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 "resolved-varlink.h"
  40 #include "socket-util.h"
  41 #include "string-table.h"
  42 #include "string-util.h"
  43 #include "utf8.h"
  44
  45 #define SEND_TIMEOUT_USEC (200 * USEC_PER_MSEC)
  46
  47 static int manager_process_link(sd_netlink *rtnl, sd_netlink_message *mm, void *userdata) {
  48         Manager *m = userdata;
  49         uint16_t type;
  50         Link *l;
  51         int ifindex, r;
  52
  53         assert(rtnl);
  54         assert(m);
  55         assert(mm);
  56
  57         r = sd_netlink_message_get_type(mm, &type);
  58         if (r < 0)
  59                 goto fail;
  60
  61         r = sd_rtnl_message_link_get_ifindex(mm, &ifindex);
  62         if (r < 0)
  63                 goto fail;
  64
  65         l = hashmap_get(m->links, INT_TO_PTR(ifindex));
  66
  67         switch (type) {
  68
  69         case RTM_NEWLINK:{
  70                 bool is_new = !l;
  71
  72                 if (!l) {
  73                         r = link_new(m, &l, ifindex);
  74                         if (r < 0)
  75                                 goto fail;
  76                 }
  77
  78                 r = link_process_rtnl(l, mm);
  79                 if (r < 0)
  80                         goto fail;
  81
  82                 r = link_update(l);
  83                 if (r < 0)
  84                         goto fail;
  85
  86                 if (is_new)
  87                         log_debug("Found new link %i/%s", ifindex, l->ifname);
  88
  89                 break;
  90         }
  91
  92         case RTM_DELLINK:
  93                 if (l) {
  94                         log_debug("Removing link %i/%s", l->ifindex, l->ifname);
  95                         link_remove_user(l);
  96                         link_free(l);
  97                 }
  98
  99                 break;
 100         }
 101
 102         return 0;
 103
 104 fail:
 105         log_warning_errno(r, "Failed to process RTNL link message: %m");
 106         return 0;
 107 }
 108
 109 static int manager_process_address(sd_netlink *rtnl, sd_netlink_message *mm, void *userdata) {
 110         Manager *m = userdata;
 111         union in_addr_union address;
 112         uint16_t type;
 113         int r, ifindex, family;
 114         LinkAddress *a;
 115         Link *l;
 116
 117         assert(rtnl);
 118         assert(mm);
 119         assert(m);
 120
 121         r = sd_netlink_message_get_type(mm, &type);
 122         if (r < 0)
 123                 goto fail;
 124
 125         r = sd_rtnl_message_addr_get_ifindex(mm, &ifindex);
 126         if (r < 0)
 127                 goto fail;
 128
 129         l = hashmap_get(m->links, INT_TO_PTR(ifindex));
 130         if (!l)
 131                 return 0;
 132
 133         r = sd_rtnl_message_addr_get_family(mm, &family);
 134         if (r < 0)
 135                 goto fail;
 136
 137         switch (family) {
 138
 139         case AF_INET:
 140                 r = sd_netlink_message_read_in_addr(mm, IFA_LOCAL, &address.in);
 141                 if (r < 0) {
 142                         r = sd_netlink_message_read_in_addr(mm, IFA_ADDRESS, &address.in);
 143                         if (r < 0)
 144                                 goto fail;
 145                 }
 146
 147                 break;
 148
 149         case AF_INET6:
 150                 r = sd_netlink_message_read_in6_addr(mm, IFA_LOCAL, &address.in6);
 151                 if (r < 0) {
 152                         r = sd_netlink_message_read_in6_addr(mm, IFA_ADDRESS, &address.in6);
 153                         if (r < 0)
 154                                 goto fail;
 155                 }
 156
 157                 break;
 158
 159         default:
 160                 return 0;
 161         }
 162
 163         a = link_find_address(l, family, &address);
 164
 165         switch (type) {
 166
 167         case RTM_NEWADDR:
 168
 169                 if (!a) {
 170                         r = link_address_new(l, &a, family, &address);
 171                         if (r < 0)
 172                                 return r;
 173                 }
 174
 175                 r = link_address_update_rtnl(a, mm);
 176                 if (r < 0)
 177                         return r;
 178
 179                 break;
 180
 181         case RTM_DELADDR:
 182                 link_address_free(a);
 183                 break;
 184         }
 185
 186         return 0;
 187
 188 fail:
 189         log_warning_errno(r, "Failed to process RTNL address message: %m");
 190         return 0;
 191 }
 192
 193 static int manager_rtnl_listen(Manager *m) {
 194         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL;
 195         sd_netlink_message *i;
 196         int r;
 197
 198         assert(m);
 199
 200         /* First, subscribe to interfaces coming and going */
 201         r = sd_netlink_open(&m->rtnl);
 202         if (r < 0)
 203                 return r;
 204
 205         r = sd_netlink_attach_event(m->rtnl, m->event, SD_EVENT_PRIORITY_IMPORTANT);
 206         if (r < 0)
 207                 return r;
 208
 209         r = sd_netlink_add_match(m->rtnl, NULL, RTM_NEWLINK, manager_process_link, NULL, m, "resolve-NEWLINK");
 210         if (r < 0)
