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3 (C) 2012, 2013 Christian Grothoff (and other contributing authors)
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22 * @file multicast/multicast_api.c
23 * @brief Multicast service; implements multicast groups using CADET connections.
24 * @author Christian Grothoff
25 * @author Gabor X Toth
29 #include "gnunet_util_lib.h"
30 #include "gnunet_multicast_service.h"
31 #include "multicast.h"
33 #define LOG(kind,...) GNUNET_log_from (kind, "multicast-api",__VA_ARGS__)
37 * Handle for a request to send a message to all multicast group members
40 struct GNUNET_MULTICAST_OriginTransmitHandle
42 GNUNET_MULTICAST_OriginTransmitNotify notify;
44 struct GNUNET_MULTICAST_Origin *origin;
47 uint64_t group_generation;
48 uint64_t fragment_offset;
53 * Handle for a message to be delivered from a member to the origin.
55 struct GNUNET_MULTICAST_MemberTransmitHandle
57 GNUNET_MULTICAST_MemberTransmitNotify notify;
59 struct GNUNET_MULTICAST_Member *member;
62 uint64_t fragment_offset;
66 struct GNUNET_MULTICAST_Group
69 * Configuration to use.
71 const struct GNUNET_CONFIGURATION_Handle *cfg;
74 * Client connection to the service.
76 struct GNUNET_CLIENT_MANAGER_Connection *client;
79 * Message to send on reconnect.
81 struct GNUNET_MessageHeader *connect_msg;
83 GNUNET_MULTICAST_JoinRequestCallback join_req_cb;
84 GNUNET_MULTICAST_MembershipTestCallback member_test_cb;
85 GNUNET_MULTICAST_ReplayFragmentCallback replay_frag_cb;
86 GNUNET_MULTICAST_ReplayMessageCallback replay_msg_cb;
87 GNUNET_MULTICAST_MessageCallback message_cb;
91 * Function called after disconnected from the service.
93 GNUNET_ContinuationCallback disconnect_cb;
96 * Closure for @a disconnect_cb.
101 * Are we currently transmitting a message?
106 * Is this the origin or a member?
111 * Is this channel in the process of disconnecting from the service?
112 * #GNUNET_YES or #GNUNET_NO
114 uint8_t is_disconnecting;
119 * Handle for the origin of a multicast group.
121 struct GNUNET_MULTICAST_Origin
123 struct GNUNET_MULTICAST_Group grp;
124 struct GNUNET_MULTICAST_OriginTransmitHandle tmit;
126 GNUNET_MULTICAST_RequestCallback request_cb;
131 * Handle for a multicast group member.
133 struct GNUNET_MULTICAST_Member
135 struct GNUNET_MULTICAST_Group grp;
136 struct GNUNET_MULTICAST_MemberTransmitHandle tmit;
138 GNUNET_MULTICAST_JoinDecisionCallback join_dcsn_cb;
140 uint64_t next_fragment_id;
145 * Handle that identifies a join request.
147 * Used to match calls to #GNUNET_MULTICAST_JoinCallback to the
148 * corresponding calls to #GNUNET_MULTICAST_join_decision().
150 struct GNUNET_MULTICAST_JoinHandle
152 struct GNUNET_MULTICAST_Group *group;
155 * Public key of the member requesting join.
157 struct GNUNET_CRYPTO_EcdsaPublicKey member_key;
160 * Peer identity of the member requesting join.
162 struct GNUNET_PeerIdentity member_peer;
167 * Handle to pass back for the answer of a membership test.
169 struct GNUNET_MULTICAST_MembershipTestHandle
175 * Opaque handle to a replay request from the multicast service.
177 struct GNUNET_MULTICAST_ReplayHandle
183 * Handle for a replay request.
185 struct GNUNET_MULTICAST_MemberReplayHandle
191 * Send first message to the service after connecting.
194 group_send_connect_msg (struct GNUNET_MULTICAST_Group *grp)
196 uint16_t cmsg_size = ntohs (grp->connect_msg->size);
197 struct GNUNET_MessageHeader * cmsg = GNUNET_malloc (cmsg_size);
198 memcpy (cmsg, grp->connect_msg, cmsg_size);
199 GNUNET_CLIENT_MANAGER_transmit_now (grp->client, cmsg);
204 * Got disconnected from service. Reconnect.
