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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
74b2466e | 2 | |
b5efdb8a | 3 | #include "alloc-util.h" |
2a1037af | 4 | #include "dns-domain.h" |
011696f7 | 5 | #include "dns-type.h" |
b5efdb8a | 6 | #include "hostname-util.h" |
78c6a153 | 7 | #include "local-addresses.h" |
74b2466e | 8 | #include "resolved-dns-query.h" |
839a4a20 | 9 | #include "resolved-dns-synthesize.h" |
dd0bc0f1 | 10 | #include "resolved-etc-hosts.h" |
23b298bc | 11 | #include "string-util.h" |
74b2466e | 12 | |
8ba9fd9c | 13 | #define CNAME_MAX 8 |
39762fdf | 14 | #define QUERIES_MAX 2048 |
45ec7efb | 15 | #define AUXILIARY_QUERIES_MAX 64 |
8ba9fd9c | 16 | |
801ad6a6 LP |
17 | static int dns_query_candidate_new(DnsQueryCandidate **ret, DnsQuery *q, DnsScope *s) { |
18 | DnsQueryCandidate *c; | |
74b2466e | 19 | |
801ad6a6 | 20 | assert(ret); |
faa133f3 | 21 | assert(q); |
801ad6a6 | 22 | assert(s); |
74b2466e | 23 | |
801ad6a6 LP |
24 | c = new0(DnsQueryCandidate, 1); |
25 | if (!c) | |
26 | return -ENOMEM; | |
27 | ||
28 | c->query = q; | |
29 | c->scope = s; | |
30 | ||
31 | LIST_PREPEND(candidates_by_query, q->candidates, c); | |
32 | LIST_PREPEND(candidates_by_scope, s->query_candidates, c); | |
33 | ||
34 | *ret = c; | |
35 | return 0; | |
36 | } | |
37 | ||
38 | static void dns_query_candidate_stop(DnsQueryCandidate *c) { | |
39 | DnsTransaction *t; | |
74b2466e | 40 | |
801ad6a6 LP |
41 | assert(c); |
42 | ||
43 | while ((t = set_steal_first(c->transactions))) { | |
547973de | 44 | set_remove(t->notify_query_candidates, c); |
35aa04e9 | 45 | set_remove(t->notify_query_candidates_done, c); |
ec2c5e43 | 46 | dns_transaction_gc(t); |
74b2466e | 47 | } |
74b2466e LP |
48 | } |
49 | ||
801ad6a6 LP |
50 | DnsQueryCandidate* dns_query_candidate_free(DnsQueryCandidate *c) { |
51 | ||
52 | if (!c) | |
53 | return NULL; | |
54 | ||
55 | dns_query_candidate_stop(c); | |
56 | ||
57 | set_free(c->transactions); | |
58 | dns_search_domain_unref(c->search_domain); | |
59 | ||
60 | if (c->query) | |
61 | LIST_REMOVE(candidates_by_query, c->query->candidates, c); | |
62 | ||
63 | if (c->scope) | |
64 | LIST_REMOVE(candidates_by_scope, c->scope->query_candidates, c); | |
65 | ||
6b430fdb | 66 | return mfree(c); |
801ad6a6 LP |
67 | } |
68 | ||
69 | static int dns_query_candidate_next_search_domain(DnsQueryCandidate *c) { | |
801ad6a6 LP |
70 | DnsSearchDomain *next = NULL; |
71 | ||
72 | assert(c); | |
73 | ||
ad44b56b | 74 | if (c->search_domain && c->search_domain->linked) |
801ad6a6 | 75 | next = c->search_domain->domains_next; |
ad44b56b LP |
76 | else |
77 | next = dns_scope_get_search_domains(c->scope); | |
801ad6a6 | 78 | |
ad44b56b | 79 | for (;;) { |
6627b7e2 LP |
80 | if (!next) /* We hit the end of the list */ |
81 | return 0; | |
801ad6a6 | 82 | |
ad44b56b LP |
83 | if (!next->route_only) |
84 | break; | |
801ad6a6 | 85 | |
ad44b56b LP |
86 | /* Skip over route-only domains */ |
87 | next = next->domains_next; | |
801ad6a6 LP |
88 | } |
89 | ||
90 | dns_search_domain_unref(c->search_domain); | |
91 | c->search_domain = dns_search_domain_ref(next); | |
6627b7e2 | 92 | |
801ad6a6 LP |
93 | return 1; |
94 | } | |
95 | ||
96 | static int dns_query_candidate_add_transaction(DnsQueryCandidate *c, DnsResourceKey *key) { | |
97 | DnsTransaction *t; | |
98 | int r; | |
99 | ||
100 | assert(c); | |
101 | assert(key); | |
102 | ||
801ad6a6 LP |
103 | t = dns_scope_find_transaction(c->scope, key, true); |
104 | if (!t) { | |
105 | r = dns_transaction_new(&t, c->scope, key); | |
106 | if (r < 0) | |
107 | return r; | |
547973de LP |
108 | } else { |
109 | if (set_contains(c->transactions, t)) | |
110 | return 0; | |
801ad6a6 LP |
111 | } |
112 | ||
547973de LP |
113 | r = set_ensure_allocated(&c->transactions, NULL); |
114 | if (r < 0) | |
115 | goto gc; | |
116 | ||
117 | r = set_ensure_allocated(&t->notify_query_candidates, NULL); | |
801ad6a6 LP |
118 | if (r < 0) |
119 | goto gc; | |
120 | ||
35aa04e9 LP |
121 | r = set_ensure_allocated(&t->notify_query_candidates_done, NULL); |
122 | if (r < 0) | |
123 | goto gc; | |
124 | ||
547973de | 125 | r = set_put(t->notify_query_candidates, c); |
801ad6a6 LP |
126 | if (r < 0) |
127 | goto gc; | |
128 | ||
129 | r = set_put(c->transactions, t); | |
130 | if (r < 0) { | |
547973de | 131 | (void) set_remove(t->notify_query_candidates, c); |
801ad6a6 LP |
132 | goto gc; |
133 | } | |
134 | ||
17c8de63 | 135 | t->clamp_ttl = c->query->clamp_ttl; |
547973de | 136 | return 1; |
801ad6a6 LP |
137 | |
138 | gc: | |
139 | dns_transaction_gc(t); | |
140 | return r; | |
141 | } | |
142 | ||
143 | static int dns_query_candidate_go(DnsQueryCandidate *c) { | |
144 | DnsTransaction *t; | |
145 | Iterator i; | |
146 | int r; | |
011696f7 | 147 | unsigned n = 0; |
801ad6a6 LP |
148 | |
149 | assert(c); | |
150 | ||
151 | /* Start the transactions that are not started yet */ | |
