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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" |
958b66ea | 35 | #include "hostname-util.h" |
4e945a6f | 36 | |
eb60f9cd | 37 | #include "resolved-dns-domain.h" |
39d8db04 LP |
38 | #include "resolved-conf.h" |
39 | #include "resolved-bus.h" | |
40 | #include "resolved-manager.h" | |
74b2466e LP |
41 | |
42 | #define SEND_TIMEOUT_USEC (200 * USEC_PER_MSEC) | |
43 | ||
44 | static int manager_process_link(sd_rtnl *rtnl, sd_rtnl_message *mm, void *userdata) { | |
45 | Manager *m = userdata; | |
46 | uint16_t type; | |
47 | Link *l; | |
48 | int ifindex, r; | |
49 | ||
50 | assert(rtnl); | |
51 | assert(m); | |
52 | assert(mm); | |
53 | ||
54 | r = sd_rtnl_message_get_type(mm, &type); | |
55 | if (r < 0) | |
56 | goto fail; | |
57 | ||
58 | r = sd_rtnl_message_link_get_ifindex(mm, &ifindex); | |
59 | if (r < 0) | |
60 | goto fail; | |
61 | ||
62 | l = hashmap_get(m->links, INT_TO_PTR(ifindex)); | |
63 | ||
64 | switch (type) { | |
65 | ||
a2a416f7 LP |
66 | case RTM_NEWLINK:{ |
67 | bool is_new = !l; | |
74b2466e | 68 | |
a2a416f7 | 69 | if (!l) { |
74b2466e LP |
70 | r = link_new(m, &l, ifindex); |
71 | if (r < 0) | |
72 | goto fail; | |
73 | } | |
74 | ||
75 | r = link_update_rtnl(l, mm); | |
76 | if (r < 0) | |
77 | goto fail; | |
78 | ||
21d73c87 LP |
79 | r = link_update_monitor(l); |
80 | if (r < 0) | |
81 | goto fail; | |
82 | ||
a2a416f7 LP |
83 | if (is_new) |
84 | log_debug("Found new link %i/%s", ifindex, l->name); | |
85 | ||
74b2466e | 86 | break; |
a2a416f7 | 87 | } |
74b2466e LP |
88 | |
89 | case RTM_DELLINK: | |
90 | if (l) { | |
a2a416f7 | 91 | log_debug("Removing link %i/%s", l->ifindex, l->name); |
74b2466e LP |
92 | link_free(l); |
93 | } | |
94 | ||
95 | break; | |
96 | } | |
97 | ||
98 | return 0; | |
99 | ||
100 | fail: | |
da927ba9 | 101 | log_warning_errno(r, "Failed to process RTNL link message: %m"); |
74b2466e LP |
102 | return 0; |
103 | } | |
104 | ||
105 | static int manager_process_address(sd_rtnl *rtnl, sd_rtnl_message *mm, void *userdata) { | |
106 | Manager *m = userdata; | |
107 | union in_addr_union address; | |
74b2466e | 108 | uint16_t type; |
0dd25fb9 | 109 | int r, ifindex, family; |
74b2466e LP |
110 | LinkAddress *a; |
111 | Link *l; | |
112 | ||
113 | assert(rtnl); | |
114 | assert(mm); | |
115 | assert(m); | |
116 | ||
117 | r = sd_rtnl_message_get_type(mm, &type); | |
118 | if (r < 0) | |
119 | goto fail; | |
120 | ||
121 | r = sd_rtnl_message_addr_get_ifindex(mm, &ifindex); | |
122 | if (r < 0) | |
123 | goto fail; | |
124 | ||
125 | l = hashmap_get(m->links, INT_TO_PTR(ifindex)); | |
126 | if (!l) | |
127 | return 0; | |
128 | ||
129 | r = sd_rtnl_message_addr_get_family(mm, &family); | |
130 | if (r < 0) | |
131 | goto fail; | |
132 | ||
133 | switch (family) { | |
134 | ||
135 | case AF_INET: | |
136 | r = sd_rtnl_message_read_in_addr(mm, IFA_LOCAL, &address.in); | |
137 | if (r < 0) { | |
138 | r = sd_rtnl_message_read_in_addr(mm, IFA_ADDRESS, &address.in); | |
139 | if (r < 0) | |
140 | goto fail; | |
141 | } | |
142 | ||
143 | break; | |
144 | ||
145 | case AF_INET6: | |
146 | r = sd_rtnl_message_read_in6_addr(mm, IFA_LOCAL, &address.in6); | |
147 | if (r < 0) { | |
148 | r = sd_rtnl_message_read_in6_addr(mm, IFA_ADDRESS, &address.in6); | |
149 | if (r < 0) | |
150 | goto fail; | |
151 | } | |
152 | ||
153 | break; | |
154 | ||
155 | default: | |
156 | return 0; | |
157 | } | |
158 | ||
159 | a = link_find_address(l, family, &address); | |
160 | ||
161 | switch (type) { | |
162 | ||
163 | case RTM_NEWADDR: | |
164 | ||
165 | if (!a) { | |
166 | r = link_address_new(l, &a, family, &address); | |
167 | if (r < 0) | |
168 | return r; | |
169 | } | |
170 | ||
171 | r = link_address_update_rtnl(a, mm); | |
172 | if (r < 0) | |
173 | return r; | |
174 | ||
175 | break; | |
176 | ||
177 | case RTM_DELADDR: | |
178 | if (a) | |
179 | link_address_free(a); | |
180 | break; | |
181 | } | |
182 | ||
183 | return 0; | |
184 | ||
185 | fail: | |
da927ba9 | 186 | log_warning_errno(r, "Failed to process RTNL address message: %m"); |
74b2466e LP |
187 | return 0; |
188 | } | |
189 | ||
74b2466e LP |
190 | static int manager_rtnl_listen(Manager *m) { |
191 | _cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL, *reply = NULL; | |
192 | sd_rtnl_message *i; | |
193 | int r; | |
194 | ||
195 | assert(m); | |
196 | ||
cc98b302 | 197 | /* First, subscribe to interfaces coming and going */ |
74b2466e LP |
198 | r = sd_rtnl_open(&m->rtnl, 3, RTNLGRP_LINK, RTNLGRP_IPV4_IFADDR, RTNLGRP_IPV6_IFADDR); |
199 | if (r < 0) | |
200 | return r; | |
201 | ||
202 | r = sd_rtnl_attach_event(m->rtnl, m->event, 0); | |
203 | if (r < 0) | |
204 | return r; | |
205 | ||
206 | r = sd_rtnl_add_match(m->rtnl, RTM_NEWLINK, manager_process_link, m); | |
207 | if (r < 0) | |
208 | return r; | |
209 | ||
210 | r = sd_rtnl_add_match(m->rtnl, RTM_DELLINK, manager_process_link, m); | |
211 | if (r < 0) | |
212 | return r; | |
213 | ||
214 | r = sd_rtnl_add_match(m->rtnl, RTM_NEWADDR, manager_process_address, m); | |
215 | if (r < 0) | |
216 | return r; | |
091a364c | 217 | |
74b2466e LP |
218 | r = sd_rtnl_add_match(m->rtnl, RTM_DELADDR, manager_process_address, m); |
219 | if (r < 0) | |
220 | return r; | |
221 | ||
222 | /* Then, enumerate all links */ | |
223 | r = sd_rtnl_message_new_link(m->rtnl, &req, RTM_GETLINK, 0); | |
224 | if (r < 0) | |
225 | return r; | |
226 | ||
227 | r = sd_rtnl_message_request_dump(req, true); | |
228 | if (r < 0) | |
229 | return r; | |
230 | ||
231 | r = sd_rtnl_call(m->rtnl, req, 0, &reply); | |
232 | if (r < 0) | |
233 | return r; | |
234 | ||
235 | for (i = reply; i; i = sd_rtnl_message_next(i)) { | |
236 | r = manager_process_link(m->rtnl, i, m); | |
237 | if (r < 0) | |
238 | return r; | |
239 | } | |
240 | ||
241 | req = sd_rtnl_message_unref(req); | |
242 | reply = sd_rtnl_message_unref(reply); | |
243 | ||
244 | /* Finally, enumerate all addresses, too */ | |
245 | r = sd_rtnl_message_new_addr(m->rtnl, &req, RTM_GETADDR, 0, AF_UNSPEC); | |
246 | if (r < 0) | |
247 | return r; | |
248 | ||
249 | r = sd_rtnl_message_request_dump(req, true); | |
250 | if (r < 0) | |
251 | return r; | |
252 | ||
253 | r = sd_rtnl_call(m->rtnl, req, 0, &reply); | |
254 | if (r < 0) | |
255 | return r; | |
256 | ||
257 | for (i = reply; i; i = sd_rtnl_message_next(i)) { | |
258 | r = manager_process_address(m->rtnl, i, m); | |
259 | if (r < 0) | |
260 | return r; | |
261 | } | |
262 | ||
263 | return r; | |
264 | } | |
265 | ||
266 | static int on_network_event(sd_event_source *s, int fd, uint32_t revents, void *userdata) { | |
267 | Manager *m = userdata; | |
268 | Iterator i; | |
269 | Link *l; | |
270 | int r; | |
271 | ||
272 | assert(m); | |
273 | ||
274 | sd_network_monitor_flush(m->network_monitor); | |
275 | ||
276 | HASHMAP_FOREACH(l, m->links, i) { | |
277 | r = link_update_monitor(l); | |
278 | if (r < 0) | |
da927ba9 | 279 | log_warning_errno(r, "Failed to update monitor information for %i: %m", l->ifindex); |
74b2466e LP |
280 | } |
281 | ||
282 | r = manager_write_resolv_conf(m); | |
283 | if (r < 0) | |
