2 This file is part of GNUnet.
3 (C) 2010,2011 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
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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));
211 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Client %p connected\n", tc);
217 * Find the handle to the monitoring client associated with the given
220 * @param client server's client handle to look up
221 * @return handle to the monitoring client
223 static struct MonitoringClient *
224 lookup_monitoring_client (struct GNUNET_SERVER_Client *client)
226 struct MonitoringClient *mc;
228 mc = monitoring_clients_head;
231 if (mc->client == client)
240 * Setup a new monitoring client using the given server client handle and
243 * @param client server's client handle to create our internal handle for
244 * @param peer identity of the peer to monitor the addresses of,
245 * zero to monitor all neighrours.
246 * @return handle to the new monitoring client
248 static struct MonitoringClient *
249 setup_monitoring_client (struct GNUNET_SERVER_Client *client,
250 struct GNUNET_PeerIdentity *peer)
252 struct MonitoringClient *mc;
254 GNUNET_assert (lookup_monitoring_client (client) == NULL);
255 mc = GNUNET_malloc (sizeof (struct MonitoringClient));
258 GNUNET_CONTAINER_DLL_insert (monitoring_clients_head,
259 monitoring_clients_tail,
261 GNUNET_SERVER_notification_context_add (nc, client);
263 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
264 "Client %p started monitoring of the peer `%s'\n",
265 mc, GNUNET_i2s (peer));
271 * Function called to notify a client about the socket being ready to
272 * queue more data. "buf" will be NULL and "size" zero if the socket
273 * was closed for writing in the meantime.
276 * @param size number of bytes available in buf
277 * @param buf where the callee should write the message
278 * @return number of bytes written to buf
281 transmit_to_client_callback (void *cls, size_t size, void *buf)
283 struct TransportClient *tc = cls;
284 struct ClientMessageQueueEntry *q;
285 const struct GNUNET_MessageHeader *msg;
293 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
294 "Transmission to client failed, closing connection.\n");
299 while (NULL != (q = tc->message_queue_head))
301 msg = (const struct GNUNET_MessageHeader *) &q[1];
302 msize = ntohs (msg->size);
303 if (msize + tsize > size)
305 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
306 "Transmitting message of type %u to client %p.\n",
307 ntohs (msg->type), tc);
308 GNUNET_CONTAINER_DLL_remove (tc->message_queue_head, tc->message_queue_tail,
311 memcpy (&cbuf[tsize], msg, msize);
317 GNUNET_assert (msize >= sizeof (struct GNUNET_MessageHeader));
319 GNUNET_SERVER_notify_transmit_ready (tc->client, msize,
320 GNUNET_TIME_UNIT_FOREVER_REL,
321 &transmit_to_client_callback, tc);
322 GNUNET_assert (tc->th != NULL);
329 * Queue the given message for transmission to the given client
331 * @param tc target of the message
332 * @param msg message to transmit
333 * @param may_drop GNUNET_YES if the message can be dropped
336 unicast (struct TransportClient *tc, const struct GNUNET_MessageHeader *msg,
339 struct ClientMessageQueueEntry *q;
348 if ((tc->message_count >= MAX_PENDING) && (GNUNET_YES == may_drop))
350 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
352 ("Dropping message of type %u and size %u, have %u/%u messages pending\n"),
353 ntohs (msg->type), ntohs (msg->size), tc->message_count,
355 GNUNET_STATISTICS_update (GST_stats,
357 ("# messages dropped due to slow client"), 1,
361 msize = ntohs (msg->size);
362 GNUNET_assert (msize >= sizeof (struct GNUNET_MessageHeader));
363 q = GNUNET_malloc (sizeof (struct ClientMessageQueueEntry) + msize);
364 memcpy (&q[1], msg, msize);
365 GNUNET_CONTAINER_DLL_insert_tail (tc->message_queue_head,
366 tc->message_queue_tail, q);
371 GNUNET_SERVER_notify_transmit_ready (tc->client, msize,
372 GNUNET_TIME_UNIT_FOREVER_REL,
373 &transmit_to_client_callback, tc);
374 GNUNET_assert (tc->th != NULL);
379 * Called whenever a client is disconnected. Frees our
380 * resources associated with that client.
