resolved: rework parsing of /etc/hosts
[thirdparty/systemd.git] / src / resolve / resolved-manager.c
CommitLineData
53e1b683 1/* SPDX-License-Identifier: LGPL-2.1+ */
091a364c 2
07630cea
LP
3#include <netinet/in.h>
4#include <poll.h>
0d536673 5#include <stdio_ext.h>
74b2466e 6#include <sys/ioctl.h>
091a364c 7
349cc4a5 8#if HAVE_LIBIDN2
87057e24
ZJS
9#include <idn2.h>
10#endif
11
a2a416f7 12#include "af-list.h"
b5efdb8a 13#include "alloc-util.h"
943ef07c 14#include "dirent-util.h"
07630cea 15#include "dns-domain.h"
3ffd4af2 16#include "fd-util.h"
ee228be1 17#include "fileio.h"
07630cea 18#include "hostname-util.h"
c004493c 19#include "io-util.h"
07630cea
LP
20#include "netlink-util.h"
21#include "network-internal.h"
822db23c 22#include "ordered-set.h"
6bedfcbb 23#include "parse-util.h"
3df3e884 24#include "random-util.h"
39d8db04 25#include "resolved-bus.h"
07630cea 26#include "resolved-conf.h"
b30bf55d 27#include "resolved-dns-stub.h"
cb310866 28#include "resolved-dnssd.h"
dd0bc0f1 29#include "resolved-etc-hosts.h"
5f402ae8 30#include "resolved-llmnr.h"
07630cea 31#include "resolved-manager.h"
bc7702b0 32#include "resolved-mdns.h"
dd0bc0f1 33#include "resolved-resolv-conf.h"
07630cea 34#include "socket-util.h"
8b43440b 35#include "string-table.h"
07630cea
LP
36#include "string-util.h"
37#include "utf8.h"
74b2466e
LP
38
39#define SEND_TIMEOUT_USEC (200 * USEC_PER_MSEC)
40
1c4baffc 41static int manager_process_link(sd_netlink *rtnl, sd_netlink_message *mm, void *userdata) {
74b2466e
LP
42 Manager *m = userdata;
43 uint16_t type;
44 Link *l;
45 int ifindex, r;
46
47 assert(rtnl);
48 assert(m);
49 assert(mm);
50
1c4baffc 51 r = sd_netlink_message_get_type(mm, &type);
74b2466e
LP
52 if (r < 0)
53 goto fail;
54
55 r = sd_rtnl_message_link_get_ifindex(mm, &ifindex);
56 if (r < 0)
57 goto fail;
58
59 l = hashmap_get(m->links, INT_TO_PTR(ifindex));
60
61 switch (type) {
62
a2a416f7
LP
63 case RTM_NEWLINK:{
64 bool is_new = !l;
74b2466e 65
a2a416f7 66 if (!l) {
74b2466e
LP
67 r = link_new(m, &l, ifindex);
68 if (r < 0)
69 goto fail;
70 }
71
943ef07c 72 r = link_process_rtnl(l, mm);
74b2466e
LP
73 if (r < 0)
74 goto fail;
75
943ef07c 76 r = link_update(l);
21d73c87
LP
77 if (r < 0)
78 goto fail;
79
a2a416f7
LP
80 if (is_new)
81 log_debug("Found new link %i/%s", ifindex, l->name);
82
74b2466e 83 break;
a2a416f7 84 }
74b2466e
LP
85
86 case RTM_DELLINK:
87 if (l) {
a2a416f7 88 log_debug("Removing link %i/%s", l->ifindex, l->name);
943ef07c 89 link_remove_user(l);
74b2466e
LP
90 link_free(l);
91 }
92
93 break;
94 }
95
96 return 0;
97
98fail:
da927ba9 99 log_warning_errno(r, "Failed to process RTNL link message: %m");
74b2466e
LP
100 return 0;
101}
102
1c4baffc 103static int manager_process_address(sd_netlink *rtnl, sd_netlink_message *mm, void *userdata) {
74b2466e
LP
104 Manager *m = userdata;
105 union in_addr_union address;
74b2466e 106 uint16_t type;
0dd25fb9 107 int r, ifindex, family;
74b2466e
LP
108 LinkAddress *a;
109 Link *l;
110
111 assert(rtnl);
112 assert(mm);
113 assert(m);
114
1c4baffc 115 r = sd_netlink_message_get_type(mm, &type);
74b2466e
LP
116 if (r < 0)
117 goto fail;
118
119 r = sd_rtnl_message_addr_get_ifindex(mm, &ifindex);
120 if (r < 0)
121 goto fail;
122
123 l = hashmap_get(m->links, INT_TO_PTR(ifindex));
124 if (!l)
125 return 0;
126
127 r = sd_rtnl_message_addr_get_family(mm, &family);
128 if (r < 0)
129 goto fail;
130
131 switch (family) {
132
133 case AF_INET:
1c4baffc 134 r = sd_netlink_message_read_in_addr(mm, IFA_LOCAL, &address.in);
74b2466e 135 if (r < 0) {
1c4baffc 136 r = sd_netlink_message_read_in_addr(mm, IFA_ADDRESS, &address.in);
74b2466e
LP
137 if (r < 0)
138 goto fail;
139 }
140
141 break;
142
143 case AF_INET6:
1c4baffc 144 r = sd_netlink_message_read_in6_addr(mm, IFA_LOCAL, &address.in6);
74b2466e 145 if (r < 0) {
1c4baffc 146 r = sd_netlink_message_read_in6_addr(mm, IFA_ADDRESS, &address.in6);
74b2466e
LP
147 if (r < 0)
148 goto fail;
149 }
150
151 break;
152
153 default:
154 return 0;
155 }
156
157 a = link_find_address(l, family, &address);
158
159 switch (type) {
160
161 case RTM_NEWADDR:
162
163 if (!a) {
164 r = link_address_new(l, &a, family, &address);
165 if (r < 0)
166 return r;
167 }
168
169 r = link_address_update_rtnl(a, mm);
170 if (r < 0)
171 return r;
172
173 break;
174
175 case RTM_DELADDR:
3e044c49 176 link_address_free(a);
74b2466e
LP
177 break;
178 }
179
180 return 0;
181
182fail:
da927ba9 183 log_warning_errno(r, "Failed to process RTNL address message: %m");
74b2466e
LP
184 return 0;
185}
186
74b2466e 187static int manager_rtnl_listen(Manager *m) {
4afd3348 188 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL;
1c4baffc 189 sd_netlink_message *i;
74b2466e
LP
190 int r;
191
192 assert(m);
193
cc98b302 194 /* First, subscribe to interfaces coming and going */
1c4baffc 195 r = sd_netlink_open(&m->rtnl);
74b2466e
LP
196 if (r < 0)
197 return r;
198
2d895038 199 r = sd_netlink_attach_event(m->rtnl, m->event, SD_EVENT_PRIORITY_IMPORTANT);
74b2466e
LP
200 if (r < 0)
201 return r;
202
8190a388 203 r = sd_netlink_add_match(m->rtnl, NULL, RTM_NEWLINK, manager_process_link, NULL, m, "resolve-NEWLINK");
74b2466e
LP
204 if (r < 0)
205 return r;
206
8190a388 207 r = sd_netlink_add_match(m->rtnl, NULL, RTM_DELLINK, manager_process_link, NULL, m, "resolve-DELLINK");
