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21 * @file cadet/cadet_api.c
22 * @brief cadet api: client implementation of cadet service
23 * @author Bartlomiej Polot
24 * @author Christian Grothoff
27 #include "gnunet_util_lib.h"
28 #include "gnunet_constants.h"
29 #include "gnunet_cadet_service.h"
31 #include "cadet_protocol.h"
33 #define LOG(kind,...) GNUNET_log_from (kind, "cadet-api",__VA_ARGS__)
44 GNUNET_CADET_ChannelCB channel_cb;
49 GNUNET_CADET_PeersCB peers_cb;
54 GNUNET_CADET_PeerCB peer_cb;
59 GNUNET_CADET_TunnelsCB tunnels_cb;
64 GNUNET_CADET_TunnelCB tunnel_cb;
69 * Opaque handle to the service.
71 struct GNUNET_CADET_Handle
76 struct GNUNET_MQ_Handle *mq;
81 struct GNUNET_CONTAINER_MultiHashMap *ports;
86 struct GNUNET_CONTAINER_MultiHashMap32 *channels;
89 * child of the next channel to create (to avoid reusing IDs often)
91 struct GNUNET_CADET_ClientChannelNumber next_ccn;
94 * Configuration given by the client, in case of reconnection
96 const struct GNUNET_CONFIGURATION_Handle *cfg;
99 * Task for trying to reconnect.
101 struct GNUNET_SCHEDULER_Task *reconnect_task;
104 * Callback for an info task (only one active at a time).
106 union CadetInfoCB info_cb;
109 * Info callback closure for @c info_cb.
114 * Time to the next reconnect in case one reconnect fails
116 struct GNUNET_TIME_Relative reconnect_time;
122 * Opaque handle to a channel.
124 struct GNUNET_CADET_Channel
128 * Other end of the channel.
130 struct GNUNET_PeerIdentity peer;
133 * Handle to the cadet this channel belongs to
135 struct GNUNET_CADET_Handle *cadet;
138 * Channel's port, if incoming.
140 struct GNUNET_CADET_Port *incoming_port;
143 * Any data the caller wants to put in here, used for the
144 * various callbacks (@e disconnects, @e window_changes, handlers).
149 * Message Queue for the channel (which we are implementing).
151 struct GNUNET_MQ_Handle *mq;
154 * Task to allow mq to send more traffic.
156 struct GNUNET_SCHEDULER_Task *mq_cont;
159 * Pending envelope with a message to be transmitted to the
160 * service as soon as we are allowed to. Should only be
161 * non-NULL if @e allow_send is 0.
163 struct GNUNET_MQ_Envelope *pending_env;
166 * Window change handler.
168 GNUNET_CADET_WindowSizeEventHandler window_changes;
171 * Disconnect handler.
173 GNUNET_CADET_DisconnectEventHandler disconnects;
176 * Local ID of the channel, #GNUNET_CADET_LOCAL_CHANNEL_ID_CLI bit is set if outbound.
178 struct GNUNET_CADET_ClientChannelNumber ccn;
181 * Channel options: reliability, etc.
183 enum GNUNET_CADET_ChannelOption options;
186 * How many messages are we allowed to send to the service right now?
188 unsigned int allow_send;
194 * Opaque handle to a port.
196 struct GNUNET_CADET_Port
202 struct GNUNET_HashCode id;
205 * Handle to the CADET session this port belongs to.
207 struct GNUNET_CADET_Handle *cadet;
210 * Callback handler for incoming channels on this port.
212 GNUNET_CADET_InboundChannelNotificationHandler *handler;
215 * Closure for @a handler.
220 * Handler for incoming channels on this port
222 GNUNET_CADET_ConnectEventHandler connects;
225 * Closure for @ref connects
230 * Window size change handler.
232 GNUNET_CADET_WindowSizeEventHandler window_changes;
235 * Handler called when an incoming channel is destroyed.
237 GNUNET_CADET_DisconnectEventHandler disconnects;
240 * Payload handlers for incoming channels.
242 struct GNUNET_MQ_MessageHandler *handlers;
247 * Find the Port struct for a hash.
249 * @param h CADET handle.
250 * @param hash HashCode for the port number.
251 * @return The port handle if known, NULL otherwise.
253 static struct GNUNET_CADET_Port *
254 find_port (const struct GNUNET_CADET_Handle *h,
255 const struct GNUNET_HashCode *hash)
257 return GNUNET_CONTAINER_multihashmap_get (h->ports,
263 * Get the channel handler for the channel specified by id from the given handle
265 * @param h Cadet handle
266 * @param ccn ID of the wanted channel
267 * @return handle to the required channel or NULL if not found
269 static struct GNUNET_CADET_Channel *
270 find_channel (struct GNUNET_CADET_Handle *h,
271 struct GNUNET_CADET_ClientChannelNumber ccn)
273 return GNUNET_CONTAINER_multihashmap32_get (h->channels,
274 ntohl (ccn.channel_of_client));
279 * Create a new channel and insert it in the channel list of the cadet handle
281 * @param h Cadet handle
282 * @param ccnp pointer to desired ccn of the channel, NULL to assign one automatically.
283 * @return Handle to the created channel.
285 static struct GNUNET_CADET_Channel *
286 create_channel (struct GNUNET_CADET_Handle *h,
287 const struct GNUNET_CADET_ClientChannelNumber *ccnp)
289 struct GNUNET_CADET_Channel *ch;
290 struct GNUNET_CADET_ClientChannelNumber ccn;
292 ch = GNUNET_new (struct GNUNET_CADET_Channel);
299 h->next_ccn.channel_of_client
300 = htonl (GNUNET_CADET_LOCAL_CHANNEL_ID_CLI | (1 + ntohl (h->next_ccn.channel_of_client)));
308 GNUNET_assert (GNUNET_OK ==
309 GNUNET_CONTAINER_multihashmap32_put (h->channels,
310 ntohl (ch->ccn.channel_of_client),
312 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
318 * Destroy the specified channel.
