2 This file is part of GNUnet.
3 (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., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, 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;
901 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
902 "%p Got join decision from client for group %s..\n",
903 grp, GNUNET_h2s (&grp->pub_key_hash));
905 struct GNUNET_CONTAINER_MultiHashMap *
906 grp_mem = GNUNET_CONTAINER_multihashmap_get (group_members,
908 struct Member *mem = NULL;
911 struct GNUNET_HashCode member_key_hash;
912 GNUNET_CRYPTO_hash (&hdcsn->member_key, sizeof (hdcsn->member_key),
914 mem = GNUNET_CONTAINER_multihashmap_get (grp_mem, &member_key_hash);
915 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
916 "%p ..and member %s: %p\n",
917 grp, GNUNET_h2s (&member_key_hash), mem);
920 { /* Found local member */
921 client_send_join_decision (mem, hdcsn);
924 { /* Look for remote member */
925 cadet_send_join_decision (grp, hdcsn);
927 GNUNET_SERVER_receive_done (client, GNUNET_OK);
932 * Incoming message from a client.
935 client_recv_multicast_message (void *cls, struct GNUNET_SERVER_Client *client,
936 const struct GNUNET_MessageHeader *m)
939 grp = GNUNET_SERVER_client_get_user_context (client, struct Group);
940 GNUNET_assert (GNUNET_YES == grp->is_origin);
941 struct Origin *orig = (struct Origin *) grp;
942 struct GNUNET_MULTICAST_MessageHeader *
943 msg = (struct GNUNET_MULTICAST_MessageHeader *) m;
945 msg->fragment_id = GNUNET_htonll (++orig->max_fragment_id);
946 msg->purpose.size = htonl (ntohs (msg->header.size)
947 - sizeof (msg->header)
948 - sizeof (msg->hop_counter)
949 - sizeof (msg->signature));
950 msg->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_MULTICAST_MESSAGE);
952 if (GNUNET_OK != GNUNET_CRYPTO_eddsa_sign (&orig->priv_key, &msg->purpose,
958 client_send_all (&grp->pub_key_hash, m);
959 cadet_send_members (&grp->pub_key_hash, m);
961 GNUNET_SERVER_receive_done (client, GNUNET_OK);
966 * Incoming request from a client.
969 client_recv_multicast_request (void *cls, struct GNUNET_SERVER_Client *client,
970 const struct GNUNET_MessageHeader *m)
973 grp = GNUNET_SERVER_client_get_user_context (client, struct Group);
974 GNUNET_assert (GNUNET_NO == grp->is_origin);
975 struct Member *mem = (struct Member *) grp;
977 struct GNUNET_MULTICAST_RequestHeader *
978 req = (struct GNUNET_MULTICAST_RequestHeader *) m;
980 req->fragment_id = GNUNET_ntohll (++mem->max_fragment_id);
981 req->purpose.size = htonl (ntohs (req->header.size)
982 - sizeof (req->header)
983 - sizeof (req->member_key)
984 - sizeof (req->signature));
985 req->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_MULTICAST_REQUEST);
987 if (GNUNET_OK != GNUNET_CRYPTO_ecdsa_sign (&mem->priv_key, &req->purpose,
993 if (0 == client_send_origin (&grp->pub_key_hash, m))
994 { /* No local origins, send to remote origin */
995 if (NULL != mem->origin_channel)
997 cadet_send_msg (mem->origin_channel, m);
1001 /* FIXME: not yet connected to origin */
1002 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1006 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1011 * A new client connected.
1014 client_notify_connect (void *cls, struct GNUNET_SERVER_Client *client)
1016 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Client connected: %p\n", client);
1017 /* FIXME: send connect ACK */
1022 * Message handlers for the server.
1024 static const struct GNUNET_SERVER_MessageHandler server_handlers[] = {
1025 { &client_recv_origin_start, NULL,
1026 GNUNET_MESSAGE_TYPE_MULTICAST_ORIGIN_START, 0 },
1028 { &client_recv_member_join, NULL,
1029 GNUNET_MESSAGE_TYPE_MULTICAST_MEMBER_JOIN, 0 },
1031 { &client_recv_join_decision, NULL,
1032 GNUNET_MESSAGE_TYPE_MULTICAST_JOIN_DECISION, 0 },
1034 { &client_recv_multicast_message, NULL,
1035 GNUNET_MESSAGE_TYPE_MULTICAST_MESSAGE, 0 },
1037 { &client_recv_multicast_request, NULL,
1038 GNUNET_MESSAGE_TYPE_MULTICAST_REQUEST, 0 },
1045 * New incoming CADET channel.
