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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
623a4c97 | 2 | |
b5efdb8a | 3 | #include "alloc-util.h" |
4ad7f276 | 4 | #include "dns-domain.h" |
07630cea | 5 | #include "list.h" |
623a4c97 | 6 | #include "resolved-dns-packet.h" |
07630cea | 7 | #include "resolved-dns-zone.h" |
c3036641 | 8 | #include "resolved-dnssd.h" |
be28f72d | 9 | #include "resolved-manager.h" |
07630cea | 10 | #include "string-util.h" |
623a4c97 LP |
11 | |
12 | /* Never allow more than 1K entries */ | |
13 | #define ZONE_MAX 1024 | |
14 | ||
3ef64445 | 15 | void dns_zone_item_probe_stop(DnsZoneItem *i) { |
ec2c5e43 LP |
16 | DnsTransaction *t; |
17 | assert(i); | |
623a4c97 | 18 | |
ec2c5e43 LP |
19 | if (!i->probe_transaction) |
20 | return; | |
21 | ||
ae2a15bc | 22 | t = TAKE_PTR(i->probe_transaction); |
ec2c5e43 | 23 | |
547973de | 24 | set_remove(t->notify_zone_items, i); |
35aa04e9 | 25 | set_remove(t->notify_zone_items_done, i); |
ec2c5e43 LP |
26 | dns_transaction_gc(t); |
27 | } | |
623a4c97 LP |
28 | |
29 | static void dns_zone_item_free(DnsZoneItem *i) { | |
30 | if (!i) | |
31 | return; | |
32 | ||
ec2c5e43 | 33 | dns_zone_item_probe_stop(i); |
623a4c97 | 34 | dns_resource_record_unref(i->rr); |
ec2c5e43 | 35 | |
623a4c97 LP |
36 | free(i); |
37 | } | |
38 | ||
39 | DEFINE_TRIVIAL_CLEANUP_FUNC(DnsZoneItem*, dns_zone_item_free); | |
40 | ||
41 | static void dns_zone_item_remove_and_free(DnsZone *z, DnsZoneItem *i) { | |
42 | DnsZoneItem *first; | |
43 | ||
44 | assert(z); | |
45 | ||
46 | if (!i) | |
47 | return; | |
48 | ||
49 | first = hashmap_get(z->by_key, i->rr->key); | |
50 | LIST_REMOVE(by_key, first, i); | |
51 | if (first) | |
52 | assert_se(hashmap_replace(z->by_key, first->rr->key, first) >= 0); | |
53 | else | |
54 | hashmap_remove(z->by_key, i->rr->key); | |
55 | ||
1c02e7ba | 56 | first = hashmap_get(z->by_name, dns_resource_key_name(i->rr->key)); |
623a4c97 LP |
57 | LIST_REMOVE(by_name, first, i); |
58 | if (first) | |
1c02e7ba | 59 | assert_se(hashmap_replace(z->by_name, dns_resource_key_name(first->rr->key), first) >= 0); |
623a4c97 | 60 | else |
1c02e7ba | 61 | hashmap_remove(z->by_name, dns_resource_key_name(i->rr->key)); |
623a4c97 LP |
62 | |
63 | dns_zone_item_free(i); | |
64 | } | |
65 | ||
66 | void dns_zone_flush(DnsZone *z) { | |
67 | DnsZoneItem *i; | |
68 | ||
69 | assert(z); | |
70 | ||
71 | while ((i = hashmap_first(z->by_key))) | |
72 | dns_zone_item_remove_and_free(z, i); | |
73 | ||
74 | assert(hashmap_size(z->by_key) == 0); | |
75 | assert(hashmap_size(z->by_name) == 0); | |
76 | ||
525d3cc7 LP |
77 | z->by_key = hashmap_free(z->by_key); |
78 | z->by_name = hashmap_free(z->by_name); | |
623a4c97 LP |
79 | } |
80 | ||
8d67e72c | 81 | DnsZoneItem* dns_zone_get(DnsZone *z, DnsResourceRecord *rr) { |
623a4c97 LP |
82 | DnsZoneItem *i; |
83 | ||
84 | assert(z); | |
85 | assert(rr); | |
86 | ||
87 | LIST_FOREACH(by_key, i, hashmap_get(z->by_key, rr->key)) | |
3ef77d04 | 88 | if (dns_resource_record_equal(i->rr, rr) > 0) |
