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Commit | Line | Data |
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74b2466e LP |
1 | /*** |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright 2014 Lennart Poettering | |
5 | ||
6 | systemd is free software; you can redistribute it and/or modify it | |
7 | under the terms of the GNU Lesser General Public License as published by | |
8 | the Free Software Foundation; either version 2.1 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | systemd is distributed in the hope that it will be useful, but | |
12 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public License | |
17 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
18 | ***/ | |
19 | ||
b5efdb8a | 20 | #include "alloc-util.h" |
2a1037af | 21 | #include "dns-domain.h" |
011696f7 | 22 | #include "dns-type.h" |
b5efdb8a | 23 | #include "hostname-util.h" |
78c6a153 | 24 | #include "local-addresses.h" |
74b2466e | 25 | #include "resolved-dns-query.h" |
839a4a20 | 26 | #include "resolved-dns-synthesize.h" |
dd0bc0f1 | 27 | #include "resolved-etc-hosts.h" |
23b298bc | 28 | #include "string-util.h" |
74b2466e | 29 | |
0c903ae7 | 30 | /* How long to wait for the query in total */ |
74b2466e | 31 | #define QUERY_TIMEOUT_USEC (30 * USEC_PER_SEC) |
0c903ae7 | 32 | |
8ba9fd9c | 33 | #define CNAME_MAX 8 |
39762fdf | 34 | #define QUERIES_MAX 2048 |
45ec7efb | 35 | #define AUXILIARY_QUERIES_MAX 64 |
8ba9fd9c | 36 | |
801ad6a6 LP |
37 | static int dns_query_candidate_new(DnsQueryCandidate **ret, DnsQuery *q, DnsScope *s) { |
38 | DnsQueryCandidate *c; | |
74b2466e | 39 | |
801ad6a6 | 40 | assert(ret); |
faa133f3 | 41 | assert(q); |
801ad6a6 | 42 | assert(s); |
74b2466e | 43 | |
801ad6a6 LP |
44 | c = new0(DnsQueryCandidate, 1); |
45 | if (!c) | |
46 | return -ENOMEM; | |
47 | ||
48 | c->query = q; | |
49 | c->scope = s; | |
50 | ||
51 | LIST_PREPEND(candidates_by_query, q->candidates, c); | |
52 | LIST_PREPEND(candidates_by_scope, s->query_candidates, c); | |
53 | ||
54 | *ret = c; | |
55 | return 0; | |
56 | } | |
57 | ||
58 | static void dns_query_candidate_stop(DnsQueryCandidate *c) { | |
59 | DnsTransaction *t; | |
74b2466e | 60 | |
801ad6a6 LP |
61 | assert(c); |
62 | ||
63 | while ((t = set_steal_first(c->transactions))) { | |
547973de | 64 | set_remove(t->notify_query_candidates, c); |
35aa04e9 | 65 | set_remove(t->notify_query_candidates_done, c); |
ec2c5e43 | 66 | dns_transaction_gc(t); |
74b2466e | 67 | } |
74b2466e LP |
68 | } |
69 | ||
801ad6a6 LP |
70 | DnsQueryCandidate* dns_query_candidate_free(DnsQueryCandidate *c) { |
71 | ||
72 | if (!c) | |
73 | return NULL; | |
74 | ||
75 | dns_query_candidate_stop(c); | |
76 | ||
77 | set_free(c->transactions); | |
78 | dns_search_domain_unref(c->search_domain); | |
79 | ||
80 | if (c->query) | |
81 | LIST_REMOVE(candidates_by_query, c->query->candidates, c); | |
82 | ||
83 | if (c->scope) | |
84 | LIST_REMOVE(candidates_by_scope, c->scope->query_candidates, c); | |
85 | ||
86 | free(c); | |
87 | ||
88 | return NULL; | |
89 | } | |
90 | ||
91 | static int dns_query_candidate_next_search_domain(DnsQueryCandidate *c) { | |
801ad6a6 LP |
92 | DnsSearchDomain *next = NULL; |
93 | ||
94 | assert(c); | |
95 | ||
ad44b56b | 96 | if (c->search_domain && c->search_domain->linked) |
801ad6a6 | 97 | next = c->search_domain->domains_next; |
ad44b56b LP |
98 | else |
99 | next = dns_scope_get_search_domains(c->scope); | |
801ad6a6 | 100 | |
ad44b56b | 101 | for (;;) { |
6627b7e2 LP |
102 | if (!next) /* We hit the end of the list */ |
103 | return 0; | |
801ad6a6 | 104 | |
ad44b56b LP |
105 | if (!next->route_only) |
106 | break; | |
801ad6a6 | 107 | |
ad44b56b LP |
108 | /* Skip over route-only domains */ |
109 | next = next->domains_next; | |
801ad6a6 LP |
110 | } |
111 | ||
112 | dns_search_domain_unref(c->search_domain); | |
113 | c->search_domain = dns_search_domain_ref(next); | |
6627b7e2 | 114 | |
801ad6a6 LP |
115 | return 1; |
116 | } | |
117 | ||
118 | static int dns_query_candidate_add_transaction(DnsQueryCandidate *c, DnsResourceKey *key) { | |
119 | DnsTransaction *t; | |
120 | int r; | |
121 | ||
122 | assert(c); | |
123 | assert(key); | |
124 | ||
801ad6a6 LP |
125 | t = dns_scope_find_transaction(c->scope, key, true); |
126 | if (!t) { | |
127 | r = dns_transaction_new(&t, c->scope, key); | |
128 | if (r < 0) | |
129 | return r; | |
547973de LP |
130 | } else { |
131 | if (set_contains(c->transactions, t)) | |
132 | return 0; | |
801ad6a6 LP |
133 | } |
134 | ||
547973de LP |
135 | r = set_ensure_allocated(&c->transactions, NULL); |
136 | if (r < 0) | |
137 | goto gc; | |
138 | ||
139 | r = set_ensure_allocated(&t->notify_query_candidates, NULL); | |
801ad6a6 LP |
140 | if (r < 0) |
141 | goto gc; | |
142 | ||
35aa04e9 LP |
