2 This file is part of GNUnet.
3 (C) 2009 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 2, 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
27 * - fix inefficient memmove in message processing
31 #include "gnunet_common.h"
32 #include "gnunet_connection_lib.h"
33 #include "gnunet_scheduler_lib.h"
34 #include "gnunet_server_lib.h"
35 #include "gnunet_time_lib.h"
36 #include "gnunet_disk_lib.h"
38 #define DEBUG_SERVER GNUNET_NO
41 * List of arrays of message handlers.
46 * This is a linked list.
48 struct HandlerList *next;
51 * NULL-terminated array of handlers.
53 const struct GNUNET_SERVER_MessageHandler *handlers;
58 * List of arrays of message handlers.
63 * This is a linked list.
65 struct NotifyList *next;
70 GNUNET_SERVER_DisconnectCallback callback;
73 * Closure for callback.
80 * @brief handle for a server
82 struct GNUNET_SERVER_Handle
87 struct GNUNET_SCHEDULER_Handle *sched;
90 * List of handlers for incoming messages.
92 struct HandlerList *handlers;
95 * List of our current clients.
97 struct GNUNET_SERVER_Client *clients;
100 * Linked list of functions to call on disconnects by clients.
102 struct NotifyList *disconnect_notify_list;
105 * Function to call for access control.
107 GNUNET_CONNECTION_AccessCheck access;
110 * Closure for access.
115 * After how long should an idle connection time
118 struct GNUNET_TIME_Relative idle_timeout;
121 * maximum write buffer size for accepted sockets
126 * Pipe used to signal shutdown of the server.
128 struct GNUNET_DISK_PipeHandle *shutpipe;
131 * Socket used to listen for new connections. Set to
132 * "-1" by GNUNET_SERVER_destroy to initiate shutdown.
134 struct GNUNET_NETWORK_Handle *listen_socket;
137 * Set to GNUNET_YES if we are shutting down.
142 * Do we ignore messages of types that we do not
143 * understand or do we require that a handler
144 * is found (and if not kill the connection)?
152 * @brief handle for a client of the server
154 struct GNUNET_SERVER_Client
158 * Size of the buffer for incoming data. Should be
159 * first so we get nice alignment.
161 char incoming_buffer[GNUNET_SERVER_MAX_MESSAGE_SIZE];
164 * This is a linked list.
166 struct GNUNET_SERVER_Client *next;
169 * Server that this client belongs to.
171 struct GNUNET_SERVER_Handle *server;
174 * Client closure for callbacks.
176 void *client_closure;
179 * Callback to receive from client.
181 GNUNET_SERVER_ReceiveCallback receive;
184 * Callback to cancel receive from client.
186 GNUNET_SERVER_ReceiveCancelCallback receive_cancel;
189 * Callback to ask about transmit-ready notification.
191 GNUNET_SERVER_TransmitReadyCallback notify_transmit_ready;
194 * Callback to ask about transmit-ready notification.
196 GNUNET_SERVER_TransmitReadyCancelCallback notify_transmit_ready_cancel;
199 * Callback to check if client is still valid.
201 GNUNET_SERVER_CheckCallback check;
204 * Callback to destroy client.
206 GNUNET_SERVER_DestroyCallback destroy;
209 * Side-buffer for incoming data used when processing
215 * Number of bytes in the side buffer.
217 size_t side_buf_size;
220 * Last activity on this socket (used to time it out
221 * if reference_count == 0).
223 struct GNUNET_TIME_Absolute last_activity;
226 * How many bytes in the "incoming_buffer" are currently
227 * valid? (starting at offset 0).
232 * Number of external entities with a reference to
233 * this client object.
235 unsigned int reference_count;
238 * Was processing if incoming messages suspended while
239 * we were still processing data already received?
240 * This is a counter saying how often processing was
241 * suspended (once per handler invoked).
243 unsigned int suspended;
246 * Are we currently in the "process_client_buffer" function (and
247 * will hence restart the receive job on exit if suspended == 0 once
248 * we are done?). If this is set, then "receive_done" will
249 * essentially only decrement suspended; if this is not set, then
250 * "receive_done" may need to restart the receive process (either
251 * from the side-buffer or via select/recv).
