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Commit | Line | Data |
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db9ecf05 | 1 | /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
091a364c | 2 | |
ca78ad1d | 3 | #include <fcntl.h> |
07630cea LP |
4 | #include <netinet/in.h> |
5 | #include <poll.h> | |
74b2466e | 6 | #include <sys/ioctl.h> |
ca78ad1d ZJS |
7 | #include <sys/stat.h> |
8 | #include <sys/types.h> | |
9 | #include <unistd.h> | |
091a364c | 10 | |
a2a416f7 | 11 | #include "af-list.h" |
b5efdb8a | 12 | #include "alloc-util.h" |
269e4d2d | 13 | #include "bus-polkit.h" |
943ef07c | 14 | #include "dirent-util.h" |
07630cea | 15 | #include "dns-domain.h" |
3ffd4af2 | 16 | #include "fd-util.h" |
ee228be1 | 17 | #include "fileio.h" |
07630cea | 18 | #include "hostname-util.h" |
4917e7c7 | 19 | #include "idn-util.h" |
c004493c | 20 | #include "io-util.h" |
ef118d00 | 21 | #include "missing_network.h" |
20a001bd | 22 | #include "missing_socket.h" |
07630cea | 23 | #include "netlink-util.h" |
822db23c | 24 | #include "ordered-set.h" |
6bedfcbb | 25 | #include "parse-util.h" |
3df3e884 | 26 | #include "random-util.h" |
39d8db04 | 27 | #include "resolved-bus.h" |
07630cea | 28 | #include "resolved-conf.h" |
b30bf55d | 29 | #include "resolved-dns-stub.h" |
cb310866 | 30 | #include "resolved-dnssd.h" |
dd0bc0f1 | 31 | #include "resolved-etc-hosts.h" |
5f402ae8 | 32 | #include "resolved-llmnr.h" |
07630cea | 33 | #include "resolved-manager.h" |
bc7702b0 | 34 | #include "resolved-mdns.h" |
dd0bc0f1 | 35 | #include "resolved-resolv-conf.h" |
9581bb84 | 36 | #include "resolved-varlink.h" |
07630cea | 37 | #include "socket-util.h" |
8b43440b | 38 | #include "string-table.h" |
07630cea LP |
39 | #include "string-util.h" |
40 | #include "utf8.h" | |
74b2466e LP |
41 | |
42 | #define SEND_TIMEOUT_USEC (200 * USEC_PER_MSEC) | |
43 | ||
1c4baffc | 44 | static int manager_process_link(sd_netlink *rtnl, sd_netlink_message *mm, void *userdata) { |
74b2466e LP |
45 | Manager *m = userdata; |
46 | uint16_t type; | |
47 | Link *l; | |
48 | int ifindex, r; | |
49 | ||
50 | assert(rtnl); | |
51 | assert(m); | |
52 | assert(mm); | |
53 | ||
1c4baffc | 54 | r = sd_netlink_message_get_type(mm, &type); |
74b2466e LP |
55 | if (r < 0) |
56 | goto fail; | |
57 | ||
58 | r = sd_rtnl_message_link_get_ifindex(mm, &ifindex); | |
59 | if (r < 0) | |
60 | goto fail; | |
61 | ||
62 | l = hashmap_get(m->links, INT_TO_PTR(ifindex)); | |
63 | ||
64 | switch (type) { | |
65 | ||
a2a416f7 LP |
66 | case RTM_NEWLINK:{ |
67 | bool is_new = !l; | |
74b2466e | 68 | |
a2a416f7 | 69 | if (!l) { |
74b2466e LP |
70 | r = link_new(m, &l, ifindex); |
71 | if (r < 0) | |
72 | goto fail; | |
73 | } | |
74 | ||
943ef07c | 75 | r = link_process_rtnl(l, mm); |
74b2466e LP |
76 | if (r < 0) |
77 | goto fail; | |
78 | ||
943ef07c | 79 | r = link_update(l); |
21d73c87 LP |
80 | if (r < 0) |
81 | goto fail; | |
82 | ||
a2a416f7 | 83 | if (is_new) |
6ff79f76 | 84 | log_debug("Found new link %i/%s", ifindex, l->ifname); |
a2a416f7 | 85 | |
74b2466e | 86 | break; |
a2a416f7 | 87 | } |
74b2466e LP |
88 | |
89 | case RTM_DELLINK: | |
90 | if (l) { | |
6ff79f76 | 91 | log_debug("Removing link %i/%s", l->ifindex, l->ifname); |
943ef07c | 92 | link_remove_user(l); |
74b2466e LP |
93 | link_free(l); |
94 | } | |
95 | ||
96 | break; | |
97 | } | |
98 | ||
99 | return 0; | |
100 | ||
101 | fail: | |
da927ba9 | 102 | log_warning_errno(r, "Failed to process RTNL link message: %m"); |
74b2466e LP |
103 | return 0; |
104 | } | |
105 | ||
1c4baffc | 106 | static int manager_process_address(sd_netlink *rtnl, sd_netlink_message *mm, void *userdata) { |
74b2466e LP |
107 | Manager *m = userdata; |
108 | union in_addr_union address; | |
74b2466e | 109 | uint16_t type; |
0dd25fb9 | 110 | int r, ifindex, family; |
74b2466e LP |
111 | LinkAddress *a; |
112 | Link *l; | |
113 | ||
114 | assert(rtnl); | |
115 | assert(mm); | |
116 | assert(m); | |
117 | ||
1c4baffc | 118 | r = sd_netlink_message_get_type(mm, &type); |
74b2466e LP |
119 | if (r < 0) |
120 | goto fail; | |
121 | ||
122 | r = sd_rtnl_message_addr_get_ifindex(mm, &ifindex); | |
123 | if (r < 0) | |
124 | goto fail; | |
125 | ||
126 | l = hashmap_get(m->links, INT_TO_PTR(ifindex)); | |
127 | if (!l) | |
128 | return 0; | |
129 | ||
130 | r = sd_rtnl_message_addr_get_family(mm, &family); | |
131 | if (r < 0) | |
132 | goto fail; | |
133 | ||
134 | switch (family) { | |
135 | ||
136 | case AF_INET: | |
1c4baffc | 137 | r = sd_netlink_message_read_in_addr(mm, IFA_LOCAL, &address.in); |
74b2466e | 138 | if (r < 0) { |
1c4baffc | 139 | r = sd_netlink_message_read_in_addr(mm, IFA_ADDRESS, &address.in); |
74b2466e LP |
140 | if (r < 0) |
141 | goto fail; | |
142 | } | |
143 | ||
144 | break; | |
145 | ||
146 | case AF_INET6: | |
1c4baffc | 147 | r = sd_netlink_message_read_in6_addr(mm, IFA_LOCAL, &address.in6); |
74b2466e | 148 | if (r < 0) { |
1c4baffc | 149 | r = sd_netlink_message_read_in6_addr(mm, IFA_ADDRESS, &address.in6); |
74b2466e LP |
150 | if (r < 0) |
151 | goto fail; | |
152 | } | |
153 | ||
154 | break; | |
155 | ||
156 | default: | |
157 | return 0; | |
158 | } | |
159 | ||
160 | a = link_find_address(l, family, &address); | |
161 | ||
162 | switch (type) { | |
163 | ||
164 | case RTM_NEWADDR: | |
165 | ||
166 | if (!a) { | |
167 | r = link_address_new(l, &a, family, &address); | |
168 | if (r < 0) | |
169 | return r; | |
170 | } | |
171 | ||
172 | r = link_address_update_rtnl(a, mm); | |
173 | if (r < 0) | |
174 | return r; | |
175 | ||
176 | break; | |
177 | ||
178 | case RTM_DELADDR: | |
3e044c49 | 179 | link_address_free(a); |
74b2466e LP |
180 | break; |
181 | } | |
182 | ||
183 | return 0; | |
184 | ||
185 | fail: | |
da927ba9 | 186 | log_warning_errno(r, "Failed to process RTNL address message: %m"); |
74b2466e LP |
187 | return 0; |
188 | } | |
189 | ||
74b2466e | 190 | static int manager_rtnl_listen(Manager *m) { |
4afd3348 | 191 | _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL; |
1c4baffc | 192 | sd_netlink_message *i; |
74b2466e LP |
193 | int r; |
194 | ||
195 | assert(m); | |
196 | ||
cc98b302 | 197 | /* First, subscribe to interfaces coming and going */ |
1c4baffc | 198 | r = sd_netlink_open(&m->rtnl); |
74b2466e LP |
199 | if (r < 0) |
200 | return r; | |
201 | ||
2d895038 | 202 | r = sd_netlink_attach_event(m->rtnl, m->event, SD_EVENT_PRIORITY_IMPORTANT); |
74b2466e LP |
203 | if (r < 0) |
204 | return r; | |
205 | ||
8190a388 | 206 | r = sd_netlink_add_match(m->rtnl, NULL, RTM_NEWLINK, manager_process_link, NULL, m, "resolve-NEWLINK"); |
74b2466e LP |
207 | if (r < 0) |
208 | return r; | |
209 | ||
8190a388 | 210 | r = sd_netlink_add_match(m->rtnl, NULL, RTM_DELLINK, manager_process_link, NULL, m, "resolve-DELLINK"); |
74b2466e LP |
211 | if (r < 0) |
212 | return r; | |
213 | ||
8190a388 | 214 | r = sd_netlink_add_match(m->rtnl, NULL, RTM_NEWADDR, manager_process_address, NULL, m, "resolve-NEWADDR"); |
74b2466e LP |
215 | if (r < 0) |
216 | return r; | |
091a364c | 217 | |
8190a388 | 218 | r = sd_netlink_add_match(m->rtnl, NULL, RTM_DELADDR, manager_process_address, NULL, m, "resolve-DELADDR"); |
74b2466e LP |
219 | if (r < 0) |
220 | return r; | |
221 | ||
222 | /* Then, enumerate all links */ | |
223 | r = sd_rtnl_message_new_link(m->rtnl, &req, RTM_GETLINK, 0); | |
224 | if (r < 0) | |
225 | return r; | |
226 | ||
1c4baffc | 227 | r = sd_netlink_message_request_dump(req, true); |
74b2466e LP |
228 | if (r < 0) |
229 | return r; | |
230 | ||
1c4baffc | 231 | r = sd_netlink_call(m->rtnl, req, 0, &reply); |
74b2466e LP |
232 | if (r < 0) |
233 | return r; | |
