2 This file is part of GNUnet.
3 Copyright (C) 2011, 2017 GNUnet e.V.
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.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18 Boston, MA 02110-1301, USA.
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 * Closure for @a handler.
215 * Handler for incoming channels on this port
217 GNUNET_CADET_ConnectEventHandler connects;
220 * Closure for @ref connects
225 * Window size change handler.
227 GNUNET_CADET_WindowSizeEventHandler window_changes;
230 * Handler called when an incoming channel is destroyed.
232 GNUNET_CADET_DisconnectEventHandler disconnects;
235 * Payload handlers for incoming channels.
237 struct GNUNET_MQ_MessageHandler *handlers;
242 * Find the Port struct for a hash.
244 * @param h CADET handle.
245 * @param hash HashCode for the port number.
246 * @return The port handle if known, NULL otherwise.
248 static struct GNUNET_CADET_Port *
249 find_port (const struct GNUNET_CADET_Handle *h,
250 const struct GNUNET_HashCode *hash)
252 return GNUNET_CONTAINER_multihashmap_get (h->ports,
258 * Get the channel handler for the channel specified by id from the given handle
260 * @param h Cadet handle
261 * @param ccn ID of the wanted channel
262 * @return handle to the required channel or NULL if not found
264 static struct GNUNET_CADET_Channel *
265 find_channel (struct GNUNET_CADET_Handle *h,
266 struct GNUNET_CADET_ClientChannelNumber ccn)
268 return GNUNET_CONTAINER_multihashmap32_get (h->channels,
269 ntohl (ccn.channel_of_client));
274 * Create a new channel and insert it in the channel list of the cadet handle
276 * @param h Cadet handle
277 * @param ccnp pointer to desired ccn of the channel, NULL to assign one automatically.
278 * @return Handle to the created channel.
280 static struct GNUNET_CADET_Channel *
281 create_channel (struct GNUNET_CADET_Handle *h,
282 const struct GNUNET_CADET_ClientChannelNumber *ccnp)
284 struct GNUNET_CADET_Channel *ch;
285 struct GNUNET_CADET_ClientChannelNumber ccn;
287 ch = GNUNET_new (struct GNUNET_CADET_Channel);
294 h->next_ccn.channel_of_client
295 = htonl (GNUNET_CADET_LOCAL_CHANNEL_ID_CLI | (1 + ntohl (h->next_ccn.channel_of_client)));
303 GNUNET_assert (GNUNET_OK ==
304 GNUNET_CONTAINER_multihashmap32_put (h->channels,
305 ntohl (ch->ccn.channel_of_client),
307 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
313 * Destroy the specified channel.
314 * - Destroys all peers, calling the disconnect callback on each if needed
315 * - Cancels all outgoing traffic for that channel, calling respective notifys
316 * - Calls cleaner if channel was inbound
317 * - Frees all memory used
319 * @param ch Pointer to the channel.
320 * @param call_cleaner Whether to call the cleaner handler.
323 destroy_channel (struct GNUNET_CADET_Channel *ch)
325 struct GNUNET_CADET_Handle *h = ch->cadet;
327 LOG (GNUNET_ERROR_TYPE_DEBUG,
328 "Destroying channel %X of %p\n",
329 htonl (ch->ccn.channel_of_client),
331 GNUNET_assert (GNUNET_YES ==
332 GNUNET_CONTAINER_multihashmap32_remove (h->channels,
333 ntohl (ch->ccn.channel_of_client),
335 if (NULL != ch->mq_cont)
337 GNUNET_SCHEDULER_cancel (ch->mq_cont);
340 /* signal channel destruction */
341 if (NULL != ch->disconnects)
342 ch->disconnects (ch->ctx,
344 if (NULL != ch->pending_env)
345 GNUNET_MQ_discard (ch->pending_env);
346 GNUNET_MQ_destroy (ch->mq);
352 * Reconnect to the service, retransmit all infomation to try to restore the
355 * @param h handle to the cadet
358 reconnect (struct GNUNET_CADET_Handle *h);
362 * Reconnect callback: tries to reconnect again after a failer previous
365 * @param cls closure (cadet handle)
368 reconnect_cbk (void *cls)
370 struct GNUNET_CADET_Handle *h = cls;
372 h->reconnect_task = NULL;
378 * Function called during #reconnect() to destroy
379 * all channels that are still open.
381 * @param cls the `struct GNUNET_CADET_Handle`
382 * @param cid chanenl ID
383 * @param value a `struct GNUNET_CADET_Channel` to destroy
384 * @return #GNUNET_OK (continue to iterate)
387 destroy_channel_on_reconnect_cb (void *cls,
391 /* struct GNUNET_CADET_Handle *handle = cls; */
392 struct GNUNET_CADET_Channel *ch = value;
394 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
395 "Destroying channel due to reconnect\n");
396 destroy_channel (ch);
402 * Reconnect to the service, retransmit all infomation to try to restore the
405 * @param h handle to the cadet
407 * @return #GNUNET_YES in case of sucess, #GNUNET_NO otherwise (service down...)
