2 This file is part of GNUnet.
3 Copyright (C) 2010-2015 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
8 option) any later version.
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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.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18 Boston, MA 02110-1301, USA.
22 * @file transport/gnunet-service-transport_clients.c
23 * @brief communication with clients (core service and monitors)
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?
122 * Context for address to string operations
124 struct AddressToStringContext
127 * This is a doubly-linked list.
129 struct AddressToStringContext *next;
132 * This is a doubly-linked list.
134 struct AddressToStringContext *prev;
137 * Transmission context
139 struct GNUNET_SERVER_TransmitContext* tc;
144 * Client monitoring changes of active addresses or validations
145 * of our neighbours. Which type is being monitored depends on the
146 * DLL this struct is in.
148 struct MonitoringClient
151 * This is a doubly-linked list.
153 struct MonitoringClient *next;
156 * This is a doubly-linked list.
158 struct MonitoringClient *prev;
161 * Handle to the client.
163 struct GNUNET_SERVER_Client *client;
166 * Peer identity to monitor the addresses of.
167 * Zero to monitor all neighrours.
169 struct GNUNET_PeerIdentity peer;
175 * Head of linked list of all clients to this service.
177 static struct TransportClient *clients_head;
180 * Tail of linked list of all clients to this service.
182 static struct TransportClient *clients_tail;
185 * Head of linked list of all pending address iterations
187 static struct AddressToStringContext *a2s_head;
190 * Tail of linked list of all pending address iterations
192 static struct AddressToStringContext *a2s_tail;
195 * Head of linked list of monitoring clients.
197 static struct MonitoringClient *peer_monitoring_clients_head;
200 * Tail of linked list of monitoring clients.
202 static struct MonitoringClient *peer_monitoring_clients_tail;
205 * Head of linked list of validation monitoring clients.
207 static struct MonitoringClient *val_monitoring_clients_head;
210 * Tail of linked list of validation monitoring clients.
212 static struct MonitoringClient *val_monitoring_clients_tail;
215 * Notification context, to send updates on changes to active addresses
218 static struct GNUNET_SERVER_NotificationContext *peer_nc;
221 * Notification context, to send updates on changes to active addresses
224 static struct GNUNET_SERVER_NotificationContext *val_nc;
227 * Notification context, to send updates on changes to active plugin
230 static struct GNUNET_SERVER_NotificationContext *plugin_nc;
233 * Plugin monitoring client we are currently syncing, NULL if all
234 * monitoring clients are in sync.
236 static struct GNUNET_SERVER_Client *sync_client;
239 * Peer identity that is all zeros, used as a way to indicate
240 * "all peers". Used for comparissons.
242 static struct GNUNET_PeerIdentity all_zeros;
246 * Find the internal handle associated with the given client handle.
248 * @param client server's client handle to look up
249 * @return internal client handle
251 static struct TransportClient *
252 lookup_client (struct GNUNET_SERVER_Client *client)
254 return GNUNET_SERVER_client_get_user_context (client,
255 struct TransportClient);
260 * Create the internal handle for the given server client handle.
262 * @param client server's client handle to create our internal handle for
263 * @return fresh internal client handle
265 static struct TransportClient *
266 setup_client (struct GNUNET_SERVER_Client *client)
268 struct TransportClient *tc;
270 GNUNET_assert (NULL == lookup_client (client));
271 tc = GNUNET_new (struct TransportClient);
273 GNUNET_SERVER_client_set_user_context (client, tc);
274 GNUNET_CONTAINER_DLL_insert (clients_head,
277 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
278 "Client %p connected\n",
285 * Find the handle to the monitoring client associated with the given
288 * @param head the head of the client queue to look in
289 * @param client server's client handle to look up
290 * @return handle to the monitoring client
292 static struct MonitoringClient *
293 lookup_monitoring_client (struct MonitoringClient *head,
294 struct GNUNET_SERVER_Client *client)
296 struct MonitoringClient *mc;
298 for (mc = head; NULL != mc; mc = mc->next)
299 if (mc->client == client)
306 * Setup a new monitoring client using the given server client handle and
309 * @param client server's client handle to create our internal handle for
310 * @param peer identity of the peer to monitor the addresses of,
311 * zero to monitor all neighrours.
312 * @return handle to the new monitoring client
314 static struct MonitoringClient *
315 setup_peer_monitoring_client (struct GNUNET_SERVER_Client *client,
316 const struct GNUNET_PeerIdentity *peer)
318 struct MonitoringClient *mc;
320 GNUNET_assert (NULL ==
321 lookup_monitoring_client (peer_monitoring_clients_head,
323 mc = GNUNET_new (struct MonitoringClient);
326 GNUNET_CONTAINER_DLL_insert (peer_monitoring_clients_head,
327 peer_monitoring_clients_tail,
329 GNUNET_SERVER_client_mark_monitor (client);
330 GNUNET_SERVER_notification_context_add (peer_nc,
332 if (0 != memcmp (peer,
334 sizeof (struct GNUNET_PeerIdentity)))
335 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
336 "Client %p started monitoring of the peer `%s'\n",
340 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
341 "Client %p started monitoring all peers\n",
348 * Setup a new monitoring client using the given server client handle and
351 * @param client server's client handle to create our internal handle for
352 * @param peer identity of the peer to monitor the addresses of,
353 * zero to monitor all neighrours.
