2 This file is part of GNUnet.
3 Copyright (C) 2009 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., 51 Franklin Street, Fifth Floor,
18 Boston, MA 02110-1301, USA.
22 * @file multicast/gnunet-service-multicast.c
23 * @brief program that does multicast
24 * @author Christian Grothoff
27 #include "gnunet_util_lib.h"
28 #include "gnunet_signatures.h"
29 #include "gnunet_applications.h"
30 #include "gnunet_statistics_service.h"
31 #include "gnunet_core_service.h"
32 #include "gnunet_cadet_service.h"
33 #include "gnunet_multicast_service.h"
34 #include "multicast.h"
37 * Handle to our current configuration.
39 static const struct GNUNET_CONFIGURATION_Handle *cfg;
44 static struct GNUNET_SERVER_Handle *server;
48 * Only used during initialization.
50 static struct GNUNET_CORE_Handle *core;
55 static struct GNUNET_CADET_Handle *cadet;
58 * Identity of this peer.
60 static struct GNUNET_PeerIdentity this_peer;
63 * Handle to the statistics service.
65 static struct GNUNET_STATISTICS_Handle *stats;
68 * Notification context, simplifies client broadcasts.
70 static struct GNUNET_SERVER_NotificationContext *nc;
73 * All connected origin clients.
74 * Group's pub_key_hash -> struct Origin * (uniq)
76 static struct GNUNET_CONTAINER_MultiHashMap *origins;
79 * All connected member clients.
80 * Group's pub_key_hash -> struct Member * (multi)
82 static struct GNUNET_CONTAINER_MultiHashMap *members;
85 * Connected member clients per group.
86 * Group's pub_key_hash -> Member's pub_key_hash (uniq) -> struct Member * (uniq)
88 static struct GNUNET_CONTAINER_MultiHashMap *group_members;
91 * Incoming CADET channels.
92 * Group's pub_key_hash -> struct Channel * (multi)
94 static struct GNUNET_CONTAINER_MultiHashMap *channels_in;
97 * Outgoing CADET channels.
98 * Group's pub_key_hash -> struct Channel * (multi)
100 static struct GNUNET_CONTAINER_MultiHashMap *channels_out;
103 * Join status of a remote peer.
113 enum ChannelDirection
121 * Context for a CADET channel.
126 * Group the channel belongs to.
128 * Only set for outgoing channels.
135 struct GNUNET_CADET_Channel *channel;
138 * CADET transmission handle.
140 struct GNUNET_CADET_TransmitHandle *tmit_handle;
143 * Public key of the target group.
145 struct GNUNET_CRYPTO_EddsaPublicKey group_key;
148 * Hash of @a group_key.
150 struct GNUNET_HashCode group_key_hash;
153 * Public key of the joining member.
155 struct GNUNET_CRYPTO_EcdsaPublicKey member_key;
158 * Remote peer identity.
160 struct GNUNET_PeerIdentity peer;
163 * Is the remote peer admitted to the group?
164 * @see enum JoinStatus
170 * @see enum ChannelDirection
177 * List of connected clients.
181 struct ClientList *prev;
182 struct ClientList *next;
183 struct GNUNET_SERVER_Client *client;
187 * Common part of the client context for both an origin and member.
191 struct ClientList *clients_head;
192 struct ClientList *clients_tail;
195 * Public key of the group.
197 struct GNUNET_CRYPTO_EddsaPublicKey pub_key;
200 * Hash of @a pub_key.
202 struct GNUNET_HashCode pub_key_hash;
205 * Is this an origin (#GNUNET_YES), or member (#GNUNET_NO)?
210 * Is the client disconnected? #GNUNET_YES or #GNUNET_NO
212 uint8_t disconnected;
217 * Client context for a group's origin.
224 * Private key of the group.
226 struct GNUNET_CRYPTO_EddsaPrivateKey priv_key;
229 * Last message fragment ID sent to the group.
231 uint64_t max_fragment_id;
236 * Client context for a group member.
243 * Private key of the member.
245 struct GNUNET_CRYPTO_EcdsaPrivateKey priv_key;
248 * Public key of the member.
250 struct GNUNET_CRYPTO_EcdsaPublicKey pub_key;
253 * Hash of @a pub_key.
255 struct GNUNET_HashCode pub_key_hash;
258 * Join request sent to the origin / members.
260 struct MulticastJoinRequestMessage *join_req;
263 * Join decision sent in reply to our request.
265 * Only a positive decision is stored here, in case of a negative decision the
266 * client is disconnected.
