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Merge pull request #9263 from poettering/log-serialize
[thirdparty/systemd.git] / src / resolve / resolved-manager.c
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1/* SPDX-License-Identifier: LGPL-2.1+ */
2/***
3 This file is part of systemd.
4
5 Copyright 2014 Tom Gundersen <teg@jklm.no>
6 ***/
7
8#include <netinet/in.h>
9#include <poll.h>
10#include <stdio_ext.h>
11#include <sys/ioctl.h>
12
13#if HAVE_LIBIDN2
14#include <idn2.h>
15#endif
16
17#include "af-list.h"
18#include "alloc-util.h"
19#include "dirent-util.h"
20#include "dns-domain.h"
21#include "fd-util.h"
22#include "fileio-label.h"
23#include "hostname-util.h"
24#include "io-util.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-dnssd.h"
33#include "resolved-dns-stub.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 "socket-util.h"
40#include "string-table.h"
41#include "string-util.h"
42#include "utf8.h"
43
44#define SEND_TIMEOUT_USEC (200 * USEC_PER_MSEC)
45
46static int manager_process_link(sd_netlink *rtnl, sd_netlink_message *mm, void *userdata) {
47 Manager *m = userdata;
48 uint16_t type;
49 Link *l;
50 int ifindex, r;
51
52 assert(rtnl);
53 assert(m);
54 assert(mm);
55
56 r = sd_netlink_message_get_type(mm, &type);
57 if (r < 0)
58 goto fail;
59
60 r = sd_rtnl_message_link_get_ifindex(mm, &ifindex);
61 if (r < 0)
62 goto fail;
63
64 l = hashmap_get(m->links, INT_TO_PTR(ifindex));
65
66 switch (type) {
67
68 case RTM_NEWLINK:{
69 bool is_new = !l;
70
71 if (!l) {
72 r = link_new(m, &l, ifindex);
73 if (r < 0)
74 goto fail;
75 }
76
77 r = link_process_rtnl(l, mm);
78 if (r < 0)
79 goto fail;
80
81 r = link_update(l);
82 if (r < 0)
83 goto fail;
84
85 if (is_new)
86 log_debug("Found new link %i/%s", ifindex, l->name);
87
88 break;
89 }
90
91 case RTM_DELLINK:
92 if (l) {
93 log_debug("Removing link %i/%s", l->ifindex, l->name);
94 link_remove_user(l);
95 link_free(l);
96 }
97
98 break;
99 }
100
101 return 0;
102
103fail:
104 log_warning_errno(r, "Failed to process RTNL link message: %m");
105 return 0;
106}
107
108static int manager_process_address(sd_netlink *rtnl, sd_netlink_message *mm, void *userdata) {
109 Manager *m = userdata;
110 union in_addr_union address;
111 uint16_t type;
112 int r, ifindex, family;
113 LinkAddress *a;
114 Link *l;
115
116 assert(rtnl);
117 assert(mm);
118 assert(m);
119
120 r = sd_netlink_message_get_type(mm, &type);
121 if (r < 0)
122 goto fail;
123
124 r = sd_rtnl_message_addr_get_ifindex(mm, &ifindex);
125 if (r < 0)
126 goto fail;
127
128 l = hashmap_get(m->links, INT_TO_PTR(ifindex));
129 if (!l)
130 return 0;
131
132 r = sd_rtnl_message_addr_get_family(mm, &family);
133 if (r < 0)
134 goto fail;
135
136 switch (family) {
137
138 case AF_INET:
139 r = sd_netlink_message_read_in_addr(mm, IFA_LOCAL, &address.in);
140 if (r < 0) {
141 r = sd_netlink_message_read_in_addr(mm, IFA_ADDRESS, &address.in);
142 if (r < 0)
143 goto fail;
144 }
145
146 break;
147
148 case AF_INET6:
149 r = sd_netlink_message_read_in6_addr(mm, IFA_LOCAL, &address.in6);
150 if (r < 0) {
151 r = sd_netlink_message_read_in6_addr(mm, IFA_ADDRESS, &address.in6);
152 if (r < 0)
153 goto fail;
154 }
155
156 break;
157
158 default:
159 return 0;
160 }
161
162 a = link_find_address(l, family, &address);
163
164 switch (type) {
165
166 case RTM_NEWADDR:
167
168 if (!a) {
169 r = link_address_new(l, &a, family, &address);
170 if (r < 0)
171 return r;
172 }
173
174 r = link_address_update_rtnl(a, mm);
175 if (r < 0)
176 return r;
177
178 break;
179
180 case RTM_DELADDR:
181 link_address_free(a);
182 break;
183 }
184
185 return 0;
186
187fail:
188 log_warning_errno(r, "Failed to process RTNL address message: %m");
189 return 0;
190}
191
192static int manager_rtnl_listen(Manager *m) {
193 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL;
194 sd_netlink_message *i;
195 int r;
196
197 assert(m);
198
199 /* First, subscribe to interfaces coming and going */
200 r = sd_netlink_open(&m->rtnl);
201 if (r < 0)
202 return r;
203
204 r = sd_netlink_attach_event(m->rtnl, m->event, SD_EVENT_PRIORITY_IMPORTANT);
205 if (r < 0)
206 return r;
207
208 r = sd_netlink_add_match(m->rtnl, RTM_NEWLINK, manager_process_link, m);
209 if (r < 0)
210 return r;
211
212 r = sd_netlink_add_match(m->rtnl, RTM_DELLINK, manager_process_link, m);
213 if (r < 0)
214 return r;
215
216 r = sd_netlink_add_match(m->rtnl, RTM_NEWADDR, manager_process_address, m);