 211                 return r;
 212
 213         r = sd_netlink_add_match(m->rtnl, NULL, RTM_DELLINK, manager_process_link, NULL, m, "resolve-DELLINK");
 214         if (r < 0)
 215                 return r;
 216
 217         r = sd_netlink_add_match(m->rtnl, NULL, RTM_NEWADDR, manager_process_address, NULL, m, "resolve-NEWADDR");
 218         if (r < 0)
 219                 return r;
 220
 221         r = sd_netlink_add_match(m->rtnl, NULL, RTM_DELADDR, manager_process_address, NULL, m, "resolve-DELADDR");
 222         if (r < 0)
 223                 return r;
 224
 225         /* Then, enumerate all links */
 226         r = sd_rtnl_message_new_link(m->rtnl, &req, RTM_GETLINK, 0);
 227         if (r < 0)
 228                 return r;
 229
 230         r = sd_netlink_message_request_dump(req, true);
 231         if (r < 0)
 232                 return r;
 233
 234         r = sd_netlink_call(m->rtnl, req, 0, &reply);
 235         if (r < 0)
 236                 return r;
 237
 238         for (i = reply; i; i = sd_netlink_message_next(i)) {
 239                 r = manager_process_link(m->rtnl, i, m);
 240                 if (r < 0)
 241                         return r;
 242         }
 243
 244         req = sd_netlink_message_unref(req);
 245         reply = sd_netlink_message_unref(reply);
 246
 247         /* Finally, enumerate all addresses, too */
 248         r = sd_rtnl_message_new_addr(m->rtnl, &req, RTM_GETADDR, 0, AF_UNSPEC);
 249         if (r < 0)
 250                 return r;
 251
 252         r = sd_netlink_message_request_dump(req, true);
 253         if (r < 0)
 254                 return r;
 255
 256         r = sd_netlink_call(m->rtnl, req, 0, &reply);
 257         if (r < 0)
 258                 return r;
 259
 260         for (i = reply; i; i = sd_netlink_message_next(i)) {
 261                 r = manager_process_address(m->rtnl, i, m);
 262                 if (r < 0)
 263                         return r;
 264         }
 265
 266         return r;
 267 }
 268
 269 static int on_network_event(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
 270         Manager *m = userdata;
 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) {
 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 hostname: %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_errno(SYNTHETIC_ERRNO(EUCLEAN),
 353                                        "Failed to undo IDNA: %s", idn2_strerror(r));
 354         assert(utf8_is_valid(utf8));
 355
 356         r = strlen(utf8);
 357         decoded = utf8;
 358 #elif HAVE_LIBIDN
 359         k = dns_label_undo_idna(label, r, label, sizeof label);
 360         if (k < 0)
 361                 return log_error_errno(k, "Failed to undo IDNA: %m");
 362         if (k > 0)
 363                 r = k;
 364
 365         if (!utf8_is_valid(label))
 366                 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
 367                                        "System hostname is not UTF-8 clean.");
 368         decoded = label;
 369 #else
 370         decoded = label; /* no decoding */
 371 #endif
 372
 373         r = dns_label_escape_new(decoded, r, &n);
 374         if (r < 0)
 375                 return log_error_errno(r, "Failed to escape hostname: %m");
 376
 377         if (is_localhost(n))
 378                 return log_debug_errno(SYNTHETIC_ERRNO(EINVAL),
 379                                        "System hostname is 'localhost', ignoring.");
 380
 381         r = dns_name_concat(n, "local", 0, mdns_hostname);
 382         if (r < 0)
 383                 return log_error_errno(r, "Failed to determine mDNS hostname: %m");
 384
 385         *llmnr_hostname = TAKE_PTR(n);
 386         *full_hostname = TAKE_PTR(h);
 387
 388         return 0;
 389 }
 390
 391 static const char *fallback_hostname(void) {
 392
 393         /* Determine the fall back hostname. For exposing this system to the outside world, we cannot have it to be
 394          * "localhost" even if that's the compiled in hostname. In this case, let's revert to "linux" instead. */
 395
 396         if (is_localhost(FALLBACK_HOSTNAME))
 397                 return "linux";
 398
 399         return FALLBACK_HOSTNAME;
 400 }
 401
 402 static int make_fallback_hostnames(char **full_hostname, char **llmnr_hostname, char **mdns_hostname) {
 403         _cleanup_free_ char *n = NULL, *m = NULL;
 404         char label[DNS_LABEL_MAX], *h;
 405         const char *p;
 406         int r;
 407
 408         assert(full_hostname);
 409         assert(llmnr_hostname);
 410         assert(mdns_hostname);
 411
 412         p = fallback_hostname();
 413         r = dns_label_unescape(&p, label, sizeof label, 0);
 414         if (r < 0)
 415                 return log_error_errno(r, "Failed to unescape fallback hostname: %m");
 416
 417         assert(r > 0); /* The fallback hostname must have at least one label */
 418
 419         r = dns_label_escape_new(label, r, &n);
 420         if (r < 0)
 421                 return log_error_errno(r, "Failed to escape fallback hostname: %m");
 422
 423         r = dns_name_concat(n, "local", 0, &m);
 424         if (r < 0)
 425                 return log_error_errno(r, "Failed to concatenate mDNS hostname: %m");
 426
 427         h = strdup(fallback_hostname());