207 group_recv_disconnect (void *cls,
208 struct GNUNET_CLIENT_MANAGER_Connection *client,
209 const struct GNUNET_MessageHeader *msg)
211 struct GNUNET_MULTICAST_Group *
212 grp = GNUNET_CLIENT_MANAGER_get_user_context_ (client, sizeof (*grp));
213 GNUNET_CLIENT_MANAGER_reconnect (client);
214 group_send_connect_msg (grp);
219 * Receive join request from service.
222 group_recv_join_request (void *cls,
223 struct GNUNET_CLIENT_MANAGER_Connection *client,
224 const struct GNUNET_MessageHeader *msg)
226 struct GNUNET_MULTICAST_Group *
227 grp = GNUNET_CLIENT_MANAGER_get_user_context_ (client, sizeof (*grp));
229 const struct MulticastJoinRequestMessage *
230 jreq = (const struct MulticastJoinRequestMessage *) msg;
232 struct GNUNET_MULTICAST_JoinHandle *jh = GNUNET_malloc (sizeof (*jh));
234 jh->member_key = jreq->member_key;
235 jh->member_peer = jreq->member_peer;
237 const struct GNUNET_MessageHeader *jmsg = NULL;
238 if (sizeof (*jreq) + sizeof (*jmsg) <= ntohs (jreq->header.size))
239 jmsg = (const struct GNUNET_MessageHeader *) &jreq[1];
241 if (NULL != grp->join_req_cb)
242 grp->join_req_cb (grp->cb_cls, &jreq->member_key, jmsg, jh);
247 * Receive multicast message from service.
250 group_recv_message (void *cls,
251 struct GNUNET_CLIENT_MANAGER_Connection *client,
252 const struct GNUNET_MessageHeader *msg)
254 struct GNUNET_MULTICAST_Group *
255 grp = GNUNET_CLIENT_MANAGER_get_user_context_ (client, sizeof (*grp));
256 struct GNUNET_MULTICAST_MessageHeader *
257 mmsg = (struct GNUNET_MULTICAST_MessageHeader *) msg;
259 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
260 "Calling message callback with a message of size %u.\n",
261 ntohs (mmsg->header.size));
263 if (NULL != grp->message_cb)
264 grp->message_cb (grp->cb_cls, mmsg);
269 * Origin receives uniquest request from a member.
272 origin_recv_request (void *cls,
273 struct GNUNET_CLIENT_MANAGER_Connection *client,
274 const struct GNUNET_MessageHeader *msg)
276 struct GNUNET_MULTICAST_Group *grp;
277 struct GNUNET_MULTICAST_Origin *
278 orig = GNUNET_CLIENT_MANAGER_get_user_context_ (client, sizeof (*grp));
280 struct GNUNET_MULTICAST_RequestHeader *
281 req = (struct GNUNET_MULTICAST_RequestHeader *) msg;
283 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
284 "Calling request callback with a request of size %u.\n",
285 ntohs (req->header.size));
287 if (NULL != orig->request_cb)
288 orig->request_cb (grp->cb_cls, req);
293 * Member receives join decision.
