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.
10 GNUnet is distributed in the hope that it will be useful, but
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_manipulation.h"
34 #include "gnunet-service-transport.h"
35 #include "transport.h"
39 * How many messages can we have pending for a given client process
40 * before we start to drop incoming messages? We typically should
41 * have only one client and so this would be the primary buffer for
42 * messages, so the number should be chosen rather generously.
44 * The expectation here is that most of the time the queue is large
45 * enough so that a drop is virtually never required. Note that
46 * this value must be about as large as 'TOTAL_MSGS' in the
47 * 'test_transport_api_reliability.c', otherwise that testcase may
50 #define MAX_PENDING (128 * 1024)
54 * Linked list of messages to be transmitted to the client. Each
55 * entry is followed by the actual message.
57 struct ClientMessageQueueEntry
60 * This is a doubly-linked list.
62 struct ClientMessageQueueEntry *next;
65 * This is a doubly-linked list.
67 struct ClientMessageQueueEntry *prev;
72 * Client connected to the transport service.
74 struct TransportClient
78 * This is a doubly-linked list.
80 struct TransportClient *next;
83 * This is a doubly-linked list.
85 struct TransportClient *prev;
88 * Handle to the client.
90 struct GNUNET_SERVER_Client *client;
93 * Linked list of messages yet to be transmitted to
96 struct ClientMessageQueueEntry *message_queue_head;
99 * Tail of linked list of messages yet to be transmitted to the
102 struct ClientMessageQueueEntry *message_queue_tail;
105 * Current transmit request handle.
107 struct GNUNET_SERVER_TransmitHandle *th;
110 * Length of the list of messages pending for this client.
112 unsigned int message_count;
115 * Is this client interested in payload messages?
121 * Context for address to string operations
123 struct AddressToStringContext
126 * This is a doubly-linked list.
128 struct AddressToStringContext *next;
131 * This is a doubly-linked list.
133 struct AddressToStringContext *prev;
136 * Transmission context
138 struct GNUNET_SERVER_TransmitContext* tc;
142 * Client monitoring changes of active addresses of our neighbours.
144 struct MonitoringClient
147 * This is a doubly-linked list.
149 struct MonitoringClient *next;
152 * This is a doubly-linked list.
154 struct MonitoringClient *prev;
157 * Handle to the client.
159 struct GNUNET_SERVER_Client *client;
162 * Peer identity to monitor the addresses of.
163 * Zero to monitor all neighrours.
165 struct GNUNET_PeerIdentity peer;
171 * Head of linked list of all clients to this service.
173 static struct TransportClient *clients_head;
176 * Tail of linked list of all clients to this service.
178 static struct TransportClient *clients_tail;
181 * Head of linked list of all pending address iterations
183 struct AddressToStringContext *a2s_head;
186 * Tail of linked list of all pending address iterations
188 struct AddressToStringContext *a2s_tail;
191 * Head of linked list of monitoring clients.
193 static struct MonitoringClient *monitoring_clients_head;
196 * Tail of linked list of monitoring clients.
198 static struct MonitoringClient *monitoring_clients_tail;
201 * Notification context, to send updates on changes to active addresses
204 static struct GNUNET_SERVER_NotificationContext *nc;
208 * Find the internal handle associated with the given client handle
210 * @param client server's client handle to look up
211 * @return internal client handle
213 static struct TransportClient *
214 lookup_client (struct GNUNET_SERVER_Client *client)
216 struct TransportClient *tc;
218 for (tc = clients_head; NULL != tc; tc = tc->next)
219 if (tc->client == client)
226 * Create the internal handle for the given server client handle
228 * @param client server's client handle to create our internal handle for
229 * @return fresh internal client handle
231 static struct TransportClient *
232 setup_client (struct GNUNET_SERVER_Client *client)
234 struct TransportClient *tc;
236 GNUNET_assert (NULL == lookup_client (client));
237 tc = GNUNET_new (struct TransportClient);
239 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
240 "Client %p connected\n",
247 * Find the handle to the monitoring client associated with the given
250 * @param client server's client handle to look up
251 * @return handle to the monitoring client
253 static struct MonitoringClient *
254 lookup_monitoring_client (struct GNUNET_SERVER_Client *client)
256 struct MonitoringClient *mc;
258 for (mc = monitoring_clients_head; NULL != mc; mc = mc->next)
259 if (mc->client == client)
266 * Setup a new monitoring client using the given server client handle and
269 * @param client server's client handle to create our internal handle for
270 * @param peer identity of the peer to monitor the addresses of,
271 * zero to monitor all neighrours.