354 * @return handle to the new monitoring client
356 static struct MonitoringClient *
357 setup_val_monitoring_client (struct GNUNET_SERVER_Client *client,
358 struct GNUNET_PeerIdentity *peer)
360 struct MonitoringClient *mc;
362 GNUNET_assert (NULL ==
363 lookup_monitoring_client (val_monitoring_clients_head,
365 mc = GNUNET_new (struct MonitoringClient);
368 GNUNET_CONTAINER_DLL_insert (val_monitoring_clients_head,
369 val_monitoring_clients_tail,
371 GNUNET_SERVER_notification_context_add (val_nc, client);
373 if (0 != memcmp (peer,
375 sizeof (struct GNUNET_PeerIdentity)))
376 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
377 "Client %p started monitoring of the peer `%s'\n",
381 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
382 "Client %p started monitoring all peers\n",
389 * Function called to notify a client about the socket being ready to
390 * queue more data. @a buf will be NULL and @a size zero if the socket
391 * was closed for writing in the meantime.
394 * @param size number of bytes available in @a buf
395 * @param buf where the callee should write the message
396 * @return number of bytes written to @a buf
399 transmit_to_client_callback (void *cls,
403 struct TransportClient *tc = cls;
404 struct ClientMessageQueueEntry *q;
405 const struct GNUNET_MessageHeader *msg;
413 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
414 "Transmission to client failed, closing connection.\n");
419 while (NULL != (q = tc->message_queue_head))
421 msg = (const struct GNUNET_MessageHeader *) &q[1];
422 msize = ntohs (msg->size);
423 if (msize + tsize > size)
425 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
426 "Transmitting message of type %u to client %p.\n",
429 GNUNET_CONTAINER_DLL_remove (tc->message_queue_head,
430 tc->message_queue_tail,
433 memcpy (&cbuf[tsize], msg, msize);
439 GNUNET_assert (msize >= sizeof (struct GNUNET_MessageHeader));
441 GNUNET_SERVER_notify_transmit_ready (tc->client, msize,
442 GNUNET_TIME_UNIT_FOREVER_REL,
443 &transmit_to_client_callback, tc);
444 GNUNET_assert (NULL != tc->th);
451 * Queue the given message for transmission to the given client
453 * @param tc target of the message
454 * @param msg message to transmit
455 * @param may_drop #GNUNET_YES if the message can be dropped
458 unicast (struct TransportClient *tc,
459 const struct GNUNET_MessageHeader *msg,
462 struct ClientMessageQueueEntry *q;
470 if ( (tc->message_count >= MAX_PENDING) &&
471 (GNUNET_YES == may_drop) )
473 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
474 "Dropping message of type %u and size %u, have %u/%u messages pending\n",
479 GNUNET_STATISTICS_update (GST_stats,
481 ("# messages dropped due to slow client"), 1,
485 msize = ntohs (msg->size);
486 GNUNET_assert (msize >= sizeof (struct GNUNET_MessageHeader));
487 q = GNUNET_malloc (sizeof (struct ClientMessageQueueEntry) + msize);
488 memcpy (&q[1], msg, msize);
489 GNUNET_CONTAINER_DLL_insert_tail (tc->message_queue_head,
490 tc->message_queue_tail,
496 GNUNET_SERVER_notify_transmit_ready (tc->client, msize,
497 GNUNET_TIME_UNIT_FOREVER_REL,
498 &transmit_to_client_callback, tc);
499 GNUNET_assert (NULL != tc->th);
504 * Called whenever a client is disconnected. Frees our
505 * resources associated with that client.
507 * @param cls closure, NULL
508 * @param client identification of the client
511 client_disconnect_notification (void *cls,
512 struct GNUNET_SERVER_Client *client)
514 struct TransportClient *tc;
515 struct MonitoringClient *mc;
516 struct ClientMessageQueueEntry *mqe;
520 mc = lookup_monitoring_client (peer_monitoring_clients_head,
524 GNUNET_CONTAINER_DLL_remove (peer_monitoring_clients_head,
525 peer_monitoring_clients_tail,
529 mc = lookup_monitoring_client (val_monitoring_clients_head,
533 GNUNET_CONTAINER_DLL_remove (val_monitoring_clients_head,
534 val_monitoring_clients_tail,
538 tc = lookup_client (client);
541 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
542 "Client %p disconnected, cleaning up.\n",
544 while (NULL != (mqe = tc->message_queue_head))
546 GNUNET_CONTAINER_DLL_remove (tc->message_queue_head,
547 tc->message_queue_tail,
552 GNUNET_CONTAINER_DLL_remove (clients_head,
555 GNUNET_SERVER_client_set_user_context (client, NULL);
558 GNUNET_SERVER_notify_transmit_ready_cancel (tc->th);
561 GNUNET_break (0 == tc->message_count);
567 * Function called for each of our connected neighbours. Notify the
568 * client about the existing neighbour.
