Two CODING_STYLE additions
[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 487 m->mdns_support = RESOLVE_SUPPORT_NO;
61ecb465 488 m->dnssec_mode = DEFAULT_DNSSEC_MODE;
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;
4edc2c9b
LP
620 ssize_t ms, l;
621 int r;
74b2466e
LP
622
623 assert(m);
1716f6dc 624 assert(fd >= 0);
74b2466e
LP
625 assert(ret);
626
4edc2c9b 627 ms = next_datagram_size_fd(fd);
74b2466e 628 if (ms < 0)
4edc2c9b 629 return ms;
74b2466e 630
1716f6dc 631 r = dns_packet_new(&p, protocol, ms);
74b2466e
LP
632 if (r < 0)
633 return r;
634
635 iov.iov_base = DNS_PACKET_DATA(p);
636 iov.iov_len = p->allocated;
637
1716f6dc
LP
638 mh.msg_name = &sa.sa;
639 mh.msg_namelen = sizeof(sa);
74b2466e
LP
640 mh.msg_iov = &iov;
641 mh.msg_iovlen = 1;
1716f6dc
LP
642 mh.msg_control = &control;
643 mh.msg_controllen = sizeof(control);
74b2466e 644
a38d9945 645 l = recvmsg(fd, &mh, 0);
f134289a
EV
646 if (l == 0)
647 return 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
1716f6dc
LP
655 assert(!(mh.msg_flags & MSG_CTRUNC));
656 assert(!(mh.msg_flags & MSG_TRUNC));
657
74b2466e 658 p->size = (size_t) l;
091a364c 659
1716f6dc 660 p->family = sa.sa.sa_family;
623a4c97
LP
661 p->ipproto = IPPROTO_UDP;
662 if (p->family == AF_INET) {
1716f6dc 663 p->sender.in = sa.in.sin_addr;
623a4c97
LP
664 p->sender_port = be16toh(sa.in.sin_port);
665 } else if (p->family == AF_INET6) {
1716f6dc 666 p->sender.in6 = sa.in6.sin6_addr;
623a4c97
LP
667 p->sender_port = be16toh(sa.in6.sin6_port);
668 p->ifindex = sa.in6.sin6_scope_id;
669 } else
1716f6dc 670 return -EAFNOSUPPORT;
74b2466e 671
2a1288ff 672 CMSG_FOREACH(cmsg, &mh) {
74b2466e 673
1716f6dc
LP
674 if (cmsg->cmsg_level == IPPROTO_IPV6) {
675 assert(p->family == AF_INET6);
74b2466e 676
1716f6dc 677 switch (cmsg->cmsg_type) {
74b2466e 678
1716f6dc
LP
679 case IPV6_PKTINFO: {
680 struct in6_pktinfo *i = (struct in6_pktinfo*) CMSG_DATA(cmsg);
74b2466e 681
623a4c97
LP
682 if (p->ifindex <= 0)
683 p->ifindex = i->ipi6_ifindex;
684
1716f6dc
LP
685 p->destination.in6 = i->ipi6_addr;
686 break;
687 }
74b2466e 688
1716f6dc
LP
689 case IPV6_HOPLIMIT:
690 p->ttl = *(int *) CMSG_DATA(cmsg);
691 break;
74b2466e 692
1716f6dc
LP
693 }
694 } else if (cmsg->cmsg_level == IPPROTO_IP) {
695 assert(p->family == AF_INET);
74b2466e 696
1716f6dc 697 switch (cmsg->cmsg_type) {
74b2466e 698
1716f6dc
LP
699 case IP_PKTINFO: {
700 struct in_pktinfo *i = (struct in_pktinfo*) CMSG_DATA(cmsg);
091a364c 701
623a4c97
LP
702 if (p->ifindex <= 0)
703 p->ifindex = i->ipi_ifindex;
704
1716f6dc
LP
705 p->destination.in = i->ipi_addr;
706 break;
707 }
74b2466e 708
623a4c97 709 case IP_TTL:
1716f6dc
LP
710 p->ttl = *(int *) CMSG_DATA(cmsg);
711 break;
712 }
713 }
714 }
74b2466e 715
623a4c97
LP
716 /* The Linux kernel sets the interface index to the loopback
717 * device if the packet came from the local host since it
718 * avoids the routing table in such a case. Let's unset the
719 * interface index in such a case. */
a5f03596 720 if (p->ifindex == LOOPBACK_IFINDEX)
623a4c97
LP
721 p->ifindex = 0;
722
86ad4cd7
TG
723 if (protocol != DNS_PROTOCOL_DNS) {
724 /* If we don't know the interface index still, we look for the
