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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.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-dns-stub.h" | |
28 | #include "resolved-dnssd.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 | ||
41 | static 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 | ||
98 | fail: | |
99 | log_warning_errno(r, "Failed to process RTNL link message: %m"); | |
100 | return 0; | |
101 | } | |
102 | ||
103 | static 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 | ||
182 | fail: | |
183 | log_warning_errno(r, "Failed to process RTNL address message: %m"); | |
184 | return 0; | |
185 | } | |
186 | ||
187 | static 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 | ||
263 | static 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 | ||
284 | static 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 | ||
314 | static 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 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
341 | "Couldn't find a single label in hostname."); | |
342 | ||
343 | #if HAVE_LIBIDN2 | |
344 | r = idn2_to_unicode_8z8z(label, &utf8, 0); | |
345 | if (r != IDN2_OK) | |
346 | return log_error("Failed to undo IDNA: %s", idn2_strerror(r)); | |
347 | assert(utf8_is_valid(utf8)); | |
348 | ||
349 | r = strlen(utf8); | |
350 | decoded = utf8; | |
351 | #elif HAVE_LIBIDN | |
352 | k = dns_label_undo_idna(label, r, label, sizeof label); | |
353 | if (k < 0) | |
354 | return log_error_errno(k, "Failed to undo IDNA: %m"); | |
355 | if (k > 0) | |
356 | r = k; | |
357 | ||
358 | if (!utf8_is_valid(label)) | |
359 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
360 | "System hostname is not UTF-8 clean."); | |
361 | decoded = label; | |
362 | #else | |
363 | decoded = label; /* no decoding */ | |
364 | #endif | |
365 | ||
366 | r = dns_label_escape_new(decoded, r, &n); | |
367 | if (r < 0) | |
368 | return log_error_errno(r, "Failed to escape host name: %m"); | |
369 | ||
370 | if (is_localhost(n)) | |
371 | return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), | |
372 | "System hostname is 'localhost', ignoring."); | |
373 | ||
374 | r = dns_name_concat(n, "local", mdns_hostname); | |
375 | if (r < 0) | |
376 | return log_error_errno(r, "Failed to determine mDNS hostname: %m"); | |
377 | ||
378 | *llmnr_hostname = TAKE_PTR(n); | |
379 | *full_hostname = TAKE_PTR(h); | |
380 | ||
381 | return 0; | |
382 | } | |
383 | ||
384 | static const char *fallback_hostname(void) { | |
385 | ||
386 | /* Determine the fall back hostname. For exposing this system to the outside world, we cannot have it to be | |
387 | * "localhost" even if that's the compiled in hostname. In this case, let's revert to "linux" instead. */ | |
388 | ||
389 | if (is_localhost(FALLBACK_HOSTNAME)) | |
390 | return "linux"; | |
391 | ||
392 | return FALLBACK_HOSTNAME; | |
393 | } | |
394 | ||
395 | static int make_fallback_hostnames(char **full_hostname, char **llmnr_hostname, char **mdns_hostname) { | |
396 | _cleanup_free_ char *n = NULL, *m = NULL; | |
397 | char label[DNS_LABEL_MAX], *h; | |
398 | const char *p; | |
399 | int r; | |
400 | ||
401 | assert(full_hostname); | |
402 | assert(llmnr_hostname); | |
403 | assert(mdns_hostname); | |
404 | ||
405 | p = fallback_hostname(); | |
406 | r = dns_label_unescape(&p, label, sizeof(label)); | |
407 | if (r < 0) | |
408 | return log_error_errno(r, "Failed to unescape fallback host name: %m"); | |
409 | ||
410 | assert(r > 0); /* The fallback hostname must have at least one label */ | |
411 | ||
412 | r = dns_label_escape_new(label, r, &n); | |
413 | if (r < 0) | |
414 | return log_error_errno(r, "Failed to escape fallback hostname: %m"); | |
415 | ||
416 | r = dns_name_concat(n, "local", &m); | |
417 | if (r < 0) | |
418 | return log_error_errno(r, "Failed to concatenate mDNS hostname: %m"); | |
419 | ||
420 | h = strdup(fallback_hostname()); | |
421 | if (!h) | |
422 | return log_oom(); | |
423 | ||
424 | *llmnr_hostname = TAKE_PTR(n); | |
425 | *mdns_hostname = TAKE_PTR(m); | |
426 | ||
427 | *full_hostname = h; | |
428 | ||
429 | return 0; | |
430 | } | |
431 | ||
432 | static int on_hostname_change(sd_event_source *es, int fd, uint32_t revents, void *userdata) { | |
433 | _cleanup_free_ char *full_hostname = NULL, *llmnr_hostname = NULL, *mdns_hostname = NULL; | |
