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091a364c TG |
1 | /*** |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright 2014 Tom Gundersen <teg@jklm.no> | |
5 | ||
6 | systemd is free software; you can redistribute it and/or modify it | |
7 | under the terms of the GNU Lesser General Public License as published by | |
8 | the Free Software Foundation; either version 2.1 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | systemd is distributed in the hope that it will be useful, but | |
12 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public License | |
17 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
18 | ***/ | |
19 | ||
07630cea LP |
20 | #include <netinet/in.h> |
21 | #include <poll.h> | |
74b2466e | 22 | #include <sys/ioctl.h> |
091a364c | 23 | |
a2a416f7 | 24 | #include "af-list.h" |
b5efdb8a | 25 | #include "alloc-util.h" |
943ef07c | 26 | #include "dirent-util.h" |
07630cea | 27 | #include "dns-domain.h" |
3ffd4af2 | 28 | #include "fd-util.h" |
a5a807e6 | 29 | #include "fileio-label.h" |
07630cea | 30 | #include "hostname-util.h" |
c004493c | 31 | #include "io-util.h" |
07630cea LP |
32 | #include "netlink-util.h" |
33 | #include "network-internal.h" | |
822db23c | 34 | #include "ordered-set.h" |
6bedfcbb | 35 | #include "parse-util.h" |
3df3e884 | 36 | #include "random-util.h" |
39d8db04 | 37 | #include "resolved-bus.h" |
07630cea | 38 | #include "resolved-conf.h" |
b30bf55d | 39 | #include "resolved-dns-stub.h" |
dd0bc0f1 | 40 | #include "resolved-etc-hosts.h" |
5f402ae8 | 41 | #include "resolved-llmnr.h" |
07630cea | 42 | #include "resolved-manager.h" |
bc7702b0 | 43 | #include "resolved-mdns.h" |
dd0bc0f1 | 44 | #include "resolved-resolv-conf.h" |
07630cea | 45 | #include "socket-util.h" |
8b43440b | 46 | #include "string-table.h" |
07630cea LP |
47 | #include "string-util.h" |
48 | #include "utf8.h" | |
74b2466e LP |
49 | |
50 | #define SEND_TIMEOUT_USEC (200 * USEC_PER_MSEC) | |
51 | ||
1c4baffc | 52 | static int manager_process_link(sd_netlink *rtnl, sd_netlink_message *mm, void *userdata) { |
74b2466e LP |
53 | Manager *m = userdata; |
54 | uint16_t type; | |
55 | Link *l; | |
56 | int ifindex, r; | |
57 | ||
58 | assert(rtnl); | |
59 | assert(m); | |
60 | assert(mm); | |
61 | ||
1c4baffc | 62 | r = sd_netlink_message_get_type(mm, &type); |
74b2466e LP |
63 | if (r < 0) |
64 | goto fail; | |
65 | ||
66 | r = sd_rtnl_message_link_get_ifindex(mm, &ifindex); | |
67 | if (r < 0) | |
68 | goto fail; | |
69 | ||
70 | l = hashmap_get(m->links, INT_TO_PTR(ifindex)); | |
71 | ||
72 | switch (type) { | |
73 | ||
a2a416f7 LP |
74 | case RTM_NEWLINK:{ |
75 | bool is_new = !l; | |
74b2466e | 76 | |
a2a416f7 | 77 | if (!l) { |
74b2466e LP |
78 | r = link_new(m, &l, ifindex); |
79 | if (r < 0) | |
80 | goto fail; | |
81 | } | |
82 | ||
943ef07c | 83 | r = link_process_rtnl(l, mm); |
74b2466e LP |
84 | if (r < 0) |
85 | goto fail; | |
86 | ||
943ef07c | 87 | r = link_update(l); |
21d73c87 LP |
88 | if (r < 0) |
89 | goto fail; | |
90 | ||
a2a416f7 LP |
91 | if (is_new) |
92 | log_debug("Found new link %i/%s", ifindex, l->name); | |
93 | ||
74b2466e | 94 | break; |
a2a416f7 | 95 | } |
74b2466e LP |
96 | |
97 | case RTM_DELLINK: | |
98 | if (l) { | |
a2a416f7 | 99 | log_debug("Removing link %i/%s", l->ifindex, l->name); |
943ef07c | 100 | link_remove_user(l); |
74b2466e LP |
101 | link_free(l); |
102 | } | |
103 | ||
104 | break; | |
105 | } | |
106 | ||
107 | return 0; | |
108 | ||
109 | fail: | |
da927ba9 | 110 | log_warning_errno(r, "Failed to process RTNL link message: %m"); |
74b2466e LP |
111 | return 0; |
112 | } | |
113 | ||
1c4baffc | 114 | static int manager_process_address(sd_netlink *rtnl, sd_netlink_message *mm, void *userdata) { |
74b2466e LP |
115 | Manager *m = userdata; |
116 | union in_addr_union address; | |
74b2466e | 117 | uint16_t type; |
0dd25fb9 | 118 | int r, ifindex, family; |
74b2466e LP |
119 | LinkAddress *a; |
120 | Link *l; | |
121 | ||
122 | assert(rtnl); | |
123 | assert(mm); | |
124 | assert(m); | |
125 | ||
1c4baffc | 126 | r = sd_netlink_message_get_type(mm, &type); |
74b2466e LP |
127 | if (r < 0) |
128 | goto fail; | |
129 | ||
130 | r = sd_rtnl_message_addr_get_ifindex(mm, &ifindex); | |
131 | if (r < 0) | |
132 | goto fail; | |
133 | ||
134 | l = hashmap_get(m->links, INT_TO_PTR(ifindex)); | |
135 | if (!l) | |
136 | return 0; | |
137 | ||
138 | r = sd_rtnl_message_addr_get_family(mm, &family); | |
139 | if (r < 0) | |
140 | goto fail; | |
141 | ||
142 | switch (family) { | |
143 | ||
144 | case AF_INET: | |
1c4baffc | 145 | r = sd_netlink_message_read_in_addr(mm, IFA_LOCAL, &address.in); |
74b2466e | 146 | if (r < 0) { |
1c4baffc | 147 | r = sd_netlink_message_read_in_addr(mm, IFA_ADDRESS, &address.in); |
74b2466e LP |
148 | if (r < 0) |
149 | goto fail; | |
150 | } | |
151 | ||
152 | break; | |
153 | ||
154 | case AF_INET6: | |
1c4baffc | 155 | r = sd_netlink_message_read_in6_addr(mm, IFA_LOCAL, &address.in6); |
74b2466e | 156 | if (r < 0) { |
1c4baffc | 157 | r = sd_netlink_message_read_in6_addr(mm, IFA_ADDRESS, &address.in6); |
74b2466e LP |
158 | if (r < 0) |
159 | goto fail; | |
160 | } | |
161 | ||
162 | break; | |
163 | ||
164 | default: | |
165 | return 0; | |
166 | } | |
167 | ||
168 | a = link_find_address(l, family, &address); | |
169 | ||
170 | switch (type) { | |
171 | ||
172 | case RTM_NEWADDR: | |
173 | ||
174 | if (!a) { | |
175 | r = link_address_new(l, &a, family, &address); | |
176 | if (r < 0) | |
177 | return r; | |
178 | } | |
179 | ||
180 | r = link_address_update_rtnl(a, mm); | |
181 | if (r < 0) | |
182 | return r; | |
183 | ||
184 | break; | |
185 | ||
186 | case RTM_DELADDR: | |
3e044c49 | 187 | link_address_free(a); |
74b2466e LP |
188 | break; |
189 | } | |
190 | ||
191 | return 0; | |
192 | ||
193 | fail: | |
da927ba9 | 194 | log_warning_errno(r, "Failed to process RTNL address message: %m"); |
74b2466e LP |
195 | return 0; |
