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various: make parse_env_file error handling the same in various places
[thirdparty/systemd.git] / src / resolve / resolved-dns-rr.c
CommitLineData
db9ecf05 1/* SPDX-License-Identifier: LGPL-2.1-or-later */
74b2466e 2
0dae31d4
ZJS		 3#include <math.h>
4
b5efdb8a 5#include "alloc-util.h"
4ad7f276 6#include "dns-domain.h"
7263f724 7#include "dns-type.h"
95052df3 8#include "escape.h"
e4e73a63 9#include "hexdecoct.h"
9bd2422a 10#include "memory-util.h"
fc8eec10 11#include "resolved-dns-dnssec.h"
07630cea 12#include "resolved-dns-packet.h"
e4e73a63 13#include "resolved-dns-rr.h"
8730bccf 14#include "string-table.h"
07630cea
LP		 15#include "string-util.h"
16#include "strv.h"
d7671a3e 17#include "terminal-util.h"
74b2466e 18
faa133f3
LP		 19DnsResourceKey* dns_resource_key_new(uint16_t class, uint16_t type, const char *name) {
20 DnsResourceKey *k;
21 size_t l;
74b2466e 22
faa133f3
LP		 23 assert(name);
24
25 l = strlen(name);
26 k = malloc0(sizeof(DnsResourceKey) + l + 1);
27 if (!k)
28 return NULL;
29
30 k->n_ref = 1;
31 k->class = class;
32 k->type = type;
33
34 strcpy((char*) k + sizeof(DnsResourceKey), name);
35
36 return k;
37}
38
36d9205d 39DnsResourceKey* dns_resource_key_new_redirect(const DnsResourceKey *key, const DnsResourceRecord *cname) {
58db254a
LP		 40 int r;
41
36d9205d
TG		 42 assert(key);
43 assert(cname);
44
58db254a
LP		 45 assert(IN_SET(cname->key->type, DNS_TYPE_CNAME, DNS_TYPE_DNAME));
46
47 if (cname->key->type == DNS_TYPE_CNAME)
48 return dns_resource_key_new(key->class, key->type, cname->cname.name);
49 else {
5afcf89c 50 _cleanup_free_ char *destination = NULL;
58db254a 51 DnsResourceKey *k;
58db254a 52
1c02e7ba 53 r = dns_name_change_suffix(dns_resource_key_name(key), dns_resource_key_name(cname->key), cname->dname.name, &destination);
58db254a
LP		 54 if (r < 0)
55 return NULL;
56 if (r == 0)
57 return dns_resource_key_ref((DnsResourceKey*) key);
58
59 k = dns_resource_key_new_consume(key->class, key->type, destination);
6b430fdb 60 if (!k)
5afcf89c 61 return NULL;
58db254a 62
5afcf89c 63 TAKE_PTR(destination);
58db254a
LP		 64 return k;
65 }
36d9205d
TG		 66}
67
801ad6a6
LP		 68int dns_resource_key_new_append_suffix(DnsResourceKey **ret, DnsResourceKey *key, char *name) {
69 DnsResourceKey *new_key;
70 char *joined;
71 int r;
72
73 assert(ret);
74 assert(key);
75 assert(name);
76
dc477e73 77 if (dns_name_is_root(name)) {
801ad6a6
LP		 78 *ret = dns_resource_key_ref(key);
79 return 0;
80 }
81
7470cc4c 82 r = dns_name_concat(dns_resource_key_name(key), name, 0, &joined);
801ad6a6
LP		 83 if (r < 0)
84 return r;
85
86 new_key = dns_resource_key_new_consume(key->class, key->type, joined);
87 if (!new_key) {
88 free(joined);
89 return -ENOMEM;
90 }
91
92 *ret = new_key;
93 return 0;
94}
95
faa133f3
LP		 96DnsResourceKey* dns_resource_key_new_consume(uint16_t class, uint16_t type, char *name) {
97 DnsResourceKey *k;
98
99 assert(name);
100
1ed31408 101 k = new(DnsResourceKey, 1);
faa133f3
LP		 102 if (!k)
103 return NULL;
104
1ed31408
LP		 105 *k = (DnsResourceKey) {
106 .n_ref = 1,
107 .class = class,
108 .type = type,
109 ._name = name,
110 };
faa133f3
LP		 111
112 return k;
113}
114
115DnsResourceKey* dns_resource_key_ref(DnsResourceKey *k) {
116
117 if (!k)
118 return NULL;
119
1b4f6e79
LP		 120 /* Static/const keys created with DNS_RESOURCE_KEY_CONST will
121 * set this to -1, they should not be reffed/unreffed */
f5fbe71d 122 assert(k->n_ref != UINT_MAX);
1b4f6e79 123
faa133f3
LP		 124 assert(k->n_ref > 0);
125 k->n_ref++;
126
127 return k;
128}
129
130DnsResourceKey* dns_resource_key_unref(DnsResourceKey *k) {
131 if (!k)
132 return NULL;
133
f5fbe71d 134 assert(k->n_ref != UINT_MAX);
faa133f3
LP		 135 assert(k->n_ref > 0);
136
137 if (k->n_ref == 1) {
138 free(k->_name);
139 free(k);
140 } else
141 k->n_ref--;
142
143 return NULL;
144}
145
1c02e7ba
ZJS		 146const char* dns_resource_key_name(const DnsResourceKey *key) {
147 const char *name;
148
149 if (!key)
150 return NULL;
151
152 if (key->_name)
153 name = key->_name;
154 else
155 name = (char*) key + sizeof(DnsResourceKey);
156
157 if (dns_name_is_root(name))
158 return ".";
159 else
160 return name;
161}
162
28b9b764
LP		 163bool dns_resource_key_is_address(const DnsResourceKey *key) {
164 assert(key);
165
166 /* Check if this is an A or AAAA resource key */
167
168 return key->class == DNS_CLASS_IN && IN_SET(key->type, DNS_TYPE_A, DNS_TYPE_AAAA);
169}
170
a2bf8a19
DR		 171bool dns_resource_key_is_dnssd_ptr(const DnsResourceKey *key) {
172 assert(key);
173
174 /* Check if this is a PTR resource key used in
175 Service Instance Enumeration as described in RFC6763 p4.1. */
176
177 if (key->type != DNS_TYPE_PTR)
178 return false;
179
180 return dns_name_endswith(dns_resource_key_name(key), "_tcp.local") ||
181 dns_name_endswith(dns_resource_key_name(key), "_udp.local");
182}
183
faa133f3
LP		 184int dns_resource_key_equal(const DnsResourceKey *a, const DnsResourceKey *b) {
185 int r;
186
4d247a6c
LP		 187 if (a == b)
188 return 1;
189
1c02e7ba 190 r = dns_name_equal(dns_resource_key_name(a), dns_resource_key_name(b));
faa133f3
LP		 191 if (r <= 0)
192 return r;
193
194 if (a->class != b->class)
195 return 0;
196
197 if (a->type != b->type)
198 return 0;
199
200 return 1;
201}
202
105e1512 203int dns_resource_key_match_rr(const DnsResourceKey *key, DnsResourceRecord *rr, const char *search_domain) {
801ad6a6
LP		 204 int r;
205
faa133f3
LP		 206 assert(key);
207 assert(rr);
208
4d247a6c
LP		 209 if (key == rr->key)
210 return 1;
211
801ad6a6
LP		 212 /* Checks if an rr matches the specified key. If a search
213 * domain is specified, it will also be checked if the key
214 * with the search domain suffixed might match the RR. */
215
faa133f3
LP		 216 if (rr->key->class != key->class && key->class != DNS_CLASS_ANY)
217 return 0;
218
219 if (rr->key->type != key->type && key->type != DNS_TYPE_ANY)
220 return 0;
221
1c02e7ba 222 r = dns_name_equal(dns_resource_key_name(rr->key), dns_resource_key_name(key));
801ad6a6
LP		 223 if (r != 0)
224 return r;
225
226 if (search_domain) {
227 _cleanup_free_ char *joined = NULL;
228
7470cc4c 229 r = dns_name_concat(dns_resource_key_name(key), search_domain, 0, &joined);
801ad6a6
LP		 230 if (r < 0)
231 return r;
232
1c02e7ba 233 return dns_name_equal(dns_resource_key_name(rr->key), joined);
801ad6a6
LP		 234 }
235
236 return 0;
faa133f3
LP		 237}
238
5d27351f 239int dns_resource_key_match_cname_or_dname(const DnsResourceKey *key, const DnsResourceKey *cname, const char *search_domain) {
801ad6a6
LP		 240 int r;
241
faa133f3 242 assert(key);
5d27351f 243 assert(cname);
faa133f3 244
5d27351f 245 if (cname->class != key->class && key->class != DNS_CLASS_ANY)
faa133f3
LP		 246 return 0;
247
d2995826
LP		 248 if (!dns_type_may_redirect(key->type))
249 return 0;
250
5d27351f 251 if (cname->type == DNS_TYPE_CNAME)
1c02e7ba 252 r = dns_name_equal(dns_resource_key_name(key), dns_resource_key_name(cname));
5d27351f 253 else if (cname->type == DNS_TYPE_DNAME)
1c02e7ba 254 r = dns_name_endswith(dns_resource_key_name(key), dns_resource_key_name(cname));
