1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
2
3 #include "alloc-util.h"
4 #include "bus-common-errors.h"
5 #include "bus-get-properties.h"
6 #include "bus-log-control-api.h"
7 #include "bus-message-util.h"
8 #include "bus-polkit.h"
9 #include "dns-domain.h"
10 #include "format-util.h"
11 #include "memory-util.h"
12 #include "missing_capability.h"
13 #include "resolved-bus.h"
14 #include "resolved-def.h"
15 #include "resolved-dns-synthesize.h"
16 #include "resolved-dnssd-bus.h"
17 #include "resolved-dnssd.h"
18 #include "resolved-link-bus.h"
19 #include "resolved-resolv-conf.h"
20 #include "socket-netlink.h"
21 #include "stdio-util.h"
22 #include "strv.h"
23 #include "syslog-util.h"
24 #include "user-util.h"
25 #include "utf8.h"
26
27 BUS_DEFINE_PROPERTY_GET_ENUM(bus_property_get_resolve_support, resolve_support, ResolveSupport);
28
query_on_bus_track(sd_bus_track * t,void * userdata)29 static int query_on_bus_track(sd_bus_track *t, void *userdata) {
30 DnsQuery *q = userdata;
31
32 assert(t);
33 assert(q);
34
35 if (!DNS_TRANSACTION_IS_LIVE(q->state))
36 return 0;
37
38 log_debug("Client of active query vanished, aborting query.");
39 dns_query_complete(q, DNS_TRANSACTION_ABORTED);
40 return 0;
41 }
42
dns_query_bus_track(DnsQuery * q,sd_bus_message * m)43 static int dns_query_bus_track(DnsQuery *q, sd_bus_message *m) {
44 int r;
45
46 assert(q);
47 assert(m);
48
49 if (!q->bus_track) {
50 r = sd_bus_track_new(sd_bus_message_get_bus(m), &q->bus_track, query_on_bus_track, q);
51 if (r < 0)
52 return r;
53 }
54
55 r = sd_bus_track_add_sender(q->bus_track, m);
56 if (r < 0)
57 return r;
58
59 return 0;
60 }
61
dns_query_steal_request(DnsQuery * q)62 static sd_bus_message *dns_query_steal_request(DnsQuery *q) {
63 assert(q);
64
65 /* Find the main query, it's the one that owns the message */
66 while (q->auxiliary_for)
67 q = q->auxiliary_for;
68
69 /* Let's take the request message out of the DnsQuery object, so that we never send requests twice */
70 return TAKE_PTR(q->bus_request);
71 }
72
reply_method_errorf(DnsQuery * query,const char * error_name,const char * format,...)73 _sd_printf_(3, 4) static int reply_method_errorf(
74 DnsQuery *query,
75 const char *error_name,
76 const char *format,
77 ...) {
78
79 _cleanup_(sd_bus_message_unrefp) sd_bus_message *req = NULL;
80 va_list ap;
81 int r;
82
83 assert(query);
84 assert(format);
85
86 req = dns_query_steal_request(query);
87 if (!req) /* No bus message set anymore? then we already replied already, let's not answer a second time */
88 return 0;
89
90 va_start(ap, format);
91 r = sd_bus_reply_method_errorfv(req, error_name, format, ap);
92 va_end(ap);
93
94 return r;
95 }
96
reply_method_errnof(DnsQuery * query,int err,const char * format,...)97 _sd_printf_(3, 4) static int reply_method_errnof(
98 DnsQuery *query,
99 int err,
100 const char *format,
101 ...) {
102
103 _cleanup_(sd_bus_message_unrefp) sd_bus_message *req = NULL;
104 int r;
105
106 assert(query);
107
108 req = dns_query_steal_request(query);
109 if (!req) /* No bus message set anymore? then we already replied already, let's not answer a second time */
110 return 0;
111
112 if (format) {
113 va_list ap;
114
115 va_start(ap, format);
116 r = sd_bus_reply_method_errnofv(req, err, format, ap);
117 va_end(ap);
118 } else
119 r = sd_bus_reply_method_errno(req, err, NULL);
120
121 return r;
122 }
123
reply_query_state(DnsQuery * q)124 static int reply_query_state(DnsQuery *q) {
125 assert(q);
126
127 switch (q->state) {
128
129 case DNS_TRANSACTION_NO_SERVERS:
130 return reply_method_errorf(q, BUS_ERROR_NO_NAME_SERVERS, "No appropriate name servers or networks for name found");
131
132 case DNS_TRANSACTION_TIMEOUT:
133 return reply_method_errorf(q, SD_BUS_ERROR_TIMEOUT, "Query timed out");
134
135 case DNS_TRANSACTION_ATTEMPTS_MAX_REACHED:
136 return reply_method_errorf(q, SD_BUS_ERROR_TIMEOUT, "All attempts to contact name servers or networks failed");
137
138 case DNS_TRANSACTION_INVALID_REPLY:
139 return reply_method_errorf(q, BUS_ERROR_INVALID_REPLY, "Received invalid reply");
140
141 case DNS_TRANSACTION_ERRNO:
142 return reply_method_errnof(q, q->answer_errno, "Lookup failed due to system error: %m");
143
144 case DNS_TRANSACTION_ABORTED:
145 return reply_method_errorf(q, BUS_ERROR_ABORTED, "Query aborted");
146
147 case DNS_TRANSACTION_DNSSEC_FAILED:
148 return reply_method_errorf(q, BUS_ERROR_DNSSEC_FAILED, "DNSSEC validation failed: %s",
149 dnssec_result_to_string(q->answer_dnssec_result));
150
151 case DNS_TRANSACTION_NO_TRUST_ANCHOR:
152 return reply_method_errorf(q, BUS_ERROR_NO_TRUST_ANCHOR, "No suitable trust anchor known");
153
154 case DNS_TRANSACTION_RR_TYPE_UNSUPPORTED:
155 return reply_method_errorf(q, BUS_ERROR_RR_TYPE_UNSUPPORTED, "Server does not support requested resource record type");
156
157 case DNS_TRANSACTION_NETWORK_DOWN:
158 return reply_method_errorf(q, BUS_ERROR_NETWORK_DOWN, "Network is down");
159
160 case DNS_TRANSACTION_NOT_FOUND:
161 /* We return this as NXDOMAIN. This is only generated when a host doesn't implement LLMNR/TCP, and we
162 * thus quickly know that we cannot resolve an in-addr.arpa or ip6.arpa address. */
163 return reply_method_errorf(q, _BUS_ERROR_DNS "NXDOMAIN", "'%s' not found", dns_query_string(q));
164
165 case DNS_TRANSACTION_NO_SOURCE:
166 return reply_method_errorf(q, BUS_ERROR_NO_SOURCE, "All suitable resolution sources turned off");
167
168 case DNS_TRANSACTION_STUB_LOOP:
169 return reply_method_errorf(q, BUS_ERROR_STUB_LOOP, "Configured DNS server loops back to us");
170
171 case DNS_TRANSACTION_RCODE_FAILURE: {
172 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
173 _cleanup_(sd_bus_message_unrefp) sd_bus_message *req = NULL;
174
175 req = dns_query_steal_request(q);
176 if (!req) /* No bus message set anymore? then we already replied already, let's not answer a second time */
177 return 0;
178
179 if (q->answer_rcode == DNS_RCODE_NXDOMAIN)
180 sd_bus_error_setf(&error, _BUS_ERROR_DNS "NXDOMAIN", "'%s' not found", dns_query_string(q));
181 else {
182 const char *rc, *n;
183 char p[DECIMAL_STR_MAX(q->answer_rcode)];
184
185 rc = dns_rcode_to_string(q->answer_rcode);
186 if (!rc) {
187 xsprintf(p, "%i", q->answer_rcode);
188 rc = p;
189 }
190
191 n = strjoina(_BUS_ERROR_DNS, rc);
192 sd_bus_error_setf(&error, n, "Could not resolve '%s', server or network returned error %s", dns_query_string(q), rc);
193 }
194
195 return sd_bus_reply_method_error(req, &error);
196 }
197
198 case DNS_TRANSACTION_NULL:
199 case DNS_TRANSACTION_PENDING:
200 case DNS_TRANSACTION_VALIDATING:
201 case DNS_TRANSACTION_SUCCESS:
202 default:
203 assert_not_reached();
204 }
205 }
206
append_address(sd_bus_message * reply,DnsResourceRecord * rr,int ifindex)207 static int append_address(sd_bus_message *reply, DnsResourceRecord *rr, int ifindex) {
208 int r;
209
210 assert(reply);
211 assert(rr);
212
213 r = sd_bus_message_open_container(reply, 'r', "iiay");
214 if (r < 0)
215 return r;
216
217 r = sd_bus_message_append(reply, "i", ifindex);
218 if (r < 0)
219 return r;
220
221 if (rr->key->type == DNS_TYPE_A) {
222 r = sd_bus_message_append(reply, "i", AF_INET);
223 if (r < 0)
224 return r;
225
226 r = sd_bus_message_append_array(reply, 'y', &rr->a.in_addr, sizeof(struct in_addr));
227
228 } else if (rr->key->type == DNS_TYPE_AAAA) {
229 r = sd_bus_message_append(reply, "i", AF_INET6);
230 if (r < 0)
231 return r;
232
233 r = sd_bus_message_append_array(reply, 'y', &rr->aaaa.in6_addr, sizeof(struct in6_addr));
234 } else
235 return -EAFNOSUPPORT;
236
237 if (r < 0)
238 return r;
239
240 r = sd_bus_message_close_container(reply);
241 if (r < 0)
242 return r;
243
244 return 0;
245 }
246
bus_method_resolve_hostname_complete(DnsQuery * query)247 static void bus_method_resolve_hostname_complete(DnsQuery *query) {
248 _cleanup_(dns_resource_record_unrefp) DnsResourceRecord *canonical = NULL;
249 _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
250 _cleanup_(dns_query_freep) DnsQuery *q = query;
251 _cleanup_free_ char *normalized = NULL;
252 DnsQuestion *question;
253 DnsResourceRecord *rr;
254 unsigned added = 0;
255 int ifindex, r;
256
257 assert(q);
258
259 if (q->state != DNS_TRANSACTION_SUCCESS) {
260 r = reply_query_state(q);
261 goto finish;
262 }
263
264 r = dns_query_process_cname_many(q);
265 if (r == -ELOOP) {
266 r = reply_method_errorf(q, BUS_ERROR_CNAME_LOOP, "CNAME loop detected, or CNAME resolving disabled on '%s'", dns_query_string(q));
267 goto finish;
268 }
269 if (r < 0)
270 goto finish;
271 if (r == DNS_QUERY_CNAME) {
272 /* This was a cname, and the query was restarted. */
273 TAKE_PTR(q);
274 return;
275 }
276
277 r = sd_bus_message_new_method_return(q->bus_request, &reply);
278 if (r < 0)
279 goto finish;
280
281 r = sd_bus_message_open_container(reply, 'a', "(iiay)");
282 if (r < 0)
283 goto finish;
284
285 question = dns_query_question_for_protocol(q, q->answer_protocol);
286
287 DNS_ANSWER_FOREACH_IFINDEX(rr, ifindex, q->answer) {
288
289 r = dns_question_matches_rr(question, rr, DNS_SEARCH_DOMAIN_NAME(q->answer_search_domain));
290 if (r < 0)
291 goto finish;
292 if (r == 0)
293 continue;
294
295 r = append_address(reply, rr, ifindex);
296 if (r < 0)
297 goto finish;
298
299 if (!canonical)
300 canonical = dns_resource_record_ref(rr);
301
302 added++;
303 }
304
305 if (added <= 0) {
306 r = reply_method_errorf(q, BUS_ERROR_NO_SUCH_RR, "'%s' does not have any RR of the requested type", dns_query_string(q));
307 goto finish;
308 }
309
310 r = sd_bus_message_close_container(reply);
311 if (r < 0)
312 goto finish;
313
314 /* The key names are not necessarily normalized, make sure that they are when we return them to our
315 * bus clients. */
316 assert(canonical);
317 r = dns_name_normalize(dns_resource_key_name(canonical->key), 0, &normalized);
318 if (r < 0)
319 goto finish;
320
321 /* Return the precise spelling and uppercasing and CNAME target reported by the server */
322 r = sd_bus_message_append(
323 reply, "st",
324 normalized,
325 dns_query_reply_flags_make(q));
326 if (r < 0)
327 goto finish;
328
329 q->bus_request = sd_bus_message_unref(q->bus_request);
330 r = sd_bus_send(q->manager->bus, reply, NULL);
331
332 finish:
333 if (r < 0) {
334 log_error_errno(r, "Failed to send hostname reply: %m");
335 (void) reply_method_errnof(q, r, NULL);
336 }
337 }
338
validate_and_mangle_flags(const char * name,uint64_t * flags,uint64_t ok,sd_bus_error * error)339 static int validate_and_mangle_flags(
340 const char *name,
341 uint64_t *flags,
342 uint64_t ok,
343 sd_bus_error *error) {
344
345 assert(flags);
346
347 /* Checks that the client supplied interface index and flags parameter actually are valid and make
348 * sense in our method call context. Specifically:
349 *
350 * 1. Checks that the interface index is either 0 (meaning *all* interfaces) or positive
351 *
352 * 2. Only the protocols flags and a bunch of NO_XYZ flags are set, at most. Plus additional flags
353 * specific to our method, passed in the "ok" parameter.
