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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
091a364c TG |
2 | /*** |
3 | This file is part of systemd. | |
4 | ||
5 | Copyright 2014 Tom Gundersen <teg@jklm.no> | |
6 | ||
7 | systemd is free software; you can redistribute it and/or modify it | |
8 | under the terms of the GNU Lesser General Public License as published by | |
9 | the Free Software Foundation; either version 2.1 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | systemd is distributed in the hope that it will be useful, but | |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | Lesser General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU Lesser General Public License | |
18 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
19 | ***/ | |
20 | ||
07630cea LP |
21 | #include <netinet/in.h> |
22 | #include <poll.h> | |
74b2466e | 23 | #include <sys/ioctl.h> |
091a364c | 24 | |
349cc4a5 | 25 | #if HAVE_LIBIDN2 |
87057e24 ZJS |
26 | #include <idn2.h> |
27 | #endif | |
28 | ||
a2a416f7 | 29 | #include "af-list.h" |
b5efdb8a | 30 | #include "alloc-util.h" |
943ef07c | 31 | #include "dirent-util.h" |
07630cea | 32 | #include "dns-domain.h" |
3ffd4af2 | 33 | #include "fd-util.h" |
a5a807e6 | 34 | #include "fileio-label.h" |
07630cea | 35 | #include "hostname-util.h" |
c004493c | 36 | #include "io-util.h" |
07630cea LP |
37 | #include "netlink-util.h" |
38 | #include "network-internal.h" | |
822db23c | 39 | #include "ordered-set.h" |
6bedfcbb | 40 | #include "parse-util.h" |
3df3e884 | 41 | #include "random-util.h" |
39d8db04 | 42 | #include "resolved-bus.h" |
07630cea | 43 | #include "resolved-conf.h" |
b30bf55d | 44 | #include "resolved-dns-stub.h" |
dd0bc0f1 | 45 | #include "resolved-etc-hosts.h" |
5f402ae8 | 46 | #include "resolved-llmnr.h" |
07630cea | 47 | #include "resolved-manager.h" |
bc7702b0 | 48 | #include "resolved-mdns.h" |
dd0bc0f1 | 49 | #include "resolved-resolv-conf.h" |
07630cea | 50 | #include "socket-util.h" |
8b43440b | 51 | #include "string-table.h" |
07630cea LP |
52 | #include "string-util.h" |
53 | #include "utf8.h" | |
74b2466e LP |
54 | |
55 | #define SEND_TIMEOUT_USEC (200 * USEC_PER_MSEC) | |
56 | ||
1c4baffc | 57 | static int manager_process_link(sd_netlink *rtnl, sd_netlink_message *mm, void *userdata) { |
74b2466e LP |
58 | Manager *m = userdata; |
59 | uint16_t type; | |
60 | Link *l; | |
61 | int ifindex, r; | |
62 | ||
63 | assert(rtnl); | |
64 | assert(m); | |
65 | assert(mm); | |
66 | ||
1c4baffc | 67 | r = sd_netlink_message_get_type(mm, &type); |
74b2466e LP |
68 | if (r < 0) |
69 | goto fail; | |
70 | ||
71 | r = sd_rtnl_message_link_get_ifindex(mm, &ifindex); | |
72 | if (r < 0) | |
73 | goto fail; | |
74 | ||
75 | l = hashmap_get(m->links, INT_TO_PTR(ifindex)); | |
76 | ||
77 | switch (type) { | |
78 | ||
a2a416f7 LP |
79 | case RTM_NEWLINK:{ |
80 | bool is_new = !l; | |
74b2466e | 81 | |
a2a416f7 | 82 | if (!l) { |
74b2466e LP |
83 | r = link_new(m, &l, ifindex); |
84 | if (r < 0) | |
85 | goto fail; | |
86 | } | |
87 | ||
943ef07c | 88 | r = link_process_rtnl(l, mm); |
74b2466e LP |
89 | if (r < 0) |
90 | goto fail; | |
91 | ||
943ef07c | 92 | r = link_update(l); |
21d73c87 LP |
93 | if (r < 0) |
94 | goto fail; | |
95 | ||
a2a416f7 LP |
96 | if (is_new) |
97 | log_debug("Found new link %i/%s", ifindex, l->name); | |
98 | ||
74b2466e | 99 | break; |
a2a416f7 | 100 | } |
74b2466e LP |
101 | |
102 | case RTM_DELLINK: | |
103 | if (l) { | |
a2a416f7 | 104 | log_debug("Removing link %i/%s", l->ifindex, l->name); |
943ef07c | 105 | link_remove_user(l); |
74b2466e LP |
106 | link_free(l); |
107 | } | |
108 | ||
109 | break; | |
110 | } | |
111 | ||
112 | return 0; | |
113 | ||
114 | fail: | |
da927ba9 | 115 | log_warning_errno(r, "Failed to process RTNL link message: %m"); |
74b2466e LP |
116 | return 0; |
117 | } | |
118 | ||
1c4baffc | 119 | static int manager_process_address(sd_netlink *rtnl, sd_netlink_message *mm, void *userdata) { |
74b2466e LP |
120 | Manager *m = userdata; |
121 | union in_addr_union address; | |
74b2466e | 122 | uint16_t type; |
0dd25fb9 | 123 | int r, ifindex, family; |
74b2466e LP |
124 | LinkAddress *a; |
125 | Link *l; | |
126 | ||
127 | assert(rtnl); | |
128 | assert(mm); | |
129 | assert(m); | |
130 | ||
1c4baffc | 131 | r = sd_netlink_message_get_type(mm, &type); |
74b2466e LP |
132 | if (r < 0) |
133 | goto fail; | |
134 | ||
135 | r = sd_rtnl_message_addr_get_ifindex(mm, &ifindex); | |
136 | if (r < 0) | |
137 | goto fail; | |
138 | ||
139 | l = hashmap_get(m->links, INT_TO_PTR(ifindex)); | |
140 | if (!l) | |
141 | return 0; | |
142 | ||
143 | r = sd_rtnl_message_addr_get_family(mm, &family); | |
144 | if (r < 0) | |
145 | goto fail; | |
146 | ||
147 | switch (family) { | |
148 | ||
149 | case AF_INET: | |
1c4baffc | 150 | r = sd_netlink_message_read_in_addr(mm, IFA_LOCAL, &address.in); |
74b2466e | 151 | if (r < 0) { |
1c4baffc | 152 | r = sd_netlink_message_read_in_addr(mm, IFA_ADDRESS, &address.in); |
74b2466e LP |
153 | if (r < 0) |
154 | goto fail; | |
155 | } | |
156 | ||
157 | break; | |
158 | ||
159 | case AF_INET6: | |
1c4baffc | 160 | r = sd_netlink_message_read_in6_addr(mm, IFA_LOCAL, &address.in6); |
74b2466e | 161 | if (r < 0) { |
1c4baffc | 162 | r = sd_netlink_message_read_in6_addr(mm, IFA_ADDRESS, &address.in6); |
74b2466e LP |
163 | if (r < 0) |
164 | goto fail; | |
165 | } | |
166 | ||
167 | break; | |
168 | ||
169 | default: | |
170 | return 0; | |
171 | } | |
172 | ||
173 | a = link_find_address(l, family, &address); | |
174 | ||
175 | switch (type) { | |
176 | ||
177 | case RTM_NEWADDR: | |
178 | ||
179 | if (!a) { | |
180 | r = link_address_new(l, &a, family, &address); | |
181 | if (r < 0) | |
182 | return r; | |
183 | } | |
184 | ||
185 | r = link_address_update_rtnl(a, mm); | |
186 | if (r < 0) | |
187 | return r; | |
188 | ||
189 | break; | |
190 | ||
191 | case RTM_DELADDR: | |
3e044c49 | 192 | link_address_free(a); |
74b2466e LP |
193 | break; |
194 | } | |
195 | ||
196 | return 0; | |
197 | ||
198 | fail: | |
da927ba9 | 199 | log_warning_errno(r, "Failed to process RTNL address message: %m"); |
74b2466e LP |
200 | return 0; |
201 | } | |
202 | ||
