3 This file is part of GNUnet.
4 (C) 2011 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
9 GNUnet is distributed in the hope that it will be useful, but
10 WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 General Public License for more details.
13 You should have received a copy of the GNU General Public License
14 along with GNUnet; see the file COPYING. If not, write to the
15 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 Boston, MA 02111-1307, USA.
20 * @file mesh/mesh_api_new.c
21 * @brief mesh api: client implementation of mesh service
22 * @author Bartlomiej Polot
25 * - handle reconnect (service crash/disconnect) properly
26 * - callbacks to client missing on certain events
27 * - processing messages from service is incomplete
32 * - AUXILIARY FUNCTIONS
35 * - API CALL DEFINITIONS
40 #if 0 /* keep Emacsens' auto-indent happy */
46 #include "gnunet_common.h"
47 #include "gnunet_client_lib.h"
48 #include "gnunet_util_lib.h"
49 #include "gnunet_peer_lib.h"
50 #include "gnunet_mesh_service_new.h"
52 #include "mesh_protocol.h"
55 /******************************************************************************/
56 /************************ DATA STRUCTURES ****************************/
57 /******************************************************************************/
60 * Transmission queue to the service
62 struct GNUNET_MESH_TransmitHandle
68 struct GNUNET_MESH_TransmitHandle *next;
73 struct GNUNET_MESH_TransmitHandle *prev;
76 * Tunnel this message is sent over (may be NULL for control messages).
78 struct GNUNET_MESH_Tunnel *tunnel;
81 * Data itself, currently points to the end of this struct if
82 * we have a message already, NULL if the message is to be
83 * obtained from the callback.
85 const struct GNUNET_MessageHeader *data;
88 * Callback to obtain the message to transmit, or NULL if we
89 * got the message in 'data'. Notice that messages built
90 * by 'notify' need to be encapsulated with information about
93 GNUNET_CONNECTION_TransmitReadyNotify notify;
96 * Closure for 'notify'
101 * How long is this message valid. Once the timeout has been
102 * reached, the message must no longer be sent. If this
103 * is a message with a 'notify' callback set, the 'notify'
104 * function should be called with 'buf' NULL and size 0.
106 struct GNUNET_TIME_Absolute timeout;
109 * Task triggering a timeout, can be NO_TASK if the timeout is FOREVER.
111 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
114 * Priority of the message. The queue is sorted by priority,
115 * control messages have the maximum priority (UINT32_MAX).
120 * Target of the message, 0 for broadcast. This field
121 * is only valid if 'notify' is non-NULL.
123 GNUNET_PEER_Id target;
126 * Size of 'data' -- or the desired size of 'notify' if 'data' is NULL.
133 * Opaque handle to the service.
135 struct GNUNET_MESH_Handle
139 * Handle to the server connection, to send messages later
141 struct GNUNET_CLIENT_Connection *client;
144 * Set of handlers used for processing incoming messages in the tunnels
146 const struct GNUNET_MESH_MessageHandler *message_handlers;
149 * Set of applications that should be claimed to be offered at this node.
150 * Note that this is just informative, the appropiate handlers must be
151 * registered independently and the mapping is up to the developer of the
152 * client application.
154 const GNUNET_MESH_ApplicationType *applications;
157 * Double linked list of the tunnels this client is connected to.
159 struct GNUNET_MESH_Tunnel *tunnels_head;
160 struct GNUNET_MESH_Tunnel *tunnels_tail;
163 * Callback for tunnel disconnection
165 GNUNET_MESH_TunnelEndHandler *cleaner;
168 * Handle to cancel pending transmissions in case of disconnection
170 struct GNUNET_CLIENT_TransmitHandle *th;
173 * Closure for all the handlers given by the client
178 * Messages to send to the service
180 struct GNUNET_MESH_TransmitHandle *th_head;
181 struct GNUNET_MESH_TransmitHandle *th_tail;
184 * tid of the next tunnel to create (to avoid reusing IDs often)
186 MESH_TunnelNumber next_tid;
187 unsigned int n_handlers;
188 unsigned int n_applications;
189 unsigned int max_queue_size;
192 * Have we started the task to receive messages from the service
193 * yet? We do this after we send the 'MESH_LOCAL_CONNECT' message.
