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basic/log: add concept of "synthethic errnos"
[thirdparty/systemd.git] / src / resolve / resolved-manager.c
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1/* SPDX-License-Identifier: LGPL-2.1+ */
2
3#include <netinet/in.h>
4#include <poll.h>
5#include <stdio_ext.h>
6#include <sys/ioctl.h>
7
8#if HAVE_LIBIDN2
9#include <idn2.h>
10#endif
11
12#include "af-list.h"
13#include "alloc-util.h"
14#include "dirent-util.h"
15#include "dns-domain.h"
16#include "fd-util.h"
17#include "fileio-label.h"
18#include "hostname-util.h"
19#include "io-util.h"
20#include "netlink-util.h"
21#include "network-internal.h"
22#include "ordered-set.h"
23#include "parse-util.h"
24#include "random-util.h"
25#include "resolved-bus.h"
26#include "resolved-conf.h"
27#include "resolved-dnssd.h"
28#include "resolved-dns-stub.h"
29#include "resolved-etc-hosts.h"
30#include "resolved-llmnr.h"
31#include "resolved-manager.h"
32#include "resolved-mdns.h"
33#include "resolved-resolv-conf.h"
34#include "socket-util.h"
35#include "string-table.h"
36#include "string-util.h"
37#include "utf8.h"
38
39#define SEND_TIMEOUT_USEC (200 * USEC_PER_MSEC)
40
41static int manager_process_link(sd_netlink *rtnl, sd_netlink_message *mm, void *userdata) {
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
51 r = sd_netlink_message_get_type(mm, &type);
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
63 case RTM_NEWLINK:{
64 bool is_new = !l;
65
66 if (!l) {
67 r = link_new(m, &l, ifindex);
68 if (r < 0)
69 goto fail;
70 }
71
72 r = link_process_rtnl(l, mm);
73 if (r < 0)
74 goto fail;
75
76 r = link_update(l);
77 if (r < 0)
78 goto fail;
79
80 if (is_new)
81 log_debug("Found new link %i/%s", ifindex, l->name);
82
83 break;
84 }
85
86 case RTM_DELLINK:
87 if (l) {
88 log_debug("Removing link %i/%s", l->ifindex, l->name);
89 link_remove_user(l);
90 link_free(l);
91 }
92
93 break;
94 }
95
96 return 0;
97
98fail:
99 log_warning_errno(r, "Failed to process RTNL link message: %m");
100 return 0;
101}
102
103static int manager_process_address(sd_netlink *rtnl, sd_netlink_message *mm, void *userdata) {
104 Manager *m = userdata;
105 union in_addr_union address;
106 uint16_t type;
107 int r, ifindex, family;
108 LinkAddress *a;
109 Link *l;
110
111 assert(rtnl);
112 assert(mm);
113 assert(m);
114
115 r = sd_netlink_message_get_type(mm, &type);
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:
134 r = sd_netlink_message_read_in_addr(mm, IFA_LOCAL, &address.in);
135 if (r < 0) {
136 r = sd_netlink_message_read_in_addr(mm, IFA_ADDRESS, &address.in);
137 if (r < 0)
138 goto fail;
139 }
140
141 break;
142
143 case AF_INET6:
144 r = sd_netlink_message_read_in6_addr(mm, IFA_LOCAL, &address.in6);
145 if (r < 0) {
146 r = sd_netlink_message_read_in6_addr(mm, IFA_ADDRESS, &address.in6);
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:
176 link_address_free(a);
177 break;
178 }
179
180 return 0;
181
182fail:
183 log_warning_errno(r, "Failed to process RTNL address message: %m");
184 return 0;
185}
186
187static int manager_rtnl_listen(Manager *m) {
188 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL;
189 sd_netlink_message *i;
190 int r;
191
192 assert(m);
193
194 /* First, subscribe to interfaces coming and going */
195 r = sd_netlink_open(&m->rtnl);
196 if (r < 0)
197 return r;
198
199 r = sd_netlink_attach_event(m->rtnl, m->event, SD_EVENT_PRIORITY_IMPORTANT);
200 if (r < 0)
201 return r;
202
203 r = sd_netlink_add_match(m->rtnl, NULL, RTM_NEWLINK, manager_process_link, NULL, m, "resolve-NEWLINK");
204 if (r < 0)
205 return r;
206
207 r = sd_netlink_add_match(m->rtnl, NULL, RTM_DELLINK, manager_process_link, NULL, m, "resolve-DELLINK");
208 if (r < 0)
209 return r;
210
211 r = sd_netlink_add_match(m->rtnl, NULL, RTM_NEWADDR, manager_process_address, NULL, m, "resolve-NEWADDR");
212 if (r < 0)
213 return r;
214
215 r = sd_netlink_add_match(m->rtnl, NULL, RTM_DELADDR, manager_process_address, NULL, m, "resolve-DELADDR");
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
224 r = sd_netlink_message_request_dump(req, true);
225 if (r < 0)
226 return r;
227
228 r = sd_netlink_call(m->rtnl, req, 0, &reply);
229 if (r < 0)
230 return r;
231
232 for (i = reply; i; i = sd_netlink_message_next(i)) {
233 r = manager_process_link(m->rtnl, i, m);
234 if (r < 0)
235 return r;
236 }
237
238 req = sd_netlink_message_unref(req);
239 reply = sd_netlink_message_unref(reply);
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