434 | Manager *m = userdata; | |
435 | int r; | |
436 | ||
437 | assert(m); | |
438 | ||
439 | r = determine_hostname(&full_hostname, &llmnr_hostname, &mdns_hostname); | |
440 | if (r < 0) | |
441 | return 0; /* ignore invalid hostnames */ | |
442 | ||
443 | if (streq(full_hostname, m->full_hostname) && | |
444 | streq(llmnr_hostname, m->llmnr_hostname) && | |
445 | streq(mdns_hostname, m->mdns_hostname)) | |
446 | return 0; | |
447 | ||
448 | log_info("System hostname changed to '%s'.", full_hostname); | |
449 | ||
450 | free_and_replace(m->full_hostname, full_hostname); | |
451 | free_and_replace(m->llmnr_hostname, llmnr_hostname); | |
452 | free_and_replace(m->mdns_hostname, mdns_hostname); | |
453 | ||
454 | manager_refresh_rrs(m); | |
455 | ||
456 | return 0; | |
457 | } | |
458 | ||
459 | static int manager_watch_hostname(Manager *m) { | |
460 | int r; | |
461 | ||
462 | assert(m); | |
463 | ||
464 | m->hostname_fd = open("/proc/sys/kernel/hostname", | |
465 | O_RDONLY|O_CLOEXEC|O_NONBLOCK|O_NOCTTY); | |
466 | if (m->hostname_fd < 0) { | |
467 | log_warning_errno(errno, "Failed to watch hostname: %m"); | |
468 | return 0; | |
469 | } | |
470 | ||
471 | r = sd_event_add_io(m->event, &m->hostname_event_source, m->hostname_fd, 0, on_hostname_change, m); | |
472 | if (r < 0) { | |
473 | if (r == -EPERM) | |
474 | /* kernels prior to 3.2 don't support polling this file. Ignore the failure. */ | |
475 | m->hostname_fd = safe_close(m->hostname_fd); | |
476 | else | |
477 | return log_error_errno(r, "Failed to add hostname event source: %m"); | |
478 | } | |
479 | ||
480 | (void) sd_event_source_set_description(m->hostname_event_source, "hostname"); | |
481 | ||
482 | r = determine_hostname(&m->full_hostname, &m->llmnr_hostname, &m->mdns_hostname); | |
483 | if (r < 0) { | |
484 | log_info("Defaulting to hostname '%s'.", fallback_hostname()); | |
485 | ||
486 | r = make_fallback_hostnames(&m->full_hostname, &m->llmnr_hostname, &m->mdns_hostname); | |
487 | if (r < 0) | |
488 | return r; | |
489 | } else | |
490 | log_info("Using system hostname '%s'.", m->full_hostname); | |
491 | ||
492 | return 0; | |
493 | } | |
494 | ||
495 | static int manager_sigusr1(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { | |
496 | _cleanup_free_ char *buffer = NULL; | |
497 | _cleanup_fclose_ FILE *f = NULL; | |
498 | Manager *m = userdata; | |
499 | DnsServer *server; | |
500 | size_t size = 0; | |
501 | DnsScope *scope; | |
502 | Iterator i; | |
503 | Link *l; | |
504 | ||
505 | assert(s); | |
506 | assert(si); | |
507 | assert(m); | |
508 | ||
509 | f = open_memstream(&buffer, &size); | |
510 | if (!f) | |
511 | return log_oom(); | |
512 | ||
513 | (void) __fsetlocking(f, FSETLOCKING_BYCALLER); | |
514 | ||
515 | LIST_FOREACH(scopes, scope, m->dns_scopes) | |
516 | dns_scope_dump(scope, f); | |
517 | ||
518 | LIST_FOREACH(servers, server, m->dns_servers) | |
519 | dns_server_dump(server, f); | |
520 | LIST_FOREACH(servers, server, m->fallback_dns_servers) | |
521 | dns_server_dump(server, f); | |
522 | HASHMAP_FOREACH(l, m->links, i) | |
523 | LIST_FOREACH(servers, server, l->dns_servers) | |
524 | dns_server_dump(server, f); | |
525 | ||
526 | if (fflush_and_check(f) < 0) | |
527 | return log_oom(); | |
528 | ||
529 | log_dump(LOG_INFO, buffer); | |
530 | return 0; | |
531 | } | |
532 | ||
533 | static int manager_sigusr2(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { | |
534 | Manager *m = userdata; | |
535 | ||
536 | assert(s); | |
537 | assert(si); | |
538 | assert(m); | |
539 | ||
540 | manager_flush_caches(m); | |
541 | ||
542 | return 0; | |
543 | } | |
544 | ||
545 | static int manager_sigrtmin1(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { | |
546 | Manager *m = userdata; | |
547 | ||
548 | assert(s); | |
549 | assert(si); | |
550 | assert(m); | |
551 | ||
552 | manager_reset_server_features(m); | |
553 | return 0; | |
554 | } | |
555 | ||
556 | int manager_new(Manager **ret) { | |
557 | _cleanup_(manager_freep) Manager *m = NULL; | |
558 | int r; | |
559 | ||
560 | assert(ret); | |
561 | ||
562 | m = new(Manager, 1); | |
563 | if (!m) | |
564 | return -ENOMEM; | |
565 | ||
566 | *m = (Manager) { | |
567 | .llmnr_ipv4_udp_fd = -1, | |
568 | .llmnr_ipv6_udp_fd = -1, | |
569 | .llmnr_ipv4_tcp_fd = -1, | |
570 | .llmnr_ipv6_tcp_fd = -1, | |
