src/resolve/resolved-manager.c

   1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
   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 #include "af-list.h"
  12 #include "alloc-util.h"
  13 #include "bus-polkit.h"
  14 #include "dirent-util.h"
  15 #include "dns-domain.h"
  16 #include "fd-util.h"
  17 #include "fileio.h"
  18 #include "hostname-util.h"
  19 #include "idn-util.h"
  20 #include "io-util.h"
  21 #include "missing_network.h"
  22 #include "netlink-util.h"
  23 #include "ordered-set.h"
  24 #include "parse-util.h"
  25 #include "random-util.h"
  26 #include "resolved-bus.h"
  27 #include "resolved-conf.h"
  28 #include "resolved-dns-stub.h"
  29 #include "resolved-dnssd.h"
  30 #include "resolved-etc-hosts.h"
  31 #include "resolved-llmnr.h"
  32 #include "resolved-manager.h"
  33 #include "resolved-mdns.h"
  34 #include "resolved-resolv-conf.h"
  35 #include "resolved-varlink.h"
  36 #include "socket-util.h"
  37 #include "string-table.h"
  38 #include "string-util.h"
  39 #include "utf8.h"
  40
  41 #define SEND_TIMEOUT_USEC (200 * USEC_PER_MSEC)
  42
  43 static int manager_process_link(sd_netlink *rtnl, sd_netlink_message *mm, void *userdata) {
  44         Manager *m = userdata;
  45         uint16_t type;
  46         Link *l;
  47         int ifindex, r;
  48
  49         assert(rtnl);
  50         assert(m);
  51         assert(mm);
  52
  53         r = sd_netlink_message_get_type(mm, &type);
  54         if (r < 0)
  55                 goto fail;
  56
  57         r = sd_rtnl_message_link_get_ifindex(mm, &ifindex);
  58         if (r < 0)
  59                 goto fail;
  60
  61         l = hashmap_get(m->links, INT_TO_PTR(ifindex));
  62
  63         switch (type) {
  64
  65         case RTM_NEWLINK:{
  66                 bool is_new = !l;
  67
  68                 if (!l) {
  69                         r = link_new(m, &l, ifindex);
  70                         if (r < 0)
  71                                 goto fail;
  72                 }
  73
  74                 r = link_process_rtnl(l, mm);
  75                 if (r < 0)
  76                         goto fail;
  77
  78                 r = link_update(l);
  79                 if (r < 0)
  80                         goto fail;
  81
  82                 if (is_new)
  83                         log_debug("Found new link %i/%s", ifindex, l->ifname);
  84
  85                 break;
  86         }
  87
  88         case RTM_DELLINK:
  89                 if (l) {
  90                         log_debug("Removing link %i/%s", l->ifindex, l->ifname);
  91                         link_remove_user(l);
  92                         link_free(l);
  93                 }
  94
  95                 break;
  96         }
  97
  98         return 0;
  99
 100 fail:
 101         log_warning_errno(r, "Failed to process RTNL link message: %m");
 102         return 0;
 103 }
 104
 105 static int manager_process_address(sd_netlink *rtnl, sd_netlink_message *mm, void *userdata) {
 106         Manager *m = userdata;
 107         union in_addr_union address;
 108         uint16_t type;
 109         int r, ifindex, family;
 110         LinkAddress *a;
 111         Link *l;
 112
 113         assert(rtnl);
 114         assert(mm);
 115         assert(m);
 116
 117         r = sd_netlink_message_get_type(mm, &type);
 118         if (r < 0)
 119                 goto fail;
 120
 121         r = sd_rtnl_message_addr_get_ifindex(mm, &ifindex);
 122         if (r < 0)
 123                 goto fail;
 124
 125         l = hashmap_get(m->links, INT_TO_PTR(ifindex));
 126         if (!l)
 127                 return 0;
 128
 129         r = sd_rtnl_message_addr_get_family(mm, &family);
 130         if (r < 0)
 131                 goto fail;
 132
 133         switch (family) {
 134
 135         case AF_INET:
 136                 r = sd_netlink_message_read_in_addr(mm, IFA_LOCAL, &address.in);
 137                 if (r < 0) {
 138                         r = sd_netlink_message_read_in_addr(mm, IFA_ADDRESS, &address.in);
 139                         if (r < 0)
 140                                 goto fail;
 141                 }
 142
 143                 break;
 144
 145         case AF_INET6:
 146                 r = sd_netlink_message_read_in6_addr(mm, IFA_LOCAL, &address.in6);
 147                 if (r < 0) {
 148                         r = sd_netlink_message_read_in6_addr(mm, IFA_ADDRESS, &address.in6);
 149                         if (r < 0)
 150                                 goto fail;
 151                 }
 152
 153                 break;
 154
 155         default:
 156                 return 0;
 157         }
 158
 159         a = link_find_address(l, family, &address);
 160
 161         switch (type) {
 162
 163         case RTM_NEWADDR:
 164
 165                 if (!a) {
 166                         r = link_address_new(l, &a, family, &address);
 167                         if (r < 0)
 168                                 return r;
 169                 }
 170
 171                 r = link_address_update_rtnl(a, mm);
 172                 if (r < 0)
 173                         return r;
 174
 175                 break;
 176
 177         case RTM_DELADDR:
 178                 link_address_free(a);
 179                 break;
 180         }
 181
 182         return 0;
 183
 184 fail:
 185         log_warning_errno(r, "Failed to process RTNL address message: %m");
 186         return 0;
 187 }
 188
 189 static int manager_rtnl_listen(Manager *m) {
 190         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL;
 191         sd_netlink_message *i;
 192         int r;
 193
 194         assert(m);
 195
 196         /* First, subscribe to interfaces coming and going */
 197         r = sd_netlink_open(&m->rtnl);
 198         if (r < 0)
 199                 return r;
 200
 201         r = sd_netlink_attach_event(m->rtnl, m->event, SD_EVENT_PRIORITY_IMPORTANT);
 202         if (r < 0)
 203                 return r;
 204
 205         r = sd_netlink_add_match(m->rtnl, NULL, RTM_NEWLINK, manager_process_link, NULL, m, "resolve-NEWLINK");
 206         if (r < 0)
 207                 return r;
 208
