GNUnet  0.11.x
tcp_server_legacy.c
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1 /*
2  This file is part of GNUnet.
3  Copyright (C) 2009-2013 GNUnet e.V.
4 
5  GNUnet is free software: you can redistribute it and/or modify it
6  under the terms of the GNU Affero General Public License as published
7  by the Free Software Foundation, either version 3 of the License,
8  or (at your option) any later version.
9 
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  Affero General Public License for more details.
14 
15  You should have received a copy of the GNU Affero General Public License
16  along with this program. If not, see <http://www.gnu.org/licenses/>.
17 
18  SPDX-License-Identifier: AGPL3.0-or-later
19  */
20 
27 #include "platform.h"
28 #include "gnunet_util_lib.h"
29 #include "gnunet_protocols.h"
30 
31 #define LOG_STRERROR_FILE(kind, syscall, \
32  filename) GNUNET_log_from_strerror_file (kind, \
33  "util-server", \
34  syscall, \
35  filename)
36 
37 
42 {
46  struct HandlerList *next;
47 
52 };
53 
54 
58 struct NotifyList
59 {
63  struct NotifyList *next;
64 
68  struct NotifyList *prev;
69 
74 
78  void *callback_cls;
79 };
80 
81 
86 {
91 
96 
101 
106 
111 
116 
121 
126 
131 
137 
143 
148 
153 
158 
163 
167  void *mst_cls;
168 
174 
183 };
184 
185 
190 {
195 
200 
205 };
206 
207 
212 {
217 
222 
226  void *mst;
227 
232 
237 
243 
248 
253 
258 
264 
270 
276 
281  unsigned int reference_count;
282 
289  unsigned int suspended;
290 
296 
306 
311 
318 
324  int persist;
325 
332 
336  uint16_t warn_type;
337 };
338 
339 
348 void *
350  size_t size)
351 {
352  if ((0 == client->user_context_size) &&
353  (NULL == client->user_context))
354  return NULL; /* never set */
355  GNUNET_assert (size == client->user_context_size);
356  return client->user_context;
357 }
358 
359 
368 void
370  void *ptr,
371  size_t size)
372 {
373  if (NULL == ptr)
374  {
375  client->user_context_size = 0;
376  client->user_context = ptr;
377  return;
378  }
379  client->user_context_size = size;
380  client->user_context = ptr;
381 }
382 
383 
390 static void
392 {
393  struct GNUNET_SERVER_Handle *server = cls;
394  const struct GNUNET_SCHEDULER_TaskContext *tc;
396  unsigned int i;
397 
398  server->listen_task = NULL;
400  for (i = 0; NULL != server->listen_sockets[i]; i++)
401  {
403  server->listen_sockets[i]))
404  {
405  sock =
407  server->access_cb_cls,
408  server->listen_sockets[i]);
409  if (NULL != sock)
410  {
412  "Server accepted incoming connection.\n");
413  (void) GNUNET_SERVER_connect_socket (server,
414  sock);
415  }
416  }
417  }
418  /* listen for more! */
419  GNUNET_SERVER_resume (server);
420 }
421 
422 
430 static struct GNUNET_NETWORK_Handle *
431 open_listen_socket (const struct sockaddr *server_addr,
432  socklen_t socklen)
433 {
434  struct GNUNET_NETWORK_Handle *sock;
435  uint16_t port;
436  int eno;
437 
438  switch (server_addr->sa_family)
439  {
440  case AF_INET:
441  port = ntohs (((const struct sockaddr_in *) server_addr)->sin_port);
442  break;
443 
444  case AF_INET6:
445  port = ntohs (((const struct sockaddr_in6 *) server_addr)->sin6_port);
446  break;
447 
448  case AF_UNIX:
449  port = 0;
450  break;
451 
452  default:
453  GNUNET_break (0);
454  port = 0;
455  break;
456  }
457  sock = GNUNET_NETWORK_socket_create (server_addr->sa_family, SOCK_STREAM, 0);
458  if (NULL == sock)
459  {
461  errno = 0;
462  return NULL;
463  }
464  /* bind the socket */
465  if (GNUNET_OK != GNUNET_NETWORK_socket_bind (sock, server_addr, socklen))
466  {
467  eno = errno;
468  if (EADDRINUSE != errno)
469  {
470  /* we don't log 'EADDRINUSE' here since an IPv4 bind may
471  * fail if we already took the port on IPv6; if both IPv4 and
472  * IPv6 binds fail, then our caller will log using the
473  * errno preserved in 'eno' */
475  "bind");
476  if (0 != port)
478  _ ("`%s' failed for port %d (%s).\n"),
479  "bind",
480  port,
481  (AF_INET == server_addr->sa_family) ? "IPv4" : "IPv6");
482  eno = 0;
483  }
484  else
485  {
486  if (0 != port)
488  _ ("`%s' failed for port %d (%s): address already in use\n"),
489  "bind", port,
490  (AF_INET == server_addr->sa_family) ? "IPv4" : "IPv6");
491  else if (AF_UNIX == server_addr->sa_family)
492  {
494  _ ("`%s' failed for `%s': address already in use\n"),
495  "bind",
496  GNUNET_a2s (server_addr, socklen));
497  }
498  }
500  errno = eno;
501  return NULL;
502  }
503  if (GNUNET_OK != GNUNET_NETWORK_socket_listen (sock, 5))
504  {
506  "listen");
508  errno = 0;
509  return NULL;
510  }
511  if (0 != port)
513  "Server starts to listen on port %u.\n",
514  port);
515  return sock;
516 }
517 
518 
531 struct GNUNET_SERVER_Handle *
533  void *access_cb_cls,
534  struct GNUNET_NETWORK_Handle **lsocks,
536  int require_found)
537 {
538  struct GNUNET_SERVER_Handle *server;
539 
540  server = GNUNET_new (struct GNUNET_SERVER_Handle);
541  server->idle_timeout = idle_timeout;
542  server->listen_sockets = lsocks;
543  server->access_cb = access_cb;
544  server->access_cb_cls = access_cb_cls;
545  server->require_found = require_found;
546  if (NULL != lsocks)
547  GNUNET_SERVER_resume (server);
548  return server;
549 }
550 
551 
565 struct GNUNET_SERVER_Handle *
567  void *access_cb_cls,
