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Commit | Line | Data |
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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> | |
0d536673 | 23 | #include <stdio_ext.h> |
74b2466e | 24 | #include <sys/ioctl.h> |
091a364c | 25 | |
349cc4a5 | 26 | #if HAVE_LIBIDN2 |
87057e24 ZJS |
27 | #include <idn2.h> |
28 | #endif | |
29 | ||
a2a416f7 | 30 | #include "af-list.h" |
b5efdb8a | 31 | #include "alloc-util.h" |
943ef07c | 32 | #include "dirent-util.h" |
07630cea | 33 | #include "dns-domain.h" |
3ffd4af2 | 34 | #include "fd-util.h" |
a5a807e6 | 35 | #include "fileio-label.h" |
07630cea | 36 | #include "hostname-util.h" |
c004493c | 37 | #include "io-util.h" |
07630cea LP |
38 | #include "netlink-util.h" |
39 | #include "network-internal.h" | |
822db23c | 40 | #include "ordered-set.h" |
6bedfcbb | 41 | #include "parse-util.h" |
3df3e884 | 42 | #include "random-util.h" |
39d8db04 | 43 | #include "resolved-bus.h" |
07630cea | 44 | #include "resolved-conf.h" |
6501dd31 | 45 | #include "resolved-dnssd.h" |
b30bf55d | 46 | #include "resolved-dns-stub.h" |
dd0bc0f1 | 47 | #include "resolved-etc-hosts.h" |
5f402ae8 | 48 | #include "resolved-llmnr.h" |
07630cea | 49 | #include "resolved-manager.h" |
bc7702b0 | 50 | #include "resolved-mdns.h" |
dd0bc0f1 | 51 | #include "resolved-resolv-conf.h" |
07630cea | 52 | #include "socket-util.h" |
8b43440b | 53 | #include "string-table.h" |
07630cea LP |
54 | #include "string-util.h" |
55 | #include "utf8.h" | |
74b2466e LP |
56 | |
57 | #define SEND_TIMEOUT_USEC (200 * USEC_PER_MSEC) | |
58 | ||
1c4baffc | 59 | static int manager_process_link(sd_netlink *rtnl, sd_netlink_message *mm, void *userdata) { |
74b2466e LP |
60 | Manager *m = userdata; |
61 | uint16_t type; | |
62 | Link *l; | |
63 | int ifindex, r; | |
64 | ||
65 | assert(rtnl); | |
66 | assert(m); | |
67 | assert(mm); | |
68 | ||
1c4baffc | 69 | r = sd_netlink_message_get_type(mm, &type); |
74b2466e LP |
70 | if (r < 0) |
71 | goto fail; | |
72 | ||
73 | r = sd_rtnl_message_link_get_ifindex(mm, &ifindex); | |
74 | if (r < 0) | |
75 | goto fail; | |
76 | ||
77 | l = hashmap_get(m->links, INT_TO_PTR(ifindex)); | |
78 | ||
79 | switch (type) { | |
80 | ||
a2a416f7 LP |
81 | case RTM_NEWLINK:{ |
82 | bool is_new = !l; | |
74b2466e | 83 | |
a2a416f7 | 84 | if (!l) { |
74b2466e LP |
85 | r = link_new(m, &l, ifindex); |
86 | if (r < 0) | |
87 | goto fail; | |
88 | } | |
89 | ||
943ef07c | 90 | r = link_process_rtnl(l, mm); |
74b2466e LP |
91 | if (r < 0) |
92 | goto fail; | |
93 | ||
943ef07c | 94 | r = link_update(l); |
21d73c87 LP |
95 | if (r < 0) |
96 | goto fail; | |
97 | ||
a2a416f7 LP |
98 | if (is_new) |
99 | log_debug("Found new link %i/%s", ifindex, l->name); | |
100 | ||
74b2466e | 101 | break; |
a2a416f7 | 102 | } |
74b2466e LP |
103 | |
104 | case RTM_DELLINK: | |
105 | if (l) { | |
a2a416f7 | 106 | log_debug("Removing link %i/%s", l->ifindex, l->name); |
943ef07c | 107 | link_remove_user(l); |
74b2466e LP |
108 | link_free(l); |
109 | } | |
110 | ||
111 | break; | |
112 | } | |
113 | ||
114 | return 0; | |
115 | ||
116 | fail: | |
da927ba9 | 117 | log_warning_errno(r, "Failed to process RTNL link message: %m"); |
74b2466e LP |
118 | return 0; |
119 | } | |
120 | ||
1c4baffc | 121 | static int manager_process_address(sd_netlink *rtnl, sd_netlink_message *mm, void *userdata) { |
74b2466e LP |
122 | Manager *m = userdata; |
123 | union in_addr_union address; | |
74b2466e | 124 | uint16_t type; |
0dd25fb9 | 125 | int r, ifindex, family; |
74b2466e LP |
126 | LinkAddress *a; |
127 | Link *l; | |
128 | ||
129 | assert(rtnl); | |
130 | assert(mm); | |
131 | assert(m); | |
132 | ||
1c4baffc | 133 | r = sd_netlink_message_get_type(mm, &type); |
74b2466e LP |
134 | if (r < 0) |
135 | goto fail; | |
136 | ||
137 | r = sd_rtnl_message_addr_get_ifindex(mm, &ifindex); | |
138 | if (r < 0) | |
139 | goto fail; | |
140 | ||
141 | l = hashmap_get(m->links, INT_TO_PTR(ifindex)); | |
142 | if (!l) | |
143 | return 0; | |
144 | ||
145 | r = sd_rtnl_message_addr_get_family(mm, &family); | |
146 | if (r < 0) | |
147 | goto fail; | |
148 | ||
149 | switch (family) { | |
150 | ||
151 | case AF_INET: | |
1c4baffc | 152 | r = sd_netlink_message_read_in_addr(mm, IFA_LOCAL, &address.in); |
74b2466e | 153 | if (r < 0) { |
1c4baffc | 154 | r = sd_netlink_message_read_in_addr(mm, IFA_ADDRESS, &address.in); |
74b2466e LP |
155 | if (r < 0) |
156 | goto fail; | |
157 | } | |
158 | ||
159 | break; | |
160 | ||
161 | case AF_INET6: | |
1c4baffc | 162 | r = sd_netlink_message_read_in6_addr(mm, IFA_LOCAL, &address.in6); |
74b2466e | 163 | if (r < 0) { |
1c4baffc | 164 | r = sd_netlink_message_read_in6_addr(mm, IFA_ADDRESS, &address.in6); |
74b2466e LP |
165 | if (r < 0) |
166 | goto fail; | |
167 | } | |
168 | ||
169 | break; | |
170 | ||
171 | default: | |
172 | return 0; | |
173 | } | |
174 | ||
175 | a = link_find_address(l, family, &address); | |
176 | ||
177 | switch (type) { | |
178 | ||
179 | case RTM_NEWADDR: | |
180 | ||
181 | if (!a) { | |
182 | r = link_address_new(l, &a, family, &address); | |
183 | if (r < 0) | |
184 | return r; | |
185 | } | |
186 | ||
187 | r = link_address_update_rtnl(a, mm); | |
188 | if (r < 0) | |
189 | return r; | |
190 | ||
191 | break; | |
192 | ||
193 | case RTM_DELADDR: | |
3e044c49 | 194 | link_address_free(a); |
74b2466e LP |
195 | break; |
196 | } | |
197 | ||
198 | return 0; | |
199 | ||
200 | fail: | |
da927ba9 | 201 | log_warning_errno(r, "Failed to process RTNL address message: %m"); |
74b2466e LP |
202 | return 0; |
203 | } | |
204 | ||
74b2466e | 205 | static int manager_rtnl_listen(Manager *m) { |
4afd3348 | 206 | _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL; |
1c4baffc | 207 | sd_netlink_message *i; |
74b2466e LP |
208 | int r; |
209 | ||
210 | assert(m); | |
211 | ||
cc98b302 | 212 | /* First, subscribe to interfaces coming and going */ |
1c4baffc | 213 | r = sd_netlink_open(&m->rtnl); |
74b2466e LP |
214 | if (r < 0) |
215 | return r; | |
216 | ||
2d895038 | 217 | r = sd_netlink_attach_event(m->rtnl, m->event, SD_EVENT_PRIORITY_IMPORTANT); |
74b2466e LP |
218 | if (r < 0) |
219 | return r; | |
220 | ||
1c4baffc | 221 | r = sd_netlink_add_match(m->rtnl, RTM_NEWLINK, manager_process_link, m); |
74b2466e LP |
222 | if (r < 0) |
223 | return r; | |
