2 This file is part of GNUnet.
3 (C) 2011 Christian Grothoff (and other contributing authors)
4 GNUnet is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published
6 by the Free Software Foundation; either version 3, or (at your
7 option) any later version.
8 GNUnet is distributed in the hope that it will be useful, but
9 WITHOUT ANY WARRANTY; without even the implied warranty of
10 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 General Public License for more details.
12 You should have received a copy of the GNU General Public License
13 along with GNUnet; see the file COPYING. If not, write to the
14 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
15 Boston, MA 02111-1307, USA.
19 * @file mesh/mesh_api.c
20 * @brief mesh api: client implementation of mesh service
21 * @author Bartlomiej Polot
26 * - AUXILIARY FUNCTIONS
29 * - API CALL DEFINITIONS
34 #if 0 /* keep Emacsens' auto-indent happy */
40 #include "gnunet_common.h"
41 #include "gnunet_client_lib.h"
42 #include "gnunet_util_lib.h"
43 #include "gnunet_peer_lib.h"
44 #include "gnunet_mesh_service.h"
46 #include "mesh_protocol.h"
48 #define MESH_API_DEBUG GNUNET_YES
50 #define LOG(kind,...) GNUNET_log_from (kind, "mesh-api",__VA_ARGS__)
52 /******************************************************************************/
53 /************************ DATA STRUCTURES ****************************/
54 /******************************************************************************/
57 * Transmission queue to the service
59 struct GNUNET_MESH_TransmitHandle
65 struct GNUNET_MESH_TransmitHandle *next;
70 struct GNUNET_MESH_TransmitHandle *prev;
73 * Tunnel this message is sent on / for (may be NULL for control messages).
75 struct GNUNET_MESH_Tunnel *tunnel;
78 * Callback to obtain the message to transmit, or NULL if we
79 * got the message in 'data'. Notice that messages built
80 * by 'notify' need to be encapsulated with information about
83 GNUNET_CONNECTION_TransmitReadyNotify notify;
86 * Closure for 'notify'
91 * How long is this message valid. Once the timeout has been
92 * reached, the message must no longer be sent. If this
93 * is a message with a 'notify' callback set, the 'notify'
94 * function should be called with 'buf' NULL and size 0.
96 struct GNUNET_TIME_Absolute timeout;
99 * Task triggering a timeout, can be NO_TASK if the timeout is FOREVER.
101 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
104 * Priority of the message. The queue is sorted by priority,
105 * control messages have the maximum priority (UINT32_MAX).
110 * Target of the message, 0 for multicast. This field
111 * is only valid if 'notify' is non-NULL.
113 GNUNET_PEER_Id target;
116 * Size of 'data' -- or the desired size of 'notify' if 'data' is NULL.
123 * Opaque handle to the service.
125 struct GNUNET_MESH_Handle
129 * Handle to the server connection, to send messages later
131 struct GNUNET_CLIENT_Connection *client;
134 * Set of handlers used for processing incoming messages in the tunnels
136 const struct GNUNET_MESH_MessageHandler *message_handlers;
139 * Set of applications that should be claimed to be offered at this node.
140 * Note that this is just informative, the appropiate handlers must be
141 * registered independently and the mapping is up to the developer of the
142 * client application.
144 const GNUNET_MESH_ApplicationType *applications;
147 * Double linked list of the tunnels this client is connected to.
149 struct GNUNET_MESH_Tunnel *tunnels_head;
150 struct GNUNET_MESH_Tunnel *tunnels_tail;
153 * Callback for inbound tunnel creation
155 GNUNET_MESH_InboundTunnelNotificationHandler *new_tunnel;
158 * Callback for inbound tunnel disconnection
160 GNUNET_MESH_TunnelEndHandler *cleaner;
163 * Handle to cancel pending transmissions in case of disconnection
165 struct GNUNET_CLIENT_TransmitHandle *th;
168 * Closure for all the handlers given by the client
173 * Messages to send to the service
175 struct GNUNET_MESH_TransmitHandle *th_head;
176 struct GNUNET_MESH_TransmitHandle *th_tail;
179 * tid of the next tunnel to create (to avoid reusing IDs often)
181 MESH_TunnelNumber next_tid;
182 unsigned int n_handlers;
183 unsigned int n_applications;
184 unsigned int max_queue_size;
187 * Have we started the task to receive messages from the service
188 * yet? We do this after we send the 'MESH_LOCAL_CONNECT' message.
193 * Number of packets queued
195 unsigned int npackets;
198 * Configuration given by the client, in case of reconnection
200 const struct GNUNET_CONFIGURATION_Handle *cfg;
203 * Time to the next reconnect in case one reconnect fails
205 struct GNUNET_TIME_Relative reconnect_time;
210 * Description of a peer
212 struct GNUNET_MESH_Peer
215 * ID of the peer in short form
220 * Tunnel this peer belongs to
222 struct GNUNET_MESH_Tunnel *t;
225 * Flag indicating whether service has informed about its connection
233 * Opaque handle to a tunnel.
235 struct GNUNET_MESH_Tunnel
241 struct GNUNET_MESH_Tunnel *next;
242 struct GNUNET_MESH_Tunnel *prev;
245 * Callback to execute when peers connect to the tunnel
247 GNUNET_MESH_PeerConnectHandler connect_handler;
250 * Callback to execute when peers disconnect from the tunnel
252 GNUNET_MESH_PeerDisconnectHandler disconnect_handler;
255 * Closure for the connect/disconnect handlers
260 * Handle to the mesh this tunnel belongs to
262 struct GNUNET_MESH_Handle *mesh;
265 * Local ID of the tunnel
267 MESH_TunnelNumber tid;
270 * Owner of the tunnel. 0 if the tunnel is the local client.
