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1 | /* SPDX-License-Identifier: LGPL-2.1+ */ | |
2 | ||
3 | #include <math.h> | |
4 | ||
5 | #include "alloc-util.h" | |
6 | #include "dns-domain.h" | |
7 | #include "dns-type.h" | |
8 | #include "escape.h" | |
9 | #include "hexdecoct.h" | |
10 | #include "resolved-dns-dnssec.h" | |
11 | #include "resolved-dns-packet.h" | |
12 | #include "resolved-dns-rr.h" | |
13 | #include "string-table.h" | |
14 | #include "string-util.h" | |
15 | #include "strv.h" | |
16 | #include "terminal-util.h" | |
17 | ||
18 | DnsResourceKey* dns_resource_key_new(uint16_t class, uint16_t type, const char *name) { | |
19 | DnsResourceKey *k; | |
20 | size_t l; | |
21 | ||
22 | assert(name); | |
23 | ||
24 | l = strlen(name); | |
25 | k = malloc0(sizeof(DnsResourceKey) + l + 1); | |
26 | if (!k) | |
27 | return NULL; | |
28 | ||
29 | k->n_ref = 1; | |
30 | k->class = class; | |
31 | k->type = type; | |
32 | ||
33 | strcpy((char*) k + sizeof(DnsResourceKey), name); | |
34 | ||
35 | return k; | |
36 | } | |
37 | ||
38 | DnsResourceKey* dns_resource_key_new_redirect(const DnsResourceKey *key, const DnsResourceRecord *cname) { | |
39 | int r; | |
40 | ||
41 | assert(key); | |
42 | assert(cname); | |
43 | ||
44 | assert(IN_SET(cname->key->type, DNS_TYPE_CNAME, DNS_TYPE_DNAME)); | |
45 | ||
46 | if (cname->key->type == DNS_TYPE_CNAME) | |
47 | return dns_resource_key_new(key->class, key->type, cname->cname.name); | |
48 | else { | |
49 | DnsResourceKey *k; | |
50 | char *destination = NULL; | |
51 | ||
52 | r = dns_name_change_suffix(dns_resource_key_name(key), dns_resource_key_name(cname->key), cname->dname.name, &destination); | |
53 | if (r < 0) | |
54 | return NULL; | |
55 | if (r == 0) | |
56 | return dns_resource_key_ref((DnsResourceKey*) key); | |
57 | ||
58 | k = dns_resource_key_new_consume(key->class, key->type, destination); | |
59 | if (!k) | |
60 | return mfree(destination); | |
61 | ||
62 | return k; | |
63 | } | |
64 | } | |
65 | ||
66 | int dns_resource_key_new_append_suffix(DnsResourceKey **ret, DnsResourceKey *key, char *name) { | |
67 | DnsResourceKey *new_key; | |
68 | char *joined; | |
69 | int r; | |
70 | ||
71 | assert(ret); | |
72 | assert(key); | |
73 | assert(name); | |
74 | ||
75 | if (dns_name_is_root(name)) { | |
76 | *ret = dns_resource_key_ref(key); | |
77 | return 0; | |
78 | } | |
79 | ||
80 | r = dns_name_concat(dns_resource_key_name(key), name, &joined); | |
81 | if (r < 0) | |
82 | return r; | |
83 | ||
84 | new_key = dns_resource_key_new_consume(key->class, key->type, joined); | |
85 | if (!new_key) { | |
86 | free(joined); | |
87 | return -ENOMEM; | |
88 | } | |
89 | ||
90 | *ret = new_key; | |
91 | return 0; | |
92 | } | |
93 | ||
94 | DnsResourceKey* dns_resource_key_new_consume(uint16_t class, uint16_t type, char *name) { | |
95 | DnsResourceKey *k; | |
96 | ||
97 | assert(name); | |
98 | ||
99 | k = new0(DnsResourceKey, 1); | |
100 | if (!k) | |
101 | return NULL; | |
102 | ||
103 | k->n_ref = 1; | |
104 | k->class = class; | |
105 | k->type = type; | |
106 | k->_name = name; | |
107 | ||
108 | return k; | |
109 | } | |
110 | ||
111 | DnsResourceKey* dns_resource_key_ref(DnsResourceKey *k) { | |
112 | ||
113 | if (!k) | |
114 | return NULL; | |
115 | ||
116 | /* Static/const keys created with DNS_RESOURCE_KEY_CONST will | |
117 | * set this to -1, they should not be reffed/unreffed */ | |
118 | assert(k->n_ref != (unsigned) -1); | |
119 | ||
120 | assert(k->n_ref > 0); | |
121 | k->n_ref++; | |
122 | ||
123 | return k; | |
124 | } | |
125 | ||
126 | DnsResourceKey* dns_resource_key_unref(DnsResourceKey *k) { | |
127 | if (!k) | |
128 | return NULL; | |
129 | ||
130 | assert(k->n_ref != (unsigned) -1); | |
131 | assert(k->n_ref > 0); | |
132 | ||
133 | if (k->n_ref == 1) { | |
134 | free(k->_name); | |
135 | free(k); | |
136 | } else | |
137 | k->n_ref--; | |
138 | ||
139 | return NULL; | |
140 | } | |
141 | ||
142 | const char* dns_resource_key_name(const DnsResourceKey *key) { | |
143 | const char *name; | |
144 | ||
145 | if (!key) | |
146 | return NULL; | |
147 | ||
148 | if (key->_name) | |
149 | name = key->_name; | |
150 | else | |
151 | name = (char*) key + sizeof(DnsResourceKey); | |
152 | ||
153 | if (dns_name_is_root(name)) | |
154 | return "."; | |
155 | else | |
156 | return name; | |
157 | } | |
158 | ||
159 | bool dns_resource_key_is_address(const DnsResourceKey *key) { | |
160 | assert(key); | |
161 | ||
162 | /* Check if this is an A or AAAA resource key */ | |
163 | ||
164 | return key->class == DNS_CLASS_IN && IN_SET(key->type, DNS_TYPE_A, DNS_TYPE_AAAA); | |
165 | } | |
166 | ||
167 | bool dns_resource_key_is_dnssd_ptr(const DnsResourceKey *key) { | |
168 | assert(key); | |
169 | ||
170 | /* Check if this is a PTR resource key used in | |
171 | Service Instance Enumeration as described in RFC6763 p4.1. */ | |
172 | ||
173 | if (key->type != DNS_TYPE_PTR) | |
174 | return false; | |
175 | ||
176 | return dns_name_endswith(dns_resource_key_name(key), "_tcp.local") || | |
177 | dns_name_endswith(dns_resource_key_name(key), "_udp.local"); | |
178 | } | |
179 | ||
180 | int dns_resource_key_equal(const DnsResourceKey *a, const DnsResourceKey *b) { | |
181 | int r; | |
182 | ||
183 | if (a == b) | |
184 | return 1; | |
185 | ||
186 | r = dns_name_equal(dns_resource_key_name(a), dns_resource_key_name(b)); | |
187 | if (r <= 0) | |
188 | return r; | |
189 | ||
190 | if (a->class != b->class) | |
191 | return 0; | |
192 | ||
193 | if (a->type != b->type) | |
194 | return 0; | |
195 | ||
196 | return 1; | |
197 | } | |
198 | ||
199 | int dns_resource_key_match_rr(const DnsResourceKey *key, DnsResourceRecord *rr, const char *search_domain) { | |
200 | int r; | |
201 | ||
202 | assert(key); | |
203 | assert(rr); | |
204 | ||
205 | if (key == rr->key) | |
206 | return 1; | |
207 | ||
208 | /* Checks if an rr matches the specified key. If a search | |
209 | * domain is specified, it will also be checked if the key | |
210 | * with the search domain suffixed might match the RR. */ | |
211 | ||
212 | if (rr->key->class != key->class && key->class != DNS_CLASS_ANY) | |
213 | return 0; | |
214 | ||
215 | if (rr->key->type != key->type && key->type != DNS_TYPE_ANY) | |
216 | return 0; | |
217 | ||
218 | r = dns_name_equal(dns_resource_key_name(rr->key), dns_resource_key_name(key)); | |
219 | if (r != 0) | |
220 | return r; | |
221 | ||
222 | if (search_domain) { | |
223 | _cleanup_free_ char *joined = NULL; | |
224 | ||
225 | r = dns_name_concat(dns_resource_key_name(key), search_domain, &joined); | |
226 | if (r < 0) | |
227 | return r; | |
228 | ||
229 | return dns_name_equal(dns_resource_key_name(rr->key), joined); | |
230 | } | |
231 | ||
232 | return 0; | |
233 | } | |
234 | ||
235 | int dns_resource_key_match_cname_or_dname(const DnsResourceKey *key, const DnsResourceKey *cname, const char *search_domain) { | |
236 | int r; | |
237 | ||
238 | assert(key); | |
239 | assert(cname); | |
240 | ||
241 | if (cname->class != key->class && key->class != DNS_CLASS_ANY) | |
242 | return 0; | |
243 | ||
244 | if (cname->type == DNS_TYPE_CNAME) | |
245 | r = dns_name_equal(dns_resource_key_name(key), dns_resource_key_name(cname)); | |
246 | else if (cname->type == DNS_TYPE_DNAME) | |
247 | r = dns_name_endswith(dns_resource_key_name(key), dns_resource_key_name(cname)); | |
248 | else | |
249 | return 0; | |
250 | ||
251 | if (r != 0) | |