74b2466e
LP
208 if (r < 0)
209 return r;
210
8190a388 211 r = sd_netlink_add_match(m->rtnl, NULL, RTM_NEWADDR, manager_process_address, NULL, m, "resolve-NEWADDR");
74b2466e
LP
212 if (r < 0)
213 return r;
091a364c 214
8190a388 215 r = sd_netlink_add_match(m->rtnl, NULL, RTM_DELADDR, manager_process_address, NULL, m, "resolve-DELADDR");
74b2466e
LP
216 if (r < 0)
217 return r;
218
219 /* Then, enumerate all links */
220 r = sd_rtnl_message_new_link(m->rtnl, &req, RTM_GETLINK, 0);
221 if (r < 0)
222 return r;
223
1c4baffc 224 r = sd_netlink_message_request_dump(req, true);
74b2466e
LP
225 if (r < 0)
226 return r;
227
1c4baffc 228 r = sd_netlink_call(m->rtnl, req, 0, &reply);
74b2466e
LP
229 if (r < 0)
230 return r;
231
1c4baffc 232 for (i = reply; i; i = sd_netlink_message_next(i)) {
74b2466e
LP
233 r = manager_process_link(m->rtnl, i, m);
234 if (r < 0)
235 return r;
236 }
237
1c4baffc
TG
238 req = sd_netlink_message_unref(req);
239 reply = sd_netlink_message_unref(reply);
74b2466e
LP
240
241 /* Finally, enumerate all addresses, too */
242 r = sd_rtnl_message_new_addr(m->rtnl, &req, RTM_GETADDR, 0, AF_UNSPEC);
243 if (r < 0)
244 return r;
245
1c4baffc 246 r = sd_netlink_message_request_dump(req, true);
74b2466e
LP
247 if (r < 0)
248 return r;
249
1c4baffc 250 r = sd_netlink_call(m->rtnl, req, 0, &reply);
74b2466e
LP
251 if (r < 0)
252 return r;
253
1c4baffc 254 for (i = reply; i; i = sd_netlink_message_next(i)) {
74b2466e
LP
255 r = manager_process_address(m->rtnl, i, m);
256 if (r < 0)
257 return r;
258 }
259
260 return r;
261}
262
263static int on_network_event(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
264 Manager *m = userdata;
265 Iterator i;
266 Link *l;
267 int r;
268
269 assert(m);
270
271 sd_network_monitor_flush(m->network_monitor);
272
273 HASHMAP_FOREACH(l, m->links, i) {
943ef07c 274 r = link_update(l);
74b2466e 275 if (r < 0)
da927ba9 276 log_warning_errno(r, "Failed to update monitor information for %i: %m", l->ifindex);
74b2466e
LP
277 }
278
7207052d 279 (void) manager_write_resolv_conf(m);
74b2466e
LP
280
281 return 0;
282}
283
284static int manager_network_monitor_listen(Manager *m) {
285 int r, fd, events;
286
287 assert(m);
288
0014a4ad 289 r = sd_network_monitor_new(&m->network_monitor, NULL);
74b2466e
LP
290 if (r < 0)
291 return r;
292
293 fd = sd_network_monitor_get_fd(m->network_monitor);
294 if (fd < 0)
295 return fd;
296
297 events = sd_network_monitor_get_events(m->network_monitor);
298 if (events < 0)
299 return events;
300
301 r = sd_event_add_io(m->event, &m->network_event_source, fd, events, &on_network_event, m);
302 if (r < 0)
2d895038
LP
303 return r;
304
305 r = sd_event_source_set_priority(m->network_event_source, SD_EVENT_PRIORITY_IMPORTANT+5);
306 if (r < 0)
74b2466e
LP
307 return r;
308
aa4a9deb
LP
309 (void) sd_event_source_set_description(m->network_event_source, "network-monitor");
310
74b2466e
LP
311 return 0;
312}
313
e96de0ce 314static int determine_hostname(char **full_hostname, char **llmnr_hostname, char **mdns_hostname) {
eb60f9cd 315 _cleanup_free_ char *h = NULL, *n = NULL;
349cc4a5 316#if HAVE_LIBIDN2
87057e24 317 _cleanup_free_ char *utf8 = NULL;
349cc4a5 318#elif HAVE_LIBIDN
87057e24
ZJS
319 int k;
320#endif
78c6a153 321 char label[DNS_LABEL_MAX];
87057e24
ZJS
322 const char *p, *decoded;
323 int r;
eb60f9cd 324
e96de0ce 325 assert(full_hostname);
78c6a153
LP
326 assert(llmnr_hostname);
327 assert(mdns_hostname);
328
a25b0dc8 329 /* Extract and normalize the first label of the locally configured hostname, and check it's not "localhost". */
eb60f9cd 330
a25b0dc8
LP
331 r = gethostname_strict(&h);
332 if (r < 0)
333 return log_debug_errno(r, "Can't determine system hostname: %m");
eb60f9cd 334
78c6a153 335 p = h;
87057e24 336 r = dns_label_unescape(&p, label, sizeof label);
78c6a153
LP
337 if (r < 0)
338 return log_error_errno(r, "Failed to unescape host name: %m");
baaa35ad
ZJS
339 if (r == 0)
340 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
341 "Couldn't find a single label in hostname.");
78c6a153 342
349cc4a5 343#if HAVE_LIBIDN2
87057e24
ZJS
344 r = idn2_to_unicode_8z8z(label, &utf8, 0);
345 if (r != IDN2_OK)
346 return log_error("Failed to undo IDNA: %s", idn2_strerror(r));
347 assert(utf8_is_valid(utf8));
348
349 r = strlen(utf8);
350 decoded = utf8;
349cc4a5 351#elif HAVE_LIBIDN
87057e24 352 k = dns_label_undo_idna(label, r, label, sizeof label);
78c6a153
LP
353 if (k < 0)
354 return log_error_errno(k, "Failed to undo IDNA: %m");
355 if (k > 0)
356 r = k;
357
baaa35ad
ZJS
358 if (!utf8_is_valid(label))
359 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
360 "System hostname is not UTF-8 clean.");
87057e24
ZJS
361 decoded = label;
362#else
363 decoded = label; /* no decoding */
364#endif
eb60f9cd 365
87057e24 366 r = dns_label_escape_new(decoded, r, &n);
78c6a153
LP
367 if (r < 0)
368 return log_error_errno(r, "Failed to escape host name: %m");
369
baaa35ad
ZJS
370 if (is_localhost(n))
371 return log_debug_errno(SYNTHETIC_ERRNO(EINVAL),
372 "System hostname is 'localhost', ignoring.");
eb60f9cd 373
78c6a153
LP
374 r = dns_name_concat(n, "local", mdns_hostname);
375 if (r < 0)
376 return log_error_errno(r, "Failed to determine mDNS hostname: %m");
377
ae2a15bc
LP
378 *llmnr_hostname = TAKE_PTR(n);
