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1 | /*** | |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright 2014 Lennart Poettering | |
5 | ||
6 | systemd is free software; you can redistribute it and/or modify it | |
7 | under the terms of the GNU Lesser General Public License as published by | |
8 | the Free Software Foundation; either version 2.1 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | systemd is distributed in the hope that it will be useful, but | |
12 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public License | |
17 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
18 | ***/ | |
19 | ||
20 | #include <math.h> | |
21 | ||
22 | #include "alloc-util.h" | |
23 | #include "dns-domain.h" | |
24 | #include "dns-type.h" | |
25 | #include "escape.h" | |
26 | #include "hexdecoct.h" | |
27 | #include "resolved-dns-dnssec.h" | |
28 | #include "resolved-dns-packet.h" | |
29 | #include "resolved-dns-rr.h" | |
30 | #include "string-table.h" | |
31 | #include "string-util.h" | |
32 | #include "strv.h" | |
33 | #include "terminal-util.h" | |
34 | ||
35 | DnsResourceKey* dns_resource_key_new(uint16_t class, uint16_t type, const char *name) { | |
36 | DnsResourceKey *k; | |
37 | size_t l; | |
38 | ||
39 | assert(name); | |
40 | ||
41 | l = strlen(name); | |
42 | k = malloc0(sizeof(DnsResourceKey) + l + 1); | |
43 | if (!k) | |
44 | return NULL; | |
45 | ||
46 | k->n_ref = 1; | |
47 | k->class = class; | |
48 | k->type = type; | |
49 | ||
50 | strcpy((char*) k + sizeof(DnsResourceKey), name); | |
51 | ||
52 | return k; | |
53 | } | |
54 | ||
55 | DnsResourceKey* dns_resource_key_new_redirect(const DnsResourceKey *key, const DnsResourceRecord *cname) { | |
56 | int r; | |
57 | ||
58 | assert(key); | |
59 | assert(cname); | |
60 | ||
61 | assert(IN_SET(cname->key->type, DNS_TYPE_CNAME, DNS_TYPE_DNAME)); | |
62 | ||
63 | if (cname->key->type == DNS_TYPE_CNAME) | |
64 | return dns_resource_key_new(key->class, key->type, cname->cname.name); | |
65 | else { | |
66 | DnsResourceKey *k; | |
67 | char *destination = NULL; | |
68 | ||
69 | r = dns_name_change_suffix(dns_resource_key_name(key), dns_resource_key_name(cname->key), cname->dname.name, &destination); | |
70 | if (r < 0) | |
71 | return NULL; | |
72 | if (r == 0) | |
73 | return dns_resource_key_ref((DnsResourceKey*) key); | |
74 | ||
75 | k = dns_resource_key_new_consume(key->class, key->type, destination); | |
76 | if (!k) { | |
77 | free(destination); | |
78 | return NULL; | |
79 | } | |
80 | ||
81 | return k; | |
82 | } | |
83 | } | |
84 | ||
85 | int dns_resource_key_new_append_suffix(DnsResourceKey **ret, DnsResourceKey *key, char *name) { | |
86 | DnsResourceKey *new_key; | |
87 | char *joined; | |
88 | int r; | |
89 | ||
90 | assert(ret); | |
91 | assert(key); | |
92 | assert(name); | |
93 | ||
94 | if (dns_name_is_root(name)) { | |
95 | *ret = dns_resource_key_ref(key); | |
96 | return 0; | |
97 | } | |
98 | ||
99 | r = dns_name_concat(dns_resource_key_name(key), name, &joined); | |
100 | if (r < 0) | |
101 | return r; | |
102 | ||
103 | new_key = dns_resource_key_new_consume(key->class, key->type, joined); | |
104 | if (!new_key) { | |
105 | free(joined); | |
106 | return -ENOMEM; | |
107 | } | |
108 | ||
109 | *ret = new_key; | |
110 | return 0; | |
111 | } | |
112 | ||
113 | DnsResourceKey* dns_resource_key_new_consume(uint16_t class, uint16_t type, char *name) { | |
114 | DnsResourceKey *k; | |
115 | ||
116 | assert(name); | |
117 | ||
118 | k = new0(DnsResourceKey, 1); | |
119 | if (!k) | |
120 | return NULL; | |
121 | ||
122 | k->n_ref = 1; | |
123 | k->class = class; | |
124 | k->type = type; | |
125 | k->_name = name; | |
126 | ||
127 | return k; | |
128 | } | |
129 | ||
130 | DnsResourceKey* dns_resource_key_ref(DnsResourceKey *k) { | |
131 | ||
132 | if (!k) | |
133 | return NULL; | |
134 | ||
135 | /* Static/const keys created with DNS_RESOURCE_KEY_CONST will | |
136 | * set this to -1, they should not be reffed/unreffed */ | |
137 | assert(k->n_ref != (unsigned) -1); | |
138 | ||
139 | assert(k->n_ref > 0); | |
140 | k->n_ref++; | |
141 | ||
142 | return k; | |
143 | } | |
144 | ||
145 | DnsResourceKey* dns_resource_key_unref(DnsResourceKey *k) { | |
146 | if (!k) | |
147 | return NULL; | |
148 | ||
149 | assert(k->n_ref != (unsigned) -1); | |
150 | assert(k->n_ref > 0); | |
151 | ||
152 | if (k->n_ref == 1) { | |
153 | free(k->_name); | |
154 | free(k); | |
155 | } else | |
156 | k->n_ref--; | |
157 | ||
158 | return NULL; | |
159 | } | |
160 | ||
161 | const char* dns_resource_key_name(const DnsResourceKey *key) { | |
162 | const char *name; | |
163 | ||
164 | if (!key) | |
165 | return NULL; | |
166 | ||
167 | if (key->_name) | |
168 | name = key->_name; | |
169 | else | |
170 | name = (char*) key + sizeof(DnsResourceKey); | |
171 | ||
172 | if (dns_name_is_root(name)) | |
173 | return "."; | |
174 | else | |
175 | return name; | |
176 | } | |
177 | ||
178 | bool dns_resource_key_is_address(const DnsResourceKey *key) { | |
179 | assert(key); | |
180 | ||
181 | /* Check if this is an A or AAAA resource key */ | |
182 | ||
183 | return key->class == DNS_CLASS_IN && IN_SET(key->type, DNS_TYPE_A, DNS_TYPE_AAAA); | |
184 | } | |
185 | ||
186 | int dns_resource_key_equal(const DnsResourceKey *a, const DnsResourceKey *b) { | |
187 | int r; | |
188 | ||
189 | if (a == b) | |
190 | return 1; | |
191 | ||
192 | r = dns_name_equal(dns_resource_key_name(a), dns_resource_key_name(b)); | |
193 | if (r <= 0) | |
194 | return r; | |
195 | ||
196 | if (a->class != b->class) | |
197 | return 0; | |
198 | ||
199 | if (a->type != b->type) | |
200 | return 0; | |
201 | ||
202 | return 1; | |
203 | } | |
204 | ||
205 | int dns_resource_key_match_rr(const DnsResourceKey *key, DnsResourceRecord *rr, const char *search_domain) { | |
206 | int r; | |
207 | ||
208 | assert(key); | |
209 | assert(rr); | |
210 | ||
211 | if (key == rr->key) | |
212 | return 1; | |
213 | ||
214 | /* Checks if an rr matches the specified key. If a search | |
215 | * domain is specified, it will also be checked if the key | |
216 | * with the search domain suffixed might match the RR. */ | |
217 | ||
218 | if (rr->key->class != key->class && key->class != DNS_CLASS_ANY) | |
219 | return 0; | |
220 | ||
221 | if (rr->key->type != key->type && key->type != DNS_TYPE_ANY) | |
