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resolve: allow configurable bind address
[thirdparty/systemd.git] / src / resolve / resolved-manager.c
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1/* SPDX-License-Identifier: LGPL-2.1+ */
2
3#include <fcntl.h>
4#include <netinet/in.h>
5#include <poll.h>
6#include <sys/ioctl.h>
7#include <sys/stat.h>
8#include <sys/types.h>
9#include <unistd.h>
10
11#if HAVE_LIBIDN2
12#include <idn2.h>
13#endif
14
15#include "af-list.h"
16#include "alloc-util.h"
17#include "bus-polkit.h"
18#include "dirent-util.h"
19#include "dns-domain.h"
20#include "fd-util.h"
21#include "fileio.h"
22#include "hostname-util.h"
23#include "io-util.h"
24#include "missing_network.h"
25#include "netlink-util.h"
26#include "network-internal.h"
27#include "ordered-set.h"
28#include "parse-util.h"
29#include "random-util.h"
30#include "resolved-bus.h"
31#include "resolved-conf.h"
32#include "resolved-dns-stub.h"
33#include "resolved-dnssd.h"
34#include "resolved-etc-hosts.h"
35#include "resolved-llmnr.h"
36#include "resolved-manager.h"
37#include "resolved-mdns.h"
38#include "resolved-resolv-conf.h"
39#include "resolved-varlink.h"
40#include "socket-util.h"
41#include "string-table.h"
42#include "string-util.h"
43#include "utf8.h"
44
45#define SEND_TIMEOUT_USEC (200 * USEC_PER_MSEC)
46
47static int manager_process_link(sd_netlink *rtnl, sd_netlink_message *mm, void *userdata) {
48 Manager *m = userdata;
49 uint16_t type;
50 Link *l;
51 int ifindex, r;
52
53 assert(rtnl);
54 assert(m);
55 assert(mm);
56
57 r = sd_netlink_message_get_type(mm, &type);
58 if (r < 0)
59 goto fail;
60
61 r = sd_rtnl_message_link_get_ifindex(mm, &ifindex);
62 if (r < 0)
63 goto fail;
64
65 l = hashmap_get(m->links, INT_TO_PTR(ifindex));
66
67 switch (type) {
68
69 case RTM_NEWLINK:{
70 bool is_new = !l;
71
72 if (!l) {
73 r = link_new(m, &l, ifindex);
74 if (r < 0)
75 goto fail;
76 }
77
78 r = link_process_rtnl(l, mm);
79 if (r < 0)
80 goto fail;
81
82 r = link_update(l);
83 if (r < 0)
84 goto fail;
85
86 if (is_new)
87 log_debug("Found new link %i/%s", ifindex, l->ifname);
88
89 break;
90 }
91
92 case RTM_DELLINK:
93 if (l) {
94 log_debug("Removing link %i/%s", l->ifindex, l->ifname);
95 link_remove_user(l);
96 link_free(l);
97 }
98
99 break;
100 }
101
102 return 0;
103
104fail:
105 log_warning_errno(r, "Failed to process RTNL link message: %m");
106 return 0;
107}
108
109static int manager_process_address(sd_netlink *rtnl, sd_netlink_message *mm, void *userdata) {
110 Manager *m = userdata;
111 union in_addr_union address;
112 uint16_t type;
113 int r, ifindex, family;
114 LinkAddress *a;
115 Link *l;
116
117 assert(rtnl);
118 assert(mm);
119 assert(m);
120
121 r = sd_netlink_message_get_type(mm, &type);
122 if (r < 0)
123 goto fail;
124
125 r = sd_rtnl_message_addr_get_ifindex(mm, &ifindex);
126 if (r < 0)
127 goto fail;
128
129 l = hashmap_get(m->links, INT_TO_PTR(ifindex));
130 if (!l)
131 return 0;
132
133 r = sd_rtnl_message_addr_get_family(mm, &family);
134 if (r < 0)
135 goto fail;
136
137 switch (family) {
138
139 case AF_INET:
140 r = sd_netlink_message_read_in_addr(mm, IFA_LOCAL, &address.in);
141 if (r < 0) {
142 r = sd_netlink_message_read_in_addr(mm, IFA_ADDRESS, &address.in);
143 if (r < 0)
144 goto fail;
145 }
146
147 break;
148
149 case AF_INET6:
150 r = sd_netlink_message_read_in6_addr(mm, IFA_LOCAL, &address.in6);
151 if (r < 0) {
152 r = sd_netlink_message_read_in6_addr(mm, IFA_ADDRESS, &address.in6);
153 if (r < 0)
154 goto fail;
155 }
156
157 break;
158
159 default:
160 return 0;
161 }
162
163 a = link_find_address(l, family, &address);
164
165 switch (type) {
166
167 case RTM_NEWADDR:
168
169 if (!a) {
170 r = link_address_new(l, &a, family, &address);
171 if (r < 0)
172 return r;
173 }
174
175 r = link_address_update_rtnl(a, mm);
176 if (r < 0)
177 return r;
178
179 break;
180
181 case RTM_DELADDR:
182 link_address_free(a);
183 break;
184 }
185
186 return 0;
187
188fail:
189 log_warning_errno(r, "Failed to process RTNL address message: %m");
190 return 0;
191}
192
193static int manager_rtnl_listen(Manager *m) {
194 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL;
195 sd_netlink_message *i;
196 int r;
197
198 assert(m);
199
200 /* First, subscribe to interfaces coming and going */
201 r = sd_netlink_open(&m->rtnl);
202 if (r < 0)
203 return r;
204
205 r = sd_netlink_attach_event(m->rtnl, m->event, SD_EVENT_PRIORITY_IMPORTANT);
206 if (r < 0)
207 return r;
208
209 r = sd_netlink_add_match(m->rtnl, NULL, RTM_NEWLINK, manager_process_link, NULL, m, "resolve-NEWLINK");
210 if (r < 0)
211 return r;
212
213 r = sd_netlink_add_match(m->rtnl, NULL, RTM_DELLINK, manager_process_link, NULL, m, "resolve-DELLINK");
214 if (r < 0)