410 schedule_reconnect (struct GNUNET_CADET_Handle *h)
412 if (NULL != h->reconnect_task)
414 GNUNET_CONTAINER_multihashmap32_iterate (h->channels,
415 &destroy_channel_on_reconnect_cb,
418 = GNUNET_SCHEDULER_add_delayed (h->reconnect_time,
422 = GNUNET_TIME_STD_BACKOFF (h->reconnect_time);
427 * Notify the application about a change in the window size (if needed).
429 * @param ch Channel to notify about.
432 notify_window_size (struct GNUNET_CADET_Channel *ch)
434 if (NULL != ch->window_changes)
435 ch->window_changes (ch->ctx,
436 ch, /* FIXME: remove 'ch'? */
442 * Transmit the next message from our queue.
444 * @param cls Closure (channel whose mq to activate).
447 cadet_mq_send_now (void *cls)
449 struct GNUNET_CADET_Channel *ch = cls;
450 struct GNUNET_MQ_Envelope *env = ch->pending_env;
453 if (0 == ch->allow_send)
455 /* how did we get here? */
461 /* how did we get here? */
466 ch->pending_env = NULL;
467 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
468 "Sending message on channel %s to CADET, new window size is %u\n",
469 GNUNET_i2s (&ch->peer),
471 GNUNET_MQ_send (ch->cadet->mq,
473 GNUNET_MQ_impl_send_continue (ch->mq);
478 * Implement sending functionality of a message queue for
479 * us sending messages to a peer.
481 * Encapsulates the payload message in a #GNUNET_CADET_LocalData message
482 * in order to label the message with the channel ID and send the
483 * encapsulated message to the service.
485 * @param mq the message queue
486 * @param msg the message to send
487 * @param impl_state state of the implementation
490 cadet_mq_send_impl (struct GNUNET_MQ_Handle *mq,
491 const struct GNUNET_MessageHeader *msg,
494 struct GNUNET_CADET_Channel *ch = impl_state;
495 struct GNUNET_CADET_Handle *h = ch->cadet;
497 struct GNUNET_MQ_Envelope *env;
498 struct GNUNET_CADET_LocalData *cadet_msg = NULL;
502 /* We're currently reconnecting, pretend this worked */
503 GNUNET_MQ_impl_send_continue (mq);
507 /* check message size for sanity */
508 msize = ntohs (msg->size);
509 if (msize > GNUNET_CONSTANTS_MAX_CADET_MESSAGE_SIZE)
512 GNUNET_MQ_impl_send_continue (mq);
515 env = GNUNET_MQ_msg_nested_mh (cadet_msg,
516 GNUNET_MESSAGE_TYPE_CADET_LOCAL_DATA,
518 cadet_msg->ccn = ch->ccn;
519 GNUNET_assert (NULL == ch->pending_env);
520 ch->pending_env = env;
521 if (0 < ch->allow_send)
523 = GNUNET_SCHEDULER_add_now (&cadet_mq_send_now,
529 * Handle destruction of a message queue. Implementations must not
530 * free @a mq, but should take care of @a impl_state.
532 * @param mq the message queue to destroy
533 * @param impl_state state of the implementation
536 cadet_mq_destroy_impl (struct GNUNET_MQ_Handle *mq,
539 struct GNUNET_CADET_Channel *ch = impl_state;
541 GNUNET_assert (mq == ch->mq);
547 * We had an error processing a message we forwarded from a peer to
548 * the CADET service. We should just complain about it but otherwise
549 * continue processing.
551 * @param cls closure with our `struct GNUNET_CADET_Channel`
552 * @param error error code
555 cadet_mq_error_handler (void *cls,
556 enum GNUNET_MQ_Error error)
558 struct GNUNET_CADET_Channel *ch = cls;
561 if (GNUNET_MQ_ERROR_NO_MATCH == error)
563 /* Got a message we did not understand, still try to continue! */
564 GNUNET_CADET_receive_done (ch);
568 schedule_reconnect (ch->cadet);
574 * Implementation function that cancels the currently sent message.
575 * Should basically undo whatever #mq_send_impl() did.
577 * @param mq message queue
578 * @param impl_state state specific to the implementation
581 cadet_mq_cancel_impl (struct GNUNET_MQ_Handle *mq,
584 struct GNUNET_CADET_Channel *ch = impl_state;
586 GNUNET_assert (NULL != ch->pending_env);
587 GNUNET_MQ_discard (ch->pending_env);
588 ch->pending_env = NULL;
589 if (NULL != ch->mq_cont)
591 GNUNET_SCHEDULER_cancel (ch->mq_cont);
598 * Process the new channel notification and add it to the channels in the handle
600 * @param h The cadet handle
601 * @param msg A message with the details of the new incoming channel
604 handle_channel_created (void *cls,
605 const struct GNUNET_CADET_LocalChannelCreateMessage *msg)
607 struct GNUNET_CADET_Handle *h = cls;
608 struct GNUNET_CADET_Channel *ch;
609 struct GNUNET_CADET_Port *port;
610 const struct GNUNET_HashCode *port_number;
611 struct GNUNET_CADET_ClientChannelNumber ccn;
614 port_number = &msg->port;
615 if (ntohl (ccn.channel_of_client) >= GNUNET_CADET_LOCAL_CHANNEL_ID_CLI)
624 /* We could have closed the port but the service didn't know about it yet
625 * This is not an error.
