]>
Commit | Line | Data |
---|---|---|
db9ecf05 | 1 | /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
74b2466e | 2 | |
b5efdb8a | 3 | #include "alloc-util.h" |
284d7641 | 4 | #include "bitmap.h" |
4ad7f276 | 5 | #include "dns-domain.h" |
ac684446 | 6 | #include "escape.h" |
93a1f792 | 7 | #include "log.h" |
0a970718 | 8 | #include "memory-util.h" |
68527d30 | 9 | #include "resolved-dns-answer.h" |
74b2466e | 10 | #include "resolved-dns-packet.h" |
68527d30 DDM |
11 | #include "resolved-dns-question.h" |
12 | #include "resolved-dns-rr.h" | |
2d34cf0c | 13 | #include "set.h" |
284d7641 | 14 | #include "siphash24.h" |
0d609349 | 15 | #include "stdio-util.h" |
8b43440b | 16 | #include "string-table.h" |
284d7641 DDM |
17 | #include "string-util.h" |
18 | #include "time-util.h" | |
8b43440b LP |
19 | #include "unaligned.h" |
20 | #include "utf8.h" | |
74b2466e | 21 | |
7586f4d1 TG |
22 | #define EDNS0_OPT_DO (1<<15) |
23 | ||
ab1a1ba5 | 24 | assert_cc(DNS_PACKET_SIZE_START > DNS_PACKET_HEADER_SIZE); |
88795538 | 25 | |
e18a3c73 ZJS |
26 | typedef struct DnsPacketRewinder { |
27 | DnsPacket *packet; | |
28 | size_t saved_rindex; | |
29 | } DnsPacketRewinder; | |
30 | ||
31 | static void rewind_dns_packet(DnsPacketRewinder *rewinder) { | |
32 | if (rewinder->packet) | |
33 | dns_packet_rewind(rewinder->packet, rewinder->saved_rindex); | |
34 | } | |
35 | ||
0c4f37f0 ZJS |
36 | #define REWINDER_INIT(p) { \ |
37 | .packet = (p), \ | |
38 | .saved_rindex = (p)->rindex, \ | |
39 | } | |
40 | #define CANCEL_REWINDER(rewinder) do { (rewinder).packet = NULL; } while (0) | |
e18a3c73 | 41 | |
834dc383 DDM |
42 | uint16_t dns_packet_rcode(DnsPacket *p) { |
43 | uint16_t rcode; | |
44 | ||
45 | assert(p); | |
46 | ||
47 | if (p->opt) | |
48 | rcode = (uint16_t) ((p->opt->ttl >> 20) & 0xFF0); | |
49 | else | |
50 | rcode = 0; | |
51 | ||
52 | return rcode | (be16toh(DNS_PACKET_HEADER(p)->flags) & 0xF); | |
53 | }; | |
54 | ||
55 | uint16_t dns_packet_payload_size_max(DnsPacket *p) { | |
56 | assert(p); | |
57 | ||
58 | /* Returns the advertised maximum size for replies, or the DNS default if there's nothing defined. */ | |
59 | ||
60 | if (p->ipproto == IPPROTO_TCP) /* we ignore EDNS(0) size data on TCP, like everybody else */ | |
61 | return DNS_PACKET_SIZE_MAX; | |
62 | ||
63 | if (p->opt) | |
64 | return MAX(DNS_PACKET_UNICAST_SIZE_MAX, p->opt->key->class); | |
65 | ||
66 | return DNS_PACKET_UNICAST_SIZE_MAX; | |
67 | } | |
68 | ||
69 | bool dns_packet_do(DnsPacket *p) { | |
70 | assert(p); | |
71 | ||
72 | if (!p->opt) | |
73 | return false; | |
74 | ||
75 | return !!(p->opt->ttl & (1U << 15)); | |
76 | } | |
77 | ||
78 | bool dns_packet_version_supported(DnsPacket *p) { | |
79 | assert(p); | |
80 | ||
81 | /* Returns true if this packet is in a version we support. Which means either non-EDNS or EDNS(0), but not EDNS | |
82 | * of any newer versions */ | |
83 | ||
84 | if (!p->opt) | |
85 | return true; | |
86 | ||
87 | return DNS_RESOURCE_RECORD_OPT_VERSION_SUPPORTED(p->opt); | |
88 | } | |
89 | ||
51027656 LP |
90 | int dns_packet_new( |
91 | DnsPacket **ret, | |
92 | DnsProtocol protocol, | |
93 | size_t min_alloc_dsize, | |
94 | size_t max_size) { | |
95 | ||
74b2466e LP |
96 | DnsPacket *p; |
97 | size_t a; | |
98 | ||
99 | assert(ret); | |
51027656 LP |
100 | assert(max_size >= DNS_PACKET_HEADER_SIZE); |
101 | ||
102 | if (max_size > DNS_PACKET_SIZE_MAX) | |
103 | max_size = DNS_PACKET_SIZE_MAX; | |
74b2466e | 104 | |
46a58596 BR |
105 | /* The caller may not check what is going to be truly allocated, so do not allow to |
106 | * allocate a DNS packet bigger than DNS_PACKET_SIZE_MAX. | |
107 | */ | |
baaa35ad ZJS |
108 | if (min_alloc_dsize > DNS_PACKET_SIZE_MAX) |
109 | return log_error_errno(SYNTHETIC_ERRNO(EFBIG), | |
110 | "Requested packet data size too big: %zu", | |
111 | min_alloc_dsize); | |
46a58596 BR |
112 | |
113 | /* When dns_packet_new() is called with min_alloc_dsize == 0, allocate more than the | |
88795538 ZJS |
114 | * absolute minimum (which is the dns packet header size), to avoid |
115 | * resizing immediately again after appending the first data to the packet. | |
116 | */ | |
46a58596 | 117 | if (min_alloc_dsize < DNS_PACKET_HEADER_SIZE) |
88795538 ZJS |
118 | a = DNS_PACKET_SIZE_START; |
119 | else | |
46a58596 | 120 | a = min_alloc_dsize; |
74b2466e | 121 | |
c73ce96b LP |
122 | /* round up to next page size */ |
123 | a = PAGE_ALIGN(ALIGN(sizeof(DnsPacket)) + a) - ALIGN(sizeof(DnsPacket)); | |
124 | ||
125 | /* make sure we never allocate more than useful */ | |
51027656 LP |
126 | if (a > max_size) |
127 | a = max_size; | |
c73ce96b | 128 | |
74b2466e LP |
129 | p = malloc0(ALIGN(sizeof(DnsPacket)) + a); |
130 | if (!p) | |
131 | return -ENOMEM; | |
132 | ||
1ed31408 LP |
133 | *p = (DnsPacket) { |
134 | .n_ref = 1, | |
135 | .protocol = protocol, | |
136 | .size = DNS_PACKET_HEADER_SIZE, | |
137 | .rindex = DNS_PACKET_HEADER_SIZE, | |
138 | .allocated = a, | |
139 | .max_size = max_size, | |
f5fbe71d YW |
140 | .opt_start = SIZE_MAX, |
141 | .opt_size = SIZE_MAX, | |
1ed31408 | 142 | }; |
74b2466e LP |
143 | |
144 | *ret = p; | |
145 | ||
146 | return 0; | |
147 | } | |
148 | ||
dbfbb6e7 | 149 | void dns_packet_set_flags(DnsPacket *p, bool dnssec_checking_disabled, bool truncated) { |
74b2466e | 150 | |
dbfbb6e7 | 151 | DnsPacketHeader *h; |
74b2466e | 152 | |
dbfbb6e7 | 153 | assert(p); |
74b2466e LP |
154 | |
155 | h = DNS_PACKET_HEADER(p); | |
1716f6dc | 156 | |
79893116 | 157 | switch (p->protocol) { |
dbfbb6e7 DM |
158 | case DNS_PROTOCOL_LLMNR: |
159 | assert(!truncated); | |
160 | ||
069360a6 LP |
161 | h->flags = htobe16(DNS_PACKET_MAKE_FLAGS(0 /* qr */, |
162 | 0 /* opcode */, | |
163 | 0 /* c */, | |
e5abebab | 164 | 0 /* tc */, |
069360a6 LP |
165 | 0 /* t */, |
166 | 0 /* ra */, | |
167 | 0 /* ad */, | |
168 | 0 /* cd */, | |
169 | 0 /* rcode */)); | |
dbfbb6e7 DM |
170 | break; |
171 | ||
172 | case DNS_PROTOCOL_MDNS: | |
173 | h->flags = htobe16(DNS_PACKET_MAKE_FLAGS(0 /* qr */, | |
174 | 0 /* opcode */, | |
175 | 0 /* aa */, | |
176 | truncated /* tc */, | |
177 | 0 /* rd (ask for recursion) */, | |
178 | 0 /* ra */, | |
179 | 0 /* ad */, | |
180 | 0 /* cd */, | |
181 | 0 /* rcode */)); | |
182 | break; | |
183 | ||
184 | default: | |
185 | assert(!truncated); | |
186 | ||
069360a6 LP |
187 | h->flags = htobe16(DNS_PACKET_MAKE_FLAGS(0 /* qr */, |
188 | 0 /* opcode */, | |
189 | 0 /* aa */, | |
190 | 0 /* tc */, | |
191 | 1 /* rd (ask for recursion) */, | |
192 | 0 /* ra */, | |
193 | 0 /* ad */, | |
24710c48 | 194 | dnssec_checking_disabled /* cd */, |
069360a6 | 195 | 0 /* rcode */)); |
dbfbb6e7 DM |
196 | } |
197 | } | |
198 | ||
46a58596 | 199 | int dns_packet_new_query(DnsPacket **ret, DnsProtocol protocol, size_t min_alloc_dsize, bool dnssec_checking_disabled) { |
dbfbb6e7 DM |
200 | DnsPacket *p; |
201 | int r; | |
202 | ||
203 | assert(ret); | |
204 | ||
51027656 | 205 | r = dns_packet_new(&p, protocol, min_alloc_dsize, DNS_PACKET_SIZE_MAX); |
dbfbb6e7 DM |
206 | if (r < 0) |
207 | return r; | |
208 | ||
209 | /* Always set the TC bit to 0 initially. | |
210 | * If there are multiple packets later, we'll update the bit shortly before sending. | |
211 | */ | |
212 | dns_packet_set_flags(p, dnssec_checking_disabled, false); | |
74b2466e LP |
213 | |
214 | *ret = p; | |
215 | return 0; | |
216 | } | |
217 | ||
1a6cd020 LP |
218 | int dns_packet_dup(DnsPacket **ret, DnsPacket *p) { |
219 | DnsPacket *c; | |
220 | int r; | |
221 | ||
222 | assert(ret); | |
223 | assert(p); | |
224 | ||
225 | r = dns_packet_validate(p); | |
226 | if (r < 0) | |
227 | return r; | |
228 | ||
229 | c = malloc(ALIGN(sizeof(DnsPacket)) + p->size); | |
230 | if (!c) | |
231 | return -ENOMEM; | |
232 | ||
233 | *c = (DnsPacket) { | |
234 | .n_ref = 1, | |
235 | .protocol = p->protocol, | |
236 | .size = p->size, | |
237 | .rindex = DNS_PACKET_HEADER_SIZE, | |
238 | .allocated = p->size, | |
239 | .max_size = p->max_size, | |
f5fbe71d YW |
240 | .opt_start = SIZE_MAX, |
241 | .opt_size = SIZE_MAX, | |
1a6cd020 LP |
242 | }; |
243 | ||
244 | memcpy(DNS_PACKET_DATA(c), DNS_PACKET_DATA(p), p->size); | |
245 | ||
246 | *ret = c; | |
247 | return 0; | |
248 | } | |
249 | ||
74b2466e LP |
250 | DnsPacket *dns_packet_ref(DnsPacket *p) { |
251 | ||
252 | if (!p) | |
253 | return NULL; | |
254 | ||
a8812dd7 LP |
255 | assert(!p->on_stack); |
256 | ||
74b2466e LP |
257 | assert(p->n_ref > 0); |
258 | p->n_ref++; | |
259 | return p; | |
260 | } | |
261 | ||
262 | static void dns_packet_free(DnsPacket *p) { | |
263 | char *s; | |
264 | ||
265 | assert(p); | |
266 | ||
faa133f3 LP |
267 | dns_question_unref(p->question); |
268 | dns_answer_unref(p->answer); | |
d75acfb0 | 269 | dns_resource_record_unref(p->opt); |
322345fd | 270 | |
74b2466e LP |
271 | while ((s = hashmap_steal_first_key(p->names))) |
272 | free(s); | |
273 | hashmap_free(p->names); | |
274 | ||
faa133f3 | 275 | free(p->_data); |
a8812dd7 LP |
276 | |
277 | if (!p->on_stack) | |
278 | free(p); | |
74b2466e LP |
279 | } |
280 | ||
281 | DnsPacket *dns_packet_unref(DnsPacket *p) { | |
282 | if (!p) | |
283 | return NULL; | |
284 | ||
285 | assert(p->n_ref > 0); | |
286 | ||
6728a58d | 287 | dns_packet_unref(p->more); |
9c491563 | 288 | |
74b2466e LP |
289 | if (p->n_ref == 1) |
290 | dns_packet_free(p); | |
291 | else | |
292 | p->n_ref--; | |
293 | ||
294 | return NULL; | |
295 | } | |
296 | ||
297 | int dns_packet_validate(DnsPacket *p) { | |
298 | assert(p); | |
299 | ||
300 | if (p->size < DNS_PACKET_HEADER_SIZE) | |
301 | return -EBADMSG; | |
302 | ||
c73ce96b LP |
303 | if (p->size > DNS_PACKET_SIZE_MAX) |
304 | return -EBADMSG; | |
305 | ||
623a4c97 | 306 | return 1; |
74b2466e LP |
307 | } |
308 | ||
309 | int dns_packet_validate_reply(DnsPacket *p) { | |
74b2466e LP |
310 | int r; |
311 | ||
312 | assert(p); | |
313 | ||
314 | r = dns_packet_validate(p); | |
315 | if (r < 0) | |
316 | return r; | |
317 | ||
623a4c97 LP |
318 | if (DNS_PACKET_QR(p) != 1) |
319 | return 0; | |
320 | ||
321 | if (DNS_PACKET_OPCODE(p) != 0) | |
74b2466e LP |
322 | return -EBADMSG; |
323 | ||
818ef443 | 324 | switch (p->protocol) { |
d75acfb0 | 325 | |
818ef443 DM |
326 | case DNS_PROTOCOL_LLMNR: |
327 | /* RFC 4795, Section 2.1.1. says to discard all replies with QDCOUNT != 1 */ | |
328 | if (DNS_PACKET_QDCOUNT(p) != 1) | |
329 | return -EBADMSG; | |
330 | ||
331 | break; | |
332 | ||
4e5bf5e1 DM |
333 | case DNS_PROTOCOL_MDNS: |
334 | /* RFC 6762, Section 18 */ | |
834dc383 | 335 | if (dns_packet_rcode(p) != 0) |
4e5bf5e1 DM |
336 | return -EBADMSG; |
337 | ||
338 | break; | |
339 | ||
818ef443 | 340 | default: |
5c9feb2d | 341 | ; |
818ef443 | 342 | } |
ea917db9 | 343 | |
623a4c97 LP |
344 | return 1; |
345 | } | |
346 | ||
347 | int dns_packet_validate_query(DnsPacket *p) { | |
348 | int r; | |
349 | ||
350 | assert(p); | |
351 | ||
352 | r = dns_packet_validate(p); | |
353 | if (r < 0) | |
354 | return r; | |
355 | ||
356 | if (DNS_PACKET_QR(p) != 0) | |
357 | return 0; | |
358 | ||
3cb10d3a | 359 | if (DNS_PACKET_OPCODE(p) != 0) |
74b2466e LP |
360 | return -EBADMSG; |
361 | ||
818ef443 | 362 | switch (p->protocol) { |
d75acfb0 | 363 | |
b30bf55d | 364 | case DNS_PROTOCOL_DNS: |
ba1749f6 YW |
365 | if (DNS_PACKET_TC(p)) |
366 | return -EBADMSG; | |
367 | ||
368 | if (DNS_PACKET_QDCOUNT(p) != 1) | |
369 | return -EBADMSG; | |
370 | ||
371 | if (DNS_PACKET_ANCOUNT(p) > 0) | |
372 | return -EBADMSG; | |
373 | ||
374 | /* Note, in most cases, DNS query packet does not have authority section. But some query | |
375 | * types, e.g. IXFR, have Authority sections. Hence, unlike the check for LLMNR, we do not | |
376 | * check DNS_PACKET_NSCOUNT(p) here. */ | |
377 | break; | |
378 | ||
379 | case DNS_PROTOCOL_LLMNR: | |
380 | if (DNS_PACKET_TC(p)) | |
6f087266 YW |
381 | return -EBADMSG; |
382 | ||
818ef443 DM |
383 | /* RFC 4795, Section 2.1.1. says to discard all queries with QDCOUNT != 1 */ |
384 | if (DNS_PACKET_QDCOUNT(p) != 1) | |
385 | return -EBADMSG; | |
623a4c97 | 386 | |
818ef443 DM |
387 | /* RFC 4795, Section 2.1.1. says to discard all queries with ANCOUNT != 0 */ |
388 | if (DNS_PACKET_ANCOUNT(p) > 0) | |
389 | return -EBADMSG; | |
623a4c97 | 390 | |
818ef443 DM |
391 | /* RFC 4795, Section 2.1.1. says to discard all queries with NSCOUNT != 0 */ |
392 | if (DNS_PACKET_NSCOUNT(p) > 0) | |
393 | return -EBADMSG; | |
394 | ||
395 | break; | |
396 | ||
4e5bf5e1 | 397 | case DNS_PROTOCOL_MDNS: |
ba1749f6 YW |
398 | /* Note, mDNS query may have truncation flag. So, unlike the check for DNS and LLMNR, |
399 | * we do not check DNS_PACKET_TC(p) here. */ | |
400 | ||
2aaf3765 SB |
401 | /* RFC 6762, Section 18 specifies that messages with non-zero RCODE |
402 | * must be silently ignored, and that we must ignore the values of | |
403 | * AA, RD, RA, AD, and CD bits. */ | |
834dc383 | 404 | if (dns_packet_rcode(p) != 0) |
4e5bf5e1 DM |
405 | return -EBADMSG; |
406 | ||
407 | break; | |
408 | ||
818ef443 | 409 | default: |
5c9feb2d | 410 | ; |
818ef443 | 411 | } |
623a4c97 LP |
412 | |
413 | return 1; | |
74b2466e LP |
414 | } |
415 | ||
416 | static int dns_packet_extend(DnsPacket *p, size_t add, void **ret, size_t *start) { | |
417 | assert(p); | |
418 | ||
c73ce96b | 419 | if (p->size + add > p->allocated) { |