1048 cadet_notify_channel_new (void *cls,
1049 struct GNUNET_CADET_Channel *channel,
1050 const struct GNUNET_PeerIdentity *initiator,
1052 enum GNUNET_CADET_ChannelOption options)
1059 * CADET channel is being destroyed.
1062 cadet_notify_channel_end (void *cls,
1063 const struct GNUNET_CADET_Channel *channel,
1069 struct Channel *chn = ctx;
1070 if (NULL != chn->grp)
1072 if (GNUNET_NO == chn->grp->is_origin)
1074 struct Member *mem = (struct Member *) chn->grp;
1075 if (chn == mem->origin_channel)
1076 mem->origin_channel = NULL;
1084 * Incoming join request message from CADET.
1087 cadet_recv_join_request (void *cls,
1088 struct GNUNET_CADET_Channel *channel,
1090 const struct GNUNET_MessageHeader *m)
1092 const struct MulticastJoinRequestMessage *
1093 req = (const struct MulticastJoinRequestMessage *) m;
1094 uint16_t size = ntohs (m->size);
1095 if (size < sizeof (*req))
1097 GNUNET_break_op (0);
1098 return GNUNET_SYSERR;
1102 GNUNET_break_op (0);
1103 return GNUNET_SYSERR;
1105 if (ntohl (req->purpose.size) != (size
1106 - sizeof (req->header)
1107 - sizeof (req->reserved)
1108 - sizeof (req->signature)))
1110 GNUNET_break_op (0);
1111 return GNUNET_SYSERR;
1114 GNUNET_CRYPTO_ecdsa_verify (GNUNET_SIGNATURE_PURPOSE_MULTICAST_REQUEST,
1115 &req->purpose, &req->signature,
1118 GNUNET_break_op (0);
1119 return GNUNET_SYSERR;
1122 struct GNUNET_HashCode group_key_hash;
1123 GNUNET_CRYPTO_hash (&req->group_key, sizeof (req->group_key), &group_key_hash);
1125 struct Channel *chn = GNUNET_malloc (sizeof *chn);
1126 chn->channel = channel;
1127 chn->group_key = req->group_key;
1128 chn->group_key_hash = group_key_hash;
1129 chn->member_key = req->member_key;
1130 chn->peer = req->peer;
1131 chn->join_status = JOIN_WAITING;
1132 GNUNET_CONTAINER_multihashmap_put (channels_in, &chn->group_key_hash, chn,
1133 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
1135 client_send_all (&group_key_hash, m);
1141 * Incoming join decision message from CADET.
1144 cadet_recv_join_decision (void *cls,
1145 struct GNUNET_CADET_Channel *channel,
1147 const struct GNUNET_MessageHeader *m)
1149 const struct MulticastJoinDecisionMessage *
1150 dcsn = (const struct MulticastJoinDecisionMessage *) m;
1151 uint16_t size = ntohs (m->size);
1152 if (size < sizeof (*dcsn))
1154 GNUNET_break_op (0);
1155 return GNUNET_SYSERR;
1157 struct Channel *chn = *ctx;
1160 GNUNET_break_op (0);
1161 return GNUNET_SYSERR;
1163 if (NULL == chn->grp || GNUNET_NO != chn->grp->is_origin)
1165 GNUNET_break_op (0);
1166 return GNUNET_SYSERR;
1168 switch (chn->join_status)
1171 return GNUNET_SYSERR;
1176 case JOIN_NOT_ASKED:
1181 struct MulticastJoinDecisionMessageHeader *
1182 hdcsn = GNUNET_malloc (sizeof (*hdcsn) + size);
1183 hdcsn->peer = chn->peer;
1184 memcpy (&hdcsn[1], dcsn, sizeof (*hdcsn) + size);
1186 struct Member *mem = (struct Member *) chn->grp;
1187 client_send_join_decision (mem, hdcsn);
1189 if (GNUNET_YES == ntohs (dcsn->is_admitted))
1191 chn->join_status = JOIN_ADMITTED;
1196 chn->join_status = JOIN_REFUSED;
1197 return GNUNET_SYSERR;
1202 * Incoming multicast message from CADET.
1205 cadet_recv_message (void *cls,
1206 struct GNUNET_CADET_Channel *channel,
1208 const struct GNUNET_MessageHeader *m)
1210 const struct GNUNET_MULTICAST_MessageHeader *
1211 msg = (const struct GNUNET_MULTICAST_MessageHeader *) m;
1212 uint16_t size = ntohs (m->size);
1213 if (size < sizeof (*msg))
1215 GNUNET_break_op (0);
1216 return GNUNET_SYSERR;
1218 struct Channel *chn = *ctx;
1221 GNUNET_break_op (0);
1222 return GNUNET_SYSERR;
1224 if (ntohl (msg->purpose.size) != (size
1225 - sizeof (msg->header)
1226 - sizeof (msg->hop_counter)
1227 - sizeof (msg->signature)))
1229 GNUNET_break_op (0);
1230 return GNUNET_SYSERR;
1233 GNUNET_CRYPTO_eddsa_verify (GNUNET_SIGNATURE_PURPOSE_MULTICAST_MESSAGE,
1234 &msg->purpose, &msg->signature,
1237 GNUNET_break_op (0);
1238 return GNUNET_SYSERR;
1241 client_send_all (&chn->group_key_hash, m);
1247 * Incoming multicast request message from CADET.