627 struct GNUNET_CADET_LocalChannelDestroyMessage *d_msg;
628 struct GNUNET_MQ_Envelope *env;
630 LOG (GNUNET_ERROR_TYPE_DEBUG,
631 "No handler for incoming channel %X (on port %s, recently closed?)\n",
632 ntohl (ccn.channel_of_client),
633 GNUNET_h2s (port_number));
634 env = GNUNET_MQ_msg (d_msg,
635 GNUNET_MESSAGE_TYPE_CADET_LOCAL_CHANNEL_DESTROY);
636 d_msg->ccn = msg->ccn;
637 GNUNET_MQ_send (h->mq,
642 ch = create_channel (h,
644 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 LOG (GNUNET_ERROR_TYPE_DEBUG,
789 "Got an ACK on mq channel %X (peer %s); new window size is %u!\n",
790 ntohl (ch->ccn.channel_of_client),
791 GNUNET_i2s (&ch->peer),
793 if (NULL == ch->pending_env)
795 LOG (GNUNET_ERROR_TYPE_DEBUG,
796 "Got an ACK on mq channel %X, allow send now %u!\n",
797 ntohl (ch->ccn.channel_of_client),
799 notify_window_size (ch);
802 if (NULL != ch->mq_cont)
803 return; /* already working on it! */
805 = GNUNET_SCHEDULER_add_now (&cadet_mq_send_now,
811 * Generic error handler, called with the appropriate error code and
812 * the same closure specified at the creation of the message queue.
813 * Not every message queue implementation supports an error handler.
815 * @param cls closure, a `struct GNUNET_CORE_Handle *`
816 * @param error error code
819 handle_mq_error (void *cls,
820 enum GNUNET_MQ_Error error)
822 struct GNUNET_CADET_Handle *h = cls;
824 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
827 GNUNET_MQ_destroy (h->mq);
834 * Check that message received from CADET service is well-formed.
836 * @param cls the `struct GNUNET_CADET_Handle`
837 * @param message the message we got
838 * @return #GNUNET_OK if the message is well-formed,
839 * #GNUNET_SYSERR otherwise
842 check_get_peers (void *cls,
843 const struct GNUNET_MessageHeader *message)
847 esize = ntohs (message->size);
848 if (sizeof (struct GNUNET_CADET_LocalInfoPeer) == esize)
850 if (sizeof (struct GNUNET_MessageHeader) == esize)
852 return GNUNET_SYSERR;
857 * Process a local reply about info on all tunnels, pass info to the user.
859 * @param cls Closure (Cadet handle).
860 * @param msg Message itself.
863 handle_get_peers (void *cls,
864 const struct GNUNET_MessageHeader *msg)
866 struct GNUNET_CADET_Handle *h = cls;
867 const struct GNUNET_CADET_LocalInfoPeer *info =
868 (const struct GNUNET_CADET_LocalInfoPeer *) msg;
870 if (NULL == h->info_cb.peers_cb)
872 if (sizeof (struct GNUNET_CADET_LocalInfoPeer) == ntohs (msg->size))
873 h->info_cb.peers_cb (h->info_cls,
875 (int) ntohs (info->tunnel),
876 (unsigned int) ntohs (info->paths),
879 h->info_cb.peers_cb (h->info_cls,
888 * Check that message received from CADET service is well-formed.
890 * @param cls the `struct GNUNET_CADET_Handle`
891 * @param message the message we got
892 * @return #GNUNET_OK if the message is well-formed,
893 * #GNUNET_SYSERR otherwise
896 check_get_peer (void *cls,
897 const struct GNUNET_CADET_LocalInfoPeer *message)
899 size_t msize = sizeof (struct GNUNET_CADET_LocalInfoPeer);
900 const struct GNUNET_PeerIdentity *paths_array;
906 esize = ntohs (message->header.size);
910 return GNUNET_SYSERR;
912 if (0 != ((esize - msize) % sizeof (struct GNUNET_PeerIdentity)))
915 return GNUNET_SYSERR;
917 peers = (esize - msize) / sizeof (struct GNUNET_PeerIdentity);
918 epaths = ntohs (message->paths);
919 paths_array = (const struct GNUNET_PeerIdentity *) &message[1];
921 for (unsigned int i = 0; i < peers; i++)
922 if (0 == memcmp (&paths_array[i],
923 &message->destination,
924 sizeof (struct GNUNET_PeerIdentity)))
929 return GNUNET_SYSERR;
936 * Process a local peer info reply, pass info to the user.
938 * @param cls Closure (Cadet handle).
939 * @param message Message itself.
