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 /* Clients should have aborted their requests already.
426 * Management traffic should be ok, as clients can't cancel that */
427 GNUNET_break (NULL == th->notify);
428 GNUNET_CONTAINER_DLL_remove (h->th_head, h->th_tail, th);
430 /* clean up request */
431 if (GNUNET_SCHEDULER_NO_TASK != th->timeout_task)
432 GNUNET_SCHEDULER_cancel (th->timeout_task);
436 /* if there are no more pending requests with mesh service, cancel active request */
437 /* Note: this should be unnecessary... */
438 if ( (NULL == h->th_head) && (NULL != h->th))
440 GNUNET_CLIENT_notify_transmit_ready_cancel (h->th);
446 GNUNET_free (t->peers);
448 GNUNET_PEER_change_rc (t->owner, -1);
449 if (0 != t->napps && t->apps)
450 GNUNET_free (t->apps);
457 * Get the peer descriptor for the peer with id from the given tunnel
458 * @param t Tunnel handle
459 * @param id Short form ID of the wanted peer
460 * @return handle to the requested peer or NULL if not found
462 static struct GNUNET_MESH_Peer *
463 retrieve_peer (struct GNUNET_MESH_Tunnel *t, GNUNET_PEER_Id id)
467 for (i = 0; i < t->npeers; i++)
468 if (t->peers[i]->id == id)
475 * Add a peer into a tunnel
476 * @param t Tunnel handle
477 * @param pi Full ID of the new peer
478 * @return handle to the newly created peer
480 static struct GNUNET_MESH_Peer *
481 add_peer_to_tunnel (struct GNUNET_MESH_Tunnel *t,
482 const struct GNUNET_PeerIdentity *pi)
484 struct GNUNET_MESH_Peer *p;
492 id = GNUNET_PEER_intern (pi);
494 p = GNUNET_malloc (sizeof (struct GNUNET_MESH_Peer));
497 GNUNET_array_append (t->peers, t->npeers, p);
503 * Remove a peer from a tunnel
504 * @param p Peer handle
507 remove_peer_from_tunnel (struct GNUNET_MESH_Peer *p)
511 for (i = 0; i < p->t->npeers; i++)
513 if (p->t->peers[i] == p)
516 if (i == p->t->npeers)
521 p->t->peers[i] = p->t->peers[p->t->npeers - 1];
522 GNUNET_array_grow (p->t->peers, p->t->npeers, p->t->npeers - 1);
527 * Notify client that the transmission has timed out
529 * @param tc task context
532 timeout_transmission (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
534 struct GNUNET_MESH_TransmitHandle *th = cls;
535 struct GNUNET_MESH_Handle *mesh;
537 mesh = th->tunnel->mesh;
538 GNUNET_CONTAINER_DLL_remove (mesh->th_head, mesh->th_tail, th);
539 if (th->notify != NULL)
540 th->notify (th->notify_cls, 0, NULL);
542 if ((NULL == mesh->th_head) && (NULL != mesh->th))
544 /* queue empty, no point in asking for transmission */
545 GNUNET_CLIENT_notify_transmit_ready_cancel (mesh->th);
552 * Add a transmit handle to the transmission queue by priority and set the
555 * @param h mesh handle with the queue head and tail
556 * @param th handle to the packet to be transmitted
559 add_to_queue (struct GNUNET_MESH_Handle *h,
560 struct GNUNET_MESH_TransmitHandle *th)
562 struct GNUNET_MESH_TransmitHandle *p;
565 while ((NULL != p) && (th->priority <= p->priority))
571 GNUNET_CONTAINER_DLL_insert_after (h->th_head, h->th_tail, p, th);
572 if (GNUNET_TIME_UNIT_FOREVER_ABS.abs_value == th->timeout.abs_value)
575 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_absolute_get_remaining
576 (th->timeout), &timeout_transmission, th);
581 * Auxiliary function to send an already constructed packet to the service.
582 * Takes care of creating a new queue element, copying the message and
583 * calling the tmt_rdy function if necessary.
585 * @param h mesh handle
586 * @param msg message to transmit
587 * @param tunnel tunnel this send is related to (NULL if N/A)
590 send_packet (struct GNUNET_MESH_Handle *h,
591 const struct GNUNET_MessageHeader *msg,
592 struct GNUNET_MESH_Tunnel *tunnel);
596 * Reconnect callback: tries to reconnect again after a failer previous
598 * @param cls closure (mesh handle)
599 * @param tc task context
602 reconnect_cbk (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
606 * Send a connect packet to the service with the applications and types
607 * requested by the user.
609 * @param h The mesh handle.