143 | r = set_ensure_allocated(&t->notify_query_candidates_done, NULL); |
144 | if (r < 0) | |
145 | goto gc; | |
146 | ||
547973de | 147 | r = set_put(t->notify_query_candidates, c); |
801ad6a6 LP |
148 | if (r < 0) |
149 | goto gc; | |
150 | ||
151 | r = set_put(c->transactions, t); | |
152 | if (r < 0) { | |
547973de | 153 | (void) set_remove(t->notify_query_candidates, c); |
801ad6a6 LP |
154 | goto gc; |
155 | } | |
156 | ||
17c8de63 | 157 | t->clamp_ttl = c->query->clamp_ttl; |
547973de | 158 | return 1; |
801ad6a6 LP |
159 | |
160 | gc: | |
161 | dns_transaction_gc(t); | |
162 | return r; | |
163 | } | |
164 | ||
165 | static int dns_query_candidate_go(DnsQueryCandidate *c) { | |
166 | DnsTransaction *t; | |
167 | Iterator i; | |
168 | int r; | |
011696f7 | 169 | unsigned n = 0; |
801ad6a6 LP |
170 | |
171 | assert(c); | |
172 | ||
173 | /* Start the transactions that are not started yet */ | |
174 | SET_FOREACH(t, c->transactions, i) { | |
175 | if (t->state != DNS_TRANSACTION_NULL) | |
176 | continue; | |
177 | ||
178 | r = dns_transaction_go(t); | |
179 | if (r < 0) | |
180 | return r; | |
011696f7 LP |
181 | |
182 | n++; | |
801ad6a6 LP |
183 | } |
184 | ||
011696f7 LP |
185 | /* If there was nothing to start, then let's proceed immediately */ |
186 | if (n == 0) | |
187 | dns_query_candidate_notify(c); | |
188 | ||
801ad6a6 LP |
189 | return 0; |
190 | } | |
191 | ||
192 | static DnsTransactionState dns_query_candidate_state(DnsQueryCandidate *c) { | |
193 | DnsTransactionState state = DNS_TRANSACTION_NO_SERVERS; | |
194 | DnsTransaction *t; | |
195 | Iterator i; | |
196 | ||
197 | assert(c); | |
198 | ||
199 | if (c->error_code != 0) | |
7cc6ed7b | 200 | return DNS_TRANSACTION_ERRNO; |
801ad6a6 LP |
201 | |
202 | SET_FOREACH(t, c->transactions, i) { | |
203 | ||
204 | switch (t->state) { | |
205 | ||
5264131a LP |
206 | case DNS_TRANSACTION_NULL: |
207 | /* If there's a NULL transaction pending, then | |
208 | * this means not all transactions where | |
209 | * started yet, and we were called from within | |
210 | * the stackframe that is supposed to start | |
211 | * remaining transactions. In this case, | |
212 | * simply claim the candidate is pending. */ | |
213 | ||
801ad6a6 | 214 | case DNS_TRANSACTION_PENDING: |
547973de LP |
215 | case DNS_TRANSACTION_VALIDATING: |
216 | /* If there's one transaction currently in | |
217 | * VALIDATING state, then this means there's | |
218 | * also one in PENDING state, hence we can | |
219 | * return PENDING immediately. */ | |
220 | return DNS_TRANSACTION_PENDING; | |
801ad6a6 LP |
221 | |
222 | case DNS_TRANSACTION_SUCCESS: | |
223 | state = t->state; | |
224 | break; | |
225 | ||
226 | default: | |
227 | if (state != DNS_TRANSACTION_SUCCESS) | |
228 | state = t->state; | |
229 | ||
230 | break; | |
231 | } | |
232 | } | |
233 | ||
234 | return state; | |
235 | } | |
236 | ||
011696f7 LP |
237 | static bool dns_query_candidate_is_routable(DnsQueryCandidate *c, uint16_t type) { |
238 | int family; | |
239 | ||
240 | assert(c); | |
241 | ||
242 | /* Checks whether the specified RR type matches an address family that is routable on the link(s) the scope of | |
243 | * this candidate belongs to. Specifically, whether there's a routable IPv4 address on it if we query an A RR, | |
244 | * or a routable IPv6 address if we query an AAAA RR. */ | |
245 | ||
246 | if (!c->query->suppress_unroutable_family) | |
247 | return true; | |
248 | ||
249 | if (c->scope->protocol != DNS_PROTOCOL_DNS) | |
250 | return true; | |
251 | ||
252 | family = dns_type_to_af(type); | |
253 | if (family < 0) | |
254 | return true; | |
255 | ||
256 | if (c->scope->link) | |
257 | return link_relevant(c->scope->link, family, false); | |
258 | else | |
259 | return manager_routable(c->scope->manager, family); | |
260 | } | |
261 | ||
801ad6a6 | 262 | static int dns_query_candidate_setup_transactions(DnsQueryCandidate *c) { |
23b298bc | 263 | DnsQuestion *question; |
801ad6a6 LP |
264 | DnsResourceKey *key; |
265 | int n = 0, r; | |
266 | ||
267 | assert(c); | |
268 | ||
269 | dns_query_candidate_stop(c); | |
270 | ||
23b298bc LP |
271 | question = dns_query_question_for_protocol(c->query, c->scope->protocol); |
272 | ||
801ad6a6 | 273 | /* Create one transaction per question key */ |
23b298bc | 274 | DNS_QUESTION_FOREACH(key, question) { |
801ad6a6 | 275 | _cleanup_(dns_resource_key_unrefp) DnsResourceKey *new_key = NULL; |
011696f7 LP |
276 | DnsResourceKey *qkey; |
277 | ||
278 | if (!dns_query_candidate_is_routable(c, key->type)) | |
279 | continue; | |
801ad6a6 LP |
280 | |
281 | if (c->search_domain) { | |
282 | r = dns_resource_key_new_append_suffix(&new_key, key, c->search_domain->name); | |
283 | if (r < 0) | |
284 | goto fail; | |
801ad6a6 | 285 | |
011696f7 LP |
286 | qkey = new_key; |
