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resolve: format zero-length RDATA according to rfc3597
[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),
c0f86d66
JJ		 328 strempty(c), c ? "" : "CLASS", c ? 0u : key->class,
329 strempty(t), t ? "" : "TYPE", t ? 0u : 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. */
57318441
ZJS		 363 if ((*a)->n_ref > (*b)->n_ref)
364 DNS_RESOURCE_KEY_REPLACE(*b, dns_resource_key_ref(*a));
365 else
366 DNS_RESOURCE_KEY_REPLACE(*a, dns_resource_key_ref(*b));
f57e3cd5
LP		 367
368 return true;
369}
370
faa133f3 371DnsResourceRecord* dns_resource_record_new(DnsResourceKey *key) {
74b2466e
LP		 372 DnsResourceRecord *rr;
373
1ed31408 374 rr = new(DnsResourceRecord, 1);
74b2466e
LP		 375 if (!rr)
376 return NULL;
377
1ed31408
LP		 378 *rr = (DnsResourceRecord) {
379 .n_ref = 1,
380 .key = dns_resource_key_ref(key),
381 .expiry = USEC_INFINITY,
98e80bf9
ZJS		 382 .n_skip_labels_signer = UINT8_MAX,
383 .n_skip_labels_source = UINT8_MAX,
1ed31408 384 };
faa133f3 385
74b2466e
LP		 386 return rr;
387}
388
8bf52d3d
LP		 389DnsResourceRecord* dns_resource_record_new_full(uint16_t class, uint16_t type, const char *name) {
390 _cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL;
391
392 key = dns_resource_key_new(class, type, name);
393 if (!key)
394 return NULL;
395
396 return dns_resource_record_new(key);
397}
398
8301aa0b
YW		 399static DnsResourceRecord* dns_resource_record_free(DnsResourceRecord *rr) {
400 assert(rr);
74b2466e 401
faa133f3 402 if (rr->key) {
79893116 403 switch (rr->key->type) {
9c92ce6d
LP		 404
405 case DNS_TYPE_SRV:
406 free(rr->srv.name);
407 break;
408
9de3e329
ZJS		 409 case DNS_TYPE_PTR:
410 case DNS_TYPE_NS:
411 case DNS_TYPE_CNAME:
8ac4e9e1 412 case DNS_TYPE_DNAME:
faa133f3 413 free(rr->ptr.name);
9de3e329 414 break;
9c92ce6d 415
9de3e329 416 case DNS_TYPE_HINFO:
faa133f3
LP		 417 free(rr->hinfo.cpu);
418 free(rr->hinfo.os);
9de3e329 419 break;
9c92ce6d 420
9de3e329 421 case DNS_TYPE_TXT:
9c92ce6d 422 case DNS_TYPE_SPF:
2001c805 423 dns_txt_item_free_all(rr->txt.items);
9de3e329 424 break;
9c92ce6d 425
9de3e329 426 case DNS_TYPE_SOA:
7e8e0422
LP		 427 free(rr->soa.mname);
428 free(rr->soa.rname);
9de3e329 429 break;
9c92ce6d 430
9de3e329 431 case DNS_TYPE_MX:
946c7094 432 free(rr->mx.exchange);
9de3e329 433 break;
9c92ce6d 434
abf126a3
TG		 435 case DNS_TYPE_DS:
436 free(rr->ds.digest);
437 break;
438
42cc2eeb 439 case DNS_TYPE_SSHFP:
549c1a25 440 free(rr->sshfp.fingerprint);
42cc2eeb
LP		 441 break;
442
8db0d2f5
ZJS		 443 case DNS_TYPE_DNSKEY:
444 free(rr->dnskey.key);
445 break;
446
151226ab
ZJS		 447 case DNS_TYPE_RRSIG:
448 free(rr->rrsig.signer);
449 free(rr->rrsig.signature);
450 break;
451
50f1e641
TG		 452 case DNS_TYPE_NSEC:
453 free(rr->nsec.next_domain_name);
454 bitmap_free(rr->nsec.types);
455 break;
456
5d45a880
TG		 457 case DNS_TYPE_NSEC3:
458 free(rr->nsec3.next_hashed_name);
459 free(rr->nsec3.salt);
460 bitmap_free(rr->nsec3.types);
461 break;
462
0dae31d4 463 case DNS_TYPE_LOC:
9de3e329
ZJS		 464 case DNS_TYPE_A:
465 case DNS_TYPE_AAAA:
466 break;
9c92ce6d 467
48d45d2b
ZJS		 468 case DNS_TYPE_TLSA:
469 free(rr->tlsa.data);
470 break;
471
95052df3
ZJS		 472 case DNS_TYPE_CAA:
473 free(rr->caa.tag);
474 free(rr->caa.value);
475 break;
476
d93a16b8 477 case DNS_TYPE_OPENPGPKEY:
9de3e329 478 default:
52e085af 479 if (!rr->unparsable)
bfc1d734 480 free(rr->generic.data);
9de3e329 481 }
322345fd 482
52e085af 483 if (rr->unparsable)
bfc1d734
ZJS		 484 free(rr->generic.data);
485
a8812dd7 486 free(rr->wire_format);
faa133f3
LP		 487 dns_resource_key_unref(rr->key);
488 }
322345fd 489
7b50eb2e 490 free(rr->to_string);
6b430fdb 491 return mfree(rr);
322345fd
LP		 492}
493
8301aa0b
YW		 494DEFINE_TRIVIAL_REF_UNREF_FUNC(DnsResourceRecord, dns_resource_record, dns_resource_record_free);
495
623a4c97
LP		 496int dns_resource_record_new_reverse(DnsResourceRecord **ret, int family, const union in_addr_union *address, const char *hostname) {
497 _cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL;
498 _cleanup_(dns_resource_record_unrefp) DnsResourceRecord *rr = NULL;
499 _cleanup_free_ char *ptr = NULL;
500 int r;
501
502 assert(ret);
503 assert(address);
504 assert(hostname);
505
506 r = dns_name_reverse(family, address, &ptr);
507 if (r < 0)
508 return r;
509
510 key = dns_resource_key_new_consume(DNS_CLASS_IN, DNS_TYPE_PTR, ptr);
511 if (!key)
512 return -ENOMEM;
513
514 ptr = NULL;
515
516 rr = dns_resource_record_new(key);
517 if (!rr)
518 return -ENOMEM;
519
520 rr->ptr.name = strdup(hostname);
521 if (!rr->ptr.name)
522 return -ENOMEM;
523
1cc6c93a 524 *ret = TAKE_PTR(rr);
623a4c97
LP		 525
526 return 0;
527}
528
78c6a153
LP		 529int dns_resource_record_new_address(DnsResourceRecord **ret, int family, const union in_addr_union *address, const char *name) {
530 DnsResourceRecord *rr;
531
532 assert(ret);
533 assert(address);
534 assert(family);
535
536 if (family == AF_INET) {
537
538 rr = dns_resource_record_new_full(DNS_CLASS_IN, DNS_TYPE_A, name);
539 if (!rr)
540 return -ENOMEM;
541
542 rr->a.in_addr = address->in;
543
544 } else if (family == AF_INET6) {
545
546 rr = dns_resource_record_new_full(DNS_CLASS_IN, DNS_TYPE_AAAA, name);
547 if (!rr)
548 return -ENOMEM;
549
550 rr->aaaa.in6_addr = address->in6;
551 } else
552 return -EAFNOSUPPORT;
553
554 *ret = rr;
555
556 return 0;
557}
558
a43a068a
ZJS		 559#define FIELD_EQUAL(a, b, field) \
560 ((a).field ## _size == (b).field ## _size && \
9bd2422a 561 memcmp_safe((a).field, (b).field, (a).field ## _size) == 0)
a43a068a 562
51969a58 563int dns_resource_record_payload_equal(const DnsResourceRecord *a, const DnsResourceRecord *b) {
322345fd
LP		 564 int r;
565
51969a58 566 /* Check if a and b are the same, but don't look at their keys */
322345fd 567
52e085af 568 if (a->unparsable != b->unparsable)
fd0b4602
LP		 569 return 0;
570
52e085af 571 switch (a->unparsable ? _DNS_TYPE_INVALID : a->key->type) {
2d4c5cbc 572
9c92ce6d
LP		 573 case DNS_TYPE_SRV:
574 r = dns_name_equal(a->srv.name, b->srv.name);
575 if (r <= 0)
576 return r;
577
578 return a->srv.priority == b->srv.priority &&
579 a->srv.weight == b->srv.weight &&
580 a->srv.port == b->srv.port;
581
2d4c5cbc
LP		 582 case DNS_TYPE_PTR:
583 case DNS_TYPE_NS:
584 case DNS_TYPE_CNAME:
8ac4e9e1 585 case DNS_TYPE_DNAME:
322345fd 586 return dns_name_equal(a->ptr.name, b->ptr.name);
2d4c5cbc
LP		 587
588 case DNS_TYPE_HINFO:
589 return strcaseeq(a->hinfo.cpu, b->hinfo.cpu) &&
590 strcaseeq(a->hinfo.os, b->hinfo.os);
591
9de3e329 592 case DNS_TYPE_SPF: /* exactly the same as TXT */
0f84a72e 593 case DNS_TYPE_TXT:
2001c805 594 return dns_txt_item_equal(a->txt.items, b->txt.items);
2e276efc 595
2d4c5cbc 596 case DNS_TYPE_A:
322345fd 597 return memcmp(&a->a.in_addr, &b->a.in_addr, sizeof(struct in_addr)) == 0;
2d4c5cbc
LP		 598
599 case DNS_TYPE_AAAA:
322345fd 600 return memcmp(&a->aaaa.in6_addr, &b->aaaa.in6_addr, sizeof(struct in6_addr)) == 0;
2d4c5cbc
LP		 601
602 case DNS_TYPE_SOA:
7e8e0422
LP		 603 r = dns_name_equal(a->soa.mname, b->soa.mname);