571 | .mdns_ipv4_fd = -1, | |
572 | .mdns_ipv6_fd = -1, | |
573 | .dns_stub_udp_fd = -1, | |
574 | .dns_stub_tcp_fd = -1, | |
575 | .hostname_fd = -1, | |
576 | ||
577 | .llmnr_support = RESOLVE_SUPPORT_YES, | |
578 | .mdns_support = RESOLVE_SUPPORT_YES, | |
579 | .dnssec_mode = DEFAULT_DNSSEC_MODE, | |
580 | .dns_over_tls_mode = DEFAULT_DNS_OVER_TLS_MODE, | |
581 | .enable_cache = true, | |
582 | .dns_stub_listener_mode = DNS_STUB_LISTENER_UDP, | |
583 | .read_resolv_conf = true, | |
584 | .need_builtin_fallbacks = true, | |
585 | .etc_hosts_last = USEC_INFINITY, | |
586 | .etc_hosts_mtime = USEC_INFINITY, | |
587 | .read_etc_hosts = true, | |
588 | }; | |
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 | (void) sd_event_add_signal(m->event, NULL, SIGTERM, NULL, NULL); | |
603 | (void) sd_event_add_signal(m->event, NULL, SIGINT, NULL, NULL); | |
604 | ||
605 | (void) 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 | ||
642 | int 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 | ||
654 | Manager *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_unref(m->bus); | |
692 | ||
693 | sd_event_source_unref(m->sigusr1_event_source); | |
694 | sd_event_source_unref(m->sigusr2_event_source); | |
695 | sd_event_source_unref(m->sigrtmin1_event_source); | |
696 | ||
697 | sd_event_unref(m->event); | |
698 | ||
699 | dns_resource_key_unref(m->llmnr_host_ipv4_key); | |
700 | dns_resource_key_unref(m->llmnr_host_ipv6_key); | |
701 | dns_resource_key_unref(m->mdns_host_ipv4_key); | |
702 | dns_resource_key_unref(m->mdns_host_ipv6_key); | |
703 | ||
704 | sd_event_source_unref(m->hostname_event_source); | |
705 | safe_close(m->hostname_fd); | |
706 | ||
707 | free(m->full_hostname); | |
708 | free(m->llmnr_hostname); | |
709 | free(m->mdns_hostname); | |
710 | ||
711 | while ((s = hashmap_first(m->dnssd_services))) | |
712 | dnssd_service_free(s); | |
713 | hashmap_free(m->dnssd_services); | |
714 | ||
715 | dns_trust_anchor_flush(&m->trust_anchor); | |
716 | manager_etc_hosts_flush(m); | |
717 | ||
718 | return mfree(m); | |
719 | } | |
720 | ||
721 | int manager_recv(Manager *m, int fd, DnsProtocol protocol, DnsPacket **ret) { | |
722 | _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL; | |
723 | union { | |
724 | struct cmsghdr header; /* For alignment */ | |
725 | uint8_t buffer[CMSG_SPACE(MAXSIZE(struct in_pktinfo, struct in6_pktinfo)) | |
726 | + CMSG_SPACE(int) /* ttl/hoplimit */ | |
727 | + EXTRA_CMSG_SPACE /* kernel appears to require extra buffer space */]; | |
728 | } control; | |
729 | union sockaddr_union sa; | |
730 | struct iovec iov; | |
731 | struct msghdr mh = { | |
732 | .msg_name = &sa.sa, | |
733 | .msg_namelen = sizeof(sa), | |
734 | .msg_iov = &iov, | |
735 | .msg_iovlen = 1, | |
736 | .msg_control = &control, | |
737 | .msg_controllen = sizeof(control), | |
738 | }; | |
739 | struct cmsghdr *cmsg; | |
740 | ssize_t ms, l; | |
741 | int r; | |
742 | ||
743 | assert(m); | |
744 | assert(fd >= 0); | |
745 | assert(ret); | |
746 | ||
747 | ms = next_datagram_size_fd(fd); | |
748 | if (ms < 0) | |
749 | return ms; | |
750 | ||
751 | r = dns_packet_new(&p, protocol, ms, DNS_PACKET_SIZE_MAX); | |
752 | if (r < 0) | |
753 | return r; | |
754 | ||
755 | iov = IOVEC_MAKE(DNS_PACKET_DATA(p), p->allocated); | |
756 | ||
757 | l = recvmsg(fd, &mh, 0); | |
758 | if (l < 0) { | |
759 | if (IN_SET(errno, EAGAIN, EINTR)) | |
760 | return 0; | |
761 | ||
762 | return -errno; | |
763 | } | |
764 | if (l == 0) | |
765 | return 0; | |
766 | ||
767 | assert(!(mh.msg_flags & MSG_CTRUNC)); | |
768 | assert(!(mh.msg_flags & MSG_TRUNC)); | |
769 | ||
770 | p->size = (size_t) l; | |
771 | ||
772 | p->family = sa.sa.sa_family; | |
773 | p->ipproto = IPPROTO_UDP; | |
774 | if (p->family == AF_INET) { | |
775 | p->sender.in = sa.in.sin_addr; | |
776 | p->sender_port = be16toh(sa.in.sin_port); | |
777 | } else if (p->family == AF_INET6) { | |
778 | p->sender.in6 = sa.in6.sin6_addr; | |
779 | p->sender_port = be16toh(sa.in6.sin6_port); | |
780 | p->ifindex = sa.in6.sin6_scope_id; | |
781 | } else | |
782 | return -EAFNOSUPPORT; | |
783 | ||
784 | CMSG_FOREACH(cmsg, &mh) { | |
785 | ||
786 | if (cmsg->cmsg_level == IPPROTO_IPV6) { | |
787 | assert(p->family == AF_INET6); | |
788 | ||
789 | switch (cmsg->cmsg_type) { | |
790 | ||
791 | case IPV6_PKTINFO: { | |
