2 This file is part of GNUnet.
3 (C) 2010,2011 Christian Grothoff (and other contributing authors)
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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
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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 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_SERVER_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 * Client monitoring changes of active addresses of our neighbours.
122 struct MonitoringClient
125 * This is a doubly-linked list.
127 struct MonitoringClient *next;
130 * This is a doubly-linked list.
132 struct MonitoringClient *prev;
135 * Handle to the client.
137 struct GNUNET_SERVER_Client *client;
140 * Peer identity to monitor the addresses of.
141 * Zero to monitor all neighrours.
143 struct GNUNET_PeerIdentity peer;
149 * Head of linked list of all clients to this service.
151 static struct TransportClient *clients_head;
154 * Tail of linked list of all clients to this service.
156 static struct TransportClient *clients_tail;
159 * Head of linked list of monitoring clients.
161 static struct MonitoringClient *monitoring_clients_head;
164 * Tail of linked list of monitoring clients.
166 static struct MonitoringClient *monitoring_clients_tail;
169 * Notification context, to send updates on changes to active addresses
172 struct GNUNET_SERVER_NotificationContext *nc = NULL;
176 * Find the internal handle associated with the given client handle
178 * @param client server's client handle to look up
179 * @return internal client handle
181 static struct TransportClient *
182 lookup_client (struct GNUNET_SERVER_Client *client)
184 struct TransportClient *tc;
189 if (tc->client == client)
198 * Create the internal handle for the given server client handle
200 * @param client server's client handle to create our internal handle for
201 * @return fresh internal client handle
203 static struct TransportClient *
204 setup_client (struct GNUNET_SERVER_Client *client)
206 struct TransportClient *tc;
208 GNUNET_assert (lookup_client (client) == NULL);
209 tc = GNUNET_malloc (sizeof (struct TransportClient));
213 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Client %p connected\n", tc);
220 * Find the handle to the monitoring client associated with the given
223 * @param client server's client handle to look up
224 * @return handle to the monitoring client
226 static struct MonitoringClient *
227 lookup_monitoring_client (struct GNUNET_SERVER_Client *client)
229 struct MonitoringClient *mc;
231 mc = monitoring_clients_head;
234 if (mc->client == client)
243 * Setup a new monitoring client using the given server client handle and
246 * @param client server's client handle to create our internal handle for
247 * @param peer identity of the peer to monitor the addresses of,
248 * zero to monitor all neighrours.
249 * @return handle to the new monitoring client
251 static struct MonitoringClient *
252 setup_monitoring_client (struct GNUNET_SERVER_Client *client,
253 struct GNUNET_PeerIdentity *peer)
255 struct MonitoringClient *mc;
257 GNUNET_assert (lookup_monitoring_client (client) == NULL);
258 mc = GNUNET_malloc (sizeof (struct MonitoringClient));
261 GNUNET_CONTAINER_DLL_insert (monitoring_clients_head,
262 monitoring_clients_tail,
264 GNUNET_SERVER_notification_context_add (nc, client);
266 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
267 "Client %p started monitoring of the peer `%s'\n",
268 mc, GNUNET_i2s (peer));
274 * Function called to notify a client about the socket being ready to
275 * queue more data. "buf" will be NULL and "size" zero if the socket
276 * was closed for writing in the meantime.