74b2466e | 203 | static int manager_rtnl_listen(Manager *m) { |
4afd3348 | 204 | _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL; |
1c4baffc | 205 | sd_netlink_message *i; |
74b2466e LP |
206 | int r; |
207 | ||
208 | assert(m); | |
209 | ||
cc98b302 | 210 | /* First, subscribe to interfaces coming and going */ |
1c4baffc | 211 | r = sd_netlink_open(&m->rtnl); |
74b2466e LP |
212 | if (r < 0) |
213 | return r; | |
214 | ||
2d895038 | 215 | r = sd_netlink_attach_event(m->rtnl, m->event, SD_EVENT_PRIORITY_IMPORTANT); |
74b2466e LP |
216 | if (r < 0) |
217 | return r; | |
218 | ||
1c4baffc | 219 | r = sd_netlink_add_match(m->rtnl, RTM_NEWLINK, manager_process_link, m); |
74b2466e LP |
220 | if (r < 0) |
221 | return r; | |
222 | ||
1c4baffc | 223 | r = sd_netlink_add_match(m->rtnl, RTM_DELLINK, manager_process_link, m); |
74b2466e LP |
224 | if (r < 0) |
225 | return r; | |
226 | ||
1c4baffc | 227 | r = sd_netlink_add_match(m->rtnl, RTM_NEWADDR, manager_process_address, m); |
74b2466e LP |
228 | if (r < 0) |
229 | return r; | |
091a364c | 230 | |
1c4baffc | 231 | r = sd_netlink_add_match(m->rtnl, RTM_DELADDR, manager_process_address, m); |
74b2466e LP |
232 | if (r < 0) |
233 | return r; | |
234 | ||
235 | /* Then, enumerate all links */ | |
236 | r = sd_rtnl_message_new_link(m->rtnl, &req, RTM_GETLINK, 0); | |
237 | if (r < 0) | |
238 | return r; | |
239 | ||
1c4baffc | 240 | r = sd_netlink_message_request_dump(req, true); |
74b2466e LP |
241 | if (r < 0) |
242 | return r; | |
243 | ||
1c4baffc | 244 | r = sd_netlink_call(m->rtnl, req, 0, &reply); |
74b2466e LP |
245 | if (r < 0) |
246 | return r; | |
247 | ||
1c4baffc | 248 | for (i = reply; i; i = sd_netlink_message_next(i)) { |
74b2466e LP |
249 | r = manager_process_link(m->rtnl, i, m); |
250 | if (r < 0) | |
251 | return r; | |
252 | } | |
253 | ||
1c4baffc TG |
254 | req = sd_netlink_message_unref(req); |
255 | reply = sd_netlink_message_unref(reply); | |
74b2466e LP |
256 | |
257 | /* Finally, enumerate all addresses, too */ | |
258 | r = sd_rtnl_message_new_addr(m->rtnl, &req, RTM_GETADDR, 0, AF_UNSPEC); | |
259 | if (r < 0) | |
260 | return r; | |
261 | ||
1c4baffc | 262 | r = sd_netlink_message_request_dump(req, true); |
74b2466e LP |
263 | if (r < 0) |
264 | return r; | |
265 | ||
1c4baffc | 266 | r = sd_netlink_call(m->rtnl, req, 0, &reply); |
74b2466e LP |
267 | if (r < 0) |
268 | return r; | |
269 | ||
1c4baffc | 270 | for (i = reply; i; i = sd_netlink_message_next(i)) { |
74b2466e LP |
271 | r = manager_process_address(m->rtnl, i, m); |
272 | if (r < 0) | |
273 | return r; | |
274 | } | |
275 | ||
276 | return r; | |
277 | } | |
278 | ||
279 | static int on_network_event(sd_event_source *s, int fd, uint32_t revents, void *userdata) { | |
280 | Manager *m = userdata; | |
281 | Iterator i; | |
282 | Link *l; | |
283 | int r; | |
284 | ||
285 | assert(m); | |
286 | ||
287 | sd_network_monitor_flush(m->network_monitor); | |
288 | ||
289 | HASHMAP_FOREACH(l, m->links, i) { | |
943ef07c | 290 | r = link_update(l); |
74b2466e | 291 | if (r < 0) |
da927ba9 | 292 | log_warning_errno(r, "Failed to update monitor information for %i: %m", l->ifindex); |
74b2466e LP |
293 | } |
294 | ||
7207052d | 295 | (void) manager_write_resolv_conf(m); |
74b2466e LP |
296 | |
297 | return 0; | |
298 | } | |
299 | ||
300 | static int manager_network_monitor_listen(Manager *m) { | |
301 | int r, fd, events; | |
302 | ||
303 | assert(m); | |
304 | ||
0014a4ad | 305 | r = sd_network_monitor_new(&m->network_monitor, NULL); |
74b2466e LP |
306 | if (r < 0) |
307 | return r; | |
308 | ||
309 | fd = sd_network_monitor_get_fd(m->network_monitor); | |
310 | if (fd < 0) | |
311 | return fd; | |
312 | ||
313 | events = sd_network_monitor_get_events(m->network_monitor); | |
314 | if (events < 0) | |
315 | return events; | |
316 | ||
317 | r = sd_event_add_io(m->event, &m->network_event_source, fd, events, &on_network_event, m); | |
318 | if (r < 0) | |
2d895038 LP |
319 | return r; |
320 | ||
321 | r = sd_event_source_set_priority(m->network_event_source, SD_EVENT_PRIORITY_IMPORTANT+5); | |
322 | if (r < 0) | |
74b2466e LP |
323 | return r; |
324 | ||
aa4a9deb LP |
325 | (void) sd_event_source_set_description(m->network_event_source, "network-monitor"); |
326 | ||
74b2466e LP |
327 | return 0; |
328 | } | |
329 | ||
e96de0ce | 330 | static int determine_hostname(char **full_hostname, char **llmnr_hostname, char **mdns_hostname) { |
eb60f9cd | 331 | _cleanup_free_ char *h = NULL, *n = NULL; |
349cc4a5 | 332 | #if HAVE_LIBIDN2 |
87057e24 | 333 | _cleanup_free_ char *utf8 = NULL; |
349cc4a5 | 334 | #elif HAVE_LIBIDN |
87057e24 ZJS |
335 | int k; |
336 | #endif | |
78c6a153 | 337 | char label[DNS_LABEL_MAX]; |
87057e24 ZJS |
338 | const char *p, *decoded; |
339 | int r; | |
eb60f9cd | 340 | |
e96de0ce | 341 | assert(full_hostname); |
78c6a153 LP |
342 | assert(llmnr_hostname); |
343 | assert(mdns_hostname); | |
344 | ||
a25b0dc8 | 345 | /* Extract and normalize the first label of the locally configured hostname, and check it's not "localhost". */ |
eb60f9cd | 346 | |
a25b0dc8 LP |
347 | r = gethostname_strict(&h); |
348 | if (r < 0) | |
349 | return log_debug_errno(r, "Can't determine system hostname: %m"); | |
eb60f9cd | 350 | |
78c6a153 | 351 | p = h; |
87057e24 | 352 | r = dns_label_unescape(&p, label, sizeof label); |
78c6a153 LP |
353 | if (r < 0) |
354 | return log_error_errno(r, "Failed to unescape host name: %m"); | |
355 | if (r == 0) { | |
a25b0dc8 | 356 | log_error("Couldn't find a single label in hostname."); |
78c6a153 LP |
357 | return -EINVAL; |
358 | } | |
359 | ||
349cc4a5 | 360 | #if HAVE_LIBIDN2 |
87057e24 ZJS |
361 | r = idn2_to_unicode_8z8z(label, &utf8, 0); |
362 | if (r != IDN2_OK) | |
363 | return log_error("Failed to undo IDNA: %s", idn2_strerror(r)); | |
364 | assert(utf8_is_valid(utf8)); | |
365 | ||
366 | r = strlen(utf8); | |
367 | decoded = utf8; | |
349cc4a5 | 368 | #elif HAVE_LIBIDN |
87057e24 | 369 | k = dns_label_undo_idna(label, r, label, sizeof label); |
78c6a153 LP |
370 | if (k < 0) |
371 | return log_error_errno(k, "Failed to undo IDNA: %m"); | |
372 | if (k > 0) | |
373 | r = k; | |
374 | ||
375 | if (!utf8_is_valid(label)) { | |
