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3 (C) 2010,2011 Christian Grothoff (and other contributing authors)
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22 * @file transport/gnunet-service-transport_clients.c
23 * @brief plugin management API
24 * @author Christian Grothoff
27 #include "gnunet-service-transport_blacklist.h"
28 #include "gnunet-service-transport_clients.h"
29 #include "gnunet-service-transport_hello.h"
30 #include "gnunet-service-transport_neighbours.h"
31 #include "gnunet-service-transport_plugins.h"
32 #include "gnunet-service-transport_validation.h"
33 #include "gnunet-service-transport.h"
34 #include "transport.h"
37 * How many messages can we have pending for a given client process
38 * before we start to drop incoming messages? We typically should
39 * have only one client and so this would be the primary buffer for
40 * messages, so the number should be chosen rather generously.
42 * The expectation here is that most of the time the queue is large
43 * enough so that a drop is virtually never required. Note that
44 * this value must be about as large as 'TOTAL_MSGS' in the
45 * 'test_transport_api_reliability.c', otherwise that testcase may
48 #define MAX_PENDING (128 * 1024)
52 * Linked list of messages to be transmitted to the client. Each
53 * entry is followed by the actual message.
55 struct ClientMessageQueueEntry
58 * This is a doubly-linked list.
60 struct ClientMessageQueueEntry *next;
63 * This is a doubly-linked list.
65 struct ClientMessageQueueEntry *prev;
70 * Client connected to the transport service.
72 struct TransportClient
76 * This is a doubly-linked list.
78 struct TransportClient *next;
81 * This is a doubly-linked list.
83 struct TransportClient *prev;
86 * Handle to the client.
88 struct GNUNET_SERVER_Client *client;
91 * Linked list of messages yet to be transmitted to
94 struct ClientMessageQueueEntry *message_queue_head;
97 * Tail of linked list of messages yet to be transmitted to the
100 struct ClientMessageQueueEntry *message_queue_tail;
103 * Current transmit request handle.
105 struct GNUNET_CONNECTION_TransmitHandle *th;
108 * Length of the list of messages pending for this client.
110 unsigned int message_count;
113 * Is this client interested in payload messages?
120 * Head of linked list of all clients to this service.
122 static struct TransportClient *clients_head;
125 * Tail of linked list of all clients to this service.
127 static struct TransportClient *clients_tail;
130 * Find the internal handle associated with the given client handle
132 * @param client server's client handle to look up
133 * @return internal client handle
135 static struct TransportClient *
136 lookup_client (struct GNUNET_SERVER_Client *client)
138 struct TransportClient *tc;
143 if (tc->client == client)
152 * Create the internal handle for the given server client handle
154 * @param client server's client handle to create our internal handle for
155 * @return fresh internal client handle
157 static struct TransportClient *
158 setup_client (struct GNUNET_SERVER_Client *client)
160 struct TransportClient *tc;
162 GNUNET_assert (lookup_client (client) == NULL);
163 tc = GNUNET_malloc (sizeof (struct TransportClient));
165 GNUNET_CONTAINER_DLL_insert (clients_head, clients_tail, tc);
168 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
169 "Client %X connected\n", tc);
176 * Function called to notify a client about the socket being ready to
177 * queue more data. "buf" will be NULL and "size" zero if the socket
178 * was closed for writing in the meantime.