623a4c97 LP |
89 | return i; |
90 | ||
91 | return NULL; | |
92 | } | |
93 | ||
94 | void dns_zone_remove_rr(DnsZone *z, DnsResourceRecord *rr) { | |
95 | DnsZoneItem *i; | |
96 | ||
97 | assert(z); | |
98 | assert(rr); | |
99 | ||
100 | i = dns_zone_get(z, rr); | |
101 | if (i) | |
102 | dns_zone_item_remove_and_free(z, i); | |
103 | } | |
104 | ||
6db6a464 DR |
105 | int dns_zone_remove_rrs_by_key(DnsZone *z, DnsResourceKey *key) { |
106 | _cleanup_(dns_answer_unrefp) DnsAnswer *answer = NULL, *soa = NULL; | |
107 | DnsResourceRecord *rr; | |
108 | bool tentative; | |
109 | int r; | |
110 | ||
111 | r = dns_zone_lookup(z, key, 0, &answer, &soa, &tentative); | |
112 | if (r < 0) | |
113 | return r; | |
114 | ||
115 | DNS_ANSWER_FOREACH(rr, answer) | |
116 | dns_zone_remove_rr(z, rr); | |
117 | ||
118 | return 0; | |
119 | } | |
120 | ||
623a4c97 LP |
121 | static int dns_zone_init(DnsZone *z) { |
122 | int r; | |
123 | ||
124 | assert(z); | |
125 | ||
d5099efc | 126 | r = hashmap_ensure_allocated(&z->by_key, &dns_resource_key_hash_ops); |
623a4c97 LP |
127 | if (r < 0) |
128 | return r; | |
129 | ||
d5099efc | 130 | r = hashmap_ensure_allocated(&z->by_name, &dns_name_hash_ops); |
623a4c97 LP |
131 | if (r < 0) |
132 | return r; | |
133 | ||
134 | return 0; | |
135 | } | |
136 | ||
137 | static int dns_zone_link_item(DnsZone *z, DnsZoneItem *i) { | |
138 | DnsZoneItem *first; | |
139 | int r; | |
140 | ||
141 | first = hashmap_get(z->by_key, i->rr->key); | |
142 | if (first) { | |
143 | LIST_PREPEND(by_key, first, i); | |
144 | assert_se(hashmap_replace(z->by_key, first->rr->key, first) >= 0); | |
145 | } else { | |
146 | r = hashmap_put(z->by_key, i->rr->key, i); | |
147 | if (r < 0) | |
148 | return r; | |
149 | } | |
150 | ||
1c02e7ba | 151 | first = hashmap_get(z->by_name, dns_resource_key_name(i->rr->key)); |
623a4c97 LP |
152 | if (first) { |
153 | LIST_PREPEND(by_name, first, i); | |
1c02e7ba | 154 | assert_se(hashmap_replace(z->by_name, dns_resource_key_name(first->rr->key), first) >= 0); |
623a4c97 | 155 | } else { |
1c02e7ba | 156 | r = hashmap_put(z->by_name, dns_resource_key_name(i->rr->key), i); |
623a4c97 LP |
157 | if (r < 0) |
158 | return r; | |
159 | } | |
160 | ||
161 | return 0; | |
162 | } | |
163 | ||
ec2c5e43 | 164 | static int dns_zone_item_probe_start(DnsZoneItem *i) { |
29bd6012 | 165 | _cleanup_(dns_transaction_gcp) DnsTransaction *t = NULL; |
ec2c5e43 LP |
166 | int r; |
167 | ||
168 | assert(i); | |
169 | ||
170 | if (i->probe_transaction) | |
171 | return 0; | |
172 | ||
1c02e7ba | 173 | t = dns_scope_find_transaction(i->scope, &DNS_RESOURCE_KEY_CONST(i->rr->key->class, DNS_TYPE_ANY, dns_resource_key_name(i->rr->key)), false); |
ec2c5e43 | 174 | if (!t) { |
1b4f6e79 LP |
175 | _cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL; |
176 | ||
1c02e7ba | 177 | key = dns_resource_key_new(i->rr->key->class, DNS_TYPE_ANY, dns_resource_key_name(i->rr->key)); |
1b4f6e79 LP |
178 | if (!key) |
179 | return -ENOMEM; | |
180 | ||