268 struct MulticastJoinDecisionMessageHeader *join_dcsn;
271 * CADET channel to the origin.
273 struct Channel *origin_channel;
276 * Peer identity of origin.
278 struct GNUNET_PeerIdentity origin;
281 * Peer identity of relays (other members to connect).
283 struct GNUNET_PeerIdentity *relays;
286 * Last request fragment ID sent to the origin.
288 uint64_t max_fragment_id;
291 * Number of @a relays.
293 uint32_t relay_count;
298 * Task run during shutdown.
304 shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
308 GNUNET_CORE_disconnect (core);
313 GNUNET_CADET_disconnect (cadet);
318 GNUNET_STATISTICS_destroy (stats, GNUNET_YES);
321 /* FIXME: do more clean up here */
326 * Clean up origin data structures after a client disconnected.
329 cleanup_origin (struct Origin *orig)
331 struct Group *grp = &orig->grp;
332 GNUNET_CONTAINER_multihashmap_remove (origins, &grp->pub_key_hash, orig);
337 * Clean up member data structures after a client disconnected.
340 cleanup_member (struct Member *mem)
342 struct Group *grp = &mem->grp;
343 struct GNUNET_CONTAINER_MultiHashMap *
344 grp_mem = GNUNET_CONTAINER_multihashmap_get (group_members,
346 GNUNET_assert (NULL != grp_mem);
347 GNUNET_CONTAINER_multihashmap_remove (grp_mem, &mem->pub_key_hash, mem);
349 if (0 == GNUNET_CONTAINER_multihashmap_size (grp_mem))
351 GNUNET_CONTAINER_multihashmap_remove (group_members, &grp->pub_key_hash,
353 GNUNET_CONTAINER_multihashmap_destroy (grp_mem);
355 if (NULL != mem->join_dcsn)
357 GNUNET_free (mem->join_dcsn);
358 mem->join_dcsn = NULL;
360 GNUNET_CONTAINER_multihashmap_remove (members, &grp->pub_key_hash, mem);
365 * Clean up group data structures after a client disconnected.
368 cleanup_group (struct Group *grp)
370 (GNUNET_YES == grp->is_origin)
371 ? cleanup_origin ((struct Origin *) grp)
372 : cleanup_member ((struct Member *) grp);
379 * Called whenever a client is disconnected.
381 * Frees our resources associated with that client.
383 * @param cls Closure.
384 * @param client Client handle.
387 client_notify_disconnect (void *cls, struct GNUNET_SERVER_Client *client)
393 = GNUNET_SERVER_client_get_user_context (client, struct Group);
397 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
398 "%p User context is NULL in client_disconnect()\n", grp);
403 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
404 "%p Client (%s) disconnected from group %s\n",
405 grp, (GNUNET_YES == grp->is_origin) ? "origin" : "member",
406 GNUNET_h2s (&grp->pub_key_hash));
408 struct ClientList *cl = grp->clients_head;
411 if (cl->client == client)
413 GNUNET_CONTAINER_DLL_remove (grp->clients_head, grp->clients_tail, cl);
420 if (NULL == grp->clients_head)
421 { /* Last client disconnected. */
423 if (NULL != grp->tmit_head)
424 { /* Send pending messages via CADET before cleanup. */
425 transmit_message (grp);
437 * Send message to all clients connected to the group.
440 client_send_msg (const struct Group *grp,
441 const struct GNUNET_MessageHeader *msg)
443 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
444 "%p Sending message to clients.\n", grp);
446 struct ClientList *cl = grp->clients_head;
449 GNUNET_SERVER_notification_context_add (nc, cl->client);
450 GNUNET_SERVER_notification_context_unicast (nc, cl->client, msg, GNUNET_NO);
457 * Iterator callback for sending a message to origin clients.
460 client_send_origin_cb (void *cls, const struct GNUNET_HashCode *pub_key_hash,
463 const struct GNUNET_MessageHeader *msg = cls;
464 struct Member *orig = origin;
466 client_send_msg (&orig->grp, msg);
472 * Iterator callback for sending a message to member clients.
475 client_send_member_cb (void *cls, const struct GNUNET_HashCode *pub_key_hash,
478 const struct GNUNET_MessageHeader *msg = cls;
479 struct Member *mem = member;
481 if (NULL != mem->join_dcsn)
482 { /* Only send message to admitted members */
483 client_send_msg (&mem->grp, msg);
490 * Send message to all origin and member clients connected to the group.
492 * @param grp The group to send @a msg to.
