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1/* SPDX-License-Identifier: LGPL-2.1-or-later */
2
3#include <math.h>
4
5#include "alloc-util.h"
6#include "bitmap.h"
7#include "dns-domain.h"
8#include "dns-type.h"
9#include "escape.h"
10#include "hash-funcs.h"
11#include "hexdecoct.h"
12#include "json-util.h"
13#include "memory-util.h"
14#include "resolved-dns-answer.h"
15#include "resolved-dns-dnssec.h"
16#include "resolved-dns-packet.h"
17#include "resolved-dns-rr.h"
18#include "siphash24.h"
19#include "string-table.h"
20#include "string-util.h"
21#include "strv.h"
22#include "terminal-util.h"
23#include "time-util.h"
24#include "unaligned.h"
25
26DnsResourceKey* dns_resource_key_new(uint16_t class, uint16_t type, const char *name) {
27 DnsResourceKey *k;
28 size_t l;
29
30 assert(name);
31
32 l = strlen(name);
33 k = malloc0(sizeof(DnsResourceKey) + l + 1);
34 if (!k)
35 return NULL;
36
37 k->n_ref = 1;
38 k->class = class;
39 k->type = type;
40
41 strcpy((char*) k + sizeof(DnsResourceKey), name);
42
43 return k;
44}
45
46DnsResourceKey* dns_resource_key_new_redirect(const DnsResourceKey *key, const DnsResourceRecord *cname) {
47 int r;
48
49 assert(key);
50 assert(cname);
51
52 assert(IN_SET(cname->key->type, DNS_TYPE_CNAME, DNS_TYPE_DNAME));
53
54 if (cname->key->type == DNS_TYPE_CNAME)
55 return dns_resource_key_new(key->class, key->type, cname->cname.name);
56 else {
57 _cleanup_free_ char *destination = NULL;
58 DnsResourceKey *k;
59
60 r = dns_name_change_suffix(dns_resource_key_name(key), dns_resource_key_name(cname->key), cname->dname.name, &destination);
61 if (r < 0)
62 return NULL;
63 if (r == 0)
64 return dns_resource_key_ref((DnsResourceKey*) key);
65
66 k = dns_resource_key_new_consume(key->class, key->type, destination);
67 if (!k)
68 return NULL;
69
70 TAKE_PTR(destination);
71 return k;
72 }
73}
74
75int dns_resource_key_new_append_suffix(DnsResourceKey **ret, DnsResourceKey *key, char *name) {
76 DnsResourceKey *new_key;
77 char *joined;
78 int r;
79
80 assert(ret);
81 assert(key);
82 assert(name);
83
84 if (dns_name_is_root(name)) {
85 *ret = dns_resource_key_ref(key);
86 return 0;
87 }
88
89 r = dns_name_concat(dns_resource_key_name(key), name, 0, &joined);
90 if (r < 0)
91 return r;
92
93 new_key = dns_resource_key_new_consume(key->class, key->type, joined);
94 if (!new_key) {
95 free(joined);
96 return -ENOMEM;
97 }
98
99 *ret = new_key;
100 return 0;
101}
102
103DnsResourceKey* dns_resource_key_new_consume(uint16_t class, uint16_t type, char *name) {
104 DnsResourceKey *k;
105
106 assert(name);
107
108 k = new(DnsResourceKey, 1);
109 if (!k)
110 return NULL;
111
112 *k = (DnsResourceKey) {
113 .n_ref = 1,
114 .class = class,
115 .type = type,
116 ._name = name,
117 };
118
119 return k;
120}
121
122DnsResourceKey* dns_resource_key_ref(DnsResourceKey *k) {
123
124 if (!k)
125 return NULL;
126
127 /* Static/const keys created with DNS_RESOURCE_KEY_CONST will
128 * set this to -1, they should not be reffed/unreffed */
129 assert(k->n_ref != UINT_MAX);
130
131 assert(k->n_ref > 0);
132 k->n_ref++;
133
134 return k;
135}
136
137DnsResourceKey* dns_resource_key_unref(DnsResourceKey *k) {
138 if (!k)
139 return NULL;
140
141 assert(k->n_ref != UINT_MAX);
142 assert(k->n_ref > 0);
143
144 if (k->n_ref == 1) {
145 free(k->_name);
146 free(k);
147 } else
148 k->n_ref--;
149
150 return NULL;
151}
152
153const char* dns_resource_key_name(const DnsResourceKey *key) {
154 const char *name;
155
156 if (!key)
157 return NULL;
158
159 if (key->_name)
160 name = key->_name;
161 else
162 name = (char*) key + sizeof(DnsResourceKey);
163
164 if (dns_name_is_root(name))
165 return ".";
166 else
167 return name;
168}
169
170bool dns_resource_key_is_address(const DnsResourceKey *key) {
171 assert(key);
172
173 /* Check if this is an A or AAAA resource key */
174
175 return key->class == DNS_CLASS_IN && IN_SET(key->type, DNS_TYPE_A, DNS_TYPE_AAAA);
176}
177
178bool dns_resource_key_is_dnssd_ptr(const DnsResourceKey *key) {
179 assert(key);
180
181 /* Check if this is a PTR resource key used in
182 Service Instance Enumeration as described in RFC6763 p4.1. */
183
184 if (key->type != DNS_TYPE_PTR)
185 return false;
186
187 return dns_name_endswith(dns_resource_key_name(key), "_tcp.local") ||
188 dns_name_endswith(dns_resource_key_name(key), "_udp.local");
189}
190
191bool dns_resource_key_is_dnssd_two_label_ptr(const DnsResourceKey *key) {
192 assert(key);
193
194 /* Check if this is a PTR resource key used in Service Instance
195 * Enumeration as described in RFC6763 § 4.1, excluding selective
196 * service names described in RFC6763 § 7.1. */
197
198 if (key->type != DNS_TYPE_PTR)
199 return false;
200
201 const char *name = dns_resource_key_name(key);
202 if (dns_name_parent(&name) <= 0)
203 return false;
204
205 return dns_name_equal(name, "_tcp.local") > 0 || dns_name_equal(name, "_udp.local") > 0;
206}
207
208int dns_resource_key_equal(const DnsResourceKey *a, const DnsResourceKey *b) {
209 int r;
210
211 if (a == b)
212 return 1;
213
214 r = dns_name_equal(dns_resource_key_name(a), dns_resource_key_name(b));
215 if (r <= 0)
216 return r;
217
218 if (a->class != b->class)
219 return 0;
220
221 if (a->type != b->type)
222 return 0;
223
224 return 1;
225}
226
227int dns_resource_key_match_rr(const DnsResourceKey *key, DnsResourceRecord *rr, const char *search_domain) {
228 int r;
229
230 assert(key);
231 assert(rr);
232
233 if (key == rr->key)
234 return 1;
235
236 /* Checks if an rr matches the specified key. If a search
237 * domain is specified, it will also be checked if the key
238 * with the search domain suffixed might match the RR. */
239
240 if (rr->key->class != key->class && key->class != DNS_CLASS_ANY)
241 return 0;
242
243 if (rr->key->type != key->type && key->type != DNS_TYPE_ANY)
244 return 0;
245
246 r = dns_name_equal(dns_resource_key_name(rr->key), dns_resource_key_name(key));
247 if (r != 0)
248 return r;
249
250 if (search_domain) {
251 _cleanup_free_ char *joined = NULL;
252
253 r = dns_name_concat(dns_resource_key_name(key), search_domain, 0, &joined);
254 if (r < 0)
255 return r;
256
257 return dns_name_equal(dns_resource_key_name(rr->key), joined);
258 }
259
260 return 0;
261}
262
263int dns_resource_key_match_cname_or_dname(const DnsResourceKey *key, const DnsResourceKey *cname, const char *search_domain) {
264 int r;
265
266 assert(key);
267 assert(cname);
268
269 if (cname->class != key->class && key->class != DNS_CLASS_ANY)
270 return 0;
271
272 if (!dns_type_may_redirect(key->type))
273 return 0;
274
275 if (cname->type == DNS_TYPE_CNAME)
276 r = dns_name_equal(dns_resource_key_name(key), dns_resource_key_name(cname));
277 else if (cname->type == DNS_TYPE_DNAME)
278 r = dns_name_endswith(dns_resource_key_name(key), dns_resource_key_name(cname));
279 else
280 return 0;
281
282 if (r != 0)
283 return r;
284
285 if (search_domain) {
286 _cleanup_free_ char *joined = NULL;
287
288 r = dns_name_concat(dns_resource_key_name(key), search_domain, 0, &joined);
289 if (r < 0)
290 return r;
291
292 if (cname->type == DNS_TYPE_CNAME)
293 return dns_name_equal(joined, dns_resource_key_name(cname));
294 else if (cname->type == DNS_TYPE_DNAME)
295 return dns_name_endswith(joined, dns_resource_key_name(cname));
296 }
297
298 return 0;
299}
300
301int dns_resource_key_match_soa(const DnsResourceKey *key, const DnsResourceKey *soa) {
302 assert(soa);
303 assert(key);
304
305 /* Checks whether 'soa' is a SOA record for the specified key. */
306
307 if (soa->class != key->class)
308 return 0;
309
310 if (soa->type != DNS_TYPE_SOA)
311 return 0;
312
313 return dns_name_endswith(dns_resource_key_name(key), dns_resource_key_name(soa));
314}
315
316void dns_resource_key_hash_func(const DnsResourceKey *k, struct siphash *state) {
317 assert(k);
318
319 dns_name_hash_func(dns_resource_key_name(k), state);
320 siphash24_compress_typesafe(k->class, state);
321 siphash24_compress_typesafe(k->type, state);
322}
323
324int dns_resource_key_compare_func(const DnsResourceKey *x, const DnsResourceKey *y) {
325 int r;
326
327 r = dns_name_compare_func(dns_resource_key_name(x), dns_resource_key_name(y));
328 if (r != 0)
329 return r;
330
331 r = CMP(x->type, y->type);
332 if (r != 0)
333 return r;
334
335 return CMP(x->class, y->class);
336}
337
338DEFINE_HASH_OPS(dns_resource_key_hash_ops, DnsResourceKey, dns_resource_key_hash_func, dns_resource_key_compare_func);
339
340char* dns_resource_key_to_string(const DnsResourceKey *key, char *buf, size_t buf_size) {
341 const char *c, *t;
342 char *ans = buf;
343
344 /* If we cannot convert the CLASS/TYPE into a known string,
345 use the format recommended by RFC 3597, Section 5. */
346
347 c = dns_class_to_string(key->class);
348 t = dns_type_to_string(key->type);
349
350 (void) snprintf(buf, buf_size, "%s %s%s%.0u %s%s%.0u",
351 dns_resource_key_name(key),