725 * first local interface with a matching address. Yuck! */
726 if (p->ifindex <= 0)
727 p->ifindex = manager_find_ifindex(m, p->family, &p->destination);
728 }
623a4c97 729
74b2466e
LP
730 *ret = p;
731 p = NULL;
732
733 return 1;
734}
735
74b2466e
LP
736static int sendmsg_loop(int fd, struct msghdr *mh, int flags) {
737 int r;
738
739 assert(fd >= 0);
740 assert(mh);
741
742 for (;;) {
743 if (sendmsg(fd, mh, flags) >= 0)
744 return 0;
745
746 if (errno == EINTR)
747 continue;
748
749 if (errno != EAGAIN)
750 return -errno;
751
752 r = fd_wait_for_event(fd, POLLOUT, SEND_TIMEOUT_USEC);
753 if (r < 0)
754 return r;
755 if (r == 0)
756 return -ETIMEDOUT;
757 }
758}
759
72290734
TG
760static int write_loop(int fd, void *message, size_t length) {
761 int r;
762
763 assert(fd >= 0);
764 assert(message);
765
766 for (;;) {
767 if (write(fd, message, length) >= 0)
768 return 0;
769
770 if (errno == EINTR)
771 continue;
772
773 if (errno != EAGAIN)
774 return -errno;
775
776 r = fd_wait_for_event(fd, POLLOUT, SEND_TIMEOUT_USEC);
777 if (r < 0)
778 return r;
779 if (r == 0)
780 return -ETIMEDOUT;
781 }
782}
783
784int manager_write(Manager *m, int fd, DnsPacket *p) {
785 int r;
786
deb3f3d3 787 log_debug("Sending %s packet with id %" PRIu16 ".", DNS_PACKET_QR(p) ? "response" : "query", DNS_PACKET_ID(p));
72290734
TG
788
789 r = write_loop(fd, DNS_PACKET_DATA(p), p->size);
790 if (r < 0)
791 return r;
792
793 return 0;
794}
795
623a4c97 796static int manager_ipv4_send(Manager *m, int fd, int ifindex, const struct in_addr *addr, uint16_t port, DnsPacket *p) {
74b2466e
LP
797 union sockaddr_union sa = {
798 .in.sin_family = AF_INET,
74b2466e 799 };
1716f6dc
LP
800 union {
801 struct cmsghdr header; /* For alignment */
802 uint8_t buffer[CMSG_SPACE(sizeof(struct in_pktinfo))];
803 } control;
74b2466e
LP
804 struct msghdr mh = {};
805 struct iovec iov;
74b2466e
LP
806
807 assert(m);
1716f6dc
LP
808 assert(fd >= 0);
809 assert(addr);
810 assert(port > 0);
74b2466e
LP
811 assert(p);
812
74b2466e
LP
813 iov.iov_base = DNS_PACKET_DATA(p);
814 iov.iov_len = p->size;
091a364c 815
1716f6dc
LP
816 sa.in.sin_addr = *addr;
817 sa.in.sin_port = htobe16(port),
091a364c 818
74b2466e
LP
819 mh.msg_iov = &iov;
820 mh.msg_iovlen = 1;
821 mh.msg_name = &sa.sa;
822 mh.msg_namelen = sizeof(sa.in);
091a364c 823
74b2466e
LP
824 if (ifindex > 0) {
825 struct cmsghdr *cmsg;
826 struct in_pktinfo *pi;
827
828 zero(control);
829
1716f6dc 830 mh.msg_control = &control;
74b2466e
LP
831 mh.msg_controllen = CMSG_LEN(sizeof(struct in_pktinfo));
832
833 cmsg = CMSG_FIRSTHDR(&mh);
834 cmsg->cmsg_len = mh.msg_controllen;
835 cmsg->cmsg_level = IPPROTO_IP;
836 cmsg->cmsg_type = IP_PKTINFO;
837
838 pi = (struct in_pktinfo*) CMSG_DATA(cmsg);
839 pi->ipi_ifindex = ifindex;
840 }
841
842 return sendmsg_loop(fd, &mh, 0);
843}
844
623a4c97 845static int manager_ipv6_send(Manager *m, int fd, int ifindex, const struct in6_addr *addr, uint16_t port, DnsPacket *p) {
74b2466e
LP
846 union sockaddr_union sa = {
847 .in6.sin6_family = AF_INET6,
74b2466e 848 };
1716f6dc
LP
849 union {
850 struct cmsghdr header; /* For alignment */