246 r = sd_netlink_message_request_dump(req, true);
247 if (r < 0)
248 return r;
249
250 r = sd_netlink_call(m->rtnl, req, 0, &reply);
251 if (r < 0)
252 return r;
253
254 for (i = reply; i; i = sd_netlink_message_next(i)) {
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) {
274 r = link_update(l);
275 if (r < 0)
276 log_warning_errno(r, "Failed to update monitor information for %i: %m", l->ifindex);
277 }
278
279 (void) manager_write_resolv_conf(m);
280
281 return 0;
282}
283
284static int manager_network_monitor_listen(Manager *m) {
285 int r, fd, events;
286
287 assert(m);
288
289 r = sd_network_monitor_new(&m->network_monitor, NULL);
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)
303 return r;
304
305 r = sd_event_source_set_priority(m->network_event_source, SD_EVENT_PRIORITY_IMPORTANT+5);
306 if (r < 0)
307 return r;
308
309 (void) sd_event_source_set_description(m->network_event_source, "network-monitor");
310
311 return 0;
312}
313
314static int determine_hostname(char **full_hostname, char **llmnr_hostname, char **mdns_hostname) {
315 _cleanup_free_ char *h = NULL, *n = NULL;
316#if HAVE_LIBIDN2
317 _cleanup_free_ char *utf8 = NULL;
318#elif HAVE_LIBIDN
319 int k;
320#endif
321 char label[DNS_LABEL_MAX];
322 const char *p, *decoded;
323 int r;
324
325 assert(full_hostname);
326 assert(llmnr_hostname);
327 assert(mdns_hostname);
328
329 /* Extract and normalize the first label of the locally configured hostname, and check it's not "localhost". */
330
331 r = gethostname_strict(&h);
332 if (r < 0)
333 return log_debug_errno(r, "Can't determine system hostname: %m");
334
335 p = h;
336 r = dns_label_unescape(&p, label, sizeof label);
337 if (r < 0)
338 return log_error_errno(r, "Failed to unescape host name: %m");
339 if (r == 0) {
340 log_error("Couldn't find a single label in hostname.");
341 return -EINVAL;
342 }
343
344#if HAVE_LIBIDN2
345 r = idn2_to_unicode_8z8z(label, &utf8, 0);
346 if (r != IDN2_OK)
347 return log_error("Failed to undo IDNA: %s", idn2_strerror(r));
348 assert(utf8_is_valid(utf8));
349
350 r = strlen(utf8);
351 decoded = utf8;
352#elif HAVE_LIBIDN
353 k = dns_label_undo_idna(label, r, label, sizeof label);
354 if (k < 0)
355 return log_error_errno(k, "Failed to undo IDNA: %m");
356 if (k > 0)
357 r = k;
358
359 if (!utf8_is_valid(label)) {
360 log_error("System hostname is not UTF-8 clean.");
361 return -EINVAL;
362 }
363 decoded = label;
364#else
365 decoded = label; /* no decoding */
366#endif
367
368 r = dns_label_escape_new(decoded, r, &n);
369 if (r < 0)
370 return log_error_errno(r, "Failed to escape host name: %m");
371
372 if (is_localhost(n)) {
373 log_debug("System hostname is 'localhost', ignoring.");
374 return -EINVAL;
375 }
376
377 r = dns_name_concat(n, "local", mdns_hostname);
378 if (r < 0)
379 return log_error_errno(r, "Failed to determine mDNS hostname: %m");
380
381 *llmnr_hostname = TAKE_PTR(n);
382 *full_hostname = TAKE_PTR(h);
383
384 return 0;
385}
386
387static const char *fallback_hostname(void) {
388
389 /* Determine the fall back hostname. For exposing this system to the outside world, we cannot have it to be
390 * "localhost" even if that's the compiled in hostname. In this case, let's revert to "linux" instead. */
391
392 if (is_localhost(FALLBACK_HOSTNAME))
393 return "linux";
394
395 return FALLBACK_HOSTNAME;
396}
397
398static int make_fallback_hostnames(char **full_hostname, char **llmnr_hostname, char **mdns_hostname) {
399 _cleanup_free_ char *n = NULL, *m = NULL;
400 char label[DNS_LABEL_MAX], *h;
401 const char *p;
402 int r;
403
404 assert(full_hostname);
405 assert(llmnr_hostname);
406 assert(mdns_hostname);
407
408 p = fallback_hostname();
409 r = dns_label_unescape(&p, label, sizeof(label));
410 if (r < 0)
411 return log_error_errno(r, "Failed to unescape fallback host name: %m");
412
413 assert(r > 0); /* The fallback hostname must have at least one label */
414
415 r = dns_label_escape_new(label, r, &n);
416 if (r < 0)
417 return log_error_errno(r, "Failed to escape fallback hostname: %m");
418
419 r = dns_name_concat(n, "local", &m);
420 if (r < 0)
421 return log_error_errno(r, "Failed to concatenate mDNS hostname: %m");
422
423 h = strdup(fallback_hostname());
424 if (!h)
425 return log_oom();
426
427 *llmnr_hostname = TAKE_PTR(n);
428 *mdns_hostname = TAKE_PTR(m);
429
430 *full_hostname = h;
431
432 return 0;
433}
434
435static int on_hostname_change(sd_event_source *es, int fd, uint32_t revents, void *userdata) {