792 | struct in6_pktinfo *i = (struct in6_pktinfo*) CMSG_DATA(cmsg); | |
793 | ||
794 | if (p->ifindex <= 0) | |
795 | p->ifindex = i->ipi6_ifindex; | |
796 | ||
797 | p->destination.in6 = i->ipi6_addr; | |
798 | break; | |
799 | } | |
800 | ||
801 | case IPV6_HOPLIMIT: | |
802 | p->ttl = *(int *) CMSG_DATA(cmsg); | |
803 | break; | |
804 | ||
805 | } | |
806 | } else if (cmsg->cmsg_level == IPPROTO_IP) { | |
807 | assert(p->family == AF_INET); | |
808 | ||
809 | switch (cmsg->cmsg_type) { | |
810 | ||
811 | case IP_PKTINFO: { | |
812 | struct in_pktinfo *i = (struct in_pktinfo*) CMSG_DATA(cmsg); | |
813 | ||
814 | if (p->ifindex <= 0) | |
815 | p->ifindex = i->ipi_ifindex; | |
816 | ||
817 | p->destination.in = i->ipi_addr; | |
818 | break; | |
819 | } | |
820 | ||
821 | case IP_TTL: | |
822 | p->ttl = *(int *) CMSG_DATA(cmsg); | |
823 | break; | |
824 | } | |
825 | } | |
826 | } | |
827 | ||
828 | /* The Linux kernel sets the interface index to the loopback | |
829 | * device if the packet came from the local host since it | |
830 | * avoids the routing table in such a case. Let's unset the | |
831 | * interface index in such a case. */ | |
832 | if (p->ifindex == LOOPBACK_IFINDEX) | |
833 | p->ifindex = 0; | |
834 | ||
835 | if (protocol != DNS_PROTOCOL_DNS) { | |
836 | /* If we don't know the interface index still, we look for the | |
837 | * first local interface with a matching address. Yuck! */ | |
838 | if (p->ifindex <= 0) | |
839 | p->ifindex = manager_find_ifindex(m, p->family, &p->destination); | |
840 | } | |
841 | ||
842 | *ret = TAKE_PTR(p); | |
843 | ||
844 | return 1; | |
845 | } | |
846 | ||
847 | static int sendmsg_loop(int fd, struct msghdr *mh, int flags) { | |
848 | int r; | |
849 | ||
850 | assert(fd >= 0); | |
851 | assert(mh); | |
852 | ||
853 | for (;;) { | |
854 | if (sendmsg(fd, mh, flags) >= 0) | |
855 | return 0; | |
856 | ||
857 | if (errno == EINTR) | |
858 | continue; | |
859 | ||
860 | if (errno != EAGAIN) | |
861 | return -errno; | |
862 | ||
863 | r = fd_wait_for_event(fd, POLLOUT, SEND_TIMEOUT_USEC); | |
864 | if (r < 0) | |
865 | return r; | |
866 | if (r == 0) | |
867 | return -ETIMEDOUT; | |
868 | } | |
869 | } | |
870 | ||
871 | static int write_loop(int fd, void *message, size_t length) { | |
872 | int r; | |
873 | ||
874 | assert(fd >= 0); | |
875 | assert(message); | |
876 | ||
877 | for (;;) { | |
878 | if (write(fd, message, length) >= 0) | |
879 | return 0; | |
880 | ||
881 | if (errno == EINTR) | |
882 | continue; | |
883 | ||
884 | if (errno != EAGAIN) | |
885 | return -errno; | |
886 | ||
887 | r = fd_wait_for_event(fd, POLLOUT, SEND_TIMEOUT_USEC); | |
888 | if (r < 0) | |
889 | return r; | |
890 | if (r == 0) | |
891 | return -ETIMEDOUT; | |
892 | } | |
893 | } | |
894 | ||
895 | int manager_write(Manager *m, int fd, DnsPacket *p) { | |
896 | int r; | |
897 | ||
898 | log_debug("Sending %s packet with id %" PRIu16 ".", DNS_PACKET_QR(p) ? "response" : "query", DNS_PACKET_ID(p)); | |
899 | ||
900 | r = write_loop(fd, DNS_PACKET_DATA(p), p->size); | |
901 | if (r < 0) | |
902 | return r; | |
903 | ||
904 | return 0; | |
905 | } | |
906 | ||
907 | static int manager_ipv4_send( | |
908 | Manager *m, | |
909 | int fd, | |
910 | int ifindex, | |
911 | const struct in_addr *destination, | |
912 | uint16_t port, | |
913 | const struct in_addr *source, | |
914 | DnsPacket *p) { | |
915 | union { | |
916 | struct cmsghdr header; /* For alignment */ | |
917 | uint8_t buffer[CMSG_SPACE(sizeof(struct in_pktinfo))]; | |
918 | } control = {}; | |
919 | union sockaddr_union sa; | |
920 | struct iovec iov; | |
921 | struct msghdr mh = { | |
922 | .msg_iov = &iov, | |
923 | .msg_iovlen = 1, | |
924 | .msg_name = &sa.sa, | |
925 | .msg_namelen = sizeof(sa.in), | |
926 | }; | |
927 | ||
928 | assert(m); | |
929 | assert(fd >= 0); | |
930 | assert(destination); | |
931 | assert(port > 0); | |
932 | assert(p); | |
933 | ||
934 | iov = IOVEC_MAKE(DNS_PACKET_DATA(p), p->size); | |
935 | ||
936 | sa = (union sockaddr_union) { | |
937 | .in.sin_family = AF_INET, | |
938 | .in.sin_addr = *destination, | |
939 | .in.sin_port = htobe16(port), | |
940 | }; | |
941 | ||
942 | if (ifindex > 0) { | |
943 | struct cmsghdr *cmsg; | |
944 | struct in_pktinfo *pi; | |
945 | ||
946 | mh.msg_control = &control; | |
947 | mh.msg_controllen = CMSG_LEN(sizeof(struct in_pktinfo)); | |
