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Diffstat (limited to 'src/lib/util/regex.c')
-rw-r--r-- | src/lib/util/regex.c | 804 |
1 files changed, 804 insertions, 0 deletions
diff --git a/src/lib/util/regex.c b/src/lib/util/regex.c new file mode 100644 index 000000000..282d3aa99 --- /dev/null +++ b/src/lib/util/regex.c | |||
@@ -0,0 +1,804 @@ | |||
1 | /* | ||
2 | This file is part of GNUnet | ||
3 | Copyright (C) 2012, 2013, 2015 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 | * @file src/tun/regex.c | ||
22 | * @brief functions to convert IP networks to regexes | ||
23 | * @author Maximilian Szengel | ||
24 | * @author Christian Grothoff | ||
25 | */ | ||
26 | |||
27 | #include "platform.h" | ||
28 | #include "gnunet_util_lib.h" | ||
29 | |||
30 | /** | ||
31 | * 'wildcard', matches all possible values (for HEX encoding). | ||
32 | */ | ||
33 | #define DOT "(0|1|2|3|4|5|6|7|8|9|A|B|C|D|E|F)" | ||
34 | |||
35 | |||
36 | void | ||
37 | GNUNET_TUN_ipv4toregexsearch (const struct in_addr *ip, | ||
38 | uint16_t port, | ||
39 | char *rxstr) | ||
40 | { | ||
41 | GNUNET_snprintf (rxstr, | ||
42 | GNUNET_TUN_IPV4_REGEXLEN, | ||
43 | "4-%04X-%08X", | ||
44 | (unsigned int) port, | ||
45 | ntohl (ip->s_addr)); | ||
46 | } | ||
47 | |||
48 | |||
49 | void | ||
50 | GNUNET_TUN_ipv6toregexsearch (const struct in6_addr *ipv6, | ||
51 | uint16_t port, | ||
52 | char *rxstr) | ||
53 | { | ||
54 | const uint32_t *addr; | ||
55 | |||
56 | addr = (const uint32_t *) ipv6; | ||
57 | GNUNET_snprintf (rxstr, | ||
58 | GNUNET_TUN_IPV6_REGEXLEN, | ||
59 | "6-%04X-%08X%08X%08X%08X", | ||
60 | (unsigned int) port, | ||
61 | ntohl (addr[0]), | ||
62 | ntohl (addr[1]), | ||
63 | ntohl (addr[2]), | ||
64 | ntohl (addr[3])); | ||
65 | } | ||
66 | |||
67 | |||
68 | /** | ||
69 | * Convert the given 4-bit (!) number to a regex. | ||
70 | * | ||
71 | * @param value the value, only the lowest 4 bits will be looked at | ||
72 | * @param mask which bits in value are wildcards (any value)? | ||
73 | */ | ||
74 | static char * | ||
75 | nibble_to_regex (uint8_t value, | ||
76 | uint8_t mask) | ||
77 | { | ||
78 | char *ret; | ||
79 | |||
80 | value &= mask; | ||
81 | switch (mask) | ||
82 | { | ||
83 | case 0: | ||
84 | return GNUNET_strdup (DOT); | ||
85 | |||
86 | case 8: | ||
87 | GNUNET_asprintf (&ret, | ||
88 | "(%X|%X|%X|%X|%X|%X|%X|%X)", | ||
89 | value, | ||
90 | value + 1, | ||
91 | value + 2, | ||
92 | value + 3, | ||
93 | value + 4, | ||
94 | value + 5, | ||
95 | value + 6, | ||
96 | value + 7); | ||
97 | return ret; | ||
98 | |||
99 | case 12: | ||
100 | GNUNET_asprintf (&ret, | ||
101 | "(%X|%X|%X|%X)", | ||
102 | value, | ||
103 | value + 1, | ||
104 | value + 2, | ||
105 | value + 3); | ||
106 | return ret; | ||
107 | |||
108 | case 14: | ||
109 | GNUNET_asprintf (&ret, | ||
110 | "(%X|%X)", | ||
111 | value, | ||
112 | value + 1); | ||
113 | return ret; | ||
114 | |||
115 | case 15: | ||
116 | GNUNET_asprintf (&ret, | ||
117 | "%X", | ||
118 | value); | ||
119 | return ret; | ||
120 | |||
121 | default: | ||
122 | GNUNET_log (GNUNET_ERROR_TYPE_WARNING, | ||