234 | ||
1c4baffc | 235 | for (i = reply; i; i = sd_netlink_message_next(i)) { |
74b2466e LP |
236 | r = manager_process_link(m->rtnl, i, m); |
237 | if (r < 0) | |
238 | return r; | |
239 | } | |
240 | ||
1c4baffc TG |
241 | req = sd_netlink_message_unref(req); |
242 | reply = sd_netlink_message_unref(reply); | |
74b2466e LP |
243 | |
244 | /* Finally, enumerate all addresses, too */ | |
245 | r = sd_rtnl_message_new_addr(m->rtnl, &req, RTM_GETADDR, 0, AF_UNSPEC); | |
246 | if (r < 0) | |
247 | return r; | |
248 | ||
1c4baffc | 249 | r = sd_netlink_message_request_dump(req, true); |
74b2466e LP |
250 | if (r < 0) |
251 | return r; | |
252 | ||
1c4baffc | 253 | r = sd_netlink_call(m->rtnl, req, 0, &reply); |
74b2466e LP |
254 | if (r < 0) |
255 | return r; | |
256 | ||
1c4baffc | 257 | for (i = reply; i; i = sd_netlink_message_next(i)) { |
74b2466e LP |
258 | r = manager_process_address(m->rtnl, i, m); |
259 | if (r < 0) | |
260 | return r; | |
261 | } | |
262 | ||
263 | return r; | |
264 | } | |
265 | ||
266 | static int on_network_event(sd_event_source *s, int fd, uint32_t revents, void *userdata) { | |
267 | Manager *m = userdata; | |
74b2466e LP |
268 | Link *l; |
269 | int r; | |
270 | ||
271 | assert(m); | |
272 | ||
273 | sd_network_monitor_flush(m->network_monitor); | |
274 | ||
90e74a66 | 275 | HASHMAP_FOREACH(l, m->links) { |
943ef07c | 276 | r = link_update(l); |
74b2466e | 277 | if (r < 0) |
da927ba9 | 278 | log_warning_errno(r, "Failed to update monitor information for %i: %m", l->ifindex); |
74b2466e LP |
279 | } |
280 | ||
7207052d | 281 | (void) manager_write_resolv_conf(m); |
5f3340ca | 282 | (void) manager_send_changed(m, "DNS"); |
74b2466e LP |
283 | |
284 | return 0; | |
285 | } | |
286 | ||
287 | static int manager_network_monitor_listen(Manager *m) { | |
288 | int r, fd, events; | |
289 | ||
290 | assert(m); | |
291 | ||
0014a4ad | 292 | r = sd_network_monitor_new(&m->network_monitor, NULL); |
74b2466e LP |
293 | if (r < 0) |
294 | return r; | |
295 | ||
296 | fd = sd_network_monitor_get_fd(m->network_monitor); | |
297 | if (fd < 0) | |
298 | return fd; | |
299 | ||
300 | events = sd_network_monitor_get_events(m->network_monitor); | |
301 | if (events < 0) | |
302 | return events; | |
303 | ||
304 | r = sd_event_add_io(m->event, &m->network_event_source, fd, events, &on_network_event, m); | |
305 | if (r < 0) | |
2d895038 LP |
306 | return r; |
307 | ||
308 | r = sd_event_source_set_priority(m->network_event_source, SD_EVENT_PRIORITY_IMPORTANT+5); | |
309 | if (r < 0) | |
74b2466e LP |
310 | return r; |
311 | ||
aa4a9deb LP |
312 | (void) sd_event_source_set_description(m->network_event_source, "network-monitor"); |
313 | ||
74b2466e LP |
314 | return 0; |
315 | } | |
316 | ||
90df0fbe LP |
317 | static int manager_clock_change_listen(Manager *m); |
318 | ||
319 | static int on_clock_change(sd_event_source *source, int fd, uint32_t revents, void *userdata) { | |
320 | Manager *m = userdata; | |
321 | ||
322 | assert(m); | |
323 | ||
324 | /* The clock has changed, let's flush all caches. Why that? That's because DNSSEC validation takes | |
325 | * the system clock into consideration, and if the clock changes the old validations might have been | |
326 | * wrong. Let's redo all validation with the new, correct time. | |
327 | * | |
328 | * (Also, this is triggered after system suspend, which is also a good reason to drop caches, since | |
329 | * we might be connected to a different network now without this being visible in a dropped link | |
330 | * carrier or so.) */ | |
331 | ||
332 | log_info("Clock change detected. Flushing caches."); | |
333 | manager_flush_caches(m, LOG_DEBUG /* downgrade the functions own log message, since we already logged here at LOG_INFO level */); | |
334 | ||
335 | /* The clock change timerfd is unusable after it triggered once, create a new one. */ | |
336 | return manager_clock_change_listen(m); | |
337 | } | |
338 | ||
339 | static int manager_clock_change_listen(Manager *m) { | |
340 | _cleanup_close_ int fd = -1; | |
341 | int r; | |
342 | ||
343 | assert(m); | |
344 | ||
345 | m->clock_change_event_source = sd_event_source_unref(m->clock_change_event_source); | |
346 | ||
347 | fd = time_change_fd(); | |
348 | if (fd < 0) | |
349 | return log_error_errno(fd, "Failed to allocate clock change timer fd: %m"); | |
350 | ||
351 | r = sd_event_add_io(m->event, &m->clock_change_event_source, fd, EPOLLIN, on_clock_change, m); | |
352 | if (r < 0) | |
353 | return log_error_errno(r, "Failed to create clock change event source: %m"); | |
354 | ||
355 | r = sd_event_source_set_io_fd_own(m->clock_change_event_source, true); | |
356 | if (r < 0) | |
357 | return log_error_errno(r, "Failed to pass ownership of clock fd to event source: %m"); | |
358 | TAKE_FD(fd); | |
359 | ||
360 | (void) sd_event_source_set_description(m->clock_change_event_source, "clock-change"); | |
361 | ||
362 | return 0; | |
363 | } | |
364 | ||
e96de0ce | 365 | static int determine_hostname(char **full_hostname, char **llmnr_hostname, char **mdns_hostname) { |
eb60f9cd | 366 | _cleanup_free_ char *h = NULL, *n = NULL; |
349cc4a5 | 367 | #if HAVE_LIBIDN2 |
87057e24 | 368 | _cleanup_free_ char *utf8 = NULL; |
349cc4a5 | 369 | #elif HAVE_LIBIDN |
87057e24 ZJS |
370 | int k; |
371 | #endif | |
78c6a153 | 372 | char label[DNS_LABEL_MAX]; |
87057e24 ZJS |
373 | const char *p, *decoded; |
374 | int r; | |
eb60f9cd | 375 | |
e96de0ce | 376 | assert(full_hostname); |
78c6a153 LP |
377 | assert(llmnr_hostname); |
378 | assert(mdns_hostname); | |
379 | ||
a25b0dc8 | 380 | /* Extract and normalize the first label of the locally configured hostname, and check it's not "localhost". */ |
eb60f9cd | 381 | |
a25b0dc8 LP |
382 | r = gethostname_strict(&h); |
383 | if (r < 0) | |
384 | return log_debug_errno(r, "Can't determine system hostname: %m"); | |
eb60f9cd | 385 | |
78c6a153 | 386 | p = h; |
7470cc4c | 387 | r = dns_label_unescape(&p, label, sizeof label, 0); |
78c6a153 | 388 | if (r < 0) |
38b38500 | 389 | return log_error_errno(r, "Failed to unescape hostname: %m"); |
baaa35ad ZJS |
390 | if (r == 0) |
391 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
392 | "Couldn't find a single label in hostname."); | |
78c6a153 | 393 | |
4917e7c7 LP |
394 | #if HAVE_LIBIDN || HAVE_LIBIDN2 |
395 | r = dlopen_idn(); | |
396 | if (r < 0) { | |
397 | log_debug_errno(r, "Failed to initialize IDN support, ignoring: %m"); | |
398 | decoded = label; /* no decoding */ | |
399 | } else | |
400 | #endif | |
401 | { | |
349cc4a5 | 402 | #if HAVE_LIBIDN2 |
4917e7c7 LP |
403 | r = sym_idn2_to_unicode_8z8z(label, &utf8, 0); |
404 | if (r != IDN2_OK) | |
405 | return log_error_errno(SYNTHETIC_ERRNO(EUCLEAN), | |
406 | "Failed to undo IDNA: %s", sym_idn2_strerror(r)); | |
407 | assert(utf8_is_valid(utf8)); | |
408 | ||
409 | r = strlen(utf8); | |
410 | decoded = utf8; | |
349cc4a5 | 411 | #elif HAVE_LIBIDN |
4917e7c7 LP |
412 | k = dns_label_undo_idna(label, r, label, sizeof label); |
413 | if (k < 0) | |
414 | return log_error_errno(k, "Failed to undo IDNA: %m"); | |
415 | if (k > 0) | |
416 | r = k; | |
417 | ||
418 | if (!utf8_is_valid(label)) | |
419 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
420 | "System hostname is not UTF-8 clean."); | |
421 | decoded = label; | |
87057e24 | 422 | #else |
4917e7c7 | 423 | decoded = label; /* no decoding */ |
87057e24 | 424 | #endif |
4917e7c7 | 425 | } |
eb60f9cd | 426 | |
87057e24 | 427 | r = dns_label_escape_new(decoded, r, &n); |
78c6a153 | 428 | if (r < 0) |
38b38500 | 429 | return log_error_errno(r, "Failed to escape hostname: %m"); |
78c6a153 | 430 | |
