2 This file is part of GNUnet.
3 Copyright (C) 2016 GNUnet e.V.
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., 51 Franklin Street, Fifth Floor,
18 Boston, MA 02110-1301, USA.
22 * @file util/service_new.c
23 * @brief functions related to starting services (redesign)
24 * @author Christian Grothoff
27 #include "gnunet_util_lib.h"
28 #include "gnunet_protocols.h"
29 #include "gnunet_constants.h"
30 #include "gnunet_resolver_service.h"
34 * Information the service tracks per listen operation.
36 struct ServiceListenContext
42 struct ServiceListenContext *next;
47 struct ServiceListenContext *prev;
50 * Service this listen context belongs to.
52 struct GNUNET_SERVICE_Handle *sh;
55 * Socket we are listening on.
57 struct GNUNET_NETWORK_Handle *listen_socket;
60 * Task scheduled to do the listening.
62 struct GNUNET_SCHEDULER_Task *listen_task;
68 * Handle to a service.
70 struct GNUNET_SERVICE_Handle
75 const struct GNUNET_CONFIGURATION_Handle *cfg;
78 * Name of our service.
80 const char *service_name;
83 * Main service-specific task to run.
85 GNUNET_SERVICE_InitCallback service_init_cb;
88 * Function to call when clients connect.
90 GNUNET_SERVICE_ConnectHandler connect_cb;
93 * Function to call when clients disconnect / are disconnected.
95 GNUNET_SERVICE_DisconnectHandler disconnect_cb;
98 * Closure for @e service_init_cb, @e connect_cb, @e disconnect_cb.
103 * DLL of listen sockets used to accept new connections.
105 struct ServiceListenContext *slc_head;
108 * DLL of listen sockets used to accept new connections.
110 struct ServiceListenContext *slc_tail;
113 * Our clients, kept in a DLL.
115 struct GNUNET_SERVICE_Client *clients_head;
118 * Our clients, kept in a DLL.
120 struct GNUNET_SERVICE_Client *clients_tail;
123 * Message handlers to use for all clients.
125 const struct GNUNET_MQ_MessageHandler *handlers;
128 * Closure for @e task.
133 * IPv4 addresses that are not allowed to connect.
135 struct GNUNET_STRINGS_IPv4NetworkPolicy *v4_denied;
138 * IPv6 addresses that are not allowed to connect.
140 struct GNUNET_STRINGS_IPv6NetworkPolicy *v6_denied;
143 * IPv4 addresses that are allowed to connect (if not
144 * set, all are allowed).
146 struct GNUNET_STRINGS_IPv4NetworkPolicy *v4_allowed;
149 * IPv6 addresses that are allowed to connect (if not
150 * set, all are allowed).
152 struct GNUNET_STRINGS_IPv6NetworkPolicy *v6_allowed;
155 * Do we require a matching UID for UNIX domain socket connections?
156 * #GNUNET_NO means that the UID does not have to match (however,
157 * @e match_gid may still impose other access control checks).
162 * Do we require a matching GID for UNIX domain socket connections?
163 * Ignored if @e match_uid is #GNUNET_YES. Note that this is about
164 * checking that the client's UID is in our group OR that the
165 * client's GID is our GID. If both "match_gid" and @e match_uid are
166 * #GNUNET_NO, all users on the local system have access.
171 * Set to #GNUNET_YES if we got a shutdown signal and terminate
172 * the service if #have_non_monitor_clients() returns #GNUNET_YES.
179 enum GNUNET_SERVICE_Options options;
182 * If we are daemonizing, this FD is set to the
183 * pipe to the parent. Send '.' if we started
184 * ok, '!' if not. -1 if we are not daemonizing.
186 int ready_confirm_fd;
189 * Overall success/failure of the service start.
194 * Inherited listening sockets, only
195 * used during initialization.
196 * FIXME: remove from struct
198 struct GNUNET_NETWORK_Handle **lsocks;
203 * Handle to a client that is connected to a service.
205 struct GNUNET_SERVICE_Client
211 struct GNUNET_SERVICE_Client *next;
216 struct GNUNET_SERVICE_Client *prev;
219 * Server that this client belongs to.
221 struct GNUNET_SERVER_Handle *sh;
224 * Socket of this client.
226 struct GNUNET_NETWORK_Handle *sock;
229 * Message queue for the client.
231 struct GNUNET_MQ_Handle *mq;
234 * Tokenizer we use for processing incoming data.
236 struct GNUNET_SERVER_MessageStreamTokenizer *mst;
239 * Task that warns about missing calls to
240 * #GNUNET_SERVICE_client_continue().
242 struct GNUNET_SCHEDULER_Task *warn_task;
245 * Task that receives data from the client to
246 * pass it to the handlers.
248 struct GNUNET_SCHEDULER_Task *recv_task;
251 * Task that transmit data to the client.
253 struct GNUNET_SCHEDULER_Task *send_task;
256 * User context value, value returned from
257 * the connect callback.
262 * Persist the file handle for this client no matter what happens,
263 * force the OS to close once the process actually dies. Should only
264 * be used in special cases!
269 * Is this client a 'monitor' client that should not be counted
270 * when deciding on destroying the server during soft shutdown?
271 * (see also #GNUNET_SERVICE_start)
276 * Type of last message processed (for warn_no_receive_done).
283 * Check if any of the clients we have left are unrelated to
286 * @param sh service to check clients for
287 * @return #GNUNET_YES if we have non-monitoring clients left
290 have_non_monitor_clients (struct GNUNET_SERVICE_Handle *sh)
292 struct GNUNET_SERVICE_Client *client;
294 for (client = sh->clients_head;NULL != client; client = client->next)
296 if (client->is_monitor)
305 * Shutdown task triggered when a service should be terminated.
306 * This considers active clients and the service options to see
307 * how this specific service is to be terminated, and depending
308 * on this proceeds with the shutdown logic.
