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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 | ||
091a364c | 22 | #include <resolv.h> |
74b2466e | 23 | #include <sys/ioctl.h> |
0a6f50c0 | 24 | #include <poll.h> |
74b2466e | 25 | #include <netinet/in.h> |
091a364c | 26 | |
74b2466e | 27 | #include "rtnl-util.h" |
091a364c | 28 | #include "network-internal.h" |
74b2466e | 29 | #include "socket-util.h" |
a2a416f7 | 30 | #include "af-list.h" |
eb60f9cd | 31 | #include "utf8.h" |
a5a807e6 | 32 | #include "fileio-label.h" |
822db23c | 33 | #include "ordered-set.h" |
3df3e884 | 34 | #include "random-util.h" |
4e945a6f | 35 | |
eb60f9cd | 36 | #include "resolved-dns-domain.h" |
39d8db04 LP |
37 | #include "resolved-conf.h" |
38 | #include "resolved-bus.h" | |
39 | #include "resolved-manager.h" | |
74b2466e LP |
40 | |
41 | #define SEND_TIMEOUT_USEC (200 * USEC_PER_MSEC) | |
42 | ||
43 | static int manager_process_link(sd_rtnl *rtnl, sd_rtnl_message *mm, void *userdata) { | |
44 | Manager *m = userdata; | |
45 | uint16_t type; | |
46 | Link *l; | |
47 | int ifindex, r; | |
48 | ||
49 | assert(rtnl); | |
50 | assert(m); | |
51 | assert(mm); | |
52 | ||
53 | r = sd_rtnl_message_get_type(mm, &type); | |
54 | if (r < 0) | |
55 | goto fail; | |
56 | ||
57 | r = sd_rtnl_message_link_get_ifindex(mm, &ifindex); | |
58 | if (r < 0) | |
59 | goto fail; | |
60 | ||
61 | l = hashmap_get(m->links, INT_TO_PTR(ifindex)); | |
62 | ||
63 | switch (type) { | |
64 | ||
a2a416f7 LP |
65 | case RTM_NEWLINK:{ |
66 | bool is_new = !l; | |
74b2466e | 67 | |
a2a416f7 | 68 | if (!l) { |
74b2466e LP |
69 | r = link_new(m, &l, ifindex); |
70 | if (r < 0) | |
71 | goto fail; | |
72 | } | |
73 | ||
74 | r = link_update_rtnl(l, mm); | |
75 | if (r < 0) | |
76 | goto fail; | |
77 | ||
21d73c87 LP |
78 | r = link_update_monitor(l); |
79 | if (r < 0) | |
80 | goto fail; | |
81 | ||
a2a416f7 LP |
82 | if (is_new) |
83 | log_debug("Found new link %i/%s", ifindex, l->name); | |
84 | ||
74b2466e | 85 | break; |
a2a416f7 | 86 | } |
74b2466e LP |
87 | |
88 | case RTM_DELLINK: | |
89 | if (l) { | |
a2a416f7 | 90 | log_debug("Removing link %i/%s", l->ifindex, l->name); |
74b2466e LP |
91 | link_free(l); |
92 | } | |
93 | ||
94 | break; | |
95 | } | |
96 | ||
97 | return 0; | |
98 | ||
99 | fail: | |
da927ba9 | 100 | log_warning_errno(r, "Failed to process RTNL link message: %m"); |
74b2466e LP |
101 | return 0; |
102 | } | |
103 | ||
104 | static int manager_process_address(sd_rtnl *rtnl, sd_rtnl_message *mm, void *userdata) { | |
105 | Manager *m = userdata; | |
106 | union in_addr_union address; | |
74b2466e | 107 | uint16_t type; |
0dd25fb9 | 108 | int r, ifindex, family; |
74b2466e LP |
109 | LinkAddress *a; |
110 | Link *l; | |
111 | ||
112 | assert(rtnl); | |
113 | assert(mm); | |
114 | assert(m); | |
115 | ||
116 | r = sd_rtnl_message_get_type(mm, &type); | |
117 | if (r < 0) | |
118 | goto fail; | |
119 | ||
120 | r = sd_rtnl_message_addr_get_ifindex(mm, &ifindex); | |
121 | if (r < 0) | |
122 | goto fail; | |
123 | ||
124 | l = hashmap_get(m->links, INT_TO_PTR(ifindex)); | |
125 | if (!l) | |
126 | return 0; | |
127 | ||
128 | r = sd_rtnl_message_addr_get_family(mm, &family); | |
129 | if (r < 0) | |
130 | goto fail; | |
131 | ||
132 | switch (family) { | |
133 | ||
134 | case AF_INET: | |
135 | r = sd_rtnl_message_read_in_addr(mm, IFA_LOCAL, &address.in); | |
136 | if (r < 0) { | |
137 | r = sd_rtnl_message_read_in_addr(mm, IFA_ADDRESS, &address.in); | |
138 | if (r < 0) | |
139 | goto fail; | |
140 | } | |
141 | ||
142 | break; | |
143 | ||
144 | case AF_INET6: | |
145 | r = sd_rtnl_message_read_in6_addr(mm, IFA_LOCAL, &address.in6); | |
146 | if (r < 0) { | |
147 | r = sd_rtnl_message_read_in6_addr(mm, IFA_ADDRESS, &address.in6); | |
148 | if (r < 0) | |
149 | goto fail; | |
150 | } | |
151 | ||
152 | break; | |
153 | ||
154 | default: | |
155 | return 0; | |
156 | } | |
157 | ||
158 | a = link_find_address(l, family, &address); | |
159 | ||
160 | switch (type) { | |
161 | ||
162 | case RTM_NEWADDR: | |
163 | ||
164 | if (!a) { | |
165 | r = link_address_new(l, &a, family, &address); | |
166 | if (r < 0) | |
167 | return r; | |
168 | } | |
169 | ||
170 | r = link_address_update_rtnl(a, mm); | |
171 | if (r < 0) | |
172 | return r; | |
173 | ||
174 | break; | |
175 | ||
176 | case RTM_DELADDR: | |
177 | if (a) | |
178 | link_address_free(a); | |
179 | break; | |
180 | } | |
181 | ||
182 | return 0; | |
183 | ||
184 | fail: | |
da927ba9 | 185 | log_warning_errno(r, "Failed to process RTNL address message: %m"); |
74b2466e LP |
186 | return 0; |
187 | } | |
188 | ||
74b2466e LP |
189 | static int manager_rtnl_listen(Manager *m) { |
190 | _cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL, *reply = NULL; | |
191 | sd_rtnl_message *i; | |
192 | int r; | |
193 | ||
194 | assert(m); | |
195 | ||
cc98b302 | 196 | /* First, subscribe to interfaces coming and going */ |
74b2466e LP |
197 | r = sd_rtnl_open(&m->rtnl, 3, RTNLGRP_LINK, RTNLGRP_IPV4_IFADDR, RTNLGRP_IPV6_IFADDR); |
198 | if (r < 0) | |
199 | return r; | |
200 | ||
201 | r = sd_rtnl_attach_event(m->rtnl, m->event, 0); | |
202 | if (r < 0) | |
203 | return r; | |
204 | ||
205 | r = sd_rtnl_add_match(m->rtnl, RTM_NEWLINK, manager_process_link, m); | |
206 | if (r < 0) | |
207 | return r; | |
208 | ||
209 | r = sd_rtnl_add_match(m->rtnl, RTM_DELLINK, manager_process_link, m); | |
210 | if (r < 0) | |
211 | return r; | |
212 | ||
213 | r = sd_rtnl_add_match(m->rtnl, RTM_NEWADDR, manager_process_address, m); | |
214 | if (r < 0) | |
215 | return r; | |
091a364c | 216 | |
74b2466e LP |
217 | r = sd_rtnl_add_match(m->rtnl, RTM_DELADDR, manager_process_address, m); |
218 | if (r < 0) | |
219 | return r; | |
220 | ||
221 | /* Then, enumerate all links */ | |
222 | r = sd_rtnl_message_new_link(m->rtnl, &req, RTM_GETLINK, 0); | |
223 | if (r < 0) | |
224 | return r; | |
225 | ||
226 | r = sd_rtnl_message_request_dump(req, true); | |
227 | if (r < 0) | |
228 | return r; | |
229 | ||
230 | r = sd_rtnl_call(m->rtnl, req, 0, &reply); | |
231 | if (r < 0) | |
232 | return r; | |
233 | ||
234 | for (i = reply; i; i = sd_rtnl_message_next(i)) { | |
235 | r = manager_process_link(m->rtnl, i, m); | |
236 | if (r < 0) | |
237 | return r; | |
238 | } | |
239 | ||
240 | req = sd_rtnl_message_unref(req); | |
241 | reply = sd_rtnl_message_unref(reply); | |
242 | ||
243 | /* Finally, enumerate all addresses, too */ | |
244 | r = sd_rtnl_message_new_addr(m->rtnl, &req, RTM_GETADDR, 0, AF_UNSPEC); | |
245 | if (r < 0) | |
246 | return r; | |
247 | ||
248 | r = sd_rtnl_message_request_dump(req, true); | |
249 | if (r < 0) | |
250 | return r; | |
251 | ||
252 | r = sd_rtnl_call(m->rtnl, req, 0, &reply); | |
253 | if (r < 0) | |
254 | return r; | |
255 | ||
256 | for (i = reply; i; i = sd_rtnl_message_next(i)) { | |
257 | r = manager_process_address(m->rtnl, i, m); | |
258 | if (r < 0) | |
259 | return r; | |
260 | } | |
261 | ||
262 | return r; | |
263 | } | |
264 | ||
265 | static int on_network_event(sd_event_source *s, int fd, uint32_t revents, void *userdata) { | |
266 | Manager *m = userdata; | |
267 | Iterator i; | |
268 | Link *l; | |
269 | int r; | |
270 | ||
271 | assert(m); | |
272 | ||
273 | sd_network_monitor_flush(m->network_monitor); | |
274 | ||
275 | HASHMAP_FOREACH(l, m->links, i) { | |
276 | r = link_update_monitor(l); | |
277 | if (r < 0) | |
da927ba9 | 278 | log_warning_errno(r, "Failed to update monitor information for %i: %m", l->ifindex); |