279 * @param size number of bytes available in buf
280 * @param buf where the callee should write the message
281 * @return number of bytes written to buf
284 transmit_to_client_callback (void *cls, size_t size, void *buf)
286 struct TransportClient *tc = cls;
287 struct ClientMessageQueueEntry *q;
288 const struct GNUNET_MessageHeader *msg;
297 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
298 "Transmission to client failed, closing connection.\n");
304 while (NULL != (q = tc->message_queue_head))
306 msg = (const struct GNUNET_MessageHeader *) &q[1];
307 msize = ntohs (msg->size);
308 if (msize + tsize > size)
311 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
312 "Transmitting message of type %u to client %p.\n",
313 ntohs (msg->type), tc);
315 GNUNET_CONTAINER_DLL_remove (tc->message_queue_head, tc->message_queue_tail,
318 memcpy (&cbuf[tsize], msg, msize);
324 GNUNET_assert (msize >= sizeof (struct GNUNET_MessageHeader));
326 GNUNET_SERVER_notify_transmit_ready (tc->client, msize,
327 GNUNET_TIME_UNIT_FOREVER_REL,
328 &transmit_to_client_callback, tc);
329 GNUNET_assert (tc->th != NULL);
336 * Queue the given message for transmission to the given client
338 * @param tc target of the message
339 * @param msg message to transmit
340 * @param may_drop GNUNET_YES if the message can be dropped
343 unicast (struct TransportClient *tc, const struct GNUNET_MessageHeader *msg,
346 struct ClientMessageQueueEntry *q;
349 if ((tc->message_count >= MAX_PENDING) && (GNUNET_YES == may_drop))
351 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
353 ("Dropping message of type %u and size %u, have %u/%u messages pending\n"),
354 ntohs (msg->type), ntohs (msg->size), tc->message_count,
356 GNUNET_STATISTICS_update (GST_stats,
358 ("# messages dropped due to slow client"), 1,
362 msize = ntohs (msg->size);
363 GNUNET_assert (msize >= sizeof (struct GNUNET_MessageHeader));
364 q = GNUNET_malloc (sizeof (struct ClientMessageQueueEntry) + msize);
365 memcpy (&q[1], msg, msize);
366 GNUNET_CONTAINER_DLL_insert_tail (tc->message_queue_head,
367 tc->message_queue_tail, q);
372 GNUNET_SERVER_notify_transmit_ready (tc->client, msize,
373 GNUNET_TIME_UNIT_FOREVER_REL,
374 &transmit_to_client_callback, tc);
375 GNUNET_assert (tc->th != NULL);
380 * Called whenever a client is disconnected. Frees our
381 * resources associated with that client.
384 * @param client identification of the client
387 client_disconnect_notification (void *cls, struct GNUNET_SERVER_Client *client)
389 struct TransportClient *tc;
390 struct MonitoringClient *mc;
391 struct ClientMessageQueueEntry *mqe;
395 mc = lookup_monitoring_client (client);
398 GNUNET_CONTAINER_DLL_remove (monitoring_clients_head,
399 monitoring_clients_tail,
403 tc = lookup_client (client);
407 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
408 "Client %p disconnected, cleaning up.\n", tc);
410 while (NULL != (mqe = tc->message_queue_head))
412 GNUNET_CONTAINER_DLL_remove (tc->message_queue_head, tc->message_queue_tail,
417 GNUNET_CONTAINER_DLL_remove (clients_head, clients_tail, tc);
420 GNUNET_SERVER_notify_transmit_ready_cancel (tc->th);
423 GNUNET_break (0 == tc->message_count);
429 * Function called for each of our connected neighbours. Notify the
430 * client about the existing neighbour.
432 * @param cls the 'struct TransportClient' to notify
433 * @param peer identity of the neighbour
434 * @param ats performance data
435 * @param ats_count number of entries in ats (excluding 0-termination)
436 * @param address the address
439 notify_client_about_neighbour (void *cls,
440 const struct GNUNET_PeerIdentity *peer,
441 const struct GNUNET_ATS_Information *ats,