296 member_recv_join_decision (void *cls,
297 struct GNUNET_CLIENT_MANAGER_Connection *client,
298 const struct GNUNET_MessageHeader *msg)
300 struct GNUNET_MULTICAST_Group *grp;
301 struct GNUNET_MULTICAST_Member *
302 mem = GNUNET_CLIENT_MANAGER_get_user_context_ (client, sizeof (*grp));
305 const struct MulticastJoinDecisionMessageHeader *
306 hdcsn = (const struct MulticastJoinDecisionMessageHeader *) msg;
307 const struct MulticastJoinDecisionMessage *
308 dcsn = (const struct MulticastJoinDecisionMessage *) &hdcsn[1];
310 uint16_t dcsn_size = ntohs (dcsn->header.size);
311 int is_admitted = ntohl (dcsn->is_admitted);
313 const struct GNUNET_MessageHeader *join_resp = NULL;
314 uint16_t join_resp_size = 0;
316 uint16_t relay_count = ntohl (dcsn->relay_count);
317 const struct GNUNET_PeerIdentity *relays = NULL;
318 uint16_t relay_size = relay_count * sizeof (*relays);
319 if (0 < relay_count && dcsn_size < sizeof (*dcsn) + relay_size)
320 relays = (struct GNUNET_PeerIdentity *) &dcsn[1];
322 if (sizeof (*dcsn) + relay_size + sizeof (*join_resp) <= dcsn_size)
324 join_resp = (const struct GNUNET_MessageHeader *) &dcsn[1];
325 join_resp_size = ntohs (join_resp->size);
327 if (dcsn_size < sizeof (*dcsn) + relay_size + join_resp_size)
329 LOG (GNUNET_ERROR_TYPE_DEBUG,
330 "Received invalid join decision message from multicast.\n");
332 is_admitted = GNUNET_SYSERR;
335 if (NULL != mem->join_dcsn_cb)
336 mem->join_dcsn_cb (grp->cb_cls, is_admitted, &hdcsn->peer,
337 relay_count, relays, join_resp);
340 //if (GNUNET_YES != is_admitted)
341 // GNUNET_MULTICAST_member_part (mem);
346 * Message handlers for an origin.
348 static struct GNUNET_CLIENT_MANAGER_MessageHandler origin_handlers[] =
350 { &group_recv_disconnect, NULL, 0, 0, GNUNET_NO },
352 { &group_recv_message, NULL,
353 GNUNET_MESSAGE_TYPE_MULTICAST_MESSAGE,
354 sizeof (struct GNUNET_MULTICAST_MessageHeader), GNUNET_YES },
356 { &origin_recv_request, NULL,
357 GNUNET_MESSAGE_TYPE_MULTICAST_REQUEST,
358 sizeof (struct GNUNET_MULTICAST_RequestHeader), GNUNET_YES },
360 { &group_recv_join_request, NULL,
361 GNUNET_MESSAGE_TYPE_MULTICAST_JOIN_REQUEST,
362 sizeof (struct MulticastJoinRequestMessage), GNUNET_YES },
364 { NULL, NULL, 0, 0, GNUNET_NO }
369 * Message handlers for a member.
371 static struct GNUNET_CLIENT_MANAGER_MessageHandler member_handlers[] =
373 { &group_recv_disconnect, NULL, 0, 0, GNUNET_NO },
375 { &group_recv_message, NULL,
376 GNUNET_MESSAGE_TYPE_MULTICAST_MESSAGE,
377 sizeof (struct GNUNET_MULTICAST_MessageHeader), GNUNET_YES },
379 { &group_recv_join_request, NULL,
380 GNUNET_MESSAGE_TYPE_MULTICAST_JOIN_REQUEST,
381 sizeof (struct MulticastJoinRequestMessage), GNUNET_YES },
383 { &member_recv_join_decision, NULL,
384 GNUNET_MESSAGE_TYPE_MULTICAST_JOIN_DECISION,
385 sizeof (struct MulticastJoinDecisionMessage), GNUNET_YES },
387 { NULL, NULL, 0, 0, GNUNET_NO }
392 group_cleanup (struct GNUNET_MULTICAST_Group *grp)
394 GNUNET_free (grp->connect_msg);
395 if (NULL != grp->disconnect_cb)
396 grp->disconnect_cb (grp->disconnect_cls);
401 origin_cleanup (void *cls)
403 struct GNUNET_MULTICAST_Origin *orig = cls;
404 group_cleanup (&orig->grp);
410 member_cleanup (void *cls)
412 struct GNUNET_MULTICAST_Member *mem = cls;
413 group_cleanup (&mem->grp);
419 * Function to call with the decision made for a join request.
421 * Must be called once and only once in response to an invocation of the
422 * #GNUNET_MULTICAST_JoinRequestCallback.
424 * @param join Join request handle.
425 * @param is_admitted #GNUNET_YES if the join is approved,
426 * #GNUNET_NO if it is disapproved,
427 * #GNUNET_SYSERR if we cannot answer the request.
428 * @param relay_count Number of relays given.
429 * @param relays Array of suggested peers that might be useful relays to use
430 * when joining the multicast group (essentially a list of peers that
431 * are already part of the multicast group and might thus be willing
432 * to help with routing). If empty, only this local peer (which must
433 * be the multicast origin) is a good candidate for building the
434 * multicast tree. Note that it is unnecessary to specify our own
435 * peer identity in this array.
