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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 | ||
0014a4ad | 285 | r = sd_network_monitor_new(&m->network_monitor, NULL); |
74b2466e LP |
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 | assert(m); |
377 | ||
36f822c4 ZJS |
378 | return config_parse(NULL, "/etc/systemd/resolved.conf", NULL, |
379 | "Resolve\0", | |
380 | config_item_perf_lookup, resolved_gperf_lookup, | |
381 | false, false, true, m); | |
091a364c TG |
382 | } |
383 | ||
384 | int manager_new(Manager **ret) { | |
74b2466e | 385 | _cleanup_(manager_freep) Manager *m = NULL; |
091a364c TG |
386 | int r; |
387 | ||
c92e531c LP |
388 | assert(ret); |
389 | ||
091a364c TG |
390 | m = new0(Manager, 1); |
391 | if (!m) | |
392 | return -ENOMEM; | |
393 | ||
74b2466e | 394 | m->dns_ipv4_fd = m->dns_ipv6_fd = -1; |
091a364c | 395 | |
74b2466e | 396 | r = parse_dns_server_string(m, /* "172.31.0.125 2001:4860:4860::8888 2001:4860:4860::8889" */ DNS_SERVERS); |
091a364c TG |
397 | if (r < 0) |
398 | return r; | |
399 | ||
400 | r = sd_event_default(&m->event); | |
401 | if (r < 0) | |
402 | return r; | |
403 | ||
404 | sd_event_add_signal(m->event, NULL, SIGTERM, NULL, NULL); | |
405 | sd_event_add_signal(m->event, NULL, SIGINT, NULL, NULL); | |
406 | ||
407 | sd_event_set_watchdog(m->event, true); | |
408 | ||
74b2466e LP |
409 | r = dns_scope_new(m, &m->unicast_scope, DNS_SCOPE_DNS); |
410 | if (r < 0) | |
411 | return r; | |
412 | ||
413 | r = manager_network_monitor_listen(m); | |
414 | if (r < 0) | |
415 | return r; | |
416 | ||
417 | r = manager_rtnl_listen(m); | |
418 | if (r < 0) | |
419 | return r; | |
420 | ||
421 | r = manager_connect_bus(m); | |
422 | if (r < 0) | |
423 | return r; | |
424 | ||
091a364c TG |
425 | *ret = m; |
426 | m = NULL; | |
427 | ||
428 | return 0; | |
429 | } | |
430 | ||
74b2466e LP |
431 | Manager *manager_free(Manager *m) { |
432 | Link *l; | |
091a364c TG |
433 | |
434 | if (!m) | |
74b2466e LP |
435 | return NULL; |
436 | ||
437 | while (m->dns_queries) | |
438 | dns_query_free(m->dns_queries); | |
439 | ||
440 | hashmap_free(m->dns_query_transactions); | |
441 | ||
442 | while ((l = hashmap_first(m->links))) | |
443 | link_free(l); | |
444 | hashmap_free(m->links); | |
445 | ||
446 | dns_scope_free(m->unicast_scope); | |
447 | ||
448 | while (m->dns_servers) | |
449 | dns_server_free(m->dns_servers); | |
091a364c | 450 | |
096b6773 LP |
451 | sd_event_source_unref(m->network_event_source); |
452 | sd_network_monitor_unref(m->network_monitor); | |
091a364c | 453 | |
74b2466e LP |
454 | sd_event_source_unref(m->dns_ipv4_event_source); |
455 | sd_event_source_unref(m->dns_ipv6_event_source); | |
456 | ||
457 | safe_close(m->dns_ipv4_fd); | |
458 | safe_close(m->dns_ipv6_fd); | |
459 | ||
460 | sd_event_source_unref(m->bus_retry_event_source); | |
461 | sd_bus_unref(m->bus); | |
091a364c | 462 | |
74b2466e | 463 | sd_event_unref(m->event); |
091a364c | 464 | free(m); |
74b2466e LP |
465 | |
466 | return NULL; | |
091a364c TG |
467 | } |
468 | ||
74b2466e LP |
469 | static void write_resolve_conf_server(DnsServer *s, FILE *f, unsigned *count) { |
470 | _cleanup_free_ char *t = NULL; | |