74b2466e LP |
279 | } |
280 | ||
281 | r = manager_write_resolv_conf(m); | |
282 | if (r < 0) | |
da927ba9 | 283 | log_warning_errno(r, "Could not update resolv.conf: %m"); |
74b2466e LP |
284 | |
285 | return 0; | |
286 | } | |
287 | ||
288 | static int manager_network_monitor_listen(Manager *m) { | |
289 | int r, fd, events; | |
290 | ||
291 | assert(m); | |
292 | ||
0014a4ad | 293 | r = sd_network_monitor_new(&m->network_monitor, NULL); |
74b2466e LP |
294 | if (r < 0) |
295 | return r; | |
296 | ||
297 | fd = sd_network_monitor_get_fd(m->network_monitor); | |
298 | if (fd < 0) | |
299 | return fd; | |
300 | ||
301 | events = sd_network_monitor_get_events(m->network_monitor); | |
302 | if (events < 0) | |
303 | return events; | |
304 | ||
305 | r = sd_event_add_io(m->event, &m->network_event_source, fd, events, &on_network_event, m); | |
306 | if (r < 0) | |
307 | return r; | |
308 | ||
309 | return 0; | |
310 | } | |
311 | ||
eb60f9cd LP |
312 | static int determine_hostname(char **ret) { |
313 | _cleanup_free_ char *h = NULL, *n = NULL; | |
314 | int r; | |
315 | ||
316 | assert(ret); | |
317 | ||
318 | h = gethostname_malloc(); | |
319 | if (!h) | |
320 | return log_oom(); | |
321 | ||
322 | if (!utf8_is_valid(h)) { | |
323 | log_error("System hostname is not UTF-8 clean."); | |
324 | return -EINVAL; | |
325 | } | |
326 | ||
327 | r = dns_name_normalize(h, &n); | |
328 | if (r < 0) { | |
329 | log_error("System hostname '%s' cannot be normalized.", h); | |
330 | return r; | |
331 | } | |
332 | ||
333 | *ret = n; | |
334 | n = NULL; | |
335 | ||
336 | return 0; | |
337 | } | |
338 | ||
339 | static int on_hostname_change(sd_event_source *es, int fd, uint32_t revents, void *userdata) { | |
340 | _cleanup_free_ char *h = NULL; | |
341 | Manager *m = userdata; | |
342 | int r; | |
343 | ||
344 | assert(m); | |
345 | ||
346 | r = determine_hostname(&h); | |
347 | if (r < 0) | |
348 | return 0; /* ignore invalid hostnames */ | |
349 | ||
350 | if (streq(h, m->hostname)) | |
351 | return 0; | |
352 | ||
353 | log_info("System hostname changed to '%s'.", h); | |
354 | free(m->hostname); | |
355 | m->hostname = h; | |
356 | h = NULL; | |
357 | ||
358 | manager_refresh_rrs(m); | |
359 | ||
360 | return 0; | |
361 | } | |
362 | ||
363 | static int manager_watch_hostname(Manager *m) { | |
eb60f9cd LP |
364 | int r; |
365 | ||
366 | assert(m); | |
367 | ||
368 | m->hostname_fd = open("/proc/sys/kernel/hostname", O_RDONLY|O_CLOEXEC|O_NDELAY|O_NOCTTY); | |
369 | if (m->hostname_fd < 0) { | |
56f64d95 | 370 | log_warning_errno(errno, "Failed to watch hostname: %m"); |
eb60f9cd LP |
371 | return 0; |
372 | } | |
373 | ||
374 | r = sd_event_add_io(m->event, &m->hostname_event_source, m->hostname_fd, 0, on_hostname_change, m); | |
375 | if (r < 0) { | |
376 | if (r == -EPERM) | |
377 | /* kernels prior to 3.2 don't support polling this file. Ignore the failure. */ | |
378 | m->hostname_fd = safe_close(m->hostname_fd); | |
8d3d7072 MS |
379 | else |
380 | return log_error_errno(r, "Failed to add hostname event source: %m"); | |
eb60f9cd LP |
381 | } |
382 | ||
383 | r = determine_hostname(&m->hostname); | |
384 | if (r < 0) { | |
385 | log_info("Defaulting to hostname 'linux'."); | |
386 | m->hostname = strdup("linux"); | |
387 | if (!m->hostname) | |
388 | return log_oom(); | |
389 | } else | |
390 | log_info("Using system hostname '%s'.", m->hostname); | |
391 | ||
392 | return 0; | |
393 | } | |
394 | ||
edc501d4 LP |
395 | static void manager_llmnr_stop(Manager *m) { |
396 | assert(m); | |
397 | ||
398 | m->llmnr_ipv4_udp_event_source = sd_event_source_unref(m->llmnr_ipv4_udp_event_source); | |
399 | m->llmnr_ipv4_udp_fd = safe_close(m->llmnr_ipv4_udp_fd); | |
400 | ||
401 | m->llmnr_ipv6_udp_event_source = sd_event_source_unref(m->llmnr_ipv6_udp_event_source); | |
402 | m->llmnr_ipv6_udp_fd = safe_close(m->llmnr_ipv6_udp_fd); | |
403 | ||
404 | m->llmnr_ipv4_tcp_event_source = sd_event_source_unref(m->llmnr_ipv4_tcp_event_source); | |
405 | m->llmnr_ipv4_tcp_fd = safe_close(m->llmnr_ipv4_tcp_fd); | |
406 | ||
407 | m->llmnr_ipv6_tcp_event_source = sd_event_source_unref(m->llmnr_ipv6_tcp_event_source); | |
408 | m->llmnr_ipv6_tcp_fd = safe_close(m->llmnr_ipv6_tcp_fd); | |
409 | } | |
410 | ||
411 | static int manager_llmnr_start(Manager *m) { | |
412 | int r; | |
413 | ||
414 | assert(m); | |
415 | ||
416 | if (m->llmnr_support == SUPPORT_NO) | |
417 | return 0; | |
418 | ||
419 | r = manager_llmnr_ipv4_udp_fd(m); | |
420 | if (r == -EADDRINUSE) | |
421 | goto eaddrinuse; | |
422 | if (r < 0) | |
423 | return r; | |
424 | ||
edc501d4 LP |
425 | r = manager_llmnr_ipv4_tcp_fd(m); |
426 | if (r == -EADDRINUSE) | |
427 | goto eaddrinuse; | |
428 | if (r < 0) | |
429 | return r; | |
430 | ||
90ab5042 LP |
431 | if (socket_ipv6_is_supported()) { |
432 | r = manager_llmnr_ipv6_udp_fd(m); | |
433 | if (r == -EADDRINUSE) | |
434 | goto eaddrinuse; | |
435 | if (r < 0) | |
436 | return r; | |
437 | ||
438 | r = manager_llmnr_ipv6_tcp_fd(m); | |
439 | if (r == -EADDRINUSE) | |
440 | goto eaddrinuse; | |
441 | if (r < 0) | |
442 | return r; | |
443 | } | |
edc501d4 LP |
444 | |
445 | return 0; | |
446 | ||
447 | eaddrinuse: | |
c4147df1 | 448 | log_warning("There appears to be another LLMNR responder running. Turning off LLMNR support."); |
edc501d4 LP |
449 | m->llmnr_support = SUPPORT_NO; |
450 | manager_llmnr_stop(m); | |
90ab5042 | 451 | |
edc501d4 LP |
452 | return 0; |
453 | } | |
454 | ||
091a364c | 455 | int manager_new(Manager **ret) { |
74b2466e | 456 | _cleanup_(manager_freep) Manager *m = NULL; |
091a364c TG |
457 | int r; |
458 | ||
c92e531c LP |
459 | assert(ret); |
460 | ||
091a364c TG |
461 | m = new0(Manager, 1); |
462 | if (!m) | |
463 | return -ENOMEM; | |
464 | ||
74b2466e | 465 | m->dns_ipv4_fd = m->dns_ipv6_fd = -1; |
1716f6dc | 466 | m->llmnr_ipv4_udp_fd = m->llmnr_ipv6_udp_fd = -1; |
623a4c97 | 467 | m->llmnr_ipv4_tcp_fd = m->llmnr_ipv6_tcp_fd = -1; |
eb60f9cd | 468 | m->hostname_fd = -1; |
1716f6dc | 469 | |
4e945a6f | 470 | m->llmnr_support = SUPPORT_YES; |
5cb36f41 | 471 | m->read_resolv_conf = true; |
091a364c | 472 | |
4e945a6f | 473 | r = manager_parse_dns_server(m, DNS_SERVER_FALLBACK, DNS_SERVERS); |
091a364c TG |
474 | if (r < 0) |
475 | return r; | |
476 | ||
477 | r = sd_event_default(&m->event); | |
478 | if (r < 0) | |
479 | return r; | |
480 | ||
481 | sd_event_add_signal(m->event, NULL, SIGTERM, NULL, NULL); | |
482 | sd_event_add_signal(m->event, NULL, SIGINT, NULL, NULL); | |
483 | ||
484 | sd_event_set_watchdog(m->event, true); | |
485 | ||
eb60f9cd LP |
486 | r = manager_watch_hostname(m); |
487 | if (r < 0) | |
488 | return r; | |
489 | ||
1716f6dc | 490 | r = dns_scope_new(m, &m->unicast_scope, NULL, DNS_PROTOCOL_DNS, AF_UNSPEC); |
74b2466e LP |
491 | if (r < 0) |
492 | return r; | |
493 | ||
494 | r = manager_network_monitor_listen(m); | |
495 | if (r < 0) | |
496 | return r; | |
497 | ||
498 | r = manager_rtnl_listen(m); | |
499 | if (r < 0) | |
500 | return r; | |
501 | ||
502 | r = manager_connect_bus(m); | |
503 | if (r < 0) | |
504 | return r; | |
505 | ||
091a364c TG |
506 | *ret = m; |
507 | m = NULL; | |
508 | ||
509 | return 0; | |
510 | } | |
511 | ||
edc501d4 LP |
512 | int manager_start(Manager *m) { |
513 | int r; | |
514 | ||
515 | assert(m); | |
516 | ||
517 | r = manager_llmnr_start(m); | |
518 | if (r < 0) | |
519 | return r; | |
520 | ||
521 | return 0; | |
522 | } | |
523 | ||
74b2466e LP |