181 * @param size number of bytes available in buf
182 * @param buf where the callee should write the message
183 * @return number of bytes written to buf
186 transmit_to_client_callback (void *cls, size_t size, void *buf)
188 struct TransportClient *tc = cls;
189 struct ClientMessageQueueEntry *q;
190 const struct GNUNET_MessageHeader *msg;
199 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
200 "Transmission to client failed, closing connection.\n");
206 while (NULL != (q = tc->message_queue_head))
208 msg = (const struct GNUNET_MessageHeader *) &q[1];
209 msize = ntohs (msg->size);
210 if (msize + tsize > size)
213 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
214 "Transmitting message of type %u to client %X.\n",
215 ntohs (msg->type), tc);
217 GNUNET_CONTAINER_DLL_remove (tc->message_queue_head, tc->message_queue_tail,
220 memcpy (&cbuf[tsize], msg, msize);
226 GNUNET_assert (msize >= sizeof (struct GNUNET_MessageHeader));
228 GNUNET_SERVER_notify_transmit_ready (tc->client, msize,
229 GNUNET_TIME_UNIT_FOREVER_REL,
230 &transmit_to_client_callback, tc);
231 GNUNET_assert (tc->th != NULL);
238 * Queue the given message for transmission to the given client
240 * @param tc target of the message
241 * @param msg message to transmit
242 * @param may_drop GNUNET_YES if the message can be dropped
245 unicast (struct TransportClient *tc, const struct GNUNET_MessageHeader *msg,
248 struct ClientMessageQueueEntry *q;
251 if ((tc->message_count >= MAX_PENDING) && (GNUNET_YES == may_drop))
253 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
255 ("Dropping message of type %u and size %u, have %u/%u messages pending\n"),
256 ntohs (msg->type), ntohs (msg->size), tc->message_count,
258 GNUNET_STATISTICS_update (GST_stats,
260 ("# messages dropped due to slow client"), 1,
264 msize = ntohs (msg->size);
265 GNUNET_assert (msize >= sizeof (struct GNUNET_MessageHeader));
266 q = GNUNET_malloc (sizeof (struct ClientMessageQueueEntry) + msize);
267 memcpy (&q[1], msg, msize);
268 GNUNET_CONTAINER_DLL_insert_tail (tc->message_queue_head,
269 tc->message_queue_tail, q);
274 GNUNET_SERVER_notify_transmit_ready (tc->client, msize,
275 GNUNET_TIME_UNIT_FOREVER_REL,
276 &transmit_to_client_callback, tc);
277 GNUNET_assert (tc->th != NULL);
282 * Called whenever a client is disconnected. Frees our
283 * resources associated with that client.
286 * @param client identification of the client
289 client_disconnect_notification (void *cls, struct GNUNET_SERVER_Client *client)
291 struct TransportClient *tc;
292 struct ClientMessageQueueEntry *mqe;
296 tc = lookup_client (client);
300 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
301 "Client %X disconnected, cleaning up.\n", tc);
303 while (NULL != (mqe = tc->message_queue_head))
305 GNUNET_CONTAINER_DLL_remove (tc->message_queue_head, tc->message_queue_tail,
310 GNUNET_CONTAINER_DLL_remove (clients_head, clients_tail, tc);
313 GNUNET_CONNECTION_notify_transmit_ready_cancel (tc->th);
316 GNUNET_break (0 == tc->message_count);
322 * Function called for each of our connected neighbours. Notify the
323 * client about the existing neighbour.
325 * @param cls the 'struct TransportClient' to notify
326 * @param peer identity of the neighbour
327 * @param ats performance data
328 * @param ats_count number of entries in ats (excluding 0-termination)
329 * @param transport plugin
330 * @param addr address
331 * @param addrlen address length
334 notify_client_about_neighbour (void *cls,
335 const struct GNUNET_PeerIdentity *peer,
336 const struct GNUNET_ATS_Information
337 *ats, uint32_t ats_count,
338 const char * transport,
342 struct TransportClient *tc = cls;
343 struct ConnectInfoMessage *cim;
344 struct GNUNET_ATS_Information *ap;
346 sizeof (struct ConnectInfoMessage) +
347 ats_count * sizeof (struct GNUNET_ATS_Information);
350 GNUNET_assert (size < GNUNET_SERVER_MAX_MESSAGE_SIZE);
351 cim = (struct ConnectInfoMessage*) buf;
352 cim->header.size = htons (size);
353 cim->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT);
354 cim->ats_count = htonl (ats_count);
356 ap = (struct GNUNET_ATS_Information *) &cim[1];
358 ats_count * sizeof (struct GNUNET_ATS_Information));
359 unicast (tc, &cim->header, GNUNET_NO);
364 * Initialize a normal client. We got a start message from this
365 * client, add him to the list of clients for broadcasting of inbound
369 * @param client the client
370 * @param message the start message that was sent
373 clients_handle_start (void *cls, struct GNUNET_SERVER_Client *client,
374 const struct GNUNET_MessageHeader *message)
376 const struct StartMessage *start;
377 struct TransportClient *tc;
380 tc = lookup_client (client);
384 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
385 "Client %X sent START\n", tc);
387 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
388 "Client %X sent START\n", tc);
392 /* got 'start' twice from the same client, not allowed */
394 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
395 "TransportClient %X ServerClient %X sent multiple START messages\n",
399 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
402 start = (const struct StartMessage *) message;
403 options = ntohl (start->options);
404 if ((0 != (1 & options) ) &&
406 memcmp (&start->self, &GST_my_identity,
407 sizeof (struct GNUNET_PeerIdentity))))
409 /* client thinks this is a different peer, reject */
410 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
412 ("Rejecting control connection from peer `%s', which is not me!\n"),
413 GNUNET_i2s (&start->self));
414 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
417 tc = setup_client (client);
418 tc->send_payload = (0 != (2 & options));
419 unicast (tc, GST_hello_get (), GNUNET_NO);
420 GST_neighbours_iterate (¬ify_client_about_neighbour, tc);
421 GNUNET_SERVER_receive_done (client, GNUNET_OK);
426 * Client sent us a HELLO. Process the request.