217 if (r < 0)
218 return r;
219
220 r = sd_netlink_add_match(m->rtnl, RTM_DELADDR, manager_process_address, m);
221 if (r < 0)
222 return r;
223
224 /* Then, enumerate all links */
225 r = sd_rtnl_message_new_link(m->rtnl, &req, RTM_GETLINK, 0);
226 if (r < 0)
227 return r;
228
229 r = sd_netlink_message_request_dump(req, true);
230 if (r < 0)
231 return r;
232
233 r = sd_netlink_call(m->rtnl, req, 0, &reply);
234 if (r < 0)
235 return r;
236
237 for (i = reply; i; i = sd_netlink_message_next(i)) {
238 r = manager_process_link(m->rtnl, i, m);
239 if (r < 0)
240 return r;
241 }
242
243 req = sd_netlink_message_unref(req);
244 reply = sd_netlink_message_unref(reply);
245
246 /* Finally, enumerate all addresses, too */
247 r = sd_rtnl_message_new_addr(m->rtnl, &req, RTM_GETADDR, 0, AF_UNSPEC);
248 if (r < 0)
249 return r;
250
251 r = sd_netlink_message_request_dump(req, true);
252 if (r < 0)
253 return r;
254
255 r = sd_netlink_call(m->rtnl, req, 0, &reply);
256 if (r < 0)
257 return r;
258
259 for (i = reply; i; i = sd_netlink_message_next(i)) {
260 r = manager_process_address(m->rtnl, i, m);
261 if (r < 0)
262 return r;
263 }
264
265 return r;
266}
267
268static int on_network_event(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
269 Manager *m = userdata;
270 Iterator i;
271 Link *l;
272 int r;
273
274 assert(m);
275
276 sd_network_monitor_flush(m->network_monitor);
277
278 HASHMAP_FOREACH(l, m->links, i) {
279 r = link_update(l);
280 if (r < 0)
281 log_warning_errno(r, "Failed to update monitor information for %i: %m", l->ifindex);
282 }
283
284 (void) manager_write_resolv_conf(m);
285
286 return 0;
287}
288
289static int manager_network_monitor_listen(Manager *m) {
290 int r, fd, events;
291
292 assert(m);
293
294 r = sd_network_monitor_new(&m->network_monitor, NULL);
295 if (r < 0)
296 return r;
297
298 fd = sd_network_monitor_get_fd(m->network_monitor);
299 if (fd < 0)
300 return fd;
301
302 events = sd_network_monitor_get_events(m->network_monitor);
303 if (events < 0)
304 return events;
305
306 r = sd_event_add_io(m->event, &m->network_event_source, fd, events, &on_network_event, m);
307 if (r < 0)
308 return r;
309
310 r = sd_event_source_set_priority(m->network_event_source, SD_EVENT_PRIORITY_IMPORTANT+5);
311 if (r < 0)
312 return r;
313
314 (void) sd_event_source_set_description(m->network_event_source, "network-monitor");
315
316 return 0;
317}
318
319static int determine_hostname(char **full_hostname, char **llmnr_hostname, char **mdns_hostname) {
320 _cleanup_free_ char *h = NULL, *n = NULL;
321#if HAVE_LIBIDN2
322 _cleanup_free_ char *utf8 = NULL;
323#elif HAVE_LIBIDN
324 int k;
325#endif
326 char label[DNS_LABEL_MAX];
327 const char *p, *decoded;
328 int r;
329
330 assert(full_hostname);
331 assert(llmnr_hostname);
332 assert(mdns_hostname);
333
334 /* Extract and normalize the first label of the locally configured hostname, and check it's not "localhost". */
335
336 r = gethostname_strict(&h);
337 if (r < 0)
338 return log_debug_errno(r, "Can't determine system hostname: %m");
339
340 p = h;
341 r = dns_label_unescape(&p, label, sizeof label);
342 if (r < 0)
343 return log_error_errno(r, "Failed to unescape host name: %m");
344 if (r == 0) {
345 log_error("Couldn't find a single label in hostname.");
346 return -EINVAL;
347 }
348
349#if HAVE_LIBIDN2
350 r = idn2_to_unicode_8z8z(label, &utf8, 0);
351 if (r != IDN2_OK)
352 return log_error("Failed to undo IDNA: %s", idn2_strerror(r));
353 assert(utf8_is_valid(utf8));
354
355 r = strlen(utf8);
356 decoded = utf8;
357#elif HAVE_LIBIDN
358 k = dns_label_undo_idna(label, r, label, sizeof label);
359 if (k < 0)
360 return log_error_errno(k, "Failed to undo IDNA: %m");
361 if (k > 0)
362 r = k;
363
364 if (!utf8_is_valid(label)) {
365 log_error("System hostname is not UTF-8 clean.");
366 return -EINVAL;
367 }
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 host name: %m");
376
377 if (is_localhost(n)) {
378 log_debug("System hostname is 'localhost', ignoring.");
379 return -EINVAL;
380 }
381
382 r = dns_name_concat(n, "local", mdns_hostname);
383 if (r < 0)
384 return log_error_errno(r, "Failed to determine mDNS hostname: %m");
385
386 *llmnr_hostname = TAKE_PTR(n);
387 *full_hostname = TAKE_PTR(h);
388
389 return 0;
390}
391
392static const char *fallback_hostname(void) {
393
394 /* Determine the fall back hostname. For exposing this system to the outside world, we cannot have it to be
