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 *aux;
398 GNUNET_CONTAINER_DLL_remove (h->th_head, h->th_tail, th);
399 if (NULL == h->th_head && NULL != h->th)
401 GNUNET_CLIENT_notify_transmit_ready_cancel (h->th);
404 if (NULL != th->notify)
405 th->notify (th->notify_cls, 0, NULL);
406 if (GNUNET_SCHEDULER_NO_TASK != th->timeout_task)
407 GNUNET_SCHEDULER_cancel (th->timeout_task);
416 if (NULL == h->th_head && NULL != h->th)
418 GNUNET_CLIENT_notify_transmit_ready_cancel(h->th);
421 GNUNET_CONTAINER_DLL_remove (h->tunnels_head, h->tunnels_tail, t);
422 for (i = 0; i < t->npeers; i++)
424 if (NULL != t->disconnect_handler && t->peers[i]->connected)
426 GNUNET_PEER_resolve (t->peers[i]->id, &pi);
427 t->disconnect_handler (t->cls, &pi);
429 GNUNET_PEER_change_rc (t->peers[i]->id, -1);
430 GNUNET_free (t->peers[i]);
433 GNUNET_free (t->peers);
434 if (NULL != h->cleaner && 0 != t->owner && GNUNET_YES == call_cleaner)
435 h->cleaner (h->cls, t, t->ctx);
437 GNUNET_PEER_change_rc (t->owner, -1);
438 if (0 != t->napps && t->apps)
439 GNUNET_free (t->apps);
446 * Get the peer descriptor for the peer with id from the given tunnel
447 * @param t Tunnel handle
448 * @param id Short form ID of the wanted peer
449 * @return handle to the requested peer or NULL if not found
451 static struct GNUNET_MESH_Peer *
452 retrieve_peer (struct GNUNET_MESH_Tunnel *t, GNUNET_PEER_Id id)
456 for (i = 0; i < t->npeers; i++)
457 if (t->peers[i]->id == id)
464 * Add a peer into a tunnel
465 * @param t Tunnel handle
466 * @param pi Full ID of the new peer
467 * @return handle to the newly created peer
469 static struct GNUNET_MESH_Peer *
470 add_peer_to_tunnel (struct GNUNET_MESH_Tunnel *t,
471 const struct GNUNET_PeerIdentity *pi)
473 struct GNUNET_MESH_Peer *p;
481 id = GNUNET_PEER_intern (pi);
483 p = GNUNET_malloc (sizeof (struct GNUNET_MESH_Peer));
486 GNUNET_array_append (t->peers, t->npeers, p);
492 * Remove a peer from a tunnel
493 * @param p Peer handle
496 remove_peer_from_tunnel (struct GNUNET_MESH_Peer *p)
500 for (i = 0; i < p->t->npeers; i++)
502 if (p->t->peers[i] == p)
505 if (i == p->t->npeers)
510 p->t->peers[i] = p->t->peers[p->t->npeers - 1];
511 GNUNET_array_grow (p->t->peers, p->t->npeers, p->t->npeers - 1);
516 * Notify client that the transmission has timed out
518 * @param tc task context
521 timeout_transmission (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
523 struct GNUNET_MESH_TransmitHandle *th = cls;
524 struct GNUNET_MESH_Handle *mesh;
526 mesh = th->tunnel->mesh;
527 GNUNET_CONTAINER_DLL_remove (mesh->th_head, mesh->th_tail, th);
528 if (th->notify != NULL)
529 th->notify (th->notify_cls, 0, NULL);
531 if ((NULL == mesh->th_head) && (NULL != mesh->th))
533 /* queue empty, no point in asking for transmission */
534 GNUNET_CLIENT_notify_transmit_ready_cancel (mesh->th);
541 * Add a transmit handle to the transmission queue by priority and set the
544 * @param h mesh handle with the queue head and tail
545 * @param th handle to the packet to be transmitted
548 add_to_queue (struct GNUNET_MESH_Handle *h,
549 struct GNUNET_MESH_TransmitHandle *th)
551 struct GNUNET_MESH_TransmitHandle *p;
554 while ((NULL != p) && (th->priority <= p->priority))
560 GNUNET_CONTAINER_DLL_insert_after (h->th_head, h->th_tail, p, th);
561 if (GNUNET_TIME_UNIT_FOREVER_ABS.abs_value == th->timeout.abs_value)
564 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_absolute_get_remaining
565 (th->timeout), &timeout_transmission, th);
570 * Auxiliary function to send an already constructed packet to the service.
571 * Takes care of creating a new queue element, copying the message and
572 * calling the tmt_rdy function if necessary.
