Merge pull request #2611 from 0xAX/deserialize-clkid
[thirdparty/systemd.git] / src / resolve / resolved-manager.c
CommitLineData
091a364c
TG
1/***
2 This file is part of systemd.
3
4 Copyright 2014 Tom Gundersen <teg@jklm.no>
5
6 systemd is free software; you can redistribute it and/or modify it
7 under the terms of the GNU Lesser General Public License as published by
8 the Free Software Foundation; either version 2.1 of the License, or
9 (at your option) any later version.
10
11 systemd is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
15
16 You should have received a copy of the GNU Lesser General Public License
17 along with systemd; If not, see <http://www.gnu.org/licenses/>.
18 ***/
19
07630cea
LP
20#include <netinet/in.h>
21#include <poll.h>
74b2466e 22#include <sys/ioctl.h>
091a364c 23
a2a416f7 24#include "af-list.h"
b5efdb8a 25#include "alloc-util.h"
07630cea 26#include "dns-domain.h"
3ffd4af2 27#include "fd-util.h"
a5a807e6 28#include "fileio-label.h"
07630cea 29#include "hostname-util.h"
c004493c 30#include "io-util.h"
07630cea
LP
31#include "netlink-util.h"
32#include "network-internal.h"
822db23c 33#include "ordered-set.h"
6bedfcbb 34#include "parse-util.h"
3df3e884 35#include "random-util.h"
39d8db04 36#include "resolved-bus.h"
07630cea 37#include "resolved-conf.h"
dd0bc0f1 38#include "resolved-etc-hosts.h"
5f402ae8 39#include "resolved-llmnr.h"
07630cea 40#include "resolved-manager.h"
bc7702b0 41#include "resolved-mdns.h"
dd0bc0f1 42#include "resolved-resolv-conf.h"
07630cea 43#include "socket-util.h"
8b43440b 44#include "string-table.h"
07630cea
LP
45#include "string-util.h"
46#include "utf8.h"
74b2466e
LP
47
48#define SEND_TIMEOUT_USEC (200 * USEC_PER_MSEC)
49
1c4baffc 50static int manager_process_link(sd_netlink *rtnl, sd_netlink_message *mm, void *userdata) {
74b2466e
LP
51 Manager *m = userdata;
52 uint16_t type;
53 Link *l;
54 int ifindex, r;
55
56 assert(rtnl);
57 assert(m);
58 assert(mm);
59
1c4baffc 60 r = sd_netlink_message_get_type(mm, &type);
74b2466e
LP
61 if (r < 0)
62 goto fail;
63
64 r = sd_rtnl_message_link_get_ifindex(mm, &ifindex);
65 if (r < 0)
66 goto fail;
67
68 l = hashmap_get(m->links, INT_TO_PTR(ifindex));
69
70 switch (type) {
71
a2a416f7
LP
72 case RTM_NEWLINK:{
73 bool is_new = !l;
74b2466e 74
a2a416f7 75 if (!l) {
74b2466e
LP
76 r = link_new(m, &l, ifindex);
77 if (r < 0)
78 goto fail;
79 }
80
81 r = link_update_rtnl(l, mm);
82 if (r < 0)
83 goto fail;
84
21d73c87
LP
85 r = link_update_monitor(l);
86 if (r < 0)
87 goto fail;
88
a2a416f7
LP
89 if (is_new)
90 log_debug("Found new link %i/%s", ifindex, l->name);
91
74b2466e 92 break;
a2a416f7 93 }
74b2466e
LP
94
95 case RTM_DELLINK:
96 if (l) {
a2a416f7 97 log_debug("Removing link %i/%s", l->ifindex, l->name);
74b2466e
LP
98 link_free(l);
99 }
100
101 break;
102 }
103
104 return 0;
105
106fail:
da927ba9 107 log_warning_errno(r, "Failed to process RTNL link message: %m");
74b2466e
LP
108 return 0;
109}
110
1c4baffc 111static int manager_process_address(sd_netlink *rtnl, sd_netlink_message *mm, void *userdata) {
74b2466e
LP
112 Manager *m = userdata;
113 union in_addr_union address;
74b2466e 114 uint16_t type;
0dd25fb9 115 int r, ifindex, family;
74b2466e
LP
116 LinkAddress *a;
117 Link *l;
118
119 assert(rtnl);
120 assert(mm);
121 assert(m);
122
1c4baffc 123 r = sd_netlink_message_get_type(mm, &type);
74b2466e
LP
124 if (r < 0)
125 goto fail;
126
127 r = sd_rtnl_message_addr_get_ifindex(mm, &ifindex);
128 if (r < 0)
129 goto fail;
130
131 l = hashmap_get(m->links, INT_TO_PTR(ifindex));
132 if (!l)
133 return 0;
134
135 r = sd_rtnl_message_addr_get_family(mm, &family);
136 if (r < 0)
137 goto fail;
138
139 switch (family) {
140
141 case AF_INET:
1c4baffc 142 r = sd_netlink_message_read_in_addr(mm, IFA_LOCAL, &address.in);
74b2466e 143 if (r < 0) {
1c4baffc 144 r = sd_netlink_message_read_in_addr(mm, IFA_ADDRESS, &address.in);
74b2466e
LP
145 if (r < 0)
146 goto fail;
147 }
148
149 break;
150
151 case AF_INET6:
1c4baffc 152 r = sd_netlink_message_read_in6_addr(mm, IFA_LOCAL, &address.in6);
74b2466e 153 if (r < 0) {
