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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 | ||
ad867662 LP |
20 | #include <netinet/tcp.h> |
21 | ||
46f08bea | 22 | #include "af-list.h" |
b5efdb8a | 23 | #include "alloc-util.h" |
4ad7f276 | 24 | #include "dns-domain.h" |
3ffd4af2 LP |
25 | #include "fd-util.h" |
26 | #include "hostname-util.h" | |
27 | #include "missing.h" | |
28 | #include "random-util.h" | |
74b2466e | 29 | #include "resolved-dns-scope.h" |
3ffd4af2 | 30 | #include "resolved-llmnr.h" |
b4f1862d | 31 | #include "resolved-mdns.h" |
3ffd4af2 LP |
32 | #include "socket-util.h" |
33 | #include "strv.h" | |
74b2466e | 34 | |
aea2429d LP |
35 | #define MULTICAST_RATELIMIT_INTERVAL_USEC (1*USEC_PER_SEC) |
36 | #define MULTICAST_RATELIMIT_BURST 1000 | |
37 | ||
9df3ba6c TG |
38 | /* After how much time to repeat LLMNR requests, see RFC 4795 Section 7 */ |
39 | #define MULTICAST_RESEND_TIMEOUT_MIN_USEC (100 * USEC_PER_MSEC) | |
40 | #define MULTICAST_RESEND_TIMEOUT_MAX_USEC (1 * USEC_PER_SEC) | |
41 | ||
0dd25fb9 | 42 | int dns_scope_new(Manager *m, DnsScope **ret, Link *l, DnsProtocol protocol, int family) { |
74b2466e LP |
43 | DnsScope *s; |
44 | ||
45 | assert(m); | |
46 | assert(ret); | |
47 | ||
48 | s = new0(DnsScope, 1); | |
49 | if (!s) | |
50 | return -ENOMEM; | |
51 | ||
52 | s->manager = m; | |
1716f6dc LP |
53 | s->link = l; |
54 | s->protocol = protocol; | |
55 | s->family = family; | |
9df3ba6c | 56 | s->resend_timeout = MULTICAST_RESEND_TIMEOUT_MIN_USEC; |
74b2466e | 57 | |
ad6c0475 LP |
58 | if (protocol == DNS_PROTOCOL_DNS) { |
59 | /* Copy DNSSEC mode from the link if it is set there, | |
60 | * otherwise take the manager's DNSSEC mode. Note that | |
61 | * we copy this only at scope creation time, and do | |
62 | * not update it from the on, even if the setting | |
63 | * changes. */ | |
64 | ||
65 | if (l) | |
c69fa7e3 LP |
66 | s->dnssec_mode = link_get_dnssec_mode(l); |
67 | else | |
68 | s->dnssec_mode = manager_get_dnssec_mode(m); | |
658f7f02 LP |
69 | } else |
70 | s->dnssec_mode = DNSSEC_NO; | |
ad6c0475 | 71 | |
74b2466e LP |
72 | LIST_PREPEND(scopes, m->dns_scopes, s); |
73 | ||
1716f6dc | 74 | dns_scope_llmnr_membership(s, true); |
0db4c90a | 75 | dns_scope_mdns_membership(s, true); |
1716f6dc | 76 | |
46f08bea | 77 | log_debug("New scope on link %s, protocol %s, family %s", l ? l->name : "*", dns_protocol_to_string(protocol), family == AF_UNSPEC ? "*" : af_to_name(family)); |
1716f6dc | 78 | |
aea2429d LP |
79 | /* Enforce ratelimiting for the multicast protocols */ |
80 | RATELIMIT_INIT(s->ratelimit, MULTICAST_RATELIMIT_INTERVAL_USEC, MULTICAST_RATELIMIT_BURST); | |
81 | ||
74b2466e LP |
82 | *ret = s; |
83 | return 0; | |
84 | } | |
85 | ||
801ad6a6 | 86 | static void dns_scope_abort_transactions(DnsScope *s) { |
801ad6a6 | 87 | assert(s); |
1716f6dc | 88 | |
f9ebb22a LP |
89 | while (s->transactions) { |
90 | DnsTransaction *t = s->transactions; | |
91 | ||
faa133f3 LP |
92 | /* Abort the transaction, but make sure it is not |
93 | * freed while we still look at it */ | |
74b2466e | 94 | |
faa133f3 | 95 | t->block_gc++; |
f4e38037 LP |
96 | if (DNS_TRANSACTION_IS_LIVE(t->state)) |
97 | dns_transaction_complete(t, DNS_TRANSACTION_ABORTED); | |
faa133f3 | 98 | t->block_gc--; |
74b2466e | 99 | |
ec2c5e43 | 100 | dns_transaction_free(t); |
74b2466e | 101 | } |
801ad6a6 LP |
102 | } |
103 | ||
104 | DnsScope* dns_scope_free(DnsScope *s) { | |
105 | DnsResourceRecord *rr; | |
106 | ||
107 | if (!s) | |
108 | return NULL; | |
109 | ||
110 | log_debug("Removing scope on link %s, protocol %s, family %s", s->link ? s->link->name : "*", dns_protocol_to_string(s->protocol), s->family == AF_UNSPEC ? "*" : af_to_name(s->family)); | |
111 | ||
112 | dns_scope_llmnr_membership(s, false); | |
0db4c90a | 113 | dns_scope_mdns_membership(s, false); |
801ad6a6 LP |
114 | dns_scope_abort_transactions(s); |
115 | ||
116 | while (s->query_candidates) | |
117 | dns_query_candidate_free(s->query_candidates); | |
74b2466e | 118 | |
f9ebb22a | 119 | hashmap_free(s->transactions_by_key); |
da0c630e | 120 | |
1e43061b | 121 | while ((rr = ordered_hashmap_steal_first(s->conflict_queue))) |
a4076574 LP |
122 | dns_resource_record_unref(rr); |
123 | ||
1e43061b | 124 | ordered_hashmap_free(s->conflict_queue); |
a4076574 LP |
125 | sd_event_source_unref(s->conflict_event_source); |
126 | ||
322345fd | 127 | dns_cache_flush(&s->cache); |
623a4c97 | 128 | dns_zone_flush(&s->zone); |
322345fd | 129 | |
74b2466e | 130 | LIST_REMOVE(scopes, s->manager->dns_scopes, s); |
74b2466e LP |
131 | free(s); |
132 | ||
133 | return NULL; | |
134 | } | |
135 | ||
