src/resolve/resolved-manager.c

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