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