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 mam->source_line = htonl (ch->line->local_line);
757 memcpy (&mam[1], ch->audio_data, ch->audio_size);
758 GNUNET_free (ch->audio_data);
759 ch->audio_data = NULL;
760 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
761 "Sending %u bytes of audio data from line %u to remote line %u via mesh\n",
762 ch->audio_size, ch->line->local_line, ch->remote_line);
763 return sizeof (struct MeshAudioMessage) + ch->audio_size;
768 * Function to handle audio data from the client
770 * @param cls closure, NULL
771 * @param client the client from which the message is
772 * @param message the message from the client
775 handle_client_audio_message (void *cls,
776 struct GNUNET_SERVER_Client *client,
777 const struct GNUNET_MessageHeader *message)
779 const struct ClientAudioMessage *msg;
784 size = ntohs (message->size) - sizeof (struct ClientAudioMessage);
785 msg = (const struct ClientAudioMessage *) message;
786 line = GNUNET_SERVER_client_get_user_context (client, struct Line);
790 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
793 for (ch = line->channel_head; NULL != ch; ch = ch->next)
794 if (msg->cid == ch->cid)
798 /* could have been destroyed asynchronously, ignore message */
799 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
800 "Channel %u not found\n",
807 case CS_CALLEE_RINGING:
808 case CS_CALLER_CALLING:
810 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
812 case CS_CALLEE_CONNECTED:
813 case CS_CALLER_CONNECTED:
814 /* common case, handled below */
816 case CS_CALLEE_SHUTDOWN:
817 case CS_CALLER_SHUTDOWN:
818 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
819 "Mesh audio channel in shutdown; audio data dropped\n");
820 GNUNET_SERVER_receive_done (client, GNUNET_OK);
823 if (GNUNET_YES == ch->suspended_local)
825 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "This channel is suspended locally\n");
826 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
829 if (NULL == ch->channel_unreliable)
831 GNUNET_log (GNUNET_ERROR_TYPE_INFO | GNUNET_ERROR_TYPE_BULK,
832 _("Mesh audio channel not ready; audio data dropped\n"));
833 GNUNET_SERVER_receive_done (client, GNUNET_OK);
836 if (NULL != ch->unreliable_mth)
838 /* NOTE: we may want to not do this and instead combine the data */
839 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
840 "Bandwidth insufficient; dropping previous audio data segment with %u bytes\n",
841 (unsigned int) ch->audio_size);
842 GNUNET_MESH_notify_transmit_ready_cancel (ch->unreliable_mth);
843 ch->unreliable_mth = NULL;
844 GNUNET_free (ch->audio_data);
845 ch->audio_data = NULL;
847 ch->audio_size = size;
848 ch->audio_data = GNUNET_malloc (ch->audio_size);
849 memcpy (ch->audio_data,
852 ch->unreliable_mth = GNUNET_MESH_notify_transmit_ready (ch->channel_unreliable,
854 GNUNET_TIME_UNIT_FOREVER_REL,
855 sizeof (struct MeshAudioMessage)
857 &transmit_line_audio,
859 GNUNET_SERVER_receive_done (client, GNUNET_OK);
864 * We are done signalling shutdown to the other peer.
865 * Destroy the channel.
