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74b2466e LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2014 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | #include "utf8.h" | |
c73ce96b | 23 | #include "util.h" |
2e276efc | 24 | #include "strv.h" |
74b2466e LP |
25 | #include "resolved-dns-domain.h" |
26 | #include "resolved-dns-packet.h" | |
27 | ||
1716f6dc | 28 | int dns_packet_new(DnsPacket **ret, DnsProtocol protocol, size_t mtu) { |
74b2466e LP |
29 | DnsPacket *p; |
30 | size_t a; | |
31 | ||
32 | assert(ret); | |
33 | ||
34 | if (mtu <= 0) | |
35 | a = DNS_PACKET_SIZE_START; | |
36 | else | |
37 | a = mtu; | |
38 | ||
39 | if (a < DNS_PACKET_HEADER_SIZE) | |
40 | a = DNS_PACKET_HEADER_SIZE; | |
41 | ||
c73ce96b LP |
42 | /* round up to next page size */ |
43 | a = PAGE_ALIGN(ALIGN(sizeof(DnsPacket)) + a) - ALIGN(sizeof(DnsPacket)); | |
44 | ||
45 | /* make sure we never allocate more than useful */ | |
46 | if (a > DNS_PACKET_SIZE_MAX) | |
47 | a = DNS_PACKET_SIZE_MAX; | |
48 | ||
74b2466e LP |
49 | p = malloc0(ALIGN(sizeof(DnsPacket)) + a); |
50 | if (!p) | |
51 | return -ENOMEM; | |
52 | ||
53 | p->size = p->rindex = DNS_PACKET_HEADER_SIZE; | |
54 | p->allocated = a; | |
1716f6dc | 55 | p->protocol = protocol; |
74b2466e LP |
56 | p->n_ref = 1; |
57 | ||
58 | *ret = p; | |
59 | ||
60 | return 0; | |
61 | } | |
62 | ||
1716f6dc | 63 | int dns_packet_new_query(DnsPacket **ret, DnsProtocol protocol, size_t mtu) { |
74b2466e LP |
64 | DnsPacket *p; |
65 | DnsPacketHeader *h; | |
66 | int r; | |
67 | ||
68 | assert(ret); | |
69 | ||
1716f6dc | 70 | r = dns_packet_new(&p, protocol, mtu); |
74b2466e LP |
71 | if (r < 0) |
72 | return r; | |
73 | ||
74 | h = DNS_PACKET_HEADER(p); | |
1716f6dc | 75 | |
ea917db9 LP |
76 | if (protocol == DNS_PROTOCOL_LLMNR) |
77 | h->flags = htobe16(DNS_PACKET_MAKE_FLAGS(0 /* qr */, | |
78 | 0 /* opcode */, | |
79 | 0 /* c */, | |
80 | 0 /* tc */, | |
81 | 0 /* t */, | |
82 | 0 /* ra */, | |
83 | 0 /* ad */, | |
84 | 0 /* cd */, | |
85 | 0 /* rcode */)); | |
1716f6dc | 86 | else |
ea917db9 LP |
87 | h->flags = htobe16(DNS_PACKET_MAKE_FLAGS(0 /* qr */, |
88 | 0 /* opcode */, | |
89 | 0 /* aa */, | |
90 | 0 /* tc */, | |
91 | 1 /* rd (ask for recursion) */, | |
92 | 0 /* ra */, | |
93 | 0 /* ad */, | |
94 | 0 /* cd */, | |
95 | 0 /* rcode */)); | |
74b2466e LP |
96 | |
97 | *ret = p; | |
98 | return 0; | |
99 | } | |
100 | ||
101 | DnsPacket *dns_packet_ref(DnsPacket *p) { | |
102 | ||
103 | if (!p) | |
104 | return NULL; | |
105 | ||
106 | assert(p->n_ref > 0); | |
107 | p->n_ref++; | |
108 | return p; | |
109 | } | |
110 | ||
111 | static void dns_packet_free(DnsPacket *p) { | |
112 | char *s; | |
113 | ||
114 | assert(p); | |
115 | ||
faa133f3 LP |
116 | dns_question_unref(p->question); |
117 | dns_answer_unref(p->answer); | |
322345fd | 118 | |
74b2466e LP |
119 | while ((s = hashmap_steal_first_key(p->names))) |
120 | free(s); | |
121 | hashmap_free(p->names); | |
122 | ||
faa133f3 | 123 | free(p->_data); |
74b2466e LP |
124 | free(p); |
125 | } | |
126 | ||
127 | DnsPacket *dns_packet_unref(DnsPacket *p) { | |
128 | if (!p) | |
129 | return NULL; | |
130 | ||
131 | assert(p->n_ref > 0); | |
132 | ||
133 | if (p->n_ref == 1) | |
134 | dns_packet_free(p); | |
135 | else | |
136 | p->n_ref--; | |
137 | ||
138 | return NULL; | |
139 | } | |
140 | ||
141 | int dns_packet_validate(DnsPacket *p) { | |
142 | assert(p); | |
143 | ||
144 | if (p->size < DNS_PACKET_HEADER_SIZE) | |
145 | return -EBADMSG; | |
146 | ||
c73ce96b LP |
147 | if (p->size > DNS_PACKET_SIZE_MAX) |
148 | return -EBADMSG; | |
149 | ||
623a4c97 | 150 | return 1; |
74b2466e LP |
151 | } |
152 | ||
153 | int dns_packet_validate_reply(DnsPacket *p) { | |
74b2466e LP |
154 | int r; |
155 | ||
156 | assert(p); | |
157 | ||
158 | r = dns_packet_validate(p); | |
159 | if (r < 0) | |
160 | return r; | |
161 | ||
623a4c97 LP |
162 | if (DNS_PACKET_QR(p) != 1) |
163 | return 0; | |
164 | ||
165 | if (DNS_PACKET_OPCODE(p) != 0) | |
74b2466e LP |
166 | return -EBADMSG; |
167 | ||
ea917db9 LP |
168 | /* RFC 4795, Section 2.1.1. says to discard all replies with QDCOUNT != 1 */ |
169 | if (p->protocol == DNS_PROTOCOL_LLMNR && | |
170 | DNS_PACKET_QDCOUNT(p) != 1) | |
171 | return -EBADMSG; | |
172 | ||
623a4c97 LP |
173 | return 1; |
174 | } | |
175 | ||
176 | int dns_packet_validate_query(DnsPacket *p) { | |
177 | int r; | |
178 | ||
179 | assert(p); | |
180 | ||
181 | r = dns_packet_validate(p); | |
182 | if (r < 0) | |
183 | return r; | |
184 | ||
185 | if (DNS_PACKET_QR(p) != 0) | |
186 | return 0; | |
187 | ||
3cb10d3a | 188 | if (DNS_PACKET_OPCODE(p) != 0) |
74b2466e LP |
189 | return -EBADMSG; |
190 | ||
623a4c97 LP |
191 | if (DNS_PACKET_TC(p)) |
192 | return -EBADMSG; | |
193 | ||
ea917db9 | 194 | /* RFC 4795, Section 2.1.1. says to discard all queries with QDCOUNT != 1 */ |
623a4c97 LP |
195 | if (p->protocol == DNS_PROTOCOL_LLMNR && |
196 | DNS_PACKET_QDCOUNT(p) != 1) | |
197 | return -EBADMSG; | |
198 | ||
ea917db9 | 199 | /* RFC 4795, Section 2.1.1. says to discard all queries with ANCOUNT != 0 */ |
623a4c97 LP |
200 | if (DNS_PACKET_ANCOUNT(p) > 0) |
201 | return -EBADMSG; | |
202 | ||
ea917db9 | 203 | /* RFC 4795, Section 2.1.1. says to discard all queries with NSCOUNT != 0 */ |