baaa35ad ZJS |
431 | if (is_localhost(n)) |
432 | return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), | |
433 | "System hostname is 'localhost', ignoring."); | |
eb60f9cd | 434 | |
7470cc4c | 435 | r = dns_name_concat(n, "local", 0, mdns_hostname); |
78c6a153 LP |
436 | if (r < 0) |
437 | return log_error_errno(r, "Failed to determine mDNS hostname: %m"); | |
438 | ||
ae2a15bc LP |
439 | *llmnr_hostname = TAKE_PTR(n); |
440 | *full_hostname = TAKE_PTR(h); | |
e96de0ce | 441 | |
eb60f9cd LP |
442 | return 0; |
443 | } | |
444 | ||
05c6f341 | 445 | static char* fallback_hostname(void) { |
a25b0dc8 | 446 | |
05c6f341 ZJS |
447 | /* Determine the fall back hostname. For exposing this system to the outside world, we cannot have it |
448 | * to be "localhost" even if that's the default hostname. In this case, let's revert to "linux" | |
449 | * instead. */ | |
a25b0dc8 | 450 | |
05c6f341 ZJS |
451 | _cleanup_free_ char *n = get_default_hostname(); |
452 | if (!n) | |
453 | return NULL; | |
a25b0dc8 | 454 | |
05c6f341 ZJS |
455 | if (is_localhost(n)) |
456 | return strdup("linux"); | |
457 | ||
458 | return TAKE_PTR(n); | |
a25b0dc8 LP |
459 | } |
460 | ||
461 | static int make_fallback_hostnames(char **full_hostname, char **llmnr_hostname, char **mdns_hostname) { | |
05c6f341 ZJS |
462 | _cleanup_free_ char *h = NULL, *n = NULL, *m = NULL; |
463 | char label[DNS_LABEL_MAX]; | |
a25b0dc8 LP |
464 | const char *p; |
465 | int r; | |
466 | ||
467 | assert(full_hostname); | |
468 | assert(llmnr_hostname); | |
469 | assert(mdns_hostname); | |
470 | ||
05c6f341 ZJS |
471 | p = h = fallback_hostname(); |
472 | if (!h) | |
473 | return log_oom(); | |
474 | ||
7470cc4c | 475 | r = dns_label_unescape(&p, label, sizeof label, 0); |
a25b0dc8 | 476 | if (r < 0) |
38b38500 | 477 | return log_error_errno(r, "Failed to unescape fallback hostname: %m"); |
a25b0dc8 LP |
478 | |
479 | assert(r > 0); /* The fallback hostname must have at least one label */ | |
480 | ||
481 | r = dns_label_escape_new(label, r, &n); | |
482 | if (r < 0) | |
483 | return log_error_errno(r, "Failed to escape fallback hostname: %m"); | |
484 | ||
7470cc4c | 485 | r = dns_name_concat(n, "local", 0, &m); |
a25b0dc8 LP |
486 | if (r < 0) |
487 | return log_error_errno(r, "Failed to concatenate mDNS hostname: %m"); | |
488 | ||
ae2a15bc LP |
489 | *llmnr_hostname = TAKE_PTR(n); |
490 | *mdns_hostname = TAKE_PTR(m); | |
05c6f341 | 491 | *full_hostname = TAKE_PTR(h); |
a25b0dc8 LP |
492 | |
493 | return 0; | |
494 | } | |
495 | ||
eb60f9cd | 496 | static int on_hostname_change(sd_event_source *es, int fd, uint32_t revents, void *userdata) { |
e96de0ce | 497 | _cleanup_free_ char *full_hostname = NULL, *llmnr_hostname = NULL, *mdns_hostname = NULL; |
eb60f9cd | 498 | Manager *m = userdata; |
86c0411e | 499 | bool llmnr_hostname_changed; |
eb60f9cd LP |
500 | int r; |
501 | ||
502 | assert(m); | |
503 | ||
e96de0ce | 504 | r = determine_hostname(&full_hostname, &llmnr_hostname, &mdns_hostname); |
eb60f9cd LP |
505 | if (r < 0) |
506 | return 0; /* ignore invalid hostnames */ | |
507 | ||
86c0411e | 508 | llmnr_hostname_changed = !streq(llmnr_hostname, m->llmnr_hostname); |
e96de0ce | 509 | if (streq(full_hostname, m->full_hostname) && |
86c0411e | 510 | !llmnr_hostname_changed && |
e96de0ce | 511 | streq(mdns_hostname, m->mdns_hostname)) |
eb60f9cd LP |
512 | return 0; |
513 | ||
e96de0ce | 514 | log_info("System hostname changed to '%s'.", full_hostname); |
78c6a153 | 515 | |
e96de0ce LP |
516 | free_and_replace(m->full_hostname, full_hostname); |
517 | free_and_replace(m->llmnr_hostname, llmnr_hostname); | |
518 | free_and_replace(m->mdns_hostname, mdns_hostname); | |
eb60f9cd LP |
519 | |
520 | manager_refresh_rrs(m); | |
86c0411e | 521 | (void) manager_send_changed(m, "LLMNRHostname"); |
eb60f9cd LP |
522 | |
523 | return 0; | |
524 | } | |
525 | ||
526 | static int manager_watch_hostname(Manager *m) { | |
eb60f9cd LP |
527 | int r; |
528 | ||
529 | assert(m); | |
530 | ||
db4a47e9 LP |
531 | m->hostname_fd = open("/proc/sys/kernel/hostname", |
532 | O_RDONLY|O_CLOEXEC|O_NONBLOCK|O_NOCTTY); | |
eb60f9cd | 533 | if (m->hostname_fd < 0) { |
56f64d95 | 534 | log_warning_errno(errno, "Failed to watch hostname: %m"); |
eb60f9cd LP |
535 | return 0; |
536 | } | |
537 | ||
538 | r = sd_event_add_io(m->event, &m->hostname_event_source, m->hostname_fd, 0, on_hostname_change, m); | |
539 | if (r < 0) { | |
540 | if (r == -EPERM) | |
541 | /* kernels prior to 3.2 don't support polling this file. Ignore the failure. */ | |
542 | m->hostname_fd = safe_close(m->hostname_fd); | |
8d3d7072 MS |
543 | else |
544 | return log_error_errno(r, "Failed to add hostname event source: %m"); | |
eb60f9cd LP |
545 | } |
546 | ||
aa4a9deb LP |
547 | (void) sd_event_source_set_description(m->hostname_event_source, "hostname"); |
548 | ||
e96de0ce | 549 | r = determine_hostname(&m->full_hostname, &m->llmnr_hostname, &m->mdns_hostname); |
eb60f9cd | 550 | if (r < 0) { |
999c2486 LP |
551 | _cleanup_free_ char *d = NULL; |
552 | ||
553 | d = fallback_hostname(); | |
554 | if (!d) | |
555 | return log_oom(); | |
556 | ||
557 | log_info("Defaulting to hostname '%s'.", d); | |
78c6a153 | 558 | |
a25b0dc8 LP |
559 | r = make_fallback_hostnames(&m->full_hostname, &m->llmnr_hostname, &m->mdns_hostname); |
560 | if (r < 0) | |
561 | return r; | |
eb60f9cd | 562 | } else |
e96de0ce | 563 | log_info("Using system hostname '%s'.", m->full_hostname); |
eb60f9cd LP |
564 | |
565 | return 0; | |
566 | } | |
567 | ||
4d506d6b LP |
568 | static int manager_sigusr1(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { |
569 | _cleanup_free_ char *buffer = NULL; | |
570 | _cleanup_fclose_ FILE *f = NULL; | |
571 | Manager *m = userdata; | |
cf84484a | 572 | DnsServer *server; |
4d506d6b LP |
573 | size_t size = 0; |
574 | DnsScope *scope; | |
cf84484a | 575 | Link *l; |
4d506d6b LP |
576 | |
577 | assert(s); | |
578 | assert(si); | |
579 | assert(m); | |
580 | ||
2fe21124 | 581 | f = open_memstream_unlocked(&buffer, &size); |
4d506d6b LP |
582 | if (!f) |
583 | return log_oom(); | |
584 | ||
585 | LIST_FOREACH(scopes, scope, m->dns_scopes) | |
586 | dns_scope_dump(scope, f); | |
587 | ||
cf84484a LP |
588 | LIST_FOREACH(servers, server, m->dns_servers) |
589 | dns_server_dump(server, f); | |
590 | LIST_FOREACH(servers, server, m->fallback_dns_servers) | |
591 | dns_server_dump(server, f); | |
90e74a66 | 592 | HASHMAP_FOREACH(l, m->links) |
cf84484a LP |
593 | LIST_FOREACH(servers, server, l->dns_servers) |
594 | dns_server_dump(server, f); | |
595 | ||
4d506d6b LP |
596 | if (fflush_and_check(f) < 0) |
597 | return log_oom(); | |
598 | ||
599 | log_dump(LOG_INFO, buffer); | |
600 | return 0; | |
601 | } | |
602 | ||
bc81447e LP |
603 | static int manager_sigusr2(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { |
604 | Manager *m = userdata; | |
bc81447e LP |
605 | |
606 | assert(s); | |
607 | assert(si); | |
608 | assert(m); | |
609 | ||
90df0fbe | 610 | manager_flush_caches(m, LOG_INFO); |
ba35662f | 611 | |
bc81447e LP |
612 | return 0; |
613 | } | |
614 | ||
d55b0463 LP |
615 | static int manager_sigrtmin1(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { |
616 | Manager *m = userdata; | |
617 | ||
618 | assert(s); | |
619 | assert(si); | |
620 | assert(m); | |
621 | ||
622 | manager_reset_server_features(m); | |
623 | return 0; | |
624 | } | |
625 | ||
091a364c | 626 | int manager_new(Manager **ret) { |
74b2466e | 627 | _cleanup_(manager_freep) Manager *m = NULL; |
091a364c TG |
628 | int r; |
629 | ||
c92e531c LP |
630 | assert(ret); |
631 | ||