272 * @return handle to the new monitoring client
274 static struct MonitoringClient *
275 setup_monitoring_client (struct GNUNET_SERVER_Client *client,
276 struct GNUNET_PeerIdentity *peer)
278 struct MonitoringClient *mc;
279 static struct GNUNET_PeerIdentity all_zeros;
281 GNUNET_assert (lookup_monitoring_client (client) == NULL);
282 mc = GNUNET_new (struct MonitoringClient);
285 GNUNET_CONTAINER_DLL_insert (monitoring_clients_head,
286 monitoring_clients_tail,
288 GNUNET_SERVER_notification_context_add (nc, client);
290 if (0 != memcmp (peer, &all_zeros, sizeof (struct GNUNET_PeerIdentity)))
291 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
292 "Client %p started monitoring of the peer `%s'\n",
293 mc, GNUNET_i2s (peer));
295 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
296 "Client %p started monitoring all peers\n", mc);
302 * Function called to notify a client about the socket being ready to
303 * queue more data. "buf" will be NULL and "size" zero if the socket
304 * was closed for writing in the meantime.
307 * @param size number of bytes available in @a buf
308 * @param buf where the callee should write the message
309 * @return number of bytes written to @a buf
312 transmit_to_client_callback (void *cls, size_t size, void *buf)
314 struct TransportClient *tc = cls;
315 struct ClientMessageQueueEntry *q;
316 const struct GNUNET_MessageHeader *msg;
324 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
325 "Transmission to client failed, closing connection.\n");
330 while (NULL != (q = tc->message_queue_head))
332 msg = (const struct GNUNET_MessageHeader *) &q[1];
333 msize = ntohs (msg->size);
334 if (msize + tsize > size)
336 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
337 "Transmitting message of type %u to client %p.\n",
338 ntohs (msg->type), tc);
339 GNUNET_CONTAINER_DLL_remove (tc->message_queue_head,
340 tc->message_queue_tail,
343 memcpy (&cbuf[tsize], msg, msize);
349 GNUNET_assert (msize >= sizeof (struct GNUNET_MessageHeader));
351 GNUNET_SERVER_notify_transmit_ready (tc->client, msize,
352 GNUNET_TIME_UNIT_FOREVER_REL,
353 &transmit_to_client_callback, tc);
354 GNUNET_assert (NULL != tc->th);
361 * Queue the given message for transmission to the given client
363 * @param tc target of the message
364 * @param msg message to transmit
365 * @param may_drop #GNUNET_YES if the message can be dropped
368 unicast (struct TransportClient *tc,
369 const struct GNUNET_MessageHeader *msg,
372 struct ClientMessageQueueEntry *q;
381 if ((tc->message_count >= MAX_PENDING) && (GNUNET_YES == may_drop))
383 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
385 ("Dropping message of type %u and size %u, have %u/%u messages pending\n"),
386 ntohs (msg->type), ntohs (msg->size), tc->message_count,
388 GNUNET_STATISTICS_update (GST_stats,
390 ("# messages dropped due to slow client"), 1,
394 msize = ntohs (msg->size);
395 GNUNET_assert (msize >= sizeof (struct GNUNET_MessageHeader));
396 q = GNUNET_malloc (sizeof (struct ClientMessageQueueEntry) + msize);
397 memcpy (&q[1], msg, msize);
398 GNUNET_CONTAINER_DLL_insert_tail (tc->message_queue_head,
399 tc->message_queue_tail, q);
404 GNUNET_SERVER_notify_transmit_ready (tc->client, msize,
405 GNUNET_TIME_UNIT_FOREVER_REL,
406 &transmit_to_client_callback, tc);
407 GNUNET_assert (NULL != tc->th);
412 * Called whenever a client is disconnected. Frees our
413 * resources associated with that client.
