src/resolve/resolved-manager.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 /***
   3   Copyright © 2014 Tom Gundersen <teg@jklm.no>
   4  ***/
   5
   6 #include <netinet/in.h>
   7 #include <poll.h>
   8 #include <stdio_ext.h>
   9 #include <sys/ioctl.h>
  10
  11 #if HAVE_LIBIDN2
  12 #include <idn2.h>
  13 #endif
  14
  15 #include "af-list.h"
  16 #include "alloc-util.h"
  17 #include "dirent-util.h"
  18 #include "dns-domain.h"
  19 #include "fd-util.h"
  20 #include "fileio-label.h"
  21 #include "hostname-util.h"
  22 #include "io-util.h"
  23 #include "netlink-util.h"
  24 #include "network-internal.h"
  25 #include "ordered-set.h"
  26 #include "parse-util.h"
  27 #include "random-util.h"
  28 #include "resolved-bus.h"
  29 #include "resolved-conf.h"
  30 #include "resolved-dnssd.h"
  31 #include "resolved-dns-stub.h"
  32 #include "resolved-etc-hosts.h"
  33 #include "resolved-llmnr.h"
  34 #include "resolved-manager.h"
  35 #include "resolved-mdns.h"
  36 #include "resolved-resolv-conf.h"
  37 #include "socket-util.h"
  38 #include "string-table.h"
  39 #include "string-util.h"
  40 #include "utf8.h"
  41
  42 #define SEND_TIMEOUT_USEC (200 * USEC_PER_MSEC)
  43
  44 static int manager_process_link(sd_netlink *rtnl, sd_netlink_message *mm, void *userdata) {
  45         Manager *m = userdata;
  46         uint16_t type;
  47         Link *l;
  48         int ifindex, r;
  49
  50         assert(rtnl);
  51         assert(m);
  52         assert(mm);
  53
  54         r = sd_netlink_message_get_type(mm, &type);
  55         if (r < 0)
  56                 goto fail;
  57
  58         r = sd_rtnl_message_link_get_ifindex(mm, &ifindex);
  59         if (r < 0)
  60                 goto fail;
  61
  62         l = hashmap_get(m->links, INT_TO_PTR(ifindex));
  63
  64         switch (type) {
  65
  66         case RTM_NEWLINK:{
  67                 bool is_new = !l;
  68
  69                 if (!l) {
  70                         r = link_new(m, &l, ifindex);
  71                         if (r < 0)
  72                                 goto fail;
  73                 }
  74
  75                 r = link_process_rtnl(l, mm);
  76                 if (r < 0)
  77                         goto fail;
  78
  79                 r = link_update(l);
  80                 if (r < 0)
  81                         goto fail;
  82
  83                 if (is_new)
  84                         log_debug("Found new link %i/%s", ifindex, l->name);
  85
  86                 break;
  87         }
  88
  89         case RTM_DELLINK:
  90                 if (l) {
  91                         log_debug("Removing link %i/%s", l->ifindex, l->name);
  92                         link_remove_user(l);
  93                         link_free(l);
  94                 }
  95
  96                 break;
  97         }
  98
  99         return 0;
 100
 101 fail:
 102         log_warning_errno(r, "Failed to process RTNL link message: %m");
 103         return 0;
 104 }
 105
 106 static int manager_process_address(sd_netlink *rtnl, sd_netlink_message *mm, void *userdata) {
 107         Manager *m = userdata;
 108         union in_addr_union address;
 109         uint16_t type;
 110         int r, ifindex, family;
 111         LinkAddress *a;
 112         Link *l;
 113
 114         assert(rtnl);
 115         assert(mm);
 116         assert(m);
 117
 118         r = sd_netlink_message_get_type(mm, &type);
 119         if (r < 0)
 120                 goto fail;
 121
 122         r = sd_rtnl_message_addr_get_ifindex(mm, &ifindex);
 123         if (r < 0)
 124                 goto fail;
 125
 126         l = hashmap_get(m->links, INT_TO_PTR(ifindex));
 127         if (!l)
 128                 return 0;
 129
 130         r = sd_rtnl_message_addr_get_family(mm, &family);
 131         if (r < 0)
 132                 goto fail;
 133
 134         switch (family) {
 135
 136         case AF_INET:
 137                 r = sd_netlink_message_read_in_addr(mm, IFA_LOCAL, &address.in);
 138                 if (r < 0) {
 139                         r = sd_netlink_message_read_in_addr(mm, IFA_ADDRESS, &address.in);
 140                         if (r < 0)
 141                                 goto fail;
 142                 }
 143
 144                 break;
 145
 146         case AF_INET6:
 147                 r = sd_netlink_message_read_in6_addr(mm, IFA_LOCAL, &address.in6);
 148                 if (r < 0) {
 149                         r = sd_netlink_message_read_in6_addr(mm, IFA_ADDRESS, &address.in6);
 150                         if (r < 0)
 151                                 goto fail;
 152                 }
 153
 154                 break;
 155
 156         default:
 157                 return 0;
 158         }
 159
 160         a = link_find_address(l, family, &address);
 161
 162         switch (type) {
 163
 164         case RTM_NEWADDR:
 165
 166                 if (!a) {
 167                         r = link_address_new(l, &a, family, &address);
 168                         if (r < 0)
 169                                 return r;
 170                 }
 171
 172                 r = link_address_update_rtnl(a, mm);
 173                 if (r < 0)
 174                         return r;
 175
 176                 break;
 177
 178         case RTM_DELADDR:
 179                 link_address_free(a);
 180                 break;
 181         }
 182
 183         return 0;
 184
 185 fail:
 186         log_warning_errno(r, "Failed to process RTNL address message: %m");
 187         return 0;
 188 }
 189
 190 static int manager_rtnl_listen(Manager *m) {
 191         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL;
 192         sd_netlink_message *i;
 193         int r;
 194
 195         assert(m);
 196
 197         /* First, subscribe to interfaces coming and going */
 198         r = sd_netlink_open(&m->rtnl);
 199         if (r < 0)
 200                 return r;
 201
 202         r = sd_netlink_attach_event(m->rtnl, m->event, SD_EVENT_PRIORITY_IMPORTANT);
 203         if (r < 0)
 204                 return r;
 205
 206         r = sd_netlink_add_match(m->rtnl, RTM_NEWLINK, manager_process_link, m);
 207         if (r < 0)
 208                 return r;
 209
 210         r = sd_netlink_add_match(m->rtnl, RTM_DELLINK, manager_process_link, m);
