2 This file is part of GNUnet.
3 (C) 2009-2013 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
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.
10 GNUnet is distributed in the hope that it will be useful, but
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., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
23 * @brief library for building GNUnet network servers
24 * @author Christian Grothoff
28 #include "gnunet_util_lib.h"
29 #include "gnunet_protocols.h"
31 #define LOG(kind,...) GNUNET_log_from (kind, "util", __VA_ARGS__)
33 #define LOG_STRERROR(kind,syscall) GNUNET_log_from_strerror (kind, "util", syscall)
35 #define LOG_STRERROR_FILE(kind,syscall,filename) GNUNET_log_from_strerror_file (kind, "util", syscall, filename)
39 * List of arrays of message handlers.
44 * This is a linked list.
46 struct HandlerList *next;
49 * NULL-terminated array of handlers.
51 const struct GNUNET_SERVER_MessageHandler *handlers;
56 * List of arrays of message handlers.
61 * This is a doubly linked list.
63 struct NotifyList *next;
66 * This is a doubly linked list.
68 struct NotifyList *prev;
73 GNUNET_SERVER_DisconnectCallback callback;
76 * Closure for callback.
83 * @brief handle for a server
85 struct GNUNET_SERVER_Handle
88 * List of handlers for incoming messages.
90 struct HandlerList *handlers;
93 * Head of list of our current clients.
95 struct GNUNET_SERVER_Client *clients_head;
98 * Head of list of our current clients.
100 struct GNUNET_SERVER_Client *clients_tail;
103 * Head of linked list of functions to call on disconnects by clients.
105 struct NotifyList *disconnect_notify_list_head;
108 * Tail of linked list of functions to call on disconnects by clients.
110 struct NotifyList *disconnect_notify_list_tail;
113 * Head of linked list of functions to call on connects by clients.
115 struct NotifyList *connect_notify_list_head;
118 * Tail of linked list of functions to call on connects by clients.
120 struct NotifyList *connect_notify_list_tail;
123 * Function to call for access control.
125 GNUNET_CONNECTION_AccessCheck access;
128 * Closure for access.
133 * NULL-terminated array of sockets used to listen for new
136 struct GNUNET_NETWORK_Handle **listen_sockets;
139 * After how long should an idle connection time
142 struct GNUNET_TIME_Relative idle_timeout;
145 * Task scheduled to do the listening.
147 GNUNET_SCHEDULER_TaskIdentifier listen_task;
150 * Alternative function to create a MST instance.
152 GNUNET_SERVER_MstCreateCallback mst_create;
155 * Alternative function to destroy a MST instance.
157 GNUNET_SERVER_MstDestroyCallback mst_destroy;
160 * Alternative function to give data to a MST instance.
162 GNUNET_SERVER_MstReceiveCallback mst_receive;
165 * Closure for 'mst_'-callbacks.
170 * Do we ignore messages of types that we do not understand or do we
171 * require that a handler is found (and if not kill the connection)?
176 * Set to #GNUNET_YES once we are in 'soft' shutdown where we wait for
177 * all non-monitor clients to disconnect before we call
178 * #GNUNET_SERVER_destroy. See 'test_monitor_clients'. Set to
179 * #GNUNET_SYSERR once the final destroy task has been scheduled
180 * (we cannot run it in the same task).
182 int in_soft_shutdown;
187 * Handle server returns for aborting transmission to a client.
189 struct GNUNET_SERVER_TransmitHandle
192 * Function to call to get the message.
194 GNUNET_CONNECTION_TransmitReadyNotify callback;
197 * Closure for @e callback
202 * Active connection transmission handle.
204 struct GNUNET_CONNECTION_TransmitHandle *cth;
210 * @brief handle for a client of the server
212 struct GNUNET_SERVER_Client
216 * This is a doubly linked list.
218 struct GNUNET_SERVER_Client *next;
221 * This is a doubly linked list.
223 struct GNUNET_SERVER_Client *prev;
226 * Processing of incoming data.
231 * Server that this client belongs to.
233 struct GNUNET_SERVER_Handle *server;
236 * Client closure for callbacks.
238 struct GNUNET_CONNECTION_Handle *connection;
241 * User context value, manipulated using
242 * 'GNUNET_SERVER_client_{get/set}_user_context' functions.
247 * ID of task used to restart processing.
249 GNUNET_SCHEDULER_TaskIdentifier restart_task;
252 * Task that warns about missing calls to #GNUNET_SERVER_receive_done.
254 GNUNET_SCHEDULER_TaskIdentifier warn_task;
257 * Time when the warn task was started.
259 struct GNUNET_TIME_Absolute warn_start;
262 * Last activity on this socket (used to time it out
263 * if reference_count == 0).
265 struct GNUNET_TIME_Absolute last_activity;
268 * Transmission handle we return for this client from
269 * #GNUNET_SERVER_notify_transmit_ready.
271 struct GNUNET_SERVER_TransmitHandle th;
274 * After how long should an idle connection time
277 struct GNUNET_TIME_Relative idle_timeout;
280 * Number of external entities with a reference to
281 * this client object.
283 unsigned int reference_count;
286 * Was processing if incoming messages suspended while
287 * we were still processing data already received?
288 * This is a counter saying how often processing was
289 * suspended (once per handler invoked).
291 unsigned int suspended;
294 * Last size given when user context was initialized; used for
297 size_t user_context_size;
300 * Are we currently in the "process_client_buffer" function (and
301 * will hence restart the receive job on exit if suspended == 0 once
302 * we are done?). If this is set, then "receive_done" will
303 * essentially only decrement suspended; if this is not set, then
304 * "receive_done" may need to restart the receive process (either
305 * from the side-buffer or via select/recv).
307 int in_process_client_buffer;
310 * We're about to close down this client.
315 * Are we currently trying to receive? (#GNUNET_YES if we are,
316 * #GNUNET_NO if we are not, #GNUNET_SYSERR if data is already
322 * Persist the file handle for this client no matter what happens,
323 * force the OS to close once the process actually dies. Should only
324 * be used in special cases!