f52e61da | 181 | r = dns_transaction_new(&t, i->scope, key); |
ec2c5e43 LP |
182 | if (r < 0) |
183 | return r; | |
184 | } | |
185 | ||
547973de | 186 | r = set_ensure_allocated(&t->notify_zone_items, NULL); |
ec2c5e43 | 187 | if (r < 0) |
29bd6012 | 188 | return r; |
ec2c5e43 | 189 | |
35aa04e9 LP |
190 | r = set_ensure_allocated(&t->notify_zone_items_done, NULL); |
191 | if (r < 0) | |
29bd6012 | 192 | return r; |
35aa04e9 | 193 | |
547973de | 194 | r = set_put(t->notify_zone_items, i); |
ec2c5e43 | 195 | if (r < 0) |
29bd6012 | 196 | return r; |
ec2c5e43 | 197 | |
53fda2bb | 198 | t->probing = true; |
29bd6012 | 199 | i->probe_transaction = TAKE_PTR(t); |
ec2c5e43 | 200 | |
29bd6012 | 201 | if (i->probe_transaction->state == DNS_TRANSACTION_NULL) { |
ec2c5e43 | 202 | i->block_ready++; |
29bd6012 | 203 | r = dns_transaction_go(i->probe_transaction); |
ec2c5e43 LP |
204 | i->block_ready--; |
205 | ||
206 | if (r < 0) { | |
207 | dns_zone_item_probe_stop(i); | |
208 | return r; | |
209 | } | |
210 | } | |
211 | ||
547973de | 212 | dns_zone_item_notify(i); |
ec2c5e43 | 213 | return 0; |
ec2c5e43 LP |
214 | } |
215 | ||
216 | int dns_zone_put(DnsZone *z, DnsScope *s, DnsResourceRecord *rr, bool probe) { | |
623a4c97 LP |
217 | _cleanup_(dns_zone_item_freep) DnsZoneItem *i = NULL; |
218 | DnsZoneItem *existing; | |
219 | int r; | |
220 | ||
221 | assert(z); | |
ec2c5e43 | 222 | assert(s); |
623a4c97 LP |
223 | assert(rr); |
224 | ||
222148b6 | 225 | if (dns_class_is_pseudo(rr->key->class)) |
1d3b690f | 226 | return -EINVAL; |
222148b6 | 227 | if (dns_type_is_pseudo(rr->key->type)) |
1d3b690f LP |
228 | return -EINVAL; |
229 | ||
623a4c97 LP |
230 | existing = dns_zone_get(z, rr); |
231 | if (existing) | |
232 | return 0; | |
233 | ||
234 | r = dns_zone_init(z); | |
235 | if (r < 0) | |
236 | return r; | |
237 | ||
238 | i = new0(DnsZoneItem, 1); | |
239 | if (!i) | |
240 | return -ENOMEM; | |
241 | ||
ec2c5e43 | 242 | i->scope = s; |
623a4c97 | 243 | i->rr = dns_resource_record_ref(rr); |
ec2c5e43 | 244 | i->probing_enabled = probe; |
623a4c97 LP |
245 | |
246 | r = dns_zone_link_item(z, i); | |
247 | if (r < 0) | |
248 | return r; | |
249 | ||
ec2c5e43 | 250 | if (probe) { |
cd1b20f9 LP |
251 | DnsZoneItem *first, *j; |
252 | bool established = false; | |
253 | ||
254 | /* Check if there's already an RR with the same name | |
255 | * established. If so, it has been probed already, and | |
5238e957 | 256 | * we don't need to probe again. */ |
cd1b20f9 LP |
257 | |
258 | LIST_FIND_HEAD(by_name, i, first); | |
259 | LIST_FOREACH(by_name, j, first) { | |
260 | if (i == j) | |
261 | continue; | |
262 | ||
263 | if (j->state == DNS_ZONE_ITEM_ESTABLISHED) | |
264 | established = true; | |
ec2c5e43 LP |
265 | } |
266 | ||
cd1b20f9 LP |
267 | if (established) |
268 | i->state = DNS_ZONE_ITEM_ESTABLISHED; | |
269 | else { | |
60eb3f7c LP |
270 | i->state = DNS_ZONE_ITEM_PROBING; |
271 | ||
cd1b20f9 LP |
272 | r = dns_zone_item_probe_start(i); |
273 | if (r < 0) { | |
274 | dns_zone_item_remove_and_free(z, i); | |
