src/resolve/resolved-link-bus.c

   1 /***
   2   This file is part of systemd.
   3
   4   Copyright 2016 Lennart Poettering
   5
   6   systemd is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU Lesser General Public License as published by
   8   the Free Software Foundation; either version 2.1 of the License, or
   9   (at your option) any later version.
  10
  11   systemd is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   Lesser General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  18 ***/
  19
  20 #include "alloc-util.h"
  21 #include "bus-common-errors.h"
  22 #include "bus-util.h"
  23 #include "parse-util.h"
  24 #include "resolve-util.h"
  25 #include "resolved-bus.h"
  26 #include "resolved-link-bus.h"
  27 #include "resolved-resolv-conf.h"
  28 #include "strv.h"
  29
  30 static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_resolve_support, resolve_support, ResolveSupport);
  31
  32 static int property_get_dnssec_mode(
  33                 sd_bus *bus,
  34                 const char *path,
  35                 const char *interface,
  36                 const char *property,
  37                 sd_bus_message *reply,
  38                 void *userdata,
  39                 sd_bus_error *error) {
  40
  41         Link *l = userdata;
  42
  43         assert(reply);
  44         assert(l);
  45
  46         return sd_bus_message_append(reply, "s", dnssec_mode_to_string(link_get_dnssec_mode(l)));
  47 }
  48
  49 static int property_get_dns(
  50                 sd_bus *bus,
  51                 const char *path,
  52                 const char *interface,
  53                 const char *property,
  54                 sd_bus_message *reply,
  55                 void *userdata,
  56                 sd_bus_error *error) {
  57
  58         Link *l = userdata;
  59         DnsServer *s;
  60         int r;
  61
  62         assert(reply);
  63         assert(l);
  64
  65         r = sd_bus_message_open_container(reply, 'a', "(iay)");
  66         if (r < 0)
  67                 return r;
  68
  69         LIST_FOREACH(servers, s, l->dns_servers) {
  70                 r = bus_dns_server_append(reply, s, false);
  71                 if (r < 0)
  72                         return r;
  73         }
  74
  75         return sd_bus_message_close_container(reply);
  76 }
  77
  78 static int property_get_domains(
  79                 sd_bus *bus,
  80                 const char *path,
  81                 const char *interface,
  82                 const char *property,
  83                 sd_bus_message *reply,
  84                 void *userdata,
  85                 sd_bus_error *error) {
  86
  87         Link *l = userdata;
  88         DnsSearchDomain *d;
  89         int r;
  90
  91         assert(reply);
  92         assert(l);
  93
  94         r = sd_bus_message_open_container(reply, 'a', "(sb)");
  95         if (r < 0)
  96                 return r;
  97
  98         LIST_FOREACH(domains, d, l->search_domains) {
  99                 r = sd_bus_message_append(reply, "(sb)", d->name, d->route_only);
 100                 if (r < 0)
 101                         return r;
 102         }
 103
 104         return sd_bus_message_close_container(reply);
 105 }
 106
 107 static int property_get_scopes_mask(
 108                 sd_bus *bus,
 109                 const char *path,
 110                 const char *interface,
 111                 const char *property,
 112                 sd_bus_message *reply,
 113                 void *userdata,
 114                 sd_bus_error *error) {
 115
 116         Link *l = userdata;
 117         uint64_t mask;
 118
 119         assert(reply);
 120         assert(l);
 121
 122         mask =  (l->unicast_scope ? SD_RESOLVED_DNS : 0) |
 123                 (l->llmnr_ipv4_scope ? SD_RESOLVED_LLMNR_IPV4 : 0) |
 124                 (l->llmnr_ipv6_scope ? SD_RESOLVED_LLMNR_IPV6 : 0) |
 125                 (l->mdns_ipv4_scope ? SD_RESOLVED_MDNS_IPV4 : 0) |
 126                 (l->mdns_ipv6_scope ? SD_RESOLVED_MDNS_IPV6 : 0);
 127
 128         return sd_bus_message_append(reply, "t", mask);
 129 }
 130
 131 static int property_get_ntas(