471 | int r; | |
091a364c | 472 | |
74b2466e | 473 | assert(s); |
091a364c | 474 | assert(f); |
091a364c TG |
475 | assert(count); |
476 | ||
74b2466e LP |
477 | r = in_addr_to_string(s->family, &s->address, &t); |
478 | if (r < 0) { | |
091a364c TG |
479 | log_warning("Invalid DNS address. Ignoring."); |
480 | return; | |
481 | } | |
482 | ||
483 | if (*count == MAXNS) | |
74b2466e | 484 | fputs("# Too many DNS servers configured, the following entries may be ignored\n", f); |
091a364c | 485 | |
74b2466e | 486 | fprintf(f, "nameserver %s\n", t); |
091a364c TG |
487 | (*count) ++; |
488 | } | |
489 | ||
74b2466e | 490 | int manager_write_resolv_conf(Manager *m) { |
b686acb2 | 491 | const char *path = "/run/systemd/resolve/resolv.conf"; |
091a364c TG |
492 | _cleanup_free_ char *temp_path = NULL; |
493 | _cleanup_fclose_ FILE *f = NULL; | |
091a364c | 494 | unsigned count = 0; |
74b2466e LP |
495 | DnsServer *s; |
496 | Iterator i; | |
497 | Link *l; | |
498 | int r; | |
091a364c TG |
499 | |
500 | assert(m); | |
501 | ||
b686acb2 | 502 | r = fopen_temporary(path, &f, &temp_path); |
091a364c TG |
503 | if (r < 0) |
504 | return r; | |
505 | ||
506 | fchmod(fileno(f), 0644); | |
507 | ||
508 | fputs("# This file is managed by systemd-resolved(8). Do not edit.\n#\n" | |
509 | "# Third party programs must not access this file directly, but\n" | |
510 | "# only through the symlink at /etc/resolv.conf. To manage\n" | |
511 | "# resolv.conf(5) in a different way, replace the symlink by a\n" | |
512 | "# static file or a different symlink.\n\n", f); | |
513 | ||
74b2466e LP |
514 | HASHMAP_FOREACH(l, m->links, i) { |
515 | LIST_FOREACH(servers, s, l->link_dns_servers) | |
516 | write_resolve_conf_server(s, f, &count); | |
091a364c | 517 | |
74b2466e LP |
518 | LIST_FOREACH(servers, s, l->dhcp_dns_servers) |
519 | write_resolve_conf_server(s, f, &count); | |
520 | } | |
091a364c | 521 | |
74b2466e LP |
522 | LIST_FOREACH(servers, s, m->dns_servers) |
523 | write_resolve_conf_server(s, f, &count); | |
091a364c | 524 | |
74b2466e LP |
525 | r = fflush_and_check(f); |
526 | if (r < 0) | |
527 | goto fail; | |
528 | ||
529 | if (rename(temp_path, path) < 0) { | |
530 | r = -errno; | |
531 | goto fail; | |
532 | } | |
091a364c | 533 | |
74b2466e | 534 | return 0; |
091a364c | 535 | |
74b2466e LP |
536 | fail: |
537 | unlink(path); | |
538 | unlink(temp_path); | |
539 | return r; | |
540 | } | |
091a364c | 541 | |
74b2466e LP |
542 | int manager_dns_ipv4_recv(Manager *m, DnsPacket **ret) { |
543 | _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL; | |
544 | struct msghdr mh = {}; | |
545 | int fd, ms = 0, r; | |
546 | struct iovec iov; | |
547 | ssize_t l; | |
548 | ||
549 | assert(m); | |
550 | assert(ret); | |
551 | ||
552 | fd = manager_dns_ipv4_fd(m); | |
553 | if (fd < 0) | |
554 | return fd; | |
555 | ||
556 | r = ioctl(fd, FIONREAD, &ms); | |
557 | if (r < 0) | |
558 | return -errno; | |
559 | if (ms < 0) | |
560 | return -EIO; | |
561 | ||
562 | r = dns_packet_new(&p, ms); | |
563 | if (r < 0) | |
564 | return r; | |
565 | ||
566 | iov.iov_base = DNS_PACKET_DATA(p); | |
567 | iov.iov_len = p->allocated; | |
568 | ||
