src/resolve/resolved-manager.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include <fcntl.h>
   4 #include <netinet/in.h>
   5 #include <poll.h>
   6 #include <sys/ioctl.h>
   7 #include <sys/stat.h>
   8 #include <sys/types.h>
   9 #include <unistd.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 "bus-polkit.h"
  18 #include "dirent-util.h"
  19 #include "dns-domain.h"
  20 #include "fd-util.h"
  21 #include "fileio.h"
  22 #include "hostname-util.h"
  23 #include "io-util.h"
  24 #include "missing_network.h"
  25 #include "netlink-util.h"
  26 #include "network-internal.h"
  27 #include "ordered-set.h"
  28 #include "parse-util.h"
  29 #include "random-util.h"
  30 #include "resolved-bus.h"
  31 #include "resolved-conf.h"
  32 #include "resolved-dns-stub.h"
  33 #include "resolved-dnssd.h"
  34 #include "resolved-etc-hosts.h"
  35 #include "resolved-llmnr.h"
  36 #include "resolved-manager.h"
  37 #include "resolved-mdns.h"
  38 #include "resolved-resolv-conf.h"
  39 #include "socket-util.h"
  40 #include "string-table.h"
  41 #include "string-util.h"
  42 #include "utf8.h"
  43
  44 #define SEND_TIMEOUT_USEC (200 * USEC_PER_MSEC)
  45
  46 static int manager_process_link(sd_netlink *rtnl, sd_netlink_message *mm, void *userdata) {
  47         Manager *m = userdata;
  48         uint16_t type;
  49         Link *l;
  50         int ifindex, r;
  51
  52         assert(rtnl);
  53         assert(m);
  54         assert(mm);
  55
  56         r = sd_netlink_message_get_type(mm, &type);
  57         if (r < 0)
  58                 goto fail;
  59
  60         r = sd_rtnl_message_link_get_ifindex(mm, &ifindex);
  61         if (r < 0)
  62                 goto fail;
  63
  64         l = hashmap_get(m->links, INT_TO_PTR(ifindex));
  65
  66         switch (type) {
  67
  68         case RTM_NEWLINK:{
  69                 bool is_new = !l;
  70
  71                 if (!l) {
  72                         r = link_new(m, &l, ifindex);
  73                         if (r < 0)
  74                                 goto fail;
  75                 }
  76
  77                 r = link_process_rtnl(l, mm);
  78                 if (r < 0)
  79                         goto fail;
  80
  81                 r = link_update(l);
  82                 if (r < 0)
  83                         goto fail;
  84
  85                 if (is_new)
  86                         log_debug("Found new link %i/%s", ifindex, l->ifname);
  87
  88                 break;
  89         }
  90
  91         case RTM_DELLINK:
  92                 if (l) {
  93                         log_debug("Removing link %i/%s", l->ifindex, l->ifname);
  94                         link_remove_user(l);
  95                         link_free(l);
  96                 }
  97
  98                 break;
  99         }
 100
 101         return 0;
 102
 103 fail:
 104         log_warning_errno(r, "Failed to process RTNL link message: %m");
 105         return 0;
 106 }
 107
 108 static int manager_process_address(sd_netlink *rtnl, sd_netlink_message *mm, void *userdata) {
 109         Manager *m = userdata;
 110         union in_addr_union address;
 111         uint16_t type;
 112         int r, ifindex, family;
 113         LinkAddress *a;
 114         Link *l;
 115
 116         assert(rtnl);
 117         assert(mm);
 118         assert(m);
 119
 120         r = sd_netlink_message_get_type(mm, &type);
 121         if (r < 0)
 122                 goto fail;
 123
 124         r = sd_rtnl_message_addr_get_ifindex(mm, &ifindex);
 125         if (r < 0)
 126                 goto fail;
 127
 128         l = hashmap_get(m->links, INT_TO_PTR(ifindex));
 129         if (!l)
 130                 return 0;
 131
 132         r = sd_rtnl_message_addr_get_family(mm, &family);
 133         if (r < 0)
 134                 goto fail;
 135
 136         switch (family) {
 137
 138         case AF_INET:
 139                 r = sd_netlink_message_read_in_addr(mm, IFA_LOCAL, &address.in);
 140                 if (r < 0) {
 141                         r = sd_netlink_message_read_in_addr(mm, IFA_ADDRESS, &address.in);
 142                         if (r < 0)
 143                                 goto fail;
 144                 }
 145
 146                 break;
 147
 148         case AF_INET6:
 149                 r = sd_netlink_message_read_in6_addr(mm, IFA_LOCAL, &address.in6);
 150                 if (r < 0) {
 151                         r = sd_netlink_message_read_in6_addr(mm, IFA_ADDRESS, &address.in6);
 152                         if (r < 0)
 153                                 goto fail;
 154                 }
 155
 156                 break;
 157
 158         default:
 159                 return 0;
 160         }
 161
 162         a = link_find_address(l, family, &address);
 163
 164         switch (type) {
 165
 166         case RTM_NEWADDR:
 167
 168                 if (!a) {
 169                         r = link_address_new(l, &a, family, &address);
 170                         if (r < 0)
 171                                 return r;
 172                 }
 173
 174                 r = link_address_update_rtnl(a, mm);
 175                 if (r < 0)
 176                         return r;
 177
 178                 break;
 179
 180         case RTM_DELADDR:
 181                 link_address_free(a);
 182                 break;
 183         }
 184
 185         return 0;
 186
 187 fail:
 188         log_warning_errno(r, "Failed to process RTNL address message: %m");
 189         return 0;
 190 }
 191
 192 static int manager_rtnl_listen(Manager *m) {
 193         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL;
 194         sd_netlink_message *i;
 195         int r;
 196
 197         assert(m);
 198
 199         /* First, subscribe to interfaces coming and going */
 200         r = sd_netlink_open(&m->rtnl);
 201         if (r < 0)
 202                 return r;
 203
 204         r = sd_netlink_attach_event(m->rtnl, m->event, SD_EVENT_PRIORITY_IMPORTANT);
 205         if (r < 0)
 206                 return r;
 207
 208         r = sd_netlink_add_match(m->rtnl, NULL, RTM_NEWLINK, manager_process_link, NULL, m, "resolve-NEWLINK");
 209         if (r < 0)
 210                 return r;
