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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
74b2466e LP |
2 | /*** |
3 | This file is part of systemd. | |
4 | ||
5 | Copyright 2014 Lennart Poettering | |
6 | ||
7 | systemd is free software; you can redistribute it and/or modify it | |
8 | under the terms of the GNU Lesser General Public License as published by | |
9 | the Free Software Foundation; either version 2.1 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | systemd is distributed in the hope that it will be useful, but | |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | Lesser General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU Lesser General Public License | |
18 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
19 | ***/ | |
20 | ||
b5efdb8a | 21 | #include "alloc-util.h" |
2a1037af | 22 | #include "dns-domain.h" |
011696f7 | 23 | #include "dns-type.h" |
b5efdb8a | 24 | #include "hostname-util.h" |
78c6a153 | 25 | #include "local-addresses.h" |
74b2466e | 26 | #include "resolved-dns-query.h" |
839a4a20 | 27 | #include "resolved-dns-synthesize.h" |
dd0bc0f1 | 28 | #include "resolved-etc-hosts.h" |
23b298bc | 29 | #include "string-util.h" |
74b2466e | 30 | |
8ba9fd9c | 31 | #define CNAME_MAX 8 |
39762fdf | 32 | #define QUERIES_MAX 2048 |
45ec7efb | 33 | #define AUXILIARY_QUERIES_MAX 64 |
8ba9fd9c | 34 | |
801ad6a6 LP |
35 | static int dns_query_candidate_new(DnsQueryCandidate **ret, DnsQuery *q, DnsScope *s) { |
36 | DnsQueryCandidate *c; | |
74b2466e | 37 | |
801ad6a6 | 38 | assert(ret); |
faa133f3 | 39 | assert(q); |
801ad6a6 | 40 | assert(s); |
74b2466e | 41 | |
801ad6a6 LP |
42 | c = new0(DnsQueryCandidate, 1); |
43 | if (!c) | |
44 | return -ENOMEM; | |
45 | ||
46 | c->query = q; | |
47 | c->scope = s; | |
48 | ||
49 | LIST_PREPEND(candidates_by_query, q->candidates, c); | |
50 | LIST_PREPEND(candidates_by_scope, s->query_candidates, c); | |
51 | ||
52 | *ret = c; | |
53 | return 0; | |
54 | } | |
55 | ||
56 | static void dns_query_candidate_stop(DnsQueryCandidate *c) { | |
57 | DnsTransaction *t; | |
74b2466e | 58 | |
801ad6a6 LP |
59 | assert(c); |
60 | ||
61 | while ((t = set_steal_first(c->transactions))) { | |
547973de | 62 | set_remove(t->notify_query_candidates, c); |
35aa04e9 | 63 | set_remove(t->notify_query_candidates_done, c); |
ec2c5e43 | 64 | dns_transaction_gc(t); |
74b2466e | 65 | } |
74b2466e LP |
66 | } |
67 | ||
801ad6a6 LP |
68 | DnsQueryCandidate* dns_query_candidate_free(DnsQueryCandidate *c) { |
69 | ||
70 | if (!c) | |
71 | return NULL; | |
72 | ||
73 | dns_query_candidate_stop(c); | |
74 | ||
75 | set_free(c->transactions); | |
76 | dns_search_domain_unref(c->search_domain); | |
77 | ||
78 | if (c->query) | |
79 | LIST_REMOVE(candidates_by_query, c->query->candidates, c); | |
80 | ||
81 | if (c->scope) | |
82 | LIST_REMOVE(candidates_by_scope, c->scope->query_candidates, c); | |
83 | ||
6b430fdb | 84 | return mfree(c); |
801ad6a6 LP |
85 | } |
86 | ||
87 | static int dns_query_candidate_next_search_domain(DnsQueryCandidate *c) { | |
801ad6a6 LP |
88 | DnsSearchDomain *next = NULL; |
89 | ||
90 | assert(c); | |
91 | ||
ad44b56b | 92 | if (c->search_domain && c->search_domain->linked) |
801ad6a6 | 93 | next = c->search_domain->domains_next; |
ad44b56b LP |
94 | else |
95 | next = dns_scope_get_search_domains(c->scope); | |
801ad6a6 | 96 | |
ad44b56b | 97 | for (;;) { |
6627b7e2 LP |
98 | if (!next) /* We hit the end of the list */ |
99 | return 0; | |
801ad6a6 | 100 | |
ad44b56b LP |
101 | if (!next->route_only) |
102 | break; | |
801ad6a6 | 103 | |
ad44b56b LP |
104 | /* Skip over route-only domains */ |
105 | next = next->domains_next; | |
801ad6a6 LP |
106 | } |
107 | ||
108 | dns_search_domain_unref(c->search_domain); | |
109 | c->search_domain = dns_search_domain_ref(next); | |
6627b7e2 | 110 | |
801ad6a6 LP |
111 | return 1; |
112 | } | |
113 | ||
114 | static int dns_query_candidate_add_transaction(DnsQueryCandidate *c, DnsResourceKey *key) { | |
115 | DnsTransaction *t; | |
116 | int r; | |
117 | ||
118 | assert(c); | |
119 | assert(key); | |
120 | ||
801ad6a6 LP |
121 | t = dns_scope_find_transaction(c->scope, key, true); |
122 | if (!t) { | |
123 | r = dns_transaction_new(&t, c->scope, key); | |
124 | if (r < 0) | |
125 | return r; | |
547973de LP |
126 | } else { |
127 | if (set_contains(c->transactions, t)) | |
128 | return 0; | |
801ad6a6 LP |
129 | } |
130 | ||
547973de LP |
131 | r = set_ensure_allocated(&c->transactions, NULL); |
132 | if (r < 0) | |
133 | goto gc; | |
134 | ||
135 | r = set_ensure_allocated(&t->notify_query_candidates, NULL); | |
801ad6a6 LP |
136 | if (r < 0) |
137 | goto gc; | |
138 | ||
35aa04e9 LP |
139 | r = set_ensure_allocated(&t->notify_query_candidates_done, NULL); |
140 | if (r < 0) | |
141 | goto gc; | |
142 | ||
547973de | 143 | r = set_put(t->notify_query_candidates, c); |
801ad6a6 LP |
144 | if (r < 0) |
145 | goto gc; | |
146 | ||
147 | r = set_put(c->transactions, t); | |
148 | if (r < 0) { | |
