes\n",
5127 peer2s (peer), size);
5128 peer->core_transmit =
5129 GNUNET_CORE_notify_transmit_ready (core_handle,
5132 GNUNET_TIME_UNIT_FOREVER_REL,
5133 GNUNET_PEER_resolve2 (peer->id),
5140 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5141 "core tmt rdy towards %s already called\n",
5145 c->pending_messages++;
5147 c->t->pending_messages++;
5151 /******************************************************************************/
5152 /******************** MESH NETWORK HANDLERS **************************/
5153 /******************************************************************************/
5157 * Generic handler for mesh network payload traffic.
5159 * @param t Tunnel on which we got this message.
5160 * @param message Unencryted data message.
5161 * @param fwd Is this FWD traffic? GNUNET_YES : GNUNET_NO;
5164 handle_data (struct MeshTunnel2 *t, const struct GNUNET_MESH_Data *msg, int fwd)
5166 struct MeshChannelReliability *rel;
5167 struct MeshChannel *ch;
5168 struct MeshClient *c;
5174 size = ntohs (msg->header.size);
5176 sizeof (struct GNUNET_MESH_Data) +
5177 sizeof (struct GNUNET_MessageHeader))
5182 type = ntohs (msg->header.type);
5183 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "got a %s message\n",
5184 GNUNET_MESH_DEBUG_M2S (type));
5185 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " payload of type %s\n",
5186 GNUNET_MESH_DEBUG_M2S (ntohs (msg[1].header.type)));
5189 ch = channel_get (t, ntohl (msg->chid));
5192 GNUNET_STATISTICS_update (stats, "# data on unknown channel", 1, GNUNET_NO);
5193 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "WARNING channel unknown\n");
5197 /* Initialize FWD/BCK data */
5198 c = fwd ? ch->dest : ch->root;
5199 rel = fwd ? ch->dest_rel : ch->root_rel;
5207 tunnel_change_state (t, MESH_TUNNEL_READY);
5209 GNUNET_STATISTICS_update (stats, "# data received", 1, GNUNET_NO);
5211 mid = ntohl (msg->mid);
5212 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " mid %u\n", mid);
5214 if (GNUNET_NO == ch->reliable ||
5215 ( !GMC_is_pid_bigger (rel->mid_recv, mid) &&
5216 GMC_is_pid_bigger (rel->mid_recv + 64, mid) ) )
5218 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! RECV %u\n", mid);
5219 if (GNUNET_YES == ch->reliable)
5221 /* Is this the exact next expected messasge? */
5222 if (mid == rel->mid_recv)
5224 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "as expected\n");
5226 channel_send_client_data (ch, msg, fwd);
5230 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "save for later\n");
5231 channel_rel_add_buffered_data (msg, rel);
5236 /* Tunnel is unreliable: send to clients directly */
5237 /* FIXME: accept Out Of Order traffic */
5238 rel->mid_recv = mid + 1;
5239 channel_send_client_data (ch, msg, fwd);
5244 GNUNET_break_op (0);
5245 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5246 " MID %u not expected (%u - %u), dropping!\n",
5247 mid, rel->mid_recv, rel->mid_recv + 64);
5250 channel_send_data_ack (ch, fwd);
5254 * Handler for mesh network traffic end-to-end ACKs.
5256 * @param t Tunnel on which we got this message.
5257 * @param message Data message.
5258 * @param fwd Is this a fwd ACK? (dest->orig)
5261 handle_data_ack (struct MeshTunnel2 *t,
5262 const struct GNUNET_MESH_DataACK *msg, int fwd)
5264 struct MeshChannelReliability *rel;
5265 struct MeshReliableMessage *copy;
5266 struct MeshReliableMessage *next;
5267 struct MeshChannel *ch;
5272 type = ntohs (msg->header.type);
5273 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got a %s message!\n",
5274 GNUNET_MESH_DEBUG_M2S (type));
5275 ch = channel_get (t, ntohl (msg->chid));
5278 GNUNET_STATISTICS_update (stats, "# ack on unknown channel", 1, GNUNET_NO);
5281 ack = ntohl (msg->mid);
5282 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! %s ACK %u\n",
5283 (GNUNET_YES == fwd) ? "FWD" : "BCK", ack);
5285 if (GNUNET_YES == fwd)
5299 for (work = GNUNET_NO, copy = rel->head_sent; copy != NULL; copy = next)
5301 if (GMC_is_pid_bigger (copy->mid, ack))
5303 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! head %u, out!\n", copy->mid);
5304 channel_rel_free_sent (rel, msg);
5308 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! id %u\n", copy->mid);
5310 rel_message_free (copy);
5312 /* ACK client if needed */
5313 // channel_send_ack (t, type, GNUNET_MESSAGE_TYPE_MESH_UNICAST_ACK == type);
5315 /* If some message was free'd, update the retransmission delay*/
5316 if (GNUNET_YES == work)
5318 if (GNUNET_SCHEDULER_NO_TASK != rel->retry_task)
5320 GNUNET_SCHEDULER_cancel (rel->retry_task);
5321 if (NULL == rel->head_sent)
5323 rel->retry_task = GNUNET_SCHEDULER_NO_TASK;
5327 struct GNUNET_TIME_Absolute new_target;
5328 struct GNUNET_TIME_Relative delay;
5330 delay = GNUNET_TIME_relative_multiply (rel->retry_timer,
5331 MESH_RETRANSMIT_MARGIN);
5332 new_target = GNUNET_TIME_absolute_add (rel->head_sent->timestamp,
5334 delay = GNUNET_TIME_absolute_get_remaining (new_target);
5336 GNUNET_SCHEDULER_add_delayed (delay,
5337 &channel_retransmit_message,
5348 * Core handler for connection creation.
5350 * @param cls Closure (unused).
5351 * @param peer Sender (neighbor).
5352 * @param message Message.