568  struct sockaddr *const *server_addr,
569  const socklen_t *socklen,
571  int require_found)
572 {
573  struct GNUNET_NETWORK_Handle **lsocks;
574  unsigned int i;
575  unsigned int j;
576  unsigned int k;
577  int seen;
578 
579  i = 0;
580  while (NULL != server_addr[i])
581  i++;
582  if (i > 0)
583  {
584  lsocks = GNUNET_malloc (sizeof(struct GNUNET_NETWORK_Handle *) * (i + 1));
585  i = 0;
586  j = 0;
587  while (NULL != server_addr[i])
588  {
589  seen = 0;
590  for (k = 0; k < i; k++)
591  if ((socklen[k] == socklen[i]) &&
592  (0 == memcmp (server_addr[k], server_addr[i], socklen[i])))
593  {
594  seen = 1;
595  break;
596  }
597  if (0 != seen)
598  {
599  /* duplicate address, skip */
600  i++;
601  continue;
602  }
603  lsocks[j] = open_listen_socket (server_addr[i], socklen[i]);
604  if (NULL != lsocks[j])
605  j++;
606  i++;
607  }
608  if (0 == j)
609  {
610  if (0 != errno)
612  GNUNET_free (lsocks);
613  lsocks = NULL;
614  }
615  }
616  else
617  {
618  lsocks = NULL;
619  }
620  return GNUNET_SERVER_create_with_sockets (access_cb,
621  access_cb_cls,
622  lsocks,
623  idle_timeout,
624  require_found);
625 }
626 
627 
640 void
642 {
644  "Marking client as monitor!\n");
645  client->is_monitor = GNUNET_YES;
646 }
647 
648 
655 static void
656 do_destroy (void *cls)
657 {
658  struct GNUNET_SERVER_Handle *server = cls;
659 
660  GNUNET_SERVER_destroy (server);
661 }
662 
663 
670 static void
672 {
673  struct GNUNET_SERVER_Client *client;
674 
676  return;
677  for (client = server->clients_head; NULL != client; client = client->next)
678  if (GNUNET_NO == client->is_monitor)
679  return;
680  /* not done yet */
683 }
684 
685 
691 void
693 {
694  if (NULL != server->listen_task)
695  {
697  server->listen_task = NULL;
698  }
699 }
700 
701 
707 void
709 {
710  struct GNUNET_NETWORK_FDSet *r;
711  unsigned int i;
712 
713  if (NULL == server->listen_sockets)
714  return;
715  if (NULL == server->listen_sockets[0])
716  return; /* nothing to do, no listen sockets! */
717  if (NULL == server->listen_sockets[1])
718  {
719  /* simplified method: no fd set needed; this is then much simpler
720  and much more efficient */
721  server->listen_task =
724  server->listen_sockets[0],
726  server);
727  return;
728  }
730  i = 0;
731  while (NULL != server->listen_sockets[i])
732  GNUNET_NETWORK_fdset_set (r, server->listen_sockets[i++]);
733  server->listen_task =
736  &process_listen_socket, server);
738 }
739 
740 
747 void
749 {
750  unsigned int i;
751 
753  "Server in soft shutdown\n");
754  if (NULL != server->listen_task)
755  {
757  server->listen_task = NULL;
758  }
759  if (NULL != server->listen_sockets)
760  {
761  i = 0;
762  while (NULL != server->listen_sockets[i])
765  GNUNET_free (server->listen_sockets);
766  server->listen_sockets = NULL;
767  }
768  if (GNUNET_NO == server->in_soft_shutdown)
769  server->in_soft_shutdown = GNUNET_YES;
770  test_monitor_clients (server);
771 }
772 
773 
779 void
781 {
782  struct HandlerList *hpos;
783  struct NotifyList *npos;
784  unsigned int i;
785 
787  "Server shutting down.\n");
788  if (NULL != server->listen_task)
789  {
791  server->listen_task = NULL;
792  }
793  if (NULL != server->listen_sockets)
794  {
795  i = 0;
796  while (NULL != server->listen_sockets[i])
799  GNUNET_free (server->listen_sockets);
800  server->listen_sockets = NULL;
801  }
802  while (NULL != server->clients_head)
804  while (NULL != (hpos = server->handlers))
805  {
806  server->handlers = hpos->next;
807  GNUNET_free (hpos);
808  }
809  while (NULL != (npos = server->disconnect_notify_list_head))
810  {
811  npos->callback (npos->callback_cls,
812  NULL);
815  npos);
816  GNUNET_free (npos);
817  }
818  while (NULL != (npos = server->connect_notify_list_head))
819  {
820  npos->callback (npos->callback_cls,
821  NULL);
823  server->connect_notify_list_tail,
824  npos);
825  GNUNET_free (npos);
826  }
827  GNUNET_free (server);
828 }
829 
830 
844 void
847 {
848  struct HandlerList *p;
849 
850  p = GNUNET_new (struct HandlerList);
851  p->handlers = handlers;
852  p->next = server->handlers;
853  server->handlers = p;
854 }
855 
856 
867 void
872  void *cls)
873 {
874  server->mst_create = create;
875  server->mst_destroy = destroy;
876  server->mst_receive = receive;
877  server->mst_cls = cls;
878 }
879 
880 
886 static void
888 {
889  struct GNUNET_SERVER_Client *client = cls;
890 
891  GNUNET_break (0 != client->warn_type); /* type should never be 0 here, as we don't use 0 */
892  client->warn_task =
894  &warn_no_receive_done, client);
896  _ (
897  "Processing code for message of type %u did not call `GNUNET_SERVER_receive_done' after %s\n"),
898  (unsigned int) client->warn_type,
901  GNUNET_YES));
902 }
903 
904 
912 void
914 {
915  if (NULL != client->warn_task)
916  {
918  client->warn_task = NULL;
919  }
920 }
921 
922 
938 int
940  struct GNUNET_SERVER_Client *sender,
941  const struct GNUNET_MessageHeader *message)
942 {
943  struct HandlerList *pos;
944  const struct GNUNET_SERVER_MessageHandler *mh;
945  unsigned int i;
946  uint16_t type;
947  uint16_t size;
948  int found;
949 
950  type = ntohs (message->type);
951  size = ntohs (message->size);
953  "Received message of type %u and size %u from client\n",
