2 This file is part of GNUnet.
3 (C) 2011 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.
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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 src/nat/gnunet-nat-server.c
23 * @brief Daemon to run on 'gnunet.org' to help test NAT traversal code
24 * @author Christian Grothoff
27 #include "gnunet_util_lib.h"
28 #include "gnunet_nat_lib.h"
29 #include "gnunet_protocols.h"
32 #define DEBUG_NAT GNUNET_NO
37 static struct GNUNET_SERVER_Handle *server;
42 static const struct GNUNET_CONFIGURATION_Handle *cfg;
46 * Try contacting the peer using autonomous
47 * NAT traveral method.
49 * @param dst_ipv4 IPv4 address to send the fake ICMP message
50 * @param dport destination port to include in ICMP message
51 * @param is_tcp mark for TCP (GNUNET_YES) or UDP (GNUNET_NO)
54 try_anat (uint32_t dst_ipv4,
58 struct GNUNET_NAT_Handle *h;
59 struct sockaddr_in sa;
62 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
63 "Asking for connection reversal with %x and code %u\n",
64 (unsigned int) dst_ipv4,
65 (unsigned int) dport);
67 h = GNUNET_NAT_register (cfg,
72 memset (&sa, 0, sizeof (sa));
73 sa.sin_family = AF_INET;
74 #if HAVE_SOCKADDR_IN_SIN_LEN
75 sa.sin_len = sizeof (sa);
77 sa.sin_addr.s_addr = dst_ipv4;
78 GNUNET_NAT_run_client (h, &sa);
79 GNUNET_NAT_unregister (h);
84 * Closure for 'tcp_send'.
91 struct GNUNET_NETWORK_Handle *s;
101 * Task called by the scheduler once we can do the TCP send
102 * (or once we failed to connect...).
104 * @param ctx the 'struct TcpContext'
105 * @param tc scheduler context
109 const struct GNUNET_SCHEDULER_TaskContext *tc)
111 struct TcpContext *ctx = cls;
113 if ( (NULL != tc->write_ready) &&
114 (GNUNET_NETWORK_fdset_isset (tc->write_ready,
117 if (-1 == GNUNET_NETWORK_socket_send (ctx->s, &ctx->data, sizeof (ctx->data)))
120 GNUNET_log_strerror (GNUNET_ERROR_TYPE_DEBUG, "send");
123 GNUNET_NETWORK_socket_shutdown (ctx->s, SHUT_RDWR);
125 GNUNET_NETWORK_socket_close (ctx->s);
131 * Try to send 'data' to the
132 * IP 'dst_ipv4' at port 'dport' via TCP.
134 * @param dst_ivp4 target IP
135 * @param dport target port
136 * @param data data to send
139 try_send_tcp (uint32_t dst_ipv4,
143 struct GNUNET_NETWORK_Handle *s;
144 struct sockaddr_in sa;
145 struct TcpContext *ctx;
147 s = GNUNET_NETWORK_socket_create (AF_INET, SOCK_STREAM, 0);
150 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "socket");
153 memset (&sa, 0, sizeof (sa));
154 sa.sin_family = AF_INET;
155 #if HAVE_SOCKADDR_IN_SIN_LEN
156 sa.sin_len = sizeof (sa);
158 sa.sin_addr.s_addr = dst_ipv4;
159 sa.sin_port = htons (dport);
161 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
162 "Sending TCP message to `%s'\n",
163 GNUNET_a2s ((struct sockaddr*) &sa, sizeof (sa)));
166 GNUNET_NETWORK_socket_connect (s,
167 (const struct sockaddr*) &sa, sizeof (sa))) &&
168 (errno != EINPROGRESS) )
170 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "connect");
171 GNUNET_NETWORK_socket_close (s);
174 ctx = GNUNET_malloc (sizeof (struct TcpContext));
177 GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_SECONDS,
184 * Try to send 'data' to the
185 * IP 'dst_ipv4' at port 'dport' via UDP.