354 *
355 * 3. If zero protocol flags are specified it is automatically turned into *all* protocols. This way
356 * clients can simply pass 0 as flags and all will work as it should. They can also use this so
357 * that clients don't have to know all the protocols resolved implements, but can just specify 0
358 * to mean "all supported protocols".
359 */
360
361 if (*flags & ~(SD_RESOLVED_PROTOCOLS_ALL|
362 SD_RESOLVED_NO_CNAME|
363 SD_RESOLVED_NO_VALIDATE|
364 SD_RESOLVED_NO_SYNTHESIZE|
365 SD_RESOLVED_NO_CACHE|
366 SD_RESOLVED_NO_ZONE|
367 SD_RESOLVED_NO_TRUST_ANCHOR|
368 SD_RESOLVED_NO_NETWORK|
369 ok))
370 return sd_bus_error_set(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid flags parameter");
371
372 if ((*flags & SD_RESOLVED_PROTOCOLS_ALL) == 0) /* If no protocol is enabled, enable all */
373 *flags |= SD_RESOLVED_PROTOCOLS_ALL;
374
375 /* Imply SD_RESOLVED_NO_SEARCH if permitted and name is dot suffixed. */
376 if (name && FLAGS_SET(ok, SD_RESOLVED_NO_SEARCH) && dns_name_dot_suffixed(name) > 0)
377 *flags |= SD_RESOLVED_NO_SEARCH;
378
379 return 0;
380 }
381
parse_as_address(sd_bus_message * m,int ifindex,const char * hostname,int family,uint64_t flags)382 static int parse_as_address(sd_bus_message *m, int ifindex, const char *hostname, int family, uint64_t flags) {
383 _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
384 _cleanup_free_ char *canonical = NULL;
385 union in_addr_union parsed;
386 int r, ff, parsed_ifindex = 0;
387
388 /* Check if the hostname is actually already an IP address formatted as string. In that case just parse it,
389 * let's not attempt to look it up. */
390
391 r = in_addr_ifindex_from_string_auto(hostname, &ff, &parsed, &parsed_ifindex);
392 if (r < 0) /* not an address */
393 return 0;
394
395 if (family != AF_UNSPEC && ff != family)
396 return sd_bus_reply_method_errorf(m, BUS_ERROR_NO_SUCH_RR, "The specified address is not of the requested family.");
397 if (ifindex > 0 && parsed_ifindex > 0 && parsed_ifindex != ifindex)
398 return sd_bus_reply_method_errorf(m, BUS_ERROR_NO_SUCH_RR, "The specified address interface index does not match requested interface.");
399
400 if (parsed_ifindex > 0)
401 ifindex = parsed_ifindex;
402
403 r = sd_bus_message_new_method_return(m, &reply);
404 if (r < 0)
405 return r;
406
407 r = sd_bus_message_open_container(reply, 'a', "(iiay)");
408 if (r < 0)
409 return r;
410
411 r = sd_bus_message_open_container(reply, 'r', "iiay");
412 if (r < 0)
413 return r;
414
415 r = sd_bus_message_append(reply, "ii", ifindex, ff);
416 if (r < 0)
417 return r;
418
419 r = sd_bus_message_append_array(reply, 'y', &parsed, FAMILY_ADDRESS_SIZE(ff));
420 if (r < 0)
421 return r;
422
423 r = sd_bus_message_close_container(reply);
424 if (r < 0)
425 return r;
426
427 r = sd_bus_message_close_container(reply);
428 if (r < 0)
429 return r;
430
431 /* When an IP address is specified we just return it as canonical name, in order to avoid a DNS
432 * look-up. However, we reformat it to make sure it's in a truly canonical form (i.e. on IPv6 the inner
433 * omissions are always done the same way). */
434 r = in_addr_ifindex_to_string(ff, &parsed, ifindex, &canonical);
435 if (r < 0)
436 return r;
437
438 r = sd_bus_message_append(reply, "st", canonical,
439 SD_RESOLVED_FLAGS_MAKE(dns_synthesize_protocol(flags), ff, true, true) |
440 SD_RESOLVED_SYNTHETIC);
441 if (r < 0)
442 return r;
443
444 return sd_bus_send(sd_bus_message_get_bus(m), reply, NULL);
445 }
446
bus_client_log(sd_bus_message * m,const char * what)447 void bus_client_log(sd_bus_message *m, const char *what) {
448 _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
449 const char *comm = NULL;
450 uid_t uid = UID_INVALID;
451 pid_t pid = 0;
452 int r;
453
454 assert(m);
455 assert(what);
456
457 if (!DEBUG_LOGGING)
458 return;
459
460 r = sd_bus_query_sender_creds(m, SD_BUS_CREDS_PID|SD_BUS_CREDS_UID|SD_BUS_CREDS_COMM|SD_BUS_CREDS_AUGMENT, &creds);
461 if (r < 0)
462 return (void) log_debug_errno(r, "Failed to query client credentials, ignoring: %m");
463
464 (void) sd_bus_creds_get_uid(creds, &uid);
465 (void) sd_bus_creds_get_pid(creds, &pid);
466 (void) sd_bus_creds_get_comm(creds, &comm);
467
468 log_debug("D-Bus %s request from client PID " PID_FMT " (%s) with UID " UID_FMT,
469 what, pid, strna(comm), uid);
470 }
471
bus_method_resolve_hostname(sd_bus_message * message,void * userdata,sd_bus_error * error)472 static int bus_method_resolve_hostname(sd_bus_message *message, void *userdata, sd_bus_error *error) {
473 _cleanup_(dns_question_unrefp) DnsQuestion *question_idna = NULL, *question_utf8 = NULL;
474 _cleanup_(dns_query_freep) DnsQuery *q = NULL;
475 Manager *m = userdata;
476 const char *hostname;
477 int family, ifindex;
478 uint64_t flags;
479 int r;
480
481 assert(message);
482 assert(m);
483
484 assert_cc(sizeof(int) == sizeof(int32_t));
485
486 r = sd_bus_message_read(message, "isit", &ifindex, &hostname, &family, &flags);
487 if (r < 0)
488 return r;
489
490 if (ifindex < 0)
491 return sd_bus_error_set(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid interface index");
492
493 if (!IN_SET(family, AF_INET, AF_INET6, AF_UNSPEC))
494 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Unknown address family %i", family);
495
496 r = validate_and_mangle_flags(hostname, &flags, SD_RESOLVED_NO_SEARCH, error);
497 if (r < 0)
498 return r;
499
500 r = parse_as_address(message, ifindex, hostname, family, flags);
501 if (r != 0)
502 return r;
503
504 r = dns_name_is_valid(hostname);
505 if (r < 0)
506 return r;
507 if (r == 0)
508 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid hostname '%s'", hostname);
509
510 r = dns_question_new_address(&question_utf8, family, hostname, false);
511 if (r < 0)
512 return r;
513
514 r = dns_question_new_address(&question_idna, family, hostname, true);
515 if (r < 0 && r != -EALREADY)
516 return r;
517
518 bus_client_log(message, "hostname resolution");
519
520 r = dns_query_new(m, &q, question_utf8, question_idna ?: question_utf8, NULL, ifindex, flags);
521 if (r < 0)
522 return r;
523
524 q->bus_request = sd_bus_message_ref(message);
525 q->request_family = family;
526 q->complete = bus_method_resolve_hostname_complete;
527
528 r = dns_query_bus_track(q, message);
529 if (r < 0)
530 return r;
531
532 r = dns_query_go(q);
533 if (r < 0)
534 return r;
535
536 TAKE_PTR(q);
537 return 1;
538 }
539
bus_method_resolve_address_complete(DnsQuery * query)540 static void bus_method_resolve_address_complete(DnsQuery *query) {
541 _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
542 _cleanup_(dns_query_freep) DnsQuery *q = query;
543 DnsQuestion *question;
544 DnsResourceRecord *rr;
545 unsigned added = 0;
546 int ifindex, r;
547
548 assert(q);
549
550 if (q->state != DNS_TRANSACTION_SUCCESS) {
551 r = reply_query_state(q);
552 goto finish;
553 }
554
555 r = dns_query_process_cname_many(q);
556 if (r == -ELOOP) {
557 r = reply_method_errorf(q, BUS_ERROR_CNAME_LOOP, "CNAME loop detected, or CNAME resolving disabled on '%s'", dns_query_string(q));
558 goto finish;
559 }
560 if (r < 0)
561 goto finish;
562 if (r == DNS_QUERY_CNAME) {
563 /* This was a cname, and the query was restarted. */
564 TAKE_PTR(q);
565 return;
566 }
567
568 r = sd_bus_message_new_method_return(q->bus_request, &reply);
569 if (r < 0)
570 goto finish;
571
572 r = sd_bus_message_open_container(reply, 'a', "(is)");
573 if (r < 0)
574 goto finish;
575
576 question = dns_query_question_for_protocol(q, q->answer_protocol);
577
578 DNS_ANSWER_FOREACH_IFINDEX(rr, ifindex, q->answer) {
579 _cleanup_free_ char *normalized = NULL;
580
581 r = dns_question_matches_rr(question, rr, NULL);
582 if (r < 0)
583 goto finish;
584 if (r == 0)
585 continue;
586
587 r = dns_name_normalize(rr->ptr.name, 0, &normalized);
588 if (r < 0)
589 goto finish;
590
591 r = sd_bus_message_append(reply, "(is)", ifindex, normalized);
592 if (r < 0)
593 goto finish;
594
595 added++;
596 }
597
598 if (added <= 0) {
599 _cleanup_free_ char *ip = NULL;
600
601 (void) in_addr_to_string(q->request_family, &q->request_address, &ip);
602 r = reply_method_errorf(q, BUS_ERROR_NO_SUCH_RR,
603 "Address '%s' does not have any RR of requested type", strnull(ip));
604 goto finish;
605 }
606
607 r = sd_bus_message_close_container(reply);
608 if (r < 0)
609 goto finish;
610
611 r = sd_bus_message_append(reply, "t", dns_query_reply_flags_make(q));
612 if (r < 0)
613 goto finish;
614
615 q->bus_request = sd_bus_message_unref(q->bus_request);
616 r = sd_bus_send(q->manager->bus, reply, NULL);
617
618 finish:
619 if (r < 0) {
620 log_error_errno(r, "Failed to send address reply: %m");
621 (void) reply_method_errnof(q, r, NULL);
622 }
623 }
624
bus_method_resolve_address(sd_bus_message * message,void * userdata,sd_bus_error * error)625 static int bus_method_resolve_address(sd_bus_message *message, void *userdata, sd_bus_error *error) {
626 _cleanup_(dns_question_unrefp) DnsQuestion *question = NULL;
627 _cleanup_(dns_query_freep) DnsQuery *q = NULL;
628 Manager *m = userdata;
629 union in_addr_union a;
630 int family, ifindex;
631 uint64_t flags;
632 int r;
633
634 assert(message);
635 assert(m);
636
637 assert_cc(sizeof(int) == sizeof(int32_t));