1c4baffc 154 r = sd_netlink_message_read_in6_addr(mm, IFA_ADDRESS, &address.in6);
74b2466e
LP
155 if (r < 0)
156 goto fail;
157 }
158
159 break;
160
161 default:
162 return 0;
163 }
164
165 a = link_find_address(l, family, &address);
166
167 switch (type) {
168
169 case RTM_NEWADDR:
170
171 if (!a) {
172 r = link_address_new(l, &a, family, &address);
173 if (r < 0)
174 return r;
175 }
176
177 r = link_address_update_rtnl(a, mm);
178 if (r < 0)
179 return r;
180
181 break;
182
183 case RTM_DELADDR:
3e044c49 184 link_address_free(a);
74b2466e
LP
185 break;
186 }
187
188 return 0;
189
190fail:
da927ba9 191 log_warning_errno(r, "Failed to process RTNL address message: %m");
74b2466e
LP
192 return 0;
193}
194
74b2466e 195static int manager_rtnl_listen(Manager *m) {
4afd3348 196 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL;
1c4baffc 197 sd_netlink_message *i;
74b2466e
LP
198 int r;
199
200 assert(m);
201
cc98b302 202 /* First, subscribe to interfaces coming and going */
1c4baffc 203 r = sd_netlink_open(&m->rtnl);
74b2466e
LP
204 if (r < 0)
205 return r;
206
2d895038 207 r = sd_netlink_attach_event(m->rtnl, m->event, SD_EVENT_PRIORITY_IMPORTANT);
74b2466e
LP
208 if (r < 0)
209 return r;
210
1c4baffc 211 r = sd_netlink_add_match(m->rtnl, RTM_NEWLINK, manager_process_link, m);
74b2466e
LP
212 if (r < 0)
213 return r;
214
1c4baffc 215 r = sd_netlink_add_match(m->rtnl, RTM_DELLINK, manager_process_link, m);
74b2466e
LP
216 if (r < 0)
217 return r;
218
1c4baffc 219 r = sd_netlink_add_match(m->rtnl, RTM_NEWADDR, manager_process_address, m);
74b2466e
LP
220 if (r < 0)
221 return r;
091a364c 222
1c4baffc 223 r = sd_netlink_add_match(m->rtnl, RTM_DELADDR, manager_process_address, m);
74b2466e
LP
224 if (r < 0)
225 return r;
226
227 /* Then, enumerate all links */
228 r = sd_rtnl_message_new_link(m->rtnl, &req, RTM_GETLINK, 0);
229 if (r < 0)
230 return r;
231
1c4baffc 232 r = sd_netlink_message_request_dump(req, true);
74b2466e
LP
233 if (r < 0)
234 return r;
235
1c4baffc 236 r = sd_netlink_call(m->rtnl, req, 0, &reply);
74b2466e
LP
237 if (r < 0)
238 return r;
239
1c4baffc 240 for (i = reply; i; i = sd_netlink_message_next(i)) {
74b2466e
LP
241 r = manager_process_link(m->rtnl, i, m);
242 if (r < 0)
243 return r;
244 }
245
1c4baffc
TG
246 req = sd_netlink_message_unref(req);
247 reply = sd_netlink_message_unref(reply);
74b2466e
LP
248
249 /* Finally, enumerate all addresses, too */
250 r = sd_rtnl_message_new_addr(m->rtnl, &req, RTM_GETADDR, 0, AF_UNSPEC);
251 if (r < 0)
252 return r;
253
1c4baffc 254 r = sd_netlink_message_request_dump(req, true);
74b2466e
LP
255 if (r < 0)
256 return r;
257
1c4baffc 258 r = sd_netlink_call(m->rtnl, req, 0, &reply);
74b2466e
LP
259 if (r < 0)
260 return r;
261
1c4baffc 262 for (i = reply; i; i = sd_netlink_message_next(i)) {
74b2466e
LP
263 r = manager_process_address(m->rtnl, i, m);
264 if (r < 0)
265 return r;
266 }
267
268 return r;
269}
270
271static int on_network_event(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
272 Manager *m = userdata;
273 Iterator i;
274 Link *l;
275 int r;
276
277 assert(m);
278
279 sd_network_monitor_flush(m->network_monitor);
280
281 HASHMAP_FOREACH(l, m->links, i) {
282 r = link_update_monitor(l);
283 if (r < 0)
da927ba9 284 log_warning_errno(r, "Failed to update monitor information for %i: %m", l->ifindex);
74b2466e
LP
285 }
286
287 r = manager_write_resolv_conf(m);
288 if (r < 0)
77abf3c1 289 log_warning_errno(r, "Could not update "PRIVATE_RESOLV_CONF": %m");
74b2466e
LP
290
291 return 0;
292}
293
294static int manager_network_monitor_listen(Manager *m) {
295 int r, fd, events;
296
297 assert(m);
298
0014a4ad 299 r = sd_network_monitor_new(&m->network_monitor, NULL);
74b2466e
LP
300 if (r < 0)
301 return r;
302
303 fd = sd_network_monitor_get_fd(m->network_monitor);
304 if (fd < 0)
305 return fd;
306
307 events = sd_network_monitor_get_events(m->network_monitor);
308 if (events < 0)
309 return events;
310
311 r = sd_event_add_io(m->event, &m->network_event_source, fd, events, &on_network_event, m);
312 if (r < 0)
2d895038
LP
313 return r;
314