272 GNUNET_PEER_Id owner;
275 * All peers added to the tunnel
277 struct GNUNET_MESH_Peer **peers;
280 * List of application types that have been requested for this tunnel
282 GNUNET_MESH_ApplicationType *apps;
285 * Any data the caller wants to put in here
290 * Number of peers added to the tunnel
295 * Number of packets queued in this tunnel
297 unsigned int npackets;
300 * Number of applications requested this tunnel
307 /******************************************************************************/
308 /*********************** AUXILIARY FUNCTIONS *************************/
309 /******************************************************************************/
312 * Get the tunnel handler for the tunnel specified by id from the given handle
313 * @param h Mesh handle
314 * @param tid ID of the wanted tunnel
315 * @return handle to the required tunnel or NULL if not found
317 static struct GNUNET_MESH_Tunnel *
318 retrieve_tunnel (struct GNUNET_MESH_Handle *h, MESH_TunnelNumber tid)
320 struct GNUNET_MESH_Tunnel *t;
334 * Create a new tunnel and insert it in the tunnel list of the mesh handle
335 * @param h Mesh handle
336 * @param tid desired tid of the tunnel, 0 to assign one automatically
337 * @return handle to the created tunnel
339 static struct GNUNET_MESH_Tunnel *
340 create_tunnel (struct GNUNET_MESH_Handle *h, MESH_TunnelNumber tid)
342 struct GNUNET_MESH_Tunnel *t;
344 t = GNUNET_malloc (sizeof (struct GNUNET_MESH_Tunnel));
345 GNUNET_CONTAINER_DLL_insert (h->tunnels_head, h->tunnels_tail, t);
349 t->tid = h->next_tid;
350 while (NULL != retrieve_tunnel (h, h->next_tid))
353 h->next_tid &= ~GNUNET_MESH_LOCAL_TUNNEL_ID_SERV;
354 h->next_tid |= GNUNET_MESH_LOCAL_TUNNEL_ID_CLI;
366 * Destroy the specified tunnel.
367 * - Destroys all peers, calling the disconnect callback on each if needed
368 * - Cancels all outgoing traffic for that tunnel, calling respective notifys
369 * - Calls cleaner if tunnel was inbound
370 * - Frees all memory used
372 * @param t Pointer to the tunnel.
373 * @param call_handler Whether to call the cleaner handler.
375 * @return Handle to the required tunnel or NULL if not found.
378 destroy_tunnel (struct GNUNET_MESH_Tunnel *t, int call_cleaner)
380 struct GNUNET_MESH_Handle *h;
381 struct GNUNET_PeerIdentity pi;
382 struct GNUNET_MESH_TransmitHandle *th;
383 struct GNUNET_MESH_TransmitHandle *next;
393 /* disconnect all peers */
394 GNUNET_CONTAINER_DLL_remove (h->tunnels_head, h->tunnels_tail, t);
395 for (i = 0; i < t->npeers; i++)
397 if ( (NULL != t->disconnect_handler) && t->peers[i]->connected)
399 GNUNET_PEER_resolve (t->peers[i]->id, &pi);
400 t->disconnect_handler (t->cls, &pi);
402 GNUNET_PEER_change_rc (t->peers[i]->id, -1);
403 GNUNET_free (t->peers[i]);
406 /* signal tunnel destruction */
407 if ( (NULL != h->cleaner) && (0 != t->owner) && (GNUNET_YES == call_cleaner) )
408 h->cleaner (h->cls, t, t->ctx);
410 /* check that clients did not leave messages behind in the queue */
411 for (th = h->th_head; NULL != th; th = next)
416 /* we should not really get here, as clients should have
417 aborted their requests already.
418 Management traffic should be ok, as clients can't cancel that */
419 GNUNET_break (NULL == th->notify);
420 GNUNET_CONTAINER_DLL_remove (h->th_head, h->th_tail, th);
422 /* clean up request */
423 if (GNUNET_SCHEDULER_NO_TASK != th->timeout_task)
424 GNUNET_SCHEDULER_cancel (th->timeout_task);
428 /* if there are no more pending requests with mesh service, cancel active request */
429 /* Note: this should be unnecessary... */
430 if ( (NULL == h->th_head) && (NULL != h->th))
432 GNUNET_CLIENT_notify_transmit_ready_cancel (h->th);
438 GNUNET_free (t->peers);
440 GNUNET_PEER_change_rc (t->owner, -1);
441 if (0 != t->napps && t->apps)
442 GNUNET_free (t->apps);
449 * Get the peer descriptor for the peer with id from the given tunnel
450 * @param t Tunnel handle
451 * @param id Short form ID of the wanted peer
452 * @return handle to the requested peer or NULL if not found
454 static struct GNUNET_MESH_Peer *
455 retrieve_peer (struct GNUNET_MESH_Tunnel *t, GNUNET_PEER_Id id)
459 for (i = 0; i < t->npeers; i++)
460 if (t->peers[i]->id == id)
467 * Add a peer into a tunnel
468 * @param t Tunnel handle
469 * @param pi Full ID of the new peer
470 * @return handle to the newly created peer
472 static struct GNUNET_MESH_Peer *
473 add_peer_to_tunnel (struct GNUNET_MESH_Tunnel *t,
474 const struct GNUNET_PeerIdentity *pi)
476 struct GNUNET_MESH_Peer *p;
484 id = GNUNET_PEER_intern (pi);
486 p = GNUNET_malloc (sizeof (struct GNUNET_MESH_Peer));
489 GNUNET_array_append (t->peers, t->npeers, p);
495 * Remove a peer from a tunnel
496 * @param p Peer handle
499 remove_peer_from_tunnel (struct GNUNET_MESH_Peer *p)
503 for (i = 0; i < p->t->npeers; i++)
505 if (p->t->peers[i] == p)
508 if (i == p->t->npeers)
513 p->t->peers[i] = p->t->peers[p->t->npeers - 1];
514 GNUNET_array_grow (p->t->peers, p->t->npeers, p->t->npeers - 1);
519 * Notify client that the transmission has timed out
521 * @param tc task context
524 timeout_transmission (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
526 struct GNUNET_MESH_TransmitHandle *th = cls;
527 struct GNUNET_MESH_Handle *mesh;
529 mesh = th->tunnel->mesh;
530 GNUNET_CONTAINER_DLL_remove (mesh->th_head, mesh->th_tail, th);
531 if (th->notify != NULL)
532 th->notify (th->notify_cls, 0, NULL);
534 if ((NULL == mesh->th_head) && (NULL != mesh->th))
536 /* queue empty, no point in asking for transmission */
537 GNUNET_CLIENT_notify_transmit_ready_cancel (mesh->th);
544 * Add a transmit handle to the transmission queue by priority and set the
547 * @param h mesh handle with the queue head and tail
548 * @param th handle to the packet to be transmitted
551 add_to_queue (struct GNUNET_MESH_Handle *h,
552 struct GNUNET_MESH_TransmitHandle *th)
554 struct GNUNET_MESH_TransmitHandle *p;
557 while ((NULL != p) && (th->priority <= p->priority))
563 GNUNET_CONTAINER_DLL_insert_after (h->th_head, h->th_tail, p, th);
564 if (GNUNET_TIME_UNIT_FOREVER_ABS.abs_value == th->timeout.abs_value)
567 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_absolute_get_remaining
568 (th->timeout), &timeout_transmission, th);
573 * Auxiliary function to send an already constructed packet to the service.