222 | return 0; | |
223 | ||
224 | r = dns_name_equal(dns_resource_key_name(rr->key), dns_resource_key_name(key)); | |
225 | if (r != 0) | |
226 | return r; | |
227 | ||
228 | if (search_domain) { | |
229 | _cleanup_free_ char *joined = NULL; | |
230 | ||
231 | r = dns_name_concat(dns_resource_key_name(key), search_domain, &joined); | |
232 | if (r < 0) | |
233 | return r; | |
234 | ||
235 | return dns_name_equal(dns_resource_key_name(rr->key), joined); | |
236 | } | |
237 | ||
238 | return 0; | |
239 | } | |
240 | ||
241 | int dns_resource_key_match_cname_or_dname(const DnsResourceKey *key, const DnsResourceKey *cname, const char *search_domain) { | |
242 | int r; | |
243 | ||
244 | assert(key); | |
245 | assert(cname); | |
246 | ||
247 | if (cname->class != key->class && key->class != DNS_CLASS_ANY) | |
248 | return 0; | |
249 | ||
250 | if (cname->type == DNS_TYPE_CNAME) | |
251 | r = dns_name_equal(dns_resource_key_name(key), dns_resource_key_name(cname)); | |
252 | else if (cname->type == DNS_TYPE_DNAME) | |
253 | r = dns_name_endswith(dns_resource_key_name(key), dns_resource_key_name(cname)); | |
254 | else | |
255 | return 0; | |
256 | ||
257 | if (r != 0) | |
258 | return r; | |
259 | ||
260 | if (search_domain) { | |
261 | _cleanup_free_ char *joined = NULL; | |
262 | ||
263 | r = dns_name_concat(dns_resource_key_name(key), search_domain, &joined); | |
264 | if (r < 0) | |
265 | return r; | |
266 | ||
267 | if (cname->type == DNS_TYPE_CNAME) | |
268 | return dns_name_equal(joined, dns_resource_key_name(cname)); | |
269 | else if (cname->type == DNS_TYPE_DNAME) | |
270 | return dns_name_endswith(joined, dns_resource_key_name(cname)); | |
271 | } | |
272 | ||
273 | return 0; | |
274 | } | |
275 | ||
276 | int dns_resource_key_match_soa(const DnsResourceKey *key, const DnsResourceKey *soa) { | |
277 | assert(soa); | |
278 | assert(key); | |
279 | ||
280 | /* Checks whether 'soa' is a SOA record for the specified key. */ | |
281 | ||
282 | if (soa->class != key->class) | |
283 | return 0; | |
284 | ||
285 | if (soa->type != DNS_TYPE_SOA) | |
286 | return 0; | |
287 | ||
288 | return dns_name_endswith(dns_resource_key_name(key), dns_resource_key_name(soa)); | |
289 | } | |
290 | ||
291 | static void dns_resource_key_hash_func(const void *i, struct siphash *state) { | |
292 | const DnsResourceKey *k = i; | |
293 | ||
294 | assert(k); | |
295 | ||
296 | dns_name_hash_func(dns_resource_key_name(k), state); | |
297 | siphash24_compress(&k->class, sizeof(k->class), state); | |
298 | siphash24_compress(&k->type, sizeof(k->type), state); | |
299 | } | |
300 | ||
301 | static int dns_resource_key_compare_func(const void *a, const void *b) { | |
302 | const DnsResourceKey *x = a, *y = b; | |
303 | int ret; | |
304 | ||
305 | ret = dns_name_compare_func(dns_resource_key_name(x), dns_resource_key_name(y)); | |
306 | if (ret != 0) | |
307 | return ret; | |
308 | ||
309 | if (x->type < y->type) | |
310 | return -1; | |
311 | if (x->type > y->type) | |
312 | return 1; | |
313 | ||
314 | if (x->class < y->class) | |
315 | return -1; | |
316 | if (x->class > y->class) | |
317 | return 1; | |
318 | ||
319 | return 0; | |
320 | } | |
321 | ||
322 | const struct hash_ops dns_resource_key_hash_ops = { | |
323 | .hash = dns_resource_key_hash_func, | |
324 | .compare = dns_resource_key_compare_func | |
325 | }; | |
326 | ||
327 | char* dns_resource_key_to_string(const DnsResourceKey *key, char *buf, size_t buf_size) { | |
328 | const char *c, *t; | |
329 | char *ans = buf; | |
330 | ||
331 | /* If we cannot convert the CLASS/TYPE into a known string, | |
332 | use the format recommended by RFC 3597, Section 5. */ | |
333 | ||
334 | c = dns_class_to_string(key->class); | |
335 | t = dns_type_to_string(key->type); | |
336 | ||
337 | snprintf(buf, buf_size, "%s %s%s%.0u %s%s%.0u", | |
338 | dns_resource_key_name(key), | |
339 | c ?: "", c ? "" : "CLASS", c ? 0 : key->class, | |
340 | t ?: "", t ? "" : "TYPE", t ? 0 : key->class); | |
341 | ||
342 | return ans; | |
343 | } | |
344 | ||
345 | bool dns_resource_key_reduce(DnsResourceKey **a, DnsResourceKey **b) { | |
346 | assert(a); | |
347 | assert(b); | |
348 | ||
349 | /* Try to replace one RR key by another if they are identical, thus saving a bit of memory. Note that we do | |
350 | * this only for RR keys, not for RRs themselves, as they carry a lot of additional metadata (where they come | |
351 | * from, validity data, and suchlike), and cannot be replaced so easily by other RRs that have the same | |
352 | * superficial data. */ | |
353 | ||
354 | if (!*a) | |
355 | return false; | |
356 | if (!*b) | |
357 | return false; | |
358 | ||
359 | /* We refuse merging const keys */ | |
360 | if ((*a)->n_ref == (unsigned) -1) | |
361 | return false; | |
362 | if ((*b)->n_ref == (unsigned) -1) | |
363 | return false; | |
364 | ||
365 | /* Already the same? */ | |
366 | if (*a == *b) | |
367 | return true; | |
368 | ||
369 | /* Are they really identical? */ | |
370 | if (dns_resource_key_equal(*a, *b) <= 0) | |
371 | return false; | |
372 | ||
373 | /* Keep the one which already has more references. */ | |
374 | if ((*a)->n_ref > (*b)->n_ref) { | |
375 | dns_resource_key_unref(*b); | |
376 | *b = dns_resource_key_ref(*a); | |
377 | } else { | |
378 | dns_resource_key_unref(*a); | |
379 | *a = dns_resource_key_ref(*b); | |
380 | } | |
381 | ||
382 | return true; | |
383 | } | |
384 | ||
385 | DnsResourceRecord* dns_resource_record_new(DnsResourceKey *key) { | |
386 | DnsResourceRecord *rr; | |
387 | ||
388 | rr = new0(DnsResourceRecord, 1); | |
389 | if (!rr) | |
390 | return NULL; | |
391 | ||
392 | rr->n_ref = 1; | |
393 | rr->key = dns_resource_key_ref(key); | |
394 | rr->expiry = USEC_INFINITY; | |
395 | rr->n_skip_labels_signer = rr->n_skip_labels_source = (unsigned) -1; | |
396 | ||
397 | return rr; | |
398 | } | |
399 | ||
400 | DnsResourceRecord* dns_resource_record_new_full(uint16_t class, uint16_t type, const char *name) { | |
401 | _cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL; | |
402 | ||
403 | key = dns_resource_key_new(class, type, name); | |
404 | if (!key) | |
405 | return NULL; | |
406 | ||
407 | return dns_resource_record_new(key); | |
408 | } | |
409 | ||
410 | DnsResourceRecord* dns_resource_record_ref(DnsResourceRecord *rr) { | |
411 | if (!rr) | |