310 * @param cls our `struct GNUNET_SERVICE_Handle`
313 service_main (void *cls)
315 struct GNUNET_SERVICE_Handle *sh = cls;
316 struct GNUNET_SERVICE_Client *client;
321 case GNUNET_SERVICE_OPTION_NONE:
322 GNUNET_SERVICE_shutdown (sh);
324 case GNUNET_SERVICE_OPTION_MANUAL_SHUTDOWN:
325 /* This task should never be run if we are using
326 the manual shutdown. */
329 case GNUNET_SERVICE_OPTION_SOFT_SHUTDOWN:
330 sh->got_shutdown = GNUNET_YES;
331 GNUNET_SERVICE_suspend (sh);
332 if (GNUNET_NO == have_non_monitor_clients (sh))
333 GNUNET_SERVICE_shutdown (sh);
340 * First task run by any service. Initializes our shutdown task,
341 * starts the listening operation on our listen sockets and launches
342 * the custom logic of the application service.
344 * @param cls our `struct GNUNET_SERVICE_Handle`
347 service_main (void *cls)
349 struct GNUNET_SERVICE_Handle *sh = cls;
351 if (GNUNET_SERVICE_OPTION_MANUAL_SHUTDOWN != sh->options)
352 GNUNET_SCHEDULER_add_shutdown (&service_shutdown,
354 GNUNET_SERVICE_resume (sh);
355 sh->service_init_cb (sh->cb_cls,
362 * Parse an IPv4 access control list.
364 * @param ret location where to write the ACL (set)
365 * @param sh service context to use to get the configuration
366 * @param option name of the ACL option to parse
367 * @return #GNUNET_SYSERR on parse error, #GNUNET_OK on success (including
371 process_acl4 (struct GNUNET_STRINGS_IPv4NetworkPolicy **ret,
372 struct GNUNET_SERVICE_Context *sh,
377 if (!GNUNET_CONFIGURATION_have_value (sh->cfg, sh->service_name, option))
382 GNUNET_break (GNUNET_OK ==
383 GNUNET_CONFIGURATION_get_value_string (sh->cfg,
386 if (NULL == (*ret = GNUNET_STRINGS_parse_ipv4_policy (opt)))
388 LOG (GNUNET_ERROR_TYPE_WARNING,
389 _("Could not parse IPv4 network specification `%s' for `%s:%s'\n"),
390 opt, sh->service_name, option);
392 return GNUNET_SYSERR;
400 * Parse an IPv6 access control list.
402 * @param ret location where to write the ACL (set)
403 * @param sh service context to use to get the configuration
404 * @param option name of the ACL option to parse
405 * @return #GNUNET_SYSERR on parse error, #GNUNET_OK on success (including
409 process_acl6 (struct GNUNET_STRINGS_IPv6NetworkPolicy **ret,
410 struct GNUNET_SERVICE_Context *sh,
415 if (!GNUNET_CONFIGURATION_have_value (sh->cfg, sh->service_name, option))
420 GNUNET_break (GNUNET_OK ==
421 GNUNET_CONFIGURATION_get_value_string (sh->cfg,
424 if (NULL == (*ret = GNUNET_STRINGS_parse_ipv6_policy (opt)))
426 LOG (GNUNET_ERROR_TYPE_WARNING,
427 _("Could not parse IPv6 network specification `%s' for `%s:%s'\n"),
428 opt, sh->service_name, option);
430 return GNUNET_SYSERR;
438 * Get the list of addresses that a server for the given service
441 * @param service_name name of the service
442 * @param cfg configuration (which specifies the addresses)
443 * @param addrs set (call by reference) to an array of pointers to the
444 * addresses the server should bind to and listen on; the
445 * array will be NULL-terminated (on success)
446 * @param addr_lens set (call by reference) to an array of the lengths
447 * of the respective `struct sockaddr` struct in the @a addrs
449 * @return number of addresses found on success,
450 * #GNUNET_SYSERR if the configuration
451 * did not specify reasonable finding information or
452 * if it specified a hostname that could not be resolved;
453 * #GNUNET_NO if the number of addresses configured is
454 * zero (in this case, `*addrs` and `*addr_lens` will be
458 GNUNET_SERVICE_get_server_addresses (const char *service_name,
459 const struct GNUNET_CONFIGURATION_Handle *cfg,
460 struct sockaddr ***addrs,
461 socklen_t ** addr_lens)
464 struct GNUNET_NETWORK_Handle *desc;
465 unsigned long long port;
467 struct addrinfo hints;
468 struct addrinfo *res;
469 struct addrinfo *pos;
470 struct addrinfo *next;
475 struct sockaddr **saddrs;
476 socklen_t *saddrlens;
482 if (GNUNET_CONFIGURATION_have_value (cfg, service_name, "DISABLEV6"))
486 GNUNET_CONFIGURATION_get_value_yesno (cfg, service_name, "DISABLEV6")))
487 return GNUNET_SYSERR;
490 disablev6 = GNUNET_NO;
494 /* probe IPv6 support */
495 desc = GNUNET_NETWORK_socket_create (PF_INET6, SOCK_STREAM, 0);
498 if ((ENOBUFS == errno) || (ENOMEM == errno) || (ENFILE == errno) ||
501 LOG_STRERROR (GNUNET_ERROR_TYPE_ERROR, "socket");
502 return GNUNET_SYSERR;
504 LOG (GNUNET_ERROR_TYPE_INFO,
505 _("Disabling IPv6 support for service `%s', failed to create IPv6 socket: %s\n"),
506 service_name, STRERROR (errno));
507 disablev6 = GNUNET_YES;
511 GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (desc));
517 if (GNUNET_CONFIGURATION_have_value (cfg, service_name, "PORT"))
520 GNUNET_CONFIGURATION_get_value_number (cfg, service_name,
523 LOG (GNUNET_ERROR_TYPE_ERROR,
524 _("Require valid port number for service `%s' in configuration!\n"),
529 LOG (GNUNET_ERROR_TYPE_ERROR,
530 _("Require valid port number for service `%s' in configuration!\n"),
532 return GNUNET_SYSERR;
536 if (GNUNET_CONFIGURATION_have_value (cfg, service_name, "BINDTO"))
538 GNUNET_break (GNUNET_OK ==
539 GNUNET_CONFIGURATION_get_value_string (cfg, service_name,
540 "BINDTO", &hostname));
546 abstract = GNUNET_NO;
549 GNUNET_CONFIGURATION_have_value (cfg, service_name, "UNIXPATH")) &&
551 GNUNET_CONFIGURATION_get_value_filename (cfg, service_name, "UNIXPATH",
553 (0 < strlen (unixpath)))
555 /* probe UNIX support */
