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;
212 * Task for trying to reconnect.
214 GNUNET_SCHEDULER_TaskIdentifier reconnect_task;
219 * Description of a peer
221 struct GNUNET_MESH_Peer
224 * ID of the peer in short form
229 * Tunnel this peer belongs to
231 struct GNUNET_MESH_Tunnel *t;
234 * Flag indicating whether service has informed about its connection
242 * Opaque handle to a tunnel.
244 struct GNUNET_MESH_Tunnel
250 struct GNUNET_MESH_Tunnel *next;
251 struct GNUNET_MESH_Tunnel *prev;
254 * Callback to execute when peers connect to the tunnel
256 GNUNET_MESH_PeerConnectHandler connect_handler;
259 * Callback to execute when peers disconnect from the tunnel
261 GNUNET_MESH_PeerDisconnectHandler disconnect_handler;
264 * Closure for the connect/disconnect handlers
269 * Handle to the mesh this tunnel belongs to
271 struct GNUNET_MESH_Handle *mesh;
274 * Local ID of the tunnel
276 MESH_TunnelNumber tid;
279 * Owner of the tunnel. 0 if the tunnel is the local client.
281 GNUNET_PEER_Id owner;
284 * All peers added to the tunnel
286 struct GNUNET_MESH_Peer **peers;
289 * List of application types that have been requested for this tunnel
291 GNUNET_MESH_ApplicationType *apps;
294 * Any data the caller wants to put in here
299 * Number of peers added to the tunnel
304 * Number of packets queued in this tunnel
306 unsigned int npackets;
309 * Number of applications requested this tunnel
316 /******************************************************************************/
317 /*********************** AUXILIARY FUNCTIONS *************************/
318 /******************************************************************************/
321 * Get the tunnel handler for the tunnel specified by id from the given handle
322 * @param h Mesh handle
323 * @param tid ID of the wanted tunnel
324 * @return handle to the required tunnel or NULL if not found
326 static struct GNUNET_MESH_Tunnel *
327 retrieve_tunnel (struct GNUNET_MESH_Handle *h, MESH_TunnelNumber tid)
329 struct GNUNET_MESH_Tunnel *t;
343 * Create a new tunnel and insert it in the tunnel list of the mesh handle
344 * @param h Mesh handle
345 * @param tid desired tid of the tunnel, 0 to assign one automatically
346 * @return handle to the created tunnel
348 static struct GNUNET_MESH_Tunnel *
349 create_tunnel (struct GNUNET_MESH_Handle *h, MESH_TunnelNumber tid)
351 struct GNUNET_MESH_Tunnel *t;
353 t = GNUNET_malloc (sizeof (struct GNUNET_MESH_Tunnel));
354 GNUNET_CONTAINER_DLL_insert (h->tunnels_head, h->tunnels_tail, t);
358 t->tid = h->next_tid;
359 while (NULL != retrieve_tunnel (h, h->next_tid))
362 h->next_tid &= ~GNUNET_MESH_LOCAL_TUNNEL_ID_SERV;
363 h->next_tid |= GNUNET_MESH_LOCAL_TUNNEL_ID_CLI;
375 * Destroy the specified tunnel.
376 * - Destroys all peers, calling the disconnect callback on each if needed
377 * - Cancels all outgoing traffic for that tunnel, calling respective notifys
378 * - Calls cleaner if tunnel was inbound
379 * - Frees all memory used
381 * @param t Pointer to the tunnel.
382 * @param call_cleaner Whether to call the cleaner handler.
384 * @return Handle to the required tunnel or NULL if not found.
387 destroy_tunnel (struct GNUNET_MESH_Tunnel *t, int call_cleaner)
389 struct GNUNET_MESH_Handle *h;
390 struct GNUNET_PeerIdentity pi;
391 struct GNUNET_MESH_TransmitHandle *th;
392 struct GNUNET_MESH_TransmitHandle *next;
402 /* disconnect all peers */
403 GNUNET_CONTAINER_DLL_remove (h->tunnels_head, h->tunnels_tail, t);
404 for (i = 0; i < t->npeers; i++)
406 if ( (NULL != t->disconnect_handler) && t->peers[i]->connected)
408 GNUNET_PEER_resolve (t->peers[i]->id, &pi);
409 t->disconnect_handler (t->cls, &pi);
411 GNUNET_PEER_change_rc (t->peers[i]->id, -1);
412 GNUNET_free (t->peers[i]);
415 /* signal tunnel destruction */
416 if ( (NULL != h->cleaner) && (0 != t->owner) && (GNUNET_YES == call_cleaner) )
417 h->cleaner (h->cls, t, t->ctx);
419 /* check that clients did not leave messages behind in the queue */
420 for (th = h->th_head; NULL != th; th = next)
425 /* we should not really get here, as clients should have
426 aborted their requests already.