429 * @param client the client
430 * @param message the HELLO message
433 clients_handle_hello (void *cls, struct GNUNET_SERVER_Client *client,
434 const struct GNUNET_MessageHeader *message)
436 GST_validation_handle_hello (message);
437 GNUNET_SERVER_receive_done (client, GNUNET_OK);
442 * Closure for 'handle_send_transmit_continuation'
444 struct SendTransmitContinuationContext
447 * Client that made the request.
449 struct GNUNET_SERVER_Client *client;
452 * Peer that was the target.
454 struct GNUNET_PeerIdentity target;
459 * Function called after the transmission is done. Notify the client that it is
460 * OK to send the next message.
463 * @param success GNUNET_OK on success, GNUNET_NO on failure, GNUNET_SYSERR if we're not connected
466 handle_send_transmit_continuation (void *cls, int success)
468 struct SendTransmitContinuationContext *stcc = cls;
469 struct SendOkMessage send_ok_msg;
471 send_ok_msg.header.size = htons (sizeof (send_ok_msg));
472 send_ok_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SEND_OK);
473 send_ok_msg.success = htonl (success);
474 send_ok_msg.latency =
475 GNUNET_TIME_relative_hton (GNUNET_TIME_UNIT_FOREVER_REL);
476 send_ok_msg.peer = stcc->target;
477 GST_clients_unicast (stcc->client, &send_ok_msg.header, GNUNET_NO);
478 GNUNET_SERVER_client_drop (stcc->client);
484 * Client asked for transmission to a peer. Process the request.
487 * @param client the client
488 * @param message the send message that was sent
491 clients_handle_send (void *cls, struct GNUNET_SERVER_Client *client,
492 const struct GNUNET_MessageHeader *message)
494 const struct OutboundMessage *obm;
495 const struct GNUNET_MessageHeader *obmm;
496 struct SendTransmitContinuationContext *stcc;
499 struct TransportClient *tc;
501 tc = lookup_client (client);
504 /* client asked for transmission before 'START' */
506 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
510 size = ntohs (message->size);
512 sizeof (struct OutboundMessage) + sizeof (struct GNUNET_MessageHeader))
515 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
518 obm = (const struct OutboundMessage *) message;
519 obmm = (const struct GNUNET_MessageHeader *) &obm[1];
520 msize = size - sizeof (struct OutboundMessage);
521 if (msize < sizeof (struct GNUNET_MessageHeader))
524 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
527 GNUNET_STATISTICS_update (GST_stats,
529 ("# bytes payload received for other peers"), msize,
532 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
533 "Received `%s' request from client with target `%4s' and first message of type %u and total size %u\n",
534 "SEND", GNUNET_i2s (&obm->peer), ntohs (obmm->type), msize);
536 if (GNUNET_NO == GST_neighbours_test_connected (&obm->peer))
538 /* not connected, not allowed to send; can happen due to asynchronous operations */
540 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
541 "Could not send message to peer `%s': not connected\n",
542 GNUNET_i2s (&obm->peer));
544 GNUNET_STATISTICS_update (GST_stats,
546 ("# bytes payload dropped (other peer was not connected)"),
548 GNUNET_SERVER_receive_done (client, GNUNET_OK);
551 GNUNET_SERVER_receive_done (client, GNUNET_OK);
552 stcc = GNUNET_malloc (sizeof (struct SendTransmitContinuationContext));
553 stcc->target = obm->peer;
554 stcc->client = client;
555 GNUNET_SERVER_client_keep (client);
556 GST_neighbours_send (&obm->peer, obmm, msize,
557 GNUNET_TIME_relative_ntoh (obm->timeout),
558 &handle_send_transmit_continuation, stcc);
563 * Try to initiate a connection to the given peer if the blacklist
566 * @param cls closure (unused, NULL)
567 * @param peer identity of peer that was tested
568 * @param result GNUNET_OK if the connection is allowed,
572 try_connect_if_allowed (void *cls, const struct GNUNET_PeerIdentity *peer,
575 if (GNUNET_OK != result)
576 return; /* not allowed */
577 GST_neighbours_try_connect (peer);
