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1 | /*** | |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright 2014 Tom Gundersen <teg@jklm.no> | |
5 | ||
6 | systemd is free software; you can redistribute it and/or modify it | |
7 | under the terms of the GNU Lesser General Public License as published by | |
8 | the Free Software Foundation; either version 2.1 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | systemd is distributed in the hope that it will be useful, but | |
12 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public License | |
17 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
18 | ***/ | |
19 | ||
20 | #include <netinet/in.h> | |
21 | #include <poll.h> | |
22 | #include <sys/ioctl.h> | |
23 | ||
24 | #include "af-list.h" | |
25 | #include "alloc-util.h" | |
26 | #include "dirent-util.h" | |
27 | #include "dns-domain.h" | |
28 | #include "fd-util.h" | |
29 | #include "fileio-label.h" | |
30 | #include "hostname-util.h" | |
31 | #include "io-util.h" | |
32 | #include "netlink-util.h" | |
33 | #include "network-internal.h" | |
34 | #include "ordered-set.h" | |
35 | #include "parse-util.h" | |
36 | #include "random-util.h" | |
37 | #include "resolved-bus.h" | |
38 | #include "resolved-conf.h" | |
39 | #include "resolved-dns-stub.h" | |
40 | #include "resolved-etc-hosts.h" | |
41 | #include "resolved-llmnr.h" | |
42 | #include "resolved-manager.h" | |
43 | #include "resolved-mdns.h" | |
44 | #include "resolved-resolv-conf.h" | |
45 | #include "socket-util.h" | |
46 | #include "string-table.h" | |
47 | #include "string-util.h" | |
48 | #include "utf8.h" | |
49 | ||
50 | #define SEND_TIMEOUT_USEC (200 * USEC_PER_MSEC) | |
51 | ||
52 | static int manager_process_link(sd_netlink *rtnl, sd_netlink_message *mm, void *userdata) { | |
53 | Manager *m = userdata; | |
54 | uint16_t type; | |
55 | Link *l; | |
56 | int ifindex, r; | |
57 | ||
58 | assert(rtnl); | |
59 | assert(m); | |
60 | assert(mm); | |
61 | ||
62 | r = sd_netlink_message_get_type(mm, &type); | |
63 | if (r < 0) | |
64 | goto fail; | |
65 | ||
66 | r = sd_rtnl_message_link_get_ifindex(mm, &ifindex); | |
67 | if (r < 0) | |
68 | goto fail; | |
69 | ||
70 | l = hashmap_get(m->links, INT_TO_PTR(ifindex)); | |
71 | ||
72 | switch (type) { | |
73 | ||
74 | case RTM_NEWLINK:{ | |
75 | bool is_new = !l; | |
76 | ||
77 | if (!l) { | |
78 | r = link_new(m, &l, ifindex); | |
79 | if (r < 0) | |
80 | goto fail; | |
81 | } | |
82 | ||
83 | r = link_process_rtnl(l, mm); | |
84 | if (r < 0) | |
85 | goto fail; | |
86 | ||
87 | r = link_update(l); | |
88 | if (r < 0) | |
89 | goto fail; | |
90 | ||
91 | if (is_new) | |
92 | log_debug("Found new link %i/%s", ifindex, l->name); | |
93 | ||
94 | break; | |
95 | } | |
96 | ||
97 | case RTM_DELLINK: | |
98 | if (l) { | |
99 | log_debug("Removing link %i/%s", l->ifindex, l->name); | |
100 | link_remove_user(l); | |
101 | link_free(l); | |
102 | } | |
103 | ||
104 | break; | |
105 | } | |
106 | ||
107 | return 0; | |
108 | ||
109 | fail: | |
110 | log_warning_errno(r, "Failed to process RTNL link message: %m"); | |
111 | return 0; | |
112 | } | |
113 | ||
114 | static int manager_process_address(sd_netlink *rtnl, sd_netlink_message *mm, void *userdata) { | |
115 | Manager *m = userdata; | |
116 | union in_addr_union address; | |
117 | uint16_t type; | |
118 | int r, ifindex, family; | |
119 | LinkAddress *a; | |
120 | Link *l; | |
121 | ||
122 | assert(rtnl); | |
123 | assert(mm); | |
124 | assert(m); | |
125 | ||
126 | r = sd_netlink_message_get_type(mm, &type); | |
127 | if (r < 0) | |
128 | goto fail; | |
129 | ||
130 | r = sd_rtnl_message_addr_get_ifindex(mm, &ifindex); | |
131 | if (r < 0) | |
132 | goto fail; | |
133 | ||
134 | l = hashmap_get(m->links, INT_TO_PTR(ifindex)); | |
135 | if (!l) | |
136 | return 0; | |
137 | ||
138 | r = sd_rtnl_message_addr_get_family(mm, &family); | |
139 | if (r < 0) | |
140 | goto fail; | |
141 | ||
142 | switch (family) { | |
143 | ||
144 | case AF_INET: | |
145 | r = sd_netlink_message_read_in_addr(mm, IFA_LOCAL, &address.in); | |
146 | if (r < 0) { | |
147 | r = sd_netlink_message_read_in_addr(mm, IFA_ADDRESS, &address.in); | |
148 | if (r < 0) | |
149 | goto fail; | |
150 | } | |
151 | ||
152 | break; | |
153 | ||
154 | case AF_INET6: | |
155 | r = sd_netlink_message_read_in6_addr(mm, IFA_LOCAL, &address.in6); | |
156 | if (r < 0) { | |
157 | r = sd_netlink_message_read_in6_addr(mm, IFA_ADDRESS, &address.in6); | |
158 | if (r < 0) | |
159 | goto fail; | |
160 | } | |
161 | ||
162 | break; | |
163 | ||
164 | default: | |
165 | return 0; | |
166 | } | |
167 | ||
168 | a = link_find_address(l, family, &address); | |
169 | ||
170 | switch (type) { | |
171 | ||
172 | case RTM_NEWADDR: | |
173 | ||
174 | if (!a) { | |
175 | r = link_address_new(l, &a, family, &address); | |
176 | if (r < 0) | |
177 | return r; | |
178 | } | |
179 | ||
180 | r = link_address_update_rtnl(a, mm); | |
181 | if (r < 0) | |
182 | return r; | |
183 | ||
184 | break; | |