493 * @param msg Message to send.
496 client_send_all (struct GNUNET_HashCode *pub_key_hash,
497 const struct GNUNET_MessageHeader *msg)
501 n += GNUNET_CONTAINER_multihashmap_get_multiple (origins, pub_key_hash,
502 client_send_origin_cb,
505 n += GNUNET_CONTAINER_multihashmap_get_multiple (members, pub_key_hash,
506 client_send_member_cb,
513 * Send message to all origin clients connected to the group.
515 * @param grp The group to send @a msg to.
516 * @param msg Message to send.
519 client_send_origin (struct GNUNET_HashCode *pub_key_hash,
520 const struct GNUNET_MessageHeader *msg)
524 n += GNUNET_CONTAINER_multihashmap_get_multiple (origins, pub_key_hash,
525 client_send_origin_cb,
532 * CADET is ready to transmit a message.
535 cadet_notify_transmit_ready (void *cls, size_t buf_size, void *buf)
539 /* FIXME: connection closed */
542 const struct GNUNET_MessageHeader *msg = cls;
543 uint16_t msg_size = ntohs (msg->size);
544 GNUNET_assert (msg_size <= buf_size);
545 memcpy (buf, msg, msg_size);
551 * Send a message to a CADET channel.
553 * @param chn Channel.
554 * @param msg Message.
557 cadet_send_msg (struct Channel *chn, const struct GNUNET_MessageHeader *msg)
560 = GNUNET_CADET_notify_transmit_ready (chn->channel, GNUNET_NO,
561 GNUNET_TIME_UNIT_FOREVER_REL,
563 &cadet_notify_transmit_ready,
565 GNUNET_assert (NULL != chn->tmit_handle);
570 * Create new outgoing CADET channel.
573 * Peer to connect to.
575 * Public key of group the channel belongs to.
576 * @param group_key_hash
577 * Hash of @a group_key.
581 static struct Channel *
582 cadet_channel_create (struct Group *grp, struct GNUNET_PeerIdentity *peer)
584 struct Channel *chn = GNUNET_malloc (sizeof (*chn));
586 chn->group_key = grp->pub_key;
587 chn->group_key_hash = grp->pub_key_hash;
589 chn->direction = DIR_OUTGOING;
590 chn->join_status = JOIN_WAITING;
591 chn->channel = GNUNET_CADET_channel_create (cadet, chn, &chn->peer,
592 GNUNET_APPLICATION_TYPE_MULTICAST,
593 GNUNET_CADET_OPTION_RELIABLE);
594 GNUNET_CONTAINER_multihashmap_put (channels_out, &chn->group_key_hash, chn,
595 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
601 * Create CADET channel and send a join request.
604 cadet_send_join_request (struct Member *mem)
606 mem->origin_channel = cadet_channel_create (&mem->grp, &mem->origin);
607 cadet_send_msg (mem->origin_channel, &mem->join_req->header);
610 for (i = 0; i < mem->relay_count; i++)
613 chn = cadet_channel_create (&mem->grp, &mem->relays[i]);
614 cadet_send_msg (chn, &mem->join_req->header);
620 cadet_send_join_decision_cb (void *cls,
621 const struct GNUNET_HashCode *group_key_hash,
624 const struct MulticastJoinDecisionMessageHeader *hdcsn = cls;
625 struct Channel *chn = channel;
627 if (0 == memcmp (&hdcsn->member_key, &chn->member_key, sizeof (chn->member_key))
628 && 0 == memcmp (&hdcsn->peer, &chn->peer, sizeof (chn->peer)))
630 cadet_send_msg (chn, &hdcsn->header);
638 * Send join decision to a remote peer.
641 cadet_send_join_decision (struct Group *grp,
642 const struct MulticastJoinDecisionMessageHeader *hdcsn)
644 GNUNET_CONTAINER_multihashmap_get_multiple (channels_in, &grp->pub_key_hash,
645 &cadet_send_join_decision_cb,
651 * Iterator callback for sending a message to origin clients.
654 cadet_send_members_cb (void *cls, const struct GNUNET_HashCode *pub_key_hash,
657 const struct GNUNET_MessageHeader *msg = cls;
658 struct Channel *chn = channel;
659 if (JOIN_ADMITTED == chn->join_status)
660 cadet_send_msg (chn, msg);
666 cadet_send_members (struct GNUNET_HashCode *pub_key_hash,
667 const struct GNUNET_MessageHeader *msg)
670 if (channels_in != NULL)
671 n += GNUNET_CONTAINER_multihashmap_get_multiple (channels_in, pub_key_hash,
672 cadet_send_members_cb,
678 * Handle a connecting client starting an origin.