eb60f9cd LP |
376 | log_error("System hostname is not UTF-8 clean."); |
377 | return -EINVAL; | |
378 | } | |
87057e24 ZJS |
379 | decoded = label; |
380 | #else | |
381 | decoded = label; /* no decoding */ | |
382 | #endif | |
eb60f9cd | 383 | |
87057e24 | 384 | r = dns_label_escape_new(decoded, r, &n); |
78c6a153 LP |
385 | if (r < 0) |
386 | return log_error_errno(r, "Failed to escape host name: %m"); | |
387 | ||
388 | if (is_localhost(n)) { | |
389 | log_debug("System hostname is 'localhost', ignoring."); | |
390 | return -EINVAL; | |
eb60f9cd LP |
391 | } |
392 | ||
78c6a153 LP |
393 | r = dns_name_concat(n, "local", mdns_hostname); |
394 | if (r < 0) | |
395 | return log_error_errno(r, "Failed to determine mDNS hostname: %m"); | |
396 | ||
397 | *llmnr_hostname = n; | |
eb60f9cd LP |
398 | n = NULL; |
399 | ||
e96de0ce LP |
400 | *full_hostname = h; |
401 | h = NULL; | |
402 | ||
eb60f9cd LP |
403 | return 0; |
404 | } | |
405 | ||
a25b0dc8 LP |
406 | static const char *fallback_hostname(void) { |
407 | ||
408 | /* Determine the fall back hostname. For exposing this system to the outside world, we cannot have it to be | |
409 | * "localhost" even if that's the compiled in hostname. In this case, let's revert to "linux" instead. */ | |
410 | ||
411 | if (is_localhost(FALLBACK_HOSTNAME)) | |
412 | return "linux"; | |
413 | ||
414 | return FALLBACK_HOSTNAME; | |
415 | } | |
416 | ||
417 | static int make_fallback_hostnames(char **full_hostname, char **llmnr_hostname, char **mdns_hostname) { | |
418 | _cleanup_free_ char *n = NULL, *m = NULL; | |
419 | char label[DNS_LABEL_MAX], *h; | |
420 | const char *p; | |
421 | int r; | |
422 | ||
423 | assert(full_hostname); | |
424 | assert(llmnr_hostname); | |
425 | assert(mdns_hostname); | |
426 | ||
427 | p = fallback_hostname(); | |
428 | r = dns_label_unescape(&p, label, sizeof(label)); | |
429 | if (r < 0) | |
430 | return log_error_errno(r, "Failed to unescape fallback host name: %m"); | |
431 | ||
432 | assert(r > 0); /* The fallback hostname must have at least one label */ | |
433 | ||
434 | r = dns_label_escape_new(label, r, &n); | |
435 | if (r < 0) | |
436 | return log_error_errno(r, "Failed to escape fallback hostname: %m"); | |
437 | ||
438 | r = dns_name_concat(n, "local", &m); | |
439 | if (r < 0) | |
440 | return log_error_errno(r, "Failed to concatenate mDNS hostname: %m"); | |
441 | ||
442 | h = strdup(fallback_hostname()); | |
443 | if (!h) | |
444 | return log_oom(); | |
445 | ||
446 | *llmnr_hostname = n; | |
447 | n = NULL; | |
448 | ||
449 | *mdns_hostname = m; | |
450 | m = NULL; | |
451 | ||
452 | *full_hostname = h; | |
453 | ||
454 | return 0; | |
455 | } | |
456 | ||
eb60f9cd | 457 | static int on_hostname_change(sd_event_source *es, int fd, uint32_t revents, void *userdata) { |
e96de0ce | 458 | _cleanup_free_ char *full_hostname = NULL, *llmnr_hostname = NULL, *mdns_hostname = NULL; |
eb60f9cd LP |
459 | Manager *m = userdata; |
460 | int r; | |
461 | ||
462 | assert(m); | |
463 | ||
e96de0ce | 464 | r = determine_hostname(&full_hostname, &llmnr_hostname, &mdns_hostname); |
eb60f9cd LP |
465 | if (r < 0) |
466 | return 0; /* ignore invalid hostnames */ | |
467 | ||
e96de0ce LP |
468 | if (streq(full_hostname, m->full_hostname) && |
469 | streq(llmnr_hostname, m->llmnr_hostname) && | |
470 | streq(mdns_hostname, m->mdns_hostname)) | |
eb60f9cd LP |
471 | return 0; |
472 | ||
e96de0ce | 473 | log_info("System hostname changed to '%s'.", full_hostname); |
78c6a153 | 474 | |
e96de0ce LP |
475 | free_and_replace(m->full_hostname, full_hostname); |
476 | free_and_replace(m->llmnr_hostname, llmnr_hostname); | |
477 | free_and_replace(m->mdns_hostname, mdns_hostname); | |
eb60f9cd LP |
478 | |
479 | manager_refresh_rrs(m); | |
480 | ||
481 | return 0; | |
482 | } | |
483 | ||
484 | static int manager_watch_hostname(Manager *m) { | |
eb60f9cd LP |
485 | int r; |
486 | ||
487 | assert(m); | |
488 | ||
489 | m->hostname_fd = open("/proc/sys/kernel/hostname", O_RDONLY|O_CLOEXEC|O_NDELAY|O_NOCTTY); | |
490 | if (m->hostname_fd < 0) { | |
56f64d95 | 491 | log_warning_errno(errno, "Failed to watch hostname: %m"); |
eb60f9cd LP |
492 | return 0; |
493 | } | |
494 | ||
495 | r = sd_event_add_io(m->event, &m->hostname_event_source, m->hostname_fd, 0, on_hostname_change, m); | |
496 | if (r < 0) { | |
497 | if (r == -EPERM) | |
498 | /* kernels prior to 3.2 don't support polling this file. Ignore the failure. */ | |
499 | m->hostname_fd = safe_close(m->hostname_fd); | |
8d3d7072 MS |
500 | else |
501 | return log_error_errno(r, "Failed to add hostname event source: %m"); | |
eb60f9cd LP |
502 | } |
503 | ||
aa4a9deb LP |
504 | (void) sd_event_source_set_description(m->hostname_event_source, "hostname"); |
505 | ||
e96de0ce | 506 | r = determine_hostname(&m->full_hostname, &m->llmnr_hostname, &m->mdns_hostname); |
eb60f9cd | 507 | if (r < 0) { |
a25b0dc8 | 508 | log_info("Defaulting to hostname '%s'.", fallback_hostname()); |
78c6a153 | 509 | |
a25b0dc8 LP |
510 | r = make_fallback_hostnames(&m->full_hostname, &m->llmnr_hostname, &m->mdns_hostname); |
511 | if (r < 0) | |
512 | return r; | |
eb60f9cd | 513 | } else |
e96de0ce | 514 | log_info("Using system hostname '%s'.", m->full_hostname); |
eb60f9cd LP |
515 | |
516 | return 0; | |
517 | } | |
518 | ||
4d506d6b LP |
519 | static int manager_sigusr1(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { |
520 | _cleanup_free_ char *buffer = NULL; | |
521 | _cleanup_fclose_ FILE *f = NULL; | |
522 | Manager *m = userdata; | |
cf84484a | 523 | DnsServer *server; |
4d506d6b LP |
524 | size_t size = 0; |
525 | DnsScope *scope; | |
cf84484a LP |
526 | Iterator i; |
527 | Link *l; | |
4d506d6b LP |
528 | |
529 | assert(s); | |
530 | assert(si); | |
531 | assert(m); | |
532 | ||
533 | f = open_memstream(&buffer, &size); | |
534 | if (!f) | |
535 | return log_oom(); | |
536 | ||
537 | LIST_FOREACH(scopes, scope, m->dns_scopes) | |
538 | dns_scope_dump(scope, f); | |
539 | ||
cf84484a LP |
540 | LIST_FOREACH(servers, server, m->dns_servers) |
541 | dns_server_dump(server, f); | |
542 | LIST_FOREACH(servers, server, m->fallback_dns_servers) | |
543 | dns_server_dump(server, f); | |
