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091a364c TG |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2014 Tom Gundersen <teg@jklm.no> | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | #include <arpa/inet.h> | |
23 | #include <resolv.h> | |
1716f6dc | 24 | #include <net/if.h> |
74b2466e LP |
25 | #include <sys/ioctl.h> |
26 | #include <sys/poll.h> | |
27 | #include <netinet/in.h> | |
091a364c | 28 | |
74b2466e | 29 | #include "rtnl-util.h" |
091a364c TG |
30 | #include "event-util.h" |
31 | #include "network-util.h" | |
091a364c TG |
32 | #include "network-internal.h" |
33 | #include "conf-parser.h" | |
74b2466e | 34 | #include "socket-util.h" |
a2a416f7 | 35 | #include "af-list.h" |
eb60f9cd | 36 | #include "utf8.h" |
4e945a6f | 37 | |
eb60f9cd | 38 | #include "resolved-dns-domain.h" |
39d8db04 LP |
39 | #include "resolved-conf.h" |
40 | #include "resolved-bus.h" | |
41 | #include "resolved-manager.h" | |
74b2466e LP |
42 | |
43 | #define SEND_TIMEOUT_USEC (200 * USEC_PER_MSEC) | |
44 | ||
45 | static int manager_process_link(sd_rtnl *rtnl, sd_rtnl_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_rtnl_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 | ||
a2a416f7 LP |
67 | case RTM_NEWLINK:{ |
68 | bool is_new = !l; | |
74b2466e | 69 | |
a2a416f7 | 70 | if (!l) { |
74b2466e LP |
71 | r = link_new(m, &l, ifindex); |
72 | if (r < 0) | |
73 | goto fail; | |
74 | } | |
75 | ||
76 | r = link_update_rtnl(l, mm); | |
77 | if (r < 0) | |
78 | goto fail; | |
79 | ||
21d73c87 LP |
80 | r = link_update_monitor(l); |
81 | if (r < 0) | |
82 | goto fail; | |
83 | ||
a2a416f7 LP |
84 | if (is_new) |
85 | log_debug("Found new link %i/%s", ifindex, l->name); | |
86 | ||
74b2466e | 87 | break; |
a2a416f7 | 88 | } |
74b2466e LP |
89 | |
90 | case RTM_DELLINK: | |
91 | if (l) { | |
a2a416f7 | 92 | log_debug("Removing link %i/%s", l->ifindex, l->name); |
74b2466e LP |
93 | link_free(l); |
94 | } | |
95 | ||
96 | break; | |
97 | } | |
98 | ||
99 | return 0; | |
100 | ||
101 | fail: | |
102 | log_warning("Failed to process RTNL link message: %s", strerror(-r)); | |
103 | return 0; | |
104 | } | |
105 | ||
106 | static int manager_process_address(sd_rtnl *rtnl, sd_rtnl_message *mm, void *userdata) { | |
107 | Manager *m = userdata; | |
108 | union in_addr_union address; | |
74b2466e | 109 | uint16_t type; |
0dd25fb9 | 110 | int r, ifindex, family; |
74b2466e LP |
111 | LinkAddress *a; |
112 | Link *l; | |
113 | ||
114 | assert(rtnl); | |
115 | assert(mm); | |
116 | assert(m); | |
117 | ||
118 | r = sd_rtnl_message_get_type(mm, &type); | |
119 | if (r < 0) | |
120 | goto fail; | |
121 | ||
122 | r = sd_rtnl_message_addr_get_ifindex(mm, &ifindex); | |
123 | if (r < 0) | |
124 | goto fail; | |
125 | ||
126 | l = hashmap_get(m->links, INT_TO_PTR(ifindex)); | |
127 | if (!l) | |
128 | return 0; | |
129 | ||
130 | r = sd_rtnl_message_addr_get_family(mm, &family); | |
131 | if (r < 0) | |
132 | goto fail; | |
133 | ||
134 | switch (family) { | |
135 | ||
136 | case AF_INET: | |
137 | r = sd_rtnl_message_read_in_addr(mm, IFA_LOCAL, &address.in); | |
138 | if (r < 0) { | |
139 | r = sd_rtnl_message_read_in_addr(mm, IFA_ADDRESS, &address.in); | |
140 | if (r < 0) | |
141 | goto fail; | |
142 | } | |
143 | ||
144 | break; | |
145 | ||
146 | case AF_INET6: | |
147 | r = sd_rtnl_message_read_in6_addr(mm, IFA_LOCAL, &address.in6); | |
148 | if (r < 0) { | |
149 | r = sd_rtnl_message_read_in6_addr(mm, IFA_ADDRESS, &address.in6); | |
150 | if (r < 0) | |
151 | goto fail; | |
152 | } | |
153 | ||
154 | break; | |
155 | ||
156 | default: | |
157 | return 0; | |
158 | } | |
159 | ||
160 | a = link_find_address(l, family, &address); | |
161 | ||
162 | switch (type) { | |
163 | ||
164 | case RTM_NEWADDR: | |
165 | ||
166 | if (!a) { | |
167 | r = link_address_new(l, &a, family, &address); | |
168 | if (r < 0) | |
169 | return r; | |
170 | } | |
171 | ||
172 | r = link_address_update_rtnl(a, mm); | |
173 | if (r < 0) | |
174 | return r; | |
175 | ||
176 | break; | |
177 | ||
178 | case RTM_DELADDR: | |
179 | if (a) | |
180 | link_address_free(a); | |
181 | break; | |
182 | } | |
183 | ||
184 | return 0; | |
185 | ||
186 | fail: | |
187 | log_warning("Failed to process RTNL address message: %s", strerror(-r)); | |
188 | return 0; | |
189 | } | |
190 | ||
74b2466e LP |
191 | static int manager_rtnl_listen(Manager *m) { |
192 | _cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL, *reply = NULL; | |
193 | sd_rtnl_message *i; | |
194 | int r; | |
195 | ||
196 | assert(m); | |
197 | ||
198 | /* First, subscibe to interfaces coming and going */ | |
199 | r = sd_rtnl_open(&m->rtnl, 3, RTNLGRP_LINK, RTNLGRP_IPV4_IFADDR, RTNLGRP_IPV6_IFADDR); | |
200 | if (r < 0) | |
201 | return r; | |
202 | ||
203 | r = sd_rtnl_attach_event(m->rtnl, m->event, 0); | |
204 | if (r < 0) | |
205 | return r; | |
206 | ||
207 | r = sd_rtnl_add_match(m->rtnl, RTM_NEWLINK, manager_process_link, m); | |
208 | if (r < 0) | |
209 | return r; | |
210 | ||
211 | r = sd_rtnl_add_match(m->rtnl, RTM_DELLINK, manager_process_link, m); | |
212 | if (r < 0) | |
213 | return r; | |
214 | ||
215 | r = sd_rtnl_add_match(m->rtnl, RTM_NEWADDR, manager_process_address, m); | |
216 | if (r < 0) | |
217 | return r; | |
091a364c | 218 | |
74b2466e LP |
219 | r = sd_rtnl_add_match(m->rtnl, RTM_DELADDR, manager_process_address, m); |
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_rtnl_message_request_dump(req, true); | |
229 | if (r < 0) | |
230 | return r; | |
231 | ||
232 | r = sd_rtnl_call(m->rtnl, req, 0, &reply); | |
233 | if (r < 0) | |
234 | return r; | |
235 | ||
236 | for (i = reply; i; i = sd_rtnl_message_next(i)) { | |
237 | r = manager_process_link(m->rtnl, i, m); | |
238 | if (r < 0) | |
239 | return r; | |
240 | } | |
241 | ||
242 | req = sd_rtnl_message_unref(req); | |
243 | reply = sd_rtnl_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_rtnl_message_request_dump(req, true); | |
251 | if (r < 0) | |
252 | return r; | |
253 | ||
254 | r = sd_rtnl_call(m->rtnl, req, 0, &reply); | |
255 | if (r < 0) | |
256 | return r; | |
257 | ||
258 | for (i = reply; i; i = sd_rtnl_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_monitor(l); | |
279 | if (r < 0) | |
280 | log_warning("Failed to update monitor information for %i: %s", l->ifindex, strerror(-r)); | |
281 | } | |
282 | ||
283 | r = manager_write_resolv_conf(m); | |
284 | if (r < 0) | |
285 | log_warning("Could not update resolv.conf: %s", strerror(-r)); | |
286 | ||
287 | return 0; | |
288 | } | |
289 | ||
290 | static int manager_network_monitor_listen(Manager *m) { | |
291 | int r, fd, events; | |
292 | ||
293 | assert(m); | |
294 | ||
0014a4ad | 295 | r = sd_network_monitor_new(&m->network_monitor, NULL); |
74b2466e LP |
296 | if (r < 0) |
297 | return r; | |
298 | ||
299 | fd = sd_network_monitor_get_fd(m->network_monitor); | |
