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091a364c TG |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2014 Tom Gundersen <teg@jklm.no> | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | #include <arpa/inet.h> | |
23 | #include <resolv.h> | |
24 | #include <linux/if.h> | |
74b2466e LP |
25 | #include <sys/ioctl.h> |
26 | #include <sys/poll.h> | |
27 | #include <netinet/in.h> | |
091a364c | 28 | |
74b2466e | 29 | #include "rtnl-util.h" |
091a364c TG |
30 | #include "event-util.h" |
31 | #include "network-util.h" | |
32 | #include "sd-dhcp-lease.h" | |
33 | #include "dhcp-lease-internal.h" | |
34 | #include "network-internal.h" | |
35 | #include "conf-parser.h" | |
74b2466e LP |
36 | #include "socket-util.h" |
37 | #include "resolved.h" | |
38 | ||
39 | #define SEND_TIMEOUT_USEC (200 * USEC_PER_MSEC) | |
40 | ||
41 | static int manager_process_link(sd_rtnl *rtnl, sd_rtnl_message *mm, void *userdata) { | |
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 | ||
51 | r = sd_rtnl_message_get_type(mm, &type); | |
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 | ||
63 | case RTM_NEWLINK: | |
64 | if (!l) { | |
65 | log_debug("Found link %i", ifindex); | |
66 | ||
67 | r = link_new(m, &l, ifindex); | |
68 | if (r < 0) | |
69 | goto fail; | |
70 | } | |
71 | ||
72 | r = link_update_rtnl(l, mm); | |
73 | if (r < 0) | |
74 | goto fail; | |
75 | ||
76 | break; | |
77 | ||
78 | case RTM_DELLINK: | |
79 | if (l) { | |
80 | log_debug("Removing link %i", l->ifindex); | |
81 | link_free(l); | |
82 | } | |
83 | ||
84 | break; | |
85 | } | |
86 | ||
87 | return 0; | |
88 | ||
89 | fail: | |
90 | log_warning("Failed to process RTNL link message: %s", strerror(-r)); | |
91 | return 0; | |
92 | } | |
93 | ||
94 | static int manager_process_address(sd_rtnl *rtnl, sd_rtnl_message *mm, void *userdata) { | |
95 | Manager *m = userdata; | |
96 | union in_addr_union address; | |
97 | unsigned char family; | |
98 | uint16_t type; | |
99 | int r, ifindex; | |
100 | LinkAddress *a; | |
101 | Link *l; | |
102 | ||
103 | assert(rtnl); | |
104 | assert(mm); | |
105 | assert(m); | |
106 | ||
107 | r = sd_rtnl_message_get_type(mm, &type); | |
108 | if (r < 0) | |
109 | goto fail; | |
110 | ||
111 | r = sd_rtnl_message_addr_get_ifindex(mm, &ifindex); | |
112 | if (r < 0) | |
113 | goto fail; | |
114 | ||
115 | l = hashmap_get(m->links, INT_TO_PTR(ifindex)); | |
116 | if (!l) | |
117 | return 0; | |
118 | ||
119 | r = sd_rtnl_message_addr_get_family(mm, &family); | |
120 | if (r < 0) | |
121 | goto fail; | |
122 | ||
123 | switch (family) { | |
124 | ||
125 | case AF_INET: | |
126 | r = sd_rtnl_message_read_in_addr(mm, IFA_LOCAL, &address.in); | |
127 | if (r < 0) { | |
128 | r = sd_rtnl_message_read_in_addr(mm, IFA_ADDRESS, &address.in); | |
129 | if (r < 0) | |
130 | goto fail; | |
131 | } | |
132 | ||
133 | break; | |
134 | ||
135 | case AF_INET6: | |
136 | r = sd_rtnl_message_read_in6_addr(mm, IFA_LOCAL, &address.in6); | |
137 | if (r < 0) { | |
138 | r = sd_rtnl_message_read_in6_addr(mm, IFA_ADDRESS, &address.in6); | |
139 | if (r < 0) | |
140 | goto fail; | |
141 | } | |
