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3 (C) 2010,2011 Christian Grothoff (and other contributing authors)
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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"
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_CONNECTION_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 * Head of linked list of all clients to this service.
122 static struct TransportClient *clients_head;
125 * Tail of linked list of all clients to this service.
127 static struct TransportClient *clients_tail;
130 * Find the internal handle associated with the given client handle
132 * @param client server's client handle to look up
133 * @return internal client handle
135 static struct TransportClient *
136 lookup_client (struct GNUNET_SERVER_Client *client)
138 struct TransportClient *tc;
143 if (tc->client == client)
152 * Create the internal handle for the given server client handle
154 * @param client server's client handle to create our internal handle for
155 * @return fresh internal client handle
157 static struct TransportClient *
158 setup_client (struct GNUNET_SERVER_Client *client)
160 struct TransportClient *tc;
162 GNUNET_assert (lookup_client (client) == NULL);
163 tc = GNUNET_malloc (sizeof (struct TransportClient));
165 GNUNET_CONTAINER_DLL_insert (clients_head, clients_tail, tc);
168 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Client %X connected\n", tc);
175 * Function called to notify a client about the socket being ready to
176 * queue more data. "buf" will be NULL and "size" zero if the socket
177 * was closed for writing in the meantime.
180 * @param size number of bytes available in buf
181 * @param buf where the callee should write the message
182 * @return number of bytes written to buf
185 transmit_to_client_callback (void *cls, size_t size, void *buf)
187 struct TransportClient *tc = cls;
188 struct ClientMessageQueueEntry *q;
189 const struct GNUNET_MessageHeader *msg;
198 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
199 "Transmission to client failed, closing connection.\n");
205 while (NULL != (q = tc->message_queue_head))
207 msg = (const struct GNUNET_MessageHeader *) &q[1];
208 msize = ntohs (msg->size);
209 if (msize + tsize > size)
212 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
213 "Transmitting message of type %u to client %X.\n",
214 ntohs (msg->type), tc);
216 GNUNET_CONTAINER_DLL_remove (tc->message_queue_head, tc->message_queue_tail,
219 memcpy (&cbuf[tsize], msg, msize);
225 GNUNET_assert (msize >= sizeof (struct GNUNET_MessageHeader));
227 GNUNET_SERVER_notify_transmit_ready (tc->client, msize,
228 GNUNET_TIME_UNIT_FOREVER_REL,
229 &transmit_to_client_callback, tc);
230 GNUNET_assert (tc->th != NULL);
237 * Queue the given message for transmission to the given client
239 * @param tc target of the message
240 * @param msg message to transmit
241 * @param may_drop GNUNET_YES if the message can be dropped
244 unicast (struct TransportClient *tc, const struct GNUNET_MessageHeader *msg,
247 struct ClientMessageQueueEntry *q;
250 if ((tc->message_count >= MAX_PENDING) && (GNUNET_YES == may_drop))
252 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
254 ("Dropping message of type %u and size %u, have %u/%u messages pending\n"),
255 ntohs (msg->type), ntohs (msg->size), tc->message_count,
257 GNUNET_STATISTICS_update (GST_stats,
259 ("# messages dropped due to slow client"), 1,
263 msize = ntohs (msg->size);
264 GNUNET_assert (msize >= sizeof (struct GNUNET_MessageHeader));
265 q = GNUNET_malloc (sizeof (struct ClientMessageQueueEntry) + msize);
266 memcpy (&q[1], msg, msize);
267 GNUNET_CONTAINER_DLL_insert_tail (tc->message_queue_head,
268 tc->message_queue_tail, q);
273 GNUNET_SERVER_notify_transmit_ready (tc->client, msize,
274 GNUNET_TIME_UNIT_FOREVER_REL,
275 &transmit_to_client_callback, tc);
276 GNUNET_assert (tc->th != NULL);
281 * Called whenever a client is disconnected. Frees our
282 * resources associated with that client.