681 client_recv_origin_start (void *cls, struct GNUNET_SERVER_Client *client,
682 const struct GNUNET_MessageHeader *m)
684 const struct MulticastOriginStartMessage *
685 msg = (const struct MulticastOriginStartMessage *) m;
687 struct GNUNET_CRYPTO_EddsaPublicKey pub_key;
688 struct GNUNET_HashCode pub_key_hash;
690 GNUNET_CRYPTO_eddsa_key_get_public (&msg->group_key, &pub_key);
691 GNUNET_CRYPTO_hash (&pub_key, sizeof (pub_key), &pub_key_hash);
694 orig = GNUNET_CONTAINER_multihashmap_get (origins, &pub_key_hash);
699 orig = GNUNET_new (struct Origin);
700 orig->priv_key = msg->group_key;
701 orig->max_fragment_id = GNUNET_ntohll (msg->max_fragment_id);
703 grp->is_origin = GNUNET_YES;
704 grp->pub_key = pub_key;
705 grp->pub_key_hash = pub_key_hash;
707 GNUNET_CONTAINER_multihashmap_put (origins, &grp->pub_key_hash, orig,
708 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST);
715 struct ClientList *cl = GNUNET_new (struct ClientList);
717 GNUNET_CONTAINER_DLL_insert (grp->clients_head, grp->clients_tail, cl);
719 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
720 "%p Client connected as origin to group %s.\n",
721 orig, GNUNET_h2s (&grp->pub_key_hash));
723 GNUNET_SERVER_client_set_user_context (client, grp);
724 GNUNET_SERVER_receive_done (client, GNUNET_OK);
729 * Handle a connecting client joining a group.
732 client_recv_member_join (void *cls, struct GNUNET_SERVER_Client *client,
733 const struct GNUNET_MessageHeader *m)
735 const struct MulticastMemberJoinMessage *
736 msg = (const struct MulticastMemberJoinMessage *) m;
737 uint16_t msg_size = ntohs (msg->header.size);
739 struct GNUNET_CRYPTO_EcdsaPublicKey mem_pub_key;
740 struct GNUNET_HashCode pub_key_hash, mem_pub_key_hash;
742 GNUNET_CRYPTO_ecdsa_key_get_public (&msg->member_key, &mem_pub_key);
743 GNUNET_CRYPTO_hash (&mem_pub_key, sizeof (mem_pub_key), &mem_pub_key_hash);
744 GNUNET_CRYPTO_hash (&msg->group_key, sizeof (msg->group_key), &pub_key_hash);
746 struct GNUNET_CONTAINER_MultiHashMap *
747 grp_mem = GNUNET_CONTAINER_multihashmap_get (group_members, &pub_key_hash);
748 struct Member *mem = NULL;
753 mem = GNUNET_CONTAINER_multihashmap_get (grp_mem, &mem_pub_key_hash);
757 mem = GNUNET_new (struct Member);
758 mem->priv_key = msg->member_key;
759 mem->pub_key = mem_pub_key;
760 mem->pub_key_hash = mem_pub_key_hash;
761 mem->max_fragment_id = 0; // FIXME
764 grp->is_origin = GNUNET_NO;
765 grp->pub_key = msg->group_key;
766 grp->pub_key_hash = pub_key_hash;
770 grp_mem = GNUNET_CONTAINER_multihashmap_create (1, GNUNET_YES);
771 GNUNET_CONTAINER_multihashmap_put (group_members, &grp->pub_key_hash, grp_mem,
772 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST);
774 GNUNET_CONTAINER_multihashmap_put (grp_mem, &mem->pub_key_hash, mem,
775 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST);
776 GNUNET_CONTAINER_multihashmap_put (members, &grp->pub_key_hash, mem,
777 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
784 struct ClientList *cl = GNUNET_new (struct ClientList);
786 GNUNET_CONTAINER_DLL_insert (grp->clients_head, grp->clients_tail, cl);
788 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
789 "%p Client connected to group %s..\n",
790 mem, GNUNET_h2s (&grp->pub_key_hash));
791 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
792 "%p ..as member %s.\n",
793 mem, GNUNET_h2s (&mem_pub_key_hash));
795 GNUNET_SERVER_client_set_user_context (client, grp);
797 if (NULL != mem->join_dcsn)
798 { /* Already got a join decision, send it to client. */
799 GNUNET_SERVER_notification_context_add (nc, client);
800 GNUNET_SERVER_notification_context_unicast (nc, client,
801 (struct GNUNET_MessageHeader *)
805 else if (grp->clients_head == grp->clients_tail)