948 | ||
949 | cmsg = CMSG_FIRSTHDR(&mh); | |
950 | cmsg->cmsg_len = mh.msg_controllen; | |
951 | cmsg->cmsg_level = IPPROTO_IP; | |
952 | cmsg->cmsg_type = IP_PKTINFO; | |
953 | ||
954 | pi = (struct in_pktinfo*) CMSG_DATA(cmsg); | |
955 | pi->ipi_ifindex = ifindex; | |
956 | ||
957 | if (source) | |
958 | pi->ipi_spec_dst = *source; | |
959 | } | |
960 | ||
961 | return sendmsg_loop(fd, &mh, 0); | |
962 | } | |
963 | ||
964 | static int manager_ipv6_send( | |
965 | Manager *m, | |
966 | int fd, | |
967 | int ifindex, | |
968 | const struct in6_addr *destination, | |
969 | uint16_t port, | |
970 | const struct in6_addr *source, | |
971 | DnsPacket *p) { | |
972 | ||
973 | union { | |
974 | struct cmsghdr header; /* For alignment */ | |
975 | uint8_t buffer[CMSG_SPACE(sizeof(struct in6_pktinfo))]; | |
976 | } control = {}; | |
977 | union sockaddr_union sa; | |
978 | struct iovec iov; | |
979 | struct msghdr mh = { | |
980 | .msg_iov = &iov, | |
981 | .msg_iovlen = 1, | |
982 | .msg_name = &sa.sa, | |
983 | .msg_namelen = sizeof(sa.in6), | |
984 | }; | |
985 | ||
986 | assert(m); | |
987 | assert(fd >= 0); | |
988 | assert(destination); | |
989 | assert(port > 0); | |
990 | assert(p); | |
991 | ||
992 | iov = IOVEC_MAKE(DNS_PACKET_DATA(p), p->size); | |
993 | ||
994 | sa = (union sockaddr_union) { | |
995 | .in6.sin6_family = AF_INET6, | |
996 | .in6.sin6_addr = *destination, | |
997 | .in6.sin6_port = htobe16(port), | |
998 | .in6.sin6_scope_id = ifindex, | |
999 | }; | |
1000 | ||
1001 | if (ifindex > 0) { | |
1002 | struct cmsghdr *cmsg; | |
1003 | struct in6_pktinfo *pi; | |
1004 | ||
1005 | mh.msg_control = &control; | |
1006 | mh.msg_controllen = CMSG_LEN(sizeof(struct in6_pktinfo)); | |
1007 | ||
1008 | cmsg = CMSG_FIRSTHDR(&mh); | |
1009 | cmsg->cmsg_len = mh.msg_controllen; | |
1010 | cmsg->cmsg_level = IPPROTO_IPV6; | |
1011 | cmsg->cmsg_type = IPV6_PKTINFO; | |
1012 | ||
1013 | pi = (struct in6_pktinfo*) CMSG_DATA(cmsg); | |
1014 | pi->ipi6_ifindex = ifindex; | |
1015 | ||
1016 | if (source) | |
1017 | pi->ipi6_addr = *source; | |
1018 | } | |
1019 | ||
1020 | return sendmsg_loop(fd, &mh, 0); | |
1021 | } | |
1022 | ||
1023 | int manager_send( | |
1024 | Manager *m, | |
1025 | int fd, | |
1026 | int ifindex, | |
1027 | int family, | |
1028 | const union in_addr_union *destination, | |
1029 | uint16_t port, | |
1030 | const union in_addr_union *source, | |
1031 | DnsPacket *p) { | |
1032 | ||
1033 | assert(m); | |
1034 | assert(fd >= 0); | |
1035 | assert(destination); | |
1036 | assert(port > 0); | |
1037 | assert(p); | |
1038 | ||
1039 | log_debug("Sending %s packet with id %" PRIu16 " on interface %i/%s.", DNS_PACKET_QR(p) ? "response" : "query", DNS_PACKET_ID(p), ifindex, af_to_name(family)); | |
1040 | ||
1041 | if (family == AF_INET) | |
1042 | return manager_ipv4_send(m, fd, ifindex, &destination->in, port, source ? &source->in : NULL, p); | |
1043 | if (family == AF_INET6) | |
1044 | return manager_ipv6_send(m, fd, ifindex, &destination->in6, port, source ? &source->in6 : NULL, p); | |
1045 | ||
1046 | return -EAFNOSUPPORT; | |
1047 | } | |
1048 | ||
1049 | uint32_t manager_find_mtu(Manager *m) { | |
1050 | uint32_t mtu = 0; | |
1051 | Link *l; | |
1052 | Iterator i; | |
1053 | ||
1054 | /* If we don't know on which link a DNS packet would be | |
1055 | * delivered, let's find the largest MTU that works on all | |
1056 | * interfaces we know of */ | |
1057 | ||
1058 | HASHMAP_FOREACH(l, m->links, i) { | |
1059 | if (l->mtu <= 0) | |
1060 | continue; | |
1061 | ||
1062 | if (mtu <= 0 || l->mtu < mtu) | |
1063 | mtu = l->mtu; | |
1064 | } | |
1065 | ||
1066 | return mtu; | |
1067 | } | |
1068 | ||
1069 | int manager_find_ifindex(Manager *m, int family, const union in_addr_union *in_addr) { | |
1070 | LinkAddress *a; | |
1071 | ||
1072 | assert(m); | |
1073 | ||
1074 | a = manager_find_link_address(m, family, in_addr); | |
1075 | if (a) | |
1076 | return a->link->ifindex; | |
1077 | ||
1078 | return 0; | |
1079 | } | |
1080 | ||
1081 | void manager_refresh_rrs(Manager *m) { | |
1082 | Iterator i; | |
1083 | Link *l; | |
1084 | DnssdService *s; | |
1085 | ||
1086 | assert(m); | |
1087 | ||
1088 | m->llmnr_host_ipv4_key = dns_resource_key_unref(m->llmnr_host_ipv4_key); | |
1089 | m->llmnr_host_ipv6_key = dns_resource_key_unref(m->llmnr_host_ipv6_key); | |
