2 This file is part of GNUnet.
3 (C) 2013 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
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., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
21 * @file conversation/gnunet-service-conversation.c
22 * @brief conversation service implementation
23 * @author Simon Dieterle
24 * @author Andreas Fuchs
25 * @author Christian Grothoff
28 #include "gnunet_util_lib.h"
29 #include "gnunet_protocols.h"
30 #include "gnunet_applications.h"
31 #include "gnunet_constants.h"
32 #include "gnunet_signatures.h"
33 #include "gnunet_mesh_service.h"
34 #include "gnunet_conversation_service.h"
35 #include "conversation.h"
39 * How long is our signature on a call valid? Needs to be long enough for time zone
40 * differences and network latency to not matter. No strong need for it to be short,
41 * but we simply like all signatures to eventually expire.
43 #define RING_TIMEOUT GNUNET_TIME_UNIT_DAYS
47 * A line connects a local client with a mesh channel (or, if it is an
48 * open line, is waiting for a mesh channel).
53 * The possible connection status
58 * Our phone is ringing, waiting for the client to pick up.
68 * We're in shutdown, sending hangup messages before cleaning up.
73 * We are waiting for the phone to be picked up.
83 * We're in shutdown, sending hangup messages before cleaning up.
91 * A `struct Channel` represents a mesh channel, which is a P2P
92 * connection to another conversation service. Multiple channels can
93 * be attached the the same `struct Line`, which represents a local
94 * client. We keep them in a linked list.
102 struct Channel *next;
107 struct Channel *prev;
110 * Line associated with the channel.
115 * Handle for the reliable channel (contol data)
117 struct GNUNET_MESH_Channel *channel_reliable;
120 * Handle for unreliable channel (audio data)
122 struct GNUNET_MESH_Channel *channel_unreliable;
125 * Transmit handle for pending audio messages
127 struct GNUNET_MESH_TransmitHandle *unreliable_mth;
130 * Message queue for control messages
132 struct GNUNET_MQ_Handle *reliable_mq;
135 * Target of the line, if we are the caller.
137 struct GNUNET_PeerIdentity target;
140 * Temporary buffer for audio data.
145 * Number of bytes in @e audio_data.
150 * Channel identifier.
155 * Remote line number.
157 uint32_t remote_line;
160 * Current status of this line.
162 enum ChannelStatus status;
165 * #GNUNET_YES if the channel was suspended by the other peer.
167 int8_t suspended_remote;
170 * #GNUNET_YES if the channel was suspended by the local client.
172 int8_t suspended_local;
178 * A `struct Line` connects a local client with mesh channels.
195 struct Channel *channel_head;
200 struct Channel *channel_tail;
203 * Handle to the line client.
205 struct GNUNET_SERVER_Client *client;
208 * Generator for channel IDs.
223 static const struct GNUNET_CONFIGURATION_Handle *cfg;
226 * Notification context containing all connected clients.
228 static struct GNUNET_SERVER_NotificationContext *nc;
233 static struct GNUNET_MESH_Handle *mesh;
236 * Identity of this peer.
238 static struct GNUNET_PeerIdentity my_identity;
241 * Head of DLL of active lines.
243 static struct Line *lines_head;
246 * Tail of DLL of active lines.
248 static struct Line *lines_tail;
251 * Counter for generating local line numbers.
252 * FIXME: randomize generation in the future
253 * to eliminate information leakage.
255 static uint32_t local_line_cnt;
259 * Function to register a phone.
261 * @param cls closure, NULL
262 * @param client the client from which the message is
263 * @param message the message from the client
266 handle_client_register_message (void *cls,
267 struct GNUNET_SERVER_Client *client,
268 const struct GNUNET_MessageHeader *message)
270 const struct ClientPhoneRegisterMessage *msg;
273 msg = (const struct ClientPhoneRegisterMessage *) message;
274 line = GNUNET_SERVER_client_get_user_context (client, struct Line);
278 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
281 line = GNUNET_new (struct Line);
282 line->client = client;
283 GNUNET_SERVER_notification_context_add (nc, client);
284 GNUNET_SERVER_client_set_user_context (client, line);
285 GNUNET_CONTAINER_DLL_insert (lines_head,
288 line->local_line = ntohl (msg->line) & (~ (1 << 31));
289 GNUNET_SERVER_receive_done (client, GNUNET_OK);
294 * Function to handle a pickup request message from the client
296 * @param cls closure, NULL
297 * @param client the client from which the message is
298 * @param message the message from the client
301 handle_client_pickup_message (void *cls,
302 struct GNUNET_SERVER_Client *client,
303 const struct GNUNET_MessageHeader *message)
305 const struct ClientPhonePickupMessage *msg;
306 struct GNUNET_MQ_Envelope *e;
307 struct MeshPhonePickupMessage *mppm;
311 msg = (const struct ClientPhonePickupMessage *) message;
312 line = GNUNET_SERVER_client_get_user_context (client, struct Line);
316 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
319 for (ch = line->channel_head; NULL != ch; ch = ch->next)
320 if (msg->cid == ch->cid)
324 /* could have been destroyed asynchronously, ignore message */
325 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
326 "Channel %u not found\n",
332 case CS_CALLEE_RINGING:
333 ch->status = CS_CALLEE_CONNECTED;
335 case CS_CALLEE_CONNECTED:
337 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
339 case CS_CALLEE_SHUTDOWN:
340 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
341 "Ignoring client's PICKUP message, line is in SHUTDOWN\n");
342 GNUNET_SERVER_receive_done (client, GNUNET_OK);
344 case CS_CALLER_CALLING:
345 case CS_CALLER_CONNECTED:
346 case CS_CALLER_SHUTDOWN:
348 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
351 GNUNET_break (CS_CALLEE_CONNECTED == ch->status);
352 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
353 "Sending PICK_UP message to mesh\n");
354 e = GNUNET_MQ_msg (mppm,
355 GNUNET_MESSAGE_TYPE_CONVERSATION_MESH_PHONE_PICK_UP);
356 GNUNET_MQ_send (ch->reliable_mq, e);
357 GNUNET_SERVER_receive_done (client, GNUNET_OK);
364 * @param ch channel to destroy.