152 | SET_FOREACH(t, c->transactions, i) { | |
153 | if (t->state != DNS_TRANSACTION_NULL) | |
154 | continue; | |
155 | ||
156 | r = dns_transaction_go(t); | |
157 | if (r < 0) | |
158 | return r; | |
011696f7 LP |
159 | |
160 | n++; | |
801ad6a6 LP |
161 | } |
162 | ||
011696f7 LP |
163 | /* If there was nothing to start, then let's proceed immediately */ |
164 | if (n == 0) | |
165 | dns_query_candidate_notify(c); | |
166 | ||
801ad6a6 LP |
167 | return 0; |
168 | } | |
169 | ||
170 | static DnsTransactionState dns_query_candidate_state(DnsQueryCandidate *c) { | |
171 | DnsTransactionState state = DNS_TRANSACTION_NO_SERVERS; | |
172 | DnsTransaction *t; | |
173 | Iterator i; | |
174 | ||
175 | assert(c); | |
176 | ||
177 | if (c->error_code != 0) | |
7cc6ed7b | 178 | return DNS_TRANSACTION_ERRNO; |
801ad6a6 LP |
179 | |
180 | SET_FOREACH(t, c->transactions, i) { | |
181 | ||
182 | switch (t->state) { | |
183 | ||
5264131a LP |
184 | case DNS_TRANSACTION_NULL: |
185 | /* If there's a NULL transaction pending, then | |
186 | * this means not all transactions where | |
187 | * started yet, and we were called from within | |
188 | * the stackframe that is supposed to start | |
189 | * remaining transactions. In this case, | |
190 | * simply claim the candidate is pending. */ | |
191 | ||
801ad6a6 | 192 | case DNS_TRANSACTION_PENDING: |
547973de LP |
193 | case DNS_TRANSACTION_VALIDATING: |
194 | /* If there's one transaction currently in | |
195 | * VALIDATING state, then this means there's | |
196 | * also one in PENDING state, hence we can | |
197 | * return PENDING immediately. */ | |
198 | return DNS_TRANSACTION_PENDING; | |
801ad6a6 LP |
199 | |
200 | case DNS_TRANSACTION_SUCCESS: | |
201 | state = t->state; | |
202 | break; | |
203 | ||
204 | default: | |
205 | if (state != DNS_TRANSACTION_SUCCESS) | |
206 | state = t->state; | |
207 | ||
208 | break; | |
209 | } | |
210 | } | |
211 | ||
212 | return state; | |
213 | } | |
214 | ||
011696f7 LP |
215 | static bool dns_query_candidate_is_routable(DnsQueryCandidate *c, uint16_t type) { |
216 | int family; | |
217 | ||
218 | assert(c); | |
219 | ||
220 | /* Checks whether the specified RR type matches an address family that is routable on the link(s) the scope of | |
221 | * this candidate belongs to. Specifically, whether there's a routable IPv4 address on it if we query an A RR, | |
222 | * or a routable IPv6 address if we query an AAAA RR. */ | |
223 | ||
224 | if (!c->query->suppress_unroutable_family) | |
225 | return true; | |
226 | ||
227 | if (c->scope->protocol != DNS_PROTOCOL_DNS) | |
228 | return true; | |
229 | ||
230 | family = dns_type_to_af(type); | |
231 | if (family < 0) | |
232 | return true; | |
233 | ||
234 | if (c->scope->link) | |
235 | return link_relevant(c->scope->link, family, false); | |
236 | else | |
237 | return manager_routable(c->scope->manager, family); | |
238 | } | |
239 | ||
801ad6a6 | 240 | static int dns_query_candidate_setup_transactions(DnsQueryCandidate *c) { |
23b298bc | 241 | DnsQuestion *question; |
801ad6a6 LP |
242 | DnsResourceKey *key; |
243 | int n = 0, r; | |
244 | ||
245 | assert(c); | |
246 | ||
247 | dns_query_candidate_stop(c); | |
248 | ||
23b298bc LP |
249 | question = dns_query_question_for_protocol(c->query, c->scope->protocol); |
250 | ||
801ad6a6 | 251 | /* Create one transaction per question key */ |
23b298bc | 252 | DNS_QUESTION_FOREACH(key, question) { |
801ad6a6 | 253 | _cleanup_(dns_resource_key_unrefp) DnsResourceKey *new_key = NULL; |
011696f7 LP |
254 | DnsResourceKey *qkey; |
255 | ||
256 | if (!dns_query_candidate_is_routable(c, key->type)) | |
257 | continue; | |
801ad6a6 LP |
258 | |
259 | if (c->search_domain) { | |
260 | r = dns_resource_key_new_append_suffix(&new_key, key, c->search_domain->name); | |
261 | if (r < 0) | |
262 | goto fail; | |
801ad6a6 | 263 | |
011696f7 LP |
264 | qkey = new_key; |
265 | } else | |
266 | qkey = key; | |
267 | ||
268 | if (!dns_scope_good_key(c->scope, qkey)) | |
269 | continue; | |
270 | ||
271 | r = dns_query_candidate_add_transaction(c, qkey); | |
801ad6a6 LP |
272 | if (r < 0) |
273 | goto fail; | |
274 | ||
275 | n++; | |
276 | } | |
277 | ||
278 | return n; | |
279 | ||
280 | fail: | |
281 | dns_query_candidate_stop(c); | |
282 | return r; | |
283 | } | |
284 | ||
547973de | 285 | void dns_query_candidate_notify(DnsQueryCandidate *c) { |
801ad6a6 LP |
286 | DnsTransactionState state; |
287 | int r; | |
288 | ||
289 | assert(c); | |
290 | ||
291 | state = dns_query_candidate_state(c); | |
292 | ||
547973de | 293 | if (DNS_TRANSACTION_IS_LIVE(state)) |
801ad6a6 LP |
294 | return; |
295 | ||
296 | if (state != DNS_TRANSACTION_SUCCESS && c->search_domain) { | |
297 | ||
298 | r = dns_query_candidate_next_search_domain(c); | |
299 | if (r < 0) | |
300 | goto fail; | |
301 | ||
302 | if (r > 0) { | |
303 | /* OK, there's another search domain to try, let's do so. */ | |