da927ba9 | 284 | log_warning_errno(r, "Could not update resolv.conf: %m"); |
74b2466e LP |
285 | |
286 | return 0; | |
287 | } | |
288 | ||
289 | static int manager_network_monitor_listen(Manager *m) { | |
290 | int r, fd, events; | |
291 | ||
292 | assert(m); | |
293 | ||
0014a4ad | 294 | r = sd_network_monitor_new(&m->network_monitor, NULL); |
74b2466e LP |
295 | if (r < 0) |
296 | return r; | |
297 | ||
298 | fd = sd_network_monitor_get_fd(m->network_monitor); | |
299 | if (fd < 0) | |
300 | return fd; | |
301 | ||
302 | events = sd_network_monitor_get_events(m->network_monitor); | |
303 | if (events < 0) | |
304 | return events; | |
305 | ||
306 | r = sd_event_add_io(m->event, &m->network_event_source, fd, events, &on_network_event, m); | |
307 | if (r < 0) | |
308 | return r; | |
309 | ||
310 | return 0; | |
311 | } | |
312 | ||
eb60f9cd LP |
313 | static int determine_hostname(char **ret) { |
314 | _cleanup_free_ char *h = NULL, *n = NULL; | |
315 | int r; | |
316 | ||
317 | assert(ret); | |
318 | ||
319 | h = gethostname_malloc(); | |
320 | if (!h) | |
321 | return log_oom(); | |
322 | ||
323 | if (!utf8_is_valid(h)) { | |
324 | log_error("System hostname is not UTF-8 clean."); | |
325 | return -EINVAL; | |
326 | } | |
327 | ||
328 | r = dns_name_normalize(h, &n); | |
329 | if (r < 0) { | |
330 | log_error("System hostname '%s' cannot be normalized.", h); | |
331 | return r; | |
332 | } | |
333 | ||
334 | *ret = n; | |
335 | n = NULL; | |
336 | ||
337 | return 0; | |
338 | } | |
339 | ||
340 | static int on_hostname_change(sd_event_source *es, int fd, uint32_t revents, void *userdata) { | |
341 | _cleanup_free_ char *h = NULL; | |
342 | Manager *m = userdata; | |
343 | int r; | |
344 | ||
345 | assert(m); | |
346 | ||
347 | r = determine_hostname(&h); | |
348 | if (r < 0) | |
349 | return 0; /* ignore invalid hostnames */ | |
350 | ||
351 | if (streq(h, m->hostname)) | |
352 | return 0; | |
353 | ||
354 | log_info("System hostname changed to '%s'.", h); | |
355 | free(m->hostname); | |
356 | m->hostname = h; | |
357 | h = NULL; | |
358 | ||
359 | manager_refresh_rrs(m); | |
360 | ||
361 | return 0; | |
362 | } | |
363 | ||
364 | static int manager_watch_hostname(Manager *m) { | |
eb60f9cd LP |
365 | int r; |
366 | ||
367 | assert(m); | |
368 | ||
369 | m->hostname_fd = open("/proc/sys/kernel/hostname", O_RDONLY|O_CLOEXEC|O_NDELAY|O_NOCTTY); | |
370 | if (m->hostname_fd < 0) { | |
56f64d95 | 371 | log_warning_errno(errno, "Failed to watch hostname: %m"); |
eb60f9cd LP |
372 | return 0; |
373 | } | |
374 | ||
375 | r = sd_event_add_io(m->event, &m->hostname_event_source, m->hostname_fd, 0, on_hostname_change, m); | |
376 | if (r < 0) { | |
377 | if (r == -EPERM) | |
378 | /* kernels prior to 3.2 don't support polling this file. Ignore the failure. */ | |
379 | m->hostname_fd = safe_close(m->hostname_fd); | |
8d3d7072 MS |
380 | else |
381 | return log_error_errno(r, "Failed to add hostname event source: %m"); | |
eb60f9cd LP |
382 | } |
383 | ||
384 | r = determine_hostname(&m->hostname); | |
385 | if (r < 0) { | |
386 | log_info("Defaulting to hostname 'linux'."); | |
387 | m->hostname = strdup("linux"); | |
388 | if (!m->hostname) | |
389 | return log_oom(); | |
390 | } else | |
391 | log_info("Using system hostname '%s'.", m->hostname); | |
392 | ||
393 | return 0; | |
394 | } | |
395 | ||
edc501d4 LP |
396 | static void manager_llmnr_stop(Manager *m) { |
397 | assert(m); | |
398 | ||
399 | m->llmnr_ipv4_udp_event_source = sd_event_source_unref(m->llmnr_ipv4_udp_event_source); | |
400 | m->llmnr_ipv4_udp_fd = safe_close(m->llmnr_ipv4_udp_fd); | |
401 | ||
402 | m->llmnr_ipv6_udp_event_source = sd_event_source_unref(m->llmnr_ipv6_udp_event_source); | |
403 | m->llmnr_ipv6_udp_fd = safe_close(m->llmnr_ipv6_udp_fd); | |
404 | ||
405 | m->llmnr_ipv4_tcp_event_source = sd_event_source_unref(m->llmnr_ipv4_tcp_event_source); | |
406 | m->llmnr_ipv4_tcp_fd = safe_close(m->llmnr_ipv4_tcp_fd); | |
407 | ||
408 | m->llmnr_ipv6_tcp_event_source = sd_event_source_unref(m->llmnr_ipv6_tcp_event_source); | |
409 | m->llmnr_ipv6_tcp_fd = safe_close(m->llmnr_ipv6_tcp_fd); | |
410 | } | |
411 | ||
412 | static int manager_llmnr_start(Manager *m) { | |
413 | int r; | |
414 | ||
415 | assert(m); | |
416 | ||
417 | if (m->llmnr_support == SUPPORT_NO) | |
418 | return 0; | |
419 | ||
420 | r = manager_llmnr_ipv4_udp_fd(m); | |
421 | if (r == -EADDRINUSE) | |
422 | goto eaddrinuse; | |
423 | if (r < 0) | |
424 | return r; | |
425 | ||
edc501d4 LP |
426 | r = manager_llmnr_ipv4_tcp_fd(m); |
427 | if (r == -EADDRINUSE) | |
428 | goto eaddrinuse; | |
429 | if (r < 0) | |
430 | return r; | |
431 | ||
90ab5042 LP |
432 | if (socket_ipv6_is_supported()) { |
433 | r = manager_llmnr_ipv6_udp_fd(m); | |
434 | if (r == -EADDRINUSE) | |
435 | goto eaddrinuse; | |
436 | if (r < 0) | |
437 | return r; | |
438 | ||
439 | r = manager_llmnr_ipv6_tcp_fd(m); | |
440 | if (r == -EADDRINUSE) | |
441 | goto eaddrinuse; | |
442 | if (r < 0) | |
443 | return r; | |
444 | } | |
edc501d4 LP |
445 | |
446 | return 0; | |
447 | ||
448 | eaddrinuse: | |
c4147df1 | 449 | log_warning("There appears to be another LLMNR responder running. Turning off LLMNR support."); |
edc501d4 LP |
450 | m->llmnr_support = SUPPORT_NO; |
451 | manager_llmnr_stop(m); | |
90ab5042 | 452 | |
edc501d4 LP |
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 | 536 | |
3e684349 LP |
537 | manager_flush_dns_servers(m, DNS_SERVER_SYSTEM); |
538 | manager_flush_dns_servers(m, DNS_SERVER_FALLBACK); | |
091a364c | 539 | |
cab5b059 LP |
540 | dns_scope_free(m->unicast_scope); |
541 | ||
f0e15467 LP |
542 | hashmap_free(m->links); |
543 | hashmap_free(m->dns_transactions); | |
544 | ||
096b6773 LP |
545 | sd_event_source_unref(m->network_event_source); |
546 | sd_network_monitor_unref(m->network_monitor); | |
091a364c | 547 | |
74b2466e LP |
548 | sd_event_source_unref(m->dns_ipv4_event_source); |
549 | sd_event_source_unref(m->dns_ipv6_event_source); | |
74b2466e LP |
550 | safe_close(m->dns_ipv4_fd); |
551 | safe_close(m->dns_ipv6_fd); | |
552 | ||
edc501d4 | 553 | manager_llmnr_stop(m); |
623a4c97 | 554 | |
902bb5d8 | 555 | sd_bus_slot_unref(m->prepare_for_sleep_slot); |
74b2466e LP |
556 | sd_event_source_unref(m->bus_retry_event_source); |
557 | sd_bus_unref(m->bus); | |
091a364c | 558 | |
74b2466e | 559 | sd_event_unref(m->event); |
623a4c97 LP |
560 | |
561 | dns_resource_key_unref(m->host_ipv4_key); | |
562 | dns_resource_key_unref(m->host_ipv6_key); | |
eb60f9cd LP |
563 | |
564 | safe_close(m->hostname_fd); | |
565 | sd_event_source_unref(m->hostname_event_source); | |
623a4c97 | 566 | free(m->hostname); |
eb60f9cd | 567 | |
091a364c | 568 | free(m); |
74b2466e LP |
569 | |
570 | return NULL; | |
091a364c TG |
571 | } |
572 | ||
5cb36f41 LP |
573 | int manager_read_resolv_conf(Manager *m) { |
574 | _cleanup_fclose_ FILE *f = NULL; | |
575 | struct stat st, own; | |
576 | char line[LINE_MAX]; | |
577 | DnsServer *s, *nx; | |
578 | usec_t t; | |
579 | int r; | |
580 | ||
581 | assert(m); | |
582 | ||
583 | /* Reads the system /etc/resolv.conf, if it exists and is not | |