319 * - Destroys all peers, calling the disconnect callback on each if needed
320 * - Cancels all outgoing traffic for that channel, calling respective notifys
321 * - Calls cleaner if channel was inbound
322 * - Frees all memory used
324 * @param ch Pointer to the channel.
325 * @param call_cleaner Whether to call the cleaner handler.
328 destroy_channel (struct GNUNET_CADET_Channel *ch)
330 struct GNUNET_CADET_Handle *h = ch->cadet;
332 LOG (GNUNET_ERROR_TYPE_DEBUG,
333 "Destroying channel %X of %p\n",
336 GNUNET_assert (GNUNET_YES ==
337 GNUNET_CONTAINER_multihashmap32_remove (h->channels,
338 ntohl (ch->ccn.channel_of_client),
340 if (NULL != ch->mq_cont)
342 GNUNET_SCHEDULER_cancel (ch->mq_cont);
345 /* signal channel destruction */
346 if (NULL != ch->disconnects)
347 ch->disconnects (ch->ctx,
349 if (NULL != ch->pending_env)
350 GNUNET_MQ_discard (ch->pending_env);
351 GNUNET_MQ_destroy (ch->mq);
357 * Reconnect to the service, retransmit all infomation to try to restore the
360 * @param h handle to the cadet
363 reconnect (struct GNUNET_CADET_Handle *h);
367 * Reconnect callback: tries to reconnect again after a failer previous
370 * @param cls closure (cadet handle)
373 reconnect_cbk (void *cls)
375 struct GNUNET_CADET_Handle *h = cls;
377 h->reconnect_task = NULL;
383 * Function called during #reconnect() to destroy
384 * all channels that are still open.
386 * @param cls the `struct GNUNET_CADET_Handle`
387 * @param cid chanenl ID
388 * @param value a `struct GNUNET_CADET_Channel` to destroy
389 * @return #GNUNET_OK (continue to iterate)
392 destroy_channel_on_reconnect_cb (void *cls,
396 /* struct GNUNET_CADET_Handle *handle = cls; */
397 struct GNUNET_CADET_Channel *ch = value;
399 destroy_channel (ch);
405 * Reconnect to the service, retransmit all infomation to try to restore the
408 * @param h handle to the cadet
410 * @return #GNUNET_YES in case of sucess, #GNUNET_NO otherwise (service down...)
413 schedule_reconnect (struct GNUNET_CADET_Handle *h)
415 if (NULL != h->reconnect_task)
417 GNUNET_CONTAINER_multihashmap32_iterate (h->channels,
418 &destroy_channel_on_reconnect_cb,
421 = GNUNET_SCHEDULER_add_delayed (h->reconnect_time,
425 = GNUNET_TIME_STD_BACKOFF (h->reconnect_time);
430 * Notify the application about a change in the window size (if needed).
432 * @param ch Channel to notify about.
435 notify_window_size (struct GNUNET_CADET_Channel *ch)
437 if (NULL != ch->window_changes)
438 ch->window_changes (ch->ctx,
439 ch, /* FIXME: remove 'ch'? */
445 * Transmit the next message from our queue.
447 * @param cls Closure (channel whose mq to activate).
450 cadet_mq_send_now (void *cls)
452 struct GNUNET_CADET_Channel *ch = cls;
453 struct GNUNET_MQ_Envelope *env = ch->pending_env;
456 if (0 == ch->allow_send)
458 /* how did we get here? */
464 /* how did we get here? */
469 ch->pending_env = NULL;
470 GNUNET_MQ_send (ch->cadet->mq,
472 GNUNET_MQ_impl_send_continue (ch->mq);
477 * Implement sending functionality of a message queue for
478 * us sending messages to a peer.
480 * Encapsulates the payload message in a #GNUNET_CADET_LocalData message
481 * in order to label the message with the channel ID and send the
482 * encapsulated message to the service.
484 * @param mq the message queue
485 * @param msg the message to send
486 * @param impl_state state of the implementation
489 cadet_mq_send_impl (struct GNUNET_MQ_Handle *mq,
490 const struct GNUNET_MessageHeader *msg,
493 struct GNUNET_CADET_Channel *ch = impl_state;
494 struct GNUNET_CADET_Handle *h = ch->cadet;
496 struct GNUNET_MQ_Envelope *env;
497 struct GNUNET_CADET_LocalData *cadet_msg;
501 /* We're currently reconnecting, pretend this worked */
502 GNUNET_MQ_impl_send_continue (mq);
506 /* check message size for sanity */
507 msize = ntohs (msg->size);
508 if (msize > GNUNET_CONSTANTS_MAX_CADET_MESSAGE_SIZE)
511 GNUNET_MQ_impl_send_continue (mq);
514 env = GNUNET_MQ_msg_nested_mh (cadet_msg,
515 GNUNET_MESSAGE_TYPE_CADET_LOCAL_DATA,
517 cadet_msg->ccn = ch->ccn;
518 GNUNET_assert (NULL == ch->pending_env);
519 ch->pending_env = env;
520 if (0 < ch->allow_send)
522 = GNUNET_SCHEDULER_add_now (&cadet_mq_send_now,
528 * Handle destruction of a message queue. Implementations must not
529 * free @a mq, but should take care of @a impl_state.
