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
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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.
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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_new.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_new.h"
46 #include "mesh_protocol.h"
48 #define DEBUG GNUNET_YES
50 /******************************************************************************/
51 /************************ DATA STRUCTURES ****************************/
52 /******************************************************************************/
55 * Transmission queue to the service
57 struct GNUNET_MESH_TransmitHandle
63 struct GNUNET_MESH_TransmitHandle *next;
68 struct GNUNET_MESH_TransmitHandle *prev;
71 * Tunnel this message is sent over (may be NULL for control messages).
73 struct GNUNET_MESH_Tunnel *tunnel;
76 * Callback to obtain the message to transmit, or NULL if we
77 * got the message in 'data'. Notice that messages built
78 * by 'notify' need to be encapsulated with information about
81 GNUNET_CONNECTION_TransmitReadyNotify notify;
84 * Closure for 'notify'
89 * How long is this message valid. Once the timeout has been
90 * reached, the message must no longer be sent. If this
91 * is a message with a 'notify' callback set, the 'notify'
92 * function should be called with 'buf' NULL and size 0.
94 struct GNUNET_TIME_Absolute timeout;
97 * Task triggering a timeout, can be NO_TASK if the timeout is FOREVER.
99 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
102 * Priority of the message. The queue is sorted by priority,
103 * control messages have the maximum priority (UINT32_MAX).
108 * Target of the message, 0 for broadcast. This field
109 * is only valid if 'notify' is non-NULL.
111 GNUNET_PEER_Id target;
114 * Size of 'data' -- or the desired size of 'notify' if 'data' is NULL.
121 * Opaque handle to the service.
123 struct GNUNET_MESH_Handle
127 * Handle to the server connection, to send messages later
129 struct GNUNET_CLIENT_Connection *client;
132 * Set of handlers used for processing incoming messages in the tunnels
134 const struct GNUNET_MESH_MessageHandler *message_handlers;
137 * Set of applications that should be claimed to be offered at this node.
138 * Note that this is just informative, the appropiate handlers must be
139 * registered independently and the mapping is up to the developer of the
140 * client application.
142 const GNUNET_MESH_ApplicationType *applications;
145 * Double linked list of the tunnels this client is connected to.
147 struct GNUNET_MESH_Tunnel *tunnels_head;
148 struct GNUNET_MESH_Tunnel *tunnels_tail;
151 * Callback for inbound tunnel creation
153 GNUNET_MESH_InboundTunnelNotificationHandler *new_tunnel;
156 * Callback for inbound tunnel disconnection
158 GNUNET_MESH_TunnelEndHandler *cleaner;
161 * Handle to cancel pending transmissions in case of disconnection
163 struct GNUNET_CLIENT_TransmitHandle *th;
166 * Closure for all the handlers given by the client
171 * Messages to send to the service
173 struct GNUNET_MESH_TransmitHandle *th_head;
174 struct GNUNET_MESH_TransmitHandle *th_tail;
177 * tid of the next tunnel to create (to avoid reusing IDs often)
179 MESH_TunnelNumber next_tid;
180 unsigned int n_handlers;
181 unsigned int n_applications;
182 unsigned int max_queue_size;
185 * Have we started the task to receive messages from the service
186 * yet? We do this after we send the 'MESH_LOCAL_CONNECT' message.
191 * Number of packets queued
193 unsigned int npackets;
196 * Configuration given by the client, in case of reconnection
198 const struct GNUNET_CONFIGURATION_Handle *cfg;
201 * Time to the next reconnect in case one reconnect fails
203 struct GNUNET_TIME_Relative reconnect_time;
208 * Description of a peer
210 struct GNUNET_MESH_Peer
213 * ID of the peer in short form
218 * Tunnel this peer belongs to
220 struct GNUNET_MESH_Tunnel *t;
223 * Flag indicating whether service has informed about its connection
231 * Opaque handle to a tunnel.