198 * Number of packets queued
200 unsigned int npackets;
205 * Description of a peer
207 struct GNUNET_MESH_Peer
210 * ID of the peer in short form
215 * Tunnel this peer belongs to
217 struct GNUNET_MESH_Tunnel *t;
220 * Flag indicating whether service has informed about its connection
228 * Opaque handle to a tunnel.
230 struct GNUNET_MESH_Tunnel
236 struct GNUNET_MESH_Tunnel *next;
237 struct GNUNET_MESH_Tunnel *prev;
240 * Callback to execute when peers connect to the tunnel
242 GNUNET_MESH_TunnelConnectHandler connect_handler;
245 * Callback to execute when peers disconnect to the tunnel
247 GNUNET_MESH_TunnelDisconnectHandler disconnect_handler;
250 * All peers added to the tunnel
252 struct GNUNET_MESH_Peer **peers;
255 * Closure for the connect/disconnect handlers
260 * Handle to the mesh this tunnel belongs to
262 struct GNUNET_MESH_Handle *mesh;
265 * Local ID of the tunnel
267 MESH_TunnelNumber tid;
270 * Owner of the tunnel
272 GNUNET_PEER_Id owner;
275 * Number of peers added to the tunnel
280 * Number of packets queued in this tunnel
282 unsigned int npackets;
286 /******************************************************************************/
287 /*********************** AUXILIARY FUNCTIONS *************************/
288 /******************************************************************************/
291 * Get the tunnel handler for the tunnel specified by id from the given handle
292 * @param h Mesh handle
293 * @param tid ID of the wanted tunnel
294 * @return handle to the required tunnel or NULL if not found
296 static struct GNUNET_MESH_Tunnel *
297 retrieve_tunnel (struct GNUNET_MESH_Handle *h, MESH_TunnelNumber tid)
299 struct GNUNET_MESH_Tunnel *t;
313 * Get the peer descriptor for the peer with id from the given tunnel
314 * @param t Tunnel handle
315 * @param id Short form ID of the wanted peer
316 * @return handle to the requested peer or NULL if not found
318 static struct GNUNET_MESH_Peer *
319 retrieve_peer (struct GNUNET_MESH_Tunnel *t, GNUNET_PEER_Id id)
323 for (i = 0; i < t->npeers; i++)
324 if (t->peers[i]->id == id)
331 * Add a peer into a tunnel
332 * @param t Tunnel handle
333 * @param pi Full ID of the new peer
334 * @return handle to the newly created peer
336 static struct GNUNET_MESH_Peer *
337 add_peer_to_tunnel (struct GNUNET_MESH_Tunnel *t,
338 const struct GNUNET_PeerIdentity *pi)
340 struct GNUNET_MESH_Peer *p;
343 id = GNUNET_PEER_intern (pi);
345 p = GNUNET_malloc (sizeof (struct GNUNET_MESH_Peer));
348 GNUNET_array_append (t->peers, t->npeers, p);
354 * Remove a peer from a tunnel
355 * @param t Tunnel handle
356 * @param p Peer handle
359 remove_peer_from_tunnel (struct GNUNET_MESH_Peer *p)
363 for (i = 0; i < p->t->npeers; i++)
365 if (p->t->peers[i] == p)
368 if (i == p->t->npeers)
373 p->t->peers[i] = p->t->peers[p->t->npeers - 1];
374 GNUNET_array_grow (p->t->peers, p->t->npeers, p->t->npeers - 1);
379 * Notify client that the transmission has timed out
381 * @param tc task context
384 timeout_transmission (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
386 struct GNUNET_MESH_TransmitHandle *th = cls;
387 struct GNUNET_MESH_Handle *mesh;
389 mesh = th->tunnel->mesh;
390 GNUNET_CONTAINER_DLL_remove (mesh->th_head, mesh->th_tail, th);
391 if (th->notify != NULL)
392 th->notify (th->notify_cls, 0, NULL);
394 if ((NULL == mesh->th_head) && (NULL != mesh->th))