613 send_connect (struct GNUNET_MESH_Handle *h)
617 size = sizeof (struct GNUNET_MESH_ClientConnect);
618 size += h->n_applications * sizeof (GNUNET_MESH_ApplicationType);
619 size += h->n_handlers * sizeof (uint16_t);
621 char buf[size] GNUNET_ALIGN;
622 struct GNUNET_MESH_ClientConnect *msg;
623 GNUNET_MESH_ApplicationType *apps;
628 /* build connection packet */
629 msg = (struct GNUNET_MESH_ClientConnect *) buf;
630 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT);
631 msg->header.size = htons (size);
632 apps = (GNUNET_MESH_ApplicationType *) &msg[1];
633 for (napps = 0; napps < h->n_applications; napps++)
635 apps[napps] = htonl (h->applications[napps]);
636 LOG (GNUNET_ERROR_TYPE_DEBUG, " app %u\n", h->applications[napps]);
638 types = (uint16_t *) & apps[napps];
639 for (ntypes = 0; ntypes < h->n_handlers; ntypes++)
640 types[ntypes] = htons (h->message_handlers[ntypes].type);
641 msg->applications = htons (napps);
642 msg->types = htons (ntypes);
643 LOG (GNUNET_ERROR_TYPE_DEBUG,
644 "Sending %lu bytes long message %d types and %d apps\n",
645 ntohs (msg->header.size), ntypes, napps);
646 send_packet (h, &msg->header, NULL);
652 * Reconnect to the service, retransmit all infomation to try to restore the
655 * @param h handle to the mesh
657 * @return GNUNET_YES in case of sucess, GNUNET_NO otherwise (service down...)
660 do_reconnect (struct GNUNET_MESH_Handle *h)
662 struct GNUNET_MESH_Tunnel *t;
665 LOG (GNUNET_ERROR_TYPE_DEBUG, "*****************************\n");
666 LOG (GNUNET_ERROR_TYPE_DEBUG, "******* RECONNECT *******\n");
667 LOG (GNUNET_ERROR_TYPE_DEBUG, "*****************************\n");
669 h->in_receive = GNUNET_NO;
673 GNUNET_CLIENT_notify_transmit_ready_cancel (h->th);
676 if (NULL != h->client)
678 GNUNET_CLIENT_disconnect (h->client);
682 h->client = GNUNET_CLIENT_connect ("mesh", h->cfg);
683 if (h->client == NULL)
685 h->reconnect_task = GNUNET_SCHEDULER_add_delayed (h->reconnect_time,
688 GNUNET_TIME_relative_min (GNUNET_TIME_UNIT_SECONDS,
689 GNUNET_TIME_relative_multiply
690 (h->reconnect_time, 2));
691 LOG (GNUNET_ERROR_TYPE_DEBUG, " Next retry in %sms\n",
692 GNUNET_TIME_relative_to_string (h->reconnect_time));
698 h->reconnect_time = GNUNET_TIME_UNIT_MILLISECONDS;
701 /* Rebuild all tunnels */
702 for (t = h->tunnels_head; NULL != t; t = t->next)
704 struct GNUNET_MESH_TunnelMessage tmsg;
705 struct GNUNET_MESH_PeerControl pmsg;
707 if (t->tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
709 /* Tunnel was created by service (incoming tunnel) */
710 /* TODO: Notify service of missing tunnel, to request
711 * creator to recreate path (find a path to him via DHT?)
715 tmsg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE);
716 tmsg.header.size = htons (sizeof (struct GNUNET_MESH_TunnelMessage));
717 tmsg.tunnel_id = htonl (t->tid);
718 send_packet (h, &tmsg.header, t);
720 pmsg.header.size = htons (sizeof (struct GNUNET_MESH_PeerControl));
721 pmsg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD);
722 pmsg.tunnel_id = htonl (t->tid);
724 /* Reconnect all peers */
725 for (i = 0; i < t->npeers; i++)
727 GNUNET_PEER_resolve (t->peers[i]->id, &pmsg.peer);
728 if (NULL != t->disconnect_handler && t->peers[i]->connected)
729 t->disconnect_handler (t->cls, &pmsg.peer);
730 /* If the tunnel was "by type", dont connect individual peers */
732 send_packet (t->mesh, &pmsg.header, t);
734 /* Reconnect all types, if any */
735 for (i = 0; i < t->napps; i++)
737 struct GNUNET_MESH_ConnectPeerByType msg;
739 msg.header.size = htons (sizeof (struct GNUNET_MESH_ConnectPeerByType));
740 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD_BY_TYPE);
741 msg.tunnel_id = htonl (t->tid);
742 msg.type = htonl (t->apps[i]);
743 send_packet (t->mesh, &msg.header, t);
750 * Reconnect callback: tries to reconnect again after a failer previous
752 * @param cls closure (mesh handle)
753 * @param tc task context
756 reconnect_cbk (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
758 struct GNUNET_MESH_Handle *h = cls;
760 h->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
761 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
768 * Reconnect to the service, retransmit all infomation to try to restore the
771 * @param h handle to the mesh
773 * @return GNUNET_YES in case of sucess, GNUNET_NO otherwise (service down...)