547973de | 149 | (void) set_remove(t->notify_query_candidates, c); |
801ad6a6 LP |
150 | goto gc; |
151 | } | |
152 | ||
17c8de63 | 153 | t->clamp_ttl = c->query->clamp_ttl; |
547973de | 154 | return 1; |
801ad6a6 LP |
155 | |
156 | gc: | |
157 | dns_transaction_gc(t); | |
158 | return r; | |
159 | } | |
160 | ||
161 | static int dns_query_candidate_go(DnsQueryCandidate *c) { | |
162 | DnsTransaction *t; | |
163 | Iterator i; | |
164 | int r; | |
011696f7 | 165 | unsigned n = 0; |
801ad6a6 LP |
166 | |
167 | assert(c); | |
168 | ||
169 | /* Start the transactions that are not started yet */ | |
170 | SET_FOREACH(t, c->transactions, i) { | |
171 | if (t->state != DNS_TRANSACTION_NULL) | |
172 | continue; | |
173 | ||
174 | r = dns_transaction_go(t); | |
175 | if (r < 0) | |
176 | return r; | |
011696f7 LP |
177 | |
178 | n++; | |
801ad6a6 LP |
179 | } |
180 | ||
011696f7 LP |
181 | /* If there was nothing to start, then let's proceed immediately */ |
182 | if (n == 0) | |
183 | dns_query_candidate_notify(c); | |
184 | ||
801ad6a6 LP |
185 | return 0; |
186 | } | |
187 | ||
188 | static DnsTransactionState dns_query_candidate_state(DnsQueryCandidate *c) { | |
189 | DnsTransactionState state = DNS_TRANSACTION_NO_SERVERS; | |
190 | DnsTransaction *t; | |
191 | Iterator i; | |
192 | ||
193 | assert(c); | |
194 | ||
195 | if (c->error_code != 0) | |
7cc6ed7b | 196 | return DNS_TRANSACTION_ERRNO; |
801ad6a6 LP |
197 | |
198 | SET_FOREACH(t, c->transactions, i) { | |
199 | ||
200 | switch (t->state) { | |
201 | ||
5264131a LP |
202 | case DNS_TRANSACTION_NULL: |
203 | /* If there's a NULL transaction pending, then | |
204 | * this means not all transactions where | |
205 | * started yet, and we were called from within | |
206 | * the stackframe that is supposed to start | |
207 | * remaining transactions. In this case, | |
208 | * simply claim the candidate is pending. */ | |
209 | ||
801ad6a6 | 210 | case DNS_TRANSACTION_PENDING: |
547973de LP |
211 | case DNS_TRANSACTION_VALIDATING: |
212 | /* If there's one transaction currently in | |
213 | * VALIDATING state, then this means there's | |
214 | * also one in PENDING state, hence we can | |
215 | * return PENDING immediately. */ | |
216 | return DNS_TRANSACTION_PENDING; | |
801ad6a6 LP |
217 | |
218 | case DNS_TRANSACTION_SUCCESS: | |
219 | state = t->state; | |
220 | break; | |
221 | ||
222 | default: | |
223 | if (state != DNS_TRANSACTION_SUCCESS) | |
224 | state = t->state; | |
225 | ||
226 | break; | |
227 | } | |
228 | } | |
229 | ||
230 | return state; | |
231 | } | |
232 | ||
011696f7 LP |
233 | static bool dns_query_candidate_is_routable(DnsQueryCandidate *c, uint16_t type) { |
234 | int family; | |
235 | ||
236 | assert(c); | |
237 | ||
238 | /* Checks whether the specified RR type matches an address family that is routable on the link(s) the scope of | |
239 | * this candidate belongs to. Specifically, whether there's a routable IPv4 address on it if we query an A RR, | |
240 | * or a routable IPv6 address if we query an AAAA RR. */ | |
241 | ||
242 | if (!c->query->suppress_unroutable_family) | |
243 | return true; | |
244 | ||
245 | if (c->scope->protocol != DNS_PROTOCOL_DNS) | |
246 | return true; | |
247 | ||
248 | family = dns_type_to_af(type); | |
249 | if (family < 0) | |
250 | return true; | |
251 | ||
252 | if (c->scope->link) | |
253 | return link_relevant(c->scope->link, family, false); | |
254 | else | |
255 | return manager_routable(c->scope->manager, family); | |
256 | } | |
257 | ||
801ad6a6 | 258 | static int dns_query_candidate_setup_transactions(DnsQueryCandidate *c) { |
23b298bc | 259 | DnsQuestion *question; |
801ad6a6 LP |
260 | DnsResourceKey *key; |
261 | int n = 0, r; | |
262 | ||
263 | assert(c); | |
264 | ||
265 | dns_query_candidate_stop(c); | |
266 | ||
23b298bc LP |
267 | question = dns_query_question_for_protocol(c->query, c->scope->protocol); |
268 | ||
801ad6a6 | 269 | /* Create one transaction per question key */ |
23b298bc | 270 | DNS_QUESTION_FOREACH(key, question) { |
801ad6a6 | 271 | _cleanup_(dns_resource_key_unrefp) DnsResourceKey *new_key = NULL; |
011696f7 LP |
272 | DnsResourceKey *qkey; |
273 | ||
274 | if (!dns_query_candidate_is_routable(c, key->type)) | |
275 | continue; | |
801ad6a6 LP |
276 | |
277 | if (c->search_domain) { | |
278 | r = dns_resource_key_new_append_suffix(&new_key, key, c->search_domain->name); | |
279 | if (r < 0) | |
280 | goto fail; | |
801ad6a6 | 281 | |
011696f7 LP |
282 | qkey = new_key; |
283 | } else | |
284 | qkey = key; | |
285 | ||
286 | if (!dns_scope_good_key(c->scope, qkey)) | |
287 | continue; | |
288 | ||
289 | r = dns_query_candidate_add_transaction(c, qkey); | |
801ad6a6 LP |
290 | if (r < 0) |
291 | goto fail; | |
292 | ||
293 | n++; | |
294 | } | |
295 | ||
296 | return n; | |
297 | ||
298 | fail: | |
299 | dns_query_candidate_stop(c); | |
300 | return r; | |
301 | } | |
302 | ||
547973de | 303 | void dns_query_candidate_notify(DnsQueryCandidate *c) { |
801ad6a6 LP |