329 * Is this client a 'monitor' client that should not be counted
330 * when deciding on destroying the server during soft shutdown?
331 * (see also #GNUNET_SERVICE_start)
336 * Type of last message processed (for warn_no_receive_done).
344 * Return user context associated with the given client.
345 * Note: you should probably use the macro (call without the underscore).
347 * @param client client to query
348 * @param size number of bytes in user context struct (for verification only)
349 * @return pointer to user context
352 GNUNET_SERVER_client_get_user_context_ (struct GNUNET_SERVER_Client *client,
355 if ((0 == client->user_context_size) &&
356 (NULL == client->user_context))
357 return NULL; /* never set */
358 GNUNET_assert (size == client->user_context_size);
359 return client->user_context;
364 * Set user context to be associated with the given client.
365 * Note: you should probably use the macro (call without the underscore).
367 * @param client client to query
368 * @param ptr pointer to user context
369 * @param size number of bytes in user context struct (for verification only)
372 GNUNET_SERVER_client_set_user_context_ (struct GNUNET_SERVER_Client *client,
378 client->user_context_size = 0;
379 client->user_context = ptr;
382 client->user_context_size = size;
383 client->user_context = ptr;
388 * Scheduler says our listen socket is ready. Process it!
390 * @param cls handle to our server for which we are processing the listen
392 * @param tc reason why we are running right now
395 process_listen_socket (void *cls,
396 const struct GNUNET_SCHEDULER_TaskContext *tc)
398 struct GNUNET_SERVER_Handle *server = cls;
399 struct GNUNET_CONNECTION_Handle *sock;
400 struct GNUNET_SERVER_Client *client;
403 server->listen_task = GNUNET_SCHEDULER_NO_TASK;
404 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
406 /* ignore shutdown, someone else will take care of it! */
407 GNUNET_SERVER_resume (server);
411 while (NULL != server->listen_sockets[i])
413 if (GNUNET_NETWORK_fdset_isset (tc->read_ready, server->listen_sockets[i]))
416 GNUNET_CONNECTION_create_from_accept (server->access,
418 server->listen_sockets[i]);
421 LOG (GNUNET_ERROR_TYPE_DEBUG,
422 "Server accepted incoming connection.\n");
423 client = GNUNET_SERVER_connect_socket (server, sock);
424 /* decrement reference count, we don't keep "client" alive */
425 GNUNET_SERVER_client_drop (client);
430 /* listen for more! */
431 GNUNET_SERVER_resume (server);
436 * Create and initialize a listen socket for the server.
438 * @param server_addr address to listen on
439 * @param socklen length of @a server_addr
440 * @return NULL on error, otherwise the listen socket
442 static struct GNUNET_NETWORK_Handle *
443 open_listen_socket (const struct sockaddr *server_addr, socklen_t socklen)
445 struct GNUNET_NETWORK_Handle *sock;
449 switch (server_addr->sa_family)
452 port = ntohs (((const struct sockaddr_in *) server_addr)->sin_port);
455 port = ntohs (((const struct sockaddr_in6 *) server_addr)->sin6_port);
465 sock = GNUNET_NETWORK_socket_create (server_addr->sa_family, SOCK_STREAM, 0);
468 LOG_STRERROR (GNUNET_ERROR_TYPE_ERROR, "socket");
472 /* bind the socket */
473 if (GNUNET_OK != GNUNET_NETWORK_socket_bind (sock, server_addr, socklen))
476 if (EADDRINUSE != errno)
478 /* we don't log 'EADDRINUSE' here since an IPv4 bind may
479 * fail if we already took the port on IPv6; if both IPv4 and
480 * IPv6 binds fail, then our caller will log using the
481 * errno preserved in 'eno' */
482 LOG_STRERROR (GNUNET_ERROR_TYPE_ERROR, "bind");
484 LOG (GNUNET_ERROR_TYPE_ERROR, _("`%s' failed for port %d (%s).\n"),
486 (AF_INET == server_addr->sa_family) ? "IPv4" : "IPv6");
492 LOG (GNUNET_ERROR_TYPE_WARNING,
493 _("`%s' failed for port %d (%s): address already in use\n"),
495 (AF_INET == server_addr->sa_family) ? "IPv4" : "IPv6");
496 else if (AF_UNIX == server_addr->sa_family)
498 LOG (GNUNET_ERROR_TYPE_WARNING,
499 _("`%s' failed for `%s': address already in use\n"),
501 GNUNET_a2s (server_addr, socklen));
504 GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (sock));
508 if (GNUNET_OK != GNUNET_NETWORK_socket_listen (sock, 5))
510 LOG_STRERROR (GNUNET_ERROR_TYPE_ERROR, "listen");
511 GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (sock));
516 LOG (GNUNET_ERROR_TYPE_DEBUG, "Server starts to listen on port %u.\n",
523 * Create a new server.
525 * @param access function for access control
526 * @param access_cls closure for access
527 * @param lsocks NULL-terminated array of listen sockets
528 * @param idle_timeout after how long should we timeout idle connections?
529 * @param require_found if #GNUNET_YES, connections sending messages of unknown type
531 * @return handle for the new server, NULL on error
532 * (typically, "port" already in use)
534 struct GNUNET_SERVER_Handle *
535 GNUNET_SERVER_create_with_sockets (GNUNET_CONNECTION_AccessCheck access,
537 struct GNUNET_NETWORK_Handle **lsocks,
538 struct GNUNET_TIME_Relative idle_timeout,
541 struct GNUNET_SERVER_Handle *server;
543 server = GNUNET_new (struct GNUNET_SERVER_Handle);
544 server->idle_timeout = idle_timeout;
545 server->listen_sockets = lsocks;
546 server->access = access;
547 server->access_cls = access_cls;
548 server->require_found = require_found;
550 GNUNET_SERVER_resume (server);
556 * Create a new server.
558 * @param access function for access control
559 * @param access_cls closure for access
560 * @param server_addr address to listen on (including port), NULL terminated array
561 * @param socklen length of server_addr
562 * @param idle_timeout after how long should we timeout idle connections?