396 /* queue empty, no point in asking for transmission */
397 GNUNET_CLIENT_notify_transmit_ready_cancel (mesh->th);
404 * Add a transmit handle to the transmission queue by priority and set the
407 * @param h mesh handle with the queue head and tail
408 * @param q handle to the packet to be transmitted
411 add_to_queue (struct GNUNET_MESH_Handle *h,
412 struct GNUNET_MESH_TransmitHandle *th)
414 struct GNUNET_MESH_TransmitHandle *p;
417 while ((NULL != p) && (th->priority <= p->priority))
423 GNUNET_CONTAINER_DLL_insert_after (h->th_head, h->th_tail, p, th);
424 if (GNUNET_TIME_UNIT_FOREVER_ABS.abs_value == th->timeout.abs_value)
427 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_absolute_get_remaining
428 (th->timeout), &timeout_transmission, th);
432 /******************************************************************************/
433 /*********************** RECEIVE HANDLERS ****************************/
434 /******************************************************************************/
437 * Process the new tunnel notification and add it to the tunnels in the handle
439 * @param h The mesh handle
440 * @param msg A message with the details of the new incoming tunnel
443 process_tunnel_create (struct GNUNET_MESH_Handle *h,
444 const struct GNUNET_MESH_TunnelMessage *msg)
446 struct GNUNET_MESH_Tunnel *t;
447 MESH_TunnelNumber tid;
449 tid = ntohl (msg->tunnel_id);
450 if (tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_MARK)
453 return; //FIXME abort? reconnect?
455 t = GNUNET_malloc (sizeof (struct GNUNET_MESH_Tunnel));
464 * Process the new peer event and notify the upper level of it
466 * @param h The mesh handle
467 * @param msg A message with the details of the peer event
470 process_peer_event (struct GNUNET_MESH_Handle *h,
471 const struct GNUNET_MESH_PeerControl *msg)
473 struct GNUNET_MESH_Tunnel *t;
474 struct GNUNET_MESH_Peer *p;
475 struct GNUNET_TRANSPORT_ATS_Information atsi;
479 size = ntohs (msg->header.size);
480 if (size != sizeof (struct GNUNET_MESH_PeerControl))
485 t = retrieve_tunnel (h, ntohl (msg->tunnel_id));
491 id = GNUNET_PEER_search (&msg->peer);
492 if ((p = retrieve_peer (t, id)) == NULL)
493 p = add_peer_to_tunnel (t, &msg->peer);
496 if (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_CONNECTED == msg->header.type)
498 if (NULL != t->connect_handler)
500 t->connect_handler (t->cls, &msg->peer, &atsi);
506 if (NULL != t->disconnect_handler && p->connected)
508 t->disconnect_handler (t->cls, &msg->peer);
510 remove_peer_from_tunnel (p);
517 * Process the incoming data packets
519 * @param h The mesh handle
520 * @param msh A message encapsulating the data
523 process_incoming_data (struct GNUNET_MESH_Handle *h,
524 const struct GNUNET_MessageHeader *message)
526 const struct GNUNET_MessageHeader *payload;
527 const struct GNUNET_MESH_MessageHandler *handler;
528 const struct GNUNET_PeerIdentity *peer;
529 struct GNUNET_MESH_Unicast *ucast;
530 struct GNUNET_MESH_Multicast *mcast;
531 struct GNUNET_MESH_ToOrigin *to_orig;
532 struct GNUNET_MESH_Tunnel *t;
536 type = ntohs (message->type);
539 case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
540 ucast = (struct GNUNET_MESH_Unicast *) message;
541 t = retrieve_tunnel (h, ntohl (ucast->tid));
542 payload = (struct GNUNET_MessageHeader *) &ucast[1];
