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
51 #define LOG(kind,...) GNUNET_log_from (kind, "mesh-api",__VA_ARGS__)
56 /******************************************************************************/
57 /************************ DATA STRUCTURES ****************************/
58 /******************************************************************************/
61 * Transmission queue to the service
63 struct GNUNET_MESH_TransmitHandle
69 struct GNUNET_MESH_TransmitHandle *next;
74 struct GNUNET_MESH_TransmitHandle *prev;
77 * Tunnel this message is sent on / for (may be NULL for control messages).
79 struct GNUNET_MESH_Tunnel *tunnel;
82 * Callback to obtain the message to transmit, or NULL if we
83 * got the message in 'data'. Notice that messages built
84 * by 'notify' need to be encapsulated with information about
87 GNUNET_CONNECTION_TransmitReadyNotify notify;
90 * Closure for 'notify'
95 * How long is this message valid. Once the timeout has been
96 * reached, the message must no longer be sent. If this
97 * is a message with a 'notify' callback set, the 'notify'
98 * function should be called with 'buf' NULL and size 0.
100 struct GNUNET_TIME_Absolute timeout;
103 * Task triggering a timeout, can be NO_TASK if the timeout is FOREVER.
105 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
108 * Priority of the message. The queue is sorted by priority,
109 * control messages have the maximum priority (UINT32_MAX).
114 * Target of the message, 0 for multicast. This field
115 * is only valid if 'notify' is non-NULL.
117 GNUNET_PEER_Id target;
120 * Size of 'data' -- or the desired size of 'notify' if 'data' is NULL.
127 * Opaque handle to the service.
129 struct GNUNET_MESH_Handle
133 * Handle to the server connection, to send messages later
135 struct GNUNET_CLIENT_Connection *client;
138 * Set of handlers used for processing incoming messages in the tunnels
140 const struct GNUNET_MESH_MessageHandler *message_handlers;
143 * Set of applications that should be claimed to be offered at this node.
144 * Note that this is just informative, the appropiate handlers must be
145 * registered independently and the mapping is up to the developer of the
146 * client application.
148 const GNUNET_MESH_ApplicationType *applications;
151 * Double linked list of the tunnels this client is connected to.
153 struct GNUNET_MESH_Tunnel *tunnels_head;
154 struct GNUNET_MESH_Tunnel *tunnels_tail;
157 * Callback for inbound tunnel creation
159 GNUNET_MESH_InboundTunnelNotificationHandler *new_tunnel;
162 * Callback for inbound tunnel disconnection
164 GNUNET_MESH_TunnelEndHandler *cleaner;
167 * Handle to cancel pending transmissions in case of disconnection
169 struct GNUNET_CLIENT_TransmitHandle *th;
172 * Closure for all the handlers given by the client
177 * Messages to send to the service
179 struct GNUNET_MESH_TransmitHandle *th_head;
180 struct GNUNET_MESH_TransmitHandle *th_tail;
183 * tid of the next tunnel to create (to avoid reusing IDs often)
185 MESH_TunnelNumber next_tid;
186 unsigned int n_handlers;
187 unsigned int n_applications;
188 unsigned int max_queue_size;
191 * Have we started the task to receive messages from the service
192 * yet? We do this after we send the 'MESH_LOCAL_CONNECT' message.
197 * Number of packets queued
199 unsigned int npackets;
202 * Configuration given by the client, in case of reconnection
204 const struct GNUNET_CONFIGURATION_Handle *cfg;
207 * Time to the next reconnect in case one reconnect fails
209 struct GNUNET_TIME_Relative reconnect_time;
214 * Description of a peer
216 struct GNUNET_MESH_Peer
219 * ID of the peer in short form
224 * Tunnel this peer belongs to
226 struct GNUNET_MESH_Tunnel *t;
229 * Flag indicating whether service has informed about its connection
237 * Opaque handle to a tunnel.
239 struct GNUNET_MESH_Tunnel
245 struct GNUNET_MESH_Tunnel *next;
246 struct GNUNET_MESH_Tunnel *prev;
249 * Callback to execute when peers connect to the tunnel
251 GNUNET_MESH_PeerConnectHandler connect_handler;
254 * Callback to execute when peers disconnect from the tunnel
256 GNUNET_MESH_PeerDisconnectHandler disconnect_handler;
259 * Closure for the connect/disconnect handlers
264 * Handle to the mesh this tunnel belongs to
266 struct GNUNET_MESH_Handle *mesh;
269 * Local ID of the tunnel
271 MESH_TunnelNumber tid;
274 * Owner of the tunnel. 0 if the tunnel is the local client.
276 GNUNET_PEER_Id owner;
279 * All peers added to the tunnel
281 struct GNUNET_MESH_Peer **peers;
284 * List of application types that have been requested for this tunnel
286 GNUNET_MESH_ApplicationType *apps;
289 * Any data the caller wants to put in here
294 * Number of peers added to the tunnel
299 * Number of packets queued in this tunnel
301 unsigned int npackets;
304 * Number of applications requested this tunnel
311 /******************************************************************************/
312 /*********************** AUXILIARY FUNCTIONS *************************/
313 /******************************************************************************/
316 * Get the tunnel handler for the tunnel specified by id from the given handle
317 * @param h Mesh handle
318 * @param tid ID of the wanted tunnel
319 * @return handle to the required tunnel or NULL if not found
321 static struct GNUNET_MESH_Tunnel *
322 retrieve_tunnel (struct GNUNET_MESH_Handle *h, MESH_TunnelNumber tid)
324 struct GNUNET_MESH_Tunnel *t;
338 * Create a new tunnel and insert it in the tunnel list of the mesh handle
339 * @param h Mesh handle
340 * @param tid desired tid of the tunnel, 0 to assign one automatically
341 * @return handle to the created tunnel
343 static struct GNUNET_MESH_Tunnel *
344 create_tunnel (struct GNUNET_MESH_Handle *h, MESH_TunnelNumber tid)
346 struct GNUNET_MESH_Tunnel *t;
348 t = GNUNET_malloc (sizeof (struct GNUNET_MESH_Tunnel));
349 GNUNET_CONTAINER_DLL_insert (h->tunnels_head, h->tunnels_tail, t);
353 t->tid = h->next_tid;
354 while (NULL != retrieve_tunnel (h, h->next_tid))
357 h->next_tid &= ~GNUNET_MESH_LOCAL_TUNNEL_ID_SERV;
358 h->next_tid |= GNUNET_MESH_LOCAL_TUNNEL_ID_CLI;
370 * Destroy the specified tunnel.