215 return r;
216
217 r = sd_netlink_add_match(m->rtnl, NULL, RTM_NEWADDR, manager_process_address, NULL, m, "resolve-NEWADDR");
218 if (r < 0)
219 return r;
220
221 r = sd_netlink_add_match(m->rtnl, NULL, RTM_DELADDR, manager_process_address, NULL, m, "resolve-DELADDR");
222 if (r < 0)
223 return r;
224
225 /* Then, enumerate all links */
226 r = sd_rtnl_message_new_link(m->rtnl, &req, RTM_GETLINK, 0);
227 if (r < 0)
228 return r;
229
230 r = sd_netlink_message_request_dump(req, true);
231 if (r < 0)
232 return r;
233
234 r = sd_netlink_call(m->rtnl, req, 0, &reply);
235 if (r < 0)
236 return r;
237
238 for (i = reply; i; i = sd_netlink_message_next(i)) {
239 r = manager_process_link(m->rtnl, i, m);
240 if (r < 0)
241 return r;
242 }
243
244 req = sd_netlink_message_unref(req);
245 reply = sd_netlink_message_unref(reply);
246
247 /* Finally, enumerate all addresses, too */
248 r = sd_rtnl_message_new_addr(m->rtnl, &req, RTM_GETADDR, 0, AF_UNSPEC);
249 if (r < 0)
250 return r;
251
252 r = sd_netlink_message_request_dump(req, true);
253 if (r < 0)
254 return r;
255
256 r = sd_netlink_call(m->rtnl, req, 0, &reply);
257 if (r < 0)
258 return r;
259
260 for (i = reply; i; i = sd_netlink_message_next(i)) {
261 r = manager_process_address(m->rtnl, i, m);
262 if (r < 0)
263 return r;
264 }
265
266 return r;
267}
268
269static int on_network_event(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
270 Manager *m = userdata;
271 Iterator i;
272 Link *l;
273 int r;
274
275 assert(m);
276
277 sd_network_monitor_flush(m->network_monitor);
278
279 HASHMAP_FOREACH(l, m->links, i) {
280 r = link_update(l);
281 if (r < 0)
282 log_warning_errno(r, "Failed to update monitor information for %i: %m", l->ifindex);
283 }
284
285 (void) manager_write_resolv_conf(m);
286 (void) manager_send_changed(m, "DNS");
287
288 return 0;
289}
290
291static int manager_network_monitor_listen(Manager *m) {
292 int r, fd, events;
293
294 assert(m);
295
296 r = sd_network_monitor_new(&m->network_monitor, NULL);
297 if (r < 0)
298 return r;
299
300 fd = sd_network_monitor_get_fd(m->network_monitor);
301 if (fd < 0)
302 return fd;
303
304 events = sd_network_monitor_get_events(m->network_monitor);
305 if (events < 0)
306 return events;
307
308 r = sd_event_add_io(m->event, &m->network_event_source, fd, events, &on_network_event, m);
309 if (r < 0)
310 return r;
311
312 r = sd_event_source_set_priority(m->network_event_source, SD_EVENT_PRIORITY_IMPORTANT+5);
313 if (r < 0)
314 return r;
315
316 (void) sd_event_source_set_description(m->network_event_source, "network-monitor");
317
318 return 0;
319}
320
321static int determine_hostname(char **full_hostname, char **llmnr_hostname, char **mdns_hostname) {
322 _cleanup_free_ char *h = NULL, *n = NULL;
323#if HAVE_LIBIDN2
324 _cleanup_free_ char *utf8 = NULL;
325#elif HAVE_LIBIDN
326 int k;
327#endif
328 char label[DNS_LABEL_MAX];
329 const char *p, *decoded;
330 int r;
331
332 assert(full_hostname);
333 assert(llmnr_hostname);
334 assert(mdns_hostname);
335
336 /* Extract and normalize the first label of the locally configured hostname, and check it's not "localhost". */
337
338 r = gethostname_strict(&h);
339 if (r < 0)
340 return log_debug_errno(r, "Can't determine system hostname: %m");
341
342 p = h;
343 r = dns_label_unescape(&p, label, sizeof label, 0);
344 if (r < 0)
345 return log_error_errno(r, "Failed to unescape hostname: %m");
346 if (r == 0)
347 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
348 "Couldn't find a single label in hostname.");
349
350#if HAVE_LIBIDN2
351 r = idn2_to_unicode_8z8z(label, &utf8, 0);
352 if (r != IDN2_OK)
353 return log_error("Failed to undo IDNA: %s", idn2_strerror(r));
354 assert(utf8_is_valid(utf8));
355
356 r = strlen(utf8);
357 decoded = utf8;
358#elif HAVE_LIBIDN
359 k = dns_label_undo_idna(label, r, label, sizeof label);
360 if (k < 0)
361 return log_error_errno(k, "Failed to undo IDNA: %m");
362 if (k > 0)
363 r = k;
364
365 if (!utf8_is_valid(label))
366 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
367 "System hostname is not UTF-8 clean.");
368 decoded = label;
369#else
370 decoded = label; /* no decoding */
371#endif
372
373 r = dns_label_escape_new(decoded, r, &n);
374 if (r < 0)
375 return log_error_errno(r, "Failed to escape hostname: %m");
376
377 if (is_localhost(n))
378 return log_debug_errno(SYNTHETIC_ERRNO(EINVAL),
379 "System hostname is 'localhost', ignoring.");
380
381 r = dns_name_concat(n, "local", 0, mdns_hostname);
382 if (r < 0)
383 return log_error_errno(r, "Failed to determine mDNS hostname: %m");
384
385 *llmnr_hostname = TAKE_PTR(n);
386 *full_hostname = TAKE_PTR(h);
387
388 return 0;
389}
390
391static const char *fallback_hostname(void) {
392