252 | return r; | |
253 | ||
254 | if (search_domain) { | |
255 | _cleanup_free_ char *joined = NULL; | |
256 | ||
257 | r = dns_name_concat(dns_resource_key_name(key), search_domain, &joined); | |
258 | if (r < 0) | |
259 | return r; | |
260 | ||
261 | if (cname->type == DNS_TYPE_CNAME) | |
262 | return dns_name_equal(joined, dns_resource_key_name(cname)); | |
263 | else if (cname->type == DNS_TYPE_DNAME) | |
264 | return dns_name_endswith(joined, dns_resource_key_name(cname)); | |
265 | } | |
266 | ||
267 | return 0; | |
268 | } | |
269 | ||
270 | int dns_resource_key_match_soa(const DnsResourceKey *key, const DnsResourceKey *soa) { | |
271 | assert(soa); | |
272 | assert(key); | |
273 | ||
274 | /* Checks whether 'soa' is a SOA record for the specified key. */ | |
275 | ||
276 | if (soa->class != key->class) | |
277 | return 0; | |
278 | ||
279 | if (soa->type != DNS_TYPE_SOA) | |
280 | return 0; | |
281 | ||
282 | return dns_name_endswith(dns_resource_key_name(key), dns_resource_key_name(soa)); | |
283 | } | |
284 | ||
285 | static void dns_resource_key_hash_func(const void *i, struct siphash *state) { | |
286 | const DnsResourceKey *k = i; | |
287 | ||
288 | assert(k); | |
289 | ||
290 | dns_name_hash_func(dns_resource_key_name(k), state); | |
291 | siphash24_compress(&k->class, sizeof(k->class), state); | |
292 | siphash24_compress(&k->type, sizeof(k->type), state); | |
293 | } | |
294 | ||
295 | static int dns_resource_key_compare_func(const void *a, const void *b) { | |
296 | const DnsResourceKey *x = a, *y = b; | |
297 | int ret; | |
298 | ||
299 | ret = dns_name_compare_func(dns_resource_key_name(x), dns_resource_key_name(y)); | |
300 | if (ret != 0) | |
301 | return ret; | |
302 | ||
303 | ret = CMP(x->type, y->type); | |
304 | if (ret != 0) | |
305 | return ret; | |
306 | ||
307 | ret = CMP(x->class, y->class); | |
308 | if (ret != 0) | |
309 | return ret; | |
310 | ||
311 | return 0; | |
312 | } | |
313 | ||
314 | const struct hash_ops dns_resource_key_hash_ops = { | |
315 | .hash = dns_resource_key_hash_func, | |
316 | .compare = dns_resource_key_compare_func | |
317 | }; | |
318 | ||
319 | char* dns_resource_key_to_string(const DnsResourceKey *key, char *buf, size_t buf_size) { | |
320 | const char *c, *t; | |
321 | char *ans = buf; | |
322 | ||
323 | /* If we cannot convert the CLASS/TYPE into a known string, | |
324 | use the format recommended by RFC 3597, Section 5. */ | |
325 | ||
326 | c = dns_class_to_string(key->class); | |
327 | t = dns_type_to_string(key->type); | |
328 | ||
329 | snprintf(buf, buf_size, "%s %s%s%.0u %s%s%.0u", | |
330 | dns_resource_key_name(key), | |
331 | strempty(c), c ? "" : "CLASS", c ? 0 : key->class, | |
332 | strempty(t), t ? "" : "TYPE", t ? 0 : key->type); | |
333 | ||
334 | return ans; | |
335 | } | |
336 | ||
337 | bool dns_resource_key_reduce(DnsResourceKey **a, DnsResourceKey **b) { | |
338 | assert(a); | |
339 | assert(b); | |
340 | ||
341 | /* Try to replace one RR key by another if they are identical, thus saving a bit of memory. Note that we do | |
342 | * this only for RR keys, not for RRs themselves, as they carry a lot of additional metadata (where they come | |
343 | * from, validity data, and suchlike), and cannot be replaced so easily by other RRs that have the same | |
344 | * superficial data. */ | |
345 | ||
346 | if (!*a) | |
347 | return false; | |
348 | if (!*b) | |
349 | return false; | |
350 | ||
351 | /* We refuse merging const keys */ | |
352 | if ((*a)->n_ref == (unsigned) -1) | |
353 | return false; | |
354 | if ((*b)->n_ref == (unsigned) -1) | |
355 | return false; | |
356 | ||
357 | /* Already the same? */ | |
358 | if (*a == *b) | |
359 | return true; | |
360 | ||
361 | /* Are they really identical? */ | |
362 | if (dns_resource_key_equal(*a, *b) <= 0) | |
363 | return false; | |
364 | ||
365 | /* Keep the one which already has more references. */ | |
366 | if ((*a)->n_ref > (*b)->n_ref) { | |
367 | dns_resource_key_unref(*b); | |
368 | *b = dns_resource_key_ref(*a); | |
369 | } else { | |
370 | dns_resource_key_unref(*a); | |
371 | *a = dns_resource_key_ref(*b); | |
372 | } | |
373 | ||
374 | return true; | |
375 | } | |
376 | ||
377 | DnsResourceRecord* dns_resource_record_new(DnsResourceKey *key) { | |
378 | DnsResourceRecord *rr; | |
379 | ||
380 | rr = new0(DnsResourceRecord, 1); | |
381 | if (!rr) | |
382 | return NULL; | |
383 | ||
384 | rr->n_ref = 1; | |
385 | rr->key = dns_resource_key_ref(key); | |
386 | rr->expiry = USEC_INFINITY; | |
387 | rr->n_skip_labels_signer = rr->n_skip_labels_source = (unsigned) -1; | |
388 | ||
389 | return rr; | |
390 | } | |
391 | ||
392 | DnsResourceRecord* dns_resource_record_new_full(uint16_t class, uint16_t type, const char *name) { | |
393 | _cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL; | |
394 | ||
395 | key = dns_resource_key_new(class, type, name); | |
396 | if (!key) | |
397 | return NULL; | |
398 | ||
399 | return dns_resource_record_new(key); | |
400 | } | |
401 | ||
402 | DnsResourceRecord* dns_resource_record_ref(DnsResourceRecord *rr) { | |
403 | if (!rr) | |
404 | return NULL; | |
405 | ||
406 | assert(rr->n_ref > 0); | |
407 | rr->n_ref++; | |
408 | ||
409 | return rr; | |
410 | } | |
411 | ||
412 | DnsResourceRecord* dns_resource_record_unref(DnsResourceRecord *rr) { | |
413 | if (!rr) | |
414 | return NULL; | |
415 | ||
416 | assert(rr->n_ref > 0); | |
417 | ||
418 | if (rr->n_ref > 1) { | |
419 | rr->n_ref--; | |
420 | return NULL; | |
421 | } | |
422 | ||
423 | if (rr->key) { | |
424 | switch(rr->key->type) { | |
425 | ||
426 | case DNS_TYPE_SRV: | |
427 | free(rr->srv.name); | |
428 | break; | |
429 | ||
430 | case DNS_TYPE_PTR: | |
431 | case DNS_TYPE_NS: | |
432 | case DNS_TYPE_CNAME: | |
433 | case DNS_TYPE_DNAME: | |
434 | free(rr->ptr.name); | |
435 | break; | |
436 | ||
437 | case DNS_TYPE_HINFO: | |
438 | free(rr->hinfo.cpu); | |
439 | free(rr->hinfo.os); | |
440 | break; | |
441 | ||
442 | case DNS_TYPE_TXT: | |
443 | case DNS_TYPE_SPF: | |
444 | dns_txt_item_free_all(rr->txt.items); | |
445 | break; | |
446 | ||
447 | case DNS_TYPE_SOA: | |
448 | free(rr->soa.mname); | |
449 | free(rr->soa.rname); | |
450 | break; | |
451 | ||
452 | case DNS_TYPE_MX: | |
453 | free(rr->mx.exchange); | |
454 | break; | |
455 | ||
456 | case DNS_TYPE_DS: | |
457 | free(rr->ds.digest); | |
458 | break; | |
459 | ||
460 | case DNS_TYPE_SSHFP: | |
461 | free(rr->sshfp.fingerprint); | |
462 | break; | |
463 | ||
464 | case DNS_TYPE_DNSKEY: | |
465 | free(rr->dnskey.key); | |
466 | break; | |
467 | ||
468 | case DNS_TYPE_RRSIG: | |
469 | free(rr->rrsig.signer); | |
470 | free(rr->rrsig.signature); | |
471 | break; | |
472 | ||
473 | case DNS_TYPE_NSEC: | |
474 | free(rr->nsec.next_domain_name); | |
475 | bitmap_free(rr->nsec.types); | |
476 | break; | |
477 | ||
478 | case DNS_TYPE_NSEC3: | |
479 | free(rr->nsec3.next_hashed_name); | |
480 | free(rr->nsec3.salt); | |
481 | bitmap_free(rr->nsec3.types); | |
482 | break; | |
483 | ||
484 | case DNS_TYPE_LOC: | |
485 | case DNS_TYPE_A: | |
486 | case DNS_TYPE_AAAA: | |
487 | break; | |
488 | ||
489 | case DNS_TYPE_TLSA: | |
490 | free(rr->tlsa.data); | |
491 | break; | |
492 | ||
493 | case DNS_TYPE_CAA: | |
494 | free(rr->caa.tag); | |
495 | free(rr->caa.value); | |
496 | break; | |
497 | ||
498 | case DNS_TYPE_OPENPGPKEY: | |
499 | default: | |
500 | if (!rr->unparseable) | |
501 | free(rr->generic.data); | |
502 | } | |