187 * @param dst_ivp4 target IP
188 * @param dport target port
189 * @param data data to send
192 try_send_udp (uint32_t dst_ipv4,
196 struct GNUNET_NETWORK_Handle *s;
197 struct sockaddr_in sa;
199 s = GNUNET_NETWORK_socket_create (AF_INET, SOCK_DGRAM, 0);
202 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "socket");
205 memset (&sa, 0, sizeof (sa));
206 sa.sin_family = AF_INET;
207 #if HAVE_SOCKADDR_IN_SIN_LEN
208 sa.sin_len = sizeof (sa);
210 sa.sin_addr.s_addr = dst_ipv4;
211 sa.sin_port = htons (dport);
213 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
214 "Sending UDP packet to `%s'\n",
215 GNUNET_a2s ((struct sockaddr*) &sa, sizeof (sa)));
217 if (-1 == GNUNET_NETWORK_socket_sendto (s,
219 (const struct sockaddr*) &sa, sizeof (sa)))
220 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "sendto");
221 GNUNET_NETWORK_socket_close (s);
226 * We've received a request to probe a NAT
230 * @param client handle to client (we always close)
231 * @param msg message with details about what to test
235 struct GNUNET_SERVER_Client *client,
236 const struct GNUNET_MessageHeader *msg)
238 const struct GNUNET_NAT_TestMessage *tm;
242 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
243 "Received test request\n");
245 tm = (const struct GNUNET_NAT_TestMessage*) msg;
246 dport = ntohs (tm->dport);
248 try_anat (tm->dst_ipv4,
250 (int) ntohl (tm->is_tcp));
251 else if (GNUNET_YES == ntohl (tm->is_tcp))
252 try_send_tcp (tm->dst_ipv4, dport, tm->data);
254 try_send_udp (tm->dst_ipv4, dport, tm->data);
255 GNUNET_SERVER_receive_done (client,
261 * Task run during shutdown.
264 * @param tc scheduler context
267 shutdown_task (void *cls,
268 const struct GNUNET_SCHEDULER_TaskContext *tc)
270 GNUNET_SERVER_destroy (server);
276 * Main function that will be run.
279 * @param args remaining command-line arguments
280 * @param cfgfile name of the configuration file used (for saving, can be NULL!)
281 * @param c configuration
287 const struct GNUNET_CONFIGURATION_Handle *c)
289 static const struct GNUNET_SERVER_MessageHandler handlers[] =
291 { &test, NULL, GNUNET_MESSAGE_TYPE_NAT_TEST, sizeof (struct GNUNET_NAT_TestMessage) },
295 struct sockaddr_in in4;
296 struct sockaddr_in6 in6;
303 struct sockaddr *sa[] =
305 (struct sockaddr*) &in4,
306 (struct sockaddr*) &in6,
311 if ( (args[0] == NULL) ||
312 (1 != SSCANF (args[0], "%u", &port)) ||
317 _("Please pass valid port number as the first argument! (got `%s')\n"),
321 memset (&in4, 0, sizeof (in4));
322 memset (&in6, 0, sizeof (in6));
323 in4.sin_family = AF_INET;
324 in4.sin_port = htons ((uint16_t) port);
325 in6.sin6_family = AF_INET6;
326 in6.sin6_port = htons ((uint16_t) port);
327 #if HAVE_SOCKADDR_IN_SIN_LEN
328 in4.sin_len = sizeof (in4);
329 in6.sin6_len = sizeof (in6);
331 server = GNUNET_SERVER_create (NULL, NULL,
332 (struct sockaddr*const*) sa,
334 GNUNET_TIME_UNIT_SECONDS,
336 GNUNET_SERVER_add_handlers (server,
338 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL,
345 * Main function of gnunet-nat-server.
347 * @param argc number of command-line arguments
348 * @param argv command line
349 * @return 0 on success, -1 on error
352 main (int argc, char *const argv[])
354 static const struct GNUNET_GETOPT_CommandLineOption options[] = {
355 GNUNET_GETOPT_OPTION_END
359 GNUNET_PROGRAM_run (argc, argv,
360 "gnunet-nat-server [options] PORT",
361 _("GNUnet NAT traversal test helper daemon"),
369 /* end of gnunet-nat-server.c */