2 This file is part of GNUnet.
3 Copyright (C) 2009, 2010, 2011 Christian Grothoff (and other contributing authors)
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13 General Public License for more details.
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22 * @file core/gnunet-service-core_clients.c
23 * @brief code for managing interactions with clients of core service
24 * @author Christian Grothoff
27 #include "gnunet_util_lib.h"
28 #include "gnunet_statistics_service.h"
29 #include "gnunet_transport_service.h"
30 #include "gnunet-service-core.h"
31 #include "gnunet-service-core_clients.h"
32 #include "gnunet-service-core_neighbours.h"
33 #include "gnunet-service-core_sessions.h"
34 #include "gnunet-service-core_typemap.h"
39 * How many messages do we queue up at most for optional
40 * notifications to a client? (this can cause notifications
41 * about outgoing messages to be dropped).
43 #define MAX_NOTIFY_QUEUE 1024
47 * Data structure for each client connected to the CORE service.
52 * Clients are kept in a linked list.
54 struct GSC_Client *next;
57 * Clients are kept in a linked list.
59 struct GSC_Client *prev;
62 * Handle for the client with the server API.
64 struct GNUNET_SERVER_Client *client_handle;
67 * Array of the types of messages this peer cares
68 * about (with @e tcnt entries). Allocated as part
69 * of this client struct, do not free!
71 const uint16_t *types;
74 * Map of peer identities to active transmission requests of this
75 * client to the peer (of type `struct GSC_ClientActiveRequest`).
77 struct GNUNET_CONTAINER_MultiPeerMap *requests;
80 * Map containing all peers that this client knows we're connected to.
82 struct GNUNET_CONTAINER_MultiPeerMap *connectmap;
85 * Options for messages this client cares about,
86 * see GNUNET_CORE_OPTION_ values.
91 * Number of types of incoming messages this client
92 * specifically cares about. Size of the @e types array.
100 * Big "or" of all client options.
102 static uint32_t all_client_options;
105 * Head of linked list of our clients.
107 static struct GSC_Client *client_head;
110 * Tail of linked list of our clients.
112 static struct GSC_Client *client_tail;
115 * Context for notifications we need to send to our clients.
117 static struct GNUNET_SERVER_NotificationContext *notifier;
120 * Tokenizer for messages received from clients.
122 static struct GNUNET_SERVER_MessageStreamTokenizer *client_mst;
126 * Lookup our client struct given the server's client handle.
128 * @param client server client handle to look up
129 * @return our client handle for the client
131 static struct GSC_Client *
132 find_client (struct GNUNET_SERVER_Client *client)
134 struct GSC_Client *c;
137 while ((c != NULL) && (c->client_handle != client))
144 * Send a message to one of our clients.
146 * @param client target for the message
147 * @param msg message to transmit
148 * @param can_drop could this message be dropped if the
149 * client's queue is getting too large?
152 send_to_client (struct GSC_Client *client,
153 const struct GNUNET_MessageHeader *msg,
156 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
157 "Preparing to send %u bytes of message of type %u to client.\n",
158 (unsigned int) ntohs (msg->size),
159 (unsigned int) ntohs (msg->type));
160 GNUNET_SERVER_notification_context_unicast (notifier, client->client_handle,
166 * Send a message to one of our clients.
168 * @param client target for the message
169 * @param msg message to transmit
170 * @param can_drop could this message be dropped if the
171 * client's queue is getting too large?
174 GSC_CLIENTS_send_to_client (struct GNUNET_SERVER_Client *client,
175 const struct GNUNET_MessageHeader *msg,
178 struct GSC_Client *c;
180 c = find_client (client);
186 send_to_client (c, msg, can_drop);
191 * Test if the client is interested in messages of the given type.
193 * @param type message type
194 * @param c client to test
195 * @return #GNUNET_YES if @a c is interested, #GNUNET_NO if not.