436 * @param join_resp Message to send in response to the joining peer;
437 * can also be used to redirect the peer to a different group at the
438 * application layer; this response is to be transmitted to the
439 * peer that issued the request even if admission is denied.
441 struct GNUNET_MULTICAST_ReplayHandle *
442 GNUNET_MULTICAST_join_decision (struct GNUNET_MULTICAST_JoinHandle *join,
444 uint16_t relay_count,
445 const struct GNUNET_PeerIdentity *relays,
446 const struct GNUNET_MessageHeader *join_resp)
448 struct GNUNET_MULTICAST_Group *grp = join->group;
449 uint16_t join_resp_size = (NULL != join_resp) ? ntohs (join_resp->size) : 0;
450 uint16_t relay_size = relay_count * sizeof (*relays);
452 struct MulticastJoinDecisionMessageHeader * hdcsn;
453 struct MulticastJoinDecisionMessage *dcsn;
454 hdcsn = GNUNET_malloc (sizeof (*hdcsn) + sizeof (*dcsn)
455 + relay_size + join_resp_size);
456 hdcsn->header.size = htons (sizeof (*hdcsn) + sizeof (*dcsn)
457 + relay_size + join_resp_size);
458 hdcsn->header.type = htons (GNUNET_MESSAGE_TYPE_MULTICAST_JOIN_DECISION);
459 hdcsn->member_key = join->member_key;
460 hdcsn->peer = join->member_peer;
462 dcsn = (struct MulticastJoinDecisionMessage *) &hdcsn[1];
463 dcsn->header.type = htons (GNUNET_MESSAGE_TYPE_MULTICAST_JOIN_DECISION);
464 dcsn->header.size = htons (sizeof (*dcsn) + relay_size + join_resp_size);
465 dcsn->is_admitted = htonl (is_admitted);
466 dcsn->relay_count = htonl (relay_count);
468 memcpy (&dcsn[1], relays, relay_size);
469 if (0 < join_resp_size)
470 memcpy (((char *) &dcsn[1]) + relay_size, join_resp, join_resp_size);
472 GNUNET_CLIENT_MANAGER_transmit (grp->client, &hdcsn->header);
479 * Call informing multicast about the decision taken for a membership test.
481 * @param mth Handle that was given for the query.
482 * @param result #GNUNET_YES if peer was a member, #GNUNET_NO if peer was not a member,
483 * #GNUNET_SYSERR if we cannot answer the membership test.
486 GNUNET_MULTICAST_membership_test_result (struct GNUNET_MULTICAST_MembershipTestHandle *mth,
493 * Replay a message fragment for the multicast group.
495 * @param rh Replay handle identifying which replay operation was requested.
496 * @param msg Replayed message fragment, NULL if unknown/error.
497 * @param ec Error code.
500 GNUNET_MULTICAST_replay_response (struct GNUNET_MULTICAST_ReplayHandle *rh,
501 const struct GNUNET_MessageHeader *msg,
502 enum GNUNET_MULTICAST_ReplayErrorCode ec)
508 * Indicate the end of the replay session.
510 * Invalidates the replay handle.
512 * @param rh Replay session to end.
515 GNUNET_MULTICAST_replay_response_end (struct GNUNET_MULTICAST_ReplayHandle *rh)
521 * Replay a message for the multicast group.
523 * @param rh Replay handle identifying which replay operation was requested.
524 * @param notify Function to call to get the message.
525 * @param notify_cls Closure for @a notify.
528 GNUNET_MULTICAST_replay_response2 (struct GNUNET_MULTICAST_ReplayHandle *rh,
529 GNUNET_MULTICAST_ReplayTransmitNotify notify,
536 * Start a multicast group.
538 * Will advertise the origin in the P2P overlay network under the respective
539 * public key so that other peer can find this peer to join it. Peers that
540 * issue GNUNET_MULTICAST_member_join() can then transmit a join request to
541 * either an existing group member or to the origin. If the joining is
542 * approved, the member is cleared for @e replay and will begin to receive
543 * messages transmitted to the group. If joining is disapproved, the failed
544 * candidate will be given a response. Members in the group can send messages
545 * to the origin (one at a time).