383 * @param client identification of the client
386 client_disconnect_notification (void *cls, struct GNUNET_SERVER_Client *client)
388 struct TransportClient *tc;
389 struct MonitoringClient *mc;
390 struct ClientMessageQueueEntry *mqe;
394 mc = lookup_monitoring_client (client);
397 GNUNET_CONTAINER_DLL_remove (monitoring_clients_head,
398 monitoring_clients_tail,
402 tc = lookup_client (client);
405 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
406 "Client %p disconnected, cleaning up.\n", tc);
407 while (NULL != (mqe = tc->message_queue_head))
409 GNUNET_CONTAINER_DLL_remove (tc->message_queue_head, tc->message_queue_tail,
414 GNUNET_CONTAINER_DLL_remove (clients_head, clients_tail, tc);
417 GNUNET_SERVER_notify_transmit_ready_cancel (tc->th);
420 GNUNET_break (0 == tc->message_count);
426 * Function called for each of our connected neighbours. Notify the
427 * client about the existing neighbour.
429 * @param cls the 'struct TransportClient' to notify
430 * @param peer identity of the neighbour
431 * @param ats performance data
432 * @param ats_count number of entries in ats (excluding 0-termination)
433 * @param address the address
436 notify_client_about_neighbour (void *cls,
437 const struct GNUNET_PeerIdentity *peer,
438 const struct GNUNET_ATS_Information *ats,
440 const struct GNUNET_HELLO_Address *address)
442 struct TransportClient *tc = cls;
443 struct ConnectInfoMessage *cim;
444 struct GNUNET_ATS_Information *ap;
446 sizeof (struct ConnectInfoMessage) +
447 ats_count * sizeof (struct GNUNET_ATS_Information);
448 char buf[size] GNUNET_ALIGN;
450 GNUNET_assert (size < GNUNET_SERVER_MAX_MESSAGE_SIZE);
451 cim = (struct ConnectInfoMessage *) buf;
452 cim->header.size = htons (size);
453 cim->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT);
454 cim->ats_count = htonl (ats_count);
456 ap = (struct GNUNET_ATS_Information *) &cim[1];
457 memcpy (ap, ats, ats_count * sizeof (struct GNUNET_ATS_Information));
458 unicast (tc, &cim->header, GNUNET_NO);
463 * Initialize a normal client. We got a start message from this
464 * client, add him to the list of clients for broadcasting of inbound
468 * @param client the client
469 * @param message the start message that was sent
472 clients_handle_start (void *cls, struct GNUNET_SERVER_Client *client,
473 const struct GNUNET_MessageHeader *message)
475 const struct StartMessage *start;
476 struct TransportClient *tc;
479 tc = lookup_client (client);
481 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
482 "Client %p sent START\n", tc);
485 /* got 'start' twice from the same client, not allowed */
486 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
487 "TransportClient %p ServerClient %p sent multiple START messages\n",
490 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
493 start = (const struct StartMessage *) message;
494 options = ntohl (start->options);
495 if ((0 != (1 & options)) &&
497 memcmp (&start->self, &GST_my_identity,
498 sizeof (struct GNUNET_PeerIdentity))))
500 /* client thinks this is a different peer, reject */
501 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
503 ("Rejecting control connection from peer `%s', which is not me!\n"),
504 GNUNET_i2s (&start->self));
505 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
508 tc = setup_client (client);
509 tc->send_payload = (0 != (2 & options));
510 unicast (tc, GST_hello_get (), GNUNET_NO);
511 GST_neighbours_iterate (¬ify_client_about_neighbour, tc);
512 GNUNET_CONTAINER_DLL_insert (clients_head, clients_tail, tc);
513 GNUNET_SERVER_receive_done (client, GNUNET_OK);
518 * Client sent us a HELLO. Process the request.
521 * @param client the client
522 * @param message the HELLO message
525 clients_handle_hello (void *cls, struct GNUNET_SERVER_Client *client,
526 const struct GNUNET_MessageHeader *message)
528 GST_validation_handle_hello (message);
529 GNUNET_SERVER_receive_done (client, GNUNET_OK);
534 * Closure for 'handle_send_transmit_continuation'
536 struct SendTransmitContinuationContext
539 * Client that made the request.
541 struct GNUNET_SERVER_Client *client;
544 * Peer that was the target.
546 struct GNUNET_PeerIdentity target;
551 * Function called after the transmission is done. Notify the client that it is
552 * OK to send the next message.
555 * @param success GNUNET_OK on success, GNUNET_NO on failure, GNUNET_SYSERR if we're not connected
558 handle_send_transmit_continuation (void *cls, int success)
560 struct SendTransmitContinuationContext *stcc = cls;
561 struct SendOkMessage send_ok_msg;
563 send_ok_msg.header.size = htons (sizeof (send_ok_msg));
564 send_ok_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SEND_OK);
565 send_ok_msg.success = htonl (success);
566 send_ok_msg.latency =
567 GNUNET_TIME_relative_hton (GNUNET_TIME_UNIT_FOREVER_REL);
568 send_ok_msg.peer = stcc->target;
569 GST_clients_unicast (stcc->client, &send_ok_msg.header, GNUNET_NO);
570 GNUNET_SERVER_client_drop (stcc->client);
576 * Client asked for transmission to a peer. Process the request.