 211
 212         r = sd_netlink_add_match(m->rtnl, NULL, RTM_DELLINK, manager_process_link, NULL, m, "resolve-DELLINK");
 213         if (r < 0)
 214                 return r;
 215
 216         r = sd_netlink_add_match(m->rtnl, NULL, RTM_NEWADDR, manager_process_address, NULL, m, "resolve-NEWADDR");
 217         if (r < 0)
 218                 return r;
 219
 220         r = sd_netlink_add_match(m->rtnl, NULL, RTM_DELADDR, manager_process_address, NULL, m, "resolve-DELADDR");
 221         if (r < 0)
 222                 return r;
 223
 224         /* Then, enumerate all links */
 225         r = sd_rtnl_message_new_link(m->rtnl, &req, RTM_GETLINK, 0);
 226         if (r < 0)
 227                 return r;
 228
 229         r = sd_netlink_message_request_dump(req, true);
 230         if (r < 0)
 231                 return r;
 232
 233         r = sd_netlink_call(m->rtnl, req, 0, &reply);
 234         if (r < 0)
 235                 return r;
 236
 237         for (i = reply; i; i = sd_netlink_message_next(i)) {
 238                 r = manager_process_link(m->rtnl, i, m);
 239                 if (r < 0)
 240                         return r;
 241         }
 242
 243         req = sd_netlink_message_unref(req);
 244         reply = sd_netlink_message_unref(reply);
 245
 246         /* Finally, enumerate all addresses, too */
 247         r = sd_rtnl_message_new_addr(m->rtnl, &req, RTM_GETADDR, 0, AF_UNSPEC);
 248         if (r < 0)
 249                 return r;
 250
 251         r = sd_netlink_message_request_dump(req, true);
 252         if (r < 0)
 253                 return r;
 254
 255         r = sd_netlink_call(m->rtnl, req, 0, &reply);
 256         if (r < 0)
 257                 return r;
 258
 259         for (i = reply; i; i = sd_netlink_message_next(i)) {
 260                 r = manager_process_address(m->rtnl, i, m);
 261                 if (r < 0)
 262                         return r;
 263         }
 264
 265         return r;
 266 }
 267
 268 static int on_network_event(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
 269         Manager *m = userdata;
 270         Iterator i;
 271         Link *l;
 272         int r;
 273
 274         assert(m);
 275
 276         sd_network_monitor_flush(m->network_monitor);
 277
 278         HASHMAP_FOREACH(l, m->links, i) {
 279                 r = link_update(l);
 280                 if (r < 0)
 281                         log_warning_errno(r, "Failed to update monitor information for %i: %m", l->ifindex);
 282         }
 283
 284         (void) manager_write_resolv_conf(m);
 285         (void) manager_send_changed(m, "DNS");
 286
 287         return 0;
 288 }
 289
 290 static int manager_network_monitor_listen(Manager *m) {
 291         int r, fd, events;
 292
 293         assert(m);
 294
 295         r = sd_network_monitor_new(&m->network_monitor, NULL);
 296         if (r < 0)
 297                 return r;
 298
 299         fd = sd_network_monitor_get_fd(m->network_monitor);
 300         if (fd < 0)
 301                 return fd;
 302
 303         events = sd_network_monitor_get_events(m->network_monitor);
 304         if (events < 0)
 305                 return events;
 306
 307         r = sd_event_add_io(m->event, &m->network_event_source, fd, events, &on_network_event, m);
 308         if (r < 0)
 309                 return r;
 310
 311         r = sd_event_source_set_priority(m->network_event_source, SD_EVENT_PRIORITY_IMPORTANT+5);
 312         if (r < 0)
 313                 return r;
 314
 315         (void) sd_event_source_set_description(m->network_event_source, "network-monitor");
 316
 317         return 0;
 318 }
 319
 320 static int determine_hostname(char **full_hostname, char **llmnr_hostname, char **mdns_hostname) {
 321         _cleanup_free_ char *h = NULL, *n = NULL;
 322 #if HAVE_LIBIDN2
 323         _cleanup_free_ char *utf8 = NULL;
 324 #elif HAVE_LIBIDN
 325         int k;
 326 #endif
 327         char label[DNS_LABEL_MAX];
 328         const char *p, *decoded;
 329         int r;
 330
 331         assert(full_hostname);
 332         assert(llmnr_hostname);
 333         assert(mdns_hostname);
 334
 335         /* Extract and normalize the first label of the locally configured hostname, and check it's not "localhost". */
 336
 337         r = gethostname_strict(&h);
 338         if (r < 0)
 339                 return log_debug_errno(r, "Can't determine system hostname: %m");
 340
 341         p = h;
 342         r = dns_label_unescape(&p, label, sizeof label, 0);
 343         if (r < 0)
 344                 return log_error_errno(r, "Failed to unescape host name: %m");
 345         if (r == 0)
 346                 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
 347                                        "Couldn't find a single label in hostname.");
 348
 349 #if HAVE_LIBIDN2
 350         r = idn2_to_unicode_8z8z(label, &utf8, 0);
 351         if (r != IDN2_OK)
 352                 return log_error("Failed to undo IDNA: %s", idn2_strerror(r));
 353         assert(utf8_is_valid(utf8));
 354
 355         r = strlen(utf8);
 356         decoded = utf8;
 357 #elif HAVE_LIBIDN
 358         k = dns_label_undo_idna(label, r, label, sizeof label);
 359         if (k < 0)
 360                 return log_error_errno(k, "Failed to undo IDNA: %m");
 361         if (k > 0)
 362                 r = k;
 363
 364         if (!utf8_is_valid(label))
 365                 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
 366                                        "System hostname is not UTF-8 clean.");
 367         decoded = label;
 368 #else
 369         decoded = label; /* no decoding */
 370 #endif
 371
 372         r = dns_label_escape_new(decoded, r, &n);
 373         if (r < 0)
 374                 return log_error_errno(r, "Failed to escape host name: %m");
 375
 376         if (is_localhost(n))
 377                 return log_debug_errno(SYNTHETIC_ERRNO(EINVAL),
 378                                        "System hostname is 'localhost', ignoring.");
 379
 380         r = dns_name_concat(n, "local", 0, 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, 0);
 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", 0, &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         bool llmnr_hostname_changed;