 428         if (!h)
 429                 return log_oom();
 430
 431         *llmnr_hostname = TAKE_PTR(n);
 432         *mdns_hostname = TAKE_PTR(m);
 433
 434         *full_hostname = h;
 435
 436         return 0;
 437 }
 438
 439 static int on_hostname_change(sd_event_source *es, int fd, uint32_t revents, void *userdata) {
 440         _cleanup_free_ char *full_hostname = NULL, *llmnr_hostname = NULL, *mdns_hostname = NULL;
 441         Manager *m = userdata;
 442         bool llmnr_hostname_changed;
 443         int r;
 444
 445         assert(m);
 446
 447         r = determine_hostname(&full_hostname, &llmnr_hostname, &mdns_hostname);
 448         if (r < 0)
 449                 return 0; /* ignore invalid hostnames */
 450
 451         llmnr_hostname_changed = !streq(llmnr_hostname, m->llmnr_hostname);
 452         if (streq(full_hostname, m->full_hostname) &&
 453             !llmnr_hostname_changed &&
 454             streq(mdns_hostname, m->mdns_hostname))
 455                 return 0;
 456
 457         log_info("System hostname changed to '%s'.", full_hostname);
 458
 459         free_and_replace(m->full_hostname, full_hostname);
 460         free_and_replace(m->llmnr_hostname, llmnr_hostname);
 461         free_and_replace(m->mdns_hostname, mdns_hostname);
 462
 463         manager_refresh_rrs(m);
 464         (void) manager_send_changed(m, "LLMNRHostname");
 465
 466         return 0;
 467 }
 468
 469 static int manager_watch_hostname(Manager *m) {
 470         int r;
 471
 472         assert(m);
 473
 474         m->hostname_fd = open("/proc/sys/kernel/hostname",
 475                               O_RDONLY|O_CLOEXEC|O_NONBLOCK|O_NOCTTY);
 476         if (m->hostname_fd < 0) {
 477                 log_warning_errno(errno, "Failed to watch hostname: %m");
 478                 return 0;
 479         }
 480
 481         r = sd_event_add_io(m->event, &m->hostname_event_source, m->hostname_fd, 0, on_hostname_change, m);
 482         if (r < 0) {
 483                 if (r == -EPERM)
 484                         /* kernels prior to 3.2 don't support polling this file. Ignore the failure. */
 485                         m->hostname_fd = safe_close(m->hostname_fd);
 486                 else
 487                         return log_error_errno(r, "Failed to add hostname event source: %m");
 488         }
 489
 490         (void) sd_event_source_set_description(m->hostname_event_source, "hostname");
 491
 492         r = determine_hostname(&m->full_hostname, &m->llmnr_hostname, &m->mdns_hostname);
 493         if (r < 0) {
 494                 log_info("Defaulting to hostname '%s'.", fallback_hostname());
 495
 496                 r = make_fallback_hostnames(&m->full_hostname, &m->llmnr_hostname, &m->mdns_hostname);
 497                 if (r < 0)
 498                         return r;
 499         } else
 500                 log_info("Using system hostname '%s'.", m->full_hostname);
 501
 502         return 0;
 503 }
 504
 505 static int manager_sigusr1(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
 506         _cleanup_free_ char *buffer = NULL;
 507         _cleanup_fclose_ FILE *f = NULL;
 508         Manager *m = userdata;
 509         DnsServer *server;
 510         size_t size = 0;
 511         DnsScope *scope;
 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)
 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                 .hostname_fd = -1,
 581
 582                 .llmnr_support = DEFAULT_LLMNR_MODE,
 583                 .mdns_support = DEFAULT_MDNS_MODE,
 584                 .dnssec_mode = DEFAULT_DNSSEC_MODE,
 585                 .dns_over_tls_mode = DEFAULT_DNS_OVER_TLS_MODE,
 586                 .enable_cache = DNS_CACHE_MODE_YES,
 587                 .dns_stub_listener_mode = DNS_STUB_LISTENER_YES,
 588                 .read_resolv_conf = true,
 589                 .need_builtin_fallbacks = true,
 590                 .etc_hosts_last = USEC_INFINITY,
 591                 .etc_hosts_mtime = USEC_INFINITY,
 592                 .etc_hosts_ino = 0,
 593                 .etc_hosts_dev = 0,
 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         r = manager_varlink_init(m);
 665         if (r < 0)
 666                 return r;
 667
 668         return 0;
 669 }
 670
 671 Manager *manager_free(Manager *m) {
 672         Link *l;
 673         DnssdService *s;
 674
 675         if (!m)
 676                 return NULL;
 677
 678         dns_server_unlink_all(m->dns_servers);
 679         dns_server_unlink_all(m->fallback_dns_servers);
 680         dns_search_domain_unlink_all(m->search_domains);
 681
 682         while ((l = hashmap_first(m->links)))
 683                link_free(l);
 684
 685         while (m->dns_queries)
 686                 dns_query_free(m->dns_queries);
 687
 688         dns_scope_free(m->unicast_scope);
 689
 690         /* At this point only orphaned streams should remain. All others should have been freed already by their
 691          * owners */
 692         while (m->dns_streams)
 693                 dns_stream_unref(m->dns_streams);
 694
 695 #if ENABLE_DNS_OVER_TLS
 696         dnstls_manager_free(m);
 697 #endif
 698
 699         hashmap_free(m->links);
 700         hashmap_free(m->dns_transactions);
 701
 702         sd_event_source_unref(m->network_event_source);