196 | } | |
197 | ||
74b2466e | 198 | static int manager_rtnl_listen(Manager *m) { |
4afd3348 | 199 | _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL; |
1c4baffc | 200 | sd_netlink_message *i; |
74b2466e LP |
201 | int r; |
202 | ||
203 | assert(m); | |
204 | ||
cc98b302 | 205 | /* First, subscribe to interfaces coming and going */ |
1c4baffc | 206 | r = sd_netlink_open(&m->rtnl); |
74b2466e LP |
207 | if (r < 0) |
208 | return r; | |
209 | ||
2d895038 | 210 | r = sd_netlink_attach_event(m->rtnl, m->event, SD_EVENT_PRIORITY_IMPORTANT); |
74b2466e LP |
211 | if (r < 0) |
212 | return r; | |
213 | ||
1c4baffc | 214 | r = sd_netlink_add_match(m->rtnl, RTM_NEWLINK, manager_process_link, m); |
74b2466e LP |
215 | if (r < 0) |
216 | return r; | |
217 | ||
1c4baffc | 218 | r = sd_netlink_add_match(m->rtnl, RTM_DELLINK, manager_process_link, m); |
74b2466e LP |
219 | if (r < 0) |
220 | return r; | |
221 | ||
1c4baffc | 222 | r = sd_netlink_add_match(m->rtnl, RTM_NEWADDR, manager_process_address, m); |
74b2466e LP |
223 | if (r < 0) |
224 | return r; | |
091a364c | 225 | |
1c4baffc | 226 | r = sd_netlink_add_match(m->rtnl, RTM_DELADDR, manager_process_address, m); |
74b2466e LP |
227 | if (r < 0) |
228 | return r; | |
229 | ||
230 | /* Then, enumerate all links */ | |
231 | r = sd_rtnl_message_new_link(m->rtnl, &req, RTM_GETLINK, 0); | |
232 | if (r < 0) | |
233 | return r; | |
234 | ||
1c4baffc | 235 | r = sd_netlink_message_request_dump(req, true); |
74b2466e LP |
236 | if (r < 0) |
237 | return r; | |
238 | ||
1c4baffc | 239 | r = sd_netlink_call(m->rtnl, req, 0, &reply); |
74b2466e LP |
240 | if (r < 0) |
241 | return r; | |
242 | ||
1c4baffc | 243 | for (i = reply; i; i = sd_netlink_message_next(i)) { |
74b2466e LP |
244 | r = manager_process_link(m->rtnl, i, m); |
245 | if (r < 0) | |
246 | return r; | |
247 | } | |
248 | ||
1c4baffc TG |
249 | req = sd_netlink_message_unref(req); |
250 | reply = sd_netlink_message_unref(reply); | |
74b2466e LP |
251 | |
252 | /* Finally, enumerate all addresses, too */ | |
253 | r = sd_rtnl_message_new_addr(m->rtnl, &req, RTM_GETADDR, 0, AF_UNSPEC); | |
254 | if (r < 0) | |
255 | return r; | |
256 | ||
1c4baffc | 257 | r = sd_netlink_message_request_dump(req, true); |
74b2466e LP |
258 | if (r < 0) |
259 | return r; | |
260 | ||
1c4baffc | 261 | r = sd_netlink_call(m->rtnl, req, 0, &reply); |
74b2466e LP |
262 | if (r < 0) |
263 | return r; | |
264 | ||
1c4baffc | 265 | for (i = reply; i; i = sd_netlink_message_next(i)) { |
74b2466e LP |
266 | r = manager_process_address(m->rtnl, i, m); |
267 | if (r < 0) | |
268 | return r; | |
269 | } | |
270 | ||
271 | return r; | |
272 | } | |
273 | ||
274 | static int on_network_event(sd_event_source *s, int fd, uint32_t revents, void *userdata) { | |
275 | Manager *m = userdata; | |
276 | Iterator i; | |
277 | Link *l; | |
278 | int r; | |
279 | ||
280 | assert(m); | |
281 | ||
282 | sd_network_monitor_flush(m->network_monitor); | |
283 | ||
284 | HASHMAP_FOREACH(l, m->links, i) { | |
943ef07c | 285 | r = link_update(l); |
74b2466e | 286 | if (r < 0) |
da927ba9 | 287 | log_warning_errno(r, "Failed to update monitor information for %i: %m", l->ifindex); |
74b2466e LP |
288 | } |
289 | ||
7207052d | 290 | (void) manager_write_resolv_conf(m); |
74b2466e LP |
291 | |
292 | return 0; | |
293 | } | |
294 | ||
295 | static int manager_network_monitor_listen(Manager *m) { | |
296 | int r, fd, events; | |
297 | ||
298 | assert(m); | |
299 | ||
0014a4ad | 300 | r = sd_network_monitor_new(&m->network_monitor, NULL); |
74b2466e LP |
301 | if (r < 0) |
302 | return r; | |
303 | ||
304 | fd = sd_network_monitor_get_fd(m->network_monitor); | |
305 | if (fd < 0) | |
306 | return fd; | |
307 | ||
308 | events = sd_network_monitor_get_events(m->network_monitor); | |
309 | if (events < 0) | |
310 | return events; | |
311 | ||
312 | r = sd_event_add_io(m->event, &m->network_event_source, fd, events, &on_network_event, m); | |
313 | if (r < 0) | |
2d895038 LP |
314 | return r; |
315 | ||
316 | r = sd_event_source_set_priority(m->network_event_source, SD_EVENT_PRIORITY_IMPORTANT+5); | |
317 | if (r < 0) | |
74b2466e LP |
318 | return r; |
319 | ||
aa4a9deb LP |
320 | (void) sd_event_source_set_description(m->network_event_source, "network-monitor"); |
321 | ||
74b2466e LP |
322 | return 0; |
323 | } | |
324 | ||
e96de0ce | 325 | static int determine_hostname(char **full_hostname, char **llmnr_hostname, char **mdns_hostname) { |
eb60f9cd | 326 | _cleanup_free_ char *h = NULL, *n = NULL; |
78c6a153 LP |
327 | char label[DNS_LABEL_MAX]; |
328 | const char *p; | |
329 | int r, k; | |
eb60f9cd | 330 | |
e96de0ce | 331 | assert(full_hostname); |
78c6a153 LP |
332 | assert(llmnr_hostname); |
333 | assert(mdns_hostname); | |
334 | ||
a25b0dc8 | 335 | /* Extract and normalize the first label of the locally configured hostname, and check it's not "localhost". */ |
eb60f9cd | 336 | |
a25b0dc8 LP |
337 | r = gethostname_strict(&h); |
338 | if (r < 0) | |
339 | return log_debug_errno(r, "Can't determine system hostname: %m"); | |
eb60f9cd | 340 | |
78c6a153 LP |
341 | p = h; |
342 | r = dns_label_unescape(&p, label, sizeof(label)); | |
343 | if (r < 0) | |
344 | return log_error_errno(r, "Failed to unescape host name: %m"); | |
345 | if (r == 0) { | |
a25b0dc8 | 346 | log_error("Couldn't find a single label in hostname."); |
78c6a153 LP |
347 | return -EINVAL; |
348 | } | |
349 | ||
350 | k = dns_label_undo_idna(label, r, label, sizeof(label)); | |
351 | if (k < 0) | |
352 | return log_error_errno(k, "Failed to undo IDNA: %m"); | |
353 | if (k > 0) | |
354 | r = k; | |
355 | ||
356 | if (!utf8_is_valid(label)) { | |
eb60f9cd LP |
357 | log_error("System hostname is not UTF-8 clean."); |
358 | return -EINVAL; | |
359 | } | |
360 | ||
422baca0 | 361 | r = dns_label_escape_new(label, r, &n); |
78c6a153 LP |
362 | if (r < 0) |
363 | return log_error_errno(r, "Failed to escape host name: %m"); | |