570 * @param cls the `struct TransportClient *` to notify
571 * @param peer identity of the neighbour
572 * @param address the address
573 * @param state the current state of the peer
574 * @param state_timeout the time out for the state
575 * @param bandwidth_in inbound bandwidth in NBO
576 * @param bandwidth_out outbound bandwidth in NBO
579 notify_client_about_neighbour (void *cls,
580 const struct GNUNET_PeerIdentity *peer,
581 const struct GNUNET_HELLO_Address *address,
582 enum GNUNET_TRANSPORT_PeerState state,
583 struct GNUNET_TIME_Absolute state_timeout,
584 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in,
585 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out)
587 struct TransportClient *tc = cls;
588 struct ConnectInfoMessage cim;
590 if (GNUNET_NO == GST_neighbours_test_connected (peer))
592 cim.header.size = htons (sizeof (struct ConnectInfoMessage));
593 cim.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT);
595 cim.quota_in = bandwidth_in;
596 cim.quota_out = bandwidth_out;
597 unicast (tc, &cim.header, GNUNET_NO);
602 * Initialize a normal client. We got a start message from this
603 * client, add him to the list of clients for broadcasting of inbound
607 * @param client the client
608 * @param message the start message that was sent
611 clients_handle_start (void *cls,
612 struct GNUNET_SERVER_Client *client,
613 const struct GNUNET_MessageHeader *message)
615 const struct StartMessage *start;
616 const struct GNUNET_MessageHeader *hello;
617 struct TransportClient *tc;
620 tc = lookup_client (client);
623 /* got 'start' twice from the same client, not allowed */
625 GNUNET_SERVER_receive_done (client,
629 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
630 "Client %p sent START\n",
632 start = (const struct StartMessage *) message;
633 options = ntohl (start->options);
634 if ((0 != (1 & options)) &&
636 memcmp (&start->self,
638 sizeof (struct GNUNET_PeerIdentity))))
640 /* client thinks this is a different peer, reject */
642 GNUNET_SERVER_receive_done (client,
646 tc = setup_client (client);
647 tc->send_payload = (0 != (2 & options));
648 hello = GST_hello_get ();
653 GST_neighbours_iterate (¬ify_client_about_neighbour,
655 GNUNET_SERVER_receive_done (client,
661 * Client sent us a HELLO. Process the request.
664 * @param client the client
665 * @param message the HELLO message
668 clients_handle_hello (void *cls,
669 struct GNUNET_SERVER_Client *client,
670 const struct GNUNET_MessageHeader *message)
672 GST_validation_handle_hello (message);
673 GNUNET_SERVER_receive_done (client, GNUNET_OK);
678 * Closure for #handle_send_transmit_continuation()
680 struct SendTransmitContinuationContext
683 * Client that made the request.
685 struct GNUNET_SERVER_Client *client;
688 * Peer that was the target.
690 struct GNUNET_PeerIdentity target;
695 * Function called after the transmission is done. Notify the client that it is
696 * OK to send the next message.
699 * @param success #GNUNET_OK on success, #GNUNET_NO on failure, #GNUNET_SYSERR if we're not connected
700 * @param bytes_payload bytes payload sent
701 * @param bytes_on_wire bytes sent on wire
704 handle_send_transmit_continuation (void *cls,
706 size_t bytes_payload,
707 size_t bytes_on_wire)
709 struct SendTransmitContinuationContext *stcc = cls;
710 struct SendOkMessage send_ok_msg;
712 if (GST_neighbours_test_connected (&stcc->target))
714 /* Only send confirmation if we are still connected */
715 send_ok_msg.header.size = htons (sizeof (send_ok_msg));
716 send_ok_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SEND_OK);
717 send_ok_msg.bytes_msg = htonl (bytes_payload);
718 send_ok_msg.bytes_physical = htonl (bytes_on_wire);
719 send_ok_msg.success = htonl (success);
720 send_ok_msg.peer = stcc->target;
721 GST_clients_unicast (stcc->client,
725 GNUNET_SERVER_client_drop (stcc->client);
731 * Client asked for transmission to a peer. Process the request.
734 * @param client the client
735 * @param message the send message that was sent
738 clients_handle_send (void *cls,
739 struct GNUNET_SERVER_Client *client,
740 const struct GNUNET_MessageHeader *message)
742 const struct OutboundMessage *obm;
743 const struct GNUNET_MessageHeader *obmm;
744 struct SendTransmitContinuationContext *stcc;
747 struct TransportClient *tc;
749 tc = lookup_client (client);
752 /* client asked for transmission before 'START' */
754 GNUNET_SERVER_receive_done (client,
759 size = ntohs (message->size);
761 sizeof (struct OutboundMessage) + sizeof (struct GNUNET_MessageHeader))
764 GNUNET_SERVER_receive_done (client,
768 obm = (const struct OutboundMessage *) message;
769 obmm = (const struct GNUNET_MessageHeader *) &obm[1];
770 msize = size - sizeof (struct OutboundMessage);
771 if (msize < sizeof (struct GNUNET_MessageHeader))
774 GNUNET_SERVER_receive_done (client,
779 if (GNUNET_NO == GST_neighbours_test_connected (&obm->peer))
781 /* not connected, not allowed to send; can happen due to asynchronous operations */
782 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