371 * - Destroys all peers, calling the disconnect callback on each if needed
372 * - Cancels all outgoing traffic for that tunnel, calling respective notifys
373 * - Calls cleaner if tunnel was inbound
374 * - Frees all memory used
376 * @param t Pointer to the tunnel.
377 * @param call_handler Whether to call the cleaner handler.
379 * @return Handle to the required tunnel or NULL if not found.
382 destroy_tunnel (struct GNUNET_MESH_Tunnel *t, int call_cleaner)
384 struct GNUNET_MESH_Handle *h;
385 struct GNUNET_PeerIdentity pi;
386 struct GNUNET_MESH_TransmitHandle *th;
387 struct GNUNET_MESH_TransmitHandle *next;
397 /* disconnect all peers */
398 GNUNET_CONTAINER_DLL_remove (h->tunnels_head, h->tunnels_tail, t);
399 for (i = 0; i < t->npeers; i++)
401 if ( (NULL != t->disconnect_handler) && t->peers[i]->connected)
403 GNUNET_PEER_resolve (t->peers[i]->id, &pi);
404 t->disconnect_handler (t->cls, &pi);
406 GNUNET_PEER_change_rc (t->peers[i]->id, -1);
407 GNUNET_free (t->peers[i]);
410 /* signal tunnel destruction */
411 if ( (NULL != h->cleaner) && (0 != t->owner) && (GNUNET_YES == call_cleaner) )
412 h->cleaner (h->cls, t, t->ctx);
414 /* check that clients did not leave messages behind in the queue */
415 for (th = h->th_head; NULL != th; th = next)
420 /* we should not really get here, as clients should have
421 aborted their requests already.
422 Management traffic should be ok, as clients can't cancel that */
423 GNUNET_break (NULL == th->notify);
424 GNUNET_CONTAINER_DLL_remove (h->th_head, h->th_tail, th);
426 /* clean up request */
427 if (GNUNET_SCHEDULER_NO_TASK != th->timeout_task)
428 GNUNET_SCHEDULER_cancel (th->timeout_task);
432 /* if there are no more pending requests with mesh service, cancel active request */
433 /* Note: this should be unnecessary... */
434 if ( (NULL == h->th_head) && (NULL != h->th))
436 GNUNET_CLIENT_notify_transmit_ready_cancel (h->th);
442 GNUNET_free (t->peers);
444 GNUNET_PEER_change_rc (t->owner, -1);
445 if (0 != t->napps && t->apps)
446 GNUNET_free (t->apps);
453 * Get the peer descriptor for the peer with id from the given tunnel
454 * @param t Tunnel handle
455 * @param id Short form ID of the wanted peer
456 * @return handle to the requested peer or NULL if not found
458 static struct GNUNET_MESH_Peer *
459 retrieve_peer (struct GNUNET_MESH_Tunnel *t, GNUNET_PEER_Id id)
463 for (i = 0; i < t->npeers; i++)
464 if (t->peers[i]->id == id)
471 * Add a peer into a tunnel
472 * @param t Tunnel handle
473 * @param pi Full ID of the new peer
474 * @return handle to the newly created peer
476 static struct GNUNET_MESH_Peer *
477 add_peer_to_tunnel (struct GNUNET_MESH_Tunnel *t,
478 const struct GNUNET_PeerIdentity *pi)
480 struct GNUNET_MESH_Peer *p;
488 id = GNUNET_PEER_intern (pi);
490 p = GNUNET_malloc (sizeof (struct GNUNET_MESH_Peer));
493 GNUNET_array_append (t->peers, t->npeers, p);
499 * Remove a peer from a tunnel
500 * @param p Peer handle
503 remove_peer_from_tunnel (struct GNUNET_MESH_Peer *p)
507 for (i = 0; i < p->t->npeers; i++)
509 if (p->t->peers[i] == p)
512 if (i == p->t->npeers)
517 p->t->peers[i] = p->t->peers[p->t->npeers - 1];
518 GNUNET_array_grow (p->t->peers, p->t->npeers, p->t->npeers - 1);
523 * Notify client that the transmission has timed out
525 * @param tc task context
528 timeout_transmission (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
530 struct GNUNET_MESH_TransmitHandle *th = cls;
531 struct GNUNET_MESH_Handle *mesh;
533 mesh = th->tunnel->mesh;
534 GNUNET_CONTAINER_DLL_remove (mesh->th_head, mesh->th_tail, th);
535 if (th->notify != NULL)
536 th->notify (th->notify_cls, 0, NULL);
538 if ((NULL == mesh->th_head) && (NULL != mesh->th))
540 /* queue empty, no point in asking for transmission */
541 GNUNET_CLIENT_notify_transmit_ready_cancel (mesh->th);
548 * Add a transmit handle to the transmission queue by priority and set the
551 * @param h mesh handle with the queue head and tail
552 * @param th handle to the packet to be transmitted
555 add_to_queue (struct GNUNET_MESH_Handle *h,
556 struct GNUNET_MESH_TransmitHandle *th)
558 struct GNUNET_MESH_TransmitHandle *p;
561 while ((NULL != p) && (th->priority <= p->priority))
567 GNUNET_CONTAINER_DLL_insert_after (h->th_head, h->th_tail, p, th);
568 if (GNUNET_TIME_UNIT_FOREVER_ABS.abs_value == th->timeout.abs_value)
571 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_absolute_get_remaining
572 (th->timeout), &timeout_transmission, th);
577 * Auxiliary function to send an already constructed packet to the service.