5354 * @return GNUNET_OK to keep the connection open,
5355 * GNUNET_SYSERR to close it (signal serious error)
5358 handle_mesh_connection_create (void *cls,
5359 const struct GNUNET_PeerIdentity *peer,
5360 const struct GNUNET_MessageHeader *message)
5362 struct GNUNET_MESH_ConnectionCreate *msg;
5363 struct GNUNET_PeerIdentity *id;
5364 struct GNUNET_HashCode *cid;
5365 struct MeshPeerPath *path;
5366 struct MeshPeer *dest_peer;
5367 struct MeshPeer *orig_peer;
5368 struct MeshConnection *c;
5369 unsigned int own_pos;
5373 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "\n\n");
5374 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received a connection create msg\n");
5377 size = ntohs (message->size);
5378 if (size < sizeof (struct GNUNET_MESH_ConnectionCreate))
5380 GNUNET_break_op (0);
5384 /* Calculate hops */
5385 size -= sizeof (struct GNUNET_MESH_ConnectionCreate);
5386 if (size % sizeof (struct GNUNET_PeerIdentity))
5388 GNUNET_break_op (0);
5391 size /= sizeof (struct GNUNET_PeerIdentity);
5394 GNUNET_break_op (0);
5397 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " path has %u hops.\n", size);
5399 /* Get parameters */
5400 msg = (struct GNUNET_MESH_ConnectionCreate *) message;
5402 id = (struct GNUNET_PeerIdentity *) &msg[1];
5403 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5404 " connection %s (%s).\n",
5405 GNUNET_h2s (cid), GNUNET_i2s (id));
5407 /* Create connection */
5408 c = connection_get (cid);
5411 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Creating connection\n");
5412 c = connection_new (cid);
5414 return GNUNET_OK; connection_reset_timeout (c, GNUNET_YES);
5415 tunnel_change_state (c->t, MESH_TUNNEL_WAITING);
5418 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Creating path...\n");
5419 path = path_new (size);
5421 for (i = 0; i < size; i++)
5423 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ... adding %s\n",
5424 GNUNET_i2s (&id[i]));
5425 path->peers[i] = GNUNET_PEER_intern (&id[i]);
5426 if (path->peers[i] == myid)
5429 if (own_pos == 0 && path->peers[own_pos] != myid)
5431 /* create path: self not found in path through self */
5432 GNUNET_break_op (0);
5433 path_destroy (path);
5434 connection_destroy (c);
5437 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Own position: %u\n", own_pos);
5438 path_add_to_peers (path, GNUNET_NO);
5439 c->path = path_duplicate (path);
5440 c->own_pos = own_pos;
5447 /* Remember peers */
5448 dest_peer = peer_get (&id[size - 1]);
5449 orig_peer = peer_get (&id[0]);
5451 /* Is it a connection to us? */
5452 if (c->own_pos == size - 1)
5454 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " It's for us!\n");
5455 peer_add_path_to_origin (orig_peer, path, GNUNET_YES);
5457 if (NULL == orig_peer->tunnel)
5459 orig_peer->tunnel = tunnel_new ();
5460 orig_peer->tunnel->peer = orig_peer;
5462 tunnel_add_connection (orig_peer->tunnel, c);
5464 send_connection_ack (c, GNUNET_NO);
5466 /* Keep tunnel alive in direction dest->owner*/
5467 connection_reset_timeout (c, GNUNET_NO);
5471 /* It's for somebody else! Retransmit. */
5472 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Retransmitting.\n");
5473 peer_add_path (dest_peer, path_duplicate (path), GNUNET_NO);
5474 peer_add_path_to_origin (orig_peer, path, GNUNET_NO);
5475 send_prebuilt_message_connection (message, c, NULL, GNUNET_YES);
5482 * Core handler for path ACKs
5484 * @param cls closure
5485 * @param message message
5486 * @param peer peer identity this notification is about
5488 * @return GNUNET_OK to keep the connection open,
5489 * GNUNET_SYSERR to close it (signal serious error)
5492 handle_mesh_connection_ack (void *cls, const struct GNUNET_PeerIdentity *peer,
5493 const struct GNUNET_MessageHeader *message)
5495 struct GNUNET_MESH_ConnectionACK *msg;
5496 struct MeshPeerPath *p;
5497 struct MeshConnection *c;
5499 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "\n\n");
5500 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received a connection ACK msg\n");
5501 msg = (struct GNUNET_MESH_ConnectionACK *) message;
5502 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " on connection %s\n",
5503 GNUNET_h2s (&msg->cid));
5504 c = connection_get (&msg->cid);
5507 GNUNET_STATISTICS_update (stats, "# control on unknown connection",
5509 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " don't know the connection!\n");
5513 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " via peer %s\n",
5516 /* Add path to peers? */
5520 path_add_to_peers (p, GNUNET_YES);
5526 connection_change_state (c, MESH_CONNECTION_READY);
5527 connection_reset_timeout (c, GNUNET_NO);
5529 /* Message for us as creator? */
5530 if (connection_is_origin (c, GNUNET_YES))
5532 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Connection (SYN)ACK for us!\n");
5533 if (MESH_TUNNEL_READY != c->t->state)
5534 tunnel_change_state (c->t, MESH_TUNNEL_READY);
5535 tunnel_send_queued_data (c->t, GNUNET_YES);
5536 if (3 <= tunnel_count_connections (c->t) && NULL != c->t->peer->dhtget)
5538 GNUNET_DHT_get_stop (c->t->peer->dhtget);
5539 c->t->peer->dhtget = NULL;
5541 send_connection_ack (c, GNUNET_NO);
5542 connection_change_state (c, MESH_CONNECTION_READY);
5546 /* Message for us as destination? */
5547 if (connection_is_terminal (c, GNUNET_YES))
5549 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Connection ACK for us!\n");
5550 if (MESH_TUNNEL_READY != c->t->state)
5551 tunnel_change_state (c->t, MESH_TUNNEL_READY);
5552 connection_change_state (c, MESH_CONNECTION_READY);
5553 tunnel_send_queued_data (c->t, GNUNET_NO);
5557 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " not for us, retransmitting...\n");
5558 send_prebuilt_message_connection (message, c, NULL, GNUNET_NO);
5564 * Core handler for notifications of broken paths
5566 * @param cls Closure (unused).
5567 * @param peer Peer identity of sending neighbor.
5568 * @param message Message.
5570 * @return GNUNET_OK to keep the connection open,
5571 * GNUNET_SYSERR to close it (signal serious error)
5574 handle_mesh_connection_broken (void *cls, const struct GNUNET_PeerIdentity *peer,
5575 const struct GNUNET_MessageHeader *message)
5577 struct GNUNET_MESH_ConnectionBroken *msg;
5578 struct MeshConnection *c;
5580 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5581 "Received a CONNECTION BROKEN msg from %s\n", GNUNET_i2s (peer));
5582 msg = (struct GNUNET_MESH_ConnectionBroken *) message;
5583 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " regarding %s\n",
5584 GNUNET_i2s (&msg->peer1));
5585 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " regarding %s\n",
5586 GNUNET_i2s (&msg->peer2));
5587 c = connection_get (&msg->cid);
5590 GNUNET_break_op (0);
5593 tunnel_notify_connection_broken (c->t, GNUNET_PEER_search (&msg->peer1),
5594 GNUNET_PEER_search (&msg->peer2));
5601 * Core handler for tunnel destruction
5603 * @param cls Closure (unused).
5604 * @param peer Peer identity of sending neighbor.
5605 * @param message Message.
5607 * @return GNUNET_OK to keep the connection open,
5608 * GNUNET_SYSERR to close it (signal serious error)
5611 handle_mesh_connection_destroy (void *cls,
5612 const struct GNUNET_PeerIdentity *peer,
5613 const struct GNUNET_MessageHeader *message)
5615 struct GNUNET_MESH_ConnectionDestroy *msg;
5616 struct MeshConnection *c;
5620 msg = (struct GNUNET_MESH_ConnectionDestroy *) message;
5621 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5622 "Got a CONNECTION DESTROY message from %s\n",
5624 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5625 " for connection %s\n",
5626 GNUNET_h2s (&msg->cid));
5627 c = connection_get (&msg->cid);
5630 /* Probably already got the message from another path,
5631 * destroyed the tunnel and retransmitted to children.
5634 GNUNET_STATISTICS_update (stats, "# control on unknown tunnel",
5638 id = GNUNET_PEER_search (peer);
5639 if (id == connection_get_prev_hop (c)->id)
5641 else if (id == connection_get_next_hop (c)->id)
5645 GNUNET_break_op (0);
5648 send_prebuilt_message_connection (message, c, NULL, fwd);
5649 c->destroy = GNUNET_YES;
5656 * Handler for channel create messages.
5658 * @param t Tunnel this channel is to be created in.
5659 * @param msg Message.