776 reconnect (struct GNUNET_MESH_Handle *h)
778 LOG (GNUNET_ERROR_TYPE_DEBUG, "Requested RECONNECT\n");
779 if (GNUNET_SCHEDULER_NO_TASK == h->reconnect_task)
780 h->reconnect_task = GNUNET_SCHEDULER_add_delayed (h->reconnect_time,
785 /******************************************************************************/
786 /*********************** RECEIVE HANDLERS ****************************/
787 /******************************************************************************/
790 * Process the new tunnel notification and add it to the tunnels in the handle
792 * @param h The mesh handle
793 * @param msg A message with the details of the new incoming tunnel
796 process_tunnel_created (struct GNUNET_MESH_Handle *h,
797 const struct GNUNET_MESH_TunnelNotification *msg)
799 struct GNUNET_MESH_Tunnel *t;
800 MESH_TunnelNumber tid;
802 tid = ntohl (msg->tunnel_id);
803 if (tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
808 if (NULL != h->new_tunnel)
810 struct GNUNET_ATS_Information atsi;
812 t = create_tunnel (h, tid);
813 t->owner = GNUNET_PEER_intern (&msg->peer);
815 t->peers = GNUNET_malloc (sizeof (struct GNUNET_MESH_Peer *));
816 t->peers[0] = GNUNET_malloc (sizeof (struct GNUNET_MESH_Peer));
818 t->peers[0]->connected = 1;
819 t->peers[0]->id = t->owner;
820 GNUNET_PEER_change_rc (t->owner, 1);
825 t->ctx = h->new_tunnel (h->cls, t, &msg->peer, &atsi);
826 LOG (GNUNET_ERROR_TYPE_DEBUG, "new incoming tunnel %X\n", t->tid);
830 struct GNUNET_MESH_TunnelMessage d_msg;
832 LOG (GNUNET_ERROR_TYPE_DEBUG, "No handler for incoming tunnels\n");
834 d_msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY);
835 d_msg.header.size = htons (sizeof (struct GNUNET_MESH_TunnelMessage));
836 d_msg.tunnel_id = msg->tunnel_id;
838 send_packet (h, &d_msg.header, NULL);
845 * Process the tunnel destroy notification and free associated resources
847 * @param h The mesh handle
848 * @param msg A message with the details of the tunnel being destroyed
851 process_tunnel_destroy (struct GNUNET_MESH_Handle *h,
852 const struct GNUNET_MESH_TunnelMessage *msg)
854 struct GNUNET_MESH_Tunnel *t;
855 MESH_TunnelNumber tid;
857 tid = ntohl (msg->tunnel_id);
858 t = retrieve_tunnel (h, tid);
868 LOG (GNUNET_ERROR_TYPE_DEBUG, "tunnel %X destroyed\n", t->tid);
869 destroy_tunnel (t, GNUNET_YES);
875 * Process the new peer event and notify the upper level of it
877 * @param h The mesh handle
878 * @param msg A message with the details of the peer event
881 process_peer_event (struct GNUNET_MESH_Handle *h,
882 const struct GNUNET_MESH_PeerControl *msg)
884 struct GNUNET_MESH_Tunnel *t;
885 struct GNUNET_MESH_Peer *p;
886 struct GNUNET_ATS_Information atsi;
890 LOG (GNUNET_ERROR_TYPE_DEBUG, "processig peer event\n");
891 size = ntohs (msg->header.size);
892 if (size != sizeof (struct GNUNET_MESH_PeerControl))
897 t = retrieve_tunnel (h, ntohl (msg->tunnel_id));
903 id = GNUNET_PEER_search (&msg->peer);
904 if ((p = retrieve_peer (t, id)) == NULL)
905 p = add_peer_to_tunnel (t, &msg->peer);
906 if (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD == ntohs (msg->header.type))
908 LOG (GNUNET_ERROR_TYPE_DEBUG, "adding peer\n");
909 if (NULL != t->connect_handler)
913 t->connect_handler (t->cls, &msg->peer, &atsi);
919 LOG (GNUNET_ERROR_TYPE_DEBUG, "removing peer\n");
920 if (NULL != t->disconnect_handler && p->connected)
922 t->disconnect_handler (t->cls, &msg->peer);
924 remove_peer_from_tunnel (p);
927 LOG (GNUNET_ERROR_TYPE_DEBUG, "processing peer event END\n");
932 * Process the incoming data packets
934 * @param h The mesh handle
935 * @param message A message encapsulating the data
937 * @return GNUNET_YES if everything went fine
938 * GNUNET_NO if client closed connection (h no longer valid)
941 process_incoming_data (struct GNUNET_MESH_Handle *h,
942 const struct GNUNET_MessageHeader *message)
944 const struct GNUNET_MessageHeader *payload;
945 const struct GNUNET_MESH_MessageHandler *handler;
946 const struct GNUNET_PeerIdentity *peer;
947 struct GNUNET_MESH_Unicast *ucast;
948 struct GNUNET_MESH_Multicast *mcast;
949 struct GNUNET_MESH_ToOrigin *to_orig;
950 struct GNUNET_MESH_Tunnel *t;
