2 This file is part of GNUnet.
3 (C) 2011 Christian Grothoff (and other contributing authors)
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22 * @file nat/nat_test.c
23 * @brief functions to test if the NAT configuration is successful at achieving NAT traversal (with the help of a gnunet-nat-server)
24 * @author Christian Grothoff
27 #include "gnunet_util_lib.h"
28 #include "gnunet_nat_lib.h"
31 #define LOG(kind,...) GNUNET_log_from (kind, "nat", __VA_ARGS__)
33 #define NAT_SERVER_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 30)
36 * Entry we keep for each incoming connection.
41 * This is a doubly-linked list.
43 struct NatActivity *next;
46 * This is a doubly-linked list.
48 struct NatActivity *prev;
51 * Socket of the incoming connection.
53 struct GNUNET_NETWORK_Handle *sock;
56 * Handle of the master context.
58 struct GNUNET_NAT_Test *h;
61 * Task reading from the incoming connection.
63 GNUNET_SCHEDULER_TaskIdentifier rtask;
68 * Entry we keep for each connection to the gnunet-nat-service.
73 * This is a doubly-linked list.
75 struct ClientActivity *next;
78 * This is a doubly-linked list.
80 struct ClientActivity *prev;
83 * Socket of the incoming connection.
85 struct GNUNET_CLIENT_Connection *client;
91 * Handle to a NAT test.
93 struct GNUNET_NAT_Test
99 const struct GNUNET_CONFIGURATION_Handle *cfg;
102 * Function to call with success report
104 GNUNET_NAT_TestCallback report;
107 * Closure for @e report.
112 * Handle to NAT traversal in use
114 struct GNUNET_NAT_Handle *nat;
117 * Handle to listen socket, or NULL
119 struct GNUNET_NETWORK_Handle *lsock;
122 * Head of list of nat activities.
124 struct NatActivity *na_head;
127 * Tail of list of nat activities.
129 struct NatActivity *na_tail;
132 * Head of list of client activities.
134 struct ClientActivity *ca_head;
137 * Tail of list of client activities.
139 struct ClientActivity *ca_tail;
142 * Identity of task for the listen socket (if any)
144 GNUNET_SCHEDULER_TaskIdentifier ltask;
147 * GNUNET_YES if we're testing TCP
152 * Data that should be transmitted or source-port.
157 * Advertised port to the other peer.
165 * Function called from #GNUNET_NAT_register whenever someone asks us
166 * to do connection reversal.
168 * @param cls closure, our `struct GNUNET_NAT_Handle`
169 * @param addr public IP address of the other peer
170 * @param addrlen actual lenght of the address
173 reversal_cb (void *cls,
174 const struct sockaddr *addr,
177 struct GNUNET_NAT_Test *h = cls;
178 const struct sockaddr_in *sa;
180 if (addrlen != sizeof (struct sockaddr_in))
182 sa = (const struct sockaddr_in *) addr;
183 if (h->data != sa->sin_port)
185 LOG (GNUNET_ERROR_TYPE_DEBUG,
186 "Received connection reversal request for wrong port\n");
187 return; /* wrong port */
190 h->report (h->report_cls, GNUNET_OK);
195 * Activity on our incoming socket. Read data from the
196 * incoming connection.
198 * @param cls the `struct GNUNET_NAT_Test`
199 * @param tc scheduler context
202 do_udp_read (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
204 struct GNUNET_NAT_Test *tst = cls;
208 GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
211 if ((NULL != tc->write_ready) &&
212 (GNUNET_NETWORK_fdset_isset (tc->read_ready, tst->lsock)) &&
214 GNUNET_NETWORK_socket_recv (tst->lsock, &data, sizeof (data))))
216 if (data == tst->data)
217 tst->report (tst->report_cls, GNUNET_OK);
219 LOG (GNUNET_ERROR_TYPE_DEBUG,
220 "Received data mismatches expected value\n");
223 LOG (GNUNET_ERROR_TYPE_DEBUG,
224 "Failed to receive data from inbound connection\n");
229 * Activity on our incoming socket. Read data from the
230 * incoming connection.