584 | * symlinked to our own resolv.conf instance */ | |
585 | ||
586 | if (!m->read_resolv_conf) | |
587 | return 0; | |
588 | ||
589 | r = stat("/etc/resolv.conf", &st); | |
590 | if (r < 0) { | |
591 | if (errno != ENOENT) | |
56f64d95 | 592 | log_warning_errno(errno, "Failed to open /etc/resolv.conf: %m"); |
5cb36f41 LP |
593 | r = -errno; |
594 | goto clear; | |
595 | } | |
596 | ||
597 | /* Have we already seen the file? */ | |
598 | t = timespec_load(&st.st_mtim); | |
599 | if (t == m->resolv_conf_mtime) | |
600 | return 0; | |
601 | ||
602 | m->resolv_conf_mtime = t; | |
603 | ||
604 | /* Is it symlinked to our own file? */ | |
605 | if (stat("/run/systemd/resolve/resolv.conf", &own) >= 0 && | |
606 | st.st_dev == own.st_dev && | |
607 | st.st_ino == own.st_ino) { | |
608 | r = 0; | |
609 | goto clear; | |
610 | } | |
611 | ||
612 | f = fopen("/etc/resolv.conf", "re"); | |
613 | if (!f) { | |
614 | if (errno != ENOENT) | |
56f64d95 | 615 | log_warning_errno(errno, "Failed to open /etc/resolv.conf: %m"); |
5cb36f41 LP |
616 | r = -errno; |
617 | goto clear; | |
618 | } | |
619 | ||
620 | if (fstat(fileno(f), &st) < 0) { | |
56f64d95 | 621 | log_error_errno(errno, "Failed to stat open file: %m"); |
5cb36f41 LP |
622 | r = -errno; |
623 | goto clear; | |
624 | } | |
625 | ||
626 | LIST_FOREACH(servers, s, m->dns_servers) | |
627 | s->marked = true; | |
628 | ||
629 | FOREACH_LINE(line, f, r = -errno; goto clear) { | |
630 | union in_addr_union address; | |
631 | int family; | |
632 | char *l; | |
633 | const char *a; | |
634 | ||
635 | truncate_nl(line); | |
636 | ||
637 | l = strstrip(line); | |
638 | if (*l == '#' || *l == ';') | |
639 | continue; | |
640 | ||
641 | a = first_word(l, "nameserver"); | |
642 | if (!a) | |
643 | continue; | |
644 | ||
645 | r = in_addr_from_string_auto(a, &family, &address); | |
646 | if (r < 0) { | |
647 | log_warning("Failed to parse name server %s.", a); | |
648 | continue; | |
649 | } | |
650 | ||
651 | LIST_FOREACH(servers, s, m->dns_servers) | |
652 | if (s->family == family && in_addr_equal(family, &s->address, &address) > 0) | |
653 | break; | |
654 | ||
655 | if (s) | |
656 | s->marked = false; | |
657 | else { | |
658 | r = dns_server_new(m, NULL, DNS_SERVER_SYSTEM, NULL, family, &address); | |
659 | if (r < 0) | |
660 | goto clear; | |
661 | } | |
662 | } | |
663 | ||
664 | LIST_FOREACH_SAFE(servers, s, nx, m->dns_servers) | |
665 | if (s->marked) | |
666 | dns_server_free(s); | |
667 | ||
36a03ca2 LP |
668 | /* Whenever /etc/resolv.conf changes, start using the first |
669 | * DNS server of it. This is useful to deal with broken | |
670 | * network managing implementations (like NetworkManager), | |
671 | * that when connecting to a VPN place both the VPN DNS | |
672 | * servers and the local ones in /etc/resolv.conf. Without | |
673 | * resetting the DNS server to use back to the first entry we | |
674 | * will continue to use the local one thus being unable to | |
675 | * resolve VPN domains. */ | |
676 | manager_set_dns_server(m, m->dns_servers); | |
677 | ||
5cb36f41 LP |
678 | return 0; |
679 | ||
680 | clear: | |
681 | while (m->dns_servers) | |
682 | dns_server_free(m->dns_servers); | |
683 | ||
684 | return r; | |
685 | } | |
686 | ||
bda2c408 | 687 | static void write_resolv_conf_server(DnsServer *s, FILE *f, unsigned *count) { |
74b2466e LP |
688 | _cleanup_free_ char *t = NULL; |
689 | int r; | |
091a364c | 690 | |
74b2466e | 691 | assert(s); |
091a364c | 692 | assert(f); |
091a364c TG |
693 | assert(count); |
694 | ||
74b2466e | 695 | r = in_addr_to_string(s->family, &s->address, &t); |
4e945a6f | 696 | if (r < 0) { |
da927ba9 | 697 | log_warning_errno(r, "Invalid DNS address. Ignoring: %m"); |
091a364c TG |
698 | return; |
699 | } | |
700 | ||
701 | if (*count == MAXNS) | |
87f5a193 | 702 | fputs("# Too many DNS servers configured, the following entries may be ignored.\n", f); |
091a364c | 703 | |
74b2466e | 704 | fprintf(f, "nameserver %s\n", t); |
091a364c TG |
705 | (*count) ++; |
706 | } | |
707 | ||
822db23c LP |
708 | static void write_resolv_conf_search( |
709 | const char *domain, FILE *f, | |
710 | unsigned *count, | |
711 | unsigned *length) { | |
712 | ||
bda2c408 TG |
713 | assert(domain); |
714 | assert(f); | |
715 | assert(length); | |
716 | ||
717 | if (*count >= MAXDNSRCH || | |
718 | *length + strlen(domain) > 256) { | |
719 | if (*count == MAXDNSRCH) | |
720 | fputs(" # Too many search domains configured, remaining ones ignored.", f); | |
721 | if (*length <= 256) | |
722 | fputs(" # Total length of all search domains is too long, remaining ones ignored.", f); | |
723 | ||
724 | return; | |
725 | } | |
726 | ||
727 | fprintf(f, " %s", domain); | |
728 | ||
729 | (*length) += strlen(domain); | |
730 | (*count) ++; | |
731 | } | |
732 | ||
822db23c | 733 | static int write_resolv_conf_contents(FILE *f, OrderedSet *dns, OrderedSet *domains) { |
4713135e ZJS |
734 | Iterator i; |
735 | ||
736 | fputs("# This file is managed by systemd-resolved(8). Do not edit.\n#\n" | |
737 | "# Third party programs must not access this file directly, but\n" | |
738 | "# only through the symlink at /etc/resolv.conf. To manage\n" | |
739 | "# resolv.conf(5) in a different way, replace the symlink by a\n" | |
740 | "# static file or a different symlink.\n\n", f); | |
741 | ||
822db23c | 742 | if (ordered_set_isempty(dns)) |
4713135e ZJS |
743 | fputs("# No DNS servers known.\n", f); |
744 | else { | |
745 | DnsServer *s; | |
746 | unsigned count = 0; | |
747 | ||
822db23c | 748 | ORDERED_SET_FOREACH(s, dns, i) |
4713135e ZJS |
749 | write_resolv_conf_server(s, f, &count); |
750 | } | |
751 | ||
822db23c | 752 | if (!ordered_set_isempty(domains)) { |
4713135e ZJS |
753 | unsigned length = 0, count = 0; |
754 | char *domain; | |
755 | ||
756 | fputs("search", f); | |
822db23c | 757 | ORDERED_SET_FOREACH(domain, domains, i) |
4713135e ZJS |
758 | write_resolv_conf_search(domain, f, &count, &length); |
759 | fputs("\n", f); | |
760 | } | |
761 | ||
762 | return fflush_and_check(f); | |
763 | } | |
764 | ||
74b2466e | 765 | int manager_write_resolv_conf(Manager *m) { |
4e945a6f | 766 | static const char path[] = "/run/systemd/resolve/resolv.conf"; |
091a364c TG |
767 | _cleanup_free_ char *temp_path = NULL; |
768 | _cleanup_fclose_ FILE *f = NULL; | |
822db23c | 769 | _cleanup_ordered_set_free_ OrderedSet *dns = NULL, *domains = NULL; |
74b2466e LP |
770 | DnsServer *s; |
771 | Iterator i; | |
772 | Link *l; | |
773 | int r; | |
091a364c TG |
774 | |
775 | assert(m); | |
776 | ||
5cb36f41 LP |
777 | /* Read the system /etc/resolv.conf first */ |
778 | manager_read_resolv_conf(m); | |
779 | ||
87f5a193 | 780 | /* Add the full list to a set, to filter out duplicates */ |
822db23c | 781 | dns = ordered_set_new(&dns_server_hash_ops); |
87f5a193 LP |
782 | if (!dns) |
783 | return -ENOMEM; | |
784 | ||
822db23c | 785 | domains = ordered_set_new(&dns_name_hash_ops); |
bda2c408 TG |
786 | if (!domains) |
787 | return -ENOMEM; | |
788 | ||
87f5a193 LP |
789 | /* First add the system-wide servers */ |
790 | LIST_FOREACH(servers, s, m->dns_servers) { | |
822db23c | 791 | r = ordered_set_put(dns, s); |