58db254a 255 else
faa133f3 256 return 0;
801ad6a6
LP		 257
258 if (r != 0)
259 return r;
260
261 if (search_domain) {
262 _cleanup_free_ char *joined = NULL;
263
7470cc4c 264 r = dns_name_concat(dns_resource_key_name(key), search_domain, 0, &joined);
801ad6a6
LP		 265 if (r < 0)
266 return r;
267
5d27351f 268 if (cname->type == DNS_TYPE_CNAME)
1c02e7ba 269 return dns_name_equal(joined, dns_resource_key_name(cname));
5d27351f 270 else if (cname->type == DNS_TYPE_DNAME)
1c02e7ba 271 return dns_name_endswith(joined, dns_resource_key_name(cname));
801ad6a6
LP		 272 }
273
274 return 0;
547973de
LP		 275}
276
277int dns_resource_key_match_soa(const DnsResourceKey *key, const DnsResourceKey *soa) {
278 assert(soa);
279 assert(key);
280
281 /* Checks whether 'soa' is a SOA record for the specified key. */
282
65b200e7 283 if (soa->class != key->class)
547973de 284 return 0;
801ad6a6 285
547973de
LP		 286 if (soa->type != DNS_TYPE_SOA)
287 return 0;
288
1c02e7ba 289 return dns_name_endswith(dns_resource_key_name(key), dns_resource_key_name(soa));
74b2466e
LP		 290}
291
7a08d314 292static void dns_resource_key_hash_func(const DnsResourceKey *k, struct siphash *state) {
b826ab58 293 assert(k);
322345fd 294
1c02e7ba 295 dns_name_hash_func(dns_resource_key_name(k), state);
b826ab58
TG		 296 siphash24_compress(&k->class, sizeof(k->class), state);
297 siphash24_compress(&k->type, sizeof(k->type), state);
322345fd
LP		 298}
299
7a08d314 300static int dns_resource_key_compare_func(const DnsResourceKey *x, const DnsResourceKey *y) {
60086492 301 int r;
322345fd 302
60086492
YW		 303 r = dns_name_compare_func(dns_resource_key_name(x), dns_resource_key_name(y));
304 if (r != 0)
305 return r;
322345fd 306
60086492
YW		 307 r = CMP(x->type, y->type);
308 if (r != 0)
309 return r;
322345fd 310
60086492 311 return CMP(x->class, y->class);
322345fd
LP		 312}
313
7a08d314 314DEFINE_HASH_OPS(dns_resource_key_hash_ops, DnsResourceKey, dns_resource_key_hash_func, dns_resource_key_compare_func);
d5099efc 315
202b76ae 316char* dns_resource_key_to_string(const DnsResourceKey *key, char *buf, size_t buf_size) {
1c02e7ba 317 const char *c, *t;
202b76ae 318 char *ans = buf;
2d4c5cbc 319
6af47493
LP		 320 /* If we cannot convert the CLASS/TYPE into a known string,
321 use the format recommended by RFC 3597, Section 5. */
322
2d4c5cbc 323 c = dns_class_to_string(key->class);
2d4c5cbc 324 t = dns_type_to_string(key->type);
2d4c5cbc 325
121ed16c
LB		 326 (void) snprintf(buf, buf_size, "%s %s%s%.0u %s%s%.0u",
327 dns_resource_key_name(key),
328 strempty(c), c ? "" : "CLASS", c ? 0 : key->class,
329 strempty(t), t ? "" : "TYPE", t ? 0 : key->type);
2d4c5cbc 330
202b76ae 331 return ans;
2d4c5cbc
LP		 332}
333
f57e3cd5
LP		 334bool dns_resource_key_reduce(DnsResourceKey **a, DnsResourceKey **b) {
335 assert(a);
336 assert(b);
337
338 /* Try to replace one RR key by another if they are identical, thus saving a bit of memory. Note that we do
339 * this only for RR keys, not for RRs themselves, as they carry a lot of additional metadata (where they come
340 * from, validity data, and suchlike), and cannot be replaced so easily by other RRs that have the same
341 * superficial data. */
342
343 if (!*a)
344 return false;
345 if (!*b)
346 return false;
347
348 /* We refuse merging const keys */
f5fbe71d 349 if ((*a)->n_ref == UINT_MAX)
f57e3cd5 350 return false;
f5fbe71d 351 if ((*b)->n_ref == UINT_MAX)
f57e3cd5
LP		 352 return false;
353
354 /* Already the same? */
355 if (*a == *b)
356 return true;
357
358 /* Are they really identical? */
359 if (dns_resource_key_equal(*a, *b) <= 0)
360 return false;
361
362 /* Keep the one which already has more references. */
363 if ((*a)->n_ref > (*b)->n_ref) {
364 dns_resource_key_unref(*b);
365 *b = dns_resource_key_ref(*a);
366 } else {
367 dns_resource_key_unref(*a);
368 *a = dns_resource_key_ref(*b);
369 }
370
371 return true;
372}
373
faa133f3 374DnsResourceRecord* dns_resource_record_new(DnsResourceKey *key) {
74b2466e
LP		 375 DnsResourceRecord *rr;
376
1ed31408 377 rr = new(DnsResourceRecord, 1);
74b2466e
LP		 378 if (!rr)
379 return NULL;
380
1ed31408
LP		 381 *rr = (DnsResourceRecord) {
382 .n_ref = 1,
383 .key = dns_resource_key_ref(key),
384 .expiry = USEC_INFINITY,
98e80bf9
ZJS		 385 .n_skip_labels_signer = UINT8_MAX,
386 .n_skip_labels_source = UINT8_MAX,
1ed31408 387 };
faa133f3 388
74b2466e
LP		 389 return rr;
390}
391
8bf52d3d
LP		 392DnsResourceRecord* 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
8301aa0b
YW		 402static DnsResourceRecord* dns_resource_record_free(DnsResourceRecord *rr) {
403 assert(rr);
74b2466e 404
faa133f3 405 if (rr->key) {
9de3e329 406 switch(rr->key->type) {
9c92ce6d
LP		 407
408 case DNS_TYPE_SRV:
409 free(rr->srv.name);
410 break;
411
9de3e329
ZJS		 412 case DNS_TYPE_PTR:
413 case DNS_TYPE_NS:
414 case DNS_TYPE_CNAME:
8ac4e9e1 415 case DNS_TYPE_DNAME:
faa133f3 416 free(rr->ptr.name);
9de3e329 417 break;
9c92ce6d 418
9de3e329 419 case DNS_TYPE_HINFO:
faa133f3
LP		 420 free(rr->hinfo.cpu);
421 free(rr->hinfo.os);
9de3e329 422 break;
9c92ce6d 423
9de3e329 424 case DNS_TYPE_TXT:
9c92ce6d 425 case DNS_TYPE_SPF:
2001c805 426 dns_txt_item_free_all(rr->txt.items);
9de3e329 427 break;
9c92ce6d 428
9de3e329 429 case DNS_TYPE_SOA:
7e8e0422
LP		 430 free(rr->soa.mname);
431 free(rr->soa.rname);
9de3e329 432 break;
9c92ce6d 433
9de3e329 434 case DNS_TYPE_MX:
946c7094 435 free(rr->mx.exchange);
9de3e329 436 break;
9c92ce6d 437
abf126a3
TG		 438 case DNS_TYPE_DS:
439 free(rr->ds.digest);
440 break;
441
42cc2eeb 442 case DNS_TYPE_SSHFP:
549c1a25 443 free(rr->sshfp.fingerprint);
42cc2eeb
LP		 444 break;
445
8db0d2f5
ZJS		 446 case DNS_TYPE_DNSKEY:
447 free(rr->dnskey.key);
448 break;
449
151226ab
ZJS		 450 case DNS_TYPE_RRSIG:
451 free(rr->rrsig.signer);
452 free(rr->rrsig.signature);
453 break;
454
50f1e641
TG		 455 case DNS_TYPE_NSEC:
456 free(rr->nsec.next_domain_name);
457 bitmap_free(rr->nsec.types);
458 break;
459
5d45a880
TG		 460 case DNS_TYPE_NSEC3:
461 free(rr->nsec3.next_hashed_name);
462 free(rr->nsec3.salt);
463 bitmap_free(rr->nsec3.types);
464 break;
465
0dae31d4 466 case DNS_TYPE_LOC:
9de3e329
ZJS		 467 case DNS_TYPE_A:
468 case DNS_TYPE_AAAA:
469 break;
9c92ce6d 470
48d45d2b
ZJS		 471 case DNS_TYPE_TLSA:
472 free(rr->tlsa.data);
473 break;
474
95052df3
ZJS		 475 case DNS_TYPE_CAA:
476 free(rr->caa.tag);
477 free(rr->caa.value);
478 break;
479
d93a16b8 480 case DNS_TYPE_OPENPGPKEY:
9de3e329 481 default:
52e085af 482 if (!rr->unparsable)
bfc1d734 483 free(rr->generic.data);
9de3e329 484 }
322345fd 485
52e085af 486 if (rr->unparsable)
bfc1d734
ZJS		 487 free(rr->generic.data);
488
a8812dd7 489 free(rr->wire_format);
faa133f3
LP		 490 dns_resource_key_unref(rr->key);
491 }
322345fd 492
7b50eb2e 493 free(rr->to_string);
6b430fdb 494 return mfree(rr);
322345fd
LP		 495}
496
8301aa0b
YW		 497DEFINE_TRIVIAL_REF_UNREF_FUNC(DnsResourceRecord, dns_resource_record, dns_resource_record_free);
498
623a4c97
LP		 499int dns_resource_record_new_reverse(DnsResourceRecord **ret, int family, const union in_addr_union *address, const char *hostname) {