954 LOG (GNUNET_ERROR_TYPE_DEBUG, "Got a data message!\n");
955 type = ntohs (message->type);
958 case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
959 ucast = (struct GNUNET_MESH_Unicast *) message;
961 t = retrieve_tunnel (h, ntohl (ucast->tid));
962 payload = (struct GNUNET_MessageHeader *) &ucast[1];
964 LOG (GNUNET_ERROR_TYPE_DEBUG, " ucast on tunnel %s [%x]\n",
965 GNUNET_i2s (peer), ntohl (ucast->tid));
967 case GNUNET_MESSAGE_TYPE_MESH_MULTICAST:
968 mcast = (struct GNUNET_MESH_Multicast *) message;
969 t = retrieve_tunnel (h, ntohl (mcast->tid));
970 payload = (struct GNUNET_MessageHeader *) &mcast[1];
972 LOG (GNUNET_ERROR_TYPE_DEBUG, " mcast on tunnel %s [%x]\n",
973 GNUNET_i2s (peer), ntohl (mcast->tid));
975 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
976 to_orig = (struct GNUNET_MESH_ToOrigin *) message;
977 t = retrieve_tunnel (h, ntohl (to_orig->tid));
978 payload = (struct GNUNET_MessageHeader *) &to_orig[1];
979 peer = &to_orig->sender;
980 LOG (GNUNET_ERROR_TYPE_DEBUG, " torig on tunnel %s [%x]\n",
981 GNUNET_i2s (peer), ntohl (to_orig->tid));
989 /* Tunnel was ignored, probably service didn't get it yet */
992 type = ntohs (payload->type);
993 for (i = 0; i < h->n_handlers; i++)
995 handler = &h->message_handlers[i];
996 if (handler->type == type)
998 struct GNUNET_ATS_Information atsi;
1003 handler->callback (h->cls, t, &t->ctx, peer, payload, &atsi))
1005 LOG (GNUNET_ERROR_TYPE_DEBUG, "MESH: callback caused disconnection\n");
1006 GNUNET_MESH_disconnect (h);
1011 LOG (GNUNET_ERROR_TYPE_DEBUG,
1012 "MESH: callback completed successfully\n");
1022 * Function to process all messages received from the service
1024 * @param cls closure
1025 * @param msg message received, NULL on timeout or fatal error
1028 msg_received (void *cls, const struct GNUNET_MessageHeader *msg)
1030 struct GNUNET_MESH_Handle *h = cls;
1034 LOG (GNUNET_ERROR_TYPE_DEBUG, "Received NULL msg\n");
1038 LOG (GNUNET_ERROR_TYPE_DEBUG, "received a message type %hu from MESH\n",
1040 switch (ntohs (msg->type))
1042 /* Notify of a new incoming tunnel */
1043 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE:
1044 process_tunnel_created (h, (struct GNUNET_MESH_TunnelNotification *) msg);
1046 /* Notify of a tunnel disconnection */
1047 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY:
1048 process_tunnel_destroy (h, (struct GNUNET_MESH_TunnelMessage *) msg);
1050 /* Notify of a new peer or a peer disconnect in the tunnel */
1051 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD:
1052 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_DEL:
1053 process_peer_event (h, (struct GNUNET_MESH_PeerControl *) msg);
1055 /* Notify of a new data packet in the tunnel */
1056 case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
1057 case GNUNET_MESSAGE_TYPE_MESH_MULTICAST:
1058 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
1059 if (GNUNET_NO == process_incoming_data (h, msg))
1062 /* We shouldn't get any other packages, log and ignore */
1064 LOG (GNUNET_ERROR_TYPE_WARNING,
1065 "MESH: unsolicited message form service (type %d)\n",
1068 LOG (GNUNET_ERROR_TYPE_DEBUG, "message processed\n");
1069 GNUNET_CLIENT_receive (h->client, &msg_received, h,
1070 GNUNET_TIME_UNIT_FOREVER_REL);
1074 /******************************************************************************/
1075 /************************ SEND FUNCTIONS ****************************/
1076 /******************************************************************************/
1079 * Function called to send a message to the service.
1080 * "buf" will be NULL and "size" zero if the socket was closed for writing in
1083 * @param cls closure, the mesh handle
1084 * @param size number of bytes available in buf
1085 * @param buf where the callee should write the connect message
1086 * @return number of bytes written to buf
1089 send_callback (void *cls, size_t size, void *buf)
1091 struct GNUNET_MESH_Handle *h = cls;
1092 struct GNUNET_MESH_TransmitHandle *th;
1097 LOG (GNUNET_ERROR_TYPE_DEBUG, "Send packet() Buffer %u\n", size);
1099 if ((0 == size) || (NULL == buf))
1101 LOG (GNUNET_ERROR_TYPE_DEBUG, "Received NULL callback\n");
1106 while ((NULL != (th = h->th_head)) && (size >= th->size))