2c27fbca | 136 | DnsServer *dns_scope_get_dns_server(DnsScope *s) { |
74b2466e LP |
137 | assert(s); |
138 | ||
1716f6dc LP |
139 | if (s->protocol != DNS_PROTOCOL_DNS) |
140 | return NULL; | |
141 | ||
74b2466e LP |
142 | if (s->link) |
143 | return link_get_dns_server(s->link); | |
144 | else | |
145 | return manager_get_dns_server(s->manager); | |
146 | } | |
147 | ||
148 | void dns_scope_next_dns_server(DnsScope *s) { | |
149 | assert(s); | |
150 | ||
1716f6dc LP |
151 | if (s->protocol != DNS_PROTOCOL_DNS) |
152 | return; | |
153 | ||
74b2466e LP |
154 | if (s->link) |
155 | link_next_dns_server(s->link); | |
156 | else | |
157 | manager_next_dns_server(s->manager); | |
158 | } | |
159 | ||
9df3ba6c TG |
160 | void dns_scope_packet_received(DnsScope *s, usec_t rtt) { |
161 | assert(s); | |
162 | ||
84129d46 LP |
163 | if (rtt <= s->max_rtt) |
164 | return; | |
165 | ||
166 | s->max_rtt = rtt; | |
167 | s->resend_timeout = MIN(MAX(MULTICAST_RESEND_TIMEOUT_MIN_USEC, s->max_rtt * 2), MULTICAST_RESEND_TIMEOUT_MAX_USEC); | |
9df3ba6c TG |
168 | } |
169 | ||
170 | void dns_scope_packet_lost(DnsScope *s, usec_t usec) { | |
171 | assert(s); | |
172 | ||
173 | if (s->resend_timeout <= usec) | |
174 | s->resend_timeout = MIN(s->resend_timeout * 2, MULTICAST_RESEND_TIMEOUT_MAX_USEC); | |
175 | } | |
176 | ||
519ef046 | 177 | static int dns_scope_emit_one(DnsScope *s, int fd, DnsPacket *p) { |
1716f6dc LP |
178 | union in_addr_union addr; |
179 | int ifindex = 0, r; | |
0dd25fb9 | 180 | int family; |
1716f6dc | 181 | uint32_t mtu; |
74b2466e LP |
182 | |
183 | assert(s); | |
184 | assert(p); | |
1716f6dc | 185 | assert(p->protocol == s->protocol); |
ad867662 LP |
186 | |
187 | if (s->link) { | |
1716f6dc | 188 | mtu = s->link->mtu; |
74b2466e | 189 | ifindex = s->link->ifindex; |
1716f6dc | 190 | } else |
e1c95994 | 191 | mtu = manager_find_mtu(s->manager); |
74b2466e | 192 | |
106784eb | 193 | switch (s->protocol) { |
519ef046 | 194 | |
106784eb | 195 | case DNS_PROTOCOL_DNS: |
519ef046 | 196 | assert(fd >= 0); |
9c5e12a4 | 197 | |
623a4c97 | 198 | if (DNS_PACKET_QDCOUNT(p) > 1) |
15411c0c | 199 | return -EOPNOTSUPP; |
623a4c97 | 200 | |
1716f6dc LP |
201 | if (p->size > DNS_PACKET_UNICAST_SIZE_MAX) |
202 | return -EMSGSIZE; | |
203 | ||
a0166609 | 204 | if (p->size + UDP_PACKET_HEADER_SIZE > mtu) |
1716f6dc LP |
205 | return -EMSGSIZE; |
206 | ||
72290734 TG |
207 | r = manager_write(s->manager, fd, p); |
208 | if (r < 0) | |
209 | return r; | |
210 | ||
106784eb | 211 | break; |
1716f6dc | 212 | |
106784eb | 213 | case DNS_PROTOCOL_LLMNR: |
519ef046 LP |
214 | assert(fd < 0); |
215 | ||
1716f6dc | 216 | if (DNS_PACKET_QDCOUNT(p) > 1) |
15411c0c | 217 | return -EOPNOTSUPP; |
1716f6dc | 218 | |
aea2429d LP |
219 | if (!ratelimit_test(&s->ratelimit)) |
220 | return -EBUSY; | |
221 | ||
1716f6dc | 222 | family = s->family; |
1716f6dc LP |
223 | |
224 | if (family == AF_INET) { | |
225 | addr.in = LLMNR_MULTICAST_IPV4_ADDRESS; | |
1716f6dc LP |
226 | fd = manager_llmnr_ipv4_udp_fd(s->manager); |
227 | } else if (family == AF_INET6) { | |
228 | addr.in6 = LLMNR_MULTICAST_IPV6_ADDRESS; | |
229 | fd = manager_llmnr_ipv6_udp_fd(s->manager); | |
1716f6dc LP |
230 | } else |
231 | return -EAFNOSUPPORT; | |
232 | if (fd < 0) | |
233 | return fd; | |
72290734 | 234 | |
b4f1862d DM |
235 | r = manager_send(s->manager, fd, ifindex, family, &addr, LLMNR_PORT, p); |
236 | if (r < 0) | |
237 | return r; | |
238 | ||
239 | break; | |
240 | ||
241 | case DNS_PROTOCOL_MDNS: | |
519ef046 LP |
242 | assert(fd < 0); |
243 | ||
b4f1862d DM |
244 | if (!ratelimit_test(&s->ratelimit)) |
245 | return -EBUSY; | |
246 | ||
247 | family = s->family; | |
248 | ||
249 | if (family == AF_INET) { | |
250 | addr.in = MDNS_MULTICAST_IPV4_ADDRESS; | |
251 | fd = manager_mdns_ipv4_fd(s->manager); | |
252 | } else if (family == AF_INET6) { | |
253 | addr.in6 = MDNS_MULTICAST_IPV6_ADDRESS; | |
254 | fd = manager_mdns_ipv6_fd(s->manager); | |
255 | } else | |
256 | return -EAFNOSUPPORT; | |
257 | if (fd < 0) | |
258 | return fd; | |
259 | ||
260 | r = manager_send(s->manager, fd, ifindex, family, &addr, MDNS_PORT, p); | |
72290734 TG |
261 | if (r < 0) |
262 | return r; | |
106784eb DM |
263 | |
264 | break; | |
265 | ||
266 | default: | |
74b2466e | 267 | return -EAFNOSUPPORT; |
106784eb | 268 | } |
74b2466e | 269 | |
74b2466e LP |
270 | return 1; |
271 | } | |
272 | ||
519ef046 | 273 | int dns_scope_emit_udp(DnsScope *s, int fd, DnsPacket *p) { |
80a62095 DM |
274 | int r; |
275 | ||
276 | assert(s); | |
277 | assert(p); | |
278 | assert(p->protocol == s->protocol); | |
519ef046 | 279 | assert((s->protocol == DNS_PROTOCOL_DNS) == (fd >= 0)); |