623a4c97 LP |
204 | if (DNS_PACKET_NSCOUNT(p) > 0) |
205 | return -EBADMSG; | |
206 | ||
207 | return 1; | |
74b2466e LP |
208 | } |
209 | ||
210 | static int dns_packet_extend(DnsPacket *p, size_t add, void **ret, size_t *start) { | |
211 | assert(p); | |
212 | ||
c73ce96b LP |
213 | if (p->size + add > p->allocated) { |
214 | size_t a; | |
215 | ||
216 | a = PAGE_ALIGN((p->size + add) * 2); | |
217 | if (a > DNS_PACKET_SIZE_MAX) | |
218 | a = DNS_PACKET_SIZE_MAX; | |
219 | ||
220 | if (p->size + add > a) | |
221 | return -EMSGSIZE; | |
222 | ||
faa133f3 | 223 | if (p->_data) { |
c73ce96b LP |
224 | void *d; |
225 | ||
faa133f3 | 226 | d = realloc(p->_data, a); |
c73ce96b LP |
227 | if (!d) |
228 | return -ENOMEM; | |
229 | ||
faa133f3 | 230 | p->_data = d; |
c73ce96b | 231 | } else { |
faa133f3 LP |
232 | p->_data = malloc(a); |
233 | if (!p->_data) | |
c73ce96b LP |
234 | return -ENOMEM; |
235 | ||
faa133f3 LP |
236 | memcpy(p->_data, (uint8_t*) p + ALIGN(sizeof(DnsPacket)), p->size); |
237 | memzero((uint8_t*) p->_data + p->size, a - p->size); | |
c73ce96b LP |
238 | } |
239 | ||
240 | p->allocated = a; | |
241 | } | |
74b2466e LP |
242 | |
243 | if (start) | |
244 | *start = p->size; | |
245 | ||
246 | if (ret) | |
247 | *ret = (uint8_t*) DNS_PACKET_DATA(p) + p->size; | |
248 | ||
249 | p->size += add; | |
250 | return 0; | |
251 | } | |
252 | ||
253 | static void dns_packet_truncate(DnsPacket *p, size_t sz) { | |
254 | Iterator i; | |
255 | char *s; | |
256 | void *n; | |
257 | ||
258 | assert(p); | |
259 | ||
260 | if (p->size <= sz) | |
261 | return; | |
262 | ||
263 | HASHMAP_FOREACH_KEY(s, n, p->names, i) { | |
264 | ||
265 | if (PTR_TO_SIZE(n) < sz) | |
266 | continue; | |
267 | ||
268 | hashmap_remove(p->names, s); | |
269 | free(s); | |
270 | } | |
271 | ||
272 | p->size = sz; | |
273 | } | |
274 | ||
623a4c97 LP |
275 | int dns_packet_append_blob(DnsPacket *p, const void *d, size_t l, size_t *start) { |
276 | void *q; | |
277 | int r; | |
278 | ||
279 | assert(p); | |
280 | ||
281 | r = dns_packet_extend(p, l, &q, start); | |
282 | if (r < 0) | |
283 | return r; | |
284 | ||
285 | memcpy(q, d, l); | |
286 | return 0; | |
287 | } | |
288 | ||
74b2466e LP |
289 | int dns_packet_append_uint8(DnsPacket *p, uint8_t v, size_t *start) { |
290 | void *d; | |
291 | int r; | |
292 | ||
293 | assert(p); | |
294 | ||
295 | r = dns_packet_extend(p, sizeof(uint8_t), &d, start); | |
296 | if (r < 0) | |
297 | return r; | |
298 | ||
299 | ((uint8_t*) d)[0] = v; | |
300 | ||
301 | return 0; | |
302 | } | |
303 | ||
304 | int dns_packet_append_uint16(DnsPacket *p, uint16_t v, size_t *start) { | |
305 | void *d; | |
306 | int r; | |
307 | ||
308 | assert(p); | |
309 | ||
310 | r = dns_packet_extend(p, sizeof(uint16_t), &d, start); | |
311 | if (r < 0) | |
312 | return r; | |
313 | ||
314 | ((uint8_t*) d)[0] = (uint8_t) (v >> 8); | |
623a4c97 LP |
315 | ((uint8_t*) d)[1] = (uint8_t) v; |
316 | ||
317 | return 0; | |
318 | } | |
319 | ||
320 | int dns_packet_append_uint32(DnsPacket *p, uint32_t v, size_t *start) { | |
321 | void *d; | |
322 | int r; | |
323 | ||
324 | assert(p); | |
325 | ||
326 | r = dns_packet_extend(p, sizeof(uint32_t), &d, start); | |
327 | if (r < 0) | |
328 | return r; | |
329 | ||
330 | ((uint8_t*) d)[0] = (uint8_t) (v >> 24); | |
331 | ((uint8_t*) d)[1] = (uint8_t) (v >> 16); | |
332 | ((uint8_t*) d)[2] = (uint8_t) (v >> 8); | |
333 | ((uint8_t*) d)[3] = (uint8_t) v; | |
74b2466e LP |
334 | |
335 | return 0; | |
336 | } | |
337 | ||
338 | int dns_packet_append_string(DnsPacket *p, const char *s, size_t *start) { | |
339 | void *d; | |
340 | size_t l; | |
341 | int r; | |
342 | ||
343 | assert(p); | |
344 | assert(s); | |
345 | ||
346 | l = strlen(s); | |
347 | if (l > 255) | |
348 | return -E2BIG; | |
349 | ||
350 | r = dns_packet_extend(p, 1 + l, &d, start); | |
351 | if (r < 0) | |
352 | return r; | |
353 | ||
354 | ((uint8_t*) d)[0] = (uint8_t) l; | |
355 | memcpy(((uint8_t*) d) + 1, s, l); | |
356 | ||
357 | return 0; | |
358 | } | |
359 | ||
360 | int dns_packet_append_label(DnsPacket *p, const char *d, size_t l, size_t *start) { | |
361 | void *w; | |
362 | int r; | |
363 | ||
364 | assert(p); | |
365 | assert(d); | |
366 | ||
367 | if (l > DNS_LABEL_MAX) | |
368 | return -E2BIG; | |
369 | ||
370 | r = dns_packet_extend(p, 1 + l, &w, start); | |
371 | if (r < 0) | |
372 | return r; | |
373 | ||
374 | ((uint8_t*) w)[0] = (uint8_t) l; | |
375 | memcpy(((uint8_t*) w) + 1, d, l); | |
376 | ||
377 | return 0; | |
378 | } | |
379 | ||
151226ab ZJS |
380 | int dns_packet_append_name(DnsPacket *p, const char *name, |
381 | bool allow_compression, size_t *start) { | |
74b2466e LP |
382 | size_t saved_size; |
383 | int r; | |
384 | ||
385 | assert(p); | |
386 | assert(name); | |
387 | ||
388 | saved_size = p->size; | |
389 | ||
390 | while (*name) { | |
391 | _cleanup_free_ char *s = NULL; | |
392 | char label[DNS_LABEL_MAX]; | |
151226ab | 393 | size_t n = 0; |
bdf10b5b | 394 | int k; |
74b2466e | 395 | |
151226ab ZJS |
396 | if (allow_compression) |
397 | n = PTR_TO_SIZE(hashmap_get(p->names, name)); | |
74b2466e LP |
398 | if (n > 0) { |
399 | assert(n < p->size); | |
400 | ||
401 | if (n < 0x4000) { | |