1108 if (NULL != th->notify)
1110 if (th->tunnel->tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
1112 /* traffic to origin */
1113 struct GNUNET_MESH_ToOrigin to;
1114 struct GNUNET_MessageHeader *mh;
1116 GNUNET_assert (size >= th->size);
1117 mh = (struct GNUNET_MessageHeader *) &cbuf[sizeof (to)];
1118 psize = th->notify (th->notify_cls, size - sizeof (to), mh);
1119 LOG (GNUNET_ERROR_TYPE_DEBUG, " to origin, type %u\n",
1123 psize += sizeof (to);
1124 GNUNET_assert (size >= psize);
1125 to.header.size = htons (psize);
1126 to.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN);
1127 to.tid = htonl (th->tunnel->tid);
1128 memset (&to.oid, 0, sizeof (struct GNUNET_PeerIdentity));
1129 memset (&to.sender, 0, sizeof (struct GNUNET_PeerIdentity));
1130 memcpy (cbuf, &to, sizeof (to));
1133 else if (th->target == 0)
1136 struct GNUNET_MESH_Multicast mc;
1137 struct GNUNET_MessageHeader *mh;
1139 GNUNET_assert (size >= th->size);
1140 mh = (struct GNUNET_MessageHeader *) &cbuf[sizeof (mc)];
1141 psize = th->notify (th->notify_cls, size - sizeof (mc), mh);
1142 LOG (GNUNET_ERROR_TYPE_DEBUG, " multicast, type %u\n",
1146 psize += sizeof (mc);
1147 GNUNET_assert (size >= psize);
1148 mc.header.size = htons (psize);
1149 mc.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_MULTICAST);
1150 mc.tid = htonl (th->tunnel->tid);
1153 memset (&mc.oid, 0, sizeof (struct GNUNET_PeerIdentity));
1154 memcpy (cbuf, &mc, sizeof (mc));
1160 struct GNUNET_MESH_Unicast uc;
1161 struct GNUNET_MessageHeader *mh;
1163 GNUNET_assert (size >= th->size);
1164 mh = (struct GNUNET_MessageHeader *) &cbuf[sizeof (uc)];
1165 psize = th->notify (th->notify_cls, size - sizeof (uc), mh);
1166 LOG (GNUNET_ERROR_TYPE_DEBUG, " unicast, type %u\n",
1170 psize += sizeof (uc);
1171 GNUNET_assert (size >= psize);
1172 uc.header.size = htons (psize);
1173 uc.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_UNICAST);
1174 uc.tid = htonl (th->tunnel->tid);
1175 memset (&uc.oid, 0, sizeof (struct GNUNET_PeerIdentity));
1176 GNUNET_PEER_resolve (th->target, &uc.destination);
1177 memcpy (cbuf, &uc, sizeof (uc));
1183 memcpy (cbuf, &th[1], th->size);
1186 if (th->timeout_task != GNUNET_SCHEDULER_NO_TASK)
1187 GNUNET_SCHEDULER_cancel (th->timeout_task);
1188 if (NULL != th->notify)
1190 th->tunnel->mesh->npackets--;
1191 th->tunnel->npackets--;
1193 GNUNET_CONTAINER_DLL_remove (h->th_head, h->th_tail, th);
1199 LOG (GNUNET_ERROR_TYPE_DEBUG, " total size: %u\n", tsize);
1200 if (NULL != (th = h->th_head))
1202 LOG (GNUNET_ERROR_TYPE_DEBUG, " next size: %u\n", th->size);
1205 GNUNET_CLIENT_notify_transmit_ready (h->client, th->size,
1206 GNUNET_TIME_UNIT_FOREVER_REL,
1207 GNUNET_YES, &send_callback, h);
1209 LOG (GNUNET_ERROR_TYPE_DEBUG, "Send packet() END\n");
1210 if (GNUNET_NO == h->in_receive)
1212 h->in_receive = GNUNET_YES;
1213 GNUNET_CLIENT_receive (h->client, &msg_received, h,
1214 GNUNET_TIME_UNIT_FOREVER_REL);
1221 * Auxiliary function to send an already constructed packet to the service.
1222 * Takes care of creating a new queue element, copying the message and
1223 * calling the tmt_rdy function if necessary.
1225 * @param h mesh handle
1226 * @param msg message to transmit
1227 * @param tunnel tunnel this send is related to (NULL if N/A)
1230 send_packet (struct GNUNET_MESH_Handle *h,
1231 const struct GNUNET_MessageHeader *msg,
1232 struct GNUNET_MESH_Tunnel *tunnel)
1234 struct GNUNET_MESH_TransmitHandle *th;
1237 msize = ntohs (msg->size);
1238 th = GNUNET_malloc (sizeof (struct GNUNET_MESH_TransmitHandle) + msize);
1239 th->priority = UINT32_MAX;
1240 th->timeout = GNUNET_TIME_UNIT_FOREVER_ABS;
1242 th->tunnel = tunnel;
1243 memcpy (&th[1], msg, msize);
1244 add_to_queue (h, th);
1248 GNUNET_CLIENT_notify_transmit_ready (h->client, msize,
1249 GNUNET_TIME_UNIT_FOREVER_REL,
1250 GNUNET_YES, &send_callback, h);
1254 /******************************************************************************/
1255 /********************** API CALL DEFINITIONS *************************/
1256 /******************************************************************************/
1259 * Connect to the mesh service.