364 | ||
365 | if (is_localhost(n)) { | |
366 | log_debug("System hostname is 'localhost', ignoring."); | |
367 | return -EINVAL; | |
eb60f9cd LP |
368 | } |
369 | ||
78c6a153 LP |
370 | r = dns_name_concat(n, "local", mdns_hostname); |
371 | if (r < 0) | |
372 | return log_error_errno(r, "Failed to determine mDNS hostname: %m"); | |
373 | ||
374 | *llmnr_hostname = n; | |
eb60f9cd LP |
375 | n = NULL; |
376 | ||
e96de0ce LP |
377 | *full_hostname = h; |
378 | h = NULL; | |
379 | ||
eb60f9cd LP |
380 | return 0; |
381 | } | |
382 | ||
a25b0dc8 LP |
383 | static const char *fallback_hostname(void) { |
384 | ||
385 | /* Determine the fall back hostname. For exposing this system to the outside world, we cannot have it to be | |
386 | * "localhost" even if that's the compiled in hostname. In this case, let's revert to "linux" instead. */ | |
387 | ||
388 | if (is_localhost(FALLBACK_HOSTNAME)) | |
389 | return "linux"; | |
390 | ||
391 | return FALLBACK_HOSTNAME; | |
392 | } | |
393 | ||
394 | static int make_fallback_hostnames(char **full_hostname, char **llmnr_hostname, char **mdns_hostname) { | |
395 | _cleanup_free_ char *n = NULL, *m = NULL; | |
396 | char label[DNS_LABEL_MAX], *h; | |
397 | const char *p; | |
398 | int r; | |
399 | ||
400 | assert(full_hostname); | |
401 | assert(llmnr_hostname); | |
402 | assert(mdns_hostname); | |
403 | ||
404 | p = fallback_hostname(); | |
405 | r = dns_label_unescape(&p, label, sizeof(label)); | |
406 | if (r < 0) | |
407 | return log_error_errno(r, "Failed to unescape fallback host name: %m"); | |
408 | ||
409 | assert(r > 0); /* The fallback hostname must have at least one label */ | |
410 | ||
411 | r = dns_label_escape_new(label, r, &n); | |
412 | if (r < 0) | |
413 | return log_error_errno(r, "Failed to escape fallback hostname: %m"); | |
414 | ||
415 | r = dns_name_concat(n, "local", &m); | |
416 | if (r < 0) | |
417 | return log_error_errno(r, "Failed to concatenate mDNS hostname: %m"); | |
418 | ||
419 | h = strdup(fallback_hostname()); | |
420 | if (!h) | |
421 | return log_oom(); | |
422 | ||
423 | *llmnr_hostname = n; | |
424 | n = NULL; | |
425 | ||
426 | *mdns_hostname = m; | |
427 | m = NULL; | |
428 | ||
429 | *full_hostname = h; | |
430 | ||
431 | return 0; | |
432 | } | |
433 | ||
eb60f9cd | 434 | static int on_hostname_change(sd_event_source *es, int fd, uint32_t revents, void *userdata) { |
e96de0ce | 435 | _cleanup_free_ char *full_hostname = NULL, *llmnr_hostname = NULL, *mdns_hostname = NULL; |
eb60f9cd LP |
436 | Manager *m = userdata; |
437 | int r; | |
438 | ||
439 | assert(m); | |
440 | ||
e96de0ce | 441 | r = determine_hostname(&full_hostname, &llmnr_hostname, &mdns_hostname); |
eb60f9cd LP |
442 | if (r < 0) |
443 | return 0; /* ignore invalid hostnames */ | |
444 | ||
e96de0ce LP |
445 | if (streq(full_hostname, m->full_hostname) && |
446 | streq(llmnr_hostname, m->llmnr_hostname) && | |
447 | streq(mdns_hostname, m->mdns_hostname)) | |
eb60f9cd LP |
448 | return 0; |
449 | ||
e96de0ce | 450 | log_info("System hostname changed to '%s'.", full_hostname); |
78c6a153 | 451 | |
e96de0ce LP |
452 | free_and_replace(m->full_hostname, full_hostname); |
453 | free_and_replace(m->llmnr_hostname, llmnr_hostname); | |
454 | free_and_replace(m->mdns_hostname, mdns_hostname); | |
eb60f9cd LP |
455 | |
456 | manager_refresh_rrs(m); | |
457 | ||
458 | return 0; | |
459 | } | |
460 | ||
461 | static int manager_watch_hostname(Manager *m) { | |
eb60f9cd LP |
462 | int r; |
463 | ||
464 | assert(m); | |
465 | ||
466 | m->hostname_fd = open("/proc/sys/kernel/hostname", O_RDONLY|O_CLOEXEC|O_NDELAY|O_NOCTTY); | |
467 | if (m->hostname_fd < 0) { | |
56f64d95 | 468 | log_warning_errno(errno, "Failed to watch hostname: %m"); |
eb60f9cd LP |
469 | return 0; |
470 | } | |
471 | ||
472 | r = sd_event_add_io(m->event, &m->hostname_event_source, m->hostname_fd, 0, on_hostname_change, m); | |
473 | if (r < 0) { | |
474 | if (r == -EPERM) | |
475 | /* kernels prior to 3.2 don't support polling this file. Ignore the failure. */ | |
476 | m->hostname_fd = safe_close(m->hostname_fd); | |
8d3d7072 MS |
477 | else |
478 | return log_error_errno(r, "Failed to add hostname event source: %m"); | |
eb60f9cd LP |
479 | } |
480 | ||
aa4a9deb LP |
481 | (void) sd_event_source_set_description(m->hostname_event_source, "hostname"); |
482 | ||
e96de0ce | 483 | r = determine_hostname(&m->full_hostname, &m->llmnr_hostname, &m->mdns_hostname); |
eb60f9cd | 484 | if (r < 0) { |
a25b0dc8 | 485 | log_info("Defaulting to hostname '%s'.", fallback_hostname()); |
78c6a153 | 486 | |
a25b0dc8 LP |
487 | r = make_fallback_hostnames(&m->full_hostname, &m->llmnr_hostname, &m->mdns_hostname); |
488 | if (r < 0) | |
489 | return r; | |
eb60f9cd | 490 | } else |
e96de0ce | 491 | log_info("Using system hostname '%s'.", m->full_hostname); |
eb60f9cd LP |
492 | |
493 | return 0; | |
494 | } | |
495 | ||
4d506d6b LP |
496 | static int manager_sigusr1(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { |
497 | _cleanup_free_ char *buffer = NULL; | |
498 | _cleanup_fclose_ FILE *f = NULL; | |
499 | Manager *m = userdata; | |
500 | size_t size = 0; | |
501 | DnsScope *scope; | |
502 | ||
503 | assert(s); | |
504 | assert(si); | |
505 | assert(m); | |
506 | ||
507 | f = open_memstream(&buffer, &size); | |
508 | if (!f) | |
509 | return log_oom(); | |
510 | ||
511 | LIST_FOREACH(scopes, scope, m->dns_scopes) | |
512 | dns_scope_dump(scope, f); | |
513 | ||
514 | if (fflush_and_check(f) < 0) | |
515 | return log_oom(); | |
516 | ||
517 | log_dump(LOG_INFO, buffer); | |
518 | return 0; | |
519 | } | |
520 | ||
bc81447e LP |
521 | static int manager_sigusr2(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { |
522 | Manager *m = userdata; | |
bc81447e LP |
523 | |
524 | assert(s); | |
525 | assert(si); | |
526 | assert(m); | |
527 | ||
ba35662f | 528 | manager_flush_caches(m); |
ba35662f | 529 | |