942 handle_get_peer (void *cls,
943 const struct GNUNET_CADET_LocalInfoPeer *message)
945 struct GNUNET_CADET_Handle *h = cls;
946 const struct GNUNET_PeerIdentity *paths_array;
948 unsigned int path_length;
952 if (NULL == h->info_cb.peer_cb)
954 paths = ntohs (message->paths);
955 paths_array = (const struct GNUNET_PeerIdentity *) &message[1];
956 peers = (ntohs (message->header.size) - sizeof (*message))
957 / sizeof (struct GNUNET_PeerIdentity);
959 neighbor = GNUNET_NO;
961 for (unsigned int i = 0; i < peers; i++)
963 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
965 GNUNET_i2s (&paths_array[i]));
967 if (0 == memcmp (&paths_array[i], &message->destination,
968 sizeof (struct GNUNET_PeerIdentity)))
970 if (1 == path_length)
971 neighbor = GNUNET_YES;
976 /* Call Callback with tunnel info. */
977 paths_array = (const struct GNUNET_PeerIdentity *) &message[1];
978 h->info_cb.peer_cb (h->info_cls,
979 &message->destination,
980 (int) ntohs (message->tunnel),
988 * Check that message received from CADET service is well-formed.
990 * @param cls the `struct GNUNET_CADET_Handle`
991 * @param message the message we got
992 * @return #GNUNET_OK if the message is well-formed,
993 * #GNUNET_SYSERR otherwise
996 check_get_tunnels (void *cls,
997 const struct GNUNET_MessageHeader *message)
1002 esize = ntohs (message->size);
1003 if (sizeof (struct GNUNET_CADET_LocalInfoTunnel) == esize)
1005 if (sizeof (struct GNUNET_MessageHeader) == esize)
1007 return GNUNET_SYSERR;
1012 * Process a local reply about info on all tunnels, pass info to the user.
1014 * @param cls Closure (Cadet handle).
1015 * @param message Message itself.
1018 handle_get_tunnels (void *cls,
1019 const struct GNUNET_MessageHeader *msg)
1021 struct GNUNET_CADET_Handle *h = cls;
1022 const struct GNUNET_CADET_LocalInfoTunnel *info =
1023 (const struct GNUNET_CADET_LocalInfoTunnel *) msg;
1025 if (NULL == h->info_cb.tunnels_cb)
1027 if (sizeof (struct GNUNET_CADET_LocalInfoTunnel) == ntohs (msg->size))
1028 h->info_cb.tunnels_cb (h->info_cls,
1030 ntohl (info->channels),
1031 ntohl (info->connections),
1032 ntohs (info->estate),
1033 ntohs (info->cstate));
1035 h->info_cb.tunnels_cb (h->info_cls,
1045 * Check that message received from CADET service is well-formed.
1047 * @param cls the `struct GNUNET_CADET_Handle`
1048 * @param msg the message we got
1049 * @return #GNUNET_OK if the message is well-formed,
1050 * #GNUNET_SYSERR otherwise
1053 check_get_tunnel (void *cls,
1054 const struct GNUNET_CADET_LocalInfoTunnel *msg)
1062 /* Verify message sanity */
1063 msize = ntohs (msg->header.size);
1064 esize = sizeof (struct GNUNET_CADET_LocalInfoTunnel);
1068 return GNUNET_SYSERR;
1070 ch_n = ntohl (msg->channels);
1071 c_n = ntohl (msg->connections);
1072 esize += ch_n * sizeof (struct GNUNET_CADET_ChannelTunnelNumber);
1073 esize += c_n * sizeof (struct GNUNET_CADET_ConnectionTunnelIdentifier);
1076 GNUNET_break_op (0);
1077 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1078 "m:%u, e: %u (%u ch, %u conn)\n",
1079 (unsigned int) msize,
1080 (unsigned int) esize,
1083 return GNUNET_SYSERR;
1090 * Process a local tunnel info reply, pass info to the user.
1092 * @param cls Closure (Cadet handle).
1093 * @param msg Message itself.