300 | if (fd < 0) | |
301 | return fd; | |
302 | ||
303 | events = sd_network_monitor_get_events(m->network_monitor); | |
304 | if (events < 0) | |
305 | return events; | |
306 | ||
307 | r = sd_event_add_io(m->event, &m->network_event_source, fd, events, &on_network_event, m); | |
308 | if (r < 0) | |
309 | return r; | |
310 | ||
311 | return 0; | |
312 | } | |
313 | ||
eb60f9cd LP |
314 | static int determine_hostname(char **ret) { |
315 | _cleanup_free_ char *h = NULL, *n = NULL; | |
316 | int r; | |
317 | ||
318 | assert(ret); | |
319 | ||
320 | h = gethostname_malloc(); | |
321 | if (!h) | |
322 | return log_oom(); | |
323 | ||
324 | if (!utf8_is_valid(h)) { | |
325 | log_error("System hostname is not UTF-8 clean."); | |
326 | return -EINVAL; | |
327 | } | |
328 | ||
329 | r = dns_name_normalize(h, &n); | |
330 | if (r < 0) { | |
331 | log_error("System hostname '%s' cannot be normalized.", h); | |
332 | return r; | |
333 | } | |
334 | ||
335 | *ret = n; | |
336 | n = NULL; | |
337 | ||
338 | return 0; | |
339 | } | |
340 | ||
341 | static int on_hostname_change(sd_event_source *es, int fd, uint32_t revents, void *userdata) { | |
342 | _cleanup_free_ char *h = NULL; | |
343 | Manager *m = userdata; | |
344 | int r; | |
345 | ||
346 | assert(m); | |
347 | ||
348 | r = determine_hostname(&h); | |
349 | if (r < 0) | |
350 | return 0; /* ignore invalid hostnames */ | |
351 | ||
352 | if (streq(h, m->hostname)) | |
353 | return 0; | |
354 | ||
355 | log_info("System hostname changed to '%s'.", h); | |
356 | free(m->hostname); | |
357 | m->hostname = h; | |
358 | h = NULL; | |
359 | ||
360 | manager_refresh_rrs(m); | |
361 | ||
362 | return 0; | |
363 | } | |
364 | ||
365 | static int manager_watch_hostname(Manager *m) { | |
eb60f9cd LP |
366 | int r; |
367 | ||
368 | assert(m); | |
369 | ||
370 | m->hostname_fd = open("/proc/sys/kernel/hostname", O_RDONLY|O_CLOEXEC|O_NDELAY|O_NOCTTY); | |
371 | if (m->hostname_fd < 0) { | |
372 | log_warning("Failed to watch hostname: %m"); | |
373 | return 0; | |
374 | } | |
375 | ||
376 | r = sd_event_add_io(m->event, &m->hostname_event_source, m->hostname_fd, 0, on_hostname_change, m); | |
377 | if (r < 0) { | |
378 | if (r == -EPERM) | |
379 | /* kernels prior to 3.2 don't support polling this file. Ignore the failure. */ | |
380 | m->hostname_fd = safe_close(m->hostname_fd); | |
381 | else { | |
382 | log_error("Failed to add hostname event source: %s", strerror(-r)); | |
383 | return r; | |
384 | } | |
385 | } | |
386 | ||
387 | r = determine_hostname(&m->hostname); | |
388 | if (r < 0) { | |
389 | log_info("Defaulting to hostname 'linux'."); | |
390 | m->hostname = strdup("linux"); | |
391 | if (!m->hostname) | |
392 | return log_oom(); | |
393 | } else | |
394 | log_info("Using system hostname '%s'.", m->hostname); | |
395 | ||
396 | return 0; | |
397 | } | |
398 | ||
edc501d4 LP |
399 | static void manager_llmnr_stop(Manager *m) { |
400 | assert(m); | |
401 | ||
402 | m->llmnr_ipv4_udp_event_source = sd_event_source_unref(m->llmnr_ipv4_udp_event_source); | |
403 | m->llmnr_ipv4_udp_fd = safe_close(m->llmnr_ipv4_udp_fd); | |
404 | ||
405 | m->llmnr_ipv6_udp_event_source = sd_event_source_unref(m->llmnr_ipv6_udp_event_source); | |
406 | m->llmnr_ipv6_udp_fd = safe_close(m->llmnr_ipv6_udp_fd); | |
407 | ||
408 | m->llmnr_ipv4_tcp_event_source = sd_event_source_unref(m->llmnr_ipv4_tcp_event_source); | |
409 | m->llmnr_ipv4_tcp_fd = safe_close(m->llmnr_ipv4_tcp_fd); | |
410 | ||
411 | m->llmnr_ipv6_tcp_event_source = sd_event_source_unref(m->llmnr_ipv6_tcp_event_source); | |
412 | m->llmnr_ipv6_tcp_fd = safe_close(m->llmnr_ipv6_tcp_fd); | |
413 | } | |
414 | ||
415 | static int manager_llmnr_start(Manager *m) { | |
416 | int r; | |
417 | ||
418 | assert(m); | |
419 | ||
420 | if (m->llmnr_support == SUPPORT_NO) | |
421 | return 0; | |
422 | ||
423 | r = manager_llmnr_ipv4_udp_fd(m); | |
424 | if (r == -EADDRINUSE) | |
425 | goto eaddrinuse; | |
426 | if (r < 0) | |
427 | return r; | |
428 | ||
429 | r = manager_llmnr_ipv6_udp_fd(m); | |
430 | if (r == -EADDRINUSE) | |
431 | goto eaddrinuse; | |
432 | if (r < 0) | |
433 | return r; | |
434 | ||
435 | r = manager_llmnr_ipv4_tcp_fd(m); | |
436 | if (r == -EADDRINUSE) | |
437 | goto eaddrinuse; | |
438 | if (r < 0) | |
439 | return r; | |
440 | ||
441 | r = manager_llmnr_ipv6_tcp_fd(m); | |
442 | if (r == -EADDRINUSE) | |
443 | goto eaddrinuse; | |
444 | if (r < 0) | |
445 | return r; | |
446 | ||
447 | return 0; | |
448 | ||
449 | eaddrinuse: | |
450 | log_warning("There appears to be another LLMNR respondering running. Turning off LLMNR support."); | |
451 | m->llmnr_support = SUPPORT_NO; | |
452 | manager_llmnr_stop(m); | |
453 | return 0; | |
454 | } | |
455 | ||
091a364c | 456 | int manager_new(Manager **ret) { |
74b2466e | 457 | _cleanup_(manager_freep) Manager *m = NULL; |
091a364c TG |
458 | int r; |
459 | ||
c92e531c LP |
460 | assert(ret); |
461 | ||
091a364c TG |
462 | m = new0(Manager, 1); |
463 | if (!m) | |
464 | return -ENOMEM; | |
465 | ||
74b2466e | 466 | m->dns_ipv4_fd = m->dns_ipv6_fd = -1; |
1716f6dc | 467 | m->llmnr_ipv4_udp_fd = m->llmnr_ipv6_udp_fd = -1; |
623a4c97 | 468 | m->llmnr_ipv4_tcp_fd = m->llmnr_ipv6_tcp_fd = -1; |
eb60f9cd | 469 | m->hostname_fd = -1; |
1716f6dc | 470 | |
4e945a6f | 471 | m->llmnr_support = SUPPORT_YES; |
5cb36f41 | 472 | m->read_resolv_conf = true; |
091a364c | 473 | |
4e945a6f | 474 | r = manager_parse_dns_server(m, DNS_SERVER_FALLBACK, DNS_SERVERS); |
091a364c TG |
475 | if (r < 0) |
476 | return r; | |
477 | ||
478 | r = sd_event_default(&m->event); | |
479 | if (r < 0) | |
480 | return r; | |
481 | ||
482 | sd_event_add_signal(m->event, NULL, SIGTERM, NULL, NULL); | |
483 | sd_event_add_signal(m->event, NULL, SIGINT, NULL, NULL); | |
484 | ||
485 | sd_event_set_watchdog(m->event, true); | |
486 | ||
eb60f9cd LP |
487 | r = manager_watch_hostname(m); |
488 | if (r < 0) | |
489 | return r; | |
490 | ||
1716f6dc | 491 | r = dns_scope_new(m, &m->unicast_scope, NULL, DNS_PROTOCOL_DNS, AF_UNSPEC); |
74b2466e LP |
492 | if (r < 0) |
493 | return r; | |
494 | ||
495 | r = manager_network_monitor_listen(m); | |
496 | if (r < 0) | |
497 | return r; | |
498 | ||
499 | r = manager_rtnl_listen(m); | |
500 | if (r < 0) | |
501 | return r; | |
502 | ||
503 | r = manager_connect_bus(m); | |
504 | if (r < 0) | |
505 | return r; | |
506 | ||
091a364c TG |
507 | *ret = m; |
508 | m = NULL; | |
509 | ||
510 | return 0; | |
511 | } | |
512 | ||
edc501d4 LP |
513 | int manager_start(Manager *m) { |
514 | int r; | |
515 | ||
516 | assert(m); | |
517 | ||
518 | r = manager_llmnr_start(m); | |
519 | if (r < 0) | |
520 | return r; | |
521 | ||
522 | return 0; | |
523 | } | |
524 | ||
74b2466e LP |
525 | Manager *manager_free(Manager *m) { |
526 | Link *l; | |
091a364c TG |
527 | |
528 | if (!m) | |