395 * "localhost" even if that's the compiled in hostname. In this case, let's revert to "linux" instead. */
396
397 if (is_localhost(FALLBACK_HOSTNAME))
398 return "linux";
399
400 return FALLBACK_HOSTNAME;
401}
402
403static int make_fallback_hostnames(char **full_hostname, char **llmnr_hostname, char **mdns_hostname) {
404 _cleanup_free_ char *n = NULL, *m = NULL;
405 char label[DNS_LABEL_MAX], *h;
406 const char *p;
407 int r;
408
409 assert(full_hostname);
410 assert(llmnr_hostname);
411 assert(mdns_hostname);
412
413 p = fallback_hostname();
414 r = dns_label_unescape(&p, label, sizeof(label));
415 if (r < 0)
416 return log_error_errno(r, "Failed to unescape fallback host name: %m");
417
418 assert(r > 0); /* The fallback hostname must have at least one label */
419
420 r = dns_label_escape_new(label, r, &n);
421 if (r < 0)
422 return log_error_errno(r, "Failed to escape fallback hostname: %m");
423
424 r = dns_name_concat(n, "local", &m);
425 if (r < 0)
426 return log_error_errno(r, "Failed to concatenate mDNS hostname: %m");
427
428 h = strdup(fallback_hostname());
429 if (!h)
430 return log_oom();
431
432 *llmnr_hostname = TAKE_PTR(n);
433 *mdns_hostname = TAKE_PTR(m);
434
435 *full_hostname = h;
436
437 return 0;
438}
439
440static int on_hostname_change(sd_event_source *es, int fd, uint32_t revents, void *userdata) {
441 _cleanup_free_ char *full_hostname = NULL, *llmnr_hostname = NULL, *mdns_hostname = NULL;
442 Manager *m = userdata;
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 if (streq(full_hostname, m->full_hostname) &&
452 streq(llmnr_hostname, m->llmnr_hostname) &&
453 streq(mdns_hostname, m->mdns_hostname))
454 return 0;
455
456 log_info("System hostname changed to '%s'.", full_hostname);
457
458 free_and_replace(m->full_hostname, full_hostname);
459 free_and_replace(m->llmnr_hostname, llmnr_hostname);
460 free_and_replace(m->mdns_hostname, mdns_hostname);
461
462 manager_refresh_rrs(m);
463
464 return 0;
465}
466
467static int manager_watch_hostname(Manager *m) {
468 int r;
469
470 assert(m);
471
472 m->hostname_fd = open("/proc/sys/kernel/hostname",
473 O_RDONLY|O_CLOEXEC|O_NONBLOCK|O_NOCTTY);
474 if (m->hostname_fd < 0) {
475 log_warning_errno(errno, "Failed to watch hostname: %m");
476 return 0;
477 }
478
479 r = sd_event_add_io(m->event, &m->hostname_event_source, m->hostname_fd, 0, on_hostname_change, m);
480 if (r < 0) {
481 if (r == -EPERM)
482 /* kernels prior to 3.2 don't support polling this file. Ignore the failure. */
483 m->hostname_fd = safe_close(m->hostname_fd);
484 else
485 return log_error_errno(r, "Failed to add hostname event source: %m");
486 }
487
488 (void) sd_event_source_set_description(m->hostname_event_source, "hostname");
489
490 r = determine_hostname(&m->full_hostname, &m->llmnr_hostname, &m->mdns_hostname);
491 if (r < 0) {
492 log_info("Defaulting to hostname '%s'.", fallback_hostname());
493
494 r = make_fallback_hostnames(&m->full_hostname, &m->llmnr_hostname, &m->mdns_hostname);
495 if (r < 0)
496 return r;
497 } else
498 log_info("Using system hostname '%s'.", m->full_hostname);
499
500 return 0;
501}
502
503static int manager_sigusr1(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
504 _cleanup_free_ char *buffer = NULL;
505 _cleanup_fclose_ FILE *f = NULL;
506 Manager *m = userdata;
507 DnsServer *server;
508 size_t size = 0;
509 DnsScope *scope;
510 Iterator i;
511 Link *l;
512
513 assert(s);
514 assert(si);
515 assert(m);
516
517 f = open_memstream(&buffer, &size);
518 if (!f)
519 return log_oom();
520
521 (void) __fsetlocking(f, FSETLOCKING_BYCALLER);
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 = new0(Manager, 1);
571 if (!m)
572 return -ENOMEM;
573
574 m->llmnr_ipv4_udp_fd = m->llmnr_ipv6_udp_fd = -1;
575 m->llmnr_ipv4_tcp_fd = m->llmnr_ipv6_tcp_fd = -1;
576 m->mdns_ipv4_fd = m->mdns_ipv6_fd = -1;
577 m->dns_stub_udp_fd = m->dns_stub_tcp_fd = -1;
578 m->hostname_fd = -1;
579
580 m->llmnr_support = RESOLVE_SUPPORT_YES;
581 m->mdns_support = RESOLVE_SUPPORT_YES;
582 m->dnssec_mode = DEFAULT_DNSSEC_MODE;
583 m->private_dns_mode = DEFAULT_PRIVATE_DNS_MODE;
584 m->enable_cache = true;
585 m->dns_stub_listener_mode = DNS_STUB_LISTENER_UDP;
586 m->read_resolv_conf = true;
587 m->need_builtin_fallbacks = true;
588 m->etc_hosts_last = m->etc_hosts_mtime = USEC_INFINITY;
589
590 r = dns_trust_anchor_load(&m->trust_anchor);
591 if (r < 0)
592 return r;
593