185 | ||
186 | case RTM_DELADDR: | |
187 | link_address_free(a); | |
188 | break; | |
189 | } | |
190 | ||
191 | return 0; | |
192 | ||
193 | fail: | |
194 | log_warning_errno(r, "Failed to process RTNL address message: %m"); | |
195 | return 0; | |
196 | } | |
197 | ||
198 | static int manager_rtnl_listen(Manager *m) { | |
199 | _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL; | |
200 | sd_netlink_message *i; | |
201 | int r; | |
202 | ||
203 | assert(m); | |
204 | ||
205 | /* First, subscribe to interfaces coming and going */ | |
206 | r = sd_netlink_open(&m->rtnl); | |
207 | if (r < 0) | |
208 | return r; | |
209 | ||
210 | r = sd_netlink_attach_event(m->rtnl, m->event, SD_EVENT_PRIORITY_IMPORTANT); | |
211 | if (r < 0) | |
212 | return r; | |
213 | ||
214 | r = sd_netlink_add_match(m->rtnl, RTM_NEWLINK, manager_process_link, m); | |
215 | if (r < 0) | |
216 | return r; | |
217 | ||
218 | r = sd_netlink_add_match(m->rtnl, RTM_DELLINK, manager_process_link, m); | |
219 | if (r < 0) | |
220 | return r; | |
221 | ||
222 | r = sd_netlink_add_match(m->rtnl, RTM_NEWADDR, manager_process_address, m); | |
223 | if (r < 0) | |
224 | return r; | |
225 | ||
226 | r = sd_netlink_add_match(m->rtnl, RTM_DELADDR, manager_process_address, m); | |
227 | if (r < 0) | |
228 | return r; | |
229 | ||
230 | /* Then, enumerate all links */ | |
231 | r = sd_rtnl_message_new_link(m->rtnl, &req, RTM_GETLINK, 0); | |
232 | if (r < 0) | |
233 | return r; | |
234 | ||
235 | r = sd_netlink_message_request_dump(req, true); | |
236 | if (r < 0) | |
237 | return r; | |
238 | ||
239 | r = sd_netlink_call(m->rtnl, req, 0, &reply); | |
240 | if (r < 0) | |
241 | return r; | |
242 | ||
243 | for (i = reply; i; i = sd_netlink_message_next(i)) { | |
244 | r = manager_process_link(m->rtnl, i, m); | |
245 | if (r < 0) | |
246 | return r; | |
247 | } | |
248 | ||
249 | req = sd_netlink_message_unref(req); | |
250 | reply = sd_netlink_message_unref(reply); | |
251 | ||
252 | /* Finally, enumerate all addresses, too */ | |
253 | r = sd_rtnl_message_new_addr(m->rtnl, &req, RTM_GETADDR, 0, AF_UNSPEC); | |
254 | if (r < 0) | |
255 | return r; | |
256 | ||
257 | r = sd_netlink_message_request_dump(req, true); | |
258 | if (r < 0) | |
259 | return r; | |
260 | ||
261 | r = sd_netlink_call(m->rtnl, req, 0, &reply); | |
262 | if (r < 0) | |
263 | return r; | |
264 | ||
265 | for (i = reply; i; i = sd_netlink_message_next(i)) { | |
266 | r = manager_process_address(m->rtnl, i, m); | |
267 | if (r < 0) | |
268 | return r; | |
269 | } | |
270 | ||
271 | return r; | |
272 | } | |
273 | ||
274 | static int on_network_event(sd_event_source *s, int fd, uint32_t revents, void *userdata) { | |
275 | Manager *m = userdata; | |
276 | Iterator i; | |
277 | Link *l; | |
278 | int r; | |
279 | ||
280 | assert(m); | |
281 | ||
282 | sd_network_monitor_flush(m->network_monitor); | |
283 | ||
284 | HASHMAP_FOREACH(l, m->links, i) { | |
285 | r = link_update(l); | |
286 | if (r < 0) | |
287 | log_warning_errno(r, "Failed to update monitor information for %i: %m", l->ifindex); | |
288 | } | |
289 | ||
290 | (void) manager_write_resolv_conf(m); | |
291 | ||
292 | return 0; | |
293 | } | |
294 | ||
295 | static int manager_network_monitor_listen(Manager *m) { | |
296 | int r, fd, events; | |
297 | ||
298 | assert(m); | |
299 | ||
300 | r = sd_network_monitor_new(&m->network_monitor, NULL); | |
301 | if (r < 0) | |
302 | return r; | |
303 | ||
304 | fd = sd_network_monitor_get_fd(m->network_monitor); | |
305 | if (fd < 0) | |
306 | return fd; | |
307 | ||
308 | events = sd_network_monitor_get_events(m->network_monitor); | |
309 | if (events < 0) | |
310 | return events; | |
311 | ||
312 | r = sd_event_add_io(m->event, &m->network_event_source, fd, events, &on_network_event, m); | |
313 | if (r < 0) | |
314 | return r; | |
315 | ||
316 | r = sd_event_source_set_priority(m->network_event_source, SD_EVENT_PRIORITY_IMPORTANT+5); | |
317 | if (r < 0) | |
318 | return r; | |
319 | ||
320 | (void) sd_event_source_set_description(m->network_event_source, "network-monitor"); | |
321 | ||
322 | return 0; | |
323 | } | |
324 | ||
325 | static int determine_hostname(char **llmnr_hostname, char **mdns_hostname) { | |
326 | _cleanup_free_ char *h = NULL, *n = NULL; | |
327 | char label[DNS_LABEL_MAX]; | |
328 | const char *p; | |
329 | int r, k; | |
330 | ||
331 | assert(llmnr_hostname); | |
332 | assert(mdns_hostname); | |
333 | ||
334 | /* Extract and normalize the first label of the locally | |
335 | * configured hostname, and check it's not "localhost". */ | |
336 | ||
337 | h = gethostname_malloc(); | |
338 | if (!h) | |
339 | return log_oom(); | |
340 | ||
341 | p = h; | |
342 | r = dns_label_unescape(&p, label, sizeof(label)); | |
343 | if (r < 0) | |
344 | return log_error_errno(r, "Failed to unescape host name: %m"); | |
345 | if (r == 0) { | |
346 | log_error("Couldn't find a single label in hosntame."); | |
347 | return -EINVAL; | |
348 | } | |
349 | ||