287 | } else | |
288 | qkey = key; | |
289 | ||
290 | if (!dns_scope_good_key(c->scope, qkey)) | |
291 | continue; | |
292 | ||
293 | r = dns_query_candidate_add_transaction(c, qkey); | |
801ad6a6 LP |
294 | if (r < 0) |
295 | goto fail; | |
296 | ||
297 | n++; | |
298 | } | |
299 | ||
300 | return n; | |
301 | ||
302 | fail: | |
303 | dns_query_candidate_stop(c); | |
304 | return r; | |
305 | } | |
306 | ||
547973de | 307 | void dns_query_candidate_notify(DnsQueryCandidate *c) { |
801ad6a6 LP |
308 | DnsTransactionState state; |
309 | int r; | |
310 | ||
311 | assert(c); | |
312 | ||
313 | state = dns_query_candidate_state(c); | |
314 | ||
547973de | 315 | if (DNS_TRANSACTION_IS_LIVE(state)) |
801ad6a6 LP |
316 | return; |
317 | ||
318 | if (state != DNS_TRANSACTION_SUCCESS && c->search_domain) { | |
319 | ||
320 | r = dns_query_candidate_next_search_domain(c); | |
321 | if (r < 0) | |
322 | goto fail; | |
323 | ||
324 | if (r > 0) { | |
325 | /* OK, there's another search domain to try, let's do so. */ | |
326 | ||
327 | r = dns_query_candidate_setup_transactions(c); | |
328 | if (r < 0) | |
329 | goto fail; | |
330 | ||
331 | if (r > 0) { | |
332 | /* New transactions where queued. Start them and wait */ | |
333 | ||
334 | r = dns_query_candidate_go(c); | |
335 | if (r < 0) | |
336 | goto fail; | |
337 | ||
338 | return; | |
339 | } | |
340 | } | |
341 | ||
342 | } | |
343 | ||
344 | dns_query_ready(c->query); | |
345 | return; | |
346 | ||
347 | fail: | |
348 | log_warning_errno(r, "Failed to follow search domains: %m"); | |
349 | c->error_code = r; | |
350 | dns_query_ready(c->query); | |
351 | } | |
352 | ||
353 | static void dns_query_stop(DnsQuery *q) { | |
354 | DnsQueryCandidate *c; | |
355 | ||
356 | assert(q); | |
357 | ||
358 | q->timeout_event_source = sd_event_source_unref(q->timeout_event_source); | |
359 | ||
360 | LIST_FOREACH(candidates_by_query, c, q->candidates) | |
361 | dns_query_candidate_stop(c); | |
362 | } | |
363 | ||
7820b320 LP |
364 | static void dns_query_free_candidates(DnsQuery *q) { |
365 | assert(q); | |
366 | ||
367 | while (q->candidates) | |
368 | dns_query_candidate_free(q->candidates); | |
369 | } | |
370 | ||
371 | static void dns_query_reset_answer(DnsQuery *q) { | |
372 | assert(q); | |
373 | ||
374 | q->answer = dns_answer_unref(q->answer); | |
375 | q->answer_rcode = 0; | |
376 | q->answer_dnssec_result = _DNSSEC_RESULT_INVALID; | |
7cc6ed7b | 377 | q->answer_errno = 0; |
7820b320 LP |
378 | q->answer_authenticated = false; |
379 | q->answer_protocol = _DNS_PROTOCOL_INVALID; | |
380 | q->answer_family = AF_UNSPEC; | |
381 | q->answer_search_domain = dns_search_domain_unref(q->answer_search_domain); | |
382 | } | |
383 | ||
74b2466e | 384 | DnsQuery *dns_query_free(DnsQuery *q) { |
74b2466e LP |
385 | if (!q) |
386 | return NULL; | |
387 | ||
45ec7efb LP |
388 | while (q->auxiliary_queries) |
389 | dns_query_free(q->auxiliary_queries); | |
390 | ||
391 | if (q->auxiliary_for) { | |
392 | assert(q->auxiliary_for->n_auxiliary_queries > 0); | |
393 | q->auxiliary_for->n_auxiliary_queries--; | |
394 | LIST_REMOVE(auxiliary_queries, q->auxiliary_for->auxiliary_queries, q); | |
395 | } | |
396 | ||
7820b320 | 397 | dns_query_free_candidates(q); |
322345fd | 398 | |
23b298bc LP |
399 | dns_question_unref(q->question_idna); |
400 | dns_question_unref(q->question_utf8); | |
7820b320 LP |
401 | |
402 | dns_query_reset_answer(q); | |
322345fd | 403 | |
ec2c5e43 | 404 | sd_bus_message_unref(q->request); |
82bd6ddd | 405 | sd_bus_track_unref(q->bus_track); |
74b2466e | 406 | |
23b298bc LP |
407 | free(q->request_address_string); |
408 | ||
39762fdf | 409 | if (q->manager) { |
74b2466e | 410 | LIST_REMOVE(queries, q->manager->dns_queries, q); |
39762fdf LP |
411 | q->manager->n_dns_queries--; |
412 | } | |
74b2466e | 413 | |
74b2466e LP |
414 | free(q); |
415 | ||
416 | return NULL; | |
417 | } | |
418 | ||
23b298bc LP |
419 | int dns_query_new( |
420 | Manager *m, | |
421 | DnsQuery **ret, | |
422 | DnsQuestion *question_utf8, | |
423 | DnsQuestion *question_idna, | |
17c8de63 LP |
424 | int ifindex, |
425 | uint64_t flags) { | |
23b298bc | 426 | |
74b2466e | 427 | _cleanup_(dns_query_freep) DnsQuery *q = NULL; |
23b298bc LP |
428 | DnsResourceKey *key; |
429 | bool good = false; | |
faa133f3 | 430 | int r; |
202b76ae | 431 | char key_str[DNS_RESOURCE_KEY_STRING_MAX]; |
74b2466e LP |
432 | |
433 | assert(m); | |
434 | ||
23b298bc LP |
435 | if (dns_question_size(question_utf8) > 0) { |
436 | r = dns_question_is_valid_for_query(question_utf8); | |
437 | if (r < 0) | |
438 | return r; | |
439 | if (r == 0) | |
440 | return -EINVAL; | |
441 | ||
442 | good = true; | |
443 | } | |
444 | ||
445 | /* If the IDNA and UTF8 questions are the same, merge their references */ | |