544 | HASHMAP_FOREACH(l, m->links, i) | |
545 | LIST_FOREACH(servers, server, l->dns_servers) | |
546 | dns_server_dump(server, f); | |
547 | ||
4d506d6b LP |
548 | if (fflush_and_check(f) < 0) |
549 | return log_oom(); | |
550 | ||
551 | log_dump(LOG_INFO, buffer); | |
552 | return 0; | |
553 | } | |
554 | ||
bc81447e LP |
555 | static int manager_sigusr2(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { |
556 | Manager *m = userdata; | |
bc81447e LP |
557 | |
558 | assert(s); | |
559 | assert(si); | |
560 | assert(m); | |
561 | ||
ba35662f | 562 | manager_flush_caches(m); |
ba35662f | 563 | |
bc81447e LP |
564 | return 0; |
565 | } | |
566 | ||
d55b0463 LP |
567 | static int manager_sigrtmin1(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { |
568 | Manager *m = userdata; | |
569 | ||
570 | assert(s); | |
571 | assert(si); | |
572 | assert(m); | |
573 | ||
574 | manager_reset_server_features(m); | |
575 | return 0; | |
576 | } | |
577 | ||
091a364c | 578 | int manager_new(Manager **ret) { |
74b2466e | 579 | _cleanup_(manager_freep) Manager *m = NULL; |
091a364c TG |
580 | int r; |
581 | ||
c92e531c LP |
582 | assert(ret); |
583 | ||
091a364c TG |
584 | m = new0(Manager, 1); |
585 | if (!m) | |
586 | return -ENOMEM; | |
587 | ||
1716f6dc | 588 | m->llmnr_ipv4_udp_fd = m->llmnr_ipv6_udp_fd = -1; |
623a4c97 | 589 | m->llmnr_ipv4_tcp_fd = m->llmnr_ipv6_tcp_fd = -1; |
bc7702b0 | 590 | m->mdns_ipv4_fd = m->mdns_ipv6_fd = -1; |
b30bf55d | 591 | m->dns_stub_udp_fd = m->dns_stub_tcp_fd = -1; |
eb60f9cd | 592 | m->hostname_fd = -1; |
1716f6dc | 593 | |
af49ca27 | 594 | m->llmnr_support = RESOLVE_SUPPORT_YES; |
7bef8e8e | 595 | m->mdns_support = RESOLVE_SUPPORT_YES; |
61ecb465 | 596 | m->dnssec_mode = DEFAULT_DNSSEC_MODE; |
ceeddf79 | 597 | m->enable_cache = true; |
1ae43295 | 598 | m->dns_stub_listener_mode = DNS_STUB_LISTENER_UDP; |
5cb36f41 | 599 | m->read_resolv_conf = true; |
00fa60ae | 600 | m->need_builtin_fallbacks = true; |
dd0bc0f1 | 601 | m->etc_hosts_last = m->etc_hosts_mtime = USEC_INFINITY; |
091a364c | 602 | |
0d2cd476 LP |
603 | r = dns_trust_anchor_load(&m->trust_anchor); |
604 | if (r < 0) | |
605 | return r; | |
606 | ||
ad6c0475 LP |
607 | r = manager_parse_config_file(m); |
608 | if (r < 0) | |
5ce497b5 | 609 | log_warning_errno(r, "Failed to parse configuration file: %m"); |
ad6c0475 | 610 | |
091a364c TG |
611 | r = sd_event_default(&m->event); |
612 | if (r < 0) | |
613 | return r; | |
614 | ||
615 | sd_event_add_signal(m->event, NULL, SIGTERM, NULL, NULL); | |
616 | sd_event_add_signal(m->event, NULL, SIGINT, NULL, NULL); | |
617 | ||
618 | sd_event_set_watchdog(m->event, true); | |
619 | ||
eb60f9cd LP |
620 | r = manager_watch_hostname(m); |
621 | if (r < 0) | |
622 | return r; | |
623 | ||
1716f6dc | 624 | r = dns_scope_new(m, &m->unicast_scope, NULL, DNS_PROTOCOL_DNS, AF_UNSPEC); |
74b2466e LP |
625 | if (r < 0) |
626 | return r; | |
627 | ||
628 | r = manager_network_monitor_listen(m); | |
629 | if (r < 0) | |
630 | return r; | |
631 | ||
632 | r = manager_rtnl_listen(m); | |
633 | if (r < 0) | |
634 | return r; | |
635 | ||
636 | r = manager_connect_bus(m); | |
637 | if (r < 0) | |
638 | return r; | |
639 | ||
4d506d6b | 640 | (void) sd_event_add_signal(m->event, &m->sigusr1_event_source, SIGUSR1, manager_sigusr1, m); |
bc81447e | 641 | (void) sd_event_add_signal(m->event, &m->sigusr2_event_source, SIGUSR2, manager_sigusr2, m); |
d55b0463 | 642 | (void) sd_event_add_signal(m->event, &m->sigrtmin1_event_source, SIGRTMIN+1, manager_sigrtmin1, m); |
4d506d6b | 643 | |
943ef07c LP |
644 | manager_cleanup_saved_user(m); |
645 | ||
091a364c TG |
646 | *ret = m; |
647 | m = NULL; | |
648 | ||
649 | return 0; | |
650 | } | |
651 | ||
edc501d4 LP |
652 | int manager_start(Manager *m) { |
653 | int r; | |
654 | ||
655 | assert(m); | |
656 | ||
b30bf55d LP |
657 | r = manager_dns_stub_start(m); |
658 | if (r < 0) | |
659 | return r; | |
660 | ||
edc501d4 LP |
661 | return 0; |
662 | } | |
663 | ||
74b2466e LP |
664 | Manager *manager_free(Manager *m) { |
665 | Link *l; | |
091a364c TG |
666 | |
667 | if (!m) | |
74b2466e LP |
668 | return NULL; |
669 | ||
4b95f179 LP |
670 | dns_server_unlink_all(m->dns_servers); |
671 | dns_server_unlink_all(m->fallback_dns_servers); | |
a51c1048 LP |
672 | dns_search_domain_unlink_all(m->search_domains); |
673 | ||
74b2466e LP |
674 | while ((l = hashmap_first(m->links))) |
675 | link_free(l); | |
f0e15467 LP |
676 | |
677 | while (m->dns_queries) | |
678 | dns_query_free(m->dns_queries); | |
74b2466e | 679 | |
cab5b059 LP |
680 | dns_scope_free(m->unicast_scope); |
681 | ||
b30bf55d LP |
682 | /* At this point only orphaned streams should remain. All others should have been freed already by their |
683 | * owners */ | |
684 | while (m->dns_streams) | |
685 | dns_stream_unref(m->dns_streams); | |
686 | ||
f0e15467 LP |
687 | hashmap_free(m->links); |
688 | hashmap_free(m->dns_transactions); | |
689 | ||
096b6773 LP |
690 | sd_event_source_unref(m->network_event_source); |
691 | sd_network_monitor_unref(m->network_monitor); | |
091a364c | 692 | |
a564ca2f LP |
693 | sd_netlink_unref(m->rtnl); |
694 | sd_event_source_unref(m->rtnl_event_source); | |
695 | ||
edc501d4 | 696 | manager_llmnr_stop(m); |
bc7702b0 | 697 | manager_mdns_stop(m); |
b30bf55d | 698 | manager_dns_stub_stop(m); |
623a4c97 | 699 | |
902bb5d8 | 700 | sd_bus_slot_unref(m->prepare_for_sleep_slot); |
74b2466e LP |
701 | sd_event_source_unref(m->bus_retry_event_source); |
702 | sd_bus_unref(m->bus); | |
091a364c | 703 | |
4d506d6b | 704 | sd_event_source_unref(m->sigusr1_event_source); |
bc81447e | 705 | sd_event_source_unref(m->sigusr2_event_source); |
d55b0463 | 706 | sd_event_source_unref(m->sigrtmin1_event_source); |
4d506d6b | 707 | |
74b2466e | 708 | sd_event_unref(m->event); |
623a4c97 | 709 | |
78c6a153 LP |
710 | dns_resource_key_unref(m->llmnr_host_ipv4_key); |
711 | dns_resource_key_unref(m->llmnr_host_ipv6_key); | |
400cb36e DR |
712 | dns_resource_key_unref(m->mdns_host_ipv4_key); |
713 | dns_resource_key_unref(m->mdns_host_ipv6_key); | |
eb60f9cd | 714 | |
eb60f9cd | 715 | sd_event_source_unref(m->hostname_event_source); |
d9fcf2ba | 716 | safe_close(m->hostname_fd); |
