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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); |
6b430fdb | 131 | return mfree(s); |
74b2466e LP |
132 | } |
133 | ||
2c27fbca | 134 | DnsServer *dns_scope_get_dns_server(DnsScope *s) { |
74b2466e LP |
135 | assert(s); |
136 | ||
1716f6dc LP |
137 | if (s->protocol != DNS_PROTOCOL_DNS) |
138 | return NULL; | |
139 | ||
74b2466e LP |
140 | if (s->link) |
141 | return link_get_dns_server(s->link); | |
142 | else | |
143 | return manager_get_dns_server(s->manager); | |
144 | } | |
145 | ||
146 | void dns_scope_next_dns_server(DnsScope *s) { | |
147 | assert(s); | |
148 | ||
1716f6dc LP |
149 | if (s->protocol != DNS_PROTOCOL_DNS) |
150 | return; | |
151 | ||
74b2466e LP |
152 | if (s->link) |
153 | link_next_dns_server(s->link); | |
154 | else | |
155 | manager_next_dns_server(s->manager); | |
156 | } | |
157 | ||
9df3ba6c TG |
158 | void dns_scope_packet_received(DnsScope *s, usec_t rtt) { |
159 | assert(s); | |
160 | ||
84129d46 LP |
161 | if (rtt <= s->max_rtt) |
162 | return; | |
163 | ||
164 | s->max_rtt = rtt; | |
165 | s->resend_timeout = MIN(MAX(MULTICAST_RESEND_TIMEOUT_MIN_USEC, s->max_rtt * 2), MULTICAST_RESEND_TIMEOUT_MAX_USEC); | |
9df3ba6c TG |
166 | } |
167 | ||
168 | void dns_scope_packet_lost(DnsScope *s, usec_t usec) { | |
169 | assert(s); | |
170 | ||
171 | if (s->resend_timeout <= usec) | |
172 | s->resend_timeout = MIN(s->resend_timeout * 2, MULTICAST_RESEND_TIMEOUT_MAX_USEC); | |
173 | } | |
174 | ||
519ef046 | 175 | static int dns_scope_emit_one(DnsScope *s, int fd, DnsPacket *p) { |
1716f6dc LP |
176 | union in_addr_union addr; |
177 | int ifindex = 0, r; | |
0dd25fb9 | 178 | int family; |
1716f6dc | 179 | uint32_t mtu; |
74b2466e LP |
180 | |
181 | assert(s); | |
182 | assert(p); | |
1716f6dc | 183 | assert(p->protocol == s->protocol); |
ad867662 LP |
184 | |
185 | if (s->link) { | |
1716f6dc | 186 | mtu = s->link->mtu; |
74b2466e | 187 | ifindex = s->link->ifindex; |
1716f6dc | 188 | } else |
e1c95994 | 189 | mtu = manager_find_mtu(s->manager); |
74b2466e | 190 | |
106784eb | 191 | switch (s->protocol) { |
519ef046 | 192 | |
106784eb | 193 | case DNS_PROTOCOL_DNS: |
519ef046 | 194 | assert(fd >= 0); |
9c5e12a4 | 195 | |
623a4c97 | 196 | if (DNS_PACKET_QDCOUNT(p) > 1) |
15411c0c | 197 | return -EOPNOTSUPP; |
623a4c97 | 198 | |
1716f6dc LP |
199 | if (p->size > DNS_PACKET_UNICAST_SIZE_MAX) |
200 | return -EMSGSIZE; | |
201 | ||
a0166609 | 202 | if (p->size + UDP_PACKET_HEADER_SIZE > mtu) |
1716f6dc LP |
203 | return -EMSGSIZE; |
204 | ||
72290734 TG |
205 | r = manager_write(s->manager, fd, p); |
206 | if (r < 0) | |
207 | return r; | |
208 | ||
106784eb | 209 | break; |
1716f6dc | 210 | |
106784eb | 211 | case DNS_PROTOCOL_LLMNR: |
519ef046 LP |
212 | assert(fd < 0); |
213 | ||
1716f6dc | 214 | if (DNS_PACKET_QDCOUNT(p) > 1) |
15411c0c | 215 | return -EOPNOTSUPP; |
1716f6dc | 216 | |
aea2429d LP |
217 | if (!ratelimit_test(&s->ratelimit)) |
218 | return -EBUSY; | |
219 | ||
1716f6dc | 220 | family = s->family; |
1716f6dc LP |
221 | |
222 | if (family == AF_INET) { | |
223 | addr.in = LLMNR_MULTICAST_IPV4_ADDRESS; | |
1716f6dc LP |
224 | fd = manager_llmnr_ipv4_udp_fd(s->manager); |
225 | } else if (family == AF_INET6) { | |
226 | addr.in6 = LLMNR_MULTICAST_IPV6_ADDRESS; | |
227 | fd = manager_llmnr_ipv6_udp_fd(s->manager); | |
1716f6dc LP |
228 | } else |
229 | return -EAFNOSUPPORT; | |
230 | if (fd < 0) | |
231 | return fd; | |
72290734 | 232 | |
b30bf55d | 233 | r = manager_send(s->manager, fd, ifindex, family, &addr, LLMNR_PORT, NULL, p); |
b4f1862d DM |
234 | if (r < 0) |
235 | return r; | |
236 | ||
237 | break; | |
238 | ||
239 | case DNS_PROTOCOL_MDNS: | |
519ef046 LP |
240 | assert(fd < 0); |
241 | ||
b4f1862d DM |
242 | if (!ratelimit_test(&s->ratelimit)) |
243 | return -EBUSY; | |
244 | ||
245 | family = s->family; | |
246 | ||
247 | if (family == AF_INET) { | |
248 | addr.in = MDNS_MULTICAST_IPV4_ADDRESS; | |
249 | fd = manager_mdns_ipv4_fd(s->manager); | |
250 | } else if (family == AF_INET6) { | |
251 | addr.in6 = MDNS_MULTICAST_IPV6_ADDRESS; | |
252 | fd = manager_mdns_ipv6_fd(s->manager); | |
253 | } else | |
254 | return -EAFNOSUPPORT; | |