350 | k = dns_label_undo_idna(label, r, label, sizeof(label)); | |
351 | if (k < 0) | |
352 | return log_error_errno(k, "Failed to undo IDNA: %m"); | |
353 | if (k > 0) | |
354 | r = k; | |
355 | ||
356 | if (!utf8_is_valid(label)) { | |
357 | log_error("System hostname is not UTF-8 clean."); | |
358 | return -EINVAL; | |
359 | } | |
360 | ||
361 | r = dns_label_escape_new(label, r, &n); | |
362 | if (r < 0) | |
363 | return log_error_errno(r, "Failed to escape host name: %m"); | |
364 | ||
365 | if (is_localhost(n)) { | |
366 | log_debug("System hostname is 'localhost', ignoring."); | |
367 | return -EINVAL; | |
368 | } | |
369 | ||
370 | r = dns_name_concat(n, "local", mdns_hostname); | |
371 | if (r < 0) | |
372 | return log_error_errno(r, "Failed to determine mDNS hostname: %m"); | |
373 | ||
374 | *llmnr_hostname = n; | |
375 | n = NULL; | |
376 | ||
377 | return 0; | |
378 | } | |
379 | ||
380 | static int on_hostname_change(sd_event_source *es, int fd, uint32_t revents, void *userdata) { | |
381 | _cleanup_free_ char *llmnr_hostname = NULL, *mdns_hostname = NULL; | |
382 | Manager *m = userdata; | |
383 | int r; | |
384 | ||
385 | assert(m); | |
386 | ||
387 | r = determine_hostname(&llmnr_hostname, &mdns_hostname); | |
388 | if (r < 0) | |
389 | return 0; /* ignore invalid hostnames */ | |
390 | ||
391 | if (streq(llmnr_hostname, m->llmnr_hostname) && streq(mdns_hostname, m->mdns_hostname)) | |
392 | return 0; | |
393 | ||
394 | log_info("System hostname changed to '%s'.", llmnr_hostname); | |
395 | ||
396 | free(m->llmnr_hostname); | |
397 | free(m->mdns_hostname); | |
398 | ||
399 | m->llmnr_hostname = llmnr_hostname; | |
400 | m->mdns_hostname = mdns_hostname; | |
401 | ||
402 | llmnr_hostname = mdns_hostname = NULL; | |
403 | ||
404 | manager_refresh_rrs(m); | |
405 | ||
406 | return 0; | |
407 | } | |
408 | ||
409 | static int manager_watch_hostname(Manager *m) { | |
410 | int r; | |
411 | ||
412 | assert(m); | |
413 | ||
414 | m->hostname_fd = open("/proc/sys/kernel/hostname", O_RDONLY|O_CLOEXEC|O_NDELAY|O_NOCTTY); | |
415 | if (m->hostname_fd < 0) { | |
416 | log_warning_errno(errno, "Failed to watch hostname: %m"); | |
417 | return 0; | |
418 | } | |
419 | ||
420 | r = sd_event_add_io(m->event, &m->hostname_event_source, m->hostname_fd, 0, on_hostname_change, m); | |
421 | if (r < 0) { | |
422 | if (r == -EPERM) | |
423 | /* kernels prior to 3.2 don't support polling this file. Ignore the failure. */ | |
424 | m->hostname_fd = safe_close(m->hostname_fd); | |
425 | else | |
426 | return log_error_errno(r, "Failed to add hostname event source: %m"); | |
427 | } | |
428 | ||
429 | (void) sd_event_source_set_description(m->hostname_event_source, "hostname"); | |
430 | ||
431 | r = determine_hostname(&m->llmnr_hostname, &m->mdns_hostname); | |
432 | if (r < 0) { | |
433 | log_info("Defaulting to hostname 'linux'."); | |
434 | m->llmnr_hostname = strdup("linux"); | |
435 | if (!m->llmnr_hostname) | |
436 | return log_oom(); | |
437 | ||
438 | m->mdns_hostname = strdup("linux.local"); | |
439 | if (!m->mdns_hostname) | |
440 | return log_oom(); | |
441 | } else | |
442 | log_info("Using system hostname '%s'.", m->llmnr_hostname); | |
443 | ||
444 | return 0; | |
445 | } | |
446 | ||
447 | static int manager_sigusr1(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { | |
448 | _cleanup_free_ char *buffer = NULL; | |
449 | _cleanup_fclose_ FILE *f = NULL; | |
450 | Manager *m = userdata; | |
451 | size_t size = 0; | |
452 | DnsScope *scope; | |
453 | ||
454 | assert(s); | |
455 | assert(si); | |
456 | assert(m); | |
457 | ||
458 | f = open_memstream(&buffer, &size); | |
459 | if (!f) | |
460 | return log_oom(); | |
461 | ||
462 | LIST_FOREACH(scopes, scope, m->dns_scopes) | |
463 | dns_scope_dump(scope, f); | |
464 | ||
465 | if (fflush_and_check(f) < 0) | |
466 | return log_oom(); | |
467 | ||
468 | log_dump(LOG_INFO, buffer); | |
469 | return 0; | |
470 | } | |
471 | ||
472 | static int manager_sigusr2(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { | |
473 | Manager *m = userdata; | |
474 | ||
475 | assert(s); | |
476 | assert(si); | |
477 | assert(m); | |
478 | ||
479 | manager_flush_caches(m); | |
480 | ||
481 | return 0; | |
482 | } | |
483 | ||
484 | int manager_new(Manager **ret) { | |
485 | _cleanup_(manager_freep) Manager *m = NULL; | |
486 | int r; | |
487 | ||
488 | assert(ret); | |
489 | ||
490 | m = new0(Manager, 1); | |
491 | if (!m) | |
492 | return -ENOMEM; | |
493 | ||
494 | m->llmnr_ipv4_udp_fd = m->llmnr_ipv6_udp_fd = -1; | |
495 | m->llmnr_ipv4_tcp_fd = m->llmnr_ipv6_tcp_fd = -1; | |
496 | m->mdns_ipv4_fd = m->mdns_ipv6_fd = -1; | |
497 | m->dns_stub_udp_fd = m->dns_stub_tcp_fd = -1; | |
498 | m->hostname_fd = -1; | |
499 | ||
500 | m->llmnr_support = RESOLVE_SUPPORT_YES; | |
501 | m->mdns_support = RESOLVE_SUPPORT_NO; | |
502 | m->dnssec_mode = DEFAULT_DNSSEC_MODE; | |
503 | m->enable_cache = true; | |
504 | m->read_resolv_conf = true; | |
505 | m->need_builtin_fallbacks = true; | |