123 | _ ("Bad mask: %d\n"), | ||
124 | mask); | ||
125 | GNUNET_break (0); | ||
126 | return NULL; | ||
127 | } | ||
128 | } | ||
129 | |||
130 | |||
131 | /** | ||
132 | * Convert the given 16-bit number to a regex. | ||
133 | * | ||
134 | * @param value the value | ||
135 | * @param mask which bits in value are wildcards (any value)? | ||
136 | */ | ||
137 | static char * | ||
138 | num_to_regex (uint16_t value, | ||
139 | uint16_t mask) | ||
140 | { | ||
141 | const uint8_t *v = (const uint8_t *) &value; | ||
142 | const uint8_t *m = (const uint8_t *) &mask; | ||
143 | char *a; | ||
144 | char *b; | ||
145 | char *c; | ||
146 | char *d; | ||
147 | char *ret; | ||
148 | |||
149 | a = nibble_to_regex (v[0] >> 4, m[0] >> 4); | ||
150 | b = nibble_to_regex (v[0] & 15, m[0] & 15); | ||
151 | c = nibble_to_regex (v[1] >> 4, m[1] >> 4); | ||
152 | d = nibble_to_regex (v[1] & 15, m[1] & 15); | ||
153 | ret = NULL; | ||
154 | if ((NULL != a) && | ||
155 | (NULL != b) && | ||
156 | (NULL != c) && | ||
157 | (NULL != d)) | ||
158 | GNUNET_asprintf (&ret, | ||
159 | "%s%s%s%s", | ||
160 | a, b, c, d); | ||
161 | GNUNET_free (a); | ||
162 | GNUNET_free (b); | ||
163 | GNUNET_free (c); | ||
164 | GNUNET_free (d); | ||
165 | return ret; | ||
166 | } | ||
167 | |||
168 | |||
169 | /** | ||
170 | * Do we need to put parents around the given argument? | ||
171 | * | ||
172 | * @param arg part of a regular expression | ||
173 | * @return #GNUNET_YES if we should parens, | ||
174 | * #GNUNET_NO if not | ||
175 | */ | ||
176 | static int | ||
177 | needs_parens (const char *arg) | ||
178 | { | ||
179 | size_t off; | ||
180 | size_t len; | ||
181 | unsigned int op; | ||
182 | |||
183 | op = 0; | ||
184 | len = strlen (arg); | ||
185 | for (off = 0; off < len; off++) | ||
186 | { | ||
187 | switch (arg[off]) | ||
188 | { | ||
189 | case '(': | ||
190 | op++; | ||
191 | break; | ||
192 | |||
193 | case ')': | ||
194 | GNUNET_assert (op > 0); | ||
195 | op--; | ||
196 | break; | ||
197 | |||
198 | case '|': | ||
199 | if (0 == op) | ||
200 | return GNUNET_YES; | ||
201 | break; | ||
202 | |||
203 | default: | ||
204 | break; | ||
205 | } | ||
206 | } | ||
207 | return GNUNET_NO; | ||
208 | } | ||
209 | |||
210 | |||
211 | /** | ||
212 | * Compute port policy for the given range of | ||
213 | * port numbers. | ||
214 | * | ||
215 | * @param start starting offset | ||
216 | * @param end end offset | ||
217 | * @param step increment level (power of 16) | ||
218 | * @param pp port policy to convert | ||
219 | * @return corresponding regex | ||
220 | */ | ||
221 | static char * | ||
222 | compute_policy (unsigned int start, | ||
223 | unsigned int end, | ||
224 | unsigned int step, | ||
225 | const struct GNUNET_STRINGS_PortPolicy *pp) | ||
226 | { | ||
227 | unsigned int i; | ||
228 | char before[36]; /* 16 * 2 + 3 dots + 0-terminator */ | ||
229 | char middlel[33]; /* 16 * 2 + 0-terminator */ | ||
230 | char middleh[33]; /* 16 * 2 + 0-terminator */ | ||
231 | char after[36]; /* 16 * 2 + 3 dots + 0-terminator */ | ||
232 | char beforep[36 + 2]; /* 16 * 2 + 3 dots + 0-terminator + ()*/ | ||
