2 This file is part of GNUnet.
3 (C) 2008, 2011 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.
23 * @brief convenience API for sending and receiving chat messages
24 * @author Christian Grothoff
25 * @author Nathan Evans
26 * @author Vitaly Minko
30 #include "gnunet_constants.h"
31 #include "gnunet_protocols.h"
32 #include "gnunet_signatures.h"
35 #define DEBUG_CHAT GNUNET_EXTRA_LOGGING
36 #define NICK_IDENTITY_PREFIX ".chat_identity_"
40 * Handle for a chat room.
42 struct GNUNET_CHAT_Room
44 struct GNUNET_CLIENT_Connection *client;
46 const struct GNUNET_CONFIGURATION_Handle *cfg;
48 struct GNUNET_CONTAINER_MetaData *member_info;
52 struct GNUNET_CRYPTO_RsaPrivateKey *my_private_key;
54 struct MemberList *members;
58 GNUNET_CHAT_JoinCallback join_callback;
60 void *join_callback_cls;
62 GNUNET_CHAT_MessageCallback message_callback;
64 void *message_callback_cls;
66 GNUNET_CHAT_MemberListCallback member_list_callback;
68 void *member_list_callback_cls;
70 GNUNET_CHAT_MessageConfirmation confirmation_callback;
72 void *confirmation_cls;
74 uint32_t sequence_number;
81 * Linked list of members in the chat room.
85 struct MemberList *next;
88 * Description of the member.
90 struct GNUNET_CONTAINER_MetaData *meta;
93 * Member ID (pseudonym).
95 struct GNUNET_HashCode id;
100 * Context for transmitting a send-message request.
102 struct GNUNET_CHAT_SendMessageContext
105 * Handle for the chat room.
107 struct GNUNET_CHAT_Room *chat_room;
110 * Message that we're sending.
115 * Options for the message.
117 enum GNUNET_CHAT_MsgOptions options;
120 * Receiver of the message. NULL to send to everyone in the room.
122 const struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *receiver;
125 * Sequence id of the message.
127 uint32_t sequence_number;
132 * Context for transmitting a confirmation receipt.
134 struct GNUNET_CHAT_SendReceiptContext
137 * Handle for the chat room.
139 struct GNUNET_CHAT_Room *chat_room;
142 * The original message that we're going to acknowledge.
144 struct ReceiveNotificationMessage *received_msg;
149 * Ask client to send a join request.
152 rejoin_room (struct GNUNET_CHAT_Room *chat_room);
156 * Transmit a confirmation receipt to the chat service.
158 * @param cls closure, pointer to the 'struct GNUNET_CHAT_SendReceiptContext'
159 * @param size number of bytes available in buf
160 * @param buf where the callee should write the message
161 * @return number of bytes written to buf
164 transmit_acknowledge_request (void *cls, size_t size, void *buf)
166 struct GNUNET_CHAT_SendReceiptContext *src = cls;
167 struct ConfirmationReceiptMessage *receipt;
168 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded pub_key;
174 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
175 _("Could not transmit confirmation receipt\n"));
179 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
180 "Transmitting confirmation receipt to the service\n");
182 msg_size = sizeof (struct ConfirmationReceiptMessage);
183 GNUNET_assert (size >= msg_size);
185 receipt->header.size = htons (msg_size);
186 receipt->header.type = htons (GNUNET_MESSAGE_TYPE_CHAT_CONFIRMATION_RECEIPT);
187 receipt->reserved = htonl (0);
188 receipt->sequence_number = src->received_msg->sequence_number;
189 receipt->reserved2 = htonl (0);
190 receipt->timestamp = GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_get ());
191 GNUNET_CRYPTO_rsa_key_get_public (src->chat_room->my_private_key, &pub_key);
192 GNUNET_CRYPTO_hash (&pub_key,
193 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
195 receipt->author = src->received_msg->sender;
196 receipt->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_CHAT_RECEIPT);
197 receipt->purpose.size =
198 htonl (msg_size - sizeof (struct GNUNET_MessageHeader) -
199 sizeof (uint32_t) - sizeof (struct GNUNET_CRYPTO_RsaSignature));
201 ntohs (src->received_msg->header.size) -
202 sizeof (struct ReceiveNotificationMessage);
203 GNUNET_CRYPTO_hash (&src->received_msg[1], msg_len, &receipt->content);
204 GNUNET_assert (GNUNET_OK ==
205 GNUNET_CRYPTO_rsa_sign (src->chat_room->my_private_key,
207 &receipt->signature));
208 GNUNET_free (src->received_msg);
215 * Handles messages received from the service. Calls the proper client
219 process_result (struct GNUNET_CHAT_Room *room,
220 const struct GNUNET_MessageHeader *reply)
222 struct LeaveNotificationMessage *leave_msg;
223 struct JoinNotificationMessage *join_msg;