74b2466e LP |
529 | return NULL; |
530 | ||
74b2466e LP |
531 | while ((l = hashmap_first(m->links))) |
532 | link_free(l); | |
f0e15467 LP |
533 | |
534 | while (m->dns_queries) | |
535 | dns_query_free(m->dns_queries); | |
74b2466e LP |
536 | |
537 | dns_scope_free(m->unicast_scope); | |
538 | ||
539 | while (m->dns_servers) | |
540 | dns_server_free(m->dns_servers); | |
4e945a6f LP |
541 | while (m->fallback_dns_servers) |
542 | dns_server_free(m->fallback_dns_servers); | |
091a364c | 543 | |
f0e15467 LP |
544 | hashmap_free(m->links); |
545 | hashmap_free(m->dns_transactions); | |
546 | ||
096b6773 LP |
547 | sd_event_source_unref(m->network_event_source); |
548 | sd_network_monitor_unref(m->network_monitor); | |
091a364c | 549 | |
74b2466e LP |
550 | sd_event_source_unref(m->dns_ipv4_event_source); |
551 | sd_event_source_unref(m->dns_ipv6_event_source); | |
74b2466e LP |
552 | safe_close(m->dns_ipv4_fd); |
553 | safe_close(m->dns_ipv6_fd); | |
554 | ||
edc501d4 | 555 | manager_llmnr_stop(m); |
623a4c97 | 556 | |
902bb5d8 | 557 | sd_bus_slot_unref(m->prepare_for_sleep_slot); |
74b2466e LP |
558 | sd_event_source_unref(m->bus_retry_event_source); |
559 | sd_bus_unref(m->bus); | |
091a364c | 560 | |
74b2466e | 561 | sd_event_unref(m->event); |
623a4c97 LP |
562 | |
563 | dns_resource_key_unref(m->host_ipv4_key); | |
564 | dns_resource_key_unref(m->host_ipv6_key); | |
eb60f9cd LP |
565 | |
566 | safe_close(m->hostname_fd); | |
567 | sd_event_source_unref(m->hostname_event_source); | |
623a4c97 | 568 | free(m->hostname); |
eb60f9cd | 569 | |
091a364c | 570 | free(m); |
74b2466e LP |
571 | |
572 | return NULL; | |
091a364c TG |
573 | } |
574 | ||
5cb36f41 LP |
575 | int manager_read_resolv_conf(Manager *m) { |
576 | _cleanup_fclose_ FILE *f = NULL; | |
577 | struct stat st, own; | |
578 | char line[LINE_MAX]; | |
579 | DnsServer *s, *nx; | |
580 | usec_t t; | |
581 | int r; | |
582 | ||
583 | assert(m); | |
584 | ||
585 | /* Reads the system /etc/resolv.conf, if it exists and is not | |
586 | * symlinked to our own resolv.conf instance */ | |
587 | ||
588 | if (!m->read_resolv_conf) | |
589 | return 0; | |
590 | ||
591 | r = stat("/etc/resolv.conf", &st); | |
592 | if (r < 0) { | |
593 | if (errno != ENOENT) | |
594 | log_warning("Failed to open /etc/resolv.conf: %m"); | |
595 | r = -errno; | |
596 | goto clear; | |
597 | } | |
598 | ||
599 | /* Have we already seen the file? */ | |
600 | t = timespec_load(&st.st_mtim); | |
601 | if (t == m->resolv_conf_mtime) | |
602 | return 0; | |
603 | ||
604 | m->resolv_conf_mtime = t; | |
605 | ||
606 | /* Is it symlinked to our own file? */ | |
607 | if (stat("/run/systemd/resolve/resolv.conf", &own) >= 0 && | |
608 | st.st_dev == own.st_dev && | |
609 | st.st_ino == own.st_ino) { | |
610 | r = 0; | |
611 | goto clear; | |
612 | } | |
613 | ||
614 | f = fopen("/etc/resolv.conf", "re"); | |
615 | if (!f) { | |
616 | if (errno != ENOENT) | |
617 | log_warning("Failed to open /etc/resolv.conf: %m"); | |
618 | r = -errno; | |
619 | goto clear; | |
620 | } | |
621 | ||
622 | if (fstat(fileno(f), &st) < 0) { | |
623 | log_error("Failed to stat open file: %m"); | |
624 | r = -errno; | |
625 | goto clear; | |
626 | } | |
627 | ||
628 | LIST_FOREACH(servers, s, m->dns_servers) | |
629 | s->marked = true; | |
630 | ||
631 | FOREACH_LINE(line, f, r = -errno; goto clear) { | |
632 | union in_addr_union address; | |
633 | int family; | |
634 | char *l; | |
635 | const char *a; | |
636 | ||
637 | truncate_nl(line); | |
638 | ||
639 | l = strstrip(line); | |
640 | if (*l == '#' || *l == ';') | |
641 | continue; | |
642 | ||
643 | a = first_word(l, "nameserver"); | |
644 | if (!a) | |
645 | continue; | |
646 | ||
647 | r = in_addr_from_string_auto(a, &family, &address); | |
648 | if (r < 0) { | |
649 | log_warning("Failed to parse name server %s.", a); | |
650 | continue; | |
651 | } | |
652 | ||
653 | LIST_FOREACH(servers, s, m->dns_servers) | |
654 | if (s->family == family && in_addr_equal(family, &s->address, &address) > 0) | |
655 | break; | |
656 | ||
657 | if (s) | |
658 | s->marked = false; | |
659 | else { | |
660 | r = dns_server_new(m, NULL, DNS_SERVER_SYSTEM, NULL, family, &address); | |
661 | if (r < 0) | |
662 | goto clear; | |
663 | } | |
664 | } | |
665 | ||
666 | LIST_FOREACH_SAFE(servers, s, nx, m->dns_servers) | |
667 | if (s->marked) | |
668 | dns_server_free(s); | |
669 | ||
670 | return 0; | |
671 | ||
672 | clear: | |
673 | while (m->dns_servers) | |
674 | dns_server_free(m->dns_servers); | |
675 | ||
676 | return r; | |
677 | } | |
678 | ||
74b2466e LP |
679 | static void write_resolve_conf_server(DnsServer *s, FILE *f, unsigned *count) { |
680 | _cleanup_free_ char *t = NULL; | |
681 | int r; | |
091a364c | 682 | |
74b2466e | 683 | assert(s); |
091a364c | 684 | assert(f); |
091a364c TG |
685 | assert(count); |
686 | ||
74b2466e | 687 | r = in_addr_to_string(s->family, &s->address, &t); |
4e945a6f LP |
688 | if (r < 0) { |
689 | log_warning("Invalid DNS address. Ignoring: %s", strerror(-r)); | |
091a364c TG |
690 | return; |
691 | } | |
692 | ||
693 | if (*count == MAXNS) | |
74b2466e | 694 | fputs("# Too many DNS servers configured, the following entries may be ignored\n", f); |
091a364c | 695 | |
74b2466e | 696 | fprintf(f, "nameserver %s\n", t); |
091a364c TG |
697 | (*count) ++; |
698 | } | |
699 | ||
74b2466e | 700 | int manager_write_resolv_conf(Manager *m) { |
4e945a6f | 701 | static const char path[] = "/run/systemd/resolve/resolv.conf"; |
091a364c TG |
702 | _cleanup_free_ char *temp_path = NULL; |
703 | _cleanup_fclose_ FILE *f = NULL; | |
091a364c | 704 | unsigned count = 0; |
74b2466e LP |
705 | DnsServer *s; |
706 | Iterator i; | |
707 | Link *l; | |
708 | int r; | |
091a364c TG |
709 | |
710 | assert(m); | |
711 | ||
5cb36f41 LP |
712 | /* Read the system /etc/resolv.conf first */ |
713 | manager_read_resolv_conf(m); | |
714 | ||
b686acb2 | 715 | r = fopen_temporary(path, &f, &temp_path); |
091a364c TG |
716 | if (r < 0) |
717 | return r; | |
718 | ||
719 | fchmod(fileno(f), 0644); | |
720 | ||
721 | fputs("# This file is managed by systemd-resolved(8). Do not edit.\n#\n" | |
722 | "# Third party programs must not access this file directly, but\n" | |
723 | "# only through the symlink at /etc/resolv.conf. To manage\n" | |
724 | "# resolv.conf(5) in a different way, replace the symlink by a\n" | |
725 | "# static file or a different symlink.\n\n", f); | |
726 | ||
4e945a6f LP |
727 | LIST_FOREACH(servers, s, m->dns_servers) |
728 | write_resolve_conf_server(s, f, &count); | |
729 | ||
6073b6f2 TG |
730 | HASHMAP_FOREACH(l, m->links, i) |
731 | LIST_FOREACH(servers, s, l->dns_servers) | |
74b2466e | 732 | write_resolve_conf_server(s, f, &count); |
091a364c | 733 | |
4e945a6f LP |
734 | if (count == 0) { |
735 | LIST_FOREACH(servers, s, m->fallback_dns_servers) | |
