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 * Task identifier for the timeout (if any)
149 GNUNET_SCHEDULER_TaskIdentifier ttask;
152 * GNUNET_YES if we're testing TCP
157 * Data that should be transmitted or source-port.
162 * Advertised port to the other peer.
170 * Function called from #GNUNET_NAT_register whenever someone asks us
171 * to do connection reversal.
173 * @param cls closure, our `struct GNUNET_NAT_Handle`
174 * @param addr public IP address of the other peer
175 * @param addrlen actual lenght of the address
178 reversal_cb (void *cls,
179 const struct sockaddr *addr,
182 struct GNUNET_NAT_Test *h = cls;
183 const struct sockaddr_in *sa;
185 if (sizeof (struct sockaddr_in) != addrlen)
187 sa = (const struct sockaddr_in *) addr;
188 if (h->data != sa->sin_port)
190 LOG (GNUNET_ERROR_TYPE_DEBUG,
191 "Received connection reversal request for wrong port\n");
192 return; /* wrong port */
195 h->report (h->report_cls, GNUNET_NAT_ERROR_SUCCESS);
200 * Activity on our incoming socket. Read data from the
201 * incoming connection.
203 * @param cls the `struct GNUNET_NAT_Test`
204 * @param tc scheduler context
207 do_udp_read (void *cls,
208 const struct GNUNET_SCHEDULER_TaskContext *tc)
210 struct GNUNET_NAT_Test *tst = cls;
214 GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
217 if ((NULL != tc->write_ready) &&
218 (GNUNET_NETWORK_fdset_isset (tc->read_ready, tst->lsock)) &&
220 GNUNET_NETWORK_socket_recv (tst->lsock, &data, sizeof (data))))
222 if (data == tst->data)
223 tst->report (tst->report_cls, GNUNET_NAT_ERROR_SUCCESS);
225 LOG (GNUNET_ERROR_TYPE_DEBUG,
226 "Received data mismatches expected value\n");
229 LOG (GNUNET_ERROR_TYPE_DEBUG,
230 "Failed to receive data from inbound connection\n");
235 * Activity on our incoming socket. Read data from the
236 * incoming connection.
238 * @param cls the `struct NatActivity`
239 * @param tc scheduler context
243 const struct GNUNET_SCHEDULER_TaskContext *tc)
245 struct NatActivity *na = cls;
246 struct GNUNET_NAT_Test *tst;
249 na->rtask = GNUNET_SCHEDULER_NO_TASK;
251 GNUNET_CONTAINER_DLL_remove (tst->na_head, tst->na_tail, na);
252 if ((NULL != tc->write_ready) &&
253 (GNUNET_NETWORK_fdset_isset (tc->read_ready, na->sock)) &&
255 GNUNET_NETWORK_socket_recv (na->sock, &data, sizeof (data))))
257 if (data == tst->data)
258 tst->report (tst->report_cls, GNUNET_NAT_ERROR_SUCCESS);
260 LOG (GNUNET_ERROR_TYPE_DEBUG,
261 "Received data does not match expected value\n");
264 LOG (GNUNET_ERROR_TYPE_DEBUG,
265 "Failed to receive data from inbound connection\n");
266 GNUNET_NETWORK_socket_close (na->sock);
272 * Activity on our listen socket. Accept the
273 * incoming connection.
275 * @param cls the `struct GNUNET_NAT_Test`
276 * @param tc scheduler context
279 do_accept (void *cls,
280 const struct GNUNET_SCHEDULER_TaskContext *tc)
282 struct GNUNET_NAT_Test *tst = cls;
283 struct GNUNET_NETWORK_Handle *s;
284 struct NatActivity *wl;
286 tst->ltask = GNUNET_SCHEDULER_NO_TASK;
287 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
290 GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL, tst->lsock,
292 s = GNUNET_NETWORK_socket_accept (tst->lsock, NULL, NULL);
295 GNUNET_log_strerror (GNUNET_ERROR_TYPE_INFO, "accept");
296 return; /* odd error */
298 LOG (GNUNET_ERROR_TYPE_DEBUG,
299 "Got an inbound connection, waiting for data\n");
300 wl = GNUNET_new (struct NatActivity);
304 GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
307 GNUNET_CONTAINER_DLL_insert (tst->na_head, tst->na_tail, wl);
312 * Address-callback, used to send message to gnunet-nat-server.