304 | DnsTransactionState state; |
305 | int r; | |
306 | ||
307 | assert(c); | |
308 | ||
309 | state = dns_query_candidate_state(c); | |
310 | ||
547973de | 311 | if (DNS_TRANSACTION_IS_LIVE(state)) |
801ad6a6 LP |
312 | return; |
313 | ||
314 | if (state != DNS_TRANSACTION_SUCCESS && c->search_domain) { | |
315 | ||
316 | r = dns_query_candidate_next_search_domain(c); | |
317 | if (r < 0) | |
318 | goto fail; | |
319 | ||
320 | if (r > 0) { | |
321 | /* OK, there's another search domain to try, let's do so. */ | |
322 | ||
323 | r = dns_query_candidate_setup_transactions(c); | |
324 | if (r < 0) | |
325 | goto fail; | |
326 | ||
327 | if (r > 0) { | |
328 | /* New transactions where queued. Start them and wait */ | |
329 | ||
330 | r = dns_query_candidate_go(c); | |
331 | if (r < 0) | |
332 | goto fail; | |
333 | ||
334 | return; | |
335 | } | |
336 | } | |
337 | ||
338 | } | |
339 | ||
340 | dns_query_ready(c->query); | |
341 | return; | |
342 | ||
343 | fail: | |
344 | log_warning_errno(r, "Failed to follow search domains: %m"); | |
345 | c->error_code = r; | |
346 | dns_query_ready(c->query); | |
347 | } | |
348 | ||
349 | static void dns_query_stop(DnsQuery *q) { | |
350 | DnsQueryCandidate *c; | |
351 | ||
352 | assert(q); | |
353 | ||
354 | q->timeout_event_source = sd_event_source_unref(q->timeout_event_source); | |
355 | ||
356 | LIST_FOREACH(candidates_by_query, c, q->candidates) | |
357 | dns_query_candidate_stop(c); | |
358 | } | |
359 | ||
7820b320 LP |
360 | static void dns_query_free_candidates(DnsQuery *q) { |
361 | assert(q); | |
362 | ||
363 | while (q->candidates) | |
364 | dns_query_candidate_free(q->candidates); | |
365 | } | |
366 | ||
367 | static void dns_query_reset_answer(DnsQuery *q) { | |
368 | assert(q); | |
369 | ||
370 | q->answer = dns_answer_unref(q->answer); | |
371 | q->answer_rcode = 0; | |
372 | q->answer_dnssec_result = _DNSSEC_RESULT_INVALID; | |
7cc6ed7b | 373 | q->answer_errno = 0; |
7820b320 LP |
374 | q->answer_authenticated = false; |
375 | q->answer_protocol = _DNS_PROTOCOL_INVALID; | |
376 | q->answer_family = AF_UNSPEC; | |
377 | q->answer_search_domain = dns_search_domain_unref(q->answer_search_domain); | |
378 | } | |
379 | ||
74b2466e | 380 | DnsQuery *dns_query_free(DnsQuery *q) { |
74b2466e LP |
381 | if (!q) |
382 | return NULL; | |
383 | ||
45ec7efb LP |
384 | while (q->auxiliary_queries) |
385 | dns_query_free(q->auxiliary_queries); | |
386 | ||
387 | if (q->auxiliary_for) { | |
388 | assert(q->auxiliary_for->n_auxiliary_queries > 0); | |
389 | q->auxiliary_for->n_auxiliary_queries--; | |
390 | LIST_REMOVE(auxiliary_queries, q->auxiliary_for->auxiliary_queries, q); | |
391 | } | |
392 | ||
7820b320 | 393 | dns_query_free_candidates(q); |
322345fd | 394 | |
23b298bc LP |
395 | dns_question_unref(q->question_idna); |
396 | dns_question_unref(q->question_utf8); | |
7820b320 LP |
397 | |
398 | dns_query_reset_answer(q); | |
322345fd | 399 | |
ec2c5e43 | 400 | sd_bus_message_unref(q->request); |
82bd6ddd | 401 | sd_bus_track_unref(q->bus_track); |
74b2466e | 402 | |
b30bf55d | 403 | dns_packet_unref(q->request_dns_packet); |
e8d23f92 | 404 | dns_packet_unref(q->reply_dns_packet); |
b30bf55d LP |
405 | |
406 | if (q->request_dns_stream) { | |
407 | /* Detach the stream from our query, in case something else keeps a reference to it. */ | |
408 | q->request_dns_stream->complete = NULL; | |
409 | q->request_dns_stream->on_packet = NULL; | |
410 | q->request_dns_stream->query = NULL; | |
411 | dns_stream_unref(q->request_dns_stream); | |
412 | } | |
413 | ||
23b298bc LP |
414 | free(q->request_address_string); |
415 | ||
39762fdf | 416 | if (q->manager) { |
74b2466e | 417 | LIST_REMOVE(queries, q->manager->dns_queries, q); |
39762fdf LP |
418 | q->manager->n_dns_queries--; |
419 | } | |
74b2466e | 420 | |
6b430fdb | 421 | return mfree(q); |
74b2466e LP |
422 | } |
423 | ||
23b298bc LP |
424 | int dns_query_new( |
425 | Manager *m, | |
426 | DnsQuery **ret, | |
427 | DnsQuestion *question_utf8, | |
428 | DnsQuestion *question_idna, | |
17c8de63 LP |
429 | int ifindex, |
430 | uint64_t flags) { | |
23b298bc | 431 | |
74b2466e | 432 | _cleanup_(dns_query_freep) DnsQuery *q = NULL; |
23b298bc LP |
433 | DnsResourceKey *key; |
434 | bool good = false; | |
faa133f3 | 435 | int r; |
202b76ae | 436 | char key_str[DNS_RESOURCE_KEY_STRING_MAX]; |
74b2466e LP |
437 | |
438 | assert(m); | |
439 | ||
23b298bc LP |
440 | if (dns_question_size(question_utf8) > 0) { |
441 | r = dns_question_is_valid_for_query(question_utf8); | |
442 | if (r < 0) | |
443 | return r; | |
444 | if (r == 0) | |
445 | return -EINVAL; | |
446 | ||
447 | good = true; | |
448 | } | |
449 | ||
450 | /* If the IDNA and UTF8 questions are the same, merge their references */ | |
451 | r = dns_question_is_equal(question_idna, question_utf8); | |
faa133f3 LP |
452 | if (r < 0) |
453 | return r; | |
23b298bc LP |
454 | if (r > 0) |
455 | question_idna = question_utf8; | |
456 | else { | |