233 struct GNUNET_MESH_Tunnel
239 struct GNUNET_MESH_Tunnel *next;
240 struct GNUNET_MESH_Tunnel *prev;
243 * Callback to execute when peers connect to the tunnel
245 GNUNET_MESH_PeerConnectHandler connect_handler;
248 * Callback to execute when peers disconnect from the tunnel
250 GNUNET_MESH_PeerDisconnectHandler disconnect_handler;
253 * Closure for the connect/disconnect handlers
258 * Handle to the mesh this tunnel belongs to
260 struct GNUNET_MESH_Handle *mesh;
263 * Local ID of the tunnel
265 MESH_TunnelNumber tid;
268 * Owner of the tunnel
270 GNUNET_PEER_Id owner;
273 * All peers added to the tunnel
275 struct GNUNET_MESH_Peer **peers;
278 * List of application types that have been requested for this tunnel
280 GNUNET_MESH_ApplicationType *apps;
283 * Any data the caller wants to put in here
288 * Number of peers added to the tunnel
293 * Number of packets queued in this tunnel
295 unsigned int npackets;
298 * Number of applications requested this tunnel
305 /******************************************************************************/
306 /*********************** AUXILIARY FUNCTIONS *************************/
307 /******************************************************************************/
310 * Get the tunnel handler for the tunnel specified by id from the given handle
311 * @param h Mesh handle
312 * @param tid ID of the wanted tunnel
313 * @return handle to the required tunnel or NULL if not found
315 static struct GNUNET_MESH_Tunnel *
316 retrieve_tunnel (struct GNUNET_MESH_Handle *h, MESH_TunnelNumber tid)
318 struct GNUNET_MESH_Tunnel *t;
332 * Create a new tunnel and insert it in the tunnel list of the mesh handle
333 * @param h Mesh handle
334 * @param tid desired tid of the tunnel, 0 to assign one automatically
335 * @return handle to the created tunnel
337 static struct GNUNET_MESH_Tunnel *
338 create_tunnel (struct GNUNET_MESH_Handle *h, MESH_TunnelNumber tid)
340 struct GNUNET_MESH_Tunnel *t;
342 t = GNUNET_malloc (sizeof (struct GNUNET_MESH_Tunnel));
343 GNUNET_CONTAINER_DLL_insert (h->tunnels_head, h->tunnels_tail, t);
347 t->tid = h->next_tid;
348 while (NULL != retrieve_tunnel (h, h->next_tid))
351 h->next_tid &= ~GNUNET_MESH_LOCAL_TUNNEL_ID_SERV;
352 h->next_tid |= GNUNET_MESH_LOCAL_TUNNEL_ID_CLI;
364 * Destroy the specified tunnel.
365 * - Destroys all peers, calling the disconnect callback on each if needed
366 * - Cancels all outgoing traffic for that tunnel, calling respective notifys
367 * - Calls cleaner if tunnel was inbound
368 * - Frees all memory used
369 * @param tid ID of the wanted tunnel
370 * @return handle to the required tunnel or NULL if not found
373 destroy_tunnel (struct GNUNET_MESH_Tunnel *t)
375 struct GNUNET_MESH_Handle *h;
376 struct GNUNET_PeerIdentity pi;
377 struct GNUNET_MESH_TransmitHandle *th;
378 struct GNUNET_MESH_TransmitHandle *aux;
393 GNUNET_CONTAINER_DLL_remove (h->th_head, h->th_tail, th);
394 if (NULL == h->th_head && NULL != h->th)
396 GNUNET_CLIENT_notify_transmit_ready_cancel (h->th);
399 if (NULL != th->notify)
400 th->notify (th->notify_cls, 0, NULL);
401 if (GNUNET_SCHEDULER_NO_TASK != th->timeout_task)
402 GNUNET_SCHEDULER_cancel (th->timeout_task);
411 GNUNET_CONTAINER_DLL_remove (h->tunnels_head, h->tunnels_tail, t);
412 for (i = 0; i < t->npeers; i++)
414 if (NULL != t->disconnect_handler && t->peers[i]->connected)
416 GNUNET_PEER_resolve (t->peers[i]->id, &pi);
417 t->disconnect_handler (t->cls, &pi);
419 GNUNET_PEER_change_rc (t->peers[i]->id, -1);
420 GNUNET_free (t->peers[i]);
423 GNUNET_free (t->peers);
424 if (NULL != h->cleaner && 0 != t->owner)
425 h->cleaner (h->cls, t, t->ctx);
427 GNUNET_PEER_change_rc (t->owner, -1);
428 if (0 != t->napps && t->apps)
429 GNUNET_free (t->apps);
436 * Get the peer descriptor for the peer with id from the given tunnel
437 * @param t Tunnel handle
438 * @param id Short form ID of the wanted peer
439 * @return handle to the requested peer or NULL if not found
441 static struct GNUNET_MESH_Peer *
442 retrieve_peer (struct GNUNET_MESH_Tunnel *t, GNUNET_PEER_Id id)
446 for (i = 0; i < t->npeers; i++)
447 if (t->peers[i]->id == id)
454 * Add a peer into a tunnel
455 * @param t Tunnel handle
456 * @param pi Full ID of the new peer
457 * @return handle to the newly created peer
459 static struct GNUNET_MESH_Peer *
460 add_peer_to_tunnel (struct GNUNET_MESH_Tunnel *t,
461 const struct GNUNET_PeerIdentity *pi)
463 struct GNUNET_MESH_Peer *p;
471 id = GNUNET_PEER_intern (pi);
473 p = GNUNET_malloc (sizeof (struct GNUNET_MESH_Peer));
476 GNUNET_array_append (t->peers, t->npeers, p);
482 * Remove a peer from a tunnel
483 * @param t Tunnel handle
484 * @param p Peer handle
487 remove_peer_from_tunnel (struct GNUNET_MESH_Peer *p)
491 for (i = 0; i < p->t->npeers; i++)
493 if (p->t->peers[i] == p)
496 if (i == p->t->npeers)
501 p->t->peers[i] = p->t->peers[p->t->npeers - 1];
502 GNUNET_array_grow (p->t->peers, p->t->npeers, p->t->npeers - 1);
507 * Notify client that the transmission has timed out
509 * @param tc task context
512 timeout_transmission (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