427 Management traffic should be ok, as clients can't cancel that */
428 GNUNET_break (NULL == th->notify);
429 GNUNET_CONTAINER_DLL_remove (h->th_head, h->th_tail, th);
431 /* clean up request */
432 if (GNUNET_SCHEDULER_NO_TASK != th->timeout_task)
433 GNUNET_SCHEDULER_cancel (th->timeout_task);
437 /* if there are no more pending requests with mesh service, cancel active request */
438 /* Note: this should be unnecessary... */
439 if ( (NULL == h->th_head) && (NULL != h->th))
441 GNUNET_CLIENT_notify_transmit_ready_cancel (h->th);
447 GNUNET_free (t->peers);
449 GNUNET_PEER_change_rc (t->owner, -1);
450 if (0 != t->napps && t->apps)
451 GNUNET_free (t->apps);
458 * Get the peer descriptor for the peer with id from the given tunnel
459 * @param t Tunnel handle
460 * @param id Short form ID of the wanted peer
461 * @return handle to the requested peer or NULL if not found
463 static struct GNUNET_MESH_Peer *
464 retrieve_peer (struct GNUNET_MESH_Tunnel *t, GNUNET_PEER_Id id)
468 for (i = 0; i < t->npeers; i++)
469 if (t->peers[i]->id == id)
476 * Add a peer into a tunnel
477 * @param t Tunnel handle
478 * @param pi Full ID of the new peer
479 * @return handle to the newly created peer
481 static struct GNUNET_MESH_Peer *
482 add_peer_to_tunnel (struct GNUNET_MESH_Tunnel *t,
483 const struct GNUNET_PeerIdentity *pi)
485 struct GNUNET_MESH_Peer *p;
493 id = GNUNET_PEER_intern (pi);
495 p = GNUNET_malloc (sizeof (struct GNUNET_MESH_Peer));
498 GNUNET_array_append (t->peers, t->npeers, p);
504 * Remove a peer from a tunnel
505 * @param p Peer handle
508 remove_peer_from_tunnel (struct GNUNET_MESH_Peer *p)
512 for (i = 0; i < p->t->npeers; i++)
514 if (p->t->peers[i] == p)
517 if (i == p->t->npeers)
522 p->t->peers[i] = p->t->peers[p->t->npeers - 1];
523 GNUNET_array_grow (p->t->peers, p->t->npeers, p->t->npeers - 1);
528 * Notify client that the transmission has timed out
530 * @param tc task context
533 timeout_transmission (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
535 struct GNUNET_MESH_TransmitHandle *th = cls;
536 struct GNUNET_MESH_Handle *mesh;
538 mesh = th->tunnel->mesh;
539 GNUNET_CONTAINER_DLL_remove (mesh->th_head, mesh->th_tail, th);
540 if (th->notify != NULL)
541 th->notify (th->notify_cls, 0, NULL);
543 if ((NULL == mesh->th_head) && (NULL != mesh->th))
545 /* queue empty, no point in asking for transmission */
546 GNUNET_CLIENT_notify_transmit_ready_cancel (mesh->th);
553 * Add a transmit handle to the transmission queue by priority and set the
556 * @param h mesh handle with the queue head and tail
557 * @param th handle to the packet to be transmitted
560 add_to_queue (struct GNUNET_MESH_Handle *h,
561 struct GNUNET_MESH_TransmitHandle *th)
563 struct GNUNET_MESH_TransmitHandle *p;
566 while ((NULL != p) && (th->priority <= p->priority))
572 GNUNET_CONTAINER_DLL_insert_after (h->th_head, h->th_tail, p, th);
573 if (GNUNET_TIME_UNIT_FOREVER_ABS.abs_value == th->timeout.abs_value)
576 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_absolute_get_remaining
577 (th->timeout), &timeout_transmission, th);
582 * Auxiliary function to send an already constructed packet to the service.
583 * Takes care of creating a new queue element, copying the message and
584 * calling the tmt_rdy function if necessary.
586 * @param h mesh handle
587 * @param msg message to transmit
588 * @param tunnel tunnel this send is related to (NULL if N/A)
591 send_packet (struct GNUNET_MESH_Handle *h,
592 const struct GNUNET_MessageHeader *msg,
593 struct GNUNET_MESH_Tunnel *tunnel);
597 * Reconnect callback: tries to reconnect again after a failer previous
599 * @param cls closure (mesh handle)
600 * @param tc task context
603 reconnect_cbk (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
607 * Send a connect packet to the service with the applications and types
608 * requested by the user.
610 * @param h The mesh handle.
614 send_connect (struct GNUNET_MESH_Handle *h)
618 size = sizeof (struct GNUNET_MESH_ClientConnect);
619 size += h->n_applications * sizeof (GNUNET_MESH_ApplicationType);
620 size += h->n_handlers * sizeof (uint16_t);
623 struct GNUNET_MESH_ClientConnect *msg;
624 GNUNET_MESH_ApplicationType *apps;
629 /* build connection packet */
630 msg = (struct GNUNET_MESH_ClientConnect *) buf;
631 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT);
632 msg->header.size = htons (size);
633 apps = (GNUNET_MESH_ApplicationType *) &msg[1];
634 for (napps = 0; napps < h->n_applications; napps++)
636 apps[napps] = htonl (h->applications[napps]);
637 LOG (GNUNET_ERROR_TYPE_DEBUG, " app %u\n", h->applications[napps]);
639 types = (uint16_t *) & apps[napps];
640 for (ntypes = 0; ntypes < h->n_handlers; ntypes++)
641 types[ntypes] = htons (h->message_handlers[ntypes].type);
642 msg->applications = htons (napps);
643 msg->types = htons (ntypes);
644 LOG (GNUNET_ERROR_TYPE_DEBUG,
645 "Sending %lu bytes long message %d types and %d apps\n",
646 ntohs (msg->header.size), ntypes, napps);
647 send_packet (h, &msg->header, NULL);
653 * Reconnect to the service, retransmit all infomation to try to restore the
656 * @param h handle to the mesh
658 * @return GNUNET_YES in case of sucess, GNUNET_NO otherwise (service down...)
