src/resolve/resolved-manager.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include <fcntl.h>
   4 #include <netinet/in.h>
   5 #include <poll.h>
   6 #include <stdio_ext.h>
   7 #include <sys/ioctl.h>
   8 #include <sys/stat.h>
   9 #include <sys/types.h>
  10 #include <unistd.h>
  11
  12 #if HAVE_LIBIDN2
  13 #include <idn2.h>
  14 #endif
  15
  16 #include "af-list.h"
  17 #include "alloc-util.h"
  18 #include "dirent-util.h"
  19 #include "dns-domain.h"
  20 #include "fd-util.h"
  21 #include "fileio.h"
  22 #include "hostname-util.h"
  23 #include "io-util.h"
  24 #include "missing_network.h"
  25 #include "netlink-util.h"
  26 #include "network-internal.h"
  27 #include "ordered-set.h"
  28 #include "parse-util.h"
  29 #include "random-util.h"
  30 #include "resolved-bus.h"
  31 #include "resolved-conf.h"
  32 #include "resolved-dns-stub.h"
  33 #include "resolved-dnssd.h"
  34 #include "resolved-etc-hosts.h"
  35 #include "resolved-llmnr.h"
  36 #include "resolved-manager.h"
  37 #include "resolved-mdns.h"
  38 #include "resolved-resolv-conf.h"
  39 #include "socket-util.h"
  40 #include "string-table.h"
  41 #include "string-util.h"
  42 #include "utf8.h"
  43
  44 #define SEND_TIMEOUT_USEC (200 * USEC_PER_MSEC)
  45
  46 static int manager_process_link(sd_netlink *rtnl, sd_netlink_message *mm, void *userdata) {
  47         Manager *m = userdata;
  48         uint16_t type;
  49         Link *l;
  50         int ifindex, r;
  51
  52         assert(rtnl);
  53         assert(m);
  54         assert(mm);
  55
  56         r = sd_netlink_message_get_type(mm, &type);
  57         if (r < 0)
  58                 goto fail;
  59
  60         r = sd_rtnl_message_link_get_ifindex(mm, &ifindex);
  61         if (r < 0)
  62                 goto fail;
  63
  64         l = hashmap_get(m->links, INT_TO_PTR(ifindex));
  65
  66         switch (type) {
  67
  68         case RTM_NEWLINK:{
  69                 bool is_new = !l;
  70
  71                 if (!l) {
  72                         r = link_new(m, &l, ifindex);
  73                         if (r < 0)
  74                                 goto fail;
  75                 }
  76
  77                 r = link_process_rtnl(l, mm);
  78                 if (r < 0)
  79                         goto fail;
  80
  81                 r = link_update(l);
  82                 if (r < 0)
  83                         goto fail;
  84
  85                 if (is_new)
  86                         log_debug("Found new link %i/%s", ifindex, l->name);
  87
  88                 break;
  89         }
  90
  91         case RTM_DELLINK:
  92                 if (l) {
  93                         log_debug("Removing link %i/%s", l->ifindex, l->name);
  94                         link_remove_user(l);
  95                         link_free(l);
  96                 }
  97
  98                 break;
  99         }
 100
 101         return 0;
 102
 103 fail:
 104         log_warning_errno(r, "Failed to process RTNL link message: %m");
 105         return 0;
 106 }
 107
 108 static int manager_process_address(sd_netlink *rtnl, sd_netlink_message *mm, void *userdata) {
 109         Manager *m = userdata;
 110         union in_addr_union address;
 111         uint16_t type;
 112         int r, ifindex, family;
 113         LinkAddress *a;
 114         Link *l;
 115
 116         assert(rtnl);
 117         assert(mm);
 118         assert(m);
 119
 120         r = sd_netlink_message_get_type(mm, &type);
 121         if (r < 0)
 122                 goto fail;
 123
 124         r = sd_rtnl_message_addr_get_ifindex(mm, &ifindex);
 125         if (r < 0)
 126                 goto fail;
 127
 128         l = hashmap_get(m->links, INT_TO_PTR(ifindex));
 129         if (!l)
 130                 return 0;
 131
 132         r = sd_rtnl_message_addr_get_family(mm, &family);
 133         if (r < 0)
 134                 goto fail;
 135
 136         switch (family) {
 137
 138         case AF_INET:
 139                 r = sd_netlink_message_read_in_addr(mm, IFA_LOCAL, &address.in);
 140                 if (r < 0) {
 141                         r = sd_netlink_message_read_in_addr(mm, IFA_ADDRESS, &address.in);
 142                         if (r < 0)
 143                                 goto fail;
 144                 }
 145
 146                 break;
 147
 148         case AF_INET6:
 149                 r = sd_netlink_message_read_in6_addr(mm, IFA_LOCAL, &address.in6);
 150                 if (r < 0) {
 151                         r = sd_netlink_message_read_in6_addr(mm, IFA_ADDRESS, &address.in6);
 152                         if (r < 0)
 153                                 goto fail;
 154                 }
 155
 156                 break;
 157
 158         default:
 159                 return 0;
 160         }
 161
 162         a = link_find_address(l, family, &address);
 163
 164         switch (type) {
 165
 166         case RTM_NEWADDR:
 167
 168                 if (!a) {
 169                         r = link_address_new(l, &a, family, &address);
 170                         if (r < 0)
 171                                 return r;
 172                 }
 173
 174                 r = link_address_update_rtnl(a, mm);
 175                 if (r < 0)
 176                         return r;
 177
 178                 break;
 179
 180         case RTM_DELADDR:
 181                 link_address_free(a);
 182                 break;
 183         }
 184
 185         return 0;
 186
 187 fail:
 188         log_warning_errno(r, "Failed to process RTNL address message: %m");
 189         return 0;
 190 }
 191
 192 static int manager_rtnl_listen(Manager *m) {
 193         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL;
 194         sd_netlink_message *i;
 195         int r;
 196
 197         assert(m);
 198
 199         /* First, subscribe to interfaces coming and going */
 200         r = sd_netlink_open(&m->rtnl);
 201         if (r < 0)
 202                 return r;
 203
 204         r = sd_netlink_attach_event(m->rtnl, m->event, SD_EVENT_PRIORITY_IMPORTANT);
 205         if (r < 0)
 206                 return r;
 207
 208         r = sd_netlink_add_match(m->rtnl, NULL, RTM_NEWLINK, manager_process_link, NULL, m, "resolve-NEWLINK");
 209         if (r < 0)
 210                 return r;
 211
 212         r = sd_netlink_add_match(m->rtnl, NULL, RTM_DELLINK, manager_process_link, NULL, m, "resolve-DELLINK");
 213         if (r < 0)