578 * Takes care of creating a new queue element, copying the message and
579 * calling the tmt_rdy function if necessary.
581 * @param h mesh handle
582 * @param msg message to transmit
583 * @param tunnel tunnel this send is related to (NULL if N/A)
586 send_packet (struct GNUNET_MESH_Handle *h,
587 const struct GNUNET_MessageHeader *msg,
588 struct GNUNET_MESH_Tunnel *tunnel);
592 * Reconnect callback: tries to reconnect again after a failer previous
594 * @param cls closure (mesh handle)
595 * @param tc task context
598 reconnect_cbk (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
602 * Send a connect packet to the service with the applications and types
603 * requested by the user.
605 * @param h The mesh handle.
609 send_connect (struct GNUNET_MESH_Handle *h)
613 size = sizeof (struct GNUNET_MESH_ClientConnect);
614 size += h->n_applications * sizeof (GNUNET_MESH_ApplicationType);
615 size += h->n_handlers * sizeof (uint16_t);
618 struct GNUNET_MESH_ClientConnect *msg;
619 GNUNET_MESH_ApplicationType *apps;
624 /* build connection packet */
625 msg = (struct GNUNET_MESH_ClientConnect *) buf;
626 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT);
627 msg->header.size = htons (size);
628 apps = (GNUNET_MESH_ApplicationType *) &msg[1];
629 for (napps = 0; napps < h->n_applications; napps++)
631 apps[napps] = htonl (h->applications[napps]);
632 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: app %u\n", h->applications[napps]);
634 types = (uint16_t *) & apps[napps];
635 for (ntypes = 0; ntypes < h->n_handlers; ntypes++)
636 types[ntypes] = htons (h->message_handlers[ntypes].type);
637 msg->applications = htons (napps);
638 msg->types = htons (ntypes);
639 LOG (GNUNET_ERROR_TYPE_DEBUG,
640 "mesh: Sending %lu bytes long message %d types and %d apps\n",
641 ntohs (msg->header.size), ntypes, napps);
642 send_packet (h, &msg->header, NULL);
648 * Reconnect to the service, retransmit all infomation to try to restore the
651 * @param h handle to the mesh
653 * @return GNUNET_YES in case of sucess, GNUNET_NO otherwise (service down...)
656 reconnect (struct GNUNET_MESH_Handle *h)
658 struct GNUNET_MESH_Tunnel *t;
661 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: *****************************\n");
662 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: ******* RECONNECT *******\n");
663 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: *****************************\n");
665 h->in_receive = GNUNET_NO;
669 GNUNET_CLIENT_notify_transmit_ready_cancel (h->th);
672 if (NULL != h->client)
674 GNUNET_CLIENT_disconnect (h->client, GNUNET_NO);
678 h->client = GNUNET_CLIENT_connect ("mesh", h->cfg);
679 if (h->client == NULL)
681 GNUNET_SCHEDULER_add_delayed (h->reconnect_time, &reconnect_cbk, h);
683 GNUNET_TIME_relative_min (GNUNET_TIME_UNIT_SECONDS,
684 GNUNET_TIME_relative_multiply
685 (h->reconnect_time, 2));
686 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: Next retry in %sms\n",
687 GNUNET_TIME_relative_to_string (h->reconnect_time));
693 h->reconnect_time = GNUNET_TIME_UNIT_MILLISECONDS;
696 /* Rebuild all tunnels */
697 for (t = h->tunnels_head; NULL != t; t = t->next)
699 struct GNUNET_MESH_TunnelMessage tmsg;
700 struct GNUNET_MESH_PeerControl pmsg;
702 if (t->tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
704 /* Tunnel was created by service (incoming tunnel) */
705 /* TODO: Notify service of missing tunnel, to request
706 * creator to recreate path (find a path to him via DHT?)