285 * @param client identification of the client
288 client_disconnect_notification (void *cls, struct GNUNET_SERVER_Client *client)
290 struct TransportClient *tc;
291 struct ClientMessageQueueEntry *mqe;
295 tc = lookup_client (client);
299 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
300 "Client %X disconnected, cleaning up.\n", tc);
302 while (NULL != (mqe = tc->message_queue_head))
304 GNUNET_CONTAINER_DLL_remove (tc->message_queue_head, tc->message_queue_tail,
309 GNUNET_CONTAINER_DLL_remove (clients_head, clients_tail, tc);
312 GNUNET_CONNECTION_notify_transmit_ready_cancel (tc->th);
315 GNUNET_break (0 == tc->message_count);
321 * Function called for each of our connected neighbours. Notify the
322 * client about the existing neighbour.
324 * @param cls the 'struct TransportClient' to notify
325 * @param peer identity of the neighbour
326 * @param ats performance data
327 * @param ats_count number of entries in ats (excluding 0-termination)
328 * @param address the address
331 notify_client_about_neighbour (void *cls,
332 const struct GNUNET_PeerIdentity *peer,
333 const struct GNUNET_ATS_Information *ats,
335 const struct GNUNET_HELLO_Address *address)
337 struct TransportClient *tc = cls;
338 struct ConnectInfoMessage *cim;
339 struct GNUNET_ATS_Information *ap;
341 sizeof (struct ConnectInfoMessage) +
342 ats_count * sizeof (struct GNUNET_ATS_Information);
345 GNUNET_assert (size < GNUNET_SERVER_MAX_MESSAGE_SIZE);
346 cim = (struct ConnectInfoMessage *) buf;
347 cim->header.size = htons (size);
348 cim->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT);
349 cim->ats_count = htonl (ats_count);
351 ap = (struct GNUNET_ATS_Information *) &cim[1];
352 memcpy (ap, ats, ats_count * sizeof (struct GNUNET_ATS_Information));
353 unicast (tc, &cim->header, GNUNET_NO);
358 * Initialize a normal client. We got a start message from this
359 * client, add him to the list of clients for broadcasting of inbound
363 * @param client the client
364 * @param message the start message that was sent
367 clients_handle_start (void *cls, struct GNUNET_SERVER_Client *client,
368 const struct GNUNET_MessageHeader *message)
370 const struct StartMessage *start;
371 struct TransportClient *tc;
374 tc = lookup_client (client);
378 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
379 "Client %X sent START\n", tc);
381 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
382 "Client %X sent START\n", tc);
386 /* got 'start' twice from the same client, not allowed */
388 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
389 "TransportClient %X ServerClient %X sent multiple START messages\n",
393 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
396 start = (const struct StartMessage *) message;
397 options = ntohl (start->options);
398 if ((0 != (1 & options)) &&
400 memcmp (&start->self, &GST_my_identity,
401 sizeof (struct GNUNET_PeerIdentity))))
403 /* client thinks this is a different peer, reject */
404 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
406 ("Rejecting control connection from peer `%s', which is not me!\n"),
407 GNUNET_i2s (&start->self));
408 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
411 tc = setup_client (client);
412 tc->send_payload = (0 != (2 & options));
413 unicast (tc, GST_hello_get (), GNUNET_NO);
414 GST_neighbours_iterate (¬ify_client_about_neighbour, tc);
415 GNUNET_SERVER_receive_done (client, GNUNET_OK);
420 * Client sent us a HELLO. Process the request.
423 * @param client the client
424 * @param message the HELLO message
427 clients_handle_hello (void *cls, struct GNUNET_SERVER_Client *client,
428 const struct GNUNET_MessageHeader *message)
430 GST_validation_handle_hello (message);
431 GNUNET_SERVER_receive_done (client, GNUNET_OK);
436 * Closure for 'handle_send_transmit_continuation'
438 struct SendTransmitContinuationContext
441 * Client that made the request.
443 struct GNUNET_SERVER_Client *client;
446 * Peer that was the target.
448 struct GNUNET_PeerIdentity target;
453 * Function called after the transmission is done. Notify the client that it is
454 * OK to send the next message.
