2 This file is part of GNUnet
3 Copyright (C) 2007, 2009, 2011, 2012 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/>.
18 SPDX-License-Identifier: AGPL3.0-or-later
22 * @file test_gnunet_vpn.c
23 * @brief testcase for tunneling HTTP over the GNUnet VPN
24 * @author Christian Grothoff
27 /* Just included for the right curl.h */
28 #include "gnunet_curl_lib.h"
29 #include <microhttpd.h>
30 #include "gnunet_vpn_service.h"
31 #include "gnunet_testing_lib.h"
35 #define TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 300)
39 * Return value for 'main'.
41 static int global_ret;
43 static struct GNUNET_VPN_Handle *vpn;
45 static struct MHD_Daemon *mhd;
47 static struct GNUNET_SCHEDULER_Task *mhd_task_id;
49 static struct GNUNET_SCHEDULER_Task *curl_task_id;
51 static struct GNUNET_SCHEDULER_Task *timeout_task_id;
53 static struct GNUNET_VPN_RedirectionRequest *rr;
62 * IP address of the ultimate destination.
64 static const char *dest_ip;
67 * Address family of the dest_ip.
72 * Address family to use by the curl client.
83 static struct CBC cbc;
87 copy_buffer (void *ptr, size_t size, size_t nmemb, void *ctx)
89 struct CBC *cbc = ctx;
91 if (cbc->pos + size * nmemb > sizeof (cbc->buf))
92 return 0; /* overflow */
93 GNUNET_memcpy (&cbc->buf[cbc->pos], ptr, size * nmemb);
94 cbc->pos += size * nmemb;
101 struct MHD_Connection *connection,
105 const char *upload_data,
106 size_t * upload_data_size,
110 struct MHD_Response *response;
113 if (0 != strcmp ("GET", method))
114 return MHD_NO; /* unexpected method */
121 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
122 "MHD sends respose for request to URL `%s'\n", url);
124 MHD_create_response_from_buffer (strlen (url), (void *) url,
125 MHD_RESPMEM_MUST_COPY);
126 ret = MHD_queue_response (connection, MHD_HTTP_OK, response);
127 MHD_destroy_response (response);
135 do_shutdown (void *cls)
137 if (NULL != mhd_task_id)
139 GNUNET_SCHEDULER_cancel (mhd_task_id);
142 if (NULL != curl_task_id)
144 GNUNET_SCHEDULER_cancel (curl_task_id);
147 if (NULL != timeout_task_id)
149 GNUNET_SCHEDULER_cancel (timeout_task_id);
150 timeout_task_id = NULL;
154 MHD_stop_daemon (mhd);
159 GNUNET_VPN_cancel_request (rr);
164 GNUNET_VPN_disconnect (vpn);
167 GNUNET_free_non_null (url);
173 * Function to run the HTTP client.
176 curl_main (void *cls)
182 struct GNUNET_NETWORK_FDSet nrs;
183 struct GNUNET_NETWORK_FDSet nws;
184 struct GNUNET_TIME_Relative delay;
194 curl_multi_perform (multi, &running);
197 GNUNET_assert (NULL != (msg = curl_multi_info_read (multi, &running)));
198 if (msg->msg == CURLMSG_DONE)
200 if (msg->data.result != CURLE_OK)
202 fprintf (stderr, "%s failed at %s:%d: `%s'\n", "curl_multi_perform",
203 __FILE__, __LINE__, curl_easy_strerror (msg->data.result));
207 curl_multi_remove_handle (multi, curl);
208 curl_multi_cleanup (multi);
209 curl_easy_cleanup (curl);
212 if (cbc.pos != strlen ("/hello_world"))
217 if (0 != strncmp ("/hello_world", cbc.buf, strlen ("/hello_world")))
220 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
221 "You might want to check if your host-based firewall is blocking the connections.\n");
224 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Download complete, shutting down!\n");
225 GNUNET_SCHEDULER_shutdown ();
228 GNUNET_assert (CURLM_OK == curl_multi_fdset (multi, &rs, &ws, &es, &max));
229 if ((CURLM_OK != curl_multi_timeout (multi, &timeout)) || (-1 == timeout))
230 delay = GNUNET_TIME_UNIT_SECONDS;
233 GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
234 (unsigned int) timeout);
235 GNUNET_NETWORK_fdset_copy_native (&nrs, &rs, max + 1);
236 GNUNET_NETWORK_fdset_copy_native (&nws, &ws, max + 1);
238 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT, delay,
239 &nrs, &nws, &curl_main, NULL);
244 * Callback invoked from the VPN service once a redirection is
245 * available. Provides the IP address that can now be used to
246 * reach the requested destination (in our case, the MHD server)
249 * @param af address family, AF_INET or AF_INET6; AF_UNSPEC on error;
250 * will match 'result_af' from the request
251 * @param address IP address (struct in_addr or struct in_addr6, depending on 'af')
252 * that the VPN allocated for the redirection;
253 * traffic to this IP will now be redirected to the
254 * specified target peer; NULL on error
257 allocation_cb (void *cls, int af, const void *address)
259 char ips[INET6_ADDRSTRLEN];
265 "VPN failed to allocate appropriate address\n");
266 GNUNET_SCHEDULER_shutdown ();
270 GNUNET_asprintf (&url,
271 "http://[%s]:%u/hello_world",
276 (unsigned int) PORT);
278 GNUNET_asprintf (&url,
279 "http://%s:%u/hello_world",
284 (unsigned int) PORT);
285 curl = curl_easy_init ();
286 curl_easy_setopt (curl, CURLOPT_URL, url);
287 curl_easy_setopt (curl, CURLOPT_WRITEFUNCTION, ©_buffer);
288 curl_easy_setopt (curl, CURLOPT_WRITEDATA, &cbc);
289 curl_easy_setopt (curl, CURLOPT_FAILONERROR, 1);
290 curl_easy_setopt (curl, CURLOPT_TIMEOUT, 150L);
291 curl_easy_setopt (curl, CURLOPT_CONNECTTIMEOUT, 15L);
292 curl_easy_setopt (curl, CURLOPT_NOSIGNAL, 1);
293 curl_easy_setopt (curl, CURLOPT_VERBOSE, 0);
295 multi = curl_multi_init ();
296 GNUNET_assert (multi != NULL);
297 GNUNET_assert (CURLM_OK == curl_multi_add_handle (multi, curl));
298 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
299 "Beginning HTTP download from `%s'\n",
301 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_SECONDS,
308 * Function to keep the HTTP server running.