367 destroy_line_mesh_channels (struct Channel *ch)
369 struct Line *line = ch->line;
370 struct GNUNET_MESH_Channel *t;
372 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
373 "Destroying mesh channels\n");
374 if (NULL != ch->reliable_mq)
376 GNUNET_MQ_destroy (ch->reliable_mq);
377 ch->reliable_mq = NULL;
379 if (NULL != ch->unreliable_mth)
381 GNUNET_MESH_notify_transmit_ready_cancel (ch->unreliable_mth);
382 ch->unreliable_mth = NULL;
384 if (NULL != (t = ch->channel_unreliable))
386 ch->channel_unreliable = NULL;
387 GNUNET_MESH_channel_destroy (t);
389 if (NULL != (t = ch->channel_reliable))
391 ch->channel_reliable = NULL;
392 GNUNET_MESH_channel_destroy (t);
394 GNUNET_CONTAINER_DLL_remove (line->channel_head,
397 GNUNET_free_non_null (ch->audio_data);
403 * We are done signalling shutdown to the other peer. Close down
406 * @param cls the `struct Channel` to reset/terminate
409 mq_done_finish_caller_shutdown (void *cls)
411 struct Channel *ch = cls;
415 case CS_CALLEE_RINGING:
418 case CS_CALLEE_CONNECTED:
421 case CS_CALLEE_SHUTDOWN:
422 destroy_line_mesh_channels (ch);
424 case CS_CALLER_CALLING:
427 case CS_CALLER_CONNECTED:
430 case CS_CALLER_SHUTDOWN:
431 destroy_line_mesh_channels (ch);
438 * Function to handle a hangup request message from the client
440 * @param cls closure, NULL
441 * @param client the client from which the message is
442 * @param message the message from the client
445 handle_client_hangup_message (void *cls,
446 struct GNUNET_SERVER_Client *client,
447 const struct GNUNET_MessageHeader *message)
449 const struct ClientPhoneHangupMessage *msg;
450 struct GNUNET_MQ_Envelope *e;
451 struct MeshPhoneHangupMessage *mhum;
455 msg = (const struct ClientPhoneHangupMessage *) message;
456 line = GNUNET_SERVER_client_get_user_context (client, struct Line);
460 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
463 for (ch = line->channel_head; NULL != ch; ch = ch->next)
464 if (msg->cid == ch->cid)
468 /* could have been destroyed asynchronously, ignore message */
469 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
470 "Channel %u not found\n",
472 GNUNET_SERVER_receive_done (client, GNUNET_OK);
478 case CS_CALLEE_RINGING:
479 ch->status = CS_CALLEE_SHUTDOWN;
481 case CS_CALLEE_CONNECTED:
482 ch->status = CS_CALLEE_SHUTDOWN;
484 case CS_CALLEE_SHUTDOWN:
485 /* maybe the other peer closed asynchronously... */
487 case CS_CALLER_CALLING:
488 ch->status = CS_CALLER_SHUTDOWN;
490 case CS_CALLER_CONNECTED:
491 ch->status = CS_CALLER_SHUTDOWN;
493 case CS_CALLER_SHUTDOWN:
494 /* maybe the other peer closed asynchronously... */
497 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
498 "Sending HANG_UP message via mesh\n");
499 e = GNUNET_MQ_msg (mhum,
500 GNUNET_MESSAGE_TYPE_CONVERSATION_MESH_PHONE_HANG_UP);
501 GNUNET_MQ_notify_sent (e,
502 &mq_done_finish_caller_shutdown,
504 GNUNET_MQ_send (ch->reliable_mq, e);
505 GNUNET_SERVER_receive_done (client, GNUNET_OK);
510 * Function to handle a suspend request message from the client
512 * @param cls closure, NULL
513 * @param client the client from which the message is
514 * @param message the message from the client
517 handle_client_suspend_message (void *cls,
518 struct GNUNET_SERVER_Client *client,
519 const struct GNUNET_MessageHeader *message)
521 const struct ClientPhoneSuspendMessage *msg;
522 struct GNUNET_MQ_Envelope *e;
523 struct MeshPhoneSuspendMessage *mhum;
527 msg = (const struct ClientPhoneSuspendMessage *) message;
528 line = GNUNET_SERVER_client_get_user_context (client, struct Line);
532 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
535 for (ch = line->channel_head; NULL != ch; ch = ch->next)
536 if (msg->cid == ch->cid)
540 /* could have been destroyed asynchronously, ignore message */
541 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
542 "Channel %u not found\n",
546 if (GNUNET_YES == ch->suspended_local)
549 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
554 case CS_CALLEE_RINGING:
556 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
558 case CS_CALLEE_CONNECTED:
559 ch->suspended_local = GNUNET_YES;
561 case CS_CALLEE_SHUTDOWN:
562 /* maybe the other peer closed asynchronously... */
564 case CS_CALLER_CALLING:
566 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
568 case CS_CALLER_CONNECTED:
569 ch->suspended_local = GNUNET_YES;
571 case CS_CALLER_SHUTDOWN:
572 /* maybe the other peer closed asynchronously... */
575 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
576 "Sending SUSPEND message via mesh\n");
577 e = GNUNET_MQ_msg (mhum,
578 GNUNET_MESSAGE_TYPE_CONVERSATION_MESH_PHONE_SUSPEND);
579 GNUNET_MQ_send (ch->reliable_mq, e);
580 GNUNET_SERVER_receive_done (client, GNUNET_OK);
585 * Function to handle a resume request message from the client
587 * @param cls closure, NULL
588 * @param client the client from which the message is
589 * @param message the message from the client
592 handle_client_resume_message (void *cls,
593 struct GNUNET_SERVER_Client *client,
594 const struct GNUNET_MessageHeader *message)
596 const struct ClientPhoneResumeMessage *msg;
597 struct GNUNET_MQ_Envelope *e;
598 struct MeshPhoneResumeMessage *mhum;
602 msg = (const struct ClientPhoneResumeMessage *) message;
603 line = GNUNET_SERVER_client_get_user_context (client, struct Line);
607 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
610 for (ch = line->channel_head; NULL != ch; ch = ch->next)
611 if (msg->cid == ch->cid)
615 /* could have been destroyed asynchronously, ignore message */
616 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
617 "Channel %u not found\n",
621 if (GNUNET_YES != ch->suspended_local)
624 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
629 case CS_CALLEE_RINGING:
631 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
633 case CS_CALLEE_CONNECTED:
634 ch->suspended_local = GNUNET_NO;
636 case CS_CALLEE_SHUTDOWN:
637 /* maybe the other peer closed asynchronously... */
639 case CS_CALLER_CALLING:
641 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
643 case CS_CALLER_CONNECTED:
644 ch->suspended_local = GNUNET_NO;
646 case CS_CALLER_SHUTDOWN:
647 /* maybe the other peer closed asynchronously... */
650 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
651 "Sending RESUME message via mesh\n");
652 e = GNUNET_MQ_msg (mhum,
653 GNUNET_MESSAGE_TYPE_CONVERSATION_MESH_PHONE_RESUME);
654 GNUNET_MQ_send (ch->reliable_mq, e);
655 GNUNET_SERVER_receive_done (client, GNUNET_OK);
660 * Function to handle call request from the client
662 * @param cls closure, NULL
663 * @param client the client from which the message is
664 * @param message the message from the client
667 handle_client_call_message (void *cls,
668 struct GNUNET_SERVER_Client *client,
669 const struct GNUNET_MessageHeader *message)
671 const struct ClientCallMessage *msg;
674 struct GNUNET_MQ_Envelope *e;
675 struct MeshPhoneRingMessage *ring;
677 msg = (const struct ClientCallMessage *) message;
678 line = GNUNET_SERVER_client_get_user_context (client, struct Line);
682 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
685 line = GNUNET_new (struct Line);
686 line->client = client;
687 line->local_line = (local_line_cnt++) | (1 << 31);
688 GNUNET_SERVER_client_set_user_context (client, line);
689 GNUNET_SERVER_notification_context_add (nc, client);
690 GNUNET_CONTAINER_DLL_insert (lines_head,
693 ch = GNUNET_new (struct Channel);
695 GNUNET_CONTAINER_DLL_insert (line->channel_head,
698 ch->target = msg->target;
699 ch->remote_line = ntohl (msg->line);
700 ch->status = CS_CALLER_CALLING;
701 ch->channel_reliable = GNUNET_MESH_channel_create (mesh,
704 GNUNET_APPLICATION_TYPE_CONVERSATION_CONTROL,
705 GNUNET_MESH_OPTION_RELIABLE);
706 ch->reliable_mq = GNUNET_MESH_mq_create (ch->channel_reliable);
707 e = GNUNET_MQ_msg (ring, GNUNET_MESSAGE_TYPE_CONVERSATION_MESH_PHONE_RING);
708 ring->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_CONVERSATION_RING);
709 ring->purpose.size = htonl (sizeof (struct GNUNET_PeerIdentity) * 2 +
710 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
711 sizeof (struct GNUNET_CRYPTO_EccSignaturePurpose) +
712 sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey));
713 GNUNET_CRYPTO_ecdsa_key_get_public (&msg->caller_id,
715 ring->remote_line = msg->line;
716 ring->source_line = htonl (line->local_line);
717 ring->target = msg->target;
718 ring->source = my_identity;
719 ring->expiration_time = GNUNET_TIME_absolute_hton (GNUNET_TIME_relative_to_absolute (RING_TIMEOUT));
720 GNUNET_CRYPTO_ecdsa_sign (&msg->caller_id,
723 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
724 "Sending RING message via mesh\n");
725 GNUNET_MQ_send (ch->reliable_mq, e);
726 GNUNET_SERVER_receive_done (client, GNUNET_OK);
731 * Transmit audio data via unreliable mesh channel.