446 | r = dns_question_is_equal(question_idna, question_utf8); | |
faa133f3 LP |
447 | if (r < 0) |
448 | return r; | |
23b298bc LP |
449 | if (r > 0) |
450 | question_idna = question_utf8; | |
451 | else { | |
452 | if (dns_question_size(question_idna) > 0) { | |
453 | r = dns_question_is_valid_for_query(question_idna); | |
454 | if (r < 0) | |
455 | return r; | |
456 | if (r == 0) | |
457 | return -EINVAL; | |
458 | ||
459 | good = true; | |
460 | } | |
461 | } | |
462 | ||
463 | if (!good) /* don't allow empty queries */ | |
464 | return -EINVAL; | |
74b2466e | 465 | |
39762fdf LP |
466 | if (m->n_dns_queries >= QUERIES_MAX) |
467 | return -EBUSY; | |
468 | ||
74b2466e LP |
469 | q = new0(DnsQuery, 1); |
470 | if (!q) | |
471 | return -ENOMEM; | |
472 | ||
23b298bc LP |
473 | q->question_utf8 = dns_question_ref(question_utf8); |
474 | q->question_idna = dns_question_ref(question_idna); | |
51323288 LP |
475 | q->ifindex = ifindex; |
476 | q->flags = flags; | |
7820b320 | 477 | q->answer_dnssec_result = _DNSSEC_RESULT_INVALID; |
801ad6a6 | 478 | q->answer_protocol = _DNS_PROTOCOL_INVALID; |
7820b320 | 479 | q->answer_family = AF_UNSPEC; |
322345fd | 480 | |
23b298bc | 481 | /* First dump UTF8 question */ |
202b76ae ZJS |
482 | DNS_QUESTION_FOREACH(key, question_utf8) |
483 | log_debug("Looking up RR for %s.", | |
484 | dns_resource_key_to_string(key, key_str, sizeof key_str)); | |
23b298bc LP |
485 | |
486 | /* And then dump the IDNA question, but only what hasn't been dumped already through the UTF8 question. */ | |
487 | DNS_QUESTION_FOREACH(key, question_idna) { | |
23b298bc LP |
488 | r = dns_question_contains(question_utf8, key); |
489 | if (r < 0) | |
490 | return r; | |
491 | if (r > 0) | |
492 | continue; | |
493 | ||
202b76ae ZJS |
494 | log_debug("Looking up IDNA RR for %s.", |
495 | dns_resource_key_to_string(key, key_str, sizeof key_str)); | |
74b2466e LP |
496 | } |
497 | ||
498 | LIST_PREPEND(queries, m->dns_queries, q); | |
39762fdf | 499 | m->n_dns_queries++; |
74b2466e LP |
500 | q->manager = m; |
501 | ||
8ba9fd9c LP |
502 | if (ret) |
503 | *ret = q; | |
504 | q = NULL; | |
505 | ||
506 | return 0; | |
507 | } | |
508 | ||
45ec7efb LP |
509 | int dns_query_make_auxiliary(DnsQuery *q, DnsQuery *auxiliary_for) { |
510 | assert(q); | |
511 | assert(auxiliary_for); | |
512 | ||
513 | /* Ensure that that the query is not auxiliary yet, and | |
514 | * nothing else is auxiliary to it either */ | |
515 | assert(!q->auxiliary_for); | |
516 | assert(!q->auxiliary_queries); | |
517 | ||
518 | /* Ensure that the unit we shall be made auxiliary for isn't | |
519 | * auxiliary itself */ | |
520 | assert(!auxiliary_for->auxiliary_for); | |
521 | ||
522 | if (auxiliary_for->n_auxiliary_queries >= AUXILIARY_QUERIES_MAX) | |
523 | return -EAGAIN; | |
524 | ||
525 | LIST_PREPEND(auxiliary_queries, auxiliary_for->auxiliary_queries, q); | |
526 | q->auxiliary_for = auxiliary_for; | |
527 | ||
528 | auxiliary_for->n_auxiliary_queries++; | |
529 | return 0; | |
530 | } | |
531 | ||
ec2c5e43 | 532 | static void dns_query_complete(DnsQuery *q, DnsTransactionState state) { |
8ba9fd9c | 533 | assert(q); |
547973de LP |
534 | assert(!DNS_TRANSACTION_IS_LIVE(state)); |
535 | assert(DNS_TRANSACTION_IS_LIVE(q->state)); | |
8ba9fd9c | 536 | |
322345fd LP |
537 | /* Note that this call might invalidate the query. Callers |
538 | * should hence not attempt to access the query or transaction | |
539 | * after calling this function. */ | |
8ba9fd9c | 540 | |
8ba9fd9c LP |
541 | q->state = state; |
542 | ||
322345fd LP |
543 | dns_query_stop(q); |
544 | if (q->complete) | |
545 | q->complete(q); | |
8ba9fd9c LP |
546 | } |
547 | ||
548 | static int on_query_timeout(sd_event_source *s, usec_t usec, void *userdata) { | |
549 | DnsQuery *q = userdata; | |
550 | ||
551 | assert(s); | |
552 | assert(q); | |
553 | ||
ec2c5e43 | 554 | dns_query_complete(q, DNS_TRANSACTION_TIMEOUT); |
8ba9fd9c LP |
555 | return 0; |
556 | } | |
557 | ||
801ad6a6 LP |
558 | static int dns_query_add_candidate(DnsQuery *q, DnsScope *s) { |
559 | DnsQueryCandidate *c; | |
faa133f3 LP |
560 | int r; |
561 | ||
562 | assert(q); | |
ec2c5e43 | 563 | assert(s); |
faa133f3 | 564 | |
801ad6a6 | 565 | r = dns_query_candidate_new(&c, q, s); |
faa133f3 LP |
566 | if (r < 0) |
567 | return r; | |
568 | ||
801ad6a6 | 569 | /* If this a single-label domain on DNS, we might append a suitable search domain first. */ |
22f711bb | 570 | if ((q->flags & SD_RESOLVED_NO_SEARCH) == 0) { |
23b298bc | 571 | r = dns_scope_name_needs_search_domain(s, dns_question_first_name(q->question_idna)); |
22f711bb | 572 | if (r < 0) |
801ad6a6 | 573 | goto fail; |
22f711bb LP |
574 | if (r > 0) { |
575 | /* OK, we need a search domain now. Let's find one for this scope */ | |
576 | ||