503 | ||
504 | if (rr->unparseable) | |
505 | free(rr->generic.data); | |
506 | ||
507 | free(rr->wire_format); | |
508 | dns_resource_key_unref(rr->key); | |
509 | } | |
510 | ||
511 | free(rr->to_string); | |
512 | return mfree(rr); | |
513 | } | |
514 | ||
515 | int dns_resource_record_new_reverse(DnsResourceRecord **ret, int family, const union in_addr_union *address, const char *hostname) { | |
516 | _cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL; | |
517 | _cleanup_(dns_resource_record_unrefp) DnsResourceRecord *rr = NULL; | |
518 | _cleanup_free_ char *ptr = NULL; | |
519 | int r; | |
520 | ||
521 | assert(ret); | |
522 | assert(address); | |
523 | assert(hostname); | |
524 | ||
525 | r = dns_name_reverse(family, address, &ptr); | |
526 | if (r < 0) | |
527 | return r; | |
528 | ||
529 | key = dns_resource_key_new_consume(DNS_CLASS_IN, DNS_TYPE_PTR, ptr); | |
530 | if (!key) | |
531 | return -ENOMEM; | |
532 | ||
533 | ptr = NULL; | |
534 | ||
535 | rr = dns_resource_record_new(key); | |
536 | if (!rr) | |
537 | return -ENOMEM; | |
538 | ||
539 | rr->ptr.name = strdup(hostname); | |
540 | if (!rr->ptr.name) | |
541 | return -ENOMEM; | |
542 | ||
543 | *ret = TAKE_PTR(rr); | |
544 | ||
545 | return 0; | |
546 | } | |
547 | ||
548 | int dns_resource_record_new_address(DnsResourceRecord **ret, int family, const union in_addr_union *address, const char *name) { | |
549 | DnsResourceRecord *rr; | |
550 | ||
551 | assert(ret); | |
552 | assert(address); | |
553 | assert(family); | |
554 | ||
555 | if (family == AF_INET) { | |
556 | ||
557 | rr = dns_resource_record_new_full(DNS_CLASS_IN, DNS_TYPE_A, name); | |
558 | if (!rr) | |
559 | return -ENOMEM; | |
560 | ||
561 | rr->a.in_addr = address->in; | |
562 | ||
563 | } else if (family == AF_INET6) { | |
564 | ||
565 | rr = dns_resource_record_new_full(DNS_CLASS_IN, DNS_TYPE_AAAA, name); | |
566 | if (!rr) | |
567 | return -ENOMEM; | |
568 | ||
569 | rr->aaaa.in6_addr = address->in6; | |
570 | } else | |
571 | return -EAFNOSUPPORT; | |
572 | ||
573 | *ret = rr; | |
574 | ||
575 | return 0; | |
576 | } | |
577 | ||
578 | #define FIELD_EQUAL(a, b, field) \ | |
579 | ((a).field ## _size == (b).field ## _size && \ | |
580 | memcmp((a).field, (b).field, (a).field ## _size) == 0) | |
581 | ||
582 | int dns_resource_record_equal(const DnsResourceRecord *a, const DnsResourceRecord *b) { | |
583 | int r; | |
584 | ||
585 | assert(a); | |
586 | assert(b); | |
587 | ||
588 | if (a == b) | |
589 | return 1; | |
590 | ||
591 | r = dns_resource_key_equal(a->key, b->key); | |
592 | if (r <= 0) | |
593 | return r; | |
594 | ||
595 | if (a->unparseable != b->unparseable) | |
596 | return 0; | |
597 | ||
598 | switch (a->unparseable ? _DNS_TYPE_INVALID : a->key->type) { | |
599 | ||
600 | case DNS_TYPE_SRV: | |
601 | r = dns_name_equal(a->srv.name, b->srv.name); | |
602 | if (r <= 0) | |
603 | return r; | |
604 | ||
605 | return a->srv.priority == b->srv.priority && | |
606 | a->srv.weight == b->srv.weight && | |
607 | a->srv.port == b->srv.port; | |
608 | ||
609 | case DNS_TYPE_PTR: | |
610 | case DNS_TYPE_NS: | |
611 | case DNS_TYPE_CNAME: | |
612 | case DNS_TYPE_DNAME: | |
613 | return dns_name_equal(a->ptr.name, b->ptr.name); | |
614 | ||
615 | case DNS_TYPE_HINFO: | |
616 | return strcaseeq(a->hinfo.cpu, b->hinfo.cpu) && | |
617 | strcaseeq(a->hinfo.os, b->hinfo.os); | |
618 | ||
619 | case DNS_TYPE_SPF: /* exactly the same as TXT */ | |
620 | case DNS_TYPE_TXT: | |
621 | return dns_txt_item_equal(a->txt.items, b->txt.items); | |
622 | ||
623 | case DNS_TYPE_A: | |
624 | return memcmp(&a->a.in_addr, &b->a.in_addr, sizeof(struct in_addr)) == 0; | |
625 | ||
626 | case DNS_TYPE_AAAA: | |
627 | return memcmp(&a->aaaa.in6_addr, &b->aaaa.in6_addr, sizeof(struct in6_addr)) == 0; | |
628 | ||
629 | case DNS_TYPE_SOA: | |
630 | r = dns_name_equal(a->soa.mname, b->soa.mname); | |
631 | if (r <= 0) | |
632 | return r; | |
633 | r = dns_name_equal(a->soa.rname, b->soa.rname); | |
634 | if (r <= 0) | |
635 | return r; | |
636 | ||
637 | return a->soa.serial == b->soa.serial && | |
638 | a->soa.refresh == b->soa.refresh && | |
639 | a->soa.retry == b->soa.retry && | |
640 | a->soa.expire == b->soa.expire && | |
641 | a->soa.minimum == b->soa.minimum; | |
642 | ||
643 | case DNS_TYPE_MX: | |
644 | if (a->mx.priority != b->mx.priority) | |
645 | return 0; | |
646 | ||
647 | return dns_name_equal(a->mx.exchange, b->mx.exchange); | |
648 | ||
649 | case DNS_TYPE_LOC: | |
650 | assert(a->loc.version == b->loc.version); | |
651 | ||
652 | return a->loc.size == b->loc.size && | |
653 | a->loc.horiz_pre == b->loc.horiz_pre && | |
654 | a->loc.vert_pre == b->loc.vert_pre && | |
655 | a->loc.latitude == b->loc.latitude && | |
656 | a->loc.longitude == b->loc.longitude && | |
657 | a->loc.altitude == b->loc.altitude; | |
658 | ||
659 | case DNS_TYPE_DS: | |
660 | return a->ds.key_tag == b->ds.key_tag && | |
661 | a->ds.algorithm == b->ds.algorithm && | |
662 | a->ds.digest_type == b->ds.digest_type && | |
663 | FIELD_EQUAL(a->ds, b->ds, digest); | |
664 | ||
665 | case DNS_TYPE_SSHFP: | |
666 | return a->sshfp.algorithm == b->sshfp.algorithm && | |
667 | a->sshfp.fptype == b->sshfp.fptype && | |
668 | FIELD_EQUAL(a->sshfp, b->sshfp, fingerprint); | |
669 | ||
670 | case DNS_TYPE_DNSKEY: | |
671 | return a->dnskey.flags == b->dnskey.flags && | |
672 | a->dnskey.protocol == b->dnskey.protocol && | |
673 | a->dnskey.algorithm == b->dnskey.algorithm && | |
674 | FIELD_EQUAL(a->dnskey, b->dnskey, key); | |
675 | ||
676 | case DNS_TYPE_RRSIG: | |
677 | /* do the fast comparisons first */ | |
678 | return a->rrsig.type_covered == b->rrsig.type_covered && | |
679 | a->rrsig.algorithm == b->rrsig.algorithm && | |
680 | a->rrsig.labels == b->rrsig.labels && | |
681 | a->rrsig.original_ttl == b->rrsig.original_ttl && | |
682 | a->rrsig.expiration == b->rrsig.expiration && | |
683 | a->rrsig.inception == b->rrsig.inception && | |
684 | a->rrsig.key_tag == b->rrsig.key_tag && | |
685 | FIELD_EQUAL(a->rrsig, b->rrsig, signature) && | |
686 | dns_name_equal(a->rrsig.signer, b->rrsig.signer); | |
687 | ||
688 | case DNS_TYPE_NSEC: | |
689 | return dns_name_equal(a->nsec.next_domain_name, b->nsec.next_domain_name) && | |
690 | bitmap_equal(a->nsec.types, b->nsec.types); | |
691 | ||
692 | case DNS_TYPE_NSEC3: | |
693 | return a->nsec3.algorithm == b->nsec3.algorithm && | |
694 | a->nsec3.flags == b->nsec3.flags && | |
695 | a->nsec3.iterations == b->nsec3.iterations && | |
696 | FIELD_EQUAL(a->nsec3, b->nsec3, salt) && | |
697 | FIELD_EQUAL(a->nsec3, b->nsec3, next_hashed_name) && | |
698 | bitmap_equal(a->nsec3.types, b->nsec3.types); | |
699 | ||
700 | case DNS_TYPE_TLSA: | |
701 | return a->tlsa.cert_usage == b->tlsa.cert_usage && | |
702 | a->tlsa.selector == b->tlsa.selector && | |
703 | a->tlsa.matching_type == b->tlsa.matching_type && | |
704 | FIELD_EQUAL(a->tlsa, b->tlsa, data); | |
705 | ||
706 | case DNS_TYPE_CAA: | |
707 | return a->caa.flags == b->caa.flags && | |
708 | streq(a->caa.tag, b->caa.tag) && | |
709 | FIELD_EQUAL(a->caa, b->caa, value); | |
710 | ||
711 | case DNS_TYPE_OPENPGPKEY: | |
712 | default: | |
713 | return FIELD_EQUAL(a->generic, b->generic, data); | |
714 | } | |
715 | } | |
716 | ||
717 | static char* format_location(uint32_t latitude, uint32_t longitude, uint32_t altitude, | |
718 | uint8_t size, uint8_t horiz_pre, uint8_t vert_pre) { | |
719 | char *s; | |