574 * Takes care of creating a new queue element, copying the message and
575 * calling the tmt_rdy function if necessary.
577 * @param h mesh handle
578 * @param msg message to transmit
579 * @param tunnel tunnel this send is related to (NULL if N/A)
582 send_packet (struct GNUNET_MESH_Handle *h,
583 const struct GNUNET_MessageHeader *msg,
584 struct GNUNET_MESH_Tunnel *tunnel);
588 * Reconnect callback: tries to reconnect again after a failer previous
590 * @param cls closure (mesh handle)
591 * @param tc task context
594 reconnect_cbk (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
598 * Send a connect packet to the service with the applications and types
599 * requested by the user.
601 * @param h The mesh handle.
605 send_connect (struct GNUNET_MESH_Handle *h)
609 size = sizeof (struct GNUNET_MESH_ClientConnect);
610 size += h->n_applications * sizeof (GNUNET_MESH_ApplicationType);
611 size += h->n_handlers * sizeof (uint16_t);
614 struct GNUNET_MESH_ClientConnect *msg;
615 GNUNET_MESH_ApplicationType *apps;
620 /* build connection packet */
621 msg = (struct GNUNET_MESH_ClientConnect *) buf;
622 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT);
623 msg->header.size = htons (size);
624 apps = (GNUNET_MESH_ApplicationType *) &msg[1];
625 for (napps = 0; napps < h->n_applications; napps++)
627 apps[napps] = htonl (h->applications[napps]);
628 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: app %u\n", h->applications[napps]);
630 types = (uint16_t *) & apps[napps];
631 for (ntypes = 0; ntypes < h->n_handlers; ntypes++)
632 types[ntypes] = htons (h->message_handlers[ntypes].type);
633 msg->applications = htons (napps);
634 msg->types = htons (ntypes);
636 LOG (GNUNET_ERROR_TYPE_DEBUG,
637 "mesh: Sending %lu bytes long message %d types and %d apps\n",
638 ntohs (msg->header.size), ntypes, napps);
640 send_packet (h, &msg->header, NULL);
646 * Reconnect to the service, retransmit all infomation to try to restore the
649 * @param h handle to the mesh
651 * @return GNUNET_YES in case of sucess, GNUNET_NO otherwise (service down...)
654 reconnect (struct GNUNET_MESH_Handle *h)
656 struct GNUNET_MESH_Tunnel *t;
660 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: *****************************\n");
661 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: ******* RECONNECT *******\n");
662 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: *****************************\n");
664 h->in_receive = GNUNET_NO;
668 GNUNET_CLIENT_notify_transmit_ready_cancel (h->th);
671 if (NULL != h->client)
673 GNUNET_CLIENT_disconnect (h->client, GNUNET_NO);
677 h->client = GNUNET_CLIENT_connect ("mesh", h->cfg);
678 if (h->client == NULL)
680 GNUNET_SCHEDULER_add_delayed (h->reconnect_time, &reconnect_cbk, h);
682 GNUNET_TIME_relative_min (GNUNET_TIME_UNIT_SECONDS,
683 GNUNET_TIME_relative_multiply
684 (h->reconnect_time, 2));
685 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: Next retry in %sms\n",
686 GNUNET_TIME_relative_to_string (h->reconnect_time));
692 h->reconnect_time = GNUNET_TIME_UNIT_MILLISECONDS;
695 /* Rebuild all tunnels */
696 for (t = h->tunnels_head; NULL != t; t = t->next)
698 struct GNUNET_MESH_TunnelMessage tmsg;
699 struct GNUNET_MESH_PeerControl pmsg;
701 if (t->tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
703 /* Tunnel was created by service (incoming tunnel) */
704 /* TODO: Notify service of missing tunnel, to request
705 * creator to recreate path (find a path to him via DHT?)