198 type_match (uint16_t type, struct GSC_Client *c)
203 return GNUNET_YES; /* peer without handlers matches ALL */
204 for (i = 0; i < c->tcnt; i++)
205 if (type == c->types[i])
212 * Send a message to all of our current clients that have the right
215 * @param partner origin (or destination) of the message (used to check that this peer is
216 * known to be connected to the respective client)
217 * @param msg message to multicast
218 * @param can_drop can this message be discarded if the queue is too long
219 * @param options mask to use
220 * @param type type of the embedded message, 0 for none
223 send_to_all_clients (const struct GNUNET_PeerIdentity *partner,
224 const struct GNUNET_MessageHeader *msg,
229 struct GSC_Client *c;
232 for (c = client_head; NULL != c; c = c->next)
234 tm = type_match (type, c);
235 if (! ( (0 != (c->options & options)) ||
236 ( (0 != (options & GNUNET_CORE_OPTION_SEND_FULL_INBOUND)) &&
237 (GNUNET_YES == tm) ) ) )
238 continue; /* neither options nor type match permit the message */
239 if ( (0 != (options & GNUNET_CORE_OPTION_SEND_HDR_INBOUND)) &&
240 ( (0 != (c->options & GNUNET_CORE_OPTION_SEND_FULL_INBOUND)) ||
241 (GNUNET_YES == tm) ) )
243 if ( (0 != (options & GNUNET_CORE_OPTION_SEND_HDR_OUTBOUND)) &&
244 (0 != (c->options & GNUNET_CORE_OPTION_SEND_FULL_OUTBOUND)) )
246 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
247 "Sending %u message with %u bytes to client interested in messages of type %u.\n",
250 (unsigned int) type);
251 GNUNET_assert ( (0 == (c->options & GNUNET_CORE_OPTION_SEND_FULL_INBOUND)) ||
252 (GNUNET_YES != tm) ||
254 GNUNET_CONTAINER_multipeermap_contains (c->connectmap,
256 send_to_client (c, msg, can_drop);
262 * Handle #GNUNET_MESSAGE_TYPE_CORE_INIT request.
265 * @param client new client that sent #GNUNET_MESSAGE_TYPE_CORE_INIT
266 * @param message the `struct InitMessage` (presumably)
269 handle_client_init (void *cls,
270 struct GNUNET_SERVER_Client *client,
271 const struct GNUNET_MessageHeader *message)
273 const struct InitMessage *im;
274 struct InitReplyMessage irm;
275 struct GSC_Client *c;
277 const uint16_t *types;
281 /* check that we don't have an entry already */
282 c = find_client (client);
286 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
289 msize = ntohs (message->size);
290 if (msize < sizeof (struct InitMessage))
293 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
296 GNUNET_SERVER_notification_context_add (notifier, client);
297 im = (const struct InitMessage *) message;
298 types = (const uint16_t *) &im[1];
299 msize -= sizeof (struct InitMessage);
300 c = GNUNET_malloc (sizeof (struct GSC_Client) + msize);
301 c->client_handle = client;
302 c->tcnt = msize / sizeof (uint16_t);
303 c->options = ntohl (im->options);
304 all_client_options |= c->options;
305 c->types = (const uint16_t *) &c[1];
306 c->connectmap = GNUNET_CONTAINER_multipeermap_create (16, GNUNET_NO);
307 GNUNET_assert (GNUNET_YES ==
308 GNUNET_CONTAINER_multipeermap_put (c->connectmap,
311 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
312 wtypes = (uint16_t *) & c[1];
313 for (i = 0; i < c->tcnt; i++)
314 wtypes[i] = ntohs (types[i]);
315 GSC_TYPEMAP_add (wtypes, c->tcnt);
316 GNUNET_CONTAINER_DLL_insert (client_head, client_tail, c);
317 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
318 "Client connecting to core service is interested in %u message types\n",
319 (unsigned int) c->tcnt);
320 /* send init reply message */
321 irm.header.size = htons (sizeof (struct InitReplyMessage));
322 irm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_INIT_REPLY);
323 irm.reserved = htonl (0);
324 irm.my_identity = GSC_my_identity;
325 send_to_client (c, &irm.header, GNUNET_NO);
326 GSC_SESSIONS_notify_client_about_sessions (c);
327 GNUNET_SERVER_receive_done (client, GNUNET_OK);
332 * Handle #GNUNET_MESSAGE_TYPE_CORE_SEND_REQUEST message.