733 * @param cls the `struct Channel` we are transmitting for
734 * @param size number of bytes available in @a buf
735 * @param buf where to copy the data
736 * @return number of bytes copied to @a buf
739 transmit_line_audio (void *cls,
743 struct Channel *ch = cls;
744 struct MeshAudioMessage *mam = buf;
746 ch->unreliable_mth = NULL;
747 if ( (NULL == buf) ||
748 (size < sizeof (struct MeshAudioMessage) + ch->audio_size) )
750 /* eh, other error handling? */
753 mam->header.size = htons (sizeof (struct MeshAudioMessage) + ch->audio_size);
754 mam->header.type = htons (GNUNET_MESSAGE_TYPE_CONVERSATION_MESH_AUDIO);
755 mam->remote_line = htonl (ch->remote_line);
756 memcpy (&mam[1], ch->audio_data, ch->audio_size);
757 GNUNET_free (ch->audio_data);
758 ch->audio_data = NULL;
759 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
760 "Sending %u bytes of audio data from line %u to remote line %u via mesh\n",
761 ch->audio_size, ch->line->local_line, ch->remote_line);
762 return sizeof (struct MeshAudioMessage) + ch->audio_size;
767 * Function to handle audio data from the client
769 * @param cls closure, NULL
770 * @param client the client from which the message is
771 * @param message the message from the client
774 handle_client_audio_message (void *cls,
775 struct GNUNET_SERVER_Client *client,
776 const struct GNUNET_MessageHeader *message)
778 const struct ClientAudioMessage *msg;
783 size = ntohs (message->size) - sizeof (struct ClientAudioMessage);
784 msg = (const struct ClientAudioMessage *) message;
785 line = GNUNET_SERVER_client_get_user_context (client, struct Line);
789 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
792 for (ch = line->channel_head; NULL != ch; ch = ch->next)
793 if (msg->cid == ch->cid)
797 /* could have been destroyed asynchronously, ignore message */
798 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
799 "Channel %u not found\n",
806 case CS_CALLEE_RINGING:
807 case CS_CALLER_CALLING:
809 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
811 case CS_CALLEE_CONNECTED:
812 case CS_CALLER_CONNECTED:
813 /* common case, handled below */
815 case CS_CALLEE_SHUTDOWN:
816 case CS_CALLER_SHUTDOWN:
817 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
818 "Mesh audio channel in shutdown; audio data dropped\n");
819 GNUNET_SERVER_receive_done (client, GNUNET_OK);
822 if (GNUNET_YES == ch->suspended_local)
824 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "This channel is suspended locally\n");
825 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
828 if (NULL == ch->channel_unreliable)
830 GNUNET_log (GNUNET_ERROR_TYPE_INFO | GNUNET_ERROR_TYPE_BULK,
831 _("Mesh audio channel not ready; audio data dropped\n"));
832 GNUNET_SERVER_receive_done (client, GNUNET_OK);
835 if (NULL != ch->unreliable_mth)
837 /* NOTE: we may want to not do this and instead combine the data */
838 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
839 "Bandwidth insufficient; dropping previous audio data segment with %u bytes\n",
840 (unsigned int) ch->audio_size);
841 GNUNET_MESH_notify_transmit_ready_cancel (ch->unreliable_mth);
842 ch->unreliable_mth = NULL;
843 GNUNET_free (ch->audio_data);
844 ch->audio_data = NULL;
846 ch->audio_size = size;
847 ch->audio_data = GNUNET_malloc (ch->audio_size);
848 memcpy (ch->audio_data,
851 ch->unreliable_mth = GNUNET_MESH_notify_transmit_ready (ch->channel_unreliable,
853 GNUNET_TIME_UNIT_FOREVER_REL,
854 sizeof (struct MeshAudioMessage)
856 &transmit_line_audio,
858 GNUNET_SERVER_receive_done (client, GNUNET_OK);
863 * We are done signalling shutdown to the other peer.
864 * Destroy the channel.