783 "Could not send message to peer `%s': not connected\n",
784 GNUNET_i2s (&obm->peer));
785 GNUNET_STATISTICS_update (GST_stats,
787 ("# bytes payload dropped (other peer was not connected)"),
789 GNUNET_SERVER_receive_done (client,
793 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
794 "Received SEND request for `%s' and first message of type %u and total size %u\n",
795 GNUNET_i2s (&obm->peer),
798 GNUNET_SERVER_receive_done (client,
800 stcc = GNUNET_new (struct SendTransmitContinuationContext);
801 stcc->target = obm->peer;
802 stcc->client = client;
803 GNUNET_SERVER_client_keep (client);
804 GST_manipulation_send (&obm->peer,
807 GNUNET_TIME_relative_ntoh (obm->timeout),
808 &handle_send_transmit_continuation,
814 * Handle request connect message
816 * @param cls closure (always NULL)
817 * @param client identification of the client
818 * @param message the actual message
821 clients_handle_request_connect (void *cls,
822 struct GNUNET_SERVER_Client *client,
823 const struct GNUNET_MessageHeader *message)
825 const struct TransportRequestConnectMessage *trcm;
827 trcm = (const struct TransportRequestConnectMessage *) message;
828 GNUNET_break (0 == ntohl (trcm->reserved));
829 GNUNET_STATISTICS_update (GST_stats,
831 ("# REQUEST CONNECT messages received"), 1,
833 if (0 == memcmp (&trcm->peer,
835 sizeof (struct GNUNET_PeerIdentity)))
838 GNUNET_SERVER_receive_done (client,
842 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
843 "Received a request connect message for peer `%s'\n",
844 GNUNET_i2s (&trcm->peer));
845 GST_neighbours_try_connect (&trcm->peer);
846 GNUNET_SERVER_receive_done (client, GNUNET_OK);
851 * Handle request disconnect message
853 * @param cls closure (always NULL)
854 * @param client identification of the client
855 * @param message the actual message
858 clients_handle_request_disconnect (void *cls,
859 struct GNUNET_SERVER_Client *client,
860 const struct GNUNET_MessageHeader *message)
862 const struct TransportRequestDisconnectMessage *trdm;
864 trdm = (const struct TransportRequestDisconnectMessage *) message;
865 GNUNET_break (0 == ntohl (trdm->reserved));
866 GNUNET_STATISTICS_update (GST_stats,
868 ("# REQUEST DISCONNECT messages received"), 1,
870 if (0 == memcmp (&trdm->peer,
872 sizeof (struct GNUNET_PeerIdentity)))
875 GNUNET_SERVER_receive_done (client, GNUNET_OK);
878 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
879 "Received a request disconnect message for peer `%s'\n",
880 GNUNET_i2s (&trdm->peer));
881 (void) GST_neighbours_force_disconnect (&trdm->peer);
882 GNUNET_SERVER_receive_done (client, GNUNET_OK);
887 * Take the given address and append it to the set of results sent back to
888 * the client. This function may be called serveral times for a single
889 * conversion. The last invocation will be with a @a address of
890 * NULL and a @a res of #GNUNET_OK. Thus, to indicate conversion
891 * errors, the callback might be called first with @a address NULL and
892 * @a res being #GNUNET_SYSERR. In that case, there will still be a
893 * subsequent call later with @a address NULL and @a res #GNUNET_OK.
895 * @param cls the transmission context used (`struct GNUNET_SERVER_TransmitContext *`)
896 * @param buf text to transmit (contains the human-readable address, or NULL)
897 * @param res #GNUNET_OK if conversion was successful, #GNUNET_SYSERR on error,
901 transmit_address_to_client (void *cls,
905 struct AddressToStringContext *actx = cls;
906 struct AddressToStringResultMessage *atsm;
910 GNUNET_assert ( (GNUNET_OK == res) ||
911 (GNUNET_SYSERR == res) );
914 len = sizeof (struct AddressToStringResultMessage);
915 atsm = GNUNET_malloc (len);
916 atsm->header.size = ntohs (len);
917 atsm->header.type = ntohs (GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_TO_STRING_REPLY);
918 if (GNUNET_OK == res)
920 /* this was the last call, transmit */
921 atsm->res = htonl (GNUNET_OK);
922 atsm->addr_len = htonl (0);
923 GNUNET_SERVER_transmit_context_append_message (actx->tc,
924 (const struct GNUNET_MessageHeader *) atsm);
925 GNUNET_SERVER_transmit_context_run (actx->tc,
926 GNUNET_TIME_UNIT_FOREVER_REL);
927 GNUNET_CONTAINER_DLL_remove (a2s_head,
934 if (GNUNET_SYSERR == res)
936 /* address conversion failed, but there will be more callbacks */
937 atsm->res = htonl (GNUNET_SYSERR);
938 atsm->addr_len = htonl (0);
939 GNUNET_SERVER_transmit_context_append_message (actx->tc,
940 (const struct GNUNET_MessageHeader *) atsm);
945 GNUNET_assert (GNUNET_OK == res);
946 /* succesful conversion, append*/
947 slen = strlen (buf) + 1;
948 len = sizeof (struct AddressToStringResultMessage) + slen;
949 atsm = GNUNET_malloc (len);
950 atsm->header.size = ntohs (len);
951 atsm->header.type = ntohs (GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_TO_STRING_REPLY);
952 atsm->res = htonl (GNUNET_YES);
953 atsm->addr_len = htonl (slen);
957 GNUNET_SERVER_transmit_context_append_message (actx->tc,
958 (const struct GNUNET_MessageHeader *) atsm);
964 * Client asked to resolve an address. Process the request.