335 * @param client new client that sent a #GNUNET_MESSAGE_TYPE_CORE_SEND_REQUEST
336 * @param message the `struct SendMessageRequest` (presumably)
339 handle_client_send_request (void *cls,
340 struct GNUNET_SERVER_Client *client,
341 const struct GNUNET_MessageHeader *message)
343 const struct SendMessageRequest *req;
344 struct GSC_Client *c;
345 struct GSC_ClientActiveRequest *car;
348 req = (const struct SendMessageRequest *) message;
349 c = find_client (client);
352 /* client did not send INIT first! */
354 GNUNET_SERVER_receive_done (client,
358 if (NULL == c->requests)
359 c->requests = GNUNET_CONTAINER_multipeermap_create (16,
361 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
362 "Client asked for transmission to `%s'\n",
363 GNUNET_i2s (&req->peer));
368 sizeof (struct GNUNET_PeerIdentity)));
369 if ((! is_loopback) &&
371 GNUNET_CONTAINER_multipeermap_contains (c->connectmap,
374 /* neighbour must have disconnected since request was issued,
375 * ignore (client will realize it once it processes the
376 * disconnect notification) */
377 GNUNET_STATISTICS_update (GSC_stats,
379 ("# send requests dropped (disconnected)"), 1,
381 GNUNET_SERVER_receive_done (client,
386 car = GNUNET_CONTAINER_multipeermap_get (c->requests,
390 /* create new entry */
391 car = GNUNET_new (struct GSC_ClientActiveRequest);
392 GNUNET_assert (GNUNET_OK ==
393 GNUNET_CONTAINER_multipeermap_put (c->requests,
396 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST));
397 car->client_handle = c;
401 /* dequeue and recycle memory from pending request, there can only
402 be at most one per client and peer */
403 GSC_SESSIONS_dequeue_request (car);
405 car->target = req->peer;
406 car->received_time = GNUNET_TIME_absolute_get ();
407 car->deadline = GNUNET_TIME_absolute_ntoh (req->deadline);
408 car->priority = (enum GNUNET_CORE_Priority) ntohl (req->priority);
409 car->msize = ntohs (req->size);
410 car->smr_id = req->smr_id;
411 car->was_solicited = GNUNET_NO;
414 /* loopback, satisfy immediately */
415 GSC_CLIENTS_solicit_request (car);
416 GNUNET_SERVER_receive_done (client, GNUNET_OK);
419 GSC_SESSIONS_queue_request (car);
420 GNUNET_SERVER_receive_done (client, GNUNET_OK);
425 * Closure for the #client_tokenizer_callback().
427 struct TokenizerContext
431 * Active request handle for the message.
433 struct GSC_ClientActiveRequest *car;
436 * How important is this message.
438 enum GNUNET_CORE_Priority priority;
441 * Is corking allowed (set only once we have the real message).
449 * Handle #GNUNET_MESSAGE_TYPE_CORE_SEND request.
452 * @param client the client issuing the request
453 * @param message the `struct SendMessage`
456 handle_client_send (void *cls,
457 struct GNUNET_SERVER_Client *client,
458 const struct GNUNET_MessageHeader *message)
460 const struct SendMessage *sm;
461 struct GSC_Client *c;
462 struct TokenizerContext tc;
464 struct GNUNET_TIME_Relative delay;
465 struct GNUNET_TIME_Relative overdue;
467 msize = ntohs (message->size);
468 if (msize < sizeof (struct SendMessage))
471 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
474 sm = (const struct SendMessage *) message;
475 msize -= sizeof (struct SendMessage);
476 GNUNET_break (0 == ntohl (sm->reserved));
477 c = find_client (client);
480 /* client did not send INIT first! */
482 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
486 = GNUNET_CONTAINER_multipeermap_get (c->requests,
490 /* Must have been that we first approved the request, then got disconnected
491 * (which triggered removal of the 'car') and now the client gives us a message
492 * just *before* the client learns about the disconnect. Theoretically, we
493 * might also now be *again* connected. So this can happen (but should be
494 * rare). If it does happen, the message is discarded. */
495 GNUNET_STATISTICS_update (GSC_stats,
497 ("# messages discarded (session disconnected)"),
499 GNUNET_SERVER_receive_done (client,
503 delay = GNUNET_TIME_absolute_get_duration (tc.car->received_time);
504 overdue = GNUNET_TIME_absolute_get_duration (tc.car->deadline);
505 tc.cork = ntohl (sm->cork);
506 tc.priority = (enum GNUNET_CORE_Priority) ntohl (sm->priority);
507 if (overdue.rel_value_us > GNUNET_CONSTANTS_LATENCY_WARN.rel_value_us)
508 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
509 "Client waited %s for transmission of %u bytes to `%s'%s\n",
510 GNUNET_STRINGS_relative_time_to_string (delay,
513 GNUNET_i2s (&sm->peer),
514 tc.cork ? "" : " (corked)");
516 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
517 "Client waited %s for transmission of %u bytes to `%s'%s\n",
518 GNUNET_STRINGS_relative_time_to_string (delay,
521 GNUNET_i2s (&sm->peer),
522 tc.cork ? "" : " (corked)");
524 GNUNET_assert (GNUNET_YES ==
525 GNUNET_CONTAINER_multipeermap_remove (c->requests,
528 GNUNET_SERVER_mst_receive (client_mst, &tc,
529 (const char *) &sm[1],
533 GSC_SESSIONS_dequeue_request (tc.car);
534 GNUNET_free (tc.car);
535 GNUNET_SERVER_receive_done (client,
541 * Functions with this signature are called whenever a complete
542 * message is received by the tokenizer. Used by the 'client_mst' for
543 * dispatching messages from clients to either the SESSION subsystem
544 * or other CLIENT (for loopback).
