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091a364c TG |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2014 Tom Gundersen <teg@jklm.no> | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
07630cea LP |
22 | #include <netinet/in.h> |
23 | #include <poll.h> | |
74b2466e | 24 | #include <sys/ioctl.h> |
091a364c | 25 | |
a2a416f7 | 26 | #include "af-list.h" |
b5efdb8a | 27 | #include "alloc-util.h" |
07630cea | 28 | #include "dns-domain.h" |
3ffd4af2 | 29 | #include "fd-util.h" |
a5a807e6 | 30 | #include "fileio-label.h" |
07630cea | 31 | #include "hostname-util.h" |
c004493c | 32 | #include "io-util.h" |
07630cea LP |
33 | #include "netlink-util.h" |
34 | #include "network-internal.h" | |
822db23c | 35 | #include "ordered-set.h" |
6bedfcbb | 36 | #include "parse-util.h" |
3df3e884 | 37 | #include "random-util.h" |
39d8db04 | 38 | #include "resolved-bus.h" |
07630cea | 39 | #include "resolved-conf.h" |
5f402ae8 | 40 | #include "resolved-llmnr.h" |
07630cea | 41 | #include "resolved-manager.h" |
f8dc7e34 | 42 | #include "resolved-resolv-conf.h" |
07630cea | 43 | #include "socket-util.h" |
8b43440b | 44 | #include "string-table.h" |
07630cea LP |
45 | #include "string-util.h" |
46 | #include "utf8.h" | |
74b2466e LP |
47 | |
48 | #define SEND_TIMEOUT_USEC (200 * USEC_PER_MSEC) | |
49 | ||
1c4baffc | 50 | static int manager_process_link(sd_netlink *rtnl, sd_netlink_message *mm, void *userdata) { |
74b2466e LP |
51 | Manager *m = userdata; |
52 | uint16_t type; | |
53 | Link *l; | |
54 | int ifindex, r; | |
55 | ||
56 | assert(rtnl); | |
57 | assert(m); | |
58 | assert(mm); | |
59 | ||
1c4baffc | 60 | r = sd_netlink_message_get_type(mm, &type); |
74b2466e LP |
61 | if (r < 0) |
62 | goto fail; | |
63 | ||
64 | r = sd_rtnl_message_link_get_ifindex(mm, &ifindex); | |
65 | if (r < 0) | |
66 | goto fail; | |
67 | ||
68 | l = hashmap_get(m->links, INT_TO_PTR(ifindex)); | |
69 | ||
70 | switch (type) { | |
71 | ||
a2a416f7 LP |
72 | case RTM_NEWLINK:{ |
73 | bool is_new = !l; | |
74b2466e | 74 | |
a2a416f7 | 75 | if (!l) { |
74b2466e LP |
76 | r = link_new(m, &l, ifindex); |
77 | if (r < 0) | |
78 | goto fail; | |
79 | } | |
80 | ||
81 | r = link_update_rtnl(l, mm); | |
82 | if (r < 0) | |
83 | goto fail; | |
84 | ||
21d73c87 LP |
85 | r = link_update_monitor(l); |
86 | if (r < 0) | |
87 | goto fail; | |
88 | ||
a2a416f7 LP |
89 | if (is_new) |
90 | log_debug("Found new link %i/%s", ifindex, l->name); | |
91 | ||
74b2466e | 92 | break; |
a2a416f7 | 93 | } |
74b2466e LP |
94 | |
95 | case RTM_DELLINK: | |
96 | if (l) { | |
a2a416f7 | 97 | log_debug("Removing link %i/%s", l->ifindex, l->name); |
74b2466e LP |
98 | link_free(l); |
99 | } | |
100 | ||
101 | break; | |
102 | } | |
103 | ||
104 | return 0; | |
105 | ||
106 | fail: | |
da927ba9 | 107 | log_warning_errno(r, "Failed to process RTNL link message: %m"); |
74b2466e LP |
108 | return 0; |
109 | } | |
110 | ||
1c4baffc | 111 | static int manager_process_address(sd_netlink *rtnl, sd_netlink_message *mm, void *userdata) { |
74b2466e LP |
112 | Manager *m = userdata; |
113 | union in_addr_union address; | |
74b2466e | 114 | uint16_t type; |
0dd25fb9 | 115 | int r, ifindex, family; |
74b2466e LP |
116 | LinkAddress *a; |
117 | Link *l; | |
118 | ||
119 | assert(rtnl); | |
120 | assert(mm); | |
121 | assert(m); | |
122 | ||
1c4baffc | 123 | r = sd_netlink_message_get_type(mm, &type); |
74b2466e LP |
124 | if (r < 0) |
125 | goto fail; | |
126 | ||
127 | r = sd_rtnl_message_addr_get_ifindex(mm, &ifindex); | |
128 | if (r < 0) | |
129 | goto fail; | |
130 | ||
131 | l = hashmap_get(m->links, INT_TO_PTR(ifindex)); | |
132 | if (!l) | |
133 | return 0; | |
134 | ||
135 | r = sd_rtnl_message_addr_get_family(mm, &family); | |
136 | if (r < 0) | |
137 | goto fail; | |
138 | ||
139 | switch (family) { | |
140 | ||
141 | case AF_INET: | |
1c4baffc | 142 | r = sd_netlink_message_read_in_addr(mm, IFA_LOCAL, &address.in); |
74b2466e | 143 | if (r < 0) { |
1c4baffc | 144 | r = sd_netlink_message_read_in_addr(mm, IFA_ADDRESS, &address.in); |
74b2466e LP |
145 | if (r < 0) |
146 | goto fail; | |
147 | } | |
148 | ||
149 | break; | |
150 | ||
151 | case AF_INET6: | |
1c4baffc | 152 | r = sd_netlink_message_read_in6_addr(mm, IFA_LOCAL, &address.in6); |
