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
24 * - callbacks to client missing on certain events
25 * - processing messages from service is incomplete
30 * - AUXILIARY FUNCTIONS
33 * - API CALL DEFINITIONS
38 #if 0 /* keep Emacsens' auto-indent happy */
44 #include "gnunet_common.h"
45 #include "gnunet_client_lib.h"
46 #include "gnunet_util_lib.h"
47 #include "gnunet_peer_lib.h"
48 #include "gnunet_mesh_service_new.h"
50 #include "mesh_protocol.h"
53 /******************************************************************************/
54 /************************ DATA STRUCTURES ****************************/
55 /******************************************************************************/
58 * Transmission queue to the service
60 struct GNUNET_MESH_TransmitHandle
66 struct GNUNET_MESH_TransmitHandle *next;
71 struct GNUNET_MESH_TransmitHandle *prev;
74 * Tunnel this message is sent over (may be NULL for control messages).
76 struct GNUNET_MESH_Tunnel *tunnel;
79 * Data itself, currently points to the end of this struct if
80 * we have a message already, NULL if the message is to be
81 * obtained from the callback.
83 const struct GNUNET_MessageHeader *data;
86 * Callback to obtain the message to transmit, or NULL if we
87 * got the message in 'data'. Notice that messages built
88 * by 'notify' need to be encapsulated with information about
91 GNUNET_CONNECTION_TransmitReadyNotify notify;
94 * Closure for 'notify'
99 * How long is this message valid. Once the timeout has been
100 * reached, the message must no longer be sent. If this
101 * is a message with a 'notify' callback set, the 'notify'
102 * function should be called with 'buf' NULL and size 0.
104 struct GNUNET_TIME_Absolute timeout;
107 * Task triggering a timeout, can be NO_TASK if the timeout is FOREVER.
109 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
112 * Priority of the message. The queue is sorted by priority,
113 * control messages have the maximum priority (UINT32_MAX).
118 * Target of the message, 0 for broadcast. This field
119 * is only valid if 'notify' is non-NULL.
121 GNUNET_PEER_Id target;
124 * Size of 'data' -- or the desired size of 'notify' if 'data' is NULL.
131 * Opaque handle to the service.
133 struct GNUNET_MESH_Handle
137 * Handle to the server connection, to send messages later
139 struct GNUNET_CLIENT_Connection *client;
142 * Set of handlers used for processing incoming messages in the tunnels
144 const struct GNUNET_MESH_MessageHandler *message_handlers;
147 * Set of applications that should be claimed to be offered at this node.
148 * Note that this is just informative, the appropiate handlers must be
149 * registered independently and the mapping is up to the developer of the
150 * client application.
152 const GNUNET_MESH_ApplicationType *applications;
155 * Double linked list of the tunnels this client is connected to.
157 struct GNUNET_MESH_Tunnel *tunnels_head;
158 struct GNUNET_MESH_Tunnel *tunnels_tail;
161 * Callback for inbound tunnel creation
163 GNUNET_MESH_InboundTunnelNotificationHandler *new_tunnel;
166 * Callback for inbound tunnel disconnection
168 GNUNET_MESH_TunnelEndHandler *cleaner;
171 * Handle to cancel pending transmissions in case of disconnection
173 struct GNUNET_CLIENT_TransmitHandle *th;
176 * Closure for all the handlers given by the client
181 * Messages to send to the service
183 struct GNUNET_MESH_TransmitHandle *th_head;
184 struct GNUNET_MESH_TransmitHandle *th_tail;
187 * tid of the next tunnel to create (to avoid reusing IDs often)
189 MESH_TunnelNumber next_tid;
190 unsigned int n_handlers;
191 unsigned int n_applications;
192 unsigned int max_queue_size;
195 * Have we started the task to receive messages from the service
196 * yet? We do this after we send the 'MESH_LOCAL_CONNECT' message.
201 * Number of packets queued
203 unsigned int npackets;
206 * Configuration given by the client, in case of reconnection
208 const struct GNUNET_CONFIGURATION_Handle *cfg;
213 * Description of a peer
215 struct GNUNET_MESH_Peer
218 * ID of the peer in short form
223 * Tunnel this peer belongs to
225 struct GNUNET_MESH_Tunnel *t;
228 * Flag indicating whether service has informed about its connection
236 * Opaque handle to a tunnel.
