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.
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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 struct GNUNET_SERVER_NotificationContext *nc = NULL;
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;
221 if (tc->client == client)
230 * Create the internal handle for the given server client handle
232 * @param client server's client handle to create our internal handle for
233 * @return fresh internal client handle
235 static struct TransportClient *
236 setup_client (struct GNUNET_SERVER_Client *client)
238 struct TransportClient *tc;
240 GNUNET_assert (lookup_client (client) == NULL);
241 tc = GNUNET_malloc (sizeof (struct TransportClient));
243 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Client %p connected\n", tc);
249 * Find the handle to the monitoring client associated with the given
252 * @param client server's client handle to look up
253 * @return handle to the monitoring client
255 static struct MonitoringClient *
256 lookup_monitoring_client (struct GNUNET_SERVER_Client *client)
258 struct MonitoringClient *mc;
260 mc = monitoring_clients_head;
263 if (mc->client == client)
272 * Setup a new monitoring client using the given server client handle and
275 * @param client server's client handle to create our internal handle for
276 * @param peer identity of the peer to monitor the addresses of,
277 * zero to monitor all neighrours.
278 * @return handle to the new monitoring client
280 static struct MonitoringClient *
281 setup_monitoring_client (struct GNUNET_SERVER_Client *client,
282 struct GNUNET_PeerIdentity *peer)
284 struct MonitoringClient *mc;
285 static struct GNUNET_PeerIdentity all_zeros;
287 GNUNET_assert (lookup_monitoring_client (client) == NULL);
288 mc = GNUNET_malloc (sizeof (struct MonitoringClient));
291 GNUNET_CONTAINER_DLL_insert (monitoring_clients_head,
292 monitoring_clients_tail,
294 GNUNET_SERVER_notification_context_add (nc, client);
296 if (0 != memcmp (peer, &all_zeros, sizeof (struct GNUNET_PeerIdentity)))
297 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
298 "Client %p started monitoring of the peer `%s'\n",
299 mc, GNUNET_i2s (peer));
301 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
302 "Client %p started monitoring all peers\n", mc);
308 * Function called to notify a client about the socket being ready to
309 * queue more data. "buf" will be NULL and "size" zero if the socket
310 * was closed for writing in the meantime.
313 * @param size number of bytes available in buf
314 * @param buf where the callee should write the message
315 * @return number of bytes written to buf
318 transmit_to_client_callback (void *cls, size_t size, void *buf)
320 struct TransportClient *tc = cls;
321 struct ClientMessageQueueEntry *q;
322 const struct GNUNET_MessageHeader *msg;
330 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
331 "Transmission to client failed, closing connection.\n");
336 while (NULL != (q = tc->message_queue_head))
338 msg = (const struct GNUNET_MessageHeader *) &q[1];
339 msize = ntohs (msg->size);
340 if (msize + tsize > size)
342 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
343 "Transmitting message of type %u to client %p.\n",
344 ntohs (msg->type), tc);
345 GNUNET_CONTAINER_DLL_remove (tc->message_queue_head, tc->message_queue_tail,
348 memcpy (&cbuf[tsize], msg, msize);
354 GNUNET_assert (msize >= sizeof (struct GNUNET_MessageHeader));
356 GNUNET_SERVER_notify_transmit_ready (tc->client, msize,
357 GNUNET_TIME_UNIT_FOREVER_REL,
358 &transmit_to_client_callback, tc);
359 GNUNET_assert (tc->th != NULL);
366 * Queue the given message for transmission to the given client
368 * @param tc target of the message
369 * @param msg message to transmit
370 * @param may_drop GNUNET_YES if the message can be dropped
373 unicast (struct TransportClient *tc, const struct GNUNET_MessageHeader *msg,
376 struct ClientMessageQueueEntry *q;
385 if ((tc->message_count >= MAX_PENDING) && (GNUNET_YES == may_drop))
387 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
389 ("Dropping message of type %u and size %u, have %u/%u messages pending\n"),
390 ntohs (msg->type), ntohs (msg->size), tc->message_count,
392 GNUNET_STATISTICS_update (GST_stats,
394 ("# messages dropped due to slow client"), 1,
398 msize = ntohs (msg->size);
399 GNUNET_assert (msize >= sizeof (struct GNUNET_MessageHeader));
400 q = GNUNET_malloc (sizeof (struct ClientMessageQueueEntry) + msize);
401 memcpy (&q[1], msg, msize);
402 GNUNET_CONTAINER_DLL_insert_tail (tc->message_queue_head,
403 tc->message_queue_tail, q);
408 GNUNET_SERVER_notify_transmit_ready (tc->client, msize,
409 GNUNET_TIME_UNIT_FOREVER_REL,
410 &transmit_to_client_callback, tc);
411 GNUNET_assert (tc->th != NULL);
416 * Called whenever a client is disconnected. Frees our
417 * resources associated with that client.