315 r = sd_event_source_set_priority(m->network_event_source, SD_EVENT_PRIORITY_IMPORTANT+5);
316 if (r < 0)
74b2466e
LP
317 return r;
318
aa4a9deb
LP
319 (void) sd_event_source_set_description(m->network_event_source, "network-monitor");
320
74b2466e
LP
321 return 0;
322}
323
78c6a153 324static int determine_hostname(char **llmnr_hostname, char **mdns_hostname) {
eb60f9cd 325 _cleanup_free_ char *h = NULL, *n = NULL;
78c6a153
LP
326 char label[DNS_LABEL_MAX];
327 const char *p;
328 int r, k;
eb60f9cd 329
78c6a153
LP
330 assert(llmnr_hostname);
331 assert(mdns_hostname);
332
333 /* Extract and normalize the first label of the locally
334 * configured hostname, and check it's not "localhost". */
eb60f9cd
LP
335
336 h = gethostname_malloc();
337 if (!h)
338 return log_oom();
339
78c6a153
LP
340 p = h;
341 r = dns_label_unescape(&p, label, sizeof(label));
342 if (r < 0)
343 return log_error_errno(r, "Failed to unescape host name: %m");
344 if (r == 0) {
345 log_error("Couldn't find a single label in hosntame.");
346 return -EINVAL;
347 }
348
349 k = dns_label_undo_idna(label, r, label, sizeof(label));
350 if (k < 0)
351 return log_error_errno(k, "Failed to undo IDNA: %m");
352 if (k > 0)
353 r = k;
354
355 if (!utf8_is_valid(label)) {
eb60f9cd
LP
356 log_error("System hostname is not UTF-8 clean.");
357 return -EINVAL;
358 }
359
422baca0 360 r = dns_label_escape_new(label, r, &n);
78c6a153
LP
361 if (r < 0)
362 return log_error_errno(r, "Failed to escape host name: %m");
363
364 if (is_localhost(n)) {
365 log_debug("System hostname is 'localhost', ignoring.");
366 return -EINVAL;
eb60f9cd
LP
367 }
368
78c6a153
LP
369 r = dns_name_concat(n, "local", mdns_hostname);
370 if (r < 0)
371 return log_error_errno(r, "Failed to determine mDNS hostname: %m");
372
373 *llmnr_hostname = n;
eb60f9cd
LP
374 n = NULL;
375
376 return 0;
377}
378
379static int on_hostname_change(sd_event_source *es, int fd, uint32_t revents, void *userdata) {
78c6a153 380 _cleanup_free_ char *llmnr_hostname = NULL, *mdns_hostname = NULL;
eb60f9cd
LP
381 Manager *m = userdata;
382 int r;
383
384 assert(m);
385
78c6a153 386 r = determine_hostname(&llmnr_hostname, &mdns_hostname);
eb60f9cd
LP
387 if (r < 0)
388 return 0; /* ignore invalid hostnames */
389
78c6a153 390 if (streq(llmnr_hostname, m->llmnr_hostname) && streq(mdns_hostname, m->mdns_hostname))
eb60f9cd
LP
391 return 0;
392
78c6a153
LP
393 log_info("System hostname changed to '%s'.", llmnr_hostname);
394
395 free(m->llmnr_hostname);
396 free(m->mdns_hostname);
397
398 m->llmnr_hostname = llmnr_hostname;
399 m->mdns_hostname = mdns_hostname;
400
401 llmnr_hostname = mdns_hostname = NULL;
eb60f9cd
LP
402
403 manager_refresh_rrs(m);
404
405 return 0;
406}
407
408static int manager_watch_hostname(Manager *m) {
eb60f9cd
LP
409 int r;
410
411 assert(m);
412
413 m->hostname_fd = open("/proc/sys/kernel/hostname", O_RDONLY|O_CLOEXEC|O_NDELAY|O_NOCTTY);
414 if (m->hostname_fd < 0) {
56f64d95 415 log_warning_errno(errno, "Failed to watch hostname: %m");
eb60f9cd
LP
416 return 0;
417 }
418
419 r = sd_event_add_io(m->event, &m->hostname_event_source, m->hostname_fd, 0, on_hostname_change, m);
420 if (r < 0) {
421 if (r == -EPERM)
422 /* kernels prior to 3.2 don't support polling this file. Ignore the failure. */
423 m->hostname_fd = safe_close(m->hostname_fd);
8d3d7072
MS
424 else
425 return log_error_errno(r, "Failed to add hostname event source: %m");
eb60f9cd
LP
426 }
427
aa4a9deb
LP
428 (void) sd_event_source_set_description(m->hostname_event_source, "hostname");
429
78c6a153 430 r = determine_hostname(&m->llmnr_hostname, &m->mdns_hostname);
eb60f9cd
LP
431 if (r < 0) {
432 log_info("Defaulting to hostname 'linux'.");
78c6a153
LP
433 m->llmnr_hostname = strdup("linux");
434 if (!m->llmnr_hostname)
435 return log_oom();
436
437 m->mdns_hostname = strdup("linux.local");
438 if (!m->mdns_hostname)
eb60f9cd
LP
439 return log_oom();
440 } else
78c6a153 441 log_info("Using system hostname '%s'.", m->llmnr_hostname);
eb60f9cd
LP
442
443 return 0;
444}
445
4d506d6b
LP
446static int manager_sigusr1(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