142 | ||
143 | break; | |
144 | ||
145 | default: | |
146 | return 0; | |
147 | } | |
148 | ||
149 | a = link_find_address(l, family, &address); | |
150 | ||
151 | switch (type) { | |
152 | ||
153 | case RTM_NEWADDR: | |
154 | ||
155 | if (!a) { | |
156 | r = link_address_new(l, &a, family, &address); | |
157 | if (r < 0) | |
158 | return r; | |
159 | } | |
160 | ||
161 | r = link_address_update_rtnl(a, mm); | |
162 | if (r < 0) | |
163 | return r; | |
164 | ||
165 | break; | |
166 | ||
167 | case RTM_DELADDR: | |
168 | if (a) | |
169 | link_address_free(a); | |
170 | break; | |
171 | } | |
172 | ||
173 | return 0; | |
174 | ||
175 | fail: | |
176 | log_warning("Failed to process RTNL address message: %s", strerror(-r)); | |
177 | return 0; | |
178 | } | |
179 | ||
180 | ||
181 | static int manager_rtnl_listen(Manager *m) { | |
182 | _cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL, *reply = NULL; | |
183 | sd_rtnl_message *i; | |
184 | int r; | |
185 | ||
186 | assert(m); | |
187 | ||
188 | /* First, subscibe to interfaces coming and going */ | |
189 | r = sd_rtnl_open(&m->rtnl, 3, RTNLGRP_LINK, RTNLGRP_IPV4_IFADDR, RTNLGRP_IPV6_IFADDR); | |
190 | if (r < 0) | |
191 | return r; | |
192 | ||
193 | r = sd_rtnl_attach_event(m->rtnl, m->event, 0); | |
194 | if (r < 0) | |
195 | return r; | |
196 | ||
197 | r = sd_rtnl_add_match(m->rtnl, RTM_NEWLINK, manager_process_link, m); | |
198 | if (r < 0) | |
199 | return r; | |
200 | ||
201 | r = sd_rtnl_add_match(m->rtnl, RTM_DELLINK, manager_process_link, m); | |
202 | if (r < 0) | |
203 | return r; | |
204 | ||
205 | r = sd_rtnl_add_match(m->rtnl, RTM_NEWADDR, manager_process_address, m); | |
206 | if (r < 0) | |
207 | return r; | |
091a364c | 208 | |
74b2466e LP |
209 | r = sd_rtnl_add_match(m->rtnl, RTM_DELADDR, manager_process_address, m); |
210 | if (r < 0) | |
211 | return r; | |
212 | ||
213 | /* Then, enumerate all links */ | |
214 | r = sd_rtnl_message_new_link(m->rtnl, &req, RTM_GETLINK, 0); | |
215 | if (r < 0) | |
216 | return r; | |
217 | ||
218 | r = sd_rtnl_message_request_dump(req, true); | |
219 | if (r < 0) | |
220 | return r; | |
221 | ||
222 | r = sd_rtnl_call(m->rtnl, req, 0, &reply); | |
223 | if (r < 0) | |
224 | return r; | |
225 | ||
226 | for (i = reply; i; i = sd_rtnl_message_next(i)) { | |
227 | r = manager_process_link(m->rtnl, i, m); | |
228 | if (r < 0) | |
229 | return r; | |
230 | } | |
231 | ||
232 | req = sd_rtnl_message_unref(req); | |
233 | reply = sd_rtnl_message_unref(reply); | |
234 | ||
235 | /* Finally, enumerate all addresses, too */ | |
236 | r = sd_rtnl_message_new_addr(m->rtnl, &req, RTM_GETADDR, 0, AF_UNSPEC); | |
237 | if (r < 0) | |
238 | return r; | |
239 | ||
240 | r = sd_rtnl_message_request_dump(req, true); | |
241 | if (r < 0) | |
242 | return r; | |
243 | ||
244 | r = sd_rtnl_call(m->rtnl, req, 0, &reply); | |
245 | if (r < 0) | |
246 | return r; | |
247 | ||
248 | for (i = reply; i; i = sd_rtnl_message_next(i)) { | |
249 | r = manager_process_address(m->rtnl, i, m); | |
250 | if (r < 0) | |
251 | return r; | |
252 | } | |
253 | ||
254 | return r; | |
255 | } | |