524 | Manager *manager_free(Manager *m) { |
525 | Link *l; | |
091a364c TG |
526 | |
527 | if (!m) | |
74b2466e LP |
528 | return NULL; |
529 | ||
74b2466e LP |
530 | while ((l = hashmap_first(m->links))) |
531 | link_free(l); | |
f0e15467 LP |
532 | |
533 | while (m->dns_queries) | |
534 | dns_query_free(m->dns_queries); | |
74b2466e LP |
535 | |
536 | dns_scope_free(m->unicast_scope); | |
537 | ||
3e684349 LP |
538 | manager_flush_dns_servers(m, DNS_SERVER_SYSTEM); |
539 | manager_flush_dns_servers(m, DNS_SERVER_FALLBACK); | |
091a364c | 540 | |
f0e15467 LP |
541 | hashmap_free(m->links); |
542 | hashmap_free(m->dns_transactions); | |
543 | ||
096b6773 LP |
544 | sd_event_source_unref(m->network_event_source); |
545 | sd_network_monitor_unref(m->network_monitor); | |
091a364c | 546 | |
74b2466e LP |
547 | sd_event_source_unref(m->dns_ipv4_event_source); |
548 | sd_event_source_unref(m->dns_ipv6_event_source); | |
74b2466e LP |
549 | safe_close(m->dns_ipv4_fd); |
550 | safe_close(m->dns_ipv6_fd); | |
551 | ||
edc501d4 | 552 | manager_llmnr_stop(m); |
623a4c97 | 553 | |
902bb5d8 | 554 | sd_bus_slot_unref(m->prepare_for_sleep_slot); |
74b2466e LP |
555 | sd_event_source_unref(m->bus_retry_event_source); |
556 | sd_bus_unref(m->bus); | |
091a364c | 557 | |
74b2466e | 558 | sd_event_unref(m->event); |
623a4c97 LP |
559 | |
560 | dns_resource_key_unref(m->host_ipv4_key); | |
561 | dns_resource_key_unref(m->host_ipv6_key); | |
eb60f9cd LP |
562 | |
563 | safe_close(m->hostname_fd); | |
564 | sd_event_source_unref(m->hostname_event_source); | |
623a4c97 | 565 | free(m->hostname); |
eb60f9cd | 566 | |
091a364c | 567 | free(m); |
74b2466e LP |
568 | |
569 | return NULL; | |
091a364c TG |
570 | } |
571 | ||
5cb36f41 LP |
572 | int manager_read_resolv_conf(Manager *m) { |
573 | _cleanup_fclose_ FILE *f = NULL; | |
574 | struct stat st, own; | |
575 | char line[LINE_MAX]; | |
576 | DnsServer *s, *nx; | |
577 | usec_t t; | |
578 | int r; | |
579 | ||
580 | assert(m); | |
581 | ||
582 | /* Reads the system /etc/resolv.conf, if it exists and is not | |
583 | * symlinked to our own resolv.conf instance */ | |
584 | ||
585 | if (!m->read_resolv_conf) | |
586 | return 0; | |
587 | ||
588 | r = stat("/etc/resolv.conf", &st); | |
589 | if (r < 0) { | |
590 | if (errno != ENOENT) | |
56f64d95 | 591 | log_warning_errno(errno, "Failed to open /etc/resolv.conf: %m"); |
5cb36f41 LP |
592 | r = -errno; |
593 | goto clear; | |
594 | } | |
595 | ||
596 | /* Have we already seen the file? */ | |
597 | t = timespec_load(&st.st_mtim); | |
598 | if (t == m->resolv_conf_mtime) | |
599 | return 0; | |
600 | ||
601 | m->resolv_conf_mtime = t; | |
602 | ||
603 | /* Is it symlinked to our own file? */ | |
604 | if (stat("/run/systemd/resolve/resolv.conf", &own) >= 0 && | |
605 | st.st_dev == own.st_dev && | |
606 | st.st_ino == own.st_ino) { | |
607 | r = 0; | |
608 | goto clear; | |
609 | } | |
610 | ||
611 | f = fopen("/etc/resolv.conf", "re"); | |
612 | if (!f) { | |
613 | if (errno != ENOENT) | |
56f64d95 | 614 | log_warning_errno(errno, "Failed to open /etc/resolv.conf: %m"); |
5cb36f41 LP |
615 | r = -errno; |
616 | goto clear; | |
617 | } | |
618 | ||
619 | if (fstat(fileno(f), &st) < 0) { | |
56f64d95 | 620 | log_error_errno(errno, "Failed to stat open file: %m"); |
5cb36f41 LP |
621 | r = -errno; |
622 | goto clear; | |
623 | } | |
624 | ||
625 | LIST_FOREACH(servers, s, m->dns_servers) | |
626 | s->marked = true; | |
627 | ||
628 | FOREACH_LINE(line, f, r = -errno; goto clear) { | |
629 | union in_addr_union address; | |
630 | int family; | |
631 | char *l; | |
632 | const char *a; | |
633 | ||
634 | truncate_nl(line); | |
635 | ||
636 | l = strstrip(line); | |
637 | if (*l == '#' || *l == ';') | |
638 | continue; | |
639 | ||
640 | a = first_word(l, "nameserver"); | |
641 | if (!a) | |
642 | continue; | |
643 | ||
644 | r = in_addr_from_string_auto(a, &family, &address); | |
645 | if (r < 0) { | |
646 | log_warning("Failed to parse name server %s.", a); | |
647 | continue; | |
648 | } | |
649 | ||
650 | LIST_FOREACH(servers, s, m->dns_servers) | |
651 | if (s->family == family && in_addr_equal(family, &s->address, &address) > 0) | |
652 | break; | |
653 | ||
654 | if (s) | |
655 | s->marked = false; | |
656 | else { | |
657 | r = dns_server_new(m, NULL, DNS_SERVER_SYSTEM, NULL, family, &address); | |
658 | if (r < 0) | |
659 | goto clear; | |
660 | } | |
661 | } | |
662 | ||
663 | LIST_FOREACH_SAFE(servers, s, nx, m->dns_servers) | |
664 | if (s->marked) | |
665 | dns_server_free(s); | |
666 | ||
36a03ca2 LP |
667 | /* Whenever /etc/resolv.conf changes, start using the first |
668 | * DNS server of it. This is useful to deal with broken | |
669 | * network managing implementations (like NetworkManager), | |
670 | * that when connecting to a VPN place both the VPN DNS | |
671 | * servers and the local ones in /etc/resolv.conf. Without | |
672 | * resetting the DNS server to use back to the first entry we | |
673 | * will continue to use the local one thus being unable to | |
674 | * resolve VPN domains. */ | |
675 | manager_set_dns_server(m, m->dns_servers); | |
676 | ||
5cb36f41 LP |
677 | return 0; |
678 | ||
679 | clear: | |
680 | while (m->dns_servers) | |
681 | dns_server_free(m->dns_servers); | |
682 | ||
683 | return r; | |
684 | } | |
685 | ||
bda2c408 | 686 | static void write_resolv_conf_server(DnsServer *s, FILE *f, unsigned *count) { |
74b2466e LP |
687 | _cleanup_free_ char *t = NULL; |
688 | int r; | |
091a364c | 689 | |
74b2466e | 690 | assert(s); |
091a364c | 691 | assert(f); |
091a364c TG |
692 | assert(count); |
693 | ||
74b2466e | 694 | r = in_addr_to_string(s->family, &s->address, &t); |
4e945a6f | 695 | if (r < 0) { |
da927ba9 | 696 | log_warning_errno(r, "Invalid DNS address. Ignoring: %m"); |
091a364c TG |
697 | return; |
698 | } | |
699 | ||
700 | if (*count == MAXNS) | |
87f5a193 | 701 | fputs("# Too many DNS servers configured, the following entries may be ignored.\n", f); |
091a364c | 702 | |
74b2466e | 703 | fprintf(f, "nameserver %s\n", t); |
091a364c TG |
704 | (*count) ++; |
705 | } | |
706 | ||
822db23c LP |
707 | static void write_resolv_conf_search( |
708 | const char *domain, FILE *f, | |
709 | unsigned *count, | |
710 | unsigned *length) { | |
711 | ||
bda2c408 TG |
712 | assert(domain); |
713 | assert(f); | |
714 | assert(length); | |
715 | ||
716 | if (*count >= MAXDNSRCH || | |
717 | *length + strlen(domain) > 256) { | |
718 | if (*count == MAXDNSRCH) | |
719 | fputs(" # Too many search domains configured, remaining ones ignored.", f); | |
720 | if (*length <= 256) | |
721 | fputs(" # Total length of all search domains is too long, remaining ones ignored.", f); | |
722 | ||
723 | return; | |
724 | } | |
725 | ||
726 | fprintf(f, " %s", domain); | |
727 | ||
728 | (*length) += strlen(domain); | |
729 | (*count) ++; | |
730 | } | |
731 | ||
822db23c | 732 | static int write_resolv_conf_contents(FILE *f, OrderedSet *dns, OrderedSet *domains) { |
4713135e ZJS |
733 | Iterator i; |
734 | ||
735 | fputs("# This file is managed by systemd-resolved(8). Do not edit.\n#\n" | |
736 | "# Third party programs must not access this file directly, but\n" | |
737 | "# only through the symlink at /etc/resolv.conf. To manage\n" | |
738 | "# resolv.conf(5) in a different way, replace the symlink by a\n" | |
739 | "# static file or a different symlink.\n\n", f); | |
740 | ||
822db23c | 741 | if (ordered_set_isempty(dns)) |
4713135e ZJS |
742 | fputs("# No DNS servers known.\n", f); |