 209         r = sd_netlink_add_match(m->rtnl, NULL, RTM_DELLINK, manager_process_link, NULL, m, "resolve-DELLINK");
 210         if (r < 0)
 211                 return r;
 212
 213         r = sd_netlink_add_match(m->rtnl, NULL, RTM_NEWADDR, manager_process_address, NULL, m, "resolve-NEWADDR");
 214         if (r < 0)
 215                 return r;
 216
 217         r = sd_netlink_add_match(m->rtnl, NULL, RTM_DELADDR, manager_process_address, NULL, m, "resolve-DELADDR");
 218         if (r < 0)
 219                 return r;
 220
 221         /* Then, enumerate all links */
 222         r = sd_rtnl_message_new_link(m->rtnl, &req, RTM_GETLINK, 0);
 223         if (r < 0)
 224                 return r;
 225
 226         r = sd_netlink_message_request_dump(req, true);
 227         if (r < 0)
 228                 return r;
 229
 230         r = sd_netlink_call(m->rtnl, req, 0, &reply);
 231         if (r < 0)
 232                 return r;
 233
 234         for (i = reply; i; i = sd_netlink_message_next(i)) {
 235                 r = manager_process_link(m->rtnl, i, m);
 236                 if (r < 0)
 237                         return r;
 238         }
 239
 240         req = sd_netlink_message_unref(req);
 241         reply = sd_netlink_message_unref(reply);
 242
 243         /* Finally, enumerate all addresses, too */
 244         r = sd_rtnl_message_new_addr(m->rtnl, &req, RTM_GETADDR, 0, AF_UNSPEC);
 245         if (r < 0)
 246                 return r;
 247
 248         r = sd_netlink_message_request_dump(req, true);
 249         if (r < 0)
 250                 return r;
 251
 252         r = sd_netlink_call(m->rtnl, req, 0, &reply);
 253         if (r < 0)
 254                 return r;
 255
 256         for (i = reply; i; i = sd_netlink_message_next(i)) {
 257                 r = manager_process_address(m->rtnl, i, m);
 258                 if (r < 0)
 259                         return r;
 260         }
 261
 262         return r;
 263 }
 264
 265 static int on_network_event(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
 266         Manager *m = userdata;
 267         Link *l;
 268         int r;
 269
 270         assert(m);
 271
 272         sd_network_monitor_flush(m->network_monitor);
 273
 274         HASHMAP_FOREACH(l, m->links) {
 275                 r = link_update(l);
 276                 if (r < 0)
 277                         log_warning_errno(r, "Failed to update monitor information for %i: %m", l->ifindex);
 278         }
 279
 280         (void) manager_write_resolv_conf(m);
 281         (void) manager_send_changed(m, "DNS");
 282
 283         return 0;
 284 }
 285
 286 static int manager_network_monitor_listen(Manager *m) {
 287         int r, fd, events;
 288
 289         assert(m);
 290
 291         r = sd_network_monitor_new(&m->network_monitor, NULL);
 292         if (r < 0)
 293                 return r;
 294
 295         fd = sd_network_monitor_get_fd(m->network_monitor);
 296         if (fd < 0)
 297                 return fd;
 298
 299         events = sd_network_monitor_get_events(m->network_monitor);
 300         if (events < 0)
 301                 return events;
 302
 303         r = sd_event_add_io(m->event, &m->network_event_source, fd, events, &on_network_event, m);
 304         if (r < 0)
 305                 return r;
 306
 307         r = sd_event_source_set_priority(m->network_event_source, SD_EVENT_PRIORITY_IMPORTANT+5);
 308         if (r < 0)
 309                 return r;
 310
 311         (void) sd_event_source_set_description(m->network_event_source, "network-monitor");
 312
 313         return 0;
 314 }
 315
 316 static int determine_hostname(char **full_hostname, char **llmnr_hostname, char **mdns_hostname) {
 317         _cleanup_free_ char *h = NULL, *n = NULL;
 318 #if HAVE_LIBIDN2
 319         _cleanup_free_ char *utf8 = NULL;
 320 #elif HAVE_LIBIDN
 321         int k;
 322 #endif
 323         char label[DNS_LABEL_MAX];
 324         const char *p, *decoded;
 325         int r;
 326
 327         assert(full_hostname);
 328         assert(llmnr_hostname);
 329         assert(mdns_hostname);
 330
 331         /* Extract and normalize the first label of the locally configured hostname, and check it's not "localhost". */
 332
 333         r = gethostname_strict(&h);
 334         if (r < 0)
 335                 return log_debug_errno(r, "Can't determine system hostname: %m");
 336
 337         p = h;
 338         r = dns_label_unescape(&p, label, sizeof label, 0);
 339         if (r < 0)
 340                 return log_error_errno(r, "Failed to unescape hostname: %m");
 341         if (r == 0)
 342                 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
 343                                        "Couldn't find a single label in hostname.");
 344
 345 #if HAVE_LIBIDN || HAVE_LIBIDN2
 346         r = dlopen_idn();
 347         if (r < 0) {
 348                 log_debug_errno(r, "Failed to initialize IDN support, ignoring: %m");
 349                 decoded = label; /* no decoding */
 350         } else
 351 #endif
 352         {
 353 #if HAVE_LIBIDN2
 354                 r = sym_idn2_to_unicode_8z8z(label, &utf8, 0);
 355                 if (r != IDN2_OK)
 356                         return log_error_errno(SYNTHETIC_ERRNO(EUCLEAN),
 357                                                "Failed to undo IDNA: %s", sym_idn2_strerror(r));
 358                 assert(utf8_is_valid(utf8));
 359
 360                 r = strlen(utf8);
 361                 decoded = utf8;
 362 #elif HAVE_LIBIDN
 363                 k = dns_label_undo_idna(label, r, label, sizeof label);
 364                 if (k < 0)
 365                         return log_error_errno(k, "Failed to undo IDNA: %m");
 366                 if (k > 0)
 367                         r = k;
 368
 369                 if (!utf8_is_valid(label))
 370                         return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
 371                                                "System hostname is not UTF-8 clean.");
 372                 decoded = label;
 373 #else
 374                 decoded = label; /* no decoding */
 375 #endif
 376         }
 377
 378         r = dns_label_escape_new(decoded, r, &n);
 379         if (r < 0)