379 *full_hostname = TAKE_PTR(h);
e96de0ce 380
eb60f9cd
LP
381 return 0;
382}
383
a25b0dc8
LP
384static const char *fallback_hostname(void) {
385
386 /* Determine the fall back hostname. For exposing this system to the outside world, we cannot have it to be
387 * "localhost" even if that's the compiled in hostname. In this case, let's revert to "linux" instead. */
388
389 if (is_localhost(FALLBACK_HOSTNAME))
390 return "linux";
391
392 return FALLBACK_HOSTNAME;
393}
394
395static int make_fallback_hostnames(char **full_hostname, char **llmnr_hostname, char **mdns_hostname) {
396 _cleanup_free_ char *n = NULL, *m = NULL;
397 char label[DNS_LABEL_MAX], *h;
398 const char *p;
399 int r;
400
401 assert(full_hostname);
402 assert(llmnr_hostname);
403 assert(mdns_hostname);
404
405 p = fallback_hostname();
406 r = dns_label_unescape(&p, label, sizeof(label));
407 if (r < 0)
408 return log_error_errno(r, "Failed to unescape fallback host name: %m");
409
410 assert(r > 0); /* The fallback hostname must have at least one label */
411
412 r = dns_label_escape_new(label, r, &n);
413 if (r < 0)
414 return log_error_errno(r, "Failed to escape fallback hostname: %m");
415
416 r = dns_name_concat(n, "local", &m);
417 if (r < 0)
418 return log_error_errno(r, "Failed to concatenate mDNS hostname: %m");
419
420 h = strdup(fallback_hostname());
421 if (!h)
422 return log_oom();
423
ae2a15bc
LP
424 *llmnr_hostname = TAKE_PTR(n);
425 *mdns_hostname = TAKE_PTR(m);
a25b0dc8
LP
426
427 *full_hostname = h;
428
429 return 0;
430}
431
eb60f9cd 432static int on_hostname_change(sd_event_source *es, int fd, uint32_t revents, void *userdata) {
e96de0ce 433 _cleanup_free_ char *full_hostname = NULL, *llmnr_hostname = NULL, *mdns_hostname = NULL;
eb60f9cd
LP
434 Manager *m = userdata;
435 int r;
436
437 assert(m);
438
e96de0ce 439 r = determine_hostname(&full_hostname, &llmnr_hostname, &mdns_hostname);
eb60f9cd
LP
440 if (r < 0)
441 return 0; /* ignore invalid hostnames */
442
e96de0ce
LP
443 if (streq(full_hostname, m->full_hostname) &&
444 streq(llmnr_hostname, m->llmnr_hostname) &&
445 streq(mdns_hostname, m->mdns_hostname))
eb60f9cd
LP
446 return 0;
447
e96de0ce 448 log_info("System hostname changed to '%s'.", full_hostname);
78c6a153 449
e96de0ce
LP
450 free_and_replace(m->full_hostname, full_hostname);
451 free_and_replace(m->llmnr_hostname, llmnr_hostname);
452 free_and_replace(m->mdns_hostname, mdns_hostname);
eb60f9cd
LP
453
454 manager_refresh_rrs(m);
455
456 return 0;
457}
458
459static int manager_watch_hostname(Manager *m) {
eb60f9cd
LP
460 int r;
461
462 assert(m);
463
db4a47e9
LP
464 m->hostname_fd = open("/proc/sys/kernel/hostname",
465 O_RDONLY|O_CLOEXEC|O_NONBLOCK|O_NOCTTY);
eb60f9cd 466 if (m->hostname_fd < 0) {
56f64d95 467 log_warning_errno(errno, "Failed to watch hostname: %m");
eb60f9cd
LP
468 return 0;
469 }
470
471 r = sd_event_add_io(m->event, &m->hostname_event_source, m->hostname_fd, 0, on_hostname_change, m);
472 if (r < 0) {
473 if (r == -EPERM)
474 /* kernels prior to 3.2 don't support polling this file. Ignore the failure. */
475 m->hostname_fd = safe_close(m->hostname_fd);
8d3d7072
MS
476 else
477 return log_error_errno(r, "Failed to add hostname event source: %m");
eb60f9cd
LP
478 }
479
aa4a9deb
LP
480 (void) sd_event_source_set_description(m->hostname_event_source, "hostname");
481
e96de0ce 482 r = determine_hostname(&m->full_hostname, &m->llmnr_hostname, &m->mdns_hostname);
eb60f9cd 483 if (r < 0) {
a25b0dc8 484 log_info("Defaulting to hostname '%s'.", fallback_hostname());
78c6a153 485
a25b0dc8
LP
486 r = make_fallback_hostnames(&m->full_hostname, &m->llmnr_hostname, &m->mdns_hostname);
487 if (r < 0)
488 return r;
eb60f9cd 489 } else
e96de0ce 490 log_info("Using system hostname '%s'.", m->full_hostname);
eb60f9cd
LP
491
492 return 0;
493}
494
4d506d6b
LP
495static int manager_sigusr1(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
496 _cleanup_free_ char *buffer = NULL;
497 _cleanup_fclose_ FILE *f = NULL;
498 Manager *m = userdata;
cf84484a 499 DnsServer *server;
4d506d6b
LP
500 size_t size = 0;
501 DnsScope *scope;
cf84484a
LP
502 Iterator i;
503 Link *l;
4d506d6b
LP
504
505 assert(s);
506 assert(si);
507 assert(m);
508
509 f = open_memstream(&buffer, &size);
510 if (!f)
511 return log_oom();
512
0d536673
LP
513 (void) __fsetlocking(f, FSETLOCKING_BYCALLER);
514
4d506d6b
LP
515 LIST_FOREACH(scopes, scope, m->dns_scopes)
516 dns_scope_dump(scope, f);
517
cf84484a
LP
518 LIST_FOREACH(servers, server, m->dns_servers)
519 dns_server_dump(server, f);
520 LIST_FOREACH(servers, server, m->fallback_dns_servers)
521 dns_server_dump(server, f);
522 HASHMAP_FOREACH(l, m->links, i)
523 LIST_FOREACH(servers, server, l->dns_servers)
524 dns_server_dump(server, f);
525
4d506d6b
LP
526 if (fflush_and_check(f) < 0)
527 return log_oom();
528
529 log_dump(LOG_INFO, buffer);
530 return 0;
531}
532
bc81447e
LP
533static int manager_sigusr2(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
534 Manager *m = userdata;
bc81447e
LP
535
536 assert(s);
537 assert(si);
538 assert(m);
539
ba35662f 540 manager_flush_caches(m);
ba35662f 541
bc81447e
LP
542 return 0;
543}
544
d55b0463
LP
545static int manager_sigrtmin1(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
546 Manager *m = userdata;
547
548 assert(s);
549 assert(si);