954  type, size);
955  found = GNUNET_NO;
956  for (pos = server->handlers; NULL != pos; pos = pos->next)
957  {
958  i = 0;
959  while (pos->handlers[i].callback != NULL)
960  {
961  mh = &pos->handlers[i];
962  if ((mh->type == type) || (mh->type == GNUNET_MESSAGE_TYPE_ALL))
963  {
964  if ((0 != mh->expected_size) && (mh->expected_size != size))
965  {
966 #if GNUNET8_NETWORK_IS_DEAD
968  "Expected %u bytes for message of type %u, got %u\n",
969  mh->expected_size, mh->type, size);
970  GNUNET_break_op (0);
971 #else
973  "Expected %u bytes for message of type %u, got %u\n",
974  mh->expected_size, mh->type, size);
975 #endif
976  return GNUNET_SYSERR;
977  }
978  if (NULL != sender)
979  {
980  if ((0 == sender->suspended) &&
981  (NULL == sender->warn_task))
982  {
983  GNUNET_break (0 != type); /* type should never be 0 here, as we don't use 0 */
985  sender->warn_task =
988  sender);
989  sender->warn_type = type;
990  }
991  sender->suspended++;
992  }
993  mh->callback (mh->callback_cls, sender, message);
994  found = GNUNET_YES;
995  }
996  i++;
997  }
998  }
999  if (GNUNET_NO == found)
1000  {
1002  "Received message of unknown type %d\n", type);
1003  if (GNUNET_YES == server->require_found)
1004  return GNUNET_SYSERR;
1005  }
1006  return GNUNET_OK;
1007 }
1008 
1009 
1020 static void
1021 process_incoming (void *cls,
1022  const void *buf,
1023  size_t available,
1024  const struct sockaddr *addr,
1025  socklen_t addrlen,
1026  int errCode);
1027 
1028 
1042 static void
1044  int ret)
1045 {
1046  while ((GNUNET_SYSERR != ret) && (NULL != client->server) &&
1047  (GNUNET_YES != client->shutdown_now) && (0 == client->suspended))
1048  {
1049  if (GNUNET_OK == ret)
1050  {
1052  "Server re-enters receive loop, timeout: %s.\n",
1054  GNUNET_YES));
1055  client->receive_pending = GNUNET_YES;
1056  if (GNUNET_OK !=
1059  client->idle_timeout,
1061  client))
1062  return;
1063  break;
1064  }
1066  "Server processes additional messages instantly.\n");
1067  if (NULL != client->server->mst_receive)
1068  ret =
1069  client->server->mst_receive (client->server->mst_cls, client->mst,
1070  client, NULL, 0, GNUNET_NO, GNUNET_YES);
1071  else
1072  ret =
1073  GNUNET_SERVER_mst_receive (client->mst, client, NULL, 0, GNUNET_NO,
1074  GNUNET_YES);
1075  }
1077  "Server leaves instant processing loop: ret = %d, server = %p, shutdown = %d, suspended = %u\n",
1078  ret, client->server,
1079  client->shutdown_now,
1080  client->suspended);
1081  if (GNUNET_NO == ret)
1082  {
1084  "Server has more data pending but is suspended.\n");
1085  client->receive_pending = GNUNET_SYSERR; /* data pending */
1086  }
1087  if ((GNUNET_SYSERR == ret) ||
1088  (GNUNET_YES == client->shutdown_now))
1090 }
1091 
1092 
1103 static void
1104 process_incoming (void *cls,
1105  const void *buf,
1106  size_t available,
1107  const struct sockaddr *addr,
1108  socklen_t addrlen,
1109  int errCode)
1110 {
1111  struct GNUNET_SERVER_Client *client = cls;
1112  struct GNUNET_SERVER_Handle *server = client->server;
1113  struct GNUNET_TIME_Absolute end;
1114  struct GNUNET_TIME_Absolute now;
1115  int ret;
1116 
1118  client->receive_pending = GNUNET_NO;
1119  now = GNUNET_TIME_absolute_get ();
1121  client->idle_timeout);
1122 
1123  if ((NULL == buf) &&
1124  (0 == available) &&
1125  (NULL == addr) &&
1126  (0 == errCode) &&
1127  (GNUNET_YES != client->shutdown_now) &&
1128  (NULL != server) &&
1130  (end.abs_value_us > now.abs_value_us))
1131  {
1132  /* wait longer, timeout changed (i.e. due to us sending) */
1134  "Receive time out, but no disconnect due to sending (%p)\n",
1135  client);
1136  client->receive_pending = GNUNET_YES;
1141  client);
1142  return;
1143  }
1144  if ((NULL == buf) ||
1145  (0 == available) ||
1146  (0 != errCode) ||
1147  (NULL == server) ||
1148  (GNUNET_YES == client->shutdown_now) ||
1150  {
1151  /* other side closed connection, error connecting, etc. */
1153  "Failed to connect or other side closed connection (%p)\n",
1154  client);
1156  return;
1157  }
1159  "Server receives %u bytes from `%s'.\n",
1160  (unsigned int) available,
1161  GNUNET_a2s (addr, addrlen));
1162  GNUNET_SERVER_client_keep (client);
1163  client->last_activity = now;
1164 
1165  if (NULL != server->mst_receive)
1166  {
1167  ret = client->server->mst_receive (client->server->mst_cls,
1168  client->mst,
1169  client,
1170  buf,
1171  available,
1172  GNUNET_NO,
1173  GNUNET_YES);
1174  }
1175  else if (NULL != client->mst)
1176  {
1177  ret =
1178  GNUNET_SERVER_mst_receive (client->mst,
1179  client,
1180  buf,
1181  available,
1182  GNUNET_NO,
1183  GNUNET_YES);
1184  }
1185  else
1186  {
1187  GNUNET_break (0);
1188  return;
1189  }
1190  process_mst (client,
1191  ret);
1192  GNUNET_SERVER_client_drop (client);
1193 }
1194 
1195 
1202 static void
1204 {
1205  struct GNUNET_SERVER_Client *client = cls;
1206 
1207  GNUNET_assert (GNUNET_YES != client->shutdown_now);
1208  client->restart_task = NULL;
1209  if (GNUNET_NO == client->receive_pending)
1210  {
1211  LOG (GNUNET_ERROR_TYPE_DEBUG, "Server begins to read again from client.\n");
1212  client->receive_pending = GNUNET_YES;
1215  client->idle_timeout,
1217  client);
1218  return;
1219  }
1221  "Server continues processing messages still in the buffer.\n");
