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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;
116 * Head of linked list of all clients to this service.
118 static struct TransportClient *clients_head;
121 * Tail of linked list of all clients to this service.
123 static struct TransportClient *clients_tail;
127 * Find the internal handle associated with the given client handle
129 * @param client server's client handle to look up
130 * @return internal client handle
132 static struct TransportClient *
133 lookup_client (struct GNUNET_SERVER_Client *client)
135 struct TransportClient *tc;
140 if (tc->client == client)
149 * Create the internal handle for the given server client handle
151 * @param client server's client handle to create our internal handle for
152 * @return fresh internal client handle
154 static struct TransportClient *
155 setup_client (struct GNUNET_SERVER_Client *client)
157 struct TransportClient *tc;
159 tc = GNUNET_malloc (sizeof (struct TransportClient));
161 GNUNET_CONTAINER_DLL_insert (clients_head,
169 * Function called to notify a client about the socket being ready to
170 * queue more data. "buf" will be NULL and "size" zero if the socket
171 * was closed for writing in the meantime.
174 * @param size number of bytes available in buf
175 * @param buf where the callee should write the message
176 * @return number of bytes written to buf
179 transmit_to_client_callback (void *cls,
183 struct TransportClient *tc = cls;
184 struct ClientMessageQueueEntry *q;
185 const struct GNUNET_MessageHeader *msg;
194 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
195 "Transmission to client failed, closing connection.\n");
201 while (NULL != (q = tc->message_queue_head))
203 msg = (const struct GNUNET_MessageHeader *) &q[1];
204 msize = ntohs (msg->size);
205 if (msize + tsize > size)
208 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
209 "Transmitting message of type %u to client.\n",
212 GNUNET_CONTAINER_DLL_remove (tc->message_queue_head,
213 tc->message_queue_tail,
216 memcpy (&cbuf[tsize],
224 GNUNET_assert (msize >= sizeof (struct GNUNET_MessageHeader));
225 tc->th = GNUNET_SERVER_notify_transmit_ready (tc->client,
227 GNUNET_TIME_UNIT_FOREVER_REL,
228 &transmit_to_client_callback,
230 GNUNET_assert (tc->th != NULL);
237 * Queue the given message for transmission to the given client
239 * @param client 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,
245 const struct GNUNET_MessageHeader *msg,
248 struct ClientMessageQueueEntry *q;
251 if ( (tc->message_count >= MAX_PENDING) &&
252 (GNUNET_YES == may_drop) )
254 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
255 _("Dropping message of type %u and size %u, have %u/%u messages pending\n"),
260 GNUNET_STATISTICS_update (GST_stats,
261 gettext_noop ("# messages dropped due to slow client"),
266 msize = ntohs (msg->size);
267 GNUNET_assert (msize >= sizeof (struct GNUNET_MessageHeader));
268 q = GNUNET_malloc (sizeof (struct ClientMessageQueueEntry) + msize);
269 memcpy (&q[1], msg, msize);
270 GNUNET_CONTAINER_DLL_insert_tail (tc->message_queue_head,
271 tc->message_queue_tail,
276 tc->th = GNUNET_SERVER_notify_transmit_ready (tc->client,
278 GNUNET_TIME_UNIT_FOREVER_REL,
279 &transmit_to_client_callback,
281 GNUNET_assert (tc->th != NULL);
286 * Called whenever a client is disconnected. Frees our
287 * resources associated with that client.
290 * @param client identification of the client
293 client_disconnect_notification (void *cls,
294 struct GNUNET_SERVER_Client *client)
296 struct TransportClient *tc;
297 struct ClientMessageQueueEntry *mqe;
301 tc = lookup_client (client);
305 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
306 "Client disconnected, cleaning up.\n");
308 while (NULL != (mqe = tc->message_queue_head))
310 GNUNET_CONTAINER_DLL_remove (tc->message_queue_head,
311 tc->message_queue_tail,
316 GNUNET_CONTAINER_DLL_remove (clients_head,
321 GNUNET_CONNECTION_notify_transmit_ready_cancel (tc->th);
324 GNUNET_break (0 == tc->message_count);
330 * Function called for each of our connected neighbours. Notify the
331 * client about the existing neighbour.