 442         int r;
 443
 444         assert(m);
 445
 446         r = determine_hostname(&full_hostname, &llmnr_hostname, &mdns_hostname);
 447         if (r < 0)
 448                 return 0; /* ignore invalid hostnames */
 449
 450         llmnr_hostname_changed = !streq(llmnr_hostname, m->llmnr_hostname);
 451         if (streq(full_hostname, m->full_hostname) &&
 452             !llmnr_hostname_changed &&
 453             streq(mdns_hostname, m->mdns_hostname))
 454                 return 0;
 455
 456         log_info("System hostname changed to '%s'.", full_hostname);
 457
 458         free_and_replace(m->full_hostname, full_hostname);
 459         free_and_replace(m->llmnr_hostname, llmnr_hostname);
 460         free_and_replace(m->mdns_hostname, mdns_hostname);
 461
 462         manager_refresh_rrs(m);
 463         (void) manager_send_changed(m, "LLMNRHostname");
 464
 465         return 0;
 466 }
 467
 468 static int manager_watch_hostname(Manager *m) {
 469         int r;
 470
 471         assert(m);
 472
 473         m->hostname_fd = open("/proc/sys/kernel/hostname",
 474                               O_RDONLY|O_CLOEXEC|O_NONBLOCK|O_NOCTTY);
 475         if (m->hostname_fd < 0) {
 476                 log_warning_errno(errno, "Failed to watch hostname: %m");
 477                 return 0;
 478         }
 479
 480         r = sd_event_add_io(m->event, &m->hostname_event_source, m->hostname_fd, 0, on_hostname_change, m);
 481         if (r < 0) {
 482                 if (r == -EPERM)
 483                         /* kernels prior to 3.2 don't support polling this file. Ignore the failure. */
 484                         m->hostname_fd = safe_close(m->hostname_fd);
 485                 else
 486                         return log_error_errno(r, "Failed to add hostname event source: %m");
 487         }
 488
 489         (void) sd_event_source_set_description(m->hostname_event_source, "hostname");
 490
 491         r = determine_hostname(&m->full_hostname, &m->llmnr_hostname, &m->mdns_hostname);
 492         if (r < 0) {
 493                 log_info("Defaulting to hostname '%s'.", fallback_hostname());
 494
 495                 r = make_fallback_hostnames(&m->full_hostname, &m->llmnr_hostname, &m->mdns_hostname);
 496                 if (r < 0)
 497                         return r;
 498         } else
 499                 log_info("Using system hostname '%s'.", m->full_hostname);
 500
 501         return 0;
 502 }
 503
 504 static int manager_sigusr1(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
 505         _cleanup_free_ char *buffer = NULL;
 506         _cleanup_fclose_ FILE *f = NULL;
 507         Manager *m = userdata;
 508         DnsServer *server;
 509         size_t size = 0;
 510         DnsScope *scope;
 511         Iterator i;
 512         Link *l;
 513
 514         assert(s);
 515         assert(si);
 516         assert(m);
 517
 518         f = open_memstream_unlocked(&buffer, &size);
 519         if (!f)
 520                 return log_oom();
 521
 522         LIST_FOREACH(scopes, scope, m->dns_scopes)
 523                 dns_scope_dump(scope, f);
 524
 525         LIST_FOREACH(servers, server, m->dns_servers)
 526                 dns_server_dump(server, f);
 527         LIST_FOREACH(servers, server, m->fallback_dns_servers)
 528                 dns_server_dump(server, f);
 529         HASHMAP_FOREACH(l, m->links, i)
 530                 LIST_FOREACH(servers, server, l->dns_servers)
 531                         dns_server_dump(server, f);
 532
 533         if (fflush_and_check(f) < 0)
 534                 return log_oom();
 535
 536         log_dump(LOG_INFO, buffer);
 537         return 0;
 538 }
 539
 540 static int manager_sigusr2(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
 541         Manager *m = userdata;
 542
 543         assert(s);
 544         assert(si);
 545         assert(m);
 546
 547         manager_flush_caches(m);
 548
 549         return 0;
 550 }
 551
 552 static int manager_sigrtmin1(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
 553         Manager *m = userdata;
 554
 555         assert(s);
 556         assert(si);
 557         assert(m);
 558
 559         manager_reset_server_features(m);
 560         return 0;
 561 }
 562
 563 int manager_new(Manager **ret) {
 564         _cleanup_(manager_freep) Manager *m = NULL;
 565         int r;
 566
 567         assert(ret);
 568
 569         m = new(Manager, 1);
 570         if (!m)
 571                 return -ENOMEM;
 572
 573         *m = (Manager) {
 574                 .llmnr_ipv4_udp_fd = -1,
 575                 .llmnr_ipv6_udp_fd = -1,
 576                 .llmnr_ipv4_tcp_fd = -1,
 577                 .llmnr_ipv6_tcp_fd = -1,
 578                 .mdns_ipv4_fd = -1,
 579                 .mdns_ipv6_fd = -1,
 580                 .dns_stub_udp_fd = -1,
 581                 .dns_stub_tcp_fd = -1,
 582                 .hostname_fd = -1,
 583
 584                 .llmnr_support = RESOLVE_SUPPORT_YES,
 585                 .mdns_support = RESOLVE_SUPPORT_YES,
 586                 .dnssec_mode = DEFAULT_DNSSEC_MODE,
 587                 .dns_over_tls_mode = DEFAULT_DNS_OVER_TLS_MODE,
 588                 .enable_cache = DNS_CACHE_MODE_YES,
 589                 .dns_stub_listener_mode = DNS_STUB_LISTENER_YES,
 590                 .read_resolv_conf = true,
 591                 .need_builtin_fallbacks = true,
 592                 .etc_hosts_last = USEC_INFINITY,
 593                 .etc_hosts_mtime = USEC_INFINITY,
 594                 .read_etc_hosts = true,
 595         };
 596
 597         r = dns_trust_anchor_load(&m->trust_anchor);
 598         if (r < 0)
 599                 return r;
 600
 601         r = manager_parse_config_file(m);
 602         if (r < 0)
 603                 log_warning_errno(r, "Failed to parse configuration file: %m");
 604
 605 #if ENABLE_DNS_OVER_TLS
 606         r = dnstls_manager_init(m);
 607         if (r < 0)
 608                 return r;
 609 #endif
 610
 611         r = sd_event_default(&m->event);
 612         if (r < 0)
 613                 return r;
 614
 615         (void) sd_event_add_signal(m->event, NULL, SIGTERM, NULL,  NULL);