420 * @param client identification of the client
423 client_disconnect_notification (void *cls, struct GNUNET_SERVER_Client *client)
425 struct TransportClient *tc;
426 struct MonitoringClient *mc;
427 struct ClientMessageQueueEntry *mqe;
431 mc = lookup_monitoring_client (client);
434 GNUNET_CONTAINER_DLL_remove (monitoring_clients_head,
435 monitoring_clients_tail,
439 tc = lookup_client (client);
442 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
443 "Client %p disconnected, cleaning up.\n", tc);
444 while (NULL != (mqe = tc->message_queue_head))
446 GNUNET_CONTAINER_DLL_remove (tc->message_queue_head, tc->message_queue_tail,
451 GNUNET_CONTAINER_DLL_remove (clients_head, clients_tail, tc);
454 GNUNET_SERVER_notify_transmit_ready_cancel (tc->th);
457 GNUNET_break (0 == tc->message_count);
463 * Function called for each of our connected neighbours. Notify the
464 * client about the existing neighbour.
466 * @param cls the 'struct TransportClient' to notify
467 * @param peer identity of the neighbour
468 * @param ats performance data
469 * @param ats_count number of entries in ats (excluding 0-termination)
470 * @param address the address
471 * @param bandwidth_in inbound bandwidth in NBO
472 * @param bandwidth_out outbound bandwidth in NBO
475 notify_client_about_neighbour (void *cls,
476 const struct GNUNET_PeerIdentity *peer,
477 const struct GNUNET_HELLO_Address *address,
478 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in,
479 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out)
481 struct TransportClient *tc = cls;
482 struct ConnectInfoMessage *cim;
483 size_t size = sizeof (struct ConnectInfoMessage);
484 char buf[size] GNUNET_ALIGN;
486 GNUNET_assert (size < GNUNET_SERVER_MAX_MESSAGE_SIZE);
487 cim = (struct ConnectInfoMessage *) buf;
488 cim->header.size = htons (size);
489 cim->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT);
491 cim->quota_in = bandwidth_in;
492 cim->quota_out = bandwidth_out;
493 unicast (tc, &cim->header, GNUNET_NO);
498 * Initialize a normal client. We got a start message from this
499 * client, add him to the list of clients for broadcasting of inbound
503 * @param client the client
504 * @param message the start message that was sent
507 clients_handle_start (void *cls, struct GNUNET_SERVER_Client *client,
508 const struct GNUNET_MessageHeader *message)
510 const struct StartMessage *start;
511 struct TransportClient *tc;
514 tc = lookup_client (client);
516 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
517 "Client %p sent START\n", tc);
520 /* got 'start' twice from the same client, not allowed */
521 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
522 "TransportClient %p ServerClient %p sent multiple START messages\n",
525 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
528 start = (const struct StartMessage *) message;
529 options = ntohl (start->options);
530 if ((0 != (1 & options)) &&
532 memcmp (&start->self, &GST_my_identity,
533 sizeof (struct GNUNET_PeerIdentity))))
535 /* client thinks this is a different peer, reject */
536 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
538 ("Rejecting control connection from peer `%s', which is not me!\n"),
539 GNUNET_i2s (&start->self));
540 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
543 tc = setup_client (client);
544 tc->send_payload = (0 != (2 & options));
545 unicast (tc, GST_hello_get (), GNUNET_NO);
546 GST_neighbours_iterate (¬ify_client_about_neighbour, tc);
547 GNUNET_CONTAINER_DLL_insert (clients_head, clients_tail, tc);
548 GNUNET_SERVER_receive_done (client, GNUNET_OK);
553 * Client sent us a HELLO. Process the request.