736 | write_resolve_conf_server(s, f, &count); | |
737 | } | |
091a364c | 738 | |
74b2466e LP |
739 | r = fflush_and_check(f); |
740 | if (r < 0) | |
741 | goto fail; | |
742 | ||
743 | if (rename(temp_path, path) < 0) { | |
744 | r = -errno; | |
745 | goto fail; | |
746 | } | |
091a364c | 747 | |
74b2466e | 748 | return 0; |
091a364c | 749 | |
74b2466e LP |
750 | fail: |
751 | unlink(path); | |
752 | unlink(temp_path); | |
753 | return r; | |
754 | } | |
091a364c | 755 | |
1716f6dc | 756 | int manager_recv(Manager *m, int fd, DnsProtocol protocol, DnsPacket **ret) { |
74b2466e | 757 | _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL; |
1716f6dc LP |
758 | union { |
759 | struct cmsghdr header; /* For alignment */ | |
760 | uint8_t buffer[CMSG_SPACE(MAX(sizeof(struct in_pktinfo), sizeof(struct in6_pktinfo))) | |
761 | + CMSG_SPACE(int) /* ttl/hoplimit */ | |
623a4c97 | 762 | + EXTRA_CMSG_SPACE /* kernel appears to require extra buffer space */]; |
1716f6dc LP |
763 | } control; |
764 | union sockaddr_union sa; | |
74b2466e | 765 | struct msghdr mh = {}; |
1716f6dc | 766 | struct cmsghdr *cmsg; |
74b2466e | 767 | struct iovec iov; |
1716f6dc | 768 | int ms = 0, r; |
74b2466e LP |
769 | ssize_t l; |
770 | ||
771 | assert(m); | |
1716f6dc | 772 | assert(fd >= 0); |
74b2466e LP |
773 | assert(ret); |
774 | ||
74b2466e LP |
775 | r = ioctl(fd, FIONREAD, &ms); |
776 | if (r < 0) | |
777 | return -errno; | |
778 | if (ms < 0) | |
779 | return -EIO; | |
780 | ||
1716f6dc | 781 | r = dns_packet_new(&p, protocol, ms); |
74b2466e LP |
782 | if (r < 0) |
783 | return r; | |
784 | ||
785 | iov.iov_base = DNS_PACKET_DATA(p); | |
786 | iov.iov_len = p->allocated; | |
787 | ||
1716f6dc LP |
788 | mh.msg_name = &sa.sa; |
789 | mh.msg_namelen = sizeof(sa); | |
74b2466e LP |
790 | mh.msg_iov = &iov; |
791 | mh.msg_iovlen = 1; | |
1716f6dc LP |
792 | mh.msg_control = &control; |
793 | mh.msg_controllen = sizeof(control); | |
74b2466e LP |
794 | |
795 | l = recvmsg(fd, &mh, 0); | |
796 | if (l < 0) { | |
ad867662 | 797 | if (errno == EAGAIN || errno == EINTR) |
74b2466e LP |
798 | return 0; |
799 | ||
800 | return -errno; | |
091a364c TG |
801 | } |
802 | ||
74b2466e LP |
803 | if (l <= 0) |
804 | return -EIO; | |
091a364c | 805 | |
1716f6dc LP |
806 | assert(!(mh.msg_flags & MSG_CTRUNC)); |
807 | assert(!(mh.msg_flags & MSG_TRUNC)); | |
808 | ||
74b2466e | 809 | p->size = (size_t) l; |
091a364c | 810 | |
1716f6dc | 811 | p->family = sa.sa.sa_family; |
623a4c97 LP |
812 | p->ipproto = IPPROTO_UDP; |
813 | if (p->family == AF_INET) { | |
1716f6dc | 814 | p->sender.in = sa.in.sin_addr; |
623a4c97 LP |
815 | p->sender_port = be16toh(sa.in.sin_port); |
816 | } else if (p->family == AF_INET6) { | |
1716f6dc | 817 | p->sender.in6 = sa.in6.sin6_addr; |
623a4c97 LP |
818 | p->sender_port = be16toh(sa.in6.sin6_port); |
819 | p->ifindex = sa.in6.sin6_scope_id; | |
820 | } else | |
1716f6dc | 821 | return -EAFNOSUPPORT; |
74b2466e | 822 | |
1716f6dc | 823 | for (cmsg = CMSG_FIRSTHDR(&mh); cmsg; cmsg = CMSG_NXTHDR(&mh, cmsg)) { |
74b2466e | 824 | |
1716f6dc LP |
825 | if (cmsg->cmsg_level == IPPROTO_IPV6) { |
826 | assert(p->family == AF_INET6); | |
74b2466e | 827 | |
1716f6dc | 828 | switch (cmsg->cmsg_type) { |
74b2466e | 829 | |
1716f6dc LP |
830 | case IPV6_PKTINFO: { |
831 | struct in6_pktinfo *i = (struct in6_pktinfo*) CMSG_DATA(cmsg); | |
74b2466e | 832 | |
623a4c97 LP |
833 | if (p->ifindex <= 0) |
834 | p->ifindex = i->ipi6_ifindex; | |
835 | ||
1716f6dc LP |
836 | p->destination.in6 = i->ipi6_addr; |
837 | break; | |
838 | } | |
74b2466e | 839 | |
1716f6dc LP |
840 | case IPV6_HOPLIMIT: |
841 | p->ttl = *(int *) CMSG_DATA(cmsg); | |
842 | break; | |
74b2466e | 843 | |
1716f6dc LP |
844 | } |
845 | } else if (cmsg->cmsg_level == IPPROTO_IP) { | |
846 | assert(p->family == AF_INET); | |
74b2466e | 847 | |
1716f6dc | 848 | switch (cmsg->cmsg_type) { |
74b2466e | 849 | |
1716f6dc LP |
850 | case IP_PKTINFO: { |
851 | struct in_pktinfo *i = (struct in_pktinfo*) CMSG_DATA(cmsg); | |
091a364c | 852 | |
623a4c97 LP |
853 | if (p->ifindex <= 0) |
854 | p->ifindex = i->ipi_ifindex; | |
855 | ||
1716f6dc LP |
856 | p->destination.in = i->ipi_addr; |
857 | break; | |
858 | } | |
74b2466e | 859 | |
623a4c97 | 860 | case IP_TTL: |
1716f6dc LP |
861 | p->ttl = *(int *) CMSG_DATA(cmsg); |
862 | break; | |
863 | } | |
864 | } | |
865 | } | |
74b2466e | 866 | |
623a4c97 LP |
867 | /* The Linux kernel sets the interface index to the loopback |
868 | * device if the packet came from the local host since it | |
869 | * avoids the routing table in such a case. Let's unset the | |
870 | * interface index in such a case. */ | |
871 | if (p->ifindex > 0 && manager_ifindex_is_loopback(m, p->ifindex) != 0) | |
872 | p->ifindex = 0; | |
873 | ||
874 | /* If we don't know the interface index still, we look for the | |
875 | * first local interface with a matching address. Yuck! */ | |
876 | if (p->ifindex <= 0) | |
877 | p->ifindex = manager_find_ifindex(m, p->family, &p->destination); | |
878 | ||
74b2466e LP |
879 | *ret = p; |
880 | p = NULL; | |
881 | ||
882 | return 1; | |
883 | } | |
884 | ||
1716f6dc | 885 | static int on_dns_packet(sd_event_source *s, int fd, uint32_t revents, void *userdata) { |
74b2466e | 886 | _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL; |
ec2c5e43 | 887 | DnsTransaction *t = NULL; |
74b2466e LP |
888 | Manager *m = userdata; |
889 | int r; | |
890 | ||
1716f6dc | 891 | r = manager_recv(m, fd, DNS_PROTOCOL_DNS, &p); |
74b2466e LP |
892 | if (r <= 0) |
893 | return r; | |
894 | ||
623a4c97 | 895 | if (dns_packet_validate_reply(p) > 0) { |
ec2c5e43 | 896 | t = hashmap_get(m->dns_transactions, UINT_TO_PTR(DNS_PACKET_ID(p))); |
1716f6dc LP |
897 | if (!t) |
898 | return 0; | |
74b2466e | 899 | |
ec2c5e43 | 900 | dns_transaction_process_reply(t, p); |
623a4c97 | 901 | |
1716f6dc | 902 | } else |
623a4c97 | 903 | log_debug("Invalid DNS packet."); |
74b2466e | 904 | |
ad867662 | 905 | return 0; |
74b2466e LP |
906 | } |
907 | ||
908 | int manager_dns_ipv4_fd(Manager *m) { | |
1716f6dc | 909 | const int one = 1; |
74b2466e LP |
910 | int r; |
911 | ||
091a364c TG |
912 | assert(m); |
913 | ||
74b2466e LP |
914 | if (m->dns_ipv4_fd >= 0) |
915 | return m->dns_ipv4_fd; | |
091a364c | 916 | |
74b2466e LP |
917 | m->dns_ipv4_fd = socket(AF_INET, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); |
918 | if (m->dns_ipv4_fd < 0) | |
919 | return -errno; | |
091a364c | 920 | |
1716f6dc LP |
921 | r = setsockopt(m->dns_ipv4_fd, IPPROTO_IP, IP_PKTINFO, &one, sizeof(one)); |
922 | if (r < 0) { | |
923 | r = -errno; | |
924 | goto fail; | |
925 | } | |
926 | ||
927 | r = sd_event_add_io(m->event, &m->dns_ipv4_event_source, m->dns_ipv4_fd, EPOLLIN, on_dns_packet, m); | |
74b2466e | 928 | if (r < 0) |
1716f6dc | 929 | goto fail; |
74b2466e LP |
930 | |