594 r = manager_parse_config_file(m);
595 if (r < 0)
596 log_warning_errno(r, "Failed to parse configuration file: %m");
597
598 r = sd_event_default(&m->event);
599 if (r < 0)
600 return r;
601
602 sd_event_add_signal(m->event, NULL, SIGTERM, NULL, NULL);
603 sd_event_add_signal(m->event, NULL, SIGINT, NULL, NULL);
604
605 sd_event_set_watchdog(m->event, true);
606
607 r = manager_watch_hostname(m);
608 if (r < 0)
609 return r;
610
611 r = dnssd_load(m);
612 if (r < 0)
613 log_warning_errno(r, "Failed to load DNS-SD configuration files: %m");
614
615 r = dns_scope_new(m, &m->unicast_scope, NULL, DNS_PROTOCOL_DNS, AF_UNSPEC);
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
631 (void) sd_event_add_signal(m->event, &m->sigusr1_event_source, SIGUSR1, manager_sigusr1, m);
632 (void) sd_event_add_signal(m->event, &m->sigusr2_event_source, SIGUSR2, manager_sigusr2, m);
633 (void) sd_event_add_signal(m->event, &m->sigrtmin1_event_source, SIGRTMIN+1, manager_sigrtmin1, m);
634
635 manager_cleanup_saved_user(m);
636
637 *ret = TAKE_PTR(m);
638
639 return 0;
640}
641
642int manager_start(Manager *m) {
643 int r;
644
645 assert(m);
646
647 r = manager_dns_stub_start(m);
648 if (r < 0)
649 return r;
650
651 return 0;
652}
653
654Manager *manager_free(Manager *m) {
655 Link *l;
656 DnssdService *s;
657
658 if (!m)
659 return NULL;
660
661 dns_server_unlink_all(m->dns_servers);
662 dns_server_unlink_all(m->fallback_dns_servers);
663 dns_search_domain_unlink_all(m->search_domains);
664
665 while ((l = hashmap_first(m->links)))
666 link_free(l);
667
668 while (m->dns_queries)
669 dns_query_free(m->dns_queries);
670
671 dns_scope_free(m->unicast_scope);
672
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
678 hashmap_free(m->links);
679 hashmap_free(m->dns_transactions);
680
681 sd_event_source_unref(m->network_event_source);
682 sd_network_monitor_unref(m->network_monitor);
683
684 sd_netlink_unref(m->rtnl);
685 sd_event_source_unref(m->rtnl_event_source);
686
687 manager_llmnr_stop(m);
688 manager_mdns_stop(m);
689 manager_dns_stub_stop(m);
690
691 sd_bus_slot_unref(m->prepare_for_sleep_slot);
692 sd_bus_unref(m->bus);
693
694 sd_event_source_unref(m->sigusr1_event_source);
695 sd_event_source_unref(m->sigusr2_event_source);
696 sd_event_source_unref(m->sigrtmin1_event_source);
697
698 sd_event_unref(m->event);
699
700 dns_resource_key_unref(m->llmnr_host_ipv4_key);
701 dns_resource_key_unref(m->llmnr_host_ipv6_key);
702 dns_resource_key_unref(m->mdns_host_ipv4_key);
703 dns_resource_key_unref(m->mdns_host_ipv6_key);
704
705 sd_event_source_unref(m->hostname_event_source);
706 safe_close(m->hostname_fd);
707
708 free(m->full_hostname);
709 free(m->llmnr_hostname);
710 free(m->mdns_hostname);
711
712 while ((s = hashmap_first(m->dnssd_services)))
713 dnssd_service_free(s);
714 hashmap_free(m->dnssd_services);
715
716 dns_trust_anchor_flush(&m->trust_anchor);
717 manager_etc_hosts_flush(m);
718
719 return mfree(m);
720}
721
722int manager_recv(Manager *m, int fd, DnsProtocol protocol, DnsPacket **ret) {
723 _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL;
724 union {
725 struct cmsghdr header; /* For alignment */
726 uint8_t buffer[CMSG_SPACE(MAXSIZE(struct in_pktinfo, struct in6_pktinfo))
727 + CMSG_SPACE(int) /* ttl/hoplimit */
728 + EXTRA_CMSG_SPACE /* kernel appears to require extra buffer space */];
729 } control;
730 union sockaddr_union sa;
731 struct msghdr mh = {};
732 struct cmsghdr *cmsg;
733 struct iovec iov;
734 ssize_t ms, l;
735 int r;
736
737 assert(m);
738 assert(fd >= 0);
739 assert(ret);
740
741 ms = next_datagram_size_fd(fd);
742 if (ms < 0)
743 return ms;
744
745 r = dns_packet_new(&p, protocol, ms, DNS_PACKET_SIZE_MAX);
746 if (r < 0)
747 return r;
748
749 iov.iov_base = DNS_PACKET_DATA(p);
750 iov.iov_len = p->allocated;
751
752 mh.msg_name = &sa.sa;
753 mh.msg_namelen = sizeof(sa);
754 mh.msg_iov = &iov;
755 mh.msg_iovlen = 1;
756 mh.msg_control = &control;
757 mh.msg_controllen = sizeof(control);
758
759 l = recvmsg(fd, &mh, 0);
760 if (l == 0)
761 return 0;
762 if (l < 0) {
763 if (IN_SET(errno, EAGAIN, EINTR))
764 return 0;
765
766 return -errno;
767 }
768
769 assert(!(mh.msg_flags & MSG_CTRUNC));
770 assert(!(mh.msg_flags & MSG_TRUNC));
771
772 p->size = (size_t) l;
773
774 p->family = sa.sa.sa_family;
775 p->ipproto = IPPROTO_UDP;
776 if (p->family == AF_INET) {
777 p->sender.in = sa.in.sin_addr;
778 p->sender_port = be16toh(sa.in.sin_port);