506 | m->etc_hosts_last = m->etc_hosts_mtime = USEC_INFINITY; | |
507 | ||
508 | r = dns_trust_anchor_load(&m->trust_anchor); | |
509 | if (r < 0) | |
510 | return r; | |
511 | ||
512 | r = manager_parse_config_file(m); | |
513 | if (r < 0) | |
514 | return r; | |
515 | ||
516 | r = sd_event_default(&m->event); | |
517 | if (r < 0) | |
518 | return r; | |
519 | ||
520 | sd_event_add_signal(m->event, NULL, SIGTERM, NULL, NULL); | |
521 | sd_event_add_signal(m->event, NULL, SIGINT, NULL, NULL); | |
522 | ||
523 | sd_event_set_watchdog(m->event, true); | |
524 | ||
525 | r = manager_watch_hostname(m); | |
526 | if (r < 0) | |
527 | return r; | |
528 | ||
529 | r = dns_scope_new(m, &m->unicast_scope, NULL, DNS_PROTOCOL_DNS, AF_UNSPEC); | |
530 | if (r < 0) | |
531 | return r; | |
532 | ||
533 | r = manager_network_monitor_listen(m); | |
534 | if (r < 0) | |
535 | return r; | |
536 | ||
537 | r = manager_rtnl_listen(m); | |
538 | if (r < 0) | |
539 | return r; | |
540 | ||
541 | r = manager_connect_bus(m); | |
542 | if (r < 0) | |
543 | return r; | |
544 | ||
545 | (void) sd_event_add_signal(m->event, &m->sigusr1_event_source, SIGUSR1, manager_sigusr1, m); | |
546 | (void) sd_event_add_signal(m->event, &m->sigusr2_event_source, SIGUSR2, manager_sigusr2, m); | |
547 | ||
548 | manager_cleanup_saved_user(m); | |
549 | ||
550 | *ret = m; | |
551 | m = NULL; | |
552 | ||
553 | return 0; | |
554 | } | |
555 | ||
556 | int manager_start(Manager *m) { | |
557 | int r; | |
558 | ||
559 | assert(m); | |
560 | ||
561 | r = manager_dns_stub_start(m); | |
562 | if (r < 0) | |
563 | return r; | |
564 | ||
565 | r = manager_llmnr_start(m); | |
566 | if (r < 0) | |
567 | return r; | |
568 | ||
569 | r = manager_mdns_start(m); | |
570 | if (r < 0) | |
571 | return r; | |
572 | ||
573 | return 0; | |
574 | } | |
575 | ||
576 | Manager *manager_free(Manager *m) { | |
577 | Link *l; | |
578 | ||
579 | if (!m) | |
580 | return NULL; | |
581 | ||
582 | dns_server_unlink_all(m->dns_servers); | |
583 | dns_server_unlink_all(m->fallback_dns_servers); | |
584 | dns_search_domain_unlink_all(m->search_domains); | |
585 | ||
586 | while ((l = hashmap_first(m->links))) | |
587 | link_free(l); | |
588 | ||
589 | while (m->dns_queries) | |
590 | dns_query_free(m->dns_queries); | |
591 | ||
592 | dns_scope_free(m->unicast_scope); | |
593 | ||
594 | /* At this point only orphaned streams should remain. All others should have been freed already by their | |
595 | * owners */ | |
596 | while (m->dns_streams) | |
597 | dns_stream_unref(m->dns_streams); | |
598 | ||
599 | hashmap_free(m->links); | |
600 | hashmap_free(m->dns_transactions); | |
601 | ||
602 | sd_event_source_unref(m->network_event_source); | |
603 | sd_network_monitor_unref(m->network_monitor); | |
604 | ||
605 | sd_netlink_unref(m->rtnl); | |
606 | sd_event_source_unref(m->rtnl_event_source); | |
607 | ||
608 | manager_llmnr_stop(m); | |
609 | manager_mdns_stop(m); | |
610 | manager_dns_stub_stop(m); | |
611 | ||
612 | sd_bus_slot_unref(m->prepare_for_sleep_slot); | |
613 | sd_event_source_unref(m->bus_retry_event_source); | |
614 | sd_bus_unref(m->bus); | |
615 | ||
616 | sd_event_source_unref(m->sigusr1_event_source); | |
617 | sd_event_source_unref(m->sigusr2_event_source); | |
618 | ||
619 | sd_event_unref(m->event); | |
620 | ||
621 | dns_resource_key_unref(m->llmnr_host_ipv4_key); | |
622 | dns_resource_key_unref(m->llmnr_host_ipv6_key); | |
623 | ||
624 | sd_event_source_unref(m->hostname_event_source); | |
625 | safe_close(m->hostname_fd); | |
626 | free(m->llmnr_hostname); | |
627 | free(m->mdns_hostname); | |
628 | ||
629 | dns_trust_anchor_flush(&m->trust_anchor); | |
630 | manager_etc_hosts_flush(m); | |
631 | ||
632 | free(m); | |
633 | ||
634 | return NULL; | |
635 | } | |
636 | ||
637 | int manager_recv(Manager *m, int fd, DnsProtocol protocol, DnsPacket **ret) { | |
638 | _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL; | |
639 | union { | |
640 | struct cmsghdr header; /* For alignment */ | |
641 | uint8_t buffer[CMSG_SPACE(MAXSIZE(struct in_pktinfo, struct in6_pktinfo)) | |
642 | + CMSG_SPACE(int) /* ttl/hoplimit */ | |
643 | + EXTRA_CMSG_SPACE /* kernel appears to require extra buffer space */]; | |
644 | } control; | |
645 | union sockaddr_union sa; | |
646 | struct msghdr mh = {}; | |
647 | struct cmsghdr *cmsg; | |
648 | struct iovec iov; | |
649 | ssize_t ms, l; | |
650 | int r; | |
651 | ||
652 | assert(m); | |
653 | assert(fd >= 0); | |
654 | assert(ret); | |
655 | ||
656 | ms = next_datagram_size_fd(fd); | |
657 | if (ms < 0) | |
658 | return ms; | |
659 | ||
660 | r = dns_packet_new(&p, protocol, ms); | |
661 | if (r < 0) | |
662 | return r; | |
663 | ||
664 | iov.iov_base = DNS_PACKET_DATA(p); | |
665 | iov.iov_len = p->allocated; | |
666 | ||
667 | mh.msg_name = &sa.sa; | |
668 | mh.msg_namelen = sizeof(sa); | |
669 | mh.msg_iov = &iov; | |
670 | mh.msg_iovlen = 1; | |
671 | mh.msg_control = &control; | |
672 | mh.msg_controllen = sizeof(control); | |