bc81447e LP |
530 | return 0; |
531 | } | |
532 | ||
091a364c | 533 | int manager_new(Manager **ret) { |
74b2466e | 534 | _cleanup_(manager_freep) Manager *m = NULL; |
091a364c TG |
535 | int r; |
536 | ||
c92e531c LP |
537 | assert(ret); |
538 | ||
091a364c TG |
539 | m = new0(Manager, 1); |
540 | if (!m) | |
541 | return -ENOMEM; | |
542 | ||
1716f6dc | 543 | m->llmnr_ipv4_udp_fd = m->llmnr_ipv6_udp_fd = -1; |
623a4c97 | 544 | m->llmnr_ipv4_tcp_fd = m->llmnr_ipv6_tcp_fd = -1; |
bc7702b0 | 545 | m->mdns_ipv4_fd = m->mdns_ipv6_fd = -1; |
b30bf55d | 546 | m->dns_stub_udp_fd = m->dns_stub_tcp_fd = -1; |
eb60f9cd | 547 | m->hostname_fd = -1; |
1716f6dc | 548 | |
af49ca27 | 549 | m->llmnr_support = RESOLVE_SUPPORT_YES; |
7bef8e8e | 550 | m->mdns_support = RESOLVE_SUPPORT_YES; |
61ecb465 | 551 | m->dnssec_mode = DEFAULT_DNSSEC_MODE; |
ceeddf79 | 552 | m->enable_cache = true; |
1ae43295 | 553 | m->dns_stub_listener_mode = DNS_STUB_LISTENER_UDP; |
5cb36f41 | 554 | m->read_resolv_conf = true; |
00fa60ae | 555 | m->need_builtin_fallbacks = true; |
dd0bc0f1 | 556 | m->etc_hosts_last = m->etc_hosts_mtime = USEC_INFINITY; |
091a364c | 557 | |
0d2cd476 LP |
558 | r = dns_trust_anchor_load(&m->trust_anchor); |
559 | if (r < 0) | |
560 | return r; | |
561 | ||
ad6c0475 LP |
562 | r = manager_parse_config_file(m); |
563 | if (r < 0) | |
564 | return r; | |
565 | ||
091a364c TG |
566 | r = sd_event_default(&m->event); |
567 | if (r < 0) | |
568 | return r; | |
569 | ||
570 | sd_event_add_signal(m->event, NULL, SIGTERM, NULL, NULL); | |
571 | sd_event_add_signal(m->event, NULL, SIGINT, NULL, NULL); | |
572 | ||
573 | sd_event_set_watchdog(m->event, true); | |
574 | ||
eb60f9cd LP |
575 | r = manager_watch_hostname(m); |
576 | if (r < 0) | |
577 | return r; | |
578 | ||
1716f6dc | 579 | r = dns_scope_new(m, &m->unicast_scope, NULL, DNS_PROTOCOL_DNS, AF_UNSPEC); |
74b2466e LP |
580 | if (r < 0) |
581 | return r; | |
582 | ||
583 | r = manager_network_monitor_listen(m); | |
584 | if (r < 0) | |
585 | return r; | |
586 | ||
587 | r = manager_rtnl_listen(m); | |
588 | if (r < 0) | |
589 | return r; | |
590 | ||
591 | r = manager_connect_bus(m); | |
592 | if (r < 0) | |
593 | return r; | |
594 | ||
4d506d6b | 595 | (void) sd_event_add_signal(m->event, &m->sigusr1_event_source, SIGUSR1, manager_sigusr1, m); |
bc81447e | 596 | (void) sd_event_add_signal(m->event, &m->sigusr2_event_source, SIGUSR2, manager_sigusr2, m); |
4d506d6b | 597 | |
943ef07c LP |
598 | manager_cleanup_saved_user(m); |
599 | ||
091a364c TG |
600 | *ret = m; |
601 | m = NULL; | |
602 | ||
603 | return 0; | |
604 | } | |
605 | ||
edc501d4 LP |
606 | int manager_start(Manager *m) { |
607 | int r; | |
608 | ||
609 | assert(m); | |
610 | ||
b30bf55d LP |
611 | r = manager_dns_stub_start(m); |
612 | if (r < 0) | |
613 | return r; | |
614 | ||
edc501d4 LP |
615 | r = manager_llmnr_start(m); |
616 | if (r < 0) | |
617 | return r; | |
618 | ||
bc7702b0 DM |
619 | r = manager_mdns_start(m); |
620 | if (r < 0) | |
621 | return r; | |
622 | ||
edc501d4 LP |
623 | return 0; |
624 | } | |
625 | ||
74b2466e LP |
626 | Manager *manager_free(Manager *m) { |
627 | Link *l; | |
091a364c TG |
628 | |
629 | if (!m) | |
74b2466e LP |
630 | return NULL; |
631 | ||
4b95f179 LP |
632 | dns_server_unlink_all(m->dns_servers); |
633 | dns_server_unlink_all(m->fallback_dns_servers); | |
a51c1048 LP |
634 | dns_search_domain_unlink_all(m->search_domains); |
635 | ||
74b2466e LP |
636 | while ((l = hashmap_first(m->links))) |
637 | link_free(l); | |
f0e15467 LP |
638 | |
639 | while (m->dns_queries) | |
640 | dns_query_free(m->dns_queries); | |
74b2466e | 641 | |
cab5b059 LP |
642 | dns_scope_free(m->unicast_scope); |
643 | ||
b30bf55d LP |
644 | /* At this point only orphaned streams should remain. All others should have been freed already by their |
645 | * owners */ | |
646 | while (m->dns_streams) | |
647 | dns_stream_unref(m->dns_streams); | |
648 | ||
f0e15467 LP |
649 | hashmap_free(m->links); |
650 | hashmap_free(m->dns_transactions); | |
651 | ||
096b6773 LP |
652 | sd_event_source_unref(m->network_event_source); |
653 | sd_network_monitor_unref(m->network_monitor); | |
091a364c | 654 | |
a564ca2f LP |
655 | sd_netlink_unref(m->rtnl); |
656 | sd_event_source_unref(m->rtnl_event_source); | |
657 | ||
edc501d4 | 658 | manager_llmnr_stop(m); |
bc7702b0 | 659 | manager_mdns_stop(m); |
b30bf55d | 660 | manager_dns_stub_stop(m); |
623a4c97 | 661 | |
902bb5d8 | 662 | sd_bus_slot_unref(m->prepare_for_sleep_slot); |
74b2466e LP |
663 | sd_event_source_unref(m->bus_retry_event_source); |
664 | sd_bus_unref(m->bus); | |
091a364c | 665 | |
4d506d6b | 666 | sd_event_source_unref(m->sigusr1_event_source); |
bc81447e | 667 | sd_event_source_unref(m->sigusr2_event_source); |
4d506d6b | 668 | |
74b2466e | 669 | sd_event_unref(m->event); |
623a4c97 | 670 | |
78c6a153 LP |
671 | dns_resource_key_unref(m->llmnr_host_ipv4_key); |
672 | dns_resource_key_unref(m->llmnr_host_ipv6_key); | |
400cb36e DR |
673 | dns_resource_key_unref(m->mdns_host_ipv4_key); |
674 | dns_resource_key_unref(m->mdns_host_ipv6_key); | |
eb60f9cd | 675 | |
eb60f9cd | 676 | sd_event_source_unref(m->hostname_event_source); |
d9fcf2ba | 677 | safe_close(m->hostname_fd); |
e96de0ce LP |
678 | |
679 | free(m->full_hostname); | |
78c6a153 LP |
680 | free(m->llmnr_hostname); |
681 | free(m->mdns_hostname); | |
eb60f9cd | 682 | |
0d2cd476 | 683 | dns_trust_anchor_flush(&m->trust_anchor); |
dd0bc0f1 | 684 | manager_etc_hosts_flush(m); |
0d2cd476 | 685 | |
6b430fdb | 686 | return mfree(m); |
091a364c TG |
687 | } |
688 | ||
1716f6dc | 689 | int manager_recv(Manager *m, int fd, DnsProtocol protocol, DnsPacket **ret) { |
74b2466e | 690 | _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL; |
1716f6dc LP |
691 | union { |
692 | struct cmsghdr header; /* For alignment */ | |
40a1eebd | 693 | uint8_t buffer[CMSG_SPACE(MAXSIZE(struct in_pktinfo, struct in6_pktinfo)) |