638
639 r = sd_bus_message_read(message, "i", &ifindex);
640 if (r < 0)
641 return r;
642
643 r = bus_message_read_in_addr_auto(message, error, &family, &a);
644 if (r < 0)
645 return r;
646
647 r = sd_bus_message_read(message, "t", &flags);
648 if (r < 0)
649 return r;
650
651 if (ifindex < 0)
652 return sd_bus_error_set(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid interface index");
653
654 r = validate_and_mangle_flags(NULL, &flags, 0, error);
655 if (r < 0)
656 return r;
657
658 r = dns_question_new_reverse(&question, family, &a);
659 if (r < 0)
660 return r;
661
662 bus_client_log(message, "address resolution");
663
664 r = dns_query_new(m, &q, question, question, NULL, ifindex, flags|SD_RESOLVED_NO_SEARCH);
665 if (r < 0)
666 return r;
667
668 q->bus_request = sd_bus_message_ref(message);
669 q->request_family = family;
670 q->request_address = a;
671 q->complete = bus_method_resolve_address_complete;
672
673 r = dns_query_bus_track(q, message);
674 if (r < 0)
675 return r;
676
677 r = dns_query_go(q);
678 if (r < 0)
679 return r;
680
681 TAKE_PTR(q);
682 return 1;
683 }
684
bus_message_append_rr(sd_bus_message * m,DnsResourceRecord * rr,int ifindex)685 static int bus_message_append_rr(sd_bus_message *m, DnsResourceRecord *rr, int ifindex) {
686 int r;
687
688 assert(m);
689 assert(rr);
690
691 r = sd_bus_message_open_container(m, 'r', "iqqay");
692 if (r < 0)
693 return r;
694
695 r = sd_bus_message_append(m, "iqq",
696 ifindex,
697 rr->key->class,
698 rr->key->type);
699 if (r < 0)
700 return r;
701
702 r = dns_resource_record_to_wire_format(rr, false);
703 if (r < 0)
704 return r;
705
706 r = sd_bus_message_append_array(m, 'y', rr->wire_format, rr->wire_format_size);
707 if (r < 0)
708 return r;
709
710 return sd_bus_message_close_container(m);
711 }
712
bus_method_resolve_record_complete(DnsQuery * query)713 static void bus_method_resolve_record_complete(DnsQuery *query) {
714 _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
715 _cleanup_(dns_query_freep) DnsQuery *q = query;
716 DnsResourceRecord *rr;
717 DnsQuestion *question;
718 unsigned added = 0;
719 int ifindex;
720 int r;
721
722 assert(q);
723
724 if (q->state != DNS_TRANSACTION_SUCCESS) {
725 r = reply_query_state(q);
726 goto finish;
727 }
728
729 r = dns_query_process_cname_many(q);
730 if (r == -ELOOP) {
731 r = reply_method_errorf(q, BUS_ERROR_CNAME_LOOP, "CNAME loop detected, or CNAME resolving disabled on '%s'", dns_query_string(q));
732 goto finish;
733 }
734 if (r < 0)
735 goto finish;
736 if (r == DNS_QUERY_CNAME) {
737 /* This was a cname, and the query was restarted. */
738 TAKE_PTR(q);
739 return;
740 }
741
742 r = sd_bus_message_new_method_return(q->bus_request, &reply);
743 if (r < 0)
744 goto finish;
745
746 r = sd_bus_message_open_container(reply, 'a', "(iqqay)");
747 if (r < 0)
748 goto finish;
749
750 question = dns_query_question_for_protocol(q, q->answer_protocol);
751
752 DNS_ANSWER_FOREACH_IFINDEX(rr, ifindex, q->answer) {
753 r = dns_question_matches_rr(question, rr, NULL);
754 if (r < 0)
755 goto finish;
756 if (r == 0)
757 continue;
758
759 r = bus_message_append_rr(reply, rr, ifindex);
760 if (r < 0)
761 goto finish;
762
763 added++;
764 }
765
766 if (added <= 0) {
767 r = reply_method_errorf(q, BUS_ERROR_NO_SUCH_RR, "Name '%s' does not have any RR of the requested type", dns_query_string(q));
768 goto finish;
769 }
770
771 r = sd_bus_message_close_container(reply);
772 if (r < 0)
773 goto finish;
774
775 r = sd_bus_message_append(reply, "t", dns_query_reply_flags_make(q));
776 if (r < 0)
777 goto finish;
778
779 q->bus_request = sd_bus_message_unref(q->bus_request);
780 r = sd_bus_send(q->manager->bus, reply, NULL);
781
782 finish:
783 if (r < 0) {
784 log_error_errno(r, "Failed to send record reply: %m");
785 (void) reply_method_errnof(q, r, NULL);
786 }
787 }
788
bus_method_resolve_record(sd_bus_message * message,void * userdata,sd_bus_error * error)789 static int bus_method_resolve_record(sd_bus_message *message, void *userdata, sd_bus_error *error) {
790 _cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL;
791 _cleanup_(dns_question_unrefp) DnsQuestion *question = NULL;
792 _cleanup_(dns_query_freep) DnsQuery *q = NULL;
793 Manager *m = userdata;
794 uint16_t class, type;
795 const char *name;
796 int r, ifindex;
797 uint64_t flags;
798
799 assert(message);
800 assert(m);
801
802 assert_cc(sizeof(int) == sizeof(int32_t));
803
804 r = sd_bus_message_read(message, "isqqt", &ifindex, &name, &class, &type, &flags);
805 if (r < 0)
806 return r;
807
808 if (ifindex < 0)
809 return sd_bus_error_set(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid interface index");
810
811 r = dns_name_is_valid(name);
812 if (r < 0)
813 return r;
814 if (r == 0)
815 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid name '%s'", name);
816
817 if (!dns_type_is_valid_query(type))
818 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Specified resource record type %" PRIu16 " may not be used in a query.", type);
819 if (dns_type_is_zone_transer(type))
820 return sd_bus_error_set(error, SD_BUS_ERROR_NOT_SUPPORTED, "Zone transfers not permitted via this programming interface.");
821 if (dns_type_is_obsolete(type))
822 return sd_bus_error_setf(error, SD_BUS_ERROR_NOT_SUPPORTED, "Specified DNS resource record type %" PRIu16 " is obsolete.", type);
823
824 r = validate_and_mangle_flags(name, &flags, 0, error);
825 if (r < 0)
826 return r;
827
828 question = dns_question_new(1);
829 if (!question)
830 return -ENOMEM;
831
832 key = dns_resource_key_new(class, type, name);
833 if (!key)
834 return -ENOMEM;
835
836 r = dns_question_add(question, key, 0);
837 if (r < 0)
838 return r;
839
840 bus_client_log(message, "resource record resolution");
841
842 /* Setting SD_RESOLVED_CLAMP_TTL: let's request that the TTL is fixed up for locally cached entries,
843 * after all we return it in the wire format blob. */
844 r = dns_query_new(m, &q, question, question, NULL, ifindex, flags|SD_RESOLVED_NO_SEARCH|SD_RESOLVED_CLAMP_TTL);
845 if (r < 0)
846 return r;
847
848 q->bus_request = sd_bus_message_ref(message);
849 q->complete = bus_method_resolve_record_complete;
850
851 r = dns_query_bus_track(q, message);
852 if (r < 0)
853 return r;
854
855 r = dns_query_go(q);
856 if (r < 0)
857 return r;
858
859 TAKE_PTR(q);
860 return 1;
861 }
862
append_srv(DnsQuery * q,sd_bus_message * reply,DnsResourceRecord * rr)863 static int append_srv(DnsQuery *q, sd_bus_message *reply, DnsResourceRecord *rr) {
864 _cleanup_(dns_resource_record_unrefp) DnsResourceRecord *canonical = NULL;
865 _cleanup_free_ char *normalized = NULL;
866 int r;
867
868 assert(q);
869 assert(reply);
870 assert(rr);
871 assert(rr->key);
872
873 if (rr->key->type != DNS_TYPE_SRV)
874 return 0;
875
876 if ((q->flags & SD_RESOLVED_NO_ADDRESS) == 0) {
877 /* First, let's see if we could find an appropriate A or AAAA
878 * record for the SRV record */
879 LIST_FOREACH(auxiliary_queries, aux, q->auxiliary_queries) {
880 DnsResourceRecord *zz;
881 DnsQuestion *question;
882
883 if (aux->state != DNS_TRANSACTION_SUCCESS)
884 continue;
885 if (aux->auxiliary_result != 0)
886 continue;
887
888 question = dns_query_question_for_protocol(aux, aux->answer_protocol);
889
890 r = dns_name_equal(dns_question_first_name(question), rr->srv.name);
891 if (r < 0)
892 return r;
893 if (r == 0)
894 continue;
895
896 DNS_ANSWER_FOREACH(zz, aux->answer) {
897
898 r = dns_question_matches_rr(question, zz, NULL);
899 if (r < 0)
900 return r;
901 if (r == 0)
902 continue;
903
904 canonical = dns_resource_record_ref(zz);
905 break;
906 }
907
908 if (canonical)
909 break;
910 }
911
912 /* Is there are successful A/AAAA lookup for this SRV RR? If not, don't add it */
913 if (!canonical)
914 return 0;
915 }
916
917 r = sd_bus_message_open_container(reply, 'r', "qqqsa(iiay)s");
918 if (r < 0)
919 return r;
920
921 r = dns_name_normalize(rr->srv.name, 0, &normalized);
922 if (r < 0)
923 return r;
924
925 r = sd_bus_message_append(
926 reply,
927 "qqqs",
928 rr->srv.priority, rr->srv.weight, rr->srv.port, normalized);
929 if (r < 0)
930 return r;
931
932 r = sd_bus_message_open_container(reply, 'a', "(iiay)");
933 if (r < 0)
934 return r;
935
936 if ((q->flags & SD_RESOLVED_NO_ADDRESS) == 0) {
937 LIST_FOREACH(auxiliary_queries, aux, q->auxiliary_queries) {
938 DnsResourceRecord *zz;
939 DnsQuestion *question;
940 int ifindex;
941
942 if (aux->state != DNS_TRANSACTION_SUCCESS)
943 continue;
944 if (aux->auxiliary_result != 0)
945 continue;
946
947 question = dns_query_question_for_protocol(aux, aux->answer_protocol);
948
949 r = dns_name_equal(dns_question_first_name(question), rr->srv.name);
950 if (r < 0)
951 return r;
952 if (r == 0)
953 continue;
954
955 DNS_ANSWER_FOREACH_IFINDEX(zz, ifindex, aux->answer) {
956
957 r = dns_question_matches_rr(question, zz, NULL);
958 if (r < 0)
959 return r;
960 if (r == 0)
961 continue;
962
963 r = append_address(reply, zz, ifindex);
964 if (r < 0)
965 return r;
966 }
967 }
968 }
969
970 r = sd_bus_message_close_container(reply);
971 if (r < 0)
972 return r;
973
974 if (canonical) {
975 normalized = mfree(normalized);
976