779 } else if (p->family == AF_INET6) {
780 p->sender.in6 = sa.in6.sin6_addr;
781 p->sender_port = be16toh(sa.in6.sin6_port);
782 p->ifindex = sa.in6.sin6_scope_id;
783 } else
784 return -EAFNOSUPPORT;
785
786 CMSG_FOREACH(cmsg, &mh) {
787
788 if (cmsg->cmsg_level == IPPROTO_IPV6) {
789 assert(p->family == AF_INET6);
790
791 switch (cmsg->cmsg_type) {
792
793 case IPV6_PKTINFO: {
794 struct in6_pktinfo *i = (struct in6_pktinfo*) CMSG_DATA(cmsg);
795
796 if (p->ifindex <= 0)
797 p->ifindex = i->ipi6_ifindex;
798
799 p->destination.in6 = i->ipi6_addr;
800 break;
801 }
802
803 case IPV6_HOPLIMIT:
804 p->ttl = *(int *) CMSG_DATA(cmsg);
805 break;
806
807 }
808 } else if (cmsg->cmsg_level == IPPROTO_IP) {
809 assert(p->family == AF_INET);
810
811 switch (cmsg->cmsg_type) {
812
813 case IP_PKTINFO: {
814 struct in_pktinfo *i = (struct in_pktinfo*) CMSG_DATA(cmsg);
815
816 if (p->ifindex <= 0)
817 p->ifindex = i->ipi_ifindex;
818
819 p->destination.in = i->ipi_addr;
820 break;
821 }
822
823 case IP_TTL:
824 p->ttl = *(int *) CMSG_DATA(cmsg);
825 break;
826 }
827 }
828 }
829
830 /* The Linux kernel sets the interface index to the loopback
831 * device if the packet came from the local host since it
832 * avoids the routing table in such a case. Let's unset the
833 * interface index in such a case. */
834 if (p->ifindex == LOOPBACK_IFINDEX)
835 p->ifindex = 0;
836
837 if (protocol != DNS_PROTOCOL_DNS) {
838 /* If we don't know the interface index still, we look for the
839 * first local interface with a matching address. Yuck! */
840 if (p->ifindex <= 0)
841 p->ifindex = manager_find_ifindex(m, p->family, &p->destination);
842 }
843
844 *ret = TAKE_PTR(p);
845
846 return 1;
847}
848
849static int sendmsg_loop(int fd, struct msghdr *mh, int flags) {
850 int r;
851
852 assert(fd >= 0);
853 assert(mh);
854
855 for (;;) {
856 if (sendmsg(fd, mh, flags) >= 0)
857 return 0;
858
859 if (errno == EINTR)
860 continue;
861
862 if (errno != EAGAIN)
863 return -errno;
864
865 r = fd_wait_for_event(fd, POLLOUT, SEND_TIMEOUT_USEC);
866 if (r < 0)
867 return r;
868 if (r == 0)
869 return -ETIMEDOUT;
870 }
871}
872
873static int write_loop(int fd, void *message, size_t length) {
874 int r;
875
876 assert(fd >= 0);
877 assert(message);
878
879 for (;;) {
880 if (write(fd, message, length) >= 0)
881 return 0;
882
883 if (errno == EINTR)
884 continue;
885
886 if (errno != EAGAIN)
887 return -errno;
888
889 r = fd_wait_for_event(fd, POLLOUT, SEND_TIMEOUT_USEC);
890 if (r < 0)
891 return r;
892 if (r == 0)
893 return -ETIMEDOUT;
894 }
895}
896
897int manager_write(Manager *m, int fd, DnsPacket *p) {
898 int r;
899
900 log_debug("Sending %s packet with id %" PRIu16 ".", DNS_PACKET_QR(p) ? "response" : "query", DNS_PACKET_ID(p));
901
902 r = write_loop(fd, DNS_PACKET_DATA(p), p->size);
903 if (r < 0)
904 return r;
905
906 return 0;
907}
908
909static int manager_ipv4_send(
910 Manager *m,
911 int fd,
912 int ifindex,
913 const struct in_addr *destination,
914 uint16_t port,
915 const struct in_addr *source,
916 DnsPacket *p) {
917 union sockaddr_union sa = {
918 .in.sin_family = AF_INET,
919 };
920 union {
921 struct cmsghdr header; /* For alignment */
922 uint8_t buffer[CMSG_SPACE(sizeof(struct in_pktinfo))];
923 } control;
924 struct msghdr mh = {};
925 struct iovec iov;
926
927 assert(m);
928 assert(fd >= 0);
929 assert(destination);
930 assert(port > 0);
931 assert(p);
932
933 iov.iov_base = DNS_PACKET_DATA(p);
934 iov.iov_len = p->size;
935
936 sa.in.sin_addr = *destination;
937 sa.in.sin_port = htobe16(port),
938
939 mh.msg_iov = &iov;
940 mh.msg_iovlen = 1;
941 mh.msg_name = &sa.sa;
942 mh.msg_namelen = sizeof(sa.in);
943
944 if (ifindex > 0) {
945 struct cmsghdr *cmsg;
946 struct in_pktinfo *pi;
947
948 zero(control);
949
950 mh.msg_control = &control;
951 mh.msg_controllen = CMSG_LEN(sizeof(struct in_pktinfo));
952
953 cmsg = CMSG_FIRSTHDR(&mh);
954 cmsg->cmsg_len = mh.msg_controllen;
955 cmsg->cmsg_level = IPPROTO_IP;
956 cmsg->cmsg_type = IP_PKTINFO;
957
958 pi = (struct in_pktinfo*) CMSG_DATA(cmsg);
959 pi->ipi_ifindex = ifindex;
960
961 if (source)
962 pi->ipi_spec_dst = *source;
963 }
964
965 return sendmsg_loop(fd, &mh, 0);
966}
967
968static int manager_ipv6_send(
969 Manager *m,
970 int fd,
971 int ifindex,
972 const struct in6_addr *destination,
973 uint16_t port,
974 const struct in6_addr *source,
975 DnsPacket *p) {
976
977 union sockaddr_union sa = {