256 | ||
257 | static int on_network_event(sd_event_source *s, int fd, uint32_t revents, void *userdata) { | |
258 | Manager *m = userdata; | |
259 | Iterator i; | |
260 | Link *l; | |
261 | int r; | |
262 | ||
263 | assert(m); | |
264 | ||
265 | sd_network_monitor_flush(m->network_monitor); | |
266 | ||
267 | HASHMAP_FOREACH(l, m->links, i) { | |
268 | r = link_update_monitor(l); | |
269 | if (r < 0) | |
270 | log_warning("Failed to update monitor information for %i: %s", l->ifindex, strerror(-r)); | |
271 | } | |
272 | ||
273 | r = manager_write_resolv_conf(m); | |
274 | if (r < 0) | |
275 | log_warning("Could not update resolv.conf: %s", strerror(-r)); | |
276 | ||
277 | return 0; | |
278 | } | |
279 | ||
280 | static int manager_network_monitor_listen(Manager *m) { | |
281 | int r, fd, events; | |
282 | ||
283 | assert(m); | |
284 | ||
285 | r = sd_network_monitor_new(NULL, &m->network_monitor); | |
286 | if (r < 0) | |
287 | return r; | |
288 | ||
289 | fd = sd_network_monitor_get_fd(m->network_monitor); | |
290 | if (fd < 0) | |
291 | return fd; | |
292 | ||
293 | events = sd_network_monitor_get_events(m->network_monitor); | |
294 | if (events < 0) | |
295 | return events; | |
296 | ||
297 | r = sd_event_add_io(m->event, &m->network_event_source, fd, events, &on_network_event, m); | |
298 | if (r < 0) | |
299 | return r; | |
300 | ||
301 | return 0; | |
302 | } | |
303 | ||
304 | static int parse_dns_server_string(Manager *m, const char *string) { | |
091a364c TG |
305 | char *word, *state; |
306 | size_t length; | |
307 | int r; | |
308 | ||
309 | assert(m); | |
310 | assert(string); | |
311 | ||
312 | FOREACH_WORD_QUOTED(word, length, string, state) { | |
74b2466e LP |
313 | char buffer[length+1]; |
314 | unsigned family; | |
315 | union in_addr_union addr; | |
091a364c | 316 | |
74b2466e LP |
317 | memcpy(buffer, word, length); |
318 | buffer[length] = 0; | |
091a364c | 319 | |
74b2466e | 320 | r = in_addr_from_string_auto(buffer, &family, &addr); |
091a364c | 321 | if (r < 0) { |
74b2466e | 322 | log_warning("Ignoring invalid DNS address '%s'", buffer); |
091a364c TG |
323 | continue; |
324 | } | |
325 | ||
74b2466e LP |
326 | /* filter out duplicates */ |
327 | if (manager_find_dns_server(m, family, &addr)) | |
328 | continue; | |
329 | ||
330 | r = dns_server_new(m, NULL, DNS_SERVER_SYSTEM, NULL, family, &addr); | |
331 | if (r < 0) | |
332 | return r; | |
091a364c TG |
333 | } |
334 | ||
335 | return 0; | |
336 | } | |
337 | ||
338 | int config_parse_dnsv( | |
339 | const char *unit, | |
340 | const char *filename, | |
341 | unsigned line, | |
342 | const char *section, | |
343 | unsigned section_line, | |
344 | const char *lvalue, | |
345 | int ltype, | |
346 | const char *rvalue, | |
347 | void *data, | |
348 | void *userdata) { | |
349 | ||
350 | Manager *m = userdata; | |
74b2466e | 351 | int r; |
091a364c TG |
352 | |
353 | assert(filename); | |
354 | assert(lvalue); | |
355 | assert(rvalue); | |
356 | assert(m); | |
357 | ||
74b2466e LP |
358 | /* Empty assignment means clear the list */ |
359 | if (isempty(rvalue)) { | |
360 | while (m->dns_servers) | |