500 _cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL;
501 _cleanup_(dns_resource_record_unrefp) DnsResourceRecord *rr = NULL;
502 _cleanup_free_ char *ptr = NULL;
503 int r;
504
505 assert(ret);
506 assert(address);
507 assert(hostname);
508
509 r = dns_name_reverse(family, address, &ptr);
510 if (r < 0)
511 return r;
512
513 key = dns_resource_key_new_consume(DNS_CLASS_IN, DNS_TYPE_PTR, ptr);
514 if (!key)
515 return -ENOMEM;
516
517 ptr = NULL;
518
519 rr = dns_resource_record_new(key);
520 if (!rr)
521 return -ENOMEM;
522
523 rr->ptr.name = strdup(hostname);
524 if (!rr->ptr.name)
525 return -ENOMEM;
526
1cc6c93a 527 *ret = TAKE_PTR(rr);
623a4c97
LP		 528
529 return 0;
530}
531
78c6a153
LP		 532int dns_resource_record_new_address(DnsResourceRecord **ret, int family, const union in_addr_union *address, const char *name) {
533 DnsResourceRecord *rr;
534
535 assert(ret);
536 assert(address);
537 assert(family);
538
539 if (family == AF_INET) {
540
541 rr = dns_resource_record_new_full(DNS_CLASS_IN, DNS_TYPE_A, name);
542 if (!rr)
543 return -ENOMEM;
544
545 rr->a.in_addr = address->in;
546
547 } else if (family == AF_INET6) {
548
549 rr = dns_resource_record_new_full(DNS_CLASS_IN, DNS_TYPE_AAAA, name);
550 if (!rr)
551 return -ENOMEM;
552
553 rr->aaaa.in6_addr = address->in6;
554 } else
555 return -EAFNOSUPPORT;
556
557 *ret = rr;
558
559 return 0;
560}
561
a43a068a
ZJS		 562#define FIELD_EQUAL(a, b, field) \
563 ((a).field ## _size == (b).field ## _size && \
9bd2422a 564 memcmp_safe((a).field, (b).field, (a).field ## _size) == 0)
a43a068a 565
51969a58 566int dns_resource_record_payload_equal(const DnsResourceRecord *a, const DnsResourceRecord *b) {
322345fd
LP		 567 int r;
568
51969a58 569 /* Check if a and b are the same, but don't look at their keys */
322345fd 570
52e085af 571 if (a->unparsable != b->unparsable)
fd0b4602
LP		 572 return 0;
573
52e085af 574 switch (a->unparsable ? _DNS_TYPE_INVALID : a->key->type) {
2d4c5cbc 575
9c92ce6d
LP		 576 case DNS_TYPE_SRV:
577 r = dns_name_equal(a->srv.name, b->srv.name);
578 if (r <= 0)
579 return r;
580
581 return a->srv.priority == b->srv.priority &&
582 a->srv.weight == b->srv.weight &&
583 a->srv.port == b->srv.port;
584
2d4c5cbc
LP		 585 case DNS_TYPE_PTR:
586 case DNS_TYPE_NS:
587 case DNS_TYPE_CNAME:
8ac4e9e1 588 case DNS_TYPE_DNAME:
322345fd 589 return dns_name_equal(a->ptr.name, b->ptr.name);
2d4c5cbc
LP		 590
591 case DNS_TYPE_HINFO:
592 return strcaseeq(a->hinfo.cpu, b->hinfo.cpu) &&
593 strcaseeq(a->hinfo.os, b->hinfo.os);
594
9de3e329 595 case DNS_TYPE_SPF: /* exactly the same as TXT */
0f84a72e 596 case DNS_TYPE_TXT:
2001c805 597 return dns_txt_item_equal(a->txt.items, b->txt.items);
2e276efc 598
2d4c5cbc 599 case DNS_TYPE_A:
322345fd 600 return memcmp(&a->a.in_addr, &b->a.in_addr, sizeof(struct in_addr)) == 0;
2d4c5cbc
LP		 601
602 case DNS_TYPE_AAAA:
322345fd 603 return memcmp(&a->aaaa.in6_addr, &b->aaaa.in6_addr, sizeof(struct in6_addr)) == 0;
2d4c5cbc
LP		 604
605 case DNS_TYPE_SOA:
7e8e0422
LP		 606 r = dns_name_equal(a->soa.mname, b->soa.mname);
607 if (r <= 0)
608 return r;
609 r = dns_name_equal(a->soa.rname, b->soa.rname);
610 if (r <= 0)
611 return r;
612
613 return a->soa.serial == b->soa.serial &&
614 a->soa.refresh == b->soa.refresh &&
615 a->soa.retry == b->soa.retry &&
616 a->soa.expire == b->soa.expire &&
617 a->soa.minimum == b->soa.minimum;
9c92ce6d 618
946c7094
ZJS		 619 case DNS_TYPE_MX:
620 if (a->mx.priority != b->mx.priority)
621 return 0;
622
623 return dns_name_equal(a->mx.exchange, b->mx.exchange);
624
0dae31d4
ZJS		 625 case DNS_TYPE_LOC:
626 assert(a->loc.version == b->loc.version);
627
628 return a->loc.size == b->loc.size &&
629 a->loc.horiz_pre == b->loc.horiz_pre &&
630 a->loc.vert_pre == b->loc.vert_pre &&
631 a->loc.latitude == b->loc.latitude &&
632 a->loc.longitude == b->loc.longitude &&
633 a->loc.altitude == b->loc.altitude;
634
abf126a3
TG		 635 case DNS_TYPE_DS:
636 return a->ds.key_tag == b->ds.key_tag &&
637 a->ds.algorithm == b->ds.algorithm &&
638 a->ds.digest_type == b->ds.digest_type &&
a43a068a 639 FIELD_EQUAL(a->ds, b->ds, digest);
abf126a3 640
42cc2eeb
LP		 641 case DNS_TYPE_SSHFP:
642 return a->sshfp.algorithm == b->sshfp.algorithm &&
643 a->sshfp.fptype == b->sshfp.fptype &&
a43a068a 644 FIELD_EQUAL(a->sshfp, b->sshfp, fingerprint);
42cc2eeb 645
8db0d2f5 646 case DNS_TYPE_DNSKEY:
f91dc240
LP		 647 return a->dnskey.flags == b->dnskey.flags &&
648 a->dnskey.protocol == b->dnskey.protocol &&
8db0d2f5 649 a->dnskey.algorithm == b->dnskey.algorithm &&
a43a068a 650 FIELD_EQUAL(a->dnskey, b->dnskey, key);
8db0d2f5 651
151226ab
ZJS		 652 case DNS_TYPE_RRSIG:
653 /* do the fast comparisons first */
a43a068a
ZJS		 654 return a->rrsig.type_covered == b->rrsig.type_covered &&
655 a->rrsig.algorithm == b->rrsig.algorithm &&
656 a->rrsig.labels == b->rrsig.labels &&
657 a->rrsig.original_ttl == b->rrsig.original_ttl &&
658 a->rrsig.expiration == b->rrsig.expiration &&
659 a->rrsig.inception == b->rrsig.inception &&
660 a->rrsig.key_tag == b->rrsig.key_tag &&
661 FIELD_EQUAL(a->rrsig, b->rrsig, signature) &&
662 dns_name_equal(a->rrsig.signer, b->rrsig.signer);
151226ab 663
50f1e641
TG		 664 case DNS_TYPE_NSEC:
665 return dns_name_equal(a->nsec.next_domain_name, b->nsec.next_domain_name) &&
666 bitmap_equal(a->nsec.types, b->nsec.types);
667
5d45a880
TG		 668 case DNS_TYPE_NSEC3:
669 return a->nsec3.algorithm == b->nsec3.algorithm &&
a43a068a
ZJS		 670 a->nsec3.flags == b->nsec3.flags &&
671 a->nsec3.iterations == b->nsec3.iterations &&
672 FIELD_EQUAL(a->nsec3, b->nsec3, salt) &&
673 FIELD_EQUAL(a->nsec3, b->nsec3, next_hashed_name) &&
674 bitmap_equal(a->nsec3.types, b->nsec3.types);
5d45a880 675
48d45d2b
ZJS		 676 case DNS_TYPE_TLSA:
677 return a->tlsa.cert_usage == b->tlsa.cert_usage &&
678 a->tlsa.selector == b->tlsa.selector &&
679 a->tlsa.matching_type == b->tlsa.matching_type &&
a43a068a 680 FIELD_EQUAL(a->tlsa, b->tlsa, data);
48d45d2b 681
95052df3
ZJS		 682 case DNS_TYPE_CAA:
683 return a->caa.flags == b->caa.flags &&
684 streq(a->caa.tag, b->caa.tag) &&
685 FIELD_EQUAL(a->caa, b->caa, value);
686
687 case DNS_TYPE_OPENPGPKEY:
2d4c5cbc 688 default:
a43a068a 689 return FIELD_EQUAL(a->generic, b->generic, data);
2d4c5cbc 690 }
322345fd
LP		 691}
692
51969a58
ZJS		 693int dns_resource_record_equal(const DnsResourceRecord *a, const DnsResourceRecord *b) {
694 int r;
695
696 assert(a);
697 assert(b);
698
699 if (a == b)
700 return 1;
701
702 r = dns_resource_key_equal(a->key, b->key);
703 if (r <= 0)
704 return r;
705
706 return dns_resource_record_payload_equal(a, b);
707}
708
0dae31d4
ZJS		 709static char* format_location(uint32_t latitude, uint32_t longitude, uint32_t altitude,
710 uint8_t size, uint8_t horiz_pre, uint8_t vert_pre) {
711 char *s;
712 char NS = latitude >= 1U<<31 ? 'N' : 'S';
713 char EW = longitude >= 1U<<31 ? 'E' : 'W';
714
715 int lat = latitude >= 1U<<31 ? (int) (latitude - (1U<<31)) : (int) ((1U<<31) - latitude);
716 int lon = longitude >= 1U<<31 ? (int) (longitude - (1U<<31)) : (int) ((1U<<31) - longitude);
717 double alt = altitude >= 10000000u ? altitude - 10000000u : -(double)(10000000u - altitude);