436 _cleanup_free_ char *full_hostname = NULL, *llmnr_hostname = NULL, *mdns_hostname = NULL;
437 Manager *m = userdata;
438 int r;
439
440 assert(m);
441
442 r = determine_hostname(&full_hostname, &llmnr_hostname, &mdns_hostname);
443 if (r < 0)
444 return 0; /* ignore invalid hostnames */
445
446 if (streq(full_hostname, m->full_hostname) &&
447 streq(llmnr_hostname, m->llmnr_hostname) &&
448 streq(mdns_hostname, m->mdns_hostname))
449 return 0;
450
451 log_info("System hostname changed to '%s'.", full_hostname);
452
453 free_and_replace(m->full_hostname, full_hostname);
454 free_and_replace(m->llmnr_hostname, llmnr_hostname);
455 free_and_replace(m->mdns_hostname, mdns_hostname);
456
457 manager_refresh_rrs(m);
458
459 return 0;
460}
461
462static int manager_watch_hostname(Manager *m) {
463 int r;
464
465 assert(m);
466
467 m->hostname_fd = open("/proc/sys/kernel/hostname",
468 O_RDONLY|O_CLOEXEC|O_NONBLOCK|O_NOCTTY);
469 if (m->hostname_fd < 0) {
470 log_warning_errno(errno, "Failed to watch hostname: %m");
471 return 0;
472 }
473
474 r = sd_event_add_io(m->event, &m->hostname_event_source, m->hostname_fd, 0, on_hostname_change, m);
475 if (r < 0) {
476 if (r == -EPERM)
477 /* kernels prior to 3.2 don't support polling this file. Ignore the failure. */
478 m->hostname_fd = safe_close(m->hostname_fd);
479 else
480 return log_error_errno(r, "Failed to add hostname event source: %m");
481 }
482
483 (void) sd_event_source_set_description(m->hostname_event_source, "hostname");
484
485 r = determine_hostname(&m->full_hostname, &m->llmnr_hostname, &m->mdns_hostname);
486 if (r < 0) {
487 log_info("Defaulting to hostname '%s'.", fallback_hostname());
488
489 r = make_fallback_hostnames(&m->full_hostname, &m->llmnr_hostname, &m->mdns_hostname);
490 if (r < 0)
491 return r;
492 } else
493 log_info("Using system hostname '%s'.", m->full_hostname);
494
495 return 0;
496}
497
498static int manager_sigusr1(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
499 _cleanup_free_ char *buffer = NULL;
500 _cleanup_fclose_ FILE *f = NULL;
501 Manager *m = userdata;
502 DnsServer *server;
503 size_t size = 0;
504 DnsScope *scope;
505 Iterator i;
506 Link *l;
507
508 assert(s);
509 assert(si);
510 assert(m);
511
512 f = open_memstream(&buffer, &size);
513 if (!f)
514 return log_oom();
515
516 (void) __fsetlocking(f, FSETLOCKING_BYCALLER);
517
518 LIST_FOREACH(scopes, scope, m->dns_scopes)
519 dns_scope_dump(scope, f);
520
521 LIST_FOREACH(servers, server, m->dns_servers)
522 dns_server_dump(server, f);
523 LIST_FOREACH(servers, server, m->fallback_dns_servers)
524 dns_server_dump(server, f);
525 HASHMAP_FOREACH(l, m->links, i)
526 LIST_FOREACH(servers, server, l->dns_servers)
527 dns_server_dump(server, f);
528
529 if (fflush_and_check(f) < 0)
530 return log_oom();
531
532 log_dump(LOG_INFO, buffer);
533 return 0;
534}
535
536static int manager_sigusr2(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
537 Manager *m = userdata;
538
539 assert(s);
540 assert(si);
541 assert(m);
542
543 manager_flush_caches(m);
544
545 return 0;
546}
547
548static int manager_sigrtmin1(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
549 Manager *m = userdata;
550
551 assert(s);
552 assert(si);
553 assert(m);
554
555 manager_reset_server_features(m);
556 return 0;
557}
558
559int manager_new(Manager **ret) {
560 _cleanup_(manager_freep) Manager *m = NULL;
561 int r;
562
563 assert(ret);
564
565 m = new(Manager, 1);
566 if (!m)
567 return -ENOMEM;
568
569 *m = (Manager) {
570 .llmnr_ipv4_udp_fd = -1,
571 .llmnr_ipv6_udp_fd = -1,
572 .llmnr_ipv4_tcp_fd = -1,
573 .llmnr_ipv6_tcp_fd = -1,
574 .mdns_ipv4_fd = -1,
575 .mdns_ipv6_fd = -1,
576 .dns_stub_udp_fd = -1,
577 .dns_stub_tcp_fd = -1,
578 .hostname_fd = -1,
579
580 .llmnr_support = RESOLVE_SUPPORT_YES,
581 .mdns_support = RESOLVE_SUPPORT_YES,
582 .dnssec_mode = DEFAULT_DNSSEC_MODE,
583 .dns_over_tls_mode = DEFAULT_DNS_OVER_TLS_MODE,
584 .enable_cache = true,
585 .dns_stub_listener_mode = DNS_STUB_LISTENER_UDP,
586 .read_resolv_conf = true,
587 .need_builtin_fallbacks = true,
588 .etc_hosts_last = USEC_INFINITY,
589 .etc_hosts_mtime = USEC_INFINITY,
590 .read_etc_hosts = true,
591 };
592
593 r = dns_trust_anchor_load(&m->trust_anchor);
594 if (r < 0)
595 return r;
596
597 r = manager_parse_config_file(m);
598 if (r < 0)
599 log_warning_errno(r, "Failed to parse configuration file: %m");
600
601 r = sd_event_default(&m->event);
602 if (r < 0)
603 return r;