87f5a193 LP |
792 | if (r == -EEXIST) |
793 | continue; | |
794 | if (r < 0) | |
795 | return r; | |
796 | } | |
797 | ||
bda2c408 TG |
798 | /* Then, add the per-link servers and domains */ |
799 | HASHMAP_FOREACH(l, m->links, i) { | |
800 | char **domain; | |
801 | ||
87f5a193 | 802 | LIST_FOREACH(servers, s, l->dns_servers) { |
822db23c | 803 | r = ordered_set_put(dns, s); |
87f5a193 LP |
804 | if (r == -EEXIST) |
805 | continue; | |
806 | if (r < 0) | |
807 | return r; | |
808 | } | |
809 | ||
bda2c408 TG |
810 | if (!l->unicast_scope) |
811 | continue; | |
812 | ||
813 | STRV_FOREACH(domain, l->unicast_scope->domains) { | |
822db23c | 814 | r = ordered_set_put(domains, *domain); |
bda2c408 TG |
815 | if (r == -EEXIST) |
816 | continue; | |
817 | if (r < 0) | |
818 | return r; | |
819 | } | |
820 | } | |
821 | ||
87f5a193 | 822 | /* If we found nothing, add the fallback servers */ |
822db23c | 823 | if (ordered_set_isempty(dns)) { |
87f5a193 | 824 | LIST_FOREACH(servers, s, m->fallback_dns_servers) { |
822db23c | 825 | r = ordered_set_put(dns, s); |
87f5a193 LP |
826 | if (r == -EEXIST) |
827 | continue; | |
828 | if (r < 0) | |
829 | return r; | |
830 | } | |
831 | } | |
832 | ||
a5a807e6 | 833 | r = fopen_temporary_label(path, path, &f, &temp_path); |
091a364c TG |
834 | if (r < 0) |
835 | return r; | |
836 | ||
837 | fchmod(fileno(f), 0644); | |
838 | ||
4713135e | 839 | r = write_resolv_conf_contents(f, dns, domains); |
74b2466e LP |
840 | if (r < 0) |
841 | goto fail; | |
842 | ||
843 | if (rename(temp_path, path) < 0) { | |
844 | r = -errno; | |
845 | goto fail; | |
846 | } | |
091a364c | 847 | |
74b2466e | 848 | return 0; |
091a364c | 849 | |
74b2466e | 850 | fail: |
822db23c LP |
851 | (void) unlink(path); |
852 | (void) unlink(temp_path); | |
74b2466e LP |
853 | return r; |
854 | } | |
091a364c | 855 | |
1716f6dc | 856 | int manager_recv(Manager *m, int fd, DnsProtocol protocol, DnsPacket **ret) { |
74b2466e | 857 | _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL; |
1716f6dc LP |
858 | union { |
859 | struct cmsghdr header; /* For alignment */ | |
40a1eebd | 860 | uint8_t buffer[CMSG_SPACE(MAXSIZE(struct in_pktinfo, struct in6_pktinfo)) |
1716f6dc | 861 | + CMSG_SPACE(int) /* ttl/hoplimit */ |
623a4c97 | 862 | + EXTRA_CMSG_SPACE /* kernel appears to require extra buffer space */]; |
1716f6dc LP |
863 | } control; |
864 | union sockaddr_union sa; | |
74b2466e | 865 | struct msghdr mh = {}; |
1716f6dc | 866 | struct cmsghdr *cmsg; |
74b2466e | 867 | struct iovec iov; |
1716f6dc | 868 | int ms = 0, r; |
74b2466e LP |
869 | ssize_t l; |
870 | ||
871 | assert(m); | |
1716f6dc | 872 | assert(fd >= 0); |
74b2466e LP |
873 | assert(ret); |
874 | ||
74b2466e LP |
875 | r = ioctl(fd, FIONREAD, &ms); |
876 | if (r < 0) | |
877 | return -errno; | |
878 | if (ms < 0) | |
879 | return -EIO; | |
880 | ||
1716f6dc | 881 | r = dns_packet_new(&p, protocol, ms); |
74b2466e LP |
882 | if (r < 0) |
883 | return r; | |
884 | ||
885 | iov.iov_base = DNS_PACKET_DATA(p); | |
886 | iov.iov_len = p->allocated; | |
887 | ||
1716f6dc LP |
888 | mh.msg_name = &sa.sa; |
889 | mh.msg_namelen = sizeof(sa); | |
74b2466e LP |
890 | mh.msg_iov = &iov; |
891 | mh.msg_iovlen = 1; | |
1716f6dc LP |
892 | mh.msg_control = &control; |
893 | mh.msg_controllen = sizeof(control); | |
74b2466e | 894 | |
a38d9945 | 895 | l = recvmsg(fd, &mh, 0); |
74b2466e | 896 | if (l < 0) { |
ad867662 | 897 | if (errno == EAGAIN || errno == EINTR) |
74b2466e LP |
898 | return 0; |
899 | ||
900 | return -errno; | |
091a364c TG |
901 | } |
902 | ||
74b2466e LP |
903 | if (l <= 0) |
904 | return -EIO; | |
091a364c | 905 | |
1716f6dc LP |
906 | assert(!(mh.msg_flags & MSG_CTRUNC)); |
907 | assert(!(mh.msg_flags & MSG_TRUNC)); | |
908 | ||
74b2466e | 909 | p->size = (size_t) l; |
091a364c | 910 | |
1716f6dc | 911 | p->family = sa.sa.sa_family; |
623a4c97 LP |
912 | p->ipproto = IPPROTO_UDP; |
913 | if (p->family == AF_INET) { | |
1716f6dc | 914 | p->sender.in = sa.in.sin_addr; |
623a4c97 LP |
915 | p->sender_port = be16toh(sa.in.sin_port); |
916 | } else if (p->family == AF_INET6) { | |
1716f6dc | 917 | p->sender.in6 = sa.in6.sin6_addr; |
623a4c97 LP |
918 | p->sender_port = be16toh(sa.in6.sin6_port); |
919 | p->ifindex = sa.in6.sin6_scope_id; | |
920 | } else | |
1716f6dc | 921 | return -EAFNOSUPPORT; |
74b2466e | 922 | |
1716f6dc | 923 | for (cmsg = CMSG_FIRSTHDR(&mh); cmsg; cmsg = CMSG_NXTHDR(&mh, cmsg)) { |
74b2466e | 924 | |
1716f6dc LP |
925 | if (cmsg->cmsg_level == IPPROTO_IPV6) { |
926 | assert(p->family == AF_INET6); | |
74b2466e | 927 | |
1716f6dc | 928 | switch (cmsg->cmsg_type) { |
74b2466e | 929 | |
1716f6dc LP |
930 | case IPV6_PKTINFO: { |
931 | struct in6_pktinfo *i = (struct in6_pktinfo*) CMSG_DATA(cmsg); | |
74b2466e | 932 | |
623a4c97 LP |
933 | if (p->ifindex <= 0) |
934 | p->ifindex = i->ipi6_ifindex; | |
935 | ||
1716f6dc LP |
936 | p->destination.in6 = i->ipi6_addr; |
937 | break; | |
938 | } | |
74b2466e | 939 | |
1716f6dc LP |
940 | case IPV6_HOPLIMIT: |
941 | p->ttl = *(int *) CMSG_DATA(cmsg); | |
942 | break; | |
74b2466e | 943 | |
1716f6dc LP |
944 | } |
945 | } else if (cmsg->cmsg_level == IPPROTO_IP) { | |
946 | assert(p->family == AF_INET); | |
74b2466e | 947 | |
1716f6dc | 948 | switch (cmsg->cmsg_type) { |
74b2466e | 949 | |
1716f6dc LP |
950 | case IP_PKTINFO: { |
951 | struct in_pktinfo *i = (struct in_pktinfo*) CMSG_DATA(cmsg); | |
091a364c | 952 | |
623a4c97 LP |
953 | if (p->ifindex <= 0) |
954 | p->ifindex = i->ipi_ifindex; | |
955 | ||
1716f6dc LP |
956 | p->destination.in = i->ipi_addr; |
957 | break; | |
958 | } | |
74b2466e | 959 | |
623a4c97 | 960 | case IP_TTL: |
1716f6dc LP |
961 | p->ttl = *(int *) CMSG_DATA(cmsg); |
962 | break; | |
963 | } | |
964 | } | |
965 | } | |
74b2466e | 966 | |
623a4c97 LP |
967 | /* The Linux kernel sets the interface index to the loopback |
968 | * device if the packet came from the local host since it | |
969 | * avoids the routing table in such a case. Let's unset the | |
970 | * interface index in such a case. */ | |
a5f03596 | 971 | if (p->ifindex == LOOPBACK_IFINDEX) |
623a4c97 LP |
972 | p->ifindex = 0; |
973 | ||
974 | /* If we don't know the interface index still, we look for the | |
975 | * first local interface with a matching address. Yuck! */ | |
976 | if (p->ifindex <= 0) | |
977 | p->ifindex = manager_find_ifindex(m, p->family, &p->destination); | |
978 | ||
74b2466e LP |
979 | *ret = p; |
980 | p = NULL; | |
981 | ||
982 | return 1; | |
983 | } | |
984 | ||
1716f6dc | 985 | static int on_dns_packet(sd_event_source *s, int fd, uint32_t revents, void *userdata) { |
74b2466e | 986 | _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL; |
ec2c5e43 | 987 | DnsTransaction *t = NULL; |
74b2466e LP |
988 | Manager *m = userdata; |
989 | int r; | |
990 | ||
1716f6dc | 991 | r = manager_recv(m, fd, DNS_PROTOCOL_DNS, &p); |
74b2466e LP |
992 | if (r <= 0) |
993 | return r; | |
994 | ||
623a4c97 | 995 | if (dns_packet_validate_reply(p) > 0) { |
ec2c5e43 | 996 | t = hashmap_get(m->dns_transactions, UINT_TO_PTR(DNS_PACKET_ID(p))); |
1716f6dc LP |
997 | if (!t) |
998 | return 0; | |