f55f2dce | 632 | m = new(Manager, 1); |
091a364c TG |
633 | if (!m) |
634 | return -ENOMEM; | |
635 | ||
f55f2dce YW |
636 | *m = (Manager) { |
637 | .llmnr_ipv4_udp_fd = -1, | |
638 | .llmnr_ipv6_udp_fd = -1, | |
639 | .llmnr_ipv4_tcp_fd = -1, | |
640 | .llmnr_ipv6_tcp_fd = -1, | |
641 | .mdns_ipv4_fd = -1, | |
642 | .mdns_ipv6_fd = -1, | |
f55f2dce YW |
643 | .hostname_fd = -1, |
644 | ||
3614df05 ZJS |
645 | .llmnr_support = DEFAULT_LLMNR_MODE, |
646 | .mdns_support = DEFAULT_MDNS_MODE, | |
f55f2dce YW |
647 | .dnssec_mode = DEFAULT_DNSSEC_MODE, |
648 | .dns_over_tls_mode = DEFAULT_DNS_OVER_TLS_MODE, | |
37d7a7d9 | 649 | .enable_cache = DNS_CACHE_MODE_YES, |
4b987478 | 650 | .dns_stub_listener_mode = DNS_STUB_LISTENER_YES, |
f55f2dce YW |
651 | .read_resolv_conf = true, |
652 | .need_builtin_fallbacks = true, | |
653 | .etc_hosts_last = USEC_INFINITY, | |
f55f2dce YW |
654 | .read_etc_hosts = true, |
655 | }; | |
091a364c | 656 | |
0d2cd476 LP |
657 | r = dns_trust_anchor_load(&m->trust_anchor); |
658 | if (r < 0) | |
659 | return r; | |
660 | ||
ad6c0475 LP |
661 | r = manager_parse_config_file(m); |
662 | if (r < 0) | |
5ce497b5 | 663 | log_warning_errno(r, "Failed to parse configuration file: %m"); |
ad6c0475 | 664 | |
e22c5b20 | 665 | #if ENABLE_DNS_OVER_TLS |
71a681ae IT |
666 | r = dnstls_manager_init(m); |
667 | if (r < 0) | |
668 | return r; | |
e22c5b20 IT |
669 | #endif |
670 | ||
091a364c TG |
671 | r = sd_event_default(&m->event); |
672 | if (r < 0) | |
673 | return r; | |
674 | ||
1ae17292 YW |
675 | (void) sd_event_add_signal(m->event, NULL, SIGTERM, NULL, NULL); |
676 | (void) sd_event_add_signal(m->event, NULL, SIGINT, NULL, NULL); | |
091a364c | 677 | |
1ae17292 | 678 | (void) sd_event_set_watchdog(m->event, true); |
091a364c | 679 | |
eb60f9cd LP |
680 | r = manager_watch_hostname(m); |
681 | if (r < 0) | |
682 | return r; | |
683 | ||
6501dd31 DR |
684 | r = dnssd_load(m); |
685 | if (r < 0) | |
686 | log_warning_errno(r, "Failed to load DNS-SD configuration files: %m"); | |
687 | ||
1716f6dc | 688 | r = dns_scope_new(m, &m->unicast_scope, NULL, DNS_PROTOCOL_DNS, AF_UNSPEC); |
74b2466e LP |
689 | if (r < 0) |
690 | return r; | |
691 | ||
692 | r = manager_network_monitor_listen(m); | |
693 | if (r < 0) | |
694 | return r; | |
695 | ||
696 | r = manager_rtnl_listen(m); | |
697 | if (r < 0) | |
698 | return r; | |
699 | ||
90df0fbe LP |
700 | r = manager_clock_change_listen(m); |
701 | if (r < 0) | |
702 | return r; | |
703 | ||
74b2466e LP |
704 | r = manager_connect_bus(m); |
705 | if (r < 0) | |
706 | return r; | |
707 | ||
4d506d6b | 708 | (void) sd_event_add_signal(m->event, &m->sigusr1_event_source, SIGUSR1, manager_sigusr1, m); |
bc81447e | 709 | (void) sd_event_add_signal(m->event, &m->sigusr2_event_source, SIGUSR2, manager_sigusr2, m); |
d55b0463 | 710 | (void) sd_event_add_signal(m->event, &m->sigrtmin1_event_source, SIGRTMIN+1, manager_sigrtmin1, m); |
4d506d6b | 711 | |
943ef07c LP |
712 | manager_cleanup_saved_user(m); |
713 | ||
1cc6c93a | 714 | *ret = TAKE_PTR(m); |
091a364c TG |
715 | |
716 | return 0; | |
717 | } | |
718 | ||
edc501d4 LP |
719 | int manager_start(Manager *m) { |
720 | int r; | |
721 | ||
722 | assert(m); | |
723 | ||
b30bf55d LP |
724 | r = manager_dns_stub_start(m); |
725 | if (r < 0) | |
726 | return r; | |
727 | ||
9581bb84 LP |
728 | r = manager_varlink_init(m); |
729 | if (r < 0) | |
730 | return r; | |
731 | ||
edc501d4 LP |
732 | return 0; |
733 | } | |
734 | ||
74b2466e LP |
735 | Manager *manager_free(Manager *m) { |
736 | Link *l; | |
6501dd31 | 737 | DnssdService *s; |
091a364c TG |
738 | |
739 | if (!m) | |
74b2466e LP |
740 | return NULL; |
741 | ||
4b95f179 LP |
742 | dns_server_unlink_all(m->dns_servers); |
743 | dns_server_unlink_all(m->fallback_dns_servers); | |
a51c1048 LP |
744 | dns_search_domain_unlink_all(m->search_domains); |
745 | ||
74b2466e LP |
746 | while ((l = hashmap_first(m->links))) |
747 | link_free(l); | |
f0e15467 LP |
748 | |
749 | while (m->dns_queries) | |
750 | dns_query_free(m->dns_queries); | |
74b2466e | 751 | |
bde69bbd LP |
752 | m->stub_queries_by_packet = hashmap_free(m->stub_queries_by_packet); |
753 | ||
cab5b059 LP |
754 | dns_scope_free(m->unicast_scope); |
755 | ||
b30bf55d LP |
756 | /* At this point only orphaned streams should remain. All others should have been freed already by their |
757 | * owners */ | |
758 | while (m->dns_streams) | |
759 | dns_stream_unref(m->dns_streams); | |
760 | ||
e22c5b20 IT |
761 | #if ENABLE_DNS_OVER_TLS |
762 | dnstls_manager_free(m); | |
763 | #endif | |
764 | ||
f0e15467 LP |
765 | hashmap_free(m->links); |
766 | hashmap_free(m->dns_transactions); | |
767 | ||
096b6773 LP |
768 | sd_event_source_unref(m->network_event_source); |
769 | sd_network_monitor_unref(m->network_monitor); | |
091a364c | 770 | |
a564ca2f LP |
771 | sd_netlink_unref(m->rtnl); |
772 | sd_event_source_unref(m->rtnl_event_source); | |
90df0fbe | 773 | sd_event_source_unref(m->clock_change_event_source); |
a564ca2f | 774 | |
edc501d4 | 775 | manager_llmnr_stop(m); |
bc7702b0 | 776 | manager_mdns_stop(m); |
b30bf55d | 777 | manager_dns_stub_stop(m); |
9581bb84 | 778 | manager_varlink_done(m); |
623a4c97 | 779 | |
80710ade LP |
780 | manager_socket_graveyard_clear(m); |
781 | ||
46505826 | 782 | ordered_set_free(m->dns_extra_stub_listeners); |
1f05101f | 783 | |
2400ae29 YW |
784 | bus_verify_polkit_async_registry_free(m->polkit_registry); |
785 | ||
92e31da1 | 786 | sd_bus_flush_close_unref(m->bus); |
091a364c | 787 | |
4d506d6b | 788 | sd_event_source_unref(m->sigusr1_event_source); |
bc81447e | 789 | sd_event_source_unref(m->sigusr2_event_source); |
d55b0463 | 790 | sd_event_source_unref(m->sigrtmin1_event_source); |
4d506d6b | 791 | |
78c6a153 LP |
792 | dns_resource_key_unref(m->llmnr_host_ipv4_key); |
793 | dns_resource_key_unref(m->llmnr_host_ipv6_key); | |
400cb36e DR |
794 | dns_resource_key_unref(m->mdns_host_ipv4_key); |
795 | dns_resource_key_unref(m->mdns_host_ipv6_key); | |
eb60f9cd | 796 | |
eb60f9cd | 797 | sd_event_source_unref(m->hostname_event_source); |
d9fcf2ba | 798 | safe_close(m->hostname_fd); |
e96de0ce | 799 | |
f2ec080e ZJS |
800 | sd_event_unref(m->event); |
801 | ||
e96de0ce | 802 | free(m->full_hostname); |
78c6a153 LP |
803 | free(m->llmnr_hostname); |
804 | free(m->mdns_hostname); | |
eb60f9cd | 805 | |
6501dd31 DR |
806 | while ((s = hashmap_first(m->dnssd_services))) |
807 | dnssd_service_free(s); | |
808 | hashmap_free(m->dnssd_services); | |
809 | ||
0d2cd476 | 810 | dns_trust_anchor_flush(&m->trust_anchor); |
dd0bc0f1 | 811 | manager_etc_hosts_flush(m); |
0d2cd476 | 812 | |
6b430fdb | 813 | return mfree(m); |
091a364c TG |
814 | } |
815 | ||
1716f6dc | 816 | int manager_recv(Manager *m, int fd, DnsProtocol protocol, DnsPacket **ret) { |
74b2466e | 817 | _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL; |
fb29cdbe LP |
818 | CMSG_BUFFER_TYPE(CMSG_SPACE(MAXSIZE(struct in_pktinfo, struct in6_pktinfo)) |
819 | + CMSG_SPACE(int) /* ttl/hoplimit */ | |
820 | + EXTRA_CMSG_SPACE /* kernel appears to require extra buffer space */) control; | |
1716f6dc | 821 | union sockaddr_union sa; |
74b2466e | 822 | struct iovec iov; |
f55f2dce YW |
823 | struct msghdr mh = { |
824 | .msg_name = &sa.sa, | |
825 | .msg_namelen = sizeof(sa), | |
826 | .msg_iov = &iov, | |
827 | .msg_iovlen = 1, | |
828 | .msg_control = &control, | |
829 | .msg_controllen = sizeof(control), | |
830 | }; | |
831 | struct cmsghdr *cmsg; | |
4edc2c9b LP |
832 | ssize_t ms, l; |
833 | int r; | |
74b2466e LP |
834 | |
835 | assert(m); | |
1716f6dc | 836 | assert(fd >= 0); |
74b2466e LP |
837 | assert(ret); |