51027656 | 420 | size_t a, ms; |
c73ce96b LP |
421 | |
422 | a = PAGE_ALIGN((p->size + add) * 2); | |
51027656 LP |
423 | |
424 | ms = dns_packet_size_max(p); | |
425 | if (a > ms) | |
426 | a = ms; | |
c73ce96b LP |
427 | |
428 | if (p->size + add > a) | |
429 | return -EMSGSIZE; | |
430 | ||
faa133f3 | 431 | if (p->_data) { |
c73ce96b LP |
432 | void *d; |
433 | ||
faa133f3 | 434 | d = realloc(p->_data, a); |
c73ce96b LP |
435 | if (!d) |
436 | return -ENOMEM; | |
437 | ||
faa133f3 | 438 | p->_data = d; |
c73ce96b | 439 | } else { |
faa133f3 LP |
440 | p->_data = malloc(a); |
441 | if (!p->_data) | |
c73ce96b LP |
442 | return -ENOMEM; |
443 | ||
faa133f3 LP |
444 | memcpy(p->_data, (uint8_t*) p + ALIGN(sizeof(DnsPacket)), p->size); |
445 | memzero((uint8_t*) p->_data + p->size, a - p->size); | |
c73ce96b LP |
446 | } |
447 | ||
448 | p->allocated = a; | |
449 | } | |
74b2466e LP |
450 | |
451 | if (start) | |
452 | *start = p->size; | |
453 | ||
454 | if (ret) | |
455 | *ret = (uint8_t*) DNS_PACKET_DATA(p) + p->size; | |
456 | ||
457 | p->size += add; | |
458 | return 0; | |
459 | } | |
460 | ||
9c5e12a4 | 461 | void dns_packet_truncate(DnsPacket *p, size_t sz) { |
74b2466e LP |
462 | char *s; |
463 | void *n; | |
464 | ||
465 | assert(p); | |
466 | ||
467 | if (p->size <= sz) | |
468 | return; | |
469 | ||
90e74a66 | 470 | HASHMAP_FOREACH_KEY(n, s, p->names) { |
74b2466e LP |
471 | |
472 | if (PTR_TO_SIZE(n) < sz) | |
473 | continue; | |
474 | ||
475 | hashmap_remove(p->names, s); | |
476 | free(s); | |
477 | } | |
478 | ||
479 | p->size = sz; | |
480 | } | |
481 | ||
623a4c97 LP |
482 | int dns_packet_append_blob(DnsPacket *p, const void *d, size_t l, size_t *start) { |
483 | void *q; | |
484 | int r; | |
485 | ||
486 | assert(p); | |
487 | ||
488 | r = dns_packet_extend(p, l, &q, start); | |
489 | if (r < 0) | |
490 | return r; | |
491 | ||
1f66559c | 492 | memcpy_safe(q, d, l); |
623a4c97 LP |
493 | return 0; |
494 | } | |
495 | ||
74b2466e LP |
496 | int dns_packet_append_uint8(DnsPacket *p, uint8_t v, size_t *start) { |
497 | void *d; | |
498 | int r; | |
499 | ||
500 | assert(p); | |
501 | ||
502 | r = dns_packet_extend(p, sizeof(uint8_t), &d, start); | |
503 | if (r < 0) | |
504 | return r; | |
505 | ||
506 | ((uint8_t*) d)[0] = v; | |
507 | ||
508 | return 0; | |
509 | } | |
510 | ||
511 | int dns_packet_append_uint16(DnsPacket *p, uint16_t v, size_t *start) { | |
512 | void *d; | |
513 | int r; | |
514 | ||
515 | assert(p); | |
516 | ||
517 | r = dns_packet_extend(p, sizeof(uint16_t), &d, start); | |
518 | if (r < 0) | |
519 | return r; | |
520 | ||
725ca0e5 | 521 | unaligned_write_be16(d, v); |
623a4c97 LP |
522 | |
523 | return 0; | |
524 | } | |
525 | ||
526 | int dns_packet_append_uint32(DnsPacket *p, uint32_t v, size_t *start) { | |
527 | void *d; | |
528 | int r; | |
529 | ||
530 | assert(p); | |
531 | ||
532 | r = dns_packet_extend(p, sizeof(uint32_t), &d, start); | |
533 | if (r < 0) | |
534 | return r; | |
535 | ||
725ca0e5 | 536 | unaligned_write_be32(d, v); |
74b2466e LP |
537 | |
538 | return 0; | |
539 | } | |
540 | ||
541 | int dns_packet_append_string(DnsPacket *p, const char *s, size_t *start) { | |
74b2466e LP |
542 | assert(p); |
543 | assert(s); | |
544 | ||
c38a52da | 545 | return dns_packet_append_raw_string(p, s, strlen(s), start); |
74b2466e LP |
546 | } |
547 | ||
2001c805 LP |
548 | int dns_packet_append_raw_string(DnsPacket *p, const void *s, size_t size, size_t *start) { |
549 | void *d; | |
550 | int r; | |
551 | ||
552 | assert(p); | |
553 | assert(s || size == 0); | |
554 | ||
555 | if (size > 255) | |
556 | return -E2BIG; | |
557 | ||
558 | r = dns_packet_extend(p, 1 + size, &d, start); | |
559 | if (r < 0) | |
560 | return r; | |
561 | ||
562 | ((uint8_t*) d)[0] = (uint8_t) size; | |
563 | ||
75f32f04 | 564 | memcpy_safe(((uint8_t*) d) + 1, s, size); |
2001c805 LP |
565 | |
566 | return 0; | |
567 | } | |
568 | ||
a3db237b | 569 | int dns_packet_append_label(DnsPacket *p, const char *d, size_t l, bool canonical_candidate, size_t *start) { |
a8812dd7 | 570 | uint8_t *w; |
74b2466e LP |
571 | int r; |
572 | ||
a3db237b LP |
573 | /* Append a label to a packet. Optionally, does this in DNSSEC |
574 | * canonical form, if this label is marked as a candidate for | |
575 | * it, and the canonical form logic is enabled for the | |
576 | * packet */ | |
577 | ||
74b2466e LP |
578 | assert(p); |
579 | assert(d); | |
580 | ||
581 | if (l > DNS_LABEL_MAX) | |
582 | return -E2BIG; | |
583 | ||
a8812dd7 | 584 | r = dns_packet_extend(p, 1 + l, (void**) &w, start); |
74b2466e LP |
585 | if (r < 0) |
586 | return r; | |
587 | ||
a8812dd7 LP |
588 | *(w++) = (uint8_t) l; |
589 | ||
64ea42e9 | 590 | if (p->canonical_form && canonical_candidate) |
a8812dd7 LP |
591 | /* Generate in canonical form, as defined by DNSSEC |
592 | * RFC 4034, Section 6.2, i.e. all lower-case. */ | |
64ea42e9 | 593 | for (size_t i = 0; i < l; i++) |
b577e3d5 | 594 | w[i] = (uint8_t) ascii_tolower(d[i]); |
64ea42e9 | 595 | else |
a8812dd7 LP |
596 | /* Otherwise, just copy the string unaltered. This is |
597 | * essential for DNS-SD, where the casing of labels | |
598 | * matters and needs to be retained. */ | |
599 | memcpy(w, d, l); | |
74b2466e LP |
600 | |
601 | return 0; | |
602 | } | |
603 | ||
f6a5fec6 LP |
604 | int dns_packet_append_name( |
605 | DnsPacket *p, | |
606 | const char *name, | |
607 | bool allow_compression, | |
a3db237b | 608 | bool canonical_candidate, |
f6a5fec6 LP |
609 | size_t *start) { |
610 | ||
360105f1 LP |
611 | _cleanup_free_ char **added_entries = NULL; /* doesn't own the strings! this is just regular pointer array, not a NULL-terminated strv! */ |
612 | size_t n_added_entries = 0, saved_size; | |
74b2466e LP |
613 | int r; |
614 | ||
615 | assert(p); | |
616 | assert(name); | |
617 | ||
e6378561 LP |
618 | r = dns_name_is_valid(name); |
619 | if (r < 0) | |
620 | return r; | |
621 | if (r == 0) | |
622 | return -EINVAL; | |
623 | ||
f6a5fec6 LP |
624 | if (p->refuse_compression) |
625 | allow_compression = false; | |
626 | ||
74b2466e LP |
627 | saved_size = p->size; |
628 | ||
e48b9a64 | 629 | while (!dns_name_is_root(name)) { |
08f904fd | 630 | const char *z = name; |
fd7e9887 | 631 | char label[DNS_LABEL_MAX+1]; |
151226ab | 632 | size_t n = 0; |
74b2466e | 633 | |
151226ab ZJS |
634 | if (allow_compression) |
635 | n = PTR_TO_SIZE(hashmap_get(p->names, name)); | |
74b2466e LP |
636 | if (n > 0) { |
637 | assert(n < p->size); | |
638 | ||
639 | if (n < 0x4000) { | |
640 | r = dns_packet_append_uint16(p, 0xC000 | n, NULL); | |
641 | if (r < 0) | |
642 | goto fail; | |
643 | ||
644 | goto done; | |
645 | } | |
646 | } | |
647 | ||
7470cc4c | 648 | r = dns_label_unescape(&name, label, sizeof label, 0); |
74b2466e LP |
649 | if (r < 0) |
650 | goto fail; | |
651 | ||
a3db237b | 652 | r = dns_packet_append_label(p, label, r, canonical_candidate, &n); |
74b2466e LP |
653 | if (r < 0) |
654 | goto fail; | |
655 | ||
151226ab | 656 | if (allow_compression) { |
08f904fd LP |
657 | _cleanup_free_ char *s = NULL; |
658 | ||
360105f1 LP |
659 | if (!GREEDY_REALLOC(added_entries, n_added_entries + 1)) { |
660 | r = -ENOMEM; | |
661 | goto fail; | |
662 | } | |
663 | ||
08f904fd LP |
664 | s = strdup(z); |
665 | if (!s) { | |
666 | r = -ENOMEM; | |
667 | goto fail; | |
668 | } | |
669 | ||
3004fcd0 | 670 | r = hashmap_ensure_put(&p->names, &dns_name_hash_ops, s, SIZE_TO_PTR(n)); |
151226ab ZJS |
671 | if (r < 0) |
672 | goto fail; | |
74b2466e | 673 | |
360105f1 LP |
674 | /* Keep track of the entries we just added (note that the string is owned by the hashtable, not this array!) */ |
675 | added_entries[n_added_entries++] = TAKE_PTR(s); | |
151226ab | 676 | } |
74b2466e LP |
677 | } |
678 | ||
679 | r = dns_packet_append_uint8(p, 0, NULL); | |
680 | if (r < 0) | |
681 | return r; | |
682 | ||
683 | done: | |
684 | if (start) | |
685 | *start = saved_size; | |
686 | ||
687 | return 0; | |
688 | ||
689 | fail: | |
360105f1 LP |
690 | /* Remove all label compression names we added again */ |
691 | FOREACH_ARRAY(s, added_entries, n_added_entries) { | |
692 | hashmap_remove(p->names, *s); | |
693 | free(*s); | |
694 | } | |
695 | ||
74b2466e LP |
696 | dns_packet_truncate(p, saved_size); |
697 | return r; | |
698 | } | |
699 | ||
58ab31d5 | 700 | int dns_packet_append_key(DnsPacket *p, const DnsResourceKey *k, const DnsAnswerFlags flags, size_t *start) { |
74b2466e | 701 | size_t saved_size; |
58ab31d5 | 702 | uint16_t class; |
74b2466e LP |
703 | int r; |
704 | ||
705 | assert(p); | |
706 | assert(k); | |
707 | ||
708 | saved_size = p->size; | |
709 | ||
1c02e7ba | 710 | r = dns_packet_append_name(p, dns_resource_key_name(k), true, true, NULL); |
74b2466e LP |
711 | if (r < 0) |
712 | goto fail; | |
713 | ||
714 | r = dns_packet_append_uint16(p, k->type, NULL); | |
715 | if (r < 0) | |
716 | goto fail; | |
717 | ||
82d39576 | 718 | class = flags & DNS_ANSWER_CACHE_FLUSH ? k->class | MDNS_RR_CACHE_FLUSH_OR_QU : k->class; |
58ab31d5 | 719 | r = dns_packet_append_uint16(p, class, NULL); |
74b2466e LP |
720 | if (r < 0) |
721 | goto fail; | |
722 | ||
723 | if (start) | |
724 | *start = saved_size; | |
725 | ||
726 | return 0; | |
727 | ||
728 | fail: | |
729 | dns_packet_truncate(p, saved_size); | |
730 | return r; | |
731 | } | |
732 | ||
e1a9f1a8 | 733 | static int dns_packet_append_type_window(DnsPacket *p, uint8_t window, uint8_t length, const uint8_t *types, size_t *start) { |
50f1e641 TG |
734 | size_t saved_size; |
735 | int r; | |
736 | ||
737 | assert(p); | |
738 | assert(types); | |
1792f223 | 739 | assert(length > 0); |
50f1e641 | 740 | |
50f1e641 TG |
741 | saved_size = p->size; |
742 | ||
1792f223 TG |
743 | r = dns_packet_append_uint8(p, window, NULL); |
744 | if (r < 0) | |
745 | goto fail; | |
50f1e641 | 746 | |
1792f223 TG |
747 | r = dns_packet_append_uint8(p, length, NULL); |
748 | if (r < 0) | |
749 | goto fail; | |
6fa91901 | 750 | |
1792f223 TG |
751 | r = dns_packet_append_blob(p, types, length, NULL); |
752 | if (r < 0) | |
753 | goto fail; | |
50f1e641 TG |
754 | |
755 | if (start) | |
756 | *start = saved_size; | |
757 | ||
758 | return 0; | |
759 | fail: | |
760 | dns_packet_truncate(p, saved_size); | |
761 | return r; | |
762 | } | |
763 | ||
764 | static int dns_packet_append_types(DnsPacket *p, Bitmap *types, size_t *start) { | |
765 | uint8_t window = 0; | |
1792f223 | 766 | uint8_t entry = 0; |
50f1e641 TG |
767 | uint8_t bitmaps[32] = {}; |
768 | unsigned n; | |
769 | size_t saved_size; | |
770 | int r; | |
771 | ||
772 | assert(p); | |
50f1e641 TG |
773 | |
774 | saved_size = p->size; | |
775 | ||
90e74a66 | 776 | BITMAP_FOREACH(n, types) { |
50f1e641 TG |
777 | assert(n <= 0xffff); |
778 | ||
1792f223 TG |
779 | if ((n >> 8) != window && bitmaps[entry / 8] != 0) { |
780 | r = dns_packet_append_type_window(p, window, entry / 8 + 1, bitmaps, NULL); | |
50f1e641 TG |
781 | if (r < 0) |
782 | goto fail; | |
783 | ||
1792f223 | 784 | zero(bitmaps); |
50f1e641 TG |
785 | } |
786 | ||
1792f223 | 787 | window = n >> 8; |
50f1e641 TG |
788 | entry = n & 255; |
789 | ||
790 | bitmaps[entry / 8] |= 1 << (7 - (entry % 8)); | |
791 | } | |
792 | ||
d0ae14ff LP |
793 | if (bitmaps[entry / 8] != 0) { |
794 | r = dns_packet_append_type_window(p, window, entry / 8 + 1, bitmaps, NULL); | |
795 | if (r < 0) | |
796 | goto fail; | |
797 | } | |
50f1e641 TG |
798 | |
799 | if (start) | |
800 | *start = saved_size; | |
801 | ||
802 | return 0; | |
803 | fail: | |
804 | dns_packet_truncate(p, saved_size); | |
805 | return r; | |
806 | } | |
807 | ||
dc913c9a | 808 | /* Append the OPT pseudo-RR described in RFC6891 */ |
c36d5b5b LP |
809 | int dns_packet_append_opt( |
810 | DnsPacket *p, | |
811 | uint16_t max_udp_size, | |
812 | bool edns0_do, | |
813 | bool include_rfc6975, | |
4a6eb824 | 814 | const char *nsid, |
c36d5b5b | 815 | int rcode, |
4a6eb824 | 816 | size_t *ret_start) { |
c36d5b5b | 817 | |
dc913c9a TG |
818 | size_t saved_size; |
819 | int r; | |
820 | ||
821 | assert(p); | |
822 | /* we must never advertise supported packet size smaller than the legacy max */ | |
823 | assert(max_udp_size >= DNS_PACKET_UNICAST_SIZE_MAX); | |
f2ed4c69 LP |
824 | assert(rcode >= 0); |
825 | assert(rcode <= _DNS_RCODE_MAX); | |
dc913c9a | 826 | |
f5fbe71d | 827 | if (p->opt_start != SIZE_MAX) |
519ef046 LP |
828 | return -EBUSY; |
829 | ||
f5fbe71d | 830 | assert(p->opt_size == SIZE_MAX); |
519ef046 | 831 | |
dc913c9a TG |
832 | saved_size = p->size; |
833 | ||
834 | /* empty name */ | |
835 | r = dns_packet_append_uint8(p, 0, NULL); | |
836 | if (r < 0) | |
837 | return r; | |
838 | ||
839 | /* type */ | |
840 | r = dns_packet_append_uint16(p, DNS_TYPE_OPT, NULL); | |
841 | if (r < 0) | |
842 | goto fail; | |
843 | ||
f2ed4c69 | 844 | /* class: maximum udp packet that can be received */ |
dc913c9a TG |
845 | r = dns_packet_append_uint16(p, max_udp_size, NULL); |
846 | if (r < 0) | |
847 | goto fail; | |
848 | ||
849 | /* extended RCODE and VERSION */ | |
f2ed4c69 | 850 | r = dns_packet_append_uint16(p, ((uint16_t) rcode & 0x0FF0) << 4, NULL); |
dc913c9a TG |
851 | if (r < 0) |
852 | goto fail; | |
853 | ||
7586f4d1 TG |
854 | /* flags: DNSSEC OK (DO), see RFC3225 */ |
855 | r = dns_packet_append_uint16(p, edns0_do ? EDNS0_OPT_DO : 0, NULL); | |