5660 * @param fwd Is this FWD traffic? GNUNET_YES : GNUNET_NO;
5663 handle_channel_create (struct MeshTunnel2 *t,
5664 struct GNUNET_MESH_ChannelCreate *msg,
5667 MESH_ChannelNumber chid;
5668 struct MeshChannel *ch;
5669 struct MeshClient *c;
5672 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received Channel Create\n");
5673 /* Check message size */
5674 if (ntohs (msg->header.size) != sizeof (struct GNUNET_MESH_ChannelCreate))
5676 GNUNET_break_op (0);
5680 /* Check if channel exists */
5681 chid = ntohl (msg->chid);
5682 ch = channel_get (t, chid);
5685 /* Probably a retransmission, safe to ignore */
5686 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " already exists...\n");
5687 if (NULL != ch->dest)
5689 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " duplicate CC!!\n");
5690 channel_send_ack (ch, !fwd);
5696 /* Create channel */
5697 ch = channel_new (t, NULL, 0);
5698 channel_set_options (ch, ntohl (msg->opt));
5701 /* Find a destination client */
5702 port = ntohl (msg->port);
5703 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " port %u\n", port);
5704 c = GNUNET_CONTAINER_multihashmap32_get (ports, port);
5707 /* TODO send reject */
5708 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " no client has port registered\n");
5713 channel_add_client (ch, c);
5714 if (GNUNET_YES == ch->reliable)
5715 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! Reliable\n");
5717 send_local_channel_create (ch);
5718 channel_send_ack (ch, fwd);
5719 send_local_ack (ch, !fwd);
5724 * Handler for channel ack messages.
5726 * @param t Tunnel this channel is to be created in.
5727 * @param msg Message.
5728 * @param fwd Is this FWD traffic? GNUNET_YES : GNUNET_NO;
5731 handle_channel_ack (struct MeshTunnel2 *t,
5732 struct GNUNET_MESH_ChannelManage *msg,
5735 MESH_ChannelNumber chid;
5736 struct MeshChannel *ch;
5738 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received Channel ACK\n");
5739 /* Check message size */
5740 if (ntohs (msg->header.size) != sizeof (struct GNUNET_MESH_ChannelManage))
5742 GNUNET_break_op (0);
5746 /* Check if channel exists */
5747 chid = ntohl (msg->chid);
5748 ch = channel_get (t, chid);
5751 GNUNET_break_op (0);
5752 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " channel %u unknown!!\n", chid);
5756 channel_confirm (ch, !fwd);
5761 * Handler for channel destroy messages.
5763 * @param t Tunnel this channel is to be destroyed of.
5764 * @param msg Message.
5765 * @param fwd Is this FWD traffic? GNUNET_YES : GNUNET_NO;
5768 handle_channel_destroy (struct MeshTunnel2 *t,
5769 struct GNUNET_MESH_ChannelManage *msg,
5772 MESH_ChannelNumber chid;
5773 struct MeshChannel *ch;
5775 /* Check message size */
5776 if (ntohs (msg->header.size) != sizeof (struct GNUNET_MESH_ChannelManage))
5778 GNUNET_break_op (0);
5782 /* Check if channel exists */
5783 chid = ntohl (msg->chid);
5784 ch = channel_get (t, chid);
5787 /* Probably a retransmission, safe to ignore */
5791 send_local_channel_destroy (ch, fwd);
5792 channel_destroy (ch);
5797 handle_decrypted (struct MeshTunnel2 *t,
5798 const struct GNUNET_MessageHeader *msgh,
5801 switch (ntohs (msgh->type))
5803 case GNUNET_MESSAGE_TYPE_MESH_DATA:
5804 /* Don't send hop ACK, wait for client to ACK */
5805 handle_data (t, (struct GNUNET_MESH_Data *) msgh, fwd);
5808 case GNUNET_MESSAGE_TYPE_MESH_DATA_ACK:
5809 handle_data_ack (t, (struct GNUNET_MESH_DataACK *) msgh, fwd);
5812 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE:
5813 handle_channel_create (t,
5814 (struct GNUNET_MESH_ChannelCreate *) msgh,
5818 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_ACK:
5819 handle_channel_ack (t,
5820 (struct GNUNET_MESH_ChannelManage *) msgh,
5824 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY:
5825 handle_channel_destroy (t,
5826 (struct GNUNET_MESH_ChannelManage *) msgh,
5831 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5832 "end-to-end message not known (%u)\n",
5833 ntohs (msgh->type));
5839 * Generic handler for mesh network encrypted traffic.
5841 * @param peer Peer identity this notification is about.
5842 * @param message Encrypted message.
5843 * @param fwd Is this FWD traffic? GNUNET_YES : GNUNET_NO;
5845 * @return GNUNET_OK to keep the connection open,
5846 * GNUNET_SYSERR to close it (signal serious error)
5849 handle_mesh_encrypted (const struct GNUNET_PeerIdentity *peer,
5850 const struct GNUNET_MESH_Encrypted *msg,
5853 struct MeshConnection *c;
5854 struct MeshTunnel2 *t;
5855 struct MeshPeer *neighbor;
5856 struct MeshFlowControl *fc;
5863 size = ntohs (msg->header.size);
5865 sizeof (struct GNUNET_MESH_Encrypted) +
5866 sizeof (struct GNUNET_MessageHeader))
5868 GNUNET_break_op (0);
5871 type = ntohs (msg->header.type);
5872 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "\n\n");
5873 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "got a %s message from %s\n",
5874 GNUNET_MESH_DEBUG_M2S (type), GNUNET_i2s (peer));
5876 /* Check connection */
5877 c = connection_get (&msg->cid);
5880 GNUNET_STATISTICS_update (stats, "# unknown connection", 1, GNUNET_NO);
5881 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "WARNING connection unknown\n");
5885 fc = fwd ? &c->bck_fc : &c->fwd_fc;
5887 /* Check if origin is as expected */
5888 neighbor = connection_get_hop (c, !fwd);
5889 if (peer_get (peer)->id != neighbor->id)
5891 GNUNET_break_op (0);
5896 pid = ntohl (msg->pid);
5897 if (GMC_is_pid_bigger (pid, fc->last_ack_sent))
5899 GNUNET_STATISTICS_update (stats, "# unsolicited message", 1, GNUNET_NO);
5900 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5901 "WARNING Received PID %u, (prev %u), ACK %u\n",
5902 pid, fc->last_pid_recv, fc->last_ack_sent);
5905 if (GNUNET_NO == GMC_is_pid_bigger (pid, fc->last_pid_recv))
5907 GNUNET_STATISTICS_update (stats, "# duplicate PID", 1, GNUNET_NO);
5908 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5909 " Pid %u not expected (%u+), dropping!\n",
5910 pid, fc->last_pid_recv + 1);
5913 if (MESH_CONNECTION_SENT == c->state)
5914 connection_change_state (c, MESH_CONNECTION_READY);
5915 connection_reset_timeout (c, fwd);
5916 fc->last_pid_recv = pid;
5918 /* Is this message for us? */
5919 if (connection_is_terminal (c, fwd))
5921 size_t dsize = size - sizeof (struct GNUNET_MESH_Encrypted);
5923 struct GNUNET_MessageHeader *msgh;
5926 /* TODO signature verification */
5927 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " message for us!\n");
5928 GNUNET_STATISTICS_update (stats, "# messages received", 1, GNUNET_NO);
5930 fc->last_pid_recv = pid;
5931 tunnel_decrypt (t, cbuf, &msg[1], dsize, msg->iv, fwd);
5935 msgh = (struct GNUNET_MessageHeader *) &cbuf[off];
5936 handle_decrypted (t, msgh, fwd);
5937 off += ntohs (msgh->size);
5939 send_ack (c, NULL, fwd);
5943 /* Message not for us: forward to next hop */
5944 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " not for us, retransmitting...\n");
5945 ttl = ntohl (msg->ttl);
5946 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ttl: %u\n", ttl);
5949 GNUNET_STATISTICS_update (stats, "# TTL drops", 1, GNUNET_NO);
5950 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, " TTL is 0, DROPPING!\n");
5951 send_ack (c, NULL, fwd);
5954 GNUNET_STATISTICS_update (stats, "# messages forwarded", 1, GNUNET_NO);
5956 send_prebuilt_message_connection (&msg->header, c, NULL, fwd);
5963 * Core handler for mesh network traffic going orig->dest.