224 struct ReceiveNotificationMessage *received_msg;
225 struct ConfirmationReceiptMessage *receipt;
226 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded pkey;
227 struct GNUNET_HashCode id;
228 const struct GNUNET_HashCode *sender;
229 struct GNUNET_CONTAINER_MetaData *meta;
230 struct GNUNET_CHAT_SendReceiptContext *src;
231 struct MemberList *pos;
232 struct MemberList *prev;
233 struct GNUNET_CRYPTO_AesSessionKey key;
234 char decrypted_msg[MAX_MESSAGE_LENGTH];
238 char *message_content;
240 size = ntohs (reply->size);
241 switch (ntohs (reply->type))
243 case GNUNET_MESSAGE_TYPE_CHAT_JOIN_NOTIFICATION:
245 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got a join notification\n");
247 if (size < sizeof (struct JoinNotificationMessage))
252 join_msg = (struct JoinNotificationMessage *) reply;
253 meta_len = size - sizeof (struct JoinNotificationMessage);
255 GNUNET_CONTAINER_meta_data_deserialize ((const char *) &join_msg[1],
262 pos = GNUNET_malloc (sizeof (struct MemberList));
264 GNUNET_CRYPTO_hash (&join_msg->public_key,
265 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
267 GNUNET_PSEUDONYM_add (room->cfg, &pos->id, meta);
268 pos->next = room->members;
270 if (GNUNET_NO == room->is_joined)
272 GNUNET_CRYPTO_rsa_key_get_public (room->my_private_key, &pkey);
274 memcmp (&join_msg->public_key, &pkey,
275 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded)))
277 room->join_callback (room->join_callback_cls);
278 room->is_joined = GNUNET_YES;
282 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
283 _("The current user must be the the first one joined\n"));
289 room->member_list_callback (room->member_list_callback_cls, meta,
290 &join_msg->public_key,
291 ntohl (join_msg->msg_options));
293 case GNUNET_MESSAGE_TYPE_CHAT_LEAVE_NOTIFICATION:
295 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got a leave notification\n");
297 if (size < sizeof (struct LeaveNotificationMessage))
302 leave_msg = (struct LeaveNotificationMessage *) reply;
303 room->member_list_callback (room->member_list_callback_cls, NULL,
304 &leave_msg->user, GNUNET_CHAT_MSG_OPTION_NONE);
305 GNUNET_CRYPTO_hash (&leave_msg->user,
306 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
310 while ((NULL != pos) &&
311 (0 != memcmp (&pos->id, &id, sizeof (struct GNUNET_HashCode))))
316 GNUNET_assert (NULL != pos);
318 room->members = pos->next;
320 prev->next = pos->next;
321 GNUNET_CONTAINER_meta_data_destroy (pos->meta);
324 case GNUNET_MESSAGE_TYPE_CHAT_MESSAGE_NOTIFICATION:
326 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got a message notification\n");
328 if (size <= sizeof (struct ReceiveNotificationMessage))
333 received_msg = (struct ReceiveNotificationMessage *) reply;
334 if (0 != (ntohl (received_msg->msg_options) & GNUNET_CHAT_MSG_ACKNOWLEDGED))
336 src = GNUNET_malloc (sizeof (struct GNUNET_CHAT_SendReceiptContext));
337 src->chat_room = room;
338 src->received_msg = GNUNET_memdup (received_msg, size);
339 GNUNET_CLIENT_notify_transmit_ready (room->client,
341 ConfirmationReceiptMessage),
342 GNUNET_CONSTANTS_SERVICE_TIMEOUT,
344 &transmit_acknowledge_request, src);
346 msg_len = size - sizeof (struct ReceiveNotificationMessage);
347 if (0 != (ntohl (received_msg->msg_options) & GNUNET_CHAT_MSG_PRIVATE))
350 GNUNET_CRYPTO_rsa_decrypt (room->my_private_key,
351 &received_msg->encrypted_key, &key,
353 GNUNET_CRYPTO_AesSessionKey)))
359 GNUNET_CRYPTO_aes_decrypt (&received_msg[1], msg_len, &key,
361 GNUNET_CRYPTO_AesInitializationVector *)
362 INITVALUE, decrypted_msg);
363 message_content = decrypted_msg;
367 message_content = GNUNET_malloc (msg_len + 1);
368 memcpy (message_content, &received_msg[1], msg_len);
370 message_content[msg_len] = '\0';
371 if (0 != (ntohl (received_msg->msg_options) & GNUNET_CHAT_MSG_ANONYMOUS))
379 while ((NULL != pos) &&
381 memcmp (&pos->id, &received_msg->sender,
382 sizeof (struct GNUNET_HashCode))))
384 GNUNET_assert (NULL != pos);
385 sender = &received_msg->sender;
388 room->message_callback (room->message_callback_cls, room, sender, meta,
390 GNUNET_TIME_absolute_ntoh (received_msg->timestamp),
391 ntohl (received_msg->msg_options));
392 if (message_content != decrypted_msg)
393 GNUNET_free (message_content);
395 case GNUNET_MESSAGE_TYPE_CHAT_CONFIRMATION_NOTIFICATION:
397 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got a confirmation receipt\n");