531 * @param mq the message queue to destroy
532 * @param impl_state state of the implementation
535 cadet_mq_destroy_impl (struct GNUNET_MQ_Handle *mq,
538 struct GNUNET_CADET_Channel *ch = impl_state;
540 GNUNET_assert (mq == ch->mq);
546 * We had an error processing a message we forwarded from a peer to
547 * the CADET service. We should just complain about it but otherwise
548 * continue processing.
550 * @param cls closure with our `struct GNUNET_CADET_Channel`
551 * @param error error code
554 cadet_mq_error_handler (void *cls,
555 enum GNUNET_MQ_Error error)
557 struct GNUNET_CADET_Channel *ch = cls;
560 if (GNUNET_MQ_ERROR_NO_MATCH == error)
562 /* Got a message we did not understand, still try to continue! */
563 GNUNET_CADET_receive_done (ch);
567 schedule_reconnect (ch->cadet);
573 * Implementation function that cancels the currently sent message.
574 * Should basically undo whatever #mq_send_impl() did.
576 * @param mq message queue
577 * @param impl_state state specific to the implementation
580 cadet_mq_cancel_impl (struct GNUNET_MQ_Handle *mq,
583 struct GNUNET_CADET_Channel *ch = impl_state;
585 GNUNET_assert (NULL != ch->pending_env);
586 GNUNET_MQ_discard (ch->pending_env);
587 ch->pending_env = NULL;
588 if (NULL != ch->mq_cont)
590 GNUNET_SCHEDULER_cancel (ch->mq_cont);
597 * Process the new channel notification and add it to the channels in the handle
599 * @param h The cadet handle
600 * @param msg A message with the details of the new incoming channel
603 handle_channel_created (void *cls,
604 const struct GNUNET_CADET_LocalChannelCreateMessage *msg)
606 struct GNUNET_CADET_Handle *h = cls;
607 struct GNUNET_CADET_Channel *ch;
608 struct GNUNET_CADET_Port *port;
609 const struct GNUNET_HashCode *port_number;
610 struct GNUNET_CADET_ClientChannelNumber ccn;
613 port_number = &msg->port;
614 if (ntohl (ccn.channel_of_client) >= GNUNET_CADET_LOCAL_CHANNEL_ID_CLI)
623 /* We could have closed the port but the service didn't know about it yet
624 * This is not an error.
626 struct GNUNET_CADET_LocalChannelDestroyMessage *d_msg;
627 struct GNUNET_MQ_Envelope *env;
629 LOG (GNUNET_ERROR_TYPE_DEBUG,
630 "No handler for incoming channel %X (on port %s, recently closed?)\n",
631 ntohl (ccn.channel_of_client),
632 GNUNET_h2s (port_number));
633 env = GNUNET_MQ_msg (d_msg,
634 GNUNET_MESSAGE_TYPE_CADET_LOCAL_CHANNEL_DESTROY);
635 d_msg->ccn = msg->ccn;
636 GNUNET_MQ_send (h->mq,
641 ch = create_channel (h,
643 ch->peer = msg->peer;
645 ch->incoming_port = port;
646 ch->options = ntohl (msg->opt);
647 LOG (GNUNET_ERROR_TYPE_DEBUG,
648 "Creating incoming channel %X [%s] %p\n",
649 ntohl (ccn.channel_of_client),
650 GNUNET_h2s (port_number),
653 GNUNET_assert (NULL != port->connects);
654 ch->window_changes = port->window_changes;
655 ch->disconnects = port->disconnects;
656 ch->mq = GNUNET_MQ_queue_for_callbacks (&cadet_mq_send_impl,
657 &cadet_mq_destroy_impl,
658 &cadet_mq_cancel_impl,
661 &cadet_mq_error_handler,
663 ch->ctx = port->connects (port->cls,
666 GNUNET_MQ_set_handlers_closure (ch->mq,
672 * Process the channel destroy notification and free associated resources
674 * @param h The cadet handle
675 * @param msg A message with the details of the channel being destroyed
678 handle_channel_destroy (void *cls,
679 const struct GNUNET_CADET_LocalChannelDestroyMessage *msg)
681 struct GNUNET_CADET_Handle *h = cls;
682 struct GNUNET_CADET_Channel *ch;
684 ch = find_channel (h,
688 LOG (GNUNET_ERROR_TYPE_DEBUG,
689 "Received channel destroy for unknown channel %X from CADET service (recently close?)\n",
690 ntohl (msg->ccn.channel_of_client));
693 LOG (GNUNET_ERROR_TYPE_DEBUG,
694 "Received channel destroy for channel %X from CADET service\n",
695 ntohl (msg->ccn.channel_of_client));
696 destroy_channel (ch);
701 * Check that message received from CADET service is well-formed.
703 * @param cls the `struct GNUNET_CADET_Handle`
704 * @param message the message we got
705 * @return #GNUNET_OK if the message is well-formed,
706 * #GNUNET_SYSERR otherwise
709 check_local_data (void *cls,
710 const struct GNUNET_CADET_LocalData *message)
714 size = ntohs (message->header.size);
715 if (sizeof (*message) + sizeof (struct GNUNET_MessageHeader) > size)
718 return GNUNET_SYSERR;
725 * Process the incoming data packets, call appropriate handlers.
