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) manager_write_resolv_conf(l->manager);
 269
 270         return sd_bus_reply_method_return(message, NULL);
 271
 272 clear:
 273         dns_server_unlink_all(l->dns_servers);
 274         return r;
 275 }
 276
 277 int bus_link_method_set_domains(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 278         Link *l = userdata;
 279         int r;
 280
 281         assert(message);
 282         assert(l);
 283
 284         r = verify_unmanaged_link(l, error);
 285         if (r < 0)
 286                 return r;
 287
 288         r = sd_bus_message_enter_container(message, 'a', "(sb)");
 289         if (r < 0)
 290                 return r;
 291
 292         for (;;) {
 293                 const char *name;
 294                 int route_only;
 295
 296                 r = sd_bus_message_read(message, "(sb)", &name, &route_only);
 297                 if (r < 0)
 298                         return r;
 299                 if (r == 0)
 300                         break;
 301
 302                 r = dns_name_is_valid(name);
 303                 if (r < 0)
 304                         return r;
 305                 if (r == 0)
 306                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid search domain %s", name);
 307                 if (!route_only && dns_name_is_root(name))
 308                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Root domain is not suitable as search domain");
 309         }
 310
 311         dns_search_domain_mark_all(l->search_domains);
 312
 313         r = sd_bus_message_rewind(message, false);
 314         if (r < 0)
 315                 return r;
 316
 317         for (;;) {
 318                 DnsSearchDomain *d;
 319                 const char *name;
 320                 int route_only;
 321
 322                 r = sd_bus_message_read(message, "(sb)", &name, &route_only);
 323                 if (r < 0)
 324                         goto clear;
 325                 if (r == 0)
 326                         break;
 327
 328                 r = dns_search_domain_find(l->search_domains, name, &d);
 329                 if (r < 0)
 330                         goto clear;
 331
 332                 if (r > 0)
 333                         dns_search_domain_move_back_and_unmark(d);
 334                 else {
 335                         r = dns_search_domain_new(l->manager, &d, DNS_SEARCH_DOMAIN_LINK, l, name);
 336                         if (r < 0)
 337                                 goto clear;
 338                 }
 339
 340                 d->route_only = route_only;
 341         }
 342
 343         r = sd_bus_message_exit_container(message);
 344         if (r < 0)
 345                 goto clear;
 346
 347         dns_search_domain_unlink_marked(l->search_domains);
 348
 349         (void) manager_write_resolv_conf(l->manager);
 350
 351         return sd_bus_reply_method_return(message, NULL);
 352
 353 clear:
 354         dns_search_domain_unlink_all(l->search_domains);
 355         return r;
 356 }
 357
 358 int bus_link_method_set_llmnr(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 359         Link *l = userdata;
 360         ResolveSupport mode;
 361         const char *llmnr;
 362         int r;
 363
 364         assert(message);
 365         assert(l);
 366
 367         r = verify_unmanaged_link(l, error);
 368         if (r < 0)
 369                 return r;
 370
 371         r = sd_bus_message_read(message, "s", &llmnr);
 372         if (r < 0)
 373                 return r;
 374
 375         if (isempty(llmnr))
 376                 mode = RESOLVE_SUPPORT_YES;
 377         else {
 378                 mode = resolve_support_from_string(llmnr);
 379                 if (mode < 0)
 380                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid LLMNR setting: %s", llmnr);
 381         }
 382