 703         sd_network_monitor_unref(m->network_monitor);
 704
 705         sd_netlink_unref(m->rtnl);
 706         sd_event_source_unref(m->rtnl_event_source);
 707
 708         manager_llmnr_stop(m);
 709         manager_mdns_stop(m);
 710         manager_dns_stub_stop(m);
 711         manager_varlink_done(m);
 712
 713         ordered_set_free(m->dns_extra_stub_listeners);
 714
 715         bus_verify_polkit_async_registry_free(m->polkit_registry);
 716
 717         sd_bus_flush_close_unref(m->bus);
 718
 719         sd_event_source_unref(m->sigusr1_event_source);
 720         sd_event_source_unref(m->sigusr2_event_source);
 721         sd_event_source_unref(m->sigrtmin1_event_source);
 722
 723         sd_event_unref(m->event);
 724
 725         dns_resource_key_unref(m->llmnr_host_ipv4_key);
 726         dns_resource_key_unref(m->llmnr_host_ipv6_key);
 727         dns_resource_key_unref(m->mdns_host_ipv4_key);
 728         dns_resource_key_unref(m->mdns_host_ipv6_key);
 729
 730         sd_event_source_unref(m->hostname_event_source);
 731         safe_close(m->hostname_fd);
 732
 733         free(m->full_hostname);
 734         free(m->llmnr_hostname);
 735         free(m->mdns_hostname);
 736
 737         while ((s = hashmap_first(m->dnssd_services)))
 738                dnssd_service_free(s);
 739         hashmap_free(m->dnssd_services);
 740
 741         dns_trust_anchor_flush(&m->trust_anchor);
 742         manager_etc_hosts_flush(m);
 743
 744         return mfree(m);
 745 }
 746
 747 int manager_recv(Manager *m, int fd, DnsProtocol protocol, DnsPacket **ret) {
 748         _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL;
 749         CMSG_BUFFER_TYPE(CMSG_SPACE(MAXSIZE(struct in_pktinfo, struct in6_pktinfo))
 750                          + CMSG_SPACE(int) /* ttl/hoplimit */
 751                          + EXTRA_CMSG_SPACE /* kernel appears to require extra buffer space */) control;
 752         union sockaddr_union sa;
 753         struct iovec iov;
 754         struct msghdr mh = {
 755                 .msg_name = &sa.sa,
 756                 .msg_namelen = sizeof(sa),
 757                 .msg_iov = &iov,
 758                 .msg_iovlen = 1,
 759                 .msg_control = &control,
 760                 .msg_controllen = sizeof(control),
 761         };
 762         struct cmsghdr *cmsg;
 763         ssize_t ms, l;
 764         int r;
 765
 766         assert(m);
 767         assert(fd >= 0);
 768         assert(ret);
 769
 770         ms = next_datagram_size_fd(fd);
 771         if (ms < 0)
 772                 return ms;
 773
 774         r = dns_packet_new(&p, protocol, ms, DNS_PACKET_SIZE_MAX);
 775         if (r < 0)
 776                 return r;
 777
 778         iov = IOVEC_MAKE(DNS_PACKET_DATA(p), p->allocated);
 779
 780         l = recvmsg_safe(fd, &mh, 0);
 781         if (IN_SET(l, -EAGAIN, -EINTR))
 782                 return 0;
 783         if (l < 0)
 784                 return l;
 785         if (l == 0)
 786                 return 0;
 787
 788         assert(!(mh.msg_flags & MSG_TRUNC));
 789
 790         p->size = (size_t) l;
 791
 792         p->fd = fd;
 793         p->family = sa.sa.sa_family;
 794         p->ipproto = IPPROTO_UDP;
 795         if (p->family == AF_INET) {
 796                 p->sender.in = sa.in.sin_addr;
 797                 p->sender_port = be16toh(sa.in.sin_port);
 798         } else if (p->family == AF_INET6) {
 799                 p->sender.in6 = sa.in6.sin6_addr;
 800                 p->sender_port = be16toh(sa.in6.sin6_port);
 801                 p->ifindex = sa.in6.sin6_scope_id;
 802         } else
 803                 return -EAFNOSUPPORT;
 804
 805         CMSG_FOREACH(cmsg, &mh) {
 806
 807                 if (cmsg->cmsg_level == IPPROTO_IPV6) {
 808                         assert(p->family == AF_INET6);
 809
 810                         switch (cmsg->cmsg_type) {
 811
 812                         case IPV6_PKTINFO: {
 813                                 struct in6_pktinfo *i = (struct in6_pktinfo*) CMSG_DATA(cmsg);
 814
 815                                 if (p->ifindex <= 0)
 816                                         p->ifindex = i->ipi6_ifindex;
 817
 818                                 p->destination.in6 = i->ipi6_addr;
 819                                 break;
 820                         }
 821
 822                         case IPV6_HOPLIMIT:
 823                                 p->ttl = *(int *) CMSG_DATA(cmsg);
 824                                 break;
 825
 826                         }
 827                 } else if (cmsg->cmsg_level == IPPROTO_IP) {
 828                         assert(p->family == AF_INET);
 829
 830                         switch (cmsg->cmsg_type) {
 831
 832                         case IP_PKTINFO: {
 833                                 struct in_pktinfo *i = (struct in_pktinfo*) CMSG_DATA(cmsg);
 834
 835                                 if (p->ifindex <= 0)
 836                                         p->ifindex = i->ipi_ifindex;
 837
 838                                 p->destination.in = i->ipi_addr;
 839                                 break;
 840                         }
 841
 842                         case IP_TTL:
 843                                 p->ttl = *(int *) CMSG_DATA(cmsg);