661 do_reconnect (struct GNUNET_MESH_Handle *h)
663 struct GNUNET_MESH_Tunnel *t;
666 LOG (GNUNET_ERROR_TYPE_DEBUG, "*****************************\n");
667 LOG (GNUNET_ERROR_TYPE_DEBUG, "******* RECONNECT *******\n");
668 LOG (GNUNET_ERROR_TYPE_DEBUG, "*****************************\n");
670 h->in_receive = GNUNET_NO;
674 GNUNET_CLIENT_notify_transmit_ready_cancel (h->th);
677 if (NULL != h->client)
679 GNUNET_CLIENT_disconnect (h->client, GNUNET_NO);
683 h->client = GNUNET_CLIENT_connect ("mesh", h->cfg);
684 if (h->client == NULL)
686 h->reconnect_task = GNUNET_SCHEDULER_add_delayed (h->reconnect_time,
689 GNUNET_TIME_relative_min (GNUNET_TIME_UNIT_SECONDS,
690 GNUNET_TIME_relative_multiply
691 (h->reconnect_time, 2));
692 LOG (GNUNET_ERROR_TYPE_DEBUG, " Next retry in %sms\n",
693 GNUNET_TIME_relative_to_string (h->reconnect_time));
699 h->reconnect_time = GNUNET_TIME_UNIT_MILLISECONDS;
702 /* Rebuild all tunnels */
703 for (t = h->tunnels_head; NULL != t; t = t->next)
705 struct GNUNET_MESH_TunnelMessage tmsg;
706 struct GNUNET_MESH_PeerControl pmsg;
708 if (t->tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
710 /* Tunnel was created by service (incoming tunnel) */
711 /* TODO: Notify service of missing tunnel, to request
712 * creator to recreate path (find a path to him via DHT?)
716 tmsg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE);
717 tmsg.header.size = htons (sizeof (struct GNUNET_MESH_TunnelMessage));
718 tmsg.tunnel_id = htonl (t->tid);
719 send_packet (h, &tmsg.header, t);
721 pmsg.header.size = htons (sizeof (struct GNUNET_MESH_PeerControl));
722 pmsg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD);
723 pmsg.tunnel_id = htonl (t->tid);
725 /* Reconnect all peers */
726 for (i = 0; i < t->npeers; i++)
728 GNUNET_PEER_resolve (t->peers[i]->id, &pmsg.peer);
729 if (NULL != t->disconnect_handler && t->peers[i]->connected)
730 t->disconnect_handler (t->cls, &pmsg.peer);
731 /* If the tunnel was "by type", dont connect individual peers */
733 send_packet (t->mesh, &pmsg.header, t);
735 /* Reconnect all types, if any */
736 for (i = 0; i < t->napps; i++)
738 struct GNUNET_MESH_ConnectPeerByType msg;
740 msg.header.size = htons (sizeof (struct GNUNET_MESH_ConnectPeerByType));
741 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD_BY_TYPE);
742 msg.tunnel_id = htonl (t->tid);
743 msg.type = htonl (t->apps[i]);
744 send_packet (t->mesh, &msg.header, t);
751 * Reconnect callback: tries to reconnect again after a failer previous
753 * @param cls closure (mesh handle)
754 * @param tc task context
757 reconnect_cbk (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
759 struct GNUNET_MESH_Handle *h = cls;
761 h->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
762 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
769 * Reconnect to the service, retransmit all infomation to try to restore the
772 * @param h handle to the mesh
774 * @return GNUNET_YES in case of sucess, GNUNET_NO otherwise (service down...)
777 reconnect (struct GNUNET_MESH_Handle *h)
779 if (GNUNET_SCHEDULER_NO_TASK != h->reconnect_task)
780 GNUNET_SCHEDULER_add_delayed (h->reconnect_time, &reconnect_cbk, h);
784 /******************************************************************************/
785 /*********************** RECEIVE HANDLERS ****************************/
786 /******************************************************************************/
789 * Process the new tunnel notification and add it to the tunnels in the handle
791 * @param h The mesh handle
792 * @param msg A message with the details of the new incoming tunnel
795 process_tunnel_created (struct GNUNET_MESH_Handle *h,
796 const struct GNUNET_MESH_TunnelNotification *msg)
798 struct GNUNET_MESH_Tunnel *t;
799 MESH_TunnelNumber tid;
801 tid = ntohl (msg->tunnel_id);
802 if (tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
807 t = create_tunnel (h, tid);
808 t->owner = GNUNET_PEER_intern (&msg->peer);
810 t->peers = GNUNET_malloc (sizeof (struct GNUNET_MESH_Peer *));
811 t->peers[0] = GNUNET_malloc (sizeof (struct GNUNET_MESH_Peer));
813 t->peers[0]->connected = 1;
814 t->peers[0]->id = t->owner;
815 GNUNET_PEER_change_rc (t->owner, 1);
818 if (NULL != h->new_tunnel)
820 struct GNUNET_ATS_Information atsi;
824 t->ctx = h->new_tunnel (h->cls, t, &msg->peer, &atsi);
826 LOG (GNUNET_ERROR_TYPE_DEBUG, "new incoming tunnel %X\n", t->tid);
832 * Process the tunnel destroy notification and free associated resources
834 * @param h The mesh handle
835 * @param msg A message with the details of the tunnel being destroyed
838 process_tunnel_destroy (struct GNUNET_MESH_Handle *h,
839 const struct GNUNET_MESH_TunnelMessage *msg)
841 struct GNUNET_MESH_Tunnel *t;
842 MESH_TunnelNumber tid;
844 tid = ntohl (msg->tunnel_id);
845 t = retrieve_tunnel (h, tid);
855 LOG (GNUNET_ERROR_TYPE_DEBUG, "tunnel %u destroyed\n", t->tid);
856 destroy_tunnel (t, GNUNET_YES);
862 * Process the new peer event and notify the upper level of it
864 * @param h The mesh handle
865 * @param msg A message with the details of the peer event
868 process_peer_event (struct GNUNET_MESH_Handle *h,