582 * Handle request connect message
584 * @param cls closure (always NULL)
585 * @param client identification of the client
586 * @param message the actual message
589 clients_handle_request_connect (void *cls, struct GNUNET_SERVER_Client *client,
590 const struct GNUNET_MessageHeader *message)
592 const struct TransportRequestConnectMessage *trcm =
593 (const struct TransportRequestConnectMessage *) message;
595 GNUNET_STATISTICS_update (GST_stats,
597 ("# REQUEST CONNECT messages received"), 1,
600 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
601 "Received a request connect message for peer `%s'\n",
602 GNUNET_i2s (&trcm->peer));
604 (void) GST_blacklist_test_allowed (&trcm->peer, NULL, &try_connect_if_allowed,
606 GNUNET_SERVER_receive_done (client, GNUNET_OK);
611 * Take the given address and append it to the set of results sent back to
614 * @param cls the transmission context used ('struct GNUNET_SERVER_TransmitContext*')
615 * @param address the resolved name, NULL to indicate the last response
618 transmit_address_to_client (void *cls, const char *buf)
620 struct GNUNET_SERVER_TransmitContext *tc = cls;
624 GNUNET_SERVER_transmit_context_append_data (tc, NULL, 0,
625 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_REPLY);
626 GNUNET_SERVER_transmit_context_run (tc, GNUNET_TIME_UNIT_FOREVER_REL);
629 GNUNET_SERVER_transmit_context_append_data (tc, buf, strlen (buf) + 1,
630 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_REPLY);
635 * Take the given address and append it to the set of results sent back to
638 * @param cls the transmission context used ('struct GNUNET_SERVER_TransmitContext*')
639 * @param address the resolved name, NULL to indicate the last response
642 transmit_binary_to_client (void *cls, void *buf, size_t size)
644 struct GNUNET_SERVER_TransmitContext *tc = cls;
648 GNUNET_SERVER_transmit_context_append_data (tc, NULL, 0,
649 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_REPLY);
650 GNUNET_SERVER_transmit_context_run (tc, GNUNET_TIME_UNIT_FOREVER_REL);
653 GNUNET_SERVER_transmit_context_append_data (tc, buf, size,
654 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_REPLY);
659 * Client asked to resolve an address. Process the request.
662 * @param client the client
663 * @param message the resolution request
666 clients_handle_address_lookup (void *cls, struct GNUNET_SERVER_Client *client,
667 const struct GNUNET_MessageHeader *message)
669 const struct AddressLookupMessage *alum;
670 struct GNUNET_TRANSPORT_PluginFunctions *papi;
671 const char *plugin_name;
673 uint32_t address_len;
675 struct GNUNET_SERVER_TransmitContext *tc;
676 struct GNUNET_TIME_Relative rtimeout;
679 size = ntohs (message->size);
680 if (size < sizeof (struct AddressLookupMessage))
683 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
686 alum = (const struct AddressLookupMessage *) message;
687 address_len = ntohl (alum->addrlen);
688 if (size <= sizeof (struct AddressLookupMessage) + address_len)
691 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
694 address = (const char *) &alum[1];
695 plugin_name = (const char *) &address[address_len];
696 if (plugin_name[size - sizeof (struct AddressLookupMessage) - address_len - 1]
700 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
703 rtimeout = GNUNET_TIME_relative_ntoh (alum->timeout);
704 numeric = ntohl (alum->numeric_only);
705 tc = GNUNET_SERVER_transmit_context_create (client);
706 papi = GST_plugins_find (plugin_name);
709 GNUNET_SERVER_transmit_context_append_data (tc, NULL, 0,
710 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_REPLY);
711 GNUNET_SERVER_transmit_context_run (tc, rtimeout);
714 GNUNET_SERVER_disable_receive_done_warning (client);
715 papi->address_pretty_printer (papi->cls, plugin_name, address, address_len,
716 numeric, rtimeout, &transmit_address_to_client,
722 * Send an address to the client.