1716f6dc | 694 | + CMSG_SPACE(int) /* ttl/hoplimit */ |
623a4c97 | 695 | + EXTRA_CMSG_SPACE /* kernel appears to require extra buffer space */]; |
1716f6dc LP |
696 | } control; |
697 | union sockaddr_union sa; | |
74b2466e | 698 | struct msghdr mh = {}; |
1716f6dc | 699 | struct cmsghdr *cmsg; |
74b2466e | 700 | struct iovec iov; |
4edc2c9b LP |
701 | ssize_t ms, l; |
702 | int r; | |
74b2466e LP |
703 | |
704 | assert(m); | |
1716f6dc | 705 | assert(fd >= 0); |
74b2466e LP |
706 | assert(ret); |
707 | ||
4edc2c9b | 708 | ms = next_datagram_size_fd(fd); |
74b2466e | 709 | if (ms < 0) |
4edc2c9b | 710 | return ms; |
74b2466e | 711 | |
1716f6dc | 712 | r = dns_packet_new(&p, protocol, ms); |
74b2466e LP |
713 | if (r < 0) |
714 | return r; | |
715 | ||
716 | iov.iov_base = DNS_PACKET_DATA(p); | |
717 | iov.iov_len = p->allocated; | |
718 | ||
1716f6dc LP |
719 | mh.msg_name = &sa.sa; |
720 | mh.msg_namelen = sizeof(sa); | |
74b2466e LP |
721 | mh.msg_iov = &iov; |
722 | mh.msg_iovlen = 1; | |
1716f6dc LP |
723 | mh.msg_control = &control; |
724 | mh.msg_controllen = sizeof(control); | |
74b2466e | 725 | |
a38d9945 | 726 | l = recvmsg(fd, &mh, 0); |
f134289a EV |
727 | if (l == 0) |
728 | return 0; | |
74b2466e | 729 | if (l < 0) { |
ad867662 | 730 | if (errno == EAGAIN || errno == EINTR) |
74b2466e LP |
731 | return 0; |
732 | ||
733 | return -errno; | |
091a364c TG |
734 | } |
735 | ||
1716f6dc LP |
736 | assert(!(mh.msg_flags & MSG_CTRUNC)); |
737 | assert(!(mh.msg_flags & MSG_TRUNC)); | |
738 | ||
74b2466e | 739 | p->size = (size_t) l; |
091a364c | 740 | |
1716f6dc | 741 | p->family = sa.sa.sa_family; |
623a4c97 LP |
742 | p->ipproto = IPPROTO_UDP; |
743 | if (p->family == AF_INET) { | |
1716f6dc | 744 | p->sender.in = sa.in.sin_addr; |
623a4c97 LP |
745 | p->sender_port = be16toh(sa.in.sin_port); |
746 | } else if (p->family == AF_INET6) { | |
1716f6dc | 747 | p->sender.in6 = sa.in6.sin6_addr; |
623a4c97 LP |
748 | p->sender_port = be16toh(sa.in6.sin6_port); |
749 | p->ifindex = sa.in6.sin6_scope_id; | |
750 | } else | |
1716f6dc | 751 | return -EAFNOSUPPORT; |
74b2466e | 752 | |
2a1288ff | 753 | CMSG_FOREACH(cmsg, &mh) { |
74b2466e | 754 | |
1716f6dc LP |
755 | if (cmsg->cmsg_level == IPPROTO_IPV6) { |
756 | assert(p->family == AF_INET6); | |
74b2466e | 757 | |
1716f6dc | 758 | switch (cmsg->cmsg_type) { |
74b2466e | 759 | |
1716f6dc LP |
760 | case IPV6_PKTINFO: { |
761 | struct in6_pktinfo *i = (struct in6_pktinfo*) CMSG_DATA(cmsg); | |
74b2466e | 762 | |
623a4c97 LP |
763 | if (p->ifindex <= 0) |
764 | p->ifindex = i->ipi6_ifindex; | |
765 | ||
1716f6dc LP |
766 | p->destination.in6 = i->ipi6_addr; |
767 | break; | |
768 | } | |
74b2466e | 769 | |
1716f6dc LP |
770 | case IPV6_HOPLIMIT: |
771 | p->ttl = *(int *) CMSG_DATA(cmsg); | |
772 | break; | |
74b2466e | 773 | |
1716f6dc LP |
774 | } |
775 | } else if (cmsg->cmsg_level == IPPROTO_IP) { | |
776 | assert(p->family == AF_INET); | |
74b2466e | 777 | |
1716f6dc | 778 | switch (cmsg->cmsg_type) { |
74b2466e | 779 | |
1716f6dc LP |
780 | case IP_PKTINFO: { |
781 | struct in_pktinfo *i = (struct in_pktinfo*) CMSG_DATA(cmsg); | |
091a364c | 782 | |
623a4c97 LP |
783 | if (p->ifindex <= 0) |
784 | p->ifindex = i->ipi_ifindex; | |
785 | ||
1716f6dc LP |
786 | p->destination.in = i->ipi_addr; |
787 | break; | |
788 | } | |
74b2466e | 789 | |
623a4c97 | 790 | case IP_TTL: |
1716f6dc LP |
791 | p->ttl = *(int *) CMSG_DATA(cmsg); |
792 | break; | |
793 | } | |
794 | } | |
795 | } | |
74b2466e | 796 | |
623a4c97 LP |
797 | /* The Linux kernel sets the interface index to the loopback |
798 | * device if the packet came from the local host since it | |
799 | * avoids the routing table in such a case. Let's unset the | |
800 | * interface index in such a case. */ | |
a5f03596 | 801 | if (p->ifindex == LOOPBACK_IFINDEX) |
623a4c97 LP |
802 | p->ifindex = 0; |
803 | ||
86ad4cd7 TG |
804 | if (protocol != DNS_PROTOCOL_DNS) { |
805 | /* If we don't know the interface index still, we look for the | |
806 | * first local interface with a matching address. Yuck! */ | |
807 | if (p->ifindex <= 0) | |
808 | p->ifindex = manager_find_ifindex(m, p->family, &p->destination); | |
809 | } | |
623a4c97 | 810 | |
74b2466e LP |
811 | *ret = p; |
812 | p = NULL; | |
813 | ||
814 | return 1; | |
815 | } | |
816 | ||
74b2466e LP |
817 | static int sendmsg_loop(int fd, struct msghdr *mh, int flags) { |
818 | int r; | |
819 | ||
820 | assert(fd >= 0); | |
821 | assert(mh); | |
822 | ||
823 | for (;;) { | |
824 | if (sendmsg(fd, mh, flags) >= 0) | |
825 | return 0; | |
826 | ||
827 | if (errno == EINTR) | |
828 | continue; | |
829 | ||
830 | if (errno != EAGAIN) | |
831 | return -errno; | |
832 | ||
833 | r = fd_wait_for_event(fd, POLLOUT, SEND_TIMEOUT_USEC); | |
834 | if (r < 0) | |
835 | return r; | |
836 | if (r == 0) | |
837 | return -ETIMEDOUT; | |
838 | } | |
839 | } | |
840 | ||
72290734 TG |
841 | static int write_loop(int fd, void *message, size_t length) { |
842 | int r; | |
843 | ||
844 | assert(fd >= 0); | |
845 | assert(message); | |
846 | ||
847 | for (;;) { | |
848 | if (write(fd, message, length) >= 0) | |
849 | return 0; | |
850 | ||
851 | if (errno == EINTR) | |
852 | continue; | |
853 | ||
854 | if (errno != EAGAIN) | |
855 | return -errno; | |
856 | ||
857 | r = fd_wait_for_event(fd, POLLOUT, SEND_TIMEOUT_USEC); | |
858 | if (r < 0) | |
859 | return r; | |
860 | if (r == 0) | |
861 | return -ETIMEDOUT; | |
862 | } | |
863 | } | |
864 | ||
865 | int manager_write(Manager *m, int fd, DnsPacket *p) { | |
866 | int r; | |
867 | ||
deb3f3d3 | 868 | log_debug("Sending %s packet with id %" PRIu16 ".", DNS_PACKET_QR(p) ? "response" : "query", DNS_PACKET_ID(p)); |
72290734 TG |
869 | |
870 | r = write_loop(fd, DNS_PACKET_DATA(p), p->size); | |
871 | if (r < 0) | |
872 | return r; | |
873 | ||
874 | return 0; | |
875 | } | |
876 | ||
b30bf55d LP |
877 | static int manager_ipv4_send( |