275 | i = NULL; | |
276 | return r; | |
277 | } | |
cd1b20f9 | 278 | } |
ec2c5e43 LP |
279 | } else |
280 | i->state = DNS_ZONE_ITEM_ESTABLISHED; | |
281 | ||
623a4c97 LP |
282 | i = NULL; |
283 | return 0; | |
284 | } | |
285 | ||
748a548e DR |
286 | static int dns_zone_add_authenticated_answer(DnsAnswer *a, DnsZoneItem *i, int ifindex) { |
287 | DnsAnswerFlags flags; | |
288 | ||
289 | /* From RFC 6762, Section 10.2 | |
290 | * "They (the rules about when to set the cache-flush bit) apply to | |
291 | * startup announcements as described in Section 8.3, "Announcing", | |
292 | * and to responses generated as a result of receiving query messages." | |
293 | * So, set the cache-flush bit for mDNS answers except for DNS-SD | |
294 | * service enumeration PTRs described in RFC 6763, Section 4.1. */ | |
295 | if (i->scope->protocol == DNS_PROTOCOL_MDNS && | |
296 | !dns_resource_key_is_dnssd_ptr(i->rr->key)) | |
297 | flags = DNS_ANSWER_AUTHENTICATED|DNS_ANSWER_CACHE_FLUSH; | |
298 | else | |
299 | flags = DNS_ANSWER_AUTHENTICATED; | |
300 | ||
301 | return dns_answer_add(a, i->rr, ifindex, flags); | |
302 | } | |
303 | ||
97ebebbc | 304 | int dns_zone_lookup(DnsZone *z, DnsResourceKey *key, int ifindex, DnsAnswer **ret_answer, DnsAnswer **ret_soa, bool *ret_tentative) { |
8bf52d3d | 305 | _cleanup_(dns_answer_unrefp) DnsAnswer *answer = NULL, *soa = NULL; |
5032b16d LP |
306 | unsigned n_answer = 0; |
307 | DnsZoneItem *j, *first; | |
308 | bool tentative = true, need_soa = false; | |
d5323661 | 309 | int r; |
623a4c97 | 310 | |
97ebebbc LP |
311 | /* Note that we don't actually need the ifindex for anything. However when it is passed we'll initialize the |
312 | * ifindex field in the answer with it */ | |
313 | ||
623a4c97 | 314 | assert(z); |
5032b16d | 315 | assert(key); |
8bf52d3d | 316 | assert(ret_answer); |
623a4c97 | 317 | |
5032b16d | 318 | /* First iteration, count what we have */ |
ec2c5e43 | 319 | |
5032b16d LP |
320 | if (key->type == DNS_TYPE_ANY || key->class == DNS_CLASS_ANY) { |
321 | bool found = false, added = false; | |
322 | int k; | |
623a4c97 | 323 | |
5032b16d LP |
324 | /* If this is a generic match, then we have to |
325 | * go through the list by the name and look | |
326 | * for everything manually */ | |
623a4c97 | 327 | |
1c02e7ba | 328 | first = hashmap_get(z->by_name, dns_resource_key_name(key)); |
5032b16d LP |
329 | LIST_FOREACH(by_name, j, first) { |
330 | if (!IN_SET(j->state, DNS_ZONE_ITEM_PROBING, DNS_ZONE_ITEM_ESTABLISHED, DNS_ZONE_ITEM_VERIFYING)) | |
331 | continue; | |
d5323661 | 332 | |
5032b16d | 333 | found = true; |
d5323661 | 334 | |
801ad6a6 | 335 | k = dns_resource_key_match_rr(key, j->rr, NULL); |
5032b16d LP |
336 | if (k < 0) |
337 | return k; | |
338 | if (k > 0) { | |
339 | n_answer++; | |
340 | added = true; | |
341 | } | |
ec2c5e43 | 342 | |
5032b16d | 343 | } |
ec2c5e43 | 344 | |
5032b16d LP |
345 | if (found && !added) |
346 | need_soa = true; | |
ec2c5e43 | 347 | |
5032b16d LP |
348 | } else { |
349 | bool found = false; | |