412 | return NULL; | |
413 | ||
414 | assert(rr->n_ref > 0); | |
415 | rr->n_ref++; | |
416 | ||
417 | return rr; | |
418 | } | |
419 | ||
420 | DnsResourceRecord* dns_resource_record_unref(DnsResourceRecord *rr) { | |
421 | if (!rr) | |
422 | return NULL; | |
423 | ||
424 | assert(rr->n_ref > 0); | |
425 | ||
426 | if (rr->n_ref > 1) { | |
427 | rr->n_ref--; | |
428 | return NULL; | |
429 | } | |
430 | ||
431 | if (rr->key) { | |
432 | switch(rr->key->type) { | |
433 | ||
434 | case DNS_TYPE_SRV: | |
435 | free(rr->srv.name); | |
436 | break; | |
437 | ||
438 | case DNS_TYPE_PTR: | |
439 | case DNS_TYPE_NS: | |
440 | case DNS_TYPE_CNAME: | |
441 | case DNS_TYPE_DNAME: | |
442 | free(rr->ptr.name); | |
443 | break; | |
444 | ||
445 | case DNS_TYPE_HINFO: | |
446 | free(rr->hinfo.cpu); | |
447 | free(rr->hinfo.os); | |
448 | break; | |
449 | ||
450 | case DNS_TYPE_TXT: | |
451 | case DNS_TYPE_SPF: | |
452 | dns_txt_item_free_all(rr->txt.items); | |
453 | break; | |
454 | ||
455 | case DNS_TYPE_SOA: | |
456 | free(rr->soa.mname); | |
457 | free(rr->soa.rname); | |
458 | break; | |
459 | ||
460 | case DNS_TYPE_MX: | |
461 | free(rr->mx.exchange); | |
462 | break; | |
463 | ||
464 | case DNS_TYPE_DS: | |
465 | free(rr->ds.digest); | |
466 | break; | |
467 | ||
468 | case DNS_TYPE_SSHFP: | |
469 | free(rr->sshfp.fingerprint); | |
470 | break; | |
471 | ||
472 | case DNS_TYPE_DNSKEY: | |
473 | free(rr->dnskey.key); | |
474 | break; | |
475 | ||
476 | case DNS_TYPE_RRSIG: | |
477 | free(rr->rrsig.signer); | |
478 | free(rr->rrsig.signature); | |
479 | break; | |
480 | ||
481 | case DNS_TYPE_NSEC: | |
482 | free(rr->nsec.next_domain_name); | |
483 | bitmap_free(rr->nsec.types); | |
484 | break; | |
485 | ||
486 | case DNS_TYPE_NSEC3: | |
487 | free(rr->nsec3.next_hashed_name); | |
488 | free(rr->nsec3.salt); | |
489 | bitmap_free(rr->nsec3.types); | |
490 | break; | |
491 | ||
492 | case DNS_TYPE_LOC: | |
493 | case DNS_TYPE_A: | |
494 | case DNS_TYPE_AAAA: | |
495 | break; | |
496 | ||
497 | case DNS_TYPE_TLSA: | |
498 | free(rr->tlsa.data); | |
499 | break; | |
500 | ||
501 | case DNS_TYPE_CAA: | |
502 | free(rr->caa.tag); | |
503 | free(rr->caa.value); | |
504 | break; | |
505 | ||
506 | case DNS_TYPE_OPENPGPKEY: | |
507 | default: | |
508 | free(rr->generic.data); | |
509 | } | |
510 | ||
511 | free(rr->wire_format); | |
512 | dns_resource_key_unref(rr->key); | |
513 | } | |
514 | ||
515 | free(rr->to_string); | |
516 | free(rr); | |
517 | ||
518 | return NULL; | |
519 | } | |
520 | ||
521 | int dns_resource_record_new_reverse(DnsResourceRecord **ret, int family, const union in_addr_union *address, const char *hostname) { | |
522 | _cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL; | |
523 | _cleanup_(dns_resource_record_unrefp) DnsResourceRecord *rr = NULL; | |
524 | _cleanup_free_ char *ptr = NULL; | |
525 | int r; | |
526 | ||
527 | assert(ret); | |
528 | assert(address); | |
529 | assert(hostname); | |
530 | ||
531 | r = dns_name_reverse(family, address, &ptr); | |
532 | if (r < 0) | |
533 | return r; | |
534 | ||
535 | key = dns_resource_key_new_consume(DNS_CLASS_IN, DNS_TYPE_PTR, ptr); | |
536 | if (!key) | |
537 | return -ENOMEM; | |
538 | ||
539 | ptr = NULL; | |
540 | ||
541 | rr = dns_resource_record_new(key); | |
542 | if (!rr) | |
543 | return -ENOMEM; | |
544 | ||
545 | rr->ptr.name = strdup(hostname); | |
546 | if (!rr->ptr.name) | |
547 | return -ENOMEM; | |
548 | ||
549 | *ret = rr; | |
550 | rr = NULL; | |
551 | ||
552 | return 0; | |
553 | } | |
554 | ||
555 | int dns_resource_record_new_address(DnsResourceRecord **ret, int family, const union in_addr_union *address, const char *name) { | |
556 | DnsResourceRecord *rr; | |
557 | ||
558 | assert(ret); | |
559 | assert(address); | |
560 | assert(family); | |
561 | ||
562 | if (family == AF_INET) { | |
563 | ||
564 | rr = dns_resource_record_new_full(DNS_CLASS_IN, DNS_TYPE_A, name); | |
565 | if (!rr) | |
566 | return -ENOMEM; | |
567 | ||
568 | rr->a.in_addr = address->in; | |
569 | ||
570 | } else if (family == AF_INET6) { | |
571 | ||
572 | rr = dns_resource_record_new_full(DNS_CLASS_IN, DNS_TYPE_AAAA, name); | |
573 | if (!rr) | |
574 | return -ENOMEM; | |
575 | ||
576 | rr->aaaa.in6_addr = address->in6; | |
577 | } else | |
578 | return -EAFNOSUPPORT; | |
579 | ||
580 | *ret = rr; | |
581 | ||
582 | return 0; | |
583 | } | |
584 | ||
585 | #define FIELD_EQUAL(a, b, field) \ | |
586 | ((a).field ## _size == (b).field ## _size && \ | |
587 | memcmp((a).field, (b).field, (a).field ## _size) == 0) | |
588 | ||
589 | int dns_resource_record_equal(const DnsResourceRecord *a, const DnsResourceRecord *b) { | |
590 | int r; | |
591 | ||
592 | assert(a); | |
593 | assert(b); | |
594 | ||
595 | if (a == b) | |
596 | return 1; | |
597 | ||
598 | r = dns_resource_key_equal(a->key, b->key); | |
599 | if (r <= 0) | |
600 | return r; | |
601 | ||
602 | if (a->unparseable != b->unparseable) | |
603 | return 0; | |
604 | ||
605 | switch (a->unparseable ? _DNS_TYPE_INVALID : a->key->type) { | |
606 | ||
607 | case DNS_TYPE_SRV: | |
608 | r = dns_name_equal(a->srv.name, b->srv.name); | |
609 | if (r <= 0) | |
610 | return r; | |
611 | ||
612 | return a->srv.priority == b->srv.priority && | |
613 | a->srv.weight == b->srv.weight && | |
614 | a->srv.port == b->srv.port; | |
615 | ||
616 | case DNS_TYPE_PTR: | |
617 | case DNS_TYPE_NS: | |
618 | case DNS_TYPE_CNAME: | |
619 | case DNS_TYPE_DNAME: | |
620 | return dns_name_equal(a->ptr.name, b->ptr.name); | |
621 | ||
622 | case DNS_TYPE_HINFO: | |
623 | return strcaseeq(a->hinfo.cpu, b->hinfo.cpu) && | |
624 | strcaseeq(a->hinfo.os, b->hinfo.os); | |
625 | ||
626 | case DNS_TYPE_SPF: /* exactly the same as TXT */ | |
627 | case DNS_TYPE_TXT: | |
628 | return dns_txt_item_equal(a->txt.items, b->txt.items); | |
629 | ||
630 | case DNS_TYPE_A: | |
631 | return memcmp(&a->a.in_addr, &b->a.in_addr, sizeof(struct in_addr)) == 0; | |
632 | ||
633 | case DNS_TYPE_AAAA: | |
634 | return memcmp(&a->aaaa.in6_addr, &b->aaaa.in6_addr, sizeof(struct in6_addr)) == 0; | |
635 | ||
636 | case DNS_TYPE_SOA: | |
637 | r = dns_name_equal(a->soa.mname, b->soa.mname); | |
638 | if (r <= 0) | |
639 | return r; | |
640 | r = dns_name_equal(a->soa.rname, b->soa.rname); | |
641 | if (r <= 0) | |
642 | return r; | |
643 | ||