720 | char NS = latitude >= 1U<<31 ? 'N' : 'S'; | |
721 | char EW = longitude >= 1U<<31 ? 'E' : 'W'; | |
722 | ||
723 | int lat = latitude >= 1U<<31 ? (int) (latitude - (1U<<31)) : (int) ((1U<<31) - latitude); | |
724 | int lon = longitude >= 1U<<31 ? (int) (longitude - (1U<<31)) : (int) ((1U<<31) - longitude); | |
725 | double alt = altitude >= 10000000u ? altitude - 10000000u : -(double)(10000000u - altitude); | |
726 | double siz = (size >> 4) * exp10((double) (size & 0xF)); | |
727 | double hor = (horiz_pre >> 4) * exp10((double) (horiz_pre & 0xF)); | |
728 | double ver = (vert_pre >> 4) * exp10((double) (vert_pre & 0xF)); | |
729 | ||
730 | if (asprintf(&s, "%d %d %.3f %c %d %d %.3f %c %.2fm %.2fm %.2fm %.2fm", | |
731 | (lat / 60000 / 60), | |
732 | (lat / 60000) % 60, | |
733 | (lat % 60000) / 1000., | |
734 | NS, | |
735 | (lon / 60000 / 60), | |
736 | (lon / 60000) % 60, | |
737 | (lon % 60000) / 1000., | |
738 | EW, | |
739 | alt / 100., | |
740 | siz / 100., | |
741 | hor / 100., | |
742 | ver / 100.) < 0) | |
743 | return NULL; | |
744 | ||
745 | return s; | |
746 | } | |
747 | ||
748 | static int format_timestamp_dns(char *buf, size_t l, time_t sec) { | |
749 | struct tm tm; | |
750 | ||
751 | assert(buf); | |
752 | assert(l > STRLEN("YYYYMMDDHHmmSS")); | |
753 | ||
754 | if (!gmtime_r(&sec, &tm)) | |
755 | return -EINVAL; | |
756 | ||
757 | if (strftime(buf, l, "%Y%m%d%H%M%S", &tm) <= 0) | |
758 | return -EINVAL; | |
759 | ||
760 | return 0; | |
761 | } | |
762 | ||
763 | static char *format_types(Bitmap *types) { | |
764 | _cleanup_strv_free_ char **strv = NULL; | |
765 | _cleanup_free_ char *str = NULL; | |
766 | Iterator i; | |
767 | unsigned type; | |
768 | int r; | |
769 | ||
770 | BITMAP_FOREACH(type, types, i) { | |
771 | if (dns_type_to_string(type)) { | |
772 | r = strv_extend(&strv, dns_type_to_string(type)); | |
773 | if (r < 0) | |
774 | return NULL; | |
775 | } else { | |
776 | char *t; | |
777 | ||
778 | r = asprintf(&t, "TYPE%u", type); | |
779 | if (r < 0) | |
780 | return NULL; | |
781 | ||
782 | r = strv_consume(&strv, t); | |
783 | if (r < 0) | |
784 | return NULL; | |
785 | } | |
786 | } | |
787 | ||
788 | str = strv_join(strv, " "); | |
789 | if (!str) | |
790 | return NULL; | |
791 | ||
792 | return strjoin("( ", str, " )"); | |
793 | } | |
794 | ||
795 | static char *format_txt(DnsTxtItem *first) { | |
796 | DnsTxtItem *i; | |
797 | size_t c = 1; | |
798 | char *p, *s; | |
799 | ||
800 | LIST_FOREACH(items, i, first) | |
801 | c += i->length * 4 + 3; | |
802 | ||
803 | p = s = new(char, c); | |
804 | if (!s) | |
805 | return NULL; | |
806 | ||
807 | LIST_FOREACH(items, i, first) { | |
808 | size_t j; | |
809 | ||
810 | if (i != first) | |
811 | *(p++) = ' '; | |
812 | ||
813 | *(p++) = '"'; | |
814 | ||
815 | for (j = 0; j < i->length; j++) { | |
816 | if (i->data[j] < ' ' || i->data[j] == '"' || i->data[j] >= 127) { | |
817 | *(p++) = '\\'; | |
818 | *(p++) = '0' + (i->data[j] / 100); | |
819 | *(p++) = '0' + ((i->data[j] / 10) % 10); | |
820 | *(p++) = '0' + (i->data[j] % 10); | |
821 | } else | |
822 | *(p++) = i->data[j]; | |
823 | } | |
824 | ||
825 | *(p++) = '"'; | |
826 | } | |
827 | ||
828 | *p = 0; | |
829 | return s; | |
830 | } | |
831 | ||
832 | const char *dns_resource_record_to_string(DnsResourceRecord *rr) { | |
833 | _cleanup_free_ char *t = NULL; | |
834 | char *s, k[DNS_RESOURCE_KEY_STRING_MAX]; | |
835 | int r; | |
836 | ||
837 | assert(rr); | |
838 | ||
839 | if (rr->to_string) | |
840 | return rr->to_string; | |
841 | ||
842 | dns_resource_key_to_string(rr->key, k, sizeof(k)); | |
843 | ||
844 | switch (rr->unparseable ? _DNS_TYPE_INVALID : rr->key->type) { | |
845 | ||
846 | case DNS_TYPE_SRV: | |
847 | r = asprintf(&s, "%s %u %u %u %s", | |
848 | k, | |
849 | rr->srv.priority, | |
850 | rr->srv.weight, | |
851 | rr->srv.port, | |
852 | strna(rr->srv.name)); | |
853 | if (r < 0) | |
854 | return NULL; | |
855 | break; | |
856 | ||
857 | case DNS_TYPE_PTR: | |
858 | case DNS_TYPE_NS: | |
859 | case DNS_TYPE_CNAME: | |
860 | case DNS_TYPE_DNAME: | |
861 | s = strjoin(k, " ", rr->ptr.name); | |
862 | if (!s) | |
863 | return NULL; | |
864 | ||
865 | break; | |
866 | ||
867 | case DNS_TYPE_HINFO: | |
868 | s = strjoin(k, " ", rr->hinfo.cpu, " ", rr->hinfo.os); | |
869 | if (!s) | |
870 | return NULL; | |
871 | break; | |
872 | ||
873 | case DNS_TYPE_SPF: /* exactly the same as TXT */ | |
874 | case DNS_TYPE_TXT: | |
875 | t = format_txt(rr->txt.items); | |
876 | if (!t) | |
877 | return NULL; | |
878 | ||
879 | s = strjoin(k, " ", t); | |
880 | if (!s) | |
881 | return NULL; | |
882 | break; | |
883 | ||
884 | case DNS_TYPE_A: { | |
885 | _cleanup_free_ char *x = NULL; | |
886 | ||
887 | r = in_addr_to_string(AF_INET, (const union in_addr_union*) &rr->a.in_addr, &x); | |
888 | if (r < 0) | |
889 | return NULL; | |
890 | ||
891 | s = strjoin(k, " ", x); | |
892 | if (!s) | |
893 | return NULL; | |
894 | break; | |
895 | } | |
896 | ||
897 | case DNS_TYPE_AAAA: | |
898 | r = in_addr_to_string(AF_INET6, (const union in_addr_union*) &rr->aaaa.in6_addr, &t); | |
899 | if (r < 0) | |
900 | return NULL; | |
901 | ||
902 | s = strjoin(k, " ", t); | |
903 | if (!s) | |
904 | return NULL; | |
905 | break; | |
906 | ||
907 | case DNS_TYPE_SOA: | |
908 | r = asprintf(&s, "%s %s %s %u %u %u %u %u", | |
909 | k, | |
910 | strna(rr->soa.mname), | |
911 | strna(rr->soa.rname), | |
912 | rr->soa.serial, | |
913 | rr->soa.refresh, | |
914 | rr->soa.retry, | |
915 | rr->soa.expire, | |
916 | rr->soa.minimum); | |
917 | if (r < 0) | |
918 | return NULL; | |
919 | break; | |
920 | ||
921 | case DNS_TYPE_MX: | |
922 | r = asprintf(&s, "%s %u %s", | |
923 | k, | |
924 | rr->mx.priority, | |
925 | rr->mx.exchange); | |
926 | if (r < 0) | |
927 | return NULL; | |
928 | break; | |
929 | ||
930 | case DNS_TYPE_LOC: | |
931 | assert(rr->loc.version == 0); | |
932 | ||
933 | t = format_location(rr->loc.latitude, | |
934 | rr->loc.longitude, | |
935 | rr->loc.altitude, | |
936 | rr->loc.size, | |
937 | rr->loc.horiz_pre, | |
938 | rr->loc.vert_pre); | |
939 | if (!t) | |
940 | return NULL; | |
941 | ||
942 | s = strjoin(k, " ", t); | |
943 | if (!s) | |
944 | return NULL; | |
945 | break; | |
946 | ||
947 | case DNS_TYPE_DS: | |
948 | t = hexmem(rr->ds.digest, rr->ds.digest_size); | |
949 | if (!t) | |
950 | return NULL; | |
951 | ||
952 | r = asprintf(&s, "%s %u %u %u %s", | |
953 | k, | |
954 | rr->ds.key_tag, | |
955 | rr->ds.algorithm, | |
956 | rr->ds.digest_type, | |
957 | t); | |
958 | if (r < 0) | |
959 | return NULL; | |
960 | break; | |
961 | ||
962 | case DNS_TYPE_SSHFP: | |
963 | t = hexmem(rr->sshfp.fingerprint, rr->sshfp.fingerprint_size); | |
964 | if (!t) | |
965 | return NULL; | |
966 | ||
967 | r = asprintf(&s, "%s %u %u %s", | |
968 | k, | |
969 | rr->sshfp.algorithm, | |
970 | rr->sshfp.fptype, | |
971 | t); | |
972 | if (r < 0) | |
973 | return NULL; | |
974 | break; | |
975 | ||
976 | case DNS_TYPE_DNSKEY: { | |
977 | _cleanup_free_ char *alg = NULL; | |
978 | char *ss; | |
979 | int n; | |
980 | uint16_t key_tag; | |
981 | ||
982 | key_tag = dnssec_keytag(rr, true); | |
983 | ||
984 | r = dnssec_algorithm_to_string_alloc(rr->dnskey.algorithm, &alg); | |
985 | if (r < 0) | |
986 | return NULL; | |
987 | ||
988 | r = asprintf(&s, "%s %u %u %s %n", | |
989 | k, | |
990 | rr->dnskey.flags, | |
991 | rr->dnskey.protocol, | |
992 | alg, | |
993 | &n); | |