5965 * @param cls Closure (unused).
5966 * @param message Message received.
5967 * @param peer Peer who sent the message.
5969 * @return GNUNET_OK to keep the connection open,
5970 * GNUNET_SYSERR to close it (signal serious error)
5973 handle_mesh_fwd (void *cls, const struct GNUNET_PeerIdentity *peer,
5974 const struct GNUNET_MessageHeader *message)
5976 return handle_mesh_encrypted (peer,
5977 (struct GNUNET_MESH_Encrypted *)message,
5982 * Core handler for mesh network traffic going dest->orig.
5984 * @param cls Closure (unused).
5985 * @param message Message received.
5986 * @param peer Peer who sent the message.
5988 * @return GNUNET_OK to keep the connection open,
5989 * GNUNET_SYSERR to close it (signal serious error)
5992 handle_mesh_bck (void *cls, const struct GNUNET_PeerIdentity *peer,
5993 const struct GNUNET_MessageHeader *message)
5995 return handle_mesh_encrypted (peer,
5996 (struct GNUNET_MESH_Encrypted *)message,
6002 * Core handler for mesh network traffic point-to-point acks.
6004 * @param cls closure
6005 * @param message message
6006 * @param peer peer identity this notification is about
6008 * @return GNUNET_OK to keep the connection open,
6009 * GNUNET_SYSERR to close it (signal serious error)
6012 handle_mesh_ack (void *cls, const struct GNUNET_PeerIdentity *peer,
6013 const struct GNUNET_MessageHeader *message)
6015 struct GNUNET_MESH_ACK *msg;
6016 struct MeshConnection *c;
6017 struct MeshFlowControl *fc;
6021 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "\n\n");
6022 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got an ACK packet from %s!\n",
6024 msg = (struct GNUNET_MESH_ACK *) message;
6026 c = connection_get (&msg->cid);
6030 GNUNET_STATISTICS_update (stats, "# ack on unknown connection", 1,
6035 /* Is this a forward or backward ACK? */
6036 id = GNUNET_PEER_search (peer);
6037 if (connection_get_next_hop (c)->id == id)
6039 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " FWD ACK\n");
6042 else if (connection_get_prev_hop (c)->id == id)
6044 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " BCK ACK\n");
6049 GNUNET_break_op (0);
6053 ack = ntohl (msg->ack);
6054 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ACK %u\n", ack);
6056 /* Cancel polling if the ACK is bigger than before. */
6057 if (GNUNET_SCHEDULER_NO_TASK != fc->poll_task &&
6058 GMC_is_pid_bigger (ack, fc->last_ack_recv))
6060 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Cancel poll\n");
6061 GNUNET_SCHEDULER_cancel (fc->poll_task);
6062 fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
6063 fc->poll_time = GNUNET_TIME_UNIT_SECONDS;
6066 fc->last_ack_recv = ack;
6067 connection_unlock_queue (c, fc == &c->fwd_fc);
6074 * Core handler for mesh network traffic point-to-point ack polls.
6076 * @param cls closure
6077 * @param message message
6078 * @param peer peer identity this notification is about
6080 * @return GNUNET_OK to keep the connection open,
6081 * GNUNET_SYSERR to close it (signal serious error)
6084 handle_mesh_poll (void *cls, const struct GNUNET_PeerIdentity *peer,
6085 const struct GNUNET_MessageHeader *message)
6087 struct GNUNET_MESH_Poll *msg;
6088 struct MeshConnection *c;
6089 struct MeshFlowControl *fc;
6094 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "\n\n");
6095 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got a POLL packet from %s!\n",
6098 msg = (struct GNUNET_MESH_Poll *) message;
6100 c = connection_get (&msg->cid);
6104 GNUNET_STATISTICS_update (stats, "# poll on unknown connection", 1,
6106 GNUNET_break_op (0);
6110 /* Is this a forward or backward ACK?
6111 * Note: a poll should never be needed in a loopback case,
6112 * since there is no possiblility of packet loss there, so
6113 * this way of discerining FWD/BCK should not be a problem.
6115 id = GNUNET_PEER_search (peer);
6116 if (connection_get_next_hop (c)->id == id)
6118 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " FWD ACK\n");
6121 else if (connection_get_prev_hop (c)->id == id)
6123 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " BCK ACK\n");
6128 GNUNET_break_op (0);
6132 pid = ntohl (msg->pid);
6133 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " PID %u, OLD %u\n",
6134 pid, fc->last_pid_recv);
6135 fc->last_pid_recv = pid;
6136 fwd = fc == &c->fwd_fc;
6137 send_ack (c, NULL, fwd);
6144 * Core handler for mesh keepalives.
6146 * @param cls closure
6147 * @param message message
6148 * @param peer peer identity this notification is about
6149 * @return GNUNET_OK to keep the connection open,
6150 * GNUNET_SYSERR to close it (signal serious error)
6152 * TODO: Check who we got this from, to validate route.
6155 handle_mesh_keepalive (void *cls, const struct GNUNET_PeerIdentity *peer,
6156 const struct GNUNET_MessageHeader *message)
6158 struct GNUNET_MESH_ConnectionKeepAlive *msg;
6159 struct MeshConnection *c;
6160 struct MeshPeer *neighbor;
6163 msg = (struct GNUNET_MESH_ConnectionKeepAlive *) message;
6164 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "got a keepalive packet from %s\n",
6167 c = connection_get (&msg->cid);
6170 GNUNET_STATISTICS_update (stats, "# keepalive on unknown connection", 1,
6175 fwd = GNUNET_MESSAGE_TYPE_MESH_FWD_KEEPALIVE == ntohs (message->type) ?
6176 GNUNET_YES : GNUNET_NO;
6178 /* Check if origin is as expected */
6179 neighbor = connection_get_hop (c, fwd);
6180 if (peer_get (peer)->id != neighbor->id)
6182 GNUNET_break_op (0);
6186 connection_change_state (c, MESH_CONNECTION_READY);
6187 connection_reset_timeout (c, fwd);
6189 if (connection_is_terminal (c, fwd))
6192 GNUNET_STATISTICS_update (stats, "# keepalives forwarded", 1, GNUNET_NO);
6193 send_prebuilt_message_connection (message, c, NULL, fwd);
6201 * Functions to handle messages from core
6203 static struct GNUNET_CORE_MessageHandler core_handlers[] = {
6204 {&handle_mesh_connection_create, GNUNET_MESSAGE_TYPE_MESH_CONNECTION_CREATE,
6206 {&handle_mesh_connection_ack, GNUNET_MESSAGE_TYPE_MESH_CONNECTION_ACK,
6207 sizeof (struct GNUNET_MESH_ConnectionACK)},
6208 {&handle_mesh_connection_broken, GNUNET_MESSAGE_TYPE_MESH_CONNECTION_BROKEN,
6209 sizeof (struct GNUNET_MESH_ConnectionBroken)},
6210 {&handle_mesh_connection_destroy, GNUNET_MESSAGE_TYPE_MESH_CONNECTION_DESTROY,
6211 sizeof (struct GNUNET_MESH_ConnectionDestroy)},
6212 {&handle_mesh_keepalive, GNUNET_MESSAGE_TYPE_MESH_FWD_KEEPALIVE,
6213 sizeof (struct GNUNET_MESH_ConnectionKeepAlive)},
6214 {&handle_mesh_keepalive, GNUNET_MESSAGE_TYPE_MESH_BCK_KEEPALIVE,
6215 sizeof (struct GNUNET_MESH_ConnectionKeepAlive)},
6216 {&handle_mesh_ack, GNUNET_MESSAGE_TYPE_MESH_ACK,
6217 sizeof (struct GNUNET_MESH_ACK)},
6218 {&handle_mesh_poll, GNUNET_MESSAGE_TYPE_MESH_POLL,
6219 sizeof (struct GNUNET_MESH_Poll)},
6220 {&handle_mesh_fwd, GNUNET_MESSAGE_TYPE_MESH_FWD, 0},
6221 {&handle_mesh_bck, GNUNET_MESSAGE_TYPE_MESH_BCK, 0},
6227 * Function to process paths received for a new peer addition. The recorded
6228 * paths form the initial tunnel, which can be optimized later.