604
605 (void) sd_event_add_signal(m->event, NULL, SIGTERM, NULL, NULL);
606 (void) sd_event_add_signal(m->event, NULL, SIGINT, NULL, NULL);
607
608 (void) sd_event_set_watchdog(m->event, true);
609
610 r = manager_watch_hostname(m);
611 if (r < 0)
612 return r;
613
614 r = dnssd_load(m);
615 if (r < 0)
616 log_warning_errno(r, "Failed to load DNS-SD configuration files: %m");
617
618 r = dns_scope_new(m, &m->unicast_scope, NULL, DNS_PROTOCOL_DNS, AF_UNSPEC);
619 if (r < 0)
620 return r;
621
622 r = manager_network_monitor_listen(m);
623 if (r < 0)
624 return r;
625
626 r = manager_rtnl_listen(m);
627 if (r < 0)
628 return r;
629
630 r = manager_connect_bus(m);
631 if (r < 0)
632 return r;
633
634 (void) sd_event_add_signal(m->event, &m->sigusr1_event_source, SIGUSR1, manager_sigusr1, m);
635 (void) sd_event_add_signal(m->event, &m->sigusr2_event_source, SIGUSR2, manager_sigusr2, m);
636 (void) sd_event_add_signal(m->event, &m->sigrtmin1_event_source, SIGRTMIN+1, manager_sigrtmin1, m);
637
638 manager_cleanup_saved_user(m);
639
640 *ret = TAKE_PTR(m);
641
642 return 0;
643}
644
645int manager_start(Manager *m) {
646 int r;
647
648 assert(m);
649
650 r = manager_dns_stub_start(m);
651 if (r < 0)
652 return r;
653
654 return 0;
655}
656
657Manager *manager_free(Manager *m) {
658 Link *l;
659 DnssdService *s;
660
661 if (!m)
662 return NULL;
663
664 dns_server_unlink_all(m->dns_servers);
665 dns_server_unlink_all(m->fallback_dns_servers);
666 dns_search_domain_unlink_all(m->search_domains);
667
668 while ((l = hashmap_first(m->links)))
669 link_free(l);
670
671 while (m->dns_queries)
672 dns_query_free(m->dns_queries);
673
674 dns_scope_free(m->unicast_scope);
675
676 /* At this point only orphaned streams should remain. All others should have been freed already by their
677 * owners */
678 while (m->dns_streams)
679 dns_stream_unref(m->dns_streams);
680
681 hashmap_free(m->links);
682 hashmap_free(m->dns_transactions);
683
684 sd_event_source_unref(m->network_event_source);
685 sd_network_monitor_unref(m->network_monitor);
686
687 sd_netlink_unref(m->rtnl);
688 sd_event_source_unref(m->rtnl_event_source);
689
690 manager_llmnr_stop(m);
691 manager_mdns_stop(m);
692 manager_dns_stub_stop(m);
693
694 sd_bus_unref(m->bus);
695
696 sd_event_source_unref(m->sigusr1_event_source);
697 sd_event_source_unref(m->sigusr2_event_source);
698 sd_event_source_unref(m->sigrtmin1_event_source);
699
700 sd_event_unref(m->event);
701
702 dns_resource_key_unref(m->llmnr_host_ipv4_key);
703 dns_resource_key_unref(m->llmnr_host_ipv6_key);
704 dns_resource_key_unref(m->mdns_host_ipv4_key);
705 dns_resource_key_unref(m->mdns_host_ipv6_key);
706
707 sd_event_source_unref(m->hostname_event_source);
708 safe_close(m->hostname_fd);
709
710 free(m->full_hostname);
711 free(m->llmnr_hostname);
712 free(m->mdns_hostname);
713
714 while ((s = hashmap_first(m->dnssd_services)))
715 dnssd_service_free(s);
716 hashmap_free(m->dnssd_services);
717
718 dns_trust_anchor_flush(&m->trust_anchor);
719 manager_etc_hosts_flush(m);
720
721 return mfree(m);
722}
723
724int manager_recv(Manager *m, int fd, DnsProtocol protocol, DnsPacket **ret) {
725 _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL;
726 union {
727 struct cmsghdr header; /* For alignment */
728 uint8_t buffer[CMSG_SPACE(MAXSIZE(struct in_pktinfo, struct in6_pktinfo))
729 + CMSG_SPACE(int) /* ttl/hoplimit */
730 + EXTRA_CMSG_SPACE /* kernel appears to require extra buffer space */];
731 } control;
732 union sockaddr_union sa;
733 struct iovec iov;
734 struct msghdr mh = {
735 .msg_name = &sa.sa,
736 .msg_namelen = sizeof(sa),
737 .msg_iov = &iov,
738 .msg_iovlen = 1,
739 .msg_control = &control,
740 .msg_controllen = sizeof(control),
741 };
742 struct cmsghdr *cmsg;
743 ssize_t ms, l;
744 int r;
745
746 assert(m);
747 assert(fd >= 0);
748 assert(ret);
749
750 ms = next_datagram_size_fd(fd);
751 if (ms < 0)
752 return ms;
753
754 r = dns_packet_new(&p, protocol, ms, DNS_PACKET_SIZE_MAX);
755 if (r < 0)
756 return r;
757
758 iov = (struct iovec) {
759 .iov_base = DNS_PACKET_DATA(p),
760 iov.iov_len = p->allocated,
761 };
762
763 l = recvmsg(fd, &mh, 0);
764 if (l == 0)
765 return 0;
766 if (l < 0) {
767 if (IN_SET(errno, EAGAIN, EINTR))
768 return 0;
769
770 return -errno;
771 }
772
773 assert(!(mh.msg_flags & MSG_CTRUNC));
774 assert(!(mh.msg_flags & MSG_TRUNC));
775
776 p->size = (size_t) l;
777
778 p->family = sa.sa.sa_family;
779 p->ipproto = IPPROTO_UDP;