604 if (r <= 0)
605 return r;
606 r = dns_name_equal(a->soa.rname, b->soa.rname);
607 if (r <= 0)
608 return r;
609
610 return a->soa.serial == b->soa.serial &&
611 a->soa.refresh == b->soa.refresh &&
612 a->soa.retry == b->soa.retry &&
613 a->soa.expire == b->soa.expire &&
614 a->soa.minimum == b->soa.minimum;
9c92ce6d 615
946c7094
ZJS		 616 case DNS_TYPE_MX:
617 if (a->mx.priority != b->mx.priority)
618 return 0;
619
620 return dns_name_equal(a->mx.exchange, b->mx.exchange);
621
0dae31d4
ZJS		 622 case DNS_TYPE_LOC:
623 assert(a->loc.version == b->loc.version);
624
625 return a->loc.size == b->loc.size &&
626 a->loc.horiz_pre == b->loc.horiz_pre &&
627 a->loc.vert_pre == b->loc.vert_pre &&
628 a->loc.latitude == b->loc.latitude &&
629 a->loc.longitude == b->loc.longitude &&
630 a->loc.altitude == b->loc.altitude;
631
abf126a3
TG		 632 case DNS_TYPE_DS:
633 return a->ds.key_tag == b->ds.key_tag &&
634 a->ds.algorithm == b->ds.algorithm &&
635 a->ds.digest_type == b->ds.digest_type &&
a43a068a 636 FIELD_EQUAL(a->ds, b->ds, digest);
abf126a3 637
42cc2eeb
LP		 638 case DNS_TYPE_SSHFP:
639 return a->sshfp.algorithm == b->sshfp.algorithm &&
640 a->sshfp.fptype == b->sshfp.fptype &&
a43a068a 641 FIELD_EQUAL(a->sshfp, b->sshfp, fingerprint);
42cc2eeb 642
8db0d2f5 643 case DNS_TYPE_DNSKEY:
f91dc240
LP		 644 return a->dnskey.flags == b->dnskey.flags &&
645 a->dnskey.protocol == b->dnskey.protocol &&
8db0d2f5 646 a->dnskey.algorithm == b->dnskey.algorithm &&
a43a068a 647 FIELD_EQUAL(a->dnskey, b->dnskey, key);
8db0d2f5 648
151226ab
ZJS		 649 case DNS_TYPE_RRSIG:
650 /* do the fast comparisons first */
a43a068a
ZJS		 651 return a->rrsig.type_covered == b->rrsig.type_covered &&
652 a->rrsig.algorithm == b->rrsig.algorithm &&
653 a->rrsig.labels == b->rrsig.labels &&
654 a->rrsig.original_ttl == b->rrsig.original_ttl &&
655 a->rrsig.expiration == b->rrsig.expiration &&
656 a->rrsig.inception == b->rrsig.inception &&
657 a->rrsig.key_tag == b->rrsig.key_tag &&
658 FIELD_EQUAL(a->rrsig, b->rrsig, signature) &&
659 dns_name_equal(a->rrsig.signer, b->rrsig.signer);
151226ab 660
50f1e641
TG		 661 case DNS_TYPE_NSEC:
662 return dns_name_equal(a->nsec.next_domain_name, b->nsec.next_domain_name) &&
663 bitmap_equal(a->nsec.types, b->nsec.types);
664
5d45a880
TG		 665 case DNS_TYPE_NSEC3:
666 return a->nsec3.algorithm == b->nsec3.algorithm &&
a43a068a
ZJS		 667 a->nsec3.flags == b->nsec3.flags &&
668 a->nsec3.iterations == b->nsec3.iterations &&
669 FIELD_EQUAL(a->nsec3, b->nsec3, salt) &&
670 FIELD_EQUAL(a->nsec3, b->nsec3, next_hashed_name) &&
671 bitmap_equal(a->nsec3.types, b->nsec3.types);
5d45a880 672
48d45d2b
ZJS		 673 case DNS_TYPE_TLSA:
674 return a->tlsa.cert_usage == b->tlsa.cert_usage &&
675 a->tlsa.selector == b->tlsa.selector &&
676 a->tlsa.matching_type == b->tlsa.matching_type &&
a43a068a 677 FIELD_EQUAL(a->tlsa, b->tlsa, data);
48d45d2b 678
95052df3
ZJS		 679 case DNS_TYPE_CAA:
680 return a->caa.flags == b->caa.flags &&
681 streq(a->caa.tag, b->caa.tag) &&
682 FIELD_EQUAL(a->caa, b->caa, value);
683
684 case DNS_TYPE_OPENPGPKEY:
2d4c5cbc 685 default:
a43a068a 686 return FIELD_EQUAL(a->generic, b->generic, data);
2d4c5cbc 687 }
322345fd
LP		 688}
689
51969a58
ZJS		 690int dns_resource_record_equal(const DnsResourceRecord *a, const DnsResourceRecord *b) {
691 int r;
692
693 assert(a);
694 assert(b);
695
696 if (a == b)
697 return 1;
698
699 r = dns_resource_key_equal(a->key, b->key);
700 if (r <= 0)
701 return r;
702
703 return dns_resource_record_payload_equal(a, b);
704}
705
0dae31d4
ZJS		 706static char* format_location(uint32_t latitude, uint32_t longitude, uint32_t altitude,
707 uint8_t size, uint8_t horiz_pre, uint8_t vert_pre) {
708 char *s;
709 char NS = latitude >= 1U<<31 ? 'N' : 'S';
710 char EW = longitude >= 1U<<31 ? 'E' : 'W';
711
712 int lat = latitude >= 1U<<31 ? (int) (latitude - (1U<<31)) : (int) ((1U<<31) - latitude);
713 int lon = longitude >= 1U<<31 ? (int) (longitude - (1U<<31)) : (int) ((1U<<31) - longitude);
714 double alt = altitude >= 10000000u ? altitude - 10000000u : -(double)(10000000u - altitude);
715 double siz = (size >> 4) * exp10((double) (size & 0xF));
716 double hor = (horiz_pre >> 4) * exp10((double) (horiz_pre & 0xF));
717 double ver = (vert_pre >> 4) * exp10((double) (vert_pre & 0xF));
718
719 if (asprintf(&s, "%d %d %.3f %c %d %d %.3f %c %.2fm %.2fm %.2fm %.2fm",
720 (lat / 60000 / 60),
721 (lat / 60000) % 60,
722 (lat % 60000) / 1000.,
723 NS,
724 (lon / 60000 / 60),
725 (lon / 60000) % 60,
726 (lon % 60000) / 1000.,
727 EW,
728 alt / 100.,
729 siz / 100.,
730 hor / 100.,
731 ver / 100.) < 0)
732 return NULL;
733
734 return s;
735}
736
7c6423e1
TG		 737static int format_timestamp_dns(char *buf, size_t l, time_t sec) {
738 struct tm tm;
739
740 assert(buf);
fbd0b64f 741 assert(l > STRLEN("YYYYMMDDHHmmSS"));
7c6423e1
TG		 742
743 if (!gmtime_r(&sec, &tm))
744 return -EINVAL;
745
746 if (strftime(buf, l, "%Y%m%d%H%M%S", &tm) <= 0)
747 return -EINVAL;
748
749 return 0;
750}
751
50f1e641
TG		 752static char *format_types(Bitmap *types) {
753 _cleanup_strv_free_ char **strv = NULL;
754 _cleanup_free_ char *str = NULL;
755 unsigned type;
756 int r;
757
90e74a66 758 BITMAP_FOREACH(type, types) {
50f1e641 759 if (dns_type_to_string(type)) {
2c1fb4f7 760 r = strv_extend(&strv, dns_type_to_string(type));
50f1e641
TG		 761 if (r < 0)
762 return NULL;
763 } else {
764 char *t;
765
766 r = asprintf(&t, "TYPE%u", type);
767 if (r < 0)
768 return NULL;
769
2c1fb4f7 770 r = strv_consume(&strv, t);
50f1e641
TG		 771 if (r < 0)
772 return NULL;
773 }
774 }
775
776 str = strv_join(strv, " ");
777 if (!str)
778 return NULL;
779
605405c6 780 return strjoin("( ", str, " )");
50f1e641
TG		 781}
782
2001c805 783static char *format_txt(DnsTxtItem *first) {
2001c805
LP		 784 size_t c = 1;
785 char *p, *s;
786
787 LIST_FOREACH(items, i, first)
788 c += i->length * 4 + 3;
789
790 p = s = new(char, c);
791 if (!s)
792 return NULL;
793
794 LIST_FOREACH(items, i, first) {
2001c805
LP		 795 if (i != first)
796 *(p++) = ' ';
797
798 *(p++) = '"';
799
6f1d18ae 800 for (size_t j = 0; j < i->length; j++) {
2001c805
LP		 801 if (i->data[j] < ' ' || i->data[j] == '"' || i->data[j] >= 127) {
802 *(p++) = '\\';
803 *(p++) = '0' + (i->data[j] / 100);
804 *(p++) = '0' + ((i->data[j] / 10) % 10);
805 *(p++) = '0' + (i->data[j] % 10);
806 } else
807 *(p++) = i->data[j];
808 }
809
810 *(p++) = '"';
811 }
812
813 *p = 0;
814 return s;
815}
816
7b50eb2e 817const char *dns_resource_record_to_string(DnsResourceRecord *rr) {
bc833401
DT		 818 _cleanup_free_ char *s = NULL, *t = NULL;
819 char k[DNS_RESOURCE_KEY_STRING_MAX];
2d4c5cbc 820 int r;
322345fd 821
2d4c5cbc 822 assert(rr);
322345fd 823
7b50eb2e
LP		 824 if (rr->to_string)
825 return rr->to_string;
826
202b76ae 827 dns_resource_key_to_string(rr->key, k, sizeof(k));
322345fd 828
52e085af 829 switch (rr->unparsable ? _DNS_TYPE_INVALID : rr->key->type) {
322345fd 830
9c92ce6d
LP		 831 case DNS_TYPE_SRV:
832 r = asprintf(&s, "%s %u %u %u %s",
833 k,
834 rr->srv.priority,
835 rr->srv.weight,