e96de0ce LP |
717 | |
718 | free(m->full_hostname); | |
78c6a153 LP |
719 | free(m->llmnr_hostname); |
720 | free(m->mdns_hostname); | |
eb60f9cd | 721 | |
0d2cd476 | 722 | dns_trust_anchor_flush(&m->trust_anchor); |
dd0bc0f1 | 723 | manager_etc_hosts_flush(m); |
0d2cd476 | 724 | |
6b430fdb | 725 | return mfree(m); |
091a364c TG |
726 | } |
727 | ||
1716f6dc | 728 | int manager_recv(Manager *m, int fd, DnsProtocol protocol, DnsPacket **ret) { |
74b2466e | 729 | _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL; |
1716f6dc LP |
730 | union { |
731 | struct cmsghdr header; /* For alignment */ | |
40a1eebd | 732 | uint8_t buffer[CMSG_SPACE(MAXSIZE(struct in_pktinfo, struct in6_pktinfo)) |
1716f6dc | 733 | + CMSG_SPACE(int) /* ttl/hoplimit */ |
623a4c97 | 734 | + EXTRA_CMSG_SPACE /* kernel appears to require extra buffer space */]; |
1716f6dc LP |
735 | } control; |
736 | union sockaddr_union sa; | |
74b2466e | 737 | struct msghdr mh = {}; |
1716f6dc | 738 | struct cmsghdr *cmsg; |
74b2466e | 739 | struct iovec iov; |
4edc2c9b LP |
740 | ssize_t ms, l; |
741 | int r; | |
74b2466e LP |
742 | |
743 | assert(m); | |
1716f6dc | 744 | assert(fd >= 0); |
74b2466e LP |
745 | assert(ret); |
746 | ||
4edc2c9b | 747 | ms = next_datagram_size_fd(fd); |
74b2466e | 748 | if (ms < 0) |
4edc2c9b | 749 | return ms; |
74b2466e | 750 | |
51027656 | 751 | r = dns_packet_new(&p, protocol, ms, DNS_PACKET_SIZE_MAX); |
74b2466e LP |
752 | if (r < 0) |
753 | return r; | |
754 | ||
755 | iov.iov_base = DNS_PACKET_DATA(p); | |
756 | iov.iov_len = p->allocated; | |
757 | ||
1716f6dc LP |
758 | mh.msg_name = &sa.sa; |
759 | mh.msg_namelen = sizeof(sa); | |
74b2466e LP |
760 | mh.msg_iov = &iov; |
761 | mh.msg_iovlen = 1; | |
1716f6dc LP |
762 | mh.msg_control = &control; |
763 | mh.msg_controllen = sizeof(control); | |
74b2466e | 764 | |
a38d9945 | 765 | l = recvmsg(fd, &mh, 0); |
f134289a EV |
766 | if (l == 0) |
767 | return 0; | |
74b2466e | 768 | if (l < 0) { |
4c701096 | 769 | if (IN_SET(errno, EAGAIN, EINTR)) |
74b2466e LP |
770 | return 0; |
771 | ||
772 | return -errno; | |
091a364c TG |
773 | } |
774 | ||
1716f6dc LP |
775 | assert(!(mh.msg_flags & MSG_CTRUNC)); |
776 | assert(!(mh.msg_flags & MSG_TRUNC)); | |
777 | ||
74b2466e | 778 | p->size = (size_t) l; |
091a364c | 779 | |
1716f6dc | 780 | p->family = sa.sa.sa_family; |
623a4c97 LP |
781 | p->ipproto = IPPROTO_UDP; |
782 | if (p->family == AF_INET) { | |
1716f6dc | 783 | p->sender.in = sa.in.sin_addr; |
623a4c97 LP |
784 | p->sender_port = be16toh(sa.in.sin_port); |
785 | } else if (p->family == AF_INET6) { | |
1716f6dc | 786 | p->sender.in6 = sa.in6.sin6_addr; |
623a4c97 LP |
787 | p->sender_port = be16toh(sa.in6.sin6_port); |
788 | p->ifindex = sa.in6.sin6_scope_id; | |
789 | } else | |
1716f6dc | 790 | return -EAFNOSUPPORT; |
74b2466e | 791 | |
2a1288ff | 792 | CMSG_FOREACH(cmsg, &mh) { |
74b2466e | 793 | |
1716f6dc LP |
794 | if (cmsg->cmsg_level == IPPROTO_IPV6) { |
795 | assert(p->family == AF_INET6); | |
74b2466e | 796 | |
1716f6dc | 797 | switch (cmsg->cmsg_type) { |
74b2466e | 798 | |
1716f6dc LP |
799 | case IPV6_PKTINFO: { |
800 | struct in6_pktinfo *i = (struct in6_pktinfo*) CMSG_DATA(cmsg); | |
74b2466e | 801 | |
623a4c97 LP |
802 | if (p->ifindex <= 0) |
803 | p->ifindex = i->ipi6_ifindex; | |
804 | ||
1716f6dc LP |
805 | p->destination.in6 = i->ipi6_addr; |
806 | break; | |
807 | } | |
74b2466e | 808 | |
1716f6dc LP |
809 | case IPV6_HOPLIMIT: |
810 | p->ttl = *(int *) CMSG_DATA(cmsg); | |
811 | break; | |
74b2466e | 812 | |
1716f6dc LP |
813 | } |
814 | } else if (cmsg->cmsg_level == IPPROTO_IP) { | |
815 | assert(p->family == AF_INET); | |
74b2466e | 816 | |
1716f6dc | 817 | switch (cmsg->cmsg_type) { |
74b2466e | 818 | |
1716f6dc LP |
819 | case IP_PKTINFO: { |
820 | struct in_pktinfo *i = (struct in_pktinfo*) CMSG_DATA(cmsg); | |
091a364c | 821 | |
623a4c97 LP |
822 | if (p->ifindex <= 0) |
823 | p->ifindex = i->ipi_ifindex; | |
824 | ||
1716f6dc LP |
825 | p->destination.in = i->ipi_addr; |
826 | break; | |
827 | } | |
74b2466e | 828 | |
623a4c97 | 829 | case IP_TTL: |
1716f6dc LP |
830 | p->ttl = *(int *) CMSG_DATA(cmsg); |
831 | break; | |
832 | } | |
833 | } | |
834 | } | |
74b2466e | 835 | |
623a4c97 LP |
836 | /* The Linux kernel sets the interface index to the loopback |
837 | * device if the packet came from the local host since it | |
838 | * avoids the routing table in such a case. Let's unset the | |
839 | * interface index in such a case. */ | |
a5f03596 | 840 | if (p->ifindex == LOOPBACK_IFINDEX) |
623a4c97 LP |
841 | p->ifindex = 0; |
842 | ||
86ad4cd7 TG |
843 | if (protocol != DNS_PROTOCOL_DNS) { |
844 | /* If we don't know the interface index still, we look for the | |
845 | * first local interface with a matching address. Yuck! */ | |
846 | if (p->ifindex <= 0) | |
847 | p->ifindex = manager_find_ifindex(m, p->family, &p->destination); | |
848 | } | |
623a4c97 | 849 | |
74b2466e LP |
850 | *ret = p; |
851 | p = NULL; | |
852 | ||
853 | return 1; | |
854 | } | |
855 | ||
74b2466e LP |
856 | static int sendmsg_loop(int fd, struct msghdr *mh, int flags) { |
857 | int r; | |
858 | ||
859 | assert(fd >= 0); | |
860 | assert(mh); | |
861 | ||
862 | for (;;) { | |
863 | if (sendmsg(fd, mh, flags) >= 0) | |
864 | return 0; | |
865 | ||
866 | if (errno == EINTR) | |
867 | continue; | |
868 | ||
869 | if (errno != EAGAIN) | |
870 | return -errno; | |
871 | ||
872 | r = fd_wait_for_event(fd, POLLOUT, SEND_TIMEOUT_USEC); | |
873 | if (r < 0) | |
874 | return r; | |
875 | if (r == 0) | |
876 | return -ETIMEDOUT; | |
877 | } | |
878 | } | |
879 | ||
72290734 TG |
880 | static int write_loop(int fd, void *message, size_t length) { |
881 | int r; | |
882 | ||
883 | assert(fd >= 0); | |
884 | assert(message); | |
885 | ||
886 | for (;;) { | |
887 | if (write(fd, message, length) >= 0) | |
888 | return 0; | |
889 | ||
890 | if (errno == EINTR) | |
891 | continue; | |
892 | ||
893 | if (errno != EAGAIN) | |
894 | return -errno; | |
895 | ||
896 | r = fd_wait_for_event(fd, POLLOUT, SEND_TIMEOUT_USEC); | |
897 | if (r < 0) | |
898 | return r; | |
899 | if (r == 0) | |
900 | return -ETIMEDOUT; | |
901 | } | |
902 | } | |
903 | ||