393 /* Determine the fall back hostname. For exposing this system to the outside world, we cannot have it to be
394 * "localhost" even if that's the compiled in hostname. In this case, let's revert to "linux" instead. */
395
396 if (is_localhost(FALLBACK_HOSTNAME))
397 return "linux";
398
399 return FALLBACK_HOSTNAME;
400}
401
402static int make_fallback_hostnames(char **full_hostname, char **llmnr_hostname, char **mdns_hostname) {
403 _cleanup_free_ char *n = NULL, *m = NULL;
404 char label[DNS_LABEL_MAX], *h;
405 const char *p;
406 int r;
407
408 assert(full_hostname);
409 assert(llmnr_hostname);
410 assert(mdns_hostname);
411
412 p = fallback_hostname();
413 r = dns_label_unescape(&p, label, sizeof label, 0);
414 if (r < 0)
415 return log_error_errno(r, "Failed to unescape fallback hostname: %m");
416
417 assert(r > 0); /* The fallback hostname must have at least one label */
418
419 r = dns_label_escape_new(label, r, &n);
420 if (r < 0)
421 return log_error_errno(r, "Failed to escape fallback hostname: %m");
422
423 r = dns_name_concat(n, "local", 0, &m);
424 if (r < 0)
425 return log_error_errno(r, "Failed to concatenate mDNS hostname: %m");
426
427 h = strdup(fallback_hostname());
428 if (!h)
429 return log_oom();
430
431 *llmnr_hostname = TAKE_PTR(n);
432 *mdns_hostname = TAKE_PTR(m);
433
434 *full_hostname = h;
435
436 return 0;
437}
438
439static int on_hostname_change(sd_event_source *es, int fd, uint32_t revents, void *userdata) {
440 _cleanup_free_ char *full_hostname = NULL, *llmnr_hostname = NULL, *mdns_hostname = NULL;
441 Manager *m = userdata;
442 bool llmnr_hostname_changed;
443 int r;
444
445 assert(m);
446
447 r = determine_hostname(&full_hostname, &llmnr_hostname, &mdns_hostname);
448 if (r < 0)
449 return 0; /* ignore invalid hostnames */
450
451 llmnr_hostname_changed = !streq(llmnr_hostname, m->llmnr_hostname);
452 if (streq(full_hostname, m->full_hostname) &&
453 !llmnr_hostname_changed &&
454 streq(mdns_hostname, m->mdns_hostname))
455 return 0;
456
457 log_info("System hostname changed to '%s'.", full_hostname);
458
459 free_and_replace(m->full_hostname, full_hostname);
460 free_and_replace(m->llmnr_hostname, llmnr_hostname);
461 free_and_replace(m->mdns_hostname, mdns_hostname);
462
463 manager_refresh_rrs(m);
464 (void) manager_send_changed(m, "LLMNRHostname");
465
466 return 0;
467}
468
469static int manager_watch_hostname(Manager *m) {
470 int r;
471
472 assert(m);
473
474 m->hostname_fd = open("/proc/sys/kernel/hostname",
475 O_RDONLY|O_CLOEXEC|O_NONBLOCK|O_NOCTTY);
476 if (m->hostname_fd < 0) {
477 log_warning_errno(errno, "Failed to watch hostname: %m");
478 return 0;
479 }
480
481 r = sd_event_add_io(m->event, &m->hostname_event_source, m->hostname_fd, 0, on_hostname_change, m);
482 if (r < 0) {
483 if (r == -EPERM)
484 /* kernels prior to 3.2 don't support polling this file. Ignore the failure. */
485 m->hostname_fd = safe_close(m->hostname_fd);
486 else
487 return log_error_errno(r, "Failed to add hostname event source: %m");
488 }
489
490 (void) sd_event_source_set_description(m->hostname_event_source, "hostname");
491
492 r = determine_hostname(&m->full_hostname, &m->llmnr_hostname, &m->mdns_hostname);
493 if (r < 0) {
494 log_info("Defaulting to hostname '%s'.", fallback_hostname());
495
496 r = make_fallback_hostnames(&m->full_hostname, &m->llmnr_hostname, &m->mdns_hostname);
497 if (r < 0)
498 return r;
499 } else
500 log_info("Using system hostname '%s'.", m->full_hostname);
501
502 return 0;
503}
504
505static int manager_sigusr1(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
506 _cleanup_free_ char *buffer = NULL;
507 _cleanup_fclose_ FILE *f = NULL;
508 Manager *m = userdata;
509 DnsServer *server;
510 size_t size = 0;
511 DnsScope *scope;
512 Iterator i;
513 Link *l;
514
515 assert(s);
516 assert(si);
517 assert(m);
518
519 f = open_memstream_unlocked(&buffer, &size);
520 if (!f)
521 return log_oom();
522
523 LIST_FOREACH(scopes, scope, m->dns_scopes)
524 dns_scope_dump(scope, f);
525
526 LIST_FOREACH(servers, server, m->dns_servers)
527 dns_server_dump(server, f);
528 LIST_FOREACH(servers, server, m->fallback_dns_servers)
529 dns_server_dump(server, f);
530 HASHMAP_FOREACH(l, m->links, i)
531 LIST_FOREACH(servers, server, l->dns_servers)
532 dns_server_dump(server, f);
533
534 if (fflush_and_check(f) < 0)
535 return log_oom();
536
537 log_dump(LOG_INFO, buffer);
538 return 0;
539}
540
541static int manager_sigusr2(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
542 Manager *m = userdata;
543
544 assert(s);
545 assert(si);
546 assert(m);
547
548 manager_flush_caches(m);
549
550 return 0;
551}
552
553static int manager_sigrtmin1(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