255 | if (fd < 0) | |
256 | return fd; | |
257 | ||
b30bf55d | 258 | r = manager_send(s->manager, fd, ifindex, family, &addr, MDNS_PORT, NULL, p); |
72290734 TG |
259 | if (r < 0) |
260 | return r; | |
106784eb DM |
261 | |
262 | break; | |
263 | ||
264 | default: | |
74b2466e | 265 | return -EAFNOSUPPORT; |
106784eb | 266 | } |
74b2466e | 267 | |
74b2466e LP |
268 | return 1; |
269 | } | |
270 | ||
519ef046 | 271 | int dns_scope_emit_udp(DnsScope *s, int fd, DnsPacket *p) { |
80a62095 DM |
272 | int r; |
273 | ||
274 | assert(s); | |
275 | assert(p); | |
276 | assert(p->protocol == s->protocol); | |
519ef046 | 277 | assert((s->protocol == DNS_PROTOCOL_DNS) == (fd >= 0)); |
80a62095 DM |
278 | |
279 | do { | |
280 | /* If there are multiple linked packets, set the TC bit in all but the last of them */ | |
281 | if (p->more) { | |
282 | assert(p->protocol == DNS_PROTOCOL_MDNS); | |
261f3673 | 283 | dns_packet_set_flags(p, true, true); |
80a62095 DM |
284 | } |
285 | ||
519ef046 | 286 | r = dns_scope_emit_one(s, fd, p); |
80a62095 DM |
287 | if (r < 0) |
288 | return r; | |
289 | ||
290 | p = p->more; | |
519ef046 | 291 | } while (p); |
80a62095 DM |
292 | |
293 | return 0; | |
294 | } | |
295 | ||
519ef046 LP |
296 | static int dns_scope_socket( |
297 | DnsScope *s, | |
298 | int type, | |
299 | int family, | |
300 | const union in_addr_union *address, | |
301 | DnsServer *server, | |
302 | uint16_t port) { | |
303 | ||
ad867662 LP |
304 | _cleanup_close_ int fd = -1; |
305 | union sockaddr_union sa = {}; | |
306 | socklen_t salen; | |
623a4c97 | 307 | static const int one = 1; |
2817157b | 308 | int ret, r, ifindex; |
ad867662 LP |
309 | |
310 | assert(s); | |
be808ea0 | 311 | |
519ef046 LP |
312 | if (server) { |
313 | assert(family == AF_UNSPEC); | |
314 | assert(!address); | |
be808ea0 | 315 | |
2817157b LP |
316 | ifindex = dns_server_ifindex(server); |
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; |
2817157b | 326 | sa.in6.sin6_scope_id = ifindex; |
623a4c97 LP |
327 | salen = sizeof(sa.in6); |
328 | } else | |
329 | return -EAFNOSUPPORT; | |
330 | } else { | |
519ef046 LP |
331 | assert(family != AF_UNSPEC); |
332 | assert(address); | |
333 | ||
623a4c97 | 334 | sa.sa.sa_family = family; |
2817157b | 335 | ifindex = s->link ? s->link->ifindex : 0; |
623a4c97 LP |
336 | |
337 | if (family == AF_INET) { | |
338 | sa.in.sin_port = htobe16(port); | |
339 | sa.in.sin_addr = address->in; | |
340 | salen = sizeof(sa.in); | |
341 | } else if (family == AF_INET6) { | |
342 | sa.in6.sin6_port = htobe16(port); | |
343 | sa.in6.sin6_addr = address->in6; | |
2817157b | 344 | sa.in6.sin6_scope_id = ifindex; |
623a4c97 LP |
345 | salen = sizeof(sa.in6); |
346 | } else | |
347 | return -EAFNOSUPPORT; | |
348 | } | |
ad867662 | 349 | |
0db64366 | 350 | fd = socket(sa.sa.sa_family, type|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); |
ad867662 LP |
351 | if (fd < 0) |
352 | return -errno; | |
353 | ||
0db64366 TG |
354 | if (type == SOCK_STREAM) { |
355 | r = setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &one, sizeof(one)); | |
356 | if (r < 0) | |
357 | return -errno; | |
358 | } | |
623a4c97 LP |
359 | |
360 | if (s->link) { | |
2817157b | 361 | be32_t ifindex_be = htobe32(ifindex); |
623a4c97 LP |
362 | |
363 | if (sa.sa.sa_family == AF_INET) { | |
2817157b | 364 | r = setsockopt(fd, IPPROTO_IP, IP_UNICAST_IF, &ifindex_be, sizeof(ifindex_be)); |
623a4c97 LP |
365 | if (r < 0) |
366 | return -errno; | |
367 | } else if (sa.sa.sa_family == AF_INET6) { | |
2817157b | 368 | r = setsockopt(fd, IPPROTO_IPV6, IPV6_UNICAST_IF, &ifindex_be, sizeof(ifindex_be)); |
623a4c97 LP |
369 | if (r < 0) |
370 | return -errno; | |
371 | } | |
372 | } | |
373 | ||
374 | if (s->protocol == DNS_PROTOCOL_LLMNR) { | |
bf3f1271 | 375 | /* RFC 4795, section 2.5 requires the TTL to be set to 1 */ |
623a4c97 LP |
376 | |
377 | if (sa.sa.sa_family == AF_INET) { | |
378 | r = setsockopt(fd, IPPROTO_IP, IP_TTL, &one, sizeof(one)); | |
379 | if (r < 0) | |
380 | return -errno; | |
381 | } else if (sa.sa.sa_family == AF_INET6) { | |
382 | r = setsockopt(fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &one, sizeof(one)); | |