74b2466e | 999 | |
ec2c5e43 | 1000 | dns_transaction_process_reply(t, p); |
623a4c97 | 1001 | |
1716f6dc | 1002 | } else |
623a4c97 | 1003 | log_debug("Invalid DNS packet."); |
74b2466e | 1004 | |
ad867662 | 1005 | return 0; |
74b2466e LP |
1006 | } |
1007 | ||
1008 | int manager_dns_ipv4_fd(Manager *m) { | |
1716f6dc | 1009 | const int one = 1; |
74b2466e LP |
1010 | int r; |
1011 | ||
091a364c TG |
1012 | assert(m); |
1013 | ||
74b2466e LP |
1014 | if (m->dns_ipv4_fd >= 0) |
1015 | return m->dns_ipv4_fd; | |
091a364c | 1016 | |
74b2466e LP |
1017 | m->dns_ipv4_fd = socket(AF_INET, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); |
1018 | if (m->dns_ipv4_fd < 0) | |
1019 | return -errno; | |
091a364c | 1020 | |
1716f6dc LP |
1021 | r = setsockopt(m->dns_ipv4_fd, IPPROTO_IP, IP_PKTINFO, &one, sizeof(one)); |
1022 | if (r < 0) { | |
1023 | r = -errno; | |
1024 | goto fail; | |
1025 | } | |
1026 | ||
1027 | r = sd_event_add_io(m->event, &m->dns_ipv4_event_source, m->dns_ipv4_fd, EPOLLIN, on_dns_packet, m); | |
74b2466e | 1028 | if (r < 0) |
1716f6dc | 1029 | goto fail; |
74b2466e LP |
1030 | |
1031 | return m->dns_ipv4_fd; | |
1716f6dc LP |
1032 | |
1033 | fail: | |
1034 | m->dns_ipv4_fd = safe_close(m->dns_ipv4_fd); | |
1035 | return r; | |
091a364c TG |
1036 | } |
1037 | ||
74b2466e | 1038 | int manager_dns_ipv6_fd(Manager *m) { |
1716f6dc | 1039 | const int one = 1; |
74b2466e LP |
1040 | int r; |
1041 | ||
1042 | assert(m); | |
091a364c | 1043 | |
74b2466e LP |
1044 | if (m->dns_ipv6_fd >= 0) |
1045 | return m->dns_ipv6_fd; | |
1046 | ||
1047 | m->dns_ipv6_fd = socket(AF_INET6, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); | |
1048 | if (m->dns_ipv6_fd < 0) | |
1049 | return -errno; | |
1050 | ||
1716f6dc LP |
1051 | r = setsockopt(m->dns_ipv6_fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, &one, sizeof(one)); |
1052 | if (r < 0) { | |
1053 | r = -errno; | |
1054 | goto fail; | |
1055 | } | |
1056 | ||
1057 | r = sd_event_add_io(m->event, &m->dns_ipv6_event_source, m->dns_ipv6_fd, EPOLLIN, on_dns_packet, m); | |
091a364c | 1058 | if (r < 0) |
1716f6dc | 1059 | goto fail; |
091a364c | 1060 | |
74b2466e | 1061 | return m->dns_ipv6_fd; |
1716f6dc LP |
1062 | |
1063 | fail: | |
1064 | m->dns_ipv6_fd = safe_close(m->dns_ipv6_fd); | |
1065 | return r; | |
74b2466e LP |
1066 | } |
1067 | ||
1068 | static int sendmsg_loop(int fd, struct msghdr *mh, int flags) { | |
1069 | int r; | |
1070 | ||
1071 | assert(fd >= 0); | |
1072 | assert(mh); | |
1073 | ||
1074 | for (;;) { | |
1075 | if (sendmsg(fd, mh, flags) >= 0) | |
1076 | return 0; | |
1077 | ||
1078 | if (errno == EINTR) | |
1079 | continue; | |
1080 | ||
1081 | if (errno != EAGAIN) | |
1082 | return -errno; | |
1083 | ||
1084 | r = fd_wait_for_event(fd, POLLOUT, SEND_TIMEOUT_USEC); | |
1085 | if (r < 0) | |
1086 | return r; | |
1087 | if (r == 0) | |
1088 | return -ETIMEDOUT; | |
1089 | } | |
1090 | } | |
1091 | ||
623a4c97 | 1092 | static int manager_ipv4_send(Manager *m, int fd, int ifindex, const struct in_addr *addr, uint16_t port, DnsPacket *p) { |
74b2466e LP |
1093 | union sockaddr_union sa = { |
1094 | .in.sin_family = AF_INET, | |
74b2466e | 1095 | }; |
1716f6dc LP |
1096 | union { |
1097 | struct cmsghdr header; /* For alignment */ | |
1098 | uint8_t buffer[CMSG_SPACE(sizeof(struct in_pktinfo))]; | |
1099 | } control; | |
74b2466e LP |
1100 | struct msghdr mh = {}; |
1101 | struct iovec iov; | |
74b2466e LP |
1102 | |
1103 | assert(m); | |
1716f6dc LP |
1104 | assert(fd >= 0); |
1105 | assert(addr); | |
1106 | assert(port > 0); | |
74b2466e LP |
1107 | assert(p); |
1108 | ||
74b2466e LP |
1109 | iov.iov_base = DNS_PACKET_DATA(p); |
1110 | iov.iov_len = p->size; | |
091a364c | 1111 | |
1716f6dc LP |
1112 | sa.in.sin_addr = *addr; |
1113 | sa.in.sin_port = htobe16(port), | |
091a364c | 1114 | |
74b2466e LP |
1115 | mh.msg_iov = &iov; |
1116 | mh.msg_iovlen = 1; | |
1117 | mh.msg_name = &sa.sa; | |
1118 | mh.msg_namelen = sizeof(sa.in); | |
091a364c | 1119 | |
74b2466e LP |
1120 | if (ifindex > 0) { |
1121 | struct cmsghdr *cmsg; | |
1122 | struct in_pktinfo *pi; | |
1123 | ||
1124 | zero(control); | |
1125 | ||
1716f6dc | 1126 | mh.msg_control = &control; |
74b2466e LP |
1127 | mh.msg_controllen = CMSG_LEN(sizeof(struct in_pktinfo)); |
1128 | ||
1129 | cmsg = CMSG_FIRSTHDR(&mh); | |
1130 | cmsg->cmsg_len = mh.msg_controllen; | |
1131 | cmsg->cmsg_level = IPPROTO_IP; | |
1132 | cmsg->cmsg_type = IP_PKTINFO; | |
1133 | ||
1134 | pi = (struct in_pktinfo*) CMSG_DATA(cmsg); | |
1135 | pi->ipi_ifindex = ifindex; | |
1136 | } | |
1137 | ||
1138 | return sendmsg_loop(fd, &mh, 0); | |
1139 | } | |
1140 | ||
623a4c97 | 1141 | static int manager_ipv6_send(Manager *m, int fd, int ifindex, const struct in6_addr *addr, uint16_t port, DnsPacket *p) { |
74b2466e LP |
1142 | union sockaddr_union sa = { |
1143 | .in6.sin6_family = AF_INET6, | |
74b2466e | 1144 | }; |
1716f6dc LP |
1145 | union { |
1146 | struct cmsghdr header; /* For alignment */ | |
1147 | uint8_t buffer[CMSG_SPACE(sizeof(struct in6_pktinfo))]; | |
1148 | } control; | |
74b2466e LP |
1149 | struct msghdr mh = {}; |
1150 | struct iovec iov; | |
74b2466e LP |
1151 | |
1152 | assert(m); | |
1716f6dc LP |
1153 | assert(fd >= 0); |
1154 | assert(addr); | |
1155 | assert(port > 0); | |
74b2466e LP |
1156 | assert(p); |
1157 | ||
74b2466e LP |
1158 | iov.iov_base = DNS_PACKET_DATA(p); |
1159 | iov.iov_len = p->size; | |
1160 | ||
1716f6dc LP |
1161 | sa.in6.sin6_addr = *addr; |
1162 | sa.in6.sin6_port = htobe16(port), | |
74b2466e LP |
1163 | sa.in6.sin6_scope_id = ifindex; |
1164 | ||
1165 | mh.msg_iov = &iov; | |
1166 | mh.msg_iovlen = 1; | |
1167 | mh.msg_name = &sa.sa; | |
1168 | mh.msg_namelen = sizeof(sa.in6); | |
1169 | ||
1170 | if (ifindex > 0) { | |
1171 | struct cmsghdr *cmsg; | |
1172 | struct in6_pktinfo *pi; | |
1173 | ||
1174 | zero(control); | |
1175 | ||
1716f6dc | 1176 | mh.msg_control = &control; |
74b2466e LP |
1177 | mh.msg_controllen = CMSG_LEN(sizeof(struct in6_pktinfo)); |
1178 | ||
1179 | cmsg = CMSG_FIRSTHDR(&mh); | |
1180 | cmsg->cmsg_len = mh.msg_controllen; | |
1181 | cmsg->cmsg_level = IPPROTO_IPV6; | |
1182 | cmsg->cmsg_type = IPV6_PKTINFO; | |
1183 | ||
1184 | pi = (struct in6_pktinfo*) CMSG_DATA(cmsg); | |
1185 | pi->ipi6_ifindex = ifindex; | |
1186 | } | |
1187 | ||
1188 | return sendmsg_loop(fd, &mh, 0); | |
1189 | } | |
1190 | ||
623a4c97 | 1191 | int manager_send(Manager *m, int fd, int ifindex, int family, const union in_addr_union *addr, uint16_t port, DnsPacket *p) { |
1716f6dc LP |
1192 | assert(m); |
1193 | assert(fd >= 0); | |
1194 | assert(addr); | |
1195 | assert(port > 0); | |
1196 | assert(p); | |
1197 | ||
a2a416f7 LP |
1198 | 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)); |
1199 | ||
1716f6dc LP |
1200 | if (family == AF_INET) |
1201 | return manager_ipv4_send(m, fd, ifindex, &addr->in, port, p); | |
1202 | else if (family == AF_INET6) | |
1203 | return manager_ipv6_send(m, fd, ifindex, &addr->in6, port, p); | |
1204 | ||
1205 | return -EAFNOSUPPORT; | |
1206 | } | |
1207 | ||