718 double siz = (size >> 4) * exp10((double) (size & 0xF));
719 double hor = (horiz_pre >> 4) * exp10((double) (horiz_pre & 0xF));
720 double ver = (vert_pre >> 4) * exp10((double) (vert_pre & 0xF));
721
722 if (asprintf(&s, "%d %d %.3f %c %d %d %.3f %c %.2fm %.2fm %.2fm %.2fm",
723 (lat / 60000 / 60),
724 (lat / 60000) % 60,
725 (lat % 60000) / 1000.,
726 NS,
727 (lon / 60000 / 60),
728 (lon / 60000) % 60,
729 (lon % 60000) / 1000.,
730 EW,
731 alt / 100.,
732 siz / 100.,
733 hor / 100.,
734 ver / 100.) < 0)
735 return NULL;
736
737 return s;
738}
739
7c6423e1
TG		 740static int format_timestamp_dns(char *buf, size_t l, time_t sec) {
741 struct tm tm;
742
743 assert(buf);
fbd0b64f 744 assert(l > STRLEN("YYYYMMDDHHmmSS"));
7c6423e1
TG		 745
746 if (!gmtime_r(&sec, &tm))
747 return -EINVAL;
748
749 if (strftime(buf, l, "%Y%m%d%H%M%S", &tm) <= 0)
750 return -EINVAL;
751
752 return 0;
753}
754
50f1e641
TG		 755static char *format_types(Bitmap *types) {
756 _cleanup_strv_free_ char **strv = NULL;
757 _cleanup_free_ char *str = NULL;
758 unsigned type;
759 int r;
760
90e74a66 761 BITMAP_FOREACH(type, types) {
50f1e641 762 if (dns_type_to_string(type)) {
2c1fb4f7 763 r = strv_extend(&strv, dns_type_to_string(type));
50f1e641
TG		 764 if (r < 0)
765 return NULL;
766 } else {
767 char *t;
768
769 r = asprintf(&t, "TYPE%u", type);
770 if (r < 0)
771 return NULL;
772
2c1fb4f7 773 r = strv_consume(&strv, t);
50f1e641
TG		 774 if (r < 0)
775 return NULL;
776 }
777 }
778
779 str = strv_join(strv, " ");
780 if (!str)
781 return NULL;
782
605405c6 783 return strjoin("( ", str, " )");
50f1e641
TG		 784}
785
2001c805
LP		 786static char *format_txt(DnsTxtItem *first) {
787 DnsTxtItem *i;
788 size_t c = 1;
789 char *p, *s;
790
791 LIST_FOREACH(items, i, first)
792 c += i->length * 4 + 3;
793
794 p = s = new(char, c);
795 if (!s)
796 return NULL;
797
798 LIST_FOREACH(items, i, first) {
2001c805
LP		 799 if (i != first)
800 *(p++) = ' ';
801
802 *(p++) = '"';
803
6f1d18ae 804 for (size_t j = 0; j < i->length; j++) {
2001c805
LP		 805 if (i->data[j] < ' ' || i->data[j] == '"' || i->data[j] >= 127) {
806 *(p++) = '\\';
807 *(p++) = '0' + (i->data[j] / 100);
808 *(p++) = '0' + ((i->data[j] / 10) % 10);
809 *(p++) = '0' + (i->data[j] % 10);
810 } else
811 *(p++) = i->data[j];
812 }
813
814 *(p++) = '"';
815 }
816
817 *p = 0;
818 return s;
819}
820
7b50eb2e 821const char *dns_resource_record_to_string(DnsResourceRecord *rr) {
bc833401
DT		 822 _cleanup_free_ char *s = NULL, *t = NULL;
823 char k[DNS_RESOURCE_KEY_STRING_MAX];
2d4c5cbc 824 int r;
322345fd 825
2d4c5cbc 826 assert(rr);
322345fd 827
7b50eb2e
LP		 828 if (rr->to_string)
829 return rr->to_string;
830
202b76ae 831 dns_resource_key_to_string(rr->key, k, sizeof(k));
322345fd 832
52e085af 833 switch (rr->unparsable ? _DNS_TYPE_INVALID : rr->key->type) {
322345fd 834
9c92ce6d
LP		 835 case DNS_TYPE_SRV:
836 r = asprintf(&s, "%s %u %u %u %s",
837 k,
838 rr->srv.priority,
839 rr->srv.weight,
840 rr->srv.port,
841 strna(rr->srv.name));
842 if (r < 0)
7b50eb2e 843 return NULL;
9c92ce6d
LP		 844 break;
845
2d4c5cbc
LP		 846 case DNS_TYPE_PTR:
847 case DNS_TYPE_NS:
848 case DNS_TYPE_CNAME:
8ac4e9e1 849 case DNS_TYPE_DNAME:
605405c6 850 s = strjoin(k, " ", rr->ptr.name);
2d4c5cbc 851 if (!s)
7b50eb2e 852 return NULL;
322345fd 853
2d4c5cbc 854 break;
322345fd 855
2d4c5cbc 856 case DNS_TYPE_HINFO:
605405c6 857 s = strjoin(k, " ", rr->hinfo.cpu, " ", rr->hinfo.os);
2d4c5cbc 858 if (!s)
7b50eb2e 859 return NULL;
2d4c5cbc 860 break;
322345fd 861
9de3e329 862 case DNS_TYPE_SPF: /* exactly the same as TXT */
8db0d2f5 863 case DNS_TYPE_TXT:
2001c805 864 t = format_txt(rr->txt.items);
2e276efc 865 if (!t)
7b50eb2e 866 return NULL;
2e276efc 867
605405c6 868 s = strjoin(k, " ", t);
2e276efc 869 if (!s)
7b50eb2e 870 return NULL;
2e276efc 871 break;
2e276efc 872
037e5b15
DT		 873 case DNS_TYPE_A:
874 r = in_addr_to_string(AF_INET, (const union in_addr_union*) &rr->a.in_addr, &t);
2d4c5cbc 875 if (r < 0)
7b50eb2e 876 return NULL;
322345fd 877
037e5b15 878 s = strjoin(k, " ", t);
2d4c5cbc 879 if (!s)
7b50eb2e 880 return NULL;
2d4c5cbc 881 break;
322345fd 882
8db0d2f5
ZJS		 883 case DNS_TYPE_AAAA:
884 r = in_addr_to_string(AF_INET6, (const union in_addr_union*) &rr->aaaa.in6_addr, &t);
2d4c5cbc 885 if (r < 0)
7b50eb2e 886 return NULL;
322345fd 887
605405c6 888 s = strjoin(k, " ", t);
2d4c5cbc 889 if (!s)
7b50eb2e 890 return NULL;
2d4c5cbc 891 break;
322345fd 892
2d4c5cbc
LP		 893 case DNS_TYPE_SOA:
894 r = asprintf(&s, "%s %s %s %u %u %u %u %u",
895 k,
896 strna(rr->soa.mname),
897 strna(rr->soa.rname),
898 rr->soa.serial,
899 rr->soa.refresh,
900 rr->soa.retry,
901 rr->soa.expire,
902 rr->soa.minimum);
903 if (r < 0)
7b50eb2e 904 return NULL;
2d4c5cbc
LP		 905 break;
906
946c7094
ZJS		 907 case DNS_TYPE_MX:
908 r = asprintf(&s, "%s %u %s",
909 k,
910 rr->mx.priority,
911 rr->mx.exchange);
912 if (r < 0)
7b50eb2e 913 return NULL;
946c7094
ZJS		 914 break;
915
8db0d2f5 916 case DNS_TYPE_LOC:
0dae31d4
ZJS		 917 assert(rr->loc.version == 0);
918
8db0d2f5
ZJS		 919 t = format_location(rr->loc.latitude,
920 rr->loc.longitude,
921 rr->loc.altitude,
922 rr->loc.size,
923 rr->loc.horiz_pre,
924 rr->loc.vert_pre);
925 if (!t)
7b50eb2e 926 return NULL;
0dae31d4 927
605405c6 928 s = strjoin(k, " ", t);
0dae31d4 929 if (!s)
7b50eb2e 930 return NULL;
0dae31d4 931 break;
0dae31d4 932
abf126a3
TG		 933 case DNS_TYPE_DS:
934 t = hexmem(rr->ds.digest, rr->ds.digest_size);
935 if (!t)
7b50eb2e 936 return NULL;
abf126a3
TG		 937
938 r = asprintf(&s, "%s %u %u %u %s",
939 k,
940 rr->ds.key_tag,
941 rr->ds.algorithm,
942 rr->ds.digest_type,
943 t);
944 if (r < 0)
7b50eb2e 945 return NULL;
abf126a3
TG		 946 break;
947
8db0d2f5 948 case DNS_TYPE_SSHFP:
549c1a25 949 t = hexmem(rr->sshfp.fingerprint, rr->sshfp.fingerprint_size);
8db0d2f5 950 if (!t)
7b50eb2e 951 return NULL;
42cc2eeb
LP		 952
953 r = asprintf(&s, "%s %u %u %s",
954 k,
955 rr->sshfp.algorithm,
956 rr->sshfp.fptype,
8db0d2f5 957 t);
42cc2eeb 958 if (r < 0)
7b50eb2e 959 return NULL;
42cc2eeb 960 break;
42cc2eeb 961
ff3d6560 962 case DNS_TYPE_DNSKEY: {
8e54f5d9 963 _cleanup_free_ char *alg = NULL;
fc8eec10
ZJS		 964 uint16_t key_tag;
965
966 key_tag = dnssec_keytag(rr, true);
ff3d6560 967
8e54f5d9
LP		 968 r = dnssec_algorithm_to_string_alloc(rr->dnskey.algorithm, &alg);
969 if (r < 0)
970 return NULL;
ff3d6560 971
516a00e9 972 r = asprintf(&t, "%s %u %u %s",
8db0d2f5 973 k,
f91dc240
LP		 974 rr->dnskey.flags,
975 rr->dnskey.protocol,
4bb91a95 976 alg);
8db0d2f5 977 if (r < 0)
7b50eb2e 978 return NULL;
d7671a3e 979
516a00e9 980 r = base64_append(&t, r,
d7671a3e
ZJS		 981 rr->dnskey.key, rr->dnskey.key_size,
982 8, columns());
983 if (r < 0)
984 return NULL;
985
516a00e9 986 r = asprintf(&s, "%s\n"
718af59e
ZJS		 987 " -- Flags:%s%s%s\n"
988 " -- Key tag: %u",
516a00e9 989 t,
99e5ca6d
ZJS		 990 rr->dnskey.flags & DNSKEY_FLAG_SEP ? " SEP" : "",
991 rr->dnskey.flags & DNSKEY_FLAG_REVOKE ? " REVOKE" : "",
fc8eec10 992 rr->dnskey.flags & DNSKEY_FLAG_ZONE_KEY ? " ZONE_KEY" : "",
fc8eec10 993 key_tag);