644 | return a->soa.serial == b->soa.serial && | |
645 | a->soa.refresh == b->soa.refresh && | |
646 | a->soa.retry == b->soa.retry && | |
647 | a->soa.expire == b->soa.expire && | |
648 | a->soa.minimum == b->soa.minimum; | |
649 | ||
650 | case DNS_TYPE_MX: | |
651 | if (a->mx.priority != b->mx.priority) | |
652 | return 0; | |
653 | ||
654 | return dns_name_equal(a->mx.exchange, b->mx.exchange); | |
655 | ||
656 | case DNS_TYPE_LOC: | |
657 | assert(a->loc.version == b->loc.version); | |
658 | ||
659 | return a->loc.size == b->loc.size && | |
660 | a->loc.horiz_pre == b->loc.horiz_pre && | |
661 | a->loc.vert_pre == b->loc.vert_pre && | |
662 | a->loc.latitude == b->loc.latitude && | |
663 | a->loc.longitude == b->loc.longitude && | |
664 | a->loc.altitude == b->loc.altitude; | |
665 | ||
666 | case DNS_TYPE_DS: | |
667 | return a->ds.key_tag == b->ds.key_tag && | |
668 | a->ds.algorithm == b->ds.algorithm && | |
669 | a->ds.digest_type == b->ds.digest_type && | |
670 | FIELD_EQUAL(a->ds, b->ds, digest); | |
671 | ||
672 | case DNS_TYPE_SSHFP: | |
673 | return a->sshfp.algorithm == b->sshfp.algorithm && | |
674 | a->sshfp.fptype == b->sshfp.fptype && | |
675 | FIELD_EQUAL(a->sshfp, b->sshfp, fingerprint); | |
676 | ||
677 | case DNS_TYPE_DNSKEY: | |
678 | return a->dnskey.flags == b->dnskey.flags && | |
679 | a->dnskey.protocol == b->dnskey.protocol && | |
680 | a->dnskey.algorithm == b->dnskey.algorithm && | |
681 | FIELD_EQUAL(a->dnskey, b->dnskey, key); | |
682 | ||
683 | case DNS_TYPE_RRSIG: | |
684 | /* do the fast comparisons first */ | |
685 | return a->rrsig.type_covered == b->rrsig.type_covered && | |
686 | a->rrsig.algorithm == b->rrsig.algorithm && | |
687 | a->rrsig.labels == b->rrsig.labels && | |
688 | a->rrsig.original_ttl == b->rrsig.original_ttl && | |
689 | a->rrsig.expiration == b->rrsig.expiration && | |
690 | a->rrsig.inception == b->rrsig.inception && | |
691 | a->rrsig.key_tag == b->rrsig.key_tag && | |
692 | FIELD_EQUAL(a->rrsig, b->rrsig, signature) && | |
693 | dns_name_equal(a->rrsig.signer, b->rrsig.signer); | |
694 | ||
695 | case DNS_TYPE_NSEC: | |
696 | return dns_name_equal(a->nsec.next_domain_name, b->nsec.next_domain_name) && | |
697 | bitmap_equal(a->nsec.types, b->nsec.types); | |
698 | ||
699 | case DNS_TYPE_NSEC3: | |
700 | return a->nsec3.algorithm == b->nsec3.algorithm && | |
701 | a->nsec3.flags == b->nsec3.flags && | |
702 | a->nsec3.iterations == b->nsec3.iterations && | |
703 | FIELD_EQUAL(a->nsec3, b->nsec3, salt) && | |
704 | FIELD_EQUAL(a->nsec3, b->nsec3, next_hashed_name) && | |
705 | bitmap_equal(a->nsec3.types, b->nsec3.types); | |
706 | ||
707 | case DNS_TYPE_TLSA: | |
708 | return a->tlsa.cert_usage == b->tlsa.cert_usage && | |
709 | a->tlsa.selector == b->tlsa.selector && | |
710 | a->tlsa.matching_type == b->tlsa.matching_type && | |
711 | FIELD_EQUAL(a->tlsa, b->tlsa, data); | |
712 | ||
713 | case DNS_TYPE_CAA: | |
714 | return a->caa.flags == b->caa.flags && | |
715 | streq(a->caa.tag, b->caa.tag) && | |
716 | FIELD_EQUAL(a->caa, b->caa, value); | |
717 | ||
718 | case DNS_TYPE_OPENPGPKEY: | |
719 | default: | |
720 | return FIELD_EQUAL(a->generic, b->generic, data); | |
721 | } | |
722 | } | |
723 | ||
724 | static char* format_location(uint32_t latitude, uint32_t longitude, uint32_t altitude, | |
725 | uint8_t size, uint8_t horiz_pre, uint8_t vert_pre) { | |
726 | char *s; | |
727 | char NS = latitude >= 1U<<31 ? 'N' : 'S'; | |
728 | char EW = longitude >= 1U<<31 ? 'E' : 'W'; | |
729 | ||
730 | int lat = latitude >= 1U<<31 ? (int) (latitude - (1U<<31)) : (int) ((1U<<31) - latitude); | |
731 | int lon = longitude >= 1U<<31 ? (int) (longitude - (1U<<31)) : (int) ((1U<<31) - longitude); | |
732 | double alt = altitude >= 10000000u ? altitude - 10000000u : -(double)(10000000u - altitude); | |
733 | double siz = (size >> 4) * exp10((double) (size & 0xF)); | |
734 | double hor = (horiz_pre >> 4) * exp10((double) (horiz_pre & 0xF)); | |
735 | double ver = (vert_pre >> 4) * exp10((double) (vert_pre & 0xF)); | |
736 | ||
737 | if (asprintf(&s, "%d %d %.3f %c %d %d %.3f %c %.2fm %.2fm %.2fm %.2fm", | |
738 | (lat / 60000 / 60), | |
739 | (lat / 60000) % 60, | |
740 | (lat % 60000) / 1000., | |
741 | NS, | |
742 | (lon / 60000 / 60), | |
743 | (lon / 60000) % 60, | |
744 | (lon % 60000) / 1000., | |
745 | EW, | |
746 | alt / 100., | |
747 | siz / 100., | |
748 | hor / 100., | |
749 | ver / 100.) < 0) | |
750 | return NULL; | |
751 | ||
752 | return s; | |
753 | } | |
754 | ||
755 | static int format_timestamp_dns(char *buf, size_t l, time_t sec) { | |
756 | struct tm tm; | |
757 | ||
758 | assert(buf); | |
759 | assert(l > strlen("YYYYMMDDHHmmSS")); | |
760 | ||
761 | if (!gmtime_r(&sec, &tm)) | |
762 | return -EINVAL; | |
763 | ||
764 | if (strftime(buf, l, "%Y%m%d%H%M%S", &tm) <= 0) | |
765 | return -EINVAL; | |
766 | ||
767 | return 0; | |
768 | } | |
769 | ||
770 | static char *format_types(Bitmap *types) { | |
771 | _cleanup_strv_free_ char **strv = NULL; | |
772 | _cleanup_free_ char *str = NULL; | |
773 | Iterator i; | |
774 | unsigned type; | |
775 | int r; | |
776 | ||
777 | BITMAP_FOREACH(type, types, i) { | |
778 | if (dns_type_to_string(type)) { | |
779 | r = strv_extend(&strv, dns_type_to_string(type)); | |
780 | if (r < 0) | |
781 | return NULL; | |
782 | } else { | |
783 | char *t; | |
784 | ||
785 | r = asprintf(&t, "TYPE%u", type); | |
786 | if (r < 0) | |
787 | return NULL; | |
788 | ||
789 | r = strv_consume(&strv, t); | |
790 | if (r < 0) | |
791 | return NULL; | |
792 | } | |
793 | } | |
794 | ||
795 | str = strv_join(strv, " "); | |
796 | if (!str) | |
797 | return NULL; | |
798 | ||
799 | return strjoin("( ", str, " )", NULL); | |
800 | } | |
801 | ||
802 | static char *format_txt(DnsTxtItem *first) { | |
803 | DnsTxtItem *i; | |
804 | size_t c = 1; | |
805 | char *p, *s; | |
806 | ||
807 | LIST_FOREACH(items, i, first) | |
808 | c += i->length * 4 + 3; | |
809 | ||
810 | p = s = new(char, c); | |
811 | if (!s) | |
812 | return NULL; | |
813 | ||
814 | LIST_FOREACH(items, i, first) { | |
815 | size_t j; | |
816 | ||
817 | if (i != first) | |
818 | *(p++) = ' '; | |
819 | ||
820 | *(p++) = '"'; | |
821 | ||
822 | for (j = 0; j < i->length; j++) { | |
823 | if (i->data[j] < ' ' || i->data[j] == '"' || i->data[j] >= 127) { | |
824 | *(p++) = '\\'; | |