838 | ||
4edc2c9b | 839 | ms = next_datagram_size_fd(fd); |
74b2466e | 840 | if (ms < 0) |
4edc2c9b | 841 | return ms; |
74b2466e | 842 | |
51027656 | 843 | r = dns_packet_new(&p, protocol, ms, DNS_PACKET_SIZE_MAX); |
74b2466e LP |
844 | if (r < 0) |
845 | return r; | |
846 | ||
cb310866 | 847 | iov = IOVEC_MAKE(DNS_PACKET_DATA(p), p->allocated); |
74b2466e | 848 | |
3691bcf3 LP |
849 | l = recvmsg_safe(fd, &mh, 0); |
850 | if (IN_SET(l, -EAGAIN, -EINTR)) | |
851 | return 0; | |
d7a0f1f4 | 852 | if (l <= 0) |
3691bcf3 | 853 | return l; |
091a364c | 854 | |
1716f6dc LP |
855 | assert(!(mh.msg_flags & MSG_TRUNC)); |
856 | ||
74b2466e | 857 | p->size = (size_t) l; |
091a364c | 858 | |
1716f6dc | 859 | p->family = sa.sa.sa_family; |
623a4c97 LP |
860 | p->ipproto = IPPROTO_UDP; |
861 | if (p->family == AF_INET) { | |
1716f6dc | 862 | p->sender.in = sa.in.sin_addr; |
623a4c97 LP |
863 | p->sender_port = be16toh(sa.in.sin_port); |
864 | } else if (p->family == AF_INET6) { | |
1716f6dc | 865 | p->sender.in6 = sa.in6.sin6_addr; |
623a4c97 LP |
866 | p->sender_port = be16toh(sa.in6.sin6_port); |
867 | p->ifindex = sa.in6.sin6_scope_id; | |
868 | } else | |
1716f6dc | 869 | return -EAFNOSUPPORT; |
74b2466e | 870 | |
5777c613 LP |
871 | p->timestamp = now(clock_boottime_or_monotonic()); |
872 | ||
2a1288ff | 873 | CMSG_FOREACH(cmsg, &mh) { |
74b2466e | 874 | |
1716f6dc LP |
875 | if (cmsg->cmsg_level == IPPROTO_IPV6) { |
876 | assert(p->family == AF_INET6); | |
74b2466e | 877 | |
1716f6dc | 878 | switch (cmsg->cmsg_type) { |
74b2466e | 879 | |
1716f6dc LP |
880 | case IPV6_PKTINFO: { |
881 | struct in6_pktinfo *i = (struct in6_pktinfo*) CMSG_DATA(cmsg); | |
74b2466e | 882 | |
623a4c97 LP |
883 | if (p->ifindex <= 0) |
884 | p->ifindex = i->ipi6_ifindex; | |
885 | ||
1716f6dc LP |
886 | p->destination.in6 = i->ipi6_addr; |
887 | break; | |
888 | } | |
74b2466e | 889 | |
1716f6dc LP |
890 | case IPV6_HOPLIMIT: |
891 | p->ttl = *(int *) CMSG_DATA(cmsg); | |
892 | break; | |
74b2466e | 893 | |
20a001bd LP |
894 | case IPV6_RECVFRAGSIZE: |
895 | p->fragsize = *(int *) CMSG_DATA(cmsg); | |
896 | break; | |
1716f6dc LP |
897 | } |
898 | } else if (cmsg->cmsg_level == IPPROTO_IP) { | |
899 | assert(p->family == AF_INET); | |
74b2466e | 900 | |
1716f6dc | 901 | switch (cmsg->cmsg_type) { |
74b2466e | 902 | |
1716f6dc LP |
903 | case IP_PKTINFO: { |
904 | struct in_pktinfo *i = (struct in_pktinfo*) CMSG_DATA(cmsg); | |
091a364c | 905 | |
623a4c97 LP |
906 | if (p->ifindex <= 0) |
907 | p->ifindex = i->ipi_ifindex; | |
908 | ||
1716f6dc LP |
909 | p->destination.in = i->ipi_addr; |
910 | break; | |
911 | } | |
74b2466e | 912 | |
623a4c97 | 913 | case IP_TTL: |
1716f6dc LP |
914 | p->ttl = *(int *) CMSG_DATA(cmsg); |
915 | break; | |
20a001bd LP |
916 | |
917 | case IP_RECVFRAGSIZE: | |
918 | p->fragsize = *(int *) CMSG_DATA(cmsg); | |
919 | break; | |
1716f6dc LP |
920 | } |
921 | } | |
922 | } | |
74b2466e | 923 | |
623a4c97 LP |
924 | /* The Linux kernel sets the interface index to the loopback |
925 | * device if the packet came from the local host since it | |
926 | * avoids the routing table in such a case. Let's unset the | |
927 | * interface index in such a case. */ | |
a5f03596 | 928 | if (p->ifindex == LOOPBACK_IFINDEX) |
623a4c97 LP |
929 | p->ifindex = 0; |
930 | ||
86ad4cd7 TG |
931 | if (protocol != DNS_PROTOCOL_DNS) { |
932 | /* If we don't know the interface index still, we look for the | |
933 | * first local interface with a matching address. Yuck! */ | |
934 | if (p->ifindex <= 0) | |
935 | p->ifindex = manager_find_ifindex(m, p->family, &p->destination); | |
936 | } | |
623a4c97 | 937 | |
f7155840 LP |
938 | log_debug("Received %s UDP packet of size %zu, ifindex=%i, ttl=%i, fragsize=%zu", |
939 | dns_protocol_to_string(protocol), p->size, p->ifindex, p->ttl, p->fragsize); | |
74b2466e | 940 | |
f7155840 | 941 | *ret = TAKE_PTR(p); |
74b2466e LP |
942 | return 1; |
943 | } | |
944 | ||
74b2466e LP |
945 | static int sendmsg_loop(int fd, struct msghdr *mh, int flags) { |
946 | int r; | |
947 | ||
948 | assert(fd >= 0); | |
949 | assert(mh); | |
950 | ||
951 | for (;;) { | |
952 | if (sendmsg(fd, mh, flags) >= 0) | |
953 | return 0; | |
954 | ||
955 | if (errno == EINTR) | |
956 | continue; | |
957 | ||
958 | if (errno != EAGAIN) | |
959 | return -errno; | |
960 | ||
961 | r = fd_wait_for_event(fd, POLLOUT, SEND_TIMEOUT_USEC); | |
962 | if (r < 0) | |
963 | return r; | |
964 | if (r == 0) | |
965 | return -ETIMEDOUT; | |
966 | } | |
967 | } | |
968 | ||
72290734 TG |
969 | static int write_loop(int fd, void *message, size_t length) { |
970 | int r; | |
971 | ||
972 | assert(fd >= 0); | |
973 | assert(message); | |
974 | ||
975 | for (;;) { | |
976 | if (write(fd, message, length) >= 0) | |
977 | return 0; | |
978 | ||
979 | if (errno == EINTR) | |
980 | continue; | |
981 | ||
982 | if (errno != EAGAIN) | |
983 | return -errno; | |
984 | ||
985 | r = fd_wait_for_event(fd, POLLOUT, SEND_TIMEOUT_USEC); | |
986 | if (r < 0) | |
987 | return r; | |
988 | if (r == 0) | |
989 | return -ETIMEDOUT; | |
990 | } | |
991 | } | |
992 | ||
993 | int manager_write(Manager *m, int fd, DnsPacket *p) { | |
994 | int r; | |
995 | ||
76f77229 LP |
996 | log_debug("Sending %s%s packet with id %" PRIu16 " of size %zu.", |
997 | DNS_PACKET_TC(p) ? "truncated (!) " : "", | |
998 | DNS_PACKET_QR(p) ? "response" : "query", | |
999 | DNS_PACKET_ID(p), | |
1000 | p->size); | |
72290734 TG |
1001 | |
1002 | r = write_loop(fd, DNS_PACKET_DATA(p), p->size); | |
1003 | if (r < 0) | |
1004 | return r; | |
1005 | ||
1006 | return 0; | |
1007 | } | |
1008 | ||
b30bf55d LP |
1009 | static int manager_ipv4_send( |
1010 | Manager *m, | |
1011 | int fd, | |
1012 | int ifindex, | |
1013 | const struct in_addr *destination, | |
1014 | uint16_t port, | |
1015 | const struct in_addr *source, | |
1016 | DnsPacket *p) { | |
fb29cdbe LP |
1017 | |
1018 | CMSG_BUFFER_TYPE(CMSG_SPACE(sizeof(struct in_pktinfo))) control = {}; | |
f55f2dce | 1019 | union sockaddr_union sa; |
74b2466e | 1020 | struct iovec iov; |
f55f2dce YW |
1021 | struct msghdr mh = { |
1022 | .msg_iov = &iov, | |
1023 | .msg_iovlen = 1, | |
1024 | .msg_name = &sa.sa, | |
1025 | .msg_namelen = sizeof(sa.in), | |
1026 | }; | |
74b2466e LP |
1027 | |
1028 | assert(m); | |
1716f6dc | 1029 | assert(fd >= 0); |
b30bf55d | 1030 | assert(destination); |
1716f6dc | 1031 | assert(port > 0); |
74b2466e LP |
1032 | assert(p); |
1033 | ||
cb310866 | 1034 | iov = IOVEC_MAKE(DNS_PACKET_DATA(p), p->size); |
091a364c | 1035 | |
f55f2dce YW |
1036 | sa = (union sockaddr_union) { |
1037 | .in.sin_family = AF_INET, | |
1038 | .in.sin_addr = *destination, | |
1039 | .in.sin_port = htobe16(port), | |
1040 | }; | |
091a364c | 1041 | |
74b2466e LP |
1042 | if (ifindex > 0) { |
1043 | struct cmsghdr *cmsg; | |
1044 | struct in_pktinfo *pi; | |
1045 | ||
1716f6dc | 1046 | mh.msg_control = &control; |
a258f491 | 1047 | mh.msg_controllen = sizeof(control); |
74b2466e LP |
1048 | |
1049 | cmsg = CMSG_FIRSTHDR(&mh); | |
a258f491 | 1050 | cmsg->cmsg_len = CMSG_LEN(sizeof(struct in_pktinfo)); |
74b2466e LP |
1051 | cmsg->cmsg_level = IPPROTO_IP; |
1052 | cmsg->cmsg_type = IP_PKTINFO; | |
1053 | ||
1054 | pi = (struct in_pktinfo*) CMSG_DATA(cmsg); | |
1055 | pi->ipi_ifindex = ifindex; | |
b30bf55d LP |
1056 | |
1057 | if (source) | |
1058 | pi->ipi_spec_dst = *source; | |
74b2466e LP |
1059 | } |
1060 | ||
1061 | return sendmsg_loop(fd, &mh, 0); | |
1062 | } | |
1063 | ||
b30bf55d LP |
1064 | static int manager_ipv6_send( |
1065 | Manager *m, | |
1066 | int fd, | |
1067 | int ifindex, | |