253 int in_process_client_buffer;
256 * We're about to close down this client due to some serious
265 * Server has been asked to shutdown, free resources.
268 destroy_server (struct GNUNET_SERVER_Handle *server)
270 struct GNUNET_SERVER_Client *pos;
271 struct HandlerList *hpos;
272 struct NotifyList *npos;
275 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
276 "Server shutting down.\n");
278 GNUNET_assert (server->listen_socket == NULL);
279 if (GNUNET_OK != GNUNET_DISK_pipe_close (server->shutpipe))
280 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING,
282 while (server->clients != NULL)
284 pos = server->clients;
285 server->clients = pos->next;
288 while (NULL != (hpos = server->handlers))
290 server->handlers = hpos->next;
293 while (NULL != (npos = server->disconnect_notify_list))
295 server->disconnect_notify_list = npos->next;
298 GNUNET_free (server);
303 * Scheduler says our listen socket is ready.
307 process_listen_socket (void *cls,
308 const struct GNUNET_SCHEDULER_TaskContext *tc)
310 struct GNUNET_SERVER_Handle *server = cls;
311 struct GNUNET_CONNECTION_Handle *sock;
312 struct GNUNET_SERVER_Client *client;
313 struct GNUNET_NETWORK_FDSet *r;
314 const struct GNUNET_DISK_FileHandle *shutpipe;
316 if ((server->do_shutdown) ||
317 ((tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0))
319 /* shutdown was initiated */
320 GNUNET_assert (server->listen_socket != NULL);
321 GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (server->listen_socket));
322 server->listen_socket = NULL;
323 if (server->do_shutdown)
324 destroy_server (server);
327 shutpipe = GNUNET_DISK_pipe_handle (server->shutpipe,
328 GNUNET_DISK_PIPE_END_READ);
329 GNUNET_assert (GNUNET_NETWORK_fdset_isset (tc->read_ready, server->listen_socket));
330 GNUNET_assert (!GNUNET_NETWORK_fdset_handle_isset (tc->read_ready, shutpipe));
331 sock = GNUNET_CONNECTION_create_from_accept (tc->sched,
334 server->listen_socket,
339 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
340 "Server accepted incoming connection.\n");
342 client = GNUNET_SERVER_connect_socket (server, sock);
343 /* decrement reference count, we don't keep "client" alive */
344 GNUNET_SERVER_client_drop (client);
346 /* listen for more! */
347 r = GNUNET_NETWORK_fdset_create ();
348 GNUNET_NETWORK_fdset_set (r, server->listen_socket);
349 GNUNET_NETWORK_fdset_handle_set (r, shutpipe);
350 GNUNET_SCHEDULER_add_select (server->sched,
352 GNUNET_SCHEDULER_PRIORITY_HIGH,
353 GNUNET_SCHEDULER_NO_TASK,
354 GNUNET_TIME_UNIT_FOREVER_REL,
356 &process_listen_socket, server);
357 GNUNET_NETWORK_fdset_destroy (r);
362 * Create and initialize a listen socket for the server.
364 * @return NULL on error, otherwise the listen socket
366 static struct GNUNET_NETWORK_Handle *
367 open_listen_socket (const struct sockaddr *serverAddr, socklen_t socklen)
369 const static int on = 1;
370 struct GNUNET_NETWORK_Handle *sock;
373 switch (serverAddr->sa_family)
376 port = ntohs (((const struct sockaddr_in *) serverAddr)->sin_port);
379 port = ntohs (((const struct sockaddr_in6 *) serverAddr)->sin6_port);
385 sock = GNUNET_NETWORK_socket_socket (serverAddr->sa_family, SOCK_STREAM, 0);
388 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "socket");
392 if (GNUNET_OK != GNUNET_NETWORK_socket_set_inheritable (sock))
393 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
396 if (GNUNET_NETWORK_socket_setsockopt (sock, SOL_SOCKET, SO_REUSEADDR, &on, sizeof (on)) != GNUNET_OK)
397 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
399 /* bind the socket */
400 if (GNUNET_NETWORK_socket_bind (sock, serverAddr, socklen) != GNUNET_OK)
402 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "bind");
403 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
405 ("`%s' failed for port %d. Is the service already running?\n"),
407 GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (sock));
410 if (GNUNET_OK != GNUNET_NETWORK_socket_listen (sock, 5))
412 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "listen");
413 GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (sock));
417 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
418 "Server starts to listen on port %u.\n",
426 * Create a new server.