361 | dns_server_free(m->dns_servers); | |
362 | ||
363 | return 0; | |
091a364c TG |
364 | } |
365 | ||
74b2466e LP |
366 | r = parse_dns_server_string(m, rvalue); |
367 | if (r < 0) { | |
368 | log_error("Failed to parse DNS server string"); | |
369 | return r; | |
370 | } | |
091a364c TG |
371 | |
372 | return 0; | |
373 | } | |
374 | ||
74b2466e | 375 | int manager_parse_config_file(Manager *m) { |
091a364c TG |
376 | int r; |
377 | ||
378 | assert(m); | |
379 | ||
e9f3d2d5 | 380 | r = config_parse(NULL, "/etc/systemd/resolved.conf", NULL, |
74b2466e | 381 | "Resolve\0", |
e9f3d2d5 | 382 | config_item_perf_lookup, resolved_gperf_lookup, |
987d561f | 383 | false, false, m); |
091a364c TG |
384 | if (r < 0) |
385 | log_warning("Failed to parse configuration file: %s", strerror(-r)); | |
386 | ||
74b2466e | 387 | return 0; |
091a364c TG |
388 | } |
389 | ||
390 | int manager_new(Manager **ret) { | |
74b2466e | 391 | _cleanup_(manager_freep) Manager *m = NULL; |
091a364c TG |
392 | int r; |
393 | ||
c92e531c LP |
394 | assert(ret); |
395 | ||
091a364c TG |
396 | m = new0(Manager, 1); |
397 | if (!m) | |
398 | return -ENOMEM; | |
399 | ||
74b2466e | 400 | m->dns_ipv4_fd = m->dns_ipv6_fd = -1; |
091a364c | 401 | |
74b2466e | 402 | r = parse_dns_server_string(m, /* "172.31.0.125 2001:4860:4860::8888 2001:4860:4860::8889" */ DNS_SERVERS); |
091a364c TG |
403 | if (r < 0) |
404 | return r; | |
405 | ||
406 | r = sd_event_default(&m->event); | |
407 | if (r < 0) | |
408 | return r; | |
409 | ||
410 | sd_event_add_signal(m->event, NULL, SIGTERM, NULL, NULL); | |
411 | sd_event_add_signal(m->event, NULL, SIGINT, NULL, NULL); | |
412 | ||
413 | sd_event_set_watchdog(m->event, true); | |
414 | ||
74b2466e LP |
415 | r = dns_scope_new(m, &m->unicast_scope, DNS_SCOPE_DNS); |
416 | if (r < 0) | |
417 | return r; | |
418 | ||
419 | r = manager_network_monitor_listen(m); | |
420 | if (r < 0) | |
421 | return r; | |
422 | ||
423 | r = manager_rtnl_listen(m); | |
424 | if (r < 0) | |
425 | return r; | |
426 | ||
427 | r = manager_connect_bus(m); | |
428 | if (r < 0) | |
429 | return r; | |
430 | ||
091a364c TG |
431 | *ret = m; |
432 | m = NULL; | |
433 | ||
434 | return 0; | |
435 | } | |
436 | ||
74b2466e LP |
437 | Manager *manager_free(Manager *m) { |
438 | Link *l; | |
091a364c TG |
439 | |
440 | if (!m) | |
74b2466e LP |
441 | return NULL; |
442 | ||
443 | while (m->dns_queries) | |
444 | dns_query_free(m->dns_queries); | |
445 | ||
446 | hashmap_free(m->dns_query_transactions); | |
447 | ||
448 | while ((l = hashmap_first(m->links))) | |
449 | link_free(l); | |
450 | hashmap_free(m->links); | |
451 | ||
452 | dns_scope_free(m->unicast_scope); | |
453 | ||
454 | while (m->dns_servers) | |
455 | dns_server_free(m->dns_servers); | |
091a364c | 456 | |
096b6773 LP |
457 | sd_event_source_unref(m->network_event_source); |
458 | sd_network_monitor_unref(m->network_monitor); | |
091a364c | 459 | |
74b2466e LP |
460 | sd_event_source_unref(m->dns_ipv4_event_source); |
461 | sd_event_source_unref(m->dns_ipv6_event_source); | |
462 | ||
463 | safe_close(m->dns_ipv4_fd); | |