224 | ||
1c4baffc | 225 | r = sd_netlink_add_match(m->rtnl, RTM_DELLINK, manager_process_link, m); |
74b2466e LP |
226 | if (r < 0) |
227 | return r; | |
228 | ||
1c4baffc | 229 | r = sd_netlink_add_match(m->rtnl, RTM_NEWADDR, manager_process_address, m); |
74b2466e LP |
230 | if (r < 0) |
231 | return r; | |
091a364c | 232 | |
1c4baffc | 233 | r = sd_netlink_add_match(m->rtnl, RTM_DELADDR, manager_process_address, m); |
74b2466e LP |
234 | if (r < 0) |
235 | return r; | |
236 | ||
237 | /* Then, enumerate all links */ | |
238 | r = sd_rtnl_message_new_link(m->rtnl, &req, RTM_GETLINK, 0); | |
239 | if (r < 0) | |
240 | return r; | |
241 | ||
1c4baffc | 242 | r = sd_netlink_message_request_dump(req, true); |
74b2466e LP |
243 | if (r < 0) |
244 | return r; | |
245 | ||
1c4baffc | 246 | r = sd_netlink_call(m->rtnl, req, 0, &reply); |
74b2466e LP |
247 | if (r < 0) |
248 | return r; | |
249 | ||
1c4baffc | 250 | for (i = reply; i; i = sd_netlink_message_next(i)) { |
74b2466e LP |
251 | r = manager_process_link(m->rtnl, i, m); |
252 | if (r < 0) | |
253 | return r; | |
254 | } | |
255 | ||
1c4baffc TG |
256 | req = sd_netlink_message_unref(req); |
257 | reply = sd_netlink_message_unref(reply); | |
74b2466e LP |
258 | |
259 | /* Finally, enumerate all addresses, too */ | |
260 | r = sd_rtnl_message_new_addr(m->rtnl, &req, RTM_GETADDR, 0, AF_UNSPEC); | |
261 | if (r < 0) | |
262 | return r; | |
263 | ||
1c4baffc | 264 | r = sd_netlink_message_request_dump(req, true); |
74b2466e LP |
265 | if (r < 0) |
266 | return r; | |
267 | ||
1c4baffc | 268 | r = sd_netlink_call(m->rtnl, req, 0, &reply); |
74b2466e LP |
269 | if (r < 0) |
270 | return r; | |
271 | ||
1c4baffc | 272 | for (i = reply; i; i = sd_netlink_message_next(i)) { |
74b2466e LP |
273 | r = manager_process_address(m->rtnl, i, m); |
274 | if (r < 0) | |
275 | return r; | |
276 | } | |
277 | ||
278 | return r; | |
279 | } | |
280 | ||
281 | static int on_network_event(sd_event_source *s, int fd, uint32_t revents, void *userdata) { | |
282 | Manager *m = userdata; | |
283 | Iterator i; | |
284 | Link *l; | |
285 | int r; | |
286 | ||
287 | assert(m); | |
288 | ||
289 | sd_network_monitor_flush(m->network_monitor); | |
290 | ||
291 | HASHMAP_FOREACH(l, m->links, i) { | |
943ef07c | 292 | r = link_update(l); |
74b2466e | 293 | if (r < 0) |
da927ba9 | 294 | log_warning_errno(r, "Failed to update monitor information for %i: %m", l->ifindex); |
74b2466e LP |
295 | } |
296 | ||
7207052d | 297 | (void) manager_write_resolv_conf(m); |
74b2466e LP |
298 | |
299 | return 0; | |
300 | } | |
301 | ||
302 | static int manager_network_monitor_listen(Manager *m) { | |
303 | int r, fd, events; | |
304 | ||
305 | assert(m); | |
306 | ||
0014a4ad | 307 | r = sd_network_monitor_new(&m->network_monitor, NULL); |
74b2466e LP |
308 | if (r < 0) |
309 | return r; | |
310 | ||
311 | fd = sd_network_monitor_get_fd(m->network_monitor); | |
312 | if (fd < 0) | |
313 | return fd; | |
314 | ||
315 | events = sd_network_monitor_get_events(m->network_monitor); | |
316 | if (events < 0) | |
317 | return events; | |
318 | ||
319 | r = sd_event_add_io(m->event, &m->network_event_source, fd, events, &on_network_event, m); | |
320 | if (r < 0) | |
2d895038 LP |
321 | return r; |
322 | ||
323 | r = sd_event_source_set_priority(m->network_event_source, SD_EVENT_PRIORITY_IMPORTANT+5); | |
324 | if (r < 0) | |
74b2466e LP |
325 | return r; |
326 | ||
aa4a9deb LP |
327 | (void) sd_event_source_set_description(m->network_event_source, "network-monitor"); |
328 | ||
74b2466e LP |
329 | return 0; |
330 | } | |
331 | ||
e96de0ce | 332 | static int determine_hostname(char **full_hostname, char **llmnr_hostname, char **mdns_hostname) { |
eb60f9cd | 333 | _cleanup_free_ char *h = NULL, *n = NULL; |
349cc4a5 | 334 | #if HAVE_LIBIDN2 |
87057e24 | 335 | _cleanup_free_ char *utf8 = NULL; |
349cc4a5 | 336 | #elif HAVE_LIBIDN |
87057e24 ZJS |
337 | int k; |
338 | #endif | |
78c6a153 | 339 | char label[DNS_LABEL_MAX]; |
87057e24 ZJS |
340 | const char *p, *decoded; |
341 | int r; | |
eb60f9cd | 342 | |
e96de0ce | 343 | assert(full_hostname); |
78c6a153 LP |
344 | assert(llmnr_hostname); |
345 | assert(mdns_hostname); | |
346 | ||
a25b0dc8 | 347 | /* Extract and normalize the first label of the locally configured hostname, and check it's not "localhost". */ |
eb60f9cd | 348 | |
a25b0dc8 LP |
349 | r = gethostname_strict(&h); |
350 | if (r < 0) | |
351 | return log_debug_errno(r, "Can't determine system hostname: %m"); | |
eb60f9cd | 352 | |
78c6a153 | 353 | p = h; |
87057e24 | 354 | r = dns_label_unescape(&p, label, sizeof label); |
78c6a153 LP |
355 | if (r < 0) |
356 | return log_error_errno(r, "Failed to unescape host name: %m"); | |
357 | if (r == 0) { | |
a25b0dc8 | 358 | log_error("Couldn't find a single label in hostname."); |
78c6a153 LP |
359 | return -EINVAL; |
360 | } | |
361 | ||
349cc4a5 | 362 | #if HAVE_LIBIDN2 |
87057e24 ZJS |
363 | r = idn2_to_unicode_8z8z(label, &utf8, 0); |
364 | if (r != IDN2_OK) | |
365 | return log_error("Failed to undo IDNA: %s", idn2_strerror(r)); | |
366 | assert(utf8_is_valid(utf8)); | |
367 | ||
368 | r = strlen(utf8); | |
369 | decoded = utf8; | |
349cc4a5 | 370 | #elif HAVE_LIBIDN |
87057e24 | 371 | k = dns_label_undo_idna(label, r, label, sizeof label); |
78c6a153 LP |
372 | if (k < 0) |
373 | return log_error_errno(k, "Failed to undo IDNA: %m"); | |
374 | if (k > 0) | |
375 | r = k; | |
376 | ||
377 | if (!utf8_is_valid(label)) { | |
eb60f9cd LP |
378 | log_error("System hostname is not UTF-8 clean."); |
379 | return -EINVAL; | |
380 | } | |
87057e24 ZJS |
381 | decoded = label; |
382 | #else | |
383 | decoded = label; /* no decoding */ | |
384 | #endif | |
eb60f9cd | 385 | |
87057e24 | 386 | r = dns_label_escape_new(decoded, r, &n); |
78c6a153 LP |
387 | if (r < 0) |
388 | return log_error_errno(r, "Failed to escape host name: %m"); | |
389 | ||
390 | if (is_localhost(n)) { | |
391 | log_debug("System hostname is 'localhost', ignoring."); | |
392 | return -EINVAL; | |
eb60f9cd LP |
393 | } |
394 | ||
78c6a153 LP |
395 | r = dns_name_concat(n, "local", mdns_hostname); |
396 | if (r < 0) | |
397 | return log_error_errno(r, "Failed to determine mDNS hostname: %m"); | |
398 | ||
ae2a15bc LP |
399 | *llmnr_hostname = TAKE_PTR(n); |
400 | *full_hostname = TAKE_PTR(h); | |
e96de0ce | 401 | |
