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