550 assert(m);
551
552 manager_reset_server_features(m);
553 return 0;
554}
555
091a364c 556int manager_new(Manager **ret) {
74b2466e 557 _cleanup_(manager_freep) Manager *m = NULL;
091a364c
TG
558 int r;
559
c92e531c
LP
560 assert(ret);
561
f55f2dce 562 m = new(Manager, 1);
091a364c
TG
563 if (!m)
564 return -ENOMEM;
565
f55f2dce
YW
566 *m = (Manager) {
567 .llmnr_ipv4_udp_fd = -1,
568 .llmnr_ipv6_udp_fd = -1,
569 .llmnr_ipv4_tcp_fd = -1,
570 .llmnr_ipv6_tcp_fd = -1,
571 .mdns_ipv4_fd = -1,
572 .mdns_ipv6_fd = -1,
573 .dns_stub_udp_fd = -1,
574 .dns_stub_tcp_fd = -1,
575 .hostname_fd = -1,
576
577 .llmnr_support = RESOLVE_SUPPORT_YES,
578 .mdns_support = RESOLVE_SUPPORT_YES,
579 .dnssec_mode = DEFAULT_DNSSEC_MODE,
580 .dns_over_tls_mode = DEFAULT_DNS_OVER_TLS_MODE,
581 .enable_cache = true,
582 .dns_stub_listener_mode = DNS_STUB_LISTENER_UDP,
583 .read_resolv_conf = true,
584 .need_builtin_fallbacks = true,
585 .etc_hosts_last = USEC_INFINITY,
586 .etc_hosts_mtime = USEC_INFINITY,
587 .read_etc_hosts = true,
588 };
091a364c 589
0d2cd476
LP
590 r = dns_trust_anchor_load(&m->trust_anchor);
591 if (r < 0)
592 return r;
593
ad6c0475
LP
594 r = manager_parse_config_file(m);
595 if (r < 0)
5ce497b5 596 log_warning_errno(r, "Failed to parse configuration file: %m");
ad6c0475 597
091a364c
TG
598 r = sd_event_default(&m->event);
599 if (r < 0)
600 return r;
601
1ae17292
YW
602 (void) sd_event_add_signal(m->event, NULL, SIGTERM, NULL, NULL);
603 (void) sd_event_add_signal(m->event, NULL, SIGINT, NULL, NULL);
091a364c 604
1ae17292 605 (void) sd_event_set_watchdog(m->event, true);
091a364c 606
eb60f9cd
LP
607 r = manager_watch_hostname(m);
608 if (r < 0)
609 return r;
610
6501dd31
DR
611 r = dnssd_load(m);
612 if (r < 0)
613 log_warning_errno(r, "Failed to load DNS-SD configuration files: %m");
614
1716f6dc 615 r = dns_scope_new(m, &m->unicast_scope, NULL, DNS_PROTOCOL_DNS, AF_UNSPEC);
74b2466e
LP
616 if (r < 0)
617 return r;
618
619 r = manager_network_monitor_listen(m);
620 if (r < 0)
621 return r;
622
623 r = manager_rtnl_listen(m);
624 if (r < 0)
625 return r;
626
627 r = manager_connect_bus(m);
628 if (r < 0)
629 return r;
630
4d506d6b 631 (void) sd_event_add_signal(m->event, &m->sigusr1_event_source, SIGUSR1, manager_sigusr1, m);
bc81447e 632 (void) sd_event_add_signal(m->event, &m->sigusr2_event_source, SIGUSR2, manager_sigusr2, m);
d55b0463 633 (void) sd_event_add_signal(m->event, &m->sigrtmin1_event_source, SIGRTMIN+1, manager_sigrtmin1, m);
4d506d6b 634
943ef07c
LP
635 manager_cleanup_saved_user(m);
636
1cc6c93a 637 *ret = TAKE_PTR(m);
091a364c
TG
638
639 return 0;
640}
641
edc501d4
LP
642int manager_start(Manager *m) {
643 int r;
644
645 assert(m);
646
b30bf55d
LP
647 r = manager_dns_stub_start(m);
648 if (r < 0)
649 return r;
650
edc501d4
LP
651 return 0;
652}
653
74b2466e
LP
654Manager *manager_free(Manager *m) {
655 Link *l;
6501dd31 656 DnssdService *s;
091a364c
TG
657
658 if (!m)
74b2466e
LP
659 return NULL;
660
4b95f179
LP
661 dns_server_unlink_all(m->dns_servers);
662 dns_server_unlink_all(m->fallback_dns_servers);
a51c1048
LP
663 dns_search_domain_unlink_all(m->search_domains);
664
74b2466e
LP
665 while ((l = hashmap_first(m->links)))
666 link_free(l);
f0e15467
LP
667
668 while (m->dns_queries)
669 dns_query_free(m->dns_queries);
74b2466e 670
cab5b059
LP
671 dns_scope_free(m->unicast_scope);
672
b30bf55d
LP
673 /* At this point only orphaned streams should remain. All others should have been freed already by their
674 * owners */
675 while (m->dns_streams)
676 dns_stream_unref(m->dns_streams);
677
f0e15467
LP
678 hashmap_free(m->links);
679 hashmap_free(m->dns_transactions);
680
096b6773
LP
681 sd_event_source_unref(m->network_event_source);
682 sd_network_monitor_unref(m->network_monitor);
091a364c 683
a564ca2f
LP
684 sd_netlink_unref(m->rtnl);
685 sd_event_source_unref(m->rtnl_event_source);
686
edc501d4 687 manager_llmnr_stop(m);
bc7702b0 688 manager_mdns_stop(m);
b30bf55d 689 manager_dns_stub_stop(m);
623a4c97 690
74b2466e 691 sd_bus_unref(m->bus);
091a364c 692
4d506d6b 693 sd_event_source_unref(m->sigusr1_event_source);
bc81447e 694 sd_event_source_unref(m->sigusr2_event_source);
d55b0463 695 sd_event_source_unref(m->sigrtmin1_event_source);
4d506d6b 696
74b2466e 697 sd_event_unref(m->event);
623a4c97 698
78c6a153
LP
699 dns_resource_key_unref(m->llmnr_host_ipv4_key);
700 dns_resource_key_unref(m->llmnr_host_ipv6_key);
400cb36e
DR
701 dns_resource_key_unref(m->mdns_host_ipv4_key);
702 dns_resource_key_unref(m->mdns_host_ipv6_key);
eb60f9cd 703
eb60f9cd 704 sd_event_source_unref(m->hostname_event_source);
d9fcf2ba 705 safe_close(m->hostname_fd);
e96de0ce
LP
706
707 free(m->full_hostname);
78c6a153
LP
708 free(m->llmnr_hostname);
709 free(m->mdns_hostname);
eb60f9cd 710
6501dd31
DR
711 while ((s = hashmap_first(m->dnssd_services)))
712 dnssd_service_free(s);
713 hashmap_free(m->dnssd_services);
714
0d2cd476 715 dns_trust_anchor_flush(&m->trust_anchor);
dd0bc0f1 716 manager_etc_hosts_flush(m);
0d2cd476 717
6b430fdb 718 return mfree(m);
091a364c
TG
719}
720
1716f6dc 721int manager_recv(Manager *m, int fd, DnsProtocol protocol, DnsPacket **ret) {
74b2466e 722 _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL;
1716f6dc
LP
723 union {
724 struct cmsghdr header; /* For alignment */
