2 This file is part of GNUnet.
3 (C) 2012 Christian Grothoff (and other contributing authors)
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22 * @file nat/nat_auto.c
23 * @brief functions for auto-configuration of the network
24 * @author Christian Grothoff
27 #include "gnunet_util_lib.h"
28 #include "gnunet_resolver_service.h"
29 #include "gnunet_nat_lib.h"
32 #define LOG(kind,...) GNUNET_log_from (kind, "nat", __VA_ARGS__)
36 * How long do we wait for the NAT test to report success?
38 #define TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 15)
41 * Phases of the auto configuration.
46 * Initial start value.
51 * Test if we are online.
56 * Test our external IP.
61 * Test our internal IP.
66 * Test if NAT was punched.
71 * Test if UPnP is working.
76 * Test if ICMP server works.
81 * Test if ICMP client works.
86 * Last phase, we're done.
94 * Handle to auto-configuration in progress.
96 struct GNUNET_NAT_AutoHandle
100 * Handle to the active NAT test.
102 struct GNUNET_NAT_Test *tst;
105 * Function to call when done.
107 GNUNET_NAT_AutoResultCallback fin_cb;
110 * Closure for @e fin_cb.
115 * Handle for active 'GNUNET_NAT_mini_get_external_ipv4'-operation.
117 struct GNUNET_NAT_ExternalHandle *eh;
120 * Current configuration (with updates from previous phases)
122 struct GNUNET_CONFIGURATION_Handle *cfg;
125 * Original configuration (used to calculate differences)
127 struct GNUNET_CONFIGURATION_Handle *initial_cfg;
130 * Task identifier for the timeout.
132 GNUNET_SCHEDULER_TaskIdentifier task;
135 * Where are we in the test?
137 enum AutoPhase phase;
148 * Run the next phase of the auto test.
150 * @param ah auto test handle
153 next_phase (struct GNUNET_NAT_AutoHandle *ah);
157 * Function called if NAT failed to confirm success.
158 * Clean up and update GUI (with failure).
160 * @param cls closure with setup context
161 * @param tc scheduler callback
164 fail_timeout (void *cls,
165 const struct GNUNET_SCHEDULER_TaskContext *tc)
167 struct GNUNET_NAT_AutoHandle *ah = cls;
169 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
170 _("NAT traversal with ICMP Server timed out.\n"));
171 GNUNET_assert (NULL != ah->tst);
172 ah->task = GNUNET_SCHEDULER_NO_TASK;
173 GNUNET_NAT_test_stop (ah->tst);
175 GNUNET_CONFIGURATION_set_value_string (ah->cfg, "nat",
176 "ENABLE_ICMP_SERVER",
183 * Function called by NAT on success.
184 * Clean up and update GUI (with success).
186 * @param cls the auto handle
187 * @param success currently always #GNUNET_OK
188 * @param emsg NULL on success, otherwise an error message
191 result_callback (void *cls,
192 enum GNUNET_NAT_FailureCode ret)
194 struct GNUNET_NAT_AutoHandle *ah = cls;
196 GNUNET_SCHEDULER_cancel (ah->task);
197 ah->task = GNUNET_SCHEDULER_NO_TASK;
198 GNUNET_NAT_test_stop (ah->tst);
200 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
202 ? _("NAT traversal with ICMP Server succeeded.\n")
203 : _("NAT traversal with ICMP Server failed.\n"));
204 GNUNET_CONFIGURATION_set_value_string (ah->cfg, "nat", "ENABLE_ICMP_SERVER",
211 * Main function for the connection reversal test.
213 * @param cls the `struct GNUNET_NAT_AutoHandle`
214 * @param tc scheduler context
217 reversal_test (void *cls,
218 const struct GNUNET_SCHEDULER_TaskContext *tc)
220 struct GNUNET_NAT_AutoHandle *ah = cls;
222 ah->task = GNUNET_SCHEDULER_NO_TASK;
223 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
224 _("Testing connection reversal with ICMP server.\n"));
225 GNUNET_RESOLVER_connect (ah->cfg);
226 ah->tst = GNUNET_NAT_test_start (ah->cfg, GNUNET_YES, 0, 0,
227 &result_callback, ah);
233 ah->task = GNUNET_SCHEDULER_add_delayed (TIMEOUT, &fail_timeout, ah);
238 * Test if we are online at all.
240 * @param ah auto setup context
243 test_online (struct GNUNET_NAT_AutoHandle *ah)
245 // FIXME: not implemented
251 * Set our external IPv4 address.