806 { /* First client of the group, send join request. */
807 struct GNUNET_PeerIdentity *relays = (struct GNUNET_PeerIdentity *) &msg[1];
808 uint32_t relay_count = ntohs (msg->relay_count);
809 uint16_t relay_size = relay_count * sizeof (*relays);
810 struct GNUNET_MessageHeader *join_msg = NULL;
811 uint16_t join_msg_size = 0;
812 if (sizeof (*msg) + relay_size + sizeof (struct GNUNET_MessageHeader)
815 join_msg = (struct GNUNET_MessageHeader *)
816 (((char *) &msg[1]) + relay_size);
817 join_msg_size = ntohs (join_msg->size);
819 if (sizeof (*msg) + relay_size + join_msg_size != msg_size)
822 GNUNET_SERVER_client_disconnect (client);
826 struct MulticastJoinRequestMessage *
827 req = GNUNET_malloc (sizeof (*req) + join_msg_size);
828 req->header.size = htons (sizeof (*req) + join_msg_size);
829 req->header.type = htons (GNUNET_MESSAGE_TYPE_MULTICAST_JOIN_REQUEST);
830 req->group_key = grp->pub_key;
831 req->peer = this_peer;
832 GNUNET_CRYPTO_ecdsa_key_get_public (&mem->priv_key, &req->member_key);
833 if (0 < join_msg_size)
834 memcpy (&req[1], join_msg, join_msg_size);
836 req->purpose.size = htonl (msg_size
837 - sizeof (req->header)
838 - sizeof (req->reserved)
839 - sizeof (req->signature));
840 req->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_MULTICAST_REQUEST);
842 if (GNUNET_OK != GNUNET_CRYPTO_ecdsa_sign (&mem->priv_key, &req->purpose,
845 /* FIXME: handle error */
849 if (NULL != mem->join_req)
850 GNUNET_free (mem->join_req);
853 if (0 == client_send_origin (&grp->pub_key_hash, &mem->join_req->header))
854 { /* No local origins, send to remote origin */
855 cadet_send_join_request (mem);
858 GNUNET_SERVER_receive_done (client, GNUNET_OK);
863 client_send_join_decision (struct Member *mem,
864 const struct MulticastJoinDecisionMessageHeader *hdcsn)
866 client_send_msg (&mem->grp, &hdcsn->header);
868 const struct MulticastJoinDecisionMessage *
869 dcsn = (const struct MulticastJoinDecisionMessage *) &hdcsn[1];
870 if (GNUNET_YES == ntohl (dcsn->is_admitted))
871 { /* Member admitted, store join_decision. */
872 uint16_t dcsn_size = ntohs (dcsn->header.size);
873 mem->join_dcsn = GNUNET_malloc (dcsn_size);
874 memcpy (mem->join_dcsn, dcsn, dcsn_size);
877 { /* Refused entry, disconnect clients. */
878 struct ClientList *cl = mem->grp.clients_head;
881 struct GNUNET_SERVER_Client *client = cl->client;
883 GNUNET_SERVER_client_disconnect (client);
890 * Join decision from client.
893 client_recv_join_decision (void *cls, struct GNUNET_SERVER_Client *client,
894 const struct GNUNET_MessageHeader *m)
897 grp = GNUNET_SERVER_client_get_user_context (client, struct Group);
898 const struct MulticastJoinDecisionMessageHeader *
899 hdcsn = (const struct MulticastJoinDecisionMessageHeader *) m;
904 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
907 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
908 "%p Got join decision from client for group %s..\n",
909 grp, GNUNET_h2s (&grp->pub_key_hash));
911 struct GNUNET_CONTAINER_MultiHashMap *
912 grp_mem = GNUNET_CONTAINER_multihashmap_get (group_members,
914 struct Member *mem = NULL;
917 struct GNUNET_HashCode member_key_hash;
918 GNUNET_CRYPTO_hash (&hdcsn->member_key, sizeof (hdcsn->member_key),
920 mem = GNUNET_CONTAINER_multihashmap_get (grp_mem, &member_key_hash);
921 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
922 "%p ..and member %s: %p\n",
923 grp, GNUNET_h2s (&member_key_hash), mem);
926 { /* Found local member */
927 client_send_join_decision (mem, hdcsn);
930 { /* Look for remote member */
931 cadet_send_join_decision (grp, hdcsn);
933 GNUNET_SERVER_receive_done (client, GNUNET_OK);
938 * Incoming message from a client.