399 if (size < sizeof (struct ConfirmationReceiptMessage))
404 receipt = (struct ConfirmationReceiptMessage *) reply;
405 if (NULL != room->confirmation_callback)
406 room->confirmation_callback (room->confirmation_cls, room,
407 ntohl (receipt->sequence_number),
408 GNUNET_TIME_absolute_ntoh
409 (receipt->timestamp), &receipt->target);
412 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, _("Unknown message type: '%u'\n"),
413 ntohs (reply->type));
421 * Listen for incoming messages on this chat room. Also, support servers going
422 * away/coming back (i.e. rejoin chat room to keep server state up to date).
424 * @param cls closure, pointer to the 'struct GNUNET_CHAT_Room'
425 * @param msg message received, NULL on timeout or fatal error
428 receive_results (void *cls, const struct GNUNET_MessageHeader *msg)
430 struct GNUNET_CHAT_Room *chat_room = cls;
433 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got a message from the service\n");
435 if (0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & GNUNET_SCHEDULER_get_reason ()))
440 rejoin_room (chat_room);
443 process_result (chat_room, msg);
444 if (NULL == chat_room->client)
445 return; /* fatal error */
446 /* continue receiving */
447 GNUNET_CLIENT_receive (chat_room->client, &receive_results, chat_room,
448 GNUNET_TIME_UNIT_FOREVER_REL);
453 * Read existing private key from file or create a new one if it does not exist
455 * Returns the private key on success, NULL on error.
457 static struct GNUNET_CRYPTO_RsaPrivateKey *
458 init_private_key (const struct GNUNET_CONFIGURATION_Handle *cfg,
459 const char *nick_name)
463 struct GNUNET_CRYPTO_RsaPrivateKey *privKey;
466 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Initializing private key\n");
469 GNUNET_CONFIGURATION_get_value_filename (cfg, "chat", "HOME", &home))
471 GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
475 GNUNET_DISK_directory_create (home);
476 if (GNUNET_YES != GNUNET_DISK_directory_test (home, GNUNET_YES))
478 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
479 _("Failed to access chat home directory `%s'\n"), home);
483 /* read or create private key */
485 GNUNET_malloc (strlen (home) + strlen (NICK_IDENTITY_PREFIX) +
486 strlen (nick_name) + 2);
487 strcpy (keyfile, home);
489 if (keyfile[strlen (keyfile) - 1] != DIR_SEPARATOR)
490 strcat (keyfile, DIR_SEPARATOR_STR);
491 strcat (keyfile, NICK_IDENTITY_PREFIX);
492 strcat (keyfile, nick_name);
493 privKey = GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
496 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
497 _("Failed to create/open key in file `%s'\n"), keyfile);
499 GNUNET_free (keyfile);
505 * Transmit a join request to the chat service.
507 * @param cls closure, pointer to the 'struct GNUNET_CHAT_Room'
508 * @param size number of bytes available in buf
509 * @param buf where the callee should write the message
510 * @return number of bytes written to buf
513 transmit_join_request (void *cls, size_t size, void *buf)
515 struct GNUNET_CHAT_Room *chat_room = cls;
516 struct JoinRequestMessage *join_msg;
526 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
527 "Could not transmit join request, retrying...\n");
529 rejoin_room (chat_room);
533 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
534 "Transmitting join request to the service\n");
536 room_len = strlen (chat_room->room_name);
538 GNUNET_CONTAINER_meta_data_get_serialized_size (chat_room->member_info);
539 size_of_join = sizeof (struct JoinRequestMessage) + meta_len + room_len;
540 GNUNET_assert (size >= size_of_join);
542 join_msg->header.size = htons (size);
543 join_msg->header.type = htons (GNUNET_MESSAGE_TYPE_CHAT_JOIN_REQUEST);
544 join_msg->msg_options = htonl (chat_room->msg_options);
545 join_msg->room_name_len = htons (room_len);
546 join_msg->reserved = htons (0);
547 join_msg->reserved2 = htonl (0);
548 GNUNET_CRYPTO_rsa_key_get_public (chat_room->my_private_key,
549 &join_msg->public_key);
550 room = (char *) &join_msg[1];
551 memcpy (room, chat_room->room_name, room_len);
552 meta = &room[room_len];
554 GNUNET_CONTAINER_meta_data_serialize (chat_room->member_info, &meta,
556 GNUNET_CONTAINER_META_DATA_SERIALIZE_FULL))
558 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, _("Could not serialize metadata\n"));
561 GNUNET_CLIENT_receive (chat_room->client, &receive_results, chat_room,
562 GNUNET_TIME_UNIT_FOREVER_REL);
568 * Ask to send a join request.