383 | if (r < 0) | |
384 | return -errno; | |
385 | } | |
386 | } | |
ad867662 LP |
387 | |
388 | r = connect(fd, &sa.sa, salen); | |
389 | if (r < 0 && errno != EINPROGRESS) | |
390 | return -errno; | |
391 | ||
392 | ret = fd; | |
393 | fd = -1; | |
623a4c97 | 394 | |
ad867662 LP |
395 | return ret; |
396 | } | |
397 | ||
519ef046 LP |
398 | int dns_scope_socket_udp(DnsScope *s, DnsServer *server, uint16_t port) { |
399 | return dns_scope_socket(s, SOCK_DGRAM, AF_UNSPEC, NULL, server, port); | |
0db64366 TG |
400 | } |
401 | ||
519ef046 LP |
402 | int dns_scope_socket_tcp(DnsScope *s, int family, const union in_addr_union *address, DnsServer *server, uint16_t port) { |
403 | return dns_scope_socket(s, SOCK_STREAM, family, address, server, port); | |
0db64366 TG |
404 | } |
405 | ||
51323288 | 406 | DnsScopeMatch dns_scope_good_domain(DnsScope *s, int ifindex, uint64_t flags, const char *domain) { |
a51c1048 | 407 | DnsSearchDomain *d; |
b9fe94ca | 408 | DnsServer *dns_server; |
74b2466e LP |
409 | |
410 | assert(s); | |
411 | assert(domain); | |
412 | ||
28b9b764 LP |
413 | /* Checks if the specified domain is something to look up on |
414 | * this scope. Note that this accepts non-qualified hostnames, | |
415 | * i.e. those without any search path prefixed yet. */ | |
416 | ||
51323288 LP |
417 | if (ifindex != 0 && (!s->link || s->link->ifindex != ifindex)) |
418 | return DNS_SCOPE_NO; | |
419 | ||
931851e8 | 420 | if ((SD_RESOLVED_FLAGS_MAKE(s->protocol, s->family, 0) & flags) == 0) |
51323288 LP |
421 | return DNS_SCOPE_NO; |
422 | ||
78c6a153 LP |
423 | /* Never resolve any loopback hostname or IP address via DNS, |
424 | * LLMNR or mDNS. Instead, always rely on synthesized RRs for | |
425 | * these. */ | |
426 | if (is_localhost(domain) || | |
427 | dns_name_endswith(domain, "127.in-addr.arpa") > 0 || | |
9436e8ca LP |
428 | 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) |
429 | return DNS_SCOPE_NO; | |
430 | ||
c9ad0edb LP |
431 | /* Never respond to some of the domains listed in RFC6303 */ |
432 | if (dns_name_endswith(domain, "0.in-addr.arpa") > 0 || | |
433 | dns_name_equal(domain, "255.255.255.255.in-addr.arpa") > 0 || | |
434 | 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) | |
435 | return DNS_SCOPE_NO; | |
436 | ||
7bcffc2e LP |
437 | /* Never respond to some of the domains listed in RFC6761 */ |
438 | if (dns_name_endswith(domain, "invalid") > 0) | |
439 | return DNS_SCOPE_NO; | |
440 | ||
801ad6a6 LP |
441 | /* Always honour search domains for routing queries. Note that |
442 | * we return DNS_SCOPE_YES here, rather than just | |
443 | * DNS_SCOPE_MAYBE, which means wildcard scopes won't be | |
444 | * considered anymore. */ | |
a51c1048 LP |
445 | LIST_FOREACH(domains, d, dns_scope_get_search_domains(s)) |
446 | if (dns_name_endswith(domain, d->name) > 0) | |
9b644bf9 LP |
447 | return DNS_SCOPE_YES; |
448 | ||
b9fe94ca MP |
449 | /* If the DNS server has route-only domains, don't send other requests |
450 | * to it. This would be a privacy violation, will most probably fail | |
451 | * anyway, and adds unnecessary load. */ | |
452 | dns_server = dns_scope_get_dns_server(s); | |
453 | if (dns_server && dns_server_limited_domains(dns_server)) | |
454 | return DNS_SCOPE_NO; | |
455 | ||
106784eb | 456 | switch (s->protocol) { |
801ad6a6 | 457 | |
dc477e73 | 458 | case DNS_PROTOCOL_DNS: |
801ad6a6 | 459 | |
28b9b764 LP |
460 | /* Exclude link-local IP ranges */ |
461 | if (dns_name_endswith(domain, "254.169.in-addr.arpa") == 0 && | |
c9ad0edb LP |
462 | dns_name_endswith(domain, "8.e.f.ip6.arpa") == 0 && |
463 | dns_name_endswith(domain, "9.e.f.ip6.arpa") == 0 && | |
464 | dns_name_endswith(domain, "a.e.f.ip6.arpa") == 0 && | |
b43d96b0 DM |
465 | dns_name_endswith(domain, "b.e.f.ip6.arpa") == 0 && |
466 | /* If networks use .local in their private setups, they are supposed to also add .local to their search | |
467 | * domains, which we already checked above. Otherwise, we consider .local specific to mDNS and won't | |
468 | * send such queries ordinary DNS servers. */ | |
469 | dns_name_endswith(domain, "local") == 0) | |
faa133f3 | 470 | return DNS_SCOPE_MAYBE; |
1716f6dc | 471 | |