869 const struct GNUNET_MESH_PeerControl *msg)
871 struct GNUNET_MESH_Tunnel *t;
872 struct GNUNET_MESH_Peer *p;
873 struct GNUNET_ATS_Information atsi;
877 LOG (GNUNET_ERROR_TYPE_DEBUG, "processig peer event\n");
878 size = ntohs (msg->header.size);
879 if (size != sizeof (struct GNUNET_MESH_PeerControl))
884 t = retrieve_tunnel (h, ntohl (msg->tunnel_id));
890 id = GNUNET_PEER_search (&msg->peer);
891 if ((p = retrieve_peer (t, id)) == NULL)
892 p = add_peer_to_tunnel (t, &msg->peer);
893 if (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD == ntohs (msg->header.type))
895 LOG (GNUNET_ERROR_TYPE_DEBUG, "adding peer\n");
896 if (NULL != t->connect_handler)
900 t->connect_handler (t->cls, &msg->peer, &atsi);
906 LOG (GNUNET_ERROR_TYPE_DEBUG, "removing peer\n");
907 if (NULL != t->disconnect_handler && p->connected)
909 t->disconnect_handler (t->cls, &msg->peer);
911 remove_peer_from_tunnel (p);
914 LOG (GNUNET_ERROR_TYPE_DEBUG, "processing peer event END\n");
919 * Process the incoming data packets
921 * @param h The mesh handle
922 * @param message A message encapsulating the data
924 * @return GNUNET_YES if everything went fine
925 * GNUNET_NO if client closed connection (h no longer valid)
928 process_incoming_data (struct GNUNET_MESH_Handle *h,
929 const struct GNUNET_MessageHeader *message)
931 const struct GNUNET_MessageHeader *payload;
932 const struct GNUNET_MESH_MessageHandler *handler;
933 const struct GNUNET_PeerIdentity *peer;
934 struct GNUNET_MESH_Unicast *ucast;
935 struct GNUNET_MESH_Multicast *mcast;
936 struct GNUNET_MESH_ToOrigin *to_orig;
937 struct GNUNET_MESH_Tunnel *t;
941 LOG (GNUNET_ERROR_TYPE_DEBUG, "Got a data message!\n");
942 type = ntohs (message->type);
945 case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
946 ucast = (struct GNUNET_MESH_Unicast *) message;
948 t = retrieve_tunnel (h, ntohl (ucast->tid));
949 payload = (struct GNUNET_MessageHeader *) &ucast[1];
951 LOG (GNUNET_ERROR_TYPE_DEBUG, " ucast on tunnel %s [%x]\n",
952 GNUNET_i2s (peer), ntohl (ucast->tid));
954 case GNUNET_MESSAGE_TYPE_MESH_MULTICAST:
955 mcast = (struct GNUNET_MESH_Multicast *) message;
956 t = retrieve_tunnel (h, ntohl (mcast->tid));
957 payload = (struct GNUNET_MessageHeader *) &mcast[1];
959 LOG (GNUNET_ERROR_TYPE_DEBUG, " mcast on tunnel %s [%x]\n",
960 GNUNET_i2s (peer), ntohl (mcast->tid));
962 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
963 to_orig = (struct GNUNET_MESH_ToOrigin *) message;
964 t = retrieve_tunnel (h, ntohl (to_orig->tid));
965 payload = (struct GNUNET_MessageHeader *) &to_orig[1];
966 peer = &to_orig->sender;
967 LOG (GNUNET_ERROR_TYPE_DEBUG, " torig on tunnel %s [%x]\n",
968 GNUNET_i2s (peer), ntohl (to_orig->tid));
979 type = ntohs (payload->type);
980 for (i = 0; i < h->n_handlers; i++)
982 handler = &h->message_handlers[i];
983 if (handler->type == type)
985 struct GNUNET_ATS_Information atsi;
990 handler->callback (h->cls, t, &t->ctx, peer, payload, &atsi))
992 LOG (GNUNET_ERROR_TYPE_DEBUG, "MESH: callback caused disconnection\n");
993 GNUNET_MESH_disconnect (h);
998 LOG (GNUNET_ERROR_TYPE_DEBUG,
999 "MESH: callback completed successfully\n");
1009 * Function to process all messages received from the service
1011 * @param cls closure
1012 * @param msg message received, NULL on timeout or fatal error
1015 msg_received (void *cls, const struct GNUNET_MessageHeader *msg)
1017 struct GNUNET_MESH_Handle *h = cls;
1021 LOG (GNUNET_ERROR_TYPE_DEBUG, "Received NULL msg\n");
1025 LOG (GNUNET_ERROR_TYPE_DEBUG, "received a message type %hu from MESH\n",
1027 switch (ntohs (msg->type))
1029 /* Notify of a new incoming tunnel */
1030 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE:
1031 process_tunnel_created (h, (struct GNUNET_MESH_TunnelNotification *) msg);
1033 /* Notify of a tunnel disconnection */
1034 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY:
1035 process_tunnel_destroy (h, (struct GNUNET_MESH_TunnelMessage *) msg);
1037 /* Notify of a new peer or a peer disconnect in the tunnel */
1038 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD:
1039 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_DEL:
1040 process_peer_event (h, (struct GNUNET_MESH_PeerControl *) msg);
1042 /* Notify of a new data packet in the tunnel */
1043 case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
1044 case GNUNET_MESSAGE_TYPE_MESH_MULTICAST:
1045 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
1046 if (GNUNET_NO == process_incoming_data (h, msg))
1049 /* We shouldn't get any other packages, log and ignore */
1051 LOG (GNUNET_ERROR_TYPE_WARNING,
1052 "MESH: unsolicited message form service (type %d)\n",
1055 LOG (GNUNET_ERROR_TYPE_DEBUG, "message processed\n");
1056 GNUNET_CLIENT_receive (h->client, &msg_received, h,
1057 GNUNET_TIME_UNIT_FOREVER_REL);
1061 /******************************************************************************/
1062 /************************ SEND FUNCTIONS ****************************/
1063 /******************************************************************************/
1066 * Function called to send a message to the service.