931 | return m->dns_ipv4_fd; | |
1716f6dc LP |
932 | |
933 | fail: | |
934 | m->dns_ipv4_fd = safe_close(m->dns_ipv4_fd); | |
935 | return r; | |
091a364c TG |
936 | } |
937 | ||
74b2466e | 938 | int manager_dns_ipv6_fd(Manager *m) { |
1716f6dc | 939 | const int one = 1; |
74b2466e LP |
940 | int r; |
941 | ||
942 | assert(m); | |
091a364c | 943 | |
74b2466e LP |
944 | if (m->dns_ipv6_fd >= 0) |
945 | return m->dns_ipv6_fd; | |
946 | ||
947 | m->dns_ipv6_fd = socket(AF_INET6, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); | |
948 | if (m->dns_ipv6_fd < 0) | |
949 | return -errno; | |
950 | ||
1716f6dc LP |
951 | r = setsockopt(m->dns_ipv6_fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, &one, sizeof(one)); |
952 | if (r < 0) { | |
953 | r = -errno; | |
954 | goto fail; | |
955 | } | |
956 | ||
957 | r = sd_event_add_io(m->event, &m->dns_ipv6_event_source, m->dns_ipv6_fd, EPOLLIN, on_dns_packet, m); | |
091a364c | 958 | if (r < 0) |
1716f6dc | 959 | goto fail; |
091a364c | 960 | |
74b2466e | 961 | return m->dns_ipv6_fd; |
1716f6dc LP |
962 | |
963 | fail: | |
964 | m->dns_ipv6_fd = safe_close(m->dns_ipv6_fd); | |
965 | return r; | |
74b2466e LP |
966 | } |
967 | ||
968 | static int sendmsg_loop(int fd, struct msghdr *mh, int flags) { | |
969 | int r; | |
970 | ||
971 | assert(fd >= 0); | |
972 | assert(mh); | |
973 | ||
974 | for (;;) { | |
975 | if (sendmsg(fd, mh, flags) >= 0) | |
976 | return 0; | |
977 | ||
978 | if (errno == EINTR) | |
979 | continue; | |
980 | ||
981 | if (errno != EAGAIN) | |
982 | return -errno; | |
983 | ||
984 | r = fd_wait_for_event(fd, POLLOUT, SEND_TIMEOUT_USEC); | |
985 | if (r < 0) | |
986 | return r; | |
987 | if (r == 0) | |
988 | return -ETIMEDOUT; | |
989 | } | |
990 | } | |
991 | ||
623a4c97 | 992 | static int manager_ipv4_send(Manager *m, int fd, int ifindex, const struct in_addr *addr, uint16_t port, DnsPacket *p) { |
74b2466e LP |
993 | union sockaddr_union sa = { |
994 | .in.sin_family = AF_INET, | |
74b2466e | 995 | }; |
1716f6dc LP |
996 | union { |
997 | struct cmsghdr header; /* For alignment */ | |
998 | uint8_t buffer[CMSG_SPACE(sizeof(struct in_pktinfo))]; | |
999 | } control; | |
74b2466e LP |
1000 | struct msghdr mh = {}; |
1001 | struct iovec iov; | |
74b2466e LP |
1002 | |
1003 | assert(m); | |
1716f6dc LP |
1004 | assert(fd >= 0); |
1005 | assert(addr); | |
1006 | assert(port > 0); | |
74b2466e LP |
1007 | assert(p); |
1008 | ||
74b2466e LP |
1009 | iov.iov_base = DNS_PACKET_DATA(p); |
1010 | iov.iov_len = p->size; | |
091a364c | 1011 | |
1716f6dc LP |
1012 | sa.in.sin_addr = *addr; |
1013 | sa.in.sin_port = htobe16(port), | |
091a364c | 1014 | |
74b2466e LP |
1015 | mh.msg_iov = &iov; |
1016 | mh.msg_iovlen = 1; | |
1017 | mh.msg_name = &sa.sa; | |
1018 | mh.msg_namelen = sizeof(sa.in); | |
091a364c | 1019 | |
74b2466e LP |
1020 | if (ifindex > 0) { |
1021 | struct cmsghdr *cmsg; | |
1022 | struct in_pktinfo *pi; | |
1023 | ||
1024 | zero(control); | |
1025 | ||
1716f6dc | 1026 | mh.msg_control = &control; |
74b2466e LP |
1027 | mh.msg_controllen = CMSG_LEN(sizeof(struct in_pktinfo)); |
1028 | ||
1029 | cmsg = CMSG_FIRSTHDR(&mh); | |
1030 | cmsg->cmsg_len = mh.msg_controllen; | |
1031 | cmsg->cmsg_level = IPPROTO_IP; | |
1032 | cmsg->cmsg_type = IP_PKTINFO; | |
1033 | ||
1034 | pi = (struct in_pktinfo*) CMSG_DATA(cmsg); | |
1035 | pi->ipi_ifindex = ifindex; | |
1036 | } | |
1037 | ||
1038 | return sendmsg_loop(fd, &mh, 0); | |
1039 | } | |
1040 | ||
623a4c97 | 1041 | static int manager_ipv6_send(Manager *m, int fd, int ifindex, const struct in6_addr *addr, uint16_t port, DnsPacket *p) { |
74b2466e LP |
1042 | union sockaddr_union sa = { |
1043 | .in6.sin6_family = AF_INET6, | |
74b2466e | 1044 | }; |
1716f6dc LP |
1045 | union { |
1046 | struct cmsghdr header; /* For alignment */ | |
1047 | uint8_t buffer[CMSG_SPACE(sizeof(struct in6_pktinfo))]; | |
1048 | } control; | |
74b2466e LP |
1049 | struct msghdr mh = {}; |
1050 | struct iovec iov; | |
74b2466e LP |
1051 | |
1052 | assert(m); | |
1716f6dc LP |
1053 | assert(fd >= 0); |
1054 | assert(addr); | |
1055 | assert(port > 0); | |
74b2466e LP |
1056 | assert(p); |
1057 | ||
74b2466e LP |
1058 | iov.iov_base = DNS_PACKET_DATA(p); |
1059 | iov.iov_len = p->size; | |
1060 | ||
1716f6dc LP |
1061 | sa.in6.sin6_addr = *addr; |
1062 | sa.in6.sin6_port = htobe16(port), | |
74b2466e LP |
1063 | sa.in6.sin6_scope_id = ifindex; |
1064 | ||
1065 | mh.msg_iov = &iov; | |
1066 | mh.msg_iovlen = 1; | |
1067 | mh.msg_name = &sa.sa; | |
1068 | mh.msg_namelen = sizeof(sa.in6); | |
1069 | ||
1070 | if (ifindex > 0) { | |
1071 | struct cmsghdr *cmsg; | |
1072 | struct in6_pktinfo *pi; | |
1073 | ||
1074 | zero(control); | |
1075 | ||
1716f6dc | 1076 | mh.msg_control = &control; |
74b2466e LP |
1077 | mh.msg_controllen = CMSG_LEN(sizeof(struct in6_pktinfo)); |
1078 | ||
1079 | cmsg = CMSG_FIRSTHDR(&mh); | |
1080 | cmsg->cmsg_len = mh.msg_controllen; | |
1081 | cmsg->cmsg_level = IPPROTO_IPV6; | |
1082 | cmsg->cmsg_type = IPV6_PKTINFO; | |
1083 | ||
1084 | pi = (struct in6_pktinfo*) CMSG_DATA(cmsg); | |
1085 | pi->ipi6_ifindex = ifindex; | |
1086 | } | |
1087 | ||
1088 | return sendmsg_loop(fd, &mh, 0); | |
1089 | } | |
1090 | ||
623a4c97 | 1091 | int manager_send(Manager *m, int fd, int ifindex, int family, const union in_addr_union *addr, uint16_t port, DnsPacket *p) { |
1716f6dc LP |
1092 | assert(m); |
1093 | assert(fd >= 0); | |
1094 | assert(addr); | |
1095 | assert(port > 0); | |
1096 | assert(p); | |
1097 | ||
a2a416f7 LP |
1098 | log_debug("Sending %s packet with id %u on interface %i/%s", DNS_PACKET_QR(p) ? "response" : "query", DNS_PACKET_ID(p), ifindex, af_to_name(family)); |
1099 | ||
1716f6dc LP |
1100 | if (family == AF_INET) |
1101 | return manager_ipv4_send(m, fd, ifindex, &addr->in, port, p); | |
1102 | else if (family == AF_INET6) | |
1103 | return manager_ipv6_send(m, fd, ifindex, &addr->in6, port, p); | |
1104 | ||
1105 | return -EAFNOSUPPORT; | |
1106 | } | |
1107 | ||
2c27fbca | 1108 | DnsServer* manager_find_dns_server(Manager *m, int family, const union in_addr_union *in_addr) { |
74b2466e LP |
1109 | DnsServer *s; |
1110 | ||
1111 | assert(m); | |
1112 | assert(in_addr); | |
1113 | ||
4e945a6f | 1114 | LIST_FOREACH(servers, s, m->dns_servers) |
5cb36f41 | 1115 | if (s->family == family && in_addr_equal(family, &s->address, in_addr) > 0) |
2c27fbca | 1116 | return s; |
74b2466e | 1117 | |
4e945a6f | 1118 | LIST_FOREACH(servers, s, m->fallback_dns_servers) |
5cb36f41 | 1119 | if (s->family == family && in_addr_equal(family, &s->address, in_addr) > 0) |
2c27fbca | 1120 | return s; |
74b2466e | 1121 | |
2c27fbca | 1122 | return NULL; |
4e945a6f LP |
1123 | } |
1124 | ||
2c27fbca | 1125 | DnsServer *manager_set_dns_server(Manager *m, DnsServer *s) { |
4e945a6f LP |
1126 | assert(m); |
1127 | ||
1128 | if (m->current_dns_server == s) | |