 211         if (r < 0)
 212                 return r;
 213
 214         r = sd_netlink_add_match(m->rtnl, RTM_NEWADDR, manager_process_address, m);
 215         if (r < 0)
 216                 return r;
 217
 218         r = sd_netlink_add_match(m->rtnl, RTM_DELADDR, manager_process_address, m);
 219         if (r < 0)
 220                 return r;
 221
 222         /* Then, enumerate all links */
 223         r = sd_rtnl_message_new_link(m->rtnl, &req, RTM_GETLINK, 0);
 224         if (r < 0)
 225                 return r;
 226
 227         r = sd_netlink_message_request_dump(req, true);
 228         if (r < 0)
 229                 return r;
 230
 231         r = sd_netlink_call(m->rtnl, req, 0, &reply);
 232         if (r < 0)
 233                 return r;
 234
 235         for (i = reply; i; i = sd_netlink_message_next(i)) {
 236                 r = manager_process_link(m->rtnl, i, m);
 237                 if (r < 0)
 238                         return r;
 239         }
 240
 241         req = sd_netlink_message_unref(req);
 242         reply = sd_netlink_message_unref(reply);
 243
 244         /* Finally, enumerate all addresses, too */
 245         r = sd_rtnl_message_new_addr(m->rtnl, &req, RTM_GETADDR, 0, AF_UNSPEC);
 246         if (r < 0)
 247                 return r;
 248
 249         r = sd_netlink_message_request_dump(req, true);
 250         if (r < 0)
 251                 return r;
 252
 253         r = sd_netlink_call(m->rtnl, req, 0, &reply);
 254         if (r < 0)
 255                 return r;
 256
 257         for (i = reply; i; i = sd_netlink_message_next(i)) {
 258                 r = manager_process_address(m->rtnl, i, m);
 259                 if (r < 0)
 260                         return r;
 261         }
 262
 263         return r;
 264 }
 265
 266 static int on_network_event(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
 267         Manager *m = userdata;
 268         Iterator i;
 269         Link *l;
 270         int r;
 271
 272         assert(m);
 273
 274         sd_network_monitor_flush(m->network_monitor);
 275
 276         HASHMAP_FOREACH(l, m->links, i) {
 277                 r = link_update(l);
 278                 if (r < 0)
 279                         log_warning_errno(r, "Failed to update monitor information for %i: %m", l->ifindex);
 280         }
 281
 282         (void) manager_write_resolv_conf(m);
 283
 284         return 0;
 285 }
 286
 287 static int manager_network_monitor_listen(Manager *m) {
 288         int r, fd, events;
 289
 290         assert(m);
 291
 292         r = sd_network_monitor_new(&m->network_monitor, NULL);
 293         if (r < 0)
 294                 return r;
 295
 296         fd = sd_network_monitor_get_fd(m->network_monitor);
 297         if (fd < 0)
 298                 return fd;
 299
 300         events = sd_network_monitor_get_events(m->network_monitor);
 301         if (events < 0)
 302                 return events;
 303
 304         r = sd_event_add_io(m->event, &m->network_event_source, fd, events, &on_network_event, m);
 305         if (r < 0)
 306                 return r;
 307
 308         r = sd_event_source_set_priority(m->network_event_source, SD_EVENT_PRIORITY_IMPORTANT+5);
 309         if (r < 0)
 310                 return r;
 311
 312         (void) sd_event_source_set_description(m->network_event_source, "network-monitor");
 313
 314         return 0;
 315 }
 316
 317 static int determine_hostname(char **full_hostname, char **llmnr_hostname, char **mdns_hostname) {
 318         _cleanup_free_ char *h = NULL, *n = NULL;
 319 #if HAVE_LIBIDN2
 320         _cleanup_free_ char *utf8 = NULL;
 321 #elif HAVE_LIBIDN
 322         int k;
 323 #endif
 324         char label[DNS_LABEL_MAX];
 325         const char *p, *decoded;
 326         int r;
 327
 328         assert(full_hostname);
 329         assert(llmnr_hostname);
 330         assert(mdns_hostname);
 331
 332         /* Extract and normalize the first label of the locally configured hostname, and check it's not "localhost". */
 333
 334         r = gethostname_strict(&h);
 335         if (r < 0)
 336                 return log_debug_errno(r, "Can't determine system hostname: %m");
 337
 338         p = h;
 339         r = dns_label_unescape(&p, label, sizeof label);
 340         if (r < 0)
 341                 return log_error_errno(r, "Failed to unescape host name: %m");
 342         if (r == 0) {
 343                 log_error("Couldn't find a single label in hostname.");
 344                 return -EINVAL;
 345         }
 346
 347 #if HAVE_LIBIDN2
 348         r = idn2_to_unicode_8z8z(label, &utf8, 0);
 349         if (r != IDN2_OK)
 350                 return log_error("Failed to undo IDNA: %s", idn2_strerror(r));
 351         assert(utf8_is_valid(utf8));
 352
 353         r = strlen(utf8);
 354         decoded = utf8;
 355 #elif HAVE_LIBIDN
 356         k = dns_label_undo_idna(label, r, label, sizeof label);
 357         if (k < 0)
 358                 return log_error_errno(k, "Failed to undo IDNA: %m");
 359         if (k > 0)
 360                 r = k;
 361
 362         if (!utf8_is_valid(label)) {
 363                 log_error("System hostname is not UTF-8 clean.");
 364                 return -EINVAL;
 365         }
 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                 log_debug("System hostname is 'localhost', ignoring.");
 377                 return -EINVAL;
 378         }
 379
 380         r = dns_name_concat(n, "local", mdns_hostname);
 381         if (r < 0)
 382                 return log_error_errno(r, "Failed to determine mDNS hostname: %m");
 383
 384         *llmnr_hostname = TAKE_PTR(n);
 385         *full_hostname = TAKE_PTR(h);
 386
 387         return 0;
 388 }
 389
 390 static const char *fallback_hostname(void) {
 391
 392         /* Determine the fall back hostname. For exposing this system to the outside world, we cannot have it to be
 393          * "localhost" even if that's the compiled in hostname. In this case, let's revert to "linux" instead. */
 394
 395         if (is_localhost(FALLBACK_HOSTNAME))
 396                 return "linux";
 397
 398         return FALLBACK_HOSTNAME;
 399 }
 400
 401 static int make_fallback_hostnames(char **full_hostname, char **llmnr_hostname, char **mdns_hostname) {