eb60f9cd LP |
402 | return 0; |
403 | } | |
404 | ||
a25b0dc8 LP |
405 | static const char *fallback_hostname(void) { |
406 | ||
407 | /* Determine the fall back hostname. For exposing this system to the outside world, we cannot have it to be | |
408 | * "localhost" even if that's the compiled in hostname. In this case, let's revert to "linux" instead. */ | |
409 | ||
410 | if (is_localhost(FALLBACK_HOSTNAME)) | |
411 | return "linux"; | |
412 | ||
413 | return FALLBACK_HOSTNAME; | |
414 | } | |
415 | ||
416 | static int make_fallback_hostnames(char **full_hostname, char **llmnr_hostname, char **mdns_hostname) { | |
417 | _cleanup_free_ char *n = NULL, *m = NULL; | |
418 | char label[DNS_LABEL_MAX], *h; | |
419 | const char *p; | |
420 | int r; | |
421 | ||
422 | assert(full_hostname); | |
423 | assert(llmnr_hostname); | |
424 | assert(mdns_hostname); | |
425 | ||
426 | p = fallback_hostname(); | |
427 | r = dns_label_unescape(&p, label, sizeof(label)); | |
428 | if (r < 0) | |
429 | return log_error_errno(r, "Failed to unescape fallback host name: %m"); | |
430 | ||
431 | assert(r > 0); /* The fallback hostname must have at least one label */ | |
432 | ||
433 | r = dns_label_escape_new(label, r, &n); | |
434 | if (r < 0) | |
435 | return log_error_errno(r, "Failed to escape fallback hostname: %m"); | |
436 | ||
437 | r = dns_name_concat(n, "local", &m); | |
438 | if (r < 0) | |
439 | return log_error_errno(r, "Failed to concatenate mDNS hostname: %m"); | |
440 | ||
441 | h = strdup(fallback_hostname()); | |
442 | if (!h) | |
443 | return log_oom(); | |
444 | ||
ae2a15bc LP |
445 | *llmnr_hostname = TAKE_PTR(n); |
446 | *mdns_hostname = TAKE_PTR(m); | |
a25b0dc8 LP |
447 | |
448 | *full_hostname = h; | |
449 | ||
450 | return 0; | |
451 | } | |
452 | ||
eb60f9cd | 453 | static int on_hostname_change(sd_event_source *es, int fd, uint32_t revents, void *userdata) { |
e96de0ce | 454 | _cleanup_free_ char *full_hostname = NULL, *llmnr_hostname = NULL, *mdns_hostname = NULL; |
eb60f9cd LP |
455 | Manager *m = userdata; |
456 | int r; | |
457 | ||
458 | assert(m); | |
459 | ||
e96de0ce | 460 | r = determine_hostname(&full_hostname, &llmnr_hostname, &mdns_hostname); |
eb60f9cd LP |
461 | if (r < 0) |
462 | return 0; /* ignore invalid hostnames */ | |
463 | ||
e96de0ce LP |
464 | if (streq(full_hostname, m->full_hostname) && |
465 | streq(llmnr_hostname, m->llmnr_hostname) && | |
466 | streq(mdns_hostname, m->mdns_hostname)) | |
eb60f9cd LP |
467 | return 0; |
468 | ||
e96de0ce | 469 | log_info("System hostname changed to '%s'.", full_hostname); |
78c6a153 | 470 | |
e96de0ce LP |
471 | free_and_replace(m->full_hostname, full_hostname); |
472 | free_and_replace(m->llmnr_hostname, llmnr_hostname); | |
473 | free_and_replace(m->mdns_hostname, mdns_hostname); | |
eb60f9cd LP |
474 | |
475 | manager_refresh_rrs(m); | |
476 | ||
477 | return 0; | |
478 | } | |
479 | ||
480 | static int manager_watch_hostname(Manager *m) { | |
eb60f9cd LP |
481 | int r; |
482 | ||
483 | assert(m); | |
484 | ||
db4a47e9 LP |
485 | m->hostname_fd = open("/proc/sys/kernel/hostname", |
486 | O_RDONLY|O_CLOEXEC|O_NONBLOCK|O_NOCTTY); | |
eb60f9cd | 487 | if (m->hostname_fd < 0) { |
56f64d95 | 488 | log_warning_errno(errno, "Failed to watch hostname: %m"); |
eb60f9cd LP |
489 | return 0; |
490 | } | |
491 | ||
492 | r = sd_event_add_io(m->event, &m->hostname_event_source, m->hostname_fd, 0, on_hostname_change, m); | |
493 | if (r < 0) { | |
494 | if (r == -EPERM) | |
495 | /* kernels prior to 3.2 don't support polling this file. Ignore the failure. */ | |
496 | m->hostname_fd = safe_close(m->hostname_fd); | |
8d3d7072 MS |
497 | else |
498 | return log_error_errno(r, "Failed to add hostname event source: %m"); | |
eb60f9cd LP |
499 | } |
500 | ||
aa4a9deb LP |
501 | (void) sd_event_source_set_description(m->hostname_event_source, "hostname"); |
502 | ||
e96de0ce | 503 | r = determine_hostname(&m->full_hostname, &m->llmnr_hostname, &m->mdns_hostname); |
eb60f9cd | 504 | if (r < 0) { |
a25b0dc8 | 505 | log_info("Defaulting to hostname '%s'.", fallback_hostname()); |
78c6a153 | 506 | |
a25b0dc8 LP |
507 | r = make_fallback_hostnames(&m->full_hostname, &m->llmnr_hostname, &m->mdns_hostname); |
508 | if (r < 0) | |
509 | return r; | |
eb60f9cd | 510 | } else |
e96de0ce | 511 | log_info("Using system hostname '%s'.", m->full_hostname); |
eb60f9cd LP |
512 | |
513 | return 0; | |
514 | } | |
515 | ||
4d506d6b LP |
516 | static int manager_sigusr1(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { |
517 | _cleanup_free_ char *buffer = NULL; | |
518 | _cleanup_fclose_ FILE *f = NULL; | |
519 | Manager *m = userdata; | |
cf84484a | 520 | DnsServer *server; |
4d506d6b LP |
521 | size_t size = 0; |
522 | DnsScope *scope; | |
cf84484a LP |
523 | Iterator i; |
524 | Link *l; | |
4d506d6b LP |
525 | |
526 | assert(s); | |
527 | assert(si); | |
528 | assert(m); | |
529 | ||
530 | f = open_memstream(&buffer, &size); | |
531 | if (!f) | |
532 | return log_oom(); | |
533 | ||
0d536673 LP |
534 | (void) __fsetlocking(f, FSETLOCKING_BYCALLER); |
535 | ||
4d506d6b LP |
536 | LIST_FOREACH(scopes, scope, m->dns_scopes) |
537 | dns_scope_dump(scope, f); | |
538 | ||
cf84484a LP |
539 | LIST_FOREACH(servers, server, m->dns_servers) |
540 | dns_server_dump(server, f); | |
541 | LIST_FOREACH(servers, server, m->fallback_dns_servers) | |
542 | dns_server_dump(server, f); | |
543 | HASHMAP_FOREACH(l, m->links, i) | |
544 | LIST_FOREACH(servers, server, l->dns_servers) | |
545 | dns_server_dump(server, f); | |
546 | ||
4d506d6b LP |
547 | if (fflush_and_check(f) < 0) |
548 | return log_oom(); | |
549 | ||
550 | log_dump(LOG_INFO, buffer); | |
551 | return 0; | |
552 | } | |
553 | ||
bc81447e LP |
554 | static int manager_sigusr2(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { |
555 | Manager *m = userdata; | |
bc81447e LP |
556 | |
557 | assert(s); | |
558 | assert(si); | |
559 | assert(m); | |
560 | ||
ba35662f | 561 | manager_flush_caches(m); |
ba35662f | 562 | |
bc81447e LP |
563 | return 0; |
564 | } | |
565 | ||
d55b0463 LP |
566 | static int manager_sigrtmin1(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { |
567 | Manager *m = userdata; | |
568 | ||
569 | assert(s); | |
570 | assert(si); | |
571 | assert(m); | |
572 | ||
573 | manager_reset_server_features(m); | |