1129 | return s; | |
1130 | ||
1131 | if (s) { | |
1132 | _cleanup_free_ char *ip = NULL; | |
1133 | ||
1134 | in_addr_to_string(s->family, &s->address, &ip); | |
1135 | log_info("Switching to system DNS server %s.", strna(ip)); | |
2c27fbca | 1136 | } |
4e945a6f LP |
1137 | |
1138 | m->current_dns_server = s; | |
2c27fbca LP |
1139 | |
1140 | if (m->unicast_scope) | |
1141 | dns_cache_flush(&m->unicast_scope->cache); | |
1142 | ||
4e945a6f | 1143 | return s; |
74b2466e LP |
1144 | } |
1145 | ||
1146 | DnsServer *manager_get_dns_server(Manager *m) { | |
4e945a6f | 1147 | Link *l; |
74b2466e LP |
1148 | assert(m); |
1149 | ||
5cb36f41 LP |
1150 | /* Try to read updates resolv.conf */ |
1151 | manager_read_resolv_conf(m); | |
1152 | ||
74b2466e | 1153 | if (!m->current_dns_server) |
4e945a6f LP |
1154 | manager_set_dns_server(m, m->dns_servers); |
1155 | ||
1156 | if (!m->current_dns_server) { | |
1157 | bool found = false; | |
1158 | Iterator i; | |
1159 | ||
1160 | /* No DNS servers configured, let's see if there are | |
1161 | * any on any links. If not, we use the fallback | |
1162 | * servers */ | |
1163 | ||
1164 | HASHMAP_FOREACH(l, m->links, i) | |
1165 | if (l->dns_servers) { | |
1166 | found = true; | |
1167 | break; | |
1168 | } | |
1169 | ||
1170 | if (!found) | |
1171 | manager_set_dns_server(m, m->fallback_dns_servers); | |
1172 | } | |
74b2466e LP |
1173 | |
1174 | return m->current_dns_server; | |
1175 | } | |
1176 | ||
1177 | void manager_next_dns_server(Manager *m) { | |
1178 | assert(m); | |
1179 | ||
4e945a6f LP |
1180 | /* If there's currently no DNS server set, then the next |
1181 | * manager_get_dns_server() will find one */ | |
74b2466e LP |
1182 | if (!m->current_dns_server) |
1183 | return; | |
1184 | ||
4e945a6f | 1185 | /* Change to the next one */ |
74b2466e | 1186 | if (m->current_dns_server->servers_next) { |
4e945a6f | 1187 | manager_set_dns_server(m, m->current_dns_server->servers_next); |
74b2466e LP |
1188 | return; |
1189 | } | |
1190 | ||
4e945a6f LP |
1191 | /* If there was no next one, then start from the beginning of |
1192 | * the list */ | |
1193 | if (m->current_dns_server->type == DNS_SERVER_FALLBACK) | |
1194 | manager_set_dns_server(m, m->fallback_dns_servers); | |
1195 | else | |
1196 | manager_set_dns_server(m, m->dns_servers); | |
091a364c | 1197 | } |
e1c95994 LP |
1198 | |
1199 | uint32_t manager_find_mtu(Manager *m) { | |
1200 | uint32_t mtu = 0; | |
1201 | Link *l; | |
1202 | Iterator i; | |
1203 | ||
1204 | /* If we don't know on which link a DNS packet would be | |
1205 | * delivered, let's find the largest MTU that works on all | |
1206 | * interfaces we know of */ | |
1207 | ||
1208 | HASHMAP_FOREACH(l, m->links, i) { | |
1209 | if (l->mtu <= 0) | |
1210 | continue; | |
1211 | ||
1212 | if (mtu <= 0 || l->mtu < mtu) | |
1213 | mtu = l->mtu; | |
1214 | } | |
1215 | ||
1216 | return mtu; | |
1217 | } | |
1716f6dc LP |
1218 | |
1219 | static int on_llmnr_packet(sd_event_source *s, int fd, uint32_t revents, void *userdata) { | |
1220 | _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL; | |
ec2c5e43 | 1221 | DnsTransaction *t = NULL; |
1716f6dc | 1222 | Manager *m = userdata; |
a4076574 | 1223 | DnsScope *scope; |
1716f6dc LP |
1224 | int r; |
1225 | ||
1226 | r = manager_recv(m, fd, DNS_PROTOCOL_LLMNR, &p); | |
1227 | if (r <= 0) | |
1228 | return r; | |
1229 | ||
a4076574 LP |
1230 | scope = manager_find_scope(m, p); |
1231 | if (!scope) { | |
1232 | log_warning("Got LLMNR UDP packet on unknown scope. Ignoring."); | |
1233 | return 0; | |
1234 | } | |
1235 | ||
623a4c97 | 1236 | if (dns_packet_validate_reply(p) > 0) { |
a2a416f7 LP |
1237 | log_debug("Got reply packet for id %u", DNS_PACKET_ID(p)); |
1238 | ||
a4076574 | 1239 | dns_scope_check_conflicts(scope, p); |
623a4c97 | 1240 | |
a4076574 LP |
1241 | t = hashmap_get(m->dns_transactions, UINT_TO_PTR(DNS_PACKET_ID(p))); |
1242 | if (t) | |
1243 | dns_transaction_process_reply(t, p); | |
623a4c97 | 1244 | |
a4076574 LP |
1245 | } else if (dns_packet_validate_query(p) > 0) { |
1246 | log_debug("Got query packet for id %u", DNS_PACKET_ID(p)); | |
623a4c97 | 1247 | |
a4076574 | 1248 | dns_scope_process_query(scope, NULL, p); |
623a4c97 | 1249 | } else |
a4076574 | 1250 | log_debug("Invalid LLMNR UDP packet."); |
1716f6dc LP |
1251 | |
1252 | return 0; | |
1253 | } | |
1254 | ||
1255 | int manager_llmnr_ipv4_udp_fd(Manager *m) { | |
1256 | union sockaddr_union sa = { | |
1257 | .in.sin_family = AF_INET, | |
1258 | .in.sin_port = htobe16(5355), | |
1259 | }; | |
bf3f1271 | 1260 | static const int one = 1, pmtu = IP_PMTUDISC_DONT, ttl = 255; |
1716f6dc LP |
1261 | int r; |
1262 | ||
1263 | assert(m); | |
1264 | ||
1265 | if (m->llmnr_ipv4_udp_fd >= 0) | |
1266 | return m->llmnr_ipv4_udp_fd; | |
1267 | ||
1268 | m->llmnr_ipv4_udp_fd = socket(AF_INET, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); | |
1269 | if (m->llmnr_ipv4_udp_fd < 0) | |
1270 | return -errno; | |
1271 | ||
bf3f1271 LP |
1272 | /* RFC 4795, section 2.5 recommends setting the TTL of UDP packets to 255. */ |
1273 | r = setsockopt(m->llmnr_ipv4_udp_fd, IPPROTO_IP, IP_TTL, &ttl, sizeof(ttl)); | |
1716f6dc LP |
1274 | if (r < 0) { |
1275 | r = -errno; | |
1276 | goto fail; | |
1277 | } | |
1278 | ||
bf3f1271 | 1279 | r = setsockopt(m->llmnr_ipv4_udp_fd, IPPROTO_IP, IP_MULTICAST_TTL, &ttl, sizeof(ttl)); |
1716f6dc LP |
1280 | if (r < 0) { |
1281 | r = -errno; | |
1282 | goto fail; | |
1283 | } | |
1284 | ||
1285 | r = setsockopt(m->llmnr_ipv4_udp_fd, IPPROTO_IP, IP_MULTICAST_LOOP, &one, sizeof(one)); | |
1286 | if (r < 0) { | |
1287 | r = -errno; | |
1288 | goto fail; | |
1289 | } | |
1290 | ||
1291 | r = setsockopt(m->llmnr_ipv4_udp_fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)); | |
1292 | if (r < 0) { | |
1293 | r = -errno; | |
1294 | goto fail; | |
1295 | } | |
1296 | ||
1297 | r = setsockopt(m->llmnr_ipv4_udp_fd, IPPROTO_IP, IP_PKTINFO, &one, sizeof(one)); | |
1298 | if (r < 0) { | |
1299 | r = -errno; | |
1300 | goto fail; | |
1301 | } | |
1302 | ||
1303 | r = setsockopt(m->llmnr_ipv4_udp_fd, IPPROTO_IP, IP_RECVTTL, &one, sizeof(one)); | |
1304 | if (r < 0) { | |
1305 | r = -errno; | |
1306 | goto fail; | |
1307 | } | |
1308 | ||
1309 | /* Disable Don't-Fragment bit in the IP header */ | |
1310 | r = setsockopt(m->llmnr_ipv4_udp_fd, IPPROTO_IP, IP_MTU_DISCOVER, &pmtu, sizeof(pmtu)); | |
1311 | if (r < 0) { | |
1312 | r = -errno; | |
1313 | goto fail; | |
1314 | } | |
1315 | ||
1316 | r = bind(m->llmnr_ipv4_udp_fd, &sa.sa, sizeof(sa.in)); | |
1317 | if (r < 0) { | |
1318 | r = -errno; | |
1319 | goto fail; | |
1320 | } | |
1321 | ||
1322 | r = sd_event_add_io(m->event, &m->llmnr_ipv4_udp_event_source, m->llmnr_ipv4_udp_fd, EPOLLIN, on_llmnr_packet, m); | |
1323 | if (r < 0) | |
1324 | goto fail; | |
1325 | ||
1326 | return m->llmnr_ipv4_udp_fd; | |