836 rr->srv.port,
837 strna(rr->srv.name));
838 if (r < 0)
7b50eb2e 839 return NULL;
9c92ce6d
LP		 840 break;
841
2d4c5cbc
LP		 842 case DNS_TYPE_PTR:
843 case DNS_TYPE_NS:
844 case DNS_TYPE_CNAME:
8ac4e9e1 845 case DNS_TYPE_DNAME:
605405c6 846 s = strjoin(k, " ", rr->ptr.name);
2d4c5cbc 847 if (!s)
7b50eb2e 848 return NULL;
322345fd 849
2d4c5cbc 850 break;
322345fd 851
2d4c5cbc 852 case DNS_TYPE_HINFO:
605405c6 853 s = strjoin(k, " ", rr->hinfo.cpu, " ", rr->hinfo.os);
2d4c5cbc 854 if (!s)
7b50eb2e 855 return NULL;
2d4c5cbc 856 break;
322345fd 857
9de3e329 858 case DNS_TYPE_SPF: /* exactly the same as TXT */
8db0d2f5 859 case DNS_TYPE_TXT:
2001c805 860 t = format_txt(rr->txt.items);
2e276efc 861 if (!t)
7b50eb2e 862 return NULL;
2e276efc 863
605405c6 864 s = strjoin(k, " ", t);
2e276efc 865 if (!s)
7b50eb2e 866 return NULL;
2e276efc 867 break;
2e276efc 868
037e5b15
DT		 869 case DNS_TYPE_A:
870 r = in_addr_to_string(AF_INET, (const union in_addr_union*) &rr->a.in_addr, &t);
2d4c5cbc 871 if (r < 0)
7b50eb2e 872 return NULL;
322345fd 873
037e5b15 874 s = strjoin(k, " ", t);
2d4c5cbc 875 if (!s)
7b50eb2e 876 return NULL;
2d4c5cbc 877 break;
322345fd 878
8db0d2f5
ZJS		 879 case DNS_TYPE_AAAA:
880 r = in_addr_to_string(AF_INET6, (const union in_addr_union*) &rr->aaaa.in6_addr, &t);
2d4c5cbc 881 if (r < 0)
7b50eb2e 882 return NULL;
322345fd 883
605405c6 884 s = strjoin(k, " ", t);
2d4c5cbc 885 if (!s)
7b50eb2e 886 return NULL;
2d4c5cbc 887 break;
322345fd 888
2d4c5cbc
LP		 889 case DNS_TYPE_SOA:
890 r = asprintf(&s, "%s %s %s %u %u %u %u %u",
891 k,
892 strna(rr->soa.mname),
893 strna(rr->soa.rname),
894 rr->soa.serial,
895 rr->soa.refresh,
896 rr->soa.retry,
897 rr->soa.expire,
898 rr->soa.minimum);
899 if (r < 0)
7b50eb2e 900 return NULL;
2d4c5cbc
LP		 901 break;
902
946c7094
ZJS		 903 case DNS_TYPE_MX:
904 r = asprintf(&s, "%s %u %s",
905 k,
906 rr->mx.priority,
907 rr->mx.exchange);
908 if (r < 0)
7b50eb2e 909 return NULL;
946c7094
ZJS		 910 break;
911
8db0d2f5 912 case DNS_TYPE_LOC:
0dae31d4
ZJS		 913 assert(rr->loc.version == 0);
914
8db0d2f5
ZJS		 915 t = format_location(rr->loc.latitude,
916 rr->loc.longitude,
917 rr->loc.altitude,
918 rr->loc.size,
919 rr->loc.horiz_pre,
920 rr->loc.vert_pre);
921 if (!t)
7b50eb2e 922 return NULL;
0dae31d4 923
605405c6 924 s = strjoin(k, " ", t);
0dae31d4 925 if (!s)
7b50eb2e 926 return NULL;
0dae31d4 927 break;
0dae31d4 928
abf126a3
TG		 929 case DNS_TYPE_DS:
930 t = hexmem(rr->ds.digest, rr->ds.digest_size);
931 if (!t)
7b50eb2e 932 return NULL;
abf126a3
TG		 933
934 r = asprintf(&s, "%s %u %u %u %s",
935 k,
936 rr->ds.key_tag,
937 rr->ds.algorithm,
938 rr->ds.digest_type,
939 t);
940 if (r < 0)
7b50eb2e 941 return NULL;
abf126a3
TG		 942 break;
943
8db0d2f5 944 case DNS_TYPE_SSHFP:
549c1a25 945 t = hexmem(rr->sshfp.fingerprint, rr->sshfp.fingerprint_size);
8db0d2f5 946 if (!t)
7b50eb2e 947 return NULL;
42cc2eeb
LP		 948
949 r = asprintf(&s, "%s %u %u %s",
950 k,
951 rr->sshfp.algorithm,
952 rr->sshfp.fptype,
8db0d2f5 953 t);
42cc2eeb 954 if (r < 0)
7b50eb2e 955 return NULL;
42cc2eeb 956 break;
42cc2eeb 957
ff3d6560 958 case DNS_TYPE_DNSKEY: {
8e54f5d9 959 _cleanup_free_ char *alg = NULL;
fc8eec10
ZJS		 960 uint16_t key_tag;
961
962 key_tag = dnssec_keytag(rr, true);
ff3d6560 963
8e54f5d9
LP		 964 r = dnssec_algorithm_to_string_alloc(rr->dnskey.algorithm, &alg);
965 if (r < 0)
966 return NULL;
ff3d6560 967
516a00e9 968 r = asprintf(&t, "%s %u %u %s",
8db0d2f5 969 k,
f91dc240
LP		 970 rr->dnskey.flags,
971 rr->dnskey.protocol,
4bb91a95 972 alg);
8db0d2f5 973 if (r < 0)
7b50eb2e 974 return NULL;
d7671a3e 975
516a00e9 976 r = base64_append(&t, r,
d7671a3e
ZJS		 977 rr->dnskey.key, rr->dnskey.key_size,
978 8, columns());
979 if (r < 0)
980 return NULL;
981
516a00e9 982 r = asprintf(&s, "%s\n"
718af59e
ZJS		 983 " -- Flags:%s%s%s\n"
984 " -- Key tag: %u",
516a00e9 985 t,
99e5ca6d
ZJS		 986 rr->dnskey.flags & DNSKEY_FLAG_SEP ? " SEP" : "",
987 rr->dnskey.flags & DNSKEY_FLAG_REVOKE ? " REVOKE" : "",
fc8eec10 988 rr->dnskey.flags & DNSKEY_FLAG_ZONE_KEY ? " ZONE_KEY" : "",
fc8eec10 989 key_tag);
99e5ca6d
ZJS		 990 if (r < 0)
991 return NULL;
99e5ca6d 992
8db0d2f5 993 break;
ff3d6560 994 }
2d4c5cbc 995
151226ab 996 case DNS_TYPE_RRSIG: {
8e54f5d9 997 _cleanup_free_ char *alg = NULL;
fbd0b64f 998 char expiration[STRLEN("YYYYMMDDHHmmSS") + 1], inception[STRLEN("YYYYMMDDHHmmSS") + 1];
8e54f5d9 999 const char *type;
151226ab
ZJS		 1000
1001 type = dns_type_to_string(rr->rrsig.type_covered);
8e54f5d9
LP		 1002
1003 r = dnssec_algorithm_to_string_alloc(rr->rrsig.algorithm, &alg);
1004 if (r < 0)
1005 return NULL;
151226ab 1006
7c6423e1
TG		 1007 r = format_timestamp_dns(expiration, sizeof(expiration), rr->rrsig.expiration);
1008 if (r < 0)
7b50eb2e 1009 return NULL;
7c6423e1
TG		 1010
1011 r = format_timestamp_dns(inception, sizeof(inception), rr->rrsig.inception);
1012 if (r < 0)
7b50eb2e 1013 return NULL;
7c6423e1 1014
151226ab
ZJS		 1015 /* TYPE?? follows
1016 * http://tools.ietf.org/html/rfc3597#section-5 */
1017
4bb91a95 1018 r = asprintf(&s, "%s %s%.*u %s %u %u %s %s %u %s",
151226ab
ZJS		 1019 k,
1020 type ?: "TYPE",
1021 type ? 0 : 1, type ? 0u : (unsigned) rr->rrsig.type_covered,
8e54f5d9 1022 alg,
151226ab
ZJS		 1023 rr->rrsig.labels,
1024 rr->rrsig.original_ttl,
7c6423e1
TG		 1025 expiration,
1026 inception,
151226ab 1027 rr->rrsig.key_tag,
4bb91a95 1028 rr->rrsig.signer);
151226ab 1029 if (r < 0)
7b50eb2e 1030 return NULL;
d7671a3e 1031
4bb91a95 1032 r = base64_append(&s, r,
d7671a3e
ZJS		 1033 rr->rrsig.signature, rr->rrsig.signature_size,
1034 8, columns());
1035 if (r < 0)
1036 return NULL;
1037
151226ab
ZJS		 1038 break;
1039 }
1040
50f1e641
TG		 1041 case DNS_TYPE_NSEC:
1042 t = format_types(rr->nsec.types);
1043 if (!t)
7b50eb2e 1044 return NULL;
50f1e641
TG		 1045
1046 r = asprintf(&s, "%s %s %s",
1047 k,
1048 rr->nsec.next_domain_name,
1049 t);
1050 if (r < 0)
7b50eb2e 1051 return NULL;
50f1e641
TG		 1052 break;
1053
5d45a880
TG		 1054 case DNS_TYPE_NSEC3: {
1055 _cleanup_free_ char *salt = NULL, *hash = NULL;
1056
f5430a3e 1057 if (rr->nsec3.salt_size > 0) {
5d45a880
TG		 1058 salt = hexmem(rr->nsec3.salt, rr->nsec3.salt_size);
1059 if (!salt)
7b50eb2e 1060 return NULL;
5d45a880
TG		 1061 }
1062
1063 hash = base32hexmem(rr->nsec3.next_hashed_name, rr->nsec3.next_hashed_name_size, false);
1064 if (!hash)
7b50eb2e 1065 return NULL;
5d45a880
TG		 1066
1067 t = format_types(rr->nsec3.types);
1068 if (!t)
7b50eb2e 1069 return NULL;
5d45a880
TG		 1070
1071 r = asprintf(&s, "%s %"PRIu8" %"PRIu8" %"PRIu16" %s %s %s",
1072 k,
1073 rr->nsec3.algorithm,
1074 rr->nsec3.flags,
1075 rr->nsec3.iterations,
f5430a3e 1076 rr->nsec3.salt_size > 0 ? salt : "-",
5d45a880
TG		 1077 hash,
1078 t);
1079 if (r < 0)
7b50eb2e 1080 return NULL;
5d45a880
TG		 1081
1082 break;
1083 }
1084
411d095d
LP		 1085 case DNS_TYPE_TLSA:
1086 t = hexmem(rr->tlsa.data, rr->tlsa.data_size);
236d312b 1087 if (!t)
48d45d2b 1088 return NULL;
cfb90da3 1089
236d312b
ZJS		 1090 r = asprintf(&s,
1091 "%s %u %u %u %s\n"