574 | return 0; | |
575 | } | |
576 | ||
091a364c | 577 | int manager_new(Manager **ret) { |
74b2466e | 578 | _cleanup_(manager_freep) Manager *m = NULL; |
091a364c TG |
579 | int r; |
580 | ||
c92e531c LP |
581 | assert(ret); |
582 | ||
091a364c TG |
583 | m = new0(Manager, 1); |
584 | if (!m) | |
585 | return -ENOMEM; | |
586 | ||
1716f6dc | 587 | m->llmnr_ipv4_udp_fd = m->llmnr_ipv6_udp_fd = -1; |
623a4c97 | 588 | m->llmnr_ipv4_tcp_fd = m->llmnr_ipv6_tcp_fd = -1; |
bc7702b0 | 589 | m->mdns_ipv4_fd = m->mdns_ipv6_fd = -1; |
b30bf55d | 590 | m->dns_stub_udp_fd = m->dns_stub_tcp_fd = -1; |
eb60f9cd | 591 | m->hostname_fd = -1; |
1716f6dc | 592 | |
af49ca27 | 593 | m->llmnr_support = RESOLVE_SUPPORT_YES; |
7bef8e8e | 594 | m->mdns_support = RESOLVE_SUPPORT_YES; |
61ecb465 | 595 | m->dnssec_mode = DEFAULT_DNSSEC_MODE; |
ceeddf79 | 596 | m->enable_cache = true; |
1ae43295 | 597 | m->dns_stub_listener_mode = DNS_STUB_LISTENER_UDP; |
5cb36f41 | 598 | m->read_resolv_conf = true; |
00fa60ae | 599 | m->need_builtin_fallbacks = true; |
dd0bc0f1 | 600 | m->etc_hosts_last = m->etc_hosts_mtime = USEC_INFINITY; |
091a364c | 601 | |
0d2cd476 LP |
602 | r = dns_trust_anchor_load(&m->trust_anchor); |
603 | if (r < 0) | |
604 | return r; | |
605 | ||
ad6c0475 LP |
606 | r = manager_parse_config_file(m); |
607 | if (r < 0) | |
5ce497b5 | 608 | log_warning_errno(r, "Failed to parse configuration file: %m"); |
ad6c0475 | 609 | |
091a364c TG |
610 | r = sd_event_default(&m->event); |
611 | if (r < 0) | |
612 | return r; | |
613 | ||
614 | sd_event_add_signal(m->event, NULL, SIGTERM, NULL, NULL); | |
615 | sd_event_add_signal(m->event, NULL, SIGINT, NULL, NULL); | |
616 | ||
617 | sd_event_set_watchdog(m->event, true); | |
618 | ||
eb60f9cd LP |
619 | r = manager_watch_hostname(m); |
620 | if (r < 0) | |
621 | return r; | |
622 | ||
6501dd31 DR |
623 | r = dnssd_load(m); |
624 | if (r < 0) | |
625 | log_warning_errno(r, "Failed to load DNS-SD configuration files: %m"); | |
626 | ||
1716f6dc | 627 | r = dns_scope_new(m, &m->unicast_scope, NULL, DNS_PROTOCOL_DNS, AF_UNSPEC); |
74b2466e LP |
628 | if (r < 0) |
629 | return r; | |
630 | ||
631 | r = manager_network_monitor_listen(m); | |
632 | if (r < 0) | |
633 | return r; | |
634 | ||
635 | r = manager_rtnl_listen(m); | |
636 | if (r < 0) | |
637 | return r; | |
638 | ||
639 | r = manager_connect_bus(m); | |
640 | if (r < 0) | |
641 | return r; | |
642 | ||
4d506d6b | 643 | (void) sd_event_add_signal(m->event, &m->sigusr1_event_source, SIGUSR1, manager_sigusr1, m); |
bc81447e | 644 | (void) sd_event_add_signal(m->event, &m->sigusr2_event_source, SIGUSR2, manager_sigusr2, m); |
d55b0463 | 645 | (void) sd_event_add_signal(m->event, &m->sigrtmin1_event_source, SIGRTMIN+1, manager_sigrtmin1, m); |
4d506d6b | 646 | |
943ef07c LP |
647 | manager_cleanup_saved_user(m); |
648 | ||
091a364c TG |
649 | *ret = m; |
650 | m = NULL; | |
651 | ||
652 | return 0; | |
653 | } | |
654 | ||
edc501d4 LP |
655 | int manager_start(Manager *m) { |
656 | int r; | |
657 | ||
658 | assert(m); | |
659 | ||
b30bf55d LP |
660 | r = manager_dns_stub_start(m); |
661 | if (r < 0) | |
662 | return r; | |
663 | ||
edc501d4 LP |
664 | return 0; |
665 | } | |
666 | ||
74b2466e LP |
667 | Manager *manager_free(Manager *m) { |
668 | Link *l; | |
6501dd31 | 669 | DnssdService *s; |
091a364c TG |
670 | |
671 | if (!m) | |
74b2466e LP |
672 | return NULL; |
673 | ||
4b95f179 LP |
674 | dns_server_unlink_all(m->dns_servers); |
675 | dns_server_unlink_all(m->fallback_dns_servers); | |
a51c1048 LP |
676 | dns_search_domain_unlink_all(m->search_domains); |
677 | ||
74b2466e LP |
678 | while ((l = hashmap_first(m->links))) |
679 | link_free(l); | |
f0e15467 LP |
680 | |
681 | while (m->dns_queries) | |
682 | dns_query_free(m->dns_queries); | |
74b2466e | 683 | |
cab5b059 LP |
684 | dns_scope_free(m->unicast_scope); |
685 | ||
b30bf55d LP |
686 | /* At this point only orphaned streams should remain. All others should have been freed already by their |
687 | * owners */ | |
688 | while (m->dns_streams) | |
689 | dns_stream_unref(m->dns_streams); | |
690 | ||
f0e15467 LP |
691 | hashmap_free(m->links); |
692 | hashmap_free(m->dns_transactions); | |
693 | ||
096b6773 LP |
694 | sd_event_source_unref(m->network_event_source); |
695 | sd_network_monitor_unref(m->network_monitor); | |
091a364c | 696 | |
a564ca2f LP |
697 | sd_netlink_unref(m->rtnl); |
698 | sd_event_source_unref(m->rtnl_event_source); | |
699 | ||
edc501d4 | 700 | manager_llmnr_stop(m); |
bc7702b0 | 701 | manager_mdns_stop(m); |
b30bf55d | 702 | manager_dns_stub_stop(m); |
623a4c97 | 703 | |
902bb5d8 | 704 | sd_bus_slot_unref(m->prepare_for_sleep_slot); |
74b2466e LP |
705 | sd_event_source_unref(m->bus_retry_event_source); |
706 | sd_bus_unref(m->bus); | |
091a364c | 707 | |
4d506d6b | 708 | sd_event_source_unref(m->sigusr1_event_source); |
bc81447e | 709 | sd_event_source_unref(m->sigusr2_event_source); |
d55b0463 | 710 | sd_event_source_unref(m->sigrtmin1_event_source); |
4d506d6b | 711 | |
74b2466e | 712 | sd_event_unref(m->event); |
623a4c97 | 713 | |
78c6a153 LP |
714 | dns_resource_key_unref(m->llmnr_host_ipv4_key); |
715 | dns_resource_key_unref(m->llmnr_host_ipv6_key); | |
400cb36e DR |
716 | dns_resource_key_unref(m->mdns_host_ipv4_key); |
717 | dns_resource_key_unref(m->mdns_host_ipv6_key); | |
eb60f9cd | 718 | |
eb60f9cd | 719 | sd_event_source_unref(m->hostname_event_source); |
d9fcf2ba | 720 | safe_close(m->hostname_fd); |
e96de0ce LP |
721 | |
722 | free(m->full_hostname); | |
78c6a153 LP |
723 | free(m->llmnr_hostname); |
724 | free(m->mdns_hostname); | |
eb60f9cd | 725 | |
6501dd31 DR |
726 | while ((s = hashmap_first(m->dnssd_services))) |
727 | dnssd_service_free(s); | |
728 | hashmap_free(m->dnssd_services); | |
729 | ||
0d2cd476 | 730 | dns_trust_anchor_flush(&m->trust_anchor); |
dd0bc0f1 | 731 | manager_etc_hosts_flush(m); |
0d2cd476 | 732 | |
6b430fdb | 733 | return mfree(m); |
091a364c TG |
734 | } |
735 | ||
1716f6dc | 736 | int manager_recv(Manager *m, int fd, DnsProtocol protocol, DnsPacket **ret) { |
74b2466e | 737 | _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL; |
1716f6dc LP |
738 | union { |
739 | struct cmsghdr header; /* For alignment */ | |
40a1eebd | 740 | uint8_t buffer[CMSG_SPACE(MAXSIZE(struct in_pktinfo, struct in6_pktinfo)) |