 380                 return log_error_errno(r, "Failed to escape hostname: %m");
 381
 382         if (is_localhost(n))
 383                 return log_debug_errno(SYNTHETIC_ERRNO(EINVAL),
 384                                        "System hostname is 'localhost', ignoring.");
 385
 386         r = dns_name_concat(n, "local", 0, mdns_hostname);
 387         if (r < 0)
 388                 return log_error_errno(r, "Failed to determine mDNS hostname: %m");
 389
 390         *llmnr_hostname = TAKE_PTR(n);
 391         *full_hostname = TAKE_PTR(h);
 392
 393         return 0;
 394 }
 395
 396 static const char *fallback_hostname(void) {
 397
 398         /* Determine the fall back hostname. For exposing this system to the outside world, we cannot have it to be
 399          * "localhost" even if that's the compiled in hostname. In this case, let's revert to "linux" instead. */
 400
 401         if (is_localhost(FALLBACK_HOSTNAME))
 402                 return "linux";
 403
 404         return FALLBACK_HOSTNAME;
 405 }
 406
 407 static int make_fallback_hostnames(char **full_hostname, char **llmnr_hostname, char **mdns_hostname) {
 408         _cleanup_free_ char *n = NULL, *m = NULL;
 409         char label[DNS_LABEL_MAX], *h;
 410         const char *p;
 411         int r;
 412
 413         assert(full_hostname);
 414         assert(llmnr_hostname);
 415         assert(mdns_hostname);
 416
 417         p = fallback_hostname();
 418         r = dns_label_unescape(&p, label, sizeof label, 0);
 419         if (r < 0)
 420                 return log_error_errno(r, "Failed to unescape fallback hostname: %m");
 421
 422         assert(r > 0); /* The fallback hostname must have at least one label */
 423
 424         r = dns_label_escape_new(label, r, &n);
 425         if (r < 0)
 426                 return log_error_errno(r, "Failed to escape fallback hostname: %m");
 427
 428         r = dns_name_concat(n, "local", 0, &m);
 429         if (r < 0)
 430                 return log_error_errno(r, "Failed to concatenate mDNS hostname: %m");
 431
 432         h = strdup(fallback_hostname());
 433         if (!h)
 434                 return log_oom();
 435
 436         *llmnr_hostname = TAKE_PTR(n);
 437         *mdns_hostname = TAKE_PTR(m);
 438
 439         *full_hostname = h;
 440
 441         return 0;
 442 }
 443
 444 static int on_hostname_change(sd_event_source *es, int fd, uint32_t revents, void *userdata) {
 445         _cleanup_free_ char *full_hostname = NULL, *llmnr_hostname = NULL, *mdns_hostname = NULL;
 446         Manager *m = userdata;
 447         bool llmnr_hostname_changed;
 448         int r;
 449
 450         assert(m);
 451
 452         r = determine_hostname(&full_hostname, &llmnr_hostname, &mdns_hostname);
 453         if (r < 0)
 454                 return 0; /* ignore invalid hostnames */
 455
 456         llmnr_hostname_changed = !streq(llmnr_hostname, m->llmnr_hostname);
 457         if (streq(full_hostname, m->full_hostname) &&
 458             !llmnr_hostname_changed &&
 459             streq(mdns_hostname, m->mdns_hostname))
 460                 return 0;
 461
 462         log_info("System hostname changed to '%s'.", full_hostname);
 463
 464         free_and_replace(m->full_hostname, full_hostname);
 465         free_and_replace(m->llmnr_hostname, llmnr_hostname);
 466         free_and_replace(m->mdns_hostname, mdns_hostname);
 467
 468         manager_refresh_rrs(m);
 469         (void) manager_send_changed(m, "LLMNRHostname");
 470
 471         return 0;
 472 }
 473
 474 static int manager_watch_hostname(Manager *m) {
 475         int r;
 476
 477         assert(m);
 478
 479         m->hostname_fd = open("/proc/sys/kernel/hostname",
 480                               O_RDONLY|O_CLOEXEC|O_NONBLOCK|O_NOCTTY);
 481         if (m->hostname_fd < 0) {
 482                 log_warning_errno(errno, "Failed to watch hostname: %m");
 483                 return 0;
 484         }
 485
 486         r = sd_event_add_io(m->event, &m->hostname_event_source, m->hostname_fd, 0, on_hostname_change, m);
 487         if (r < 0) {
 488                 if (r == -EPERM)
 489                         /* kernels prior to 3.2 don't support polling this file. Ignore the failure. */
 490                         m->hostname_fd = safe_close(m->hostname_fd);
 491                 else
 492                         return log_error_errno(r, "Failed to add hostname event source: %m");
 493         }
 494
 495         (void) sd_event_source_set_description(m->hostname_event_source, "hostname");
 496
 497         r = determine_hostname(&m->full_hostname, &m->llmnr_hostname, &m->mdns_hostname);
 498         if (r < 0) {
 499                 log_info("Defaulting to hostname '%s'.", fallback_hostname());
 500
 501                 r = make_fallback_hostnames(&m->full_hostname, &m->llmnr_hostname, &m->mdns_hostname);
 502                 if (r < 0)
 503                         return r;
 504         } else
 505                 log_info("Using system hostname '%s'.", m->full_hostname);
 506
 507         return 0;
 508 }
 509
 510 static int manager_sigusr1(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
 511         _cleanup_free_ char *buffer = NULL;
 512         _cleanup_fclose_ FILE *f = NULL;
 513         Manager *m = userdata;
 514         DnsServer *server;
 515         size_t size = 0;
 516         DnsScope *scope;
 517         Link *l;
 518
 519         assert(s);
 520         assert(si);
 521         assert(m);
 522
 523         f = open_memstream_unlocked(&buffer, &size);
 524         if (!f)
 525                 return log_oom();
 526
 527         LIST_FOREACH(scopes, scope, m->dns_scopes)
 528                 dns_scope_dump(scope, f);
 529
 530         LIST_FOREACH(servers, server, m->dns_servers)
 531                 dns_server_dump(server, f);
 532         LIST_FOREACH(servers, server, m->fallback_dns_servers)
 533                 dns_server_dump(server, f);
 534         HASHMAP_FOREACH(l, m->links)
 535                 LIST_FOREACH(servers, server, l->dns_servers)
 536                         dns_server_dump(server, f);
 537
 538         if (fflush_and_check(f) < 0)
 539                 return log_oom();