574 * @param h mesh handle
575 * @param msg message to transmit
576 * @param tunnel tunnel this send is related to (NULL if N/A)
579 send_packet (struct GNUNET_MESH_Handle *h,
580 const struct GNUNET_MessageHeader *msg,
581 struct GNUNET_MESH_Tunnel *tunnel);
585 * Reconnect callback: tries to reconnect again after a failer previous
587 * @param cls closure (mesh handle)
588 * @param tc task context
591 reconnect_cbk (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
595 * Send a connect packet to the service with the applications and types
596 * requested by the user.
598 * @param h The mesh handle.
602 send_connect (struct GNUNET_MESH_Handle *h)
606 size = sizeof (struct GNUNET_MESH_ClientConnect);
607 size += h->n_applications * sizeof (GNUNET_MESH_ApplicationType);
608 size += h->n_handlers * sizeof (uint16_t);
611 struct GNUNET_MESH_ClientConnect *msg;
612 GNUNET_MESH_ApplicationType *apps;
617 /* build connection packet */
618 msg = (struct GNUNET_MESH_ClientConnect *) buf;
619 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT);
620 msg->header.size = htons (size);
621 apps = (GNUNET_MESH_ApplicationType *) &msg[1];
622 for (napps = 0; napps < h->n_applications; napps++)
624 apps[napps] = htonl (h->applications[napps]);
625 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: app %u\n", h->applications[napps]);
627 types = (uint16_t *) & apps[napps];
628 for (ntypes = 0; ntypes < h->n_handlers; ntypes++)
629 types[ntypes] = htons (h->message_handlers[ntypes].type);
630 msg->applications = htons (napps);
631 msg->types = htons (ntypes);
633 LOG (GNUNET_ERROR_TYPE_DEBUG,
634 "mesh: Sending %lu bytes long message %d types and %d apps\n",
635 ntohs (msg->header.size), ntypes, napps);
637 send_packet (h, &msg->header, NULL);
643 * Reconnect to the service, retransmit all infomation to try to restore the
646 * @param h handle to the mesh
648 * @return GNUNET_YES in case of sucess, GNUNET_NO otherwise (service down...)
651 reconnect (struct GNUNET_MESH_Handle *h)
653 struct GNUNET_MESH_Tunnel *t;
657 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: *****************************\n");
658 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: ******* RECONNECT *******\n");
659 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: *****************************\n");
661 h->in_receive = GNUNET_NO;
665 GNUNET_CLIENT_notify_transmit_ready_cancel (h->th);
668 if (NULL != h->client)
670 GNUNET_CLIENT_disconnect (h->client, GNUNET_NO);
674 h->client = GNUNET_CLIENT_connect ("mesh", h->cfg);
675 if (h->client == NULL)
677 GNUNET_SCHEDULER_add_delayed (h->reconnect_time, &reconnect_cbk, h);
679 GNUNET_TIME_relative_min (GNUNET_TIME_UNIT_SECONDS,
680 GNUNET_TIME_relative_multiply
681 (h->reconnect_time, 2));
682 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: Next retry in %sms\n",
683 GNUNET_TIME_relative_to_string (h->reconnect_time));
689 h->reconnect_time = GNUNET_TIME_UNIT_MILLISECONDS;
692 /* Rebuild all tunnels */
693 for (t = h->tunnels_head; NULL != t; t = t->next)
695 struct GNUNET_MESH_TunnelMessage tmsg;
696 struct GNUNET_MESH_PeerControl pmsg;
698 if (t->tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
700 /* Tunnel was created by service (incoming tunnel) */
701 /* TODO: Notify service of missing tunnel, to request
702 * creator to recreate path (find a path to him via DHT?)