233 | char middlehp[33 + 2]; /* 16 * 2 + 0-terminator + () */ | ||
234 | char middlelp[33 + 2]; /* 16 * 2 + 0-terminator + () */ | ||
235 | char afterp[36 + 2]; /* 16 * 2 + 3 dots + 0-terminator + () */ | ||
236 | char dots[5 * strlen (DOT)]; | ||
237 | char buf[3]; | ||
238 | char *middle; | ||
239 | char *ret; | ||
240 | unsigned int xstep; | ||
241 | char *recl; | ||
242 | char *rech; | ||
243 | char *reclp; | ||
244 | char *rechp; | ||
245 | unsigned int start_port; | ||
246 | unsigned int end_port; | ||
247 | |||
248 | GNUNET_assert (GNUNET_YES == pp->negate_portrange); | ||
249 | start_port = pp->start_port; | ||
250 | if (1 == start_port) | ||
251 | start_port = 0; | ||
252 | end_port = pp->end_port; | ||
253 | GNUNET_assert ((end - start) / step <= 0xF); | ||
254 | before[0] = '\0'; | ||
255 | middlel[0] = '\0'; | ||
256 | middleh[0] = '\0'; | ||
257 | after[0] = '\0'; | ||
258 | for (i = start; i <= end; i += step) | ||
259 | { | ||
260 | GNUNET_snprintf (buf, | ||
261 | sizeof(buf), | ||
262 | "%X|", | ||
263 | (i - start) / step); | ||
264 | if (i / step < start_port / step) | ||
265 | strcat (before, buf); | ||
266 | else if (i / step > end_port / step) | ||
267 | strcat (after, buf); | ||
268 | else if (i / step == start_port / step) | ||
269 | strcat (middlel, buf); | ||
270 | else if (i / step == end_port / step) | ||
271 | strcat (middleh, buf); | ||
272 | } | ||
273 | if (strlen (before) > 0) | ||
274 | before[strlen (before) - 1] = '\0'; | ||
275 | if (strlen (middlel) > 0) | ||
276 | middlel[strlen (middlel) - 1] = '\0'; | ||
277 | if (strlen (middleh) > 0) | ||
278 | middleh[strlen (middleh) - 1] = '\0'; | ||
279 | if (strlen (after) > 0) | ||
280 | after[strlen (after) - 1] = '\0'; | ||
281 | if (needs_parens (before)) | ||
282 | GNUNET_snprintf (beforep, | ||
283 | sizeof(beforep), | ||
284 | "(%s)", | ||
285 | before); | ||
286 | else | ||
287 | strcpy (beforep, before); | ||
288 | if (needs_parens (middlel)) | ||
289 | GNUNET_snprintf (middlelp, | ||
290 | sizeof(middlelp), | ||
291 | "(%s)", | ||
292 | middlel); | ||
293 | else | ||
294 | strcpy (middlelp, middlel); | ||
295 | if (needs_parens (middleh)) | ||
296 | GNUNET_snprintf (middlehp, | ||
297 | sizeof(middlehp), | ||
298 | "(%s)", | ||
299 | middleh); | ||
300 | else | ||
301 | strcpy (middlehp, middleh); | ||
302 | if (needs_parens (after)) | ||
303 | GNUNET_snprintf (afterp, | ||
304 | sizeof(afterp), | ||
305 | "(%s)", | ||
306 | after); | ||
307 | else | ||
308 | strcpy (afterp, after); | ||
309 | dots[0] = '\0'; | ||
310 | for (xstep = step / 16; xstep > 0; xstep /= 16) | ||
311 | strcat (dots, DOT); | ||
312 | if (step >= 16) | ||
313 | { | ||
314 | if (strlen (middlel) > 0) | ||
315 | recl = compute_policy ((start_port / step) * step, | ||
316 | (start_port / step) * step + step - 1, | ||
317 | step / 16, | ||
318 | pp); | ||
319 | else | ||
320 | recl = GNUNET_strdup (""); | ||
321 | if (strlen (middleh) > 0) | ||
322 | rech = compute_policy ((end_port / step) * step, | ||
323 | (end_port / step) * step + step - 1, | ||
324 | step / 16, | ||
325 | pp); | ||
326 | else | ||