1716f6dc | 741 | + CMSG_SPACE(int) /* ttl/hoplimit */ |
623a4c97 | 742 | + EXTRA_CMSG_SPACE /* kernel appears to require extra buffer space */]; |
1716f6dc LP |
743 | } control; |
744 | union sockaddr_union sa; | |
74b2466e | 745 | struct msghdr mh = {}; |
1716f6dc | 746 | struct cmsghdr *cmsg; |
74b2466e | 747 | struct iovec iov; |
4edc2c9b LP |
748 | ssize_t ms, l; |
749 | int r; | |
74b2466e LP |
750 | |
751 | assert(m); | |
1716f6dc | 752 | assert(fd >= 0); |
74b2466e LP |
753 | assert(ret); |
754 | ||
4edc2c9b | 755 | ms = next_datagram_size_fd(fd); |
74b2466e | 756 | if (ms < 0) |
4edc2c9b | 757 | return ms; |
74b2466e | 758 | |
51027656 | 759 | r = dns_packet_new(&p, protocol, ms, DNS_PACKET_SIZE_MAX); |
74b2466e LP |
760 | if (r < 0) |
761 | return r; | |
762 | ||
763 | iov.iov_base = DNS_PACKET_DATA(p); | |
764 | iov.iov_len = p->allocated; | |
765 | ||
1716f6dc LP |
766 | mh.msg_name = &sa.sa; |
767 | mh.msg_namelen = sizeof(sa); | |
74b2466e LP |
768 | mh.msg_iov = &iov; |
769 | mh.msg_iovlen = 1; | |
1716f6dc LP |
770 | mh.msg_control = &control; |
771 | mh.msg_controllen = sizeof(control); | |
74b2466e | 772 | |
a38d9945 | 773 | l = recvmsg(fd, &mh, 0); |
f134289a EV |
774 | if (l == 0) |
775 | return 0; | |
74b2466e | 776 | if (l < 0) { |
4c701096 | 777 | if (IN_SET(errno, EAGAIN, EINTR)) |
74b2466e LP |
778 | return 0; |
779 | ||
780 | return -errno; | |
091a364c TG |
781 | } |
782 | ||
1716f6dc LP |
783 | assert(!(mh.msg_flags & MSG_CTRUNC)); |
784 | assert(!(mh.msg_flags & MSG_TRUNC)); | |
785 | ||
74b2466e | 786 | p->size = (size_t) l; |
091a364c | 787 | |
1716f6dc | 788 | p->family = sa.sa.sa_family; |
623a4c97 LP |
789 | p->ipproto = IPPROTO_UDP; |
790 | if (p->family == AF_INET) { | |
1716f6dc | 791 | p->sender.in = sa.in.sin_addr; |
623a4c97 LP |
792 | p->sender_port = be16toh(sa.in.sin_port); |
793 | } else if (p->family == AF_INET6) { | |
1716f6dc | 794 | p->sender.in6 = sa.in6.sin6_addr; |
623a4c97 LP |
795 | p->sender_port = be16toh(sa.in6.sin6_port); |
796 | p->ifindex = sa.in6.sin6_scope_id; | |
797 | } else | |
1716f6dc | 798 | return -EAFNOSUPPORT; |
74b2466e | 799 | |
2a1288ff | 800 | CMSG_FOREACH(cmsg, &mh) { |
74b2466e | 801 | |
1716f6dc LP |
802 | if (cmsg->cmsg_level == IPPROTO_IPV6) { |
803 | assert(p->family == AF_INET6); | |
74b2466e | 804 | |
1716f6dc | 805 | switch (cmsg->cmsg_type) { |
74b2466e | 806 | |
1716f6dc LP |
807 | case IPV6_PKTINFO: { |
808 | struct in6_pktinfo *i = (struct in6_pktinfo*) CMSG_DATA(cmsg); | |
74b2466e | 809 | |
623a4c97 LP |
810 | if (p->ifindex <= 0) |
811 | p->ifindex = i->ipi6_ifindex; | |
812 | ||
1716f6dc LP |
813 | p->destination.in6 = i->ipi6_addr; |
814 | break; | |
815 | } | |
74b2466e | 816 | |
1716f6dc LP |
817 | case IPV6_HOPLIMIT: |
818 | p->ttl = *(int *) CMSG_DATA(cmsg); | |
819 | break; | |
74b2466e | 820 | |
1716f6dc LP |
821 | } |
822 | } else if (cmsg->cmsg_level == IPPROTO_IP) { | |
823 | assert(p->family == AF_INET); | |
74b2466e | 824 | |
1716f6dc | 825 | switch (cmsg->cmsg_type) { |
74b2466e | 826 | |
1716f6dc LP |
827 | case IP_PKTINFO: { |
828 | struct in_pktinfo *i = (struct in_pktinfo*) CMSG_DATA(cmsg); | |
091a364c | 829 | |
623a4c97 LP |
830 | if (p->ifindex <= 0) |
831 | p->ifindex = i->ipi_ifindex; | |
832 | ||
1716f6dc LP |
833 | p->destination.in = i->ipi_addr; |
834 | break; | |
835 | } | |
74b2466e | 836 | |
623a4c97 | 837 | case IP_TTL: |
1716f6dc LP |
838 | p->ttl = *(int *) CMSG_DATA(cmsg); |
839 | break; | |
840 | } | |
841 | } | |
842 | } | |
74b2466e | 843 | |
623a4c97 LP |
844 | /* The Linux kernel sets the interface index to the loopback |
845 | * device if the packet came from the local host since it | |
846 | * avoids the routing table in such a case. Let's unset the | |
847 | * interface index in such a case. */ | |
a5f03596 | 848 | if (p->ifindex == LOOPBACK_IFINDEX) |
623a4c97 LP |
849 | p->ifindex = 0; |
850 | ||
86ad4cd7 TG |
851 | if (protocol != DNS_PROTOCOL_DNS) { |
852 | /* If we don't know the interface index still, we look for the | |
853 | * first local interface with a matching address. Yuck! */ | |
854 | if (p->ifindex <= 0) | |
855 | p->ifindex = manager_find_ifindex(m, p->family, &p->destination); | |
856 | } | |
623a4c97 | 857 | |
74b2466e LP |
858 | *ret = p; |
859 | p = NULL; | |
860 | ||
861 | return 1; | |
862 | } | |
863 | ||
74b2466e LP |
864 | static int sendmsg_loop(int fd, struct msghdr *mh, int flags) { |
865 | int r; | |
866 | ||
867 | assert(fd >= 0); | |
868 | assert(mh); | |
869 | ||
870 | for (;;) { | |
871 | if (sendmsg(fd, mh, flags) >= 0) | |
872 | return 0; | |
873 | ||
874 | if (errno == EINTR) | |
875 | continue; | |
876 | ||
877 | if (errno != EAGAIN) | |
878 | return -errno; | |
879 | ||
880 | r = fd_wait_for_event(fd, POLLOUT, SEND_TIMEOUT_USEC); | |
881 | if (r < 0) | |
882 | return r; | |
883 | if (r == 0) | |
884 | return -ETIMEDOUT; | |
885 | } | |
886 | } | |
887 | ||
72290734 TG |
888 | static int write_loop(int fd, void *message, size_t length) { |
889 | int r; | |
890 | ||
891 | assert(fd >= 0); | |
892 | assert(message); | |
893 | ||
894 | for (;;) { | |
895 | if (write(fd, message, length) >= 0) | |
896 | return 0; | |
897 | ||
898 | if (errno == EINTR) | |
899 | continue; | |
900 | ||
901 | if (errno != EAGAIN) | |
902 | return -errno; | |
903 | ||
904 | r = fd_wait_for_event(fd, POLLOUT, SEND_TIMEOUT_USEC); | |
905 | if (r < 0) | |
906 | return r; | |
907 | if (r == 0) | |
908 | return -ETIMEDOUT; | |
909 | } | |
910 | } | |
911 | ||
912 | int manager_write(Manager *m, int fd, DnsPacket *p) { | |
913 | int r; | |
914 | ||
deb3f3d3 | 915 | log_debug("Sending %s packet with id %" PRIu16 ".", DNS_PACKET_QR(p) ? "response" : "query", DNS_PACKET_ID(p)); |
72290734 TG |
916 | |
917 | r = write_loop(fd, DNS_PACKET_DATA(p), p->size); | |
918 | if (r < 0) | |
919 | return r; | |
920 | ||
921 | return 0; | |
922 | } | |
923 | ||
b30bf55d LP |
924 | static int manager_ipv4_send( |
925 | Manager *m, | |
926 | int fd, | |
927 | int ifindex, | |
928 | const struct in_addr *destination, | |
929 | uint16_t port, | |
930 | const struct in_addr *source, | |
931 | DnsPacket *p) { | |
74b2466e LP |
932 | union sockaddr_union sa = { |
933 | .in.sin_family = AF_INET, | |
74b2466e | 934 | }; |
1716f6dc LP |
935 | union { |
936 | struct cmsghdr header; /* For alignment */ | |