 540
 541         log_dump(LOG_INFO, buffer);
 542         return 0;
 543 }
 544
 545 static int manager_sigusr2(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
 546         Manager *m = userdata;
 547
 548         assert(s);
 549         assert(si);
 550         assert(m);
 551
 552         manager_flush_caches(m);
 553
 554         return 0;
 555 }
 556
 557 static int manager_sigrtmin1(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
 558         Manager *m = userdata;
 559
 560         assert(s);
 561         assert(si);
 562         assert(m);
 563
 564         manager_reset_server_features(m);
 565         return 0;
 566 }
 567
 568 int manager_new(Manager **ret) {
 569         _cleanup_(manager_freep) Manager *m = NULL;
 570         int r;
 571
 572         assert(ret);
 573
 574         m = new(Manager, 1);
 575         if (!m)
 576                 return -ENOMEM;
 577
 578         *m = (Manager) {
 579                 .llmnr_ipv4_udp_fd = -1,
 580                 .llmnr_ipv6_udp_fd = -1,
 581                 .llmnr_ipv4_tcp_fd = -1,
 582                 .llmnr_ipv6_tcp_fd = -1,
 583                 .mdns_ipv4_fd = -1,
 584                 .mdns_ipv6_fd = -1,
 585                 .hostname_fd = -1,
 586
 587                 .llmnr_support = DEFAULT_LLMNR_MODE,
 588                 .mdns_support = DEFAULT_MDNS_MODE,
 589                 .dnssec_mode = DEFAULT_DNSSEC_MODE,
 590                 .dns_over_tls_mode = DEFAULT_DNS_OVER_TLS_MODE,
 591                 .enable_cache = DNS_CACHE_MODE_YES,
 592                 .dns_stub_listener_mode = DNS_STUB_LISTENER_YES,
 593                 .read_resolv_conf = true,
 594                 .need_builtin_fallbacks = true,
 595                 .etc_hosts_last = USEC_INFINITY,
 596                 .etc_hosts_mtime = USEC_INFINITY,
 597                 .etc_hosts_ino = 0,
 598                 .etc_hosts_dev = 0,
 599                 .read_etc_hosts = true,
 600         };
 601
 602         r = dns_trust_anchor_load(&m->trust_anchor);
 603         if (r < 0)
 604                 return r;
 605
 606         r = manager_parse_config_file(m);
 607         if (r < 0)
 608                 log_warning_errno(r, "Failed to parse configuration file: %m");
 609
 610 #if ENABLE_DNS_OVER_TLS
 611         r = dnstls_manager_init(m);
 612         if (r < 0)
 613                 return r;
 614 #endif
 615
 616         r = sd_event_default(&m->event);
 617         if (r < 0)
 618                 return r;
 619
 620         (void) sd_event_add_signal(m->event, NULL, SIGTERM, NULL,  NULL);
 621         (void) sd_event_add_signal(m->event, NULL, SIGINT, NULL, NULL);
 622
 623         (void) sd_event_set_watchdog(m->event, true);
 624
 625         r = manager_watch_hostname(m);
 626         if (r < 0)
 627                 return r;
 628
 629         r = dnssd_load(m);
 630         if (r < 0)
 631                 log_warning_errno(r, "Failed to load DNS-SD configuration files: %m");
 632
 633         r = dns_scope_new(m, &m->unicast_scope, NULL, DNS_PROTOCOL_DNS, AF_UNSPEC);
 634         if (r < 0)
 635                 return r;
 636
 637         r = manager_network_monitor_listen(m);
 638         if (r < 0)
 639                 return r;
 640
 641         r = manager_rtnl_listen(m);
 642         if (r < 0)
 643                 return r;
 644
 645         r = manager_connect_bus(m);
 646         if (r < 0)
 647                 return r;
 648
 649         (void) sd_event_add_signal(m->event, &m->sigusr1_event_source, SIGUSR1, manager_sigusr1, m);
 650         (void) sd_event_add_signal(m->event, &m->sigusr2_event_source, SIGUSR2, manager_sigusr2, m);
 651         (void) sd_event_add_signal(m->event, &m->sigrtmin1_event_source, SIGRTMIN+1, manager_sigrtmin1, m);
 652
 653         manager_cleanup_saved_user(m);
 654
 655         *ret = TAKE_PTR(m);
 656
 657         return 0;
 658 }
 659
 660 int manager_start(Manager *m) {
 661         int r;
 662
 663         assert(m);
 664
 665         r = manager_dns_stub_start(m);
 666         if (r < 0)
 667                 return r;
 668
 669         r = manager_varlink_init(m);
 670         if (r < 0)
 671                 return r;
 672
 673         return 0;
 674 }
 675
 676 Manager *manager_free(Manager *m) {
 677         Link *l;
 678         DnssdService *s;
 679
 680         if (!m)
 681                 return NULL;
 682
 683         dns_server_unlink_all(m->dns_servers);
 684         dns_server_unlink_all(m->fallback_dns_servers);
 685         dns_search_domain_unlink_all(m->search_domains);
 686
 687         while ((l = hashmap_first(m->links)))
 688                link_free(l);
 689
 690         while (m->dns_queries)
 691                 dns_query_free(m->dns_queries);
 692
 693         dns_scope_free(m->unicast_scope);
 694
 695         /* At this point only orphaned streams should remain. All others should have been freed already by their
 696          * owners */
 697         while (m->dns_streams)
 698                 dns_stream_unref(m->dns_streams);
 699
 700 #if ENABLE_DNS_OVER_TLS
 701         dnstls_manager_free(m);
 702 #endif
 703
 704         hashmap_free(m->links);
 705         hashmap_free(m->dns_transactions);
 706
 707         sd_event_source_unref(m->network_event_source);
 708         sd_network_monitor_unref(m->network_monitor);
 709
 710         sd_netlink_unref(m->rtnl);
 711         sd_event_source_unref(m->rtnl_event_source);
 712
 713         manager_llmnr_stop(m);
 714         manager_mdns_stop(m);
 715         manager_dns_stub_stop(m);
 716         manager_varlink_done(m);
 717
 718         ordered_set_free(m->dns_extra_stub_listeners);
 719
 720         bus_verify_polkit_async_registry_free(m->polkit_registry);
 721
 722         sd_bus_flush_close_unref(m->bus);
 723
 724         sd_event_source_unref(m->sigusr1_event_source);
 725         sd_event_source_unref(m->sigusr2_event_source);
 726         sd_event_source_unref(m->sigrtmin1_event_source);
 727
 728         sd_event_unref(m->event);
 729
 730         dns_resource_key_unref(m->llmnr_host_ipv4_key);
 731         dns_resource_key_unref(m->llmnr_host_ipv6_key);
 732         dns_resource_key_unref(m->mdns_host_ipv4_key);