428 * @param sched scheduler to use
429 * @param access function for access control
430 * @param access_cls closure for access
431 * @param serverAddr address to listen on (including port), use NULL
432 * for internal server (no listening)
433 * @param socklen length of serverAddr
434 * @param maxbuf maximum write buffer size for accepted sockets
435 * @param idle_timeout after how long should we timeout idle connections?
436 * @param require_found if YES, connections sending messages of unknown type
438 * @return handle for the new server, NULL on error
439 * (typically, "port" already in use)
441 struct GNUNET_SERVER_Handle *
442 GNUNET_SERVER_create (struct GNUNET_SCHEDULER_Handle *sched,
443 GNUNET_CONNECTION_AccessCheck access,
445 const struct sockaddr *serverAddr,
448 struct GNUNET_TIME_Relative
449 idle_timeout, int require_found)
451 struct GNUNET_SERVER_Handle *ret;
452 struct GNUNET_NETWORK_Handle *lsock;
453 struct GNUNET_NETWORK_FDSet *r;
456 if (serverAddr != NULL)
458 lsock = open_listen_socket (serverAddr, socklen);
462 ret = GNUNET_malloc (sizeof (struct GNUNET_SERVER_Handle));
463 if (NULL == (ret->shutpipe = GNUNET_DISK_pipe (GNUNET_NO)))
465 GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (lsock));
470 ret->maxbuf = maxbuf;
471 ret->idle_timeout = idle_timeout;
472 ret->listen_socket = lsock;
473 ret->access = access;
474 ret->access_cls = access_cls;
475 ret->require_found = require_found;
478 r = GNUNET_NETWORK_fdset_create ();
479 GNUNET_NETWORK_fdset_set (r, ret->listen_socket);
480 GNUNET_NETWORK_fdset_handle_set (r, GNUNET_DISK_pipe_handle (ret->shutpipe,
481 GNUNET_DISK_PIPE_END_READ));
482 GNUNET_SCHEDULER_add_select (sched,
484 GNUNET_SCHEDULER_PRIORITY_HIGH,
485 GNUNET_SCHEDULER_NO_TASK,
486 GNUNET_TIME_UNIT_FOREVER_REL,
488 NULL, &process_listen_socket, ret);
489 GNUNET_NETWORK_fdset_destroy (r);
496 * Free resources held by this server.
499 GNUNET_SERVER_destroy (struct GNUNET_SERVER_Handle *s)
503 GNUNET_assert (s->do_shutdown == GNUNET_NO);
504 s->do_shutdown = GNUNET_YES;
505 if (s->listen_socket == NULL)
508 GNUNET_break (1 == GNUNET_DISK_file_write (GNUNET_DISK_pipe_handle (s->shutpipe,
509 GNUNET_DISK_PIPE_END_WRITE),
516 * Add additional handlers to an existing server.
518 * @param server the server to add handlers to
519 * @param handlers array of message handlers for
520 * incoming messages; the last entry must
521 * have "NULL" for the "callback"; multiple
522 * entries for the same type are allowed,
523 * they will be called in order of occurence.
524 * These handlers can be removed later;
525 * the handlers array must exist until removed
526 * (or server is destroyed).
529 GNUNET_SERVER_add_handlers (struct GNUNET_SERVER_Handle *server,
530 const struct GNUNET_SERVER_MessageHandler
533 struct HandlerList *p;
535 p = GNUNET_malloc (sizeof (struct HandlerList));
536 p->handlers = handlers;
537 p->next = server->handlers;
538 server->handlers = p;
543 * Inject a message into the server, pretend it came
544 * from the specified client. Delivery of the message
545 * will happen instantly (if a handler is installed;
546 * otherwise the call does nothing).