 844                                 break;
 845                         }
 846                 }
 847         }
 848
 849         /* The Linux kernel sets the interface index to the loopback
 850          * device if the packet came from the local host since it
 851          * avoids the routing table in such a case. Let's unset the
 852          * interface index in such a case. */
 853         if (p->ifindex == LOOPBACK_IFINDEX)
 854                 p->ifindex = 0;
 855
 856         if (protocol != DNS_PROTOCOL_DNS) {
 857                 /* If we don't know the interface index still, we look for the
 858                  * first local interface with a matching address. Yuck! */
 859                 if (p->ifindex <= 0)
 860                         p->ifindex = manager_find_ifindex(m, p->family, &p->destination);
 861         }
 862
 863         *ret = TAKE_PTR(p);
 864
 865         return 1;
 866 }
 867
 868 static int sendmsg_loop(int fd, struct msghdr *mh, int flags) {
 869         int r;
 870
 871         assert(fd >= 0);
 872         assert(mh);
 873
 874         for (;;) {
 875                 if (sendmsg(fd, mh, flags) >= 0)
 876                         return 0;
 877
 878                 if (errno == EINTR)
 879                         continue;
 880
 881                 if (errno != EAGAIN)
 882                         return -errno;
 883
 884                 r = fd_wait_for_event(fd, POLLOUT, SEND_TIMEOUT_USEC);
 885                 if (r < 0)
 886                         return r;
 887                 if (r == 0)
 888                         return -ETIMEDOUT;
 889         }
 890 }
 891
 892 static int write_loop(int fd, void *message, size_t length) {
 893         int r;
 894
 895         assert(fd >= 0);
 896         assert(message);
 897
 898         for (;;) {
 899                 if (write(fd, message, length) >= 0)
 900                         return 0;
 901
 902                 if (errno == EINTR)
 903                         continue;
 904
 905                 if (errno != EAGAIN)
 906                         return -errno;
 907
 908                 r = fd_wait_for_event(fd, POLLOUT, SEND_TIMEOUT_USEC);
 909                 if (r < 0)
 910                         return r;
 911                 if (r == 0)
 912                         return -ETIMEDOUT;
 913         }
 914 }
 915
 916 int manager_write(Manager *m, int fd, DnsPacket *p) {
 917         int r;
 918
 919         log_debug("Sending %s packet with id %" PRIu16 ".", DNS_PACKET_QR(p) ? "response" : "query", DNS_PACKET_ID(p));
 920
 921         r = write_loop(fd, DNS_PACKET_DATA(p), p->size);
 922         if (r < 0)
 923                 return r;
 924
 925         return 0;
 926 }
 927
 928 static int manager_ipv4_send(
 929                 Manager *m,
 930                 int fd,
 931                 int ifindex,
 932                 const struct in_addr *destination,
 933                 uint16_t port,
 934                 const struct in_addr *source,
 935                 DnsPacket *p) {
 936
 937         CMSG_BUFFER_TYPE(CMSG_SPACE(sizeof(struct in_pktinfo))) 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 = sizeof(control);
 967
 968                 cmsg = CMSG_FIRSTHDR(&mh);
 969                 cmsg->cmsg_len = CMSG_LEN(sizeof(struct in_pktinfo));
 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         CMSG_BUFFER_TYPE(CMSG_SPACE(sizeof(struct in6_pktinfo))) control = {};
 993         union sockaddr_union sa;
 994         struct iovec iov;
 995         struct msghdr mh = {
 996                 .msg_iov = &iov,
 997                 .msg_iovlen = 1,
 998                 .msg_name = &sa.sa,
 999                 .msg_namelen = sizeof(sa.in6),
1000         };
1001
1002         assert(m);
1003         assert(fd >= 0);
1004         assert(destination);
1005         assert(port > 0);
1006         assert(p);
1007
1008         iov = IOVEC_MAKE(DNS_PACKET_DATA(p), p->size);
1009
1010         sa = (union sockaddr_union) {
1011                 .in6.sin6_family = AF_INET6,
1012                 .in6.sin6_addr = *destination,
1013                 .in6.sin6_port = htobe16(port),
1014                 .in6.sin6_scope_id = ifindex,
1015         };
1016
1017         if (ifindex > 0) {
1018                 struct cmsghdr *cmsg;
1019                 struct in6_pktinfo *pi;
1020
1021                 mh.msg_control = &control;
1022                 mh.msg_controllen = sizeof(control);
1023
1024                 cmsg = CMSG_FIRSTHDR(&mh);
1025                 cmsg->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
1026                 cmsg->cmsg_level = IPPROTO_IPV6;
1027                 cmsg->cmsg_type = IPV6_PKTINFO;
1028
1029                 pi = (struct in6_pktinfo*) CMSG_DATA(cmsg);
1030                 pi->ipi6_ifindex = ifindex;
1031
1032                 if (source)
1033                         pi->ipi6_addr = *source;
1034         }
1035
1036         return sendmsg_loop(fd, &mh, 0);
1037 }
1038
1039 int manager_send(
1040                 Manager *m,
1041                 int fd,
1042                 int ifindex,
1043                 int family,
1044                 const union in_addr_union *destination,
1045                 uint16_t port,
1046                 const union in_addr_union *source,
