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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
091a364c | 2 | |
07630cea LP |
3 | #include <netinet/in.h> |
4 | #include <poll.h> | |
0d536673 | 5 | #include <stdio_ext.h> |
74b2466e | 6 | #include <sys/ioctl.h> |
091a364c | 7 | |
349cc4a5 | 8 | #if HAVE_LIBIDN2 |
87057e24 ZJS |
9 | #include <idn2.h> |
10 | #endif | |
11 | ||
a2a416f7 | 12 | #include "af-list.h" |
b5efdb8a | 13 | #include "alloc-util.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" |
c004493c | 19 | #include "io-util.h" |
07630cea LP |
20 | #include "netlink-util.h" |
21 | #include "network-internal.h" | |
822db23c | 22 | #include "ordered-set.h" |
6bedfcbb | 23 | #include "parse-util.h" |
3df3e884 | 24 | #include "random-util.h" |
39d8db04 | 25 | #include "resolved-bus.h" |
07630cea | 26 | #include "resolved-conf.h" |
b30bf55d | 27 | #include "resolved-dns-stub.h" |
cb310866 | 28 | #include "resolved-dnssd.h" |
dd0bc0f1 | 29 | #include "resolved-etc-hosts.h" |
5f402ae8 | 30 | #include "resolved-llmnr.h" |
07630cea | 31 | #include "resolved-manager.h" |
bc7702b0 | 32 | #include "resolved-mdns.h" |
dd0bc0f1 | 33 | #include "resolved-resolv-conf.h" |
07630cea | 34 | #include "socket-util.h" |
8b43440b | 35 | #include "string-table.h" |
07630cea LP |
36 | #include "string-util.h" |
37 | #include "utf8.h" | |
74b2466e LP |
38 | |
39 | #define SEND_TIMEOUT_USEC (200 * USEC_PER_MSEC) | |
40 | ||
1c4baffc | 41 | static int manager_process_link(sd_netlink *rtnl, sd_netlink_message *mm, void *userdata) { |
74b2466e LP |
42 | Manager *m = userdata; |
43 | uint16_t type; | |
44 | Link *l; | |
45 | int ifindex, r; | |
46 | ||
47 | assert(rtnl); | |
48 | assert(m); | |
49 | assert(mm); | |
50 | ||
1c4baffc | 51 | r = sd_netlink_message_get_type(mm, &type); |
74b2466e LP |
52 | if (r < 0) |
53 | goto fail; | |
54 | ||
55 | r = sd_rtnl_message_link_get_ifindex(mm, &ifindex); | |
56 | if (r < 0) | |
57 | goto fail; | |
58 | ||
59 | l = hashmap_get(m->links, INT_TO_PTR(ifindex)); | |
60 | ||
61 | switch (type) { | |
62 | ||
a2a416f7 LP |
63 | case RTM_NEWLINK:{ |
64 | bool is_new = !l; | |
74b2466e | 65 | |
a2a416f7 | 66 | if (!l) { |
74b2466e LP |
67 | r = link_new(m, &l, ifindex); |
68 | if (r < 0) | |
69 | goto fail; | |
70 | } | |
71 | ||
943ef07c | 72 | r = link_process_rtnl(l, mm); |
74b2466e LP |
73 | if (r < 0) |
74 | goto fail; | |
75 | ||
943ef07c | 76 | r = link_update(l); |
21d73c87 LP |
77 | if (r < 0) |
78 | goto fail; | |
79 | ||
a2a416f7 LP |
80 | if (is_new) |
81 | log_debug("Found new link %i/%s", ifindex, l->name); | |
82 | ||
74b2466e | 83 | break; |
a2a416f7 | 84 | } |
74b2466e LP |
85 | |
86 | case RTM_DELLINK: | |
87 | if (l) { | |
a2a416f7 | 88 | log_debug("Removing link %i/%s", l->ifindex, l->name); |
943ef07c | 89 | link_remove_user(l); |
74b2466e LP |
90 | link_free(l); |
91 | } | |
92 | ||
93 | break; | |
94 | } | |
95 | ||
96 | return 0; | |
97 | ||
98 | fail: | |
da927ba9 | 99 | log_warning_errno(r, "Failed to process RTNL link message: %m"); |
74b2466e LP |
100 | return 0; |
101 | } | |
102 | ||
1c4baffc | 103 | static int manager_process_address(sd_netlink *rtnl, sd_netlink_message *mm, void *userdata) { |
74b2466e LP |
104 | Manager *m = userdata; |
105 | union in_addr_union address; | |
74b2466e | 106 | uint16_t type; |
0dd25fb9 | 107 | int r, ifindex, family; |
74b2466e LP |
108 | LinkAddress *a; |
109 | Link *l; | |
110 | ||
111 | assert(rtnl); | |
112 | assert(mm); | |
113 | assert(m); | |
114 | ||
1c4baffc | 115 | r = sd_netlink_message_get_type(mm, &type); |
74b2466e LP |
116 | if (r < 0) |
117 | goto fail; | |
118 | ||
119 | r = sd_rtnl_message_addr_get_ifindex(mm, &ifindex); | |
120 | if (r < 0) | |
121 | goto fail; | |
122 | ||
123 | l = hashmap_get(m->links, INT_TO_PTR(ifindex)); | |
124 | if (!l) | |
125 | return 0; | |
126 | ||
127 | r = sd_rtnl_message_addr_get_family(mm, &family); | |
128 | if (r < 0) | |
129 | goto fail; | |
130 | ||
131 | switch (family) { | |
132 | ||
133 | case AF_INET: | |
1c4baffc | 134 | r = sd_netlink_message_read_in_addr(mm, IFA_LOCAL, &address.in); |
74b2466e | 135 | if (r < 0) { |
1c4baffc | 136 | r = sd_netlink_message_read_in_addr(mm, IFA_ADDRESS, &address.in); |
74b2466e LP |
137 | if (r < 0) |
138 | goto fail; | |
139 | } | |
140 | ||
141 | break; | |
142 | ||
143 | case AF_INET6: | |
1c4baffc | 144 | r = sd_netlink_message_read_in6_addr(mm, IFA_LOCAL, &address.in6); |
74b2466e | 145 | if (r < 0) { |
1c4baffc | 146 | r = sd_netlink_message_read_in6_addr(mm, IFA_ADDRESS, &address.in6); |
74b2466e LP |
147 | if (r < 0) |
148 | goto fail; | |
149 | } | |
150 | ||
151 | break; | |
152 | ||
153 | default: | |
154 | return 0; | |
155 | } | |
156 | ||
157 | a = link_find_address(l, family, &address); | |
158 | ||
159 | switch (type) { | |
160 | ||
161 | case RTM_NEWADDR: | |
162 | ||
163 | if (!a) { | |
164 | r = link_address_new(l, &a, family, &address); | |
165 | if (r < 0) | |
166 | return r; | |
167 | } | |
168 | ||
169 | r = link_address_update_rtnl(a, mm); | |
170 | if (r < 0) | |
171 | return r; | |
172 | ||
173 | break; | |
174 | ||
175 | case RTM_DELADDR: | |
3e044c49 | 176 | link_address_free(a); |
74b2466e LP |
177 | break; |
178 | } | |
179 | ||
180 | return 0; | |
181 | ||
182 | fail: | |
da927ba9 | 183 | log_warning_errno(r, "Failed to process RTNL address message: %m"); |
74b2466e LP |
184 | return 0; |
185 | } | |
186 | ||
74b2466e | 187 | static int manager_rtnl_listen(Manager *m) { |
4afd3348 | 188 | _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL; |
1c4baffc | 189 | sd_netlink_message *i; |
74b2466e LP |
190 | int r; |
191 | ||
192 | assert(m); | |
193 | ||
cc98b302 | 194 | /* First, subscribe to interfaces coming and going */ |
1c4baffc | 195 | r = sd_netlink_open(&m->rtnl); |
74b2466e LP |
196 | if (r < 0) |
197 | return r; | |
198 | ||
2d895038 | 199 | r = sd_netlink_attach_event(m->rtnl, m->event, SD_EVENT_PRIORITY_IMPORTANT); |
74b2466e LP |
200 | if (r < 0) |
201 | return r; | |
202 | ||
8190a388 | 203 | r = sd_netlink_add_match(m->rtnl, NULL, RTM_NEWLINK, manager_process_link, NULL, m, "resolve-NEWLINK"); |
74b2466e LP |
204 | if (r < 0) |
205 | return r; | |
206 | ||
8190a388 | 207 | r = sd_netlink_add_match(m->rtnl, NULL, RTM_DELLINK, manager_process_link, NULL, m, "resolve-DELLINK"); |
74b2466e LP |
208 | if (r < 0) |
209 | return r; | |
210 | ||