1222  GNUNET_SERVER_client_keep (client);
1223  client->receive_pending = GNUNET_NO;
1224  process_mst (client,
1225  GNUNET_NO);
1226  GNUNET_SERVER_client_drop (client);
1227 }
1228 
1229 
1240 static int
1242  void *client,
1243  const struct GNUNET_MessageHeader *message)
1244 {
1245  struct GNUNET_SERVER_Handle *server = cls;
1246  struct GNUNET_SERVER_Client *sender = client;
1247  int ret;
1248 
1250  "Tokenizer gives server message of type %u and size %u from client\n",
1251  ntohs (message->type), ntohs (message->size));
1253  ret = GNUNET_SERVER_inject (server, sender, message);
1255  if ((GNUNET_OK != ret) || (GNUNET_YES == sender->shutdown_now))
1256  {
1258  return GNUNET_SYSERR;
1259  }
1260  return GNUNET_OK;
1261 }
1262 
1263 
1275 struct GNUNET_SERVER_Client *
1278 {
1279  struct GNUNET_SERVER_Client *client;
1280  struct NotifyList *n;
1281 
1282  client = GNUNET_new (struct GNUNET_SERVER_Client);
1283  client->connection = connection;
1284  client->server = server;
1286  client->idle_timeout = server->idle_timeout;
1288  server->clients_tail,
1289  client);
1290  if (NULL != server->mst_create)
1291  client->mst =
1292  server->mst_create (server->mst_cls, client);
1293  else
1294  client->mst =
1296  server);
1297  GNUNET_assert (NULL != client->mst);
1298  for (n = server->connect_notify_list_head; NULL != n; n = n->next)
1299  n->callback (n->callback_cls, client);
1300  client->receive_pending = GNUNET_YES;
1301  if (GNUNET_SYSERR ==
1304  client->idle_timeout,
1306  client))
1307  return NULL;
1308  return client;
1309 }
1310 
1311 
1320 void
1323 {
1324  client->idle_timeout = timeout;
1325 }
1326 
1327 
1335 void
1337 {
1338  client->reference_count++;
1339 }
1340 
1341 
1350 void
1352 {
1353  GNUNET_assert (client->reference_count > 0);
1354  client->reference_count--;
1355  if ((GNUNET_YES == client->shutdown_now) && (0 == client->reference_count))
1357 }
1358 
1359 
1368 int
1370  void **addr, size_t *addrlen)
1371 {
1372  return GNUNET_CONNECTION_get_address (client->connection, addr, addrlen);
1373 }
1374 
1375 
1386 void
1389  void *callback_cls)
1390 {
1391  struct NotifyList *n;
1392 
1393  n = GNUNET_new (struct NotifyList);
1394  n->callback = callback;
1398  n);
1399 }
1400 
1401 
1415 void
1418  void *callback_cls)
1419 {
1420  struct NotifyList *n;
1421  struct GNUNET_SERVER_Client *client;
1422 
1423  n = GNUNET_new (struct NotifyList);
1424  n->callback = callback;
1425  n->callback_cls = callback_cls;
1428  n);
1429  for (client = server->clients_head; NULL != client; client = client->next)
1430  callback (callback_cls, client);
1431 }
1432 
1433 
1441 void
1444  callback,
1445  void *callback_cls)
1446 {
1447  struct NotifyList *pos;
1448 
1449  for (pos = server->disconnect_notify_list_head; NULL != pos; pos = pos->next)
1450  if ((pos->callback == callback) && (pos->callback_cls == callback_cls))
1451  break;
1452  if (NULL == pos)
1453  {
1454  GNUNET_break (0);
1455  return;
1456  }
1459  pos);
1460  GNUNET_free (pos);
1461 }
1462 
1463 
1471 void
1474  void *callback_cls)
1475 {
1476  struct NotifyList *pos;
1477 
1478  for (pos = server->connect_notify_list_head; NULL != pos; pos = pos->next)
1479  if ((pos->callback == callback) && (pos->callback_cls == callback_cls))
1480  break;
1481  if (NULL == pos)
1482  {
1483  GNUNET_break (0);
1484  return;
1485  }
1487  server->connect_notify_list_tail,
1488  pos);
1489  GNUNET_free (pos);
1490 }
1491 
1492 
1501 void
1503 {
1504  struct GNUNET_SERVER_Handle *server = client->server;
1505  struct NotifyList *n;
1506 
1508  "Client is being disconnected from the server.\n");
1509  if (NULL != client->restart_task)
1510  {
1512  client->restart_task = NULL;
1513  }
1514  if (NULL != client->warn_task)
1515  {
1517  client->warn_task = NULL;
1518  }
1519  if (GNUNET_YES == client->receive_pending)
1520  {
1522  client->receive_pending = GNUNET_NO;
1523  }
1524  client->shutdown_now = GNUNET_YES;
1525  client->reference_count++; /* make sure nobody else clean up client... */
1526  if ((NULL != client->mst) &&
1527  (NULL != server))
1528  {
1530  server->clients_tail,
1531  client);
1532  if (NULL != server->mst_destroy)
1533  server->mst_destroy (server->mst_cls,
1534  client->mst);
1535  else
1536  GNUNET_SERVER_mst_destroy (client->mst);
1537  client->mst = NULL;
1538  for (n = server->disconnect_notify_list_head; NULL != n; n = n->next)
1539  n->callback (n->callback_cls,
1540  client);
1541  }
1542  client->reference_count--;
1543  if (client->reference_count > 0)
1544  {
1546  "RC of %p still positive, not destroying everything.\n",
1547  client);
1548  client->server = NULL;
1549  return;
1550  }
1551  if (GNUNET_YES == client->in_process_client_buffer)
1552  {
1554  "Still processing inputs of %p, not destroying everything.\n",
1555  client);
1556  return;
1557  }
1559  "RC of %p now zero, destroying everything.\n",
1560  client);
1561  if (GNUNET_YES == client->persist)
1563  if (NULL != client->th.cth)
1566  /* need to cancel again, as it might have been re-added
1567  in the meantime (i.e. during callbacks) */
1568  if (NULL != client->warn_task)
1569  {
1571  client->warn_task = NULL;
1572  }
1573  if (GNUNET_YES == client->receive_pending)