724 * @param cls our 'struct GNUNET_SERVER_TransmitContext' (for sending)
725 * @param public_key public key for the peer, never NULL
726 * @param target peer this change is about, never NULL
727 * @param valid_until until what time do we consider the address valid?
728 * @param validation_block is FOREVER if the address is for an unsupported plugin (from PEERINFO)
729 * is ZERO if the address is considered valid (no validation needed)
730 * is a time in the future if we're currently denying re-validation
731 * @param plugin_name name of the plugin
732 * @param plugin_address binary address
733 * @param plugin_address_len length of address
736 send_address_to_client (void *cls,
737 const struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded
738 *public_key, const struct GNUNET_PeerIdentity *target,
739 struct GNUNET_TIME_Absolute valid_until,
740 struct GNUNET_TIME_Absolute validation_block,
741 const char *plugin_name, const void *plugin_address,
742 size_t plugin_address_len)
744 struct GNUNET_SERVER_TransmitContext *tc = cls;
747 /* FIXME: move to a binary format!!! */
748 GNUNET_asprintf (&addr_buf, "%s --- %s, %s",
749 GST_plugins_a2s (plugin_name, plugin_address,
752 GST_neighbours_test_connected (target)) ? "CONNECTED" :
754 (GNUNET_TIME_absolute_get_remaining (valid_until).rel_value >
755 0) ? "VALIDATED" : "UNVALIDATED");
756 transmit_address_to_client (tc, addr_buf);
757 GNUNET_free (addr_buf);
762 * Client asked to obtain information about a peer's addresses.
763 * Process the request.
764 * FIXME: use better name!
767 * @param client the client
768 * @param message the peer address information request
771 clients_handle_peer_address_lookup (void *cls,
772 struct GNUNET_SERVER_Client *client,
773 const struct GNUNET_MessageHeader *message)
775 const struct PeerAddressLookupMessage *peer_address_lookup;
776 struct GNUNET_SERVER_TransmitContext *tc;
778 peer_address_lookup = (const struct PeerAddressLookupMessage *) message;
779 GNUNET_break (ntohl (peer_address_lookup->reserved) == 0);
780 tc = GNUNET_SERVER_transmit_context_create (client);
781 GST_validation_get_addresses (&peer_address_lookup->peer,
782 &send_address_to_client, tc);
783 GNUNET_SERVER_transmit_context_append_data (tc, NULL, 0,
784 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_REPLY);
785 GNUNET_SERVER_transmit_context_run (tc, GNUNET_TIME_UNIT_FOREVER_REL);
790 * Output the active address of connected neighbours to the given client.
792 * @param cls the 'struct GNUNET_SERVER_TransmitContext' for transmission to the client
793 * @param neighbour identity of the neighbour
794 * @param ats performance data
795 * @param ats_count number of entries in ats (excluding 0-termination)
796 * @param transport plugin
797 * @param addr address
798 * @param addrlen address length
801 output_addresses (void *cls, const struct GNUNET_PeerIdentity *peer,
802 const struct GNUNET_ATS_Information *ats,
804 const char * transport,
808 struct GNUNET_SERVER_TransmitContext *tc = cls;
809 struct AddressIterateResponseMessage * msg;
813 (sizeof (struct AddressIterateResponseMessage) + strlen(transport) + 1);
814 msg = GNUNET_malloc (size);
815 memcpy (&msg->peer, peer, sizeof (struct GNUNET_PeerIdentity));
816 memcpy (&msg[0], transport, strlen(transport)+1);
817 msg->addrlen = ntohs (addrlen);
818 msg->pluginlen = ntohs (strlen(transport)+1);
820 transmit_binary_to_client (tc, msg, size);
826 * Client asked to obtain information about all actively used addresses.