937 | uint8_t buffer[CMSG_SPACE(sizeof(struct in_pktinfo))]; | |
938 | } control; | |
74b2466e LP |
939 | struct msghdr mh = {}; |
940 | struct iovec iov; | |
74b2466e LP |
941 | |
942 | assert(m); | |
1716f6dc | 943 | assert(fd >= 0); |
b30bf55d | 944 | assert(destination); |
1716f6dc | 945 | assert(port > 0); |
74b2466e LP |
946 | assert(p); |
947 | ||
74b2466e LP |
948 | iov.iov_base = DNS_PACKET_DATA(p); |
949 | iov.iov_len = p->size; | |
091a364c | 950 | |
b30bf55d | 951 | sa.in.sin_addr = *destination; |
1716f6dc | 952 | sa.in.sin_port = htobe16(port), |
091a364c | 953 | |
74b2466e LP |
954 | mh.msg_iov = &iov; |
955 | mh.msg_iovlen = 1; | |
956 | mh.msg_name = &sa.sa; | |
957 | mh.msg_namelen = sizeof(sa.in); | |
091a364c | 958 | |
74b2466e LP |
959 | if (ifindex > 0) { |
960 | struct cmsghdr *cmsg; | |
961 | struct in_pktinfo *pi; | |
962 | ||
963 | zero(control); | |
964 | ||
1716f6dc | 965 | mh.msg_control = &control; |
74b2466e LP |
966 | mh.msg_controllen = CMSG_LEN(sizeof(struct in_pktinfo)); |
967 | ||
968 | cmsg = CMSG_FIRSTHDR(&mh); | |
969 | cmsg->cmsg_len = mh.msg_controllen; | |
970 | cmsg->cmsg_level = IPPROTO_IP; | |
971 | cmsg->cmsg_type = IP_PKTINFO; | |
972 | ||
973 | pi = (struct in_pktinfo*) CMSG_DATA(cmsg); | |
974 | pi->ipi_ifindex = ifindex; | |
b30bf55d LP |
975 | |
976 | if (source) | |
977 | pi->ipi_spec_dst = *source; | |
74b2466e LP |
978 | } |
979 | ||
980 | return sendmsg_loop(fd, &mh, 0); | |
981 | } | |
982 | ||
b30bf55d LP |
983 | static int manager_ipv6_send( |
984 | Manager *m, | |
985 | int fd, | |
986 | int ifindex, | |
987 | const struct in6_addr *destination, | |
988 | uint16_t port, | |
989 | const struct in6_addr *source, | |
990 | DnsPacket *p) { | |
991 | ||
74b2466e LP |
992 | union sockaddr_union sa = { |
993 | .in6.sin6_family = AF_INET6, | |
74b2466e | 994 | }; |
1716f6dc LP |
995 | union { |
996 | struct cmsghdr header; /* For alignment */ | |
997 | uint8_t buffer[CMSG_SPACE(sizeof(struct in6_pktinfo))]; | |
998 | } control; | |
74b2466e LP |
999 | struct msghdr mh = {}; |
1000 | struct iovec iov; | |
74b2466e LP |
1001 | |
1002 | assert(m); | |
1716f6dc | 1003 | assert(fd >= 0); |
b30bf55d | 1004 | assert(destination); |
1716f6dc | 1005 | assert(port > 0); |
74b2466e LP |
1006 | assert(p); |
1007 | ||
74b2466e LP |
1008 | iov.iov_base = DNS_PACKET_DATA(p); |
1009 | iov.iov_len = p->size; | |
1010 | ||
b30bf55d | 1011 | sa.in6.sin6_addr = *destination; |
1716f6dc | 1012 | sa.in6.sin6_port = htobe16(port), |
74b2466e LP |
1013 | sa.in6.sin6_scope_id = ifindex; |
1014 | ||
1015 | mh.msg_iov = &iov; | |
1016 | mh.msg_iovlen = 1; | |
1017 | mh.msg_name = &sa.sa; | |
1018 | mh.msg_namelen = sizeof(sa.in6); | |
1019 | ||
1020 | if (ifindex > 0) { | |
1021 | struct cmsghdr *cmsg; | |
1022 | struct in6_pktinfo *pi; | |
1023 | ||
1024 | zero(control); | |
1025 | ||
1716f6dc | 1026 | mh.msg_control = &control; |
74b2466e LP |
1027 | mh.msg_controllen = CMSG_LEN(sizeof(struct in6_pktinfo)); |
1028 | ||
1029 | cmsg = CMSG_FIRSTHDR(&mh); | |
1030 | cmsg->cmsg_len = mh.msg_controllen; | |
1031 | cmsg->cmsg_level = IPPROTO_IPV6; | |
1032 | cmsg->cmsg_type = IPV6_PKTINFO; | |
1033 | ||
1034 | pi = (struct in6_pktinfo*) CMSG_DATA(cmsg); | |
1035 | pi->ipi6_ifindex = ifindex; | |
b30bf55d LP |
1036 | |
1037 | if (source) | |
1038 | pi->ipi6_addr = *source; | |
74b2466e LP |
1039 | } |
1040 | ||
1041 | return sendmsg_loop(fd, &mh, 0); | |
1042 | } | |
1043 | ||
b30bf55d LP |
1044 | int manager_send( |
1045 | Manager *m, | |
1046 | int fd, | |
1047 | int ifindex, | |
1048 | int family, | |
1049 | const union in_addr_union *destination, | |
1050 | uint16_t port, | |
1051 | const union in_addr_union *source, | |
1052 | DnsPacket *p) { | |
1053 | ||
1716f6dc LP |
1054 | assert(m); |
1055 | assert(fd >= 0); | |
b30bf55d | 1056 | assert(destination); |
1716f6dc LP |
1057 | assert(port > 0); |
1058 | assert(p); | |
1059 | ||
deb3f3d3 | 1060 | 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 | 1061 | |
1716f6dc | 1062 | if (family == AF_INET) |
b30bf55d | 1063 | return manager_ipv4_send(m, fd, ifindex, &destination->in, port, &source->in, p); |
2817157b | 1064 | if (family == AF_INET6) |
b30bf55d | 1065 | return manager_ipv6_send(m, fd, ifindex, &destination->in6, port, &source->in6, p); |
1716f6dc LP |
1066 | |
1067 | return -EAFNOSUPPORT; | |
1068 | } | |
1069 | ||
e1c95994 LP |
1070 | uint32_t manager_find_mtu(Manager *m) { |
1071 | uint32_t mtu = 0; | |
1072 | Link *l; | |
1073 | Iterator i; | |
1074 | ||
1075 | /* If we don't know on which link a DNS packet would be | |
1076 | * delivered, let's find the largest MTU that works on all | |
1077 | * interfaces we know of */ | |
1078 | ||
1079 | HASHMAP_FOREACH(l, m->links, i) { | |
1080 | if (l->mtu <= 0) | |
1081 | continue; | |
1082 | ||
1083 | if (mtu <= 0 || l->mtu < mtu) | |
1084 | mtu = l->mtu; | |
1085 | } | |
1086 | ||
1087 | return mtu; | |
1088 | } | |
1716f6dc | 1089 | |
623a4c97 | 1090 | int manager_find_ifindex(Manager *m, int family, const union in_addr_union *in_addr) { |
ec2c5e43 LP |
1091 | LinkAddress *a; |
1092 | ||
1093 | assert(m); | |
1094 | ||
4e945a6f | 1095 | a = manager_find_link_address(m, family, in_addr); |
ec2c5e43 LP |
1096 | if (a) |
1097 | return a->link->ifindex; | |
1098 | ||
1099 | return 0; | |
1100 | } | |
1101 | ||
eb60f9cd LP |
1102 | void manager_refresh_rrs(Manager *m) { |
1103 | Iterator i; | |
1104 | Link *l; | |
6db6a464 | 1105 | DnssdService *s; |
eb60f9cd LP |
1106 | |
1107 | assert(m); | |
1108 | ||
78c6a153 LP |
1109 | m->llmnr_host_ipv4_key = dns_resource_key_unref(m->llmnr_host_ipv4_key); |
1110 | m->llmnr_host_ipv6_key = dns_resource_key_unref(m->llmnr_host_ipv6_key); | |
400cb36e DR |
1111 | m->mdns_host_ipv4_key = dns_resource_key_unref(m->mdns_host_ipv4_key); |
1112 | m->mdns_host_ipv6_key = dns_resource_key_unref(m->mdns_host_ipv6_key); | |
eb60f9cd | 1113 | |
6db6a464 DR |
1114 | if (m->mdns_support == RESOLVE_SUPPORT_YES) |
1115 | HASHMAP_FOREACH(s, m->dnssd_services, i) | |
1116 | if (dnssd_update_rrs(s) < 0) | |
1117 | log_warning("Failed to refresh DNS-SD service '%s'", s->name); | |
1118 | ||
eb60f9cd LP |
1119 | HASHMAP_FOREACH(l, m->links, i) { |
1120 | link_add_rrs(l, true); | |
1121 | link_add_rrs(l, false); | |
1122 | } | |
1123 | } | |
1124 | ||
e7c1b0e4 | 1125 | static int manager_next_random_name(const char *old, char **ret_new) { |