851 uint8_t buffer[CMSG_SPACE(sizeof(struct in6_pktinfo))];
852 } control;
74b2466e
LP
853 struct msghdr mh = {};
854 struct iovec iov;
74b2466e
LP
855
856 assert(m);
1716f6dc
LP
857 assert(fd >= 0);
858 assert(addr);
859 assert(port > 0);
74b2466e
LP
860 assert(p);
861
74b2466e
LP
862 iov.iov_base = DNS_PACKET_DATA(p);
863 iov.iov_len = p->size;
864
1716f6dc
LP
865 sa.in6.sin6_addr = *addr;
866 sa.in6.sin6_port = htobe16(port),
74b2466e
LP
867 sa.in6.sin6_scope_id = ifindex;
868
869 mh.msg_iov = &iov;
870 mh.msg_iovlen = 1;
871 mh.msg_name = &sa.sa;
872 mh.msg_namelen = sizeof(sa.in6);
873
874 if (ifindex > 0) {
875 struct cmsghdr *cmsg;
876 struct in6_pktinfo *pi;
877
878 zero(control);
879
1716f6dc 880 mh.msg_control = &control;
74b2466e
LP
881 mh.msg_controllen = CMSG_LEN(sizeof(struct in6_pktinfo));
882
883 cmsg = CMSG_FIRSTHDR(&mh);
884 cmsg->cmsg_len = mh.msg_controllen;
885 cmsg->cmsg_level = IPPROTO_IPV6;
886 cmsg->cmsg_type = IPV6_PKTINFO;
887
888 pi = (struct in6_pktinfo*) CMSG_DATA(cmsg);
889 pi->ipi6_ifindex = ifindex;
890 }
891
892 return sendmsg_loop(fd, &mh, 0);
893}
894
623a4c97 895int manager_send(Manager *m, int fd, int ifindex, int family, const union in_addr_union *addr, uint16_t port, DnsPacket *p) {
1716f6dc
LP
896 assert(m);
897 assert(fd >= 0);
898 assert(addr);
899 assert(port > 0);
900 assert(p);
901
deb3f3d3 902 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 903
1716f6dc
LP
904 if (family == AF_INET)
905 return manager_ipv4_send(m, fd, ifindex, &addr->in, port, p);
906 else if (family == AF_INET6)
907 return manager_ipv6_send(m, fd, ifindex, &addr->in6, port, p);
908
909 return -EAFNOSUPPORT;
910}
911
e1c95994
LP
912uint32_t manager_find_mtu(Manager *m) {
913 uint32_t mtu = 0;
914 Link *l;
915 Iterator i;
916
917 /* If we don't know on which link a DNS packet would be
918 * delivered, let's find the largest MTU that works on all
919 * interfaces we know of */
920
921 HASHMAP_FOREACH(l, m->links, i) {
922 if (l->mtu <= 0)
923 continue;
924
925 if (mtu <= 0 || l->mtu < mtu)
926 mtu = l->mtu;
927 }
928
929 return mtu;
930}
1716f6dc 931
623a4c97 932int manager_find_ifindex(Manager *m, int family, const union in_addr_union *in_addr) {
ec2c5e43
LP
933 LinkAddress *a;
934
935 assert(m);
936
4e945a6f 937 a = manager_find_link_address(m, family, in_addr);
ec2c5e43
LP
938 if (a)
939 return a->link->ifindex;
940
941 return 0;
942}
943
eb60f9cd
LP
944void manager_refresh_rrs(Manager *m) {
945 Iterator i;
946 Link *l;
947
948 assert(m);
949
78c6a153
LP
950 m->llmnr_host_ipv4_key = dns_resource_key_unref(m->llmnr_host_ipv4_key);
951 m->llmnr_host_ipv6_key = dns_resource_key_unref(m->llmnr_host_ipv6_key);
eb60f9cd
LP
952
953 HASHMAP_FOREACH(l, m->links, i) {
954 link_add_rrs(l, true);
955 link_add_rrs(l, false);
956 }
957}
958
ec2c5e43
LP
959int manager_next_hostname(Manager *m) {
960 const char *p;
556a2294 961 uint64_t u, a;
78c6a153
LP
962 char *h, *k;
963 int r;
623a4c97
LP
964
965 assert(m);
966
78c6a153 967 p = strchr(m->llmnr_hostname, 0);
ec2c5e43
LP
968 assert(p);
969
78c6a153 970 while (p > m->llmnr_hostname) {
ec2c5e43
LP
971 if (!strchr("0123456789", p[-1]))
972 break;