 402         _cleanup_free_ char *n = NULL, *m = NULL;
 403         char label[DNS_LABEL_MAX], *h;
 404         const char *p;
 405         int r;
 406
 407         assert(full_hostname);
 408         assert(llmnr_hostname);
 409         assert(mdns_hostname);
 410
 411         p = fallback_hostname();
 412         r = dns_label_unescape(&p, label, sizeof(label));
 413         if (r < 0)
 414                 return log_error_errno(r, "Failed to unescape fallback host name: %m");
 415
 416         assert(r > 0); /* The fallback hostname must have at least one label */
 417
 418         r = dns_label_escape_new(label, r, &n);
 419         if (r < 0)
 420                 return log_error_errno(r, "Failed to escape fallback hostname: %m");
 421
 422         r = dns_name_concat(n, "local", &m);
 423         if (r < 0)
 424                 return log_error_errno(r, "Failed to concatenate mDNS hostname: %m");
 425
 426         h = strdup(fallback_hostname());
 427         if (!h)
 428                 return log_oom();
 429
 430         *llmnr_hostname = TAKE_PTR(n);
 431         *mdns_hostname = TAKE_PTR(m);
 432
 433         *full_hostname = h;
 434
 435         return 0;
 436 }
 437
 438 static int on_hostname_change(sd_event_source *es, int fd, uint32_t revents, void *userdata) {
 439         _cleanup_free_ char *full_hostname = NULL, *llmnr_hostname = NULL, *mdns_hostname = NULL;
 440         Manager *m = userdata;
 441         int r;
 442
 443         assert(m);
 444
 445         r = determine_hostname(&full_hostname, &llmnr_hostname, &mdns_hostname);
 446         if (r < 0)
 447                 return 0; /* ignore invalid hostnames */
 448
 449         if (streq(full_hostname, m->full_hostname) &&
 450             streq(llmnr_hostname, m->llmnr_hostname) &&
 451             streq(mdns_hostname, m->mdns_hostname))
 452                 return 0;
 453
 454         log_info("System hostname changed to '%s'.", full_hostname);
 455
 456         free_and_replace(m->full_hostname, full_hostname);
 457         free_and_replace(m->llmnr_hostname, llmnr_hostname);
 458         free_and_replace(m->mdns_hostname, mdns_hostname);
 459
 460         manager_refresh_rrs(m);
 461
 462         return 0;
 463 }
 464
 465 static int manager_watch_hostname(Manager *m) {
 466         int r;
 467
 468         assert(m);
 469
 470         m->hostname_fd = open("/proc/sys/kernel/hostname",
 471                               O_RDONLY|O_CLOEXEC|O_NONBLOCK|O_NOCTTY);
 472         if (m->hostname_fd < 0) {
 473                 log_warning_errno(errno, "Failed to watch hostname: %m");
 474                 return 0;
 475         }
 476
 477         r = sd_event_add_io(m->event, &m->hostname_event_source, m->hostname_fd, 0, on_hostname_change, m);
 478         if (r < 0) {
 479                 if (r == -EPERM)
 480                         /* kernels prior to 3.2 don't support polling this file. Ignore the failure. */
 481                         m->hostname_fd = safe_close(m->hostname_fd);
 482                 else
 483                         return log_error_errno(r, "Failed to add hostname event source: %m");
 484         }
 485
 486         (void) sd_event_source_set_description(m->hostname_event_source, "hostname");
 487
 488         r = determine_hostname(&m->full_hostname, &m->llmnr_hostname, &m->mdns_hostname);
 489         if (r < 0) {
 490                 log_info("Defaulting to hostname '%s'.", fallback_hostname());
 491
 492                 r = make_fallback_hostnames(&m->full_hostname, &m->llmnr_hostname, &m->mdns_hostname);
 493                 if (r < 0)
 494                         return r;
 495         } else
 496                 log_info("Using system hostname '%s'.", m->full_hostname);
 497
 498         return 0;
 499 }
 500
 501 static int manager_sigusr1(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
 502         _cleanup_free_ char *buffer = NULL;
 503         _cleanup_fclose_ FILE *f = NULL;
 504         Manager *m = userdata;
 505         DnsServer *server;
 506         size_t size = 0;
 507         DnsScope *scope;
 508         Iterator i;
 509         Link *l;
 510
 511         assert(s);
 512         assert(si);
 513         assert(m);
 514
 515         f = open_memstream(&buffer, &size);
 516         if (!f)
 517                 return log_oom();
 518
 519         (void) __fsetlocking(f, FSETLOCKING_BYCALLER);
 520
 521         LIST_FOREACH(scopes, scope, m->dns_scopes)
 522                 dns_scope_dump(scope, f);
 523
 524         LIST_FOREACH(servers, server, m->dns_servers)
 525                 dns_server_dump(server, f);
 526         LIST_FOREACH(servers, server, m->fallback_dns_servers)
 527                 dns_server_dump(server, f);
 528         HASHMAP_FOREACH(l, m->links, i)
 529                 LIST_FOREACH(servers, server, l->dns_servers)
 530                         dns_server_dump(server, f);
 531
 532         if (fflush_and_check(f) < 0)
 533                 return log_oom();
 534
 535         log_dump(LOG_INFO, buffer);
 536         return 0;
 537 }
 538
 539 static int manager_sigusr2(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
 540         Manager *m = userdata;
 541
 542         assert(s);
 543         assert(si);
 544         assert(m);
 545
 546         manager_flush_caches(m);
 547
 548         return 0;
 549 }
 550
 551 static int manager_sigrtmin1(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
 552         Manager *m = userdata;
 553
 554         assert(s);
 555         assert(si);
 556         assert(m);
 557
 558         manager_reset_server_features(m);
 559         return 0;
 560 }
 561
 562 int manager_new(Manager **ret) {
 563         _cleanup_(manager_freep) Manager *m = NULL;
 564         int r;
 565
 566         assert(ret);
 567
 568         m = new0(Manager, 1);
 569         if (!m)
 570                 return -ENOMEM;
 571
 572         m->llmnr_ipv4_udp_fd = m->llmnr_ipv6_udp_fd = -1;
 573         m->llmnr_ipv4_tcp_fd = m->llmnr_ipv6_tcp_fd = -1;
 574         m->mdns_ipv4_fd = m->mdns_ipv6_fd = -1;
 575         m->dns_stub_udp_fd = m->dns_stub_tcp_fd = -1;
 576         m->hostname_fd = -1;
 577
 578         m->llmnr_support = RESOLVE_SUPPORT_YES;
 579         m->mdns_support = RESOLVE_SUPPORT_YES;
 580         m->dnssec_mode = DEFAULT_DNSSEC_MODE;