457 * @param success GNUNET_OK on success, GNUNET_NO on failure, GNUNET_SYSERR if we're not connected
460 handle_send_transmit_continuation (void *cls, int success)
462 struct SendTransmitContinuationContext *stcc = cls;
463 struct SendOkMessage send_ok_msg;
465 send_ok_msg.header.size = htons (sizeof (send_ok_msg));
466 send_ok_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SEND_OK);
467 send_ok_msg.success = htonl (success);
468 send_ok_msg.latency =
469 GNUNET_TIME_relative_hton (GNUNET_TIME_UNIT_FOREVER_REL);
470 send_ok_msg.peer = stcc->target;
471 GST_clients_unicast (stcc->client, &send_ok_msg.header, GNUNET_NO);
472 GNUNET_SERVER_client_drop (stcc->client);
478 * Client asked for transmission to a peer. Process the request.
481 * @param client the client
482 * @param message the send message that was sent
485 clients_handle_send (void *cls, struct GNUNET_SERVER_Client *client,
486 const struct GNUNET_MessageHeader *message)
488 const struct OutboundMessage *obm;
489 const struct GNUNET_MessageHeader *obmm;
490 struct SendTransmitContinuationContext *stcc;
493 struct TransportClient *tc;
495 tc = lookup_client (client);
498 /* client asked for transmission before 'START' */
500 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
504 size = ntohs (message->size);
506 sizeof (struct OutboundMessage) + sizeof (struct GNUNET_MessageHeader))
509 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
512 obm = (const struct OutboundMessage *) message;
513 obmm = (const struct GNUNET_MessageHeader *) &obm[1];
514 msize = size - sizeof (struct OutboundMessage);
515 if (msize < sizeof (struct GNUNET_MessageHeader))
518 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
521 GNUNET_STATISTICS_update (GST_stats,
523 ("# bytes payload received for other peers"), msize,
526 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
527 "Received `%s' request from client with target `%4s' and first message of type %u and total size %u\n",
528 "SEND", GNUNET_i2s (&obm->peer), ntohs (obmm->type), msize);
530 if (GNUNET_NO == GST_neighbours_test_connected (&obm->peer))
532 /* not connected, not allowed to send; can happen due to asynchronous operations */
534 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
535 "Could not send message to peer `%s': not connected\n",
536 GNUNET_i2s (&obm->peer));
538 GNUNET_STATISTICS_update (GST_stats,
540 ("# bytes payload dropped (other peer was not connected)"),
542 GNUNET_SERVER_receive_done (client, GNUNET_OK);
545 GNUNET_SERVER_receive_done (client, GNUNET_OK);
546 stcc = GNUNET_malloc (sizeof (struct SendTransmitContinuationContext));
547 stcc->target = obm->peer;
548 stcc->client = client;
549 GNUNET_SERVER_client_keep (client);
550 GST_neighbours_send (&obm->peer, obmm, msize,
551 GNUNET_TIME_relative_ntoh (obm->timeout),
552 &handle_send_transmit_continuation, stcc);
557 * Try to initiate a connection to the given peer if the blacklist
560 * @param cls closure (unused, NULL)
561 * @param peer identity of peer that was tested
562 * @param result GNUNET_OK if the connection is allowed,
566 try_connect_if_allowed (void *cls, const struct GNUNET_PeerIdentity *peer,
569 if (GNUNET_OK != result)
570 return; /* not allowed */
571 GST_neighbours_try_connect (peer);
576 * Handle request connect message
578 * @param cls closure (always NULL)
579 * @param client identification of the client
580 * @param message the actual message
583 clients_handle_request_connect (void *cls, struct GNUNET_SERVER_Client *client,
584 const struct GNUNET_MessageHeader *message)
586 const struct TransportRequestConnectMessage *trcm =
587 (const struct TransportRequestConnectMessage *) message;
589 GNUNET_STATISTICS_update (GST_stats,
591 ("# REQUEST CONNECT messages received"), 1,
594 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
595 "Received a request connect message for peer `%s'\n",
596 GNUNET_i2s (&trcm->peer));
598 (void) GST_blacklist_test_allowed (&trcm->peer, NULL, &try_connect_if_allowed,
600 GNUNET_SERVER_receive_done (client, GNUNET_OK);
605 * Take the given address and append it to the set of results sent back to
608 * @param cls the transmission context used ('struct GNUNET_SERVER_TransmitContext*')
609 * @param buf text to transmit
612 transmit_address_to_client (void *cls, const char *buf)
614 struct GNUNET_SERVER_TransmitContext *tc = cls;
618 GNUNET_SERVER_transmit_context_append_data (tc, NULL, 0,
619 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_TO_STRING_REPLY);
620 GNUNET_SERVER_transmit_context_run (tc, GNUNET_TIME_UNIT_FOREVER_REL);
623 GNUNET_SERVER_transmit_context_append_data (tc, buf, strlen (buf) + 1,
624 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_TO_STRING_REPLY);
629 * Client asked to resolve an address. Process the request.