727 * @param h The cadet handle
728 * @param message A message encapsulating the data
731 handle_local_data (void *cls,
732 const struct GNUNET_CADET_LocalData *message)
734 struct GNUNET_CADET_Handle *h = cls;
735 const struct GNUNET_MessageHeader *payload;
736 struct GNUNET_CADET_Channel *ch;
740 ch = find_channel (h,
744 LOG (GNUNET_ERROR_TYPE_DEBUG,
745 "Unknown channel %X for incoming data (recently closed?)\n",
746 ntohl (message->ccn.channel_of_client));
750 payload = (const struct GNUNET_MessageHeader *) &message[1];
751 type = ntohs (payload->type);
752 fwd = ntohl (ch->ccn.channel_of_client) <= GNUNET_CADET_LOCAL_CHANNEL_ID_CLI;
753 LOG (GNUNET_ERROR_TYPE_DEBUG,
754 "Got a %s data on channel %s [%X] of type %u\n",
756 GNUNET_i2s (&ch->peer),
757 ntohl (message->ccn.channel_of_client),
759 GNUNET_MQ_inject_message (ch->mq,
765 * Process a local ACK message, enabling the client to send
766 * more data to the service.
768 * @param h Cadet handle.
769 * @param message Message itself.
772 handle_local_ack (void *cls,
773 const struct GNUNET_CADET_LocalAck *message)
775 struct GNUNET_CADET_Handle *h = cls;
776 struct GNUNET_CADET_Channel *ch;
778 ch = find_channel (h,
782 LOG (GNUNET_ERROR_TYPE_DEBUG,
783 "ACK on unknown channel %X\n",
784 ntohl (message->ccn.channel_of_client));
788 if (NULL == ch->pending_env)
790 LOG (GNUNET_ERROR_TYPE_DEBUG,
791 "Got an ACK on mq channel %X, allow send now %u!\n",
792 ntohl (ch->ccn.channel_of_client),
794 notify_window_size (ch);
797 if (NULL != ch->mq_cont)
798 return; /* already working on it! */
799 LOG (GNUNET_ERROR_TYPE_DEBUG,
800 "Got an ACK on mq channel %X, sending pending message!\n",
801 ntohl (ch->ccn.channel_of_client));
803 = GNUNET_SCHEDULER_add_now (&cadet_mq_send_now,
809 * Generic error handler, called with the appropriate error code and
810 * the same closure specified at the creation of the message queue.
811 * Not every message queue implementation supports an error handler.
813 * @param cls closure, a `struct GNUNET_CORE_Handle *`
814 * @param error error code
817 handle_mq_error (void *cls,
818 enum GNUNET_MQ_Error error)
820 struct GNUNET_CADET_Handle *h = cls;
822 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
825 GNUNET_MQ_destroy (h->mq);
832 * Process a local reply about info on all tunnels, pass info to the user.
834 * @param cls Closure (Cadet handle).
835 * @param msg Message itself.
838 handle_get_peers (void *cls,
839 const struct GNUNET_CADET_LocalInfoPeer *msg)
841 struct GNUNET_CADET_Handle *h = cls;
843 if (NULL == h->info_cb.peers_cb)
845 h->info_cb.peers_cb (h->info_cls,
847 (int) ntohs (msg->tunnel),
848 (unsigned int) ntohs (msg->paths),
854 * Check that message received from CADET service is well-formed.
856 * @param cls the `struct GNUNET_CADET_Handle`
857 * @param message the message we got
858 * @return #GNUNET_OK if the message is well-formed,
859 * #GNUNET_SYSERR otherwise
862 check_get_peer (void *cls,
863 const struct GNUNET_CADET_LocalInfoPeer *message)
865 size_t msize = sizeof (struct GNUNET_CADET_LocalInfoPeer);
866 const struct GNUNET_PeerIdentity *paths_array;
872 esize = ntohs (message->header.size);
876 return GNUNET_SYSERR;
878 if (0 != ((esize - msize) % sizeof (struct GNUNET_PeerIdentity)))
881 return GNUNET_SYSERR;
883 peers = (esize - msize) / sizeof (struct GNUNET_PeerIdentity);
884 epaths = ntohs (message->paths);
885 paths_array = (const struct GNUNET_PeerIdentity *) &message[1];
887 for (unsigned int i = 0; i < peers; i++)
888 if (0 == memcmp (&paths_array[i],
889 &message->destination,
890 sizeof (struct GNUNET_PeerIdentity)))
895 return GNUNET_SYSERR;
902 * Process a local peer info reply, pass info to the user.
904 * @param cls Closure (Cadet handle).
905 * @param message Message itself.
908 handle_get_peer (void *cls,
909 const struct GNUNET_CADET_LocalInfoPeer *message)
911 struct GNUNET_CADET_Handle *h = cls;
912 const struct GNUNET_PeerIdentity *paths_array;
914 unsigned int path_length;
918 if (NULL == h->info_cb.peer_cb)
920 paths = ntohs (message->paths);
921 paths_array = (const struct GNUNET_PeerIdentity *) &message[1];
922 peers = (ntohs (message->header.size) - sizeof (*message))
923 / sizeof (struct GNUNET_PeerIdentity);
925 neighbor = GNUNET_NO;
927 for (unsigned int i = 0; i < peers; i++)
929 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
931 GNUNET_i2s (&paths_array[i]));
933 if (0 == memcmp (&paths_array[i], &message->destination,
934 sizeof (struct GNUNET_PeerIdentity)))
936 if (1 == path_length)
937 neighbor = GNUNET_YES;
942 /* Call Callback with tunnel info. */
943 paths_array = (const struct GNUNET_PeerIdentity *) &message[1];
944 h->info_cb.peer_cb (h->info_cls,
945 &message->destination,
946 (int) ntohs (message->tunnel),
954 * Process a local reply about info on all tunnels, pass info to the user.
956 * @param cls Closure (Cadet handle).
957 * @param message Message itself.