941 client_recv_multicast_message (void *cls, struct GNUNET_SERVER_Client *client,
942 const struct GNUNET_MessageHeader *m)
945 grp = GNUNET_SERVER_client_get_user_context (client, struct Group);
946 struct GNUNET_MULTICAST_MessageHeader *out;
952 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
955 GNUNET_assert (GNUNET_YES == grp->is_origin);
956 orig = (struct Origin *) grp;
957 /* FIXME: yucky, should use separate message structs for P2P and CS! */
958 out = (struct GNUNET_MULTICAST_MessageHeader *) GNUNET_copy_message (m);
960 out->fragment_id = GNUNET_htonll (++orig->max_fragment_id);
961 out->purpose.size = htonl (ntohs (out->header.size)
962 - sizeof (out->header)
963 - sizeof (out->hop_counter)
964 - sizeof (out->signature));
965 out->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_MULTICAST_MESSAGE);
967 if (GNUNET_OK != GNUNET_CRYPTO_eddsa_sign (&orig->priv_key, &out->purpose,
973 client_send_all (&grp->pub_key_hash, &out->header);
974 cadet_send_members (&grp->pub_key_hash, &out->header);
977 GNUNET_SERVER_receive_done (client, GNUNET_OK);
982 * Incoming request from a client.
985 client_recv_multicast_request (void *cls, struct GNUNET_SERVER_Client *client,
986 const struct GNUNET_MessageHeader *m)
988 struct Group *grp = GNUNET_SERVER_client_get_user_context (client, struct Group);
990 struct GNUNET_MULTICAST_RequestHeader *out;
995 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
998 GNUNET_assert (GNUNET_NO == grp->is_origin);
999 mem = (struct Member *) grp;
1000 /* FIXME: yucky, should use separate message structs for P2P and CS! */
1001 out = (struct GNUNET_MULTICAST_RequestHeader *) GNUNET_copy_message (m);
1003 out->fragment_id = GNUNET_ntohll (++mem->max_fragment_id);
1004 out->purpose.size = htonl (ntohs (out->header.size)
1005 - sizeof (out->header)
1006 - sizeof (out->member_key)
1007 - sizeof (out->signature));
1008 out->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_MULTICAST_REQUEST);
1010 if (GNUNET_OK != GNUNET_CRYPTO_ecdsa_sign (&mem->priv_key, &out->purpose,
1016 if (0 == client_send_origin (&grp->pub_key_hash, &out->header))
1017 { /* No local origins, send to remote origin */
1018 if (NULL != mem->origin_channel)
1020 cadet_send_msg (mem->origin_channel, &out->header);
1024 /* FIXME: not yet connected to origin */
1025 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1031 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1036 * A new client connected.
1039 client_notify_connect (void *cls, struct GNUNET_SERVER_Client *client)
1041 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Client connected: %p\n", client);
1042 /* FIXME: send connect ACK */
1047 * Message handlers for the server.
1049 static const struct GNUNET_SERVER_MessageHandler server_handlers[] = {
1050 { &client_recv_origin_start, NULL,
1051 GNUNET_MESSAGE_TYPE_MULTICAST_ORIGIN_START, 0 },
1053 { &client_recv_member_join, NULL,
1054 GNUNET_MESSAGE_TYPE_MULTICAST_MEMBER_JOIN, 0 },
1056 { &client_recv_join_decision, NULL,
1057 GNUNET_MESSAGE_TYPE_MULTICAST_JOIN_DECISION, 0 },
1059 { &client_recv_multicast_message, NULL,
1060 GNUNET_MESSAGE_TYPE_MULTICAST_MESSAGE, 0 },
1062 { &client_recv_multicast_request, NULL,
1063 GNUNET_MESSAGE_TYPE_MULTICAST_REQUEST, 0 },
1070 * New incoming CADET channel.
1073 cadet_notify_channel_new (void *cls,
1074 struct GNUNET_CADET_Channel *channel,
1075 const struct GNUNET_PeerIdentity *initiator,
1077 enum GNUNET_CADET_ChannelOption options)
1084 * CADET channel is being destroyed.
1087 cadet_notify_channel_end (void *cls,
1088 const struct GNUNET_CADET_Channel *channel,
1094 struct Channel *chn = ctx;
1095 if (NULL != chn->grp)
1097 if (GNUNET_NO == chn->grp->is_origin)
1099 struct Member *mem = (struct Member *) chn->grp;
1100 if (chn == mem->origin_channel)
1101 mem->origin_channel = NULL;
1109 * Incoming join request message from CADET.