1047                 DnsPacket *p) {
1048
1049         assert(m);
1050         assert(fd >= 0);
1051         assert(destination);
1052         assert(port > 0);
1053         assert(p);
1054
1055         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));
1056
1057         if (family == AF_INET)
1058                 return manager_ipv4_send(m, fd, ifindex, &destination->in, port, source ? &source->in : NULL, p);
1059         if (family == AF_INET6)
1060                 return manager_ipv6_send(m, fd, ifindex, &destination->in6, port, source ? &source->in6 : NULL, p);
1061
1062         return -EAFNOSUPPORT;
1063 }
1064
1065 uint32_t manager_find_mtu(Manager *m) {
1066         uint32_t mtu = 0;
1067         Link *l;
1068
1069         /* If we don't know on which link a DNS packet would be
1070          * delivered, let's find the largest MTU that works on all
1071          * interfaces we know of */
1072
1073         HASHMAP_FOREACH(l, m->links) {
1074                 if (l->mtu <= 0)
1075                         continue;
1076
1077                 if (mtu <= 0 || l->mtu < mtu)
1078                         mtu = l->mtu;
1079         }
1080
1081         return mtu;
1082 }
1083
1084 int manager_find_ifindex(Manager *m, int family, const union in_addr_union *in_addr) {
1085         LinkAddress *a;
1086
1087         assert(m);
1088
1089         a = manager_find_link_address(m, family, in_addr);
1090         if (a)
1091                 return a->link->ifindex;
1092
1093         return 0;
1094 }
1095
1096 void manager_refresh_rrs(Manager *m) {
1097         Link *l;
1098         DnssdService *s;
1099
1100         assert(m);
1101
1102         m->llmnr_host_ipv4_key = dns_resource_key_unref(m->llmnr_host_ipv4_key);
1103         m->llmnr_host_ipv6_key = dns_resource_key_unref(m->llmnr_host_ipv6_key);
1104         m->mdns_host_ipv4_key = dns_resource_key_unref(m->mdns_host_ipv4_key);
1105         m->mdns_host_ipv6_key = dns_resource_key_unref(m->mdns_host_ipv6_key);
1106
1107         if (m->mdns_support == RESOLVE_SUPPORT_YES)
1108                 HASHMAP_FOREACH(s, m->dnssd_services)
1109                         if (dnssd_update_rrs(s) < 0)
1110                                 log_warning("Failed to refresh DNS-SD service '%s'", s->name);
1111
1112         HASHMAP_FOREACH(l, m->links) {
1113                 link_add_rrs(l, true);
1114                 link_add_rrs(l, false);
1115         }
1116 }
1117
1118 static int manager_next_random_name(const char *old, char **ret_new) {
1119         const char *p;
1120         uint64_t u, a;
1121         char *n;
1122
1123         p = strchr(old, 0);
1124         assert(p);
1125
1126         while (p > old) {
1127                 if (!strchr(DIGITS, p[-1]))
1128                         break;
1129
1130                 p--;
1131         }
1132
1133         if (*p == 0 || safe_atou64(p, &u) < 0 || u <= 0)
1134                 u = 1;
1135
1136         /* Add a random number to the old value. This way we can avoid
1137          * that two hosts pick the same hostname, win on IPv4 and lose
1138          * on IPv6 (or vice versa), and pick the same hostname
1139          * replacement hostname, ad infinitum. We still want the
1140          * numbers to go up monotonically, hence we just add a random
1141          * value 1..10 */
1142
1143         random_bytes(&a, sizeof(a));
1144         u += 1 + a % 10;
1145
1146         if (asprintf(&n, "%.*s%" PRIu64, (int) (p - old), old, u) < 0)
1147                 return -ENOMEM;
1148
1149         *ret_new = n;
1150
1151         return 0;
1152 }
1153
1154 int manager_next_hostname(Manager *m) {
1155         _cleanup_free_ char *h = NULL, *k = NULL;
1156         int r;
1157
1158         assert(m);
1159
1160         r = manager_next_random_name(m->llmnr_hostname, &h);
1161         if (r < 0)
1162                 return r;
1163
1164         r = dns_name_concat(h, "local", 0, &k);
1165         if (r < 0)
1166                 return r;
1167
1168         log_info("Hostname conflict, changing published hostname from '%s' to '%s'.", m->llmnr_hostname, h);
1169
1170         free_and_replace(m->llmnr_hostname, h);
1171         free_and_replace(m->mdns_hostname, k);
1172
1173         manager_refresh_rrs(m);
1174         (void) manager_send_changed(m, "LLMNRHostname");
1175
1176         return 0;
1177 }
1178
1179 LinkAddress* manager_find_link_address(Manager *m, int family, const union in_addr_union *in_addr) {
1180         Link *l;
1181
1182         assert(m);
1183
1184         HASHMAP_FOREACH(l, m->links) {
1185                 LinkAddress *a;
1186
1187                 a = link_find_address(l, family, in_addr);
1188                 if (a)
1189                         return a;
1190         }
1191
1192         return NULL;
1193 }
1194
1195 bool manager_our_packet(Manager *m, DnsPacket *p) {
1196         assert(m);
1197         assert(p);
1198
1199         return !!manager_find_link_address(m, p->family, &p->sender);
1200 }
1201
1202 DnsScope* manager_find_scope(Manager *m, DnsPacket *p) {
1203         Link *l;
1204
1205         assert(m);
1206         assert(p);
1207
1208         l = hashmap_get(m->links, INT_TO_PTR(p->ifindex));
1209         if (!l)
1210                 return NULL;
1211
1212         switch (p->protocol) {