967 * @param client the client
968 * @param message the resolution request
971 clients_handle_address_to_string (void *cls,
972 struct GNUNET_SERVER_Client *client,
973 const struct GNUNET_MessageHeader *message)
975 const struct AddressLookupMessage *alum;
976 struct GNUNET_TRANSPORT_PluginFunctions *papi;
977 const char *plugin_name;
979 uint32_t address_len;
981 struct GNUNET_SERVER_TransmitContext *tc;
982 struct AddressToStringContext *actx;
983 struct AddressToStringResultMessage atsm;
984 struct GNUNET_TIME_Relative rtimeout;
987 size = ntohs (message->size);
988 if (size < sizeof (struct AddressLookupMessage))
991 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
994 alum = (const struct AddressLookupMessage *) message;
995 address_len = ntohs (alum->addrlen);
996 if (size <= sizeof (struct AddressLookupMessage) + address_len)
999 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1002 address = (const char *) &alum[1];
1003 plugin_name = (const char *) &address[address_len];
1004 if ('\0' != plugin_name[size - sizeof (struct AddressLookupMessage) - address_len - 1])
1007 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1010 rtimeout = GNUNET_TIME_relative_ntoh (alum->timeout);
1011 numeric = ntohs (alum->numeric_only);
1012 tc = GNUNET_SERVER_transmit_context_create (client);
1013 papi = GST_plugins_printer_find (plugin_name);
1016 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1017 "Failed to find plugin `%s'\n",
1019 atsm.header.size = ntohs (sizeof (struct AddressToStringResultMessage));
1020 atsm.header.type = ntohs (GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_TO_STRING_REPLY);
1021 atsm.res = htonl (GNUNET_SYSERR);
1022 atsm.addr_len = htonl (0);
1023 GNUNET_SERVER_transmit_context_append_message (tc,
1025 atsm.header.size = ntohs (sizeof (struct AddressToStringResultMessage));
1026 atsm.header.type = ntohs (GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_TO_STRING_REPLY);
1027 atsm.res = htonl (GNUNET_OK);
1028 atsm.addr_len = htonl (0);
1029 GNUNET_SERVER_transmit_context_append_message (tc,
1031 GNUNET_SERVER_transmit_context_run (tc, GNUNET_TIME_UNIT_FOREVER_REL);
1034 actx = GNUNET_new (struct AddressToStringContext);
1036 GNUNET_CONTAINER_DLL_insert (a2s_head, a2s_tail, actx);
1037 GNUNET_SERVER_disable_receive_done_warning (client);
1038 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1039 "Pretty-printing address of %u bytes using plugin `%s'\n",
1042 papi->address_pretty_printer (papi->cls,
1044 address, address_len,
1047 &transmit_address_to_client,
1053 * Compose #PeerIterateResponseMessage using the given peer and address.
1055 * @param peer identity of the peer
1056 * @param address the address, NULL on disconnect
1057 * @return composed message
1059 static struct PeerIterateResponseMessage *
1060 compose_address_iterate_response_message (const struct GNUNET_PeerIdentity *peer,
1061 const struct GNUNET_HELLO_Address *address)
1063 struct PeerIterateResponseMessage *msg;
1069 GNUNET_assert (NULL != peer);
1070 if (NULL != address)
1072 tlen = strlen (address->transport_name) + 1;
1073 alen = address->address_length;
1080 size = (sizeof (struct PeerIterateResponseMessage) + alen + tlen);
1081 msg = GNUNET_malloc (size);
1082 msg->header.size = htons (size);
1084 htons (GNUNET_MESSAGE_TYPE_TRANSPORT_MONITOR_PEER_RESPONSE);
1085 msg->reserved = htonl (0);
1087 msg->addrlen = htonl (alen);
1088 msg->pluginlen = htonl (tlen);
1090 if (NULL != address)
1092 msg->local_address_info = htonl((uint32_t) address->local_info);
1093 addr = (char *) &msg[1];
1094 memcpy (addr, address->address, alen);
1095 memcpy (&addr[alen], address->transport_name, tlen);
1102 * Compose #PeerIterateResponseMessage using the given peer and address.
1104 * @param peer identity of the peer
1105 * @param address the address, NULL on disconnect
1106 * @return composed message
1108 static struct ValidationIterateResponseMessage *
1109 compose_validation_iterate_response_message (const struct GNUNET_PeerIdentity *peer,
1110 const struct GNUNET_HELLO_Address *address)
1112 struct ValidationIterateResponseMessage *msg;
1118 GNUNET_assert (NULL != peer);
1119 if (NULL != address)
1121 tlen = strlen (address->transport_name) + 1;
1122 alen = address->address_length;
1129 size = (sizeof (struct ValidationIterateResponseMessage) + alen + tlen);
1130 msg = GNUNET_malloc (size);
1131 msg->header.size = htons (size);
1133 htons (GNUNET_MESSAGE_TYPE_TRANSPORT_MONITOR_VALIDATION_RESPONSE);
1134 msg->reserved = htonl (0);
1136 msg->addrlen = htonl (alen);
1137 msg->pluginlen = htonl (tlen);
1139 if (NULL != address)
1141 msg->local_address_info = htonl((uint32_t) address->local_info);
1142 addr = (char *) &msg[1];
1143 memcpy (addr, address->address, alen);
1144 memcpy (&addr[alen], address->transport_name, tlen);
1151 * Context for #send_validation_information() and
1152 * #send_peer_information().
1154 struct IterationContext
1157 * Context to use for the transmission.
1159 struct GNUNET_SERVER_TransmitContext *tc;
1162 * Which peers do we care about?
1164 struct GNUNET_PeerIdentity id;
1167 * #GNUNET_YES if @e id should be ignored because we want all peers.
1174 * Output information of validation entries to the given client.
1176 * @param cls the `struct IterationContext *`
1177 * @param address the address
1178 * @param last_validation point in time when last validation was performed
1179 * @param valid_until point in time how long address is valid
1180 * @param next_validation point in time when next validation will be performed
1181 * @param state state of validation notification
1184 send_validation_information (void *cls,
1185 const struct GNUNET_HELLO_Address *address,
1186 struct GNUNET_TIME_Absolute last_validation,
1187 struct GNUNET_TIME_Absolute valid_until,
1188 struct GNUNET_TIME_Absolute next_validation,
1189 enum GNUNET_TRANSPORT_ValidationState state)
1191 struct IterationContext *pc = cls;
1192 struct ValidationIterateResponseMessage *msg;
1194 if ( (GNUNET_YES != pc->all) &&
1195 (0 != memcmp (&address->peer, &pc->id, sizeof (pc->id))) )
1197 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1198 "Sending information about for validation entry for peer `%s' using address `%s'\n",
1199 GNUNET_i2s (&address->peer),
1200 (NULL != address) ? GST_plugins_a2s (address) : "<none>");
1201 msg = compose_validation_iterate_response_message (&address->peer, address);
1202 msg->last_validation = GNUNET_TIME_absolute_hton(last_validation);
1203 msg->valid_until = GNUNET_TIME_absolute_hton(valid_until);
1204 msg->next_validation = GNUNET_TIME_absolute_hton(next_validation);
1205 msg->state = htonl ((uint32_t) state);
1206 GNUNET_SERVER_transmit_context_append_message (pc->tc, &msg->header);
1212 * Output information of neighbours to the given client.