673 | ||
674 | l = recvmsg(fd, &mh, 0); | |
675 | if (l == 0) | |
676 | return 0; | |
677 | if (l < 0) { | |
678 | if (errno == EAGAIN || errno == EINTR) | |
679 | return 0; | |
680 | ||
681 | return -errno; | |
682 | } | |
683 | ||
684 | assert(!(mh.msg_flags & MSG_CTRUNC)); | |
685 | assert(!(mh.msg_flags & MSG_TRUNC)); | |
686 | ||
687 | p->size = (size_t) l; | |
688 | ||
689 | p->family = sa.sa.sa_family; | |
690 | p->ipproto = IPPROTO_UDP; | |
691 | if (p->family == AF_INET) { | |
692 | p->sender.in = sa.in.sin_addr; | |
693 | p->sender_port = be16toh(sa.in.sin_port); | |
694 | } else if (p->family == AF_INET6) { | |
695 | p->sender.in6 = sa.in6.sin6_addr; | |
696 | p->sender_port = be16toh(sa.in6.sin6_port); | |
697 | p->ifindex = sa.in6.sin6_scope_id; | |
698 | } else | |
699 | return -EAFNOSUPPORT; | |
700 | ||
701 | CMSG_FOREACH(cmsg, &mh) { | |
702 | ||
703 | if (cmsg->cmsg_level == IPPROTO_IPV6) { | |
704 | assert(p->family == AF_INET6); | |
705 | ||
706 | switch (cmsg->cmsg_type) { | |
707 | ||
708 | case IPV6_PKTINFO: { | |
709 | struct in6_pktinfo *i = (struct in6_pktinfo*) CMSG_DATA(cmsg); | |
710 | ||
711 | if (p->ifindex <= 0) | |
712 | p->ifindex = i->ipi6_ifindex; | |
713 | ||
714 | p->destination.in6 = i->ipi6_addr; | |
715 | break; | |
716 | } | |
717 | ||
718 | case IPV6_HOPLIMIT: | |
719 | p->ttl = *(int *) CMSG_DATA(cmsg); | |
720 | break; | |
721 | ||
722 | } | |
723 | } else if (cmsg->cmsg_level == IPPROTO_IP) { | |
724 | assert(p->family == AF_INET); | |
725 | ||
726 | switch (cmsg->cmsg_type) { | |
727 | ||
728 | case IP_PKTINFO: { | |
729 | struct in_pktinfo *i = (struct in_pktinfo*) CMSG_DATA(cmsg); | |
730 | ||
731 | if (p->ifindex <= 0) | |
732 | p->ifindex = i->ipi_ifindex; | |
733 | ||
734 | p->destination.in = i->ipi_addr; | |
735 | break; | |
736 | } | |
737 | ||
738 | case IP_TTL: | |
739 | p->ttl = *(int *) CMSG_DATA(cmsg); | |
740 | break; | |
741 | } | |
742 | } | |
743 | } | |
744 | ||
745 | /* The Linux kernel sets the interface index to the loopback | |
746 | * device if the packet came from the local host since it | |
747 | * avoids the routing table in such a case. Let's unset the | |
748 | * interface index in such a case. */ | |
749 | if (p->ifindex == LOOPBACK_IFINDEX) | |
750 | p->ifindex = 0; | |
751 | ||
752 | if (protocol != DNS_PROTOCOL_DNS) { | |
753 | /* If we don't know the interface index still, we look for the | |
754 | * first local interface with a matching address. Yuck! */ | |
755 | if (p->ifindex <= 0) | |
756 | p->ifindex = manager_find_ifindex(m, p->family, &p->destination); | |
757 | } | |
758 | ||
759 | *ret = p; | |
760 | p = NULL; | |
761 | ||
762 | return 1; | |
763 | } | |
764 | ||
765 | static int sendmsg_loop(int fd, struct msghdr *mh, int flags) { | |
766 | int r; | |
767 | ||
768 | assert(fd >= 0); | |
769 | assert(mh); | |
770 | ||
771 | for (;;) { | |
772 | if (sendmsg(fd, mh, flags) >= 0) | |
773 | return 0; | |
774 | ||
775 | if (errno == EINTR) | |
776 | continue; | |
777 | ||
778 | if (errno != EAGAIN) | |
779 | return -errno; | |
780 | ||
781 | r = fd_wait_for_event(fd, POLLOUT, SEND_TIMEOUT_USEC); | |
782 | if (r < 0) | |
783 | return r; | |
784 | if (r == 0) | |
785 | return -ETIMEDOUT; | |
786 | } | |
787 | } | |
788 | ||
789 | static int write_loop(int fd, void *message, size_t length) { | |
790 | int r; | |
791 | ||
792 | assert(fd >= 0); | |
793 | assert(message); | |
794 | ||
795 | for (;;) { | |
796 | if (write(fd, message, length) >= 0) | |
797 | return 0; | |
798 | ||
799 | if (errno == EINTR) | |
800 | continue; | |
801 | ||
802 | if (errno != EAGAIN) | |
803 | return -errno; | |
804 | ||
805 | r = fd_wait_for_event(fd, POLLOUT, SEND_TIMEOUT_USEC); | |
806 | if (r < 0) | |
807 | return r; | |
808 | if (r == 0) | |
809 | return -ETIMEDOUT; | |
810 | } | |
811 | } | |
812 | ||
813 | int manager_write(Manager *m, int fd, DnsPacket *p) { | |
814 | int r; | |
815 | ||
816 | log_debug("Sending %s packet with id %" PRIu16 ".", DNS_PACKET_QR(p) ? "response" : "query", DNS_PACKET_ID(p)); | |
817 | ||
818 | r = write_loop(fd, DNS_PACKET_DATA(p), p->size); | |
819 | if (r < 0) | |
820 | return r; | |
821 | ||
822 | return 0; | |
823 | } | |
824 | ||
825 | static int manager_ipv4_send( | |
826 | Manager *m, | |
827 | int fd, | |
828 | int ifindex, | |
829 | const struct in_addr *destination, | |
830 | uint16_t port, | |
831 | const struct in_addr *source, | |
832 | DnsPacket *p) { | |
833 | union sockaddr_union sa = { | |
834 | .in.sin_family = AF_INET, | |
835 | }; | |
836 | union { | |
837 | struct cmsghdr header; /* For alignment */ | |
838 | uint8_t buffer[CMSG_SPACE(sizeof(struct in_pktinfo))]; | |
839 | } control; | |
840 | struct msghdr mh = {}; | |
841 | struct iovec iov; | |
842 | ||
843 | assert(m); | |
844 | assert(fd >= 0); | |
845 | assert(destination); | |
846 | assert(port > 0); | |
847 | assert(p); | |
848 | ||
849 | iov.iov_base = DNS_PACKET_DATA(p); | |
850 | iov.iov_len = p->size; | |
851 | ||
852 | sa.in.sin_addr = *destination; | |