74b2466e | 153 | if (r < 0) { |
1c4baffc | 154 | r = sd_netlink_message_read_in6_addr(mm, IFA_ADDRESS, &address.in6); |
74b2466e LP |
155 | if (r < 0) |
156 | goto fail; | |
157 | } | |
158 | ||
159 | break; | |
160 | ||
161 | default: | |
162 | return 0; | |
163 | } | |
164 | ||
165 | a = link_find_address(l, family, &address); | |
166 | ||
167 | switch (type) { | |
168 | ||
169 | case RTM_NEWADDR: | |
170 | ||
171 | if (!a) { | |
172 | r = link_address_new(l, &a, family, &address); | |
173 | if (r < 0) | |
174 | return r; | |
175 | } | |
176 | ||
177 | r = link_address_update_rtnl(a, mm); | |
178 | if (r < 0) | |
179 | return r; | |
180 | ||
181 | break; | |
182 | ||
183 | case RTM_DELADDR: | |
3e044c49 | 184 | link_address_free(a); |
74b2466e LP |
185 | break; |
186 | } | |
187 | ||
188 | return 0; | |
189 | ||
190 | fail: | |
da927ba9 | 191 | log_warning_errno(r, "Failed to process RTNL address message: %m"); |
74b2466e LP |
192 | return 0; |
193 | } | |
194 | ||
74b2466e | 195 | static int manager_rtnl_listen(Manager *m) { |
1c4baffc TG |
196 | _cleanup_netlink_message_unref_ sd_netlink_message *req = NULL, *reply = NULL; |
197 | sd_netlink_message *i; | |
74b2466e LP |
198 | int r; |
199 | ||
200 | assert(m); | |
201 | ||
cc98b302 | 202 | /* First, subscribe to interfaces coming and going */ |
1c4baffc | 203 | r = sd_netlink_open(&m->rtnl); |
74b2466e LP |
204 | if (r < 0) |
205 | return r; | |
206 | ||
1c4baffc | 207 | r = sd_netlink_attach_event(m->rtnl, m->event, 0); |
74b2466e LP |
208 | if (r < 0) |
209 | return r; | |
210 | ||
1c4baffc | 211 | r = sd_netlink_add_match(m->rtnl, RTM_NEWLINK, manager_process_link, m); |
74b2466e LP |
212 | if (r < 0) |
213 | return r; | |
214 | ||
1c4baffc | 215 | r = sd_netlink_add_match(m->rtnl, RTM_DELLINK, manager_process_link, m); |
74b2466e LP |
216 | if (r < 0) |
217 | return r; | |
218 | ||
1c4baffc | 219 | r = sd_netlink_add_match(m->rtnl, RTM_NEWADDR, manager_process_address, m); |
74b2466e LP |
220 | if (r < 0) |
221 | return r; | |
091a364c | 222 | |
1c4baffc | 223 | r = sd_netlink_add_match(m->rtnl, RTM_DELADDR, manager_process_address, m); |
74b2466e LP |
224 | if (r < 0) |
225 | return r; | |
226 | ||
227 | /* Then, enumerate all links */ | |
228 | r = sd_rtnl_message_new_link(m->rtnl, &req, RTM_GETLINK, 0); | |
229 | if (r < 0) | |
230 | return r; | |
231 | ||
1c4baffc | 232 | r = sd_netlink_message_request_dump(req, true); |
74b2466e LP |
233 | if (r < 0) |
234 | return r; | |
235 | ||
1c4baffc | 236 | r = sd_netlink_call(m->rtnl, req, 0, &reply); |
74b2466e LP |
237 | if (r < 0) |
238 | return r; | |
239 | ||
1c4baffc | 240 | for (i = reply; i; i = sd_netlink_message_next(i)) { |
74b2466e LP |
241 | r = manager_process_link(m->rtnl, i, m); |
242 | if (r < 0) | |
243 | return r; | |
244 | } | |
245 | ||
1c4baffc TG |
246 | req = sd_netlink_message_unref(req); |
247 | reply = sd_netlink_message_unref(reply); | |
74b2466e LP |
248 | |
249 | /* Finally, enumerate all addresses, too */ | |
250 | r = sd_rtnl_message_new_addr(m->rtnl, &req, RTM_GETADDR, 0, AF_UNSPEC); | |
251 | if (r < 0) | |
252 | return r; | |
253 | ||
1c4baffc | 254 | r = sd_netlink_message_request_dump(req, true); |
74b2466e LP |
255 | if (r < 0) |
256 | return r; | |
257 | ||
1c4baffc | 258 | r = sd_netlink_call(m->rtnl, req, 0, &reply); |
74b2466e LP |
259 | if (r < 0) |
260 | return r; | |
261 | ||
1c4baffc | 262 | for (i = reply; i; i = sd_netlink_message_next(i)) { |
74b2466e LP |
263 | r = manager_process_address(m->rtnl, i, m); |
264 | if (r < 0) | |
265 | return r; | |
266 | } | |
267 | ||
268 | return r; | |
269 | } | |
270 | ||
271 | static int on_network_event(sd_event_source *s, int fd, uint32_t revents, void *userdata) { | |
272 | Manager *m = userdata; | |
273 | Iterator i; | |
274 | Link *l; | |
275 | int r; | |
276 | ||
277 | assert(m); | |
278 | ||
279 | sd_network_monitor_flush(m->network_monitor); | |
280 | ||
281 | HASHMAP_FOREACH(l, m->links, i) { | |
282 | r = link_update_monitor(l); | |
283 | if (r < 0) | |
da927ba9 | 284 | log_warning_errno(r, "Failed to update monitor information for %i: %m", l->ifindex); |
74b2466e LP |
285 | } |
286 | ||
287 | r = manager_write_resolv_conf(m); | |
288 | if (r < 0) | |