577 | r = dns_query_candidate_next_search_domain(c); | |
578 | if (r <= 0) /* if there's no search domain, then we won't add any transaction. */ | |
579 | goto fail; | |
580 | } | |
faa133f3 LP |
581 | } |
582 | ||
801ad6a6 LP |
583 | r = dns_query_candidate_setup_transactions(c); |
584 | if (r < 0) | |
585 | goto fail; | |
586 | ||
faa133f3 LP |
587 | return 0; |
588 | ||
801ad6a6 LP |
589 | fail: |
590 | dns_query_candidate_free(c); | |
faa133f3 LP |
591 | return r; |
592 | } | |
593 | ||
78c6a153 | 594 | static int dns_query_synthesize_reply(DnsQuery *q, DnsTransactionState *state) { |
2a1037af | 595 | _cleanup_(dns_answer_unrefp) DnsAnswer *answer = NULL; |
dd0bc0f1 | 596 | int r; |
2a1037af LP |
597 | |
598 | assert(q); | |
599 | assert(state); | |
600 | ||
dd0bc0f1 LP |
601 | /* Tries to synthesize localhost RR replies (and others) where appropriate. Note that this is done *after* the |
602 | * the normal lookup finished. The data from the network hence takes precedence over the data we | |
603 | * synthesize. (But note that many scopes refuse to resolve certain domain names) */ | |
2a1037af LP |
604 | |
605 | if (!IN_SET(*state, | |
3bbdc31d | 606 | DNS_TRANSACTION_RCODE_FAILURE, |
2a1037af LP |
607 | DNS_TRANSACTION_NO_SERVERS, |
608 | DNS_TRANSACTION_TIMEOUT, | |
edbcc1fd | 609 | DNS_TRANSACTION_ATTEMPTS_MAX_REACHED, |
0791110f LP |
610 | DNS_TRANSACTION_NETWORK_DOWN, |
611 | DNS_TRANSACTION_NOT_FOUND)) | |
78c6a153 | 612 | return 0; |
2a1037af | 613 | |
839a4a20 LP |
614 | r = dns_synthesize_answer( |
615 | q->manager, | |
616 | q->question_utf8, | |
617 | q->ifindex, | |
dd0bc0f1 | 618 | &answer); |
2a1037af | 619 | |
839a4a20 LP |
620 | if (r <= 0) |
621 | return r; | |
2a1037af | 622 | |
839a4a20 | 623 | dns_query_reset_answer(q); |
2a1037af | 624 | |
2a1037af LP |
625 | q->answer = answer; |
626 | answer = NULL; | |
2a1037af | 627 | q->answer_rcode = DNS_RCODE_SUCCESS; |
dd0bc0f1 LP |
628 | q->answer_protocol = dns_synthesize_protocol(q->flags); |
629 | q->answer_family = dns_synthesize_family(q->flags); | |
839a4a20 | 630 | q->answer_authenticated = true; |
2a1037af LP |
631 | |
632 | *state = DNS_TRANSACTION_SUCCESS; | |
78c6a153 LP |
633 | |
634 | return 1; | |
2a1037af LP |
635 | } |
636 | ||
dd0bc0f1 LP |
637 | static int dns_query_try_etc_hosts(DnsQuery *q) { |
638 | _cleanup_(dns_answer_unrefp) DnsAnswer *answer = NULL; | |
639 | int r; | |
640 | ||
641 | assert(q); | |
642 | ||
643 | /* Looks in /etc/hosts for matching entries. Note that this is done *before* the normal lookup is done. The | |
644 | * data from /etc/hosts hence takes precedence over the network. */ | |
645 | ||
646 | r = manager_etc_hosts_lookup( | |
647 | q->manager, | |
648 | q->question_utf8, | |
649 | &answer); | |
650 | if (r <= 0) | |
651 | return r; | |
652 | ||
653 | dns_query_reset_answer(q); | |
654 | ||
655 | q->answer = answer; | |
656 | answer = NULL; | |
657 | q->answer_rcode = DNS_RCODE_SUCCESS; | |
658 | q->answer_protocol = dns_synthesize_protocol(q->flags); | |
659 | q->answer_family = dns_synthesize_family(q->flags); | |
660 | q->answer_authenticated = true; | |
661 | ||
662 | return 1; | |
663 | } | |
664 | ||
322345fd | 665 | int dns_query_go(DnsQuery *q) { |
8ba9fd9c LP |
666 | DnsScopeMatch found = DNS_SCOPE_NO; |
667 | DnsScope *s, *first = NULL; | |
801ad6a6 | 668 | DnsQueryCandidate *c; |
8ba9fd9c LP |
669 | int r; |
670 | ||
671 | assert(q); | |
672 | ||
ec2c5e43 | 673 | if (q->state != DNS_TRANSACTION_NULL) |
8ba9fd9c LP |
674 | return 0; |
675 | ||
dd0bc0f1 LP |
676 | r = dns_query_try_etc_hosts(q); |
677 | if (r < 0) | |
678 | return r; | |
679 | if (r > 0) { | |
680 | dns_query_complete(q, DNS_TRANSACTION_SUCCESS); | |
681 | return 1; | |
682 | } | |
683 | ||
8ba9fd9c | 684 | LIST_FOREACH(scopes, s, q->manager->dns_scopes) { |
74b2466e | 685 | DnsScopeMatch match; |
23b298bc LP |
686 | const char *name; |
687 | ||
688 | name = dns_question_first_name(dns_query_question_for_protocol(q, s->protocol)); | |
689 | if (!name) | |
690 | continue; | |
74b2466e | 691 | |
51323288 | 692 | match = dns_scope_good_domain(s, q->ifindex, q->flags, name); |
74b2466e LP |
693 | if (match < 0) |
694 | return match; | |
695 | ||
696 | if (match == DNS_SCOPE_NO) | |
697 | continue; | |
698 | ||
699 | found = match; | |
700 | ||
701 | if (match == DNS_SCOPE_YES) { | |
702 | first = s; | |
703 | break; | |
704 | } else { | |
705 | assert(match == DNS_SCOPE_MAYBE); | |
706 | ||
707 | if (!first) | |
708 | first = s; | |
709 | } | |
710 | } | |
711 | ||
2a1037af LP |
712 | if (found == DNS_SCOPE_NO) { |
713 | DnsTransactionState state = DNS_TRANSACTION_NO_SERVERS; | |
714 | ||
7cc6ed7b LP |
715 | r = dns_query_synthesize_reply(q, &state); |
716 | if (r < 0) | |
717 | return r; | |
718 | ||
d634711b LP |
719 | dns_query_complete(q, state); |