853 | sa.in.sin_port = htobe16(port), | |
854 | ||
855 | mh.msg_iov = &iov; | |
856 | mh.msg_iovlen = 1; | |
857 | mh.msg_name = &sa.sa; | |
858 | mh.msg_namelen = sizeof(sa.in); | |
859 | ||
860 | if (ifindex > 0) { | |
861 | struct cmsghdr *cmsg; | |
862 | struct in_pktinfo *pi; | |
863 | ||
864 | zero(control); | |
865 | ||
866 | mh.msg_control = &control; | |
867 | mh.msg_controllen = CMSG_LEN(sizeof(struct in_pktinfo)); | |
868 | ||
869 | cmsg = CMSG_FIRSTHDR(&mh); | |
870 | cmsg->cmsg_len = mh.msg_controllen; | |
871 | cmsg->cmsg_level = IPPROTO_IP; | |
872 | cmsg->cmsg_type = IP_PKTINFO; | |
873 | ||
874 | pi = (struct in_pktinfo*) CMSG_DATA(cmsg); | |
875 | pi->ipi_ifindex = ifindex; | |
876 | ||
877 | if (source) | |
878 | pi->ipi_spec_dst = *source; | |
879 | } | |
880 | ||
881 | return sendmsg_loop(fd, &mh, 0); | |
882 | } | |
883 | ||
884 | static int manager_ipv6_send( | |
885 | Manager *m, | |
886 | int fd, | |
887 | int ifindex, | |
888 | const struct in6_addr *destination, | |
889 | uint16_t port, | |
890 | const struct in6_addr *source, | |
891 | DnsPacket *p) { | |
892 | ||
893 | union sockaddr_union sa = { | |
894 | .in6.sin6_family = AF_INET6, | |
895 | }; | |
896 | union { | |
897 | struct cmsghdr header; /* For alignment */ | |
898 | uint8_t buffer[CMSG_SPACE(sizeof(struct in6_pktinfo))]; | |
899 | } control; | |
900 | struct msghdr mh = {}; | |
901 | struct iovec iov; | |
902 | ||
903 | assert(m); | |
904 | assert(fd >= 0); | |
905 | assert(destination); | |
906 | assert(port > 0); | |
907 | assert(p); | |
908 | ||
909 | iov.iov_base = DNS_PACKET_DATA(p); | |
910 | iov.iov_len = p->size; | |
911 | ||
912 | sa.in6.sin6_addr = *destination; | |
913 | sa.in6.sin6_port = htobe16(port), | |
914 | sa.in6.sin6_scope_id = ifindex; | |
915 | ||
916 | mh.msg_iov = &iov; | |
917 | mh.msg_iovlen = 1; | |
918 | mh.msg_name = &sa.sa; | |
919 | mh.msg_namelen = sizeof(sa.in6); | |
920 | ||
921 | if (ifindex > 0) { | |
922 | struct cmsghdr *cmsg; | |
923 | struct in6_pktinfo *pi; | |
924 | ||
925 | zero(control); | |
926 | ||
927 | mh.msg_control = &control; | |
928 | mh.msg_controllen = CMSG_LEN(sizeof(struct in6_pktinfo)); | |
929 | ||
930 | cmsg = CMSG_FIRSTHDR(&mh); | |
931 | cmsg->cmsg_len = mh.msg_controllen; | |
932 | cmsg->cmsg_level = IPPROTO_IPV6; | |
933 | cmsg->cmsg_type = IPV6_PKTINFO; | |
934 | ||
935 | pi = (struct in6_pktinfo*) CMSG_DATA(cmsg); | |
936 | pi->ipi6_ifindex = ifindex; | |
937 | ||
938 | if (source) | |
939 | pi->ipi6_addr = *source; | |
940 | } | |
941 | ||
942 | return sendmsg_loop(fd, &mh, 0); | |
943 | } | |
944 | ||
945 | int manager_send( | |
946 | Manager *m, | |
947 | int fd, | |
948 | int ifindex, | |
949 | int family, | |
950 | const union in_addr_union *destination, | |
951 | uint16_t port, | |
952 | const union in_addr_union *source, | |
953 | DnsPacket *p) { | |
954 | ||
955 | assert(m); | |
956 | assert(fd >= 0); | |
957 | assert(destination); | |
958 | assert(port > 0); | |
959 | assert(p); | |
960 | ||
961 | 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)); | |
962 | ||
963 | if (family == AF_INET) | |
964 | return manager_ipv4_send(m, fd, ifindex, &destination->in, port, &source->in, p); | |
965 | if (family == AF_INET6) | |
966 | return manager_ipv6_send(m, fd, ifindex, &destination->in6, port, &source->in6, p); | |
967 | ||
968 | return -EAFNOSUPPORT; | |
969 | } | |
970 | ||
971 | uint32_t manager_find_mtu(Manager *m) { | |
972 | uint32_t mtu = 0; | |
973 | Link *l; | |
974 | Iterator i; | |
975 | ||
976 | /* If we don't know on which link a DNS packet would be | |
977 | * delivered, let's find the largest MTU that works on all | |
978 | * interfaces we know of */ | |
979 | ||
980 | HASHMAP_FOREACH(l, m->links, i) { | |
981 | if (l->mtu <= 0) | |
982 | continue; | |
983 | ||
984 | if (mtu <= 0 || l->mtu < mtu) | |
985 | mtu = l->mtu; | |
986 | } | |
987 | ||
988 | return mtu; | |
989 | } | |
990 | ||
991 | int manager_find_ifindex(Manager *m, int family, const union in_addr_union *in_addr) { | |
992 | LinkAddress *a; | |
993 | ||
994 | assert(m); | |
995 | ||
996 | a = manager_find_link_address(m, family, in_addr); | |
997 | if (a) | |
998 | return a->link->ifindex; | |
999 | ||
1000 | return 0; | |
1001 | } | |
1002 | ||
1003 | void manager_refresh_rrs(Manager *m) { | |
1004 | Iterator i; | |
1005 | Link *l; | |
1006 | ||
1007 | assert(m); | |
1008 | ||
1009 | m->llmnr_host_ipv4_key = dns_resource_key_unref(m->llmnr_host_ipv4_key); | |
1010 | m->llmnr_host_ipv6_key = dns_resource_key_unref(m->llmnr_host_ipv6_key); | |
1011 | ||
1012 | HASHMAP_FOREACH(l, m->links, i) { | |
1013 | link_add_rrs(l, true); | |
1014 | link_add_rrs(l, false); | |
1015 | } | |
1016 | } | |
1017 | ||
1018 | int manager_next_hostname(Manager *m) { | |
1019 | const char *p; | |
1020 | uint64_t u, a; | |
1021 | char *h, *k; | |
1022 | int r; | |
1023 | ||
1024 | assert(m); | |
1025 | ||
1026 | p = strchr(m->llmnr_hostname, 0); | |
1027 | assert(p); | |