457 | if (dns_question_size(question_idna) > 0) { | |
458 | r = dns_question_is_valid_for_query(question_idna); | |
459 | if (r < 0) | |
460 | return r; | |
461 | if (r == 0) | |
462 | return -EINVAL; | |
463 | ||
464 | good = true; | |
465 | } | |
466 | } | |
467 | ||
468 | if (!good) /* don't allow empty queries */ | |
469 | return -EINVAL; | |
74b2466e | 470 | |
39762fdf LP |
471 | if (m->n_dns_queries >= QUERIES_MAX) |
472 | return -EBUSY; | |
473 | ||
74b2466e LP |
474 | q = new0(DnsQuery, 1); |
475 | if (!q) | |
476 | return -ENOMEM; | |
477 | ||
23b298bc LP |
478 | q->question_utf8 = dns_question_ref(question_utf8); |
479 | q->question_idna = dns_question_ref(question_idna); | |
51323288 LP |
480 | q->ifindex = ifindex; |
481 | q->flags = flags; | |
7820b320 | 482 | q->answer_dnssec_result = _DNSSEC_RESULT_INVALID; |
801ad6a6 | 483 | q->answer_protocol = _DNS_PROTOCOL_INVALID; |
7820b320 | 484 | q->answer_family = AF_UNSPEC; |
322345fd | 485 | |
23b298bc | 486 | /* First dump UTF8 question */ |
202b76ae ZJS |
487 | DNS_QUESTION_FOREACH(key, question_utf8) |
488 | log_debug("Looking up RR for %s.", | |
489 | dns_resource_key_to_string(key, key_str, sizeof key_str)); | |
23b298bc LP |
490 | |
491 | /* And then dump the IDNA question, but only what hasn't been dumped already through the UTF8 question. */ | |
492 | DNS_QUESTION_FOREACH(key, question_idna) { | |
23b298bc LP |
493 | r = dns_question_contains(question_utf8, key); |
494 | if (r < 0) | |
495 | return r; | |
496 | if (r > 0) | |
497 | continue; | |
498 | ||
202b76ae ZJS |
499 | log_debug("Looking up IDNA RR for %s.", |
500 | dns_resource_key_to_string(key, key_str, sizeof key_str)); | |
74b2466e LP |
501 | } |
502 | ||
503 | LIST_PREPEND(queries, m->dns_queries, q); | |
39762fdf | 504 | m->n_dns_queries++; |
74b2466e LP |
505 | q->manager = m; |
506 | ||
8ba9fd9c LP |
507 | if (ret) |
508 | *ret = q; | |
509 | q = NULL; | |
510 | ||
511 | return 0; | |
512 | } | |
513 | ||
45ec7efb LP |
514 | int dns_query_make_auxiliary(DnsQuery *q, DnsQuery *auxiliary_for) { |
515 | assert(q); | |
516 | assert(auxiliary_for); | |
517 | ||
61233823 | 518 | /* Ensure that the query is not auxiliary yet, and |
45ec7efb LP |
519 | * nothing else is auxiliary to it either */ |
520 | assert(!q->auxiliary_for); | |
521 | assert(!q->auxiliary_queries); | |
522 | ||
523 | /* Ensure that the unit we shall be made auxiliary for isn't | |
524 | * auxiliary itself */ | |
525 | assert(!auxiliary_for->auxiliary_for); | |
526 | ||
527 | if (auxiliary_for->n_auxiliary_queries >= AUXILIARY_QUERIES_MAX) | |
528 | return -EAGAIN; | |
529 | ||
530 | LIST_PREPEND(auxiliary_queries, auxiliary_for->auxiliary_queries, q); | |
531 | q->auxiliary_for = auxiliary_for; | |
532 | ||
533 | auxiliary_for->n_auxiliary_queries++; | |
534 | return 0; | |
535 | } | |
536 | ||
ec2c5e43 | 537 | static void dns_query_complete(DnsQuery *q, DnsTransactionState state) { |
8ba9fd9c | 538 | assert(q); |
547973de LP |
539 | assert(!DNS_TRANSACTION_IS_LIVE(state)); |
540 | assert(DNS_TRANSACTION_IS_LIVE(q->state)); | |
8ba9fd9c | 541 | |
322345fd LP |
542 | /* Note that this call might invalidate the query. Callers |
543 | * should hence not attempt to access the query or transaction | |
544 | * after calling this function. */ | |
8ba9fd9c | 545 | |
8ba9fd9c LP |
546 | q->state = state; |
547 | ||
322345fd LP |
548 | dns_query_stop(q); |
549 | if (q->complete) | |
550 | q->complete(q); | |
8ba9fd9c LP |
551 | } |
552 | ||
553 | static int on_query_timeout(sd_event_source *s, usec_t usec, void *userdata) { | |
554 | DnsQuery *q = userdata; | |
555 | ||
556 | assert(s); | |
557 | assert(q); | |
558 | ||
ec2c5e43 | 559 | dns_query_complete(q, DNS_TRANSACTION_TIMEOUT); |
8ba9fd9c LP |
560 | return 0; |
561 | } | |
562 | ||
801ad6a6 LP |
563 | static int dns_query_add_candidate(DnsQuery *q, DnsScope *s) { |
564 | DnsQueryCandidate *c; | |
faa133f3 LP |
565 | int r; |
566 | ||
567 | assert(q); | |
ec2c5e43 | 568 | assert(s); |
faa133f3 | 569 | |
801ad6a6 | 570 | r = dns_query_candidate_new(&c, q, s); |
faa133f3 LP |
571 | if (r < 0) |
572 | return r; | |
573 | ||
801ad6a6 | 574 | /* If this a single-label domain on DNS, we might append a suitable search domain first. */ |
22f711bb | 575 | if ((q->flags & SD_RESOLVED_NO_SEARCH) == 0) { |
23b298bc | 576 | r = dns_scope_name_needs_search_domain(s, dns_question_first_name(q->question_idna)); |
22f711bb | 577 | if (r < 0) |
801ad6a6 | 578 | goto fail; |
22f711bb LP |
579 | if (r > 0) { |
580 | /* OK, we need a search domain now. Let's find one for this scope */ | |
581 | ||
582 | r = dns_query_candidate_next_search_domain(c); | |
583 | if (r <= 0) /* if there's no search domain, then we won't add any transaction. */ | |
584 | goto fail; | |
585 | } | |
faa133f3 LP |
586 | } |
587 | ||
801ad6a6 LP |
588 | r = dns_query_candidate_setup_transactions(c); |
589 | if (r < 0) | |
590 | goto fail; | |
591 | ||
faa133f3 LP |
592 | return 0; |
593 | ||
801ad6a6 LP |
594 | fail: |