866 * @param cls the `struct GNUNET_MESH_channel` to destroy
869 mq_done_destroy_channel (void *cls)
871 struct GNUNET_MESH_Channel *channel = cls;
873 GNUNET_MESH_channel_destroy (channel);
878 * Function to handle a ring message incoming over mesh
880 * @param cls closure, NULL
881 * @param channel the channel over which the message arrived
882 * @param channel_ctx the channel context, can be NULL
883 * or point to the `struct Channel`
884 * @param message the incoming message
888 handle_mesh_ring_message (void *cls,
889 struct GNUNET_MESH_Channel *channel,
891 const struct GNUNET_MessageHeader *message)
893 const struct MeshPhoneRingMessage *msg;
896 struct GNUNET_MQ_Envelope *e;
897 struct MeshPhoneHangupMessage *hang_up;
898 struct ClientPhoneRingMessage cring;
899 struct GNUNET_MQ_Handle *reliable_mq;
901 msg = (const struct MeshPhoneRingMessage *) message;
902 if ( (msg->purpose.size != htonl (sizeof (struct GNUNET_PeerIdentity) * 2 +
903 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
904 sizeof (struct GNUNET_CRYPTO_EccSignaturePurpose) +
905 sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey))) ||
907 GNUNET_CRYPTO_ecdsa_verify (GNUNET_SIGNATURE_PURPOSE_CONVERSATION_RING,
913 return GNUNET_SYSERR;
915 for (line = lines_head; NULL != line; line = line->next)
916 if (line->local_line == ntohl (msg->remote_line))
920 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
921 _("No available phone for incoming call on line %u, sending HANG_UP signal\n"),
922 ntohl (msg->remote_line));
923 e = GNUNET_MQ_msg (hang_up,
924 GNUNET_MESSAGE_TYPE_CONVERSATION_MESH_PHONE_HANG_UP);
925 GNUNET_MQ_notify_sent (e,
926 &mq_done_destroy_channel,
928 reliable_mq = GNUNET_MESH_mq_create (channel);
929 GNUNET_MQ_send (reliable_mq, e);
930 /* FIXME: do we need to clean up reliable_mq somehow/somewhere? */
931 GNUNET_MESH_receive_done (channel); /* needed? */
934 ch = GNUNET_new (struct Channel);
936 GNUNET_CONTAINER_DLL_insert (line->channel_head,
939 ch->status = CS_CALLEE_RINGING;
940 ch->remote_line = ntohl (msg->source_line);
941 ch->channel_reliable = channel;
942 ch->reliable_mq = GNUNET_MESH_mq_create (ch->channel_reliable);
943 ch->cid = line->cid_gen++;
944 ch->target = msg->source;
946 cring.header.type = htons (GNUNET_MESSAGE_TYPE_CONVERSATION_CS_PHONE_RING);
947 cring.header.size = htons (sizeof (cring));
949 cring.caller_id = msg->caller_id;
950 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
951 "Sending RING message to client. CID %u:(%u, %u)\n",
952 ch->cid, ch->remote_line, line->local_line);
953 GNUNET_SERVER_notification_context_unicast (nc,
957 GNUNET_MESH_receive_done (channel);
963 * Function to handle a hangup message incoming over mesh
965 * @param cls closure, NULL
966 * @param channel the channel over which the message arrived
967 * @param channel_ctx the channel context, can be NULL
968 * or point to the `struct Channel`
969 * @param message the incoming message
973 handle_mesh_hangup_message (void *cls,
974 struct GNUNET_MESH_Channel *channel,
976 const struct GNUNET_MessageHeader *message)
978 struct Channel *ch = *channel_ctx;
980 struct ClientPhoneHangupMessage hup;
981 enum ChannelStatus status;
985 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
986 "HANGUP message received for non-existing line, dropping channel.\n");
987 return GNUNET_SYSERR;
991 hup.header.size = htons (sizeof (hup));
992 hup.header.type = htons (GNUNET_MESSAGE_TYPE_CONVERSATION_CS_PHONE_HANG_UP);
995 GNUNET_MESH_receive_done (channel);
996 destroy_line_mesh_channels (ch);
999 case CS_CALLEE_RINGING:
1000 case CS_CALLEE_CONNECTED:
1002 case CS_CALLEE_SHUTDOWN:
1004 case CS_CALLER_CALLING:
1005 case CS_CALLER_CONNECTED:
1007 case CS_CALLER_SHUTDOWN:
1010 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1011 "Sending HANG UP message to client\n");
1012 GNUNET_SERVER_notification_context_unicast (nc,
1021 * Function to handle a pickup message incoming over mesh
1023 * @param cls closure, NULL
1024 * @param channel the channel over which the message arrived
1025 * @param channel_ctx the channel context, can be NULL
1026 * or point to the `struct Channel`
1027 * @param message the incoming message
1028 * @return #GNUNET_OK
1031 handle_mesh_pickup_message (void *cls,
1032 struct GNUNET_MESH_Channel *channel,
1034 const struct GNUNET_MessageHeader *message)
1036 struct Channel *ch = *channel_ctx;
1038 struct ClientPhonePickupMessage pick;