827 * Process the request. FIXME: use better name!
830 * @param client the client
831 * @param message the peer address information request
834 clients_handle_address_iterate (void *cls, struct GNUNET_SERVER_Client *client,
835 const struct GNUNET_MessageHeader *message)
837 struct GNUNET_SERVER_TransmitContext *tc;
839 GNUNET_SERVER_disable_receive_done_warning (client);
840 tc = GNUNET_SERVER_transmit_context_create (client);
841 GST_neighbours_iterate (&output_addresses, tc);
842 GNUNET_SERVER_transmit_context_append_data (tc, NULL, 0,
843 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_REPLY);
844 GNUNET_SERVER_transmit_context_run (tc, GNUNET_TIME_UNIT_FOREVER_REL);
849 * Start handling requests from clients.
851 * @param server server used to accept clients from.
854 GST_clients_start (struct GNUNET_SERVER_Handle *server)
856 static const struct GNUNET_SERVER_MessageHandler handlers[] = {
857 {&clients_handle_start, NULL,
858 GNUNET_MESSAGE_TYPE_TRANSPORT_START, sizeof (struct StartMessage)},
859 {&clients_handle_hello, NULL,
860 GNUNET_MESSAGE_TYPE_HELLO, 0},
861 {&clients_handle_send, NULL,
862 GNUNET_MESSAGE_TYPE_TRANSPORT_SEND, 0},
863 {&clients_handle_request_connect, NULL,
864 GNUNET_MESSAGE_TYPE_TRANSPORT_REQUEST_CONNECT,
865 sizeof (struct TransportRequestConnectMessage)},
866 {&clients_handle_address_lookup, NULL,
867 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_LOOKUP, 0},
868 {&clients_handle_peer_address_lookup, NULL,
869 GNUNET_MESSAGE_TYPE_TRANSPORT_PEER_ADDRESS_LOOKUP,
870 sizeof (struct PeerAddressLookupMessage)},
871 {&clients_handle_address_iterate, NULL,
872 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_ITERATE,
873 sizeof (struct AddressIterateMessage)},
874 {&GST_blacklist_handle_init, NULL,
875 GNUNET_MESSAGE_TYPE_TRANSPORT_BLACKLIST_INIT,
876 sizeof (struct GNUNET_MessageHeader)},
877 {&GST_blacklist_handle_reply, NULL,
878 GNUNET_MESSAGE_TYPE_TRANSPORT_BLACKLIST_REPLY,
879 sizeof (struct BlacklistMessage)},
882 GNUNET_SERVER_add_handlers (server, handlers);
883 GNUNET_SERVER_disconnect_notify (server, &client_disconnect_notification,
889 * Stop processing clients.
899 * Broadcast the given message to all of our clients.
901 * @param msg message to broadcast
902 * @param may_drop GNUNET_YES if the message can be dropped / is payload
905 GST_clients_broadcast (const struct GNUNET_MessageHeader *msg, int may_drop)
907 struct TransportClient *tc;
909 for (tc = clients_head; tc != NULL; tc = tc->next)
911 if ( (GNUNET_YES == may_drop) &&
912 (GNUNET_YES != tc->send_payload) )
913 continue; /* skip, this client does not care about payload */
914 unicast (tc, msg, may_drop);
920 * Send the given message to a particular client
922 * @param client target of the message
923 * @param msg message to transmit
924 * @param may_drop GNUNET_YES if the message can be dropped
927 GST_clients_unicast (struct GNUNET_SERVER_Client *client,
928 const struct GNUNET_MessageHeader *msg, int may_drop)
930 struct TransportClient *tc;
932 tc = lookup_client (client);
934 return; /* client got disconnected in the meantime, drop message */
935 unicast (tc, msg, may_drop);
939 /* end of file gnunet-service-transport_clients.c */