40a1eebd 725 uint8_t buffer[CMSG_SPACE(MAXSIZE(struct in_pktinfo, struct in6_pktinfo))
1716f6dc 726 + CMSG_SPACE(int) /* ttl/hoplimit */
623a4c97 727 + EXTRA_CMSG_SPACE /* kernel appears to require extra buffer space */];
1716f6dc
LP
728 } control;
729 union sockaddr_union sa;
74b2466e 730 struct iovec iov;
f55f2dce
YW
731 struct msghdr mh = {
732 .msg_name = &sa.sa,
733 .msg_namelen = sizeof(sa),
734 .msg_iov = &iov,
735 .msg_iovlen = 1,
736 .msg_control = &control,
737 .msg_controllen = sizeof(control),
738 };
739 struct cmsghdr *cmsg;
4edc2c9b
LP
740 ssize_t ms, l;
741 int r;
74b2466e
LP
742
743 assert(m);
1716f6dc 744 assert(fd >= 0);
74b2466e
LP
745 assert(ret);
746
4edc2c9b 747 ms = next_datagram_size_fd(fd);
74b2466e 748 if (ms < 0)
4edc2c9b 749 return ms;
74b2466e 750
51027656 751 r = dns_packet_new(&p, protocol, ms, DNS_PACKET_SIZE_MAX);
74b2466e
LP
752 if (r < 0)
753 return r;
754
cb310866 755 iov = IOVEC_MAKE(DNS_PACKET_DATA(p), p->allocated);
74b2466e 756
a38d9945 757 l = recvmsg(fd, &mh, 0);
74b2466e 758 if (l < 0) {
4c701096 759 if (IN_SET(errno, EAGAIN, EINTR))
74b2466e
LP
760 return 0;
761
762 return -errno;
091a364c 763 }
cb310866
LP
764 if (l == 0)
765 return 0;
091a364c 766
1716f6dc
LP
767 assert(!(mh.msg_flags & MSG_CTRUNC));
768 assert(!(mh.msg_flags & MSG_TRUNC));
769
74b2466e 770 p->size = (size_t) l;
091a364c 771
1716f6dc 772 p->family = sa.sa.sa_family;
623a4c97
LP
773 p->ipproto = IPPROTO_UDP;
774 if (p->family == AF_INET) {
1716f6dc 775 p->sender.in = sa.in.sin_addr;
623a4c97
LP
776 p->sender_port = be16toh(sa.in.sin_port);
777 } else if (p->family == AF_INET6) {
1716f6dc 778 p->sender.in6 = sa.in6.sin6_addr;
623a4c97
LP
779 p->sender_port = be16toh(sa.in6.sin6_port);
780 p->ifindex = sa.in6.sin6_scope_id;
781 } else
1716f6dc 782 return -EAFNOSUPPORT;
74b2466e 783
2a1288ff 784 CMSG_FOREACH(cmsg, &mh) {
74b2466e 785
1716f6dc
LP
786 if (cmsg->cmsg_level == IPPROTO_IPV6) {
787 assert(p->family == AF_INET6);
74b2466e 788
1716f6dc 789 switch (cmsg->cmsg_type) {
74b2466e 790
1716f6dc
LP
791 case IPV6_PKTINFO: {
792 struct in6_pktinfo *i = (struct in6_pktinfo*) CMSG_DATA(cmsg);
74b2466e 793
623a4c97
LP
794 if (p->ifindex <= 0)
795 p->ifindex = i->ipi6_ifindex;
796
1716f6dc
LP
797 p->destination.in6 = i->ipi6_addr;
798 break;
799 }
74b2466e 800
1716f6dc
LP
801 case IPV6_HOPLIMIT:
802 p->ttl = *(int *) CMSG_DATA(cmsg);
803 break;
74b2466e 804
1716f6dc
LP
805 }
806 } else if (cmsg->cmsg_level == IPPROTO_IP) {
807 assert(p->family == AF_INET);
74b2466e 808
1716f6dc 809 switch (cmsg->cmsg_type) {
74b2466e 810
1716f6dc
LP
811 case IP_PKTINFO: {
812 struct in_pktinfo *i = (struct in_pktinfo*) CMSG_DATA(cmsg);
091a364c 813
623a4c97
LP
814 if (p->ifindex <= 0)
815 p->ifindex = i->ipi_ifindex;
816
1716f6dc
LP
817 p->destination.in = i->ipi_addr;
818 break;
819 }
74b2466e 820
623a4c97 821 case IP_TTL:
1716f6dc
LP
822 p->ttl = *(int *) CMSG_DATA(cmsg);
823 break;
824 }
825 }
826 }
74b2466e 827
623a4c97
LP
828 /* The Linux kernel sets the interface index to the loopback
829 * device if the packet came from the local host since it
830 * avoids the routing table in such a case. Let's unset the
831 * interface index in such a case. */
a5f03596 832 if (p->ifindex == LOOPBACK_IFINDEX)
623a4c97
LP
833 p->ifindex = 0;
834
86ad4cd7
TG
835 if (protocol != DNS_PROTOCOL_DNS) {
836 /* If we don't know the interface index still, we look for the
837 * first local interface with a matching address. Yuck! */
838 if (p->ifindex <= 0)
839 p->ifindex = manager_find_ifindex(m, p->family, &p->destination);
840 }
623a4c97 841
1cc6c93a 842 *ret = TAKE_PTR(p);
74b2466e
LP
843
844 return 1;
845}
846
74b2466e
LP
847static int sendmsg_loop(int fd, struct msghdr *mh, int flags) {
848 int r;
849
850 assert(fd >= 0);
851 assert(mh);
852
853 for (;;) {
854 if (sendmsg(fd, mh, flags) >= 0)
855 return 0;
856
857 if (errno == EINTR)
858 continue;
859
860 if (errno != EAGAIN)
861 return -errno;
862
863 r = fd_wait_for_event(fd, POLLOUT, SEND_TIMEOUT_USEC);
864 if (r < 0)
865 return r;
866 if (r == 0)
867 return -ETIMEDOUT;
868 }
869}
870
72290734
TG
871static int write_loop(int fd, void *message, size_t length) {
872 int r;
873
874 assert(fd >= 0);
875 assert(message);
876
877 for (;;) {
878 if (write(fd, message, length) >= 0)
879 return 0;
880
881 if (errno == EINTR)
882 continue;
883
884 if (errno != EAGAIN)
885 return -errno;
886
887 r = fd_wait_for_event(fd, POLLOUT, SEND_TIMEOUT_USEC);
888 if (r < 0)
889 return r;
890 if (r == 0)
891 return -ETIMEDOUT;
892 }
893}
894
895int manager_write(Manager *m, int fd, DnsPacket *p) {
896 int r;
897
deb3f3d3 898 log_debug("Sending %s packet with id %" PRIu16 ".", DNS_PACKET_QR(p) ? "response" : "query", DNS_PACKET_ID(p));
72290734
TG
899
900 r = write_loop(fd, DNS_PACKET_DATA(p), p->size);
901 if (r < 0)
902 return r;
903
904 return 0;
905}
906
b30bf55d
LP
907static int manager_ipv4_send(
908 Manager *m,
909 int fd,
910 int ifindex,
911 const struct in_addr *destination,
912 uint16_t port,
913 const struct in_addr *source,
914 DnsPacket *p) {
1716f6dc
LP
915 union {
916 struct cmsghdr header; /* For alignment */
917 uint8_t buffer[CMSG_SPACE(sizeof(struct in_pktinfo))];
f55f2dce
YW
918 } control = {};
919 union sockaddr_union sa;
74b2466e 920 struct iovec iov;
f55f2dce
YW
921 struct msghdr mh = {