da927ba9 | 289 | log_warning_errno(r, "Could not update resolv.conf: %m"); |
74b2466e LP |
290 | |
291 | return 0; | |
292 | } | |
293 | ||
294 | static int manager_network_monitor_listen(Manager *m) { | |
295 | int r, fd, events; | |
296 | ||
297 | assert(m); | |
298 | ||
0014a4ad | 299 | r = sd_network_monitor_new(&m->network_monitor, NULL); |
74b2466e LP |
300 | if (r < 0) |
301 | return r; | |
302 | ||
303 | fd = sd_network_monitor_get_fd(m->network_monitor); | |
304 | if (fd < 0) | |
305 | return fd; | |
306 | ||
307 | events = sd_network_monitor_get_events(m->network_monitor); | |
308 | if (events < 0) | |
309 | return events; | |
310 | ||
311 | r = sd_event_add_io(m->event, &m->network_event_source, fd, events, &on_network_event, m); | |
312 | if (r < 0) | |
313 | return r; | |
314 | ||
315 | return 0; | |
316 | } | |
317 | ||
78c6a153 | 318 | static int determine_hostname(char **llmnr_hostname, char **mdns_hostname) { |
eb60f9cd | 319 | _cleanup_free_ char *h = NULL, *n = NULL; |
78c6a153 LP |
320 | char label[DNS_LABEL_MAX]; |
321 | const char *p; | |
322 | int r, k; | |
eb60f9cd | 323 | |
78c6a153 LP |
324 | assert(llmnr_hostname); |
325 | assert(mdns_hostname); | |
326 | ||
327 | /* Extract and normalize the first label of the locally | |
328 | * configured hostname, and check it's not "localhost". */ | |
eb60f9cd LP |
329 | |
330 | h = gethostname_malloc(); | |
331 | if (!h) | |
332 | return log_oom(); | |
333 | ||
78c6a153 LP |
334 | p = h; |
335 | r = dns_label_unescape(&p, label, sizeof(label)); | |
336 | if (r < 0) | |
337 | return log_error_errno(r, "Failed to unescape host name: %m"); | |
338 | if (r == 0) { | |
339 | log_error("Couldn't find a single label in hosntame."); | |
340 | return -EINVAL; | |
341 | } | |
342 | ||
343 | k = dns_label_undo_idna(label, r, label, sizeof(label)); | |
344 | if (k < 0) | |
345 | return log_error_errno(k, "Failed to undo IDNA: %m"); | |
346 | if (k > 0) | |
347 | r = k; | |
348 | ||
349 | if (!utf8_is_valid(label)) { | |
eb60f9cd LP |
350 | log_error("System hostname is not UTF-8 clean."); |
351 | return -EINVAL; | |
352 | } | |
353 | ||
78c6a153 LP |
354 | r = dns_label_escape(label, r, &n); |
355 | if (r < 0) | |
356 | return log_error_errno(r, "Failed to escape host name: %m"); | |
357 | ||
358 | if (is_localhost(n)) { | |
359 | log_debug("System hostname is 'localhost', ignoring."); | |
360 | return -EINVAL; | |
eb60f9cd LP |
361 | } |
362 | ||
78c6a153 LP |
363 | r = dns_name_concat(n, "local", mdns_hostname); |
364 | if (r < 0) | |
365 | return log_error_errno(r, "Failed to determine mDNS hostname: %m"); | |
366 | ||
367 | *llmnr_hostname = n; | |
eb60f9cd LP |
368 | n = NULL; |
369 | ||
370 | return 0; | |
371 | } | |
372 | ||
373 | static int on_hostname_change(sd_event_source *es, int fd, uint32_t revents, void *userdata) { | |
78c6a153 | 374 | _cleanup_free_ char *llmnr_hostname = NULL, *mdns_hostname = NULL; |
eb60f9cd LP |
375 | Manager *m = userdata; |
376 | int r; | |
377 | ||
378 | assert(m); | |
379 | ||
78c6a153 | 380 | r = determine_hostname(&llmnr_hostname, &mdns_hostname); |
eb60f9cd LP |
381 | if (r < 0) |
382 | return 0; /* ignore invalid hostnames */ | |
383 | ||
78c6a153 | 384 | if (streq(llmnr_hostname, m->llmnr_hostname) && streq(mdns_hostname, m->mdns_hostname)) |
eb60f9cd LP |
385 | return 0; |
386 | ||
78c6a153 LP |
387 | log_info("System hostname changed to '%s'.", llmnr_hostname); |
388 | ||
389 | free(m->llmnr_hostname); | |
390 | free(m->mdns_hostname); | |
391 | ||
392 | m->llmnr_hostname = llmnr_hostname; | |
393 | m->mdns_hostname = mdns_hostname; | |
394 | ||
395 | llmnr_hostname = mdns_hostname = NULL; | |
eb60f9cd LP |
396 | |
397 | manager_refresh_rrs(m); | |
398 | ||
399 | return 0; | |
400 | } | |
401 | ||
402 | static int manager_watch_hostname(Manager *m) { | |
eb60f9cd LP |
403 | int r; |
404 | ||
405 | assert(m); | |
406 | ||
407 | m->hostname_fd = open("/proc/sys/kernel/hostname", O_RDONLY|O_CLOEXEC|O_NDELAY|O_NOCTTY); | |
408 | if (m->hostname_fd < 0) { | |
56f64d95 | 409 | log_warning_errno(errno, "Failed to watch hostname: %m"); |
eb60f9cd LP |
410 | return 0; |
411 | } | |
412 | ||
413 | r = sd_event_add_io(m->event, &m->hostname_event_source, m->hostname_fd, 0, on_hostname_change, m); | |
