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1 | /* SPDX-License-Identifier: LGPL-2.1+ */ | |
2 | ||
3 | #include <fcntl.h> | |
4 | #include <netinet/in.h> | |
5 | #include <poll.h> | |
6 | #include <sys/ioctl.h> | |
7 | #include <sys/stat.h> | |
8 | #include <sys/types.h> | |
9 | #include <unistd.h> | |
10 | ||
11 | #if HAVE_LIBIDN2 | |
12 | #include <idn2.h> | |
13 | #endif | |
14 | ||
15 | #include "af-list.h" | |
16 | #include "alloc-util.h" | |
17 | #include "dirent-util.h" | |
18 | #include "dns-domain.h" | |
19 | #include "fd-util.h" | |
20 | #include "fileio.h" | |
21 | #include "hostname-util.h" | |
22 | #include "io-util.h" | |
23 | #include "missing_network.h" | |
24 | #include "netlink-util.h" | |
25 | #include "network-internal.h" | |
26 | #include "ordered-set.h" | |
27 | #include "parse-util.h" | |
28 | #include "random-util.h" | |
29 | #include "resolved-bus.h" | |
30 | #include "resolved-conf.h" | |
31 | #include "resolved-dns-stub.h" | |
32 | #include "resolved-dnssd.h" | |
33 | #include "resolved-etc-hosts.h" | |
34 | #include "resolved-llmnr.h" | |
35 | #include "resolved-manager.h" | |
36 | #include "resolved-mdns.h" | |
37 | #include "resolved-resolv-conf.h" | |
38 | #include "socket-util.h" | |
39 | #include "string-table.h" | |
40 | #include "string-util.h" | |
41 | #include "utf8.h" | |
42 | ||
43 | #define SEND_TIMEOUT_USEC (200 * USEC_PER_MSEC) | |
44 | ||
45 | static int manager_process_link(sd_netlink *rtnl, sd_netlink_message *mm, void *userdata) { | |
46 | Manager *m = userdata; | |
47 | uint16_t type; | |
48 | Link *l; | |
49 | int ifindex, r; | |
50 | ||
51 | assert(rtnl); | |
52 | assert(m); | |
53 | assert(mm); | |
54 | ||
55 | r = sd_netlink_message_get_type(mm, &type); | |
56 | if (r < 0) | |
57 | goto fail; | |
58 | ||
59 | r = sd_rtnl_message_link_get_ifindex(mm, &ifindex); | |
60 | if (r < 0) | |
61 | goto fail; | |
62 | ||
63 | l = hashmap_get(m->links, INT_TO_PTR(ifindex)); | |
64 | ||
65 | switch (type) { | |
66 | ||
67 | case RTM_NEWLINK:{ | |
68 | bool is_new = !l; | |
69 | ||
70 | if (!l) { | |
71 | r = link_new(m, &l, ifindex); | |
72 | if (r < 0) | |
73 | goto fail; | |
74 | } | |
75 | ||
76 | r = link_process_rtnl(l, mm); | |
77 | if (r < 0) | |
78 | goto fail; | |
79 | ||
80 | r = link_update(l); | |
81 | if (r < 0) | |
82 | goto fail; | |
83 | ||
84 | if (is_new) | |
85 | log_debug("Found new link %i/%s", ifindex, l->ifname); | |
86 | ||
87 | break; | |
88 | } | |
89 | ||
90 | case RTM_DELLINK: | |
91 | if (l) { | |
92 | log_debug("Removing link %i/%s", l->ifindex, l->ifname); | |
93 | link_remove_user(l); | |
94 | link_free(l); | |
95 | } | |
96 | ||
97 | break; | |
98 | } | |
99 | ||
100 | return 0; | |
101 | ||
102 | fail: | |
103 | log_warning_errno(r, "Failed to process RTNL link message: %m"); | |
104 | return 0; | |
105 | } | |
106 | ||
107 | static int manager_process_address(sd_netlink *rtnl, sd_netlink_message *mm, void *userdata) { | |
108 | Manager *m = userdata; | |
109 | union in_addr_union address; | |
110 | uint16_t type; | |
111 | int r, ifindex, family; | |
112 | LinkAddress *a; | |
113 | Link *l; | |
114 | ||
115 | assert(rtnl); | |
116 | assert(mm); | |
117 | assert(m); | |
118 | ||
119 | r = sd_netlink_message_get_type(mm, &type); | |
120 | if (r < 0) | |
121 | goto fail; | |
122 | ||
123 | r = sd_rtnl_message_addr_get_ifindex(mm, &ifindex); | |
124 | if (r < 0) | |
125 | goto fail; | |
126 | ||
127 | l = hashmap_get(m->links, INT_TO_PTR(ifindex)); | |
128 | if (!l) | |
129 | return 0; | |
130 | ||
131 | r = sd_rtnl_message_addr_get_family(mm, &family); | |
132 | if (r < 0) | |
133 | goto fail; | |
134 | ||
135 | switch (family) { | |
136 | ||
137 | case AF_INET: | |
138 | r = sd_netlink_message_read_in_addr(mm, IFA_LOCAL, &address.in); | |
139 | if (r < 0) { | |
140 | r = sd_netlink_message_read_in_addr(mm, IFA_ADDRESS, &address.in); | |
141 | if (r < 0) | |
142 | goto fail; | |
143 | } | |
144 | ||
145 | break; | |
146 | ||
147 | case AF_INET6: | |
148 | r = sd_netlink_message_read_in6_addr(mm, IFA_LOCAL, &address.in6); | |
149 | if (r < 0) { | |
150 | r = sd_netlink_message_read_in6_addr(mm, IFA_ADDRESS, &address.in6); | |
151 | if (r < 0) | |
152 | goto fail; | |
153 | } | |
154 | ||
155 | break; | |
156 | ||
157 | default: | |
158 | return 0; | |
159 | } | |
160 | ||
161 | a = link_find_address(l, family, &address); | |
162 | ||
163 | switch (type) { | |
164 | ||
165 | case RTM_NEWADDR: | |
166 | ||
167 | if (!a) { | |
168 | r = link_address_new(l, &a, family, &address); | |
169 | if (r < 0) | |
170 | return r; | |
171 | } | |
172 | ||
173 | r = link_address_update_rtnl(a, mm); | |
174 | if (r < 0) | |
175 | return r; | |
176 | ||
177 | break; | |
178 | ||
179 | case RTM_DELADDR: | |
180 | link_address_free(a); | |
181 | break; | |
182 | } | |
183 | ||
184 | return 0; | |
185 | ||
186 | fail: | |
187 | log_warning_errno(r, "Failed to process RTNL address message: %m"); | |
188 | return 0; | |
189 | } | |
190 | ||
191 | static int manager_rtnl_listen(Manager *m) { | |
192 | _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL; | |
193 | sd_netlink_message *i; | |
194 | int r; | |
195 | ||
196 | assert(m); | |
197 | ||
198 | /* First, subscribe to interfaces coming and going */ | |
199 | r = sd_netlink_open(&m->rtnl); | |
200 | if (r < 0) | |
201 | return r; | |
202 | ||
203 | r = sd_netlink_attach_event(m->rtnl, m->event, SD_EVENT_PRIORITY_IMPORTANT); | |
204 | if (r < 0) | |
205 | return r; | |
206 | ||
207 | r = sd_netlink_add_match(m->rtnl, NULL, RTM_NEWLINK, manager_process_link, NULL, m, "resolve-NEWLINK"); | |
208 | if (r < 0) | |
209 | return r; | |
210 | ||
211 | r = sd_netlink_add_match(m->rtnl, NULL, RTM_DELLINK, manager_process_link, NULL, m, "resolve-DELLINK"); | |
212 | if (r < 0) | |