569 | mh.msg_iov = &iov; | |
570 | mh.msg_iovlen = 1; | |
571 | ||
572 | l = recvmsg(fd, &mh, 0); | |
573 | if (l < 0) { | |
ad867662 | 574 | if (errno == EAGAIN || errno == EINTR) |
74b2466e LP |
575 | return 0; |
576 | ||
577 | return -errno; | |
091a364c TG |
578 | } |
579 | ||
74b2466e LP |
580 | if (l <= 0) |
581 | return -EIO; | |
091a364c | 582 | |
74b2466e | 583 | p->size = (size_t) l; |
091a364c | 584 | |
74b2466e LP |
585 | *ret = p; |
586 | p = NULL; | |
587 | ||
588 | return 1; | |
589 | } | |
590 | ||
591 | int manager_dns_ipv6_recv(Manager *m, DnsPacket **ret) { | |
592 | _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL; | |
593 | struct msghdr mh = {}; | |
594 | struct iovec iov; | |
595 | int fd, ms = 0, r; | |
596 | ssize_t l; | |
597 | ||
598 | assert(m); | |
599 | assert(ret); | |
600 | ||
601 | fd = manager_dns_ipv6_fd(m); | |
602 | if (fd < 0) | |
603 | return fd; | |
604 | ||
605 | r = ioctl(fd, FIONREAD, &ms); | |
606 | if (r < 0) | |
607 | return -errno; | |
608 | if (ms < 0) | |
609 | return -EIO; | |
610 | ||
611 | r = dns_packet_new(&p, ms); | |
612 | if (r < 0) | |
091a364c | 613 | return r; |
74b2466e LP |
614 | |
615 | iov.iov_base = DNS_PACKET_DATA(p); | |
616 | iov.iov_len = p->allocated; | |
617 | ||
618 | mh.msg_iov = &iov; | |
619 | mh.msg_iovlen = 1; | |
620 | ||
621 | l = recvmsg(fd, &mh, 0); | |
622 | if (l < 0) { | |
ad867662 | 623 | if (errno == EAGAIN || errno == EINTR) |
74b2466e LP |
624 | return 0; |
625 | ||
626 | return -errno; | |
091a364c TG |
627 | } |
628 | ||
74b2466e LP |
629 | if (l <= 0) |
630 | return -EIO; | |
631 | ||
632 | p->size = (size_t) l; | |
633 | ||
634 | *ret = p; | |
635 | p = NULL; | |
636 | ||
637 | return 1; | |
638 | } | |
639 | ||
640 | static int on_dns_ipv4_packet(sd_event_source *s, int fd, uint32_t revents, void *userdata) { | |
641 | _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL; | |
642 | DnsQueryTransaction *t = NULL; | |
643 | Manager *m = userdata; | |
644 | int r; | |
645 | ||
646 | r = manager_dns_ipv4_recv(m, &p); | |
647 | if (r <= 0) | |
648 | return r; | |
649 | ||
3cb10d3a | 650 | t = hashmap_get(m->dns_query_transactions, UINT_TO_PTR(DNS_PACKET_ID(p))); |
74b2466e LP |
651 | if (!t) |
652 | return 0; | |
653 | ||
ad867662 LP |
654 | dns_query_transaction_reply(t, p); |
655 | return 0; | |
091a364c TG |
656 | } |
657 | ||
74b2466e LP |
658 | static int on_dns_ipv6_packet(sd_event_source *s, int fd, uint32_t revents, void *userdata) { |
659 | _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL; | |
660 | DnsQueryTransaction *t = NULL; | |
091a364c TG |
661 | Manager *m = userdata; |
662 | int r; | |
663 | ||
74b2466e LP |
664 | r = manager_dns_ipv6_recv(m, &p); |
665 | if (r <= 0) | |
666 | return r; | |
667 | ||
3cb10d3a | 668 | t = hashmap_get(m->dns_query_transactions, UINT_TO_PTR(DNS_PACKET_ID(p))); |
74b2466e LP |
669 | if (!t) |
670 | return 0; | |
671 | ||
ad867662 LP |
672 | dns_query_transaction_reply(t, p); |
673 | return 0; | |
74b2466e LP |
674 | } |
675 | ||
676 | int manager_dns_ipv4_fd(Manager *m) { | |
677 | int r; | |
678 | ||
091a364c TG |
679 | assert(m); |
680 | ||
74b2466e LP |
681 | if (m->dns_ipv4_fd >= 0) |