8190a388 | 211 | r = sd_netlink_add_match(m->rtnl, NULL, RTM_NEWADDR, manager_process_address, NULL, m, "resolve-NEWADDR"); |
74b2466e LP |
212 | if (r < 0) |
213 | return r; | |
091a364c | 214 | |
8190a388 | 215 | r = sd_netlink_add_match(m->rtnl, NULL, RTM_DELADDR, manager_process_address, NULL, m, "resolve-DELADDR"); |
74b2466e LP |
216 | if (r < 0) |
217 | return r; | |
218 | ||
219 | /* Then, enumerate all links */ | |
220 | r = sd_rtnl_message_new_link(m->rtnl, &req, RTM_GETLINK, 0); | |
221 | if (r < 0) | |
222 | return r; | |
223 | ||
1c4baffc | 224 | r = sd_netlink_message_request_dump(req, true); |
74b2466e LP |
225 | if (r < 0) |
226 | return r; | |
227 | ||
1c4baffc | 228 | r = sd_netlink_call(m->rtnl, req, 0, &reply); |
74b2466e LP |
229 | if (r < 0) |
230 | return r; | |
231 | ||
1c4baffc | 232 | for (i = reply; i; i = sd_netlink_message_next(i)) { |
74b2466e LP |
233 | r = manager_process_link(m->rtnl, i, m); |
234 | if (r < 0) | |
235 | return r; | |
236 | } | |
237 | ||
1c4baffc TG |
238 | req = sd_netlink_message_unref(req); |
239 | reply = sd_netlink_message_unref(reply); | |
74b2466e LP |
240 | |
241 | /* Finally, enumerate all addresses, too */ | |
242 | r = sd_rtnl_message_new_addr(m->rtnl, &req, RTM_GETADDR, 0, AF_UNSPEC); | |
243 | if (r < 0) | |
244 | return r; | |
245 | ||
1c4baffc | 246 | r = sd_netlink_message_request_dump(req, true); |
74b2466e LP |
247 | if (r < 0) |
248 | return r; | |
249 | ||
1c4baffc | 250 | r = sd_netlink_call(m->rtnl, req, 0, &reply); |
74b2466e LP |
251 | if (r < 0) |
252 | return r; | |
253 | ||
1c4baffc | 254 | for (i = reply; i; i = sd_netlink_message_next(i)) { |
74b2466e LP |
255 | r = manager_process_address(m->rtnl, i, m); |
256 | if (r < 0) | |
257 | return r; | |
258 | } | |
259 | ||
260 | return r; | |
261 | } | |
262 | ||
263 | static int on_network_event(sd_event_source *s, int fd, uint32_t revents, void *userdata) { | |
264 | Manager *m = userdata; | |
265 | Iterator i; | |
266 | Link *l; | |
267 | int r; | |
268 | ||
269 | assert(m); | |
270 | ||
271 | sd_network_monitor_flush(m->network_monitor); | |
272 | ||
273 | HASHMAP_FOREACH(l, m->links, i) { | |
943ef07c | 274 | r = link_update(l); |
74b2466e | 275 | if (r < 0) |
da927ba9 | 276 | log_warning_errno(r, "Failed to update monitor information for %i: %m", l->ifindex); |
74b2466e LP |
277 | } |
278 | ||
7207052d | 279 | (void) manager_write_resolv_conf(m); |
74b2466e LP |
280 | |
281 | return 0; | |
282 | } | |
283 | ||
284 | static int manager_network_monitor_listen(Manager *m) { | |
285 | int r, fd, events; | |
286 | ||
287 | assert(m); | |
288 | ||
0014a4ad | 289 | r = sd_network_monitor_new(&m->network_monitor, NULL); |
74b2466e LP |
290 | if (r < 0) |
291 | return r; | |
292 | ||
293 | fd = sd_network_monitor_get_fd(m->network_monitor); | |
294 | if (fd < 0) | |
295 | return fd; | |
296 | ||
297 | events = sd_network_monitor_get_events(m->network_monitor); | |
298 | if (events < 0) | |
299 | return events; | |
300 | ||
301 | r = sd_event_add_io(m->event, &m->network_event_source, fd, events, &on_network_event, m); | |
302 | if (r < 0) | |
2d895038 LP |
303 | return r; |
304 | ||
305 | r = sd_event_source_set_priority(m->network_event_source, SD_EVENT_PRIORITY_IMPORTANT+5); | |
306 | if (r < 0) | |
74b2466e LP |
307 | return r; |
308 | ||
aa4a9deb LP |
309 | (void) sd_event_source_set_description(m->network_event_source, "network-monitor"); |
310 | ||
74b2466e LP |
311 | return 0; |
312 | } | |
313 | ||
e96de0ce | 314 | static int determine_hostname(char **full_hostname, char **llmnr_hostname, char **mdns_hostname) { |
eb60f9cd | 315 | _cleanup_free_ char *h = NULL, *n = NULL; |
349cc4a5 | 316 | #if HAVE_LIBIDN2 |
87057e24 | 317 | _cleanup_free_ char *utf8 = NULL; |
349cc4a5 | 318 | #elif HAVE_LIBIDN |
87057e24 ZJS |
319 | int k; |
320 | #endif | |
78c6a153 | 321 | char label[DNS_LABEL_MAX]; |
87057e24 ZJS |
322 | const char *p, *decoded; |
323 | int r; | |
eb60f9cd | 324 | |
e96de0ce | 325 | assert(full_hostname); |
78c6a153 LP |
326 | assert(llmnr_hostname); |
327 | assert(mdns_hostname); | |
328 | ||
a25b0dc8 | 329 | /* Extract and normalize the first label of the locally configured hostname, and check it's not "localhost". */ |
eb60f9cd | 330 | |
a25b0dc8 LP |
331 | r = gethostname_strict(&h); |
332 | if (r < 0) | |
333 | return log_debug_errno(r, "Can't determine system hostname: %m"); | |
eb60f9cd | 334 | |
78c6a153 | 335 | p = h; |
87057e24 | 336 | r = dns_label_unescape(&p, label, sizeof label); |
78c6a153 LP |
337 | if (r < 0) |
338 | return log_error_errno(r, "Failed to unescape host name: %m"); | |
baaa35ad ZJS |
339 | if (r == 0) |
340 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
341 | "Couldn't find a single label in hostname."); | |
78c6a153 | 342 | |
349cc4a5 | 343 | #if HAVE_LIBIDN2 |
87057e24 ZJS |
344 | r = idn2_to_unicode_8z8z(label, &utf8, 0); |
345 | if (r != IDN2_OK) | |
346 | return log_error("Failed to undo IDNA: %s", idn2_strerror(r)); | |
347 | assert(utf8_is_valid(utf8)); | |
348 | ||
349 | r = strlen(utf8); | |
350 | decoded = utf8; | |
349cc4a5 | 351 | #elif HAVE_LIBIDN |
87057e24 | 352 | k = dns_label_undo_idna(label, r, label, sizeof label); |
78c6a153 LP |
353 | if (k < 0) |
354 | return log_error_errno(k, "Failed to undo IDNA: %m"); | |
355 | if (k > 0) | |
356 | r = k; | |
357 | ||
baaa35ad ZJS |
358 | if (!utf8_is_valid(label)) |
359 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
360 | "System hostname is not UTF-8 clean."); | |
87057e24 ZJS |
361 | decoded = label; |
362 | #else | |
363 | decoded = label; /* no decoding */ | |
364 | #endif | |
eb60f9cd | 365 | |
87057e24 | 366 | r = dns_label_escape_new(decoded, r, &n); |
78c6a153 LP |
367 | if (r < 0) |
368 | return log_error_errno(r, "Failed to escape host name: %m"); | |
369 | ||
baaa35ad ZJS |
370 | if (is_localhost(n)) |
371 | return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), | |
372 | "System hostname is 'localhost', ignoring."); | |
eb60f9cd | 373 | |
78c6a153 LP |
374 | r = dns_name_concat(n, "local", mdns_hostname); |
375 | if (r < 0) | |
376 | return log_error_errno(r, "Failed to determine mDNS hostname: %m"); | |
377 | ||
ae2a15bc LP |
378 | *llmnr_hostname = TAKE_PTR(n); |
379 | *full_hostname = TAKE_PTR(h); | |
e96de0ce | 380 | |
eb60f9cd LP |
381 | return 0; |
382 | } | |
383 | ||
a25b0dc8 LP |
384 | static const char *fallback_hostname(void) { |
385 | ||