352 strempty(c), c ? "" : "CLASS", c ? 0u : key->class,
353 strempty(t), t ? "" : "TYPE", t ? 0u : key->type);
354
355 return ans;
356}
357
358bool dns_resource_key_reduce(DnsResourceKey **a, DnsResourceKey **b) {
359 assert(a);
360 assert(b);
361
362 /* Try to replace one RR key by another if they are identical, thus saving a bit of memory. Note that we do
363 * this only for RR keys, not for RRs themselves, as they carry a lot of additional metadata (where they come
364 * from, validity data, and suchlike), and cannot be replaced so easily by other RRs that have the same
365 * superficial data. */
366
367 if (!*a)
368 return false;
369 if (!*b)
370 return false;
371
372 /* We refuse merging const keys */
373 if ((*a)->n_ref == UINT_MAX)
374 return false;
375 if ((*b)->n_ref == UINT_MAX)
376 return false;
377
378 /* Already the same? */
379 if (*a == *b)
380 return true;
381
382 /* Are they really identical? */
383 if (dns_resource_key_equal(*a, *b) <= 0)
384 return false;
385
386 /* Keep the one which already has more references. */
387 if ((*a)->n_ref > (*b)->n_ref)
388 DNS_RESOURCE_KEY_REPLACE(*b, dns_resource_key_ref(*a));
389 else
390 DNS_RESOURCE_KEY_REPLACE(*a, dns_resource_key_ref(*b));
391
392 return true;
393}
394
395DnsResourceRecord* dns_resource_record_new(DnsResourceKey *key) {
396 DnsResourceRecord *rr;
397
398 rr = new(DnsResourceRecord, 1);
399 if (!rr)
400 return NULL;
401
402 *rr = (DnsResourceRecord) {
403 .n_ref = 1,
404 .key = dns_resource_key_ref(key),
405 .expiry = USEC_INFINITY,
406 .n_skip_labels_signer = UINT8_MAX,
407 .n_skip_labels_source = UINT8_MAX,
408 };
409
410 return rr;
411}
412
413DnsResourceRecord* dns_resource_record_new_full(uint16_t class, uint16_t type, const char *name) {
414 _cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL;
415
416 key = dns_resource_key_new(class, type, name);
417 if (!key)
418 return NULL;
419
420 return dns_resource_record_new(key);
421}
422
423static DnsResourceRecord* dns_resource_record_free(DnsResourceRecord *rr) {
424 assert(rr);
425
426 if (rr->key) {
427 switch (rr->key->type) {
428
429 case DNS_TYPE_SRV:
430 free(rr->srv.name);
431 break;
432
433 case DNS_TYPE_PTR:
434 case DNS_TYPE_NS:
435 case DNS_TYPE_CNAME:
436 case DNS_TYPE_DNAME:
437 free(rr->ptr.name);
438 break;
439
440 case DNS_TYPE_HINFO:
441 free(rr->hinfo.cpu);
442 free(rr->hinfo.os);
443 break;
444
445 case DNS_TYPE_TXT:
446 case DNS_TYPE_SPF:
447 dns_txt_item_free_all(rr->txt.items);
448 break;
449
450 case DNS_TYPE_SOA:
451 free(rr->soa.mname);
452 free(rr->soa.rname);
453 break;
454
455 case DNS_TYPE_MX:
456 free(rr->mx.exchange);
457 break;
458
459 case DNS_TYPE_DS:
460 free(rr->ds.digest);
461 break;
462
463 case DNS_TYPE_SSHFP:
464 free(rr->sshfp.fingerprint);
465 break;
466
467 case DNS_TYPE_DNSKEY:
468 free(rr->dnskey.key);
469 break;
470
471 case DNS_TYPE_RRSIG:
472 free(rr->rrsig.signer);
473 free(rr->rrsig.signature);
474 break;
475
476 case DNS_TYPE_NSEC:
477 free(rr->nsec.next_domain_name);
478 bitmap_free(rr->nsec.types);
479 break;
480
481 case DNS_TYPE_NSEC3:
482 free(rr->nsec3.next_hashed_name);
483 free(rr->nsec3.salt);
484 bitmap_free(rr->nsec3.types);
485 break;
486
487 case DNS_TYPE_LOC:
488 case DNS_TYPE_A:
489 case DNS_TYPE_AAAA:
490 break;
491
492 case DNS_TYPE_TLSA:
493 free(rr->tlsa.data);
494 break;
495
496 case DNS_TYPE_SVCB:
497 case DNS_TYPE_HTTPS:
498 free(rr->svcb.target_name);
499 dns_svc_param_free_all(rr->svcb.params);
500 break;
501
502 case DNS_TYPE_CAA:
503 free(rr->caa.tag);
504 free(rr->caa.value);
505 break;
506
507 case DNS_TYPE_NAPTR:
508 free(rr->naptr.flags);
509 free(rr->naptr.services);
510 free(rr->naptr.regexp);
511 free(rr->naptr.replacement);
512 break;
513
514 case DNS_TYPE_OPENPGPKEY:
515 default:
516 if (!rr->unparsable)
517 free(rr->generic.data);
518 }
519
520 if (rr->unparsable)
521 free(rr->generic.data);
522
523 free(rr->wire_format);
524 dns_resource_key_unref(rr->key);
525 }
526
527 free(rr->to_string);
528 return mfree(rr);
529}
530
531DEFINE_TRIVIAL_REF_UNREF_FUNC(DnsResourceRecord, dns_resource_record, dns_resource_record_free);
532
533int dns_resource_record_new_reverse(DnsResourceRecord **ret, int family, const union in_addr_union *address, const char *hostname) {
534 _cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL;
535 _cleanup_(dns_resource_record_unrefp) DnsResourceRecord *rr = NULL;
536 _cleanup_free_ char *ptr = NULL;
537 int r;
538
539 assert(ret);
540 assert(address);
541 assert(hostname);
542
543 r = dns_name_reverse(family, address, &ptr);
544 if (r < 0)
545 return r;
546
547 key = dns_resource_key_new_consume(DNS_CLASS_IN, DNS_TYPE_PTR, ptr);
548 if (!key)
549 return -ENOMEM;
550
551 ptr = NULL;
552
553 rr = dns_resource_record_new(key);
554 if (!rr)
555 return -ENOMEM;
556
557 rr->ptr.name = strdup(hostname);
558 if (!rr->ptr.name)
559 return -ENOMEM;
560
561 *ret = TAKE_PTR(rr);
562
563 return 0;
564}
565
566int dns_resource_record_new_address(DnsResourceRecord **ret, int family, const union in_addr_union *address, const char *name) {
567 DnsResourceRecord *rr;
568
569 assert(ret);
570 assert(address);
571 assert(family);
572
573 if (family == AF_INET) {
574
575 rr = dns_resource_record_new_full(DNS_CLASS_IN, DNS_TYPE_A, name);
576 if (!rr)
577 return -ENOMEM;
578
579 rr->a.in_addr = address->in;
580
581 } else if (family == AF_INET6) {
582
583 rr = dns_resource_record_new_full(DNS_CLASS_IN, DNS_TYPE_AAAA, name);
584 if (!rr)
585 return -ENOMEM;
586
587 rr->aaaa.in6_addr = address->in6;
588 } else
589 return -EAFNOSUPPORT;
590
591 *ret = rr;
592
593 return 0;
594}
595
596#define FIELD_EQUAL(a, b, field) \
597 ((a).field ## _size == (b).field ## _size && \
598 memcmp_safe((a).field, (b).field, (a).field ## _size) == 0)
599
600int dns_resource_record_payload_equal(const DnsResourceRecord *a, const DnsResourceRecord *b) {
601 int r;
602
603 /* Check if a and b are the same, but don't look at their keys */
604
605 if (a->unparsable != b->unparsable)
606 return 0;
607
608 switch (a->unparsable ? _DNS_TYPE_INVALID : a->key->type) {
609
610 case DNS_TYPE_SRV:
611 r = dns_name_equal(a->srv.name, b->srv.name);
612 if (r <= 0)
613 return r;
614
615 return a->srv.priority == b->srv.priority &&
616 a->srv.weight == b->srv.weight &&
617 a->srv.port == b->srv.port;
618
619 case DNS_TYPE_PTR:
620 case DNS_TYPE_NS:
621 case DNS_TYPE_CNAME:
622 case DNS_TYPE_DNAME:
623 return dns_name_equal(a->ptr.name, b->ptr.name);
624
625 case DNS_TYPE_HINFO:
626 return strcaseeq(a->hinfo.cpu, b->hinfo.cpu) &&
627 strcaseeq(a->hinfo.os, b->hinfo.os);
628
629 case DNS_TYPE_SPF: /* exactly the same as TXT */
630 case DNS_TYPE_TXT:
631 return dns_txt_item_equal(a->txt.items, b->txt.items);
632
633 case DNS_TYPE_A:
634 return memcmp(&a->a.in_addr, &b->a.in_addr, sizeof(struct in_addr)) == 0;
635
636 case DNS_TYPE_AAAA:
637 return memcmp(&a->aaaa.in6_addr, &b->aaaa.in6_addr, sizeof(struct in6_addr)) == 0;
638
639 case DNS_TYPE_SOA:
640 r = dns_name_equal(a->soa.mname, b->soa.mname);
641 if (r <= 0)
642 return r;
643 r = dns_name_equal(a->soa.rname, b->soa.rname);
644 if (r <= 0)
645 return r;
646
647 return a->soa.serial == b->soa.serial &&
648 a->soa.refresh == b->soa.refresh &&
649 a->soa.retry == b->soa.retry &&
650 a->soa.expire == b->soa.expire &&
651 a->soa.minimum == b->soa.minimum;
652
653 case DNS_TYPE_MX:
654 if (a->mx.priority != b->mx.priority)
655 return 0;
656
657 return dns_name_equal(a->mx.exchange, b->mx.exchange);
658
659 case DNS_TYPE_LOC:
660 assert(a->loc.version == b->loc.version);
661
662 return a->loc.size == b->loc.size &&
663 a->loc.horiz_pre == b->loc.horiz_pre &&
664 a->loc.vert_pre == b->loc.vert_pre &&
665 a->loc.latitude == b->loc.latitude &&
666 a->loc.longitude == b->loc.longitude &&
667 a->loc.altitude == b->loc.altitude;
668
669 case DNS_TYPE_DS:
670 return a->ds.key_tag == b->ds.key_tag &&
671 a->ds.algorithm == b->ds.algorithm &&
672 a->ds.digest_type == b->ds.digest_type &&
673 FIELD_EQUAL(a->ds, b->ds, digest);
674
675 case DNS_TYPE_SSHFP:
676 return a->sshfp.algorithm == b->sshfp.algorithm &&
677 a->sshfp.fptype == b->sshfp.fptype &&
678 FIELD_EQUAL(a->sshfp, b->sshfp, fingerprint);
679
680 case DNS_TYPE_DNSKEY:
681 return a->dnskey.flags == b->dnskey.flags &&
682 a->dnskey.protocol == b->dnskey.protocol &&
683 a->dnskey.algorithm == b->dnskey.algorithm &&
684 FIELD_EQUAL(a->dnskey, b->dnskey, key);
685
686 case DNS_TYPE_RRSIG:
687 /* do the fast comparisons first */
688 if (!(a->rrsig.type_covered == b->rrsig.type_covered &&
689 a->rrsig.algorithm == b->rrsig.algorithm &&
690 a->rrsig.labels == b->rrsig.labels &&
691 a->rrsig.original_ttl == b->rrsig.original_ttl &&
692 a->rrsig.expiration == b->rrsig.expiration &&
693 a->rrsig.inception == b->rrsig.inception &&
694 a->rrsig.key_tag == b->rrsig.key_tag &&
695 FIELD_EQUAL(a->rrsig, b->rrsig, signature)))
696 return false;
697
698 return dns_name_equal(a->rrsig.signer, b->rrsig.signer);