327 | rech = GNUNET_strdup (""); | ||
328 | } | ||
329 | else | ||
330 | { | ||
331 | recl = GNUNET_strdup (""); | ||
332 | rech = GNUNET_strdup (""); | ||
333 | middlel[0] = '\0'; | ||
334 | middlelp[0] = '\0'; | ||
335 | middleh[0] = '\0'; | ||
336 | middlehp[0] = '\0'; | ||
337 | } | ||
338 | if (needs_parens (recl)) | ||
339 | GNUNET_asprintf (&reclp, | ||
340 | "(%s)", | ||
341 | recl); | ||
342 | else | ||
343 | reclp = GNUNET_strdup (recl); | ||
344 | if (needs_parens (rech)) | ||
345 | GNUNET_asprintf (&rechp, | ||
346 | "(%s)", | ||
347 | rech); | ||
348 | else | ||
349 | rechp = GNUNET_strdup (rech); | ||
350 | |||
351 | if ((strlen (middleh) > 0) && | ||
352 | (strlen (rech) > 0) && | ||
353 | (strlen (middlel) > 0) && | ||
354 | (strlen (recl) > 0)) | ||
355 | { | ||
356 | GNUNET_asprintf (&middle, | ||
357 | "%s%s|%s%s", | ||
358 | middlel, | ||
359 | reclp, | ||
360 | middleh, | ||
361 | rechp); | ||
362 | } | ||
363 | else if ((strlen (middleh) > 0) && | ||
364 | (strlen (rech) > 0)) | ||
365 | { | ||
366 | GNUNET_asprintf (&middle, | ||
367 | "%s%s", | ||
368 | middleh, | ||
369 | rechp); | ||
370 | } | ||
371 | else if ((strlen (middlel) > 0) && | ||
372 | (strlen (recl) > 0)) | ||
373 | { | ||
374 | GNUNET_asprintf (&middle, | ||
375 | "%s%s", | ||
376 | middlel, | ||
377 | reclp); | ||
378 | } | ||
379 | else | ||
380 | { | ||
381 | middle = GNUNET_strdup (""); | ||
382 | } | ||
383 | if ((strlen (before) > 0) && | ||
384 | (strlen (after) > 0)) | ||
385 | { | ||
386 | if (strlen (dots) > 0) | ||
387 | { | ||
388 | if (strlen (middle) > 0) | ||
389 | GNUNET_asprintf (&ret, | ||
390 | "(%s%s|%s|%s%s)", | ||
391 | beforep, dots, | ||
392 | middle, | ||
393 | afterp, dots); | ||
394 | else | ||
395 | GNUNET_asprintf (&ret, | ||
396 | "(%s|%s)%s", | ||
397 | beforep, | ||
398 | afterp, | ||
399 | dots); | ||
400 | } | ||
401 | else | ||
402 | { | ||
403 | if (strlen (middle) > 0) | ||
404 | GNUNET_asprintf (&ret, | ||
405 | "(%s|%s|%s)", | ||
406 | before, | ||
407 | middle, | ||
408 | after); | ||
409 | else if (1 == step) | ||
410 | GNUNET_asprintf (&ret, | ||
411 | "%s|%s", | ||
412 | before, | ||
413 | after); | ||
414 | else | ||
415 | GNUNET_asprintf (&ret, | ||
416 | "(%s|%s)", | ||
417 | before, | ||
418 | after); | ||
419 | } | ||
420 | } | ||
421 | else if (strlen (before) > 0) | ||
422 | { | ||
423 | if (strlen (dots) > 0) | ||
424 | { | ||
425 | if (strlen (middle) > 0) | ||
426 | GNUNET_asprintf (&ret, | ||
427 | "(%s%s|%s)", | ||
428 | beforep, dots, | ||
429 | middle); | ||
430 | else | ||
431 | GNUNET_asprintf (&ret, | ||
432 | "%s%s", | ||
433 | beforep, dots); | ||
434 | } | ||
435 | else | ||
436 | { | ||
437 | if (strlen (middle) > 0) | ||
438 | GNUNET_asprintf (&ret, | ||
439 | "(%s|%s)", | ||
440 | before, | ||
441 | middle); | ||
442 | else | ||
443 | GNUNET_asprintf (&ret, | ||
444 | "%s", | ||
445 | before); | ||
446 | } | ||
447 | } | ||
448 | else if (strlen (after) > 0) | ||
449 | { | ||
450 | if (strlen (dots) > 0) | ||
451 | { | ||
452 | if (strlen (middle) > 0) | ||
453 | GNUNET_asprintf (&ret, | ||