994 | if (r < 0) | |
995 | return NULL; | |
996 | ||
997 | r = base64_append(&s, n, | |
998 | rr->dnskey.key, rr->dnskey.key_size, | |
999 | 8, columns()); | |
1000 | if (r < 0) | |
1001 | return NULL; | |
1002 | ||
1003 | r = asprintf(&ss, "%s\n" | |
1004 | " -- Flags:%s%s%s\n" | |
1005 | " -- Key tag: %u", | |
1006 | s, | |
1007 | rr->dnskey.flags & DNSKEY_FLAG_SEP ? " SEP" : "", | |
1008 | rr->dnskey.flags & DNSKEY_FLAG_REVOKE ? " REVOKE" : "", | |
1009 | rr->dnskey.flags & DNSKEY_FLAG_ZONE_KEY ? " ZONE_KEY" : "", | |
1010 | key_tag); | |
1011 | if (r < 0) | |
1012 | return NULL; | |
1013 | free(s); | |
1014 | s = ss; | |
1015 | ||
1016 | break; | |
1017 | } | |
1018 | ||
1019 | case DNS_TYPE_RRSIG: { | |
1020 | _cleanup_free_ char *alg = NULL; | |
1021 | char expiration[STRLEN("YYYYMMDDHHmmSS") + 1], inception[STRLEN("YYYYMMDDHHmmSS") + 1]; | |
1022 | const char *type; | |
1023 | int n; | |
1024 | ||
1025 | type = dns_type_to_string(rr->rrsig.type_covered); | |
1026 | ||
1027 | r = dnssec_algorithm_to_string_alloc(rr->rrsig.algorithm, &alg); | |
1028 | if (r < 0) | |
1029 | return NULL; | |
1030 | ||
1031 | r = format_timestamp_dns(expiration, sizeof(expiration), rr->rrsig.expiration); | |
1032 | if (r < 0) | |
1033 | return NULL; | |
1034 | ||
1035 | r = format_timestamp_dns(inception, sizeof(inception), rr->rrsig.inception); | |
1036 | if (r < 0) | |
1037 | return NULL; | |
1038 | ||
1039 | /* TYPE?? follows | |
1040 | * http://tools.ietf.org/html/rfc3597#section-5 */ | |
1041 | ||
1042 | r = asprintf(&s, "%s %s%.*u %s %u %u %s %s %u %s %n", | |
1043 | k, | |
1044 | type ?: "TYPE", | |
1045 | type ? 0 : 1, type ? 0u : (unsigned) rr->rrsig.type_covered, | |
1046 | alg, | |
1047 | rr->rrsig.labels, | |
1048 | rr->rrsig.original_ttl, | |
1049 | expiration, | |
1050 | inception, | |
1051 | rr->rrsig.key_tag, | |
1052 | rr->rrsig.signer, | |
1053 | &n); | |
1054 | if (r < 0) | |
1055 | return NULL; | |
1056 | ||
1057 | r = base64_append(&s, n, | |
1058 | rr->rrsig.signature, rr->rrsig.signature_size, | |
1059 | 8, columns()); | |
1060 | if (r < 0) | |
1061 | return NULL; | |
1062 | ||
1063 | break; | |
1064 | } | |
1065 | ||
1066 | case DNS_TYPE_NSEC: | |
1067 | t = format_types(rr->nsec.types); | |
1068 | if (!t) | |
1069 | return NULL; | |
1070 | ||
1071 | r = asprintf(&s, "%s %s %s", | |
1072 | k, | |
1073 | rr->nsec.next_domain_name, | |
1074 | t); | |
1075 | if (r < 0) | |
1076 | return NULL; | |
1077 | break; | |
1078 | ||
1079 | case DNS_TYPE_NSEC3: { | |
1080 | _cleanup_free_ char *salt = NULL, *hash = NULL; | |
1081 | ||
1082 | if (rr->nsec3.salt_size > 0) { | |
1083 | salt = hexmem(rr->nsec3.salt, rr->nsec3.salt_size); | |
1084 | if (!salt) | |
1085 | return NULL; | |
1086 | } | |
1087 | ||
1088 | hash = base32hexmem(rr->nsec3.next_hashed_name, rr->nsec3.next_hashed_name_size, false); | |
1089 | if (!hash) | |
1090 | return NULL; | |
1091 | ||
1092 | t = format_types(rr->nsec3.types); | |
1093 | if (!t) | |
1094 | return NULL; | |
1095 | ||
1096 | r = asprintf(&s, "%s %"PRIu8" %"PRIu8" %"PRIu16" %s %s %s", | |
1097 | k, | |
1098 | rr->nsec3.algorithm, | |
1099 | rr->nsec3.flags, | |
1100 | rr->nsec3.iterations, | |
1101 | rr->nsec3.salt_size > 0 ? salt : "-", | |
1102 | hash, | |
1103 | t); | |
1104 | if (r < 0) | |
1105 | return NULL; | |
1106 | ||
1107 | break; | |
1108 | } | |
1109 | ||
1110 | case DNS_TYPE_TLSA: { | |
1111 | const char *cert_usage, *selector, *matching_type; | |
1112 | ||
1113 | cert_usage = tlsa_cert_usage_to_string(rr->tlsa.cert_usage); | |
1114 | selector = tlsa_selector_to_string(rr->tlsa.selector); | |
1115 | matching_type = tlsa_matching_type_to_string(rr->tlsa.matching_type); | |
1116 | ||
1117 | t = hexmem(rr->sshfp.fingerprint, rr->sshfp.fingerprint_size); | |
1118 | if (!t) | |
1119 | return NULL; | |
1120 | ||
1121 | r = asprintf(&s, | |
1122 | "%s %u %u %u %s\n" | |
1123 | " -- Cert. usage: %s\n" | |
1124 | " -- Selector: %s\n" | |
1125 | " -- Matching type: %s", | |
1126 | k, | |
1127 | rr->tlsa.cert_usage, | |
1128 | rr->tlsa.selector, | |
1129 | rr->tlsa.matching_type, | |
1130 | t, | |
1131 | cert_usage, | |
1132 | selector, | |
1133 | matching_type); | |
1134 | if (r < 0) | |
1135 | return NULL; | |
1136 | ||
1137 | break; | |
1138 | } | |
1139 | ||
1140 | case DNS_TYPE_CAA: { | |
1141 | _cleanup_free_ char *value; | |
1142 | ||
1143 | value = octescape(rr->caa.value, rr->caa.value_size); | |
1144 | if (!value) | |
1145 | return NULL; | |
1146 | ||
1147 | r = asprintf(&s, "%s %u %s \"%s\"%s%s%s%.0u", | |
1148 | k, | |
1149 | rr->caa.flags, | |
1150 | rr->caa.tag, | |
1151 | value, | |
1152 | rr->caa.flags ? "\n -- Flags:" : "", | |
1153 | rr->caa.flags & CAA_FLAG_CRITICAL ? " critical" : "", | |
1154 | rr->caa.flags & ~CAA_FLAG_CRITICAL ? " " : "", | |
1155 | rr->caa.flags & ~CAA_FLAG_CRITICAL); | |
1156 | if (r < 0) | |
1157 | return NULL; | |
1158 | ||
1159 | break; | |
1160 | } | |
1161 | ||
1162 | case DNS_TYPE_OPENPGPKEY: { | |
1163 | int n; | |
1164 | ||
1165 | r = asprintf(&s, "%s %n", | |
1166 | k, | |
1167 | &n); | |
1168 | if (r < 0) | |
1169 | return NULL; | |
1170 | ||
1171 | r = base64_append(&s, n, | |
1172 | rr->generic.data, rr->generic.data_size, | |
1173 | 8, columns()); | |
1174 | if (r < 0) | |
1175 | return NULL; | |
1176 | break; | |
1177 | } | |
1178 | ||
1179 | default: | |
1180 | t = hexmem(rr->generic.data, rr->generic.data_size); | |
1181 | if (!t) | |
1182 | return NULL; | |
1183 | ||
1184 | /* Format as documented in RFC 3597, Section 5 */ | |
1185 | r = asprintf(&s, "%s \\# %zu %s", k, rr->generic.data_size, t); | |
1186 | if (r < 0) | |
1187 | return NULL; | |
1188 | break; | |
1189 | } | |
1190 | ||
1191 | rr->to_string = s; | |
1192 | return s; | |
1193 | } | |
1194 | ||
1195 | ssize_t dns_resource_record_payload(DnsResourceRecord *rr, void **out) { | |
1196 | assert(rr); | |
1197 | assert(out); | |
1198 | ||
1199 | switch(rr->unparseable ? _DNS_TYPE_INVALID : rr->key->type) { | |
1200 | case DNS_TYPE_SRV: | |
1201 | case DNS_TYPE_PTR: | |
1202 | case DNS_TYPE_NS: | |
1203 | case DNS_TYPE_CNAME: | |
1204 | case DNS_TYPE_DNAME: | |
1205 | case DNS_TYPE_HINFO: | |
1206 | case DNS_TYPE_SPF: | |
1207 | case DNS_TYPE_TXT: | |
1208 | case DNS_TYPE_A: | |
1209 | case DNS_TYPE_AAAA: | |
1210 | case DNS_TYPE_SOA: | |
1211 | case DNS_TYPE_MX: | |
1212 | case DNS_TYPE_LOC: | |
1213 | case DNS_TYPE_DS: | |
1214 | case DNS_TYPE_DNSKEY: | |
1215 | case DNS_TYPE_RRSIG: | |
1216 | case DNS_TYPE_NSEC: | |
1217 | case DNS_TYPE_NSEC3: | |
1218 | return -EINVAL; | |
1219 | ||
1220 | case DNS_TYPE_SSHFP: | |
1221 | *out = rr->sshfp.fingerprint; | |
1222 | return rr->sshfp.fingerprint_size; | |
1223 | ||
1224 | case DNS_TYPE_TLSA: | |
1225 | *out = rr->tlsa.data; | |
1226 | return rr->tlsa.data_size; | |
1227 | ||
1228 | case DNS_TYPE_OPENPGPKEY: | |
1229 | default: | |
1230 | *out = rr->generic.data; | |
1231 | return rr->generic.data_size; | |
1232 | } | |
1233 | } | |
1234 | ||
1235 | int dns_resource_record_to_wire_format(DnsResourceRecord *rr, bool canonical) { | |
1236 | ||
1237 | DnsPacket packet = { | |
1238 | .n_ref = 1, | |
1239 | .protocol = DNS_PROTOCOL_DNS, | |
1240 | .on_stack = true, | |
1241 | .refuse_compression = true, | |
1242 | .canonical_form = canonical, | |
1243 | }; | |
1244 | ||
1245 | size_t start, rds; | |
1246 | int r; | |
1247 | ||
1248 | assert(rr); | |
1249 | ||
1250 | /* Generates the RR in wire-format, optionally in the | |