699
700 case DNS_TYPE_NSEC:
701 r = dns_name_equal(a->nsec.next_domain_name, b->nsec.next_domain_name);
702 if (r <= 0)
703 return r;
704
705 return bitmap_equal(a->nsec.types, b->nsec.types);
706
707 case DNS_TYPE_NSEC3:
708 return a->nsec3.algorithm == b->nsec3.algorithm &&
709 a->nsec3.flags == b->nsec3.flags &&
710 a->nsec3.iterations == b->nsec3.iterations &&
711 FIELD_EQUAL(a->nsec3, b->nsec3, salt) &&
712 FIELD_EQUAL(a->nsec3, b->nsec3, next_hashed_name) &&
713 bitmap_equal(a->nsec3.types, b->nsec3.types);
714
715 case DNS_TYPE_TLSA:
716 return a->tlsa.cert_usage == b->tlsa.cert_usage &&
717 a->tlsa.selector == b->tlsa.selector &&
718 a->tlsa.matching_type == b->tlsa.matching_type &&
719 FIELD_EQUAL(a->tlsa, b->tlsa, data);
720
721 case DNS_TYPE_SVCB:
722 case DNS_TYPE_HTTPS:
723
724 if (!(a->svcb.priority == b->svcb.priority &&
725 dns_svc_params_equal(a->svcb.params, b->svcb.params)))
726 return false;
727
728 return dns_name_equal(a->svcb.target_name, b->svcb.target_name);
729
730 case DNS_TYPE_CAA:
731 return a->caa.flags == b->caa.flags &&
732 streq(a->caa.tag, b->caa.tag) &&
733 FIELD_EQUAL(a->caa, b->caa, value);
734
735 case DNS_TYPE_NAPTR:
736 r = dns_name_equal(a->naptr.replacement, b->naptr.replacement);
737 if (r <= 0)
738 return r;
739
740 return a->naptr.order == b->naptr.order &&
741 a->naptr.preference == b->naptr.preference &&
742 streq(a->naptr.flags, b->naptr.flags) &&
743 streq(a->naptr.services, b->naptr.services) &&
744 streq(a->naptr.regexp, b->naptr.regexp);
745
746 case DNS_TYPE_OPENPGPKEY:
747 default:
748 return FIELD_EQUAL(a->generic, b->generic, data);
749 }
750}
751
752int dns_resource_record_equal(const DnsResourceRecord *a, const DnsResourceRecord *b) {
753 int r;
754
755 assert(a);
756 assert(b);
757
758 if (a == b)
759 return 1;
760
761 r = dns_resource_key_equal(a->key, b->key);
762 if (r <= 0)
763 return r;
764
765 return dns_resource_record_payload_equal(a, b);
766}
767
768static char* format_location(uint32_t latitude, uint32_t longitude, uint32_t altitude,
769 uint8_t size, uint8_t horiz_pre, uint8_t vert_pre) {
770 char *s;
771 char NS = latitude >= 1U<<31 ? 'N' : 'S';
772 char EW = longitude >= 1U<<31 ? 'E' : 'W';
773
774 int lat = latitude >= 1U<<31 ? (int) (latitude - (1U<<31)) : (int) ((1U<<31) - latitude);
775 int lon = longitude >= 1U<<31 ? (int) (longitude - (1U<<31)) : (int) ((1U<<31) - longitude);
776 double alt = altitude >= 10000000u ? altitude - 10000000u : -(double)(10000000u - altitude);
777 double siz = (size >> 4) * exp10((double) (size & 0xF));
778 double hor = (horiz_pre >> 4) * exp10((double) (horiz_pre & 0xF));
779 double ver = (vert_pre >> 4) * exp10((double) (vert_pre & 0xF));
780
781 if (asprintf(&s, "%d %d %.3f %c %d %d %.3f %c %.2fm %.2fm %.2fm %.2fm",
782 (lat / 60000 / 60),
783 (lat / 60000) % 60,
784 (lat % 60000) / 1000.,
785 NS,
786 (lon / 60000 / 60),
787 (lon / 60000) % 60,
788 (lon % 60000) / 1000.,
789 EW,
790 alt / 100.,
791 siz / 100.,
792 hor / 100.,
793 ver / 100.) < 0)
794 return NULL;
795
796 return s;
797}
798
799static int format_timestamp_dns(char *buf, size_t l, time_t sec) {
800 struct tm tm;
801 int r;
802
803 assert(buf);
804 assert(l > STRLEN("YYYYMMDDHHmmSS"));
805
806 r = localtime_or_gmtime_usec(sec * USEC_PER_SEC, /* utc= */ true, &tm);
807 if (r < 0)
808 return r;
809
810 if (strftime(buf, l, "%Y%m%d%H%M%S", &tm) <= 0)
811 return -EINVAL;
812
813 return 0;
814}
815
816static char *format_types(Bitmap *types) {
817 _cleanup_strv_free_ char **strv = NULL;
818 _cleanup_free_ char *str = NULL;
819 unsigned type;
820 int r;
821
822 BITMAP_FOREACH(type, types) {
823 if (dns_type_to_string(type)) {
824 r = strv_extend(&strv, dns_type_to_string(type));
825 if (r < 0)
826 return NULL;
827 } else {
828 char *t;
829
830 r = asprintf(&t, "TYPE%u", type);
831 if (r < 0)
832 return NULL;
833
834 r = strv_consume(&strv, t);
835 if (r < 0)
836 return NULL;
837 }
838 }
839
840 str = strv_join(strv, " ");
841 if (!str)
842 return NULL;
843
844 return strjoin("( ", str, " )");
845}
846
847static char *format_txt(DnsTxtItem *first) {
848 size_t c = 1;
849 char *p, *s;
850
851 LIST_FOREACH(items, i, first)
852 c += i->length * 4 + 3;
853
854 p = s = new(char, c);
855 if (!s)
856 return NULL;
857
858 LIST_FOREACH(items, i, first) {
859 if (i != first)
860 *(p++) = ' ';
861
862 *(p++) = '"';
863
864 for (size_t j = 0; j < i->length; j++) {
865 if (i->data[j] < ' ' || i->data[j] == '"' || i->data[j] >= 127) {
866 *(p++) = '\\';
867 *(p++) = '0' + (i->data[j] / 100);
868 *(p++) = '0' + ((i->data[j] / 10) % 10);
869 *(p++) = '0' + (i->data[j] % 10);
870 } else
871 *(p++) = i->data[j];
872 }
873
874 *(p++) = '"';
875 }
876
877 *p = 0;
878 return s;
879}
880
881static char *format_svc_param_value(DnsSvcParam *i) {
882 _cleanup_free_ char *value = NULL;
883
884 assert(i);
885
886 switch (i->key) {
887 case DNS_SVC_PARAM_KEY_ALPN: {
888 size_t offset = 0;
889 _cleanup_strv_free_ char **values_strv = NULL;
890 while (offset < i->length) {
891 size_t sz = (uint8_t) i->value[offset++];
892
893 char *alpn = cescape_length((char *)&i->value[offset], sz);
894 if (!alpn)
895 return NULL;
896
897 if (strv_push(&values_strv, alpn) < 0)
898 return NULL;
899
900 offset += sz;
901 }
902 value = strv_join(values_strv, ",");
903 if (!value)
904 return NULL;
905 break;
906
907 }
908 case DNS_SVC_PARAM_KEY_PORT: {
909 uint16_t port = unaligned_read_be16(i->value);
910 if (asprintf(&value, "%" PRIu16, port) < 0)
911 return NULL;
912 return TAKE_PTR(value);
913 }
914 case DNS_SVC_PARAM_KEY_IPV4HINT: {
915 const struct in_addr *addrs = i->value_in_addr;
916 _cleanup_strv_free_ char **values_strv = NULL;
917 for (size_t n = 0; n < i->length / sizeof (struct in_addr); n++) {
918 char *addr;
919 if (in_addr_to_string(AF_INET, (const union in_addr_union*) &addrs[n], &addr) < 0)
920 return NULL;
921 if (strv_push(&values_strv, addr) < 0)
922 return NULL;
923 }
924 return strv_join(values_strv, ",");
925 }
926 case DNS_SVC_PARAM_KEY_IPV6HINT: {
927 const struct in6_addr *addrs = i->value_in6_addr;
928 _cleanup_strv_free_ char **values_strv = NULL;
929 for (size_t n = 0; n < i->length / sizeof (struct in6_addr); n++) {
930 char *addr;
931 if (in_addr_to_string(AF_INET6, (const union in_addr_union*) &addrs[n], &addr) < 0)
932 return NULL;
933 if (strv_push(&values_strv, addr) < 0)
934 return NULL;
935 }
936 return strv_join(values_strv, ",");
937 }
938 default:
939 value = decescape((char*) &i->value, i->length, " ,");
940 if (!value)
941 return NULL;
942 }
943
944 char *qvalue;
945 if (asprintf(&qvalue, "\"%s\"", value) < 0)
946 return NULL;
947 return qvalue;
948}
949
950static char *format_svc_param(DnsSvcParam *i) {
951 const char *key = FORMAT_DNS_SVC_PARAM_KEY(i->key);
952 _cleanup_free_ char *value = NULL;
953
954 assert(i);
955
956 if (i->length == 0)
957 return strdup(key);
958
959 value = format_svc_param_value(i);
960 if (!value)
961 return NULL;
962
963 return strjoin(key, "=", value);
964}
965
966static char *format_svc_params(DnsSvcParam *first) {
967 _cleanup_strv_free_ char **params = NULL;
968
969 LIST_FOREACH(params, i, first) {
970 char *param = format_svc_param(i);
971 if (!param)
972 return NULL;
973 if (strv_push(&params, param) < 0)
974 return NULL;
975 }
976
977 return strv_join(params, " ");
978}
979
980const char* dns_resource_record_to_string(DnsResourceRecord *rr) {
981 _cleanup_free_ char *s = NULL, *t = NULL;
982 char k[DNS_RESOURCE_KEY_STRING_MAX];
983 int r;
984
985 assert(rr);
986
987 if (rr->to_string)
988 return rr->to_string;
989
990 dns_resource_key_to_string(rr->key, k, sizeof(k));
991
992 switch (rr->unparsable ? _DNS_TYPE_INVALID : rr->key->type) {
993
994 case DNS_TYPE_SRV:
995 r = asprintf(&s, "%s %u %u %u %s",
996 k,
997 rr->srv.priority,
998 rr->srv.weight,
999 rr->srv.port,
1000 strna(rr->srv.name));
1001 if (r < 0)
1002 return NULL;
1003 break;
1004
1005 case DNS_TYPE_PTR:
1006 case DNS_TYPE_NS:
1007 case DNS_TYPE_CNAME:
1008 case DNS_TYPE_DNAME:
1009 s = strjoin(k, " ", rr->ptr.name);
1010 if (!s)
1011 return NULL;
1012
1013 break;
1014
1015 case DNS_TYPE_HINFO:
1016 s = strjoin(k, " ", rr->hinfo.cpu, " ", rr->hinfo.os);
1017 if (!s)
1018 return NULL;
1019 break;
1020
1021 case DNS_TYPE_SPF: /* exactly the same as TXT */
1022 case DNS_TYPE_TXT:
1023 t = format_txt(rr->txt.items);
1024 if (!t)
1025 return NULL;
1026
1027 s = strjoin(k, " ", t);
1028 if (!s)
1029 return NULL;
1030 break;
1031
1032 case DNS_TYPE_A:
1033 r = in_addr_to_string(AF_INET, (const union in_addr_union*) &rr->a.in_addr, &t);
1034 if (r < 0)
1035 return NULL;
1036
1037 s = strjoin(k, " ", t);
1038 if (!s)
1039 return NULL;
1040 break;
1041
1042 case DNS_TYPE_AAAA:
1043 r = in_addr_to_string(AF_INET6, (const union in_addr_union*) &rr->aaaa.in6_addr, &t);
1044 if (r < 0)
1045 return NULL;
1046
1047 s = strjoin(k, " ", t);
1048 if (!s)
1049 return NULL;