315 * @param add_remove #GNUNET_YES to mean the new public IP address, #GNUNET_NO to mean
316 * the previous (now invalid) one
317 * @param addr either the previous or the new public IP address
318 * @param addrlen actual length of the @a addr
323 const struct sockaddr *addr,
326 struct GNUNET_NAT_Test *h = cls;
327 struct ClientActivity *ca;
328 struct GNUNET_CLIENT_Connection *client;
329 struct GNUNET_NAT_TestMessage msg;
330 const struct sockaddr_in *sa;
332 if (GNUNET_YES != add_remove)
334 if (addrlen != sizeof (struct sockaddr_in))
336 LOG (GNUNET_ERROR_TYPE_DEBUG,
337 "NAT test ignores IPv6 address `%s' returned from NAT library\n",
338 GNUNET_a2s (addr, addrlen));
339 return; /* ignore IPv6 here */
341 LOG (GNUNET_ERROR_TYPE_INFO,
342 "Asking gnunet-nat-server to connect to `%s'\n",
343 GNUNET_a2s (addr, addrlen));
344 sa = (const struct sockaddr_in *) addr;
345 msg.header.size = htons (sizeof (struct GNUNET_NAT_TestMessage));
346 msg.header.type = htons (GNUNET_MESSAGE_TYPE_NAT_TEST);
347 msg.dst_ipv4 = sa->sin_addr.s_addr;
348 msg.dport = sa->sin_port;
350 msg.is_tcp = htonl ((uint32_t) h->is_tcp);
352 client = GNUNET_CLIENT_connect ("gnunet-nat-server", h->cfg);
355 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
356 _("Failed to connect to `gnunet-nat-server'\n"));
359 ca = GNUNET_new (struct ClientActivity);
361 GNUNET_CONTAINER_DLL_insert (h->ca_head, h->ca_tail, ca);
362 GNUNET_break (GNUNET_OK ==
363 GNUNET_CLIENT_transmit_and_get_response (client, &msg.header,
371 * Timeout task for a nat test.
372 * Calls the report-callback with a timeout return value
374 * @param cls handle to the timed out NAT test
378 do_timeout (void *cls,
379 const struct GNUNET_SCHEDULER_TaskContext * tc)
381 struct GNUNET_NAT_Test *nh = (struct GNUNET_NAT_Test *) cls;
383 nh->ttask = GNUNET_SCHEDULER_NO_TASK;
384 nh->report (nh->report_cls, GNUNET_NAT_ERROR_TIMEOUT);
386 GNUNET_NAT_test_stop(nh);
391 * Start testing if NAT traversal works using the
392 * given configuration (IPv4-only).