416 * @param client identification of the client
419 client_disconnect_notification (void *cls, struct GNUNET_SERVER_Client *client)
421 struct TransportClient *tc;
422 struct MonitoringClient *mc;
423 struct ClientMessageQueueEntry *mqe;
427 mc = lookup_monitoring_client (client);
430 GNUNET_CONTAINER_DLL_remove (monitoring_clients_head,
431 monitoring_clients_tail,
435 tc = lookup_client (client);
438 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
439 "Client %p disconnected, cleaning up.\n", tc);
440 while (NULL != (mqe = tc->message_queue_head))
442 GNUNET_CONTAINER_DLL_remove (tc->message_queue_head, tc->message_queue_tail,
447 GNUNET_CONTAINER_DLL_remove (clients_head, clients_tail, tc);
450 GNUNET_SERVER_notify_transmit_ready_cancel (tc->th);
453 GNUNET_break (0 == tc->message_count);
459 * Function called for each of our connected neighbours. Notify the
460 * client about the existing neighbour.
462 * @param cls the 'struct TransportClient' to notify
463 * @param peer identity of the neighbour
464 * @param address the address
465 * @param bandwidth_in inbound bandwidth in NBO
466 * @param bandwidth_out outbound bandwidth in NBO
469 notify_client_about_neighbour (void *cls,
470 const struct GNUNET_PeerIdentity *peer,
471 const struct GNUNET_HELLO_Address *address,
472 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in,
473 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out)
475 struct TransportClient *tc = cls;
476 struct ConnectInfoMessage *cim;
477 size_t size = sizeof (struct ConnectInfoMessage);
478 char buf[size] GNUNET_ALIGN;
480 GNUNET_assert (size < GNUNET_SERVER_MAX_MESSAGE_SIZE);
481 cim = (struct ConnectInfoMessage *) buf;
482 cim->header.size = htons (size);
483 cim->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT);
485 cim->quota_in = bandwidth_in;
486 cim->quota_out = bandwidth_out;
487 unicast (tc, &cim->header, GNUNET_NO);
492 * Initialize a normal client. We got a start message from this
493 * client, add him to the list of clients for broadcasting of inbound
497 * @param client the client
498 * @param message the start message that was sent
501 clients_handle_start (void *cls, struct GNUNET_SERVER_Client *client,
502 const struct GNUNET_MessageHeader *message)
504 const struct StartMessage *start;
505 struct TransportClient *tc;
508 tc = lookup_client (client);
510 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
511 "Client %p sent START\n", tc);
514 /* got 'start' twice from the same client, not allowed */
515 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
516 "TransportClient %p ServerClient %p sent multiple START messages\n",
519 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
522 start = (const struct StartMessage *) message;
523 options = ntohl (start->options);
524 if ((0 != (1 & options)) &&
526 memcmp (&start->self, &GST_my_identity,
527 sizeof (struct GNUNET_PeerIdentity))))
529 /* client thinks this is a different peer, reject */
530 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
532 ("Rejecting control connection from peer `%s', which is not me!\n"),
533 GNUNET_i2s (&start->self));
534 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
537 tc = setup_client (client);
538 tc->send_payload = (0 != (2 & options));
539 unicast (tc, GST_hello_get (), GNUNET_NO);
540 GST_neighbours_iterate (¬ify_client_about_neighbour, tc);
541 GNUNET_CONTAINER_DLL_insert (clients_head, clients_tail, tc);
542 GNUNET_SERVER_receive_done (client, GNUNET_OK);
547 * Client sent us a HELLO. Process the request.
550 * @param client the client
551 * @param message the HELLO message
554 clients_handle_hello (void *cls, struct GNUNET_SERVER_Client *client,
555 const struct GNUNET_MessageHeader *message)
557 GST_validation_handle_hello (message);
558 GNUNET_SERVER_receive_done (client, GNUNET_OK);
563 * Closure for 'handle_send_transmit_continuation'
565 struct SendTransmitContinuationContext
568 * Client that made the request.