464 | safe_close(m->dns_ipv6_fd); | |
465 | ||
466 | sd_event_source_unref(m->bus_retry_event_source); | |
467 | sd_bus_unref(m->bus); | |
091a364c | 468 | |
74b2466e | 469 | sd_event_unref(m->event); |
091a364c | 470 | free(m); |
74b2466e LP |
471 | |
472 | return NULL; | |
091a364c TG |
473 | } |
474 | ||
74b2466e LP |
475 | static void write_resolve_conf_server(DnsServer *s, FILE *f, unsigned *count) { |
476 | _cleanup_free_ char *t = NULL; | |
477 | int r; | |
091a364c | 478 | |
74b2466e | 479 | assert(s); |
091a364c | 480 | assert(f); |
091a364c TG |
481 | assert(count); |
482 | ||
74b2466e LP |
483 | r = in_addr_to_string(s->family, &s->address, &t); |
484 | if (r < 0) { | |
091a364c TG |
485 | log_warning("Invalid DNS address. Ignoring."); |
486 | return; | |
487 | } | |
488 | ||
489 | if (*count == MAXNS) | |
74b2466e | 490 | fputs("# Too many DNS servers configured, the following entries may be ignored\n", f); |
091a364c | 491 | |
74b2466e | 492 | fprintf(f, "nameserver %s\n", t); |
091a364c TG |
493 | (*count) ++; |
494 | } | |
495 | ||
74b2466e | 496 | int manager_write_resolv_conf(Manager *m) { |
b686acb2 | 497 | const char *path = "/run/systemd/resolve/resolv.conf"; |
091a364c TG |
498 | _cleanup_free_ char *temp_path = NULL; |
499 | _cleanup_fclose_ FILE *f = NULL; | |
091a364c | 500 | unsigned count = 0; |
74b2466e LP |
501 | DnsServer *s; |
502 | Iterator i; | |
503 | Link *l; | |
504 | int r; | |
091a364c TG |
505 | |
506 | assert(m); | |
507 | ||
b686acb2 | 508 | r = fopen_temporary(path, &f, &temp_path); |
091a364c TG |
509 | if (r < 0) |
510 | return r; | |
511 | ||
512 | fchmod(fileno(f), 0644); | |
513 | ||
514 | fputs("# This file is managed by systemd-resolved(8). Do not edit.\n#\n" | |
515 | "# Third party programs must not access this file directly, but\n" | |
516 | "# only through the symlink at /etc/resolv.conf. To manage\n" | |
517 | "# resolv.conf(5) in a different way, replace the symlink by a\n" | |
518 | "# static file or a different symlink.\n\n", f); | |
519 | ||
74b2466e LP |
520 | HASHMAP_FOREACH(l, m->links, i) { |
521 | LIST_FOREACH(servers, s, l->link_dns_servers) | |
522 | write_resolve_conf_server(s, f, &count); | |
091a364c | 523 | |
74b2466e LP |
524 | LIST_FOREACH(servers, s, l->dhcp_dns_servers) |
525 | write_resolve_conf_server(s, f, &count); | |
526 | } | |
091a364c | 527 | |
74b2466e LP |
528 | LIST_FOREACH(servers, s, m->dns_servers) |
529 | write_resolve_conf_server(s, f, &count); | |
091a364c | 530 | |
74b2466e LP |
531 | r = fflush_and_check(f); |
532 | if (r < 0) | |
533 | goto fail; | |
534 | ||
535 | if (rename(temp_path, path) < 0) { | |
536 | r = -errno; | |
537 | goto fail; | |
538 | } | |
091a364c | 539 | |
74b2466e | 540 | return 0; |
091a364c | 541 | |
74b2466e LP |
542 | fail: |
543 | unlink(path); | |
544 | unlink(temp_path); | |
545 | return r; | |
546 | } | |
091a364c | 547 | |
74b2466e LP |
548 | int manager_dns_ipv4_recv(Manager *m, DnsPacket **ret) { |
549 | _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL; | |
550 | struct msghdr mh = {}; | |
551 | int fd, ms = 0, r; | |
552 | struct iovec iov; | |