402 | r = dns_packet_append_uint16(p, 0xC000 | n, NULL); | |
403 | if (r < 0) | |
404 | goto fail; | |
405 | ||
406 | goto done; | |
407 | } | |
408 | } | |
409 | ||
410 | s = strdup(name); | |
411 | if (!s) { | |
412 | r = -ENOMEM; | |
413 | goto fail; | |
414 | } | |
415 | ||
416 | r = dns_label_unescape(&name, label, sizeof(label)); | |
417 | if (r < 0) | |
418 | goto fail; | |
419 | ||
bdf10b5b LP |
420 | if (p->protocol == DNS_PROTOCOL_DNS) |
421 | k = dns_label_apply_idna(label, r, label, sizeof(label)); | |
422 | else | |
423 | k = dns_label_undo_idna(label, r, label, sizeof(label)); | |
424 | if (k < 0) { | |
425 | r = k; | |
426 | goto fail; | |
427 | } | |
428 | if (k > 0) | |
429 | r = k; | |
430 | ||
74b2466e LP |
431 | r = dns_packet_append_label(p, label, r, &n); |
432 | if (r < 0) | |
433 | goto fail; | |
434 | ||
151226ab ZJS |
435 | if (allow_compression) { |
436 | r = hashmap_ensure_allocated(&p->names, | |
437 | dns_name_hash_func, | |
438 | dns_name_compare_func); | |
439 | if (r < 0) | |
440 | goto fail; | |
74b2466e | 441 | |
151226ab ZJS |
442 | r = hashmap_put(p->names, s, SIZE_TO_PTR(n)); |
443 | if (r < 0) | |
444 | goto fail; | |
74b2466e | 445 | |
151226ab ZJS |
446 | s = NULL; |
447 | } | |
74b2466e LP |
448 | } |
449 | ||
450 | r = dns_packet_append_uint8(p, 0, NULL); | |
451 | if (r < 0) | |
452 | return r; | |
453 | ||
454 | done: | |
455 | if (start) | |
456 | *start = saved_size; | |
457 | ||
458 | return 0; | |
459 | ||
460 | fail: | |
461 | dns_packet_truncate(p, saved_size); | |
462 | return r; | |
463 | } | |
464 | ||
465 | int dns_packet_append_key(DnsPacket *p, const DnsResourceKey *k, size_t *start) { | |
466 | size_t saved_size; | |
467 | int r; | |
468 | ||
469 | assert(p); | |
470 | assert(k); | |
471 | ||
472 | saved_size = p->size; | |
473 | ||
151226ab | 474 | r = dns_packet_append_name(p, DNS_RESOURCE_KEY_NAME(k), true, NULL); |
74b2466e LP |
475 | if (r < 0) |
476 | goto fail; | |
477 | ||
478 | r = dns_packet_append_uint16(p, k->type, NULL); | |
479 | if (r < 0) | |
480 | goto fail; | |
481 | ||
482 | r = dns_packet_append_uint16(p, k->class, NULL); | |
483 | if (r < 0) | |
484 | goto fail; | |
485 | ||
486 | if (start) | |
487 | *start = saved_size; | |
488 | ||
489 | return 0; | |
490 | ||
491 | fail: | |
492 | dns_packet_truncate(p, saved_size); | |
493 | return r; | |
494 | } | |
495 | ||
623a4c97 LP |
496 | int dns_packet_append_rr(DnsPacket *p, const DnsResourceRecord *rr, size_t *start) { |
497 | size_t saved_size, rdlength_offset, end, rdlength; | |
498 | int r; | |
499 | ||
500 | assert(p); | |
501 | assert(rr); | |
502 | ||
503 | saved_size = p->size; | |
504 | ||
505 | r = dns_packet_append_key(p, rr->key, NULL); | |
506 | if (r < 0) | |
507 | goto fail; | |
508 | ||
509 | r = dns_packet_append_uint32(p, rr->ttl, NULL); | |
510 | if (r < 0) | |
511 | goto fail; | |
512 | ||
513 | /* Initially we write 0 here */ | |
514 | r = dns_packet_append_uint16(p, 0, &rdlength_offset); | |
515 | if (r < 0) | |
516 | goto fail; | |
517 | ||
0dae31d4 | 518 | switch (rr->unparseable ? _DNS_TYPE_INVALID : rr->key->type) { |
623a4c97 | 519 | |
9c92ce6d LP |
520 | case DNS_TYPE_SRV: |
521 | r = dns_packet_append_uint16(p, rr->srv.priority, NULL); | |
522 | if (r < 0) | |
523 | goto fail; | |
524 | ||
525 | r = dns_packet_append_uint16(p, rr->srv.weight, NULL); | |
526 | if (r < 0) | |
527 | goto fail; | |
528 | ||
529 | r = dns_packet_append_uint16(p, rr->srv.port, NULL); | |
530 | if (r < 0) | |
531 | goto fail; | |
532 | ||
151226ab | 533 | r = dns_packet_append_name(p, rr->srv.name, true, NULL); |
9c92ce6d LP |
534 | break; |
535 | ||
623a4c97 LP |
536 | case DNS_TYPE_PTR: |
537 | case DNS_TYPE_NS: | |
538 | case DNS_TYPE_CNAME: | |
8ac4e9e1 | 539 | case DNS_TYPE_DNAME: |
151226ab | 540 | r = dns_packet_append_name(p, rr->ptr.name, true, NULL); |
623a4c97 LP |
541 | break; |
542 | ||
543 | case DNS_TYPE_HINFO: | |
544 | r = dns_packet_append_string(p, rr->hinfo.cpu, NULL); | |
545 | if (r < 0) | |
546 | goto fail; | |
547 | ||
548 | r = dns_packet_append_string(p, rr->hinfo.os, NULL); | |
549 | break; | |
550 | ||
9de3e329 | 551 | case DNS_TYPE_SPF: /* exactly the same as TXT */ |
2e276efc ZJS |
552 | case DNS_TYPE_TXT: { |
553 | char **s; | |
554 | ||
555 | STRV_FOREACH(s, rr->txt.strings) { | |
556 | r = dns_packet_append_string(p, *s, NULL); | |
557 | if (r < 0) | |
558 | goto fail; | |
559 | } | |
560 | ||
6a6fc3df | 561 | r = 0; |
2e276efc ZJS |
562 | break; |
563 | } | |
564 | ||
623a4c97 LP |
565 | case DNS_TYPE_A: |
566 | r = dns_packet_append_blob(p, &rr->a.in_addr, sizeof(struct in_addr), NULL); | |
567 | break; | |
568 | ||
569 | case DNS_TYPE_AAAA: | |
570 | r = dns_packet_append_blob(p, &rr->aaaa.in6_addr, sizeof(struct in6_addr), NULL); | |
571 | break; | |
572 | ||
573 | case DNS_TYPE_SOA: | |
151226ab | 574 | r = dns_packet_append_name(p, rr->soa.mname, true, NULL); |
623a4c97 LP |
575 | if (r < 0) |
576 | goto fail; | |
577 | ||
151226ab | 578 | r = dns_packet_append_name(p, rr->soa.rname, true, NULL); |
623a4c97 LP |
579 | if (r < 0) |
580 | goto fail; | |
581 | ||
582 | r = dns_packet_append_uint32(p, rr->soa.serial, NULL); | |
583 | if (r < 0) | |
584 | goto fail; | |
585 | ||
