2 This file is part of GNUnet
3 Copyright (C) 2007, 2009, 2011, 2012, 2015, 2017 Christian Grothoff
5 GNUnet is free software: you can redistribute it and/or modify it
6 under the terms of the GNU Affero General Public License as published
7 by the Free Software Foundation, either version 3 of the License,
8 or (at your option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Affero General Public License for more details.
15 You should have received a copy of the GNU Affero General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>.
20 * @file test_gns_vpn.c
21 * @brief testcase for accessing VPN services via GNS
22 * @author Martin Schanzenbach
23 * @author Christian Grothoff
25 * This test requires libcurl/libgnurl *with* support for C-ARES.
26 * This is NOT the default on most platforms, which means the test
27 * will be skipped in many cases. Compile libcurl/libgnurl with
28 * "--enable-ares" to get this test to pass.
30 * Furthermore, the test relies on gnunet-dns2gns being able to bind
31 * to port 53. This means that 'setcap' has to have worked during
32 * 'make install'. If this failed, but everything else is OK, the
33 * test may FAIL hard even though it is just an installation issue (we
34 * cannot conveniently test for the setcap to have worked). However,
35 * you should get a warning that gnunet-dns2gns failed to 'bind'.
39 #include <curl/curl.h>
40 #elif HAVE_GNURL_CURL_H
41 #include <gnurl/curl.h>
43 #include <microhttpd.h>
44 #include "gnunet_identity_service.h"
45 #include "gnunet_namestore_service.h"
46 #include "gnunet_gnsrecord_lib.h"
47 #include "gnunet_gns_service.h"
48 #include "gnunet_testing_lib.h"
51 #define TEST_DOMAIN "www.gnu"
53 #define TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 30)
56 * Return value for #main().
58 static int global_ret;
60 static struct GNUNET_NAMESTORE_Handle *namestore;
62 static struct MHD_Daemon *mhd;
64 static struct GNUNET_SCHEDULER_Task *mhd_task_id;
66 static struct GNUNET_SCHEDULER_Task *curl_task_id;
68 static struct GNUNET_SCHEDULER_Task *timeout_task;
70 static struct GNUNET_IDENTITY_Handle *identity;
72 static struct GNUNET_NAMESTORE_QueueEntry *qe;
80 static struct GNUNET_PeerIdentity id;
83 * IP address of the ultimate destination.
85 static const char *dest_ip;
88 * Address family of the dest_ip.
93 * Address family to use by the curl client.
106 static struct CBC cbc;
110 copy_buffer (void *ptr,
115 struct CBC *cbc = ctx;
117 if (cbc->pos + size * nmemb > sizeof(cbc->buf))
118 return 0; /* overflow */
119 GNUNET_memcpy (&cbc->buf[cbc->pos], ptr, size * nmemb);
120 cbc->pos += size * nmemb;
127 struct MHD_Connection *connection,
131 const char *upload_data, size_t *upload_data_size,
135 struct MHD_Response *response;
138 if (0 != strcmp ("GET", method))
139 return MHD_NO; /* unexpected method */
146 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MHD sends respose for request to URL `%s'\n", url);
147 response = MHD_create_response_from_buffer (strlen (url),
149 MHD_RESPMEM_MUST_COPY);
150 ret = MHD_queue_response (connection, MHD_HTTP_OK, response);
151 MHD_destroy_response (response);
159 do_shutdown (void *cls)
161 if (NULL != mhd_task_id)
163 GNUNET_SCHEDULER_cancel (mhd_task_id);
166 if (NULL != curl_task_id)
168 GNUNET_SCHEDULER_cancel (curl_task_id);
171 if (NULL != timeout_task)
173 GNUNET_SCHEDULER_cancel (timeout_task);
178 MHD_stop_daemon (mhd);
181 if (NULL != identity)
183 GNUNET_IDENTITY_disconnect (identity);
188 GNUNET_NAMESTORE_cancel (qe);
191 if (NULL != namestore)
193 GNUNET_NAMESTORE_disconnect (namestore);
196 GNUNET_free_non_null (url);
202 do_timeout (void *cls)
205 GNUNET_SCHEDULER_shutdown ();
210 * Function to run the HTTP client.