 733         dns_resource_key_unref(m->mdns_host_ipv6_key);
 734
 735         sd_event_source_unref(m->hostname_event_source);
 736         safe_close(m->hostname_fd);
 737
 738         free(m->full_hostname);
 739         free(m->llmnr_hostname);
 740         free(m->mdns_hostname);
 741
 742         while ((s = hashmap_first(m->dnssd_services)))
 743                dnssd_service_free(s);
 744         hashmap_free(m->dnssd_services);
 745
 746         dns_trust_anchor_flush(&m->trust_anchor);
 747         manager_etc_hosts_flush(m);
 748
 749         return mfree(m);
 750 }
 751
 752 int manager_recv(Manager *m, int fd, DnsProtocol protocol, DnsPacket **ret) {
 753         _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL;
 754         CMSG_BUFFER_TYPE(CMSG_SPACE(MAXSIZE(struct in_pktinfo, struct in6_pktinfo))
 755                          + CMSG_SPACE(int) /* ttl/hoplimit */
 756                          + EXTRA_CMSG_SPACE /* kernel appears to require extra buffer space */) control;
 757         union sockaddr_union sa;
 758         struct iovec iov;
 759         struct msghdr mh = {
 760                 .msg_name = &sa.sa,
 761                 .msg_namelen = sizeof(sa),
 762                 .msg_iov = &iov,
 763                 .msg_iovlen = 1,
 764                 .msg_control = &control,
 765                 .msg_controllen = sizeof(control),
 766         };
 767         struct cmsghdr *cmsg;
 768         ssize_t ms, l;
 769         int r;
 770
 771         assert(m);
 772         assert(fd >= 0);
 773         assert(ret);
 774
 775         ms = next_datagram_size_fd(fd);
 776         if (ms < 0)
 777                 return ms;
 778
 779         r = dns_packet_new(&p, protocol, ms, DNS_PACKET_SIZE_MAX);
 780         if (r < 0)
 781                 return r;
 782
 783         iov = IOVEC_MAKE(DNS_PACKET_DATA(p), p->allocated);
 784
 785         l = recvmsg_safe(fd, &mh, 0);
 786         if (IN_SET(l, -EAGAIN, -EINTR))
 787                 return 0;
 788         if (l <= 0)
 789                 return l;
 790
 791         assert(!(mh.msg_flags & MSG_TRUNC));
 792
 793         p->size = (size_t) l;
 794
 795         p->family = sa.sa.sa_family;
 796         p->ipproto = IPPROTO_UDP;
 797         if (p->family == AF_INET) {
 798                 p->sender.in = sa.in.sin_addr;
 799                 p->sender_port = be16toh(sa.in.sin_port);
 800         } else if (p->family == AF_INET6) {
 801                 p->sender.in6 = sa.in6.sin6_addr;
 802                 p->sender_port = be16toh(sa.in6.sin6_port);
 803                 p->ifindex = sa.in6.sin6_scope_id;
 804         } else
 805                 return -EAFNOSUPPORT;
 806
 807         CMSG_FOREACH(cmsg, &mh) {
 808
 809                 if (cmsg->cmsg_level == IPPROTO_IPV6) {
 810                         assert(p->family == AF_INET6);
 811
 812                         switch (cmsg->cmsg_type) {
 813
 814                         case IPV6_PKTINFO: {
 815                                 struct in6_pktinfo *i = (struct in6_pktinfo*) CMSG_DATA(cmsg);
 816
 817                                 if (p->ifindex <= 0)
 818                                         p->ifindex = i->ipi6_ifindex;
 819
 820                                 p->destination.in6 = i->ipi6_addr;
 821                                 break;
 822                         }
 823
 824                         case IPV6_HOPLIMIT:
 825                                 p->ttl = *(int *) CMSG_DATA(cmsg);
 826                                 break;
 827
 828                         }
 829                 } else if (cmsg->cmsg_level == IPPROTO_IP) {
 830                         assert(p->family == AF_INET);
 831
 832                         switch (cmsg->cmsg_type) {
 833
 834                         case IP_PKTINFO: {
 835                                 struct in_pktinfo *i = (struct in_pktinfo*) CMSG_DATA(cmsg);
 836
 837                                 if (p->ifindex <= 0)
 838                                         p->ifindex = i->ipi_ifindex;
 839
 840                                 p->destination.in = i->ipi_addr;
 841                                 break;
 842                         }
 843
 844                         case IP_TTL:
 845                                 p->ttl = *(int *) CMSG_DATA(cmsg);
 846                                 break;
 847                         }
 848                 }
 849         }
 850
 851         /* The Linux kernel sets the interface index to the loopback
 852          * device if the packet came from the local host since it
 853          * avoids the routing table in such a case. Let's unset the
 854          * interface index in such a case. */
 855         if (p->ifindex == LOOPBACK_IFINDEX)
 856                 p->ifindex = 0;
 857
 858         if (protocol != DNS_PROTOCOL_DNS) {
 859                 /* If we don't know the interface index still, we look for the
 860                  * first local interface with a matching address. Yuck! */
 861                 if (p->ifindex <= 0)
 862                         p->ifindex = manager_find_ifindex(m, p->family, &p->destination);
 863         }
 864
 865         *ret = TAKE_PTR(p);
 866
 867         return 1;
 868 }
 869
 870 static int sendmsg_loop(int fd, struct msghdr *mh, int flags) {
 871         int r;
 872
 873         assert(fd >= 0);
 874         assert(mh);
 875
 876         for (;;) {
 877                 if (sendmsg(fd, mh, flags) >= 0)
 878                         return 0;
 879
 880                 if (errno == EINTR)
 881                         continue;
 882
 883                 if (errno != EAGAIN)
 884                         return -errno;
 885
 886                 r = fd_wait_for_event(fd, POLLOUT, SEND_TIMEOUT_USEC);
 887                 if (r < 0)
 888                         return r;
 889                 if (r == 0)
 890                         return -ETIMEDOUT;
 891         }
 892 }
 893
 894 static int write_loop(int fd, void *message, size_t length) {
 895         int r;
 896
 897         assert(fd >= 0);
 898         assert(message);
 899
 900         for (;;) {
 901                 if (write(fd, message, length) >= 0)
 902                         return 0;