710 tmsg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE);
711 tmsg.header.size = htons (sizeof (struct GNUNET_MESH_TunnelMessage));
712 tmsg.tunnel_id = htonl (t->tid);
713 send_packet (h, &tmsg.header, t);
715 pmsg.header.size = htons (sizeof (struct GNUNET_MESH_PeerControl));
716 pmsg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD);
717 pmsg.tunnel_id = htonl (t->tid);
719 /* Reconnect all peers */
720 for (i = 0; i < t->npeers; i++)
722 GNUNET_PEER_resolve (t->peers[i]->id, &pmsg.peer);
723 if (NULL != t->disconnect_handler && t->peers[i]->connected)
724 t->disconnect_handler (t->cls, &pmsg.peer);
725 /* If the tunnel was "by type", dont connect individual peers */
727 send_packet (t->mesh, &pmsg.header, t);
729 /* Reconnect all types, if any */
730 for (i = 0; i < t->napps; i++)
732 struct GNUNET_MESH_ConnectPeerByType msg;
734 msg.header.size = htons (sizeof (struct GNUNET_MESH_ConnectPeerByType));
735 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD_BY_TYPE);
736 msg.tunnel_id = htonl (t->tid);
737 msg.type = htonl (t->apps[i]);
738 send_packet (t->mesh, &msg.header, t);
745 * Reconnect callback: tries to reconnect again after a failer previous
747 * @param cls closure (mesh handle)
748 * @param tc task context
751 reconnect_cbk (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
753 struct GNUNET_MESH_Handle *h = cls;
755 if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN)
761 /******************************************************************************/
762 /*********************** RECEIVE HANDLERS ****************************/
763 /******************************************************************************/
766 * Process the new tunnel notification and add it to the tunnels in the handle
768 * @param h The mesh handle
769 * @param msg A message with the details of the new incoming tunnel
772 process_tunnel_created (struct GNUNET_MESH_Handle *h,
773 const struct GNUNET_MESH_TunnelNotification *msg)
775 struct GNUNET_MESH_Tunnel *t;
776 MESH_TunnelNumber tid;
778 tid = ntohl (msg->tunnel_id);
779 if (tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
784 t = create_tunnel (h, tid);
785 t->owner = GNUNET_PEER_intern (&msg->peer);
787 t->peers = GNUNET_malloc (sizeof (struct GNUNET_MESH_Peer *));
788 t->peers[0] = GNUNET_malloc (sizeof (struct GNUNET_MESH_Peer));
790 t->peers[0]->connected = 1;
791 t->peers[0]->id = t->owner;
792 GNUNET_PEER_change_rc (t->owner, 1);
795 if (NULL != h->new_tunnel)
797 struct GNUNET_ATS_Information atsi;
801 t->ctx = h->new_tunnel (h->cls, t, &msg->peer, &atsi);
803 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: new incoming tunnel %X\n", t->tid);
809 * Process the tunnel destroy notification and free associated resources
811 * @param h The mesh handle
812 * @param msg A message with the details of the tunnel being destroyed
815 process_tunnel_destroy (struct GNUNET_MESH_Handle *h,
816 const struct GNUNET_MESH_TunnelMessage *msg)
818 struct GNUNET_MESH_Tunnel *t;
819 MESH_TunnelNumber tid;
821 tid = ntohl (msg->tunnel_id);
822 t = retrieve_tunnel (h, tid);
832 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: tunnel %u destroyed\n", t->tid);
833 destroy_tunnel (t, GNUNET_YES);
839 * Process the new peer event and notify the upper level of it
841 * @param h The mesh handle
842 * @param msg A message with the details of the peer event
845 process_peer_event (struct GNUNET_MESH_Handle *h,
846 const struct GNUNET_MESH_PeerControl *msg)
848 struct GNUNET_MESH_Tunnel *t;
849 struct GNUNET_MESH_Peer *p;
850 struct GNUNET_ATS_Information atsi;
854 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: processig peer event\n");
855 size = ntohs (msg->header.size);
856 if (size != sizeof (struct GNUNET_MESH_PeerControl))
861 t = retrieve_tunnel (h, ntohl (msg->tunnel_id));
867 id = GNUNET_PEER_search (&msg->peer);
868 if ((p = retrieve_peer (t, id)) == NULL)
869 p = add_peer_to_tunnel (t, &msg->peer);
870 if (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD == ntohs (msg->header.type))
872 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: adding peer\n");
873 if (NULL != t->connect_handler)
877 t->connect_handler (t->cls, &msg->peer, &atsi);
883 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: removing peer\n");
884 if (NULL != t->disconnect_handler && p->connected)
886 t->disconnect_handler (t->cls, &msg->peer);
888 remove_peer_from_tunnel (p);
891 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: processing peer event END\n");
896 * Process the incoming data packets
898 * @param h The mesh handle
899 * @param message A message encapsulating the data
901 * @return GNUNET_YES if everything went fine
902 * GNUNET_NO if client closed connection (h no longer valid)
905 process_incoming_data (struct GNUNET_MESH_Handle *h,
906 const struct GNUNET_MessageHeader *message)
908 const struct GNUNET_MessageHeader *payload;
909 const struct GNUNET_MESH_MessageHandler *handler;
910 const struct GNUNET_PeerIdentity *peer;
911 struct GNUNET_MESH_Unicast *ucast;
912 struct GNUNET_MESH_Multicast *mcast;
913 struct GNUNET_MESH_ToOrigin *to_orig;
914 struct GNUNET_MESH_Tunnel *t;
918 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: Got a data message!\n");
919 type = ntohs (message->type);
922 case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
923 ucast = (struct GNUNET_MESH_Unicast *) message;
925 t = retrieve_tunnel (h, ntohl (ucast->tid));
926 payload = (struct GNUNET_MessageHeader *) &ucast[1];
928 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: ucast on tunnel %s [%x]\n",
929 GNUNET_i2s (peer), ntohl (ucast->tid));
931 case GNUNET_MESSAGE_TYPE_MESH_MULTICAST:
932 mcast = (struct GNUNET_MESH_Multicast *) message;
933 t = retrieve_tunnel (h, ntohl (mcast->tid));
934 payload = (struct GNUNET_MessageHeader *) &mcast[1];
936 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: mcast on tunnel %s [%x]\n",
937 GNUNET_i2s (peer), ntohl (mcast->tid));
939 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
940 to_orig = (struct GNUNET_MESH_ToOrigin *) message;
941 t = retrieve_tunnel (h, ntohl (to_orig->tid));
942 payload = (struct GNUNET_MessageHeader *) &to_orig[1];
943 peer = &to_orig->sender;