570 struct GNUNET_SERVER_Client *client;
573 * Peer that was the target.
575 struct GNUNET_PeerIdentity target;
580 * Function called after the transmission is done. Notify the client that it is
581 * OK to send the next message.
584 * @param success #GNUNET_OK on success, #GNUNET_NO on failure, #GNUNET_SYSERR if we're not connected
585 * @param bytes_payload bytes payload sent
586 * @param bytes_on_wire bytes sent on wire
589 handle_send_transmit_continuation (void *cls, int success,
590 size_t bytes_payload,
591 size_t bytes_on_wire)
593 struct SendTransmitContinuationContext *stcc = cls;
594 struct SendOkMessage send_ok_msg;
596 if (GNUNET_OK == success)
597 GST_neighbours_notify_payload_sent (&stcc->target, bytes_payload);
599 send_ok_msg.header.size = htons (sizeof (send_ok_msg));
600 send_ok_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SEND_OK);
601 send_ok_msg.bytes_msg = htonl (bytes_payload);
602 send_ok_msg.bytes_physical = htonl (bytes_on_wire);
603 send_ok_msg.success = htonl (success);
604 send_ok_msg.latency =
605 GNUNET_TIME_relative_hton (GNUNET_TIME_UNIT_FOREVER_REL);
606 send_ok_msg.peer = stcc->target;
607 GST_clients_unicast (stcc->client, &send_ok_msg.header, GNUNET_NO);
608 GNUNET_SERVER_client_drop (stcc->client);
614 * Client asked for transmission to a peer. Process the request.
617 * @param client the client
618 * @param message the send message that was sent
621 clients_handle_send (void *cls,
622 struct GNUNET_SERVER_Client *client,
623 const struct GNUNET_MessageHeader *message)
625 const struct OutboundMessage *obm;
626 const struct GNUNET_MessageHeader *obmm;
627 struct SendTransmitContinuationContext *stcc;
630 struct TransportClient *tc;
632 tc = lookup_client (client);
635 /* client asked for transmission before 'START' */
637 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
641 size = ntohs (message->size);
643 sizeof (struct OutboundMessage) + sizeof (struct GNUNET_MessageHeader))
646 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
649 obm = (const struct OutboundMessage *) message;
650 obmm = (const struct GNUNET_MessageHeader *) &obm[1];
651 msize = size - sizeof (struct OutboundMessage);
652 if (msize < sizeof (struct GNUNET_MessageHeader))
655 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
659 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
660 "Received `%s' request from client with target `%4s' and first message of type %u and total size %u\n",
662 GNUNET_i2s (&obm->peer),
665 if (GNUNET_NO == GST_neighbours_test_connected (&obm->peer))
667 /* not connected, not allowed to send; can happen due to asynchronous operations */
668 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
669 "Could not send message to peer `%s': not connected\n",
670 GNUNET_i2s (&obm->peer));
671 GNUNET_STATISTICS_update (GST_stats,
673 ("# bytes payload dropped (other peer was not connected)"),
675 GNUNET_SERVER_receive_done (client, GNUNET_OK);
678 GNUNET_SERVER_receive_done (client, GNUNET_OK);
679 stcc = GNUNET_malloc (sizeof (struct SendTransmitContinuationContext));
680 stcc->target = obm->peer;
681 stcc->client = client;
682 GNUNET_SERVER_client_keep (client);
683 GST_manipulation_send (&obm->peer, obmm, msize,
684 GNUNET_TIME_relative_ntoh (obm->timeout),
685 &handle_send_transmit_continuation, stcc);
690 * Try to initiate a connection to the given peer if the blacklist
693 * @param cls closure (unused, NULL)
694 * @param peer identity of peer that was tested
695 * @param result #GNUNET_OK if the connection is allowed,
699 try_connect_if_allowed (void *cls,
700 const struct GNUNET_PeerIdentity *peer,
703 if (GNUNET_OK != result)
705 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
706 "Blacklist refuses connection attempt to peer `%s'\n",