304 | ||
305 | r = dns_query_candidate_setup_transactions(c); | |
306 | if (r < 0) | |
307 | goto fail; | |
308 | ||
309 | if (r > 0) { | |
310 | /* New transactions where queued. Start them and wait */ | |
311 | ||
312 | r = dns_query_candidate_go(c); | |
313 | if (r < 0) | |
314 | goto fail; | |
315 | ||
316 | return; | |
317 | } | |
318 | } | |
319 | ||
320 | } | |
321 | ||
322 | dns_query_ready(c->query); | |
323 | return; | |
324 | ||
325 | fail: | |
326 | log_warning_errno(r, "Failed to follow search domains: %m"); | |
327 | c->error_code = r; | |
328 | dns_query_ready(c->query); | |
329 | } | |
330 | ||
331 | static void dns_query_stop(DnsQuery *q) { | |
332 | DnsQueryCandidate *c; | |
333 | ||
334 | assert(q); | |
335 | ||
336 | q->timeout_event_source = sd_event_source_unref(q->timeout_event_source); | |
337 | ||
338 | LIST_FOREACH(candidates_by_query, c, q->candidates) | |
339 | dns_query_candidate_stop(c); | |
340 | } | |
341 | ||
7820b320 LP |
342 | static void dns_query_free_candidates(DnsQuery *q) { |
343 | assert(q); | |
344 | ||
345 | while (q->candidates) | |
346 | dns_query_candidate_free(q->candidates); | |
347 | } | |
348 | ||
349 | static void dns_query_reset_answer(DnsQuery *q) { | |
350 | assert(q); | |
351 | ||
352 | q->answer = dns_answer_unref(q->answer); | |
353 | q->answer_rcode = 0; | |
354 | q->answer_dnssec_result = _DNSSEC_RESULT_INVALID; | |
7cc6ed7b | 355 | q->answer_errno = 0; |
7820b320 LP |
356 | q->answer_authenticated = false; |
357 | q->answer_protocol = _DNS_PROTOCOL_INVALID; | |
358 | q->answer_family = AF_UNSPEC; | |
359 | q->answer_search_domain = dns_search_domain_unref(q->answer_search_domain); | |
360 | } | |
361 | ||
74b2466e | 362 | DnsQuery *dns_query_free(DnsQuery *q) { |
74b2466e LP |
363 | if (!q) |
364 | return NULL; | |
365 | ||
45ec7efb LP |
366 | while (q->auxiliary_queries) |
367 | dns_query_free(q->auxiliary_queries); | |
368 | ||
369 | if (q->auxiliary_for) { | |
370 | assert(q->auxiliary_for->n_auxiliary_queries > 0); | |
371 | q->auxiliary_for->n_auxiliary_queries--; | |
372 | LIST_REMOVE(auxiliary_queries, q->auxiliary_for->auxiliary_queries, q); | |
373 | } | |
374 | ||
7820b320 | 375 | dns_query_free_candidates(q); |
322345fd | 376 | |
23b298bc LP |
377 | dns_question_unref(q->question_idna); |
378 | dns_question_unref(q->question_utf8); | |
7820b320 LP |
379 | |
380 | dns_query_reset_answer(q); | |
322345fd | 381 | |
ec2c5e43 | 382 | sd_bus_message_unref(q->request); |
82bd6ddd | 383 | sd_bus_track_unref(q->bus_track); |
74b2466e | 384 | |
b30bf55d | 385 | dns_packet_unref(q->request_dns_packet); |
e8d23f92 | 386 | dns_packet_unref(q->reply_dns_packet); |
b30bf55d LP |
387 | |
388 | if (q->request_dns_stream) { | |
389 | /* Detach the stream from our query, in case something else keeps a reference to it. */ | |
390 | q->request_dns_stream->complete = NULL; | |
391 | q->request_dns_stream->on_packet = NULL; | |
392 | q->request_dns_stream->query = NULL; | |
393 | dns_stream_unref(q->request_dns_stream); | |
394 | } | |
395 | ||
23b298bc LP |
396 | free(q->request_address_string); |
397 | ||
39762fdf | 398 | if (q->manager) { |
74b2466e | 399 | LIST_REMOVE(queries, q->manager->dns_queries, q); |
39762fdf LP |
400 | q->manager->n_dns_queries--; |
401 | } | |
74b2466e | 402 | |
6b430fdb | 403 | return mfree(q); |
74b2466e LP |
404 | } |
405 | ||
23b298bc LP |
406 | int dns_query_new( |
407 | Manager *m, | |
408 | DnsQuery **ret, | |
409 | DnsQuestion *question_utf8, | |
410 | DnsQuestion *question_idna, | |
17c8de63 LP |
411 | int ifindex, |
412 | uint64_t flags) { | |
23b298bc | 413 | |
74b2466e | 414 | _cleanup_(dns_query_freep) DnsQuery *q = NULL; |
23b298bc LP |
415 | DnsResourceKey *key; |
416 | bool good = false; | |
faa133f3 | 417 | int r; |
202b76ae | 418 | char key_str[DNS_RESOURCE_KEY_STRING_MAX]; |
74b2466e LP |
419 | |
420 | assert(m); | |
421 | ||
23b298bc LP |
422 | if (dns_question_size(question_utf8) > 0) { |
423 | r = dns_question_is_valid_for_query(question_utf8); | |
424 | if (r < 0) | |
425 | return r; | |
426 | if (r == 0) | |
427 | return -EINVAL; | |
428 | ||
429 | good = true; | |
430 | } | |
431 | ||
432 | /* If the IDNA and UTF8 questions are the same, merge their references */ | |
433 | r = dns_question_is_equal(question_idna, question_utf8); | |
faa133f3 LP |
434 | if (r < 0) |
435 | return r; | |
23b298bc LP |
436 | if (r > 0) |
437 | question_idna = question_utf8; | |
438 | else { | |
439 | if (dns_question_size(question_idna) > 0) { | |
440 | r = dns_question_is_valid_for_query(question_idna); | |
441 | if (r < 0) | |
442 | return r; | |
443 | if (r == 0) | |
444 | return -EINVAL; | |
445 | ||
446 | good = true; | |
447 | } | |
448 | } | |
449 | ||
450 | if (!good) /* don't allow empty queries */ | |
451 | return -EINVAL; | |
74b2466e | 452 | |
39762fdf LP |
453 | if (m->n_dns_queries >= QUERIES_MAX) |
454 | return -EBUSY; | |
455 | ||