394 * ALL failures are reported directly to the report callback
396 * @param cfg configuration for the NAT traversal
397 * @param is_tcp #GNUNET_YES to test TCP, #GNUNET_NO to test UDP
398 * @param bnd_port port to bind to, 0 for connection reversal
399 * @param adv_port externally advertised port to use
400 * @param timeout delay after which the test should be aborted
401 * @param report function to call with the result of the test
402 * @param report_cls closure for @a report
403 * @return handle to cancel NAT test
405 struct GNUNET_NAT_Test *
406 GNUNET_NAT_test_start (const struct GNUNET_CONFIGURATION_Handle *cfg,
410 struct GNUNET_TIME_Relative timeout,
411 GNUNET_NAT_TestCallback report,
414 struct GNUNET_NAT_Test *nh;
415 struct sockaddr_in sa;
416 const struct sockaddr *addrs[] = { (const struct sockaddr *) &sa };
417 const socklen_t addrlens[] = { sizeof (sa) };
419 memset (&sa, 0, sizeof (sa));
420 sa.sin_family = AF_INET;
421 sa.sin_port = htons (bnd_port);
422 #if HAVE_SOCKADDR_IN_SIN_LEN
423 sa.sin_len = sizeof (sa);
426 nh = GNUNET_new (struct GNUNET_NAT_Test);
430 nh->adv_port = adv_port;
432 nh->report_cls = report_cls;
433 nh->ttask = GNUNET_SCHEDULER_NO_TASK;
437 GNUNET_NAT_register (cfg, is_tcp, 0, 0, NULL, NULL, &addr_cb,
443 GNUNET_NETWORK_socket_create (AF_INET,
445 GNUNET_YES) ? SOCK_STREAM : SOCK_DGRAM,
447 if ((nh->lsock == NULL) ||
449 GNUNET_NETWORK_socket_bind (nh->lsock, (const struct sockaddr *) &sa,
452 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
453 _("Failed to create listen socket bound to `%s' for NAT test: %s\n"),
454 GNUNET_a2s ((const struct sockaddr *) &sa, sizeof (sa)),
456 if (NULL != nh->lsock)
457 GNUNET_NETWORK_socket_close (nh->lsock);
461 if (GNUNET_YES == is_tcp)
463 GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_listen (nh->lsock, 5));
465 GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
466 nh->lsock, &do_accept, nh);
471 GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
472 nh->lsock, &do_udp_read, nh);
474 LOG (GNUNET_ERROR_TYPE_DEBUG,
475 "NAT test listens on port %u (%s)\n",
477 (GNUNET_YES == is_tcp) ? "tcp" : "udp");
478 nh->nat = GNUNET_NAT_register (cfg, is_tcp, adv_port, 1, addrs, addrlens,
482 LOG (GNUNET_ERROR_TYPE_ERROR,
483 _("NAT test failed to start NAT library\n"));
484 if (GNUNET_SCHEDULER_NO_TASK != nh->ltask)
485 GNUNET_SCHEDULER_cancel (nh->ltask);
486 if (NULL != nh->lsock)
487 GNUNET_NETWORK_socket_close (nh->lsock);
492 nh->ttask = GNUNET_SCHEDULER_add_delayed (timeout, &do_timeout, nh);
498 * Stop an active NAT test.
500 * @param tst test to stop.
503 GNUNET_NAT_test_stop (struct GNUNET_NAT_Test *tst)
505 struct NatActivity *pos;
506 struct ClientActivity *cpos;
508 LOG (GNUNET_ERROR_TYPE_DEBUG,
509 "Stopping NAT test\n");
510 while (NULL != (cpos = tst->ca_head))
512 GNUNET_CONTAINER_DLL_remove (tst->ca_head, tst->ca_tail, cpos);
513 GNUNET_CLIENT_disconnect (cpos->client);
516 while (NULL != (pos = tst->na_head))
518 GNUNET_CONTAINER_DLL_remove (tst->na_head, tst->na_tail, pos);
519 GNUNET_SCHEDULER_cancel (pos->rtask);
520 GNUNET_NETWORK_socket_close (pos->sock);
523 if (GNUNET_SCHEDULER_NO_TASK != tst->ttask)
524 GNUNET_SCHEDULER_cancel (tst->ttask);
525 if (GNUNET_SCHEDULER_NO_TASK != tst->ltask)
526 GNUNET_SCHEDULER_cancel (tst->ltask);
527 if (NULL != tst->lsock)
528 GNUNET_NETWORK_socket_close (tst->lsock);
529 GNUNET_NAT_unregister (tst->nat);
533 /* end of nat_test.c */