80a62095 DM |
280 | |
281 | do { | |
282 | /* If there are multiple linked packets, set the TC bit in all but the last of them */ | |
283 | if (p->more) { | |
284 | assert(p->protocol == DNS_PROTOCOL_MDNS); | |
261f3673 | 285 | dns_packet_set_flags(p, true, true); |
80a62095 DM |
286 | } |
287 | ||
519ef046 | 288 | r = dns_scope_emit_one(s, fd, p); |
80a62095 DM |
289 | if (r < 0) |
290 | return r; | |
291 | ||
292 | p = p->more; | |
519ef046 | 293 | } while (p); |
80a62095 DM |
294 | |
295 | return 0; | |
296 | } | |
297 | ||
519ef046 LP |
298 | static int dns_scope_socket( |
299 | DnsScope *s, | |
300 | int type, | |
301 | int family, | |
302 | const union in_addr_union *address, | |
303 | DnsServer *server, | |
304 | uint16_t port) { | |
305 | ||
ad867662 LP |
306 | _cleanup_close_ int fd = -1; |
307 | union sockaddr_union sa = {}; | |
308 | socklen_t salen; | |
623a4c97 LP |
309 | static const int one = 1; |
310 | int ret, r; | |
ad867662 LP |
311 | |
312 | assert(s); | |
be808ea0 | 313 | |
519ef046 LP |
314 | if (server) { |
315 | assert(family == AF_UNSPEC); | |
316 | assert(!address); | |
be808ea0 | 317 | |
519ef046 LP |
318 | sa.sa.sa_family = server->family; |
319 | if (server->family == AF_INET) { | |
623a4c97 | 320 | sa.in.sin_port = htobe16(port); |
519ef046 | 321 | sa.in.sin_addr = server->address.in; |
623a4c97 | 322 | salen = sizeof(sa.in); |
519ef046 | 323 | } else if (server->family == AF_INET6) { |
623a4c97 | 324 | sa.in6.sin6_port = htobe16(port); |
519ef046 | 325 | sa.in6.sin6_addr = server->address.in6; |
623a4c97 LP |
326 | sa.in6.sin6_scope_id = s->link ? s->link->ifindex : 0; |
327 | salen = sizeof(sa.in6); | |
328 | } else | |
329 | return -EAFNOSUPPORT; | |
330 | } else { | |
519ef046 LP |
331 | assert(family != AF_UNSPEC); |
332 | assert(address); | |
333 | ||
623a4c97 LP |
334 | sa.sa.sa_family = family; |
335 | ||
336 | if (family == AF_INET) { | |
337 | sa.in.sin_port = htobe16(port); | |
338 | sa.in.sin_addr = address->in; | |
339 | salen = sizeof(sa.in); | |
340 | } else if (family == AF_INET6) { | |
341 | sa.in6.sin6_port = htobe16(port); | |
342 | sa.in6.sin6_addr = address->in6; | |
343 | sa.in6.sin6_scope_id = s->link ? s->link->ifindex : 0; | |
344 | salen = sizeof(sa.in6); | |
345 | } else | |
346 | return -EAFNOSUPPORT; | |
347 | } | |
ad867662 | 348 | |
0db64366 | 349 | fd = socket(sa.sa.sa_family, type|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); |
ad867662 LP |
350 | if (fd < 0) |
351 | return -errno; | |
352 | ||
0db64366 TG |
353 | if (type == SOCK_STREAM) { |
354 | r = setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &one, sizeof(one)); | |
355 | if (r < 0) | |
356 | return -errno; | |
357 | } | |
623a4c97 LP |
358 | |
359 | if (s->link) { | |
360 | uint32_t ifindex = htobe32(s->link->ifindex); | |
361 | ||
362 | if (sa.sa.sa_family == AF_INET) { | |
363 | r = setsockopt(fd, IPPROTO_IP, IP_UNICAST_IF, &ifindex, sizeof(ifindex)); | |
364 | if (r < 0) | |
365 | return -errno; | |
366 | } else if (sa.sa.sa_family == AF_INET6) { | |
367 | r = setsockopt(fd, IPPROTO_IPV6, IPV6_UNICAST_IF, &ifindex, sizeof(ifindex)); | |
368 | if (r < 0) | |
369 | return -errno; | |
370 | } | |
371 | } | |
372 | ||
373 | if (s->protocol == DNS_PROTOCOL_LLMNR) { | |
bf3f1271 | 374 | /* RFC 4795, section 2.5 requires the TTL to be set to 1 */ |
623a4c97 LP |
375 | |
376 | if (sa.sa.sa_family == AF_INET) { | |
377 | r = setsockopt(fd, IPPROTO_IP, IP_TTL, &one, sizeof(one)); | |
378 | if (r < 0) | |
379 | return -errno; | |
380 | } else if (sa.sa.sa_family == AF_INET6) { | |
381 | r = setsockopt(fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &one, sizeof(one)); | |
382 | if (r < 0) | |
383 | return -errno; | |
384 | } | |
385 | } | |
ad867662 LP |
386 | |
387 | r = connect(fd, &sa.sa, salen); | |
388 | if (r < 0 && errno != EINPROGRESS) | |
389 | return -errno; | |
390 | ||
391 | ret = fd; | |
392 | fd = -1; | |
623a4c97 | 393 | |
ad867662 LP |
394 | return ret; |
395 | } | |
396 | ||
519ef046 LP |
397 | int dns_scope_socket_udp(DnsScope *s, DnsServer *server, uint16_t port) { |
398 | return dns_scope_socket(s, SOCK_DGRAM, AF_UNSPEC, NULL, server, port); | |
0db64366 TG |
399 | } |
400 | ||
519ef046 LP |
401 | int dns_scope_socket_tcp(DnsScope *s, int family, const union in_addr_union *address, DnsServer *server, uint16_t port) { |
402 | return dns_scope_socket(s, SOCK_STREAM, family, address, server, port); | |
0db64366 TG |
403 | } |
404 | ||
51323288 | 405 | DnsScopeMatch dns_scope_good_domain(DnsScope *s, int ifindex, uint64_t flags, const char *domain) { |
a51c1048 | 406 | DnsSearchDomain *d; |
74b2466e LP |
407 | |
408 | assert(s); | |