447 _cleanup_free_ char *buffer = NULL;
448 _cleanup_fclose_ FILE *f = NULL;
449 Manager *m = userdata;
450 size_t size = 0;
451 DnsScope *scope;
452
453 assert(s);
454 assert(si);
455 assert(m);
456
457 f = open_memstream(&buffer, &size);
458 if (!f)
459 return log_oom();
460
461 LIST_FOREACH(scopes, scope, m->dns_scopes)
462 dns_scope_dump(scope, f);
463
464 if (fflush_and_check(f) < 0)
465 return log_oom();
466
467 log_dump(LOG_INFO, buffer);
468 return 0;
469}
470
091a364c 471int manager_new(Manager **ret) {
74b2466e 472 _cleanup_(manager_freep) Manager *m = NULL;
091a364c
TG
473 int r;
474
c92e531c
LP
475 assert(ret);
476
091a364c
TG
477 m = new0(Manager, 1);
478 if (!m)
479 return -ENOMEM;
480
1716f6dc 481 m->llmnr_ipv4_udp_fd = m->llmnr_ipv6_udp_fd = -1;
623a4c97 482 m->llmnr_ipv4_tcp_fd = m->llmnr_ipv6_tcp_fd = -1;
bc7702b0 483 m->mdns_ipv4_fd = m->mdns_ipv6_fd = -1;
eb60f9cd 484 m->hostname_fd = -1;
1716f6dc 485
af49ca27 486 m->llmnr_support = RESOLVE_SUPPORT_YES;
ad6c0475
LP
487 m->mdns_support = RESOLVE_SUPPORT_NO;
488 m->dnssec_mode = DNSSEC_NO;
5cb36f41 489 m->read_resolv_conf = true;
00fa60ae 490 m->need_builtin_fallbacks = true;
dd0bc0f1 491 m->etc_hosts_last = m->etc_hosts_mtime = USEC_INFINITY;
091a364c 492
0d2cd476
LP
493 r = dns_trust_anchor_load(&m->trust_anchor);
494 if (r < 0)
495 return r;
496
ad6c0475
LP
497 r = manager_parse_config_file(m);
498 if (r < 0)
499 return r;
500
091a364c
TG
501 r = sd_event_default(&m->event);
502 if (r < 0)
503 return r;
504
505 sd_event_add_signal(m->event, NULL, SIGTERM, NULL, NULL);
506 sd_event_add_signal(m->event, NULL, SIGINT, NULL, NULL);
507
508 sd_event_set_watchdog(m->event, true);
509
eb60f9cd
LP
510 r = manager_watch_hostname(m);
511 if (r < 0)
512 return r;
513
1716f6dc 514 r = dns_scope_new(m, &m->unicast_scope, NULL, DNS_PROTOCOL_DNS, AF_UNSPEC);
74b2466e
LP
515 if (r < 0)
516 return r;
517
518 r = manager_network_monitor_listen(m);
519 if (r < 0)
520 return r;
521
522 r = manager_rtnl_listen(m);
523 if (r < 0)
524 return r;
525
526 r = manager_connect_bus(m);
527 if (r < 0)
528 return r;
529
4d506d6b
LP
530 (void) sd_event_add_signal(m->event, &m->sigusr1_event_source, SIGUSR1, manager_sigusr1, m);
531
091a364c
TG
532 *ret = m;
533 m = NULL;
534
535 return 0;
536}
537
edc501d4
LP
538int manager_start(Manager *m) {
539 int r;
540
541 assert(m);
542
543 r = manager_llmnr_start(m);
544 if (r < 0)
545 return r;
546
bc7702b0
DM
547 r = manager_mdns_start(m);
548 if (r < 0)
549 return r;
550
edc501d4
LP
551 return 0;
552}
553
74b2466e
LP
554Manager *manager_free(Manager *m) {
555 Link *l;
091a364c
TG
556
557 if (!m)
74b2466e
LP
558 return NULL;
559
4b95f179
LP
560 dns_server_unlink_all(m->dns_servers);
561 dns_server_unlink_all(m->fallback_dns_servers);
a51c1048
LP
562 dns_search_domain_unlink_all(m->search_domains);
563
74b2466e
LP
564 while ((l = hashmap_first(m->links)))
565 link_free(l);
f0e15467
LP
566
567 while (m->dns_queries)
568 dns_query_free(m->dns_queries);
74b2466e 569
cab5b059
LP
570 dns_scope_free(m->unicast_scope);
571
f0e15467
LP
572 hashmap_free(m->links);
573 hashmap_free(m->dns_transactions);
574
096b6773
LP
575 sd_event_source_unref(m->network_event_source);
576 sd_network_monitor_unref(m->network_monitor);
091a364c 577
a564ca2f
LP
578 sd_netlink_unref(m->rtnl);
579 sd_event_source_unref(m->rtnl_event_source);
580
edc501d4 581 manager_llmnr_stop(m);
bc7702b0 582 manager_mdns_stop(m);
623a4c97 583
902bb5d8 584 sd_bus_slot_unref(m->prepare_for_sleep_slot);
74b2466e
LP
585 sd_event_source_unref(m->bus_retry_event_source);
586 sd_bus_unref(m->bus);
091a364c 587
4d506d6b
LP
588 sd_event_source_unref(m->sigusr1_event_source);
589
74b2466e 590 sd_event_unref(m->event);
623a4c97 591
78c6a153
LP
592 dns_resource_key_unref(m->llmnr_host_ipv4_key);
593 dns_resource_key_unref(m->llmnr_host_ipv6_key);
eb60f9cd 594
eb60f9cd 595 sd_event_source_unref(m->hostname_event_source);
d9fcf2ba 596 safe_close(m->hostname_fd);
78c6a153
LP
597 free(m->llmnr_hostname);
598 free(m->mdns_hostname);
eb60f9cd 599
0d2cd476 600 dns_trust_anchor_flush(&m->trust_anchor);
