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 '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, const struct sockaddr *addr, socklen_t addrlen)
175 struct GNUNET_NAT_Test *h = cls;
176 const struct sockaddr_in *sa;
178 if (addrlen != sizeof (struct sockaddr_in))
180 sa = (const struct sockaddr_in *) addr;
181 if (h->data != sa->sin_port)
184 LOG (GNUNET_ERROR_TYPE_DEBUG,
185 "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 NatActivity'
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, tst->lsock,
210 if ((NULL != tc->write_ready) &&
211 (GNUNET_NETWORK_fdset_isset (tc->read_ready, tst->lsock)) &&
213 GNUNET_NETWORK_socket_recv (tst->lsock, &data, sizeof (data))))
215 if (data == tst->data)
216 tst->report (tst->report_cls, GNUNET_OK);
219 LOG (GNUNET_ERROR_TYPE_DEBUG,
220 "Received data mismatches expected value\n");
225 LOG (GNUNET_ERROR_TYPE_DEBUG,
226 "Failed to receive data from inbound connection\n");
232 * Activity on our incoming socket. Read data from the
233 * incoming connection.
235 * @param cls the 'struct NatActivity'
236 * @param tc scheduler context
239 do_read (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
241 struct NatActivity *na = cls;
242 struct GNUNET_NAT_Test *tst;
245 na->rtask = GNUNET_SCHEDULER_NO_TASK;
247 GNUNET_CONTAINER_DLL_remove (tst->na_head, tst->na_tail, na);
248 if ((NULL != tc->write_ready) &&
249 (GNUNET_NETWORK_fdset_isset (tc->read_ready, na->sock)) &&
251 GNUNET_NETWORK_socket_recv (na->sock, &data, sizeof (data))))
253 if (data == tst->data)
254 tst->report (tst->report_cls, GNUNET_OK);
257 LOG (GNUNET_ERROR_TYPE_DEBUG,
258 "Received data mismatches expected value\n");
263 LOG (GNUNET_ERROR_TYPE_DEBUG,
264 "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, const struct GNUNET_SCHEDULER_TaskContext *tc)
281 struct GNUNET_NAT_Test *tst = cls;
282 struct GNUNET_NETWORK_Handle *s;
283 struct NatActivity *wl;
285 tst->ltask = GNUNET_SCHEDULER_NO_TASK;
286 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
289 GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL, tst->lsock,
291 s = GNUNET_NETWORK_socket_accept (tst->lsock, NULL, NULL);
294 GNUNET_log_strerror (GNUNET_ERROR_TYPE_INFO, "accept");
295 return; /* odd error */
298 LOG (GNUNET_ERROR_TYPE_DEBUG,
299 "Got an inbound connection, waiting for data\n");
301 wl = GNUNET_malloc (sizeof (struct NatActivity));
305 GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL, wl->sock,
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 lenght of the address
321 addr_cb (void *cls, int add_remove, const struct sockaddr *addr,
324 struct GNUNET_NAT_Test *h = cls;
325 struct ClientActivity *ca;
326 struct GNUNET_CLIENT_Connection *client;
327 struct GNUNET_NAT_TestMessage msg;
328 const struct sockaddr_in *sa;
330 if (GNUNET_YES != add_remove)
332 if (addrlen != sizeof (struct sockaddr_in))
333 return; /* ignore IPv6 here */
335 LOG (GNUNET_ERROR_TYPE_DEBUG, "Asking gnunet-nat-server to connect to `%s'\n",
336 GNUNET_a2s (addr, addrlen));
338 sa = (const struct sockaddr_in *) addr;
339 msg.header.size = htons (sizeof (struct GNUNET_NAT_TestMessage));
340 msg.header.type = htons (GNUNET_MESSAGE_TYPE_NAT_TEST);
341 msg.dst_ipv4 = sa->sin_addr.s_addr;
342 msg.dport = sa->sin_port;
344 msg.is_tcp = htonl ((uint32_t) h->is_tcp);
346 client = GNUNET_CLIENT_connect ("gnunet-nat-server", h->cfg);
349 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
350 _("Failed to connect to `gnunet-nat-server'\n"));
353 ca = GNUNET_malloc (sizeof (struct ClientActivity));
355 GNUNET_CONTAINER_DLL_insert (h->ca_head, h->ca_tail, ca);
356 GNUNET_break (GNUNET_OK ==
357 GNUNET_CLIENT_transmit_and_get_response (client, &msg.header,
365 * Start testing if NAT traversal works using the
366 * given configuration (IPv4-only).
368 * @param cfg configuration for the NAT traversal
369 * @param is_tcp GNUNET_YES to test TCP, GNUNET_NO to test UDP
370 * @param bnd_port port to bind to, 0 for connection reversal
371 * @param adv_port externally advertised port to use
372 * @param report function to call with the result of the test
373 * @param report_cls closure for report
374 * @return handle to cancel NAT test
376 struct GNUNET_NAT_Test *
377 GNUNET_NAT_test_start (const struct GNUNET_CONFIGURATION_Handle *cfg,
378 int is_tcp, uint16_t bnd_port, uint16_t adv_port,
379 GNUNET_NAT_TestCallback report, void *report_cls)
381 struct GNUNET_NAT_Test *ret;
382 struct sockaddr_in sa;
383 const struct sockaddr *addrs[] = { (const struct sockaddr *) &sa };
384 const socklen_t addrlens[] = { sizeof (sa) };
386 memset (&sa, 0, sizeof (sa));
387 sa.sin_family = AF_INET;
388 sa.sin_port = htons (bnd_port);
389 #if HAVE_SOCKADDR_IN_SIN_LEN
390 sa.sin_len = sizeof (sa);
393 ret = GNUNET_malloc (sizeof (struct GNUNET_NAT_Test));
395 ret->is_tcp = is_tcp;
396 ret->data = bnd_port;
397 ret->adv_port = adv_port;
398 ret->report = report;
399 ret->report_cls = report_cls;
403 GNUNET_NAT_register (cfg, is_tcp, 0, 0, NULL, NULL, &addr_cb,
409 GNUNET_NETWORK_socket_create (AF_INET,
411 GNUNET_YES) ? SOCK_STREAM : SOCK_DGRAM,
413 if ((ret->lsock == NULL) ||
415 GNUNET_NETWORK_socket_bind (ret->lsock, (const struct sockaddr *) &sa,
418 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);
442 GNUNET_NAT_register (cfg, is_tcp, adv_port, 1, addrs, addrlens,
443 &addr_cb, NULL, ret);
450 * Stop an active NAT test.
452 * @param tst test to stop.
455 GNUNET_NAT_test_stop (struct GNUNET_NAT_Test *tst)
457 struct NatActivity *pos;
458 struct ClientActivity *cpos;
460 while (NULL != (cpos = tst->ca_head))
462 GNUNET_CONTAINER_DLL_remove (tst->ca_head, tst->ca_tail, cpos);
463 GNUNET_CLIENT_disconnect (cpos->client, GNUNET_NO);
466 while (NULL != (pos = tst->na_head))
468 GNUNET_CONTAINER_DLL_remove (tst->na_head, tst->na_tail, pos);
469 GNUNET_SCHEDULER_cancel (pos->rtask);
470 GNUNET_NETWORK_socket_close (pos->sock);
473 if (GNUNET_SCHEDULER_NO_TASK != tst->ltask)
474 GNUNET_SCHEDULER_cancel (tst->ltask);
475 if (NULL != tst->lsock)
476 GNUNET_NETWORK_socket_close (tst->lsock);
477 GNUNET_NAT_unregister (tst->nat);
481 /* end of nat_test.c */