99e5ca6d
ZJS		 994 if (r < 0)
995 return NULL;
99e5ca6d 996
8db0d2f5 997 break;
ff3d6560 998 }
2d4c5cbc 999
151226ab 1000 case DNS_TYPE_RRSIG: {
8e54f5d9 1001 _cleanup_free_ char *alg = NULL;
fbd0b64f 1002 char expiration[STRLEN("YYYYMMDDHHmmSS") + 1], inception[STRLEN("YYYYMMDDHHmmSS") + 1];
8e54f5d9 1003 const char *type;
151226ab
ZJS		 1004
1005 type = dns_type_to_string(rr->rrsig.type_covered);
8e54f5d9
LP		 1006
1007 r = dnssec_algorithm_to_string_alloc(rr->rrsig.algorithm, &alg);
1008 if (r < 0)
1009 return NULL;
151226ab 1010
7c6423e1
TG		 1011 r = format_timestamp_dns(expiration, sizeof(expiration), rr->rrsig.expiration);
1012 if (r < 0)
7b50eb2e 1013 return NULL;
7c6423e1
TG		 1014
1015 r = format_timestamp_dns(inception, sizeof(inception), rr->rrsig.inception);
1016 if (r < 0)
7b50eb2e 1017 return NULL;
7c6423e1 1018
151226ab
ZJS		 1019 /* TYPE?? follows
1020 * http://tools.ietf.org/html/rfc3597#section-5 */
1021
4bb91a95 1022 r = asprintf(&s, "%s %s%.*u %s %u %u %s %s %u %s",
151226ab
ZJS		 1023 k,
1024 type ?: "TYPE",
1025 type ? 0 : 1, type ? 0u : (unsigned) rr->rrsig.type_covered,
8e54f5d9 1026 alg,
151226ab
ZJS		 1027 rr->rrsig.labels,
1028 rr->rrsig.original_ttl,
7c6423e1
TG		 1029 expiration,
1030 inception,
151226ab 1031 rr->rrsig.key_tag,
4bb91a95 1032 rr->rrsig.signer);
151226ab 1033 if (r < 0)
7b50eb2e 1034 return NULL;
d7671a3e 1035
4bb91a95 1036 r = base64_append(&s, r,
d7671a3e
ZJS		 1037 rr->rrsig.signature, rr->rrsig.signature_size,
1038 8, columns());
1039 if (r < 0)
1040 return NULL;
1041
151226ab
ZJS		 1042 break;
1043 }
1044
50f1e641
TG		 1045 case DNS_TYPE_NSEC:
1046 t = format_types(rr->nsec.types);
1047 if (!t)
7b50eb2e 1048 return NULL;
50f1e641
TG		 1049
1050 r = asprintf(&s, "%s %s %s",
1051 k,
1052 rr->nsec.next_domain_name,
1053 t);
1054 if (r < 0)
7b50eb2e 1055 return NULL;
50f1e641
TG		 1056 break;
1057
5d45a880
TG		 1058 case DNS_TYPE_NSEC3: {
1059 _cleanup_free_ char *salt = NULL, *hash = NULL;
1060
f5430a3e 1061 if (rr->nsec3.salt_size > 0) {
5d45a880
TG		 1062 salt = hexmem(rr->nsec3.salt, rr->nsec3.salt_size);
1063 if (!salt)
7b50eb2e 1064 return NULL;
5d45a880
TG		 1065 }
1066
1067 hash = base32hexmem(rr->nsec3.next_hashed_name, rr->nsec3.next_hashed_name_size, false);
1068 if (!hash)
7b50eb2e 1069 return NULL;
5d45a880
TG		 1070
1071 t = format_types(rr->nsec3.types);
1072 if (!t)
7b50eb2e 1073 return NULL;
5d45a880
TG		 1074
1075 r = asprintf(&s, "%s %"PRIu8" %"PRIu8" %"PRIu16" %s %s %s",
1076 k,
1077 rr->nsec3.algorithm,
1078 rr->nsec3.flags,
1079 rr->nsec3.iterations,
f5430a3e 1080 rr->nsec3.salt_size > 0 ? salt : "-",
5d45a880
TG		 1081 hash,
1082 t);
1083 if (r < 0)
7b50eb2e 1084 return NULL;
5d45a880
TG		 1085
1086 break;
1087 }
1088
48d45d2b 1089 case DNS_TYPE_TLSA: {
cfb90da3 1090 const char *cert_usage, *selector, *matching_type;
48d45d2b 1091
cfb90da3
ZJS		 1092 cert_usage = tlsa_cert_usage_to_string(rr->tlsa.cert_usage);
1093 selector = tlsa_selector_to_string(rr->tlsa.selector);
1094 matching_type = tlsa_matching_type_to_string(rr->tlsa.matching_type);
1095
236d312b
ZJS		 1096 t = hexmem(rr->sshfp.fingerprint, rr->sshfp.fingerprint_size);
1097 if (!t)
48d45d2b 1098 return NULL;
cfb90da3 1099
236d312b
ZJS		 1100 r = asprintf(&s,
1101 "%s %u %u %u %s\n"
718af59e
ZJS		 1102 " -- Cert. usage: %s\n"
1103 " -- Selector: %s\n"
1104 " -- Matching type: %s",
236d312b
ZJS		 1105 k,
1106 rr->tlsa.cert_usage,
1107 rr->tlsa.selector,
1108 rr->tlsa.matching_type,
1109 t,
718af59e
ZJS		 1110 cert_usage,
1111 selector,
1112 matching_type);
cfb90da3
ZJS		 1113 if (r < 0)
1114 return NULL;
cfb90da3 1115
48d45d2b
ZJS		 1116 break;
1117 }
1118
037e5b15
DT		 1119 case DNS_TYPE_CAA:
1120 t = octescape(rr->caa.value, rr->caa.value_size);
1121 if (!t)
95052df3
ZJS		 1122 return NULL;
1123
718af59e 1124 r = asprintf(&s, "%s %u %s \"%s\"%s%s%s%.0u",
95052df3
ZJS		 1125 k,
1126 rr->caa.flags,
1127 rr->caa.tag,
037e5b15 1128 t,
718af59e
ZJS		 1129 rr->caa.flags ? "\n -- Flags:" : "",
1130 rr->caa.flags & CAA_FLAG_CRITICAL ? " critical" : "",
1131 rr->caa.flags & ~CAA_FLAG_CRITICAL ? " " : "",
1132 rr->caa.flags & ~CAA_FLAG_CRITICAL);
95052df3
ZJS		 1133 if (r < 0)
1134 return NULL;
1135
1136 break;
95052df3 1137
eba1eb90 1138 case DNS_TYPE_OPENPGPKEY:
4bb91a95 1139 r = asprintf(&s, "%s", k);
d93a16b8
ZJS		 1140 if (r < 0)
1141 return NULL;
1142
4bb91a95 1143 r = base64_append(&s, r,
a43a068a 1144 rr->generic.data, rr->generic.data_size,
d93a16b8
ZJS		 1145 8, columns());
1146 if (r < 0)
1147 return NULL;
1148 break;
d93a16b8 1149
8db0d2f5 1150 default:
a43a068a 1151 t = hexmem(rr->generic.data, rr->generic.data_size);
8db0d2f5 1152 if (!t)
7b50eb2e 1153 return NULL;
8db0d2f5 1154
6af47493 1155 /* Format as documented in RFC 3597, Section 5 */
a43a068a 1156 r = asprintf(&s, "%s \\# %zu %s", k, rr->generic.data_size, t);
d23a27a9 1157 if (r < 0)
7b50eb2e 1158 return NULL;
2d4c5cbc 1159 break;
8db0d2f5 1160 }
2d4c5cbc 1161
7b50eb2e 1162 rr->to_string = s;
bc833401 1163 return TAKE_PTR(s);
2d4c5cbc 1164}
322345fd 1165
2e74028a
ZJS		 1166ssize_t dns_resource_record_payload(DnsResourceRecord *rr, void **out) {
1167 assert(rr);
1168 assert(out);
1169
52e085af 1170 switch(rr->unparsable ? _DNS_TYPE_INVALID : rr->key->type) {
2e74028a
ZJS		 1171 case DNS_TYPE_SRV:
1172 case DNS_TYPE_PTR:
1173 case DNS_TYPE_NS:
1174 case DNS_TYPE_CNAME:
1175 case DNS_TYPE_DNAME:
1176 case DNS_TYPE_HINFO:
1177 case DNS_TYPE_SPF:
1178 case DNS_TYPE_TXT:
1179 case DNS_TYPE_A:
1180 case DNS_TYPE_AAAA:
1181 case DNS_TYPE_SOA:
1182 case DNS_TYPE_MX:
1183 case DNS_TYPE_LOC:
1184 case DNS_TYPE_DS:
2e74028a
ZJS		 1185 case DNS_TYPE_DNSKEY:
1186 case DNS_TYPE_RRSIG:
1187 case DNS_TYPE_NSEC:
1188 case DNS_TYPE_NSEC3:
1189 return -EINVAL;
1190
e1caa6e0
ZJS		 1191 case DNS_TYPE_SSHFP:
1192 *out = rr->sshfp.fingerprint;
1193 return rr->sshfp.fingerprint_size;
1194
2e74028a
ZJS		 1195 case DNS_TYPE_TLSA:
1196 *out = rr->tlsa.data;
1197 return rr->tlsa.data_size;
1198
2e74028a
ZJS		 1199 case DNS_TYPE_OPENPGPKEY:
1200 default:
1201 *out = rr->generic.data;
1202 return rr->generic.data_size;
1203 }
1204}
1205
a8812dd7
LP		 1206int dns_resource_record_to_wire_format(DnsResourceRecord *rr, bool canonical) {
1207
1208 DnsPacket packet = {
1209 .n_ref = 1,
1210 .protocol = DNS_PROTOCOL_DNS,
1211 .on_stack = true,
1212 .refuse_compression = true,
1213 .canonical_form = canonical,
1214 };
1215
1216 size_t start, rds;
1217 int r;
1218
1219 assert(rr);
1220
1221 /* Generates the RR in wire-format, optionally in the
1222 * canonical form as discussed in the DNSSEC RFC 4034, Section
1223 * 6.2. We allocate a throw-away DnsPacket object on the stack
1224 * here, because we need some book-keeping for memory
1225 * management, and can reuse the DnsPacket serializer, that
1226 * can generate the canonical form, too, but also knows label
1227 * compression and suchlike. */
1228
1229 if (rr->wire_format && rr->wire_format_canonical == canonical)
1230 return 0;
1231
58ab31d5 1232 r = dns_packet_append_rr(&packet, rr, 0, &start, &rds);
a8812dd7
LP		 1233 if (r < 0)
1234 return r;
1235
1236 assert(start == 0);
1237 assert(packet._data);