232 * @param cls the `struct NatActivity`
233 * @param tc scheduler context
237 const struct GNUNET_SCHEDULER_TaskContext *tc)
239 struct NatActivity *na = cls;
240 struct GNUNET_NAT_Test *tst;
243 na->rtask = GNUNET_SCHEDULER_NO_TASK;
245 GNUNET_CONTAINER_DLL_remove (tst->na_head, tst->na_tail, na);
246 if ((NULL != tc->write_ready) &&
247 (GNUNET_NETWORK_fdset_isset (tc->read_ready, na->sock)) &&
249 GNUNET_NETWORK_socket_recv (na->sock, &data, sizeof (data))))
251 if (data == tst->data)
252 tst->report (tst->report_cls, GNUNET_OK);
254 LOG (GNUNET_ERROR_TYPE_DEBUG,
255 "Received data mismatches expected value\n");
258 LOG (GNUNET_ERROR_TYPE_DEBUG,
259 "Failed to receive data from inbound connection\n");
260 GNUNET_NETWORK_socket_close (na->sock);
266 * Activity on our listen socket. Accept the
267 * incoming connection.
269 * @param cls the `struct GNUNET_NAT_Test`
270 * @param tc scheduler context
273 do_accept (void *cls,
274 const struct GNUNET_SCHEDULER_TaskContext *tc)
276 struct GNUNET_NAT_Test *tst = cls;
277 struct GNUNET_NETWORK_Handle *s;
278 struct NatActivity *wl;
280 tst->ltask = GNUNET_SCHEDULER_NO_TASK;
281 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
284 GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL, tst->lsock,
286 s = GNUNET_NETWORK_socket_accept (tst->lsock, NULL, NULL);
289 GNUNET_log_strerror (GNUNET_ERROR_TYPE_INFO, "accept");
290 return; /* odd error */
292 LOG (GNUNET_ERROR_TYPE_DEBUG,
293 "Got an inbound connection, waiting for data\n");
294 wl = GNUNET_new (struct NatActivity);
298 GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL, wl->sock,
300 GNUNET_CONTAINER_DLL_insert (tst->na_head, tst->na_tail, wl);
305 * Address-callback, used to send message to gnunet-nat-server.
308 * @param add_remove #GNUNET_YES to mean the new public IP address, #GNUNET_NO to mean
309 * the previous (now invalid) one
310 * @param addr either the previous or the new public IP address
311 * @param addrlen actual length of the @a addr
316 const struct sockaddr *addr,
319 struct GNUNET_NAT_Test *h = cls;
320 struct ClientActivity *ca;
321 struct GNUNET_CLIENT_Connection *client;
322 struct GNUNET_NAT_TestMessage msg;
323 const struct sockaddr_in *sa;
325 if (GNUNET_YES != add_remove)
327 if (addrlen != sizeof (struct sockaddr_in))
329 LOG (GNUNET_ERROR_TYPE_DEBUG,
330 "NAT test ignores IPv6 address `%s' returned from NAT library\n",
331 GNUNET_a2s (addr, addrlen));
332 return; /* ignore IPv6 here */
334 LOG (GNUNET_ERROR_TYPE_DEBUG, "Asking gnunet-nat-server to connect to `%s'\n",
335 GNUNET_a2s (addr, addrlen));
336 sa = (const struct sockaddr_in *) addr;
337 msg.header.size = htons (sizeof (struct GNUNET_NAT_TestMessage));
338 msg.header.type = htons (GNUNET_MESSAGE_TYPE_NAT_TEST);
339 msg.dst_ipv4 = sa->sin_addr.s_addr;
340 msg.dport = sa->sin_port;
342 msg.is_tcp = htonl ((uint32_t) h->is_tcp);
344 client = GNUNET_CLIENT_connect ("gnunet-nat-server", h->cfg);
347 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
348 _("Failed to connect to `gnunet-nat-server'\n"));
351 ca = GNUNET_new (struct ClientActivity);
353 GNUNET_CONTAINER_DLL_insert (h->ca_head, h->ca_tail, ca);
354 GNUNET_break (GNUNET_OK ==
355 GNUNET_CLIENT_transmit_and_get_response (client, &msg.header,
363 * Start testing if NAT traversal works using the
364 * given configuration (IPv4-only).