867 * @param cls the `struct GNUNET_MESH_channel` to destroy
870 mq_done_destroy_channel (void *cls)
872 struct GNUNET_MESH_Channel *channel = cls;
874 GNUNET_MESH_channel_destroy (channel);
879 * Function to handle a ring message incoming over mesh
881 * @param cls closure, NULL
882 * @param channel the channel over which the message arrived
883 * @param channel_ctx the channel context, can be NULL
884 * or point to the `struct Channel`
885 * @param message the incoming message
889 handle_mesh_ring_message (void *cls,
890 struct GNUNET_MESH_Channel *channel,
892 const struct GNUNET_MessageHeader *message)
894 const struct MeshPhoneRingMessage *msg;
897 struct GNUNET_MQ_Envelope *e;
898 struct MeshPhoneHangupMessage *hang_up;
899 struct ClientPhoneRingMessage cring;
900 struct GNUNET_MQ_Handle *reliable_mq;
902 msg = (const struct MeshPhoneRingMessage *) message;
903 if ( (msg->purpose.size != htonl (sizeof (struct GNUNET_PeerIdentity) * 2 +
904 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
905 sizeof (struct GNUNET_CRYPTO_EccSignaturePurpose) +
906 sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey))) ||
908 GNUNET_CRYPTO_ecdsa_verify (GNUNET_SIGNATURE_PURPOSE_CONVERSATION_RING,
914 return GNUNET_SYSERR;
916 for (line = lines_head; NULL != line; line = line->next)
917 if (line->local_line == ntohl (msg->remote_line))
921 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
922 _("No available phone for incoming call on line %u, sending HANG_UP signal\n"),
923 ntohl (msg->remote_line));
924 e = GNUNET_MQ_msg (hang_up,
925 GNUNET_MESSAGE_TYPE_CONVERSATION_MESH_PHONE_HANG_UP);
926 GNUNET_MQ_notify_sent (e,
927 &mq_done_destroy_channel,
929 reliable_mq = GNUNET_MESH_mq_create (channel);
930 GNUNET_MQ_send (reliable_mq, e);
931 /* FIXME: do we need to clean up reliable_mq somehow/somewhere? */
932 GNUNET_MESH_receive_done (channel); /* needed? */
935 ch = GNUNET_new (struct Channel);
937 GNUNET_CONTAINER_DLL_insert (line->channel_head,
940 ch->status = CS_CALLEE_RINGING;
941 ch->remote_line = ntohl (msg->source_line);
942 ch->channel_reliable = channel;
943 ch->reliable_mq = GNUNET_MESH_mq_create (ch->channel_reliable);
944 ch->cid = line->cid_gen++;
945 ch->target = msg->source;
947 cring.header.type = htons (GNUNET_MESSAGE_TYPE_CONVERSATION_CS_PHONE_RING);
948 cring.header.size = htons (sizeof (cring));
950 cring.caller_id = msg->caller_id;
951 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
952 "Sending RING message to client. CID %u:(%u, %u)\n",
953 ch->cid, ch->remote_line, line->local_line);
954 GNUNET_SERVER_notification_context_unicast (nc,
958 GNUNET_MESH_receive_done (channel);
964 * Function to handle a hangup message incoming over mesh
966 * @param cls closure, NULL
967 * @param channel the channel over which the message arrived
968 * @param channel_ctx the channel context, can be NULL
969 * or point to the `struct Channel`
970 * @param message the incoming message
974 handle_mesh_hangup_message (void *cls,
975 struct GNUNET_MESH_Channel *channel,
977 const struct GNUNET_MessageHeader *message)
979 struct Channel *ch = *channel_ctx;
981 struct ClientPhoneHangupMessage hup;
982 enum ChannelStatus status;
986 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
987 "HANGUP message received for non-existing line, dropping channel.\n");
988 return GNUNET_SYSERR;
992 hup.header.size = htons (sizeof (hup));
993 hup.header.type = htons (GNUNET_MESSAGE_TYPE_CONVERSATION_CS_PHONE_HANG_UP);
996 GNUNET_MESH_receive_done (channel);
997 destroy_line_mesh_channels (ch);
1000 case CS_CALLEE_RINGING:
1001 case CS_CALLEE_CONNECTED:
1003 case CS_CALLEE_SHUTDOWN:
1005 case CS_CALLER_CALLING:
1006 case CS_CALLER_CONNECTED:
1008 case CS_CALLER_SHUTDOWN:
1011 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1012 "Sending HANG UP message to client\n");
1013 GNUNET_SERVER_notification_context_unicast (nc,
1022 * Function to handle a pickup message incoming over mesh
1024 * @param cls closure, NULL
1025 * @param channel the channel over which the message arrived
1026 * @param channel_ctx the channel context, can be NULL
1027 * or point to the `struct Channel`
1028 * @param message the incoming message
1029 * @return #GNUNET_OK
1032 handle_mesh_pickup_message (void *cls,
1033 struct GNUNET_MESH_Channel *channel,
1035 const struct GNUNET_MessageHeader *message)
1037 struct Channel *ch = *channel_ctx;
1039 struct ClientPhonePickupMessage pick;
1043 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1044 "PICKUP message received for non-existing channel, dropping channel.\n");
1045 return GNUNET_SYSERR;
1048 GNUNET_MESH_receive_done (channel);
1051 case CS_CALLEE_RINGING:
1052 case CS_CALLEE_CONNECTED:
1053 GNUNET_break_op (0);
1054 destroy_line_mesh_channels (ch);
1055 return GNUNET_SYSERR;
1056 case CS_CALLEE_SHUTDOWN:
1057 GNUNET_break_op (0);
1058 destroy_line_mesh_channels (ch);
1060 case CS_CALLER_CALLING:
1061 ch->status = CS_CALLER_CONNECTED;
1063 case CS_CALLER_CONNECTED:
1064 GNUNET_break_op (0);
1066 case CS_CALLER_SHUTDOWN:
1067 GNUNET_break_op (0);
1068 mq_done_finish_caller_shutdown (ch);
1069 return GNUNET_SYSERR;
1071 pick.header.size = htons (sizeof (pick));
1072 pick.header.type = htons (GNUNET_MESSAGE_TYPE_CONVERSATION_CS_PHONE_PICKED_UP);
1074 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1075 "Sending PICKED UP message to client\n");
1076 GNUNET_SERVER_notification_context_unicast (nc,
1080 ch->channel_unreliable = GNUNET_MESH_channel_create (mesh,
1083 GNUNET_APPLICATION_TYPE_CONVERSATION_AUDIO,
1084 GNUNET_MESH_OPTION_DEFAULT);
1085 if (NULL == ch->channel_unreliable)
1094 * Function to handle a suspend message incoming over mesh
1096 * @param cls closure, NULL
1097 * @param channel the channel over which the message arrived
1098 * @param channel_ctx the channel context, can be NULL
1099 * or point to the `struct Channel`
1100 * @param message the incoming message
1101 * @return #GNUNET_OK
1104 handle_mesh_suspend_message (void *cls,
1105 struct GNUNET_MESH_Channel *channel,
1107 const struct GNUNET_MessageHeader *message)
1109 struct Channel *ch = *channel_ctx;
1111 struct ClientPhoneSuspendMessage suspend;
1115 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1116 "SUSPEND message received for non-existing line, dropping channel.\n");
1117 return GNUNET_SYSERR;
1120 suspend.header.size = htons (sizeof (suspend));
1121 suspend.header.type = htons (GNUNET_MESSAGE_TYPE_CONVERSATION_CS_PHONE_SUSPEND);
1122 suspend.cid = ch->cid;
1123 GNUNET_MESH_receive_done (channel);
1124 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1125 "Suspending channel CID: %u(%u:%u)\n",
1126 ch->cid, ch->remote_line, line->local_line);
1129 case CS_CALLEE_RINGING:
1130 GNUNET_break_op (0);
1132 case CS_CALLEE_CONNECTED:
1133 ch->suspended_remote = GNUNET_YES;
1135 case CS_CALLEE_SHUTDOWN:
1137 case CS_CALLER_CALLING:
1138 GNUNET_break_op (0);
1140 case CS_CALLER_CONNECTED:
1141 ch->suspended_remote = GNUNET_YES;
1143 case CS_CALLER_SHUTDOWN:
1146 GNUNET_SERVER_notification_context_unicast (nc,
1155 * Function to handle a resume message incoming over mesh
1157 * @param cls closure, NULL
1158 * @param channel the channel over which the message arrived
1159 * @param channel_ctx the channel context, can be NULL
1160 * or point to the `struct Channel`
1161 * @param message the incoming message
1162 * @return #GNUNET_OK
1165 handle_mesh_resume_message (void *cls,
1166 struct GNUNET_MESH_Channel *channel,