dd0bc0f1 601 manager_etc_hosts_flush(m);
0d2cd476 602
091a364c 603 free(m);
74b2466e
LP
604
605 return NULL;
091a364c
TG
606}
607
1716f6dc 608int manager_recv(Manager *m, int fd, DnsProtocol protocol, DnsPacket **ret) {
74b2466e 609 _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL;
1716f6dc
LP
610 union {
611 struct cmsghdr header; /* For alignment */
40a1eebd 612 uint8_t buffer[CMSG_SPACE(MAXSIZE(struct in_pktinfo, struct in6_pktinfo))
1716f6dc 613 + CMSG_SPACE(int) /* ttl/hoplimit */
623a4c97 614 + EXTRA_CMSG_SPACE /* kernel appears to require extra buffer space */];
1716f6dc
LP
615 } control;
616 union sockaddr_union sa;
74b2466e 617 struct msghdr mh = {};
1716f6dc 618 struct cmsghdr *cmsg;
74b2466e 619 struct iovec iov;
1716f6dc 620 int ms = 0, r;
74b2466e
LP
621 ssize_t l;
622
623 assert(m);
1716f6dc 624 assert(fd >= 0);
74b2466e
LP
625 assert(ret);
626
74b2466e
LP
627 r = ioctl(fd, FIONREAD, &ms);
628 if (r < 0)
629 return -errno;
630 if (ms < 0)
631 return -EIO;
632
1716f6dc 633 r = dns_packet_new(&p, protocol, ms);
74b2466e
LP
634 if (r < 0)
635 return r;
636
637 iov.iov_base = DNS_PACKET_DATA(p);
638 iov.iov_len = p->allocated;
639
1716f6dc
LP
640 mh.msg_name = &sa.sa;
641 mh.msg_namelen = sizeof(sa);
74b2466e
LP
642 mh.msg_iov = &iov;
643 mh.msg_iovlen = 1;
1716f6dc
LP
644 mh.msg_control = &control;
645 mh.msg_controllen = sizeof(control);
74b2466e 646
a38d9945 647 l = recvmsg(fd, &mh, 0);
74b2466e 648 if (l < 0) {
ad867662 649 if (errno == EAGAIN || errno == EINTR)
74b2466e
LP
650 return 0;
651
652 return -errno;
091a364c
TG
653 }
654
74b2466e
LP
655 if (l <= 0)
656 return -EIO;
091a364c 657
1716f6dc
LP
658 assert(!(mh.msg_flags & MSG_CTRUNC));
659 assert(!(mh.msg_flags & MSG_TRUNC));
660
74b2466e 661 p->size = (size_t) l;
091a364c 662
1716f6dc 663 p->family = sa.sa.sa_family;
623a4c97
LP
664 p->ipproto = IPPROTO_UDP;
665 if (p->family == AF_INET) {
1716f6dc 666 p->sender.in = sa.in.sin_addr;
623a4c97
LP
667 p->sender_port = be16toh(sa.in.sin_port);
668 } else if (p->family == AF_INET6) {
1716f6dc 669 p->sender.in6 = sa.in6.sin6_addr;
623a4c97
LP
670 p->sender_port = be16toh(sa.in6.sin6_port);
671 p->ifindex = sa.in6.sin6_scope_id;
672 } else
1716f6dc 673 return -EAFNOSUPPORT;
74b2466e 674
2a1288ff 675 CMSG_FOREACH(cmsg, &mh) {
74b2466e 676
1716f6dc
LP
677 if (cmsg->cmsg_level == IPPROTO_IPV6) {
678 assert(p->family == AF_INET6);
74b2466e 679
1716f6dc 680 switch (cmsg->cmsg_type) {
74b2466e 681
1716f6dc
LP
682 case IPV6_PKTINFO: {
683 struct in6_pktinfo *i = (struct in6_pktinfo*) CMSG_DATA(cmsg);
74b2466e 684
623a4c97
LP
685 if (p->ifindex <= 0)
686 p->ifindex = i->ipi6_ifindex;
687
1716f6dc
LP
688 p->destination.in6 = i->ipi6_addr;
689 break;
690 }
74b2466e 691
1716f6dc
LP
692 case IPV6_HOPLIMIT:
693 p->ttl = *(int *) CMSG_DATA(cmsg);
694 break;
74b2466e 695
1716f6dc
LP
696 }
697 } else if (cmsg->cmsg_level == IPPROTO_IP) {
698 assert(p->family == AF_INET);
74b2466e 699
1716f6dc 700 switch (cmsg->cmsg_type) {
74b2466e 701
1716f6dc
LP
702 case IP_PKTINFO: {
703 struct in_pktinfo *i = (struct in_pktinfo*) CMSG_DATA(cmsg);
091a364c 704
623a4c97
LP
705 if (p->ifindex <= 0)
706 p->ifindex = i->ipi_ifindex;
707
1716f6dc
LP
708 p->destination.in = i->ipi_addr;
709 break;
710 }
74b2466e 711
623a4c97 712 case IP_TTL:
1716f6dc
LP
713 p->ttl = *(int *) CMSG_DATA(cmsg);
714 break;
715 }
716 }
717 }
74b2466e 718
623a4c97
LP
719 /* The Linux kernel sets the interface index to the loopback
720 * device if the packet came from the local host since it
721 * avoids the routing table in such a case. Let's unset the
722 * interface index in such a case. */
a5f03596 723 if (p->ifindex == LOOPBACK_IFINDEX)
623a4c97
LP
724 p->ifindex = 0;
725
86ad4cd7
TG
726 if (protocol != DNS_PROTOCOL_DNS) {
727 /* If we don't know the interface index still, we look for the
728 * first local interface with a matching address. Yuck! */
729 if (p->ifindex <= 0)
730 p->ifindex = manager_find_ifindex(m, p->family, &p->destination);
731 }
623a4c97 732
74b2466e
LP
733 *ret = p;
734 p = NULL;
735
736 return 1;
737}
738
74b2466e
LP