238 struct GNUNET_MESH_Tunnel
244 struct GNUNET_MESH_Tunnel *next;
245 struct GNUNET_MESH_Tunnel *prev;
248 * Callback to execute when peers connect to the tunnel
250 GNUNET_MESH_TunnelConnectHandler connect_handler;
253 * Callback to execute when peers disconnect from the tunnel
255 GNUNET_MESH_TunnelDisconnectHandler disconnect_handler;
258 * Closure for the connect/disconnect handlers
263 * Handle to the mesh this tunnel belongs to
265 struct GNUNET_MESH_Handle *mesh;
268 * Local ID of the tunnel
270 MESH_TunnelNumber tid;
273 * Owner of the tunnel
275 GNUNET_PEER_Id owner;
278 * All peers added to the tunnel
280 struct GNUNET_MESH_Peer **peers;
283 * List of application types that have been requested for this tunnel
285 GNUNET_MESH_ApplicationType *apps;
288 * Any data the caller wants to put in here
293 * Number of peers added to the tunnel
298 * Number of packets queued in this tunnel
300 unsigned int npackets;
303 * Number of applications requested this tunnel
310 /******************************************************************************/
311 /*********************** AUXILIARY FUNCTIONS *************************/
312 /******************************************************************************/
315 * Get the tunnel handler for the tunnel specified by id from the given handle
316 * @param h Mesh handle
317 * @param tid ID of the wanted tunnel
318 * @return handle to the required tunnel or NULL if not found
320 static struct GNUNET_MESH_Tunnel *
321 retrieve_tunnel (struct GNUNET_MESH_Handle *h, MESH_TunnelNumber tid)
323 struct GNUNET_MESH_Tunnel *t;
337 * Create a new tunnel and insert it in the tunnel list of the mesh handle
338 * @param h Mesh handle
339 * @param tid desired tid of the tunnel, 0 to assign one automatically
340 * @return handle to the created tunnel
342 static struct GNUNET_MESH_Tunnel *
343 create_tunnel (struct GNUNET_MESH_Handle *h, MESH_TunnelNumber tid)
345 struct GNUNET_MESH_Tunnel *t;
347 t = GNUNET_malloc (sizeof (struct GNUNET_MESH_Tunnel));
348 GNUNET_CONTAINER_DLL_insert (h->tunnels_head, h->tunnels_tail, t);
352 t->tid = h->next_tid;
353 while (NULL != retrieve_tunnel (h, h->next_tid))
356 h->next_tid &= ~GNUNET_MESH_LOCAL_TUNNEL_ID_SERV;
357 h->next_tid |= GNUNET_MESH_LOCAL_TUNNEL_ID_CLI;
369 * Get the tunnel handler for the tunnel specified by id from the given handle
370 * @param h Mesh handle
371 * @param tid ID of the wanted tunnel
372 * @return handle to the required tunnel or NULL if not found
375 destroy_tunnel (struct GNUNET_MESH_Tunnel *t)
377 struct GNUNET_MESH_Handle *h;
378 struct GNUNET_PeerIdentity pi;
387 /* TODO remove data packets from queue */
388 GNUNET_CONTAINER_DLL_remove (h->tunnels_head, h->tunnels_tail, t);
389 for (i = 0; i < t->npeers; i++)
391 if (NULL != t->disconnect_handler && t->peers[i]->connected)
393 GNUNET_PEER_resolve (t->peers[i]->id, &pi);
394 t->disconnect_handler (t->cls, &pi);
396 GNUNET_PEER_change_rc (t->peers[i]->id, -1);
397 GNUNET_free (t->peers[i]);
399 if (NULL != h->cleaner && 0 != t->owner)
400 h->cleaner (h->cls, t, t->ctx);
402 GNUNET_PEER_change_rc (t->owner, -1);
403 if (0 != t->napps && t->apps)
404 GNUNET_free (t->apps);
406 GNUNET_free (t->peers);
412 * Get the peer descriptor for the peer with id from the given tunnel
413 * @param t Tunnel handle
414 * @param id Short form ID of the wanted peer
415 * @return handle to the requested peer or NULL if not found
417 static struct GNUNET_MESH_Peer *
418 retrieve_peer (struct GNUNET_MESH_Tunnel *t, GNUNET_PEER_Id id)
422 for (i = 0; i < t->npeers; i++)
423 if (t->peers[i]->id == id)
430 * Add a peer into a tunnel
431 * @param t Tunnel handle
432 * @param pi Full ID of the new peer
433 * @return handle to the newly created peer
435 static struct GNUNET_MESH_Peer *
436 add_peer_to_tunnel (struct GNUNET_MESH_Tunnel *t,
437 const struct GNUNET_PeerIdentity *pi)
439 struct GNUNET_MESH_Peer *p;
447 id = GNUNET_PEER_intern (pi);
449 p = GNUNET_malloc (sizeof (struct GNUNET_MESH_Peer));
452 GNUNET_array_append (t->peers, t->npeers, p);
458 * Remove a peer from a tunnel
459 * @param t Tunnel handle
460 * @param p Peer handle