74b2466e LP |
456 | q = new0(DnsQuery, 1); |
457 | if (!q) | |
458 | return -ENOMEM; | |
459 | ||
23b298bc LP |
460 | q->question_utf8 = dns_question_ref(question_utf8); |
461 | q->question_idna = dns_question_ref(question_idna); | |
51323288 LP |
462 | q->ifindex = ifindex; |
463 | q->flags = flags; | |
7820b320 | 464 | q->answer_dnssec_result = _DNSSEC_RESULT_INVALID; |
801ad6a6 | 465 | q->answer_protocol = _DNS_PROTOCOL_INVALID; |
7820b320 | 466 | q->answer_family = AF_UNSPEC; |
322345fd | 467 | |
23b298bc | 468 | /* First dump UTF8 question */ |
202b76ae ZJS |
469 | DNS_QUESTION_FOREACH(key, question_utf8) |
470 | log_debug("Looking up RR for %s.", | |
471 | dns_resource_key_to_string(key, key_str, sizeof key_str)); | |
23b298bc LP |
472 | |
473 | /* And then dump the IDNA question, but only what hasn't been dumped already through the UTF8 question. */ | |
474 | DNS_QUESTION_FOREACH(key, question_idna) { | |
23b298bc LP |
475 | r = dns_question_contains(question_utf8, key); |
476 | if (r < 0) | |
477 | return r; | |
478 | if (r > 0) | |
479 | continue; | |
480 | ||
202b76ae ZJS |
481 | log_debug("Looking up IDNA RR for %s.", |
482 | dns_resource_key_to_string(key, key_str, sizeof key_str)); | |
74b2466e LP |
483 | } |
484 | ||
485 | LIST_PREPEND(queries, m->dns_queries, q); | |
39762fdf | 486 | m->n_dns_queries++; |
74b2466e LP |
487 | q->manager = m; |
488 | ||
8ba9fd9c LP |
489 | if (ret) |
490 | *ret = q; | |
491 | q = NULL; | |
492 | ||
493 | return 0; | |
494 | } | |
495 | ||
45ec7efb LP |
496 | int dns_query_make_auxiliary(DnsQuery *q, DnsQuery *auxiliary_for) { |
497 | assert(q); | |
498 | assert(auxiliary_for); | |
499 | ||
61233823 | 500 | /* Ensure that the query is not auxiliary yet, and |
45ec7efb LP |
501 | * nothing else is auxiliary to it either */ |
502 | assert(!q->auxiliary_for); | |
503 | assert(!q->auxiliary_queries); | |
504 | ||
505 | /* Ensure that the unit we shall be made auxiliary for isn't | |
506 | * auxiliary itself */ | |
507 | assert(!auxiliary_for->auxiliary_for); | |
508 | ||
509 | if (auxiliary_for->n_auxiliary_queries >= AUXILIARY_QUERIES_MAX) | |
510 | return -EAGAIN; | |
511 | ||
512 | LIST_PREPEND(auxiliary_queries, auxiliary_for->auxiliary_queries, q); | |
513 | q->auxiliary_for = auxiliary_for; | |
514 | ||
515 | auxiliary_for->n_auxiliary_queries++; | |
516 | return 0; | |
517 | } | |
518 | ||
ec2c5e43 | 519 | static void dns_query_complete(DnsQuery *q, DnsTransactionState state) { |
8ba9fd9c | 520 | assert(q); |
547973de LP |
521 | assert(!DNS_TRANSACTION_IS_LIVE(state)); |
522 | assert(DNS_TRANSACTION_IS_LIVE(q->state)); | |
8ba9fd9c | 523 | |
322345fd LP |
524 | /* Note that this call might invalidate the query. Callers |
525 | * should hence not attempt to access the query or transaction | |
526 | * after calling this function. */ | |
8ba9fd9c | 527 | |
8ba9fd9c LP |
528 | q->state = state; |
529 | ||
322345fd LP |
530 | dns_query_stop(q); |
531 | if (q->complete) | |
532 | q->complete(q); | |
8ba9fd9c LP |
533 | } |
534 | ||
535 | static int on_query_timeout(sd_event_source *s, usec_t usec, void *userdata) { | |
536 | DnsQuery *q = userdata; | |
537 | ||
538 | assert(s); | |
539 | assert(q); | |
540 | ||
ec2c5e43 | 541 | dns_query_complete(q, DNS_TRANSACTION_TIMEOUT); |
8ba9fd9c LP |
542 | return 0; |
543 | } | |
544 | ||
801ad6a6 LP |
545 | static int dns_query_add_candidate(DnsQuery *q, DnsScope *s) { |
546 | DnsQueryCandidate *c; | |
faa133f3 LP |
547 | int r; |
548 | ||
549 | assert(q); | |
ec2c5e43 | 550 | assert(s); |
faa133f3 | 551 | |
801ad6a6 | 552 | r = dns_query_candidate_new(&c, q, s); |
faa133f3 LP |
553 | if (r < 0) |
554 | return r; | |
555 | ||
801ad6a6 | 556 | /* If this a single-label domain on DNS, we might append a suitable search domain first. */ |
6da95857 YW |
557 | if ((q->flags & SD_RESOLVED_NO_SEARCH) == 0 && |
558 | dns_scope_name_needs_search_domain(s, dns_question_first_name(q->question_idna))) { | |
559 | /* OK, we need a search domain now. Let's find one for this scope */ | |
22f711bb | 560 | |
6da95857 YW |
561 | r = dns_query_candidate_next_search_domain(c); |
562 | if (r <= 0) /* if there's no search domain, then we won't add any transaction. */ | |
563 | goto fail; | |
faa133f3 LP |
564 | } |
565 | ||
801ad6a6 LP |
566 | r = dns_query_candidate_setup_transactions(c); |
567 | if (r < 0) | |
568 | goto fail; | |
569 | ||
faa133f3 LP |
570 | return 0; |
571 | ||
801ad6a6 LP |
572 | fail: |
573 | dns_query_candidate_free(c); | |
faa133f3 LP |
574 | return r; |
575 | } | |
576 | ||
78c6a153 | 577 | static int dns_query_synthesize_reply(DnsQuery *q, DnsTransactionState *state) { |
2a1037af | 578 | _cleanup_(dns_answer_unrefp) DnsAnswer *answer = NULL; |
dd0bc0f1 | 579 | int r; |
2a1037af LP |
580 | |
581 | assert(q); | |
582 | assert(state); | |
583 | ||
dd0bc0f1 LP |
584 | /* Tries to synthesize localhost RR replies (and others) where appropriate. Note that this is done *after* the |