1067 * "buf" will be NULL and "size" zero if the socket was closed for writing in
1070 * @param cls closure, the mesh handle
1071 * @param size number of bytes available in buf
1072 * @param buf where the callee should write the connect message
1073 * @return number of bytes written to buf
1076 send_callback (void *cls, size_t size, void *buf)
1078 struct GNUNET_MESH_Handle *h = cls;
1079 struct GNUNET_MESH_TransmitHandle *th;
1084 LOG (GNUNET_ERROR_TYPE_DEBUG, "Send packet() Buffer %u\n", size);
1086 if ((0 == size) || (NULL == buf))
1088 LOG (GNUNET_ERROR_TYPE_DEBUG, "Received NULL callback\n");
1093 while ((NULL != (th = h->th_head)) && (size >= th->size))
1095 if (NULL != th->notify)
1097 if (th->tunnel->tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
1099 /* traffic to origin */
1100 struct GNUNET_MESH_ToOrigin to;
1101 struct GNUNET_MessageHeader *mh;
1103 GNUNET_assert (size >= th->size);
1104 mh = (struct GNUNET_MessageHeader *) &cbuf[sizeof (to)];
1105 psize = th->notify (th->notify_cls, size - sizeof (to), mh);
1106 LOG (GNUNET_ERROR_TYPE_DEBUG, " to origin, type %u\n",
1110 psize += sizeof (to);
1111 GNUNET_assert (size >= psize);
1112 to.header.size = htons (psize);
1113 to.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN);
1114 to.tid = htonl (th->tunnel->tid);
1115 memset (&to.oid, 0, sizeof (struct GNUNET_PeerIdentity));
1116 memset (&to.sender, 0, sizeof (struct GNUNET_PeerIdentity));
1117 memcpy (cbuf, &to, sizeof (to));
1120 else if (th->target == 0)
1123 struct GNUNET_MESH_Multicast mc;
1124 struct GNUNET_MessageHeader *mh;
1126 GNUNET_assert (size >= th->size);
1127 mh = (struct GNUNET_MessageHeader *) &cbuf[sizeof (mc)];
1128 psize = th->notify (th->notify_cls, size - sizeof (mc), mh);
1129 LOG (GNUNET_ERROR_TYPE_DEBUG, " multicast, type %u\n",
1133 psize += sizeof (mc);
1134 GNUNET_assert (size >= psize);
1135 mc.header.size = htons (psize);
1136 mc.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_MULTICAST);
1137 mc.tid = htonl (th->tunnel->tid);
1140 memset (&mc.oid, 0, sizeof (struct GNUNET_PeerIdentity));
1141 memcpy (cbuf, &mc, sizeof (mc));
1147 struct GNUNET_MESH_Unicast uc;
1148 struct GNUNET_MessageHeader *mh;
1150 GNUNET_assert (size >= th->size);
1151 mh = (struct GNUNET_MessageHeader *) &cbuf[sizeof (uc)];
1152 psize = th->notify (th->notify_cls, size - sizeof (uc), mh);
1153 LOG (GNUNET_ERROR_TYPE_DEBUG, " unicast, type %u\n",
1157 psize += sizeof (uc);
1158 GNUNET_assert (size >= psize);
1159 uc.header.size = htons (psize);
1160 uc.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_UNICAST);
1161 uc.tid = htonl (th->tunnel->tid);
1162 memset (&uc.oid, 0, sizeof (struct GNUNET_PeerIdentity));
1163 GNUNET_PEER_resolve (th->target, &uc.destination);
1164 memcpy (cbuf, &uc, sizeof (uc));
1170 memcpy (cbuf, &th[1], th->size);
1173 if (th->timeout_task != GNUNET_SCHEDULER_NO_TASK)
1174 GNUNET_SCHEDULER_cancel (th->timeout_task);
1175 if (NULL != th->notify)
1177 th->tunnel->mesh->npackets--;
1178 th->tunnel->npackets--;
1180 GNUNET_CONTAINER_DLL_remove (h->th_head, h->th_tail, th);
1186 LOG (GNUNET_ERROR_TYPE_DEBUG, " total size: %u\n", tsize);
1187 if (NULL != (th = h->th_head))
1189 LOG (GNUNET_ERROR_TYPE_DEBUG, " next size: %u\n", th->size);
1192 GNUNET_CLIENT_notify_transmit_ready (h->client, th->size,
1193 GNUNET_TIME_UNIT_FOREVER_REL,
1194 GNUNET_YES, &send_callback, h);
1196 LOG (GNUNET_ERROR_TYPE_DEBUG, "Send packet() END\n");
1197 if (GNUNET_NO == h->in_receive)
1199 h->in_receive = GNUNET_YES;
1200 GNUNET_CLIENT_receive (h->client, &msg_received, h,
1201 GNUNET_TIME_UNIT_FOREVER_REL);
1208 * Auxiliary function to send an already constructed packet to the service.
1209 * Takes care of creating a new queue element, copying the message and
1210 * calling the tmt_rdy function if necessary.