547 * @param client reservation request (`struct GSC_ClientActiveRequest`)
548 * @param message the actual message
551 client_tokenizer_callback (void *cls,
553 const struct GNUNET_MessageHeader *message)
555 struct TokenizerContext *tc = client;
556 struct GSC_ClientActiveRequest *car = tc->car;
559 GNUNET_snprintf (buf, sizeof (buf),
560 gettext_noop ("# bytes of messages of type %u received"),
561 (unsigned int) ntohs (message->type));
562 GNUNET_STATISTICS_update (GSC_stats,
564 ntohs (message->size),
567 memcmp (&car->target,
569 sizeof (struct GNUNET_PeerIdentity)))
571 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
572 "Delivering message of type %u to myself\n",
573 ntohs (message->type));
574 GSC_CLIENTS_deliver_message (&GSC_my_identity, message,
575 ntohs (message->size),
576 GNUNET_CORE_OPTION_SEND_FULL_OUTBOUND);
577 GSC_CLIENTS_deliver_message (&GSC_my_identity, message,
578 sizeof (struct GNUNET_MessageHeader),
579 GNUNET_CORE_OPTION_SEND_HDR_OUTBOUND);
580 GSC_CLIENTS_deliver_message (&GSC_my_identity, message,
581 ntohs (message->size),
582 GNUNET_CORE_OPTION_SEND_FULL_INBOUND);
583 GSC_CLIENTS_deliver_message (&GSC_my_identity, message,
584 sizeof (struct GNUNET_MessageHeader),
585 GNUNET_CORE_OPTION_SEND_HDR_INBOUND);
589 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
590 "Delivering message of type %u and size %u to %s\n",
591 ntohs (message->type), ntohs (message->size),
592 GNUNET_i2s (&car->target));
593 GSC_CLIENTS_deliver_message (&car->target, message,
594 ntohs (message->size),
595 GNUNET_CORE_OPTION_SEND_FULL_OUTBOUND);
596 GSC_CLIENTS_deliver_message (&car->target, message,
597 sizeof (struct GNUNET_MessageHeader),
598 GNUNET_CORE_OPTION_SEND_HDR_OUTBOUND);
599 GSC_SESSIONS_transmit (car,
609 * Free client request records.
612 * @param key identity of peer for which this is an active request
613 * @param value the `struct GSC_ClientActiveRequest` to free
614 * @return #GNUNET_YES (continue iteration)
617 destroy_active_client_request (void *cls,
618 const struct GNUNET_PeerIdentity *key,
621 struct GSC_ClientActiveRequest *car = value;
623 GNUNET_assert (GNUNET_YES ==
624 GNUNET_CONTAINER_multipeermap_remove (car->
625 client_handle->requests,
628 GSC_SESSIONS_dequeue_request (car);
635 * A client disconnected, clean up.
638 * @param client identification of the client
641 handle_client_disconnect (void *cls,
642 struct GNUNET_SERVER_Client *client)
644 struct GSC_Client *c;
648 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
649 "Client %p has disconnected from core service.\n",
651 c = find_client (client);
653 return; /* client never sent INIT */
654 GNUNET_CONTAINER_DLL_remove (client_head, client_tail, c);
655 if (c->requests != NULL)
657 GNUNET_CONTAINER_multipeermap_iterate (c->requests,
658 &destroy_active_client_request,
660 GNUNET_CONTAINER_multipeermap_destroy (c->requests);
662 GNUNET_CONTAINER_multipeermap_destroy (c->connectmap);
663 c->connectmap = NULL;
664 GSC_TYPEMAP_remove (c->types, c->tcnt);
667 /* recalculate 'all_client_options' */
668 all_client_options = 0;
669 for (c = client_head; NULL != c ; c = c->next)
670 all_client_options |= c->options;
675 * Tell a client that we are ready to receive the message.