6229 * Called on each result obtained for the DHT search.
6231 * @param cls closure
6232 * @param exp when will this value expire
6233 * @param key key of the result
6234 * @param get_path path of the get request
6235 * @param get_path_length lenght of get_path
6236 * @param put_path path of the put request
6237 * @param put_path_length length of the put_path
6238 * @param type type of the result
6239 * @param size number of bytes in data
6240 * @param data pointer to the result data
6243 dht_get_id_handler (void *cls, struct GNUNET_TIME_Absolute exp,
6244 const struct GNUNET_HashCode * key,
6245 const struct GNUNET_PeerIdentity *get_path,
6246 unsigned int get_path_length,
6247 const struct GNUNET_PeerIdentity *put_path,
6248 unsigned int put_path_length, enum GNUNET_BLOCK_Type type,
6249 size_t size, const void *data)
6251 struct MeshPeer *peer = cls;
6252 struct MeshPeerPath *p;
6253 struct MeshConnection *c;
6254 struct GNUNET_PeerIdentity pi;
6257 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got results from DHT!\n");
6258 GNUNET_PEER_resolve (peer->id, &pi);
6259 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " for %s\n", GNUNET_i2s (&pi));
6261 p = path_build_from_dht (get_path, get_path_length,
6262 put_path, put_path_length);
6263 path_add_to_peers (p, GNUNET_NO);
6266 /* Count connections */
6267 for (c = peer->tunnel->connection_head, i = 0; NULL != c; c = c->next, i++);
6269 /* If we already have 3 (or more (?!)) connections, it's enough */
6273 if (peer->tunnel->state == MESH_TUNNEL_SEARCHING)
6275 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ... connect!\n");
6276 peer_connect (peer);
6282 /******************************************************************************/
6283 /********************* MESH LOCAL HANDLES **************************/
6284 /******************************************************************************/
6288 * Handler for client connection.
6290 * @param cls Closure (unused).
6291 * @param client Client handler.
6294 handle_local_client_connect (void *cls, struct GNUNET_SERVER_Client *client)
6296 struct MeshClient *c;
6300 c = GNUNET_malloc (sizeof (struct MeshClient));
6302 c->id = next_client_id++; /* overflow not important: just for debug */
6303 GNUNET_SERVER_client_keep (client);
6304 GNUNET_SERVER_client_set_user_context (client, c);
6305 GNUNET_CONTAINER_DLL_insert (clients_head, clients_tail, c);
6310 * Handler for client disconnection
6312 * @param cls closure
6313 * @param client identification of the client; NULL
6314 * for the last call when the server is destroyed
6317 handle_local_client_disconnect (void *cls, struct GNUNET_SERVER_Client *client)
6319 struct MeshClient *c;
6321 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "client disconnected: %p\n", client);
6324 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " (SERVER DOWN)\n");
6328 c = client_get (client);
6331 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "matching client found (%u, %p)\n",
6333 GNUNET_SERVER_client_drop (c->handle);
6334 c->shutting_down = GNUNET_YES;
6335 if (NULL != c->own_channels)
6337 GNUNET_CONTAINER_multihashmap32_iterate (c->own_channels,
6338 &channel_destroy_iterator, c);
6339 GNUNET_CONTAINER_multihashmap32_destroy (c->own_channels);
6342 if (NULL != c->incoming_channels)
6344 GNUNET_CONTAINER_multihashmap32_iterate (c->incoming_channels,
6345 &channel_destroy_iterator, c);
6346 GNUNET_CONTAINER_multihashmap32_destroy (c->incoming_channels);
6349 if (NULL != c->ports)
6351 GNUNET_CONTAINER_multihashmap32_iterate (c->ports,
6352 &client_release_ports, c);
6353 GNUNET_CONTAINER_multihashmap32_destroy (c->ports);
6355 GNUNET_CONTAINER_DLL_remove (clients_head, clients_tail, c);
6356 GNUNET_STATISTICS_update (stats, "# clients", -1, GNUNET_NO);
6357 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " client free (%p)\n", c);
6362 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, " context NULL!\n");
6364 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "done!\n");
6370 * Handler for new clients
6372 * @param cls closure
6373 * @param client identification of the client
6374 * @param message the actual message, which includes messages the client wants
6377 handle_local_new_client (void *cls, struct GNUNET_SERVER_Client *client,
6378 const struct GNUNET_MessageHeader *message)
6380 struct GNUNET_MESH_ClientConnect *cc_msg;
6381 struct MeshClient *c;
6386 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "new client connected %p\n", client);
6388 /* Check data sanity */
6389 size = ntohs (message->size) - sizeof (struct GNUNET_MESH_ClientConnect);
6390 cc_msg = (struct GNUNET_MESH_ClientConnect *) message;
6391 if (0 != (size % sizeof (uint32_t)))
6394 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
6397 size /= sizeof (uint32_t);
6399 /* Initialize new client structure */
6400 c = GNUNET_SERVER_client_get_user_context (client, struct MeshClient);
6401 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " client id %u\n", c->id);
6402 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " client has %u ports\n", size);
6407 p = (uint32_t *) &cc_msg[1];
6408 c->ports = GNUNET_CONTAINER_multihashmap32_create (size);
6409 for (i = 0; i < size; i++)
6412 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " port: %u\n", u32);
6414 /* store in client's hashmap */
6415 GNUNET_CONTAINER_multihashmap32_put (c->ports, u32, c,
6416 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST);
6417 /* store in global hashmap */
6418 /* FIXME only allow one client to have the port open,
6419 * have a backup hashmap with waiting clients */
6420 GNUNET_CONTAINER_multihashmap32_put (ports, u32, c,
6421 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
6425 c->own_channels = GNUNET_CONTAINER_multihashmap32_create (32);
6426 c->incoming_channels = GNUNET_CONTAINER_multihashmap32_create (32);
6427 GNUNET_SERVER_notification_context_add (nc, client);
6428 GNUNET_STATISTICS_update (stats, "# clients", 1, GNUNET_NO);
6430 GNUNET_SERVER_receive_done (client, GNUNET_OK);
6431 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "new client processed\n");
6436 * Handler for requests of new tunnels
6438 * @param cls Closure.
6439 * @param client Identification of the client.
6440 * @param message The actual message.