682 | return m->dns_ipv4_fd; | |
091a364c | 683 | |
74b2466e LP |
684 | m->dns_ipv4_fd = socket(AF_INET, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); |
685 | if (m->dns_ipv4_fd < 0) | |
686 | return -errno; | |
091a364c | 687 | |
74b2466e LP |
688 | r = sd_event_add_io(m->event, &m->dns_ipv4_event_source, m->dns_ipv4_fd, EPOLLIN, on_dns_ipv4_packet, m); |
689 | if (r < 0) | |
690 | return r; | |
691 | ||
692 | return m->dns_ipv4_fd; | |
091a364c TG |
693 | } |
694 | ||
74b2466e LP |
695 | int manager_dns_ipv6_fd(Manager *m) { |
696 | int r; | |
697 | ||
698 | assert(m); | |
091a364c | 699 | |
74b2466e LP |
700 | if (m->dns_ipv6_fd >= 0) |
701 | return m->dns_ipv6_fd; | |
702 | ||
703 | m->dns_ipv6_fd = socket(AF_INET6, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); | |
704 | if (m->dns_ipv6_fd < 0) | |
705 | return -errno; | |
706 | ||
707 | r = sd_event_add_io(m->event, &m->dns_ipv6_event_source, m->dns_ipv6_fd, EPOLLIN, on_dns_ipv6_packet, m); | |
091a364c TG |
708 | if (r < 0) |
709 | return r; | |
710 | ||
74b2466e LP |
711 | return m->dns_ipv6_fd; |
712 | } | |
713 | ||
714 | static int sendmsg_loop(int fd, struct msghdr *mh, int flags) { | |
715 | int r; | |
716 | ||
717 | assert(fd >= 0); | |
718 | assert(mh); | |
719 | ||
720 | for (;;) { | |
721 | if (sendmsg(fd, mh, flags) >= 0) | |
722 | return 0; | |
723 | ||
724 | if (errno == EINTR) | |
725 | continue; | |
726 | ||
727 | if (errno != EAGAIN) | |
728 | return -errno; | |
729 | ||
730 | r = fd_wait_for_event(fd, POLLOUT, SEND_TIMEOUT_USEC); | |
731 | if (r < 0) | |
732 | return r; | |
733 | if (r == 0) | |
734 | return -ETIMEDOUT; | |
735 | } | |
736 | } | |
737 | ||
738 | int manager_dns_ipv4_send(Manager *m, DnsServer *srv, int ifindex, DnsPacket *p) { | |
739 | union sockaddr_union sa = { | |
740 | .in.sin_family = AF_INET, | |
741 | .in.sin_port = htobe16(53), | |
742 | }; | |
743 | struct msghdr mh = {}; | |
744 | struct iovec iov; | |
745 | uint8_t control[CMSG_SPACE(sizeof(struct in_pktinfo))]; | |
746 | int fd; | |
747 | ||
748 | assert(m); | |
749 | assert(srv); | |
750 | assert(p); | |
751 | ||
752 | fd = manager_dns_ipv4_fd(m); | |
091a364c TG |
753 | if (fd < 0) |
754 | return fd; | |
755 | ||
74b2466e LP |
756 | iov.iov_base = DNS_PACKET_DATA(p); |
757 | iov.iov_len = p->size; | |
091a364c | 758 | |
74b2466e | 759 | sa.in.sin_addr = srv->address.in; |
091a364c | 760 | |
74b2466e LP |
761 | mh.msg_iov = &iov; |
762 | mh.msg_iovlen = 1; | |
763 | mh.msg_name = &sa.sa; | |
764 | mh.msg_namelen = sizeof(sa.in); | |
091a364c | 765 | |
74b2466e LP |
766 | if (ifindex > 0) { |
767 | struct cmsghdr *cmsg; | |
768 | struct in_pktinfo *pi; | |
769 | ||
770 | zero(control); | |
771 | ||
772 | mh.msg_control = control; | |
773 | mh.msg_controllen = CMSG_LEN(sizeof(struct in_pktinfo)); | |
774 | ||
775 | cmsg = CMSG_FIRSTHDR(&mh); | |
776 | cmsg->cmsg_len = mh.msg_controllen; | |
777 | cmsg->cmsg_level = IPPROTO_IP; | |
778 | cmsg->cmsg_type = IP_PKTINFO; | |
779 | ||
780 | pi = (struct in_pktinfo*) CMSG_DATA(cmsg); | |
781 | pi->ipi_ifindex = ifindex; | |
782 | } | |
783 | ||
784 | return sendmsg_loop(fd, &mh, 0); | |
785 | } | |
786 | ||