825 | *(p++) = '0' + (i->data[j] / 100); | |
826 | *(p++) = '0' + ((i->data[j] / 10) % 10); | |
827 | *(p++) = '0' + (i->data[j] % 10); | |
828 | } else | |
829 | *(p++) = i->data[j]; | |
830 | } | |
831 | ||
832 | *(p++) = '"'; | |
833 | } | |
834 | ||
835 | *p = 0; | |
836 | return s; | |
837 | } | |
838 | ||
839 | const char *dns_resource_record_to_string(DnsResourceRecord *rr) { | |
840 | _cleanup_free_ char *t = NULL; | |
841 | char *s, k[DNS_RESOURCE_KEY_STRING_MAX]; | |
842 | int r; | |
843 | ||
844 | assert(rr); | |
845 | ||
846 | if (rr->to_string) | |
847 | return rr->to_string; | |
848 | ||
849 | dns_resource_key_to_string(rr->key, k, sizeof(k)); | |
850 | ||
851 | switch (rr->unparseable ? _DNS_TYPE_INVALID : rr->key->type) { | |
852 | ||
853 | case DNS_TYPE_SRV: | |
854 | r = asprintf(&s, "%s %u %u %u %s", | |
855 | k, | |
856 | rr->srv.priority, | |
857 | rr->srv.weight, | |
858 | rr->srv.port, | |
859 | strna(rr->srv.name)); | |
860 | if (r < 0) | |
861 | return NULL; | |
862 | break; | |
863 | ||
864 | case DNS_TYPE_PTR: | |
865 | case DNS_TYPE_NS: | |
866 | case DNS_TYPE_CNAME: | |
867 | case DNS_TYPE_DNAME: | |
868 | s = strjoin(k, " ", rr->ptr.name, NULL); | |
869 | if (!s) | |
870 | return NULL; | |
871 | ||
872 | break; | |
873 | ||
874 | case DNS_TYPE_HINFO: | |
875 | s = strjoin(k, " ", rr->hinfo.cpu, " ", rr->hinfo.os, NULL); | |
876 | if (!s) | |
877 | return NULL; | |
878 | break; | |
879 | ||
880 | case DNS_TYPE_SPF: /* exactly the same as TXT */ | |
881 | case DNS_TYPE_TXT: | |
882 | t = format_txt(rr->txt.items); | |
883 | if (!t) | |
884 | return NULL; | |
885 | ||
886 | s = strjoin(k, " ", t, NULL); | |
887 | if (!s) | |
888 | return NULL; | |
889 | break; | |
890 | ||
891 | case DNS_TYPE_A: { | |
892 | _cleanup_free_ char *x = NULL; | |
893 | ||
894 | r = in_addr_to_string(AF_INET, (const union in_addr_union*) &rr->a.in_addr, &x); | |
895 | if (r < 0) | |
896 | return NULL; | |
897 | ||
898 | s = strjoin(k, " ", x, NULL); | |
899 | if (!s) | |
900 | return NULL; | |
901 | break; | |
902 | } | |
903 | ||
904 | case DNS_TYPE_AAAA: | |
905 | r = in_addr_to_string(AF_INET6, (const union in_addr_union*) &rr->aaaa.in6_addr, &t); | |
906 | if (r < 0) | |
907 | return NULL; | |
908 | ||
909 | s = strjoin(k, " ", t, NULL); | |
910 | if (!s) | |
911 | return NULL; | |
912 | break; | |
913 | ||
914 | case DNS_TYPE_SOA: | |
915 | r = asprintf(&s, "%s %s %s %u %u %u %u %u", | |
916 | k, | |
917 | strna(rr->soa.mname), | |
918 | strna(rr->soa.rname), | |
919 | rr->soa.serial, | |
920 | rr->soa.refresh, | |
921 | rr->soa.retry, | |
922 | rr->soa.expire, | |
923 | rr->soa.minimum); | |
924 | if (r < 0) | |
925 | return NULL; | |
926 | break; | |
927 | ||
928 | case DNS_TYPE_MX: | |
929 | r = asprintf(&s, "%s %u %s", | |
930 | k, | |
931 | rr->mx.priority, | |
932 | rr->mx.exchange); | |
933 | if (r < 0) | |
934 | return NULL; | |
935 | break; | |
936 | ||
937 | case DNS_TYPE_LOC: | |
938 | assert(rr->loc.version == 0); | |
939 | ||
940 | t = format_location(rr->loc.latitude, | |
941 | rr->loc.longitude, | |
942 | rr->loc.altitude, | |
943 | rr->loc.size, | |
944 | rr->loc.horiz_pre, | |
945 | rr->loc.vert_pre); | |
946 | if (!t) | |
947 | return NULL; | |
948 | ||
949 | s = strjoin(k, " ", t, NULL); | |
950 | if (!s) | |
951 | return NULL; | |
952 | break; | |
953 | ||
954 | case DNS_TYPE_DS: | |
955 | t = hexmem(rr->ds.digest, rr->ds.digest_size); | |
956 | if (!t) | |
957 | return NULL; | |
958 | ||
959 | r = asprintf(&s, "%s %u %u %u %s", | |
960 | k, | |
961 | rr->ds.key_tag, | |
962 | rr->ds.algorithm, | |
963 | rr->ds.digest_type, | |
964 | t); | |
965 | if (r < 0) | |
966 | return NULL; | |
967 | break; | |
968 | ||
969 | case DNS_TYPE_SSHFP: | |
970 | t = hexmem(rr->sshfp.fingerprint, rr->sshfp.fingerprint_size); | |
971 | if (!t) | |
972 | return NULL; | |
973 | ||
974 | r = asprintf(&s, "%s %u %u %s", | |
975 | k, | |
976 | rr->sshfp.algorithm, | |
977 | rr->sshfp.fptype, | |
978 | t); | |
979 | if (r < 0) | |
980 | return NULL; | |
981 | break; | |
982 | ||
983 | case DNS_TYPE_DNSKEY: { | |
984 | _cleanup_free_ char *alg = NULL; | |
985 | char *ss; | |
986 | int n; | |
987 | uint16_t key_tag; | |
988 | ||
989 | key_tag = dnssec_keytag(rr, true); | |
990 | ||
991 | r = dnssec_algorithm_to_string_alloc(rr->dnskey.algorithm, &alg); | |
992 | if (r < 0) | |
993 | return NULL; | |
994 | ||
995 | r = asprintf(&s, "%s %u %u %s %n", | |
996 | k, | |
997 | rr->dnskey.flags, | |
998 | rr->dnskey.protocol, | |
999 | alg, | |
1000 | &n); | |
1001 | if (r < 0) | |
1002 | return NULL; | |
1003 | ||
1004 | r = base64_append(&s, n, | |
1005 | rr->dnskey.key, rr->dnskey.key_size, | |
1006 | 8, columns()); | |
1007 | if (r < 0) | |
1008 | return NULL; | |
1009 | ||
1010 | r = asprintf(&ss, "%s\n" | |
1011 | " -- Flags:%s%s%s\n" | |
1012 | " -- Key tag: %u", | |
1013 | s, | |
1014 | rr->dnskey.flags & DNSKEY_FLAG_SEP ? " SEP" : "", | |
1015 | rr->dnskey.flags & DNSKEY_FLAG_REVOKE ? " REVOKE" : "", | |
1016 | rr->dnskey.flags & DNSKEY_FLAG_ZONE_KEY ? " ZONE_KEY" : "", | |
1017 | key_tag); | |
1018 | if (r < 0) | |
1019 | return NULL; | |
1020 | free(s); | |
1021 | s = ss; | |
1022 | ||
1023 | break; | |
1024 | } | |
1025 | ||
1026 | case DNS_TYPE_RRSIG: { | |
1027 | _cleanup_free_ char *alg = NULL; | |
1028 | char expiration[strlen("YYYYMMDDHHmmSS") + 1], inception[strlen("YYYYMMDDHHmmSS") + 1]; | |
1029 | const char *type; | |
1030 | int n; | |
1031 | ||
1032 | type = dns_type_to_string(rr->rrsig.type_covered); | |
1033 | ||
1034 | r = dnssec_algorithm_to_string_alloc(rr->rrsig.algorithm, &alg); | |
1035 | if (r < 0) | |
1036 | return NULL; | |
1037 | ||
1038 | r = format_timestamp_dns(expiration, sizeof(expiration), rr->rrsig.expiration); | |
1039 | if (r < 0) | |
1040 | return NULL; | |
1041 | ||
1042 | r = format_timestamp_dns(inception, sizeof(inception), rr->rrsig.inception); | |
1043 | if (r < 0) | |
1044 | return NULL; | |
1045 | ||
1046 | /* TYPE?? follows | |
1047 | * http://tools.ietf.org/html/rfc3597#section-5 */ | |
1048 | ||
1049 | r = asprintf(&s, "%s %s%.*u %s %u %u %s %s %u %s %n", | |
1050 | k, | |
1051 | type ?: "TYPE", | |
1052 | type ? 0 : 1, type ? 0u : (unsigned) rr->rrsig.type_covered, | |
1053 | alg, | |
1054 | rr->rrsig.labels, | |
1055 | rr->rrsig.original_ttl, | |
1056 | expiration, | |