706 tmsg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE);
707 tmsg.header.size = htons (sizeof (struct GNUNET_MESH_TunnelMessage));
708 tmsg.tunnel_id = htonl (t->tid);
709 send_packet (h, &tmsg.header, t);
711 pmsg.header.size = htons (sizeof (struct GNUNET_MESH_PeerControl));
712 pmsg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD);
713 pmsg.tunnel_id = htonl (t->tid);
715 /* Reconnect all peers */
716 for (i = 0; i < t->npeers; i++)
718 GNUNET_PEER_resolve (t->peers[i]->id, &pmsg.peer);
719 if (NULL != t->disconnect_handler && t->peers[i]->connected)
720 t->disconnect_handler (t->cls, &pmsg.peer);
721 /* If the tunnel was "by type", dont connect individual peers */
723 send_packet (t->mesh, &pmsg.header, t);
725 /* Reconnect all types, if any */
726 for (i = 0; i < t->napps; i++)
728 struct GNUNET_MESH_ConnectPeerByType msg;
730 msg.header.size = htons (sizeof (struct GNUNET_MESH_ConnectPeerByType));
731 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD_BY_TYPE);
732 msg.tunnel_id = htonl (t->tid);
733 msg.type = htonl (t->apps[i]);
734 send_packet (t->mesh, &msg.header, t);
741 * Reconnect callback: tries to reconnect again after a failer previous
743 * @param cls closure (mesh handle)
744 * @param tc task context
747 reconnect_cbk (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
749 struct GNUNET_MESH_Handle *h = cls;
751 if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN)
757 /******************************************************************************/
758 /*********************** RECEIVE HANDLERS ****************************/
759 /******************************************************************************/
762 * Process the new tunnel notification and add it to the tunnels in the handle
764 * @param h The mesh handle
765 * @param msg A message with the details of the new incoming tunnel
768 process_tunnel_created (struct GNUNET_MESH_Handle *h,
769 const struct GNUNET_MESH_TunnelNotification *msg)
771 struct GNUNET_MESH_Tunnel *t;
772 MESH_TunnelNumber tid;
774 tid = ntohl (msg->tunnel_id);
775 if (tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
780 t = create_tunnel (h, tid);
781 t->owner = GNUNET_PEER_intern (&msg->peer);
783 t->peers = GNUNET_malloc (sizeof (struct GNUNET_MESH_Peer *));
784 t->peers[0] = GNUNET_malloc (sizeof (struct GNUNET_MESH_Peer));
786 t->peers[0]->connected = 1;
787 t->peers[0]->id = t->owner;
788 GNUNET_PEER_change_rc (t->owner, 1);
791 if (NULL != h->new_tunnel)
793 struct GNUNET_ATS_Information atsi;
797 t->ctx = h->new_tunnel (h->cls, t, &msg->peer, &atsi);
800 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: new incoming tunnel %X\n",
808 * Process the tunnel destroy notification and free associated resources
810 * @param h The mesh handle
811 * @param msg A message with the details of the tunnel being destroyed
814 process_tunnel_destroy (struct GNUNET_MESH_Handle *h,
815 const struct GNUNET_MESH_TunnelMessage *msg)
817 struct GNUNET_MESH_Tunnel *t;
818 MESH_TunnelNumber tid;
820 tid = ntohl (msg->tunnel_id);
821 t = retrieve_tunnel (h, tid);
832 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: tunnel %u destroyed\n", t->tid);
834 destroy_tunnel (t, GNUNET_YES);
840 * Process the new peer event and notify the upper level of it
842 * @param h The mesh handle
843 * @param msg A message with the details of the peer event
846 process_peer_event (struct GNUNET_MESH_Handle *h,
847 const struct GNUNET_MESH_PeerControl *msg)
849 struct GNUNET_MESH_Tunnel *t;
850 struct GNUNET_MESH_Peer *p;
851 struct GNUNET_ATS_Information atsi;
855 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: processig peer event\n");
856 size = ntohs (msg->header.size);
857 if (size != sizeof (struct GNUNET_MESH_PeerControl))
862 t = retrieve_tunnel (h, ntohl (msg->tunnel_id));
868 id = GNUNET_PEER_search (&msg->peer);
869 if ((p = retrieve_peer (t, id)) == NULL)
870 p = add_peer_to_tunnel (t, &msg->peer);
871 if (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD == ntohs (msg->header.type))
873 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: adding peer\n");
874 if (NULL != t->connect_handler)
878 t->connect_handler (t->cls, &msg->peer, &atsi);
884 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: removing peer\n");
885 if (NULL != t->disconnect_handler && p->connected)
887 t->disconnect_handler (t->cls, &msg->peer);
889 remove_peer_from_tunnel (p);
892 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: processing peer event END\n");
