diff options
Diffstat (limited to 'src/nat/gnunet-nat.c')
-rw-r--r-- | src/nat/gnunet-nat.c | 476 |
1 files changed, 0 insertions, 476 deletions
diff --git a/src/nat/gnunet-nat.c b/src/nat/gnunet-nat.c deleted file mode 100644 index 0743a478d..000000000 --- a/src/nat/gnunet-nat.c +++ /dev/null | |||
@@ -1,476 +0,0 @@ | |||
1 | /* | ||
2 | This file is part of GNUnet. | ||
3 | Copyright (C) 2015, 2016 GNUnet e.V. | ||
4 | |||
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. | ||
9 | |||
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. | ||
14 | |||
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/>. | ||
17 | |||
18 | SPDX-License-Identifier: AGPL3.0-or-later | ||
19 | */ | ||
20 | |||
21 | /** | ||
22 | * @file src/nat/gnunet-nat.c | ||
23 | * @brief Command-line tool to interact with the NAT service | ||
24 | * @author Christian Grothoff | ||
25 | * @author Bruno Cabral | ||
26 | */ | ||
27 | #include "platform.h" | ||
28 | #include "gnunet_util_lib.h" | ||
29 | #include "gnunet_nat_service.h" | ||
30 | |||
31 | /** | ||
32 | * Value to return from #main(). | ||
33 | */ | ||
34 | static int global_ret; | ||
35 | |||
36 | /** | ||
37 | * Name of section in configuration file to use for | ||
38 | * additional options. | ||
39 | */ | ||
40 | static char *section_name; | ||
41 | |||
42 | /** | ||
43 | * Flag set to 1 if we use IPPROTO_UDP. | ||
44 | */ | ||
45 | static int use_udp; | ||
46 | |||
47 | /** | ||
48 | * Flag set to 1 if we are to listen for connection reversal requests. | ||
49 | */ | ||
50 | static int listen_reversal; | ||
51 | |||
52 | /** | ||
53 | * Flag set to 1 if we use IPPROTO_TCP. | ||
54 | */ | ||
55 | static int use_tcp; | ||
56 | |||
57 | /** | ||
58 | * Protocol to use. | ||
59 | */ | ||
60 | static uint8_t proto; | ||
61 | |||
62 | /** | ||
63 | * Local address to use for connection reversal request. | ||
64 | */ | ||
65 | static char *local_addr; | ||
66 | |||
67 | /** | ||
68 | * Remote address to use for connection reversal request. | ||
69 | */ | ||
70 | static char *remote_addr; | ||
71 | |||
72 | /** | ||
73 | * Should we actually bind to #bind_addr and receive and process STUN requests? | ||
74 | */ | ||
75 | static int do_stun; | ||
76 | |||
77 | /** | ||
78 | * Handle to NAT operation. | ||
79 | */ | ||
80 | static struct GNUNET_NAT_Handle *nh; | ||
81 | |||
82 | /** | ||
83 | * Listen socket for STUN processing. | ||
84 | */ | ||
85 | static struct GNUNET_NETWORK_Handle *ls; | ||
86 | |||
87 | /** | ||
88 | * Task for reading STUN packets. | ||
89 | */ | ||
90 | static struct GNUNET_SCHEDULER_Task *rtask; | ||
91 | |||
92 | |||
93 | /** | ||
94 | * Test if all activities have finished, and if so, | ||
95 | * terminate. | ||
96 | */ | ||
97 | static void | ||
98 | test_finished () | ||
99 | { | ||
100 | if (NULL != nh) | ||
101 | return; | ||
102 | if (NULL != rtask) | ||
103 | return; | ||
104 | GNUNET_SCHEDULER_shutdown (); | ||
105 | } | ||
106 | |||
107 | |||
108 | /** | ||
109 | * Signature of the callback passed to #GNUNET_NAT_register() for | ||
110 | * a function to call whenever our set of 'valid' addresses changes. | ||
111 | * | ||
112 | * @param cls closure, NULL | ||
113 | * @param app_ctx[in,out] location where the app can store stuff | ||
114 | * on add and retrieve it on remove | ||
115 | * @param add_remove #GNUNET_YES to add a new public IP address, | ||
116 | * #GNUNET_NO to remove a previous (now invalid) one | ||
117 | * @param ac address class the address belongs to | ||
118 | * @param addr either the previous or the new public IP address | ||