366 * @param cfg configuration for the NAT traversal
367 * @param is_tcp #GNUNET_YES to test TCP, #GNUNET_NO to test UDP
368 * @param bnd_port port to bind to, 0 for connection reversal
369 * @param adv_port externally advertised port to use
370 * @param report function to call with the result of the test
371 * @param report_cls closure for @a report
372 * @return handle to cancel NAT test
374 struct GNUNET_NAT_Test *
375 GNUNET_NAT_test_start (const struct GNUNET_CONFIGURATION_Handle *cfg,
379 GNUNET_NAT_TestCallback report,
382 struct GNUNET_NAT_Test *ret;
383 struct sockaddr_in sa;
384 const struct sockaddr *addrs[] = { (const struct sockaddr *) &sa };
385 const socklen_t addrlens[] = { sizeof (sa) };
387 memset (&sa, 0, sizeof (sa));
388 sa.sin_family = AF_INET;
389 sa.sin_port = htons (bnd_port);
390 #if HAVE_SOCKADDR_IN_SIN_LEN
391 sa.sin_len = sizeof (sa);
394 ret = GNUNET_new (struct GNUNET_NAT_Test);
396 ret->is_tcp = is_tcp;
397 ret->data = bnd_port;
398 ret->adv_port = adv_port;
399 ret->report = report;
400 ret->report_cls = report_cls;
404 GNUNET_NAT_register (cfg, is_tcp, 0, 0, NULL, NULL, &addr_cb,
410 GNUNET_NETWORK_socket_create (AF_INET,
412 GNUNET_YES) ? SOCK_STREAM : SOCK_DGRAM,
414 if ((ret->lsock == NULL) ||
416 GNUNET_NETWORK_socket_bind (ret->lsock, (const struct sockaddr *) &sa,
419 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
420 _("Failed to create listen socket bound to `%s' for NAT test: %s\n"),
421 GNUNET_a2s ((const struct sockaddr *) &sa, sizeof (sa)),
423 if (NULL != ret->lsock)
424 GNUNET_NETWORK_socket_close (ret->lsock);
428 if (GNUNET_YES == is_tcp)
430 GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_listen (ret->lsock, 5));
432 GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
433 ret->lsock, &do_accept, ret);
438 GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
439 ret->lsock, &do_udp_read, ret);
441 LOG (GNUNET_ERROR_TYPE_DEBUG,
442 "NAT test listens on port %u (%s)\n",
444 (GNUNET_YES == is_tcp) ? "tcp" : "udp");
446 GNUNET_NAT_register (cfg, is_tcp, adv_port, 1, addrs, addrlens,
447 &addr_cb, NULL, ret);
454 * Stop an active NAT test.
456 * @param tst test to stop.
459 GNUNET_NAT_test_stop (struct GNUNET_NAT_Test *tst)
461 struct NatActivity *pos;
462 struct ClientActivity *cpos;
464 LOG (GNUNET_ERROR_TYPE_DEBUG,
465 "Stopping NAT test\n");
466 while (NULL != (cpos = tst->ca_head))
468 GNUNET_CONTAINER_DLL_remove (tst->ca_head, tst->ca_tail, cpos);
469 GNUNET_CLIENT_disconnect (cpos->client);
472 while (NULL != (pos = tst->na_head))
474 GNUNET_CONTAINER_DLL_remove (tst->na_head, tst->na_tail, pos);
475 GNUNET_SCHEDULER_cancel (pos->rtask);
476 GNUNET_NETWORK_socket_close (pos->sock);
479 if (GNUNET_SCHEDULER_NO_TASK != tst->ltask)
480 GNUNET_SCHEDULER_cancel (tst->ltask);
481 if (NULL != tst->lsock)
482 GNUNET_NETWORK_socket_close (tst->lsock);
483 GNUNET_NAT_unregister (tst->nat);
487 /* end of nat_test.c */