 581         m->dns_over_tls_mode = DEFAULT_DNS_OVER_TLS_MODE;
 582         m->enable_cache = true;
 583         m->dns_stub_listener_mode = DNS_STUB_LISTENER_UDP;
 584         m->read_resolv_conf = true;
 585         m->need_builtin_fallbacks = true;
 586         m->etc_hosts_last = m->etc_hosts_mtime = USEC_INFINITY;
 587
 588         r = dns_trust_anchor_load(&m->trust_anchor);
 589         if (r < 0)
 590                 return r;
 591
 592         r = manager_parse_config_file(m);
 593         if (r < 0)
 594                 log_warning_errno(r, "Failed to parse configuration file: %m");
 595
 596         r = sd_event_default(&m->event);
 597         if (r < 0)
 598                 return r;
 599
 600         sd_event_add_signal(m->event, NULL, SIGTERM, NULL,  NULL);
 601         sd_event_add_signal(m->event, NULL, SIGINT, NULL, NULL);
 602
 603         sd_event_set_watchdog(m->event, true);
 604
 605         r = manager_watch_hostname(m);
 606         if (r < 0)
 607                 return r;
 608
 609         r = dnssd_load(m);
 610         if (r < 0)
 611                 log_warning_errno(r, "Failed to load DNS-SD configuration files: %m");
 612
 613         r = dns_scope_new(m, &m->unicast_scope, NULL, DNS_PROTOCOL_DNS, AF_UNSPEC);
 614         if (r < 0)
 615                 return r;
 616
 617         r = manager_network_monitor_listen(m);
 618         if (r < 0)
 619                 return r;
 620
 621         r = manager_rtnl_listen(m);
 622         if (r < 0)
 623                 return r;
 624
 625         r = manager_connect_bus(m);
 626         if (r < 0)
 627                 return r;
 628
 629         (void) sd_event_add_signal(m->event, &m->sigusr1_event_source, SIGUSR1, manager_sigusr1, m);
 630         (void) sd_event_add_signal(m->event, &m->sigusr2_event_source, SIGUSR2, manager_sigusr2, m);
 631         (void) sd_event_add_signal(m->event, &m->sigrtmin1_event_source, SIGRTMIN+1, manager_sigrtmin1, m);
 632
 633         manager_cleanup_saved_user(m);
 634
 635         *ret = TAKE_PTR(m);
 636
 637         return 0;
 638 }
 639
 640 int manager_start(Manager *m) {
 641         int r;
 642
 643         assert(m);
 644
 645         r = manager_dns_stub_start(m);
 646         if (r < 0)
 647                 return r;
 648
 649         return 0;
 650 }
 651
 652 Manager *manager_free(Manager *m) {
 653         Link *l;
 654         DnssdService *s;
 655
 656         if (!m)
 657                 return NULL;
 658
 659         dns_server_unlink_all(m->dns_servers);
 660         dns_server_unlink_all(m->fallback_dns_servers);
 661         dns_search_domain_unlink_all(m->search_domains);
 662
 663         while ((l = hashmap_first(m->links)))
 664                link_free(l);
 665
 666         while (m->dns_queries)
 667                 dns_query_free(m->dns_queries);
 668
 669         dns_scope_free(m->unicast_scope);
 670
 671         /* At this point only orphaned streams should remain. All others should have been freed already by their
 672          * owners */
 673         while (m->dns_streams)
 674                 dns_stream_unref(m->dns_streams);
 675
 676         hashmap_free(m->links);
 677         hashmap_free(m->dns_transactions);
 678
 679         sd_event_source_unref(m->network_event_source);
 680         sd_network_monitor_unref(m->network_monitor);
 681
 682         sd_netlink_unref(m->rtnl);
 683         sd_event_source_unref(m->rtnl_event_source);
 684
 685         manager_llmnr_stop(m);
 686         manager_mdns_stop(m);
 687         manager_dns_stub_stop(m);
 688
 689         sd_bus_slot_unref(m->prepare_for_sleep_slot);
 690         sd_bus_unref(m->bus);
 691
 692         sd_event_source_unref(m->sigusr1_event_source);
 693         sd_event_source_unref(m->sigusr2_event_source);
 694         sd_event_source_unref(m->sigrtmin1_event_source);
 695
 696         sd_event_unref(m->event);
 697
 698         dns_resource_key_unref(m->llmnr_host_ipv4_key);
 699         dns_resource_key_unref(m->llmnr_host_ipv6_key);
 700         dns_resource_key_unref(m->mdns_host_ipv4_key);
 701         dns_resource_key_unref(m->mdns_host_ipv6_key);
 702
 703         sd_event_source_unref(m->hostname_event_source);
 704         safe_close(m->hostname_fd);
 705
 706         free(m->full_hostname);
 707         free(m->llmnr_hostname);
 708         free(m->mdns_hostname);
 709
 710         while ((s = hashmap_first(m->dnssd_services)))
 711                dnssd_service_free(s);
 712         hashmap_free(m->dnssd_services);
 713
 714         dns_trust_anchor_flush(&m->trust_anchor);
 715         manager_etc_hosts_flush(m);
 716
 717         return mfree(m);
 718 }
 719
 720 int manager_recv(Manager *m, int fd, DnsProtocol protocol, DnsPacket **ret) {
 721         _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL;
 722         union {
 723                 struct cmsghdr header; /* For alignment */
 724                 uint8_t buffer[CMSG_SPACE(MAXSIZE(struct in_pktinfo, struct in6_pktinfo))
 725                                + CMSG_SPACE(int) /* ttl/hoplimit */
 726                                + EXTRA_CMSG_SPACE /* kernel appears to require extra buffer space */];
 727         } control;
 728         union sockaddr_union sa;
 729         struct msghdr mh = {};
 730         struct cmsghdr *cmsg;
 731         struct iovec iov;
 732         ssize_t ms, l;
 733         int r;
 734
 735         assert(m);
 736         assert(fd >= 0);
 737         assert(ret);
 738
 739         ms = next_datagram_size_fd(fd);
 740         if (ms < 0)
 741                 return ms;
 742
 743         r = dns_packet_new(&p, protocol, ms, DNS_PACKET_SIZE_MAX);
 744         if (r < 0)
 745                 return r;
 746
 747         iov.iov_base = DNS_PACKET_DATA(p);
 748         iov.iov_len = p->allocated;
 749
 750         mh.msg_name = &sa.sa;
 751         mh.msg_namelen = sizeof(sa);
 752         mh.msg_iov = &iov;
 753         mh.msg_iovlen = 1;
 754         mh.msg_control = &control;
 755         mh.msg_controllen = sizeof(control);
 756
 757         l = recvmsg(fd, &mh, 0);
 758         if (l == 0)
 759                 return 0;
 760         if (l < 0) {
 761                 if (IN_SET(errno, EAGAIN, EINTR))
 762                         return 0;
 763
 764                 return -errno;
 765         }
 766