dc913c9a TG |
856 | if (r < 0) |
857 | goto fail; | |
858 | ||
c36d5b5b LP |
859 | if (edns0_do && include_rfc6975) { |
860 | /* If DO is on and this is requested, also append RFC6975 Algorithm data. This is supposed to | |
861 | * be done on queries, not on replies, hencer callers should turn this off when finishing off | |
862 | * replies. */ | |
665408ac LP |
863 | |
864 | static const uint8_t rfc6975[] = { | |
865 | ||
980cb160 | 866 | 0, DNS_EDNS_OPT_DAU, /* OPTION_CODE */ |
e9d4b88b | 867 | #if HAVE_OPENSSL |
73a4cd17 MCO |
868 | 0, 7, /* LIST_LENGTH */ |
869 | #else | |
665408ac | 870 | 0, 6, /* LIST_LENGTH */ |
73a4cd17 | 871 | #endif |
665408ac LP |
872 | DNSSEC_ALGORITHM_RSASHA1, |
873 | DNSSEC_ALGORITHM_RSASHA1_NSEC3_SHA1, | |
874 | DNSSEC_ALGORITHM_RSASHA256, | |
875 | DNSSEC_ALGORITHM_RSASHA512, | |
876 | DNSSEC_ALGORITHM_ECDSAP256SHA256, | |
877 | DNSSEC_ALGORITHM_ECDSAP384SHA384, | |
e9d4b88b | 878 | #if HAVE_OPENSSL |
73a4cd17 MCO |
879 | DNSSEC_ALGORITHM_ED25519, |
880 | #endif | |
665408ac | 881 | |
980cb160 | 882 | 0, DNS_EDNS_OPT_DHU, /* OPTION_CODE */ |
665408ac LP |
883 | 0, 3, /* LIST_LENGTH */ |
884 | DNSSEC_DIGEST_SHA1, | |
885 | DNSSEC_DIGEST_SHA256, | |
886 | DNSSEC_DIGEST_SHA384, | |
887 | ||
980cb160 | 888 | 0, DNS_EDNS_OPT_N3U, /* OPTION_CODE */ |
665408ac LP |
889 | 0, 1, /* LIST_LENGTH */ |
890 | NSEC3_ALGORITHM_SHA1, | |
891 | }; | |
892 | ||
4a6eb824 LP |
893 | r = dns_packet_append_uint16(p, sizeof(rfc6975), NULL); /* RDLENGTH */ |
894 | if (r < 0) | |
895 | goto fail; | |
896 | ||
897 | r = dns_packet_append_blob(p, rfc6975, sizeof(rfc6975), NULL); /* the payload, as defined above */ | |
898 | ||
899 | } else if (nsid) { | |
900 | ||
901 | if (strlen(nsid) > UINT16_MAX - 4) { | |
902 | r = -E2BIG; | |
903 | goto fail; | |
904 | } | |
905 | ||
906 | r = dns_packet_append_uint16(p, 4 + strlen(nsid), NULL); /* RDLENGTH */ | |
665408ac LP |
907 | if (r < 0) |
908 | goto fail; | |
909 | ||
4a6eb824 LP |
910 | r = dns_packet_append_uint16(p, 3, NULL); /* OPTION-CODE: NSID */ |
911 | if (r < 0) | |
912 | goto fail; | |
913 | ||
914 | r = dns_packet_append_uint16(p, strlen(nsid), NULL); /* OPTION-LENGTH */ | |
915 | if (r < 0) | |
916 | goto fail; | |
917 | ||
918 | r = dns_packet_append_blob(p, nsid, strlen(nsid), NULL); | |
665408ac LP |
919 | } else |
920 | r = dns_packet_append_uint16(p, 0, NULL); | |
dc913c9a TG |
921 | if (r < 0) |
922 | goto fail; | |
923 | ||
519ef046 LP |
924 | DNS_PACKET_HEADER(p)->arcount = htobe16(DNS_PACKET_ARCOUNT(p) + 1); |
925 | ||
926 | p->opt_start = saved_size; | |
927 | p->opt_size = p->size - saved_size; | |
928 | ||
4a6eb824 LP |
929 | if (ret_start) |
930 | *ret_start = saved_size; | |
dc913c9a TG |
931 | |
932 | return 0; | |
933 | ||
934 | fail: | |
935 | dns_packet_truncate(p, saved_size); | |
936 | return r; | |
937 | } | |
938 | ||
519ef046 LP |
939 | int dns_packet_truncate_opt(DnsPacket *p) { |
940 | assert(p); | |
941 | ||
f5fbe71d YW |
942 | if (p->opt_start == SIZE_MAX) { |
943 | assert(p->opt_size == SIZE_MAX); | |
519ef046 LP |
944 | return 0; |
945 | } | |
946 | ||
f5fbe71d | 947 | assert(p->opt_size != SIZE_MAX); |
519ef046 LP |
948 | assert(DNS_PACKET_ARCOUNT(p) > 0); |
949 | ||
950 | if (p->opt_start + p->opt_size != p->size) | |
951 | return -EBUSY; | |
952 | ||
953 | dns_packet_truncate(p, p->opt_start); | |
954 | DNS_PACKET_HEADER(p)->arcount = htobe16(DNS_PACKET_ARCOUNT(p) - 1); | |
f5fbe71d | 955 | p->opt_start = p->opt_size = SIZE_MAX; |
519ef046 LP |
956 | |
957 | return 1; | |
958 | } | |
959 | ||
58ab31d5 | 960 | int dns_packet_append_rr(DnsPacket *p, const DnsResourceRecord *rr, const DnsAnswerFlags flags, size_t *start, size_t *rdata_start) { |
f471bc11 | 961 | |
a8812dd7 | 962 | size_t saved_size, rdlength_offset, end, rdlength, rds; |
c3ae4188 | 963 | uint32_t ttl; |
623a4c97 LP |
964 | int r; |
965 | ||
966 | assert(p); | |
967 | assert(rr); | |
968 | ||
969 | saved_size = p->size; | |
970 | ||
58ab31d5 | 971 | r = dns_packet_append_key(p, rr->key, flags, NULL); |
623a4c97 LP |
972 | if (r < 0) |
973 | goto fail; | |
974 | ||
c3ae4188 DR |
975 | ttl = flags & DNS_ANSWER_GOODBYE ? 0 : rr->ttl; |
976 | r = dns_packet_append_uint32(p, ttl, NULL); | |
623a4c97 LP |
977 | if (r < 0) |
978 | goto fail; | |
979 | ||
980 | /* Initially we write 0 here */ | |
981 | r = dns_packet_append_uint16(p, 0, &rdlength_offset); | |
982 | if (r < 0) | |
983 | goto fail; | |
984 | ||
a8812dd7 LP |
985 | rds = p->size - saved_size; |
986 | ||
52e085af | 987 | switch (rr->unparsable ? _DNS_TYPE_INVALID : rr->key->type) { |
623a4c97 | 988 | |
9c92ce6d LP |
989 | case DNS_TYPE_SRV: |
990 | r = dns_packet_append_uint16(p, rr->srv.priority, NULL); | |
991 | if (r < 0) | |
992 | goto fail; | |
993 | ||
994 | r = dns_packet_append_uint16(p, rr->srv.weight, NULL); | |
995 | if (r < 0) | |
996 | goto fail; | |
997 | ||
998 | r = dns_packet_append_uint16(p, rr->srv.port, NULL); | |
999 | if (r < 0) | |
1000 | goto fail; | |
1001 | ||
d9a55740 LP |
1002 | /* RFC 2782 states "Unless and until permitted by future standards action, name compression |
1003 | * is not to be used for this field." Hence we turn off compression here. */ | |
1004 | r = dns_packet_append_name(p, rr->srv.name, /* allow_compression= */ false, /* canonical_candidate= */ true, NULL); | |
9c92ce6d LP |
1005 | break; |
1006 | ||
623a4c97 LP |
1007 | case DNS_TYPE_PTR: |
1008 | case DNS_TYPE_NS: | |
1009 | case DNS_TYPE_CNAME: | |
8ac4e9e1 | 1010 | case DNS_TYPE_DNAME: |
4e58741d | 1011 | r = dns_packet_append_name(p, rr->ptr.name, true, true, NULL); |
623a4c97 LP |
1012 | break; |
1013 | ||
1014 | case DNS_TYPE_HINFO: | |
1015 | r = dns_packet_append_string(p, rr->hinfo.cpu, NULL); | |
1016 | if (r < 0) | |
1017 | goto fail; | |
1018 | ||
1019 | r = dns_packet_append_string(p, rr->hinfo.os, NULL); | |
1020 | break; | |
1021 | ||
9de3e329 | 1022 | case DNS_TYPE_SPF: /* exactly the same as TXT */ |
2001c805 | 1023 | case DNS_TYPE_TXT: |
2e276efc | 1024 | |
2001c805 | 1025 | if (!rr->txt.items) { |
1ccda9b7 LP |
1026 | /* RFC 6763, section 6.1 suggests to generate |
1027 | * single empty string for an empty array. */ | |
1028 | ||
2001c805 | 1029 | r = dns_packet_append_raw_string(p, NULL, 0, NULL); |
2e276efc ZJS |
1030 | if (r < 0) |
1031 | goto fail; | |
03677889 | 1032 | } else |
2001c805 LP |
1033 | LIST_FOREACH(items, i, rr->txt.items) { |
1034 | r = dns_packet_append_raw_string(p, i->data, i->length, NULL); | |
1ccda9b7 LP |
1035 | if (r < 0) |
1036 | goto fail; | |
1037 | } | |
2e276efc | 1038 | |
6a6fc3df | 1039 | r = 0; |
2e276efc | 1040 | break; |
2e276efc | 1041 | |
623a4c97 LP |
1042 | case DNS_TYPE_A: |
1043 | r = dns_packet_append_blob(p, &rr->a.in_addr, sizeof(struct in_addr), NULL); | |
1044 | break; | |
1045 | ||
1046 | case DNS_TYPE_AAAA: | |
1047 | r = dns_packet_append_blob(p, &rr->aaaa.in6_addr, sizeof(struct in6_addr), NULL); | |
1048 | break; | |
1049 | ||
1050 | case DNS_TYPE_SOA: | |
4e58741d | 1051 | r = dns_packet_append_name(p, rr->soa.mname, true, true, NULL); |
623a4c97 LP |
1052 | if (r < 0) |
1053 | goto fail; | |
1054 | ||
4e58741d | 1055 | r = dns_packet_append_name(p, rr->soa.rname, true, true, NULL); |
623a4c97 LP |
1056 | if (r < 0) |
1057 | goto fail; | |
1058 | ||
1059 | r = dns_packet_append_uint32(p, rr->soa.serial, NULL); | |
1060 | if (r < 0) | |
1061 | goto fail; | |
1062 | ||
1063 | r = dns_packet_append_uint32(p, rr->soa.refresh, NULL); | |
1064 | if (r < 0) | |
1065 | goto fail; | |
1066 | ||
1067 | r = dns_packet_append_uint32(p, rr->soa.retry, NULL); | |
1068 | if (r < 0) | |
1069 | goto fail; | |
1070 | ||
1071 | r = dns_packet_append_uint32(p, rr->soa.expire, NULL); | |
1072 | if (r < 0) | |
1073 | goto fail; | |
1074 | ||
1075 | r = dns_packet_append_uint32(p, rr->soa.minimum, NULL); | |
1076 | break; | |
1077 | ||
1078 | case DNS_TYPE_MX: | |
946c7094 ZJS |
1079 | r = dns_packet_append_uint16(p, rr->mx.priority, NULL); |
1080 | if (r < 0) | |
1081 | goto fail; | |
1082 | ||
4e58741d | 1083 | r = dns_packet_append_name(p, rr->mx.exchange, true, true, NULL); |
946c7094 ZJS |
1084 | break; |
1085 | ||
0dae31d4 ZJS |
1086 | case DNS_TYPE_LOC: |
1087 | r = dns_packet_append_uint8(p, rr->loc.version, NULL); | |
1088 | if (r < 0) | |
1089 | goto fail; | |
1090 | ||
1091 | r = dns_packet_append_uint8(p, rr->loc.size, NULL); | |
1092 | if (r < 0) | |
1093 | goto fail; | |
1094 | ||
1095 | r = dns_packet_append_uint8(p, rr->loc.horiz_pre, NULL); | |
1096 | if (r < 0) | |
1097 | goto fail; | |
1098 | ||
1099 | r = dns_packet_append_uint8(p, rr->loc.vert_pre, NULL); | |
1100 | if (r < 0) | |
1101 | goto fail; | |
1102 | ||
afbc4f26 | 1103 | r = dns_packet_append_uint32(p, rr->loc.latitude, NULL); |
0dae31d4 ZJS |
1104 | if (r < 0) |
1105 | goto fail; | |
1106 | ||
afbc4f26 | 1107 | r = dns_packet_append_uint32(p, rr->loc.longitude, NULL); |
0dae31d4 ZJS |
1108 | if (r < 0) |
1109 | goto fail; | |
1110 | ||
afbc4f26 | 1111 | r = dns_packet_append_uint32(p, rr->loc.altitude, NULL); |
0dae31d4 ZJS |
1112 | break; |
1113 | ||
abf126a3 TG |
1114 | case DNS_TYPE_DS: |
1115 | r = dns_packet_append_uint16(p, rr->ds.key_tag, NULL); | |
1116 | if (r < 0) | |
1117 | goto fail; | |
1118 | ||
1119 | r = dns_packet_append_uint8(p, rr->ds.algorithm, NULL); | |
1120 | if (r < 0) | |
1121 | goto fail; | |
1122 | ||
1123 | r = dns_packet_append_uint8(p, rr->ds.digest_type, NULL); | |
1124 | if (r < 0) | |
1125 | goto fail; | |
1126 | ||
1127 | r = dns_packet_append_blob(p, rr->ds.digest, rr->ds.digest_size, NULL); | |
1128 | break; | |
1129 | ||
623a4c97 | 1130 | case DNS_TYPE_SSHFP: |
42cc2eeb LP |
1131 | r = dns_packet_append_uint8(p, rr->sshfp.algorithm, NULL); |
1132 | if (r < 0) | |
1133 | goto fail; | |
8db0d2f5 | 1134 | |
42cc2eeb LP |
1135 | r = dns_packet_append_uint8(p, rr->sshfp.fptype, NULL); |
1136 | if (r < 0) | |
1137 | goto fail; | |
1138 | ||
549c1a25 | 1139 | r = dns_packet_append_blob(p, rr->sshfp.fingerprint, rr->sshfp.fingerprint_size, NULL); |
42cc2eeb LP |
1140 | break; |
1141 | ||
8db0d2f5 | 1142 | case DNS_TYPE_DNSKEY: |
f91dc240 | 1143 | r = dns_packet_append_uint16(p, rr->dnskey.flags, NULL); |
8db0d2f5 ZJS |
1144 | if (r < 0) |
1145 | goto fail; | |
1146 | ||
f91dc240 | 1147 | r = dns_packet_append_uint8(p, rr->dnskey.protocol, NULL); |
8db0d2f5 ZJS |
1148 | if (r < 0) |
1149 | goto fail; | |
1150 | ||
1151 | r = dns_packet_append_uint8(p, rr->dnskey.algorithm, NULL); | |
1152 | if (r < 0) | |
1153 | goto fail; | |
1154 | ||
1155 | r = dns_packet_append_blob(p, rr->dnskey.key, rr->dnskey.key_size, NULL); | |
1156 | break; | |
1157 | ||
151226ab ZJS |
1158 | case DNS_TYPE_RRSIG: |
1159 | r = dns_packet_append_uint16(p, rr->rrsig.type_covered, NULL); | |
1160 | if (r < 0) | |
1161 | goto fail; | |
1162 | ||
1163 | r = dns_packet_append_uint8(p, rr->rrsig.algorithm, NULL); | |
1164 | if (r < 0) | |
1165 | goto fail; | |
1166 | ||
1167 | r = dns_packet_append_uint8(p, rr->rrsig.labels, NULL); | |
1168 | if (r < 0) | |
1169 | goto fail; | |
1170 | ||
1171 | r = dns_packet_append_uint32(p, rr->rrsig.original_ttl, NULL); | |
1172 | if (r < 0) | |
1173 | goto fail; | |
1174 | ||
1175 | r = dns_packet_append_uint32(p, rr->rrsig.expiration, NULL); | |
1176 | if (r < 0) | |
1177 | goto fail; | |
1178 | ||
1179 | r = dns_packet_append_uint32(p, rr->rrsig.inception, NULL); | |
1180 | if (r < 0) | |
1181 | goto fail; | |
1182 | ||
0b1b17d3 | 1183 | r = dns_packet_append_uint16(p, rr->rrsig.key_tag, NULL); |
151226ab ZJS |
1184 | if (r < 0) |
1185 | goto fail; | |
1186 | ||
a3db237b | 1187 | r = dns_packet_append_name(p, rr->rrsig.signer, false, true, NULL); |
151226ab ZJS |
1188 | if (r < 0) |
1189 | goto fail; | |
1190 | ||
1191 | r = dns_packet_append_blob(p, rr->rrsig.signature, rr->rrsig.signature_size, NULL); | |
1192 | break; | |
1193 | ||
50f1e641 | 1194 | case DNS_TYPE_NSEC: |
a3db237b | 1195 | r = dns_packet_append_name(p, rr->nsec.next_domain_name, false, false, NULL); |
50f1e641 TG |
1196 | if (r < 0) |
1197 | goto fail; | |
1198 | ||
1199 | r = dns_packet_append_types(p, rr->nsec.types, NULL); | |
1200 | if (r < 0) | |
1201 | goto fail; | |
1202 | ||
5d45a880 | 1203 | break; |
d75acfb0 | 1204 | |
5d45a880 TG |
1205 | case DNS_TYPE_NSEC3: |
1206 | r = dns_packet_append_uint8(p, rr->nsec3.algorithm, NULL); | |
1207 | if (r < 0) | |
1208 | goto fail; | |
1209 | ||
1210 | r = dns_packet_append_uint8(p, rr->nsec3.flags, NULL); | |
1211 | if (r < 0) | |
1212 | goto fail; | |
1213 | ||
1214 | r = dns_packet_append_uint16(p, rr->nsec3.iterations, NULL); | |
1215 | if (r < 0) | |
1216 | goto fail; | |
1217 | ||
1218 | r = dns_packet_append_uint8(p, rr->nsec3.salt_size, NULL); | |
1219 | if (r < 0) | |
1220 | goto fail; | |
1221 | ||
1222 | r = dns_packet_append_blob(p, rr->nsec3.salt, rr->nsec3.salt_size, NULL); | |
1223 | if (r < 0) | |
1224 | goto fail; | |
1225 | ||
1226 | r = dns_packet_append_uint8(p, rr->nsec3.next_hashed_name_size, NULL); | |
1227 | if (r < 0) | |
1228 | goto fail; | |
1229 | ||
1230 | r = dns_packet_append_blob(p, rr->nsec3.next_hashed_name, rr->nsec3.next_hashed_name_size, NULL); | |
1231 | if (r < 0) | |
1232 | goto fail; | |
1233 | ||
1234 | r = dns_packet_append_types(p, rr->nsec3.types, NULL); | |
1235 | if (r < 0) | |
1236 | goto fail; | |