 616         (void) sd_event_add_signal(m->event, NULL, SIGINT, NULL, NULL);
 617
 618         (void) sd_event_set_watchdog(m->event, true);
 619
 620         r = manager_watch_hostname(m);
 621         if (r < 0)
 622                 return r;
 623
 624         r = dnssd_load(m);
 625         if (r < 0)
 626                 log_warning_errno(r, "Failed to load DNS-SD configuration files: %m");
 627
 628         r = dns_scope_new(m, &m->unicast_scope, NULL, DNS_PROTOCOL_DNS, AF_UNSPEC);
 629         if (r < 0)
 630                 return r;
 631
 632         r = manager_network_monitor_listen(m);
 633         if (r < 0)
 634                 return r;
 635
 636         r = manager_rtnl_listen(m);
 637         if (r < 0)
 638                 return r;
 639
 640         r = manager_connect_bus(m);
 641         if (r < 0)
 642                 return r;
 643
 644         (void) sd_event_add_signal(m->event, &m->sigusr1_event_source, SIGUSR1, manager_sigusr1, m);
 645         (void) sd_event_add_signal(m->event, &m->sigusr2_event_source, SIGUSR2, manager_sigusr2, m);
 646         (void) sd_event_add_signal(m->event, &m->sigrtmin1_event_source, SIGRTMIN+1, manager_sigrtmin1, m);
 647
 648         manager_cleanup_saved_user(m);
 649
 650         *ret = TAKE_PTR(m);
 651
 652         return 0;
 653 }
 654
 655 int manager_start(Manager *m) {
 656         int r;
 657
 658         assert(m);
 659
 660         r = manager_dns_stub_start(m);
 661         if (r < 0)
 662                 return r;
 663
 664         return 0;
 665 }
 666
 667 Manager *manager_free(Manager *m) {
 668         Link *l;
 669         DnssdService *s;
 670
 671         if (!m)
 672                 return NULL;
 673
 674         dns_server_unlink_all(m->dns_servers);
 675         dns_server_unlink_all(m->fallback_dns_servers);
 676         dns_search_domain_unlink_all(m->search_domains);
 677
 678         while ((l = hashmap_first(m->links)))
 679                link_free(l);
 680
 681         while (m->dns_queries)
 682                 dns_query_free(m->dns_queries);
 683
 684         dns_scope_free(m->unicast_scope);
 685
 686         /* At this point only orphaned streams should remain. All others should have been freed already by their
 687          * owners */
 688         while (m->dns_streams)
 689                 dns_stream_unref(m->dns_streams);
 690
 691 #if ENABLE_DNS_OVER_TLS
 692         dnstls_manager_free(m);
 693 #endif
 694
 695         hashmap_free(m->links);
 696         hashmap_free(m->dns_transactions);
 697
 698         sd_event_source_unref(m->network_event_source);
 699         sd_network_monitor_unref(m->network_monitor);
 700
 701         sd_netlink_unref(m->rtnl);
 702         sd_event_source_unref(m->rtnl_event_source);
 703
 704         manager_llmnr_stop(m);
 705         manager_mdns_stop(m);
 706         manager_dns_stub_stop(m);
 707
 708         bus_verify_polkit_async_registry_free(m->polkit_registry);
 709
 710         sd_bus_flush_close_unref(m->bus);
 711
 712         sd_event_source_unref(m->sigusr1_event_source);
 713         sd_event_source_unref(m->sigusr2_event_source);
 714         sd_event_source_unref(m->sigrtmin1_event_source);
 715
 716         sd_event_unref(m->event);
 717
 718         dns_resource_key_unref(m->llmnr_host_ipv4_key);
 719         dns_resource_key_unref(m->llmnr_host_ipv6_key);
 720         dns_resource_key_unref(m->mdns_host_ipv4_key);
 721         dns_resource_key_unref(m->mdns_host_ipv6_key);
 722
 723         sd_event_source_unref(m->hostname_event_source);
 724         safe_close(m->hostname_fd);
 725
 726         free(m->full_hostname);
 727         free(m->llmnr_hostname);
 728         free(m->mdns_hostname);
 729
 730         while ((s = hashmap_first(m->dnssd_services)))
 731                dnssd_service_free(s);
 732         hashmap_free(m->dnssd_services);
 733
 734         dns_trust_anchor_flush(&m->trust_anchor);
 735         manager_etc_hosts_flush(m);
 736
 737         return mfree(m);
 738 }
 739
 740 int manager_recv(Manager *m, int fd, DnsProtocol protocol, DnsPacket **ret) {
 741         _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL;
 742         union {
 743                 struct cmsghdr header; /* For alignment */
 744                 uint8_t buffer[CMSG_SPACE(MAXSIZE(struct in_pktinfo, struct in6_pktinfo))
 745                                + CMSG_SPACE(int) /* ttl/hoplimit */
 746                                + EXTRA_CMSG_SPACE /* kernel appears to require extra buffer space */];
 747         } control;
 748         union sockaddr_union sa;
 749         struct iovec iov;
 750         struct msghdr mh = {
 751                 .msg_name = &sa.sa,
 752                 .msg_namelen = sizeof(sa),
 753                 .msg_iov = &iov,
 754                 .msg_iovlen = 1,
 755                 .msg_control = &control,
 756                 .msg_controllen = sizeof(control),
 757         };
 758         struct cmsghdr *cmsg;
 759         ssize_t ms, l;
 760         int r;
 761
 762         assert(m);
 763         assert(fd >= 0);
 764         assert(ret);
 765
 766         ms = next_datagram_size_fd(fd);
 767         if (ms < 0)
 768                 return ms;
 769
 770         r = dns_packet_new(&p, protocol, ms, DNS_PACKET_SIZE_MAX);
 771         if (r < 0)
 772                 return r;
 773
 774         iov = IOVEC_MAKE(DNS_PACKET_DATA(p), p->allocated);
 775
 776         l = recvmsg(fd, &mh, 0);
 777         if (l < 0) {
 778                 if (IN_SET(errno, EAGAIN, EINTR))
 779                         return 0;
 780
 781                 return -errno;
 782         }
 783         if (l == 0)
 784                 return 0;
 785
 786         assert(!(mh.msg_flags & MSG_CTRUNC));
 787         assert(!(mh.msg_flags & MSG_TRUNC));
 788
 789         p->size = (size_t) l;
 790
 791         p->family = sa.sa.sa_family;
 792         p->ipproto = IPPROTO_UDP;
 793         if (p->family == AF_INET) {
 794                 p->sender.in = sa.in.sin_addr;
 795                 p->sender_port = be16toh(sa.in.sin_port);
 796         } else if (p->family == AF_INET6) {
 797                 p->sender.in6 = sa.in6.sin6_addr;