977 r = dns_name_normalize(dns_resource_key_name(canonical->key), 0, &normalized);
978 if (r < 0)
979 return r;
980 }
981
982 /* Note that above we appended the hostname as encoded in the
983 * SRV, and here the canonical hostname this maps to. */
984 r = sd_bus_message_append(reply, "s", normalized);
985 if (r < 0)
986 return r;
987
988 r = sd_bus_message_close_container(reply);
989 if (r < 0)
990 return r;
991
992 return 1;
993 }
994
append_txt(sd_bus_message * reply,DnsResourceRecord * rr)995 static int append_txt(sd_bus_message *reply, DnsResourceRecord *rr) {
996 int r;
997
998 assert(reply);
999 assert(rr);
1000 assert(rr->key);
1001
1002 if (rr->key->type != DNS_TYPE_TXT)
1003 return 0;
1004
1005 LIST_FOREACH(items, i, rr->txt.items) {
1006
1007 if (i->length <= 0)
1008 continue;
1009
1010 r = sd_bus_message_append_array(reply, 'y', i->data, i->length);
1011 if (r < 0)
1012 return r;
1013 }
1014
1015 return 1;
1016 }
1017
resolve_service_all_complete(DnsQuery * query)1018 static void resolve_service_all_complete(DnsQuery *query) {
1019 _cleanup_(dns_resource_record_unrefp) DnsResourceRecord *canonical = NULL;
1020 _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
1021 _cleanup_free_ char *name = NULL, *type = NULL, *domain = NULL;
1022 _cleanup_(dns_query_freep) DnsQuery *q = query;
1023 DnsQuestion *question;
1024 DnsResourceRecord *rr;
1025 unsigned added = 0;
1026 int r;
1027
1028 assert(q);
1029
1030 if (q->block_all_complete > 0) {
1031 TAKE_PTR(q);
1032 return;
1033 }
1034
1035 if ((q->flags & SD_RESOLVED_NO_ADDRESS) == 0) {
1036 DnsQuery *bad = NULL;
1037 bool have_success = false;
1038
1039 LIST_FOREACH(auxiliary_queries, aux, q->auxiliary_queries) {
1040
1041 switch (aux->state) {
1042
1043 case DNS_TRANSACTION_PENDING:
1044 /* If an auxiliary query is still pending, let's wait */
1045 TAKE_PTR(q);
1046 return;
1047
1048 case DNS_TRANSACTION_SUCCESS:
1049 if (aux->auxiliary_result == 0)
1050 have_success = true;
1051 else
1052 bad = aux;
1053 break;
1054
1055 default:
1056 bad = aux;
1057 break;
1058 }
1059 }
1060
1061 if (!have_success) {
1062 /* We can only return one error, hence pick the last error we encountered */
1063
1064 assert(bad);
1065
1066 if (bad->state == DNS_TRANSACTION_SUCCESS) {
1067 assert(bad->auxiliary_result != 0);
1068
1069 if (bad->auxiliary_result == -ELOOP) {
1070 r = reply_method_errorf(q, BUS_ERROR_CNAME_LOOP, "CNAME loop detected, or CNAME resolving disabled on '%s'", dns_query_string(bad));
1071 goto finish;
1072 }
1073
1074 assert(bad->auxiliary_result < 0);
1075 r = bad->auxiliary_result;
1076 goto finish;
1077 }
1078
1079 r = reply_query_state(bad);
1080 goto finish;
1081 }
1082 }
1083
1084 r = sd_bus_message_new_method_return(q->bus_request, &reply);
1085 if (r < 0)
1086 goto finish;
1087
1088 r = sd_bus_message_open_container(reply, 'a', "(qqqsa(iiay)s)");
1089 if (r < 0)
1090 goto finish;
1091
1092 question = dns_query_question_for_protocol(q, q->answer_protocol);
1093
1094 DNS_ANSWER_FOREACH(rr, q->answer) {
1095 r = dns_question_matches_rr(question, rr, NULL);
1096 if (r < 0)
1097 goto finish;
1098 if (r == 0)
1099 continue;
1100
1101 r = append_srv(q, reply, rr);
1102 if (r < 0)
1103 goto finish;
1104 if (r == 0) /* not an SRV record */
1105 continue;
1106
1107 if (!canonical)
1108 canonical = dns_resource_record_ref(rr);
1109
1110 added++;
1111 }
1112
1113 if (added <= 0) {
1114 r = reply_method_errorf(q, BUS_ERROR_NO_SUCH_RR, "'%s' does not have any RR of the requested type", dns_query_string(q));
1115 goto finish;
1116 }
1117
1118 r = sd_bus_message_close_container(reply);
1119 if (r < 0)
1120 goto finish;
1121
1122 r = sd_bus_message_open_container(reply, 'a', "ay");
1123 if (r < 0)
1124 goto finish;
1125
1126 DNS_ANSWER_FOREACH(rr, q->answer) {
1127 r = dns_question_matches_rr(question, rr, NULL);
1128 if (r < 0)
1129 goto finish;
1130 if (r == 0)
1131 continue;
1132
1133 r = append_txt(reply, rr);
1134 if (r < 0)
1135 goto finish;
1136 }
1137
1138 r = sd_bus_message_close_container(reply);
1139 if (r < 0)
1140 goto finish;
1141
1142 assert(canonical);
1143 r = dns_service_split(dns_resource_key_name(canonical->key), &name, &type, &domain);
1144 if (r < 0)
1145 goto finish;
1146
1147 r = sd_bus_message_append(
1148 reply,
1149 "ssst",
1150 name, type, domain,
1151 dns_query_reply_flags_make(q));
1152 if (r < 0)
1153 goto finish;
1154
1155 q->bus_request = sd_bus_message_unref(q->bus_request);
1156 r = sd_bus_send(q->manager->bus, reply, NULL);
1157
1158 finish:
1159 if (r < 0) {
1160 log_error_errno(r, "Failed to send service reply: %m");
1161 (void) reply_method_errnof(q, r, NULL);
1162 }
1163 }
1164
resolve_service_hostname_complete(DnsQuery * q)1165 static void resolve_service_hostname_complete(DnsQuery *q) {
1166 int r;
1167
1168 assert(q);
1169 assert(q->auxiliary_for);
1170
1171 if (q->state != DNS_TRANSACTION_SUCCESS) {
1172 resolve_service_all_complete(q->auxiliary_for);
1173 return;
1174 }
1175
1176 r = dns_query_process_cname_many(q);
1177 if (r == DNS_QUERY_CNAME) /* This was a cname, and the query was restarted. */
1178 return;
1179
1180 /* This auxiliary lookup is finished or failed, let's see if all are finished now. */
1181 q->auxiliary_result = r < 0 ? r : 0;
1182 resolve_service_all_complete(q->auxiliary_for);
1183 }
1184
resolve_service_hostname(DnsQuery * q,DnsResourceRecord * rr,int ifindex)1185 static int resolve_service_hostname(DnsQuery *q, DnsResourceRecord *rr, int ifindex) {
1186 _cleanup_(dns_question_unrefp) DnsQuestion *question = NULL;
1187 _cleanup_(dns_query_freep) DnsQuery *aux = NULL;
1188 int r;
1189
1190 assert(q);
1191 assert(rr);
1192 assert(rr->key);
1193 assert(rr->key->type == DNS_TYPE_SRV);
1194
1195 /* OK, we found an SRV record for the service. Let's resolve
1196 * the hostname included in it */
1197
1198 r = dns_question_new_address(&question, q->request_family, rr->srv.name, false);
1199 if (r < 0)
1200 return r;
1201
1202 r = dns_query_new(q->manager, &aux, question, question, NULL, ifindex, q->flags|SD_RESOLVED_NO_SEARCH);
1203 if (r < 0)
1204 return r;
1205
1206 aux->request_family = q->request_family;
1207 aux->complete = resolve_service_hostname_complete;
1208
1209 r = dns_query_make_auxiliary(aux, q);
1210 if (r == -EAGAIN)
1211 /* Too many auxiliary lookups? If so, don't complain,
1212 * let's just not add this one, we already have more
1213 * than enough */
1214 return 0;
1215 if (r < 0)
1216 return r;
1217
1218 /* Note that auxiliary queries do not track the original bus
1219 * client, only the primary request does that. */
1220
1221 r = dns_query_go(aux);
1222 if (r < 0)
1223 return r;
1224
1225 TAKE_PTR(aux);
1226 return 1;
1227 }
1228
bus_method_resolve_service_complete(DnsQuery * query)1229 static void bus_method_resolve_service_complete(DnsQuery *query) {
1230 _cleanup_(dns_query_freep) DnsQuery *q = query;
1231 bool has_root_domain = false;
1232 DnsResourceRecord *rr;
1233 DnsQuestion *question;
1234 unsigned found = 0;
1235 int ifindex, r;
1236
1237 assert(q);
1238
1239 if (q->state != DNS_TRANSACTION_SUCCESS) {
1240 r = reply_query_state(q);
1241 goto finish;
1242 }
1243
1244 r = dns_query_process_cname_many(q);
1245 if (r == -ELOOP) {
1246 r = reply_method_errorf(q, BUS_ERROR_CNAME_LOOP, "CNAME loop detected, or CNAME resolving disabled on '%s'", dns_query_string(q));
1247 goto finish;
1248 }
1249 if (r < 0)
1250 goto finish;
1251 if (r == DNS_QUERY_CNAME) {
1252 /* This was a cname, and the query was restarted. */
1253 TAKE_PTR(q);
1254 return;
1255 }
1256
1257 question = dns_query_question_for_protocol(q, q->answer_protocol);
1258
1259 DNS_ANSWER_FOREACH_IFINDEX(rr, ifindex, q->answer) {
1260 r = dns_question_matches_rr(question, rr, NULL);
1261 if (r < 0)
1262 goto finish;
1263 if (r == 0)
1264 continue;
1265
1266 if (rr->key->type != DNS_TYPE_SRV)
1267 continue;
1268
1269 if (dns_name_is_root(rr->srv.name)) {
1270 has_root_domain = true;
1271 continue;
1272 }
1273
1274 if ((q->flags & SD_RESOLVED_NO_ADDRESS) == 0) {
1275 q->block_all_complete++;
1276 r = resolve_service_hostname(q, rr, ifindex);
1277 q->block_all_complete--;
1278
1279 if (r < 0)
1280 goto finish;
1281 }
1282
1283 found++;
1284 }
1285
1286 if (has_root_domain && found <= 0) {
1287 /* If there's exactly one SRV RR and it uses the root domain as hostname, then the service is
1288 * explicitly not offered on the domain. Report this as a recognizable error. See RFC 2782,
1289 * Section "Usage Rules". */
1290 r = reply_method_errorf(q, BUS_ERROR_NO_SUCH_SERVICE, "'%s' does not provide the requested service", dns_query_string(q));
1291 goto finish;
1292 }
1293
1294 if (found <= 0) {
1295 r = reply_method_errorf(q, BUS_ERROR_NO_SUCH_RR, "'%s' does not have any RR of the requested type", dns_query_string(q));
1296 goto finish;
1297 }
1298
1299 /* Maybe we are already finished? check now... */
1300 resolve_service_all_complete(TAKE_PTR(q));
1301 return;
1302
1303 finish:
1304 if (r < 0) {
1305 log_error_errno(r, "Failed to send service reply: %m");
1306 (void) reply_method_errnof(q, r, NULL);
1307 }
1308 }
1309
bus_method_resolve_service(sd_bus_message * message,void * userdata,sd_bus_error * error)1310 static int bus_method_resolve_service(sd_bus_message *message, void *userdata, sd_bus_error *error) {