443 const struct GNUNET_HELLO_Address *address)
445 struct TransportClient *tc = cls;
446 struct ConnectInfoMessage *cim;
447 struct GNUNET_ATS_Information *ap;
449 sizeof (struct ConnectInfoMessage) +
450 ats_count * sizeof (struct GNUNET_ATS_Information);
453 GNUNET_assert (size < GNUNET_SERVER_MAX_MESSAGE_SIZE);
454 cim = (struct ConnectInfoMessage *) buf;
455 cim->header.size = htons (size);
456 cim->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT);
457 cim->ats_count = htonl (ats_count);
459 ap = (struct GNUNET_ATS_Information *) &cim[1];
460 memcpy (ap, ats, ats_count * sizeof (struct GNUNET_ATS_Information));
461 unicast (tc, &cim->header, GNUNET_NO);
466 * Initialize a normal client. We got a start message from this
467 * client, add him to the list of clients for broadcasting of inbound
471 * @param client the client
472 * @param message the start message that was sent
475 clients_handle_start (void *cls, struct GNUNET_SERVER_Client *client,
476 const struct GNUNET_MessageHeader *message)
478 const struct StartMessage *start;
479 struct TransportClient *tc;
482 tc = lookup_client (client);
485 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
486 "Client %p sent START\n", tc);
490 /* got 'start' twice from the same client, not allowed */
492 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
493 "TransportClient %p ServerClient %p sent multiple START messages\n",
497 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
500 start = (const struct StartMessage *) message;
501 options = ntohl (start->options);
502 if ((0 != (1 & options)) &&
504 memcmp (&start->self, &GST_my_identity,
505 sizeof (struct GNUNET_PeerIdentity))))
507 /* client thinks this is a different peer, reject */
508 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
510 ("Rejecting control connection from peer `%s', which is not me!\n"),
511 GNUNET_i2s (&start->self));
512 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
515 tc = setup_client (client);
516 tc->send_payload = (0 != (2 & options));
517 unicast (tc, GST_hello_get (), GNUNET_NO);
518 GST_neighbours_iterate (¬ify_client_about_neighbour, tc);
519 GNUNET_CONTAINER_DLL_insert (clients_head, clients_tail, tc);
520 GNUNET_SERVER_receive_done (client, GNUNET_OK);
525 * Client sent us a HELLO. Process the request.
528 * @param client the client
529 * @param message the HELLO message
532 clients_handle_hello (void *cls, struct GNUNET_SERVER_Client *client,
533 const struct GNUNET_MessageHeader *message)
535 GST_validation_handle_hello (message);
536 GNUNET_SERVER_receive_done (client, GNUNET_OK);
541 * Closure for 'handle_send_transmit_continuation'
543 struct SendTransmitContinuationContext
546 * Client that made the request.
548 struct GNUNET_SERVER_Client *client;
551 * Peer that was the target.
553 struct GNUNET_PeerIdentity target;
558 * Function called after the transmission is done. Notify the client that it is
559 * OK to send the next message.
562 * @param success GNUNET_OK on success, GNUNET_NO on failure, GNUNET_SYSERR if we're not connected
565 handle_send_transmit_continuation (void *cls, int success)
567 struct SendTransmitContinuationContext *stcc = cls;
568 struct SendOkMessage send_ok_msg;
570 send_ok_msg.header.size = htons (sizeof (send_ok_msg));
571 send_ok_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SEND_OK);
572 send_ok_msg.success = htonl (success);
573 send_ok_msg.latency =
574 GNUNET_TIME_relative_hton (GNUNET_TIME_UNIT_FOREVER_REL);
575 send_ok_msg.peer = stcc->target;
576 GST_clients_unicast (stcc->client, &send_ok_msg.header, GNUNET_NO);
577 GNUNET_SERVER_client_drop (stcc->client);
583 * Client asked for transmission to a peer. Process the request.