463 remove_peer_from_tunnel (struct GNUNET_MESH_Peer *p)
467 for (i = 0; i < p->t->npeers; i++)
469 if (p->t->peers[i] == p)
472 if (i == p->t->npeers)
477 p->t->peers[i] = p->t->peers[p->t->npeers - 1];
478 GNUNET_array_grow (p->t->peers, p->t->npeers, p->t->npeers - 1);
483 * Notify client that the transmission has timed out
485 * @param tc task context
488 timeout_transmission (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
490 struct GNUNET_MESH_TransmitHandle *th = cls;
491 struct GNUNET_MESH_Handle *mesh;
493 mesh = th->tunnel->mesh;
494 GNUNET_CONTAINER_DLL_remove (mesh->th_head, mesh->th_tail, th);
495 if (th->notify != NULL)
496 th->notify (th->notify_cls, 0, NULL);
498 if ((NULL == mesh->th_head) && (NULL != mesh->th))
500 /* queue empty, no point in asking for transmission */
501 GNUNET_CLIENT_notify_transmit_ready_cancel (mesh->th);
508 * Add a transmit handle to the transmission queue by priority and set the
511 * @param h mesh handle with the queue head and tail
512 * @param q handle to the packet to be transmitted
515 add_to_queue (struct GNUNET_MESH_Handle *h,
516 struct GNUNET_MESH_TransmitHandle *th)
518 struct GNUNET_MESH_TransmitHandle *p;
521 while ((NULL != p) && (th->priority <= p->priority))
527 GNUNET_CONTAINER_DLL_insert_after (h->th_head, h->th_tail, p, th);
528 if (GNUNET_TIME_UNIT_FOREVER_ABS.abs_value == th->timeout.abs_value)
531 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_absolute_get_remaining
532 (th->timeout), &timeout_transmission, th);
537 send_packet (struct GNUNET_MESH_Handle *h,
538 const struct GNUNET_MessageHeader *msg);
542 * Reconnect to the service, retransmit all infomation to try to restore the
545 * @param h handle to the mesh
547 * @return GNUNET_YES in case of sucess, GNUNET_NO otherwise (service down...)
550 reconnect (struct GNUNET_MESH_Handle *h)
552 struct GNUNET_MESH_Tunnel *t;
555 h->in_receive = GNUNET_NO;
559 GNUNET_CLIENT_notify_transmit_ready_cancel (h->th);
561 if (NULL != h->client)
563 GNUNET_CLIENT_disconnect (h->client, GNUNET_NO);
567 h->client = GNUNET_CLIENT_connect ("mesh", h->cfg);
568 if (h->client == NULL)
570 /* FIXME: panic? exponential backoff retry? */
574 /* Rebuild all tunnels */
575 for (t = h->tunnels_head; NULL != t; t = t->next)
577 struct GNUNET_MESH_TunnelMessage tmsg;
578 struct GNUNET_MESH_PeerControl pmsg;
580 tmsg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE);
581 tmsg.header.size = htons (sizeof (struct GNUNET_MESH_TunnelMessage));
582 tmsg.tunnel_id = htonl (t->tid);
583 send_packet (h, &tmsg.header);
585 pmsg.header.size = htons (sizeof (struct GNUNET_MESH_PeerControl));
586 pmsg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD);
587 pmsg.tunnel_id = htonl (t->tid);
589 /* Reconnect all peers */
590 for (i = 0; i < t->npeers; i++)
592 GNUNET_PEER_resolve (t->peers[i]->id, &pmsg.peer);
593 if (NULL != t->disconnect_handler && t->peers[i]->connected)
594 t->disconnect_handler (t->cls, &pmsg.peer);
595 /* If the tunnel was "by type", dont connect individual peers */
597 send_packet (t->mesh, &pmsg.header);
599 /* Reconnect all types, if any */
600 for (i = 0; i < t->napps; i++)
602 struct GNUNET_MESH_ConnectPeerByType msg;
604 msg.header.size = htons (sizeof (struct GNUNET_MESH_ConnectPeerByType));
605 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD_BY_TYPE);
606 msg.tunnel_id = htonl (t->tid);
607 msg.type = htonl (t->apps[i]);
608 send_packet (t->mesh, &msg.header);
615 /******************************************************************************/
616 /*********************** RECEIVE HANDLERS ****************************/
617 /******************************************************************************/
620 * Process the new tunnel notification and add it to the tunnels in the handle
622 * @param h The mesh handle
623 * @param msg A message with the details of the new incoming tunnel
626 process_tunnel_create (struct GNUNET_MESH_Handle *h,
627 const struct GNUNET_MESH_TunnelMessage *msg)
629 struct GNUNET_MESH_Tunnel *t;
630 struct GNUNET_TRANSPORT_ATS_Information atsi;
631 MESH_TunnelNumber tid;
633 tid = ntohl (msg->tunnel_id);
634 if (tid <= GNUNET_MESH_LOCAL_TUNNEL_ID_CLI)