1028 | ||
1029 | while (p > m->llmnr_hostname) { | |
1030 | if (!strchr("0123456789", p[-1])) | |
1031 | break; | |
1032 | ||
1033 | p--; | |
1034 | } | |
1035 | ||
1036 | if (*p == 0 || safe_atou64(p, &u) < 0 || u <= 0) | |
1037 | u = 1; | |
1038 | ||
1039 | /* Add a random number to the old value. This way we can avoid | |
1040 | * that two hosts pick the same hostname, win on IPv4 and lose | |
1041 | * on IPv6 (or vice versa), and pick the same hostname | |
1042 | * replacement hostname, ad infinitum. We still want the | |
1043 | * numbers to go up monotonically, hence we just add a random | |
1044 | * value 1..10 */ | |
1045 | ||
1046 | random_bytes(&a, sizeof(a)); | |
1047 | u += 1 + a % 10; | |
1048 | ||
1049 | if (asprintf(&h, "%.*s%" PRIu64, (int) (p - m->llmnr_hostname), m->llmnr_hostname, u) < 0) | |
1050 | return -ENOMEM; | |
1051 | ||
1052 | r = dns_name_concat(h, "local", &k); | |
1053 | if (r < 0) { | |
1054 | free(h); | |
1055 | return r; | |
1056 | } | |
1057 | ||
1058 | log_info("Hostname conflict, changing published hostname from '%s' to '%s'.", m->llmnr_hostname, h); | |
1059 | ||
1060 | free(m->llmnr_hostname); | |
1061 | m->llmnr_hostname = h; | |
1062 | ||
1063 | free(m->mdns_hostname); | |
1064 | m->mdns_hostname = k; | |
1065 | ||
1066 | manager_refresh_rrs(m); | |
1067 | ||
1068 | return 0; | |
1069 | } | |
1070 | ||
1071 | LinkAddress* manager_find_link_address(Manager *m, int family, const union in_addr_union *in_addr) { | |
1072 | Iterator i; | |
1073 | Link *l; | |
1074 | ||
1075 | assert(m); | |
1076 | ||
1077 | HASHMAP_FOREACH(l, m->links, i) { | |
1078 | LinkAddress *a; | |
1079 | ||
1080 | a = link_find_address(l, family, in_addr); | |
1081 | if (a) | |
1082 | return a; | |
1083 | } | |
1084 | ||
1085 | return NULL; | |
1086 | } | |
1087 | ||
1088 | bool manager_our_packet(Manager *m, DnsPacket *p) { | |
1089 | assert(m); | |
1090 | assert(p); | |
1091 | ||
1092 | return !!manager_find_link_address(m, p->family, &p->sender); | |
1093 | } | |
1094 | ||
1095 | DnsScope* manager_find_scope(Manager *m, DnsPacket *p) { | |
1096 | Link *l; | |
1097 | ||
1098 | assert(m); | |
1099 | assert(p); | |
1100 | ||
1101 | l = hashmap_get(m->links, INT_TO_PTR(p->ifindex)); | |
1102 | if (!l) | |
1103 | return NULL; | |
1104 | ||
1105 | switch (p->protocol) { | |
1106 | case DNS_PROTOCOL_LLMNR: | |
1107 | if (p->family == AF_INET) | |
1108 | return l->llmnr_ipv4_scope; | |
1109 | else if (p->family == AF_INET6) | |
1110 | return l->llmnr_ipv6_scope; | |
1111 | ||
1112 | break; | |
1113 | ||
1114 | case DNS_PROTOCOL_MDNS: | |
1115 | if (p->family == AF_INET) | |
1116 | return l->mdns_ipv4_scope; | |
1117 | else if (p->family == AF_INET6) | |
1118 | return l->mdns_ipv6_scope; | |
1119 | ||
1120 | break; | |
1121 | ||
1122 | default: | |
1123 | break; | |
1124 | } | |
1125 | ||
1126 | return NULL; | |
1127 | } | |
1128 | ||
1129 | void manager_verify_all(Manager *m) { | |
1130 | DnsScope *s; | |
1131 | ||
1132 | assert(m); | |
1133 | ||
1134 | LIST_FOREACH(scopes, s, m->dns_scopes) | |
1135 | dns_zone_verify_all(&s->zone); | |
1136 | } | |
1137 | ||
1138 | int manager_is_own_hostname(Manager *m, const char *name) { | |
1139 | int r; | |
1140 | ||
1141 | assert(m); | |
1142 | assert(name); | |
1143 | ||
1144 | if (m->llmnr_hostname) { | |
1145 | r = dns_name_equal(name, m->llmnr_hostname); | |
1146 | if (r != 0) | |
1147 | return r; | |
1148 | } | |
1149 | ||
1150 | if (m->mdns_hostname) | |
1151 | return dns_name_equal(name, m->mdns_hostname); | |
1152 | ||
1153 | return 0; | |
1154 | } | |
1155 | ||
1156 | int manager_compile_dns_servers(Manager *m, OrderedSet **dns) { | |
1157 | DnsServer *s; | |
1158 | Iterator i; | |
1159 | Link *l; | |
1160 | int r; | |
1161 | ||
1162 | assert(m); | |
1163 | assert(dns); | |
1164 | ||
1165 | r = ordered_set_ensure_allocated(dns, &dns_server_hash_ops); | |
1166 | if (r < 0) | |
1167 | return r; | |
1168 | ||
1169 | /* First add the system-wide servers and domains */ | |
1170 | LIST_FOREACH(servers, s, m->dns_servers) { | |
1171 | r = ordered_set_put(*dns, s); | |
1172 | if (r == -EEXIST) | |
1173 | continue; | |
1174 | if (r < 0) | |
1175 | return r; | |
1176 | } | |
1177 | ||
1178 | /* Then, add the per-link servers */ | |
1179 | HASHMAP_FOREACH(l, m->links, i) { | |
1180 | LIST_FOREACH(servers, s, l->dns_servers) { | |
1181 | r = ordered_set_put(*dns, s); | |
1182 | if (r == -EEXIST) | |
1183 | continue; | |
1184 | if (r < 0) | |
1185 | return r; | |
1186 | } | |
1187 | } | |
1188 | ||
1189 | /* If we found nothing, add the fallback servers */ | |
1190 | if (ordered_set_isempty(*dns)) { | |
1191 | LIST_FOREACH(servers, s, m->fallback_dns_servers) { | |
1192 | r = ordered_set_put(*dns, s); | |
1193 | if (r == -EEXIST) | |
1194 | continue; | |
1195 | if (r < 0) | |
1196 | return r; | |
1197 | } | |
1198 | } | |
1199 | ||
1200 | return 0; | |
1201 | } | |
1202 | ||
1203 | int manager_compile_search_domains(Manager *m, OrderedSet **domains, int filter_route) { | |