595 | dns_query_candidate_free(c); | |
faa133f3 LP |
596 | return r; |
597 | } | |
598 | ||
78c6a153 | 599 | static int dns_query_synthesize_reply(DnsQuery *q, DnsTransactionState *state) { |
2a1037af | 600 | _cleanup_(dns_answer_unrefp) DnsAnswer *answer = NULL; |
dd0bc0f1 | 601 | int r; |
2a1037af LP |
602 | |
603 | assert(q); | |
604 | assert(state); | |
605 | ||
dd0bc0f1 LP |
606 | /* Tries to synthesize localhost RR replies (and others) where appropriate. Note that this is done *after* the |
607 | * the normal lookup finished. The data from the network hence takes precedence over the data we | |
608 | * synthesize. (But note that many scopes refuse to resolve certain domain names) */ | |
2a1037af LP |
609 | |
610 | if (!IN_SET(*state, | |
3bbdc31d | 611 | DNS_TRANSACTION_RCODE_FAILURE, |
2a1037af LP |
612 | DNS_TRANSACTION_NO_SERVERS, |
613 | DNS_TRANSACTION_TIMEOUT, | |
edbcc1fd | 614 | DNS_TRANSACTION_ATTEMPTS_MAX_REACHED, |
0791110f LP |
615 | DNS_TRANSACTION_NETWORK_DOWN, |
616 | DNS_TRANSACTION_NOT_FOUND)) | |
78c6a153 | 617 | return 0; |
2a1037af | 618 | |
839a4a20 LP |
619 | r = dns_synthesize_answer( |
620 | q->manager, | |
621 | q->question_utf8, | |
622 | q->ifindex, | |
dd0bc0f1 | 623 | &answer); |
acf06088 LP |
624 | if (r == -ENXIO) { |
625 | /* If we get ENXIO this tells us to generate NXDOMAIN unconditionally. */ | |
2a1037af | 626 | |
acf06088 LP |
627 | dns_query_reset_answer(q); |
628 | q->answer_rcode = DNS_RCODE_NXDOMAIN; | |
629 | q->answer_protocol = dns_synthesize_protocol(q->flags); | |
630 | q->answer_family = dns_synthesize_family(q->flags); | |
631 | q->answer_authenticated = true; | |
632 | *state = DNS_TRANSACTION_RCODE_FAILURE; | |
633 | ||
634 | return 0; | |
635 | } | |
839a4a20 LP |
636 | if (r <= 0) |
637 | return r; | |
2a1037af | 638 | |
839a4a20 | 639 | dns_query_reset_answer(q); |
2a1037af | 640 | |
2a1037af LP |
641 | q->answer = answer; |
642 | answer = NULL; | |
2a1037af | 643 | q->answer_rcode = DNS_RCODE_SUCCESS; |
dd0bc0f1 LP |
644 | q->answer_protocol = dns_synthesize_protocol(q->flags); |
645 | q->answer_family = dns_synthesize_family(q->flags); | |
839a4a20 | 646 | q->answer_authenticated = true; |
2a1037af LP |
647 | |
648 | *state = DNS_TRANSACTION_SUCCESS; | |
78c6a153 LP |
649 | |
650 | return 1; | |
2a1037af LP |
651 | } |
652 | ||
dd0bc0f1 LP |
653 | static int dns_query_try_etc_hosts(DnsQuery *q) { |
654 | _cleanup_(dns_answer_unrefp) DnsAnswer *answer = NULL; | |
655 | int r; | |
656 | ||
657 | assert(q); | |
658 | ||
659 | /* Looks in /etc/hosts for matching entries. Note that this is done *before* the normal lookup is done. The | |
660 | * data from /etc/hosts hence takes precedence over the network. */ | |
661 | ||
662 | r = manager_etc_hosts_lookup( | |
663 | q->manager, | |
664 | q->question_utf8, | |
665 | &answer); | |
666 | if (r <= 0) | |
667 | return r; | |
668 | ||
669 | dns_query_reset_answer(q); | |
670 | ||
671 | q->answer = answer; | |
672 | answer = NULL; | |
673 | q->answer_rcode = DNS_RCODE_SUCCESS; | |
674 | q->answer_protocol = dns_synthesize_protocol(q->flags); | |
675 | q->answer_family = dns_synthesize_family(q->flags); | |
676 | q->answer_authenticated = true; | |
677 | ||
678 | return 1; | |
679 | } | |
680 | ||
322345fd | 681 | int dns_query_go(DnsQuery *q) { |
8ba9fd9c LP |
682 | DnsScopeMatch found = DNS_SCOPE_NO; |
683 | DnsScope *s, *first = NULL; | |
801ad6a6 | 684 | DnsQueryCandidate *c; |
8ba9fd9c LP |
685 | int r; |
686 | ||
687 | assert(q); | |
688 | ||
ec2c5e43 | 689 | if (q->state != DNS_TRANSACTION_NULL) |
8ba9fd9c LP |
690 | return 0; |
691 | ||
dd0bc0f1 LP |
692 | r = dns_query_try_etc_hosts(q); |
693 | if (r < 0) | |
694 | return r; | |
695 | if (r > 0) { | |
696 | dns_query_complete(q, DNS_TRANSACTION_SUCCESS); | |
697 | return 1; | |
698 | } | |
699 | ||
8ba9fd9c | 700 | LIST_FOREACH(scopes, s, q->manager->dns_scopes) { |
74b2466e | 701 | DnsScopeMatch match; |
23b298bc LP |
702 | const char *name; |
703 | ||
704 | name = dns_question_first_name(dns_query_question_for_protocol(q, s->protocol)); | |
705 | if (!name) | |
706 | continue; | |
74b2466e | 707 | |
51323288 | 708 | match = dns_scope_good_domain(s, q->ifindex, q->flags, name); |
74b2466e LP |
709 | if (match < 0) |
710 | return match; | |
711 | ||
712 | if (match == DNS_SCOPE_NO) | |
713 | continue; | |
714 | ||
715 | found = match; | |
716 | ||
717 | if (match == DNS_SCOPE_YES) { | |
718 | first = s; | |
719 | break; | |
720 | } else { | |
721 | assert(match == DNS_SCOPE_MAYBE); | |
722 | ||
723 | if (!first) | |
724 | first = s; | |
725 | } | |
726 | } | |
727 | ||
2a1037af LP |
728 | if (found == DNS_SCOPE_NO) { |
729 | DnsTransactionState state = DNS_TRANSACTION_NO_SERVERS; | |
730 | ||
7cc6ed7b LP |
731 | r = dns_query_synthesize_reply(q, &state); |
732 | if (r < 0) | |
733 | return r; | |
734 | ||
d634711b LP |
735 | dns_query_complete(q, state); |
736 | return 1; | |
2a1037af | 737 | } |
74b2466e | 738 | |
801ad6a6 | 739 | r = dns_query_add_candidate(q, first); |