1042 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1043 "PICKUP message received for non-existing channel, dropping channel.\n");
1044 return GNUNET_SYSERR;
1047 GNUNET_MESH_receive_done (channel);
1050 case CS_CALLEE_RINGING:
1051 case CS_CALLEE_CONNECTED:
1052 GNUNET_break_op (0);
1053 destroy_line_mesh_channels (ch);
1054 return GNUNET_SYSERR;
1055 case CS_CALLEE_SHUTDOWN:
1056 GNUNET_break_op (0);
1057 destroy_line_mesh_channels (ch);
1059 case CS_CALLER_CALLING:
1060 ch->status = CS_CALLER_CONNECTED;
1062 case CS_CALLER_CONNECTED:
1063 GNUNET_break_op (0);
1065 case CS_CALLER_SHUTDOWN:
1066 GNUNET_break_op (0);
1067 mq_done_finish_caller_shutdown (ch);
1068 return GNUNET_SYSERR;
1070 pick.header.size = htons (sizeof (pick));
1071 pick.header.type = htons (GNUNET_MESSAGE_TYPE_CONVERSATION_CS_PHONE_PICKED_UP);
1073 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1074 "Sending PICKED UP message to client\n");
1075 GNUNET_SERVER_notification_context_unicast (nc,
1079 ch->channel_unreliable = GNUNET_MESH_channel_create (mesh,
1082 GNUNET_APPLICATION_TYPE_CONVERSATION_AUDIO,
1083 GNUNET_MESH_OPTION_DEFAULT);
1084 if (NULL == ch->channel_unreliable)
1093 * Function to handle a suspend message incoming over mesh
1095 * @param cls closure, NULL
1096 * @param channel the channel over which the message arrived
1097 * @param channel_ctx the channel context, can be NULL
1098 * or point to the `struct Channel`
1099 * @param message the incoming message
1100 * @return #GNUNET_OK
1103 handle_mesh_suspend_message (void *cls,
1104 struct GNUNET_MESH_Channel *channel,
1106 const struct GNUNET_MessageHeader *message)
1108 struct Channel *ch = *channel_ctx;
1110 struct ClientPhoneSuspendMessage suspend;
1114 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1115 "SUSPEND message received for non-existing line, dropping channel.\n");
1116 return GNUNET_SYSERR;
1119 suspend.header.size = htons (sizeof (suspend));
1120 suspend.header.type = htons (GNUNET_MESSAGE_TYPE_CONVERSATION_CS_PHONE_SUSPEND);
1121 suspend.cid = ch->cid;
1122 GNUNET_MESH_receive_done (channel);
1123 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1124 "Suspending channel CID: %u(%u:%u)\n",
1125 ch->cid, ch->remote_line, line->local_line);
1128 case CS_CALLEE_RINGING:
1129 GNUNET_break_op (0);
1131 case CS_CALLEE_CONNECTED:
1132 ch->suspended_remote = GNUNET_YES;
1134 case CS_CALLEE_SHUTDOWN:
1136 case CS_CALLER_CALLING:
1137 GNUNET_break_op (0);
1139 case CS_CALLER_CONNECTED:
1140 ch->suspended_remote = GNUNET_YES;
1142 case CS_CALLER_SHUTDOWN:
1145 GNUNET_SERVER_notification_context_unicast (nc,
1154 * Function to handle a resume message incoming over mesh
1156 * @param cls closure, NULL
1157 * @param channel the channel over which the message arrived
1158 * @param channel_ctx the channel context, can be NULL
1159 * or point to the `struct Channel`
1160 * @param message the incoming message
1161 * @return #GNUNET_OK
1164 handle_mesh_resume_message (void *cls,
1165 struct GNUNET_MESH_Channel *channel,
1167 const struct GNUNET_MessageHeader *message)
1169 struct Channel *ch = *channel_ctx;
1171 struct ClientPhoneResumeMessage resume;
1175 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1176 "RESUME message received for non-existing line, dropping channel.\n");
1177 return GNUNET_SYSERR;
1180 resume.header.size = htons (sizeof (resume));
1181 resume.header.type = htons (GNUNET_MESSAGE_TYPE_CONVERSATION_CS_PHONE_RESUME);
1182 resume.cid = ch->cid;
1183 GNUNET_MESH_receive_done (channel);
1184 if (GNUNET_YES != ch->suspended_remote)
1186 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1187 "RESUME message received for non-suspended channel, dropping channel.\n");
1188 return GNUNET_SYSERR;
1192 case CS_CALLEE_RINGING:
1195 case CS_CALLEE_CONNECTED:
1196 ch->suspended_remote = GNUNET_NO;
1198 case CS_CALLEE_SHUTDOWN:
1200 case CS_CALLER_CALLING:
1203 case CS_CALLER_CONNECTED:
1204 ch->suspended_remote = GNUNET_NO;
1206 case CS_CALLER_SHUTDOWN:
1209 GNUNET_SERVER_notification_context_unicast (nc,
1218 * Function to handle an audio message incoming over mesh
1220 * @param cls closure, NULL
1221 * @param channel the channel over which the message arrived
1222 * @param channel_ctx the channel context, can be NULL
1223 * or point to the `struct Channel`
1224 * @param message the incoming message
1225 * @return #GNUNET_OK
1228 handle_mesh_audio_message (void *cls,
1229 struct GNUNET_MESH_Channel *channel,
1231 const struct GNUNET_MessageHeader *message)
1233 const struct MeshAudioMessage *msg;