579 * @param client the client
580 * @param message the send message that was sent
583 clients_handle_send (void *cls, struct GNUNET_SERVER_Client *client,
584 const struct GNUNET_MessageHeader *message)
586 const struct OutboundMessage *obm;
587 const struct GNUNET_MessageHeader *obmm;
588 struct SendTransmitContinuationContext *stcc;
591 struct TransportClient *tc;
593 tc = lookup_client (client);
596 /* client asked for transmission before 'START' */
598 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
602 size = ntohs (message->size);
604 sizeof (struct OutboundMessage) + sizeof (struct GNUNET_MessageHeader))
607 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
610 obm = (const struct OutboundMessage *) message;
611 obmm = (const struct GNUNET_MessageHeader *) &obm[1];
612 msize = size - sizeof (struct OutboundMessage);
613 if (msize < sizeof (struct GNUNET_MessageHeader))
616 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
620 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
621 "Received `%s' request from client with target `%4s' and first message of type %u and total size %u\n",
622 "SEND", GNUNET_i2s (&obm->peer), ntohs (obmm->type), msize);
623 if (GNUNET_NO == GST_neighbours_test_connected (&obm->peer))
625 /* not connected, not allowed to send; can happen due to asynchronous operations */
626 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
627 "Could not send message to peer `%s': not connected\n",
628 GNUNET_i2s (&obm->peer));
629 GNUNET_STATISTICS_update (GST_stats,
631 ("# bytes payload dropped (other peer was not connected)"),
633 GNUNET_SERVER_receive_done (client, GNUNET_OK);
636 GNUNET_SERVER_receive_done (client, GNUNET_OK);
637 stcc = GNUNET_malloc (sizeof (struct SendTransmitContinuationContext));
638 stcc->target = obm->peer;
639 stcc->client = client;
640 GNUNET_SERVER_client_keep (client);
641 GST_neighbours_send (&obm->peer, obmm, msize,
642 GNUNET_TIME_relative_ntoh (obm->timeout),
643 &handle_send_transmit_continuation, stcc);
648 * Try to initiate a connection to the given peer if the blacklist
651 * @param cls closure (unused, NULL)
652 * @param peer identity of peer that was tested
653 * @param result GNUNET_OK if the connection is allowed,
657 try_connect_if_allowed (void *cls, const struct GNUNET_PeerIdentity *peer,
660 if (GNUNET_OK != result)
661 return; /* not allowed */
662 GST_neighbours_try_connect (peer);
667 * Handle request connect message
669 * @param cls closure (always NULL)
670 * @param client identification of the client
671 * @param message the actual message
674 clients_handle_request_connect (void *cls, struct GNUNET_SERVER_Client *client,
675 const struct GNUNET_MessageHeader *message)
677 const struct TransportRequestConnectMessage *trcm =
678 (const struct TransportRequestConnectMessage *) message;
680 GNUNET_STATISTICS_update (GST_stats,
682 ("# REQUEST CONNECT messages received"), 1,
684 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
685 "Received a request connect message for peer `%s'\n",
686 GNUNET_i2s (&trcm->peer));
687 (void) GST_blacklist_test_allowed (&trcm->peer, NULL, &try_connect_if_allowed,
689 GNUNET_SERVER_receive_done (client, GNUNET_OK);
694 * Take the given address and append it to the set of results sent back to
697 * @param cls the transmission context used ('struct GNUNET_SERVER_TransmitContext*')
698 * @param buf text to transmit
701 transmit_address_to_client (void *cls, const char *buf)
703 struct GNUNET_SERVER_TransmitContext *tc = cls;
707 GNUNET_SERVER_transmit_context_append_data (tc, NULL, 0,
708 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_TO_STRING_REPLY);
709 GNUNET_SERVER_transmit_context_run (tc, GNUNET_TIME_UNIT_FOREVER_REL);
712 GNUNET_SERVER_transmit_context_append_data (tc, buf, strlen (buf) + 1,
713 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_TO_STRING_REPLY);
718 * Client asked to resolve an address. Process the request.