547 * @param cfg Configuration to use.
548 * @param priv_key ECC key that will be used to sign messages for this
549 * multicast session; public key is used to identify the multicast group;
550 * @param max_fragment_id Maximum fragment ID already sent to the group.
552 * @param join_request_cb Function called to approve / disapprove joining of a peer.
553 * @param member_test_cb Function multicast can use to test group membership.
554 * @param replay_frag_cb Function that can be called to replay a message fragment.
555 * @param replay_msg_cb Function that can be called to replay a message.
556 * @param request_cb Function called with message fragments from group members.
557 * @param message_cb Function called with the message fragments sent to the
558 * network by GNUNET_MULTICAST_origin_to_all(). These message fragments
559 * should be stored for answering replay requests later.
560 * @param cls Closure for the various callbacks that follow.
562 * @return Handle for the origin, NULL on error.
564 struct GNUNET_MULTICAST_Origin *
565 GNUNET_MULTICAST_origin_start (const struct GNUNET_CONFIGURATION_Handle *cfg,
566 const struct GNUNET_CRYPTO_EddsaPrivateKey *priv_key,
567 uint64_t max_fragment_id,
568 GNUNET_MULTICAST_JoinRequestCallback join_request_cb,
569 GNUNET_MULTICAST_MembershipTestCallback member_test_cb,
570 GNUNET_MULTICAST_ReplayFragmentCallback replay_frag_cb,
571 GNUNET_MULTICAST_ReplayMessageCallback replay_msg_cb,
572 GNUNET_MULTICAST_RequestCallback request_cb,
573 GNUNET_MULTICAST_MessageCallback message_cb,
576 struct GNUNET_MULTICAST_Origin *orig = GNUNET_malloc (sizeof (*orig));
577 struct GNUNET_MULTICAST_Group *grp = &orig->grp;
578 struct MulticastOriginStartMessage *start = GNUNET_malloc (sizeof (*start));
580 start->header.type = htons (GNUNET_MESSAGE_TYPE_MULTICAST_ORIGIN_START);
581 start->header.size = htons (sizeof (*start));
582 start->max_fragment_id = max_fragment_id;
583 memcpy (&start->group_key, priv_key, sizeof (*priv_key));
585 grp->connect_msg = (struct GNUNET_MessageHeader *) start;
586 grp->is_origin = GNUNET_YES;
590 grp->join_req_cb = join_request_cb;
591 grp->member_test_cb = member_test_cb;
592 grp->replay_frag_cb = replay_frag_cb;
593 grp->replay_msg_cb = replay_msg_cb;
594 grp->message_cb = message_cb;
596 orig->request_cb = request_cb;
598 grp->client = GNUNET_CLIENT_MANAGER_connect (cfg, "multicast", origin_handlers);
599 GNUNET_CLIENT_MANAGER_set_user_context_ (grp->client, orig, sizeof (*grp));
600 group_send_connect_msg (grp);
607 * Stop a multicast group.
609 * @param origin Multicast group to stop.
612 GNUNET_MULTICAST_origin_stop (struct GNUNET_MULTICAST_Origin *orig,
613 GNUNET_ContinuationCallback stop_cb,
616 struct GNUNET_MULTICAST_Group *grp = &orig->grp;
618 grp->is_disconnecting = GNUNET_YES;
619 grp->disconnect_cb = stop_cb;
620 grp->disconnect_cls = stop_cls;
622 GNUNET_CLIENT_MANAGER_disconnect (orig->grp.client, GNUNET_YES,
623 &origin_cleanup, orig);
628 origin_to_all (struct GNUNET_MULTICAST_Origin *orig)
630 LOG (GNUNET_ERROR_TYPE_DEBUG, "origin_to_all()\n");
631 struct GNUNET_MULTICAST_Group *grp = &orig->grp;
632 struct GNUNET_MULTICAST_OriginTransmitHandle *tmit = &orig->tmit;
634 size_t buf_size = GNUNET_MULTICAST_FRAGMENT_MAX_SIZE;
635 struct GNUNET_MULTICAST_MessageHeader *msg = GNUNET_malloc (buf_size);
636 int ret = tmit->notify (tmit->notify_cls, &buf_size, &msg[1]);
638 if (! (GNUNET_YES == ret || GNUNET_NO == ret)
639 || GNUNET_MULTICAST_FRAGMENT_MAX_SIZE < buf_size)
641 LOG (GNUNET_ERROR_TYPE_ERROR,
642 "OriginTransmitNotify() returned error or invalid message size.\n");
643 /* FIXME: handle error */
648 if (GNUNET_NO == ret && 0 == buf_size)
651 return; /* Transmission paused. */
654 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MULTICAST_MESSAGE);
655 msg->header.size = htons (sizeof (*msg) + buf_size);
656 msg->message_id = GNUNET_htonll (tmit->message_id);
657 msg->group_generation = tmit->group_generation;
658 msg->fragment_offset = GNUNET_htonll (tmit->fragment_offset);
659 tmit->fragment_offset += sizeof (*msg) + buf_size;
661 GNUNET_CLIENT_MANAGER_transmit (grp->client, &msg->header);
666 * Send a message to the multicast group.