904 | int manager_write(Manager *m, int fd, DnsPacket *p) { | |
905 | int r; | |
906 | ||
deb3f3d3 | 907 | log_debug("Sending %s packet with id %" PRIu16 ".", DNS_PACKET_QR(p) ? "response" : "query", DNS_PACKET_ID(p)); |
72290734 TG |
908 | |
909 | r = write_loop(fd, DNS_PACKET_DATA(p), p->size); | |
910 | if (r < 0) | |
911 | return r; | |
912 | ||
913 | return 0; | |
914 | } | |
915 | ||
b30bf55d LP |
916 | static int manager_ipv4_send( |
917 | Manager *m, | |
918 | int fd, | |
919 | int ifindex, | |
920 | const struct in_addr *destination, | |
921 | uint16_t port, | |
922 | const struct in_addr *source, | |
923 | DnsPacket *p) { | |
74b2466e LP |
924 | union sockaddr_union sa = { |
925 | .in.sin_family = AF_INET, | |
74b2466e | 926 | }; |
1716f6dc LP |
927 | union { |
928 | struct cmsghdr header; /* For alignment */ | |
929 | uint8_t buffer[CMSG_SPACE(sizeof(struct in_pktinfo))]; | |
930 | } control; | |
74b2466e LP |
931 | struct msghdr mh = {}; |
932 | struct iovec iov; | |
74b2466e LP |
933 | |
934 | assert(m); | |
1716f6dc | 935 | assert(fd >= 0); |
b30bf55d | 936 | assert(destination); |
1716f6dc | 937 | assert(port > 0); |
74b2466e LP |
938 | assert(p); |
939 | ||
74b2466e LP |
940 | iov.iov_base = DNS_PACKET_DATA(p); |
941 | iov.iov_len = p->size; | |
091a364c | 942 | |
b30bf55d | 943 | sa.in.sin_addr = *destination; |
1716f6dc | 944 | sa.in.sin_port = htobe16(port), |
091a364c | 945 | |
74b2466e LP |
946 | mh.msg_iov = &iov; |
947 | mh.msg_iovlen = 1; | |
948 | mh.msg_name = &sa.sa; | |
949 | mh.msg_namelen = sizeof(sa.in); | |
091a364c | 950 | |
74b2466e LP |
951 | if (ifindex > 0) { |
952 | struct cmsghdr *cmsg; | |
953 | struct in_pktinfo *pi; | |
954 | ||
955 | zero(control); | |
956 | ||
1716f6dc | 957 | mh.msg_control = &control; |
74b2466e LP |
958 | mh.msg_controllen = CMSG_LEN(sizeof(struct in_pktinfo)); |
959 | ||
960 | cmsg = CMSG_FIRSTHDR(&mh); | |
961 | cmsg->cmsg_len = mh.msg_controllen; | |
962 | cmsg->cmsg_level = IPPROTO_IP; | |
963 | cmsg->cmsg_type = IP_PKTINFO; | |
964 | ||
965 | pi = (struct in_pktinfo*) CMSG_DATA(cmsg); | |
966 | pi->ipi_ifindex = ifindex; | |
b30bf55d LP |
967 | |
968 | if (source) | |
969 | pi->ipi_spec_dst = *source; | |
74b2466e LP |
970 | } |
971 | ||
972 | return sendmsg_loop(fd, &mh, 0); | |
973 | } | |
974 | ||
b30bf55d LP |
975 | static int manager_ipv6_send( |
976 | Manager *m, | |
977 | int fd, | |
978 | int ifindex, | |
979 | const struct in6_addr *destination, | |
980 | uint16_t port, | |
981 | const struct in6_addr *source, | |
982 | DnsPacket *p) { | |
983 | ||
74b2466e LP |
984 | union sockaddr_union sa = { |
985 | .in6.sin6_family = AF_INET6, | |
74b2466e | 986 | }; |
1716f6dc LP |
987 | union { |
988 | struct cmsghdr header; /* For alignment */ | |
989 | uint8_t buffer[CMSG_SPACE(sizeof(struct in6_pktinfo))]; | |
990 | } control; | |
74b2466e LP |
991 | struct msghdr mh = {}; |
992 | struct iovec iov; | |
74b2466e LP |
993 | |
994 | assert(m); | |
1716f6dc | 995 | assert(fd >= 0); |
b30bf55d | 996 | assert(destination); |
1716f6dc | 997 | assert(port > 0); |
74b2466e LP |
998 | assert(p); |
999 | ||
74b2466e LP |
1000 | iov.iov_base = DNS_PACKET_DATA(p); |
1001 | iov.iov_len = p->size; | |
1002 | ||
b30bf55d | 1003 | sa.in6.sin6_addr = *destination; |
1716f6dc | 1004 | sa.in6.sin6_port = htobe16(port), |
74b2466e LP |
1005 | sa.in6.sin6_scope_id = ifindex; |
1006 | ||
1007 | mh.msg_iov = &iov; | |
1008 | mh.msg_iovlen = 1; | |
1009 | mh.msg_name = &sa.sa; | |
1010 | mh.msg_namelen = sizeof(sa.in6); | |
1011 | ||
1012 | if (ifindex > 0) { | |
1013 | struct cmsghdr *cmsg; | |
1014 | struct in6_pktinfo *pi; | |
1015 | ||
1016 | zero(control); | |
1017 | ||
1716f6dc | 1018 | mh.msg_control = &control; |
74b2466e LP |
1019 | mh.msg_controllen = CMSG_LEN(sizeof(struct in6_pktinfo)); |
1020 | ||
1021 | cmsg = CMSG_FIRSTHDR(&mh); | |
1022 | cmsg->cmsg_len = mh.msg_controllen; | |
1023 | cmsg->cmsg_level = IPPROTO_IPV6; | |
1024 | cmsg->cmsg_type = IPV6_PKTINFO; | |
1025 | ||
1026 | pi = (struct in6_pktinfo*) CMSG_DATA(cmsg); | |
1027 | pi->ipi6_ifindex = ifindex; | |
b30bf55d LP |
1028 | |
1029 | if (source) | |
1030 | pi->ipi6_addr = *source; | |
74b2466e LP |
1031 | } |
1032 | ||
1033 | return sendmsg_loop(fd, &mh, 0); | |
1034 | } | |
1035 | ||
b30bf55d LP |
1036 | int manager_send( |
1037 | Manager *m, | |
1038 | int fd, | |
1039 | int ifindex, | |
1040 | int family, | |
1041 | const union in_addr_union *destination, | |
1042 | uint16_t port, | |
1043 | const union in_addr_union *source, | |
1044 | DnsPacket *p) { | |
1045 | ||
1716f6dc LP |
1046 | assert(m); |
1047 | assert(fd >= 0); | |
b30bf55d | 1048 | assert(destination); |
1716f6dc LP |
1049 | assert(port > 0); |
1050 | assert(p); | |
1051 | ||
deb3f3d3 | 1052 | 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 | 1053 | |
1716f6dc | 1054 | if (family == AF_INET) |
b30bf55d | 1055 | return manager_ipv4_send(m, fd, ifindex, &destination->in, port, &source->in, p); |
2817157b | 1056 | if (family == AF_INET6) |
b30bf55d | 1057 | return manager_ipv6_send(m, fd, ifindex, &destination->in6, port, &source->in6, p); |
1716f6dc LP |
1058 | |
1059 | return -EAFNOSUPPORT; | |
1060 | } | |
1061 | ||
e1c95994 LP |
1062 | uint32_t manager_find_mtu(Manager *m) { |
1063 | uint32_t mtu = 0; | |
1064 | Link *l; | |
1065 | Iterator i; | |
1066 | ||
1067 | /* If we don't know on which link a DNS packet would be | |
1068 | * delivered, let's find the largest MTU that works on all | |
1069 | * interfaces we know of */ | |
1070 | ||
1071 | HASHMAP_FOREACH(l, m->links, i) { | |
1072 | if (l->mtu <= 0) | |
1073 | continue; | |
1074 | ||
1075 | if (mtu <= 0 || l->mtu < mtu) | |
1076 | mtu = l->mtu; | |
1077 | } | |
1078 | ||
1079 | return mtu; | |
1080 | } | |
1716f6dc | 1081 | |
623a4c97 | 1082 | int manager_find_ifindex(Manager *m, int family, const union in_addr_union *in_addr) { |
ec2c5e43 LP |
1083 | LinkAddress *a; |
1084 | ||
1085 | assert(m); | |
1086 | ||
4e945a6f | 1087 | a = manager_find_link_address(m, family, in_addr); |
ec2c5e43 LP |
1088 | if (a) |
1089 | return a->link->ifindex; | |
1090 | ||
1091 | return 0; | |
1092 | } | |
1093 | ||
eb60f9cd LP |
1094 | void manager_refresh_rrs(Manager *m) { |