978 .in6.sin6_family = AF_INET6,
979 };
980 union {
981 struct cmsghdr header; /* For alignment */
982 uint8_t buffer[CMSG_SPACE(sizeof(struct in6_pktinfo))];
983 } control;
984 struct msghdr mh = {};
985 struct iovec iov;
986
987 assert(m);
988 assert(fd >= 0);
989 assert(destination);
990 assert(port > 0);
991 assert(p);
992
993 iov.iov_base = DNS_PACKET_DATA(p);
994 iov.iov_len = p->size;
995
996 sa.in6.sin6_addr = *destination;
997 sa.in6.sin6_port = htobe16(port),
998 sa.in6.sin6_scope_id = ifindex;
999
1000 mh.msg_iov = &iov;
1001 mh.msg_iovlen = 1;
1002 mh.msg_name = &sa.sa;
1003 mh.msg_namelen = sizeof(sa.in6);
1004
1005 if (ifindex > 0) {
1006 struct cmsghdr *cmsg;
1007 struct in6_pktinfo *pi;
1008
1009 zero(control);
1010
1011 mh.msg_control = &control;
1012 mh.msg_controllen = CMSG_LEN(sizeof(struct in6_pktinfo));
1013
1014 cmsg = CMSG_FIRSTHDR(&mh);
1015 cmsg->cmsg_len = mh.msg_controllen;
1016 cmsg->cmsg_level = IPPROTO_IPV6;
1017 cmsg->cmsg_type = IPV6_PKTINFO;
1018
1019 pi = (struct in6_pktinfo*) CMSG_DATA(cmsg);
1020 pi->ipi6_ifindex = ifindex;
1021
1022 if (source)
1023 pi->ipi6_addr = *source;
1024 }
1025
1026 return sendmsg_loop(fd, &mh, 0);
1027}
1028
1029int manager_send(
1030 Manager *m,
1031 int fd,
1032 int ifindex,
1033 int family,
1034 const union in_addr_union *destination,
1035 uint16_t port,
1036 const union in_addr_union *source,
1037 DnsPacket *p) {
1038
1039 assert(m);
1040 assert(fd >= 0);
1041 assert(destination);
1042 assert(port > 0);
1043 assert(p);
1044
1045 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));
1046
1047 if (family == AF_INET)
1048 return manager_ipv4_send(m, fd, ifindex, &destination->in, port, &source->in, p);
1049 if (family == AF_INET6)
1050 return manager_ipv6_send(m, fd, ifindex, &destination->in6, port, &source->in6, p);
1051
1052 return -EAFNOSUPPORT;
1053}
1054
1055uint32_t manager_find_mtu(Manager *m) {
1056 uint32_t mtu = 0;
1057 Link *l;
1058 Iterator i;
1059
1060 /* If we don't know on which link a DNS packet would be
1061 * delivered, let's find the largest MTU that works on all
1062 * interfaces we know of */
1063
1064 HASHMAP_FOREACH(l, m->links, i) {
1065 if (l->mtu <= 0)
1066 continue;
1067
1068 if (mtu <= 0 || l->mtu < mtu)
1069 mtu = l->mtu;
1070 }
1071
1072 return mtu;
1073}
1074
1075int manager_find_ifindex(Manager *m, int family, const union in_addr_union *in_addr) {
1076 LinkAddress *a;
1077
1078 assert(m);
1079
1080 a = manager_find_link_address(m, family, in_addr);
1081 if (a)
1082 return a->link->ifindex;
1083
1084 return 0;
1085}
1086
1087void manager_refresh_rrs(Manager *m) {
1088 Iterator i;
1089 Link *l;
1090 DnssdService *s;
1091
1092 assert(m);
1093
1094 m->llmnr_host_ipv4_key = dns_resource_key_unref(m->llmnr_host_ipv4_key);
1095 m->llmnr_host_ipv6_key = dns_resource_key_unref(m->llmnr_host_ipv6_key);
1096 m->mdns_host_ipv4_key = dns_resource_key_unref(m->mdns_host_ipv4_key);
1097 m->mdns_host_ipv6_key = dns_resource_key_unref(m->mdns_host_ipv6_key);
1098
1099 if (m->mdns_support == RESOLVE_SUPPORT_YES)
1100 HASHMAP_FOREACH(s, m->dnssd_services, i)
1101 if (dnssd_update_rrs(s) < 0)
1102 log_warning("Failed to refresh DNS-SD service '%s'", s->name);
1103
1104 HASHMAP_FOREACH(l, m->links, i) {
1105 link_add_rrs(l, true);
1106 link_add_rrs(l, false);
1107 }
1108}
1109
1110static int manager_next_random_name(const char *old, char **ret_new) {
1111 const char *p;
1112 uint64_t u, a;
1113 char *n;
1114
1115 p = strchr(old, 0);
1116 assert(p);
1117
1118 while (p > old) {
1119 if (!strchr(DIGITS, p[-1]))
1120 break;
1121
1122 p--;
1123 }
1124
1125 if (*p == 0 || safe_atou64(p, &u) < 0 || u <= 0)
1126 u = 1;
1127
1128 /* Add a random number to the old value. This way we can avoid
1129 * that two hosts pick the same hostname, win on IPv4 and lose
1130 * on IPv6 (or vice versa), and pick the same hostname
1131 * replacement hostname, ad infinitum. We still want the
1132 * numbers to go up monotonically, hence we just add a random
1133 * value 1..10 */
1134
1135 random_bytes(&a, sizeof(a));
1136 u += 1 + a % 10;
1137
1138 if (asprintf(&n, "%.*s%" PRIu64, (int) (p - old), old, u) < 0)
1139 return -ENOMEM;
1140
1141 *ret_new = n;
1142
1143 return 0;
1144}
1145
1146int manager_next_hostname(Manager *m) {
1147 _cleanup_free_ char *h = NULL, *k = NULL;
1148 int r;
1149
1150 assert(m);
1151
1152 r = manager_next_random_name(m->llmnr_hostname, &h);
1153 if (r < 0)
1154 return r;
1155