1327 | ||
1328 | fail: | |
1329 | m->llmnr_ipv4_udp_fd = safe_close(m->llmnr_ipv4_udp_fd); | |
1330 | return r; | |
1331 | } | |
1332 | ||
1333 | int manager_llmnr_ipv6_udp_fd(Manager *m) { | |
1334 | union sockaddr_union sa = { | |
1335 | .in6.sin6_family = AF_INET6, | |
1336 | .in6.sin6_port = htobe16(5355), | |
1337 | }; | |
bf3f1271 | 1338 | static const int one = 1, ttl = 255; |
1716f6dc LP |
1339 | int r; |
1340 | ||
1341 | assert(m); | |
1342 | ||
1343 | if (m->llmnr_ipv6_udp_fd >= 0) | |
1344 | return m->llmnr_ipv6_udp_fd; | |
1345 | ||
1346 | m->llmnr_ipv6_udp_fd = socket(AF_INET6, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); | |
1347 | if (m->llmnr_ipv6_udp_fd < 0) | |
1348 | return -errno; | |
1349 | ||
bf3f1271 | 1350 | r = setsockopt(m->llmnr_ipv6_udp_fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &ttl, sizeof(ttl)); |
1716f6dc LP |
1351 | if (r < 0) { |
1352 | r = -errno; | |
1353 | goto fail; | |
1354 | } | |
1355 | ||
bf3f1271 LP |
1356 | /* RFC 4795, section 2.5 recommends setting the TTL of UDP packets to 255. */ |
1357 | r = setsockopt(m->llmnr_ipv6_udp_fd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &ttl, sizeof(ttl)); | |
1716f6dc LP |
1358 | if (r < 0) { |
1359 | r = -errno; | |
1360 | goto fail; | |
1361 | } | |
1362 | ||
1363 | r = setsockopt(m->llmnr_ipv6_udp_fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &one, sizeof(one)); | |
1364 | if (r < 0) { | |
1365 | r = -errno; | |
1366 | goto fail; | |
1367 | } | |
1368 | ||
1369 | r = setsockopt(m->llmnr_ipv6_udp_fd, IPPROTO_IPV6, IPV6_V6ONLY, &one, sizeof(one)); | |
1370 | if (r < 0) { | |
1371 | r = -errno; | |
1372 | goto fail; | |
1373 | } | |
1374 | ||
1375 | r = setsockopt(m->llmnr_ipv6_udp_fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)); | |
1376 | if (r < 0) { | |
1377 | r = -errno; | |
1378 | goto fail; | |
1379 | } | |
1380 | ||
1381 | r = setsockopt(m->llmnr_ipv6_udp_fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, &one, sizeof(one)); | |
1382 | if (r < 0) { | |
1383 | r = -errno; | |
1384 | goto fail; | |
1385 | } | |
1386 | ||
1387 | r = setsockopt(m->llmnr_ipv6_udp_fd, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &one, sizeof(one)); | |
1388 | if (r < 0) { | |
1389 | r = -errno; | |
1390 | goto fail; | |
1391 | } | |
1392 | ||
1393 | r = bind(m->llmnr_ipv6_udp_fd, &sa.sa, sizeof(sa.in6)); | |
1394 | if (r < 0) { | |
1395 | r = -errno; | |
1396 | goto fail; | |
1397 | } | |
1398 | ||
1399 | r = sd_event_add_io(m->event, &m->llmnr_ipv6_udp_event_source, m->llmnr_ipv6_udp_fd, EPOLLIN, on_llmnr_packet, m); | |
1400 | if (r < 0) { | |
1401 | r = -errno; | |
1402 | goto fail; | |
1403 | } | |
1404 | ||
1405 | return m->llmnr_ipv6_udp_fd; | |
1406 | ||
1407 | fail: | |
1408 | m->llmnr_ipv6_udp_fd = safe_close(m->llmnr_ipv6_udp_fd); | |
1409 | return r; | |
1410 | } | |
623a4c97 LP |
1411 | |
1412 | static int on_llmnr_stream_packet(DnsStream *s) { | |
a4076574 | 1413 | DnsScope *scope; |
623a4c97 | 1414 | |
a4076574 | 1415 | assert(s); |
623a4c97 | 1416 | |
a4076574 LP |
1417 | scope = manager_find_scope(s->manager, s->read_packet); |
1418 | if (!scope) { | |
1419 | log_warning("Got LLMNR TCP packet on unknown scope. Ignroing."); | |
1420 | return 0; | |
1421 | } | |
623a4c97 | 1422 | |
a4076574 LP |
1423 | if (dns_packet_validate_query(s->read_packet) > 0) { |
1424 | log_debug("Got query packet for id %u", DNS_PACKET_ID(s->read_packet)); | |
623a4c97 | 1425 | |
a4076574 | 1426 | dns_scope_process_query(scope, s, s->read_packet); |
623a4c97 | 1427 | |
a4076574 LP |
1428 | /* If no reply packet was set, we free the stream */ |
1429 | if (s->write_packet) | |
1430 | return 0; | |
1431 | } else | |
1432 | log_debug("Invalid LLMNR TCP packet."); | |
623a4c97 LP |
1433 | |
1434 | dns_stream_free(s); | |
1435 | return 0; | |
1436 | } | |
1437 | ||
1438 | static int on_llmnr_stream(sd_event_source *s, int fd, uint32_t revents, void *userdata) { | |
1439 | DnsStream *stream; | |
1440 | Manager *m = userdata; | |
1441 | int cfd, r; | |
1442 | ||
1443 | cfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC); | |
1444 | if (cfd < 0) { | |
1445 | if (errno == EAGAIN || errno == EINTR) | |
1446 | return 0; | |
1447 | ||
1448 | return -errno; | |
1449 | } | |
1450 | ||
1451 | r = dns_stream_new(m, &stream, DNS_PROTOCOL_LLMNR, cfd); | |
1452 | if (r < 0) { | |
1453 | safe_close(cfd); | |
1454 | return r; | |
1455 | } | |
1456 | ||
1457 | stream->on_packet = on_llmnr_stream_packet; | |
1458 | return 0; | |
1459 | } | |
1460 | ||
1461 | int manager_llmnr_ipv4_tcp_fd(Manager *m) { | |
1462 | union sockaddr_union sa = { | |
1463 | .in.sin_family = AF_INET, | |
1464 | .in.sin_port = htobe16(5355), | |
1465 | }; | |
1466 | static const int one = 1, pmtu = IP_PMTUDISC_DONT; | |
1467 | int r; | |
1468 | ||
1469 | assert(m); | |
1470 | ||
1471 | if (m->llmnr_ipv4_tcp_fd >= 0) | |
1472 | return m->llmnr_ipv4_tcp_fd; | |
1473 | ||
1474 | m->llmnr_ipv4_tcp_fd = socket(AF_INET, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); | |
1475 | if (m->llmnr_ipv4_tcp_fd < 0) | |
1476 | return -errno; | |
1477 | ||
bf3f1271 | 1478 | /* RFC 4795, section 2.5. requires setting the TTL of TCP streams to 1 */ |
623a4c97 LP |
1479 | r = setsockopt(m->llmnr_ipv4_tcp_fd, IPPROTO_IP, IP_TTL, &one, sizeof(one)); |
1480 | if (r < 0) { | |
1481 | r = -errno; | |
1482 | goto fail; | |
1483 | } | |
1484 | ||
1485 | r = setsockopt(m->llmnr_ipv4_tcp_fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)); | |
1486 | if (r < 0) { | |
1487 | r = -errno; | |
1488 | goto fail; | |
1489 | } | |
1490 | ||
1491 | r = setsockopt(m->llmnr_ipv4_tcp_fd, IPPROTO_IP, IP_PKTINFO, &one, sizeof(one)); | |
1492 | if (r < 0) { | |
1493 | r = -errno; | |
1494 | goto fail; | |
1495 | } | |
1496 | ||
1497 | r = setsockopt(m->llmnr_ipv4_tcp_fd, IPPROTO_IP, IP_RECVTTL, &one, sizeof(one)); | |
1498 | if (r < 0) { | |
1499 | r = -errno; | |
1500 | goto fail; | |
1501 | } | |
1502 | ||
1503 | /* Disable Don't-Fragment bit in the IP header */ | |
1504 | r = setsockopt(m->llmnr_ipv4_tcp_fd, IPPROTO_IP, IP_MTU_DISCOVER, &pmtu, sizeof(pmtu)); | |
1505 | if (r < 0) { | |
1506 | r = -errno; | |
1507 | goto fail; | |
1508 | } | |
1509 | ||
1510 | r = bind(m->llmnr_ipv4_tcp_fd, &sa.sa, sizeof(sa.in)); | |
1511 | if (r < 0) { | |
1512 | r = -errno; | |
1513 | goto fail; | |
1514 | } | |
1515 | ||
1516 | r = listen(m->llmnr_ipv4_tcp_fd, SOMAXCONN); | |
1517 | if (r < 0) { | |
1518 | r = -errno; | |
1519 | goto fail; | |
1520 | } | |
1521 | ||
1522 | r = sd_event_add_io(m->event, &m->llmnr_ipv4_tcp_event_source, m->llmnr_ipv4_tcp_fd, EPOLLIN, on_llmnr_stream, m); | |
1523 | if (r < 0) | |
1524 | goto fail; | |
1525 | ||
1526 | return m->llmnr_ipv4_tcp_fd; | |
1527 | ||
1528 | fail: | |
1529 | m->llmnr_ipv4_tcp_fd = safe_close(m->llmnr_ipv4_tcp_fd); | |