414 | if (r < 0) { | |
415 | if (r == -EPERM) | |
416 | /* kernels prior to 3.2 don't support polling this file. Ignore the failure. */ | |
417 | m->hostname_fd = safe_close(m->hostname_fd); | |
8d3d7072 MS |
418 | else |
419 | return log_error_errno(r, "Failed to add hostname event source: %m"); | |
eb60f9cd LP |
420 | } |
421 | ||
78c6a153 | 422 | r = determine_hostname(&m->llmnr_hostname, &m->mdns_hostname); |
eb60f9cd LP |
423 | if (r < 0) { |
424 | log_info("Defaulting to hostname 'linux'."); | |
78c6a153 LP |
425 | m->llmnr_hostname = strdup("linux"); |
426 | if (!m->llmnr_hostname) | |
427 | return log_oom(); | |
428 | ||
429 | m->mdns_hostname = strdup("linux.local"); | |
430 | if (!m->mdns_hostname) | |
eb60f9cd LP |
431 | return log_oom(); |
432 | } else | |
78c6a153 | 433 | log_info("Using system hostname '%s'.", m->llmnr_hostname); |
eb60f9cd LP |
434 | |
435 | return 0; | |
436 | } | |
437 | ||
4d506d6b LP |
438 | static int manager_sigusr1(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { |
439 | _cleanup_free_ char *buffer = NULL; | |
440 | _cleanup_fclose_ FILE *f = NULL; | |
441 | Manager *m = userdata; | |
442 | size_t size = 0; | |
443 | DnsScope *scope; | |
444 | ||
445 | assert(s); | |
446 | assert(si); | |
447 | assert(m); | |
448 | ||
449 | f = open_memstream(&buffer, &size); | |
450 | if (!f) | |
451 | return log_oom(); | |
452 | ||
453 | LIST_FOREACH(scopes, scope, m->dns_scopes) | |
454 | dns_scope_dump(scope, f); | |
455 | ||
456 | if (fflush_and_check(f) < 0) | |
457 | return log_oom(); | |
458 | ||
459 | log_dump(LOG_INFO, buffer); | |
460 | return 0; | |
461 | } | |
462 | ||
091a364c | 463 | int manager_new(Manager **ret) { |
74b2466e | 464 | _cleanup_(manager_freep) Manager *m = NULL; |
091a364c TG |
465 | int r; |
466 | ||
c92e531c LP |
467 | assert(ret); |
468 | ||
091a364c TG |
469 | m = new0(Manager, 1); |
470 | if (!m) | |
471 | return -ENOMEM; | |
472 | ||
1716f6dc | 473 | m->llmnr_ipv4_udp_fd = m->llmnr_ipv6_udp_fd = -1; |
623a4c97 | 474 | m->llmnr_ipv4_tcp_fd = m->llmnr_ipv6_tcp_fd = -1; |
eb60f9cd | 475 | m->hostname_fd = -1; |
1716f6dc | 476 | |
4e945a6f | 477 | m->llmnr_support = SUPPORT_YES; |
5cb36f41 | 478 | m->read_resolv_conf = true; |
091a364c | 479 | |
636e813d | 480 | r = manager_parse_dns_server_string_and_warn(m, DNS_SERVER_FALLBACK, DNS_SERVERS); |
091a364c TG |
481 | if (r < 0) |
482 | return r; | |
483 | ||
484 | r = sd_event_default(&m->event); | |
485 | if (r < 0) | |
486 | return r; | |
487 | ||
488 | sd_event_add_signal(m->event, NULL, SIGTERM, NULL, NULL); | |
489 | sd_event_add_signal(m->event, NULL, SIGINT, NULL, NULL); | |
490 | ||
491 | sd_event_set_watchdog(m->event, true); | |
492 | ||
eb60f9cd LP |
493 | r = manager_watch_hostname(m); |
494 | if (r < 0) | |
495 | return r; | |
496 | ||
1716f6dc | 497 | r = dns_scope_new(m, &m->unicast_scope, NULL, DNS_PROTOCOL_DNS, AF_UNSPEC); |
74b2466e LP |
498 | if (r < 0) |
499 | return r; | |
500 | ||
501 | r = manager_network_monitor_listen(m); | |
502 | if (r < 0) | |
503 | return r; | |
504 | ||
505 | r = manager_rtnl_listen(m); | |
506 | if (r < 0) | |
507 | return r; | |
508 | ||
509 | r = manager_connect_bus(m); | |
510 | if (r < 0) | |
511 | return r; | |
512 | ||
4d506d6b LP |
513 | (void) sd_event_add_signal(m->event, &m->sigusr1_event_source, SIGUSR1, manager_sigusr1, m); |
514 | ||
091a364c TG |
515 | *ret = m; |
516 | m = NULL; | |
517 | ||
518 | return 0; | |
519 | } | |
520 | ||
edc501d4 LP |
521 | int manager_start(Manager *m) { |
522 | int r; | |
523 | ||
524 | assert(m); | |
525 | ||
526 | r = manager_llmnr_start(m); | |
527 | if (r < 0) | |
528 | return r; | |
529 | ||
530 | return 0; | |
531 | } | |
532 | ||
74b2466e LP |
533 | Manager *manager_free(Manager *m) { |
534 | Link *l; | |
091a364c TG |
535 | |
536 | if (!m) | |
74b2466e LP |
537 | return NULL; |
538 | ||
0eac4623 LP |
539 | manager_flush_dns_servers(m, DNS_SERVER_SYSTEM); |
540 | manager_flush_dns_servers(m, DNS_SERVER_FALLBACK); | |
541 | ||
74b2466e LP |
542 | while ((l = hashmap_first(m->links))) |
543 | link_free(l); | |
f0e15467 LP |
544 | |
545 | while (m->dns_queries) | |
546 | dns_query_free(m->dns_queries); | |
74b2466e | 547 | |
cab5b059 LP |
548 | dns_scope_free(m->unicast_scope); |