944 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: torig on tunnel %s [%x]\n",
945 GNUNET_i2s (peer), ntohl (to_orig->tid));
956 type = ntohs (payload->type);
957 for (i = 0; i < h->n_handlers; i++)
959 handler = &h->message_handlers[i];
960 if (handler->type == type)
962 struct GNUNET_ATS_Information atsi;
967 handler->callback (h->cls, t, &t->ctx, peer, payload, &atsi))
969 LOG (GNUNET_ERROR_TYPE_DEBUG, "MESH: callback caused disconnection\n");
970 GNUNET_MESH_disconnect (h);
975 LOG (GNUNET_ERROR_TYPE_DEBUG,
976 "MESH: callback completed successfully\n");
986 * Function to process all messages received from the service
989 * @param msg message received, NULL on timeout or fatal error
992 msg_received (void *cls, const struct GNUNET_MessageHeader *msg)
994 struct GNUNET_MESH_Handle *h = cls;
1001 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: received a message type %hu from MESH\n",
1003 switch (ntohs (msg->type))
1005 /* Notify of a new incoming tunnel */
1006 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE:
1007 process_tunnel_created (h, (struct GNUNET_MESH_TunnelNotification *) msg);
1009 /* Notify of a tunnel disconnection */
1010 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY:
1011 process_tunnel_destroy (h, (struct GNUNET_MESH_TunnelMessage *) msg);
1013 /* Notify of a new peer or a peer disconnect in the tunnel */
1014 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD:
1015 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_DEL:
1016 process_peer_event (h, (struct GNUNET_MESH_PeerControl *) msg);
1018 /* Notify of a new data packet in the tunnel */
1019 case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
1020 case GNUNET_MESSAGE_TYPE_MESH_MULTICAST:
1021 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
1022 if (GNUNET_NO == process_incoming_data (h, msg))
1025 /* We shouldn't get any other packages, log and ignore */
1027 LOG (GNUNET_ERROR_TYPE_WARNING,
1028 "MESH: unsolicited message form service (type %d)\n",
1031 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: message processed\n");
1032 GNUNET_CLIENT_receive (h->client, &msg_received, h,
1033 GNUNET_TIME_UNIT_FOREVER_REL);
1037 /******************************************************************************/
1038 /************************ SEND FUNCTIONS ****************************/
1039 /******************************************************************************/
1042 * Function called to send a message to the service.
1043 * "buf" will be NULL and "size" zero if the socket was closed for writing in
1046 * @param cls closure, the mesh handle
1047 * @param size number of bytes available in buf
1048 * @param buf where the callee should write the connect message
1049 * @return number of bytes written to buf
1052 send_callback (void *cls, size_t size, void *buf)
1054 struct GNUNET_MESH_Handle *h = cls;
1055 struct GNUNET_MESH_TransmitHandle *th;
1060 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: Send packet() Buffer %u\n", size);
1062 if ((0 == size) || (NULL == buf))
1068 while ((NULL != (th = h->th_head)) && (size >= th->size))
1070 if (NULL != th->notify)
1072 if (th->tunnel->tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
1074 /* traffic to origin */
1075 struct GNUNET_MESH_ToOrigin to;
1076 struct GNUNET_MessageHeader *mh;
1078 GNUNET_assert (size >= th->size);
1079 mh = (struct GNUNET_MessageHeader *) &cbuf[sizeof (to)];
1080 psize = th->notify (th->notify_cls, size - sizeof (to), mh);
1081 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: to origin, type %u\n",
1085 psize += sizeof (to);
1086 GNUNET_assert (size >= psize);
1087 to.header.size = htons (psize);
1088 to.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN);
1089 to.tid = htonl (th->tunnel->tid);
1090 memset (&to.oid, 0, sizeof (struct GNUNET_PeerIdentity));
1091 memset (&to.sender, 0, sizeof (struct GNUNET_PeerIdentity));
1092 memcpy (cbuf, &to, sizeof (to));
1095 else if (th->target == 0)
1098 struct GNUNET_MESH_Multicast mc;
1099 struct GNUNET_MessageHeader *mh;
1101 GNUNET_assert (size >= th->size);
1102 mh = (struct GNUNET_MessageHeader *) &cbuf[sizeof (mc)];
1103 psize = th->notify (th->notify_cls, size - sizeof (mc), mh);
1104 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: multicast, type %u\n",
1108 psize += sizeof (mc);
1109 GNUNET_assert (size >= psize);
1110 mc.header.size = htons (psize);
1111 mc.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_MULTICAST);
1112 mc.tid = htonl (th->tunnel->tid);
1115 memset (&mc.oid, 0, sizeof (struct GNUNET_PeerIdentity));
1116 memcpy (cbuf, &mc, sizeof (mc));
1122 struct GNUNET_MESH_Unicast uc;
1123 struct GNUNET_MessageHeader *mh;
1125 GNUNET_assert (size >= th->size);
1126 mh = (struct GNUNET_MessageHeader *) &cbuf[sizeof (uc)];
1127 psize = th->notify (th->notify_cls, size - sizeof (uc), mh);
1128 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: unicast, type %u\n",
1132 psize += sizeof (uc);
1133 GNUNET_assert (size >= psize);
1134 uc.header.size = htons (psize);
1135 uc.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_UNICAST);
1136 uc.tid = htonl (th->tunnel->tid);
1137 memset (&uc.oid, 0, sizeof (struct GNUNET_PeerIdentity));
1138 GNUNET_PEER_resolve (th->target, &uc.destination);
1139 memcpy (cbuf, &uc, sizeof (uc));
1145 memcpy (cbuf, &th[1], th->size);
1148 if (th->timeout_task != GNUNET_SCHEDULER_NO_TASK)
1149 GNUNET_SCHEDULER_cancel (th->timeout_task);
1150 if (NULL != th->notify)
1152 th->tunnel->mesh->npackets--;
1153 th->tunnel->npackets--;
1155 GNUNET_CONTAINER_DLL_remove (h->th_head, h->th_tail, th);
1161 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: total size: %u\n", tsize);
1162 if (NULL != (th = h->th_head))
1164 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: next size: %u\n", th->size);
1167 GNUNET_CLIENT_notify_transmit_ready (h->client, th->size,
1168 GNUNET_TIME_UNIT_FOREVER_REL,
1169 GNUNET_YES, &send_callback, h);
1171 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: Send packet() END\n");
1172 if (GNUNET_NO == h->in_receive)
1174 h->in_receive = GNUNET_YES;
1175 GNUNET_CLIENT_receive (h->client, &msg_received, h,
1176 GNUNET_TIME_UNIT_FOREVER_REL);
1183 * Auxiliary function to send an already constructed packet to the service.