586 | r = dns_packet_append_uint32(p, rr->soa.refresh, NULL); | |
587 | if (r < 0) | |
588 | goto fail; | |
589 | ||
590 | r = dns_packet_append_uint32(p, rr->soa.retry, NULL); | |
591 | if (r < 0) | |
592 | goto fail; | |
593 | ||
594 | r = dns_packet_append_uint32(p, rr->soa.expire, NULL); | |
595 | if (r < 0) | |
596 | goto fail; | |
597 | ||
598 | r = dns_packet_append_uint32(p, rr->soa.minimum, NULL); | |
599 | break; | |
600 | ||
601 | case DNS_TYPE_MX: | |
946c7094 ZJS |
602 | r = dns_packet_append_uint16(p, rr->mx.priority, NULL); |
603 | if (r < 0) | |
604 | goto fail; | |
605 | ||
151226ab | 606 | r = dns_packet_append_name(p, rr->mx.exchange, true, NULL); |
946c7094 ZJS |
607 | break; |
608 | ||
0dae31d4 ZJS |
609 | case DNS_TYPE_LOC: |
610 | r = dns_packet_append_uint8(p, rr->loc.version, NULL); | |
611 | if (r < 0) | |
612 | goto fail; | |
613 | ||
614 | r = dns_packet_append_uint8(p, rr->loc.size, NULL); | |
615 | if (r < 0) | |
616 | goto fail; | |
617 | ||
618 | r = dns_packet_append_uint8(p, rr->loc.horiz_pre, NULL); | |
619 | if (r < 0) | |
620 | goto fail; | |
621 | ||
622 | r = dns_packet_append_uint8(p, rr->loc.vert_pre, NULL); | |
623 | if (r < 0) | |
624 | goto fail; | |
625 | ||
afbc4f26 | 626 | r = dns_packet_append_uint32(p, rr->loc.latitude, NULL); |
0dae31d4 ZJS |
627 | if (r < 0) |
628 | goto fail; | |
629 | ||
afbc4f26 | 630 | r = dns_packet_append_uint32(p, rr->loc.longitude, NULL); |
0dae31d4 ZJS |
631 | if (r < 0) |
632 | goto fail; | |
633 | ||
afbc4f26 | 634 | r = dns_packet_append_uint32(p, rr->loc.altitude, NULL); |
0dae31d4 ZJS |
635 | break; |
636 | ||
623a4c97 | 637 | case DNS_TYPE_SSHFP: |
42cc2eeb LP |
638 | r = dns_packet_append_uint8(p, rr->sshfp.algorithm, NULL); |
639 | if (r < 0) | |
640 | goto fail; | |
8db0d2f5 | 641 | |
42cc2eeb LP |
642 | r = dns_packet_append_uint8(p, rr->sshfp.fptype, NULL); |
643 | if (r < 0) | |
644 | goto fail; | |
645 | ||
646 | r = dns_packet_append_blob(p, rr->sshfp.key, rr->sshfp.key_size, NULL); | |
647 | break; | |
648 | ||
8db0d2f5 ZJS |
649 | case DNS_TYPE_DNSKEY: |
650 | r = dns_packet_append_uint16(p, dnskey_to_flags(rr), NULL); | |
651 | if (r < 0) | |
652 | goto fail; | |
653 | ||
654 | r = dns_packet_append_uint8(p, 3u, NULL); | |
655 | if (r < 0) | |
656 | goto fail; | |
657 | ||
658 | r = dns_packet_append_uint8(p, rr->dnskey.algorithm, NULL); | |
659 | if (r < 0) | |
660 | goto fail; | |
661 | ||
662 | r = dns_packet_append_blob(p, rr->dnskey.key, rr->dnskey.key_size, NULL); | |
663 | break; | |
664 | ||
151226ab ZJS |
665 | case DNS_TYPE_RRSIG: |
666 | r = dns_packet_append_uint16(p, rr->rrsig.type_covered, NULL); | |
667 | if (r < 0) | |
668 | goto fail; | |
669 | ||
670 | r = dns_packet_append_uint8(p, rr->rrsig.algorithm, NULL); | |
671 | if (r < 0) | |
672 | goto fail; | |
673 | ||
674 | r = dns_packet_append_uint8(p, rr->rrsig.labels, NULL); | |
675 | if (r < 0) | |
676 | goto fail; | |
677 | ||
678 | r = dns_packet_append_uint32(p, rr->rrsig.original_ttl, NULL); | |
679 | if (r < 0) | |
680 | goto fail; | |
681 | ||
682 | r = dns_packet_append_uint32(p, rr->rrsig.expiration, NULL); | |
683 | if (r < 0) | |
684 | goto fail; | |
685 | ||
686 | r = dns_packet_append_uint32(p, rr->rrsig.inception, NULL); | |
687 | if (r < 0) | |
688 | goto fail; | |
689 | ||
690 | r = dns_packet_append_uint8(p, rr->rrsig.key_tag, NULL); | |
691 | if (r < 0) | |
692 | goto fail; | |
693 | ||
694 | r = dns_packet_append_name(p, rr->rrsig.signer, false, NULL); | |
695 | if (r < 0) | |
696 | goto fail; | |
697 | ||
698 | r = dns_packet_append_blob(p, rr->rrsig.signature, rr->rrsig.signature_size, NULL); | |
699 | break; | |
700 | ||
0dae31d4 | 701 | case _DNS_TYPE_INVALID: /* unparseable */ |
623a4c97 | 702 | default: |
0dae31d4 | 703 | |
623a4c97 LP |
704 | r = dns_packet_append_blob(p, rr->generic.data, rr->generic.size, NULL); |
705 | break; | |
706 | } | |
707 | if (r < 0) | |
708 | goto fail; | |
709 | ||
710 | /* Let's calculate the actual data size and update the field */ | |
711 | rdlength = p->size - rdlength_offset - sizeof(uint16_t); | |
712 | if (rdlength > 0xFFFF) { | |
713 | r = ENOSPC; | |
714 | goto fail; | |
715 | } | |
716 | ||
717 | end = p->size; | |
718 | p->size = rdlength_offset; | |
719 | r = dns_packet_append_uint16(p, rdlength, NULL); | |
720 | if (r < 0) | |
721 | goto fail; | |
722 | p->size = end; | |
723 | ||
351e6342 LP |
724 | if (start) |
725 | *start = saved_size; | |
726 | ||
623a4c97 LP |
727 | return 0; |
728 | ||
729 | fail: | |
730 | dns_packet_truncate(p, saved_size); | |
731 | return r; | |
732 | } | |
733 | ||
734 | ||
74b2466e LP |
735 | int dns_packet_read(DnsPacket *p, size_t sz, const void **ret, size_t *start) { |
736 | assert(p); | |
737 | ||
738 | if (p->rindex + sz > p->size) | |
739 | return -EMSGSIZE; | |
740 | ||
741 | if (ret) | |
742 | *ret = (uint8_t*) DNS_PACKET_DATA(p) + p->rindex; | |
743 | ||
744 | if (start) | |
745 | *start = p->rindex; | |
746 | ||
747 | p->rindex += sz; | |
748 | return 0; | |
749 | } | |
750 | ||
8ba9fd9c | 751 | void dns_packet_rewind(DnsPacket *p, size_t idx) { |
74b2466e LP |
752 | assert(p); |
753 | assert(idx <= p->size); | |
754 | assert(idx >= DNS_PACKET_HEADER_SIZE); | |
755 | ||
756 | p->rindex = idx; | |