ec2c5e43 | 1126 | const char *p; |
556a2294 | 1127 | uint64_t u, a; |
e7c1b0e4 | 1128 | char *n; |
623a4c97 | 1129 | |
e7c1b0e4 | 1130 | p = strchr(old, 0); |
ec2c5e43 LP |
1131 | assert(p); |
1132 | ||
e7c1b0e4 DR |
1133 | while (p > old) { |
1134 | if (!strchr(DIGITS, p[-1])) | |
ec2c5e43 LP |
1135 | break; |
1136 | ||
1137 | p--; | |
1138 | } | |
1139 | ||
1140 | if (*p == 0 || safe_atou64(p, &u) < 0 || u <= 0) | |
1141 | u = 1; | |
1142 | ||
556a2294 LP |
1143 | /* Add a random number to the old value. This way we can avoid |
1144 | * that two hosts pick the same hostname, win on IPv4 and lose | |
1145 | * on IPv6 (or vice versa), and pick the same hostname | |
1146 | * replacement hostname, ad infinitum. We still want the | |
1147 | * numbers to go up monotonically, hence we just add a random | |
1148 | * value 1..10 */ | |
1149 | ||
1150 | random_bytes(&a, sizeof(a)); | |
1151 | u += 1 + a % 10; | |
ec2c5e43 | 1152 | |
e7c1b0e4 | 1153 | if (asprintf(&n, "%.*s%" PRIu64, (int) (p - old), old, u) < 0) |
ec2c5e43 LP |
1154 | return -ENOMEM; |
1155 | ||
e7c1b0e4 DR |
1156 | *ret_new = n; |
1157 | ||
1158 | return 0; | |
1159 | } | |
1160 | ||
1161 | int manager_next_hostname(Manager *m) { | |
1162 | _cleanup_free_ char *h = NULL, *k = NULL; | |
1163 | int r; | |
1164 | ||
1165 | assert(m); | |
1166 | ||
1167 | r = manager_next_random_name(m->llmnr_hostname, &h); | |
1168 | if (r < 0) | |
1169 | return r; | |
1170 | ||
78c6a153 | 1171 | r = dns_name_concat(h, "local", &k); |
e7c1b0e4 | 1172 | if (r < 0) |
78c6a153 | 1173 | return r; |
78c6a153 LP |
1174 | |
1175 | log_info("Hostname conflict, changing published hostname from '%s' to '%s'.", m->llmnr_hostname, h); | |
1176 | ||
e7c1b0e4 DR |
1177 | free_and_replace(m->llmnr_hostname, h); |
1178 | free_and_replace(m->mdns_hostname, k); | |
ec2c5e43 | 1179 | |
eb60f9cd | 1180 | manager_refresh_rrs(m); |
623a4c97 LP |
1181 | |
1182 | return 0; | |
1183 | } | |
ec2c5e43 | 1184 | |
4e945a6f | 1185 | LinkAddress* manager_find_link_address(Manager *m, int family, const union in_addr_union *in_addr) { |
ec2c5e43 LP |
1186 | Iterator i; |
1187 | Link *l; | |
1188 | ||
1189 | assert(m); | |
1190 | ||
1191 | HASHMAP_FOREACH(l, m->links, i) { | |
1192 | LinkAddress *a; | |
1193 | ||
1194 | a = link_find_address(l, family, in_addr); | |
1195 | if (a) | |
1196 | return a; | |
1197 | } | |
1198 | ||
1199 | return NULL; | |
1200 | } | |
1201 | ||
a4076574 | 1202 | bool manager_our_packet(Manager *m, DnsPacket *p) { |
ec2c5e43 LP |
1203 | assert(m); |
1204 | assert(p); | |
1205 | ||
4e945a6f | 1206 | return !!manager_find_link_address(m, p->family, &p->sender); |
ec2c5e43 | 1207 | } |
4e945a6f | 1208 | |
a4076574 LP |
1209 | DnsScope* manager_find_scope(Manager *m, DnsPacket *p) { |
1210 | Link *l; | |
1211 | ||
1212 | assert(m); | |
1213 | assert(p); | |
1214 | ||
1215 | l = hashmap_get(m->links, INT_TO_PTR(p->ifindex)); | |
1216 | if (!l) | |
1217 | return NULL; | |
1218 | ||
b4f1862d DM |
1219 | switch (p->protocol) { |
1220 | case DNS_PROTOCOL_LLMNR: | |
a4076574 LP |
1221 | if (p->family == AF_INET) |
1222 | return l->llmnr_ipv4_scope; | |
1223 | else if (p->family == AF_INET6) | |
1224 | return l->llmnr_ipv6_scope; | |
b4f1862d DM |
1225 | |
1226 | break; | |
1227 | ||
1228 | case DNS_PROTOCOL_MDNS: | |
1229 | if (p->family == AF_INET) | |
1230 | return l->mdns_ipv4_scope; | |
1231 | else if (p->family == AF_INET6) | |
1232 | return l->mdns_ipv6_scope; | |
1233 | ||
1234 | break; | |
1235 | ||
1236 | default: | |
1237 | break; | |
a4076574 LP |
1238 | } |
1239 | ||
1240 | return NULL; | |
1241 | } | |
1242 | ||
902bb5d8 LP |
1243 | void manager_verify_all(Manager *m) { |
1244 | DnsScope *s; | |
1245 | ||
1246 | assert(m); | |
1247 | ||
1248 | LIST_FOREACH(scopes, s, m->dns_scopes) | |
1249 | dns_zone_verify_all(&s->zone); | |
1250 | } | |
1251 | ||
78c6a153 | 1252 | int manager_is_own_hostname(Manager *m, const char *name) { |
78c6a153 LP |
1253 | int r; |
1254 | ||
1255 | assert(m); | |
1256 | assert(name); | |
1257 | ||
1258 | if (m->llmnr_hostname) { | |
1259 | r = dns_name_equal(name, m->llmnr_hostname); | |
1260 | if (r != 0) | |
1261 | return r; | |
1262 | } | |
1263 | ||
e96de0ce LP |
1264 | if (m->mdns_hostname) { |
1265 | r = dns_name_equal(name, m->mdns_hostname); | |
1266 | if (r != 0) | |
1267 | return r; | |
1268 | } | |
1269 | ||
1270 | if (m->full_hostname) | |
1271 | return dns_name_equal(name, m->full_hostname); | |
78c6a153 LP |
1272 | |
1273 | return 0; | |
1274 | } | |
1275 | ||
9176a57c LP |
1276 | int manager_compile_dns_servers(Manager *m, OrderedSet **dns) { |
1277 | DnsServer *s; | |
1278 | Iterator i; | |
1279 | Link *l; | |
1280 | int r; | |
1281 | ||
1282 | assert(m); | |
1283 | assert(dns); | |
1284 | ||
1285 | r = ordered_set_ensure_allocated(dns, &dns_server_hash_ops); | |
1286 | if (r < 0) | |
1287 | return r; | |
1288 | ||
1289 | /* First add the system-wide servers and domains */ | |
1290 | LIST_FOREACH(servers, s, m->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 | /* Then, add the per-link servers */ | |
1299 | HASHMAP_FOREACH(l, m->links, i) { | |
1300 | LIST_FOREACH(servers, s, l->dns_servers) { | |
1301 | r = ordered_set_put(*dns, s); | |
1302 | if (r == -EEXIST) | |
1303 | continue; | |
1304 | if (r < 0) | |
1305 | return r; | |
1306 | } | |
1307 | } | |
1308 | ||
1309 | /* If we found nothing, add the fallback servers */ | |
1310 | if (ordered_set_isempty(*dns)) { | |
1311 | LIST_FOREACH(servers, s, m->fallback_dns_servers) { | |
1312 | r = ordered_set_put(*dns, s); | |
1313 | if (r == -EEXIST) | |
1314 | continue; | |
1315 | if (r < 0) | |
1316 | return r; | |
1317 | } | |
1318 | } | |
1319 | ||
1320 | return 0; | |
1321 | } | |
1322 | ||
94363cbb MP |
1323 | /* filter_route is a tri-state: |
1324 | * < 0: no filtering | |
1325 | * = 0 or false: return only domains which should be used for searching | |
1326 | * > 0 or true: return only domains which are for routing only | |
1327 | */ | |
6f7da49d | 1328 | int manager_compile_search_domains(Manager *m, OrderedSet **domains, int filter_route) { |
9176a57c LP |
1329 | DnsSearchDomain *d; |
1330 | Iterator i; | |
1331 | Link *l; | |
1332 | int r; | |
1333 | ||
1334 | assert(m); | |
1335 | assert(domains); | |
1336 | ||
1337 | r = ordered_set_ensure_allocated(domains, &dns_name_hash_ops); | |