960 handle_get_tunnels (void *cls,
961 const struct GNUNET_CADET_LocalInfoTunnel *msg)
963 struct GNUNET_CADET_Handle *h = cls;
965 if (NULL == h->info_cb.tunnels_cb)
967 h->info_cb.tunnels_cb (h->info_cls,
969 ntohl (msg->channels),
970 ntohl (msg->connections),
972 ntohs (msg->cstate));
978 * Check that message received from CADET service is well-formed.
980 * @param cls the `struct GNUNET_CADET_Handle`
981 * @param msg the message we got
982 * @return #GNUNET_OK if the message is well-formed,
983 * #GNUNET_SYSERR otherwise
986 check_get_tunnel (void *cls,
987 const struct GNUNET_CADET_LocalInfoTunnel *msg)
994 /* Verify message sanity */
995 msize = ntohs (msg->header.size);
996 esize = sizeof (struct GNUNET_CADET_LocalInfoTunnel);
1000 return GNUNET_SYSERR;
1002 ch_n = ntohl (msg->channels);
1003 c_n = ntohl (msg->connections);
1004 esize += ch_n * sizeof (struct GNUNET_CADET_ChannelTunnelNumber);
1005 esize += c_n * sizeof (struct GNUNET_CADET_ConnectionTunnelIdentifier);
1008 GNUNET_break_op (0);
1009 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1010 "m:%u, e: %u (%u ch, %u conn)\n",
1011 (unsigned int) msize,
1012 (unsigned int) esize,
1015 return GNUNET_SYSERR;
1022 * Process a local tunnel info reply, pass info to the user.
1024 * @param cls Closure (Cadet handle).
1025 * @param msg Message itself.
1028 handle_get_tunnel (void *cls,
1029 const struct GNUNET_CADET_LocalInfoTunnel *msg)
1031 struct GNUNET_CADET_Handle *h = cls;
1034 const struct GNUNET_CADET_ConnectionTunnelIdentifier *conns;
1035 const struct GNUNET_CADET_ChannelTunnelNumber *chns;
1037 if (NULL == h->info_cb.tunnel_cb)
1040 ch_n = ntohl (msg->channels);
1041 c_n = ntohl (msg->connections);
1043 /* Call Callback with tunnel info. */
1044 conns = (const struct GNUNET_CADET_ConnectionTunnelIdentifier *) &msg[1];
1045 chns = (const struct GNUNET_CADET_ChannelTunnelNumber *) &conns[c_n];
1046 h->info_cb.tunnel_cb (h->info_cls,
1052 ntohs (msg->estate),
1053 ntohs (msg->cstate));
1058 * Reconnect to the service, retransmit all infomation to try to restore the
1061 * @param h handle to the cadet
1064 reconnect (struct GNUNET_CADET_Handle *h)
1066 struct GNUNET_MQ_MessageHandler handlers[] = {
1067 GNUNET_MQ_hd_fixed_size (channel_created,
1068 GNUNET_MESSAGE_TYPE_CADET_LOCAL_CHANNEL_CREATE,
1069 struct GNUNET_CADET_LocalChannelCreateMessage,
1071 GNUNET_MQ_hd_fixed_size (channel_destroy,
1072 GNUNET_MESSAGE_TYPE_CADET_LOCAL_CHANNEL_DESTROY,
1073 struct GNUNET_CADET_LocalChannelDestroyMessage,
1075 GNUNET_MQ_hd_var_size (local_data,
1076 GNUNET_MESSAGE_TYPE_CADET_LOCAL_DATA,
1077 struct GNUNET_CADET_LocalData,
1079 GNUNET_MQ_hd_fixed_size (local_ack,
1080 GNUNET_MESSAGE_TYPE_CADET_LOCAL_ACK,
1081 struct GNUNET_CADET_LocalAck,
1083 GNUNET_MQ_hd_fixed_size (get_peers,
1084 GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_PEERS,
1085 struct GNUNET_CADET_LocalInfoPeer,
1087 GNUNET_MQ_hd_var_size (get_peer,
1088 GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_PEER,
1089 struct GNUNET_CADET_LocalInfoPeer,
1091 GNUNET_MQ_hd_fixed_size (get_tunnels,
1092 GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_TUNNELS,
1093 struct GNUNET_CADET_LocalInfoTunnel,
1095 GNUNET_MQ_hd_var_size (get_tunnel,
1096 GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_TUNNEL,
1097 struct GNUNET_CADET_LocalInfoTunnel,
1099 GNUNET_MQ_handler_end ()
1102 h->mq = GNUNET_CLIENT_connect (h->cfg,
1109 schedule_reconnect (h);
1112 h->reconnect_time = GNUNET_TIME_UNIT_MILLISECONDS;
1117 * Function called during #GNUNET_CADET_disconnect() to destroy
1118 * all channels that are still open.
1120 * @param cls the `struct GNUNET_CADET_Handle`
1121 * @param cid chanenl ID
1122 * @param value a `struct GNUNET_CADET_Channel` to destroy
1123 * @return #GNUNET_OK (continue to iterate)
1126 destroy_channel_cb (void *cls,
1130 /* struct GNUNET_CADET_Handle *handle = cls; */
1131 struct GNUNET_CADET_Channel *ch = value;
1133 if (ntohl (ch->ccn.channel_of_client) >= GNUNET_CADET_LOCAL_CHANNEL_ID_CLI)
1136 LOG (GNUNET_ERROR_TYPE_DEBUG,
1137 "channel %X not destroyed\n",
1138 ntohl (ch->ccn.channel_of_client));
1140 destroy_channel (ch);
1146 * Function called during #GNUNET_CADET_disconnect() to destroy
1147 * all ports that are still open.