 903
 904                 if (errno == EINTR)
 905                         continue;
 906
 907                 if (errno != EAGAIN)
 908                         return -errno;
 909
 910                 r = fd_wait_for_event(fd, POLLOUT, SEND_TIMEOUT_USEC);
 911                 if (r < 0)
 912                         return r;
 913                 if (r == 0)
 914                         return -ETIMEDOUT;
 915         }
 916 }
 917
 918 int manager_write(Manager *m, int fd, DnsPacket *p) {
 919         int r;
 920
 921         log_debug("Sending %s%s packet with id %" PRIu16 " of size %zu.",
 922                   DNS_PACKET_TC(p) ? "truncated (!) " : "",
 923                   DNS_PACKET_QR(p) ? "response" : "query",
 924                   DNS_PACKET_ID(p),
 925                   p->size);
 926
 927         r = write_loop(fd, DNS_PACKET_DATA(p), p->size);
 928         if (r < 0)
 929                 return r;
 930
 931         return 0;
 932 }
 933
 934 static int manager_ipv4_send(
 935                 Manager *m,
 936                 int fd,
 937                 int ifindex,
 938                 const struct in_addr *destination,
 939                 uint16_t port,
 940                 const struct in_addr *source,
 941                 DnsPacket *p) {
 942
 943         CMSG_BUFFER_TYPE(CMSG_SPACE(sizeof(struct in_pktinfo))) control = {};
 944         union sockaddr_union sa;
 945         struct iovec iov;
 946         struct msghdr mh = {
 947                 .msg_iov = &iov,
 948                 .msg_iovlen = 1,
 949                 .msg_name = &sa.sa,
 950                 .msg_namelen = sizeof(sa.in),
 951         };
 952
 953         assert(m);
 954         assert(fd >= 0);
 955         assert(destination);
 956         assert(port > 0);
 957         assert(p);
 958
 959         iov = IOVEC_MAKE(DNS_PACKET_DATA(p), p->size);
 960
 961         sa = (union sockaddr_union) {
 962                 .in.sin_family = AF_INET,
 963                 .in.sin_addr = *destination,
 964                 .in.sin_port = htobe16(port),
 965         };
 966
 967         if (ifindex > 0) {
 968                 struct cmsghdr *cmsg;
 969                 struct in_pktinfo *pi;
 970
 971                 mh.msg_control = &control;
 972                 mh.msg_controllen = sizeof(control);
 973
 974                 cmsg = CMSG_FIRSTHDR(&mh);
 975                 cmsg->cmsg_len = CMSG_LEN(sizeof(struct in_pktinfo));
 976                 cmsg->cmsg_level = IPPROTO_IP;
 977                 cmsg->cmsg_type = IP_PKTINFO;
 978
 979                 pi = (struct in_pktinfo*) CMSG_DATA(cmsg);
 980                 pi->ipi_ifindex = ifindex;
 981
 982                 if (source)
 983                         pi->ipi_spec_dst = *source;
 984         }
 985
 986         return sendmsg_loop(fd, &mh, 0);
 987 }
 988
 989 static int manager_ipv6_send(
 990                 Manager *m,
 991                 int fd,
 992                 int ifindex,
 993                 const struct in6_addr *destination,
 994                 uint16_t port,
 995                 const struct in6_addr *source,
 996                 DnsPacket *p) {
 997
 998         CMSG_BUFFER_TYPE(CMSG_SPACE(sizeof(struct in6_pktinfo))) control = {};
 999         union sockaddr_union sa;
1000         struct iovec iov;
1001         struct msghdr mh = {
1002                 .msg_iov = &iov,
1003                 .msg_iovlen = 1,
1004                 .msg_name = &sa.sa,
1005                 .msg_namelen = sizeof(sa.in6),
1006         };
1007
1008         assert(m);
1009         assert(fd >= 0);
1010         assert(destination);
1011         assert(port > 0);
1012         assert(p);
1013
1014         iov = IOVEC_MAKE(DNS_PACKET_DATA(p), p->size);
1015
1016         sa = (union sockaddr_union) {
1017                 .in6.sin6_family = AF_INET6,
1018                 .in6.sin6_addr = *destination,
1019                 .in6.sin6_port = htobe16(port),
1020                 .in6.sin6_scope_id = ifindex,
1021         };
1022
1023         if (ifindex > 0) {
1024                 struct cmsghdr *cmsg;
1025                 struct in6_pktinfo *pi;
1026
1027                 mh.msg_control = &control;
1028                 mh.msg_controllen = sizeof(control);
1029
1030                 cmsg = CMSG_FIRSTHDR(&mh);
1031                 cmsg->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
1032                 cmsg->cmsg_level = IPPROTO_IPV6;
1033                 cmsg->cmsg_type = IPV6_PKTINFO;
1034
1035                 pi = (struct in6_pktinfo*) CMSG_DATA(cmsg);
1036                 pi->ipi6_ifindex = ifindex;
1037
1038                 if (source)
1039                         pi->ipi6_addr = *source;
1040         }
1041
1042         return sendmsg_loop(fd, &mh, 0);
1043 }
1044
1045 int manager_send(
1046                 Manager *m,
1047                 int fd,
1048                 int ifindex,
1049                 int family,
1050                 const union in_addr_union *destination,
1051                 uint16_t port,
1052                 const union in_addr_union *source,
1053                 DnsPacket *p) {
1054
1055         assert(m);
1056         assert(fd >= 0);
1057         assert(destination);
1058         assert(port > 0);
1059         assert(p);
1060
1061         log_debug("Sending %s%s packet with id %" PRIu16 " on interface %i/%s of size %zu.",
1062                   DNS_PACKET_TC(p) ? "truncated (!) " : "",
1063                   DNS_PACKET_QR(p) ? "response" : "query",
1064                   DNS_PACKET_ID(p),
1065                   ifindex, af_to_name(family),
1066                   p->size);
1067
1068         if (family == AF_INET)
1069                 return manager_ipv4_send(m, fd, ifindex, &destination->in, port, source ? &source->in : NULL, p);
1070         if (family == AF_INET6)
1071                 return manager_ipv6_send(m, fd, ifindex, &destination->in6, port, source ? &source->in6 : NULL, p);
1072
1073         return -EAFNOSUPPORT;
1074 }
1075
1076 uint32_t manager_find_mtu(Manager *m) {
1077         uint32_t mtu = 0;
1078         Link *l;
1079
1080         /* If we don't know on which link a DNS packet would be
1081          * delivered, let's find the largest MTU that works on all