faa133f3 | 472 | return DNS_SCOPE_NO; |
1716f6dc | 473 | |
106784eb | 474 | case DNS_PROTOCOL_MDNS: |
78c6a153 LP |
475 | if ((s->family == AF_INET && dns_name_endswith(domain, "in-addr.arpa") > 0) || |
476 | (s->family == AF_INET6 && dns_name_endswith(domain, "ip6.arpa") > 0) || | |
477 | (dns_name_endswith(domain, "local") > 0 && /* only resolve names ending in .local via mDNS */ | |
478 | dns_name_equal(domain, "local") == 0 && /* but not the single-label "local" name itself */ | |
479 | manager_is_own_hostname(s->manager, domain) <= 0)) /* never resolve the local hostname via mDNS */ | |
d8b7e75f | 480 | return DNS_SCOPE_MAYBE; |
74b2466e LP |
481 | |
482 | return DNS_SCOPE_NO; | |
74b2466e | 483 | |
106784eb | 484 | case DNS_PROTOCOL_LLMNR: |
78c6a153 LP |
485 | if ((s->family == AF_INET && dns_name_endswith(domain, "in-addr.arpa") > 0) || |
486 | (s->family == AF_INET6 && dns_name_endswith(domain, "ip6.arpa") > 0) || | |
dc477e73 | 487 | (dns_name_is_single_label(domain) && /* only resolve single label names via LLMNR */ |
78c6a153 LP |
488 | !is_gateway_hostname(domain) && /* don't resolve "gateway" with LLMNR, let nss-myhostname handle this */ |
489 | manager_is_own_hostname(s->manager, domain) <= 0)) /* never resolve the local hostname via LLMNR */ | |
1716f6dc | 490 | return DNS_SCOPE_MAYBE; |
74b2466e | 491 | |
1716f6dc | 492 | return DNS_SCOPE_NO; |
74b2466e | 493 | |
106784eb DM |
494 | default: |
495 | assert_not_reached("Unknown scope protocol"); | |
496 | } | |
1716f6dc LP |
497 | } |
498 | ||
011696f7 LP |
499 | bool dns_scope_good_key(DnsScope *s, const DnsResourceKey *key) { |
500 | int key_family; | |
501 | ||
1716f6dc LP |
502 | assert(s); |
503 | assert(key); | |
504 | ||
28b9b764 LP |
505 | /* Check if it makes sense to resolve the specified key on |
506 | * this scope. Note that this call assumes as fully qualified | |
507 | * name, i.e. the search suffixes already appended. */ | |
508 | ||
011696f7 LP |
509 | if (key->class != DNS_CLASS_IN) |
510 | return false; | |
511 | ||
28b9b764 LP |
512 | if (s->protocol == DNS_PROTOCOL_DNS) { |
513 | ||
e5abebab | 514 | /* On classic DNS, looking up non-address RRs is always |
28b9b764 LP |
515 | * fine. (Specifically, we want to permit looking up |
516 | * DNSKEY and DS records on the root and top-level | |
517 | * domains.) */ | |
518 | if (!dns_resource_key_is_address(key)) | |
519 | return true; | |
520 | ||
521 | /* However, we refuse to look up A and AAAA RRs on the | |
522 | * root and single-label domains, under the assumption | |
523 | * that those should be resolved via LLMNR or search | |
524 | * path only, and should not be leaked onto the | |
525 | * internet. */ | |
1c02e7ba ZJS |
526 | return !(dns_name_is_single_label(dns_resource_key_name(key)) || |
527 | dns_name_is_root(dns_resource_key_name(key))); | |
28b9b764 | 528 | } |
1716f6dc LP |
529 | |
530 | /* On mDNS and LLMNR, send A and AAAA queries only on the | |
531 | * respective scopes */ | |
532 | ||
011696f7 LP |
533 | key_family = dns_type_to_af(key->type); |
534 | if (key_family < 0) | |
535 | return true; | |
1716f6dc | 536 | |
011696f7 | 537 | return key_family == s->family; |
1716f6dc LP |
538 | } |
539 | ||
0db4c90a | 540 | static int dns_scope_multicast_membership(DnsScope *s, bool b, struct in_addr in, struct in6_addr in6) { |
1716f6dc LP |
541 | int fd; |
542 | ||
5ba73e9b | 543 | assert(s); |
5ba73e9b LP |
544 | assert(s->link); |
545 | ||
1716f6dc LP |
546 | if (s->family == AF_INET) { |
547 | struct ip_mreqn mreqn = { | |
0db4c90a | 548 | .imr_multiaddr = in, |
1716f6dc LP |
549 | .imr_ifindex = s->link->ifindex, |
550 | }; | |
551 | ||
552 | fd = manager_llmnr_ipv4_udp_fd(s->manager); | |
553 | if (fd < 0) | |
554 | return fd; | |
555 | ||
7b4c2ee7 LP |
556 | /* Always first try to drop membership before we add |
557 | * one. This is necessary on some devices, such as | |
558 | * veth. */ | |
559 | if (b) | |
dc751688 | 560 | (void) setsockopt(fd, IPPROTO_IP, IP_DROP_MEMBERSHIP, &mreqn, sizeof(mreqn)); |
7b4c2ee7 | 561 | |
1716f6dc LP |
562 | if (setsockopt(fd, IPPROTO_IP, b ? IP_ADD_MEMBERSHIP : IP_DROP_MEMBERSHIP, &mreqn, sizeof(mreqn)) < 0) |
563 | return -errno; | |
564 | ||