1251 | * canonical form as discussed in the DNSSEC RFC 4034, Section | |
1252 | * 6.2. We allocate a throw-away DnsPacket object on the stack | |
1253 | * here, because we need some book-keeping for memory | |
1254 | * management, and can reuse the DnsPacket serializer, that | |
1255 | * can generate the canonical form, too, but also knows label | |
1256 | * compression and suchlike. */ | |
1257 | ||
1258 | if (rr->wire_format && rr->wire_format_canonical == canonical) | |
1259 | return 0; | |
1260 | ||
1261 | r = dns_packet_append_rr(&packet, rr, 0, &start, &rds); | |
1262 | if (r < 0) | |
1263 | return r; | |
1264 | ||
1265 | assert(start == 0); | |
1266 | assert(packet._data); | |
1267 | ||
1268 | free(rr->wire_format); | |
1269 | rr->wire_format = packet._data; | |
1270 | rr->wire_format_size = packet.size; | |
1271 | rr->wire_format_rdata_offset = rds; | |
1272 | rr->wire_format_canonical = canonical; | |
1273 | ||
1274 | packet._data = NULL; | |
1275 | dns_packet_unref(&packet); | |
1276 | ||
1277 | return 0; | |
1278 | } | |
1279 | ||
1280 | int dns_resource_record_signer(DnsResourceRecord *rr, const char **ret) { | |
1281 | const char *n; | |
1282 | int r; | |
1283 | ||
1284 | assert(rr); | |
1285 | assert(ret); | |
1286 | ||
1287 | /* Returns the RRset's signer, if it is known. */ | |
1288 | ||
1289 | if (rr->n_skip_labels_signer == (unsigned) -1) | |
1290 | return -ENODATA; | |
1291 | ||
1292 | n = dns_resource_key_name(rr->key); | |
1293 | r = dns_name_skip(n, rr->n_skip_labels_signer, &n); | |
1294 | if (r < 0) | |
1295 | return r; | |
1296 | if (r == 0) | |
1297 | return -EINVAL; | |
1298 | ||
1299 | *ret = n; | |
1300 | return 0; | |
1301 | } | |
1302 | ||
1303 | int dns_resource_record_source(DnsResourceRecord *rr, const char **ret) { | |
1304 | const char *n; | |
1305 | int r; | |
1306 | ||
1307 | assert(rr); | |
1308 | assert(ret); | |
1309 | ||
1310 | /* Returns the RRset's synthesizing source, if it is known. */ | |
1311 | ||
1312 | if (rr->n_skip_labels_source == (unsigned) -1) | |
1313 | return -ENODATA; | |
1314 | ||
1315 | n = dns_resource_key_name(rr->key); | |
1316 | r = dns_name_skip(n, rr->n_skip_labels_source, &n); | |
1317 | if (r < 0) | |
1318 | return r; | |
1319 | if (r == 0) | |
1320 | return -EINVAL; | |
1321 | ||
1322 | *ret = n; | |
1323 | return 0; | |
1324 | } | |
1325 | ||
1326 | int dns_resource_record_is_signer(DnsResourceRecord *rr, const char *zone) { | |
1327 | const char *signer; | |
1328 | int r; | |
1329 | ||
1330 | assert(rr); | |
1331 | ||
1332 | r = dns_resource_record_signer(rr, &signer); | |
1333 | if (r < 0) | |
1334 | return r; | |
1335 | ||
1336 | return dns_name_equal(zone, signer); | |
1337 | } | |
1338 | ||
1339 | int dns_resource_record_is_synthetic(DnsResourceRecord *rr) { | |
1340 | int r; | |
1341 | ||
1342 | assert(rr); | |
1343 | ||
1344 | /* Returns > 0 if the RR is generated from a wildcard, and is not the asterisk name itself */ | |
1345 | ||
1346 | if (rr->n_skip_labels_source == (unsigned) -1) | |
1347 | return -ENODATA; | |
1348 | ||
1349 | if (rr->n_skip_labels_source == 0) | |
1350 | return 0; | |
1351 | ||
1352 | if (rr->n_skip_labels_source > 1) | |
1353 | return 1; | |
1354 | ||
1355 | r = dns_name_startswith(dns_resource_key_name(rr->key), "*"); | |
1356 | if (r < 0) | |
1357 | return r; | |
1358 | ||
1359 | return !r; | |
1360 | } | |
1361 | ||
1362 | void dns_resource_record_hash_func(const void *i, struct siphash *state) { | |
1363 | const DnsResourceRecord *rr = i; | |
1364 | ||
1365 | assert(rr); | |
1366 | ||
1367 | dns_resource_key_hash_func(rr->key, state); | |
1368 | ||
1369 | switch (rr->unparseable ? _DNS_TYPE_INVALID : rr->key->type) { | |
1370 | ||
1371 | case DNS_TYPE_SRV: | |
1372 | siphash24_compress(&rr->srv.priority, sizeof(rr->srv.priority), state); | |
1373 | siphash24_compress(&rr->srv.weight, sizeof(rr->srv.weight), state); | |
1374 | siphash24_compress(&rr->srv.port, sizeof(rr->srv.port), state); | |
1375 | dns_name_hash_func(rr->srv.name, state); | |
1376 | break; | |
1377 | ||
1378 | case DNS_TYPE_PTR: | |
1379 | case DNS_TYPE_NS: | |
1380 | case DNS_TYPE_CNAME: | |
1381 | case DNS_TYPE_DNAME: | |
1382 | dns_name_hash_func(rr->ptr.name, state); | |
1383 | break; | |
1384 | ||
1385 | case DNS_TYPE_HINFO: | |
1386 | string_hash_func(rr->hinfo.cpu, state); | |
1387 | string_hash_func(rr->hinfo.os, state); | |
1388 | break; | |
1389 | ||
1390 | case DNS_TYPE_TXT: | |
1391 | case DNS_TYPE_SPF: { | |
1392 | DnsTxtItem *j; | |
1393 | ||
1394 | LIST_FOREACH(items, j, rr->txt.items) { | |
1395 | siphash24_compress(j->data, j->length, state); | |
1396 | ||
1397 | /* Add an extra NUL byte, so that "a" followed by "b" doesn't result in the same hash as "ab" | |
1398 | * followed by "". */ | |
1399 | siphash24_compress_byte(0, state); | |
1400 | } | |
1401 | break; | |
1402 | } | |
1403 | ||
1404 | case DNS_TYPE_A: | |
1405 | siphash24_compress(&rr->a.in_addr, sizeof(rr->a.in_addr), state); | |
1406 | break; | |
1407 | ||
1408 | case DNS_TYPE_AAAA: | |
1409 | siphash24_compress(&rr->aaaa.in6_addr, sizeof(rr->aaaa.in6_addr), state); | |
1410 | break; | |
1411 | ||
1412 | case DNS_TYPE_SOA: | |
1413 | dns_name_hash_func(rr->soa.mname, state); | |
1414 | dns_name_hash_func(rr->soa.rname, state); | |
1415 | siphash24_compress(&rr->soa.serial, sizeof(rr->soa.serial), state); | |
1416 | siphash24_compress(&rr->soa.refresh, sizeof(rr->soa.refresh), state); | |
1417 | siphash24_compress(&rr->soa.retry, sizeof(rr->soa.retry), state); | |
1418 | siphash24_compress(&rr->soa.expire, sizeof(rr->soa.expire), state); | |
1419 | siphash24_compress(&rr->soa.minimum, sizeof(rr->soa.minimum), state); | |
1420 | break; | |
1421 | ||
1422 | case DNS_TYPE_MX: | |
1423 | siphash24_compress(&rr->mx.priority, sizeof(rr->mx.priority), state); | |
1424 | dns_name_hash_func(rr->mx.exchange, state); | |
1425 | break; | |
1426 | ||
1427 | case DNS_TYPE_LOC: | |
1428 | siphash24_compress(&rr->loc.version, sizeof(rr->loc.version), state); | |
1429 | siphash24_compress(&rr->loc.size, sizeof(rr->loc.size), state); | |
1430 | siphash24_compress(&rr->loc.horiz_pre, sizeof(rr->loc.horiz_pre), state); | |
1431 | siphash24_compress(&rr->loc.vert_pre, sizeof(rr->loc.vert_pre), state); | |
1432 | siphash24_compress(&rr->loc.latitude, sizeof(rr->loc.latitude), state); | |
1433 | siphash24_compress(&rr->loc.longitude, sizeof(rr->loc.longitude), state); | |
1434 | siphash24_compress(&rr->loc.altitude, sizeof(rr->loc.altitude), state); | |
1435 | break; | |
1436 | ||
1437 | case DNS_TYPE_SSHFP: | |
1438 | siphash24_compress(&rr->sshfp.algorithm, sizeof(rr->sshfp.algorithm), state); | |
1439 | siphash24_compress(&rr->sshfp.fptype, sizeof(rr->sshfp.fptype), state); | |
1440 | siphash24_compress(rr->sshfp.fingerprint, rr->sshfp.fingerprint_size, state); | |
1441 | break; | |
1442 | ||
1443 | case DNS_TYPE_DNSKEY: | |
1444 | siphash24_compress(&rr->dnskey.flags, sizeof(rr->dnskey.flags), state); | |
1445 | siphash24_compress(&rr->dnskey.protocol, sizeof(rr->dnskey.protocol), state); | |
1446 | siphash24_compress(&rr->dnskey.algorithm, sizeof(rr->dnskey.algorithm), state); | |
1447 | siphash24_compress(rr->dnskey.key, rr->dnskey.key_size, state); | |
1448 | break; | |
1449 | ||
1450 | case DNS_TYPE_RRSIG: | |
1451 | siphash24_compress(&rr->rrsig.type_covered, sizeof(rr->rrsig.type_covered), state); | |
1452 | siphash24_compress(&rr->rrsig.algorithm, sizeof(rr->rrsig.algorithm), state); | |