639 t = create_tunnel (h, tid);
640 t->owner = GNUNET_PEER_intern (&msg->peer);
642 t->peers = GNUNET_malloc (sizeof (struct GNUNET_MESH_Peer *));
643 t->peers[0] = GNUNET_malloc (sizeof (struct GNUNET_MESH_Peer));
645 t->peers[0]->connected = 1;
646 t->peers[0]->id = t->owner;
649 if (NULL != h->new_tunnel)
653 t->ctx = h->new_tunnel(h->cls, t, &msg->peer, &atsi);
655 GNUNET_CONTAINER_DLL_insert (h->tunnels_head, h->tunnels_tail, t);
661 * Process the tunnel destroy notification and free associated resources
663 * @param h The mesh handle
664 * @param msg A message with the details of the tunnel being destroyed
667 process_tunnel_destroy (struct GNUNET_MESH_Handle *h,
668 const struct GNUNET_MESH_TunnelMessage *msg)
670 struct GNUNET_MESH_Tunnel *t;
671 MESH_TunnelNumber tid;
673 tid = ntohl (msg->tunnel_id);
674 t = retrieve_tunnel (h, tid);
692 * Process the new peer event and notify the upper level of it
694 * @param h The mesh handle
695 * @param msg A message with the details of the peer event
698 process_peer_event (struct GNUNET_MESH_Handle *h,
699 const struct GNUNET_MESH_PeerControl *msg)
701 struct GNUNET_MESH_Tunnel *t;
702 struct GNUNET_MESH_Peer *p;
703 struct GNUNET_TRANSPORT_ATS_Information atsi;
707 size = ntohs (msg->header.size);
708 if (size != sizeof (struct GNUNET_MESH_PeerControl))
713 t = retrieve_tunnel (h, ntohl (msg->tunnel_id));
719 id = GNUNET_PEER_search (&msg->peer);
720 if ((p = retrieve_peer (t, id)) == NULL)
721 p = add_peer_to_tunnel (t, &msg->peer);
722 if (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD == msg->header.type)
724 if (NULL != t->connect_handler)
728 t->connect_handler (t->cls, &msg->peer, &atsi);
734 if (NULL != t->disconnect_handler && p->connected)
736 t->disconnect_handler (t->cls, &msg->peer);
738 remove_peer_from_tunnel (p);
745 * Process the incoming data packets
747 * @param h The mesh handle
748 * @param msh A message encapsulating the data
751 process_incoming_data (struct GNUNET_MESH_Handle *h,
752 const struct GNUNET_MessageHeader *message)
754 const struct GNUNET_MessageHeader *payload;
755 const struct GNUNET_MESH_MessageHandler *handler;
756 const struct GNUNET_PeerIdentity *peer;
757 struct GNUNET_MESH_Unicast *ucast;
758 struct GNUNET_MESH_Multicast *mcast;
759 struct GNUNET_MESH_ToOrigin *to_orig;
760 struct GNUNET_MESH_Tunnel *t;
764 type = ntohs (message->type);
767 case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
768 ucast = (struct GNUNET_MESH_Unicast *) message;
769 t = retrieve_tunnel (h, ntohl (ucast->tid));
770 payload = (struct GNUNET_MessageHeader *) &ucast[1];
773 case GNUNET_MESSAGE_TYPE_MESH_MULTICAST:
774 mcast = (struct GNUNET_MESH_Multicast *) message;
775 t = retrieve_tunnel (h, ntohl (mcast->tid));
776 payload = (struct GNUNET_MessageHeader *) &mcast[1];
779 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
780 to_orig = (struct GNUNET_MESH_ToOrigin *) message;
781 t = retrieve_tunnel (h, ntohl (to_orig->tid));
782 payload = (struct GNUNET_MessageHeader *) &to_orig[1];
783 peer = &to_orig->sender;
794 for (i = 0; i < h->n_handlers; i++)
796 handler = &h->message_handlers[i];
797 if (handler->type == type)
799 struct GNUNET_TRANSPORT_ATS_Information atsi;
804 handler->callback (h->cls, t, &t->ctx, peer, payload, &atsi))
806 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
807 "MESH: callback completed successfully\n");
811 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
812 "MESH: callback caused disconnection\n");
813 GNUNET_MESH_disconnect (h);
821 * Function to process all messages received from the service
824 * @param msg message received, NULL on timeout or fatal error
827 msg_received (void *cls, const struct GNUNET_MessageHeader *msg)
829 struct GNUNET_MESH_Handle *h = cls;
831 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: received a message from MESH\n");
837 switch (ntohs (msg->type))
839 /* Notify of a new incoming tunnel */
840 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE:
841 process_tunnel_create (h, (struct GNUNET_MESH_TunnelMessage *) msg);
843 /* Notify of a tunnel disconnection */