878 | Manager *m, | |
879 | int fd, | |
880 | int ifindex, | |
881 | const struct in_addr *destination, | |
882 | uint16_t port, | |
883 | const struct in_addr *source, | |
884 | DnsPacket *p) { | |
74b2466e LP |
885 | union sockaddr_union sa = { |
886 | .in.sin_family = AF_INET, | |
74b2466e | 887 | }; |
1716f6dc LP |
888 | union { |
889 | struct cmsghdr header; /* For alignment */ | |
890 | uint8_t buffer[CMSG_SPACE(sizeof(struct in_pktinfo))]; | |
891 | } control; | |
74b2466e LP |
892 | struct msghdr mh = {}; |
893 | struct iovec iov; | |
74b2466e LP |
894 | |
895 | assert(m); | |
1716f6dc | 896 | assert(fd >= 0); |
b30bf55d | 897 | assert(destination); |
1716f6dc | 898 | assert(port > 0); |
74b2466e LP |
899 | assert(p); |
900 | ||
74b2466e LP |
901 | iov.iov_base = DNS_PACKET_DATA(p); |
902 | iov.iov_len = p->size; | |
091a364c | 903 | |
b30bf55d | 904 | sa.in.sin_addr = *destination; |
1716f6dc | 905 | sa.in.sin_port = htobe16(port), |
091a364c | 906 | |
74b2466e LP |
907 | mh.msg_iov = &iov; |
908 | mh.msg_iovlen = 1; | |
909 | mh.msg_name = &sa.sa; | |
910 | mh.msg_namelen = sizeof(sa.in); | |
091a364c | 911 | |
74b2466e LP |
912 | if (ifindex > 0) { |
913 | struct cmsghdr *cmsg; | |
914 | struct in_pktinfo *pi; | |
915 | ||
916 | zero(control); | |
917 | ||
1716f6dc | 918 | mh.msg_control = &control; |
74b2466e LP |
919 | mh.msg_controllen = CMSG_LEN(sizeof(struct in_pktinfo)); |
920 | ||
921 | cmsg = CMSG_FIRSTHDR(&mh); | |
922 | cmsg->cmsg_len = mh.msg_controllen; | |
923 | cmsg->cmsg_level = IPPROTO_IP; | |
924 | cmsg->cmsg_type = IP_PKTINFO; | |
925 | ||
926 | pi = (struct in_pktinfo*) CMSG_DATA(cmsg); | |
927 | pi->ipi_ifindex = ifindex; | |
b30bf55d LP |
928 | |
929 | if (source) | |
930 | pi->ipi_spec_dst = *source; | |
74b2466e LP |
931 | } |
932 | ||
933 | return sendmsg_loop(fd, &mh, 0); | |
934 | } | |
935 | ||
b30bf55d LP |
936 | static int manager_ipv6_send( |
937 | Manager *m, | |
938 | int fd, | |
939 | int ifindex, | |
940 | const struct in6_addr *destination, | |
941 | uint16_t port, | |
942 | const struct in6_addr *source, | |
943 | DnsPacket *p) { | |
944 | ||
74b2466e LP |
945 | union sockaddr_union sa = { |
946 | .in6.sin6_family = AF_INET6, | |
74b2466e | 947 | }; |
1716f6dc LP |
948 | union { |
949 | struct cmsghdr header; /* For alignment */ | |
950 | uint8_t buffer[CMSG_SPACE(sizeof(struct in6_pktinfo))]; | |
951 | } control; | |
74b2466e LP |
952 | struct msghdr mh = {}; |
953 | struct iovec iov; | |
74b2466e LP |
954 | |
955 | assert(m); | |
1716f6dc | 956 | assert(fd >= 0); |
b30bf55d | 957 | assert(destination); |
1716f6dc | 958 | assert(port > 0); |
74b2466e LP |
959 | assert(p); |
960 | ||
74b2466e LP |
961 | iov.iov_base = DNS_PACKET_DATA(p); |
962 | iov.iov_len = p->size; | |
963 | ||
b30bf55d | 964 | sa.in6.sin6_addr = *destination; |
1716f6dc | 965 | sa.in6.sin6_port = htobe16(port), |
74b2466e LP |
966 | sa.in6.sin6_scope_id = ifindex; |
967 | ||
968 | mh.msg_iov = &iov; | |
969 | mh.msg_iovlen = 1; | |
970 | mh.msg_name = &sa.sa; | |
971 | mh.msg_namelen = sizeof(sa.in6); | |
972 | ||
973 | if (ifindex > 0) { | |
974 | struct cmsghdr *cmsg; | |
975 | struct in6_pktinfo *pi; | |
976 | ||
977 | zero(control); | |
978 | ||
1716f6dc | 979 | mh.msg_control = &control; |
74b2466e LP |
980 | mh.msg_controllen = CMSG_LEN(sizeof(struct in6_pktinfo)); |
981 | ||
982 | cmsg = CMSG_FIRSTHDR(&mh); | |
983 | cmsg->cmsg_len = mh.msg_controllen; | |
984 | cmsg->cmsg_level = IPPROTO_IPV6; | |
985 | cmsg->cmsg_type = IPV6_PKTINFO; | |
986 | ||
987 | pi = (struct in6_pktinfo*) CMSG_DATA(cmsg); | |
988 | pi->ipi6_ifindex = ifindex; | |
b30bf55d LP |
989 | |
990 | if (source) | |
991 | pi->ipi6_addr = *source; | |
74b2466e LP |
992 | } |
993 | ||
994 | return sendmsg_loop(fd, &mh, 0); | |
995 | } | |
996 | ||
b30bf55d LP |
997 | int manager_send( |
998 | Manager *m, | |
999 | int fd, | |
1000 | int ifindex, | |
1001 | int family, | |
1002 | const union in_addr_union *destination, | |
1003 | uint16_t port, | |
1004 | const union in_addr_union *source, | |
1005 | DnsPacket *p) { | |
1006 | ||
1716f6dc LP |
1007 | assert(m); |
1008 | assert(fd >= 0); | |
b30bf55d | 1009 | assert(destination); |
1716f6dc LP |
1010 | assert(port > 0); |
1011 | assert(p); | |
1012 | ||
deb3f3d3 | 1013 | log_debug("Sending %s packet with id %" PRIu16 " on interface %i/%s.", DNS_PACKET_QR(p) ? "response" : "query", DNS_PACKET_ID(p), ifindex, af_to_name(family)); |
a2a416f7 | 1014 | |
1716f6dc | 1015 | if (family == AF_INET) |
b30bf55d | 1016 | return manager_ipv4_send(m, fd, ifindex, &destination->in, port, &source->in, p); |
2817157b | 1017 | if (family == AF_INET6) |
b30bf55d | 1018 | return manager_ipv6_send(m, fd, ifindex, &destination->in6, port, &source->in6, p); |
1716f6dc LP |
1019 | |
1020 | return -EAFNOSUPPORT; | |
1021 | } | |
1022 | ||
e1c95994 LP |
1023 | uint32_t manager_find_mtu(Manager *m) { |
1024 | uint32_t mtu = 0; | |
1025 | Link *l; | |
1026 | Iterator i; | |
1027 | ||
1028 | /* If we don't know on which link a DNS packet would be | |
1029 | * delivered, let's find the largest MTU that works on all | |
1030 | * interfaces we know of */ | |
1031 | ||
1032 | HASHMAP_FOREACH(l, m->links, i) { | |
1033 | if (l->mtu <= 0) | |
1034 | continue; | |
1035 | ||
1036 | if (mtu <= 0 || l->mtu < mtu) | |
1037 | mtu = l->mtu; | |
1038 | } | |
1039 | ||
1040 | return mtu; | |
1041 | } | |
1716f6dc | 1042 | |
623a4c97 | 1043 | int manager_find_ifindex(Manager *m, int family, const union in_addr_union *in_addr) { |
ec2c5e43 LP |
1044 | LinkAddress *a; |
1045 | ||
1046 | assert(m); | |
1047 | ||
4e945a6f | 1048 | a = manager_find_link_address(m, family, in_addr); |
ec2c5e43 LP |
1049 | if (a) |
1050 | return a->link->ifindex; | |
1051 | ||
1052 | return 0; | |
1053 | } | |
1054 | ||
eb60f9cd LP |
1055 | void manager_refresh_rrs(Manager *m) { |
1056 | Iterator i; | |
1057 | Link *l; | |
1058 | ||