1095 | Iterator i; | |
1096 | Link *l; | |
1097 | ||
1098 | assert(m); | |
1099 | ||
78c6a153 LP |
1100 | m->llmnr_host_ipv4_key = dns_resource_key_unref(m->llmnr_host_ipv4_key); |
1101 | m->llmnr_host_ipv6_key = dns_resource_key_unref(m->llmnr_host_ipv6_key); | |
400cb36e DR |
1102 | m->mdns_host_ipv4_key = dns_resource_key_unref(m->mdns_host_ipv4_key); |
1103 | m->mdns_host_ipv6_key = dns_resource_key_unref(m->mdns_host_ipv6_key); | |
eb60f9cd LP |
1104 | |
1105 | HASHMAP_FOREACH(l, m->links, i) { | |
1106 | link_add_rrs(l, true); | |
1107 | link_add_rrs(l, false); | |
1108 | } | |
1109 | } | |
1110 | ||
ec2c5e43 LP |
1111 | int manager_next_hostname(Manager *m) { |
1112 | const char *p; | |
556a2294 | 1113 | uint64_t u, a; |
78c6a153 LP |
1114 | char *h, *k; |
1115 | int r; | |
623a4c97 LP |
1116 | |
1117 | assert(m); | |
1118 | ||
78c6a153 | 1119 | p = strchr(m->llmnr_hostname, 0); |
ec2c5e43 LP |
1120 | assert(p); |
1121 | ||
78c6a153 | 1122 | while (p > m->llmnr_hostname) { |
ec2c5e43 LP |
1123 | if (!strchr("0123456789", p[-1])) |
1124 | break; | |
1125 | ||
1126 | p--; | |
1127 | } | |
1128 | ||
1129 | if (*p == 0 || safe_atou64(p, &u) < 0 || u <= 0) | |
1130 | u = 1; | |
1131 | ||
556a2294 LP |
1132 | /* Add a random number to the old value. This way we can avoid |
1133 | * that two hosts pick the same hostname, win on IPv4 and lose | |
1134 | * on IPv6 (or vice versa), and pick the same hostname | |
1135 | * replacement hostname, ad infinitum. We still want the | |
1136 | * numbers to go up monotonically, hence we just add a random | |
1137 | * value 1..10 */ | |
1138 | ||
1139 | random_bytes(&a, sizeof(a)); | |
1140 | u += 1 + a % 10; | |
ec2c5e43 | 1141 | |
78c6a153 | 1142 | if (asprintf(&h, "%.*s%" PRIu64, (int) (p - m->llmnr_hostname), m->llmnr_hostname, u) < 0) |
ec2c5e43 LP |
1143 | return -ENOMEM; |
1144 | ||
78c6a153 LP |
1145 | r = dns_name_concat(h, "local", &k); |
1146 | if (r < 0) { | |
1147 | free(h); | |
1148 | return r; | |
1149 | } | |
1150 | ||
1151 | log_info("Hostname conflict, changing published hostname from '%s' to '%s'.", m->llmnr_hostname, h); | |
1152 | ||
1153 | free(m->llmnr_hostname); | |
1154 | m->llmnr_hostname = h; | |
ec2c5e43 | 1155 | |
78c6a153 LP |
1156 | free(m->mdns_hostname); |
1157 | m->mdns_hostname = k; | |
ec2c5e43 | 1158 | |
eb60f9cd | 1159 | manager_refresh_rrs(m); |
623a4c97 LP |
1160 | |
1161 | return 0; | |
1162 | } | |
ec2c5e43 | 1163 | |
4e945a6f | 1164 | LinkAddress* manager_find_link_address(Manager *m, int family, const union in_addr_union *in_addr) { |
ec2c5e43 LP |
1165 | Iterator i; |
1166 | Link *l; | |
1167 | ||
1168 | assert(m); | |
1169 | ||
1170 | HASHMAP_FOREACH(l, m->links, i) { | |
1171 | LinkAddress *a; | |
1172 | ||
1173 | a = link_find_address(l, family, in_addr); | |
1174 | if (a) | |
1175 | return a; | |
1176 | } | |
1177 | ||
1178 | return NULL; | |
1179 | } | |
1180 | ||
a4076574 | 1181 | bool manager_our_packet(Manager *m, DnsPacket *p) { |
ec2c5e43 LP |
1182 | assert(m); |
1183 | assert(p); | |
1184 | ||
4e945a6f | 1185 | return !!manager_find_link_address(m, p->family, &p->sender); |
ec2c5e43 | 1186 | } |
4e945a6f | 1187 | |
a4076574 LP |
1188 | DnsScope* manager_find_scope(Manager *m, DnsPacket *p) { |
1189 | Link *l; | |
1190 | ||
1191 | assert(m); | |
1192 | assert(p); | |
1193 | ||
1194 | l = hashmap_get(m->links, INT_TO_PTR(p->ifindex)); | |
1195 | if (!l) | |
1196 | return NULL; | |
1197 | ||
b4f1862d DM |
1198 | switch (p->protocol) { |
1199 | case DNS_PROTOCOL_LLMNR: | |
a4076574 LP |
1200 | if (p->family == AF_INET) |
1201 | return l->llmnr_ipv4_scope; | |
1202 | else if (p->family == AF_INET6) | |
1203 | return l->llmnr_ipv6_scope; | |
b4f1862d DM |
1204 | |
1205 | break; | |
1206 | ||
1207 | case DNS_PROTOCOL_MDNS: | |
1208 | if (p->family == AF_INET) | |
1209 | return l->mdns_ipv4_scope; | |
1210 | else if (p->family == AF_INET6) | |
1211 | return l->mdns_ipv6_scope; | |
1212 | ||
1213 | break; | |
1214 | ||
1215 | default: | |
1216 | break; | |
a4076574 LP |
1217 | } |
1218 | ||
1219 | return NULL; | |
1220 | } | |
1221 | ||
902bb5d8 LP |
1222 | void manager_verify_all(Manager *m) { |
1223 | DnsScope *s; | |
1224 | ||
1225 | assert(m); | |
1226 | ||
1227 | LIST_FOREACH(scopes, s, m->dns_scopes) | |
1228 | dns_zone_verify_all(&s->zone); | |
1229 | } | |
1230 | ||
78c6a153 | 1231 | int manager_is_own_hostname(Manager *m, const char *name) { |
78c6a153 LP |
1232 | int r; |
1233 | ||
1234 | assert(m); | |
1235 | assert(name); | |
1236 | ||
1237 | if (m->llmnr_hostname) { | |
1238 | r = dns_name_equal(name, m->llmnr_hostname); | |
1239 | if (r != 0) | |
1240 | return r; | |
1241 | } | |
1242 | ||
e96de0ce LP |
1243 | if (m->mdns_hostname) { |
1244 | r = dns_name_equal(name, m->mdns_hostname); | |
1245 | if (r != 0) | |
1246 | return r; | |
1247 | } | |
1248 | ||
1249 | if (m->full_hostname) | |
1250 | return dns_name_equal(name, m->full_hostname); | |
78c6a153 LP |
1251 | |
1252 | return 0; | |
1253 | } | |
1254 | ||
9176a57c LP |
1255 | int manager_compile_dns_servers(Manager *m, OrderedSet **dns) { |
1256 | DnsServer *s; | |
1257 | Iterator i; | |
1258 | Link *l; | |
1259 | int r; | |
1260 | ||
1261 | assert(m); | |
1262 | assert(dns); | |
1263 | ||
1264 | r = ordered_set_ensure_allocated(dns, &dns_server_hash_ops); | |
1265 | if (r < 0) | |
1266 | return r; | |
1267 | ||
1268 | /* First add the system-wide servers and domains */ | |
1269 | LIST_FOREACH(servers, s, m->dns_servers) { | |
1270 | r = ordered_set_put(*dns, s); | |
1271 | if (r == -EEXIST) | |
1272 | continue; | |
1273 | if (r < 0) | |
1274 | return r; | |
1275 | } | |
1276 | ||
1277 | /* Then, add the per-link servers */ | |
1278 | HASHMAP_FOREACH(l, m->links, i) { | |
1279 | LIST_FOREACH(servers, s, l->dns_servers) { | |
1280 | r = ordered_set_put(*dns, s); | |
1281 | if (r == -EEXIST) | |
1282 | continue; | |
1283 | if (r < 0) | |
1284 | return r; | |
1285 | } | |
1286 | } | |
1287 | ||
1288 | /* If we found nothing, add the fallback servers */ | |
1289 | if (ordered_set_isempty(*dns)) { | |
1290 | LIST_FOREACH(servers, s, m->fallback_dns_servers) { | |
1291 | r = ordered_set_put(*dns, s); | |
1292 | if (r == -EEXIST) | |