709 tmsg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE);
710 tmsg.header.size = htons (sizeof (struct GNUNET_MESH_TunnelMessage));
711 tmsg.tunnel_id = htonl (t->tid);
712 send_packet (h, &tmsg.header, t);
714 pmsg.header.size = htons (sizeof (struct GNUNET_MESH_PeerControl));
715 pmsg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD);
716 pmsg.tunnel_id = htonl (t->tid);
718 /* Reconnect all peers */
719 for (i = 0; i < t->npeers; i++)
721 GNUNET_PEER_resolve (t->peers[i]->id, &pmsg.peer);
722 if (NULL != t->disconnect_handler && t->peers[i]->connected)
723 t->disconnect_handler (t->cls, &pmsg.peer);
724 /* If the tunnel was "by type", dont connect individual peers */
726 send_packet (t->mesh, &pmsg.header, t);
728 /* Reconnect all types, if any */
729 for (i = 0; i < t->napps; i++)
731 struct GNUNET_MESH_ConnectPeerByType msg;
733 msg.header.size = htons (sizeof (struct GNUNET_MESH_ConnectPeerByType));
734 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD_BY_TYPE);
735 msg.tunnel_id = htonl (t->tid);
736 msg.type = htonl (t->apps[i]);
737 send_packet (t->mesh, &msg.header, t);
744 * Reconnect callback: tries to reconnect again after a failer previous
746 * @param cls closure (mesh handle)
747 * @param tc task context
750 reconnect_cbk (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
752 struct GNUNET_MESH_Handle *h = cls;
754 if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN)
760 /******************************************************************************/
761 /*********************** RECEIVE HANDLERS ****************************/
762 /******************************************************************************/
765 * Process the new tunnel notification and add it to the tunnels in the handle
767 * @param h The mesh handle
768 * @param msg A message with the details of the new incoming tunnel
771 process_tunnel_created (struct GNUNET_MESH_Handle *h,
772 const struct GNUNET_MESH_TunnelNotification *msg)
774 struct GNUNET_MESH_Tunnel *t;
775 MESH_TunnelNumber tid;
777 tid = ntohl (msg->tunnel_id);
778 if (tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
783 t = create_tunnel (h, tid);
784 t->owner = GNUNET_PEER_intern (&msg->peer);
786 t->peers = GNUNET_malloc (sizeof (struct GNUNET_MESH_Peer *));
787 t->peers[0] = GNUNET_malloc (sizeof (struct GNUNET_MESH_Peer));
789 t->peers[0]->connected = 1;
790 t->peers[0]->id = t->owner;
791 GNUNET_PEER_change_rc (t->owner, 1);
794 if (NULL != h->new_tunnel)
796 struct GNUNET_ATS_Information atsi;
800 t->ctx = h->new_tunnel (h->cls, t, &msg->peer, &atsi);
803 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: new incoming tunnel %X\n",
811 * Process the tunnel destroy notification and free associated resources
813 * @param h The mesh handle
814 * @param msg A message with the details of the tunnel being destroyed
817 process_tunnel_destroy (struct GNUNET_MESH_Handle *h,
818 const struct GNUNET_MESH_TunnelMessage *msg)
820 struct GNUNET_MESH_Tunnel *t;
821 MESH_TunnelNumber tid;
823 tid = ntohl (msg->tunnel_id);
824 t = retrieve_tunnel (h, tid);
835 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: tunnel %u destroyed\n", t->tid);
837 destroy_tunnel (t, GNUNET_YES);
843 * Process the new peer event and notify the upper level of it
845 * @param h The mesh handle
846 * @param msg A message with the details of the peer event
849 process_peer_event (struct GNUNET_MESH_Handle *h,
850 const struct GNUNET_MESH_PeerControl *msg)
852 struct GNUNET_MESH_Tunnel *t;
853 struct GNUNET_MESH_Peer *p;
854 struct GNUNET_ATS_Information atsi;
858 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: processig peer event\n");
859 size = ntohs (msg->header.size);
860 if (size != sizeof (struct GNUNET_MESH_PeerControl))
865 t = retrieve_tunnel (h, ntohl (msg->tunnel_id));
871 id = GNUNET_PEER_search (&msg->peer);
872 if ((p = retrieve_peer (t, id)) == NULL)
873 p = add_peer_to_tunnel (t, &msg->peer);
874 if (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD == ntohs (msg->header.type))
876 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: adding peer\n");
877 if (NULL != t->connect_handler)
881 t->connect_handler (t->cls, &msg->peer, &atsi);
887 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: removing peer\n");
888 if (NULL != t->disconnect_handler && p->connected)
890 t->disconnect_handler (t->cls, &msg->peer);
892 remove_peer_from_tunnel (p);
895 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: processing peer event END\n");
900 * Process the incoming data packets
902 * @param h The mesh handle
903 * @param message A message encapsulating the data
905 * @return GNUNET_YES if everything went fine
906 * GNUNET_NO if client closed connection (h no longer valid)
909 process_incoming_data (struct GNUNET_MESH_Handle *h,
910 const struct GNUNET_MessageHeader *message)
912 const struct GNUNET_MessageHeader *payload;
913 const struct GNUNET_MESH_MessageHandler *handler;
914 const struct GNUNET_PeerIdentity *peer;
915 struct GNUNET_MESH_Unicast *ucast;
916 struct GNUNET_MESH_Multicast *mcast;
917 struct GNUNET_MESH_ToOrigin *to_orig;
918 struct GNUNET_MESH_Tunnel *t;
922 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: Got a data message!\n");
923 type = ntohs (message->type);
926 case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
927 ucast = (struct GNUNET_MESH_Unicast *) message;
929 t = retrieve_tunnel (h, ntohl (ucast->tid));
930 payload = (struct GNUNET_MessageHeader *) &ucast[1];
932 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: ucast on tunnel %s [%x]\n",
933 GNUNET_i2s (peer), ntohl (ucast->tid));
935 case GNUNET_MESSAGE_TYPE_MESH_MULTICAST:
936 mcast = (struct GNUNET_MESH_Multicast *) message;
937 t = retrieve_tunnel (h, ntohl (mcast->tid));
938 payload = (struct GNUNET_MessageHeader *) &mcast[1];
940 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: mcast on tunnel %s [%x]\n",
941 GNUNET_i2s (peer), ntohl (mcast->tid));
943 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
944 to_orig = (struct GNUNET_MESH_ToOrigin *) message;
945 t = retrieve_tunnel (h, ntohl (to_orig->tid));
946 payload = (struct GNUNET_MessageHeader *) &to_orig[1];
947 peer = &to_orig->sender;