1213         case DNS_PROTOCOL_LLMNR:
1214                 if (p->family == AF_INET)
1215                         return l->llmnr_ipv4_scope;
1216                 else if (p->family == AF_INET6)
1217                         return l->llmnr_ipv6_scope;
1218
1219                 break;
1220
1221         case DNS_PROTOCOL_MDNS:
1222                 if (p->family == AF_INET)
1223                         return l->mdns_ipv4_scope;
1224                 else if (p->family == AF_INET6)
1225                         return l->mdns_ipv6_scope;
1226
1227                 break;
1228
1229         default:
1230                 break;
1231         }
1232
1233         return NULL;
1234 }
1235
1236 void manager_verify_all(Manager *m) {
1237         DnsScope *s;
1238
1239         assert(m);
1240
1241         LIST_FOREACH(scopes, s, m->dns_scopes)
1242                 dns_zone_verify_all(&s->zone);
1243 }
1244
1245 int manager_is_own_hostname(Manager *m, const char *name) {
1246         int r;
1247
1248         assert(m);
1249         assert(name);
1250
1251         if (m->llmnr_hostname) {
1252                 r = dns_name_equal(name, m->llmnr_hostname);
1253                 if (r != 0)
1254                         return r;
1255         }
1256
1257         if (m->mdns_hostname) {
1258                 r = dns_name_equal(name, m->mdns_hostname);
1259                 if (r != 0)
1260                         return r;
1261         }
1262
1263         if (m->full_hostname)
1264                 return dns_name_equal(name, m->full_hostname);
1265
1266         return 0;
1267 }
1268
1269 int manager_compile_dns_servers(Manager *m, OrderedSet **dns) {
1270         DnsServer *s;
1271         Link *l;
1272         int r;
1273
1274         assert(m);
1275         assert(dns);
1276
1277         r = ordered_set_ensure_allocated(dns, &dns_server_hash_ops);
1278         if (r < 0)
1279                 return r;
1280
1281         /* First add the system-wide servers and domains */
1282         LIST_FOREACH(servers, s, m->dns_servers) {
1283                 r = ordered_set_put(*dns, s);
1284                 if (r == -EEXIST)
1285                         continue;
1286                 if (r < 0)
1287                         return r;
1288         }
1289
1290         /* Then, add the per-link servers */
1291         HASHMAP_FOREACH(l, m->links) {
1292                 LIST_FOREACH(servers, s, l->dns_servers) {
1293                         r = ordered_set_put(*dns, s);
1294                         if (r == -EEXIST)
1295                                 continue;
1296                         if (r < 0)
1297                                 return r;
1298                 }
1299         }
1300
1301         /* If we found nothing, add the fallback servers */
1302         if (ordered_set_isempty(*dns)) {
1303                 LIST_FOREACH(servers, s, m->fallback_dns_servers) {
1304                         r = ordered_set_put(*dns, s);
1305                         if (r == -EEXIST)
1306                                 continue;
1307                         if (r < 0)
1308                                 return r;
1309                 }
1310         }
1311
1312         return 0;
1313 }
1314
1315 /* filter_route is a tri-state:
1316  *   < 0: no filtering
1317  *   = 0 or false: return only domains which should be used for searching
1318  *   > 0 or true: return only domains which are for routing only
1319  */
1320 int manager_compile_search_domains(Manager *m, OrderedSet **domains, int filter_route) {
1321         DnsSearchDomain *d;
1322         Link *l;
1323         int r;
1324
1325         assert(m);
1326         assert(domains);
1327
1328         r = ordered_set_ensure_allocated(domains, &dns_name_hash_ops);
1329         if (r < 0)
1330                 return r;
1331
1332         LIST_FOREACH(domains, d, m->search_domains) {
1333
1334                 if (filter_route >= 0 &&
1335                     d->route_only != !!filter_route)
1336                         continue;
1337
1338                 r = ordered_set_put(*domains, d->name);
1339                 if (r == -EEXIST)
1340                         continue;
1341                 if (r < 0)
1342                         return r;
1343         }
1344
1345         HASHMAP_FOREACH(l, m->links) {
1346
1347                 LIST_FOREACH(domains, d, l->search_domains) {
1348
1349                         if (filter_route >= 0 &&
1350                             d->route_only != !!filter_route)
1351                                 continue;
1352
1353                         r = ordered_set_put(*domains, d->name);
1354                         if (r == -EEXIST)
1355                                 continue;
1356                         if (r < 0)
1357                                 return r;
1358                 }
1359         }
1360
1361         return 0;
1362 }
1363
1364 DnssecMode manager_get_dnssec_mode(Manager *m) {
1365         assert(m);
1366
1367         if (m->dnssec_mode != _DNSSEC_MODE_INVALID)
1368                 return m->dnssec_mode;
1369
1370         return DNSSEC_NO;
1371 }
1372
1373 bool manager_dnssec_supported(Manager *m) {
1374         DnsServer *server;
1375         Link *l;
1376
1377         assert(m);
1378
1379         if (manager_get_dnssec_mode(m) == DNSSEC_NO)
1380                 return false;