 798                 p->sender_port = be16toh(sa.in6.sin6_port);
 799                 p->ifindex = sa.in6.sin6_scope_id;
 800         } else
 801                 return -EAFNOSUPPORT;
 802
 803         CMSG_FOREACH(cmsg, &mh) {
 804
 805                 if (cmsg->cmsg_level == IPPROTO_IPV6) {
 806                         assert(p->family == AF_INET6);
 807
 808                         switch (cmsg->cmsg_type) {
 809
 810                         case IPV6_PKTINFO: {
 811                                 struct in6_pktinfo *i = (struct in6_pktinfo*) CMSG_DATA(cmsg);
 812
 813                                 if (p->ifindex <= 0)
 814                                         p->ifindex = i->ipi6_ifindex;
 815
 816                                 p->destination.in6 = i->ipi6_addr;
 817                                 break;
 818                         }
 819
 820                         case IPV6_HOPLIMIT:
 821                                 p->ttl = *(int *) CMSG_DATA(cmsg);
 822                                 break;
 823
 824                         }
 825                 } else if (cmsg->cmsg_level == IPPROTO_IP) {
 826                         assert(p->family == AF_INET);
 827
 828                         switch (cmsg->cmsg_type) {
 829
 830                         case IP_PKTINFO: {
 831                                 struct in_pktinfo *i = (struct in_pktinfo*) CMSG_DATA(cmsg);
 832
 833                                 if (p->ifindex <= 0)
 834                                         p->ifindex = i->ipi_ifindex;
 835
 836                                 p->destination.in = i->ipi_addr;
 837                                 break;
 838                         }
 839
 840                         case IP_TTL:
 841                                 p->ttl = *(int *) CMSG_DATA(cmsg);
 842                                 break;
 843                         }
 844                 }
 845         }
 846
 847         /* The Linux kernel sets the interface index to the loopback
 848          * device if the packet came from the local host since it
 849          * avoids the routing table in such a case. Let's unset the
 850          * interface index in such a case. */
 851         if (p->ifindex == LOOPBACK_IFINDEX)
 852                 p->ifindex = 0;
 853
 854         if (protocol != DNS_PROTOCOL_DNS) {
 855                 /* If we don't know the interface index still, we look for the
 856                  * first local interface with a matching address. Yuck! */
 857                 if (p->ifindex <= 0)
 858                         p->ifindex = manager_find_ifindex(m, p->family, &p->destination);
 859         }
 860
 861         *ret = TAKE_PTR(p);
 862
 863         return 1;
 864 }
 865
 866 static int sendmsg_loop(int fd, struct msghdr *mh, int flags) {
 867         int r;
 868
 869         assert(fd >= 0);
 870         assert(mh);
 871
 872         for (;;) {
 873                 if (sendmsg(fd, mh, flags) >= 0)
 874                         return 0;
 875
 876                 if (errno == EINTR)
 877                         continue;
 878
 879                 if (errno != EAGAIN)
 880                         return -errno;
 881
 882                 r = fd_wait_for_event(fd, POLLOUT, SEND_TIMEOUT_USEC);
 883                 if (r < 0)
 884                         return r;
 885                 if (r == 0)
 886                         return -ETIMEDOUT;
 887         }
 888 }
 889
 890 static int write_loop(int fd, void *message, size_t length) {
 891         int r;
 892
 893         assert(fd >= 0);
 894         assert(message);
 895
 896         for (;;) {
 897                 if (write(fd, message, length) >= 0)
 898                         return 0;
 899
 900                 if (errno == EINTR)
 901                         continue;
 902
 903                 if (errno != EAGAIN)
 904                         return -errno;
 905
 906                 r = fd_wait_for_event(fd, POLLOUT, SEND_TIMEOUT_USEC);
 907                 if (r < 0)
 908                         return r;
 909                 if (r == 0)
 910                         return -ETIMEDOUT;
 911         }
 912 }
 913
 914 int manager_write(Manager *m, int fd, DnsPacket *p) {
 915         int r;
 916
 917         log_debug("Sending %s packet with id %" PRIu16 ".", DNS_PACKET_QR(p) ? "response" : "query", DNS_PACKET_ID(p));
 918
 919         r = write_loop(fd, DNS_PACKET_DATA(p), p->size);
 920         if (r < 0)
 921                 return r;
 922
 923         return 0;
 924 }
 925
 926 static int manager_ipv4_send(
 927                 Manager *m,
 928                 int fd,
 929                 int ifindex,
 930                 const struct in_addr *destination,
 931                 uint16_t port,
 932                 const struct in_addr *source,
 933                 DnsPacket *p) {
 934         union {
 935                 struct cmsghdr header; /* For alignment */
 936                 uint8_t buffer[CMSG_SPACE(sizeof(struct in_pktinfo))];
 937         } control = {};
 938         union sockaddr_union sa;
 939         struct iovec iov;
 940         struct msghdr mh = {
 941                 .msg_iov = &iov,
 942                 .msg_iovlen = 1,
 943                 .msg_name = &sa.sa,
 944                 .msg_namelen = sizeof(sa.in),
 945         };
 946
 947         assert(m);
 948         assert(fd >= 0);
 949         assert(destination);
 950         assert(port > 0);
 951         assert(p);
 952
 953         iov = IOVEC_MAKE(DNS_PACKET_DATA(p), p->size);
 954
 955         sa = (union sockaddr_union) {
 956                 .in.sin_family = AF_INET,
 957                 .in.sin_addr = *destination,
 958                 .in.sin_port = htobe16(port),
 959         };
 960
 961         if (ifindex > 0) {
 962                 struct cmsghdr *cmsg;
 963                 struct in_pktinfo *pi;
 964
 965                 mh.msg_control = &control;
 966                 mh.msg_controllen = CMSG_LEN(sizeof(struct in_pktinfo));
 967
 968                 cmsg = CMSG_FIRSTHDR(&mh);
 969                 cmsg->cmsg_len = mh.msg_controllen;
 970                 cmsg->cmsg_level = IPPROTO_IP;
 971                 cmsg->cmsg_type = IP_PKTINFO;
 972
 973                 pi = (struct in_pktinfo*) CMSG_DATA(cmsg);