1050 break;
1051
1052 case DNS_TYPE_SOA:
1053 r = asprintf(&s, "%s %s %s %u %u %u %u %u",
1054 k,
1055 strna(rr->soa.mname),
1056 strna(rr->soa.rname),
1057 rr->soa.serial,
1058 rr->soa.refresh,
1059 rr->soa.retry,
1060 rr->soa.expire,
1061 rr->soa.minimum);
1062 if (r < 0)
1063 return NULL;
1064 break;
1065
1066 case DNS_TYPE_MX:
1067 r = asprintf(&s, "%s %u %s",
1068 k,
1069 rr->mx.priority,
1070 rr->mx.exchange);
1071 if (r < 0)
1072 return NULL;
1073 break;
1074
1075 case DNS_TYPE_LOC:
1076 assert(rr->loc.version == 0);
1077
1078 t = format_location(rr->loc.latitude,
1079 rr->loc.longitude,
1080 rr->loc.altitude,
1081 rr->loc.size,
1082 rr->loc.horiz_pre,
1083 rr->loc.vert_pre);
1084 if (!t)
1085 return NULL;
1086
1087 s = strjoin(k, " ", t);
1088 if (!s)
1089 return NULL;
1090 break;
1091
1092 case DNS_TYPE_DS:
1093 t = hexmem(rr->ds.digest, rr->ds.digest_size);
1094 if (!t)
1095 return NULL;
1096
1097 r = asprintf(&s, "%s %u %u %u %s",
1098 k,
1099 rr->ds.key_tag,
1100 rr->ds.algorithm,
1101 rr->ds.digest_type,
1102 t);
1103 if (r < 0)
1104 return NULL;
1105 break;
1106
1107 case DNS_TYPE_SSHFP: {
1108 _cleanup_free_ char *alg = NULL, *key_type = NULL;
1109
1110 t = hexmem(rr->sshfp.fingerprint, rr->sshfp.fingerprint_size);
1111 if (!t)
1112 return NULL;
1113
1114 r = sshfp_algorithm_to_string_alloc(rr->sshfp.algorithm, &alg);
1115 if (r < 0)
1116 return NULL;
1117
1118 r = sshfp_key_type_to_string_alloc(rr->sshfp.fptype, &key_type);
1119 if (r < 0)
1120 return NULL;
1121
1122 r = asprintf(&s, "%s "SSHFP_ALGORITHM_FMT" "SSHFP_KEY_TYPE_FMT" %s",
1123 k, alg, key_type, t);
1124 if (r < 0)
1125 return NULL;
1126 break;
1127 }
1128
1129 case DNS_TYPE_DNSKEY: {
1130 _cleanup_free_ char *alg = NULL;
1131 uint16_t key_tag;
1132
1133 key_tag = dnssec_keytag(rr, true);
1134
1135 r = dnssec_algorithm_to_string_alloc(rr->dnskey.algorithm, &alg);
1136 if (r < 0)
1137 return NULL;
1138
1139 r = asprintf(&t, "%s %u %u %s",
1140 k,
1141 rr->dnskey.flags,
1142 rr->dnskey.protocol,
1143 alg);
1144 if (r < 0)
1145 return NULL;
1146
1147 r = base64_append(&t, r,
1148 rr->dnskey.key, rr->dnskey.key_size,
1149 8, columns());
1150 if (r < 0)
1151 return NULL;
1152
1153 r = asprintf(&s, "%s\n"
1154 " -- Flags:%s%s%s\n"
1155 " -- Key tag: %u",
1156 t,
1157 rr->dnskey.flags & DNSKEY_FLAG_SEP ? " SEP" : "",
1158 rr->dnskey.flags & DNSKEY_FLAG_REVOKE ? " REVOKE" : "",
1159 rr->dnskey.flags & DNSKEY_FLAG_ZONE_KEY ? " ZONE_KEY" : "",
1160 key_tag);
1161 if (r < 0)
1162 return NULL;
1163
1164 break;
1165 }
1166
1167 case DNS_TYPE_RRSIG: {
1168 _cleanup_free_ char *alg = NULL;
1169 char expiration[STRLEN("YYYYMMDDHHmmSS") + 1], inception[STRLEN("YYYYMMDDHHmmSS") + 1];
1170 const char *type;
1171
1172 type = dns_type_to_string(rr->rrsig.type_covered);
1173
1174 r = dnssec_algorithm_to_string_alloc(rr->rrsig.algorithm, &alg);
1175 if (r < 0)
1176 return NULL;
1177
1178 r = format_timestamp_dns(expiration, sizeof(expiration), rr->rrsig.expiration);
1179 if (r < 0)
1180 return NULL;
1181
1182 r = format_timestamp_dns(inception, sizeof(inception), rr->rrsig.inception);
1183 if (r < 0)
1184 return NULL;
1185
1186 /* TYPE?? follows
1187 * http://tools.ietf.org/html/rfc3597#section-5 */
1188
1189 r = asprintf(&s, "%s %s%.*u %s %u %u %s %s %u %s",
1190 k,
1191 type ?: "TYPE",
1192 type ? 0 : 1, type ? 0u : (unsigned) rr->rrsig.type_covered,
1193 alg,
1194 rr->rrsig.labels,
1195 rr->rrsig.original_ttl,
1196 expiration,
1197 inception,
1198 rr->rrsig.key_tag,
1199 rr->rrsig.signer);
1200 if (r < 0)
1201 return NULL;
1202
1203 r = base64_append(&s, r,
1204 rr->rrsig.signature, rr->rrsig.signature_size,
1205 8, columns());
1206 if (r < 0)
1207 return NULL;
1208
1209 break;
1210 }
1211
1212 case DNS_TYPE_NSEC:
1213 t = format_types(rr->nsec.types);
1214 if (!t)
1215 return NULL;
1216
1217 r = asprintf(&s, "%s %s %s",
1218 k,
1219 rr->nsec.next_domain_name,
1220 t);
1221 if (r < 0)
1222 return NULL;
1223 break;
1224
1225 case DNS_TYPE_NSEC3: {
1226 _cleanup_free_ char *salt = NULL, *hash = NULL;
1227
1228 if (rr->nsec3.salt_size > 0) {
1229 salt = hexmem(rr->nsec3.salt, rr->nsec3.salt_size);
1230 if (!salt)
1231 return NULL;
1232 }
1233
1234 hash = base32hexmem(rr->nsec3.next_hashed_name, rr->nsec3.next_hashed_name_size, false);
1235 if (!hash)
1236 return NULL;
1237
1238 t = format_types(rr->nsec3.types);
1239 if (!t)
1240 return NULL;
1241
1242 r = asprintf(&s, "%s %"PRIu8" %"PRIu8" %"PRIu16" %s %s %s",
1243 k,
1244 rr->nsec3.algorithm,
1245 rr->nsec3.flags,
1246 rr->nsec3.iterations,
1247 rr->nsec3.salt_size > 0 ? salt : "-",
1248 hash,
1249 t);
1250 if (r < 0)
1251 return NULL;
1252
1253 break;
1254 }
1255
1256 case DNS_TYPE_TLSA:
1257 t = hexmem(rr->tlsa.data, rr->tlsa.data_size);
1258 if (!t)
1259 return NULL;
1260
1261 r = asprintf(&s,
1262 "%s %u %u %u %s\n"
1263 " -- Cert. usage: %s\n"
1264 " -- Selector: %s\n"
1265 " -- Matching type: %s",
1266 k,
1267 rr->tlsa.cert_usage,
1268 rr->tlsa.selector,
1269 rr->tlsa.matching_type,
1270 t,
1271 tlsa_cert_usage_to_string(rr->tlsa.cert_usage),
1272 tlsa_selector_to_string(rr->tlsa.selector),
1273 tlsa_matching_type_to_string(rr->tlsa.matching_type));
1274 if (r < 0)
1275 return NULL;
1276
1277 break;
1278
1279 case DNS_TYPE_CAA:
1280 t = octescape(rr->caa.value, rr->caa.value_size);
1281 if (!t)
1282 return NULL;
1283
1284 r = asprintf(&s, "%s %u %s \"%s\"%s%s%s%.0u",
1285 k,
1286 rr->caa.flags,
1287 rr->caa.tag,
1288 t,
1289 rr->caa.flags ? "\n -- Flags:" : "",
1290 rr->caa.flags & CAA_FLAG_CRITICAL ? " critical" : "",
1291 rr->caa.flags & ~CAA_FLAG_CRITICAL ? " " : "",
1292 rr->caa.flags & ~CAA_FLAG_CRITICAL);
1293 if (r < 0)
1294 return NULL;
1295
1296 break;
1297
1298 case DNS_TYPE_SVCB:
1299 case DNS_TYPE_HTTPS:
1300 t = format_svc_params(rr->svcb.params);
1301 if (!t)
1302 return NULL;
1303 r = asprintf(&s, "%s %d %s %s", k, rr->svcb.priority,
1304 isempty(rr->svcb.target_name) ? "." : rr->svcb.target_name,
1305 t);
1306 if (r < 0)
1307 return NULL;
1308
1309 break;
1310
1311 case DNS_TYPE_OPENPGPKEY:
1312 r = asprintf(&s, "%s", k);
1313 if (r < 0)
1314 return NULL;
1315
1316 r = base64_append(&s, r,
1317 rr->generic.data, rr->generic.data_size,
1318 8, columns());
1319 if (r < 0)
1320 return NULL;
1321 break;
1322
1323 case DNS_TYPE_NAPTR: {
1324 _cleanup_free_ char *tt = NULL, *ttt = NULL;
1325
1326 t = octescape(rr->naptr.flags, SIZE_MAX);
1327 if (!t)
1328 return NULL;
1329
1330 tt = octescape(rr->naptr.services, SIZE_MAX);
1331 if (!tt)
1332 return NULL;
1333
1334 ttt = octescape(rr->naptr.regexp, SIZE_MAX);
1335 if (!ttt)
1336 return NULL;
1337
1338 if (asprintf(&s, "%" PRIu16 " %" PRIu16 " \"%s\" \"%s\" \"%s\" %s.",
1339 rr->naptr.order,
1340 rr->naptr.preference,
1341 t,
1342 tt,
1343 ttt,
1344 rr->naptr.replacement) < 0)
1345 return NULL;
1346 break;
1347 }
1348 default:
1349 /* Format as documented in RFC 3597, Section 5 */
1350 if (rr->generic.data_size == 0)
1351 r = asprintf(&s, "%s \\# 0", k);
1352 else {
1353 t = hexmem(rr->generic.data, rr->generic.data_size);
1354 if (!t)
1355 return NULL;
1356 r = asprintf(&s, "%s \\# %zu %s", k, rr->generic.data_size, t);
1357 }
1358 if (r < 0)
1359 return NULL;
1360 }
1361
1362 rr->to_string = s;
1363 return TAKE_PTR(s);
1364}
1365
1366ssize_t dns_resource_record_payload(DnsResourceRecord *rr, const void **ret) {
1367 assert(rr);
1368 assert(ret);
1369
1370 switch (rr->unparsable ? _DNS_TYPE_INVALID : rr->key->type) {
1371 case DNS_TYPE_SRV:
1372 case DNS_TYPE_PTR:
1373 case DNS_TYPE_NS:
1374 case DNS_TYPE_CNAME:
1375 case DNS_TYPE_DNAME:
1376 case DNS_TYPE_HINFO:
1377 case DNS_TYPE_SPF:
1378 case DNS_TYPE_TXT:
1379 case DNS_TYPE_SOA:
1380 case DNS_TYPE_MX:
1381 case DNS_TYPE_LOC:
1382 case DNS_TYPE_DS:
1383 case DNS_TYPE_DNSKEY:
1384 case DNS_TYPE_RRSIG:
1385 case DNS_TYPE_NSEC:
1386 case DNS_TYPE_NSEC3:
1387 return -EINVAL;
1388
1389 case DNS_TYPE_A:
1390 *ret = &rr->a.in_addr;
1391 return sizeof(rr->a.in_addr);
1392
1393 case DNS_TYPE_AAAA:
1394 *ret = &rr->aaaa.in6_addr;
1395 return sizeof(rr->aaaa.in6_addr);
1396
1397 case DNS_TYPE_SSHFP:
1398 *ret = rr->sshfp.fingerprint;
1399 return rr->sshfp.fingerprint_size;
1400
1401 case DNS_TYPE_TLSA:
1402 *ret = rr->tlsa.data;
1403 return rr->tlsa.data_size;
1404
1405 case DNS_TYPE_OPENPGPKEY:
1406 default:
1407 *ret = rr->generic.data;
1408 return rr->generic.data_size;
1409 }
1410}
1411
1412int dns_resource_record_to_wire_format(DnsResourceRecord *rr, bool canonical) {
1413
1414 _cleanup_(dns_packet_unref) DnsPacket packet = {
1415 .n_ref = 1,
1416 .protocol = DNS_PROTOCOL_DNS,
1417 .on_stack = true,
1418 .refuse_compression = true,
1419 .canonical_form = canonical,
1420 };
1421
1422 size_t start, rds;
1423 int r;
1424
1425 assert(rr);
1426
1427 /* Generates the RR in wire-format, optionally in the
1428 * canonical form as discussed in the DNSSEC RFC 4034, Section
1429 * 6.2. We allocate a throw-away DnsPacket object on the stack