553 | ssize_t l; | |
554 | ||
555 | assert(m); | |
556 | assert(ret); | |
557 | ||
558 | fd = manager_dns_ipv4_fd(m); | |
559 | if (fd < 0) | |
560 | return fd; | |
561 | ||
562 | r = ioctl(fd, FIONREAD, &ms); | |
563 | if (r < 0) | |
564 | return -errno; | |
565 | if (ms < 0) | |
566 | return -EIO; | |
567 | ||
568 | r = dns_packet_new(&p, ms); | |
569 | if (r < 0) | |
570 | return r; | |
571 | ||
572 | iov.iov_base = DNS_PACKET_DATA(p); | |
573 | iov.iov_len = p->allocated; | |
574 | ||
575 | mh.msg_iov = &iov; | |
576 | mh.msg_iovlen = 1; | |
577 | ||
578 | l = recvmsg(fd, &mh, 0); | |
579 | if (l < 0) { | |
580 | if (errno == EAGAIN) | |
581 | return 0; | |
582 | ||
583 | return -errno; | |
091a364c TG |
584 | } |
585 | ||
74b2466e LP |
586 | if (l <= 0) |
587 | return -EIO; | |
091a364c | 588 | |
74b2466e | 589 | p->size = (size_t) l; |
091a364c | 590 | |
74b2466e LP |
591 | *ret = p; |
592 | p = NULL; | |
593 | ||
594 | return 1; | |
595 | } | |
596 | ||
597 | int manager_dns_ipv6_recv(Manager *m, DnsPacket **ret) { | |
598 | _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL; | |
599 | struct msghdr mh = {}; | |
600 | struct iovec iov; | |
601 | int fd, ms = 0, r; | |
602 | ssize_t l; | |
603 | ||
604 | assert(m); | |
605 | assert(ret); | |
606 | ||
607 | fd = manager_dns_ipv6_fd(m); | |
608 | if (fd < 0) | |
609 | return fd; | |
610 | ||
611 | r = ioctl(fd, FIONREAD, &ms); | |
612 | if (r < 0) | |
613 | return -errno; | |
614 | if (ms < 0) | |
615 | return -EIO; | |
616 | ||
617 | r = dns_packet_new(&p, ms); | |
618 | if (r < 0) | |
091a364c | 619 | return r; |
74b2466e LP |
620 | |
621 | iov.iov_base = DNS_PACKET_DATA(p); | |
622 | iov.iov_len = p->allocated; | |
623 | ||
624 | mh.msg_iov = &iov; | |
625 | mh.msg_iovlen = 1; | |
626 | ||
627 | l = recvmsg(fd, &mh, 0); | |
628 | if (l < 0) { | |
629 | if (errno == EAGAIN) | |
630 | return 0; | |
631 | ||
632 | return -errno; | |
091a364c TG |
633 | } |
634 | ||
74b2466e LP |
635 | if (l <= 0) |
636 | return -EIO; | |
637 | ||
638 | p->size = (size_t) l; | |
639 | ||
640 | *ret = p; | |
641 | p = NULL; | |
642 | ||
643 | return 1; | |
644 | } | |
645 | ||
646 | static int on_dns_ipv4_packet(sd_event_source *s, int fd, uint32_t revents, void *userdata) { | |
647 | _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL; | |
648 | DnsQueryTransaction *t = NULL; | |
649 | Manager *m = userdata; | |
650 | int r; | |
651 | ||
652 | r = manager_dns_ipv4_recv(m, &p); | |
653 | if (r <= 0) | |
654 | return r; | |
655 | ||
656 | t = hashmap_get(m->dns_query_transactions, UINT_TO_PTR(DNS_PACKET_HEADER(p)->id)); | |
657 | if (!t) | |
658 | return 0; | |
659 | ||
660 | return dns_query_transaction_reply(t, p); | |
091a364c TG |
661 | } |
662 | ||
74b2466e LP |
663 | static int on_dns_ipv6_packet(sd_event_source *s, int fd, uint32_t revents, void *userdata) { |
664 | _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL; | |
665 | DnsQueryTransaction *t = NULL; | |
091a364c TG |
666 | Manager *m = userdata; |
667 | int r; | |
668 | ||
74b2466e LP |
669 | r = manager_dns_ipv6_recv(m, &p); |
670 | if (r <= 0) | |
671 | return r; | |