897 * Process the incoming data packets
899 * @param h The mesh handle
900 * @param message A message encapsulating the data
903 process_incoming_data (struct GNUNET_MESH_Handle *h,
904 const struct GNUNET_MessageHeader *message)
906 const struct GNUNET_MessageHeader *payload;
907 const struct GNUNET_MESH_MessageHandler *handler;
908 const struct GNUNET_PeerIdentity *peer;
909 struct GNUNET_MESH_Unicast *ucast;
910 struct GNUNET_MESH_Multicast *mcast;
911 struct GNUNET_MESH_ToOrigin *to_orig;
912 struct GNUNET_MESH_Tunnel *t;
916 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: Got a data message!\n");
917 type = ntohs (message->type);
920 case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
921 ucast = (struct GNUNET_MESH_Unicast *) message;
923 t = retrieve_tunnel (h, ntohl (ucast->tid));
924 payload = (struct GNUNET_MessageHeader *) &ucast[1];
926 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: ucast on tunnel %s [%x]\n",
927 GNUNET_i2s (peer), ntohl (ucast->tid));
929 case GNUNET_MESSAGE_TYPE_MESH_MULTICAST:
930 mcast = (struct GNUNET_MESH_Multicast *) message;
931 t = retrieve_tunnel (h, ntohl (mcast->tid));
932 payload = (struct GNUNET_MessageHeader *) &mcast[1];
934 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: mcast on tunnel %s [%x]\n",
935 GNUNET_i2s (peer), ntohl (mcast->tid));
937 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
938 to_orig = (struct GNUNET_MESH_ToOrigin *) message;
939 t = retrieve_tunnel (h, ntohl (to_orig->tid));
940 payload = (struct GNUNET_MessageHeader *) &to_orig[1];
941 peer = &to_orig->sender;
942 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: torig on tunnel %s [%x]\n",
943 GNUNET_i2s (peer), ntohl (to_orig->tid));
954 type = ntohs (payload->type);
955 for (i = 0; i < h->n_handlers; i++)
957 handler = &h->message_handlers[i];
958 if (handler->type == type)
960 struct GNUNET_ATS_Information atsi;
965 handler->callback (h->cls, t, &t->ctx, peer, payload, &atsi))
967 LOG (GNUNET_ERROR_TYPE_DEBUG, "MESH: callback caused disconnection\n");
968 GNUNET_MESH_disconnect (h);
974 LOG (GNUNET_ERROR_TYPE_DEBUG,
975 "MESH: callback completed successfully\n");
985 * Function to process all messages received from the service
988 * @param msg message received, NULL on timeout or fatal error
991 msg_received (void *cls, const struct GNUNET_MessageHeader *msg)
993 struct GNUNET_MESH_Handle *h = cls;
1000 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: received a message type %hu from MESH\n",
1002 switch (ntohs (msg->type))
1004 /* Notify of a new incoming tunnel */
1005 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE:
1006 process_tunnel_created (h, (struct GNUNET_MESH_TunnelNotification *) msg);
1008 /* Notify of a tunnel disconnection */
1009 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY:
1010 process_tunnel_destroy (h, (struct GNUNET_MESH_TunnelMessage *) msg);
1012 /* Notify of a new peer or a peer disconnect in the tunnel */
1013 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD:
1014 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_DEL:
1015 process_peer_event (h, (struct GNUNET_MESH_PeerControl *) msg);
1017 /* Notify of a new data packet in the tunnel */
1018 case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
1019 case GNUNET_MESSAGE_TYPE_MESH_MULTICAST:
1020 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
1021 process_incoming_data (h, msg);
1023 /* We shouldn't get any other packages, log and ignore */
1025 LOG (GNUNET_ERROR_TYPE_WARNING,
1026 "MESH: unsolicited message form service (type %d)\n",
1029 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: message processed\n");
1030 GNUNET_CLIENT_receive (h->client, &msg_received, h,
1031 GNUNET_TIME_UNIT_FOREVER_REL);
1035 /******************************************************************************/
1036 /************************ SEND FUNCTIONS ****************************/
1037 /******************************************************************************/
1040 * Function called to send a message to the service.
1041 * "buf" will be NULL and "size" zero if the socket was closed for writing in
1044 * @param cls closure, the mesh handle
1045 * @param size number of bytes available in buf
1046 * @param buf where the callee should write the connect message
1047 * @return number of bytes written to buf
1050 send_callback (void *cls, size_t size, void *buf)
1052 struct GNUNET_MESH_Handle *h = cls;
1053 struct GNUNET_MESH_TransmitHandle *th;