718af59e
ZJS		 1092 " -- Cert. usage: %s\n"
1093 " -- Selector: %s\n"
1094 " -- Matching type: %s",
236d312b
ZJS		 1095 k,
1096 rr->tlsa.cert_usage,
1097 rr->tlsa.selector,
1098 rr->tlsa.matching_type,
1099 t,
411d095d
LP		 1100 tlsa_cert_usage_to_string(rr->tlsa.cert_usage),
1101 tlsa_selector_to_string(rr->tlsa.selector),
1102 tlsa_matching_type_to_string(rr->tlsa.matching_type));
cfb90da3
ZJS		 1103 if (r < 0)
1104 return NULL;
cfb90da3 1105
48d45d2b 1106 break;
48d45d2b 1107
037e5b15
DT		 1108 case DNS_TYPE_CAA:
1109 t = octescape(rr->caa.value, rr->caa.value_size);
1110 if (!t)
95052df3
ZJS		 1111 return NULL;
1112
718af59e 1113 r = asprintf(&s, "%s %u %s \"%s\"%s%s%s%.0u",
95052df3
ZJS		 1114 k,
1115 rr->caa.flags,
1116 rr->caa.tag,
037e5b15 1117 t,
718af59e
ZJS		 1118 rr->caa.flags ? "\n -- Flags:" : "",
1119 rr->caa.flags & CAA_FLAG_CRITICAL ? " critical" : "",
1120 rr->caa.flags & ~CAA_FLAG_CRITICAL ? " " : "",
1121 rr->caa.flags & ~CAA_FLAG_CRITICAL);
95052df3
ZJS		 1122 if (r < 0)
1123 return NULL;
1124
1125 break;
95052df3 1126
eba1eb90 1127 case DNS_TYPE_OPENPGPKEY:
4bb91a95 1128 r = asprintf(&s, "%s", k);
d93a16b8
ZJS		 1129 if (r < 0)
1130 return NULL;
1131
4bb91a95 1132 r = base64_append(&s, r,
a43a068a 1133 rr->generic.data, rr->generic.data_size,
d93a16b8
ZJS		 1134 8, columns());
1135 if (r < 0)
1136 return NULL;
1137 break;
d93a16b8 1138
8db0d2f5 1139 default:
6af47493 1140 /* Format as documented in RFC 3597, Section 5 */
84f788d6
EV		 1141 if (rr->generic.data_size == 0)
1142 r = asprintf(&s, "%s \\# 0", k);
1143 else {
1144 t = hexmem(rr->generic.data, rr->generic.data_size);
1145 if (!t)
1146 return NULL;
1147 r = asprintf(&s, "%s \\# %zu %s", k, rr->generic.data_size, t);
1148 }
d23a27a9 1149 if (r < 0)
7b50eb2e 1150 return NULL;
2d4c5cbc 1151 break;
8db0d2f5 1152 }
2d4c5cbc 1153
7b50eb2e 1154 rr->to_string = s;
bc833401 1155 return TAKE_PTR(s);
2d4c5cbc 1156}
322345fd 1157
2e74028a
ZJS		 1158ssize_t dns_resource_record_payload(DnsResourceRecord *rr, void **out) {
1159 assert(rr);
1160 assert(out);
1161
79893116 1162 switch (rr->unparsable ? _DNS_TYPE_INVALID : rr->key->type) {
2e74028a
ZJS		 1163 case DNS_TYPE_SRV:
1164 case DNS_TYPE_PTR:
1165 case DNS_TYPE_NS:
1166 case DNS_TYPE_CNAME:
1167 case DNS_TYPE_DNAME:
1168 case DNS_TYPE_HINFO:
1169 case DNS_TYPE_SPF:
1170 case DNS_TYPE_TXT:
1171 case DNS_TYPE_A:
1172 case DNS_TYPE_AAAA:
1173 case DNS_TYPE_SOA:
1174 case DNS_TYPE_MX:
1175 case DNS_TYPE_LOC:
1176 case DNS_TYPE_DS:
2e74028a
ZJS		 1177 case DNS_TYPE_DNSKEY:
1178 case DNS_TYPE_RRSIG:
1179 case DNS_TYPE_NSEC:
1180 case DNS_TYPE_NSEC3:
1181 return -EINVAL;
1182
e1caa6e0
ZJS		 1183 case DNS_TYPE_SSHFP:
1184 *out = rr->sshfp.fingerprint;
1185 return rr->sshfp.fingerprint_size;
1186
2e74028a
ZJS		 1187 case DNS_TYPE_TLSA:
1188 *out = rr->tlsa.data;
1189 return rr->tlsa.data_size;
1190
2e74028a
ZJS		 1191 case DNS_TYPE_OPENPGPKEY:
1192 default:
1193 *out = rr->generic.data;
1194 return rr->generic.data_size;
1195 }
1196}
1197
a8812dd7
LP		 1198int dns_resource_record_to_wire_format(DnsResourceRecord *rr, bool canonical) {
1199
1200 DnsPacket packet = {
1201 .n_ref = 1,
1202 .protocol = DNS_PROTOCOL_DNS,
1203 .on_stack = true,
1204 .refuse_compression = true,
1205 .canonical_form = canonical,
1206 };
1207
1208 size_t start, rds;
1209 int r;
1210
1211 assert(rr);
1212
1213 /* Generates the RR in wire-format, optionally in the
1214 * canonical form as discussed in the DNSSEC RFC 4034, Section
1215 * 6.2. We allocate a throw-away DnsPacket object on the stack
1216 * here, because we need some book-keeping for memory
1217 * management, and can reuse the DnsPacket serializer, that
1218 * can generate the canonical form, too, but also knows label
1219 * compression and suchlike. */
1220
1221 if (rr->wire_format && rr->wire_format_canonical == canonical)
1222 return 0;
1223
58ab31d5 1224 r = dns_packet_append_rr(&packet, rr, 0, &start, &rds);
a8812dd7
LP		 1225 if (r < 0)
1226 return r;
1227
1228 assert(start == 0);
1229 assert(packet._data);
1230
1231 free(rr->wire_format);
1232 rr->wire_format = packet._data;
1233 rr->wire_format_size = packet.size;
1234 rr->wire_format_rdata_offset = rds;
1235 rr->wire_format_canonical = canonical;
1236
1237 packet._data = NULL;
1238 dns_packet_unref(&packet);
1239
1240 return 0;
1241}
1242
97c67192
LP		 1243int dns_resource_record_signer(DnsResourceRecord *rr, const char **ret) {
1244 const char *n;
1245 int r;
1246
1247 assert(rr);
1248 assert(ret);
1249
1250 /* Returns the RRset's signer, if it is known. */
1251
98e80bf9 1252 if (rr->n_skip_labels_signer == UINT8_MAX)
97c67192
LP		 1253 return -ENODATA;
1254
1c02e7ba 1255 n = dns_resource_key_name(rr->key);
97c67192
LP		 1256 r = dns_name_skip(n, rr->n_skip_labels_signer, &n);
1257 if (r < 0)
1258 return r;
1259 if (r == 0)
1260 return -EINVAL;
1261
1262 *ret = n;
1263 return 0;
1264}
1265
1266int dns_resource_record_source(DnsResourceRecord *rr, const char **ret) {
1267 const char *n;
1268 int r;
1269
1270 assert(rr);
1271 assert(ret);
1272
1273 /* Returns the RRset's synthesizing source, if it is known. */
1274
98e80bf9 1275 if (rr->n_skip_labels_source == UINT8_MAX)
97c67192
LP		 1276 return -ENODATA;
1277
1c02e7ba 1278 n = dns_resource_key_name(rr->key);
97c67192
LP		 1279 r = dns_name_skip(n, rr->n_skip_labels_source, &n);
1280 if (r < 0)
1281 return r;
1282 if (r == 0)
1283 return -EINVAL;
1284
1285 *ret = n;
1286 return 0;
1287}
1288
1289int dns_resource_record_is_signer(DnsResourceRecord *rr, const char *zone) {
1290 const char *signer;
1291 int r;
1292
ab481675
LP		 1293 assert(rr);
1294
97c67192
LP		 1295 r = dns_resource_record_signer(rr, &signer);
1296 if (r < 0)
1297 return r;
1298
1299 return dns_name_equal(zone, signer);
1300}
1301
ab481675
LP		 1302int dns_resource_record_is_synthetic(DnsResourceRecord *rr) {
1303 int r;
1304
1305 assert(rr);
1306
1307 /* Returns > 0 if the RR is generated from a wildcard, and is not the asterisk name itself */
1308
98e80bf9 1309 if (rr->n_skip_labels_source == UINT8_MAX)
ab481675
LP		 1310 return -ENODATA;
1311
1312 if (rr->n_skip_labels_source == 0)
1313 return 0;
1314
1315 if (rr->n_skip_labels_source > 1)
1316 return 1;
1317
1c02e7ba 1318 r = dns_name_startswith(dns_resource_key_name(rr->key), "*");
ab481675
LP		 1319 if (r < 0)
1320 return r;
1321
1322 return !r;
1323}
1324
7a08d314 1325void dns_resource_record_hash_func(const DnsResourceRecord *rr, struct siphash *state) {
c9c72065
LP		 1326 assert(rr);
1327
1328 dns_resource_key_hash_func(rr->key, state);
1329
52e085af 1330 switch (rr->unparsable ? _DNS_TYPE_INVALID : rr->key->type) {
c9c72065
LP		 1331
1332 case DNS_TYPE_SRV:
1333 siphash24_compress(&rr->srv.priority, sizeof(rr->srv.priority), state);
1334 siphash24_compress(&rr->srv.weight, sizeof(rr->srv.weight), state);
1335 siphash24_compress(&rr->srv.port, sizeof(rr->srv.port), state);
1336 dns_name_hash_func(rr->srv.name, state);
1337 break;
1338
1339 case DNS_TYPE_PTR:
1340 case DNS_TYPE_NS:
1341 case DNS_TYPE_CNAME:
1342 case DNS_TYPE_DNAME:
1343 dns_name_hash_func(rr->ptr.name, state);
1344 break;
1345
1346 case DNS_TYPE_HINFO:
1347 string_hash_func(rr->hinfo.cpu, state);
1348 string_hash_func(rr->hinfo.os, state);
1349 break;
1350
1351 case DNS_TYPE_TXT:
1352 case DNS_TYPE_SPF: {
c9c72065 1353 LIST_FOREACH(items, j, rr->txt.items) {
b652ccca 1354 siphash24_compress_safe(j->data, j->length, state);
c9c72065 1355
d5115566
LP		 1356 /* Add an extra NUL byte, so that "a" followed by "b" doesn't result in the same hash as "ab"
1357 * followed by "". */
1358 siphash24_compress_byte(0, state);
c9c72065
LP		 1359 }
1360 break;
1361 }
1362
1363 case DNS_TYPE_A:
1364 siphash24_compress(&rr->a.in_addr, sizeof(rr->a.in_addr), state);
1365 break;
1366
1367 case DNS_TYPE_AAAA:
1368 siphash24_compress(&rr->aaaa.in6_addr, sizeof(rr->aaaa.in6_addr), state);
1369 break;
1370
1371 case DNS_TYPE_SOA:
1372 dns_name_hash_func(rr->soa.mname, state);
1373 dns_name_hash_func(rr->soa.rname, state);
1374 siphash24_compress(&rr->soa.serial, sizeof(rr->soa.serial), state);
1375 siphash24_compress(&rr->soa.refresh, sizeof(rr->soa.refresh), state);
1376 siphash24_compress(&rr->soa.retry, sizeof(rr->soa.retry), state);
1377 siphash24_compress(&rr->soa.expire, sizeof(rr->soa.expire), state);
1378 siphash24_compress(&rr->soa.minimum, sizeof(rr->soa.minimum), state);
1379 break;
1380
1381 case DNS_TYPE_MX:
1382 siphash24_compress(&rr->mx.priority, sizeof(rr->mx.priority), state);
1383 dns_name_hash_func(rr->mx.exchange, state);
1384 break;
1385
1386 case DNS_TYPE_LOC:
1387 siphash24_compress(&rr->loc.version, sizeof(rr->loc.version), state);
1388 siphash24_compress(&rr->loc.size, sizeof(rr->loc.size), state);
1389 siphash24_compress(&rr->loc.horiz_pre, sizeof(rr->loc.horiz_pre), state);
1390 siphash24_compress(&rr->loc.vert_pre, sizeof(rr->loc.vert_pre), state);
1391 siphash24_compress(&rr->loc.latitude, sizeof(rr->loc.latitude), state);
1392 siphash24_compress(&rr->loc.longitude, sizeof(rr->loc.longitude), state);
1393 siphash24_compress(&rr->loc.altitude, sizeof(rr->loc.altitude), state);
1394 break;
1395
1396 case DNS_TYPE_SSHFP:
1397 siphash24_compress(&rr->sshfp.algorithm, sizeof(rr->sshfp.algorithm), state);
1398 siphash24_compress(&rr->sshfp.fptype, sizeof(rr->sshfp.fptype), state);
b652ccca 1399 siphash24_compress_safe(rr->sshfp.fingerprint, rr->sshfp.fingerprint_size, state);
c9c72065
LP		 1400 break;
1401
1402 case DNS_TYPE_DNSKEY:
1403 siphash24_compress(&rr->dnskey.flags, sizeof(rr->dnskey.flags), state);
1404 siphash24_compress(&rr->dnskey.protocol, sizeof(rr->dnskey.protocol), state);
1405 siphash24_compress(&rr->dnskey.algorithm, sizeof(rr->dnskey.algorithm), state);
b652ccca 1406 siphash24_compress_safe(rr->dnskey.key, rr->dnskey.key_size, state);
c9c72065
LP		 1407 break;
1408
1409 case DNS_TYPE_RRSIG:
1410 siphash24_compress(&rr->rrsig.type_covered, sizeof(rr->rrsig.type_covered), state);
1411 siphash24_compress(&rr->rrsig.algorithm, sizeof(rr->rrsig.algorithm), state);
1412 siphash24_compress(&rr->rrsig.labels, sizeof(rr->rrsig.labels), state);
1413 siphash24_compress(&rr->rrsig.original_ttl, sizeof(rr->rrsig.original_ttl), state);
1414 siphash24_compress(&rr->rrsig.expiration, sizeof(rr->rrsig.expiration), state);
1415 siphash24_compress(&rr->rrsig.inception, sizeof(rr->rrsig.inception), state);
1416 siphash24_compress(&rr->rrsig.key_tag, sizeof(rr->rrsig.key_tag), state);
1417 dns_name_hash_func(rr->rrsig.signer, state);
b652ccca 1418 siphash24_compress_safe(rr->rrsig.signature, rr->rrsig.signature_size, state);
c9c72065
LP		 1419 break;
1420
1421 case DNS_TYPE_NSEC:
1422 dns_name_hash_func(rr->nsec.next_domain_name, state);
1423 /* FIXME: we leave out the type bitmap here. Hash
1424 * would be better if we'd take it into account
1425 * too. */
1426 break;
1427
1428 case DNS_TYPE_DS:
1429 siphash24_compress(&rr->ds.key_tag, sizeof(rr->ds.key_tag), state);
1430 siphash24_compress(&rr->ds.algorithm, sizeof(rr->ds.algorithm), state);
1431 siphash24_compress(&rr->ds.digest_type, sizeof(rr->ds.digest_type), state);
b652ccca 1432 siphash24_compress_safe(rr->ds.digest, rr->ds.digest_size, state);
c9c72065
LP		 1433 break;
1434
1435 case DNS_TYPE_NSEC3:
1436 siphash24_compress(&rr->nsec3.algorithm, sizeof(rr->nsec3.algorithm), state);
1437 siphash24_compress(&rr->nsec3.flags, sizeof(rr->nsec3.flags), state);
1438 siphash24_compress(&rr->nsec3.iterations, sizeof(rr->nsec3.iterations), state);
b652ccca
YW		 1439 siphash24_compress_safe(rr->nsec3.salt, rr->nsec3.salt_size, state);
1440 siphash24_compress_safe(rr->nsec3.next_hashed_name, rr->nsec3.next_hashed_name_size, state);
c9c72065
LP		 1441 /* FIXME: We leave the bitmaps out */
1442 break;
48d45d2b
ZJS		 1443
1444 case DNS_TYPE_TLSA:
1445 siphash24_compress(&rr->tlsa.cert_usage, sizeof(rr->tlsa.cert_usage), state);
1446 siphash24_compress(&rr->tlsa.selector, sizeof(rr->tlsa.selector), state);
1447 siphash24_compress(&rr->tlsa.matching_type, sizeof(rr->tlsa.matching_type), state);
b652ccca 1448 siphash24_compress_safe(rr->tlsa.data, rr->tlsa.data_size, state);
48d45d2b 1449 break;
c9c72065 1450
95052df3
ZJS		 1451 case DNS_TYPE_CAA:
1452 siphash24_compress(&rr->caa.flags, sizeof(rr->caa.flags), state);
1453 string_hash_func(rr->caa.tag, state);
b652ccca 1454 siphash24_compress_safe(rr->caa.value, rr->caa.value_size, state);
48d45d2b 1455 break;
c9c72065 1456
d93a16b8 1457 case DNS_TYPE_OPENPGPKEY:
c9c72065 1458 default:
b652ccca 1459 siphash24_compress_safe(rr->generic.data, rr->generic.data_size, state);
c9c72065
LP		 1460 break;
1461 }
1462}
1463
ae45e1a3 1464int dns_resource_record_compare_func(const DnsResourceRecord *x, const DnsResourceRecord *y) {
7a08d314 1465 int r;
c9c72065 1466
7a08d314
YW		 1467 r = dns_resource_key_compare_func(x->key, y->key);
1468 if (r != 0)
1469 return r;
c9c72065 1470
cd70fc37 1471 if (dns_resource_record_payload_equal(x, y) > 0)
c9c72065
LP		 1472 return 0;
1473
53c5797f
FB		 1474 /* We still use CMP() here, even though don't implement proper
1475 * ordering, since the hashtable doesn't need ordering anyway. */
1476 return CMP(x, y);
c9c72065
LP		 1477}
1478
7a08d314 1479DEFINE_HASH_OPS(dns_resource_record_hash_ops, DnsResourceRecord, dns_resource_record_hash_func, dns_resource_record_compare_func);
c9c72065 1480
17c8de63
LP		 1481DnsResourceRecord *dns_resource_record_copy(DnsResourceRecord *rr) {
1482 _cleanup_(dns_resource_record_unrefp) DnsResourceRecord *copy = NULL;
1483 DnsResourceRecord *t;
1484
1485 assert(rr);
1486
1487 copy = dns_resource_record_new(rr->key);
1488 if (!copy)
1489 return NULL;
1490
1491 copy->ttl = rr->ttl;
1492 copy->expiry = rr->expiry;
1493 copy->n_skip_labels_signer = rr->n_skip_labels_signer;
1494 copy->n_skip_labels_source = rr->n_skip_labels_source;
52e085af 1495 copy->unparsable = rr->unparsable;
17c8de63 1496
52e085af 1497 switch (rr->unparsable ? _DNS_TYPE_INVALID : rr->key->type) {
17c8de63
LP		 1498
1499 case DNS_TYPE_SRV:
1500 copy->srv.priority = rr->srv.priority;
1501 copy->srv.weight = rr->srv.weight;
1502 copy->srv.port = rr->srv.port;
1503 copy->srv.name = strdup(rr->srv.name);