 132                 sd_bus *bus,
 133                 const char *path,
 134                 const char *interface,
 135                 const char *property,
 136                 sd_bus_message *reply,
 137                 void *userdata,
 138                 sd_bus_error *error) {
 139
 140         Link *l = userdata;
 141         const char *name;
 142         Iterator i;
 143         int r;
 144
 145         assert(reply);
 146         assert(l);
 147
 148         r = sd_bus_message_open_container(reply, 'a', "s");
 149         if (r < 0)
 150                 return r;
 151
 152         SET_FOREACH(name, l->dnssec_negative_trust_anchors, i) {
 153                 r = sd_bus_message_append(reply, "s", name);
 154                 if (r < 0)
 155                         return r;
 156         }
 157
 158         return sd_bus_message_close_container(reply);
 159 }
 160
 161 static int property_get_dnssec_supported(
 162                 sd_bus *bus,
 163                 const char *path,
 164                 const char *interface,
 165                 const char *property,
 166                 sd_bus_message *reply,
 167                 void *userdata,
 168                 sd_bus_error *error) {
 169
 170         Link *l = userdata;
 171
 172         assert(reply);
 173         assert(l);
 174
 175         return sd_bus_message_append(reply, "b", link_dnssec_supported(l));
 176 }
 177
 178 static int verify_unmanaged_link(Link *l, sd_bus_error *error) {
 179         assert(l);
 180
 181         if (l->flags & IFF_LOOPBACK)
 182                 return sd_bus_error_setf(error, BUS_ERROR_LINK_BUSY, "Link %s is loopback device.", l->name);
 183         if (l->is_managed)
 184                 return sd_bus_error_setf(error, BUS_ERROR_LINK_BUSY, "Link %s is managed.", l->name);
 185
 186         return 0;
 187 }
 188
 189 int bus_link_method_set_dns_servers(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 190         _cleanup_free_ struct in_addr_data *dns = NULL;
 191         size_t allocated = 0, n = 0;
 192         Link *l = userdata;
 193         unsigned i;
 194         int r;
 195
 196         assert(message);
 197         assert(l);
 198
 199         r = verify_unmanaged_link(l, error);
 200         if (r < 0)
 201                 return r;
 202
 203         r = sd_bus_message_enter_container(message, 'a', "(iay)");
 204         if (r < 0)
 205                 return r;
 206
 207         for (;;) {
 208                 int family;
 209                 size_t sz;
 210                 const void *d;
 211
 212                 assert_cc(sizeof(int) == sizeof(int32_t));
 213
 214                 r = sd_bus_message_enter_container(message, 'r', "iay");
 215                 if (r < 0)
 216                         return r;
 217                 if (r == 0)
 218                         break;
 219
 220                 r = sd_bus_message_read(message, "i", &family);
 221                 if (r < 0)
 222                         return r;
 223
 224                 if (!IN_SET(family, AF_INET, AF_INET6))
 225                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Unknown address family %i", family);
 226
 227                 r = sd_bus_message_read_array(message, 'y', &d, &sz);
 228                 if (r < 0)
 229                         return r;
 230                 if (sz != FAMILY_ADDRESS_SIZE(family))
 231                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid address size");
 232
 233                 r = sd_bus_message_exit_container(message);
 234                 if (r < 0)
 235                         return r;
 236
 237                 if (!GREEDY_REALLOC(dns, allocated, n+1))
 238                         return -ENOMEM;
 239
 240                 dns[n].family = family;
 241                 memcpy(&dns[n].address, d, sz);
 242                 n++;
 243         }
 244
 245         r = sd_bus_message_exit_container(message);
 246         if (r < 0)
 247                 return r;
 248
 249         dns_server_mark_all(l->dns_servers);
 250
 251         for (i = 0; i < n; i++) {
 252                 DnsServer *s;
 253
