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
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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.
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17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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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"
38 * How many messages can we have pending for a given client process
39 * before we start to drop incoming messages? We typically should
40 * have only one client and so this would be the primary buffer for
41 * messages, so the number should be chosen rather generously.
43 * The expectation here is that most of the time the queue is large
44 * enough so that a drop is virtually never required. Note that
45 * this value must be about as large as 'TOTAL_MSGS' in the
46 * 'test_transport_api_reliability.c', otherwise that testcase may
49 #define MAX_PENDING (128 * 1024)
53 * Linked list of messages to be transmitted to the client. Each
54 * entry is followed by the actual message.
56 struct ClientMessageQueueEntry
59 * This is a doubly-linked list.
61 struct ClientMessageQueueEntry *next;
64 * This is a doubly-linked list.
66 struct ClientMessageQueueEntry *prev;
71 * Client connected to the transport service.
73 struct TransportClient
77 * This is a doubly-linked list.
79 struct TransportClient *next;
82 * This is a doubly-linked list.
84 struct TransportClient *prev;
87 * Handle to the client.
89 struct GNUNET_SERVER_Client *client;
92 * Linked list of messages yet to be transmitted to
95 struct ClientMessageQueueEntry *message_queue_head;
98 * Tail of linked list of messages yet to be transmitted to the
101 struct ClientMessageQueueEntry *message_queue_tail;
104 * Current transmit request handle.
106 struct GNUNET_SERVER_TransmitHandle *th;
109 * Length of the list of messages pending for this client.
111 unsigned int message_count;
114 * Is this client interested in payload messages?
121 * Client monitoring changes of active addresses of our neighbours.
123 struct MonitoringClient
126 * This is a doubly-linked list.
128 struct MonitoringClient *next;
131 * This is a doubly-linked list.
133 struct MonitoringClient *prev;
136 * Handle to the client.
138 struct GNUNET_SERVER_Client *client;
141 * Peer identity to monitor the addresses of.
142 * Zero to monitor all neighrours.
144 struct GNUNET_PeerIdentity peer;
150 * Head of linked list of all clients to this service.
152 static struct TransportClient *clients_head;
155 * Tail of linked list of all clients to this service.
157 static struct TransportClient *clients_tail;
160 * Head of linked list of monitoring clients.
162 static struct MonitoringClient *monitoring_clients_head;
165 * Tail of linked list of monitoring clients.
167 static struct MonitoringClient *monitoring_clients_tail;
170 * Notification context, to send updates on changes to active addresses
173 struct GNUNET_SERVER_NotificationContext *nc = NULL;
177 * Find the internal handle associated with the given client handle
179 * @param client server's client handle to look up
180 * @return internal client handle
182 static struct TransportClient *
183 lookup_client (struct GNUNET_SERVER_Client *client)
185 struct TransportClient *tc;
190 if (tc->client == client)
199 * Create the internal handle for the given server client handle
201 * @param client server's client handle to create our internal handle for
202 * @return fresh internal client handle
204 static struct TransportClient *
205 setup_client (struct GNUNET_SERVER_Client *client)
207 struct TransportClient *tc;
209 GNUNET_assert (lookup_client (client) == NULL);
210 tc = GNUNET_malloc (sizeof (struct TransportClient));
212 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Client %p connected\n", tc);
218 * Find the handle to the monitoring client associated with the given
221 * @param client server's client handle to look up
222 * @return handle to the monitoring client
224 static struct MonitoringClient *
225 lookup_monitoring_client (struct GNUNET_SERVER_Client *client)
227 struct MonitoringClient *mc;
229 mc = monitoring_clients_head;
232 if (mc->client == client)
241 * Setup a new monitoring client using the given server client handle and
244 * @param client server's client handle to create our internal handle for
245 * @param peer identity of the peer to monitor the addresses of,
246 * zero to monitor all neighrours.
247 * @return handle to the new monitoring client
249 static struct MonitoringClient *
250 setup_monitoring_client (struct GNUNET_SERVER_Client *client,
251 struct GNUNET_PeerIdentity *peer)
253 struct MonitoringClient *mc;
255 GNUNET_assert (lookup_monitoring_client (client) == NULL);
256 mc = GNUNET_malloc (sizeof (struct MonitoringClient));
259 GNUNET_CONTAINER_DLL_insert (monitoring_clients_head,
260 monitoring_clients_tail,
262 GNUNET_SERVER_notification_context_add (nc, client);
264 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
265 "Client %p started monitoring of the peer `%s'\n",
266 mc, GNUNET_i2s (peer));
272 * Function called to notify a client about the socket being ready to
273 * queue more data. "buf" will be NULL and "size" zero if the socket
274 * was closed for writing in the meantime.