585 | * the normal lookup finished. The data from the network hence takes precedence over the data we | |
586 | * synthesize. (But note that many scopes refuse to resolve certain domain names) */ | |
2a1037af LP |
587 | |
588 | if (!IN_SET(*state, | |
3bbdc31d | 589 | DNS_TRANSACTION_RCODE_FAILURE, |
2a1037af LP |
590 | DNS_TRANSACTION_NO_SERVERS, |
591 | DNS_TRANSACTION_TIMEOUT, | |
edbcc1fd | 592 | DNS_TRANSACTION_ATTEMPTS_MAX_REACHED, |
0791110f LP |
593 | DNS_TRANSACTION_NETWORK_DOWN, |
594 | DNS_TRANSACTION_NOT_FOUND)) | |
78c6a153 | 595 | return 0; |
2a1037af | 596 | |
839a4a20 LP |
597 | r = dns_synthesize_answer( |
598 | q->manager, | |
599 | q->question_utf8, | |
600 | q->ifindex, | |
dd0bc0f1 | 601 | &answer); |
acf06088 LP |
602 | if (r == -ENXIO) { |
603 | /* If we get ENXIO this tells us to generate NXDOMAIN unconditionally. */ | |
2a1037af | 604 | |
acf06088 LP |
605 | dns_query_reset_answer(q); |
606 | q->answer_rcode = DNS_RCODE_NXDOMAIN; | |
607 | q->answer_protocol = dns_synthesize_protocol(q->flags); | |
608 | q->answer_family = dns_synthesize_family(q->flags); | |
609 | q->answer_authenticated = true; | |
610 | *state = DNS_TRANSACTION_RCODE_FAILURE; | |
611 | ||
612 | return 0; | |
613 | } | |
839a4a20 LP |
614 | if (r <= 0) |
615 | return r; | |
2a1037af | 616 | |
839a4a20 | 617 | dns_query_reset_answer(q); |
2a1037af | 618 | |
1cc6c93a | 619 | q->answer = TAKE_PTR(answer); |
2a1037af | 620 | q->answer_rcode = DNS_RCODE_SUCCESS; |
dd0bc0f1 LP |
621 | q->answer_protocol = dns_synthesize_protocol(q->flags); |
622 | q->answer_family = dns_synthesize_family(q->flags); | |
839a4a20 | 623 | q->answer_authenticated = true; |
2a1037af LP |
624 | |
625 | *state = DNS_TRANSACTION_SUCCESS; | |
78c6a153 LP |
626 | |
627 | return 1; | |
2a1037af LP |
628 | } |
629 | ||
dd0bc0f1 LP |
630 | static int dns_query_try_etc_hosts(DnsQuery *q) { |
631 | _cleanup_(dns_answer_unrefp) DnsAnswer *answer = NULL; | |
632 | int r; | |
633 | ||
634 | assert(q); | |
635 | ||
636 | /* Looks in /etc/hosts for matching entries. Note that this is done *before* the normal lookup is done. The | |
637 | * data from /etc/hosts hence takes precedence over the network. */ | |
638 | ||
639 | r = manager_etc_hosts_lookup( | |
640 | q->manager, | |
641 | q->question_utf8, | |
642 | &answer); | |
643 | if (r <= 0) | |
644 | return r; | |
645 | ||
646 | dns_query_reset_answer(q); | |
647 | ||
1cc6c93a | 648 | q->answer = TAKE_PTR(answer); |
dd0bc0f1 LP |
649 | q->answer_rcode = DNS_RCODE_SUCCESS; |
650 | q->answer_protocol = dns_synthesize_protocol(q->flags); | |
651 | q->answer_family = dns_synthesize_family(q->flags); | |
652 | q->answer_authenticated = true; | |
653 | ||
654 | return 1; | |
655 | } | |
656 | ||
322345fd | 657 | int dns_query_go(DnsQuery *q) { |
8ba9fd9c LP |
658 | DnsScopeMatch found = DNS_SCOPE_NO; |
659 | DnsScope *s, *first = NULL; | |
801ad6a6 | 660 | DnsQueryCandidate *c; |
8ba9fd9c LP |
661 | int r; |
662 | ||
663 | assert(q); | |
664 | ||
ec2c5e43 | 665 | if (q->state != DNS_TRANSACTION_NULL) |
8ba9fd9c LP |
666 | return 0; |
667 | ||
dd0bc0f1 LP |
668 | r = dns_query_try_etc_hosts(q); |
669 | if (r < 0) | |
670 | return r; | |
671 | if (r > 0) { | |
672 | dns_query_complete(q, DNS_TRANSACTION_SUCCESS); | |
673 | return 1; | |
674 | } | |
675 | ||
8ba9fd9c | 676 | LIST_FOREACH(scopes, s, q->manager->dns_scopes) { |
74b2466e | 677 | DnsScopeMatch match; |
23b298bc LP |
678 | const char *name; |
679 | ||
680 | name = dns_question_first_name(dns_query_question_for_protocol(q, s->protocol)); | |
681 | if (!name) | |
682 | continue; | |
74b2466e | 683 | |
51323288 | 684 | match = dns_scope_good_domain(s, q->ifindex, q->flags, name); |
a97a3b25 LP |
685 | if (match < 0) { |
686 | log_debug("Couldn't check if '%s' matches against scope, ignoring.", name); | |
74b2466e | 687 | continue; |
a97a3b25 | 688 | } |
74b2466e | 689 | |
a97a3b25 LP |
690 | if (match > found) { /* Does this match better? If so, remember how well it matched, and the first one |
691 | * that matches this well */ | |
692 | found = match; | |
74b2466e | 693 | first = s; |
74b2466e LP |
694 | } |
695 | } | |
696 | ||
2a1037af LP |
697 | if (found == DNS_SCOPE_NO) { |
698 | DnsTransactionState state = DNS_TRANSACTION_NO_SERVERS; | |
699 | ||
7cc6ed7b LP |
700 | r = dns_query_synthesize_reply(q, &state); |
701 | if (r < 0) | |
702 | return r; | |
703 | ||
d634711b LP |
704 | dns_query_complete(q, state); |
705 | return 1; | |
2a1037af | 706 | } |
74b2466e | 707 | |
801ad6a6 | 708 | r = dns_query_add_candidate(q, first); |
74b2466e | 709 | if (r < 0) |
ec2c5e43 | 710 | goto fail; |
74b2466e | 711 | |
74b2466e LP |
712 | LIST_FOREACH(scopes, s, first->scopes_next) { |
713 | DnsScopeMatch match; | |
23b298bc LP |
714 | const char *name; |
715 | ||
716 | name = dns_question_first_name(dns_query_question_for_protocol(q, s->protocol)); | |