 254                 s = dns_server_find(l->dns_servers, dns[i].family, &dns[i].address, 0);
 255                 if (s)
 256                         dns_server_move_back_and_unmark(s);
 257                 else {
 258                         r = dns_server_new(l->manager, NULL, DNS_SERVER_LINK, l, dns[i].family, &dns[i].address, 0);
 259                         if (r < 0)
 260                                 goto clear;
 261                 }
 262
 263         }
 264
 265         dns_server_unlink_marked(l->dns_servers);
 266         link_allocate_scopes(l);
 267
 268         (void) link_save_user(l);
 269         (void) manager_write_resolv_conf(l->manager);
 270
 271         return sd_bus_reply_method_return(message, NULL);
 272
 273 clear:
 274         dns_server_unlink_all(l->dns_servers);
 275         return r;
 276 }
 277
 278 int bus_link_method_set_domains(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 279         Link *l = userdata;
 280         int r;
 281
 282         assert(message);
 283         assert(l);
 284
 285         r = verify_unmanaged_link(l, error);
 286         if (r < 0)
 287                 return r;
 288
 289         r = sd_bus_message_enter_container(message, 'a', "(sb)");
 290         if (r < 0)
 291                 return r;
 292
 293         for (;;) {
 294                 const char *name;
 295                 int route_only;
 296
 297                 r = sd_bus_message_read(message, "(sb)", &name, &route_only);
 298                 if (r < 0)
 299                         return r;
 300                 if (r == 0)
 301                         break;
 302
 303                 r = dns_name_is_valid(name);
 304                 if (r < 0)
 305                         return r;
 306                 if (r == 0)
 307                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid search domain %s", name);
 308                 if (!route_only && dns_name_is_root(name))
 309                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Root domain is not suitable as search domain");
 310         }
 311
 312         dns_search_domain_mark_all(l->search_domains);
 313
 314         r = sd_bus_message_rewind(message, false);
 315         if (r < 0)
 316                 return r;
 317
 318         for (;;) {
 319                 DnsSearchDomain *d;
 320                 const char *name;
 321                 int route_only;
 322
 323                 r = sd_bus_message_read(message, "(sb)", &name, &route_only);
 324                 if (r < 0)
 325                         goto clear;
 326                 if (r == 0)
 327                         break;
 328
 329                 r = dns_search_domain_find(l->search_domains, name, &d);
 330                 if (r < 0)
 331                         goto clear;
 332
 333                 if (r > 0)
 334                         dns_search_domain_move_back_and_unmark(d);
 335                 else {
 336                         r = dns_search_domain_new(l->manager, &d, DNS_SEARCH_DOMAIN_LINK, l, name);
 337                         if (r < 0)
 338                                 goto clear;
 339                 }
 340
 341                 d->route_only = route_only;
 342         }
 343
 344         r = sd_bus_message_exit_container(message);
 345         if (r < 0)
 346                 goto clear;
 347
 348         dns_search_domain_unlink_marked(l->search_domains);
 349
 350         (void) link_save_user(l);
 351         (void) manager_write_resolv_conf(l->manager);
 352
 353         return sd_bus_reply_method_return(message, NULL);
 354
 355 clear:
 356         dns_search_domain_unlink_all(l->search_domains);
 357         return r;
 358 }
 359
 360 int bus_link_method_set_llmnr(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 361         Link *l = userdata;
 362         ResolveSupport mode;
 363         const char *llmnr;
 364         int r;
 365
 366         assert(message);
 367         assert(l);
 368
 369         r = verify_unmanaged_link(l, error);
 370         if (r < 0)
 371                 return r;
 372
 373         r = sd_bus_message_read(message, "s", &llmnr);
 374         if (r < 0)
 375                 return r;
 376
 377         if (isempty(llmnr))