 974                 pi->ipi_ifindex = ifindex;
 975
 976                 if (source)
 977                         pi->ipi_spec_dst = *source;
 978         }
 979
 980         return sendmsg_loop(fd, &mh, 0);
 981 }
 982
 983 static int manager_ipv6_send(
 984                 Manager *m,
 985                 int fd,
 986                 int ifindex,
 987                 const struct in6_addr *destination,
 988                 uint16_t port,
 989                 const struct in6_addr *source,
 990                 DnsPacket *p) {
 991
 992         union {
 993                 struct cmsghdr header; /* For alignment */
 994                 uint8_t buffer[CMSG_SPACE(sizeof(struct in6_pktinfo))];
 995         } control = {};
 996         union sockaddr_union sa;
 997         struct iovec iov;
 998         struct msghdr mh = {
 999                 .msg_iov = &iov,
1000                 .msg_iovlen = 1,
1001                 .msg_name = &sa.sa,
1002                 .msg_namelen = sizeof(sa.in6),
1003         };
1004
1005         assert(m);
1006         assert(fd >= 0);
1007         assert(destination);
1008         assert(port > 0);
1009         assert(p);
1010
1011         iov = IOVEC_MAKE(DNS_PACKET_DATA(p), p->size);
1012
1013         sa = (union sockaddr_union) {
1014                 .in6.sin6_family = AF_INET6,
1015                 .in6.sin6_addr = *destination,
1016                 .in6.sin6_port = htobe16(port),
1017                 .in6.sin6_scope_id = ifindex,
1018         };
1019
1020         if (ifindex > 0) {
1021                 struct cmsghdr *cmsg;
1022                 struct in6_pktinfo *pi;
1023
1024                 mh.msg_control = &control;
1025                 mh.msg_controllen = CMSG_LEN(sizeof(struct in6_pktinfo));
1026
1027                 cmsg = CMSG_FIRSTHDR(&mh);
1028                 cmsg->cmsg_len = mh.msg_controllen;
1029                 cmsg->cmsg_level = IPPROTO_IPV6;
1030                 cmsg->cmsg_type = IPV6_PKTINFO;
1031
1032                 pi = (struct in6_pktinfo*) CMSG_DATA(cmsg);
1033                 pi->ipi6_ifindex = ifindex;
1034
1035                 if (source)
1036                         pi->ipi6_addr = *source;
1037         }
1038
1039         return sendmsg_loop(fd, &mh, 0);
1040 }
1041
1042 int manager_send(
1043                 Manager *m,
1044                 int fd,
1045                 int ifindex,
1046                 int family,
1047                 const union in_addr_union *destination,
1048                 uint16_t port,
1049                 const union in_addr_union *source,
1050                 DnsPacket *p) {
1051
1052         assert(m);
1053         assert(fd >= 0);
1054         assert(destination);
1055         assert(port > 0);
1056         assert(p);
1057
1058         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));
1059
1060         if (family == AF_INET)
1061                 return manager_ipv4_send(m, fd, ifindex, &destination->in, port, source ? &source->in : NULL, p);
1062         if (family == AF_INET6)
1063                 return manager_ipv6_send(m, fd, ifindex, &destination->in6, port, source ? &source->in6 : NULL, p);
1064
1065         return -EAFNOSUPPORT;
1066 }
1067
1068 uint32_t manager_find_mtu(Manager *m) {
1069         uint32_t mtu = 0;
1070         Link *l;
1071         Iterator i;
1072
1073         /* If we don't know on which link a DNS packet would be
1074          * delivered, let's find the largest MTU that works on all
1075          * interfaces we know of */
1076
1077         HASHMAP_FOREACH(l, m->links, i) {
1078                 if (l->mtu <= 0)
1079                         continue;
1080
1081                 if (mtu <= 0 || l->mtu < mtu)
1082                         mtu = l->mtu;
1083         }
1084
1085         return mtu;
1086 }
1087
1088 int manager_find_ifindex(Manager *m, int family, const union in_addr_union *in_addr) {
1089         LinkAddress *a;
1090
1091         assert(m);
1092
1093         a = manager_find_link_address(m, family, in_addr);
1094         if (a)
1095                 return a->link->ifindex;
1096
1097         return 0;
1098 }
1099
1100 void manager_refresh_rrs(Manager *m) {
1101         Iterator i;
1102         Link *l;
1103         DnssdService *s;
1104
1105         assert(m);
1106
1107         m->llmnr_host_ipv4_key = dns_resource_key_unref(m->llmnr_host_ipv4_key);
1108         m->llmnr_host_ipv6_key = dns_resource_key_unref(m->llmnr_host_ipv6_key);
1109         m->mdns_host_ipv4_key = dns_resource_key_unref(m->mdns_host_ipv4_key);
1110         m->mdns_host_ipv6_key = dns_resource_key_unref(m->mdns_host_ipv6_key);
1111
1112         if (m->mdns_support == RESOLVE_SUPPORT_YES)
1113                 HASHMAP_FOREACH(s, m->dnssd_services, i)
1114                         if (dnssd_update_rrs(s) < 0)
1115                                 log_warning("Failed to refresh DNS-SD service '%s'", s->name);
1116
1117         HASHMAP_FOREACH(l, m->links, i) {
1118                 link_add_rrs(l, true);
1119                 link_add_rrs(l, false);
1120         }
1121 }
1122
1123 static int manager_next_random_name(const char *old, char **ret_new) {
1124         const char *p;
1125         uint64_t u, a;
1126         char *n;
1127
1128         p = strchr(old, 0);
1129         assert(p);
1130
1131         while (p > old) {
1132                 if (!strchr(DIGITS, p[-1]))
1133                         break;
1134
1135                 p--;
1136         }
1137
1138         if (*p == 0 || safe_atou64(p, &u) < 0 || u <= 0)
1139                 u = 1;
1140
1141         /* Add a random number to the old value. This way we can avoid
1142          * that two hosts pick the same hostname, win on IPv4 and lose
1143          * on IPv6 (or vice versa), and pick the same hostname
1144          * replacement hostname, ad infinitum. We still want the
1145          * numbers to go up monotonically, hence we just add a random
1146          * value 1..10 */
1147
1148         random_bytes(&a, sizeof(a));
1149         u += 1 + a % 10;
1150
1151         if (asprintf(&n, "%.*s%" PRIu64, (int) (p - old), old, u) < 0)
1152                 return -ENOMEM;
1153
1154         *ret_new = n;
1155
1156         return 0;
1157 }
1158
1159 int manager_next_hostname(Manager *m) {