720 | return 1; | |
2a1037af | 721 | } |
74b2466e | 722 | |
801ad6a6 | 723 | r = dns_query_add_candidate(q, first); |
74b2466e | 724 | if (r < 0) |
ec2c5e43 | 725 | goto fail; |
74b2466e | 726 | |
74b2466e LP |
727 | LIST_FOREACH(scopes, s, first->scopes_next) { |
728 | DnsScopeMatch match; | |
23b298bc LP |
729 | const char *name; |
730 | ||
731 | name = dns_question_first_name(dns_query_question_for_protocol(q, s->protocol)); | |
732 | if (!name) | |
733 | continue; | |
74b2466e | 734 | |
51323288 | 735 | match = dns_scope_good_domain(s, q->ifindex, q->flags, name); |
74b2466e | 736 | if (match < 0) |
ec2c5e43 | 737 | goto fail; |
74b2466e LP |
738 | |
739 | if (match != found) | |
740 | continue; | |
741 | ||
801ad6a6 | 742 | r = dns_query_add_candidate(q, s); |
74b2466e | 743 | if (r < 0) |
ec2c5e43 | 744 | goto fail; |
74b2466e LP |
745 | } |
746 | ||
ab88b6d0 | 747 | dns_query_reset_answer(q); |
74b2466e | 748 | |
9a015429 LP |
749 | r = sd_event_add_time( |
750 | q->manager->event, | |
751 | &q->timeout_event_source, | |
752 | clock_boottime_or_monotonic(), | |
753 | now(clock_boottime_or_monotonic()) + QUERY_TIMEOUT_USEC, 0, | |
754 | on_query_timeout, q); | |
74b2466e LP |
755 | if (r < 0) |
756 | goto fail; | |
757 | ||
aa4a9deb LP |
758 | (void) sd_event_source_set_description(q->timeout_event_source, "query-timeout"); |
759 | ||
ec2c5e43 | 760 | q->state = DNS_TRANSACTION_PENDING; |
faa133f3 | 761 | q->block_ready++; |
74b2466e | 762 | |
801ad6a6 LP |
763 | /* Start the transactions */ |
764 | LIST_FOREACH(candidates_by_query, c, q->candidates) { | |
765 | r = dns_query_candidate_go(c); | |
766 | if (r < 0) { | |
767 | q->block_ready--; | |
ec2c5e43 | 768 | goto fail; |
801ad6a6 | 769 | } |
74b2466e LP |
770 | } |
771 | ||
faa133f3 LP |
772 | q->block_ready--; |
773 | dns_query_ready(q); | |
322345fd | 774 | |
8ba9fd9c | 775 | return 1; |
74b2466e LP |
776 | |
777 | fail: | |
8ba9fd9c | 778 | dns_query_stop(q); |
74b2466e LP |
779 | return r; |
780 | } | |
781 | ||
801ad6a6 | 782 | static void dns_query_accept(DnsQuery *q, DnsQueryCandidate *c) { |
ec2c5e43 | 783 | DnsTransactionState state = DNS_TRANSACTION_NO_SERVERS; |
547973de | 784 | bool has_authenticated = false, has_non_authenticated = false; |
019036a4 | 785 | DnssecResult dnssec_result_authenticated = _DNSSEC_RESULT_INVALID, dnssec_result_non_authenticated = _DNSSEC_RESULT_INVALID; |
801ad6a6 | 786 | DnsTransaction *t; |
faa133f3 | 787 | Iterator i; |
547973de | 788 | int r; |
74b2466e LP |
789 | |
790 | assert(q); | |
791 | ||
801ad6a6 | 792 | if (!c) { |
7cc6ed7b LP |
793 | r = dns_query_synthesize_reply(q, &state); |
794 | if (r < 0) | |
795 | goto fail; | |
796 | ||
801ad6a6 | 797 | dns_query_complete(q, state); |
74b2466e | 798 | return; |
801ad6a6 | 799 | } |
74b2466e | 800 | |
a7bf2ada LP |
801 | if (c->error_code != 0) { |
802 | /* If the candidate had an error condition of its own, start with that. */ | |
803 | state = DNS_TRANSACTION_ERRNO; | |
804 | q->answer = dns_answer_unref(q->answer); | |
805 | q->answer_rcode = 0; | |
806 | q->answer_dnssec_result = _DNSSEC_RESULT_INVALID; | |
807 | q->answer_errno = c->error_code; | |
808 | } | |
809 | ||
801ad6a6 | 810 | SET_FOREACH(t, c->transactions, i) { |
74b2466e | 811 | |
801ad6a6 | 812 | switch (t->state) { |
934e9b10 | 813 | |
801ad6a6 | 814 | case DNS_TRANSACTION_SUCCESS: { |
f8e2f4d6 | 815 | /* We found a successfully reply, merge it into the answer */ |
547973de | 816 | r = dns_answer_extend(&q->answer, t->answer); |
7cc6ed7b LP |
817 | if (r < 0) |
818 | goto fail; | |
019036a4 | 819 | |
ae6a4bbf | 820 | q->answer_rcode = t->answer_rcode; |
7cc6ed7b | 821 | q->answer_errno = 0; |
801ad6a6 | 822 | |
019036a4 | 823 | if (t->answer_authenticated) { |
931851e8 | 824 | has_authenticated = true; |
019036a4 LP |
825 | dnssec_result_authenticated = t->answer_dnssec_result; |
826 | } else { | |
931851e8 | 827 | has_non_authenticated = true; |
019036a4 LP |
828 | dnssec_result_non_authenticated = t->answer_dnssec_result; |
829 | } | |
931851e8 | 830 | |
801ad6a6 LP |
831 | state = DNS_TRANSACTION_SUCCESS; |
832 | break; | |
833 | } | |
834 | ||
801ad6a6 | 835 | case DNS_TRANSACTION_NULL: |
547973de LP |
836 | case DNS_TRANSACTION_PENDING: |
837 | case DNS_TRANSACTION_VALIDATING: | |
801ad6a6 LP |
838 | case DNS_TRANSACTION_ABORTED: |
839 | /* Ignore transactions that didn't complete */ | |
840 | continue; | |
841 | ||
842 | default: | |
843 | /* Any kind of failure? Store the data away, | |
844 | * if there's nothing stored yet. */ | |
934e9b10 | 845 | |
019036a4 LP |
846 | if (state == DNS_TRANSACTION_SUCCESS) |
847 | continue; | |
934e9b10 | 848 | |
d38d5ca6 | 849 | q->answer = dns_answer_unref(q->answer); |
019036a4 LP |
850 | q->answer_rcode = t->answer_rcode; |