948 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: torig on tunnel %s [%x]\n",
949 GNUNET_i2s (peer), ntohl (to_orig->tid));
960 type = ntohs (payload->type);
961 for (i = 0; i < h->n_handlers; i++)
963 handler = &h->message_handlers[i];
964 if (handler->type == type)
966 struct GNUNET_ATS_Information atsi;
971 handler->callback (h->cls, t, &t->ctx, peer, payload, &atsi))
973 LOG (GNUNET_ERROR_TYPE_DEBUG, "MESH: callback caused disconnection\n");
974 GNUNET_MESH_disconnect (h);
980 LOG (GNUNET_ERROR_TYPE_DEBUG,
981 "MESH: callback completed successfully\n");
992 * Function to process all messages received from the service
995 * @param msg message received, NULL on timeout or fatal error
998 msg_received (void *cls, const struct GNUNET_MessageHeader *msg)
1000 struct GNUNET_MESH_Handle *h = cls;
1007 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: received a message type %hu from MESH\n",
1009 switch (ntohs (msg->type))
1011 /* Notify of a new incoming tunnel */
1012 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE:
1013 process_tunnel_created (h, (struct GNUNET_MESH_TunnelNotification *) msg);
1015 /* Notify of a tunnel disconnection */
1016 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY:
1017 process_tunnel_destroy (h, (struct GNUNET_MESH_TunnelMessage *) msg);
1019 /* Notify of a new peer or a peer disconnect in the tunnel */
1020 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD:
1021 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_DEL:
1022 process_peer_event (h, (struct GNUNET_MESH_PeerControl *) msg);
1024 /* Notify of a new data packet in the tunnel */
1025 case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
1026 case GNUNET_MESSAGE_TYPE_MESH_MULTICAST:
1027 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
1028 if (GNUNET_NO == process_incoming_data (h, msg))
1031 /* We shouldn't get any other packages, log and ignore */
1033 LOG (GNUNET_ERROR_TYPE_WARNING,
1034 "MESH: unsolicited message form service (type %d)\n",
1037 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: message processed\n");
1038 GNUNET_CLIENT_receive (h->client, &msg_received, h,
1039 GNUNET_TIME_UNIT_FOREVER_REL);
1043 /******************************************************************************/
1044 /************************ SEND FUNCTIONS ****************************/
1045 /******************************************************************************/
1048 * Function called to send a message to the service.
1049 * "buf" will be NULL and "size" zero if the socket was closed for writing in
1052 * @param cls closure, the mesh handle
1053 * @param size number of bytes available in buf
1054 * @param buf where the callee should write the connect message
1055 * @return number of bytes written to buf
1058 send_callback (void *cls, size_t size, void *buf)
1060 struct GNUNET_MESH_Handle *h = cls;
1061 struct GNUNET_MESH_TransmitHandle *th;
1066 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: Send packet() Buffer %u\n", size);
1068 if ((0 == size) || (NULL == buf))
1074 while ((NULL != (th = h->th_head)) && (size >= th->size))
1076 if (NULL != th->notify)
1078 if (th->tunnel->tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
1080 /* traffic to origin */
1081 struct GNUNET_MESH_ToOrigin to;
1082 struct GNUNET_MessageHeader *mh;
1084 GNUNET_assert (size >= th->size);
1085 mh = (struct GNUNET_MessageHeader *) &cbuf[sizeof (to)];
1086 psize = th->notify (th->notify_cls, size - sizeof (to), mh);
1087 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: to origin, type %u\n",
1091 psize += sizeof (to);
1092 GNUNET_assert (size >= psize);
1093 to.header.size = htons (psize);
1094 to.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN);
1095 to.tid = htonl (th->tunnel->tid);
1096 memset (&to.oid, 0, sizeof (struct GNUNET_PeerIdentity));
1097 memset (&to.sender, 0, sizeof (struct GNUNET_PeerIdentity));
1098 memcpy (cbuf, &to, sizeof (to));
1101 else if (th->target == 0)
1104 struct GNUNET_MESH_Multicast mc;
1105 struct GNUNET_MessageHeader *mh;
1107 GNUNET_assert (size >= th->size);
1108 mh = (struct GNUNET_MessageHeader *) &cbuf[sizeof (mc)];
1109 psize = th->notify (th->notify_cls, size - sizeof (mc), mh);
1110 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: multicast, type %u\n",
1114 psize += sizeof (mc);
1115 GNUNET_assert (size >= psize);
1116 mc.header.size = htons (psize);
1117 mc.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_MULTICAST);
1118 mc.tid = htonl (th->tunnel->tid);
1121 memset (&mc.oid, 0, sizeof (struct GNUNET_PeerIdentity));
1122 memcpy (cbuf, &mc, sizeof (mc));
1128 struct GNUNET_MESH_Unicast uc;
1129 struct GNUNET_MessageHeader *mh;
1131 GNUNET_assert (size >= th->size);
1132 mh = (struct GNUNET_MessageHeader *) &cbuf[sizeof (uc)];
1133 psize = th->notify (th->notify_cls, size - sizeof (uc), mh);
1134 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: unicast, type %u\n",
1138 psize += sizeof (uc);
1139 GNUNET_assert (size >= psize);
1140 uc.header.size = htons (psize);
1141 uc.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_UNICAST);
1142 uc.tid = htonl (th->tunnel->tid);
1143 memset (&uc.oid, 0, sizeof (struct GNUNET_PeerIdentity));
1144 GNUNET_PEER_resolve (th->target, &uc.destination);
1145 memcpy (cbuf, &uc, sizeof (uc));
1151 memcpy (cbuf, &th[1], th->size);
1154 if (th->timeout_task != GNUNET_SCHEDULER_NO_TASK)
1155 GNUNET_SCHEDULER_cancel (th->timeout_task);
1156 if (NULL != th->notify)
1158 th->tunnel->mesh->npackets--;
1159 th->tunnel->npackets--;
1161 GNUNET_CONTAINER_DLL_remove (h->th_head, h->th_tail, th);
1167 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: total size: %u\n", tsize);
1168 if (NULL != (th = h->th_head))
1170 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: next size: %u\n", th->size);
1173 GNUNET_CLIENT_notify_transmit_ready (h->client, th->size,
1174 GNUNET_TIME_UNIT_FOREVER_REL,
1175 GNUNET_YES, &send_callback, h);
1177 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: Send packet() END\n");
1178 if (GNUNET_NO == h->in_receive)
1180 h->in_receive = GNUNET_YES;
1181 GNUNET_CLIENT_receive (h->client, &msg_received, h,
1182 GNUNET_TIME_UNIT_FOREVER_REL);
1189 * Auxiliary function to send an already constructed packet to the service.