217 curl_task (void *cls)
231 struct GNUNET_NETWORK_FDSet nrs;
232 struct GNUNET_NETWORK_FDSet nws;
233 struct GNUNET_TIME_Relative delay;
242 curl_multi_perform (multi, &running);
245 GNUNET_assert (NULL != (msg = curl_multi_info_read (multi, &running)));
246 if (msg->msg == CURLMSG_DONE)
248 if (msg->data.result != CURLE_OK)
251 "%s failed at %s:%d: `%s'\n",
252 "curl_multi_perform",
254 __LINE__, curl_easy_strerror (msg->data.result));
258 curl_multi_remove_handle (multi, curl);
259 curl_multi_cleanup (multi);
260 curl_easy_cleanup (curl);
263 if (cbc.pos != strlen ("/hello_world"))
268 if (0 != strncmp ("/hello_world", cbc.buf, strlen ("/hello_world")))
273 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
274 "Download complete, shutting down!\n");
275 GNUNET_SCHEDULER_shutdown ();
278 GNUNET_assert (CURLM_OK == curl_multi_fdset (multi, &rs, &ws, &es, &max));
279 if ( (CURLM_OK != curl_multi_timeout (multi, &timeout)) ||
281 delay = GNUNET_TIME_UNIT_SECONDS;
283 delay = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS, (unsigned int) timeout);
284 GNUNET_NETWORK_fdset_copy_native (&nrs,
287 GNUNET_NETWORK_fdset_copy_native (&nws,
290 curl_task_id = GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
300 start_curl (void *cls)
305 GNUNET_asprintf (&url,
306 "http://%s/hello_world",
308 curl = curl_easy_init ();
309 curl_easy_setopt (curl, CURLOPT_URL, url);
310 curl_easy_setopt (curl, CURLOPT_WRITEFUNCTION, ©_buffer);
311 curl_easy_setopt (curl, CURLOPT_WRITEDATA, &cbc);
312 curl_easy_setopt (curl, CURLOPT_FAILONERROR, 1);
313 curl_easy_setopt (curl, CURLOPT_TIMEOUT, 150L);
314 curl_easy_setopt (curl, CURLOPT_CONNECTTIMEOUT, 150L);
315 curl_easy_setopt (curl, CURLOPT_NOSIGNAL, 1);
317 (ec = curl_easy_setopt (curl,
321 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
322 "curl build without support for CURLOPT_DNS_SERVERS (%s), cannot run test\n",
323 curl_easy_strerror (ec));
325 GNUNET_SCHEDULER_shutdown ();
328 multi = curl_multi_init ();
329 GNUNET_assert (multi != NULL);
330 GNUNET_assert (CURLM_OK == curl_multi_add_handle (multi, curl));
331 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
332 "Beginning HTTP download from `%s'\n",
339 * Callback invoked from the namestore service once record is
343 * @param af address family, AF_INET or AF_INET6; AF_UNSPEC on error;
344 * will match 'result_af' from the request
345 * @param address IP address (struct in_addr or struct in_addr6, depending on 'af')
346 * that the VPN allocated for the redirection;
347 * traffic to this IP will now be redirected to the
348 * specified target peer; NULL on error
351 commence_testing (void *cls,
356 if ( (NULL != emsg) &&
357 (GNUNET_YES != success) )
360 "NS failed to create record %s\n",
362 GNUNET_SCHEDULER_shutdown ();
366 /* wait a little bit before downloading, as we just created the record */
367 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
368 "Launching cURL request\n");
370 = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_SECONDS,
377 * Function to keep the HTTP server running.
395 struct GNUNET_NETWORK_FDSet nrs;
396 struct GNUNET_NETWORK_FDSet nws;
401 unsigned MHD_LONG_LONG timeout;
402 struct GNUNET_TIME_Relative delay;
404 GNUNET_assert (NULL == mhd_task_id);
409 GNUNET_assert (MHD_YES ==
410 MHD_get_fdset (mhd, &rs, &ws, &es, &max_fd));
411 if (MHD_YES == MHD_get_timeout (mhd, &timeout))
412 delay = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
413 (unsigned int) timeout);
415 delay = GNUNET_TIME_UNIT_FOREVER_REL;
416 GNUNET_NETWORK_fdset_copy_native (&nrs,
419 GNUNET_NETWORK_fdset_copy_native (&nws,
422 mhd_task_id = GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
433 * Open '/dev/null' and make the result the given
436 * @param target_fd desired FD to point to /dev/null
437 * @param flags open flags (O_RDONLY, O_WRONLY)
440 open_dev_null (int target_fd,
445 fd = open ("/dev/null", flags);
450 if (-1 == dup2 (fd, target_fd))
460 * Run the given command and wait for it to complete.