565 | } else if (s->family == AF_INET6) { | |
566 | struct ipv6_mreq mreq = { | |
0db4c90a | 567 | .ipv6mr_multiaddr = in6, |
1716f6dc LP |
568 | .ipv6mr_interface = s->link->ifindex, |
569 | }; | |
570 | ||
571 | fd = manager_llmnr_ipv6_udp_fd(s->manager); | |
572 | if (fd < 0) | |
573 | return fd; | |
574 | ||
7b4c2ee7 | 575 | if (b) |
dc751688 | 576 | (void) setsockopt(fd, IPPROTO_IPV6, IPV6_DROP_MEMBERSHIP, &mreq, sizeof(mreq)); |
7b4c2ee7 | 577 | |
1716f6dc LP |
578 | if (setsockopt(fd, IPPROTO_IPV6, b ? IPV6_ADD_MEMBERSHIP : IPV6_DROP_MEMBERSHIP, &mreq, sizeof(mreq)) < 0) |
579 | return -errno; | |
580 | } else | |
581 | return -EAFNOSUPPORT; | |
582 | ||
583 | return 0; | |
74b2466e | 584 | } |
623a4c97 | 585 | |
0db4c90a | 586 | int dns_scope_llmnr_membership(DnsScope *s, bool b) { |
f471bc11 | 587 | assert(s); |
0db4c90a DM |
588 | |
589 | if (s->protocol != DNS_PROTOCOL_LLMNR) | |
590 | return 0; | |
591 | ||
592 | return dns_scope_multicast_membership(s, b, LLMNR_MULTICAST_IPV4_ADDRESS, LLMNR_MULTICAST_IPV6_ADDRESS); | |
593 | } | |
594 | ||
595 | int dns_scope_mdns_membership(DnsScope *s, bool b) { | |
f471bc11 | 596 | assert(s); |
0db4c90a DM |
597 | |
598 | if (s->protocol != DNS_PROTOCOL_MDNS) | |
599 | return 0; | |
600 | ||
601 | return dns_scope_multicast_membership(s, b, MDNS_MULTICAST_IPV4_ADDRESS, MDNS_MULTICAST_IPV6_ADDRESS); | |
602 | } | |
603 | ||
ec2c5e43 LP |
604 | static int dns_scope_make_reply_packet( |
605 | DnsScope *s, | |
606 | uint16_t id, | |
607 | int rcode, | |
608 | DnsQuestion *q, | |
609 | DnsAnswer *answer, | |
610 | DnsAnswer *soa, | |
611 | bool tentative, | |
612 | DnsPacket **ret) { | |
613 | ||
623a4c97 | 614 | _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL; |
623a4c97 LP |
615 | int r; |
616 | ||
617 | assert(s); | |
a4076574 | 618 | assert(ret); |
623a4c97 | 619 | |
501e8eb0 LP |
620 | if (dns_question_isempty(q) && |
621 | dns_answer_isempty(answer) && | |
622 | dns_answer_isempty(soa)) | |
623a4c97 LP |
623 | return -EINVAL; |
624 | ||
625 | r = dns_packet_new(&p, s->protocol, 0); | |
626 | if (r < 0) | |
627 | return r; | |
628 | ||
629 | DNS_PACKET_HEADER(p)->id = id; | |
ea917db9 LP |
630 | DNS_PACKET_HEADER(p)->flags = htobe16(DNS_PACKET_MAKE_FLAGS( |
631 | 1 /* qr */, | |
632 | 0 /* opcode */, | |
633 | 0 /* c */, | |
634 | 0 /* tc */, | |
ec2c5e43 | 635 | tentative, |
ea917db9 LP |
636 | 0 /* (ra) */, |
637 | 0 /* (ad) */, | |
638 | 0 /* (cd) */, | |
639 | rcode)); | |
623a4c97 | 640 | |
f471bc11 LP |
641 | r = dns_packet_append_question(p, q); |
642 | if (r < 0) | |
643 | return r; | |
644 | DNS_PACKET_HEADER(p)->qdcount = htobe16(dns_question_size(q)); | |
8bf52d3d | 645 | |
f471bc11 LP |
646 | r = dns_packet_append_answer(p, answer); |
647 | if (r < 0) | |
648 | return r; | |
649 | DNS_PACKET_HEADER(p)->ancount = htobe16(dns_answer_size(answer)); | |
8bf52d3d | 650 | |
f471bc11 LP |
651 | r = dns_packet_append_answer(p, soa); |
652 | if (r < 0) | |
653 | return r; | |
654 | DNS_PACKET_HEADER(p)->arcount = htobe16(dns_answer_size(soa)); | |
623a4c97 LP |
655 | |
656 | *ret = p; | |
657 | p = NULL; | |
658 | ||
659 | return 0; | |
660 | } | |
661 | ||
a4076574 | 662 | static void dns_scope_verify_conflicts(DnsScope *s, DnsPacket *p) { |
2a3900d7 LP |
663 | DnsResourceRecord *rr; |
664 | DnsResourceKey *key; | |
a4076574 LP |
665 | |
666 | assert(s); | |
667 | assert(p); | |
668 | ||
2a3900d7 LP |
669 | DNS_QUESTION_FOREACH(key, p->question) |
670 | dns_zone_verify_conflicts(&s->zone, key); | |
671 | ||
672 | DNS_ANSWER_FOREACH(rr, p->answer) | |
673 | dns_zone_verify_conflicts(&s->zone, rr->key); | |
a4076574 LP |
674 | } |
675 | ||
623a4c97 | 676 | void dns_scope_process_query(DnsScope *s, DnsStream *stream, DnsPacket *p) { |
8bf52d3d | 677 | _cleanup_(dns_answer_unrefp) DnsAnswer *answer = NULL, *soa = NULL; |
b30bf55d | 678 | _cleanup_(dns_packet_unrefp) DnsPacket *reply = NULL; |
5032b16d | 679 | DnsResourceKey *key = NULL; |
ec2c5e43 | 680 | bool tentative = false; |
b30bf55d | 681 | int r; |
623a4c97 LP |
682 | |
683 | assert(s); | |
684 | assert(p); | |
685 | ||
686 | if (p->protocol != DNS_PROTOCOL_LLMNR) | |
687 | return; | |
688 | ||
2442b93d LP |