1190 * Takes care of creating a new queue element, copying the message and
1191 * calling the tmt_rdy function if necessary.
1193 * @param h mesh handle
1194 * @param msg message to transmit
1195 * @param tunnel tunnel this send is related to (NULL if N/A)
1198 send_packet (struct GNUNET_MESH_Handle *h,
1199 const struct GNUNET_MessageHeader *msg,
1200 struct GNUNET_MESH_Tunnel *tunnel)
1202 struct GNUNET_MESH_TransmitHandle *th;
1205 msize = ntohs (msg->size);
1206 th = GNUNET_malloc (sizeof (struct GNUNET_MESH_TransmitHandle) + msize);
1207 th->priority = UINT32_MAX;
1208 th->timeout = GNUNET_TIME_UNIT_FOREVER_ABS;
1210 th->tunnel = tunnel;
1211 memcpy (&th[1], msg, msize);
1212 add_to_queue (h, th);
1216 GNUNET_CLIENT_notify_transmit_ready (h->client, msize,
1217 GNUNET_TIME_UNIT_FOREVER_REL,
1218 GNUNET_YES, &send_callback, h);
1222 /******************************************************************************/
1223 /********************** API CALL DEFINITIONS *************************/
1224 /******************************************************************************/
1227 * Connect to the mesh service.
1229 * @param cfg configuration to use
1230 * @param queue_size size of the data message queue, shared among all tunnels
1231 * (each tunnel is guaranteed to accept at least one message,
1232 * no matter what is the status of other tunnels)
1233 * @param cls closure for the various callbacks that follow
1234 * (including handlers in the handlers array)
1235 * @param new_tunnel function called when an *inbound* tunnel is created
1236 * @param cleaner function called when an *inbound* tunnel is destroyed by the
1237 * remote peer, it is *not* called if GNUNET_MESH_tunnel_destroy
1238 * is called on the tunnel
1239 * @param handlers callbacks for messages we care about, NULL-terminated
1240 * note that the mesh is allowed to drop notifications about
1241 * inbound messages if the client does not process them fast
1242 * enough (for this notification type, a bounded queue is used)
1243 * @param stypes list of the applications that this client claims to provide
1244 * @return handle to the mesh service NULL on error
1245 * (in this case, init is never called)
1247 struct GNUNET_MESH_Handle *
1248 GNUNET_MESH_connect (const struct GNUNET_CONFIGURATION_Handle *cfg,
1249 unsigned int queue_size, void *cls,
1250 GNUNET_MESH_InboundTunnelNotificationHandler new_tunnel,
1251 GNUNET_MESH_TunnelEndHandler cleaner,
1252 const struct GNUNET_MESH_MessageHandler *handlers,
1253 const GNUNET_MESH_ApplicationType *stypes)
1255 struct GNUNET_MESH_Handle *h;
1257 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: GNUNET_MESH_connect()\n");
1258 h = GNUNET_malloc (sizeof (struct GNUNET_MESH_Handle));
1260 h->max_queue_size = queue_size;
1261 h->new_tunnel = new_tunnel;
1262 h->cleaner = cleaner;
1263 h->client = GNUNET_CLIENT_connect ("mesh", cfg);
1264 if (h->client == NULL)
1272 h->applications = stypes;
1273 h->message_handlers = handlers;
1274 h->next_tid = GNUNET_MESH_LOCAL_TUNNEL_ID_CLI;
1275 h->reconnect_time = GNUNET_TIME_UNIT_MILLISECONDS;
1277 /* count handlers and apps, calculate size */
1278 for (h->n_applications = 0; stypes[h->n_applications]; h->n_applications++) ;
1279 for (h->n_handlers = 0; handlers[h->n_handlers].type; h->n_handlers++) ;
1281 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: GNUNET_MESH_connect() END\n");
1287 * Disconnect from the mesh service. All tunnels will be destroyed. All tunnel
1288 * disconnect callbacks will be called on any still connected peers, notifying
1289 * about their disconnection. The registered inbound tunnel cleaner will be
1290 * called should any inbound tunnels still exist.
1292 * @param handle connection to mesh to disconnect
1295 GNUNET_MESH_disconnect (struct GNUNET_MESH_Handle *handle)
1297 struct GNUNET_MESH_Tunnel *t;
1298 struct GNUNET_MESH_Tunnel *aux;
1299 struct GNUNET_MESH_TransmitHandle *th;
1301 t = handle->tunnels_head;
1305 if (t->tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
1309 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: tunnel %X not destroyed\n",
1313 destroy_tunnel (t, GNUNET_YES);
1316 while ( (th = handle->th_head) != NULL)
1318 struct GNUNET_MessageHeader *msg;
1320 /* Make sure it is an allowed packet (everything else should have been
1321 * already canceled).
