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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 \
34 GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_SECONDS, 30)
37 * 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 struct GNUNET_SCHEDULER_Task *rtask;
68 * Entry we keep for each connection to the gnunet-nat-service.
70 struct ClientActivity {
72 * This is a doubly-linked list.
74 struct ClientActivity *next;
77 * This is a doubly-linked list.
79 struct ClientActivity *prev;
82 * Socket of the incoming connection.
84 struct GNUNET_MQ_Handle *mq;
87 * Handle to overall NAT test.
89 struct GNUNET_NAT_Test *h;
94 * Handle to a NAT test.
96 struct GNUNET_NAT_Test {
100 const struct GNUNET_CONFIGURATION_Handle *cfg;
103 * Function to call with success report
105 GNUNET_NAT_TestCallback report;
108 * Closure for @e report.
113 * Handle to NAT traversal in use
115 struct GNUNET_NAT_Handle *nat;
118 * Handle to listen socket, or NULL
120 struct GNUNET_NETWORK_Handle *lsock;
123 * Head of list of nat activities.
125 struct NatActivity *na_head;
128 * Tail of list of nat activities.
130 struct NatActivity *na_tail;
133 * Head of list of client activities.
135 struct ClientActivity *ca_head;
138 * Tail of list of client activities.
140 struct ClientActivity *ca_tail;
143 * Identity of task for the listen socket (if any)
145 struct GNUNET_SCHEDULER_Task *ltask;
148 * Task identifier for the timeout (if any)
150 struct GNUNET_SCHEDULER_Task *ttask;
153 * #GNUNET_YES if we're testing TCP
158 * Data that should be transmitted or source-port.
163 * Advertised port to the other peer.
168 * Status code to be reported to the timeout/status call
170 enum GNUNET_NAT_StatusCode status;
175 * Function called from #GNUNET_NAT_register whenever someone asks us
176 * to do connection reversal.
178 * @param cls closure, our `struct GNUNET_NAT_Handle`
179 * @param addr public IP address of the other peer
180 * @param addrlen actual lenght of the @a addr
183 reversal_cb(void *cls, const struct sockaddr *addr, socklen_t addrlen)
185 struct GNUNET_NAT_Test *h = cls;
186 const struct sockaddr_in *sa;
188 if (sizeof(struct sockaddr_in) != addrlen)
190 sa = (const struct sockaddr_in *)addr;
191 if (h->data != sa->sin_port)
193 LOG(GNUNET_ERROR_TYPE_DEBUG,
194 "Received connection reversal request for wrong port\n");
195 return; /* wrong port */
198 h->report(h->report_cls, GNUNET_NAT_ERROR_SUCCESS);
203 * Activity on our incoming socket. Read data from the
204 * incoming connection.
206 * @param cls the `struct GNUNET_NAT_Test`
209 do_udp_read(void *cls)
211 struct GNUNET_NAT_Test *tst = cls;
213 const struct GNUNET_SCHEDULER_TaskContext *tc;
215 tc = GNUNET_SCHEDULER_get_task_context();
216 tst->ltask = GNUNET_SCHEDULER_add_read_net(GNUNET_TIME_UNIT_FOREVER_REL,
220 if ((NULL != tc->write_ready) &&
221 (GNUNET_NETWORK_fdset_isset(tc->read_ready, tst->lsock)) &&
223 GNUNET_NETWORK_socket_recv(tst->lsock, &data, sizeof(data))))
225 if (data == tst->data)
226 tst->report(tst->report_cls, GNUNET_NAT_ERROR_SUCCESS);
228 LOG(GNUNET_ERROR_TYPE_DEBUG,
229 "Received data mismatches expected value\n");
232 LOG(GNUNET_ERROR_TYPE_DEBUG,
233 "Failed to receive data from inbound connection\n");
238 * Activity on our incoming socket. Read data from the
239 * incoming connection.
241 * @param cls the `struct NatActivity`
246 struct NatActivity *na = cls;
247 struct GNUNET_NAT_Test *tst;
249 const struct GNUNET_SCHEDULER_TaskContext *tc;
251 tc = GNUNET_SCHEDULER_get_task_context();
254 GNUNET_CONTAINER_DLL_remove(tst->na_head, tst->na_tail, na);
255 if ((NULL != tc->write_ready) &&
256 (GNUNET_NETWORK_fdset_isset(tc->read_ready, na->sock)) &&
258 GNUNET_NETWORK_socket_recv(na->sock, &data, sizeof(data))))
260 if (data == tst->data)
261 tst->report(tst->report_cls, GNUNET_NAT_ERROR_SUCCESS);
263 LOG(GNUNET_ERROR_TYPE_DEBUG,
264 "Received data does not match expected value\n");
267 LOG(GNUNET_ERROR_TYPE_DEBUG,
268 "Failed to receive data from inbound connection\n");
269 GNUNET_NETWORK_socket_close(na->sock);
275 * Activity on our listen socket. Accept the
276 * incoming connection.