1160         _cleanup_free_ char *h = NULL, *k = NULL;
1161         int r;
1162
1163         assert(m);
1164
1165         r = manager_next_random_name(m->llmnr_hostname, &h);
1166         if (r < 0)
1167                 return r;
1168
1169         r = dns_name_concat(h, "local", 0, &k);
1170         if (r < 0)
1171                 return r;
1172
1173         log_info("Hostname conflict, changing published hostname from '%s' to '%s'.", m->llmnr_hostname, h);
1174
1175         free_and_replace(m->llmnr_hostname, h);
1176         free_and_replace(m->mdns_hostname, k);
1177
1178         manager_refresh_rrs(m);
1179         (void) manager_send_changed(m, "LLMNRHostname");
1180
1181         return 0;
1182 }
1183
1184 LinkAddress* manager_find_link_address(Manager *m, int family, const union in_addr_union *in_addr) {
1185         Iterator i;
1186         Link *l;
1187
1188         assert(m);
1189
1190         HASHMAP_FOREACH(l, m->links, i) {
1191                 LinkAddress *a;
1192
1193                 a = link_find_address(l, family, in_addr);
1194                 if (a)
1195                         return a;
1196         }
1197
1198         return NULL;
1199 }
1200
1201 bool manager_our_packet(Manager *m, DnsPacket *p) {
1202         assert(m);
1203         assert(p);
1204
1205         return !!manager_find_link_address(m, p->family, &p->sender);
1206 }
1207
1208 DnsScope* manager_find_scope(Manager *m, DnsPacket *p) {
1209         Link *l;
1210
1211         assert(m);
1212         assert(p);
1213
1214         l = hashmap_get(m->links, INT_TO_PTR(p->ifindex));
1215         if (!l)
1216                 return NULL;
1217
1218         switch (p->protocol) {
1219         case DNS_PROTOCOL_LLMNR:
1220                 if (p->family == AF_INET)
1221                         return l->llmnr_ipv4_scope;
1222                 else if (p->family == AF_INET6)
1223                         return l->llmnr_ipv6_scope;
1224
1225                 break;
1226
1227         case DNS_PROTOCOL_MDNS:
1228                 if (p->family == AF_INET)
1229                         return l->mdns_ipv4_scope;
1230                 else if (p->family == AF_INET6)
1231                         return l->mdns_ipv6_scope;
1232
1233                 break;
1234
1235         default:
1236                 break;
1237         }
1238
1239         return NULL;
1240 }
1241
1242 void manager_verify_all(Manager *m) {
1243         DnsScope *s;
1244
1245         assert(m);
1246
1247         LIST_FOREACH(scopes, s, m->dns_scopes)
1248                 dns_zone_verify_all(&s->zone);
1249 }
1250
1251 int manager_is_own_hostname(Manager *m, const char *name) {
1252         int r;
1253
1254         assert(m);
1255         assert(name);
1256
1257         if (m->llmnr_hostname) {
1258                 r = dns_name_equal(name, m->llmnr_hostname);
1259                 if (r != 0)
1260                         return r;
1261         }
1262
1263         if (m->mdns_hostname) {
1264                 r = dns_name_equal(name, m->mdns_hostname);
1265                 if (r != 0)
1266                         return r;
1267         }
1268
1269         if (m->full_hostname)
1270                 return dns_name_equal(name, m->full_hostname);
1271
1272         return 0;
1273 }
1274
1275 int manager_compile_dns_servers(Manager *m, OrderedSet **dns) {
1276         DnsServer *s;
1277         Iterator i;
1278         Link *l;
1279         int r;
1280
1281         assert(m);
1282         assert(dns);
1283
1284         r = ordered_set_ensure_allocated(dns, &dns_server_hash_ops);
1285         if (r < 0)
1286                 return r;
1287
1288         /* First add the system-wide servers and domains */
1289         LIST_FOREACH(servers, s, m->dns_servers) {
1290                 r = ordered_set_put(*dns, s);
1291                 if (r == -EEXIST)
1292                         continue;
1293                 if (r < 0)
1294                         return r;
1295         }
1296
1297         /* Then, add the per-link servers */
1298         HASHMAP_FOREACH(l, m->links, i) {
1299                 LIST_FOREACH(servers, s, l->dns_servers) {
1300                         r = ordered_set_put(*dns, s);
1301                         if (r == -EEXIST)
1302                                 continue;
1303                         if (r < 0)
1304                                 return r;
1305                 }
1306         }
1307
1308         /* If we found nothing, add the fallback servers */
1309         if (ordered_set_isempty(*dns)) {
1310                 LIST_FOREACH(servers, s, m->fallback_dns_servers) {
1311                         r = ordered_set_put(*dns, s);
1312                         if (r == -EEXIST)
1313                                 continue;
1314                         if (r < 0)
1315                                 return r;
1316                 }
1317         }
1318
1319         return 0;
1320 }
1321
1322 /* filter_route is a tri-state:
1323  *   < 0: no filtering
1324  *   = 0 or false: return only domains which should be used for searching
1325  *   > 0 or true: return only domains which are for routing only
1326  */
1327 int manager_compile_search_domains(Manager *m, OrderedSet **domains, int filter_route) {
1328         DnsSearchDomain *d;
1329         Iterator i;
1330         Link *l;
1331         int r;
1332
1333         assert(m);
1334         assert(domains);
1335
1336         r = ordered_set_ensure_allocated(domains, &dns_name_hash_ops);
1337         if (r < 0)
1338                 return r;
1339
1340         LIST_FOREACH(domains, d, m->search_domains) {
1341
1342                 if (filter_route >= 0 &&
1343                     d->route_only != !!filter_route)
1344                         continue;
1345
1346                 r = ordered_set_put(*domains, d->name);
1347                 if (r == -EEXIST)
1348                         continue;
1349                 if (r < 0)
1350                         return r;
1351         }
1352
1353         HASHMAP_FOREACH(l, m->links, i) {
1354
1355                 LIST_FOREACH(domains, d, l->search_domains) {
1356
1357                         if (filter_route >= 0 &&
1358                             d->route_only != !!filter_route)