514 struct GNUNET_MESH_TransmitHandle *th = cls;
515 struct GNUNET_MESH_Handle *mesh;
517 mesh = th->tunnel->mesh;
518 GNUNET_CONTAINER_DLL_remove (mesh->th_head, mesh->th_tail, th);
519 if (th->notify != NULL)
520 th->notify (th->notify_cls, 0, NULL);
522 if ((NULL == mesh->th_head) && (NULL != mesh->th))
524 /* queue empty, no point in asking for transmission */
525 GNUNET_CLIENT_notify_transmit_ready_cancel (mesh->th);
532 * Add a transmit handle to the transmission queue by priority and set the
535 * @param h mesh handle with the queue head and tail
536 * @param q handle to the packet to be transmitted
539 add_to_queue (struct GNUNET_MESH_Handle *h,
540 struct GNUNET_MESH_TransmitHandle *th)
542 struct GNUNET_MESH_TransmitHandle *p;
545 while ((NULL != p) && (th->priority <= p->priority))
551 GNUNET_CONTAINER_DLL_insert_after (h->th_head, h->th_tail, p, th);
552 if (GNUNET_TIME_UNIT_FOREVER_ABS.abs_value == th->timeout.abs_value)
555 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_absolute_get_remaining
556 (th->timeout), &timeout_transmission, th);
561 * Auxiliary function to send an already constructed packet to the service.
562 * Takes care of creating a new queue element, copying the message and
563 * calling the tmt_rdy function if necessary.
564 * @param h mesh handle
565 * @param msg message to transmit
568 send_packet (struct GNUNET_MESH_Handle *h,
569 const struct GNUNET_MessageHeader *msg);
573 * Reconnect callback: tries to reconnect again after a failer previous
575 * @param cls closure (mesh handle)
576 * @param tc task context
579 reconnect_cbk (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
583 * Reconnect to the service, retransmit all infomation to try to restore the
586 * @param h handle to the mesh
588 * @return GNUNET_YES in case of sucess, GNUNET_NO otherwise (service down...)
591 reconnect (struct GNUNET_MESH_Handle *h)
593 struct GNUNET_MESH_Tunnel *t;
596 h->in_receive = GNUNET_NO;
600 GNUNET_CLIENT_notify_transmit_ready_cancel (h->th);
602 if (NULL != h->client)
604 GNUNET_CLIENT_disconnect (h->client, GNUNET_NO);
608 h->client = GNUNET_CLIENT_connect ("mesh", h->cfg);
609 if (h->client == NULL)
611 GNUNET_SCHEDULER_add_delayed (h->reconnect_time, &reconnect_cbk, h);
613 GNUNET_TIME_relative_min (GNUNET_TIME_UNIT_HOURS,
614 GNUNET_TIME_relative_multiply
615 (h->reconnect_time, 2));
621 h->reconnect_time = GNUNET_TIME_UNIT_MILLISECONDS;
623 /* Rebuild all tunnels */
624 for (t = h->tunnels_head; NULL != t; t = t->next)
626 struct GNUNET_MESH_TunnelMessage tmsg;
627 struct GNUNET_MESH_PeerControl pmsg;
629 tmsg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE);
630 tmsg.header.size = htons (sizeof (struct GNUNET_MESH_TunnelMessage));
631 tmsg.tunnel_id = htonl (t->tid);
632 send_packet (h, &tmsg.header);
634 pmsg.header.size = htons (sizeof (struct GNUNET_MESH_PeerControl));
635 pmsg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD);
636 pmsg.tunnel_id = htonl (t->tid);
638 /* Reconnect all peers */
639 for (i = 0; i < t->npeers; i++)
641 GNUNET_PEER_resolve (t->peers[i]->id, &pmsg.peer);
642 if (NULL != t->disconnect_handler && t->peers[i]->connected)
643 t->disconnect_handler (t->cls, &pmsg.peer);
644 /* If the tunnel was "by type", dont connect individual peers */
646 send_packet (t->mesh, &pmsg.header);
648 /* Reconnect all types, if any */
649 for (i = 0; i < t->napps; i++)
651 struct GNUNET_MESH_ConnectPeerByType msg;
653 msg.header.size = htons (sizeof (struct GNUNET_MESH_ConnectPeerByType));
654 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD_BY_TYPE);
655 msg.tunnel_id = htonl (t->tid);
656 msg.type = htonl (t->apps[i]);
657 send_packet (t->mesh, &msg.header);
664 * Reconnect callback: tries to reconnect again after a failer previous
666 * @param cls closure (mesh handle)
667 * @param tc task context
670 reconnect_cbk (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
672 struct GNUNET_MESH_Handle *h = cls;
674 if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN)
680 /******************************************************************************/
681 /*********************** RECEIVE HANDLERS ****************************/
682 /******************************************************************************/
685 * Process the new tunnel notification and add it to the tunnels in the handle
687 * @param h The mesh handle
688 * @param msg A message with the details of the new incoming tunnel
691 process_tunnel_created (struct GNUNET_MESH_Handle *h,
692 const struct GNUNET_MESH_TunnelNotification *msg)
694 struct GNUNET_MESH_Tunnel *t;
695 struct GNUNET_TRANSPORT_ATS_Information atsi;
696 MESH_TunnelNumber tid;
698 tid = ntohl (msg->tunnel_id);
699 if (tid <= GNUNET_MESH_LOCAL_TUNNEL_ID_CLI)
704 t = create_tunnel (h, tid);
705 t->owner = GNUNET_PEER_intern (&msg->peer);
707 t->peers = GNUNET_malloc (sizeof (struct GNUNET_MESH_Peer *));
708 t->peers[0] = GNUNET_malloc (sizeof (struct GNUNET_MESH_Peer));
710 t->peers[0]->connected = 1;
711 t->peers[0]->id = t->owner;
714 if (NULL != h->new_tunnel)
718 t->ctx = h->new_tunnel (h->cls, t, &msg->peer, &atsi);