554 Manager *m = userdata;
555
556 assert(s);
557 assert(si);
558 assert(m);
559
560 manager_reset_server_features(m);
561 return 0;
562}
563
564int manager_new(Manager **ret) {
565 _cleanup_(manager_freep) Manager *m = NULL;
566 int r;
567
568 assert(ret);
569
570 m = new(Manager, 1);
571 if (!m)
572 return -ENOMEM;
573
574 *m = (Manager) {
575 .llmnr_ipv4_udp_fd = -1,
576 .llmnr_ipv6_udp_fd = -1,
577 .llmnr_ipv4_tcp_fd = -1,
578 .llmnr_ipv6_tcp_fd = -1,
579 .mdns_ipv4_fd = -1,
580 .mdns_ipv6_fd = -1,
581 .dns_stub_udp_fd = -1,
582 .dns_stub_tcp_fd = -1,
583 .hostname_fd = -1,
584
585 .llmnr_support = DEFAULT_LLMNR_MODE,
586 .mdns_support = DEFAULT_MDNS_MODE,
587 .dnssec_mode = DEFAULT_DNSSEC_MODE,
588 .dns_over_tls_mode = DEFAULT_DNS_OVER_TLS_MODE,
589 .enable_cache = DNS_CACHE_MODE_YES,
590 .dns_stub_listener_mode = DNS_STUB_LISTENER_YES,
591 .read_resolv_conf = true,
592 .need_builtin_fallbacks = true,
593 .etc_hosts_last = USEC_INFINITY,
594 .etc_hosts_mtime = USEC_INFINITY,
595 .etc_hosts_ino = 0,
596 .etc_hosts_dev = 0,
597 .read_etc_hosts = true,
598 };
599
600 r = dns_trust_anchor_load(&m->trust_anchor);
601 if (r < 0)
602 return r;
603
604 r = manager_parse_config_file(m);
605 if (r < 0)
606 log_warning_errno(r, "Failed to parse configuration file: %m");
607
608#if ENABLE_DNS_OVER_TLS
609 r = dnstls_manager_init(m);
610 if (r < 0)
611 return r;
612#endif
613
614 r = sd_event_default(&m->event);
615 if (r < 0)
616 return r;
617
618 (void) sd_event_add_signal(m->event, NULL, SIGTERM, NULL, NULL);
619 (void) sd_event_add_signal(m->event, NULL, SIGINT, NULL, NULL);
620
621 (void) sd_event_set_watchdog(m->event, true);
622
623 r = manager_watch_hostname(m);
624 if (r < 0)
625 return r;
626
627 r = dnssd_load(m);
628 if (r < 0)
629 log_warning_errno(r, "Failed to load DNS-SD configuration files: %m");
630
631 r = dns_scope_new(m, &m->unicast_scope, NULL, DNS_PROTOCOL_DNS, AF_UNSPEC);
632 if (r < 0)
633 return r;
634
635 r = manager_network_monitor_listen(m);
636 if (r < 0)
637 return r;
638
639 r = manager_rtnl_listen(m);
640 if (r < 0)
641 return r;
642
643 r = manager_connect_bus(m);
644 if (r < 0)
645 return r;
646
647 (void) sd_event_add_signal(m->event, &m->sigusr1_event_source, SIGUSR1, manager_sigusr1, m);
648 (void) sd_event_add_signal(m->event, &m->sigusr2_event_source, SIGUSR2, manager_sigusr2, m);
649 (void) sd_event_add_signal(m->event, &m->sigrtmin1_event_source, SIGRTMIN+1, manager_sigrtmin1, m);
650
651 manager_cleanup_saved_user(m);
652
653 *ret = TAKE_PTR(m);
654
655 return 0;
656}
657
658int manager_start(Manager *m) {
659 int r;
660
661 assert(m);
662
663 r = manager_dns_stub_start(m);
664 if (r < 0)
665 return r;
666
667 r = manager_varlink_init(m);
668 if (r < 0)
669 return r;
670
671 return 0;
672}
673
674Manager *manager_free(Manager *m) {
675 Link *l;
676 DnssdService *s;
677
678 if (!m)
679 return NULL;
680
681 dns_server_unlink_all(m->dns_servers);
682 dns_server_unlink_all(m->fallback_dns_servers);
683 dns_search_domain_unlink_all(m->search_domains);
684
685 while ((l = hashmap_first(m->links)))
686 link_free(l);
687
688 while (m->dns_queries)
689 dns_query_free(m->dns_queries);
690
691 dns_scope_free(m->unicast_scope);
692
693 /* At this point only orphaned streams should remain. All others should have been freed already by their
694 * owners */
695 while (m->dns_streams)
696 dns_stream_unref(m->dns_streams);
697
698#if ENABLE_DNS_OVER_TLS
699 dnstls_manager_free(m);
700#endif
701
702 hashmap_free(m->links);
703 hashmap_free(m->dns_transactions);
704 ordered_set_free(m->dns_extra_stub_listeners);
705
706 sd_event_source_unref(m->network_event_source);
707 sd_network_monitor_unref(m->network_monitor);
708
709 sd_netlink_unref(m->rtnl);
710 sd_event_source_unref(m->rtnl_event_source);
711
712 manager_llmnr_stop(m);
713 manager_mdns_stop(m);
714 manager_dns_stub_stop(m);
715 manager_varlink_done(m);
716
717 manager_dns_stub_stop_extra(m);
718
719 bus_verify_polkit_async_registry_free(m->polkit_registry);
720
721 sd_bus_flush_close_unref(m->bus);
722
723 sd_event_source_unref(m->sigusr1_event_source);
724 sd_event_source_unref(m->sigusr2_event_source);
725 sd_event_source_unref(m->sigrtmin1_event_source);
726
727 sd_event_unref(m->event);
728
729 dns_resource_key_unref(m->llmnr_host_ipv4_key);
730 dns_resource_key_unref(m->llmnr_host_ipv6_key);
731 dns_resource_key_unref(m->mdns_host_ipv4_key);
732 dns_resource_key_unref(m->mdns_host_ipv6_key);
733
734 sd_event_source_unref(m->hostname_event_source);
735 safe_close(m->hostname_fd);
736
737 free(m->full_hostname);
738 free(m->llmnr_hostname);
739 free(m->mdns_hostname);
740
741 while ((s = hashmap_first(m->dnssd_services)))
742 dnssd_service_free(s);
743 hashmap_free(m->dnssd_services);