1149 * @param cls the `struct GNUNET_CADET_Handle`
1151 * @param value a `struct GNUNET_CADET_Channel` to destroy
1152 * @return #GNUNET_OK (continue to iterate)
1155 destroy_port_cb (void *cls,
1156 const struct GNUNET_HashCode *id,
1159 /* struct GNUNET_CADET_Handle *handle = cls; */
1160 struct GNUNET_CADET_Port *port = value;
1162 /* This is a warning, the app should have cleanly closed all open ports */
1164 GNUNET_CADET_close_port (port);
1170 * Disconnect from the cadet service. All channels will be destroyed. All channel
1171 * disconnect callbacks will be called on any still connected peers, notifying
1172 * about their disconnection. The registered inbound channel cleaner will be
1173 * called should any inbound channels still exist.
1175 * @param handle connection to cadet to disconnect
1178 GNUNET_CADET_disconnect (struct GNUNET_CADET_Handle *handle)
1180 GNUNET_CONTAINER_multihashmap_iterate (handle->ports,
1183 GNUNET_CONTAINER_multihashmap_destroy (handle->ports);
1184 handle->ports = NULL;
1185 GNUNET_CONTAINER_multihashmap32_iterate (handle->channels,
1186 &destroy_channel_cb,
1188 GNUNET_CONTAINER_multihashmap32_destroy (handle->channels);
1189 handle->channels = NULL;
1190 if (NULL != handle->mq)
1192 GNUNET_MQ_destroy (handle->mq);
1195 if (NULL != handle->reconnect_task)
1197 GNUNET_SCHEDULER_cancel (handle->reconnect_task);
1198 handle->reconnect_task = NULL;
1200 GNUNET_free (handle);
1205 * Close a port opened with @a GNUNET_CADET_open_port().
1206 * The @a new_channel callback will no longer be called.
1208 * @param p Port handle.
1211 GNUNET_CADET_close_port (struct GNUNET_CADET_Port *p)
1213 struct GNUNET_CADET_PortMessage *msg;
1214 struct GNUNET_MQ_Envelope *env;
1216 env = GNUNET_MQ_msg (msg,
1217 GNUNET_MESSAGE_TYPE_CADET_LOCAL_PORT_CLOSE);
1219 GNUNET_MQ_send (p->cadet->mq,
1221 GNUNET_assert (GNUNET_YES ==
1222 GNUNET_CONTAINER_multihashmap_remove (p->cadet->ports,
1225 GNUNET_free_non_null (p->handlers);
1231 * Destroy an existing channel.
1233 * The existing end callback for the channel will be called immediately.
1234 * Any pending outgoing messages will be sent but no incoming messages will be
1235 * accepted and no data callbacks will be called.
1237 * @param channel Channel handle, becomes invalid after this call.
1240 GNUNET_CADET_channel_destroy (struct GNUNET_CADET_Channel *channel)
1242 struct GNUNET_CADET_Handle *h = channel->cadet;
1243 struct GNUNET_CADET_LocalChannelDestroyMessage *msg;
1244 struct GNUNET_MQ_Envelope *env;
1248 env = GNUNET_MQ_msg (msg,
1249 GNUNET_MESSAGE_TYPE_CADET_LOCAL_CHANNEL_DESTROY);
1250 msg->ccn = channel->ccn;
1251 GNUNET_MQ_send (h->mq,
1254 destroy_channel (channel);
1259 * Get information about a channel.
1261 * @param channel Channel handle.
1262 * @param option Query (GNUNET_CADET_OPTION_*).
1263 * @param ... dependant on option, currently not used
1265 * @return Union with an answer to the query.
1267 const union GNUNET_CADET_ChannelInfo *
1268 GNUNET_CADET_channel_get_info (struct GNUNET_CADET_Channel *channel,
1269 enum GNUNET_CADET_ChannelOption option,
1272 static int bool_flag;
1276 case GNUNET_CADET_OPTION_NOBUFFER:
1277 case GNUNET_CADET_OPTION_RELIABLE:
1278 case GNUNET_CADET_OPTION_OUT_OF_ORDER:
1279 if (0 != (option & channel->options))
1280 bool_flag = GNUNET_YES;
1282 bool_flag = GNUNET_NO;
1283 return (const union GNUNET_CADET_ChannelInfo *) &bool_flag;
1285 case GNUNET_CADET_OPTION_PEER:
1286 return (const union GNUNET_CADET_ChannelInfo *) &channel->peer;
1296 * Send an ack on the channel to confirm the processing of a message.
1298 * @param ch Channel on which to send the ACK.
1301 GNUNET_CADET_receive_done (struct GNUNET_CADET_Channel *channel)
1303 struct GNUNET_CADET_LocalAck *msg;
1304 struct GNUNET_MQ_Envelope *env;
1306 env = GNUNET_MQ_msg (msg,
1307 GNUNET_MESSAGE_TYPE_CADET_LOCAL_ACK);
1308 LOG (GNUNET_ERROR_TYPE_DEBUG,
1309 "Sending ACK on channel %X\n",
1310 ntohl (channel->ccn.channel_of_client));
1311 msg->ccn = channel->ccn;
1312 GNUNET_MQ_send (channel->cadet->mq,
1318 * Send message of @a type to CADET service of @a h
1320 * @param h handle to CADET service
1321 * @param type message type of trivial information request to send
1324 send_info_request (struct GNUNET_CADET_Handle *h,
1327 struct GNUNET_MessageHeader *msg;
1328 struct GNUNET_MQ_Envelope *env;
1330 env = GNUNET_MQ_msg (msg,
1332 GNUNET_MQ_send (h->mq,
1338 * Request a debug dump on the service's STDERR.
1340 * WARNING: unstable API, likely to change in the future!