743 | else { | |
744 | DnsServer *s; | |
745 | unsigned count = 0; | |
746 | ||
822db23c | 747 | ORDERED_SET_FOREACH(s, dns, i) |
4713135e ZJS |
748 | write_resolv_conf_server(s, f, &count); |
749 | } | |
750 | ||
822db23c | 751 | if (!ordered_set_isempty(domains)) { |
4713135e ZJS |
752 | unsigned length = 0, count = 0; |
753 | char *domain; | |
754 | ||
755 | fputs("search", f); | |
822db23c | 756 | ORDERED_SET_FOREACH(domain, domains, i) |
4713135e ZJS |
757 | write_resolv_conf_search(domain, f, &count, &length); |
758 | fputs("\n", f); | |
759 | } | |
760 | ||
761 | return fflush_and_check(f); | |
762 | } | |
763 | ||
74b2466e | 764 | int manager_write_resolv_conf(Manager *m) { |
4e945a6f | 765 | static const char path[] = "/run/systemd/resolve/resolv.conf"; |
091a364c TG |
766 | _cleanup_free_ char *temp_path = NULL; |
767 | _cleanup_fclose_ FILE *f = NULL; | |
822db23c | 768 | _cleanup_ordered_set_free_ OrderedSet *dns = NULL, *domains = NULL; |
74b2466e LP |
769 | DnsServer *s; |
770 | Iterator i; | |
771 | Link *l; | |
772 | int r; | |
091a364c TG |
773 | |
774 | assert(m); | |
775 | ||
5cb36f41 LP |
776 | /* Read the system /etc/resolv.conf first */ |
777 | manager_read_resolv_conf(m); | |
778 | ||
87f5a193 | 779 | /* Add the full list to a set, to filter out duplicates */ |
822db23c | 780 | dns = ordered_set_new(&dns_server_hash_ops); |
87f5a193 LP |
781 | if (!dns) |
782 | return -ENOMEM; | |
783 | ||
822db23c | 784 | domains = ordered_set_new(&dns_name_hash_ops); |
bda2c408 TG |
785 | if (!domains) |
786 | return -ENOMEM; | |
787 | ||
87f5a193 LP |
788 | /* First add the system-wide servers */ |
789 | LIST_FOREACH(servers, s, m->dns_servers) { | |
822db23c | 790 | r = ordered_set_put(dns, s); |
87f5a193 LP |
791 | if (r == -EEXIST) |
792 | continue; | |
793 | if (r < 0) | |
794 | return r; | |
795 | } | |
796 | ||
bda2c408 TG |
797 | /* Then, add the per-link servers and domains */ |
798 | HASHMAP_FOREACH(l, m->links, i) { | |
799 | char **domain; | |
800 | ||
87f5a193 | 801 | LIST_FOREACH(servers, s, l->dns_servers) { |
822db23c | 802 | r = ordered_set_put(dns, s); |
87f5a193 LP |
803 | if (r == -EEXIST) |
804 | continue; | |
805 | if (r < 0) | |
806 | return r; | |
807 | } | |
808 | ||
bda2c408 TG |
809 | if (!l->unicast_scope) |
810 | continue; | |
811 | ||
812 | STRV_FOREACH(domain, l->unicast_scope->domains) { | |
822db23c | 813 | r = ordered_set_put(domains, *domain); |
bda2c408 TG |
814 | if (r == -EEXIST) |
815 | continue; | |
816 | if (r < 0) | |
817 | return r; | |
818 | } | |
819 | } | |
820 | ||
87f5a193 | 821 | /* If we found nothing, add the fallback servers */ |
822db23c | 822 | if (ordered_set_isempty(dns)) { |
87f5a193 | 823 | LIST_FOREACH(servers, s, m->fallback_dns_servers) { |
822db23c | 824 | r = ordered_set_put(dns, s); |
87f5a193 LP |
825 | if (r == -EEXIST) |
826 | continue; | |
827 | if (r < 0) | |
828 | return r; | |
829 | } | |
830 | } | |
831 | ||
a5a807e6 | 832 | r = fopen_temporary_label(path, path, &f, &temp_path); |
091a364c TG |
833 | if (r < 0) |
834 | return r; | |
835 | ||
836 | fchmod(fileno(f), 0644); | |
837 | ||
4713135e | 838 | r = write_resolv_conf_contents(f, dns, domains); |
74b2466e LP |
839 | if (r < 0) |
840 | goto fail; | |
841 | ||
842 | if (rename(temp_path, path) < 0) { | |
843 | r = -errno; | |
844 | goto fail; | |
845 | } | |
091a364c | 846 | |
74b2466e | 847 | return 0; |
091a364c | 848 | |
74b2466e | 849 | fail: |
822db23c LP |
850 | (void) unlink(path); |
851 | (void) unlink(temp_path); | |
74b2466e LP |
852 | return r; |
853 | } | |
091a364c | 854 | |
1716f6dc | 855 | int manager_recv(Manager *m, int fd, DnsProtocol protocol, DnsPacket **ret) { |
74b2466e | 856 | _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL; |
1716f6dc LP |
857 | union { |
858 | struct cmsghdr header; /* For alignment */ | |
40a1eebd | 859 | uint8_t buffer[CMSG_SPACE(MAXSIZE(struct in_pktinfo, struct in6_pktinfo)) |
1716f6dc | 860 | + CMSG_SPACE(int) /* ttl/hoplimit */ |
623a4c97 | 861 | + EXTRA_CMSG_SPACE /* kernel appears to require extra buffer space */]; |
1716f6dc LP |
862 | } control; |
863 | union sockaddr_union sa; | |
74b2466e | 864 | struct msghdr mh = {}; |
1716f6dc | 865 | struct cmsghdr *cmsg; |
74b2466e | 866 | struct iovec iov; |
1716f6dc | 867 | int ms = 0, r; |
74b2466e LP |
868 | ssize_t l; |
869 | ||
870 | assert(m); | |
1716f6dc | 871 | assert(fd >= 0); |
74b2466e LP |
872 | assert(ret); |
873 | ||
74b2466e LP |
874 | r = ioctl(fd, FIONREAD, &ms); |
875 | if (r < 0) | |
876 | return -errno; | |
877 | if (ms < 0) | |
878 | return -EIO; | |
879 | ||
1716f6dc | 880 | r = dns_packet_new(&p, protocol, ms); |
74b2466e LP |
881 | if (r < 0) |
882 | return r; | |
883 | ||
884 | iov.iov_base = DNS_PACKET_DATA(p); | |
885 | iov.iov_len = p->allocated; | |
886 | ||
1716f6dc LP |
887 | mh.msg_name = &sa.sa; |
888 | mh.msg_namelen = sizeof(sa); | |
74b2466e LP |
889 | mh.msg_iov = &iov; |
890 | mh.msg_iovlen = 1; | |
1716f6dc LP |
891 | mh.msg_control = &control; |
892 | mh.msg_controllen = sizeof(control); | |
74b2466e | 893 | |
a38d9945 | 894 | l = recvmsg(fd, &mh, 0); |
74b2466e | 895 | if (l < 0) { |
ad867662 | 896 | if (errno == EAGAIN || errno == EINTR) |
74b2466e LP |
897 | return 0; |
898 | ||
899 | return -errno; | |
091a364c TG |
900 | } |
901 | ||
74b2466e LP |
902 | if (l <= 0) |
903 | return -EIO; | |
091a364c | 904 | |
1716f6dc LP |
905 | assert(!(mh.msg_flags & MSG_CTRUNC)); |
906 | assert(!(mh.msg_flags & MSG_TRUNC)); | |
907 | ||
74b2466e | 908 | p->size = (size_t) l; |
091a364c | 909 | |
1716f6dc | 910 | p->family = sa.sa.sa_family; |
623a4c97 LP |
911 | p->ipproto = IPPROTO_UDP; |
912 | if (p->family == AF_INET) { | |
1716f6dc | 913 | p->sender.in = sa.in.sin_addr; |
623a4c97 LP |
914 | p->sender_port = be16toh(sa.in.sin_port); |
915 | } else if (p->family == AF_INET6) { | |
1716f6dc | 916 | p->sender.in6 = sa.in6.sin6_addr; |
623a4c97 LP |
917 | p->sender_port = be16toh(sa.in6.sin6_port); |
918 | p->ifindex = sa.in6.sin6_scope_id; | |
919 | } else | |
1716f6dc | 920 | return -EAFNOSUPPORT; |
74b2466e | 921 | |
1716f6dc | 922 | for (cmsg = CMSG_FIRSTHDR(&mh); cmsg; cmsg = CMSG_NXTHDR(&mh, cmsg)) { |
74b2466e | 923 | |
1716f6dc LP |
924 | if (cmsg->cmsg_level == IPPROTO_IPV6) { |
925 | assert(p->family == AF_INET6); | |
74b2466e | 926 | |
1716f6dc | 927 | switch (cmsg->cmsg_type) { |
74b2466e | 928 | |
1716f6dc LP |
929 | case IPV6_PKTINFO: { |
930 | struct in6_pktinfo *i = (struct in6_pktinfo*) CMSG_DATA(cmsg); | |
74b2466e | 931 | |
623a4c97 LP |
932 | if (p->ifindex <= 0) |
933 | p->ifindex = i->ipi6_ifindex; | |
934 | ||
1716f6dc LP |
935 | p->destination.in6 = i->ipi6_addr; |
936 | break; | |
937 | } | |
74b2466e | 938 | |
1716f6dc LP |
939 | case IPV6_HOPLIMIT: |
940 | p->ttl = *(int *) CMSG_DATA(cmsg); | |
941 | break; | |
74b2466e | 942 | |
1716f6dc LP |
943 | } |
944 | } else if (cmsg->cmsg_level == IPPROTO_IP) { | |
945 | assert(p->family == AF_INET); | |
74b2466e | 946 | |
1716f6dc | 947 | switch (cmsg->cmsg_type) { |
74b2466e | 948 | |
1716f6dc LP |
949 | case IP_PKTINFO: { |
950 | struct in_pktinfo *i = (struct in_pktinfo*) CMSG_DATA(cmsg); | |
091a364c | 951 | |
623a4c97 LP |
952 | if (p->ifindex <= 0) |
953 | p->ifindex = i->ipi_ifindex; | |
954 | ||
1716f6dc LP |
955 | p->destination.in = i->ipi_addr; |
956 | break; | |
957 | } | |
74b2466e | 958 | |
623a4c97 | 959 | case IP_TTL: |
1716f6dc LP |
960 | p->ttl = *(int *) CMSG_DATA(cmsg); |
961 | break; | |
962 | } | |