744
745 dns_trust_anchor_flush(&m->trust_anchor);
746 manager_etc_hosts_flush(m);
747
748 return mfree(m);
749}
750
751int manager_recv(Manager *m, int fd, DnsProtocol protocol, DnsPacket **ret) {
752 _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL;
753 CMSG_BUFFER_TYPE(CMSG_SPACE(MAXSIZE(struct in_pktinfo, struct in6_pktinfo))
754 + CMSG_SPACE(int) /* ttl/hoplimit */
755 + EXTRA_CMSG_SPACE /* kernel appears to require extra buffer space */) control;
756 union sockaddr_union sa;
757 struct iovec iov;
758 struct msghdr mh = {
759 .msg_name = &sa.sa,
760 .msg_namelen = sizeof(sa),
761 .msg_iov = &iov,
762 .msg_iovlen = 1,
763 .msg_control = &control,
764 .msg_controllen = sizeof(control),
765 };
766 struct cmsghdr *cmsg;
767 ssize_t ms, l;
768 int r;
769
770 assert(m);
771 assert(fd >= 0);
772 assert(ret);
773
774 ms = next_datagram_size_fd(fd);
775 if (ms < 0)
776 return ms;
777
778 r = dns_packet_new(&p, protocol, ms, DNS_PACKET_SIZE_MAX);
779 if (r < 0)
780 return r;
781
782 iov = IOVEC_MAKE(DNS_PACKET_DATA(p), p->allocated);
783
784 l = recvmsg_safe(fd, &mh, 0);
785 if (IN_SET(l, -EAGAIN, -EINTR))
786 return 0;
787 if (l < 0)
788 return l;
789 if (l == 0)
790 return 0;
791
792 assert(!(mh.msg_flags & MSG_TRUNC));
793
794 p->size = (size_t) l;
795
796 p->family = sa.sa.sa_family;
797 p->ipproto = IPPROTO_UDP;
798 if (p->family == AF_INET) {
799 p->sender.in = sa.in.sin_addr;
800 p->sender_port = be16toh(sa.in.sin_port);
801 } else if (p->family == AF_INET6) {
802 p->sender.in6 = sa.in6.sin6_addr;
803 p->sender_port = be16toh(sa.in6.sin6_port);
804 p->ifindex = sa.in6.sin6_scope_id;
805 } else
806 return -EAFNOSUPPORT;
807
808 CMSG_FOREACH(cmsg, &mh) {
809
810 if (cmsg->cmsg_level == IPPROTO_IPV6) {
811 assert(p->family == AF_INET6);
812
813 switch (cmsg->cmsg_type) {
814
815 case IPV6_PKTINFO: {
816 struct in6_pktinfo *i = (struct in6_pktinfo*) CMSG_DATA(cmsg);
817
818 if (p->ifindex <= 0)
819 p->ifindex = i->ipi6_ifindex;
820
821 p->destination.in6 = i->ipi6_addr;
822 break;
823 }
824
825 case IPV6_HOPLIMIT:
826 p->ttl = *(int *) CMSG_DATA(cmsg);
827 break;
828
829 }
830 } else if (cmsg->cmsg_level == IPPROTO_IP) {
831 assert(p->family == AF_INET);
832
833 switch (cmsg->cmsg_type) {
834
835 case IP_PKTINFO: {
836 struct in_pktinfo *i = (struct in_pktinfo*) CMSG_DATA(cmsg);
837
838 if (p->ifindex <= 0)
839 p->ifindex = i->ipi_ifindex;
840
841 p->destination.in = i->ipi_addr;
842 break;
843 }
844
845 case IP_TTL:
846 p->ttl = *(int *) CMSG_DATA(cmsg);
847 break;
848 }
849 }
850 }
851
852 /* The Linux kernel sets the interface index to the loopback
853 * device if the packet came from the local host since it
854 * avoids the routing table in such a case. Let's unset the
855 * interface index in such a case. */
856 if (p->ifindex == LOOPBACK_IFINDEX)
857 p->ifindex = 0;
858
859 if (protocol != DNS_PROTOCOL_DNS) {
860 /* If we don't know the interface index still, we look for the
861 * first local interface with a matching address. Yuck! */
862 if (p->ifindex <= 0)
863 p->ifindex = manager_find_ifindex(m, p->family, &p->destination);
864 }
865
866 *ret = TAKE_PTR(p);
867
868 return 1;
869}
870
871static int sendmsg_loop(int fd, struct msghdr *mh, int flags) {
872 int r;
873
874 assert(fd >= 0);
875 assert(mh);
876
877 for (;;) {
878 if (sendmsg(fd, mh, flags) >= 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
895static int write_loop(int fd, void *message, size_t length) {
896 int r;
897
898 assert(fd >= 0);
899 assert(message);
900
901 for (;;) {
902 if (write(fd, message, length) >= 0)
903 return 0;
904
905 if (errno == EINTR)
906 continue;
907
908 if (errno != EAGAIN)
909 return -errno;
910
911 r = fd_wait_for_event(fd, POLLOUT, SEND_TIMEOUT_USEC);
912 if (r < 0)
913 return r;
914 if (r == 0)
915 return -ETIMEDOUT;
916 }
917}
918
919int manager_write(Manager *m, int fd, DnsPacket *p) {
920 int r;
921
922 log_debug("Sending %s packet with id %" PRIu16 ".", DNS_PACKET_QR(p) ? "response" : "query", DNS_PACKET_ID(p));
923
924 r = write_loop(fd, DNS_PACKET_DATA(p), p->size);
925 if (r < 0)
926 return r;
927
928 return 0;
929}
930
931static int manager_ipv4_send(
932 Manager *m,
933 int fd,
934 int ifindex,
935 const struct in_addr *destination,
936 uint16_t port,
937 const struct in_addr *source,
938 DnsPacket *p) {
939
940 CMSG_BUFFER_TYPE(CMSG_SPACE(sizeof(struct in_pktinfo))) control = {};
941 union sockaddr_union sa;
942 struct iovec iov;
943 struct msghdr mh = {
944 .msg_iov = &iov,
945 .msg_iovlen = 1,
946 .msg_name = &sa.sa,
947 .msg_namelen = sizeof(sa.in),
948 };
949
950 assert(m);
951 assert(fd >= 0);
952 assert(destination);
953 assert(port > 0);
954 assert(p);
955
956 iov = IOVEC_MAKE(DNS_PACKET_DATA(p), p->size);
957