119 | * @param addrlen actual length of the @a addr | ||
120 | */ | ||
121 | static void | ||
122 | address_cb (void *cls, | ||
123 | void **app_ctx, | ||
124 | int add_remove, | ||
125 | enum GNUNET_NAT_AddressClass ac, | ||
126 | const struct sockaddr *addr, | ||
127 | socklen_t addrlen) | ||
128 | { | ||
129 | (void) cls; | ||
130 | (void) app_ctx; | ||
131 | |||
132 | fprintf (stdout, | ||
133 | "%s %s (%d)\n", | ||
134 | add_remove ? "+" : "-", | ||
135 | GNUNET_a2s (addr, addrlen), | ||
136 | (int) ac); | ||
137 | } | ||
138 | |||
139 | |||
140 | /** | ||
141 | * Signature of the callback passed to #GNUNET_NAT_register(). | ||
142 | * for a function to call whenever someone asks us to do connection | ||
143 | * reversal. | ||
144 | * | ||
145 | * @param cls closure, NULL | ||
146 | * @param remote_addr public IP address of the other peer | ||
147 | * @param remote_addrlen actual length of the @a remote_addr | ||
148 | */ | ||
149 | static void | ||
150 | reversal_cb (void *cls, | ||
151 | const struct sockaddr *remote_addr, | ||
152 | socklen_t remote_addrlen) | ||
153 | { | ||
154 | GNUNET_log (GNUNET_ERROR_TYPE_MESSAGE, | ||
155 | "Connection reversal requested by %s\n", | ||
156 | GNUNET_a2s (remote_addr, remote_addrlen)); | ||
157 | } | ||
158 | |||
159 | |||
160 | /** | ||
161 | * Task run on shutdown. | ||
162 | * | ||
163 | * @param cls NULL | ||
164 | */ | ||
165 | static void | ||
166 | do_shutdown (void *cls) | ||
167 | { | ||
168 | if (NULL != nh) | ||
169 | { | ||
170 | GNUNET_NAT_unregister (nh); | ||
171 | nh = NULL; | ||
172 | } | ||
173 | if (NULL != ls) | ||
174 | { | ||
175 | GNUNET_NETWORK_socket_close (ls); | ||
176 | ls = NULL; | ||
177 | } | ||
178 | if (NULL != rtask) | ||
179 | { | ||
180 | GNUNET_SCHEDULER_cancel (rtask); | ||
181 | rtask = NULL; | ||
182 | } | ||
183 | } | ||
184 | |||
185 | |||
186 | /** | ||
187 | * Task to receive incoming packets for STUN processing. | ||
188 | */ | ||
189 | static void | ||
190 | stun_read_task (void *cls) | ||
191 | { | ||
192 | ssize_t size; | ||
193 | |||
194 | rtask = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL, | ||
195 | ls, | ||
196 | &stun_read_task, | ||
197 | NULL); | ||
198 | size = GNUNET_NETWORK_socket_recvfrom_amount (ls); | ||
199 | if (size > 0) | ||
200 | { | ||
201 | GNUNET_break (0); | ||
202 | GNUNET_SCHEDULER_shutdown (); | ||
203 | global_ret = 1; | ||
204 | return; | ||
205 | } | ||
206 | { | ||
207 | char buf[size + 1]; | ||
208 | struct sockaddr_storage sa; | ||
209 | socklen_t salen = sizeof(sa); | ||
210 | ssize_t ret; | ||
211 | |||
212 | ret = GNUNET_NETWORK_socket_recvfrom (ls, | ||
213 | buf, | ||
214 | size + 1, | ||
215 | (struct sockaddr *) &sa, | ||
216 | &salen); | ||
217 | if (ret != size) | ||
218 | { | ||
219 | GNUNET_break (0); | ||
220 | GNUNET_SCHEDULER_shutdown (); | ||
221 | global_ret = 1; | ||
222 | return; | ||
223 | } | ||
224 | (void) GNUNET_NAT_stun_handle_packet (nh, | ||
225 | (const struct sockaddr *) &sa, | ||
226 | salen, | ||
227 | buf, | ||
228 | ret); | ||
229 | } | ||
230 | } | ||
231 | |||
232 | |||
233 | /** | ||
234 | * Main function that will be run. | ||
235 | * | ||
236 | * @param cls closure | ||
237 | * @param args remaining command-line arguments | ||
238 | * @param cfgfile name of the configuration file used (for saving, can be NULL!) | ||
239 | * @param c configuration | ||
240 | */ | ||
241 | static void | ||
242 | run (void *cls, | ||
243 | char *const *args, | ||
244 | const char *cfgfile, | ||
245 | const struct GNUNET_CONFIGURATION_Handle *c) | ||
246 | { | ||
247 | uint8_t af; | ||