571 rejoin_room (struct GNUNET_CHAT_Room *chat_room)
576 sizeof (struct JoinRequestMessage) +
577 GNUNET_CONTAINER_meta_data_get_serialized_size (chat_room->member_info) +
578 strlen (chat_room->room_name);
580 GNUNET_CLIENT_notify_transmit_ready (chat_room->client, size_of_join,
581 GNUNET_CONSTANTS_SERVICE_TIMEOUT,
582 GNUNET_YES, &transmit_join_request,
584 return GNUNET_SYSERR;
593 GNUNET_CHAT_leave_room (struct GNUNET_CHAT_Room *chat_room)
595 struct MemberList *pos;
598 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Leaving the room '%s'\n",
599 chat_room->room_name);
601 GNUNET_CLIENT_disconnect (chat_room->client);
602 GNUNET_free (chat_room->room_name);
603 GNUNET_CONTAINER_meta_data_destroy (chat_room->member_info);
604 GNUNET_CRYPTO_rsa_key_free (chat_room->my_private_key);
605 while (NULL != chat_room->members)
607 pos = chat_room->members;
608 chat_room->members = pos->next;
609 GNUNET_CONTAINER_meta_data_destroy (pos->meta);
612 GNUNET_free (chat_room);
619 * @param cfg configuration
620 * @param nick_name nickname of the user joining (used to
621 * determine which public key to use);
622 * the nickname should probably also
623 * be used in the member_info (as "EXTRACTOR_TITLE")
624 * @param member_info information about the joining member
625 * @param room_name name of the room
626 * @param msg_options message options of the joining user
627 * @param joinCallback function to call on successful join
628 * @param join_cls closure for joinCallback
629 * @param messageCallback which function to call if a message has
631 * @param message_cls argument to callback
632 * @param memberCallback which function to call for join/leave notifications
633 * @param member_cls argument to callback
634 * @param confirmationCallback which function to call for confirmations (maybe NULL)
635 * @param confirmation_cls argument to callback
636 * @param me member ID (pseudonym)
637 * @return NULL on error
639 struct GNUNET_CHAT_Room *
640 GNUNET_CHAT_join_room (const struct GNUNET_CONFIGURATION_Handle *cfg,
641 const char *nick_name,
642 struct GNUNET_CONTAINER_MetaData *member_info,
643 const char *room_name,
644 enum GNUNET_CHAT_MsgOptions msg_options,
645 GNUNET_CHAT_JoinCallback joinCallback, void *join_cls,
646 GNUNET_CHAT_MessageCallback messageCallback,
648 GNUNET_CHAT_MemberListCallback memberCallback,
650 GNUNET_CHAT_MessageConfirmation confirmationCallback,
651 void *confirmation_cls, struct GNUNET_HashCode * me)
653 struct GNUNET_CHAT_Room *chat_room;
654 struct GNUNET_CRYPTO_RsaPrivateKey *priv_key;
655 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded pub_key;
656 struct GNUNET_CLIENT_Connection *client;
659 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Joining the room '%s'\n", room_name);
661 priv_key = init_private_key (cfg, nick_name);
662 if (NULL == priv_key)
664 GNUNET_CRYPTO_rsa_key_get_public (priv_key, &pub_key);
665 GNUNET_CRYPTO_hash (&pub_key,
666 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
668 GNUNET_PSEUDONYM_add (cfg, me, member_info);
669 client = GNUNET_CLIENT_connect ("chat", cfg);
672 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
673 _("Failed to connect to the chat service\n"));
676 if (NULL == joinCallback)
678 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
679 _("Undefined mandatory parameter: joinCallback\n"));
682 if (NULL == messageCallback)
684 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
685 _("Undefined mandatory parameter: messageCallback\n"));
688 if (NULL == memberCallback)
690 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
691 _("Undefined mandatory parameter: memberCallback\n"));
694 chat_room = GNUNET_malloc (sizeof (struct GNUNET_CHAT_Room));
695 chat_room->msg_options = msg_options;
696 chat_room->room_name = GNUNET_strdup (room_name);
697 chat_room->member_info = GNUNET_CONTAINER_meta_data_duplicate (member_info);
698 chat_room->my_private_key = priv_key;
699 chat_room->is_joined = GNUNET_NO;
700 chat_room->join_callback = joinCallback;
701 chat_room->join_callback_cls = join_cls;
702 chat_room->message_callback = messageCallback;
703 chat_room->message_callback_cls = message_cls;
704 chat_room->member_list_callback = memberCallback;
705 chat_room->member_list_callback_cls = member_cls;
706 chat_room->confirmation_callback = confirmationCallback;
707 chat_room->confirmation_cls = confirmation_cls;
708 chat_room->cfg = cfg;
709 chat_room->client = client;
710 chat_room->members = NULL;
711 if (GNUNET_SYSERR == rejoin_room (chat_room))
713 GNUNET_CHAT_leave_room (chat_room);
721 * Transmit a send-message request to the chat service.