 378                 mode = RESOLVE_SUPPORT_YES;
 379         else {
 380                 mode = resolve_support_from_string(llmnr);
 381                 if (mode < 0)
 382                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid LLMNR setting: %s", llmnr);
 383         }
 384
 385         l->llmnr_support = mode;
 386         link_allocate_scopes(l);
 387         link_add_rrs(l, false);
 388
 389         (void) link_save_user(l);
 390
 391         return sd_bus_reply_method_return(message, NULL);
 392 }
 393
 394 int bus_link_method_set_mdns(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 395         Link *l = userdata;
 396         ResolveSupport mode;
 397         const char *mdns;
 398         int r;
 399
 400         assert(message);
 401         assert(l);
 402
 403         r = verify_unmanaged_link(l, error);
 404         if (r < 0)
 405                 return r;
 406
 407         r = sd_bus_message_read(message, "s", &mdns);
 408         if (r < 0)
 409                 return r;
 410
 411         if (isempty(mdns))
 412                 mode = RESOLVE_SUPPORT_NO;
 413         else {
 414                 mode = resolve_support_from_string(mdns);
 415                 if (mode < 0)
 416                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid MulticastDNS setting: %s", mdns);
 417         }
 418
 419         l->mdns_support = mode;
 420         link_allocate_scopes(l);
 421         link_add_rrs(l, false);
 422
 423         (void) link_save_user(l);
 424
 425         return sd_bus_reply_method_return(message, NULL);
 426 }
 427
 428 int bus_link_method_set_dnssec(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 429         Link *l = userdata;
 430         const char *dnssec;
 431         DnssecMode mode;
 432         int r;
 433
 434         assert(message);
 435         assert(l);
 436
 437         r = verify_unmanaged_link(l, error);
 438         if (r < 0)
 439                 return r;
 440
 441         r = sd_bus_message_read(message, "s", &dnssec);
 442         if (r < 0)
 443                 return r;
 444
 445         if (isempty(dnssec))
 446                 mode = _DNSSEC_MODE_INVALID;
 447         else {
 448                 mode = dnssec_mode_from_string(dnssec);
 449                 if (mode < 0)
 450                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid DNSSEC setting: %s", dnssec);
 451         }
 452
 453         link_set_dnssec_mode(l, mode);
 454
 455         (void) link_save_user(l);
 456
 457         return sd_bus_reply_method_return(message, NULL);
 458 }
 459
 460 int bus_link_method_set_dnssec_negative_trust_anchors(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 461         _cleanup_set_free_free_ Set *ns = NULL;
 462         _cleanup_free_ char **ntas = NULL;
 463         Link *l = userdata;
 464         int r;
 465         char **i;
 466
 467         assert(message);
 468         assert(l);
 469
 470         r = verify_unmanaged_link(l, error);
 471         if (r < 0)
 472                 return r;
 473
 474         r = sd_bus_message_read_strv(message, &ntas);
 475         if (r < 0)
 476                 return r;
 477
 478         STRV_FOREACH(i, ntas) {
 479                 r = dns_name_is_valid(*i);
 480                 if (r < 0)
 481                         return r;
 482                 if (r == 0)
 483                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid negative trust anchor domain: %s", *i);
 484         }
 485
 486         ns = set_new(&dns_name_hash_ops);
 487         if (!ns)
 488                 return -ENOMEM;
 489
 490         STRV_FOREACH(i, ntas) {
 491                 r = set_put_strdup(ns, *i);
 492                 if (r < 0)
 493                         return r;
 494         }
 495
 496         set_free_free(l->dnssec_negative_trust_anchors);
 497         l->dnssec_negative_trust_anchors = ns;
 498         ns = NULL;
 499
 500         (void) link_save_user(l);
 501
 502         return sd_bus_reply_method_return(message, NULL);
 503 }
 504
 505 int bus_link_method_revert(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 506         Link *l = userdata;