1184 * Takes care of creating a new queue element, copying the message and
1185 * calling the tmt_rdy function if necessary.
1187 * @param h mesh handle
1188 * @param msg message to transmit
1189 * @param tunnel tunnel this send is related to (NULL if N/A)
1192 send_packet (struct GNUNET_MESH_Handle *h,
1193 const struct GNUNET_MessageHeader *msg,
1194 struct GNUNET_MESH_Tunnel *tunnel)
1196 struct GNUNET_MESH_TransmitHandle *th;
1199 msize = ntohs (msg->size);
1200 th = GNUNET_malloc (sizeof (struct GNUNET_MESH_TransmitHandle) + msize);
1201 th->priority = UINT32_MAX;
1202 th->timeout = GNUNET_TIME_UNIT_FOREVER_ABS;
1204 th->tunnel = tunnel;
1205 memcpy (&th[1], msg, msize);
1206 add_to_queue (h, th);
1210 GNUNET_CLIENT_notify_transmit_ready (h->client, msize,
1211 GNUNET_TIME_UNIT_FOREVER_REL,
1212 GNUNET_YES, &send_callback, h);
1216 /******************************************************************************/
1217 /********************** API CALL DEFINITIONS *************************/
1218 /******************************************************************************/
1221 * Connect to the mesh service.
1223 * @param cfg configuration to use
1224 * @param queue_size size of the data message queue, shared among all tunnels
1225 * (each tunnel is guaranteed to accept at least one message,
1226 * no matter what is the status of other tunnels)
1227 * @param cls closure for the various callbacks that follow
1228 * (including handlers in the handlers array)
1229 * @param new_tunnel function called when an *inbound* tunnel is created
1230 * @param cleaner function called when an *inbound* tunnel is destroyed by the
1231 * remote peer, it is *not* called if GNUNET_MESH_tunnel_destroy
1232 * is called on the tunnel
1233 * @param handlers callbacks for messages we care about, NULL-terminated
1234 * note that the mesh is allowed to drop notifications about
1235 * inbound messages if the client does not process them fast
1236 * enough (for this notification type, a bounded queue is used)
1237 * @param stypes list of the applications that this client claims to provide
1238 * @return handle to the mesh service NULL on error
1239 * (in this case, init is never called)
1241 struct GNUNET_MESH_Handle *
1242 GNUNET_MESH_connect (const struct GNUNET_CONFIGURATION_Handle *cfg,
1243 unsigned int queue_size, void *cls,
1244 GNUNET_MESH_InboundTunnelNotificationHandler new_tunnel,
1245 GNUNET_MESH_TunnelEndHandler cleaner,
1246 const struct GNUNET_MESH_MessageHandler *handlers,
1247 const GNUNET_MESH_ApplicationType *stypes)
1249 struct GNUNET_MESH_Handle *h;
1251 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: GNUNET_MESH_connect()\n");
1252 h = GNUNET_malloc (sizeof (struct GNUNET_MESH_Handle));
1254 h->max_queue_size = queue_size;
1255 h->new_tunnel = new_tunnel;
1256 h->cleaner = cleaner;
1257 h->client = GNUNET_CLIENT_connect ("mesh", cfg);
1258 if (h->client == NULL)
1266 h->applications = stypes;
1267 h->message_handlers = handlers;
1268 h->next_tid = GNUNET_MESH_LOCAL_TUNNEL_ID_CLI;
1269 h->reconnect_time = GNUNET_TIME_UNIT_MILLISECONDS;
1271 /* count handlers and apps, calculate size */
1272 for (h->n_applications = 0; stypes[h->n_applications]; h->n_applications++) ;
1273 for (h->n_handlers = 0; handlers[h->n_handlers].type; h->n_handlers++) ;
1275 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: GNUNET_MESH_connect() END\n");
1281 * Disconnect from the mesh service. All tunnels will be destroyed. All tunnel
1282 * disconnect callbacks will be called on any still connected peers, notifying
1283 * about their disconnection. The registered inbound tunnel cleaner will be
1284 * called should any inbound tunnels still exist.
1286 * @param handle connection to mesh to disconnect
1289 GNUNET_MESH_disconnect (struct GNUNET_MESH_Handle *handle)
1291 struct GNUNET_MESH_Tunnel *t;
1292 struct GNUNET_MESH_Tunnel *aux;
1293 struct GNUNET_MESH_TransmitHandle *th;
1295 t = handle->tunnels_head;
1299 if (t->tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
1302 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: tunnel %X not destroyed\n", t->tid);
1304 destroy_tunnel (t, GNUNET_YES);
1307 while ( (th = handle->th_head) != NULL)
1309 struct GNUNET_MessageHeader *msg;
1311 /* Make sure it is an allowed packet (everything else should have been
1312 * already canceled).
1314 GNUNET_break (UINT32_MAX == th->priority);
1315 GNUNET_break (NULL == th->notify);
1316 msg = (struct GNUNET_MessageHeader *) &th[1];
1317 switch (ntohs(msg->type))
1319 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT:
1320 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY:
1324 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: unexpected msg %u\n",
1328 GNUNET_CONTAINER_DLL_remove (handle->th_head, handle->th_tail, th);
1332 if (NULL != handle->th)
1334 GNUNET_CLIENT_notify_transmit_ready_cancel (handle->th);
1337 if (NULL != handle->client)
1339 GNUNET_CLIENT_disconnect (handle->client, GNUNET_NO);
1340 handle->client = NULL;
1342 GNUNET_free (handle);
1347 * Create a new tunnel (we're initiator and will be allowed to add/remove peers
1348 * and to broadcast).