1453 | siphash24_compress(&rr->rrsig.labels, sizeof(rr->rrsig.labels), state); | |
1454 | siphash24_compress(&rr->rrsig.original_ttl, sizeof(rr->rrsig.original_ttl), state); | |
1455 | siphash24_compress(&rr->rrsig.expiration, sizeof(rr->rrsig.expiration), state); | |
1456 | siphash24_compress(&rr->rrsig.inception, sizeof(rr->rrsig.inception), state); | |
1457 | siphash24_compress(&rr->rrsig.key_tag, sizeof(rr->rrsig.key_tag), state); | |
1458 | dns_name_hash_func(rr->rrsig.signer, state); | |
1459 | siphash24_compress(rr->rrsig.signature, rr->rrsig.signature_size, state); | |
1460 | break; | |
1461 | ||
1462 | case DNS_TYPE_NSEC: | |
1463 | dns_name_hash_func(rr->nsec.next_domain_name, state); | |
1464 | /* FIXME: we leave out the type bitmap here. Hash | |
1465 | * would be better if we'd take it into account | |
1466 | * too. */ | |
1467 | break; | |
1468 | ||
1469 | case DNS_TYPE_DS: | |
1470 | siphash24_compress(&rr->ds.key_tag, sizeof(rr->ds.key_tag), state); | |
1471 | siphash24_compress(&rr->ds.algorithm, sizeof(rr->ds.algorithm), state); | |
1472 | siphash24_compress(&rr->ds.digest_type, sizeof(rr->ds.digest_type), state); | |
1473 | siphash24_compress(rr->ds.digest, rr->ds.digest_size, state); | |
1474 | break; | |
1475 | ||
1476 | case DNS_TYPE_NSEC3: | |
1477 | siphash24_compress(&rr->nsec3.algorithm, sizeof(rr->nsec3.algorithm), state); | |
1478 | siphash24_compress(&rr->nsec3.flags, sizeof(rr->nsec3.flags), state); | |
1479 | siphash24_compress(&rr->nsec3.iterations, sizeof(rr->nsec3.iterations), state); | |
1480 | siphash24_compress(rr->nsec3.salt, rr->nsec3.salt_size, state); | |
1481 | siphash24_compress(rr->nsec3.next_hashed_name, rr->nsec3.next_hashed_name_size, state); | |
1482 | /* FIXME: We leave the bitmaps out */ | |
1483 | break; | |
1484 | ||
1485 | case DNS_TYPE_TLSA: | |
1486 | siphash24_compress(&rr->tlsa.cert_usage, sizeof(rr->tlsa.cert_usage), state); | |
1487 | siphash24_compress(&rr->tlsa.selector, sizeof(rr->tlsa.selector), state); | |
1488 | siphash24_compress(&rr->tlsa.matching_type, sizeof(rr->tlsa.matching_type), state); | |
1489 | siphash24_compress(rr->tlsa.data, rr->tlsa.data_size, state); | |
1490 | break; | |
1491 | ||
1492 | case DNS_TYPE_CAA: | |
1493 | siphash24_compress(&rr->caa.flags, sizeof(rr->caa.flags), state); | |
1494 | string_hash_func(rr->caa.tag, state); | |
1495 | siphash24_compress(rr->caa.value, rr->caa.value_size, state); | |
1496 | break; | |
1497 | ||
1498 | case DNS_TYPE_OPENPGPKEY: | |
1499 | default: | |
1500 | siphash24_compress(rr->generic.data, rr->generic.data_size, state); | |
1501 | break; | |
1502 | } | |
1503 | } | |
1504 | ||
1505 | static int dns_resource_record_compare_func(const void *a, const void *b) { | |
1506 | const DnsResourceRecord *x = a, *y = b; | |
1507 | int ret; | |
1508 | ||
1509 | ret = dns_resource_key_compare_func(x->key, y->key); | |
1510 | if (ret != 0) | |
1511 | return ret; | |
1512 | ||
1513 | if (dns_resource_record_equal(x, y)) | |
1514 | return 0; | |
1515 | ||
1516 | /* We still use CMP() here, even though don't implement proper | |
1517 | * ordering, since the hashtable doesn't need ordering anyway. */ | |
1518 | return CMP(x, y); | |
1519 | } | |
1520 | ||
1521 | const struct hash_ops dns_resource_record_hash_ops = { | |
1522 | .hash = dns_resource_record_hash_func, | |
1523 | .compare = dns_resource_record_compare_func, | |
1524 | }; | |
1525 | ||
1526 | DnsResourceRecord *dns_resource_record_copy(DnsResourceRecord *rr) { | |
1527 | _cleanup_(dns_resource_record_unrefp) DnsResourceRecord *copy = NULL; | |
1528 | DnsResourceRecord *t; | |
1529 | ||
1530 | assert(rr); | |
1531 | ||
1532 | copy = dns_resource_record_new(rr->key); | |
1533 | if (!copy) | |
1534 | return NULL; | |
1535 | ||
1536 | copy->ttl = rr->ttl; | |
1537 | copy->expiry = rr->expiry; | |
1538 | copy->n_skip_labels_signer = rr->n_skip_labels_signer; | |
1539 | copy->n_skip_labels_source = rr->n_skip_labels_source; | |
1540 | copy->unparseable = rr->unparseable; | |
1541 | ||
1542 | switch (rr->unparseable ? _DNS_TYPE_INVALID : rr->key->type) { | |
1543 | ||
1544 | case DNS_TYPE_SRV: | |
1545 | copy->srv.priority = rr->srv.priority; | |
1546 | copy->srv.weight = rr->srv.weight; | |
1547 | copy->srv.port = rr->srv.port; | |
1548 | copy->srv.name = strdup(rr->srv.name); | |
1549 | if (!copy->srv.name) | |
1550 | return NULL; | |
1551 | break; | |
1552 | ||
1553 | case DNS_TYPE_PTR: | |
1554 | case DNS_TYPE_NS: | |
1555 | case DNS_TYPE_CNAME: | |
1556 | case DNS_TYPE_DNAME: | |
1557 | copy->ptr.name = strdup(rr->ptr.name); | |
1558 | if (!copy->ptr.name) | |
1559 | return NULL; | |
1560 | break; | |
1561 | ||
1562 | case DNS_TYPE_HINFO: | |
1563 | copy->hinfo.cpu = strdup(rr->hinfo.cpu); | |
1564 | if (!copy->hinfo.cpu) | |
1565 | return NULL; | |
1566 | ||
1567 | copy->hinfo.os = strdup(rr->hinfo.os); | |
1568 | if (!copy->hinfo.os) | |
1569 | return NULL; | |
1570 | break; | |
1571 | ||
1572 | case DNS_TYPE_TXT: | |
1573 | case DNS_TYPE_SPF: | |
1574 | copy->txt.items = dns_txt_item_copy(rr->txt.items); | |
1575 | if (!copy->txt.items) | |
1576 | return NULL; | |
1577 | break; | |
1578 | ||
1579 | case DNS_TYPE_A: | |
1580 | copy->a = rr->a; | |
1581 | break; | |
1582 | ||
1583 | case DNS_TYPE_AAAA: | |
1584 | copy->aaaa = rr->aaaa; | |
1585 | break; | |
1586 | ||
1587 | case DNS_TYPE_SOA: | |
1588 | copy->soa.mname = strdup(rr->soa.mname); | |
1589 | if (!copy->soa.mname) | |
1590 | return NULL; | |
1591 | copy->soa.rname = strdup(rr->soa.rname); | |
1592 | if (!copy->soa.rname) | |
1593 | return NULL; | |
1594 | copy->soa.serial = rr->soa.serial; | |
1595 | copy->soa.refresh = rr->soa.refresh; | |
1596 | copy->soa.retry = rr->soa.retry; | |
1597 | copy->soa.expire = rr->soa.expire; | |
1598 | copy->soa.minimum = rr->soa.minimum; | |
1599 | break; | |
1600 | ||
1601 | case DNS_TYPE_MX: | |
1602 | copy->mx.priority = rr->mx.priority; | |
1603 | copy->mx.exchange = strdup(rr->mx.exchange); | |
1604 | if (!copy->mx.exchange) | |
1605 | return NULL; | |
1606 | break; | |
1607 | ||
1608 | case DNS_TYPE_LOC: | |
1609 | copy->loc = rr->loc; | |
1610 | break; | |
1611 | ||
1612 | case DNS_TYPE_SSHFP: | |
1613 | copy->sshfp.algorithm = rr->sshfp.algorithm; | |
1614 | copy->sshfp.fptype = rr->sshfp.fptype; | |
1615 | copy->sshfp.fingerprint = memdup(rr->sshfp.fingerprint, rr->sshfp.fingerprint_size); | |
1616 | if (!copy->sshfp.fingerprint) | |
1617 | return NULL; | |
1618 | copy->sshfp.fingerprint_size = rr->sshfp.fingerprint_size; | |
1619 | break; | |
1620 | ||
1621 | case DNS_TYPE_DNSKEY: | |
1622 | copy->dnskey.flags = rr->dnskey.flags; | |
1623 | copy->dnskey.protocol = rr->dnskey.protocol; | |
1624 | copy->dnskey.algorithm = rr->dnskey.algorithm; | |
1625 | copy->dnskey.key = memdup(rr->dnskey.key, rr->dnskey.key_size); | |
1626 | if (!copy->dnskey.key) | |
1627 | return NULL; | |
1628 | copy->dnskey.key_size = rr->dnskey.key_size; | |
1629 | break; | |
1630 | ||
1631 | case DNS_TYPE_RRSIG: | |
1632 | copy->rrsig.type_covered = rr->rrsig.type_covered; | |
1633 | copy->rrsig.algorithm = rr->rrsig.algorithm; | |
1634 | copy->rrsig.labels = rr->rrsig.labels; | |
1635 | copy->rrsig.original_ttl = rr->rrsig.original_ttl; | |
1636 | copy->rrsig.expiration = rr->rrsig.expiration; | |
1637 | copy->rrsig.inception = rr->rrsig.inception; | |
1638 | copy->rrsig.key_tag = rr->rrsig.key_tag; | |