563 * @param require_found if YES, connections sending messages of unknown type
565 * @return handle for the new server, NULL on error
566 * (typically, "port" already in use)
568 struct GNUNET_SERVER_Handle *
569 GNUNET_SERVER_create (GNUNET_CONNECTION_AccessCheck access, void *access_cls,
570 struct sockaddr *const *server_addr,
571 const socklen_t * socklen,
572 struct GNUNET_TIME_Relative idle_timeout,
575 struct GNUNET_NETWORK_Handle **lsocks;
582 while (NULL != server_addr[i])
586 lsocks = GNUNET_malloc (sizeof (struct GNUNET_NETWORK_Handle *) * (i + 1));
589 while (NULL != server_addr[i])
593 if ( (socklen[k] == socklen[i]) &&
594 (0 == memcmp (server_addr[k], server_addr[i], socklen[i])) )
601 /* duplicate address, skip */
605 lsocks[j] = open_listen_socket (server_addr[i], socklen[i]);
606 if (NULL != lsocks[j])
613 LOG_STRERROR (GNUNET_ERROR_TYPE_ERROR, "bind");
614 GNUNET_free (lsocks);
622 return GNUNET_SERVER_create_with_sockets (access, access_cls, lsocks,
623 idle_timeout, require_found);
628 * Set the 'monitor' flag on this client. Clients which have been
629 * marked as 'monitors' won't prevent the server from shutting down
630 * once '#GNUNET_SERVER_stop_listening()' has been invoked. The idea is
631 * that for "normal" clients we likely want to allow them to process
632 * their requests; however, monitor-clients are likely to 'never'
633 * disconnect during shutdown and thus will not be considered when
634 * determining if the server should continue to exist after
635 * 'GNUNET_SERVER_destroy' has been called.
637 * @param client the client to set the 'monitor' flag on
640 GNUNET_SERVER_client_mark_monitor (struct GNUNET_SERVER_Client *client)
642 client->is_monitor = GNUNET_YES;
647 * Helper function for 'test_monitor_clients' to trigger
648 * 'GNUNET_SERVER_destroy' after the stack has unwound.
650 * @param cls the 'struct GNUNET_SERVER_Handle' to destroy
654 do_destroy (void *cls,
655 const struct GNUNET_SCHEDULER_TaskContext *tc)
657 struct GNUNET_SERVER_Handle *server = cls;
658 GNUNET_SERVER_destroy (server);
663 * Check if only 'monitor' clients are left. If so, destroy the
666 * @param server server to test for full shutdown
669 test_monitor_clients (struct GNUNET_SERVER_Handle *server)
671 struct GNUNET_SERVER_Client *client;
673 if (GNUNET_YES != server->in_soft_shutdown)
675 for (client = server->clients_head; NULL != client; client = client->next)
676 if (GNUNET_NO == client->is_monitor)
677 return; /* not done yet */
678 server->in_soft_shutdown = GNUNET_SYSERR;
679 GNUNET_SCHEDULER_add_continuation (&do_destroy, server,
680 GNUNET_SCHEDULER_REASON_PREREQ_DONE);
685 * Suspend accepting connections from the listen socket temporarily.
687 * @param server server to stop accepting connections.
690 GNUNET_SERVER_suspend (struct GNUNET_SERVER_Handle *server)
692 if (GNUNET_SCHEDULER_NO_TASK != server->listen_task)
694 GNUNET_SCHEDULER_cancel (server->listen_task);
695 server->listen_task = GNUNET_SCHEDULER_NO_TASK;
701 * Resume accepting connections from the listen socket.
703 * @param server server to stop accepting connections.
706 GNUNET_SERVER_resume (struct GNUNET_SERVER_Handle *server)
708 struct GNUNET_NETWORK_FDSet *r;
711 if (NULL == server->listen_sockets)
713 if (NULL == server->listen_sockets[0])
714 return; /* nothing to do, no listen sockets! */
715 if (NULL == server->listen_sockets[1])
717 /* simplified method: no fd set needed; this is then much simpler and
718 much more efficient */
719 server->listen_task =
720 GNUNET_SCHEDULER_add_read_net_with_priority (GNUNET_TIME_UNIT_FOREVER_REL,
721 GNUNET_SCHEDULER_PRIORITY_HIGH,
722 server->listen_sockets[0],
723 &process_listen_socket, server);
726 r = GNUNET_NETWORK_fdset_create ();
728 while (NULL != server->listen_sockets[i])
729 GNUNET_NETWORK_fdset_set (r, server->listen_sockets[i++]);
730 server->listen_task =
731 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_HIGH,
732 GNUNET_TIME_UNIT_FOREVER_REL, r, NULL,
733 &process_listen_socket, server);
734 GNUNET_NETWORK_fdset_destroy (r);
739 * Stop the listen socket and get ready to shutdown the server
740 * once only 'monitor' clients are left.
742 * @param server server to stop listening on
745 GNUNET_SERVER_stop_listening (struct GNUNET_SERVER_Handle *server)
749 LOG (GNUNET_ERROR_TYPE_DEBUG,
750 "Server in soft shutdown\n");
751 if (GNUNET_SCHEDULER_NO_TASK != server->listen_task)
753 GNUNET_SCHEDULER_cancel (server->listen_task);
754 server->listen_task = GNUNET_SCHEDULER_NO_TASK;
756 if (NULL != server->listen_sockets)
759 while (NULL != server->listen_sockets[i])
760 GNUNET_break (GNUNET_OK ==
761 GNUNET_NETWORK_socket_close (server->listen_sockets[i++]));
762 GNUNET_free (server->listen_sockets);
763 server->listen_sockets = NULL;
765 if (GNUNET_NO == server->in_soft_shutdown)
766 server->in_soft_shutdown = GNUNET_YES;
767 test_monitor_clients (server);
772 * Free resources held by this server.