689 | if (p->ipproto == IPPROTO_UDP) { |
690 | /* Don't accept UDP queries directed to anything but | |
691 | * the LLMNR multicast addresses. See RFC 4795, | |
d076c6f9 | 692 | * section 2.5. */ |
2442b93d LP |
693 | |
694 | if (p->family == AF_INET && !in_addr_equal(AF_INET, &p->destination, (union in_addr_union*) &LLMNR_MULTICAST_IPV4_ADDRESS)) | |
695 | return; | |
696 | ||
697 | if (p->family == AF_INET6 && !in_addr_equal(AF_INET6, &p->destination, (union in_addr_union*) &LLMNR_MULTICAST_IPV6_ADDRESS)) | |
698 | return; | |
699 | } | |
700 | ||
623a4c97 LP |
701 | r = dns_packet_extract(p); |
702 | if (r < 0) { | |
b30bf55d | 703 | log_debug_errno(r, "Failed to extract resource records from incoming packet: %m"); |
623a4c97 LP |
704 | return; |
705 | } | |
706 | ||
8b757a38 | 707 | if (DNS_PACKET_LLMNR_C(p)) { |
a4076574 LP |
708 | /* Somebody notified us about a possible conflict */ |
709 | dns_scope_verify_conflicts(s, p); | |
ea917db9 LP |
710 | return; |
711 | } | |
712 | ||
501e8eb0 | 713 | assert(dns_question_size(p->question) == 1); |
5032b16d LP |
714 | key = p->question->keys[0]; |
715 | ||
97ebebbc | 716 | r = dns_zone_lookup(&s->zone, key, 0, &answer, &soa, &tentative); |
623a4c97 | 717 | if (r < 0) { |
da927ba9 | 718 | log_debug_errno(r, "Failed to lookup key: %m"); |
623a4c97 LP |
719 | return; |
720 | } | |
721 | if (r == 0) | |
722 | return; | |
723 | ||
fcf57f9c LP |
724 | if (answer) |
725 | dns_answer_order_by_scope(answer, in_addr_is_link_local(p->family, &p->sender) > 0); | |
af93291c | 726 | |
ec2c5e43 | 727 | r = dns_scope_make_reply_packet(s, DNS_PACKET_ID(p), DNS_RCODE_SUCCESS, p->question, answer, soa, tentative, &reply); |
623a4c97 | 728 | if (r < 0) { |
da927ba9 | 729 | log_debug_errno(r, "Failed to build reply packet: %m"); |
623a4c97 LP |
730 | return; |
731 | } | |
732 | ||
b30bf55d | 733 | if (stream) { |
623a4c97 | 734 | r = dns_stream_write_packet(stream, reply); |
b30bf55d LP |
735 | if (r < 0) { |
736 | log_debug_errno(r, "Failed to enqueue reply packet: %m"); | |
737 | return; | |
738 | } | |
739 | ||
740 | /* Let's take an extra reference on this stream, so that it stays around after returning. The reference | |
741 | * will be dangling until the stream is disconnected, and the default completion handler of the stream | |
742 | * will then unref the stream and destroy it */ | |
743 | if (DNS_STREAM_QUEUED(stream)) | |
744 | dns_stream_ref(stream); | |
745 | } else { | |
746 | int fd; | |
747 | ||
aea2429d LP |
748 | if (!ratelimit_test(&s->ratelimit)) |
749 | return; | |
750 | ||
623a4c97 LP |
751 | if (p->family == AF_INET) |
752 | fd = manager_llmnr_ipv4_udp_fd(s->manager); | |
753 | else if (p->family == AF_INET6) | |
754 | fd = manager_llmnr_ipv6_udp_fd(s->manager); | |
755 | else { | |
756 | log_debug("Unknown protocol"); | |
757 | return; | |
758 | } | |
759 | if (fd < 0) { | |
da927ba9 | 760 | log_debug_errno(fd, "Failed to get reply socket: %m"); |
623a4c97 LP |
761 | return; |
762 | } | |
763 | ||
6e068472 LP |
764 | /* Note that we always immediately reply to all LLMNR |
765 | * requests, and do not wait any time, since we | |
766 | * verified uniqueness for all records. Also see RFC | |
767 | * 4795, Section 2.7 */ | |
768 | ||
b30bf55d LP |
769 | r = manager_send(s->manager, fd, p->ifindex, p->family, &p->sender, p->sender_port, NULL, reply); |
770 | if (r < 0) { | |
771 | log_debug_errno(r, "Failed to send reply packet: %m"); | |
772 | return; | |
773 | } | |
623a4c97 LP |
774 | } |
775 | } | |
ec2c5e43 | 776 | |
f52e61da | 777 | DnsTransaction *dns_scope_find_transaction(DnsScope *scope, DnsResourceKey *key, bool cache_ok) { |
ec2c5e43 LP |
778 | DnsTransaction *t; |
779 | ||
780 | assert(scope); | |
f52e61da | 781 | assert(key); |
ec2c5e43 | 782 | |
da0c630e LP |
783 | /* Try to find an ongoing transaction that is a equal to the |
784 | * specified question */ | |
f9ebb22a | 785 | t = hashmap_get(scope->transactions_by_key, key); |
da0c630e LP |
786 | if (!t) |
787 | return NULL; | |
dc4d47e2 | 788 | |
da0c630e LP |
789 | /* Refuse reusing transactions that completed based on cached |
790 | * data instead of a real packet, if that's requested. */ | |
791 | if (!cache_ok && | |