 214                 return r;
 215
 216         r = sd_netlink_add_match(m->rtnl, NULL, RTM_NEWADDR, manager_process_address, NULL, m, "resolve-NEWADDR");
 217         if (r < 0)
 218                 return r;
 219
 220         r = sd_netlink_add_match(m->rtnl, NULL, RTM_DELADDR, manager_process_address, NULL, m, "resolve-DELADDR");
 221         if (r < 0)
 222                 return r;
 223
 224         /* Then, enumerate all links */
 225         r = sd_rtnl_message_new_link(m->rtnl, &req, RTM_GETLINK, 0);
 226         if (r < 0)
 227                 return r;
 228
 229         r = sd_netlink_message_request_dump(req, true);
 230         if (r < 0)
 231                 return r;
 232
 233         r = sd_netlink_call(m->rtnl, req, 0, &reply);
 234         if (r < 0)
 235                 return r;
 236
 237         for (i = reply; i; i = sd_netlink_message_next(i)) {
 238                 r = manager_process_link(m->rtnl, i, m);
 239                 if (r < 0)
 240                         return r;
 241         }
 242
 243         req = sd_netlink_message_unref(req);
 244         reply = sd_netlink_message_unref(reply);
 245
 246         /* Finally, enumerate all addresses, too */
 247         r = sd_rtnl_message_new_addr(m->rtnl, &req, RTM_GETADDR, 0, AF_UNSPEC);
 248         if (r < 0)
 249                 return r;
 250
 251         r = sd_netlink_message_request_dump(req, true);
 252         if (r < 0)
 253                 return r;
 254
 255         r = sd_netlink_call(m->rtnl, req, 0, &reply);
 256         if (r < 0)
 257                 return r;
 258
 259         for (i = reply; i; i = sd_netlink_message_next(i)) {
 260                 r = manager_process_address(m->rtnl, i, m);
 261                 if (r < 0)
 262                         return r;
 263         }
 264
 265         return r;
 266 }
 267
 268 static int on_network_event(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
 269         Manager *m = userdata;
 270         Iterator i;
 271         Link *l;
 272         int r;
 273
 274         assert(m);
 275
 276         sd_network_monitor_flush(m->network_monitor);
 277
 278         HASHMAP_FOREACH(l, m->links, i) {
 279                 r = link_update(l);
 280                 if (r < 0)
 281                         log_warning_errno(r, "Failed to update monitor information for %i: %m", l->ifindex);
 282         }
 283
 284         (void) manager_write_resolv_conf(m);
 285
 286         return 0;
 287 }
 288
 289 static int manager_network_monitor_listen(Manager *m) {
 290         int r, fd, events;
 291
 292         assert(m);
 293
 294         r = sd_network_monitor_new(&m->network_monitor, NULL);
 295         if (r < 0)
 296                 return r;
 297
 298         fd = sd_network_monitor_get_fd(m->network_monitor);
 299         if (fd < 0)
 300                 return fd;
 301
 302         events = sd_network_monitor_get_events(m->network_monitor);
 303         if (events < 0)
 304                 return events;
 305
 306         r = sd_event_add_io(m->event, &m->network_event_source, fd, events, &on_network_event, m);
 307         if (r < 0)
 308                 return r;
 309
 310         r = sd_event_source_set_priority(m->network_event_source, SD_EVENT_PRIORITY_IMPORTANT+5);
 311         if (r < 0)
 312                 return r;
 313
 314         (void) sd_event_source_set_description(m->network_event_source, "network-monitor");
 315
 316         return 0;
 317 }
 318
 319 static int determine_hostname(char **full_hostname, char **llmnr_hostname, char **mdns_hostname) {
 320         _cleanup_free_ char *h = NULL, *n = NULL;
 321 #if HAVE_LIBIDN2
 322         _cleanup_free_ char *utf8 = NULL;
 323 #elif HAVE_LIBIDN
 324         int k;
 325 #endif
 326         char label[DNS_LABEL_MAX];
 327         const char *p, *decoded;
 328         int r;
 329
 330         assert(full_hostname);
 331         assert(llmnr_hostname);
 332         assert(mdns_hostname);
 333
 334         /* Extract and normalize the first label of the locally configured hostname, and check it's not "localhost". */
 335
 336         r = gethostname_strict(&h);
 337         if (r < 0)
 338                 return log_debug_errno(r, "Can't determine system hostname: %m");
 339
 340         p = h;
 341         r = dns_label_unescape(&p, label, sizeof label, 0);
 342         if (r < 0)
 343                 return log_error_errno(r, "Failed to unescape host name: %m");
 344         if (r == 0)
 345                 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
 346                                        "Couldn't find a single label in hostname.");
 347
 348 #if HAVE_LIBIDN2
 349         r = idn2_to_unicode_8z8z(label, &utf8, 0);
 350         if (r != IDN2_OK)
 351                 return log_error("Failed to undo IDNA: %s", idn2_strerror(r));
 352         assert(utf8_is_valid(utf8));
 353
 354         r = strlen(utf8);
 355         decoded = utf8;
 356 #elif HAVE_LIBIDN
 357         k = dns_label_undo_idna(label, r, label, sizeof label);
 358         if (k < 0)
 359                 return log_error_errno(k, "Failed to undo IDNA: %m");
 360         if (k > 0)
 361                 r = k;
 362
 363         if (!utf8_is_valid(label))
 364                 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
 365                                        "System hostname is not UTF-8 clean.");
 366         decoded = label;
 367 #else
 368         decoded = label; /* no decoding */
 369 #endif
 370
 371         r = dns_label_escape_new(decoded, r, &n);
 372         if (r < 0)
 373                 return log_error_errno(r, "Failed to escape host name: %m");
 374
 375         if (is_localhost(n))
 376                 return log_debug_errno(SYNTHETIC_ERRNO(EINVAL),
 377                                        "System hostname is 'localhost', ignoring.");
 378
 379         r = dns_name_concat(n, "local", 0, mdns_hostname);
 380         if (r < 0)
 381                 return log_error_errno(r, "Failed to determine mDNS hostname: %m");
 382
 383         *llmnr_hostname = TAKE_PTR(n);
 384         *full_hostname = TAKE_PTR(h);
 385
 386         return 0;
 387 }
 388
 389 static const char *fallback_hostname(void) {
 390
 391         /* Determine the fall back hostname. For exposing this system to the outside world, we cannot have it to be
 392          * "localhost" even if that's the compiled in hostname. In this case, let's revert to "linux" instead. */