1238
1239 free(rr->wire_format);
1240 rr->wire_format = packet._data;
1241 rr->wire_format_size = packet.size;
1242 rr->wire_format_rdata_offset = rds;
1243 rr->wire_format_canonical = canonical;
1244
1245 packet._data = NULL;
1246 dns_packet_unref(&packet);
1247
1248 return 0;
1249}
1250
97c67192
LP		 1251int dns_resource_record_signer(DnsResourceRecord *rr, const char **ret) {
1252 const char *n;
1253 int r;
1254
1255 assert(rr);
1256 assert(ret);
1257
1258 /* Returns the RRset's signer, if it is known. */
1259
98e80bf9 1260 if (rr->n_skip_labels_signer == UINT8_MAX)
97c67192
LP		 1261 return -ENODATA;
1262
1c02e7ba 1263 n = dns_resource_key_name(rr->key);
97c67192
LP		 1264 r = dns_name_skip(n, rr->n_skip_labels_signer, &n);
1265 if (r < 0)
1266 return r;
1267 if (r == 0)
1268 return -EINVAL;
1269
1270 *ret = n;
1271 return 0;
1272}
1273
1274int dns_resource_record_source(DnsResourceRecord *rr, const char **ret) {
1275 const char *n;
1276 int r;
1277
1278 assert(rr);
1279 assert(ret);
1280
1281 /* Returns the RRset's synthesizing source, if it is known. */
1282
98e80bf9 1283 if (rr->n_skip_labels_source == UINT8_MAX)
97c67192
LP		 1284 return -ENODATA;
1285
1c02e7ba 1286 n = dns_resource_key_name(rr->key);
97c67192
LP		 1287 r = dns_name_skip(n, rr->n_skip_labels_source, &n);
1288 if (r < 0)
1289 return r;
1290 if (r == 0)
1291 return -EINVAL;
1292
1293 *ret = n;
1294 return 0;
1295}
1296
1297int dns_resource_record_is_signer(DnsResourceRecord *rr, const char *zone) {
1298 const char *signer;
1299 int r;
1300
ab481675
LP		 1301 assert(rr);
1302
97c67192
LP		 1303 r = dns_resource_record_signer(rr, &signer);
1304 if (r < 0)
1305 return r;
1306
1307 return dns_name_equal(zone, signer);
1308}
1309
ab481675
LP		 1310int dns_resource_record_is_synthetic(DnsResourceRecord *rr) {
1311 int r;
1312
1313 assert(rr);
1314
1315 /* Returns > 0 if the RR is generated from a wildcard, and is not the asterisk name itself */
1316
98e80bf9 1317 if (rr->n_skip_labels_source == UINT8_MAX)
ab481675
LP		 1318 return -ENODATA;
1319
1320 if (rr->n_skip_labels_source == 0)
1321 return 0;
1322
1323 if (rr->n_skip_labels_source > 1)
1324 return 1;
1325
1c02e7ba 1326 r = dns_name_startswith(dns_resource_key_name(rr->key), "*");
ab481675
LP		 1327 if (r < 0)
1328 return r;
1329
1330 return !r;
1331}
1332
7a08d314 1333void dns_resource_record_hash_func(const DnsResourceRecord *rr, struct siphash *state) {
c9c72065
LP		 1334 assert(rr);
1335
1336 dns_resource_key_hash_func(rr->key, state);
1337
52e085af 1338 switch (rr->unparsable ? _DNS_TYPE_INVALID : rr->key->type) {
c9c72065
LP		 1339
1340 case DNS_TYPE_SRV:
1341 siphash24_compress(&rr->srv.priority, sizeof(rr->srv.priority), state);
1342 siphash24_compress(&rr->srv.weight, sizeof(rr->srv.weight), state);
1343 siphash24_compress(&rr->srv.port, sizeof(rr->srv.port), state);
1344 dns_name_hash_func(rr->srv.name, state);
1345 break;
1346
1347 case DNS_TYPE_PTR:
1348 case DNS_TYPE_NS:
1349 case DNS_TYPE_CNAME:
1350 case DNS_TYPE_DNAME:
1351 dns_name_hash_func(rr->ptr.name, state);
1352 break;
1353
1354 case DNS_TYPE_HINFO:
1355 string_hash_func(rr->hinfo.cpu, state);
1356 string_hash_func(rr->hinfo.os, state);
1357 break;
1358
1359 case DNS_TYPE_TXT:
1360 case DNS_TYPE_SPF: {
1361 DnsTxtItem *j;
1362
1363 LIST_FOREACH(items, j, rr->txt.items) {
b652ccca 1364 siphash24_compress_safe(j->data, j->length, state);
c9c72065 1365
d5115566
LP		 1366 /* Add an extra NUL byte, so that "a" followed by "b" doesn't result in the same hash as "ab"
1367 * followed by "". */
1368 siphash24_compress_byte(0, state);
c9c72065
LP		 1369 }
1370 break;
1371 }
1372
1373 case DNS_TYPE_A:
1374 siphash24_compress(&rr->a.in_addr, sizeof(rr->a.in_addr), state);
1375 break;
1376
1377 case DNS_TYPE_AAAA:
1378 siphash24_compress(&rr->aaaa.in6_addr, sizeof(rr->aaaa.in6_addr), state);
1379 break;
1380
1381 case DNS_TYPE_SOA:
1382 dns_name_hash_func(rr->soa.mname, state);
1383 dns_name_hash_func(rr->soa.rname, state);
1384 siphash24_compress(&rr->soa.serial, sizeof(rr->soa.serial), state);
1385 siphash24_compress(&rr->soa.refresh, sizeof(rr->soa.refresh), state);
1386 siphash24_compress(&rr->soa.retry, sizeof(rr->soa.retry), state);
1387 siphash24_compress(&rr->soa.expire, sizeof(rr->soa.expire), state);
1388 siphash24_compress(&rr->soa.minimum, sizeof(rr->soa.minimum), state);
1389 break;
1390
1391 case DNS_TYPE_MX:
1392 siphash24_compress(&rr->mx.priority, sizeof(rr->mx.priority), state);
1393 dns_name_hash_func(rr->mx.exchange, state);
1394 break;
1395
1396 case DNS_TYPE_LOC:
1397 siphash24_compress(&rr->loc.version, sizeof(rr->loc.version), state);
1398 siphash24_compress(&rr->loc.size, sizeof(rr->loc.size), state);
1399 siphash24_compress(&rr->loc.horiz_pre, sizeof(rr->loc.horiz_pre), state);
1400 siphash24_compress(&rr->loc.vert_pre, sizeof(rr->loc.vert_pre), state);
1401 siphash24_compress(&rr->loc.latitude, sizeof(rr->loc.latitude), state);
1402 siphash24_compress(&rr->loc.longitude, sizeof(rr->loc.longitude), state);
1403 siphash24_compress(&rr->loc.altitude, sizeof(rr->loc.altitude), state);
1404 break;
1405
1406 case DNS_TYPE_SSHFP:
1407 siphash24_compress(&rr->sshfp.algorithm, sizeof(rr->sshfp.algorithm), state);
1408 siphash24_compress(&rr->sshfp.fptype, sizeof(rr->sshfp.fptype), state);
b652ccca 1409 siphash24_compress_safe(rr->sshfp.fingerprint, rr->sshfp.fingerprint_size, state);
c9c72065
LP		 1410 break;
1411
1412 case DNS_TYPE_DNSKEY:
1413 siphash24_compress(&rr->dnskey.flags, sizeof(rr->dnskey.flags), state);
1414 siphash24_compress(&rr->dnskey.protocol, sizeof(rr->dnskey.protocol), state);
1415 siphash24_compress(&rr->dnskey.algorithm, sizeof(rr->dnskey.algorithm), state);
b652ccca 1416 siphash24_compress_safe(rr->dnskey.key, rr->dnskey.key_size, state);
c9c72065
LP		 1417 break;
1418
1419 case DNS_TYPE_RRSIG:
1420 siphash24_compress(&rr->rrsig.type_covered, sizeof(rr->rrsig.type_covered), state);
1421 siphash24_compress(&rr->rrsig.algorithm, sizeof(rr->rrsig.algorithm), state);
1422 siphash24_compress(&rr->rrsig.labels, sizeof(rr->rrsig.labels), state);
1423 siphash24_compress(&rr->rrsig.original_ttl, sizeof(rr->rrsig.original_ttl), state);
1424 siphash24_compress(&rr->rrsig.expiration, sizeof(rr->rrsig.expiration), state);
1425 siphash24_compress(&rr->rrsig.inception, sizeof(rr->rrsig.inception), state);
1426 siphash24_compress(&rr->rrsig.key_tag, sizeof(rr->rrsig.key_tag), state);
1427 dns_name_hash_func(rr->rrsig.signer, state);
b652ccca 1428 siphash24_compress_safe(rr->rrsig.signature, rr->rrsig.signature_size, state);
c9c72065
LP		 1429 break;
1430
1431 case DNS_TYPE_NSEC:
1432 dns_name_hash_func(rr->nsec.next_domain_name, state);
1433 /* FIXME: we leave out the type bitmap here. Hash
1434 * would be better if we'd take it into account
1435 * too. */
1436 break;
1437
1438 case DNS_TYPE_DS:
1439 siphash24_compress(&rr->ds.key_tag, sizeof(rr->ds.key_tag), state);
1440 siphash24_compress(&rr->ds.algorithm, sizeof(rr->ds.algorithm), state);
1441 siphash24_compress(&rr->ds.digest_type, sizeof(rr->ds.digest_type), state);
b652ccca 1442 siphash24_compress_safe(rr->ds.digest, rr->ds.digest_size, state);