717 | if (!name) | |
718 | continue; | |
74b2466e | 719 | |
51323288 | 720 | match = dns_scope_good_domain(s, q->ifindex, q->flags, name); |
a97a3b25 | 721 | if (match < 0) { |
4605de11 | 722 | log_debug("Couldn't check if '%s' matches against scope, ignoring.", name); |
a97a3b25 LP |
723 | continue; |
724 | } | |
74b2466e | 725 | |
a97a3b25 | 726 | if (match < found) |
74b2466e LP |
727 | continue; |
728 | ||
801ad6a6 | 729 | r = dns_query_add_candidate(q, s); |
74b2466e | 730 | if (r < 0) |
ec2c5e43 | 731 | goto fail; |
74b2466e LP |
732 | } |
733 | ||
ab88b6d0 | 734 | dns_query_reset_answer(q); |
74b2466e | 735 | |
9a015429 LP |
736 | r = sd_event_add_time( |
737 | q->manager->event, | |
738 | &q->timeout_event_source, | |
739 | clock_boottime_or_monotonic(), | |
4cbfd62b MCO |
740 | now(clock_boottime_or_monotonic()) + SD_RESOLVED_QUERY_TIMEOUT_USEC, |
741 | 0, on_query_timeout, q); | |
74b2466e LP |
742 | if (r < 0) |
743 | goto fail; | |
744 | ||
aa4a9deb LP |
745 | (void) sd_event_source_set_description(q->timeout_event_source, "query-timeout"); |
746 | ||
ec2c5e43 | 747 | q->state = DNS_TRANSACTION_PENDING; |
faa133f3 | 748 | q->block_ready++; |
74b2466e | 749 | |
801ad6a6 LP |
750 | /* Start the transactions */ |
751 | LIST_FOREACH(candidates_by_query, c, q->candidates) { | |
752 | r = dns_query_candidate_go(c); | |
753 | if (r < 0) { | |
754 | q->block_ready--; | |
ec2c5e43 | 755 | goto fail; |
801ad6a6 | 756 | } |
74b2466e LP |
757 | } |
758 | ||
faa133f3 LP |
759 | q->block_ready--; |
760 | dns_query_ready(q); | |
322345fd | 761 | |
8ba9fd9c | 762 | return 1; |
74b2466e LP |
763 | |
764 | fail: | |
8ba9fd9c | 765 | dns_query_stop(q); |
74b2466e LP |
766 | return r; |
767 | } | |
768 | ||
801ad6a6 | 769 | static void dns_query_accept(DnsQuery *q, DnsQueryCandidate *c) { |
ec2c5e43 | 770 | DnsTransactionState state = DNS_TRANSACTION_NO_SERVERS; |
547973de | 771 | bool has_authenticated = false, has_non_authenticated = false; |
019036a4 | 772 | DnssecResult dnssec_result_authenticated = _DNSSEC_RESULT_INVALID, dnssec_result_non_authenticated = _DNSSEC_RESULT_INVALID; |
801ad6a6 | 773 | DnsTransaction *t; |
faa133f3 | 774 | Iterator i; |
547973de | 775 | int r; |
74b2466e LP |
776 | |
777 | assert(q); | |
778 | ||
801ad6a6 | 779 | if (!c) { |
7cc6ed7b LP |
780 | r = dns_query_synthesize_reply(q, &state); |
781 | if (r < 0) | |
782 | goto fail; | |
783 | ||
801ad6a6 | 784 | dns_query_complete(q, state); |
74b2466e | 785 | return; |
801ad6a6 | 786 | } |
74b2466e | 787 | |
a7bf2ada LP |
788 | if (c->error_code != 0) { |
789 | /* If the candidate had an error condition of its own, start with that. */ | |
790 | state = DNS_TRANSACTION_ERRNO; | |
791 | q->answer = dns_answer_unref(q->answer); | |
792 | q->answer_rcode = 0; | |
793 | q->answer_dnssec_result = _DNSSEC_RESULT_INVALID; | |
cbb1aabb | 794 | q->answer_authenticated = false; |
a7bf2ada LP |
795 | q->answer_errno = c->error_code; |
796 | } | |
797 | ||
801ad6a6 | 798 | SET_FOREACH(t, c->transactions, i) { |
74b2466e | 799 | |
801ad6a6 | 800 | switch (t->state) { |
934e9b10 | 801 | |
801ad6a6 | 802 | case DNS_TRANSACTION_SUCCESS: { |
f8e2f4d6 | 803 | /* We found a successfully reply, merge it into the answer */ |
547973de | 804 | r = dns_answer_extend(&q->answer, t->answer); |
7cc6ed7b LP |
805 | if (r < 0) |
806 | goto fail; | |
019036a4 | 807 | |
ae6a4bbf | 808 | q->answer_rcode = t->answer_rcode; |
7cc6ed7b | 809 | q->answer_errno = 0; |
801ad6a6 | 810 | |
019036a4 | 811 | if (t->answer_authenticated) { |
931851e8 | 812 | has_authenticated = true; |
019036a4 LP |
813 | dnssec_result_authenticated = t->answer_dnssec_result; |
814 | } else { | |
931851e8 | 815 | has_non_authenticated = true; |
019036a4 LP |
816 | dnssec_result_non_authenticated = t->answer_dnssec_result; |
817 | } | |
931851e8 | 818 | |
801ad6a6 LP |
819 | state = DNS_TRANSACTION_SUCCESS; |
820 | break; | |
821 | } | |
822 | ||
801ad6a6 | 823 | case DNS_TRANSACTION_NULL: |
547973de LP |
824 | case DNS_TRANSACTION_PENDING: |
825 | case DNS_TRANSACTION_VALIDATING: | |
801ad6a6 LP |
826 | case DNS_TRANSACTION_ABORTED: |
827 | /* Ignore transactions that didn't complete */ | |
828 | continue; | |
829 | ||
830 | default: | |
cbb1aabb | 831 | /* Any kind of failure? Store the data away, if there's nothing stored yet. */ |
019036a4 LP |
832 | if (state == DNS_TRANSACTION_SUCCESS) |
833 | continue; | |
934e9b10 | 834 | |
cbb1aabb LP |
835 | /* If there's already an authenticated negative reply stored, then prefer that over any unauthenticated one */ |
836 | if (q->answer_authenticated && !t->answer_authenticated) | |
837 | continue; | |
838 | ||
d38d5ca6 | 839 | q->answer = dns_answer_unref(q->answer); |
019036a4 LP |
840 | q->answer_rcode = t->answer_rcode; |
841 | q->answer_dnssec_result = t->answer_dnssec_result; | |
cbb1aabb | 842 | q->answer_authenticated = t->answer_authenticated; |