668 * @param orig Handle to the multicast group.
669 * @param message_id Application layer ID for the message. Opaque to multicast.
670 * @param group_generation Group generation of the message.
671 * Documented in struct GNUNET_MULTICAST_MessageHeader.
672 * @param notify Function to call to get the message.
673 * @param notify_cls Closure for @a notify.
675 * @return Message handle on success,
676 * NULL on error (i.e. another request is already pending).
678 struct GNUNET_MULTICAST_OriginTransmitHandle *
679 GNUNET_MULTICAST_origin_to_all (struct GNUNET_MULTICAST_Origin *orig,
681 uint64_t group_generation,
682 GNUNET_MULTICAST_OriginTransmitNotify notify,
686 if (GNUNET_YES == orig->grp.in_transmit)
688 orig->grp.in_transmit = GNUNET_YES;
691 struct GNUNET_MULTICAST_OriginTransmitHandle *tmit = &orig->tmit;
693 tmit->message_id = message_id;
694 tmit->group_generation = group_generation;
695 tmit->notify = notify;
696 tmit->notify_cls = notify_cls;
698 origin_to_all (orig);
704 * Resume message transmission to multicast group.
706 * @param th Transmission to cancel.
709 GNUNET_MULTICAST_origin_to_all_resume (struct GNUNET_MULTICAST_OriginTransmitHandle *th)
711 origin_to_all (th->origin);
716 * Cancel request for message transmission to multicast group.
718 * @param th Transmission to cancel.
721 GNUNET_MULTICAST_origin_to_all_cancel (struct GNUNET_MULTICAST_OriginTransmitHandle *th)
727 * Join a multicast group.
729 * The entity joining is always the local peer. Further information about the
730 * candidate can be provided in the @a join_request message. If the join fails, the
731 * @a message_cb is invoked with a (failure) response and then with NULL. If
732 * the join succeeds, outstanding (state) messages and ongoing multicast
733 * messages will be given to the @a message_cb until the member decides to part
734 * the group. The @a test_cb and @a replay_cb functions may be called at
735 * anytime by the multicast service to support relaying messages to other
736 * members of the group.
738 * @param cfg Configuration to use.
739 * @param group_key ECC public key that identifies the group to join.
740 * @param member_key ECC key that identifies the member and used to sign
741 * requests sent to the origin.
742 * @param origin Peer ID of the origin to send unicast requsets to. If NULL,
743 * unicast requests are sent back via multiple hops on the reverse path
744 * of multicast messages.
745 * @param relay_count Number of peers in the @a relays array.
746 * @param relays Peer identities of members of the group, which serve as relays
747 * and can be used to join the group at. and send the @a join_request to.
748 * If empty, the @a join_request is sent directly to the @a origin.
749 * @param join_msg Application-dependent join message to be passed to the peer
751 * @param join_request_cb Function called to approve / disapprove joining of a peer.
752 * @param join_decision_cb Function called to inform about the join decision.
753 * @param member_test_cb Function multicast can use to test group membership.
754 * @param replay_frag_cb Function that can be called to replay message fragments
755 * this peer already knows from this group. NULL if this
756 * client is unable to support replay.
757 * @param replay_msg_cb Function that can be called to replay message fragments
758 * this peer already knows from this group. NULL if this
759 * client is unable to support replay.