720 GNUNET_CONTAINER_DLL_insert (h->tunnels_head, h->tunnels_tail, t);
726 * Process the tunnel destroy notification and free associated resources
728 * @param h The mesh handle
729 * @param msg A message with the details of the tunnel being destroyed
732 process_tunnel_destroy (struct GNUNET_MESH_Handle *h,
733 const struct GNUNET_MESH_TunnelMessage *msg)
735 struct GNUNET_MESH_Tunnel *t;
736 MESH_TunnelNumber tid;
738 tid = ntohl (msg->tunnel_id);
739 t = retrieve_tunnel (h, tid);
757 * Process the new peer event and notify the upper level of it
759 * @param h The mesh handle
760 * @param msg A message with the details of the peer event
763 process_peer_event (struct GNUNET_MESH_Handle *h,
764 const struct GNUNET_MESH_PeerControl *msg)
766 struct GNUNET_MESH_Tunnel *t;
767 struct GNUNET_MESH_Peer *p;
768 struct GNUNET_TRANSPORT_ATS_Information atsi;
772 size = ntohs (msg->header.size);
773 if (size != sizeof (struct GNUNET_MESH_PeerControl))
778 t = retrieve_tunnel (h, ntohl (msg->tunnel_id));
784 id = GNUNET_PEER_search (&msg->peer);
785 if ((p = retrieve_peer (t, id)) == NULL)
786 p = add_peer_to_tunnel (t, &msg->peer);
787 if (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD == msg->header.type)
789 if (NULL != t->connect_handler)
793 t->connect_handler (t->cls, &msg->peer, &atsi);
799 if (NULL != t->disconnect_handler && p->connected)
801 t->disconnect_handler (t->cls, &msg->peer);
803 remove_peer_from_tunnel (p);
810 * Process the incoming data packets
812 * @param h The mesh handle
813 * @param msh A message encapsulating the data
816 process_incoming_data (struct GNUNET_MESH_Handle *h,
817 const struct GNUNET_MessageHeader *message)
819 const struct GNUNET_MessageHeader *payload;
820 const struct GNUNET_MESH_MessageHandler *handler;
821 const struct GNUNET_PeerIdentity *peer;
822 struct GNUNET_MESH_Unicast *ucast;
823 struct GNUNET_MESH_Multicast *mcast;
824 struct GNUNET_MESH_ToOrigin *to_orig;
825 struct GNUNET_MESH_Tunnel *t;
830 type = ntohs (message->type);
833 case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
834 ucast = (struct GNUNET_MESH_Unicast *) message;
835 t = retrieve_tunnel (h, ntohl (ucast->tid));
836 payload = (struct GNUNET_MessageHeader *) &ucast[1];
839 case GNUNET_MESSAGE_TYPE_MESH_MULTICAST:
840 mcast = (struct GNUNET_MESH_Multicast *) message;
841 t = retrieve_tunnel (h, ntohl (mcast->tid));
842 payload = (struct GNUNET_MessageHeader *) &mcast[1];
845 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
846 to_orig = (struct GNUNET_MESH_ToOrigin *) message;
847 t = retrieve_tunnel (h, ntohl (to_orig->tid));
848 payload = (struct GNUNET_MessageHeader *) &to_orig[1];
849 peer = &to_orig->sender;
860 type = ntohs (payload->type);
861 for (i = 0; i < h->n_handlers; i++)
863 handler = &h->message_handlers[i];
864 if (handler->type == type)
866 struct GNUNET_TRANSPORT_ATS_Information atsi;
871 handler->callback (h->cls, t, &t->ctx, peer, payload, &atsi))
873 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
874 "MESH: callback caused disconnection\n");
875 GNUNET_MESH_disconnect (h);
880 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
881 "MESH: callback completed successfully\n");
891 * Function to process all messages received from the service
894 * @param msg message received, NULL on timeout or fatal error
897 msg_received (void *cls, const struct GNUNET_MessageHeader *msg)
899 struct GNUNET_MESH_Handle *h = cls;
901 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: received a message from MESH\n");
907 switch (ntohs (msg->type))
909 /* Notify of a new incoming tunnel */
910 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE:
911 process_tunnel_created (h, (struct GNUNET_MESH_TunnelNotification *) msg);
913 /* Notify of a tunnel disconnection */
914 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY:
915 process_tunnel_destroy (h, (struct GNUNET_MESH_TunnelMessage *) msg);
917 /* Notify of a new peer or a peer disconnect in the tunnel */
918 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD:
919 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_DEL:
920 process_peer_event (h, (struct GNUNET_MESH_PeerControl *) msg);
922 /* Notify of a new data packet in the tunnel */
923 case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
924 case GNUNET_MESSAGE_TYPE_MESH_MULTICAST:
925 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
926 process_incoming_data (h, msg);
928 /* We shouldn't get any other packages, log and ignore */
930 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
931 "MESH: unsolicited message form service (type %d)\n",
934 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: message processed\n");
935 GNUNET_CLIENT_receive (h->client, &msg_received, h,
936 GNUNET_TIME_UNIT_FOREVER_REL);
940 /******************************************************************************/
941 /************************ SEND FUNCTIONS ****************************/
942 /******************************************************************************/
945 * Function called to send a message to the service.