1096 handle_get_tunnel (void *cls,
1097 const struct GNUNET_CADET_LocalInfoTunnel *msg)
1099 struct GNUNET_CADET_Handle *h = cls;
1102 const struct GNUNET_CADET_ConnectionTunnelIdentifier *conns;
1103 const struct GNUNET_CADET_ChannelTunnelNumber *chns;
1105 if (NULL == h->info_cb.tunnel_cb)
1107 ch_n = ntohl (msg->channels);
1108 c_n = ntohl (msg->connections);
1110 /* Call Callback with tunnel info. */
1111 conns = (const struct GNUNET_CADET_ConnectionTunnelIdentifier *) &msg[1];
1112 chns = (const struct GNUNET_CADET_ChannelTunnelNumber *) &conns[c_n];
1113 h->info_cb.tunnel_cb (h->info_cls,
1119 ntohs (msg->estate),
1120 ntohs (msg->cstate));
1125 * Reconnect to the service, retransmit all infomation to try to restore the
1128 * @param h handle to the cadet
1131 reconnect (struct GNUNET_CADET_Handle *h)
1133 struct GNUNET_MQ_MessageHandler handlers[] = {
1134 GNUNET_MQ_hd_fixed_size (channel_created,
1135 GNUNET_MESSAGE_TYPE_CADET_LOCAL_CHANNEL_CREATE,
1136 struct GNUNET_CADET_LocalChannelCreateMessage,
1138 GNUNET_MQ_hd_fixed_size (channel_destroy,
1139 GNUNET_MESSAGE_TYPE_CADET_LOCAL_CHANNEL_DESTROY,
1140 struct GNUNET_CADET_LocalChannelDestroyMessage,
1142 GNUNET_MQ_hd_var_size (local_data,
1143 GNUNET_MESSAGE_TYPE_CADET_LOCAL_DATA,
1144 struct GNUNET_CADET_LocalData,
1146 GNUNET_MQ_hd_fixed_size (local_ack,
1147 GNUNET_MESSAGE_TYPE_CADET_LOCAL_ACK,
1148 struct GNUNET_CADET_LocalAck,
1150 GNUNET_MQ_hd_var_size (get_peers,
1151 GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_PEERS,
1152 struct GNUNET_MessageHeader,
1154 GNUNET_MQ_hd_var_size (get_peer,
1155 GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_PEER,
1156 struct GNUNET_CADET_LocalInfoPeer,
1158 GNUNET_MQ_hd_var_size (get_tunnels,
1159 GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_TUNNELS,
1160 struct GNUNET_MessageHeader,
1162 GNUNET_MQ_hd_var_size (get_tunnel,
1163 GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_TUNNEL,
1164 struct GNUNET_CADET_LocalInfoTunnel,
1166 GNUNET_MQ_handler_end ()
1169 GNUNET_assert (NULL == h->mq);
1170 h->mq = GNUNET_CLIENT_connect (h->cfg,
1177 schedule_reconnect (h);
1180 h->reconnect_time = GNUNET_TIME_UNIT_MILLISECONDS;
1185 * Function called during #GNUNET_CADET_disconnect() to destroy
1186 * all channels that are still open.
1188 * @param cls the `struct GNUNET_CADET_Handle`
1189 * @param cid chanenl ID
1190 * @param value a `struct GNUNET_CADET_Channel` to destroy
1191 * @return #GNUNET_OK (continue to iterate)
1194 destroy_channel_cb (void *cls,
1198 /* struct GNUNET_CADET_Handle *handle = cls; */
1199 struct GNUNET_CADET_Channel *ch = value;
1203 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1204 "Destroying channel due to GNUNET_CADET_disconnect()\n");
1205 destroy_channel (ch);
1211 * Function called during #GNUNET_CADET_disconnect() to destroy
1212 * all ports that are still open.
1214 * @param cls the `struct GNUNET_CADET_Handle`
1216 * @param value a `struct GNUNET_CADET_Channel` to destroy
1217 * @return #GNUNET_OK (continue to iterate)
1220 destroy_port_cb (void *cls,
1221 const struct GNUNET_HashCode *id,
1224 /* struct GNUNET_CADET_Handle *handle = cls; */
1225 struct GNUNET_CADET_Port *port = value;
1228 /* This is a warning, the app should have cleanly closed all open ports */
1230 GNUNET_CADET_close_port (port);
1236 * Disconnect from the cadet service. All channels will be destroyed. All channel
1237 * disconnect callbacks will be called on any still connected peers, notifying
1238 * about their disconnection. The registered inbound channel cleaner will be
1239 * called should any inbound channels still exist.
1241 * @param handle connection to cadet to disconnect
1244 GNUNET_CADET_disconnect (struct GNUNET_CADET_Handle *handle)
1246 GNUNET_CONTAINER_multihashmap_iterate (handle->ports,
1249 GNUNET_CONTAINER_multihashmap_destroy (handle->ports);
1250 handle->ports = NULL;
1251 GNUNET_CONTAINER_multihashmap32_iterate (handle->channels,
1252 &destroy_channel_cb,
1254 GNUNET_CONTAINER_multihashmap32_destroy (handle->channels);
1255 handle->channels = NULL;
1256 if (NULL != handle->mq)
1258 GNUNET_MQ_destroy (handle->mq);
1261 if (NULL != handle->reconnect_task)
1263 GNUNET_SCHEDULER_cancel (handle->reconnect_task);
1264 handle->reconnect_task = NULL;
1266 GNUNET_free (handle);
1271 * Close a port opened with @a GNUNET_CADET_open_port().
1272 * The @a new_channel callback will no longer be called.
1274 * @param p Port handle.
1277 GNUNET_CADET_close_port (struct GNUNET_CADET_Port *p)
1279 struct GNUNET_CADET_PortMessage *msg;
1280 struct GNUNET_MQ_Envelope *env;
1282 GNUNET_assert (GNUNET_YES ==
1283 GNUNET_CONTAINER_multihashmap_remove (p->cadet->ports,
1286 env = GNUNET_MQ_msg (msg,
1287 GNUNET_MESSAGE_TYPE_CADET_LOCAL_PORT_CLOSE);
1289 GNUNET_MQ_send (p->cadet->mq,
1291 GNUNET_free_non_null (p->handlers);
1297 * Destroy an existing channel.