780 if (p->family == AF_INET) {
781 p->sender.in = sa.in.sin_addr;
782 p->sender_port = be16toh(sa.in.sin_port);
783 } else if (p->family == AF_INET6) {
784 p->sender.in6 = sa.in6.sin6_addr;
785 p->sender_port = be16toh(sa.in6.sin6_port);
786 p->ifindex = sa.in6.sin6_scope_id;
787 } else
788 return -EAFNOSUPPORT;
789
790 CMSG_FOREACH(cmsg, &mh) {
791
792 if (cmsg->cmsg_level == IPPROTO_IPV6) {
793 assert(p->family == AF_INET6);
794
795 switch (cmsg->cmsg_type) {
796
797 case IPV6_PKTINFO: {
798 struct in6_pktinfo *i = (struct in6_pktinfo*) CMSG_DATA(cmsg);
799
800 if (p->ifindex <= 0)
801 p->ifindex = i->ipi6_ifindex;
802
803 p->destination.in6 = i->ipi6_addr;
804 break;
805 }
806
807 case IPV6_HOPLIMIT:
808 p->ttl = *(int *) CMSG_DATA(cmsg);
809 break;
810
811 }
812 } else if (cmsg->cmsg_level == IPPROTO_IP) {
813 assert(p->family == AF_INET);
814
815 switch (cmsg->cmsg_type) {
816
817 case IP_PKTINFO: {
818 struct in_pktinfo *i = (struct in_pktinfo*) CMSG_DATA(cmsg);
819
820 if (p->ifindex <= 0)
821 p->ifindex = i->ipi_ifindex;
822
823 p->destination.in = i->ipi_addr;
824 break;
825 }
826
827 case IP_TTL:
828 p->ttl = *(int *) CMSG_DATA(cmsg);
829 break;
830 }
831 }
832 }
833
834 /* The Linux kernel sets the interface index to the loopback
835 * device if the packet came from the local host since it
836 * avoids the routing table in such a case. Let's unset the
837 * interface index in such a case. */
838 if (p->ifindex == LOOPBACK_IFINDEX)
839 p->ifindex = 0;
840
841 if (protocol != DNS_PROTOCOL_DNS) {
842 /* If we don't know the interface index still, we look for the
843 * first local interface with a matching address. Yuck! */
844 if (p->ifindex <= 0)
845 p->ifindex = manager_find_ifindex(m, p->family, &p->destination);
846 }
847
848 *ret = TAKE_PTR(p);
849
850 return 1;
851}
852
853static int sendmsg_loop(int fd, struct msghdr *mh, int flags) {
854 int r;
855
856 assert(fd >= 0);
857 assert(mh);
858
859 for (;;) {
860 if (sendmsg(fd, mh, flags) >= 0)
861 return 0;
862
863 if (errno == EINTR)
864 continue;
865
866 if (errno != EAGAIN)
867 return -errno;
868
869 r = fd_wait_for_event(fd, POLLOUT, SEND_TIMEOUT_USEC);
870 if (r < 0)
871 return r;
872 if (r == 0)
873 return -ETIMEDOUT;
874 }
875}
876
877static int write_loop(int fd, void *message, size_t length) {
878 int r;
879
880 assert(fd >= 0);
881 assert(message);
882
883 for (;;) {
884 if (write(fd, message, length) >= 0)
885 return 0;
886
887 if (errno == EINTR)
888 continue;
889
890 if (errno != EAGAIN)
891 return -errno;
892
893 r = fd_wait_for_event(fd, POLLOUT, SEND_TIMEOUT_USEC);
894 if (r < 0)
895 return r;
896 if (r == 0)
897 return -ETIMEDOUT;
898 }
899}
900
901int manager_write(Manager *m, int fd, DnsPacket *p) {
902 int r;
903
904 log_debug("Sending %s packet with id %" PRIu16 ".", DNS_PACKET_QR(p) ? "response" : "query", DNS_PACKET_ID(p));
905
906 r = write_loop(fd, DNS_PACKET_DATA(p), p->size);
907 if (r < 0)
908 return r;
909
910 return 0;
911}
912
913static int manager_ipv4_send(
914 Manager *m,
915 int fd,
916 int ifindex,
917 const struct in_addr *destination,
918 uint16_t port,
919 const struct in_addr *source,
920 DnsPacket *p) {
921 union {
922 struct cmsghdr header; /* For alignment */
923 uint8_t buffer[CMSG_SPACE(sizeof(struct in_pktinfo))];
924 } control = {};
925 union sockaddr_union sa;
926 struct iovec iov;
927 struct msghdr mh = {
928 .msg_iov = &iov,
929 .msg_iovlen = 1,
930 .msg_name = &sa.sa,
931 .msg_namelen = sizeof(sa.in),
932 };
933
934 assert(m);
935 assert(fd >= 0);
936 assert(destination);
937 assert(port > 0);
938 assert(p);
939
940 iov = (struct iovec) {
941 .iov_base = DNS_PACKET_DATA(p),
942 .iov_len = p->size,
943 };
944
945 sa = (union sockaddr_union) {
946 .in.sin_family = AF_INET,
947 .in.sin_addr = *destination,
948 .in.sin_port = htobe16(port),
949 };
950
951 if (ifindex > 0) {
952 struct cmsghdr *cmsg;
953 struct in_pktinfo *pi;
954
955 mh.msg_control = &control;
956 mh.msg_controllen = CMSG_LEN(sizeof(struct in_pktinfo));
957
958 cmsg = CMSG_FIRSTHDR(&mh);
959 cmsg->cmsg_len = mh.msg_controllen;
960 cmsg->cmsg_level = IPPROTO_IP;
961 cmsg->cmsg_type = IP_PKTINFO;
962
963 pi = (struct in_pktinfo*) CMSG_DATA(cmsg);
964 pi->ipi_ifindex = ifindex;
965
966 if (source)
967 pi->ipi_spec_dst = *source;
968 }
969
970 return sendmsg_loop(fd, &mh, 0);
971}
972
973static int manager_ipv6_send(
974 Manager *m,
975 int fd,
976 int ifindex,
977 const struct in6_addr *destination,
978 uint16_t port,
979 const struct in6_addr *source,