462 * @param file name of the binary to run
463 * @param cmd command line arguments (as given to 'execv')
464 * @return 0 on success, 1 on any error
467 fork_and_exec (const char *file,
477 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR,
483 /* we are the child process */
484 /* close stdin/stdout to not cause interference
485 with the helper's main protocol! */
487 open_dev_null (0, O_RDONLY);
489 open_dev_null (1, O_WRONLY);
490 (void) execv (file, cmd);
491 /* can only get here on error */
492 GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR,
497 /* keep running waitpid as long as the only error we get is 'EINTR' */
498 while ( (-1 == (ret = waitpid (pid, &status, 0))) &&
502 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR,
506 if (! (WIFEXITED (status) &&
507 (0 == WEXITSTATUS (status))) )
509 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
510 "Process `%s` returned status code %d/%d.\n",
513 WEXITSTATUS (status));
516 /* child process completed and returned success, we're happy */
523 * Method called to inform about the egos of this peer.
525 * When used with #GNUNET_IDENTITY_connect, this function is
526 * initially called for all egos and then again whenever a
527 * ego's name changes or if it is deleted. At the end of
528 * the initial pass over all egos, the function is once called
529 * with 'NULL' for @a ego. That does NOT mean that the callback won't
530 * be invoked in the future or that there was an error.
532 * When used with #GNUNET_IDENTITY_create or #GNUNET_IDENTITY_get,
533 * this function is only called ONCE, and 'NULL' being passed in
534 * @a ego does indicate an error (i.e. name is taken or no default
535 * value is known). If @a ego is non-NULL and if '*ctx'
536 * is set in those callbacks, the value WILL be passed to a subsequent
537 * call to the identity callback of #GNUNET_IDENTITY_connect (if
538 * that one was not NULL).
540 * When an identity is renamed, this function is called with the
541 * (known) @a ego but the NEW @a name.
543 * When an identity is deleted, this function is called with the
544 * (known) ego and "NULL" for the @a name. In this case,
545 * the @a ego is henceforth invalid (and the @a ctx should also be
549 * @param ego ego handle
550 * @param ctx context for application to store data for this ego
551 * (during the lifetime of this process, initially NULL)
552 * @param name name assigned by the user for this ego,
553 * NULL if the user just deleted the ego and it
554 * must thus no longer be used
557 identity_cb (void *cls,
558 struct GNUNET_IDENTITY_Ego *ego,
562 const struct GNUNET_CRYPTO_EcdsaPrivateKey *zone_key;
563 struct GNUNET_GNSRECORD_Data rd;
574 "Failed to find master-zone ego\n");
575 GNUNET_SCHEDULER_shutdown ();
578 GNUNET_IDENTITY_disconnect (identity);
582 GNUNET_assert (NULL != name);
583 if (0 != strcmp (name,
587 "Unexpected name %s\n",
591 zone_key = GNUNET_IDENTITY_ego_get_private_key (ego);
592 rd.expiration_time = GNUNET_TIME_UNIT_FOREVER_ABS.abs_value_us;
593 peername = GNUNET_strdup (GNUNET_i2s_full (&id));
594 GNUNET_asprintf (&rd_string,
598 GNUNET_free (peername);
599 GNUNET_assert (GNUNET_OK ==
600 GNUNET_GNSRECORD_string_to_value (GNUNET_GNSRECORD_TYPE_VPN,
604 rd.record_type = GNUNET_GNSRECORD_TYPE_VPN;
606 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
607 "Creating `www` record\n");
608 qe = GNUNET_NAMESTORE_records_store (namestore,
614 GNUNET_free ((void**)rd.data);
615 GNUNET_free (rd_string);
621 const struct GNUNET_CONFIGURATION_Handle *cfg,
622 struct GNUNET_TESTING_Peer *peer)
632 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
633 "Test logic starting...\n");
635 GNUNET_CONFIGURATION_get_value_string (cfg,
640 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
641 "Failed to locate configuration file. Skipping test.\n");
642 GNUNET_SCHEDULER_shutdown ();
646 char *const identity_args[] =
653 char *const identity2_args[] =
661 char *const identity3_args[] =
669 char *const arm_args[] =