946 * "buf" will be NULL and "size" zero if the socket was closed for writing in
949 * @param cls closure, the mesh handle
950 * @param size number of bytes available in buf
951 * @param buf where the callee should write the connect message
952 * @return number of bytes written to buf
955 send_callback (void *cls, size_t size, void *buf)
957 struct GNUNET_MESH_Handle *h = cls;
958 struct GNUNET_MESH_TransmitHandle *th;
963 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: Send packet() Buffer %u\n", size);
965 if ((0 == size) || (NULL == buf))
971 while ((NULL != (th = h->th_head)) && (size >= th->size))
974 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: type: %u\n",
975 ntohs (((struct GNUNET_MessageHeader *) &th[1])->type));
976 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: size: %u\n",
977 ntohs (((struct GNUNET_MessageHeader *) &th[1])->size));
979 if (NULL != th->notify)
984 struct GNUNET_MESH_Multicast mc;
986 GNUNET_assert (size >= sizeof (mc) + th->size);
988 th->notify (th->notify_cls, size - sizeof (mc), &cbuf[sizeof (mc)]);
991 mc.header.size = htons (sizeof (mc) + th->size);
992 mc.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_MULTICAST);
993 mc.tid = htonl (th->tunnel->tid);
994 memset (&mc.oid, 0, sizeof (struct GNUNET_PeerIdentity));
995 memcpy (cbuf, &mc, sizeof (mc));
996 psize = th->size + sizeof (mc);
1002 struct GNUNET_MESH_Unicast uc;
1004 GNUNET_assert (size >= sizeof (uc) + th->size);
1006 th->notify (th->notify_cls, size - sizeof (uc), &cbuf[sizeof (uc)]);
1009 uc.header.size = htons (sizeof (uc) + th->size);
1010 uc.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_UNICAST);
1011 uc.tid = htonl (th->tunnel->tid);
1012 memset (&uc.oid, 0, sizeof (struct GNUNET_PeerIdentity));
1013 GNUNET_PEER_resolve (th->target, &uc.destination);
1014 memcpy (cbuf, &uc, sizeof (uc));
1015 psize = th->size + sizeof (uc);
1021 memcpy (cbuf, &th[1], th->size);
1024 if (th->timeout_task != GNUNET_SCHEDULER_NO_TASK)
1025 GNUNET_SCHEDULER_cancel (th->timeout_task);
1026 GNUNET_CONTAINER_DLL_remove (h->th_head, h->th_tail, th);
1032 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: total size: %u\n", tsize);
1033 if (NULL != (th = h->th_head))
1035 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: next size: %u\n", th->size);
1037 GNUNET_CLIENT_notify_transmit_ready (h->client, th->size,
1038 GNUNET_TIME_UNIT_FOREVER_REL,
1039 GNUNET_YES, &send_callback, h);
1041 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: Send packet() END\n");
1042 if (GNUNET_NO == h->in_receive)
1044 h->in_receive = GNUNET_YES;
1045 GNUNET_CLIENT_receive (h->client, &msg_received, h,
1046 GNUNET_TIME_UNIT_FOREVER_REL);
1053 * Auxiliary function to send an already constructed packet to the service.
1054 * Takes care of creating a new queue element, copying the message and
1055 * calling the tmt_rdy function if necessary.