409 | assert(domain); | |
410 | ||
28b9b764 LP |
411 | /* Checks if the specified domain is something to look up on |
412 | * this scope. Note that this accepts non-qualified hostnames, | |
413 | * i.e. those without any search path prefixed yet. */ | |
414 | ||
51323288 LP |
415 | if (ifindex != 0 && (!s->link || s->link->ifindex != ifindex)) |
416 | return DNS_SCOPE_NO; | |
417 | ||
931851e8 | 418 | if ((SD_RESOLVED_FLAGS_MAKE(s->protocol, s->family, 0) & flags) == 0) |
51323288 LP |
419 | return DNS_SCOPE_NO; |
420 | ||
78c6a153 LP |
421 | /* Never resolve any loopback hostname or IP address via DNS, |
422 | * LLMNR or mDNS. Instead, always rely on synthesized RRs for | |
423 | * these. */ | |
424 | if (is_localhost(domain) || | |
425 | dns_name_endswith(domain, "127.in-addr.arpa") > 0 || | |
9436e8ca LP |
426 | dns_name_equal(domain, "1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.ip6.arpa") > 0) |
427 | return DNS_SCOPE_NO; | |
428 | ||
c9ad0edb LP |
429 | /* Never respond to some of the domains listed in RFC6303 */ |
430 | if (dns_name_endswith(domain, "0.in-addr.arpa") > 0 || | |
431 | dns_name_equal(domain, "255.255.255.255.in-addr.arpa") > 0 || | |
432 | dns_name_equal(domain, "0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.ip6.arpa") > 0) | |
433 | return DNS_SCOPE_NO; | |
434 | ||
7bcffc2e LP |
435 | /* Never respond to some of the domains listed in RFC6761 */ |
436 | if (dns_name_endswith(domain, "invalid") > 0) | |
437 | return DNS_SCOPE_NO; | |
438 | ||
801ad6a6 LP |
439 | /* Always honour search domains for routing queries. Note that |
440 | * we return DNS_SCOPE_YES here, rather than just | |
441 | * DNS_SCOPE_MAYBE, which means wildcard scopes won't be | |
442 | * considered anymore. */ | |
a51c1048 LP |
443 | LIST_FOREACH(domains, d, dns_scope_get_search_domains(s)) |
444 | if (dns_name_endswith(domain, d->name) > 0) | |
9b644bf9 LP |
445 | return DNS_SCOPE_YES; |
446 | ||
106784eb | 447 | switch (s->protocol) { |
801ad6a6 | 448 | |
dc477e73 | 449 | case DNS_PROTOCOL_DNS: |
801ad6a6 | 450 | |
28b9b764 LP |
451 | /* Exclude link-local IP ranges */ |
452 | if (dns_name_endswith(domain, "254.169.in-addr.arpa") == 0 && | |
c9ad0edb LP |
453 | dns_name_endswith(domain, "8.e.f.ip6.arpa") == 0 && |
454 | dns_name_endswith(domain, "9.e.f.ip6.arpa") == 0 && | |
455 | dns_name_endswith(domain, "a.e.f.ip6.arpa") == 0 && | |
b43d96b0 DM |
456 | dns_name_endswith(domain, "b.e.f.ip6.arpa") == 0 && |
457 | /* If networks use .local in their private setups, they are supposed to also add .local to their search | |
458 | * domains, which we already checked above. Otherwise, we consider .local specific to mDNS and won't | |
459 | * send such queries ordinary DNS servers. */ | |
460 | dns_name_endswith(domain, "local") == 0) | |
faa133f3 | 461 | return DNS_SCOPE_MAYBE; |
1716f6dc | 462 | |
faa133f3 | 463 | return DNS_SCOPE_NO; |
1716f6dc | 464 | |
106784eb | 465 | case DNS_PROTOCOL_MDNS: |
78c6a153 LP |
466 | if ((s->family == AF_INET && dns_name_endswith(domain, "in-addr.arpa") > 0) || |
467 | (s->family == AF_INET6 && dns_name_endswith(domain, "ip6.arpa") > 0) || | |
468 | (dns_name_endswith(domain, "local") > 0 && /* only resolve names ending in .local via mDNS */ | |
469 | dns_name_equal(domain, "local") == 0 && /* but not the single-label "local" name itself */ | |
470 | manager_is_own_hostname(s->manager, domain) <= 0)) /* never resolve the local hostname via mDNS */ | |
d8b7e75f | 471 | return DNS_SCOPE_MAYBE; |
74b2466e LP |
472 | |
473 | return DNS_SCOPE_NO; | |
74b2466e | 474 | |
106784eb | 475 | case DNS_PROTOCOL_LLMNR: |
78c6a153 LP |
476 | if ((s->family == AF_INET && dns_name_endswith(domain, "in-addr.arpa") > 0) || |
477 | (s->family == AF_INET6 && dns_name_endswith(domain, "ip6.arpa") > 0) || | |
dc477e73 | 478 | (dns_name_is_single_label(domain) && /* only resolve single label names via LLMNR */ |
78c6a153 LP |
479 | !is_gateway_hostname(domain) && /* don't resolve "gateway" with LLMNR, let nss-myhostname handle this */ |
480 | manager_is_own_hostname(s->manager, domain) <= 0)) /* never resolve the local hostname via LLMNR */ | |
1716f6dc | 481 | return DNS_SCOPE_MAYBE; |
74b2466e | 482 | |
1716f6dc | 483 | return DNS_SCOPE_NO; |
74b2466e | 484 | |
106784eb DM |
485 | default: |
486 | assert_not_reached("Unknown scope protocol"); | |
487 | } | |
1716f6dc LP |
488 | } |
489 | ||
011696f7 LP |
490 | bool dns_scope_good_key(DnsScope *s, const DnsResourceKey *key) { |
491 | int key_family; | |
492 | ||
1716f6dc LP |
493 | assert(s); |
494 | assert(key); | |
495 | ||
28b9b764 LP |
496 | /* Check if it makes sense to resolve the specified key on |