676 char *const gns_args[] =
684 GNUNET_TESTING_peer_get_identity (peer,
686 GNUNET_SCHEDULER_add_shutdown (&do_shutdown,
688 timeout_task = GNUNET_SCHEDULER_add_delayed (TIMEOUT,
691 bin = GNUNET_OS_installation_get_path (GNUNET_OS_IPK_BINDIR);
692 GNUNET_asprintf (&bin_identity,
696 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
697 "Creating `master-zone` ego\n");
698 if (0 != fork_and_exec (bin_identity, identity_args))
700 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
701 "Failed to run `gnunet-identity -C`. Skipping test.\n");
702 GNUNET_SCHEDULER_shutdown ();
703 GNUNET_free (bin_identity);
704 GNUNET_free (config);
708 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
709 "Setting `master-zone` ego as default for `gns-master` and `dns2gns`\n");
710 if (0 != fork_and_exec (bin_identity, identity2_args))
712 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
713 "Failed to run `gnunet-identity -e`. Skipping test.\n");
714 GNUNET_SCHEDULER_shutdown ();
715 GNUNET_free (bin_identity);
716 GNUNET_free (config);
720 if (0 != fork_and_exec (bin_identity, identity3_args))
722 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
723 "Failed to run `gnunet-identity -e`. Skipping test.\n");
724 GNUNET_SCHEDULER_shutdown ();
725 GNUNET_free (bin_identity);
726 GNUNET_free (config);
730 GNUNET_free (bin_identity);
732 /* do lookup just to launch GNS service */
733 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
734 "Resolving `www.gnu` zone entry to launch GNS (will yield no answer yet)\n");
735 GNUNET_asprintf (&bin_gns,
739 if (0 != fork_and_exec (bin_gns,
742 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
743 "Failed to run `gnunet-gns -u. Skipping test.\n");
744 GNUNET_SCHEDULER_shutdown ();
745 GNUNET_free (bin_gns);
746 GNUNET_free (config);
750 GNUNET_free (bin_gns);
752 GNUNET_asprintf (&bin_arm,
756 if (0 != fork_and_exec (bin_arm,
759 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
760 "Failed to run `gnunet-arm -i dns2gns. Skipping test.\n");
761 GNUNET_SCHEDULER_shutdown ();
762 GNUNET_free (bin_arm);
763 GNUNET_free (config);
767 GNUNET_free (bin_arm);
769 GNUNET_free (config);
771 sleep (1); /* give dns2gns chance to really run */
773 namestore = GNUNET_NAMESTORE_connect (cfg);
774 GNUNET_assert (NULL != namestore);
775 flags = MHD_USE_DEBUG;
776 if (GNUNET_YES == use_v6)
777 flags |= MHD_USE_DUAL_STACK;
778 mhd = MHD_start_daemon (flags,
783 GNUNET_assert (NULL != mhd);
786 identity = GNUNET_IDENTITY_connect (cfg,
799 GNUNET_log_setup ("test-gns-vpn",
802 if (0 != ACCESS ("/dev/net/tun", R_OK))
804 GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR,
808 "WARNING: System unable to run test, skipping.\n");
812 bin_vpn = GNUNET_OS_get_libexec_binary_path ("gnunet-helper-vpn");
813 bin_exit = GNUNET_OS_get_libexec_binary_path ("gnunet-helper-exit");
814 if ( (0 != geteuid ()) &&
816 GNUNET_OS_check_helper_binary (bin_vpn,
818 "-d gnunet-vpn - - 169.1.3.3.7 255.255.255.0")) || //ipv4 only please!
820 GNUNET_OS_check_helper_binary (bin_exit,
822 "-d gnunet-vpn - - - 169.1.3.3.7 255.255.255.0")) ) ) //no nat, ipv4 only
825 "WARNING: gnunet-helper-{exit,vpn} binaries in $PATH are not SUID, refusing to run test (as it would have to fail).\n");
827 "Change $PATH ('.' in $PATH before $GNUNET_PREFIX/bin is problematic) or permissions (run 'make install' as root) to fix this!\n");
828 GNUNET_free (bin_vpn);
829 GNUNET_free (bin_exit);
832 GNUNET_free (bin_vpn);
833 GNUNET_free (bin_exit);
835 dest_ip = "169.254.86.1";
839 if (GNUNET_OK == GNUNET_NETWORK_test_pf (PF_INET6))
844 if ( (GNUNET_OK != GNUNET_NETWORK_test_pf (src_af)) ||
845 (GNUNET_OK != GNUNET_NETWORK_test_pf (dest_af)) )
848 "Required address families not supported by this system, skipping test.\n");
851 if (0 != curl_global_init (CURL_GLOBAL_WIN32))
853 fprintf (stderr, "failed to initialize curl\n");
859 GNUNET_TESTING_peer_run ("test_gns_vpn",
864 GNUNET_DISK_directory_remove ("/tmp/gnunet-test-vpn");
868 /* end of test_gns_vpn.c */