1112 cadet_recv_join_request (void *cls,
1113 struct GNUNET_CADET_Channel *channel,
1115 const struct GNUNET_MessageHeader *m)
1117 const struct MulticastJoinRequestMessage *
1118 req = (const struct MulticastJoinRequestMessage *) m;
1119 uint16_t size = ntohs (m->size);
1120 if (size < sizeof (*req))
1122 GNUNET_break_op (0);
1123 return GNUNET_SYSERR;
1127 GNUNET_break_op (0);
1128 return GNUNET_SYSERR;
1130 if (ntohl (req->purpose.size) != (size
1131 - sizeof (req->header)
1132 - sizeof (req->reserved)
1133 - sizeof (req->signature)))
1135 GNUNET_break_op (0);
1136 return GNUNET_SYSERR;
1139 GNUNET_CRYPTO_ecdsa_verify (GNUNET_SIGNATURE_PURPOSE_MULTICAST_REQUEST,
1140 &req->purpose, &req->signature,
1143 GNUNET_break_op (0);
1144 return GNUNET_SYSERR;
1147 struct GNUNET_HashCode group_key_hash;
1148 GNUNET_CRYPTO_hash (&req->group_key, sizeof (req->group_key), &group_key_hash);
1150 struct Channel *chn = GNUNET_malloc (sizeof *chn);
1151 chn->channel = channel;
1152 chn->group_key = req->group_key;
1153 chn->group_key_hash = group_key_hash;
1154 chn->member_key = req->member_key;
1155 chn->peer = req->peer;
1156 chn->join_status = JOIN_WAITING;
1157 GNUNET_CONTAINER_multihashmap_put (channels_in, &chn->group_key_hash, chn,
1158 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
1160 client_send_all (&group_key_hash, m);
1166 * Incoming join decision message from CADET.
1169 cadet_recv_join_decision (void *cls,
1170 struct GNUNET_CADET_Channel *channel,
1172 const struct GNUNET_MessageHeader *m)
1174 const struct MulticastJoinDecisionMessage *
1175 dcsn = (const struct MulticastJoinDecisionMessage *) m;
1176 uint16_t size = ntohs (m->size);
1177 if (size < sizeof (*dcsn))
1179 GNUNET_break_op (0);
1180 return GNUNET_SYSERR;
1182 struct Channel *chn = *ctx;
1185 GNUNET_break_op (0);
1186 return GNUNET_SYSERR;
1188 if (NULL == chn->grp || GNUNET_NO != chn->grp->is_origin)
1190 GNUNET_break_op (0);
1191 return GNUNET_SYSERR;
1193 switch (chn->join_status)
1196 return GNUNET_SYSERR;
1201 case JOIN_NOT_ASKED:
1206 struct MulticastJoinDecisionMessageHeader *
1207 hdcsn = GNUNET_malloc (sizeof (*hdcsn) + size);
1208 hdcsn->peer = chn->peer;
1209 memcpy (&hdcsn[1], dcsn, sizeof (*hdcsn) + size);
1211 struct Member *mem = (struct Member *) chn->grp;
1212 client_send_join_decision (mem, hdcsn);
1213 GNUNET_free (hdcsn);
1214 if (GNUNET_YES == ntohs (dcsn->is_admitted))
1216 chn->join_status = JOIN_ADMITTED;
1221 chn->join_status = JOIN_REFUSED;
1222 return GNUNET_SYSERR;
1227 * Incoming multicast message from CADET.
1230 cadet_recv_message (void *cls,
1231 struct GNUNET_CADET_Channel *channel,
1233 const struct GNUNET_MessageHeader *m)
1235 const struct GNUNET_MULTICAST_MessageHeader *
1236 msg = (const struct GNUNET_MULTICAST_MessageHeader *) m;
1237 uint16_t size = ntohs (m->size);
1238 if (size < sizeof (*msg))
1240 GNUNET_break_op (0);
1241 return GNUNET_SYSERR;
1243 struct Channel *chn = *ctx;
1246 GNUNET_break_op (0);
1247 return GNUNET_SYSERR;
1249 if (ntohl (msg->purpose.size) != (size
1250 - sizeof (msg->header)
1251 - sizeof (msg->hop_counter)
1252 - sizeof (msg->signature)))
1254 GNUNET_break_op (0);
1255 return GNUNET_SYSERR;
1258 GNUNET_CRYPTO_eddsa_verify (GNUNET_SIGNATURE_PURPOSE_MULTICAST_MESSAGE,
1259 &msg->purpose, &msg->signature,
1262 GNUNET_break_op (0);
1263 return GNUNET_SYSERR;
1266 client_send_all (&chn->group_key_hash, m);
1272 * Incoming multicast request message from CADET.