497 | * this scope. Note that this call assumes as fully qualified | |
498 | * name, i.e. the search suffixes already appended. */ | |
499 | ||
011696f7 LP |
500 | if (key->class != DNS_CLASS_IN) |
501 | return false; | |
502 | ||
28b9b764 LP |
503 | if (s->protocol == DNS_PROTOCOL_DNS) { |
504 | ||
e5abebab | 505 | /* On classic DNS, looking up non-address RRs is always |
28b9b764 LP |
506 | * fine. (Specifically, we want to permit looking up |
507 | * DNSKEY and DS records on the root and top-level | |
508 | * domains.) */ | |
509 | if (!dns_resource_key_is_address(key)) | |
510 | return true; | |
511 | ||
512 | /* However, we refuse to look up A and AAAA RRs on the | |
513 | * root and single-label domains, under the assumption | |
514 | * that those should be resolved via LLMNR or search | |
515 | * path only, and should not be leaked onto the | |
516 | * internet. */ | |
517 | return !(dns_name_is_single_label(DNS_RESOURCE_KEY_NAME(key)) || | |
518 | dns_name_is_root(DNS_RESOURCE_KEY_NAME(key))); | |
519 | } | |
1716f6dc LP |
520 | |
521 | /* On mDNS and LLMNR, send A and AAAA queries only on the | |
522 | * respective scopes */ | |
523 | ||
011696f7 LP |
524 | key_family = dns_type_to_af(key->type); |
525 | if (key_family < 0) | |
526 | return true; | |
1716f6dc | 527 | |
011696f7 | 528 | return key_family == s->family; |
1716f6dc LP |
529 | } |
530 | ||
0db4c90a | 531 | static int dns_scope_multicast_membership(DnsScope *s, bool b, struct in_addr in, struct in6_addr in6) { |
1716f6dc LP |
532 | int fd; |
533 | ||
5ba73e9b | 534 | assert(s); |
5ba73e9b LP |
535 | assert(s->link); |
536 | ||
1716f6dc LP |
537 | if (s->family == AF_INET) { |
538 | struct ip_mreqn mreqn = { | |
0db4c90a | 539 | .imr_multiaddr = in, |
1716f6dc LP |
540 | .imr_ifindex = s->link->ifindex, |
541 | }; | |
542 | ||
543 | fd = manager_llmnr_ipv4_udp_fd(s->manager); | |
544 | if (fd < 0) | |
545 | return fd; | |
546 | ||
7b4c2ee7 LP |
547 | /* Always first try to drop membership before we add |
548 | * one. This is necessary on some devices, such as | |
549 | * veth. */ | |
550 | if (b) | |
dc751688 | 551 | (void) setsockopt(fd, IPPROTO_IP, IP_DROP_MEMBERSHIP, &mreqn, sizeof(mreqn)); |
7b4c2ee7 | 552 | |
1716f6dc LP |
553 | if (setsockopt(fd, IPPROTO_IP, b ? IP_ADD_MEMBERSHIP : IP_DROP_MEMBERSHIP, &mreqn, sizeof(mreqn)) < 0) |
554 | return -errno; | |
555 | ||
556 | } else if (s->family == AF_INET6) { | |
557 | struct ipv6_mreq mreq = { | |
0db4c90a | 558 | .ipv6mr_multiaddr = in6, |
1716f6dc LP |
559 | .ipv6mr_interface = s->link->ifindex, |
560 | }; | |
561 | ||
562 | fd = manager_llmnr_ipv6_udp_fd(s->manager); | |
563 | if (fd < 0) | |
564 | return fd; | |
565 | ||
7b4c2ee7 | 566 | if (b) |
dc751688 | 567 | (void) setsockopt(fd, IPPROTO_IPV6, IPV6_DROP_MEMBERSHIP, &mreq, sizeof(mreq)); |
7b4c2ee7 | 568 | |
1716f6dc LP |
569 | if (setsockopt(fd, IPPROTO_IPV6, b ? IPV6_ADD_MEMBERSHIP : IPV6_DROP_MEMBERSHIP, &mreq, sizeof(mreq)) < 0) |
570 | return -errno; | |
571 | } else | |
572 | return -EAFNOSUPPORT; | |
573 | ||
574 | return 0; | |
74b2466e | 575 | } |
623a4c97 | 576 | |
0db4c90a DM |
577 | int dns_scope_llmnr_membership(DnsScope *s, bool b) { |
578 | ||
579 | if (s->protocol != DNS_PROTOCOL_LLMNR) | |
580 | return 0; | |
581 | ||
582 | return dns_scope_multicast_membership(s, b, LLMNR_MULTICAST_IPV4_ADDRESS, LLMNR_MULTICAST_IPV6_ADDRESS); | |
583 | } | |
584 | ||
585 | int dns_scope_mdns_membership(DnsScope *s, bool b) { | |
586 | ||
587 | if (s->protocol != DNS_PROTOCOL_MDNS) | |
588 | return 0; | |
589 | ||
590 | return dns_scope_multicast_membership(s, b, MDNS_MULTICAST_IPV4_ADDRESS, MDNS_MULTICAST_IPV6_ADDRESS); | |
591 | } | |
592 | ||
ec2c5e43 LP |
593 | static int dns_scope_make_reply_packet( |
594 | DnsScope *s, | |
595 | uint16_t id, | |
596 | int rcode, | |
597 | DnsQuestion *q, | |
598 | DnsAnswer *answer, | |
599 | DnsAnswer *soa, | |
600 | bool tentative, | |
601 | DnsPacket **ret) { | |
602 | ||
623a4c97 LP |
603 | _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL; |
604 | unsigned i; | |
605 | int r; | |
606 | ||
607 | assert(s); | |
a4076574 | 608 | assert(ret); |
623a4c97 | 609 | |
75cd513e TA |
610 | if ((!q || q->n_keys <= 0) |
611 | && (!answer || answer->n_rrs <= 0) | |
612 | && (!soa || soa->n_rrs <= 0)) | |
623a4c97 LP |
613 | return -EINVAL; |
614 | ||
615 | r = dns_packet_new(&p, s->protocol, 0); | |
616 | if (r < 0) | |
617 | return r; | |
618 | ||
619 | DNS_PACKET_HEADER(p)->id = id; | |
ea917db9 LP |
620 | DNS_PACKET_HEADER(p)->flags = htobe16(DNS_PACKET_MAKE_FLAGS( |
621 | 1 /* qr */, | |
622 | 0 /* opcode */, | |
623 | 0 /* c */, | |
624 | 0 /* tc */, | |