1261 * @param cfg configuration to use
1262 * @param queue_size size of the data message queue, shared among all tunnels
1263 * (each tunnel is guaranteed to accept at least one message,
1264 * no matter what is the status of other tunnels)
1265 * @param cls closure for the various callbacks that follow
1266 * (including handlers in the handlers array)
1267 * @param new_tunnel function called when an *inbound* tunnel is created
1268 * @param cleaner function called when an *inbound* tunnel is destroyed by the
1269 * remote peer, it is *not* called if GNUNET_MESH_tunnel_destroy
1270 * is called on the tunnel
1271 * @param handlers callbacks for messages we care about, NULL-terminated
1272 * note that the mesh is allowed to drop notifications about
1273 * inbound messages if the client does not process them fast
1274 * enough (for this notification type, a bounded queue is used)
1275 * @param stypes list of the applications that this client claims to provide
1276 * @return handle to the mesh service NULL on error
1277 * (in this case, init is never called)
1279 struct GNUNET_MESH_Handle *
1280 GNUNET_MESH_connect (const struct GNUNET_CONFIGURATION_Handle *cfg,
1281 unsigned int queue_size, void *cls,
1282 GNUNET_MESH_InboundTunnelNotificationHandler new_tunnel,
1283 GNUNET_MESH_TunnelEndHandler cleaner,
1284 const struct GNUNET_MESH_MessageHandler *handlers,
1285 const GNUNET_MESH_ApplicationType *stypes)
1287 struct GNUNET_MESH_Handle *h;
1289 LOG (GNUNET_ERROR_TYPE_DEBUG, "GNUNET_MESH_connect()\n");
1290 h = GNUNET_malloc (sizeof (struct GNUNET_MESH_Handle));
1292 h->max_queue_size = queue_size;
1293 h->new_tunnel = new_tunnel;
1294 h->cleaner = cleaner;
1295 h->client = GNUNET_CLIENT_connect ("mesh", cfg);
1296 if (h->client == NULL)
1304 h->applications = stypes;
1305 h->message_handlers = handlers;
1306 h->next_tid = GNUNET_MESH_LOCAL_TUNNEL_ID_CLI;
1307 h->reconnect_time = GNUNET_TIME_UNIT_MILLISECONDS;
1308 h->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
1310 /* count handlers and apps, calculate size */
1311 for (h->n_applications = 0; stypes[h->n_applications]; h->n_applications++) ;
1312 for (h->n_handlers = 0; handlers[h->n_handlers].type; h->n_handlers++) ;
1314 LOG (GNUNET_ERROR_TYPE_DEBUG, "GNUNET_MESH_connect() END\n");
1320 * Disconnect from the mesh service. All tunnels will be destroyed. All tunnel
1321 * disconnect callbacks will be called on any still connected peers, notifying
1322 * about their disconnection. The registered inbound tunnel cleaner will be
1323 * called should any inbound tunnels still exist.
1325 * @param handle connection to mesh to disconnect
1328 GNUNET_MESH_disconnect (struct GNUNET_MESH_Handle *handle)
1330 struct GNUNET_MESH_Tunnel *t;
1331 struct GNUNET_MESH_Tunnel *aux;
1332 struct GNUNET_MESH_TransmitHandle *th;
1334 t = handle->tunnels_head;
1338 if (t->tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
1341 LOG (GNUNET_ERROR_TYPE_DEBUG, "tunnel %X not destroyed\n", t->tid);
1343 destroy_tunnel (t, GNUNET_YES);
1346 while ( (th = handle->th_head) != NULL)
1348 struct GNUNET_MessageHeader *msg;
1350 /* Make sure it is an allowed packet (everything else should have been
1351 * already canceled).
1353 GNUNET_break (UINT32_MAX == th->priority);
1354 GNUNET_break (NULL == th->notify);
1355 msg = (struct GNUNET_MessageHeader *) &th[1];
1356 switch (ntohs(msg->type))
1358 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT:
1359 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY:
1363 LOG (GNUNET_ERROR_TYPE_DEBUG, "unexpected msg %u\n",
1367 GNUNET_CONTAINER_DLL_remove (handle->th_head, handle->th_tail, th);
1371 if (NULL != handle->th)
1373 GNUNET_CLIENT_notify_transmit_ready_cancel (handle->th);
1376 if (NULL != handle->client)
1378 GNUNET_CLIENT_disconnect (handle->client);
1379 handle->client = NULL;
1381 if (GNUNET_SCHEDULER_NO_TASK != handle->reconnect_task)
1383 GNUNET_SCHEDULER_cancel(handle->reconnect_task);
1384 handle->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
1386 GNUNET_free (handle);
1391 * Create a new tunnel (we're initiator and will be allowed to add/remove peers
1392 * and to broadcast).