545 case GNUNET_MESSAGE_TYPE_MESH_MULTICAST:
546 mcast = (struct GNUNET_MESH_Multicast *) message;
547 t = retrieve_tunnel (h, ntohl (mcast->tid));
548 payload = (struct GNUNET_MessageHeader *) &mcast[1];
551 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
552 to_orig = (struct GNUNET_MESH_ToOrigin *) message;
553 t = retrieve_tunnel (h, ntohl (to_orig->tid));
554 payload = (struct GNUNET_MessageHeader *) &to_orig[1];
555 peer = &to_orig->sender;
566 for (i = 0; i < h->n_handlers; i++)
568 handler = &h->message_handlers[i];
569 if (handler->type == type)
571 if (GNUNET_OK == handler->callback (h->cls, t, NULL, /* FIXME ctx */
572 peer, payload, NULL))
574 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
575 "MESH: callback completed successfully\n");
579 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
580 "MESH: callback caused disconnection\n");
581 GNUNET_MESH_disconnect (h);
589 * Function to process all messages received from the service
592 * @param msg message received, NULL on timeout or fatal error
595 msg_received (void *cls, const struct GNUNET_MessageHeader *msg)
597 struct GNUNET_MESH_Handle *h = cls;
599 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: received a message from MESH\n");
603 h->in_receive = GNUNET_NO;
604 // rather: do_reconnect () -- and set 'in_receive' to NO there...
605 // FIXME: service disconnect, handle!
608 switch (ntohs (msg->type))
610 /* Notify of a new incoming tunnel */
611 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE:
612 process_tunnel_create (h, (struct GNUNET_MESH_TunnelMessage *) msg);
614 /* Notify of a new peer or a peer disconnect in the tunnel */
615 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_CONNECTED:
616 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_DISCONNECTED:
617 process_peer_event (h, (struct GNUNET_MESH_PeerControl *) msg);
619 /* Notify of a new data packet in the tunnel */
620 case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
621 case GNUNET_MESSAGE_TYPE_MESH_MULTICAST:
622 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
623 process_incoming_data (h, msg);
625 /* We shouldn't get any other packages, log and ignore */
627 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
628 "MESH: unsolicited message form service (type %d)\n",
631 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: message processed\n");
632 GNUNET_CLIENT_receive (h->client, &msg_received, h,
633 GNUNET_TIME_UNIT_FOREVER_REL);
637 /******************************************************************************/
638 /************************ SEND FUNCTIONS ****************************/
639 /******************************************************************************/
642 * Function called to send a message to the service.
643 * "buf" will be NULL and "size" zero if the socket was closed for writing in
646 * @param cls closure, the mesh handle
647 * @param size number of bytes available in buf
648 * @param buf where the callee should write the connect message
649 * @return number of bytes written to buf
652 send_callback (void *cls, size_t size, void *buf)
654 struct GNUNET_MESH_Handle *h = cls;
655 struct GNUNET_MESH_TransmitHandle *th;
660 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: Send packet() Buffer %u\n", size);
662 if ((0 == size) || (NULL == buf))
664 // FIXME: disconnect, reconnect, retry?