1068 | const struct in6_addr *destination, | |
1069 | uint16_t port, | |
1070 | const struct in6_addr *source, | |
1071 | DnsPacket *p) { | |
1072 | ||
fb29cdbe | 1073 | CMSG_BUFFER_TYPE(CMSG_SPACE(sizeof(struct in6_pktinfo))) control = {}; |
f55f2dce | 1074 | union sockaddr_union sa; |
74b2466e | 1075 | struct iovec iov; |
f55f2dce YW |
1076 | struct msghdr mh = { |
1077 | .msg_iov = &iov, | |
1078 | .msg_iovlen = 1, | |
1079 | .msg_name = &sa.sa, | |
1080 | .msg_namelen = sizeof(sa.in6), | |
1081 | }; | |
74b2466e LP |
1082 | |
1083 | assert(m); | |
1716f6dc | 1084 | assert(fd >= 0); |
b30bf55d | 1085 | assert(destination); |
1716f6dc | 1086 | assert(port > 0); |
74b2466e LP |
1087 | assert(p); |
1088 | ||
cb310866 | 1089 | iov = IOVEC_MAKE(DNS_PACKET_DATA(p), p->size); |
74b2466e | 1090 | |
f55f2dce YW |
1091 | sa = (union sockaddr_union) { |
1092 | .in6.sin6_family = AF_INET6, | |
1093 | .in6.sin6_addr = *destination, | |
1094 | .in6.sin6_port = htobe16(port), | |
1095 | .in6.sin6_scope_id = ifindex, | |
1096 | }; | |
74b2466e LP |
1097 | |
1098 | if (ifindex > 0) { | |
1099 | struct cmsghdr *cmsg; | |
1100 | struct in6_pktinfo *pi; | |
1101 | ||
1716f6dc | 1102 | mh.msg_control = &control; |
a258f491 | 1103 | mh.msg_controllen = sizeof(control); |
74b2466e LP |
1104 | |
1105 | cmsg = CMSG_FIRSTHDR(&mh); | |
a258f491 | 1106 | cmsg->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo)); |
74b2466e LP |
1107 | cmsg->cmsg_level = IPPROTO_IPV6; |
1108 | cmsg->cmsg_type = IPV6_PKTINFO; | |
1109 | ||
1110 | pi = (struct in6_pktinfo*) CMSG_DATA(cmsg); | |
1111 | pi->ipi6_ifindex = ifindex; | |
b30bf55d LP |
1112 | |
1113 | if (source) | |
1114 | pi->ipi6_addr = *source; | |
74b2466e LP |
1115 | } |
1116 | ||
1117 | return sendmsg_loop(fd, &mh, 0); | |
1118 | } | |
1119 | ||
b30bf55d LP |
1120 | int manager_send( |
1121 | Manager *m, | |
1122 | int fd, | |
1123 | int ifindex, | |
1124 | int family, | |
1125 | const union in_addr_union *destination, | |
1126 | uint16_t port, | |
1127 | const union in_addr_union *source, | |
1128 | DnsPacket *p) { | |
1129 | ||
1716f6dc LP |
1130 | assert(m); |
1131 | assert(fd >= 0); | |
b30bf55d | 1132 | assert(destination); |
1716f6dc LP |
1133 | assert(port > 0); |
1134 | assert(p); | |
1135 | ||
76f77229 LP |
1136 | log_debug("Sending %s%s packet with id %" PRIu16 " on interface %i/%s of size %zu.", |
1137 | DNS_PACKET_TC(p) ? "truncated (!) " : "", | |
1138 | DNS_PACKET_QR(p) ? "response" : "query", | |
1139 | DNS_PACKET_ID(p), | |
1140 | ifindex, af_to_name(family), | |
1141 | p->size); | |
a2a416f7 | 1142 | |
1716f6dc | 1143 | if (family == AF_INET) |
25270cf3 | 1144 | return manager_ipv4_send(m, fd, ifindex, &destination->in, port, source ? &source->in : NULL, p); |
2817157b | 1145 | if (family == AF_INET6) |
25270cf3 | 1146 | return manager_ipv6_send(m, fd, ifindex, &destination->in6, port, source ? &source->in6 : NULL, p); |
1716f6dc LP |
1147 | |
1148 | return -EAFNOSUPPORT; | |
1149 | } | |
1150 | ||
e1c95994 LP |
1151 | uint32_t manager_find_mtu(Manager *m) { |
1152 | uint32_t mtu = 0; | |
1153 | Link *l; | |
e1c95994 LP |
1154 | |
1155 | /* If we don't know on which link a DNS packet would be | |
1156 | * delivered, let's find the largest MTU that works on all | |
1157 | * interfaces we know of */ | |
1158 | ||
90e74a66 | 1159 | HASHMAP_FOREACH(l, m->links) { |
e1c95994 LP |
1160 | if (l->mtu <= 0) |
1161 | continue; | |
1162 | ||
1163 | if (mtu <= 0 || l->mtu < mtu) | |
1164 | mtu = l->mtu; | |
1165 | } | |
1166 | ||
1167 | return mtu; | |
1168 | } | |
1716f6dc | 1169 | |
623a4c97 | 1170 | int manager_find_ifindex(Manager *m, int family, const union in_addr_union *in_addr) { |
ec2c5e43 LP |
1171 | LinkAddress *a; |
1172 | ||
1173 | assert(m); | |
1174 | ||
bb3b08ad YW |
1175 | if (!IN_SET(family, AF_INET, AF_INET6)) |
1176 | return 0; | |
1177 | ||
1178 | if (!in_addr) | |
1179 | return 0; | |
1180 | ||
4e945a6f | 1181 | a = manager_find_link_address(m, family, in_addr); |
ec2c5e43 LP |
1182 | if (a) |
1183 | return a->link->ifindex; | |
1184 | ||
1185 | return 0; | |
1186 | } | |
1187 | ||
eb60f9cd | 1188 | void manager_refresh_rrs(Manager *m) { |
eb60f9cd | 1189 | Link *l; |
6db6a464 | 1190 | DnssdService *s; |
eb60f9cd LP |
1191 | |
1192 | assert(m); | |
1193 | ||
78c6a153 LP |
1194 | m->llmnr_host_ipv4_key = dns_resource_key_unref(m->llmnr_host_ipv4_key); |
1195 | m->llmnr_host_ipv6_key = dns_resource_key_unref(m->llmnr_host_ipv6_key); | |
400cb36e DR |
1196 | m->mdns_host_ipv4_key = dns_resource_key_unref(m->mdns_host_ipv4_key); |
1197 | m->mdns_host_ipv6_key = dns_resource_key_unref(m->mdns_host_ipv6_key); | |
eb60f9cd | 1198 | |
6db6a464 | 1199 | if (m->mdns_support == RESOLVE_SUPPORT_YES) |
90e74a66 | 1200 | HASHMAP_FOREACH(s, m->dnssd_services) |
6db6a464 DR |
1201 | if (dnssd_update_rrs(s) < 0) |
1202 | log_warning("Failed to refresh DNS-SD service '%s'", s->name); | |
1203 | ||
90e74a66 | 1204 | HASHMAP_FOREACH(l, m->links) { |
eb60f9cd LP |
1205 | link_add_rrs(l, true); |
1206 | link_add_rrs(l, false); | |
1207 | } | |
1208 | } | |
1209 | ||
e7c1b0e4 | 1210 | static int manager_next_random_name(const char *old, char **ret_new) { |
ec2c5e43 | 1211 | const char *p; |
556a2294 | 1212 | uint64_t u, a; |
e7c1b0e4 | 1213 | char *n; |
623a4c97 | 1214 | |
e7c1b0e4 | 1215 | p = strchr(old, 0); |
ec2c5e43 LP |
1216 | assert(p); |
1217 | ||
e7c1b0e4 DR |
1218 | while (p > old) { |
1219 | if (!strchr(DIGITS, p[-1])) | |
ec2c5e43 LP |
1220 | break; |
1221 | ||
1222 | p--; | |
1223 | } | |
1224 | ||
1225 | if (*p == 0 || safe_atou64(p, &u) < 0 || u <= 0) | |
1226 | u = 1; | |
1227 | ||
556a2294 LP |
1228 | /* Add a random number to the old value. This way we can avoid |
1229 | * that two hosts pick the same hostname, win on IPv4 and lose | |
1230 | * on IPv6 (or vice versa), and pick the same hostname | |
1231 | * replacement hostname, ad infinitum. We still want the | |
1232 | * numbers to go up monotonically, hence we just add a random | |
1233 | * value 1..10 */ | |
1234 | ||
1235 | random_bytes(&a, sizeof(a)); | |
1236 | u += 1 + a % 10; | |
ec2c5e43 | 1237 | |
e7c1b0e4 | 1238 | if (asprintf(&n, "%.*s%" PRIu64, (int) (p - old), old, u) < 0) |
ec2c5e43 LP |
1239 | return -ENOMEM; |
1240 | ||
e7c1b0e4 DR |
1241 | *ret_new = n; |
1242 | ||
1243 | return 0; | |
1244 | } | |
1245 | ||
1246 | int manager_next_hostname(Manager *m) { | |
1247 | _cleanup_free_ char *h = NULL, *k = NULL; | |
1248 | int r; | |
1249 | ||
1250 | assert(m); | |
1251 | ||
1252 | r = manager_next_random_name(m->llmnr_hostname, &h); | |
1253 | if (r < 0) | |
1254 | return r; | |
1255 | ||
7470cc4c | 1256 | r = dns_name_concat(h, "local", 0, &k); |
e7c1b0e4 | 1257 | if (r < 0) |
78c6a153 | 1258 | return r; |
78c6a153 LP |
1259 | |
1260 | log_info("Hostname conflict, changing published hostname from '%s' to '%s'.", m->llmnr_hostname, h); | |
1261 | ||
e7c1b0e4 DR |
1262 | free_and_replace(m->llmnr_hostname, h); |
1263 | free_and_replace(m->mdns_hostname, k); | |
ec2c5e43 | 1264 | |
eb60f9cd | 1265 | manager_refresh_rrs(m); |
86c0411e | 1266 | (void) manager_send_changed(m, "LLMNRHostname"); |
623a4c97 LP |
1267 | |
1268 | return 0; | |
1269 | } | |
ec2c5e43 | 1270 | |
4e945a6f | 1271 | LinkAddress* manager_find_link_address(Manager *m, int family, const union in_addr_union *in_addr) { |
ec2c5e43 LP |
1272 | Link *l; |
1273 | ||
1274 | assert(m); | |
1275 | ||
bb3b08ad YW |
1276 | if (!IN_SET(family, AF_INET, AF_INET6)) |
1277 | return NULL; | |
1278 | ||
1279 | if (!in_addr) | |
1280 | return NULL; | |
1281 | ||
90e74a66 | 1282 | HASHMAP_FOREACH(l, m->links) { |
ec2c5e43 LP |
1283 | LinkAddress *a; |