1212 * @param h mesh handle
1213 * @param msg message to transmit
1214 * @param tunnel tunnel this send is related to (NULL if N/A)
1217 send_packet (struct GNUNET_MESH_Handle *h,
1218 const struct GNUNET_MessageHeader *msg,
1219 struct GNUNET_MESH_Tunnel *tunnel)
1221 struct GNUNET_MESH_TransmitHandle *th;
1224 msize = ntohs (msg->size);
1225 th = GNUNET_malloc (sizeof (struct GNUNET_MESH_TransmitHandle) + msize);
1226 th->priority = UINT32_MAX;
1227 th->timeout = GNUNET_TIME_UNIT_FOREVER_ABS;
1229 th->tunnel = tunnel;
1230 memcpy (&th[1], msg, msize);
1231 add_to_queue (h, th);
1235 GNUNET_CLIENT_notify_transmit_ready (h->client, msize,
1236 GNUNET_TIME_UNIT_FOREVER_REL,
1237 GNUNET_YES, &send_callback, h);
1241 /******************************************************************************/
1242 /********************** API CALL DEFINITIONS *************************/
1243 /******************************************************************************/
1246 * Connect to the mesh service.
1248 * @param cfg configuration to use
1249 * @param queue_size size of the data message queue, shared among all tunnels
1250 * (each tunnel is guaranteed to accept at least one message,
1251 * no matter what is the status of other tunnels)
1252 * @param cls closure for the various callbacks that follow
1253 * (including handlers in the handlers array)
1254 * @param new_tunnel function called when an *inbound* tunnel is created
1255 * @param cleaner function called when an *inbound* tunnel is destroyed by the
1256 * remote peer, it is *not* called if GNUNET_MESH_tunnel_destroy
1257 * is called on the tunnel
1258 * @param handlers callbacks for messages we care about, NULL-terminated
1259 * note that the mesh is allowed to drop notifications about
1260 * inbound messages if the client does not process them fast
1261 * enough (for this notification type, a bounded queue is used)
1262 * @param stypes list of the applications that this client claims to provide
1263 * @return handle to the mesh service NULL on error
1264 * (in this case, init is never called)
1266 struct GNUNET_MESH_Handle *
1267 GNUNET_MESH_connect (const struct GNUNET_CONFIGURATION_Handle *cfg,
1268 unsigned int queue_size, void *cls,
1269 GNUNET_MESH_InboundTunnelNotificationHandler new_tunnel,
1270 GNUNET_MESH_TunnelEndHandler cleaner,
1271 const struct GNUNET_MESH_MessageHandler *handlers,
1272 const GNUNET_MESH_ApplicationType *stypes)
1274 struct GNUNET_MESH_Handle *h;
1276 LOG (GNUNET_ERROR_TYPE_DEBUG, "GNUNET_MESH_connect()\n");
1277 h = GNUNET_malloc (sizeof (struct GNUNET_MESH_Handle));
1279 h->max_queue_size = queue_size;
1280 h->new_tunnel = new_tunnel;
1281 h->cleaner = cleaner;
1282 h->client = GNUNET_CLIENT_connect ("mesh", cfg);
1283 if (h->client == NULL)
1291 h->applications = stypes;
1292 h->message_handlers = handlers;
1293 h->next_tid = GNUNET_MESH_LOCAL_TUNNEL_ID_CLI;
1294 h->reconnect_time = GNUNET_TIME_UNIT_MILLISECONDS;
1296 /* count handlers and apps, calculate size */
1297 for (h->n_applications = 0; stypes[h->n_applications]; h->n_applications++) ;
1298 for (h->n_handlers = 0; handlers[h->n_handlers].type; h->n_handlers++) ;
1300 LOG (GNUNET_ERROR_TYPE_DEBUG, "GNUNET_MESH_connect() END\n");
1306 * Disconnect from the mesh service. All tunnels will be destroyed. All tunnel
1307 * disconnect callbacks will be called on any still connected peers, notifying
1308 * about their disconnection. The registered inbound tunnel cleaner will be
1309 * called should any inbound tunnels still exist.
1311 * @param handle connection to mesh to disconnect
1314 GNUNET_MESH_disconnect (struct GNUNET_MESH_Handle *handle)
1316 struct GNUNET_MESH_Tunnel *t;
1317 struct GNUNET_MESH_Tunnel *aux;
1318 struct GNUNET_MESH_TransmitHandle *th;
1320 t = handle->tunnels_head;
1324 if (t->tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
1327 LOG (GNUNET_ERROR_TYPE_DEBUG, "tunnel %X not destroyed\n", t->tid);
1329 destroy_tunnel (t, GNUNET_YES);
1332 while ( (th = handle->th_head) != NULL)
1334 struct GNUNET_MessageHeader *msg;
1336 /* Make sure it is an allowed packet (everything else should have been
1337 * already canceled).
1339 GNUNET_break (UINT32_MAX == th->priority);
1340 GNUNET_break (NULL == th->notify);
1341 msg = (struct GNUNET_MessageHeader *) &th[1];
1342 switch (ntohs(msg->type))
1344 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT:
1345 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY:
1349 LOG (GNUNET_ERROR_TYPE_DEBUG, "unexpected msg %u\n",
1353 GNUNET_CONTAINER_DLL_remove (handle->th_head, handle->th_tail, th);
1357 if (NULL != handle->th)
1359 GNUNET_CLIENT_notify_transmit_ready_cancel (handle->th);
1362 if (NULL != handle->client)
1364 GNUNET_CLIENT_disconnect (handle->client, GNUNET_NO);
1365 handle->client = NULL;
1367 if (GNUNET_SCHEDULER_NO_TASK != handle->reconnect_task)
1369 GNUNET_SCHEDULER_cancel(handle->reconnect_task);
1370 handle->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
1372 GNUNET_free (handle);
1377 * Create a new tunnel (we're initiator and will be allowed to add/remove peers
1378 * and to broadcast).