 393
 394         if (is_localhost(FALLBACK_HOSTNAME))
 395                 return "linux";
 396
 397         return FALLBACK_HOSTNAME;
 398 }
 399
 400 static int make_fallback_hostnames(char **full_hostname, char **llmnr_hostname, char **mdns_hostname) {
 401         _cleanup_free_ char *n = NULL, *m = NULL;
 402         char label[DNS_LABEL_MAX], *h;
 403         const char *p;
 404         int r;
 405
 406         assert(full_hostname);
 407         assert(llmnr_hostname);
 408         assert(mdns_hostname);
 409
 410         p = fallback_hostname();
 411         r = dns_label_unescape(&p, label, sizeof label, 0);
 412         if (r < 0)
 413                 return log_error_errno(r, "Failed to unescape fallback host name: %m");
 414
 415         assert(r > 0); /* The fallback hostname must have at least one label */
 416
 417         r = dns_label_escape_new(label, r, &n);
 418         if (r < 0)
 419                 return log_error_errno(r, "Failed to escape fallback hostname: %m");
 420
 421         r = dns_name_concat(n, "local", 0, &m);
 422         if (r < 0)
 423                 return log_error_errno(r, "Failed to concatenate mDNS hostname: %m");
 424
 425         h = strdup(fallback_hostname());
 426         if (!h)
 427                 return log_oom();
 428
 429         *llmnr_hostname = TAKE_PTR(n);
 430         *mdns_hostname = TAKE_PTR(m);
 431
 432         *full_hostname = h;
 433
 434         return 0;
 435 }
 436
 437 static int on_hostname_change(sd_event_source *es, int fd, uint32_t revents, void *userdata) {
 438         _cleanup_free_ char *full_hostname = NULL, *llmnr_hostname = NULL, *mdns_hostname = NULL;
 439         Manager *m = userdata;
 440         int r;
 441
 442         assert(m);
 443
 444         r = determine_hostname(&full_hostname, &llmnr_hostname, &mdns_hostname);
 445         if (r < 0)
 446                 return 0; /* ignore invalid hostnames */
 447
 448         if (streq(full_hostname, m->full_hostname) &&
 449             streq(llmnr_hostname, m->llmnr_hostname) &&
 450             streq(mdns_hostname, m->mdns_hostname))
 451                 return 0;
 452
 453         log_info("System hostname changed to '%s'.", full_hostname);
 454
 455         free_and_replace(m->full_hostname, full_hostname);
 456         free_and_replace(m->llmnr_hostname, llmnr_hostname);
 457         free_and_replace(m->mdns_hostname, mdns_hostname);
 458
 459         manager_refresh_rrs(m);
 460
 461         return 0;
 462 }
 463
 464 static int manager_watch_hostname(Manager *m) {
 465         int r;
 466
 467         assert(m);
 468
 469         m->hostname_fd = open("/proc/sys/kernel/hostname",
 470                               O_RDONLY|O_CLOEXEC|O_NONBLOCK|O_NOCTTY);
 471         if (m->hostname_fd < 0) {
 472                 log_warning_errno(errno, "Failed to watch hostname: %m");
 473                 return 0;
 474         }
 475
 476         r = sd_event_add_io(m->event, &m->hostname_event_source, m->hostname_fd, 0, on_hostname_change, m);
 477         if (r < 0) {
 478                 if (r == -EPERM)
 479                         /* kernels prior to 3.2 don't support polling this file. Ignore the failure. */
 480                         m->hostname_fd = safe_close(m->hostname_fd);
 481                 else
 482                         return log_error_errno(r, "Failed to add hostname event source: %m");
 483         }
 484
 485         (void) sd_event_source_set_description(m->hostname_event_source, "hostname");
 486
 487         r = determine_hostname(&m->full_hostname, &m->llmnr_hostname, &m->mdns_hostname);
 488         if (r < 0) {
 489                 log_info("Defaulting to hostname '%s'.", fallback_hostname());
 490
 491                 r = make_fallback_hostnames(&m->full_hostname, &m->llmnr_hostname, &m->mdns_hostname);
 492                 if (r < 0)
 493                         return r;
 494         } else
 495                 log_info("Using system hostname '%s'.", m->full_hostname);
 496
 497         return 0;
 498 }
 499
 500 static int manager_sigusr1(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
 501         _cleanup_free_ char *buffer = NULL;
 502         _cleanup_fclose_ FILE *f = NULL;
 503         Manager *m = userdata;
 504         DnsServer *server;
 505         size_t size = 0;
 506         DnsScope *scope;
 507         Iterator i;
 508         Link *l;
 509
 510         assert(s);
 511         assert(si);
 512         assert(m);
 513
 514         f = open_memstream(&buffer, &size);
 515         if (!f)
 516                 return log_oom();
 517
 518         (void) __fsetlocking(f, FSETLOCKING_BYCALLER);
 519
 520         LIST_FOREACH(scopes, scope, m->dns_scopes)
 521                 dns_scope_dump(scope, f);
 522
 523         LIST_FOREACH(servers, server, m->dns_servers)
 524                 dns_server_dump(server, f);
 525         LIST_FOREACH(servers, server, m->fallback_dns_servers)
 526                 dns_server_dump(server, f);
 527         HASHMAP_FOREACH(l, m->links, i)
 528                 LIST_FOREACH(servers, server, l->dns_servers)
 529                         dns_server_dump(server, f);
 530
 531         if (fflush_and_check(f) < 0)
 532                 return log_oom();
 533
 534         log_dump(LOG_INFO, buffer);
 535         return 0;
 536 }
 537
 538 static int manager_sigusr2(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
 539         Manager *m = userdata;
 540
 541         assert(s);
 542         assert(si);
 543         assert(m);
 544
 545         manager_flush_caches(m);
 546
 547         return 0;
 548 }
 549
 550 static int manager_sigrtmin1(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
 551         Manager *m = userdata;
 552
 553         assert(s);
 554         assert(si);
 555         assert(m);
 556
 557         manager_reset_server_features(m);
 558         return 0;
 559 }
 560
 561 int manager_new(Manager **ret) {
 562         _cleanup_(manager_freep) Manager *m = NULL;
 563         int r;
 564
 565         assert(ret);
 566
 567         m = new(Manager, 1);
 568         if (!m)
 569                 return -ENOMEM;
 570
 571         *m = (Manager) {
 572                 .llmnr_ipv4_udp_fd = -1,
 573                 .llmnr_ipv6_udp_fd = -1,
 574                 .llmnr_ipv4_tcp_fd = -1,
 575                 .llmnr_ipv6_tcp_fd = -1,
 576                 .mdns_ipv4_fd = -1,
 577                 .mdns_ipv6_fd = -1,