253 * @param cls closure with our setup context
254 * @param addr the address, NULL on errors
255 * @param emsg NULL on success, otherwise an error message
258 set_external_ipv4 (void *cls,
259 const struct in_addr *addr,
260 enum GNUNET_NAT_FailureCode ret)
262 struct GNUNET_NAT_AutoHandle *ah = cls;
263 char buf[INET_ADDRSTRLEN];
271 /* enable 'behind nat' */
272 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
273 _("Detected external IP `%s'\n"),
278 GNUNET_CONFIGURATION_set_value_string (ah->cfg, "nat", "BEHIND_NAT", "YES");
280 /* set external IP address */
281 if (NULL == inet_ntop (AF_INET, addr, buf, sizeof (buf)))
287 GNUNET_CONFIGURATION_set_value_string (ah->cfg, "nat", "EXTERNAL_ADDRESS",
294 * Determine our external IPv4 address.
296 * @param ah auto setup context
299 test_external_ip (struct GNUNET_NAT_AutoHandle *ah)
302 /* try to detect external IP */
303 ah->eh = GNUNET_NAT_mini_get_external_ipv4 (TIMEOUT,
304 &set_external_ipv4, ah);
309 * Process list of local IP addresses. Find and set the
310 * one of the default interface.
312 * @param cls our `struct GNUNET_NAT_AutoHandle`
313 * @param name name of the interface (can be NULL for unknown)
314 * @param isDefault is this presumably the default interface
315 * @param addr address of this interface (can be NULL for unknown or unassigned)
316 * @param broadcast_addr the broadcast address (can be NULL for unknown or unassigned)
317 * @param netmask the network mask (can be NULL for unknown or unassigned))
318 * @param addrlen length of the @a addr and @a broadcast_addr
319 * @return GNUNET_OK to continue iteration, #GNUNET_SYSERR to abort
325 const struct sockaddr *addr,
326 const struct sockaddr *broadcast_addr,
327 const struct sockaddr *netmask,
330 struct GNUNET_NAT_AutoHandle *ah = cls;
331 const struct sockaddr_in *in;
332 char buf[INET_ADDRSTRLEN];
336 if ( (sizeof (struct sockaddr_in6) == addrlen) &&
337 (0 != memcmp (&in6addr_loopback, &((const struct sockaddr_in6 *) addr)->sin6_addr,
338 sizeof (struct in6_addr))) &&
339 (! IN6_IS_ADDR_LINKLOCAL(&((const struct sockaddr_in6 *) addr)->sin6_addr)) )
341 ah->have_v6 = GNUNET_YES;
342 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
343 _("This system has a global IPv6 address, setting IPv6 to supported.\n"));
346 if (addrlen != sizeof (struct sockaddr_in))
348 in = (const struct sockaddr_in *) addr;
350 /* set internal IP address */
351 if (NULL == inet_ntop (AF_INET, &in->sin_addr, buf, sizeof (buf)))
356 GNUNET_CONFIGURATION_set_value_string (ah->cfg, "nat", "INTERNAL_ADDRESS",
358 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
359 _("Detected internal network address `%s'.\n"),
361 /* no need to continue iteration */
362 return GNUNET_SYSERR;
367 * Determine our local IP addresses; detect internal IP & IPv6-support
369 * @param ah auto setup context
372 test_local_ip (struct GNUNET_NAT_AutoHandle *ah)
374 ah->have_v6 = GNUNET_NO;
375 GNUNET_OS_network_interfaces_list (&nipo, ah);
376 GNUNET_CONFIGURATION_set_value_string (ah->cfg, "nat", "DISABLEV6",
377 (GNUNET_YES == ah->have_v6) ? "NO" : "YES");
383 * Test if NAT has been punched
385 * @param ah auto setup context
388 test_nat_punched (struct GNUNET_NAT_AutoHandle *ah)
390 // FIXME: not implemented
396 * Test if UPnPC works.