708 return; /* not allowed */
710 GST_neighbours_try_connect (peer);
715 * Handle request connect message
717 * @param cls closure (always NULL)
718 * @param client identification of the client
719 * @param message the actual message
722 clients_handle_request_connect (void *cls, struct GNUNET_SERVER_Client *client,
723 const struct GNUNET_MessageHeader *message)
725 const struct TransportRequestConnectMessage *trcm =
726 (const struct TransportRequestConnectMessage *) message;
728 GNUNET_STATISTICS_update (GST_stats,
730 ("# REQUEST CONNECT messages received"), 1,
733 if (0 == memcmp (&trcm->peer, &GST_my_identity,
734 sizeof (struct GNUNET_PeerIdentity)))
737 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
738 "Received a request connect message myself `%s'\n",
739 GNUNET_i2s (&trcm->peer));
743 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
744 "Received a request connect message for peer `%s'\n",
745 GNUNET_i2s (&trcm->peer));
747 (void) GST_blacklist_test_allowed (&trcm->peer, NULL, &try_connect_if_allowed,
750 GNUNET_SERVER_receive_done (client, GNUNET_OK);
755 * Take the given address and append it to the set of results sent back to
758 * @param cls the transmission context used ('struct GNUNET_SERVER_TransmitContext*')
759 * @param buf text to transmit
762 transmit_address_to_client (void *cls, const char *buf)
764 struct AddressToStringContext *actx = cls;
767 GNUNET_SERVER_transmit_context_append_data (actx->tc, NULL, 0,
768 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_TO_STRING_REPLY);
769 GNUNET_SERVER_transmit_context_run (actx->tc, GNUNET_TIME_UNIT_FOREVER_REL);
770 GNUNET_CONTAINER_DLL_remove (a2s_head, a2s_tail, actx);
774 GNUNET_SERVER_transmit_context_append_data (actx->tc, buf, strlen (buf) + 1,
775 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_TO_STRING_REPLY);
780 * Client asked to resolve an address. Process the request.
783 * @param client the client
784 * @param message the resolution request
787 clients_handle_address_to_string (void *cls,
788 struct GNUNET_SERVER_Client *client,
789 const struct GNUNET_MessageHeader *message)
791 const struct AddressLookupMessage *alum;
792 struct GNUNET_TRANSPORT_PluginFunctions *papi;
793 const char *plugin_name;
795 uint32_t address_len;
797 struct GNUNET_SERVER_TransmitContext *tc;
798 struct AddressToStringContext *actx;
799 struct GNUNET_TIME_Relative rtimeout;
802 size = ntohs (message->size);
803 if (size < sizeof (struct AddressLookupMessage))
806 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
809 alum = (const struct AddressLookupMessage *) message;
810 address_len = ntohs (alum->addrlen);
811 if (size <= sizeof (struct AddressLookupMessage) + address_len)
814 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
817 address = (const char *) &alum[1];
818 plugin_name = (const char *) &address[address_len];
819 if (plugin_name[size - sizeof (struct AddressLookupMessage) - address_len - 1]
823 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
826 rtimeout = GNUNET_TIME_relative_ntoh (alum->timeout);
827 numeric = ntohs (alum->numeric_only);
828 tc = GNUNET_SERVER_transmit_context_create (client);
829 papi = GST_plugins_printer_find (plugin_name);
832 GNUNET_SERVER_transmit_context_append_data (tc, NULL, 0,
833 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_TO_STRING_REPLY);
834 GNUNET_SERVER_transmit_context_run (tc, rtimeout);
837 actx = GNUNET_new (struct AddressToStringContext);
839 GNUNET_CONTAINER_DLL_insert (a2s_head, a2s_tail, actx);
840 GNUNET_SERVER_disable_receive_done_warning (client);
841 papi->address_pretty_printer (papi->cls, plugin_name, address, address_len,
842 numeric, rtimeout, &transmit_address_to_client,
848 * Compose AddressIterateResponseMessage using the given peer and address.