672 | ||
673 | t = hashmap_get(m->dns_query_transactions, UINT_TO_PTR(DNS_PACKET_HEADER(p)->id)); | |
674 | if (!t) | |
675 | return 0; | |
676 | ||
677 | return dns_query_transaction_reply(t, p); | |
678 | } | |
679 | ||
680 | int manager_dns_ipv4_fd(Manager *m) { | |
681 | int r; | |
682 | ||
091a364c TG |
683 | assert(m); |
684 | ||
74b2466e LP |
685 | if (m->dns_ipv4_fd >= 0) |
686 | return m->dns_ipv4_fd; | |
091a364c | 687 | |
74b2466e LP |
688 | m->dns_ipv4_fd = socket(AF_INET, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); |
689 | if (m->dns_ipv4_fd < 0) | |
690 | return -errno; | |
091a364c | 691 | |
74b2466e LP |
692 | r = sd_event_add_io(m->event, &m->dns_ipv4_event_source, m->dns_ipv4_fd, EPOLLIN, on_dns_ipv4_packet, m); |
693 | if (r < 0) | |
694 | return r; | |
695 | ||
696 | return m->dns_ipv4_fd; | |
091a364c TG |
697 | } |
698 | ||
74b2466e LP |
699 | int manager_dns_ipv6_fd(Manager *m) { |
700 | int r; | |
701 | ||
702 | assert(m); | |
091a364c | 703 | |
74b2466e LP |
704 | if (m->dns_ipv6_fd >= 0) |
705 | return m->dns_ipv6_fd; | |
706 | ||
707 | m->dns_ipv6_fd = socket(AF_INET6, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); | |
708 | if (m->dns_ipv6_fd < 0) | |
709 | return -errno; | |
710 | ||
711 | r = sd_event_add_io(m->event, &m->dns_ipv6_event_source, m->dns_ipv6_fd, EPOLLIN, on_dns_ipv6_packet, m); | |
091a364c TG |
712 | if (r < 0) |
713 | return r; | |
714 | ||
74b2466e LP |
715 | return m->dns_ipv6_fd; |
716 | } | |
717 | ||
718 | static int sendmsg_loop(int fd, struct msghdr *mh, int flags) { | |
719 | int r; | |
720 | ||
721 | assert(fd >= 0); | |
722 | assert(mh); | |
723 | ||
724 | for (;;) { | |
725 | if (sendmsg(fd, mh, flags) >= 0) | |
726 | return 0; | |
727 | ||
728 | if (errno == EINTR) | |
729 | continue; | |
730 | ||
731 | if (errno != EAGAIN) | |
732 | return -errno; | |
733 | ||
734 | r = fd_wait_for_event(fd, POLLOUT, SEND_TIMEOUT_USEC); | |
735 | if (r < 0) | |
736 | return r; | |
737 | if (r == 0) | |
738 | return -ETIMEDOUT; | |
739 | } | |
740 | } | |
741 | ||
742 | int manager_dns_ipv4_send(Manager *m, DnsServer *srv, int ifindex, DnsPacket *p) { | |
743 | union sockaddr_union sa = { | |
744 | .in.sin_family = AF_INET, | |
745 | .in.sin_port = htobe16(53), | |
746 | }; | |
747 | struct msghdr mh = {}; | |
748 | struct iovec iov; | |
749 | uint8_t control[CMSG_SPACE(sizeof(struct in_pktinfo))]; | |
750 | int fd; | |
751 | ||
752 | assert(m); | |
753 | assert(srv); | |
754 | assert(p); | |
755 | ||
756 | fd = manager_dns_ipv4_fd(m); | |
091a364c TG |
757 | if (fd < 0) |
758 | return fd; | |
759 | ||
74b2466e LP |
760 | iov.iov_base = DNS_PACKET_DATA(p); |
761 | iov.iov_len = p->size; | |
091a364c | 762 | |
74b2466e | 763 | sa.in.sin_addr = srv->address.in; |
091a364c | 764 | |
74b2466e LP |
765 | mh.msg_iov = &iov; |
766 | mh.msg_iovlen = 1; | |
767 | mh.msg_name = &sa.sa; | |
768 | mh.msg_namelen = sizeof(sa.in); | |
091a364c | 769 | |
74b2466e LP |
770 | if (ifindex > 0) { |
771 | struct cmsghdr *cmsg; | |
772 | struct in_pktinfo *pi; | |
773 | ||
774 | zero(control); | |
775 | ||