1323 GNUNET_break (UINT32_MAX == th->priority);
1324 GNUNET_break (NULL == th->notify);
1325 msg = (struct GNUNET_MessageHeader *) &th[1];
1326 switch (ntohs(msg->type))
1328 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT:
1329 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY:
1334 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: unexpected msg %u\n",
1339 GNUNET_CONTAINER_DLL_remove (handle->th_head, handle->th_tail, th);
1343 if (NULL != handle->th)
1345 GNUNET_CLIENT_notify_transmit_ready_cancel (handle->th);
1348 if (NULL != handle->client)
1350 GNUNET_CLIENT_disconnect (handle->client, GNUNET_NO);
1351 handle->client = NULL;
1353 GNUNET_free (handle);
1358 * Create a new tunnel (we're initiator and will be allowed to add/remove peers
1359 * and to broadcast).
1361 * @param h mesh handle
1362 * @param tunnel_ctx client's tunnel context to associate with the tunnel
1363 * @param connect_handler function to call when peers are actually connected
1364 * @param disconnect_handler function to call when peers are disconnected
1365 * @param handler_cls closure for connect/disconnect handlers
1367 struct GNUNET_MESH_Tunnel *
1368 GNUNET_MESH_tunnel_create (struct GNUNET_MESH_Handle *h, void *tunnel_ctx,
1369 GNUNET_MESH_PeerConnectHandler connect_handler,
1370 GNUNET_MESH_PeerDisconnectHandler disconnect_handler,
1373 struct GNUNET_MESH_Tunnel *t;
1374 struct GNUNET_MESH_TunnelMessage msg;
1376 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: Creating new tunnel\n");
1377 t = create_tunnel (h, 0);
1378 t->connect_handler = connect_handler;
1379 t->disconnect_handler = disconnect_handler;
1380 t->cls = handler_cls;
1381 t->ctx = tunnel_ctx;
1382 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE);
1383 msg.header.size = htons (sizeof (struct GNUNET_MESH_TunnelMessage));
1384 msg.tunnel_id = htonl (t->tid);
1385 send_packet (h, &msg.header, t);
1391 * Destroy an existing tunnel. The existing callback for the tunnel will NOT
1394 * @param tunnel tunnel handle
1397 GNUNET_MESH_tunnel_destroy (struct GNUNET_MESH_Tunnel *tunnel)
1399 struct GNUNET_MESH_Handle *h;
1400 struct GNUNET_MESH_TunnelMessage msg;
1401 struct GNUNET_MESH_TransmitHandle *th;
1403 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: Destroying tunnel\n");
1406 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY);
1407 msg.header.size = htons (sizeof (struct GNUNET_MESH_TunnelMessage));
1408 msg.tunnel_id = htonl (tunnel->tid);
1412 struct GNUNET_MESH_TransmitHandle *aux;
1413 if (th->tunnel == tunnel)
1416 /* FIXME call the handler? */
1417 if (NULL != th->notify)
1418 th->notify (th->notify_cls, 0, NULL);
1419 GNUNET_CONTAINER_DLL_remove (h->th_head, h->th_tail, th);
1427 destroy_tunnel (tunnel, GNUNET_NO);
1428 send_packet (h, &msg.header, tunnel);
1433 * Request that a peer should be added to the tunnel. The existing
1434 * connect handler will be called ONCE with either success or failure.
1435 * This function should NOT be called again with the same peer before the
1436 * connect handler is called.
1438 * @param tunnel handle to existing tunnel
1439 * @param peer peer to add
1442 GNUNET_MESH_peer_request_connect_add (struct GNUNET_MESH_Tunnel *tunnel,
1443 const struct GNUNET_PeerIdentity *peer)
1445 struct GNUNET_MESH_PeerControl msg;
1446 GNUNET_PEER_Id peer_id;
1449 peer_id = GNUNET_PEER_intern (peer);
1450 for (i = 0; i < tunnel->npeers; i++)
1452 if (tunnel->peers[i]->id == peer_id)
1454 /* Peer already exists in tunnel */
1455 GNUNET_PEER_change_rc (peer_id, -1);
1460 if (NULL == add_peer_to_tunnel (tunnel, peer))
1463 msg.header.size = htons (sizeof (struct GNUNET_MESH_PeerControl));
1464 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD);
1465 msg.tunnel_id = htonl (tunnel->tid);
1467 send_packet (tunnel->mesh, &msg.header, tunnel);
1474 * Request that a peer should be removed from the tunnel. The existing
1475 * disconnect handler will be called ONCE if we were connected.
1477 * @param tunnel handle to existing tunnel
1478 * @param peer peer to remove
1481 GNUNET_MESH_peer_request_connect_del (struct GNUNET_MESH_Tunnel *tunnel,
1482 const struct GNUNET_PeerIdentity *peer)
1484 struct GNUNET_MESH_PeerControl msg;
1485 GNUNET_PEER_Id peer_id;
1488 peer_id = GNUNET_PEER_search (peer);
1494 for (i = 0; i < tunnel->npeers; i++)
1495 if (tunnel->peers[i]->id == peer_id)
1497 if (i == tunnel->npeers)
1502 if (NULL != tunnel->disconnect_handler && tunnel->peers[i]->connected == 1)
1503 tunnel->disconnect_handler (tunnel->cls, peer);
1504 GNUNET_PEER_change_rc (peer_id, -1);
1505 GNUNET_free (tunnel->peers[i]);
1506 tunnel->peers[i] = tunnel->peers[tunnel->npeers - 1];
1507 GNUNET_array_grow (tunnel->peers, tunnel->npeers, tunnel->npeers - 1);
1509 msg.header.size = htons (sizeof (struct GNUNET_MESH_PeerControl));
1510 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_DEL);
1511 msg.tunnel_id = htonl (tunnel->tid);
1512 memcpy (&msg.peer, peer, sizeof (struct GNUNET_PeerIdentity));
1513 send_packet (tunnel->mesh, &msg.header, tunnel);
1518 * Request that the mesh should try to connect to a peer supporting the given
1521 * @param tunnel handle to existing tunnel
1522 * @param app_type application type that must be supported by the peer (MESH
1523 * should discover peer in proximity handling this type)
1526 GNUNET_MESH_peer_request_connect_by_type (struct GNUNET_MESH_Tunnel *tunnel,
1527 GNUNET_MESH_ApplicationType app_type)
1529 struct GNUNET_MESH_ConnectPeerByType msg;
1531 GNUNET_array_append (tunnel->apps, tunnel->napps, app_type);
1533 msg.header.size = htons (sizeof (struct GNUNET_MESH_ConnectPeerByType));
1534 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD_BY_TYPE);
1535 msg.tunnel_id = htonl (tunnel->tid);
1536 msg.type = htonl (app_type);
1537 send_packet (tunnel->mesh, &msg.header, tunnel);
1542 * Ask the mesh to call "notify" once it is ready to transmit the
1543 * given number of bytes to the specified "target". If we are not yet
1544 * connected to the specified peer, a call to this function will cause
1545 * us to try to establish a connection.