1574  {
1576  client->receive_pending = GNUNET_NO;
1577  }
1578  GNUNET_free (client);
1579  /* we might be in soft-shutdown, test if we're done */
1580  if (NULL != server)
1581  test_monitor_clients (server);
1582 }
1583 
1584 
1593 int
1595 {
1597 }
1598 
1599 
1609 static size_t
1610 transmit_ready_callback_wrapper (void *cls, size_t size, void *buf)
1611 {
1612  struct GNUNET_SERVER_Client *client = cls;
1614 
1615  client->th.cth = NULL;
1616  callback = client->th.callback;
1617  client->th.callback = NULL;
1619  return callback (client->th.callback_cls, size, buf);
1620 }
1621 
1622 
1640  size_t size,
1643  callback,
1644  void *callback_cls)
1645 {
1646  if (NULL != client->th.callback)
1647  return NULL;
1648  client->th.callback_cls = callback_cls;
1649  client->th.callback = callback;
1651  size,
1652  timeout,
1653  &
1655  client);
1656  return &client->th;
1657 }
1658 
1659 
1665 void
1668 {
1670  th->cth = NULL;
1671  th->callback = NULL;
1672 }
1673 
1674 
1681 void
1683 {
1684  client->persist = GNUNET_YES;
1685 }
1686 
1687 
1700 void
1702  int success)
1703 {
1704  if (NULL == client)
1705  return;
1706  GNUNET_assert (client->suspended > 0);
1707  client->suspended--;
1708  if (GNUNET_OK != success)
1709  {
1711  "GNUNET_SERVER_receive_done called with failure indication\n");
1712  if ((client->reference_count > 0) || (client->suspended > 0))
1713  client->shutdown_now = GNUNET_YES;
1714  else
1716  return;
1717  }
1718  if (client->suspended > 0)
1719  {
1721  "GNUNET_SERVER_receive_done called, but more clients pending\n");
1722  return;
1723  }
1724  if (NULL != client->warn_task)
1725  {
1727  client->warn_task = NULL;
1728  }
1729  if (GNUNET_YES == client->in_process_client_buffer)
1730  {
1732  "GNUNET_SERVER_receive_done called while still in processing loop\n");
1733  return;
1734  }
1735  if ((NULL == client->server) || (GNUNET_YES == client->shutdown_now))
1736  {
1738  return;
1739  }
1741  "GNUNET_SERVER_receive_done causes restart in reading from the socket\n");
1742  GNUNET_assert (NULL == client->restart_task);
1744  client);
1745 }
1746 
1747 
1748 /* end of server.c */
#define LOG(kind,...)
Definition: abd_api.c:38
static int ret
Return value of the commandline.
Definition: gnunet-abd.c:81
static struct GNUNET_TIME_Relative timeout
Desired timeout for the lookup (default is no timeout).
Definition: gnunet-abd.c:61
static int end
Set if we are to shutdown all services (including ARM).
Definition: gnunet-arm.c:34
static uint16_t port
Port number.
Definition: gnunet-bcd.c:83
static struct GNUNET_CADET_MessageHandler handlers[]
Handlers, for diverse services.
static struct GNUNET_CADET_Handle * mh
Cadet handle.
Definition: gnunet-cadet.c:92
static void destroy(void *cls)
static struct GNUNET_OS_Process * p
Helper process we started.
Definition: gnunet-qr.c:59
#define LOG_STRERROR(kind, syscall)
static char buf[2048]
#define GNUNET_log(kind,...)
@ GNUNET_SCHEDULER_PRIORITY_HIGH
Run with high priority (important requests).
@ GNUNET_OK
Definition: gnunet_common.h:95
@ GNUNET_YES
Definition: gnunet_common.h:97
@ GNUNET_NO
Definition: gnunet_common.h:94
@ GNUNET_SYSERR
Definition: gnunet_common.h:93
#define GNUNET_MAX_MESSAGE_SIZE
Largest supported message (to be precise, one byte more than the largest possible message,...
#define GNUNET_CONTAINER_DLL_remove(head, tail, element)
Remove an element from a DLL.
#define GNUNET_CONTAINER_DLL_insert(head, tail, element)
Insert an element at the head of a DLL.
#define GNUNET_break_op(cond)
Use this for assertion violations caused by other peers (i.e.
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
#define GNUNET_break(cond)
Use this for internal assertion violations that are not fatal (can be handled) but should not occur.
const char * GNUNET_a2s(const struct sockaddr *addr, socklen_t addrlen)
Convert a "struct sockaddr*" (IPv4 or IPv6 address) to a string (for printing debug messages).
@ GNUNET_ERROR_TYPE_WARNING
@ GNUNET_ERROR_TYPE_ERROR
@ GNUNET_ERROR_TYPE_BULK
@ GNUNET_ERROR_TYPE_DEBUG
@ GNUNET_ERROR_TYPE_INFO
#define GNUNET_new(type)
Allocate a struct or union of the given type.
#define GNUNET_malloc(size)
Wrapper around malloc.
#define GNUNET_free(ptr)
Wrapper around free.
struct GNUNET_NETWORK_FDSet * GNUNET_NETWORK_fdset_create(void)
Creates an fd set.
Definition: network.c:1245
void GNUNET_NETWORK_fdset_destroy(struct GNUNET_NETWORK_FDSet *fds)
Releases the associated memory of an fd set.
Definition: network.c:1261
struct GNUNET_NETWORK_Handle * GNUNET_NETWORK_socket_create(int domain, int type, int protocol)
Create a new socket.
Definition: network.c:907
void GNUNET_NETWORK_fdset_set(struct GNUNET_NETWORK_FDSet *fds, const struct GNUNET_NETWORK_Handle *desc)
Add a socket to the FD set.
Definition: network.c:1006
int GNUNET_NETWORK_socket_listen(const struct GNUNET_NETWORK_Handle *desc, int backlog)
Listen on a socket.
Definition: network.c:708
int GNUNET_NETWORK_socket_bind(struct GNUNET_NETWORK_Handle *desc, const struct sockaddr *address, socklen_t address_len)
Bind a socket to a particular address.
Definition: network.c:485
int GNUNET_NETWORK_fdset_isset(const struct GNUNET_NETWORK_FDSet *fds, const struct GNUNET_NETWORK_Handle *desc)
Check whether a socket is part of the fd set.