1394 * @param h mesh handle
1395 * @param tunnel_ctx client's tunnel context to associate with the tunnel
1396 * @param connect_handler function to call when peers are actually connected
1397 * @param disconnect_handler function to call when peers are disconnected
1398 * @param handler_cls closure for connect/disconnect handlers
1400 struct GNUNET_MESH_Tunnel *
1401 GNUNET_MESH_tunnel_create (struct GNUNET_MESH_Handle *h, void *tunnel_ctx,
1402 GNUNET_MESH_PeerConnectHandler connect_handler,
1403 GNUNET_MESH_PeerDisconnectHandler disconnect_handler,
1406 struct GNUNET_MESH_Tunnel *t;
1407 struct GNUNET_MESH_TunnelMessage msg;
1409 LOG (GNUNET_ERROR_TYPE_DEBUG, "Creating new tunnel\n");
1410 t = create_tunnel (h, 0);
1411 t->connect_handler = connect_handler;
1412 t->disconnect_handler = disconnect_handler;
1413 t->cls = handler_cls;
1414 t->ctx = tunnel_ctx;
1415 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE);
1416 msg.header.size = htons (sizeof (struct GNUNET_MESH_TunnelMessage));
1417 msg.tunnel_id = htonl (t->tid);
1418 send_packet (h, &msg.header, t);
1424 * Destroy an existing tunnel. The existing callback for the tunnel will NOT
1427 * @param tunnel tunnel handle
1430 GNUNET_MESH_tunnel_destroy (struct GNUNET_MESH_Tunnel *tunnel)
1432 struct GNUNET_MESH_Handle *h;
1433 struct GNUNET_MESH_TunnelMessage msg;
1434 struct GNUNET_MESH_TransmitHandle *th;
1436 LOG (GNUNET_ERROR_TYPE_DEBUG, "Destroying tunnel\n");
1439 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY);
1440 msg.header.size = htons (sizeof (struct GNUNET_MESH_TunnelMessage));
1441 msg.tunnel_id = htonl (tunnel->tid);
1445 struct GNUNET_MESH_TransmitHandle *aux;
1446 if (th->tunnel == tunnel)
1449 /* FIXME call the handler? */
1450 if (NULL != th->notify)
1451 th->notify (th->notify_cls, 0, NULL);
1452 GNUNET_CONTAINER_DLL_remove (h->th_head, h->th_tail, th);
1460 destroy_tunnel (tunnel, GNUNET_NO);
1461 send_packet (h, &msg.header, NULL);
1466 * Request that a peer should be added to the tunnel. The existing
1467 * connect handler will be called ONCE with either success or failure.
1468 * This function should NOT be called again with the same peer before the
1469 * connect handler is called.
1471 * @param tunnel handle to existing tunnel
1472 * @param peer peer to add
1475 GNUNET_MESH_peer_request_connect_add (struct GNUNET_MESH_Tunnel *tunnel,
1476 const struct GNUNET_PeerIdentity *peer)
1478 struct GNUNET_MESH_PeerControl msg;
1479 GNUNET_PEER_Id peer_id;
1482 peer_id = GNUNET_PEER_intern (peer);
1483 for (i = 0; i < tunnel->npeers; i++)
1485 if (tunnel->peers[i]->id == peer_id)
1487 /* Peer already exists in tunnel */
1488 GNUNET_PEER_change_rc (peer_id, -1);
1493 if (NULL == add_peer_to_tunnel (tunnel, peer))
1496 msg.header.size = htons (sizeof (struct GNUNET_MESH_PeerControl));
1497 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD);
1498 msg.tunnel_id = htonl (tunnel->tid);
1500 send_packet (tunnel->mesh, &msg.header, tunnel);
1507 * Request that a peer should be removed from the tunnel. The existing
1508 * disconnect handler will be called ONCE if we were connected.
1510 * @param tunnel handle to existing tunnel
1511 * @param peer peer to remove
1514 GNUNET_MESH_peer_request_connect_del (struct GNUNET_MESH_Tunnel *tunnel,
1515 const struct GNUNET_PeerIdentity *peer)
1517 struct GNUNET_MESH_PeerControl msg;
1518 GNUNET_PEER_Id peer_id;
1521 peer_id = GNUNET_PEER_search (peer);
1527 for (i = 0; i < tunnel->npeers; i++)
1528 if (tunnel->peers[i]->id == peer_id)
1530 if (i == tunnel->npeers)
1535 if (NULL != tunnel->disconnect_handler && tunnel->peers[i]->connected == 1)
1536 tunnel->disconnect_handler (tunnel->cls, peer);
1537 GNUNET_PEER_change_rc (peer_id, -1);
1538 GNUNET_free (tunnel->peers[i]);
1539 tunnel->peers[i] = tunnel->peers[tunnel->npeers - 1];
1540 GNUNET_array_grow (tunnel->peers, tunnel->npeers, tunnel->npeers - 1);
1542 msg.header.size = htons (sizeof (struct GNUNET_MESH_PeerControl));
1543 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_DEL);
1544 msg.tunnel_id = htonl (tunnel->tid);
1545 memcpy (&msg.peer, peer, sizeof (struct GNUNET_PeerIdentity));
1546 send_packet (tunnel->mesh, &msg.header, tunnel);
1551 * Request that the mesh should try to connect to a peer supporting the given
1554 * @param tunnel handle to existing tunnel
1555 * @param app_type application type that must be supported by the peer (MESH
1556 * should discover peer in proximity handling this type)
1559 GNUNET_MESH_peer_request_connect_by_type (struct GNUNET_MESH_Tunnel *tunnel,
1560 GNUNET_MESH_ApplicationType app_type)
1562 struct GNUNET_MESH_ConnectPeerByType msg;
1564 GNUNET_array_append (tunnel->apps, tunnel->napps, app_type);
1566 LOG (GNUNET_ERROR_TYPE_DEBUG, "* CONNECT BY TYPE *\n");
1567 msg.header.size = htons (sizeof (struct GNUNET_MESH_ConnectPeerByType));
1568 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD_BY_TYPE);
1569 msg.tunnel_id = htonl (tunnel->tid);
1570 msg.type = htonl (app_type);
1571 send_packet (tunnel->mesh, &msg.header, tunnel);
1576 * Ask the mesh to call "notify" once it is ready to transmit the
1577 * given number of bytes to the specified "target". If we are not yet
1578 * connected to the specified peer, a call to this function will cause
1579 * us to try to establish a connection.