7cc6ed7b | 843 | q->answer_errno = t->answer_errno; |
934e9b10 | 844 | |
019036a4 | 845 | state = t->state; |
801ad6a6 | 846 | break; |
74b2466e | 847 | } |
801ad6a6 | 848 | } |
74b2466e | 849 | |
019036a4 LP |
850 | if (state == DNS_TRANSACTION_SUCCESS) { |
851 | q->answer_authenticated = has_authenticated && !has_non_authenticated; | |
852 | q->answer_dnssec_result = q->answer_authenticated ? dnssec_result_authenticated : dnssec_result_non_authenticated; | |
853 | } | |
854 | ||
801ad6a6 LP |
855 | q->answer_protocol = c->scope->protocol; |
856 | q->answer_family = c->scope->family; | |
934e9b10 | 857 | |
801ad6a6 LP |
858 | dns_search_domain_unref(q->answer_search_domain); |
859 | q->answer_search_domain = dns_search_domain_ref(c->search_domain); | |
7e8e0422 | 860 | |
7cc6ed7b LP |
861 | r = dns_query_synthesize_reply(q, &state); |
862 | if (r < 0) | |
863 | goto fail; | |
864 | ||
801ad6a6 | 865 | dns_query_complete(q, state); |
7cc6ed7b LP |
866 | return; |
867 | ||
868 | fail: | |
869 | q->answer_errno = -r; | |
870 | dns_query_complete(q, DNS_TRANSACTION_ERRNO); | |
801ad6a6 | 871 | } |
934e9b10 | 872 | |
801ad6a6 | 873 | void dns_query_ready(DnsQuery *q) { |
74b2466e | 874 | |
801ad6a6 LP |
875 | DnsQueryCandidate *bad = NULL, *c; |
876 | bool pending = false; | |
74b2466e | 877 | |
801ad6a6 | 878 | assert(q); |
547973de | 879 | assert(DNS_TRANSACTION_IS_LIVE(q->state)); |
e4501ed4 | 880 | |
801ad6a6 LP |
881 | /* Note that this call might invalidate the query. Callers |
882 | * should hence not attempt to access the query or transaction | |
883 | * after calling this function, unless the block_ready | |
884 | * counter was explicitly bumped before doing so. */ | |
885 | ||
886 | if (q->block_ready > 0) | |
887 | return; | |
888 | ||
889 | LIST_FOREACH(candidates_by_query, c, q->candidates) { | |
890 | DnsTransactionState state; | |
891 | ||
892 | state = dns_query_candidate_state(c); | |
893 | switch (state) { | |
894 | ||
895 | case DNS_TRANSACTION_SUCCESS: | |
547973de | 896 | /* One of the candidates is successful, |
801ad6a6 LP |
897 | * let's use it, and copy its data out */ |
898 | dns_query_accept(q, c); | |
e4501ed4 LP |
899 | return; |
900 | ||
801ad6a6 | 901 | case DNS_TRANSACTION_NULL: |
547973de LP |
902 | case DNS_TRANSACTION_PENDING: |
903 | case DNS_TRANSACTION_VALIDATING: | |
904 | /* One of the candidates is still going on, | |
905 | * let's maybe wait for it */ | |
801ad6a6 LP |
906 | pending = true; |
907 | break; | |
e4501ed4 | 908 | |
801ad6a6 LP |
909 | default: |
910 | /* Any kind of failure */ | |
911 | bad = c; | |
912 | break; | |
913 | } | |
faa133f3 | 914 | } |
74b2466e | 915 | |
801ad6a6 LP |
916 | if (pending) |
917 | return; | |
2a1037af | 918 | |
801ad6a6 | 919 | dns_query_accept(q, bad); |
74b2466e | 920 | } |
8ba9fd9c | 921 | |
45ec7efb | 922 | static int dns_query_cname_redirect(DnsQuery *q, const DnsResourceRecord *cname) { |
23b298bc LP |
923 | _cleanup_(dns_question_unrefp) DnsQuestion *nq_idna = NULL, *nq_utf8 = NULL; |
924 | int r, k; | |
8ba9fd9c LP |
925 | |
926 | assert(q); | |
927 | ||
313cefa1 | 928 | q->n_cname_redirects++; |
faa133f3 | 929 | if (q->n_cname_redirects > CNAME_MAX) |
8ba9fd9c LP |
930 | return -ELOOP; |
931 | ||
23b298bc | 932 | r = dns_question_cname_redirect(q->question_idna, cname, &nq_idna); |
faa133f3 LP |
933 | if (r < 0) |
934 | return r; | |
23b298bc | 935 | else if (r > 0) |
8ec76e6a | 936 | log_debug("Following CNAME/DNAME %s → %s.", dns_question_first_name(q->question_idna), dns_question_first_name(nq_idna)); |
23b298bc LP |
937 | |
938 | k = dns_question_is_equal(q->question_idna, q->question_utf8); | |
939 | if (k < 0) | |
940 | return r; | |
941 | if (k > 0) { | |
942 | /* Same question? Shortcut new question generation */ | |
943 | nq_utf8 = dns_question_ref(nq_idna); | |
944 | k = r; | |
945 | } else { | |
946 | k = dns_question_cname_redirect(q->question_utf8, cname, &nq_utf8); | |
947 | if (k < 0) | |
948 | return k; | |
949 | else if (k > 0) | |
8ec76e6a | 950 | log_debug("Following UTF8 CNAME/DNAME %s → %s.", dns_question_first_name(q->question_utf8), dns_question_first_name(nq_utf8)); |
23b298bc | 951 | } |
8ba9fd9c | 952 | |
23b298bc LP |
953 | if (r == 0 && k == 0) /* No actual cname happened? */ |
954 | return -ELOOP; | |
955 | ||
8e5de09f LP |
956 | if (q->answer_protocol == DNS_PROTOCOL_DNS) { |
957 | /* Don't permit CNAME redirects from unicast DNS to LLMNR or MulticastDNS, so that global resources | |
958 | * cannot invade the local namespace. The opposite way we permit: local names may redirect to global | |
959 | * ones. */ | |
960 | ||
961 | q->flags &= ~(SD_RESOLVED_LLMNR|SD_RESOLVED_MDNS); /* mask away the local protocols */ | |
962 | } | |
963 | ||
964 | /* Turn off searching for the new name */ | |
965 | q->flags |= SD_RESOLVED_NO_SEARCH; | |
966 | ||
23b298bc | 967 | dns_question_unref(q->question_idna); |