248 | struct sockaddr *local_sa; | ||
249 | struct sockaddr *remote_sa; | ||
250 | socklen_t local_len; | ||
251 | size_t remote_len; | ||
252 | |||
253 | if (use_tcp && use_udp) | ||
254 | { | ||
255 | GNUNET_log (GNUNET_ERROR_TYPE_MESSAGE, "Cannot use TCP and UDP\n"); | ||
256 | global_ret = 1; | ||
257 | return; | ||
258 | } | ||
259 | proto = 0; | ||
260 | if (use_tcp) | ||
261 | proto = IPPROTO_TCP; | ||
262 | if (use_udp) | ||
263 | proto = IPPROTO_UDP; | ||
264 | |||
265 | GNUNET_SCHEDULER_add_shutdown (&do_shutdown, NULL); | ||
266 | |||
267 | if (0 == proto) | ||
268 | { | ||
269 | GNUNET_log (GNUNET_ERROR_TYPE_MESSAGE, "Must specify either TCP or UDP\n"); | ||
270 | global_ret = 1; | ||
271 | return; | ||
272 | } | ||
273 | local_len = 0; | ||
274 | local_sa = NULL; | ||
275 | remote_len = 0; | ||
276 | remote_sa = NULL; | ||
277 | if (NULL != local_addr) | ||
278 | { | ||
279 | local_len = | ||
280 | (socklen_t) GNUNET_STRINGS_parse_socket_addr (local_addr, &af, &local_sa); | ||
281 | if (0 == local_len) | ||
282 | { | ||
283 | GNUNET_log (GNUNET_ERROR_TYPE_MESSAGE, | ||
284 | "Invalid socket address `%s'\n", | ||
285 | local_addr); | ||
286 | goto fail_and_shutdown; | ||
287 | } | ||
288 | } | ||
289 | |||
290 | if (NULL != remote_addr) | ||
291 | { | ||
292 | remote_len = | ||
293 | GNUNET_STRINGS_parse_socket_addr (remote_addr, &af, &remote_sa); | ||
294 | if (0 == remote_len) | ||
295 | { | ||
296 | GNUNET_log (GNUNET_ERROR_TYPE_MESSAGE, | ||
297 | "Invalid socket address `%s'\n", | ||
298 | remote_addr); | ||
299 | goto fail_and_shutdown; | ||
300 | } | ||
301 | } | ||
302 | |||
303 | if (NULL != local_addr) | ||
304 | { | ||
305 | if (NULL == section_name) | ||
306 | section_name = GNUNET_strdup ("undefined"); | ||
307 | nh = GNUNET_NAT_register (c, | ||
308 | section_name, | ||
309 | proto, | ||
310 | 1, | ||
311 | (const struct sockaddr **) &local_sa, | ||
312 | &local_len, | ||
313 | &address_cb, | ||
314 | (listen_reversal) ? &reversal_cb : NULL, | ||
315 | NULL); | ||
316 | } | ||
317 | else if (listen_reversal) | ||
318 | { | ||
319 | GNUNET_log (GNUNET_ERROR_TYPE_MESSAGE, | ||
320 | "Use of `-W` only effective in combination with `-i`\n"); | ||
321 | goto fail_and_shutdown; | ||
322 | } | ||
323 | |||
324 | if (NULL != remote_addr) | ||
325 | { | ||
326 | int ret; | ||
327 | |||
328 | if ((NULL == nh) || (sizeof(struct sockaddr_in) != local_len)) | ||
329 | { | ||
330 | GNUNET_log (GNUNET_ERROR_TYPE_MESSAGE, | ||
331 | "Require IPv4 local address to initiate connection reversal\n"); | ||
332 | goto fail_and_shutdown; | ||
333 | } | ||
334 | if (sizeof(struct sockaddr_in) != remote_len) | ||
335 | { | ||
336 | GNUNET_log (GNUNET_ERROR_TYPE_MESSAGE, | ||
337 | "Require IPv4 reversal target address\n"); | ||
338 | goto fail_and_shutdown; | ||
339 | } | ||
340 | GNUNET_assert (AF_INET == local_sa->sa_family); | ||
341 | GNUNET_assert (AF_INET == remote_sa->sa_family); | ||
342 | ret = GNUNET_NAT_request_reversal (nh, | ||
343 | (const struct sockaddr_in *) local_sa, | ||
344 | (const struct sockaddr_in *) remote_sa); | ||
345 | switch (ret) | ||
346 | { | ||
347 | case GNUNET_SYSERR: | ||
348 | GNUNET_log (GNUNET_ERROR_TYPE_MESSAGE, | ||
349 | "Connection reversal internal error\n"); | ||
350 | break; | ||
351 | |||
352 | case GNUNET_NO: | ||
353 | GNUNET_log (GNUNET_ERROR_TYPE_MESSAGE, | ||
354 | "Connection reversal unavailable\n"); | ||
355 | break; | ||
356 | |||
357 | case GNUNET_OK: | ||
358 | /* operation in progress */ | ||
359 | break; | ||
360 | } | ||
361 | } | ||
362 | |||
363 | if (do_stun) | ||
364 | { | ||