556 * @param client the client
557 * @param message the HELLO message
560 clients_handle_hello (void *cls, struct GNUNET_SERVER_Client *client,
561 const struct GNUNET_MessageHeader *message)
563 GST_validation_handle_hello (message);
564 GNUNET_SERVER_receive_done (client, GNUNET_OK);
569 * Closure for 'handle_send_transmit_continuation'
571 struct SendTransmitContinuationContext
574 * Client that made the request.
576 struct GNUNET_SERVER_Client *client;
579 * Peer that was the target.
581 struct GNUNET_PeerIdentity target;
586 * Function called after the transmission is done. Notify the client that it is
587 * OK to send the next message.
590 * @param success GNUNET_OK on success, GNUNET_NO on failure, GNUNET_SYSERR if we're not connected
591 * @param bytes_payload bytes payload sent
592 * @param bytes_on_wire bytes sent on wire
595 handle_send_transmit_continuation (void *cls, int success,
596 size_t bytes_payload, size_t bytes_on_wire)
598 struct SendTransmitContinuationContext *stcc = cls;
599 struct SendOkMessage send_ok_msg;
601 //GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Payload: %u, On wire %u result: %i\n", bytes_payload, bytes_on_wire, success);
603 if (GNUNET_OK == success)
604 GNUNET_assert (bytes_on_wire >= bytes_payload);
607 GNUNET_assert (bytes_on_wire <= bytes_payload);
609 send_ok_msg.header.size = htons (sizeof (send_ok_msg));
610 send_ok_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SEND_OK);
611 send_ok_msg.bytes_msg = htonl (bytes_payload);
612 send_ok_msg.bytes_physical = htonl (bytes_on_wire);
613 send_ok_msg.success = htonl (success);
614 send_ok_msg.latency =
615 GNUNET_TIME_relative_hton (GNUNET_TIME_UNIT_FOREVER_REL);
616 send_ok_msg.peer = stcc->target;
617 GST_clients_unicast (stcc->client, &send_ok_msg.header, GNUNET_NO);
618 GNUNET_SERVER_client_drop (stcc->client);
624 * Client asked for transmission to a peer. Process the request.
627 * @param client the client
628 * @param message the send message that was sent
631 clients_handle_send (void *cls, struct GNUNET_SERVER_Client *client,
632 const struct GNUNET_MessageHeader *message)
634 const struct OutboundMessage *obm;
635 const struct GNUNET_MessageHeader *obmm;
636 struct SendTransmitContinuationContext *stcc;
639 struct TransportClient *tc;
641 tc = lookup_client (client);
644 /* client asked for transmission before 'START' */
646 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
650 size = ntohs (message->size);
652 sizeof (struct OutboundMessage) + sizeof (struct GNUNET_MessageHeader))
655 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
658 obm = (const struct OutboundMessage *) message;
659 obmm = (const struct GNUNET_MessageHeader *) &obm[1];
660 msize = size - sizeof (struct OutboundMessage);
661 if (msize < sizeof (struct GNUNET_MessageHeader))
664 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
668 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
669 "Received `%s' request from client with target `%4s' and first message of type %u and total size %u\n",
670 "SEND", GNUNET_i2s (&obm->peer), ntohs (obmm->type), msize);
671 if (GNUNET_NO == GST_neighbours_test_connected (&obm->peer))
673 /* not connected, not allowed to send; can happen due to asynchronous operations */
674 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
675 "Could not send message to peer `%s': not connected\n",
676 GNUNET_i2s (&obm->peer));
677 GNUNET_STATISTICS_update (GST_stats,
679 ("# bytes payload dropped (other peer was not connected)"),
681 GNUNET_SERVER_receive_done (client, GNUNET_OK);
684 GNUNET_SERVER_receive_done (client, GNUNET_OK);