556 struct sockaddr_un s_un;
558 if (strlen (unixpath) >= sizeof (s_un.sun_path))
560 LOG (GNUNET_ERROR_TYPE_WARNING,
561 _("UNIXPATH `%s' too long, maximum length is %llu\n"), unixpath,
562 (unsigned long long) sizeof (s_un.sun_path));
563 unixpath = GNUNET_NETWORK_shorten_unixpath (unixpath);
564 LOG (GNUNET_ERROR_TYPE_INFO,
565 _("Using `%s' instead\n"),
569 abstract = GNUNET_CONFIGURATION_get_value_yesno (cfg,
571 "USE_ABSTRACT_SOCKETS");
572 if (GNUNET_SYSERR == abstract)
573 abstract = GNUNET_NO;
575 if ((GNUNET_YES != abstract)
577 GNUNET_DISK_directory_create_for_file (unixpath)))
578 GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR,
582 if (NULL != unixpath)
584 desc = GNUNET_NETWORK_socket_create (AF_UNIX, SOCK_STREAM, 0);
587 if ((ENOBUFS == errno) || (ENOMEM == errno) || (ENFILE == errno) ||
590 LOG_STRERROR (GNUNET_ERROR_TYPE_ERROR, "socket");
591 GNUNET_free_non_null (hostname);
592 GNUNET_free (unixpath);
593 return GNUNET_SYSERR;
595 LOG (GNUNET_ERROR_TYPE_INFO,
596 _("Disabling UNIX domain socket support for service `%s', failed to create UNIX domain socket: %s\n"),
599 GNUNET_free (unixpath);
604 GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (desc));
610 if ((0 == port) && (NULL == unixpath))
612 LOG (GNUNET_ERROR_TYPE_ERROR,
613 _("Have neither PORT nor UNIXPATH for service `%s', but one is required\n"),
615 GNUNET_free_non_null (hostname);
616 return GNUNET_SYSERR;
620 saddrs = GNUNET_malloc (2 * sizeof (struct sockaddr *));
621 saddrlens = GNUNET_malloc (2 * sizeof (socklen_t));
622 add_unixpath (saddrs, saddrlens, unixpath, abstract);
623 GNUNET_free_non_null (unixpath);
624 GNUNET_free_non_null (hostname);
626 *addr_lens = saddrlens;
630 if (NULL != hostname)
632 LOG (GNUNET_ERROR_TYPE_DEBUG,
633 "Resolving `%s' since that is where `%s' will bind to.\n",
636 memset (&hints, 0, sizeof (struct addrinfo));
638 hints.ai_family = AF_INET;
639 hints.ai_protocol = IPPROTO_TCP;
640 if ((0 != (ret = getaddrinfo (hostname, NULL, &hints, &res))) ||
643 LOG (GNUNET_ERROR_TYPE_ERROR,
644 _("Failed to resolve `%s': %s\n"),
647 GNUNET_free (hostname);
648 GNUNET_free_non_null (unixpath);
649 return GNUNET_SYSERR;
653 while (NULL != (pos = next))
656 if ((disablev6) && (pos->ai_family == AF_INET6))
662 LOG (GNUNET_ERROR_TYPE_ERROR,
663 _("Failed to find %saddress for `%s'.\n"),
664 disablev6 ? "IPv4 " : "",
667 GNUNET_free (hostname);
668 GNUNET_free_non_null (unixpath);
669 return GNUNET_SYSERR;
672 if (NULL != unixpath)
674 saddrs = GNUNET_malloc ((resi + 1) * sizeof (struct sockaddr *));
675 saddrlens = GNUNET_malloc ((resi + 1) * sizeof (socklen_t));
677 if (NULL != unixpath)
679 add_unixpath (saddrs, saddrlens, unixpath, abstract);
683 while (NULL != (pos = next))
686 if ((disablev6) && (AF_INET6 == pos->ai_family))
688 if ((IPPROTO_TCP != pos->ai_protocol) && (0 != pos->ai_protocol))
689 continue; /* not TCP */
690 if ((SOCK_STREAM != pos->ai_socktype) && (0 != pos->ai_socktype))
692 LOG (GNUNET_ERROR_TYPE_DEBUG, "Service `%s' will bind to `%s'\n",
693 service_name, GNUNET_a2s (pos->ai_addr, pos->ai_addrlen));
694 if (AF_INET == pos->ai_family)
696 GNUNET_assert (sizeof (struct sockaddr_in) == pos->ai_addrlen);
697 saddrlens[i] = pos->ai_addrlen;
698 saddrs[i] = GNUNET_malloc (saddrlens[i]);
699 GNUNET_memcpy (saddrs[i], pos->ai_addr, saddrlens[i]);
700 ((struct sockaddr_in *) saddrs[i])->sin_port = htons (port);
704 GNUNET_assert (AF_INET6 == pos->ai_family);
705 GNUNET_assert (sizeof (struct sockaddr_in6) == pos->ai_addrlen);
706 saddrlens[i] = pos->ai_addrlen;
707 saddrs[i] = GNUNET_malloc (saddrlens[i]);
708 GNUNET_memcpy (saddrs[i], pos->ai_addr, saddrlens[i]);
709 ((struct sockaddr_in6 *) saddrs[i])->sin6_port = htons (port);
713 GNUNET_free (hostname);
719 /* will bind against everything, just set port */
724 if (NULL != unixpath)
727 saddrs = GNUNET_malloc ((resi + 1) * sizeof (struct sockaddr *));
728 saddrlens = GNUNET_malloc ((resi + 1) * sizeof (socklen_t));
729 if (NULL != unixpath)
731 add_unixpath (saddrs, saddrlens, unixpath, abstract);
734 saddrlens[i] = sizeof (struct sockaddr_in);
735 saddrs[i] = GNUNET_malloc (saddrlens[i]);
736 #if HAVE_SOCKADDR_IN_SIN_LEN
737 ((struct sockaddr_in *) saddrs[i])->sin_len = saddrlens[i];
739 ((struct sockaddr_in *) saddrs[i])->sin_family = AF_INET;
740 ((struct sockaddr_in *) saddrs[i])->sin_port = htons (port);
746 if (NULL != unixpath)
748 saddrs = GNUNET_malloc ((resi + 1) * sizeof (struct sockaddr *));
749 saddrlens = GNUNET_malloc ((resi + 1) * sizeof (socklen_t));
751 if (NULL != unixpath)
753 add_unixpath (saddrs, saddrlens, unixpath, abstract);
756 saddrlens[i] = sizeof (struct sockaddr_in6);
757 saddrs[i] = GNUNET_malloc (saddrlens[i]);
758 #if HAVE_SOCKADDR_IN_SIN_LEN
759 ((struct sockaddr_in6 *) saddrs[i])->sin6_len = saddrlens[0];
761 ((struct sockaddr_in6 *) saddrs[i])->sin6_family = AF_INET6;
762 ((struct sockaddr_in6 *) saddrs[i])->sin6_port = htons (port);
764 saddrlens[i] = sizeof (struct sockaddr_in);
765 saddrs[i] = GNUNET_malloc (saddrlens[i]);
766 #if HAVE_SOCKADDR_IN_SIN_LEN
767 ((struct sockaddr_in *) saddrs[i])->sin_len = saddrlens[1];
769 ((struct sockaddr_in *) saddrs[i])->sin_family = AF_INET;
770 ((struct sockaddr_in *) saddrs[i])->sin_port = htons (port);
773 GNUNET_free_non_null (unixpath);
775 *addr_lens = saddrlens;
782 * Read listen sockets from the parent process (ARM).