548 * @param server the server receiving the message
549 * @param sender the "pretended" sender of the message
551 * @param message message to transmit
552 * @return GNUNET_OK if the message was OK and the
553 * connection can stay open
554 * GNUNET_SYSERR if the connection to the
555 * client should be shut down
558 GNUNET_SERVER_inject (struct GNUNET_SERVER_Handle *server,
559 struct GNUNET_SERVER_Client *sender,
560 const struct GNUNET_MessageHeader *message)
562 struct HandlerList *pos;
563 const struct GNUNET_SERVER_MessageHandler *mh;
569 type = ntohs (message->type);
570 size = ntohs (message->size);
572 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
573 "Server schedules transmission of %u-byte message of type %u to client.\n",
577 pos = server->handlers;
582 while (pos->handlers[i].callback != NULL)
584 mh = &pos->handlers[i];
585 if (mh->type == type)
587 if ((mh->expected_size != 0) && (mh->expected_size != size))
590 return GNUNET_SYSERR;
594 mh->callback (mh->callback_cls, sender, message);
601 if (found == GNUNET_NO)
603 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
604 _("Received message of unknown type %d\n"), type);
605 if (server->require_found == GNUNET_YES)
606 return GNUNET_SYSERR;
613 * We're finished with this client and especially its input
614 * processing. If the RC is zero, free all resources otherwise wait
615 * until RC hits zero to do so.
618 shutdown_incoming_processing (struct GNUNET_SERVER_Client *client)
620 struct GNUNET_SERVER_Client *prev;
621 struct GNUNET_SERVER_Client *pos;
622 struct GNUNET_SERVER_Handle *server;
623 struct NotifyList *n;
626 rc = client->reference_count;
627 if (client->server != NULL)
629 server = client->server;
630 client->server = NULL;
632 pos = server->clients;
633 while ((pos != NULL) && (pos != client))
638 GNUNET_assert (pos != NULL);
640 server->clients = pos->next;
642 prev->next = pos->next;
643 n = server->disconnect_notify_list;
646 n->callback (n->callback_cls, client);
650 /* wait for RC to hit zero, then free */
653 client->destroy (client->client_closure);
654 GNUNET_free (client);
659 * Go over the contents of the client buffer; as long as full messages
660 * are available, pass them on for processing. Update the buffer
661 * accordingly. Handles fatal errors by shutting down the connection.
663 * @param client identifies which client receive buffer to process
666 process_client_buffer (struct GNUNET_SERVER_Client *client)
668 struct GNUNET_SERVER_Handle *server;
669 const struct GNUNET_MessageHeader *hdr;
672 client->in_process_client_buffer = GNUNET_YES;
673 server = client->server;
675 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
676 "Private buffer contains %u bytes; client is %s and we are %s\n",
678 client->suspended ? "suspended" : "up",
679 client->shutdown_now ? "in shutdown" : "running");
681 while ((client->receive_pos >= sizeof (struct GNUNET_MessageHeader)) &&
682 (0 == client->suspended) && (GNUNET_YES != client->shutdown_now))
684 hdr = (const struct GNUNET_MessageHeader *) &client->incoming_buffer;
685 msize = ntohs (hdr->size);
686 if (msize > client->receive_pos)
689 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
690 "Total message size is %u, we only have %u bytes; need more data\n",
692 client->receive_pos);
697 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
698 "Passing %u bytes to callback for processing\n",
701 if ((msize < sizeof (struct GNUNET_MessageHeader)) ||
702 (GNUNET_OK != GNUNET_SERVER_inject (server, client, hdr)))
704 client->in_process_client_buffer = GNUNET_NO;
705 shutdown_incoming_processing (client);
708 /* FIXME: this is highly inefficient; we should
709 try to avoid this if the new base address is
710 already nicely aligned. See old handler code... */
711 memmove (client->incoming_buffer,
712 &client->incoming_buffer[msize], client->receive_pos - msize);
713 client->receive_pos -= msize;
715 client->in_process_client_buffer = GNUNET_NO;
716 if (GNUNET_YES == client->shutdown_now)
717 shutdown_incoming_processing (client);
722 * We are receiving an incoming message. Process it.