1156 r = dns_name_concat(h, "local", &k);
1157 if (r < 0)
1158 return r;
1159
1160 log_info("Hostname conflict, changing published hostname from '%s' to '%s'.", m->llmnr_hostname, h);
1161
1162 free_and_replace(m->llmnr_hostname, h);
1163 free_and_replace(m->mdns_hostname, k);
1164
1165 manager_refresh_rrs(m);
1166
1167 return 0;
1168}
1169
1170LinkAddress* manager_find_link_address(Manager *m, int family, const union in_addr_union *in_addr) {
1171 Iterator i;
1172 Link *l;
1173
1174 assert(m);
1175
1176 HASHMAP_FOREACH(l, m->links, i) {
1177 LinkAddress *a;
1178
1179 a = link_find_address(l, family, in_addr);
1180 if (a)
1181 return a;
1182 }
1183
1184 return NULL;
1185}
1186
1187bool manager_our_packet(Manager *m, DnsPacket *p) {
1188 assert(m);
1189 assert(p);
1190
1191 return !!manager_find_link_address(m, p->family, &p->sender);
1192}
1193
1194DnsScope* manager_find_scope(Manager *m, DnsPacket *p) {
1195 Link *l;
1196
1197 assert(m);
1198 assert(p);
1199
1200 l = hashmap_get(m->links, INT_TO_PTR(p->ifindex));
1201 if (!l)
1202 return NULL;
1203
1204 switch (p->protocol) {
1205 case DNS_PROTOCOL_LLMNR:
1206 if (p->family == AF_INET)
1207 return l->llmnr_ipv4_scope;
1208 else if (p->family == AF_INET6)
1209 return l->llmnr_ipv6_scope;
1210
1211 break;
1212
1213 case DNS_PROTOCOL_MDNS:
1214 if (p->family == AF_INET)
1215 return l->mdns_ipv4_scope;
1216 else if (p->family == AF_INET6)
1217 return l->mdns_ipv6_scope;
1218
1219 break;
1220
1221 default:
1222 break;
1223 }
1224
1225 return NULL;
1226}
1227
1228void manager_verify_all(Manager *m) {
1229 DnsScope *s;
1230
1231 assert(m);
1232
1233 LIST_FOREACH(scopes, s, m->dns_scopes)
1234 dns_zone_verify_all(&s->zone);
1235}
1236
1237int manager_is_own_hostname(Manager *m, const char *name) {
1238 int r;
1239
1240 assert(m);
1241 assert(name);
1242
1243 if (m->llmnr_hostname) {
1244 r = dns_name_equal(name, m->llmnr_hostname);
1245 if (r != 0)
1246 return r;
1247 }
1248
1249 if (m->mdns_hostname) {
1250 r = dns_name_equal(name, m->mdns_hostname);
1251 if (r != 0)
1252 return r;
1253 }
1254
1255 if (m->full_hostname)
1256 return dns_name_equal(name, m->full_hostname);
1257
1258 return 0;
1259}
1260
1261int manager_compile_dns_servers(Manager *m, OrderedSet **dns) {
1262 DnsServer *s;
1263 Iterator i;
1264 Link *l;
1265 int r;
1266
1267 assert(m);
1268 assert(dns);
1269
1270 r = ordered_set_ensure_allocated(dns, &dns_server_hash_ops);
1271 if (r < 0)
1272 return r;
1273
1274 /* First add the system-wide servers and domains */
1275 LIST_FOREACH(servers, s, m->dns_servers) {
1276 r = ordered_set_put(*dns, s);
1277 if (r == -EEXIST)
1278 continue;
1279 if (r < 0)
1280 return r;
1281 }
1282
1283 /* Then, add the per-link servers */
1284 HASHMAP_FOREACH(l, m->links, i) {
1285 LIST_FOREACH(servers, s, l->dns_servers) {
1286 r = ordered_set_put(*dns, s);
1287 if (r == -EEXIST)
1288 continue;
1289 if (r < 0)
1290 return r;
1291 }
1292 }
1293
1294 /* If we found nothing, add the fallback servers */
1295 if (ordered_set_isempty(*dns)) {
1296 LIST_FOREACH(servers, s, m->fallback_dns_servers) {
1297 r = ordered_set_put(*dns, s);
1298 if (r == -EEXIST)
1299 continue;
1300 if (r < 0)
1301 return r;
1302 }
1303 }
1304
1305 return 0;
1306}
1307
1308/* filter_route is a tri-state:
1309 * < 0: no filtering
1310 * = 0 or false: return only domains which should be used for searching
1311 * > 0 or true: return only domains which are for routing only
1312 */
1313int manager_compile_search_domains(Manager *m, OrderedSet **domains, int filter_route) {
1314 DnsSearchDomain *d;
1315 Iterator i;
1316 Link *l;
1317 int r;
1318
1319 assert(m);
1320 assert(domains);
1321
1322 r = ordered_set_ensure_allocated(domains, &dns_name_hash_ops);
1323 if (r < 0)
1324 return r;
1325
1326 LIST_FOREACH(domains, d, m->search_domains) {
1327
1328 if (filter_route >= 0 &&
1329 d->route_only != !!filter_route)
1330 continue;
1331
1332 r = ordered_set_put(*domains, d->name);
1333 if (r == -EEXIST)
1334 continue;
1335 if (r < 0)
1336 return r;
1337 }
1338
1339 HASHMAP_FOREACH(l, m->links, i) {
1340
1341 LIST_FOREACH(domains, d, l->search_domains) {
1342
1343 if (filter_route >= 0 &&
1344 d->route_only != !!filter_route)
1345 continue;
1346
1347 r = ordered_set_put(*domains, d->name);
1348 if (r == -EEXIST)
1349 continue;
1350 if (r < 0)
1351 return r;
1352 }
1353 }
1354
1355 return 0;
1356}
1357
1358DnssecMode manager_get_dnssec_mode(Manager *m) {