277 * @param size number of bytes available in buf
278 * @param buf where the callee should write the message
279 * @return number of bytes written to buf
282 transmit_to_client_callback (void *cls, size_t size, void *buf)
284 struct TransportClient *tc = cls;
285 struct ClientMessageQueueEntry *q;
286 const struct GNUNET_MessageHeader *msg;
294 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
295 "Transmission to client failed, closing connection.\n");
300 while (NULL != (q = tc->message_queue_head))
302 msg = (const struct GNUNET_MessageHeader *) &q[1];
303 msize = ntohs (msg->size);
304 if (msize + tsize > size)
306 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
307 "Transmitting message of type %u to client %p.\n",
308 ntohs (msg->type), tc);
309 GNUNET_CONTAINER_DLL_remove (tc->message_queue_head, tc->message_queue_tail,
312 memcpy (&cbuf[tsize], msg, msize);
318 GNUNET_assert (msize >= sizeof (struct GNUNET_MessageHeader));
320 GNUNET_SERVER_notify_transmit_ready (tc->client, msize,
321 GNUNET_TIME_UNIT_FOREVER_REL,
322 &transmit_to_client_callback, tc);
323 GNUNET_assert (tc->th != NULL);
330 * Queue the given message for transmission to the given client
332 * @param tc target of the message
333 * @param msg message to transmit
334 * @param may_drop GNUNET_YES if the message can be dropped
337 unicast (struct TransportClient *tc, const struct GNUNET_MessageHeader *msg,
340 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);
406 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
407 "Client %p disconnected, cleaning up.\n", tc);
408 while (NULL != (mqe = tc->message_queue_head))
410 GNUNET_CONTAINER_DLL_remove (tc->message_queue_head, tc->message_queue_tail,
415 GNUNET_CONTAINER_DLL_remove (clients_head, clients_tail, tc);
418 GNUNET_SERVER_notify_transmit_ready_cancel (tc->th);
421 GNUNET_break (0 == tc->message_count);
427 * Function called for each of our connected neighbours. Notify the
428 * client about the existing neighbour.
430 * @param cls the 'struct TransportClient' to notify
431 * @param peer identity of the neighbour
432 * @param ats performance data
433 * @param ats_count number of entries in ats (excluding 0-termination)
434 * @param address the address
435 * @param bandwidth_in inbound bandwidth in NBO
436 * @param bandwidth_out outbound bandwidth in NBO
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,
444 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in,
445 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out)
447 struct TransportClient *tc = cls;
448 struct ConnectInfoMessage *cim;
449 struct GNUNET_ATS_Information *ap;
451 sizeof (struct ConnectInfoMessage) +
452 ats_count * sizeof (struct GNUNET_ATS_Information);
453 char buf[size] GNUNET_ALIGN;
455 GNUNET_assert (size < GNUNET_SERVER_MAX_MESSAGE_SIZE);
456 cim = (struct ConnectInfoMessage *) buf;
457 cim->header.size = htons (size);
458 cim->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT);
459 cim->ats_count = htonl (ats_count);
461 cim->quota_in = bandwidth_in;
462 cim->quota_out = bandwidth_out;
463 ap = (struct GNUNET_ATS_Information *) &cim[1];
464 memcpy (ap, ats, ats_count * sizeof (struct GNUNET_ATS_Information));
465 unicast (tc, &cim->header, GNUNET_NO);
470 * Initialize a normal client. We got a start message from this
471 * client, add him to the list of clients for broadcasting of inbound
475 * @param client the client
476 * @param message the start message that was sent
479 clients_handle_start (void *cls, struct GNUNET_SERVER_Client *client,
480 const struct GNUNET_MessageHeader *message)
482 const struct StartMessage *start;
483 struct TransportClient *tc;
486 tc = lookup_client (client);
488 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
489 "Client %p sent START\n", tc);
492 /* got 'start' twice from the same client, not allowed */
493 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
494 "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
563 * @param bytes_payload bytes payload sent
564 * @param bytes_on_wire bytes sent on wire
567 handle_send_transmit_continuation (void *cls, int success,
568 size_t bytes_payload, size_t bytes_on_wire)
570 struct SendTransmitContinuationContext *stcc = cls;
571 struct SendOkMessage send_ok_msg;
573 //GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Payload: %u, On wire %u result: %i\n", bytes_payload, bytes_on_wire, success);
575 if (GNUNET_OK == success)
576 GNUNET_assert (bytes_on_wire >= bytes_payload);
579 GNUNET_assert (bytes_on_wire <= bytes_payload);
581 send_ok_msg.header.size = htons (sizeof (send_ok_msg));
582 send_ok_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SEND_OK);
583 send_ok_msg.bytes_msg = htonl (bytes_payload);
584 send_ok_msg.bytes_physical = htonl (bytes_on_wire);
585 send_ok_msg.success = htonl (success);
586 send_ok_msg.latency =
587 GNUNET_TIME_relative_hton (GNUNET_TIME_UNIT_FOREVER_REL);
588 send_ok_msg.peer = stcc->target;
589 GST_clients_unicast (stcc->client, &send_ok_msg.header, GNUNET_NO);
590 GNUNET_SERVER_client_drop (stcc->client);
596 * Client asked for transmission to a peer. Process the request.