669 while ((NULL != (th = h->th_head)) && (size >= th->size))
671 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: type: %u\n",
672 ntohs (th->data->type));
673 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: size: %u\n",
674 ntohs (th->data->size));
675 if (NULL == th->data)
677 GNUNET_assert (NULL != th->notify);
681 struct GNUNET_MESH_Multicast mc;
683 GNUNET_assert (size >= sizeof (mc) + th->size);
685 th->notify (th->notify_cls, size - sizeof (mc), &cbuf[sizeof (mc)]);
688 mc.header.size = htons (sizeof (mc) + th->size);
689 mc.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_MULTICAST);
690 mc.tid = htonl (th->tunnel->tid);
691 memset (&mc.oid, 0, sizeof (struct GNUNET_PeerIdentity)); /* myself */
692 memcpy (cbuf, &mc, sizeof (mc));
693 psize = th->size + sizeof (mc);
699 struct GNUNET_MESH_Unicast uc;
701 GNUNET_assert (size >= sizeof (uc) + th->size);
703 th->notify (th->notify_cls, size - sizeof (uc), &cbuf[sizeof (uc)]);
706 uc.header.size = htons (sizeof (uc) + th->size);
707 uc.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_UNICAST);
708 uc.tid = htonl (th->tunnel->tid);
709 memset (&uc.oid, 0, sizeof (struct GNUNET_PeerIdentity)); /* myself */
710 GNUNET_PEER_resolve (th->target, &uc.destination);
711 memcpy (cbuf, &uc, sizeof (uc));
712 psize = th->size + sizeof (uc);
718 memcpy (cbuf, th->data, th->size);
721 if (th->timeout_task != GNUNET_SCHEDULER_NO_TASK)
722 GNUNET_SCHEDULER_cancel (th->timeout_task);
723 GNUNET_CONTAINER_DLL_remove (h->th_head, h->th_tail, th);
729 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: total size: %u\n", tsize);
730 if (NULL != (th = h->th_head))
732 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: next size: %u\n", th->size);
734 GNUNET_CLIENT_notify_transmit_ready (h->client, th->size,
735 GNUNET_TIME_UNIT_FOREVER_REL,
736 GNUNET_YES, &send_callback, h);
738 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: Send packet() END\n");
739 if (GNUNET_NO == h->in_receive)
741 h->in_receive = GNUNET_YES;
742 GNUNET_CLIENT_receive (h->client, &msg_received, h,
743 GNUNET_TIME_UNIT_FOREVER_REL);
750 * Auxiliary function to send an already constructed packet to the service.
751 * Takes care of creating a new queue element, copying the message and
752 * calling the tmt_rdy function if necessary.
753 * @param h mesh handle
754 * @param msg message to transmit
757 send_packet (struct GNUNET_MESH_Handle *h,
758 const struct GNUNET_MessageHeader *msg)
760 struct GNUNET_MESH_TransmitHandle *th;
763 msize = ntohs (msg->size);
764 th = GNUNET_malloc (sizeof (struct GNUNET_MESH_TransmitHandle) + msize);
765 th->priority = UINT32_MAX;
766 th->timeout = GNUNET_TIME_UNIT_FOREVER_ABS;
768 th->data = (void *) &th[1];
769 memcpy (&th[1], msg, msize);
770 add_to_queue (h, th);
774 GNUNET_CLIENT_notify_transmit_ready (h->client, msize,
775 GNUNET_TIME_UNIT_FOREVER_REL,
776 GNUNET_YES, &send_callback, h);
780 /******************************************************************************/
781 /********************** API CALL DEFINITIONS *************************/
782 /******************************************************************************/
785 * Connect to the mesh service.