ec2c5e43 | 625 | tentative, |
ea917db9 LP |
626 | 0 /* (ra) */, |
627 | 0 /* (ad) */, | |
628 | 0 /* (cd) */, | |
629 | rcode)); | |
623a4c97 LP |
630 | |
631 | if (q) { | |
632 | for (i = 0; i < q->n_keys; i++) { | |
633 | r = dns_packet_append_key(p, q->keys[i], NULL); | |
634 | if (r < 0) | |
635 | return r; | |
636 | } | |
637 | ||
638 | DNS_PACKET_HEADER(p)->qdcount = htobe16(q->n_keys); | |
639 | } | |
640 | ||
8bf52d3d LP |
641 | if (answer) { |
642 | for (i = 0; i < answer->n_rrs; i++) { | |
a8812dd7 | 643 | r = dns_packet_append_rr(p, answer->items[i].rr, NULL, NULL); |
623a4c97 LP |
644 | if (r < 0) |
645 | return r; | |
646 | } | |
647 | ||
8bf52d3d LP |
648 | DNS_PACKET_HEADER(p)->ancount = htobe16(answer->n_rrs); |
649 | } | |
650 | ||
651 | if (soa) { | |
652 | for (i = 0; i < soa->n_rrs; i++) { | |
a8812dd7 | 653 | r = dns_packet_append_rr(p, soa->items[i].rr, NULL, NULL); |
8bf52d3d LP |
654 | if (r < 0) |
655 | return r; | |
656 | } | |
657 | ||
658 | DNS_PACKET_HEADER(p)->arcount = htobe16(soa->n_rrs); | |
623a4c97 LP |
659 | } |
660 | ||
661 | *ret = p; | |
662 | p = NULL; | |
663 | ||
664 | return 0; | |
665 | } | |
666 | ||
a4076574 LP |
667 | static void dns_scope_verify_conflicts(DnsScope *s, DnsPacket *p) { |
668 | unsigned n; | |
669 | ||
670 | assert(s); | |
671 | assert(p); | |
672 | ||
673 | if (p->question) | |
674 | for (n = 0; n < p->question->n_keys; n++) | |
675 | dns_zone_verify_conflicts(&s->zone, p->question->keys[n]); | |
676 | if (p->answer) | |
677 | for (n = 0; n < p->answer->n_rrs; n++) | |
78c6a153 | 678 | dns_zone_verify_conflicts(&s->zone, p->answer->items[n].rr->key); |
a4076574 LP |
679 | } |
680 | ||
623a4c97 LP |
681 | void dns_scope_process_query(DnsScope *s, DnsStream *stream, DnsPacket *p) { |
682 | _cleanup_(dns_packet_unrefp) DnsPacket *reply = NULL; | |
8bf52d3d | 683 | _cleanup_(dns_answer_unrefp) DnsAnswer *answer = NULL, *soa = NULL; |
5032b16d | 684 | DnsResourceKey *key = NULL; |
ec2c5e43 | 685 | bool tentative = false; |
623a4c97 LP |
686 | int r, fd; |
687 | ||
688 | assert(s); | |
689 | assert(p); | |
690 | ||
691 | if (p->protocol != DNS_PROTOCOL_LLMNR) | |
692 | return; | |
693 | ||
2442b93d LP |
694 | if (p->ipproto == IPPROTO_UDP) { |
695 | /* Don't accept UDP queries directed to anything but | |
696 | * the LLMNR multicast addresses. See RFC 4795, | |
d076c6f9 | 697 | * section 2.5. */ |
2442b93d LP |
698 | |
699 | if (p->family == AF_INET && !in_addr_equal(AF_INET, &p->destination, (union in_addr_union*) &LLMNR_MULTICAST_IPV4_ADDRESS)) | |
700 | return; | |
701 | ||
702 | if (p->family == AF_INET6 && !in_addr_equal(AF_INET6, &p->destination, (union in_addr_union*) &LLMNR_MULTICAST_IPV6_ADDRESS)) | |
703 | return; | |
704 | } | |
705 | ||
623a4c97 LP |
706 | r = dns_packet_extract(p); |
707 | if (r < 0) { | |
da927ba9 | 708 | log_debug_errno(r, "Failed to extract resources from incoming packet: %m"); |
623a4c97 LP |
709 | return; |
710 | } | |
711 | ||
8b757a38 | 712 | if (DNS_PACKET_LLMNR_C(p)) { |
a4076574 LP |
713 | /* Somebody notified us about a possible conflict */ |
714 | dns_scope_verify_conflicts(s, p); | |
ea917db9 LP |
715 | return; |
716 | } | |
717 | ||
5032b16d LP |
718 | assert(p->question->n_keys == 1); |
719 | key = p->question->keys[0]; | |
720 | ||
721 | r = dns_zone_lookup(&s->zone, key, &answer, &soa, &tentative); | |
623a4c97 | 722 | if (r < 0) { |
da927ba9 | 723 | log_debug_errno(r, "Failed to lookup key: %m"); |
623a4c97 LP |
724 | return; |
725 | } | |
726 | if (r == 0) | |
727 | return; | |
728 | ||
fcf57f9c LP |
729 | if (answer) |
730 | dns_answer_order_by_scope(answer, in_addr_is_link_local(p->family, &p->sender) > 0); | |
af93291c | 731 | |
ec2c5e43 | 732 | r = dns_scope_make_reply_packet(s, DNS_PACKET_ID(p), DNS_RCODE_SUCCESS, p->question, answer, soa, tentative, &reply); |
623a4c97 | 733 | if (r < 0) { |
da927ba9 | 734 | log_debug_errno(r, "Failed to build reply packet: %m"); |
623a4c97 LP |
735 | return; |
736 | } | |
737 | ||
738 | if (stream) | |
739 | r = dns_stream_write_packet(stream, reply); | |
740 | else { | |
aea2429d LP |
741 | if (!ratelimit_test(&s->ratelimit)) |
742 | return; | |
743 | ||
623a4c97 LP |
744 | if (p->family == AF_INET) |
745 | fd = manager_llmnr_ipv4_udp_fd(s->manager); | |
746 | else if (p->family == AF_INET6) | |
747 | fd = manager_llmnr_ipv6_udp_fd(s->manager); | |
748 | else { | |
749 | log_debug("Unknown protocol"); | |
750 | return; | |
751 | } | |
752 | if (fd < 0) { | |
da927ba9 | 753 | log_debug_errno(fd, "Failed to get reply socket: %m"); |
623a4c97 LP |
754 | return; |
755 | } | |
756 | ||
6e068472 LP |
757 | /* Note that we always immediately reply to all LLMNR |