1237 | ||
50f1e641 | 1238 | break; |
d75acfb0 | 1239 | |
48d45d2b ZJS |
1240 | case DNS_TYPE_TLSA: |
1241 | r = dns_packet_append_uint8(p, rr->tlsa.cert_usage, NULL); | |
1242 | if (r < 0) | |
1243 | goto fail; | |
1244 | ||
1245 | r = dns_packet_append_uint8(p, rr->tlsa.selector, NULL); | |
1246 | if (r < 0) | |
1247 | goto fail; | |
1248 | ||
1249 | r = dns_packet_append_uint8(p, rr->tlsa.matching_type, NULL); | |
1250 | if (r < 0) | |
1251 | goto fail; | |
1252 | ||
1253 | r = dns_packet_append_blob(p, rr->tlsa.data, rr->tlsa.data_size, NULL); | |
1254 | break; | |
1255 | ||
e7634d6b RP |
1256 | case DNS_TYPE_SVCB: |
1257 | case DNS_TYPE_HTTPS: | |
1258 | r = dns_packet_append_uint16(p, rr->svcb.priority, NULL); | |
1259 | if (r < 0) | |
1260 | goto fail; | |
1261 | ||
1262 | r = dns_packet_append_name(p, rr->svcb.target_name, false, false, NULL); | |
1263 | if (r < 0) | |
1264 | goto fail; | |
1265 | ||
1266 | LIST_FOREACH(params, i, rr->svcb.params) { | |
1267 | r = dns_packet_append_uint16(p, i->key, NULL); | |
1268 | if (r < 0) | |
1269 | goto fail; | |
1270 | ||
1271 | r = dns_packet_append_uint16(p, i->length, NULL); | |
1272 | if (r < 0) | |
1273 | goto fail; | |
1274 | ||
1275 | r = dns_packet_append_blob(p, i->value, i->length, NULL); | |
1276 | if (r < 0) | |
1277 | goto fail; | |
1278 | } | |
1279 | break; | |
1280 | ||
95052df3 ZJS |
1281 | case DNS_TYPE_CAA: |
1282 | r = dns_packet_append_uint8(p, rr->caa.flags, NULL); | |
1283 | if (r < 0) | |
1284 | goto fail; | |
1285 | ||
1286 | r = dns_packet_append_string(p, rr->caa.tag, NULL); | |
1287 | if (r < 0) | |
1288 | goto fail; | |
1289 | ||
1290 | r = dns_packet_append_blob(p, rr->caa.value, rr->caa.value_size, NULL); | |
1291 | break; | |
1292 | ||
17615676 LP |
1293 | case DNS_TYPE_NAPTR: |
1294 | r = dns_packet_append_uint16(p, rr->naptr.order, NULL); | |
1295 | if (r < 0) | |
1296 | goto fail; | |
1297 | ||
1298 | r = dns_packet_append_uint16(p, rr->naptr.preference, NULL); | |
1299 | if (r < 0) | |
1300 | goto fail; | |
1301 | ||
1302 | r = dns_packet_append_string(p, rr->naptr.flags, NULL); | |
1303 | if (r < 0) | |
1304 | goto fail; | |
1305 | ||
1306 | r = dns_packet_append_string(p, rr->naptr.services, NULL); | |
1307 | if (r < 0) | |
1308 | goto fail; | |
1309 | ||
1310 | r = dns_packet_append_string(p, rr->naptr.regexp, NULL); | |
1311 | if (r < 0) | |
1312 | goto fail; | |
1313 | ||
1314 | r = dns_packet_append_name(p, rr->naptr.replacement, /* allow_compression= */ false, /* canonical_candidate= */ true, NULL); | |
1315 | break; | |
1316 | ||
d75acfb0 | 1317 | case DNS_TYPE_OPT: |
d93a16b8 | 1318 | case DNS_TYPE_OPENPGPKEY: |
52e085af | 1319 | case _DNS_TYPE_INVALID: /* unparsable */ |
623a4c97 | 1320 | default: |
a43a068a | 1321 | r = dns_packet_append_blob(p, rr->generic.data, rr->generic.data_size, NULL); |
623a4c97 LP |
1322 | } |
1323 | if (r < 0) | |
1324 | goto fail; | |
1325 | ||
1326 | /* Let's calculate the actual data size and update the field */ | |
1327 | rdlength = p->size - rdlength_offset - sizeof(uint16_t); | |
1328 | if (rdlength > 0xFFFF) { | |
555f5cdc | 1329 | r = -ENOSPC; |
623a4c97 LP |
1330 | goto fail; |
1331 | } | |
1332 | ||
1333 | end = p->size; | |
1334 | p->size = rdlength_offset; | |
1335 | r = dns_packet_append_uint16(p, rdlength, NULL); | |
1336 | if (r < 0) | |
1337 | goto fail; | |
1338 | p->size = end; | |
1339 | ||
351e6342 LP |
1340 | if (start) |
1341 | *start = saved_size; | |
1342 | ||
a8812dd7 LP |
1343 | if (rdata_start) |
1344 | *rdata_start = rds; | |
1345 | ||
623a4c97 LP |
1346 | return 0; |
1347 | ||
1348 | fail: | |
1349 | dns_packet_truncate(p, saved_size); | |
1350 | return r; | |
1351 | } | |
1352 | ||
f471bc11 LP |
1353 | int dns_packet_append_question(DnsPacket *p, DnsQuestion *q) { |
1354 | DnsResourceKey *key; | |
1355 | int r; | |
1356 | ||
1357 | assert(p); | |
1358 | ||
1359 | DNS_QUESTION_FOREACH(key, q) { | |
58ab31d5 | 1360 | r = dns_packet_append_key(p, key, 0, NULL); |
f471bc11 LP |
1361 | if (r < 0) |
1362 | return r; | |
1363 | } | |
1364 | ||
1365 | return 0; | |
1366 | } | |
1367 | ||
6f76e68a | 1368 | int dns_packet_append_answer(DnsPacket *p, DnsAnswer *a, unsigned *completed) { |
f471bc11 | 1369 | DnsResourceRecord *rr; |
58ab31d5 | 1370 | DnsAnswerFlags flags; |
f471bc11 LP |
1371 | int r; |
1372 | ||
1373 | assert(p); | |
1374 | ||
58ab31d5 DR |
1375 | DNS_ANSWER_FOREACH_FLAGS(rr, flags, a) { |
1376 | r = dns_packet_append_rr(p, rr, flags, NULL, NULL); | |
f471bc11 LP |
1377 | if (r < 0) |
1378 | return r; | |
6f76e68a LP |
1379 | |
1380 | if (completed) | |
1381 | (*completed)++; | |
f471bc11 LP |
1382 | } |
1383 | ||
1384 | return 0; | |
1385 | } | |
1386 | ||
74b2466e LP |
1387 | int dns_packet_read(DnsPacket *p, size_t sz, const void **ret, size_t *start) { |
1388 | assert(p); | |
370999c0 | 1389 | assert(p->rindex <= p->size); |
74b2466e | 1390 | |
370999c0 | 1391 | if (sz > p->size - p->rindex) |
74b2466e LP |
1392 | return -EMSGSIZE; |
1393 | ||
1394 | if (ret) | |
1395 | *ret = (uint8_t*) DNS_PACKET_DATA(p) + p->rindex; | |
1396 | ||
1397 | if (start) | |
1398 | *start = p->rindex; | |
1399 | ||
1400 | p->rindex += sz; | |
1401 | return 0; | |
1402 | } | |
1403 | ||
8ba9fd9c | 1404 | void dns_packet_rewind(DnsPacket *p, size_t idx) { |
74b2466e LP |
1405 | assert(p); |
1406 | assert(idx <= p->size); | |
1407 | assert(idx >= DNS_PACKET_HEADER_SIZE); | |
1408 | ||
1409 | p->rindex = idx; | |
1410 | } | |
1411 | ||
623a4c97 LP |
1412 | int dns_packet_read_blob(DnsPacket *p, void *d, size_t sz, size_t *start) { |
1413 | const void *q; | |
1414 | int r; | |
1415 | ||
1416 | assert(p); | |
1417 | assert(d); | |
1418 | ||
1419 | r = dns_packet_read(p, sz, &q, start); | |
1420 | if (r < 0) | |
1421 | return r; | |
1422 | ||
1423 | memcpy(d, q, sz); | |
1424 | return 0; | |
1425 | } | |
1426 | ||
f5430a3e LP |
1427 | static int dns_packet_read_memdup( |
1428 | DnsPacket *p, size_t size, | |
1429 | void **ret, size_t *ret_size, | |
1430 | size_t *ret_start) { | |
1431 | ||
1432 | const void *src; | |
1433 | size_t start; | |
1434 | int r; | |
1435 | ||
1436 | assert(p); | |
1437 | assert(ret); | |
1438 | ||
1439 | r = dns_packet_read(p, size, &src, &start); | |
1440 | if (r < 0) | |
1441 | return r; | |
1442 | ||
1443 | if (size <= 0) | |
1444 | *ret = NULL; | |
1445 | else { | |
1446 | void *copy; | |
1447 | ||
1448 | copy = memdup(src, size); | |
1449 | if (!copy) | |
1450 | return -ENOMEM; | |
1451 | ||
1452 | *ret = copy; | |
1453 | } | |
1454 | ||
1455 | if (ret_size) | |
1456 | *ret_size = size; | |
1457 | if (ret_start) | |
1458 | *ret_start = start; | |
1459 | ||
1460 | return 0; | |
1461 | } | |
1462 | ||
74b2466e LP |
1463 | int dns_packet_read_uint8(DnsPacket *p, uint8_t *ret, size_t *start) { |
1464 | const void *d; | |
1465 | int r; | |
1466 | ||
1467 | assert(p); | |
1468 | ||
1469 | r = dns_packet_read(p, sizeof(uint8_t), &d, start); | |
1470 | if (r < 0) | |
1471 | return r; | |
1472 | ||
1473 | *ret = ((uint8_t*) d)[0]; | |
1474 | return 0; | |
1475 | } | |
1476 | ||
1477 | int dns_packet_read_uint16(DnsPacket *p, uint16_t *ret, size_t *start) { | |
1478 | const void *d; | |
1479 | int r; | |
1480 | ||
1481 | assert(p); | |
1482 | ||
1483 | r = dns_packet_read(p, sizeof(uint16_t), &d, start); | |
1484 | if (r < 0) | |
1485 | return r; | |
1486 | ||
81b4d94d LP |
1487 | if (ret) |
1488 | *ret = unaligned_read_be16(d); | |
725ca0e5 | 1489 | |
74b2466e LP |
1490 | return 0; |
1491 | } | |
1492 | ||
1493 | int dns_packet_read_uint32(DnsPacket *p, uint32_t *ret, size_t *start) { | |
1494 | const void *d; | |
1495 | int r; | |
1496 | ||
1497 | assert(p); | |
1498 | ||
1499 | r = dns_packet_read(p, sizeof(uint32_t), &d, start); | |
1500 | if (r < 0) | |
1501 | return r; | |
1502 | ||
725ca0e5 | 1503 | *ret = unaligned_read_be32(d); |
74b2466e LP |
1504 | |
1505 | return 0; | |
1506 | } | |
1507 | ||
1508 | int dns_packet_read_string(DnsPacket *p, char **ret, size_t *start) { | |
0c4f37f0 | 1509 | _cleanup_(rewind_dns_packet) DnsPacketRewinder rewinder = REWINDER_INIT(p); |
7153213e | 1510 | _cleanup_free_ char *t = NULL; |
74b2466e | 1511 | const void *d; |
74b2466e LP |
1512 | uint8_t c; |
1513 | int r; | |
1514 | ||
7153213e LP |
1515 | assert(p); |
1516 | ||
74b2466e LP |
1517 | r = dns_packet_read_uint8(p, &c, NULL); |
1518 | if (r < 0) | |
e18a3c73 | 1519 | return r; |
74b2466e LP |
1520 | |
1521 | r = dns_packet_read(p, c, &d, NULL); | |
1522 | if (r < 0) | |
e18a3c73 | 1523 | return r; |
74b2466e | 1524 | |
7153213e LP |
1525 | r = make_cstring(d, c, MAKE_CSTRING_REFUSE_TRAILING_NUL, &t); |
1526 | if (r < 0) | |
1527 | return r; | |
74b2466e | 1528 | |
7153213e | 1529 | if (!utf8_is_valid(t)) |
e18a3c73 | 1530 | return -EBADMSG; |
74b2466e | 1531 | |
7153213e | 1532 | *ret = TAKE_PTR(t); |
74b2466e LP |
1533 | |
1534 | if (start) | |
e18a3c73 ZJS |
1535 | *start = rewinder.saved_rindex; |
1536 | CANCEL_REWINDER(rewinder); | |
74b2466e LP |
1537 | |
1538 | return 0; | |
74b2466e LP |
1539 | } |
1540 | ||
2001c805 | 1541 | int dns_packet_read_raw_string(DnsPacket *p, const void **ret, size_t *size, size_t *start) { |
0c4f37f0 ZJS |
1542 | assert(p); |
1543 | ||
1544 | _cleanup_(rewind_dns_packet) DnsPacketRewinder rewinder = REWINDER_INIT(p); | |
2001c805 LP |
1545 | uint8_t c; |
1546 | int r; | |
1547 | ||
2001c805 LP |
1548 | r = dns_packet_read_uint8(p, &c, NULL); |
1549 | if (r < 0) | |
e18a3c73 | 1550 | return r; |
2001c805 LP |
1551 | |
1552 | r = dns_packet_read(p, c, ret, NULL); | |
1553 | if (r < 0) | |
e18a3c73 | 1554 | return r; |
2001c805 LP |
1555 | |
1556 | if (size) | |
1557 | *size = c; | |
1558 | if (start) | |
e18a3c73 ZJS |
1559 | *start = rewinder.saved_rindex; |
1560 | CANCEL_REWINDER(rewinder); | |
2001c805 LP |
1561 | |
1562 | return 0; | |
2001c805 LP |
1563 | } |
1564 | ||
f6a5fec6 LP |
1565 | int dns_packet_read_name( |
1566 | DnsPacket *p, | |
81b4d94d | 1567 | char **ret, |
f6a5fec6 | 1568 | bool allow_compression, |
81b4d94d | 1569 | size_t *ret_start) { |
f6a5fec6 | 1570 | |
0c4f37f0 ZJS |
1571 | assert(p); |
1572 | ||
1573 | _cleanup_(rewind_dns_packet) DnsPacketRewinder rewinder = REWINDER_INIT(p); | |
1574 | size_t after_rindex = 0, jump_barrier = p->rindex; | |
81b4d94d | 1575 | _cleanup_free_ char *name = NULL; |
74b2466e | 1576 | bool first = true; |
87d6a9fb | 1577 | size_t n = 0, m = 0; |
74b2466e LP |
1578 | int r; |
1579 | ||
f6a5fec6 LP |
1580 | if (p->refuse_compression) |
1581 | allow_compression = false; | |
1582 | ||
74b2466e LP |
1583 | for (;;) { |
1584 | uint8_t c, d; | |
1585 | ||
1586 | r = dns_packet_read_uint8(p, &c, NULL); | |
1587 | if (r < 0) | |
e18a3c73 | 1588 | return r; |
74b2466e LP |
1589 | |
1590 | if (c == 0) | |
1591 | /* End of name */ | |
1592 | break; | |
1593 | else if (c <= 63) { | |
74b2466e LP |
1594 | const char *label; |
1595 | ||
1596 | /* Literal label */ | |
1597 | r = dns_packet_read(p, c, (const void**) &label, NULL); | |
1598 | if (r < 0) | |
e18a3c73 | 1599 | return r; |
74b2466e | 1600 | |
319a4f4b | 1601 | if (!GREEDY_REALLOC(name, n + !first + DNS_LABEL_ESCAPED_MAX)) |
e18a3c73 | 1602 | return -ENOMEM; |
74b2466e | 1603 | |
422baca0 | 1604 | if (first) |
74b2466e | 1605 | first = false; |
87d6a9fb | 1606 | else { |
81b4d94d | 1607 | name[n++] = '.'; |
87d6a9fb LP |
1608 | m++; |
1609 | } | |
422baca0 | 1610 | |
81b4d94d | 1611 | r = dns_label_escape(label, c, name + n, DNS_LABEL_ESCAPED_MAX); |
422baca0 | 1612 | if (r < 0) |
e18a3c73 | 1613 | return r; |
74b2466e | 1614 | |
74b2466e | 1615 | n += r; |
87d6a9fb LP |
1616 | m += c; |
1617 | ||
1618 | if (m > DNS_HOSTNAME_MAX) | |
1619 | return -EBADMSG; | |
1620 | ||
74b2466e | 1621 | continue; |
d7a0f1f4 | 1622 | } else if (allow_compression && FLAGS_SET(c, 0xc0)) { |
74b2466e LP |
1623 | uint16_t ptr; |
1624 | ||
1625 | /* Pointer */ | |
1626 | r = dns_packet_read_uint8(p, &d, NULL); | |
1627 | if (r < 0) | |
e18a3c73 | 1628 | return r; |
74b2466e LP |
1629 | |
1630 | ptr = (uint16_t) (c & ~0xc0) << 8 | (uint16_t) d; | |
e18a3c73 ZJS |
1631 | if (ptr < DNS_PACKET_HEADER_SIZE || ptr >= jump_barrier) |
1632 | return -EBADMSG; | |
74b2466e LP |
1633 | |
1634 | if (after_rindex == 0) | |
1635 | after_rindex = p->rindex; | |
1636 | ||
f131770b | 1637 | /* Jumps are limited to a "prior occurrence" (RFC-1035 4.1.4) */ |
c75dbf9b | 1638 | jump_barrier = ptr; |
74b2466e | 1639 | p->rindex = ptr; |
e18a3c73 ZJS |
1640 | } else |
1641 | return -EBADMSG; | |
74b2466e LP |
1642 | } |
1643 | ||
319a4f4b | 1644 | if (!GREEDY_REALLOC(name, n + 1)) |
e18a3c73 | 1645 | return -ENOMEM; |
74b2466e | 1646 | |
81b4d94d | 1647 | name[n] = 0; |
74b2466e LP |
1648 | |
1649 | if (after_rindex != 0) | |
1650 | p->rindex= after_rindex; | |
1651 | ||
81b4d94d LP |
1652 | if (ret) |
1653 | *ret = TAKE_PTR(name); | |
1654 | if (ret_start) | |
1655 | *ret_start = rewinder.saved_rindex; | |
74b2466e | 1656 | |
e18a3c73 | 1657 | CANCEL_REWINDER(rewinder); |
74b2466e LP |
1658 | |
1659 | return 0; | |
74b2466e LP |
1660 | } |
1661 | ||
50f1e641 | 1662 | static int dns_packet_read_type_window(DnsPacket *p, Bitmap **types, size_t *start) { |
0c4f37f0 ZJS |
1663 | assert(p); |
1664 | assert(types); | |
1665 | ||
1666 | _cleanup_(rewind_dns_packet) DnsPacketRewinder rewinder = REWINDER_INIT(p); | |