787 * @param cfg configuration to use
788 * @param cls closure for the various callbacks that follow
789 * (including handlers in the handlers array)
790 * @param queue_size size of the data message queue, shared among all tunnels
791 * (each tunnel is guaranteed to accept at least one message,
792 * no matter what is the status of other tunnels)
793 * @param cleaner function called when an *inbound* tunnel is destroyed
794 * @param handlers callbacks for messages we care about, NULL-terminated
795 * note that the mesh is allowed to drop notifications about
796 * inbound messages if the client does not process them fast
797 * enough (for this notification type, a bounded queue is used)
798 * @param stypes Application Types the client claims to offer
799 * @return handle to the mesh service
800 * NULL on error (in this case, init is never called)
802 struct GNUNET_MESH_Handle *
803 GNUNET_MESH_connect (const struct GNUNET_CONFIGURATION_Handle *cfg,
804 unsigned int queue_size, void *cls,
805 GNUNET_MESH_TunnelEndHandler cleaner,
806 const struct GNUNET_MESH_MessageHandler *handlers,
807 const GNUNET_MESH_ApplicationType *stypes)
809 struct GNUNET_MESH_Handle *h;
810 struct GNUNET_MESH_ClientConnect *msg;
811 GNUNET_MESH_ApplicationType *apps;
817 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: GNUNET_MESH_connect()\n");
818 h = GNUNET_malloc (sizeof (struct GNUNET_MESH_Handle));
819 h->max_queue_size = queue_size;
820 h->cleaner = cleaner;
821 h->client = GNUNET_CLIENT_connect ("mesh", cfg);
822 if (h->client == NULL)
829 h->message_handlers = handlers;
830 h->applications = stypes;
831 h->next_tid = GNUNET_MESH_LOCAL_TUNNEL_ID_MARK;
833 /* count handlers and apps, calculate size */
834 for (h->n_handlers = 0; handlers[h->n_handlers].type; h->n_handlers++) ;
835 for (h->n_applications = 0; stypes[h->n_applications]; h->n_applications++) ;
836 size = sizeof (struct GNUNET_MESH_ClientConnect);
837 size += h->n_handlers * sizeof (uint16_t);
838 size += h->n_applications * sizeof (GNUNET_MESH_ApplicationType);
843 /* build connection packet */
844 msg = (struct GNUNET_MESH_ClientConnect *) buf;
845 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT);
846 msg->header.size = htons (size);
847 types = (uint16_t *) & msg[1];
848 for (ntypes = 0; ntypes < h->n_handlers; ntypes++)
849 types[ntypes] = h->message_handlers[ntypes].type;
850 apps = (GNUNET_MESH_ApplicationType *) &types[ntypes];
851 for (napps = 0; napps < h->n_applications; napps++)
852 apps[napps] = h->applications[napps];
853 msg->applications = htons (napps);
854 msg->types = htons (ntypes);
855 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
856 "mesh: Sending %lu bytes long message %d types and %d apps\n",
857 ntohs (msg->header.size), ntypes, napps);
858 send_packet (h, &msg->header);
860 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: GNUNET_MESH_connect() END\n");
866 * Disconnect from the mesh service.
868 * @param handle connection to mesh to disconnect
871 GNUNET_MESH_disconnect (struct GNUNET_MESH_Handle *handle)
873 if (NULL != handle->th)
875 GNUNET_CLIENT_notify_transmit_ready_cancel (handle->th);
877 if (NULL != handle->client)
879 GNUNET_CLIENT_disconnect (handle->client, GNUNET_NO);
881 GNUNET_free (handle);
886 * Create a new tunnel (we're initiator and will be allowed to add/remove peers
889 * @param h mesh handle
890 * @param connect_handler function to call when peers are actually connected
891 * @param disconnect_handler function to call when peers are disconnected
892 * @param handler_cls closure for connect/disconnect handlers
894 struct GNUNET_MESH_Tunnel *
895 GNUNET_MESH_tunnel_create (struct GNUNET_MESH_Handle *h,
896 GNUNET_MESH_TunnelConnectHandler connect_handler,
897 GNUNET_MESH_TunnelDisconnectHandler
898 disconnect_handler, void *handler_cls)
900 struct GNUNET_MESH_Tunnel *t;
901 struct GNUNET_MESH_TunnelMessage msg;
903 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: Creating new tunnel\n");
904 t = GNUNET_malloc (sizeof (struct GNUNET_MESH_Tunnel));
905 t->connect_handler = connect_handler;
906 t->disconnect_handler = disconnect_handler;
907 t->cls = handler_cls;
909 t->tid = h->next_tid++;
910 h->next_tid |= GNUNET_MESH_LOCAL_TUNNEL_ID_MARK; // keep in range
911 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE);
912 msg.header.size = htons (sizeof (struct GNUNET_MESH_TunnelMessage));
913 msg.tunnel_id = htonl (t->tid);
914 send_packet (h, &msg.header);
920 * Destroy an existing tunnel.
