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 3, or (at your
8 option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
22 * @file vpn/gnunet-service-dns.c
23 * @author Philipp Tölke
26 #include "gnunet_getopt_lib.h"
27 #include "gnunet_service_lib.h"
28 #include "gnunet_network_lib.h"
29 #include "gnunet_os_lib.h"
32 struct GNUNET_SCHEDULER_Handle *sched;
34 struct GNUNET_NETWORK_Handle *dnsout;
36 unsigned short dnsoutport;
39 void hijack(unsigned short port) {
42 snprintf(port_s, 6, "%d", port);
43 GNUNET_OS_start_process(NULL, NULL, "gnunet-helper-hijack-dns", "gnunet-hijack-dns", port_s, NULL);
46 void unhijack(unsigned short port) {
49 snprintf(port_s, 6, "%d", port);
50 GNUNET_OS_start_process(NULL, NULL, "gnunet-helper-hijack-dns", "gnunet-hijack-dns", "-d", port_s, NULL);
54 * Task run during shutdown.
60 cleanup_task (void *cls,
61 const struct GNUNET_SCHEDULER_TaskContext *tc)
63 unhijack(((struct dns_cls*)cls)->dnsoutport);
68 * @param sched scheduler to use
69 * @param server the initialized server
70 * @param cfg configuration to use
74 struct GNUNET_SCHEDULER_Handle *sched,
75 struct GNUNET_SERVER_Handle *server,
76 const struct GNUNET_CONFIGURATION_Handle *cfg)
78 static const struct GNUNET_SERVER_MessageHandler handlers[] = {
82 struct dns_cls* mycls = (struct dns_cls*)cls;
86 mycls->dnsout = GNUNET_NETWORK_socket_create (AF_INET, SOCK_DGRAM, 0);
88 struct sockaddr_in * addr = alloca(sizeof(struct sockaddr_in));
89 memset(addr, 0, sizeof(struct sockaddr_in));
91 int err = GNUNET_NETWORK_socket_bind (mycls->dnsout, (struct sockaddr*)addr, sizeof(struct sockaddr_in));
92 err = getsockname(GNUNET_NETWORK_get_fd(mycls->dnsout), addr, (unsigned int[]){sizeof(struct sockaddr_in)});
94 mycls->dnsoutport = htons(addr->sin_port);
96 hijack(htons(addr->sin_port));
98 GNUNET_SERVER_add_handlers (server, handlers);
99 GNUNET_SCHEDULER_add_delayed (sched,
100 GNUNET_TIME_UNIT_FOREVER_REL,
106 * The main function for the dns service.
108 * @param argc number of arguments from the command line
109 * @param argv command line arguments
110 * @return 0 ok, 1 on error
113 main (int argc, char *const *argv)
115 struct dns_cls* cls = GNUNET_malloc(sizeof(struct dns_cls));
118 GNUNET_SERVICE_run (argc,
120 "gnunet-service-dns",
121 GNUNET_SERVICE_OPTION_NONE,
124 GNUNET_free(cls); // Make clang happy