src/resolve/resolved-bus.c

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