922 .msg_iov = &iov,
923 .msg_iovlen = 1,
924 .msg_name = &sa.sa,
925 .msg_namelen = sizeof(sa.in),
926 };
74b2466e
LP
927
928 assert(m);
1716f6dc 929 assert(fd >= 0);
b30bf55d 930 assert(destination);
1716f6dc 931 assert(port > 0);
74b2466e
LP
932 assert(p);
933
cb310866 934 iov = IOVEC_MAKE(DNS_PACKET_DATA(p), p->size);
091a364c 935
f55f2dce
YW
936 sa = (union sockaddr_union) {
937 .in.sin_family = AF_INET,
938 .in.sin_addr = *destination,
939 .in.sin_port = htobe16(port),
940 };
091a364c 941
74b2466e
LP
942 if (ifindex > 0) {
943 struct cmsghdr *cmsg;
944 struct in_pktinfo *pi;
945
1716f6dc 946 mh.msg_control = &control;
74b2466e
LP
947 mh.msg_controllen = CMSG_LEN(sizeof(struct in_pktinfo));
948
949 cmsg = CMSG_FIRSTHDR(&mh);
950 cmsg->cmsg_len = mh.msg_controllen;
951 cmsg->cmsg_level = IPPROTO_IP;
952 cmsg->cmsg_type = IP_PKTINFO;
953
954 pi = (struct in_pktinfo*) CMSG_DATA(cmsg);
955 pi->ipi_ifindex = ifindex;
b30bf55d
LP
956
957 if (source)
958 pi->ipi_spec_dst = *source;
74b2466e
LP
959 }
960
961 return sendmsg_loop(fd, &mh, 0);
962}
963
b30bf55d
LP
964static int manager_ipv6_send(
965 Manager *m,
966 int fd,
967 int ifindex,
968 const struct in6_addr *destination,
969 uint16_t port,
970 const struct in6_addr *source,
971 DnsPacket *p) {
972
1716f6dc
LP
973 union {
974 struct cmsghdr header; /* For alignment */
975 uint8_t buffer[CMSG_SPACE(sizeof(struct in6_pktinfo))];
f55f2dce
YW
976 } control = {};
977 union sockaddr_union sa;
74b2466e 978 struct iovec iov;
f55f2dce
YW
979 struct msghdr mh = {
980 .msg_iov = &iov,
981 .msg_iovlen = 1,
982 .msg_name = &sa.sa,
983 .msg_namelen = sizeof(sa.in6),
984 };
74b2466e
LP
985
986 assert(m);
1716f6dc 987 assert(fd >= 0);
b30bf55d 988 assert(destination);
1716f6dc 989 assert(port > 0);
74b2466e
LP
990 assert(p);
991
cb310866 992 iov = IOVEC_MAKE(DNS_PACKET_DATA(p), p->size);
74b2466e 993
f55f2dce
YW
994 sa = (union sockaddr_union) {
995 .in6.sin6_family = AF_INET6,
996 .in6.sin6_addr = *destination,
997 .in6.sin6_port = htobe16(port),
998 .in6.sin6_scope_id = ifindex,
999 };
74b2466e
LP
1000
1001 if (ifindex > 0) {
1002 struct cmsghdr *cmsg;
1003 struct in6_pktinfo *pi;
1004
1716f6dc 1005 mh.msg_control = &control;
74b2466e
LP
1006 mh.msg_controllen = CMSG_LEN(sizeof(struct in6_pktinfo));
1007
1008 cmsg = CMSG_FIRSTHDR(&mh);
1009 cmsg->cmsg_len = mh.msg_controllen;
1010 cmsg->cmsg_level = IPPROTO_IPV6;
1011 cmsg->cmsg_type = IPV6_PKTINFO;
1012
1013 pi = (struct in6_pktinfo*) CMSG_DATA(cmsg);
1014 pi->ipi6_ifindex = ifindex;
b30bf55d
LP
1015
1016 if (source)
1017 pi->ipi6_addr = *source;
74b2466e
LP
1018 }
1019
1020 return sendmsg_loop(fd, &mh, 0);
1021}
1022
b30bf55d
LP
1023int manager_send(
1024 Manager *m,
1025 int fd,
1026 int ifindex,
1027 int family,
1028 const union in_addr_union *destination,
1029 uint16_t port,
1030 const union in_addr_union *source,
1031 DnsPacket *p) {
1032
1716f6dc
LP
1033 assert(m);
1034 assert(fd >= 0);
b30bf55d 1035 assert(destination);
1716f6dc
LP
1036 assert(port > 0);
1037 assert(p);
1038
deb3f3d3 1039 log_debug("Sending %s packet with id %" PRIu16 " on interface %i/%s.", DNS_PACKET_QR(p) ? "response" : "query", DNS_PACKET_ID(p), ifindex, af_to_name(family));
a2a416f7 1040
1716f6dc 1041 if (family == AF_INET)
25270cf3 1042 return manager_ipv4_send(m, fd, ifindex, &destination->in, port, source ? &source->in : NULL, p);
2817157b 1043 if (family == AF_INET6)
25270cf3 1044 return manager_ipv6_send(m, fd, ifindex, &destination->in6, port, source ? &source->in6 : NULL, p);
1716f6dc
LP
1045
1046 return -EAFNOSUPPORT;
1047}
1048
e1c95994
LP
1049uint32_t manager_find_mtu(Manager *m) {
1050 uint32_t mtu = 0;
1051 Link *l;
1052 Iterator i;
1053
1054 /* If we don't know on which link a DNS packet would be
1055 * delivered, let's find the largest MTU that works on all
1056 * interfaces we know of */
1057
1058 HASHMAP_FOREACH(l, m->links, i) {
1059 if (l->mtu <= 0)
1060 continue;
1061
1062 if (mtu <= 0 || l->mtu < mtu)
1063 mtu = l->mtu;
1064 }
1065
1066 return mtu;
1067}
1716f6dc 1068
623a4c97 1069int manager_find_ifindex(Manager *m, int family, const union in_addr_union *in_addr) {
ec2c5e43
LP
1070 LinkAddress *a;
1071
1072 assert(m);
1073
4e945a6f 1074 a = manager_find_link_address(m, family, in_addr);
ec2c5e43
LP
1075 if (a)
1076 return a->link->ifindex;
1077
1078 return 0;
1079}
1080
eb60f9cd
LP
1081void manager_refresh_rrs(Manager *m) {
1082 Iterator i;
1083 Link *l;
6db6a464 1084 DnssdService *s;
eb60f9cd
LP
1085
1086 assert(m);
1087
78c6a153
LP
1088 m->llmnr_host_ipv4_key = dns_resource_key_unref(m->llmnr_host_ipv4_key);
1089 m->llmnr_host_ipv6_key = dns_resource_key_unref(m->llmnr_host_ipv6_key);
400cb36e
DR
1090 m->mdns_host_ipv4_key = dns_resource_key_unref(m->mdns_host_ipv4_key);
1091 m->mdns_host_ipv6_key = dns_resource_key_unref(m->mdns_host_ipv6_key);
eb60f9cd 1092
6db6a464
DR
1093 if (m->mdns_support == RESOLVE_SUPPORT_YES)
1094 HASHMAP_FOREACH(s, m->dnssd_services, i)
1095 if (dnssd_update_rrs(s) < 0)
1096 log_warning("Failed to refresh DNS-SD service '%s'", s->name);
1097
eb60f9cd
LP
1098 HASHMAP_FOREACH(l, m->links, i) {
1099 link_add_rrs(l, true);
1100 link_add_rrs(l, false);
1101 }
1102}
1103
e7c1b0e4 1104static int manager_next_random_name(const char *old, char **ret_new) {
ec2c5e43 1105 const char *p;