760 * @param message_cb Function to be called for all message fragments we
761 * receive from the group, excluding those our @a replay_cb
763 * @param cls Closure for callbacks.
764 * @return Handle for the member, NULL on error.
766 struct GNUNET_MULTICAST_Member *
767 GNUNET_MULTICAST_member_join (const struct GNUNET_CONFIGURATION_Handle *cfg,
768 const struct GNUNET_CRYPTO_EddsaPublicKey *group_key,
769 const struct GNUNET_CRYPTO_EcdsaPrivateKey *member_key,
770 const struct GNUNET_PeerIdentity *origin,
771 uint16_t relay_count,
772 const struct GNUNET_PeerIdentity *relays,
773 const struct GNUNET_MessageHeader *join_msg,
774 GNUNET_MULTICAST_JoinRequestCallback join_request_cb,
775 GNUNET_MULTICAST_JoinDecisionCallback join_decision_cb,
776 GNUNET_MULTICAST_MembershipTestCallback member_test_cb,
777 GNUNET_MULTICAST_ReplayFragmentCallback replay_frag_cb,
778 GNUNET_MULTICAST_ReplayMessageCallback replay_msg_cb,
779 GNUNET_MULTICAST_MessageCallback message_cb,
782 struct GNUNET_MULTICAST_Member *mem = GNUNET_malloc (sizeof (*mem));
783 struct GNUNET_MULTICAST_Group *grp = &mem->grp;
785 uint16_t relay_size = relay_count * sizeof (*relays);
786 uint16_t join_msg_size = (NULL != join_msg) ? ntohs (join_msg->size) : 0;
787 struct MulticastMemberJoinMessage *
788 join = GNUNET_malloc (sizeof (*join) + relay_size + join_msg_size);
789 join->header.size = htons (sizeof (*join) + relay_size + join_msg_size);
790 join->header.type = htons (GNUNET_MESSAGE_TYPE_MULTICAST_MEMBER_JOIN);
791 join->group_key = *group_key;
792 join->member_key = *member_key;
793 join->origin = *origin;
795 memcpy (&join[1], relays, relay_size);
796 if (0 < join_msg_size)
797 memcpy (((char *) &join[1]) + relay_size, join_msg, join_msg_size);
799 grp->connect_msg = (struct GNUNET_MessageHeader *) join;
800 grp->is_origin = GNUNET_NO;
803 mem->join_dcsn_cb = join_decision_cb;
804 grp->join_req_cb = join_request_cb;
805 grp->member_test_cb = member_test_cb;
806 grp->replay_frag_cb = replay_frag_cb;
807 grp->message_cb = message_cb;
810 grp->client = GNUNET_CLIENT_MANAGER_connect (cfg, "multicast", member_handlers);
811 GNUNET_CLIENT_MANAGER_set_user_context_ (grp->client, mem, sizeof (*grp));
812 group_send_connect_msg (grp);
819 * Part a multicast group.
821 * Disconnects from all group members and invalidates the @a member handle.
823 * An application-dependent part message can be transmitted beforehand using
824 * #GNUNET_MULTICAST_member_to_origin())
826 * @param member Membership handle.
829 GNUNET_MULTICAST_member_part (struct GNUNET_MULTICAST_Member *mem,
830 GNUNET_ContinuationCallback part_cb,
833 struct GNUNET_MULTICAST_Group *grp = &mem->grp;
835 grp->is_disconnecting = GNUNET_YES;
836 grp->disconnect_cb = part_cb;
837 grp->disconnect_cls = part_cls;
839 GNUNET_CLIENT_MANAGER_disconnect (mem->grp.client, GNUNET_YES,
840 &member_cleanup, mem);
845 * Request a fragment to be replayed by fragment ID.
847 * Useful if messages below the @e max_known_fragment_id given when joining are
848 * needed and not known to the client.
850 * @param member Membership handle.
851 * @param fragment_id ID of a message fragment that this client would like to
853 * @param flags Additional flags for the replay request. It is used and defined
854 * by the replay callback. FIXME: which replay callback? FIXME: use enum?
855 * FIXME: why not pass reply cb here?
856 * @return Replay request handle, NULL on error.