784 * @param sh service context to initialize
785 * @return #GNUNET_YES if ok, #GNUNET_NO if not ok (must bind yourself),
786 * and #GNUNET_SYSERR on error.
789 receive_sockets_from_parent (struct GNUNET_SERVICE_Context *sh)
797 env_buf = getenv ("GNUNET_OS_READ_LSOCKS");
798 if ((NULL == env_buf) || (strlen (env_buf) <= 0))
800 /* Using W32 API directly here, because this pipe will
801 * never be used outside of this function, and it's just too much of a bother
802 * to create a GNUnet API that boxes a HANDLE (the way it is done with socks)
804 lsocks_pipe = (HANDLE) strtoul (env_buf, NULL, 10);
805 if ( (0 == lsocks_pipe) || (INVALID_HANDLE_VALUE == lsocks_pipe))
814 ret = ReadFile (lsocks_pipe, &count, sizeof (count), &rd, NULL);
815 if ((0 == ret) || (sizeof (count) != rd) || (0 == count))
818 GNUNET_malloc (sizeof (struct GNUNET_NETWORK_Handle *) * (count + 1));
821 for (i = 0; i < count; i++)
823 WSAPROTOCOL_INFOA pi;
827 ret = ReadFile (lsocks_pipe, &size, sizeof (size), &rd, NULL);
828 if ( (0 == ret) || (sizeof (size) != rd) || (sizeof (pi) != size) )
830 ret = ReadFile (lsocks_pipe, &pi, sizeof (pi), &rd, NULL);
831 if ( (0 == ret) || (sizeof (pi) != rd))
833 s = WSASocketA (pi.iAddressFamily, pi.iSocketType, pi.iProtocol, &pi, 0, WSA_FLAG_OVERLAPPED);
834 sh->lsocks[i] = GNUNET_NETWORK_socket_box_native (s);
835 if (NULL == sh->lsocks[i])
837 else if (i == count - 1)
842 sh->lsocks[count] = NULL;
847 CloseHandle (lsocks_pipe);
851 LOG (GNUNET_ERROR_TYPE_ERROR,
852 _("Could not access a pre-bound socket, will try to bind myself\n"));
853 for (i = 0; (i < count) && (NULL != sh->lsocks[i]); i++)
854 GNUNET_break (0 == GNUNET_NETWORK_socket_close (sh->lsocks[i]));
855 GNUNET_free_non_null (sh->lsocks);
865 * Create and initialize a listen socket for the server.
867 * @param server_addr address to listen on
868 * @param socklen length of @a server_addr
869 * @return NULL on error, otherwise the listen socket
871 static struct GNUNET_NETWORK_Handle *
872 open_listen_socket (const struct sockaddr *server_addr,
875 struct GNUNET_NETWORK_Handle *sock;
879 switch (server_addr->sa_family)
882 port = ntohs (((const struct sockaddr_in *) server_addr)->sin_port);
885 port = ntohs (((const struct sockaddr_in6 *) server_addr)->sin6_port);
895 sock = GNUNET_NETWORK_socket_create (server_addr->sa_family, SOCK_STREAM, 0);
898 LOG_STRERROR (GNUNET_ERROR_TYPE_ERROR, "socket");
902 /* bind the socket */
903 if (GNUNET_OK != GNUNET_NETWORK_socket_bind (sock, server_addr, socklen))
906 if (EADDRINUSE != errno)
908 /* we don't log 'EADDRINUSE' here since an IPv4 bind may
909 * fail if we already took the port on IPv6; if both IPv4 and
910 * IPv6 binds fail, then our caller will log using the
911 * errno preserved in 'eno' */
912 LOG_STRERROR (GNUNET_ERROR_TYPE_ERROR,
915 LOG (GNUNET_ERROR_TYPE_ERROR,
916 _("`%s' failed for port %d (%s).\n"),
919 (AF_INET == server_addr->sa_family) ? "IPv4" : "IPv6");
925 LOG (GNUNET_ERROR_TYPE_WARNING,
926 _("`%s' failed for port %d (%s): address already in use\n"),
928 (AF_INET == server_addr->sa_family) ? "IPv4" : "IPv6");
929 else if (AF_UNIX == server_addr->sa_family)
931 LOG (GNUNET_ERROR_TYPE_WARNING,
932 _("`%s' failed for `%s': address already in use\n"),
934 GNUNET_a2s (server_addr, socklen));
937 GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (sock));
941 if (GNUNET_OK != GNUNET_NETWORK_socket_listen (sock, 5))
943 LOG_STRERROR (GNUNET_ERROR_TYPE_ERROR,
945 GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (sock));
950 LOG (GNUNET_ERROR_TYPE_DEBUG,
951 "Server starts to listen on port %u.\n",
960 * Setup service handle
962 * Configuration may specify:
963 * - PORT (where to bind to for TCP)
964 * - UNIXPATH (where to bind to for UNIX domain sockets)
965 * - DISABLEV6 (disable support for IPv6, otherwise we use dual-stack)
966 * - BINDTO (hostname or IP address to bind to, otherwise we take everything)
967 * - ACCEPT_FROM (only allow connections from specified IPv4 subnets)
968 * - ACCEPT_FROM6 (only allow connections from specified IPv6 subnets)