386 | /* Determine the fall back hostname. For exposing this system to the outside world, we cannot have it to be | |
387 | * "localhost" even if that's the compiled in hostname. In this case, let's revert to "linux" instead. */ | |
388 | ||
389 | if (is_localhost(FALLBACK_HOSTNAME)) | |
390 | return "linux"; | |
391 | ||
392 | return FALLBACK_HOSTNAME; | |
393 | } | |
394 | ||
395 | static int make_fallback_hostnames(char **full_hostname, char **llmnr_hostname, char **mdns_hostname) { | |
396 | _cleanup_free_ char *n = NULL, *m = NULL; | |
397 | char label[DNS_LABEL_MAX], *h; | |
398 | const char *p; | |
399 | int r; | |
400 | ||
401 | assert(full_hostname); | |
402 | assert(llmnr_hostname); | |
403 | assert(mdns_hostname); | |
404 | ||
405 | p = fallback_hostname(); | |
406 | r = dns_label_unescape(&p, label, sizeof(label)); | |
407 | if (r < 0) | |
408 | return log_error_errno(r, "Failed to unescape fallback host name: %m"); | |
409 | ||
410 | assert(r > 0); /* The fallback hostname must have at least one label */ | |
411 | ||
412 | r = dns_label_escape_new(label, r, &n); | |
413 | if (r < 0) | |
414 | return log_error_errno(r, "Failed to escape fallback hostname: %m"); | |
415 | ||
416 | r = dns_name_concat(n, "local", &m); | |
417 | if (r < 0) | |
418 | return log_error_errno(r, "Failed to concatenate mDNS hostname: %m"); | |
419 | ||
420 | h = strdup(fallback_hostname()); | |
421 | if (!h) | |
422 | return log_oom(); | |
423 | ||
ae2a15bc LP |
424 | *llmnr_hostname = TAKE_PTR(n); |
425 | *mdns_hostname = TAKE_PTR(m); | |
a25b0dc8 LP |
426 | |
427 | *full_hostname = h; | |
428 | ||
429 | return 0; | |
430 | } | |
431 | ||
eb60f9cd | 432 | static int on_hostname_change(sd_event_source *es, int fd, uint32_t revents, void *userdata) { |
e96de0ce | 433 | _cleanup_free_ char *full_hostname = NULL, *llmnr_hostname = NULL, *mdns_hostname = NULL; |
eb60f9cd LP |
434 | Manager *m = userdata; |
435 | int r; | |
436 | ||
437 | assert(m); | |
438 | ||
e96de0ce | 439 | r = determine_hostname(&full_hostname, &llmnr_hostname, &mdns_hostname); |
eb60f9cd LP |
440 | if (r < 0) |
441 | return 0; /* ignore invalid hostnames */ | |
442 | ||
e96de0ce LP |
443 | if (streq(full_hostname, m->full_hostname) && |
444 | streq(llmnr_hostname, m->llmnr_hostname) && | |
445 | streq(mdns_hostname, m->mdns_hostname)) | |
eb60f9cd LP |
446 | return 0; |
447 | ||
e96de0ce | 448 | log_info("System hostname changed to '%s'.", full_hostname); |
78c6a153 | 449 | |
e96de0ce LP |
450 | free_and_replace(m->full_hostname, full_hostname); |
451 | free_and_replace(m->llmnr_hostname, llmnr_hostname); | |
452 | free_and_replace(m->mdns_hostname, mdns_hostname); | |
eb60f9cd LP |
453 | |
454 | manager_refresh_rrs(m); | |
455 | ||
456 | return 0; | |
457 | } | |
458 | ||
459 | static int manager_watch_hostname(Manager *m) { | |
eb60f9cd LP |
460 | int r; |
461 | ||
462 | assert(m); | |
463 | ||
db4a47e9 LP |
464 | m->hostname_fd = open("/proc/sys/kernel/hostname", |
465 | O_RDONLY|O_CLOEXEC|O_NONBLOCK|O_NOCTTY); | |
eb60f9cd | 466 | if (m->hostname_fd < 0) { |
56f64d95 | 467 | log_warning_errno(errno, "Failed to watch hostname: %m"); |
eb60f9cd LP |
468 | return 0; |
469 | } | |
470 | ||
471 | r = sd_event_add_io(m->event, &m->hostname_event_source, m->hostname_fd, 0, on_hostname_change, m); | |
472 | if (r < 0) { | |
473 | if (r == -EPERM) | |
474 | /* kernels prior to 3.2 don't support polling this file. Ignore the failure. */ | |
475 | m->hostname_fd = safe_close(m->hostname_fd); | |
8d3d7072 MS |
476 | else |
477 | return log_error_errno(r, "Failed to add hostname event source: %m"); | |
eb60f9cd LP |
478 | } |
479 | ||
aa4a9deb LP |
480 | (void) sd_event_source_set_description(m->hostname_event_source, "hostname"); |
481 | ||
e96de0ce | 482 | r = determine_hostname(&m->full_hostname, &m->llmnr_hostname, &m->mdns_hostname); |
eb60f9cd | 483 | if (r < 0) { |
a25b0dc8 | 484 | log_info("Defaulting to hostname '%s'.", fallback_hostname()); |
78c6a153 | 485 | |
a25b0dc8 LP |
486 | r = make_fallback_hostnames(&m->full_hostname, &m->llmnr_hostname, &m->mdns_hostname); |
487 | if (r < 0) | |
488 | return r; | |
eb60f9cd | 489 | } else |
e96de0ce | 490 | log_info("Using system hostname '%s'.", m->full_hostname); |
eb60f9cd LP |
491 | |
492 | return 0; | |
493 | } | |
494 | ||
4d506d6b LP |
495 | static int manager_sigusr1(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { |
496 | _cleanup_free_ char *buffer = NULL; | |
497 | _cleanup_fclose_ FILE *f = NULL; | |
498 | Manager *m = userdata; | |
cf84484a | 499 | DnsServer *server; |
4d506d6b LP |
500 | size_t size = 0; |
501 | DnsScope *scope; | |
cf84484a LP |
502 | Iterator i; |
503 | Link *l; | |
4d506d6b LP |
504 | |
505 | assert(s); | |
506 | assert(si); | |
507 | assert(m); | |
508 | ||
509 | f = open_memstream(&buffer, &size); | |
510 | if (!f) | |
511 | return log_oom(); | |
512 | ||
0d536673 LP |
513 | (void) __fsetlocking(f, FSETLOCKING_BYCALLER); |
514 | ||
4d506d6b LP |
515 | LIST_FOREACH(scopes, scope, m->dns_scopes) |
516 | dns_scope_dump(scope, f); | |
517 | ||
cf84484a LP |
518 | LIST_FOREACH(servers, server, m->dns_servers) |
519 | dns_server_dump(server, f); | |
520 | LIST_FOREACH(servers, server, m->fallback_dns_servers) | |
521 | dns_server_dump(server, f); | |
522 | HASHMAP_FOREACH(l, m->links, i) | |
523 | LIST_FOREACH(servers, server, l->dns_servers) | |
524 | dns_server_dump(server, f); | |
525 | ||
4d506d6b LP |
526 | if (fflush_and_check(f) < 0) |
527 | return log_oom(); | |
528 | ||
529 | log_dump(LOG_INFO, buffer); | |
530 | return 0; | |
531 | } | |
532 | ||
bc81447e LP |
533 | static int manager_sigusr2(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { |
534 | Manager *m = userdata; | |
bc81447e LP |
535 | |
536 | assert(s); | |
537 | assert(si); | |
538 | assert(m); | |
539 | ||
ba35662f | 540 | manager_flush_caches(m); |
ba35662f | 541 | |
bc81447e LP |
542 | return 0; |
543 | } | |
544 | ||
d55b0463 LP |
545 | static int manager_sigrtmin1(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { |
546 | Manager *m = userdata; | |
547 | ||
548 | assert(s); | |
549 | assert(si); | |
550 | assert(m); | |
551 | ||
552 | manager_reset_server_features(m); | |
553 | return 0; | |
554 | } | |
555 | ||
091a364c | 556 | int manager_new(Manager **ret) { |
74b2466e | 557 | _cleanup_(manager_freep) Manager *m = NULL; |
091a364c TG |
558 | int r; |
559 | ||