685 stcc = GNUNET_malloc (sizeof (struct SendTransmitContinuationContext));
686 stcc->target = obm->peer;
687 stcc->client = client;
688 GNUNET_SERVER_client_keep (client);
689 GST_manipulation_send (&obm->peer, obmm, msize,
690 GNUNET_TIME_relative_ntoh (obm->timeout),
691 &handle_send_transmit_continuation, stcc);
696 * Try to initiate a connection to the given peer if the blacklist
699 * @param cls closure (unused, NULL)
700 * @param peer identity of peer that was tested
701 * @param result GNUNET_OK if the connection is allowed,
705 try_connect_if_allowed (void *cls, const struct GNUNET_PeerIdentity *peer,
708 if (GNUNET_OK != result)
709 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,
732 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
733 "Received a request connect message for peer `%s'\n",
734 GNUNET_i2s (&trcm->peer));
735 (void) GST_blacklist_test_allowed (&trcm->peer, NULL, &try_connect_if_allowed,
737 GNUNET_SERVER_receive_done (client, GNUNET_OK);
742 * Take the given address and append it to the set of results sent back to
745 * @param cls the transmission context used ('struct GNUNET_SERVER_TransmitContext*')
746 * @param buf text to transmit
749 transmit_address_to_client (void *cls, const char *buf)
751 struct AddressToStringContext *actx = cls;
754 GNUNET_SERVER_transmit_context_append_data (actx->tc, NULL, 0,
755 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_TO_STRING_REPLY);
756 GNUNET_SERVER_transmit_context_run (actx->tc, GNUNET_TIME_UNIT_FOREVER_REL);
757 GNUNET_CONTAINER_DLL_remove (a2s_head, a2s_tail, actx);
761 GNUNET_SERVER_transmit_context_append_data (actx->tc, buf, strlen (buf) + 1,
762 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_TO_STRING_REPLY);
767 * Client asked to resolve an address. Process the request.
770 * @param client the client
771 * @param message the resolution request
774 clients_handle_address_to_string (void *cls,
775 struct GNUNET_SERVER_Client *client,
776 const struct GNUNET_MessageHeader *message)
778 const struct AddressLookupMessage *alum;
779 struct GNUNET_TRANSPORT_PluginFunctions *papi;
780 const char *plugin_name;
782 uint32_t address_len;
784 struct GNUNET_SERVER_TransmitContext *tc;
785 struct AddressToStringContext *actx;
786 struct GNUNET_TIME_Relative rtimeout;
789 size = ntohs (message->size);
790 if (size < sizeof (struct AddressLookupMessage))
793 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
796 alum = (const struct AddressLookupMessage *) message;
797 address_len = ntohs (alum->addrlen);
798 if (size <= sizeof (struct AddressLookupMessage) + address_len)
801 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
804 address = (const char *) &alum[1];
805 plugin_name = (const char *) &address[address_len];
806 if (plugin_name[size - sizeof (struct AddressLookupMessage) - address_len - 1]
810 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
813 rtimeout = GNUNET_TIME_relative_ntoh (alum->timeout);
814 numeric = ntohs (alum->numeric_only);
815 tc = GNUNET_SERVER_transmit_context_create (client);
816 papi = GST_plugins_printer_find (plugin_name);
819 GNUNET_SERVER_transmit_context_append_data (tc, NULL, 0,
820 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_TO_STRING_REPLY);
821 GNUNET_SERVER_transmit_context_run (tc, rtimeout);
824 actx = GNUNET_malloc (sizeof (struct AddressToStringContext));
826 GNUNET_CONTAINER_DLL_insert (a2s_head, a2s_tail, actx);
827 GNUNET_SERVER_disable_receive_done_warning (client);
828 papi->address_pretty_printer (papi->cls, plugin_name, address, address_len,
829 numeric, rtimeout, &transmit_address_to_client,
835 * Compose AddressIterateResponseMessage using the given peer and address.