1293 | continue; | |
1294 | if (r < 0) | |
1295 | return r; | |
1296 | } | |
1297 | } | |
1298 | ||
1299 | return 0; | |
1300 | } | |
1301 | ||
94363cbb MP |
1302 | /* filter_route is a tri-state: |
1303 | * < 0: no filtering | |
1304 | * = 0 or false: return only domains which should be used for searching | |
1305 | * > 0 or true: return only domains which are for routing only | |
1306 | */ | |
6f7da49d | 1307 | int manager_compile_search_domains(Manager *m, OrderedSet **domains, int filter_route) { |
9176a57c LP |
1308 | DnsSearchDomain *d; |
1309 | Iterator i; | |
1310 | Link *l; | |
1311 | int r; | |
1312 | ||
1313 | assert(m); | |
1314 | assert(domains); | |
1315 | ||
1316 | r = ordered_set_ensure_allocated(domains, &dns_name_hash_ops); | |
1317 | if (r < 0) | |
1318 | return r; | |
1319 | ||
1320 | LIST_FOREACH(domains, d, m->search_domains) { | |
6f7da49d LP |
1321 | |
1322 | if (filter_route >= 0 && | |
1323 | d->route_only != !!filter_route) | |
1324 | continue; | |
1325 | ||
9176a57c LP |
1326 | r = ordered_set_put(*domains, d->name); |
1327 | if (r == -EEXIST) | |
1328 | continue; | |
1329 | if (r < 0) | |
1330 | return r; | |
1331 | } | |
1332 | ||
1333 | HASHMAP_FOREACH(l, m->links, i) { | |
1334 | ||
1335 | LIST_FOREACH(domains, d, l->search_domains) { | |
6f7da49d LP |
1336 | |
1337 | if (filter_route >= 0 && | |
1338 | d->route_only != !!filter_route) | |
1339 | continue; | |
1340 | ||
9176a57c LP |
1341 | r = ordered_set_put(*domains, d->name); |
1342 | if (r == -EEXIST) | |
1343 | continue; | |
1344 | if (r < 0) | |
1345 | return r; | |
1346 | } | |
1347 | } | |
1348 | ||
1349 | return 0; | |
1350 | } | |
c69fa7e3 LP |
1351 | |
1352 | DnssecMode manager_get_dnssec_mode(Manager *m) { | |
1353 | assert(m); | |
1354 | ||
1355 | if (m->dnssec_mode != _DNSSEC_MODE_INVALID) | |
1356 | return m->dnssec_mode; | |
1357 | ||
1358 | return DNSSEC_NO; | |
1359 | } | |
1360 | ||
1361 | bool manager_dnssec_supported(Manager *m) { | |
1362 | DnsServer *server; | |
1363 | Iterator i; | |
1364 | Link *l; | |
1365 | ||
1366 | assert(m); | |
1367 | ||
1368 | if (manager_get_dnssec_mode(m) == DNSSEC_NO) | |
1369 | return false; | |
1370 | ||
1371 | server = manager_get_dns_server(m); | |
1372 | if (server && !dns_server_dnssec_supported(server)) | |
1373 | return false; | |
1374 | ||
1375 | HASHMAP_FOREACH(l, m->links, i) | |
1376 | if (!link_dnssec_supported(l)) | |
1377 | return false; | |
1378 | ||
1379 | return true; | |
1380 | } | |
59c5b597 LP |
1381 | |
1382 | void manager_dnssec_verdict(Manager *m, DnssecVerdict verdict, const DnsResourceKey *key) { | |
1383 | ||
1384 | assert(verdict >= 0); | |
1385 | assert(verdict < _DNSSEC_VERDICT_MAX); | |
1386 | ||
1387 | if (log_get_max_level() >= LOG_DEBUG) { | |
202b76ae | 1388 | char s[DNS_RESOURCE_KEY_STRING_MAX]; |
59c5b597 | 1389 | |
202b76ae ZJS |
1390 | log_debug("Found verdict for lookup %s: %s", |
1391 | dns_resource_key_to_string(key, s, sizeof s), | |
1392 | dnssec_verdict_to_string(verdict)); | |
59c5b597 LP |
1393 | } |
1394 | ||
1395 | m->n_dnssec_verdict[verdict]++; | |
1396 | } | |
011696f7 LP |
1397 | |
1398 | bool manager_routable(Manager *m, int family) { | |
1399 | Iterator i; | |
1400 | Link *l; | |
1401 | ||
1402 | assert(m); | |
1403 | ||
1404 | /* Returns true if the host has at least one interface with a routable address of the specified type */ | |
1405 | ||
1406 | HASHMAP_FOREACH(l, m->links, i) | |
1407 | if (link_relevant(l, family, false)) | |
1408 | return true; | |
1409 | ||
1410 | return false; | |
1411 | } | |
ba35662f LP |
1412 | |
1413 | void manager_flush_caches(Manager *m) { | |
1414 | DnsScope *scope; | |
1415 | ||
1416 | assert(m); | |
1417 | ||
1418 | LIST_FOREACH(scopes, scope, m->dns_scopes) | |
1419 | dns_cache_flush(&scope->cache); | |
aac57b35 ZJS |
1420 | |
1421 | log_info("Flushed all caches."); | |
ba35662f | 1422 | } |
943ef07c | 1423 | |
59c0fd0e LP |
1424 | void manager_reset_server_features(Manager *m) { |
1425 | Iterator i; | |
1426 | Link *l; | |
1427 | ||
1428 | dns_server_reset_features_all(m->dns_servers); | |
1429 | dns_server_reset_features_all(m->fallback_dns_servers); | |
1430 | ||
1431 | HASHMAP_FOREACH(l, m->links, i) | |
1432 | dns_server_reset_features_all(l->dns_servers); | |
1433 | ||
1434 | log_info("Resetting learnt feature levels on all servers."); | |
1435 | } | |
1436 | ||
943ef07c LP |
1437 | void manager_cleanup_saved_user(Manager *m) { |
1438 | _cleanup_closedir_ DIR *d = NULL; | |
1439 | struct dirent *de; | |
1440 | int r; | |
1441 | ||
1442 | assert(m); | |
1443 | ||
1444 | /* Clean up all saved per-link files in /run/systemd/resolve/netif/ that don't have a matching interface | |
1445 | * anymore. These files are created to persist settings pushed in by the user via the bus, so that resolved can | |
1446 | * be restarted without losing this data. */ | |
1447 | ||
1448 | d = opendir("/run/systemd/resolve/netif/"); | |
1449 | if (!d) { | |
1450 | if (errno == ENOENT) | |
1451 | return; | |
1452 | ||
1453 | log_warning_errno(errno, "Failed to open interface directory: %m"); | |
1454 | return; | |
1455 | } | |
1456 | ||
1457 | FOREACH_DIRENT_ALL(de, d, log_error_errno(errno, "Failed to read interface directory: %m")) { | |
1458 | _cleanup_free_ char *p = NULL; | |
1459 | int ifindex; | |
1460 | Link *l; | |
1461 | ||
1462 | if (!IN_SET(de->d_type, DT_UNKNOWN, DT_REG)) | |
1463 | continue; | |
1464 | ||
49bfc877 | 1465 | if (dot_or_dot_dot(de->d_name)) |
943ef07c LP |
1466 | continue; |
1467 | ||
1468 | r = parse_ifindex(de->d_name, &ifindex); | |
1469 | if (r < 0) /* Probably some temporary file from a previous run. Delete it */ | |
1470 | goto rm; | |
1471 | ||
1472 | l = hashmap_get(m->links, INT_TO_PTR(ifindex)); | |
1473 | if (!l) /* link vanished */ | |
1474 | goto rm; | |
1475 | ||
1476 | if (l->is_managed) /* now managed by networkd, hence the bus settings are useless */ | |
1477 | goto rm; | |
1478 | ||
1479 | continue; | |
1480 | ||
1481 | rm: | |
1482 | p = strappend("/run/systemd/resolve/netif/", de->d_name); | |
1483 | if (!p) { | |
1484 | log_oom(); | |
1485 | return; | |
1486 | } | |
1487 | ||
1488 | (void) unlink(p); | |
1489 | } | |
1490 | } |