1667 | uint8_t window, length; | |
50f1e641 | 1668 | const uint8_t *bitmap; |
2ad613ad | 1669 | uint8_t bit = 0; |
50f1e641 | 1670 | bool found = false; |
50f1e641 TG |
1671 | int r; |
1672 | ||
50f1e641 TG |
1673 | r = bitmap_ensure_allocated(types); |
1674 | if (r < 0) | |
e18a3c73 | 1675 | return r; |
50f1e641 TG |
1676 | |
1677 | r = dns_packet_read_uint8(p, &window, NULL); | |
1678 | if (r < 0) | |
e18a3c73 | 1679 | return r; |
50f1e641 TG |
1680 | |
1681 | r = dns_packet_read_uint8(p, &length, NULL); | |
1682 | if (r < 0) | |
e18a3c73 | 1683 | return r; |
50f1e641 TG |
1684 | |
1685 | if (length == 0 || length > 32) | |
1686 | return -EBADMSG; | |
1687 | ||
1688 | r = dns_packet_read(p, length, (const void **)&bitmap, NULL); | |
1689 | if (r < 0) | |
e18a3c73 | 1690 | return r; |
50f1e641 | 1691 | |
64ea42e9 | 1692 | for (uint8_t i = 0; i < length; i++) { |
50f1e641 | 1693 | uint8_t bitmask = 1 << 7; |
50f1e641 TG |
1694 | |
1695 | if (!bitmap[i]) { | |
1696 | found = false; | |
2ad613ad | 1697 | bit += 8; |
50f1e641 TG |
1698 | continue; |
1699 | } | |
1700 | ||
1701 | found = true; | |
1702 | ||
9f939335 | 1703 | for (; bitmask; bit++, bitmask >>= 1) |
50f1e641 TG |
1704 | if (bitmap[i] & bitmask) { |
1705 | uint16_t n; | |
1706 | ||
50f1e641 TG |
1707 | n = (uint16_t) window << 8 | (uint16_t) bit; |
1708 | ||
8e6edc49 TG |
1709 | /* Ignore pseudo-types. see RFC4034 section 4.1.2 */ |
1710 | if (dns_type_is_pseudo(n)) | |
1711 | continue; | |
1712 | ||
50f1e641 TG |
1713 | r = bitmap_set(*types, n); |
1714 | if (r < 0) | |
e18a3c73 | 1715 | return r; |
50f1e641 | 1716 | } |
50f1e641 TG |
1717 | } |
1718 | ||
1719 | if (!found) | |
1720 | return -EBADMSG; | |
1721 | ||
1722 | if (start) | |
e18a3c73 ZJS |
1723 | *start = rewinder.saved_rindex; |
1724 | CANCEL_REWINDER(rewinder); | |
50f1e641 TG |
1725 | |
1726 | return 0; | |
50f1e641 TG |
1727 | } |
1728 | ||
89492aaf | 1729 | static int dns_packet_read_type_windows(DnsPacket *p, Bitmap **types, size_t size, size_t *start) { |
0c4f37f0 | 1730 | _cleanup_(rewind_dns_packet) DnsPacketRewinder rewinder = REWINDER_INIT(p); |
89492aaf TG |
1731 | int r; |
1732 | ||
370999c0 | 1733 | while (p->rindex - rewinder.saved_rindex < size) { |
89492aaf TG |
1734 | r = dns_packet_read_type_window(p, types, NULL); |
1735 | if (r < 0) | |
e18a3c73 | 1736 | return r; |
89492aaf | 1737 | |
370999c0 YW |
1738 | assert(p->rindex >= rewinder.saved_rindex); |
1739 | ||
89492aaf | 1740 | /* don't read past end of current RR */ |
370999c0 | 1741 | if (p->rindex - rewinder.saved_rindex > size) |
e18a3c73 | 1742 | return -EBADMSG; |
89492aaf TG |
1743 | } |
1744 | ||
370999c0 | 1745 | if (p->rindex - rewinder.saved_rindex != size) |
e18a3c73 | 1746 | return -EBADMSG; |
89492aaf TG |
1747 | |
1748 | if (start) | |
e18a3c73 ZJS |
1749 | *start = rewinder.saved_rindex; |
1750 | CANCEL_REWINDER(rewinder); | |
89492aaf TG |
1751 | |
1752 | return 0; | |
89492aaf TG |
1753 | } |
1754 | ||
81b4d94d LP |
1755 | int dns_packet_read_key( |
1756 | DnsPacket *p, | |
1757 | DnsResourceKey **ret, | |
82d39576 | 1758 | bool *ret_cache_flush_or_qu, |
81b4d94d LP |
1759 | size_t *ret_start) { |
1760 | ||
0c4f37f0 ZJS |
1761 | assert(p); |
1762 | ||
1763 | _cleanup_(rewind_dns_packet) DnsPacketRewinder rewinder = REWINDER_INIT(p); | |
faa133f3 | 1764 | _cleanup_free_ char *name = NULL; |
82d39576 | 1765 | bool cache_flush_or_qu = false; |
faa133f3 | 1766 | uint16_t class, type; |
74b2466e LP |
1767 | int r; |
1768 | ||
151226ab | 1769 | r = dns_packet_read_name(p, &name, true, NULL); |
74b2466e | 1770 | if (r < 0) |
e18a3c73 | 1771 | return r; |
74b2466e | 1772 | |
faa133f3 | 1773 | r = dns_packet_read_uint16(p, &type, NULL); |
74b2466e | 1774 | if (r < 0) |
e18a3c73 | 1775 | return r; |
74b2466e | 1776 | |
faa133f3 | 1777 | r = dns_packet_read_uint16(p, &class, NULL); |
74b2466e | 1778 | if (r < 0) |
e18a3c73 | 1779 | return r; |
74b2466e | 1780 | |
23502de3 | 1781 | if (p->protocol == DNS_PROTOCOL_MDNS) { |
82d39576 | 1782 | /* See RFC6762, sections 5.4 and 10.2 */ |
23502de3 | 1783 | |
82d39576 SB |
1784 | if (type != DNS_TYPE_OPT && (class & MDNS_RR_CACHE_FLUSH_OR_QU)) { |
1785 | class &= ~MDNS_RR_CACHE_FLUSH_OR_QU; | |
1786 | cache_flush_or_qu = true; | |
d2579eec | 1787 | } |
23502de3 DM |
1788 | } |
1789 | ||
81b4d94d LP |
1790 | if (ret) { |
1791 | DnsResourceKey *key; | |
faa133f3 | 1792 | |
81b4d94d LP |
1793 | key = dns_resource_key_new_consume(class, type, name); |
1794 | if (!key) | |
1795 | return -ENOMEM; | |
1796 | ||
1797 | TAKE_PTR(name); | |
1798 | *ret = key; | |
1799 | } | |
74b2466e | 1800 | |
82d39576 SB |
1801 | if (ret_cache_flush_or_qu) |
1802 | *ret_cache_flush_or_qu = cache_flush_or_qu; | |
81b4d94d LP |
1803 | if (ret_start) |
1804 | *ret_start = rewinder.saved_rindex; | |
74b2466e | 1805 | |
81b4d94d | 1806 | CANCEL_REWINDER(rewinder); |
74b2466e | 1807 | return 0; |
74b2466e LP |
1808 | } |
1809 | ||
afbc4f26 ZJS |
1810 | static bool loc_size_ok(uint8_t size) { |
1811 | uint8_t m = size >> 4, e = size & 0xF; | |
1812 | ||
1813 | return m <= 9 && e <= 9 && (m > 0 || e == 0); | |
1814 | } | |
1815 | ||
e7634d6b RP |
1816 | static bool dns_svc_param_is_valid(DnsSvcParam *i) { |
1817 | if (!i) | |
1818 | return false; | |
1819 | ||
1820 | switch (i->key) { | |
1821 | /* RFC 9460, section 7.1.1: alpn-ids must exactly fill SvcParamValue */ | |
1822 | case DNS_SVC_PARAM_KEY_ALPN: { | |
1823 | size_t sz = 0; | |
1824 | if (i->length <= 0) | |
1825 | return false; | |
1826 | while (sz < i->length) | |
1827 | sz += 1 + i->value[sz]; /* N.B. will not overflow */ | |
1828 | return sz == i->length; | |
1829 | } | |
1830 | ||
1831 | /* RFC 9460, section 7.1.1: value must be empty */ | |
1832 | case DNS_SVC_PARAM_KEY_NO_DEFAULT_ALPN: | |
1833 | return i->length == 0; | |
1834 | ||
1835 | /* RFC 9460, section 7.2 */ | |
1836 | case DNS_SVC_PARAM_KEY_PORT: | |
1837 | return i->length == 2; | |
1838 | ||
1839 | /* RFC 9460, section 7.3: addrs must exactly fill SvcParamValue */ | |
1840 | case DNS_SVC_PARAM_KEY_IPV4HINT: | |
26551c0f | 1841 | return i->length > 0 && i->length % (sizeof (struct in_addr)) == 0; |
e7634d6b | 1842 | case DNS_SVC_PARAM_KEY_IPV6HINT: |
26551c0f | 1843 | return i->length > 0 && i->length % (sizeof (struct in6_addr)) == 0; |
e7634d6b RP |
1844 | |
1845 | /* Otherwise, permit any value */ | |
1846 | default: | |
1847 | return true; | |
1848 | } | |
1849 | } | |
1850 | ||
81b4d94d LP |
1851 | int dns_packet_read_rr( |
1852 | DnsPacket *p, | |
1853 | DnsResourceRecord **ret, | |
1854 | bool *ret_cache_flush, | |
1855 | size_t *ret_start) { | |
1856 | ||
0c4f37f0 ZJS |
1857 | assert(p); |
1858 | ||
1859 | _cleanup_(rewind_dns_packet) DnsPacketRewinder rewinder = REWINDER_INIT(p); | |
faa133f3 LP |
1860 | _cleanup_(dns_resource_record_unrefp) DnsResourceRecord *rr = NULL; |
1861 | _cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL; | |
e18a3c73 | 1862 | size_t offset; |
74b2466e | 1863 | uint16_t rdlength; |
d2579eec | 1864 | bool cache_flush; |
74b2466e LP |
1865 | int r; |
1866 | ||
d2579eec | 1867 | r = dns_packet_read_key(p, &key, &cache_flush, NULL); |
74b2466e | 1868 | if (r < 0) |
e18a3c73 | 1869 | return r; |
74b2466e | 1870 | |
e18a3c73 ZJS |
1871 | if (!dns_class_is_valid_rr(key->class) || !dns_type_is_valid_rr(key->type)) |
1872 | return -EBADMSG; | |
0e2bcd6a | 1873 | |
faa133f3 | 1874 | rr = dns_resource_record_new(key); |
e18a3c73 ZJS |
1875 | if (!rr) |
1876 | return -ENOMEM; | |
faa133f3 | 1877 | |
74b2466e LP |
1878 | r = dns_packet_read_uint32(p, &rr->ttl, NULL); |
1879 | if (r < 0) | |
e18a3c73 | 1880 | return r; |
74b2466e | 1881 | |
13178797 | 1882 | /* RFC 2181, Section 8, suggests to treat a TTL with the MSB set as a zero TTL. We avoid doing this |
d7306348 | 1883 | * for OPT records so that all 8 bits of the extended RCODE may be used. */ |
13178797 | 1884 | if (key->type != DNS_TYPE_OPT && rr->ttl & UINT32_C(0x80000000)) |
0d0b52d7 LP |
1885 | rr->ttl = 0; |
1886 | ||
74b2466e LP |
1887 | r = dns_packet_read_uint16(p, &rdlength, NULL); |
1888 | if (r < 0) | |
e18a3c73 | 1889 | return r; |
74b2466e | 1890 | |
370999c0 | 1891 | if (rdlength > p->size - p->rindex) |
e18a3c73 | 1892 | return -EBADMSG; |
74b2466e LP |
1893 | |
1894 | offset = p->rindex; | |
1895 | ||
faa133f3 | 1896 | switch (rr->key->type) { |
74b2466e | 1897 | |
9c92ce6d LP |
1898 | case DNS_TYPE_SRV: |
1899 | r = dns_packet_read_uint16(p, &rr->srv.priority, NULL); | |
1900 | if (r < 0) | |
e18a3c73 | 1901 | return r; |
9c92ce6d LP |
1902 | r = dns_packet_read_uint16(p, &rr->srv.weight, NULL); |
1903 | if (r < 0) | |
e18a3c73 | 1904 | return r; |
9c92ce6d LP |
1905 | r = dns_packet_read_uint16(p, &rr->srv.port, NULL); |
1906 | if (r < 0) | |
e18a3c73 | 1907 | return r; |
d9a55740 LP |
1908 | |
1909 | /* RFC 2782 states "Unless and until permitted by future standards action, name compression | |
1910 | * is not to be used for this field." Nonetheless, we support it here, in the interest of | |
1911 | * increasing compatibility with implementations that do not implement this correctly. After | |
1912 | * all we didn't do this right once upon a time ourselves (see | |
1913 | * https://github.com/systemd/systemd/issues/9793). */ | |
1914 | r = dns_packet_read_name(p, &rr->srv.name, /* allow_compression= */ true, NULL); | |
9c92ce6d LP |
1915 | break; |
1916 | ||
74b2466e LP |
1917 | case DNS_TYPE_PTR: |
1918 | case DNS_TYPE_NS: | |
1919 | case DNS_TYPE_CNAME: | |
8ac4e9e1 | 1920 | case DNS_TYPE_DNAME: |
151226ab | 1921 | r = dns_packet_read_name(p, &rr->ptr.name, true, NULL); |
74b2466e LP |
1922 | break; |
1923 | ||
1924 | case DNS_TYPE_HINFO: | |
1925 | r = dns_packet_read_string(p, &rr->hinfo.cpu, NULL); | |
1926 | if (r < 0) | |
e18a3c73 | 1927 | return r; |
74b2466e LP |
1928 | |
1929 | r = dns_packet_read_string(p, &rr->hinfo.os, NULL); | |
1930 | break; | |
1931 | ||
9de3e329 | 1932 | case DNS_TYPE_SPF: /* exactly the same as TXT */ |
1ccda9b7 LP |
1933 | case DNS_TYPE_TXT: |
1934 | if (rdlength <= 0) { | |
ebb779dc DR |
1935 | r = dns_txt_item_new_empty(&rr->txt.items); |
1936 | if (r < 0) | |
1937 | return r; | |
1ccda9b7 | 1938 | } else { |
2001c805 LP |
1939 | DnsTxtItem *last = NULL; |
1940 | ||
370999c0 | 1941 | while (p->rindex - offset < rdlength) { |
2001c805 LP |
1942 | DnsTxtItem *i; |
1943 | const void *data; | |
1944 | size_t sz; | |
2e276efc | 1945 | |
2001c805 | 1946 | r = dns_packet_read_raw_string(p, &data, &sz, NULL); |
1ccda9b7 | 1947 | if (r < 0) |
2001c805 | 1948 | return r; |
1ccda9b7 | 1949 | |
2001c805 LP |
1950 | i = malloc0(offsetof(DnsTxtItem, data) + sz + 1); /* extra NUL byte at the end */ |
1951 | if (!i) | |
1952 | return -ENOMEM; | |
1953 | ||
1954 | memcpy(i->data, data, sz); | |
1955 | i->length = sz; | |
1956 | ||
1957 | LIST_INSERT_AFTER(items, rr->txt.items, last, i); | |
1958 | last = i; | |
1ccda9b7 | 1959 | } |
6a6fc3df LP |
1960 | } |
1961 | ||
1962 | r = 0; | |
2e276efc | 1963 | break; |
2e276efc | 1964 | |
74b2466e | 1965 | case DNS_TYPE_A: |
623a4c97 | 1966 | r = dns_packet_read_blob(p, &rr->a.in_addr, sizeof(struct in_addr), NULL); |
74b2466e LP |
1967 | break; |
1968 | ||
1969 | case DNS_TYPE_AAAA: | |
623a4c97 | 1970 | r = dns_packet_read_blob(p, &rr->aaaa.in6_addr, sizeof(struct in6_addr), NULL); |
74b2466e LP |
1971 | break; |
1972 | ||
7e8e0422 | 1973 | case DNS_TYPE_SOA: |
151226ab | 1974 | r = dns_packet_read_name(p, &rr->soa.mname, true, NULL); |
7e8e0422 | 1975 | if (r < 0) |
e18a3c73 | 1976 | return r; |
7e8e0422 | 1977 | |
151226ab | 1978 | r = dns_packet_read_name(p, &rr->soa.rname, true, NULL); |
7e8e0422 | 1979 | if (r < 0) |
e18a3c73 | 1980 | return r; |
7e8e0422 LP |
1981 | |
1982 | r = dns_packet_read_uint32(p, &rr->soa.serial, NULL); | |
1983 | if (r < 0) | |
e18a3c73 | 1984 | return r; |
7e8e0422 LP |
1985 | |
1986 | r = dns_packet_read_uint32(p, &rr->soa.refresh, NULL); | |
1987 | if (r < 0) | |
e18a3c73 | 1988 | return r; |
7e8e0422 LP |
1989 | |
1990 | r = dns_packet_read_uint32(p, &rr->soa.retry, NULL); | |
1991 | if (r < 0) | |
e18a3c73 | 1992 | return r; |
7e8e0422 LP |
1993 | |
1994 | r = dns_packet_read_uint32(p, &rr->soa.expire, NULL); | |
1995 | if (r < 0) | |
e18a3c73 | 1996 | return r; |
7e8e0422 LP |
1997 | |
1998 | r = dns_packet_read_uint32(p, &rr->soa.minimum, NULL); | |
1999 | break; | |
2000 | ||
623a4c97 | 2001 | case DNS_TYPE_MX: |
946c7094 ZJS |
2002 | r = dns_packet_read_uint16(p, &rr->mx.priority, NULL); |
2003 | if (r < 0) | |
e18a3c73 | 2004 | return r; |
946c7094 | 2005 | |
151226ab | 2006 | r = dns_packet_read_name(p, &rr->mx.exchange, true, NULL); |
946c7094 ZJS |
2007 | break; |
2008 | ||
0dae31d4 ZJS |
2009 | case DNS_TYPE_LOC: { |
2010 | uint8_t t; | |
2011 | size_t pos; | |
2012 | ||
2013 | r = dns_packet_read_uint8(p, &t, &pos); | |
2014 | if (r < 0) | |
e18a3c73 | 2015 | return r; |
0dae31d4 ZJS |
2016 | |
2017 | if (t == 0) { | |
2018 | rr->loc.version = t; | |
2019 | ||
2020 | r = dns_packet_read_uint8(p, &rr->loc.size, NULL); | |
2021 | if (r < 0) | |
e18a3c73 | 2022 | return r; |
0dae31d4 | 2023 | |
e18a3c73 ZJS |
2024 | if (!loc_size_ok(rr->loc.size)) |
2025 | return -EBADMSG; | |
afbc4f26 | 2026 | |
0dae31d4 ZJS |
2027 | r = dns_packet_read_uint8(p, &rr->loc.horiz_pre, NULL); |
2028 | if (r < 0) | |