213 | return r; | |
214 | ||
215 | r = sd_netlink_add_match(m->rtnl, NULL, RTM_NEWADDR, manager_process_address, NULL, m, "resolve-NEWADDR"); | |
216 | if (r < 0) | |
217 | return r; | |
218 | ||
219 | r = sd_netlink_add_match(m->rtnl, NULL, RTM_DELADDR, manager_process_address, NULL, m, "resolve-DELADDR"); | |
220 | if (r < 0) | |
221 | return r; | |
222 | ||
223 | /* Then, enumerate all links */ | |
224 | r = sd_rtnl_message_new_link(m->rtnl, &req, RTM_GETLINK, 0); | |
225 | if (r < 0) | |
226 | return r; | |
227 | ||
228 | r = sd_netlink_message_request_dump(req, true); | |
229 | if (r < 0) | |
230 | return r; | |
231 | ||
232 | r = sd_netlink_call(m->rtnl, req, 0, &reply); | |
233 | if (r < 0) | |
234 | return r; | |
235 | ||
236 | for (i = reply; i; i = sd_netlink_message_next(i)) { | |
237 | r = manager_process_link(m->rtnl, i, m); | |
238 | if (r < 0) | |
239 | return r; | |
240 | } | |
241 | ||
242 | req = sd_netlink_message_unref(req); | |
243 | reply = sd_netlink_message_unref(reply); | |
244 | ||
245 | /* Finally, enumerate all addresses, too */ | |
246 | r = sd_rtnl_message_new_addr(m->rtnl, &req, RTM_GETADDR, 0, AF_UNSPEC); | |
247 | if (r < 0) | |
248 | return r; | |
249 | ||
250 | r = sd_netlink_message_request_dump(req, true); | |
251 | if (r < 0) | |
252 | return r; | |
253 | ||
254 | r = sd_netlink_call(m->rtnl, req, 0, &reply); | |
255 | if (r < 0) | |
256 | return r; | |
257 | ||
258 | for (i = reply; i; i = sd_netlink_message_next(i)) { | |
259 | r = manager_process_address(m->rtnl, i, m); | |
260 | if (r < 0) | |
261 | return r; | |
262 | } | |
263 | ||
264 | return r; | |
265 | } | |
266 | ||
267 | static int on_network_event(sd_event_source *s, int fd, uint32_t revents, void *userdata) { | |
268 | Manager *m = userdata; | |
269 | Iterator i; | |
270 | Link *l; | |
271 | int r; | |
272 | ||
273 | assert(m); | |
274 | ||
275 | sd_network_monitor_flush(m->network_monitor); | |
276 | ||
277 | HASHMAP_FOREACH(l, m->links, i) { | |
278 | r = link_update(l); | |
279 | if (r < 0) | |
280 | log_warning_errno(r, "Failed to update monitor information for %i: %m", l->ifindex); | |
281 | } | |
282 | ||
283 | (void) manager_write_resolv_conf(m); | |
284 | ||
285 | return 0; | |
286 | } | |
287 | ||
288 | static int manager_network_monitor_listen(Manager *m) { | |
289 | int r, fd, events; | |
290 | ||
291 | assert(m); | |
292 | ||
293 | r = sd_network_monitor_new(&m->network_monitor, NULL); | |
294 | if (r < 0) | |
295 | return r; | |
296 | ||
297 | fd = sd_network_monitor_get_fd(m->network_monitor); | |
298 | if (fd < 0) | |
299 | return fd; | |
300 | ||
301 | events = sd_network_monitor_get_events(m->network_monitor); | |
302 | if (events < 0) | |
303 | return events; | |
304 | ||
305 | r = sd_event_add_io(m->event, &m->network_event_source, fd, events, &on_network_event, m); | |
306 | if (r < 0) | |
307 | return r; | |
308 | ||
309 | r = sd_event_source_set_priority(m->network_event_source, SD_EVENT_PRIORITY_IMPORTANT+5); | |
310 | if (r < 0) | |
311 | return r; | |
312 | ||
313 | (void) sd_event_source_set_description(m->network_event_source, "network-monitor"); | |
314 | ||
315 | return 0; | |
316 | } | |
317 | ||
318 | static int determine_hostname(char **full_hostname, char **llmnr_hostname, char **mdns_hostname) { | |
319 | _cleanup_free_ char *h = NULL, *n = NULL; | |
320 | #if HAVE_LIBIDN2 | |
321 | _cleanup_free_ char *utf8 = NULL; | |
322 | #elif HAVE_LIBIDN | |
323 | int k; | |
324 | #endif | |
325 | char label[DNS_LABEL_MAX]; | |
326 | const char *p, *decoded; | |
327 | int r; | |
328 | ||
329 | assert(full_hostname); | |
330 | assert(llmnr_hostname); | |
331 | assert(mdns_hostname); | |
332 | ||
333 | /* Extract and normalize the first label of the locally configured hostname, and check it's not "localhost". */ | |
334 | ||
335 | r = gethostname_strict(&h); | |
336 | if (r < 0) | |
337 | return log_debug_errno(r, "Can't determine system hostname: %m"); | |
338 | ||
339 | p = h; | |
340 | r = dns_label_unescape(&p, label, sizeof label, 0); | |
341 | if (r < 0) | |
342 | return log_error_errno(r, "Failed to unescape host name: %m"); | |
343 | if (r == 0) | |
344 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
345 | "Couldn't find a single label in hostname."); | |
346 | ||
347 | #if HAVE_LIBIDN2 | |
348 | r = idn2_to_unicode_8z8z(label, &utf8, 0); | |
349 | if (r != IDN2_OK) | |
350 | return log_error("Failed to undo IDNA: %s", idn2_strerror(r)); | |
351 | assert(utf8_is_valid(utf8)); | |
352 | ||
353 | r = strlen(utf8); | |
354 | decoded = utf8; | |
355 | #elif HAVE_LIBIDN | |
356 | k = dns_label_undo_idna(label, r, label, sizeof label); | |
357 | if (k < 0) | |
358 | return log_error_errno(k, "Failed to undo IDNA: %m"); | |
359 | if (k > 0) | |
360 | r = k; | |
361 | ||
362 | if (!utf8_is_valid(label)) | |
363 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
364 | "System hostname is not UTF-8 clean."); | |
365 | decoded = label; | |
366 | #else | |
367 | decoded = label; /* no decoding */ | |
368 | #endif | |
369 | ||
370 | r = dns_label_escape_new(decoded, r, &n); | |
371 | if (r < 0) | |
372 | return log_error_errno(r, "Failed to escape host name: %m"); | |
373 | ||
374 | if (is_localhost(n)) | |
375 | return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), | |
376 | "System hostname is 'localhost', ignoring."); | |
377 | ||
378 | r = dns_name_concat(n, "local", 0, mdns_hostname); | |
379 | if (r < 0) | |
380 | return log_error_errno(r, "Failed to determine mDNS hostname: %m"); | |
381 | ||
382 | *llmnr_hostname = TAKE_PTR(n); | |
383 | *full_hostname = TAKE_PTR(h); | |
384 | ||
385 | return 0; | |
386 | } | |
387 | ||
388 | static const char *fallback_hostname(void) { | |
389 | ||
390 | /* Determine the fall back hostname. For exposing this system to the outside world, we cannot have it to be | |