1284 | ||
1285 | a = link_find_address(l, family, in_addr); | |
1286 | if (a) | |
1287 | return a; | |
1288 | } | |
1289 | ||
1290 | return NULL; | |
1291 | } | |
1292 | ||
94378145 | 1293 | bool manager_packet_from_local_address(Manager *m, DnsPacket *p) { |
ec2c5e43 LP |
1294 | assert(m); |
1295 | assert(p); | |
1296 | ||
94378145 LP |
1297 | /* Let's see if this packet comes from an IP address we have on any local interface */ |
1298 | ||
4e945a6f | 1299 | return !!manager_find_link_address(m, p->family, &p->sender); |
ec2c5e43 | 1300 | } |
4e945a6f | 1301 | |
a9fd8837 LP |
1302 | bool manager_packet_from_our_transaction(Manager *m, DnsPacket *p) { |
1303 | DnsTransaction *t; | |
1304 | ||
1305 | assert(m); | |
1306 | assert(p); | |
1307 | ||
1308 | /* Let's see if we have a transaction with a query message with the exact same binary contents as the | |
1309 | * one we just got. If so, it's almost definitely a packet loop of some kind. */ | |
1310 | ||
1311 | t = hashmap_get(m->dns_transactions, UINT_TO_PTR(DNS_PACKET_ID(p))); | |
1312 | if (!t) | |
1313 | return false; | |
1314 | ||
1315 | return t->sent && dns_packet_equal(t->sent, p); | |
1316 | } | |
1317 | ||
a4076574 LP |
1318 | DnsScope* manager_find_scope(Manager *m, DnsPacket *p) { |
1319 | Link *l; | |
1320 | ||
1321 | assert(m); | |
1322 | assert(p); | |
1323 | ||
1324 | l = hashmap_get(m->links, INT_TO_PTR(p->ifindex)); | |
1325 | if (!l) | |
1326 | return NULL; | |
1327 | ||
b4f1862d DM |
1328 | switch (p->protocol) { |
1329 | case DNS_PROTOCOL_LLMNR: | |
a4076574 LP |
1330 | if (p->family == AF_INET) |
1331 | return l->llmnr_ipv4_scope; | |
1332 | else if (p->family == AF_INET6) | |
1333 | return l->llmnr_ipv6_scope; | |
b4f1862d DM |
1334 | |
1335 | break; | |
1336 | ||
1337 | case DNS_PROTOCOL_MDNS: | |
1338 | if (p->family == AF_INET) | |
1339 | return l->mdns_ipv4_scope; | |
1340 | else if (p->family == AF_INET6) | |
1341 | return l->mdns_ipv6_scope; | |
1342 | ||
1343 | break; | |
1344 | ||
1345 | default: | |
1346 | break; | |
a4076574 LP |
1347 | } |
1348 | ||
1349 | return NULL; | |
1350 | } | |
1351 | ||
902bb5d8 LP |
1352 | void manager_verify_all(Manager *m) { |
1353 | DnsScope *s; | |
1354 | ||
1355 | assert(m); | |
1356 | ||
1357 | LIST_FOREACH(scopes, s, m->dns_scopes) | |
1358 | dns_zone_verify_all(&s->zone); | |
1359 | } | |
1360 | ||
78c6a153 | 1361 | int manager_is_own_hostname(Manager *m, const char *name) { |
78c6a153 LP |
1362 | int r; |
1363 | ||
1364 | assert(m); | |
1365 | assert(name); | |
1366 | ||
1367 | if (m->llmnr_hostname) { | |
1368 | r = dns_name_equal(name, m->llmnr_hostname); | |
1369 | if (r != 0) | |
1370 | return r; | |
1371 | } | |
1372 | ||
e96de0ce LP |
1373 | if (m->mdns_hostname) { |
1374 | r = dns_name_equal(name, m->mdns_hostname); | |
1375 | if (r != 0) | |
1376 | return r; | |
1377 | } | |
1378 | ||
1379 | if (m->full_hostname) | |
1380 | return dns_name_equal(name, m->full_hostname); | |
78c6a153 LP |
1381 | |
1382 | return 0; | |
1383 | } | |
1384 | ||
9176a57c LP |
1385 | int manager_compile_dns_servers(Manager *m, OrderedSet **dns) { |
1386 | DnsServer *s; | |
9176a57c LP |
1387 | Link *l; |
1388 | int r; | |
1389 | ||
1390 | assert(m); | |
1391 | assert(dns); | |
1392 | ||
1393 | r = ordered_set_ensure_allocated(dns, &dns_server_hash_ops); | |
1394 | if (r < 0) | |
1395 | return r; | |
1396 | ||
1397 | /* First add the system-wide servers and domains */ | |
1398 | LIST_FOREACH(servers, s, m->dns_servers) { | |
1399 | r = ordered_set_put(*dns, s); | |
1400 | if (r == -EEXIST) | |
1401 | continue; | |
1402 | if (r < 0) | |
1403 | return r; | |
1404 | } | |
1405 | ||
1406 | /* Then, add the per-link servers */ | |
90e74a66 | 1407 | HASHMAP_FOREACH(l, m->links) { |
9176a57c LP |
1408 | LIST_FOREACH(servers, s, l->dns_servers) { |
1409 | r = ordered_set_put(*dns, s); | |
1410 | if (r == -EEXIST) | |
1411 | continue; | |
1412 | if (r < 0) | |
1413 | return r; | |
1414 | } | |
1415 | } | |
1416 | ||
1417 | /* If we found nothing, add the fallback servers */ | |
1418 | if (ordered_set_isempty(*dns)) { | |
1419 | LIST_FOREACH(servers, s, m->fallback_dns_servers) { | |
1420 | r = ordered_set_put(*dns, s); | |
1421 | if (r == -EEXIST) | |
1422 | continue; | |
1423 | if (r < 0) | |
1424 | return r; | |
1425 | } | |
1426 | } | |
1427 | ||
1428 | return 0; | |
1429 | } | |
1430 | ||
94363cbb MP |
1431 | /* filter_route is a tri-state: |
1432 | * < 0: no filtering | |
1433 | * = 0 or false: return only domains which should be used for searching | |
1434 | * > 0 or true: return only domains which are for routing only | |
1435 | */ | |
6f7da49d | 1436 | int manager_compile_search_domains(Manager *m, OrderedSet **domains, int filter_route) { |
9176a57c | 1437 | DnsSearchDomain *d; |
9176a57c LP |
1438 | Link *l; |
1439 | int r; | |
1440 | ||
1441 | assert(m); | |
1442 | assert(domains); | |
1443 | ||
1444 | r = ordered_set_ensure_allocated(domains, &dns_name_hash_ops); | |
1445 | if (r < 0) | |
1446 | return r; | |
1447 | ||
1448 | LIST_FOREACH(domains, d, m->search_domains) { | |
6f7da49d LP |
1449 | |
1450 | if (filter_route >= 0 && | |
1451 | d->route_only != !!filter_route) | |
1452 | continue; | |
1453 | ||
9176a57c LP |
1454 | r = ordered_set_put(*domains, d->name); |
1455 | if (r == -EEXIST) | |
1456 | continue; | |
1457 | if (r < 0) | |
1458 | return r; | |
1459 | } | |
1460 | ||
90e74a66 | 1461 | HASHMAP_FOREACH(l, m->links) { |
9176a57c LP |
1462 | |
1463 | LIST_FOREACH(domains, d, l->search_domains) { | |
6f7da49d LP |
1464 | |
1465 | if (filter_route >= 0 && | |
1466 | d->route_only != !!filter_route) | |
1467 | continue; | |
1468 | ||
9176a57c LP |
1469 | r = ordered_set_put(*domains, d->name); |
1470 | if (r == -EEXIST) | |
1471 | continue; | |
1472 | if (r < 0) | |
1473 | return r; | |
1474 | } | |
1475 | } | |
1476 | ||
1477 | return 0; | |
1478 | } | |
c69fa7e3 LP |
1479 | |
1480 | DnssecMode manager_get_dnssec_mode(Manager *m) { | |
1481 | assert(m); | |
1482 | ||
1483 | if (m->dnssec_mode != _DNSSEC_MODE_INVALID) | |
1484 | return m->dnssec_mode; | |
1485 | ||
1486 | return DNSSEC_NO; | |
1487 | } | |
1488 | ||
1489 | bool manager_dnssec_supported(Manager *m) { | |
1490 | DnsServer *server; | |
c69fa7e3 LP |
1491 | Link *l; |
1492 | ||
1493 | assert(m); | |
1494 | ||
1495 | if (manager_get_dnssec_mode(m) == DNSSEC_NO) | |
1496 | return false; | |
1497 | ||
1498 | server = manager_get_dns_server(m); | |
1499 | if (server && !dns_server_dnssec_supported(server)) | |
1500 | return false; | |
1501 | ||
90e74a66 | 1502 | HASHMAP_FOREACH(l, m->links) |
c69fa7e3 LP |
1503 | if (!link_dnssec_supported(l)) |
1504 | return false; | |
1505 | ||
1506 | return true; | |
1507 | } | |
59c5b597 | 1508 | |
c9299be2 | 1509 | DnsOverTlsMode manager_get_dns_over_tls_mode(Manager *m) { |
5d67a7ae IT |
1510 | assert(m); |
1511 | ||
c9299be2 IT |
1512 | if (m->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID) |
1513 | return m->dns_over_tls_mode; | |
5d67a7ae | 1514 | |
c9299be2 | 1515 | return DNS_OVER_TLS_NO; |
5d67a7ae IT |
1516 | } |
1517 | ||
59c5b597 LP |
1518 | void manager_dnssec_verdict(Manager *m, DnssecVerdict verdict, const DnsResourceKey *key) { |
1519 | ||
1520 | assert(verdict >= 0); | |
1521 | assert(verdict < _DNSSEC_VERDICT_MAX); | |
1522 | ||
f1d34068 | 1523 | if (DEBUG_LOGGING) { |
202b76ae | 1524 | char s[DNS_RESOURCE_KEY_STRING_MAX]; |
59c5b597 | 1525 | |
202b76ae ZJS |
1526 | log_debug("Found verdict for lookup %s: %s", |
1527 | dns_resource_key_to_string(key, s, sizeof s), | |
1528 | dnssec_verdict_to_string(verdict)); | |
59c5b597 LP |
1529 | } |
1530 | ||