1250 cadet_recv_request (void *cls,
1251 struct GNUNET_CADET_Channel *channel,
1253 const struct GNUNET_MessageHeader *m)
1255 const struct GNUNET_MULTICAST_RequestHeader *
1256 req = (const struct GNUNET_MULTICAST_RequestHeader *) m;
1257 uint16_t size = ntohs (m->size);
1258 if (size < sizeof (*req))
1260 GNUNET_break_op (0);
1261 return GNUNET_SYSERR;
1263 struct Channel *chn = *ctx;
1266 GNUNET_break_op (0);
1267 return GNUNET_SYSERR;
1269 if (ntohl (req->purpose.size) != (size
1270 - sizeof (req->header)
1271 - sizeof (req->member_key)
1272 - sizeof (req->signature)))
1274 GNUNET_break_op (0);
1275 return GNUNET_SYSERR;
1278 GNUNET_CRYPTO_ecdsa_verify (GNUNET_SIGNATURE_PURPOSE_MULTICAST_REQUEST,
1279 &req->purpose, &req->signature,
1282 GNUNET_break_op (0);
1283 return GNUNET_SYSERR;
1286 client_send_origin (&chn->group_key_hash, m);
1292 * Message handlers for CADET.
1294 static const struct GNUNET_CADET_MessageHandler cadet_handlers[] = {
1295 { &cadet_recv_join_request, GNUNET_MESSAGE_TYPE_MULTICAST_JOIN_REQUEST, 0 },
1296 { &cadet_recv_message, GNUNET_MESSAGE_TYPE_MULTICAST_MESSAGE, 0 },
1297 { &cadet_recv_request, GNUNET_MESSAGE_TYPE_MULTICAST_REQUEST, 0 },
1303 * Listening ports for CADET.
1305 static const uint32_t cadet_ports[] = { GNUNET_APPLICATION_TYPE_MULTICAST, 0 };
1309 * Connected to core service.
1312 core_connected_cb (void *cls, const struct GNUNET_PeerIdentity *my_identity)
1314 this_peer = *my_identity;
1316 stats = GNUNET_STATISTICS_create ("multicast", cfg);
1317 origins = GNUNET_CONTAINER_multihashmap_create (1, GNUNET_YES);
1318 members = GNUNET_CONTAINER_multihashmap_create (1, GNUNET_YES);
1319 group_members = GNUNET_CONTAINER_multihashmap_create (1, GNUNET_NO);
1320 channels_in = GNUNET_CONTAINER_multihashmap_create (1, GNUNET_YES);
1321 channels_out = GNUNET_CONTAINER_multihashmap_create (1, GNUNET_YES);
1323 cadet = GNUNET_CADET_connect (cfg, NULL,
1324 &cadet_notify_channel_new,
1325 &cadet_notify_channel_end,
1326 cadet_handlers, cadet_ports);
1328 nc = GNUNET_SERVER_notification_context_create (server, 1);
1329 GNUNET_SERVER_add_handlers (server, server_handlers);
1330 GNUNET_SERVER_disconnect_notify (server, &client_notify_disconnect, NULL);
1332 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &shutdown_task,
1340 * @param cls closure
1341 * @param server the initialized server
1342 * @param cfg configuration to use
1345 run (void *cls, struct GNUNET_SERVER_Handle *srv,
1346 const struct GNUNET_CONFIGURATION_Handle *c)
1350 GNUNET_SERVER_connect_notify (server, &client_notify_connect, NULL);
1351 core = GNUNET_CORE_connect (cfg, NULL, &core_connected_cb, NULL, NULL,
1352 NULL, GNUNET_NO, NULL, GNUNET_NO, NULL);
1357 * The main function for the multicast service.
1359 * @param argc number of arguments from the command line
1360 * @param argv command line arguments
1361 * @return 0 ok, 1 on error
1364 main (int argc, char *const *argv)
1366 return (GNUNET_OK ==
1367 GNUNET_SERVICE_run (argc, argv, "multicast",
1368 GNUNET_SERVICE_OPTION_NONE, &run, NULL)) ? 0 : 1;
1371 /* end of gnunet-service-multicast.c */