e18a3c73 | 2029 | return r; |
0dae31d4 | 2030 | |
e18a3c73 ZJS |
2031 | if (!loc_size_ok(rr->loc.horiz_pre)) |
2032 | return -EBADMSG; | |
afbc4f26 | 2033 | |
0dae31d4 ZJS |
2034 | r = dns_packet_read_uint8(p, &rr->loc.vert_pre, NULL); |
2035 | if (r < 0) | |
e18a3c73 | 2036 | return r; |
0dae31d4 | 2037 | |
e18a3c73 ZJS |
2038 | if (!loc_size_ok(rr->loc.vert_pre)) |
2039 | return -EBADMSG; | |
afbc4f26 | 2040 | |
0dae31d4 ZJS |
2041 | r = dns_packet_read_uint32(p, &rr->loc.latitude, NULL); |
2042 | if (r < 0) | |
e18a3c73 | 2043 | return r; |
0dae31d4 ZJS |
2044 | |
2045 | r = dns_packet_read_uint32(p, &rr->loc.longitude, NULL); | |
2046 | if (r < 0) | |
e18a3c73 | 2047 | return r; |
0dae31d4 ZJS |
2048 | |
2049 | r = dns_packet_read_uint32(p, &rr->loc.altitude, NULL); | |
2050 | if (r < 0) | |
e18a3c73 | 2051 | return r; |
0dae31d4 ZJS |
2052 | |
2053 | break; | |
2054 | } else { | |
2055 | dns_packet_rewind(p, pos); | |
52e085af ZJS |
2056 | rr->unparsable = true; |
2057 | goto unparsable; | |
0dae31d4 ZJS |
2058 | } |
2059 | } | |
2060 | ||
abf126a3 TG |
2061 | case DNS_TYPE_DS: |
2062 | r = dns_packet_read_uint16(p, &rr->ds.key_tag, NULL); | |
2063 | if (r < 0) | |
e18a3c73 | 2064 | return r; |
abf126a3 TG |
2065 | |
2066 | r = dns_packet_read_uint8(p, &rr->ds.algorithm, NULL); | |
2067 | if (r < 0) | |
e18a3c73 | 2068 | return r; |
abf126a3 TG |
2069 | |
2070 | r = dns_packet_read_uint8(p, &rr->ds.digest_type, NULL); | |
2071 | if (r < 0) | |
e18a3c73 | 2072 | return r; |
abf126a3 | 2073 | |
8a0f6d1f SL |
2074 | if (rdlength < 4) |
2075 | return -EBADMSG; | |
2076 | ||
f5430a3e LP |
2077 | r = dns_packet_read_memdup(p, rdlength - 4, |
2078 | &rr->ds.digest, &rr->ds.digest_size, | |
2079 | NULL); | |
abf126a3 | 2080 | if (r < 0) |
e18a3c73 | 2081 | return r; |
abf126a3 | 2082 | |
e18a3c73 | 2083 | if (rr->ds.digest_size <= 0) |
f1d178cc TG |
2084 | /* the accepted size depends on the algorithm, but for now |
2085 | just ensure that the value is greater than zero */ | |
e18a3c73 | 2086 | return -EBADMSG; |
f1d178cc | 2087 | |
abf126a3 | 2088 | break; |
d75acfb0 | 2089 | |
623a4c97 | 2090 | case DNS_TYPE_SSHFP: |
42cc2eeb LP |
2091 | r = dns_packet_read_uint8(p, &rr->sshfp.algorithm, NULL); |
2092 | if (r < 0) | |
e18a3c73 | 2093 | return r; |
42cc2eeb LP |
2094 | |
2095 | r = dns_packet_read_uint8(p, &rr->sshfp.fptype, NULL); | |
2096 | if (r < 0) | |
e18a3c73 | 2097 | return r; |
42cc2eeb | 2098 | |
8a0f6d1f SL |
2099 | if (rdlength < 2) |
2100 | return -EBADMSG; | |
2101 | ||
f5430a3e | 2102 | r = dns_packet_read_memdup(p, rdlength - 2, |
549c1a25 | 2103 | &rr->sshfp.fingerprint, &rr->sshfp.fingerprint_size, |
f5430a3e | 2104 | NULL); |
f1d178cc | 2105 | |
e18a3c73 | 2106 | if (rr->sshfp.fingerprint_size <= 0) |
f1d178cc TG |
2107 | /* the accepted size depends on the algorithm, but for now |
2108 | just ensure that the value is greater than zero */ | |
e18a3c73 | 2109 | return -EBADMSG; |
f1d178cc | 2110 | |
8db0d2f5 ZJS |
2111 | break; |
2112 | ||
f91dc240 LP |
2113 | case DNS_TYPE_DNSKEY: |
2114 | r = dns_packet_read_uint16(p, &rr->dnskey.flags, NULL); | |
8db0d2f5 | 2115 | if (r < 0) |
e18a3c73 | 2116 | return r; |
8db0d2f5 | 2117 | |
f91dc240 | 2118 | r = dns_packet_read_uint8(p, &rr->dnskey.protocol, NULL); |
8db0d2f5 | 2119 | if (r < 0) |
e18a3c73 | 2120 | return r; |
8db0d2f5 | 2121 | |
8db0d2f5 ZJS |
2122 | r = dns_packet_read_uint8(p, &rr->dnskey.algorithm, NULL); |
2123 | if (r < 0) | |
e18a3c73 | 2124 | return r; |
8db0d2f5 | 2125 | |
8a0f6d1f SL |
2126 | if (rdlength < 4) |
2127 | return -EBADMSG; | |
2128 | ||
f5430a3e LP |
2129 | r = dns_packet_read_memdup(p, rdlength - 4, |
2130 | &rr->dnskey.key, &rr->dnskey.key_size, | |
2131 | NULL); | |
f1d178cc | 2132 | |
e18a3c73 | 2133 | if (rr->dnskey.key_size <= 0) |
f1d178cc TG |
2134 | /* the accepted size depends on the algorithm, but for now |
2135 | just ensure that the value is greater than zero */ | |
e18a3c73 | 2136 | return -EBADMSG; |
f1d178cc | 2137 | |
42cc2eeb LP |
2138 | break; |
2139 | ||
151226ab ZJS |
2140 | case DNS_TYPE_RRSIG: |
2141 | r = dns_packet_read_uint16(p, &rr->rrsig.type_covered, NULL); | |
2142 | if (r < 0) | |
e18a3c73 | 2143 | return r; |
151226ab ZJS |
2144 | |
2145 | r = dns_packet_read_uint8(p, &rr->rrsig.algorithm, NULL); | |
2146 | if (r < 0) | |
e18a3c73 | 2147 | return r; |
151226ab ZJS |
2148 | |
2149 | r = dns_packet_read_uint8(p, &rr->rrsig.labels, NULL); | |
2150 | if (r < 0) | |
e18a3c73 | 2151 | return r; |
151226ab ZJS |
2152 | |
2153 | r = dns_packet_read_uint32(p, &rr->rrsig.original_ttl, NULL); | |
2154 | if (r < 0) | |
e18a3c73 | 2155 | return r; |
151226ab ZJS |
2156 | |
2157 | r = dns_packet_read_uint32(p, &rr->rrsig.expiration, NULL); | |
2158 | if (r < 0) | |
e18a3c73 | 2159 | return r; |
151226ab ZJS |
2160 | |
2161 | r = dns_packet_read_uint32(p, &rr->rrsig.inception, NULL); | |
2162 | if (r < 0) | |
e18a3c73 | 2163 | return r; |
151226ab ZJS |
2164 | |
2165 | r = dns_packet_read_uint16(p, &rr->rrsig.key_tag, NULL); | |
2166 | if (r < 0) | |
e18a3c73 | 2167 | return r; |
151226ab ZJS |
2168 | |
2169 | r = dns_packet_read_name(p, &rr->rrsig.signer, false, NULL); | |
2170 | if (r < 0) | |
e18a3c73 | 2171 | return r; |
151226ab | 2172 | |
370999c0 | 2173 | if (rdlength < p->rindex - offset) |
8a0f6d1f SL |
2174 | return -EBADMSG; |
2175 | ||
f5430a3e LP |
2176 | r = dns_packet_read_memdup(p, offset + rdlength - p->rindex, |
2177 | &rr->rrsig.signature, &rr->rrsig.signature_size, | |
2178 | NULL); | |
f1d178cc | 2179 | |
e18a3c73 | 2180 | if (rr->rrsig.signature_size <= 0) |
f1d178cc TG |
2181 | /* the accepted size depends on the algorithm, but for now |
2182 | just ensure that the value is greater than zero */ | |
e18a3c73 | 2183 | return -EBADMSG; |
f1d178cc | 2184 | |
151226ab ZJS |
2185 | break; |
2186 | ||
d84e543d DM |
2187 | case DNS_TYPE_NSEC: { |
2188 | ||
2189 | /* | |
5238e957 | 2190 | * RFC6762, section 18.14 explicitly states mDNS should use name compression. |
d84e543d DM |
2191 | * This contradicts RFC3845, section 2.1.1 |
2192 | */ | |
2193 | ||
2194 | bool allow_compressed = p->protocol == DNS_PROTOCOL_MDNS; | |
2195 | ||
2196 | r = dns_packet_read_name(p, &rr->nsec.next_domain_name, allow_compressed, NULL); | |
50f1e641 | 2197 | if (r < 0) |
e18a3c73 | 2198 | return r; |
50f1e641 | 2199 | |
370999c0 YW |
2200 | if (rdlength < p->rindex - offset) |
2201 | return -EBADMSG; | |
2202 | ||
89492aaf | 2203 | r = dns_packet_read_type_windows(p, &rr->nsec.types, offset + rdlength - p->rindex, NULL); |
89492aaf | 2204 | |
09eaf68c TG |
2205 | /* We accept empty NSEC bitmaps. The bit indicating the presence of the NSEC record itself |
2206 | * is redundant and in e.g., RFC4956 this fact is used to define a use for NSEC records | |
2207 | * without the NSEC bit set. */ | |
50f1e641 TG |
2208 | |
2209 | break; | |
d84e543d | 2210 | } |
5d45a880 TG |
2211 | case DNS_TYPE_NSEC3: { |
2212 | uint8_t size; | |
2213 | ||
2214 | r = dns_packet_read_uint8(p, &rr->nsec3.algorithm, NULL); | |
2215 | if (r < 0) | |
e18a3c73 | 2216 | return r; |
5d45a880 TG |
2217 | |
2218 | r = dns_packet_read_uint8(p, &rr->nsec3.flags, NULL); | |
2219 | if (r < 0) | |
e18a3c73 | 2220 | return r; |
5d45a880 TG |
2221 | |
2222 | r = dns_packet_read_uint16(p, &rr->nsec3.iterations, NULL); | |
2223 | if (r < 0) | |
e18a3c73 | 2224 | return r; |
5d45a880 | 2225 | |
f1d178cc | 2226 | /* this may be zero */ |
5d45a880 TG |
2227 | r = dns_packet_read_uint8(p, &size, NULL); |
2228 | if (r < 0) | |
e18a3c73 | 2229 | return r; |
5d45a880 | 2230 | |
f5430a3e | 2231 | r = dns_packet_read_memdup(p, size, &rr->nsec3.salt, &rr->nsec3.salt_size, NULL); |
5d45a880 | 2232 | if (r < 0) |
e18a3c73 | 2233 | return r; |
5d45a880 | 2234 | |
5d45a880 TG |
2235 | r = dns_packet_read_uint8(p, &size, NULL); |
2236 | if (r < 0) | |
e18a3c73 | 2237 | return r; |
5d45a880 | 2238 | |
e18a3c73 ZJS |
2239 | if (size <= 0) |
2240 | return -EBADMSG; | |
f1d178cc | 2241 | |
e18a3c73 ZJS |
2242 | r = dns_packet_read_memdup(p, size, |
2243 | &rr->nsec3.next_hashed_name, &rr->nsec3.next_hashed_name_size, | |
2244 | NULL); | |
5d45a880 | 2245 | if (r < 0) |
e18a3c73 | 2246 | return r; |
5d45a880 | 2247 | |
370999c0 YW |
2248 | if (rdlength < p->rindex - offset) |
2249 | return -EBADMSG; | |
2250 | ||
6b9308d1 | 2251 | r = dns_packet_read_type_windows(p, &rr->nsec3.types, offset + rdlength - p->rindex, NULL); |
5d45a880 | 2252 | |
0bbd72b2 TG |
2253 | /* empty non-terminals can have NSEC3 records, so empty bitmaps are allowed */ |
2254 | ||
5d45a880 TG |
2255 | break; |
2256 | } | |
d75acfb0 | 2257 | |
48d45d2b ZJS |
2258 | case DNS_TYPE_TLSA: |
2259 | r = dns_packet_read_uint8(p, &rr->tlsa.cert_usage, NULL); | |
2260 | if (r < 0) | |
e18a3c73 | 2261 | return r; |
48d45d2b ZJS |
2262 | |
2263 | r = dns_packet_read_uint8(p, &rr->tlsa.selector, NULL); | |
2264 | if (r < 0) | |
e18a3c73 | 2265 | return r; |
48d45d2b ZJS |
2266 | |
2267 | r = dns_packet_read_uint8(p, &rr->tlsa.matching_type, NULL); | |
2268 | if (r < 0) | |
e18a3c73 | 2269 | return r; |
48d45d2b | 2270 | |
8a0f6d1f SL |
2271 | if (rdlength < 3) |
2272 | return -EBADMSG; | |
2273 | ||
48d45d2b ZJS |
2274 | r = dns_packet_read_memdup(p, rdlength - 3, |
2275 | &rr->tlsa.data, &rr->tlsa.data_size, | |
2276 | NULL); | |
e18a3c73 ZJS |
2277 | |
2278 | if (rr->tlsa.data_size <= 0) | |
48d45d2b ZJS |
2279 | /* the accepted size depends on the algorithm, but for now |
2280 | just ensure that the value is greater than zero */ | |
e18a3c73 | 2281 | return -EBADMSG; |
48d45d2b ZJS |
2282 | |
2283 | break; | |
2284 | ||
e7634d6b RP |
2285 | case DNS_TYPE_SVCB: |
2286 | case DNS_TYPE_HTTPS: | |
2287 | r = dns_packet_read_uint16(p, &rr->svcb.priority, NULL); | |
2288 | if (r < 0) | |
2289 | return r; | |
2290 | ||
2291 | r = dns_packet_read_name(p, &rr->svcb.target_name, false /* uncompressed */, NULL); | |
2292 | if (r < 0) | |
2293 | return r; | |
2294 | ||
2295 | DnsSvcParam *last = NULL; | |
2296 | while (p->rindex - offset < rdlength) { | |
2297 | _cleanup_free_ DnsSvcParam *i = NULL; | |
2298 | uint16_t svc_param_key; | |
2299 | uint16_t sz; | |
2300 | ||
2301 | r = dns_packet_read_uint16(p, &svc_param_key, NULL); | |
2302 | if (r < 0) | |
2303 | return r; | |
2304 | /* RFC 9460, section 2.2 says we must consider an RR malformed if SvcParamKeys are | |
2305 | * not in strictly increasing order */ | |
2306 | if (last && last->key >= svc_param_key) | |
2307 | return -EBADMSG; | |
2308 | ||
2309 | r = dns_packet_read_uint16(p, &sz, NULL); | |
2310 | if (r < 0) | |
2311 | return r; | |
2312 | ||
2313 | i = malloc0(offsetof(DnsSvcParam, value) + sz); | |
2314 | if (!i) | |
2315 | return -ENOMEM; | |
2316 | ||
2317 | i->key = svc_param_key; | |
2318 | i->length = sz; | |
2319 | r = dns_packet_read_blob(p, &i->value, sz, NULL); | |
2320 | if (r < 0) | |
2321 | return r; | |
2322 | if (!dns_svc_param_is_valid(i)) | |
2323 | return -EBADMSG; | |
2324 | ||
2325 | LIST_INSERT_AFTER(params, rr->svcb.params, last, i); | |
2326 | last = TAKE_PTR(i); | |
2327 | } | |
2328 | ||
2329 | break; | |
2330 | ||
95052df3 ZJS |
2331 | case DNS_TYPE_CAA: |
2332 | r = dns_packet_read_uint8(p, &rr->caa.flags, NULL); | |
2333 | if (r < 0) | |
2334 | return r; | |
2335 | ||
2336 | r = dns_packet_read_string(p, &rr->caa.tag, NULL); | |
2337 | if (r < 0) | |
2338 | return r; | |
2339 | ||
370999c0 | 2340 | if (rdlength < p->rindex - offset) |
8a0f6d1f SL |
2341 | return -EBADMSG; |
2342 | ||
95052df3 ZJS |
2343 | r = dns_packet_read_memdup(p, |
2344 | rdlength + offset - p->rindex, | |
2345 | &rr->caa.value, &rr->caa.value_size, NULL); | |
48d45d2b ZJS |
2346 | |
2347 | break; | |
2348 | ||
17615676 LP |
2349 | case DNS_TYPE_NAPTR: |
2350 | r = dns_packet_read_uint16(p, &rr->naptr.order, NULL); | |
2351 | if (r < 0) | |
2352 | return r; | |
2353 | ||
2354 | r = dns_packet_read_uint16(p, &rr->naptr.preference, NULL); | |
2355 | if (r < 0) | |
2356 | return r; | |
2357 | ||
2358 | r = dns_packet_read_string(p, &rr->naptr.flags, NULL); | |
2359 | if (r < 0) | |
2360 | return r; | |
2361 | ||
2362 | r = dns_packet_read_string(p, &rr->naptr.services, NULL); | |
2363 | if (r < 0) | |
2364 | return r; | |
2365 | ||
2366 | r = dns_packet_read_string(p, &rr->naptr.regexp, NULL); | |
2367 | if (r < 0) | |
2368 | return r; | |
2369 | ||
160159a7 | 2370 | r = dns_packet_read_name(p, &rr->naptr.replacement, /* allow_compression= */ false, NULL); |
17615676 LP |
2371 | break; |
2372 | ||
d75acfb0 | 2373 | case DNS_TYPE_OPT: /* we only care about the header of OPT for now. */ |
d93a16b8 | 2374 | case DNS_TYPE_OPENPGPKEY: |
74b2466e | 2375 | default: |
52e085af | 2376 | unparsable: |
a43a068a | 2377 | r = dns_packet_read_memdup(p, rdlength, &rr->generic.data, &rr->generic.data_size, NULL); |
74b2466e LP |
2378 | } |
2379 | if (r < 0) | |
e18a3c73 | 2380 | return r; |
370999c0 | 2381 | if (p->rindex - offset != rdlength) |
e18a3c73 | 2382 | return -EBADMSG; |
74b2466e | 2383 | |
81b4d94d LP |
2384 | if (ret) |
2385 | *ret = TAKE_PTR(rr); | |
d2579eec LP |
2386 | if (ret_cache_flush) |
2387 | *ret_cache_flush = cache_flush; | |
81b4d94d LP |
2388 | if (ret_start) |
2389 | *ret_start = rewinder.saved_rindex; | |
74b2466e | 2390 | |
81b4d94d | 2391 | CANCEL_REWINDER(rewinder); |
74b2466e | 2392 | return 0; |