c92e531c LP |
560 | assert(ret); |
561 | ||
f55f2dce | 562 | m = new(Manager, 1); |
091a364c TG |
563 | if (!m) |
564 | return -ENOMEM; | |
565 | ||
f55f2dce YW |
566 | *m = (Manager) { |
567 | .llmnr_ipv4_udp_fd = -1, | |
568 | .llmnr_ipv6_udp_fd = -1, | |
569 | .llmnr_ipv4_tcp_fd = -1, | |
570 | .llmnr_ipv6_tcp_fd = -1, | |
571 | .mdns_ipv4_fd = -1, | |
572 | .mdns_ipv6_fd = -1, | |
573 | .dns_stub_udp_fd = -1, | |
574 | .dns_stub_tcp_fd = -1, | |
575 | .hostname_fd = -1, | |
576 | ||
577 | .llmnr_support = RESOLVE_SUPPORT_YES, | |
578 | .mdns_support = RESOLVE_SUPPORT_YES, | |
579 | .dnssec_mode = DEFAULT_DNSSEC_MODE, | |
580 | .dns_over_tls_mode = DEFAULT_DNS_OVER_TLS_MODE, | |
581 | .enable_cache = true, | |
582 | .dns_stub_listener_mode = DNS_STUB_LISTENER_UDP, | |
583 | .read_resolv_conf = true, | |
584 | .need_builtin_fallbacks = true, | |
585 | .etc_hosts_last = USEC_INFINITY, | |
586 | .etc_hosts_mtime = USEC_INFINITY, | |
587 | .read_etc_hosts = true, | |
588 | }; | |
091a364c | 589 | |
0d2cd476 LP |
590 | r = dns_trust_anchor_load(&m->trust_anchor); |
591 | if (r < 0) | |
592 | return r; | |
593 | ||
ad6c0475 LP |
594 | r = manager_parse_config_file(m); |
595 | if (r < 0) | |
5ce497b5 | 596 | log_warning_errno(r, "Failed to parse configuration file: %m"); |
ad6c0475 | 597 | |
091a364c TG |
598 | r = sd_event_default(&m->event); |
599 | if (r < 0) | |
600 | return r; | |
601 | ||
1ae17292 YW |
602 | (void) sd_event_add_signal(m->event, NULL, SIGTERM, NULL, NULL); |
603 | (void) sd_event_add_signal(m->event, NULL, SIGINT, NULL, NULL); | |
091a364c | 604 | |
1ae17292 | 605 | (void) sd_event_set_watchdog(m->event, true); |
091a364c | 606 | |
eb60f9cd LP |
607 | r = manager_watch_hostname(m); |
608 | if (r < 0) | |
609 | return r; | |
610 | ||
6501dd31 DR |
611 | r = dnssd_load(m); |
612 | if (r < 0) | |
613 | log_warning_errno(r, "Failed to load DNS-SD configuration files: %m"); | |
614 | ||
1716f6dc | 615 | r = dns_scope_new(m, &m->unicast_scope, NULL, DNS_PROTOCOL_DNS, AF_UNSPEC); |
74b2466e LP |
616 | if (r < 0) |
617 | return r; | |
618 | ||
619 | r = manager_network_monitor_listen(m); | |
620 | if (r < 0) | |
621 | return r; | |
622 | ||
623 | r = manager_rtnl_listen(m); | |
624 | if (r < 0) | |
625 | return r; | |
626 | ||
627 | r = manager_connect_bus(m); | |
628 | if (r < 0) | |
629 | return r; | |
630 | ||
4d506d6b | 631 | (void) sd_event_add_signal(m->event, &m->sigusr1_event_source, SIGUSR1, manager_sigusr1, m); |
bc81447e | 632 | (void) sd_event_add_signal(m->event, &m->sigusr2_event_source, SIGUSR2, manager_sigusr2, m); |
d55b0463 | 633 | (void) sd_event_add_signal(m->event, &m->sigrtmin1_event_source, SIGRTMIN+1, manager_sigrtmin1, m); |
4d506d6b | 634 | |
943ef07c LP |
635 | manager_cleanup_saved_user(m); |
636 | ||
1cc6c93a | 637 | *ret = TAKE_PTR(m); |
091a364c TG |
638 | |
639 | return 0; | |
640 | } | |
641 | ||
edc501d4 LP |
642 | int manager_start(Manager *m) { |
643 | int r; | |
644 | ||
645 | assert(m); | |
646 | ||
b30bf55d LP |
647 | r = manager_dns_stub_start(m); |
648 | if (r < 0) | |
649 | return r; | |
650 | ||
edc501d4 LP |
651 | return 0; |
652 | } | |
653 | ||
74b2466e LP |
654 | Manager *manager_free(Manager *m) { |
655 | Link *l; | |
6501dd31 | 656 | DnssdService *s; |
091a364c TG |
657 | |
658 | if (!m) | |
74b2466e LP |
659 | return NULL; |
660 | ||
4b95f179 LP |
661 | dns_server_unlink_all(m->dns_servers); |
662 | dns_server_unlink_all(m->fallback_dns_servers); | |
a51c1048 LP |
663 | dns_search_domain_unlink_all(m->search_domains); |
664 | ||
74b2466e LP |
665 | while ((l = hashmap_first(m->links))) |
666 | link_free(l); | |
f0e15467 LP |
667 | |
668 | while (m->dns_queries) | |
669 | dns_query_free(m->dns_queries); | |
74b2466e | 670 | |
cab5b059 LP |
671 | dns_scope_free(m->unicast_scope); |
672 | ||
b30bf55d LP |
673 | /* At this point only orphaned streams should remain. All others should have been freed already by their |
674 | * owners */ | |
675 | while (m->dns_streams) | |
676 | dns_stream_unref(m->dns_streams); | |
677 | ||
f0e15467 LP |
678 | hashmap_free(m->links); |
679 | hashmap_free(m->dns_transactions); | |
680 | ||
096b6773 LP |
681 | sd_event_source_unref(m->network_event_source); |
682 | sd_network_monitor_unref(m->network_monitor); | |
091a364c | 683 | |
a564ca2f LP |
684 | sd_netlink_unref(m->rtnl); |
685 | sd_event_source_unref(m->rtnl_event_source); | |
686 | ||
edc501d4 | 687 | manager_llmnr_stop(m); |
bc7702b0 | 688 | manager_mdns_stop(m); |
b30bf55d | 689 | manager_dns_stub_stop(m); |
623a4c97 | 690 | |
74b2466e | 691 | sd_bus_unref(m->bus); |
091a364c | 692 | |
4d506d6b | 693 | sd_event_source_unref(m->sigusr1_event_source); |
bc81447e | 694 | sd_event_source_unref(m->sigusr2_event_source); |
d55b0463 | 695 | sd_event_source_unref(m->sigrtmin1_event_source); |
4d506d6b | 696 | |
74b2466e | 697 | sd_event_unref(m->event); |
623a4c97 | 698 | |
78c6a153 LP |
699 | dns_resource_key_unref(m->llmnr_host_ipv4_key); |
700 | dns_resource_key_unref(m->llmnr_host_ipv6_key); | |
400cb36e DR |
701 | dns_resource_key_unref(m->mdns_host_ipv4_key); |
702 | dns_resource_key_unref(m->mdns_host_ipv6_key); | |
eb60f9cd | 703 | |
eb60f9cd | 704 | sd_event_source_unref(m->hostname_event_source); |
d9fcf2ba | 705 | safe_close(m->hostname_fd); |
e96de0ce LP |
706 | |
707 | free(m->full_hostname); | |
78c6a153 LP |
708 | free(m->llmnr_hostname); |
709 | free(m->mdns_hostname); | |
eb60f9cd | 710 | |
6501dd31 DR |
711 | while ((s = hashmap_first(m->dnssd_services))) |
712 | dnssd_service_free(s); | |
713 | hashmap_free(m->dnssd_services); | |
714 | ||
0d2cd476 | 715 | dns_trust_anchor_flush(&m->trust_anchor); |
dd0bc0f1 | 716 | manager_etc_hosts_flush(m); |
0d2cd476 | 717 | |
6b430fdb | 718 | return mfree(m); |
091a364c TG |
719 | } |
720 | ||
1716f6dc | 721 | int manager_recv(Manager *m, int fd, DnsProtocol protocol, DnsPacket **ret) { |
74b2466e | 722 | _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL; |
1716f6dc LP |
723 | union { |
724 | struct cmsghdr header; /* For alignment */ | |
40a1eebd | 725 | uint8_t buffer[CMSG_SPACE(MAXSIZE(struct in_pktinfo, struct in6_pktinfo)) |
1716f6dc | 726 | + CMSG_SPACE(int) /* ttl/hoplimit */ |
623a4c97 | 727 | + EXTRA_CMSG_SPACE /* kernel appears to require extra buffer space */]; |
1716f6dc LP |
728 | } control; |
729 | union sockaddr_union sa; | |
74b2466e | 730 | struct iovec iov; |