 767         assert(!(mh.msg_flags & MSG_CTRUNC));
 768         assert(!(mh.msg_flags & MSG_TRUNC));
 769
 770         p->size = (size_t) l;
 771
 772         p->family = sa.sa.sa_family;
 773         p->ipproto = IPPROTO_UDP;
 774         if (p->family == AF_INET) {
 775                 p->sender.in = sa.in.sin_addr;
 776                 p->sender_port = be16toh(sa.in.sin_port);
 777         } else if (p->family == AF_INET6) {
 778                 p->sender.in6 = sa.in6.sin6_addr;
 779                 p->sender_port = be16toh(sa.in6.sin6_port);
 780                 p->ifindex = sa.in6.sin6_scope_id;
 781         } else
 782                 return -EAFNOSUPPORT;
 783
 784         CMSG_FOREACH(cmsg, &mh) {
 785
 786                 if (cmsg->cmsg_level == IPPROTO_IPV6) {
 787                         assert(p->family == AF_INET6);
 788
 789                         switch (cmsg->cmsg_type) {
 790
 791                         case IPV6_PKTINFO: {
 792                                 struct in6_pktinfo *i = (struct in6_pktinfo*) CMSG_DATA(cmsg);
 793
 794                                 if (p->ifindex <= 0)
 795                                         p->ifindex = i->ipi6_ifindex;
 796
 797                                 p->destination.in6 = i->ipi6_addr;
 798                                 break;
 799                         }
 800
 801                         case IPV6_HOPLIMIT:
 802                                 p->ttl = *(int *) CMSG_DATA(cmsg);
 803                                 break;
 804
 805                         }
 806                 } else if (cmsg->cmsg_level == IPPROTO_IP) {
 807                         assert(p->family == AF_INET);
 808
 809                         switch (cmsg->cmsg_type) {
 810
 811                         case IP_PKTINFO: {
 812                                 struct in_pktinfo *i = (struct in_pktinfo*) CMSG_DATA(cmsg);
 813
 814                                 if (p->ifindex <= 0)
 815                                         p->ifindex = i->ipi_ifindex;
 816
 817                                 p->destination.in = i->ipi_addr;
 818                                 break;
 819                         }
 820
 821                         case IP_TTL:
 822                                 p->ttl = *(int *) CMSG_DATA(cmsg);
 823                                 break;
 824                         }
 825                 }
 826         }
 827
 828         /* The Linux kernel sets the interface index to the loopback
 829          * device if the packet came from the local host since it
 830          * avoids the routing table in such a case. Let's unset the
 831          * interface index in such a case. */
 832         if (p->ifindex == LOOPBACK_IFINDEX)
 833                 p->ifindex = 0;
 834
 835         if (protocol != DNS_PROTOCOL_DNS) {
 836                 /* If we don't know the interface index still, we look for the
 837                  * first local interface with a matching address. Yuck! */
 838                 if (p->ifindex <= 0)
 839                         p->ifindex = manager_find_ifindex(m, p->family, &p->destination);
 840         }
 841
 842         *ret = TAKE_PTR(p);
 843
 844         return 1;
 845 }
 846
 847 static int sendmsg_loop(int fd, struct msghdr *mh, int flags) {
 848         int r;
 849
 850         assert(fd >= 0);
 851         assert(mh);
 852
 853         for (;;) {
 854                 if (sendmsg(fd, mh, flags) >= 0)
 855                         return 0;
 856
 857                 if (errno == EINTR)
 858                         continue;
 859
 860                 if (errno != EAGAIN)
 861                         return -errno;
 862
 863                 r = fd_wait_for_event(fd, POLLOUT, SEND_TIMEOUT_USEC);
 864                 if (r < 0)
 865                         return r;
 866                 if (r == 0)
 867                         return -ETIMEDOUT;
 868         }
 869 }
 870
 871 static int write_loop(int fd, void *message, size_t length) {
 872         int r;
 873
 874         assert(fd >= 0);
 875         assert(message);
 876
 877         for (;;) {
 878                 if (write(fd, message, length) >= 0)
 879                         return 0;
 880
 881                 if (errno == EINTR)
 882                         continue;
 883
 884                 if (errno != EAGAIN)
 885                         return -errno;
 886
 887                 r = fd_wait_for_event(fd, POLLOUT, SEND_TIMEOUT_USEC);
 888                 if (r < 0)
 889                         return r;
 890                 if (r == 0)
 891                         return -ETIMEDOUT;
 892         }
 893 }
 894
 895 int manager_write(Manager *m, int fd, DnsPacket *p) {
 896         int r;
 897
 898         log_debug("Sending %s packet with id %" PRIu16 ".", DNS_PACKET_QR(p) ? "response" : "query", DNS_PACKET_ID(p));
 899
 900         r = write_loop(fd, DNS_PACKET_DATA(p), p->size);
 901         if (r < 0)
 902                 return r;
 903
 904         return 0;
 905 }
 906
 907 static int manager_ipv4_send(
 908                 Manager *m,
 909                 int fd,
 910                 int ifindex,
 911                 const struct in_addr *destination,
 912                 uint16_t port,
 913                 const struct in_addr *source,
 914                 DnsPacket *p) {
 915         union sockaddr_union sa = {
 916                 .in.sin_family = AF_INET,
 917         };
 918         union {
 919                 struct cmsghdr header; /* For alignment */
 920                 uint8_t buffer[CMSG_SPACE(sizeof(struct in_pktinfo))];
 921         } control;
 922         struct msghdr mh = {};
 923         struct iovec iov;
 924
 925         assert(m);
 926         assert(fd >= 0);
 927         assert(destination);
 928         assert(port > 0);
 929         assert(p);
 930
 931         iov.iov_base = DNS_PACKET_DATA(p);
 932         iov.iov_len = p->size;
 933
 934         sa.in.sin_addr = *destination;
 935         sa.in.sin_port = htobe16(port),
 936
 937         mh.msg_iov = &iov;
 938         mh.msg_iovlen = 1;
 939         mh.msg_name = &sa.sa;
 940         mh.msg_namelen = sizeof(sa.in);
 941
 942         if (ifindex > 0) {
 943                 struct cmsghdr *cmsg;
 944                 struct in_pktinfo *pi;
 945
 946                 zero(control);
 947
 948                 mh.msg_control = &control;