922 * @param tun tunnel handle
925 GNUNET_MESH_tunnel_destroy (struct GNUNET_MESH_Tunnel *tun)
927 struct GNUNET_MESH_Handle *h;
928 struct GNUNET_MESH_TunnelMessage msg;
930 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: Destroying tunnel\n");
933 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY);
934 msg.header.size = htons (sizeof (struct GNUNET_MESH_TunnelMessage));
935 msg.tunnel_id = htonl (tun->tid);
937 send_packet (h, &msg.header);
942 * Request that a peer should be added to the tunnel. The existing
943 * connect handler will be called ONCE with either success or failure.
944 * This function should NOT be called again with the same peer before the
945 * connect handler is called.
947 * @param tunnel handle to existing tunnel
948 * @param timeout how long to try to establish a connection
949 * @param peer peer to add
952 GNUNET_MESH_peer_request_connect_add (struct GNUNET_MESH_Tunnel *tunnel,
953 const struct GNUNET_PeerIdentity *peer)
955 struct GNUNET_MESH_PeerControl msg;
956 GNUNET_PEER_Id peer_id;
959 peer_id = GNUNET_PEER_intern (peer);
960 for (i = 0; i < tunnel->npeers; i++)
962 if (tunnel->peers[i]->id == peer_id)
964 GNUNET_PEER_change_rc (peer_id, -1);
969 add_peer_to_tunnel (tunnel, peer);
971 msg.header.size = htons (sizeof (struct GNUNET_MESH_PeerControl));
972 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT_PEER_ADD);
973 msg.tunnel_id = htonl (tunnel->tid);
975 send_packet (tunnel->mesh, &msg.header);
982 * Request that a peer should be removed from the tunnel. The existing
983 * disconnect handler will be called ONCE if we were connected.
985 * @param tunnel handle to existing tunnel
986 * @param peer peer to remove
989 GNUNET_MESH_peer_request_connect_del (struct GNUNET_MESH_Tunnel *tunnel,
990 const struct GNUNET_PeerIdentity *peer)
992 struct GNUNET_MESH_PeerControl msg;
993 GNUNET_PEER_Id peer_id;
996 peer_id = GNUNET_PEER_search (peer);
1002 for (i = 0; i < tunnel->npeers; i++)
1003 if (tunnel->peers[i]->id == peer_id)
1005 if (i == tunnel->npeers)
1010 if (NULL != tunnel->disconnect_handler && tunnel->peers[i]->connected == 1)
1011 tunnel->disconnect_handler (tunnel->cls, peer);
1012 GNUNET_PEER_change_rc (peer_id, -1);
1013 GNUNET_free (tunnel->peers[i]);
1014 tunnel->peers[i] = tunnel->peers[tunnel->npeers - 1];
1015 GNUNET_array_grow (tunnel->peers, tunnel->npeers, tunnel->npeers - 1);
1017 msg.header.size = htons (sizeof (struct GNUNET_MESH_PeerControl));
1018 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT_PEER_DEL);
1019 msg.tunnel_id = htonl (tunnel->tid);
1020 memcpy (&msg.peer, peer, sizeof (struct GNUNET_PeerIdentity));
1021 send_packet (tunnel->mesh, &msg.header);
1026 * Request that the mesh should try to connect to a peer supporting the given
1029 * @param tunnel handle to existing tunnel
1030 * @param timeout how long to try to establish a connection
1031 * @param app_type application type that must be supported by the peer (MESH
1032 * should discover peer in proximity handling this type)
1035 GNUNET_MESH_peer_request_connect_by_type (struct GNUNET_MESH_Tunnel *tunnel,
1036 struct GNUNET_TIME_Relative timeout,
1037 GNUNET_MESH_ApplicationType app_type)
1039 struct GNUNET_MESH_ConnectPeerByType msg;
1041 /* FIXME: remember request connect by type for reconnect! */
1042 msg.header.size = htons (sizeof (struct GNUNET_MESH_ConnectPeerByType));
1043 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT_PEER_BY_TYPE);
1044 msg.tunnel_id = htonl (tunnel->tid);
1045 msg.type = htonl (app_type);
1046 send_packet (tunnel->mesh, &msg.header);
1051 * Ask the mesh to call "notify" once it is ready to transmit the
1052 * given number of bytes to the specified "target". If we are not yet
1053 * connected to the specified peer, a call to this function will cause
1054 * us to try to establish a connection.