d5323661 | 350 | |
5032b16d LP |
351 | /* If this is a specific match, then look for |
352 | * the right key immediately */ | |
ec2c5e43 | 353 | |
5032b16d LP |
354 | first = hashmap_get(z->by_key, key); |
355 | LIST_FOREACH(by_key, j, first) { | |
356 | if (!IN_SET(j->state, DNS_ZONE_ITEM_PROBING, DNS_ZONE_ITEM_ESTABLISHED, DNS_ZONE_ITEM_VERIFYING)) | |
357 | continue; | |
ec2c5e43 | 358 | |
5032b16d LP |
359 | found = true; |
360 | n_answer++; | |
361 | } | |
ec2c5e43 | 362 | |
5032b16d | 363 | if (!found) { |
1c02e7ba | 364 | first = hashmap_get(z->by_name, dns_resource_key_name(key)); |
5032b16d | 365 | LIST_FOREACH(by_name, j, first) { |
ec2c5e43 LP |
366 | if (!IN_SET(j->state, DNS_ZONE_ITEM_PROBING, DNS_ZONE_ITEM_ESTABLISHED, DNS_ZONE_ITEM_VERIFYING)) |
367 | continue; | |
368 | ||
5032b16d LP |
369 | need_soa = true; |
370 | break; | |
d5323661 | 371 | } |
d5323661 | 372 | } |
623a4c97 LP |
373 | } |
374 | ||
5032b16d LP |
375 | if (n_answer <= 0 && !need_soa) |
376 | goto return_empty; | |
623a4c97 | 377 | |
8bf52d3d LP |
378 | if (n_answer > 0) { |
379 | answer = dns_answer_new(n_answer); | |
380 | if (!answer) | |
381 | return -ENOMEM; | |
382 | } | |
623a4c97 | 383 | |
5032b16d LP |
384 | if (need_soa) { |
385 | soa = dns_answer_new(1); | |
8bf52d3d LP |
386 | if (!soa) |
387 | return -ENOMEM; | |
388 | } | |
389 | ||
390 | /* Second iteration, actually add the RRs to the answers */ | |
5032b16d LP |
391 | if (key->type == DNS_TYPE_ANY || key->class == DNS_CLASS_ANY) { |
392 | bool found = false, added = false; | |
393 | int k; | |
d5323661 | 394 | |
1c02e7ba | 395 | first = hashmap_get(z->by_name, dns_resource_key_name(key)); |
5032b16d LP |
396 | LIST_FOREACH(by_name, j, first) { |
397 | if (!IN_SET(j->state, DNS_ZONE_ITEM_PROBING, DNS_ZONE_ITEM_ESTABLISHED, DNS_ZONE_ITEM_VERIFYING)) | |
398 | continue; | |
ec2c5e43 | 399 | |
5032b16d | 400 | found = true; |
ec2c5e43 | 401 | |
5032b16d LP |
402 | if (j->state != DNS_ZONE_ITEM_PROBING) |
403 | tentative = false; | |
ec2c5e43 | 404 | |
801ad6a6 | 405 | k = dns_resource_key_match_rr(key, j->rr, NULL); |
5032b16d LP |
406 | if (k < 0) |
407 | return k; | |
408 | if (k > 0) { | |
748a548e | 409 | r = dns_zone_add_authenticated_answer(answer, j, ifindex); |
d5323661 LP |
410 | if (r < 0) |
411 | return r; | |
5032b16d LP |
412 | |
413 | added = true; | |
d5323661 | 414 | } |
5032b16d | 415 | } |
d5323661 | 416 | |
5032b16d | 417 | if (found && !added) { |
97ebebbc | 418 | r = dns_answer_add_soa(soa, dns_resource_key_name(key), LLMNR_DEFAULT_TTL, ifindex); |
5032b16d LP |
419 | if (r < 0) |
420 | return r; | |
421 | } | |
422 | } else { | |
423 | bool found = false; | |
ec2c5e43 | 424 | |
5032b16d LP |
425 | first = hashmap_get(z->by_key, key); |
426 | LIST_FOREACH(by_key, j, first) { | |
427 | if (!IN_SET(j->state, DNS_ZONE_ITEM_PROBING, DNS_ZONE_ITEM_ESTABLISHED, DNS_ZONE_ITEM_VERIFYING)) | |
428 | continue; | |
ec2c5e43 | 429 | |
5032b16d | 430 | found = true; |
ec2c5e43 | 431 | |
5032b16d LP |
432 | if (j->state != DNS_ZONE_ITEM_PROBING) |