757 | } | |
758 | ||
623a4c97 LP |
759 | int dns_packet_read_blob(DnsPacket *p, void *d, size_t sz, size_t *start) { |
760 | const void *q; | |
761 | int r; | |
762 | ||
763 | assert(p); | |
764 | assert(d); | |
765 | ||
766 | r = dns_packet_read(p, sz, &q, start); | |
767 | if (r < 0) | |
768 | return r; | |
769 | ||
770 | memcpy(d, q, sz); | |
771 | return 0; | |
772 | } | |
773 | ||
74b2466e LP |
774 | int dns_packet_read_uint8(DnsPacket *p, uint8_t *ret, size_t *start) { |
775 | const void *d; | |
776 | int r; | |
777 | ||
778 | assert(p); | |
779 | ||
780 | r = dns_packet_read(p, sizeof(uint8_t), &d, start); | |
781 | if (r < 0) | |
782 | return r; | |
783 | ||
784 | *ret = ((uint8_t*) d)[0]; | |
785 | return 0; | |
786 | } | |
787 | ||
788 | int dns_packet_read_uint16(DnsPacket *p, uint16_t *ret, size_t *start) { | |
789 | const void *d; | |
790 | int r; | |
791 | ||
792 | assert(p); | |
793 | ||
794 | r = dns_packet_read(p, sizeof(uint16_t), &d, start); | |
795 | if (r < 0) | |
796 | return r; | |
797 | ||
798 | *ret = (((uint16_t) ((uint8_t*) d)[0]) << 8) | | |
799 | ((uint16_t) ((uint8_t*) d)[1]); | |
800 | return 0; | |
801 | } | |
802 | ||
803 | int dns_packet_read_uint32(DnsPacket *p, uint32_t *ret, size_t *start) { | |
804 | const void *d; | |
805 | int r; | |
806 | ||
807 | assert(p); | |
808 | ||
809 | r = dns_packet_read(p, sizeof(uint32_t), &d, start); | |
810 | if (r < 0) | |
811 | return r; | |
812 | ||
813 | *ret = (((uint32_t) ((uint8_t*) d)[0]) << 24) | | |
814 | (((uint32_t) ((uint8_t*) d)[1]) << 16) | | |
815 | (((uint32_t) ((uint8_t*) d)[2]) << 8) | | |
816 | ((uint32_t) ((uint8_t*) d)[3]); | |
817 | ||
818 | return 0; | |
819 | } | |
820 | ||
821 | int dns_packet_read_string(DnsPacket *p, char **ret, size_t *start) { | |
822 | size_t saved_rindex; | |
823 | const void *d; | |
824 | char *t; | |
825 | uint8_t c; | |
826 | int r; | |
827 | ||
828 | assert(p); | |
829 | ||
830 | saved_rindex = p->rindex; | |
831 | ||
832 | r = dns_packet_read_uint8(p, &c, NULL); | |
833 | if (r < 0) | |
834 | goto fail; | |
835 | ||
836 | r = dns_packet_read(p, c, &d, NULL); | |
837 | if (r < 0) | |
838 | goto fail; | |
839 | ||
840 | if (memchr(d, 0, c)) { | |
841 | r = -EBADMSG; | |
842 | goto fail; | |
843 | } | |
844 | ||
845 | t = strndup(d, c); | |
846 | if (!t) { | |
847 | r = -ENOMEM; | |
848 | goto fail; | |
849 | } | |
850 | ||
851 | if (!utf8_is_valid(t)) { | |
852 | free(t); | |
853 | r = -EBADMSG; | |
854 | goto fail; | |
855 | } | |
856 | ||
857 | *ret = t; | |
858 | ||
859 | if (start) | |
860 | *start = saved_rindex; | |
861 | ||
862 | return 0; | |
863 | ||
864 | fail: | |
865 | dns_packet_rewind(p, saved_rindex); | |
866 | return r; | |
867 | } | |
868 | ||
151226ab ZJS |
869 | int dns_packet_read_name(DnsPacket *p, char **_ret, |
870 | bool allow_compression, size_t *start) { | |
74b2466e LP |
871 | size_t saved_rindex, after_rindex = 0; |
872 | _cleanup_free_ char *ret = NULL; | |
873 | size_t n = 0, allocated = 0; | |
874 | bool first = true; | |
875 | int r; | |
876 | ||
877 | assert(p); | |
878 | assert(_ret); | |
879 | ||
880 | saved_rindex = p->rindex; | |
881 | ||
882 | for (;;) { | |
883 | uint8_t c, d; | |
884 | ||
885 | r = dns_packet_read_uint8(p, &c, NULL); | |
886 | if (r < 0) | |
887 | goto fail; | |
888 | ||
889 | if (c == 0) | |
890 | /* End of name */ | |
891 | break; | |
892 | else if (c <= 63) { | |
893 | _cleanup_free_ char *t = NULL; | |
894 | const char *label; | |
895 | ||
896 | /* Literal label */ | |
897 | r = dns_packet_read(p, c, (const void**) &label, NULL); | |
898 | if (r < 0) | |
899 | goto fail; | |
900 | ||
901 | r = dns_label_escape(label, c, &t); | |
902 | if (r < 0) | |
903 | goto fail; | |
904 | ||
905 | if (!GREEDY_REALLOC(ret, allocated, n + !first + strlen(t) + 1)) { | |
906 | r = -ENOMEM; | |
907 | goto fail; | |
908 | } | |
909 | ||
910 | if (!first) | |
911 | ret[n++] = '.'; | |
912 | else | |
913 | first = false; | |
914 | ||
85818582 | 915 | memcpy(ret + n, t, r); |
74b2466e LP |
916 | n += r; |
917 | continue; | |
151226ab | 918 | } else if (allow_compression && (c & 0xc0) == 0xc0) { |
74b2466e LP |
919 | uint16_t ptr; |
920 | ||
921 | /* Pointer */ | |
922 | r = dns_packet_read_uint8(p, &d, NULL); | |
923 | if (r < 0) | |
924 | goto fail; | |
925 | ||
926 | ptr = (uint16_t) (c & ~0xc0) << 8 | (uint16_t) d; | |
927 | if (ptr < DNS_PACKET_HEADER_SIZE || ptr >= saved_rindex) { | |
928 | r = -EBADMSG; | |
929 | goto fail; | |
930 | } | |
931 | ||
932 | if (after_rindex == 0) | |
933 | after_rindex = p->rindex; | |
934 | ||
935 | p->rindex = ptr; | |
936 | } else | |
937 | goto fail; | |
938 | } | |
939 | ||
940 | if (!GREEDY_REALLOC(ret, allocated, n + 1)) { | |
941 | r = -ENOMEM; | |
942 | goto fail; | |
943 | } | |
944 | ||
945 | ret[n] = 0; | |
946 | ||
947 | if (after_rindex != 0) | |
948 | p->rindex= after_rindex; | |
949 | ||
950 | *_ret = ret; | |
951 | ret = NULL; | |
952 | ||
953 | if (start) | |
954 | *start = saved_rindex; | |
955 | ||
956 | return 0; | |
957 | ||
958 | fail: | |
959 | dns_packet_rewind(p, saved_rindex); | |
960 | return r; | |
961 | } | |
962 | ||
faa133f3 LP |
963 | int dns_packet_read_key(DnsPacket *p, DnsResourceKey **ret, size_t *start) { |