980 DnsPacket *p) {
981
982 union {
983 struct cmsghdr header; /* For alignment */
984 uint8_t buffer[CMSG_SPACE(sizeof(struct in6_pktinfo))];
985 } control = {};
986 union sockaddr_union sa;
987 struct iovec iov;
988 struct msghdr mh = {
989 .msg_iov = &iov,
990 .msg_iovlen = 1,
991 .msg_name = &sa.sa,
992 .msg_namelen = sizeof(sa.in6),
993 };
994
995 assert(m);
996 assert(fd >= 0);
997 assert(destination);
998 assert(port > 0);
999 assert(p);
1000
1001 iov = (struct iovec) {
1002 .iov_base = DNS_PACKET_DATA(p),
1003 .iov_len = p->size,
1004 };
1005
1006 sa = (union sockaddr_union) {
1007 .in6.sin6_family = AF_INET6,
1008 .in6.sin6_addr = *destination,
1009 .in6.sin6_port = htobe16(port),
1010 .in6.sin6_scope_id = ifindex,
1011 };
1012
1013 if (ifindex > 0) {
1014 struct cmsghdr *cmsg;
1015 struct in6_pktinfo *pi;
1016
1017 mh.msg_control = &control;
1018 mh.msg_controllen = CMSG_LEN(sizeof(struct in6_pktinfo));
1019
1020 cmsg = CMSG_FIRSTHDR(&mh);
1021 cmsg->cmsg_len = mh.msg_controllen;
1022 cmsg->cmsg_level = IPPROTO_IPV6;
1023 cmsg->cmsg_type = IPV6_PKTINFO;
1024
1025 pi = (struct in6_pktinfo*) CMSG_DATA(cmsg);
1026 pi->ipi6_ifindex = ifindex;
1027
1028 if (source)
1029 pi->ipi6_addr = *source;
1030 }
1031
1032 return sendmsg_loop(fd, &mh, 0);
1033}
1034
1035int manager_send(
1036 Manager *m,
1037 int fd,
1038 int ifindex,
1039 int family,
1040 const union in_addr_union *destination,
1041 uint16_t port,
1042 const union in_addr_union *source,
1043 DnsPacket *p) {
1044
1045 assert(m);
1046 assert(fd >= 0);
1047 assert(destination);
1048 assert(port > 0);
1049 assert(p);
1050
1051 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));
1052
1053 if (family == AF_INET)
1054 return manager_ipv4_send(m, fd, ifindex, &destination->in, port, source ? &source->in : NULL, p);
1055 if (family == AF_INET6)
1056 return manager_ipv6_send(m, fd, ifindex, &destination->in6, port, source ? &source->in6 : NULL, p);
1057
1058 return -EAFNOSUPPORT;
1059}
1060
1061uint32_t manager_find_mtu(Manager *m) {
1062 uint32_t mtu = 0;
1063 Link *l;
1064 Iterator i;
1065
1066 /* If we don't know on which link a DNS packet would be
1067 * delivered, let's find the largest MTU that works on all
1068 * interfaces we know of */
1069
1070 HASHMAP_FOREACH(l, m->links, i) {
1071 if (l->mtu <= 0)
1072 continue;
1073
1074 if (mtu <= 0 || l->mtu < mtu)
1075 mtu = l->mtu;
1076 }
1077
1078 return mtu;
1079}
1080
1081int manager_find_ifindex(Manager *m, int family, const union in_addr_union *in_addr) {
1082 LinkAddress *a;
1083
1084 assert(m);
1085
1086 a = manager_find_link_address(m, family, in_addr);
1087 if (a)
1088 return a->link->ifindex;
1089
1090 return 0;
1091}
1092
1093void manager_refresh_rrs(Manager *m) {
1094 Iterator i;
1095 Link *l;
1096 DnssdService *s;
1097
1098 assert(m);
1099
1100 m->llmnr_host_ipv4_key = dns_resource_key_unref(m->llmnr_host_ipv4_key);
1101 m->llmnr_host_ipv6_key = dns_resource_key_unref(m->llmnr_host_ipv6_key);
1102 m->mdns_host_ipv4_key = dns_resource_key_unref(m->mdns_host_ipv4_key);
1103 m->mdns_host_ipv6_key = dns_resource_key_unref(m->mdns_host_ipv6_key);
1104
1105 if (m->mdns_support == RESOLVE_SUPPORT_YES)
1106 HASHMAP_FOREACH(s, m->dnssd_services, i)
1107 if (dnssd_update_rrs(s) < 0)
1108 log_warning("Failed to refresh DNS-SD service '%s'", s->name);
1109
1110 HASHMAP_FOREACH(l, m->links, i) {
1111 link_add_rrs(l, true);
1112 link_add_rrs(l, false);
1113 }
1114}
1115
1116static int manager_next_random_name(const char *old, char **ret_new) {
1117 const char *p;
1118 uint64_t u, a;
1119 char *n;
1120
1121 p = strchr(old, 0);
1122 assert(p);
1123
1124 while (p > old) {
1125 if (!strchr(DIGITS, p[-1]))
1126 break;
1127
1128 p--;
1129 }
1130
1131 if (*p == 0 || safe_atou64(p, &u) < 0 || u <= 0)
1132 u = 1;
1133
1134 /* Add a random number to the old value. This way we can avoid
1135 * that two hosts pick the same hostname, win on IPv4 and lose
1136 * on IPv6 (or vice versa), and pick the same hostname
1137 * replacement hostname, ad infinitum. We still want the
1138 * numbers to go up monotonically, hence we just add a random
1139 * value 1..10 */
1140
1141 random_bytes(&a, sizeof(a));
1142 u += 1 + a % 10;
1143
1144 if (asprintf(&n, "%.*s%" PRIu64, (int) (p - old), old, u) < 0)
1145 return -ENOMEM;
1146
1147 *ret_new = n;
1148
1149 return 0;
1150}
1151
1152int manager_next_hostname(Manager *m) {
1153 _cleanup_free_ char *h = NULL, *k = NULL;
1154 int r;
1155
1156 assert(m);
1157