724 * @param cls our closure (handle for the client)
725 * @param buf buffer with data received from network
726 * @param available number of bytes available in buf
727 * @param addr address of the sender
728 * @param addrlen length of addr
729 * @param errCode code indicating errors receiving, 0 for success
732 process_incoming (void *cls,
735 const struct sockaddr *addr,
739 struct GNUNET_SERVER_Client *client = cls;
740 struct GNUNET_SERVER_Handle *server = client->server;
741 const char *cbuf = buf;
748 (client->shutdown_now == GNUNET_YES) ||
749 (GNUNET_YES != client->check (client->client_closure)))
751 /* other side closed connection, error connecting, etc. */
752 shutdown_incoming_processing (client);
756 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
757 "Server receives %u bytes from `%s'.\n",
759 GNUNET_a2s(addr, addrlen));
761 GNUNET_SERVER_client_keep (client);
762 client->last_activity = GNUNET_TIME_absolute_get ();
763 /* process data (if available) */
764 while (available > 0)
767 if (maxcpy > sizeof (client->incoming_buffer) - client->receive_pos)
768 maxcpy = sizeof (client->incoming_buffer) - client->receive_pos;
770 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
771 "Can copy %u bytes to private buffer\n",
774 memcpy (&client->incoming_buffer[client->receive_pos], cbuf, maxcpy);
775 client->receive_pos += maxcpy;
778 if (0 < client->suspended)
783 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
784 "Client has suspended processing; copying %u bytes to side buffer to be used later.\n",
787 GNUNET_assert (client->side_buf_size == 0);
788 GNUNET_assert (client->side_buf == NULL);
789 client->side_buf_size = available;
790 client->side_buf = GNUNET_malloc (available);
791 memcpy (client->side_buf, cbuf, available);
794 break; /* do not run next client iteration! */
797 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
798 "Now processing messages in private buffer\n");
800 process_client_buffer (client);
802 GNUNET_assert (available == 0);
803 if ((client->suspended == 0) &&
804 (GNUNET_YES != client->shutdown_now) && (client->server != NULL))
806 /* Finally, keep receiving! */
807 client->receive (client->client_closure,
808 GNUNET_SERVER_MAX_MESSAGE_SIZE,
809 server->idle_timeout,
810 &process_incoming, client);
812 if (GNUNET_YES == client->shutdown_now)
813 shutdown_incoming_processing (client);
814 GNUNET_SERVER_client_drop (client);
822 restart_processing (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
824 struct GNUNET_SERVER_Client *client = cls;
826 process_client_buffer (client);
827 if (0 == client->suspended)
828 client->receive (client->client_closure,
829 GNUNET_SERVER_MAX_MESSAGE_SIZE,
830 client->server->idle_timeout,
831 &process_incoming, client);
836 * Add a client to the set of our clients and
840 add_client (struct GNUNET_SERVER_Handle *server,
841 struct GNUNET_SERVER_Client *client)
843 client->server = server;
844 client->last_activity = GNUNET_TIME_absolute_get ();
845 client->next = server->clients;
846 server->clients = client;
847 client->receive (client->client_closure,
848 GNUNET_SERVER_MAX_MESSAGE_SIZE,
849 server->idle_timeout,
850 &process_incoming, client);
855 * Create a request for receiving data from a socket.
857 * @param cls identifies the socket to receive from
858 * @param max how much data to read at most
859 * @param timeout when should this operation time out
860 * @param receiver function to call for processing
861 * @param receiver_cls closure for receiver
864 sock_receive (void *cls,
866 struct GNUNET_TIME_Relative timeout,
867 GNUNET_CONNECTION_Receiver receiver, void *receiver_cls)
869 GNUNET_CONNECTION_receive (cls, max, timeout, receiver, receiver_cls);
874 * Wrapper to cancel receiving from a socket.
876 * @param cls handle to the GNUNET_CONNECTION_Handle to cancel
879 sock_receive_cancel (void *cls)
881 GNUNET_CONNECTION_receive_cancel (cls);
889 sock_notify_transmit_ready (void *cls,
891 struct GNUNET_TIME_Relative timeout,
892 GNUNET_CONNECTION_TransmitReadyNotify notify,
895 return GNUNET_CONNECTION_notify_transmit_ready (cls, size, timeout, notify,
904 sock_notify_transmit_ready_cancel (void *cls, void *h)
906 GNUNET_CONNECTION_notify_transmit_ready_cancel (h);
911 * Check if socket is still valid (no fatal errors have happened so far).