1342 * @param h cadet handle
1345 GNUNET_CADET_request_dump (struct GNUNET_CADET_Handle *h)
1347 send_info_request (h,
1348 GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_DUMP);
1353 * Request information about peers known to the running cadet service.
1354 * The callback will be called for every peer known to the service.
1355 * Only one info request (of any kind) can be active at once.
1357 * WARNING: unstable API, likely to change in the future!
1359 * @param h Handle to the cadet peer.
1360 * @param callback Function to call with the requested data.
1361 * @param callback_cls Closure for @c callback.
1362 * @return #GNUNET_OK / #GNUNET_SYSERR
1365 GNUNET_CADET_get_peers (struct GNUNET_CADET_Handle *h,
1366 GNUNET_CADET_PeersCB callback,
1369 if (NULL != h->info_cb.peers_cb)
1372 return GNUNET_SYSERR;
1374 send_info_request (h,
1375 GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_PEERS);
1376 h->info_cb.peers_cb = callback;
1377 h->info_cls = callback_cls;
1383 * Cancel a peer info request. The callback will not be called (anymore).
1385 * WARNING: unstable API, likely to change in the future!
1387 * @param h Cadet handle.
1388 * @return Closure given to GNUNET_CADET_get_peers().
1391 GNUNET_CADET_get_peers_cancel (struct GNUNET_CADET_Handle *h)
1393 void *cls = h->info_cls;
1395 h->info_cb.peers_cb = NULL;
1402 * Request information about a peer known to the running cadet peer.
1403 * The callback will be called for the tunnel once.
1404 * Only one info request (of any kind) can be active at once.
1406 * WARNING: unstable API, likely to change in the future!
1408 * @param h Handle to the cadet peer.
1409 * @param id Peer whose tunnel to examine.
1410 * @param callback Function to call with the requested data.
1411 * @param callback_cls Closure for @c callback.
1412 * @return #GNUNET_OK / #GNUNET_SYSERR
1415 GNUNET_CADET_get_peer (struct GNUNET_CADET_Handle *h,
1416 const struct GNUNET_PeerIdentity *id,
1417 GNUNET_CADET_PeerCB callback,
1420 struct GNUNET_CADET_LocalInfo *msg;
1421 struct GNUNET_MQ_Envelope *env;
1423 if (NULL != h->info_cb.peer_cb)
1426 return GNUNET_SYSERR;
1428 env = GNUNET_MQ_msg (msg,
1429 GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_PEER);
1431 GNUNET_MQ_send (h->mq,
1433 h->info_cb.peer_cb = callback;
1434 h->info_cls = callback_cls;
1440 * Request information about tunnels of the running cadet peer.
1441 * The callback will be called for every tunnel of the service.
1442 * Only one info request (of any kind) can be active at once.
1444 * WARNING: unstable API, likely to change in the future!
1446 * @param h Handle to the cadet peer.
1447 * @param callback Function to call with the requested data.
1448 * @param callback_cls Closure for @c callback.
1449 * @return #GNUNET_OK / #GNUNET_SYSERR
1452 GNUNET_CADET_get_tunnels (struct GNUNET_CADET_Handle *h,
1453 GNUNET_CADET_TunnelsCB callback,
1456 if (NULL != h->info_cb.tunnels_cb)
1459 return GNUNET_SYSERR;
1461 send_info_request (h,
1462 GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_TUNNELS);
1463 h->info_cb.tunnels_cb = callback;
1464 h->info_cls = callback_cls;
1470 * Cancel a monitor request. The monitor callback will not be called.
1472 * @param h Cadet handle.
1473 * @return Closure given to GNUNET_CADET_get_tunnels().
1476 GNUNET_CADET_get_tunnels_cancel (struct GNUNET_CADET_Handle *h)
1478 void *cls = h->info_cls;
1480 h->info_cb.tunnels_cb = NULL;
1487 * Request information about a tunnel of the running cadet peer.
1488 * The callback will be called for the tunnel once.
1489 * Only one info request (of any kind) can be active at once.
1491 * WARNING: unstable API, likely to change in the future!
1493 * @param h Handle to the cadet peer.
1494 * @param id Peer whose tunnel to examine.
1495 * @param callback Function to call with the requested data.
1496 * @param callback_cls Closure for @c callback.
1497 * @return #GNUNET_OK / #GNUNET_SYSERR
1500 GNUNET_CADET_get_tunnel (struct GNUNET_CADET_Handle *h,
1501 const struct GNUNET_PeerIdentity *id,
1502 GNUNET_CADET_TunnelCB callback,
1505 struct GNUNET_CADET_LocalInfo *msg;
1506 struct GNUNET_MQ_Envelope *env;
1508 if (NULL != h->info_cb.tunnel_cb)
1511 return GNUNET_SYSERR;
1513 env = GNUNET_MQ_msg (msg,
1514 GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_TUNNEL);
1516 GNUNET_MQ_send (h->mq,
1518 h->info_cb.tunnel_cb = callback;
1519 h->info_cls = callback_cls;
1525 * Transitional function to convert an unsigned int port to a hash value.
1526 * WARNING: local static value returned, NOT reentrant!
1527 * WARNING: do not use this function for new code!
1529 * @param port Numerical port (unsigned int format).
1531 * @return A GNUNET_HashCode usable for the new CADET API.
1533 const struct GNUNET_HashCode *
1534 GC_u2h (uint32_t port)
1536 static struct GNUNET_HashCode hash;
1538 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1539 "This is a transitional function, use proper crypto hashes as CADET ports\n");
1540 GNUNET_CRYPTO_hash (&port,
1548 * Connect to the MQ-based cadet service.
1550 * @param cfg Configuration to use.
1552 * @return Handle to the cadet service NULL on error.