963 | } | |
964 | } | |
74b2466e | 965 | |
623a4c97 LP |
966 | /* The Linux kernel sets the interface index to the loopback |
967 | * device if the packet came from the local host since it | |
968 | * avoids the routing table in such a case. Let's unset the | |
969 | * interface index in such a case. */ | |
a5f03596 | 970 | if (p->ifindex == LOOPBACK_IFINDEX) |
623a4c97 LP |
971 | p->ifindex = 0; |
972 | ||
973 | /* If we don't know the interface index still, we look for the | |
974 | * first local interface with a matching address. Yuck! */ | |
975 | if (p->ifindex <= 0) | |
976 | p->ifindex = manager_find_ifindex(m, p->family, &p->destination); | |
977 | ||
74b2466e LP |
978 | *ret = p; |
979 | p = NULL; | |
980 | ||
981 | return 1; | |
982 | } | |
983 | ||
1716f6dc | 984 | static int on_dns_packet(sd_event_source *s, int fd, uint32_t revents, void *userdata) { |
74b2466e | 985 | _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL; |
ec2c5e43 | 986 | DnsTransaction *t = NULL; |
74b2466e LP |
987 | Manager *m = userdata; |
988 | int r; | |
989 | ||
1716f6dc | 990 | r = manager_recv(m, fd, DNS_PROTOCOL_DNS, &p); |
74b2466e LP |
991 | if (r <= 0) |
992 | return r; | |
993 | ||
623a4c97 | 994 | if (dns_packet_validate_reply(p) > 0) { |
ec2c5e43 | 995 | t = hashmap_get(m->dns_transactions, UINT_TO_PTR(DNS_PACKET_ID(p))); |
1716f6dc LP |
996 | if (!t) |
997 | return 0; | |
74b2466e | 998 | |
ec2c5e43 | 999 | dns_transaction_process_reply(t, p); |
623a4c97 | 1000 | |
1716f6dc | 1001 | } else |
623a4c97 | 1002 | log_debug("Invalid DNS packet."); |
74b2466e | 1003 | |
ad867662 | 1004 | return 0; |
74b2466e LP |
1005 | } |
1006 | ||
1007 | int manager_dns_ipv4_fd(Manager *m) { | |
1716f6dc | 1008 | const int one = 1; |
74b2466e LP |
1009 | int r; |
1010 | ||
091a364c TG |
1011 | assert(m); |
1012 | ||
74b2466e LP |
1013 | if (m->dns_ipv4_fd >= 0) |
1014 | return m->dns_ipv4_fd; | |
091a364c | 1015 | |
74b2466e LP |
1016 | m->dns_ipv4_fd = socket(AF_INET, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); |
1017 | if (m->dns_ipv4_fd < 0) | |
1018 | return -errno; | |
091a364c | 1019 | |
1716f6dc LP |
1020 | r = setsockopt(m->dns_ipv4_fd, IPPROTO_IP, IP_PKTINFO, &one, sizeof(one)); |
1021 | if (r < 0) { | |
1022 | r = -errno; | |
1023 | goto fail; | |
1024 | } | |
1025 | ||
1026 | r = sd_event_add_io(m->event, &m->dns_ipv4_event_source, m->dns_ipv4_fd, EPOLLIN, on_dns_packet, m); | |
74b2466e | 1027 | if (r < 0) |
1716f6dc | 1028 | goto fail; |
74b2466e LP |
1029 | |
1030 | return m->dns_ipv4_fd; | |
1716f6dc LP |
1031 | |
1032 | fail: | |
1033 | m->dns_ipv4_fd = safe_close(m->dns_ipv4_fd); | |
1034 | return r; | |
091a364c TG |
1035 | } |
1036 | ||
74b2466e | 1037 | int manager_dns_ipv6_fd(Manager *m) { |
1716f6dc | 1038 | const int one = 1; |
74b2466e LP |
1039 | int r; |
1040 | ||
1041 | assert(m); | |
091a364c | 1042 | |
74b2466e LP |
1043 | if (m->dns_ipv6_fd >= 0) |
1044 | return m->dns_ipv6_fd; | |
1045 | ||
1046 | m->dns_ipv6_fd = socket(AF_INET6, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); | |
1047 | if (m->dns_ipv6_fd < 0) | |
1048 | return -errno; | |
1049 | ||
1716f6dc LP |
1050 | r = setsockopt(m->dns_ipv6_fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, &one, sizeof(one)); |
1051 | if (r < 0) { | |
1052 | r = -errno; | |
1053 | goto fail; | |
1054 | } | |
1055 | ||
1056 | r = sd_event_add_io(m->event, &m->dns_ipv6_event_source, m->dns_ipv6_fd, EPOLLIN, on_dns_packet, m); | |
091a364c | 1057 | if (r < 0) |
1716f6dc | 1058 | goto fail; |
091a364c | 1059 | |
74b2466e | 1060 | return m->dns_ipv6_fd; |
1716f6dc LP |
1061 | |
1062 | fail: | |
1063 | m->dns_ipv6_fd = safe_close(m->dns_ipv6_fd); | |
1064 | return r; | |
74b2466e LP |
1065 | } |
1066 | ||
1067 | static int sendmsg_loop(int fd, struct msghdr *mh, int flags) { | |
1068 | int r; | |
1069 | ||
1070 | assert(fd >= 0); | |
1071 | assert(mh); | |
1072 | ||
1073 | for (;;) { | |
1074 | if (sendmsg(fd, mh, flags) >= 0) | |
1075 | return 0; | |
1076 | ||
1077 | if (errno == EINTR) | |
1078 | continue; | |
1079 | ||
1080 | if (errno != EAGAIN) | |
1081 | return -errno; | |
1082 | ||
1083 | r = fd_wait_for_event(fd, POLLOUT, SEND_TIMEOUT_USEC); | |
1084 | if (r < 0) | |
1085 | return r; | |
1086 | if (r == 0) | |
1087 | return -ETIMEDOUT; | |
1088 | } | |
1089 | } | |
1090 | ||
623a4c97 | 1091 | static int manager_ipv4_send(Manager *m, int fd, int ifindex, const struct in_addr *addr, uint16_t port, DnsPacket *p) { |
74b2466e LP |
1092 | union sockaddr_union sa = { |
1093 | .in.sin_family = AF_INET, | |
74b2466e | 1094 | }; |
1716f6dc LP |
1095 | union { |
1096 | struct cmsghdr header; /* For alignment */ | |
1097 | uint8_t buffer[CMSG_SPACE(sizeof(struct in_pktinfo))]; | |
1098 | } control; | |
74b2466e LP |
1099 | struct msghdr mh = {}; |
1100 | struct iovec iov; | |
74b2466e LP |
1101 | |
1102 | assert(m); | |
1716f6dc LP |
1103 | assert(fd >= 0); |
1104 | assert(addr); | |
1105 | assert(port > 0); | |
74b2466e LP |
1106 | assert(p); |
1107 | ||
74b2466e LP |
1108 | iov.iov_base = DNS_PACKET_DATA(p); |
1109 | iov.iov_len = p->size; | |
091a364c | 1110 | |
1716f6dc LP |
1111 | sa.in.sin_addr = *addr; |
1112 | sa.in.sin_port = htobe16(port), | |
091a364c | 1113 | |
74b2466e LP |
1114 | mh.msg_iov = &iov; |
1115 | mh.msg_iovlen = 1; | |
1116 | mh.msg_name = &sa.sa; | |
1117 | mh.msg_namelen = sizeof(sa.in); | |
091a364c | 1118 | |
74b2466e LP |
1119 | if (ifindex > 0) { |
1120 | struct cmsghdr *cmsg; | |
1121 | struct in_pktinfo *pi; | |
1122 | ||
1123 | zero(control); | |
1124 | ||
1716f6dc | 1125 | mh.msg_control = &control; |
74b2466e LP |
1126 | mh.msg_controllen = CMSG_LEN(sizeof(struct in_pktinfo)); |
1127 | ||
1128 | cmsg = CMSG_FIRSTHDR(&mh); | |
1129 | cmsg->cmsg_len = mh.msg_controllen; | |
1130 | cmsg->cmsg_level = IPPROTO_IP; | |
1131 | cmsg->cmsg_type = IP_PKTINFO; | |
1132 | ||
1133 | pi = (struct in_pktinfo*) CMSG_DATA(cmsg); | |
1134 | pi->ipi_ifindex = ifindex; | |
1135 | } | |
1136 | ||
1137 | return sendmsg_loop(fd, &mh, 0); | |
1138 | } | |
1139 | ||
623a4c97 | 1140 | static int manager_ipv6_send(Manager *m, int fd, int ifindex, const struct in6_addr *addr, uint16_t port, DnsPacket *p) { |
74b2466e LP |
1141 | union sockaddr_union sa = { |
1142 | .in6.sin6_family = AF_INET6, | |
74b2466e | 1143 | }; |
1716f6dc LP |
1144 | union { |
1145 | struct cmsghdr header; /* For alignment */ | |
1146 | uint8_t buffer[CMSG_SPACE(sizeof(struct in6_pktinfo))]; | |
1147 | } control; | |
74b2466e LP |
1148 | struct msghdr mh = {}; |
1149 | struct iovec iov; | |
74b2466e LP |
1150 | |
1151 | assert(m); | |
1716f6dc LP |
1152 | assert(fd >= 0); |
1153 | assert(addr); | |
1154 | assert(port > 0); | |
74b2466e LP |
1155 | assert(p); |
1156 | ||
74b2466e LP |
1157 | iov.iov_base = DNS_PACKET_DATA(p); |
1158 | iov.iov_len = p->size; | |
1159 | ||
1716f6dc LP |
1160 | sa.in6.sin6_addr = *addr; |
1161 | sa.in6.sin6_port = htobe16(port), | |
74b2466e LP |
1162 | sa.in6.sin6_scope_id = ifindex; |
1163 | ||
1164 | mh.msg_iov = &iov; | |
1165 | mh.msg_iovlen = 1; | |
1166 | mh.msg_name = &sa.sa; | |
1167 | mh.msg_namelen = sizeof(sa.in6); | |
1168 | ||
1169 | if (ifindex > 0) { | |
1170 | struct cmsghdr *cmsg; | |
1171 | struct in6_pktinfo *pi; | |
1172 | ||
1173 | zero(control); | |
1174 | ||
1716f6dc | 1175 | mh.msg_control = &control; |
74b2466e LP |
1176 | mh.msg_controllen = CMSG_LEN(sizeof(struct in6_pktinfo)); |
1177 | ||
1178 | cmsg = CMSG_FIRSTHDR(&mh); | |