3bbdc31d | 792 | IN_SET(t->state, DNS_TRANSACTION_SUCCESS, DNS_TRANSACTION_RCODE_FAILURE) && |
c3bc53e6 | 793 | t->answer_source != DNS_TRANSACTION_NETWORK) |
da0c630e | 794 | return NULL; |
ec2c5e43 | 795 | |
da0c630e | 796 | return t; |
ec2c5e43 | 797 | } |
a4076574 LP |
798 | |
799 | static int dns_scope_make_conflict_packet( | |
800 | DnsScope *s, | |
801 | DnsResourceRecord *rr, | |
802 | DnsPacket **ret) { | |
803 | ||
804 | _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL; | |
805 | int r; | |
806 | ||
807 | assert(s); | |
808 | assert(rr); | |
809 | assert(ret); | |
810 | ||
811 | r = dns_packet_new(&p, s->protocol, 0); | |
812 | if (r < 0) | |
813 | return r; | |
814 | ||
815 | DNS_PACKET_HEADER(p)->flags = htobe16(DNS_PACKET_MAKE_FLAGS( | |
816 | 0 /* qr */, | |
817 | 0 /* opcode */, | |
818 | 1 /* conflict */, | |
819 | 0 /* tc */, | |
820 | 0 /* t */, | |
821 | 0 /* (ra) */, | |
822 | 0 /* (ad) */, | |
823 | 0 /* (cd) */, | |
824 | 0)); | |
fe2dfc8b DM |
825 | |
826 | /* For mDNS, the transaction ID should always be 0 */ | |
827 | if (s->protocol != DNS_PROTOCOL_MDNS) | |
828 | random_bytes(&DNS_PACKET_HEADER(p)->id, sizeof(uint16_t)); | |
829 | ||
a4076574 LP |
830 | DNS_PACKET_HEADER(p)->qdcount = htobe16(1); |
831 | DNS_PACKET_HEADER(p)->arcount = htobe16(1); | |
832 | ||
833 | r = dns_packet_append_key(p, rr->key, NULL); | |
834 | if (r < 0) | |
835 | return r; | |
836 | ||
a8812dd7 | 837 | r = dns_packet_append_rr(p, rr, NULL, NULL); |
a4076574 LP |
838 | if (r < 0) |
839 | return r; | |
840 | ||
841 | *ret = p; | |
842 | p = NULL; | |
843 | ||
844 | return 0; | |
845 | } | |
846 | ||
847 | static int on_conflict_dispatch(sd_event_source *es, usec_t usec, void *userdata) { | |
848 | DnsScope *scope = userdata; | |
849 | int r; | |
850 | ||
851 | assert(es); | |
852 | assert(scope); | |
853 | ||
854 | scope->conflict_event_source = sd_event_source_unref(scope->conflict_event_source); | |
855 | ||
856 | for (;;) { | |
857 | _cleanup_(dns_resource_record_unrefp) DnsResourceRecord *rr = NULL; | |
858 | _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL; | |
859 | ||
1e43061b | 860 | rr = ordered_hashmap_steal_first(scope->conflict_queue); |
a4076574 LP |
861 | if (!rr) |
862 | break; | |
863 | ||
864 | r = dns_scope_make_conflict_packet(scope, rr, &p); | |
865 | if (r < 0) { | |
da927ba9 | 866 | log_error_errno(r, "Failed to make conflict packet: %m"); |
a4076574 LP |
867 | return 0; |
868 | } | |
869 | ||
519ef046 | 870 | r = dns_scope_emit_udp(scope, -1, p); |
a4076574 | 871 | if (r < 0) |
da927ba9 | 872 | log_debug_errno(r, "Failed to send conflict packet: %m"); |
a4076574 LP |
873 | } |
874 | ||
875 | return 0; | |
876 | } | |
877 | ||
878 | int dns_scope_notify_conflict(DnsScope *scope, DnsResourceRecord *rr) { | |
879 | usec_t jitter; | |
880 | int r; | |
881 | ||
882 | assert(scope); | |
883 | assert(rr); | |
884 | ||
885 | /* We don't send these queries immediately. Instead, we queue | |
886 | * them, and send them after some jitter delay. */ | |
1e43061b | 887 | r = ordered_hashmap_ensure_allocated(&scope->conflict_queue, &dns_resource_key_hash_ops); |
a4076574 LP |
888 | if (r < 0) { |
889 | log_oom(); | |
890 | return r; | |
891 | } | |
892 | ||
893 | /* We only place one RR per key in the conflict | |
894 | * messages, not all of them. That should be enough to | |
895 | * indicate where there might be a conflict */ | |
1e43061b | 896 | r = ordered_hashmap_put(scope->conflict_queue, rr->key, rr); |
a4076574 LP |
897 | if (r == -EEXIST || r == 0) |
898 | return 0; | |
f647962d MS |
899 | if (r < 0) |
900 | return log_debug_errno(r, "Failed to queue conflicting RR: %m"); | |
a4076574 LP |
901 | |
902 | dns_resource_record_ref(rr); | |
903 | ||
904 | if (scope->conflict_event_source) | |
905 | return 0; | |
906 | ||
907 | random_bytes(&jitter, sizeof(jitter)); | |
908 | jitter %= LLMNR_JITTER_INTERVAL_USEC; | |
909 | ||
910 | r = sd_event_add_time(scope->manager->event, | |
911 | &scope->conflict_event_source, | |
912 | clock_boottime_or_monotonic(), | |
913 | now(clock_boottime_or_monotonic()) + jitter, | |
914 | LLMNR_JITTER_INTERVAL_USEC, | |
915 | on_conflict_dispatch, scope); | |