1056 * @param h mesh handle
1057 * @param msg message to transmit
1060 send_packet (struct GNUNET_MESH_Handle *h,
1061 const struct GNUNET_MessageHeader *msg)
1063 struct GNUNET_MESH_TransmitHandle *th;
1066 msize = ntohs (msg->size);
1067 th = GNUNET_malloc (sizeof (struct GNUNET_MESH_TransmitHandle) + msize);
1068 th->priority = UINT32_MAX;
1069 th->timeout = GNUNET_TIME_UNIT_FOREVER_ABS;
1071 memcpy (&th[1], msg, msize);
1072 add_to_queue (h, th);
1076 GNUNET_CLIENT_notify_transmit_ready (h->client, msize,
1077 GNUNET_TIME_UNIT_FOREVER_REL,
1078 GNUNET_YES, &send_callback, h);
1082 /******************************************************************************/
1083 /********************** API CALL DEFINITIONS *************************/
1084 /******************************************************************************/
1087 * Connect to the mesh service.
1089 * @param cfg configuration to use
1090 * @param queue_size size of the data message queue, shared among all tunnels
1091 * (each tunnel is guaranteed to accept at least one message,
1092 * no matter what is the status of other tunnels)
1093 * @param cls closure for the various callbacks that follow
1094 * (including handlers in the handlers array)
1095 * @param new_tunnel function called when an *inbound* tunnel is created
1096 * @param cleaner function called when an *inbound* tunnel is destroyed
1097 * @param handlers callbacks for messages we care about, NULL-terminated
1098 * note that the mesh is allowed to drop notifications about
1099 * inbound messages if the client does not process them fast
1100 * enough (for this notification type, a bounded queue is used)
1101 * @param stypes list of the applications that this client claims to provide
1102 * @return handle to the mesh service NULL on error
1103 * (in this case, init is never called)
1105 struct GNUNET_MESH_Handle *
1106 GNUNET_MESH_connect (const struct GNUNET_CONFIGURATION_Handle *cfg,
1107 unsigned int queue_size, void *cls,
1108 GNUNET_MESH_InboundTunnelNotificationHandler new_tunnel,
1109 GNUNET_MESH_TunnelEndHandler cleaner,
1110 const struct GNUNET_MESH_MessageHandler *handlers,
1111 const GNUNET_MESH_ApplicationType *stypes)
1113 struct GNUNET_MESH_Handle *h;
1114 struct GNUNET_MESH_ClientConnect *msg;
1115 GNUNET_MESH_ApplicationType *apps;
1121 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: GNUNET_MESH_connect()\n");
1122 h = GNUNET_malloc (sizeof (struct GNUNET_MESH_Handle));
1124 h->max_queue_size = queue_size;
1125 h->new_tunnel = new_tunnel;
1126 h->cleaner = cleaner;
1127 h->client = GNUNET_CLIENT_connect ("mesh", cfg);
1128 if (h->client == NULL)
1135 h->message_handlers = handlers;
1136 h->applications = stypes;
1137 h->next_tid = GNUNET_MESH_LOCAL_TUNNEL_ID_CLI;
1138 h->reconnect_time = GNUNET_TIME_UNIT_MILLISECONDS;
1140 /* count handlers and apps, calculate size */
1141 for (h->n_handlers = 0; handlers[h->n_handlers].type; h->n_handlers++) ;
1142 for (h->n_applications = 0; stypes[h->n_applications]; h->n_applications++) ;
1143 size = sizeof (struct GNUNET_MESH_ClientConnect);
1144 size += h->n_handlers * sizeof (uint16_t);
1145 size += h->n_applications * sizeof (GNUNET_MESH_ApplicationType);
1150 /* build connection packet */
1151 msg = (struct GNUNET_MESH_ClientConnect *) buf;
1152 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT);
1153 msg->header.size = htons (size);
1154 types = (uint16_t *) & msg[1];
1155 for (ntypes = 0; ntypes < h->n_handlers; ntypes++)
1156 types[ntypes] = h->message_handlers[ntypes].type;
1157 apps = (GNUNET_MESH_ApplicationType *) &types[ntypes];
1158 for (napps = 0; napps < h->n_applications; napps++)
1159 apps[napps] = h->applications[napps];
1160 msg->applications = htons (napps);
1161 msg->types = htons (ntypes);
1163 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1164 "mesh: Sending %lu bytes long message %d types and %d apps\n",
1165 ntohs (msg->header.size), ntypes, napps);
1167 send_packet (h, &msg->header);
1169 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: GNUNET_MESH_connect() END\n");
1175 * Disconnect from the mesh service.
1177 * @param handle connection to mesh to disconnect
1180 GNUNET_MESH_disconnect (struct GNUNET_MESH_Handle *handle)
1182 struct GNUNET_MESH_Tunnel *t;
1183 struct GNUNET_MESH_Tunnel *aux;
1185 t = handle->tunnels_head;
1192 if (NULL != handle->th)
1194 GNUNET_CLIENT_notify_transmit_ready_cancel (handle->th);
1196 if (NULL != handle->client)
1198 GNUNET_CLIENT_disconnect (handle->client, GNUNET_NO);
1200 GNUNET_free (handle);
1205 * Create a new tunnel (we're initiator and will be allowed to add/remove peers
1206 * and to broadcast).