549 | ||
f0e15467 LP |
550 | hashmap_free(m->links); |
551 | hashmap_free(m->dns_transactions); | |
552 | ||
096b6773 LP |
553 | sd_event_source_unref(m->network_event_source); |
554 | sd_network_monitor_unref(m->network_monitor); | |
091a364c | 555 | |
a564ca2f LP |
556 | sd_netlink_unref(m->rtnl); |
557 | sd_event_source_unref(m->rtnl_event_source); | |
558 | ||
edc501d4 | 559 | manager_llmnr_stop(m); |
623a4c97 | 560 | |
902bb5d8 | 561 | sd_bus_slot_unref(m->prepare_for_sleep_slot); |
74b2466e LP |
562 | sd_event_source_unref(m->bus_retry_event_source); |
563 | sd_bus_unref(m->bus); | |
091a364c | 564 | |
4d506d6b LP |
565 | sd_event_source_unref(m->sigusr1_event_source); |
566 | ||
74b2466e | 567 | sd_event_unref(m->event); |
623a4c97 | 568 | |
78c6a153 LP |
569 | dns_resource_key_unref(m->llmnr_host_ipv4_key); |
570 | dns_resource_key_unref(m->llmnr_host_ipv6_key); | |
eb60f9cd | 571 | |
eb60f9cd | 572 | sd_event_source_unref(m->hostname_event_source); |
d9fcf2ba | 573 | safe_close(m->hostname_fd); |
78c6a153 LP |
574 | free(m->llmnr_hostname); |
575 | free(m->mdns_hostname); | |
eb60f9cd | 576 | |
091a364c | 577 | free(m); |
74b2466e LP |
578 | |
579 | return NULL; | |
091a364c TG |
580 | } |
581 | ||
1716f6dc | 582 | int manager_recv(Manager *m, int fd, DnsProtocol protocol, DnsPacket **ret) { |
74b2466e | 583 | _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL; |
1716f6dc LP |
584 | union { |
585 | struct cmsghdr header; /* For alignment */ | |
40a1eebd | 586 | uint8_t buffer[CMSG_SPACE(MAXSIZE(struct in_pktinfo, struct in6_pktinfo)) |
1716f6dc | 587 | + CMSG_SPACE(int) /* ttl/hoplimit */ |
623a4c97 | 588 | + EXTRA_CMSG_SPACE /* kernel appears to require extra buffer space */]; |
1716f6dc LP |
589 | } control; |
590 | union sockaddr_union sa; | |
74b2466e | 591 | struct msghdr mh = {}; |
1716f6dc | 592 | struct cmsghdr *cmsg; |
74b2466e | 593 | struct iovec iov; |
1716f6dc | 594 | int ms = 0, r; |
74b2466e LP |
595 | ssize_t l; |
596 | ||
597 | assert(m); | |
1716f6dc | 598 | assert(fd >= 0); |
74b2466e LP |
599 | assert(ret); |
600 | ||
74b2466e LP |
601 | r = ioctl(fd, FIONREAD, &ms); |
602 | if (r < 0) | |
603 | return -errno; | |
604 | if (ms < 0) | |
605 | return -EIO; | |
606 | ||
1716f6dc | 607 | r = dns_packet_new(&p, protocol, ms); |
74b2466e LP |
608 | if (r < 0) |
609 | return r; | |
610 | ||
611 | iov.iov_base = DNS_PACKET_DATA(p); | |
612 | iov.iov_len = p->allocated; | |
613 | ||
1716f6dc LP |
614 | mh.msg_name = &sa.sa; |
615 | mh.msg_namelen = sizeof(sa); | |
74b2466e LP |
616 | mh.msg_iov = &iov; |
617 | mh.msg_iovlen = 1; | |
1716f6dc LP |
618 | mh.msg_control = &control; |
619 | mh.msg_controllen = sizeof(control); | |
74b2466e | 620 | |
a38d9945 | 621 | l = recvmsg(fd, &mh, 0); |
74b2466e | 622 | if (l < 0) { |
ad867662 | 623 | if (errno == EAGAIN || errno == EINTR) |
74b2466e LP |
624 | return 0; |
625 | ||
626 | return -errno; | |
091a364c TG |
627 | } |
628 | ||
74b2466e LP |
629 | if (l <= 0) |
630 | return -EIO; | |
091a364c | 631 | |
1716f6dc LP |
632 | assert(!(mh.msg_flags & MSG_CTRUNC)); |
633 | assert(!(mh.msg_flags & MSG_TRUNC)); | |
634 | ||
74b2466e | 635 | p->size = (size_t) l; |
091a364c | 636 | |
1716f6dc | 637 | p->family = sa.sa.sa_family; |
623a4c97 LP |
638 | p->ipproto = IPPROTO_UDP; |
639 | if (p->family == AF_INET) { | |
1716f6dc | 640 | p->sender.in = sa.in.sin_addr; |
623a4c97 LP |
641 | p->sender_port = be16toh(sa.in.sin_port); |
642 | } else if (p->family == AF_INET6) { | |
1716f6dc | 643 | p->sender.in6 = sa.in6.sin6_addr; |
623a4c97 LP |
644 | p->sender_port = be16toh(sa.in6.sin6_port); |
645 | p->ifindex = sa.in6.sin6_scope_id; | |
646 | } else | |
1716f6dc | 647 | return -EAFNOSUPPORT; |
74b2466e | 648 | |
2a1288ff | 649 | CMSG_FOREACH(cmsg, &mh) { |
74b2466e | 650 | |
1716f6dc LP |
651 | if (cmsg->cmsg_level == IPPROTO_IPV6) { |
652 | assert(p->family == AF_INET6); | |
74b2466e | 653 | |
1716f6dc | 654 | switch (cmsg->cmsg_type) { |
74b2466e | 655 | |
1716f6dc LP |
656 | case IPV6_PKTINFO: { |
657 | struct in6_pktinfo *i = (struct in6_pktinfo*) CMSG_DATA(cmsg); | |
74b2466e | 658 | |
623a4c97 LP |
659 | if (p->ifindex <= 0) |
660 | p->ifindex = i->ipi6_ifindex; | |
661 | ||
1716f6dc LP |
662 | p->destination.in6 = i->ipi6_addr; |