723 * @param cls closure, pointer to the 'struct GNUNET_CHAT_SendMessageContext'
724 * @param size number of bytes available in buf
725 * @param buf where the callee should write the message
726 * @return number of bytes written to buf
729 transmit_send_request (void *cls, size_t size, void *buf)
731 struct GNUNET_CHAT_SendMessageContext *smc = cls;
732 struct TransmitRequestMessage *msg_to_send;
738 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Could not transmit a chat message\n");
743 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
744 "Transmitting a chat message to the service\n");
746 msg_size = strlen (smc->message) + sizeof (struct TransmitRequestMessage);
747 GNUNET_assert (size >= msg_size);
749 msg_to_send->header.size = htons (msg_size);
750 msg_to_send->header.type = htons (GNUNET_MESSAGE_TYPE_CHAT_TRANSMIT_REQUEST);
751 msg_to_send->msg_options = htonl (smc->options);
752 msg_to_send->sequence_number = htonl (smc->sequence_number);
753 msg_to_send->timestamp =
754 GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_get ());
755 msg_to_send->reserved = htonl (0);
756 if (NULL == smc->receiver)
757 memset (&msg_to_send->target, 0, sizeof (struct GNUNET_HashCode));
759 GNUNET_CRYPTO_hash (smc->receiver,
760 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
761 &msg_to_send->target);
762 memcpy (&msg_to_send[1], smc->message, strlen (smc->message));
764 * Client don't encode private messages since public keys of other members are
765 * stored on the service side.
767 if (smc->options & GNUNET_CHAT_MSG_AUTHENTICATED)
769 msg_to_send->purpose.purpose =
770 htonl (GNUNET_SIGNATURE_PURPOSE_CHAT_MESSAGE);
771 msg_to_send->purpose.size =
772 htonl (msg_size - sizeof (struct GNUNET_MessageHeader) -
773 sizeof (struct GNUNET_CRYPTO_RsaSignature));
774 GNUNET_assert (GNUNET_OK ==
775 GNUNET_CRYPTO_rsa_sign (smc->chat_room->my_private_key,
776 &msg_to_send->purpose,
777 &msg_to_send->signature));
779 GNUNET_free (smc->message);
788 * @param room handle for the chat room
789 * @param message message to be sent
790 * @param options options for the message
791 * @param receiver use NULL to send to everyone in the room
792 * @param sequence_number where to write the sequence id of the message
795 GNUNET_CHAT_send_message (struct GNUNET_CHAT_Room *room, const char *message,
796 enum GNUNET_CHAT_MsgOptions options,
797 const struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded
798 *receiver, uint32_t * sequence_number)
801 struct GNUNET_CHAT_SendMessageContext *smc;
804 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Sending a message\n");
806 room->sequence_number++;
807 if (NULL != sequence_number)
808 *sequence_number = room->sequence_number;
809 smc = GNUNET_malloc (sizeof (struct GNUNET_CHAT_SendMessageContext));
810 smc->chat_room = room;
811 smc->message = GNUNET_strdup (message);
812 smc->options = options;
813 smc->receiver = receiver;
814 smc->sequence_number = room->sequence_number;
815 msg_size = strlen (message) + sizeof (struct TransmitRequestMessage);
816 GNUNET_CLIENT_notify_transmit_ready (room->client, msg_size,
817 GNUNET_CONSTANTS_SERVICE_TIMEOUT,
818 GNUNET_YES, &transmit_send_request, smc);