599 * @param client the client
600 * @param message the send message that was sent
603 clients_handle_send (void *cls, struct GNUNET_SERVER_Client *client,
604 const struct GNUNET_MessageHeader *message)
606 const struct OutboundMessage *obm;
607 const struct GNUNET_MessageHeader *obmm;
608 struct SendTransmitContinuationContext *stcc;
611 struct TransportClient *tc;
613 tc = lookup_client (client);
616 /* client asked for transmission before 'START' */
618 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
622 size = ntohs (message->size);
624 sizeof (struct OutboundMessage) + sizeof (struct GNUNET_MessageHeader))
627 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
630 obm = (const struct OutboundMessage *) message;
631 obmm = (const struct GNUNET_MessageHeader *) &obm[1];
632 msize = size - sizeof (struct OutboundMessage);
633 if (msize < sizeof (struct GNUNET_MessageHeader))
636 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
640 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
641 "Received `%s' request from client with target `%4s' and first message of type %u and total size %u\n",
642 "SEND", GNUNET_i2s (&obm->peer), ntohs (obmm->type), msize);
643 if (GNUNET_NO == GST_neighbours_test_connected (&obm->peer))
645 /* not connected, not allowed to send; can happen due to asynchronous operations */
646 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
647 "Could not send message to peer `%s': not connected\n",
648 GNUNET_i2s (&obm->peer));
649 GNUNET_STATISTICS_update (GST_stats,
651 ("# bytes payload dropped (other peer was not connected)"),
653 GNUNET_SERVER_receive_done (client, GNUNET_OK);
656 GNUNET_SERVER_receive_done (client, GNUNET_OK);
657 stcc = GNUNET_malloc (sizeof (struct SendTransmitContinuationContext));
658 stcc->target = obm->peer;
659 stcc->client = client;
660 GNUNET_SERVER_client_keep (client);
661 GST_neighbours_send (&obm->peer, obmm, msize,
662 GNUNET_TIME_relative_ntoh (obm->timeout),
663 &handle_send_transmit_continuation, stcc);
668 * Try to initiate a connection to the given peer if the blacklist
671 * @param cls closure (unused, NULL)
672 * @param peer identity of peer that was tested
673 * @param result GNUNET_OK if the connection is allowed,
677 try_connect_if_allowed (void *cls, const struct GNUNET_PeerIdentity *peer,
680 if (GNUNET_OK != result)
681 return; /* not allowed */
682 GST_neighbours_try_connect (peer);
687 * Handle request connect message
689 * @param cls closure (always NULL)
690 * @param client identification of the client
691 * @param message the actual message
694 clients_handle_request_connect (void *cls, struct GNUNET_SERVER_Client *client,
695 const struct GNUNET_MessageHeader *message)
697 const struct TransportRequestConnectMessage *trcm =
698 (const struct TransportRequestConnectMessage *) message;
700 GNUNET_STATISTICS_update (GST_stats,
702 ("# REQUEST CONNECT messages received"), 1,
704 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
705 "Received a request connect message for peer `%s'\n",
706 GNUNET_i2s (&trcm->peer));
707 (void) GST_blacklist_test_allowed (&trcm->peer, NULL, &try_connect_if_allowed,
709 GNUNET_SERVER_receive_done (client, GNUNET_OK);
714 * Take the given address and append it to the set of results sent back to
717 * @param cls the transmission context used ('struct GNUNET_SERVER_TransmitContext*')
718 * @param buf text to transmit
721 transmit_address_to_client (void *cls, const char *buf)
723 struct GNUNET_SERVER_TransmitContext *tc = cls;
727 GNUNET_SERVER_transmit_context_append_data (tc, NULL, 0,
728 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_TO_STRING_REPLY);
729 GNUNET_SERVER_transmit_context_run (tc, GNUNET_TIME_UNIT_FOREVER_REL);
732 GNUNET_SERVER_transmit_context_append_data (tc, buf, strlen (buf) + 1,
733 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_TO_STRING_REPLY);
738 * Client asked to resolve an address. Process the request.