632 * @param client the client
633 * @param message the resolution request
636 clients_handle_address_to_string (void *cls,
637 struct GNUNET_SERVER_Client *client,
638 const struct GNUNET_MessageHeader *message)
640 const struct AddressLookupMessage *alum;
641 struct GNUNET_TRANSPORT_PluginFunctions *papi;
642 const char *plugin_name;
644 uint32_t address_len;
646 struct GNUNET_SERVER_TransmitContext *tc;
647 struct GNUNET_TIME_Relative rtimeout;
650 size = ntohs (message->size);
651 if (size < sizeof (struct AddressLookupMessage))
654 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
657 alum = (const struct AddressLookupMessage *) message;
658 address_len = ntohs (alum->addrlen);
659 if (size <= sizeof (struct AddressLookupMessage) + address_len)
662 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
665 address = (const char *) &alum[1];
666 plugin_name = (const char *) &address[address_len];
667 if (plugin_name[size - sizeof (struct AddressLookupMessage) - address_len - 1]
671 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
674 rtimeout = GNUNET_TIME_relative_ntoh (alum->timeout);
675 numeric = ntohs (alum->numeric_only);
676 tc = GNUNET_SERVER_transmit_context_create (client);
677 papi = GST_plugins_find (plugin_name);
680 GNUNET_SERVER_transmit_context_append_data (tc, NULL, 0,
681 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_TO_STRING_REPLY);
682 GNUNET_SERVER_transmit_context_run (tc, rtimeout);
685 GNUNET_SERVER_disable_receive_done_warning (client);
686 papi->address_pretty_printer (papi->cls, plugin_name, address, address_len,
687 numeric, rtimeout, &transmit_address_to_client,
693 * Output the active address of connected neighbours to the given client.
695 * @param cls the 'struct GNUNET_SERVER_TransmitContext' for transmission to the client
696 * @param peer identity of the neighbour
697 * @param ats performance data
698 * @param ats_count number of entries in ats (excluding 0-termination)
699 * @param address the address
702 output_address (void *cls, const struct GNUNET_PeerIdentity *peer,
703 const struct GNUNET_ATS_Information *ats, uint32_t ats_count,
704 const struct GNUNET_HELLO_Address *address)
706 struct GNUNET_SERVER_TransmitContext *tc = cls;
707 struct AddressIterateResponseMessage *msg;
713 tlen = strlen (address->transport_name) + 1;
714 alen = address->address_length;
715 size = (sizeof (struct AddressIterateResponseMessage) + alen + tlen);
719 msg = (struct AddressIterateResponseMessage *) buf;
720 msg->reserved = htonl (0);
722 msg->addrlen = htonl (alen);
723 msg->pluginlen = htonl (tlen);
724 addr = (char *) &msg[1];
725 memcpy (addr, address->address, alen);
726 memcpy (&addr[alen], address->transport_name, tlen);
727 GNUNET_SERVER_transmit_context_append_data (tc,
730 GNUNET_MessageHeader)],
733 GNUNET_MessageHeader),
734 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_ITERATE_RESPONSE);
740 * Client asked to obtain information about all actively used addresses
742 * Process the request.