f55f2dce YW |
731 | struct msghdr mh = { |
732 | .msg_name = &sa.sa, | |
733 | .msg_namelen = sizeof(sa), | |
734 | .msg_iov = &iov, | |
735 | .msg_iovlen = 1, | |
736 | .msg_control = &control, | |
737 | .msg_controllen = sizeof(control), | |
738 | }; | |
739 | struct cmsghdr *cmsg; | |
4edc2c9b LP |
740 | ssize_t ms, l; |
741 | int r; | |
74b2466e LP |
742 | |
743 | assert(m); | |
1716f6dc | 744 | assert(fd >= 0); |
74b2466e LP |
745 | assert(ret); |
746 | ||
4edc2c9b | 747 | ms = next_datagram_size_fd(fd); |
74b2466e | 748 | if (ms < 0) |
4edc2c9b | 749 | return ms; |
74b2466e | 750 | |
51027656 | 751 | r = dns_packet_new(&p, protocol, ms, DNS_PACKET_SIZE_MAX); |
74b2466e LP |
752 | if (r < 0) |
753 | return r; | |
754 | ||
cb310866 | 755 | iov = IOVEC_MAKE(DNS_PACKET_DATA(p), p->allocated); |
74b2466e | 756 | |
a38d9945 | 757 | l = recvmsg(fd, &mh, 0); |
74b2466e | 758 | if (l < 0) { |
4c701096 | 759 | if (IN_SET(errno, EAGAIN, EINTR)) |
74b2466e LP |
760 | return 0; |
761 | ||
762 | return -errno; | |
091a364c | 763 | } |
cb310866 LP |
764 | if (l == 0) |
765 | return 0; | |
091a364c | 766 | |
1716f6dc LP |
767 | assert(!(mh.msg_flags & MSG_CTRUNC)); |
768 | assert(!(mh.msg_flags & MSG_TRUNC)); | |
769 | ||
74b2466e | 770 | p->size = (size_t) l; |
091a364c | 771 | |
1716f6dc | 772 | p->family = sa.sa.sa_family; |
623a4c97 LP |
773 | p->ipproto = IPPROTO_UDP; |
774 | if (p->family == AF_INET) { | |
1716f6dc | 775 | p->sender.in = sa.in.sin_addr; |
623a4c97 LP |
776 | p->sender_port = be16toh(sa.in.sin_port); |
777 | } else if (p->family == AF_INET6) { | |
1716f6dc | 778 | p->sender.in6 = sa.in6.sin6_addr; |
623a4c97 LP |
779 | p->sender_port = be16toh(sa.in6.sin6_port); |
780 | p->ifindex = sa.in6.sin6_scope_id; | |
781 | } else | |
1716f6dc | 782 | return -EAFNOSUPPORT; |
74b2466e | 783 | |
2a1288ff | 784 | CMSG_FOREACH(cmsg, &mh) { |
74b2466e | 785 | |
1716f6dc LP |
786 | if (cmsg->cmsg_level == IPPROTO_IPV6) { |
787 | assert(p->family == AF_INET6); | |
74b2466e | 788 | |
1716f6dc | 789 | switch (cmsg->cmsg_type) { |
74b2466e | 790 | |
1716f6dc LP |
791 | case IPV6_PKTINFO: { |
792 | struct in6_pktinfo *i = (struct in6_pktinfo*) CMSG_DATA(cmsg); | |
74b2466e | 793 | |
623a4c97 LP |
794 | if (p->ifindex <= 0) |
795 | p->ifindex = i->ipi6_ifindex; | |
796 | ||
1716f6dc LP |
797 | p->destination.in6 = i->ipi6_addr; |
798 | break; | |
799 | } | |
74b2466e | 800 | |
1716f6dc LP |
801 | case IPV6_HOPLIMIT: |
802 | p->ttl = *(int *) CMSG_DATA(cmsg); | |
803 | break; | |
74b2466e | 804 | |
1716f6dc LP |
805 | } |
806 | } else if (cmsg->cmsg_level == IPPROTO_IP) { | |
807 | assert(p->family == AF_INET); | |
74b2466e | 808 | |
1716f6dc | 809 | switch (cmsg->cmsg_type) { |
74b2466e | 810 | |
1716f6dc LP |
811 | case IP_PKTINFO: { |
812 | struct in_pktinfo *i = (struct in_pktinfo*) CMSG_DATA(cmsg); | |
091a364c | 813 | |
623a4c97 LP |
814 | if (p->ifindex <= 0) |
815 | p->ifindex = i->ipi_ifindex; | |
816 | ||
1716f6dc LP |
817 | p->destination.in = i->ipi_addr; |
818 | break; | |
819 | } | |
74b2466e | 820 | |
623a4c97 | 821 | case IP_TTL: |
1716f6dc LP |
822 | p->ttl = *(int *) CMSG_DATA(cmsg); |
823 | break; | |
824 | } | |
825 | } | |
826 | } | |
74b2466e | 827 | |
623a4c97 LP |
828 | /* The Linux kernel sets the interface index to the loopback |
829 | * device if the packet came from the local host since it | |
830 | * avoids the routing table in such a case. Let's unset the | |
831 | * interface index in such a case. */ | |
a5f03596 | 832 | if (p->ifindex == LOOPBACK_IFINDEX) |
623a4c97 LP |
833 | p->ifindex = 0; |
834 | ||
86ad4cd7 TG |
835 | if (protocol != DNS_PROTOCOL_DNS) { |
836 | /* If we don't know the interface index still, we look for the | |
837 | * first local interface with a matching address. Yuck! */ | |
838 | if (p->ifindex <= 0) | |
839 | p->ifindex = manager_find_ifindex(m, p->family, &p->destination); | |
840 | } | |
623a4c97 | 841 | |
1cc6c93a | 842 | *ret = TAKE_PTR(p); |
74b2466e LP |
843 | |
844 | return 1; | |
845 | } | |
846 | ||
74b2466e LP |
847 | static int sendmsg_loop(int fd, struct msghdr *mh, int flags) { |
848 | int r; | |
849 | ||
850 | assert(fd >= 0); | |
851 | assert(mh); | |
852 | ||
853 | for (;;) { | |
854 | if (sendmsg(fd, mh, flags) >= 0) | |
855 | return 0; | |
856 | ||
857 | if (errno == EINTR) | |
858 | continue; | |
859 | ||
860 | if (errno != EAGAIN) | |
861 | return -errno; | |
862 | ||
863 | r = fd_wait_for_event(fd, POLLOUT, SEND_TIMEOUT_USEC); | |
864 | if (r < 0) | |
865 | return r; | |
866 | if (r == 0) | |
867 | return -ETIMEDOUT; | |
868 | } | |
869 | } | |
870 | ||
72290734 TG |
871 | static int write_loop(int fd, void *message, size_t length) { |
872 | int r; | |
873 | ||
874 | assert(fd >= 0); | |
875 | assert(message); | |
876 | ||
877 | for (;;) { | |
878 | if (write(fd, message, length) >= 0) | |
879 | return 0; | |
880 | ||
881 | if (errno == EINTR) | |
882 | continue; | |
883 | ||
884 | if (errno != EAGAIN) | |
885 | return -errno; | |
886 | ||
887 | r = fd_wait_for_event(fd, POLLOUT, SEND_TIMEOUT_USEC); | |
888 | if (r < 0) | |
889 | return r; | |
890 | if (r == 0) | |
891 | return -ETIMEDOUT; | |
892 | } | |
893 | } | |
894 | ||
895 | int manager_write(Manager *m, int fd, DnsPacket *p) { | |
896 | int r; | |
897 | ||
deb3f3d3 | 898 | log_debug("Sending %s packet with id %" PRIu16 ".", DNS_PACKET_QR(p) ? "response" : "query", DNS_PACKET_ID(p)); |
72290734 TG |
899 | |
900 | r = write_loop(fd, DNS_PACKET_DATA(p), p->size); | |
901 | if (r < 0) | |
902 | return r; | |
903 | ||
904 | return 0; | |
905 | } | |
906 | ||
b30bf55d LP |
907 | static int manager_ipv4_send( |
908 | Manager *m, | |
909 | int fd, | |
910 | int ifindex, | |
911 | const struct in_addr *destination, | |
912 | uint16_t port, | |
913 | const struct in_addr *source, | |
914 | DnsPacket *p) { | |
1716f6dc LP |
915 | union { |
916 | struct cmsghdr header; /* For alignment */ | |
917 | uint8_t buffer[CMSG_SPACE(sizeof(struct in_pktinfo))]; | |
f55f2dce YW |
918 | } control = {}; |
919 | union sockaddr_union sa; | |
74b2466e | 920 | struct iovec iov; |
f55f2dce YW |
921 | struct msghdr mh = { |
922 | .msg_iov = &iov, | |
923 | .msg_iovlen = 1, | |
924 | .msg_name = &sa.sa, | |
925 | .msg_namelen = sizeof(sa.in), | |
926 | }; | |
74b2466e LP |
927 | |
928 | assert(m); | |
1716f6dc | 929 | assert(fd >= 0); |
b30bf55d | 930 | assert(destination); |
1716f6dc | 931 | assert(port > 0); |