1554 struct GNUNET_CADET_Handle *
1555 GNUNET_CADET_connecT (const struct GNUNET_CONFIGURATION_Handle *cfg)
1557 struct GNUNET_CADET_Handle *h;
1559 LOG (GNUNET_ERROR_TYPE_DEBUG,
1560 "GNUNET_CADET_connecT()\n");
1561 h = GNUNET_new (struct GNUNET_CADET_Handle);
1563 h->ports = GNUNET_CONTAINER_multihashmap_create (4,
1565 h->channels = GNUNET_CONTAINER_multihashmap32_create (4);
1570 GNUNET_CADET_disconnect (h);
1573 h->next_ccn.channel_of_client = htonl (GNUNET_CADET_LOCAL_CHANNEL_ID_CLI);
1574 h->reconnect_time = GNUNET_TIME_UNIT_MILLISECONDS;
1575 h->reconnect_task = NULL;
1582 * Open a port to receive incomming MQ-based channels.
1584 * @param h CADET handle.
1585 * @param port Hash identifying the port.
1586 * @param connects Function called when an incoming channel is connected.
1587 * @param connects_cls Closure for the @a connects handler.
1588 * @param window_changes Function called when the transmit window size changes.
1589 * @param disconnects Function called when a channel is disconnected.
1590 * @param handlers Callbacks for messages we care about, NULL-terminated.
1591 * @return Port handle.
1593 struct GNUNET_CADET_Port *
1594 GNUNET_CADET_open_porT (struct GNUNET_CADET_Handle *h,
1595 const struct GNUNET_HashCode *port,
1596 GNUNET_CADET_ConnectEventHandler connects,
1597 void * connects_cls,
1598 GNUNET_CADET_WindowSizeEventHandler window_changes,
1599 GNUNET_CADET_DisconnectEventHandler disconnects,
1600 const struct GNUNET_MQ_MessageHandler *handlers)
1602 struct GNUNET_CADET_PortMessage *msg;
1603 struct GNUNET_MQ_Envelope *env;
1604 struct GNUNET_CADET_Port *p;
1606 GNUNET_assert (NULL != connects);
1607 GNUNET_assert (NULL != disconnects);
1609 p = GNUNET_new (struct GNUNET_CADET_Port);
1612 p->connects = connects;
1613 p->cls = connects_cls;
1614 p->window_changes = window_changes;
1615 p->disconnects = disconnects;
1616 p->handlers = GNUNET_MQ_copy_handlers (handlers);
1618 GNUNET_assert (GNUNET_OK ==
1619 GNUNET_CONTAINER_multihashmap_put (h->ports,
1622 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
1624 env = GNUNET_MQ_msg (msg,
1625 GNUNET_MESSAGE_TYPE_CADET_LOCAL_PORT_OPEN);
1627 GNUNET_MQ_send (h->mq,
1634 * Create a new channel towards a remote peer.
1636 * If the destination port is not open by any peer or the destination peer
1637 * does not accept the channel, #GNUNET_CADET_ChannelEndHandler will be called
1640 * @param h CADET handle.
1641 * @param channel_cls Closure for the channel. It's given to:
1642 * - The disconnect handler @a disconnects
1643 * - Each message type callback in @a handlers
1644 * @param destination Peer identity the channel should go to.
1645 * @param port Identification of the destination port.
1646 * @param options CadetOption flag field, with all desired option bits set to 1.
1647 * @param window_changes Function called when the transmit window size changes.
1648 * @param disconnects Function called when the channel is disconnected.
1649 * @param handlers Callbacks for messages we care about, NULL-terminated.
1650 * @return Handle to the channel.
1652 struct GNUNET_CADET_Channel *
1653 GNUNET_CADET_channel_creatE (struct GNUNET_CADET_Handle *h,
1655 const struct GNUNET_PeerIdentity *destination,
1656 const struct GNUNET_HashCode *port,
1657 enum GNUNET_CADET_ChannelOption options,
1658 GNUNET_CADET_WindowSizeEventHandler window_changes,
1659 GNUNET_CADET_DisconnectEventHandler disconnects,
1660 const struct GNUNET_MQ_MessageHandler *handlers)
1662 struct GNUNET_CADET_Channel *ch;
1663 struct GNUNET_CADET_LocalChannelCreateMessage *msg;
1664 struct GNUNET_MQ_Envelope *env;
1666 GNUNET_assert (NULL != disconnects);
1667 ch = create_channel (h,
1669 ch->ctx = channel_cls;
1670 ch->peer = *destination;
1671 ch->options = options;
1672 ch->window_changes = window_changes;
1673 ch->disconnects = disconnects;
1675 /* Create MQ for channel */
1676 ch->mq = GNUNET_MQ_queue_for_callbacks (&cadet_mq_send_impl,
1677 &cadet_mq_destroy_impl,
1678 &cadet_mq_cancel_impl,
1681 &cadet_mq_error_handler,
1683 GNUNET_MQ_set_handlers_closure (ch->mq, channel_cls);
1685 /* Request channel creation to service */
1686 env = GNUNET_MQ_msg (msg,
1687 GNUNET_MESSAGE_TYPE_CADET_LOCAL_CHANNEL_CREATE);
1690 msg->peer = *destination;
1691 msg->opt = htonl (options);
1692 GNUNET_MQ_send (h->mq,
1699 * Obtain the message queue for a connected peer.
1701 * @param channel The channel handle from which to get the MQ.
1703 * @return NULL if @a channel is not yet connected.
1705 struct GNUNET_MQ_Handle *
1706 GNUNET_CADET_get_mq (const struct GNUNET_CADET_Channel *channel)
1711 /* end of cadet_api.c */