663 | break; | |
664 | } | |
74b2466e | 665 | |
1716f6dc LP |
666 | case IPV6_HOPLIMIT: |
667 | p->ttl = *(int *) CMSG_DATA(cmsg); | |
668 | break; | |
74b2466e | 669 | |
1716f6dc LP |
670 | } |
671 | } else if (cmsg->cmsg_level == IPPROTO_IP) { | |
672 | assert(p->family == AF_INET); | |
74b2466e | 673 | |
1716f6dc | 674 | switch (cmsg->cmsg_type) { |
74b2466e | 675 | |
1716f6dc LP |
676 | case IP_PKTINFO: { |
677 | struct in_pktinfo *i = (struct in_pktinfo*) CMSG_DATA(cmsg); | |
091a364c | 678 | |
623a4c97 LP |
679 | if (p->ifindex <= 0) |
680 | p->ifindex = i->ipi_ifindex; | |
681 | ||
1716f6dc LP |
682 | p->destination.in = i->ipi_addr; |
683 | break; | |
684 | } | |
74b2466e | 685 | |
623a4c97 | 686 | case IP_TTL: |
1716f6dc LP |
687 | p->ttl = *(int *) CMSG_DATA(cmsg); |
688 | break; | |
689 | } | |
690 | } | |
691 | } | |
74b2466e | 692 | |
623a4c97 LP |
693 | /* The Linux kernel sets the interface index to the loopback |
694 | * device if the packet came from the local host since it | |
695 | * avoids the routing table in such a case. Let's unset the | |
696 | * interface index in such a case. */ | |
a5f03596 | 697 | if (p->ifindex == LOOPBACK_IFINDEX) |
623a4c97 LP |
698 | p->ifindex = 0; |
699 | ||
86ad4cd7 TG |
700 | if (protocol != DNS_PROTOCOL_DNS) { |
701 | /* If we don't know the interface index still, we look for the | |
702 | * first local interface with a matching address. Yuck! */ | |
703 | if (p->ifindex <= 0) | |
704 | p->ifindex = manager_find_ifindex(m, p->family, &p->destination); | |
705 | } | |
623a4c97 | 706 | |
74b2466e LP |
707 | *ret = p; |
708 | p = NULL; | |
709 | ||
710 | return 1; | |
711 | } | |
712 | ||
74b2466e LP |
713 | static int sendmsg_loop(int fd, struct msghdr *mh, int flags) { |
714 | int r; | |
715 | ||
716 | assert(fd >= 0); | |
717 | assert(mh); | |
718 | ||
719 | for (;;) { | |
720 | if (sendmsg(fd, mh, flags) >= 0) | |
721 | return 0; | |
722 | ||
723 | if (errno == EINTR) | |
724 | continue; | |
725 | ||
726 | if (errno != EAGAIN) | |
727 | return -errno; | |
728 | ||
729 | r = fd_wait_for_event(fd, POLLOUT, SEND_TIMEOUT_USEC); | |
730 | if (r < 0) | |
731 | return r; | |
732 | if (r == 0) | |
733 | return -ETIMEDOUT; | |
734 | } | |
735 | } | |
736 | ||
72290734 TG |
737 | static int write_loop(int fd, void *message, size_t length) { |
738 | int r; | |
739 | ||
740 | assert(fd >= 0); | |
741 | assert(message); | |
742 | ||
743 | for (;;) { | |
744 | if (write(fd, message, length) >= 0) | |
745 | return 0; | |
746 | ||
747 | if (errno == EINTR) | |
748 | continue; | |
749 | ||
750 | if (errno != EAGAIN) | |
751 | return -errno; | |
752 | ||
753 | r = fd_wait_for_event(fd, POLLOUT, SEND_TIMEOUT_USEC); | |
754 | if (r < 0) | |
755 | return r; | |
756 | if (r == 0) | |
757 | return -ETIMEDOUT; | |
758 | } | |
759 | } | |
760 | ||
761 | int manager_write(Manager *m, int fd, DnsPacket *p) { | |
762 | int r; | |
763 | ||
764 | log_debug("Sending %s packet with id %u", DNS_PACKET_QR(p) ? "response" : "query", DNS_PACKET_ID(p)); | |
765 | ||
766 | r = write_loop(fd, DNS_PACKET_DATA(p), p->size); | |
767 | if (r < 0) | |
768 | return r; | |
769 | ||
770 | return 0; | |
771 | } | |
772 | ||
623a4c97 | 773 | static int manager_ipv4_send(Manager *m, int fd, int ifindex, const struct in_addr *addr, uint16_t port, DnsPacket *p) { |
74b2466e LP |
774 | union sockaddr_union sa = { |
775 | .in.sin_family = AF_INET, | |
74b2466e | 776 | }; |
1716f6dc LP |
777 | union { |
778 | struct cmsghdr header; /* For alignment */ | |
779 | uint8_t buffer[CMSG_SPACE(sizeof(struct in_pktinfo))]; | |
780 | } control; | |
74b2466e LP |
781 | struct msghdr mh = {}; |
782 | struct iovec iov; | |
74b2466e LP |
783 | |
784 | assert(m); | |
1716f6dc LP |
785 | assert(fd >= 0); |
786 | assert(addr); | |
787 | assert(port > 0); | |
74b2466e LP |
788 | assert(p); |
789 | ||
74b2466e LP |
790 | iov.iov_base = DNS_PACKET_DATA(p); |
791 | iov.iov_len = p->size; | |
091a364c | 792 | |
1716f6dc LP |
793 | sa.in.sin_addr = *addr; |
794 | sa.in.sin_port = htobe16(port), | |
091a364c | 795 | |
74b2466e LP |
796 | mh.msg_iov = &iov; |
797 | mh.msg_iovlen = 1; | |
798 | mh.msg_name = &sa.sa; | |
799 | mh.msg_namelen = sizeof(sa.in); | |
091a364c | 800 | |