391 | * "localhost" even if that's the compiled in hostname. In this case, let's revert to "linux" instead. */ | |
392 | ||
393 | if (is_localhost(FALLBACK_HOSTNAME)) | |
394 | return "linux"; | |
395 | ||
396 | return FALLBACK_HOSTNAME; | |
397 | } | |
398 | ||
399 | static int make_fallback_hostnames(char **full_hostname, char **llmnr_hostname, char **mdns_hostname) { | |
400 | _cleanup_free_ char *n = NULL, *m = NULL; | |
401 | char label[DNS_LABEL_MAX], *h; | |
402 | const char *p; | |
403 | int r; | |
404 | ||
405 | assert(full_hostname); | |
406 | assert(llmnr_hostname); | |
407 | assert(mdns_hostname); | |
408 | ||
409 | p = fallback_hostname(); | |
410 | r = dns_label_unescape(&p, label, sizeof label, 0); | |
411 | if (r < 0) | |
412 | return log_error_errno(r, "Failed to unescape fallback host name: %m"); | |
413 | ||
414 | assert(r > 0); /* The fallback hostname must have at least one label */ | |
415 | ||
416 | r = dns_label_escape_new(label, r, &n); | |
417 | if (r < 0) | |
418 | return log_error_errno(r, "Failed to escape fallback hostname: %m"); | |
419 | ||
420 | r = dns_name_concat(n, "local", 0, &m); | |
421 | if (r < 0) | |
422 | return log_error_errno(r, "Failed to concatenate mDNS hostname: %m"); | |
423 | ||
424 | h = strdup(fallback_hostname()); | |
425 | if (!h) | |
426 | return log_oom(); | |
427 | ||
428 | *llmnr_hostname = TAKE_PTR(n); | |
429 | *mdns_hostname = TAKE_PTR(m); | |
430 | ||
431 | *full_hostname = h; | |
432 | ||
433 | return 0; | |
434 | } | |
435 | ||
436 | static int on_hostname_change(sd_event_source *es, int fd, uint32_t revents, void *userdata) { | |
437 | _cleanup_free_ char *full_hostname = NULL, *llmnr_hostname = NULL, *mdns_hostname = NULL; | |
438 | Manager *m = userdata; | |
439 | int r; | |
440 | ||
441 | assert(m); | |
442 | ||
443 | r = determine_hostname(&full_hostname, &llmnr_hostname, &mdns_hostname); | |
444 | if (r < 0) | |
445 | return 0; /* ignore invalid hostnames */ | |
446 | ||
447 | if (streq(full_hostname, m->full_hostname) && | |
448 | streq(llmnr_hostname, m->llmnr_hostname) && | |
449 | streq(mdns_hostname, m->mdns_hostname)) | |
450 | return 0; | |
451 | ||
452 | log_info("System hostname changed to '%s'.", full_hostname); | |
453 | ||
454 | free_and_replace(m->full_hostname, full_hostname); | |
455 | free_and_replace(m->llmnr_hostname, llmnr_hostname); | |
456 | free_and_replace(m->mdns_hostname, mdns_hostname); | |
457 | ||
458 | manager_refresh_rrs(m); | |
459 | ||
460 | return 0; | |
461 | } | |
462 | ||
463 | static int manager_watch_hostname(Manager *m) { | |
464 | int r; | |
465 | ||
466 | assert(m); | |
467 | ||
468 | m->hostname_fd = open("/proc/sys/kernel/hostname", | |
469 | O_RDONLY|O_CLOEXEC|O_NONBLOCK|O_NOCTTY); | |
470 | if (m->hostname_fd < 0) { | |
471 | log_warning_errno(errno, "Failed to watch hostname: %m"); | |
472 | return 0; | |
473 | } | |
474 | ||
475 | r = sd_event_add_io(m->event, &m->hostname_event_source, m->hostname_fd, 0, on_hostname_change, m); | |
476 | if (r < 0) { | |
477 | if (r == -EPERM) | |
478 | /* kernels prior to 3.2 don't support polling this file. Ignore the failure. */ | |
479 | m->hostname_fd = safe_close(m->hostname_fd); | |
480 | else | |
481 | return log_error_errno(r, "Failed to add hostname event source: %m"); | |
482 | } | |
483 | ||
484 | (void) sd_event_source_set_description(m->hostname_event_source, "hostname"); | |
485 | ||
486 | r = determine_hostname(&m->full_hostname, &m->llmnr_hostname, &m->mdns_hostname); | |
487 | if (r < 0) { | |
488 | log_info("Defaulting to hostname '%s'.", fallback_hostname()); | |
489 | ||
490 | r = make_fallback_hostnames(&m->full_hostname, &m->llmnr_hostname, &m->mdns_hostname); | |
491 | if (r < 0) | |
492 | return r; | |
493 | } else | |
494 | log_info("Using system hostname '%s'.", m->full_hostname); | |
495 | ||
496 | return 0; | |
497 | } | |
498 | ||
499 | static int manager_sigusr1(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { | |
500 | _cleanup_free_ char *buffer = NULL; | |
501 | _cleanup_fclose_ FILE *f = NULL; | |
502 | Manager *m = userdata; | |
503 | DnsServer *server; | |
504 | size_t size = 0; | |
505 | DnsScope *scope; | |
506 | Iterator i; | |
507 | Link *l; | |
508 | ||
509 | assert(s); | |
510 | assert(si); | |
511 | assert(m); | |
512 | ||
513 | f = open_memstream_unlocked(&buffer, &size); | |
514 | if (!f) | |
515 | return log_oom(); | |
516 | ||
517 | LIST_FOREACH(scopes, scope, m->dns_scopes) | |
518 | dns_scope_dump(scope, f); | |
519 | ||
520 | LIST_FOREACH(servers, server, m->dns_servers) | |
521 | dns_server_dump(server, f); | |
522 | LIST_FOREACH(servers, server, m->fallback_dns_servers) | |
523 | dns_server_dump(server, f); | |
524 | HASHMAP_FOREACH(l, m->links, i) | |
525 | LIST_FOREACH(servers, server, l->dns_servers) | |
526 | dns_server_dump(server, f); | |
527 | ||
528 | if (fflush_and_check(f) < 0) | |
529 | return log_oom(); | |
530 | ||
531 | log_dump(LOG_INFO, buffer); | |
532 | return 0; | |
533 | } | |
534 | ||
535 | static int manager_sigusr2(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { | |
536 | Manager *m = userdata; | |
537 | ||
538 | assert(s); | |
539 | assert(si); | |
540 | assert(m); | |
541 | ||
542 | manager_flush_caches(m); | |
543 | ||
544 | return 0; | |
545 | } | |
546 | ||
547 | static int manager_sigrtmin1(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { | |
548 | Manager *m = userdata; | |
549 | ||
550 | assert(s); | |
551 | assert(si); | |
552 | assert(m); | |
553 | ||
554 | manager_reset_server_features(m); | |
555 | return 0; | |
556 | } | |
557 | ||
558 | int manager_new(Manager **ret) { | |
559 | _cleanup_(manager_freep) Manager *m = NULL; | |
560 | int r; | |
561 | ||
562 | assert(ret); | |
563 | ||