1380 * @param h mesh handle
1381 * @param tunnel_ctx client's tunnel context to associate with the tunnel
1382 * @param connect_handler function to call when peers are actually connected
1383 * @param disconnect_handler function to call when peers are disconnected
1384 * @param handler_cls closure for connect/disconnect handlers
1386 struct GNUNET_MESH_Tunnel *
1387 GNUNET_MESH_tunnel_create (struct GNUNET_MESH_Handle *h, void *tunnel_ctx,
1388 GNUNET_MESH_PeerConnectHandler connect_handler,
1389 GNUNET_MESH_PeerDisconnectHandler disconnect_handler,
1392 struct GNUNET_MESH_Tunnel *t;
1393 struct GNUNET_MESH_TunnelMessage msg;
1395 LOG (GNUNET_ERROR_TYPE_DEBUG, "Creating new tunnel\n");
1396 t = create_tunnel (h, 0);
1397 t->connect_handler = connect_handler;
1398 t->disconnect_handler = disconnect_handler;
1399 t->cls = handler_cls;
1400 t->ctx = tunnel_ctx;
1401 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE);
1402 msg.header.size = htons (sizeof (struct GNUNET_MESH_TunnelMessage));
1403 msg.tunnel_id = htonl (t->tid);
1404 send_packet (h, &msg.header, t);
1410 * Destroy an existing tunnel. The existing callback for the tunnel will NOT
1413 * @param tunnel tunnel handle
1416 GNUNET_MESH_tunnel_destroy (struct GNUNET_MESH_Tunnel *tunnel)
1418 struct GNUNET_MESH_Handle *h;
1419 struct GNUNET_MESH_TunnelMessage msg;
1420 struct GNUNET_MESH_TransmitHandle *th;
1422 LOG (GNUNET_ERROR_TYPE_DEBUG, "Destroying tunnel\n");
1425 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY);
1426 msg.header.size = htons (sizeof (struct GNUNET_MESH_TunnelMessage));
1427 msg.tunnel_id = htonl (tunnel->tid);
1431 struct GNUNET_MESH_TransmitHandle *aux;
1432 if (th->tunnel == tunnel)
1435 /* FIXME call the handler? */
1436 if (NULL != th->notify)
1437 th->notify (th->notify_cls, 0, NULL);
1438 GNUNET_CONTAINER_DLL_remove (h->th_head, h->th_tail, th);
1446 destroy_tunnel (tunnel, GNUNET_NO);
1447 send_packet (h, &msg.header, tunnel);
1452 * Request that a peer should be added to the tunnel. The existing
1453 * connect handler will be called ONCE with either success or failure.
1454 * This function should NOT be called again with the same peer before the
1455 * connect handler is called.
1457 * @param tunnel handle to existing tunnel
1458 * @param peer peer to add
1461 GNUNET_MESH_peer_request_connect_add (struct GNUNET_MESH_Tunnel *tunnel,
1462 const struct GNUNET_PeerIdentity *peer)
1464 struct GNUNET_MESH_PeerControl msg;
1465 GNUNET_PEER_Id peer_id;
1468 peer_id = GNUNET_PEER_intern (peer);
1469 for (i = 0; i < tunnel->npeers; i++)
1471 if (tunnel->peers[i]->id == peer_id)
1473 /* Peer already exists in tunnel */
1474 GNUNET_PEER_change_rc (peer_id, -1);
1479 if (NULL == add_peer_to_tunnel (tunnel, peer))
1482 msg.header.size = htons (sizeof (struct GNUNET_MESH_PeerControl));
1483 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD);
1484 msg.tunnel_id = htonl (tunnel->tid);
1486 send_packet (tunnel->mesh, &msg.header, tunnel);
1493 * Request that a peer should be removed from the tunnel. The existing
1494 * disconnect handler will be called ONCE if we were connected.
1496 * @param tunnel handle to existing tunnel
1497 * @param peer peer to remove
1500 GNUNET_MESH_peer_request_connect_del (struct GNUNET_MESH_Tunnel *tunnel,
1501 const struct GNUNET_PeerIdentity *peer)
1503 struct GNUNET_MESH_PeerControl msg;
1504 GNUNET_PEER_Id peer_id;
1507 peer_id = GNUNET_PEER_search (peer);
1513 for (i = 0; i < tunnel->npeers; i++)
1514 if (tunnel->peers[i]->id == peer_id)
1516 if (i == tunnel->npeers)
1521 if (NULL != tunnel->disconnect_handler && tunnel->peers[i]->connected == 1)
1522 tunnel->disconnect_handler (tunnel->cls, peer);
1523 GNUNET_PEER_change_rc (peer_id, -1);
1524 GNUNET_free (tunnel->peers[i]);
1525 tunnel->peers[i] = tunnel->peers[tunnel->npeers - 1];
1526 GNUNET_array_grow (tunnel->peers, tunnel->npeers, tunnel->npeers - 1);
1528 msg.header.size = htons (sizeof (struct GNUNET_MESH_PeerControl));
1529 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_DEL);
1530 msg.tunnel_id = htonl (tunnel->tid);
1531 memcpy (&msg.peer, peer, sizeof (struct GNUNET_PeerIdentity));
1532 send_packet (tunnel->mesh, &msg.header, tunnel);
1537 * Request that the mesh should try to connect to a peer supporting the given
1540 * @param tunnel handle to existing tunnel
1541 * @param app_type application type that must be supported by the peer (MESH
1542 * should discover peer in proximity handling this type)
1545 GNUNET_MESH_peer_request_connect_by_type (struct GNUNET_MESH_Tunnel *tunnel,
1546 GNUNET_MESH_ApplicationType app_type)
1548 struct GNUNET_MESH_ConnectPeerByType msg;
1550 GNUNET_array_append (tunnel->apps, tunnel->napps, app_type);
1552 msg.header.size = htons (sizeof (struct GNUNET_MESH_ConnectPeerByType));
1553 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD_BY_TYPE);
1554 msg.tunnel_id = htonl (tunnel->tid);
1555 msg.type = htonl (app_type);
1556 send_packet (tunnel->mesh, &msg.header, tunnel);
1561 * Ask the mesh to call "notify" once it is ready to transmit the
1562 * given number of bytes to the specified "target". If we are not yet
1563 * connected to the specified peer, a call to this function will cause
1564 * us to try to establish a connection.