6443 handle_local_channel_create (void *cls, struct GNUNET_SERVER_Client *client,
6444 const struct GNUNET_MessageHeader *message)
6446 struct GNUNET_MESH_ChannelMessage *msg;
6447 struct MeshPeer *peer;
6448 struct MeshTunnel2 *t;
6449 struct MeshChannel *ch;
6450 struct MeshClient *c;
6451 MESH_ChannelNumber chid;
6453 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "new channel requested\n");
6455 /* Sanity check for client registration */
6456 if (NULL == (c = client_get (client)))
6459 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
6462 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
6464 /* Message size sanity check */
6465 if (sizeof (struct GNUNET_MESH_ChannelMessage) != ntohs (message->size))
6468 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
6472 msg = (struct GNUNET_MESH_ChannelMessage *) message;
6473 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " towards %s:%u\n",
6474 GNUNET_i2s (&msg->peer), ntohl (msg->port));
6475 chid = ntohl (msg->channel_id);
6477 /* Sanity check for duplicate channel IDs */
6478 if (NULL != channel_get_by_local_id (c, chid))
6481 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
6485 peer = peer_get (&msg->peer);
6486 if (NULL == peer->tunnel)
6488 peer->tunnel = tunnel_new ();
6489 peer->tunnel->peer = peer;
6493 /* Create channel */
6494 ch = channel_new (t, c, chid);
6498 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
6501 ch->port = ntohl (msg->port);
6502 channel_set_options (ch, ntohl (msg->opt));
6504 /* In unreliable channels, we'll use the DLL to buffer data for the root */
6505 ch->root_rel = GNUNET_new (struct MeshChannelReliability);
6506 ch->root_rel->ch = ch;
6507 ch->root_rel->expected_delay = MESH_RETRANSMIT_TIME;
6509 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "CREATED CHANNEL %s[%x]:%u (%x)\n",
6510 peer2s (t->peer), ch->gid, ch->port, ch->lid_root);
6511 peer_connect (peer);
6513 /* Send create channel */
6515 struct GNUNET_MESH_ChannelCreate msgcc;
6517 msgcc.header.size = htons (sizeof (msgcc));
6518 msgcc.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE);
6519 msgcc.chid = htonl (ch->gid);
6520 msgcc.port = msg->port;
6521 msgcc.opt = msg->opt;
6523 tunnel_queue_data (t, ch, &msgcc.header, GNUNET_YES);
6526 GNUNET_SERVER_receive_done (client, GNUNET_OK);
6532 * Handler for requests of deleting tunnels
6534 * @param cls closure
6535 * @param client identification of the client
6536 * @param message the actual message
6539 handle_local_channel_destroy (void *cls, struct GNUNET_SERVER_Client *client,
6540 const struct GNUNET_MessageHeader *message)
6542 struct GNUNET_MESH_ChannelMessage *msg;
6543 struct MeshClient *c;
6544 struct MeshChannel *ch;
6545 struct MeshTunnel2 *t;
6546 MESH_ChannelNumber chid;
6548 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
6549 "Got a DESTROY CHANNEL from client!\n");
6551 /* Sanity check for client registration */
6552 if (NULL == (c = client_get (client)))
6555 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
6558 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
6560 /* Message sanity check */
6561 if (sizeof (struct GNUNET_MESH_ChannelMessage) != ntohs (message->size))
6564 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
6568 msg = (struct GNUNET_MESH_ChannelMessage *) message;
6570 /* Retrieve tunnel */
6571 chid = ntohl (msg->channel_id);
6572 ch = channel_get_by_local_id (c, chid);
6575 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, " channel %X not found\n", chid);
6577 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
6581 /* Cleanup after the tunnel */
6582 client_delete_channel (c, ch);
6583 if (c == ch->dest && GNUNET_MESH_LOCAL_CHANNEL_ID_SERV <= chid)
6587 else if (c == ch->root && GNUNET_MESH_LOCAL_CHANNEL_ID_SERV > chid)
6593 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
6594 " channel %X client %p (%p, %p)\n",
6595 chid, c, ch->root, ch->dest);
6600 channel_destroy (ch);
6601 tunnel_destroy_if_empty (t);
6603 GNUNET_SERVER_receive_done (client, GNUNET_OK);
6609 * Handler for client traffic
6611 * @param cls closure
6612 * @param client identification of the client
6613 * @param message the actual message
6616 handle_local_data (void *cls, struct GNUNET_SERVER_Client *client,
6617 const struct GNUNET_MessageHeader *message)
6619 struct GNUNET_MESH_LocalData *msg;
6620 struct MeshClient *c;
6621 struct MeshChannel *ch;
6622 struct MeshChannelReliability *rel;
6623 MESH_ChannelNumber chid;
6627 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
6628 "Got data from a client!\n");
6630 /* Sanity check for client registration */
6631 if (NULL == (c = client_get (client)))
6634 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
6637 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
6639 msg = (struct GNUNET_MESH_LocalData *) message;
6641 /* Sanity check for message size */
6642 size = ntohs (message->size) - sizeof (struct GNUNET_MESH_LocalData);
6643 if (size < sizeof (struct GNUNET_MessageHeader))
6646 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
6650 /* Channel exists? */
6651 chid = ntohl (msg->id);
6652 fwd = chid < GNUNET_MESH_LOCAL_CHANNEL_ID_SERV;
6653 ch = channel_get_by_local_id (c, chid);
6657 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
6661 /* Is the client in the channel? */
6664 ch->root->handle == client)
6668 ch->dest->handle == client) ) )
6671 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
6675 rel = fwd ? ch->root_rel : ch->dest_rel;
6676 rel->client_ready = GNUNET_NO;
6678 /* Ok, everything is correct, send the message. */
6680 struct GNUNET_MESH_Data *payload;
6681 uint16_t p2p_size = sizeof(struct GNUNET_MESH_Data) + size;
6682 unsigned char cbuf[p2p_size];
6684 payload = (struct GNUNET_MESH_Data *) cbuf;
6685 payload->mid = htonl (rel->mid_send);
6687 memcpy (&payload[1], &msg[1], size);
6688 payload->header.size = htons (p2p_size);
6689 payload->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_DATA);
6690 payload->chid = htonl (ch->gid);
6691 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " sending on channel...\n");
6692 send_prebuilt_message_channel (&payload->header, ch, fwd);
6694 if (GNUNET_YES == ch->reliable)
6695 channel_save_copy (ch, &payload->header, fwd);
6697 if (tunnel_get_buffer (ch->t, fwd) > 0)
6698 send_local_ack (ch, fwd);
6699 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "receive done OK\n");
6700 GNUNET_SERVER_receive_done (client, GNUNET_OK);
6707 * Handler for client's ACKs for payload traffic.
6709 * @param cls Closure (unused).
6710 * @param client Identification of the client.
6711 * @param message The actual message.
6714 handle_local_ack (void *cls, struct GNUNET_SERVER_Client *client,
6715 const struct GNUNET_MessageHeader *message)
6717 struct GNUNET_MESH_LocalAck *msg;
6718 struct MeshChannelReliability *rel;
6719 struct MeshChannel *ch;
6720 struct MeshClient *c;
6721 MESH_ChannelNumber chid;
6724 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got a local ACK\n");
6726 /* Sanity check for client registration */
6727 if (NULL == (c = client_get (client)))
6730 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
6733 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
6735 msg = (struct GNUNET_MESH_LocalAck *) message;
6737 /* Channel exists? */
6738 chid = ntohl (msg->channel_id);
6739 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " on channel %X\n", chid);
6740 ch = channel_get_by_local_id (c, chid);
6741 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " -- ch %p\n", ch);
6745 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Channel %X unknown.\n", chid);
6746 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, " for client %u.\n", c->id);
6747 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
6751 /* If client is root, the ACK is going FWD, therefore this is "BCK". */
6752 /* If client is dest, the ACK is going BCK, therefore this is "FWD" */
6753 fwd = chid >= GNUNET_MESH_LOCAL_CHANNEL_ID_SERV;
6754 rel = fwd ? ch->dest_rel : ch->root_rel;
6756 rel->client_ready = GNUNET_YES;
6757 channel_send_client_buffered_data (ch, c, fwd);
6758 send_ack (NULL, ch, fwd);
6760 GNUNET_SERVER_receive_done (client, GNUNET_OK);
6767 * Iterator over all tunnels to send a monitoring client info about each tunnel.