Definition: network.c:1024
int GNUNET_NETWORK_socket_close(struct GNUNET_NETWORK_Handle *desc)
Close a socket.
Definition: network.c:560
#define GNUNET_MESSAGE_TYPE_ALL
Type used to match 'all' message types.
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_read_net_with_priority(struct GNUNET_TIME_Relative delay, enum GNUNET_SCHEDULER_Priority priority, struct GNUNET_NETWORK_Handle *rfd, GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run with a specified priority and to be run after the specified delay or wh...
Definition: scheduler.c:1551
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_now(GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run as soon as possible.
Definition: scheduler.c:1296
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_select(enum GNUNET_SCHEDULER_Priority prio, struct GNUNET_TIME_Relative delay, const struct GNUNET_NETWORK_FDSet *rs, const struct GNUNET_NETWORK_FDSet *ws, GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run with a specified delay or when any of the specified file descriptor set...
Definition: scheduler.c:1841
const struct GNUNET_SCHEDULER_TaskContext * GNUNET_SCHEDULER_get_task_context(void)
Obtain the reasoning why the current task was started.
Definition: scheduler.c:752
void * GNUNET_SCHEDULER_cancel(struct GNUNET_SCHEDULER_Task *task)
Cancel the task with the specified identifier.
Definition: scheduler.c:972
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_delayed(struct GNUNET_TIME_Relative delay, GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run with a specified delay.
Definition: scheduler.c:1269
#define GNUNET_TIME_UNIT_FOREVER_REL
Constant used to specify "forever".
struct GNUNET_TIME_Relative GNUNET_TIME_absolute_get_duration(struct GNUNET_TIME_Absolute whence)
Get the duration of an operation as the difference of the current time and the given start time "henc...
Definition: time.c:263
struct GNUNET_TIME_Relative GNUNET_TIME_absolute_get_remaining(struct GNUNET_TIME_Absolute future)
Given a timestamp in the future, how much time remains until then?
Definition: time.c:232
struct GNUNET_TIME_Absolute GNUNET_TIME_absolute_get(void)
Get the current time.
Definition: time.c:86
#define GNUNET_TIME_UNIT_MINUTES
One minute.
struct GNUNET_TIME_Absolute GNUNET_TIME_absolute_add(struct GNUNET_TIME_Absolute start, struct GNUNET_TIME_Relative duration)
Add a given relative duration to the given start time.
Definition: time.c:277
const char * GNUNET_STRINGS_relative_time_to_string(struct GNUNET_TIME_Relative delta, int do_round)
Give relative time in human-readable fancy format.
Definition: strings.c:557
static unsigned int size
Size of the "table".
Definition: peer.c:67
#define _(String)
GNU gettext support macro.
Definition: platform.h:177
int GNUNET_SERVER_mst_receive(struct GNUNET_SERVER_MessageStreamTokenizer *mst, void *client_identity, const char *buf, size_t size, int purge, int one_shot)
Add incoming data to the receive buffer and call the callback for all complete messages.
struct GNUNET_SERVER_MessageStreamTokenizer * GNUNET_SERVER_mst_create(GNUNET_SERVER_MessageTokenizerCallback cb, void *cb_cls)
Create a message stream tokenizer.
void(* GNUNET_SERVER_MstDestroyCallback)(void *cls, void *mst)
Signature of a function to destroy a custom tokenizer.
void *(* GNUNET_SERVER_MstCreateCallback)(void *cls, struct GNUNET_SERVER_Client *client)
Signature of a function to create a custom tokenizer.
void(* GNUNET_SERVER_DisconnectCallback)(void *cls, struct GNUNET_SERVER_Client *client)
Functions with this signature are called whenever a client is disconnected on the network level.
void GNUNET_SERVER_mst_destroy(struct GNUNET_SERVER_MessageStreamTokenizer *mst)
Destroys a tokenizer.
size_t(* GNUNET_CONNECTION_TransmitReadyNotify)(void *cls, size_t size, void *buf)
Function called to notify a client about the connection begin ready to queue more data.
void(* GNUNET_SERVER_ConnectCallback)(void *cls, struct GNUNET_SERVER_Client *client)
Functions with this signature are called whenever a client is connected on the network level.
int(* GNUNET_SERVER_MstReceiveCallback)(void *cls, void *mst, struct GNUNET_SERVER_Client *client, const char *buf, size_t size, int purge, int one_shot)
Signature of a function to receive data for a custom tokenizer.
int(* GNUNET_CONNECTION_AccessCheck)(void *cls, const struct GNUNET_CONNECTION_Credentials *ucred, const struct sockaddr *addr, socklen_t addrlen)
Function to call for access control checks.
void GNUNET_CONNECTION_destroy(struct GNUNET_CONNECTION_Handle *connection)
Close the connection and free associated resources.
static struct GNUNET_SCHEDULER_TaskContext tc
Task context of the current task.
Definition: scheduler.c:423
handle for a network connection
struct GNUNET_NETWORK_Handle * sock
Underlying OS's socket, set to NULL after fatal errors.
Header for all communications.
uint16_t type
The type of the message (GNUNET_MESSAGE_TYPE_XXXX), in big-endian format.
uint16_t size
The length of the struct (in bytes, including the length field itself), in big-endian format.
collection of IO descriptors
handle to a socket
Definition: network.c:53
Context information passed to each scheduler task.
const struct GNUNET_NETWORK_FDSet * read_ready
Set of file descriptors ready for reading; note that additional bits may be set that were not in the ...
Entry in list of pending tasks.