1208 * @param h mesh handle
1209 * @param tunnel_ctx client's tunnel context to associate with the tunnel
1210 * @param connect_handler function to call when peers are actually connected
1211 * @param disconnect_handler function to call when peers are disconnected
1212 * @param handler_cls closure for connect/disconnect handlers
1214 struct GNUNET_MESH_Tunnel *
1215 GNUNET_MESH_tunnel_create (struct GNUNET_MESH_Handle *h, void *tunnel_ctx,
1216 GNUNET_MESH_PeerConnectHandler connect_handler,
1217 GNUNET_MESH_PeerDisconnectHandler disconnect_handler,
1220 struct GNUNET_MESH_Tunnel *t;
1221 struct GNUNET_MESH_TunnelMessage msg;
1223 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: Creating new tunnel\n");
1224 t = create_tunnel (h, 0);
1225 t->connect_handler = connect_handler;
1226 t->disconnect_handler = disconnect_handler;
1227 t->cls = handler_cls;
1228 t->ctx = tunnel_ctx;
1229 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE);
1230 msg.header.size = htons (sizeof (struct GNUNET_MESH_TunnelMessage));
1231 msg.tunnel_id = htonl (t->tid);
1232 send_packet (h, &msg.header);
1238 * Destroy an existing tunnel.
1240 * @param tun tunnel handle
1243 GNUNET_MESH_tunnel_destroy (struct GNUNET_MESH_Tunnel *tunnel)
1245 struct GNUNET_MESH_Handle *h;
1246 struct GNUNET_MESH_TunnelMessage msg;
1248 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: Destroying tunnel\n");
1251 if (0 != tunnel->owner)
1252 GNUNET_PEER_change_rc (tunnel->owner, -1);
1254 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY);
1255 msg.header.size = htons (sizeof (struct GNUNET_MESH_TunnelMessage));
1256 msg.tunnel_id = htonl (tunnel->tid);
1257 destroy_tunnel (tunnel);
1258 send_packet (h, &msg.header);
1263 * Request that a peer should be added to the tunnel. The existing
1264 * connect handler will be called ONCE with either success or failure.
1265 * This function should NOT be called again with the same peer before the
1266 * connect handler is called.
1268 * @param tunnel handle to existing tunnel
1269 * @param timeout how long to try to establish a connection
1270 * @param peer peer to add
1273 GNUNET_MESH_peer_request_connect_add (struct GNUNET_MESH_Tunnel *tunnel,
1274 const struct GNUNET_PeerIdentity *peer)
1276 struct GNUNET_MESH_PeerControl msg;
1277 GNUNET_PEER_Id peer_id;
1280 peer_id = GNUNET_PEER_intern (peer);
1281 for (i = 0; i < tunnel->npeers; i++)
1283 if (tunnel->peers[i]->id == peer_id)
1285 GNUNET_PEER_change_rc (peer_id, -1);
1290 if (NULL == add_peer_to_tunnel (tunnel, peer))
1293 msg.header.size = htons (sizeof (struct GNUNET_MESH_PeerControl));
1294 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD);
1295 msg.tunnel_id = htonl (tunnel->tid);
1297 send_packet (tunnel->mesh, &msg.header);
1304 * Request that a peer should be removed from the tunnel. The existing
1305 * disconnect handler will be called ONCE if we were connected.
1307 * @param tunnel handle to existing tunnel
1308 * @param peer peer to remove
1311 GNUNET_MESH_peer_request_connect_del (struct GNUNET_MESH_Tunnel *tunnel,
1312 const struct GNUNET_PeerIdentity *peer)
1314 struct GNUNET_MESH_PeerControl msg;
1315 GNUNET_PEER_Id peer_id;
1318 peer_id = GNUNET_PEER_search (peer);
1324 for (i = 0; i < tunnel->npeers; i++)
1325 if (tunnel->peers[i]->id == peer_id)
1327 if (i == tunnel->npeers)
1332 if (NULL != tunnel->disconnect_handler && tunnel->peers[i]->connected == 1)
1333 tunnel->disconnect_handler (tunnel->cls, peer);
1334 GNUNET_PEER_change_rc (peer_id, -1);
1335 GNUNET_free (tunnel->peers[i]);
1336 tunnel->peers[i] = tunnel->peers[tunnel->npeers - 1];
1337 GNUNET_array_grow (tunnel->peers, tunnel->npeers, tunnel->npeers - 1);
1339 msg.header.size = htons (sizeof (struct GNUNET_MESH_PeerControl));
1340 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_DEL);
1341 msg.tunnel_id = htonl (tunnel->tid);
1342 memcpy (&msg.peer, peer, sizeof (struct GNUNET_PeerIdentity));
1343 send_packet (tunnel->mesh, &msg.header);
1348 * Request that the mesh should try to connect to a peer supporting the given
1351 * @param tunnel handle to existing tunnel
1352 * @param app_type application type that must be supported by the peer (MESH
1353 * should discover peer in proximity handling this type)
1356 GNUNET_MESH_peer_request_connect_by_type (struct GNUNET_MESH_Tunnel *tunnel,
1357 GNUNET_MESH_ApplicationType app_type)
1359 struct GNUNET_MESH_ConnectPeerByType msg;
1361 GNUNET_array_append (tunnel->apps, tunnel->napps, app_type);
1363 msg.header.size = htons (sizeof (struct GNUNET_MESH_ConnectPeerByType));
1364 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD_BY_TYPE);
1365 msg.tunnel_id = htonl (tunnel->tid);
1366 msg.type = htonl (app_type);
1367 send_packet (tunnel->mesh, &msg.header);
1372 * Ask the mesh to call "notify" once it is ready to transmit the
1373 * given number of bytes to the specified "target". If we are not yet
1374 * connected to the specified peer, a call to this function will cause
1375 * us to try to establish a connection.