1381
1382         server = manager_get_dns_server(m);
1383         if (server && !dns_server_dnssec_supported(server))
1384                 return false;
1385
1386         HASHMAP_FOREACH(l, m->links)
1387                 if (!link_dnssec_supported(l))
1388                         return false;
1389
1390         return true;
1391 }
1392
1393 DnsOverTlsMode manager_get_dns_over_tls_mode(Manager *m) {
1394         assert(m);
1395
1396         if (m->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
1397                 return m->dns_over_tls_mode;
1398
1399         return DNS_OVER_TLS_NO;
1400 }
1401
1402 void manager_dnssec_verdict(Manager *m, DnssecVerdict verdict, const DnsResourceKey *key) {
1403
1404         assert(verdict >= 0);
1405         assert(verdict < _DNSSEC_VERDICT_MAX);
1406
1407         if (DEBUG_LOGGING) {
1408                 char s[DNS_RESOURCE_KEY_STRING_MAX];
1409
1410                 log_debug("Found verdict for lookup %s: %s",
1411                           dns_resource_key_to_string(key, s, sizeof s),
1412                           dnssec_verdict_to_string(verdict));
1413         }
1414
1415         m->n_dnssec_verdict[verdict]++;
1416 }
1417
1418 bool manager_routable(Manager *m, int family) {
1419         Link *l;
1420
1421         assert(m);
1422
1423         /* Returns true if the host has at least one interface with a routable address of the specified type */
1424
1425         HASHMAP_FOREACH(l, m->links)
1426                 if (link_relevant(l, family, false))
1427                         return true;
1428
1429         return false;
1430 }
1431
1432 void manager_flush_caches(Manager *m) {
1433         DnsScope *scope;
1434
1435         assert(m);
1436
1437         LIST_FOREACH(scopes, scope, m->dns_scopes)
1438                 dns_cache_flush(&scope->cache);
1439
1440         log_info("Flushed all caches.");
1441 }
1442
1443 void manager_reset_server_features(Manager *m) {
1444         Link *l;
1445
1446         dns_server_reset_features_all(m->dns_servers);
1447         dns_server_reset_features_all(m->fallback_dns_servers);
1448
1449         HASHMAP_FOREACH(l, m->links)
1450                 dns_server_reset_features_all(l->dns_servers);
1451
1452         log_info("Resetting learnt feature levels on all servers.");
1453 }
1454
1455 void manager_cleanup_saved_user(Manager *m) {
1456         _cleanup_closedir_ DIR *d = NULL;
1457         struct dirent *de;
1458
1459         assert(m);
1460
1461         /* Clean up all saved per-link files in /run/systemd/resolve/netif/ that don't have a matching interface
1462          * anymore. These files are created to persist settings pushed in by the user via the bus, so that resolved can
1463          * be restarted without losing this data. */
1464
1465         d = opendir("/run/systemd/resolve/netif/");
1466         if (!d) {
1467                 if (errno == ENOENT)
1468                         return;
1469
1470                 log_warning_errno(errno, "Failed to open interface directory: %m");
1471                 return;
1472         }
1473
1474         FOREACH_DIRENT_ALL(de, d, log_error_errno(errno, "Failed to read interface directory: %m")) {
1475                 _cleanup_free_ char *p = NULL;
1476                 int ifindex;
1477                 Link *l;
1478
1479                 if (!IN_SET(de->d_type, DT_UNKNOWN, DT_REG))
1480                         continue;
1481
1482                 if (dot_or_dot_dot(de->d_name))
1483                         continue;
1484
1485                 ifindex = parse_ifindex(de->d_name);
1486                 if (ifindex < 0) /* Probably some temporary file from a previous run. Delete it */
1487                         goto rm;
1488
1489                 l = hashmap_get(m->links, INT_TO_PTR(ifindex));
1490                 if (!l) /* link vanished */
1491                         goto rm;
1492
1493                 if (l->is_managed) /* now managed by networkd, hence the bus settings are useless */
1494                         goto rm;
1495
1496                 continue;
1497
1498         rm:
1499                 p = path_join("/run/systemd/resolve/netif", de->d_name);
1500                 if (!p) {
1501                         log_oom();
1502                         return;
1503                 }
1504
1505                 (void) unlink(p);
1506         }
1507 }
1508
1509 bool manager_next_dnssd_names(Manager *m) {
1510         DnssdService *s;
1511         bool tried = false;
1512         int r;
1513
1514         assert(m);
1515
1516         HASHMAP_FOREACH(s, m->dnssd_services) {
1517                 _cleanup_free_ char * new_name = NULL;
1518
1519                 if (!s->withdrawn)
1520                         continue;
1521
1522                 r = manager_next_random_name(s->name_template, &new_name);
1523                 if (r < 0) {
1524                         log_warning_errno(r, "Failed to get new name for service '%s': %m", s->name);
1525                         continue;
1526                 }
1527
1528                 free_and_replace(s->name_template, new_name);
1529
1530                 s->withdrawn = false;
1531
1532                 tried = true;
1533         }
1534
1535         if (tried)
1536                 manager_refresh_rrs(m);
1537
1538         return tried;
1539 }