 383         l->llmnr_support = mode;
 384         link_allocate_scopes(l);
 385         link_add_rrs(l, false);
 386
 387         return sd_bus_reply_method_return(message, NULL);
 388 }
 389
 390 int bus_link_method_set_mdns(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 391         Link *l = userdata;
 392         ResolveSupport mode;
 393         const char *mdns;
 394         int r;
 395
 396         assert(message);
 397         assert(l);
 398
 399         r = verify_unmanaged_link(l, error);
 400         if (r < 0)
 401                 return r;
 402
 403         r = sd_bus_message_read(message, "s", &mdns);
 404         if (r < 0)
 405                 return r;
 406
 407         if (isempty(mdns))
 408                 mode = RESOLVE_SUPPORT_NO;
 409         else {
 410                 mode = resolve_support_from_string(mdns);
 411                 if (mode < 0)
 412                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid MulticastDNS setting: %s", mdns);
 413         }
 414
 415         l->mdns_support = mode;
 416         link_allocate_scopes(l);
 417         link_add_rrs(l, false);
 418
 419         return sd_bus_reply_method_return(message, NULL);
 420 }
 421
 422 int bus_link_method_set_dnssec(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 423         Link *l = userdata;
 424         const char *dnssec;
 425         DnssecMode mode;
 426         int r;
 427
 428         assert(message);
 429         assert(l);
 430
 431         r = verify_unmanaged_link(l, error);
 432         if (r < 0)
 433                 return r;
 434
 435         r = sd_bus_message_read(message, "s", &dnssec);
 436         if (r < 0)
 437                 return r;
 438
 439         if (isempty(dnssec))
 440                 mode = _DNSSEC_MODE_INVALID;
 441         else {
 442                 mode = dnssec_mode_from_string(dnssec);
 443                 if (mode < 0)
 444                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid DNSSEC setting: %s", dnssec);
 445         }
 446
 447         link_set_dnssec_mode(l, mode);
 448
 449         return sd_bus_reply_method_return(message, NULL);
 450 }
 451
 452 int bus_link_method_set_dnssec_negative_trust_anchors(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 453         _cleanup_set_free_free_ Set *ns = NULL;
 454         _cleanup_free_ char **ntas = NULL;
 455         Link *l = userdata;
 456         int r;
 457         char **i;
 458
 459         assert(message);
 460         assert(l);
 461
 462         r = verify_unmanaged_link(l, error);
 463         if (r < 0)
 464                 return r;
 465
 466         r = sd_bus_message_read_strv(message, &ntas);
 467         if (r < 0)
 468                 return r;
 469
 470         STRV_FOREACH(i, ntas) {
 471                 r = dns_name_is_valid(*i);
 472                 if (r < 0)
 473                         return r;
 474                 if (r == 0)
 475                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid negative trust anchor domain: %s", *i);
 476         }
 477
 478         ns = set_new(&dns_name_hash_ops);
 479         if (!ns)
 480                 return -ENOMEM;
 481
 482         STRV_FOREACH(i, ntas) {
 483                 r = set_put_strdup(ns, *i);
 484                 if (r < 0)
 485                         return r;
 486         }
 487
 488         set_free_free(l->dnssec_negative_trust_anchors);
 489         l->dnssec_negative_trust_anchors = ns;
 490         ns = NULL;
 491
 492         return sd_bus_reply_method_return(message, NULL);
 493 }
 494
 495 int bus_link_method_revert(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 496         Link *l = userdata;
 497         int r;
 498
 499         assert(message);
 500         assert(l);
 501
 502         r = verify_unmanaged_link(l, error);
 503         if (r < 0)
 504                 return r;
 505
 506         link_flush_settings(l);