969 * - REJECT_FROM (disallow allow connections from specified IPv4 subnets)
970 * - REJECT_FROM6 (disallow allow connections from specified IPv6 subnets)
972 * @param sh service context to initialize
973 * @return #GNUNET_OK if configuration succeeded
976 setup_service (struct GNUNET_SERVICE_Handle *sh)
978 struct GNUNET_TIME_Relative idleout;
987 if (GNUNET_CONFIGURATION_have_value
988 (sh->cfg, sh->service_name, "TOLERANT"))
992 GNUNET_CONFIGURATION_get_value_yesno (sh->cfg, sh->service_name,
995 LOG (GNUNET_ERROR_TYPE_ERROR,
996 _("Specified value for `%s' of service `%s' is invalid\n"),
997 "TOLERANT", sh->service_name);
998 return GNUNET_SYSERR;
1002 tolerant = GNUNET_NO;
1006 if ((NULL != (nfds = getenv ("LISTEN_FDS"))) &&
1007 (1 == SSCANF (nfds, "%u", &cnt)) && (cnt > 0) && (cnt < FD_SETSIZE) &&
1008 (cnt + 4 < FD_SETSIZE))
1011 GNUNET_malloc (sizeof (struct GNUNET_NETWORK_Handle *) * (cnt + 1));
1014 flags = fcntl (3 + cnt, F_GETFD);
1015 if ((flags < 0) || (0 != (flags & FD_CLOEXEC)) ||
1017 (sh->lsocks[cnt] = GNUNET_NETWORK_socket_box_native (3 + cnt))))
1019 LOG (GNUNET_ERROR_TYPE_ERROR,
1021 ("Could not access pre-bound socket %u, will try to bind myself\n"),
1022 (unsigned int) 3 + cnt);
1024 while (sh->lsocks[cnt] != NULL)
1025 GNUNET_break (0 == GNUNET_NETWORK_socket_close (sh->lsocks[cnt++]));
1026 GNUNET_free (sh->lsocks);
1031 unsetenv ("LISTEN_FDS");
1034 if (getenv ("GNUNET_OS_READ_LSOCKS") != NULL)
1036 receive_sockets_from_parent (sh);
1037 putenv ("GNUNET_OS_READ_LSOCKS=");
1041 if (NULL != sh->lsocks)
1043 /* listen only on inherited sockets if we have any */
1044 struct GNUNET_NETWORK_Handle **ls = sh->lsocks;
1045 for (; NULL != *ls; ls++)
1047 struct ServiceListenContext *slc;
1049 slc = GNUNET_new (struct ServiceListenContext);
1050 slc->listen_socket = *ls;
1051 GNUNET_CONTAINER_DLL_insert (sh->slc_head, sh->slc_tail, slc);
1053 GNUNET_free_non_null (sh->lsocks);
1057 struct sockaddr **addrs;
1058 socklen_t *addrlens;
1061 num = GNUNET_SERVICE_get_server_addresses (sh->service_name, sh->cfg,
1062 &addrs, &addrlens)));
1063 if (GNUNET_SYSERR == num)
1064 return GNUNET_SYSERR;
1066 for (int i = 0; i < num; i++)
1068 struct ServiceListenContext *slc;
1070 slc = GNUNET_new (struct ServiceListenContext);
1071 slc->listen_socket = open_listen_socket (addrs[i], addrlens[i]);
1072 GNUNET_break (NULL != slc->listen_socket);
1073 GNUNET_CONTAINER_DLL_insert (sh->slc_head, sh->slc_tail, slc);
1077 if ((NULL == sh->lsocks) &&
1079 GNUNET_SERVICE_get_server_addresses (sh->service_name, sh->cfg,
1080 &sh->addrs, &sh->addrlens)))
1081 return GNUNET_SYSERR;
1082 sh->require_found = tolerant ? GNUNET_NO : GNUNET_YES;
1084 GNUNET_CONFIGURATION_get_value_yesno (sh->cfg, sh->service_name,
1087 GNUNET_CONFIGURATION_get_value_yesno (sh->cfg, sh->service_name,
1089 process_acl4 (&sh->v4_denied, sh, "REJECT_FROM");
1090 process_acl4 (&sh->v4_allowed, sh, "ACCEPT_FROM");
1091 process_acl6 (&sh->v6_denied, sh, "REJECT_FROM6");
1092 process_acl6 (&sh->v6_allowed, sh, "ACCEPT_FROM6");
1099 * Creates the "main" function for a GNUnet service. You
1100 * should almost always use the #GNUNET_SERVICE_MAIN macro
1101 * instead of calling this function directly (except
1102 * for ARM, which should call this function directly).
1104 * The function will launch the service with the name @a service_name
1105 * using the @a service_options to configure its shutdown
1106 * behavior. Once the service is ready, the @a init_cb will be called
1107 * for service-specific initialization. @a init_cb will be given the
1108 * service handler which can be used to control the service's
1109 * availability. When clients connect or disconnect, the respective
1110 * @a connect_cb or @a disconnect_cb functions will be called. For
1111 * messages received from the clients, the respective @a handlers will
1112 * be invoked; for the closure of the handlers we use the return value
1113 * from the @a connect_cb invocation of the respective client.