1168 const struct GNUNET_MessageHeader *message)
1170 struct Channel *ch = *channel_ctx;
1172 struct ClientPhoneResumeMessage resume;
1176 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1177 "RESUME message received for non-existing line, dropping channel.\n");
1178 return GNUNET_SYSERR;
1181 resume.header.size = htons (sizeof (resume));
1182 resume.header.type = htons (GNUNET_MESSAGE_TYPE_CONVERSATION_CS_PHONE_RESUME);
1183 resume.cid = ch->cid;
1184 GNUNET_MESH_receive_done (channel);
1185 if (GNUNET_YES != ch->suspended_remote)
1187 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1188 "RESUME message received for non-suspended channel, dropping channel.\n");
1189 return GNUNET_SYSERR;
1193 case CS_CALLEE_RINGING:
1196 case CS_CALLEE_CONNECTED:
1197 ch->suspended_remote = GNUNET_NO;
1199 case CS_CALLEE_SHUTDOWN:
1201 case CS_CALLER_CALLING:
1204 case CS_CALLER_CONNECTED:
1205 ch->suspended_remote = GNUNET_NO;
1207 case CS_CALLER_SHUTDOWN:
1210 GNUNET_SERVER_notification_context_unicast (nc,
1219 * Function to handle an audio message incoming over mesh
1221 * @param cls closure, NULL
1222 * @param channel the channel over which the message arrived
1223 * @param channel_ctx the channel context, can be NULL
1224 * or point to the `struct Channel`
1225 * @param message the incoming message
1226 * @return #GNUNET_OK
1229 handle_mesh_audio_message (void *cls,
1230 struct GNUNET_MESH_Channel *channel,
1232 const struct GNUNET_MessageHeader *message)
1234 const struct MeshAudioMessage *msg;
1235 struct Channel *ch = *channel_ctx;
1237 struct GNUNET_PeerIdentity sender;
1238 size_t msize = ntohs (message->size) - sizeof (struct MeshAudioMessage);
1239 char buf[msize + sizeof (struct ClientAudioMessage)];
1240 struct ClientAudioMessage *cam;
1241 const union GNUNET_MESH_ChannelInfo *info;
1243 msg = (const struct MeshAudioMessage *) message;
1246 info = GNUNET_MESH_channel_get_info (channel,
1247 GNUNET_MESH_OPTION_PEER);
1253 sender = info->peer;
1254 for (line = lines_head; NULL != line; line = line->next)
1255 if (line->local_line == ntohl (msg->remote_line))
1257 for (ch = line->channel_head; NULL != ch; ch = ch->next)
1259 if ( (CS_CALLEE_CONNECTED == ch->status) &&
1260 (0 == memcmp (&ch->target,
1262 sizeof (struct GNUNET_PeerIdentity))) &&
1263 (NULL == ch->channel_unreliable) &&
1264 (ch->remote_line == ntohl (msg->source_line)) )
1271 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1272 "Received %u bytes of AUDIO data for non-existing line %u, dropping.\n",
1273 msize, ntohl (msg->remote_line));
1274 return GNUNET_SYSERR;
1278 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1279 "Received %u bytes of AUDIO data for unknown sender.\n",
1281 return GNUNET_SYSERR;
1283 if ((GNUNET_YES == ch->suspended_local) || (GNUNET_YES == ch->suspended_remote))
1285 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1286 "Received %u bytes of AUDIO data on suspended channel CID %u:(%u:%u); dropping\n",
1287 msize, ch->cid, ch->remote_line, line->local_line);
1290 ch->channel_unreliable = channel;
1293 GNUNET_break (ch->line->local_line == ntohl (msg->remote_line));
1294 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1295 "Forwarding %u bytes of AUDIO data to client CID %u:(%u:%u)\n",
1296 msize, ch->cid, ch->remote_line, ch->line->local_line);
1297 cam = (struct ClientAudioMessage *) buf;
1298 cam->header.size = htons (sizeof (buf));
1299 cam->header.type = htons (GNUNET_MESSAGE_TYPE_CONVERSATION_CS_AUDIO);
1301 memcpy (&cam[1], &msg[1], msize);
1302 GNUNET_SERVER_notification_context_unicast (nc,
1306 GNUNET_MESH_receive_done (channel);
1312 * Method called whenever another peer has added us to a channel
1313 * the other peer initiated.