556a2294 1106 uint64_t u, a;
e7c1b0e4 1107 char *n;
623a4c97 1108
e7c1b0e4 1109 p = strchr(old, 0);
ec2c5e43
LP
1110 assert(p);
1111
e7c1b0e4
DR
1112 while (p > old) {
1113 if (!strchr(DIGITS, p[-1]))
ec2c5e43
LP
1114 break;
1115
1116 p--;
1117 }
1118
1119 if (*p == 0 || safe_atou64(p, &u) < 0 || u <= 0)
1120 u = 1;
1121
556a2294
LP
1122 /* Add a random number to the old value. This way we can avoid
1123 * that two hosts pick the same hostname, win on IPv4 and lose
1124 * on IPv6 (or vice versa), and pick the same hostname
1125 * replacement hostname, ad infinitum. We still want the
1126 * numbers to go up monotonically, hence we just add a random
1127 * value 1..10 */
1128
1129 random_bytes(&a, sizeof(a));
1130 u += 1 + a % 10;
ec2c5e43 1131
e7c1b0e4 1132 if (asprintf(&n, "%.*s%" PRIu64, (int) (p - old), old, u) < 0)
ec2c5e43
LP
1133 return -ENOMEM;
1134
e7c1b0e4
DR
1135 *ret_new = n;
1136
1137 return 0;
1138}
1139
1140int manager_next_hostname(Manager *m) {
1141 _cleanup_free_ char *h = NULL, *k = NULL;
1142 int r;
1143
1144 assert(m);
1145
1146 r = manager_next_random_name(m->llmnr_hostname, &h);
1147 if (r < 0)
1148 return r;
1149
78c6a153 1150 r = dns_name_concat(h, "local", &k);
e7c1b0e4 1151 if (r < 0)
78c6a153 1152 return r;
78c6a153
LP
1153
1154 log_info("Hostname conflict, changing published hostname from '%s' to '%s'.", m->llmnr_hostname, h);
1155
e7c1b0e4
DR
1156 free_and_replace(m->llmnr_hostname, h);
1157 free_and_replace(m->mdns_hostname, k);
ec2c5e43 1158
eb60f9cd 1159 manager_refresh_rrs(m);
623a4c97
LP
1160
1161 return 0;
1162}
ec2c5e43 1163
4e945a6f 1164LinkAddress* manager_find_link_address(Manager *m, int family, const union in_addr_union *in_addr) {
ec2c5e43
LP
1165 Iterator i;
1166 Link *l;
1167
1168 assert(m);
1169
1170 HASHMAP_FOREACH(l, m->links, i) {
1171 LinkAddress *a;
1172
1173 a = link_find_address(l, family, in_addr);
1174 if (a)
1175 return a;
1176 }
1177
1178 return NULL;
1179}
1180
a4076574 1181bool manager_our_packet(Manager *m, DnsPacket *p) {
ec2c5e43
LP
1182 assert(m);
1183 assert(p);
1184
4e945a6f 1185 return !!manager_find_link_address(m, p->family, &p->sender);
ec2c5e43 1186}
4e945a6f 1187
a4076574
LP
1188DnsScope* manager_find_scope(Manager *m, DnsPacket *p) {
1189 Link *l;
1190
1191 assert(m);
1192 assert(p);
1193
1194 l = hashmap_get(m->links, INT_TO_PTR(p->ifindex));
1195 if (!l)
1196 return NULL;
1197
b4f1862d
DM
1198 switch (p->protocol) {
1199 case DNS_PROTOCOL_LLMNR:
a4076574
LP
1200 if (p->family == AF_INET)
1201 return l->llmnr_ipv4_scope;
1202 else if (p->family == AF_INET6)
1203 return l->llmnr_ipv6_scope;
b4f1862d
DM
1204
1205 break;
1206
1207 case DNS_PROTOCOL_MDNS:
1208 if (p->family == AF_INET)
1209 return l->mdns_ipv4_scope;
1210 else if (p->family == AF_INET6)
1211 return l->mdns_ipv6_scope;
1212
1213 break;
1214
1215 default:
1216 break;
a4076574
LP
1217 }
1218
1219 return NULL;
1220}
1221
902bb5d8
LP
1222void manager_verify_all(Manager *m) {
1223 DnsScope *s;
1224
1225 assert(m);
1226
1227 LIST_FOREACH(scopes, s, m->dns_scopes)
1228 dns_zone_verify_all(&s->zone);
1229}
1230
78c6a153 1231int manager_is_own_hostname(Manager *m, const char *name) {
78c6a153
LP
1232 int r;
1233
1234 assert(m);
1235 assert(name);
1236
1237 if (m->llmnr_hostname) {
1238 r = dns_name_equal(name, m->llmnr_hostname);
1239 if (r != 0)
1240 return r;
1241 }
1242
e96de0ce
LP
1243 if (m->mdns_hostname) {
1244 r = dns_name_equal(name, m->mdns_hostname);
1245 if (r != 0)
1246 return r;
1247 }
1248
1249 if (m->full_hostname)
1250 return dns_name_equal(name, m->full_hostname);
78c6a153
LP
1251
1252 return 0;
1253}
1254
9176a57c
LP
1255int manager_compile_dns_servers(Manager *m, OrderedSet **dns) {
1256 DnsServer *s;
1257 Iterator i;
1258 Link *l;
1259 int r;
1260
1261 assert(m);
1262 assert(dns);
1263
1264 r = ordered_set_ensure_allocated(dns, &dns_server_hash_ops);
1265 if (r < 0)
1266 return r;
1267
1268 /* First add the system-wide servers and domains */
1269 LIST_FOREACH(servers, s, m->dns_servers) {
1270 r = ordered_set_put(*dns, s);
1271 if (r == -EEXIST)
1272 continue;
1273 if (r < 0)
1274 return r;
1275 }
1276
1277 /* Then, add the per-link servers */
1278 HASHMAP_FOREACH(l, m->links, i) {
1279 LIST_FOREACH(servers, s, l->dns_servers) {
1280 r = ordered_set_put(*dns, s);
1281 if (r == -EEXIST)
1282 continue;
1283 if (r < 0)
1284 return r;
1285 }
1286 }
1287
1288 /* If we found nothing, add the fallback servers */
1289 if (ordered_set_isempty(*dns)) {
1290 LIST_FOREACH(servers, s, m->fallback_dns_servers) {
1291 r = ordered_set_put(*dns, s);
1292 if (r == -EEXIST)
1293 continue;
1294 if (r < 0)
1295 return r;
1296 }
1297 }
1298
1299 return 0;
1300}
1301
94363cbb
MP
1302/* filter_route is a tri-state:
1303 * < 0: no filtering
1304 * = 0 or false: return only domains which should be used for searching
1305 * > 0 or true: return only domains which are for routing only
1306 */
6f7da49d 1307int manager_compile_search_domains(Manager *m, OrderedSet **domains, int filter_route) {
9176a57c
LP
1308 DnsSearchDomain *d;
1309 Iterator i;
1310 Link *l;
1311 int r;
1312
1313 assert(m);
1314 assert(domains);
1315
1316 r = ordered_set_ensure_allocated(domains, &dns_name_hash_ops);
1317 if (r < 0)
1318 return r;
1319
1320 LIST_FOREACH(domains, d, m->search_domains) {
6f7da49d
LP
1321