Definition: scheduler.c:135
handle for a client of the server
struct GNUNET_SERVER_Client * prev
This is a doubly linked list.
uint16_t warn_type
Type of last message processed (for warn_no_receive_done).
struct GNUNET_TIME_Absolute warn_start
Time when the warn task was started.
int receive_pending
Are we currently trying to receive? (GNUNET_YES if we are, GNUNET_NO if we are not,...
unsigned int reference_count
Number of external entities with a reference to this client object.
unsigned int suspended
Was processing if incoming messages suspended while we were still processing data already received?...
int persist
Persist the file handle for this client no matter what happens, force the OS to close once the proces...
struct GNUNET_TIME_Relative idle_timeout
After how long should an idle connection time out (on write).
int shutdown_now
We're about to close down this client.
struct GNUNET_SCHEDULER_Task * warn_task
Task that warns about missing calls to GNUNET_SERVER_receive_done.
struct GNUNET_CONNECTION_Handle * connection
Client closure for callbacks.
struct GNUNET_SERVER_Client * next
This is a doubly linked list.
struct GNUNET_SERVER_TransmitHandle th
Transmission handle we return for this client from GNUNET_SERVER_notify_transmit_ready.
void * mst
Processing of incoming data.
void * user_context
User context value, manipulated using 'GNUNET_SERVER_client_{get/set}_user_context' functions.
size_t user_context_size
Last size given when user context was initialized; used for sanity check.
int is_monitor
Is this client a 'monitor' client that should not be counted when deciding on destroying the server d...
struct GNUNET_TIME_Absolute last_activity
Last activity on this socket (used to time it out if reference_count == 0).
struct GNUNET_SCHEDULER_Task * restart_task
ID of task used to restart processing.
int in_process_client_buffer
Are we currently in the "process_client_buffer" function (and will hence restart the receive job on e...
struct GNUNET_SERVER_Handle * server
Server that this client belongs to.
handle for a server
struct NotifyList * disconnect_notify_list_tail
Tail of linked list of functions to call on disconnects by clients.
void * mst_cls
Closure for 'mst_'-callbacks.
int require_found
Do we ignore messages of types that we do not understand or do we require that a handler is found (an...
struct GNUNET_SERVER_Client * clients_tail
Head of list of our current clients.
struct GNUNET_SCHEDULER_Task * listen_task
Task scheduled to do the listening.
struct NotifyList * connect_notify_list_tail
Tail of linked list of functions to call on connects by clients.
struct GNUNET_SERVER_Client * clients_head
Head of list of our current clients.
GNUNET_SERVER_MstCreateCallback mst_create
Alternative function to create a MST instance.
int in_soft_shutdown
Set to GNUNET_YES once we are in 'soft' shutdown where we wait for all non-monitor clients to disconn...
struct GNUNET_NETWORK_Handle ** listen_sockets
NULL-terminated array of sockets used to listen for new connections.
void * access_cb_cls
Closure for access_cb.
GNUNET_CONNECTION_AccessCheck access_cb
Function to call for access control.
GNUNET_SERVER_MstReceiveCallback mst_receive
Alternative function to give data to a MST instance.
GNUNET_SERVER_MstDestroyCallback mst_destroy
Alternative function to destroy a MST instance.
struct NotifyList * connect_notify_list_head
Head of linked list of functions to call on connects by clients.
struct HandlerList * handlers
List of handlers for incoming messages.
struct GNUNET_TIME_Relative idle_timeout
After how long should an idle connection time out (on write).
struct NotifyList * disconnect_notify_list_head
Head of linked list of functions to call on disconnects by clients.
GNUNET_SERVER_MessageCallback callback
Function to call for messages of "type".
Handle server returns for aborting transmission to a client.
void * callback_cls
Closure for callback.
GNUNET_CONNECTION_TransmitReadyNotify callback
Function to call to get the message.
struct GNUNET_CONNECTION_TransmitHandle * cth
Active connection transmission handle.
Time for absolute times used by GNUnet, in microseconds.
uint64_t abs_value_us
The actual value.
Time for relative time used by GNUnet, in microseconds.
List of arrays of message handlers.
const struct GNUNET_SERVER_MessageHandler * handlers
NULL-terminated array of handlers.
struct HandlerList * next
This is a linked list.
List of arrays of message handlers.
void * callback_cls
Closure for callback.
GNUNET_SERVER_DisconnectCallback callback
Function to call.
struct NotifyList * prev
This is a doubly linked list.
struct NotifyList * next
This is a doubly linked list.
void * GNUNET_CONNECTION_receive_cancel(struct GNUNET_CONNECTION_Handle *connection)
Cancel receive job on the given connection.
struct GNUNET_CONNECTION_TransmitHandle * GNUNET_CONNECTION_notify_transmit_ready(struct GNUNET_CONNECTION_Handle *connection, size_t size, struct GNUNET_TIME_Relative timeout, GNUNET_CONNECTION_TransmitReadyNotify notify, void *notify_cls)
Ask the connection to call us once the specified number of bytes are free in the transmission buffer.
int GNUNET_CONNECTION_disable_corking(struct GNUNET_CONNECTION_Handle *connection)
Disable the "CORK" feature for communication with the given connection, forcing the OS to immediately...
int GNUNET_CONNECTION_get_address(struct GNUNET_CONNECTION_Handle *connection, void **addr, size_t *addrlen)
Obtain the network address of the other party.
int GNUNET_CONNECTION_check(struct GNUNET_CONNECTION_Handle *connection)
Check if connection is valid (no fatal errors have happened so far).
int GNUNET_CONNECTION_receive(struct GNUNET_CONNECTION_Handle *connection, size_t max, struct GNUNET_TIME_Relative timeout, GNUNET_CONNECTION_Receiver receiver, void *receiver_cls)
Receive data from the given connection.
struct GNUNET_CONNECTION_Handle * GNUNET_CONNECTION_create_from_accept(GNUNET_CONNECTION_AccessCheck access_cb, void *access_cb_cls, struct GNUNET_NETWORK_Handle *lsock)
Create a connection handle by accepting on a listen socket.
void GNUNET_CONNECTION_persist_(struct GNUNET_CONNECTION_Handle *connection)
Set the persist option on this connection handle.
void GNUNET_CONNECTION_notify_transmit_ready_cancel(struct GNUNET_CONNECTION_TransmitHandle *th)
Cancel the specified transmission-ready notification.
void GNUNET_SERVER_client_set_user_context_(struct GNUNET_SERVER_Client *client, void *ptr, size_t size)
Set user context to be associated with the given client.
static void test_monitor_clients(struct GNUNET_SERVER_Handle *server)
Check if only 'monitor' clients are left.
void GNUNET_SERVER_add_handlers(struct GNUNET_SERVER_Handle *server, const struct GNUNET_SERVER_MessageHandler *handlers)
Add additional handlers to an existing server.
void GNUNET_SERVER_disable_receive_done_warning(struct GNUNET_SERVER_Client *client)
Disable the warning the server issues if a message is not acknowledged in a timely fashion.