564 | m = new(Manager, 1); | |
565 | if (!m) | |
566 | return -ENOMEM; | |
567 | ||
568 | *m = (Manager) { | |
569 | .llmnr_ipv4_udp_fd = -1, | |
570 | .llmnr_ipv6_udp_fd = -1, | |
571 | .llmnr_ipv4_tcp_fd = -1, | |
572 | .llmnr_ipv6_tcp_fd = -1, | |
573 | .mdns_ipv4_fd = -1, | |
574 | .mdns_ipv6_fd = -1, | |
575 | .dns_stub_udp_fd = -1, | |
576 | .dns_stub_tcp_fd = -1, | |
577 | .hostname_fd = -1, | |
578 | ||
579 | .llmnr_support = RESOLVE_SUPPORT_YES, | |
580 | .mdns_support = RESOLVE_SUPPORT_YES, | |
581 | .dnssec_mode = DEFAULT_DNSSEC_MODE, | |
582 | .dns_over_tls_mode = DEFAULT_DNS_OVER_TLS_MODE, | |
583 | .enable_cache = true, | |
584 | .dns_stub_listener_mode = DNS_STUB_LISTENER_YES, | |
585 | .read_resolv_conf = true, | |
586 | .need_builtin_fallbacks = true, | |
587 | .etc_hosts_last = USEC_INFINITY, | |
588 | .etc_hosts_mtime = USEC_INFINITY, | |
589 | .read_etc_hosts = true, | |
590 | }; | |
591 | ||
592 | r = dns_trust_anchor_load(&m->trust_anchor); | |
593 | if (r < 0) | |
594 | return r; | |
595 | ||
596 | r = manager_parse_config_file(m); | |
597 | if (r < 0) | |
598 | log_warning_errno(r, "Failed to parse configuration file: %m"); | |
599 | ||
600 | #if ENABLE_DNS_OVER_TLS | |
601 | dnstls_manager_init(m); | |
602 | #endif | |
603 | ||
604 | r = sd_event_default(&m->event); | |
605 | if (r < 0) | |
606 | return r; | |
607 | ||
608 | (void) sd_event_add_signal(m->event, NULL, SIGTERM, NULL, NULL); | |
609 | (void) sd_event_add_signal(m->event, NULL, SIGINT, NULL, NULL); | |
610 | ||
611 | (void) sd_event_set_watchdog(m->event, true); | |
612 | ||
613 | r = manager_watch_hostname(m); | |
614 | if (r < 0) | |
615 | return r; | |
616 | ||
617 | r = dnssd_load(m); | |
618 | if (r < 0) | |
619 | log_warning_errno(r, "Failed to load DNS-SD configuration files: %m"); | |
620 | ||
621 | r = dns_scope_new(m, &m->unicast_scope, NULL, DNS_PROTOCOL_DNS, AF_UNSPEC); | |
622 | if (r < 0) | |
623 | return r; | |
624 | ||
625 | r = manager_network_monitor_listen(m); | |
626 | if (r < 0) | |
627 | return r; | |
628 | ||
629 | r = manager_rtnl_listen(m); | |
630 | if (r < 0) | |
631 | return r; | |
632 | ||
633 | r = manager_connect_bus(m); | |
634 | if (r < 0) | |
635 | return r; | |
636 | ||
637 | (void) sd_event_add_signal(m->event, &m->sigusr1_event_source, SIGUSR1, manager_sigusr1, m); | |
638 | (void) sd_event_add_signal(m->event, &m->sigusr2_event_source, SIGUSR2, manager_sigusr2, m); | |
639 | (void) sd_event_add_signal(m->event, &m->sigrtmin1_event_source, SIGRTMIN+1, manager_sigrtmin1, m); | |
640 | ||
641 | manager_cleanup_saved_user(m); | |
642 | ||
643 | *ret = TAKE_PTR(m); | |
644 | ||
645 | return 0; | |
646 | } | |
647 | ||
648 | int manager_start(Manager *m) { | |
649 | int r; | |
650 | ||
651 | assert(m); | |
652 | ||
653 | r = manager_dns_stub_start(m); | |
654 | if (r < 0) | |
655 | return r; | |
656 | ||
657 | return 0; | |
658 | } | |
659 | ||
660 | Manager *manager_free(Manager *m) { | |
661 | Link *l; | |
662 | DnssdService *s; | |
663 | ||
664 | if (!m) | |
665 | return NULL; | |
666 | ||
667 | dns_server_unlink_all(m->dns_servers); | |
668 | dns_server_unlink_all(m->fallback_dns_servers); | |
669 | dns_search_domain_unlink_all(m->search_domains); | |
670 | ||
671 | while ((l = hashmap_first(m->links))) | |
672 | link_free(l); | |
673 | ||
674 | while (m->dns_queries) | |
675 | dns_query_free(m->dns_queries); | |
676 | ||
677 | dns_scope_free(m->unicast_scope); | |
678 | ||
679 | /* At this point only orphaned streams should remain. All others should have been freed already by their | |
680 | * owners */ | |
681 | while (m->dns_streams) | |
682 | dns_stream_unref(m->dns_streams); | |
683 | ||
684 | #if ENABLE_DNS_OVER_TLS | |
685 | dnstls_manager_free(m); | |
686 | #endif | |
687 | ||
688 | hashmap_free(m->links); | |
689 | hashmap_free(m->dns_transactions); | |
690 | ||
691 | sd_event_source_unref(m->network_event_source); | |
692 | sd_network_monitor_unref(m->network_monitor); | |
693 | ||
694 | sd_netlink_unref(m->rtnl); | |
695 | sd_event_source_unref(m->rtnl_event_source); | |
696 | ||
697 | manager_llmnr_stop(m); | |
698 | manager_mdns_stop(m); | |
699 | manager_dns_stub_stop(m); | |
700 | ||
701 | sd_bus_flush_close_unref(m->bus); | |
702 | ||
703 | sd_event_source_unref(m->sigusr1_event_source); | |
704 | sd_event_source_unref(m->sigusr2_event_source); | |
705 | sd_event_source_unref(m->sigrtmin1_event_source); | |
706 | ||
707 | sd_event_unref(m->event); | |
708 | ||
709 | dns_resource_key_unref(m->llmnr_host_ipv4_key); | |
710 | dns_resource_key_unref(m->llmnr_host_ipv6_key); | |
711 | dns_resource_key_unref(m->mdns_host_ipv4_key); | |
712 | dns_resource_key_unref(m->mdns_host_ipv6_key); | |
713 | ||
714 | sd_event_source_unref(m->hostname_event_source); | |
715 | safe_close(m->hostname_fd); | |
716 | ||
717 | free(m->full_hostname); | |
718 | free(m->llmnr_hostname); | |
719 | free(m->mdns_hostname); | |
720 | ||
721 | while ((s = hashmap_first(m->dnssd_services))) | |
722 | dnssd_service_free(s); | |
723 | hashmap_free(m->dnssd_services); | |
724 | ||
725 | dns_trust_anchor_flush(&m->trust_anchor); | |
726 | manager_etc_hosts_flush(m); | |
727 | ||
728 | return mfree(m); | |
729 | } | |
730 | ||
731 | int manager_recv(Manager *m, int fd, DnsProtocol protocol, DnsPacket **ret) { | |
732 | _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL; | |
733 | union { | |
734 | struct cmsghdr header; /* For alignment */ | |
735 | uint8_t buffer[CMSG_SPACE(MAXSIZE(struct in_pktinfo, struct in6_pktinfo)) | |
736 | + CMSG_SPACE(int) /* ttl/hoplimit */ | |
737 | + EXTRA_CMSG_SPACE /* kernel appears to require extra buffer space */]; | |
738 | } control; | |
739 | union sockaddr_union sa; | |
740 | struct iovec iov; | |
741 | struct msghdr mh = { | |
742 | .msg_name = &sa.sa, | |