1311 _cleanup_(dns_question_unrefp) DnsQuestion *question_idna = NULL, *question_utf8 = NULL;
1312 _cleanup_(dns_query_freep) DnsQuery *q = NULL;
1313 const char *name, *type, *domain;
1314 Manager *m = userdata;
1315 int family, ifindex;
1316 uint64_t flags;
1317 int r;
1318
1319 assert(message);
1320 assert(m);
1321
1322 assert_cc(sizeof(int) == sizeof(int32_t));
1323
1324 r = sd_bus_message_read(message, "isssit", &ifindex, &name, &type, &domain, &family, &flags);
1325 if (r < 0)
1326 return r;
1327
1328 if (ifindex < 0)
1329 return sd_bus_error_set(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid interface index");
1330
1331 if (!IN_SET(family, AF_INET, AF_INET6, AF_UNSPEC))
1332 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Unknown address family %i", family);
1333
1334 if (isempty(name))
1335 name = NULL;
1336 else if (!dns_service_name_is_valid(name))
1337 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid service name '%s'", name);
1338
1339 if (isempty(type))
1340 type = NULL;
1341 else if (!dns_srv_type_is_valid(type))
1342 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid SRV service type '%s'", type);
1343
1344 r = dns_name_is_valid(domain);
1345 if (r < 0)
1346 return r;
1347 if (r == 0)
1348 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid domain '%s'", domain);
1349
1350 if (name && !type)
1351 return sd_bus_error_set(error, SD_BUS_ERROR_INVALID_ARGS, "Service name cannot be specified without service type.");
1352
1353 r = validate_and_mangle_flags(name, &flags, SD_RESOLVED_NO_TXT|SD_RESOLVED_NO_ADDRESS, error);
1354 if (r < 0)
1355 return r;
1356
1357 r = dns_question_new_service(&question_utf8, name, type, domain, !(flags & SD_RESOLVED_NO_TXT), false);
1358 if (r < 0)
1359 return r;
1360
1361 r = dns_question_new_service(&question_idna, name, type, domain, !(flags & SD_RESOLVED_NO_TXT), true);
1362 if (r < 0)
1363 return r;
1364
1365 bus_client_log(message, "service resolution");
1366
1367 r = dns_query_new(m, &q, question_utf8, question_idna, NULL, ifindex, flags|SD_RESOLVED_NO_SEARCH);
1368 if (r < 0)
1369 return r;
1370
1371 q->bus_request = sd_bus_message_ref(message);
1372 q->request_family = family;
1373 q->complete = bus_method_resolve_service_complete;
1374
1375 r = dns_query_bus_track(q, message);
1376 if (r < 0)
1377 return r;
1378
1379 r = dns_query_go(q);
1380 if (r < 0)
1381 return r;
1382
1383 TAKE_PTR(q);
1384 return 1;
1385 }
1386
bus_dns_server_append(sd_bus_message * reply,DnsServer * s,bool with_ifindex,bool extended)1387 int bus_dns_server_append(sd_bus_message *reply, DnsServer *s, bool with_ifindex, bool extended) {
1388 int r;
1389
1390 assert(reply);
1391
1392 if (!s) {
1393 if (with_ifindex) {
1394 if (extended)
1395 return sd_bus_message_append(reply, "(iiayqs)", 0, AF_UNSPEC, 0, 0, NULL);
1396 else
1397 return sd_bus_message_append(reply, "(iiay)", 0, AF_UNSPEC, 0);
1398 } else {
1399 if (extended)
1400 return sd_bus_message_append(reply, "(iayqs)", AF_UNSPEC, 0, 0, NULL);
1401 else
1402 return sd_bus_message_append(reply, "(iay)", AF_UNSPEC, 0);
1403 }
1404 }
1405
1406 r = sd_bus_message_open_container(reply, 'r', with_ifindex ? (extended ? "iiayqs" : "iiay") : (extended ? "iayqs" : "iay"));
1407 if (r < 0)
1408 return r;
1409
1410 if (with_ifindex) {
1411 r = sd_bus_message_append(reply, "i", dns_server_ifindex(s));
1412 if (r < 0)
1413 return r;
1414 }
1415
1416 r = sd_bus_message_append(reply, "i", s->family);
1417 if (r < 0)
1418 return r;
1419
1420 r = sd_bus_message_append_array(reply, 'y', &s->address, FAMILY_ADDRESS_SIZE(s->family));
1421 if (r < 0)
1422 return r;
1423
1424 if (extended) {
1425 r = sd_bus_message_append(reply, "q", s->port);
1426 if (r < 0)
1427 return r;
1428
1429 r = sd_bus_message_append(reply, "s", s->server_name);
1430 if (r < 0)
1431 return r;
1432 }
1433
1434 return sd_bus_message_close_container(reply);
1435 }
1436
bus_property_get_dns_servers_internal(sd_bus * bus,const char * path,const char * interface,const char * property,sd_bus_message * reply,void * userdata,sd_bus_error * error,bool extended)1437 static int bus_property_get_dns_servers_internal(
1438 sd_bus *bus,
1439 const char *path,
1440 const char *interface,
1441 const char *property,
1442 sd_bus_message *reply,
1443 void *userdata,
1444 sd_bus_error *error,
1445 bool extended) {
1446
1447 Manager *m = userdata;
1448 Link *l;
1449 int r;
1450
1451 assert(reply);
1452 assert(m);
1453
1454 r = sd_bus_message_open_container(reply, 'a', extended ? "(iiayqs)" : "(iiay)");
1455 if (r < 0)
1456 return r;
1457
1458 LIST_FOREACH(servers, s, m->dns_servers) {
1459 r = bus_dns_server_append(reply, s, true, extended);
1460 if (r < 0)
1461 return r;
1462 }
1463
1464 HASHMAP_FOREACH(l, m->links)
1465 LIST_FOREACH(servers, s, l->dns_servers) {
1466 r = bus_dns_server_append(reply, s, true, extended);
1467 if (r < 0)
1468 return r;
1469 }
1470
1471 return sd_bus_message_close_container(reply);
1472 }
1473
bus_property_get_dns_servers(sd_bus * bus,const char * path,const char * interface,const char * property,sd_bus_message * reply,void * userdata,sd_bus_error * error)1474 static int bus_property_get_dns_servers(
1475 sd_bus *bus,
1476 const char *path,
1477 const char *interface,
1478 const char *property,
1479 sd_bus_message *reply,
1480 void *userdata,
1481 sd_bus_error *error) {
1482 return bus_property_get_dns_servers_internal(bus, path, interface, property, reply, userdata, error, false);
1483 }
1484
bus_property_get_dns_servers_ex(sd_bus * bus,const char * path,const char * interface,const char * property,sd_bus_message * reply,void * userdata,sd_bus_error * error)1485 static int bus_property_get_dns_servers_ex(
1486 sd_bus *bus,
1487 const char *path,
1488 const char *interface,
1489 const char *property,
1490 sd_bus_message *reply,
1491 void *userdata,
1492 sd_bus_error *error) {
1493 return bus_property_get_dns_servers_internal(bus, path, interface, property, reply, userdata, error, true);
1494 }
1495
bus_property_get_fallback_dns_servers_internal(sd_bus * bus,const char * path,const char * interface,const char * property,sd_bus_message * reply,void * userdata,sd_bus_error * error,bool extended)1496 static int bus_property_get_fallback_dns_servers_internal(
1497 sd_bus *bus,
1498 const char *path,
1499 const char *interface,
1500 const char *property,
1501 sd_bus_message *reply,
1502 void *userdata,
1503 sd_bus_error *error,
1504 bool extended) {
1505
1506 DnsServer **f = userdata;
1507 int r;
1508
1509 assert(reply);
1510 assert(f);
1511
1512 r = sd_bus_message_open_container(reply, 'a', extended ? "(iiayqs)" : "(iiay)");
1513 if (r < 0)
1514 return r;
1515
1516 LIST_FOREACH(servers, s, *f) {
1517 r = bus_dns_server_append(reply, s, true, extended);
1518 if (r < 0)
1519 return r;
1520 }
1521
1522 return sd_bus_message_close_container(reply);
1523 }
1524
bus_property_get_fallback_dns_servers(sd_bus * bus,const char * path,const char * interface,const char * property,sd_bus_message * reply,void * userdata,sd_bus_error * error)1525 static int bus_property_get_fallback_dns_servers(
1526 sd_bus *bus,
1527 const char *path,
1528 const char *interface,
1529 const char *property,
1530 sd_bus_message *reply,
1531 void *userdata,
1532 sd_bus_error *error) {
1533 return bus_property_get_fallback_dns_servers_internal(bus, path, interface, property, reply, userdata, error, false);
1534 }
1535
bus_property_get_fallback_dns_servers_ex(sd_bus * bus,const char * path,const char * interface,const char * property,sd_bus_message * reply,void * userdata,sd_bus_error * error)1536 static int bus_property_get_fallback_dns_servers_ex(
1537 sd_bus *bus,
1538 const char *path,
1539 const char *interface,
1540 const char *property,
1541 sd_bus_message *reply,
1542 void *userdata,
1543 sd_bus_error *error) {
1544 return bus_property_get_fallback_dns_servers_internal(bus, path, interface, property, reply, userdata, error, true);
1545 }
1546
bus_property_get_current_dns_server_internal(sd_bus * bus,const char * path,const char * interface,const char * property,sd_bus_message * reply,void * userdata,sd_bus_error * error,bool extended)1547 static int bus_property_get_current_dns_server_internal(
1548 sd_bus *bus,
1549 const char *path,
1550 const char *interface,
1551 const char *property,
1552 sd_bus_message *reply,
1553 void *userdata,
1554 sd_bus_error *error,
1555 bool extended) {
1556
1557 DnsServer *s;
1558
1559 assert(reply);
1560 assert(userdata);
1561
1562 s = *(DnsServer **) userdata;
1563
1564 return bus_dns_server_append(reply, s, true, extended);
1565 }
1566
bus_property_get_current_dns_server(sd_bus * bus,const char * path,const char * interface,const char * property,sd_bus_message * reply,void * userdata,sd_bus_error * error)1567 static int bus_property_get_current_dns_server(
1568 sd_bus *bus,
1569 const char *path,
1570 const char *interface,
1571 const char *property,
1572 sd_bus_message *reply,
1573 void *userdata,
1574 sd_bus_error *error) {
1575 return bus_property_get_current_dns_server_internal(bus, path, interface, property, reply, userdata, error, false);
1576 }
1577