1214 * @param cls the `struct PeerIterationContext *`
1215 * @param peer identity of the neighbour
1216 * @param address the address
1217 * @param state current state this peer is in
1218 * @param state_timeout timeout for the current state of the peer
1219 * @param bandwidth_in inbound quota in NBO
1220 * @param bandwidth_out outbound quota in NBO
1223 send_peer_information (void *cls,
1224 const struct GNUNET_PeerIdentity *peer,
1225 const struct GNUNET_HELLO_Address *address,
1226 enum GNUNET_TRANSPORT_PeerState state,
1227 struct GNUNET_TIME_Absolute state_timeout,
1228 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in,
1229 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out)
1231 struct IterationContext *pc = cls;
1232 struct PeerIterateResponseMessage *msg;
1234 if ( (GNUNET_YES != pc->all) &&
1235 (0 != memcmp (peer, &pc->id, sizeof (pc->id))) )
1237 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1238 "Sending information about `%s' using address `%s' in state `%s'\n",
1240 (NULL != address) ? GST_plugins_a2s (address) : "<none>",
1241 GNUNET_TRANSPORT_ps2s (state));
1242 msg = compose_address_iterate_response_message (peer, address);
1243 msg->state = htonl (state);
1244 msg->state_timeout = GNUNET_TIME_absolute_hton(state_timeout);
1245 GNUNET_SERVER_transmit_context_append_message (pc->tc, &msg->header);
1251 * Client asked to obtain information about a specific or all peers
1252 * Process the request.
1255 * @param client the client
1256 * @param message the peer address information request
1259 clients_handle_monitor_peers (void *cls,
1260 struct GNUNET_SERVER_Client *client,
1261 const struct GNUNET_MessageHeader *message)
1263 struct GNUNET_SERVER_TransmitContext *tc;
1264 const struct PeerMonitorMessage *msg;
1265 struct IterationContext pc;
1267 msg = (const struct PeerMonitorMessage *) message;
1268 if ( (GNUNET_YES != ntohl (msg->one_shot)) &&
1269 (NULL != lookup_monitoring_client (peer_monitoring_clients_head,
1273 GNUNET_SERVER_receive_done (client,
1277 GNUNET_SERVER_disable_receive_done_warning (client);
1278 GNUNET_SERVER_client_mark_monitor (client);
1279 pc.tc = tc = GNUNET_SERVER_transmit_context_create (client);
1281 /* Send initial list */
1282 if (0 == memcmp (&msg->peer,
1284 sizeof (struct GNUNET_PeerIdentity)))
1286 /* iterate over all neighbours */
1287 pc.all = GNUNET_YES;
1292 /* just return one neighbour */
1296 GST_neighbours_iterate (&send_peer_information,
1299 if (GNUNET_YES != ntohl (msg->one_shot))
1301 setup_peer_monitoring_client (client,
1306 GNUNET_SERVER_transmit_context_append_data (tc,
1309 GNUNET_MESSAGE_TYPE_TRANSPORT_MONITOR_PEER_RESPONSE);
1311 GNUNET_SERVER_transmit_context_run (tc,
1312 GNUNET_TIME_UNIT_FOREVER_REL);
1317 * Client asked to obtain information about a specific or all validation
1321 * @param client the client
1322 * @param message the peer address information request
1325 clients_handle_monitor_validation (void *cls,
1326 struct GNUNET_SERVER_Client *client,
1327 const struct GNUNET_MessageHeader *message)
1329 struct GNUNET_SERVER_TransmitContext *tc;
1330 struct PeerMonitorMessage *msg;
1331 struct IterationContext pc;
1333 if (ntohs (message->type) != GNUNET_MESSAGE_TYPE_TRANSPORT_MONITOR_VALIDATION_REQUEST)
1336 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1339 if (ntohs (message->size) != sizeof (struct ValidationMonitorMessage))
1342 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1345 msg = (struct PeerMonitorMessage *) message;
1346 if ( (GNUNET_YES != ntohl (msg->one_shot)) &&
1347 (NULL != lookup_monitoring_client (val_monitoring_clients_head, client)) )
1350 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1353 GNUNET_SERVER_disable_receive_done_warning (client);
1354 GNUNET_SERVER_client_mark_monitor (client);
1355 pc.tc = tc = GNUNET_SERVER_transmit_context_create (client);
1357 /* Send initial list */
1358 if (0 == memcmp (&msg->peer,
1360 sizeof (struct GNUNET_PeerIdentity)))
1362 /* iterate over all neighbours */
1363 pc.all = GNUNET_YES;
1368 /* just return one neighbour */
1372 GST_validation_iterate (&send_validation_information,
1375 if (GNUNET_YES != ntohl (msg->one_shot))
1377 setup_val_monitoring_client (client, &msg->peer);
1381 GNUNET_SERVER_transmit_context_append_data (tc, NULL, 0,
1382 GNUNET_MESSAGE_TYPE_TRANSPORT_MONITOR_VALIDATION_RESPONSE);
1384 GNUNET_SERVER_transmit_context_run (tc, GNUNET_TIME_UNIT_FOREVER_REL);
1389 * Function called by the plugin with information about the
1390 * current sessions managed by the plugin (for monitoring).