1547 * @param tunnel tunnel to use for transmission
1548 * @param cork is corking allowed for this transmission?
1549 * @param priority how important is the message?
1550 * @param maxdelay how long can the message wait?
1551 * @param target destination for the message,
1552 * NULL for multicast to all tunnel targets
1553 * @param notify_size how many bytes of buffer space does notify want?
1554 * @param notify function to call when buffer space is available;
1555 * will be called with NULL on timeout or if the overall queue
1556 * for this peer is larger than queue_size and this is currently
1557 * the message with the lowest priority
1558 * @param notify_cls closure for notify
1559 * @return non-NULL if the notify callback was queued,
1560 * NULL if we can not even queue the request (insufficient
1561 * memory); if NULL is returned, "notify" will NOT be called.
1563 struct GNUNET_MESH_TransmitHandle *
1564 GNUNET_MESH_notify_transmit_ready (struct GNUNET_MESH_Tunnel *tunnel, int cork,
1566 struct GNUNET_TIME_Relative maxdelay,
1567 const struct GNUNET_PeerIdentity *target,
1569 GNUNET_CONNECTION_TransmitReadyNotify notify,
1572 struct GNUNET_MESH_TransmitHandle *th;
1573 struct GNUNET_MESH_TransmitHandle *least_priority_th;
1574 uint32_t least_priority;
1577 GNUNET_assert (NULL != tunnel);
1579 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1580 "mesh: mesh notify transmit ready called\n");
1582 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: target %s\n",
1583 GNUNET_i2s (target));
1585 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: target multicast\n");
1587 GNUNET_assert (NULL != notify);
1588 if (tunnel->mesh->npackets >= tunnel->mesh->max_queue_size &&
1589 tunnel->npackets > 0)
1594 th = tunnel->mesh->th_tail;
1595 least_priority = priority;
1596 least_priority_th = NULL;
1599 if (th->priority < least_priority && th->tunnel->npackets > 1)
1601 least_priority_th = th;
1602 least_priority = th->priority;
1606 if (NULL == least_priority_th)
1608 /* Can't be a control message */
1609 GNUNET_assert (NULL != least_priority_th->notify);
1610 least_priority_th->notify (notify_cls, 0, NULL);
1611 least_priority_th->tunnel->npackets--;
1612 tunnel->mesh->npackets--;
1613 GNUNET_CONTAINER_DLL_remove (tunnel->mesh->th_head, tunnel->mesh->th_tail,
1615 if (GNUNET_SCHEDULER_NO_TASK != least_priority_th->timeout_task)
1616 GNUNET_SCHEDULER_cancel (least_priority_th->timeout_task);
1617 GNUNET_free (least_priority_th);
1620 tunnel->mesh->npackets++;
1621 th = GNUNET_malloc (sizeof (struct GNUNET_MESH_TransmitHandle));
1622 th->tunnel = tunnel;
1623 th->priority = priority;
1624 th->timeout = GNUNET_TIME_relative_to_absolute (maxdelay);
1625 th->target = GNUNET_PEER_intern (target);
1626 if (tunnel->tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
1627 overhead = sizeof (struct GNUNET_MESH_ToOrigin);
1628 else if (NULL == target)
1629 overhead = sizeof (struct GNUNET_MESH_Multicast);
1631 overhead = sizeof (struct GNUNET_MESH_Unicast);
1632 th->size = notify_size + overhead;
1633 th->notify = notify;
1634 th->notify_cls = notify_cls;
1635 add_to_queue (tunnel->mesh, th);
1636 if (NULL != tunnel->mesh->th)
1639 GNUNET_CLIENT_notify_transmit_ready (tunnel->mesh->client, th->size,
1640 GNUNET_TIME_UNIT_FOREVER_REL,
1641 GNUNET_YES, &send_callback,
1648 * Cancel the specified transmission-ready notification.
1650 * @param th handle that was returned by "notify_transmit_ready".
1653 GNUNET_MESH_notify_transmit_ready_cancel (struct GNUNET_MESH_TransmitHandle *th)
1655 struct GNUNET_MESH_Handle *mesh;
1657 mesh = th->tunnel->mesh;
1658 if (th->timeout_task != GNUNET_SCHEDULER_NO_TASK)
1659 GNUNET_SCHEDULER_cancel (th->timeout_task);
1660 GNUNET_CONTAINER_DLL_remove (mesh->th_head, mesh->th_tail, th);
1662 if ((NULL == mesh->th_head) && (NULL != mesh->th))
1664 /* queue empty, no point in asking for transmission */
1665 GNUNET_CLIENT_notify_transmit_ready_cancel (mesh->th);
1672 * Transition API for tunnel ctx management
1675 GNUNET_MESH_tunnel_set_data (struct GNUNET_MESH_Tunnel *tunnel, void *data)
1681 * Transition API for tunnel ctx management
1684 GNUNET_MESH_tunnel_get_data (struct GNUNET_MESH_Tunnel *tunnel)
1690 #if 0 /* keep Emacsens' auto-indent happy */