1430 * here, because we need some book-keeping for memory
1431 * management, and can reuse the DnsPacket serializer, that
1432 * can generate the canonical form, too, but also knows label
1433 * compression and suchlike. */
1434
1435 if (rr->wire_format && rr->wire_format_canonical == canonical)
1436 return 0;
1437
1438 r = dns_packet_append_rr(&packet, rr, 0, &start, &rds);
1439 if (r < 0)
1440 return r;
1441
1442 assert(start == 0);
1443 assert(packet._data);
1444
1445 free(rr->wire_format);
1446 rr->wire_format = TAKE_PTR(packet._data);
1447 rr->wire_format_size = packet.size;
1448 rr->wire_format_rdata_offset = rds;
1449 rr->wire_format_canonical = canonical;
1450
1451 return 0;
1452}
1453
1454int dns_resource_record_signer(DnsResourceRecord *rr, const char **ret) {
1455 const char *n;
1456 int r;
1457
1458 assert(rr);
1459 assert(ret);
1460
1461 /* Returns the RRset's signer, if it is known. */
1462
1463 if (rr->n_skip_labels_signer == UINT8_MAX)
1464 return -ENODATA;
1465
1466 n = dns_resource_key_name(rr->key);
1467 r = dns_name_skip(n, rr->n_skip_labels_signer, &n);
1468 if (r < 0)
1469 return r;
1470 if (r == 0)
1471 return -EINVAL;
1472
1473 *ret = n;
1474 return 0;
1475}
1476
1477int dns_resource_record_source(DnsResourceRecord *rr, const char **ret) {
1478 const char *n;
1479 int r;
1480
1481 assert(rr);
1482 assert(ret);
1483
1484 /* Returns the RRset's synthesizing source, if it is known. */
1485
1486 if (rr->n_skip_labels_source == UINT8_MAX)
1487 return -ENODATA;
1488
1489 n = dns_resource_key_name(rr->key);
1490 r = dns_name_skip(n, rr->n_skip_labels_source, &n);
1491 if (r < 0)
1492 return r;
1493 if (r == 0)
1494 return -EINVAL;
1495
1496 *ret = n;
1497 return 0;
1498}
1499
1500int dns_resource_record_is_signer(DnsResourceRecord *rr, const char *zone) {
1501 const char *signer;
1502 int r;
1503
1504 assert(rr);
1505
1506 r = dns_resource_record_signer(rr, &signer);
1507 if (r < 0)
1508 return r;
1509
1510 return dns_name_equal(zone, signer);
1511}
1512
1513int dns_resource_record_is_synthetic(DnsResourceRecord *rr) {
1514 int r;
1515
1516 assert(rr);
1517
1518 /* Returns > 0 if the RR is generated from a wildcard, and is not the asterisk name itself */
1519
1520 if (rr->n_skip_labels_source == UINT8_MAX)
1521 return -ENODATA;
1522
1523 if (rr->n_skip_labels_source == 0)
1524 return 0;
1525
1526 if (rr->n_skip_labels_source > 1)
1527 return 1;
1528
1529 r = dns_name_startswith(dns_resource_key_name(rr->key), "*");
1530 if (r < 0)
1531 return r;
1532
1533 return !r;
1534}
1535
1536void dns_resource_record_hash_func(const DnsResourceRecord *rr, struct siphash *state) {
1537 assert(rr);
1538
1539 dns_resource_key_hash_func(rr->key, state);
1540
1541 switch (rr->unparsable ? _DNS_TYPE_INVALID : rr->key->type) {
1542
1543 case DNS_TYPE_SRV:
1544 siphash24_compress_typesafe(rr->srv.priority, state);
1545 siphash24_compress_typesafe(rr->srv.weight, state);
1546 siphash24_compress_typesafe(rr->srv.port, state);
1547 dns_name_hash_func(rr->srv.name, state);
1548 break;
1549
1550 case DNS_TYPE_PTR:
1551 case DNS_TYPE_NS:
1552 case DNS_TYPE_CNAME:
1553 case DNS_TYPE_DNAME:
1554 dns_name_hash_func(rr->ptr.name, state);
1555 break;
1556
1557 case DNS_TYPE_HINFO:
1558 string_hash_func(rr->hinfo.cpu, state);
1559 string_hash_func(rr->hinfo.os, state);
1560 break;
1561
1562 case DNS_TYPE_TXT:
1563 case DNS_TYPE_SPF: {
1564 LIST_FOREACH(items, j, rr->txt.items) {
1565 siphash24_compress_safe(j->data, j->length, state);
1566
1567 /* Add an extra NUL byte, so that "a" followed by "b" doesn't result in the same hash as "ab"
1568 * followed by "". */
1569 siphash24_compress_byte(0, state);
1570 }
1571 break;
1572 }
1573
1574 case DNS_TYPE_A:
1575 siphash24_compress_typesafe(rr->a.in_addr, state);
1576 break;
1577
1578 case DNS_TYPE_AAAA:
1579 siphash24_compress_typesafe(rr->aaaa.in6_addr, state);
1580 break;
1581
1582 case DNS_TYPE_SOA:
1583 dns_name_hash_func(rr->soa.mname, state);
1584 dns_name_hash_func(rr->soa.rname, state);
1585 siphash24_compress_typesafe(rr->soa.serial, state);
1586 siphash24_compress_typesafe(rr->soa.refresh, state);
1587 siphash24_compress_typesafe(rr->soa.retry, state);
1588 siphash24_compress_typesafe(rr->soa.expire, state);
1589 siphash24_compress_typesafe(rr->soa.minimum, state);
1590 break;
1591
1592 case DNS_TYPE_MX:
1593 siphash24_compress_typesafe(rr->mx.priority, state);
1594 dns_name_hash_func(rr->mx.exchange, state);
1595 break;
1596
1597 case DNS_TYPE_LOC:
1598 siphash24_compress_typesafe(rr->loc.version, state);
1599 siphash24_compress_typesafe(rr->loc.size, state);
1600 siphash24_compress_typesafe(rr->loc.horiz_pre, state);
1601 siphash24_compress_typesafe(rr->loc.vert_pre, state);
1602 siphash24_compress_typesafe(rr->loc.latitude, state);
1603 siphash24_compress_typesafe(rr->loc.longitude, state);
1604 siphash24_compress_typesafe(rr->loc.altitude, state);
1605 break;
1606
1607 case DNS_TYPE_SSHFP:
1608 siphash24_compress_typesafe(rr->sshfp.algorithm, state);
1609 siphash24_compress_typesafe(rr->sshfp.fptype, state);
1610 siphash24_compress_safe(rr->sshfp.fingerprint, rr->sshfp.fingerprint_size, state);
1611 break;
1612
1613 case DNS_TYPE_DNSKEY:
1614 siphash24_compress_typesafe(rr->dnskey.flags, state);
1615 siphash24_compress_typesafe(rr->dnskey.protocol, state);
1616 siphash24_compress_typesafe(rr->dnskey.algorithm, state);
1617 siphash24_compress_safe(rr->dnskey.key, rr->dnskey.key_size, state);
1618 break;
1619
1620 case DNS_TYPE_RRSIG:
1621 siphash24_compress_typesafe(rr->rrsig.type_covered, state);
1622 siphash24_compress_typesafe(rr->rrsig.algorithm, state);
1623 siphash24_compress_typesafe(rr->rrsig.labels, state);
1624 siphash24_compress_typesafe(rr->rrsig.original_ttl, state);
1625 siphash24_compress_typesafe(rr->rrsig.expiration, state);
1626 siphash24_compress_typesafe(rr->rrsig.inception, state);
1627 siphash24_compress_typesafe(rr->rrsig.key_tag, state);
1628 dns_name_hash_func(rr->rrsig.signer, state);
1629 siphash24_compress_safe(rr->rrsig.signature, rr->rrsig.signature_size, state);
1630 break;
1631
1632 case DNS_TYPE_NSEC:
1633 dns_name_hash_func(rr->nsec.next_domain_name, state);
1634 /* FIXME: we leave out the type bitmap here. Hash
1635 * would be better if we'd take it into account
1636 * too. */
1637 break;
1638
1639 case DNS_TYPE_DS:
1640 siphash24_compress_typesafe(rr->ds.key_tag, state);
1641 siphash24_compress_typesafe(rr->ds.algorithm, state);
1642 siphash24_compress_typesafe(rr->ds.digest_type, state);
1643 siphash24_compress_safe(rr->ds.digest, rr->ds.digest_size, state);
1644 break;
1645
1646 case DNS_TYPE_NSEC3:
1647 siphash24_compress_typesafe(rr->nsec3.algorithm, state);
1648 siphash24_compress_typesafe(rr->nsec3.flags, state);
1649 siphash24_compress_typesafe(rr->nsec3.iterations, state);
1650 siphash24_compress_safe(rr->nsec3.salt, rr->nsec3.salt_size, state);
1651 siphash24_compress_safe(rr->nsec3.next_hashed_name, rr->nsec3.next_hashed_name_size, state);
1652 /* FIXME: We leave the bitmaps out */
1653 break;
1654
1655 case DNS_TYPE_TLSA:
1656 siphash24_compress_typesafe(rr->tlsa.cert_usage, state);
1657 siphash24_compress_typesafe(rr->tlsa.selector, state);
1658 siphash24_compress_typesafe(rr->tlsa.matching_type, state);
1659 siphash24_compress_safe(rr->tlsa.data, rr->tlsa.data_size, state);
1660 break;
1661
1662 case DNS_TYPE_SVCB:
1663 case DNS_TYPE_HTTPS:
1664 dns_name_hash_func(rr->svcb.target_name, state);
1665 siphash24_compress_typesafe(rr->svcb.priority, state);
1666 LIST_FOREACH(params, j, rr->svcb.params) {
1667 siphash24_compress_typesafe(j->key, state);
1668 siphash24_compress_safe(j->value, j->length, state);
1669 }
1670 break;
1671
1672 case DNS_TYPE_CAA:
1673 siphash24_compress_typesafe(rr->caa.flags, state);
1674 string_hash_func(rr->caa.tag, state);
1675 siphash24_compress_safe(rr->caa.value, rr->caa.value_size, state);
1676 break;
1677
1678 case DNS_TYPE_NAPTR:
1679 siphash24_compress_typesafe(rr->naptr.order, state);
1680 siphash24_compress_typesafe(rr->naptr.preference, state);
1681 string_hash_func(rr->naptr.flags, state);
1682 string_hash_func(rr->naptr.services, state);
1683 string_hash_func(rr->naptr.regexp, state);
1684 dns_name_hash_func(rr->naptr.replacement, state);
1685 break;
1686
1687 case DNS_TYPE_OPENPGPKEY:
1688 default:
1689 siphash24_compress_safe(rr->generic.data, rr->generic.data_size, state);
1690 }
1691}
1692
1693int dns_resource_record_compare_func(const DnsResourceRecord *x, const DnsResourceRecord *y) {
1694 int r;
1695
1696 r = dns_resource_key_compare_func(x->key, y->key);
1697 if (r != 0)
1698 return r;
1699
1700 if (dns_resource_record_payload_equal(x, y) > 0)
1701 return 0;
1702
1703 /* We still use CMP() here, even though don't implement proper
1704 * ordering, since the hashtable doesn't need ordering anyway. */
1705 return CMP(x, y);
1706}
1707
1708DEFINE_HASH_OPS_WITH_KEY_DESTRUCTOR(