721 * @param client the client
722 * @param message the resolution request
725 clients_handle_address_to_string (void *cls,
726 struct GNUNET_SERVER_Client *client,
727 const struct GNUNET_MessageHeader *message)
729 const struct AddressLookupMessage *alum;
730 struct GNUNET_TRANSPORT_PluginFunctions *papi;
731 const char *plugin_name;
733 uint32_t address_len;
735 struct GNUNET_SERVER_TransmitContext *tc;
736 struct GNUNET_TIME_Relative rtimeout;
739 size = ntohs (message->size);
740 if (size < sizeof (struct AddressLookupMessage))
743 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
746 alum = (const struct AddressLookupMessage *) message;
747 address_len = ntohs (alum->addrlen);
748 if (size <= sizeof (struct AddressLookupMessage) + address_len)
751 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
754 address = (const char *) &alum[1];
755 plugin_name = (const char *) &address[address_len];
756 if (plugin_name[size - sizeof (struct AddressLookupMessage) - address_len - 1]
760 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
763 rtimeout = GNUNET_TIME_relative_ntoh (alum->timeout);
764 numeric = ntohs (alum->numeric_only);
765 tc = GNUNET_SERVER_transmit_context_create (client);
766 papi = GST_plugins_find (plugin_name);
769 GNUNET_SERVER_transmit_context_append_data (tc, NULL, 0,
770 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_TO_STRING_REPLY);
771 GNUNET_SERVER_transmit_context_run (tc, rtimeout);
774 GNUNET_SERVER_disable_receive_done_warning (client);
775 papi->address_pretty_printer (papi->cls, plugin_name, address, address_len,
776 numeric, rtimeout, &transmit_address_to_client,
782 * Compose AddressIterateResponseMessage using the given peer and address.
784 * @param peer identity of the peer
785 * @param address the address, NULL on disconnect
786 * @return composed message
788 static struct AddressIterateResponseMessage *
789 compose_address_iterate_response_message (const struct GNUNET_PeerIdentity
791 const struct GNUNET_HELLO_Address
794 struct AddressIterateResponseMessage *msg;
800 GNUNET_assert (NULL != peer);
803 tlen = strlen (address->transport_name) + 1;
804 alen = address->address_length;
808 size = (sizeof (struct AddressIterateResponseMessage) + alen + tlen);
809 msg = GNUNET_malloc (size);
810 msg->header.size = htons (size);
812 htons (GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_ITERATE_RESPONSE);
813 msg->reserved = htonl (0);
815 msg->addrlen = htonl (alen);
816 msg->pluginlen = htonl (tlen);
819 addr = (char *) &msg[1];
820 memcpy (addr, address->address, alen);
821 memcpy (&addr[alen], address->transport_name, tlen);
828 * Output the active address of connected neighbours to the given client.
830 * @param cls the 'struct GNUNET_SERVER_TransmitContext' for transmission to the client
831 * @param peer identity of the neighbour
832 * @param ats performance data
833 * @param ats_count number of entries in ats (excluding 0-termination)
834 * @param address the address
837 output_address (void *cls, const struct GNUNET_PeerIdentity *peer,
838 const struct GNUNET_ATS_Information *ats, uint32_t ats_count,
839 const struct GNUNET_HELLO_Address *address)
841 struct GNUNET_SERVER_TransmitContext *tc = cls;
842 struct AddressIterateResponseMessage *msg;
844 msg = compose_address_iterate_response_message (peer, address);
845 GNUNET_SERVER_transmit_context_append_message (tc, &msg->header);
851 * Client asked to obtain information about all actively used addresses
853 * Process the request.
856 * @param client the client
857 * @param message the peer address information request
860 clients_handle_address_iterate (void *cls, struct GNUNET_SERVER_Client *client,
861 const struct GNUNET_MessageHeader *message)
863 static struct GNUNET_PeerIdentity all_zeros;
864 struct GNUNET_SERVER_TransmitContext *tc;
865 struct AddressIterateMessage *msg;
866 struct GNUNET_HELLO_Address *address;
868 if (ntohs (message->type) != GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_ITERATE)
871 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
874 if (ntohs (message->size) != sizeof (struct AddressIterateMessage))
877 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
880 msg = (struct AddressIterateMessage *) message;
881 if ( (GNUNET_YES != ntohl (msg->one_shot)) &&
882 (NULL != lookup_monitoring_client (client)) )
884 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
885 "ServerClient %p tried to start monitoring twice\n",
888 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
891 GNUNET_SERVER_disable_receive_done_warning (client);
892 tc = GNUNET_SERVER_transmit_context_create (client);
893 if (0 == memcmp (&msg->peer, &all_zeros, sizeof (struct GNUNET_PeerIdentity)))
895 /* iterate over all neighbours */
896 GST_neighbours_iterate (&output_address, tc);
900 /* just return one neighbour */
901 address = GST_neighbour_get_current_address (&msg->peer);
903 output_address (tc, &msg->peer, NULL, 0, address);
905 if (GNUNET_YES != ntohl (msg->one_shot))
906 setup_monitoring_client (client, &msg->peer);
908 GNUNET_SERVER_transmit_context_append_data (tc, NULL, 0,
909 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_ITERATE_RESPONSE);
910 GNUNET_SERVER_transmit_context_run (tc, GNUNET_TIME_UNIT_FOREVER_REL);
915 * Start handling requests from clients.