1234 struct Channel *ch = *channel_ctx;
1236 struct GNUNET_PeerIdentity sender;
1237 size_t msize = ntohs (message->size) - sizeof (struct MeshAudioMessage);
1238 char buf[msize + sizeof (struct ClientAudioMessage)];
1239 struct ClientAudioMessage *cam;
1240 const union GNUNET_MESH_ChannelInfo *info;
1242 msg = (const struct MeshAudioMessage *) message;
1245 info = GNUNET_MESH_channel_get_info (channel,
1246 GNUNET_MESH_OPTION_PEER);
1252 sender = info->peer;
1253 for (line = lines_head; NULL != line; line = line->next)
1254 if (line->local_line == ntohl (msg->remote_line))
1256 for (ch = line->channel_head; NULL != ch; ch = ch->next)
1258 if ( (CS_CALLEE_CONNECTED == ch->status) &&
1259 (0 == memcmp (&ch->target,
1261 sizeof (struct GNUNET_PeerIdentity))) &&
1262 (NULL == ch->channel_unreliable) )
1269 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1270 "Received %u bytes of AUDIO data for non-existing line %u, dropping.\n",
1271 msize, ntohl (msg->remote_line));
1272 return GNUNET_SYSERR;
1276 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1277 "Received %u bytes of AUDIO data for unknown sender.\n",
1279 return GNUNET_SYSERR;
1281 if ((GNUNET_YES == ch->suspended_local) || (GNUNET_YES == ch->suspended_remote))
1283 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1284 "Received %u bytes of AUDIO data on suspended channel CID %u:(%u:%u); dropping\n",
1285 msize, ch->cid, ch->remote_line, line->local_line);
1288 ch->channel_unreliable = channel;
1291 GNUNET_break (ch->line->local_line == ntohl (msg->remote_line));
1292 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1293 "Forwarding %u bytes of AUDIO data to client CID %u:(%u:%u)\n",
1294 msize, ch->cid, ch->remote_line, ch->line->local_line);
1295 cam = (struct ClientAudioMessage *) buf;
1296 cam->header.size = htons (sizeof (buf));
1297 cam->header.type = htons (GNUNET_MESSAGE_TYPE_CONVERSATION_CS_AUDIO);
1299 memcpy (&cam[1], &msg[1], msize);
1300 GNUNET_SERVER_notification_context_unicast (nc,
1304 GNUNET_MESH_receive_done (channel);
1310 * Method called whenever another peer has added us to a channel
1311 * the other peer initiated.
1313 * @param cls closure
1314 * @param channel new handle to the channel
1315 * @param initiator peer that started the channel
1317 * @param options channel option flags
1318 * @return initial channel context for the channel;
1319 * (can be NULL -- that's not an error)
1322 inbound_channel (void *cls,
1323 struct GNUNET_MESH_Channel *channel,
1324 const struct GNUNET_PeerIdentity *initiator,
1325 uint32_t port, enum GNUNET_MESH_ChannelOption options)
1327 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1328 _("Received incoming channel on port %u\n"),
1329 (unsigned int) port);
1335 * Function called whenever an inbound channel is destroyed. Should clean up
1336 * any associated state.
1338 * @param cls closure (set from #GNUNET_MESH_connect)
1339 * @param channel connection to the other end (henceforth invalid)
1340 * @param channel_ctx place where local state associated
1341 * with the channel is stored;
1342 * may point to the `struct Channel`
1345 inbound_end (void *cls,
1346 const struct GNUNET_MESH_Channel *channel,
1349 struct Channel *ch = channel_ctx;
1351 struct ClientPhoneHangupMessage hup;
1355 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1356 "Mesh channel destroyed, but channel is unknown to us\n");
1360 if (ch->channel_unreliable == channel)
1362 if (NULL != ch->unreliable_mth)
1364 GNUNET_MESH_notify_transmit_ready_cancel (ch->unreliable_mth);
1365 ch->unreliable_mth = NULL;
1367 ch->channel_unreliable = NULL;
1368 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1369 "Unreliable channel destroyed\n");
1372 if (ch->channel_reliable != channel)
1374 /* recursive call, I'm the one destroying 'ch' right now */
1377 ch->channel_reliable = NULL;
1379 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1380 "Mesh channel destroyed by mesh in state %d\n",
1382 hup.header.size = htons (sizeof (hup));
1383 hup.header.type = htons (GNUNET_MESSAGE_TYPE_CONVERSATION_CS_PHONE_HANG_UP);
1387 case CS_CALLEE_RINGING:
1388 case CS_CALLEE_CONNECTED:
1389 GNUNET_SERVER_notification_context_unicast (nc,
1394 case CS_CALLEE_SHUTDOWN:
1396 case CS_CALLER_CALLING:
1397 case CS_CALLER_CONNECTED:
1398 GNUNET_SERVER_notification_context_unicast (nc,
1403 case CS_CALLER_SHUTDOWN:
1406 destroy_line_mesh_channels (ch);
1411 * A client disconnected. Remove all of its data structure entries.