333 * @param cls the 'struct TransportClient' to notify
334 * @param peer identity of the neighbour
335 * @param ats performance data
336 * @param ats_count number of entries in ats (excluding 0-termination)
339 notify_client_about_neighbour (void *cls,
340 const struct GNUNET_PeerIdentity *peer,
341 const struct GNUNET_TRANSPORT_ATS_Information *ats,
344 struct TransportClient *tc = cls;
345 struct ConnectInfoMessage *cim;
348 size = sizeof (struct ConnectInfoMessage) + ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
349 GNUNET_assert (size < GNUNET_SERVER_MAX_MESSAGE_SIZE);
350 cim = GNUNET_malloc (size);
351 cim->header.size = htons (size);
352 cim->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT);
353 cim->ats_count = htonl(ats_count);
357 ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information));
358 unicast (tc, &cim->header, GNUNET_NO);
364 * Initialize a normal client. We got a start message from this
365 * client, add him to the list of clients for broadcasting of inbound
369 * @param client the client
370 * @param message the start message that was sent
373 clients_handle_start (void *cls,
374 struct GNUNET_SERVER_Client *client,
375 const struct GNUNET_MessageHeader *message)
377 const struct StartMessage *start;
378 struct TransportClient *tc;
380 tc = lookup_client (client);
383 /* got 'start' twice from the same client, not allowed */
385 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
388 start = (const struct StartMessage*) message;
389 if ( (GNUNET_NO != ntohl (start->do_check)) &&
390 (0 != memcmp (&start->self,
392 sizeof (struct GNUNET_PeerIdentity))) )
394 /* client thinks this is a different peer, reject */
395 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
396 _("Rejecting control connection from peer `%s', which is not me!\n"),
397 GNUNET_i2s (&start->self));
398 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
401 tc = setup_client (client);
402 unicast (tc, GST_hello_get(), GNUNET_NO);
403 GST_neighbours_iterate (¬ify_client_about_neighbour, tc);
404 GNUNET_SERVER_receive_done (client, GNUNET_OK);
409 * Client sent us a HELLO. Process the request.
412 * @param client the client
413 * @param message the HELLO message
416 clients_handle_hello (void *cls,
417 struct GNUNET_SERVER_Client *client,
418 const struct GNUNET_MessageHeader *message)
420 GST_validation_handle_hello (message);
421 GNUNET_SERVER_receive_done (client, GNUNET_OK);
426 * Closure for 'handle_send_transmit_continuation'
428 struct SendTransmitContinuationContext
431 * Client that made the request.
433 struct GNUNET_SERVER_Client *client;
436 * Peer that was the target.
438 struct GNUNET_PeerIdentity target;
443 * Function called after the transmission is done. Notify the client that it is
444 * OK to send the next message.
447 * @param success GNUNET_OK on success, GNUNET_NO on failure, GNUNET_SYSERR if we're not connected
450 handle_send_transmit_continuation (void *cls,
453 struct SendTransmitContinuationContext *stcc = cls;
454 struct SendOkMessage send_ok_msg;
456 send_ok_msg.header.size = htons (sizeof (send_ok_msg));
457 send_ok_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SEND_OK);
458 send_ok_msg.success = htonl (success);
459 send_ok_msg.latency = GNUNET_TIME_relative_hton (GNUNET_TIME_UNIT_FOREVER_REL);
460 send_ok_msg.peer = stcc->target;
461 GST_clients_unicast (stcc->client, &send_ok_msg.header, GNUNET_NO);
462 GNUNET_SERVER_client_drop (stcc->client);
468 * Client asked for transmission to a peer. Process the request.