743 | .msg_namelen = sizeof(sa), | |
744 | .msg_iov = &iov, | |
745 | .msg_iovlen = 1, | |
746 | .msg_control = &control, | |
747 | .msg_controllen = sizeof(control), | |
748 | }; | |
749 | struct cmsghdr *cmsg; | |
750 | ssize_t ms, l; | |
751 | int r; | |
752 | ||
753 | assert(m); | |
754 | assert(fd >= 0); | |
755 | assert(ret); | |
756 | ||
757 | ms = next_datagram_size_fd(fd); | |
758 | if (ms < 0) | |
759 | return ms; | |
760 | ||
761 | r = dns_packet_new(&p, protocol, ms, DNS_PACKET_SIZE_MAX); | |
762 | if (r < 0) | |
763 | return r; | |
764 | ||
765 | iov = IOVEC_MAKE(DNS_PACKET_DATA(p), p->allocated); | |
766 | ||
767 | l = recvmsg(fd, &mh, 0); | |
768 | if (l < 0) { | |
769 | if (IN_SET(errno, EAGAIN, EINTR)) | |
770 | return 0; | |
771 | ||
772 | return -errno; | |
773 | } | |
774 | if (l == 0) | |
775 | return 0; | |
776 | ||
777 | assert(!(mh.msg_flags & MSG_CTRUNC)); | |
778 | assert(!(mh.msg_flags & MSG_TRUNC)); | |
779 | ||
780 | p->size = (size_t) l; | |
781 | ||
782 | p->family = sa.sa.sa_family; | |
783 | p->ipproto = IPPROTO_UDP; | |
784 | if (p->family == AF_INET) { | |
785 | p->sender.in = sa.in.sin_addr; | |
786 | p->sender_port = be16toh(sa.in.sin_port); | |
787 | } else if (p->family == AF_INET6) { | |
788 | p->sender.in6 = sa.in6.sin6_addr; | |
789 | p->sender_port = be16toh(sa.in6.sin6_port); | |
790 | p->ifindex = sa.in6.sin6_scope_id; | |
791 | } else | |
792 | return -EAFNOSUPPORT; | |
793 | ||
794 | CMSG_FOREACH(cmsg, &mh) { | |
795 | ||
796 | if (cmsg->cmsg_level == IPPROTO_IPV6) { | |
797 | assert(p->family == AF_INET6); | |
798 | ||
799 | switch (cmsg->cmsg_type) { | |
800 | ||
801 | case IPV6_PKTINFO: { | |
802 | struct in6_pktinfo *i = (struct in6_pktinfo*) CMSG_DATA(cmsg); | |
803 | ||
804 | if (p->ifindex <= 0) | |
805 | p->ifindex = i->ipi6_ifindex; | |
806 | ||
807 | p->destination.in6 = i->ipi6_addr; | |
808 | break; | |
809 | } | |
810 | ||
811 | case IPV6_HOPLIMIT: | |
812 | p->ttl = *(int *) CMSG_DATA(cmsg); | |
813 | break; | |
814 | ||
815 | } | |
816 | } else if (cmsg->cmsg_level == IPPROTO_IP) { | |
817 | assert(p->family == AF_INET); | |
818 | ||
819 | switch (cmsg->cmsg_type) { | |
820 | ||
821 | case IP_PKTINFO: { | |
822 | struct in_pktinfo *i = (struct in_pktinfo*) CMSG_DATA(cmsg); | |
823 | ||
824 | if (p->ifindex <= 0) | |
825 | p->ifindex = i->ipi_ifindex; | |
826 | ||
827 | p->destination.in = i->ipi_addr; | |
828 | break; | |
829 | } | |
830 | ||
831 | case IP_TTL: | |
832 | p->ttl = *(int *) CMSG_DATA(cmsg); | |
833 | break; | |
834 | } | |
835 | } | |
836 | } | |
837 | ||
838 | /* The Linux kernel sets the interface index to the loopback | |
839 | * device if the packet came from the local host since it | |
840 | * avoids the routing table in such a case. Let's unset the | |
841 | * interface index in such a case. */ | |
842 | if (p->ifindex == LOOPBACK_IFINDEX) | |
843 | p->ifindex = 0; | |
844 | ||
845 | if (protocol != DNS_PROTOCOL_DNS) { | |
846 | /* If we don't know the interface index still, we look for the | |
847 | * first local interface with a matching address. Yuck! */ | |
848 | if (p->ifindex <= 0) | |
849 | p->ifindex = manager_find_ifindex(m, p->family, &p->destination); | |
850 | } | |
851 | ||
852 | *ret = TAKE_PTR(p); | |
853 | ||
854 | return 1; | |
855 | } | |
856 | ||
857 | static int sendmsg_loop(int fd, struct msghdr *mh, int flags) { | |
858 | int r; | |
859 | ||
860 | assert(fd >= 0); | |
861 | assert(mh); | |
862 | ||
863 | for (;;) { | |
864 | if (sendmsg(fd, mh, flags) >= 0) | |
865 | return 0; | |
866 | ||
867 | if (errno == EINTR) | |
868 | continue; | |
869 | ||
870 | if (errno != EAGAIN) | |
871 | return -errno; | |
872 | ||
873 | r = fd_wait_for_event(fd, POLLOUT, SEND_TIMEOUT_USEC); | |
874 | if (r < 0) | |
875 | return r; | |
876 | if (r == 0) | |
877 | return -ETIMEDOUT; | |
878 | } | |
879 | } | |
880 | ||
881 | static int write_loop(int fd, void *message, size_t length) { | |
882 | int r; | |
883 | ||
884 | assert(fd >= 0); | |
885 | assert(message); | |
886 | ||
887 | for (;;) { | |
888 | if (write(fd, message, length) >= 0) | |
889 | return 0; | |
890 | ||
891 | if (errno == EINTR) | |
892 | continue; | |
893 | ||
894 | if (errno != EAGAIN) | |
895 | return -errno; | |
896 | ||
897 | r = fd_wait_for_event(fd, POLLOUT, SEND_TIMEOUT_USEC); | |
898 | if (r < 0) | |
899 | return r; | |
900 | if (r == 0) | |
901 | return -ETIMEDOUT; | |
902 | } | |
903 | } | |
904 | ||
905 | int manager_write(Manager *m, int fd, DnsPacket *p) { | |
906 | int r; | |
907 | ||
908 | log_debug("Sending %s packet with id %" PRIu16 ".", DNS_PACKET_QR(p) ? "response" : "query", DNS_PACKET_ID(p)); | |
909 | ||
910 | r = write_loop(fd, DNS_PACKET_DATA(p), p->size); | |
911 | if (r < 0) | |
912 | return r; | |
913 | ||
914 | return 0; | |
915 | } | |
916 | ||
917 | static int manager_ipv4_send( | |
918 | Manager *m, | |
919 | int fd, | |
920 | int ifindex, | |
921 | const struct in_addr *destination, | |
922 | uint16_t port, | |
923 | const struct in_addr *source, | |
924 | DnsPacket *p) { | |
925 | union { | |
926 | struct cmsghdr header; /* For alignment */ | |
927 | uint8_t buffer[CMSG_SPACE(sizeof(struct in_pktinfo))]; | |
928 | } control = {}; | |
929 | union sockaddr_union sa; | |
930 | struct iovec iov; | |
931 | struct msghdr mh = { | |
932 | .msg_iov = &iov, | |
933 | .msg_iovlen = 1, | |
934 | .msg_name = &sa.sa, | |
935 | .msg_namelen = sizeof(sa.in), | |
936 | }; | |
937 | ||
938 | assert(m); | |
939 | assert(fd >= 0); | |
940 | assert(destination); | |
941 | assert(port > 0); | |
942 | assert(p); | |
943 | ||
944 | iov = IOVEC_MAKE(DNS_PACKET_DATA(p), p->size); | |
945 | ||
946 | sa = (union sockaddr_union) { | |
947 | .in.sin_family = AF_INET, | |
948 | .in.sin_addr = *destination, | |