6769 * @param cls Closure (client handle).
6770 * @param key Key (hashed tunnel ID, unused).
6771 * @param value Tunnel info.
6773 * @return GNUNET_YES, to keep iterating.
6776 // monitor_all_tunnels_iterator (void *cls,
6777 // const struct GNUNET_HashCode * key,
6780 // struct GNUNET_SERVER_Client *client = cls;
6781 // struct MeshChannel *ch = value;
6782 // struct GNUNET_MESH_LocalMonitor *msg;
6784 // msg = GNUNET_malloc (sizeof(struct GNUNET_MESH_LocalMonitor));
6785 // msg->channel_id = htonl (ch->gid);
6786 // msg->header.size = htons (sizeof (struct GNUNET_MESH_LocalMonitor));
6787 // msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_TUNNELS);
6789 // GNUNET_log (GNUNET_ERROR_TYPE_INFO,
6790 // "* sending info about tunnel %s\n",
6791 // GNUNET_i2s (&msg->owner));
6793 // GNUNET_SERVER_notification_context_unicast (nc, client,
6794 // &msg->header, GNUNET_NO);
6795 // return GNUNET_YES;
6800 * Handler for client's MONITOR request.
6802 * @param cls Closure (unused).
6803 * @param client Identification of the client.
6804 * @param message The actual message.
6807 handle_local_get_tunnels (void *cls, struct GNUNET_SERVER_Client *client,
6808 const struct GNUNET_MessageHeader *message)
6810 struct MeshClient *c;
6812 /* Sanity check for client registration */
6813 if (NULL == (c = client_get (client)))
6816 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
6820 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
6821 "Received get tunnels request from client %u\n",
6823 // GNUNET_CONTAINER_multihashmap_iterate (tunnels,
6824 // monitor_all_tunnels_iterator,
6826 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
6827 "Get tunnels request from client %u completed\n",
6829 GNUNET_SERVER_receive_done (client, GNUNET_OK);
6834 * Handler for client's MONITOR_TUNNEL request.
6836 * @param cls Closure (unused).
6837 * @param client Identification of the client.
6838 * @param message The actual message.
6841 handle_local_show_tunnel (void *cls, struct GNUNET_SERVER_Client *client,
6842 const struct GNUNET_MessageHeader *message)
6844 const struct GNUNET_MESH_LocalMonitor *msg;
6845 struct GNUNET_MESH_LocalMonitor *resp;
6846 struct MeshClient *c;
6847 struct MeshChannel *ch;
6849 /* Sanity check for client registration */
6850 if (NULL == (c = client_get (client)))
6853 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
6857 msg = (struct GNUNET_MESH_LocalMonitor *) message;
6858 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
6859 "Received tunnel info request from client %u for tunnel %s[%X]\n",
6862 ntohl (msg->channel_id));
6863 // ch = channel_get (&msg->owner, ntohl (msg->channel_id));
6867 /* We don't know the tunnel */
6868 struct GNUNET_MESH_LocalMonitor warn;
6871 GNUNET_SERVER_notification_context_unicast (nc, client,
6874 GNUNET_SERVER_receive_done (client, GNUNET_OK);
6878 /* Initialize context */
6879 resp = GNUNET_malloc (sizeof (struct GNUNET_MESH_LocalMonitor));
6881 resp->header.size = htons (sizeof (struct GNUNET_MESH_LocalMonitor));
6882 GNUNET_SERVER_notification_context_unicast (nc, c->handle,
6883 &resp->header, GNUNET_NO);
6886 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
6887 "Monitor tunnel request from client %u completed\n",
6889 GNUNET_SERVER_receive_done (client, GNUNET_OK);
6894 * Functions to handle messages from clients
6896 static struct GNUNET_SERVER_MessageHandler client_handlers[] = {
6897 {&handle_local_new_client, NULL,
6898 GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT, 0},
6899 {&handle_local_channel_create, NULL,
6900 GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE,
6901 sizeof (struct GNUNET_MESH_ChannelMessage)},
6902 {&handle_local_channel_destroy, NULL,
6903 GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY,
6904 sizeof (struct GNUNET_MESH_ChannelMessage)},
6905 {&handle_local_data, NULL,
6906 GNUNET_MESSAGE_TYPE_MESH_LOCAL_DATA, 0},
6907 {&handle_local_ack, NULL,
6908 GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK,
6909 sizeof (struct GNUNET_MESH_LocalAck)},
6910 {&handle_local_get_tunnels, NULL,
6911 GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_TUNNELS,
6912 sizeof (struct GNUNET_MessageHeader)},
6913 {&handle_local_show_tunnel, NULL,
6914 GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_TUNNEL,
6915 sizeof (struct GNUNET_MESH_LocalMonitor)},
6921 * Method called whenever a given peer connects.
6923 * @param cls closure
6924 * @param peer peer identity this notification is about
6927 core_connect (void *cls, const struct GNUNET_PeerIdentity *peer)
6929 struct MeshPeer *pi;
6930 struct MeshPeerPath *path;
6932 DEBUG_CONN ("Peer connected\n");
6933 DEBUG_CONN (" %s\n", GNUNET_i2s (&my_full_id));
6934 pi = peer_get (peer);
6937 DEBUG_CONN (" (self)\n");
6938 path = path_new (1);
6942 DEBUG_CONN (" %s\n", GNUNET_i2s (peer));
6943 path = path_new (2);
6944 path->peers[1] = pi->id;
6945 GNUNET_PEER_change_rc (pi->id, 1);
6946 GNUNET_STATISTICS_update (stats, "# peers", 1, GNUNET_NO);
6948 path->peers[0] = myid;
6949 GNUNET_PEER_change_rc (myid, 1);
6950 peer_add_path (pi, path, GNUNET_YES);
6952 pi->connections = GNUNET_CONTAINER_multihashmap_create (32, GNUNET_YES);
6958 * Method called whenever a peer disconnects.
6960 * @param cls closure
6961 * @param peer peer identity this notification is about
6964 core_disconnect (void *cls, const struct GNUNET_PeerIdentity *peer)
6966 struct MeshPeer *pi;
6968 DEBUG_CONN ("Peer disconnected\n");
6969 pi = GNUNET_CONTAINER_multihashmap_get (peers, &peer->hashPubKey);
6976 peer_remove_path (pi, myid, pi->id);
6978 GNUNET_CONTAINER_multihashmap_iterate (pi->connections,
6981 GNUNET_CONTAINER_multihashmap_destroy (pi->connections);
6982 pi->connections = NULL;
6985 DEBUG_CONN (" (self)\n");
6987 GNUNET_STATISTICS_update (stats, "# peers", -1, GNUNET_NO);
6994 * Install server (service) handlers and start listening to clients.
6999 GNUNET_SERVER_add_handlers (server_handle, client_handlers);
7000 GNUNET_SERVER_connect_notify (server_handle,
7001 &handle_local_client_connect, NULL);
7002 GNUNET_SERVER_disconnect_notify (server_handle,
7003 &handle_local_client_disconnect, NULL);
7004 nc = GNUNET_SERVER_notification_context_create (server_handle, 1);
7006 clients_head = NULL;
7007 clients_tail = NULL;
7009 GNUNET_SERVER_resume (server_handle);
7014 * To be called on core init/fail.