1057 | inception, | |
1058 | rr->rrsig.key_tag, | |
1059 | rr->rrsig.signer, | |
1060 | &n); | |
1061 | if (r < 0) | |
1062 | return NULL; | |
1063 | ||
1064 | r = base64_append(&s, n, | |
1065 | rr->rrsig.signature, rr->rrsig.signature_size, | |
1066 | 8, columns()); | |
1067 | if (r < 0) | |
1068 | return NULL; | |
1069 | ||
1070 | break; | |
1071 | } | |
1072 | ||
1073 | case DNS_TYPE_NSEC: | |
1074 | t = format_types(rr->nsec.types); | |
1075 | if (!t) | |
1076 | return NULL; | |
1077 | ||
1078 | r = asprintf(&s, "%s %s %s", | |
1079 | k, | |
1080 | rr->nsec.next_domain_name, | |
1081 | t); | |
1082 | if (r < 0) | |
1083 | return NULL; | |
1084 | break; | |
1085 | ||
1086 | case DNS_TYPE_NSEC3: { | |
1087 | _cleanup_free_ char *salt = NULL, *hash = NULL; | |
1088 | ||
1089 | if (rr->nsec3.salt_size > 0) { | |
1090 | salt = hexmem(rr->nsec3.salt, rr->nsec3.salt_size); | |
1091 | if (!salt) | |
1092 | return NULL; | |
1093 | } | |
1094 | ||
1095 | hash = base32hexmem(rr->nsec3.next_hashed_name, rr->nsec3.next_hashed_name_size, false); | |
1096 | if (!hash) | |
1097 | return NULL; | |
1098 | ||
1099 | t = format_types(rr->nsec3.types); | |
1100 | if (!t) | |
1101 | return NULL; | |
1102 | ||
1103 | r = asprintf(&s, "%s %"PRIu8" %"PRIu8" %"PRIu16" %s %s %s", | |
1104 | k, | |
1105 | rr->nsec3.algorithm, | |
1106 | rr->nsec3.flags, | |
1107 | rr->nsec3.iterations, | |
1108 | rr->nsec3.salt_size > 0 ? salt : "-", | |
1109 | hash, | |
1110 | t); | |
1111 | if (r < 0) | |
1112 | return NULL; | |
1113 | ||
1114 | break; | |
1115 | } | |
1116 | ||
1117 | case DNS_TYPE_TLSA: { | |
1118 | const char *cert_usage, *selector, *matching_type; | |
1119 | ||
1120 | cert_usage = tlsa_cert_usage_to_string(rr->tlsa.cert_usage); | |
1121 | selector = tlsa_selector_to_string(rr->tlsa.selector); | |
1122 | matching_type = tlsa_matching_type_to_string(rr->tlsa.matching_type); | |
1123 | ||
1124 | t = hexmem(rr->sshfp.fingerprint, rr->sshfp.fingerprint_size); | |
1125 | if (!t) | |
1126 | return NULL; | |
1127 | ||
1128 | r = asprintf(&s, | |
1129 | "%s %u %u %u %s\n" | |
1130 | " -- Cert. usage: %s\n" | |
1131 | " -- Selector: %s\n" | |
1132 | " -- Matching type: %s", | |
1133 | k, | |
1134 | rr->tlsa.cert_usage, | |
1135 | rr->tlsa.selector, | |
1136 | rr->tlsa.matching_type, | |
1137 | t, | |
1138 | cert_usage, | |
1139 | selector, | |
1140 | matching_type); | |
1141 | if (r < 0) | |
1142 | return NULL; | |
1143 | ||
1144 | break; | |
1145 | } | |
1146 | ||
1147 | case DNS_TYPE_CAA: { | |
1148 | _cleanup_free_ char *value; | |
1149 | ||
1150 | value = octescape(rr->caa.value, rr->caa.value_size); | |
1151 | if (!value) | |
1152 | return NULL; | |
1153 | ||
1154 | r = asprintf(&s, "%s %u %s \"%s\"%s%s%s%.0u", | |
1155 | k, | |
1156 | rr->caa.flags, | |
1157 | rr->caa.tag, | |
1158 | value, | |
1159 | rr->caa.flags ? "\n -- Flags:" : "", | |
1160 | rr->caa.flags & CAA_FLAG_CRITICAL ? " critical" : "", | |
1161 | rr->caa.flags & ~CAA_FLAG_CRITICAL ? " " : "", | |
1162 | rr->caa.flags & ~CAA_FLAG_CRITICAL); | |
1163 | if (r < 0) | |
1164 | return NULL; | |
1165 | ||
1166 | break; | |
1167 | } | |
1168 | ||
1169 | case DNS_TYPE_OPENPGPKEY: { | |
1170 | int n; | |
1171 | ||
1172 | r = asprintf(&s, "%s %n", | |
1173 | k, | |
1174 | &n); | |
1175 | if (r < 0) | |
1176 | return NULL; | |
1177 | ||
1178 | r = base64_append(&s, n, | |
1179 | rr->generic.data, rr->generic.data_size, | |
1180 | 8, columns()); | |
1181 | if (r < 0) | |
1182 | return NULL; | |
1183 | break; | |
1184 | } | |
1185 | ||
1186 | default: | |
1187 | t = hexmem(rr->generic.data, rr->generic.data_size); | |
1188 | if (!t) | |
1189 | return NULL; | |
1190 | ||
1191 | /* Format as documented in RFC 3597, Section 5 */ | |
1192 | r = asprintf(&s, "%s \\# %zu %s", k, rr->generic.data_size, t); | |
1193 | if (r < 0) | |
1194 | return NULL; | |
1195 | break; | |
1196 | } | |
1197 | ||
1198 | rr->to_string = s; | |
1199 | return s; | |
1200 | } | |
1201 | ||
1202 | ssize_t dns_resource_record_payload(DnsResourceRecord *rr, void **out) { | |
1203 | assert(rr); | |
1204 | assert(out); | |
1205 | ||
1206 | switch(rr->unparseable ? _DNS_TYPE_INVALID : rr->key->type) { | |
1207 | case DNS_TYPE_SRV: | |
1208 | case DNS_TYPE_PTR: | |
1209 | case DNS_TYPE_NS: | |
1210 | case DNS_TYPE_CNAME: | |
1211 | case DNS_TYPE_DNAME: | |
1212 | case DNS_TYPE_HINFO: | |
1213 | case DNS_TYPE_SPF: | |
1214 | case DNS_TYPE_TXT: | |
1215 | case DNS_TYPE_A: | |
1216 | case DNS_TYPE_AAAA: | |
1217 | case DNS_TYPE_SOA: | |
1218 | case DNS_TYPE_MX: | |
1219 | case DNS_TYPE_LOC: | |
1220 | case DNS_TYPE_DS: | |
1221 | case DNS_TYPE_DNSKEY: | |
1222 | case DNS_TYPE_RRSIG: | |
1223 | case DNS_TYPE_NSEC: | |
1224 | case DNS_TYPE_NSEC3: | |
1225 | return -EINVAL; | |
1226 | ||
1227 | case DNS_TYPE_SSHFP: | |
1228 | *out = rr->sshfp.fingerprint; | |
1229 | return rr->sshfp.fingerprint_size; | |
1230 | ||
1231 | case DNS_TYPE_TLSA: | |
1232 | *out = rr->tlsa.data; | |
1233 | return rr->tlsa.data_size; | |
1234 | ||
1235 | ||
1236 | case DNS_TYPE_OPENPGPKEY: | |
1237 | default: | |
1238 | *out = rr->generic.data; | |
1239 | return rr->generic.data_size; | |
1240 | } | |
1241 | } | |
1242 | ||
1243 | int dns_resource_record_to_wire_format(DnsResourceRecord *rr, bool canonical) { | |
1244 | ||
1245 | DnsPacket packet = { | |
1246 | .n_ref = 1, | |
1247 | .protocol = DNS_PROTOCOL_DNS, | |
1248 | .on_stack = true, | |
1249 | .refuse_compression = true, | |
1250 | .canonical_form = canonical, | |
1251 | }; | |
1252 | ||
1253 | size_t start, rds; | |
1254 | int r; | |
1255 | ||
1256 | assert(rr); | |
1257 | ||
1258 | /* Generates the RR in wire-format, optionally in the | |
1259 | * canonical form as discussed in the DNSSEC RFC 4034, Section | |
1260 | * 6.2. We allocate a throw-away DnsPacket object on the stack | |
1261 | * here, because we need some book-keeping for memory | |
1262 | * management, and can reuse the DnsPacket serializer, that | |
1263 | * can generate the canonical form, too, but also knows label | |
1264 | * compression and suchlike. */ | |
1265 | ||
1266 | if (rr->wire_format && rr->wire_format_canonical == canonical) | |
1267 | return 0; | |
1268 | ||
1269 | r = dns_packet_append_rr(&packet, rr, &start, &rds); | |
1270 | if (r < 0) | |
1271 | return r; | |
1272 | ||
1273 | assert(start == 0); | |