74b2466e LP |
932 | assert(p); |
933 | ||
cb310866 | 934 | iov = IOVEC_MAKE(DNS_PACKET_DATA(p), p->size); |
091a364c | 935 | |
f55f2dce YW |
936 | sa = (union sockaddr_union) { |
937 | .in.sin_family = AF_INET, | |
938 | .in.sin_addr = *destination, | |
939 | .in.sin_port = htobe16(port), | |
940 | }; | |
091a364c | 941 | |
74b2466e LP |
942 | if (ifindex > 0) { |
943 | struct cmsghdr *cmsg; | |
944 | struct in_pktinfo *pi; | |
945 | ||
1716f6dc | 946 | mh.msg_control = &control; |
74b2466e LP |
947 | mh.msg_controllen = CMSG_LEN(sizeof(struct in_pktinfo)); |
948 | ||
949 | cmsg = CMSG_FIRSTHDR(&mh); | |
950 | cmsg->cmsg_len = mh.msg_controllen; | |
951 | cmsg->cmsg_level = IPPROTO_IP; | |
952 | cmsg->cmsg_type = IP_PKTINFO; | |
953 | ||
954 | pi = (struct in_pktinfo*) CMSG_DATA(cmsg); | |
955 | pi->ipi_ifindex = ifindex; | |
b30bf55d LP |
956 | |
957 | if (source) | |
958 | pi->ipi_spec_dst = *source; | |
74b2466e LP |
959 | } |
960 | ||
961 | return sendmsg_loop(fd, &mh, 0); | |
962 | } | |
963 | ||
b30bf55d LP |
964 | static int manager_ipv6_send( |
965 | Manager *m, | |
966 | int fd, | |
967 | int ifindex, | |
968 | const struct in6_addr *destination, | |
969 | uint16_t port, | |
970 | const struct in6_addr *source, | |
971 | DnsPacket *p) { | |
972 | ||
1716f6dc LP |
973 | union { |
974 | struct cmsghdr header; /* For alignment */ | |
975 | uint8_t buffer[CMSG_SPACE(sizeof(struct in6_pktinfo))]; | |
f55f2dce YW |
976 | } control = {}; |
977 | union sockaddr_union sa; | |
74b2466e | 978 | struct iovec iov; |
f55f2dce YW |
979 | struct msghdr mh = { |
980 | .msg_iov = &iov, | |
981 | .msg_iovlen = 1, | |
982 | .msg_name = &sa.sa, | |
983 | .msg_namelen = sizeof(sa.in6), | |
984 | }; | |
74b2466e LP |
985 | |
986 | assert(m); | |
1716f6dc | 987 | assert(fd >= 0); |
b30bf55d | 988 | assert(destination); |
1716f6dc | 989 | assert(port > 0); |
74b2466e LP |
990 | assert(p); |
991 | ||
cb310866 | 992 | iov = IOVEC_MAKE(DNS_PACKET_DATA(p), p->size); |
74b2466e | 993 | |
f55f2dce YW |
994 | sa = (union sockaddr_union) { |
995 | .in6.sin6_family = AF_INET6, | |
996 | .in6.sin6_addr = *destination, | |
997 | .in6.sin6_port = htobe16(port), | |
998 | .in6.sin6_scope_id = ifindex, | |
999 | }; | |
74b2466e LP |
1000 | |
1001 | if (ifindex > 0) { | |
1002 | struct cmsghdr *cmsg; | |
1003 | struct in6_pktinfo *pi; | |
1004 | ||
1716f6dc | 1005 | mh.msg_control = &control; |
74b2466e LP |
1006 | mh.msg_controllen = CMSG_LEN(sizeof(struct in6_pktinfo)); |
1007 | ||
1008 | cmsg = CMSG_FIRSTHDR(&mh); | |
1009 | cmsg->cmsg_len = mh.msg_controllen; | |
1010 | cmsg->cmsg_level = IPPROTO_IPV6; | |
1011 | cmsg->cmsg_type = IPV6_PKTINFO; | |
1012 | ||
1013 | pi = (struct in6_pktinfo*) CMSG_DATA(cmsg); | |
1014 | pi->ipi6_ifindex = ifindex; | |
b30bf55d LP |
1015 | |
1016 | if (source) | |
1017 | pi->ipi6_addr = *source; | |
74b2466e LP |
1018 | } |
1019 | ||
1020 | return sendmsg_loop(fd, &mh, 0); | |
1021 | } | |
1022 | ||
b30bf55d LP |
1023 | int manager_send( |
1024 | Manager *m, | |
1025 | int fd, | |
1026 | int ifindex, | |
1027 | int family, | |
1028 | const union in_addr_union *destination, | |
1029 | uint16_t port, | |
1030 | const union in_addr_union *source, | |
1031 | DnsPacket *p) { | |
1032 | ||
1716f6dc LP |
1033 | assert(m); |
1034 | assert(fd >= 0); | |
b30bf55d | 1035 | assert(destination); |
1716f6dc LP |
1036 | assert(port > 0); |
1037 | assert(p); | |
1038 | ||
deb3f3d3 | 1039 | log_debug("Sending %s packet with id %" PRIu16 " on interface %i/%s.", DNS_PACKET_QR(p) ? "response" : "query", DNS_PACKET_ID(p), ifindex, af_to_name(family)); |
a2a416f7 | 1040 | |
1716f6dc | 1041 | if (family == AF_INET) |
25270cf3 | 1042 | return manager_ipv4_send(m, fd, ifindex, &destination->in, port, source ? &source->in : NULL, p); |
2817157b | 1043 | if (family == AF_INET6) |
25270cf3 | 1044 | return manager_ipv6_send(m, fd, ifindex, &destination->in6, port, source ? &source->in6 : NULL, p); |
1716f6dc LP |
1045 | |
1046 | return -EAFNOSUPPORT; | |
1047 | } | |
1048 | ||
e1c95994 LP |
1049 | uint32_t manager_find_mtu(Manager *m) { |
1050 | uint32_t mtu = 0; | |
1051 | Link *l; | |
1052 | Iterator i; | |
1053 | ||
1054 | /* If we don't know on which link a DNS packet would be | |
1055 | * delivered, let's find the largest MTU that works on all | |
1056 | * interfaces we know of */ | |
1057 | ||
1058 | HASHMAP_FOREACH(l, m->links, i) { | |
1059 | if (l->mtu <= 0) | |
1060 | continue; | |
1061 | ||
1062 | if (mtu <= 0 || l->mtu < mtu) | |
1063 | mtu = l->mtu; | |
1064 | } | |
1065 | ||
1066 | return mtu; | |
1067 | } | |
1716f6dc | 1068 | |
623a4c97 | 1069 | int manager_find_ifindex(Manager *m, int family, const union in_addr_union *in_addr) { |
ec2c5e43 LP |
1070 | LinkAddress *a; |
1071 | ||
1072 | assert(m); | |
1073 | ||
4e945a6f | 1074 | a = manager_find_link_address(m, family, in_addr); |
ec2c5e43 LP |
1075 | if (a) |
1076 | return a->link->ifindex; | |
1077 | ||
1078 | return 0; | |
1079 | } | |
1080 | ||
eb60f9cd LP |
1081 | void manager_refresh_rrs(Manager *m) { |
1082 | Iterator i; | |
1083 | Link *l; | |
6db6a464 | 1084 | DnssdService *s; |
eb60f9cd LP |
1085 | |
1086 | assert(m); | |
1087 | ||
78c6a153 LP |
1088 | m->llmnr_host_ipv4_key = dns_resource_key_unref(m->llmnr_host_ipv4_key); |
1089 | m->llmnr_host_ipv6_key = dns_resource_key_unref(m->llmnr_host_ipv6_key); | |
400cb36e DR |
1090 | m->mdns_host_ipv4_key = dns_resource_key_unref(m->mdns_host_ipv4_key); |
1091 | m->mdns_host_ipv6_key = dns_resource_key_unref(m->mdns_host_ipv6_key); | |
eb60f9cd | 1092 | |
6db6a464 DR |
1093 | if (m->mdns_support == RESOLVE_SUPPORT_YES) |
1094 | HASHMAP_FOREACH(s, m->dnssd_services, i) | |
1095 | if (dnssd_update_rrs(s) < 0) | |
1096 | log_warning("Failed to refresh DNS-SD service '%s'", s->name); | |
1097 | ||
eb60f9cd LP |
1098 | HASHMAP_FOREACH(l, m->links, i) { |
1099 | link_add_rrs(l, true); | |
1100 | link_add_rrs(l, false); | |
1101 | } | |
1102 | } | |
1103 | ||
e7c1b0e4 | 1104 | static int manager_next_random_name(const char *old, char **ret_new) { |
ec2c5e43 | 1105 | const char *p; |
556a2294 | 1106 | uint64_t u, a; |
e7c1b0e4 | 1107 | char *n; |
623a4c97 | 1108 | |
e7c1b0e4 | 1109 | p = strchr(old, 0); |
ec2c5e43 LP |
1110 | assert(p); |
1111 | ||
e7c1b0e4 DR |
1112 | while (p > old) { |
1113 | if (!strchr(DIGITS, p[-1])) | |
ec2c5e43 LP |
1114 | break; |
1115 | ||
1116 | p--; | |