1392 * @param cls closure
1393 * @param session session handle this information is about,
1394 * NULL to indicate that we are "in sync" (initial
1395 * iteration complete)
1396 * @param info information about the state of the session,
1397 * NULL if @a session is also NULL and we are
1398 * merely signalling that the initial iteration is over
1401 plugin_session_info_cb (void *cls,
1402 struct Session *session,
1403 const struct GNUNET_TRANSPORT_SessionInfo *info)
1405 struct TransportPluginMonitorMessage *msg;
1406 struct GNUNET_MessageHeader sync;
1413 if (0 == GNUNET_SERVER_notification_context_get_size (plugin_nc))
1415 GST_plugins_monitor_subscribe (NULL,
1419 if ( (NULL == info) &&
1422 /* end of initial iteration */
1423 if (NULL != sync_client)
1425 sync.size = htons (sizeof (struct GNUNET_MessageHeader));
1426 sync.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_MONITOR_PLUGIN_SYNC);
1427 GNUNET_SERVER_notification_context_unicast (plugin_nc,
1435 GNUNET_assert (NULL != info);
1436 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1437 "Plugin event for peer %s on transport %s\n",
1438 GNUNET_i2s (&info->address->peer),
1439 info->address->transport_name);
1440 slen = strlen (info->address->transport_name) + 1;
1441 alen = info->address->address_length;
1442 size = sizeof (struct TransportPluginMonitorMessage) + slen + alen;
1443 if (size > UINT16_MAX)
1448 msg = GNUNET_malloc (size);
1449 msg->header.size = htons (size);
1450 msg->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_MONITOR_PLUGIN_EVENT);
1451 msg->session_state = htons ((uint16_t) info->state);
1452 msg->is_inbound = htons ((int16_t) info->is_inbound);
1453 msg->msgs_pending = htonl (info->num_msg_pending);
1454 msg->bytes_pending = htonl (info->num_bytes_pending);
1455 msg->timeout = GNUNET_TIME_absolute_hton (info->session_timeout);
1456 msg->delay = GNUNET_TIME_absolute_hton (info->receive_delay);
1457 msg->peer = info->address->peer;
1458 msg->session_id = (uint64_t) (intptr_t) session;
1459 msg->plugin_name_len = htons (slen);
1460 msg->plugin_address_len = htons (alen);
1461 name = (char *) &msg[1];
1463 info->address->transport_name,
1467 info->address->address,
1469 if (NULL != sync_client)
1470 GNUNET_SERVER_notification_context_unicast (plugin_nc,
1475 GNUNET_SERVER_notification_context_broadcast (plugin_nc,
1483 * Client asked to obtain information about all plugin connections.
1486 * @param client the client
1487 * @param message the peer address information request
1490 clients_handle_monitor_plugins (void *cls,
1491 struct GNUNET_SERVER_Client *client,
1492 const struct GNUNET_MessageHeader *message)
1494 GNUNET_SERVER_client_mark_monitor (client);
1495 GNUNET_SERVER_disable_receive_done_warning (client);
1496 GNUNET_SERVER_notification_context_add (plugin_nc,
1498 GNUNET_assert (NULL == sync_client);
1499 sync_client = client;
1500 GST_plugins_monitor_subscribe (&plugin_session_info_cb,
1506 * Start handling requests from clients.
1508 * @param server server used to accept clients from.
1511 GST_clients_start (struct GNUNET_SERVER_Handle *server)
1513 static const struct GNUNET_SERVER_MessageHandler handlers[] = {
1514 {&clients_handle_start, NULL,
1515 GNUNET_MESSAGE_TYPE_TRANSPORT_START, sizeof (struct StartMessage)},
1516 {&clients_handle_hello, NULL,
1517 GNUNET_MESSAGE_TYPE_HELLO, 0},
1518 {&clients_handle_send, NULL,
1519 GNUNET_MESSAGE_TYPE_TRANSPORT_SEND, 0},
1520 {&clients_handle_request_connect, NULL,
1521 GNUNET_MESSAGE_TYPE_TRANSPORT_REQUEST_CONNECT,
1522 sizeof (struct TransportRequestConnectMessage)},
1523 {&clients_handle_request_disconnect, NULL,
1524 GNUNET_MESSAGE_TYPE_TRANSPORT_REQUEST_DISCONNECT,
1525 sizeof (struct TransportRequestDisconnectMessage)},
1526 {&clients_handle_address_to_string, NULL,
1527 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_TO_STRING, 0},
1528 {&clients_handle_monitor_peers, NULL,
1529 GNUNET_MESSAGE_TYPE_TRANSPORT_MONITOR_PEER_REQUEST,
1530 sizeof (struct PeerMonitorMessage)},
1531 {&clients_handle_monitor_validation, NULL,
1532 GNUNET_MESSAGE_TYPE_TRANSPORT_MONITOR_VALIDATION_REQUEST,
1533 sizeof (struct ValidationMonitorMessage)},
1534 {&GST_blacklist_handle_init, NULL,
1535 GNUNET_MESSAGE_TYPE_TRANSPORT_BLACKLIST_INIT,
1536 sizeof (struct GNUNET_MessageHeader)},
1537 {&GST_blacklist_handle_reply, NULL,
1538 GNUNET_MESSAGE_TYPE_TRANSPORT_BLACKLIST_REPLY,
1539 sizeof (struct BlacklistMessage)},
1540 {&GST_manipulation_set_metric, NULL,
1541 GNUNET_MESSAGE_TYPE_TRANSPORT_TRAFFIC_METRIC,
1542 sizeof (struct TrafficMetricMessage) },
1543 {&clients_handle_monitor_plugins, NULL,
1544 GNUNET_MESSAGE_TYPE_TRANSPORT_MONITOR_PLUGIN_START,
1545 sizeof (struct GNUNET_MessageHeader) },
1548 peer_nc = GNUNET_SERVER_notification_context_create (server, 0);
1549 val_nc = GNUNET_SERVER_notification_context_create (server, 0);
1550 plugin_nc = GNUNET_SERVER_notification_context_create (server, 0);
1551 GNUNET_SERVER_add_handlers (server, handlers);
1552 GNUNET_SERVER_disconnect_notify (server,
1553 &client_disconnect_notification,
1559 * Stop processing clients.