1274 | assert(packet._data); | |
1275 | ||
1276 | free(rr->wire_format); | |
1277 | rr->wire_format = packet._data; | |
1278 | rr->wire_format_size = packet.size; | |
1279 | rr->wire_format_rdata_offset = rds; | |
1280 | rr->wire_format_canonical = canonical; | |
1281 | ||
1282 | packet._data = NULL; | |
1283 | dns_packet_unref(&packet); | |
1284 | ||
1285 | return 0; | |
1286 | } | |
1287 | ||
1288 | int dns_resource_record_signer(DnsResourceRecord *rr, const char **ret) { | |
1289 | const char *n; | |
1290 | int r; | |
1291 | ||
1292 | assert(rr); | |
1293 | assert(ret); | |
1294 | ||
1295 | /* Returns the RRset's signer, if it is known. */ | |
1296 | ||
1297 | if (rr->n_skip_labels_signer == (unsigned) -1) | |
1298 | return -ENODATA; | |
1299 | ||
1300 | n = dns_resource_key_name(rr->key); | |
1301 | r = dns_name_skip(n, rr->n_skip_labels_signer, &n); | |
1302 | if (r < 0) | |
1303 | return r; | |
1304 | if (r == 0) | |
1305 | return -EINVAL; | |
1306 | ||
1307 | *ret = n; | |
1308 | return 0; | |
1309 | } | |
1310 | ||
1311 | int dns_resource_record_source(DnsResourceRecord *rr, const char **ret) { | |
1312 | const char *n; | |
1313 | int r; | |
1314 | ||
1315 | assert(rr); | |
1316 | assert(ret); | |
1317 | ||
1318 | /* Returns the RRset's synthesizing source, if it is known. */ | |
1319 | ||
1320 | if (rr->n_skip_labels_source == (unsigned) -1) | |
1321 | return -ENODATA; | |
1322 | ||
1323 | n = dns_resource_key_name(rr->key); | |
1324 | r = dns_name_skip(n, rr->n_skip_labels_source, &n); | |
1325 | if (r < 0) | |
1326 | return r; | |
1327 | if (r == 0) | |
1328 | return -EINVAL; | |
1329 | ||
1330 | *ret = n; | |
1331 | return 0; | |
1332 | } | |
1333 | ||
1334 | int dns_resource_record_is_signer(DnsResourceRecord *rr, const char *zone) { | |
1335 | const char *signer; | |
1336 | int r; | |
1337 | ||
1338 | assert(rr); | |
1339 | ||
1340 | r = dns_resource_record_signer(rr, &signer); | |
1341 | if (r < 0) | |
1342 | return r; | |
1343 | ||
1344 | return dns_name_equal(zone, signer); | |
1345 | } | |
1346 | ||
1347 | int dns_resource_record_is_synthetic(DnsResourceRecord *rr) { | |
1348 | int r; | |
1349 | ||
1350 | assert(rr); | |
1351 | ||
1352 | /* Returns > 0 if the RR is generated from a wildcard, and is not the asterisk name itself */ | |
1353 | ||
1354 | if (rr->n_skip_labels_source == (unsigned) -1) | |
1355 | return -ENODATA; | |
1356 | ||
1357 | if (rr->n_skip_labels_source == 0) | |
1358 | return 0; | |
1359 | ||
1360 | if (rr->n_skip_labels_source > 1) | |
1361 | return 1; | |
1362 | ||
1363 | r = dns_name_startswith(dns_resource_key_name(rr->key), "*"); | |
1364 | if (r < 0) | |
1365 | return r; | |
1366 | ||
1367 | return !r; | |
1368 | } | |
1369 | ||
1370 | void dns_resource_record_hash_func(const void *i, struct siphash *state) { | |
1371 | const DnsResourceRecord *rr = i; | |
1372 | ||
1373 | assert(rr); | |
1374 | ||
1375 | dns_resource_key_hash_func(rr->key, state); | |
1376 | ||
1377 | switch (rr->unparseable ? _DNS_TYPE_INVALID : rr->key->type) { | |
1378 | ||
1379 | case DNS_TYPE_SRV: | |
1380 | siphash24_compress(&rr->srv.priority, sizeof(rr->srv.priority), state); | |
1381 | siphash24_compress(&rr->srv.weight, sizeof(rr->srv.weight), state); | |
1382 | siphash24_compress(&rr->srv.port, sizeof(rr->srv.port), state); | |
1383 | dns_name_hash_func(rr->srv.name, state); | |
1384 | break; | |
1385 | ||
1386 | case DNS_TYPE_PTR: | |
1387 | case DNS_TYPE_NS: | |
1388 | case DNS_TYPE_CNAME: | |
1389 | case DNS_TYPE_DNAME: | |
1390 | dns_name_hash_func(rr->ptr.name, state); | |
1391 | break; | |
1392 | ||
1393 | case DNS_TYPE_HINFO: | |
1394 | string_hash_func(rr->hinfo.cpu, state); | |
1395 | string_hash_func(rr->hinfo.os, state); | |
1396 | break; | |
1397 | ||
1398 | case DNS_TYPE_TXT: | |
1399 | case DNS_TYPE_SPF: { | |
1400 | DnsTxtItem *j; | |
1401 | ||
1402 | LIST_FOREACH(items, j, rr->txt.items) { | |
1403 | siphash24_compress(j->data, j->length, state); | |
1404 | ||
1405 | /* Add an extra NUL byte, so that "a" followed by "b" doesn't result in the same hash as "ab" | |
1406 | * followed by "". */ | |
1407 | siphash24_compress_byte(0, state); | |
1408 | } | |
1409 | break; | |
1410 | } | |
1411 | ||
1412 | case DNS_TYPE_A: | |
1413 | siphash24_compress(&rr->a.in_addr, sizeof(rr->a.in_addr), state); | |
1414 | break; | |
1415 | ||
1416 | case DNS_TYPE_AAAA: | |
1417 | siphash24_compress(&rr->aaaa.in6_addr, sizeof(rr->aaaa.in6_addr), state); | |
1418 | break; | |
1419 | ||
1420 | case DNS_TYPE_SOA: | |
1421 | dns_name_hash_func(rr->soa.mname, state); | |
1422 | dns_name_hash_func(rr->soa.rname, state); | |
1423 | siphash24_compress(&rr->soa.serial, sizeof(rr->soa.serial), state); | |
1424 | siphash24_compress(&rr->soa.refresh, sizeof(rr->soa.refresh), state); | |
1425 | siphash24_compress(&rr->soa.retry, sizeof(rr->soa.retry), state); | |
1426 | siphash24_compress(&rr->soa.expire, sizeof(rr->soa.expire), state); | |
1427 | siphash24_compress(&rr->soa.minimum, sizeof(rr->soa.minimum), state); | |
1428 | break; | |
1429 | ||
1430 | case DNS_TYPE_MX: | |
1431 | siphash24_compress(&rr->mx.priority, sizeof(rr->mx.priority), state); | |
1432 | dns_name_hash_func(rr->mx.exchange, state); | |
1433 | break; | |
1434 | ||
1435 | case DNS_TYPE_LOC: | |
1436 | siphash24_compress(&rr->loc.version, sizeof(rr->loc.version), state); | |
1437 | siphash24_compress(&rr->loc.size, sizeof(rr->loc.size), state); | |
1438 | siphash24_compress(&rr->loc.horiz_pre, sizeof(rr->loc.horiz_pre), state); | |
1439 | siphash24_compress(&rr->loc.vert_pre, sizeof(rr->loc.vert_pre), state); | |
1440 | siphash24_compress(&rr->loc.latitude, sizeof(rr->loc.latitude), state); | |
1441 | siphash24_compress(&rr->loc.longitude, sizeof(rr->loc.longitude), state); | |
1442 | siphash24_compress(&rr->loc.altitude, sizeof(rr->loc.altitude), state); | |
1443 | break; | |
1444 | ||
1445 | case DNS_TYPE_SSHFP: | |
1446 | siphash24_compress(&rr->sshfp.algorithm, sizeof(rr->sshfp.algorithm), state); | |
1447 | siphash24_compress(&rr->sshfp.fptype, sizeof(rr->sshfp.fptype), state); | |
1448 | siphash24_compress(rr->sshfp.fingerprint, rr->sshfp.fingerprint_size, state); | |
1449 | break; | |
1450 | ||
1451 | case DNS_TYPE_DNSKEY: | |
1452 | siphash24_compress(&rr->dnskey.flags, sizeof(rr->dnskey.flags), state); | |