1566 * @param tunnel tunnel to use for transmission
1567 * @param cork is corking allowed for this transmission?
1568 * @param priority how important is the message?
1569 * @param maxdelay how long can the message wait?
1570 * @param target destination for the message,
1571 * NULL for multicast to all tunnel targets
1572 * @param notify_size how many bytes of buffer space does notify want?
1573 * @param notify function to call when buffer space is available;
1574 * will be called with NULL on timeout or if the overall queue
1575 * for this peer is larger than queue_size and this is currently
1576 * the message with the lowest priority
1577 * @param notify_cls closure for notify
1578 * @return non-NULL if the notify callback was queued,
1579 * NULL if we can not even queue the request (insufficient
1580 * memory); if NULL is returned, "notify" will NOT be called.
1582 struct GNUNET_MESH_TransmitHandle *
1583 GNUNET_MESH_notify_transmit_ready (struct GNUNET_MESH_Tunnel *tunnel, int cork,
1585 struct GNUNET_TIME_Relative maxdelay,
1586 const struct GNUNET_PeerIdentity *target,
1588 GNUNET_CONNECTION_TransmitReadyNotify notify,
1591 struct GNUNET_MESH_TransmitHandle *th;
1592 struct GNUNET_MESH_TransmitHandle *least_priority_th;
1593 uint32_t least_priority;
1596 GNUNET_assert (NULL != tunnel);
1597 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh notify transmit ready called\n");
1599 LOG (GNUNET_ERROR_TYPE_DEBUG, " target %s\n", GNUNET_i2s (target));
1601 LOG (GNUNET_ERROR_TYPE_DEBUG, " target multicast\n");
1602 GNUNET_assert (NULL != notify);
1603 if (tunnel->mesh->npackets >= tunnel->mesh->max_queue_size &&
1604 tunnel->npackets > 0)
1609 th = tunnel->mesh->th_tail;
1610 least_priority = priority;
1611 least_priority_th = NULL;
1614 if (th->priority < least_priority && th->tunnel->npackets > 1)
1616 least_priority_th = th;
1617 least_priority = th->priority;
1621 if (NULL == least_priority_th)
1623 /* Can't be a control message */
1624 GNUNET_assert (NULL != least_priority_th->notify);
1625 least_priority_th->notify (notify_cls, 0, NULL);
1626 least_priority_th->tunnel->npackets--;
1627 tunnel->mesh->npackets--;
1628 GNUNET_CONTAINER_DLL_remove (tunnel->mesh->th_head, tunnel->mesh->th_tail,
1630 if (GNUNET_SCHEDULER_NO_TASK != least_priority_th->timeout_task)
1631 GNUNET_SCHEDULER_cancel (least_priority_th->timeout_task);
1632 GNUNET_free (least_priority_th);
1635 tunnel->mesh->npackets++;
1636 th = GNUNET_malloc (sizeof (struct GNUNET_MESH_TransmitHandle));
1637 th->tunnel = tunnel;
1638 th->priority = priority;
1639 th->timeout = GNUNET_TIME_relative_to_absolute (maxdelay);
1640 th->target = GNUNET_PEER_intern (target);
1641 if (tunnel->tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
1642 overhead = sizeof (struct GNUNET_MESH_ToOrigin);
1643 else if (NULL == target)
1644 overhead = sizeof (struct GNUNET_MESH_Multicast);
1646 overhead = sizeof (struct GNUNET_MESH_Unicast);
1647 th->size = notify_size + overhead;
1648 th->notify = notify;
1649 th->notify_cls = notify_cls;
1650 add_to_queue (tunnel->mesh, th);
1651 if (NULL != tunnel->mesh->th)
1654 GNUNET_CLIENT_notify_transmit_ready (tunnel->mesh->client, th->size,
1655 GNUNET_TIME_UNIT_FOREVER_REL,
1656 GNUNET_YES, &send_callback,
1663 * Cancel the specified transmission-ready notification.
1665 * @param th handle that was returned by "notify_transmit_ready".
1668 GNUNET_MESH_notify_transmit_ready_cancel (struct GNUNET_MESH_TransmitHandle *th)
1670 struct GNUNET_MESH_Handle *mesh;
1672 mesh = th->tunnel->mesh;
1673 if (th->timeout_task != GNUNET_SCHEDULER_NO_TASK)
1674 GNUNET_SCHEDULER_cancel (th->timeout_task);
1675 GNUNET_CONTAINER_DLL_remove (mesh->th_head, mesh->th_tail, th);
1677 if ((NULL == mesh->th_head) && (NULL != mesh->th))
1679 /* queue empty, no point in asking for transmission */
1680 GNUNET_CLIENT_notify_transmit_ready_cancel (mesh->th);
1687 * Transition API for tunnel ctx management
1690 GNUNET_MESH_tunnel_set_data (struct GNUNET_MESH_Tunnel *tunnel, void *data)
1696 * Transition API for tunnel ctx management
1699 GNUNET_MESH_tunnel_get_data (struct GNUNET_MESH_Tunnel *tunnel)
1705 #if 0 /* keep Emacsens' auto-indent happy */