1115 * Each handler MUST call #GNUNET_SERVICE_client_continue() after each
1116 * message to receive further messages from this client. If
1117 * #GNUNET_SERVICE_client_continue() is not called within a short
1118 * time, a warning will be logged. If delays are expected, services
1119 * should call #GNUNET_SERVICE_client_disable_continue_warning() to
1120 * disable the warning.
1122 * Clients sending invalid messages (based on @a handlers) will be
1123 * dropped. Additionally, clients can be dropped at any time using
1124 * #GNUNET_SERVICE_client_drop().
1126 * @param argc number of command-line arguments in @a argv
1127 * @param argv array of command-line arguments
1128 * @param service_name name of the service to run
1129 * @param options options controlling shutdown of the service
1130 * @param service_init_cb function to call once the service is ready
1131 * @param connect_cb function to call whenever a client connects
1132 * @param disconnect_cb function to call whenever a client disconnects
1133 * @param cls closure argument for @a service_init_cb, @a connect_cb and @a disconnect_cb
1134 * @param handlers NULL-terminated array of message handlers for the service,
1135 * the closure will be set to the value returned by
1136 * the @a connect_cb for the respective connection
1137 * @return 0 on success, non-zero on error
1140 GNUNET_SERVICE_ruN_ (int argc,
1142 const char *service_name,
1143 enum GNUNET_SERVICE_Options options,
1144 GNUNET_SERVICE_InitCallback service_init_cb,
1145 GNUNET_SERVICE_ConnectHandler connect_cb,
1146 GNUNET_SERVICE_DisconnectHandler disconnect_cb,
1148 const struct GNUNET_MQ_MessageHandler *handlers)
1150 struct GNUNET_SERVICE_Handle sh;
1152 char *opt_cfg_filename;
1158 unsigned long long skew_offset;
1159 unsigned long long skew_variance;
1160 long long clock_offset;
1161 struct GNUNET_SERVICE_Context sh;
1162 struct GNUNET_CONFIGURATION_Handle *cfg;
1164 struct GNUNET_GETOPT_CommandLineOption service_options[] = {
1165 GNUNET_GETOPT_OPTION_CFG_FILE (&opt_cfg_filename),
1166 {'d', "daemonize", NULL,
1167 gettext_noop ("do daemonize (detach from terminal)"), 0,
1168 GNUNET_GETOPT_set_one, &do_daemonize},
1169 GNUNET_GETOPT_OPTION_HELP (NULL),
1170 GNUNET_GETOPT_OPTION_LOGLEVEL (&loglev),
1171 GNUNET_GETOPT_OPTION_LOGFILE (&logfile),
1172 GNUNET_GETOPT_OPTION_VERSION (PACKAGE_VERSION " " VCS_VERSION),
1173 GNUNET_GETOPT_OPTION_END
1176 xdg = getenv ("XDG_CONFIG_HOME");
1178 GNUNET_asprintf (&cfg_filename,
1182 GNUNET_OS_project_data_get ()->config_file);
1184 cfg_filename = GNUNET_strdup (GNUNET_OS_project_data_get ()->user_config_file);
1186 sh.options = options;
1187 sh.cfg = cfg = GNUNET_CONFIGURATION_create ();
1188 sh.service_init_cb = service_init_cb;
1189 sh.connect_cb = connect_cb;
1190 sh.disconnect_cb = disconnect_cb;
1192 sh.handlers = handlers;
1194 /* setup subsystems */
1195 ret = GNUNET_GETOPT_run (service_name, service_options, argc, argv);
1196 if (GNUNET_SYSERR == ret)
1198 if (GNUNET_NO == ret)
1203 if (GNUNET_OK != GNUNET_log_setup (service_name, loglev, logfile))
1205 if (NULL == opt_cfg_filename)
1206 opt_cfg_filename = GNUNET_strdup (cfg_filename);
1207 if (GNUNET_YES == GNUNET_DISK_file_test (opt_cfg_filename))
1209 if (GNUNET_SYSERR == GNUNET_CONFIGURATION_load (cfg, opt_cfg_filename))
1211 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1212 _("Malformed configuration file `%s', exit ...\n"),
1219 if (GNUNET_SYSERR == GNUNET_CONFIGURATION_load (cfg, NULL))
1221 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1222 _("Malformed configuration, exit ...\n"));
1225 if (0 != strcmp (opt_cfg_filename, cfg_filename))
1226 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1227 _("Could not access configuration file `%s'\n"),
1230 if (GNUNET_OK != setup_service (&sh))
1232 if ((1 == do_daemonize) && (GNUNET_OK != detach_terminal (&sh)))
1237 if (GNUNET_OK != set_user_id (&sh))
1239 LOG (GNUNET_ERROR_TYPE_DEBUG,
1240 "Service `%s' runs with configuration from `%s'\n",
1244 GNUNET_CONFIGURATION_get_value_number (sh.cfg, "TESTING",
1245 "SKEW_OFFSET", &skew_offset)) &&
1247 GNUNET_CONFIGURATION_get_value_number (sh.cfg, "TESTING",
1248 "SKEW_VARIANCE", &skew_variance)))
1250 clock_offset = skew_offset - skew_variance;
1251 GNUNET_TIME_set_offset (clock_offset);
1252 LOG (GNUNET_ERROR_TYPE_DEBUG, "Skewing clock by %dll ms\n", clock_offset);
1254 /* actually run service */
1256 GNUNET_SCHEDULER_run (&service_main, &sh);
1258 if ((1 == do_daemonize) && (NULL != sh.server))
1259 pid_file_delete (&sh);
1260 GNUNET_free_non_null (sh.my_handlers);
1263 if (-1 != sh.ready_confirm_fd)
1265 if (1 != WRITE (sh.ready_confirm_fd, err ? "I" : "S", 1))
1266 LOG_STRERROR (GNUNET_ERROR_TYPE_WARNING, "write");
1267 GNUNET_break (0 == CLOSE (sh.ready_confirm_fd));
1274 GNUNET_CONFIGURATION_have_value (sh.cfg, service_name,
1277 GNUNET_CONFIGURATION_get_value_string (sh.cfg, service_name,
1284 GAUGER (service_name, counter, mi.usmblks, "blocks");
1285 GNUNET_free (counter);
1289 GNUNET_SPEEDUP_stop_ ();
1290 GNUNET_CONFIGURATION_destroy (cfg);
1292 while (NULL != sh->slc_head)
1294 struct ServiceListenContext *slc = sh->slc_head;
1295 sh->slc_head = slc->next;
1296 // FIXME: destroy slc
1300 GNUNET_free_non_null (logfile);
1301 GNUNET_free_non_null (loglev);
1302 GNUNET_free (cfg_filename);
1303 GNUNET_free_non_null (opt_cfg_filename);
1304 GNUNET_free_non_null (sh.v4_denied);
1305 GNUNET_free_non_null (sh.v6_denied);
1306 GNUNET_free_non_null (sh.v4_allowed);
1307 GNUNET_free_non_null (sh.v6_allowed);
1309 return err ? GNUNET_SYSERR : sh.ret;
1314 * Suspend accepting connections from the listen socket temporarily.