74b2466e | 740 | if (r < 0) |
ec2c5e43 | 741 | goto fail; |
74b2466e | 742 | |
74b2466e LP |
743 | LIST_FOREACH(scopes, s, first->scopes_next) { |
744 | DnsScopeMatch match; | |
23b298bc LP |
745 | const char *name; |
746 | ||
747 | name = dns_question_first_name(dns_query_question_for_protocol(q, s->protocol)); | |
748 | if (!name) | |
749 | continue; | |
74b2466e | 750 | |
51323288 | 751 | match = dns_scope_good_domain(s, q->ifindex, q->flags, name); |
74b2466e | 752 | if (match < 0) |
ec2c5e43 | 753 | goto fail; |
74b2466e LP |
754 | |
755 | if (match != found) | |
756 | continue; | |
757 | ||
801ad6a6 | 758 | r = dns_query_add_candidate(q, s); |
74b2466e | 759 | if (r < 0) |
ec2c5e43 | 760 | goto fail; |
74b2466e LP |
761 | } |
762 | ||
ab88b6d0 | 763 | dns_query_reset_answer(q); |
74b2466e | 764 | |
9a015429 LP |
765 | r = sd_event_add_time( |
766 | q->manager->event, | |
767 | &q->timeout_event_source, | |
768 | clock_boottime_or_monotonic(), | |
4cbfd62b MCO |
769 | now(clock_boottime_or_monotonic()) + SD_RESOLVED_QUERY_TIMEOUT_USEC, |
770 | 0, on_query_timeout, q); | |
74b2466e LP |
771 | if (r < 0) |
772 | goto fail; | |
773 | ||
aa4a9deb LP |
774 | (void) sd_event_source_set_description(q->timeout_event_source, "query-timeout"); |
775 | ||
ec2c5e43 | 776 | q->state = DNS_TRANSACTION_PENDING; |
faa133f3 | 777 | q->block_ready++; |
74b2466e | 778 | |
801ad6a6 LP |
779 | /* Start the transactions */ |
780 | LIST_FOREACH(candidates_by_query, c, q->candidates) { | |
781 | r = dns_query_candidate_go(c); | |
782 | if (r < 0) { | |
783 | q->block_ready--; | |
ec2c5e43 | 784 | goto fail; |
801ad6a6 | 785 | } |
74b2466e LP |
786 | } |
787 | ||
faa133f3 LP |
788 | q->block_ready--; |
789 | dns_query_ready(q); | |
322345fd | 790 | |
8ba9fd9c | 791 | return 1; |
74b2466e LP |
792 | |
793 | fail: | |
8ba9fd9c | 794 | dns_query_stop(q); |
74b2466e LP |
795 | return r; |
796 | } | |
797 | ||
801ad6a6 | 798 | static void dns_query_accept(DnsQuery *q, DnsQueryCandidate *c) { |
ec2c5e43 | 799 | DnsTransactionState state = DNS_TRANSACTION_NO_SERVERS; |
547973de | 800 | bool has_authenticated = false, has_non_authenticated = false; |
019036a4 | 801 | DnssecResult dnssec_result_authenticated = _DNSSEC_RESULT_INVALID, dnssec_result_non_authenticated = _DNSSEC_RESULT_INVALID; |
801ad6a6 | 802 | DnsTransaction *t; |
faa133f3 | 803 | Iterator i; |
547973de | 804 | int r; |
74b2466e LP |
805 | |
806 | assert(q); | |
807 | ||
801ad6a6 | 808 | if (!c) { |
7cc6ed7b LP |
809 | r = dns_query_synthesize_reply(q, &state); |
810 | if (r < 0) | |
811 | goto fail; | |
812 | ||
801ad6a6 | 813 | dns_query_complete(q, state); |
74b2466e | 814 | return; |
801ad6a6 | 815 | } |
74b2466e | 816 | |
a7bf2ada LP |
817 | if (c->error_code != 0) { |
818 | /* If the candidate had an error condition of its own, start with that. */ | |
819 | state = DNS_TRANSACTION_ERRNO; | |
820 | q->answer = dns_answer_unref(q->answer); | |
821 | q->answer_rcode = 0; | |
822 | q->answer_dnssec_result = _DNSSEC_RESULT_INVALID; | |
cbb1aabb | 823 | q->answer_authenticated = false; |
a7bf2ada LP |
824 | q->answer_errno = c->error_code; |
825 | } | |
826 | ||
801ad6a6 | 827 | SET_FOREACH(t, c->transactions, i) { |
74b2466e | 828 | |
801ad6a6 | 829 | switch (t->state) { |
934e9b10 | 830 | |
801ad6a6 | 831 | case DNS_TRANSACTION_SUCCESS: { |
f8e2f4d6 | 832 | /* We found a successfully reply, merge it into the answer */ |
547973de | 833 | r = dns_answer_extend(&q->answer, t->answer); |
7cc6ed7b LP |
834 | if (r < 0) |
835 | goto fail; | |
019036a4 | 836 | |
ae6a4bbf | 837 | q->answer_rcode = t->answer_rcode; |
7cc6ed7b | 838 | q->answer_errno = 0; |
801ad6a6 | 839 | |
019036a4 | 840 | if (t->answer_authenticated) { |
931851e8 | 841 | has_authenticated = true; |
019036a4 LP |
842 | dnssec_result_authenticated = t->answer_dnssec_result; |
843 | } else { | |
931851e8 | 844 | has_non_authenticated = true; |
019036a4 LP |
845 | dnssec_result_non_authenticated = t->answer_dnssec_result; |
846 | } | |
931851e8 | 847 | |
801ad6a6 LP |
848 | state = DNS_TRANSACTION_SUCCESS; |
849 | break; | |
850 | } | |
851 | ||
801ad6a6 | 852 | case DNS_TRANSACTION_NULL: |
547973de LP |
853 | case DNS_TRANSACTION_PENDING: |
854 | case DNS_TRANSACTION_VALIDATING: | |
801ad6a6 LP |
855 | case DNS_TRANSACTION_ABORTED: |
856 | /* Ignore transactions that didn't complete */ | |
857 | continue; | |
858 | ||
859 | default: | |
cbb1aabb | 860 | /* Any kind of failure? Store the data away, if there's nothing stored yet. */ |
019036a4 LP |
861 | if (state == DNS_TRANSACTION_SUCCESS) |
862 | continue; | |
934e9b10 | 863 | |
cbb1aabb LP |
864 | /* If there's already an authenticated negative reply stored, then prefer that over any unauthenticated one */ |
865 | if (q->answer_authenticated && !t->answer_authenticated) | |
866 | continue; | |
867 | ||
d38d5ca6 | 868 | q->answer = dns_answer_unref(q->answer); |
019036a4 LP |
869 | q->answer_rcode = t->answer_rcode; |