 578                 .dns_stub_udp_fd = -1,
 579                 .dns_stub_tcp_fd = -1,
 580                 .hostname_fd = -1,
 581
 582                 .llmnr_support = RESOLVE_SUPPORT_YES,
 583                 .mdns_support = RESOLVE_SUPPORT_YES,
 584                 .dnssec_mode = DEFAULT_DNSSEC_MODE,
 585                 .dns_over_tls_mode = DEFAULT_DNS_OVER_TLS_MODE,
 586                 .enable_cache = true,
 587                 .dns_stub_listener_mode = DNS_STUB_LISTENER_YES,
 588                 .read_resolv_conf = true,
 589                 .need_builtin_fallbacks = true,
 590                 .etc_hosts_last = USEC_INFINITY,
 591                 .etc_hosts_mtime = USEC_INFINITY,
 592                 .read_etc_hosts = true,
 593         };
 594
 595         r = dns_trust_anchor_load(&m->trust_anchor);
 596         if (r < 0)
 597                 return r;
 598
 599         r = manager_parse_config_file(m);
 600         if (r < 0)
 601                 log_warning_errno(r, "Failed to parse configuration file: %m");
 602
 603         r = sd_event_default(&m->event);
 604         if (r < 0)
 605                 return r;
 606
 607         (void) sd_event_add_signal(m->event, NULL, SIGTERM, NULL,  NULL);
 608         (void) sd_event_add_signal(m->event, NULL, SIGINT, NULL, NULL);
 609
 610         (void) sd_event_set_watchdog(m->event, true);
 611
 612         r = manager_watch_hostname(m);
 613         if (r < 0)
 614                 return r;
 615
 616         r = dnssd_load(m);
 617         if (r < 0)
 618                 log_warning_errno(r, "Failed to load DNS-SD configuration files: %m");
 619
 620         r = dns_scope_new(m, &m->unicast_scope, NULL, DNS_PROTOCOL_DNS, AF_UNSPEC);
 621         if (r < 0)
 622                 return r;
 623
 624         r = manager_network_monitor_listen(m);
 625         if (r < 0)
 626                 return r;
 627
 628         r = manager_rtnl_listen(m);
 629         if (r < 0)
 630                 return r;
 631
 632         r = manager_connect_bus(m);
 633         if (r < 0)
 634                 return r;
 635
 636         (void) sd_event_add_signal(m->event, &m->sigusr1_event_source, SIGUSR1, manager_sigusr1, m);
 637         (void) sd_event_add_signal(m->event, &m->sigusr2_event_source, SIGUSR2, manager_sigusr2, m);
 638         (void) sd_event_add_signal(m->event, &m->sigrtmin1_event_source, SIGRTMIN+1, manager_sigrtmin1, m);
 639
 640         manager_cleanup_saved_user(m);
 641
 642         *ret = TAKE_PTR(m);
 643
 644         return 0;
 645 }
 646
 647 int manager_start(Manager *m) {
 648         int r;
 649
 650         assert(m);
 651
 652         r = manager_dns_stub_start(m);
 653         if (r < 0)
 654                 return r;
 655
 656         return 0;
 657 }
 658
 659 Manager *manager_free(Manager *m) {
 660         Link *l;
 661         DnssdService *s;
 662
 663         if (!m)
 664                 return NULL;
 665
 666         dns_server_unlink_all(m->dns_servers);
 667         dns_server_unlink_all(m->fallback_dns_servers);
 668         dns_search_domain_unlink_all(m->search_domains);
 669
 670         while ((l = hashmap_first(m->links)))
 671                link_free(l);
 672
 673         while (m->dns_queries)
 674                 dns_query_free(m->dns_queries);
 675
 676         dns_scope_free(m->unicast_scope);
 677
 678         /* At this point only orphaned streams should remain. All others should have been freed already by their
 679          * owners */
 680         while (m->dns_streams)
 681                 dns_stream_unref(m->dns_streams);
 682
 683         hashmap_free(m->links);
 684         hashmap_free(m->dns_transactions);
 685
 686         sd_event_source_unref(m->network_event_source);
 687         sd_network_monitor_unref(m->network_monitor);
 688
 689         sd_netlink_unref(m->rtnl);
 690         sd_event_source_unref(m->rtnl_event_source);
 691
 692         manager_llmnr_stop(m);
 693         manager_mdns_stop(m);
 694         manager_dns_stub_stop(m);
 695
 696         sd_bus_flush_close_unref(m->bus);
 697
 698         sd_event_source_unref(m->sigusr1_event_source);
 699         sd_event_source_unref(m->sigusr2_event_source);
 700         sd_event_source_unref(m->sigrtmin1_event_source);
 701
 702         sd_event_unref(m->event);
 703
 704         dns_resource_key_unref(m->llmnr_host_ipv4_key);
 705         dns_resource_key_unref(m->llmnr_host_ipv6_key);
 706         dns_resource_key_unref(m->mdns_host_ipv4_key);
 707         dns_resource_key_unref(m->mdns_host_ipv6_key);
 708
 709         sd_event_source_unref(m->hostname_event_source);
 710         safe_close(m->hostname_fd);
 711
 712         free(m->full_hostname);
 713         free(m->llmnr_hostname);
 714         free(m->mdns_hostname);
 715
 716         while ((s = hashmap_first(m->dnssd_services)))
 717                dnssd_service_free(s);
 718         hashmap_free(m->dnssd_services);
 719
 720         dns_trust_anchor_flush(&m->trust_anchor);
 721         manager_etc_hosts_flush(m);
 722
 723         return mfree(m);
 724 }
 725
 726 int manager_recv(Manager *m, int fd, DnsProtocol protocol, DnsPacket **ret) {
 727         _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL;
 728         union {
 729                 struct cmsghdr header; /* For alignment */
 730                 uint8_t buffer[CMSG_SPACE(MAXSIZE(struct in_pktinfo, struct in6_pktinfo))
 731                                + CMSG_SPACE(int) /* ttl/hoplimit */
 732                                + EXTRA_CMSG_SPACE /* kernel appears to require extra buffer space */];
 733         } control;
 734         union sockaddr_union sa;
 735         struct iovec iov;
 736         struct msghdr mh = {
 737                 .msg_name = &sa.sa,
 738                 .msg_namelen = sizeof(sa),
 739                 .msg_iov = &iov,
 740                 .msg_iovlen = 1,
 741                 .msg_control = &control,
 742                 .msg_controllen = sizeof(control),
 743         };
 744         struct cmsghdr *cmsg;
 745         ssize_t ms, l;
 746         int r;
 747
 748         assert(m);
 749         assert(fd >= 0);
 750         assert(ret);
 751
 752         ms = next_datagram_size_fd(fd);
 753         if (ms < 0)
 754                 return ms;
 755
 756         r = dns_packet_new(&p, protocol, ms, DNS_PACKET_SIZE_MAX);
 757         if (r < 0)
 758                 return r;
 759
 760         iov = IOVEC_MAKE(DNS_PACKET_DATA(p), p->allocated);