776 | mh.msg_control = control; | |
777 | mh.msg_controllen = CMSG_LEN(sizeof(struct in_pktinfo)); | |
778 | ||
779 | cmsg = CMSG_FIRSTHDR(&mh); | |
780 | cmsg->cmsg_len = mh.msg_controllen; | |
781 | cmsg->cmsg_level = IPPROTO_IP; | |
782 | cmsg->cmsg_type = IP_PKTINFO; | |
783 | ||
784 | pi = (struct in_pktinfo*) CMSG_DATA(cmsg); | |
785 | pi->ipi_ifindex = ifindex; | |
786 | } | |
787 | ||
788 | return sendmsg_loop(fd, &mh, 0); | |
789 | } | |
790 | ||
791 | int manager_dns_ipv6_send(Manager *m, DnsServer *srv, int ifindex, DnsPacket *p) { | |
792 | union sockaddr_union sa = { | |
793 | .in6.sin6_family = AF_INET6, | |
794 | .in6.sin6_port = htobe16(53), | |
795 | }; | |
796 | ||
797 | struct msghdr mh = {}; | |
798 | struct iovec iov; | |
799 | uint8_t control[CMSG_SPACE(sizeof(struct in6_pktinfo))]; | |
800 | int fd; | |
801 | ||
802 | assert(m); | |
803 | assert(srv); | |
804 | assert(p); | |
805 | ||
806 | fd = manager_dns_ipv6_fd(m); | |
807 | if (fd < 0) | |
808 | return fd; | |
809 | ||
810 | iov.iov_base = DNS_PACKET_DATA(p); | |
811 | iov.iov_len = p->size; | |
812 | ||
813 | sa.in6.sin6_addr = srv->address.in6; | |
814 | sa.in6.sin6_scope_id = ifindex; | |
815 | ||
816 | mh.msg_iov = &iov; | |
817 | mh.msg_iovlen = 1; | |
818 | mh.msg_name = &sa.sa; | |
819 | mh.msg_namelen = sizeof(sa.in6); | |
820 | ||
821 | if (ifindex > 0) { | |
822 | struct cmsghdr *cmsg; | |
823 | struct in6_pktinfo *pi; | |
824 | ||
825 | zero(control); | |
826 | ||
827 | mh.msg_control = control; | |
828 | mh.msg_controllen = CMSG_LEN(sizeof(struct in6_pktinfo)); | |
829 | ||
830 | cmsg = CMSG_FIRSTHDR(&mh); | |
831 | cmsg->cmsg_len = mh.msg_controllen; | |
832 | cmsg->cmsg_level = IPPROTO_IPV6; | |
833 | cmsg->cmsg_type = IPV6_PKTINFO; | |
834 | ||
835 | pi = (struct in6_pktinfo*) CMSG_DATA(cmsg); | |
836 | pi->ipi6_ifindex = ifindex; | |
837 | } | |
838 | ||
839 | return sendmsg_loop(fd, &mh, 0); | |
840 | } | |
841 | ||
842 | DnsServer* manager_find_dns_server(Manager *m, unsigned char family, union in_addr_union *in_addr) { | |
843 | DnsServer *s; | |
844 | ||
845 | assert(m); | |
846 | assert(in_addr); | |
847 | ||
848 | LIST_FOREACH(servers, s, m->dns_servers) { | |
849 | ||
850 | if (s->family == family && | |
851 | in_addr_equal(family, &s->address, in_addr)) | |
852 | return s; | |
853 | } | |
854 | ||
855 | return NULL; | |
856 | } | |
857 | ||
858 | DnsServer *manager_get_dns_server(Manager *m) { | |
859 | assert(m); | |
860 | ||
861 | if (!m->current_dns_server) | |
862 | m->current_dns_server = m->dns_servers; | |
863 | ||
864 | return m->current_dns_server; | |
865 | } | |
866 | ||
867 | void manager_next_dns_server(Manager *m) { | |
868 | assert(m); | |
869 | ||
870 | if (!m->current_dns_server) { | |
871 | m->current_dns_server = m->dns_servers; | |
872 | return; | |
873 | } | |
874 | ||
875 | if (!m->current_dns_server) | |
876 | return; | |
877 | ||
878 | if (m->current_dns_server->servers_next) { | |
879 | m->current_dns_server = m->current_dns_server->servers_next; | |
880 | return; | |
881 | } | |
882 | ||
883 | m->current_dns_server = m->dns_servers; | |
091a364c | 884 | } |