1275 cadet_recv_request (void *cls,
1276 struct GNUNET_CADET_Channel *channel,
1278 const struct GNUNET_MessageHeader *m)
1280 const struct GNUNET_MULTICAST_RequestHeader *
1281 req = (const struct GNUNET_MULTICAST_RequestHeader *) m;
1282 uint16_t size = ntohs (m->size);
1283 if (size < sizeof (*req))
1285 GNUNET_break_op (0);
1286 return GNUNET_SYSERR;
1288 struct Channel *chn = *ctx;
1291 GNUNET_break_op (0);
1292 return GNUNET_SYSERR;
1294 if (ntohl (req->purpose.size) != (size
1295 - sizeof (req->header)
1296 - sizeof (req->member_key)
1297 - sizeof (req->signature)))
1299 GNUNET_break_op (0);
1300 return GNUNET_SYSERR;
1303 GNUNET_CRYPTO_ecdsa_verify (GNUNET_SIGNATURE_PURPOSE_MULTICAST_REQUEST,
1304 &req->purpose, &req->signature,
1307 GNUNET_break_op (0);
1308 return GNUNET_SYSERR;
1311 client_send_origin (&chn->group_key_hash, m);
1317 * Message handlers for CADET.
1319 static const struct GNUNET_CADET_MessageHandler cadet_handlers[] = {
1320 { &cadet_recv_join_request, GNUNET_MESSAGE_TYPE_MULTICAST_JOIN_REQUEST, 0 },
1321 { &cadet_recv_message, GNUNET_MESSAGE_TYPE_MULTICAST_MESSAGE, 0 },
1322 { &cadet_recv_request, GNUNET_MESSAGE_TYPE_MULTICAST_REQUEST, 0 },
1328 * Listening ports for CADET.
1330 static const uint32_t cadet_ports[] = { GNUNET_APPLICATION_TYPE_MULTICAST, 0 };
1334 * Connected to core service.
1337 core_connected_cb (void *cls, const struct GNUNET_PeerIdentity *my_identity)
1339 this_peer = *my_identity;
1341 stats = GNUNET_STATISTICS_create ("multicast", cfg);
1342 origins = GNUNET_CONTAINER_multihashmap_create (1, GNUNET_YES);
1343 members = GNUNET_CONTAINER_multihashmap_create (1, GNUNET_YES);
1344 group_members = GNUNET_CONTAINER_multihashmap_create (1, GNUNET_NO);
1345 channels_in = GNUNET_CONTAINER_multihashmap_create (1, GNUNET_YES);
1346 channels_out = GNUNET_CONTAINER_multihashmap_create (1, GNUNET_YES);
1348 cadet = GNUNET_CADET_connect (cfg, NULL,
1349 &cadet_notify_channel_new,
1350 &cadet_notify_channel_end,
1351 cadet_handlers, cadet_ports);
1353 nc = GNUNET_SERVER_notification_context_create (server, 1);
1354 GNUNET_SERVER_add_handlers (server, server_handlers);
1355 GNUNET_SERVER_disconnect_notify (server, &client_notify_disconnect, NULL);
1357 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &shutdown_task,
1365 * @param cls closure
1366 * @param server the initialized server
1367 * @param cfg configuration to use
1370 run (void *cls, struct GNUNET_SERVER_Handle *srv,
1371 const struct GNUNET_CONFIGURATION_Handle *c)
1375 GNUNET_SERVER_connect_notify (server, &client_notify_connect, NULL);
1376 core = GNUNET_CORE_connect (cfg, NULL, &core_connected_cb, NULL, NULL,
1377 NULL, GNUNET_NO, NULL, GNUNET_NO, NULL);
1382 * The main function for the multicast service.
1384 * @param argc number of arguments from the command line
1385 * @param argv command line arguments
1386 * @return 0 ok, 1 on error
1389 main (int argc, char *const *argv)
1391 return (GNUNET_OK ==
1392 GNUNET_SERVICE_run (argc, argv, "multicast",
1393 GNUNET_SERVICE_OPTION_NONE, &run, NULL)) ? 0 : 1;
1396 /* end of gnunet-service-multicast.c */