 761
 762         l = recvmsg(fd, &mh, 0);
 763         if (l < 0) {
 764                 if (IN_SET(errno, EAGAIN, EINTR))
 765                         return 0;
 766
 767                 return -errno;
 768         }
 769         if (l == 0)
 770                 return 0;
 771
 772         assert(!(mh.msg_flags & MSG_CTRUNC));
 773         assert(!(mh.msg_flags & MSG_TRUNC));
 774
 775         p->size = (size_t) l;
 776
 777         p->family = sa.sa.sa_family;
 778         p->ipproto = IPPROTO_UDP;
 779         if (p->family == AF_INET) {
 780                 p->sender.in = sa.in.sin_addr;
 781                 p->sender_port = be16toh(sa.in.sin_port);
 782         } else if (p->family == AF_INET6) {
 783                 p->sender.in6 = sa.in6.sin6_addr;
 784                 p->sender_port = be16toh(sa.in6.sin6_port);
 785                 p->ifindex = sa.in6.sin6_scope_id;
 786         } else
 787                 return -EAFNOSUPPORT;
 788
 789         CMSG_FOREACH(cmsg, &mh) {
 790
 791                 if (cmsg->cmsg_level == IPPROTO_IPV6) {
 792                         assert(p->family == AF_INET6);
 793
 794                         switch (cmsg->cmsg_type) {
 795
 796                         case IPV6_PKTINFO: {
 797                                 struct in6_pktinfo *i = (struct in6_pktinfo*) CMSG_DATA(cmsg);
 798
 799                                 if (p->ifindex <= 0)
 800                                         p->ifindex = i->ipi6_ifindex;
 801
 802                                 p->destination.in6 = i->ipi6_addr;
 803                                 break;
 804                         }
 805
 806                         case IPV6_HOPLIMIT:
 807                                 p->ttl = *(int *) CMSG_DATA(cmsg);
 808                                 break;
 809
 810                         }
 811                 } else if (cmsg->cmsg_level == IPPROTO_IP) {
 812                         assert(p->family == AF_INET);
 813
 814                         switch (cmsg->cmsg_type) {
 815
 816                         case IP_PKTINFO: {
 817                                 struct in_pktinfo *i = (struct in_pktinfo*) CMSG_DATA(cmsg);
 818
 819                                 if (p->ifindex <= 0)
 820                                         p->ifindex = i->ipi_ifindex;
 821
 822                                 p->destination.in = i->ipi_addr;
 823                                 break;
 824                         }
 825
 826                         case IP_TTL:
 827                                 p->ttl = *(int *) CMSG_DATA(cmsg);
 828                                 break;
 829                         }
 830                 }
 831         }
 832
 833         /* The Linux kernel sets the interface index to the loopback
 834          * device if the packet came from the local host since it
 835          * avoids the routing table in such a case. Let's unset the
 836          * interface index in such a case. */
 837         if (p->ifindex == LOOPBACK_IFINDEX)
 838                 p->ifindex = 0;
 839
 840         if (protocol != DNS_PROTOCOL_DNS) {
 841                 /* If we don't know the interface index still, we look for the
 842                  * first local interface with a matching address. Yuck! */
 843                 if (p->ifindex <= 0)
 844                         p->ifindex = manager_find_ifindex(m, p->family, &p->destination);
 845         }
 846
 847         *ret = TAKE_PTR(p);
 848
 849         return 1;
 850 }
 851
 852 static int sendmsg_loop(int fd, struct msghdr *mh, int flags) {
 853         int r;
 854
 855         assert(fd >= 0);
 856         assert(mh);
 857
 858         for (;;) {
 859                 if (sendmsg(fd, mh, flags) >= 0)
 860                         return 0;
 861
 862                 if (errno == EINTR)
 863                         continue;
 864
 865                 if (errno != EAGAIN)
 866                         return -errno;
 867
 868                 r = fd_wait_for_event(fd, POLLOUT, SEND_TIMEOUT_USEC);
 869                 if (r < 0)
 870                         return r;
 871                 if (r == 0)
 872                         return -ETIMEDOUT;
 873         }
 874 }
 875
 876 static int write_loop(int fd, void *message, size_t length) {
 877         int r;
 878
 879         assert(fd >= 0);
 880         assert(message);
 881
 882         for (;;) {
 883                 if (write(fd, message, length) >= 0)
 884                         return 0;
 885
 886                 if (errno == EINTR)
 887                         continue;
 888
 889                 if (errno != EAGAIN)
 890                         return -errno;
 891
 892                 r = fd_wait_for_event(fd, POLLOUT, SEND_TIMEOUT_USEC);
 893                 if (r < 0)
 894                         return r;
 895                 if (r == 0)
 896                         return -ETIMEDOUT;
 897         }
 898 }
 899
 900 int manager_write(Manager *m, int fd, DnsPacket *p) {
 901         int r;
 902
 903         log_debug("Sending %s packet with id %" PRIu16 ".", DNS_PACKET_QR(p) ? "response" : "query", DNS_PACKET_ID(p));
 904
 905         r = write_loop(fd, DNS_PACKET_DATA(p), p->size);
 906         if (r < 0)
 907                 return r;
 908
 909         return 0;
 910 }
 911
 912 static int manager_ipv4_send(
 913                 Manager *m,
 914                 int fd,
 915                 int ifindex,
 916                 const struct in_addr *destination,
 917                 uint16_t port,
 918                 const struct in_addr *source,
 919                 DnsPacket *p) {
 920         union {
 921                 struct cmsghdr header; /* For alignment */
 922                 uint8_t buffer[CMSG_SPACE(sizeof(struct in_pktinfo))];
 923         } control = {};
 924         union sockaddr_union sa;
 925         struct iovec iov;
 926         struct msghdr mh = {
 927                 .msg_iov = &iov,
 928                 .msg_iovlen = 1,
 929                 .msg_name = &sa.sa,
 930                 .msg_namelen = sizeof(sa.in),
 931         };
 932
 933         assert(m);
 934         assert(fd >= 0);
 935         assert(destination);
 936         assert(port > 0);
 937         assert(p);
 938
 939         iov = IOVEC_MAKE(DNS_PACKET_DATA(p), p->size);
 940
 941         sa = (union sockaddr_union) {
 942                 .in.sin_family = AF_INET,
 943                 .in.sin_addr = *destination,