677 * @param car request that is now ready; the responsibility
678 * for the handle remains shared between CLIENTS
679 * and SESSIONS after this call.
682 GSC_CLIENTS_solicit_request (struct GSC_ClientActiveRequest *car)
684 struct GSC_Client *c;
685 struct SendMessageReady smr;
686 struct GNUNET_TIME_Relative delay;
687 struct GNUNET_TIME_Relative left;
689 c = car->client_handle;
691 GNUNET_CONTAINER_multipeermap_contains (c->connectmap,
694 /* connection has gone down since, drop request */
696 memcmp (&car->target,
698 sizeof (struct GNUNET_PeerIdentity)));
699 GSC_SESSIONS_dequeue_request (car);
700 GSC_CLIENTS_reject_request (car,
704 delay = GNUNET_TIME_absolute_get_duration (car->received_time);
705 left = GNUNET_TIME_absolute_get_duration (car->deadline);
706 if (left.rel_value_us > GNUNET_CONSTANTS_LATENCY_WARN.rel_value_us)
707 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
708 "Client waited %s for permission to transmit to `%s'%s (priority %u)\n",
709 GNUNET_STRINGS_relative_time_to_string (delay,
711 GNUNET_i2s (&car->target),
712 (0 == left.rel_value_us)
716 smr.header.size = htons (sizeof (struct SendMessageReady));
717 smr.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_SEND_READY);
718 smr.size = htons (car->msize);
719 smr.smr_id = car->smr_id;
720 smr.peer = car->target;
721 send_to_client (c, &smr.header, GNUNET_NO);
726 * We will never be ready to transmit the given message in (disconnect
727 * or invalid request). Frees resources associated with @a car. We
728 * don't explicitly tell the client, he'll learn with the disconnect
729 * (or violated the protocol).
731 * @param car request that now permanently failed; the
732 * responsibility for the handle is now returned
733 * to CLIENTS (SESSIONS is done with it).
734 * @param drop_client #GNUNET_YES if the client violated the protocol
735 * and we should thus drop the connection
738 GSC_CLIENTS_reject_request (struct GSC_ClientActiveRequest *car,
741 GNUNET_assert (GNUNET_YES ==
742 GNUNET_CONTAINER_multipeermap_remove (car->
743 client_handle->requests,
746 if (GNUNET_YES == drop_client)
747 GNUNET_SERVER_client_disconnect (car->client_handle->client_handle);
753 * Notify a particular client about a change to existing connection to
754 * one of our neighbours (check if the client is interested). Called
755 * from 'GSC_SESSIONS_notify_client_about_sessions'.
757 * @param client client to notify
758 * @param neighbour identity of the neighbour that changed status
759 * @param tmap_old previous type map for the neighbour, NULL for connect
760 * @param tmap_new updated type map for the neighbour, NULL for disconnect
763 GSC_CLIENTS_notify_client_about_neighbour (struct GSC_Client *client,
764 const struct GNUNET_PeerIdentity *neighbour,
765 const struct GSC_TypeMap *tmap_old,
766 const struct GSC_TypeMap *tmap_new)
768 struct ConnectNotifyMessage *cnm;
770 char buf[GNUNET_SERVER_MAX_MESSAGE_SIZE - 1] GNUNET_ALIGN;
771 struct DisconnectNotifyMessage dcm;
775 old_match = GSC_TYPEMAP_test_match (tmap_old, client->types, client->tcnt);
776 new_match = GSC_TYPEMAP_test_match (tmap_new, client->types, client->tcnt);
777 if (old_match == new_match)
779 GNUNET_assert (old_match ==
780 GNUNET_CONTAINER_multipeermap_contains (client->connectmap,
782 return; /* no change */
784 if (old_match == GNUNET_NO)
787 GNUNET_assert (GNUNET_NO ==
788 GNUNET_CONTAINER_multipeermap_contains (client->connectmap,
790 GNUNET_assert (GNUNET_YES ==
791 GNUNET_CONTAINER_multipeermap_put (client->connectmap,
794 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
795 size = sizeof (struct ConnectNotifyMessage);
796 cnm = (struct ConnectNotifyMessage *) buf;
797 cnm->header.size = htons (size);
798 cnm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT);
799 cnm->reserved = htonl (0);
800 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
801 "Sending `%s' message to client.\n",
803 cnm->peer = *neighbour;
804 send_to_client (client, &cnm->header, GNUNET_NO);
808 /* send disconnect */
809 GNUNET_assert (GNUNET_YES ==
810 GNUNET_CONTAINER_multipeermap_contains (client->connectmap,
812 GNUNET_assert (GNUNET_YES ==
813 GNUNET_CONTAINER_multipeermap_remove (client->connectmap,
816 dcm.header.size = htons (sizeof (struct DisconnectNotifyMessage));
817 dcm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_DISCONNECT);
818 dcm.reserved = htonl (0);
819 dcm.peer = *neighbour;
820 send_to_client (client, &dcm.header, GNUNET_NO);
826 * Notify all clients about a change to existing session.