1058 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: Send packet() Buffer %u\n", size);
1060 if ((0 == size) || (NULL == buf))
1066 while ((NULL != (th = h->th_head)) && (size >= th->size))
1068 if (NULL != th->notify)
1070 if (th->tunnel->tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
1072 /* traffic to origin */
1073 struct GNUNET_MESH_ToOrigin to;
1074 struct GNUNET_MessageHeader *mh;
1076 GNUNET_assert (size >= th->size);
1077 mh = (struct GNUNET_MessageHeader *) &cbuf[sizeof (to)];
1078 psize = th->notify (th->notify_cls, size - sizeof (to), mh);
1079 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: to origin, type %u\n",
1083 psize += sizeof (to);
1084 GNUNET_assert (size >= psize);
1085 to.header.size = htons (psize);
1086 to.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN);
1087 to.tid = htonl (th->tunnel->tid);
1088 memset (&to.oid, 0, sizeof (struct GNUNET_PeerIdentity));
1089 memset (&to.sender, 0, sizeof (struct GNUNET_PeerIdentity));
1090 memcpy (cbuf, &to, sizeof (to));
1093 else if (th->target == 0)
1096 struct GNUNET_MESH_Multicast mc;
1097 struct GNUNET_MessageHeader *mh;
1099 GNUNET_assert (size >= th->size);
1100 mh = (struct GNUNET_MessageHeader *) &cbuf[sizeof (mc)];
1101 psize = th->notify (th->notify_cls, size - sizeof (mc), mh);
1102 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: multicast, type %u\n",
1106 psize += sizeof (mc);
1107 GNUNET_assert (size >= psize);
1108 mc.header.size = htons (psize);
1109 mc.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_MULTICAST);
1110 mc.tid = htonl (th->tunnel->tid);
1113 memset (&mc.oid, 0, sizeof (struct GNUNET_PeerIdentity));
1114 memcpy (cbuf, &mc, sizeof (mc));
1120 struct GNUNET_MESH_Unicast uc;
1121 struct GNUNET_MessageHeader *mh;
1123 GNUNET_assert (size >= th->size);
1124 mh = (struct GNUNET_MessageHeader *) &cbuf[sizeof (uc)];
1125 psize = th->notify (th->notify_cls, size - sizeof (uc), mh);
1126 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: unicast, type %u\n",
1130 psize += sizeof (uc);
1131 GNUNET_assert (size >= psize);
1132 uc.header.size = htons (psize);
1133 uc.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_UNICAST);
1134 uc.tid = htonl (th->tunnel->tid);
1135 memset (&uc.oid, 0, sizeof (struct GNUNET_PeerIdentity));
1136 GNUNET_PEER_resolve (th->target, &uc.destination);
1137 memcpy (cbuf, &uc, sizeof (uc));
1143 memcpy (cbuf, &th[1], th->size);
1146 if (th->timeout_task != GNUNET_SCHEDULER_NO_TASK)
1147 GNUNET_SCHEDULER_cancel (th->timeout_task);
1148 if (NULL != th->notify)
1150 th->tunnel->mesh->npackets--;
1151 th->tunnel->npackets--;
1153 GNUNET_CONTAINER_DLL_remove (h->th_head, h->th_tail, th);
1159 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: total size: %u\n", tsize);
1160 if (NULL != (th = h->th_head))
1162 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: next size: %u\n", th->size);
1164 GNUNET_CLIENT_notify_transmit_ready (h->client, th->size,
1165 GNUNET_TIME_UNIT_FOREVER_REL,
1166 GNUNET_YES, &send_callback, h);
1168 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: Send packet() END\n");
1169 if (GNUNET_NO == h->in_receive)
1171 h->in_receive = GNUNET_YES;
1172 GNUNET_CLIENT_receive (h->client, &msg_received, h,
1173 GNUNET_TIME_UNIT_FOREVER_REL);
1180 * Auxiliary function to send an already constructed packet to the service.
1181 * Takes care of creating a new queue element, copying the message and
1182 * calling the tmt_rdy function if necessary.
1184 * @param h mesh handle
1185 * @param msg message to transmit
1186 * @param tunnel tunnel this send is related to (NULL if N/A)
1189 send_packet (struct GNUNET_MESH_Handle *h,
1190 const struct GNUNET_MessageHeader *msg,
1191 struct GNUNET_MESH_Tunnel *tunnel)
1193 struct GNUNET_MESH_TransmitHandle *th;
1196 msize = ntohs (msg->size);
1197 th = GNUNET_malloc (sizeof (struct GNUNET_MESH_TransmitHandle) + msize);
1198 th->priority = UINT32_MAX;
1199 th->timeout = GNUNET_TIME_UNIT_FOREVER_ABS;
1201 th->tunnel = tunnel;
1202 memcpy (&th[1], msg, msize);
1203 add_to_queue (h, th);
1207 GNUNET_CLIENT_notify_transmit_ready (h->client, msize,
1208 GNUNET_TIME_UNIT_FOREVER_REL,
1209 GNUNET_YES, &send_callback, h);
1213 /******************************************************************************/
1214 /********************** API CALL DEFINITIONS *************************/
1215 /******************************************************************************/
1218 * Connect to the mesh service.
