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3 Copyright (C) 2011 GNUnet e.V.
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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
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
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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"
36 static struct GNUNET_SERVER_Handle *server;
41 static const struct GNUNET_CONFIGURATION_Handle *cfg;
45 * Try contacting the peer using autonomous NAT traveral method.
47 * @param dst_ipv4 IPv4 address to send the fake ICMP message
48 * @param dport destination port to include in ICMP message
49 * @param is_tcp mark for TCP (#GNUNET_YES) or UDP (#GNUNET_NO)
52 try_anat (uint32_t dst_ipv4,
56 struct GNUNET_NAT_Handle *h;
57 struct sockaddr_in sa;
59 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
60 "Asking for connection reversal with %x and code %u\n",
61 (unsigned int) dst_ipv4,
62 (unsigned int) dport);
63 h = GNUNET_NAT_register (cfg,
67 NULL, NULL, NULL, NULL, NULL, NULL);
68 memset (&sa, 0, sizeof (sa));
69 sa.sin_family = AF_INET;
70 #if HAVE_SOCKADDR_IN_SIN_LEN
71 sa.sin_len = sizeof (sa);
73 sa.sin_addr.s_addr = dst_ipv4;
74 GNUNET_NAT_run_client (h, &sa);
75 GNUNET_NAT_unregister (h);
80 * Closure for #tcp_send.
87 struct GNUNET_NETWORK_Handle *s;
97 * Task called by the scheduler once we can do the TCP send
98 * (or once we failed to connect...).
100 * @param cls the `struct TcpContext`
105 struct TcpContext *ctx = cls;
106 const struct GNUNET_SCHEDULER_TaskContext *tc;
108 tc = GNUNET_SCHEDULER_get_task_context ();
109 if ((NULL != tc->write_ready) &&
110 (GNUNET_NETWORK_fdset_isset (tc->write_ready, ctx->s)))
113 GNUNET_NETWORK_socket_send (ctx->s, &ctx->data, sizeof (ctx->data)))
115 GNUNET_log_strerror (GNUNET_ERROR_TYPE_DEBUG, "send");
117 GNUNET_NETWORK_socket_shutdown (ctx->s, SHUT_RDWR);
119 GNUNET_NETWORK_socket_close (ctx->s);
125 * Try to send @a data to the
126 * IP @a dst_ipv4' at port @a dport via TCP.
128 * @param dst_ipv4 target IP
129 * @param dport target port
130 * @param data data to send
133 try_send_tcp (uint32_t dst_ipv4,
137 struct GNUNET_NETWORK_Handle *s;
138 struct sockaddr_in sa;
139 struct TcpContext *ctx;
141 s = GNUNET_NETWORK_socket_create (AF_INET,
146 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING,
150 memset (&sa, 0, sizeof (sa));
151 sa.sin_family = AF_INET;
152 #if HAVE_SOCKADDR_IN_SIN_LEN
153 sa.sin_len = sizeof (sa);
155 sa.sin_addr.s_addr = dst_ipv4;
156 sa.sin_port = htons (dport);
157 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
158 "Sending TCP message to `%s'\n",
159 GNUNET_a2s ((struct sockaddr *) &sa,
162 GNUNET_NETWORK_socket_connect (s,
163 (const struct sockaddr *) &sa,
165 (errno != EINPROGRESS) )
167 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING,
169 GNUNET_NETWORK_socket_close (s);
172 ctx = GNUNET_new (struct TcpContext);
175 GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_SECONDS,
183 * Try to send @a data to the
184 * IP @a dst_ipv4 at port @a dport via UDP.