958 sa = (union sockaddr_union) {
959 .in.sin_family = AF_INET,
960 .in.sin_addr = *destination,
961 .in.sin_port = htobe16(port),
962 };
963
964 if (ifindex > 0) {
965 struct cmsghdr *cmsg;
966 struct in_pktinfo *pi;
967
968 mh.msg_control = &control;
969 mh.msg_controllen = sizeof(control);
970
971 cmsg = CMSG_FIRSTHDR(&mh);
972 cmsg->cmsg_len = CMSG_LEN(sizeof(struct in_pktinfo));
973 cmsg->cmsg_level = IPPROTO_IP;
974 cmsg->cmsg_type = IP_PKTINFO;
975
976 pi = (struct in_pktinfo*) CMSG_DATA(cmsg);
977 pi->ipi_ifindex = ifindex;
978
979 if (source)
980 pi->ipi_spec_dst = *source;
981 }
982
983 return sendmsg_loop(fd, &mh, 0);
984}
985
986static int manager_ipv6_send(
987 Manager *m,
988 int fd,
989 int ifindex,
990 const struct in6_addr *destination,
991 uint16_t port,
992 const struct in6_addr *source,
993 DnsPacket *p) {
994
995 CMSG_BUFFER_TYPE(CMSG_SPACE(sizeof(struct in6_pktinfo))) control = {};
996 union sockaddr_union sa;
997 struct iovec iov;
998 struct msghdr mh = {
999 .msg_iov = &iov,
1000 .msg_iovlen = 1,
1001 .msg_name = &sa.sa,
1002 .msg_namelen = sizeof(sa.in6),
1003 };
1004
1005 assert(m);
1006 assert(fd >= 0);
1007 assert(destination);
1008 assert(port > 0);
1009 assert(p);
1010
1011 iov = IOVEC_MAKE(DNS_PACKET_DATA(p), p->size);
1012
1013 sa = (union sockaddr_union) {
1014 .in6.sin6_family = AF_INET6,
1015 .in6.sin6_addr = *destination,
1016 .in6.sin6_port = htobe16(port),
1017 .in6.sin6_scope_id = ifindex,
1018 };
1019
1020 if (ifindex > 0) {
1021 struct cmsghdr *cmsg;
1022 struct in6_pktinfo *pi;
1023
1024 mh.msg_control = &control;
1025 mh.msg_controllen = sizeof(control);
1026
1027 cmsg = CMSG_FIRSTHDR(&mh);
1028 cmsg->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
1029 cmsg->cmsg_level = IPPROTO_IPV6;
1030 cmsg->cmsg_type = IPV6_PKTINFO;
1031
1032 pi = (struct in6_pktinfo*) CMSG_DATA(cmsg);
1033 pi->ipi6_ifindex = ifindex;
1034
1035 if (source)
1036 pi->ipi6_addr = *source;
1037 }
1038
1039 return sendmsg_loop(fd, &mh, 0);
1040}
1041
1042int manager_send(
1043 Manager *m,
1044 int fd,
1045 int ifindex,
1046 int family,
1047 const union in_addr_union *destination,
1048 uint16_t port,
1049 const union in_addr_union *source,
1050 DnsPacket *p) {
1051
1052 assert(m);
1053 assert(fd >= 0);
1054 assert(destination);
1055 assert(port > 0);
1056 assert(p);
1057
1058 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));
1059
1060 if (family == AF_INET)
1061 return manager_ipv4_send(m, fd, ifindex, &destination->in, port, source ? &source->in : NULL, p);
1062 if (family == AF_INET6)
1063 return manager_ipv6_send(m, fd, ifindex, &destination->in6, port, source ? &source->in6 : NULL, p);
1064
1065 return -EAFNOSUPPORT;
1066}
1067
1068uint32_t manager_find_mtu(Manager *m) {
1069 uint32_t mtu = 0;
1070 Link *l;
1071 Iterator i;
1072
1073 /* If we don't know on which link a DNS packet would be
1074 * delivered, let's find the largest MTU that works on all
1075 * interfaces we know of */
1076
1077 HASHMAP_FOREACH(l, m->links, i) {
1078 if (l->mtu <= 0)
1079 continue;
1080
1081 if (mtu <= 0 || l->mtu < mtu)
1082 mtu = l->mtu;
1083 }
1084
1085 return mtu;
1086}
1087
1088int manager_find_ifindex(Manager *m, int family, const union in_addr_union *in_addr) {
1089 LinkAddress *a;
1090
1091 assert(m);
1092
1093 a = manager_find_link_address(m, family, in_addr);
1094 if (a)
1095 return a->link->ifindex;
1096
1097 return 0;
1098}
1099
1100void manager_refresh_rrs(Manager *m) {
1101 Iterator i;
1102 Link *l;
1103 DnssdService *s;
1104
1105 assert(m);
1106
1107 m->llmnr_host_ipv4_key = dns_resource_key_unref(m->llmnr_host_ipv4_key);
1108 m->llmnr_host_ipv6_key = dns_resource_key_unref(m->llmnr_host_ipv6_key);
1109 m->mdns_host_ipv4_key = dns_resource_key_unref(m->mdns_host_ipv4_key);
1110 m->mdns_host_ipv6_key = dns_resource_key_unref(m->mdns_host_ipv6_key);
1111
1112 if (m->mdns_support == RESOLVE_SUPPORT_YES)
1113 HASHMAP_FOREACH(s, m->dnssd_services, i)
1114 if (dnssd_update_rrs(s) < 0)
1115 log_warning("Failed to refresh DNS-SD service '%s'", s->name);
1116
1117 HASHMAP_FOREACH(l, m->links, i) {
1118 link_add_rrs(l, true);
1119 link_add_rrs(l, false);
1120 }
1121}
1122
1123static int manager_next_random_name(const char *old, char **ret_new) {
1124 const char *p;
1125 uint64_t u, a;
1126 char *n;
1127
1128 p = strchr(old, 0);
1129 assert(p);
1130
1131 while (p > old) {
1132 if (!strchr(DIGITS, p[-1]))
1133 break;
1134
1135 p--;
1136 }
1137
1138 if (*p == 0 || safe_atou64(p, &u) < 0 || u <= 0)
1139 u = 1;
1140
1141 /* Add a random number to the old value. This way we can avoid
1142 * that two hosts pick the same hostname, win on IPv4 and lose
1143 * on IPv6 (or vice versa), and pick the same hostname
1144 * replacement hostname, ad infinitum. We still want the