1220 * @param cfg configuration to use
1221 * @param queue_size size of the data message queue, shared among all tunnels
1222 * (each tunnel is guaranteed to accept at least one message,
1223 * no matter what is the status of other tunnels)
1224 * @param cls closure for the various callbacks that follow
1225 * (including handlers in the handlers array)
1226 * @param new_tunnel function called when an *inbound* tunnel is created
1227 * @param cleaner function called when an *inbound* tunnel is destroyed by the
1228 * remote peer, it is *not* called if GNUNET_MESH_tunnel_destroy
1229 * is called on the tunnel
1230 * @param handlers callbacks for messages we care about, NULL-terminated
1231 * note that the mesh is allowed to drop notifications about
1232 * inbound messages if the client does not process them fast
1233 * enough (for this notification type, a bounded queue is used)
1234 * @param stypes list of the applications that this client claims to provide
1235 * @return handle to the mesh service NULL on error
1236 * (in this case, init is never called)
1238 struct GNUNET_MESH_Handle *
1239 GNUNET_MESH_connect (const struct GNUNET_CONFIGURATION_Handle *cfg,
1240 unsigned int queue_size, void *cls,
1241 GNUNET_MESH_InboundTunnelNotificationHandler new_tunnel,
1242 GNUNET_MESH_TunnelEndHandler cleaner,
1243 const struct GNUNET_MESH_MessageHandler *handlers,
1244 const GNUNET_MESH_ApplicationType *stypes)
1246 struct GNUNET_MESH_Handle *h;
1248 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: GNUNET_MESH_connect()\n");
1249 h = GNUNET_malloc (sizeof (struct GNUNET_MESH_Handle));
1251 h->max_queue_size = queue_size;
1252 h->new_tunnel = new_tunnel;
1253 h->cleaner = cleaner;
1254 h->client = GNUNET_CLIENT_connect ("mesh", cfg);
1255 if (h->client == NULL)
1263 h->applications = stypes;
1264 h->message_handlers = handlers;
1265 h->next_tid = GNUNET_MESH_LOCAL_TUNNEL_ID_CLI;
1266 h->reconnect_time = GNUNET_TIME_UNIT_MILLISECONDS;
1268 /* count handlers and apps, calculate size */
1269 for (h->n_applications = 0; stypes[h->n_applications]; h->n_applications++) ;
1270 for (h->n_handlers = 0; handlers[h->n_handlers].type; h->n_handlers++) ;
1272 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: GNUNET_MESH_connect() END\n");
1278 * Disconnect from the mesh service. All tunnels will be destroyed. All tunnel
1279 * disconnect callbacks will be called on any still connected peers, notifying
1280 * about their disconnection. The registered inbound tunnel cleaner will be
1281 * called should any inbound tunnels still exist.
1283 * @param handle connection to mesh to disconnect
1286 GNUNET_MESH_disconnect (struct GNUNET_MESH_Handle *handle)
1288 struct GNUNET_MESH_Tunnel *t;
1289 struct GNUNET_MESH_Tunnel *aux;
1290 struct GNUNET_MESH_TransmitHandle *th;
1292 t = handle->tunnels_head;
1296 if (t->tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
1300 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: tunnel %X not destroyed\n",
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:
1325 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: unexpected msg %u\n",
1330 GNUNET_CONTAINER_DLL_remove (handle->th_head, handle->th_tail, th);
1334 if (NULL != handle->th)
1336 GNUNET_CLIENT_notify_transmit_ready_cancel (handle->th);
1339 if (NULL != handle->client)
1341 GNUNET_CLIENT_disconnect (handle->client, GNUNET_NO);
1342 handle->client = NULL;
1344 GNUNET_free (handle);
1349 * Create a new tunnel (we're initiator and will be allowed to add/remove peers
1350 * and to broadcast).
1352 * @param h mesh handle
1353 * @param tunnel_ctx client's tunnel context to associate with the tunnel
1354 * @param connect_handler function to call when peers are actually connected
1355 * @param disconnect_handler function to call when peers are disconnected
1356 * @param handler_cls closure for connect/disconnect handlers
1358 struct GNUNET_MESH_Tunnel *
1359 GNUNET_MESH_tunnel_create (struct GNUNET_MESH_Handle *h, void *tunnel_ctx,
1360 GNUNET_MESH_PeerConnectHandler connect_handler,
1361 GNUNET_MESH_PeerDisconnectHandler disconnect_handler,
1364 struct GNUNET_MESH_Tunnel *t;
1365 struct GNUNET_MESH_TunnelMessage msg;
1367 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: Creating new tunnel\n");
1368 t = create_tunnel (h, 0);
1369 t->connect_handler = connect_handler;
1370 t->disconnect_handler = disconnect_handler;
1371 t->cls = handler_cls;
1372 t->ctx = tunnel_ctx;
1373 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE);
1374 msg.header.size = htons (sizeof (struct GNUNET_MESH_TunnelMessage));
1375 msg.tunnel_id = htonl (t->tid);
1376 send_packet (h, &msg.header, t);
1382 * Destroy an existing tunnel. The existing callback for the tunnel will NOT
1385 * @param tunnel tunnel handle
1388 GNUNET_MESH_tunnel_destroy (struct GNUNET_MESH_Tunnel *tunnel)
1390 struct GNUNET_MESH_Handle *h;
1391 struct GNUNET_MESH_TunnelMessage msg;
1392 struct GNUNET_MESH_TransmitHandle *th;
1394 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: Destroying tunnel\n");
1397 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY);
1398 msg.header.size = htons (sizeof (struct GNUNET_MESH_TunnelMessage));
1399 msg.tunnel_id = htonl (tunnel->tid);
1403 struct GNUNET_MESH_TransmitHandle *aux;
1404 if (th->tunnel == tunnel)
1407 /* FIXME call the handler? */
1408 if (NULL != th->notify)
1409 th->notify (th->notify_cls, 0, NULL);
1410 GNUNET_CONTAINER_DLL_remove (h->th_head, h->th_tail, th);
1418 destroy_tunnel (tunnel, GNUNET_NO);
1419 send_packet (h, &msg.header, tunnel);
1424 * Request that a peer should be added to the tunnel. The existing
1425 * connect handler will be called ONCE with either success or failure.