 507         int r;
 508
 509         assert(message);
 510         assert(l);
 511
 512         r = verify_unmanaged_link(l, error);
 513         if (r < 0)
 514                 return r;
 515
 516         link_flush_settings(l);
 517         link_allocate_scopes(l);
 518         link_add_rrs(l, false);
 519
 520         (void) link_save_user(l);
 521         (void) manager_write_resolv_conf(l->manager);
 522
 523         return sd_bus_reply_method_return(message, NULL);
 524 }
 525
 526 const sd_bus_vtable link_vtable[] = {
 527         SD_BUS_VTABLE_START(0),
 528
 529         SD_BUS_PROPERTY("ScopesMask", "t", property_get_scopes_mask, 0, 0),
 530         SD_BUS_PROPERTY("DNS", "a(iay)", property_get_dns, 0, 0),
 531         SD_BUS_PROPERTY("Domains", "a(sb)", property_get_domains, 0, 0),
 532         SD_BUS_PROPERTY("LLMNR", "s", property_get_resolve_support, offsetof(Link, llmnr_support), 0),
 533         SD_BUS_PROPERTY("MulticastDNS", "s", property_get_resolve_support, offsetof(Link, mdns_support), 0),
 534         SD_BUS_PROPERTY("DNSSEC", "s", property_get_dnssec_mode, 0, 0),
 535         SD_BUS_PROPERTY("DNSSECNegativeTrustAnchors", "as", property_get_ntas, 0, 0),
 536         SD_BUS_PROPERTY("DNSSECSupported", "b", property_get_dnssec_supported, 0, 0),
 537
 538         SD_BUS_METHOD("SetDNS", "a(iay)", NULL, bus_link_method_set_dns_servers, 0),
 539         SD_BUS_METHOD("SetDomains", "a(sb)", NULL, bus_link_method_set_domains, 0),
 540         SD_BUS_METHOD("SetLLMNR", "s", NULL, bus_link_method_set_llmnr, 0),
 541         SD_BUS_METHOD("SetMulticastDNS", "s", NULL, bus_link_method_set_mdns, 0),
 542         SD_BUS_METHOD("SetDNSSEC", "s", NULL, bus_link_method_set_dnssec, 0),
 543         SD_BUS_METHOD("SetDNSSECNegativeTrustAnchors", "as", NULL, bus_link_method_set_dnssec_negative_trust_anchors, 0),
 544         SD_BUS_METHOD("Revert", NULL, NULL, bus_link_method_revert, 0),
 545
 546         SD_BUS_VTABLE_END
 547 };
 548
 549 int link_object_find(sd_bus *bus, const char *path, const char *interface, void *userdata, void **found, sd_bus_error *error) {
 550         _cleanup_free_ char *e = NULL;
 551         Manager *m = userdata;
 552         int ifindex;
 553         Link *link;
 554         int r;
 555
 556         assert(bus);
 557         assert(path);
 558         assert(interface);
 559         assert(found);
 560         assert(m);
 561
 562         r = sd_bus_path_decode(path, "/org/freedesktop/resolve1/link", &e);
 563         if (r <= 0)
 564                 return 0;
 565
 566         r = parse_ifindex(e, &ifindex);
 567         if (r < 0)
 568                 return 0;
 569
 570         link = hashmap_get(m->links, INT_TO_PTR(ifindex));
 571         if (!link)
 572                 return 0;
 573
 574         *found = link;
 575         return 1;
 576 }
 577
 578 char *link_bus_path(Link *link) {
 579         _cleanup_free_ char *ifindex = NULL;
 580         char *p;
 581         int r;
 582
 583         assert(link);
 584
 585         if (asprintf(&ifindex, "%i", link->ifindex) < 0)
 586                 return NULL;
 587
 588         r = sd_bus_path_encode("/org/freedesktop/resolve1/link", ifindex, &p);
 589         if (r < 0)
 590                 return NULL;
 591
 592         return p;
 593 }
 594
 595 int link_node_enumerator(sd_bus *bus, const char *path, void *userdata, char ***nodes, sd_bus_error *error) {
 596         _cleanup_strv_free_ char **l = NULL;
 597         Manager *m = userdata;
 598         Link *link;
 599         Iterator i;
 600         unsigned c = 0;
 601
 602         assert(bus);
 603         assert(path);
 604         assert(m);
 605         assert(nodes);
 606
 607         l = new0(char*, hashmap_size(m->links) + 1);
 608         if (!l)
 609                 return -ENOMEM;
 610
 611         HASHMAP_FOREACH(link, m->links, i) {
 612                 char *p;
 613
 614                 p = link_bus_path(link);
 615                 if (!p)
 616                         return -ENOMEM;
 617
 618                 l[c++] = p;
 619         }
 620
 621         l[c] = NULL;
 622         *nodes = l;
 623         l = NULL;
 624
 625         return 1;
 626 }