1359                                 continue;
1360
1361                         r = ordered_set_put(*domains, d->name);
1362                         if (r == -EEXIST)
1363                                 continue;
1364                         if (r < 0)
1365                                 return r;
1366                 }
1367         }
1368
1369         return 0;
1370 }
1371
1372 DnssecMode manager_get_dnssec_mode(Manager *m) {
1373         assert(m);
1374
1375         if (m->dnssec_mode != _DNSSEC_MODE_INVALID)
1376                 return m->dnssec_mode;
1377
1378         return DNSSEC_NO;
1379 }
1380
1381 bool manager_dnssec_supported(Manager *m) {
1382         DnsServer *server;
1383         Iterator i;
1384         Link *l;
1385
1386         assert(m);
1387
1388         if (manager_get_dnssec_mode(m) == DNSSEC_NO)
1389                 return false;
1390
1391         server = manager_get_dns_server(m);
1392         if (server && !dns_server_dnssec_supported(server))
1393                 return false;
1394
1395         HASHMAP_FOREACH(l, m->links, i)
1396                 if (!link_dnssec_supported(l))
1397                         return false;
1398
1399         return true;
1400 }
1401
1402 DnsOverTlsMode manager_get_dns_over_tls_mode(Manager *m) {
1403         assert(m);
1404
1405         if (m->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
1406                 return m->dns_over_tls_mode;
1407
1408         return DNS_OVER_TLS_NO;
1409 }
1410
1411 void manager_dnssec_verdict(Manager *m, DnssecVerdict verdict, const DnsResourceKey *key) {
1412
1413         assert(verdict >= 0);
1414         assert(verdict < _DNSSEC_VERDICT_MAX);
1415
1416         if (DEBUG_LOGGING) {
1417                 char s[DNS_RESOURCE_KEY_STRING_MAX];
1418
1419                 log_debug("Found verdict for lookup %s: %s",
1420                           dns_resource_key_to_string(key, s, sizeof s),
1421                           dnssec_verdict_to_string(verdict));
1422         }
1423
1424         m->n_dnssec_verdict[verdict]++;
1425 }
1426
1427 bool manager_routable(Manager *m, int family) {
1428         Iterator i;
1429         Link *l;
1430
1431         assert(m);
1432
1433         /* Returns true if the host has at least one interface with a routable address of the specified type */
1434
1435         HASHMAP_FOREACH(l, m->links, i)
1436                 if (link_relevant(l, family, false))
1437                         return true;
1438
1439         return false;
1440 }
1441
1442 void manager_flush_caches(Manager *m) {
1443         DnsScope *scope;
1444
1445         assert(m);
1446
1447         LIST_FOREACH(scopes, scope, m->dns_scopes)
1448                 dns_cache_flush(&scope->cache);
1449
1450         log_info("Flushed all caches.");
1451 }
1452
1453 void manager_reset_server_features(Manager *m) {
1454         Iterator i;
1455         Link *l;
1456
1457         dns_server_reset_features_all(m->dns_servers);
1458         dns_server_reset_features_all(m->fallback_dns_servers);
1459
1460         HASHMAP_FOREACH(l, m->links, i)
1461                 dns_server_reset_features_all(l->dns_servers);
1462
1463         log_info("Resetting learnt feature levels on all servers.");
1464 }
1465
1466 void manager_cleanup_saved_user(Manager *m) {
1467         _cleanup_closedir_ DIR *d = NULL;
1468         struct dirent *de;
1469
1470         assert(m);
1471
1472         /* Clean up all saved per-link files in /run/systemd/resolve/netif/ that don't have a matching interface
1473          * anymore. These files are created to persist settings pushed in by the user via the bus, so that resolved can
1474          * be restarted without losing this data. */
1475
1476         d = opendir("/run/systemd/resolve/netif/");
1477         if (!d) {
1478                 if (errno == ENOENT)
1479                         return;
1480
1481                 log_warning_errno(errno, "Failed to open interface directory: %m");
1482                 return;
1483         }
1484
1485         FOREACH_DIRENT_ALL(de, d, log_error_errno(errno, "Failed to read interface directory: %m")) {
1486                 _cleanup_free_ char *p = NULL;
1487                 int ifindex;
1488                 Link *l;
1489
1490                 if (!IN_SET(de->d_type, DT_UNKNOWN, DT_REG))
1491                         continue;
1492
1493                 if (dot_or_dot_dot(de->d_name))
1494                         continue;
1495
1496                 ifindex = parse_ifindex(de->d_name);
1497                 if (ifindex < 0) /* Probably some temporary file from a previous run. Delete it */
1498                         goto rm;
1499
1500                 l = hashmap_get(m->links, INT_TO_PTR(ifindex));
1501                 if (!l) /* link vanished */
1502                         goto rm;
1503
1504                 if (l->is_managed) /* now managed by networkd, hence the bus settings are useless */
1505                         goto rm;
1506
1507                 continue;
1508
1509         rm:
1510                 p = path_join("/run/systemd/resolve/netif", de->d_name);
1511                 if (!p) {
1512                         log_oom();
1513                         return;
1514                 }
1515
1516                 (void) unlink(p);
1517         }
1518 }
1519
1520 bool manager_next_dnssd_names(Manager *m) {
1521         Iterator i;
1522         DnssdService *s;
1523         bool tried = false;
1524         int r;
1525
1526         assert(m);
1527
1528         HASHMAP_FOREACH(s, m->dnssd_services, i) {
1529                 _cleanup_free_ char * new_name = NULL;
1530
1531                 if (!s->withdrawn)
1532                         continue;
1533
1534                 r = manager_next_random_name(s->name_template, &new_name);
1535                 if (r < 0) {
1536                         log_warning_errno(r, "Failed to get new name for service '%s': %m", s->name);
1537                         continue;
1538                 }
1539
1540                 free_and_replace(s->name_template, new_name);
1541
1542                 s->withdrawn = false;
1543
1544                 tried = true;
1545         }
1546
1547         if (tried)
1548                 manager_refresh_rrs(m);
1549
1550         return tried;
1551 }