1504 if (!copy->srv.name)
1505 return NULL;
1506 break;
1507
1508 case DNS_TYPE_PTR:
1509 case DNS_TYPE_NS:
1510 case DNS_TYPE_CNAME:
1511 case DNS_TYPE_DNAME:
1512 copy->ptr.name = strdup(rr->ptr.name);
1513 if (!copy->ptr.name)
1514 return NULL;
1515 break;
1516
1517 case DNS_TYPE_HINFO:
1518 copy->hinfo.cpu = strdup(rr->hinfo.cpu);
1519 if (!copy->hinfo.cpu)
1520 return NULL;
1521
1522 copy->hinfo.os = strdup(rr->hinfo.os);
508f63b4 1523 if (!copy->hinfo.os)
17c8de63
LP		 1524 return NULL;
1525 break;
1526
1527 case DNS_TYPE_TXT:
1528 case DNS_TYPE_SPF:
1529 copy->txt.items = dns_txt_item_copy(rr->txt.items);
1530 if (!copy->txt.items)
1531 return NULL;
1532 break;
1533
1534 case DNS_TYPE_A:
1535 copy->a = rr->a;
1536 break;
1537
1538 case DNS_TYPE_AAAA:
1539 copy->aaaa = rr->aaaa;
1540 break;
1541
1542 case DNS_TYPE_SOA:
1543 copy->soa.mname = strdup(rr->soa.mname);
1544 if (!copy->soa.mname)
1545 return NULL;
1546 copy->soa.rname = strdup(rr->soa.rname);
1547 if (!copy->soa.rname)
1548 return NULL;
1549 copy->soa.serial = rr->soa.serial;
1550 copy->soa.refresh = rr->soa.refresh;
1551 copy->soa.retry = rr->soa.retry;
1552 copy->soa.expire = rr->soa.expire;
1553 copy->soa.minimum = rr->soa.minimum;
1554 break;
1555
1556 case DNS_TYPE_MX:
1557 copy->mx.priority = rr->mx.priority;
1558 copy->mx.exchange = strdup(rr->mx.exchange);
1559 if (!copy->mx.exchange)
1560 return NULL;
1561 break;
1562
1563 case DNS_TYPE_LOC:
1564 copy->loc = rr->loc;
1565 break;
1566
1567 case DNS_TYPE_SSHFP:
1568 copy->sshfp.algorithm = rr->sshfp.algorithm;
1569 copy->sshfp.fptype = rr->sshfp.fptype;
1570 copy->sshfp.fingerprint = memdup(rr->sshfp.fingerprint, rr->sshfp.fingerprint_size);
1571 if (!copy->sshfp.fingerprint)
1572 return NULL;
1573 copy->sshfp.fingerprint_size = rr->sshfp.fingerprint_size;
1574 break;
1575
1576 case DNS_TYPE_DNSKEY:
1577 copy->dnskey.flags = rr->dnskey.flags;
1578 copy->dnskey.protocol = rr->dnskey.protocol;
1579 copy->dnskey.algorithm = rr->dnskey.algorithm;
1580 copy->dnskey.key = memdup(rr->dnskey.key, rr->dnskey.key_size);
1581 if (!copy->dnskey.key)
1582 return NULL;
1583 copy->dnskey.key_size = rr->dnskey.key_size;
1584 break;
1585
1586 case DNS_TYPE_RRSIG:
1587 copy->rrsig.type_covered = rr->rrsig.type_covered;
1588 copy->rrsig.algorithm = rr->rrsig.algorithm;
1589 copy->rrsig.labels = rr->rrsig.labels;
1590 copy->rrsig.original_ttl = rr->rrsig.original_ttl;
1591 copy->rrsig.expiration = rr->rrsig.expiration;
1592 copy->rrsig.inception = rr->rrsig.inception;
1593 copy->rrsig.key_tag = rr->rrsig.key_tag;
1594 copy->rrsig.signer = strdup(rr->rrsig.signer);
1595 if (!copy->rrsig.signer)
1596 return NULL;
1597 copy->rrsig.signature = memdup(rr->rrsig.signature, rr->rrsig.signature_size);
1598 if (!copy->rrsig.signature)
1599 return NULL;
1600 copy->rrsig.signature_size = rr->rrsig.signature_size;
1601 break;
1602
1603 case DNS_TYPE_NSEC:
1604 copy->nsec.next_domain_name = strdup(rr->nsec.next_domain_name);
1605 if (!copy->nsec.next_domain_name)
1606 return NULL;
1f00a50c
AT		 1607 if (rr->nsec.types) {
1608 copy->nsec.types = bitmap_copy(rr->nsec.types);
1609 if (!copy->nsec.types)
1610 return NULL;
1611 }
17c8de63
LP		 1612 break;
1613
1614 case DNS_TYPE_DS:
1615 copy->ds.key_tag = rr->ds.key_tag;
1616 copy->ds.algorithm = rr->ds.algorithm;
1617 copy->ds.digest_type = rr->ds.digest_type;
1618 copy->ds.digest = memdup(rr->ds.digest, rr->ds.digest_size);
1619 if (!copy->ds.digest)
1620 return NULL;
1621 copy->ds.digest_size = rr->ds.digest_size;
1622 break;
1623
1624 case DNS_TYPE_NSEC3:
1625 copy->nsec3.algorithm = rr->nsec3.algorithm;
1626 copy->nsec3.flags = rr->nsec3.flags;
1627 copy->nsec3.iterations = rr->nsec3.iterations;
1628 copy->nsec3.salt = memdup(rr->nsec3.salt, rr->nsec3.salt_size);
1629 if (!copy->nsec3.salt)
1630 return NULL;
1631 copy->nsec3.salt_size = rr->nsec3.salt_size;
1632 copy->nsec3.next_hashed_name = memdup(rr->nsec3.next_hashed_name, rr->nsec3.next_hashed_name_size);
a63a1252 1633 if (!copy->nsec3.next_hashed_name)
17c8de63
LP		 1634 return NULL;
1635 copy->nsec3.next_hashed_name_size = rr->nsec3.next_hashed_name_size;
1f00a50c
AT		 1636 if (rr->nsec3.types) {
1637 copy->nsec3.types = bitmap_copy(rr->nsec3.types);
1638 if (!copy->nsec3.types)
1639 return NULL;
1640 }
17c8de63
LP		 1641 break;
1642
1643 case DNS_TYPE_TLSA:
1644 copy->tlsa.cert_usage = rr->tlsa.cert_usage;
1645 copy->tlsa.selector = rr->tlsa.selector;
1646 copy->tlsa.matching_type = rr->tlsa.matching_type;
1647 copy->tlsa.data = memdup(rr->tlsa.data, rr->tlsa.data_size);
1648 if (!copy->tlsa.data)
1649 return NULL;
1650 copy->tlsa.data_size = rr->tlsa.data_size;
1651 break;
1652
1653 case DNS_TYPE_CAA:
1654 copy->caa.flags = rr->caa.flags;
1655 copy->caa.tag = strdup(rr->caa.tag);
1656 if (!copy->caa.tag)
1657 return NULL;
1658 copy->caa.value = memdup(rr->caa.value, rr->caa.value_size);
1659 if (!copy->caa.value)
1660 return NULL;
1661 copy->caa.value_size = rr->caa.value_size;
1662 break;
1663
1664 case DNS_TYPE_OPT:
1665 default:
1666 copy->generic.data = memdup(rr->generic.data, rr->generic.data_size);
1667 if (!copy->generic.data)
1668 return NULL;
1669 copy->generic.data_size = rr->generic.data_size;
1670 break;
1671 }
1672
1cc6c93a 1673 t = TAKE_PTR(copy);
17c8de63
LP		 1674
1675 return t;
1676}
1677
1678int dns_resource_record_clamp_ttl(DnsResourceRecord **rr, uint32_t max_ttl) {
1679 DnsResourceRecord *old_rr, *new_rr;
1680 uint32_t new_ttl;
1681
1682 assert(rr);
1683 old_rr = *rr;
1684
1685 if (old_rr->key->type == DNS_TYPE_OPT)
1686 return -EINVAL;
1687
1688 new_ttl = MIN(old_rr->ttl, max_ttl);
1689 if (new_ttl == old_rr->ttl)
1690 return 0;
1691
1692 if (old_rr->n_ref == 1) {
1693 /* Patch in place */
1694 old_rr->ttl = new_ttl;
1695 return 1;
1696 }
1697
1698 new_rr = dns_resource_record_copy(old_rr);
1699 if (!new_rr)
1700 return -ENOMEM;
1701
1702 new_rr->ttl = new_ttl;
1703
7daeec3e 1704 DNS_RR_REPLACE(*rr, new_rr);
17c8de63
LP		 1705 return 1;
1706}
1707
48662847 1708bool dns_resource_record_is_link_local_address(DnsResourceRecord *rr) {
d1f8fbea 1709 assert(rr);
48662847
LP		 1710
1711 if (rr->key->class != DNS_CLASS_IN)
1712 return false;
1713
1714 if (rr->key->type == DNS_TYPE_A)
1715 return in4_addr_is_link_local(&rr->a.in_addr);
1716
1717 if (rr->key->type == DNS_TYPE_AAAA)
94876904 1718 return in6_addr_is_link_local(&rr->aaaa.in6_addr);
48662847
LP		 1719
1720 return false;
1721}
1722
d1f8fbea
LP		 1723int dns_resource_record_get_cname_target(DnsResourceKey *key, DnsResourceRecord *cname, char **ret) {
1724 _cleanup_free_ char *d = NULL;
1725 int r;
1726
1727 assert(key);
1728 assert(cname);
1729
d2995826
LP		 1730 /* Checks if the RR `cname` is a CNAME/DNAME RR that matches the specified `key`. If so, returns the
1731 * target domain. If not, returns -EUNATCH */
1732
d1f8fbea
LP		 1733 if (key->class != cname->key->class && key->class != DNS_CLASS_ANY)
1734 return -EUNATCH;
1735
d2995826
LP		 1736 if (!dns_type_may_redirect(key->type)) /* This key type is not subject to CNAME/DNAME redirection?