void GNUNET_SERVER_client_keep(struct GNUNET_SERVER_Client *client)
Notify the server that the given client handle should be kept (keeps the connection up if possible,...
void GNUNET_SERVER_connect_notify(struct GNUNET_SERVER_Handle *server, GNUNET_SERVER_ConnectCallback callback, void *callback_cls)
Ask the server to notify us whenever a client connects.
void GNUNET_SERVER_disconnect_notify_cancel(struct GNUNET_SERVER_Handle *server, GNUNET_SERVER_DisconnectCallback callback, void *callback_cls)
Ask the server to stop notifying us whenever a client connects.
void GNUNET_SERVER_client_drop(struct GNUNET_SERVER_Client *client)
Notify the server that the given client handle is no longer required.
static void warn_no_receive_done(void *cls)
Task run to warn about missing calls to GNUNET_SERVER_receive_done.
static size_t transmit_ready_callback_wrapper(void *cls, size_t size, void *buf)
Wrapper for transmission notification that calls the original callback and update the last activity t...
void GNUNET_SERVER_client_set_timeout(struct GNUNET_SERVER_Client *client, struct GNUNET_TIME_Relative timeout)
Change the timeout for a particular client.
void GNUNET_SERVER_client_mark_monitor(struct GNUNET_SERVER_Client *client)
Set the 'monitor' flag on this client.
static void process_incoming(void *cls, const void *buf, size_t available, const struct sockaddr *addr, socklen_t addrlen, int errCode)
We are receiving an incoming message.
struct GNUNET_SERVER_Handle * GNUNET_SERVER_create_with_sockets(GNUNET_CONNECTION_AccessCheck access_cb, void *access_cb_cls, struct GNUNET_NETWORK_Handle **lsocks, struct GNUNET_TIME_Relative idle_timeout, int require_found)
Create a new server.
void GNUNET_SERVER_destroy(struct GNUNET_SERVER_Handle *server)
Free resources held by this server.
void * GNUNET_SERVER_client_get_user_context_(struct GNUNET_SERVER_Client *client, size_t size)
Return user context associated with the given client.
struct GNUNET_SERVER_Client * GNUNET_SERVER_connect_socket(struct GNUNET_SERVER_Handle *server, struct GNUNET_CONNECTION_Handle *connection)
Add a TCP socket-based connection to the set of handles managed by this server.
void GNUNET_SERVER_receive_done(struct GNUNET_SERVER_Client *client, int success)
Resume receiving from this client, we are done processing the current request.
void GNUNET_SERVER_client_persist_(struct GNUNET_SERVER_Client *client)
Set the persistent flag on this client, used to setup client connection to only be killed when the se...
int GNUNET_SERVER_inject(struct GNUNET_SERVER_Handle *server, struct GNUNET_SERVER_Client *sender, const struct GNUNET_MessageHeader *message)
Inject a message into the server, pretend it came from the specified client.
struct GNUNET_SERVER_TransmitHandle * GNUNET_SERVER_notify_transmit_ready(struct GNUNET_SERVER_Client *client, size_t size, struct GNUNET_TIME_Relative timeout, GNUNET_CONNECTION_TransmitReadyNotify callback, void *callback_cls)
Notify us when the server has enough space to transmit a message of the given size to the given clien...
static int client_message_tokenizer_callback(void *cls, void *client, const struct GNUNET_MessageHeader *message)
This function is called whenever our inbound message tokenizer has received a complete message.
int GNUNET_SERVER_client_get_address(struct GNUNET_SERVER_Client *client, void **addr, size_t *addrlen)
Obtain the network address of the other party.
void GNUNET_SERVER_connect_notify_cancel(struct GNUNET_SERVER_Handle *server, GNUNET_SERVER_ConnectCallback callback, void *callback_cls)
Ask the server to stop notifying us whenever a client disconnects.
void GNUNET_SERVER_suspend(struct GNUNET_SERVER_Handle *server)
Suspend accepting connections from the listen socket temporarily.
static void do_destroy(void *cls)
Helper function for test_monitor_clients() to trigger GNUNET_SERVER_destroy() after the stack has unw...
void GNUNET_SERVER_client_disconnect(struct GNUNET_SERVER_Client *client)
Ask the server to disconnect from the given client.
int GNUNET_SERVER_client_disable_corking(struct GNUNET_SERVER_Client *client)
Disable the "CORK" feature for communication with the given client, forcing the OS to immediately flu...
static void process_mst(struct GNUNET_SERVER_Client *client, int ret)
Process messages from the client's message tokenizer until either the tokenizer is empty (and then sc...
static struct GNUNET_NETWORK_Handle * open_listen_socket(const struct sockaddr *server_addr, socklen_t socklen)
Create and initialize a listen socket for the server.
static void restart_processing(void *cls)
Task run to start again receiving from the network and process requests.
void GNUNET_SERVER_stop_listening(struct GNUNET_SERVER_Handle *server)
Stop the listen socket and get ready to shutdown the server once only 'monitor' clients are left.
void GNUNET_SERVER_set_callbacks(struct GNUNET_SERVER_Handle *server, GNUNET_SERVER_MstCreateCallback create, GNUNET_SERVER_MstDestroyCallback destroy, GNUNET_SERVER_MstReceiveCallback receive, void *cls)
Change functions used by the server to tokenize the message stream.
struct GNUNET_SERVER_Handle * GNUNET_SERVER_create(GNUNET_CONNECTION_AccessCheck access_cb, void *access_cb_cls, struct sockaddr *const *server_addr, const socklen_t *socklen, struct GNUNET_TIME_Relative idle_timeout, int require_found)
Create a new server.
void GNUNET_SERVER_resume(struct GNUNET_SERVER_Handle *server)
Resume accepting connections from the listen socket.
void GNUNET_SERVER_notify_transmit_ready_cancel(struct GNUNET_SERVER_TransmitHandle *th)
Abort transmission request.
static void process_listen_socket(void *cls)
Scheduler says our listen socket is ready.
void GNUNET_SERVER_disconnect_notify(struct GNUNET_SERVER_Handle *server, GNUNET_SERVER_DisconnectCallback callback, void *callback_cls)
Ask the server to notify us whenever a client disconnects.
enum GNUNET_TESTBED_UnderlayLinkModelType type
the type of this model