1299 * The existing end callback for the channel will be called immediately.
1300 * Any pending outgoing messages will be sent but no incoming messages will be
1301 * accepted and no data callbacks will be called.
1303 * @param channel Channel handle, becomes invalid after this call.
1306 GNUNET_CADET_channel_destroy (struct GNUNET_CADET_Channel *channel)
1308 struct GNUNET_CADET_Handle *h = channel->cadet;
1309 struct GNUNET_CADET_LocalChannelDestroyMessage *msg;
1310 struct GNUNET_MQ_Envelope *env;
1314 env = GNUNET_MQ_msg (msg,
1315 GNUNET_MESSAGE_TYPE_CADET_LOCAL_CHANNEL_DESTROY);
1316 msg->ccn = channel->ccn;
1317 GNUNET_MQ_send (h->mq,
1320 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1321 "Destroying channel due to GNUNET_CADET_channel_destroy()\n");
1322 destroy_channel (channel);
1327 * Get information about a channel.
1329 * @param channel Channel handle.
1330 * @param option Query (GNUNET_CADET_OPTION_*).
1331 * @param ... dependant on option, currently not used
1333 * @return Union with an answer to the query.
1335 const union GNUNET_CADET_ChannelInfo *
1336 GNUNET_CADET_channel_get_info (struct GNUNET_CADET_Channel *channel,
1337 enum GNUNET_CADET_ChannelOption option,
1340 static int bool_flag;
1344 case GNUNET_CADET_OPTION_NOBUFFER:
1345 case GNUNET_CADET_OPTION_RELIABLE:
1346 case GNUNET_CADET_OPTION_OUT_OF_ORDER:
1347 if (0 != (option & channel->options))
1348 bool_flag = GNUNET_YES;
1350 bool_flag = GNUNET_NO;
1351 return (const union GNUNET_CADET_ChannelInfo *) &bool_flag;
1353 case GNUNET_CADET_OPTION_PEER:
1354 return (const union GNUNET_CADET_ChannelInfo *) &channel->peer;
1364 * Send an ack on the channel to confirm the processing of a message.
1366 * @param ch Channel on which to send the ACK.
1369 GNUNET_CADET_receive_done (struct GNUNET_CADET_Channel *channel)
1371 struct GNUNET_CADET_LocalAck *msg;
1372 struct GNUNET_MQ_Envelope *env;
1374 env = GNUNET_MQ_msg (msg,
1375 GNUNET_MESSAGE_TYPE_CADET_LOCAL_ACK);
1376 LOG (GNUNET_ERROR_TYPE_DEBUG,
1377 "Sending ACK on channel %X\n",
1378 ntohl (channel->ccn.channel_of_client));
1379 msg->ccn = channel->ccn;
1380 GNUNET_MQ_send (channel->cadet->mq,
1386 * Send message of @a type to CADET service of @a h
1388 * @param h handle to CADET service
1389 * @param type message type of trivial information request to send
1392 send_info_request (struct GNUNET_CADET_Handle *h,
1395 struct GNUNET_MessageHeader *msg;
1396 struct GNUNET_MQ_Envelope *env;
1398 env = GNUNET_MQ_msg (msg,
1400 GNUNET_MQ_send (h->mq,
1406 * Request a debug dump on the service's STDERR.
1408 * WARNING: unstable API, likely to change in the future!
1410 * @param h cadet handle
1413 GNUNET_CADET_request_dump (struct GNUNET_CADET_Handle *h)
1415 send_info_request (h,
1416 GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_DUMP);
1421 * Request information about peers known to the running cadet service.
1422 * The callback will be called for every peer known to the service.
1423 * Only one info request (of any kind) can be active at once.
1425 * WARNING: unstable API, likely to change in the future!
1427 * @param h Handle to the cadet peer.
1428 * @param callback Function to call with the requested data.
1429 * @param callback_cls Closure for @c callback.
1430 * @return #GNUNET_OK / #GNUNET_SYSERR
1433 GNUNET_CADET_get_peers (struct GNUNET_CADET_Handle *h,
1434 GNUNET_CADET_PeersCB callback,
1437 if (NULL != h->info_cb.peers_cb)
1440 return GNUNET_SYSERR;
1442 send_info_request (h,
1443 GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_PEERS);
1444 h->info_cb.peers_cb = callback;
1445 h->info_cls = callback_cls;
1451 * Cancel a peer info request. The callback will not be called (anymore).
1453 * WARNING: unstable API, likely to change in the future!
1455 * @param h Cadet handle.
1456 * @return Closure given to GNUNET_CADET_get_peers().
1459 GNUNET_CADET_get_peers_cancel (struct GNUNET_CADET_Handle *h)
1461 void *cls = h->info_cls;
1463 h->info_cb.peers_cb = NULL;
1470 * Request information about a peer known to the running cadet peer.