758 | * requests, and do not wait any time, since we | |
759 | * verified uniqueness for all records. Also see RFC | |
760 | * 4795, Section 2.7 */ | |
761 | ||
623a4c97 LP |
762 | r = manager_send(s->manager, fd, p->ifindex, p->family, &p->sender, p->sender_port, reply); |
763 | } | |
764 | ||
765 | if (r < 0) { | |
da927ba9 | 766 | log_debug_errno(r, "Failed to send reply packet: %m"); |
623a4c97 LP |
767 | return; |
768 | } | |
769 | } | |
ec2c5e43 | 770 | |
f52e61da | 771 | DnsTransaction *dns_scope_find_transaction(DnsScope *scope, DnsResourceKey *key, bool cache_ok) { |
ec2c5e43 LP |
772 | DnsTransaction *t; |
773 | ||
774 | assert(scope); | |
f52e61da | 775 | assert(key); |
ec2c5e43 | 776 | |
da0c630e LP |
777 | /* Try to find an ongoing transaction that is a equal to the |
778 | * specified question */ | |
f9ebb22a | 779 | t = hashmap_get(scope->transactions_by_key, key); |
da0c630e LP |
780 | if (!t) |
781 | return NULL; | |
dc4d47e2 | 782 | |
da0c630e LP |
783 | /* Refuse reusing transactions that completed based on cached |
784 | * data instead of a real packet, if that's requested. */ | |
785 | if (!cache_ok && | |
3bbdc31d | 786 | IN_SET(t->state, DNS_TRANSACTION_SUCCESS, DNS_TRANSACTION_RCODE_FAILURE) && |
c3bc53e6 | 787 | t->answer_source != DNS_TRANSACTION_NETWORK) |
da0c630e | 788 | return NULL; |
ec2c5e43 | 789 | |
da0c630e | 790 | return t; |
ec2c5e43 | 791 | } |
a4076574 LP |
792 | |
793 | static int dns_scope_make_conflict_packet( | |
794 | DnsScope *s, | |
795 | DnsResourceRecord *rr, | |
796 | DnsPacket **ret) { | |
797 | ||
798 | _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL; | |
799 | int r; | |
800 | ||
801 | assert(s); | |
802 | assert(rr); | |
803 | assert(ret); | |
804 | ||
805 | r = dns_packet_new(&p, s->protocol, 0); | |
806 | if (r < 0) | |
807 | return r; | |
808 | ||
809 | DNS_PACKET_HEADER(p)->flags = htobe16(DNS_PACKET_MAKE_FLAGS( | |
810 | 0 /* qr */, | |
811 | 0 /* opcode */, | |
812 | 1 /* conflict */, | |
813 | 0 /* tc */, | |
814 | 0 /* t */, | |
815 | 0 /* (ra) */, | |
816 | 0 /* (ad) */, | |
817 | 0 /* (cd) */, | |
818 | 0)); | |
fe2dfc8b DM |
819 | |
820 | /* For mDNS, the transaction ID should always be 0 */ | |
821 | if (s->protocol != DNS_PROTOCOL_MDNS) | |
822 | random_bytes(&DNS_PACKET_HEADER(p)->id, sizeof(uint16_t)); | |
823 | ||
a4076574 LP |
824 | DNS_PACKET_HEADER(p)->qdcount = htobe16(1); |
825 | DNS_PACKET_HEADER(p)->arcount = htobe16(1); | |
826 | ||
827 | r = dns_packet_append_key(p, rr->key, NULL); | |
828 | if (r < 0) | |
829 | return r; | |
830 | ||
a8812dd7 | 831 | r = dns_packet_append_rr(p, rr, NULL, NULL); |
a4076574 LP |
832 | if (r < 0) |
833 | return r; | |
834 | ||
835 | *ret = p; | |
836 | p = NULL; | |
837 | ||
838 | return 0; | |
839 | } | |
840 | ||
841 | static int on_conflict_dispatch(sd_event_source *es, usec_t usec, void *userdata) { | |
842 | DnsScope *scope = userdata; | |
843 | int r; | |
844 | ||
845 | assert(es); | |
846 | assert(scope); | |
847 | ||
848 | scope->conflict_event_source = sd_event_source_unref(scope->conflict_event_source); | |
849 | ||
850 | for (;;) { | |
851 | _cleanup_(dns_resource_record_unrefp) DnsResourceRecord *rr = NULL; | |
852 | _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL; | |
853 | ||
1e43061b | 854 | rr = ordered_hashmap_steal_first(scope->conflict_queue); |
a4076574 LP |
855 | if (!rr) |
856 | break; | |
857 | ||
858 | r = dns_scope_make_conflict_packet(scope, rr, &p); | |
859 | if (r < 0) { | |
da927ba9 | 860 | log_error_errno(r, "Failed to make conflict packet: %m"); |
a4076574 LP |
861 | return 0; |
862 | } | |
863 | ||
519ef046 | 864 | r = dns_scope_emit_udp(scope, -1, p); |
a4076574 | 865 | if (r < 0) |
da927ba9 | 866 | log_debug_errno(r, "Failed to send conflict packet: %m"); |
a4076574 LP |
867 | } |
868 | ||
869 | return 0; | |
870 | } | |
871 | ||
872 | int dns_scope_notify_conflict(DnsScope *scope, DnsResourceRecord *rr) { | |
873 | usec_t jitter; | |
874 | int r; | |
875 | ||
876 | assert(scope); | |
877 | assert(rr); | |
878 | ||
879 | /* We don't send these queries immediately. Instead, we queue | |
880 | * them, and send them after some jitter delay. */ | |
1e43061b | 881 | r = ordered_hashmap_ensure_allocated(&scope->conflict_queue, &dns_resource_key_hash_ops); |
a4076574 LP |
882 | if (r < 0) { |
883 | log_oom(); | |
884 | return r; | |
885 | } | |
886 | ||
887 | /* We only place one RR per key in the conflict | |
888 | * messages, not all of them. That should be enough to | |
889 | * indicate where there might be a conflict */ | |
1e43061b | 890 | r = ordered_hashmap_put(scope->conflict_queue, rr->key, rr); |
a4076574 LP |