2c27fbca | 1208 | DnsServer* manager_find_dns_server(Manager *m, int family, const union in_addr_union *in_addr) { |
74b2466e LP |
1209 | DnsServer *s; |
1210 | ||
1211 | assert(m); | |
1212 | assert(in_addr); | |
1213 | ||
4e945a6f | 1214 | LIST_FOREACH(servers, s, m->dns_servers) |
5cb36f41 | 1215 | if (s->family == family && in_addr_equal(family, &s->address, in_addr) > 0) |
2c27fbca | 1216 | return s; |
74b2466e | 1217 | |
4e945a6f | 1218 | LIST_FOREACH(servers, s, m->fallback_dns_servers) |
5cb36f41 | 1219 | if (s->family == family && in_addr_equal(family, &s->address, in_addr) > 0) |
2c27fbca | 1220 | return s; |
74b2466e | 1221 | |
2c27fbca | 1222 | return NULL; |
4e945a6f LP |
1223 | } |
1224 | ||
2c27fbca | 1225 | DnsServer *manager_set_dns_server(Manager *m, DnsServer *s) { |
4e945a6f LP |
1226 | assert(m); |
1227 | ||
1228 | if (m->current_dns_server == s) | |
1229 | return s; | |
1230 | ||
1231 | if (s) { | |
1232 | _cleanup_free_ char *ip = NULL; | |
1233 | ||
1234 | in_addr_to_string(s->family, &s->address, &ip); | |
1235 | log_info("Switching to system DNS server %s.", strna(ip)); | |
2c27fbca | 1236 | } |
4e945a6f LP |
1237 | |
1238 | m->current_dns_server = s; | |
2c27fbca LP |
1239 | |
1240 | if (m->unicast_scope) | |
1241 | dns_cache_flush(&m->unicast_scope->cache); | |
1242 | ||
4e945a6f | 1243 | return s; |
74b2466e LP |
1244 | } |
1245 | ||
1246 | DnsServer *manager_get_dns_server(Manager *m) { | |
4e945a6f | 1247 | Link *l; |
74b2466e LP |
1248 | assert(m); |
1249 | ||
5cb36f41 LP |
1250 | /* Try to read updates resolv.conf */ |
1251 | manager_read_resolv_conf(m); | |
1252 | ||
74b2466e | 1253 | if (!m->current_dns_server) |
4e945a6f LP |
1254 | manager_set_dns_server(m, m->dns_servers); |
1255 | ||
1256 | if (!m->current_dns_server) { | |
1257 | bool found = false; | |
1258 | Iterator i; | |
1259 | ||
1260 | /* No DNS servers configured, let's see if there are | |
1261 | * any on any links. If not, we use the fallback | |
1262 | * servers */ | |
1263 | ||
1264 | HASHMAP_FOREACH(l, m->links, i) | |
1265 | if (l->dns_servers) { | |
1266 | found = true; | |
1267 | break; | |
1268 | } | |
1269 | ||
1270 | if (!found) | |
1271 | manager_set_dns_server(m, m->fallback_dns_servers); | |
1272 | } | |
74b2466e LP |
1273 | |
1274 | return m->current_dns_server; | |
1275 | } | |
1276 | ||
1277 | void manager_next_dns_server(Manager *m) { | |
1278 | assert(m); | |
1279 | ||
4e945a6f LP |
1280 | /* If there's currently no DNS server set, then the next |
1281 | * manager_get_dns_server() will find one */ | |
74b2466e LP |
1282 | if (!m->current_dns_server) |
1283 | return; | |
1284 | ||
4e945a6f | 1285 | /* Change to the next one */ |
74b2466e | 1286 | if (m->current_dns_server->servers_next) { |
4e945a6f | 1287 | manager_set_dns_server(m, m->current_dns_server->servers_next); |
74b2466e LP |
1288 | return; |
1289 | } | |
1290 | ||
4e945a6f LP |
1291 | /* If there was no next one, then start from the beginning of |
1292 | * the list */ | |
1293 | if (m->current_dns_server->type == DNS_SERVER_FALLBACK) | |
1294 | manager_set_dns_server(m, m->fallback_dns_servers); | |
1295 | else | |
1296 | manager_set_dns_server(m, m->dns_servers); | |
091a364c | 1297 | } |
e1c95994 LP |
1298 | |
1299 | uint32_t manager_find_mtu(Manager *m) { | |
1300 | uint32_t mtu = 0; | |
1301 | Link *l; | |
1302 | Iterator i; | |
1303 | ||
1304 | /* If we don't know on which link a DNS packet would be | |
1305 | * delivered, let's find the largest MTU that works on all | |
1306 | * interfaces we know of */ | |
1307 | ||
1308 | HASHMAP_FOREACH(l, m->links, i) { | |
1309 | if (l->mtu <= 0) | |
1310 | continue; | |
1311 | ||
1312 | if (mtu <= 0 || l->mtu < mtu) | |
1313 | mtu = l->mtu; | |
1314 | } | |
1315 | ||
1316 | return mtu; | |
1317 | } | |
1716f6dc LP |
1318 | |
1319 | static int on_llmnr_packet(sd_event_source *s, int fd, uint32_t revents, void *userdata) { | |
1320 | _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL; | |
ec2c5e43 | 1321 | DnsTransaction *t = NULL; |
1716f6dc | 1322 | Manager *m = userdata; |
a4076574 | 1323 | DnsScope *scope; |
1716f6dc LP |
1324 | int r; |
1325 | ||
1326 | r = manager_recv(m, fd, DNS_PROTOCOL_LLMNR, &p); | |
1327 | if (r <= 0) | |
1328 | return r; | |
1329 | ||
a4076574 LP |
1330 | scope = manager_find_scope(m, p); |
1331 | if (!scope) { | |
1332 | log_warning("Got LLMNR UDP packet on unknown scope. Ignoring."); | |
1333 | return 0; | |
1334 | } | |
1335 | ||
623a4c97 | 1336 | if (dns_packet_validate_reply(p) > 0) { |
a2a416f7 LP |
1337 | log_debug("Got reply packet for id %u", DNS_PACKET_ID(p)); |
1338 | ||
a4076574 | 1339 | dns_scope_check_conflicts(scope, p); |
623a4c97 | 1340 | |
a4076574 LP |
1341 | t = hashmap_get(m->dns_transactions, UINT_TO_PTR(DNS_PACKET_ID(p))); |
1342 | if (t) | |
1343 | dns_transaction_process_reply(t, p); | |
623a4c97 | 1344 | |
a4076574 LP |
1345 | } else if (dns_packet_validate_query(p) > 0) { |
1346 | log_debug("Got query packet for id %u", DNS_PACKET_ID(p)); | |
623a4c97 | 1347 | |
a4076574 | 1348 | dns_scope_process_query(scope, NULL, p); |
623a4c97 | 1349 | } else |
a4076574 | 1350 | log_debug("Invalid LLMNR UDP packet."); |
1716f6dc LP |
1351 | |
1352 | return 0; | |
1353 | } | |
1354 | ||
1355 | int manager_llmnr_ipv4_udp_fd(Manager *m) { | |
1356 | union sockaddr_union sa = { | |
1357 | .in.sin_family = AF_INET, | |
1358 | .in.sin_port = htobe16(5355), | |
1359 | }; | |
bf3f1271 | 1360 | static const int one = 1, pmtu = IP_PMTUDISC_DONT, ttl = 255; |
1716f6dc LP |
1361 | int r; |
1362 | ||
1363 | assert(m); | |
1364 | ||
1365 | if (m->llmnr_ipv4_udp_fd >= 0) | |
1366 | return m->llmnr_ipv4_udp_fd; | |
1367 | ||
1368 | m->llmnr_ipv4_udp_fd = socket(AF_INET, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); | |
1369 | if (m->llmnr_ipv4_udp_fd < 0) | |
1370 | return -errno; | |
1371 | ||
bf3f1271 LP |
1372 | /* RFC 4795, section 2.5 recommends setting the TTL of UDP packets to 255. */ |
1373 | r = setsockopt(m->llmnr_ipv4_udp_fd, IPPROTO_IP, IP_TTL, &ttl, sizeof(ttl)); | |
1716f6dc LP |
1374 | if (r < 0) { |
1375 | r = -errno; | |
1376 | goto fail; | |
1377 | } | |
1378 | ||
bf3f1271 | 1379 | r = setsockopt(m->llmnr_ipv4_udp_fd, IPPROTO_IP, IP_MULTICAST_TTL, &ttl, sizeof(ttl)); |
1716f6dc LP |
1380 | if (r < 0) { |
1381 | r = -errno; | |
1382 | goto fail; | |
1383 | } | |
1384 | ||
1385 | r = setsockopt(m->llmnr_ipv4_udp_fd, IPPROTO_IP, IP_MULTICAST_LOOP, &one, sizeof(one)); | |
1386 | if (r < 0) { | |
1387 | r = -errno; | |
1388 | goto fail; | |
1389 | } | |
1390 | ||
1391 | r = setsockopt(m->llmnr_ipv4_udp_fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)); | |
1392 | if (r < 0) { | |
1393 | r = -errno; | |
1394 | goto fail; | |
1395 | } | |
1396 | ||
1397 | r = setsockopt(m->llmnr_ipv4_udp_fd, IPPROTO_IP, IP_PKTINFO, &one, sizeof(one)); | |
1398 | if (r < 0) { | |
1399 | r = -errno; | |
1400 | goto fail; | |
1401 | } | |
1402 | ||
1403 | r = setsockopt(m->llmnr_ipv4_udp_fd, IPPROTO_IP, IP_RECVTTL, &one, sizeof(one)); | |
1404 | if (r < 0) { | |
1405 | r = -errno; | |
1406 | goto fail; | |
1407 | } | |
1408 | ||
1409 | /* Disable Don't-Fragment bit in the IP header */ | |