1179 | cmsg->cmsg_len = mh.msg_controllen; | |
1180 | cmsg->cmsg_level = IPPROTO_IPV6; | |
1181 | cmsg->cmsg_type = IPV6_PKTINFO; | |
1182 | ||
1183 | pi = (struct in6_pktinfo*) CMSG_DATA(cmsg); | |
1184 | pi->ipi6_ifindex = ifindex; | |
1185 | } | |
1186 | ||
1187 | return sendmsg_loop(fd, &mh, 0); | |
1188 | } | |
1189 | ||
623a4c97 | 1190 | int manager_send(Manager *m, int fd, int ifindex, int family, const union in_addr_union *addr, uint16_t port, DnsPacket *p) { |
1716f6dc LP |
1191 | assert(m); |
1192 | assert(fd >= 0); | |
1193 | assert(addr); | |
1194 | assert(port > 0); | |
1195 | assert(p); | |
1196 | ||
a2a416f7 LP |
1197 | 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)); |
1198 | ||
1716f6dc LP |
1199 | if (family == AF_INET) |
1200 | return manager_ipv4_send(m, fd, ifindex, &addr->in, port, p); | |
1201 | else if (family == AF_INET6) | |
1202 | return manager_ipv6_send(m, fd, ifindex, &addr->in6, port, p); | |
1203 | ||
1204 | return -EAFNOSUPPORT; | |
1205 | } | |
1206 | ||
2c27fbca | 1207 | DnsServer* manager_find_dns_server(Manager *m, int family, const union in_addr_union *in_addr) { |
74b2466e LP |
1208 | DnsServer *s; |
1209 | ||
1210 | assert(m); | |
1211 | assert(in_addr); | |
1212 | ||
4e945a6f | 1213 | LIST_FOREACH(servers, s, m->dns_servers) |
5cb36f41 | 1214 | if (s->family == family && in_addr_equal(family, &s->address, in_addr) > 0) |
2c27fbca | 1215 | return s; |
74b2466e | 1216 | |
4e945a6f | 1217 | LIST_FOREACH(servers, s, m->fallback_dns_servers) |
5cb36f41 | 1218 | if (s->family == family && in_addr_equal(family, &s->address, in_addr) > 0) |
2c27fbca | 1219 | return s; |
74b2466e | 1220 | |
2c27fbca | 1221 | return NULL; |
4e945a6f LP |
1222 | } |
1223 | ||
2c27fbca | 1224 | DnsServer *manager_set_dns_server(Manager *m, DnsServer *s) { |
4e945a6f LP |
1225 | assert(m); |
1226 | ||
1227 | if (m->current_dns_server == s) | |
1228 | return s; | |
1229 | ||
1230 | if (s) { | |
1231 | _cleanup_free_ char *ip = NULL; | |
1232 | ||
1233 | in_addr_to_string(s->family, &s->address, &ip); | |
1234 | log_info("Switching to system DNS server %s.", strna(ip)); | |
2c27fbca | 1235 | } |
4e945a6f LP |
1236 | |
1237 | m->current_dns_server = s; | |
2c27fbca LP |
1238 | |
1239 | if (m->unicast_scope) | |
1240 | dns_cache_flush(&m->unicast_scope->cache); | |
1241 | ||
4e945a6f | 1242 | return s; |
74b2466e LP |
1243 | } |
1244 | ||
1245 | DnsServer *manager_get_dns_server(Manager *m) { | |
4e945a6f | 1246 | Link *l; |
74b2466e LP |
1247 | assert(m); |
1248 | ||
5cb36f41 LP |
1249 | /* Try to read updates resolv.conf */ |
1250 | manager_read_resolv_conf(m); | |
1251 | ||
74b2466e | 1252 | if (!m->current_dns_server) |
4e945a6f LP |
1253 | manager_set_dns_server(m, m->dns_servers); |
1254 | ||
1255 | if (!m->current_dns_server) { | |
1256 | bool found = false; | |
1257 | Iterator i; | |
1258 | ||
1259 | /* No DNS servers configured, let's see if there are | |
1260 | * any on any links. If not, we use the fallback | |
1261 | * servers */ | |
1262 | ||
1263 | HASHMAP_FOREACH(l, m->links, i) | |
1264 | if (l->dns_servers) { | |
1265 | found = true; | |
1266 | break; | |
1267 | } | |
1268 | ||
1269 | if (!found) | |
1270 | manager_set_dns_server(m, m->fallback_dns_servers); | |
1271 | } | |
74b2466e LP |
1272 | |
1273 | return m->current_dns_server; | |
1274 | } | |
1275 | ||
1276 | void manager_next_dns_server(Manager *m) { | |
1277 | assert(m); | |
1278 | ||
4e945a6f LP |
1279 | /* If there's currently no DNS server set, then the next |
1280 | * manager_get_dns_server() will find one */ | |
74b2466e LP |
1281 | if (!m->current_dns_server) |
1282 | return; | |
1283 | ||
4e945a6f | 1284 | /* Change to the next one */ |
74b2466e | 1285 | if (m->current_dns_server->servers_next) { |
4e945a6f | 1286 | manager_set_dns_server(m, m->current_dns_server->servers_next); |
74b2466e LP |
1287 | return; |
1288 | } | |
1289 | ||
4e945a6f LP |
1290 | /* If there was no next one, then start from the beginning of |
1291 | * the list */ | |
1292 | if (m->current_dns_server->type == DNS_SERVER_FALLBACK) | |
1293 | manager_set_dns_server(m, m->fallback_dns_servers); | |
1294 | else | |
1295 | manager_set_dns_server(m, m->dns_servers); | |
091a364c | 1296 | } |
e1c95994 LP |
1297 | |
1298 | uint32_t manager_find_mtu(Manager *m) { | |
1299 | uint32_t mtu = 0; | |
1300 | Link *l; | |
1301 | Iterator i; | |
1302 | ||
1303 | /* If we don't know on which link a DNS packet would be | |
1304 | * delivered, let's find the largest MTU that works on all | |
1305 | * interfaces we know of */ | |
1306 | ||
1307 | HASHMAP_FOREACH(l, m->links, i) { | |
1308 | if (l->mtu <= 0) | |
1309 | continue; | |
1310 | ||
1311 | if (mtu <= 0 || l->mtu < mtu) | |
1312 | mtu = l->mtu; | |
1313 | } | |
1314 | ||
1315 | return mtu; | |
1316 | } | |
1716f6dc LP |
1317 | |
1318 | static int on_llmnr_packet(sd_event_source *s, int fd, uint32_t revents, void *userdata) { | |
1319 | _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL; | |
ec2c5e43 | 1320 | DnsTransaction *t = NULL; |
1716f6dc | 1321 | Manager *m = userdata; |
a4076574 | 1322 | DnsScope *scope; |
1716f6dc LP |
1323 | int r; |
1324 | ||
1325 | r = manager_recv(m, fd, DNS_PROTOCOL_LLMNR, &p); | |
1326 | if (r <= 0) | |
1327 | return r; | |
1328 | ||
a4076574 LP |
1329 | scope = manager_find_scope(m, p); |
1330 | if (!scope) { | |
1331 | log_warning("Got LLMNR UDP packet on unknown scope. Ignoring."); | |
1332 | return 0; | |
1333 | } | |
1334 | ||
623a4c97 | 1335 | if (dns_packet_validate_reply(p) > 0) { |
a2a416f7 LP |
1336 | log_debug("Got reply packet for id %u", DNS_PACKET_ID(p)); |
1337 | ||
a4076574 | 1338 | dns_scope_check_conflicts(scope, p); |
623a4c97 | 1339 | |
a4076574 LP |
1340 | t = hashmap_get(m->dns_transactions, UINT_TO_PTR(DNS_PACKET_ID(p))); |
1341 | if (t) | |
1342 | dns_transaction_process_reply(t, p); | |
623a4c97 | 1343 | |
a4076574 LP |
1344 | } else if (dns_packet_validate_query(p) > 0) { |
1345 | log_debug("Got query packet for id %u", DNS_PACKET_ID(p)); | |
623a4c97 | 1346 | |
a4076574 | 1347 | dns_scope_process_query(scope, NULL, p); |
623a4c97 | 1348 | } else |
a4076574 | 1349 | log_debug("Invalid LLMNR UDP packet."); |
1716f6dc LP |
1350 | |
1351 | return 0; | |
1352 | } | |
1353 | ||
1354 | int manager_llmnr_ipv4_udp_fd(Manager *m) { | |
1355 | union sockaddr_union sa = { | |
1356 | .in.sin_family = AF_INET, | |
1357 | .in.sin_port = htobe16(5355), | |
1358 | }; | |
bf3f1271 | 1359 | static const int one = 1, pmtu = IP_PMTUDISC_DONT, ttl = 255; |
1716f6dc LP |
1360 | int r; |
1361 | ||
1362 | assert(m); | |
1363 | ||
1364 | if (m->llmnr_ipv4_udp_fd >= 0) | |
1365 | return m->llmnr_ipv4_udp_fd; | |
1366 | ||
1367 | m->llmnr_ipv4_udp_fd = socket(AF_INET, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); | |
1368 | if (m->llmnr_ipv4_udp_fd < 0) | |
1369 | return -errno; | |
1370 | ||
bf3f1271 LP |
1371 | /* RFC 4795, section 2.5 recommends setting the TTL of UDP packets to 255. */ |
1372 | r = setsockopt(m->llmnr_ipv4_udp_fd, IPPROTO_IP, IP_TTL, &ttl, sizeof(ttl)); | |
1716f6dc LP |
1373 | if (r < 0) { |
1374 | r = -errno; | |
1375 | goto fail; | |
1376 | } | |
1377 | ||
bf3f1271 | 1378 | r = setsockopt(m->llmnr_ipv4_udp_fd, IPPROTO_IP, IP_MULTICAST_TTL, &ttl, sizeof(ttl)); |
1716f6dc LP |
1379 | if (r < 0) { |
1380 | r = -errno; | |
1381 | goto fail; | |
1382 | } | |
1383 | ||
1384 | r = setsockopt(m->llmnr_ipv4_udp_fd, IPPROTO_IP, IP_MULTICAST_LOOP, &one, sizeof(one)); | |
1385 | if (r < 0) { | |
1386 | r = -errno; | |