851 | q->answer_dnssec_result = t->answer_dnssec_result; | |
7cc6ed7b | 852 | q->answer_errno = t->answer_errno; |
934e9b10 | 853 | |
019036a4 | 854 | state = t->state; |
801ad6a6 | 855 | break; |
74b2466e | 856 | } |
801ad6a6 | 857 | } |
74b2466e | 858 | |
019036a4 LP |
859 | if (state == DNS_TRANSACTION_SUCCESS) { |
860 | q->answer_authenticated = has_authenticated && !has_non_authenticated; | |
861 | q->answer_dnssec_result = q->answer_authenticated ? dnssec_result_authenticated : dnssec_result_non_authenticated; | |
862 | } | |
863 | ||
801ad6a6 LP |
864 | q->answer_protocol = c->scope->protocol; |
865 | q->answer_family = c->scope->family; | |
934e9b10 | 866 | |
801ad6a6 LP |
867 | dns_search_domain_unref(q->answer_search_domain); |
868 | q->answer_search_domain = dns_search_domain_ref(c->search_domain); | |
7e8e0422 | 869 | |
7cc6ed7b LP |
870 | r = dns_query_synthesize_reply(q, &state); |
871 | if (r < 0) | |
872 | goto fail; | |
873 | ||
801ad6a6 | 874 | dns_query_complete(q, state); |
7cc6ed7b LP |
875 | return; |
876 | ||
877 | fail: | |
878 | q->answer_errno = -r; | |
879 | dns_query_complete(q, DNS_TRANSACTION_ERRNO); | |
801ad6a6 | 880 | } |
934e9b10 | 881 | |
801ad6a6 | 882 | void dns_query_ready(DnsQuery *q) { |
74b2466e | 883 | |
801ad6a6 LP |
884 | DnsQueryCandidate *bad = NULL, *c; |
885 | bool pending = false; | |
74b2466e | 886 | |
801ad6a6 | 887 | assert(q); |
547973de | 888 | assert(DNS_TRANSACTION_IS_LIVE(q->state)); |
e4501ed4 | 889 | |
801ad6a6 LP |
890 | /* Note that this call might invalidate the query. Callers |
891 | * should hence not attempt to access the query or transaction | |
892 | * after calling this function, unless the block_ready | |
893 | * counter was explicitly bumped before doing so. */ | |
894 | ||
895 | if (q->block_ready > 0) | |
896 | return; | |
897 | ||
898 | LIST_FOREACH(candidates_by_query, c, q->candidates) { | |
899 | DnsTransactionState state; | |
900 | ||
901 | state = dns_query_candidate_state(c); | |
902 | switch (state) { | |
903 | ||
904 | case DNS_TRANSACTION_SUCCESS: | |
547973de | 905 | /* One of the candidates is successful, |
801ad6a6 LP |
906 | * let's use it, and copy its data out */ |
907 | dns_query_accept(q, c); | |
e4501ed4 LP |
908 | return; |
909 | ||
801ad6a6 | 910 | case DNS_TRANSACTION_NULL: |
547973de LP |
911 | case DNS_TRANSACTION_PENDING: |
912 | case DNS_TRANSACTION_VALIDATING: | |
913 | /* One of the candidates is still going on, | |
914 | * let's maybe wait for it */ | |
801ad6a6 LP |
915 | pending = true; |
916 | break; | |
e4501ed4 | 917 | |
801ad6a6 LP |
918 | default: |
919 | /* Any kind of failure */ | |
920 | bad = c; | |
921 | break; | |
922 | } | |
faa133f3 | 923 | } |
74b2466e | 924 | |
801ad6a6 LP |
925 | if (pending) |
926 | return; | |
2a1037af | 927 | |
801ad6a6 | 928 | dns_query_accept(q, bad); |
74b2466e | 929 | } |
8ba9fd9c | 930 | |
45ec7efb | 931 | static int dns_query_cname_redirect(DnsQuery *q, const DnsResourceRecord *cname) { |
23b298bc LP |
932 | _cleanup_(dns_question_unrefp) DnsQuestion *nq_idna = NULL, *nq_utf8 = NULL; |
933 | int r, k; | |
8ba9fd9c LP |
934 | |
935 | assert(q); | |
936 | ||
313cefa1 | 937 | q->n_cname_redirects++; |
faa133f3 | 938 | if (q->n_cname_redirects > CNAME_MAX) |
8ba9fd9c LP |
939 | return -ELOOP; |
940 | ||
23b298bc | 941 | r = dns_question_cname_redirect(q->question_idna, cname, &nq_idna); |
faa133f3 LP |
942 | if (r < 0) |
943 | return r; | |
23b298bc | 944 | else if (r > 0) |
8ec76e6a | 945 | log_debug("Following CNAME/DNAME %s → %s.", dns_question_first_name(q->question_idna), dns_question_first_name(nq_idna)); |
23b298bc LP |
946 | |
947 | k = dns_question_is_equal(q->question_idna, q->question_utf8); | |
948 | if (k < 0) | |
949 | return r; | |
950 | if (k > 0) { | |
951 | /* Same question? Shortcut new question generation */ | |
952 | nq_utf8 = dns_question_ref(nq_idna); | |
953 | k = r; | |
954 | } else { | |
955 | k = dns_question_cname_redirect(q->question_utf8, cname, &nq_utf8); | |
956 | if (k < 0) | |
957 | return k; | |
958 | else if (k > 0) | |
8ec76e6a | 959 | log_debug("Following UTF8 CNAME/DNAME %s → %s.", dns_question_first_name(q->question_utf8), dns_question_first_name(nq_utf8)); |
23b298bc | 960 | } |
8ba9fd9c | 961 | |
23b298bc LP |
962 | if (r == 0 && k == 0) /* No actual cname happened? */ |
963 | return -ELOOP; | |
964 | ||
8e5de09f LP |
965 | if (q->answer_protocol == DNS_PROTOCOL_DNS) { |
966 | /* Don't permit CNAME redirects from unicast DNS to LLMNR or MulticastDNS, so that global resources | |
967 | * cannot invade the local namespace. The opposite way we permit: local names may redirect to global | |
968 | * ones. */ | |
969 | ||
970 | q->flags &= ~(SD_RESOLVED_LLMNR|SD_RESOLVED_MDNS); /* mask away the local protocols */ | |
971 | } | |
972 | ||