949 | .in.sin_port = htobe16(port), | |
950 | }; | |
951 | ||
952 | if (ifindex > 0) { | |
953 | struct cmsghdr *cmsg; | |
954 | struct in_pktinfo *pi; | |
955 | ||
956 | mh.msg_control = &control; | |
957 | mh.msg_controllen = CMSG_LEN(sizeof(struct in_pktinfo)); | |
958 | ||
959 | cmsg = CMSG_FIRSTHDR(&mh); | |
960 | cmsg->cmsg_len = mh.msg_controllen; | |
961 | cmsg->cmsg_level = IPPROTO_IP; | |
962 | cmsg->cmsg_type = IP_PKTINFO; | |
963 | ||
964 | pi = (struct in_pktinfo*) CMSG_DATA(cmsg); | |
965 | pi->ipi_ifindex = ifindex; | |
966 | ||
967 | if (source) | |
968 | pi->ipi_spec_dst = *source; | |
969 | } | |
970 | ||
971 | return sendmsg_loop(fd, &mh, 0); | |
972 | } | |
973 | ||
974 | static int manager_ipv6_send( | |
975 | Manager *m, | |
976 | int fd, | |
977 | int ifindex, | |
978 | const struct in6_addr *destination, | |
979 | uint16_t port, | |
980 | const struct in6_addr *source, | |
981 | DnsPacket *p) { | |
982 | ||
983 | union { | |
984 | struct cmsghdr header; /* For alignment */ | |
985 | uint8_t buffer[CMSG_SPACE(sizeof(struct in6_pktinfo))]; | |
986 | } control = {}; | |
987 | union sockaddr_union sa; | |
988 | struct iovec iov; | |
989 | struct msghdr mh = { | |
990 | .msg_iov = &iov, | |
991 | .msg_iovlen = 1, | |
992 | .msg_name = &sa.sa, | |
993 | .msg_namelen = sizeof(sa.in6), | |
994 | }; | |
995 | ||
996 | assert(m); | |
997 | assert(fd >= 0); | |
998 | assert(destination); | |
999 | assert(port > 0); | |
1000 | assert(p); | |
1001 | ||
1002 | iov = IOVEC_MAKE(DNS_PACKET_DATA(p), p->size); | |
1003 | ||
1004 | sa = (union sockaddr_union) { | |
1005 | .in6.sin6_family = AF_INET6, | |
1006 | .in6.sin6_addr = *destination, | |
1007 | .in6.sin6_port = htobe16(port), | |
1008 | .in6.sin6_scope_id = ifindex, | |
1009 | }; | |
1010 | ||
1011 | if (ifindex > 0) { | |
1012 | struct cmsghdr *cmsg; | |
1013 | struct in6_pktinfo *pi; | |
1014 | ||
1015 | mh.msg_control = &control; | |
1016 | mh.msg_controllen = CMSG_LEN(sizeof(struct in6_pktinfo)); | |
1017 | ||
1018 | cmsg = CMSG_FIRSTHDR(&mh); | |
1019 | cmsg->cmsg_len = mh.msg_controllen; | |
1020 | cmsg->cmsg_level = IPPROTO_IPV6; | |
1021 | cmsg->cmsg_type = IPV6_PKTINFO; | |
1022 | ||
1023 | pi = (struct in6_pktinfo*) CMSG_DATA(cmsg); | |
1024 | pi->ipi6_ifindex = ifindex; | |
1025 | ||
1026 | if (source) | |
1027 | pi->ipi6_addr = *source; | |
1028 | } | |
1029 | ||
1030 | return sendmsg_loop(fd, &mh, 0); | |
1031 | } | |
1032 | ||
1033 | int manager_send( | |
1034 | Manager *m, | |
1035 | int fd, | |
1036 | int ifindex, | |
1037 | int family, | |
1038 | const union in_addr_union *destination, | |
1039 | uint16_t port, | |
1040 | const union in_addr_union *source, | |
1041 | DnsPacket *p) { | |
1042 | ||
1043 | assert(m); | |
1044 | assert(fd >= 0); | |
1045 | assert(destination); | |
1046 | assert(port > 0); | |
1047 | assert(p); | |
1048 | ||
1049 | 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)); | |
1050 | ||
1051 | if (family == AF_INET) | |
1052 | return manager_ipv4_send(m, fd, ifindex, &destination->in, port, source ? &source->in : NULL, p); | |
1053 | if (family == AF_INET6) | |
1054 | return manager_ipv6_send(m, fd, ifindex, &destination->in6, port, source ? &source->in6 : NULL, p); | |
1055 | ||
1056 | return -EAFNOSUPPORT; | |
1057 | } | |
1058 | ||
1059 | uint32_t manager_find_mtu(Manager *m) { | |
1060 | uint32_t mtu = 0; | |
1061 | Link *l; | |
1062 | Iterator i; | |
1063 | ||
1064 | /* If we don't know on which link a DNS packet would be | |
1065 | * delivered, let's find the largest MTU that works on all | |
1066 | * interfaces we know of */ | |
1067 | ||
1068 | HASHMAP_FOREACH(l, m->links, i) { | |
1069 | if (l->mtu <= 0) | |
1070 | continue; | |
1071 | ||
1072 | if (mtu <= 0 || l->mtu < mtu) | |
1073 | mtu = l->mtu; | |
1074 | } | |
1075 | ||
1076 | return mtu; | |
1077 | } | |
1078 | ||
1079 | int manager_find_ifindex(Manager *m, int family, const union in_addr_union *in_addr) { | |
1080 | LinkAddress *a; | |
1081 | ||
1082 | assert(m); | |
1083 | ||
1084 | a = manager_find_link_address(m, family, in_addr); | |
1085 | if (a) | |
1086 | return a->link->ifindex; | |
1087 | ||
1088 | return 0; | |
1089 | } | |
1090 | ||
1091 | void manager_refresh_rrs(Manager *m) { | |
1092 | Iterator i; | |
1093 | Link *l; | |
1094 | DnssdService *s; | |
1095 | ||
1096 | assert(m); | |
1097 | ||
1098 | m->llmnr_host_ipv4_key = dns_resource_key_unref(m->llmnr_host_ipv4_key); | |
1099 | m->llmnr_host_ipv6_key = dns_resource_key_unref(m->llmnr_host_ipv6_key); | |
1100 | m->mdns_host_ipv4_key = dns_resource_key_unref(m->mdns_host_ipv4_key); | |
1101 | m->mdns_host_ipv6_key = dns_resource_key_unref(m->mdns_host_ipv6_key); | |
1102 | ||
1103 | if (m->mdns_support == RESOLVE_SUPPORT_YES) | |
1104 | HASHMAP_FOREACH(s, m->dnssd_services, i) | |
1105 | if (dnssd_update_rrs(s) < 0) | |
1106 | log_warning("Failed to refresh DNS-SD service '%s'", s->name); | |
1107 | ||
1108 | HASHMAP_FOREACH(l, m->links, i) { | |
1109 | link_add_rrs(l, true); | |
1110 | link_add_rrs(l, false); | |
1111 | } | |
1112 | } | |
1113 | ||
1114 | static int manager_next_random_name(const char *old, char **ret_new) { | |
1115 | const char *p; | |
1116 | uint64_t u, a; | |
1117 | char *n; | |
1118 | ||
1119 | p = strchr(old, 0); | |
1120 | assert(p); | |
1121 | ||
1122 | while (p > old) { | |
1123 | if (!strchr(DIGITS, p[-1])) | |
1124 | break; | |
1125 | ||
1126 | p--; | |
1127 | } | |
1128 | ||
1129 | if (*p == 0 || safe_atou64(p, &u) < 0 || u <= 0) | |
1130 | u = 1; | |
1131 | ||
1132 | /* Add a random number to the old value. This way we can avoid | |
1133 | * that two hosts pick the same hostname, win on IPv4 and lose | |
1134 | * on IPv6 (or vice versa), and pick the same hostname | |
1135 | * replacement hostname, ad infinitum. We still want the | |