837 * @param peer identity of the peer
838 * @param address the address, NULL on disconnect
839 * @return composed message
841 static struct AddressIterateResponseMessage *
842 compose_address_iterate_response_message (const struct GNUNET_PeerIdentity
844 const struct GNUNET_HELLO_Address
847 struct AddressIterateResponseMessage *msg;
853 GNUNET_assert (NULL != peer);
856 tlen = strlen (address->transport_name) + 1;
857 alen = address->address_length;
861 size = (sizeof (struct AddressIterateResponseMessage) + alen + tlen);
862 msg = GNUNET_malloc (size);
863 msg->header.size = htons (size);
865 htons (GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_ITERATE_RESPONSE);
866 msg->reserved = htonl (0);
868 msg->addrlen = htonl (alen);
869 msg->pluginlen = htonl (tlen);
872 addr = (char *) &msg[1];
873 memcpy (addr, address->address, alen);
874 memcpy (&addr[alen], address->transport_name, tlen);
881 * Output the active address of connected neighbours to the given client.
883 * @param cls the 'struct GNUNET_SERVER_TransmitContext' for transmission to the client
884 * @param peer identity of the neighbour
885 * @param ats performance data
886 * @param ats_count number of entries in ats (excluding 0-termination)
887 * @param address the address
888 * @param bandwidth_in inbound quota in NBO
889 * @param bandwidth_out outbound quota in NBO
892 output_address (void *cls, const struct GNUNET_PeerIdentity *peer,
893 const struct GNUNET_HELLO_Address *address,
894 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in,
895 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out)
897 struct GNUNET_SERVER_TransmitContext *tc = cls;
898 struct AddressIterateResponseMessage *msg;
900 msg = compose_address_iterate_response_message (peer, address);
901 GNUNET_SERVER_transmit_context_append_message (tc, &msg->header);
907 * Client asked to obtain information about all actively used addresses
909 * Process the request.
912 * @param client the client
913 * @param message the peer address information request
916 clients_handle_address_iterate (void *cls, struct GNUNET_SERVER_Client *client,
917 const struct GNUNET_MessageHeader *message)
919 static struct GNUNET_PeerIdentity all_zeros;
920 struct GNUNET_SERVER_TransmitContext *tc;
921 struct AddressIterateMessage *msg;
922 struct GNUNET_HELLO_Address *address;
924 if (ntohs (message->type) != GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_ITERATE)
927 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
930 if (ntohs (message->size) != sizeof (struct AddressIterateMessage))
933 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
936 msg = (struct AddressIterateMessage *) message;
937 if ( (GNUNET_YES != ntohl (msg->one_shot)) &&
938 (NULL != lookup_monitoring_client (client)) )
940 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
941 "ServerClient %p tried to start monitoring twice\n",
944 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
947 GNUNET_SERVER_disable_receive_done_warning (client);
948 tc = GNUNET_SERVER_transmit_context_create (client);
949 if (0 == memcmp (&msg->peer, &all_zeros, sizeof (struct GNUNET_PeerIdentity)))
951 /* iterate over all neighbours */
952 GST_neighbours_iterate (&output_address, tc);
956 /* just return one neighbour */
957 address = GST_neighbour_get_current_address (&msg->peer);
959 output_address (tc, &msg->peer, address,
960 GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT,
961 GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT);
963 if (GNUNET_YES != ntohl (msg->one_shot))
964 setup_monitoring_client (client, &msg->peer);
966 GNUNET_SERVER_transmit_context_append_data (tc, NULL, 0,
967 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_ITERATE_RESPONSE);
968 GNUNET_SERVER_transmit_context_run (tc, GNUNET_TIME_UNIT_FOREVER_REL);
973 * Start handling requests from clients.
975 * @param server server used to accept clients from.