 507         link_allocate_scopes(l);
 508         link_add_rrs(l, false);
 509
 510         (void) manager_write_resolv_conf(l->manager);
 511
 512         return sd_bus_reply_method_return(message, NULL);
 513 }
 514
 515 const sd_bus_vtable link_vtable[] = {
 516         SD_BUS_VTABLE_START(0),
 517
 518         SD_BUS_PROPERTY("ScopesMask", "t", property_get_scopes_mask, 0, 0),
 519         SD_BUS_PROPERTY("DNS", "a(iay)", property_get_dns, 0, 0),
 520         SD_BUS_PROPERTY("Domains", "a(sb)", property_get_domains, 0, 0),
 521         SD_BUS_PROPERTY("LLMNR", "s", property_get_resolve_support, offsetof(Link, llmnr_support), 0),
 522         SD_BUS_PROPERTY("MulticastDNS", "s", property_get_resolve_support, offsetof(Link, mdns_support), 0),
 523         SD_BUS_PROPERTY("DNSSEC", "s", property_get_dnssec_mode, 0, 0),
 524         SD_BUS_PROPERTY("DNSSECNegativeTrustAnchors", "as", property_get_ntas, 0, 0),
 525         SD_BUS_PROPERTY("DNSSECSupported", "b", property_get_dnssec_supported, 0, 0),
 526
 527         SD_BUS_METHOD("SetDNS", "a(iay)", NULL, bus_link_method_set_dns_servers, 0),
 528         SD_BUS_METHOD("SetDomains", "a(sb)", NULL, bus_link_method_set_domains, 0),
 529         SD_BUS_METHOD("SetLLMNR", "s", NULL, bus_link_method_set_llmnr, 0),
 530         SD_BUS_METHOD("SetMulticastDNS", "s", NULL, bus_link_method_set_mdns, 0),
 531         SD_BUS_METHOD("SetDNSSEC", "s", NULL, bus_link_method_set_dnssec, 0),
 532         SD_BUS_METHOD("SetDNSSECNegativeTrustAnchors", "as", NULL, bus_link_method_set_dnssec_negative_trust_anchors, 0),
 533         SD_BUS_METHOD("Revert", NULL, NULL, bus_link_method_revert, 0),
 534
 535         SD_BUS_VTABLE_END
 536 };
 537
 538 int link_object_find(sd_bus *bus, const char *path, const char *interface, void *userdata, void **found, sd_bus_error *error) {
 539         _cleanup_free_ char *e = NULL;
 540         Manager *m = userdata;
 541         int ifindex;
 542         Link *link;
 543         int r;
 544
 545         assert(bus);
 546         assert(path);
 547         assert(interface);
 548         assert(found);
 549         assert(m);
 550
 551         r = sd_bus_path_decode(path, "/org/freedesktop/resolve1/link", &e);
 552         if (r <= 0)
 553                 return 0;
 554
 555         r = parse_ifindex(e, &ifindex);
 556         if (r < 0)
 557                 return 0;
 558
 559         link = hashmap_get(m->links, INT_TO_PTR(ifindex));
 560         if (!link)
 561                 return 0;
 562
 563         *found = link;
 564         return 1;
 565 }
 566
 567 char *link_bus_path(Link *link) {
 568         _cleanup_free_ char *ifindex = NULL;
 569         char *p;
 570         int r;
 571
 572         assert(link);
 573
 574         if (asprintf(&ifindex, "%i", link->ifindex) < 0)
 575                 return NULL;
 576
 577         r = sd_bus_path_encode("/org/freedesktop/resolve1/link", ifindex, &p);
 578         if (r < 0)
 579                 return NULL;
 580
 581         return p;
 582 }
 583
 584 int link_node_enumerator(sd_bus *bus, const char *path, void *userdata, char ***nodes, sd_bus_error *error) {
 585         _cleanup_strv_free_ char **l = NULL;
 586         Manager *m = userdata;
 587         Link *link;
 588         Iterator i;
 589         unsigned c = 0;
 590
 591         assert(bus);
 592         assert(path);
 593         assert(m);
 594         assert(nodes);
 595
 596         l = new0(char*, hashmap_size(m->links) + 1);
 597         if (!l)
 598                 return -ENOMEM;
 599
 600         HASHMAP_FOREACH(link, m->links, i) {
 601                 char *p;
 602
 603                 p = link_bus_path(link);
 604                 if (!p)
 605                         return -ENOMEM;
 606
 607                 l[c++] = p;
 608         }
 609
 610         l[c] = NULL;
 611         *nodes = l;
 612         l = NULL;
 613
 614         return 1;
 615 }