1145 * numbers to go up monotonically, hence we just add a random
1146 * value 1..10 */
1147
1148 random_bytes(&a, sizeof(a));
1149 u += 1 + a % 10;
1150
1151 if (asprintf(&n, "%.*s%" PRIu64, (int) (p - old), old, u) < 0)
1152 return -ENOMEM;
1153
1154 *ret_new = n;
1155
1156 return 0;
1157}
1158
1159int manager_next_hostname(Manager *m) {
1160 _cleanup_free_ char *h = NULL, *k = NULL;
1161 int r;
1162
1163 assert(m);
1164
1165 r = manager_next_random_name(m->llmnr_hostname, &h);
1166 if (r < 0)
1167 return r;
1168
1169 r = dns_name_concat(h, "local", 0, &k);
1170 if (r < 0)
1171 return r;
1172
1173 log_info("Hostname conflict, changing published hostname from '%s' to '%s'.", m->llmnr_hostname, h);
1174
1175 free_and_replace(m->llmnr_hostname, h);
1176 free_and_replace(m->mdns_hostname, k);
1177
1178 manager_refresh_rrs(m);
1179 (void) manager_send_changed(m, "LLMNRHostname");
1180
1181 return 0;
1182}
1183
1184LinkAddress* manager_find_link_address(Manager *m, int family, const union in_addr_union *in_addr) {
1185 Iterator i;
1186 Link *l;
1187
1188 assert(m);
1189
1190 HASHMAP_FOREACH(l, m->links, i) {
1191 LinkAddress *a;
1192
1193 a = link_find_address(l, family, in_addr);
1194 if (a)
1195 return a;
1196 }
1197
1198 return NULL;
1199}
1200
1201bool manager_our_packet(Manager *m, DnsPacket *p) {
1202 assert(m);
1203 assert(p);
1204
1205 return !!manager_find_link_address(m, p->family, &p->sender);
1206}
1207
1208DnsScope* manager_find_scope(Manager *m, DnsPacket *p) {
1209 Link *l;
1210
1211 assert(m);
1212 assert(p);
1213
1214 l = hashmap_get(m->links, INT_TO_PTR(p->ifindex));
1215 if (!l)
1216 return NULL;
1217
1218 switch (p->protocol) {
1219 case DNS_PROTOCOL_LLMNR:
1220 if (p->family == AF_INET)
1221 return l->llmnr_ipv4_scope;
1222 else if (p->family == AF_INET6)
1223 return l->llmnr_ipv6_scope;
1224
1225 break;
1226
1227 case DNS_PROTOCOL_MDNS:
1228 if (p->family == AF_INET)
1229 return l->mdns_ipv4_scope;
1230 else if (p->family == AF_INET6)
1231 return l->mdns_ipv6_scope;
1232
1233 break;
1234
1235 default:
1236 break;
1237 }
1238
1239 return NULL;
1240}
1241
1242void manager_verify_all(Manager *m) {
1243 DnsScope *s;
1244
1245 assert(m);
1246
1247 LIST_FOREACH(scopes, s, m->dns_scopes)
1248 dns_zone_verify_all(&s->zone);
1249}
1250
1251int manager_is_own_hostname(Manager *m, const char *name) {
1252 int r;
1253
1254 assert(m);
1255 assert(name);
1256
1257 if (m->llmnr_hostname) {
1258 r = dns_name_equal(name, m->llmnr_hostname);
1259 if (r != 0)
1260 return r;
1261 }
1262
1263 if (m->mdns_hostname) {
1264 r = dns_name_equal(name, m->mdns_hostname);
1265 if (r != 0)
1266 return r;
1267 }
1268
1269 if (m->full_hostname)
1270 return dns_name_equal(name, m->full_hostname);
1271
1272 return 0;
1273}
1274
1275int manager_compile_dns_servers(Manager *m, OrderedSet **dns) {
1276 DnsServer *s;
1277 Iterator i;
1278 Link *l;
1279 int r;
1280
1281 assert(m);
1282 assert(dns);
1283
1284 r = ordered_set_ensure_allocated(dns, &dns_server_hash_ops);
1285 if (r < 0)
1286 return r;
1287
1288 /* First add the system-wide servers and domains */
1289 LIST_FOREACH(servers, s, m->dns_servers) {
1290 r = ordered_set_put(*dns, s);
1291 if (r == -EEXIST)
1292 continue;
1293 if (r < 0)
1294 return r;
1295 }
1296
1297 /* Then, add the per-link servers */
1298 HASHMAP_FOREACH(l, m->links, i) {
1299 LIST_FOREACH(servers, s, l->dns_servers) {
1300 r = ordered_set_put(*dns, s);
1301 if (r == -EEXIST)
1302 continue;
1303 if (r < 0)
1304 return r;
1305 }
1306 }
1307
1308 /* If we found nothing, add the fallback servers */
1309 if (ordered_set_isempty(*dns)) {
1310 LIST_FOREACH(servers, s, m->fallback_dns_servers) {
1311 r = ordered_set_put(*dns, s);
1312 if (r == -EEXIST)
1313 continue;
1314 if (r < 0)
1315 return r;
1316 }
1317 }
1318
1319 return 0;
1320}
1321
1322/* filter_route is a tri-state:
1323 * < 0: no filtering
1324 * = 0 or false: return only domains which should be used for searching
1325 * > 0 or true: return only domains which are for routing only
1326 */
1327int manager_compile_search_domains(Manager *m, OrderedSet **domains, int filter_route) {
1328 DnsSearchDomain *d;
1329 Iterator i;
1330 Link *l;
1331 int r;
1332
1333 assert(m);
1334 assert(domains);
1335
1336 r = ordered_set_ensure_allocated(domains, &dns_name_hash_ops);
1337 if (r < 0)
1338 return r;
1339
1340 LIST_FOREACH(domains, d, m->search_domains) {
1341
1342 if (filter_route >= 0 &&
1343 d->route_only != !!filter_route)
1344 continue;
1345
1346 r = ordered_set_put(*domains, d->name);
1347 if (r == -EEXIST)
1348 continue;
1349 if (r < 0)
1350 return r;
1351 }
1352
1353 HASHMAP_FOREACH(l, m->links, i) {
1354
1355 LIST_FOREACH(domains, d, l->search_domains) {
1356