774 * @param server server to destroy
777 GNUNET_SERVER_destroy (struct GNUNET_SERVER_Handle *server)
779 struct HandlerList *hpos;
780 struct NotifyList *npos;
783 LOG (GNUNET_ERROR_TYPE_DEBUG,
784 "Server shutting down.\n");
785 if (GNUNET_SCHEDULER_NO_TASK != server->listen_task)
787 GNUNET_SCHEDULER_cancel (server->listen_task);
788 server->listen_task = GNUNET_SCHEDULER_NO_TASK;
790 if (NULL != server->listen_sockets)
793 while (NULL != server->listen_sockets[i])
794 GNUNET_break (GNUNET_OK ==
795 GNUNET_NETWORK_socket_close (server->listen_sockets[i++]));
796 GNUNET_free (server->listen_sockets);
797 server->listen_sockets = NULL;
799 while (NULL != server->clients_head)
800 GNUNET_SERVER_client_disconnect (server->clients_head);
801 while (NULL != (hpos = server->handlers))
803 server->handlers = hpos->next;
806 while (NULL != (npos = server->disconnect_notify_list_head))
808 npos->callback (npos->callback_cls, NULL);
809 GNUNET_CONTAINER_DLL_remove (server->disconnect_notify_list_head,
810 server->disconnect_notify_list_tail,
814 while (NULL != (npos = server->connect_notify_list_head))
816 npos->callback (npos->callback_cls, NULL);
817 GNUNET_CONTAINER_DLL_remove (server->connect_notify_list_head,
818 server->connect_notify_list_tail,
822 GNUNET_free (server);
827 * Add additional handlers to an existing server.
829 * @param server the server to add handlers to
830 * @param handlers array of message handlers for
831 * incoming messages; the last entry must
832 * have "NULL" for the "callback"; multiple
833 * entries for the same type are allowed,
834 * they will be called in order of occurence.
835 * These handlers can be removed later;
836 * the handlers array must exist until removed
837 * (or server is destroyed).
840 GNUNET_SERVER_add_handlers (struct GNUNET_SERVER_Handle *server,
841 const struct GNUNET_SERVER_MessageHandler *handlers)
843 struct HandlerList *p;
845 p = GNUNET_new (struct HandlerList);
846 p->handlers = handlers;
847 p->next = server->handlers;
848 server->handlers = p;
853 * Change functions used by the server to tokenize the message stream.
854 * (very rarely used).
856 * @param server server to modify
857 * @param create new tokenizer initialization function
858 * @param destroy new tokenizer destruction function
859 * @param receive new tokenizer receive function
860 * @param cls closure for @a create, @a receive, @a destroy
863 GNUNET_SERVER_set_callbacks (struct GNUNET_SERVER_Handle *server,
864 GNUNET_SERVER_MstCreateCallback create,
865 GNUNET_SERVER_MstDestroyCallback destroy,
866 GNUNET_SERVER_MstReceiveCallback receive,
869 server->mst_create = create;
870 server->mst_destroy = destroy;
871 server->mst_receive = receive;
872 server->mst_cls = cls;
877 * Task run to warn about missing calls to #GNUNET_SERVER_receive_done.
879 * @param cls our `struct GNUNET_SERVER_Client *` to process more requests from
880 * @param tc scheduler context (unused)
883 warn_no_receive_done (void *cls,
884 const struct GNUNET_SCHEDULER_TaskContext *tc)
886 struct GNUNET_SERVER_Client *client = cls;
888 GNUNET_break (0 != client->warn_type); /* type should never be 0 here, as we don't use 0 */
890 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_MINUTES,
891 &warn_no_receive_done, client);
892 if (0 == (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
893 LOG (GNUNET_ERROR_TYPE_WARNING,
894 _("Processing code for message of type %u did not call `GNUNET_SERVER_receive_done' after %s\n"),
895 (unsigned int) client->warn_type,
896 GNUNET_STRINGS_relative_time_to_string (GNUNET_TIME_absolute_get_duration (client->warn_start), GNUNET_YES));
901 * Disable the warning the server issues if a message is not acknowledged
902 * in a timely fashion. Use this call if a client is intentionally delayed
903 * for a while. Only applies to the current message.
905 * @param client client for which to disable the warning
908 GNUNET_SERVER_disable_receive_done_warning (struct GNUNET_SERVER_Client *client)
910 if (GNUNET_SCHEDULER_NO_TASK != client->warn_task)
912 GNUNET_SCHEDULER_cancel (client->warn_task);
913 client->warn_task = GNUNET_SCHEDULER_NO_TASK;
919 * Inject a message into the server, pretend it came
920 * from the specified client. Delivery of the message
921 * will happen instantly (if a handler is installed;
922 * otherwise the call does nothing).
924 * @param server the server receiving the message
925 * @param sender the "pretended" sender of the message
927 * @param message message to transmit
928 * @return GNUNET_OK if the message was OK and the
929 * connection can stay open
930 * GNUNET_SYSERR if the connection to the
931 * client should be shut down
934 GNUNET_SERVER_inject (struct GNUNET_SERVER_Handle *server,
935 struct GNUNET_SERVER_Client *sender,
936 const struct GNUNET_MessageHeader *message)
938 struct HandlerList *pos;
939 const struct GNUNET_SERVER_MessageHandler *mh;
945 type = ntohs (message->type);
946 size = ntohs (message->size);
947 LOG (GNUNET_ERROR_TYPE_DEBUG,
948 "Server schedules transmission of %u-byte message of type %u to client.\n",
951 for (pos = server->handlers; NULL != pos; pos = pos->next)
954 while (pos->handlers[i].callback != NULL)
956 mh = &pos->handlers[i];
957 if ((mh->type == type) || (mh->type == GNUNET_MESSAGE_TYPE_ALL))
959 if ((0 != mh->expected_size) && (mh->expected_size != size))
961 #if GNUNET8_NETWORK_IS_DEAD
962 LOG (GNUNET_ERROR_TYPE_WARNING,
963 "Expected %u bytes for message of type %u, got %u\n",
964 mh->expected_size, mh->type, size);
967 LOG (GNUNET_ERROR_TYPE_DEBUG,
968 "Expected %u bytes for message of type %u, got %u\n",
969 mh->expected_size, mh->type, size);
971 return GNUNET_SYSERR;
975 if ( (0 == sender->suspended) &&
976 (GNUNET_SCHEDULER_NO_TASK == sender->warn_task) )
978 GNUNET_break (0 != type); /* type should never be 0 here, as we don't use 0 */
979 sender->warn_start = GNUNET_TIME_absolute_get ();
981 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_MINUTES,
982 &warn_no_receive_done, sender);
983 sender->warn_type = type;
987 mh->callback (mh->callback_cls, sender, message);
993 if (GNUNET_NO == found)
995 LOG (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
996 "Received message of unknown type %d\n", type);
997 if (GNUNET_YES == server->require_found)
998 return GNUNET_SYSERR;
1005 * We are receiving an incoming message. Process it.