741 * @param client the client
742 * @param message the resolution request
745 clients_handle_address_to_string (void *cls,
746 struct GNUNET_SERVER_Client *client,
747 const struct GNUNET_MessageHeader *message)
749 const struct AddressLookupMessage *alum;
750 struct GNUNET_TRANSPORT_PluginFunctions *papi;
751 const char *plugin_name;
753 uint32_t address_len;
755 struct GNUNET_SERVER_TransmitContext *tc;
756 struct GNUNET_TIME_Relative rtimeout;
759 size = ntohs (message->size);
760 if (size < sizeof (struct AddressLookupMessage))
763 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
766 alum = (const struct AddressLookupMessage *) message;
767 address_len = ntohs (alum->addrlen);
768 if (size <= sizeof (struct AddressLookupMessage) + address_len)
771 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
774 address = (const char *) &alum[1];
775 plugin_name = (const char *) &address[address_len];
776 if (plugin_name[size - sizeof (struct AddressLookupMessage) - address_len - 1]
780 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
783 rtimeout = GNUNET_TIME_relative_ntoh (alum->timeout);
784 numeric = ntohs (alum->numeric_only);
785 tc = GNUNET_SERVER_transmit_context_create (client);
786 papi = GST_plugins_printer_find (plugin_name);
789 GNUNET_SERVER_transmit_context_append_data (tc, NULL, 0,
790 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_TO_STRING_REPLY);
791 GNUNET_SERVER_transmit_context_run (tc, rtimeout);
794 GNUNET_SERVER_disable_receive_done_warning (client);
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
855 * @param bandwidth_in inbound quota in NBO
856 * @param bandwidth_out outbound quota in NBO
859 output_address (void *cls, const struct GNUNET_PeerIdentity *peer,
860 const struct GNUNET_ATS_Information *ats, uint32_t ats_count,
861 const struct GNUNET_HELLO_Address *address,
862 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in,
863 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out)
865 struct GNUNET_SERVER_TransmitContext *tc = cls;
866 struct AddressIterateResponseMessage *msg;
868 msg = compose_address_iterate_response_message (peer, address);
869 GNUNET_SERVER_transmit_context_append_message (tc, &msg->header);
875 * Client asked to obtain information about all actively used addresses
877 * Process the request.
880 * @param client the client
881 * @param message the peer address information request
884 clients_handle_address_iterate (void *cls, struct GNUNET_SERVER_Client *client,
885 const struct GNUNET_MessageHeader *message)
887 static struct GNUNET_PeerIdentity all_zeros;
888 struct GNUNET_SERVER_TransmitContext *tc;
889 struct AddressIterateMessage *msg;
890 struct GNUNET_HELLO_Address *address;
892 if (ntohs (message->type) != GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_ITERATE)
895 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
898 if (ntohs (message->size) != sizeof (struct AddressIterateMessage))
901 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
904 msg = (struct AddressIterateMessage *) message;
905 if ( (GNUNET_YES != ntohl (msg->one_shot)) &&
906 (NULL != lookup_monitoring_client (client)) )
908 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
909 "ServerClient %p tried to start monitoring twice\n",
912 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
915 GNUNET_SERVER_disable_receive_done_warning (client);
916 tc = GNUNET_SERVER_transmit_context_create (client);
917 if (0 == memcmp (&msg->peer, &all_zeros, sizeof (struct GNUNET_PeerIdentity)))
919 /* iterate over all neighbours */
920 GST_neighbours_iterate (&output_address, tc);
924 /* just return one neighbour */
925 address = GST_neighbour_get_current_address (&msg->peer);
927 output_address (tc, &msg->peer, NULL, 0, address,
928 GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT,
929 GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT);
931 if (GNUNET_YES != ntohl (msg->one_shot))
932 setup_monitoring_client (client, &msg->peer);
934 GNUNET_SERVER_transmit_context_append_data (tc, NULL, 0,
935 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_ITERATE_RESPONSE);
936 GNUNET_SERVER_transmit_context_run (tc, GNUNET_TIME_UNIT_FOREVER_REL);
941 * Start handling requests from clients.