870 | q->answer_dnssec_result = t->answer_dnssec_result; | |
cbb1aabb | 871 | q->answer_authenticated = t->answer_authenticated; |
7cc6ed7b | 872 | q->answer_errno = t->answer_errno; |
934e9b10 | 873 | |
019036a4 | 874 | state = t->state; |
801ad6a6 | 875 | break; |
74b2466e | 876 | } |
801ad6a6 | 877 | } |
74b2466e | 878 | |
019036a4 LP |
879 | if (state == DNS_TRANSACTION_SUCCESS) { |
880 | q->answer_authenticated = has_authenticated && !has_non_authenticated; | |
881 | q->answer_dnssec_result = q->answer_authenticated ? dnssec_result_authenticated : dnssec_result_non_authenticated; | |
882 | } | |
883 | ||
801ad6a6 LP |
884 | q->answer_protocol = c->scope->protocol; |
885 | q->answer_family = c->scope->family; | |
934e9b10 | 886 | |
801ad6a6 LP |
887 | dns_search_domain_unref(q->answer_search_domain); |
888 | q->answer_search_domain = dns_search_domain_ref(c->search_domain); | |
7e8e0422 | 889 | |
7cc6ed7b LP |
890 | r = dns_query_synthesize_reply(q, &state); |
891 | if (r < 0) | |
892 | goto fail; | |
893 | ||
801ad6a6 | 894 | dns_query_complete(q, state); |
7cc6ed7b LP |
895 | return; |
896 | ||
897 | fail: | |
898 | q->answer_errno = -r; | |
899 | dns_query_complete(q, DNS_TRANSACTION_ERRNO); | |
801ad6a6 | 900 | } |
934e9b10 | 901 | |
801ad6a6 | 902 | void dns_query_ready(DnsQuery *q) { |
74b2466e | 903 | |
801ad6a6 LP |
904 | DnsQueryCandidate *bad = NULL, *c; |
905 | bool pending = false; | |
74b2466e | 906 | |
801ad6a6 | 907 | assert(q); |
547973de | 908 | assert(DNS_TRANSACTION_IS_LIVE(q->state)); |
e4501ed4 | 909 | |
801ad6a6 LP |
910 | /* Note that this call might invalidate the query. Callers |
911 | * should hence not attempt to access the query or transaction | |
912 | * after calling this function, unless the block_ready | |
913 | * counter was explicitly bumped before doing so. */ | |
914 | ||
915 | if (q->block_ready > 0) | |
916 | return; | |
917 | ||
918 | LIST_FOREACH(candidates_by_query, c, q->candidates) { | |
919 | DnsTransactionState state; | |
920 | ||
921 | state = dns_query_candidate_state(c); | |
922 | switch (state) { | |
923 | ||
924 | case DNS_TRANSACTION_SUCCESS: | |
547973de | 925 | /* One of the candidates is successful, |
801ad6a6 LP |
926 | * let's use it, and copy its data out */ |
927 | dns_query_accept(q, c); | |
e4501ed4 LP |
928 | return; |
929 | ||
801ad6a6 | 930 | case DNS_TRANSACTION_NULL: |
547973de LP |
931 | case DNS_TRANSACTION_PENDING: |
932 | case DNS_TRANSACTION_VALIDATING: | |
933 | /* One of the candidates is still going on, | |
934 | * let's maybe wait for it */ | |
801ad6a6 LP |
935 | pending = true; |
936 | break; | |
e4501ed4 | 937 | |
801ad6a6 LP |
938 | default: |
939 | /* Any kind of failure */ | |
940 | bad = c; | |
941 | break; | |
942 | } | |
faa133f3 | 943 | } |
74b2466e | 944 | |
801ad6a6 LP |
945 | if (pending) |
946 | return; | |
2a1037af | 947 | |
801ad6a6 | 948 | dns_query_accept(q, bad); |
74b2466e | 949 | } |
8ba9fd9c | 950 | |
45ec7efb | 951 | static int dns_query_cname_redirect(DnsQuery *q, const DnsResourceRecord *cname) { |
23b298bc LP |
952 | _cleanup_(dns_question_unrefp) DnsQuestion *nq_idna = NULL, *nq_utf8 = NULL; |
953 | int r, k; | |
8ba9fd9c LP |
954 | |
955 | assert(q); | |
956 | ||
313cefa1 | 957 | q->n_cname_redirects++; |
faa133f3 | 958 | if (q->n_cname_redirects > CNAME_MAX) |
8ba9fd9c LP |
959 | return -ELOOP; |
960 | ||
23b298bc | 961 | r = dns_question_cname_redirect(q->question_idna, cname, &nq_idna); |
faa133f3 LP |
962 | if (r < 0) |
963 | return r; | |
23b298bc | 964 | else if (r > 0) |
8ec76e6a | 965 | log_debug("Following CNAME/DNAME %s → %s.", dns_question_first_name(q->question_idna), dns_question_first_name(nq_idna)); |
23b298bc LP |
966 | |
967 | k = dns_question_is_equal(q->question_idna, q->question_utf8); | |
968 | if (k < 0) | |
969 | return r; | |
970 | if (k > 0) { | |
971 | /* Same question? Shortcut new question generation */ | |
972 | nq_utf8 = dns_question_ref(nq_idna); | |
973 | k = r; | |
974 | } else { | |
975 | k = dns_question_cname_redirect(q->question_utf8, cname, &nq_utf8); | |
976 | if (k < 0) | |
977 | return k; | |
978 | else if (k > 0) | |
8ec76e6a | 979 | log_debug("Following UTF8 CNAME/DNAME %s → %s.", dns_question_first_name(q->question_utf8), dns_question_first_name(nq_utf8)); |
23b298bc | 980 | } |
8ba9fd9c | 981 | |
23b298bc LP |
982 | if (r == 0 && k == 0) /* No actual cname happened? */ |
983 | return -ELOOP; | |
984 | ||
8e5de09f LP |
985 | if (q->answer_protocol == DNS_PROTOCOL_DNS) { |
986 | /* Don't permit CNAME redirects from unicast DNS to LLMNR or MulticastDNS, so that global resources | |
987 | * cannot invade the local namespace. The opposite way we permit: local names may redirect to global | |
988 | * ones. */ | |
989 | ||
990 | q->flags &= ~(SD_RESOLVED_LLMNR|SD_RESOLVED_MDNS); /* mask away the local protocols */ | |
991 | } | |
992 | ||
993 | /* Turn off searching for the new name */ | |
994 | q->flags |= SD_RESOLVED_NO_SEARCH; | |
995 | ||
23b298bc LP |
996 | dns_question_unref(q->question_idna); |