1426 * This function should NOT be called again with the same peer before the
1427 * connect handler is called.
1429 * @param tunnel handle to existing tunnel
1430 * @param peer peer to add
1433 GNUNET_MESH_peer_request_connect_add (struct GNUNET_MESH_Tunnel *tunnel,
1434 const struct GNUNET_PeerIdentity *peer)
1436 struct GNUNET_MESH_PeerControl msg;
1437 GNUNET_PEER_Id peer_id;
1440 peer_id = GNUNET_PEER_intern (peer);
1441 for (i = 0; i < tunnel->npeers; i++)
1443 if (tunnel->peers[i]->id == peer_id)
1445 /* Peer already exists in tunnel */
1446 GNUNET_PEER_change_rc (peer_id, -1);
1451 if (NULL == add_peer_to_tunnel (tunnel, peer))
1454 msg.header.size = htons (sizeof (struct GNUNET_MESH_PeerControl));
1455 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD);
1456 msg.tunnel_id = htonl (tunnel->tid);
1458 send_packet (tunnel->mesh, &msg.header, tunnel);
1465 * Request that a peer should be removed from the tunnel. The existing
1466 * disconnect handler will be called ONCE if we were connected.
1468 * @param tunnel handle to existing tunnel
1469 * @param peer peer to remove
1472 GNUNET_MESH_peer_request_connect_del (struct GNUNET_MESH_Tunnel *tunnel,
1473 const struct GNUNET_PeerIdentity *peer)
1475 struct GNUNET_MESH_PeerControl msg;
1476 GNUNET_PEER_Id peer_id;
1479 peer_id = GNUNET_PEER_search (peer);
1485 for (i = 0; i < tunnel->npeers; i++)
1486 if (tunnel->peers[i]->id == peer_id)
1488 if (i == tunnel->npeers)
1493 if (NULL != tunnel->disconnect_handler && tunnel->peers[i]->connected == 1)
1494 tunnel->disconnect_handler (tunnel->cls, peer);
1495 GNUNET_PEER_change_rc (peer_id, -1);
1496 GNUNET_free (tunnel->peers[i]);
1497 tunnel->peers[i] = tunnel->peers[tunnel->npeers - 1];
1498 GNUNET_array_grow (tunnel->peers, tunnel->npeers, tunnel->npeers - 1);
1500 msg.header.size = htons (sizeof (struct GNUNET_MESH_PeerControl));
1501 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_DEL);
1502 msg.tunnel_id = htonl (tunnel->tid);
1503 memcpy (&msg.peer, peer, sizeof (struct GNUNET_PeerIdentity));
1504 send_packet (tunnel->mesh, &msg.header, tunnel);
1509 * Request that the mesh should try to connect to a peer supporting the given
1512 * @param tunnel handle to existing tunnel
1513 * @param app_type application type that must be supported by the peer (MESH
1514 * should discover peer in proximity handling this type)
1517 GNUNET_MESH_peer_request_connect_by_type (struct GNUNET_MESH_Tunnel *tunnel,
1518 GNUNET_MESH_ApplicationType app_type)
1520 struct GNUNET_MESH_ConnectPeerByType msg;
1522 GNUNET_array_append (tunnel->apps, tunnel->napps, app_type);
1524 msg.header.size = htons (sizeof (struct GNUNET_MESH_ConnectPeerByType));
1525 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD_BY_TYPE);
1526 msg.tunnel_id = htonl (tunnel->tid);
1527 msg.type = htonl (app_type);
1528 send_packet (tunnel->mesh, &msg.header, tunnel);
1533 * Ask the mesh to call "notify" once it is ready to transmit the
1534 * given number of bytes to the specified "target". If we are not yet
1535 * connected to the specified peer, a call to this function will cause
1536 * us to try to establish a connection.
1538 * @param tunnel tunnel to use for transmission
1539 * @param cork is corking allowed for this transmission?
1540 * @param priority how important is the message?
1541 * @param maxdelay how long can the message wait?
1542 * @param target destination for the message,
1543 * NULL for multicast to all tunnel targets
1544 * @param notify_size how many bytes of buffer space does notify want?