1581 * @param tunnel tunnel to use for transmission
1582 * @param cork is corking allowed for this transmission?
1583 * @param priority how important is the message?
1584 * @param maxdelay how long can the message wait?
1585 * @param target destination for the message,
1586 * NULL for multicast to all tunnel targets
1587 * @param notify_size how many bytes of buffer space does notify want?
1588 * @param notify function to call when buffer space is available;
1589 * will be called with NULL on timeout or if the overall queue
1590 * for this peer is larger than queue_size and this is currently
1591 * the message with the lowest priority
1592 * @param notify_cls closure for notify
1593 * @return non-NULL if the notify callback was queued,
1594 * NULL if we can not even queue the request (insufficient
1595 * memory); if NULL is returned, "notify" will NOT be called.
1597 struct GNUNET_MESH_TransmitHandle *
1598 GNUNET_MESH_notify_transmit_ready (struct GNUNET_MESH_Tunnel *tunnel, int cork,
1600 struct GNUNET_TIME_Relative maxdelay,
1601 const struct GNUNET_PeerIdentity *target,
1603 GNUNET_CONNECTION_TransmitReadyNotify notify,
1606 struct GNUNET_MESH_TransmitHandle *th;
1607 struct GNUNET_MESH_TransmitHandle *least_priority_th;
1608 uint32_t least_priority;
1611 GNUNET_assert (NULL != tunnel);
1612 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh notify transmit ready called\n");
1614 LOG (GNUNET_ERROR_TYPE_DEBUG, " target %s\n", GNUNET_i2s (target));
1616 LOG (GNUNET_ERROR_TYPE_DEBUG, " target multicast\n");
1617 GNUNET_assert (NULL != notify);
1618 if (tunnel->mesh->npackets >= tunnel->mesh->max_queue_size &&
1619 tunnel->npackets > 0)
1624 th = tunnel->mesh->th_tail;
1625 least_priority = priority;
1626 least_priority_th = NULL;
1629 if (th->priority < least_priority && th->tunnel->npackets > 1)
1631 least_priority_th = th;
1632 least_priority = th->priority;
1636 if (NULL == least_priority_th)
1638 /* Can't be a control message */
1639 GNUNET_assert (NULL != least_priority_th->notify);
1640 least_priority_th->notify (notify_cls, 0, NULL);
1641 least_priority_th->tunnel->npackets--;
1642 tunnel->mesh->npackets--;
1643 GNUNET_CONTAINER_DLL_remove (tunnel->mesh->th_head, tunnel->mesh->th_tail,
1645 if (GNUNET_SCHEDULER_NO_TASK != least_priority_th->timeout_task)
1646 GNUNET_SCHEDULER_cancel (least_priority_th->timeout_task);
1647 GNUNET_free (least_priority_th);
1650 tunnel->mesh->npackets++;
1651 th = GNUNET_malloc (sizeof (struct GNUNET_MESH_TransmitHandle));
1652 th->tunnel = tunnel;
1653 th->priority = priority;
1654 th->timeout = GNUNET_TIME_relative_to_absolute (maxdelay);
1655 th->target = GNUNET_PEER_intern (target);
1656 if (tunnel->tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
1657 overhead = sizeof (struct GNUNET_MESH_ToOrigin);
1658 else if (NULL == target)
1659 overhead = sizeof (struct GNUNET_MESH_Multicast);
1661 overhead = sizeof (struct GNUNET_MESH_Unicast);
1662 th->size = notify_size + overhead;
1663 th->notify = notify;
1664 th->notify_cls = notify_cls;
1665 add_to_queue (tunnel->mesh, th);
1666 if (NULL != tunnel->mesh->th)
1669 GNUNET_CLIENT_notify_transmit_ready (tunnel->mesh->client, th->size,
1670 GNUNET_TIME_UNIT_FOREVER_REL,
1671 GNUNET_YES, &send_callback,
1678 * Cancel the specified transmission-ready notification.
1680 * @param th handle that was returned by "notify_transmit_ready".
1683 GNUNET_MESH_notify_transmit_ready_cancel (struct GNUNET_MESH_TransmitHandle *th)
1685 struct GNUNET_MESH_Handle *mesh;
1687 mesh = th->tunnel->mesh;
1688 if (th->timeout_task != GNUNET_SCHEDULER_NO_TASK)
1689 GNUNET_SCHEDULER_cancel (th->timeout_task);
1690 GNUNET_CONTAINER_DLL_remove (mesh->th_head, mesh->th_tail, th);
1692 if ((NULL == mesh->th_head) && (NULL != mesh->th))
1694 /* queue empty, no point in asking for transmission */
1695 GNUNET_CLIENT_notify_transmit_ready_cancel (mesh->th);
1702 * Transition API for tunnel ctx management
1705 GNUNET_MESH_tunnel_set_data (struct GNUNET_MESH_Tunnel *tunnel, void *data)
1711 * Transition API for tunnel ctx management
1714 GNUNET_MESH_tunnel_get_data (struct GNUNET_MESH_Tunnel *tunnel)
1720 #if 0 /* keep Emacsens' auto-indent happy */