1377 * @param tunnel tunnel to use for transmission
1378 * @param cork is corking allowed for this transmission?
1379 * @param priority how important is the message?
1380 * @param maxdelay how long can the message wait?
1381 * @param target destination for the message,
1382 * NULL for multicast to all tunnel targets
1383 * @param notify_size how many bytes of buffer space does notify want?
1384 * @param notify function to call when buffer space is available;
1385 * will be called with NULL on timeout or if the overall queue
1386 * for this peer is larger than queue_size and this is currently
1387 * the message with the lowest priority
1388 * @param notify_cls closure for notify
1389 * @return non-NULL if the notify callback was queued,
1390 * NULL if we can not even queue the request (insufficient
1391 * memory); if NULL is returned, "notify" will NOT be called.
1393 struct GNUNET_MESH_TransmitHandle *
1394 GNUNET_MESH_notify_transmit_ready (struct GNUNET_MESH_Tunnel *tunnel, int cork,
1396 struct GNUNET_TIME_Relative maxdelay,
1397 const struct GNUNET_PeerIdentity *target,
1399 GNUNET_CONNECTION_TransmitReadyNotify notify,
1402 struct GNUNET_MESH_TransmitHandle *th;
1403 struct GNUNET_MESH_TransmitHandle *least_priority_th;
1404 uint32_t least_priority;
1407 GNUNET_assert (NULL != notify);
1408 if (tunnel->mesh->npackets >= tunnel->mesh->max_queue_size &&
1409 tunnel->npackets > 0)
1414 th = tunnel->mesh->th_tail;
1415 least_priority = priority;
1416 least_priority_th = NULL;
1419 if (th->priority < least_priority && th->tunnel->npackets > 1)
1421 least_priority_th = th;
1422 least_priority = th->priority;
1426 if (NULL == least_priority_th)
1428 /* Can't be a control message */
1429 GNUNET_assert (NULL != least_priority_th->notify);
1430 least_priority_th->notify (notify_cls, 0, NULL);
1431 least_priority_th->tunnel->npackets--;
1432 tunnel->mesh->npackets--;
1433 GNUNET_CONTAINER_DLL_remove (tunnel->mesh->th_head, tunnel->mesh->th_tail,
1435 if (GNUNET_SCHEDULER_NO_TASK != least_priority_th->timeout_task)
1436 GNUNET_SCHEDULER_cancel (least_priority_th->timeout_task);
1437 GNUNET_free (least_priority_th);
1440 tunnel->mesh->npackets++;
1441 th = GNUNET_malloc (sizeof (struct GNUNET_MESH_TransmitHandle));
1442 th->tunnel = tunnel;
1443 th->priority = priority;
1444 th->timeout = GNUNET_TIME_relative_to_absolute (maxdelay);
1445 th->target = GNUNET_PEER_intern (target);
1447 overhead = sizeof (struct GNUNET_MESH_Multicast);
1449 overhead = sizeof (struct GNUNET_MESH_Unicast);
1450 th->size = notify_size + overhead;
1451 th->notify = notify;
1452 th->notify_cls = notify_cls;
1453 add_to_queue (tunnel->mesh, th);
1459 * Cancel the specified transmission-ready notification.
1461 * @param th handle that was returned by "notify_transmit_ready".
1464 GNUNET_MESH_notify_transmit_ready_cancel (struct GNUNET_MESH_TransmitHandle *th)
1466 struct GNUNET_MESH_Handle *mesh;
1468 mesh = th->tunnel->mesh;
1469 if (th->timeout_task != GNUNET_SCHEDULER_NO_TASK)
1470 GNUNET_SCHEDULER_cancel (th->timeout_task);
1471 GNUNET_CONTAINER_DLL_remove (mesh->th_head, mesh->th_tail, th);
1473 if ((NULL == mesh->th_head) && (NULL != mesh->th))
1475 /* queue empty, no point in asking for transmission */
1476 GNUNET_CLIENT_notify_transmit_ready_cancel (mesh->th);
1482 #if 0 /* keep Emacsens' auto-indent happy */