1737 * Then let's refuse right-away */
1738 return -EUNATCH;
1739
d1f8fbea
LP		 1740 if (cname->key->type == DNS_TYPE_CNAME) {
1741 r = dns_name_equal(dns_resource_key_name(key),
1742 dns_resource_key_name(cname->key));
1743 if (r < 0)
1744 return r;
1745 if (r == 0)
1746 return -EUNATCH; /* CNAME RR key doesn't actually match the original key */
1747
1748 d = strdup(cname->cname.name);
1749 if (!d)
1750 return -ENOMEM;
1751
1752 } else if (cname->key->type == DNS_TYPE_DNAME) {
1753
1754 r = dns_name_change_suffix(
1755 dns_resource_key_name(key),
1756 dns_resource_key_name(cname->key),
1757 cname->dname.name,
1758 &d);
1759 if (r < 0)
1760 return r;
1761 if (r == 0)
1762 return -EUNATCH; /* DNAME RR key doesn't actually match the original key */
1763
1764 } else
1765 return -EUNATCH; /* Not a CNAME/DNAME RR, hence doesn't match the proposition either */
1766
1767 *ret = TAKE_PTR(d);
1768 return 0;
1769}
1770
2001c805
LP		 1771DnsTxtItem *dns_txt_item_free_all(DnsTxtItem *i) {
1772 DnsTxtItem *n;
1773
1774 if (!i)
1775 return NULL;
1776
1777 n = i->items_next;
1778
1779 free(i);
1780 return dns_txt_item_free_all(n);
1781}
1782
1783bool dns_txt_item_equal(DnsTxtItem *a, DnsTxtItem *b) {
1784
4d247a6c
LP		 1785 if (a == b)
1786 return true;
1787
2001c805
LP		 1788 if (!a != !b)
1789 return false;
1790
1791 if (!a)
1792 return true;
1793
1794 if (a->length != b->length)
1795 return false;
1796
1797 if (memcmp(a->data, b->data, a->length) != 0)
1798 return false;
1799
1800 return dns_txt_item_equal(a->items_next, b->items_next);
1801}
8730bccf 1802
17c8de63 1803DnsTxtItem *dns_txt_item_copy(DnsTxtItem *first) {
03677889 1804 DnsTxtItem *copy = NULL, *end = NULL;
17c8de63
LP		 1805
1806 LIST_FOREACH(items, i, first) {
1807 DnsTxtItem *j;
1808
1809 j = memdup(i, offsetof(DnsTxtItem, data) + i->length + 1);
1810 if (!j) {
1811 dns_txt_item_free_all(copy);
1812 return NULL;
1813 }
1814
1815 LIST_INSERT_AFTER(items, copy, end, j);
1816 end = j;
1817 }
1818
1819 return copy;
1820}
1821
ebb779dc
DR		 1822int dns_txt_item_new_empty(DnsTxtItem **ret) {
1823 DnsTxtItem *i;
1824
1825 /* RFC 6763, section 6.1 suggests to treat
1826 * empty TXT RRs as equivalent to a TXT record
1827 * with a single empty string. */
1828
1829 i = malloc0(offsetof(DnsTxtItem, data) + 1); /* for safety reasons we add an extra NUL byte */
1830 if (!i)
1831 return -ENOMEM;
1832
1833 *ret = i;
1834
1835 return 0;
1836}
1837
ab26cdf7
LP		 1838int dns_resource_record_new_from_raw(DnsResourceRecord **ret, const void *data, size_t size) {
1839 _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL;
1840 int r;
1841
1842 r = dns_packet_new(&p, DNS_PROTOCOL_DNS, 0, DNS_PACKET_SIZE_MAX);
1843 if (r < 0)
1844 return r;
1845
1846 p->refuse_compression = true;
1847
1848 r = dns_packet_append_blob(p, data, size, NULL);
1849 if (r < 0)
1850 return r;
1851
1852 return dns_packet_read_rr(p, ret, NULL, NULL);
1853}
1854
1482c86a
LP		 1855int dns_resource_key_to_json(DnsResourceKey *key, JsonVariant **ret) {
1856 assert(key);
1857 assert(ret);
1858
1859 return json_build(ret,
1860 JSON_BUILD_OBJECT(
1861 JSON_BUILD_PAIR("class", JSON_BUILD_INTEGER(key->class)),
1862 JSON_BUILD_PAIR("type", JSON_BUILD_INTEGER(key->type)),
1863 JSON_BUILD_PAIR("name", JSON_BUILD_STRING(dns_resource_key_name(key)))));
1864}
1865
1866static int type_bitmap_to_json(Bitmap *b, JsonVariant **ret) {
1867 _cleanup_(json_variant_unrefp) JsonVariant *l = NULL;
1868 unsigned t;
1869 int r;
1870
1482c86a
LP		 1871 assert(ret);
1872
1873 BITMAP_FOREACH(t, b) {
1874 _cleanup_(json_variant_unrefp) JsonVariant *v = NULL;
1875
1876 r = json_variant_new_unsigned(&v, t);
1877 if (r < 0)
1878 return r;
1879
1880 r = json_variant_append_array(&l, v);
1881 if (r < 0)
1882 return r;
1883 }
1884
1885 if (!l)
1886 return json_variant_new_array(ret, NULL, 0);
1887
1888 *ret = TAKE_PTR(l);
1889 return 0;
1890}
1891
1892int dns_resource_record_to_json(DnsResourceRecord *rr, JsonVariant **ret) {
1893 _cleanup_(json_variant_unrefp) JsonVariant *k = NULL;
1894 int r;
1895
1896 assert(rr);
1897 assert(ret);
1898
1899 r = dns_resource_key_to_json(rr->key, &k);
1900 if (r < 0)
1901 return r;
1902
1903 switch (rr->unparsable ? _DNS_TYPE_INVALID : rr->key->type) {
1904
1905 case DNS_TYPE_SRV:
1906 return json_build(ret,
1907 JSON_BUILD_OBJECT(
1908 JSON_BUILD_PAIR("key", JSON_BUILD_VARIANT(k)),
1909 JSON_BUILD_PAIR("priority", JSON_BUILD_UNSIGNED(rr->srv.priority)),
1910 JSON_BUILD_PAIR("weight", JSON_BUILD_UNSIGNED(rr->srv.weight)),
1911 JSON_BUILD_PAIR("port", JSON_BUILD_UNSIGNED(rr->srv.port)),
1912 JSON_BUILD_PAIR("name", JSON_BUILD_STRING(rr->srv.name))));
1913
1914 case DNS_TYPE_PTR:
1915 case DNS_TYPE_NS:
1916 case DNS_TYPE_CNAME:
1917 case DNS_TYPE_DNAME:
1918 return json_build(ret,
1919 JSON_BUILD_OBJECT(
1920 JSON_BUILD_PAIR("key", JSON_BUILD_VARIANT(k)),
1921 JSON_BUILD_PAIR("name", JSON_BUILD_STRING(rr->ptr.name))));
1922
1923 case DNS_TYPE_HINFO:
1924 return json_build(ret,
1925 JSON_BUILD_OBJECT(
1926 JSON_BUILD_PAIR("key", JSON_BUILD_VARIANT(k)),
1927 JSON_BUILD_PAIR("cpu", JSON_BUILD_STRING(rr->hinfo.cpu)),
1928 JSON_BUILD_PAIR("os", JSON_BUILD_STRING(rr->hinfo.os))));
1929
1930 case DNS_TYPE_SPF:
1931 case DNS_TYPE_TXT: {
1932 _cleanup_(json_variant_unrefp) JsonVariant *l = NULL;
1933
1934 LIST_FOREACH(items, i, rr->txt.items) {
1935 _cleanup_(json_variant_unrefp) JsonVariant *b = NULL;
1936
1937 r = json_variant_new_octescape(&b, i->data, i->length);
1938 if (r < 0)
1939 return r;
1940
1941 r = json_variant_append_array(&l, b);
1942 if (r < 0)
1943 return r;
1944 }
1945
1946 if (!l) {
1947 r = json_variant_new_array(&l, NULL, 0);
1948 if (r < 0)
1949 return r;
1950 }
1951
1952 return json_build(ret,
1953 JSON_BUILD_OBJECT(
1954 JSON_BUILD_PAIR("key", JSON_BUILD_VARIANT(k)),
1955 JSON_BUILD_PAIR("items", JSON_BUILD_VARIANT(l))));
1956 }
1957
1958 case DNS_TYPE_A:
1959 return json_build(ret,
1960 JSON_BUILD_OBJECT(
1961 JSON_BUILD_PAIR("key", JSON_BUILD_VARIANT(k)),
1962 JSON_BUILD_PAIR("address", JSON_BUILD_IN4_ADDR(&rr->a.in_addr))));
1963
1964 case DNS_TYPE_AAAA:
1965 return json_build(ret,
1966 JSON_BUILD_OBJECT(
1967 JSON_BUILD_PAIR("key", JSON_BUILD_VARIANT(k)),
1968 JSON_BUILD_PAIR("address", JSON_BUILD_IN6_ADDR(&rr->aaaa.in6_addr))));
1969
1970 case DNS_TYPE_SOA:
1971 return json_build(ret,
1972 JSON_BUILD_OBJECT(
1973 JSON_BUILD_PAIR("key", JSON_BUILD_VARIANT(k)),
1974 JSON_BUILD_PAIR("mname", JSON_BUILD_STRING(rr->soa.mname)),
1975 JSON_BUILD_PAIR("rname", JSON_BUILD_STRING(rr->soa.rname)),
1976 JSON_BUILD_PAIR("serial", JSON_BUILD_UNSIGNED(rr->soa.serial)),
1977 JSON_BUILD_PAIR("refresh", JSON_BUILD_UNSIGNED(rr->soa.refresh)),
1978 JSON_BUILD_PAIR("expire", JSON_BUILD_UNSIGNED(rr->soa.retry)),
1979 JSON_BUILD_PAIR("minimum", JSON_BUILD_UNSIGNED(rr->soa.minimum))));
1980
1981 case DNS_TYPE_MX:
1982 return json_build(ret,