1136 | * numbers to go up monotonically, hence we just add a random | |
1137 | * value 1..10 */ | |
1138 | ||
1139 | random_bytes(&a, sizeof(a)); | |
1140 | u += 1 + a % 10; | |
1141 | ||
1142 | if (asprintf(&n, "%.*s%" PRIu64, (int) (p - old), old, u) < 0) | |
1143 | return -ENOMEM; | |
1144 | ||
1145 | *ret_new = n; | |
1146 | ||
1147 | return 0; | |
1148 | } | |
1149 | ||
1150 | int manager_next_hostname(Manager *m) { | |
1151 | _cleanup_free_ char *h = NULL, *k = NULL; | |
1152 | int r; | |
1153 | ||
1154 | assert(m); | |
1155 | ||
1156 | r = manager_next_random_name(m->llmnr_hostname, &h); | |
1157 | if (r < 0) | |
1158 | return r; | |
1159 | ||
1160 | r = dns_name_concat(h, "local", 0, &k); | |
1161 | if (r < 0) | |
1162 | return r; | |
1163 | ||
1164 | log_info("Hostname conflict, changing published hostname from '%s' to '%s'.", m->llmnr_hostname, h); | |
1165 | ||
1166 | free_and_replace(m->llmnr_hostname, h); | |
1167 | free_and_replace(m->mdns_hostname, k); | |
1168 | ||
1169 | manager_refresh_rrs(m); | |
1170 | ||
1171 | return 0; | |
1172 | } | |
1173 | ||
1174 | LinkAddress* manager_find_link_address(Manager *m, int family, const union in_addr_union *in_addr) { | |
1175 | Iterator i; | |
1176 | Link *l; | |
1177 | ||
1178 | assert(m); | |
1179 | ||
1180 | HASHMAP_FOREACH(l, m->links, i) { | |
1181 | LinkAddress *a; | |
1182 | ||
1183 | a = link_find_address(l, family, in_addr); | |
1184 | if (a) | |
1185 | return a; | |
1186 | } | |
1187 | ||
1188 | return NULL; | |
1189 | } | |
1190 | ||
1191 | bool manager_our_packet(Manager *m, DnsPacket *p) { | |
1192 | assert(m); | |
1193 | assert(p); | |
1194 | ||
1195 | return !!manager_find_link_address(m, p->family, &p->sender); | |
1196 | } | |
1197 | ||
1198 | DnsScope* manager_find_scope(Manager *m, DnsPacket *p) { | |
1199 | Link *l; | |
1200 | ||
1201 | assert(m); | |
1202 | assert(p); | |
1203 | ||
1204 | l = hashmap_get(m->links, INT_TO_PTR(p->ifindex)); | |
1205 | if (!l) | |
1206 | return NULL; | |
1207 | ||
1208 | switch (p->protocol) { | |
1209 | case DNS_PROTOCOL_LLMNR: | |
1210 | if (p->family == AF_INET) | |
1211 | return l->llmnr_ipv4_scope; | |
1212 | else if (p->family == AF_INET6) | |
1213 | return l->llmnr_ipv6_scope; | |
1214 | ||
1215 | break; | |
1216 | ||
1217 | case DNS_PROTOCOL_MDNS: | |
1218 | if (p->family == AF_INET) | |
1219 | return l->mdns_ipv4_scope; | |
1220 | else if (p->family == AF_INET6) | |
1221 | return l->mdns_ipv6_scope; | |
1222 | ||
1223 | break; | |
1224 | ||
1225 | default: | |
1226 | break; | |
1227 | } | |
1228 | ||
1229 | return NULL; | |
1230 | } | |
1231 | ||
1232 | void manager_verify_all(Manager *m) { | |
1233 | DnsScope *s; | |
1234 | ||
1235 | assert(m); | |
1236 | ||
1237 | LIST_FOREACH(scopes, s, m->dns_scopes) | |
1238 | dns_zone_verify_all(&s->zone); | |
1239 | } | |
1240 | ||
1241 | int manager_is_own_hostname(Manager *m, const char *name) { | |
1242 | int r; | |
1243 | ||
1244 | assert(m); | |
1245 | assert(name); | |
1246 | ||
1247 | if (m->llmnr_hostname) { | |
1248 | r = dns_name_equal(name, m->llmnr_hostname); | |
1249 | if (r != 0) | |
1250 | return r; | |
1251 | } | |
1252 | ||
1253 | if (m->mdns_hostname) { | |
1254 | r = dns_name_equal(name, m->mdns_hostname); | |
1255 | if (r != 0) | |
1256 | return r; | |
1257 | } | |
1258 | ||
1259 | if (m->full_hostname) | |
1260 | return dns_name_equal(name, m->full_hostname); | |
1261 | ||
1262 | return 0; | |
1263 | } | |
1264 | ||
1265 | int manager_compile_dns_servers(Manager *m, OrderedSet **dns) { | |
1266 | DnsServer *s; | |
1267 | Iterator i; | |
1268 | Link *l; | |
1269 | int r; | |
1270 | ||
1271 | assert(m); | |
1272 | assert(dns); | |
1273 | ||
1274 | r = ordered_set_ensure_allocated(dns, &dns_server_hash_ops); | |
1275 | if (r < 0) | |
1276 | return r; | |
1277 | ||
1278 | /* First add the system-wide servers and domains */ | |
1279 | LIST_FOREACH(servers, s, m->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 | /* Then, add the per-link servers */ | |
1288 | HASHMAP_FOREACH(l, m->links, i) { | |
1289 | LIST_FOREACH(servers, s, l->dns_servers) { | |
1290 | r = ordered_set_put(*dns, s); | |
1291 | if (r == -EEXIST) | |
1292 | continue; | |
1293 | if (r < 0) | |
1294 | return r; | |
1295 | } | |
1296 | } | |
1297 | ||
1298 | /* If we found nothing, add the fallback servers */ | |
1299 | if (ordered_set_isempty(*dns)) { | |
1300 | LIST_FOREACH(servers, s, m->fallback_dns_servers) { | |
1301 | r = ordered_set_put(*dns, s); | |
1302 | if (r == -EEXIST) | |
1303 | continue; | |
1304 | if (r < 0) | |
1305 | return r; | |
1306 | } | |
1307 | } | |
1308 | ||
1309 | return 0; | |
1310 | } | |
1311 | ||
1312 | /* filter_route is a tri-state: | |
1313 | * < 0: no filtering | |
1314 | * = 0 or false: return only domains which should be used for searching | |
1315 | * > 0 or true: return only domains which are for routing only | |
1316 | */ | |
1317 | int manager_compile_search_domains(Manager *m, OrderedSet **domains, int filter_route) { | |
1318 | DnsSearchDomain *d; | |
1319 | Iterator i; | |
1320 | Link *l; | |
1321 | int r; | |
1322 | ||
1323 | assert(m); | |
1324 | assert(domains); | |
1325 | ||
1326 | r = ordered_set_ensure_allocated(domains, &dns_name_hash_ops); | |
1327 | if (r < 0) | |
1328 | return r; | |
1329 | ||
1330 | LIST_FOREACH(domains, d, m->search_domains) { | |
1331 | ||
1332 | if (filter_route >= 0 && | |
1333 | d->route_only != !!filter_route) | |
1334 | continue; | |
1335 | ||
1336 | r = ordered_set_put(*domains, d->name); | |
1337 | if (r == -EEXIST) | |
1338 | continue; | |
1339 | if (r < 0) | |
1340 | return r; | |
1341 | } | |
1342 | ||
1343 | HASHMAP_FOREACH(l, m->links, i) { | |
1344 | ||
1345 | LIST_FOREACH(domains, d, l->search_domains) { | |
1346 | ||
1347 | if (filter_route >= 0 && | |