c9c72065
LP		 1443 break;
1444
1445 case DNS_TYPE_NSEC3:
1446 siphash24_compress(&rr->nsec3.algorithm, sizeof(rr->nsec3.algorithm), state);
1447 siphash24_compress(&rr->nsec3.flags, sizeof(rr->nsec3.flags), state);
1448 siphash24_compress(&rr->nsec3.iterations, sizeof(rr->nsec3.iterations), state);
b652ccca
YW		 1449 siphash24_compress_safe(rr->nsec3.salt, rr->nsec3.salt_size, state);
1450 siphash24_compress_safe(rr->nsec3.next_hashed_name, rr->nsec3.next_hashed_name_size, state);
c9c72065
LP		 1451 /* FIXME: We leave the bitmaps out */
1452 break;
48d45d2b
ZJS		 1453
1454 case DNS_TYPE_TLSA:
1455 siphash24_compress(&rr->tlsa.cert_usage, sizeof(rr->tlsa.cert_usage), state);
1456 siphash24_compress(&rr->tlsa.selector, sizeof(rr->tlsa.selector), state);
1457 siphash24_compress(&rr->tlsa.matching_type, sizeof(rr->tlsa.matching_type), state);
b652ccca 1458 siphash24_compress_safe(rr->tlsa.data, rr->tlsa.data_size, state);
48d45d2b 1459 break;
c9c72065 1460
95052df3
ZJS		 1461 case DNS_TYPE_CAA:
1462 siphash24_compress(&rr->caa.flags, sizeof(rr->caa.flags), state);
1463 string_hash_func(rr->caa.tag, state);
b652ccca 1464 siphash24_compress_safe(rr->caa.value, rr->caa.value_size, state);
48d45d2b 1465 break;
c9c72065 1466
d93a16b8 1467 case DNS_TYPE_OPENPGPKEY:
c9c72065 1468 default:
b652ccca 1469 siphash24_compress_safe(rr->generic.data, rr->generic.data_size, state);
c9c72065
LP		 1470 break;
1471 }
1472}
1473
ae45e1a3 1474int dns_resource_record_compare_func(const DnsResourceRecord *x, const DnsResourceRecord *y) {
7a08d314 1475 int r;
c9c72065 1476
7a08d314
YW		 1477 r = dns_resource_key_compare_func(x->key, y->key);
1478 if (r != 0)
1479 return r;
c9c72065 1480
cd70fc37 1481 if (dns_resource_record_payload_equal(x, y) > 0)
c9c72065
LP		 1482 return 0;
1483
53c5797f
FB		 1484 /* We still use CMP() here, even though don't implement proper
1485 * ordering, since the hashtable doesn't need ordering anyway. */
1486 return CMP(x, y);
c9c72065
LP		 1487}
1488
7a08d314 1489DEFINE_HASH_OPS(dns_resource_record_hash_ops, DnsResourceRecord, dns_resource_record_hash_func, dns_resource_record_compare_func);
c9c72065 1490
17c8de63
LP		 1491DnsResourceRecord *dns_resource_record_copy(DnsResourceRecord *rr) {
1492 _cleanup_(dns_resource_record_unrefp) DnsResourceRecord *copy = NULL;
1493 DnsResourceRecord *t;
1494
1495 assert(rr);
1496
1497 copy = dns_resource_record_new(rr->key);
1498 if (!copy)
1499 return NULL;
1500
1501 copy->ttl = rr->ttl;
1502 copy->expiry = rr->expiry;
1503 copy->n_skip_labels_signer = rr->n_skip_labels_signer;
1504 copy->n_skip_labels_source = rr->n_skip_labels_source;
52e085af 1505 copy->unparsable = rr->unparsable;
17c8de63 1506
52e085af 1507 switch (rr->unparsable ? _DNS_TYPE_INVALID : rr->key->type) {
17c8de63
LP		 1508
1509 case DNS_TYPE_SRV:
1510 copy->srv.priority = rr->srv.priority;
1511 copy->srv.weight = rr->srv.weight;
1512 copy->srv.port = rr->srv.port;
1513 copy->srv.name = strdup(rr->srv.name);
1514 if (!copy->srv.name)
1515 return NULL;
1516 break;
1517
1518 case DNS_TYPE_PTR:
1519 case DNS_TYPE_NS:
1520 case DNS_TYPE_CNAME:
1521 case DNS_TYPE_DNAME:
1522 copy->ptr.name = strdup(rr->ptr.name);
1523 if (!copy->ptr.name)
1524 return NULL;
1525 break;
1526
1527 case DNS_TYPE_HINFO:
1528 copy->hinfo.cpu = strdup(rr->hinfo.cpu);
1529 if (!copy->hinfo.cpu)
1530 return NULL;
1531
1532 copy->hinfo.os = strdup(rr->hinfo.os);
508f63b4 1533 if (!copy->hinfo.os)
17c8de63
LP		 1534 return NULL;
1535 break;
1536
1537 case DNS_TYPE_TXT:
1538 case DNS_TYPE_SPF:
1539 copy->txt.items = dns_txt_item_copy(rr->txt.items);
1540 if (!copy->txt.items)
1541 return NULL;
1542 break;
1543
1544 case DNS_TYPE_A:
1545 copy->a = rr->a;
1546 break;
1547
1548 case DNS_TYPE_AAAA:
1549 copy->aaaa = rr->aaaa;
1550 break;
1551
1552 case DNS_TYPE_SOA:
1553 copy->soa.mname = strdup(rr->soa.mname);
1554 if (!copy->soa.mname)
1555 return NULL;
1556 copy->soa.rname = strdup(rr->soa.rname);
1557 if (!copy->soa.rname)
1558 return NULL;
1559 copy->soa.serial = rr->soa.serial;
1560 copy->soa.refresh = rr->soa.refresh;
1561 copy->soa.retry = rr->soa.retry;
1562 copy->soa.expire = rr->soa.expire;
1563 copy->soa.minimum = rr->soa.minimum;
1564 break;
1565
1566 case DNS_TYPE_MX:
1567 copy->mx.priority = rr->mx.priority;
1568 copy->mx.exchange = strdup(rr->mx.exchange);
1569 if (!copy->mx.exchange)
1570 return NULL;
1571 break;
1572
1573 case DNS_TYPE_LOC:
1574 copy->loc = rr->loc;
1575 break;
1576
1577 case DNS_TYPE_SSHFP:
1578 copy->sshfp.algorithm = rr->sshfp.algorithm;
1579 copy->sshfp.fptype = rr->sshfp.fptype;
1580 copy->sshfp.fingerprint = memdup(rr->sshfp.fingerprint, rr->sshfp.fingerprint_size);
1581 if (!copy->sshfp.fingerprint)
1582 return NULL;
1583 copy->sshfp.fingerprint_size = rr->sshfp.fingerprint_size;
1584 break;
1585
1586 case DNS_TYPE_DNSKEY:
1587 copy->dnskey.flags = rr->dnskey.flags;
1588 copy->dnskey.protocol = rr->dnskey.protocol;
1589 copy->dnskey.algorithm = rr->dnskey.algorithm;
1590 copy->dnskey.key = memdup(rr->dnskey.key, rr->dnskey.key_size);
1591 if (!copy->dnskey.key)
1592 return NULL;
1593 copy->dnskey.key_size = rr->dnskey.key_size;
1594 break;
1595
1596 case DNS_TYPE_RRSIG:
1597 copy->rrsig.type_covered = rr->rrsig.type_covered;
1598 copy->rrsig.algorithm = rr->rrsig.algorithm;
1599 copy->rrsig.labels = rr->rrsig.labels;
1600 copy->rrsig.original_ttl = rr->rrsig.original_ttl;
1601 copy->rrsig.expiration = rr->rrsig.expiration;
1602 copy->rrsig.inception = rr->rrsig.inception;
1603 copy->rrsig.key_tag = rr->rrsig.key_tag;
1604 copy->rrsig.signer = strdup(rr->rrsig.signer);
1605 if (!copy->rrsig.signer)
1606 return NULL;
1607 copy->rrsig.signature = memdup(rr->rrsig.signature, rr->rrsig.signature_size);
1608 if (!copy->rrsig.signature)
1609 return NULL;
1610 copy->rrsig.signature_size = rr->rrsig.signature_size;
1611 break;
1612
1613 case DNS_TYPE_NSEC:
1614 copy->nsec.next_domain_name = strdup(rr->nsec.next_domain_name);
1615 if (!copy->nsec.next_domain_name)
1616 return NULL;
1f00a50c
AT		 1617 if (rr->nsec.types) {
1618 copy->nsec.types = bitmap_copy(rr->nsec.types);
1619 if (!copy->nsec.types)
1620 return NULL;
1621 }
17c8de63
LP		 1622 break;
1623
1624 case DNS_TYPE_DS:
1625 copy->ds.key_tag = rr->ds.key_tag;
1626 copy->ds.algorithm = rr->ds.algorithm;
1627 copy->ds.digest_type = rr->ds.digest_type;
1628 copy->ds.digest = memdup(rr->ds.digest, rr->ds.digest_size);
1629 if (!copy->ds.digest)
1630 return NULL;
1631 copy->ds.digest_size = rr->ds.digest_size;
1632 break;
1633
1634 case DNS_TYPE_NSEC3:
1635 copy->nsec3.algorithm = rr->nsec3.algorithm;
1636 copy->nsec3.flags = rr->nsec3.flags;
1637 copy->nsec3.iterations = rr->nsec3.iterations;
1638 copy->nsec3.salt = memdup(rr->nsec3.salt, rr->nsec3.salt_size);
1639 if (!copy->nsec3.salt)
1640 return NULL;
1641 copy->nsec3.salt_size = rr->nsec3.salt_size;
1642 copy->nsec3.next_hashed_name = memdup(rr->nsec3.next_hashed_name, rr->nsec3.next_hashed_name_size);
a63a1252 1643 if (!copy->nsec3.next_hashed_name)
17c8de63
LP		 1644 return NULL;
1645 copy->nsec3.next_hashed_name_size = rr->nsec3.next_hashed_name_size;