74b2466e LP |
801 | if (ifindex > 0) { |
802 | struct cmsghdr *cmsg; | |
803 | struct in_pktinfo *pi; | |
804 | ||
805 | zero(control); | |
806 | ||
1716f6dc | 807 | mh.msg_control = &control; |
74b2466e LP |
808 | mh.msg_controllen = CMSG_LEN(sizeof(struct in_pktinfo)); |
809 | ||
810 | cmsg = CMSG_FIRSTHDR(&mh); | |
811 | cmsg->cmsg_len = mh.msg_controllen; | |
812 | cmsg->cmsg_level = IPPROTO_IP; | |
813 | cmsg->cmsg_type = IP_PKTINFO; | |
814 | ||
815 | pi = (struct in_pktinfo*) CMSG_DATA(cmsg); | |
816 | pi->ipi_ifindex = ifindex; | |
817 | } | |
818 | ||
819 | return sendmsg_loop(fd, &mh, 0); | |
820 | } | |
821 | ||
623a4c97 | 822 | static int manager_ipv6_send(Manager *m, int fd, int ifindex, const struct in6_addr *addr, uint16_t port, DnsPacket *p) { |
74b2466e LP |
823 | union sockaddr_union sa = { |
824 | .in6.sin6_family = AF_INET6, | |
74b2466e | 825 | }; |
1716f6dc LP |
826 | union { |
827 | struct cmsghdr header; /* For alignment */ | |
828 | uint8_t buffer[CMSG_SPACE(sizeof(struct in6_pktinfo))]; | |
829 | } control; | |
74b2466e LP |
830 | struct msghdr mh = {}; |
831 | struct iovec iov; | |
74b2466e LP |
832 | |
833 | assert(m); | |
1716f6dc LP |
834 | assert(fd >= 0); |
835 | assert(addr); | |
836 | assert(port > 0); | |
74b2466e LP |
837 | assert(p); |
838 | ||
74b2466e LP |
839 | iov.iov_base = DNS_PACKET_DATA(p); |
840 | iov.iov_len = p->size; | |
841 | ||
1716f6dc LP |
842 | sa.in6.sin6_addr = *addr; |
843 | sa.in6.sin6_port = htobe16(port), | |
74b2466e LP |
844 | sa.in6.sin6_scope_id = ifindex; |
845 | ||
846 | mh.msg_iov = &iov; | |
847 | mh.msg_iovlen = 1; | |
848 | mh.msg_name = &sa.sa; | |
849 | mh.msg_namelen = sizeof(sa.in6); | |
850 | ||
851 | if (ifindex > 0) { | |
852 | struct cmsghdr *cmsg; | |
853 | struct in6_pktinfo *pi; | |
854 | ||
855 | zero(control); | |
856 | ||
1716f6dc | 857 | mh.msg_control = &control; |
74b2466e LP |
858 | mh.msg_controllen = CMSG_LEN(sizeof(struct in6_pktinfo)); |
859 | ||
860 | cmsg = CMSG_FIRSTHDR(&mh); | |
861 | cmsg->cmsg_len = mh.msg_controllen; | |
862 | cmsg->cmsg_level = IPPROTO_IPV6; | |
863 | cmsg->cmsg_type = IPV6_PKTINFO; | |
864 | ||
865 | pi = (struct in6_pktinfo*) CMSG_DATA(cmsg); | |
866 | pi->ipi6_ifindex = ifindex; | |
867 | } | |
868 | ||
869 | return sendmsg_loop(fd, &mh, 0); | |
870 | } | |
871 | ||
623a4c97 | 872 | int manager_send(Manager *m, int fd, int ifindex, int family, const union in_addr_union *addr, uint16_t port, DnsPacket *p) { |
1716f6dc LP |
873 | assert(m); |
874 | assert(fd >= 0); | |
875 | assert(addr); | |
876 | assert(port > 0); | |
877 | assert(p); | |
878 | ||
a2a416f7 LP |
879 | log_debug("Sending %s packet with id %u on interface %i/%s", DNS_PACKET_QR(p) ? "response" : "query", DNS_PACKET_ID(p), ifindex, af_to_name(family)); |
880 | ||
1716f6dc LP |
881 | if (family == AF_INET) |
882 | return manager_ipv4_send(m, fd, ifindex, &addr->in, port, p); | |
883 | else if (family == AF_INET6) | |
884 | return manager_ipv6_send(m, fd, ifindex, &addr->in6, port, p); | |
885 | ||
886 | return -EAFNOSUPPORT; | |
887 | } | |
888 | ||
e1c95994 LP |
889 | uint32_t manager_find_mtu(Manager *m) { |
890 | uint32_t mtu = 0; | |
891 | Link *l; | |
892 | Iterator i; | |
893 | ||
894 | /* If we don't know on which link a DNS packet would be | |
895 | * delivered, let's find the largest MTU that works on all | |
896 | * interfaces we know of */ | |
897 | ||
898 | HASHMAP_FOREACH(l, m->links, i) { | |
899 | if (l->mtu <= 0) | |
900 | continue; | |
901 | ||
902 | if (mtu <= 0 || l->mtu < mtu) | |
903 | mtu = l->mtu; | |
904 | } | |
905 | ||
906 | return mtu; | |
907 | } | |
1716f6dc | 908 | |
623a4c97 | 909 | int manager_find_ifindex(Manager *m, int family, const union in_addr_union *in_addr) { |
ec2c5e43 LP |
910 | LinkAddress *a; |
911 | ||
912 | assert(m); | |
913 | ||
4e945a6f | 914 | a = manager_find_link_address(m, family, in_addr); |
ec2c5e43 LP |
915 | if (a) |
916 | return a->link->ifindex; | |
917 | ||
918 | return 0; | |
919 | } | |
920 | ||
eb60f9cd LP |
921 | void manager_refresh_rrs(Manager *m) { |
922 | Iterator i; | |
923 | Link *l; | |
924 | ||
925 | assert(m); | |
926 | ||
78c6a153 LP |
927 | m->llmnr_host_ipv4_key = dns_resource_key_unref(m->llmnr_host_ipv4_key); |