1545 * @param notify function to call when buffer space is available;
1546 * will be called with NULL on timeout or if the overall queue
1547 * for this peer is larger than queue_size and this is currently
1548 * the message with the lowest priority
1549 * @param notify_cls closure for notify
1550 * @return non-NULL if the notify callback was queued,
1551 * NULL if we can not even queue the request (insufficient
1552 * memory); if NULL is returned, "notify" will NOT be called.
1554 struct GNUNET_MESH_TransmitHandle *
1555 GNUNET_MESH_notify_transmit_ready (struct GNUNET_MESH_Tunnel *tunnel, int cork,
1557 struct GNUNET_TIME_Relative maxdelay,
1558 const struct GNUNET_PeerIdentity *target,
1560 GNUNET_CONNECTION_TransmitReadyNotify notify,
1563 struct GNUNET_MESH_TransmitHandle *th;
1564 struct GNUNET_MESH_TransmitHandle *least_priority_th;
1565 uint32_t least_priority;
1568 GNUNET_assert (NULL != tunnel);
1570 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1571 "mesh: mesh notify transmit ready called\n");
1573 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: target %s\n",
1574 GNUNET_i2s (target));
1576 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: target multicast\n");
1578 GNUNET_assert (NULL != notify);
1579 if (tunnel->mesh->npackets >= tunnel->mesh->max_queue_size &&
1580 tunnel->npackets > 0)
1585 th = tunnel->mesh->th_tail;
1586 least_priority = priority;
1587 least_priority_th = NULL;
1590 if (th->priority < least_priority && th->tunnel->npackets > 1)
1592 least_priority_th = th;
1593 least_priority = th->priority;
1597 if (NULL == least_priority_th)
1599 /* Can't be a control message */
1600 GNUNET_assert (NULL != least_priority_th->notify);
1601 least_priority_th->notify (notify_cls, 0, NULL);
1602 least_priority_th->tunnel->npackets--;
1603 tunnel->mesh->npackets--;
1604 GNUNET_CONTAINER_DLL_remove (tunnel->mesh->th_head, tunnel->mesh->th_tail,
1606 if (GNUNET_SCHEDULER_NO_TASK != least_priority_th->timeout_task)
1607 GNUNET_SCHEDULER_cancel (least_priority_th->timeout_task);
1608 GNUNET_free (least_priority_th);
1611 tunnel->mesh->npackets++;
1612 th = GNUNET_malloc (sizeof (struct GNUNET_MESH_TransmitHandle));
1613 th->tunnel = tunnel;
1614 th->priority = priority;
1615 th->timeout = GNUNET_TIME_relative_to_absolute (maxdelay);
1616 th->target = GNUNET_PEER_intern (target);
1617 if (tunnel->tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
1618 overhead = sizeof (struct GNUNET_MESH_ToOrigin);
1619 else if (NULL == target)
1620 overhead = sizeof (struct GNUNET_MESH_Multicast);
1622 overhead = sizeof (struct GNUNET_MESH_Unicast);
1623 th->size = notify_size + overhead;
1624 th->notify = notify;
1625 th->notify_cls = notify_cls;
1626 add_to_queue (tunnel->mesh, th);
1627 if (NULL != tunnel->mesh->th)
1630 GNUNET_CLIENT_notify_transmit_ready (tunnel->mesh->client, th->size,
1631 GNUNET_TIME_UNIT_FOREVER_REL,
1632 GNUNET_YES, &send_callback,
1639 * Cancel the specified transmission-ready notification.
1641 * @param th handle that was returned by "notify_transmit_ready".
1644 GNUNET_MESH_notify_transmit_ready_cancel (struct GNUNET_MESH_TransmitHandle *th)
1646 struct GNUNET_MESH_Handle *mesh;
1648 mesh = th->tunnel->mesh;
1649 if (th->timeout_task != GNUNET_SCHEDULER_NO_TASK)
1650 GNUNET_SCHEDULER_cancel (th->timeout_task);
1651 GNUNET_CONTAINER_DLL_remove (mesh->th_head, mesh->th_tail, th);
1653 if ((NULL == mesh->th_head) && (NULL != mesh->th))
1655 /* queue empty, no point in asking for transmission */
1656 GNUNET_CLIENT_notify_transmit_ready_cancel (mesh->th);
1663 * Transition API for tunnel ctx management
1666 GNUNET_MESH_tunnel_set_data (struct GNUNET_MESH_Tunnel *tunnel, void *data)
1672 * Transition API for tunnel ctx management
1675 GNUNET_MESH_tunnel_get_data (struct GNUNET_MESH_Tunnel *tunnel)
1681 #if 0 /* keep Emacsens' auto-indent happy */