1056 * @param tunnel tunnel to use for transmission
1057 * @param cork is corking allowed for this transmission?
1058 * @param priority how important is the message?
1059 * @param maxdelay how long can the message wait?
1060 * @param target destination for the message,
1061 * NULL for multicast to all tunnel targets
1062 * @param notify_size how many bytes of buffer space does notify want?
1063 * @param notify function to call when buffer space is available;
1064 * will be called with NULL on timeout or if the overall queue
1065 * for this peer is larger than queue_size and this is currently
1066 * the message with the lowest priority
1067 * @param notify_cls closure for notify
1068 * @return non-NULL if the notify callback was queued,
1069 * NULL if we can not even queue the request (insufficient
1070 * memory); if NULL is returned, "notify" will NOT be called.
1072 struct GNUNET_MESH_TransmitHandle *
1073 GNUNET_MESH_notify_transmit_ready (struct GNUNET_MESH_Tunnel *tunnel, int cork,
1075 struct GNUNET_TIME_Relative maxdelay,
1076 const struct GNUNET_PeerIdentity *target,
1078 GNUNET_CONNECTION_TransmitReadyNotify notify,
1081 struct GNUNET_MESH_TransmitHandle *th;
1084 if (tunnel->mesh->npackets >= tunnel->mesh->max_queue_size &&
1085 tunnel->npackets > 0)
1086 return NULL; /* queue full */
1088 tunnel->mesh->npackets++;
1089 th = GNUNET_malloc (sizeof (struct GNUNET_MESH_TransmitHandle));
1090 th->tunnel = tunnel;
1091 th->priority = priority;
1092 th->timeout = GNUNET_TIME_relative_to_absolute (maxdelay);
1093 th->target = GNUNET_PEER_intern (target);
1096 target) ? sizeof (struct GNUNET_MESH_Multicast) : sizeof (struct
1097 GNUNET_MESH_Unicast);
1098 th->size = notify_size + overhead;
1099 th->notify = notify;
1100 th->notify_cls = notify_cls;
1101 add_to_queue (tunnel->mesh, th);
1107 * Cancel the specified transmission-ready notification.
1109 * @param th handle that was returned by "notify_transmit_ready".
1112 GNUNET_MESH_notify_transmit_ready_cancel (struct GNUNET_MESH_TransmitHandle *th)
1114 struct GNUNET_MESH_Handle *mesh;
1116 mesh = th->tunnel->mesh;
1117 if (th->timeout_task != GNUNET_SCHEDULER_NO_TASK)
1118 GNUNET_SCHEDULER_cancel (th->timeout_task);
1119 GNUNET_CONTAINER_DLL_remove (mesh->th_head, mesh->th_tail, th);
1121 if ((NULL == mesh->th_head) && (NULL != mesh->th))
1123 /* queue empty, no point in asking for transmission */
1124 GNUNET_CLIENT_notify_transmit_ready_cancel (mesh->th);
1130 #if 0 /* keep Emacsens' auto-indent happy */