433 | tentative = false; | |
ec2c5e43 | 434 | |
748a548e | 435 | r = dns_zone_add_authenticated_answer(answer, j, ifindex); |
5032b16d LP |
436 | if (r < 0) |
437 | return r; | |
438 | } | |
ec2c5e43 | 439 | |
5032b16d LP |
440 | if (!found) { |
441 | bool add_soa = false; | |
ec2c5e43 | 442 | |
1c02e7ba | 443 | first = hashmap_get(z->by_name, dns_resource_key_name(key)); |
5032b16d LP |
444 | LIST_FOREACH(by_name, j, first) { |
445 | if (!IN_SET(j->state, DNS_ZONE_ITEM_PROBING, DNS_ZONE_ITEM_ESTABLISHED, DNS_ZONE_ITEM_VERIFYING)) | |
446 | continue; | |
ec2c5e43 | 447 | |
5032b16d LP |
448 | if (j->state != DNS_ZONE_ITEM_PROBING) |
449 | tentative = false; | |
ec2c5e43 | 450 | |
5032b16d LP |
451 | add_soa = true; |
452 | } | |
453 | ||
454 | if (add_soa) { | |
97ebebbc | 455 | r = dns_answer_add_soa(soa, dns_resource_key_name(key), LLMNR_DEFAULT_TTL, ifindex); |
5032b16d LP |
456 | if (r < 0) |
457 | return r; | |
d5323661 | 458 | } |
623a4c97 LP |
459 | } |
460 | } | |
461 | ||
5032b16d LP |
462 | /* If the caller sets ret_tentative to NULL, then use this as |
463 | * indication to not return tentative entries */ | |
464 | ||
465 | if (!ret_tentative && tentative) | |
466 | goto return_empty; | |
467 | ||
1cc6c93a | 468 | *ret_answer = TAKE_PTR(answer); |
623a4c97 | 469 | |
1cc6c93a YW |
470 | if (ret_soa) |
471 | *ret_soa = TAKE_PTR(soa); | |
8bf52d3d | 472 | |
ec2c5e43 LP |
473 | if (ret_tentative) |
474 | *ret_tentative = tentative; | |
475 | ||
623a4c97 | 476 | return 1; |
5032b16d LP |
477 | |
478 | return_empty: | |
479 | *ret_answer = NULL; | |
480 | ||
481 | if (ret_soa) | |
482 | *ret_soa = NULL; | |
483 | ||
484 | if (ret_tentative) | |
485 | *ret_tentative = false; | |
486 | ||
487 | return 0; | |
623a4c97 | 488 | } |
ec2c5e43 LP |
489 | |
490 | void dns_zone_item_conflict(DnsZoneItem *i) { | |
ec2c5e43 LP |
491 | assert(i); |
492 | ||
a4076574 LP |
493 | if (!IN_SET(i->state, DNS_ZONE_ITEM_PROBING, DNS_ZONE_ITEM_VERIFYING, DNS_ZONE_ITEM_ESTABLISHED)) |
494 | return; | |
495 | ||
7b50eb2e | 496 | log_info("Detected conflict on %s", strna(dns_resource_record_to_string(i->rr))); |
ec2c5e43 | 497 | |
d84b686f LP |
498 | dns_zone_item_probe_stop(i); |
499 | ||
ec2c5e43 LP |
500 | /* Withdraw the conflict item */ |
501 | i->state = DNS_ZONE_ITEM_WITHDRAWN; | |
502 | ||
c3036641 DR |
503 | dnssd_signal_conflict(i->scope->manager, dns_resource_key_name(i->rr->key)); |
504 | ||
ec2c5e43 | 505 | /* Maybe change the hostname */ |
1c02e7ba | 506 | if (manager_is_own_hostname(i->scope->manager, dns_resource_key_name(i->rr->key)) > 0) |
ec2c5e43 LP |
507 | manager_next_hostname(i->scope->manager); |
508 | } | |
509 | ||
547973de | 510 | void dns_zone_item_notify(DnsZoneItem *i) { |
ec2c5e43 LP |
511 | assert(i); |
512 | assert(i->probe_transaction); | |
513 | ||
514 | if (i->block_ready > 0) | |
515 | return; | |
516 | ||
547973de | 517 | if (IN_SET(i->probe_transaction->state, DNS_TRANSACTION_NULL, DNS_TRANSACTION_PENDING, DNS_TRANSACTION_VALIDATING)) |
ec2c5e43 LP |