186 * @param dst_ipv4 target IP
187 * @param dport target port
188 * @param data data to send
191 try_send_udp (uint32_t dst_ipv4,
195 struct GNUNET_NETWORK_Handle *s;
196 struct sockaddr_in sa;
198 s = GNUNET_NETWORK_socket_create (AF_INET,
203 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING,
207 memset (&sa, 0, sizeof (sa));
208 sa.sin_family = AF_INET;
209 #if HAVE_SOCKADDR_IN_SIN_LEN
210 sa.sin_len = sizeof (sa);
212 sa.sin_addr.s_addr = dst_ipv4;
213 sa.sin_port = htons (dport);
214 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
215 "Sending UDP packet to `%s'\n",
216 GNUNET_a2s ((struct sockaddr *) &sa,
219 GNUNET_NETWORK_socket_sendto (s,
222 (const struct sockaddr *) &sa,
224 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING,
226 GNUNET_NETWORK_socket_close (s);
231 * We've received a request to probe a NAT
235 * @param client handle to client (we always close)
236 * @param msg message with details about what to test
240 struct GNUNET_SERVER_Client *client,
241 const struct GNUNET_MessageHeader *msg)
243 const struct GNUNET_NAT_TestMessage *tm;
246 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
247 "Received test request\n");
248 tm = (const struct GNUNET_NAT_TestMessage *) msg;
249 dport = ntohs (tm->dport);
251 try_anat (tm->dst_ipv4,
253 (int) ntohl (tm->is_tcp));
254 else if (GNUNET_YES == ntohl (tm->is_tcp))
255 try_send_tcp (tm->dst_ipv4,
259 try_send_udp (tm->dst_ipv4,
262 GNUNET_SERVER_receive_done (client,
268 * Task run during shutdown.
273 shutdown_task (void *cls)
275 GNUNET_SERVER_destroy (server);
281 * Main function that will be run.
284 * @param args remaining command-line arguments
285 * @param cfgfile name of the configuration file used (for saving, can be NULL!)
286 * @param c configuration
292 const struct GNUNET_CONFIGURATION_Handle *c)
294 static const struct GNUNET_SERVER_MessageHandler handlers[] = {
295 {&test, NULL, GNUNET_MESSAGE_TYPE_NAT_TEST,
296 sizeof (struct GNUNET_NAT_TestMessage)},
300 struct sockaddr_in in4;
301 struct sockaddr_in6 in6;
308 struct sockaddr *sa[] = {
309 (struct sockaddr *) &in4,
310 (struct sockaddr *) &in6,
315 if ( (NULL == args[0]) ||
316 (1 != SSCANF (args[0], "%u", &port)) ||
321 _("Please pass valid port number as the first argument! (got `%s')\n"),
325 memset (&in4, 0, sizeof (in4));
326 memset (&in6, 0, sizeof (in6));
327 in4.sin_family = AF_INET;
328 in4.sin_port = htons ((uint16_t) port);
329 in6.sin6_family = AF_INET6;
330 in6.sin6_port = htons ((uint16_t) port);
331 #if HAVE_SOCKADDR_IN_SIN_LEN
332 in4.sin_len = sizeof (in4);
333 in6.sin6_len = sizeof (in6);
335 server = GNUNET_SERVER_create (NULL,
337 (struct sockaddr * const *) sa,
339 GNUNET_TIME_UNIT_SECONDS,
341 GNUNET_SERVER_add_handlers (server,
343 GNUNET_SCHEDULER_add_shutdown (&shutdown_task,
349 * Main function of gnunet-nat-server.
351 * @param argc number of command-line arguments
352 * @param argv command line
353 * @return 0 on success, -1 on error
356 main (int argc, char *const argv[])
358 static const struct GNUNET_GETOPT_CommandLineOption options[] = {
359 GNUNET_GETOPT_OPTION_END
363 GNUNET_STRINGS_get_utf8_args (argc, argv,
368 GNUNET_PROGRAM_run (argc,
370 "gnunet-nat-server [options] PORT",
371 _("GNUnet NAT traversal test helper daemon"),
376 GNUNET_free ((void*) argv);
379 GNUNET_free ((void*) argv);
384 /* end of gnunet-nat-server.c */