787 | int manager_dns_ipv6_send(Manager *m, DnsServer *srv, int ifindex, DnsPacket *p) { | |
788 | union sockaddr_union sa = { | |
789 | .in6.sin6_family = AF_INET6, | |
790 | .in6.sin6_port = htobe16(53), | |
791 | }; | |
792 | ||
793 | struct msghdr mh = {}; | |
794 | struct iovec iov; | |
795 | uint8_t control[CMSG_SPACE(sizeof(struct in6_pktinfo))]; | |
796 | int fd; | |
797 | ||
798 | assert(m); | |
799 | assert(srv); | |
800 | assert(p); | |
801 | ||
802 | fd = manager_dns_ipv6_fd(m); | |
803 | if (fd < 0) | |
804 | return fd; | |
805 | ||
806 | iov.iov_base = DNS_PACKET_DATA(p); | |
807 | iov.iov_len = p->size; | |
808 | ||
809 | sa.in6.sin6_addr = srv->address.in6; | |
810 | sa.in6.sin6_scope_id = ifindex; | |
811 | ||
812 | mh.msg_iov = &iov; | |
813 | mh.msg_iovlen = 1; | |
814 | mh.msg_name = &sa.sa; | |
815 | mh.msg_namelen = sizeof(sa.in6); | |
816 | ||
817 | if (ifindex > 0) { | |
818 | struct cmsghdr *cmsg; | |
819 | struct in6_pktinfo *pi; | |
820 | ||
821 | zero(control); | |
822 | ||
823 | mh.msg_control = control; | |
824 | mh.msg_controllen = CMSG_LEN(sizeof(struct in6_pktinfo)); | |
825 | ||
826 | cmsg = CMSG_FIRSTHDR(&mh); | |
827 | cmsg->cmsg_len = mh.msg_controllen; | |
828 | cmsg->cmsg_level = IPPROTO_IPV6; | |
829 | cmsg->cmsg_type = IPV6_PKTINFO; | |
830 | ||
831 | pi = (struct in6_pktinfo*) CMSG_DATA(cmsg); | |
832 | pi->ipi6_ifindex = ifindex; | |
833 | } | |
834 | ||
835 | return sendmsg_loop(fd, &mh, 0); | |
836 | } | |
837 | ||
838 | DnsServer* manager_find_dns_server(Manager *m, unsigned char family, union in_addr_union *in_addr) { | |
839 | DnsServer *s; | |
840 | ||
841 | assert(m); | |
842 | assert(in_addr); | |
843 | ||
844 | LIST_FOREACH(servers, s, m->dns_servers) { | |
845 | ||
846 | if (s->family == family && | |
847 | in_addr_equal(family, &s->address, in_addr)) | |
848 | return s; | |
849 | } | |
850 | ||
851 | return NULL; | |
852 | } | |
853 | ||
854 | DnsServer *manager_get_dns_server(Manager *m) { | |
855 | assert(m); | |
856 | ||
857 | if (!m->current_dns_server) | |
858 | m->current_dns_server = m->dns_servers; | |
859 | ||
860 | return m->current_dns_server; | |
861 | } | |
862 | ||
863 | void manager_next_dns_server(Manager *m) { | |
864 | assert(m); | |
865 | ||
866 | if (!m->current_dns_server) { | |
867 | m->current_dns_server = m->dns_servers; | |
868 | return; | |
869 | } | |
870 | ||
871 | if (!m->current_dns_server) | |
872 | return; | |
873 | ||
874 | if (m->current_dns_server->servers_next) { | |
875 | m->current_dns_server = m->current_dns_server->servers_next; | |
876 | return; | |
877 | } | |
878 | ||
879 | m->current_dns_server = m->dns_servers; | |
091a364c | 880 | } |
e1c95994 LP |
881 | |
882 | uint32_t manager_find_mtu(Manager *m) { | |
883 | uint32_t mtu = 0; | |
884 | Link *l; | |
885 | Iterator i; | |
886 | ||
887 | /* If we don't know on which link a DNS packet would be | |
888 | * delivered, let's find the largest MTU that works on all | |
889 | * interfaces we know of */ | |
890 | ||
891 | HASHMAP_FOREACH(l, m->links, i) { | |
892 | if (l->mtu <= 0) | |
893 | continue; | |
894 | ||
895 | if (mtu <= 0 || l->mtu < mtu) | |
896 | mtu = l->mtu; | |
897 | } | |
898 | ||
899 | return mtu; | |
900 | } |