471 * @param client the client
472 * @param message the send message that was sent
475 clients_handle_send (void *cls,
476 struct GNUNET_SERVER_Client *client,
477 const struct GNUNET_MessageHeader *message)
479 const struct OutboundMessage *obm;
480 const struct GNUNET_MessageHeader *obmm;
481 struct SendTransmitContinuationContext *stcc;
485 size = ntohs (message->size);
486 if (size < sizeof (struct OutboundMessage) + sizeof (struct GNUNET_MessageHeader))
489 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
492 obm = (const struct OutboundMessage *) message;
493 obmm = (const struct GNUNET_MessageHeader *) &obm[1];
494 msize = size - sizeof (struct OutboundMessage);
495 if (msize < sizeof (struct GNUNET_MessageHeader))
498 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
501 GNUNET_STATISTICS_update (GST_stats,
502 gettext_noop ("# bytes payload received for other peers"),
506 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
507 "Received `%s' request from client with target `%4s' and first message of type %u and total size %u\n",
509 GNUNET_i2s (&obm->peer),
514 GST_neighbours_test_connected (&obm->peer))
516 /* not connected, not allowed to send; can happen due to asynchronous operations */
517 GNUNET_STATISTICS_update (GST_stats,
518 gettext_noop ("# bytes payload dropped (other peer was not connected)"),
521 GNUNET_SERVER_receive_done (client, GNUNET_OK);
524 GNUNET_SERVER_receive_done (client, GNUNET_OK);
525 stcc = GNUNET_malloc (sizeof (struct SendTransmitContinuationContext));
526 stcc->target = obm->peer;
527 stcc->client = client;
528 GNUNET_SERVER_client_keep (client);
529 GST_neighbours_send (&obm->peer,
531 GNUNET_TIME_relative_ntoh (obm->timeout),
532 &handle_send_transmit_continuation,
538 * Try to initiate a connection to the given peer if the blacklist
541 * @param cls closure (unused, NULL)
542 * @param peer identity of peer that was tested
543 * @param result GNUNET_OK if the connection is allowed,
547 try_connect_if_allowed (void *cls,
548 const struct GNUNET_PeerIdentity *peer,
551 if (GNUNET_OK != result)
552 return; /* not allowed */
553 GST_neighbours_try_connect (peer);
558 * Handle request connect message
560 * @param cls closure (always NULL)
561 * @param client identification of the client
562 * @param message the actual message
565 clients_handle_request_connect (void *cls,
566 struct GNUNET_SERVER_Client *client,
567 const struct GNUNET_MessageHeader *message)
569 const struct TransportRequestConnectMessage *trcm =
570 (const struct TransportRequestConnectMessage *) message;
572 GNUNET_STATISTICS_update (GST_stats,
573 gettext_noop ("# REQUEST CONNECT messages received"),
577 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
578 "Received a request connect message for peer `%s'\n",
579 GNUNET_i2s(&trcm->peer));
581 (void) GST_blacklist_test_allowed (&trcm->peer, NULL,
582 &try_connect_if_allowed, NULL);
583 GNUNET_SERVER_receive_done (client, GNUNET_OK);
588 * Client asked for a quota change for a particular peer. Process the request.
591 * @param client the client
592 * @param message the quota changing message
595 clients_handle_set_quota (void *cls,
596 struct GNUNET_SERVER_Client *client,
597 const struct GNUNET_MessageHeader *message)
599 const struct QuotaSetMessage *qsm;
601 qsm = (const struct QuotaSetMessage *) message;
602 GNUNET_STATISTICS_update (GST_stats,
603 gettext_noop ("# SET QUOTA messages received"),
607 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
608 "Received `%s' request (new quota %u) from client for peer `%4s'\n",
610 (unsigned int) ntohl (qsm->quota.value__),
611 GNUNET_i2s (&qsm->peer));
613 GST_neighbours_set_incoming_quota (&qsm->peer,
615 GNUNET_SERVER_receive_done (client, GNUNET_OK);
620 * Take the given address and append it to the set of results sent back to
623 * @param cls the transmission context used ('struct GNUNET_SERVER_TransmitContext*')
624 * @param address the resolved name, NULL to indicate the last response
627 transmit_address_to_client (void *cls,
630 struct GNUNET_SERVER_TransmitContext *tc = cls;
634 GNUNET_SERVER_transmit_context_append_data (tc, NULL, 0,
635 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_REPLY);
636 GNUNET_SERVER_transmit_context_run (tc,
637 GNUNET_TIME_UNIT_FOREVER_REL);
640 GNUNET_SERVER_transmit_context_append_data (tc,
641 address, strlen (address) + 1,
642 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_REPLY);
647 * Client asked to resolve an address. Process the request.