1090 | m->mdns_host_ipv4_key = dns_resource_key_unref(m->mdns_host_ipv4_key); | |
1091 | m->mdns_host_ipv6_key = dns_resource_key_unref(m->mdns_host_ipv6_key); | |
1092 | ||
1093 | if (m->mdns_support == RESOLVE_SUPPORT_YES) | |
1094 | HASHMAP_FOREACH(s, m->dnssd_services, i) | |
1095 | if (dnssd_update_rrs(s) < 0) | |
1096 | log_warning("Failed to refresh DNS-SD service '%s'", s->name); | |
1097 | ||
1098 | HASHMAP_FOREACH(l, m->links, i) { | |
1099 | link_add_rrs(l, true); | |
1100 | link_add_rrs(l, false); | |
1101 | } | |
1102 | } | |
1103 | ||
1104 | static int manager_next_random_name(const char *old, char **ret_new) { | |
1105 | const char *p; | |
1106 | uint64_t u, a; | |
1107 | char *n; | |
1108 | ||
1109 | p = strchr(old, 0); | |
1110 | assert(p); | |
1111 | ||
1112 | while (p > old) { | |
1113 | if (!strchr(DIGITS, p[-1])) | |
1114 | break; | |
1115 | ||
1116 | p--; | |
1117 | } | |
1118 | ||
1119 | if (*p == 0 || safe_atou64(p, &u) < 0 || u <= 0) | |
1120 | u = 1; | |
1121 | ||
1122 | /* Add a random number to the old value. This way we can avoid | |
1123 | * that two hosts pick the same hostname, win on IPv4 and lose | |
1124 | * on IPv6 (or vice versa), and pick the same hostname | |
1125 | * replacement hostname, ad infinitum. We still want the | |
1126 | * numbers to go up monotonically, hence we just add a random | |
1127 | * value 1..10 */ | |
1128 | ||
1129 | random_bytes(&a, sizeof(a)); | |
1130 | u += 1 + a % 10; | |
1131 | ||
1132 | if (asprintf(&n, "%.*s%" PRIu64, (int) (p - old), old, u) < 0) | |
1133 | return -ENOMEM; | |
1134 | ||
1135 | *ret_new = n; | |
1136 | ||
1137 | return 0; | |
1138 | } | |
1139 | ||
1140 | int manager_next_hostname(Manager *m) { | |
1141 | _cleanup_free_ char *h = NULL, *k = NULL; | |
1142 | int r; | |
1143 | ||
1144 | assert(m); | |
1145 | ||
1146 | r = manager_next_random_name(m->llmnr_hostname, &h); | |
1147 | if (r < 0) | |
1148 | return r; | |
1149 | ||
1150 | r = dns_name_concat(h, "local", &k); | |
1151 | if (r < 0) | |
1152 | return r; | |
1153 | ||
1154 | log_info("Hostname conflict, changing published hostname from '%s' to '%s'.", m->llmnr_hostname, h); | |
1155 | ||
1156 | free_and_replace(m->llmnr_hostname, h); | |
1157 | free_and_replace(m->mdns_hostname, k); | |
1158 | ||
1159 | manager_refresh_rrs(m); | |
1160 | ||
1161 | return 0; | |
1162 | } | |
1163 | ||
1164 | LinkAddress* manager_find_link_address(Manager *m, int family, const union in_addr_union *in_addr) { | |
1165 | Iterator i; | |
1166 | Link *l; | |
1167 | ||
1168 | assert(m); | |
1169 | ||
1170 | HASHMAP_FOREACH(l, m->links, i) { | |
1171 | LinkAddress *a; | |
1172 | ||
1173 | a = link_find_address(l, family, in_addr); | |
1174 | if (a) | |
1175 | return a; | |
1176 | } | |
1177 | ||
1178 | return NULL; | |
1179 | } | |
1180 | ||
1181 | bool manager_our_packet(Manager *m, DnsPacket *p) { | |
1182 | assert(m); | |
1183 | assert(p); | |
1184 | ||
1185 | return !!manager_find_link_address(m, p->family, &p->sender); | |
1186 | } | |
1187 | ||
1188 | DnsScope* manager_find_scope(Manager *m, DnsPacket *p) { | |
1189 | Link *l; | |
1190 | ||
1191 | assert(m); | |
1192 | assert(p); | |
1193 | ||
1194 | l = hashmap_get(m->links, INT_TO_PTR(p->ifindex)); | |
1195 | if (!l) | |
1196 | return NULL; | |
1197 | ||
1198 | switch (p->protocol) { | |
1199 | case DNS_PROTOCOL_LLMNR: | |
1200 | if (p->family == AF_INET) | |
1201 | return l->llmnr_ipv4_scope; | |
1202 | else if (p->family == AF_INET6) | |
1203 | return l->llmnr_ipv6_scope; | |
1204 | ||
1205 | break; | |
1206 | ||
1207 | case DNS_PROTOCOL_MDNS: | |
1208 | if (p->family == AF_INET) | |
1209 | return l->mdns_ipv4_scope; | |
1210 | else if (p->family == AF_INET6) | |
1211 | return l->mdns_ipv6_scope; | |
1212 | ||
1213 | break; | |
1214 | ||
1215 | default: | |
1216 | break; | |
1217 | } | |
1218 | ||
1219 | return NULL; | |
1220 | } | |
1221 | ||
1222 | void manager_verify_all(Manager *m) { | |
1223 | DnsScope *s; | |
1224 | ||
1225 | assert(m); | |
1226 | ||
1227 | LIST_FOREACH(scopes, s, m->dns_scopes) | |
1228 | dns_zone_verify_all(&s->zone); | |
1229 | } | |
1230 | ||
1231 | int manager_is_own_hostname(Manager *m, const char *name) { | |
1232 | int r; | |
1233 | ||
1234 | assert(m); | |
1235 | assert(name); | |
1236 | ||
1237 | if (m->llmnr_hostname) { | |