 944                 .in.sin_port = htobe16(port),
 945         };
 946
 947         if (ifindex > 0) {
 948                 struct cmsghdr *cmsg;
 949                 struct in_pktinfo *pi;
 950
 951                 mh.msg_control = &control;
 952                 mh.msg_controllen = CMSG_LEN(sizeof(struct in_pktinfo));
 953
 954                 cmsg = CMSG_FIRSTHDR(&mh);
 955                 cmsg->cmsg_len = mh.msg_controllen;
 956                 cmsg->cmsg_level = IPPROTO_IP;
 957                 cmsg->cmsg_type = IP_PKTINFO;
 958
 959                 pi = (struct in_pktinfo*) CMSG_DATA(cmsg);
 960                 pi->ipi_ifindex = ifindex;
 961
 962                 if (source)
 963                         pi->ipi_spec_dst = *source;
 964         }
 965
 966         return sendmsg_loop(fd, &mh, 0);
 967 }
 968
 969 static int manager_ipv6_send(
 970                 Manager *m,
 971                 int fd,
 972                 int ifindex,
 973                 const struct in6_addr *destination,
 974                 uint16_t port,
 975                 const struct in6_addr *source,
 976                 DnsPacket *p) {
 977
 978         union {
 979                 struct cmsghdr header; /* For alignment */
 980                 uint8_t buffer[CMSG_SPACE(sizeof(struct in6_pktinfo))];
 981         } control = {};
 982         union sockaddr_union sa;
 983         struct iovec iov;
 984         struct msghdr mh = {
 985                 .msg_iov = &iov,
 986                 .msg_iovlen = 1,
 987                 .msg_name = &sa.sa,
 988                 .msg_namelen = sizeof(sa.in6),
 989         };
 990
 991         assert(m);
 992         assert(fd >= 0);
 993         assert(destination);
 994         assert(port > 0);
 995         assert(p);
 996
 997         iov = IOVEC_MAKE(DNS_PACKET_DATA(p), p->size);
 998
 999         sa = (union sockaddr_union) {
1000                 .in6.sin6_family = AF_INET6,
1001                 .in6.sin6_addr = *destination,
1002                 .in6.sin6_port = htobe16(port),
1003                 .in6.sin6_scope_id = ifindex,
1004         };
1005
1006         if (ifindex > 0) {
1007                 struct cmsghdr *cmsg;
1008                 struct in6_pktinfo *pi;
1009
1010                 mh.msg_control = &control;
1011                 mh.msg_controllen = CMSG_LEN(sizeof(struct in6_pktinfo));
1012
1013                 cmsg = CMSG_FIRSTHDR(&mh);
1014                 cmsg->cmsg_len = mh.msg_controllen;
1015                 cmsg->cmsg_level = IPPROTO_IPV6;
1016                 cmsg->cmsg_type = IPV6_PKTINFO;
1017
1018                 pi = (struct in6_pktinfo*) CMSG_DATA(cmsg);
1019                 pi->ipi6_ifindex = ifindex;
1020
1021                 if (source)
1022                         pi->ipi6_addr = *source;
1023         }
1024
1025         return sendmsg_loop(fd, &mh, 0);
1026 }
1027
1028 int manager_send(
1029                 Manager *m,
1030                 int fd,
1031                 int ifindex,
1032                 int family,
1033                 const union in_addr_union *destination,
1034                 uint16_t port,
1035                 const union in_addr_union *source,
1036                 DnsPacket *p) {
1037
1038         assert(m);
1039         assert(fd >= 0);
1040         assert(destination);
1041         assert(port > 0);
1042         assert(p);
1043
1044         log_debug("Sending %s packet with id %" PRIu16 " on interface %i/%s.", DNS_PACKET_QR(p) ? "response" : "query", DNS_PACKET_ID(p), ifindex, af_to_name(family));
1045
1046         if (family == AF_INET)
1047                 return manager_ipv4_send(m, fd, ifindex, &destination->in, port, source ? &source->in : NULL, p);
1048         if (family == AF_INET6)
1049                 return manager_ipv6_send(m, fd, ifindex, &destination->in6, port, source ? &source->in6 : NULL, p);
1050
1051         return -EAFNOSUPPORT;
1052 }
1053
1054 uint32_t manager_find_mtu(Manager *m) {
1055         uint32_t mtu = 0;
1056         Link *l;
1057         Iterator i;
1058
1059         /* If we don't know on which link a DNS packet would be
1060          * delivered, let's find the largest MTU that works on all
1061          * interfaces we know of */
1062
1063         HASHMAP_FOREACH(l, m->links, i) {
1064                 if (l->mtu <= 0)
1065                         continue;
1066
1067                 if (mtu <= 0 || l->mtu < mtu)
1068                         mtu = l->mtu;
1069         }
1070
1071         return mtu;
1072 }
1073
1074 int manager_find_ifindex(Manager *m, int family, const union in_addr_union *in_addr) {
1075         LinkAddress *a;
1076
1077         assert(m);
1078
1079         a = manager_find_link_address(m, family, in_addr);
1080         if (a)
1081                 return a->link->ifindex;
1082
1083         return 0;
1084 }
1085
1086 void manager_refresh_rrs(Manager *m) {
1087         Iterator i;
1088         Link *l;
1089         DnssdService *s;
1090
1091         assert(m);
1092
1093         m->llmnr_host_ipv4_key = dns_resource_key_unref(m->llmnr_host_ipv4_key);
1094         m->llmnr_host_ipv6_key = dns_resource_key_unref(m->llmnr_host_ipv6_key);
1095         m->mdns_host_ipv4_key = dns_resource_key_unref(m->mdns_host_ipv4_key);
1096         m->mdns_host_ipv6_key = dns_resource_key_unref(m->mdns_host_ipv6_key);
1097
1098         if (m->mdns_support == RESOLVE_SUPPORT_YES)
1099                 HASHMAP_FOREACH(s, m->dnssd_services, i)
1100                         if (dnssd_update_rrs(s) < 0)
1101                                 log_warning("Failed to refresh DNS-SD service '%s'", s->name);
1102
1103         HASHMAP_FOREACH(l, m->links, i) {
1104                 link_add_rrs(l, true);
1105                 link_add_rrs(l, false);
1106         }
1107 }
1108
1109 static int manager_next_random_name(const char *old, char **ret_new) {
1110         const char *p;
1111         uint64_t u, a;
1112         char *n;
1113
1114         p = strchr(old, 0);
1115         assert(p);
1116
1117         while (p > old) {
1118                 if (!strchr(DIGITS, p[-1]))
1119                         break;
1120
1121                 p--;
1122         }
1123
1124         if (*p == 0 || safe_atou64(p, &u) < 0 || u <= 0)
1125                 u = 1;
1126
1127         /* Add a random number to the old value. This way we can avoid
1128          * that two hosts pick the same hostname, win on IPv4 and lose
1129          * on IPv6 (or vice versa), and pick the same hostname