1204 | DnsSearchDomain *d; | |
1205 | Iterator i; | |
1206 | Link *l; | |
1207 | int r; | |
1208 | ||
1209 | assert(m); | |
1210 | assert(domains); | |
1211 | ||
1212 | r = ordered_set_ensure_allocated(domains, &dns_name_hash_ops); | |
1213 | if (r < 0) | |
1214 | return r; | |
1215 | ||
1216 | LIST_FOREACH(domains, d, m->search_domains) { | |
1217 | ||
1218 | if (filter_route >= 0 && | |
1219 | d->route_only != !!filter_route) | |
1220 | continue; | |
1221 | ||
1222 | r = ordered_set_put(*domains, d->name); | |
1223 | if (r == -EEXIST) | |
1224 | continue; | |
1225 | if (r < 0) | |
1226 | return r; | |
1227 | } | |
1228 | ||
1229 | HASHMAP_FOREACH(l, m->links, i) { | |
1230 | ||
1231 | LIST_FOREACH(domains, d, l->search_domains) { | |
1232 | ||
1233 | if (filter_route >= 0 && | |
1234 | d->route_only != !!filter_route) | |
1235 | continue; | |
1236 | ||
1237 | r = ordered_set_put(*domains, d->name); | |
1238 | if (r == -EEXIST) | |
1239 | continue; | |
1240 | if (r < 0) | |
1241 | return r; | |
1242 | } | |
1243 | } | |
1244 | ||
1245 | return 0; | |
1246 | } | |
1247 | ||
1248 | DnssecMode manager_get_dnssec_mode(Manager *m) { | |
1249 | assert(m); | |
1250 | ||
1251 | if (m->dnssec_mode != _DNSSEC_MODE_INVALID) | |
1252 | return m->dnssec_mode; | |
1253 | ||
1254 | return DNSSEC_NO; | |
1255 | } | |
1256 | ||
1257 | bool manager_dnssec_supported(Manager *m) { | |
1258 | DnsServer *server; | |
1259 | Iterator i; | |
1260 | Link *l; | |
1261 | ||
1262 | assert(m); | |
1263 | ||
1264 | if (manager_get_dnssec_mode(m) == DNSSEC_NO) | |
1265 | return false; | |
1266 | ||
1267 | server = manager_get_dns_server(m); | |
1268 | if (server && !dns_server_dnssec_supported(server)) | |
1269 | return false; | |
1270 | ||
1271 | HASHMAP_FOREACH(l, m->links, i) | |
1272 | if (!link_dnssec_supported(l)) | |
1273 | return false; | |
1274 | ||
1275 | return true; | |
1276 | } | |
1277 | ||
1278 | void manager_dnssec_verdict(Manager *m, DnssecVerdict verdict, const DnsResourceKey *key) { | |
1279 | ||
1280 | assert(verdict >= 0); | |
1281 | assert(verdict < _DNSSEC_VERDICT_MAX); | |
1282 | ||
1283 | if (log_get_max_level() >= LOG_DEBUG) { | |
1284 | char s[DNS_RESOURCE_KEY_STRING_MAX]; | |
1285 | ||
1286 | log_debug("Found verdict for lookup %s: %s", | |
1287 | dns_resource_key_to_string(key, s, sizeof s), | |
1288 | dnssec_verdict_to_string(verdict)); | |
1289 | } | |
1290 | ||
1291 | m->n_dnssec_verdict[verdict]++; | |
1292 | } | |
1293 | ||
1294 | bool manager_routable(Manager *m, int family) { | |
1295 | Iterator i; | |
1296 | Link *l; | |
1297 | ||
1298 | assert(m); | |
1299 | ||
1300 | /* Returns true if the host has at least one interface with a routable address of the specified type */ | |
1301 | ||
1302 | HASHMAP_FOREACH(l, m->links, i) | |
1303 | if (link_relevant(l, family, false)) | |
1304 | return true; | |
1305 | ||
1306 | return false; | |
1307 | } | |
1308 | ||
1309 | void manager_flush_caches(Manager *m) { | |
1310 | DnsScope *scope; | |
1311 | ||
1312 | assert(m); | |
1313 | ||
1314 | LIST_FOREACH(scopes, scope, m->dns_scopes) | |
1315 | dns_cache_flush(&scope->cache); | |
1316 | ||
1317 | log_info("Flushed all caches."); | |
1318 | } | |
1319 | ||
1320 | void manager_cleanup_saved_user(Manager *m) { | |
1321 | _cleanup_closedir_ DIR *d = NULL; | |
1322 | struct dirent *de; | |
1323 | int r; | |
1324 | ||
1325 | assert(m); | |
1326 | ||
1327 | /* Clean up all saved per-link files in /run/systemd/resolve/netif/ that don't have a matching interface | |
1328 | * anymore. These files are created to persist settings pushed in by the user via the bus, so that resolved can | |
1329 | * be restarted without losing this data. */ | |
1330 | ||
1331 | d = opendir("/run/systemd/resolve/netif/"); | |
1332 | if (!d) { | |
1333 | if (errno == ENOENT) | |
1334 | return; | |
1335 | ||
1336 | log_warning_errno(errno, "Failed to open interface directory: %m"); | |
1337 | return; | |
1338 | } | |
1339 | ||
1340 | FOREACH_DIRENT_ALL(de, d, log_error_errno(errno, "Failed to read interface directory: %m")) { | |
1341 | _cleanup_free_ char *p = NULL; | |
1342 | int ifindex; | |
1343 | Link *l; | |
1344 | ||
1345 | if (!IN_SET(de->d_type, DT_UNKNOWN, DT_REG)) | |
1346 | continue; | |
1347 | ||
1348 | if (STR_IN_SET(de->d_name, ".", "..")) | |
1349 | continue; | |
1350 | ||
1351 | r = parse_ifindex(de->d_name, &ifindex); | |
1352 | if (r < 0) /* Probably some temporary file from a previous run. Delete it */ | |
1353 | goto rm; | |
1354 | ||
1355 | l = hashmap_get(m->links, INT_TO_PTR(ifindex)); | |
1356 | if (!l) /* link vanished */ | |
1357 | goto rm; | |
1358 | ||
1359 | if (l->is_managed) /* now managed by networkd, hence the bus settings are useless */ | |
1360 | goto rm; | |
1361 | ||
1362 | continue; | |
1363 | ||
1364 | rm: | |
1365 | p = strappend("/run/systemd/resolve/netif/", de->d_name); | |
1366 | if (!p) { | |
1367 | log_oom(); | |
1368 | return; | |
1369 | } | |
1370 | ||
1371 | (void) unlink(p); | |
1372 | } | |
1373 | } |