844 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY:
845 process_tunnel_destroy (h, (struct GNUNET_MESH_TunnelMessage *) msg);
847 /* Notify of a new peer or a peer disconnect in the tunnel */
848 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD:
849 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_DEL:
850 process_peer_event (h, (struct GNUNET_MESH_PeerControl *) msg);
852 /* Notify of a new data packet in the tunnel */
853 case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
854 case GNUNET_MESSAGE_TYPE_MESH_MULTICAST:
855 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
856 process_incoming_data (h, msg);
858 /* We shouldn't get any other packages, log and ignore */
860 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
861 "MESH: unsolicited message form service (type %d)\n",
864 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: message processed\n");
865 GNUNET_CLIENT_receive (h->client, &msg_received, h,
866 GNUNET_TIME_UNIT_FOREVER_REL);
870 /******************************************************************************/
871 /************************ SEND FUNCTIONS ****************************/
872 /******************************************************************************/
875 * Function called to send a message to the service.
876 * "buf" will be NULL and "size" zero if the socket was closed for writing in
879 * @param cls closure, the mesh handle
880 * @param size number of bytes available in buf
881 * @param buf where the callee should write the connect message
882 * @return number of bytes written to buf
885 send_callback (void *cls, size_t size, void *buf)
887 struct GNUNET_MESH_Handle *h = cls;
888 struct GNUNET_MESH_TransmitHandle *th;
893 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: Send packet() Buffer %u\n", size);
895 if ((0 == size) || (NULL == buf))
901 while ((NULL != (th = h->th_head)) && (size >= th->size))
903 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: type: %u\n",
904 ntohs (th->data->type));
905 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: size: %u\n",
906 ntohs (th->data->size));
907 if (NULL == th->data)
909 GNUNET_assert (NULL != th->notify);
913 struct GNUNET_MESH_Multicast mc;
915 GNUNET_assert (size >= sizeof (mc) + th->size);
917 th->notify (th->notify_cls, size - sizeof (mc), &cbuf[sizeof (mc)]);
920 mc.header.size = htons (sizeof (mc) + th->size);
921 mc.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_MULTICAST);
922 mc.tid = htonl (th->tunnel->tid);
923 memset (&mc.oid, 0, sizeof (struct GNUNET_PeerIdentity)); /* myself */
924 memcpy (cbuf, &mc, sizeof (mc));
925 psize = th->size + sizeof (mc);
931 struct GNUNET_MESH_Unicast uc;
933 GNUNET_assert (size >= sizeof (uc) + th->size);
935 th->notify (th->notify_cls, size - sizeof (uc), &cbuf[sizeof (uc)]);
938 uc.header.size = htons (sizeof (uc) + th->size);
939 uc.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_UNICAST);
940 uc.tid = htonl (th->tunnel->tid);
941 memset (&uc.oid, 0, sizeof (struct GNUNET_PeerIdentity)); /* myself */
942 GNUNET_PEER_resolve (th->target, &uc.destination);
943 memcpy (cbuf, &uc, sizeof (uc));
944 psize = th->size + sizeof (uc);
950 memcpy (cbuf, th->data, th->size);
953 if (th->timeout_task != GNUNET_SCHEDULER_NO_TASK)
954 GNUNET_SCHEDULER_cancel (th->timeout_task);
955 GNUNET_CONTAINER_DLL_remove (h->th_head, h->th_tail, th);
961 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: total size: %u\n", tsize);
962 if (NULL != (th = h->th_head))
964 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: next size: %u\n", th->size);
966 GNUNET_CLIENT_notify_transmit_ready (h->client, th->size,
967 GNUNET_TIME_UNIT_FOREVER_REL,
968 GNUNET_YES, &send_callback, h);
970 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: Send packet() END\n");
971 if (GNUNET_NO == h->in_receive)
973 h->in_receive = GNUNET_YES;
974 GNUNET_CLIENT_receive (h->client, &msg_received, h,
975 GNUNET_TIME_UNIT_FOREVER_REL);
982 * Auxiliary function to send an already constructed packet to the service.
983 * Takes care of creating a new queue element, copying the message and
984 * calling the tmt_rdy function if necessary.