1453 | siphash24_compress(&rr->dnskey.protocol, sizeof(rr->dnskey.protocol), state); | |
1454 | siphash24_compress(&rr->dnskey.algorithm, sizeof(rr->dnskey.algorithm), state); | |
1455 | siphash24_compress(rr->dnskey.key, rr->dnskey.key_size, state); | |
1456 | break; | |
1457 | ||
1458 | case DNS_TYPE_RRSIG: | |
1459 | siphash24_compress(&rr->rrsig.type_covered, sizeof(rr->rrsig.type_covered), state); | |
1460 | siphash24_compress(&rr->rrsig.algorithm, sizeof(rr->rrsig.algorithm), state); | |
1461 | siphash24_compress(&rr->rrsig.labels, sizeof(rr->rrsig.labels), state); | |
1462 | siphash24_compress(&rr->rrsig.original_ttl, sizeof(rr->rrsig.original_ttl), state); | |
1463 | siphash24_compress(&rr->rrsig.expiration, sizeof(rr->rrsig.expiration), state); | |
1464 | siphash24_compress(&rr->rrsig.inception, sizeof(rr->rrsig.inception), state); | |
1465 | siphash24_compress(&rr->rrsig.key_tag, sizeof(rr->rrsig.key_tag), state); | |
1466 | dns_name_hash_func(rr->rrsig.signer, state); | |
1467 | siphash24_compress(rr->rrsig.signature, rr->rrsig.signature_size, state); | |
1468 | break; | |
1469 | ||
1470 | case DNS_TYPE_NSEC: | |
1471 | dns_name_hash_func(rr->nsec.next_domain_name, state); | |
1472 | /* FIXME: we leave out the type bitmap here. Hash | |
1473 | * would be better if we'd take it into account | |
1474 | * too. */ | |
1475 | break; | |
1476 | ||
1477 | case DNS_TYPE_DS: | |
1478 | siphash24_compress(&rr->ds.key_tag, sizeof(rr->ds.key_tag), state); | |
1479 | siphash24_compress(&rr->ds.algorithm, sizeof(rr->ds.algorithm), state); | |
1480 | siphash24_compress(&rr->ds.digest_type, sizeof(rr->ds.digest_type), state); | |
1481 | siphash24_compress(rr->ds.digest, rr->ds.digest_size, state); | |
1482 | break; | |
1483 | ||
1484 | case DNS_TYPE_NSEC3: | |
1485 | siphash24_compress(&rr->nsec3.algorithm, sizeof(rr->nsec3.algorithm), state); | |
1486 | siphash24_compress(&rr->nsec3.flags, sizeof(rr->nsec3.flags), state); | |
1487 | siphash24_compress(&rr->nsec3.iterations, sizeof(rr->nsec3.iterations), state); | |
1488 | siphash24_compress(rr->nsec3.salt, rr->nsec3.salt_size, state); | |
1489 | siphash24_compress(rr->nsec3.next_hashed_name, rr->nsec3.next_hashed_name_size, state); | |
1490 | /* FIXME: We leave the bitmaps out */ | |
1491 | break; | |
1492 | ||
1493 | case DNS_TYPE_TLSA: | |
1494 | siphash24_compress(&rr->tlsa.cert_usage, sizeof(rr->tlsa.cert_usage), state); | |
1495 | siphash24_compress(&rr->tlsa.selector, sizeof(rr->tlsa.selector), state); | |
1496 | siphash24_compress(&rr->tlsa.matching_type, sizeof(rr->tlsa.matching_type), state); | |
1497 | siphash24_compress(rr->tlsa.data, rr->tlsa.data_size, state); | |
1498 | break; | |
1499 | ||
1500 | case DNS_TYPE_CAA: | |
1501 | siphash24_compress(&rr->caa.flags, sizeof(rr->caa.flags), state); | |
1502 | string_hash_func(rr->caa.tag, state); | |
1503 | siphash24_compress(rr->caa.value, rr->caa.value_size, state); | |
1504 | break; | |
1505 | ||
1506 | case DNS_TYPE_OPENPGPKEY: | |
1507 | default: | |
1508 | siphash24_compress(rr->generic.data, rr->generic.data_size, state); | |
1509 | break; | |
1510 | } | |
1511 | } | |
1512 | ||
1513 | static int dns_resource_record_compare_func(const void *a, const void *b) { | |
1514 | const DnsResourceRecord *x = a, *y = b; | |
1515 | int ret; | |
1516 | ||
1517 | ret = dns_resource_key_compare_func(x->key, y->key); | |
1518 | if (ret != 0) | |
1519 | return ret; | |
1520 | ||
1521 | if (dns_resource_record_equal(x, y)) | |
1522 | return 0; | |
1523 | ||
1524 | /* This is a bit dirty, we don't implement proper ordering, but | |
1525 | * the hashtable doesn't need ordering anyway, hence we don't | |
1526 | * care. */ | |
1527 | return x < y ? -1 : 1; | |
1528 | } | |
1529 | ||
1530 | const struct hash_ops dns_resource_record_hash_ops = { | |
1531 | .hash = dns_resource_record_hash_func, | |
1532 | .compare = dns_resource_record_compare_func, | |
1533 | }; | |
1534 | ||
1535 | DnsTxtItem *dns_txt_item_free_all(DnsTxtItem *i) { | |
1536 | DnsTxtItem *n; | |
1537 | ||
1538 | if (!i) | |
1539 | return NULL; | |
1540 | ||
1541 | n = i->items_next; | |
1542 | ||
1543 | free(i); | |
1544 | return dns_txt_item_free_all(n); | |
1545 | } | |
1546 | ||
1547 | bool dns_txt_item_equal(DnsTxtItem *a, DnsTxtItem *b) { | |
1548 | ||
1549 | if (a == b) | |
1550 | return true; | |
1551 | ||
1552 | if (!a != !b) | |
1553 | return false; | |
1554 | ||
1555 | if (!a) | |
1556 | return true; | |
1557 | ||
1558 | if (a->length != b->length) | |
1559 | return false; | |
1560 | ||
1561 | if (memcmp(a->data, b->data, a->length) != 0) | |
1562 | return false; | |
1563 | ||
1564 | return dns_txt_item_equal(a->items_next, b->items_next); | |
1565 | } | |
1566 | ||
1567 | static const char* const dnssec_algorithm_table[_DNSSEC_ALGORITHM_MAX_DEFINED] = { | |
1568 | /* Mnemonics as listed on https://www.iana.org/assignments/dns-sec-alg-numbers/dns-sec-alg-numbers.xhtml */ | |
1569 | [DNSSEC_ALGORITHM_RSAMD5] = "RSAMD5", | |
1570 | [DNSSEC_ALGORITHM_DH] = "DH", | |
1571 | [DNSSEC_ALGORITHM_DSA] = "DSA", | |
1572 | [DNSSEC_ALGORITHM_ECC] = "ECC", | |
1573 | [DNSSEC_ALGORITHM_RSASHA1] = "RSASHA1", | |
1574 | [DNSSEC_ALGORITHM_DSA_NSEC3_SHA1] = "DSA-NSEC3-SHA1", | |
1575 | [DNSSEC_ALGORITHM_RSASHA1_NSEC3_SHA1] = "RSASHA1-NSEC3-SHA1", | |
1576 | [DNSSEC_ALGORITHM_RSASHA256] = "RSASHA256", | |
1577 | [DNSSEC_ALGORITHM_RSASHA512] = "RSASHA512", | |
1578 | [DNSSEC_ALGORITHM_ECC_GOST] = "ECC-GOST", | |
1579 | [DNSSEC_ALGORITHM_ECDSAP256SHA256] = "ECDSAP256SHA256", | |
1580 | [DNSSEC_ALGORITHM_ECDSAP384SHA384] = "ECDSAP384SHA384", | |
1581 | [DNSSEC_ALGORITHM_INDIRECT] = "INDIRECT", | |
1582 | [DNSSEC_ALGORITHM_PRIVATEDNS] = "PRIVATEDNS", | |
1583 | [DNSSEC_ALGORITHM_PRIVATEOID] = "PRIVATEOID", | |
1584 | }; | |
1585 | DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(dnssec_algorithm, int, 255); | |
1586 | ||
1587 | static const char* const dnssec_digest_table[_DNSSEC_DIGEST_MAX_DEFINED] = { | |
1588 | /* Names as listed on https://www.iana.org/assignments/ds-rr-types/ds-rr-types.xhtml */ | |
1589 | [DNSSEC_DIGEST_SHA1] = "SHA-1", | |
1590 | [DNSSEC_DIGEST_SHA256] = "SHA-256", | |
1591 | [DNSSEC_DIGEST_GOST_R_34_11_94] = "GOST_R_34.11-94", | |
1592 | [DNSSEC_DIGEST_SHA384] = "SHA-384", | |
1593 | }; | |
1594 | DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(dnssec_digest, int, 255); |