7016 * @param cls Closure (config)
7017 * @param identity the public identity of this peer
7020 core_init (void *cls,
7021 const struct GNUNET_PeerIdentity *identity)
7023 const struct GNUNET_CONFIGURATION_Handle *c = cls;
7026 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Core init\n");
7027 if (0 != memcmp (identity, &my_full_id, sizeof (my_full_id)))
7029 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, _("Wrong CORE service\n"));
7030 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
7032 GNUNET_i2s (identity));
7033 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
7035 GNUNET_i2s (&my_full_id));
7036 GNUNET_CORE_disconnect (core_handle);
7037 core_handle = GNUNET_CORE_connect (c, /* Main configuration */
7038 NULL, /* Closure passed to MESH functions */
7039 &core_init, /* Call core_init once connected */
7040 &core_connect, /* Handle connects */
7041 &core_disconnect, /* remove peers on disconnects */
7042 NULL, /* Don't notify about all incoming messages */
7043 GNUNET_NO, /* For header only in notification */
7044 NULL, /* Don't notify about all outbound messages */
7045 GNUNET_NO, /* For header-only out notification */
7046 core_handlers); /* Register these handlers */
7055 /******************************************************************************/
7056 /************************ MAIN FUNCTIONS ****************************/
7057 /******************************************************************************/
7060 * Iterator over tunnel hash map entries to destroy the tunnel during shutdown.
7062 * @param cls closure
7063 * @param key current key code
7064 * @param value value in the hash map
7065 * @return GNUNET_YES if we should continue to iterate,
7069 shutdown_tunnel (void *cls, const struct GNUNET_HashCode * key, void *value)
7071 struct MeshPeer *p = value;
7072 struct MeshTunnel2 *t = p->tunnel;
7081 * Task run during shutdown.
7087 shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
7089 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "shutting down\n");
7091 if (core_handle != NULL)
7093 GNUNET_CORE_disconnect (core_handle);
7096 GNUNET_CONTAINER_multihashmap_iterate (peers, &shutdown_tunnel, NULL);
7097 if (dht_handle != NULL)
7099 GNUNET_DHT_disconnect (dht_handle);
7104 GNUNET_SERVER_notification_context_destroy (nc);
7107 if (GNUNET_SCHEDULER_NO_TASK != announce_id_task)
7109 GNUNET_SCHEDULER_cancel (announce_id_task);
7110 announce_id_task = GNUNET_SCHEDULER_NO_TASK;
7112 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "shut down\n");
7117 * Process mesh requests.
7119 * @param cls closure
7120 * @param server the initialized server
7121 * @param c configuration to use
7124 run (void *cls, struct GNUNET_SERVER_Handle *server,
7125 const struct GNUNET_CONFIGURATION_Handle *c)
7128 struct GNUNET_CRYPTO_EccPrivateKey *pk;
7130 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "starting to run\n");
7131 server_handle = server;
7132 GNUNET_SERVER_suspend (server_handle);
7135 GNUNET_CONFIGURATION_get_value_filename (c, "PEER", "PRIVATE_KEY",
7138 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
7140 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
7141 "mesh", "peer/privatekey");
7142 GNUNET_SCHEDULER_shutdown ();
7147 GNUNET_CONFIGURATION_get_value_time (c, "MESH", "REFRESH_CONNECTION_TIME",
7148 &refresh_connection_time))
7150 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
7152 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
7153 "mesh", "refresh path time");
7154 GNUNET_SCHEDULER_shutdown ();
7159 GNUNET_CONFIGURATION_get_value_time (c, "MESH", "ID_ANNOUNCE_TIME",
7162 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
7164 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
7165 "mesh", "id announce time");
7166 GNUNET_SCHEDULER_shutdown ();
7171 GNUNET_CONFIGURATION_get_value_time (c, "MESH", "CONNECT_TIMEOUT",
7174 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
7176 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
7177 "mesh", "connect timeout");
7178 GNUNET_SCHEDULER_shutdown ();
7183 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "MAX_MSGS_QUEUE",
7186 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
7188 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
7189 "mesh", "max msgs queue");
7190 GNUNET_SCHEDULER_shutdown ();
7195 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "MAX_CONNECTIONS",
7198 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
7200 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
7201 "mesh", "max tunnels");
7202 GNUNET_SCHEDULER_shutdown ();
7207 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "DEFAULT_TTL",
7210 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
7212 ("%s service is lacking key configuration settings (%s). Using default (%u).\n"),
7213 "mesh", "default ttl", 64);
7218 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "MAX_PEERS",
7221 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
7222 _("%s service is lacking key configuration settings (%s). Using default (%u).\n"),
7223 "mesh", "max peers", 1000);
7228 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "DROP_PERCENT",
7235 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
7236 "Mesh is running with drop mode enabled. "
7237 "This is NOT a good idea! "
7238 "Remove the DROP_PERCENT option from your configuration.\n");
7242 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "DHT_REPLICATION_LEVEL",
7243 &dht_replication_level))
7245 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
7247 ("%s service is lacking key configuration settings (%s). Using default (%u).\n"),
7248 "mesh", "dht replication level", 3);
7249 dht_replication_level = 3;
7252 connections = GNUNET_CONTAINER_multihashmap_create (32, GNUNET_YES);
7253 peers = GNUNET_CONTAINER_multihashmap_create (32, GNUNET_NO);
7254 ports = GNUNET_CONTAINER_multihashmap32_create (32);
7256 dht_handle = GNUNET_DHT_connect (c, 64);
7257 if (NULL == dht_handle)
7261 stats = GNUNET_STATISTICS_create ("mesh", c);
7263 /* Scheduled the task to clean up when shutdown is called */
7264 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &shutdown_task,
7266 pk = GNUNET_CRYPTO_ecc_key_create_from_file (keyfile);
7267 GNUNET_free (keyfile);
7268 GNUNET_assert (NULL != pk);
7269 my_private_key = pk;
7270 GNUNET_CRYPTO_ecc_key_get_public (my_private_key, &my_public_key);
7271 GNUNET_CRYPTO_hash (&my_public_key, sizeof (my_public_key),
7272 &my_full_id.hashPubKey);
7273 myid = GNUNET_PEER_intern (&my_full_id);
7274 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
7275 "Mesh for peer [%s] starting\n",
7276 GNUNET_i2s(&my_full_id));
7278 core_handle = GNUNET_CORE_connect (c, /* Main configuration */
7279 NULL, /* Closure passed to MESH functions */
7280 &core_init, /* Call core_init once connected */
7281 &core_connect, /* Handle connects */
7282 &core_disconnect, /* remove peers on disconnects */
7283 NULL, /* Don't notify about all incoming messages */
7284 GNUNET_NO, /* For header only in notification */
7285 NULL, /* Don't notify about all outbound messages */
7286 GNUNET_NO, /* For header-only out notification */
7287 core_handlers); /* Register these handlers */
7288 if (NULL == core_handle)
7291 GNUNET_SCHEDULER_shutdown ();
7294 announce_id_task = GNUNET_SCHEDULER_add_now (&announce_id, cls);
7295 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Mesh service running\n");
7300 * The main function for the mesh service.
7302 * @param argc number of arguments from the command line
7303 * @param argv command line arguments
7304 * @return 0 ok, 1 on error
7307 main (int argc, char *const *argv)
7312 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "main()\n");
7313 r = GNUNET_SERVICE_run (argc, argv, "mesh", GNUNET_SERVICE_OPTION_NONE, &run,
7315 ret = (GNUNET_OK == r) ? 0 : 1;
7316 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "main() END\n");