1564 struct AddressToStringContext *cur;
1566 while (NULL != (cur = a2s_head))
1568 GNUNET_SERVER_transmit_context_destroy (cur->tc, GNUNET_NO);
1569 GNUNET_CONTAINER_DLL_remove (a2s_head, a2s_tail, cur);
1572 if (NULL != peer_nc)
1574 GNUNET_SERVER_notification_context_destroy (peer_nc);
1579 GNUNET_SERVER_notification_context_destroy (val_nc);
1582 if (NULL != plugin_nc)
1584 GNUNET_SERVER_notification_context_destroy (plugin_nc);
1591 * Broadcast the given message to all of our clients.
1593 * @param msg message to broadcast
1594 * @param may_drop #GNUNET_YES if the message can be dropped / is payload
1597 GST_clients_broadcast (const struct GNUNET_MessageHeader *msg,
1600 struct TransportClient *tc;
1602 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1603 "Asked to broadcast message of type %u with %u bytes\n",
1604 (unsigned int) ntohs (msg->type),
1605 (unsigned int) ntohs (msg->size));
1606 for (tc = clients_head; NULL != tc; tc = tc->next)
1608 if ( (GNUNET_YES == may_drop) &&
1609 (GNUNET_YES != tc->send_payload) )
1610 continue; /* skip, this client does not care about payload */
1611 unicast (tc, msg, may_drop);
1617 * Send the given message to a particular client
1619 * @param client target of the message
1620 * @param msg message to transmit
1621 * @param may_drop #GNUNET_YES if the message can be dropped
1624 GST_clients_unicast (struct GNUNET_SERVER_Client *client,
1625 const struct GNUNET_MessageHeader *msg,
1628 struct TransportClient *tc;
1630 tc = lookup_client (client);
1632 return; /* client got disconnected in the meantime, drop message */
1633 unicast (tc, msg, may_drop);
1638 * Broadcast the new active address to all clients monitoring the peer.
1640 * @param peer peer this update is about (never NULL)
1641 * @param address address, NULL on disconnect
1642 * @param state the current state of the peer
1643 * @param state_timeout the time out for the state
1646 GST_clients_broadcast_peer_notification (const struct GNUNET_PeerIdentity *peer,
1647 const struct GNUNET_HELLO_Address *address,
1648 enum GNUNET_TRANSPORT_PeerState state,
1649 struct GNUNET_TIME_Absolute state_timeout)
1651 struct PeerIterateResponseMessage *msg;
1652 struct MonitoringClient *mc;
1654 msg = compose_address_iterate_response_message (peer, address);
1655 msg->state = htonl (state);
1656 msg->state_timeout = GNUNET_TIME_absolute_hton (state_timeout);
1657 for (mc = peer_monitoring_clients_head; NULL != mc; mc = mc->next)
1658 if ((0 == memcmp (&mc->peer, &all_zeros,
1659 sizeof (struct GNUNET_PeerIdentity))) ||
1660 (0 == memcmp (&mc->peer, peer,
1661 sizeof (struct GNUNET_PeerIdentity))))
1662 GNUNET_SERVER_notification_context_unicast (peer_nc,
1671 * Broadcast the new validation changes to all clients monitoring the peer.
1673 * @param peer peer this update is about (never NULL)
1674 * @param address address, NULL on disconnect
1675 * @param last_validation point in time when last validation was performed
1676 * @param valid_until point in time how long address is valid
1677 * @param next_validation point in time when next validation will be performed
1678 * @param state state of validation notification
1681 GST_clients_broadcast_validation_notification (const struct GNUNET_PeerIdentity *peer,
1682 const struct GNUNET_HELLO_Address *address,
1683 struct GNUNET_TIME_Absolute last_validation,
1684 struct GNUNET_TIME_Absolute valid_until,
1685 struct GNUNET_TIME_Absolute next_validation,
1686 enum GNUNET_TRANSPORT_ValidationState state)
1688 struct ValidationIterateResponseMessage *msg;
1689 struct MonitoringClient *mc;
1691 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1692 "Sending information about for validation entry for peer `%s' using address `%s'\n",
1694 (address != NULL) ? GST_plugins_a2s (address) : "<none>");
1695 msg = compose_validation_iterate_response_message (peer, address);
1696 msg->last_validation = GNUNET_TIME_absolute_hton(last_validation);
1697 msg->valid_until = GNUNET_TIME_absolute_hton(valid_until);
1698 msg->next_validation = GNUNET_TIME_absolute_hton(next_validation);
1699 msg->state = htonl ((uint32_t) state);
1700 for (mc = val_monitoring_clients_head; NULL != mc; mc = mc->next)
1701 if ((0 == memcmp (&mc->peer, &all_zeros,
1702 sizeof (struct GNUNET_PeerIdentity))) ||
1703 (0 == memcmp (&mc->peer, peer,
1704 sizeof (struct GNUNET_PeerIdentity))))
1705 GNUNET_SERVER_notification_context_unicast (val_nc,
1713 /* end of file gnunet-service-transport_clients.c */