850 * @param peer identity of the peer
851 * @param address the address, NULL on disconnect
852 * @return composed message
854 static struct AddressIterateResponseMessage *
855 compose_address_iterate_response_message (const struct GNUNET_PeerIdentity *peer,
856 const struct GNUNET_HELLO_Address *address)
858 struct AddressIterateResponseMessage *msg;
864 GNUNET_assert (NULL != peer);
867 tlen = strlen (address->transport_name) + 1;
868 alen = address->address_length;
872 size = (sizeof (struct AddressIterateResponseMessage) + alen + tlen);
873 msg = GNUNET_malloc (size);
874 msg->header.size = htons (size);
876 htons (GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_ITERATE_RESPONSE);
877 msg->reserved = htonl (0);
879 msg->addrlen = htonl (alen);
880 msg->pluginlen = htonl (tlen);
883 addr = (char *) &msg[1];
884 memcpy (addr, address->address, alen);
885 memcpy (&addr[alen], address->transport_name, tlen);
892 * Output the active address of connected neighbours to the given client.
894 * @param cls the 'struct GNUNET_SERVER_TransmitContext' for transmission to the client
895 * @param peer identity of the neighbour
896 * @param address the address
897 * @param bandwidth_in inbound quota in NBO
898 * @param bandwidth_out outbound quota in NBO
901 output_address (void *cls, const struct GNUNET_PeerIdentity *peer,
902 const struct GNUNET_HELLO_Address *address,
903 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in,
904 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out)
906 struct GNUNET_SERVER_TransmitContext *tc = cls;
907 struct AddressIterateResponseMessage *msg;
909 msg = compose_address_iterate_response_message (peer, address);
910 GNUNET_SERVER_transmit_context_append_message (tc, &msg->header);
916 * Client asked to obtain information about all actively used addresses
918 * Process the request.
921 * @param client the client
922 * @param message the peer address information request
925 clients_handle_address_iterate (void *cls, struct GNUNET_SERVER_Client *client,
926 const struct GNUNET_MessageHeader *message)
928 static struct GNUNET_PeerIdentity all_zeros;
929 struct GNUNET_SERVER_TransmitContext *tc;
930 struct AddressIterateMessage *msg;
931 struct GNUNET_HELLO_Address *address;
933 if (ntohs (message->type) != GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_ITERATE)
936 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
939 if (ntohs (message->size) != sizeof (struct AddressIterateMessage))
942 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
945 msg = (struct AddressIterateMessage *) message;
946 if ( (GNUNET_YES != ntohl (msg->one_shot)) &&
947 (NULL != lookup_monitoring_client (client)) )
949 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
950 "ServerClient %p tried to start monitoring twice\n",
953 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
956 GNUNET_SERVER_disable_receive_done_warning (client);
957 tc = GNUNET_SERVER_transmit_context_create (client);
958 if (0 == memcmp (&msg->peer, &all_zeros, sizeof (struct GNUNET_PeerIdentity)))
960 /* iterate over all neighbours */
961 GST_neighbours_iterate (&output_address, tc);
965 /* just return one neighbour */
966 address = GST_neighbour_get_current_address (&msg->peer);
968 output_address (tc, &msg->peer, address,
969 GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT,
970 GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT);
972 if (GNUNET_YES != ntohl (msg->one_shot))
973 setup_monitoring_client (client, &msg->peer);
975 GNUNET_SERVER_transmit_context_append_data (tc, NULL, 0,
976 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_ITERATE_RESPONSE);
977 GNUNET_SERVER_transmit_context_run (tc, GNUNET_TIME_UNIT_FOREVER_REL);
982 * Start handling requests from clients.
984 * @param server server used to accept clients from.