1348 | d->route_only != !!filter_route) | |
1349 | continue; | |
1350 | ||
1351 | r = ordered_set_put(*domains, d->name); | |
1352 | if (r == -EEXIST) | |
1353 | continue; | |
1354 | if (r < 0) | |
1355 | return r; | |
1356 | } | |
1357 | } | |
1358 | ||
1359 | return 0; | |
1360 | } | |
1361 | ||
1362 | DnssecMode manager_get_dnssec_mode(Manager *m) { | |
1363 | assert(m); | |
1364 | ||
1365 | if (m->dnssec_mode != _DNSSEC_MODE_INVALID) | |
1366 | return m->dnssec_mode; | |
1367 | ||
1368 | return DNSSEC_NO; | |
1369 | } | |
1370 | ||
1371 | bool manager_dnssec_supported(Manager *m) { | |
1372 | DnsServer *server; | |
1373 | Iterator i; | |
1374 | Link *l; | |
1375 | ||
1376 | assert(m); | |
1377 | ||
1378 | if (manager_get_dnssec_mode(m) == DNSSEC_NO) | |
1379 | return false; | |
1380 | ||
1381 | server = manager_get_dns_server(m); | |
1382 | if (server && !dns_server_dnssec_supported(server)) | |
1383 | return false; | |
1384 | ||
1385 | HASHMAP_FOREACH(l, m->links, i) | |
1386 | if (!link_dnssec_supported(l)) | |
1387 | return false; | |
1388 | ||
1389 | return true; | |
1390 | } | |
1391 | ||
1392 | DnsOverTlsMode manager_get_dns_over_tls_mode(Manager *m) { | |
1393 | assert(m); | |
1394 | ||
1395 | if (m->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID) | |
1396 | return m->dns_over_tls_mode; | |
1397 | ||
1398 | return DNS_OVER_TLS_NO; | |
1399 | } | |
1400 | ||
1401 | void manager_dnssec_verdict(Manager *m, DnssecVerdict verdict, const DnsResourceKey *key) { | |
1402 | ||
1403 | assert(verdict >= 0); | |
1404 | assert(verdict < _DNSSEC_VERDICT_MAX); | |
1405 | ||
1406 | if (DEBUG_LOGGING) { | |
1407 | char s[DNS_RESOURCE_KEY_STRING_MAX]; | |
1408 | ||
1409 | log_debug("Found verdict for lookup %s: %s", | |
1410 | dns_resource_key_to_string(key, s, sizeof s), | |
1411 | dnssec_verdict_to_string(verdict)); | |
1412 | } | |
1413 | ||
1414 | m->n_dnssec_verdict[verdict]++; | |
1415 | } | |
1416 | ||
1417 | bool manager_routable(Manager *m, int family) { | |
1418 | Iterator i; | |
1419 | Link *l; | |
1420 | ||
1421 | assert(m); | |
1422 | ||
1423 | /* Returns true if the host has at least one interface with a routable address of the specified type */ | |
1424 | ||
1425 | HASHMAP_FOREACH(l, m->links, i) | |
1426 | if (link_relevant(l, family, false)) | |
1427 | return true; | |
1428 | ||
1429 | return false; | |
1430 | } | |
1431 | ||
1432 | void manager_flush_caches(Manager *m) { | |
1433 | DnsScope *scope; | |
1434 | ||
1435 | assert(m); | |
1436 | ||
1437 | LIST_FOREACH(scopes, scope, m->dns_scopes) | |
1438 | dns_cache_flush(&scope->cache); | |
1439 | ||
1440 | log_info("Flushed all caches."); | |
1441 | } | |
1442 | ||
1443 | void manager_reset_server_features(Manager *m) { | |
1444 | Iterator i; | |
1445 | Link *l; | |
1446 | ||
1447 | dns_server_reset_features_all(m->dns_servers); | |
1448 | dns_server_reset_features_all(m->fallback_dns_servers); | |
1449 | ||
1450 | HASHMAP_FOREACH(l, m->links, i) | |
1451 | dns_server_reset_features_all(l->dns_servers); | |
1452 | ||
1453 | log_info("Resetting learnt feature levels on all servers."); | |
1454 | } | |
1455 | ||
1456 | void manager_cleanup_saved_user(Manager *m) { | |
1457 | _cleanup_closedir_ DIR *d = NULL; | |
1458 | struct dirent *de; | |
1459 | int r; | |
1460 | ||
1461 | assert(m); | |
1462 | ||
1463 | /* Clean up all saved per-link files in /run/systemd/resolve/netif/ that don't have a matching interface | |
1464 | * anymore. These files are created to persist settings pushed in by the user via the bus, so that resolved can | |
1465 | * be restarted without losing this data. */ | |
1466 | ||
1467 | d = opendir("/run/systemd/resolve/netif/"); | |
1468 | if (!d) { | |
1469 | if (errno == ENOENT) | |
1470 | return; | |
1471 | ||
1472 | log_warning_errno(errno, "Failed to open interface directory: %m"); | |
1473 | return; | |
1474 | } | |
1475 | ||
1476 | FOREACH_DIRENT_ALL(de, d, log_error_errno(errno, "Failed to read interface directory: %m")) { | |
1477 | _cleanup_free_ char *p = NULL; | |
1478 | int ifindex; | |
1479 | Link *l; | |
1480 | ||
1481 | if (!IN_SET(de->d_type, DT_UNKNOWN, DT_REG)) | |
1482 | continue; | |
1483 | ||
1484 | if (dot_or_dot_dot(de->d_name)) | |
1485 | continue; | |
1486 | ||
1487 | r = parse_ifindex(de->d_name, &ifindex); | |
1488 | if (r < 0) /* Probably some temporary file from a previous run. Delete it */ | |
1489 | goto rm; | |
1490 | ||
1491 | l = hashmap_get(m->links, INT_TO_PTR(ifindex)); | |
1492 | if (!l) /* link vanished */ | |
1493 | goto rm; | |
1494 | ||
1495 | if (l->is_managed) /* now managed by networkd, hence the bus settings are useless */ | |
1496 | goto rm; | |
1497 | ||
1498 | continue; | |
1499 | ||
1500 | rm: | |
1501 | p = strappend("/run/systemd/resolve/netif/", de->d_name); | |
1502 | if (!p) { | |
1503 | log_oom(); | |
1504 | return; | |
1505 | } | |
1506 | ||
1507 | (void) unlink(p); | |
1508 | } | |
1509 | } | |
1510 | ||
1511 | bool manager_next_dnssd_names(Manager *m) { | |
1512 | Iterator i; | |
1513 | DnssdService *s; | |
1514 | bool tried = false; | |
1515 | int r; | |
1516 | ||
1517 | assert(m); | |
1518 | ||
1519 | HASHMAP_FOREACH(s, m->dnssd_services, i) { | |
1520 | _cleanup_free_ char * new_name = NULL; | |
1521 | ||
1522 | if (!s->withdrawn) | |
1523 | continue; | |
1524 | ||
1525 | r = manager_next_random_name(s->name_template, &new_name); | |
1526 | if (r < 0) { | |
1527 | log_warning_errno(r, "Failed to get new name for service '%s': %m", s->name); | |
1528 | continue; | |
1529 | } | |
1530 | ||
1531 | free_and_replace(s->name_template, new_name); | |
1532 | ||
1533 | s->withdrawn = false; | |
1534 | ||
1535 | tried = true; | |
1536 | } | |
1537 | ||
1538 | if (tried) | |
1539 | manager_refresh_rrs(m); | |
1540 | ||
1541 | return tried; | |
1542 | } |