1cc6c93a | 968 | q->question_idna = TAKE_PTR(nq_idna); |
bc7669cf | 969 | |
23b298bc | 970 | dns_question_unref(q->question_utf8); |
1cc6c93a | 971 | q->question_utf8 = TAKE_PTR(nq_utf8); |
8ba9fd9c | 972 | |
7820b320 LP |
973 | dns_query_free_candidates(q); |
974 | dns_query_reset_answer(q); | |
322345fd | 975 | |
8e5de09f | 976 | q->state = DNS_TRANSACTION_NULL; |
59a89990 | 977 | |
8ba9fd9c LP |
978 | return 0; |
979 | } | |
82bd6ddd | 980 | |
45ec7efb LP |
981 | int dns_query_process_cname(DnsQuery *q) { |
982 | _cleanup_(dns_resource_record_unrefp) DnsResourceRecord *cname = NULL; | |
23b298bc | 983 | DnsQuestion *question; |
45ec7efb LP |
984 | DnsResourceRecord *rr; |
985 | int r; | |
986 | ||
987 | assert(q); | |
988 | ||
7588460a TG |
989 | if (!IN_SET(q->state, DNS_TRANSACTION_SUCCESS, DNS_TRANSACTION_NULL)) |
990 | return DNS_QUERY_NOMATCH; | |
45ec7efb | 991 | |
23b298bc | 992 | question = dns_query_question_for_protocol(q, q->answer_protocol); |
45ec7efb | 993 | |
23b298bc LP |
994 | DNS_ANSWER_FOREACH(rr, q->answer) { |
995 | r = dns_question_matches_rr(question, rr, DNS_SEARCH_DOMAIN_NAME(q->answer_search_domain)); | |
45ec7efb LP |
996 | if (r < 0) |
997 | return r; | |
998 | if (r > 0) | |
7588460a | 999 | return DNS_QUERY_MATCH; /* The answer matches directly, no need to follow cnames */ |
45ec7efb | 1000 | |
542e0c84 | 1001 | r = dns_question_matches_cname_or_dname(question, rr, DNS_SEARCH_DOMAIN_NAME(q->answer_search_domain)); |
45ec7efb LP |
1002 | if (r < 0) |
1003 | return r; | |
1004 | if (r > 0 && !cname) | |
1005 | cname = dns_resource_record_ref(rr); | |
1006 | } | |
1007 | ||
1008 | if (!cname) | |
7588460a | 1009 | return DNS_QUERY_NOMATCH; /* No match and no cname to follow */ |
45ec7efb LP |
1010 | |
1011 | if (q->flags & SD_RESOLVED_NO_CNAME) | |
1012 | return -ELOOP; | |
1013 | ||
28830a64 LP |
1014 | if (!q->answer_authenticated) |
1015 | q->previous_redirect_unauthenticated = true; | |
1016 | ||
45ec7efb LP |
1017 | /* OK, let's actually follow the CNAME */ |
1018 | r = dns_query_cname_redirect(q, cname); | |
1019 | if (r < 0) | |
1020 | return r; | |
1021 | ||
1022 | /* Let's see if the answer can already answer the new | |
1023 | * redirected question */ | |
7588460a TG |
1024 | r = dns_query_process_cname(q); |
1025 | if (r != DNS_QUERY_NOMATCH) | |
1026 | return r; | |
45ec7efb LP |
1027 | |
1028 | /* OK, it cannot, let's begin with the new query */ | |
1029 | r = dns_query_go(q); | |
1030 | if (r < 0) | |
1031 | return r; | |
1032 | ||
7588460a | 1033 | return DNS_QUERY_RESTARTED; /* We restarted the query for a new cname */ |
45ec7efb LP |
1034 | } |
1035 | ||
82bd6ddd LP |
1036 | static int on_bus_track(sd_bus_track *t, void *userdata) { |
1037 | DnsQuery *q = userdata; | |
1038 | ||
1039 | assert(t); | |
1040 | assert(q); | |
1041 | ||
1042 | log_debug("Client of active query vanished, aborting query."); | |
1043 | dns_query_complete(q, DNS_TRANSACTION_ABORTED); | |
1044 | return 0; | |
1045 | } | |
1046 | ||
966c66e3 | 1047 | int dns_query_bus_track(DnsQuery *q, sd_bus_message *m) { |
82bd6ddd LP |
1048 | int r; |
1049 | ||
1050 | assert(q); | |
1051 | assert(m); | |
1052 | ||
1053 | if (!q->bus_track) { | |
966c66e3 | 1054 | r = sd_bus_track_new(sd_bus_message_get_bus(m), &q->bus_track, on_bus_track, q); |
82bd6ddd LP |
1055 | if (r < 0) |
1056 | return r; | |
1057 | } | |
1058 | ||
1059 | r = sd_bus_track_add_sender(q->bus_track, m); | |
1060 | if (r < 0) | |
1061 | return r; | |
1062 | ||
1063 | return 0; | |
1064 | } | |
23b298bc LP |
1065 | |
1066 | DnsQuestion* dns_query_question_for_protocol(DnsQuery *q, DnsProtocol protocol) { | |
1067 | assert(q); | |
1068 | ||
1069 | switch (protocol) { | |
1070 | ||
1071 | case DNS_PROTOCOL_DNS: | |
1072 | return q->question_idna; | |
1073 | ||
1074 | case DNS_PROTOCOL_MDNS: | |
1075 | case DNS_PROTOCOL_LLMNR: | |
1076 | return q->question_utf8; | |
1077 | ||
1078 | default: | |
1079 | return NULL; | |
1080 | } | |
1081 | } | |
1082 | ||
1083 | const char *dns_query_string(DnsQuery *q) { | |
1084 | const char *name; | |
1085 | int r; | |
1086 | ||
1087 | /* Returns a somewhat useful human-readable lookup key string for this query */ | |
1088 | ||
1089 | if (q->request_address_string) | |
1090 | return q->request_address_string; | |
1091 | ||
1092 | if (q->request_address_valid) { | |
1093 | r = in_addr_to_string(q->request_family, &q->request_address, &q->request_address_string); | |
1094 | if (r >= 0) | |
1095 | return q->request_address_string; | |
1096 | } | |
1097 | ||
1098 | name = dns_question_first_name(q->question_utf8); | |
1099 | if (name) | |
1100 | return name; | |
1101 | ||
1102 | return dns_question_first_name(q->question_idna); | |
1103 | } | |
28830a64 LP |
1104 | |
1105 | bool dns_query_fully_authenticated(DnsQuery *q) { | |
1106 | assert(q); | |
1107 | ||
1108 | return q->answer_authenticated && !q->previous_redirect_unauthenticated; | |
1109 | } |