973
974 p--;
975 }
976
977 if (*p == 0 || safe_atou64(p, &u) < 0 || u <= 0)
978 u = 1;
979
556a2294
LP
980 /* Add a random number to the old value. This way we can avoid
981 * that two hosts pick the same hostname, win on IPv4 and lose
982 * on IPv6 (or vice versa), and pick the same hostname
983 * replacement hostname, ad infinitum. We still want the
984 * numbers to go up monotonically, hence we just add a random
985 * value 1..10 */
986
987 random_bytes(&a, sizeof(a));
988 u += 1 + a % 10;
ec2c5e43 989
78c6a153 990 if (asprintf(&h, "%.*s%" PRIu64, (int) (p - m->llmnr_hostname), m->llmnr_hostname, u) < 0)
ec2c5e43
LP
991 return -ENOMEM;
992
78c6a153
LP
993 r = dns_name_concat(h, "local", &k);
994 if (r < 0) {
995 free(h);
996 return r;
997 }
998
999 log_info("Hostname conflict, changing published hostname from '%s' to '%s'.", m->llmnr_hostname, h);
1000
1001 free(m->llmnr_hostname);
1002 m->llmnr_hostname = h;
ec2c5e43 1003
78c6a153
LP
1004 free(m->mdns_hostname);
1005 m->mdns_hostname = k;
ec2c5e43 1006
eb60f9cd 1007 manager_refresh_rrs(m);
623a4c97
LP
1008
1009 return 0;
1010}
ec2c5e43 1011
4e945a6f 1012LinkAddress* manager_find_link_address(Manager *m, int family, const union in_addr_union *in_addr) {
ec2c5e43
LP
1013 Iterator i;
1014 Link *l;
1015
1016 assert(m);
1017
1018 HASHMAP_FOREACH(l, m->links, i) {
1019 LinkAddress *a;
1020
1021 a = link_find_address(l, family, in_addr);
1022 if (a)
1023 return a;
1024 }
1025
1026 return NULL;
1027}
1028
a4076574 1029bool manager_our_packet(Manager *m, DnsPacket *p) {
ec2c5e43
LP
1030 assert(m);
1031 assert(p);
1032
4e945a6f 1033 return !!manager_find_link_address(m, p->family, &p->sender);
ec2c5e43 1034}
4e945a6f 1035
a4076574
LP
1036DnsScope* manager_find_scope(Manager *m, DnsPacket *p) {
1037 Link *l;
1038
1039 assert(m);
1040 assert(p);
1041
1042 l = hashmap_get(m->links, INT_TO_PTR(p->ifindex));
1043 if (!l)
1044 return NULL;
1045
b4f1862d
DM
1046 switch (p->protocol) {
1047 case DNS_PROTOCOL_LLMNR:
a4076574
LP
1048 if (p->family == AF_INET)
1049 return l->llmnr_ipv4_scope;
1050 else if (p->family == AF_INET6)
1051 return l->llmnr_ipv6_scope;
b4f1862d
DM
1052
1053 break;
1054
1055 case DNS_PROTOCOL_MDNS:
1056 if (p->family == AF_INET)
1057 return l->mdns_ipv4_scope;
1058 else if (p->family == AF_INET6)
1059 return l->mdns_ipv6_scope;
1060
1061 break;
1062
1063 default:
1064 break;
a4076574
LP
1065 }
1066
1067 return NULL;
1068}
1069
902bb5d8
LP
1070void manager_verify_all(Manager *m) {
1071 DnsScope *s;
1072
1073 assert(m);
1074
1075 LIST_FOREACH(scopes, s, m->dns_scopes)
1076 dns_zone_verify_all(&s->zone);
1077}
1078
78c6a153 1079int manager_is_own_hostname(Manager *m, const char *name) {
78c6a153
LP
1080 int r;
1081
1082 assert(m);
1083 assert(name);
1084
1085 if (m->llmnr_hostname) {
1086 r = dns_name_equal(name, m->llmnr_hostname);
1087 if (r != 0)
1088 return r;
1089 }
1090
1091 if (m->mdns_hostname)
1092 return dns_name_equal(name, m->mdns_hostname);
1093
1094 return 0;
1095}
1096
9176a57c
LP
1097int manager_compile_dns_servers(Manager *m, OrderedSet **dns) {
1098 DnsServer *s;
1099 Iterator i;
1100 Link *l;
1101 int r;
1102
1103 assert(m);