 949                 mh.msg_controllen = CMSG_LEN(sizeof(struct in_pktinfo));
 950
 951                 cmsg = CMSG_FIRSTHDR(&mh);
 952                 cmsg->cmsg_len = mh.msg_controllen;
 953                 cmsg->cmsg_level = IPPROTO_IP;
 954                 cmsg->cmsg_type = IP_PKTINFO;
 955
 956                 pi = (struct in_pktinfo*) CMSG_DATA(cmsg);
 957                 pi->ipi_ifindex = ifindex;
 958
 959                 if (source)
 960                         pi->ipi_spec_dst = *source;
 961         }
 962
 963         return sendmsg_loop(fd, &mh, 0);
 964 }
 965
 966 static int manager_ipv6_send(
 967                 Manager *m,
 968                 int fd,
 969                 int ifindex,
 970                 const struct in6_addr *destination,
 971                 uint16_t port,
 972                 const struct in6_addr *source,
 973                 DnsPacket *p) {
 974
 975         union sockaddr_union sa = {
 976                 .in6.sin6_family = AF_INET6,
 977         };
 978         union {
 979                 struct cmsghdr header; /* For alignment */
 980                 uint8_t buffer[CMSG_SPACE(sizeof(struct in6_pktinfo))];
 981         } control;
 982         struct msghdr mh = {};
 983         struct iovec iov;
 984
 985         assert(m);
 986         assert(fd >= 0);
 987         assert(destination);
 988         assert(port > 0);
 989         assert(p);
 990
 991         iov.iov_base = DNS_PACKET_DATA(p);
 992         iov.iov_len = p->size;
 993
 994         sa.in6.sin6_addr = *destination;
 995         sa.in6.sin6_port = htobe16(port),
 996         sa.in6.sin6_scope_id = ifindex;
 997
 998         mh.msg_iov = &iov;
 999         mh.msg_iovlen = 1;
1000         mh.msg_name = &sa.sa;
1001         mh.msg_namelen = sizeof(sa.in6);
1002
1003         if (ifindex > 0) {
1004                 struct cmsghdr *cmsg;
1005                 struct in6_pktinfo *pi;
1006
1007                 zero(control);
1008
1009                 mh.msg_control = &control;
1010                 mh.msg_controllen = CMSG_LEN(sizeof(struct in6_pktinfo));
1011
1012                 cmsg = CMSG_FIRSTHDR(&mh);
1013                 cmsg->cmsg_len = mh.msg_controllen;
1014                 cmsg->cmsg_level = IPPROTO_IPV6;
1015                 cmsg->cmsg_type = IPV6_PKTINFO;
1016
1017                 pi = (struct in6_pktinfo*) CMSG_DATA(cmsg);
1018                 pi->ipi6_ifindex = ifindex;
1019
1020                 if (source)
1021                         pi->ipi6_addr = *source;
1022         }
1023
1024         return sendmsg_loop(fd, &mh, 0);
1025 }
1026
1027 int manager_send(
1028                 Manager *m,
1029                 int fd,
1030                 int ifindex,
1031                 int family,
1032                 const union in_addr_union *destination,
1033                 uint16_t port,
1034                 const union in_addr_union *source,
1035                 DnsPacket *p) {
1036
1037         assert(m);
1038         assert(fd >= 0);
1039         assert(destination);
1040         assert(port > 0);
1041         assert(p);
1042
1043         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));
1044
1045         if (family == AF_INET)
1046                 return manager_ipv4_send(m, fd, ifindex, &destination->in, port, &source->in, p);
1047         if (family == AF_INET6)
1048                 return manager_ipv6_send(m, fd, ifindex, &destination->in6, port, &source->in6, p);
1049
1050         return -EAFNOSUPPORT;
1051 }
1052
1053 uint32_t manager_find_mtu(Manager *m) {
1054         uint32_t mtu = 0;
1055         Link *l;
1056         Iterator i;
1057
1058         /* If we don't know on which link a DNS packet would be
1059          * delivered, let's find the largest MTU that works on all
1060          * interfaces we know of */
1061
1062         HASHMAP_FOREACH(l, m->links, i) {
1063                 if (l->mtu <= 0)
1064                         continue;
1065
1066                 if (mtu <= 0 || l->mtu < mtu)
1067                         mtu = l->mtu;
1068         }
1069
1070         return mtu;
1071 }
1072
1073 int manager_find_ifindex(Manager *m, int family, const union in_addr_union *in_addr) {
1074         LinkAddress *a;
1075
1076         assert(m);
1077
1078         a = manager_find_link_address(m, family, in_addr);
1079         if (a)
1080                 return a->link->ifindex;
1081
1082         return 0;
1083 }
1084
1085 void manager_refresh_rrs(Manager *m) {
1086         Iterator i;
1087         Link *l;
1088         DnssdService *s;
1089
1090         assert(m);
1091
1092         m->llmnr_host_ipv4_key = dns_resource_key_unref(m->llmnr_host_ipv4_key);
1093         m->llmnr_host_ipv6_key = dns_resource_key_unref(m->llmnr_host_ipv6_key);
1094         m->mdns_host_ipv4_key = dns_resource_key_unref(m->mdns_host_ipv4_key);
1095         m->mdns_host_ipv6_key = dns_resource_key_unref(m->mdns_host_ipv6_key);
1096
1097         if (m->mdns_support == RESOLVE_SUPPORT_YES)
1098                 HASHMAP_FOREACH(s, m->dnssd_services, i)
1099                         if (dnssd_update_rrs(s) < 0)
1100                                 log_warning("Failed to refresh DNS-SD service '%s'", s->name);
1101
1102         HASHMAP_FOREACH(l, m->links, i) {
1103                 link_add_rrs(l, true);
1104                 link_add_rrs(l, false);
1105         }
1106 }
1107
1108 static int manager_next_random_name(const char *old, char **ret_new) {
1109         const char *p;
1110         uint64_t u, a;
1111         char *n;
1112
1113         p = strchr(old, 0);
1114         assert(p);
1115
1116         while (p > old) {
1117                 if (!strchr(DIGITS, p[-1]))
1118                         break;
1119
1120                 p--;
1121         }
1122
1123         if (*p == 0 || safe_atou64(p, &u) < 0 || u <= 0)
1124                 u = 1;
1125
1126         /* Add a random number to the old value. This way we can avoid
1127          * that two hosts pick the same hostname, win on IPv4 and lose
1128          * on IPv6 (or vice versa), and pick the same hostname
1129          * replacement hostname, ad infinitum. We still want the
1130          * numbers to go up monotonically, hence we just add a random
1131          * value 1..10 */
1132
1133         random_bytes(&a, sizeof(a));
1134         u += 1 + a % 10;