1338 | if (r < 0) | |
1339 | return r; | |
1340 | ||
1341 | LIST_FOREACH(domains, d, m->search_domains) { | |
6f7da49d LP |
1342 | |
1343 | if (filter_route >= 0 && | |
1344 | d->route_only != !!filter_route) | |
1345 | continue; | |
1346 | ||
9176a57c LP |
1347 | r = ordered_set_put(*domains, d->name); |
1348 | if (r == -EEXIST) | |
1349 | continue; | |
1350 | if (r < 0) | |
1351 | return r; | |
1352 | } | |
1353 | ||
1354 | HASHMAP_FOREACH(l, m->links, i) { | |
1355 | ||
1356 | LIST_FOREACH(domains, d, l->search_domains) { | |
6f7da49d LP |
1357 | |
1358 | if (filter_route >= 0 && | |
1359 | d->route_only != !!filter_route) | |
1360 | continue; | |
1361 | ||
9176a57c LP |
1362 | r = ordered_set_put(*domains, d->name); |
1363 | if (r == -EEXIST) | |
1364 | continue; | |
1365 | if (r < 0) | |
1366 | return r; | |
1367 | } | |
1368 | } | |
1369 | ||
1370 | return 0; | |
1371 | } | |
c69fa7e3 LP |
1372 | |
1373 | DnssecMode manager_get_dnssec_mode(Manager *m) { | |
1374 | assert(m); | |
1375 | ||
1376 | if (m->dnssec_mode != _DNSSEC_MODE_INVALID) | |
1377 | return m->dnssec_mode; | |
1378 | ||
1379 | return DNSSEC_NO; | |
1380 | } | |
1381 | ||
1382 | bool manager_dnssec_supported(Manager *m) { | |
1383 | DnsServer *server; | |
1384 | Iterator i; | |
1385 | Link *l; | |
1386 | ||
1387 | assert(m); | |
1388 | ||
1389 | if (manager_get_dnssec_mode(m) == DNSSEC_NO) | |
1390 | return false; | |
1391 | ||
1392 | server = manager_get_dns_server(m); | |
1393 | if (server && !dns_server_dnssec_supported(server)) | |
1394 | return false; | |
1395 | ||
1396 | HASHMAP_FOREACH(l, m->links, i) | |
1397 | if (!link_dnssec_supported(l)) | |
1398 | return false; | |
1399 | ||
1400 | return true; | |
1401 | } | |
59c5b597 LP |
1402 | |
1403 | void manager_dnssec_verdict(Manager *m, DnssecVerdict verdict, const DnsResourceKey *key) { | |
1404 | ||
1405 | assert(verdict >= 0); | |
1406 | assert(verdict < _DNSSEC_VERDICT_MAX); | |
1407 | ||
f1d34068 | 1408 | if (DEBUG_LOGGING) { |
202b76ae | 1409 | char s[DNS_RESOURCE_KEY_STRING_MAX]; |
59c5b597 | 1410 | |
202b76ae ZJS |
1411 | log_debug("Found verdict for lookup %s: %s", |
1412 | dns_resource_key_to_string(key, s, sizeof s), | |
1413 | dnssec_verdict_to_string(verdict)); | |
59c5b597 LP |
1414 | } |
1415 | ||
1416 | m->n_dnssec_verdict[verdict]++; | |
1417 | } | |
011696f7 LP |
1418 | |
1419 | bool manager_routable(Manager *m, int family) { | |
1420 | Iterator i; | |
1421 | Link *l; | |
1422 | ||
1423 | assert(m); | |
1424 | ||
1425 | /* Returns true if the host has at least one interface with a routable address of the specified type */ | |
1426 | ||
1427 | HASHMAP_FOREACH(l, m->links, i) | |
1428 | if (link_relevant(l, family, false)) | |
1429 | return true; | |
1430 | ||
1431 | return false; | |
1432 | } | |
ba35662f LP |
1433 | |
1434 | void manager_flush_caches(Manager *m) { | |
1435 | DnsScope *scope; | |
1436 | ||
1437 | assert(m); | |
1438 | ||
1439 | LIST_FOREACH(scopes, scope, m->dns_scopes) | |
1440 | dns_cache_flush(&scope->cache); | |
aac57b35 ZJS |
1441 | |
1442 | log_info("Flushed all caches."); | |
ba35662f | 1443 | } |
943ef07c | 1444 | |
59c0fd0e LP |
1445 | void manager_reset_server_features(Manager *m) { |
1446 | Iterator i; | |
1447 | Link *l; | |
1448 | ||
1449 | dns_server_reset_features_all(m->dns_servers); | |
1450 | dns_server_reset_features_all(m->fallback_dns_servers); | |
1451 | ||
1452 | HASHMAP_FOREACH(l, m->links, i) | |
1453 | dns_server_reset_features_all(l->dns_servers); | |
1454 | ||
1455 | log_info("Resetting learnt feature levels on all servers."); | |
1456 | } | |
1457 | ||
943ef07c LP |
1458 | void manager_cleanup_saved_user(Manager *m) { |
1459 | _cleanup_closedir_ DIR *d = NULL; | |
1460 | struct dirent *de; | |
1461 | int r; | |
1462 | ||
1463 | assert(m); | |
1464 | ||
1465 | /* Clean up all saved per-link files in /run/systemd/resolve/netif/ that don't have a matching interface | |
1466 | * anymore. These files are created to persist settings pushed in by the user via the bus, so that resolved can | |
1467 | * be restarted without losing this data. */ | |
1468 | ||
1469 | d = opendir("/run/systemd/resolve/netif/"); | |
1470 | if (!d) { | |
1471 | if (errno == ENOENT) | |
1472 | return; | |
1473 | ||
1474 | log_warning_errno(errno, "Failed to open interface directory: %m"); | |
1475 | return; | |
1476 | } | |
1477 | ||
1478 | FOREACH_DIRENT_ALL(de, d, log_error_errno(errno, "Failed to read interface directory: %m")) { | |
1479 | _cleanup_free_ char *p = NULL; | |
1480 | int ifindex; | |
1481 | Link *l; | |
1482 | ||
1483 | if (!IN_SET(de->d_type, DT_UNKNOWN, DT_REG)) | |
1484 | continue; | |
1485 | ||
49bfc877 | 1486 | if (dot_or_dot_dot(de->d_name)) |
943ef07c LP |
1487 | continue; |
1488 | ||
1489 | r = parse_ifindex(de->d_name, &ifindex); | |
1490 | if (r < 0) /* Probably some temporary file from a previous run. Delete it */ | |
1491 | goto rm; | |
1492 | ||
1493 | l = hashmap_get(m->links, INT_TO_PTR(ifindex)); | |
1494 | if (!l) /* link vanished */ | |
1495 | goto rm; | |
1496 | ||
1497 | if (l->is_managed) /* now managed by networkd, hence the bus settings are useless */ | |
1498 | goto rm; | |
1499 | ||
1500 | continue; | |
1501 | ||
1502 | rm: | |
1503 | p = strappend("/run/systemd/resolve/netif/", de->d_name); | |
1504 | if (!p) { | |
1505 | log_oom(); | |
1506 | return; | |
1507 | } | |
1508 | ||
1509 | (void) unlink(p); | |
1510 | } | |
1511 | } | |
e7c1b0e4 DR |
1512 | |
1513 | bool manager_next_dnssd_names(Manager *m) { | |
1514 | Iterator i; | |
1515 | DnssdService *s; | |
1516 | bool tried = false; | |
1517 | int r; | |
1518 | ||
1519 | assert(m); | |
1520 | ||
1521 | HASHMAP_FOREACH(s, m->dnssd_services, i) { | |
1522 | _cleanup_free_ char * new_name = NULL; | |
1523 | ||
1524 | if (!s->withdrawn) | |
1525 | continue; | |
1526 | ||
1527 | r = manager_next_random_name(s->name_template, &new_name); | |
1528 | if (r < 0) { | |
1529 | log_warning_errno(r, "Failed to get new name for service '%s': %m", s->name); | |
1530 | continue; | |
1531 | } | |
1532 | ||
1533 | free_and_replace(s->name_template, new_name); | |
1534 | ||
1535 | s->withdrawn = false; | |
1536 | ||
1537 | tried = true; | |
1538 | } | |
1539 | ||
1540 | if (tried) | |
1541 | manager_refresh_rrs(m); | |
1542 | ||
1543 | return tried; | |
1544 | } |