1059 | assert(m); | |
1060 | ||
78c6a153 LP |
1061 | m->llmnr_host_ipv4_key = dns_resource_key_unref(m->llmnr_host_ipv4_key); |
1062 | m->llmnr_host_ipv6_key = dns_resource_key_unref(m->llmnr_host_ipv6_key); | |
400cb36e DR |
1063 | m->mdns_host_ipv4_key = dns_resource_key_unref(m->mdns_host_ipv4_key); |
1064 | m->mdns_host_ipv6_key = dns_resource_key_unref(m->mdns_host_ipv6_key); | |
eb60f9cd LP |
1065 | |
1066 | HASHMAP_FOREACH(l, m->links, i) { | |
1067 | link_add_rrs(l, true); | |
1068 | link_add_rrs(l, false); | |
1069 | } | |
1070 | } | |
1071 | ||
ec2c5e43 LP |
1072 | int manager_next_hostname(Manager *m) { |
1073 | const char *p; | |
556a2294 | 1074 | uint64_t u, a; |
78c6a153 LP |
1075 | char *h, *k; |
1076 | int r; | |
623a4c97 LP |
1077 | |
1078 | assert(m); | |
1079 | ||
78c6a153 | 1080 | p = strchr(m->llmnr_hostname, 0); |
ec2c5e43 LP |
1081 | assert(p); |
1082 | ||
78c6a153 | 1083 | while (p > m->llmnr_hostname) { |
ec2c5e43 LP |
1084 | if (!strchr("0123456789", p[-1])) |
1085 | break; | |
1086 | ||
1087 | p--; | |
1088 | } | |
1089 | ||
1090 | if (*p == 0 || safe_atou64(p, &u) < 0 || u <= 0) | |
1091 | u = 1; | |
1092 | ||
556a2294 LP |
1093 | /* Add a random number to the old value. This way we can avoid |
1094 | * that two hosts pick the same hostname, win on IPv4 and lose | |
1095 | * on IPv6 (or vice versa), and pick the same hostname | |
1096 | * replacement hostname, ad infinitum. We still want the | |
1097 | * numbers to go up monotonically, hence we just add a random | |
1098 | * value 1..10 */ | |
1099 | ||
1100 | random_bytes(&a, sizeof(a)); | |
1101 | u += 1 + a % 10; | |
ec2c5e43 | 1102 | |
78c6a153 | 1103 | if (asprintf(&h, "%.*s%" PRIu64, (int) (p - m->llmnr_hostname), m->llmnr_hostname, u) < 0) |
ec2c5e43 LP |
1104 | return -ENOMEM; |
1105 | ||
78c6a153 LP |
1106 | r = dns_name_concat(h, "local", &k); |
1107 | if (r < 0) { | |
1108 | free(h); | |
1109 | return r; | |
1110 | } | |
1111 | ||
1112 | log_info("Hostname conflict, changing published hostname from '%s' to '%s'.", m->llmnr_hostname, h); | |
1113 | ||
1114 | free(m->llmnr_hostname); | |
1115 | m->llmnr_hostname = h; | |
ec2c5e43 | 1116 | |
78c6a153 LP |
1117 | free(m->mdns_hostname); |
1118 | m->mdns_hostname = k; | |
ec2c5e43 | 1119 | |
eb60f9cd | 1120 | manager_refresh_rrs(m); |
623a4c97 LP |
1121 | |
1122 | return 0; | |
1123 | } | |
ec2c5e43 | 1124 | |
4e945a6f | 1125 | LinkAddress* manager_find_link_address(Manager *m, int family, const union in_addr_union *in_addr) { |
ec2c5e43 LP |
1126 | Iterator i; |
1127 | Link *l; | |
1128 | ||
1129 | assert(m); | |
1130 | ||
1131 | HASHMAP_FOREACH(l, m->links, i) { | |
1132 | LinkAddress *a; | |
1133 | ||
1134 | a = link_find_address(l, family, in_addr); | |
1135 | if (a) | |
1136 | return a; | |
1137 | } | |
1138 | ||
1139 | return NULL; | |
1140 | } | |
1141 | ||
a4076574 | 1142 | bool manager_our_packet(Manager *m, DnsPacket *p) { |
ec2c5e43 LP |
1143 | assert(m); |
1144 | assert(p); | |
1145 | ||
4e945a6f | 1146 | return !!manager_find_link_address(m, p->family, &p->sender); |
ec2c5e43 | 1147 | } |
4e945a6f | 1148 | |
a4076574 LP |
1149 | DnsScope* manager_find_scope(Manager *m, DnsPacket *p) { |
1150 | Link *l; | |
1151 | ||
1152 | assert(m); | |
1153 | assert(p); | |
1154 | ||
1155 | l = hashmap_get(m->links, INT_TO_PTR(p->ifindex)); | |
1156 | if (!l) | |
1157 | return NULL; | |
1158 | ||
b4f1862d DM |
1159 | switch (p->protocol) { |
1160 | case DNS_PROTOCOL_LLMNR: | |
a4076574 LP |
1161 | if (p->family == AF_INET) |
1162 | return l->llmnr_ipv4_scope; | |
1163 | else if (p->family == AF_INET6) | |
1164 | return l->llmnr_ipv6_scope; | |
b4f1862d DM |
1165 | |
1166 | break; | |
1167 | ||
1168 | case DNS_PROTOCOL_MDNS: | |
1169 | if (p->family == AF_INET) | |
1170 | return l->mdns_ipv4_scope; | |
1171 | else if (p->family == AF_INET6) | |
1172 | return l->mdns_ipv6_scope; | |
1173 | ||
1174 | break; | |
1175 | ||
1176 | default: | |
1177 | break; | |
a4076574 LP |
1178 | } |
1179 | ||
1180 | return NULL; | |
1181 | } | |
1182 | ||
902bb5d8 LP |
1183 | void manager_verify_all(Manager *m) { |
1184 | DnsScope *s; | |
1185 | ||
1186 | assert(m); | |
1187 | ||
1188 | LIST_FOREACH(scopes, s, m->dns_scopes) | |
1189 | dns_zone_verify_all(&s->zone); | |
1190 | } | |
1191 | ||
78c6a153 | 1192 | int manager_is_own_hostname(Manager *m, const char *name) { |
78c6a153 LP |
1193 | int r; |
1194 | ||
1195 | assert(m); | |
1196 | assert(name); | |
1197 | ||
1198 | if (m->llmnr_hostname) { | |
1199 | r = dns_name_equal(name, m->llmnr_hostname); | |
1200 | if (r != 0) | |
1201 | return r; | |
1202 | } | |
1203 | ||
e96de0ce LP |
1204 | if (m->mdns_hostname) { |
1205 | r = dns_name_equal(name, m->mdns_hostname); | |
1206 | if (r != 0) | |
1207 | return r; | |
1208 | } | |
1209 | ||
1210 | if (m->full_hostname) | |
1211 | return dns_name_equal(name, m->full_hostname); | |
78c6a153 LP |
1212 | |
1213 | return 0; | |
1214 | } | |
1215 | ||
9176a57c LP |
1216 | int manager_compile_dns_servers(Manager *m, OrderedSet **dns) { |
1217 | DnsServer *s; | |
1218 | Iterator i; | |
1219 | Link *l; | |
1220 | int r; | |
1221 | ||
1222 | assert(m); | |
1223 | assert(dns); | |
1224 | ||
1225 | r = ordered_set_ensure_allocated(dns, &dns_server_hash_ops); | |
1226 | if (r < 0) | |
1227 | return r; | |
1228 | ||
1229 | /* First add the system-wide servers and domains */ | |
1230 | LIST_FOREACH(servers, s, m->dns_servers) { | |
1231 | r = ordered_set_put(*dns, s); | |
1232 | if (r == -EEXIST) | |
1233 | continue; | |
1234 | if (r < 0) | |
1235 | return r; | |
1236 | } | |
1237 | ||
1238 | /* Then, add the per-link servers */ | |
1239 | HASHMAP_FOREACH(l, m->links, i) { | |
1240 | LIST_FOREACH(servers, s, l->dns_servers) { | |
1241 | r = ordered_set_put(*dns, s); | |
1242 | if (r == -EEXIST) | |
1243 | continue; | |
1244 | if (r < 0) | |
1245 | return r; | |
1246 | } | |
1247 | } | |
1248 | ||