1135
1136         if (asprintf(&n, "%.*s%" PRIu64, (int) (p - old), old, u) < 0)
1137                 return -ENOMEM;
1138
1139         *ret_new = n;
1140
1141         return 0;
1142 }
1143
1144 int manager_next_hostname(Manager *m) {
1145         _cleanup_free_ char *h = NULL, *k = NULL;
1146         int r;
1147
1148         assert(m);
1149
1150         r = manager_next_random_name(m->llmnr_hostname, &h);
1151         if (r < 0)
1152                 return r;
1153
1154         r = dns_name_concat(h, "local", &k);
1155         if (r < 0)
1156                 return r;
1157
1158         log_info("Hostname conflict, changing published hostname from '%s' to '%s'.", m->llmnr_hostname, h);
1159
1160         free_and_replace(m->llmnr_hostname, h);
1161         free_and_replace(m->mdns_hostname, k);
1162
1163         manager_refresh_rrs(m);
1164
1165         return 0;
1166 }
1167
1168 LinkAddress* manager_find_link_address(Manager *m, int family, const union in_addr_union *in_addr) {
1169         Iterator i;
1170         Link *l;
1171
1172         assert(m);
1173
1174         HASHMAP_FOREACH(l, m->links, i) {
1175                 LinkAddress *a;
1176
1177                 a = link_find_address(l, family, in_addr);
1178                 if (a)
1179                         return a;
1180         }
1181
1182         return NULL;
1183 }
1184
1185 bool manager_our_packet(Manager *m, DnsPacket *p) {
1186         assert(m);
1187         assert(p);
1188
1189         return !!manager_find_link_address(m, p->family, &p->sender);
1190 }
1191
1192 DnsScope* manager_find_scope(Manager *m, DnsPacket *p) {
1193         Link *l;
1194
1195         assert(m);
1196         assert(p);
1197
1198         l = hashmap_get(m->links, INT_TO_PTR(p->ifindex));
1199         if (!l)
1200                 return NULL;
1201
1202         switch (p->protocol) {
1203         case DNS_PROTOCOL_LLMNR:
1204                 if (p->family == AF_INET)
1205                         return l->llmnr_ipv4_scope;
1206                 else if (p->family == AF_INET6)
1207                         return l->llmnr_ipv6_scope;
1208
1209                 break;
1210
1211         case DNS_PROTOCOL_MDNS:
1212                 if (p->family == AF_INET)
1213                         return l->mdns_ipv4_scope;
1214                 else if (p->family == AF_INET6)
1215                         return l->mdns_ipv6_scope;
1216
1217                 break;
1218
1219         default:
1220                 break;
1221         }
1222
1223         return NULL;
1224 }
1225
1226 void manager_verify_all(Manager *m) {
1227         DnsScope *s;
1228
1229         assert(m);
1230
1231         LIST_FOREACH(scopes, s, m->dns_scopes)
1232                 dns_zone_verify_all(&s->zone);
1233 }
1234
1235 int manager_is_own_hostname(Manager *m, const char *name) {
1236         int r;
1237
1238         assert(m);
1239         assert(name);
1240
1241         if (m->llmnr_hostname) {
1242                 r = dns_name_equal(name, m->llmnr_hostname);
1243                 if (r != 0)
1244                         return r;
1245         }
1246
1247         if (m->mdns_hostname) {
1248                 r = dns_name_equal(name, m->mdns_hostname);
1249                 if (r != 0)
1250                         return r;
1251         }
1252
1253         if (m->full_hostname)
1254                 return dns_name_equal(name, m->full_hostname);
1255
1256         return 0;
1257 }
1258
1259 int manager_compile_dns_servers(Manager *m, OrderedSet **dns) {
1260         DnsServer *s;
1261         Iterator i;
1262         Link *l;
1263         int r;
1264
1265         assert(m);
1266         assert(dns);
1267
1268         r = ordered_set_ensure_allocated(dns, &dns_server_hash_ops);
1269         if (r < 0)
1270                 return r;
1271
1272         /* First add the system-wide servers and domains */
1273         LIST_FOREACH(servers, s, m->dns_servers) {
1274                 r = ordered_set_put(*dns, s);
1275                 if (r == -EEXIST)
1276                         continue;
1277                 if (r < 0)
1278                         return r;
1279         }
1280
1281         /* Then, add the per-link servers */
1282         HASHMAP_FOREACH(l, m->links, i) {
1283                 LIST_FOREACH(servers, s, l->dns_servers) {
1284                         r = ordered_set_put(*dns, s);
1285                         if (r == -EEXIST)
1286                                 continue;
1287                         if (r < 0)
1288                                 return r;
1289                 }
1290         }
1291
1292         /* If we found nothing, add the fallback servers */
1293         if (ordered_set_isempty(*dns)) {
1294                 LIST_FOREACH(servers, s, m->fallback_dns_servers) {
1295                         r = ordered_set_put(*dns, s);
1296                         if (r == -EEXIST)
1297                                 continue;
1298                         if (r < 0)
1299                                 return r;
1300                 }
1301         }
1302
1303         return 0;
1304 }
1305
1306 /* filter_route is a tri-state:
1307  *   < 0: no filtering
1308  *   = 0 or false: return only domains which should be used for searching
1309  *   > 0 or true: return only domains which are for routing only
1310  */
1311 int manager_compile_search_domains(Manager *m, OrderedSet **domains, int filter_route) {
1312         DnsSearchDomain *d;
1313         Iterator i;
1314         Link *l;
1315         int r;
1316
1317         assert(m);
1318         assert(domains);
1319
1320         r = ordered_set_ensure_allocated(domains, &dns_name_hash_ops);
1321         if (r < 0)
1322                 return r;
1323
1324         LIST_FOREACH(domains, d, m->search_domains) {
1325
1326                 if (filter_route >= 0 &&
1327                     d->route_only != !!filter_route)
1328                         continue;
1329
1330                 r = ordered_set_put(*domains, d->name);
1331                 if (r == -EEXIST)
1332                         continue;
1333                 if (r < 0)
1334                         return r;
1335         }
1336
1337         HASHMAP_FOREACH(l, m->links, i) {
1338
1339                 LIST_FOREACH(domains, d, l->search_domains) {
1340
1341                         if (filter_route >= 0 &&