650 * @param client the client
651 * @param message the resolution request
654 clients_handle_address_lookup (void *cls,
655 struct GNUNET_SERVER_Client *client,
656 const struct GNUNET_MessageHeader *message)
658 const struct AddressLookupMessage *alum;
659 struct GNUNET_TRANSPORT_PluginFunctions *papi;
660 const char *plugin_name;
662 uint32_t address_len;
664 struct GNUNET_SERVER_TransmitContext *tc;
665 struct GNUNET_TIME_Relative rtimeout;
668 size = ntohs (message->size);
669 if (size < sizeof (struct AddressLookupMessage))
672 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
675 alum = (const struct AddressLookupMessage *) message;
676 address_len = ntohl (alum->addrlen);
677 if (size <= sizeof (struct AddressLookupMessage) + address_len)
680 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
683 address = (const char *) &alum[1];
684 plugin_name = (const char *) &address[address_len];
686 [size - sizeof (struct AddressLookupMessage) - address_len - 1] != '\0')
689 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
692 rtimeout = GNUNET_TIME_relative_ntoh (alum->timeout);
693 numeric = ntohl (alum->numeric_only);
694 tc = GNUNET_SERVER_transmit_context_create (client);
695 papi = GST_plugins_find (plugin_name);
698 GNUNET_SERVER_transmit_context_append_data (tc, NULL, 0,
699 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_REPLY);
700 GNUNET_SERVER_transmit_context_run (tc, rtimeout);
703 GNUNET_SERVER_disable_receive_done_warning (client);
704 papi->address_pretty_printer (papi->cls,
706 address, address_len,
709 &transmit_address_to_client, tc);
714 * Send an address to the client.
716 * @param cls our 'struct GNUNET_SERVER_TransmitContext' (for sending)
717 * @param public_key public key for the peer, never NULL
718 * @param target peer this change is about, never NULL
719 * @param valid_until until what time do we consider the address valid?
720 * @param validation_block is FOREVER if the address is for an unsupported plugin (from PEERINFO)
721 * is ZERO if the address is considered valid (no validation needed)
722 * is a time in the future if we're currently denying re-validation
723 * @param plugin_name name of the plugin
724 * @param plugin_address binary address
725 * @param plugin_address_len length of address
728 send_address_to_client (void *cls,
729 const struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *public_key,
730 const struct GNUNET_PeerIdentity *target,
731 struct GNUNET_TIME_Absolute valid_until,
732 struct GNUNET_TIME_Absolute validation_block,
733 const char *plugin_name,
734 const void *plugin_address,
735 size_t plugin_address_len)
737 struct GNUNET_SERVER_TransmitContext *tc = cls;
740 /* FIXME: move to a binary format!!! */
741 GNUNET_asprintf (&addr_buf, "%s --- %s, %s",
742 GST_plugins_a2s (plugin_name,
745 (GNUNET_YES == GST_neighbours_test_connected (target))
748 (GNUNET_TIME_absolute_get_remaining (valid_until).rel_value > 0)
751 transmit_address_to_client (tc, addr_buf);
752 GNUNET_free (addr_buf);
757 * Client asked to obtain information about a peer's addresses.
758 * Process the request.
759 * FIXME: use better name!
762 * @param client the client
763 * @param message the peer address information request
766 clients_handle_peer_address_lookup (void *cls,
767 struct GNUNET_SERVER_Client *client,
768 const struct GNUNET_MessageHeader *message)
770 const struct PeerAddressLookupMessage *peer_address_lookup;
771 struct GNUNET_SERVER_TransmitContext *tc;
773 peer_address_lookup = (const struct PeerAddressLookupMessage *) message;
774 GNUNET_break (ntohl (peer_address_lookup->reserved) == 0);
775 tc = GNUNET_SERVER_transmit_context_create (client);
776 GST_validation_get_addresses (&peer_address_lookup->peer,
777 &send_address_to_client,
779 GNUNET_SERVER_transmit_context_append_data (tc,
781 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_REPLY);
782 GNUNET_SERVER_transmit_context_run (tc,
783 GNUNET_TIME_UNIT_FOREVER_REL);
788 * Output the active address of connected neighbours to the given client.