913 * @param cls the socket
914 * @return GNUNET_YES if valid, GNUNET_NO otherwise
917 sock_check (void *cls)
919 return GNUNET_CONNECTION_check (cls);
924 * Destroy this socket (free resources).
926 * @param cls the socket
929 sock_destroy (void *cls)
931 GNUNET_CONNECTION_destroy (cls);
936 * Add a TCP socket-based connection to the set of handles managed by
937 * this server. Use this function for outgoing (P2P) connections that
938 * we initiated (and where this server should process incoming
941 * @param server the server to use
942 * @param connection the connection to manage (client must
943 * stop using this connection from now on)
944 * @return the client handle (client should call
945 * "client_drop" on the return value eventually)
947 struct GNUNET_SERVER_Client *
948 GNUNET_SERVER_connect_socket (struct
951 struct GNUNET_CONNECTION_Handle *connection)
953 struct GNUNET_SERVER_Client *client;
955 client = GNUNET_malloc (sizeof (struct GNUNET_SERVER_Client));
956 client->client_closure = connection;
957 client->receive = &sock_receive;
958 client->receive_cancel = &sock_receive_cancel;
959 client->notify_transmit_ready = &sock_notify_transmit_ready;
960 client->notify_transmit_ready_cancel = &sock_notify_transmit_ready_cancel;
961 client->check = &sock_check;
962 client->destroy = &sock_destroy;
963 client->reference_count = 1;
964 add_client (server, client);
970 * Add an arbitrary connection to the set of handles managed by this
971 * server. This can be used if a sending and receiving does not
972 * really go over the network (internal transmission) or for servers
975 * @param server the server to use
976 * @param chandle opaque handle for the connection
977 * @param creceive receive function for the connection
978 * @param ccancel cancel receive function for the connection
979 * @param cnotify transmit notification function for the connection
980 * @param cnotify_cancel transmit notification cancellation function for the connection
981 * @param ccheck function to test if the connection is still up
982 * @param cdestroy function to close and free the connection
983 * @return the client handle (client should call
984 * "client_drop" on the return value eventually)
986 struct GNUNET_SERVER_Client *
987 GNUNET_SERVER_connect_callback (struct
991 GNUNET_SERVER_ReceiveCallback
993 GNUNET_SERVER_ReceiveCancelCallback
995 GNUNET_SERVER_TransmitReadyCallback
997 GNUNET_SERVER_TransmitReadyCancelCallback
999 GNUNET_SERVER_CheckCallback
1001 GNUNET_SERVER_DestroyCallback cdestroy)
1003 struct GNUNET_SERVER_Client *client;
1005 client = GNUNET_malloc (sizeof (struct GNUNET_SERVER_Client));
1006 client->client_closure = chandle;
1007 client->receive = creceive;
1008 client->receive_cancel = ccancel;
1009 client->notify_transmit_ready = cnotify;
1010 client->notify_transmit_ready_cancel = cnotify_cancel;
1011 client->check = ccheck;
1012 client->destroy = cdestroy;
1013 client->reference_count = 1;
1014 add_client (server, client);
1020 * Notify the server that the given client handle should
1021 * be kept (keeps the connection up if possible, increments
1022 * the internal reference counter).
1024 * @param client the client to keep
1027 GNUNET_SERVER_client_keep (struct GNUNET_SERVER_Client *client)
1029 client->reference_count++;
1034 * Notify the server that the given client handle is no
1035 * longer required. Decrements the reference counter. If
1036 * that counter reaches zero an inactive connection maybe
1039 * @param client the client to drop
1042 GNUNET_SERVER_client_drop (struct GNUNET_SERVER_Client *client)
1044 GNUNET_assert (client->reference_count > 0);
1045 client->reference_count--;
1046 if ((client->server == NULL) && (client->reference_count == 0))
1047 shutdown_incoming_processing (client);
1052 * Obtain the network address of the other party.