1238 | r = dns_name_equal(name, m->llmnr_hostname); | |
1239 | if (r != 0) | |
1240 | return r; | |
1241 | } | |
1242 | ||
1243 | if (m->mdns_hostname) { | |
1244 | r = dns_name_equal(name, m->mdns_hostname); | |
1245 | if (r != 0) | |
1246 | return r; | |
1247 | } | |
1248 | ||
1249 | if (m->full_hostname) | |
1250 | return dns_name_equal(name, m->full_hostname); | |
1251 | ||
1252 | return 0; | |
1253 | } | |
1254 | ||
1255 | int manager_compile_dns_servers(Manager *m, OrderedSet **dns) { | |
1256 | DnsServer *s; | |
1257 | Iterator i; | |
1258 | Link *l; | |
1259 | int r; | |
1260 | ||
1261 | assert(m); | |
1262 | assert(dns); | |
1263 | ||
1264 | r = ordered_set_ensure_allocated(dns, &dns_server_hash_ops); | |
1265 | if (r < 0) | |
1266 | return r; | |
1267 | ||
1268 | /* First add the system-wide servers and domains */ | |
1269 | LIST_FOREACH(servers, s, m->dns_servers) { | |
1270 | r = ordered_set_put(*dns, s); | |
1271 | if (r == -EEXIST) | |
1272 | continue; | |
1273 | if (r < 0) | |
1274 | return r; | |
1275 | } | |
1276 | ||
1277 | /* Then, add the per-link servers */ | |
1278 | HASHMAP_FOREACH(l, m->links, i) { | |
1279 | LIST_FOREACH(servers, s, l->dns_servers) { | |
1280 | r = ordered_set_put(*dns, s); | |
1281 | if (r == -EEXIST) | |
1282 | continue; | |
1283 | if (r < 0) | |
1284 | return r; | |
1285 | } | |
1286 | } | |
1287 | ||
1288 | /* If we found nothing, add the fallback servers */ | |
1289 | if (ordered_set_isempty(*dns)) { | |
1290 | LIST_FOREACH(servers, s, m->fallback_dns_servers) { | |
1291 | r = ordered_set_put(*dns, s); | |
1292 | if (r == -EEXIST) | |
1293 | continue; | |
1294 | if (r < 0) | |
1295 | return r; | |
1296 | } | |
1297 | } | |
1298 | ||
1299 | return 0; | |
1300 | } | |
1301 | ||
1302 | /* filter_route is a tri-state: | |
1303 | * < 0: no filtering | |
1304 | * = 0 or false: return only domains which should be used for searching | |
1305 | * > 0 or true: return only domains which are for routing only | |
1306 | */ | |
1307 | int manager_compile_search_domains(Manager *m, OrderedSet **domains, int filter_route) { | |
1308 | DnsSearchDomain *d; | |
1309 | Iterator i; | |
1310 | Link *l; | |
1311 | int r; | |
1312 | ||
1313 | assert(m); | |
1314 | assert(domains); | |
1315 | ||
1316 | r = ordered_set_ensure_allocated(domains, &dns_name_hash_ops); | |
1317 | if (r < 0) | |
1318 | return r; | |
1319 | ||
1320 | LIST_FOREACH(domains, d, m->search_domains) { | |
1321 | ||
1322 | if (filter_route >= 0 && | |
1323 | d->route_only != !!filter_route) | |
1324 | continue; | |
1325 | ||
1326 | r = ordered_set_put(*domains, d->name); | |
1327 | if (r == -EEXIST) | |
1328 | continue; | |
1329 | if (r < 0) | |
1330 | return r; | |
1331 | } | |
1332 | ||
1333 | HASHMAP_FOREACH(l, m->links, i) { | |
1334 | ||
1335 | LIST_FOREACH(domains, d, l->search_domains) { | |
1336 | ||
1337 | if (filter_route >= 0 && | |
1338 | d->route_only != !!filter_route) | |
1339 | continue; | |
1340 | ||
1341 | r = ordered_set_put(*domains, d->name); | |
1342 | if (r == -EEXIST) | |
1343 | continue; | |
1344 | if (r < 0) | |
1345 | return r; | |
1346 | } | |
1347 | } | |
1348 | ||
1349 | return 0; | |
1350 | } | |
1351 | ||
1352 | DnssecMode manager_get_dnssec_mode(Manager *m) { | |
1353 | assert(m); | |
1354 | ||
1355 | if (m->dnssec_mode != _DNSSEC_MODE_INVALID) | |
1356 | return m->dnssec_mode; | |
1357 | ||
1358 | return DNSSEC_NO; | |
1359 | } | |
1360 | ||
1361 | bool manager_dnssec_supported(Manager *m) { | |
1362 | DnsServer *server; | |
1363 | Iterator i; | |
1364 | Link *l; | |
1365 | ||
1366 | assert(m); | |
1367 | ||
1368 | if (manager_get_dnssec_mode(m) == DNSSEC_NO) | |
1369 | return false; | |
1370 | ||
1371 | server = manager_get_dns_server(m); | |
1372 | if (server && !dns_server_dnssec_supported(server)) | |
1373 | return false; | |
1374 | ||
1375 | HASHMAP_FOREACH(l, m->links, i) | |
1376 | if (!link_dnssec_supported(l)) | |
1377 | return false; | |
1378 | ||
1379 | return true; | |
1380 | } | |
1381 | ||
1382 | DnsOverTlsMode manager_get_dns_over_tls_mode(Manager *m) { | |
1383 | assert(m); | |
1384 | ||
1385 | if (m->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID) | |
1386 | return m->dns_over_tls_mode; | |
1387 | ||
1388 | return DNS_OVER_TLS_NO; | |
1389 | } | |
1390 | ||
1391 | void manager_dnssec_verdict(Manager *m, DnssecVerdict verdict, const DnsResourceKey *key) { | |