74b2466e LP |
2393 | } |
2394 | ||
c3f7000e LP |
2395 | static bool opt_is_good(DnsResourceRecord *rr, bool *rfc6975) { |
2396 | const uint8_t* p; | |
2397 | bool found_dau_dhu_n3u = false; | |
2398 | size_t l; | |
2399 | ||
2400 | /* Checks whether the specified OPT RR is well-formed and whether it contains RFC6975 data (which is not OK in | |
2401 | * a reply). */ | |
2402 | ||
2403 | assert(rr); | |
2404 | assert(rr->key->type == DNS_TYPE_OPT); | |
2405 | ||
2406 | /* Check that the version is 0 */ | |
b30bf55d LP |
2407 | if (((rr->ttl >> 16) & UINT32_C(0xFF)) != 0) { |
2408 | *rfc6975 = false; | |
2409 | return true; /* if it's not version 0, it's OK, but we will ignore the OPT field contents */ | |
2410 | } | |
c3f7000e LP |
2411 | |
2412 | p = rr->opt.data; | |
a43a068a | 2413 | l = rr->opt.data_size; |
c3f7000e LP |
2414 | while (l > 0) { |
2415 | uint16_t option_code, option_length; | |
2416 | ||
2417 | /* At least four bytes for OPTION-CODE and OPTION-LENGTH are required */ | |
2418 | if (l < 4U) | |
2419 | return false; | |
2420 | ||
2421 | option_code = unaligned_read_be16(p); | |
2422 | option_length = unaligned_read_be16(p + 2); | |
2423 | ||
2424 | if (l < option_length + 4U) | |
2425 | return false; | |
2426 | ||
2427 | /* RFC 6975 DAU, DHU or N3U fields found. */ | |
980cb160 | 2428 | if (IN_SET(option_code, DNS_EDNS_OPT_DAU, DNS_EDNS_OPT_DHU, DNS_EDNS_OPT_N3U)) |
c3f7000e LP |
2429 | found_dau_dhu_n3u = true; |
2430 | ||
2431 | p += option_length + 4U; | |
2432 | l -= option_length + 4U; | |
2433 | } | |
2434 | ||
2435 | *rfc6975 = found_dau_dhu_n3u; | |
2436 | return true; | |
2437 | } | |
2438 | ||
4a49e560 | 2439 | static int dns_packet_extract_question(DnsPacket *p, DnsQuestion **ret_question) { |
faa133f3 | 2440 | _cleanup_(dns_question_unrefp) DnsQuestion *question = NULL; |
64ea42e9 | 2441 | unsigned n; |
74b2466e LP |
2442 | int r; |
2443 | ||
3cb10d3a | 2444 | n = DNS_PACKET_QDCOUNT(p); |
faa133f3 LP |
2445 | if (n > 0) { |
2446 | question = dns_question_new(n); | |
e18a3c73 ZJS |
2447 | if (!question) |
2448 | return -ENOMEM; | |
74b2466e | 2449 | |
2d34cf0c ZJS |
2450 | _cleanup_set_free_ Set *keys = NULL; /* references to keys are kept by Question */ |
2451 | ||
2452 | keys = set_new(&dns_resource_key_hash_ops); | |
2453 | if (!keys) | |
2454 | return log_oom(); | |
2455 | ||
2456 | r = set_reserve(keys, n * 2); /* Higher multipliers give slightly higher efficiency through | |
e9665ac2 | 2457 | * hash collisions, but the gains quickly drop off after 2. */ |
2d34cf0c ZJS |
2458 | if (r < 0) |
2459 | return r; | |
2460 | ||
64ea42e9 | 2461 | for (unsigned i = 0; i < n; i++) { |
faa133f3 | 2462 | _cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL; |
82d39576 | 2463 | bool qu; |
74b2466e | 2464 | |
82d39576 | 2465 | r = dns_packet_read_key(p, &key, &qu, NULL); |
faa133f3 | 2466 | if (r < 0) |
e18a3c73 | 2467 | return r; |
74b2466e | 2468 | |
e18a3c73 ZJS |
2469 | if (!dns_type_is_valid_query(key->type)) |
2470 | return -EBADMSG; | |
c463eb78 | 2471 | |
2d34cf0c ZJS |
2472 | r = set_put(keys, key); |
2473 | if (r < 0) | |
2474 | return r; | |
2475 | if (r == 0) | |
2476 | /* Already in the Question, let's skip */ | |
2477 | continue; | |
2478 | ||
82d39576 | 2479 | r = dns_question_add_raw(question, key, qu ? DNS_QUESTION_WANTS_UNICAST_REPLY : 0); |
faa133f3 | 2480 | if (r < 0) |
e18a3c73 | 2481 | return r; |
faa133f3 LP |
2482 | } |
2483 | } | |
322345fd | 2484 | |
1cc6c93a YW |
2485 | *ret_question = TAKE_PTR(question); |
2486 | ||
4a49e560 ZJS |
2487 | return 0; |
2488 | } | |
2489 | ||
2490 | static int dns_packet_extract_answer(DnsPacket *p, DnsAnswer **ret_answer) { | |
2491 | _cleanup_(dns_answer_unrefp) DnsAnswer *answer = NULL; | |
64ea42e9 | 2492 | unsigned n; |
4a49e560 ZJS |
2493 | _cleanup_(dns_resource_record_unrefp) DnsResourceRecord *previous = NULL; |
2494 | bool bad_opt = false; | |
2495 | int r; | |
2496 | ||
faa133f3 | 2497 | n = DNS_PACKET_RRCOUNT(p); |
4a49e560 ZJS |
2498 | if (n == 0) |
2499 | return 0; | |
c3f7000e | 2500 | |
4a49e560 ZJS |
2501 | answer = dns_answer_new(n); |
2502 | if (!answer) | |
2503 | return -ENOMEM; | |
322345fd | 2504 | |
64ea42e9 | 2505 | for (unsigned i = 0; i < n; i++) { |
4a49e560 ZJS |
2506 | _cleanup_(dns_resource_record_unrefp) DnsResourceRecord *rr = NULL; |
2507 | bool cache_flush = false; | |
93748b26 | 2508 | size_t start; |
322345fd | 2509 | |
729c5deb | 2510 | if (p->rindex == p->size && p->opt) { |
18674159 LP |
2511 | /* If we reached the end of the packet already, but there are still more RRs |
2512 | * declared, then that's a corrupt packet. Let's accept the packet anyway, since it's | |
2513 | * apparently a common bug in routers. Let's however suppress OPT support in this | |
2514 | * case, so that we force the rest of the logic into lowest DNS baseline support. Or | |
2515 | * to say this differently: if the DNS server doesn't even get the RR counts right, | |
2516 | * it's highly unlikely it gets EDNS right. */ | |
2517 | log_debug("More resource records declared in packet than included, suppressing OPT."); | |
2518 | bad_opt = true; | |
2519 | break; | |
2520 | } | |
2521 | ||
93748b26 | 2522 | r = dns_packet_read_rr(p, &rr, &cache_flush, &start); |
4a49e560 ZJS |
2523 | if (r < 0) |
2524 | return r; | |
322345fd | 2525 | |
4a49e560 ZJS |
2526 | /* Try to reduce memory usage a bit */ |
2527 | if (previous) | |
2528 | dns_resource_key_reduce(&rr->key, &previous->key); | |
f57e3cd5 | 2529 | |
4a49e560 ZJS |
2530 | if (rr->key->type == DNS_TYPE_OPT) { |
2531 | bool has_rfc6975; | |
c3f7000e | 2532 | |
4a49e560 ZJS |
2533 | if (p->opt || bad_opt) { |
2534 | /* Multiple OPT RRs? if so, let's ignore all, because there's | |
2535 | * something wrong with the server, and if one is valid we wouldn't | |
2536 | * know which one. */ | |
2537 | log_debug("Multiple OPT RRs detected, ignoring all."); | |
2538 | bad_opt = true; | |
2539 | continue; | |
2540 | } | |
e6b57b37 | 2541 | |
4a49e560 ZJS |
2542 | if (!dns_name_is_root(dns_resource_key_name(rr->key))) { |
2543 | /* If the OPT RR is not owned by the root domain, then it is bad, | |
2544 | * let's ignore it. */ | |
2545 | log_debug("OPT RR is not owned by root domain, ignoring."); | |
2546 | bad_opt = true; | |
2547 | continue; | |
2548 | } | |
c3f7000e | 2549 | |
4a49e560 ZJS |
2550 | if (i < DNS_PACKET_ANCOUNT(p) + DNS_PACKET_NSCOUNT(p)) { |
2551 | /* OPT RR is in the wrong section? Some Belkin routers do this. This | |
2552 | * is a hint the EDNS implementation is borked, like the Belkin one | |
2553 | * is, hence ignore it. */ | |
2554 | log_debug("OPT RR in wrong section, ignoring."); | |
2555 | bad_opt = true; | |
2556 | continue; | |
2557 | } | |
2558 | ||
2559 | if (!opt_is_good(rr, &has_rfc6975)) { | |
2560 | log_debug("Malformed OPT RR, ignoring."); | |
2561 | bad_opt = true; | |
2562 | continue; | |
2563 | } | |
2564 | ||
2565 | if (DNS_PACKET_QR(p)) { | |
2566 | /* Additional checks for responses */ | |
2567 | ||
d7a0f1f4 | 2568 | if (!DNS_RESOURCE_RECORD_OPT_VERSION_SUPPORTED(rr)) |
4a49e560 ZJS |
2569 | /* If this is a reply and we don't know the EDNS version |
2570 | * then something is weird... */ | |
d7a0f1f4 FS |
2571 | return log_debug_errno(SYNTHETIC_ERRNO(EBADMSG), |
2572 | "EDNS version newer that our request, bad server."); | |
ff7febd5 | 2573 | |
4a49e560 ZJS |
2574 | if (has_rfc6975) { |
2575 | /* If the OPT RR contains RFC6975 algorithm data, then this | |
2576 | * is indication that the server just copied the OPT it got | |
2577 | * from us (which contained that data) back into the reply. | |
2578 | * If so, then it doesn't properly support EDNS, as RFC6975 | |
2579 | * makes it very clear that the algorithm data should only | |
2580 | * be contained in questions, never in replies. Crappy | |
2581 | * Belkin routers copy the OPT data for example, hence let's | |
2582 | * detect this so that we downgrade early. */ | |
dffb8277 | 2583 | log_debug("OPT RR contains RFC6975 data, ignoring."); |
c3f7000e LP |
2584 | bad_opt = true; |
2585 | continue; | |
2586 | } | |
4a49e560 | 2587 | } |
e6b57b37 | 2588 | |
4a49e560 | 2589 | p->opt = dns_resource_record_ref(rr); |
93748b26 LP |
2590 | p->opt_start = start; |
2591 | assert(p->rindex >= start); | |
2592 | p->opt_size = p->rindex - start; | |
4a49e560 | 2593 | } else { |
fa4e74b8 LP |
2594 | DnsAnswerFlags flags = 0; |
2595 | ||
8ec951e8 BP |
2596 | if (p->protocol == DNS_PROTOCOL_MDNS) { |
2597 | flags |= DNS_ANSWER_REFUSE_TTL_NO_MATCH; | |
2598 | if (!cache_flush) | |
2599 | flags |= DNS_ANSWER_SHARED_OWNER; | |
2600 | } | |
fa4e74b8 LP |
2601 | |
2602 | /* According to RFC 4795, section 2.9. only the RRs from the Answer section shall be | |
2603 | * cached. Hence mark only those RRs as cacheable by default, but not the ones from | |
82af03c2 VCS |
2604 | * the Additional or Authority sections. |
2605 | * This restriction does not apply to mDNS records (RFC 6762). */ | |
fa4e74b8 LP |
2606 | if (i < DNS_PACKET_ANCOUNT(p)) |
2607 | flags |= DNS_ANSWER_CACHEABLE|DNS_ANSWER_SECTION_ANSWER; | |
2608 | else if (i < DNS_PACKET_ANCOUNT(p) + DNS_PACKET_NSCOUNT(p)) | |
2609 | flags |= DNS_ANSWER_SECTION_AUTHORITY; | |
82af03c2 | 2610 | else { |
fa4e74b8 | 2611 | flags |= DNS_ANSWER_SECTION_ADDITIONAL; |
82af03c2 VCS |
2612 | if (p->protocol == DNS_PROTOCOL_MDNS) |
2613 | flags |= DNS_ANSWER_CACHEABLE; | |
2614 | } | |
4a49e560 | 2615 | |
04617bf8 | 2616 | r = dns_answer_add(answer, rr, p->ifindex, flags, NULL); |
4a49e560 ZJS |
2617 | if (r < 0) |
2618 | return r; | |
2619 | } | |
d75acfb0 | 2620 | |
b87fbe5f | 2621 | /* Remember this RR, so that we can potentially merge its ->key object with the |
4a49e560 ZJS |
2622 | * next RR. Note that we only do this if we actually decided to keep the RR around. |
2623 | */ | |
7daeec3e | 2624 | DNS_RR_REPLACE(previous, dns_resource_record_ref(rr)); |
4a49e560 | 2625 | } |
105e1512 | 2626 | |
18674159 | 2627 | if (bad_opt) { |
4a49e560 | 2628 | p->opt = dns_resource_record_unref(p->opt); |
18674159 LP |
2629 | p->opt_start = p->opt_size = SIZE_MAX; |
2630 | } | |
105e1512 | 2631 | |
1cc6c93a YW |
2632 | *ret_answer = TAKE_PTR(answer); |
2633 | ||
4a49e560 ZJS |
2634 | return 0; |
2635 | } | |
ebc8a106 | 2636 | |
4a49e560 | 2637 | int dns_packet_extract(DnsPacket *p) { |
0c4f37f0 | 2638 | assert(p); |
c3f7000e | 2639 | |
4a49e560 ZJS |
2640 | if (p->extracted) |
2641 | return 0; | |
2642 | ||
0c4f37f0 ZJS |
2643 | _cleanup_(dns_question_unrefp) DnsQuestion *question = NULL; |
2644 | _cleanup_(dns_answer_unrefp) DnsAnswer *answer = NULL; | |
fc44acc0 | 2645 | _unused_ _cleanup_(rewind_dns_packet) DnsPacketRewinder rewinder = REWINDER_INIT(p); |
0c4f37f0 ZJS |
2646 | int r; |
2647 | ||
4a49e560 ZJS |
2648 | dns_packet_rewind(p, DNS_PACKET_HEADER_SIZE); |
2649 | ||
2650 | r = dns_packet_extract_question(p, &question); | |
2651 | if (r < 0) | |
2652 | return r; | |
2653 | ||
2654 | r = dns_packet_extract_answer(p, &answer); | |
2655 | if (r < 0) | |
2656 | return r; | |
322345fd | 2657 | |
894c7b77 LP |
2658 | if (p->rindex < p->size) { |
2659 | log_debug("Trailing garbage in packet, suppressing OPT."); | |
2660 | p->opt = dns_resource_record_unref(p->opt); | |
2661 | p->opt_start = p->opt_size = SIZE_MAX; | |
2662 | } | |
2663 | ||
1cc6c93a YW |
2664 | p->question = TAKE_PTR(question); |
2665 | p->answer = TAKE_PTR(answer); | |
a4076574 LP |
2666 | p->extracted = true; |
2667 | ||
e18a3c73 ZJS |
2668 | /* no CANCEL, always rewind */ |
2669 | return 0; | |
322345fd LP |
2670 | } |
2671 | ||
8af5b883 LP |
2672 | int dns_packet_is_reply_for(DnsPacket *p, const DnsResourceKey *key) { |
2673 | int r; | |
2674 | ||
2675 | assert(p); | |
2676 | assert(key); | |
2677 | ||
2678 | /* Checks if the specified packet is a reply for the specified | |
2679 | * key and the specified key is the only one in the question | |
2680 | * section. */ | |
2681 | ||
2682 | if (DNS_PACKET_QR(p) != 1) | |
2683 | return 0; | |
2684 | ||
2685 | /* Let's unpack the packet, if that hasn't happened yet. */ | |
2686 | r = dns_packet_extract(p); | |
2687 | if (r < 0) | |
2688 | return r; | |
2689 | ||
a924f43f EV |
2690 | if (!p->question) |
2691 | return 0; | |
2692 | ||
8af5b883 LP |
2693 | if (p->question->n_keys != 1) |
2694 | return 0; | |
2695 | ||
ab715ddb | 2696 | return dns_resource_key_equal(dns_question_first_key(p->question), key); |
8af5b883 LP |
2697 | } |
2698 | ||
93748b26 LP |
2699 | int dns_packet_patch_max_udp_size(DnsPacket *p, uint16_t max_udp_size) { |
2700 | assert(p); | |
2701 | assert(max_udp_size >= DNS_PACKET_UNICAST_SIZE_MAX); | |
2702 | ||
f5fbe71d | 2703 | if (p->opt_start == SIZE_MAX) /* No OPT section, nothing to patch */ |
93748b26 LP |
2704 | return 0; |
2705 | ||
f5fbe71d | 2706 | assert(p->opt_size != SIZE_MAX); |
93748b26 LP |
2707 | assert(p->opt_size >= 5); |
2708 | ||
2709 | unaligned_write_be16(DNS_PACKET_DATA(p) + p->opt_start + 3, max_udp_size); | |
2710 | return 1; | |
2711 | } | |
2712 | ||
81b4d94d | 2713 | static int patch_rr(DnsPacket *p, usec_t age) { |
0c4f37f0 | 2714 | _cleanup_(rewind_dns_packet) DnsPacketRewinder rewinder = REWINDER_INIT(p); |
81b4d94d LP |
2715 | size_t ttl_index; |
2716 | uint32_t ttl; | |
2717 | uint16_t type, rdlength; | |
2718 | int r; | |
2719 | ||