1082          * interfaces we know of */
1083
1084         HASHMAP_FOREACH(l, m->links) {
1085                 if (l->mtu <= 0)
1086                         continue;
1087
1088                 if (mtu <= 0 || l->mtu < mtu)
1089                         mtu = l->mtu;
1090         }
1091
1092         return mtu;
1093 }
1094
1095 int manager_find_ifindex(Manager *m, int family, const union in_addr_union *in_addr) {
1096         LinkAddress *a;
1097
1098         assert(m);
1099
1100         a = manager_find_link_address(m, family, in_addr);
1101         if (a)
1102                 return a->link->ifindex;
1103
1104         return 0;
1105 }
1106
1107 void manager_refresh_rrs(Manager *m) {
1108         Link *l;
1109         DnssdService *s;
1110
1111         assert(m);
1112
1113         m->llmnr_host_ipv4_key = dns_resource_key_unref(m->llmnr_host_ipv4_key);
1114         m->llmnr_host_ipv6_key = dns_resource_key_unref(m->llmnr_host_ipv6_key);
1115         m->mdns_host_ipv4_key = dns_resource_key_unref(m->mdns_host_ipv4_key);
1116         m->mdns_host_ipv6_key = dns_resource_key_unref(m->mdns_host_ipv6_key);
1117
1118         if (m->mdns_support == RESOLVE_SUPPORT_YES)
1119                 HASHMAP_FOREACH(s, m->dnssd_services)
1120                         if (dnssd_update_rrs(s) < 0)
1121                                 log_warning("Failed to refresh DNS-SD service '%s'", s->name);
1122
1123         HASHMAP_FOREACH(l, m->links) {
1124                 link_add_rrs(l, true);
1125                 link_add_rrs(l, false);
1126         }
1127 }
1128
1129 static int manager_next_random_name(const char *old, char **ret_new) {
1130         const char *p;
1131         uint64_t u, a;
1132         char *n;
1133
1134         p = strchr(old, 0);
1135         assert(p);
1136
1137         while (p > old) {
1138                 if (!strchr(DIGITS, p[-1]))
1139                         break;
1140
1141                 p--;
1142         }
1143
1144         if (*p == 0 || safe_atou64(p, &u) < 0 || u <= 0)
1145                 u = 1;
1146
1147         /* Add a random number to the old value. This way we can avoid
1148          * that two hosts pick the same hostname, win on IPv4 and lose
1149          * on IPv6 (or vice versa), and pick the same hostname
1150          * replacement hostname, ad infinitum. We still want the
1151          * numbers to go up monotonically, hence we just add a random
1152          * value 1..10 */
1153
1154         random_bytes(&a, sizeof(a));
1155         u += 1 + a % 10;
1156
1157         if (asprintf(&n, "%.*s%" PRIu64, (int) (p - old), old, u) < 0)
1158                 return -ENOMEM;
1159
1160         *ret_new = n;
1161
1162         return 0;
1163 }
1164
1165 int manager_next_hostname(Manager *m) {
1166         _cleanup_free_ char *h = NULL, *k = NULL;
1167         int r;
1168
1169         assert(m);
1170
1171         r = manager_next_random_name(m->llmnr_hostname, &h);
1172         if (r < 0)
1173                 return r;
1174
1175         r = dns_name_concat(h, "local", 0, &k);
1176         if (r < 0)
1177                 return r;
1178
1179         log_info("Hostname conflict, changing published hostname from '%s' to '%s'.", m->llmnr_hostname, h);
1180
1181         free_and_replace(m->llmnr_hostname, h);
1182         free_and_replace(m->mdns_hostname, k);
1183
1184         manager_refresh_rrs(m);
1185         (void) manager_send_changed(m, "LLMNRHostname");
1186
1187         return 0;
1188 }
1189
1190 LinkAddress* manager_find_link_address(Manager *m, int family, const union in_addr_union *in_addr) {
1191         Link *l;
1192
1193         assert(m);
1194
1195         HASHMAP_FOREACH(l, m->links) {
1196                 LinkAddress *a;
1197
1198                 a = link_find_address(l, family, in_addr);
1199                 if (a)
1200                         return a;
1201         }
1202
1203         return NULL;
1204 }
1205
1206 bool manager_our_packet(Manager *m, DnsPacket *p) {
1207         assert(m);
1208         assert(p);
1209
1210         return !!manager_find_link_address(m, p->family, &p->sender);
1211 }
1212
1213 DnsScope* manager_find_scope(Manager *m, DnsPacket *p) {
1214         Link *l;
1215
1216         assert(m);
1217         assert(p);
1218
1219         l = hashmap_get(m->links, INT_TO_PTR(p->ifindex));
1220         if (!l)
1221                 return NULL;
1222
1223         switch (p->protocol) {
1224         case DNS_PROTOCOL_LLMNR:
1225                 if (p->family == AF_INET)
1226                         return l->llmnr_ipv4_scope;
1227                 else if (p->family == AF_INET6)
1228                         return l->llmnr_ipv6_scope;
1229
1230                 break;
1231
1232         case DNS_PROTOCOL_MDNS:
1233                 if (p->family == AF_INET)
1234                         return l->mdns_ipv4_scope;
1235                 else if (p->family == AF_INET6)
1236                         return l->mdns_ipv6_scope;
1237
1238                 break;
1239
1240         default:
1241                 break;
1242         }
1243
1244         return NULL;
1245 }
1246
1247 void manager_verify_all(Manager *m) {
1248         DnsScope *s;
1249
1250         assert(m);
1251
1252         LIST_FOREACH(scopes, s, m->dns_scopes)
1253                 dns_zone_verify_all(&s->zone);
1254 }
1255
1256 int manager_is_own_hostname(Manager *m, const char *name) {
1257         int r;
1258
1259         assert(m);
1260         assert(name);
1261
1262         if (m->llmnr_hostname) {
1263                 r = dns_name_equal(name, m->llmnr_hostname);
1264                 if (r != 0)
1265                         return r;
1266         }
1267
1268         if (m->mdns_hostname) {
1269                 r = dns_name_equal(name, m->mdns_hostname);
1270                 if (r != 0)
1271                         return r;
1272         }
1273
1274         if (m->full_hostname)
1275                 return dns_name_equal(name, m->full_hostname);
1276
1277         return 0;
1278 }
1279
1280 int manager_compile_dns_servers(Manager *m, OrderedSet **dns) {
1281         DnsServer *s;
1282         Link *l;
1283         int r;
1284
1285         assert(m);
1286         assert(dns);
1287