1350 * @param h mesh handle
1351 * @param tunnel_ctx client's tunnel context to associate with the tunnel
1352 * @param connect_handler function to call when peers are actually connected
1353 * @param disconnect_handler function to call when peers are disconnected
1354 * @param handler_cls closure for connect/disconnect handlers
1356 struct GNUNET_MESH_Tunnel *
1357 GNUNET_MESH_tunnel_create (struct GNUNET_MESH_Handle *h, void *tunnel_ctx,
1358 GNUNET_MESH_PeerConnectHandler connect_handler,
1359 GNUNET_MESH_PeerDisconnectHandler disconnect_handler,
1362 struct GNUNET_MESH_Tunnel *t;
1363 struct GNUNET_MESH_TunnelMessage msg;
1365 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: Creating new tunnel\n");
1366 t = create_tunnel (h, 0);
1367 t->connect_handler = connect_handler;
1368 t->disconnect_handler = disconnect_handler;
1369 t->cls = handler_cls;
1370 t->ctx = tunnel_ctx;
1371 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE);
1372 msg.header.size = htons (sizeof (struct GNUNET_MESH_TunnelMessage));
1373 msg.tunnel_id = htonl (t->tid);
1374 send_packet (h, &msg.header, t);
1380 * Destroy an existing tunnel. The existing callback for the tunnel will NOT
1383 * @param tunnel tunnel handle
1386 GNUNET_MESH_tunnel_destroy (struct GNUNET_MESH_Tunnel *tunnel)
1388 struct GNUNET_MESH_Handle *h;
1389 struct GNUNET_MESH_TunnelMessage msg;
1390 struct GNUNET_MESH_TransmitHandle *th;
1392 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: Destroying tunnel\n");
1395 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY);
1396 msg.header.size = htons (sizeof (struct GNUNET_MESH_TunnelMessage));
1397 msg.tunnel_id = htonl (tunnel->tid);
1401 struct GNUNET_MESH_TransmitHandle *aux;
1402 if (th->tunnel == tunnel)
1405 /* FIXME call the handler? */
1406 if (NULL != th->notify)
1407 th->notify (th->notify_cls, 0, NULL);
1408 GNUNET_CONTAINER_DLL_remove (h->th_head, h->th_tail, th);
1416 destroy_tunnel (tunnel, GNUNET_NO);
1417 send_packet (h, &msg.header, tunnel);
1422 * Request that a peer should be added to the tunnel. The existing
1423 * connect handler will be called ONCE with either success or failure.
1424 * This function should NOT be called again with the same peer before the
1425 * connect handler is called.
1427 * @param tunnel handle to existing tunnel
1428 * @param peer peer to add
1431 GNUNET_MESH_peer_request_connect_add (struct GNUNET_MESH_Tunnel *tunnel,
1432 const struct GNUNET_PeerIdentity *peer)
1434 struct GNUNET_MESH_PeerControl msg;
1435 GNUNET_PEER_Id peer_id;
1438 peer_id = GNUNET_PEER_intern (peer);
1439 for (i = 0; i < tunnel->npeers; i++)
1441 if (tunnel->peers[i]->id == peer_id)
1443 /* Peer already exists in tunnel */
1444 GNUNET_PEER_change_rc (peer_id, -1);
1449 if (NULL == add_peer_to_tunnel (tunnel, peer))
1452 msg.header.size = htons (sizeof (struct GNUNET_MESH_PeerControl));
1453 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD);
1454 msg.tunnel_id = htonl (tunnel->tid);
1456 send_packet (tunnel->mesh, &msg.header, tunnel);
1463 * Request that a peer should be removed from the tunnel. The existing
1464 * disconnect handler will be called ONCE if we were connected.
1466 * @param tunnel handle to existing tunnel
1467 * @param peer peer to remove
1470 GNUNET_MESH_peer_request_connect_del (struct GNUNET_MESH_Tunnel *tunnel,
1471 const struct GNUNET_PeerIdentity *peer)
1473 struct GNUNET_MESH_PeerControl msg;
1474 GNUNET_PEER_Id peer_id;
1477 peer_id = GNUNET_PEER_search (peer);
1483 for (i = 0; i < tunnel->npeers; i++)
1484 if (tunnel->peers[i]->id == peer_id)
1486 if (i == tunnel->npeers)
1491 if (NULL != tunnel->disconnect_handler && tunnel->peers[i]->connected == 1)
1492 tunnel->disconnect_handler (tunnel->cls, peer);
1493 GNUNET_PEER_change_rc (peer_id, -1);
1494 GNUNET_free (tunnel->peers[i]);
1495 tunnel->peers[i] = tunnel->peers[tunnel->npeers - 1];
1496 GNUNET_array_grow (tunnel->peers, tunnel->npeers, tunnel->npeers - 1);
1498 msg.header.size = htons (sizeof (struct GNUNET_MESH_PeerControl));
1499 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_DEL);
1500 msg.tunnel_id = htonl (tunnel->tid);
1501 memcpy (&msg.peer, peer, sizeof (struct GNUNET_PeerIdentity));
1502 send_packet (tunnel->mesh, &msg.header, tunnel);
1507 * Request that the mesh should try to connect to a peer supporting the given
1510 * @param tunnel handle to existing tunnel
1511 * @param app_type application type that must be supported by the peer (MESH
1512 * should discover peer in proximity handling this type)
1515 GNUNET_MESH_peer_request_connect_by_type (struct GNUNET_MESH_Tunnel *tunnel,
1516 GNUNET_MESH_ApplicationType app_type)
1518 struct GNUNET_MESH_ConnectPeerByType msg;
1520 GNUNET_array_append (tunnel->apps, tunnel->napps, app_type);
1522 msg.header.size = htons (sizeof (struct GNUNET_MESH_ConnectPeerByType));
1523 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD_BY_TYPE);
1524 msg.tunnel_id = htonl (tunnel->tid);
1525 msg.type = htonl (app_type);
1526 send_packet (tunnel->mesh, &msg.header, tunnel);
1531 * Ask the mesh to call "notify" once it is ready to transmit the
1532 * given number of bytes to the specified "target". If we are not yet
1533 * connected to the specified peer, a call to this function will cause
1534 * us to try to establish a connection.