0f1f933b | 2720 | /* Patches the RR at the current rindex, subtracts the specified time from the TTL */ |
81b4d94d LP |
2721 | |
2722 | r = dns_packet_read_name(p, NULL, true, NULL); | |
2723 | if (r < 0) | |
2724 | return r; | |
2725 | ||
2726 | r = dns_packet_read_uint16(p, &type, NULL); | |
2727 | if (r < 0) | |
2728 | return r; | |
2729 | ||
2730 | r = dns_packet_read_uint16(p, NULL, NULL); | |
2731 | if (r < 0) | |
2732 | return r; | |
2733 | ||
2734 | r = dns_packet_read_uint32(p, &ttl, &ttl_index); | |
2735 | if (r < 0) | |
2736 | return r; | |
2737 | ||
2738 | if (type != DNS_TYPE_OPT) { /* The TTL of the OPT field is not actually a TTL, skip it */ | |
2739 | ttl = LESS_BY(ttl * USEC_PER_SEC, age) / USEC_PER_SEC; | |
2740 | unaligned_write_be32(DNS_PACKET_DATA(p) + ttl_index, ttl); | |
2741 | } | |
2742 | ||
2743 | r = dns_packet_read_uint16(p, &rdlength, NULL); | |
2744 | if (r < 0) | |
2745 | return r; | |
2746 | ||
2747 | r = dns_packet_read(p, rdlength, NULL, NULL); | |
2748 | if (r < 0) | |
2749 | return r; | |
2750 | ||
2751 | CANCEL_REWINDER(rewinder); | |
2752 | return 0; | |
2753 | } | |
2754 | ||
2755 | int dns_packet_patch_ttls(DnsPacket *p, usec_t timestamp) { | |
81b4d94d LP |
2756 | assert(p); |
2757 | assert(timestamp_is_set(timestamp)); | |
2758 | ||
2759 | /* Adjusts all TTLs in the packet by subtracting the time difference between now and the specified timestamp */ | |
2760 | ||
fc44acc0 | 2761 | _unused_ _cleanup_(rewind_dns_packet) DnsPacketRewinder rewinder = REWINDER_INIT(p); |
64ea42e9 | 2762 | unsigned n; |
0c4f37f0 ZJS |
2763 | usec_t k; |
2764 | int r; | |
2765 | ||
ba4e0427 | 2766 | k = now(CLOCK_BOOTTIME); |
81b4d94d LP |
2767 | assert(k >= timestamp); |
2768 | k -= timestamp; | |
2769 | ||
81b4d94d LP |
2770 | dns_packet_rewind(p, DNS_PACKET_HEADER_SIZE); |
2771 | ||
2772 | n = DNS_PACKET_QDCOUNT(p); | |
64ea42e9 | 2773 | for (unsigned i = 0; i < n; i++) { |
81b4d94d LP |
2774 | r = dns_packet_read_key(p, NULL, NULL, NULL); |
2775 | if (r < 0) | |
2776 | return r; | |
2777 | } | |
2778 | ||
2779 | n = DNS_PACKET_RRCOUNT(p); | |
64ea42e9 | 2780 | for (unsigned i = 0; i < n; i++) { |
81b4d94d LP |
2781 | |
2782 | /* DNS servers suck, hence the RR count is in many servers off. If we reached the end | |
2783 | * prematurely, accept that, exit early */ | |
2784 | if (p->rindex == p->size) | |
2785 | break; | |
2786 | ||
2787 | r = patch_rr(p, k); | |
2788 | if (r < 0) | |
2789 | return r; | |
2790 | } | |
2791 | ||
2792 | return 0; | |
2793 | } | |
2794 | ||
7a08d314 | 2795 | static void dns_packet_hash_func(const DnsPacket *s, struct siphash *state) { |
98767d75 IT |
2796 | assert(s); |
2797 | ||
c01a5c05 | 2798 | siphash24_compress_typesafe(s->size, state); |
98767d75 IT |
2799 | siphash24_compress(DNS_PACKET_DATA((DnsPacket*) s), s->size, state); |
2800 | } | |
2801 | ||
7a08d314 | 2802 | static int dns_packet_compare_func(const DnsPacket *x, const DnsPacket *y) { |
a0edd02e | 2803 | int r; |
98767d75 | 2804 | |
a0edd02e FB |
2805 | r = CMP(x->size, y->size); |
2806 | if (r != 0) | |
2807 | return r; | |
98767d75 IT |
2808 | |
2809 | return memcmp(DNS_PACKET_DATA((DnsPacket*) x), DNS_PACKET_DATA((DnsPacket*) y), x->size); | |
2810 | } | |
2811 | ||
7a08d314 | 2812 | DEFINE_HASH_OPS(dns_packet_hash_ops, DnsPacket, dns_packet_hash_func, dns_packet_compare_func); |
98767d75 | 2813 | |
a9fd8837 LP |
2814 | bool dns_packet_equal(const DnsPacket *a, const DnsPacket *b) { |
2815 | return dns_packet_compare_func(a, b) == 0; | |
2816 | } | |
2817 | ||
71682ac6 | 2818 | int dns_packet_ede_rcode(DnsPacket *p, int *ret_ede_rcode, char **ret_ede_msg) { |
ac684446 RP |
2819 | const uint8_t *d; |
2820 | size_t l; | |
71682ac6 YW |
2821 | int r; |
2822 | ||
2823 | assert(p); | |
ac684446 RP |
2824 | |
2825 | if (!p->opt) | |
71682ac6 | 2826 | return -ENOENT; |
ac684446 RP |
2827 | |
2828 | d = p->opt->opt.data; | |
2829 | l = p->opt->opt.data_size; | |
2830 | ||
2831 | while (l > 0) { | |
2832 | uint16_t code, length; | |
2833 | ||
2834 | if (l < 4U) | |
2835 | return log_debug_errno(SYNTHETIC_ERRNO(EBADMSG), | |
2836 | "EDNS0 variable part has invalid size."); | |
2837 | ||
2838 | code = unaligned_read_be16(d); | |
2839 | length = unaligned_read_be16(d + 2); | |
2840 | ||
2841 | if (l < 4U + length) | |
2842 | return log_debug_errno(SYNTHETIC_ERRNO(EBADMSG), | |
2843 | "Truncated option in EDNS0 variable part."); | |
2844 | ||
2845 | if (code == DNS_EDNS_OPT_EXT_ERROR) { | |
71682ac6 YW |
2846 | _cleanup_free_ char *msg = NULL; |
2847 | ||
ac684446 RP |
2848 | if (length < 2U) |
2849 | return log_debug_errno(SYNTHETIC_ERRNO(EBADMSG), | |
71682ac6 YW |
2850 | "EDNS0 truncated EDE info code."); |
2851 | ||
2852 | r = make_cstring((char *) d + 6, length - 2U, MAKE_CSTRING_ALLOW_TRAILING_NUL, &msg); | |
ac684446 | 2853 | if (r < 0) |
71682ac6 YW |
2854 | return log_debug_errno(r, "Invalid EDE text in opt."); |
2855 | ||
2856 | if (ret_ede_msg) { | |
2857 | if (!utf8_is_valid(msg)) { | |
2858 | _cleanup_free_ char *msg_escaped = NULL; | |
2859 | ||
2860 | msg_escaped = cescape(msg); | |
2861 | if (!msg_escaped) | |
2862 | return log_oom_debug(); | |
2863 | ||
2864 | *ret_ede_msg = TAKE_PTR(msg_escaped); | |
2865 | } else | |
2866 | *ret_ede_msg = TAKE_PTR(msg); | |
ac684446 | 2867 | } |
71682ac6 YW |
2868 | |
2869 | if (ret_ede_rcode) | |
2870 | *ret_ede_rcode = unaligned_read_be16(d + 4); | |
2871 | ||
2872 | return 0; | |
ac684446 RP |
2873 | } |
2874 | ||
2875 | d += 4U + length; | |
2876 | l -= 4U + length; | |
2877 | } | |
2878 | ||
71682ac6 | 2879 | return -ENOENT; |
ac684446 RP |
2880 | } |
2881 | ||
2882 | bool dns_ede_rcode_is_dnssec(int ede_rcode) { | |
2883 | return IN_SET(ede_rcode, | |
2884 | DNS_EDE_RCODE_UNSUPPORTED_DNSKEY_ALG, | |
2885 | DNS_EDE_RCODE_UNSUPPORTED_DS_DIGEST, | |
2886 | DNS_EDE_RCODE_DNSSEC_INDETERMINATE, | |
2887 | DNS_EDE_RCODE_DNSSEC_BOGUS, | |
2888 | DNS_EDE_RCODE_SIG_EXPIRED, | |
2889 | DNS_EDE_RCODE_SIG_NOT_YET_VALID, | |
2890 | DNS_EDE_RCODE_DNSKEY_MISSING, | |
2891 | DNS_EDE_RCODE_RRSIG_MISSING, | |
2892 | DNS_EDE_RCODE_NO_ZONE_KEY_BIT, | |
2893 | DNS_EDE_RCODE_NSEC_MISSING | |
2894 | ); | |
2895 | } | |
2896 | ||
4a6eb824 LP |
2897 | int dns_packet_has_nsid_request(DnsPacket *p) { |
2898 | bool has_nsid = false; | |
2899 | const uint8_t *d; | |
2900 | size_t l; | |
2901 | ||
2902 | assert(p); | |
2903 | ||
2904 | if (!p->opt) | |
2905 | return false; | |
2906 | ||
2907 | d = p->opt->opt.data; | |
2908 | l = p->opt->opt.data_size; | |
2909 | ||
2910 | while (l > 0) { | |
2911 | uint16_t code, length; | |
2912 | ||
2913 | if (l < 4U) | |
2914 | return log_debug_errno(SYNTHETIC_ERRNO(EBADMSG), | |
2915 | "EDNS0 variable part has invalid size."); | |
2916 | ||
2917 | code = unaligned_read_be16(d); | |
2918 | length = unaligned_read_be16(d + 2); | |
2919 | ||
2920 | if (l < 4U + length) | |
2921 | return log_debug_errno(SYNTHETIC_ERRNO(EBADMSG), | |
2922 | "Truncated option in EDNS0 variable part."); | |
2923 | ||
980cb160 | 2924 | if (code == DNS_EDNS_OPT_NSID) { |
4a6eb824 LP |
2925 | if (has_nsid) |
2926 | return log_debug_errno(SYNTHETIC_ERRNO(EBADMSG), | |
2927 | "Duplicate NSID option in EDNS0 variable part."); | |
2928 | ||
2929 | if (length != 0) | |
2930 | return log_debug_errno(SYNTHETIC_ERRNO(EBADMSG), | |
2931 | "Non-empty NSID option in DNS request."); | |
2932 | ||
2933 | has_nsid = true; | |
2934 | } | |
2935 | ||
2936 | d += 4U + length; | |
2937 | l -= 4U + length; | |
2938 | } | |
2939 | ||
2940 | return has_nsid; | |
2941 | } | |
2942 | ||
acbf761b LP |
2943 | size_t dns_packet_size_unfragmented(DnsPacket *p) { |
2944 | assert(p); | |
2945 | ||
2946 | if (p->fragsize == 0) /* Wasn't fragmented */ | |
2947 | return p->size; | |
2948 | ||
2949 | /* The fragment size (p->fragsize) covers the whole (fragmented) IP packet, while the regular packet | |
2950 | * size (p->size) only covers the DNS part. Thus, subtract the UDP header from the largest fragment | |
2951 | * size, in order to determine which size of DNS packet would have gone through without | |
2952 | * fragmenting. */ | |
2953 | ||
2954 | return LESS_BY(p->fragsize, udp_header_size(p->family)); | |
2955 | } | |
2956 | ||
ee2108dc RP |
2957 | static const char* const dns_svc_param_key_table[_DNS_SVC_PARAM_KEY_MAX_DEFINED] = { |
2958 | [DNS_SVC_PARAM_KEY_MANDATORY] = "mandatory", | |
2959 | [DNS_SVC_PARAM_KEY_ALPN] = "alpn", | |
2960 | [DNS_SVC_PARAM_KEY_NO_DEFAULT_ALPN] = "no-default-alpn", | |
2961 | [DNS_SVC_PARAM_KEY_PORT] = "port", | |
2962 | [DNS_SVC_PARAM_KEY_IPV4HINT] = "ipv4hint", | |
2963 | [DNS_SVC_PARAM_KEY_ECH] = "ech", | |
2964 | [DNS_SVC_PARAM_KEY_IPV6HINT] = "ipv6hint", | |
2965 | [DNS_SVC_PARAM_KEY_DOHPATH] = "dohpath", | |
2966 | [DNS_SVC_PARAM_KEY_OHTTP] = "ohttp", | |
2967 | }; | |
2968 | DEFINE_STRING_TABLE_LOOKUP_TO_STRING(dns_svc_param_key, int); | |
2969 | ||
2970 | const char* format_dns_svc_param_key(uint16_t i, char buf[static DECIMAL_STR_MAX(uint16_t)+3]) { | |
2971 | const char *p = dns_svc_param_key_to_string(i); | |
2972 | if (p) | |
2973 | return p; | |
2974 | ||
2975 | return snprintf_ok(buf, DECIMAL_STR_MAX(uint16_t)+3, "key%i", i); | |
2976 | } | |
2977 | ||
74b2466e | 2978 | static const char* const dns_rcode_table[_DNS_RCODE_MAX_DEFINED] = { |
e3e64a1a ZJS |
2979 | [DNS_RCODE_SUCCESS] = "SUCCESS", |
2980 | [DNS_RCODE_FORMERR] = "FORMERR", | |
2981 | [DNS_RCODE_SERVFAIL] = "SERVFAIL", | |
2982 | [DNS_RCODE_NXDOMAIN] = "NXDOMAIN", | |
2983 | [DNS_RCODE_NOTIMP] = "NOTIMP", | |
2984 | [DNS_RCODE_REFUSED] = "REFUSED", | |
2985 | [DNS_RCODE_YXDOMAIN] = "YXDOMAIN", | |
2986 | [DNS_RCODE_YXRRSET] = "YRRSET", | |
2987 | [DNS_RCODE_NXRRSET] = "NXRRSET", | |
2988 | [DNS_RCODE_NOTAUTH] = "NOTAUTH", | |
2989 | [DNS_RCODE_NOTZONE] = "NOTZONE", | |
a92ea352 | 2990 | [DNS_RCODE_DSOTYPENI] = "DSOTYPENI", |
e3e64a1a ZJS |
2991 | [DNS_RCODE_BADVERS] = "BADVERS", |
2992 | [DNS_RCODE_BADKEY] = "BADKEY", | |
2993 | [DNS_RCODE_BADTIME] = "BADTIME", | |
2994 | [DNS_RCODE_BADMODE] = "BADMODE", | |
2995 | [DNS_RCODE_BADNAME] = "BADNAME", | |
2996 | [DNS_RCODE_BADALG] = "BADALG", | |
2997 | [DNS_RCODE_BADTRUNC] = "BADTRUNC", | |
6f21e066 | 2998 | [DNS_RCODE_BADCOOKIE] = "BADCOOKIE", |
74b2466e LP |
2999 | }; |
3000 | DEFINE_STRING_TABLE_LOOKUP(dns_rcode, int); | |
1716f6dc | 3001 | |
bfd5a068 | 3002 | const char* format_dns_rcode(int i, char buf[static DECIMAL_STR_MAX(int)]) { |
0d609349 YW |
3003 | const char *p = dns_rcode_to_string(i); |
3004 | if (p) | |
3005 | return p; | |
3006 | ||
3007 | return snprintf_ok(buf, DECIMAL_STR_MAX(int), "%i", i); | |
3008 | } | |
3009 | ||
056db786 RP |
3010 | static const char* const dns_ede_rcode_table[_DNS_EDE_RCODE_MAX_DEFINED] = { |
3011 | [DNS_EDE_RCODE_OTHER] = "Other", | |
3012 | [DNS_EDE_RCODE_UNSUPPORTED_DNSKEY_ALG] = "Unsupported DNSKEY Algorithm", | |
3013 | [DNS_EDE_RCODE_UNSUPPORTED_DS_DIGEST] = "Unsupported DS Digest Type", | |
3014 | [DNS_EDE_RCODE_STALE_ANSWER] = "Stale Answer", | |
3015 | [DNS_EDE_RCODE_FORGED_ANSWER] = "Forged Answer", | |
3016 | [DNS_EDE_RCODE_DNSSEC_INDETERMINATE] = "DNSSEC Indeterminate", | |
3017 | [DNS_EDE_RCODE_DNSSEC_BOGUS] = "DNSSEC Bogus", | |
3018 | [DNS_EDE_RCODE_SIG_EXPIRED] = "Signature Expired", | |
3019 | [DNS_EDE_RCODE_SIG_NOT_YET_VALID] = "Signature Not Yet Valid", | |
3020 | [DNS_EDE_RCODE_DNSKEY_MISSING] = "DNSKEY Missing", | |
3021 | [DNS_EDE_RCODE_RRSIG_MISSING] = "RRSIG Missing", | |
3022 | [DNS_EDE_RCODE_NO_ZONE_KEY_BIT] = "No Zone Key Bit Set", | |
3023 | [DNS_EDE_RCODE_NSEC_MISSING] = "NSEC Missing", | |
3024 | [DNS_EDE_RCODE_CACHED_ERROR] = "Cached Error", | |
3025 | [DNS_EDE_RCODE_NOT_READY] = "Not Ready", | |
3026 | [DNS_EDE_RCODE_BLOCKED] = "Blocked", | |
3027 | [DNS_EDE_RCODE_CENSORED] = "Censored", | |
3028 | [DNS_EDE_RCODE_FILTERED] = "Filtered", | |
9379b23b | 3029 | [DNS_EDE_RCODE_PROHIBITED] = "Prohibited", |
056db786 RP |
3030 | [DNS_EDE_RCODE_STALE_NXDOMAIN_ANSWER] = "Stale NXDOMAIN Answer", |
3031 | [DNS_EDE_RCODE_NOT_AUTHORITATIVE] = "Not Authoritative", | |
3032 | [DNS_EDE_RCODE_NOT_SUPPORTED] = "Not Supported", | |
3033 | [DNS_EDE_RCODE_UNREACH_AUTHORITY] = "No Reachable Authority", | |
3034 | [DNS_EDE_RCODE_NET_ERROR] = "Network Error", | |
3035 | [DNS_EDE_RCODE_INVALID_DATA] = "Invalid Data", | |
3036 | [DNS_EDE_RCODE_SIG_NEVER] = "Signature Never Valid", | |
3037 | [DNS_EDE_RCODE_TOO_EARLY] = "Too Early", | |
3038 | [DNS_EDE_RCODE_UNSUPPORTED_NSEC3_ITER] = "Unsupported NSEC3 Iterations", | |
3039 | [DNS_EDE_RCODE_TRANSPORT_POLICY] = "Impossible Transport Policy", | |
3040 | [DNS_EDE_RCODE_SYNTHESIZED] = "Synthesized", | |
3041 | }; | |
ac684446 | 3042 | DEFINE_STRING_TABLE_LOOKUP_TO_STRING(dns_ede_rcode, int); |
056db786 | 3043 | |
bfd5a068 | 3044 | const char* format_dns_ede_rcode(int i, char buf[static DECIMAL_STR_MAX(int)]) { |
056db786 RP |
3045 | const char *p = dns_ede_rcode_to_string(i); |
3046 | if (p) | |
3047 | return p; | |
3048 | ||
3049 | return snprintf_ok(buf, DECIMAL_STR_MAX(int), "%i", i); | |
3050 | } | |
3051 | ||
1716f6dc | 3052 | static const char* const dns_protocol_table[_DNS_PROTOCOL_MAX] = { |
e3e64a1a ZJS |
3053 | [DNS_PROTOCOL_DNS] = "dns", |
3054 | [DNS_PROTOCOL_MDNS] = "mdns", | |
1716f6dc LP |
3055 | [DNS_PROTOCOL_LLMNR] = "llmnr", |
3056 | }; | |
3057 | DEFINE_STRING_TABLE_LOOKUP(dns_protocol, DnsProtocol); |