365 | if (NULL == local_addr) | ||
366 | { | ||
367 | GNUNET_log (GNUNET_ERROR_TYPE_MESSAGE, | ||
368 | "Require local address to support STUN requests\n"); | ||
369 | goto fail_and_shutdown; | ||
370 | } | ||
371 | if (IPPROTO_UDP != proto) | ||
372 | { | ||
373 | GNUNET_log (GNUNET_ERROR_TYPE_MESSAGE, "STUN only supported over UDP\n"); | ||
374 | goto fail_and_shutdown; | ||
375 | } | ||
376 | ls = GNUNET_NETWORK_socket_create (af, SOCK_DGRAM, IPPROTO_UDP); | ||
377 | if (NULL == ls) | ||
378 | { | ||
379 | GNUNET_log (GNUNET_ERROR_TYPE_MESSAGE, "Failed to create socket\n"); | ||
380 | goto fail_and_shutdown; | ||
381 | } | ||
382 | if (GNUNET_OK != GNUNET_NETWORK_socket_bind (ls, local_sa, local_len)) | ||
383 | { | ||
384 | GNUNET_log (GNUNET_ERROR_TYPE_ERROR, | ||
385 | "Failed to bind to %s: %s\n", | ||
386 | GNUNET_a2s (local_sa, local_len), | ||
387 | strerror (errno)); | ||
388 | goto fail_and_shutdown; | ||
389 | } | ||
390 | rtask = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL, | ||
391 | ls, | ||
392 | &stun_read_task, | ||
393 | NULL); | ||
394 | } | ||
395 | GNUNET_free (remote_sa); | ||
396 | GNUNET_free (local_sa); | ||
397 | test_finished (); | ||
398 | return; | ||
399 | fail_and_shutdown: | ||
400 | global_ret = 1; | ||
401 | GNUNET_SCHEDULER_shutdown (); | ||
402 | GNUNET_free (remote_sa); | ||
403 | GNUNET_free (local_sa); | ||
404 | } | ||
405 | |||
406 | |||
407 | /** | ||
408 | * Main function of gnunet-nat | ||
409 | * | ||
410 | * @param argc number of command-line arguments | ||
411 | * @param argv command line | ||
412 | * @return 0 on success, -1 on error | ||
413 | */ | ||
414 | int | ||
415 | main (int argc, char *const argv[]) | ||
416 | { | ||
417 | struct GNUNET_GETOPT_CommandLineOption options[] = { | ||
418 | GNUNET_GETOPT_option_string ( | ||
419 | 'i', | ||
420 | "in", | ||
421 | "ADDRESS", | ||
422 | gettext_noop ("which IP and port are we locally using to bind/listen to"), | ||
423 | &local_addr), | ||
424 | |||
425 | GNUNET_GETOPT_option_string ( | ||
426 | 'r', | ||
427 | "remote", | ||
428 | "ADDRESS", | ||
429 | gettext_noop ( | ||
430 | "which remote IP and port should be asked for connection reversal"), | ||
431 | &remote_addr), | ||
432 | |||
433 | GNUNET_GETOPT_option_string ( | ||
434 | 'S', | ||
435 | "section", | ||
436 | NULL, | ||
437 | gettext_noop ( | ||
438 | "name of configuration section to find additional options, such as manual host punching data"), | ||
439 | §ion_name), | ||
440 | |||
441 | GNUNET_GETOPT_option_flag ('s', | ||
442 | "stun", | ||
443 | gettext_noop ("enable STUN processing"), | ||
444 | &do_stun), | ||
445 | |||
446 | GNUNET_GETOPT_option_flag ('t', "tcp", gettext_noop ("use TCP"), &use_tcp), | ||
447 | |||
448 | GNUNET_GETOPT_option_flag ('u', "udp", gettext_noop ("use UDP"), &use_udp), | ||
449 | |||
450 | GNUNET_GETOPT_option_flag ('W', | ||
451 | "watch", | ||
452 | gettext_noop ( | ||
453 | "watch for connection reversal requests"), | ||
454 | &listen_reversal), | ||
455 | GNUNET_GETOPT_OPTION_END | ||
456 | }; | ||
457 | |||
458 | if (GNUNET_OK != GNUNET_STRINGS_get_utf8_args (argc, argv, &argc, &argv)) | ||
459 | return 2; | ||
460 | if (GNUNET_OK != | ||
461 | GNUNET_PROGRAM_run (argc, | ||
462 | argv, | ||
463 | "gnunet-nat [options]", | ||
464 | _ ("GNUnet NAT traversal autoconfigure daemon"), | ||
465 | options, | ||
466 | &run, | ||
467 | NULL)) | ||
468 | { | ||
469 | global_ret = 1; | ||
470 | } | ||
471 | GNUNET_free_nz ((void *) argv); | ||
472 | return global_ret; | ||
473 | } | ||
474 | |||
475 | |||
476 | /* end of gnunet-nat.c */ | ||