518 | return; |
519 | ||
a4076574 LP |
520 | if (i->probe_transaction->state == DNS_TRANSACTION_SUCCESS) { |
521 | bool we_lost = false; | |
ec2c5e43 | 522 | |
a4076574 | 523 | /* The probe got a successful reply. If we so far |
008d4ab7 DR |
524 | * weren't established we just give up. |
525 | * | |
526 | * In LLMNR case if we already | |
a4076574 | 527 | * were established, and the peer has the |
4d91eec4 | 528 | * lexicographically larger IP address we continue |
a4076574 LP |
529 | * and defend it. */ |
530 | ||
2fb3034c LP |
531 | if (!IN_SET(i->state, DNS_ZONE_ITEM_ESTABLISHED, DNS_ZONE_ITEM_VERIFYING)) { |
532 | log_debug("Got a successful probe for not yet established RR, we lost."); | |
a4076574 | 533 | we_lost = true; |
008d4ab7 | 534 | } else if (i->probe_transaction->scope->protocol == DNS_PROTOCOL_LLMNR) { |
a4076574 | 535 | assert(i->probe_transaction->received); |
4d91eec4 | 536 | we_lost = memcmp(&i->probe_transaction->received->sender, &i->probe_transaction->received->destination, FAMILY_ADDRESS_SIZE(i->probe_transaction->received->family)) < 0; |
2fb3034c | 537 | if (we_lost) |
4d91eec4 | 538 | log_debug("Got a successful probe reply for an established RR, and we have a lexicographically larger IP address and thus lost."); |
a4076574 LP |
539 | } |
540 | ||
541 | if (we_lost) { | |
542 | dns_zone_item_conflict(i); | |
543 | return; | |
544 | } | |
545 | ||
546 | log_debug("Got a successful probe reply, but peer has lexicographically lower IP address and thus lost."); | |
547 | } | |
548 | ||
7b50eb2e | 549 | log_debug("Record %s successfully probed.", strna(dns_resource_record_to_string(i->rr))); |
ec2c5e43 | 550 | |
a4076574 LP |
551 | dns_zone_item_probe_stop(i); |
552 | i->state = DNS_ZONE_ITEM_ESTABLISHED; | |
553 | } | |
554 | ||
555 | static int dns_zone_item_verify(DnsZoneItem *i) { | |
556 | int r; | |
557 | ||
558 | assert(i); | |
559 | ||
560 | if (i->state != DNS_ZONE_ITEM_ESTABLISHED) | |
561 | return 0; | |
562 | ||
7b50eb2e | 563 | log_debug("Verifying RR %s", strna(dns_resource_record_to_string(i->rr))); |
2fb3034c | 564 | |
a4076574 LP |
565 | i->state = DNS_ZONE_ITEM_VERIFYING; |
566 | r = dns_zone_item_probe_start(i); | |
567 | if (r < 0) { | |
da927ba9 | 568 | log_error_errno(r, "Failed to start probing for verifying RR: %m"); |
ec2c5e43 | 569 | i->state = DNS_ZONE_ITEM_ESTABLISHED; |
a4076574 LP |
570 | return r; |
571 | } | |
572 | ||
573 | return 0; | |
574 | } | |
575 | ||
576 | int dns_zone_check_conflicts(DnsZone *zone, DnsResourceRecord *rr) { | |
577 | DnsZoneItem *i, *first; | |
bf1594f5 | 578 | int c = 0; |
a4076574 LP |
579 | |
580 | assert(zone); | |
581 | assert(rr); | |
582 | ||
583 | /* This checks whether a response RR we received from somebody | |
584 | * else is one that we actually thought was uniquely ours. If | |
585 | * so, we'll verify our RRs. */ | |
586 | ||
587 | /* No conflict if we don't have the name at all. */ | |
1c02e7ba | 588 | first = hashmap_get(zone->by_name, dns_resource_key_name(rr->key)); |
a4076574 LP |
589 | if (!first) |