985 * @param h mesh handle
986 * @param msg message to transmit
989 send_packet (struct GNUNET_MESH_Handle *h,
990 const struct GNUNET_MessageHeader *msg)
992 struct GNUNET_MESH_TransmitHandle *th;
995 msize = ntohs (msg->size);
996 th = GNUNET_malloc (sizeof (struct GNUNET_MESH_TransmitHandle) + msize);
997 th->priority = UINT32_MAX;
998 th->timeout = GNUNET_TIME_UNIT_FOREVER_ABS;
1000 th->data = (void *) &th[1];
1001 memcpy (&th[1], msg, msize);
1002 add_to_queue (h, th);
1006 GNUNET_CLIENT_notify_transmit_ready (h->client, msize,
1007 GNUNET_TIME_UNIT_FOREVER_REL,
1008 GNUNET_YES, &send_callback, h);
1012 /******************************************************************************/
1013 /********************** API CALL DEFINITIONS *************************/
1014 /******************************************************************************/
1017 * Connect to the mesh service.
1019 * @param cfg configuration to use
1020 * @param queue_size size of the data message queue, shared among all tunnels
1021 * (each tunnel is guaranteed to accept at least one message,
1022 * no matter what is the status of other tunnels)
1023 * @param cls closure for the various callbacks that follow
1024 * (including handlers in the handlers array)
1025 * @param new_tunnel function called when an *inbound* tunnel is created
1026 * @param cleaner function called when an *inbound* tunnel is destroyed
1027 * @param handlers callbacks for messages we care about, NULL-terminated
1028 * note that the mesh is allowed to drop notifications about
1029 * inbound messages if the client does not process them fast
1030 * enough (for this notification type, a bounded queue is used)
1031 * @param stypes list of the applications that this client claims to provide
1032 * @return handle to the mesh service NULL on error
1033 * (in this case, init is never called)
1035 struct GNUNET_MESH_Handle *
1036 GNUNET_MESH_connect (const struct GNUNET_CONFIGURATION_Handle *cfg,
1037 unsigned int queue_size, void *cls,
1038 GNUNET_MESH_InboundTunnelNotificationHandler new_tunnel,
1039 GNUNET_MESH_TunnelEndHandler cleaner,
1040 const struct GNUNET_MESH_MessageHandler *handlers,
1041 const GNUNET_MESH_ApplicationType *stypes)
1043 struct GNUNET_MESH_Handle *h;
1044 struct GNUNET_MESH_ClientConnect *msg;
1045 GNUNET_MESH_ApplicationType *apps;
1051 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: GNUNET_MESH_connect()\n");
1052 h = GNUNET_malloc (sizeof (struct GNUNET_MESH_Handle));
1054 h->max_queue_size = queue_size;
1055 h->new_tunnel = new_tunnel;
1056 h->cleaner = cleaner;
1057 h->client = GNUNET_CLIENT_connect ("mesh", cfg);
1058 if (h->client == NULL)
1065 h->message_handlers = handlers;
1066 h->applications = stypes;
1067 h->next_tid = GNUNET_MESH_LOCAL_TUNNEL_ID_CLI;
1069 /* count handlers and apps, calculate size */
1070 for (h->n_handlers = 0; handlers[h->n_handlers].type; h->n_handlers++) ;
1071 for (h->n_applications = 0; stypes[h->n_applications]; h->n_applications++) ;
1072 size = sizeof (struct GNUNET_MESH_ClientConnect);
1073 size += h->n_handlers * sizeof (uint16_t);
1074 size += h->n_applications * sizeof (GNUNET_MESH_ApplicationType);
1079 /* build connection packet */
1080 msg = (struct GNUNET_MESH_ClientConnect *) buf;
1081 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT);
1082 msg->header.size = htons (size);
1083 types = (uint16_t *) & msg[1];
1084 for (ntypes = 0; ntypes < h->n_handlers; ntypes++)
1085 types[ntypes] = h->message_handlers[ntypes].type;
1086 apps = (GNUNET_MESH_ApplicationType *) &types[ntypes];
1087 for (napps = 0; napps < h->n_applications; napps++)
1088 apps[napps] = h->applications[napps];
1089 msg->applications = htons (napps);
1090 msg->types = htons (ntypes);
1091 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1092 "mesh: Sending %lu bytes long message %d types and %d apps\n",
1093 ntohs (msg->header.size), ntypes, napps);
1094 send_packet (h, &msg->header);
1096 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: GNUNET_MESH_connect() END\n");
1102 * Disconnect from the mesh service.