1130          * replacement hostname, ad infinitum. We still want the
1131          * numbers to go up monotonically, hence we just add a random
1132          * value 1..10 */
1133
1134         random_bytes(&a, sizeof(a));
1135         u += 1 + a % 10;
1136
1137         if (asprintf(&n, "%.*s%" PRIu64, (int) (p - old), old, u) < 0)
1138                 return -ENOMEM;
1139
1140         *ret_new = n;
1141
1142         return 0;
1143 }
1144
1145 int manager_next_hostname(Manager *m) {
1146         _cleanup_free_ char *h = NULL, *k = NULL;
1147         int r;
1148
1149         assert(m);
1150
1151         r = manager_next_random_name(m->llmnr_hostname, &h);
1152         if (r < 0)
1153                 return r;
1154
1155         r = dns_name_concat(h, "local", 0, &k);
1156         if (r < 0)
1157                 return r;
1158
1159         log_info("Hostname conflict, changing published hostname from '%s' to '%s'.", m->llmnr_hostname, h);
1160
1161         free_and_replace(m->llmnr_hostname, h);
1162         free_and_replace(m->mdns_hostname, k);
1163
1164         manager_refresh_rrs(m);
1165
1166         return 0;
1167 }
1168
1169 LinkAddress* manager_find_link_address(Manager *m, int family, const union in_addr_union *in_addr) {
1170         Iterator i;
1171         Link *l;
1172
1173         assert(m);
1174
1175         HASHMAP_FOREACH(l, m->links, i) {
1176                 LinkAddress *a;
1177
1178                 a = link_find_address(l, family, in_addr);
1179                 if (a)
1180                         return a;
1181         }
1182
1183         return NULL;
1184 }
1185
1186 bool manager_our_packet(Manager *m, DnsPacket *p) {
1187         assert(m);
1188         assert(p);
1189
1190         return !!manager_find_link_address(m, p->family, &p->sender);
1191 }
1192
1193 DnsScope* manager_find_scope(Manager *m, DnsPacket *p) {
1194         Link *l;
1195
1196         assert(m);
1197         assert(p);
1198
1199         l = hashmap_get(m->links, INT_TO_PTR(p->ifindex));
1200         if (!l)
1201                 return NULL;
1202
1203         switch (p->protocol) {
1204         case DNS_PROTOCOL_LLMNR:
1205                 if (p->family == AF_INET)
1206                         return l->llmnr_ipv4_scope;
1207                 else if (p->family == AF_INET6)
1208                         return l->llmnr_ipv6_scope;
1209
1210                 break;
1211
1212         case DNS_PROTOCOL_MDNS:
1213                 if (p->family == AF_INET)
1214                         return l->mdns_ipv4_scope;
1215                 else if (p->family == AF_INET6)
1216                         return l->mdns_ipv6_scope;
1217
1218                 break;
1219
1220         default:
1221                 break;
1222         }
1223
1224         return NULL;
1225 }
1226
1227 void manager_verify_all(Manager *m) {
1228         DnsScope *s;
1229
1230         assert(m);
1231
1232         LIST_FOREACH(scopes, s, m->dns_scopes)
1233                 dns_zone_verify_all(&s->zone);
1234 }
1235
1236 int manager_is_own_hostname(Manager *m, const char *name) {
1237         int r;
1238
1239         assert(m);
1240         assert(name);
1241
1242         if (m->llmnr_hostname) {
1243                 r = dns_name_equal(name, m->llmnr_hostname);
1244                 if (r != 0)
1245                         return r;
1246         }
1247
1248         if (m->mdns_hostname) {
1249                 r = dns_name_equal(name, m->mdns_hostname);
1250                 if (r != 0)
1251                         return r;
1252         }
1253
1254         if (m->full_hostname)
1255                 return dns_name_equal(name, m->full_hostname);
1256
1257         return 0;
1258 }
1259
1260 int manager_compile_dns_servers(Manager *m, OrderedSet **dns) {
1261         DnsServer *s;
1262         Iterator i;
1263         Link *l;
1264         int r;
1265
1266         assert(m);
1267         assert(dns);
1268
1269         r = ordered_set_ensure_allocated(dns, &dns_server_hash_ops);
1270         if (r < 0)
1271                 return r;
1272
1273         /* First add the system-wide servers and domains */
1274         LIST_FOREACH(servers, s, m->dns_servers) {
1275                 r = ordered_set_put(*dns, s);
1276                 if (r == -EEXIST)
1277                         continue;
1278                 if (r < 0)
1279                         return r;
1280         }
1281
1282         /* Then, add the per-link servers */
1283         HASHMAP_FOREACH(l, m->links, i) {
1284                 LIST_FOREACH(servers, s, l->dns_servers) {
1285                         r = ordered_set_put(*dns, s);
1286                         if (r == -EEXIST)
1287                                 continue;
1288                         if (r < 0)
1289                                 return r;
1290                 }
1291         }
1292
1293         /* If we found nothing, add the fallback servers */
1294         if (ordered_set_isempty(*dns)) {
1295                 LIST_FOREACH(servers, s, m->fallback_dns_servers) {
1296                         r = ordered_set_put(*dns, s);
1297                         if (r == -EEXIST)
1298                                 continue;
1299                         if (r < 0)
1300                                 return r;
1301                 }
1302         }
1303
1304         return 0;
1305 }
1306
1307 /* filter_route is a tri-state:
1308  *   < 0: no filtering
1309  *   = 0 or false: return only domains which should be used for searching
1310  *   > 0 or true: return only domains which are for routing only
1311  */
1312 int manager_compile_search_domains(Manager *m, OrderedSet **domains, int filter_route) {
1313         DnsSearchDomain *d;
1314         Iterator i;
1315         Link *l;
1316         int r;
1317
1318         assert(m);
1319         assert(domains);
1320
1321         r = ordered_set_ensure_allocated(domains, &dns_name_hash_ops);
1322         if (r < 0)
1323                 return r;
1324
1325         LIST_FOREACH(domains, d, m->search_domains) {
1326
1327                 if (filter_route >= 0 &&
1328                     d->route_only != !!filter_route)
1329                         continue;
1330
1331                 r = ordered_set_put(*domains, d->name);
1332                 if (r == -EEXIST)
1333                         continue;
1334                 if (r < 0)
1335                         return r;
1336         }
1337
1338         HASHMAP_FOREACH(l, m->links, i) {
1339