324 do_timeout (void *cls)
326 timeout_task_id = NULL;
327 GNUNET_SCHEDULER_shutdown ();
336 struct GNUNET_NETWORK_FDSet nrs;
337 struct GNUNET_NETWORK_FDSet nws;
342 unsigned MHD_LONG_LONG timeout;
343 struct GNUNET_TIME_Relative delay;
345 GNUNET_assert (NULL == mhd_task_id);
350 GNUNET_assert (MHD_YES == MHD_get_fdset (mhd, &rs, &ws, &es, &max_fd));
351 if (MHD_YES == MHD_get_timeout (mhd, &timeout))
353 GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
354 (unsigned int) timeout);
356 delay = GNUNET_TIME_UNIT_FOREVER_REL;
357 GNUNET_NETWORK_fdset_copy_native (&nrs, &rs, max_fd + 1);
358 GNUNET_NETWORK_fdset_copy_native (&nws, &ws, max_fd + 1);
360 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT, delay,
361 &nrs, &nws, &mhd_task, NULL);
367 const struct GNUNET_CONFIGURATION_Handle *cfg,
368 struct GNUNET_TESTING_Peer *peer)
375 vpn = GNUNET_VPN_connect (cfg);
376 GNUNET_assert (NULL != vpn);
377 flags = MHD_USE_DEBUG;
378 if (AF_INET6 == dest_af)
379 flags |= MHD_USE_IPv6;
381 MHD_start_daemon (flags, PORT, NULL, NULL, &mhd_ahc, NULL,
385 GNUNET_assert (NULL != mhd);
391 GNUNET_assert (1 == inet_pton (dest_af, dest_ip, &v4));
395 GNUNET_assert (1 == inet_pton (dest_af, dest_ip, &v6));
401 rr = GNUNET_VPN_redirect_to_ip (vpn, src_af, dest_af, addr,
402 GNUNET_TIME_UNIT_FOREVER_ABS, &allocation_cb,
405 GNUNET_SCHEDULER_add_delayed (TIMEOUT,
408 GNUNET_SCHEDULER_add_shutdown (&do_shutdown,
414 main (int argc, char *const *argv)
423 if (0 != ACCESS ("/dev/net/tun", R_OK))
425 GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR,
429 "WARNING: System unable to run test, skipping.\n");
433 vpn_binary = GNUNET_OS_get_libexec_binary_path ("gnunet-helper-vpn");
434 exit_binary = GNUNET_OS_get_libexec_binary_path ("gnunet-helper-exit");
435 if ((GNUNET_YES != (ret = GNUNET_OS_check_helper_binary (vpn_binary, GNUNET_YES, "-d gnunet-vpn - - 169.1.3.3.7 255.255.255.0"))) || //ipv4 only please!
436 (GNUNET_YES != (ret = GNUNET_OS_check_helper_binary (exit_binary, GNUNET_YES, "-d gnunet-vpn - - - 169.1.3.3.7 255.255.255.0")))) //no nat, ipv4 only
438 GNUNET_free (vpn_binary);
439 GNUNET_free (exit_binary);
441 "WARNING: gnunet-helper-{exit,vpn} binaries are not SUID, refusing to run test (as it would have to fail). %d\n", ret);
445 GNUNET_free (vpn_binary);
446 GNUNET_free (exit_binary);
448 if (NULL != strstr (bin, "lt-"))
449 bin = strstr (bin, "lt-") + 4;
450 type = strstr (bin, "-");
454 "invalid binary name\n");
458 /* on Windows, .exe is suffixed to these binaries,
459 * thus cease comparison after the 6th char.
461 if (0 == strncmp (type, "4_to_6",6))
463 dest_ip = "FC5A:04E1:C2BA::1";
467 else if (0 == strncmp (type, "6_to_4",6))
469 dest_ip = "169.254.86.1";
473 else if (0 == strncmp (type, "4_over",6))
475 dest_ip = "169.254.86.1";
479 else if (0 == strncmp (type, "6_over",6))
481 dest_ip = "FC5A:04E1:C2BA::1";
487 fprintf (stderr, "invalid binary suffix `%s'\n", type);
490 if ((GNUNET_OK != GNUNET_NETWORK_test_pf (src_af)) ||
491 (GNUNET_OK != GNUNET_NETWORK_test_pf (dest_af)))
494 "Required address families not supported by this system, skipping test.\n");
497 if (0 != curl_global_init (CURL_GLOBAL_WIN32))
499 fprintf (stderr, "failed to initialize curl\n");
503 GNUNET_TESTING_peer_run ("test-gnunet-vpn", "test_gnunet_vpn.conf", &run,
506 GNUNET_DISK_directory_remove ("/tmp/gnunet-test-vpn");
510 /* end of test_gnunet_vpn.c */