1054 * @param client the client to get the address for
1055 * @param addr where to store the address
1056 * @param addrlen where to store the length of the address
1057 * @return GNUNET_OK on success
1060 GNUNET_SERVER_client_get_address (struct GNUNET_SERVER_Client *client,
1061 void **addr, size_t * addrlen)
1063 if (client->receive != &sock_receive)
1064 return GNUNET_SYSERR; /* not a network client */
1065 return GNUNET_CONNECTION_get_address (client->client_closure,
1071 * Ask the server to notify us whenever a client disconnects.
1072 * This function is called whenever the actual network connection
1073 * is closed; the reference count may be zero or larger than zero
1076 * @param server the server manageing the clients
1077 * @param callback function to call on disconnect
1078 * @param callback_cls closure for callback
1081 GNUNET_SERVER_disconnect_notify (struct GNUNET_SERVER_Handle *server,
1082 GNUNET_SERVER_DisconnectCallback callback,
1085 struct NotifyList *n;
1087 n = GNUNET_malloc (sizeof (struct NotifyList));
1088 n->callback = callback;
1089 n->callback_cls = callback_cls;
1090 n->next = server->disconnect_notify_list;
1091 server->disconnect_notify_list = n;
1096 * Ask the server to disconnect from the given client.
1097 * This is the same as returning GNUNET_SYSERR from a message
1098 * handler, except that it allows dropping of a client even
1099 * when not handling a message from that client.
1101 * @param client the client to disconnect from
1104 GNUNET_SERVER_client_disconnect (struct GNUNET_SERVER_Client *client)
1106 if (client->server == NULL)
1107 return; /* already disconnected */
1108 client->receive_cancel (client->client_closure);
1109 shutdown_incoming_processing (client);
1114 * Notify us when the server has enough space to transmit
1115 * a message of the given size to the given client.
1117 * @param client client to transmit message to
1118 * @param size requested amount of buffer space
1119 * @param timeout after how long should we give up (and call
1120 * notify with buf NULL and size 0)?
1121 * @param callback function to call when space is available
1122 * @param callback_cls closure for callback
1123 * @return non-NULL if the notify callback was queued; can be used
1124 * to cancel the request using
1125 * GNUNET_CONNECTION_notify_transmit_ready_cancel.
1126 * NULL if we are already going to notify someone else (busy)
1128 struct GNUNET_CONNECTION_TransmitHandle *
1129 GNUNET_SERVER_notify_transmit_ready (struct GNUNET_SERVER_Client *client,
1131 struct GNUNET_TIME_Relative timeout,
1132 GNUNET_CONNECTION_TransmitReadyNotify
1133 callback, void *callback_cls)
1135 return client->notify_transmit_ready (client->client_closure,
1137 timeout, callback, callback_cls);
1142 * Resume receiving from this client, we are done processing the
1143 * current request. This function must be called from within each
1144 * GNUNET_SERVER_MessageCallback (or its respective continuations).
1146 * @param client client we were processing a message of
1147 * @param success GNUNET_OK to keep the connection open and
1148 * continue to receive
1149 * GNUNET_SYSERR to close the connection (signal
1153 GNUNET_SERVER_receive_done (struct GNUNET_SERVER_Client *client, int success)
1159 GNUNET_assert (client->suspended > 0);
1160 client->suspended--;
1161 if (success != GNUNET_OK)
1162 client->shutdown_now = GNUNET_YES;
1163 if (client->suspended > 0)
1165 if (client->in_process_client_buffer == GNUNET_YES)
1167 if (client->side_buf_size > 0)
1169 /* resume processing from side-buf */
1170 sb = client->side_buf;
1171 client->side_buf = NULL;
1172 /* this will also resume the receive job */
1173 if (GNUNET_YES != client->shutdown_now)
1174 process_incoming (client, sb, client->side_buf_size, NULL, 0, 0);
1176 shutdown_incoming_processing (client);
1177 /* finally, free the side-buf */
1181 /* resume receive job */
1182 if (GNUNET_YES != client->shutdown_now)
1184 GNUNET_SCHEDULER_add_continuation (client->server->sched,
1186 &restart_processing,
1188 GNUNET_SCHEDULER_REASON_PREREQ_DONE);
1191 shutdown_incoming_processing (client);
1195 /* end of server.c */