1471 * The callback will be called for the tunnel once.
1472 * Only one info request (of any kind) can be active at once.
1474 * WARNING: unstable API, likely to change in the future!
1476 * @param h Handle to the cadet peer.
1477 * @param id Peer whose tunnel to examine.
1478 * @param callback Function to call with the requested data.
1479 * @param callback_cls Closure for @c callback.
1480 * @return #GNUNET_OK / #GNUNET_SYSERR
1483 GNUNET_CADET_get_peer (struct GNUNET_CADET_Handle *h,
1484 const struct GNUNET_PeerIdentity *id,
1485 GNUNET_CADET_PeerCB callback,
1488 struct GNUNET_CADET_LocalInfo *msg;
1489 struct GNUNET_MQ_Envelope *env;
1491 if (NULL != h->info_cb.peer_cb)
1494 return GNUNET_SYSERR;
1496 env = GNUNET_MQ_msg (msg,
1497 GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_PEER);
1499 GNUNET_MQ_send (h->mq,
1501 h->info_cb.peer_cb = callback;
1502 h->info_cls = callback_cls;
1508 * Request information about tunnels of the running cadet peer.
1509 * The callback will be called for every tunnel of the service.
1510 * Only one info request (of any kind) can be active at once.
1512 * WARNING: unstable API, likely to change in the future!
1514 * @param h Handle to the cadet peer.
1515 * @param callback Function to call with the requested data.
1516 * @param callback_cls Closure for @c callback.
1517 * @return #GNUNET_OK / #GNUNET_SYSERR
1520 GNUNET_CADET_get_tunnels (struct GNUNET_CADET_Handle *h,
1521 GNUNET_CADET_TunnelsCB callback,
1524 if (NULL != h->info_cb.tunnels_cb)
1527 return GNUNET_SYSERR;
1529 send_info_request (h,
1530 GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_TUNNELS);
1531 h->info_cb.tunnels_cb = callback;
1532 h->info_cls = callback_cls;
1538 * Cancel a monitor request. The monitor callback will not be called.
1540 * @param h Cadet handle.
1541 * @return Closure given to GNUNET_CADET_get_tunnels().
1544 GNUNET_CADET_get_tunnels_cancel (struct GNUNET_CADET_Handle *h)
1546 void *cls = h->info_cls;
1548 h->info_cb.tunnels_cb = NULL;
1555 * Request information about a tunnel of the running cadet peer.
1556 * The callback will be called for the tunnel once.
1557 * Only one info request (of any kind) can be active at once.
1559 * WARNING: unstable API, likely to change in the future!
1561 * @param h Handle to the cadet peer.
1562 * @param id Peer whose tunnel to examine.
1563 * @param callback Function to call with the requested data.
1564 * @param callback_cls Closure for @c callback.
1565 * @return #GNUNET_OK / #GNUNET_SYSERR
1568 GNUNET_CADET_get_tunnel (struct GNUNET_CADET_Handle *h,
1569 const struct GNUNET_PeerIdentity *id,
1570 GNUNET_CADET_TunnelCB callback,
1573 struct GNUNET_CADET_LocalInfo *msg;
1574 struct GNUNET_MQ_Envelope *env;
1576 if (NULL != h->info_cb.tunnel_cb)
1579 return GNUNET_SYSERR;
1581 env = GNUNET_MQ_msg (msg,
1582 GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_TUNNEL);
1584 GNUNET_MQ_send (h->mq,
1586 h->info_cb.tunnel_cb = callback;
1587 h->info_cls = callback_cls;
1593 * Transitional function to convert an unsigned int port to a hash value.
1594 * WARNING: local static value returned, NOT reentrant!
1595 * WARNING: do not use this function for new code!
1597 * @param port Numerical port (unsigned int format).
1599 * @return A GNUNET_HashCode usable for the new CADET API.
1601 const struct GNUNET_HashCode *
1602 GC_u2h (uint32_t port)
1604 static struct GNUNET_HashCode hash;
1606 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1607 "This is a transitional function, use proper crypto hashes as CADET ports\n");
1608 GNUNET_CRYPTO_hash (&port,
1616 * Connect to the MQ-based cadet service.
1618 * @param cfg Configuration to use.
1620 * @return Handle to the cadet service NULL on error.
1622 struct GNUNET_CADET_Handle *
1623 GNUNET_CADET_connect (const struct GNUNET_CONFIGURATION_Handle *cfg)
1625 struct GNUNET_CADET_Handle *h;
1627 LOG (GNUNET_ERROR_TYPE_DEBUG,
1628 "GNUNET_CADET_connect()\n");
1629 h = GNUNET_new (struct GNUNET_CADET_Handle);
1631 h->ports = GNUNET_CONTAINER_multihashmap_create (4,
1633 h->channels = GNUNET_CONTAINER_multihashmap32_create (4);
1638 GNUNET_CADET_disconnect (h);
1641 h->next_ccn.channel_of_client = htonl (GNUNET_CADET_LOCAL_CHANNEL_ID_CLI);
1642 h->reconnect_time = GNUNET_TIME_UNIT_MILLISECONDS;
1643 h->reconnect_task = NULL;
1650 * Open a port to receive incomming MQ-based channels.