1413 * @param cls closure, NULL
1414 * @param client identification of the client
1417 handle_client_disconnect (void *cls,
1418 struct GNUNET_SERVER_Client *client)
1424 line = GNUNET_SERVER_client_get_user_context (client, struct Line);
1427 GNUNET_SERVER_client_set_user_context (client, (void *)NULL);
1428 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1429 "Client disconnected, closing line\n");
1430 GNUNET_CONTAINER_DLL_remove (lines_head,
1433 while (NULL != line->channel_head)
1434 destroy_line_mesh_channels (line->channel_head);
1442 * @param cls closure, NULL
1443 * @param tc the task context
1446 do_shutdown (void *cls,
1447 const struct GNUNET_SCHEDULER_TaskContext *tc)
1452 while (NULL != (line = lines_head))
1454 while (NULL != (ch = line->channel_head))
1455 destroy_line_mesh_channels (ch);
1456 GNUNET_CONTAINER_DLL_remove (lines_head,
1459 GNUNET_SERVER_client_set_user_context (line->client, (void *) NULL);
1464 GNUNET_MESH_disconnect (mesh);
1469 GNUNET_SERVER_notification_context_destroy (nc);
1476 * Main function that will be run by the scheduler.
1478 * @param cls closure
1479 * @param server server handle
1480 * @param c configuration
1484 struct GNUNET_SERVER_Handle *server,
1485 const struct GNUNET_CONFIGURATION_Handle *c)
1487 static const struct GNUNET_SERVER_MessageHandler server_handlers[] = {
1488 {&handle_client_register_message, NULL,
1489 GNUNET_MESSAGE_TYPE_CONVERSATION_CS_PHONE_REGISTER,
1490 sizeof (struct ClientPhoneRegisterMessage)},
1491 {&handle_client_pickup_message, NULL,
1492 GNUNET_MESSAGE_TYPE_CONVERSATION_CS_PHONE_PICK_UP,
1493 sizeof (struct ClientPhonePickupMessage) },
1494 {&handle_client_suspend_message, NULL,
1495 GNUNET_MESSAGE_TYPE_CONVERSATION_CS_PHONE_SUSPEND,
1496 sizeof (struct ClientPhoneSuspendMessage) },
1497 {&handle_client_resume_message, NULL,
1498 GNUNET_MESSAGE_TYPE_CONVERSATION_CS_PHONE_RESUME,
1499 sizeof (struct ClientPhoneResumeMessage) },
1500 {&handle_client_hangup_message, NULL,
1501 GNUNET_MESSAGE_TYPE_CONVERSATION_CS_PHONE_HANG_UP,
1502 sizeof (struct ClientPhoneHangupMessage) },
1503 {&handle_client_call_message, NULL,
1504 GNUNET_MESSAGE_TYPE_CONVERSATION_CS_PHONE_CALL,
1505 sizeof (struct ClientCallMessage) },
1506 {&handle_client_audio_message, NULL,
1507 GNUNET_MESSAGE_TYPE_CONVERSATION_CS_AUDIO,
1511 static struct GNUNET_MESH_MessageHandler mesh_handlers[] = {
1512 {&handle_mesh_ring_message,
1513 GNUNET_MESSAGE_TYPE_CONVERSATION_MESH_PHONE_RING,
1514 sizeof (struct MeshPhoneRingMessage)},
1515 {&handle_mesh_hangup_message,
1516 GNUNET_MESSAGE_TYPE_CONVERSATION_MESH_PHONE_HANG_UP,
1517 sizeof (struct MeshPhoneHangupMessage)},
1518 {&handle_mesh_pickup_message,
1519 GNUNET_MESSAGE_TYPE_CONVERSATION_MESH_PHONE_PICK_UP,
1520 sizeof (struct MeshPhonePickupMessage)},
1521 {&handle_mesh_suspend_message,
1522 GNUNET_MESSAGE_TYPE_CONVERSATION_MESH_PHONE_SUSPEND,
1523 sizeof (struct MeshPhoneSuspendMessage)},
1524 {&handle_mesh_resume_message,
1525 GNUNET_MESSAGE_TYPE_CONVERSATION_MESH_PHONE_RESUME,
1526 sizeof (struct MeshPhoneResumeMessage)},
1527 {&handle_mesh_audio_message, GNUNET_MESSAGE_TYPE_CONVERSATION_MESH_AUDIO,
1531 static uint32_t ports[] = {
1532 GNUNET_APPLICATION_TYPE_CONVERSATION_CONTROL,
1533 GNUNET_APPLICATION_TYPE_CONVERSATION_AUDIO,
1538 GNUNET_assert (GNUNET_OK ==
1539 GNUNET_CRYPTO_get_peer_identity (cfg,
1541 mesh = GNUNET_MESH_connect (cfg,
1551 GNUNET_SCHEDULER_shutdown ();
1554 nc = GNUNET_SERVER_notification_context_create (server, 16);
1555 GNUNET_SERVER_add_handlers (server, server_handlers);
1556 GNUNET_SERVER_disconnect_notify (server, &handle_client_disconnect, NULL);
1557 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL,
1564 * The main function for the conversation service.
1566 * @param argc number of arguments from the command line
1567 * @param argv command line arguments
1568 * @return 0 ok, 1 on error
1574 return (GNUNET_OK ==
1575 GNUNET_SERVICE_run (argc, argv,
1577 GNUNET_SERVICE_OPTION_NONE,
1578 &run, NULL)) ? 0 : 1;
1581 /* end of gnunet-service-conversation.c */