586 * @param client the client
587 * @param message the send message that was sent
590 clients_handle_send (void *cls, struct GNUNET_SERVER_Client *client,
591 const struct GNUNET_MessageHeader *message)
593 const struct OutboundMessage *obm;
594 const struct GNUNET_MessageHeader *obmm;
595 struct SendTransmitContinuationContext *stcc;
598 struct TransportClient *tc;
600 tc = lookup_client (client);
603 /* client asked for transmission before 'START' */
605 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
609 size = ntohs (message->size);
611 sizeof (struct OutboundMessage) + sizeof (struct GNUNET_MessageHeader))
614 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
617 obm = (const struct OutboundMessage *) message;
618 obmm = (const struct GNUNET_MessageHeader *) &obm[1];
619 msize = size - sizeof (struct OutboundMessage);
620 if (msize < sizeof (struct GNUNET_MessageHeader))
623 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
626 GNUNET_STATISTICS_update (GST_stats,
628 ("# bytes payload received for other peers"), msize,
631 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
632 "Received `%s' request from client with target `%4s' and first message of type %u and total size %u\n",
633 "SEND", GNUNET_i2s (&obm->peer), ntohs (obmm->type), msize);
635 if (GNUNET_NO == GST_neighbours_test_connected (&obm->peer))
637 /* not connected, not allowed to send; can happen due to asynchronous operations */
639 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
640 "Could not send message to peer `%s': not connected\n",
641 GNUNET_i2s (&obm->peer));
643 GNUNET_STATISTICS_update (GST_stats,
645 ("# bytes payload dropped (other peer was not connected)"),
647 GNUNET_SERVER_receive_done (client, GNUNET_OK);
650 GNUNET_SERVER_receive_done (client, GNUNET_OK);
651 stcc = GNUNET_malloc (sizeof (struct SendTransmitContinuationContext));
652 stcc->target = obm->peer;
653 stcc->client = client;
654 GNUNET_SERVER_client_keep (client);
655 GST_neighbours_send (&obm->peer, obmm, msize,
656 GNUNET_TIME_relative_ntoh (obm->timeout),
657 &handle_send_transmit_continuation, stcc);
662 * Try to initiate a connection to the given peer if the blacklist
665 * @param cls closure (unused, NULL)
666 * @param peer identity of peer that was tested
667 * @param result GNUNET_OK if the connection is allowed,
671 try_connect_if_allowed (void *cls, const struct GNUNET_PeerIdentity *peer,
674 if (GNUNET_OK != result)
675 return; /* not allowed */
676 GST_neighbours_try_connect (peer);
681 * Handle request connect message
683 * @param cls closure (always NULL)
684 * @param client identification of the client
685 * @param message the actual message
688 clients_handle_request_connect (void *cls, struct GNUNET_SERVER_Client *client,
689 const struct GNUNET_MessageHeader *message)
691 const struct TransportRequestConnectMessage *trcm =
692 (const struct TransportRequestConnectMessage *) message;
694 GNUNET_STATISTICS_update (GST_stats,
696 ("# REQUEST CONNECT messages received"), 1,
699 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
700 "Received a request connect message for peer `%s'\n",
701 GNUNET_i2s (&trcm->peer));
703 (void) GST_blacklist_test_allowed (&trcm->peer, NULL, &try_connect_if_allowed,
705 GNUNET_SERVER_receive_done (client, GNUNET_OK);
710 * Take the given address and append it to the set of results sent back to
713 * @param cls the transmission context used ('struct GNUNET_SERVER_TransmitContext*')
714 * @param buf text to transmit
717 transmit_address_to_client (void *cls, const char *buf)
719 struct GNUNET_SERVER_TransmitContext *tc = cls;
723 GNUNET_SERVER_transmit_context_append_data (tc, NULL, 0,
724 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_TO_STRING_REPLY);
725 GNUNET_SERVER_transmit_context_run (tc, GNUNET_TIME_UNIT_FOREVER_REL);
728 GNUNET_SERVER_transmit_context_append_data (tc, buf, strlen (buf) + 1,
729 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_TO_STRING_REPLY);
734 * Client asked to resolve an address. Process the request.
737 * @param client the client
738 * @param message the resolution request
741 clients_handle_address_to_string (void *cls,
742 struct GNUNET_SERVER_Client *client,
743 const struct GNUNET_MessageHeader *message)
745 const struct AddressLookupMessage *alum;
746 struct GNUNET_TRANSPORT_PluginFunctions *papi;
747 const char *plugin_name;
749 uint32_t address_len;
751 struct GNUNET_SERVER_TransmitContext *tc;
752 struct GNUNET_TIME_Relative rtimeout;
755 size = ntohs (message->size);
756 if (size < sizeof (struct AddressLookupMessage))
759 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
762 alum = (const struct AddressLookupMessage *) message;
763 address_len = ntohs (alum->addrlen);
764 if (size <= sizeof (struct AddressLookupMessage) + address_len)
767 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
770 address = (const char *) &alum[1];
771 plugin_name = (const char *) &address[address_len];
772 if (plugin_name[size - sizeof (struct AddressLookupMessage) - address_len - 1]
776 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
779 rtimeout = GNUNET_TIME_relative_ntoh (alum->timeout);
780 numeric = ntohs (alum->numeric_only);
781 tc = GNUNET_SERVER_transmit_context_create (client);
782 papi = GST_plugins_find (plugin_name);
785 GNUNET_SERVER_transmit_context_append_data (tc, NULL, 0,
786 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_TO_STRING_REPLY);
787 GNUNET_SERVER_transmit_context_run (tc, rtimeout);
790 GNUNET_SERVER_disable_receive_done_warning (client);
791 if ((NULL == address) || (0 == address_len))
795 papi->address_pretty_printer (papi->cls, plugin_name, address, address_len,
796 numeric, rtimeout, &transmit_address_to_client,
802 * Compose AddressIterateResponseMessage using the given peer and address.