1536 * @param tunnel tunnel to use for transmission
1537 * @param cork is corking allowed for this transmission?
1538 * @param priority how important is the message?
1539 * @param maxdelay how long can the message wait?
1540 * @param target destination for the message,
1541 * NULL for multicast to all tunnel targets
1542 * @param notify_size how many bytes of buffer space does notify want?
1543 * @param notify function to call when buffer space is available;
1544 * will be called with NULL on timeout or if the overall queue
1545 * for this peer is larger than queue_size and this is currently
1546 * the message with the lowest priority
1547 * @param notify_cls closure for notify
1548 * @return non-NULL if the notify callback was queued,
1549 * NULL if we can not even queue the request (insufficient
1550 * memory); if NULL is returned, "notify" will NOT be called.
1552 struct GNUNET_MESH_TransmitHandle *
1553 GNUNET_MESH_notify_transmit_ready (struct GNUNET_MESH_Tunnel *tunnel, int cork,
1555 struct GNUNET_TIME_Relative maxdelay,
1556 const struct GNUNET_PeerIdentity *target,
1558 GNUNET_CONNECTION_TransmitReadyNotify notify,
1561 struct GNUNET_MESH_TransmitHandle *th;
1562 struct GNUNET_MESH_TransmitHandle *least_priority_th;
1563 uint32_t least_priority;
1566 GNUNET_assert (NULL != tunnel);
1567 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: mesh notify transmit ready called\n");
1569 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: target %s\n", GNUNET_i2s (target));
1571 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: target multicast\n");
1572 GNUNET_assert (NULL != notify);
1573 if (tunnel->mesh->npackets >= tunnel->mesh->max_queue_size &&
1574 tunnel->npackets > 0)
1579 th = tunnel->mesh->th_tail;
1580 least_priority = priority;
1581 least_priority_th = NULL;
1584 if (th->priority < least_priority && th->tunnel->npackets > 1)
1586 least_priority_th = th;
1587 least_priority = th->priority;
1591 if (NULL == least_priority_th)
1593 /* Can't be a control message */
1594 GNUNET_assert (NULL != least_priority_th->notify);
1595 least_priority_th->notify (notify_cls, 0, NULL);
1596 least_priority_th->tunnel->npackets--;
1597 tunnel->mesh->npackets--;
1598 GNUNET_CONTAINER_DLL_remove (tunnel->mesh->th_head, tunnel->mesh->th_tail,
1600 if (GNUNET_SCHEDULER_NO_TASK != least_priority_th->timeout_task)
1601 GNUNET_SCHEDULER_cancel (least_priority_th->timeout_task);
1602 GNUNET_free (least_priority_th);
1605 tunnel->mesh->npackets++;
1606 th = GNUNET_malloc (sizeof (struct GNUNET_MESH_TransmitHandle));
1607 th->tunnel = tunnel;
1608 th->priority = priority;
1609 th->timeout = GNUNET_TIME_relative_to_absolute (maxdelay);
1610 th->target = GNUNET_PEER_intern (target);
1611 if (tunnel->tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
1612 overhead = sizeof (struct GNUNET_MESH_ToOrigin);
1613 else if (NULL == target)
1614 overhead = sizeof (struct GNUNET_MESH_Multicast);
1616 overhead = sizeof (struct GNUNET_MESH_Unicast);
1617 th->size = notify_size + overhead;
1618 th->notify = notify;
1619 th->notify_cls = notify_cls;
1620 add_to_queue (tunnel->mesh, th);
1621 if (NULL != tunnel->mesh->th)
1624 GNUNET_CLIENT_notify_transmit_ready (tunnel->mesh->client, th->size,
1625 GNUNET_TIME_UNIT_FOREVER_REL,
1626 GNUNET_YES, &send_callback,
1633 * Cancel the specified transmission-ready notification.
1635 * @param th handle that was returned by "notify_transmit_ready".
1638 GNUNET_MESH_notify_transmit_ready_cancel (struct GNUNET_MESH_TransmitHandle *th)
1640 struct GNUNET_MESH_Handle *mesh;
1642 mesh = th->tunnel->mesh;
1643 if (th->timeout_task != GNUNET_SCHEDULER_NO_TASK)
1644 GNUNET_SCHEDULER_cancel (th->timeout_task);
1645 GNUNET_CONTAINER_DLL_remove (mesh->th_head, mesh->th_tail, th);
1647 if ((NULL == mesh->th_head) && (NULL != mesh->th))
1649 /* queue empty, no point in asking for transmission */
1650 GNUNET_CLIENT_notify_transmit_ready_cancel (mesh->th);
1657 * Transition API for tunnel ctx management
1660 GNUNET_MESH_tunnel_set_data (struct GNUNET_MESH_Tunnel *tunnel, void *data)
1666 * Transition API for tunnel ctx management
1669 GNUNET_MESH_tunnel_get_data (struct GNUNET_MESH_Tunnel *tunnel)
1675 #if 0 /* keep Emacsens' auto-indent happy */