590 | return 0; | |
591 | ||
592 | /* No conflict if we have the exact same RR */ | |
593 | if (dns_zone_get(zone, rr)) | |
594 | return 0; | |
595 | ||
d686f15c DR |
596 | /* No conflict if it is DNS-SD RR used for service enumeration. */ |
597 | if (dns_resource_key_is_dnssd_ptr(rr->key)) | |
598 | return 0; | |
599 | ||
a4076574 LP |
600 | /* OK, somebody else has RRs for the same name. Yuck! Let's |
601 | * start probing again */ | |
602 | ||
603 | LIST_FOREACH(by_name, i, first) { | |
604 | if (dns_resource_record_equal(i->rr, rr)) | |
605 | continue; | |
606 | ||
607 | dns_zone_item_verify(i); | |
608 | c++; | |
609 | } | |
610 | ||
611 | return c; | |
612 | } | |
613 | ||
614 | int dns_zone_verify_conflicts(DnsZone *zone, DnsResourceKey *key) { | |
615 | DnsZoneItem *i, *first; | |
bf1594f5 | 616 | int c = 0; |
a4076574 LP |
617 | |
618 | assert(zone); | |
619 | ||
620 | /* Somebody else notified us about a possible conflict. Let's | |
621 | * verify if that's true. */ | |
622 | ||
1c02e7ba | 623 | first = hashmap_get(zone->by_name, dns_resource_key_name(key)); |
a4076574 LP |
624 | if (!first) |
625 | return 0; | |
626 | ||
627 | LIST_FOREACH(by_name, i, first) { | |
628 | dns_zone_item_verify(i); | |
629 | c++; | |
630 | } | |
631 | ||
632 | return c; | |
ec2c5e43 | 633 | } |
902bb5d8 LP |
634 | |
635 | void dns_zone_verify_all(DnsZone *zone) { | |
636 | DnsZoneItem *i; | |
637 | Iterator iterator; | |
638 | ||
639 | assert(zone); | |
640 | ||
641 | HASHMAP_FOREACH(i, zone->by_key, iterator) { | |
642 | DnsZoneItem *j; | |
643 | ||
644 | LIST_FOREACH(by_key, j, i) | |
645 | dns_zone_item_verify(j); | |
646 | } | |
647 | } | |
4d506d6b LP |
648 | |
649 | void dns_zone_dump(DnsZone *zone, FILE *f) { | |
650 | Iterator iterator; | |
651 | DnsZoneItem *i; | |
4d506d6b LP |
652 | |
653 | if (!zone) | |
654 | return; | |
655 | ||
656 | if (!f) | |
657 | f = stdout; | |
658 | ||
659 | HASHMAP_FOREACH(i, zone->by_key, iterator) { | |
660 | DnsZoneItem *j; | |
661 | ||
662 | LIST_FOREACH(by_key, j, i) { | |
7b50eb2e | 663 | const char *t; |
4d506d6b | 664 | |
7b50eb2e LP |
665 | t = dns_resource_record_to_string(j->rr); |
666 | if (!t) { | |
4d506d6b LP |
667 | log_oom(); |
668 | continue; | |
669 | } | |
670 | ||
671 | fputc('\t', f); | |
672 | fputs(t, f); | |
673 | fputc('\n', f); | |
674 | } | |
675 | } | |
676 | } | |
677 | ||
678 | bool dns_zone_is_empty(DnsZone *zone) { | |
679 | if (!zone) | |
680 | return true; | |
681 | ||
682 | return hashmap_isempty(zone->by_key); | |
683 | } | |
a2bf8a19 DR |
684 | |
685 | bool dns_zone_contains_name(DnsZone *z, const char *name) { | |
686 | DnsZoneItem *i, *first; | |
687 | ||
688 | first = hashmap_get(z->by_name, name); | |
689 | if (!first) | |
690 | return false; | |
691 | ||
692 | LIST_FOREACH(by_name, i, first) { | |
693 | if (!IN_SET(i->state, DNS_ZONE_ITEM_PROBING, DNS_ZONE_ITEM_ESTABLISHED, DNS_ZONE_ITEM_VERIFYING)) | |
694 | continue; | |
695 | ||
696 | return true; | |
697 | } | |
698 | ||
699 | return false; | |
700 | } |