1117 | } | |
1118 | ||
1119 | if (*p == 0 || safe_atou64(p, &u) < 0 || u <= 0) | |
1120 | u = 1; | |
1121 | ||
556a2294 LP |
1122 | /* Add a random number to the old value. This way we can avoid |
1123 | * that two hosts pick the same hostname, win on IPv4 and lose | |
1124 | * on IPv6 (or vice versa), and pick the same hostname | |
1125 | * replacement hostname, ad infinitum. We still want the | |
1126 | * numbers to go up monotonically, hence we just add a random | |
1127 | * value 1..10 */ | |
1128 | ||
1129 | random_bytes(&a, sizeof(a)); | |
1130 | u += 1 + a % 10; | |
ec2c5e43 | 1131 | |
e7c1b0e4 | 1132 | if (asprintf(&n, "%.*s%" PRIu64, (int) (p - old), old, u) < 0) |
ec2c5e43 LP |
1133 | return -ENOMEM; |
1134 | ||
e7c1b0e4 DR |
1135 | *ret_new = n; |
1136 | ||
1137 | return 0; | |
1138 | } | |
1139 | ||
1140 | int manager_next_hostname(Manager *m) { | |
1141 | _cleanup_free_ char *h = NULL, *k = NULL; | |
1142 | int r; | |
1143 | ||
1144 | assert(m); | |
1145 | ||
1146 | r = manager_next_random_name(m->llmnr_hostname, &h); | |
1147 | if (r < 0) | |
1148 | return r; | |
1149 | ||
78c6a153 | 1150 | r = dns_name_concat(h, "local", &k); |
e7c1b0e4 | 1151 | if (r < 0) |
78c6a153 | 1152 | return r; |
78c6a153 LP |
1153 | |
1154 | log_info("Hostname conflict, changing published hostname from '%s' to '%s'.", m->llmnr_hostname, h); | |
1155 | ||
e7c1b0e4 DR |
1156 | free_and_replace(m->llmnr_hostname, h); |
1157 | free_and_replace(m->mdns_hostname, k); | |
ec2c5e43 | 1158 | |
eb60f9cd | 1159 | manager_refresh_rrs(m); |
623a4c97 LP |
1160 | |
1161 | return 0; | |
1162 | } | |
ec2c5e43 | 1163 | |
4e945a6f | 1164 | LinkAddress* manager_find_link_address(Manager *m, int family, const union in_addr_union *in_addr) { |
ec2c5e43 LP |
1165 | Iterator i; |
1166 | Link *l; | |
1167 | ||
1168 | assert(m); | |
1169 | ||
1170 | HASHMAP_FOREACH(l, m->links, i) { | |
1171 | LinkAddress *a; | |
1172 | ||
1173 | a = link_find_address(l, family, in_addr); | |
1174 | if (a) | |
1175 | return a; | |
1176 | } | |
1177 | ||
1178 | return NULL; | |
1179 | } | |
1180 | ||
a4076574 | 1181 | bool manager_our_packet(Manager *m, DnsPacket *p) { |
ec2c5e43 LP |
1182 | assert(m); |
1183 | assert(p); | |
1184 | ||
4e945a6f | 1185 | return !!manager_find_link_address(m, p->family, &p->sender); |
ec2c5e43 | 1186 | } |
4e945a6f | 1187 | |
a4076574 LP |
1188 | DnsScope* manager_find_scope(Manager *m, DnsPacket *p) { |
1189 | Link *l; | |
1190 | ||
1191 | assert(m); | |
1192 | assert(p); | |
1193 | ||
1194 | l = hashmap_get(m->links, INT_TO_PTR(p->ifindex)); | |
1195 | if (!l) | |
1196 | return NULL; | |
1197 | ||
b4f1862d DM |
1198 | switch (p->protocol) { |
1199 | case DNS_PROTOCOL_LLMNR: | |
a4076574 LP |
1200 | if (p->family == AF_INET) |
1201 | return l->llmnr_ipv4_scope; | |
1202 | else if (p->family == AF_INET6) | |
1203 | return l->llmnr_ipv6_scope; | |
b4f1862d DM |
1204 | |
1205 | break; | |
1206 | ||
1207 | case DNS_PROTOCOL_MDNS: | |
1208 | if (p->family == AF_INET) | |
1209 | return l->mdns_ipv4_scope; | |
1210 | else if (p->family == AF_INET6) | |
1211 | return l->mdns_ipv6_scope; | |
1212 | ||
1213 | break; | |
1214 | ||
1215 | default: | |
1216 | break; | |
a4076574 LP |
1217 | } |
1218 | ||
1219 | return NULL; | |
1220 | } | |
1221 | ||
902bb5d8 LP |
1222 | void manager_verify_all(Manager *m) { |
1223 | DnsScope *s; | |
1224 | ||
1225 | assert(m); | |
1226 | ||
1227 | LIST_FOREACH(scopes, s, m->dns_scopes) | |
1228 | dns_zone_verify_all(&s->zone); | |
1229 | } | |
1230 | ||
78c6a153 | 1231 | int manager_is_own_hostname(Manager *m, const char *name) { |
78c6a153 LP |
1232 | int r; |
1233 | ||
1234 | assert(m); | |
1235 | assert(name); | |
1236 | ||
1237 | if (m->llmnr_hostname) { | |
1238 | r = dns_name_equal(name, m->llmnr_hostname); | |
1239 | if (r != 0) | |
1240 | return r; | |
1241 | } | |
1242 | ||
e96de0ce LP |
1243 | if (m->mdns_hostname) { |
1244 | r = dns_name_equal(name, m->mdns_hostname); | |
1245 | if (r != 0) | |
1246 | return r; | |
1247 | } | |
1248 | ||
1249 | if (m->full_hostname) | |
1250 | return dns_name_equal(name, m->full_hostname); | |
78c6a153 LP |
1251 | |
1252 | return 0; | |
1253 | } | |
1254 | ||
9176a57c LP |
1255 | int manager_compile_dns_servers(Manager *m, OrderedSet **dns) { |
1256 | DnsServer *s; | |
1257 | Iterator i; | |
1258 | Link *l; | |
1259 | int r; | |
1260 | ||
1261 | assert(m); | |
1262 | assert(dns); | |
1263 | ||
1264 | r = ordered_set_ensure_allocated(dns, &dns_server_hash_ops); | |
1265 | if (r < 0) | |
1266 | return r; | |
1267 | ||
1268 | /* First add the system-wide servers and domains */ | |
1269 | LIST_FOREACH(servers, s, m->dns_servers) { | |
1270 | r = ordered_set_put(*dns, s); | |
1271 | if (r == -EEXIST) | |
1272 | continue; | |
1273 | if (r < 0) | |
1274 | return r; | |
1275 | } | |
1276 | ||
1277 | /* Then, add the per-link servers */ | |
1278 | HASHMAP_FOREACH(l, m->links, i) { | |
1279 | LIST_FOREACH(servers, s, l->dns_servers) { | |
1280 | r = ordered_set_put(*dns, s); | |
1281 | if (r == -EEXIST) | |
1282 | continue; | |
1283 | if (r < 0) | |
1284 | return r; | |
1285 | } | |
1286 | } | |
1287 | ||
1288 | /* If we found nothing, add the fallback servers */ | |
1289 | if (ordered_set_isempty(*dns)) { | |
1290 | LIST_FOREACH(servers, s, m->fallback_dns_servers) { | |
1291 | r = ordered_set_put(*dns, s); | |
1292 | if (r == -EEXIST) | |
1293 | continue; | |
1294 | if (r < 0) | |
1295 | return r; | |
1296 | } | |
1297 | } | |
1298 | ||
1299 | return 0; | |
1300 | } | |
1301 | ||
94363cbb MP |
1302 | /* filter_route is a tri-state: |
1303 | * < 0: no filtering | |
1304 | * = 0 or false: return only domains which should be used for searching | |
1305 | * > 0 or true: return only domains which are for routing only | |
1306 | */ | |
6f7da49d | 1307 | int manager_compile_search_domains(Manager *m, OrderedSet **domains, int filter_route) { |
9176a57c LP |
1308 | DnsSearchDomain *d; |
1309 | Iterator i; | |
1310 | Link *l; | |
1311 | int r; | |
1312 | ||
1313 | assert(m); | |
1314 | assert(domains); | |
1315 | ||
1316 | r = ordered_set_ensure_allocated(domains, &dns_name_hash_ops); | |
1317 | if (r < 0) | |
1318 | return r; | |
1319 | ||
1320 | LIST_FOREACH(domains, d, m->search_domains) { | |
6f7da49d LP |
1321 | |
1322 | if (filter_route >= 0 && | |
1323 | d->route_only != !!filter_route) | |
1324 | continue; | |
1325 | ||
9176a57c LP |