1007 * @param cls our closure (handle for the client)
1008 * @param buf buffer with data received from network
1009 * @param available number of bytes available in buf
1010 * @param addr address of the sender
1011 * @param addrlen length of @a addr
1012 * @param errCode code indicating errors receiving, 0 for success
1015 process_incoming (void *cls,
1018 const struct sockaddr *addr,
1024 * Process messages from the client's message tokenizer until either
1025 * the tokenizer is empty (and then schedule receiving more), or
1026 * until some handler is not immediately done (then wait for restart_processing)
1029 * @param client the client to process, RC must have already been increased
1030 * using #GNUNET_SERVER_client_keep and will be decreased by one in this
1032 * @param ret #GNUNET_NO to start processing from the buffer,
1033 * #GNUNET_OK if the mst buffer is drained and we should instantly go back to receiving
1034 * #GNUNET_SYSERR if we should instantly abort due to error in a previous step
1037 process_mst (struct GNUNET_SERVER_Client *client, int ret)
1039 while ((GNUNET_SYSERR != ret) && (NULL != client->server) &&
1040 (GNUNET_YES != client->shutdown_now) && (0 == client->suspended))
1042 if (GNUNET_OK == ret)
1044 LOG (GNUNET_ERROR_TYPE_DEBUG,
1045 "Server re-enters receive loop, timeout: %s.\n",
1046 GNUNET_STRINGS_relative_time_to_string (client->idle_timeout, GNUNET_YES));
1047 client->receive_pending = GNUNET_YES;
1048 GNUNET_CONNECTION_receive (client->connection,
1049 GNUNET_SERVER_MAX_MESSAGE_SIZE - 1,
1050 client->idle_timeout, &process_incoming,
1054 LOG (GNUNET_ERROR_TYPE_DEBUG,
1055 "Server processes additional messages instantly.\n");
1056 if (NULL != client->server->mst_receive)
1058 client->server->mst_receive (client->server->mst_cls, client->mst,
1059 client, NULL, 0, GNUNET_NO, GNUNET_YES);
1062 GNUNET_SERVER_mst_receive (client->mst, client, NULL, 0, GNUNET_NO,
1065 LOG (GNUNET_ERROR_TYPE_DEBUG,
1066 "Server leaves instant processing loop: ret = %d, server = %p, shutdown = %d, suspended = %u\n",
1067 ret, client->server,
1068 client->shutdown_now,
1070 if (GNUNET_NO == ret)
1072 LOG (GNUNET_ERROR_TYPE_DEBUG,
1073 "Server has more data pending but is suspended.\n");
1074 client->receive_pending = GNUNET_SYSERR; /* data pending */
1076 if ( (GNUNET_SYSERR == ret) ||
1077 (GNUNET_YES == client->shutdown_now) )
1078 GNUNET_SERVER_client_disconnect (client);
1083 * We are receiving an incoming message. Process it.
1085 * @param cls our closure (handle for the client)
1086 * @param buf buffer with data received from network
1087 * @param available number of bytes available in buf
1088 * @param addr address of the sender
1089 * @param addrlen length of addr
1090 * @param errCode code indicating errors receiving, 0 for success
1093 process_incoming (void *cls, const void *buf, size_t available,
1094 const struct sockaddr *addr, socklen_t addrlen, int errCode)
1096 struct GNUNET_SERVER_Client *client = cls;
1097 struct GNUNET_SERVER_Handle *server = client->server;
1098 struct GNUNET_TIME_Absolute end;
1099 struct GNUNET_TIME_Absolute now;
1102 GNUNET_assert (GNUNET_YES == client->receive_pending);
1103 client->receive_pending = GNUNET_NO;
1104 now = GNUNET_TIME_absolute_get ();
1105 end = GNUNET_TIME_absolute_add (client->last_activity, client->idle_timeout);
1107 if ((NULL == buf) && (0 == available) && (NULL == addr) && (0 == errCode) &&
1108 (GNUNET_YES != client->shutdown_now) && (NULL != server) &&
1109 (GNUNET_YES == GNUNET_CONNECTION_check (client->connection)) &&
1110 (end.abs_value_us > now.abs_value_us))
1112 /* wait longer, timeout changed (i.e. due to us sending) */
1113 LOG (GNUNET_ERROR_TYPE_DEBUG,
1114 "Receive time out, but no disconnect due to sending (%p)\n",
1115 GNUNET_a2s (addr, addrlen));
1116 client->receive_pending = GNUNET_YES;
1117 GNUNET_CONNECTION_receive (client->connection,
1118 GNUNET_SERVER_MAX_MESSAGE_SIZE - 1,
1119 GNUNET_TIME_absolute_get_remaining (end),
1120 &process_incoming, client);
1123 if ((NULL == buf) || (0 == available) || (0 != errCode) || (NULL == server) ||
1124 (GNUNET_YES == client->shutdown_now) ||
1125 (GNUNET_YES != GNUNET_CONNECTION_check (client->connection)))
1127 /* other side closed connection, error connecting, etc. */
1128 GNUNET_SERVER_client_disconnect (client);
1131 LOG (GNUNET_ERROR_TYPE_DEBUG, "Server receives %u bytes from `%s'.\n",
1132 (unsigned int) available, GNUNET_a2s (addr, addrlen));
1133 GNUNET_SERVER_client_keep (client);
1134 client->last_activity = now;
1136 if (NULL != server->mst_receive)
1138 client->server->mst_receive (client->server->mst_cls, client->mst,
1139 client, buf, available, GNUNET_NO, GNUNET_YES);
1140 else if (NULL != client->mst)
1143 GNUNET_SERVER_mst_receive (client->mst, client, buf, available, GNUNET_NO,
1152 process_mst (client, ret);
1153 GNUNET_SERVER_client_drop (client);
1158 * Task run to start again receiving from the network
1159 * and process requests.