398 * @param ah auto setup context
401 test_upnpc (struct GNUNET_NAT_AutoHandle *ah)
405 /* test if upnpc is available */
406 have_upnpc = (GNUNET_SYSERR !=
407 GNUNET_OS_check_helper_binary ("upnpc", GNUNET_NO, NULL));
408 /* FIXME: test if upnpc is actually working, that is, if transports
409 start to work once we use UPnP */
410 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
412 ? _("upnpc found, enabling its use\n")
413 : _("upnpc not found\n"));
414 GNUNET_CONFIGURATION_set_value_string (ah->cfg, "nat", "ENABLE_UPNP",
415 (GNUNET_YES == have_upnpc) ? "YES" : "NO");
421 * Test if ICMP server is working
423 * @param ah auto setup context
426 test_icmp_server (struct GNUNET_NAT_AutoHandle *ah)
433 binary = GNUNET_OS_get_libexec_binary_path ("gnunet-helper-nat-server");
436 GNUNET_CONFIGURATION_get_value_string (ah->cfg, "nat", "EXTERNAL_ADDRESS",
437 &tmp)) && (0 < strlen (tmp)) &&
439 GNUNET_CONFIGURATION_get_value_yesno (ah->cfg, "nat", "BEHIND_NAT")) &&
441 GNUNET_OS_check_helper_binary (binary, GNUNET_YES, "-d 127.0.0.1" ))); // use localhost as source for that one udp-port, ok for testing
442 GNUNET_free_non_null (tmp);
443 GNUNET_free (binary);
444 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
446 ? _("gnunet-helper-nat-server found, testing it\n")
447 : _("No working gnunet-helper-nat-server found\n"));
449 ah->task = GNUNET_SCHEDULER_add_now (&reversal_test, ah);
456 * Test if ICMP client is working
458 * @param ah auto setup context
461 test_icmp_client (struct GNUNET_NAT_AutoHandle *ah)
468 binary = GNUNET_OS_get_libexec_binary_path ("gnunet-helper-nat-client");
471 GNUNET_CONFIGURATION_get_value_string (ah->cfg, "nat", "INTERNAL_ADDRESS",
472 &tmp)) && (0 < strlen (tmp)) &&
474 GNUNET_CONFIGURATION_get_value_yesno (ah->cfg, "nat", "BEHIND_NAT")) &&
476 GNUNET_OS_check_helper_binary (binary, GNUNET_YES, "-d 127.0.0.1 127.0.0.2 42"))); // none of these parameters are actually used in privilege testing mode
477 GNUNET_free_non_null (tmp);
478 GNUNET_free (binary);
479 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
481 ? _("gnunet-helper-nat-client found, enabling it\n")
482 : _("gnunet-helper-nat-client not found or behind NAT, disabling it\n"));
488 * Run the next phase of the auto test.
491 next_phase (struct GNUNET_NAT_AutoHandle *ah)
493 struct GNUNET_CONFIGURATION_Handle *diff;
504 case AUTO_EXTERNAL_IP:
505 test_external_ip (ah);
510 case AUTO_NAT_PUNCHED:
511 test_nat_punched (ah);
516 case AUTO_ICMP_SERVER:
517 test_icmp_server (ah);
519 case AUTO_ICMP_CLIENT:
520 test_icmp_client (ah);
523 diff = GNUNET_CONFIGURATION_get_diff (ah->initial_cfg,
525 ah->fin_cb (ah->fin_cb_cls,
527 GNUNET_NAT_ERROR_SUCCESS);
528 GNUNET_CONFIGURATION_destroy (diff);
529 GNUNET_NAT_autoconfig_cancel (ah);
536 * Start auto-configuration routine. The resolver service should
537 * be available when this function is called.
539 * @param cfg initial configuration
540 * @param cb function to call with autoconfiguration result
541 * @param cb_cls closure for @a cb
542 * @return handle to cancel operation
544 struct GNUNET_NAT_AutoHandle *
545 GNUNET_NAT_autoconfig_start (const struct GNUNET_CONFIGURATION_Handle *cfg,
546 GNUNET_NAT_AutoResultCallback cb,
549 struct GNUNET_NAT_AutoHandle *ah;
551 ah = GNUNET_new (struct GNUNET_NAT_AutoHandle);
553 ah->fin_cb_cls = cb_cls;
554 ah->cfg = GNUNET_CONFIGURATION_dup (cfg);
555 ah->initial_cfg = GNUNET_CONFIGURATION_dup (cfg);
557 /* never use loopback addresses if user wanted autoconfiguration */
558 GNUNET_CONFIGURATION_set_value_string (ah->cfg, "nat",
567 * Abort autoconfiguration.
569 * @param ah handle for operation to abort
572 GNUNET_NAT_autoconfig_cancel (struct GNUNET_NAT_AutoHandle *ah)
576 GNUNET_NAT_test_stop (ah->tst);
581 GNUNET_NAT_mini_get_external_ipv4_cancel (ah->eh);
584 if (GNUNET_SCHEDULER_NO_TASK != ah->task)
586 GNUNET_SCHEDULER_cancel (ah->task);
587 ah->task = GNUNET_SCHEDULER_NO_TASK;
589 GNUNET_CONFIGURATION_destroy (ah->cfg);
590 GNUNET_CONFIGURATION_destroy (ah->initial_cfg);
595 /* end of nat_auto.c */