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"
30 #include "gnunet-service-dns-p.h"
31 #include "gnunet_protocols.h"
34 struct GNUNET_SCHEDULER_Handle *sched;
36 struct GNUNET_NETWORK_Handle *dnsout;
38 unsigned short dnsoutport;
41 static struct dns_cls mycls;
43 void hijack(unsigned short port) {
46 snprintf(port_s, 6, "%d", port);
47 GNUNET_OS_start_process(NULL, NULL, "gnunet-helper-hijack-dns", "gnunet-hijack-dns", port_s, NULL);
50 void unhijack(unsigned short port) {
53 snprintf(port_s, 6, "%d", port);
54 GNUNET_OS_start_process(NULL, NULL, "gnunet-helper-hijack-dns", "gnunet-hijack-dns", "-d", port_s, NULL);
57 void receive_query(void *cls, struct GNUNET_SERVER_Client *client, const struct GNUNET_MessageHeader *message)
59 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Received query!\n");
63 * Task run during shutdown.
69 cleanup_task (void *cls,
70 const struct GNUNET_SCHEDULER_TaskContext *tc)
72 unhijack(mycls.dnsoutport);
77 * @param sched scheduler to use
78 * @param server the initialized server
79 * @param cfg configuration to use
83 struct GNUNET_SCHEDULER_Handle *sched,
84 struct GNUNET_SERVER_Handle *server,
85 const struct GNUNET_CONFIGURATION_Handle *cfg)
87 static const struct GNUNET_SERVER_MessageHandler handlers[] = {
88 /* callback, cls, type, size */
89 {&receive_query, NULL, GNUNET_MESSAGE_TYPE_LOCAL_QUERY_DNS, 0},
95 mycls.dnsout = GNUNET_NETWORK_socket_create (AF_INET, SOCK_DGRAM, 0);
97 struct sockaddr_in * addr = alloca(sizeof(struct sockaddr_in));
98 memset(addr, 0, sizeof(struct sockaddr_in));
100 int err = GNUNET_NETWORK_socket_bind (mycls.dnsout, (struct sockaddr*)addr, sizeof(struct sockaddr_in));
101 err = getsockname(GNUNET_NETWORK_get_fd(mycls.dnsout), addr, (unsigned int[]){sizeof(struct sockaddr_in)});
103 mycls.dnsoutport = htons(addr->sin_port);
105 hijack(htons(addr->sin_port));
107 GNUNET_SERVER_add_handlers (server, handlers);
108 GNUNET_SCHEDULER_add_delayed (sched,
109 GNUNET_TIME_UNIT_FOREVER_REL,
115 * The main function for the dns service.
117 * @param argc number of arguments from the command line
118 * @param argv command line arguments
119 * @return 0 ok, 1 on error
122 main (int argc, char *const *argv)
125 GNUNET_SERVICE_run (argc,
127 "gnunet-service-dns",
128 GNUNET_SERVICE_OPTION_NONE,
129 &run, NULL)) ? 0 : 1;