1392 | ||
1393 | assert(verdict >= 0); | |
1394 | assert(verdict < _DNSSEC_VERDICT_MAX); | |
1395 | ||
1396 | if (DEBUG_LOGGING) { | |
1397 | char s[DNS_RESOURCE_KEY_STRING_MAX]; | |
1398 | ||
1399 | log_debug("Found verdict for lookup %s: %s", | |
1400 | dns_resource_key_to_string(key, s, sizeof s), | |
1401 | dnssec_verdict_to_string(verdict)); | |
1402 | } | |
1403 | ||
1404 | m->n_dnssec_verdict[verdict]++; | |
1405 | } | |
1406 | ||
1407 | bool manager_routable(Manager *m, int family) { | |
1408 | Iterator i; | |
1409 | Link *l; | |
1410 | ||
1411 | assert(m); | |
1412 | ||
1413 | /* Returns true if the host has at least one interface with a routable address of the specified type */ | |
1414 | ||
1415 | HASHMAP_FOREACH(l, m->links, i) | |
1416 | if (link_relevant(l, family, false)) | |
1417 | return true; | |
1418 | ||
1419 | return false; | |
1420 | } | |
1421 | ||
1422 | void manager_flush_caches(Manager *m) { | |
1423 | DnsScope *scope; | |
1424 | ||
1425 | assert(m); | |
1426 | ||
1427 | LIST_FOREACH(scopes, scope, m->dns_scopes) | |
1428 | dns_cache_flush(&scope->cache); | |
1429 | ||
1430 | log_info("Flushed all caches."); | |
1431 | } | |
1432 | ||
1433 | void manager_reset_server_features(Manager *m) { | |
1434 | Iterator i; | |
1435 | Link *l; | |
1436 | ||
1437 | dns_server_reset_features_all(m->dns_servers); | |
1438 | dns_server_reset_features_all(m->fallback_dns_servers); | |
1439 | ||
1440 | HASHMAP_FOREACH(l, m->links, i) | |
1441 | dns_server_reset_features_all(l->dns_servers); | |
1442 | ||
1443 | log_info("Resetting learnt feature levels on all servers."); | |
1444 | } | |
1445 | ||
1446 | void manager_cleanup_saved_user(Manager *m) { | |
1447 | _cleanup_closedir_ DIR *d = NULL; | |
1448 | struct dirent *de; | |
1449 | int r; | |
1450 | ||
1451 | assert(m); | |
1452 | ||
1453 | /* Clean up all saved per-link files in /run/systemd/resolve/netif/ that don't have a matching interface | |
1454 | * anymore. These files are created to persist settings pushed in by the user via the bus, so that resolved can | |
1455 | * be restarted without losing this data. */ | |
1456 | ||
1457 | d = opendir("/run/systemd/resolve/netif/"); | |
1458 | if (!d) { | |
1459 | if (errno == ENOENT) | |
1460 | return; | |
1461 | ||
1462 | log_warning_errno(errno, "Failed to open interface directory: %m"); | |
1463 | return; | |
1464 | } | |
1465 | ||
1466 | FOREACH_DIRENT_ALL(de, d, log_error_errno(errno, "Failed to read interface directory: %m")) { | |
1467 | _cleanup_free_ char *p = NULL; | |
1468 | int ifindex; | |
1469 | Link *l; | |
1470 | ||
1471 | if (!IN_SET(de->d_type, DT_UNKNOWN, DT_REG)) | |
1472 | continue; | |
1473 | ||
1474 | if (dot_or_dot_dot(de->d_name)) | |
1475 | continue; | |
1476 | ||
1477 | r = parse_ifindex(de->d_name, &ifindex); | |
1478 | if (r < 0) /* Probably some temporary file from a previous run. Delete it */ | |
1479 | goto rm; | |
1480 | ||
1481 | l = hashmap_get(m->links, INT_TO_PTR(ifindex)); | |
1482 | if (!l) /* link vanished */ | |
1483 | goto rm; | |
1484 | ||
1485 | if (l->is_managed) /* now managed by networkd, hence the bus settings are useless */ | |
1486 | goto rm; | |
1487 | ||
1488 | continue; | |
1489 | ||
1490 | rm: | |
1491 | p = strappend("/run/systemd/resolve/netif/", de->d_name); | |
1492 | if (!p) { | |
1493 | log_oom(); | |
1494 | return; | |
1495 | } | |
1496 | ||
1497 | (void) unlink(p); | |
1498 | } | |
1499 | } | |
1500 | ||
1501 | bool manager_next_dnssd_names(Manager *m) { | |
1502 | Iterator i; | |
1503 | DnssdService *s; | |
1504 | bool tried = false; | |
1505 | int r; | |
1506 | ||
1507 | assert(m); | |
1508 | ||
1509 | HASHMAP_FOREACH(s, m->dnssd_services, i) { | |
1510 | _cleanup_free_ char * new_name = NULL; | |
1511 | ||
1512 | if (!s->withdrawn) | |
1513 | continue; | |
1514 | ||
1515 | r = manager_next_random_name(s->name_template, &new_name); | |
1516 | if (r < 0) { | |
1517 | log_warning_errno(r, "Failed to get new name for service '%s': %m", s->name); | |
1518 | continue; | |
1519 | } | |
1520 | ||
1521 | free_and_replace(s->name_template, new_name); | |
1522 | ||
1523 | s->withdrawn = false; | |
1524 | ||
1525 | tried = true; | |
1526 | } | |
1527 | ||
1528 | if (tried) | |
1529 | manager_refresh_rrs(m); | |
1530 | ||
1531 | return tried; | |
1532 | } |