987 GST_clients_start (struct GNUNET_SERVER_Handle *server)
989 static const struct GNUNET_SERVER_MessageHandler handlers[] = {
990 {&clients_handle_start, NULL,
991 GNUNET_MESSAGE_TYPE_TRANSPORT_START, sizeof (struct StartMessage)},
992 {&clients_handle_hello, NULL,
993 GNUNET_MESSAGE_TYPE_HELLO, 0},
994 {&clients_handle_send, NULL,
995 GNUNET_MESSAGE_TYPE_TRANSPORT_SEND, 0},
996 {&clients_handle_request_connect, NULL,
997 GNUNET_MESSAGE_TYPE_TRANSPORT_REQUEST_CONNECT,
998 sizeof (struct TransportRequestConnectMessage)},
999 {&clients_handle_address_to_string, NULL,
1000 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_TO_STRING, 0},
1001 {&clients_handle_address_iterate, NULL,
1002 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_ITERATE,
1003 sizeof (struct AddressIterateMessage)},
1004 {&GST_blacklist_handle_init, NULL,
1005 GNUNET_MESSAGE_TYPE_TRANSPORT_BLACKLIST_INIT,
1006 sizeof (struct GNUNET_MessageHeader)},
1007 {&GST_blacklist_handle_reply, NULL,
1008 GNUNET_MESSAGE_TYPE_TRANSPORT_BLACKLIST_REPLY,
1009 sizeof (struct BlacklistMessage)},
1010 {&GST_manipulation_set_metric, NULL,
1011 GNUNET_MESSAGE_TYPE_TRANSPORT_TRAFFIC_METRIC, 0},
1014 nc = GNUNET_SERVER_notification_context_create (server, 0);
1015 GNUNET_SERVER_add_handlers (server, handlers);
1016 GNUNET_SERVER_disconnect_notify (server, &client_disconnect_notification,
1022 * Stop processing clients.
1027 struct AddressToStringContext *cur;
1029 while (NULL != (cur = a2s_head))
1031 GNUNET_SERVER_transmit_context_destroy (cur->tc, GNUNET_NO);
1032 GNUNET_CONTAINER_DLL_remove (a2s_head, a2s_tail, cur);
1037 GNUNET_SERVER_notification_context_destroy (nc);
1044 * Broadcast the given message to all of our clients.
1046 * @param msg message to broadcast
1047 * @param may_drop #GNUNET_YES if the message can be dropped / is payload
1050 GST_clients_broadcast (const struct GNUNET_MessageHeader *msg, int may_drop)
1052 struct TransportClient *tc;
1054 for (tc = clients_head; NULL != tc; tc = tc->next)
1056 if ((GNUNET_YES == may_drop) && (GNUNET_YES != tc->send_payload))
1057 continue; /* skip, this client does not care about payload */
1058 unicast (tc, msg, may_drop);
1064 * Send the given message to a particular client
1066 * @param client target of the message
1067 * @param msg message to transmit
1068 * @param may_drop #GNUNET_YES if the message can be dropped
1071 GST_clients_unicast (struct GNUNET_SERVER_Client *client,
1072 const struct GNUNET_MessageHeader *msg, int may_drop)
1074 struct TransportClient *tc;
1076 tc = lookup_client (client);
1078 return; /* client got disconnected in the meantime, drop message */
1079 unicast (tc, msg, may_drop);
1084 * Broadcast the new active address to all clients monitoring the peer.
1086 * @param peer peer this update is about (never NULL)
1087 * @param address address, NULL on disconnect
1090 GST_clients_broadcast_address_notification (const struct GNUNET_PeerIdentity *peer,
1091 const struct GNUNET_HELLO_Address *address)
1093 struct AddressIterateResponseMessage *msg;
1094 struct MonitoringClient *mc;
1095 static struct GNUNET_PeerIdentity all_zeros;
1096 msg = compose_address_iterate_response_message (peer, address);
1097 mc = monitoring_clients_head;
1100 if ((0 == memcmp (&mc->peer, &all_zeros,
1101 sizeof (struct GNUNET_PeerIdentity))) ||
1102 (0 == memcmp (&mc->peer, peer,
1103 sizeof (struct GNUNET_PeerIdentity))))
1105 GNUNET_SERVER_notification_context_unicast (nc, mc->client,
1106 &msg->header, GNUNET_NO);
1115 /* end of file gnunet-service-transport_clients.c */