1530 | return r; | |
1531 | } | |
1532 | ||
1533 | int manager_llmnr_ipv6_tcp_fd(Manager *m) { | |
1534 | union sockaddr_union sa = { | |
1535 | .in6.sin6_family = AF_INET6, | |
1536 | .in6.sin6_port = htobe16(5355), | |
1537 | }; | |
1538 | static const int one = 1; | |
1539 | int r; | |
1540 | ||
1541 | assert(m); | |
1542 | ||
1543 | if (m->llmnr_ipv6_tcp_fd >= 0) | |
1544 | return m->llmnr_ipv6_tcp_fd; | |
1545 | ||
1546 | m->llmnr_ipv6_tcp_fd = socket(AF_INET6, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); | |
1547 | if (m->llmnr_ipv6_tcp_fd < 0) | |
1548 | return -errno; | |
1549 | ||
bf3f1271 | 1550 | /* RFC 4795, section 2.5. requires setting the TTL of TCP streams to 1 */ |
623a4c97 LP |
1551 | r = setsockopt(m->llmnr_ipv6_tcp_fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &one, sizeof(one)); |
1552 | if (r < 0) { | |
1553 | r = -errno; | |
1554 | goto fail; | |
1555 | } | |
1556 | ||
1557 | r = setsockopt(m->llmnr_ipv6_tcp_fd, IPPROTO_IPV6, IPV6_V6ONLY, &one, sizeof(one)); | |
1558 | if (r < 0) { | |
1559 | r = -errno; | |
1560 | goto fail; | |
1561 | } | |
1562 | ||
1563 | r = setsockopt(m->llmnr_ipv6_tcp_fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)); | |
1564 | if (r < 0) { | |
1565 | r = -errno; | |
1566 | goto fail; | |
1567 | } | |
1568 | ||
1569 | r = setsockopt(m->llmnr_ipv6_tcp_fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, &one, sizeof(one)); | |
1570 | if (r < 0) { | |
1571 | r = -errno; | |
1572 | goto fail; | |
1573 | } | |
1574 | ||
1575 | r = setsockopt(m->llmnr_ipv6_tcp_fd, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &one, sizeof(one)); | |
1576 | if (r < 0) { | |
1577 | r = -errno; | |
1578 | goto fail; | |
1579 | } | |
1580 | ||
1581 | r = bind(m->llmnr_ipv6_tcp_fd, &sa.sa, sizeof(sa.in6)); | |
1582 | if (r < 0) { | |
1583 | r = -errno; | |
1584 | goto fail; | |
1585 | } | |
1586 | ||
1587 | r = listen(m->llmnr_ipv6_tcp_fd, SOMAXCONN); | |
1588 | if (r < 0) { | |
1589 | r = -errno; | |
1590 | goto fail; | |
1591 | } | |
1592 | ||
1593 | r = sd_event_add_io(m->event, &m->llmnr_ipv6_tcp_event_source, m->llmnr_ipv6_tcp_fd, EPOLLIN, on_llmnr_stream, m); | |
1594 | if (r < 0) { | |
1595 | r = -errno; | |
1596 | goto fail; | |
1597 | } | |
1598 | ||
1599 | return m->llmnr_ipv6_tcp_fd; | |
1600 | ||
1601 | fail: | |
1602 | m->llmnr_ipv6_tcp_fd = safe_close(m->llmnr_ipv6_tcp_fd); | |
1603 | return r; | |
1604 | } | |
1605 | ||
1606 | int manager_ifindex_is_loopback(Manager *m, int ifindex) { | |
1607 | Link *l; | |
1608 | assert(m); | |
1609 | ||
1610 | if (ifindex <= 0) | |
1611 | return -EINVAL; | |
1612 | ||
1613 | l = hashmap_get(m->links, INT_TO_PTR(ifindex)); | |
1614 | if (l->flags & IFF_LOOPBACK) | |
1615 | return 1; | |
1616 | ||
1617 | return 0; | |
1618 | } | |
1619 | ||
1620 | int manager_find_ifindex(Manager *m, int family, const union in_addr_union *in_addr) { | |
ec2c5e43 LP |
1621 | LinkAddress *a; |
1622 | ||
1623 | assert(m); | |
1624 | ||
4e945a6f | 1625 | a = manager_find_link_address(m, family, in_addr); |
ec2c5e43 LP |
1626 | if (a) |
1627 | return a->link->ifindex; | |
1628 | ||
1629 | return 0; | |
1630 | } | |
1631 | ||
eb60f9cd LP |
1632 | void manager_refresh_rrs(Manager *m) { |
1633 | Iterator i; | |
1634 | Link *l; | |
1635 | ||
1636 | assert(m); | |
1637 | ||
1638 | m->host_ipv4_key = dns_resource_key_unref(m->host_ipv4_key); | |
1639 | m->host_ipv6_key = dns_resource_key_unref(m->host_ipv6_key); | |
1640 | ||
1641 | HASHMAP_FOREACH(l, m->links, i) { | |
1642 | link_add_rrs(l, true); | |
1643 | link_add_rrs(l, false); | |
1644 | } | |
1645 | } | |
1646 | ||
ec2c5e43 LP |
1647 | int manager_next_hostname(Manager *m) { |
1648 | const char *p; | |
556a2294 | 1649 | uint64_t u, a; |
ec2c5e43 | 1650 | char *h; |
623a4c97 LP |
1651 | |
1652 | assert(m); | |
1653 | ||
ec2c5e43 LP |
1654 | p = strchr(m->hostname, 0); |
1655 | assert(p); | |
1656 | ||
1657 | while (p > m->hostname) { | |
1658 | if (!strchr("0123456789", p[-1])) | |
1659 | break; | |
1660 | ||
1661 | p--; | |
1662 | } | |
1663 | ||
1664 | if (*p == 0 || safe_atou64(p, &u) < 0 || u <= 0) | |
1665 | u = 1; | |
1666 | ||
556a2294 LP |
1667 | /* Add a random number to the old value. This way we can avoid |
1668 | * that two hosts pick the same hostname, win on IPv4 and lose | |
1669 | * on IPv6 (or vice versa), and pick the same hostname | |
1670 | * replacement hostname, ad infinitum. We still want the | |
1671 | * numbers to go up monotonically, hence we just add a random | |
1672 | * value 1..10 */ | |
1673 | ||
1674 | random_bytes(&a, sizeof(a)); | |
1675 | u += 1 + a % 10; | |
ec2c5e43 LP |
1676 | |
1677 | if (asprintf(&h, "%.*s%" PRIu64, (int) (p - m->hostname), m->hostname, u) < 0) | |
1678 | return -ENOMEM; | |
1679 | ||
eb60f9cd | 1680 | log_info("Hostname conflict, changing published hostname from '%s' to '%s'.", m->hostname, h); |
ec2c5e43 LP |
1681 | |
1682 | free(m->hostname); | |
1683 | m->hostname = h; | |
1684 | ||
eb60f9cd | 1685 | manager_refresh_rrs(m); |
623a4c97 LP |
1686 | |
1687 | return 0; | |
1688 | } | |
ec2c5e43 | 1689 | |
4e945a6f | 1690 | LinkAddress* manager_find_link_address(Manager *m, int family, const union in_addr_union *in_addr) { |
ec2c5e43 LP |
1691 | Iterator i; |
1692 | Link *l; | |
1693 | ||
1694 | assert(m); | |
1695 | ||
1696 | HASHMAP_FOREACH(l, m->links, i) { | |
1697 | LinkAddress *a; | |
1698 | ||
1699 | a = link_find_address(l, family, in_addr); | |
1700 | if (a) | |
1701 | return a; | |
1702 | } | |
1703 | ||
1704 | return NULL; | |
1705 | } | |
1706 | ||
a4076574 | 1707 | bool manager_our_packet(Manager *m, DnsPacket *p) { |
ec2c5e43 LP |
1708 | assert(m); |
1709 | assert(p); | |
1710 | ||
4e945a6f | 1711 | return !!manager_find_link_address(m, p->family, &p->sender); |
ec2c5e43 | 1712 | } |
4e945a6f | 1713 | |
a4076574 LP |
1714 | DnsScope* manager_find_scope(Manager *m, DnsPacket *p) { |
1715 | Link *l; | |
1716 | ||
1717 | assert(m); | |
1718 | assert(p); | |
1719 | ||
1720 | l = hashmap_get(m->links, INT_TO_PTR(p->ifindex)); | |
1721 | if (!l) | |
1722 | return NULL; | |
1723 | ||
1724 | if (p->protocol == DNS_PROTOCOL_LLMNR) { | |
1725 | if (p->family == AF_INET) | |
1726 | return l->llmnr_ipv4_scope; | |
1727 | else if (p->family == AF_INET6) | |
1728 | return l->llmnr_ipv6_scope; | |
1729 | } | |
1730 | ||
1731 | return NULL; | |
1732 | } | |
1733 | ||
902bb5d8 LP |
1734 | void manager_verify_all(Manager *m) { |
1735 | DnsScope *s; | |
1736 | ||
1737 | assert(m); | |
1738 | ||
1739 | LIST_FOREACH(scopes, s, m->dns_scopes) | |
1740 | dns_zone_verify_all(&s->zone); | |
1741 | } | |
1742 | ||
4e945a6f LP |
1743 | static const char* const support_table[_SUPPORT_MAX] = { |
1744 | [SUPPORT_NO] = "no", | |
1745 | [SUPPORT_YES] = "yes", | |
1746 | [SUPPORT_RESOLVE] = "resolve", | |
1747 | }; | |
1748 | DEFINE_STRING_TABLE_LOOKUP(support, Support); |