1342                             d->route_only != !!filter_route)
1343                                 continue;
1344
1345                         r = ordered_set_put(*domains, d->name);
1346                         if (r == -EEXIST)
1347                                 continue;
1348                         if (r < 0)
1349                                 return r;
1350                 }
1351         }
1352
1353         return 0;
1354 }
1355
1356 DnssecMode manager_get_dnssec_mode(Manager *m) {
1357         assert(m);
1358
1359         if (m->dnssec_mode != _DNSSEC_MODE_INVALID)
1360                 return m->dnssec_mode;
1361
1362         return DNSSEC_NO;
1363 }
1364
1365 bool manager_dnssec_supported(Manager *m) {
1366         DnsServer *server;
1367         Iterator i;
1368         Link *l;
1369
1370         assert(m);
1371
1372         if (manager_get_dnssec_mode(m) == DNSSEC_NO)
1373                 return false;
1374
1375         server = manager_get_dns_server(m);
1376         if (server && !dns_server_dnssec_supported(server))
1377                 return false;
1378
1379         HASHMAP_FOREACH(l, m->links, i)
1380                 if (!link_dnssec_supported(l))
1381                         return false;
1382
1383         return true;
1384 }
1385
1386 DnsOverTlsMode manager_get_dns_over_tls_mode(Manager *m) {
1387         assert(m);
1388
1389         if (m->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
1390                 return m->dns_over_tls_mode;
1391
1392         return DNS_OVER_TLS_NO;
1393 }
1394
1395 void manager_dnssec_verdict(Manager *m, DnssecVerdict verdict, const DnsResourceKey *key) {
1396
1397         assert(verdict >= 0);
1398         assert(verdict < _DNSSEC_VERDICT_MAX);
1399
1400         if (DEBUG_LOGGING) {
1401                 char s[DNS_RESOURCE_KEY_STRING_MAX];
1402
1403                 log_debug("Found verdict for lookup %s: %s",
1404                           dns_resource_key_to_string(key, s, sizeof s),
1405                           dnssec_verdict_to_string(verdict));
1406         }
1407
1408         m->n_dnssec_verdict[verdict]++;
1409 }
1410
1411 bool manager_routable(Manager *m, int family) {
1412         Iterator i;
1413         Link *l;
1414
1415         assert(m);
1416
1417         /* Returns true if the host has at least one interface with a routable address of the specified type */
1418
1419         HASHMAP_FOREACH(l, m->links, i)
1420                 if (link_relevant(l, family, false))
1421                         return true;
1422
1423         return false;
1424 }
1425
1426 void manager_flush_caches(Manager *m) {
1427         DnsScope *scope;
1428
1429         assert(m);
1430
1431         LIST_FOREACH(scopes, scope, m->dns_scopes)
1432                 dns_cache_flush(&scope->cache);
1433
1434         log_info("Flushed all caches.");
1435 }
1436
1437 void manager_reset_server_features(Manager *m) {
1438         Iterator i;
1439         Link *l;
1440
1441         dns_server_reset_features_all(m->dns_servers);
1442         dns_server_reset_features_all(m->fallback_dns_servers);
1443
1444         HASHMAP_FOREACH(l, m->links, i)
1445                 dns_server_reset_features_all(l->dns_servers);
1446
1447         log_info("Resetting learnt feature levels on all servers.");
1448 }
1449
1450 void manager_cleanup_saved_user(Manager *m) {
1451         _cleanup_closedir_ DIR *d = NULL;
1452         struct dirent *de;
1453         int r;
1454
1455         assert(m);
1456
1457         /* Clean up all saved per-link files in /run/systemd/resolve/netif/ that don't have a matching interface
1458          * anymore. These files are created to persist settings pushed in by the user via the bus, so that resolved can
1459          * be restarted without losing this data. */
1460
1461         d = opendir("/run/systemd/resolve/netif/");
1462         if (!d) {
1463                 if (errno == ENOENT)
1464                         return;
1465
1466                 log_warning_errno(errno, "Failed to open interface directory: %m");
1467                 return;
1468         }
1469
1470         FOREACH_DIRENT_ALL(de, d, log_error_errno(errno, "Failed to read interface directory: %m")) {
1471                 _cleanup_free_ char *p = NULL;
1472                 int ifindex;
1473                 Link *l;
1474
1475                 if (!IN_SET(de->d_type, DT_UNKNOWN, DT_REG))
1476                         continue;
1477
1478                 if (dot_or_dot_dot(de->d_name))
1479                         continue;
1480
1481                 r = parse_ifindex(de->d_name, &ifindex);
1482                 if (r < 0) /* Probably some temporary file from a previous run. Delete it */
1483                         goto rm;
1484
1485                 l = hashmap_get(m->links, INT_TO_PTR(ifindex));
1486                 if (!l) /* link vanished */
1487                         goto rm;
1488
1489                 if (l->is_managed) /* now managed by networkd, hence the bus settings are useless */
1490                         goto rm;
1491
1492                 continue;
1493
1494         rm:
1495                 p = strappend("/run/systemd/resolve/netif/", de->d_name);
1496                 if (!p) {
1497                         log_oom();
1498                         return;
1499                 }
1500
1501                 (void) unlink(p);
1502         }
1503 }
1504
1505 bool manager_next_dnssd_names(Manager *m) {
1506         Iterator i;
1507         DnssdService *s;
1508         bool tried = false;
1509         int r;
1510
1511         assert(m);
1512
1513         HASHMAP_FOREACH(s, m->dnssd_services, i) {
1514                 _cleanup_free_ char * new_name = NULL;
1515
1516                 if (!s->withdrawn)
1517                         continue;
1518
1519                 r = manager_next_random_name(s->name_template, &new_name);
1520                 if (r < 0) {
1521                         log_warning_errno(r, "Failed to get new name for service '%s': %m", s->name);
1522                         continue;
1523                 }
1524
1525                 free_and_replace(s->name_template, new_name);
1526
1527                 s->withdrawn = false;
1528
1529                 tried = true;
1530         }
1531
1532         if (tried)
1533                 manager_refresh_rrs(m);
1534
1535         return tried;
1536 }