bus_property_get_current_dns_server_ex(sd_bus * bus,const char * path,const char * interface,const char * property,sd_bus_message * reply,void * userdata,sd_bus_error * error)1578 static int bus_property_get_current_dns_server_ex(
1579 sd_bus *bus,
1580 const char *path,
1581 const char *interface,
1582 const char *property,
1583 sd_bus_message *reply,
1584 void *userdata,
1585 sd_bus_error *error) {
1586 return bus_property_get_current_dns_server_internal(bus, path, interface, property, reply, userdata, error, true);
1587 }
1588
bus_property_get_domains(sd_bus * bus,const char * path,const char * interface,const char * property,sd_bus_message * reply,void * userdata,sd_bus_error * error)1589 static int bus_property_get_domains(
1590 sd_bus *bus,
1591 const char *path,
1592 const char *interface,
1593 const char *property,
1594 sd_bus_message *reply,
1595 void *userdata,
1596 sd_bus_error *error) {
1597
1598 Manager *m = userdata;
1599 Link *l;
1600 int r;
1601
1602 assert(reply);
1603 assert(m);
1604
1605 r = sd_bus_message_open_container(reply, 'a', "(isb)");
1606 if (r < 0)
1607 return r;
1608
1609 LIST_FOREACH(domains, d, m->search_domains) {
1610 r = sd_bus_message_append(reply, "(isb)", 0, d->name, d->route_only);
1611 if (r < 0)
1612 return r;
1613 }
1614
1615 HASHMAP_FOREACH(l, m->links) {
1616 LIST_FOREACH(domains, d, l->search_domains) {
1617 r = sd_bus_message_append(reply, "(isb)", l->ifindex, d->name, d->route_only);
1618 if (r < 0)
1619 return r;
1620 }
1621 }
1622
1623 return sd_bus_message_close_container(reply);
1624 }
1625
bus_property_get_transaction_statistics(sd_bus * bus,const char * path,const char * interface,const char * property,sd_bus_message * reply,void * userdata,sd_bus_error * error)1626 static int bus_property_get_transaction_statistics(
1627 sd_bus *bus,
1628 const char *path,
1629 const char *interface,
1630 const char *property,
1631 sd_bus_message *reply,
1632 void *userdata,
1633 sd_bus_error *error) {
1634
1635 Manager *m = userdata;
1636
1637 assert(reply);
1638 assert(m);
1639
1640 return sd_bus_message_append(reply, "(tt)",
1641 (uint64_t) hashmap_size(m->dns_transactions),
1642 (uint64_t) m->n_transactions_total);
1643 }
1644
bus_property_get_cache_statistics(sd_bus * bus,const char * path,const char * interface,const char * property,sd_bus_message * reply,void * userdata,sd_bus_error * error)1645 static int bus_property_get_cache_statistics(
1646 sd_bus *bus,
1647 const char *path,
1648 const char *interface,
1649 const char *property,
1650 sd_bus_message *reply,
1651 void *userdata,
1652 sd_bus_error *error) {
1653
1654 uint64_t size = 0, hit = 0, miss = 0;
1655 Manager *m = userdata;
1656
1657 assert(reply);
1658 assert(m);
1659
1660 LIST_FOREACH(scopes, s, m->dns_scopes) {
1661 size += dns_cache_size(&s->cache);
1662 hit += s->cache.n_hit;
1663 miss += s->cache.n_miss;
1664 }
1665
1666 return sd_bus_message_append(reply, "(ttt)", size, hit, miss);
1667 }
1668
bus_property_get_dnssec_statistics(sd_bus * bus,const char * path,const char * interface,const char * property,sd_bus_message * reply,void * userdata,sd_bus_error * error)1669 static int bus_property_get_dnssec_statistics(
1670 sd_bus *bus,
1671 const char *path,
1672 const char *interface,
1673 const char *property,
1674 sd_bus_message *reply,
1675 void *userdata,
1676 sd_bus_error *error) {
1677
1678 Manager *m = userdata;
1679
1680 assert(reply);
1681 assert(m);
1682
1683 return sd_bus_message_append(reply, "(tttt)",
1684 (uint64_t) m->n_dnssec_verdict[DNSSEC_SECURE],
1685 (uint64_t) m->n_dnssec_verdict[DNSSEC_INSECURE],
1686 (uint64_t) m->n_dnssec_verdict[DNSSEC_BOGUS],
1687 (uint64_t) m->n_dnssec_verdict[DNSSEC_INDETERMINATE]);
1688 }
1689
bus_property_get_ntas(sd_bus * bus,const char * path,const char * interface,const char * property,sd_bus_message * reply,void * userdata,sd_bus_error * error)1690 static int bus_property_get_ntas(
1691 sd_bus *bus,
1692 const char *path,
1693 const char *interface,
1694 const char *property,
1695 sd_bus_message *reply,
1696 void *userdata,
1697 sd_bus_error *error) {
1698
1699 Manager *m = userdata;
1700 const char *domain;
1701 int r;
1702
1703 assert(reply);
1704 assert(m);
1705
1706 r = sd_bus_message_open_container(reply, 'a', "s");
1707 if (r < 0)
1708 return r;
1709
1710 SET_FOREACH(domain, m->trust_anchor.negative_by_name) {
1711 r = sd_bus_message_append(reply, "s", domain);
1712 if (r < 0)
1713 return r;
1714 }
1715
1716 return sd_bus_message_close_container(reply);
1717 }
1718
1719 static BUS_DEFINE_PROPERTY_GET_ENUM(bus_property_get_dns_stub_listener_mode, dns_stub_listener_mode, DnsStubListenerMode);
1720 static BUS_DEFINE_PROPERTY_GET(bus_property_get_dnssec_supported, "b", Manager, manager_dnssec_supported);
1721 static BUS_DEFINE_PROPERTY_GET2(bus_property_get_dnssec_mode, "s", Manager, manager_get_dnssec_mode, dnssec_mode_to_string);
1722 static BUS_DEFINE_PROPERTY_GET2(bus_property_get_dns_over_tls_mode, "s", Manager, manager_get_dns_over_tls_mode, dns_over_tls_mode_to_string);
1723
bus_property_get_resolv_conf_mode(sd_bus * bus,const char * path,const char * interface,const char * property,sd_bus_message * reply,void * userdata,sd_bus_error * error)1724 static int bus_property_get_resolv_conf_mode(
1725 sd_bus *bus,
1726 const char *path,
1727 const char *interface,
1728 const char *property,
1729 sd_bus_message *reply,
1730 void *userdata,
1731 sd_bus_error *error) {
1732
1733 int r;
1734
1735 assert(reply);
1736
1737 r = resolv_conf_mode();
1738 if (r < 0) {
1739 log_warning_errno(r, "Failed to test /etc/resolv.conf mode, ignoring: %m");
1740 return sd_bus_message_append(reply, "s", NULL);
1741 }
1742
1743 return sd_bus_message_append(reply, "s", resolv_conf_mode_to_string(r));
1744 }
1745
bus_method_reset_statistics(sd_bus_message * message,void * userdata,sd_bus_error * error)1746 static int bus_method_reset_statistics(sd_bus_message *message, void *userdata, sd_bus_error *error) {
1747 Manager *m = userdata;
1748
1749 assert(message);
1750 assert(m);
1751
1752 bus_client_log(message, "statistics reset");
1753
1754 LIST_FOREACH(scopes, s, m->dns_scopes)
1755 s->cache.n_hit = s->cache.n_miss = 0;
1756
1757 m->n_transactions_total = 0;
1758 zero(m->n_dnssec_verdict);
1759
1760 return sd_bus_reply_method_return(message, NULL);
1761 }
1762
get_any_link(Manager * m,int ifindex,Link ** ret,sd_bus_error * error)1763 static int get_any_link(Manager *m, int ifindex, Link **ret, sd_bus_error *error) {
1764 Link *l;
1765
1766 assert(m);
1767 assert(ret);
1768
1769 l = hashmap_get(m->links, INT_TO_PTR(ifindex));
1770 if (!l)
1771 return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_LINK, "Link %i not known", ifindex);
1772
1773 *ret = l;
1774 return 0;
1775 }
1776
call_link_method(Manager * m,sd_bus_message * message,sd_bus_message_handler_t handler,sd_bus_error * error)1777 static int call_link_method(Manager *m, sd_bus_message *message, sd_bus_message_handler_t handler, sd_bus_error *error) {
1778 int ifindex, r;
1779 Link *l;
1780
1781 assert(m);
1782 assert(message);
1783 assert(handler);
1784
1785 r = bus_message_read_ifindex(message, error, &ifindex);
1786 if (r < 0)
1787 return r;
1788
1789 r = get_any_link(m, ifindex, &l, error);
1790 if (r < 0)
1791 return r;
1792
1793 return handler(message, l, error);
1794 }
1795
bus_method_set_link_dns_servers(sd_bus_message * message,void * userdata,sd_bus_error * error)1796 static int bus_method_set_link_dns_servers(sd_bus_message *message, void *userdata, sd_bus_error *error) {
1797 return call_link_method(userdata, message, bus_link_method_set_dns_servers, error);
1798 }
1799
bus_method_set_link_dns_servers_ex(sd_bus_message * message,void * userdata,sd_bus_error * error)1800 static int bus_method_set_link_dns_servers_ex(sd_bus_message *message, void *userdata, sd_bus_error *error) {
1801 return call_link_method(userdata, message, bus_link_method_set_dns_servers_ex, error);
1802 }
1803
bus_method_set_link_domains(sd_bus_message * message,void * userdata,sd_bus_error * error)1804 static int bus_method_set_link_domains(sd_bus_message *message, void *userdata, sd_bus_error *error) {
1805 return call_link_method(userdata, message, bus_link_method_set_domains, error);
1806 }
1807
bus_method_set_link_default_route(sd_bus_message * message,void * userdata,sd_bus_error * error)1808 static int bus_method_set_link_default_route(sd_bus_message *message, void *userdata, sd_bus_error *error) {
1809 return call_link_method(userdata, message, bus_link_method_set_default_route, error);
1810 }
1811
bus_method_set_link_llmnr(sd_bus_message * message,void * userdata,sd_bus_error * error)1812 static int bus_method_set_link_llmnr(sd_bus_message *message, void *userdata, sd_bus_error *error) {
1813 return call_link_method(userdata, message, bus_link_method_set_llmnr, error);
1814 }
1815
bus_method_set_link_mdns(sd_bus_message * message,void * userdata,sd_bus_error * error)1816 static int bus_method_set_link_mdns(sd_bus_message *message, void *userdata, sd_bus_error *error) {
1817 return call_link_method(userdata, message, bus_link_method_set_mdns, error);
1818 }
1819
bus_method_set_link_dns_over_tls(sd_bus_message * message,void * userdata,sd_bus_error * error)1820 static int bus_method_set_link_dns_over_tls(sd_bus_message *message, void *userdata, sd_bus_error *error) {