739static int sendmsg_loop(int fd, struct msghdr *mh, int flags) {
740 int r;
741
742 assert(fd >= 0);
743 assert(mh);
744
745 for (;;) {
746 if (sendmsg(fd, mh, flags) >= 0)
747 return 0;
748
749 if (errno == EINTR)
750 continue;
751
752 if (errno != EAGAIN)
753 return -errno;
754
755 r = fd_wait_for_event(fd, POLLOUT, SEND_TIMEOUT_USEC);
756 if (r < 0)
757 return r;
758 if (r == 0)
759 return -ETIMEDOUT;
760 }
761}
762
72290734
TG
763static int write_loop(int fd, void *message, size_t length) {
764 int r;
765
766 assert(fd >= 0);
767 assert(message);
768
769 for (;;) {
770 if (write(fd, message, length) >= 0)
771 return 0;
772
773 if (errno == EINTR)
774 continue;
775
776 if (errno != EAGAIN)
777 return -errno;
778
779 r = fd_wait_for_event(fd, POLLOUT, SEND_TIMEOUT_USEC);
780 if (r < 0)
781 return r;
782 if (r == 0)
783 return -ETIMEDOUT;
784 }
785}
786
787int manager_write(Manager *m, int fd, DnsPacket *p) {
788 int r;
789
deb3f3d3 790 log_debug("Sending %s packet with id %" PRIu16 ".", DNS_PACKET_QR(p) ? "response" : "query", DNS_PACKET_ID(p));
72290734
TG
791
792 r = write_loop(fd, DNS_PACKET_DATA(p), p->size);
793 if (r < 0)
794 return r;
795
796 return 0;
797}
798
623a4c97 799static int manager_ipv4_send(Manager *m, int fd, int ifindex, const struct in_addr *addr, uint16_t port, DnsPacket *p) {
74b2466e
LP
800 union sockaddr_union sa = {
801 .in.sin_family = AF_INET,
74b2466e 802 };
1716f6dc
LP
803 union {
804 struct cmsghdr header; /* For alignment */
805 uint8_t buffer[CMSG_SPACE(sizeof(struct in_pktinfo))];
806 } control;
74b2466e
LP
807 struct msghdr mh = {};
808 struct iovec iov;
74b2466e
LP
809
810 assert(m);
1716f6dc
LP
811 assert(fd >= 0);
812 assert(addr);
813 assert(port > 0);
74b2466e
LP
814 assert(p);
815
74b2466e
LP
816 iov.iov_base = DNS_PACKET_DATA(p);
817 iov.iov_len = p->size;
091a364c 818
1716f6dc
LP
819 sa.in.sin_addr = *addr;
820 sa.in.sin_port = htobe16(port),
091a364c 821
74b2466e
LP
822 mh.msg_iov = &iov;
823 mh.msg_iovlen = 1;
824 mh.msg_name = &sa.sa;
825 mh.msg_namelen = sizeof(sa.in);
091a364c 826
74b2466e
LP
827 if (ifindex > 0) {
828 struct cmsghdr *cmsg;
829 struct in_pktinfo *pi;
830
831 zero(control);
832
1716f6dc 833 mh.msg_control = &control;
74b2466e
LP
834 mh.msg_controllen = CMSG_LEN(sizeof(struct in_pktinfo));
835
836 cmsg = CMSG_FIRSTHDR(&mh);
837 cmsg->cmsg_len = mh.msg_controllen;
838 cmsg->cmsg_level = IPPROTO_IP;
839 cmsg->cmsg_type = IP_PKTINFO;
840
841 pi = (struct in_pktinfo*) CMSG_DATA(cmsg);
842 pi->ipi_ifindex = ifindex;
843 }
844
845 return sendmsg_loop(fd, &mh, 0);
846}
847
623a4c97 848static int manager_ipv6_send(Manager *m, int fd, int ifindex, const struct in6_addr *addr, uint16_t port, DnsPacket *p) {
74b2466e
LP
849 union sockaddr_union sa = {
850 .in6.sin6_family = AF_INET6,
74b2466e 851 };
1716f6dc
LP
852 union {
853 struct cmsghdr header; /* For alignment */
854 uint8_t buffer[CMSG_SPACE(sizeof(struct in6_pktinfo))];
855 } control;
74b2466e
LP
856 struct msghdr mh = {};
857 struct iovec iov;
74b2466e
LP
858
859 assert(m);
1716f6dc
LP
860 assert(fd >= 0);
861 assert(addr);
862 assert(port > 0);
74b2466e
LP
863 assert(p);
864
74b2466e
LP
865 iov.iov_base = DNS_PACKET_DATA(p);
866 iov.iov_len = p->size;
867
1716f6dc
LP
868 sa.in6.sin6_addr = *addr;
869 sa.in6.sin6_port = htobe16(port),
74b2466e
LP
870 sa.in6.sin6_scope_id = ifindex;
871
872 mh.msg_iov = &iov;
873 mh.msg_iovlen = 1;
874 mh.msg_name = &sa.sa;
875 mh.msg_namelen = sizeof(sa.in6);
876
877 if (ifindex > 0) {
878 struct cmsghdr *cmsg;
879 struct in6_pktinfo *pi;
880
881 zero(control);
882
1716f6dc 883 mh.msg_control = &control;
74b2466e
LP
884 mh.msg_controllen = CMSG_LEN(sizeof(struct in6_pktinfo));
885
886 cmsg = CMSG_FIRSTHDR(&mh);
887 cmsg->cmsg_len = mh.msg_controllen;
888 cmsg->cmsg_level = IPPROTO_IPV6;
889 cmsg->cmsg_type = IPV6_PKTINFO;
890
891 pi = (struct in6_pktinfo*) CMSG_DATA(cmsg);
892 pi->ipi6_ifindex = ifindex;
893 }
894
895 return sendmsg_loop(fd, &mh, 0);
896}
897
623a4c97 898int manager_send(Manager *m, int fd, int ifindex, int family, const union in_addr_union *addr, uint16_t port, DnsPacket *p) {
1716f6dc