943 * @param server server used to accept clients from.
946 GST_clients_start (struct GNUNET_SERVER_Handle *server)
948 static const struct GNUNET_SERVER_MessageHandler handlers[] = {
949 {&clients_handle_start, NULL,
950 GNUNET_MESSAGE_TYPE_TRANSPORT_START, sizeof (struct StartMessage)},
951 {&clients_handle_hello, NULL,
952 GNUNET_MESSAGE_TYPE_HELLO, 0},
953 {&clients_handle_send, NULL,
954 GNUNET_MESSAGE_TYPE_TRANSPORT_SEND, 0},
955 {&clients_handle_request_connect, NULL,
956 GNUNET_MESSAGE_TYPE_TRANSPORT_REQUEST_CONNECT,
957 sizeof (struct TransportRequestConnectMessage)},
958 {&clients_handle_address_to_string, NULL,
959 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_TO_STRING, 0},
960 {&clients_handle_address_iterate, NULL,
961 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_ITERATE,
962 sizeof (struct AddressIterateMessage)},
963 {&GST_blacklist_handle_init, NULL,
964 GNUNET_MESSAGE_TYPE_TRANSPORT_BLACKLIST_INIT,
965 sizeof (struct GNUNET_MessageHeader)},
966 {&GST_blacklist_handle_reply, NULL,
967 GNUNET_MESSAGE_TYPE_TRANSPORT_BLACKLIST_REPLY,
968 sizeof (struct BlacklistMessage)},
971 nc = GNUNET_SERVER_notification_context_create (server, 0);
972 GNUNET_SERVER_add_handlers (server, handlers);
973 GNUNET_SERVER_disconnect_notify (server, &client_disconnect_notification,
979 * Stop processing clients.
986 GNUNET_SERVER_notification_context_destroy (nc);
992 * Broadcast the given message to all of our clients.
994 * @param msg message to broadcast
995 * @param may_drop GNUNET_YES if the message can be dropped / is payload
998 GST_clients_broadcast (const struct GNUNET_MessageHeader *msg, int may_drop)
1000 struct TransportClient *tc;
1002 for (tc = clients_head; tc != NULL; tc = tc->next)
1004 if ((GNUNET_YES == may_drop) && (GNUNET_YES != tc->send_payload))
1005 continue; /* skip, this client does not care about payload */
1006 unicast (tc, msg, may_drop);
1012 * Send the given message to a particular client
1014 * @param client target of the message
1015 * @param msg message to transmit
1016 * @param may_drop GNUNET_YES if the message can be dropped
1019 GST_clients_unicast (struct GNUNET_SERVER_Client *client,
1020 const struct GNUNET_MessageHeader *msg, int may_drop)
1022 struct TransportClient *tc;
1024 tc = lookup_client (client);
1026 return; /* client got disconnected in the meantime, drop message */
1027 unicast (tc, msg, may_drop);
1032 * Broadcast the new active address to all clients monitoring the peer.
1034 * @param peer peer this update is about (never NULL)
1035 * @param address address, NULL on disconnect
1038 GST_clients_broadcast_address_notification (const struct GNUNET_PeerIdentity
1040 const struct GNUNET_HELLO_Address
1043 struct AddressIterateResponseMessage *msg;
1044 struct MonitoringClient *mc;
1045 static struct GNUNET_PeerIdentity all_zeros;
1047 msg = compose_address_iterate_response_message (peer, address);
1048 mc = monitoring_clients_head;
1051 if ((0 == memcmp (&mc->peer, &all_zeros,
1052 sizeof (struct GNUNET_PeerIdentity))) ||
1053 (0 == memcmp (&mc->peer, peer,
1054 sizeof (struct GNUNET_PeerIdentity))))
1056 GNUNET_SERVER_notification_context_unicast (nc, mc->client,
1057 &msg->header, GNUNET_NO);
1066 /* end of file gnunet-service-transport_clients.c */