454 | "(%s|%s%s)", | ||
455 | middle, | ||
456 | afterp, dots); | ||
457 | else | ||
458 | GNUNET_asprintf (&ret, | ||
459 | "%s%s", | ||
460 | afterp, dots); | ||
461 | } | ||
462 | else | ||
463 | { | ||
464 | if (strlen (middle) > 0) | ||
465 | GNUNET_asprintf (&ret, | ||
466 | "%s|%s", | ||
467 | middle, | ||
468 | after); | ||
469 | else | ||
470 | GNUNET_asprintf (&ret, | ||
471 | "%s", | ||
472 | after); | ||
473 | } | ||
474 | } | ||
475 | else if (strlen (middle) > 0) | ||
476 | { | ||
477 | GNUNET_asprintf (&ret, | ||
478 | "%s", | ||
479 | middle); | ||
480 | } | ||
481 | else | ||
482 | { | ||
483 | ret = GNUNET_strdup (""); | ||
484 | } | ||
485 | GNUNET_free (middle); | ||
486 | GNUNET_free (reclp); | ||
487 | GNUNET_free (rechp); | ||
488 | GNUNET_free (recl); | ||
489 | GNUNET_free (rech); | ||
490 | return ret; | ||
491 | } | ||
492 | |||
493 | |||
494 | /** | ||
495 | * Convert a port policy to a regular expression. Note: this is a | ||
496 | * very simplistic implementation, we might want to consider doing | ||
497 | * something more sophisiticated (resulting in smaller regular | ||
498 | * expressions) at a later time. | ||
499 | * | ||
500 | * @param pp port policy to convert | ||
501 | * @return NULL on error | ||
502 | */ | ||
503 | static char * | ||
504 | port_to_regex (const struct GNUNET_STRINGS_PortPolicy *pp) | ||
505 | { | ||
506 | char *reg; | ||
507 | char *ret; | ||
508 | char *pos; | ||
509 | unsigned int i; | ||
510 | unsigned int cnt; | ||
511 | |||
512 | if ((0 == pp->start_port) || | ||
513 | ((1 == pp->start_port) && | ||
514 | (0xFFFF == pp->end_port) && | ||
515 | (GNUNET_NO == pp->negate_portrange))) | ||
516 | return GNUNET_strdup (DOT DOT DOT DOT); | ||
517 | if ((pp->start_port == pp->end_port) && | ||
518 | (GNUNET_NO == pp->negate_portrange)) | ||
519 | { | ||
520 | GNUNET_asprintf (&ret, | ||
521 | "%04X", | ||
522 | pp->start_port); | ||
523 | return ret; | ||
524 | } | ||
525 | if (pp->end_port < pp->start_port) | ||
526 | return NULL; | ||
527 | |||
528 | if (GNUNET_YES == pp->negate_portrange) | ||
529 | { | ||
530 | ret = compute_policy (0, 0xFFFF, 0x1000, pp); | ||
531 | } | ||
532 | else | ||
533 | { | ||
534 | cnt = pp->end_port - pp->start_port + 1; | ||
535 | reg = GNUNET_malloc (cnt * 5 + 1); | ||
536 | pos = reg; | ||
537 | for (i = 1; i <= 0xFFFF; i++) | ||
538 | { | ||
539 | if ((i >= pp->start_port) && (i <= pp->end_port)) | ||
540 | { | ||
541 | if (pos == reg) | ||
542 | { | ||
543 | GNUNET_snprintf (pos, | ||
544 | 5, | ||
545 | "%04X", | ||
546 | i); | ||
547 | } | ||
548 | else | ||
549 | { | ||
550 | GNUNET_snprintf (pos, | ||
551 | 6, | ||
552 | "|%04X", | ||
553 | i); | ||
554 | } | ||
555 | pos += strlen (pos); | ||
556 | } | ||
557 | } | ||
558 | GNUNET_asprintf (&ret, | ||
559 | "(%s)", | ||
560 | reg); | ||
561 | GNUNET_free (reg); | ||
562 | } | ||
563 | return ret; | ||
564 | } | ||
565 | |||
566 | |||
567 | /** | ||
568 | * Convert an address (IPv4 or IPv6) to a regex. | ||
569 | * | ||
570 | * @param addr address | ||
571 | * @param mask network mask | ||
572 | * @param len number of bytes in @a addr and @a mask | ||