1322 if (filter_route >= 0 &&
1323 d->route_only != !!filter_route)
1324 continue;
1325
9176a57c
LP
1326 r = ordered_set_put(*domains, d->name);
1327 if (r == -EEXIST)
1328 continue;
1329 if (r < 0)
1330 return r;
1331 }
1332
1333 HASHMAP_FOREACH(l, m->links, i) {
1334
1335 LIST_FOREACH(domains, d, l->search_domains) {
6f7da49d
LP
1336
1337 if (filter_route >= 0 &&
1338 d->route_only != !!filter_route)
1339 continue;
1340
9176a57c
LP
1341 r = ordered_set_put(*domains, d->name);
1342 if (r == -EEXIST)
1343 continue;
1344 if (r < 0)
1345 return r;
1346 }
1347 }
1348
1349 return 0;
1350}
c69fa7e3
LP
1351
1352DnssecMode manager_get_dnssec_mode(Manager *m) {
1353 assert(m);
1354
1355 if (m->dnssec_mode != _DNSSEC_MODE_INVALID)
1356 return m->dnssec_mode;
1357
1358 return DNSSEC_NO;
1359}
1360
1361bool manager_dnssec_supported(Manager *m) {
1362 DnsServer *server;
1363 Iterator i;
1364 Link *l;
1365
1366 assert(m);
1367
1368 if (manager_get_dnssec_mode(m) == DNSSEC_NO)
1369 return false;
1370
1371 server = manager_get_dns_server(m);
1372 if (server && !dns_server_dnssec_supported(server))
1373 return false;
1374
1375 HASHMAP_FOREACH(l, m->links, i)
1376 if (!link_dnssec_supported(l))
1377 return false;
1378
1379 return true;
1380}
59c5b597 1381
c9299be2 1382DnsOverTlsMode manager_get_dns_over_tls_mode(Manager *m) {
5d67a7ae
IT
1383 assert(m);
1384
c9299be2
IT
1385 if (m->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
1386 return m->dns_over_tls_mode;
5d67a7ae 1387
c9299be2 1388 return DNS_OVER_TLS_NO;
5d67a7ae
IT
1389}
1390
59c5b597
LP
1391void manager_dnssec_verdict(Manager *m, DnssecVerdict verdict, const DnsResourceKey *key) {
1392
1393 assert(verdict >= 0);
1394 assert(verdict < _DNSSEC_VERDICT_MAX);
1395
f1d34068 1396 if (DEBUG_LOGGING) {
202b76ae 1397 char s[DNS_RESOURCE_KEY_STRING_MAX];
59c5b597 1398
202b76ae
ZJS
1399 log_debug("Found verdict for lookup %s: %s",
1400 dns_resource_key_to_string(key, s, sizeof s),
1401 dnssec_verdict_to_string(verdict));
59c5b597
LP
1402 }
1403
1404 m->n_dnssec_verdict[verdict]++;
1405}
011696f7
LP
1406
1407bool manager_routable(Manager *m, int family) {
1408 Iterator i;
1409 Link *l;
1410
1411 assert(m);
1412
1413 /* Returns true if the host has at least one interface with a routable address of the specified type */
1414
1415 HASHMAP_FOREACH(l, m->links, i)
1416 if (link_relevant(l, family, false))
1417 return true;
1418
1419 return false;
1420}
ba35662f
LP
1421
1422void manager_flush_caches(Manager *m) {
1423 DnsScope *scope;
1424
1425 assert(m);
1426
1427 LIST_FOREACH(scopes, scope, m->dns_scopes)
1428 dns_cache_flush(&scope->cache);
aac57b35
ZJS
1429
1430 log_info("Flushed all caches.");
ba35662f 1431}
943ef07c 1432
59c0fd0e
LP
1433void manager_reset_server_features(Manager *m) {
1434 Iterator i;
1435 Link *l;
1436
1437 dns_server_reset_features_all(m->dns_servers);
1438 dns_server_reset_features_all(m->fallback_dns_servers);
1439
1440 HASHMAP_FOREACH(l, m->links, i)
1441 dns_server_reset_features_all(l->dns_servers);
1442
1443 log_info("Resetting learnt feature levels on all servers.");
1444}
1445
943ef07c
LP
1446void manager_cleanup_saved_user(Manager *m) {
1447 _cleanup_closedir_ DIR *d = NULL;
1448 struct dirent *de;
1449 int r;
1450
1451 assert(m);
1452
1453 /* Clean up all saved per-link files in /run/systemd/resolve/netif/ that don't have a matching interface
1454 * anymore. These files are created to persist settings pushed in by the user via the bus, so that resolved can
1455 * be restarted without losing this data. */
1456
1457 d = opendir("/run/systemd/resolve/netif/");
1458 if (!d) {
1459 if (errno == ENOENT)
1460 return;
1461
1462 log_warning_errno(errno, "Failed to open interface directory: %m");
1463 return;
1464 }
1465
1466 FOREACH_DIRENT_ALL(de, d, log_error_errno(errno, "Failed to read interface directory: %m")) {
1467 _cleanup_free_ char *p = NULL;
1468 int ifindex;
1469 Link *l;
1470
1471 if (!IN_SET(de->d_type, DT_UNKNOWN, DT_REG))
1472 continue;
1473
49bfc877 1474 if (dot_or_dot_dot(de->d_name))
943ef07c
LP
1475 continue;
1476
1477 r = parse_ifindex(de->d_name, &ifindex);
1478 if (r < 0) /* Probably some temporary file from a previous run. Delete it */
1479 goto rm;
1480
1481 l = hashmap_get(m->links, INT_TO_PTR(ifindex));
1482 if (!l) /* link vanished */
1483 goto rm;
1484
1485 if (l->is_managed) /* now managed by networkd, hence the bus settings are useless */
1486 goto rm;
1487
1488 continue;
1489
1490 rm:
1491 p = strappend("/run/systemd/resolve/netif/", de->d_name);
1492 if (!p) {
1493 log_oom();
1494 return;
1495 }
1496
1497 (void) unlink(p);
1498 }
1499}
e7c1b0e4
DR
1500
1501bool manager_next_dnssd_names(Manager *m) {
1502 Iterator i;
1503 DnssdService *s;
1504 bool tried = false;
1505 int r;
1506
1507 assert(m);
1508
1509 HASHMAP_FOREACH(s, m->dnssd_services, i) {
1510 _cleanup_free_ char * new_name = NULL;
1511
1512 if (!s->withdrawn)
1513 continue;
1514
1515 r = manager_next_random_name(s->name_template, &new_name);
1516 if (r < 0) {
1517 log_warning_errno(r, "Failed to get new name for service '%s': %m", s->name);
1518 continue;
1519 }
1520
1521 free_and_replace(s->name_template, new_name);
1522
1523 s->withdrawn = false;
1524
1525 tried = true;
1526 }
1527
1528 if (tried)
1529 manager_refresh_rrs(m);
1530
1531 return tried;
1532}