964 | _cleanup_free_ char *name = NULL; | |
965 | uint16_t class, type; | |
966 | DnsResourceKey *key; | |
74b2466e LP |
967 | size_t saved_rindex; |
968 | int r; | |
969 | ||
970 | assert(p); | |
971 | assert(ret); | |
972 | ||
973 | saved_rindex = p->rindex; | |
974 | ||
151226ab | 975 | r = dns_packet_read_name(p, &name, true, NULL); |
74b2466e LP |
976 | if (r < 0) |
977 | goto fail; | |
978 | ||
faa133f3 | 979 | r = dns_packet_read_uint16(p, &type, NULL); |
74b2466e LP |
980 | if (r < 0) |
981 | goto fail; | |
982 | ||
faa133f3 | 983 | r = dns_packet_read_uint16(p, &class, NULL); |
74b2466e LP |
984 | if (r < 0) |
985 | goto fail; | |
986 | ||
faa133f3 LP |
987 | key = dns_resource_key_new_consume(class, type, name); |
988 | if (!key) { | |
989 | r = -ENOMEM; | |
990 | goto fail; | |
991 | } | |
992 | ||
993 | name = NULL; | |
994 | *ret = key; | |
74b2466e LP |
995 | |
996 | if (start) | |
997 | *start = saved_rindex; | |
998 | ||
999 | return 0; | |
1000 | fail: | |
1001 | dns_packet_rewind(p, saved_rindex); | |
1002 | return r; | |
1003 | } | |
1004 | ||
8db0d2f5 ZJS |
1005 | static int dns_packet_read_public_key(DnsPacket *p, size_t length, |
1006 | void **dp, size_t *lengthp, | |
1007 | size_t *start) { | |
1008 | int r; | |
1009 | const void *d; | |
1010 | void *d2; | |
1011 | ||
1012 | r = dns_packet_read(p, length, &d, NULL); | |
1013 | if (r < 0) | |
1014 | return r; | |
1015 | ||
1016 | d2 = memdup(d, length); | |
1017 | if (!d2) | |
1018 | return -ENOMEM; | |
1019 | ||
1020 | *dp = d2; | |
1021 | *lengthp = length; | |
1022 | return 0; | |
1023 | } | |
1024 | ||
afbc4f26 ZJS |
1025 | static bool loc_size_ok(uint8_t size) { |
1026 | uint8_t m = size >> 4, e = size & 0xF; | |
1027 | ||
1028 | return m <= 9 && e <= 9 && (m > 0 || e == 0); | |
1029 | } | |
1030 | ||
8db0d2f5 | 1031 | static int dnskey_parse_flags(DnsResourceRecord *rr, uint16_t flags) { |
3ef77d04 LP |
1032 | assert(rr); |
1033 | ||
8db0d2f5 ZJS |
1034 | if (flags & ~(DNSKEY_FLAG_SEP | DNSKEY_FLAG_ZONE_KEY)) |
1035 | return -EBADMSG; | |
1036 | ||
1037 | rr->dnskey.zone_key_flag = flags & DNSKEY_FLAG_ZONE_KEY; | |
1038 | rr->dnskey.sep_flag = flags & DNSKEY_FLAG_SEP; | |
1039 | return 0; | |
1040 | } | |
1041 | ||
74b2466e | 1042 | int dns_packet_read_rr(DnsPacket *p, DnsResourceRecord **ret, size_t *start) { |
faa133f3 LP |
1043 | _cleanup_(dns_resource_record_unrefp) DnsResourceRecord *rr = NULL; |
1044 | _cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL; | |
74b2466e LP |
1045 | size_t saved_rindex, offset; |
1046 | uint16_t rdlength; | |
1047 | const void *d; | |
1048 | int r; | |
1049 | ||
1050 | assert(p); | |
1051 | assert(ret); | |
1052 | ||
4e0296a9 | 1053 | saved_rindex = p->rindex; |
74b2466e | 1054 | |
faa133f3 | 1055 | r = dns_packet_read_key(p, &key, NULL); |
74b2466e LP |
1056 | if (r < 0) |
1057 | goto fail; | |
1058 | ||
0e2bcd6a LP |
1059 | if (key->class == DNS_CLASS_ANY || |
1060 | key->type == DNS_TYPE_ANY) { | |
1061 | r = -EBADMSG; | |
1062 | goto fail; | |
1063 | } | |
1064 | ||
faa133f3 LP |
1065 | rr = dns_resource_record_new(key); |
1066 | if (!rr) { | |
1067 | r = -ENOMEM; | |
1068 | goto fail; | |
1069 | } | |
1070 | ||
74b2466e LP |
1071 | r = dns_packet_read_uint32(p, &rr->ttl, NULL); |
1072 | if (r < 0) | |
1073 | goto fail; | |
1074 | ||
1075 | r = dns_packet_read_uint16(p, &rdlength, NULL); | |
1076 | if (r < 0) | |
1077 | goto fail; | |
1078 | ||
1079 | if (p->rindex + rdlength > p->size) { | |
1080 | r = -EBADMSG; | |
1081 | goto fail; | |
1082 | } | |
1083 | ||
1084 | offset = p->rindex; | |
1085 | ||
faa133f3 | 1086 | switch (rr->key->type) { |
74b2466e | 1087 | |
9c92ce6d LP |
1088 | case DNS_TYPE_SRV: |
1089 | r = dns_packet_read_uint16(p, &rr->srv.priority, NULL); | |
1090 | if (r < 0) | |
1091 | goto fail; | |
1092 | r = dns_packet_read_uint16(p, &rr->srv.weight, NULL); | |
1093 | if (r < 0) | |
1094 | goto fail; | |
1095 | r = dns_packet_read_uint16(p, &rr->srv.port, NULL); | |
1096 | if (r < 0) | |
1097 | goto fail; | |
151226ab | 1098 | r = dns_packet_read_name(p, &rr->srv.name, true, NULL); |
9c92ce6d LP |
1099 | break; |
1100 | ||
74b2466e LP |
1101 | case DNS_TYPE_PTR: |
1102 | case DNS_TYPE_NS: | |
1103 | case DNS_TYPE_CNAME: | |
8ac4e9e1 | 1104 | case DNS_TYPE_DNAME: |
151226ab | 1105 | r = dns_packet_read_name(p, &rr->ptr.name, true, NULL); |
74b2466e LP |
1106 | break; |
1107 | ||
1108 | case DNS_TYPE_HINFO: | |
1109 | r = dns_packet_read_string(p, &rr->hinfo.cpu, NULL); | |
1110 | if (r < 0) | |
1111 | goto fail; | |
1112 | ||
1113 | r = dns_packet_read_string(p, &rr->hinfo.os, NULL); | |
1114 | break; | |
1115 | ||
9de3e329 | 1116 | case DNS_TYPE_SPF: /* exactly the same as TXT */ |
2e276efc ZJS |
1117 | case DNS_TYPE_TXT: { |
1118 | char *s; | |
1119 | ||
cbd67a86 | 1120 | while (p->rindex < offset + rdlength) { |
2e276efc ZJS |
1121 | r = dns_packet_read_string(p, &s, NULL); |
1122 | if (r < 0) | |
1123 | goto fail; | |
1124 | ||
1125 | r = strv_consume(&rr->txt.strings, s); | |
1126 | if (r < 0) | |
1127 | goto fail; | |
6a6fc3df LP |
1128 | } |
1129 | ||
1130 | r = 0; | |
2e276efc ZJS |
1131 | break; |
1132 | } | |
1133 | ||
74b2466e | 1134 | case DNS_TYPE_A: |
623a4c97 | 1135 | r = dns_packet_read_blob(p, &rr->a.in_addr, sizeof(struct in_addr), NULL); |