917 * @param server server used to accept clients from.
920 GST_clients_start (struct GNUNET_SERVER_Handle *server)
922 static const struct GNUNET_SERVER_MessageHandler handlers[] = {
923 {&clients_handle_start, NULL,
924 GNUNET_MESSAGE_TYPE_TRANSPORT_START, sizeof (struct StartMessage)},
925 {&clients_handle_hello, NULL,
926 GNUNET_MESSAGE_TYPE_HELLO, 0},
927 {&clients_handle_send, NULL,
928 GNUNET_MESSAGE_TYPE_TRANSPORT_SEND, 0},
929 {&clients_handle_request_connect, NULL,
930 GNUNET_MESSAGE_TYPE_TRANSPORT_REQUEST_CONNECT,
931 sizeof (struct TransportRequestConnectMessage)},
932 {&clients_handle_address_to_string, NULL,
933 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_TO_STRING, 0},
934 {&clients_handle_address_iterate, NULL,
935 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_ITERATE,
936 sizeof (struct AddressIterateMessage)},
937 {&GST_blacklist_handle_init, NULL,
938 GNUNET_MESSAGE_TYPE_TRANSPORT_BLACKLIST_INIT,
939 sizeof (struct GNUNET_MessageHeader)},
940 {&GST_blacklist_handle_reply, NULL,
941 GNUNET_MESSAGE_TYPE_TRANSPORT_BLACKLIST_REPLY,
942 sizeof (struct BlacklistMessage)},
945 nc = GNUNET_SERVER_notification_context_create (server, 0);
946 GNUNET_SERVER_add_handlers (server, handlers);
947 GNUNET_SERVER_disconnect_notify (server, &client_disconnect_notification,
953 * Stop processing clients.
960 GNUNET_SERVER_notification_context_destroy (nc);
967 * Broadcast the given message to all of our clients.
969 * @param msg message to broadcast
970 * @param may_drop GNUNET_YES if the message can be dropped / is payload
973 GST_clients_broadcast (const struct GNUNET_MessageHeader *msg, int may_drop)
975 struct TransportClient *tc;
977 for (tc = clients_head; tc != NULL; tc = tc->next)
979 if ((GNUNET_YES == may_drop) && (GNUNET_YES != tc->send_payload))
980 continue; /* skip, this client does not care about payload */
981 unicast (tc, msg, may_drop);
987 * Send the given message to a particular client
989 * @param client target of the message
990 * @param msg message to transmit
991 * @param may_drop GNUNET_YES if the message can be dropped
994 GST_clients_unicast (struct GNUNET_SERVER_Client *client,
995 const struct GNUNET_MessageHeader *msg, int may_drop)
997 struct TransportClient *tc;
999 tc = lookup_client (client);
1001 return; /* client got disconnected in the meantime, drop message */
1002 unicast (tc, msg, may_drop);
1007 * Broadcast the new active address to all clients monitoring the peer.
1009 * @param peer peer this update is about (never NULL)
1010 * @param address address, NULL on disconnect
1013 GST_clients_broadcast_address_notification (const struct GNUNET_PeerIdentity
1015 const struct GNUNET_HELLO_Address
1018 struct AddressIterateResponseMessage *msg;
1019 struct MonitoringClient *mc;
1020 static struct GNUNET_PeerIdentity all_zeros;
1022 msg = compose_address_iterate_response_message (peer, address);
1023 mc = monitoring_clients_head;
1026 if ((0 == memcmp (&mc->peer, &all_zeros,
1027 sizeof (struct GNUNET_PeerIdentity))) ||
1028 (0 == memcmp (&mc->peer, peer,
1029 sizeof (struct GNUNET_PeerIdentity))))
1031 GNUNET_SERVER_notification_context_unicast (nc, mc->client,
1032 &msg->header, GNUNET_NO);
1041 /* end of file gnunet-service-transport_clients.c */