997 | q->question_idna = nq_idna; | |
998 | nq_idna = NULL; | |
bc7669cf | 999 | |
23b298bc LP |
1000 | dns_question_unref(q->question_utf8); |
1001 | q->question_utf8 = nq_utf8; | |
1002 | nq_utf8 = NULL; | |
8ba9fd9c | 1003 | |
7820b320 LP |
1004 | dns_query_free_candidates(q); |
1005 | dns_query_reset_answer(q); | |
322345fd | 1006 | |
8e5de09f | 1007 | q->state = DNS_TRANSACTION_NULL; |
59a89990 | 1008 | |
8ba9fd9c LP |
1009 | return 0; |
1010 | } | |
82bd6ddd | 1011 | |
45ec7efb LP |
1012 | int dns_query_process_cname(DnsQuery *q) { |
1013 | _cleanup_(dns_resource_record_unrefp) DnsResourceRecord *cname = NULL; | |
23b298bc | 1014 | DnsQuestion *question; |
45ec7efb LP |
1015 | DnsResourceRecord *rr; |
1016 | int r; | |
1017 | ||
1018 | assert(q); | |
1019 | ||
7588460a TG |
1020 | if (!IN_SET(q->state, DNS_TRANSACTION_SUCCESS, DNS_TRANSACTION_NULL)) |
1021 | return DNS_QUERY_NOMATCH; | |
45ec7efb | 1022 | |
23b298bc | 1023 | question = dns_query_question_for_protocol(q, q->answer_protocol); |
45ec7efb | 1024 | |
23b298bc LP |
1025 | DNS_ANSWER_FOREACH(rr, q->answer) { |
1026 | r = dns_question_matches_rr(question, rr, DNS_SEARCH_DOMAIN_NAME(q->answer_search_domain)); | |
45ec7efb LP |
1027 | if (r < 0) |
1028 | return r; | |
1029 | if (r > 0) | |
7588460a | 1030 | return DNS_QUERY_MATCH; /* The answer matches directly, no need to follow cnames */ |
45ec7efb | 1031 | |
542e0c84 | 1032 | r = dns_question_matches_cname_or_dname(question, rr, DNS_SEARCH_DOMAIN_NAME(q->answer_search_domain)); |
45ec7efb LP |
1033 | if (r < 0) |
1034 | return r; | |
1035 | if (r > 0 && !cname) | |
1036 | cname = dns_resource_record_ref(rr); | |
1037 | } | |
1038 | ||
1039 | if (!cname) | |
7588460a | 1040 | return DNS_QUERY_NOMATCH; /* No match and no cname to follow */ |
45ec7efb LP |
1041 | |
1042 | if (q->flags & SD_RESOLVED_NO_CNAME) | |
1043 | return -ELOOP; | |
1044 | ||
28830a64 LP |
1045 | if (!q->answer_authenticated) |
1046 | q->previous_redirect_unauthenticated = true; | |
1047 | ||
45ec7efb LP |
1048 | /* OK, let's actually follow the CNAME */ |
1049 | r = dns_query_cname_redirect(q, cname); | |
1050 | if (r < 0) | |
1051 | return r; | |
1052 | ||
1053 | /* Let's see if the answer can already answer the new | |
1054 | * redirected question */ | |
7588460a TG |
1055 | r = dns_query_process_cname(q); |
1056 | if (r != DNS_QUERY_NOMATCH) | |
1057 | return r; | |
45ec7efb LP |
1058 | |
1059 | /* OK, it cannot, let's begin with the new query */ | |
1060 | r = dns_query_go(q); | |
1061 | if (r < 0) | |
1062 | return r; | |
1063 | ||
7588460a | 1064 | return DNS_QUERY_RESTARTED; /* We restarted the query for a new cname */ |
45ec7efb LP |
1065 | } |
1066 | ||
82bd6ddd LP |
1067 | static int on_bus_track(sd_bus_track *t, void *userdata) { |
1068 | DnsQuery *q = userdata; | |
1069 | ||
1070 | assert(t); | |
1071 | assert(q); | |
1072 | ||
1073 | log_debug("Client of active query vanished, aborting query."); | |
1074 | dns_query_complete(q, DNS_TRANSACTION_ABORTED); | |
1075 | return 0; | |
1076 | } | |
1077 | ||
966c66e3 | 1078 | int dns_query_bus_track(DnsQuery *q, sd_bus_message *m) { |
82bd6ddd LP |
1079 | int r; |
1080 | ||
1081 | assert(q); | |
1082 | assert(m); | |
1083 | ||
1084 | if (!q->bus_track) { | |
966c66e3 | 1085 | r = sd_bus_track_new(sd_bus_message_get_bus(m), &q->bus_track, on_bus_track, q); |
82bd6ddd LP |
1086 | if (r < 0) |
1087 | return r; | |
1088 | } | |
1089 | ||
1090 | r = sd_bus_track_add_sender(q->bus_track, m); | |
1091 | if (r < 0) | |
1092 | return r; | |
1093 | ||
1094 | return 0; | |
1095 | } | |
23b298bc LP |
1096 | |
1097 | DnsQuestion* dns_query_question_for_protocol(DnsQuery *q, DnsProtocol protocol) { | |
1098 | assert(q); | |
1099 | ||
1100 | switch (protocol) { | |
1101 | ||
1102 | case DNS_PROTOCOL_DNS: | |
1103 | return q->question_idna; | |
1104 | ||
1105 | case DNS_PROTOCOL_MDNS: | |
1106 | case DNS_PROTOCOL_LLMNR: | |
1107 | return q->question_utf8; | |
1108 | ||
1109 | default: | |
1110 | return NULL; | |
1111 | } | |
1112 | } | |
1113 | ||
1114 | const char *dns_query_string(DnsQuery *q) { | |
1115 | const char *name; | |
1116 | int r; | |
1117 | ||
1118 | /* Returns a somewhat useful human-readable lookup key string for this query */ | |
1119 | ||
1120 | if (q->request_address_string) | |
1121 | return q->request_address_string; | |
1122 | ||
1123 | if (q->request_address_valid) { | |
1124 | r = in_addr_to_string(q->request_family, &q->request_address, &q->request_address_string); | |
1125 | if (r >= 0) | |
1126 | return q->request_address_string; | |
1127 | } | |
1128 | ||
1129 | name = dns_question_first_name(q->question_utf8); | |
1130 | if (name) | |
1131 | return name; | |
1132 | ||
1133 | return dns_question_first_name(q->question_idna); | |
1134 | } | |
28830a64 LP |
1135 | |
1136 | bool dns_query_fully_authenticated(DnsQuery *q) { | |
1137 | assert(q); | |
1138 | ||
1139 | return q->answer_authenticated && !q->previous_redirect_unauthenticated; | |
1140 | } |