1821 return call_link_method(userdata, message, bus_link_method_set_dns_over_tls, error);
1822 }
1823
bus_method_set_link_dnssec(sd_bus_message * message,void * userdata,sd_bus_error * error)1824 static int bus_method_set_link_dnssec(sd_bus_message *message, void *userdata, sd_bus_error *error) {
1825 return call_link_method(userdata, message, bus_link_method_set_dnssec, error);
1826 }
1827
bus_method_set_link_dnssec_negative_trust_anchors(sd_bus_message * message,void * userdata,sd_bus_error * error)1828 static int bus_method_set_link_dnssec_negative_trust_anchors(sd_bus_message *message, void *userdata, sd_bus_error *error) {
1829 return call_link_method(userdata, message, bus_link_method_set_dnssec_negative_trust_anchors, error);
1830 }
1831
bus_method_revert_link(sd_bus_message * message,void * userdata,sd_bus_error * error)1832 static int bus_method_revert_link(sd_bus_message *message, void *userdata, sd_bus_error *error) {
1833 return call_link_method(userdata, message, bus_link_method_revert, error);
1834 }
1835
bus_method_get_link(sd_bus_message * message,void * userdata,sd_bus_error * error)1836 static int bus_method_get_link(sd_bus_message *message, void *userdata, sd_bus_error *error) {
1837 _cleanup_free_ char *p = NULL;
1838 Manager *m = userdata;
1839 int r, ifindex;
1840 Link *l;
1841
1842 assert(message);
1843 assert(m);
1844
1845 r = bus_message_read_ifindex(message, error, &ifindex);
1846 if (r < 0)
1847 return r;
1848
1849 r = get_any_link(m, ifindex, &l, error);
1850 if (r < 0)
1851 return r;
1852
1853 p = link_bus_path(l);
1854 if (!p)
1855 return -ENOMEM;
1856
1857 return sd_bus_reply_method_return(message, "o", p);
1858 }
1859
bus_method_flush_caches(sd_bus_message * message,void * userdata,sd_bus_error * error)1860 static int bus_method_flush_caches(sd_bus_message *message, void *userdata, sd_bus_error *error) {
1861 Manager *m = userdata;
1862
1863 assert(message);
1864 assert(m);
1865
1866 bus_client_log(message, "cache flush");
1867
1868 manager_flush_caches(m, LOG_INFO);
1869
1870 return sd_bus_reply_method_return(message, NULL);
1871 }
1872
bus_method_reset_server_features(sd_bus_message * message,void * userdata,sd_bus_error * error)1873 static int bus_method_reset_server_features(sd_bus_message *message, void *userdata, sd_bus_error *error) {
1874 Manager *m = userdata;
1875
1876 assert(message);
1877 assert(m);
1878
1879 bus_client_log(message, "server feature reset");
1880
1881 manager_reset_server_features(m);
1882
1883 return sd_bus_reply_method_return(message, NULL);
1884 }
1885
dnssd_service_on_bus_track(sd_bus_track * t,void * userdata)1886 static int dnssd_service_on_bus_track(sd_bus_track *t, void *userdata) {
1887 DnssdService *s = userdata;
1888
1889 assert(t);
1890 assert(s);
1891
1892 log_debug("Client of active request vanished, destroying DNS-SD service.");
1893 dnssd_service_free(s);
1894
1895 return 0;
1896 }
1897
bus_method_register_service(sd_bus_message * message,void * userdata,sd_bus_error * error)1898 static int bus_method_register_service(sd_bus_message *message, void *userdata, sd_bus_error *error) {
1899 _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
1900 _cleanup_(dnssd_service_freep) DnssdService *service = NULL;
1901 _cleanup_(sd_bus_track_unrefp) sd_bus_track *bus_track = NULL;
1902 const char *name, *name_template, *type;
1903 _cleanup_free_ char *path = NULL;
1904 DnssdService *s = NULL;
1905 Manager *m = userdata;
1906 uid_t euid;
1907 int r;
1908
1909 assert(message);
1910 assert(m);
1911
1912 if (m->mdns_support != RESOLVE_SUPPORT_YES)
1913 return sd_bus_error_set(error, SD_BUS_ERROR_NOT_SUPPORTED, "Support for MulticastDNS is disabled");
1914
1915 service = new0(DnssdService, 1);
1916 if (!service)
1917 return log_oom();
1918
1919 r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_EUID, &creds);
1920 if (r < 0)
1921 return r;
1922
1923 r = sd_bus_creds_get_euid(creds, &euid);
1924 if (r < 0)
1925 return r;
1926 service->originator = euid;
1927
1928 r = sd_bus_message_read(message, "sssqqq", &name, &name_template, &type,
1929 &service->port, &service->priority,
1930 &service->weight);
1931 if (r < 0)
1932 return r;
1933
1934 s = hashmap_get(m->dnssd_services, name);
1935 if (s)
1936 return sd_bus_error_setf(error, BUS_ERROR_DNSSD_SERVICE_EXISTS, "DNS-SD service '%s' exists already", name);
1937
1938 if (!dnssd_srv_type_is_valid(type))
1939 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "DNS-SD service type '%s' is invalid", type);
1940
1941 service->name = strdup(name);
1942 if (!service->name)
1943 return log_oom();
1944
1945 service->name_template = strdup(name_template);
1946 if (!service->name_template)
1947 return log_oom();
1948
1949 service->type = strdup(type);
1950 if (!service->type)
1951 return log_oom();
1952
1953 r = dnssd_render_instance_name(m, service, NULL);
1954 if (r < 0)
1955 return r;
1956
1957 r = sd_bus_message_enter_container(message, SD_BUS_TYPE_ARRAY, "a{say}");
1958 if (r < 0)
1959 return r;
1960
1961 while ((r = sd_bus_message_enter_container(message, SD_BUS_TYPE_ARRAY, "{say}")) > 0) {
1962 _cleanup_(dnssd_txtdata_freep) DnssdTxtData *txt_data = NULL;
1963 DnsTxtItem *last = NULL;
1964
1965 txt_data = new0(DnssdTxtData, 1);
1966 if (!txt_data)
1967 return log_oom();
1968
1969 while ((r = sd_bus_message_enter_container(message, SD_BUS_TYPE_DICT_ENTRY, "say")) > 0) {
1970 const char *key;
1971 const void *value;
1972 size_t size;
1973 DnsTxtItem *i;
1974
1975 r = sd_bus_message_read(message, "s", &key);
1976 if (r < 0)
1977 return r;
1978
1979 if (isempty(key))
1980 return sd_bus_error_set(error, SD_BUS_ERROR_INVALID_ARGS, "Keys in DNS-SD TXT RRs can't be empty");
1981
1982 if (!ascii_is_valid(key))
1983 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "TXT key '%s' contains non-ASCII symbols", key);
1984
1985 r = sd_bus_message_read_array(message, 'y', &value, &size);
1986 if (r < 0)
1987 return r;
1988
1989 r = dnssd_txt_item_new_from_data(key, value, size, &i);
1990 if (r < 0)
1991 return r;
1992
1993 LIST_INSERT_AFTER(items, txt_data->txt, last, i);
1994 last = i;
1995
1996 r = sd_bus_message_exit_container(message);
1997 if (r < 0)
1998 return r;
1999
2000 }
2001 if (r < 0)
2002 return r;
2003
2004 r = sd_bus_message_exit_container(message);
2005 if (r < 0)
2006 return r;
2007
2008 if (txt_data->txt) {
2009 LIST_PREPEND(items, service->txt_data_items, txt_data);
2010 txt_data = NULL;
2011 }
2012 }
2013 if (r < 0)
2014 return r;
2015
2016 r = sd_bus_message_exit_container(message);
2017 if (r < 0)
2018 return r;
2019
2020 if (!service->txt_data_items) {
2021 _cleanup_(dnssd_txtdata_freep) DnssdTxtData *txt_data = NULL;
2022
2023 txt_data = new0(DnssdTxtData, 1);
2024 if (!txt_data)
2025 return log_oom();
2026
2027 r = dns_txt_item_new_empty(&txt_data->txt);
2028 if (r < 0)
2029 return r;
2030
2031 LIST_PREPEND(items, service->txt_data_items, txt_data);
2032 txt_data = NULL;
2033 }
2034
2035 r = sd_bus_path_encode("/org/freedesktop/resolve1/dnssd", service->name, &path);
2036 if (r < 0)
2037 return r;
2038
2039 r = bus_verify_polkit_async(message, CAP_SYS_ADMIN,
2040 "org.freedesktop.resolve1.register-service",
2041 NULL, false, UID_INVALID,
2042 &m->polkit_registry, error);
2043 if (r < 0)
2044 return r;
2045 if (r == 0)
2046 return 1; /* Polkit will call us back */
2047
2048 r = hashmap_ensure_put(&m->dnssd_services, &string_hash_ops, service->name, service);
2049 if (r < 0)
2050 return r;
2051
2052 r = sd_bus_track_new(sd_bus_message_get_bus(message), &bus_track, dnssd_service_on_bus_track, service);
2053 if (r < 0)
2054 return r;
2055
2056 r = sd_bus_track_add_sender(bus_track, message);
2057 if (r < 0)
2058 return r;
2059
2060 service->manager = m;
2061
2062 service = NULL;
2063
2064 manager_refresh_rrs(m);
2065
2066 return sd_bus_reply_method_return(message, "o", path);
2067 }
2068
call_dnssd_method(Manager * m,sd_bus_message * message,sd_bus_message_handler_t handler,sd_bus_error * error)2069 static int call_dnssd_method(Manager *m, sd_bus_message *message, sd_bus_message_handler_t handler, sd_bus_error *error) {
2070 _cleanup_free_ char *name = NULL;
2071 DnssdService *s = NULL;
2072 const char *path;
2073 int r;
2074
2075 assert(m);
2076 assert(message);
2077 assert(handler);
2078
2079 r = sd_bus_message_read(message, "o", &path);
2080 if (r < 0)
2081 return r;
2082
2083 r = sd_bus_path_decode(path, "/org/freedesktop/resolve1/dnssd", &name);
2084 if (r == 0)
2085 return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_DNSSD_SERVICE, "DNS-SD service with object path '%s' does not exist", path);
2086 if (r < 0)
2087 return r;
2088
2089 s = hashmap_get(m->dnssd_services, name);
2090 if (!s)
2091 return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_DNSSD_SERVICE, "DNS-SD service '%s' not known", name);
2092
2093 return handler(message, s, error);
2094 }
2095
bus_method_unregister_service(sd_bus_message * message,void * userdata,sd_bus_error * error)2096 static int bus_method_unregister_service(sd_bus_message *message, void *userdata, sd_bus_error *error) {
2097 Manager *m = userdata;
2098
2099 assert(message);
2100 assert(m);
2101