790 * @param cls the 'struct GNUNET_SERVER_TransmitContext' for transmission to the client
791 * @param neighbour identity of the neighbour
792 * @param ats performance data
793 * @param ats_count number of entries in ats (excluding 0-termination)
796 output_addresses (void *cls,
797 const struct GNUNET_PeerIdentity *neighbour,
798 const struct GNUNET_TRANSPORT_ATS_Information *ats,
801 struct GNUNET_SERVER_TransmitContext *tc = cls;
804 /* FIXME: move to a binary format!!! */
805 GNUNET_asprintf (&addr_buf,
807 GNUNET_i2s(neighbour),
808 GST_plugins_a2s ("FIXME", NULL, 0));
809 transmit_address_to_client (tc, addr_buf);
810 GNUNET_free (addr_buf);
815 * Client asked to obtain information about all actively used addresses.
816 * Process the request. FIXME: use better name!
819 * @param client the client
820 * @param message the peer address information request
823 clients_handle_address_iterate (void *cls,
824 struct GNUNET_SERVER_Client *client,
825 const struct GNUNET_MessageHeader *message)
827 struct GNUNET_SERVER_TransmitContext *tc;
829 GNUNET_SERVER_disable_receive_done_warning (client);
830 tc = GNUNET_SERVER_transmit_context_create (client);
831 GST_neighbours_iterate (&output_addresses,
833 GNUNET_SERVER_transmit_context_append_data (tc, NULL, 0,
834 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_REPLY);
835 GNUNET_SERVER_transmit_context_run (tc, GNUNET_TIME_UNIT_FOREVER_REL);
840 * Start handling requests from clients.
842 * @param server server used to accept clients from.
845 GST_clients_start (struct GNUNET_SERVER_Handle *server)
847 static const struct GNUNET_SERVER_MessageHandler handlers[] = {
848 { &clients_handle_start, NULL,
849 GNUNET_MESSAGE_TYPE_TRANSPORT_START, sizeof (struct StartMessage)},
850 { &clients_handle_hello, NULL,
851 GNUNET_MESSAGE_TYPE_HELLO, 0},
852 { &clients_handle_send, NULL,
853 GNUNET_MESSAGE_TYPE_TRANSPORT_SEND , 0},
854 { &clients_handle_request_connect, NULL,
855 GNUNET_MESSAGE_TYPE_TRANSPORT_REQUEST_CONNECT, sizeof (struct TransportRequestConnectMessage)},
856 { &clients_handle_set_quota, NULL,
857 GNUNET_MESSAGE_TYPE_TRANSPORT_SET_QUOTA, sizeof (struct QuotaSetMessage)},
858 { &clients_handle_address_lookup, NULL,
859 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_LOOKUP , 0},
860 { &clients_handle_peer_address_lookup, NULL,
861 GNUNET_MESSAGE_TYPE_TRANSPORT_PEER_ADDRESS_LOOKUP, sizeof (struct PeerAddressLookupMessage)},
862 { &clients_handle_address_iterate, NULL,
863 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_ITERATE, sizeof (struct GNUNET_MessageHeader)},
864 { &GST_blacklist_handle_init, NULL,
865 GNUNET_MESSAGE_TYPE_TRANSPORT_BLACKLIST_INIT, sizeof (struct GNUNET_MessageHeader)},
866 { &GST_blacklist_handle_reply, NULL,
867 GNUNET_MESSAGE_TYPE_TRANSPORT_BLACKLIST_REPLY, sizeof (struct BlacklistMessage)},
870 GNUNET_SERVER_add_handlers (server, handlers);
871 GNUNET_SERVER_disconnect_notify (server,
872 &client_disconnect_notification, NULL);
877 * Stop processing clients.
887 * Broadcast the given message to all of our clients.
889 * @param msg message to broadcast
890 * @param may_drop GNUNET_YES if the message can be dropped
893 GST_clients_broadcast (const struct GNUNET_MessageHeader *msg,
896 struct TransportClient *tc;
898 for (tc = clients_head; tc != NULL; tc = tc->next)
899 unicast (tc, msg, may_drop);
904 * Send the given message to a particular client
906 * @param client target of the message
907 * @param msg message to transmit
908 * @param may_drop GNUNET_YES if the message can be dropped
911 GST_clients_unicast (struct GNUNET_SERVER_Client *client,
912 const struct GNUNET_MessageHeader *msg,
915 struct TransportClient *tc;
917 tc = lookup_client (client);
919 tc = setup_client (client);
920 unicast (tc, msg, may_drop);
924 /* end of file gnunet-service-transport_clients.c */