LP
899 assert(m);
900 assert(fd >= 0);
901 assert(addr);
902 assert(port > 0);
903 assert(p);
904
deb3f3d3 905 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 906
1716f6dc
LP
907 if (family == AF_INET)
908 return manager_ipv4_send(m, fd, ifindex, &addr->in, port, p);
909 else if (family == AF_INET6)
910 return manager_ipv6_send(m, fd, ifindex, &addr->in6, port, p);
911
912 return -EAFNOSUPPORT;
913}
914
e1c95994
LP
915uint32_t manager_find_mtu(Manager *m) {
916 uint32_t mtu = 0;
917 Link *l;
918 Iterator i;
919
920 /* If we don't know on which link a DNS packet would be
921 * delivered, let's find the largest MTU that works on all
922 * interfaces we know of */
923
924 HASHMAP_FOREACH(l, m->links, i) {
925 if (l->mtu <= 0)
926 continue;
927
928 if (mtu <= 0 || l->mtu < mtu)
929 mtu = l->mtu;
930 }
931
932 return mtu;
933}
1716f6dc 934
623a4c97 935int manager_find_ifindex(Manager *m, int family, const union in_addr_union *in_addr) {
ec2c5e43
LP
936 LinkAddress *a;
937
938 assert(m);
939
4e945a6f 940 a = manager_find_link_address(m, family, in_addr);
ec2c5e43
LP
941 if (a)
942 return a->link->ifindex;
943
944 return 0;
945}
946
eb60f9cd
LP
947void manager_refresh_rrs(Manager *m) {
948 Iterator i;
949 Link *l;
950
951 assert(m);
952
78c6a153
LP
953 m->llmnr_host_ipv4_key = dns_resource_key_unref(m->llmnr_host_ipv4_key);
954 m->llmnr_host_ipv6_key = dns_resource_key_unref(m->llmnr_host_ipv6_key);
eb60f9cd
LP
955
956 HASHMAP_FOREACH(l, m->links, i) {
957 link_add_rrs(l, true);
958 link_add_rrs(l, false);
959 }
960}
961
ec2c5e43
LP
962int manager_next_hostname(Manager *m) {
963 const char *p;
556a2294 964 uint64_t u, a;
78c6a153
LP
965 char *h, *k;
966 int r;
623a4c97
LP
967
968 assert(m);
969
78c6a153 970 p = strchr(m->llmnr_hostname, 0);
ec2c5e43
LP
971 assert(p);
972
78c6a153 973 while (p > m->llmnr_hostname) {
ec2c5e43
LP
974 if (!strchr("0123456789", p[-1]))
975 break;
976
977 p--;
978 }
979
980 if (*p == 0 || safe_atou64(p, &u) < 0 || u <= 0)
981 u = 1;
982
556a2294
LP
983 /* Add a random number to the old value. This way we can avoid
984 * that two hosts pick the same hostname, win on IPv4 and lose
985 * on IPv6 (or vice versa), and pick the same hostname
986 * replacement hostname, ad infinitum. We still want the
987 * numbers to go up monotonically, hence we just add a random
988 * value 1..10 */
989
990 random_bytes(&a, sizeof(a));
991 u += 1 + a % 10;
ec2c5e43 992
78c6a153 993 if (asprintf(&h, "%.*s%" PRIu64, (int) (p - m->llmnr_hostname), m->llmnr_hostname, u) < 0)
ec2c5e43
LP
994 return -ENOMEM;
995
78c6a153
LP
996 r = dns_name_concat(h, "local", &k);
997 if (r < 0) {
998 free(h);
999 return r;
1000 }
1001
1002 log_info("Hostname conflict, changing published hostname from '%s' to '%s'.", m->llmnr_hostname, h);
1003
1004 free(m->llmnr_hostname);
1005 m->llmnr_hostname = h;
ec2c5e43 1006
78c6a153
LP
1007 free(m->mdns_hostname);
1008 m->mdns_hostname = k;
ec2c5e43 1009
eb60f9cd 1010 manager_refresh_rrs(m);
623a4c97
LP
1011
1012 return 0;
1013}
ec2c5e43 1014
4e945a6f 1015LinkAddress* manager_find_link_address(Manager *m, int family, const union in_addr_union *in_addr) {
ec2c5e43
LP
1016 Iterator i;
1017 Link *l;
1018
1019 assert(m);
1020
1021 HASHMAP_FOREACH(l, m->links, i) {
1022 LinkAddress *a;
1023
1024 a = link_find_address(l, family, in_addr);
1025 if (a)
1026 return a;
1027 }
1028
1029 return NULL;
1030}
1031
a4076574 1032bool manager_our_packet(Manager *m, DnsPacket *p) {
ec2c5e43
LP
1033 assert(m);
1034 assert(p);
1035
4e945a6f 1036 return !!manager_find_link_address(m, p->family, &p->sender);
ec2c5e43 1037}
4e945a6f 1038
a4076574
LP
1039DnsScope* manager_find_scope(Manager *m, DnsPacket *p) {
1040 Link *l;
1041
1042 assert(m);
1043 assert(p);
1044
1045 l = hashmap_get(m->links, INT_TO_PTR(p->ifindex));
1046 if (!l)
1047 return NULL;
1048
b4f1862d
DM
1049 switch (p->protocol) {
1050 case DNS_PROTOCOL_LLMNR:
a4076574
LP
1051 if (p->family == AF_INET)
1052 return l->llmnr_ipv4_scope;
1053 else if (p->family == AF_INET6)
1054 return l->llmnr_ipv6_scope;
b4f1862d
DM
1055
1056 break;
1057
1058 case DNS_PROTOCOL_MDNS:
1059 if (p->family == AF_INET)
1060 return l->mdns_ipv4_scope;
1061 else if (p->family == AF_INET6)
1062 return l->mdns_ipv6_scope;
1063
1064 break;
1065
1066 default:
1067 break;
a4076574
LP
1068 }
1069
1070 return NULL;
1071}
1072
902bb5d8
LP
1073void manager_verify_all(Manager *m) {
1074 DnsScope *s;
1075
1076 assert(m);
1077
1078 LIST_FOREACH(scopes, s, m->dns_scopes)
1079 dns_zone_verify_all(&s->zone);
1080}
1081
78c6a153 1082int manager_is_own_hostname(Manager *m, const char *name) {
78c6a153
LP
1083 int r;
1084
1085 assert(m);
1086 assert(name);
1087
1088 if (m->llmnr_hostname) {
1089 r = dns_name_equal(name, m->llmnr_hostname);
1090 if (r != 0)
1091 return r;
1092 }
1093
1094 if (m->mdns_hostname)
1095 return dns_name_equal(name, m->mdns_hostname);
1096
1097 return 0;
1098}
1099
9176a57c
LP
1100int manager_compile_dns_servers(Manager *m, OrderedSet **dns) {
1101 DnsServer *s;
1102 Iterator i;
1103 Link *l;
1104 int r;
1105
1106 assert(m);
1107 assert(dns);
1108
1109 r = ordered_set_ensure_allocated(dns, &dns_server_hash_ops);
1110 if (r < 0)
1111 return r;
1112
1113 /* First add the system-wide servers and domains */
1114 LIST_FOREACH(servers, s, m->dns_servers) {
1115 r = ordered_set_put(*dns, s);
1116 if (r == -EEXIST)
1117 continue;
1118 if (r < 0)
1119 return r;
1120 }
1121
1122 /* Then, add the per-link servers */
1123 HASHMAP_FOREACH(l, m->links, i) {
1124 LIST_FOREACH(servers, s, l->dns_servers) {
1125 r = ordered_set_put(*dns, s);
1126 if (r == -EEXIST)
1127 continue;
1128 if (r < 0)
1129 return r;
1130 }
1131 }
1132
1133 /* If we found nothing, add the fallback servers */
1134 if (ordered_set_isempty(*dns)) {
1135 LIST_FOREACH(servers, s, m->fallback_dns_servers) {
1136 r = ordered_set_put(*dns, s);
1137 if (r == -EEXIST)
1138 continue;
1139 if (r < 0)
1140 return r;
1141 }
1142 }
1143
1144 return 0;
1145}
1146
1147int manager_compile_search_domains(Manager *m, OrderedSet **domains) {
1148 DnsSearchDomain *d;
1149 Iterator i;
1150 Link *l;
1151 int r;
1152
1153 assert(m);
1154 assert(domains);
1155
1156 r = ordered_set_ensure_allocated(domains, &dns_name_hash_ops);
1157 if (r < 0)
1158 return r;
1159
1160 LIST_FOREACH(domains, d, m->search_domains) {
1161 r = ordered_set_put(*domains, d->name);
1162 if (r == -EEXIST)
1163 continue;
1164 if (r < 0)
1165 return r;
1166 }
1167
1168 HASHMAP_FOREACH(l, m->links, i) {
1169
1170 LIST_FOREACH(domains, d, l->search_domains) {
1171 r = ordered_set_put(*domains, d->name);
1172 if (r == -EEXIST)
1173 continue;
1174 if (r < 0)
1175 return r;
1176 }
1177 }
1178
1179 return 0;
1180}
c69fa7e3
LP
1181
1182DnssecMode manager_get_dnssec_mode(Manager *m) {
1183 assert(m);
1184
1185 if (m->dnssec_mode != _DNSSEC_MODE_INVALID)
1186 return m->dnssec_mode;
1187
1188 return DNSSEC_NO;
1189}
1190
1191bool manager_dnssec_supported(Manager *m) {
1192 DnsServer *server;
1193 Iterator i;
1194 Link *l;
1195
1196 assert(m);
1197
1198 if (manager_get_dnssec_mode(m) == DNSSEC_NO)
1199 return false;
1200
1201 server = manager_get_dns_server(m);
1202 if (server && !dns_server_dnssec_supported(server))
1203 return false;
1204
1205 HASHMAP_FOREACH(l, m->links, i)
1206 if (!link_dnssec_supported(l))
1207 return false;
1208
1209 return true;
1210}
59c5b597
LP
1211
1212void manager_dnssec_verdict(Manager *m, DnssecVerdict verdict, const DnsResourceKey *key) {
1213
1214 assert(verdict >= 0);
1215 assert(verdict < _DNSSEC_VERDICT_MAX);
1216
1217 if (log_get_max_level() >= LOG_DEBUG) {
1218 _cleanup_free_ char *s = NULL;
1219
1220 (void) dns_resource_key_to_string(key, &s);
1221
1222 log_debug("Found verdict for lookup %s: %s", s ? strstrip(s) : "n/a", dnssec_verdict_to_string(verdict));
1223 }
1224
1225 m->n_dnssec_verdict[verdict]++;
1226}
011696f7
LP
1227
1228bool manager_routable(Manager *m, int family) {
1229 Iterator i;
1230 Link *l;
1231
1232 assert(m);
1233
1234 /* Returns true if the host has at least one interface with a routable address of the specified type */
1235
1236 HASHMAP_FOREACH(l, m->links, i)
1237 if (link_relevant(l, family, false))
1238 return true;
1239
1240 return false;
1241}