1249 | /* If we found nothing, add the fallback servers */ | |
1250 | if (ordered_set_isempty(*dns)) { | |
1251 | LIST_FOREACH(servers, s, m->fallback_dns_servers) { | |
1252 | r = ordered_set_put(*dns, s); | |
1253 | if (r == -EEXIST) | |
1254 | continue; | |
1255 | if (r < 0) | |
1256 | return r; | |
1257 | } | |
1258 | } | |
1259 | ||
1260 | return 0; | |
1261 | } | |
1262 | ||
94363cbb MP |
1263 | /* filter_route is a tri-state: |
1264 | * < 0: no filtering | |
1265 | * = 0 or false: return only domains which should be used for searching | |
1266 | * > 0 or true: return only domains which are for routing only | |
1267 | */ | |
6f7da49d | 1268 | int manager_compile_search_domains(Manager *m, OrderedSet **domains, int filter_route) { |
9176a57c LP |
1269 | DnsSearchDomain *d; |
1270 | Iterator i; | |
1271 | Link *l; | |
1272 | int r; | |
1273 | ||
1274 | assert(m); | |
1275 | assert(domains); | |
1276 | ||
1277 | r = ordered_set_ensure_allocated(domains, &dns_name_hash_ops); | |
1278 | if (r < 0) | |
1279 | return r; | |
1280 | ||
1281 | LIST_FOREACH(domains, d, m->search_domains) { | |
6f7da49d LP |
1282 | |
1283 | if (filter_route >= 0 && | |
1284 | d->route_only != !!filter_route) | |
1285 | continue; | |
1286 | ||
9176a57c LP |
1287 | r = ordered_set_put(*domains, d->name); |
1288 | if (r == -EEXIST) | |
1289 | continue; | |
1290 | if (r < 0) | |
1291 | return r; | |
1292 | } | |
1293 | ||
1294 | HASHMAP_FOREACH(l, m->links, i) { | |
1295 | ||
1296 | LIST_FOREACH(domains, d, l->search_domains) { | |
6f7da49d LP |
1297 | |
1298 | if (filter_route >= 0 && | |
1299 | d->route_only != !!filter_route) | |
1300 | continue; | |
1301 | ||
9176a57c LP |
1302 | r = ordered_set_put(*domains, d->name); |
1303 | if (r == -EEXIST) | |
1304 | continue; | |
1305 | if (r < 0) | |
1306 | return r; | |
1307 | } | |
1308 | } | |
1309 | ||
1310 | return 0; | |
1311 | } | |
c69fa7e3 LP |
1312 | |
1313 | DnssecMode manager_get_dnssec_mode(Manager *m) { | |
1314 | assert(m); | |
1315 | ||
1316 | if (m->dnssec_mode != _DNSSEC_MODE_INVALID) | |
1317 | return m->dnssec_mode; | |
1318 | ||
1319 | return DNSSEC_NO; | |
1320 | } | |
1321 | ||
1322 | bool manager_dnssec_supported(Manager *m) { | |
1323 | DnsServer *server; | |
1324 | Iterator i; | |
1325 | Link *l; | |
1326 | ||
1327 | assert(m); | |
1328 | ||
1329 | if (manager_get_dnssec_mode(m) == DNSSEC_NO) | |
1330 | return false; | |
1331 | ||
1332 | server = manager_get_dns_server(m); | |
1333 | if (server && !dns_server_dnssec_supported(server)) | |
1334 | return false; | |
1335 | ||
1336 | HASHMAP_FOREACH(l, m->links, i) | |
1337 | if (!link_dnssec_supported(l)) | |
1338 | return false; | |
1339 | ||
1340 | return true; | |
1341 | } | |
59c5b597 LP |
1342 | |
1343 | void manager_dnssec_verdict(Manager *m, DnssecVerdict verdict, const DnsResourceKey *key) { | |
1344 | ||
1345 | assert(verdict >= 0); | |
1346 | assert(verdict < _DNSSEC_VERDICT_MAX); | |
1347 | ||
1348 | if (log_get_max_level() >= LOG_DEBUG) { | |
202b76ae | 1349 | char s[DNS_RESOURCE_KEY_STRING_MAX]; |
59c5b597 | 1350 | |
202b76ae ZJS |
1351 | log_debug("Found verdict for lookup %s: %s", |
1352 | dns_resource_key_to_string(key, s, sizeof s), | |
1353 | dnssec_verdict_to_string(verdict)); | |
59c5b597 LP |
1354 | } |
1355 | ||
1356 | m->n_dnssec_verdict[verdict]++; | |
1357 | } | |
011696f7 LP |
1358 | |
1359 | bool manager_routable(Manager *m, int family) { | |
1360 | Iterator i; | |
1361 | Link *l; | |
1362 | ||
1363 | assert(m); | |
1364 | ||
1365 | /* Returns true if the host has at least one interface with a routable address of the specified type */ | |
1366 | ||
1367 | HASHMAP_FOREACH(l, m->links, i) | |
1368 | if (link_relevant(l, family, false)) | |
1369 | return true; | |
1370 | ||
1371 | return false; | |
1372 | } | |
ba35662f LP |
1373 | |
1374 | void manager_flush_caches(Manager *m) { | |
1375 | DnsScope *scope; | |
1376 | ||
1377 | assert(m); | |
1378 | ||
1379 | LIST_FOREACH(scopes, scope, m->dns_scopes) | |
1380 | dns_cache_flush(&scope->cache); | |
aac57b35 ZJS |
1381 | |
1382 | log_info("Flushed all caches."); | |
ba35662f | 1383 | } |
943ef07c LP |
1384 | |
1385 | void manager_cleanup_saved_user(Manager *m) { | |
1386 | _cleanup_closedir_ DIR *d = NULL; | |
1387 | struct dirent *de; | |
1388 | int r; | |
1389 | ||
1390 | assert(m); | |
1391 | ||
1392 | /* Clean up all saved per-link files in /run/systemd/resolve/netif/ that don't have a matching interface | |
1393 | * anymore. These files are created to persist settings pushed in by the user via the bus, so that resolved can | |
1394 | * be restarted without losing this data. */ | |
1395 | ||
1396 | d = opendir("/run/systemd/resolve/netif/"); | |
1397 | if (!d) { | |
1398 | if (errno == ENOENT) | |
1399 | return; | |
1400 | ||
1401 | log_warning_errno(errno, "Failed to open interface directory: %m"); | |
1402 | return; | |
1403 | } | |
1404 | ||
1405 | FOREACH_DIRENT_ALL(de, d, log_error_errno(errno, "Failed to read interface directory: %m")) { | |
1406 | _cleanup_free_ char *p = NULL; | |
1407 | int ifindex; | |
1408 | Link *l; | |
1409 | ||
1410 | if (!IN_SET(de->d_type, DT_UNKNOWN, DT_REG)) | |
1411 | continue; | |
1412 | ||
49bfc877 | 1413 | if (dot_or_dot_dot(de->d_name)) |
943ef07c LP |
1414 | continue; |
1415 | ||
1416 | r = parse_ifindex(de->d_name, &ifindex); | |
1417 | if (r < 0) /* Probably some temporary file from a previous run. Delete it */ | |
1418 | goto rm; | |
1419 | ||
1420 | l = hashmap_get(m->links, INT_TO_PTR(ifindex)); | |
1421 | if (!l) /* link vanished */ | |
1422 | goto rm; | |
1423 | ||
1424 | if (l->is_managed) /* now managed by networkd, hence the bus settings are useless */ | |
1425 | goto rm; | |
1426 | ||
1427 | continue; | |
1428 | ||
1429 | rm: | |
1430 | p = strappend("/run/systemd/resolve/netif/", de->d_name); | |
1431 | if (!p) { | |
1432 | log_oom(); | |
1433 | return; | |
1434 | } | |
1435 | ||
1436 | (void) unlink(p); | |
1437 | } | |
1438 | } |