1104 * @param handle connection to mesh to disconnect
1107 GNUNET_MESH_disconnect (struct GNUNET_MESH_Handle *handle)
1109 struct GNUNET_MESH_Tunnel *t;
1111 for (t = handle->tunnels_head; NULL != t; t = t->next)
1115 if (NULL != handle->th)
1117 GNUNET_CLIENT_notify_transmit_ready_cancel (handle->th);
1119 if (NULL != handle->client)
1121 GNUNET_CLIENT_disconnect (handle->client, GNUNET_NO);
1123 GNUNET_free (handle);
1128 * Create a new tunnel (we're initiator and will be allowed to add/remove peers
1129 * and to broadcast).
1131 * @param h mesh handle
1132 * @param tunnel_ctx client's tunnel context to associate with the tunnel
1133 * @param connect_handler function to call when peers are actually connected
1134 * @param disconnect_handler function to call when peers are disconnected
1135 * @param handler_cls closure for connect/disconnect handlers
1137 struct GNUNET_MESH_Tunnel *
1138 GNUNET_MESH_tunnel_create (struct GNUNET_MESH_Handle *h, void *tunnel_ctx,
1139 GNUNET_MESH_TunnelConnectHandler connect_handler,
1140 GNUNET_MESH_TunnelDisconnectHandler
1141 disconnect_handler, void *handler_cls)
1143 struct GNUNET_MESH_Tunnel *t;
1144 struct GNUNET_MESH_TunnelMessage msg;
1146 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: Creating new tunnel\n");
1147 t = create_tunnel (h, 0);
1148 t->connect_handler = connect_handler;
1149 t->disconnect_handler = disconnect_handler;
1150 t->cls = handler_cls;
1151 t->ctx = tunnel_ctx;
1152 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE);
1153 msg.header.size = htons (sizeof (struct GNUNET_MESH_TunnelMessage));
1154 msg.tunnel_id = htonl (t->tid);
1155 send_packet (h, &msg.header);
1161 * Destroy an existing tunnel.
1163 * @param tun tunnel handle
1166 GNUNET_MESH_tunnel_destroy (struct GNUNET_MESH_Tunnel *t)
1168 struct GNUNET_MESH_Handle *h;
1169 struct GNUNET_MESH_TunnelMessage msg;
1171 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: Destroying tunnel\n");
1175 GNUNET_PEER_change_rc (t->owner, -1);
1177 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY);
1178 msg.header.size = htons (sizeof (struct GNUNET_MESH_TunnelMessage));
1179 msg.tunnel_id = htonl (t->tid);
1181 send_packet (h, &msg.header);
1186 * Request that a peer should be added to the tunnel. The existing
1187 * connect handler will be called ONCE with either success or failure.
1188 * This function should NOT be called again with the same peer before the
1189 * connect handler is called.
1191 * @param tunnel handle to existing tunnel
1192 * @param timeout how long to try to establish a connection
1193 * @param peer peer to add
1196 GNUNET_MESH_peer_request_connect_add (struct GNUNET_MESH_Tunnel *tunnel,
1197 const struct GNUNET_PeerIdentity *peer)
1199 struct GNUNET_MESH_PeerControl msg;
1200 GNUNET_PEER_Id peer_id;
1203 peer_id = GNUNET_PEER_intern (peer);
1204 for (i = 0; i < tunnel->npeers; i++)
1206 if (tunnel->peers[i]->id == peer_id)
1208 GNUNET_PEER_change_rc (peer_id, -1);
1213 if (NULL == add_peer_to_tunnel (tunnel, peer))
1216 msg.header.size = htons (sizeof (struct GNUNET_MESH_PeerControl));
1217 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD);
1218 msg.tunnel_id = htonl (tunnel->tid);
1220 send_packet (tunnel->mesh, &msg.header);
1227 * Request that a peer should be removed from the tunnel. The existing
1228 * disconnect handler will be called ONCE if we were connected.