573 | * @return NULL on error, otherwise regex for the address | ||
574 | */ | ||
575 | static char * | ||
576 | address_to_regex (const void *addr, | ||
577 | const void *mask, | ||
578 | size_t len) | ||
579 | { | ||
580 | const uint16_t *a = addr; | ||
581 | const uint16_t *m = mask; | ||
582 | char *ret; | ||
583 | char *tmp; | ||
584 | char *reg; | ||
585 | unsigned int i; | ||
586 | |||
587 | ret = NULL; | ||
588 | GNUNET_assert (1 != (len % 2)); | ||
589 | for (i = 0; i < len / 2; i++) | ||
590 | { | ||
591 | reg = num_to_regex (a[i], m[i]); | ||
592 | if (NULL == reg) | ||
593 | { | ||
594 | GNUNET_free (ret); | ||
595 | return NULL; | ||
596 | } | ||
597 | if (NULL == ret) | ||
598 | { | ||
599 | ret = reg; | ||
600 | } | ||
601 | else | ||
602 | { | ||
603 | GNUNET_asprintf (&tmp, | ||
604 | "%s%s", | ||
605 | ret, reg); | ||
606 | GNUNET_free (ret); | ||
607 | GNUNET_free (reg); | ||
608 | ret = tmp; | ||
609 | } | ||
610 | } | ||
611 | return ret; | ||
612 | } | ||
613 | |||
614 | |||
615 | /** | ||
616 | * Convert a single line of an IPv4 policy to a regular expression. | ||
617 | * | ||
618 | * @param v4 line to convert | ||
619 | * @return NULL on error | ||
620 | */ | ||
621 | static char * | ||
622 | ipv4_to_regex (const struct GNUNET_STRINGS_IPv4NetworkPolicy *v4) | ||
623 | { | ||
624 | char *reg; | ||
625 | char *pp; | ||
626 | char *ret; | ||
627 | |||
628 | reg = address_to_regex (&v4->network, | ||
629 | &v4->netmask, | ||
630 | sizeof(struct in_addr)); | ||
631 | if (NULL == reg) | ||
632 | return NULL; | ||
633 | pp = port_to_regex (&v4->pp); | ||
634 | if (NULL == pp) | ||
635 | { | ||
636 | GNUNET_free (reg); | ||
637 | return NULL; | ||
638 | } | ||
639 | GNUNET_asprintf (&ret, | ||
640 | "4-%s-%s", | ||
641 | pp, reg); | ||
642 | GNUNET_free (pp); | ||
643 | GNUNET_free (reg); | ||
644 | return ret; | ||
645 | } | ||
646 | |||
647 | |||
648 | /** | ||
649 | * Convert a single line of an IPv4 policy to a regular expression. | ||
650 | * | ||
651 | * @param v6 line to convert | ||
652 | * @return NULL on error | ||
653 | */ | ||
654 | static char * | ||
655 | ipv6_to_regex (const struct GNUNET_STRINGS_IPv6NetworkPolicy *v6) | ||
656 | { | ||
657 | char *reg; | ||
658 | char *pp; | ||
659 | char *ret; | ||
660 | |||
661 | reg = address_to_regex (&v6->network, | ||
662 | &v6->netmask, | ||
663 | sizeof(struct in6_addr)); | ||
664 | if (NULL == reg) | ||
665 | return NULL; | ||
666 | pp = port_to_regex (&v6->pp); | ||
667 | if (NULL == pp) | ||
668 | { | ||
669 | GNUNET_free (reg); | ||
670 | return NULL; | ||
671 | } | ||
672 | GNUNET_asprintf (&ret, | ||
673 | "6-%s-%s", | ||
674 | pp, reg); | ||
675 | GNUNET_free (pp); | ||
676 | GNUNET_free (reg); | ||
677 | return ret; | ||
678 | } | ||
679 | |||
680 | |||
681 | char * | ||
682 | GNUNET_TUN_ipv4policy2regex (const char *policy) | ||
683 | { | ||
684 | struct GNUNET_STRINGS_IPv4NetworkPolicy *np; | ||
685 | char *reg; | ||
686 | char *tmp; | ||
687 | char *line; | ||
688 | unsigned int i; | ||
689 | |||
690 | np = GNUNET_STRINGS_parse_ipv4_policy (policy); | ||