1359 assert(m);
1360
1361 if (m->dnssec_mode != _DNSSEC_MODE_INVALID)
1362 return m->dnssec_mode;
1363
1364 return DNSSEC_NO;
1365}
1366
1367bool manager_dnssec_supported(Manager *m) {
1368 DnsServer *server;
1369 Iterator i;
1370 Link *l;
1371
1372 assert(m);
1373
1374 if (manager_get_dnssec_mode(m) == DNSSEC_NO)
1375 return false;
1376
1377 server = manager_get_dns_server(m);
1378 if (server && !dns_server_dnssec_supported(server))
1379 return false;
1380
1381 HASHMAP_FOREACH(l, m->links, i)
1382 if (!link_dnssec_supported(l))
1383 return false;
1384
1385 return true;
1386}
1387
1388PrivateDnsMode manager_get_private_dns_mode(Manager *m) {
1389 assert(m);
1390
1391 if (m->private_dns_mode != _PRIVATE_DNS_MODE_INVALID)
1392 return m->private_dns_mode;
1393
1394 return PRIVATE_DNS_NO;
1395}
1396
1397void manager_dnssec_verdict(Manager *m, DnssecVerdict verdict, const DnsResourceKey *key) {
1398
1399 assert(verdict >= 0);
1400 assert(verdict < _DNSSEC_VERDICT_MAX);
1401
1402 if (DEBUG_LOGGING) {
1403 char s[DNS_RESOURCE_KEY_STRING_MAX];
1404
1405 log_debug("Found verdict for lookup %s: %s",
1406 dns_resource_key_to_string(key, s, sizeof s),
1407 dnssec_verdict_to_string(verdict));
1408 }
1409
1410 m->n_dnssec_verdict[verdict]++;
1411}
1412
1413bool manager_routable(Manager *m, int family) {
1414 Iterator i;
1415 Link *l;
1416
1417 assert(m);
1418
1419 /* Returns true if the host has at least one interface with a routable address of the specified type */
1420
1421 HASHMAP_FOREACH(l, m->links, i)
1422 if (link_relevant(l, family, false))
1423 return true;
1424
1425 return false;
1426}
1427
1428void manager_flush_caches(Manager *m) {
1429 DnsScope *scope;
1430
1431 assert(m);
1432
1433 LIST_FOREACH(scopes, scope, m->dns_scopes)
1434 dns_cache_flush(&scope->cache);
1435
1436 log_info("Flushed all caches.");
1437}
1438
1439void manager_reset_server_features(Manager *m) {
1440 Iterator i;
1441 Link *l;
1442
1443 dns_server_reset_features_all(m->dns_servers);
1444 dns_server_reset_features_all(m->fallback_dns_servers);
1445
1446 HASHMAP_FOREACH(l, m->links, i)
1447 dns_server_reset_features_all(l->dns_servers);
1448
1449 log_info("Resetting learnt feature levels on all servers.");
1450}
1451
1452void manager_cleanup_saved_user(Manager *m) {
1453 _cleanup_closedir_ DIR *d = NULL;
1454 struct dirent *de;
1455 int r;
1456
1457 assert(m);
1458
1459 /* Clean up all saved per-link files in /run/systemd/resolve/netif/ that don't have a matching interface
1460 * anymore. These files are created to persist settings pushed in by the user via the bus, so that resolved can
1461 * be restarted without losing this data. */
1462
1463 d = opendir("/run/systemd/resolve/netif/");
1464 if (!d) {
1465 if (errno == ENOENT)
1466 return;
1467
1468 log_warning_errno(errno, "Failed to open interface directory: %m");
1469 return;
1470 }
1471
1472 FOREACH_DIRENT_ALL(de, d, log_error_errno(errno, "Failed to read interface directory: %m")) {
1473 _cleanup_free_ char *p = NULL;
1474 int ifindex;
1475 Link *l;
1476
1477 if (!IN_SET(de->d_type, DT_UNKNOWN, DT_REG))
1478 continue;
1479
1480 if (dot_or_dot_dot(de->d_name))
1481 continue;
1482
1483 r = parse_ifindex(de->d_name, &ifindex);
1484 if (r < 0) /* Probably some temporary file from a previous run. Delete it */
1485 goto rm;
1486
1487 l = hashmap_get(m->links, INT_TO_PTR(ifindex));
1488 if (!l) /* link vanished */
1489 goto rm;
1490
1491 if (l->is_managed) /* now managed by networkd, hence the bus settings are useless */
1492 goto rm;
1493
1494 continue;
1495
1496 rm:
1497 p = strappend("/run/systemd/resolve/netif/", de->d_name);
1498 if (!p) {
1499 log_oom();
1500 return;
1501 }
1502
1503 (void) unlink(p);
1504 }
1505}
1506
1507bool manager_next_dnssd_names(Manager *m) {
1508 Iterator i;
1509 DnssdService *s;
1510 bool tried = false;
1511 int r;
1512
1513 assert(m);
1514
1515 HASHMAP_FOREACH(s, m->dnssd_services, i) {
1516 _cleanup_free_ char * new_name = NULL;
1517
1518 if (!s->withdrawn)
1519 continue;
1520
1521 r = manager_next_random_name(s->name_template, &new_name);
1522 if (r < 0) {
1523 log_warning_errno(r, "Failed to get new name for service '%s': %m", s->name);
1524 continue;
1525 }
1526
1527 free_and_replace(s->name_template, new_name);
1528
1529 s->withdrawn = false;
1530
1531 tried = true;
1532 }
1533
1534 if (tried)
1535 manager_refresh_rrs(m);
1536
1537 return tried;
1538}
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