745 * @param client the client
746 * @param message the peer address information request
749 clients_handle_address_iterate (void *cls, struct GNUNET_SERVER_Client *client,
750 const struct GNUNET_MessageHeader *message)
752 static struct GNUNET_PeerIdentity all_zeros;
753 struct GNUNET_SERVER_TransmitContext *tc;
754 struct AddressIterateMessage *msg;
755 struct GNUNET_HELLO_Address *address;
757 if (ntohs (message->type) != GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_ITERATE)
760 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
763 if (ntohs (message->size) != sizeof (struct AddressIterateMessage))
766 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
769 msg = (struct AddressIterateMessage *) message;
770 if (GNUNET_YES != ntohl (msg->one_shot))
772 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
773 "Address monitoring not implemented\n");
774 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
777 GNUNET_SERVER_disable_receive_done_warning (client);
778 tc = GNUNET_SERVER_transmit_context_create (client);
779 if (0 == memcmp (&msg->peer, &all_zeros, sizeof (struct GNUNET_PeerIdentity)))
781 /* iterate over all neighbours */
782 GST_neighbours_iterate (&output_address, tc);
786 /* just return one neighbour */
787 address = GST_neighbour_get_current_address (&msg->peer);
789 output_address (tc, &msg->peer, NULL, 0, address);
791 GNUNET_SERVER_transmit_context_append_data (tc, NULL, 0,
792 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_ITERATE_RESPONSE);
793 GNUNET_SERVER_transmit_context_run (tc, GNUNET_TIME_UNIT_FOREVER_REL);
798 * Start handling requests from clients.
800 * @param server server used to accept clients from.
803 GST_clients_start (struct GNUNET_SERVER_Handle *server)
805 static const struct GNUNET_SERVER_MessageHandler handlers[] = {
806 {&clients_handle_start, NULL,
807 GNUNET_MESSAGE_TYPE_TRANSPORT_START, sizeof (struct StartMessage)},
808 {&clients_handle_hello, NULL,
809 GNUNET_MESSAGE_TYPE_HELLO, 0},
810 {&clients_handle_send, NULL,
811 GNUNET_MESSAGE_TYPE_TRANSPORT_SEND, 0},
812 {&clients_handle_request_connect, NULL,
813 GNUNET_MESSAGE_TYPE_TRANSPORT_REQUEST_CONNECT,
814 sizeof (struct TransportRequestConnectMessage)},
815 {&clients_handle_address_to_string, NULL,
816 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_TO_STRING, 0},
817 {&clients_handle_address_iterate, NULL,
818 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_ITERATE,
819 sizeof (struct AddressIterateMessage)},
820 {&GST_blacklist_handle_init, NULL,
821 GNUNET_MESSAGE_TYPE_TRANSPORT_BLACKLIST_INIT,
822 sizeof (struct GNUNET_MessageHeader)},
823 {&GST_blacklist_handle_reply, NULL,
824 GNUNET_MESSAGE_TYPE_TRANSPORT_BLACKLIST_REPLY,
825 sizeof (struct BlacklistMessage)},
828 GNUNET_SERVER_add_handlers (server, handlers);
829 GNUNET_SERVER_disconnect_notify (server, &client_disconnect_notification,
835 * Stop processing clients.
845 * Broadcast the given message to all of our clients.
847 * @param msg message to broadcast
848 * @param may_drop GNUNET_YES if the message can be dropped / is payload
851 GST_clients_broadcast (const struct GNUNET_MessageHeader *msg, int may_drop)
853 struct TransportClient *tc;
855 for (tc = clients_head; tc != NULL; tc = tc->next)
857 if ((GNUNET_YES == may_drop) && (GNUNET_YES != tc->send_payload))
858 continue; /* skip, this client does not care about payload */
859 unicast (tc, msg, may_drop);
865 * Send the given message to a particular client
867 * @param client target of the message
868 * @param msg message to transmit
869 * @param may_drop GNUNET_YES if the message can be dropped
872 GST_clients_unicast (struct GNUNET_SERVER_Client *client,
873 const struct GNUNET_MessageHeader *msg, int may_drop)
875 struct TransportClient *tc;
877 tc = lookup_client (client);
879 return; /* client got disconnected in the meantime, drop message */
880 unicast (tc, msg, may_drop);
884 /* end of file gnunet-service-transport_clients.c */