1357 if (filter_route >= 0 &&
1358 d->route_only != !!filter_route)
1359 continue;
1360
1361 r = ordered_set_put(*domains, d->name);
1362 if (r == -EEXIST)
1363 continue;
1364 if (r < 0)
1365 return r;
1366 }
1367 }
1368
1369 return 0;
1370}
1371
1372DnssecMode manager_get_dnssec_mode(Manager *m) {
1373 assert(m);
1374
1375 if (m->dnssec_mode != _DNSSEC_MODE_INVALID)
1376 return m->dnssec_mode;
1377
1378 return DNSSEC_NO;
1379}
1380
1381bool manager_dnssec_supported(Manager *m) {
1382 DnsServer *server;
1383 Iterator i;
1384 Link *l;
1385
1386 assert(m);
1387
1388 if (manager_get_dnssec_mode(m) == DNSSEC_NO)
1389 return false;
1390
1391 server = manager_get_dns_server(m);
1392 if (server && !dns_server_dnssec_supported(server))
1393 return false;
1394
1395 HASHMAP_FOREACH(l, m->links, i)
1396 if (!link_dnssec_supported(l))
1397 return false;
1398
1399 return true;
1400}
1401
1402DnsOverTlsMode manager_get_dns_over_tls_mode(Manager *m) {
1403 assert(m);
1404
1405 if (m->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
1406 return m->dns_over_tls_mode;
1407
1408 return DNS_OVER_TLS_NO;
1409}
1410
1411void manager_dnssec_verdict(Manager *m, DnssecVerdict verdict, const DnsResourceKey *key) {
1412
1413 assert(verdict >= 0);
1414 assert(verdict < _DNSSEC_VERDICT_MAX);
1415
1416 if (DEBUG_LOGGING) {
1417 char s[DNS_RESOURCE_KEY_STRING_MAX];
1418
1419 log_debug("Found verdict for lookup %s: %s",
1420 dns_resource_key_to_string(key, s, sizeof s),
1421 dnssec_verdict_to_string(verdict));
1422 }
1423
1424 m->n_dnssec_verdict[verdict]++;
1425}
1426
1427bool manager_routable(Manager *m, int family) {
1428 Iterator i;
1429 Link *l;
1430
1431 assert(m);
1432
1433 /* Returns true if the host has at least one interface with a routable address of the specified type */
1434
1435 HASHMAP_FOREACH(l, m->links, i)
1436 if (link_relevant(l, family, false))
1437 return true;
1438
1439 return false;
1440}
1441
1442void manager_flush_caches(Manager *m) {
1443 DnsScope *scope;
1444
1445 assert(m);
1446
1447 LIST_FOREACH(scopes, scope, m->dns_scopes)
1448 dns_cache_flush(&scope->cache);
1449
1450 log_info("Flushed all caches.");
1451}
1452
1453void manager_reset_server_features(Manager *m) {
1454 Iterator i;
1455 Link *l;
1456
1457 dns_server_reset_features_all(m->dns_servers);
1458 dns_server_reset_features_all(m->fallback_dns_servers);
1459
1460 HASHMAP_FOREACH(l, m->links, i)
1461 dns_server_reset_features_all(l->dns_servers);
1462
1463 log_info("Resetting learnt feature levels on all servers.");
1464}
1465
1466void manager_cleanup_saved_user(Manager *m) {
1467 _cleanup_closedir_ DIR *d = NULL;
1468 struct dirent *de;
1469
1470 assert(m);
1471
1472 /* Clean up all saved per-link files in /run/systemd/resolve/netif/ that don't have a matching interface
1473 * anymore. These files are created to persist settings pushed in by the user via the bus, so that resolved can
1474 * be restarted without losing this data. */
1475
1476 d = opendir("/run/systemd/resolve/netif/");
1477 if (!d) {
1478 if (errno == ENOENT)
1479 return;
1480
1481 log_warning_errno(errno, "Failed to open interface directory: %m");
1482 return;
1483 }
1484
1485 FOREACH_DIRENT_ALL(de, d, log_error_errno(errno, "Failed to read interface directory: %m")) {
1486 _cleanup_free_ char *p = NULL;
1487 int ifindex;
1488 Link *l;
1489
1490 if (!IN_SET(de->d_type, DT_UNKNOWN, DT_REG))
1491 continue;
1492
1493 if (dot_or_dot_dot(de->d_name))
1494 continue;
1495
1496 ifindex = parse_ifindex(de->d_name);
1497 if (ifindex < 0) /* Probably some temporary file from a previous run. Delete it */
1498 goto rm;
1499
1500 l = hashmap_get(m->links, INT_TO_PTR(ifindex));
1501 if (!l) /* link vanished */
1502 goto rm;
1503
1504 if (l->is_managed) /* now managed by networkd, hence the bus settings are useless */
1505 goto rm;
1506
1507 continue;
1508
1509 rm:
1510 p = path_join("/run/systemd/resolve/netif", de->d_name);
1511 if (!p) {
1512 log_oom();
1513 return;
1514 }
1515
1516 (void) unlink(p);
1517 }
1518}
1519
1520bool manager_next_dnssd_names(Manager *m) {
1521 Iterator i;
1522 DnssdService *s;
1523 bool tried = false;
1524 int r;
1525
1526 assert(m);
1527
1528 HASHMAP_FOREACH(s, m->dnssd_services, i) {
1529 _cleanup_free_ char * new_name = NULL;
1530
1531 if (!s->withdrawn)
1532 continue;
1533
1534 r = manager_next_random_name(s->name_template, &new_name);
1535 if (r < 0) {
1536 log_warning_errno(r, "Failed to get new name for service '%s': %m", s->name);
1537 continue;
1538 }
1539
1540 free_and_replace(s->name_template, new_name);
1541
1542 s->withdrawn = false;
1543
1544 tried = true;
1545 }
1546
1547 if (tried)
1548 manager_refresh_rrs(m);
1549
1550 return tried;
1551}
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