1387 | goto fail; | |
1388 | } | |
1389 | ||
1390 | r = setsockopt(m->llmnr_ipv4_udp_fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)); | |
1391 | if (r < 0) { | |
1392 | r = -errno; | |
1393 | goto fail; | |
1394 | } | |
1395 | ||
1396 | r = setsockopt(m->llmnr_ipv4_udp_fd, IPPROTO_IP, IP_PKTINFO, &one, sizeof(one)); | |
1397 | if (r < 0) { | |
1398 | r = -errno; | |
1399 | goto fail; | |
1400 | } | |
1401 | ||
1402 | r = setsockopt(m->llmnr_ipv4_udp_fd, IPPROTO_IP, IP_RECVTTL, &one, sizeof(one)); | |
1403 | if (r < 0) { | |
1404 | r = -errno; | |
1405 | goto fail; | |
1406 | } | |
1407 | ||
1408 | /* Disable Don't-Fragment bit in the IP header */ | |
1409 | r = setsockopt(m->llmnr_ipv4_udp_fd, IPPROTO_IP, IP_MTU_DISCOVER, &pmtu, sizeof(pmtu)); | |
1410 | if (r < 0) { | |
1411 | r = -errno; | |
1412 | goto fail; | |
1413 | } | |
1414 | ||
1415 | r = bind(m->llmnr_ipv4_udp_fd, &sa.sa, sizeof(sa.in)); | |
1416 | if (r < 0) { | |
1417 | r = -errno; | |
1418 | goto fail; | |
1419 | } | |
1420 | ||
1421 | r = sd_event_add_io(m->event, &m->llmnr_ipv4_udp_event_source, m->llmnr_ipv4_udp_fd, EPOLLIN, on_llmnr_packet, m); | |
1422 | if (r < 0) | |
1423 | goto fail; | |
1424 | ||
1425 | return m->llmnr_ipv4_udp_fd; | |
1426 | ||
1427 | fail: | |
1428 | m->llmnr_ipv4_udp_fd = safe_close(m->llmnr_ipv4_udp_fd); | |
1429 | return r; | |
1430 | } | |
1431 | ||
1432 | int manager_llmnr_ipv6_udp_fd(Manager *m) { | |
1433 | union sockaddr_union sa = { | |
1434 | .in6.sin6_family = AF_INET6, | |
1435 | .in6.sin6_port = htobe16(5355), | |
1436 | }; | |
bf3f1271 | 1437 | static const int one = 1, ttl = 255; |
1716f6dc LP |
1438 | int r; |
1439 | ||
1440 | assert(m); | |
1441 | ||
1442 | if (m->llmnr_ipv6_udp_fd >= 0) | |
1443 | return m->llmnr_ipv6_udp_fd; | |
1444 | ||
1445 | m->llmnr_ipv6_udp_fd = socket(AF_INET6, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); | |
1446 | if (m->llmnr_ipv6_udp_fd < 0) | |
1447 | return -errno; | |
1448 | ||
bf3f1271 | 1449 | r = setsockopt(m->llmnr_ipv6_udp_fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &ttl, sizeof(ttl)); |
1716f6dc LP |
1450 | if (r < 0) { |
1451 | r = -errno; | |
1452 | goto fail; | |
1453 | } | |
1454 | ||
bf3f1271 LP |
1455 | /* RFC 4795, section 2.5 recommends setting the TTL of UDP packets to 255. */ |
1456 | r = setsockopt(m->llmnr_ipv6_udp_fd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &ttl, sizeof(ttl)); | |
1716f6dc LP |
1457 | if (r < 0) { |
1458 | r = -errno; | |
1459 | goto fail; | |
1460 | } | |
1461 | ||
1462 | r = setsockopt(m->llmnr_ipv6_udp_fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &one, sizeof(one)); | |
1463 | if (r < 0) { | |
1464 | r = -errno; | |
1465 | goto fail; | |
1466 | } | |
1467 | ||
1468 | r = setsockopt(m->llmnr_ipv6_udp_fd, IPPROTO_IPV6, IPV6_V6ONLY, &one, sizeof(one)); | |
1469 | if (r < 0) { | |
1470 | r = -errno; | |
1471 | goto fail; | |
1472 | } | |
1473 | ||
1474 | r = setsockopt(m->llmnr_ipv6_udp_fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)); | |
1475 | if (r < 0) { | |
1476 | r = -errno; | |
1477 | goto fail; | |
1478 | } | |
1479 | ||
1480 | r = setsockopt(m->llmnr_ipv6_udp_fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, &one, sizeof(one)); | |
1481 | if (r < 0) { | |
1482 | r = -errno; | |
1483 | goto fail; | |
1484 | } | |
1485 | ||
1486 | r = setsockopt(m->llmnr_ipv6_udp_fd, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &one, sizeof(one)); | |
1487 | if (r < 0) { | |
1488 | r = -errno; | |
1489 | goto fail; | |
1490 | } | |
1491 | ||
1492 | r = bind(m->llmnr_ipv6_udp_fd, &sa.sa, sizeof(sa.in6)); | |
1493 | if (r < 0) { | |
1494 | r = -errno; | |
1495 | goto fail; | |
1496 | } | |
1497 | ||
1498 | r = sd_event_add_io(m->event, &m->llmnr_ipv6_udp_event_source, m->llmnr_ipv6_udp_fd, EPOLLIN, on_llmnr_packet, m); | |
1499 | if (r < 0) { | |
1500 | r = -errno; | |
1501 | goto fail; | |
1502 | } | |
1503 | ||
1504 | return m->llmnr_ipv6_udp_fd; | |
1505 | ||
1506 | fail: | |
1507 | m->llmnr_ipv6_udp_fd = safe_close(m->llmnr_ipv6_udp_fd); | |
1508 | return r; | |
1509 | } | |
623a4c97 LP |
1510 | |
1511 | static int on_llmnr_stream_packet(DnsStream *s) { | |
a4076574 | 1512 | DnsScope *scope; |
623a4c97 | 1513 | |
a4076574 | 1514 | assert(s); |
623a4c97 | 1515 | |
a4076574 LP |
1516 | scope = manager_find_scope(s->manager, s->read_packet); |
1517 | if (!scope) { | |
1518 | log_warning("Got LLMNR TCP packet on unknown scope. Ignroing."); | |
1519 | return 0; | |
1520 | } | |
623a4c97 | 1521 | |
a4076574 LP |
1522 | if (dns_packet_validate_query(s->read_packet) > 0) { |
1523 | log_debug("Got query packet for id %u", DNS_PACKET_ID(s->read_packet)); | |
623a4c97 | 1524 | |
a4076574 | 1525 | dns_scope_process_query(scope, s, s->read_packet); |
623a4c97 | 1526 | |
a4076574 LP |
1527 | /* If no reply packet was set, we free the stream */ |
1528 | if (s->write_packet) | |
1529 | return 0; | |
1530 | } else | |
1531 | log_debug("Invalid LLMNR TCP packet."); | |
623a4c97 LP |
1532 | |
1533 | dns_stream_free(s); | |
1534 | return 0; | |
1535 | } | |
1536 | ||
1537 | static int on_llmnr_stream(sd_event_source *s, int fd, uint32_t revents, void *userdata) { | |
1538 | DnsStream *stream; | |
1539 | Manager *m = userdata; | |
1540 | int cfd, r; | |
1541 | ||
1542 | cfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC); | |
1543 | if (cfd < 0) { | |
1544 | if (errno == EAGAIN || errno == EINTR) | |
1545 | return 0; | |
1546 | ||
1547 | return -errno; | |
1548 | } | |
1549 | ||
1550 | r = dns_stream_new(m, &stream, DNS_PROTOCOL_LLMNR, cfd); | |
1551 | if (r < 0) { | |
1552 | safe_close(cfd); | |
1553 | return r; | |
1554 | } | |
1555 | ||
1556 | stream->on_packet = on_llmnr_stream_packet; | |
1557 | return 0; | |
1558 | } | |
1559 | ||
1560 | int manager_llmnr_ipv4_tcp_fd(Manager *m) { | |
1561 | union sockaddr_union sa = { | |
1562 | .in.sin_family = AF_INET, | |
1563 | .in.sin_port = htobe16(5355), | |
1564 | }; | |
1565 | static const int one = 1, pmtu = IP_PMTUDISC_DONT; | |
1566 | int r; | |
1567 | ||
1568 | assert(m); | |
1569 | ||
1570 | if (m->llmnr_ipv4_tcp_fd >= 0) | |
1571 | return m->llmnr_ipv4_tcp_fd; | |
1572 | ||
1573 | m->llmnr_ipv4_tcp_fd = socket(AF_INET, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); | |
1574 | if (m->llmnr_ipv4_tcp_fd < 0) | |
1575 | return -errno; | |
1576 | ||
bf3f1271 | 1577 | /* RFC 4795, section 2.5. requires setting the TTL of TCP streams to 1 */ |
623a4c97 LP |
1578 | r = setsockopt(m->llmnr_ipv4_tcp_fd, IPPROTO_IP, IP_TTL, &one, sizeof(one)); |
1579 | if (r < 0) { | |
1580 | r = -errno; | |
1581 | goto fail; | |
1582 | } | |
1583 | ||
1584 | r = setsockopt(m->llmnr_ipv4_tcp_fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)); | |
1585 | if (r < 0) { | |
1586 | r = -errno; | |
1587 | goto fail; | |
1588 | } | |
1589 | ||
1590 | r = setsockopt(m->llmnr_ipv4_tcp_fd, IPPROTO_IP, IP_PKTINFO, &one, sizeof(one)); | |
1591 | if (r < 0) { | |
1592 | r = -errno; | |
1593 | goto fail; | |
1594 | } | |
1595 | ||
1596 | r = setsockopt(m->llmnr_ipv4_tcp_fd, IPPROTO_IP, IP_RECVTTL, &one, sizeof(one)); | |
1597 | if (r < 0) { | |
1598 | r = -errno; | |
1599 | goto fail; | |
1600 | } | |
1601 | ||
1602 | /* Disable Don't-Fragment bit in the IP header */ | |
1603 | r = setsockopt(m->llmnr_ipv4_tcp_fd, IPPROTO_IP, IP_MTU_DISCOVER, &pmtu, sizeof(pmtu)); | |
1604 | if (r < 0) { | |
1605 | r = -errno; | |
1606 | goto fail; | |
1607 | } | |
1608 | ||
1609 | r = bind(m->llmnr_ipv4_tcp_fd, &sa.sa, sizeof(sa.in)); | |