1315 * Resume activity using #GNUNET_SERVICE_resume.
1317 * @param sh service to stop accepting connections.
1320 GNUNET_SERVICE_suspend (struct GNUNET_SERVICE_Handle *sh)
1322 struct ServiceListenContext *slc;
1324 for (slc = slc_head; NULL != slc; slc = slc->next)
1326 if (NULL != slc->listen_task)
1328 GNUNET_SCHEDULER_cancel (slc->listen_task);
1329 slc->listen_task = NULL;
1336 * Signature of functions implementing the sending functionality of a
1339 * @param mq the message queue
1340 * @param msg the message to send
1341 * @param impl_state state of the implementation
1344 service_mq_send (struct GNUNET_MQ_Handle *mq,
1345 const struct GNUNET_MessageHeader *msg,
1348 struct GNUNET_SERVICE_Client *client = cls;
1350 // FIXME 1: setup "client->send_task" for transmission.
1351 // FIXME 2: I seriously hope we do not need to make a copy of `msg`!
1352 // OPTIMIZATION: ideally, we'd like the ability to peak at the rest of
1353 // the queue and transmit more than one message if possible.
1358 * Implementation function that cancels the currently sent message.
1360 * @param mq message queue
1361 * @param impl_state state specific to the implementation
1364 service_mq_cancel (struct GNUNET_MQ_Handle *mq,
1367 struct GNUNET_SERVICE_Client *client = cls;
1369 // FIXME: stop transmission! (must be possible, otherwise
1370 // we must have told MQ that the message was sent!)
1375 * Generic error handler, called with the appropriate
1376 * error code and the same closure specified at the creation of
1377 * the message queue.
1378 * Not every message queue implementation supports an error handler.
1380 * @param cls closure
1381 * @param error error code
1384 service_mq_error_handler (void *cls,
1385 enum GNUNET_MQ_Error error)
1387 struct GNUNET_SERVICE_Client *client = cls;
1394 * Functions with this signature are called whenever a
1395 * complete message is received by the tokenizer for a client.
1397 * Do not call #GNUNET_SERVER_mst_destroy() from within
1398 * the scope of this callback.
1400 * @param cls closure with the `struct GNUNET_SERVICE_Client *`
1401 * @param client closure with the `struct GNUNET_SERVICE_Client *`
1402 * @param message the actual message
1403 * @return #GNUNET_OK on success (always)
1406 service_client_mst_cb (void *cls,
1408 const struct GNUNET_MessageHeader *message)
1410 struct GNUNET_SERVICE_Client *client = cls;
1412 GNUNET_MQ_inject_message (client->mq,
1419 * A client sent us data. Receive and process it. If we are done,
1420 * reschedule this task.
1422 * @param cls the `struct GNUNET_SERVICE_Client` that sent us data.
1425 service_client_recv (void *cls)
1427 struct GNUNET_SERVICE_Client *client = cls;
1429 // FIXME: read into buffer, pass to MST, then client->mq inject!
1430 // FIXME: revise MST API to avoid the memcpy!
1431 // i.e.: GNUNET_MST_read (client->sock);
1436 * We have successfully accepted a connection from a client. Now
1437 * setup the client (with the scheduler) and tell the application.
1439 * @param sh service that accepted the client
1440 * @param sock socket associated with the client
1443 start_client (struct GNUNET_SERVICE_Handle *sh,
1444 struct GNUNET_NETWORK_Handle *csock)
1446 struct GNUNET_SERVICE_Client *client;
1448 client = GNUNET_new (struct GNUNET_SERVICE_Client);
1449 GNUNET_CONTAINER_DLL_insert (sh->clients_head,
1453 client->sock = csock;
1454 client->mq = GNUNET_MQ_queue_for_callbacks (&service_mq_send,
1459 &service_mq_error_handler,
1461 client->mst = GNUNET_SERVER_mst_create (&service_client_mst_cb,
1463 client->user_context = sh->connect_cb (sh->cb_cls,
1466 GNUNET_MQ_set_handlers_closure (client->mq,
1467 client->user_context);
1468 client->recv_task = GNUNET_SCHEDULER_add_read (client->sock,
1469 &service_client_recv,
1475 * We have a client. Accept the incoming socket(s) (and reschedule
1478 * @param cls the `struct ServiceListenContext` of the ready listen socket
1481 accept_client (void *cls)
1483 struct ServiceListenContext *slc = cls;
1485 slc->listen_task = NULL;
1488 struct GNUNET_NETWORK_Handle *sock;
1489 struct sockaddr_in *v4;
1490 struct sockaddr_in6 *v6;
1491 struct sockaddr_storage sa;
1495 addrlen = sizeof (sa);
1496 sock = GNUNET_NETWORK_socket_accept (slc->listen_socket,
1497 (struct sockaddr *) &sa,
1501 switch (sa.sa_family)
1504 GNUNET_assert (addrlen == sizeof (struct sockaddr_in));
1505 v4 = (const struct sockaddr_in *) addr;
1506 ok = ( ( (NULL == sh->v4_allowed) ||
1507 (check_ipv4_listed (sh->v4_allowed,
1509 ( (NULL == sh->v4_denied) ||
1510 (! check_ipv4_listed (sh->v4_denied,
1511 &i4->sin_addr)) ) );
1514 GNUNET_assert (addrlen == sizeof (struct sockaddr_in6));
1515 v6 = (const struct sockaddr_in6 *) addr;
1516 ok = ( ( (NULL == sh->v6_allowed) ||
1517 (check_ipv6_listed (sh->v6_allowed,
1518 &i6->sin6_addr))) &&
1519 ( (NULL == sh->v6_denied) ||
1520 (! check_ipv6_listed (sh->v6_denied,
1521 &i6->sin6_addr)) ) );
1525 ok = GNUNET_OK; /* controlled using file-system ACL now */
1529 LOG (GNUNET_ERROR_TYPE_WARNING,
1530 _("Unknown address family %d\n"),
1532 return GNUNET_SYSERR;
1536 LOG (GNUNET_ERROR_TYPE_DEBUG,
1537 "Service rejected incoming connection from %s due to policy.\n",
1538 GNUNET_a2s ((const struct sockaddr *) &sa,
1540 GNUNET_NETWORK_socket_close (sock);
1543 LOG (GNUNET_ERROR_TYPE_DEBUG,
1544 "Service accepted incoming connection from %s.\n",
1545 GNUNET_a2s ((const struct sockaddr *) &sa,
1547 start_client (slc->sh,
1550 slc->listen_task = GNUNET_SCHEDULER_add_read (slc->listen_socket,
1557 * Resume accepting connections from the listen socket.