278 * @param cls the `struct GNUNET_NAT_Test`
283 struct GNUNET_NAT_Test *tst = cls;
284 struct GNUNET_NETWORK_Handle *s;
285 struct NatActivity *wl;
287 tst->ltask = GNUNET_SCHEDULER_add_read_net(GNUNET_TIME_UNIT_FOREVER_REL,
291 s = GNUNET_NETWORK_socket_accept(tst->lsock, NULL, NULL);
294 GNUNET_log_strerror(GNUNET_ERROR_TYPE_INFO, "accept");
295 return; /* odd error */
297 LOG(GNUNET_ERROR_TYPE_DEBUG,
298 "Got an inbound connection, waiting for data\n");
299 wl = GNUNET_new(struct NatActivity);
302 wl->rtask = GNUNET_SCHEDULER_add_read_net(GNUNET_TIME_UNIT_FOREVER_REL,
306 GNUNET_CONTAINER_DLL_insert(tst->na_head, tst->na_tail, wl);
311 * We got disconnected from the NAT server. Stop
312 * waiting for a reply.
314 * @param cls the `struct ClientActivity`
315 * @param error error code
318 mq_error_handler(void *cls, enum GNUNET_MQ_Error error)
320 struct ClientActivity *ca = cls;
321 struct GNUNET_NAT_Test *tst = ca->h;
323 GNUNET_CONTAINER_DLL_remove(tst->ca_head, tst->ca_tail, ca);
324 GNUNET_MQ_destroy(ca->mq);
330 * Address-callback, used to send message to gnunet-nat-server.
333 * @param add_remove #GNUNET_YES to mean the new public IP address, #GNUNET_NO to mean
334 * the previous (now invalid) one
335 * @param addr either the previous or the new public IP address
336 * @param addrlen actual length of the @a addr
341 const struct sockaddr *addr,
344 struct GNUNET_NAT_Test *h = cls;
345 struct ClientActivity *ca;
346 struct GNUNET_MQ_Envelope *env;
347 struct GNUNET_NAT_TestMessage *msg;
348 const struct sockaddr_in *sa;
350 if (GNUNET_YES != add_remove)
352 if (addrlen != sizeof(struct sockaddr_in))
354 LOG(GNUNET_ERROR_TYPE_DEBUG,
355 "NAT test ignores IPv6 address `%s' returned from NAT library\n",
356 GNUNET_a2s(addr, addrlen));
357 return; /* ignore IPv6 here */
359 LOG(GNUNET_ERROR_TYPE_INFO,
360 "Asking gnunet-nat-server to connect to `%s'\n",
361 GNUNET_a2s(addr, addrlen));
363 ca = GNUNET_new(struct ClientActivity);
365 ca->mq = GNUNET_CLIENT_connect(h->cfg,
373 GNUNET_log(GNUNET_ERROR_TYPE_ERROR,
374 _("Failed to connect to `gnunet-nat-server'\n"));
377 GNUNET_CONTAINER_DLL_insert(h->ca_head, h->ca_tail, ca);
378 sa = (const struct sockaddr_in *)addr;
379 env = GNUNET_MQ_msg(msg, GNUNET_MESSAGE_TYPE_NAT_TEST);
380 msg->dst_ipv4 = sa->sin_addr.s_addr;
381 msg->dport = sa->sin_port;
383 msg->is_tcp = htonl((uint32_t)h->is_tcp);
384 GNUNET_MQ_send(ca->mq, env);
389 * Timeout task for a nat test.
390 * Calls the report-callback with a timeout return value
392 * Destroys the nat handle after the callback has been processed.
394 * @param cls handle to the timed out NAT test
397 do_timeout(void *cls)
399 struct GNUNET_NAT_Test *nh = cls;
402 nh->report(nh->report_cls,
403 (GNUNET_NAT_ERROR_SUCCESS == nh->status)
404 ? GNUNET_NAT_ERROR_TIMEOUT
410 * Start testing if NAT traversal works using the
411 * given configuration (IPv4-only).