1158 r = manager_next_random_name(m->llmnr_hostname, &h);
1159 if (r < 0)
1160 return r;
1161
1162 r = dns_name_concat(h, "local", &k);
1163 if (r < 0)
1164 return r;
1165
1166 log_info("Hostname conflict, changing published hostname from '%s' to '%s'.", m->llmnr_hostname, h);
1167
1168 free_and_replace(m->llmnr_hostname, h);
1169 free_and_replace(m->mdns_hostname, k);
1170
1171 manager_refresh_rrs(m);
1172
1173 return 0;
1174}
1175
1176LinkAddress* manager_find_link_address(Manager *m, int family, const union in_addr_union *in_addr) {
1177 Iterator i;
1178 Link *l;
1179
1180 assert(m);
1181
1182 HASHMAP_FOREACH(l, m->links, i) {
1183 LinkAddress *a;
1184
1185 a = link_find_address(l, family, in_addr);
1186 if (a)
1187 return a;
1188 }
1189
1190 return NULL;
1191}
1192
1193bool manager_our_packet(Manager *m, DnsPacket *p) {
1194 assert(m);
1195 assert(p);
1196
1197 return !!manager_find_link_address(m, p->family, &p->sender);
1198}
1199
1200DnsScope* manager_find_scope(Manager *m, DnsPacket *p) {
1201 Link *l;
1202
1203 assert(m);
1204 assert(p);
1205
1206 l = hashmap_get(m->links, INT_TO_PTR(p->ifindex));
1207 if (!l)
1208 return NULL;
1209
1210 switch (p->protocol) {
1211 case DNS_PROTOCOL_LLMNR:
1212 if (p->family == AF_INET)
1213 return l->llmnr_ipv4_scope;
1214 else if (p->family == AF_INET6)
1215 return l->llmnr_ipv6_scope;
1216
1217 break;
1218
1219 case DNS_PROTOCOL_MDNS:
1220 if (p->family == AF_INET)
1221 return l->mdns_ipv4_scope;
1222 else if (p->family == AF_INET6)
1223 return l->mdns_ipv6_scope;
1224
1225 break;
1226
1227 default:
1228 break;
1229 }
1230
1231 return NULL;
1232}
1233
1234void manager_verify_all(Manager *m) {
1235 DnsScope *s;
1236
1237 assert(m);
1238
1239 LIST_FOREACH(scopes, s, m->dns_scopes)
1240 dns_zone_verify_all(&s->zone);
1241}
1242
1243int manager_is_own_hostname(Manager *m, const char *name) {
1244 int r;
1245
1246 assert(m);
1247 assert(name);
1248
1249 if (m->llmnr_hostname) {
1250 r = dns_name_equal(name, m->llmnr_hostname);
1251 if (r != 0)
1252 return r;
1253 }
1254
1255 if (m->mdns_hostname) {
1256 r = dns_name_equal(name, m->mdns_hostname);
1257 if (r != 0)
1258 return r;
1259 }
1260
1261 if (m->full_hostname)
1262 return dns_name_equal(name, m->full_hostname);
1263
1264 return 0;
1265}
1266
1267int manager_compile_dns_servers(Manager *m, OrderedSet **dns) {
1268 DnsServer *s;
1269 Iterator i;
1270 Link *l;
1271 int r;
1272
1273 assert(m);
1274 assert(dns);
1275
1276 r = ordered_set_ensure_allocated(dns, &dns_server_hash_ops);
1277 if (r < 0)
1278 return r;
1279
1280 /* First add the system-wide servers and domains */
1281 LIST_FOREACH(servers, s, m->dns_servers) {
1282 r = ordered_set_put(*dns, s);
1283 if (r == -EEXIST)
1284 continue;
1285 if (r < 0)
1286 return r;
1287 }
1288
1289 /* Then, add the per-link servers */
1290 HASHMAP_FOREACH(l, m->links, i) {
1291 LIST_FOREACH(servers, s, l->dns_servers) {
1292 r = ordered_set_put(*dns, s);
1293 if (r == -EEXIST)
1294 continue;
1295 if (r < 0)
1296 return r;
1297 }
1298 }
1299
1300 /* If we found nothing, add the fallback servers */
1301 if (ordered_set_isempty(*dns)) {
1302 LIST_FOREACH(servers, s, m->fallback_dns_servers) {
1303 r = ordered_set_put(*dns, s);
1304 if (r == -EEXIST)
1305 continue;
1306 if (r < 0)
1307 return r;
1308 }
1309 }
1310
1311 return 0;
1312}
1313
1314/* filter_route is a tri-state:
1315 * < 0: no filtering
1316 * = 0 or false: return only domains which should be used for searching
1317 * > 0 or true: return only domains which are for routing only
1318 */
1319int manager_compile_search_domains(Manager *m, OrderedSet **domains, int filter_route) {
1320 DnsSearchDomain *d;
1321 Iterator i;
1322 Link *l;
1323 int r;
1324
1325 assert(m);
1326 assert(domains);
1327
1328 r = ordered_set_ensure_allocated(domains, &dns_name_hash_ops);
1329 if (r < 0)
1330 return r;
1331
1332 LIST_FOREACH(domains, d, m->search_domains) {
1333
1334 if (filter_route >= 0 &&
1335 d->route_only != !!filter_route)
1336 continue;
1337
1338 r = ordered_set_put(*domains, d->name);
1339 if (r == -EEXIST)
1340 continue;
1341 if (r < 0)
1342 return r;
1343 }
1344
1345 HASHMAP_FOREACH(l, m->links, i) {
1346
1347 LIST_FOREACH(domains, d, l->search_domains) {
1348
1349 if (filter_route >= 0 &&
1350 d->route_only != !!filter_route)
1351 continue;
1352
1353 r = ordered_set_put(*domains, d->name);
1354 if (r == -EEXIST)
1355 continue;
1356 if (r < 0)
1357 return r;
1358 }
1359 }
1360
1361 return 0;
1362}
1363