1161 * @param cls our 'struct GNUNET_SERVER_Client*' to process more requests from
1162 * @param tc scheduler context (unused)
1165 restart_processing (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1167 struct GNUNET_SERVER_Client *client = cls;
1169 GNUNET_assert (GNUNET_YES != client->shutdown_now);
1170 client->restart_task = GNUNET_SCHEDULER_NO_TASK;
1171 if (GNUNET_NO == client->receive_pending)
1173 LOG (GNUNET_ERROR_TYPE_DEBUG, "Server begins to read again from client.\n");
1174 client->receive_pending = GNUNET_YES;
1175 GNUNET_CONNECTION_receive (client->connection,
1176 GNUNET_SERVER_MAX_MESSAGE_SIZE - 1,
1177 client->idle_timeout, &process_incoming, client);
1180 LOG (GNUNET_ERROR_TYPE_DEBUG,
1181 "Server continues processing messages still in the buffer.\n");
1182 GNUNET_SERVER_client_keep (client);
1183 client->receive_pending = GNUNET_NO;
1184 process_mst (client, GNUNET_NO);
1185 GNUNET_SERVER_client_drop (client);
1190 * This function is called whenever our inbound message tokenizer has
1191 * received a complete message.
1193 * @param cls closure (struct GNUNET_SERVER_Handle)
1194 * @param client identification of the client (struct GNUNET_SERVER_Client*)
1195 * @param message the actual message
1197 * @return #GNUNET_OK on success, #GNUNET_SYSERR to stop further processing
1200 client_message_tokenizer_callback (void *cls, void *client,
1201 const struct GNUNET_MessageHeader *message)
1203 struct GNUNET_SERVER_Handle *server = cls;
1204 struct GNUNET_SERVER_Client *sender = client;
1207 LOG (GNUNET_ERROR_TYPE_DEBUG,
1208 "Tokenizer gives server message of type %u from client\n",
1209 ntohs (message->type));
1210 sender->in_process_client_buffer = GNUNET_YES;
1211 ret = GNUNET_SERVER_inject (server, sender, message);
1212 sender->in_process_client_buffer = GNUNET_NO;
1213 if ( (GNUNET_OK != ret) || (GNUNET_YES == sender->shutdown_now) )
1215 GNUNET_SERVER_client_disconnect (sender);
1216 return GNUNET_SYSERR;
1223 * Add a TCP socket-based connection to the set of handles managed by
1224 * this server. Use this function for outgoing (P2P) connections that
1225 * we initiated (and where this server should process incoming
1228 * @param server the server to use
1229 * @param connection the connection to manage (client must
1230 * stop using this connection from now on)
1231 * @return the client handle (client should call
1232 * "client_drop" on the return value eventually)
1234 struct GNUNET_SERVER_Client *
1235 GNUNET_SERVER_connect_socket (struct GNUNET_SERVER_Handle *server,
1236 struct GNUNET_CONNECTION_Handle *connection)
1238 struct GNUNET_SERVER_Client *client;
1239 struct NotifyList *n;
1241 client = GNUNET_new (struct GNUNET_SERVER_Client);
1242 client->connection = connection;
1243 client->reference_count = 1;
1244 client->server = server;
1245 client->last_activity = GNUNET_TIME_absolute_get ();
1246 client->idle_timeout = server->idle_timeout;
1247 GNUNET_CONTAINER_DLL_insert (server->clients_head,
1248 server->clients_tail,
1250 if (NULL != server->mst_create)
1252 server->mst_create (server->mst_cls, client);
1255 GNUNET_SERVER_mst_create (&client_message_tokenizer_callback, server);
1256 GNUNET_assert (NULL != client->mst);
1257 for (n = server->connect_notify_list_head; NULL != n; n = n->next)
1258 n->callback (n->callback_cls, client);
1260 client->receive_pending = GNUNET_YES;
1261 GNUNET_CONNECTION_receive (client->connection,
1262 GNUNET_SERVER_MAX_MESSAGE_SIZE - 1,
1263 client->idle_timeout, &process_incoming, client);
1269 * Change the timeout for a particular client. Decreasing the timeout
1270 * may not go into effect immediately (only after the previous timeout
1271 * times out or activity happens on the socket).
1273 * @param client the client to update
1274 * @param timeout new timeout for activities on the socket
1277 GNUNET_SERVER_client_set_timeout (struct GNUNET_SERVER_Client *client,
1278 struct GNUNET_TIME_Relative timeout)
1280 client->idle_timeout = timeout;
1285 * Notify the server that the given client handle should
1286 * be kept (keeps the connection up if possible, increments
1287 * the internal reference counter).
1289 * @param client the client to keep
1292 GNUNET_SERVER_client_keep (struct GNUNET_SERVER_Client *client)
1294 client->reference_count++;
1299 * Notify the server that the given client handle is no
1300 * longer required. Decrements the reference counter. If
1301 * that counter reaches zero an inactive connection maybe
1304 * @param client the client to drop
1307 GNUNET_SERVER_client_drop (struct GNUNET_SERVER_Client *client)
1309 GNUNET_assert (client->reference_count > 0);
1310 client->reference_count--;
1311 if ((GNUNET_YES == client->shutdown_now) && (0 == client->reference_count))
1312 GNUNET_SERVER_client_disconnect (client);
1317 * Obtain the network address of the other party.
1319 * @param client the client to get the address for
1320 * @param addr where to store the address
1321 * @param addrlen where to store the length of the address
1322 * @return GNUNET_OK on success
1325 GNUNET_SERVER_client_get_address (struct GNUNET_SERVER_Client *client,
1326 void **addr, size_t * addrlen)
1328 return GNUNET_CONNECTION_get_address (client->connection, addr, addrlen);
1333 * Ask the server to notify us whenever a client disconnects.