1983 JSON_BUILD_OBJECT(
1984 JSON_BUILD_PAIR("key", JSON_BUILD_VARIANT(k)),
1985 JSON_BUILD_PAIR("priority", JSON_BUILD_UNSIGNED(rr->mx.priority)),
1986 JSON_BUILD_PAIR("exchange", JSON_BUILD_STRING(rr->mx.exchange))));
1987 case DNS_TYPE_LOC:
1988 return json_build(ret,
1989 JSON_BUILD_OBJECT(
1990 JSON_BUILD_PAIR("key", JSON_BUILD_VARIANT(k)),
1991 JSON_BUILD_PAIR("version", JSON_BUILD_UNSIGNED(rr->loc.version)),
1992 JSON_BUILD_PAIR("size", JSON_BUILD_UNSIGNED(rr->loc.size)),
1993 JSON_BUILD_PAIR("horiz_pre", JSON_BUILD_UNSIGNED(rr->loc.horiz_pre)),
1994 JSON_BUILD_PAIR("vert_pre", JSON_BUILD_UNSIGNED(rr->loc.vert_pre)),
1995 JSON_BUILD_PAIR("latitude", JSON_BUILD_UNSIGNED(rr->loc.latitude)),
1996 JSON_BUILD_PAIR("longitude", JSON_BUILD_UNSIGNED(rr->loc.longitude)),
1997 JSON_BUILD_PAIR("altitude", JSON_BUILD_UNSIGNED(rr->loc.altitude))));
1998
1999 case DNS_TYPE_DS:
2000 return json_build(ret,
2001 JSON_BUILD_OBJECT(
2002 JSON_BUILD_PAIR("key", JSON_BUILD_VARIANT(k)),
2003 JSON_BUILD_PAIR("keyTag", JSON_BUILD_UNSIGNED(rr->ds.key_tag)),
2004 JSON_BUILD_PAIR("algorithm", JSON_BUILD_UNSIGNED(rr->ds.algorithm)),
2005 JSON_BUILD_PAIR("digestType", JSON_BUILD_UNSIGNED(rr->ds.digest_type)),
2006 JSON_BUILD_PAIR("digest", JSON_BUILD_HEX(rr->ds.digest, rr->ds.digest_size))));
2007
2008 case DNS_TYPE_SSHFP:
2009 return json_build(ret,
2010 JSON_BUILD_OBJECT(
2011 JSON_BUILD_PAIR("key", JSON_BUILD_VARIANT(k)),
2012 JSON_BUILD_PAIR("algorithm", JSON_BUILD_UNSIGNED(rr->sshfp.algorithm)),
2013 JSON_BUILD_PAIR("fptype", JSON_BUILD_UNSIGNED(rr->sshfp.fptype)),
2014 JSON_BUILD_PAIR("fingerprint", JSON_BUILD_HEX(rr->sshfp.fingerprint, rr->sshfp.fingerprint_size))));
2015
2016 case DNS_TYPE_DNSKEY:
2017 return json_build(ret,
2018 JSON_BUILD_OBJECT(
2019 JSON_BUILD_PAIR("key", JSON_BUILD_VARIANT(k)),
2020 JSON_BUILD_PAIR("flags", JSON_BUILD_UNSIGNED(rr->dnskey.flags)),
2021 JSON_BUILD_PAIR("protocol", JSON_BUILD_UNSIGNED(rr->dnskey.protocol)),
2022 JSON_BUILD_PAIR("algorithm", JSON_BUILD_UNSIGNED(rr->dnskey.algorithm)),
2023 JSON_BUILD_PAIR("dnskey", JSON_BUILD_BASE64(rr->dnskey.key, rr->dnskey.key_size))));
2024
2025
2026 case DNS_TYPE_RRSIG:
2027 return json_build(ret,
2028 JSON_BUILD_OBJECT(
2029 JSON_BUILD_PAIR("key", JSON_BUILD_VARIANT(k)),
2030 JSON_BUILD_PAIR("signer", JSON_BUILD_STRING(rr->rrsig.signer)),
2031 JSON_BUILD_PAIR("typeCovered", JSON_BUILD_UNSIGNED(rr->rrsig.type_covered)),
2032 JSON_BUILD_PAIR("algorithm", JSON_BUILD_UNSIGNED(rr->rrsig.algorithm)),
2033 JSON_BUILD_PAIR("labels", JSON_BUILD_UNSIGNED(rr->rrsig.labels)),
2034 JSON_BUILD_PAIR("originalTtl", JSON_BUILD_UNSIGNED(rr->rrsig.original_ttl)),
2035 JSON_BUILD_PAIR("expiration", JSON_BUILD_UNSIGNED(rr->rrsig.expiration)),
2036 JSON_BUILD_PAIR("inception", JSON_BUILD_UNSIGNED(rr->rrsig.inception)),
2037 JSON_BUILD_PAIR("keyTag", JSON_BUILD_UNSIGNED(rr->rrsig.key_tag)),
2038 JSON_BUILD_PAIR("signature", JSON_BUILD_BASE64(rr->rrsig.signature, rr->rrsig.signature_size))));
2039
2040 case DNS_TYPE_NSEC: {
2041 _cleanup_(json_variant_unrefp) JsonVariant *bm = NULL;
2042
2043 r = type_bitmap_to_json(rr->nsec.types, &bm);
2044 if (r < 0)
2045 return r;
2046
2047 return json_build(ret,
2048 JSON_BUILD_OBJECT(
2049 JSON_BUILD_PAIR("key", JSON_BUILD_VARIANT(k)),
2050 JSON_BUILD_PAIR("nextDomain", JSON_BUILD_STRING(rr->nsec.next_domain_name)),
2051 JSON_BUILD_PAIR("types", JSON_BUILD_VARIANT(bm))));
2052 }
2053
2054 case DNS_TYPE_NSEC3: {
2055 _cleanup_(json_variant_unrefp) JsonVariant *bm = NULL;
2056
2057 r = type_bitmap_to_json(rr->nsec3.types, &bm);
2058 if (r < 0)
2059 return r;
2060
2061 return json_build(ret,
2062 JSON_BUILD_OBJECT(
2063 JSON_BUILD_PAIR("key", JSON_BUILD_VARIANT(k)),
2064 JSON_BUILD_PAIR("algorithm", JSON_BUILD_UNSIGNED(rr->nsec3.algorithm)),
2065 JSON_BUILD_PAIR("flags", JSON_BUILD_UNSIGNED(rr->nsec3.flags)),
2066 JSON_BUILD_PAIR("iterations", JSON_BUILD_UNSIGNED(rr->nsec3.iterations)),
2067 JSON_BUILD_PAIR("salt", JSON_BUILD_HEX(rr->nsec3.salt, rr->nsec3.salt_size)),
2068 JSON_BUILD_PAIR("hash", JSON_BUILD_BASE32HEX(rr->nsec3.next_hashed_name, rr->nsec3.next_hashed_name_size)),
2069 JSON_BUILD_PAIR("types", JSON_BUILD_VARIANT(bm))));
2070 }
2071
2072 case DNS_TYPE_TLSA:
2073 return json_build(ret,
2074 JSON_BUILD_OBJECT(
2075 JSON_BUILD_PAIR("key", JSON_BUILD_VARIANT(k)),
2076 JSON_BUILD_PAIR("certUsage", JSON_BUILD_UNSIGNED(rr->tlsa.cert_usage)),
2077 JSON_BUILD_PAIR("selector", JSON_BUILD_UNSIGNED(rr->tlsa.selector)),
2078 JSON_BUILD_PAIR("matchingType", JSON_BUILD_UNSIGNED(rr->tlsa.matching_type)),
2079 JSON_BUILD_PAIR("data", JSON_BUILD_HEX(rr->tlsa.data, rr->tlsa.data_size))));
2080
2081 case DNS_TYPE_CAA:
2082 return json_build(ret,
2083 JSON_BUILD_OBJECT(
2084 JSON_BUILD_PAIR("key", JSON_BUILD_VARIANT(k)),
2085 JSON_BUILD_PAIR("flags", JSON_BUILD_UNSIGNED(rr->caa.flags)),
2086 JSON_BUILD_PAIR("tag", JSON_BUILD_STRING(rr->caa.tag)),
2087 JSON_BUILD_PAIR("value", JSON_BUILD_OCTESCAPE(rr->caa.value, rr->caa.value_size))));
2088
2089 default:
2090 /* Can't provide broken-down format */
2091 *ret = NULL;
2092 return 0;
2093 }
2094}
2095
8730bccf 2096static const char* const dnssec_algorithm_table[_DNSSEC_ALGORITHM_MAX_DEFINED] = {
6f717d08 2097 /* Mnemonics as listed on https://www.iana.org/assignments/dns-sec-alg-numbers/dns-sec-alg-numbers.xhtml */
8730bccf
LP		 2098 [DNSSEC_ALGORITHM_RSAMD5] = "RSAMD5",
2099 [DNSSEC_ALGORITHM_DH] = "DH",
2100 [DNSSEC_ALGORITHM_DSA] = "DSA",
2101 [DNSSEC_ALGORITHM_ECC] = "ECC",
2102 [DNSSEC_ALGORITHM_RSASHA1] = "RSASHA1",
2103 [DNSSEC_ALGORITHM_DSA_NSEC3_SHA1] = "DSA-NSEC3-SHA1",
2104 [DNSSEC_ALGORITHM_RSASHA1_NSEC3_SHA1] = "RSASHA1-NSEC3-SHA1",
2105 [DNSSEC_ALGORITHM_RSASHA256] = "RSASHA256",
2106 [DNSSEC_ALGORITHM_RSASHA512] = "RSASHA512",
6f717d08
LP		 2107 [DNSSEC_ALGORITHM_ECC_GOST] = "ECC-GOST",
2108 [DNSSEC_ALGORITHM_ECDSAP256SHA256] = "ECDSAP256SHA256",
2109 [DNSSEC_ALGORITHM_ECDSAP384SHA384] = "ECDSAP384SHA384",
cb9eeb06
MCO		 2110 [DNSSEC_ALGORITHM_ED25519] = "ED25519",
2111 [DNSSEC_ALGORITHM_ED448] = "ED448",
8730bccf
LP		 2112 [DNSSEC_ALGORITHM_INDIRECT] = "INDIRECT",
2113 [DNSSEC_ALGORITHM_PRIVATEDNS] = "PRIVATEDNS",
2114 [DNSSEC_ALGORITHM_PRIVATEOID] = "PRIVATEOID",
2115};
8e54f5d9 2116DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(dnssec_algorithm, int, 255);
8730bccf
LP		 2117
2118static const char* const dnssec_digest_table[_DNSSEC_DIGEST_MAX_DEFINED] = {
6f717d08 2119 /* Names as listed on https://www.iana.org/assignments/ds-rr-types/ds-rr-types.xhtml */
e3e64a1a
ZJS		 2120 [DNSSEC_DIGEST_SHA1] = "SHA-1",
2121 [DNSSEC_DIGEST_SHA256] = "SHA-256",
6f717d08 2122 [DNSSEC_DIGEST_GOST_R_34_11_94] = "GOST_R_34.11-94",
e3e64a1a 2123 [DNSSEC_DIGEST_SHA384] = "SHA-384",
8730bccf 2124};
8e54f5d9 2125DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(dnssec_digest, int, 255);
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