f647962d MS |
916 | if (r < 0) |
917 | return log_debug_errno(r, "Failed to add conflict dispatch event: %m"); | |
a4076574 | 918 | |
aa4a9deb LP |
919 | (void) sd_event_source_set_description(scope->conflict_event_source, "scope-conflict"); |
920 | ||
a4076574 LP |
921 | return 0; |
922 | } | |
923 | ||
924 | void dns_scope_check_conflicts(DnsScope *scope, DnsPacket *p) { | |
925 | unsigned i; | |
926 | int r; | |
927 | ||
928 | assert(scope); | |
929 | assert(p); | |
930 | ||
931 | if (p->protocol != DNS_PROTOCOL_LLMNR) | |
932 | return; | |
933 | ||
934 | if (DNS_PACKET_RRCOUNT(p) <= 0) | |
935 | return; | |
936 | ||
8b757a38 | 937 | if (DNS_PACKET_LLMNR_C(p) != 0) |
a4076574 LP |
938 | return; |
939 | ||
8b757a38 | 940 | if (DNS_PACKET_LLMNR_T(p) != 0) |
a4076574 LP |
941 | return; |
942 | ||
943 | if (manager_our_packet(scope->manager, p)) | |
944 | return; | |
945 | ||
946 | r = dns_packet_extract(p); | |
947 | if (r < 0) { | |
da927ba9 | 948 | log_debug_errno(r, "Failed to extract packet: %m"); |
a4076574 LP |
949 | return; |
950 | } | |
951 | ||
952 | log_debug("Checking for conflicts..."); | |
953 | ||
954 | for (i = 0; i < p->answer->n_rrs; i++) { | |
955 | ||
956 | /* Check for conflicts against the local zone. If we | |
957 | * found one, we won't check any further */ | |
78c6a153 | 958 | r = dns_zone_check_conflicts(&scope->zone, p->answer->items[i].rr); |
a4076574 LP |
959 | if (r != 0) |
960 | continue; | |
961 | ||
962 | /* Check for conflicts against the local cache. If so, | |
963 | * send out an advisory query, to inform everybody */ | |
78c6a153 | 964 | r = dns_cache_check_conflicts(&scope->cache, p->answer->items[i].rr, p->family, &p->sender); |
a4076574 LP |
965 | if (r <= 0) |
966 | continue; | |
967 | ||
78c6a153 | 968 | dns_scope_notify_conflict(scope, p->answer->items[i].rr); |
a4076574 LP |
969 | } |
970 | } | |
4d506d6b LP |
971 | |
972 | void dns_scope_dump(DnsScope *s, FILE *f) { | |
973 | assert(s); | |
974 | ||
975 | if (!f) | |
976 | f = stdout; | |
977 | ||
978 | fputs("[Scope protocol=", f); | |
979 | fputs(dns_protocol_to_string(s->protocol), f); | |
980 | ||
981 | if (s->link) { | |
982 | fputs(" interface=", f); | |
983 | fputs(s->link->name, f); | |
984 | } | |
985 | ||
986 | if (s->family != AF_UNSPEC) { | |
987 | fputs(" family=", f); | |
988 | fputs(af_to_name(s->family), f); | |
989 | } | |
990 | ||
991 | fputs("]\n", f); | |
992 | ||
993 | if (!dns_zone_is_empty(&s->zone)) { | |
994 | fputs("ZONE:\n", f); | |
995 | dns_zone_dump(&s->zone, f); | |
996 | } | |
997 | ||
998 | if (!dns_cache_is_empty(&s->cache)) { | |
999 | fputs("CACHE:\n", f); | |
1000 | dns_cache_dump(&s->cache, f); | |
1001 | } | |
1002 | } | |
a51c1048 LP |
1003 | |
1004 | DnsSearchDomain *dns_scope_get_search_domains(DnsScope *s) { | |
801ad6a6 LP |
1005 | assert(s); |
1006 | ||
a51c1048 LP |
1007 | if (s->protocol != DNS_PROTOCOL_DNS) |
1008 | return NULL; | |
1009 | ||
1010 | if (s->link) | |
1011 | return s->link->search_domains; | |
1012 | ||
28b9b764 | 1013 | return s->manager->search_domains; |
801ad6a6 LP |
1014 | } |
1015 | ||
dc477e73 | 1016 | bool dns_scope_name_needs_search_domain(DnsScope *s, const char *name) { |
801ad6a6 LP |
1017 | assert(s); |
1018 | ||
1019 | if (s->protocol != DNS_PROTOCOL_DNS) | |
dc477e73 | 1020 | return false; |
801ad6a6 | 1021 | |
dc477e73 | 1022 | return dns_name_is_single_label(name); |
801ad6a6 | 1023 | } |
edbcc1fd LP |
1024 | |
1025 | bool dns_scope_network_good(DnsScope *s) { | |
edbcc1fd LP |
1026 | /* Checks whether the network is in good state for lookups on this scope. For mDNS/LLMNR/Classic DNS scopes |
1027 | * bound to links this is easy, as they don't even exist if the link isn't in a suitable state. For the global | |
1028 | * DNS scope we check whether there are any links that are up and have an address. */ | |
1029 | ||
1030 | if (s->link) | |
1031 | return true; | |
1032 | ||
011696f7 | 1033 | return manager_routable(s->manager, AF_UNSPEC); |
edbcc1fd | 1034 | } |
97ebebbc LP |
1035 | |
1036 | int dns_scope_ifindex(DnsScope *s) { | |
1037 | assert(s); | |
1038 | ||
1039 | if (s->link) | |
1040 | return s->link->ifindex; | |
1041 | ||
1042 | return 0; | |
1043 | } |