858 struct GNUNET_MULTICAST_MemberReplayHandle *
859 GNUNET_MULTICAST_member_replay_fragment (struct GNUNET_MULTICAST_Member *member,
860 uint64_t fragment_id,
868 * Request a message fragment to be replayed.
870 * Useful if messages below the @e max_known_fragment_id given when joining are
871 * needed and not known to the client.
873 * @param member Membership handle.
874 * @param message_id ID of the message this client would like to see replayed.
875 * @param fragment_offset Offset of the fragment within the message to replay.
876 * @param flags Additional flags for the replay request. It is used & defined
877 * by the replay callback.
878 * @param result_cb Function to be called for the replayed message.
879 * @param result_cb_cls Closure for @a result_cb.
880 * @return Replay request handle, NULL on error.
882 struct GNUNET_MULTICAST_MemberReplayHandle *
883 GNUNET_MULTICAST_member_replay_message (struct GNUNET_MULTICAST_Member *member,
885 uint64_t fragment_offset,
887 GNUNET_MULTICAST_ResultCallback result_cb,
895 * Cancel a replay request.
897 * @param rh Request to cancel.
900 GNUNET_MULTICAST_member_replay_cancel (struct GNUNET_MULTICAST_MemberReplayHandle *rh)
906 member_to_origin (struct GNUNET_MULTICAST_Member *mem)
908 LOG (GNUNET_ERROR_TYPE_DEBUG, "member_to_origin()\n");
909 struct GNUNET_MULTICAST_Group *grp = &mem->grp;
910 struct GNUNET_MULTICAST_MemberTransmitHandle *tmit = &mem->tmit;
912 size_t buf_size = GNUNET_MULTICAST_FRAGMENT_MAX_SIZE;
913 struct GNUNET_MULTICAST_RequestHeader *req = GNUNET_malloc (buf_size);
914 int ret = tmit->notify (tmit->notify_cls, &buf_size, &req[1]);
916 if (! (GNUNET_YES == ret || GNUNET_NO == ret)
917 || GNUNET_MULTICAST_FRAGMENT_MAX_SIZE < buf_size)
919 LOG (GNUNET_ERROR_TYPE_ERROR,
920 "MemberTransmitNotify() returned error or invalid message size.\n");
921 /* FIXME: handle error */
926 if (GNUNET_NO == ret && 0 == buf_size)
928 /* Transmission paused. */
933 req->header.type = htons (GNUNET_MESSAGE_TYPE_MULTICAST_REQUEST);
934 req->header.size = htons (sizeof (*req) + buf_size);
935 req->request_id = GNUNET_htonll (tmit->request_id);
936 req->fragment_offset = GNUNET_ntohll (tmit->fragment_offset);
937 tmit->fragment_offset += sizeof (*req) + buf_size;
939 GNUNET_CLIENT_MANAGER_transmit (grp->client, &req->header);
944 * Send a message to the origin of the multicast group.
946 * @param mem Membership handle.
947 * @param request_id Application layer ID for the request. Opaque to multicast.
948 * @param notify Callback to call to get the message.
949 * @param notify_cls Closure for @a notify.
950 * @return Handle to cancel request, NULL on error (i.e. request already pending).
952 struct GNUNET_MULTICAST_MemberTransmitHandle *
953 GNUNET_MULTICAST_member_to_origin (struct GNUNET_MULTICAST_Member *mem,
955 GNUNET_MULTICAST_MemberTransmitNotify notify,
959 if (GNUNET_YES == mem->grp.in_transmit)
961 mem->grp.in_transmit = GNUNET_YES;
964 struct GNUNET_MULTICAST_MemberTransmitHandle *tmit = &mem->tmit;
966 tmit->request_id = request_id;
967 tmit->notify = notify;
968 tmit->notify_cls = notify_cls;
970 member_to_origin (mem);
976 * Resume message transmission to origin.
978 * @param th Transmission to cancel.
981 GNUNET_MULTICAST_member_to_origin_resume (struct GNUNET_MULTICAST_MemberTransmitHandle *th)
983 member_to_origin (th->member);
988 * Cancel request for message transmission to origin.
990 * @param th Transmission to cancel.
993 GNUNET_MULTICAST_member_to_origin_cancel (struct GNUNET_MULTICAST_MemberTransmitHandle *th)
998 /* end of multicast_api.c */