1230 * @param tunnel handle to existing tunnel
1231 * @param peer peer to remove
1234 GNUNET_MESH_peer_request_connect_del (struct GNUNET_MESH_Tunnel *tunnel,
1235 const struct GNUNET_PeerIdentity *peer)
1237 struct GNUNET_MESH_PeerControl msg;
1238 GNUNET_PEER_Id peer_id;
1241 peer_id = GNUNET_PEER_search (peer);
1247 for (i = 0; i < tunnel->npeers; i++)
1248 if (tunnel->peers[i]->id == peer_id)
1250 if (i == tunnel->npeers)
1255 if (NULL != tunnel->disconnect_handler && tunnel->peers[i]->connected == 1)
1256 tunnel->disconnect_handler (tunnel->cls, peer);
1257 GNUNET_PEER_change_rc (peer_id, -1);
1258 GNUNET_free (tunnel->peers[i]);
1259 tunnel->peers[i] = tunnel->peers[tunnel->npeers - 1];
1260 GNUNET_array_grow (tunnel->peers, tunnel->npeers, tunnel->npeers - 1);
1262 msg.header.size = htons (sizeof (struct GNUNET_MESH_PeerControl));
1263 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_DEL);
1264 msg.tunnel_id = htonl (tunnel->tid);
1265 memcpy (&msg.peer, peer, sizeof (struct GNUNET_PeerIdentity));
1266 send_packet (tunnel->mesh, &msg.header);
1271 * Request that the mesh should try to connect to a peer supporting the given
1274 * @param tunnel handle to existing tunnel
1275 * @param app_type application type that must be supported by the peer (MESH
1276 * should discover peer in proximity handling this type)
1279 GNUNET_MESH_peer_request_connect_by_type (struct GNUNET_MESH_Tunnel *tunnel,
1280 GNUNET_MESH_ApplicationType app_type)
1282 struct GNUNET_MESH_ConnectPeerByType msg;
1284 GNUNET_array_append (tunnel->apps, tunnel->napps, app_type);
1286 msg.header.size = htons (sizeof (struct GNUNET_MESH_ConnectPeerByType));
1287 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD_BY_TYPE);
1288 msg.tunnel_id = htonl (tunnel->tid);
1289 msg.type = htonl (app_type);
1290 send_packet (tunnel->mesh, &msg.header);
1295 * Ask the mesh to call "notify" once it is ready to transmit the
1296 * given number of bytes to the specified "target". If we are not yet
1297 * connected to the specified peer, a call to this function will cause
1298 * us to try to establish a connection.
1300 * @param tunnel tunnel to use for transmission
1301 * @param cork is corking allowed for this transmission?
1302 * @param priority how important is the message?
1303 * @param maxdelay how long can the message wait?
1304 * @param target destination for the message,
1305 * NULL for multicast to all tunnel targets
1306 * @param notify_size how many bytes of buffer space does notify want?
1307 * @param notify function to call when buffer space is available;
1308 * will be called with NULL on timeout or if the overall queue
1309 * for this peer is larger than queue_size and this is currently
1310 * the message with the lowest priority
1311 * @param notify_cls closure for notify
1312 * @return non-NULL if the notify callback was queued,
1313 * NULL if we can not even queue the request (insufficient
1314 * memory); if NULL is returned, "notify" will NOT be called.
1316 struct GNUNET_MESH_TransmitHandle *
1317 GNUNET_MESH_notify_transmit_ready (struct GNUNET_MESH_Tunnel *tunnel, int cork,
1319 struct GNUNET_TIME_Relative maxdelay,
1320 const struct GNUNET_PeerIdentity *target,
1322 GNUNET_CONNECTION_TransmitReadyNotify notify,
1325 struct GNUNET_MESH_TransmitHandle *th;
1328 if (tunnel->mesh->npackets >= tunnel->mesh->max_queue_size &&
1329 tunnel->npackets > 0)
1330 return NULL; /* queue full */
1332 tunnel->mesh->npackets++;
1333 th = GNUNET_malloc (sizeof (struct GNUNET_MESH_TransmitHandle));
1334 th->tunnel = tunnel;
1335 th->priority = priority;
1336 th->timeout = GNUNET_TIME_relative_to_absolute (maxdelay);
1337 th->target = GNUNET_PEER_intern (target);
1340 target) ? sizeof (struct GNUNET_MESH_Multicast) : sizeof (struct
1341 GNUNET_MESH_Unicast);
1342 th->size = notify_size + overhead;
1343 th->notify = notify;
1344 th->notify_cls = notify_cls;
1345 add_to_queue (tunnel->mesh, th);
1351 * Cancel the specified transmission-ready notification.
1353 * @param th handle that was returned by "notify_transmit_ready".
1356 GNUNET_MESH_notify_transmit_ready_cancel (struct GNUNET_MESH_TransmitHandle *th)
1358 struct GNUNET_MESH_Handle *mesh;
1360 mesh = th->tunnel->mesh;
1361 if (th->timeout_task != GNUNET_SCHEDULER_NO_TASK)
1362 GNUNET_SCHEDULER_cancel (th->timeout_task);
1363 GNUNET_CONTAINER_DLL_remove (mesh->th_head, mesh->th_tail, th);
1365 if ((NULL == mesh->th_head) && (NULL != mesh->th))
1367 /* queue empty, no point in asking for transmission */
1368 GNUNET_CLIENT_notify_transmit_ready_cancel (mesh->th);
1374 #if 0 /* keep Emacsens' auto-indent happy */