978 GST_clients_start (struct GNUNET_SERVER_Handle *server)
980 static const struct GNUNET_SERVER_MessageHandler handlers[] = {
981 {&clients_handle_start, NULL,
982 GNUNET_MESSAGE_TYPE_TRANSPORT_START, sizeof (struct StartMessage)},
983 {&clients_handle_hello, NULL,
984 GNUNET_MESSAGE_TYPE_HELLO, 0},
985 {&clients_handle_send, NULL,
986 GNUNET_MESSAGE_TYPE_TRANSPORT_SEND, 0},
987 {&clients_handle_request_connect, NULL,
988 GNUNET_MESSAGE_TYPE_TRANSPORT_REQUEST_CONNECT,
989 sizeof (struct TransportRequestConnectMessage)},
990 {&clients_handle_address_to_string, NULL,
991 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_TO_STRING, 0},
992 {&clients_handle_address_iterate, NULL,
993 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_ITERATE,
994 sizeof (struct AddressIterateMessage)},
995 {&GST_blacklist_handle_init, NULL,
996 GNUNET_MESSAGE_TYPE_TRANSPORT_BLACKLIST_INIT,
997 sizeof (struct GNUNET_MessageHeader)},
998 {&GST_blacklist_handle_reply, NULL,
999 GNUNET_MESSAGE_TYPE_TRANSPORT_BLACKLIST_REPLY,
1000 sizeof (struct BlacklistMessage)},
1001 {&GST_manipulation_set_metric, NULL,
1002 GNUNET_MESSAGE_TYPE_TRANSPORT_TRAFFIC_METRIC, 0},
1005 nc = GNUNET_SERVER_notification_context_create (server, 0);
1006 GNUNET_SERVER_add_handlers (server, handlers);
1007 GNUNET_SERVER_disconnect_notify (server, &client_disconnect_notification,
1013 * Stop processing clients.
1018 struct AddressToStringContext *cur;
1020 while (NULL != (cur = a2s_head))
1022 GNUNET_SERVER_transmit_context_destroy (cur->tc, GNUNET_NO);
1023 GNUNET_CONTAINER_DLL_remove (a2s_head, a2s_tail, cur);
1029 GNUNET_SERVER_notification_context_destroy (nc);
1035 * Broadcast the given message to all of our clients.
1037 * @param msg message to broadcast
1038 * @param may_drop GNUNET_YES if the message can be dropped / is payload
1041 GST_clients_broadcast (const struct GNUNET_MessageHeader *msg, int may_drop)
1043 struct TransportClient *tc;
1045 for (tc = clients_head; tc != NULL; tc = tc->next)
1047 if ((GNUNET_YES == may_drop) && (GNUNET_YES != tc->send_payload))
1048 continue; /* skip, this client does not care about payload */
1049 unicast (tc, msg, may_drop);
1055 * Send the given message to a particular client
1057 * @param client target of the message
1058 * @param msg message to transmit
1059 * @param may_drop GNUNET_YES if the message can be dropped
1062 GST_clients_unicast (struct GNUNET_SERVER_Client *client,
1063 const struct GNUNET_MessageHeader *msg, int may_drop)
1065 struct TransportClient *tc;
1067 tc = lookup_client (client);
1069 return; /* client got disconnected in the meantime, drop message */
1070 unicast (tc, msg, may_drop);
1075 * Broadcast the new active address to all clients monitoring the peer.
1077 * @param peer peer this update is about (never NULL)
1078 * @param address address, NULL on disconnect
1081 GST_clients_broadcast_address_notification (const struct GNUNET_PeerIdentity
1083 const struct GNUNET_HELLO_Address
1086 struct AddressIterateResponseMessage *msg;
1087 struct MonitoringClient *mc;
1088 static struct GNUNET_PeerIdentity all_zeros;
1089 msg = compose_address_iterate_response_message (peer, address);
1090 mc = monitoring_clients_head;
1093 if ((0 == memcmp (&mc->peer, &all_zeros,
1094 sizeof (struct GNUNET_PeerIdentity))) ||
1095 (0 == memcmp (&mc->peer, peer,
1096 sizeof (struct GNUNET_PeerIdentity))))
1098 GNUNET_SERVER_notification_context_unicast (nc, mc->client,
1099 &msg->header, GNUNET_NO);
1108 /* end of file gnunet-service-transport_clients.c */