1709 dns_resource_record_hash_ops,
1710 DnsResourceRecord,
1711 dns_resource_record_hash_func,
1712 dns_resource_record_compare_func,
1713 dns_resource_record_unref);
1714
1715DEFINE_HASH_OPS_FULL(
1716 dns_resource_record_hash_ops_by_key,
1717 DnsResourceKey,
1718 dns_resource_key_hash_func,
1719 dns_resource_key_compare_func,
1720 dns_resource_key_unref,
1721 DnsResourceRecord,
1722 dns_resource_record_unref);
1723
1724DnsResourceRecord *dns_resource_record_copy(DnsResourceRecord *rr) {
1725 _cleanup_(dns_resource_record_unrefp) DnsResourceRecord *copy = NULL;
1726 DnsResourceRecord *t;
1727
1728 assert(rr);
1729
1730 copy = dns_resource_record_new(rr->key);
1731 if (!copy)
1732 return NULL;
1733
1734 copy->ttl = rr->ttl;
1735 copy->expiry = rr->expiry;
1736 copy->n_skip_labels_signer = rr->n_skip_labels_signer;
1737 copy->n_skip_labels_source = rr->n_skip_labels_source;
1738 copy->unparsable = rr->unparsable;
1739
1740 switch (rr->unparsable ? _DNS_TYPE_INVALID : rr->key->type) {
1741
1742 case DNS_TYPE_SRV:
1743 copy->srv.priority = rr->srv.priority;
1744 copy->srv.weight = rr->srv.weight;
1745 copy->srv.port = rr->srv.port;
1746 copy->srv.name = strdup(rr->srv.name);
1747 if (!copy->srv.name)
1748 return NULL;
1749 break;
1750
1751 case DNS_TYPE_PTR:
1752 case DNS_TYPE_NS:
1753 case DNS_TYPE_CNAME:
1754 case DNS_TYPE_DNAME:
1755 copy->ptr.name = strdup(rr->ptr.name);
1756 if (!copy->ptr.name)
1757 return NULL;
1758 break;
1759
1760 case DNS_TYPE_HINFO:
1761 copy->hinfo.cpu = strdup(rr->hinfo.cpu);
1762 if (!copy->hinfo.cpu)
1763 return NULL;
1764
1765 copy->hinfo.os = strdup(rr->hinfo.os);
1766 if (!copy->hinfo.os)
1767 return NULL;
1768 break;
1769
1770 case DNS_TYPE_TXT:
1771 case DNS_TYPE_SPF:
1772 copy->txt.items = dns_txt_item_copy(rr->txt.items);
1773 if (!copy->txt.items)
1774 return NULL;
1775 break;
1776
1777 case DNS_TYPE_A:
1778 copy->a = rr->a;
1779 break;
1780
1781 case DNS_TYPE_AAAA:
1782 copy->aaaa = rr->aaaa;
1783 break;
1784
1785 case DNS_TYPE_SOA:
1786 copy->soa.mname = strdup(rr->soa.mname);
1787 if (!copy->soa.mname)
1788 return NULL;
1789 copy->soa.rname = strdup(rr->soa.rname);
1790 if (!copy->soa.rname)
1791 return NULL;
1792 copy->soa.serial = rr->soa.serial;
1793 copy->soa.refresh = rr->soa.refresh;
1794 copy->soa.retry = rr->soa.retry;
1795 copy->soa.expire = rr->soa.expire;
1796 copy->soa.minimum = rr->soa.minimum;
1797 break;
1798
1799 case DNS_TYPE_MX:
1800 copy->mx.priority = rr->mx.priority;
1801 copy->mx.exchange = strdup(rr->mx.exchange);
1802 if (!copy->mx.exchange)
1803 return NULL;
1804 break;
1805
1806 case DNS_TYPE_LOC:
1807 copy->loc = rr->loc;
1808 break;
1809
1810 case DNS_TYPE_SSHFP:
1811 copy->sshfp.algorithm = rr->sshfp.algorithm;
1812 copy->sshfp.fptype = rr->sshfp.fptype;
1813 copy->sshfp.fingerprint = memdup(rr->sshfp.fingerprint, rr->sshfp.fingerprint_size);
1814 if (!copy->sshfp.fingerprint)
1815 return NULL;
1816 copy->sshfp.fingerprint_size = rr->sshfp.fingerprint_size;
1817 break;
1818
1819 case DNS_TYPE_DNSKEY:
1820 copy->dnskey.flags = rr->dnskey.flags;
1821 copy->dnskey.protocol = rr->dnskey.protocol;
1822 copy->dnskey.algorithm = rr->dnskey.algorithm;
1823 copy->dnskey.key = memdup(rr->dnskey.key, rr->dnskey.key_size);
1824 if (!copy->dnskey.key)
1825 return NULL;
1826 copy->dnskey.key_size = rr->dnskey.key_size;
1827 break;
1828
1829 case DNS_TYPE_RRSIG:
1830 copy->rrsig.type_covered = rr->rrsig.type_covered;
1831 copy->rrsig.algorithm = rr->rrsig.algorithm;
1832 copy->rrsig.labels = rr->rrsig.labels;
1833 copy->rrsig.original_ttl = rr->rrsig.original_ttl;
1834 copy->rrsig.expiration = rr->rrsig.expiration;
1835 copy->rrsig.inception = rr->rrsig.inception;
1836 copy->rrsig.key_tag = rr->rrsig.key_tag;
1837 copy->rrsig.signer = strdup(rr->rrsig.signer);
1838 if (!copy->rrsig.signer)
1839 return NULL;
1840 copy->rrsig.signature = memdup(rr->rrsig.signature, rr->rrsig.signature_size);
1841 if (!copy->rrsig.signature)
1842 return NULL;
1843 copy->rrsig.signature_size = rr->rrsig.signature_size;
1844 break;
1845
1846 case DNS_TYPE_NSEC:
1847 copy->nsec.next_domain_name = strdup(rr->nsec.next_domain_name);
1848 if (!copy->nsec.next_domain_name)
1849 return NULL;
1850 if (rr->nsec.types) {
1851 copy->nsec.types = bitmap_copy(rr->nsec.types);
1852 if (!copy->nsec.types)
1853 return NULL;
1854 }
1855 break;
1856
1857 case DNS_TYPE_DS:
1858 copy->ds.key_tag = rr->ds.key_tag;
1859 copy->ds.algorithm = rr->ds.algorithm;
1860 copy->ds.digest_type = rr->ds.digest_type;
1861 copy->ds.digest = memdup(rr->ds.digest, rr->ds.digest_size);
1862 if (!copy->ds.digest)
1863 return NULL;
1864 copy->ds.digest_size = rr->ds.digest_size;
1865 break;
1866
1867 case DNS_TYPE_NSEC3:
1868 copy->nsec3.algorithm = rr->nsec3.algorithm;
1869 copy->nsec3.flags = rr->nsec3.flags;
1870 copy->nsec3.iterations = rr->nsec3.iterations;
1871 copy->nsec3.salt = memdup(rr->nsec3.salt, rr->nsec3.salt_size);
1872 if (!copy->nsec3.salt)
1873 return NULL;
1874 copy->nsec3.salt_size = rr->nsec3.salt_size;
1875 copy->nsec3.next_hashed_name = memdup(rr->nsec3.next_hashed_name, rr->nsec3.next_hashed_name_size);
1876 if (!copy->nsec3.next_hashed_name)
1877 return NULL;
1878 copy->nsec3.next_hashed_name_size = rr->nsec3.next_hashed_name_size;
1879 if (rr->nsec3.types) {
1880 copy->nsec3.types = bitmap_copy(rr->nsec3.types);
1881 if (!copy->nsec3.types)
1882 return NULL;
1883 }
1884 break;
1885
1886 case DNS_TYPE_TLSA:
1887 copy->tlsa.cert_usage = rr->tlsa.cert_usage;
1888 copy->tlsa.selector = rr->tlsa.selector;
1889 copy->tlsa.matching_type = rr->tlsa.matching_type;
1890 copy->tlsa.data = memdup(rr->tlsa.data, rr->tlsa.data_size);
1891 if (!copy->tlsa.data)
1892 return NULL;
1893 copy->tlsa.data_size = rr->tlsa.data_size;
1894 break;
1895
1896 case DNS_TYPE_CAA:
1897 copy->caa.flags = rr->caa.flags;
1898 copy->caa.tag = strdup(rr->caa.tag);
1899 if (!copy->caa.tag)
1900 return NULL;
1901 copy->caa.value = memdup(rr->caa.value, rr->caa.value_size);
1902 if (!copy->caa.value)
1903 return NULL;
1904 copy->caa.value_size = rr->caa.value_size;
1905 break;
1906
1907 case DNS_TYPE_SVCB:
1908 case DNS_TYPE_HTTPS:
1909 copy->svcb.priority = rr->svcb.priority;
1910 copy->svcb.target_name = strdup(rr->svcb.target_name);
1911 if (!copy->svcb.target_name)
1912 return NULL;
1913 copy->svcb.params = dns_svc_params_copy(rr->svcb.params);
1914 if (rr->svcb.params && !copy->svcb.params)
1915 return NULL;
1916 break;
1917
1918 case DNS_TYPE_NAPTR:
1919 copy->naptr.order = rr->naptr.order;
1920 copy->naptr.preference = rr->naptr.preference;
1921 copy->naptr.flags = strdup(rr->naptr.flags);
1922 if (!copy->naptr.flags)
1923 return NULL;
1924 copy->naptr.services = strdup(rr->naptr.services);
1925 if (!copy->naptr.services)
1926 return NULL;
1927 copy->naptr.regexp = strdup(rr->naptr.regexp);
1928 if (!copy->naptr.regexp)
1929 return NULL;
1930 copy->naptr.replacement = strdup(rr->naptr.replacement);
1931 if (!copy->naptr.replacement)
1932 return NULL;
1933 break;
1934
1935 case DNS_TYPE_OPT:
1936 default:
1937 copy->generic.data = memdup(rr->generic.data, rr->generic.data_size);
1938 if (!copy->generic.data)
1939 return NULL;
1940 copy->generic.data_size = rr->generic.data_size;
1941 }
1942
1943 t = TAKE_PTR(copy);
1944
1945 return t;
1946}
1947
1948int dns_resource_record_clamp_ttl(DnsResourceRecord **rr, uint32_t max_ttl) {
1949 DnsResourceRecord *old_rr, *new_rr;
1950 uint32_t new_ttl;
1951
1952 assert(rr);
1953 old_rr = *rr;
1954
1955 if (old_rr->key->type == DNS_TYPE_OPT)
1956 return -EINVAL;
1957
1958 new_ttl = MIN(old_rr->ttl, max_ttl);
1959 if (new_ttl == old_rr->ttl)
1960 return 0;
1961
1962 if (old_rr->n_ref == 1) {
1963 /* Patch in place */
1964 old_rr->ttl = new_ttl;
1965 return 1;
1966 }
1967
1968 new_rr = dns_resource_record_copy(old_rr);
1969 if (!new_rr)
1970 return -ENOMEM;
1971
1972 new_rr->ttl = new_ttl;
1973
1974 DNS_RR_REPLACE(*rr, new_rr);
1975 return 1;
1976}
1977
1978bool dns_resource_record_is_link_local_address(DnsResourceRecord *rr) {
1979 assert(rr);
1980
1981 if (rr->key->class != DNS_CLASS_IN)
1982 return false;
1983
1984 if (rr->key->type == DNS_TYPE_A)
1985 return in4_addr_is_link_local(&rr->a.in_addr);
1986
1987 if (rr->key->type == DNS_TYPE_AAAA)
1988 return in6_addr_is_link_local(&rr->aaaa.in6_addr);
1989
1990 return false;
1991}
1992
1993int dns_resource_record_get_cname_target(DnsResourceKey *key, DnsResourceRecord *cname, char **ret) {
1994 _cleanup_free_ char *d = NULL;
1995 int r;
1996
1997 assert(key);
1998 assert(cname);
1999
2000 /* Checks if the RR `cname` is a CNAME/DNAME RR that matches the specified `key`. If so, returns the
2001 * target domain. If not, returns -EUNATCH */
2002
2003 if (key->class != cname->key->class && key->class != DNS_CLASS_ANY)
2004 return -EUNATCH;
2005
2006 if (!dns_type_may_redirect(key->type)) /* This key type is not subject to CNAME/DNAME redirection?