1531 | m->n_dnssec_verdict[verdict]++; | |
1532 | } | |
011696f7 | 1533 | |
de4a0138 | 1534 | bool manager_routable(Manager *m) { |
011696f7 LP |
1535 | Link *l; |
1536 | ||
1537 | assert(m); | |
1538 | ||
de4a0138 | 1539 | /* Returns true if the host has at least one interface with a routable address (regardless if IPv4 or IPv6) */ |
011696f7 | 1540 | |
90e74a66 | 1541 | HASHMAP_FOREACH(l, m->links) |
de4a0138 | 1542 | if (link_relevant(l, AF_UNSPEC, false)) |
011696f7 LP |
1543 | return true; |
1544 | ||
1545 | return false; | |
1546 | } | |
ba35662f | 1547 | |
90df0fbe | 1548 | void manager_flush_caches(Manager *m, int log_level) { |
ba35662f LP |
1549 | DnsScope *scope; |
1550 | ||
1551 | assert(m); | |
1552 | ||
1553 | LIST_FOREACH(scopes, scope, m->dns_scopes) | |
1554 | dns_cache_flush(&scope->cache); | |
aac57b35 | 1555 | |
90df0fbe | 1556 | log_full(log_level, "Flushed all caches."); |
ba35662f | 1557 | } |
943ef07c | 1558 | |
59c0fd0e | 1559 | void manager_reset_server_features(Manager *m) { |
59c0fd0e LP |
1560 | Link *l; |
1561 | ||
1562 | dns_server_reset_features_all(m->dns_servers); | |
1563 | dns_server_reset_features_all(m->fallback_dns_servers); | |
1564 | ||
90e74a66 | 1565 | HASHMAP_FOREACH(l, m->links) |
59c0fd0e LP |
1566 | dns_server_reset_features_all(l->dns_servers); |
1567 | ||
1568 | log_info("Resetting learnt feature levels on all servers."); | |
1569 | } | |
1570 | ||
943ef07c LP |
1571 | void manager_cleanup_saved_user(Manager *m) { |
1572 | _cleanup_closedir_ DIR *d = NULL; | |
1573 | struct dirent *de; | |
943ef07c LP |
1574 | |
1575 | assert(m); | |
1576 | ||
1577 | /* Clean up all saved per-link files in /run/systemd/resolve/netif/ that don't have a matching interface | |
1578 | * anymore. These files are created to persist settings pushed in by the user via the bus, so that resolved can | |
1579 | * be restarted without losing this data. */ | |
1580 | ||
1581 | d = opendir("/run/systemd/resolve/netif/"); | |
1582 | if (!d) { | |
1583 | if (errno == ENOENT) | |
1584 | return; | |
1585 | ||
1586 | log_warning_errno(errno, "Failed to open interface directory: %m"); | |
1587 | return; | |
1588 | } | |
1589 | ||
1590 | FOREACH_DIRENT_ALL(de, d, log_error_errno(errno, "Failed to read interface directory: %m")) { | |
1591 | _cleanup_free_ char *p = NULL; | |
1592 | int ifindex; | |
1593 | Link *l; | |
1594 | ||
1595 | if (!IN_SET(de->d_type, DT_UNKNOWN, DT_REG)) | |
1596 | continue; | |
1597 | ||
49bfc877 | 1598 | if (dot_or_dot_dot(de->d_name)) |
943ef07c LP |
1599 | continue; |
1600 | ||
597da51b ZJS |
1601 | ifindex = parse_ifindex(de->d_name); |
1602 | if (ifindex < 0) /* Probably some temporary file from a previous run. Delete it */ | |
943ef07c LP |
1603 | goto rm; |
1604 | ||
1605 | l = hashmap_get(m->links, INT_TO_PTR(ifindex)); | |
1606 | if (!l) /* link vanished */ | |
1607 | goto rm; | |
1608 | ||
1609 | if (l->is_managed) /* now managed by networkd, hence the bus settings are useless */ | |
1610 | goto rm; | |
1611 | ||
1612 | continue; | |
1613 | ||
1614 | rm: | |
b910cc72 | 1615 | p = path_join("/run/systemd/resolve/netif", de->d_name); |
943ef07c LP |
1616 | if (!p) { |
1617 | log_oom(); | |
1618 | return; | |
1619 | } | |
1620 | ||
1621 | (void) unlink(p); | |
1622 | } | |
1623 | } | |
e7c1b0e4 DR |
1624 | |
1625 | bool manager_next_dnssd_names(Manager *m) { | |
e7c1b0e4 DR |
1626 | DnssdService *s; |
1627 | bool tried = false; | |
1628 | int r; | |
1629 | ||
1630 | assert(m); | |
1631 | ||
90e74a66 | 1632 | HASHMAP_FOREACH(s, m->dnssd_services) { |
e7c1b0e4 DR |
1633 | _cleanup_free_ char * new_name = NULL; |
1634 | ||
1635 | if (!s->withdrawn) | |
1636 | continue; | |
1637 | ||
1638 | r = manager_next_random_name(s->name_template, &new_name); | |
1639 | if (r < 0) { | |
1640 | log_warning_errno(r, "Failed to get new name for service '%s': %m", s->name); | |
1641 | continue; | |
1642 | } | |
1643 | ||
1644 | free_and_replace(s->name_template, new_name); | |
1645 | ||
1646 | s->withdrawn = false; | |
1647 | ||
1648 | tried = true; | |
1649 | } | |
1650 | ||
1651 | if (tried) | |
1652 | manager_refresh_rrs(m); | |
1653 | ||
1654 | return tried; | |
1655 | } | |
49ef064c LP |
1656 | |
1657 | bool manager_server_is_stub(Manager *m, DnsServer *s) { | |
1658 | DnsStubListenerExtra *l; | |
1659 | ||
1660 | assert(m); | |
1661 | assert(s); | |
1662 | ||
1663 | /* Safety check: we generally already skip the main stub when parsing configuration. But let's be | |
1664 | * extra careful, and check here again */ | |
1665 | if (s->family == AF_INET && | |
1666 | s->address.in.s_addr == htobe32(INADDR_DNS_STUB) && | |
1667 | dns_server_port(s) == 53) | |
1668 | return true; | |
1669 | ||
1670 | /* Main reason to call this is to check server data against the extra listeners, and filter things | |
1671 | * out. */ | |
1672 | ORDERED_SET_FOREACH(l, m->dns_extra_stub_listeners) | |
1673 | if (s->family == l->family && | |
1674 | in_addr_equal(s->family, &s->address, &l->address) && | |
1675 | dns_server_port(s) == dns_stub_listener_extra_port(l)) | |
1676 | return true; | |
1677 | ||
1678 | return false; | |
1679 | } | |
eb170e75 LP |
1680 | |
1681 | int socket_disable_pmtud(int fd, int af) { | |
1682 | int r; | |
1683 | ||
1684 | assert(fd >= 0); | |
1685 | ||
1686 | if (af == AF_UNSPEC) { | |
1687 | r = socket_get_family(fd, &af); | |
1688 | if (r < 0) | |
1689 | return r; | |
1690 | } | |
1691 | ||
1692 | switch (af) { | |
1693 | ||
1694 | case AF_INET: { | |
1695 | /* Turn off path MTU discovery, let's rather fragment on the way than to open us up against | |
1696 | * PMTU forgery vulnerabilities. | |
1697 | * | |
1698 | * There appears to be no documentation about IP_PMTUDISC_OMIT, but it has the effect that | |
1699 | * the "Don't Fragment" bit in the IPv4 header is turned off, thus enforcing fragmentation if | |
1700 | * our datagram size exceeds the MTU of a router in the path, and turning off path MTU | |
1701 | * discovery. | |
1702 | * | |
1703 | * This helps mitigating the PMTUD vulnerability described here: | |
1704 | * | |
1705 | * https://blog.apnic.net/2019/07/12/its-time-to-consider-avoiding-ip-fragmentation-in-the-dns/ | |
1706 | * | |
1707 | * Similar logic is in place in most DNS servers. | |
1708 | * | |
1709 | * There are multiple conflicting goals: we want to allow the largest datagrams possible (for | |
1710 | * efficiency reasons), but not have fragmentation (for security reasons), nor use PMTUD (for | |
1711 | * security reasons, too). Our strategy to deal with this is: use large packets, turn off | |
1712 | * PMTUD, but watch fragmentation taking place, and then size our packets to the max of the | |
1713 | * fragments seen — and if we need larger packets always go to TCP. | |
1714 | */ | |
1715 | ||
1716 | r = setsockopt_int(fd, IPPROTO_IP, IP_MTU_DISCOVER, IP_PMTUDISC_OMIT); | |
1717 | if (r < 0) | |
1718 | return r; | |
1719 | ||
1720 | return 0; | |
1721 | } | |
1722 | ||
1723 | case AF_INET6: { | |
1724 | /* On IPv6 fragmentation only is done by the sender — never by routers on the path. PMTUD is | |
1725 | * mandatory. If we want to turn off PMTUD, the only way is by sending with minimal MTU only, | |
1726 | * so that we apply maximum fragmentation locally already, and thus PMTUD doesn't happen | |
1727 | * because there's nothing that could be fragmented further anymore. */ | |
1728 | ||
1729 | r = setsockopt_int(fd, IPPROTO_IPV6, IPV6_MTU, IPV6_MIN_MTU); | |
1730 | if (r < 0) | |
1731 | return r; | |
1732 | ||
1733 | return 0; | |
1734 | } | |
1735 | ||
1736 | default: | |
1737 | return -EAFNOSUPPORT; | |
1738 | } | |
1739 | } |