1610 | if (r < 0) { | |
1611 | r = -errno; | |
1612 | goto fail; | |
1613 | } | |
1614 | ||
1615 | r = listen(m->llmnr_ipv4_tcp_fd, SOMAXCONN); | |
1616 | if (r < 0) { | |
1617 | r = -errno; | |
1618 | goto fail; | |
1619 | } | |
1620 | ||
1621 | r = sd_event_add_io(m->event, &m->llmnr_ipv4_tcp_event_source, m->llmnr_ipv4_tcp_fd, EPOLLIN, on_llmnr_stream, m); | |
1622 | if (r < 0) | |
1623 | goto fail; | |
1624 | ||
1625 | return m->llmnr_ipv4_tcp_fd; | |
1626 | ||
1627 | fail: | |
1628 | m->llmnr_ipv4_tcp_fd = safe_close(m->llmnr_ipv4_tcp_fd); | |
1629 | return r; | |
1630 | } | |
1631 | ||
1632 | int manager_llmnr_ipv6_tcp_fd(Manager *m) { | |
1633 | union sockaddr_union sa = { | |
1634 | .in6.sin6_family = AF_INET6, | |
1635 | .in6.sin6_port = htobe16(5355), | |
1636 | }; | |
1637 | static const int one = 1; | |
1638 | int r; | |
1639 | ||
1640 | assert(m); | |
1641 | ||
1642 | if (m->llmnr_ipv6_tcp_fd >= 0) | |
1643 | return m->llmnr_ipv6_tcp_fd; | |
1644 | ||
1645 | m->llmnr_ipv6_tcp_fd = socket(AF_INET6, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); | |
1646 | if (m->llmnr_ipv6_tcp_fd < 0) | |
1647 | return -errno; | |
1648 | ||
bf3f1271 | 1649 | /* RFC 4795, section 2.5. requires setting the TTL of TCP streams to 1 */ |
623a4c97 LP |
1650 | r = setsockopt(m->llmnr_ipv6_tcp_fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &one, sizeof(one)); |
1651 | if (r < 0) { | |
1652 | r = -errno; | |
1653 | goto fail; | |
1654 | } | |
1655 | ||
1656 | r = setsockopt(m->llmnr_ipv6_tcp_fd, IPPROTO_IPV6, IPV6_V6ONLY, &one, sizeof(one)); | |
1657 | if (r < 0) { | |
1658 | r = -errno; | |
1659 | goto fail; | |
1660 | } | |
1661 | ||
1662 | r = setsockopt(m->llmnr_ipv6_tcp_fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)); | |
1663 | if (r < 0) { | |
1664 | r = -errno; | |
1665 | goto fail; | |
1666 | } | |
1667 | ||
1668 | r = setsockopt(m->llmnr_ipv6_tcp_fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, &one, sizeof(one)); | |
1669 | if (r < 0) { | |
1670 | r = -errno; | |
1671 | goto fail; | |
1672 | } | |
1673 | ||
1674 | r = setsockopt(m->llmnr_ipv6_tcp_fd, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &one, sizeof(one)); | |
1675 | if (r < 0) { | |
1676 | r = -errno; | |
1677 | goto fail; | |
1678 | } | |
1679 | ||
1680 | r = bind(m->llmnr_ipv6_tcp_fd, &sa.sa, sizeof(sa.in6)); | |
1681 | if (r < 0) { | |
1682 | r = -errno; | |
1683 | goto fail; | |
1684 | } | |
1685 | ||
1686 | r = listen(m->llmnr_ipv6_tcp_fd, SOMAXCONN); | |
1687 | if (r < 0) { | |
1688 | r = -errno; | |
1689 | goto fail; | |
1690 | } | |
1691 | ||
1692 | r = sd_event_add_io(m->event, &m->llmnr_ipv6_tcp_event_source, m->llmnr_ipv6_tcp_fd, EPOLLIN, on_llmnr_stream, m); | |
1693 | if (r < 0) { | |
1694 | r = -errno; | |
1695 | goto fail; | |
1696 | } | |
1697 | ||
1698 | return m->llmnr_ipv6_tcp_fd; | |
1699 | ||
1700 | fail: | |
1701 | m->llmnr_ipv6_tcp_fd = safe_close(m->llmnr_ipv6_tcp_fd); | |
1702 | return r; | |
1703 | } | |
1704 | ||
623a4c97 | 1705 | int manager_find_ifindex(Manager *m, int family, const union in_addr_union *in_addr) { |
ec2c5e43 LP |
1706 | LinkAddress *a; |
1707 | ||
1708 | assert(m); | |
1709 | ||
4e945a6f | 1710 | a = manager_find_link_address(m, family, in_addr); |
ec2c5e43 LP |
1711 | if (a) |
1712 | return a->link->ifindex; | |
1713 | ||
1714 | return 0; | |
1715 | } | |
1716 | ||
eb60f9cd LP |
1717 | void manager_refresh_rrs(Manager *m) { |
1718 | Iterator i; | |
1719 | Link *l; | |
1720 | ||
1721 | assert(m); | |
1722 | ||
1723 | m->host_ipv4_key = dns_resource_key_unref(m->host_ipv4_key); | |
1724 | m->host_ipv6_key = dns_resource_key_unref(m->host_ipv6_key); | |
1725 | ||
1726 | HASHMAP_FOREACH(l, m->links, i) { | |
1727 | link_add_rrs(l, true); | |
1728 | link_add_rrs(l, false); | |
1729 | } | |
1730 | } | |
1731 | ||
ec2c5e43 LP |
1732 | int manager_next_hostname(Manager *m) { |
1733 | const char *p; | |
556a2294 | 1734 | uint64_t u, a; |
ec2c5e43 | 1735 | char *h; |
623a4c97 LP |
1736 | |
1737 | assert(m); | |
1738 | ||
ec2c5e43 LP |
1739 | p = strchr(m->hostname, 0); |
1740 | assert(p); | |
1741 | ||
1742 | while (p > m->hostname) { | |
1743 | if (!strchr("0123456789", p[-1])) | |
1744 | break; | |
1745 | ||
1746 | p--; | |
1747 | } | |
1748 | ||
1749 | if (*p == 0 || safe_atou64(p, &u) < 0 || u <= 0) | |
1750 | u = 1; | |
1751 | ||
556a2294 LP |
1752 | /* Add a random number to the old value. This way we can avoid |
1753 | * that two hosts pick the same hostname, win on IPv4 and lose | |
1754 | * on IPv6 (or vice versa), and pick the same hostname | |
1755 | * replacement hostname, ad infinitum. We still want the | |
1756 | * numbers to go up monotonically, hence we just add a random | |
1757 | * value 1..10 */ | |
1758 | ||
1759 | random_bytes(&a, sizeof(a)); | |
1760 | u += 1 + a % 10; | |
ec2c5e43 LP |
1761 | |
1762 | if (asprintf(&h, "%.*s%" PRIu64, (int) (p - m->hostname), m->hostname, u) < 0) | |
1763 | return -ENOMEM; | |
1764 | ||
eb60f9cd | 1765 | log_info("Hostname conflict, changing published hostname from '%s' to '%s'.", m->hostname, h); |
ec2c5e43 LP |
1766 | |
1767 | free(m->hostname); | |
1768 | m->hostname = h; | |
1769 | ||
eb60f9cd | 1770 | manager_refresh_rrs(m); |
623a4c97 LP |
1771 | |
1772 | return 0; | |
1773 | } | |
ec2c5e43 | 1774 | |
4e945a6f | 1775 | LinkAddress* manager_find_link_address(Manager *m, int family, const union in_addr_union *in_addr) { |
ec2c5e43 LP |
1776 | Iterator i; |
1777 | Link *l; | |
1778 | ||
1779 | assert(m); | |
1780 | ||
1781 | HASHMAP_FOREACH(l, m->links, i) { | |
1782 | LinkAddress *a; | |
1783 | ||
1784 | a = link_find_address(l, family, in_addr); | |
1785 | if (a) | |
1786 | return a; | |
1787 | } | |
1788 | ||
1789 | return NULL; | |
1790 | } | |
1791 | ||
a4076574 | 1792 | bool manager_our_packet(Manager *m, DnsPacket *p) { |
ec2c5e43 LP |
1793 | assert(m); |
1794 | assert(p); | |
1795 | ||
4e945a6f | 1796 | return !!manager_find_link_address(m, p->family, &p->sender); |
ec2c5e43 | 1797 | } |
4e945a6f | 1798 | |
a4076574 LP |
1799 | DnsScope* manager_find_scope(Manager *m, DnsPacket *p) { |
1800 | Link *l; | |
1801 | ||
1802 | assert(m); | |
1803 | assert(p); | |
1804 | ||
1805 | l = hashmap_get(m->links, INT_TO_PTR(p->ifindex)); | |
1806 | if (!l) | |
1807 | return NULL; | |
1808 | ||
1809 | if (p->protocol == DNS_PROTOCOL_LLMNR) { | |
1810 | if (p->family == AF_INET) | |
1811 | return l->llmnr_ipv4_scope; | |
1812 | else if (p->family == AF_INET6) | |
1813 | return l->llmnr_ipv6_scope; | |
1814 | } | |
1815 | ||
1816 | return NULL; | |
1817 | } | |
1818 | ||
902bb5d8 LP |
1819 | void manager_verify_all(Manager *m) { |
1820 | DnsScope *s; | |
1821 | ||
1822 | assert(m); | |
1823 | ||
1824 | LIST_FOREACH(scopes, s, m->dns_scopes) | |
1825 | dns_zone_verify_all(&s->zone); | |
1826 | } | |
1827 | ||
3e684349 LP |
1828 | void manager_flush_dns_servers(Manager *m, DnsServerType t) { |
1829 | assert(m); | |
1830 | ||
1831 | if (t == DNS_SERVER_SYSTEM) | |
1832 | while (m->dns_servers) | |
1833 | dns_server_free(m->dns_servers); | |
1834 | ||
1835 | if (t == DNS_SERVER_FALLBACK) | |
1836 | while (m->fallback_dns_servers) | |
1837 | dns_server_free(m->fallback_dns_servers); | |
1838 | } | |
1839 | ||
4e945a6f LP |
1840 | static const char* const support_table[_SUPPORT_MAX] = { |
1841 | [SUPPORT_NO] = "no", | |
1842 | [SUPPORT_YES] = "yes", | |
1843 | [SUPPORT_RESOLVE] = "resolve", | |
1844 | }; | |
1845 | DEFINE_STRING_TABLE_LOOKUP(support, Support); |