691 | if (NULL == np) | ||
692 | return NULL; | ||
693 | reg = NULL; | ||
694 | for (i = 0; (0 == i) || (0 != np[i].network.s_addr); i++) | ||
695 | { | ||
696 | line = ipv4_to_regex (&np[i]); | ||
697 | if (NULL == line) | ||
698 | { | ||
699 | GNUNET_free (reg); | ||
700 | GNUNET_free (np); | ||
701 | return NULL; | ||
702 | } | ||
703 | if (NULL == reg) | ||
704 | { | ||
705 | reg = line; | ||
706 | } | ||
707 | else | ||
708 | { | ||
709 | GNUNET_asprintf (&tmp, | ||
710 | "%s|(%s)", | ||
711 | reg, line); | ||
712 | GNUNET_free (reg); | ||
713 | GNUNET_free (line); | ||
714 | reg = tmp; | ||
715 | } | ||
716 | if (0 == np[i].network.s_addr) | ||
717 | break; | ||
718 | } | ||
719 | GNUNET_free (np); | ||
720 | return reg; | ||
721 | } | ||
722 | |||
723 | |||
724 | char * | ||
725 | GNUNET_TUN_ipv6policy2regex (const char *policy) | ||
726 | { | ||
727 | struct in6_addr zero; | ||
728 | struct GNUNET_STRINGS_IPv6NetworkPolicy *np; | ||
729 | char *reg; | ||
730 | char *tmp; | ||
731 | char *line; | ||
732 | unsigned int i; | ||
733 | |||
734 | np = GNUNET_STRINGS_parse_ipv6_policy (policy); | ||
735 | if (NULL == np) | ||
736 | return NULL; | ||
737 | reg = NULL; | ||
738 | memset (&zero, 0, sizeof(struct in6_addr)); | ||
739 | for (i = 0; (0 == i) || (0 != memcmp (&zero, &np[i].network, sizeof(struct | ||
740 | in6_addr))); | ||
741 | i++) | ||
742 | { | ||
743 | line = ipv6_to_regex (&np[i]); | ||
744 | if (NULL == line) | ||
745 | { | ||
746 | GNUNET_free (reg); | ||
747 | GNUNET_free (np); | ||
748 | return NULL; | ||
749 | } | ||
750 | if (NULL == reg) | ||
751 | { | ||
752 | reg = line; | ||
753 | } | ||
754 | else | ||
755 | { | ||
756 | GNUNET_asprintf (&tmp, | ||
757 | "%s|(%s)", | ||
758 | reg, line); | ||
759 | GNUNET_free (reg); | ||
760 | GNUNET_free (line); | ||
761 | reg = tmp; | ||
762 | } | ||
763 | if (0 == memcmp (&zero, &np[i].network, sizeof(struct in6_addr))) | ||
764 | break; | ||
765 | } | ||
766 | GNUNET_free (np); | ||
767 | return reg; | ||
768 | } | ||
769 | |||
770 | |||
771 | void | ||
772 | GNUNET_TUN_service_name_to_hash (const char *service_name, | ||
773 | struct GNUNET_HashCode *hc) | ||
774 | { | ||
775 | GNUNET_CRYPTO_hash (service_name, | ||
776 | strlen (service_name), | ||
777 | hc); | ||
778 | } | ||
779 | |||
780 | |||
781 | /** | ||
782 | * Compute the CADET port given a service descriptor | ||
783 | * (returned from #GNUNET_TUN_service_name_to_hash) and | ||
784 | * a TCP/UDP port @a ip_port. | ||
785 | * | ||
786 | * @param desc service shared secret | ||
787 | * @param ip_port TCP/UDP port, use 0 for ICMP | ||
788 | * @param[out] cadet_port CADET port to use | ||
789 | */ | ||
790 | void | ||
791 | GNUNET_TUN_compute_service_cadet_port (const struct GNUNET_HashCode *desc, | ||
792 | uint16_t ip_port, | ||
793 | struct GNUNET_HashCode *cadet_port) | ||
794 | { | ||
795 | uint16_t be_port = htons (ip_port); | ||
796 | |||
797 | *cadet_port = *desc; | ||
798 | GNUNET_memcpy (cadet_port, | ||
799 | &be_port, | ||
800 | sizeof(uint16_t)); | ||
801 | } | ||
802 | |||
803 | |||
804 | /* end of regex.c */ | ||