804 * @param peer identity of the peer
805 * @param address the address, NULL on disconnect
806 * @return composed message
808 static struct AddressIterateResponseMessage *
809 compose_address_iterate_response_message (const struct GNUNET_PeerIdentity
811 const struct GNUNET_HELLO_Address
814 struct AddressIterateResponseMessage *msg;
820 GNUNET_assert (NULL != peer);
823 tlen = strlen (address->transport_name) + 1;
824 alen = address->address_length;
828 size = (sizeof (struct AddressIterateResponseMessage) + alen + tlen);
829 msg = GNUNET_malloc (size);
830 msg->header.size = htons (size);
832 htons (GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_ITERATE_RESPONSE);
833 msg->reserved = htonl (0);
835 msg->addrlen = htonl (alen);
836 msg->pluginlen = htonl (tlen);
839 addr = (char *) &msg[1];
840 memcpy (addr, address->address, alen);
841 memcpy (&addr[alen], address->transport_name, tlen);
848 * Output the active address of connected neighbours to the given client.
850 * @param cls the 'struct GNUNET_SERVER_TransmitContext' for transmission to the client
851 * @param peer identity of the neighbour
852 * @param ats performance data
853 * @param ats_count number of entries in ats (excluding 0-termination)
854 * @param address the address
857 output_address (void *cls, const struct GNUNET_PeerIdentity *peer,
858 const struct GNUNET_ATS_Information *ats, uint32_t ats_count,
859 const struct GNUNET_HELLO_Address *address)
861 struct GNUNET_SERVER_TransmitContext *tc = cls;
862 struct AddressIterateResponseMessage *msg;
864 msg = compose_address_iterate_response_message (peer, address);
865 GNUNET_SERVER_transmit_context_append_message (tc, &msg->header);
871 * Client asked to obtain information about all actively used addresses
873 * Process the request.
876 * @param client the client
877 * @param message the peer address information request
880 clients_handle_address_iterate (void *cls, struct GNUNET_SERVER_Client *client,
881 const struct GNUNET_MessageHeader *message)
883 static struct GNUNET_PeerIdentity all_zeros;
884 struct GNUNET_SERVER_TransmitContext *tc;
885 struct AddressIterateMessage *msg;
886 struct GNUNET_HELLO_Address *address;
888 if (ntohs (message->type) != GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_ITERATE)
891 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
894 if (ntohs (message->size) != sizeof (struct AddressIterateMessage))
897 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
900 msg = (struct AddressIterateMessage *) message;
901 if ( (GNUNET_YES != ntohl (msg->one_shot)) &&
902 (NULL != lookup_monitoring_client (client)) )
904 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
905 "ServerClient %p tried to start monitoring twice\n",
908 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
911 GNUNET_SERVER_disable_receive_done_warning (client);
912 tc = GNUNET_SERVER_transmit_context_create (client);
913 if (0 == memcmp (&msg->peer, &all_zeros, sizeof (struct GNUNET_PeerIdentity)))
915 /* iterate over all neighbours */
916 GST_neighbours_iterate (&output_address, tc);
920 /* just return one neighbour */
921 address = GST_neighbour_get_current_address (&msg->peer);
923 output_address (tc, &msg->peer, NULL, 0, address);
925 if (GNUNET_YES != ntohl (msg->one_shot))
926 setup_monitoring_client (client, &msg->peer);
928 GNUNET_SERVER_transmit_context_append_data (tc, NULL, 0,
929 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_ITERATE_RESPONSE);
930 GNUNET_SERVER_transmit_context_run (tc, GNUNET_TIME_UNIT_FOREVER_REL);
935 * Start handling requests from clients.