1410 | r = setsockopt(m->llmnr_ipv4_udp_fd, IPPROTO_IP, IP_MTU_DISCOVER, &pmtu, sizeof(pmtu)); | |
1411 | if (r < 0) { | |
1412 | r = -errno; | |
1413 | goto fail; | |
1414 | } | |
1415 | ||
1416 | r = bind(m->llmnr_ipv4_udp_fd, &sa.sa, sizeof(sa.in)); | |
1417 | if (r < 0) { | |
1418 | r = -errno; | |
1419 | goto fail; | |
1420 | } | |
1421 | ||
1422 | r = sd_event_add_io(m->event, &m->llmnr_ipv4_udp_event_source, m->llmnr_ipv4_udp_fd, EPOLLIN, on_llmnr_packet, m); | |
1423 | if (r < 0) | |
1424 | goto fail; | |
1425 | ||
1426 | return m->llmnr_ipv4_udp_fd; | |
1427 | ||
1428 | fail: | |
1429 | m->llmnr_ipv4_udp_fd = safe_close(m->llmnr_ipv4_udp_fd); | |
1430 | return r; | |
1431 | } | |
1432 | ||
1433 | int manager_llmnr_ipv6_udp_fd(Manager *m) { | |
1434 | union sockaddr_union sa = { | |
1435 | .in6.sin6_family = AF_INET6, | |
1436 | .in6.sin6_port = htobe16(5355), | |
1437 | }; | |
bf3f1271 | 1438 | static const int one = 1, ttl = 255; |
1716f6dc LP |
1439 | int r; |
1440 | ||
1441 | assert(m); | |
1442 | ||
1443 | if (m->llmnr_ipv6_udp_fd >= 0) | |
1444 | return m->llmnr_ipv6_udp_fd; | |
1445 | ||
1446 | m->llmnr_ipv6_udp_fd = socket(AF_INET6, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); | |
1447 | if (m->llmnr_ipv6_udp_fd < 0) | |
1448 | return -errno; | |
1449 | ||
bf3f1271 | 1450 | r = setsockopt(m->llmnr_ipv6_udp_fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &ttl, sizeof(ttl)); |
1716f6dc LP |
1451 | if (r < 0) { |
1452 | r = -errno; | |
1453 | goto fail; | |
1454 | } | |
1455 | ||
bf3f1271 LP |
1456 | /* RFC 4795, section 2.5 recommends setting the TTL of UDP packets to 255. */ |
1457 | r = setsockopt(m->llmnr_ipv6_udp_fd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &ttl, sizeof(ttl)); | |
1716f6dc LP |
1458 | if (r < 0) { |
1459 | r = -errno; | |
1460 | goto fail; | |
1461 | } | |
1462 | ||
1463 | r = setsockopt(m->llmnr_ipv6_udp_fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &one, sizeof(one)); | |
1464 | if (r < 0) { | |
1465 | r = -errno; | |
1466 | goto fail; | |
1467 | } | |
1468 | ||
1469 | r = setsockopt(m->llmnr_ipv6_udp_fd, IPPROTO_IPV6, IPV6_V6ONLY, &one, sizeof(one)); | |
1470 | if (r < 0) { | |
1471 | r = -errno; | |
1472 | goto fail; | |
1473 | } | |
1474 | ||
1475 | r = setsockopt(m->llmnr_ipv6_udp_fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)); | |
1476 | if (r < 0) { | |
1477 | r = -errno; | |
1478 | goto fail; | |
1479 | } | |
1480 | ||
1481 | r = setsockopt(m->llmnr_ipv6_udp_fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, &one, sizeof(one)); | |
1482 | if (r < 0) { | |
1483 | r = -errno; | |
1484 | goto fail; | |
1485 | } | |
1486 | ||
1487 | r = setsockopt(m->llmnr_ipv6_udp_fd, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &one, sizeof(one)); | |
1488 | if (r < 0) { | |
1489 | r = -errno; | |
1490 | goto fail; | |
1491 | } | |
1492 | ||
1493 | r = bind(m->llmnr_ipv6_udp_fd, &sa.sa, sizeof(sa.in6)); | |
1494 | if (r < 0) { | |
1495 | r = -errno; | |
1496 | goto fail; | |
1497 | } | |
1498 | ||
1499 | r = sd_event_add_io(m->event, &m->llmnr_ipv6_udp_event_source, m->llmnr_ipv6_udp_fd, EPOLLIN, on_llmnr_packet, m); | |
1500 | if (r < 0) { | |
1501 | r = -errno; | |
1502 | goto fail; | |
1503 | } | |
1504 | ||
1505 | return m->llmnr_ipv6_udp_fd; | |
1506 | ||
1507 | fail: | |
1508 | m->llmnr_ipv6_udp_fd = safe_close(m->llmnr_ipv6_udp_fd); | |
1509 | return r; | |
1510 | } | |
623a4c97 LP |
1511 | |
1512 | static int on_llmnr_stream_packet(DnsStream *s) { | |
a4076574 | 1513 | DnsScope *scope; |
623a4c97 | 1514 | |
a4076574 | 1515 | assert(s); |
623a4c97 | 1516 | |
a4076574 LP |
1517 | scope = manager_find_scope(s->manager, s->read_packet); |
1518 | if (!scope) { | |
1519 | log_warning("Got LLMNR TCP packet on unknown scope. Ignroing."); | |
1520 | return 0; | |
1521 | } | |
623a4c97 | 1522 | |
a4076574 LP |
1523 | if (dns_packet_validate_query(s->read_packet) > 0) { |
1524 | log_debug("Got query packet for id %u", DNS_PACKET_ID(s->read_packet)); | |
623a4c97 | 1525 | |
a4076574 | 1526 | dns_scope_process_query(scope, s, s->read_packet); |
623a4c97 | 1527 | |
a4076574 LP |
1528 | /* If no reply packet was set, we free the stream */ |
1529 | if (s->write_packet) | |
1530 | return 0; | |
1531 | } else | |
1532 | log_debug("Invalid LLMNR TCP packet."); | |
623a4c97 LP |
1533 | |
1534 | dns_stream_free(s); | |
1535 | return 0; | |
1536 | } | |
1537 | ||
1538 | static int on_llmnr_stream(sd_event_source *s, int fd, uint32_t revents, void *userdata) { | |
1539 | DnsStream *stream; | |
1540 | Manager *m = userdata; | |
1541 | int cfd, r; | |
1542 | ||
1543 | cfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC); | |
1544 | if (cfd < 0) { | |
1545 | if (errno == EAGAIN || errno == EINTR) | |
1546 | return 0; | |
1547 | ||
1548 | return -errno; | |
1549 | } | |
1550 | ||
1551 | r = dns_stream_new(m, &stream, DNS_PROTOCOL_LLMNR, cfd); | |
1552 | if (r < 0) { | |
1553 | safe_close(cfd); | |
1554 | return r; | |
1555 | } | |
1556 | ||
1557 | stream->on_packet = on_llmnr_stream_packet; | |
1558 | return 0; | |
1559 | } | |
1560 | ||
1561 | int manager_llmnr_ipv4_tcp_fd(Manager *m) { | |
1562 | union sockaddr_union sa = { | |
1563 | .in.sin_family = AF_INET, | |
1564 | .in.sin_port = htobe16(5355), | |
1565 | }; | |
1566 | static const int one = 1, pmtu = IP_PMTUDISC_DONT; | |
1567 | int r; | |
1568 | ||
1569 | assert(m); | |
1570 | ||
1571 | if (m->llmnr_ipv4_tcp_fd >= 0) | |
1572 | return m->llmnr_ipv4_tcp_fd; | |
1573 | ||
1574 | m->llmnr_ipv4_tcp_fd = socket(AF_INET, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); | |
1575 | if (m->llmnr_ipv4_tcp_fd < 0) | |
1576 | return -errno; | |
1577 | ||
bf3f1271 | 1578 | /* RFC 4795, section 2.5. requires setting the TTL of TCP streams to 1 */ |
623a4c97 LP |
1579 | r = setsockopt(m->llmnr_ipv4_tcp_fd, IPPROTO_IP, IP_TTL, &one, sizeof(one)); |
1580 | if (r < 0) { | |
1581 | r = -errno; | |
1582 | goto fail; | |
1583 | } | |
1584 | ||
1585 | r = setsockopt(m->llmnr_ipv4_tcp_fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)); | |
1586 | if (r < 0) { | |
1587 | r = -errno; | |
1588 | goto fail; | |
1589 | } | |
1590 | ||
1591 | r = setsockopt(m->llmnr_ipv4_tcp_fd, IPPROTO_IP, IP_PKTINFO, &one, sizeof(one)); | |
1592 | if (r < 0) { | |
1593 | r = -errno; | |
1594 | goto fail; | |
1595 | } | |
1596 | ||
1597 | r = setsockopt(m->llmnr_ipv4_tcp_fd, IPPROTO_IP, IP_RECVTTL, &one, sizeof(one)); | |
1598 | if (r < 0) { | |
1599 | r = -errno; | |
1600 | goto fail; | |
1601 | } | |
1602 | ||
1603 | /* Disable Don't-Fragment bit in the IP header */ | |
1604 | r = setsockopt(m->llmnr_ipv4_tcp_fd, IPPROTO_IP, IP_MTU_DISCOVER, &pmtu, sizeof(pmtu)); | |
1605 | if (r < 0) { | |
1606 | r = -errno; | |
1607 | goto fail; | |
1608 | } | |
1609 | ||
1610 | r = bind(m->llmnr_ipv4_tcp_fd, &sa.sa, sizeof(sa.in)); | |
1611 | if (r < 0) { | |
1612 | r = -errno; | |
1613 | goto fail; | |
1614 | } | |
1615 | ||
1616 | r = listen(m->llmnr_ipv4_tcp_fd, SOMAXCONN); | |
1617 | if (r < 0) { | |
1618 | r = -errno; | |
1619 | goto fail; | |
1620 | } | |
1621 | ||
1622 | r = sd_event_add_io(m->event, &m->llmnr_ipv4_tcp_event_source, m->llmnr_ipv4_tcp_fd, EPOLLIN, on_llmnr_stream, m); | |