74b2466e LP |
1136 | break; |
1137 | ||
1138 | case DNS_TYPE_AAAA: | |
623a4c97 | 1139 | r = dns_packet_read_blob(p, &rr->aaaa.in6_addr, sizeof(struct in6_addr), NULL); |
74b2466e LP |
1140 | break; |
1141 | ||
7e8e0422 | 1142 | case DNS_TYPE_SOA: |
151226ab | 1143 | r = dns_packet_read_name(p, &rr->soa.mname, true, NULL); |
7e8e0422 LP |
1144 | if (r < 0) |
1145 | goto fail; | |
1146 | ||
151226ab | 1147 | r = dns_packet_read_name(p, &rr->soa.rname, true, NULL); |
7e8e0422 LP |
1148 | if (r < 0) |
1149 | goto fail; | |
1150 | ||
1151 | r = dns_packet_read_uint32(p, &rr->soa.serial, NULL); | |
1152 | if (r < 0) | |
1153 | goto fail; | |
1154 | ||
1155 | r = dns_packet_read_uint32(p, &rr->soa.refresh, NULL); | |
1156 | if (r < 0) | |
1157 | goto fail; | |
1158 | ||
1159 | r = dns_packet_read_uint32(p, &rr->soa.retry, NULL); | |
1160 | if (r < 0) | |
1161 | goto fail; | |
1162 | ||
1163 | r = dns_packet_read_uint32(p, &rr->soa.expire, NULL); | |
1164 | if (r < 0) | |
1165 | goto fail; | |
1166 | ||
1167 | r = dns_packet_read_uint32(p, &rr->soa.minimum, NULL); | |
1168 | break; | |
1169 | ||
623a4c97 | 1170 | case DNS_TYPE_MX: |
946c7094 ZJS |
1171 | r = dns_packet_read_uint16(p, &rr->mx.priority, NULL); |
1172 | if (r < 0) | |
1173 | goto fail; | |
1174 | ||
151226ab | 1175 | r = dns_packet_read_name(p, &rr->mx.exchange, true, NULL); |
946c7094 ZJS |
1176 | break; |
1177 | ||
0dae31d4 ZJS |
1178 | case DNS_TYPE_LOC: { |
1179 | uint8_t t; | |
1180 | size_t pos; | |
1181 | ||
1182 | r = dns_packet_read_uint8(p, &t, &pos); | |
1183 | if (r < 0) | |
1184 | goto fail; | |
1185 | ||
1186 | if (t == 0) { | |
1187 | rr->loc.version = t; | |
1188 | ||
1189 | r = dns_packet_read_uint8(p, &rr->loc.size, NULL); | |
1190 | if (r < 0) | |
1191 | goto fail; | |
1192 | ||
afbc4f26 ZJS |
1193 | if (!loc_size_ok(rr->loc.size)) { |
1194 | r = -EBADMSG; | |
1195 | goto fail; | |
1196 | } | |
1197 | ||
0dae31d4 ZJS |
1198 | r = dns_packet_read_uint8(p, &rr->loc.horiz_pre, NULL); |
1199 | if (r < 0) | |
1200 | goto fail; | |
1201 | ||
afbc4f26 ZJS |
1202 | if (!loc_size_ok(rr->loc.horiz_pre)) { |
1203 | r = -EBADMSG; | |
1204 | goto fail; | |
1205 | } | |
1206 | ||
0dae31d4 ZJS |
1207 | r = dns_packet_read_uint8(p, &rr->loc.vert_pre, NULL); |
1208 | if (r < 0) | |
1209 | goto fail; | |
1210 | ||
afbc4f26 ZJS |
1211 | if (!loc_size_ok(rr->loc.vert_pre)) { |
1212 | r = -EBADMSG; | |
1213 | goto fail; | |
1214 | } | |
1215 | ||
0dae31d4 ZJS |
1216 | r = dns_packet_read_uint32(p, &rr->loc.latitude, NULL); |
1217 | if (r < 0) | |
1218 | goto fail; | |
1219 | ||
1220 | r = dns_packet_read_uint32(p, &rr->loc.longitude, NULL); | |
1221 | if (r < 0) | |
1222 | goto fail; | |
1223 | ||
1224 | r = dns_packet_read_uint32(p, &rr->loc.altitude, NULL); | |
1225 | if (r < 0) | |
1226 | goto fail; | |
1227 | ||
1228 | break; | |
1229 | } else { | |
1230 | dns_packet_rewind(p, pos); | |
1231 | rr->unparseable = true; | |
afbc4f26 | 1232 | goto unparseable; |
0dae31d4 ZJS |
1233 | } |
1234 | } | |
1235 | ||
623a4c97 | 1236 | case DNS_TYPE_SSHFP: |
42cc2eeb LP |
1237 | r = dns_packet_read_uint8(p, &rr->sshfp.algorithm, NULL); |
1238 | if (r < 0) | |
1239 | goto fail; | |
1240 | ||
1241 | r = dns_packet_read_uint8(p, &rr->sshfp.fptype, NULL); | |
1242 | if (r < 0) | |
1243 | goto fail; | |
1244 | ||
8db0d2f5 ZJS |
1245 | r = dns_packet_read_public_key(p, rdlength - 2, |
1246 | &rr->sshfp.key, &rr->sshfp.key_size, | |
1247 | NULL); | |
1248 | break; | |
1249 | ||
1250 | case DNS_TYPE_DNSKEY: { | |
1251 | uint16_t flags; | |
1252 | uint8_t proto; | |
1253 | ||
1254 | r = dns_packet_read_uint16(p, &flags, NULL); | |
42cc2eeb LP |
1255 | if (r < 0) |
1256 | goto fail; | |
1257 | ||
8db0d2f5 ZJS |
1258 | r = dnskey_parse_flags(rr, flags); |
1259 | if (r < 0) | |
1260 | goto fail; | |
1261 | ||
1262 | r = dns_packet_read_uint8(p, &proto, NULL); | |
1263 | if (r < 0) | |
1264 | goto fail; | |
1265 | ||
1266 | /* protocol is required to be always 3 */ | |
1267 | if (proto != 3) { | |
1268 | r = -EBADMSG; | |
42cc2eeb LP |
1269 | goto fail; |
1270 | } | |
1271 | ||
8db0d2f5 ZJS |
1272 | r = dns_packet_read_uint8(p, &rr->dnskey.algorithm, NULL); |
1273 | if (r < 0) | |
1274 | goto fail; | |
1275 | ||
1276 | r = dns_packet_read_public_key(p, rdlength - 4, | |
1277 | &rr->dnskey.key, &rr->dnskey.key_size, | |
1278 | NULL); | |
42cc2eeb | 1279 | break; |
8db0d2f5 | 1280 | } |
42cc2eeb | 1281 | |
151226ab ZJS |
1282 | case DNS_TYPE_RRSIG: |
1283 | r = dns_packet_read_uint16(p, &rr->rrsig.type_covered, NULL); | |
1284 | if (r < 0) | |
1285 | goto fail; | |
1286 | ||
1287 | r = dns_packet_read_uint8(p, &rr->rrsig.algorithm, NULL); | |
1288 | if (r < 0) | |
1289 | goto fail; | |
1290 | ||
1291 | r = dns_packet_read_uint8(p, &rr->rrsig.labels, NULL); | |
1292 | if (r < 0) | |
1293 | goto fail; | |
1294 | ||
1295 | r = dns_packet_read_uint32(p, &rr->rrsig.original_ttl, NULL); | |
1296 | if (r < 0) | |
1297 | goto fail; | |
1298 | ||
1299 | r = dns_packet_read_uint32(p, &rr->rrsig.expiration, NULL); | |
1300 | if (r < 0) | |
1301 | goto fail; | |
1302 | ||
1303 | r = dns_packet_read_uint32(p, &rr->rrsig.inception, NULL); | |
1304 | if (r < 0) | |
1305 | goto fail; | |
1306 | ||