2007 * Then let's refuse right-away */
2008 return -EUNATCH;
2009
2010 if (cname->key->type == DNS_TYPE_CNAME) {
2011 r = dns_name_equal(dns_resource_key_name(key),
2012 dns_resource_key_name(cname->key));
2013 if (r < 0)
2014 return r;
2015 if (r == 0)
2016 return -EUNATCH; /* CNAME RR key doesn't actually match the original key */
2017
2018 d = strdup(cname->cname.name);
2019 if (!d)
2020 return -ENOMEM;
2021
2022 } else if (cname->key->type == DNS_TYPE_DNAME) {
2023
2024 r = dns_name_change_suffix(
2025 dns_resource_key_name(key),
2026 dns_resource_key_name(cname->key),
2027 cname->dname.name,
2028 &d);
2029 if (r < 0)
2030 return r;
2031 if (r == 0)
2032 return -EUNATCH; /* DNAME RR key doesn't actually match the original key */
2033
2034 } else
2035 return -EUNATCH; /* Not a CNAME/DNAME RR, hence doesn't match the proposition either */
2036
2037 *ret = TAKE_PTR(d);
2038 return 0;
2039}
2040
2041DnsTxtItem *dns_txt_item_free_all(DnsTxtItem *first) {
2042 LIST_FOREACH(items, i, first)
2043 free(i);
2044
2045 return NULL;
2046}
2047
2048DnsSvcParam *dns_svc_param_free_all(DnsSvcParam *first) {
2049 LIST_FOREACH(params, i, first)
2050 free(i);
2051
2052 return NULL;
2053}
2054
2055bool dns_txt_item_equal(DnsTxtItem *a, DnsTxtItem *b) {
2056 DnsTxtItem *bb = b;
2057
2058 if (a == b)
2059 return true;
2060
2061 LIST_FOREACH(items, aa, a) {
2062 if (!bb)
2063 return false;
2064
2065 if (memcmp_nn(aa->data, aa->length, bb->data, bb->length) != 0)
2066 return false;
2067
2068 bb = bb->items_next;
2069 }
2070
2071 return !bb;
2072}
2073
2074DnsTxtItem *dns_txt_item_copy(DnsTxtItem *first) {
2075 DnsTxtItem *copy = NULL, *end = NULL;
2076
2077 LIST_FOREACH(items, i, first) {
2078 DnsTxtItem *j;
2079
2080 j = memdup(i, offsetof(DnsTxtItem, data) + i->length + 1);
2081 if (!j)
2082 return dns_txt_item_free_all(copy);
2083
2084 LIST_INSERT_AFTER(items, copy, end, j);
2085 end = j;
2086 }
2087
2088 return copy;
2089}
2090
2091bool dns_svc_params_equal(DnsSvcParam *a, DnsSvcParam *b) {
2092 DnsSvcParam *bb = b;
2093
2094 if (a == b)
2095 return true;
2096
2097 LIST_FOREACH(params, aa, a) {
2098 if (!bb)
2099 return false;
2100
2101 if (aa->key != bb->key)
2102 return false;
2103
2104 if (memcmp_nn(aa->value, aa->length, bb->value, bb->length) != 0)
2105 return false;
2106
2107 bb = bb->params_next;
2108 }
2109
2110 return !bb;
2111}
2112
2113DnsSvcParam *dns_svc_params_copy(DnsSvcParam *first) {
2114 DnsSvcParam *copy = NULL, *end = NULL;
2115
2116 LIST_FOREACH(params, i, first) {
2117 DnsSvcParam *j;
2118
2119 j = memdup(i, offsetof(DnsSvcParam, value) + i->length);
2120 if (!j)
2121 return dns_svc_param_free_all(copy);
2122
2123 LIST_INSERT_AFTER(params, copy, end, j);
2124 end = j;
2125 }
2126
2127 return copy;
2128}
2129
2130int dns_txt_item_new_empty(DnsTxtItem **ret) {
2131 DnsTxtItem *i;
2132
2133 assert(ret);
2134
2135 /* RFC 6763, section 6.1 suggests to treat
2136 * empty TXT RRs as equivalent to a TXT record
2137 * with a single empty string. */
2138
2139 i = malloc0(offsetof(DnsTxtItem, data) + 1); /* for safety reasons we add an extra NUL byte */
2140 if (!i)
2141 return -ENOMEM;
2142
2143 *ret = i;
2144 return 0;
2145}
2146
2147int dns_resource_record_new_from_raw(DnsResourceRecord **ret, const void *data, size_t size) {
2148 _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL;
2149 int r;
2150
2151 r = dns_packet_new(&p, DNS_PROTOCOL_DNS, 0, DNS_PACKET_SIZE_MAX);
2152 if (r < 0)
2153 return r;
2154
2155 p->refuse_compression = true;
2156
2157 r = dns_packet_append_blob(p, data, size, NULL);
2158 if (r < 0)
2159 return r;
2160
2161 return dns_packet_read_rr(p, ret, NULL, NULL);
2162}
2163
2164int dns_resource_key_to_json(DnsResourceKey *key, sd_json_variant **ret) {
2165 assert(key);
2166 assert(ret);
2167
2168 return sd_json_buildo(
2169 ret,
2170 SD_JSON_BUILD_PAIR("class", SD_JSON_BUILD_INTEGER(key->class)),
2171 SD_JSON_BUILD_PAIR("type", SD_JSON_BUILD_INTEGER(key->type)),
2172 SD_JSON_BUILD_PAIR("name", SD_JSON_BUILD_STRING(dns_resource_key_name(key))));
2173}
2174
2175int dns_resource_key_from_json(sd_json_variant *v, DnsResourceKey **ret) {
2176 struct params {
2177 uint16_t type;
2178 uint16_t class;
2179 const char *name;
2180 };
2181
2182 static const sd_json_dispatch_field dispatch_table[] = {
2183 { "class", _SD_JSON_VARIANT_TYPE_INVALID, sd_json_dispatch_uint16, offsetof(struct params, class), SD_JSON_MANDATORY },
2184 { "type", _SD_JSON_VARIANT_TYPE_INVALID, sd_json_dispatch_uint16, offsetof(struct params, type), SD_JSON_MANDATORY },
2185 { "name", SD_JSON_VARIANT_STRING, sd_json_dispatch_const_string, offsetof(struct params, name), SD_JSON_MANDATORY },
2186 {}
2187 };
2188
2189 _cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL;
2190 struct params p;
2191 int r;
2192
2193 assert(v);
2194 assert(ret);
2195
2196 r = sd_json_dispatch(v, dispatch_table, 0, &p);
2197 if (r < 0)
2198 return r;
2199
2200 key = dns_resource_key_new(p.class, p.type, p.name);
2201 if (!key)
2202 return -ENOMEM;
2203
2204 *ret = TAKE_PTR(key);
2205 return 0;
2206}
2207
2208static int type_bitmap_to_json(Bitmap *b, sd_json_variant **ret) {
2209 _cleanup_(sd_json_variant_unrefp) sd_json_variant *l = NULL;
2210 unsigned t;
2211 int r;
2212
2213 assert(ret);
2214
2215 BITMAP_FOREACH(t, b) {
2216 _cleanup_(sd_json_variant_unrefp) sd_json_variant *v = NULL;
2217
2218 r = sd_json_variant_new_unsigned(&v, t);
2219 if (r < 0)
2220 return r;
2221
2222 r = sd_json_variant_append_array(&l, v);
2223 if (r < 0)
2224 return r;
2225 }
2226
2227 if (!l)
2228 return sd_json_variant_new_array(ret, NULL, 0);
2229
2230 *ret = TAKE_PTR(l);
2231 return 0;
2232}
2233
2234static int txt_to_json(DnsTxtItem *items, sd_json_variant **ret) {
2235 sd_json_variant **elements = NULL;
2236 size_t n = 0;
2237 int r;
2238
2239 assert(ret);
2240
2241 LIST_FOREACH(items, i, items) {
2242 if (!GREEDY_REALLOC(elements, n + 1)) {
2243 r = -ENOMEM;
2244 goto finalize;
2245 }
2246
2247 r = sd_json_variant_new_octescape(elements + n, i->data, i->length);
2248 if (r < 0)
2249 goto finalize;
2250
2251 n++;
2252 }
2253
2254 r = sd_json_variant_new_array(ret, elements, n);
2255
2256finalize:
2257 sd_json_variant_unref_many(elements, n);
2258 return r;
2259}
2260
2261static int svc_params_to_json(DnsSvcParam *params, sd_json_variant **ret) {
2262 _cleanup_(sd_json_variant_unrefp) sd_json_variant *w = NULL;
2263 int r;
2264
2265 assert(ret);
2266
2267 LIST_FOREACH(params, i, params) {
2268 _cleanup_(sd_json_variant_unrefp) sd_json_variant *v = NULL;
2269 r = sd_json_variant_new_base64(&v, i->value, i->length);
2270 if (r < 0)
2271 return r;
2272
2273 r = sd_json_variant_set_field(&w, FORMAT_DNS_SVC_PARAM_KEY(i->key), v);
2274 if (r < 0)
2275 return r;
2276 }
2277
2278 *ret = TAKE_PTR(w);
2279 return 0;
2280}
2281
2282int dns_resource_record_to_json(DnsResourceRecord *rr, sd_json_variant **ret) {
2283 _cleanup_(sd_json_variant_unrefp) sd_json_variant *k = NULL;
2284 int r;
2285
2286 assert(rr);
2287 assert(ret);
2288
2289 r = dns_resource_key_to_json(rr->key, &k);
2290 if (r < 0)
2291 return r;
2292
2293 switch (rr->unparsable ? _DNS_TYPE_INVALID : rr->key->type) {
2294
2295 case DNS_TYPE_SRV:
2296 return sd_json_buildo(
2297 ret,
2298 SD_JSON_BUILD_PAIR("key", SD_JSON_BUILD_VARIANT(k)),
2299 SD_JSON_BUILD_PAIR("priority", SD_JSON_BUILD_UNSIGNED(rr->srv.priority)),
2300 SD_JSON_BUILD_PAIR("weight", SD_JSON_BUILD_UNSIGNED(rr->srv.weight)),
2301 SD_JSON_BUILD_PAIR("port", SD_JSON_BUILD_UNSIGNED(rr->srv.port)),
2302 SD_JSON_BUILD_PAIR("name", SD_JSON_BUILD_STRING(rr->srv.name)));
2303
2304 case DNS_TYPE_PTR:
2305 case DNS_TYPE_NS:
2306 case DNS_TYPE_CNAME:
2307 case DNS_TYPE_DNAME:
2308 return sd_json_buildo(
2309 ret,
2310 SD_JSON_BUILD_PAIR("key", SD_JSON_BUILD_VARIANT(k)),
2311 SD_JSON_BUILD_PAIR("name", SD_JSON_BUILD_STRING(rr->ptr.name)));
2312
2313 case DNS_TYPE_HINFO:
2314 return sd_json_buildo(
2315 ret,
2316 SD_JSON_BUILD_PAIR("key", SD_JSON_BUILD_VARIANT(k)),
2317 SD_JSON_BUILD_PAIR("cpu", SD_JSON_BUILD_STRING(rr->hinfo.cpu)),
2318 SD_JSON_BUILD_PAIR("os", SD_JSON_BUILD_STRING(rr->hinfo.os)));
2319
2320 case DNS_TYPE_SPF:
2321 case DNS_TYPE_TXT: {
2322 _cleanup_(sd_json_variant_unrefp) sd_json_variant *l = NULL;
2323
2324 r = txt_to_json(rr->txt.items, &l);
2325 if (r < 0)
2326 return r;
2327
2328 return sd_json_buildo(
2329 ret,
2330 SD_JSON_BUILD_PAIR("key", SD_JSON_BUILD_VARIANT(k)),
2331 SD_JSON_BUILD_PAIR("items", SD_JSON_BUILD_VARIANT(l)));
2332 }
2333
2334 case DNS_TYPE_A:
2335 return sd_json_buildo(
2336 ret,
2337 SD_JSON_BUILD_PAIR("key", SD_JSON_BUILD_VARIANT(k)),
2338 SD_JSON_BUILD_PAIR("address", JSON_BUILD_IN4_ADDR(&rr->a.in_addr)));
2339
2340 case DNS_TYPE_AAAA:
2341 return sd_json_buildo(
2342 ret,
2343 SD_JSON_BUILD_PAIR("key", SD_JSON_BUILD_VARIANT(k)),
2344 SD_JSON_BUILD_PAIR("address", JSON_BUILD_IN6_ADDR(&rr->aaaa.in6_addr)));
2345
2346 case DNS_TYPE_SOA:
2347 return sd_json_buildo(
2348 ret,
2349 SD_JSON_BUILD_PAIR("key", SD_JSON_BUILD_VARIANT(k)),
2350 SD_JSON_BUILD_PAIR("mname", SD_JSON_BUILD_STRING(rr->soa.mname)),
2351 SD_JSON_BUILD_PAIR("rname", SD_JSON_BUILD_STRING(rr->soa.rname)),
2352 SD_JSON_BUILD_PAIR("serial", SD_JSON_BUILD_UNSIGNED(rr->soa.serial)),