1623 | if (r < 0) | |
1624 | goto fail; | |
1625 | ||
1626 | return m->llmnr_ipv4_tcp_fd; | |
1627 | ||
1628 | fail: | |
1629 | m->llmnr_ipv4_tcp_fd = safe_close(m->llmnr_ipv4_tcp_fd); | |
1630 | return r; | |
1631 | } | |
1632 | ||
1633 | int manager_llmnr_ipv6_tcp_fd(Manager *m) { | |
1634 | union sockaddr_union sa = { | |
1635 | .in6.sin6_family = AF_INET6, | |
1636 | .in6.sin6_port = htobe16(5355), | |
1637 | }; | |
1638 | static const int one = 1; | |
1639 | int r; | |
1640 | ||
1641 | assert(m); | |
1642 | ||
1643 | if (m->llmnr_ipv6_tcp_fd >= 0) | |
1644 | return m->llmnr_ipv6_tcp_fd; | |
1645 | ||
1646 | m->llmnr_ipv6_tcp_fd = socket(AF_INET6, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); | |
1647 | if (m->llmnr_ipv6_tcp_fd < 0) | |
1648 | return -errno; | |
1649 | ||
bf3f1271 | 1650 | /* RFC 4795, section 2.5. requires setting the TTL of TCP streams to 1 */ |
623a4c97 LP |
1651 | r = setsockopt(m->llmnr_ipv6_tcp_fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &one, sizeof(one)); |
1652 | if (r < 0) { | |
1653 | r = -errno; | |
1654 | goto fail; | |
1655 | } | |
1656 | ||
1657 | r = setsockopt(m->llmnr_ipv6_tcp_fd, IPPROTO_IPV6, IPV6_V6ONLY, &one, sizeof(one)); | |
1658 | if (r < 0) { | |
1659 | r = -errno; | |
1660 | goto fail; | |
1661 | } | |
1662 | ||
1663 | r = setsockopt(m->llmnr_ipv6_tcp_fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)); | |
1664 | if (r < 0) { | |
1665 | r = -errno; | |
1666 | goto fail; | |
1667 | } | |
1668 | ||
1669 | r = setsockopt(m->llmnr_ipv6_tcp_fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, &one, sizeof(one)); | |
1670 | if (r < 0) { | |
1671 | r = -errno; | |
1672 | goto fail; | |
1673 | } | |
1674 | ||
1675 | r = setsockopt(m->llmnr_ipv6_tcp_fd, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &one, sizeof(one)); | |
1676 | if (r < 0) { | |
1677 | r = -errno; | |
1678 | goto fail; | |
1679 | } | |
1680 | ||
1681 | r = bind(m->llmnr_ipv6_tcp_fd, &sa.sa, sizeof(sa.in6)); | |
1682 | if (r < 0) { | |
1683 | r = -errno; | |
1684 | goto fail; | |
1685 | } | |
1686 | ||
1687 | r = listen(m->llmnr_ipv6_tcp_fd, SOMAXCONN); | |
1688 | if (r < 0) { | |
1689 | r = -errno; | |
1690 | goto fail; | |
1691 | } | |
1692 | ||
1693 | r = sd_event_add_io(m->event, &m->llmnr_ipv6_tcp_event_source, m->llmnr_ipv6_tcp_fd, EPOLLIN, on_llmnr_stream, m); | |
1694 | if (r < 0) { | |
1695 | r = -errno; | |
1696 | goto fail; | |
1697 | } | |
1698 | ||
1699 | return m->llmnr_ipv6_tcp_fd; | |
1700 | ||
1701 | fail: | |
1702 | m->llmnr_ipv6_tcp_fd = safe_close(m->llmnr_ipv6_tcp_fd); | |
1703 | return r; | |
1704 | } | |
1705 | ||
623a4c97 | 1706 | int manager_find_ifindex(Manager *m, int family, const union in_addr_union *in_addr) { |
ec2c5e43 LP |
1707 | LinkAddress *a; |
1708 | ||
1709 | assert(m); | |
1710 | ||
4e945a6f | 1711 | a = manager_find_link_address(m, family, in_addr); |
ec2c5e43 LP |
1712 | if (a) |
1713 | return a->link->ifindex; | |
1714 | ||
1715 | return 0; | |
1716 | } | |
1717 | ||
eb60f9cd LP |
1718 | void manager_refresh_rrs(Manager *m) { |
1719 | Iterator i; | |
1720 | Link *l; | |
1721 | ||
1722 | assert(m); | |
1723 | ||
1724 | m->host_ipv4_key = dns_resource_key_unref(m->host_ipv4_key); | |
1725 | m->host_ipv6_key = dns_resource_key_unref(m->host_ipv6_key); | |
1726 | ||
1727 | HASHMAP_FOREACH(l, m->links, i) { | |
1728 | link_add_rrs(l, true); | |
1729 | link_add_rrs(l, false); | |
1730 | } | |
1731 | } | |
1732 | ||
ec2c5e43 LP |
1733 | int manager_next_hostname(Manager *m) { |
1734 | const char *p; | |
556a2294 | 1735 | uint64_t u, a; |
ec2c5e43 | 1736 | char *h; |
623a4c97 LP |
1737 | |
1738 | assert(m); | |
1739 | ||
ec2c5e43 LP |
1740 | p = strchr(m->hostname, 0); |
1741 | assert(p); | |
1742 | ||
1743 | while (p > m->hostname) { | |
1744 | if (!strchr("0123456789", p[-1])) | |
1745 | break; | |
1746 | ||
1747 | p--; | |
1748 | } | |
1749 | ||
1750 | if (*p == 0 || safe_atou64(p, &u) < 0 || u <= 0) | |
1751 | u = 1; | |
1752 | ||
556a2294 LP |
1753 | /* Add a random number to the old value. This way we can avoid |
1754 | * that two hosts pick the same hostname, win on IPv4 and lose | |
1755 | * on IPv6 (or vice versa), and pick the same hostname | |
1756 | * replacement hostname, ad infinitum. We still want the | |
1757 | * numbers to go up monotonically, hence we just add a random | |
1758 | * value 1..10 */ | |
1759 | ||
1760 | random_bytes(&a, sizeof(a)); | |
1761 | u += 1 + a % 10; | |
ec2c5e43 LP |
1762 | |
1763 | if (asprintf(&h, "%.*s%" PRIu64, (int) (p - m->hostname), m->hostname, u) < 0) | |
1764 | return -ENOMEM; | |
1765 | ||
eb60f9cd | 1766 | log_info("Hostname conflict, changing published hostname from '%s' to '%s'.", m->hostname, h); |
ec2c5e43 LP |
1767 | |
1768 | free(m->hostname); | |
1769 | m->hostname = h; | |
1770 | ||
eb60f9cd | 1771 | manager_refresh_rrs(m); |
623a4c97 LP |
1772 | |
1773 | return 0; | |
1774 | } | |
ec2c5e43 | 1775 | |
4e945a6f | 1776 | LinkAddress* manager_find_link_address(Manager *m, int family, const union in_addr_union *in_addr) { |
ec2c5e43 LP |
1777 | Iterator i; |
1778 | Link *l; | |
1779 | ||
1780 | assert(m); | |
1781 | ||
1782 | HASHMAP_FOREACH(l, m->links, i) { | |
1783 | LinkAddress *a; | |
1784 | ||
1785 | a = link_find_address(l, family, in_addr); | |
1786 | if (a) | |
1787 | return a; | |
1788 | } | |
1789 | ||
1790 | return NULL; | |
1791 | } | |
1792 | ||
a4076574 | 1793 | bool manager_our_packet(Manager *m, DnsPacket *p) { |
ec2c5e43 LP |
1794 | assert(m); |
1795 | assert(p); | |
1796 | ||
4e945a6f | 1797 | return !!manager_find_link_address(m, p->family, &p->sender); |
ec2c5e43 | 1798 | } |
4e945a6f | 1799 | |
a4076574 LP |
1800 | DnsScope* manager_find_scope(Manager *m, DnsPacket *p) { |
1801 | Link *l; | |
1802 | ||
1803 | assert(m); | |
1804 | assert(p); | |
1805 | ||
1806 | l = hashmap_get(m->links, INT_TO_PTR(p->ifindex)); | |
1807 | if (!l) | |
1808 | return NULL; | |
1809 | ||
1810 | if (p->protocol == DNS_PROTOCOL_LLMNR) { | |
1811 | if (p->family == AF_INET) | |
1812 | return l->llmnr_ipv4_scope; | |
1813 | else if (p->family == AF_INET6) | |
1814 | return l->llmnr_ipv6_scope; | |
1815 | } | |
1816 | ||
1817 | return NULL; | |
1818 | } | |
1819 | ||
902bb5d8 LP |
1820 | void manager_verify_all(Manager *m) { |
1821 | DnsScope *s; | |
1822 | ||
1823 | assert(m); | |
1824 | ||
1825 | LIST_FOREACH(scopes, s, m->dns_scopes) | |
1826 | dns_zone_verify_all(&s->zone); | |
1827 | } | |
1828 | ||
3e684349 LP |
1829 | void manager_flush_dns_servers(Manager *m, DnsServerType t) { |
1830 | assert(m); | |
1831 | ||
1832 | if (t == DNS_SERVER_SYSTEM) | |
1833 | while (m->dns_servers) | |
1834 | dns_server_free(m->dns_servers); | |
1835 | ||
1836 | if (t == DNS_SERVER_FALLBACK) | |
1837 | while (m->fallback_dns_servers) | |
1838 | dns_server_free(m->fallback_dns_servers); | |
1839 | } | |
1840 | ||
4e945a6f LP |
1841 | static const char* const support_table[_SUPPORT_MAX] = { |
1842 | [SUPPORT_NO] = "no", | |
1843 | [SUPPORT_YES] = "yes", | |
1844 | [SUPPORT_RESOLVE] = "resolve", | |
1845 | }; | |
1846 | DEFINE_STRING_TABLE_LOOKUP(support, Support); |