1334 * This function is called whenever the actual network connection
1335 * is closed; the reference count may be zero or larger than zero
1338 * @param server the server manageing the clients
1339 * @param callback function to call on disconnect
1340 * @param callback_cls closure for @a callback
1343 GNUNET_SERVER_disconnect_notify (struct GNUNET_SERVER_Handle *server,
1344 GNUNET_SERVER_DisconnectCallback callback,
1347 struct NotifyList *n;
1349 n = GNUNET_new (struct NotifyList);
1350 n->callback = callback;
1351 n->callback_cls = callback_cls;
1352 GNUNET_CONTAINER_DLL_insert (server->disconnect_notify_list_head,
1353 server->disconnect_notify_list_tail,
1359 * Ask the server to notify us whenever a client connects.
1360 * This function is called whenever the actual network connection
1361 * is opened. If the server is destroyed before this
1362 * notification is explicitly cancelled, the 'callback' will
1363 * once be called with a 'client' argument of NULL to indicate
1364 * that the server itself is now gone (and that the callback
1365 * won't be called anymore and also can no longer be cancelled).
1367 * @param server the server manageing the clients
1368 * @param callback function to call on sconnect
1369 * @param callback_cls closure for @a callback
1372 GNUNET_SERVER_connect_notify (struct GNUNET_SERVER_Handle *server,
1373 GNUNET_SERVER_ConnectCallback callback,
1376 struct NotifyList *n;
1378 n = GNUNET_new (struct NotifyList);
1379 n->callback = callback;
1380 n->callback_cls = callback_cls;
1381 GNUNET_CONTAINER_DLL_insert (server->connect_notify_list_head,
1382 server->connect_notify_list_tail,
1388 * Ask the server to stop notifying us whenever a client connects.
1390 * @param server the server manageing the clients
1391 * @param callback function to call on connect
1392 * @param callback_cls closure for @a callback
1395 GNUNET_SERVER_disconnect_notify_cancel (struct GNUNET_SERVER_Handle *server,
1396 GNUNET_SERVER_DisconnectCallback
1397 callback, void *callback_cls)
1399 struct NotifyList *pos;
1401 for (pos = server->disconnect_notify_list_head; NULL != pos; pos = pos->next)
1402 if ((pos->callback == callback) && (pos->callback_cls == callback_cls))
1409 GNUNET_CONTAINER_DLL_remove (server->disconnect_notify_list_head,
1410 server->disconnect_notify_list_tail,
1417 * Ask the server to stop notifying us whenever a client disconnects.
1419 * @param server the server manageing the clients
1420 * @param callback function to call on disconnect
1421 * @param callback_cls closure for @a callback
1424 GNUNET_SERVER_connect_notify_cancel (struct GNUNET_SERVER_Handle *server,
1425 GNUNET_SERVER_ConnectCallback callback,
1428 struct NotifyList *pos;
1430 for (pos = server->connect_notify_list_head; NULL != pos; pos = pos->next)
1431 if ((pos->callback == callback) && (pos->callback_cls == callback_cls))
1438 GNUNET_CONTAINER_DLL_remove (server->connect_notify_list_head,
1439 server->connect_notify_list_tail,
1446 * Destroy the connection that is passed in via @a cls. Used
1447 * as calling #GNUNET_CONNECTION_destroy from within a function
1448 * that was itself called from within 'process_notify' of
1449 * 'connection.c' is not allowed (see #2329).
1451 * @param cls connection to destroy
1452 * @param tc scheduler context (unused)
1455 destroy_connection (void *cls,
1456 const struct GNUNET_SCHEDULER_TaskContext *tc)
1458 struct GNUNET_CONNECTION_Handle *connection = cls;
1460 GNUNET_CONNECTION_destroy (connection);
1465 * Ask the server to disconnect from the given client.
1466 * This is the same as returning #GNUNET_SYSERR from a message
1467 * handler, except that it allows dropping of a client even
1468 * when not handling a message from that client.
1470 * @param client the client to disconnect from
1473 GNUNET_SERVER_client_disconnect (struct GNUNET_SERVER_Client *client)
1475 struct GNUNET_SERVER_Handle *server = client->server;
1476 struct NotifyList *n;
1478 LOG (GNUNET_ERROR_TYPE_DEBUG,
1479 "Client is being disconnected from the server.\n");
1480 if (GNUNET_SCHEDULER_NO_TASK != client->restart_task)
1482 GNUNET_SCHEDULER_cancel (client->restart_task);
1483 client->restart_task = GNUNET_SCHEDULER_NO_TASK;
1485 if (GNUNET_SCHEDULER_NO_TASK != client->warn_task)
1487 GNUNET_SCHEDULER_cancel (client->warn_task);
1488 client->warn_task = GNUNET_SCHEDULER_NO_TASK;
1490 if (GNUNET_YES == client->receive_pending)
1492 GNUNET_CONNECTION_receive_cancel (client->connection);
1493 client->receive_pending = GNUNET_NO;
1495 client->shutdown_now = GNUNET_YES;
1496 client->reference_count++; /* make sure nobody else clean up client... */
1497 if ( (NULL != client->mst) &&
1500 GNUNET_CONTAINER_DLL_remove (server->clients_head,
1501 server->clients_tail,
1503 if (NULL != server->mst_destroy)
1504 server->mst_destroy (server->mst_cls, client->mst);
1506 GNUNET_SERVER_mst_destroy (client->mst);
1508 for (n = server->disconnect_notify_list_head; NULL != n; n = n->next)
1509 n->callback (n->callback_cls, client);
1511 client->reference_count--;
1512 if (client->reference_count > 0)
1514 LOG (GNUNET_ERROR_TYPE_DEBUG,
1515 "RC still positive, not destroying everything.\n");
1516 client->server = NULL;
1519 if (GNUNET_YES == client->in_process_client_buffer)
1521 LOG (GNUNET_ERROR_TYPE_DEBUG,
1522 "Still processing inputs, not destroying everything.\n");
1525 if (GNUNET_YES == client->persist)
1526 GNUNET_CONNECTION_persist_ (client->connection);
1527 if (NULL != client->th.cth)
1528 GNUNET_SERVER_notify_transmit_ready_cancel (&client->th);
1529 (void) GNUNET_SCHEDULER_add_now (&destroy_connection,
1530 client->connection);
1531 /* need to cancel again, as it might have been re-added
1532 in the meantime (i.e. during callbacks) */
1533 if (GNUNET_SCHEDULER_NO_TASK != client->warn_task)
1535 GNUNET_SCHEDULER_cancel (client->warn_task);
1536 client->warn_task = GNUNET_SCHEDULER_NO_TASK;
1538 if (GNUNET_YES == client->receive_pending)
1540 GNUNET_CONNECTION_receive_cancel (client->connection);
1541 client->receive_pending = GNUNET_NO;
1543 GNUNET_free (client);
1544 /* we might be in soft-shutdown, test if we're done */
1546 test_monitor_clients (server);
1551 * Disable the "CORK" feature for communication with the given client,
1552 * forcing the OS to immediately flush the buffer on transmission
1553 * instead of potentially buffering multiple messages.