1288         r = ordered_set_ensure_allocated(dns, &dns_server_hash_ops);
1289         if (r < 0)
1290                 return r;
1291
1292         /* First add the system-wide servers and domains */
1293         LIST_FOREACH(servers, s, m->dns_servers) {
1294                 r = ordered_set_put(*dns, s);
1295                 if (r == -EEXIST)
1296                         continue;
1297                 if (r < 0)
1298                         return r;
1299         }
1300
1301         /* Then, add the per-link servers */
1302         HASHMAP_FOREACH(l, m->links) {
1303                 LIST_FOREACH(servers, s, l->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         /* If we found nothing, add the fallback servers */
1313         if (ordered_set_isempty(*dns)) {
1314                 LIST_FOREACH(servers, s, m->fallback_dns_servers) {
1315                         r = ordered_set_put(*dns, s);
1316                         if (r == -EEXIST)
1317                                 continue;
1318                         if (r < 0)
1319                                 return r;
1320                 }
1321         }
1322
1323         return 0;
1324 }
1325
1326 /* filter_route is a tri-state:
1327  *   < 0: no filtering
1328  *   = 0 or false: return only domains which should be used for searching
1329  *   > 0 or true: return only domains which are for routing only
1330  */
1331 int manager_compile_search_domains(Manager *m, OrderedSet **domains, int filter_route) {
1332         DnsSearchDomain *d;
1333         Link *l;
1334         int r;
1335
1336         assert(m);
1337         assert(domains);
1338
1339         r = ordered_set_ensure_allocated(domains, &dns_name_hash_ops);
1340         if (r < 0)
1341                 return r;
1342
1343         LIST_FOREACH(domains, d, m->search_domains) {
1344
1345                 if (filter_route >= 0 &&
1346                     d->route_only != !!filter_route)
1347                         continue;
1348
1349                 r = ordered_set_put(*domains, d->name);
1350                 if (r == -EEXIST)
1351                         continue;
1352                 if (r < 0)
1353                         return r;
1354         }
1355
1356         HASHMAP_FOREACH(l, m->links) {
1357
1358                 LIST_FOREACH(domains, d, l->search_domains) {
1359
1360                         if (filter_route >= 0 &&
1361                             d->route_only != !!filter_route)
1362                                 continue;
1363
1364                         r = ordered_set_put(*domains, d->name);
1365                         if (r == -EEXIST)
1366                                 continue;
1367                         if (r < 0)
1368                                 return r;
1369                 }
1370         }
1371
1372         return 0;
1373 }
1374
1375 DnssecMode manager_get_dnssec_mode(Manager *m) {
1376         assert(m);
1377
1378         if (m->dnssec_mode != _DNSSEC_MODE_INVALID)
1379                 return m->dnssec_mode;
1380
1381         return DNSSEC_NO;
1382 }
1383
1384 bool manager_dnssec_supported(Manager *m) {
1385         DnsServer *server;
1386         Link *l;
1387
1388         assert(m);
1389
1390         if (manager_get_dnssec_mode(m) == DNSSEC_NO)
1391                 return false;
1392
1393         server = manager_get_dns_server(m);
1394         if (server && !dns_server_dnssec_supported(server))
1395                 return false;
1396
1397         HASHMAP_FOREACH(l, m->links)
1398                 if (!link_dnssec_supported(l))
1399                         return false;
1400
1401         return true;
1402 }
1403
1404 DnsOverTlsMode manager_get_dns_over_tls_mode(Manager *m) {
1405         assert(m);
1406
1407         if (m->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
1408                 return m->dns_over_tls_mode;
1409
1410         return DNS_OVER_TLS_NO;
1411 }
1412
1413 void manager_dnssec_verdict(Manager *m, DnssecVerdict verdict, const DnsResourceKey *key) {
1414
1415         assert(verdict >= 0);
1416         assert(verdict < _DNSSEC_VERDICT_MAX);
1417
1418         if (DEBUG_LOGGING) {
1419                 char s[DNS_RESOURCE_KEY_STRING_MAX];
1420
1421                 log_debug("Found verdict for lookup %s: %s",
1422                           dns_resource_key_to_string(key, s, sizeof s),
1423                           dnssec_verdict_to_string(verdict));
1424         }
1425
1426         m->n_dnssec_verdict[verdict]++;
1427 }
1428
1429 bool manager_routable(Manager *m) {
1430         Link *l;
1431
1432         assert(m);
1433
1434         /* Returns true if the host has at least one interface with a routable address (regardless if IPv4 or IPv6) */
1435
1436         HASHMAP_FOREACH(l, m->links)
1437                 if (link_relevant(l, AF_UNSPEC, false))
1438                         return true;
1439
1440         return false;
1441 }
1442
1443 void manager_flush_caches(Manager *m) {
1444         DnsScope *scope;
1445
1446         assert(m);
1447
1448         LIST_FOREACH(scopes, scope, m->dns_scopes)
1449                 dns_cache_flush(&scope->cache);
1450
1451         log_info("Flushed all caches.");
1452 }
1453
1454 void manager_reset_server_features(Manager *m) {
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)
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         DnssdService *s;
1522         bool tried = false;
1523         int r;
1524
1525         assert(m);
1526
1527         HASHMAP_FOREACH(s, m->dnssd_services) {
1528                 _cleanup_free_ char * new_name = NULL;
1529
1530                 if (!s->withdrawn)
1531                         continue;
1532
1533                 r = manager_next_random_name(s->name_template, &new_name);
1534                 if (r < 0) {
1535                         log_warning_errno(r, "Failed to get new name for service '%s': %m", s->name);
1536                         continue;
1537                 }
1538
1539                 free_and_replace(s->name_template, new_name);
1540
1541                 s->withdrawn = false;
1542
1543                 tried = true;
1544         }
1545
1546         if (tried)
1547                 manager_refresh_rrs(m);
1548
1549         return tried;
1550 }