413 * ALL failures are reported directly to the report callback
415 * @param cfg configuration for the NAT traversal
416 * @param is_tcp #GNUNET_YES to test TCP, #GNUNET_NO to test UDP
417 * @param bnd_port port to bind to, 0 for connection reversal
418 * @param adv_port externally advertised port to use
419 * @param timeout delay after which the test should be aborted
420 * @param report function to call with the result of the test
421 * @param report_cls closure for @a report
422 * @return handle to cancel NAT test or NULL. The error is always indicated via the report callback
424 struct GNUNET_NAT_Test *
425 GNUNET_NAT_test_start(const struct GNUNET_CONFIGURATION_Handle *cfg,
429 struct GNUNET_TIME_Relative timeout,
430 GNUNET_NAT_TestCallback report,
433 struct GNUNET_NAT_Test *nh;
434 struct sockaddr_in sa;
435 const struct sockaddr *addrs[] = { (const struct sockaddr *)&sa };
436 const socklen_t addrlens[] = { sizeof(sa) };
438 memset(&sa, 0, sizeof(sa));
439 sa.sin_family = AF_INET;
440 sa.sin_port = htons(bnd_port);
441 #if HAVE_SOCKADDR_IN_SIN_LEN
442 sa.sin_len = sizeof(sa);
445 nh = GNUNET_new(struct GNUNET_NAT_Test);
449 nh->adv_port = adv_port;
451 nh->report_cls = report_cls;
452 nh->status = GNUNET_NAT_ERROR_SUCCESS;
455 nh->nat = GNUNET_NAT_register(cfg,
469 GNUNET_NETWORK_socket_create(AF_INET,
470 (is_tcp == GNUNET_YES) ? SOCK_STREAM
473 if ((nh->lsock == NULL) ||
474 (GNUNET_OK != GNUNET_NETWORK_socket_bind(nh->lsock,
475 (const struct sockaddr *)&sa,
479 GNUNET_ERROR_TYPE_ERROR,
480 _("Failed to create listen socket bound to `%s' for NAT test: %s\n"),
481 GNUNET_a2s((const struct sockaddr *)&sa, sizeof(sa)),
483 if (NULL != nh->lsock)
485 GNUNET_NETWORK_socket_close(nh->lsock);
488 nh->status = GNUNET_NAT_ERROR_INTERNAL_NETWORK_ERROR;
489 nh->ttask = GNUNET_SCHEDULER_add_now(&do_timeout, nh);
492 if (GNUNET_YES == is_tcp)
494 GNUNET_break(GNUNET_OK == GNUNET_NETWORK_socket_listen(nh->lsock, 5));
495 nh->ltask = GNUNET_SCHEDULER_add_read_net(GNUNET_TIME_UNIT_FOREVER_REL,
502 nh->ltask = GNUNET_SCHEDULER_add_read_net(GNUNET_TIME_UNIT_FOREVER_REL,
507 LOG(GNUNET_ERROR_TYPE_INFO,
508 "NAT test listens on port %u (%s)\n",
510 (GNUNET_YES == is_tcp) ? "tcp" : "udp");
511 nh->nat = GNUNET_NAT_register(cfg,
523 LOG(GNUNET_ERROR_TYPE_INFO,
524 _("NAT test failed to start NAT library\n"));
525 if (NULL != nh->ltask)
527 GNUNET_SCHEDULER_cancel(nh->ltask);
530 if (NULL != nh->lsock)
532 GNUNET_NETWORK_socket_close(nh->lsock);
535 nh->status = GNUNET_NAT_ERROR_NAT_REGISTER_FAILED;
536 nh->ttask = GNUNET_SCHEDULER_add_now(&do_timeout, nh);
540 nh->ttask = GNUNET_SCHEDULER_add_delayed(timeout, &do_timeout, nh);
546 * Stop an active NAT test.
548 * @param tst test to stop.
551 GNUNET_NAT_test_stop(struct GNUNET_NAT_Test *tst)
553 struct NatActivity *pos;
554 struct ClientActivity *cpos;
556 LOG(GNUNET_ERROR_TYPE_DEBUG, "Stopping NAT test\n");
557 while (NULL != (cpos = tst->ca_head))
559 GNUNET_CONTAINER_DLL_remove(tst->ca_head, tst->ca_tail, cpos);
560 GNUNET_MQ_destroy(cpos->mq);
563 while (NULL != (pos = tst->na_head))
565 GNUNET_CONTAINER_DLL_remove(tst->na_head, tst->na_tail, pos);
566 GNUNET_SCHEDULER_cancel(pos->rtask);
567 GNUNET_NETWORK_socket_close(pos->sock);
570 if (NULL != tst->ttask)
572 GNUNET_SCHEDULER_cancel(tst->ttask);
575 if (NULL != tst->ltask)
577 GNUNET_SCHEDULER_cancel(tst->ltask);
580 if (NULL != tst->lsock)
582 GNUNET_NETWORK_socket_close(tst->lsock);
585 if (NULL != tst->nat)
587 GNUNET_NAT_unregister(tst->nat);
593 /* end of nat_test.c */