2353 SD_JSON_BUILD_PAIR("refresh", SD_JSON_BUILD_UNSIGNED(rr->soa.refresh)),
2354 SD_JSON_BUILD_PAIR("expire", SD_JSON_BUILD_UNSIGNED(rr->soa.retry)),
2355 SD_JSON_BUILD_PAIR("minimum", SD_JSON_BUILD_UNSIGNED(rr->soa.minimum)));
2356
2357 case DNS_TYPE_MX:
2358 return sd_json_buildo(
2359 ret,
2360 SD_JSON_BUILD_PAIR("key", SD_JSON_BUILD_VARIANT(k)),
2361 SD_JSON_BUILD_PAIR("priority", SD_JSON_BUILD_UNSIGNED(rr->mx.priority)),
2362 SD_JSON_BUILD_PAIR("exchange", SD_JSON_BUILD_STRING(rr->mx.exchange)));
2363 case DNS_TYPE_LOC:
2364 return sd_json_buildo(
2365 ret,
2366 SD_JSON_BUILD_PAIR("key", SD_JSON_BUILD_VARIANT(k)),
2367 SD_JSON_BUILD_PAIR("version", SD_JSON_BUILD_UNSIGNED(rr->loc.version)),
2368 SD_JSON_BUILD_PAIR("size", SD_JSON_BUILD_UNSIGNED(rr->loc.size)),
2369 SD_JSON_BUILD_PAIR("horiz_pre", SD_JSON_BUILD_UNSIGNED(rr->loc.horiz_pre)),
2370 SD_JSON_BUILD_PAIR("vert_pre", SD_JSON_BUILD_UNSIGNED(rr->loc.vert_pre)),
2371 SD_JSON_BUILD_PAIR("latitude", SD_JSON_BUILD_UNSIGNED(rr->loc.latitude)),
2372 SD_JSON_BUILD_PAIR("longitude", SD_JSON_BUILD_UNSIGNED(rr->loc.longitude)),
2373 SD_JSON_BUILD_PAIR("altitude", SD_JSON_BUILD_UNSIGNED(rr->loc.altitude)));
2374
2375 case DNS_TYPE_DS:
2376 return sd_json_buildo(
2377 ret,
2378 SD_JSON_BUILD_PAIR("key", SD_JSON_BUILD_VARIANT(k)),
2379 SD_JSON_BUILD_PAIR("keyTag", SD_JSON_BUILD_UNSIGNED(rr->ds.key_tag)),
2380 SD_JSON_BUILD_PAIR("algorithm", SD_JSON_BUILD_UNSIGNED(rr->ds.algorithm)),
2381 SD_JSON_BUILD_PAIR("digestType", SD_JSON_BUILD_UNSIGNED(rr->ds.digest_type)),
2382 SD_JSON_BUILD_PAIR("digest", SD_JSON_BUILD_HEX(rr->ds.digest, rr->ds.digest_size)));
2383
2384 case DNS_TYPE_SSHFP:
2385 return sd_json_buildo(
2386 ret,
2387 SD_JSON_BUILD_PAIR("key", SD_JSON_BUILD_VARIANT(k)),
2388 SD_JSON_BUILD_PAIR("algorithm", SD_JSON_BUILD_UNSIGNED(rr->sshfp.algorithm)),
2389 SD_JSON_BUILD_PAIR("fptype", SD_JSON_BUILD_UNSIGNED(rr->sshfp.fptype)),
2390 SD_JSON_BUILD_PAIR("fingerprint", SD_JSON_BUILD_HEX(rr->sshfp.fingerprint, rr->sshfp.fingerprint_size)));
2391
2392 case DNS_TYPE_DNSKEY:
2393 return sd_json_buildo(
2394 ret,
2395 SD_JSON_BUILD_PAIR("key", SD_JSON_BUILD_VARIANT(k)),
2396 SD_JSON_BUILD_PAIR("flags", SD_JSON_BUILD_UNSIGNED(rr->dnskey.flags)),
2397 SD_JSON_BUILD_PAIR("protocol", SD_JSON_BUILD_UNSIGNED(rr->dnskey.protocol)),
2398 SD_JSON_BUILD_PAIR("algorithm", SD_JSON_BUILD_UNSIGNED(rr->dnskey.algorithm)),
2399 SD_JSON_BUILD_PAIR("dnskey", SD_JSON_BUILD_BASE64(rr->dnskey.key, rr->dnskey.key_size)));
2400
2401 case DNS_TYPE_RRSIG:
2402 return sd_json_buildo(
2403 ret,
2404 SD_JSON_BUILD_PAIR("key", SD_JSON_BUILD_VARIANT(k)),
2405 SD_JSON_BUILD_PAIR("signer", SD_JSON_BUILD_STRING(rr->rrsig.signer)),
2406 SD_JSON_BUILD_PAIR("typeCovered", SD_JSON_BUILD_UNSIGNED(rr->rrsig.type_covered)),
2407 SD_JSON_BUILD_PAIR("algorithm", SD_JSON_BUILD_UNSIGNED(rr->rrsig.algorithm)),
2408 SD_JSON_BUILD_PAIR("labels", SD_JSON_BUILD_UNSIGNED(rr->rrsig.labels)),
2409 SD_JSON_BUILD_PAIR("originalTtl", SD_JSON_BUILD_UNSIGNED(rr->rrsig.original_ttl)),
2410 SD_JSON_BUILD_PAIR("expiration", SD_JSON_BUILD_UNSIGNED(rr->rrsig.expiration)),
2411 SD_JSON_BUILD_PAIR("inception", SD_JSON_BUILD_UNSIGNED(rr->rrsig.inception)),
2412 SD_JSON_BUILD_PAIR("keyTag", SD_JSON_BUILD_UNSIGNED(rr->rrsig.key_tag)),
2413 SD_JSON_BUILD_PAIR("signature", SD_JSON_BUILD_BASE64(rr->rrsig.signature, rr->rrsig.signature_size)));
2414
2415 case DNS_TYPE_NSEC: {
2416 _cleanup_(sd_json_variant_unrefp) sd_json_variant *bm = NULL;
2417
2418 r = type_bitmap_to_json(rr->nsec.types, &bm);
2419 if (r < 0)
2420 return r;
2421
2422 return sd_json_buildo(
2423 ret,
2424 SD_JSON_BUILD_PAIR("key", SD_JSON_BUILD_VARIANT(k)),
2425 SD_JSON_BUILD_PAIR("nextDomain", SD_JSON_BUILD_STRING(rr->nsec.next_domain_name)),
2426 SD_JSON_BUILD_PAIR("types", SD_JSON_BUILD_VARIANT(bm)));
2427 }
2428
2429 case DNS_TYPE_NSEC3: {
2430 _cleanup_(sd_json_variant_unrefp) sd_json_variant *bm = NULL;
2431
2432 r = type_bitmap_to_json(rr->nsec3.types, &bm);
2433 if (r < 0)
2434 return r;
2435
2436 return sd_json_buildo(
2437 ret,
2438 SD_JSON_BUILD_PAIR("key", SD_JSON_BUILD_VARIANT(k)),
2439 SD_JSON_BUILD_PAIR("algorithm", SD_JSON_BUILD_UNSIGNED(rr->nsec3.algorithm)),
2440 SD_JSON_BUILD_PAIR("flags", SD_JSON_BUILD_UNSIGNED(rr->nsec3.flags)),
2441 SD_JSON_BUILD_PAIR("iterations", SD_JSON_BUILD_UNSIGNED(rr->nsec3.iterations)),
2442 SD_JSON_BUILD_PAIR("salt", SD_JSON_BUILD_HEX(rr->nsec3.salt, rr->nsec3.salt_size)),
2443 SD_JSON_BUILD_PAIR("hash", SD_JSON_BUILD_BASE32HEX(rr->nsec3.next_hashed_name, rr->nsec3.next_hashed_name_size)),
2444 SD_JSON_BUILD_PAIR("types", SD_JSON_BUILD_VARIANT(bm)));
2445 }
2446
2447 case DNS_TYPE_TLSA:
2448 return sd_json_buildo(
2449 ret,
2450 SD_JSON_BUILD_PAIR("key", SD_JSON_BUILD_VARIANT(k)),
2451 SD_JSON_BUILD_PAIR("certUsage", SD_JSON_BUILD_UNSIGNED(rr->tlsa.cert_usage)),
2452 SD_JSON_BUILD_PAIR("selector", SD_JSON_BUILD_UNSIGNED(rr->tlsa.selector)),
2453 SD_JSON_BUILD_PAIR("matchingType", SD_JSON_BUILD_UNSIGNED(rr->tlsa.matching_type)),
2454 SD_JSON_BUILD_PAIR("data", SD_JSON_BUILD_HEX(rr->tlsa.data, rr->tlsa.data_size)));
2455
2456 case DNS_TYPE_SVCB:
2457 case DNS_TYPE_HTTPS: {
2458 _cleanup_(sd_json_variant_unrefp) sd_json_variant *p = NULL;
2459 r = svc_params_to_json(rr->svcb.params, &p);
2460 if (r < 0)
2461 return r;
2462
2463 return sd_json_buildo(
2464 ret,
2465 SD_JSON_BUILD_PAIR("key", SD_JSON_BUILD_VARIANT(k)),
2466 SD_JSON_BUILD_PAIR("priority", SD_JSON_BUILD_UNSIGNED(rr->svcb.priority)),
2467 SD_JSON_BUILD_PAIR("target", SD_JSON_BUILD_STRING(rr->svcb.target_name)),
2468 SD_JSON_BUILD_PAIR("svcparams", SD_JSON_BUILD_VARIANT(p)));
2469 }
2470
2471 case DNS_TYPE_CAA:
2472 return sd_json_buildo(
2473 ret,
2474 SD_JSON_BUILD_PAIR("key", SD_JSON_BUILD_VARIANT(k)),
2475 SD_JSON_BUILD_PAIR("flags", SD_JSON_BUILD_UNSIGNED(rr->caa.flags)),
2476 SD_JSON_BUILD_PAIR("tag", SD_JSON_BUILD_STRING(rr->caa.tag)),
2477 SD_JSON_BUILD_PAIR("value", SD_JSON_BUILD_OCTESCAPE(rr->caa.value, rr->caa.value_size)));
2478
2479 case DNS_TYPE_NAPTR:
2480 return sd_json_buildo(
2481 ret,
2482 SD_JSON_BUILD_PAIR("key", SD_JSON_BUILD_VARIANT(k)),
2483 SD_JSON_BUILD_PAIR("order", SD_JSON_BUILD_UNSIGNED(rr->naptr.order)),
2484 SD_JSON_BUILD_PAIR("preference", SD_JSON_BUILD_UNSIGNED(rr->naptr.preference)),
2485 /* NB: we name this flags field here naptrFlags, because there's already another "flags" field (for example in CAA) which has a different type */
2486 SD_JSON_BUILD_PAIR("naptrFlags", SD_JSON_BUILD_STRING(rr->naptr.flags)),
2487 SD_JSON_BUILD_PAIR("services", SD_JSON_BUILD_STRING(rr->naptr.services)),
2488 SD_JSON_BUILD_PAIR("regexp", SD_JSON_BUILD_STRING(rr->naptr.regexp)),
2489 SD_JSON_BUILD_PAIR("replacement", SD_JSON_BUILD_STRING(rr->naptr.replacement)));
2490
2491 default:
2492 /* Can't provide broken-down format */
2493 *ret = NULL;
2494 return 0;
2495 }
2496}
2497
2498static const char* const dnssec_algorithm_table[_DNSSEC_ALGORITHM_MAX_DEFINED] = {
2499 /* Mnemonics as listed on https://www.iana.org/assignments/dns-sec-alg-numbers/dns-sec-alg-numbers.xhtml */
2500 [DNSSEC_ALGORITHM_RSAMD5] = "RSAMD5",
2501 [DNSSEC_ALGORITHM_DH] = "DH",
2502 [DNSSEC_ALGORITHM_DSA] = "DSA",
2503 [DNSSEC_ALGORITHM_ECC] = "ECC",
2504 [DNSSEC_ALGORITHM_RSASHA1] = "RSASHA1",
2505 [DNSSEC_ALGORITHM_DSA_NSEC3_SHA1] = "DSA-NSEC3-SHA1",
2506 [DNSSEC_ALGORITHM_RSASHA1_NSEC3_SHA1] = "RSASHA1-NSEC3-SHA1",
2507 [DNSSEC_ALGORITHM_RSASHA256] = "RSASHA256",
2508 [DNSSEC_ALGORITHM_RSASHA512] = "RSASHA512",
2509 [DNSSEC_ALGORITHM_ECC_GOST] = "ECC-GOST",
2510 [DNSSEC_ALGORITHM_ECDSAP256SHA256] = "ECDSAP256SHA256",
2511 [DNSSEC_ALGORITHM_ECDSAP384SHA384] = "ECDSAP384SHA384",
2512 [DNSSEC_ALGORITHM_ED25519] = "ED25519",
2513 [DNSSEC_ALGORITHM_ED448] = "ED448",
2514 [DNSSEC_ALGORITHM_INDIRECT] = "INDIRECT",
2515 [DNSSEC_ALGORITHM_PRIVATEDNS] = "PRIVATEDNS",
2516 [DNSSEC_ALGORITHM_PRIVATEOID] = "PRIVATEOID",
2517};
2518DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(dnssec_algorithm, int, 255);
2519
2520static const char* const dnssec_digest_table[_DNSSEC_DIGEST_MAX_DEFINED] = {
2521 /* Names as listed on https://www.iana.org/assignments/ds-rr-types/ds-rr-types.xhtml */
2522 [DNSSEC_DIGEST_SHA1] = "SHA-1",
2523 [DNSSEC_DIGEST_SHA256] = "SHA-256",
2524 [DNSSEC_DIGEST_GOST_R_34_11_94] = "GOST_R_34.11-94",
2525 [DNSSEC_DIGEST_SHA384] = "SHA-384",
2526};
2527DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(dnssec_digest, int, 255);
2528
2529static const char* const sshfp_algorithm_table[_SSHFP_ALGORITHM_MAX_DEFINED] = {
2530 [SSHFP_ALGORITHM_RSA] = "RSA", /* RFC 4255 */
2531 [SSHFP_ALGORITHM_DSA] = "DSA", /* RFC 4255 */
2532 [SSHFP_ALGORITHM_ECDSA] = "ECDSA", /* RFC 6594 */
2533 [SSHFP_ALGORITHM_ED25519] = "Ed25519", /* RFC 7479 */
2534 [SSHFP_ALGORITHM_ED448] = "Ed448", /* RFC 8709 */
2535};
2536DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(sshfp_algorithm, int, 255);
2537
2538static const char* const sshfp_key_type_table[_SSHFP_KEY_TYPE_MAX_DEFINED] = {
2539 [SSHFP_KEY_TYPE_SHA1] = "SHA-1", /* RFC 4255 */
2540 [SSHFP_KEY_TYPE_SHA256] = "SHA-256", /* RFC 4255 */
2541};
2542DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(sshfp_key_type, int, 255);
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