1340                 LIST_FOREACH(domains, d, l->search_domains) {
1341
1342                         if (filter_route >= 0 &&
1343                             d->route_only != !!filter_route)
1344                                 continue;
1345
1346                         r = ordered_set_put(*domains, d->name);
1347                         if (r == -EEXIST)
1348                                 continue;
1349                         if (r < 0)
1350                                 return r;
1351                 }
1352         }
1353
1354         return 0;
1355 }
1356
1357 DnssecMode manager_get_dnssec_mode(Manager *m) {
1358         assert(m);
1359
1360         if (m->dnssec_mode != _DNSSEC_MODE_INVALID)
1361                 return m->dnssec_mode;
1362
1363         return DNSSEC_NO;
1364 }
1365
1366 bool manager_dnssec_supported(Manager *m) {
1367         DnsServer *server;
1368         Iterator i;
1369         Link *l;
1370
1371         assert(m);
1372
1373         if (manager_get_dnssec_mode(m) == DNSSEC_NO)
1374                 return false;
1375
1376         server = manager_get_dns_server(m);
1377         if (server && !dns_server_dnssec_supported(server))
1378                 return false;
1379
1380         HASHMAP_FOREACH(l, m->links, i)
1381                 if (!link_dnssec_supported(l))
1382                         return false;
1383
1384         return true;
1385 }
1386
1387 DnsOverTlsMode manager_get_dns_over_tls_mode(Manager *m) {
1388         assert(m);
1389
1390         if (m->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
1391                 return m->dns_over_tls_mode;
1392
1393         return DNS_OVER_TLS_NO;
1394 }
1395
1396 void manager_dnssec_verdict(Manager *m, DnssecVerdict verdict, const DnsResourceKey *key) {
1397
1398         assert(verdict >= 0);
1399         assert(verdict < _DNSSEC_VERDICT_MAX);
1400
1401         if (DEBUG_LOGGING) {
1402                 char s[DNS_RESOURCE_KEY_STRING_MAX];
1403
1404                 log_debug("Found verdict for lookup %s: %s",
1405                           dns_resource_key_to_string(key, s, sizeof s),
1406                           dnssec_verdict_to_string(verdict));
1407         }
1408
1409         m->n_dnssec_verdict[verdict]++;
1410 }
1411
1412 bool manager_routable(Manager *m, int family) {
1413         Iterator i;
1414         Link *l;
1415
1416         assert(m);
1417
1418         /* Returns true if the host has at least one interface with a routable address of the specified type */
1419
1420         HASHMAP_FOREACH(l, m->links, i)
1421                 if (link_relevant(l, family, false))
1422                         return true;
1423
1424         return false;
1425 }
1426
1427 void manager_flush_caches(Manager *m) {
1428         DnsScope *scope;
1429
1430         assert(m);
1431
1432         LIST_FOREACH(scopes, scope, m->dns_scopes)
1433                 dns_cache_flush(&scope->cache);
1434
1435         log_info("Flushed all caches.");
1436 }
1437
1438 void manager_reset_server_features(Manager *m) {
1439         Iterator i;
1440         Link *l;
1441
1442         dns_server_reset_features_all(m->dns_servers);
1443         dns_server_reset_features_all(m->fallback_dns_servers);
1444
1445         HASHMAP_FOREACH(l, m->links, i)
1446                 dns_server_reset_features_all(l->dns_servers);
1447
1448         log_info("Resetting learnt feature levels on all servers.");
1449 }
1450
1451 void manager_cleanup_saved_user(Manager *m) {
1452         _cleanup_closedir_ DIR *d = NULL;
1453         struct dirent *de;
1454         int r;
1455
1456         assert(m);
1457
1458         /* Clean up all saved per-link files in /run/systemd/resolve/netif/ that don't have a matching interface
1459          * anymore. These files are created to persist settings pushed in by the user via the bus, so that resolved can
1460          * be restarted without losing this data. */
1461
1462         d = opendir("/run/systemd/resolve/netif/");
1463         if (!d) {
1464                 if (errno == ENOENT)
1465                         return;
1466
1467                 log_warning_errno(errno, "Failed to open interface directory: %m");
1468                 return;
1469         }
1470
1471         FOREACH_DIRENT_ALL(de, d, log_error_errno(errno, "Failed to read interface directory: %m")) {
1472                 _cleanup_free_ char *p = NULL;
1473                 int ifindex;
1474                 Link *l;
1475
1476                 if (!IN_SET(de->d_type, DT_UNKNOWN, DT_REG))
1477                         continue;
1478
1479                 if (dot_or_dot_dot(de->d_name))
1480                         continue;
1481
1482                 r = parse_ifindex(de->d_name, &ifindex);
1483                 if (r < 0) /* Probably some temporary file from a previous run. Delete it */
1484                         goto rm;
1485
1486                 l = hashmap_get(m->links, INT_TO_PTR(ifindex));
1487                 if (!l) /* link vanished */
1488                         goto rm;
1489
1490                 if (l->is_managed) /* now managed by networkd, hence the bus settings are useless */
1491                         goto rm;
1492
1493                 continue;
1494
1495         rm:
1496                 p = strappend("/run/systemd/resolve/netif/", de->d_name);
1497                 if (!p) {
1498                         log_oom();
1499                         return;
1500                 }
1501
1502                 (void) unlink(p);
1503         }
1504 }
1505
1506 bool manager_next_dnssd_names(Manager *m) {
1507         Iterator i;
1508         DnssdService *s;
1509         bool tried = false;
1510         int r;
1511
1512         assert(m);
1513
1514         HASHMAP_FOREACH(s, m->dnssd_services, i) {
1515                 _cleanup_free_ char * new_name = NULL;
1516
1517                 if (!s->withdrawn)
1518                         continue;
1519
1520                 r = manager_next_random_name(s->name_template, &new_name);
1521                 if (r < 0) {
1522                         log_warning_errno(r, "Failed to get new name for service '%s': %m", s->name);
1523                         continue;
1524                 }
1525
1526                 free_and_replace(s->name_template, new_name);
1527
1528                 s->withdrawn = false;
1529
1530                 tried = true;
1531         }
1532
1533         if (tried)
1534                 manager_refresh_rrs(m);
1535
1536         return tried;
1537 }