928 | m->llmnr_host_ipv6_key = dns_resource_key_unref(m->llmnr_host_ipv6_key); | |
eb60f9cd LP |
929 | |
930 | HASHMAP_FOREACH(l, m->links, i) { | |
931 | link_add_rrs(l, true); | |
932 | link_add_rrs(l, false); | |
933 | } | |
934 | } | |
935 | ||
ec2c5e43 LP |
936 | int manager_next_hostname(Manager *m) { |
937 | const char *p; | |
556a2294 | 938 | uint64_t u, a; |
78c6a153 LP |
939 | char *h, *k; |
940 | int r; | |
623a4c97 LP |
941 | |
942 | assert(m); | |
943 | ||
78c6a153 | 944 | p = strchr(m->llmnr_hostname, 0); |
ec2c5e43 LP |
945 | assert(p); |
946 | ||
78c6a153 | 947 | while (p > m->llmnr_hostname) { |
ec2c5e43 LP |
948 | if (!strchr("0123456789", p[-1])) |
949 | break; | |
950 | ||
951 | p--; | |
952 | } | |
953 | ||
954 | if (*p == 0 || safe_atou64(p, &u) < 0 || u <= 0) | |
955 | u = 1; | |
956 | ||
556a2294 LP |
957 | /* Add a random number to the old value. This way we can avoid |
958 | * that two hosts pick the same hostname, win on IPv4 and lose | |
959 | * on IPv6 (or vice versa), and pick the same hostname | |
960 | * replacement hostname, ad infinitum. We still want the | |
961 | * numbers to go up monotonically, hence we just add a random | |
962 | * value 1..10 */ | |
963 | ||
964 | random_bytes(&a, sizeof(a)); | |
965 | u += 1 + a % 10; | |
ec2c5e43 | 966 | |
78c6a153 | 967 | if (asprintf(&h, "%.*s%" PRIu64, (int) (p - m->llmnr_hostname), m->llmnr_hostname, u) < 0) |
ec2c5e43 LP |
968 | return -ENOMEM; |
969 | ||
78c6a153 LP |
970 | r = dns_name_concat(h, "local", &k); |
971 | if (r < 0) { | |
972 | free(h); | |
973 | return r; | |
974 | } | |
975 | ||
976 | log_info("Hostname conflict, changing published hostname from '%s' to '%s'.", m->llmnr_hostname, h); | |
977 | ||
978 | free(m->llmnr_hostname); | |
979 | m->llmnr_hostname = h; | |
ec2c5e43 | 980 | |
78c6a153 LP |
981 | free(m->mdns_hostname); |
982 | m->mdns_hostname = k; | |
ec2c5e43 | 983 | |
eb60f9cd | 984 | manager_refresh_rrs(m); |
623a4c97 LP |
985 | |
986 | return 0; | |
987 | } | |
ec2c5e43 | 988 | |
4e945a6f | 989 | LinkAddress* manager_find_link_address(Manager *m, int family, const union in_addr_union *in_addr) { |
ec2c5e43 LP |
990 | Iterator i; |
991 | Link *l; | |
992 | ||
993 | assert(m); | |
994 | ||
995 | HASHMAP_FOREACH(l, m->links, i) { | |
996 | LinkAddress *a; | |
997 | ||
998 | a = link_find_address(l, family, in_addr); | |
999 | if (a) | |
1000 | return a; | |
1001 | } | |
1002 | ||
1003 | return NULL; | |
1004 | } | |
1005 | ||
a4076574 | 1006 | bool manager_our_packet(Manager *m, DnsPacket *p) { |
ec2c5e43 LP |
1007 | assert(m); |
1008 | assert(p); | |
1009 | ||
4e945a6f | 1010 | return !!manager_find_link_address(m, p->family, &p->sender); |
ec2c5e43 | 1011 | } |
4e945a6f | 1012 | |
a4076574 LP |
1013 | DnsScope* manager_find_scope(Manager *m, DnsPacket *p) { |
1014 | Link *l; | |
1015 | ||
1016 | assert(m); | |
1017 | assert(p); | |
1018 | ||
1019 | l = hashmap_get(m->links, INT_TO_PTR(p->ifindex)); | |
1020 | if (!l) | |
1021 | return NULL; | |
1022 | ||
1023 | if (p->protocol == DNS_PROTOCOL_LLMNR) { | |
1024 | if (p->family == AF_INET) | |
1025 | return l->llmnr_ipv4_scope; | |
1026 | else if (p->family == AF_INET6) | |
1027 | return l->llmnr_ipv6_scope; | |
1028 | } | |
1029 | ||
1030 | return NULL; | |
1031 | } | |
1032 | ||
902bb5d8 LP |
1033 | void manager_verify_all(Manager *m) { |
1034 | DnsScope *s; | |
1035 | ||
1036 | assert(m); | |
1037 | ||
1038 | LIST_FOREACH(scopes, s, m->dns_scopes) | |
1039 | dns_zone_verify_all(&s->zone); | |
1040 | } | |
1041 | ||
78c6a153 | 1042 | int manager_is_own_hostname(Manager *m, const char *name) { |
78c6a153 LP |
1043 | int r; |
1044 | ||
1045 | assert(m); | |
1046 | assert(name); | |
1047 | ||
1048 | if (m->llmnr_hostname) { | |
1049 | r = dns_name_equal(name, m->llmnr_hostname); | |
1050 | if (r != 0) | |
1051 | return r; | |
1052 | } | |
1053 | ||
1054 | if (m->mdns_hostname) | |
1055 | return dns_name_equal(name, m->mdns_hostname); | |
1056 | ||
1057 | return 0; | |
1058 | } | |
1059 | ||
4e945a6f LP |
1060 | static const char* const support_table[_SUPPORT_MAX] = { |
1061 | [SUPPORT_NO] = "no", | |
1062 | [SUPPORT_YES] = "yes", | |
1063 | [SUPPORT_RESOLVE] = "resolve", | |
1064 | }; | |
1065 | DEFINE_STRING_TABLE_LOOKUP(support, Support); |