1639 | copy->rrsig.signer = strdup(rr->rrsig.signer); | |
1640 | if (!copy->rrsig.signer) | |
1641 | return NULL; | |
1642 | copy->rrsig.signature = memdup(rr->rrsig.signature, rr->rrsig.signature_size); | |
1643 | if (!copy->rrsig.signature) | |
1644 | return NULL; | |
1645 | copy->rrsig.signature_size = rr->rrsig.signature_size; | |
1646 | break; | |
1647 | ||
1648 | case DNS_TYPE_NSEC: | |
1649 | copy->nsec.next_domain_name = strdup(rr->nsec.next_domain_name); | |
1650 | if (!copy->nsec.next_domain_name) | |
1651 | return NULL; | |
1652 | copy->nsec.types = bitmap_copy(rr->nsec.types); | |
1653 | if (!copy->nsec.types) | |
1654 | return NULL; | |
1655 | break; | |
1656 | ||
1657 | case DNS_TYPE_DS: | |
1658 | copy->ds.key_tag = rr->ds.key_tag; | |
1659 | copy->ds.algorithm = rr->ds.algorithm; | |
1660 | copy->ds.digest_type = rr->ds.digest_type; | |
1661 | copy->ds.digest = memdup(rr->ds.digest, rr->ds.digest_size); | |
1662 | if (!copy->ds.digest) | |
1663 | return NULL; | |
1664 | copy->ds.digest_size = rr->ds.digest_size; | |
1665 | break; | |
1666 | ||
1667 | case DNS_TYPE_NSEC3: | |
1668 | copy->nsec3.algorithm = rr->nsec3.algorithm; | |
1669 | copy->nsec3.flags = rr->nsec3.flags; | |
1670 | copy->nsec3.iterations = rr->nsec3.iterations; | |
1671 | copy->nsec3.salt = memdup(rr->nsec3.salt, rr->nsec3.salt_size); | |
1672 | if (!copy->nsec3.salt) | |
1673 | return NULL; | |
1674 | copy->nsec3.salt_size = rr->nsec3.salt_size; | |
1675 | copy->nsec3.next_hashed_name = memdup(rr->nsec3.next_hashed_name, rr->nsec3.next_hashed_name_size); | |
1676 | if (!copy->nsec3.next_hashed_name_size) | |
1677 | return NULL; | |
1678 | copy->nsec3.next_hashed_name_size = rr->nsec3.next_hashed_name_size; | |
1679 | copy->nsec3.types = bitmap_copy(rr->nsec3.types); | |
1680 | if (!copy->nsec3.types) | |
1681 | return NULL; | |
1682 | break; | |
1683 | ||
1684 | case DNS_TYPE_TLSA: | |
1685 | copy->tlsa.cert_usage = rr->tlsa.cert_usage; | |
1686 | copy->tlsa.selector = rr->tlsa.selector; | |
1687 | copy->tlsa.matching_type = rr->tlsa.matching_type; | |
1688 | copy->tlsa.data = memdup(rr->tlsa.data, rr->tlsa.data_size); | |
1689 | if (!copy->tlsa.data) | |
1690 | return NULL; | |
1691 | copy->tlsa.data_size = rr->tlsa.data_size; | |
1692 | break; | |
1693 | ||
1694 | case DNS_TYPE_CAA: | |
1695 | copy->caa.flags = rr->caa.flags; | |
1696 | copy->caa.tag = strdup(rr->caa.tag); | |
1697 | if (!copy->caa.tag) | |
1698 | return NULL; | |
1699 | copy->caa.value = memdup(rr->caa.value, rr->caa.value_size); | |
1700 | if (!copy->caa.value) | |
1701 | return NULL; | |
1702 | copy->caa.value_size = rr->caa.value_size; | |
1703 | break; | |
1704 | ||
1705 | case DNS_TYPE_OPT: | |
1706 | default: | |
1707 | copy->generic.data = memdup(rr->generic.data, rr->generic.data_size); | |
1708 | if (!copy->generic.data) | |
1709 | return NULL; | |
1710 | copy->generic.data_size = rr->generic.data_size; | |
1711 | break; | |
1712 | } | |
1713 | ||
1714 | t = TAKE_PTR(copy); | |
1715 | ||
1716 | return t; | |
1717 | } | |
1718 | ||
1719 | int dns_resource_record_clamp_ttl(DnsResourceRecord **rr, uint32_t max_ttl) { | |
1720 | DnsResourceRecord *old_rr, *new_rr; | |
1721 | uint32_t new_ttl; | |
1722 | ||
1723 | assert(rr); | |
1724 | old_rr = *rr; | |
1725 | ||
1726 | if (old_rr->key->type == DNS_TYPE_OPT) | |
1727 | return -EINVAL; | |
1728 | ||
1729 | new_ttl = MIN(old_rr->ttl, max_ttl); | |
1730 | if (new_ttl == old_rr->ttl) | |
1731 | return 0; | |
1732 | ||
1733 | if (old_rr->n_ref == 1) { | |
1734 | /* Patch in place */ | |
1735 | old_rr->ttl = new_ttl; | |
1736 | return 1; | |
1737 | } | |
1738 | ||
1739 | new_rr = dns_resource_record_copy(old_rr); | |
1740 | if (!new_rr) | |
1741 | return -ENOMEM; | |
1742 | ||
1743 | new_rr->ttl = new_ttl; | |
1744 | ||
1745 | dns_resource_record_unref(*rr); | |
1746 | *rr = new_rr; | |
1747 | ||
1748 | return 1; | |
1749 | } | |
1750 | ||
1751 | DnsTxtItem *dns_txt_item_free_all(DnsTxtItem *i) { | |
1752 | DnsTxtItem *n; | |
1753 | ||
1754 | if (!i) | |
1755 | return NULL; | |
1756 | ||
1757 | n = i->items_next; | |
1758 | ||
1759 | free(i); | |
1760 | return dns_txt_item_free_all(n); | |
1761 | } | |
1762 | ||
1763 | bool dns_txt_item_equal(DnsTxtItem *a, DnsTxtItem *b) { | |
1764 | ||
1765 | if (a == b) | |
1766 | return true; | |
1767 | ||
1768 | if (!a != !b) | |
1769 | return false; | |
1770 | ||
1771 | if (!a) | |
1772 | return true; | |
1773 | ||
1774 | if (a->length != b->length) | |
1775 | return false; | |
1776 | ||
1777 | if (memcmp(a->data, b->data, a->length) != 0) | |
1778 | return false; | |
1779 | ||
1780 | return dns_txt_item_equal(a->items_next, b->items_next); | |
1781 | } | |
1782 | ||
1783 | DnsTxtItem *dns_txt_item_copy(DnsTxtItem *first) { | |
1784 | DnsTxtItem *i, *copy = NULL, *end = NULL; | |
1785 | ||
1786 | LIST_FOREACH(items, i, first) { | |
1787 | DnsTxtItem *j; | |
1788 | ||
1789 | j = memdup(i, offsetof(DnsTxtItem, data) + i->length + 1); | |
1790 | if (!j) { | |
1791 | dns_txt_item_free_all(copy); | |
1792 | return NULL; | |
1793 | } | |
1794 | ||
1795 | LIST_INSERT_AFTER(items, copy, end, j); | |
1796 | end = j; | |
1797 | } | |
1798 | ||
1799 | return copy; | |
1800 | } | |
1801 | ||
1802 | int dns_txt_item_new_empty(DnsTxtItem **ret) { | |
1803 | DnsTxtItem *i; | |
1804 | ||
1805 | /* RFC 6763, section 6.1 suggests to treat | |
1806 | * empty TXT RRs as equivalent to a TXT record | |
1807 | * with a single empty string. */ | |
1808 | ||
1809 | i = malloc0(offsetof(DnsTxtItem, data) + 1); /* for safety reasons we add an extra NUL byte */ | |
1810 | if (!i) | |
1811 | return -ENOMEM; | |
1812 | ||
1813 | *ret = i; | |
1814 | ||
1815 | return 0; | |
1816 | } | |
1817 | ||
1818 | static const char* const dnssec_algorithm_table[_DNSSEC_ALGORITHM_MAX_DEFINED] = { | |
1819 | /* Mnemonics as listed on https://www.iana.org/assignments/dns-sec-alg-numbers/dns-sec-alg-numbers.xhtml */ | |
1820 | [DNSSEC_ALGORITHM_RSAMD5] = "RSAMD5", | |
1821 | [DNSSEC_ALGORITHM_DH] = "DH", | |
1822 | [DNSSEC_ALGORITHM_DSA] = "DSA", | |
1823 | [DNSSEC_ALGORITHM_ECC] = "ECC", | |
1824 | [DNSSEC_ALGORITHM_RSASHA1] = "RSASHA1", | |
1825 | [DNSSEC_ALGORITHM_DSA_NSEC3_SHA1] = "DSA-NSEC3-SHA1", | |
1826 | [DNSSEC_ALGORITHM_RSASHA1_NSEC3_SHA1] = "RSASHA1-NSEC3-SHA1", | |
1827 | [DNSSEC_ALGORITHM_RSASHA256] = "RSASHA256", | |
1828 | [DNSSEC_ALGORITHM_RSASHA512] = "RSASHA512", | |
1829 | [DNSSEC_ALGORITHM_ECC_GOST] = "ECC-GOST", | |
1830 | [DNSSEC_ALGORITHM_ECDSAP256SHA256] = "ECDSAP256SHA256", | |
1831 | [DNSSEC_ALGORITHM_ECDSAP384SHA384] = "ECDSAP384SHA384", | |
1832 | [DNSSEC_ALGORITHM_ED25519] = "ED25519", | |
1833 | [DNSSEC_ALGORITHM_ED448] = "ED448", | |
1834 | [DNSSEC_ALGORITHM_INDIRECT] = "INDIRECT", | |
1835 | [DNSSEC_ALGORITHM_PRIVATEDNS] = "PRIVATEDNS", | |
1836 | [DNSSEC_ALGORITHM_PRIVATEOID] = "PRIVATEOID", | |
1837 | }; | |
1838 | DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(dnssec_algorithm, int, 255); | |
1839 | ||
1840 | static const char* const dnssec_digest_table[_DNSSEC_DIGEST_MAX_DEFINED] = { | |
1841 | /* Names as listed on https://www.iana.org/assignments/ds-rr-types/ds-rr-types.xhtml */ | |
1842 | [DNSSEC_DIGEST_SHA1] = "SHA-1", | |
1843 | [DNSSEC_DIGEST_SHA256] = "SHA-256", | |
1844 | [DNSSEC_DIGEST_GOST_R_34_11_94] = "GOST_R_34.11-94", | |
1845 | [DNSSEC_DIGEST_SHA384] = "SHA-384", | |
1846 | }; | |
1847 | DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(dnssec_digest, int, 255); |