2102 return call_dnssd_method(m, message, bus_dnssd_method_unregister, error);
2103 }
2104
2105 static const sd_bus_vtable resolve_vtable[] = {
2106 SD_BUS_VTABLE_START(0),
2107 SD_BUS_PROPERTY("LLMNRHostname", "s", NULL, offsetof(Manager, llmnr_hostname), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
2108 SD_BUS_PROPERTY("LLMNR", "s", bus_property_get_resolve_support, offsetof(Manager, llmnr_support), 0),
2109 SD_BUS_PROPERTY("MulticastDNS", "s", bus_property_get_resolve_support, offsetof(Manager, mdns_support), 0),
2110 SD_BUS_PROPERTY("DNSOverTLS", "s", bus_property_get_dns_over_tls_mode, 0, 0),
2111 SD_BUS_PROPERTY("DNS", "a(iiay)", bus_property_get_dns_servers, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
2112 SD_BUS_PROPERTY("DNSEx", "a(iiayqs)", bus_property_get_dns_servers_ex, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
2113 SD_BUS_PROPERTY("FallbackDNS", "a(iiay)", bus_property_get_fallback_dns_servers, offsetof(Manager, fallback_dns_servers), SD_BUS_VTABLE_PROPERTY_CONST),
2114 SD_BUS_PROPERTY("FallbackDNSEx", "a(iiayqs)", bus_property_get_fallback_dns_servers_ex, offsetof(Manager, fallback_dns_servers), SD_BUS_VTABLE_PROPERTY_CONST),
2115 SD_BUS_PROPERTY("CurrentDNSServer", "(iiay)", bus_property_get_current_dns_server, offsetof(Manager, current_dns_server), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
2116 SD_BUS_PROPERTY("CurrentDNSServerEx", "(iiayqs)", bus_property_get_current_dns_server_ex, offsetof(Manager, current_dns_server), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
2117 SD_BUS_PROPERTY("Domains", "a(isb)", bus_property_get_domains, 0, 0),
2118 SD_BUS_PROPERTY("TransactionStatistics", "(tt)", bus_property_get_transaction_statistics, 0, 0),
2119 SD_BUS_PROPERTY("CacheStatistics", "(ttt)", bus_property_get_cache_statistics, 0, 0),
2120 SD_BUS_PROPERTY("DNSSEC", "s", bus_property_get_dnssec_mode, 0, 0),
2121 SD_BUS_PROPERTY("DNSSECStatistics", "(tttt)", bus_property_get_dnssec_statistics, 0, 0),
2122 SD_BUS_PROPERTY("DNSSECSupported", "b", bus_property_get_dnssec_supported, 0, 0),
2123 SD_BUS_PROPERTY("DNSSECNegativeTrustAnchors", "as", bus_property_get_ntas, 0, 0),
2124 SD_BUS_PROPERTY("DNSStubListener", "s", bus_property_get_dns_stub_listener_mode, offsetof(Manager, dns_stub_listener_mode), 0),
2125 SD_BUS_PROPERTY("ResolvConfMode", "s", bus_property_get_resolv_conf_mode, 0, 0),
2126
2127 SD_BUS_METHOD_WITH_ARGS("ResolveHostname",
2128 SD_BUS_ARGS("i", ifindex, "s", name, "i", family, "t", flags),
2129 SD_BUS_RESULT("a(iiay)", addresses, "s", canonical, "t", flags),
2130 bus_method_resolve_hostname,
2131 SD_BUS_VTABLE_UNPRIVILEGED),
2132 SD_BUS_METHOD_WITH_ARGS("ResolveAddress",
2133 SD_BUS_ARGS("i", ifindex, "i", family, "ay", address, "t", flags),
2134 SD_BUS_RESULT("a(is)", names, "t", flags),
2135 bus_method_resolve_address,
2136 SD_BUS_VTABLE_UNPRIVILEGED),
2137 SD_BUS_METHOD_WITH_ARGS("ResolveRecord",
2138 SD_BUS_ARGS("i", ifindex, "s", name, "q", class, "q", type, "t", flags),
2139 SD_BUS_RESULT("a(iqqay)", records, "t", flags),
2140 bus_method_resolve_record,
2141 SD_BUS_VTABLE_UNPRIVILEGED),
2142 SD_BUS_METHOD_WITH_ARGS("ResolveService",
2143 SD_BUS_ARGS("i", ifindex,
2144 "s", name,
2145 "s", type,
2146 "s", domain,
2147 "i", family,
2148 "t", flags),
2149 SD_BUS_RESULT("a(qqqsa(iiay)s)", srv_data,
2150 "aay", txt_data,
2151 "s", canonical_name,
2152 "s", canonical_type,
2153 "s", canonical_domain,
2154 "t", flags),
2155 bus_method_resolve_service,
2156 SD_BUS_VTABLE_UNPRIVILEGED),
2157 SD_BUS_METHOD_WITH_ARGS("GetLink",
2158 SD_BUS_ARGS("i", ifindex),
2159 SD_BUS_RESULT("o", path),
2160 bus_method_get_link,
2161 SD_BUS_VTABLE_UNPRIVILEGED),
2162 SD_BUS_METHOD_WITH_ARGS("SetLinkDNS",
2163 SD_BUS_ARGS("i", ifindex, "a(iay)", addresses),
2164 SD_BUS_NO_RESULT,
2165 bus_method_set_link_dns_servers,
2166 SD_BUS_VTABLE_UNPRIVILEGED),
2167 SD_BUS_METHOD_WITH_ARGS("SetLinkDNSEx",
2168 SD_BUS_ARGS("i", ifindex, "a(iayqs)", addresses),
2169 SD_BUS_NO_RESULT,
2170 bus_method_set_link_dns_servers_ex,
2171 SD_BUS_VTABLE_UNPRIVILEGED),
2172 SD_BUS_METHOD_WITH_ARGS("SetLinkDomains",
2173 SD_BUS_ARGS("i", ifindex, "a(sb)", domains),
2174 SD_BUS_NO_RESULT,
2175 bus_method_set_link_domains,
2176 SD_BUS_VTABLE_UNPRIVILEGED),
2177 SD_BUS_METHOD_WITH_ARGS("SetLinkDefaultRoute",
2178 SD_BUS_ARGS("i", ifindex, "b", enable),
2179 SD_BUS_NO_RESULT,
2180 bus_method_set_link_default_route,
2181 SD_BUS_VTABLE_UNPRIVILEGED),
2182 SD_BUS_METHOD_WITH_ARGS("SetLinkLLMNR",
2183 SD_BUS_ARGS("i", ifindex, "s", mode),
2184 SD_BUS_NO_RESULT,
2185 bus_method_set_link_llmnr,
2186 SD_BUS_VTABLE_UNPRIVILEGED),
2187 SD_BUS_METHOD_WITH_ARGS("SetLinkMulticastDNS",
2188 SD_BUS_ARGS("i", ifindex, "s", mode),
2189 SD_BUS_NO_RESULT,
2190 bus_method_set_link_mdns,
2191 SD_BUS_VTABLE_UNPRIVILEGED),
2192 SD_BUS_METHOD_WITH_ARGS("SetLinkDNSOverTLS",
2193 SD_BUS_ARGS("i", ifindex, "s", mode),
2194 SD_BUS_NO_RESULT,
2195 bus_method_set_link_dns_over_tls,
2196 SD_BUS_VTABLE_UNPRIVILEGED),
2197 SD_BUS_METHOD_WITH_ARGS("SetLinkDNSSEC",
2198 SD_BUS_ARGS("i", ifindex, "s", mode),
2199 SD_BUS_NO_RESULT,
2200 bus_method_set_link_dnssec,
2201 SD_BUS_VTABLE_UNPRIVILEGED),
2202 SD_BUS_METHOD_WITH_ARGS("SetLinkDNSSECNegativeTrustAnchors",
2203 SD_BUS_ARGS("i", ifindex, "as", names),
2204 SD_BUS_NO_RESULT,
2205 bus_method_set_link_dnssec_negative_trust_anchors,
2206 SD_BUS_VTABLE_UNPRIVILEGED),
2207 SD_BUS_METHOD_WITH_ARGS("RevertLink",
2208 SD_BUS_ARGS("i", ifindex),
2209 SD_BUS_NO_RESULT,
2210 bus_method_revert_link,
2211 SD_BUS_VTABLE_UNPRIVILEGED),
2212 SD_BUS_METHOD_WITH_ARGS("RegisterService",
2213 SD_BUS_ARGS("s", name,
2214 "s", name_template,
2215 "s", type,
2216 "q", service_port,
2217 "q", service_priority,
2218 "q", service_weight,
2219 "aa{say}", txt_datas),
2220 SD_BUS_RESULT("o", service_path),
2221 bus_method_register_service,
2222 SD_BUS_VTABLE_UNPRIVILEGED),
2223 SD_BUS_METHOD_WITH_ARGS("UnregisterService",
2224 SD_BUS_ARGS("o", service_path),
2225 SD_BUS_NO_RESULT,
2226 bus_method_unregister_service,
2227 SD_BUS_VTABLE_UNPRIVILEGED),
2228 SD_BUS_METHOD_WITH_ARGS("ResetStatistics",
2229 SD_BUS_NO_ARGS,
2230 SD_BUS_NO_RESULT,
2231 bus_method_reset_statistics,
2232 SD_BUS_VTABLE_UNPRIVILEGED),
2233 SD_BUS_METHOD_WITH_ARGS("FlushCaches",
2234 SD_BUS_NO_ARGS,
2235 SD_BUS_NO_RESULT,
2236 bus_method_flush_caches,
2237 SD_BUS_VTABLE_UNPRIVILEGED),
2238 SD_BUS_METHOD_WITH_ARGS("ResetServerFeatures",
2239 SD_BUS_NO_ARGS,
2240 SD_BUS_NO_RESULT,
2241 bus_method_reset_server_features,
2242 SD_BUS_VTABLE_UNPRIVILEGED),
2243
2244 SD_BUS_VTABLE_END,
2245 };
2246
2247 const BusObjectImplementation manager_object = {
2248 "/org/freedesktop/resolve1",
2249 "org.freedesktop.resolve1.Manager",
2250 .vtables = BUS_VTABLES(resolve_vtable),
2251 .children = BUS_IMPLEMENTATIONS(&link_object,
2252 &dnssd_object),
2253 };
2254
match_prepare_for_sleep(sd_bus_message * message,void * userdata,sd_bus_error * ret_error)2255 static int match_prepare_for_sleep(sd_bus_message *message, void *userdata, sd_bus_error *ret_error) {
2256 Manager *m = userdata;
2257 int b, r;
2258
2259 assert(message);
2260 assert(m);
2261
2262 r = sd_bus_message_read(message, "b", &b);
2263 if (r < 0) {
2264 bus_log_parse_error(r);
2265 return 0;
2266 }
2267
2268 if (b)
2269 return 0;
2270
2271 log_debug("Coming back from suspend, verifying all RRs...");
2272
2273 manager_verify_all(m);
2274 return 0;
2275 }
2276
manager_connect_bus(Manager * m)2277 int manager_connect_bus(Manager *m) {
2278 int r;
2279
2280 assert(m);
2281
2282 if (m->bus)
2283 return 0;
2284
2285 r = bus_open_system_watch_bind_with_description(&m->bus, "bus-api-resolve");
2286 if (r < 0)
2287 return log_error_errno(r, "Failed to connect to system bus: %m");
2288
2289 r = bus_add_implementation(m->bus, &manager_object, m);
2290 if (r < 0)
2291 return r;
2292
2293 r = bus_log_control_api_register(m->bus);
2294 if (r < 0)
2295 return r;
2296
2297 r = sd_bus_request_name_async(m->bus, NULL, "org.freedesktop.resolve1", 0, NULL, NULL);
2298 if (r < 0)
2299 return log_error_errno(r, "Failed to request name: %m");
2300
2301 r = sd_bus_attach_event(m->bus, m->event, 0);
2302 if (r < 0)
2303 return log_error_errno(r, "Failed to attach bus to event loop: %m");
2304
2305 r = sd_bus_match_signal_async(
2306 m->bus,
2307 NULL,
2308 "org.freedesktop.login1",
2309 "/org/freedesktop/login1",
2310 "org.freedesktop.login1.Manager",
2311 "PrepareForSleep",
2312 match_prepare_for_sleep,
2313 NULL,
2314 m);
2315 if (r < 0)
2316 log_warning_errno(r, "Failed to request match for PrepareForSleep, ignoring: %m");
2317
2318 return 0;
2319 }
2320
_manager_send_changed(Manager * manager,const char * property,...)2321 int _manager_send_changed(Manager *manager, const char *property, ...) {
2322 assert(manager);
2323
2324 if (sd_bus_is_ready(manager->bus) <= 0)
2325 return 0;
2326
2327 char **l = strv_from_stdarg_alloca(property);
2328
2329 int r = sd_bus_emit_properties_changed_strv(
2330 manager->bus,
2331 "/org/freedesktop/resolve1",
2332 "org.freedesktop.resolve1.Manager",
2333 l);
2334 if (r < 0)
2335 log_notice_errno(r, "Failed to emit notification about changed property %s: %m", property);
2336 return r;
2337 }
2338