827 * Called from SESSIONS whenever there is a change in sessions
828 * or types processed by the respective peer.
830 * @param neighbour identity of the neighbour that changed status
831 * @param tmap_old previous type map for the neighbour, NULL for connect
832 * @param tmap_new updated type map for the neighbour, NULL for disconnect
835 GSC_CLIENTS_notify_clients_about_neighbour (const struct GNUNET_PeerIdentity *neighbour,
836 const struct GSC_TypeMap *tmap_old,
837 const struct GSC_TypeMap *tmap_new)
839 struct GSC_Client *c;
841 for (c = client_head; NULL != c; c = c->next)
842 GSC_CLIENTS_notify_client_about_neighbour (c, neighbour,
848 * Deliver P2P message to interested clients. Caller must have checked
849 * that the sending peer actually lists the given message type as one
852 * @param sender peer who sent us the message
853 * @param msg the message
854 * @param msize number of bytes to transmit
855 * @param options options for checking which clients should
856 * receive the message
859 GSC_CLIENTS_deliver_message (const struct GNUNET_PeerIdentity *sender,
860 const struct GNUNET_MessageHeader *msg,
864 size_t size = msize + sizeof (struct NotifyTrafficMessage);
865 char buf[size] GNUNET_ALIGN;
866 struct NotifyTrafficMessage *ntm;
868 if (size >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
871 /* recovery strategy: throw performance data away... */
872 size = msize + sizeof (struct NotifyTrafficMessage);
874 if (! ( (0 != (all_client_options & options)) ||
875 (0 != (options & GNUNET_CORE_OPTION_SEND_FULL_INBOUND)) ))
876 return; /* no client cares about this message notification */
877 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
878 "Core service passes message from `%4s' of type %u to client.\n",
880 (unsigned int) ntohs (msg->type));
881 GSC_SESSIONS_add_to_typemap (sender, ntohs (msg->type));
882 ntm = (struct NotifyTrafficMessage *) buf;
883 ntm->header.size = htons (size);
884 if (0 != (options & (GNUNET_CORE_OPTION_SEND_FULL_INBOUND | GNUNET_CORE_OPTION_SEND_HDR_INBOUND)))
885 ntm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_INBOUND);
887 ntm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_OUTBOUND);
892 send_to_all_clients (sender,
901 * Initialize clients subsystem.
903 * @param server handle to server clients connect to
906 GSC_CLIENTS_init (struct GNUNET_SERVER_Handle *server)
908 static const struct GNUNET_SERVER_MessageHandler handlers[] = {
909 {&handle_client_init, NULL,
910 GNUNET_MESSAGE_TYPE_CORE_INIT, 0},
911 {&GSC_KX_handle_client_monitor_peers, NULL,
912 GNUNET_MESSAGE_TYPE_CORE_MONITOR_PEERS,
913 sizeof (struct GNUNET_MessageHeader)},
914 {&handle_client_send_request, NULL,
915 GNUNET_MESSAGE_TYPE_CORE_SEND_REQUEST,
916 sizeof (struct SendMessageRequest)},
917 {&handle_client_send, NULL,
918 GNUNET_MESSAGE_TYPE_CORE_SEND, 0},
922 /* setup notification */
923 client_mst = GNUNET_SERVER_mst_create (&client_tokenizer_callback, NULL);
925 GNUNET_SERVER_notification_context_create (server, MAX_NOTIFY_QUEUE);
926 GNUNET_SERVER_disconnect_notify (server,
927 &handle_client_disconnect, NULL);
928 GNUNET_SERVER_add_handlers (server, handlers);
933 * Shutdown clients subsystem.
938 struct GSC_Client *c;
940 while (NULL != (c = client_head))
941 handle_client_disconnect (NULL, c->client_handle);
942 if (NULL != notifier)
944 GNUNET_SERVER_notification_context_destroy (notifier);
947 if (NULL != client_mst)
949 GNUNET_SERVER_mst_destroy (client_mst);
954 /* end of gnunet-service-core_clients.c */