1307 | r = dns_packet_read_uint16(p, &rr->rrsig.key_tag, NULL); | |
1308 | if (r < 0) | |
1309 | goto fail; | |
1310 | ||
1311 | r = dns_packet_read_name(p, &rr->rrsig.signer, false, NULL); | |
1312 | if (r < 0) | |
1313 | goto fail; | |
1314 | ||
1315 | r = dns_packet_read_public_key(p, offset + rdlength - p->rindex, | |
1316 | &rr->rrsig.signature, &rr->rrsig.signature_size, | |
1317 | NULL); | |
1318 | break; | |
1319 | ||
74b2466e | 1320 | default: |
afbc4f26 | 1321 | unparseable: |
74b2466e LP |
1322 | r = dns_packet_read(p, rdlength, &d, NULL); |
1323 | if (r < 0) | |
1324 | goto fail; | |
1325 | ||
1326 | rr->generic.data = memdup(d, rdlength); | |
1327 | if (!rr->generic.data) { | |
1328 | r = -ENOMEM; | |
1329 | goto fail; | |
1330 | } | |
1331 | ||
1332 | rr->generic.size = rdlength; | |
1333 | break; | |
1334 | } | |
1335 | if (r < 0) | |
1336 | goto fail; | |
1337 | if (p->rindex != offset + rdlength) { | |
1338 | r = -EBADMSG; | |
1339 | goto fail; | |
1340 | } | |
1341 | ||
1342 | *ret = rr; | |
1343 | rr = NULL; | |
1344 | ||
1345 | if (start) | |
1346 | *start = saved_rindex; | |
1347 | ||
1348 | return 0; | |
1349 | fail: | |
1350 | dns_packet_rewind(p, saved_rindex); | |
1351 | return r; | |
1352 | } | |
1353 | ||
faa133f3 LP |
1354 | int dns_packet_extract(DnsPacket *p) { |
1355 | _cleanup_(dns_question_unrefp) DnsQuestion *question = NULL; | |
1356 | _cleanup_(dns_answer_unrefp) DnsAnswer *answer = NULL; | |
1357 | size_t saved_rindex; | |
1358 | unsigned n, i; | |
74b2466e LP |
1359 | int r; |
1360 | ||
a4076574 LP |
1361 | if (p->extracted) |
1362 | return 0; | |
1363 | ||
faa133f3 | 1364 | saved_rindex = p->rindex; |
322345fd LP |
1365 | dns_packet_rewind(p, DNS_PACKET_HEADER_SIZE); |
1366 | ||
3cb10d3a | 1367 | n = DNS_PACKET_QDCOUNT(p); |
faa133f3 LP |
1368 | if (n > 0) { |
1369 | question = dns_question_new(n); | |
1370 | if (!question) { | |
1371 | r = -ENOMEM; | |
1372 | goto finish; | |
1373 | } | |
74b2466e | 1374 | |
faa133f3 LP |
1375 | for (i = 0; i < n; i++) { |
1376 | _cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL; | |
74b2466e | 1377 | |
faa133f3 LP |
1378 | r = dns_packet_read_key(p, &key, NULL); |
1379 | if (r < 0) | |
1380 | goto finish; | |
74b2466e | 1381 | |
faa133f3 LP |
1382 | r = dns_question_add(question, key); |
1383 | if (r < 0) | |
1384 | goto finish; | |
1385 | } | |
1386 | } | |
322345fd | 1387 | |
faa133f3 LP |
1388 | n = DNS_PACKET_RRCOUNT(p); |
1389 | if (n > 0) { | |
1390 | answer = dns_answer_new(n); | |
1391 | if (!answer) { | |
1392 | r = -ENOMEM; | |
1393 | goto finish; | |
1394 | } | |
322345fd | 1395 | |
faa133f3 LP |
1396 | for (i = 0; i < n; i++) { |
1397 | _cleanup_(dns_resource_record_unrefp) DnsResourceRecord *rr = NULL; | |
322345fd | 1398 | |
faa133f3 LP |
1399 | r = dns_packet_read_rr(p, &rr, NULL); |
1400 | if (r < 0) | |
1401 | goto finish; | |
322345fd | 1402 | |
faa133f3 LP |
1403 | r = dns_answer_add(answer, rr); |
1404 | if (r < 0) | |
1405 | goto finish; | |
1406 | } | |
322345fd LP |
1407 | } |
1408 | ||
faa133f3 LP |
1409 | p->question = question; |
1410 | question = NULL; | |
322345fd | 1411 | |
faa133f3 LP |
1412 | p->answer = answer; |
1413 | answer = NULL; | |
322345fd | 1414 | |
a4076574 LP |
1415 | p->extracted = true; |
1416 | ||
faa133f3 | 1417 | r = 0; |
322345fd LP |
1418 | |
1419 | finish: | |
1420 | p->rindex = saved_rindex; | |
1421 | return r; | |
1422 | } | |
1423 | ||
74b2466e LP |
1424 | static const char* const dns_rcode_table[_DNS_RCODE_MAX_DEFINED] = { |
1425 | [DNS_RCODE_SUCCESS] = "SUCCESS", | |
1426 | [DNS_RCODE_FORMERR] = "FORMERR", | |
1427 | [DNS_RCODE_SERVFAIL] = "SERVFAIL", | |
1428 | [DNS_RCODE_NXDOMAIN] = "NXDOMAIN", | |
1429 | [DNS_RCODE_NOTIMP] = "NOTIMP", | |
1430 | [DNS_RCODE_REFUSED] = "REFUSED", | |
1431 | [DNS_RCODE_YXDOMAIN] = "YXDOMAIN", | |
1432 | [DNS_RCODE_YXRRSET] = "YRRSET", | |
1433 | [DNS_RCODE_NXRRSET] = "NXRRSET", | |
1434 | [DNS_RCODE_NOTAUTH] = "NOTAUTH", | |
1435 | [DNS_RCODE_NOTZONE] = "NOTZONE", | |
1436 | [DNS_RCODE_BADVERS] = "BADVERS", | |
1437 | [DNS_RCODE_BADKEY] = "BADKEY", | |
1438 | [DNS_RCODE_BADTIME] = "BADTIME", | |
1439 | [DNS_RCODE_BADMODE] = "BADMODE", | |
1440 | [DNS_RCODE_BADNAME] = "BADNAME", | |
1441 | [DNS_RCODE_BADALG] = "BADALG", | |
1442 | [DNS_RCODE_BADTRUNC] = "BADTRUNC", | |
1443 | }; | |
1444 | DEFINE_STRING_TABLE_LOOKUP(dns_rcode, int); | |
1716f6dc LP |
1445 | |
1446 | static const char* const dns_protocol_table[_DNS_PROTOCOL_MAX] = { | |
1447 | [DNS_PROTOCOL_DNS] = "dns", | |
1448 | [DNS_PROTOCOL_MDNS] = "mdns", | |
1449 | [DNS_PROTOCOL_LLMNR] = "llmnr", | |
1450 | }; | |
1451 | DEFINE_STRING_TABLE_LOOKUP(dns_protocol, DnsProtocol); | |
ff3d6560 ZJS |
1452 | |
1453 | static const char* const dnssec_algorithm_table[_DNSSEC_ALGORITHM_MAX_DEFINED] = { | |
1454 | [DNSSEC_ALGORITHM_RSAMD5] = "RSAMD5", | |
1455 | [DNSSEC_ALGORITHM_DH] = "DH", | |
1456 | [DNSSEC_ALGORITHM_DSA] = "DSA", | |
1457 | [DNSSEC_ALGORITHM_ECC] = "ECC", | |
1458 | [DNSSEC_ALGORITHM_RSASHA1] = "RSASHA1", | |
1459 | [DNSSEC_ALGORITHM_INDIRECT] = "INDIRECT", | |
1460 | [DNSSEC_ALGORITHM_PRIVATEDNS] = "PRIVATEDNS", | |
1461 | [DNSSEC_ALGORITHM_PRIVATEOID] = "PRIVATEOID", | |
1462 | }; | |
1463 | DEFINE_STRING_TABLE_LOOKUP(dnssec_algorithm, int); |