1555 * @param client handle to the client
1556 * @return GNUNET_OK on success
1559 GNUNET_SERVER_client_disable_corking (struct GNUNET_SERVER_Client *client)
1561 return GNUNET_CONNECTION_disable_corking (client->connection);
1566 * Wrapper for transmission notification that calls the original
1567 * callback and update the last activity time for our connection.
1569 * @param cls the 'struct GNUNET_SERVER_Client'
1570 * @param size number of bytes we can transmit
1571 * @param buf where to copy the message
1572 * @return number of bytes actually transmitted
1575 transmit_ready_callback_wrapper (void *cls, size_t size, void *buf)
1577 struct GNUNET_SERVER_Client *client = cls;
1578 GNUNET_CONNECTION_TransmitReadyNotify callback;
1580 client->th.cth = NULL;
1581 callback = client->th.callback;
1582 client->th.callback = NULL;
1583 client->last_activity = GNUNET_TIME_absolute_get ();
1584 return callback (client->th.callback_cls, size, buf);
1589 * Notify us when the server has enough space to transmit
1590 * a message of the given size to the given client.
1592 * @param client client to transmit message to
1593 * @param size requested amount of buffer space
1594 * @param timeout after how long should we give up (and call
1595 * notify with buf NULL and size 0)?
1596 * @param callback function to call when space is available
1597 * @param callback_cls closure for @a callback
1598 * @return non-NULL if the notify callback was queued; can be used
1599 * to cancel the request using
1600 * #GNUNET_SERVER_notify_transmit_ready_cancel.
1601 * NULL if we are already going to notify someone else (busy)
1603 struct GNUNET_SERVER_TransmitHandle *
1604 GNUNET_SERVER_notify_transmit_ready (struct GNUNET_SERVER_Client *client,
1606 struct GNUNET_TIME_Relative timeout,
1607 GNUNET_CONNECTION_TransmitReadyNotify
1608 callback, void *callback_cls)
1610 if (NULL != client->th.callback)
1612 client->th.callback_cls = callback_cls;
1613 client->th.callback = callback;
1614 client->th.cth = GNUNET_CONNECTION_notify_transmit_ready (client->connection, size,
1616 &transmit_ready_callback_wrapper,
1623 * Abort transmission request.
1625 * @param th request to abort
1628 GNUNET_SERVER_notify_transmit_ready_cancel (struct GNUNET_SERVER_TransmitHandle *th)
1630 GNUNET_CONNECTION_notify_transmit_ready_cancel (th->cth);
1632 th->callback = NULL;
1637 * Set the persistent flag on this client, used to setup client connection
1638 * to only be killed when the service it's connected to is actually dead.
1640 * @param client the client to set the persistent flag on
1643 GNUNET_SERVER_client_persist_ (struct GNUNET_SERVER_Client *client)
1645 client->persist = GNUNET_YES;
1650 * Resume receiving from this client, we are done processing the
1651 * current request. This function must be called from within each
1652 * GNUNET_SERVER_MessageCallback (or its respective continuations).
1654 * @param client client we were processing a message of
1655 * @param success #GNUNET_OK to keep the connection open and
1656 * continue to receive
1657 * #GNUNET_NO to close the connection (normal behavior)
1658 * #GNUNET_SYSERR to close the connection (signal
1662 GNUNET_SERVER_receive_done (struct GNUNET_SERVER_Client *client,
1667 GNUNET_assert (client->suspended > 0);
1668 client->suspended--;
1669 if (GNUNET_OK != success)
1671 LOG (GNUNET_ERROR_TYPE_DEBUG,
1672 "GNUNET_SERVER_receive_done called with failure indication\n");
1673 if ( (client->reference_count > 0) || (client->suspended > 0) )
1674 client->shutdown_now = GNUNET_YES;
1676 GNUNET_SERVER_client_disconnect (client);
1679 if (client->suspended > 0)
1681 LOG (GNUNET_ERROR_TYPE_DEBUG,
1682 "GNUNET_SERVER_receive_done called, but more clients pending\n");
1685 if (GNUNET_SCHEDULER_NO_TASK != client->warn_task)
1687 GNUNET_SCHEDULER_cancel (client->warn_task);
1688 client->warn_task = GNUNET_SCHEDULER_NO_TASK;
1690 if (GNUNET_YES == client->in_process_client_buffer)
1692 LOG (GNUNET_ERROR_TYPE_DEBUG,
1693 "GNUNET_SERVER_receive_done called while still in processing loop\n");
1696 if ((NULL == client->server) || (GNUNET_YES == client->shutdown_now))
1698 GNUNET_SERVER_client_disconnect (client);
1701 LOG (GNUNET_ERROR_TYPE_DEBUG,
1702 "GNUNET_SERVER_receive_done causes restart in reading from the socket\n");
1703 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK == client->restart_task);
1704 client->restart_task = GNUNET_SCHEDULER_add_now (&restart_processing, client);
1708 /* end of server.c */