891 | if (r == -EEXIST || r == 0) |
892 | return 0; | |
f647962d MS |
893 | if (r < 0) |
894 | return log_debug_errno(r, "Failed to queue conflicting RR: %m"); | |
a4076574 LP |
895 | |
896 | dns_resource_record_ref(rr); | |
897 | ||
898 | if (scope->conflict_event_source) | |
899 | return 0; | |
900 | ||
901 | random_bytes(&jitter, sizeof(jitter)); | |
902 | jitter %= LLMNR_JITTER_INTERVAL_USEC; | |
903 | ||
904 | r = sd_event_add_time(scope->manager->event, | |
905 | &scope->conflict_event_source, | |
906 | clock_boottime_or_monotonic(), | |
907 | now(clock_boottime_or_monotonic()) + jitter, | |
908 | LLMNR_JITTER_INTERVAL_USEC, | |
909 | on_conflict_dispatch, scope); | |
f647962d MS |
910 | if (r < 0) |
911 | return log_debug_errno(r, "Failed to add conflict dispatch event: %m"); | |
a4076574 | 912 | |
aa4a9deb LP |
913 | (void) sd_event_source_set_description(scope->conflict_event_source, "scope-conflict"); |
914 | ||
a4076574 LP |
915 | return 0; |
916 | } | |
917 | ||
918 | void dns_scope_check_conflicts(DnsScope *scope, DnsPacket *p) { | |
919 | unsigned i; | |
920 | int r; | |
921 | ||
922 | assert(scope); | |
923 | assert(p); | |
924 | ||
925 | if (p->protocol != DNS_PROTOCOL_LLMNR) | |
926 | return; | |
927 | ||
928 | if (DNS_PACKET_RRCOUNT(p) <= 0) | |
929 | return; | |
930 | ||
8b757a38 | 931 | if (DNS_PACKET_LLMNR_C(p) != 0) |
a4076574 LP |
932 | return; |
933 | ||
8b757a38 | 934 | if (DNS_PACKET_LLMNR_T(p) != 0) |
a4076574 LP |
935 | return; |
936 | ||
937 | if (manager_our_packet(scope->manager, p)) | |
938 | return; | |
939 | ||
940 | r = dns_packet_extract(p); | |
941 | if (r < 0) { | |
da927ba9 | 942 | log_debug_errno(r, "Failed to extract packet: %m"); |
a4076574 LP |
943 | return; |
944 | } | |
945 | ||
946 | log_debug("Checking for conflicts..."); | |
947 | ||
948 | for (i = 0; i < p->answer->n_rrs; i++) { | |
949 | ||
950 | /* Check for conflicts against the local zone. If we | |
951 | * found one, we won't check any further */ | |
78c6a153 | 952 | r = dns_zone_check_conflicts(&scope->zone, p->answer->items[i].rr); |
a4076574 LP |
953 | if (r != 0) |
954 | continue; | |
955 | ||
956 | /* Check for conflicts against the local cache. If so, | |
957 | * send out an advisory query, to inform everybody */ | |
78c6a153 | 958 | r = dns_cache_check_conflicts(&scope->cache, p->answer->items[i].rr, p->family, &p->sender); |
a4076574 LP |
959 | if (r <= 0) |
960 | continue; | |
961 | ||
78c6a153 | 962 | dns_scope_notify_conflict(scope, p->answer->items[i].rr); |
a4076574 LP |
963 | } |
964 | } | |
4d506d6b LP |
965 | |
966 | void dns_scope_dump(DnsScope *s, FILE *f) { | |
967 | assert(s); | |
968 | ||
969 | if (!f) | |
970 | f = stdout; | |
971 | ||
972 | fputs("[Scope protocol=", f); | |
973 | fputs(dns_protocol_to_string(s->protocol), f); | |
974 | ||
975 | if (s->link) { | |
976 | fputs(" interface=", f); | |
977 | fputs(s->link->name, f); | |
978 | } | |
979 | ||
980 | if (s->family != AF_UNSPEC) { | |
981 | fputs(" family=", f); | |
982 | fputs(af_to_name(s->family), f); | |
983 | } | |
984 | ||
985 | fputs("]\n", f); | |
986 | ||
987 | if (!dns_zone_is_empty(&s->zone)) { | |
988 | fputs("ZONE:\n", f); | |
989 | dns_zone_dump(&s->zone, f); | |
990 | } | |
991 | ||
992 | if (!dns_cache_is_empty(&s->cache)) { | |
993 | fputs("CACHE:\n", f); | |
994 | dns_cache_dump(&s->cache, f); | |
995 | } | |
996 | } | |
a51c1048 LP |
997 | |
998 | DnsSearchDomain *dns_scope_get_search_domains(DnsScope *s) { | |
801ad6a6 LP |
999 | assert(s); |
1000 | ||
a51c1048 LP |
1001 | if (s->protocol != DNS_PROTOCOL_DNS) |
1002 | return NULL; | |
1003 | ||
1004 | if (s->link) | |
1005 | return s->link->search_domains; | |
1006 | ||
28b9b764 | 1007 | return s->manager->search_domains; |
801ad6a6 LP |
1008 | } |
1009 | ||
dc477e73 | 1010 | bool dns_scope_name_needs_search_domain(DnsScope *s, const char *name) { |
801ad6a6 LP |
1011 | assert(s); |
1012 | ||
1013 | if (s->protocol != DNS_PROTOCOL_DNS) | |
dc477e73 | 1014 | return false; |
801ad6a6 | 1015 | |
dc477e73 | 1016 | return dns_name_is_single_label(name); |
801ad6a6 | 1017 | } |
edbcc1fd LP |
1018 | |
1019 | bool dns_scope_network_good(DnsScope *s) { | |
edbcc1fd LP |
1020 | /* Checks whether the network is in good state for lookups on this scope. For mDNS/LLMNR/Classic DNS scopes |
1021 | * bound to links this is easy, as they don't even exist if the link isn't in a suitable state. For the global | |
1022 | * DNS scope we check whether there are any links that are up and have an address. */ | |
1023 | ||
1024 | if (s->link) | |
1025 | return true; | |
1026 | ||
011696f7 | 1027 | return manager_routable(s->manager, AF_UNSPEC); |
edbcc1fd | 1028 | } |