1315 * @param cls closure
1316 * @param channel new handle to the channel
1317 * @param initiator peer that started the channel
1319 * @param options channel option flags
1320 * @return initial channel context for the channel;
1321 * (can be NULL -- that's not an error)
1324 inbound_channel (void *cls,
1325 struct GNUNET_MESH_Channel *channel,
1326 const struct GNUNET_PeerIdentity *initiator,
1327 uint32_t port, enum GNUNET_MESH_ChannelOption options)
1329 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1330 _("Received incoming channel on port %u\n"),
1331 (unsigned int) port);
1337 * Function called whenever an inbound channel is destroyed. Should clean up
1338 * any associated state.
1340 * @param cls closure (set from #GNUNET_MESH_connect)
1341 * @param channel connection to the other end (henceforth invalid)
1342 * @param channel_ctx place where local state associated
1343 * with the channel is stored;
1344 * may point to the `struct Channel`
1347 inbound_end (void *cls,
1348 const struct GNUNET_MESH_Channel *channel,
1351 struct Channel *ch = channel_ctx;
1353 struct ClientPhoneHangupMessage hup;
1357 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1358 "Mesh channel destroyed, but channel is unknown to us\n");
1362 if (ch->channel_unreliable == channel)
1364 if (NULL != ch->unreliable_mth)
1366 GNUNET_MESH_notify_transmit_ready_cancel (ch->unreliable_mth);
1367 ch->unreliable_mth = NULL;
1369 ch->channel_unreliable = NULL;
1370 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1371 "Unreliable channel destroyed\n");
1374 if (ch->channel_reliable != channel)
1376 /* recursive call, I'm the one destroying 'ch' right now */
1379 ch->channel_reliable = NULL;
1381 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1382 "Mesh channel destroyed by mesh in state %d\n",
1384 hup.header.size = htons (sizeof (hup));
1385 hup.header.type = htons (GNUNET_MESSAGE_TYPE_CONVERSATION_CS_PHONE_HANG_UP);
1389 case CS_CALLEE_RINGING:
1390 case CS_CALLEE_CONNECTED:
1391 GNUNET_SERVER_notification_context_unicast (nc,
1396 case CS_CALLEE_SHUTDOWN:
1398 case CS_CALLER_CALLING:
1399 case CS_CALLER_CONNECTED:
1400 GNUNET_SERVER_notification_context_unicast (nc,
1405 case CS_CALLER_SHUTDOWN:
1408 destroy_line_mesh_channels (ch);
1413 * A client disconnected. Remove all of its data structure entries.
1415 * @param cls closure, NULL
1416 * @param client identification of the client
1419 handle_client_disconnect (void *cls,
1420 struct GNUNET_SERVER_Client *client)
1426 line = GNUNET_SERVER_client_get_user_context (client, struct Line);
1429 GNUNET_SERVER_client_set_user_context (client, (void *)NULL);
1430 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1431 "Client disconnected, closing line\n");
1432 GNUNET_CONTAINER_DLL_remove (lines_head,
1435 while (NULL != line->channel_head)
1436 destroy_line_mesh_channels (line->channel_head);
1444 * @param cls closure, NULL
1445 * @param tc the task context
1448 do_shutdown (void *cls,
1449 const struct GNUNET_SCHEDULER_TaskContext *tc)
1454 while (NULL != (line = lines_head))
1456 while (NULL != (ch = line->channel_head))
1457 destroy_line_mesh_channels (ch);
1458 GNUNET_CONTAINER_DLL_remove (lines_head,
1461 GNUNET_SERVER_client_set_user_context (line->client, (void *) NULL);
1466 GNUNET_MESH_disconnect (mesh);
1471 GNUNET_SERVER_notification_context_destroy (nc);
1478 * Main function that will be run by the scheduler.