973 | /* Turn off searching for the new name */ | |
974 | q->flags |= SD_RESOLVED_NO_SEARCH; | |
975 | ||
23b298bc LP |
976 | dns_question_unref(q->question_idna); |
977 | q->question_idna = nq_idna; | |
978 | nq_idna = NULL; | |
bc7669cf | 979 | |
23b298bc LP |
980 | dns_question_unref(q->question_utf8); |
981 | q->question_utf8 = nq_utf8; | |
982 | nq_utf8 = NULL; | |
8ba9fd9c | 983 | |
7820b320 LP |
984 | dns_query_free_candidates(q); |
985 | dns_query_reset_answer(q); | |
322345fd | 986 | |
8e5de09f | 987 | q->state = DNS_TRANSACTION_NULL; |
59a89990 | 988 | |
8ba9fd9c LP |
989 | return 0; |
990 | } | |
82bd6ddd | 991 | |
45ec7efb LP |
992 | int dns_query_process_cname(DnsQuery *q) { |
993 | _cleanup_(dns_resource_record_unrefp) DnsResourceRecord *cname = NULL; | |
23b298bc | 994 | DnsQuestion *question; |
45ec7efb LP |
995 | DnsResourceRecord *rr; |
996 | int r; | |
997 | ||
998 | assert(q); | |
999 | ||
7588460a TG |
1000 | if (!IN_SET(q->state, DNS_TRANSACTION_SUCCESS, DNS_TRANSACTION_NULL)) |
1001 | return DNS_QUERY_NOMATCH; | |
45ec7efb | 1002 | |
23b298bc | 1003 | question = dns_query_question_for_protocol(q, q->answer_protocol); |
45ec7efb | 1004 | |
23b298bc LP |
1005 | DNS_ANSWER_FOREACH(rr, q->answer) { |
1006 | r = dns_question_matches_rr(question, rr, DNS_SEARCH_DOMAIN_NAME(q->answer_search_domain)); | |
45ec7efb LP |
1007 | if (r < 0) |
1008 | return r; | |
1009 | if (r > 0) | |
7588460a | 1010 | return DNS_QUERY_MATCH; /* The answer matches directly, no need to follow cnames */ |
45ec7efb | 1011 | |
542e0c84 | 1012 | r = dns_question_matches_cname_or_dname(question, rr, DNS_SEARCH_DOMAIN_NAME(q->answer_search_domain)); |
45ec7efb LP |
1013 | if (r < 0) |
1014 | return r; | |
1015 | if (r > 0 && !cname) | |
1016 | cname = dns_resource_record_ref(rr); | |
1017 | } | |
1018 | ||
1019 | if (!cname) | |
7588460a | 1020 | return DNS_QUERY_NOMATCH; /* No match and no cname to follow */ |
45ec7efb LP |
1021 | |
1022 | if (q->flags & SD_RESOLVED_NO_CNAME) | |
1023 | return -ELOOP; | |
1024 | ||
1025 | /* OK, let's actually follow the CNAME */ | |
1026 | r = dns_query_cname_redirect(q, cname); | |
1027 | if (r < 0) | |
1028 | return r; | |
1029 | ||
1030 | /* Let's see if the answer can already answer the new | |
1031 | * redirected question */ | |
7588460a TG |
1032 | r = dns_query_process_cname(q); |
1033 | if (r != DNS_QUERY_NOMATCH) | |
1034 | return r; | |
45ec7efb LP |
1035 | |
1036 | /* OK, it cannot, let's begin with the new query */ | |
1037 | r = dns_query_go(q); | |
1038 | if (r < 0) | |
1039 | return r; | |
1040 | ||
7588460a | 1041 | return DNS_QUERY_RESTARTED; /* We restarted the query for a new cname */ |
45ec7efb LP |
1042 | } |
1043 | ||
82bd6ddd LP |
1044 | static int on_bus_track(sd_bus_track *t, void *userdata) { |
1045 | DnsQuery *q = userdata; | |
1046 | ||
1047 | assert(t); | |
1048 | assert(q); | |
1049 | ||
1050 | log_debug("Client of active query vanished, aborting query."); | |
1051 | dns_query_complete(q, DNS_TRANSACTION_ABORTED); | |
1052 | return 0; | |
1053 | } | |
1054 | ||
966c66e3 | 1055 | int dns_query_bus_track(DnsQuery *q, sd_bus_message *m) { |
82bd6ddd LP |
1056 | int r; |
1057 | ||
1058 | assert(q); | |
1059 | assert(m); | |
1060 | ||
1061 | if (!q->bus_track) { | |
966c66e3 | 1062 | r = sd_bus_track_new(sd_bus_message_get_bus(m), &q->bus_track, on_bus_track, q); |
82bd6ddd LP |
1063 | if (r < 0) |
1064 | return r; | |
1065 | } | |
1066 | ||
1067 | r = sd_bus_track_add_sender(q->bus_track, m); | |
1068 | if (r < 0) | |
1069 | return r; | |
1070 | ||
1071 | return 0; | |
1072 | } | |
23b298bc LP |
1073 | |
1074 | DnsQuestion* dns_query_question_for_protocol(DnsQuery *q, DnsProtocol protocol) { | |
1075 | assert(q); | |
1076 | ||
1077 | switch (protocol) { | |
1078 | ||
1079 | case DNS_PROTOCOL_DNS: | |
1080 | return q->question_idna; | |
1081 | ||
1082 | case DNS_PROTOCOL_MDNS: | |
1083 | case DNS_PROTOCOL_LLMNR: | |
1084 | return q->question_utf8; | |
1085 | ||
1086 | default: | |
1087 | return NULL; | |
1088 | } | |
1089 | } | |
1090 | ||
1091 | const char *dns_query_string(DnsQuery *q) { | |
1092 | const char *name; | |
1093 | int r; | |
1094 | ||
1095 | /* Returns a somewhat useful human-readable lookup key string for this query */ | |
1096 | ||
1097 | if (q->request_address_string) | |
1098 | return q->request_address_string; | |
1099 | ||
1100 | if (q->request_address_valid) { | |
1101 | r = in_addr_to_string(q->request_family, &q->request_address, &q->request_address_string); | |
1102 | if (r >= 0) | |
1103 | return q->request_address_string; | |
1104 | } | |
1105 | ||
1106 | name = dns_question_first_name(q->question_utf8); | |
1107 | if (name) | |
1108 | return name; | |
1109 | ||
1110 | return dns_question_first_name(q->question_idna); | |
1111 | } |