937 * @param server server used to accept clients from.
940 GST_clients_start (struct GNUNET_SERVER_Handle *server)
942 static const struct GNUNET_SERVER_MessageHandler handlers[] = {
943 {&clients_handle_start, NULL,
944 GNUNET_MESSAGE_TYPE_TRANSPORT_START, sizeof (struct StartMessage)},
945 {&clients_handle_hello, NULL,
946 GNUNET_MESSAGE_TYPE_HELLO, 0},
947 {&clients_handle_send, NULL,
948 GNUNET_MESSAGE_TYPE_TRANSPORT_SEND, 0},
949 {&clients_handle_request_connect, NULL,
950 GNUNET_MESSAGE_TYPE_TRANSPORT_REQUEST_CONNECT,
951 sizeof (struct TransportRequestConnectMessage)},
952 {&clients_handle_address_to_string, NULL,
953 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_TO_STRING, 0},
954 {&clients_handle_address_iterate, NULL,
955 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_ITERATE,
956 sizeof (struct AddressIterateMessage)},
957 {&GST_blacklist_handle_init, NULL,
958 GNUNET_MESSAGE_TYPE_TRANSPORT_BLACKLIST_INIT,
959 sizeof (struct GNUNET_MessageHeader)},
960 {&GST_blacklist_handle_reply, NULL,
961 GNUNET_MESSAGE_TYPE_TRANSPORT_BLACKLIST_REPLY,
962 sizeof (struct BlacklistMessage)},
965 nc = GNUNET_SERVER_notification_context_create (server, 0);
966 GNUNET_SERVER_add_handlers (server, handlers);
967 GNUNET_SERVER_disconnect_notify (server, &client_disconnect_notification,
973 * Stop processing clients.
980 GNUNET_SERVER_notification_context_destroy (nc);
987 * Broadcast the given message to all of our clients.
989 * @param msg message to broadcast
990 * @param may_drop GNUNET_YES if the message can be dropped / is payload
993 GST_clients_broadcast (const struct GNUNET_MessageHeader *msg, int may_drop)
995 struct TransportClient *tc;
997 for (tc = clients_head; tc != NULL; tc = tc->next)
999 if ((GNUNET_YES == may_drop) && (GNUNET_YES != tc->send_payload))
1000 continue; /* skip, this client does not care about payload */
1001 unicast (tc, msg, may_drop);
1007 * Send the given message to a particular client
1009 * @param client target of the message
1010 * @param msg message to transmit
1011 * @param may_drop GNUNET_YES if the message can be dropped
1014 GST_clients_unicast (struct GNUNET_SERVER_Client *client,
1015 const struct GNUNET_MessageHeader *msg, int may_drop)
1017 struct TransportClient *tc;
1019 tc = lookup_client (client);
1021 return; /* client got disconnected in the meantime, drop message */
1022 unicast (tc, msg, may_drop);
1027 * Broadcast the new active address to all clients monitoring the peer.
1029 * @param peer peer this update is about (never NULL)
1030 * @param address address, NULL on disconnect
1033 GST_clients_broadcast_address_notification (const struct GNUNET_PeerIdentity
1035 const struct GNUNET_HELLO_Address
1038 struct AddressIterateResponseMessage *msg;
1039 struct MonitoringClient *mc;
1040 static struct GNUNET_PeerIdentity all_zeros;
1042 msg = compose_address_iterate_response_message (peer, address);
1043 mc = monitoring_clients_head;
1046 if ((0 == memcmp (&mc->peer, &all_zeros,
1047 sizeof (struct GNUNET_PeerIdentity))) ||
1048 (0 == memcmp (&mc->peer, peer,
1049 sizeof (struct GNUNET_PeerIdentity))))
1051 GNUNET_SERVER_notification_context_unicast (nc, mc->client,
1052 &msg->header, GNUNET_NO);
1061 /* end of file gnunet-service-transport_clients.c */