1480 * @param cls closure
1481 * @param server server handle
1482 * @param c configuration
1486 struct GNUNET_SERVER_Handle *server,
1487 const struct GNUNET_CONFIGURATION_Handle *c)
1489 static const struct GNUNET_SERVER_MessageHandler server_handlers[] = {
1490 {&handle_client_register_message, NULL,
1491 GNUNET_MESSAGE_TYPE_CONVERSATION_CS_PHONE_REGISTER,
1492 sizeof (struct ClientPhoneRegisterMessage)},
1493 {&handle_client_pickup_message, NULL,
1494 GNUNET_MESSAGE_TYPE_CONVERSATION_CS_PHONE_PICK_UP,
1495 sizeof (struct ClientPhonePickupMessage) },
1496 {&handle_client_suspend_message, NULL,
1497 GNUNET_MESSAGE_TYPE_CONVERSATION_CS_PHONE_SUSPEND,
1498 sizeof (struct ClientPhoneSuspendMessage) },
1499 {&handle_client_resume_message, NULL,
1500 GNUNET_MESSAGE_TYPE_CONVERSATION_CS_PHONE_RESUME,
1501 sizeof (struct ClientPhoneResumeMessage) },
1502 {&handle_client_hangup_message, NULL,
1503 GNUNET_MESSAGE_TYPE_CONVERSATION_CS_PHONE_HANG_UP,
1504 sizeof (struct ClientPhoneHangupMessage) },
1505 {&handle_client_call_message, NULL,
1506 GNUNET_MESSAGE_TYPE_CONVERSATION_CS_PHONE_CALL,
1507 sizeof (struct ClientCallMessage) },
1508 {&handle_client_audio_message, NULL,
1509 GNUNET_MESSAGE_TYPE_CONVERSATION_CS_AUDIO,
1513 static struct GNUNET_MESH_MessageHandler mesh_handlers[] = {
1514 {&handle_mesh_ring_message,
1515 GNUNET_MESSAGE_TYPE_CONVERSATION_MESH_PHONE_RING,
1516 sizeof (struct MeshPhoneRingMessage)},
1517 {&handle_mesh_hangup_message,
1518 GNUNET_MESSAGE_TYPE_CONVERSATION_MESH_PHONE_HANG_UP,
1519 sizeof (struct MeshPhoneHangupMessage)},
1520 {&handle_mesh_pickup_message,
1521 GNUNET_MESSAGE_TYPE_CONVERSATION_MESH_PHONE_PICK_UP,
1522 sizeof (struct MeshPhonePickupMessage)},
1523 {&handle_mesh_suspend_message,
1524 GNUNET_MESSAGE_TYPE_CONVERSATION_MESH_PHONE_SUSPEND,
1525 sizeof (struct MeshPhoneSuspendMessage)},
1526 {&handle_mesh_resume_message,
1527 GNUNET_MESSAGE_TYPE_CONVERSATION_MESH_PHONE_RESUME,
1528 sizeof (struct MeshPhoneResumeMessage)},
1529 {&handle_mesh_audio_message, GNUNET_MESSAGE_TYPE_CONVERSATION_MESH_AUDIO,
1533 static uint32_t ports[] = {
1534 GNUNET_APPLICATION_TYPE_CONVERSATION_CONTROL,
1535 GNUNET_APPLICATION_TYPE_CONVERSATION_AUDIO,
1540 GNUNET_assert (GNUNET_OK ==
1541 GNUNET_CRYPTO_get_peer_identity (cfg,
1543 mesh = GNUNET_MESH_connect (cfg,
1553 GNUNET_SCHEDULER_shutdown ();
1556 nc = GNUNET_SERVER_notification_context_create (server, 16);
1557 GNUNET_SERVER_add_handlers (server, server_handlers);
1558 GNUNET_SERVER_disconnect_notify (server, &handle_client_disconnect, NULL);
1559 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL,
1566 * The main function for the conversation service.
1568 * @param argc number of arguments from the command line
1569 * @param argv command line arguments
1570 * @return 0 ok, 1 on error
1576 return (GNUNET_OK ==
1577 GNUNET_SERVICE_run (argc, argv,
1579 GNUNET_SERVICE_OPTION_NONE,
1580 &run, NULL)) ? 0 : 1;
1583 /* end of gnunet-service-conversation.c */