1f00a50c
AT		 1646 if (rr->nsec3.types) {
1647 copy->nsec3.types = bitmap_copy(rr->nsec3.types);
1648 if (!copy->nsec3.types)
1649 return NULL;
1650 }
17c8de63
LP		 1651 break;
1652
1653 case DNS_TYPE_TLSA:
1654 copy->tlsa.cert_usage = rr->tlsa.cert_usage;
1655 copy->tlsa.selector = rr->tlsa.selector;
1656 copy->tlsa.matching_type = rr->tlsa.matching_type;
1657 copy->tlsa.data = memdup(rr->tlsa.data, rr->tlsa.data_size);
1658 if (!copy->tlsa.data)
1659 return NULL;
1660 copy->tlsa.data_size = rr->tlsa.data_size;
1661 break;
1662
1663 case DNS_TYPE_CAA:
1664 copy->caa.flags = rr->caa.flags;
1665 copy->caa.tag = strdup(rr->caa.tag);
1666 if (!copy->caa.tag)
1667 return NULL;
1668 copy->caa.value = memdup(rr->caa.value, rr->caa.value_size);
1669 if (!copy->caa.value)
1670 return NULL;
1671 copy->caa.value_size = rr->caa.value_size;
1672 break;
1673
1674 case DNS_TYPE_OPT:
1675 default:
1676 copy->generic.data = memdup(rr->generic.data, rr->generic.data_size);
1677 if (!copy->generic.data)
1678 return NULL;
1679 copy->generic.data_size = rr->generic.data_size;
1680 break;
1681 }
1682
1cc6c93a 1683 t = TAKE_PTR(copy);
17c8de63
LP		 1684
1685 return t;
1686}
1687
1688int dns_resource_record_clamp_ttl(DnsResourceRecord **rr, uint32_t max_ttl) {
1689 DnsResourceRecord *old_rr, *new_rr;
1690 uint32_t new_ttl;
1691
1692 assert(rr);
1693 old_rr = *rr;
1694
1695 if (old_rr->key->type == DNS_TYPE_OPT)
1696 return -EINVAL;
1697
1698 new_ttl = MIN(old_rr->ttl, max_ttl);
1699 if (new_ttl == old_rr->ttl)
1700 return 0;
1701
1702 if (old_rr->n_ref == 1) {
1703 /* Patch in place */
1704 old_rr->ttl = new_ttl;
1705 return 1;
1706 }
1707
1708 new_rr = dns_resource_record_copy(old_rr);
1709 if (!new_rr)
1710 return -ENOMEM;
1711
1712 new_rr->ttl = new_ttl;
1713
1714 dns_resource_record_unref(*rr);
1715 *rr = new_rr;
1716
1717 return 1;
1718}
1719
48662847 1720bool dns_resource_record_is_link_local_address(DnsResourceRecord *rr) {
d1f8fbea 1721 assert(rr);
48662847
LP		 1722
1723 if (rr->key->class != DNS_CLASS_IN)
1724 return false;
1725
1726 if (rr->key->type == DNS_TYPE_A)
1727 return in4_addr_is_link_local(&rr->a.in_addr);
1728
1729 if (rr->key->type == DNS_TYPE_AAAA)
94876904 1730 return in6_addr_is_link_local(&rr->aaaa.in6_addr);
48662847
LP		 1731
1732 return false;
1733}
1734
d1f8fbea
LP		 1735int dns_resource_record_get_cname_target(DnsResourceKey *key, DnsResourceRecord *cname, char **ret) {
1736 _cleanup_free_ char *d = NULL;
1737 int r;
1738
1739 assert(key);
1740 assert(cname);
1741
d2995826
LP		 1742 /* Checks if the RR `cname` is a CNAME/DNAME RR that matches the specified `key`. If so, returns the
1743 * target domain. If not, returns -EUNATCH */
1744
d1f8fbea
LP		 1745 if (key->class != cname->key->class && key->class != DNS_CLASS_ANY)
1746 return -EUNATCH;
1747
d2995826
LP		 1748 if (!dns_type_may_redirect(key->type)) /* This key type is not subject to CNAME/DNAME redirection?
1749 * Then let's refuse right-away */
1750 return -EUNATCH;
1751
d1f8fbea
LP		 1752 if (cname->key->type == DNS_TYPE_CNAME) {
1753 r = dns_name_equal(dns_resource_key_name(key),
1754 dns_resource_key_name(cname->key));
1755 if (r < 0)
1756 return r;
1757 if (r == 0)
1758 return -EUNATCH; /* CNAME RR key doesn't actually match the original key */
1759
1760 d = strdup(cname->cname.name);
1761 if (!d)
1762 return -ENOMEM;
1763
1764 } else if (cname->key->type == DNS_TYPE_DNAME) {
1765
1766 r = dns_name_change_suffix(
1767 dns_resource_key_name(key),
1768 dns_resource_key_name(cname->key),
1769 cname->dname.name,
1770 &d);
1771 if (r < 0)
1772 return r;
1773 if (r == 0)
1774 return -EUNATCH; /* DNAME RR key doesn't actually match the original key */
1775
1776 } else
1777 return -EUNATCH; /* Not a CNAME/DNAME RR, hence doesn't match the proposition either */
1778
1779 *ret = TAKE_PTR(d);
1780 return 0;
1781}
1782
2001c805
LP		 1783DnsTxtItem *dns_txt_item_free_all(DnsTxtItem *i) {
1784 DnsTxtItem *n;
1785
1786 if (!i)
1787 return NULL;
1788
1789 n = i->items_next;
1790
1791 free(i);
1792 return dns_txt_item_free_all(n);
1793}
1794
1795bool dns_txt_item_equal(DnsTxtItem *a, DnsTxtItem *b) {
1796
4d247a6c
LP		 1797 if (a == b)
1798 return true;
1799
2001c805
LP		 1800 if (!a != !b)
1801 return false;
1802
1803 if (!a)
1804 return true;
1805
1806 if (a->length != b->length)
1807 return false;
1808
1809 if (memcmp(a->data, b->data, a->length) != 0)
1810 return false;
1811
1812 return dns_txt_item_equal(a->items_next, b->items_next);
1813}
8730bccf 1814
17c8de63
LP		 1815DnsTxtItem *dns_txt_item_copy(DnsTxtItem *first) {
1816 DnsTxtItem *i, *copy = NULL, *end = NULL;
1817
1818 LIST_FOREACH(items, i, first) {
1819 DnsTxtItem *j;
1820
1821 j = memdup(i, offsetof(DnsTxtItem, data) + i->length + 1);
1822 if (!j) {
1823 dns_txt_item_free_all(copy);
1824 return NULL;
1825 }
1826
1827 LIST_INSERT_AFTER(items, copy, end, j);
1828 end = j;
1829 }
1830
1831 return copy;
1832}
1833
ebb779dc
DR		 1834int dns_txt_item_new_empty(DnsTxtItem **ret) {
1835 DnsTxtItem *i;
1836
1837 /* RFC 6763, section 6.1 suggests to treat
1838 * empty TXT RRs as equivalent to a TXT record
1839 * with a single empty string. */
1840
1841 i = malloc0(offsetof(DnsTxtItem, data) + 1); /* for safety reasons we add an extra NUL byte */
1842 if (!i)
1843 return -ENOMEM;
1844
1845 *ret = i;
1846
1847 return 0;
1848}
1849
8730bccf 1850static const char* const dnssec_algorithm_table[_DNSSEC_ALGORITHM_MAX_DEFINED] = {
6f717d08 1851 /* Mnemonics as listed on https://www.iana.org/assignments/dns-sec-alg-numbers/dns-sec-alg-numbers.xhtml */
8730bccf
LP		 1852 [DNSSEC_ALGORITHM_RSAMD5] = "RSAMD5",
1853 [DNSSEC_ALGORITHM_DH] = "DH",
1854 [DNSSEC_ALGORITHM_DSA] = "DSA",
1855 [DNSSEC_ALGORITHM_ECC] = "ECC",
1856 [DNSSEC_ALGORITHM_RSASHA1] = "RSASHA1",
1857 [DNSSEC_ALGORITHM_DSA_NSEC3_SHA1] = "DSA-NSEC3-SHA1",
1858 [DNSSEC_ALGORITHM_RSASHA1_NSEC3_SHA1] = "RSASHA1-NSEC3-SHA1",
1859 [DNSSEC_ALGORITHM_RSASHA256] = "RSASHA256",
1860 [DNSSEC_ALGORITHM_RSASHA512] = "RSASHA512",
6f717d08
LP		 1861 [DNSSEC_ALGORITHM_ECC_GOST] = "ECC-GOST",
1862 [DNSSEC_ALGORITHM_ECDSAP256SHA256] = "ECDSAP256SHA256",
1863 [DNSSEC_ALGORITHM_ECDSAP384SHA384] = "ECDSAP384SHA384",
cb9eeb06
MCO		 1864 [DNSSEC_ALGORITHM_ED25519] = "ED25519",
1865 [DNSSEC_ALGORITHM_ED448] = "ED448",
8730bccf
LP		 1866 [DNSSEC_ALGORITHM_INDIRECT] = "INDIRECT",
1867 [DNSSEC_ALGORITHM_PRIVATEDNS] = "PRIVATEDNS",
1868 [DNSSEC_ALGORITHM_PRIVATEOID] = "PRIVATEOID",
1869};
8e54f5d9 1870DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(dnssec_algorithm, int, 255);
8730bccf
LP		 1871
1872static const char* const dnssec_digest_table[_DNSSEC_DIGEST_MAX_DEFINED] = {
6f717d08 1873 /* Names as listed on https://www.iana.org/assignments/ds-rr-types/ds-rr-types.xhtml */
e3e64a1a
ZJS		 1874 [DNSSEC_DIGEST_SHA1] = "SHA-1",
1875 [DNSSEC_DIGEST_SHA256] = "SHA-256",
6f717d08 1876 [DNSSEC_DIGEST_GOST_R_34_11_94] = "GOST_R_34.11-94",
e3e64a1a 1877 [DNSSEC_DIGEST_SHA384] = "SHA-384",
8730bccf 1878};
8e54f5d9 1879DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(dnssec_digest, int, 255);
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