1326 | r = ordered_set_put(*domains, d->name); |
1327 | if (r == -EEXIST) | |
1328 | continue; | |
1329 | if (r < 0) | |
1330 | return r; | |
1331 | } | |
1332 | ||
1333 | HASHMAP_FOREACH(l, m->links, i) { | |
1334 | ||
1335 | LIST_FOREACH(domains, d, l->search_domains) { | |
6f7da49d LP |
1336 | |
1337 | if (filter_route >= 0 && | |
1338 | d->route_only != !!filter_route) | |
1339 | continue; | |
1340 | ||
9176a57c LP |
1341 | r = ordered_set_put(*domains, d->name); |
1342 | if (r == -EEXIST) | |
1343 | continue; | |
1344 | if (r < 0) | |
1345 | return r; | |
1346 | } | |
1347 | } | |
1348 | ||
1349 | return 0; | |
1350 | } | |
c69fa7e3 LP |
1351 | |
1352 | DnssecMode manager_get_dnssec_mode(Manager *m) { | |
1353 | assert(m); | |
1354 | ||
1355 | if (m->dnssec_mode != _DNSSEC_MODE_INVALID) | |
1356 | return m->dnssec_mode; | |
1357 | ||
1358 | return DNSSEC_NO; | |
1359 | } | |
1360 | ||
1361 | bool manager_dnssec_supported(Manager *m) { | |
1362 | DnsServer *server; | |
1363 | Iterator i; | |
1364 | Link *l; | |
1365 | ||
1366 | assert(m); | |
1367 | ||
1368 | if (manager_get_dnssec_mode(m) == DNSSEC_NO) | |
1369 | return false; | |
1370 | ||
1371 | server = manager_get_dns_server(m); | |
1372 | if (server && !dns_server_dnssec_supported(server)) | |
1373 | return false; | |
1374 | ||
1375 | HASHMAP_FOREACH(l, m->links, i) | |
1376 | if (!link_dnssec_supported(l)) | |
1377 | return false; | |
1378 | ||
1379 | return true; | |
1380 | } | |
59c5b597 | 1381 | |
c9299be2 | 1382 | DnsOverTlsMode manager_get_dns_over_tls_mode(Manager *m) { |
5d67a7ae IT |
1383 | assert(m); |
1384 | ||
c9299be2 IT |
1385 | if (m->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID) |
1386 | return m->dns_over_tls_mode; | |
5d67a7ae | 1387 | |
c9299be2 | 1388 | return DNS_OVER_TLS_NO; |
5d67a7ae IT |
1389 | } |
1390 | ||
59c5b597 LP |
1391 | void manager_dnssec_verdict(Manager *m, DnssecVerdict verdict, const DnsResourceKey *key) { |
1392 | ||
1393 | assert(verdict >= 0); | |
1394 | assert(verdict < _DNSSEC_VERDICT_MAX); | |
1395 | ||
f1d34068 | 1396 | if (DEBUG_LOGGING) { |
202b76ae | 1397 | char s[DNS_RESOURCE_KEY_STRING_MAX]; |
59c5b597 | 1398 | |
202b76ae ZJS |
1399 | log_debug("Found verdict for lookup %s: %s", |
1400 | dns_resource_key_to_string(key, s, sizeof s), | |
1401 | dnssec_verdict_to_string(verdict)); | |
59c5b597 LP |
1402 | } |
1403 | ||
1404 | m->n_dnssec_verdict[verdict]++; | |
1405 | } | |
011696f7 LP |
1406 | |
1407 | bool manager_routable(Manager *m, int family) { | |
1408 | Iterator i; | |
1409 | Link *l; | |
1410 | ||
1411 | assert(m); | |
1412 | ||
1413 | /* Returns true if the host has at least one interface with a routable address of the specified type */ | |
1414 | ||
1415 | HASHMAP_FOREACH(l, m->links, i) | |
1416 | if (link_relevant(l, family, false)) | |
1417 | return true; | |
1418 | ||
1419 | return false; | |
1420 | } | |
ba35662f LP |
1421 | |
1422 | void manager_flush_caches(Manager *m) { | |
1423 | DnsScope *scope; | |
1424 | ||
1425 | assert(m); | |
1426 | ||
1427 | LIST_FOREACH(scopes, scope, m->dns_scopes) | |
1428 | dns_cache_flush(&scope->cache); | |
aac57b35 ZJS |
1429 | |
1430 | log_info("Flushed all caches."); | |
ba35662f | 1431 | } |
943ef07c | 1432 | |
59c0fd0e LP |
1433 | void manager_reset_server_features(Manager *m) { |
1434 | Iterator i; | |
1435 | Link *l; | |
1436 | ||
1437 | dns_server_reset_features_all(m->dns_servers); | |
1438 | dns_server_reset_features_all(m->fallback_dns_servers); | |
1439 | ||
1440 | HASHMAP_FOREACH(l, m->links, i) | |
1441 | dns_server_reset_features_all(l->dns_servers); | |
1442 | ||
1443 | log_info("Resetting learnt feature levels on all servers."); | |
1444 | } | |
1445 | ||
943ef07c LP |
1446 | void manager_cleanup_saved_user(Manager *m) { |
1447 | _cleanup_closedir_ DIR *d = NULL; | |
1448 | struct dirent *de; | |
1449 | int r; | |
1450 | ||
1451 | assert(m); | |
1452 | ||
1453 | /* Clean up all saved per-link files in /run/systemd/resolve/netif/ that don't have a matching interface | |
1454 | * anymore. These files are created to persist settings pushed in by the user via the bus, so that resolved can | |
1455 | * be restarted without losing this data. */ | |
1456 | ||
1457 | d = opendir("/run/systemd/resolve/netif/"); | |
1458 | if (!d) { | |
1459 | if (errno == ENOENT) | |
1460 | return; | |
1461 | ||
1462 | log_warning_errno(errno, "Failed to open interface directory: %m"); | |
1463 | return; | |
1464 | } | |
1465 | ||
1466 | FOREACH_DIRENT_ALL(de, d, log_error_errno(errno, "Failed to read interface directory: %m")) { | |
1467 | _cleanup_free_ char *p = NULL; | |
1468 | int ifindex; | |
1469 | Link *l; | |
1470 | ||
1471 | if (!IN_SET(de->d_type, DT_UNKNOWN, DT_REG)) | |
1472 | continue; | |
1473 | ||
49bfc877 | 1474 | if (dot_or_dot_dot(de->d_name)) |
943ef07c LP |
1475 | continue; |
1476 | ||
1477 | r = parse_ifindex(de->d_name, &ifindex); | |
1478 | if (r < 0) /* Probably some temporary file from a previous run. Delete it */ | |
1479 | goto rm; | |
1480 | ||
1481 | l = hashmap_get(m->links, INT_TO_PTR(ifindex)); | |
1482 | if (!l) /* link vanished */ | |
1483 | goto rm; | |
1484 | ||
1485 | if (l->is_managed) /* now managed by networkd, hence the bus settings are useless */ | |
1486 | goto rm; | |
1487 | ||
1488 | continue; | |
1489 | ||
1490 | rm: | |
1491 | p = strappend("/run/systemd/resolve/netif/", de->d_name); | |
1492 | if (!p) { | |
1493 | log_oom(); | |
1494 | return; | |
1495 | } | |
1496 | ||
1497 | (void) unlink(p); | |
1498 | } | |
1499 | } | |
e7c1b0e4 DR |
1500 | |
1501 | bool manager_next_dnssd_names(Manager *m) { | |
1502 | Iterator i; | |
1503 | DnssdService *s; | |
1504 | bool tried = false; | |
1505 | int r; | |
1506 | ||
1507 | assert(m); | |
1508 | ||
1509 | HASHMAP_FOREACH(s, m->dnssd_services, i) { | |
1510 | _cleanup_free_ char * new_name = NULL; | |
1511 | ||
1512 | if (!s->withdrawn) | |
1513 | continue; | |
1514 | ||
1515 | r = manager_next_random_name(s->name_template, &new_name); | |
1516 | if (r < 0) { | |
1517 | log_warning_errno(r, "Failed to get new name for service '%s': %m", s->name); | |
1518 | continue; | |
1519 | } | |
1520 | ||
1521 | free_and_replace(s->name_template, new_name); | |
1522 | ||
1523 | s->withdrawn = false; | |
1524 | ||
1525 | tried = true; | |
1526 | } | |
1527 | ||
1528 | if (tried) | |
1529 | manager_refresh_rrs(m); | |
1530 | ||
1531 | return tried; | |
1532 | } |