1104 assert(dns);
1105
1106 r = ordered_set_ensure_allocated(dns, &dns_server_hash_ops);
1107 if (r < 0)
1108 return r;
1109
1110 /* First add the system-wide servers and domains */
1111 LIST_FOREACH(servers, s, m->dns_servers) {
1112 r = ordered_set_put(*dns, s);
1113 if (r == -EEXIST)
1114 continue;
1115 if (r < 0)
1116 return r;
1117 }
1118
1119 /* Then, add the per-link servers */
1120 HASHMAP_FOREACH(l, m->links, i) {
1121 LIST_FOREACH(servers, s, l->dns_servers) {
1122 r = ordered_set_put(*dns, s);
1123 if (r == -EEXIST)
1124 continue;
1125 if (r < 0)
1126 return r;
1127 }
1128 }
1129
1130 /* If we found nothing, add the fallback servers */
1131 if (ordered_set_isempty(*dns)) {
1132 LIST_FOREACH(servers, s, m->fallback_dns_servers) {
1133 r = ordered_set_put(*dns, s);
1134 if (r == -EEXIST)
1135 continue;
1136 if (r < 0)
1137 return r;
1138 }
1139 }
1140
1141 return 0;
1142}
1143
1144int manager_compile_search_domains(Manager *m, OrderedSet **domains) {
1145 DnsSearchDomain *d;
1146 Iterator i;
1147 Link *l;
1148 int r;
1149
1150 assert(m);
1151 assert(domains);
1152
1153 r = ordered_set_ensure_allocated(domains, &dns_name_hash_ops);
1154 if (r < 0)
1155 return r;
1156
1157 LIST_FOREACH(domains, d, m->search_domains) {
1158 r = ordered_set_put(*domains, d->name);
1159 if (r == -EEXIST)
1160 continue;
1161 if (r < 0)
1162 return r;
1163 }
1164
1165 HASHMAP_FOREACH(l, m->links, i) {
1166
1167 LIST_FOREACH(domains, d, l->search_domains) {
1168 r = ordered_set_put(*domains, d->name);
1169 if (r == -EEXIST)
1170 continue;
1171 if (r < 0)
1172 return r;
1173 }
1174 }
1175
1176 return 0;
1177}
c69fa7e3
LP
1178
1179DnssecMode manager_get_dnssec_mode(Manager *m) {
1180 assert(m);
1181
1182 if (m->dnssec_mode != _DNSSEC_MODE_INVALID)
1183 return m->dnssec_mode;
1184
1185 return DNSSEC_NO;
1186}
1187
1188bool manager_dnssec_supported(Manager *m) {
1189 DnsServer *server;
1190 Iterator i;
1191 Link *l;
1192
1193 assert(m);
1194
1195 if (manager_get_dnssec_mode(m) == DNSSEC_NO)
1196 return false;
1197
1198 server = manager_get_dns_server(m);
1199 if (server && !dns_server_dnssec_supported(server))
1200 return false;
1201
1202 HASHMAP_FOREACH(l, m->links, i)
1203 if (!link_dnssec_supported(l))
1204 return false;
1205
1206 return true;
1207}
59c5b597
LP
1208
1209void manager_dnssec_verdict(Manager *m, DnssecVerdict verdict, const DnsResourceKey *key) {
1210
1211 assert(verdict >= 0);
1212 assert(verdict < _DNSSEC_VERDICT_MAX);
1213
1214 if (log_get_max_level() >= LOG_DEBUG) {
202b76ae 1215 char s[DNS_RESOURCE_KEY_STRING_MAX];
59c5b597 1216
202b76ae
ZJS
1217 log_debug("Found verdict for lookup %s: %s",
1218 dns_resource_key_to_string(key, s, sizeof s),
1219 dnssec_verdict_to_string(verdict));
59c5b597
LP
1220 }
1221
1222 m->n_dnssec_verdict[verdict]++;
1223}
011696f7
LP
1224
1225bool manager_routable(Manager *m, int family) {
1226 Iterator i;
1227 Link *l;
1228
1229 assert(m);
1230
1231 /* Returns true if the host has at least one interface with a routable address of the specified type */
1232
1233 HASHMAP_FOREACH(l, m->links, i)
1234 if (link_relevant(l, family, false))
1235 return true;
1236
1237 return false;
1238}