1652 * @param h CADET handle.
1653 * @param port Hash identifying the port.
1654 * @param connects Function called when an incoming channel is connected.
1655 * @param connects_cls Closure for the @a connects handler.
1656 * @param window_changes Function called when the transmit window size changes.
1657 * @param disconnects Function called when a channel is disconnected.
1658 * @param handlers Callbacks for messages we care about, NULL-terminated.
1659 * @return Port handle, NULL if port is in use
1661 struct GNUNET_CADET_Port *
1662 GNUNET_CADET_open_port (struct GNUNET_CADET_Handle *h,
1663 const struct GNUNET_HashCode *port,
1664 GNUNET_CADET_ConnectEventHandler connects,
1665 void * connects_cls,
1666 GNUNET_CADET_WindowSizeEventHandler window_changes,
1667 GNUNET_CADET_DisconnectEventHandler disconnects,
1668 const struct GNUNET_MQ_MessageHandler *handlers)
1670 struct GNUNET_CADET_PortMessage *msg;
1671 struct GNUNET_MQ_Envelope *env;
1672 struct GNUNET_CADET_Port *p;
1674 GNUNET_assert (NULL != connects);
1675 GNUNET_assert (NULL != disconnects);
1676 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1677 "Listening to CADET port %s\n",
1680 p = GNUNET_new (struct GNUNET_CADET_Port);
1684 GNUNET_CONTAINER_multihashmap_put (h->ports,
1687 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
1692 p->connects = connects;
1693 p->cls = connects_cls;
1694 p->window_changes = window_changes;
1695 p->disconnects = disconnects;
1696 p->handlers = GNUNET_MQ_copy_handlers (handlers);
1699 env = GNUNET_MQ_msg (msg,
1700 GNUNET_MESSAGE_TYPE_CADET_LOCAL_PORT_OPEN);
1702 GNUNET_MQ_send (h->mq,
1709 * Create a new channel towards a remote peer.
1711 * If the destination port is not open by any peer or the destination peer
1712 * does not accept the channel, #GNUNET_CADET_ChannelEndHandler will be called
1715 * @param h CADET handle.
1716 * @param channel_cls Closure for the channel. It's given to:
1717 * - The disconnect handler @a disconnects
1718 * - Each message type callback in @a handlers
1719 * @param destination Peer identity the channel should go to.
1720 * @param port Identification of the destination port.
1721 * @param options CadetOption flag field, with all desired option bits set to 1.
1722 * @param window_changes Function called when the transmit window size changes.
1723 * @param disconnects Function called when the channel is disconnected.
1724 * @param handlers Callbacks for messages we care about, NULL-terminated.
1725 * @return Handle to the channel.
1727 struct GNUNET_CADET_Channel *
1728 GNUNET_CADET_channel_create (struct GNUNET_CADET_Handle *h,
1730 const struct GNUNET_PeerIdentity *destination,
1731 const struct GNUNET_HashCode *port,
1732 enum GNUNET_CADET_ChannelOption options,
1733 GNUNET_CADET_WindowSizeEventHandler window_changes,
1734 GNUNET_CADET_DisconnectEventHandler disconnects,
1735 const struct GNUNET_MQ_MessageHandler *handlers)
1737 struct GNUNET_CADET_Channel *ch;
1738 struct GNUNET_CADET_LocalChannelCreateMessage *msg;
1739 struct GNUNET_MQ_Envelope *env;
1741 GNUNET_assert (NULL != disconnects);
1742 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1743 "Creating channel to peer %s at port %s\n",
1744 GNUNET_i2s (destination),
1746 ch = create_channel (h,
1748 ch->ctx = channel_cls;
1749 ch->peer = *destination;
1750 ch->options = options;
1751 ch->window_changes = window_changes;
1752 ch->disconnects = disconnects;
1754 /* Create MQ for channel */
1755 ch->mq = GNUNET_MQ_queue_for_callbacks (&cadet_mq_send_impl,
1756 &cadet_mq_destroy_impl,
1757 &cadet_mq_cancel_impl,
1760 &cadet_mq_error_handler,
1762 GNUNET_MQ_set_handlers_closure (ch->mq, channel_cls);
1764 /* Request channel creation to service */
1765 env = GNUNET_MQ_msg (msg,
1766 GNUNET_MESSAGE_TYPE_CADET_LOCAL_CHANNEL_CREATE);
1769 msg->peer = *destination;
1770 msg->opt = htonl (options);
1771 GNUNET_MQ_send (h->mq,
1778 * Obtain the message queue for a connected peer.
1780 * @param channel The channel handle from which to get the MQ.
1782 * @return NULL if @a channel is not yet connected.
1784 struct GNUNET_MQ_Handle *
1785 GNUNET_CADET_get_mq (const struct GNUNET_CADET_Channel *channel)
1790 /* end of cadet_api.c */