1364DnssecMode manager_get_dnssec_mode(Manager *m) {
1365 assert(m);
1366
1367 if (m->dnssec_mode != _DNSSEC_MODE_INVALID)
1368 return m->dnssec_mode;
1369
1370 return DNSSEC_NO;
1371}
1372
1373bool manager_dnssec_supported(Manager *m) {
1374 DnsServer *server;
1375 Iterator i;
1376 Link *l;
1377
1378 assert(m);
1379
1380 if (manager_get_dnssec_mode(m) == DNSSEC_NO)
1381 return false;
1382
1383 server = manager_get_dns_server(m);
1384 if (server && !dns_server_dnssec_supported(server))
1385 return false;
1386
1387 HASHMAP_FOREACH(l, m->links, i)
1388 if (!link_dnssec_supported(l))
1389 return false;
1390
1391 return true;
1392}
1393
1394DnsOverTlsMode manager_get_dns_over_tls_mode(Manager *m) {
1395 assert(m);
1396
1397 if (m->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
1398 return m->dns_over_tls_mode;
1399
1400 return DNS_OVER_TLS_NO;
1401}
1402
1403void manager_dnssec_verdict(Manager *m, DnssecVerdict verdict, const DnsResourceKey *key) {
1404
1405 assert(verdict >= 0);
1406 assert(verdict < _DNSSEC_VERDICT_MAX);
1407
1408 if (DEBUG_LOGGING) {
1409 char s[DNS_RESOURCE_KEY_STRING_MAX];
1410
1411 log_debug("Found verdict for lookup %s: %s",
1412 dns_resource_key_to_string(key, s, sizeof s),
1413 dnssec_verdict_to_string(verdict));
1414 }
1415
1416 m->n_dnssec_verdict[verdict]++;
1417}
1418
1419bool manager_routable(Manager *m, int family) {
1420 Iterator i;
1421 Link *l;
1422
1423 assert(m);
1424
1425 /* Returns true if the host has at least one interface with a routable address of the specified type */
1426
1427 HASHMAP_FOREACH(l, m->links, i)
1428 if (link_relevant(l, family, false))
1429 return true;
1430
1431 return false;
1432}
1433
1434void manager_flush_caches(Manager *m) {
1435 DnsScope *scope;
1436
1437 assert(m);
1438
1439 LIST_FOREACH(scopes, scope, m->dns_scopes)
1440 dns_cache_flush(&scope->cache);
1441
1442 log_info("Flushed all caches.");
1443}
1444
1445void manager_reset_server_features(Manager *m) {
1446 Iterator i;
1447 Link *l;
1448
1449 dns_server_reset_features_all(m->dns_servers);
1450 dns_server_reset_features_all(m->fallback_dns_servers);
1451
1452 HASHMAP_FOREACH(l, m->links, i)
1453 dns_server_reset_features_all(l->dns_servers);
1454
1455 log_info("Resetting learnt feature levels on all servers.");
1456}
1457
1458void manager_cleanup_saved_user(Manager *m) {
1459 _cleanup_closedir_ DIR *d = NULL;
1460 struct dirent *de;
1461 int r;
1462
1463 assert(m);
1464
1465 /* Clean up all saved per-link files in /run/systemd/resolve/netif/ that don't have a matching interface
1466 * anymore. These files are created to persist settings pushed in by the user via the bus, so that resolved can
1467 * be restarted without losing this data. */
1468
1469 d = opendir("/run/systemd/resolve/netif/");
1470 if (!d) {
1471 if (errno == ENOENT)
1472 return;
1473
1474 log_warning_errno(errno, "Failed to open interface directory: %m");
1475 return;
1476 }
1477
1478 FOREACH_DIRENT_ALL(de, d, log_error_errno(errno, "Failed to read interface directory: %m")) {
1479 _cleanup_free_ char *p = NULL;
1480 int ifindex;
1481 Link *l;
1482
1483 if (!IN_SET(de->d_type, DT_UNKNOWN, DT_REG))
1484 continue;
1485
1486 if (dot_or_dot_dot(de->d_name))
1487 continue;
1488
1489 r = parse_ifindex(de->d_name, &ifindex);
1490 if (r < 0) /* Probably some temporary file from a previous run. Delete it */
1491 goto rm;
1492
1493 l = hashmap_get(m->links, INT_TO_PTR(ifindex));
1494 if (!l) /* link vanished */
1495 goto rm;
1496
1497 if (l->is_managed) /* now managed by networkd, hence the bus settings are useless */
1498 goto rm;
1499
1500 continue;
1501
1502 rm:
1503 p = strappend("/run/systemd/resolve/netif/", de->d_name);
1504 if (!p) {
1505 log_oom();
1506 return;
1507 }
1508
1509 (void) unlink(p);
1510 }
1511}
1512
1513bool manager_next_dnssd_names(Manager *m) {
1514 Iterator i;
1515 DnssdService *s;
1516 bool tried = false;
1517 int r;
1518
1519 assert(m);
1520
1521 HASHMAP_FOREACH(s, m->dnssd_services, i) {
1522 _cleanup_free_ char * new_name = NULL;
1523
1524 if (!s->withdrawn)
1525 continue;
1526
1527 r = manager_next_random_name(s->name_template, &new_name);
1528 if (r < 0) {
1529 log_warning_errno(r, "Failed to get new name for service '%s': %m", s->name);
1530 continue;
1531 }
1532
1533 free_and_replace(s->name_template, new_name);
1534
1535 s->withdrawn = false;
1536
1537 tried = true;
1538 }
1539
1540 if (tried)
1541 manager_refresh_rrs(m);
1542
1543 return tried;
1544}
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