1559 * @param sh service to resume accepting connections.
1562 GNUNET_SERVICE_resume (struct GNUNET_SERVICE_Handle *sh)
1564 struct ServiceListenContext *slc;
1566 for (slc = slc_head; NULL != slc; slc = slc->next)
1568 GNUNET_assert (NULL == slc->listen_task);
1569 slc->listen_task = GNUNET_SCHEDULER_add_read (slc->listen_socket,
1577 * Continue receiving further messages from the given client.
1578 * Must be called after each message received.
1580 * @param c the client to continue receiving from
1583 GNUNET_SERVICE_client_continue (struct GNUNET_SERVICE_Client *c)
1585 GNUNET_break (0); // not implemented
1590 * Disable the warning the server issues if a message is not
1591 * acknowledged in a timely fashion. Use this call if a client is
1592 * intentionally delayed for a while. Only applies to the current
1595 * @param c client for which to disable the warning
1598 GNUNET_SERVICE_client_disable_continue_warning (struct GNUNET_SERVICE_Client *c)
1600 GNUNET_break (NULL != c->warn_task);
1601 if (NULL != c->warn_task)
1603 GNUNET_SCHEDULER_cancel (c->warn_task);
1604 c->warn_task = NULL;
1610 * Ask the server to disconnect from the given client. This is the
1611 * same as returning #GNUNET_SYSERR within the check procedure when
1612 * handling a message, wexcept that it allows dropping of a client even
1613 * when not handling a message from that client. The `disconnect_cb`
1614 * will be called on @a c even if the application closes the connection
1615 * using this function.
1617 * @param c client to disconnect now
1620 GNUNET_SERVICE_client_drop (struct GNUNET_SERVICE_Client *c)
1622 struct GNUNET_SERVICE_Handle *sh = c->sh;
1624 GNUNET_CONTAINER_DLL_remove (sh->clients_head,
1627 sh->disconnect_cb (sh->cb_cls,
1630 if (NULL != c->warn_task)
1632 GNUNET_SCHEDULER_cancel (c->warn_task);
1633 c->warn_task = NULL;
1635 if (NULL != c->recv_task)
1637 GNUNET_SCHEDULER_cancel (c->recv_task);
1638 c->recv_task = NULL;
1640 if (NULL != c->send_task)
1642 GNUNET_SCHEDULER_cancel (c->send_task);
1643 c->send_task = NULL;
1645 GNUNET_SERVER_mst_destroy (c->mst);
1646 GNUNET_MQ_destroy (c->mq);
1647 if (GNUNET_NO == c->persist)
1649 GNUNET_NETWORK_socket_close (c->sock);
1653 GNUNET_NETWORK_socket_free_memory_only_ (c->sock);
1656 if ( (GNUNET_YES == sh->got_shutdown) &&
1657 (GNUNET_NO == have_non_monitor_clients (sh)) )
1658 GNUNET_SERVICE_shutdown (sh);
1663 * Explicitly stops the service.
1665 * @param sh server to shutdown
1668 GNUNET_SERVICE_shutdown (struct GNUNET_SERVICE_Handle *sh)
1670 struct GNUNET_SERVICE_Client *client;
1672 GNUNET_SERVICE_suspend (sh);
1673 sh->got_shutdown = GNUNET_NO;
1674 while (NULL != (client = sh->clients_head))
1675 GNUNET_SERVICE_client_drop (client);
1680 * Set the 'monitor' flag on this client. Clients which have been
1681 * marked as 'monitors' won't prevent the server from shutting down
1682 * once #GNUNET_SERVICE_stop_listening() has been invoked. The idea is
1683 * that for "normal" clients we likely want to allow them to process
1684 * their requests; however, monitor-clients are likely to 'never'
1685 * disconnect during shutdown and thus will not be considered when
1686 * determining if the server should continue to exist after
1687 * shutdown has been triggered.
1689 * @param c client to mark as a monitor
1692 GNUNET_SERVICE_client_mark_monitor (struct GNUNET_SERVICE_Client *c)
1694 c->is_monitor = GNUNET_YES;
1695 if ( (GNUNET_YES == sh->got_shutdown) &&
1696 (GNUNET_NO == have_non_monitor_clients (sh)) )
1697 GNUNET_SERVICE_shutdown (sh);
1702 * Set the persist option on this client. Indicates that the
1703 * underlying socket or fd should never really be closed. Used for
1704 * indicating process death.
1706 * @param c client to persist the socket (never to be closed)
1709 GNUNET_SERVICE_client_persist (struct GNUNET_SERVICE_Client *c)
1711 c->persist = GNUNET_YES;
1715 /* end of service_new.c */