1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342
|
/*
* services/localzone.c - local zones authority service.
*
* Copyright (c) 2007, NLnet Labs. All rights reserved.
*
* This software is open source.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of the NLNET LABS nor the names of its contributors may
* be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/**
* \file
*
* This file contains functions to enable local zone authority service.
*/
#include "config.h"
#include "ldns/dname.h"
#include "ldns/host2wire.h"
#include "services/localzone.h"
#include "util/regional.h"
#include "util/config_file.h"
#include "util/data/dname.h"
#include "util/data/packed_rrset.h"
#include "util/data/msgencode.h"
#include "util/net_help.h"
#include "util/data/msgreply.h"
#include "util/data/msgparse.h"
struct local_zones*
local_zones_create(void)
{
struct local_zones* zones = (struct local_zones*)calloc(1,
sizeof(*zones));
if(!zones)
return NULL;
rbtree_init(&zones->ztree, &local_zone_cmp);
lock_quick_init(&zones->lock);
lock_protect(&zones->lock, &zones->ztree, sizeof(zones->ztree));
/* also lock protects the rbnode's in struct local_zone */
return zones;
}
/** helper traverse to delete zones */
static void
lzdel(rbnode_t* n, void* ATTR_UNUSED(arg))
{
struct local_zone* z = (struct local_zone*)n->key;
local_zone_delete(z);
}
void
local_zones_delete(struct local_zones* zones)
{
if(!zones)
return;
lock_quick_destroy(&zones->lock);
/* walk through zones and delete them all */
traverse_postorder(&zones->ztree, lzdel, NULL);
free(zones);
}
void
local_zone_delete(struct local_zone* z)
{
if(!z)
return;
lock_rw_destroy(&z->lock);
regional_destroy(z->region);
free(z->name);
free(z);
}
int
local_zone_cmp(const void* z1, const void* z2)
{
/* first sort on class, so that hierarchy can be maintained within
* a class */
struct local_zone* a = (struct local_zone*)z1;
struct local_zone* b = (struct local_zone*)z2;
int m;
if(a->dclass != b->dclass) {
if(a->dclass < b->dclass)
return -1;
return 1;
}
return dname_lab_cmp(a->name, a->namelabs, b->name, b->namelabs, &m);
}
int
local_data_cmp(const void* d1, const void* d2)
{
struct local_data* a = (struct local_data*)d1;
struct local_data* b = (struct local_data*)d2;
int m;
return dname_canon_lab_cmp(a->name, a->namelabs, b->name,
b->namelabs, &m);
}
/* form wireformat from text format domain name */
int
parse_dname(const char* str, uint8_t** res, size_t* len, int* labs)
{
ldns_rdf* rdf;
*res = NULL;
*len = 0;
*labs = 0;
rdf = ldns_dname_new_frm_str(str);
if(!rdf) {
log_err("cannot parse name %s", str);
return 0;
}
*res = memdup(ldns_rdf_data(rdf), ldns_rdf_size(rdf));
ldns_rdf_deep_free(rdf);
if(!*res) {
log_err("out of memory");
return 0;
}
*labs = dname_count_size_labels(*res, len);
return 1;
}
/** create a new localzone */
static struct local_zone*
local_zone_create(uint8_t* nm, size_t len, int labs,
enum localzone_type t, uint16_t dclass)
{
struct local_zone* z = (struct local_zone*)calloc(1, sizeof(*z));
if(!z) {
return NULL;
}
z->node.key = z;
z->dclass = dclass;
z->type = t;
z->name = nm;
z->namelen = len;
z->namelabs = labs;
lock_rw_init(&z->lock);
z->region = regional_create();
if(!z->region) {
free(z);
return NULL;
}
rbtree_init(&z->data, &local_data_cmp);
lock_protect(&z->lock, &z->parent, sizeof(*z)-sizeof(rbnode_t));
/* also the zones->lock protects node, parent, name*, class */
return z;
}
/** enter a new zone with allocated dname returns with WRlock */
static struct local_zone*
lz_enter_zone_dname(struct local_zones* zones, uint8_t* nm, size_t len,
int labs, enum localzone_type t, uint16_t c)
{
struct local_zone* z = local_zone_create(nm, len, labs, t, c);
if(!z) {
log_err("out of memory");
return NULL;
}
/* add to rbtree */
lock_quick_lock(&zones->lock);
lock_rw_wrlock(&z->lock);
if(!rbtree_insert(&zones->ztree, &z->node)) {
log_warn("duplicate local-zone");
lock_rw_unlock(&z->lock);
local_zone_delete(z);
lock_quick_unlock(&zones->lock);
return NULL;
}
lock_quick_unlock(&zones->lock);
return z;
}
/** enter a new zone */
static struct local_zone*
lz_enter_zone(struct local_zones* zones, const char* name, const char* type,
uint16_t dclass)
{
struct local_zone* z;
enum localzone_type t;
uint8_t* nm;
size_t len;
int labs;
if(!parse_dname(name, &nm, &len, &labs)) {
log_err("bad zone name %s %s", name, type);
return NULL;
}
if(!local_zone_str2type(type, &t)) {
log_err("bad lz_enter_zone type %s %s", name, type);
free(nm);
return NULL;
}
if(!(z=lz_enter_zone_dname(zones, nm, len, labs, t, dclass))) {
log_err("could not enter zone %s %s", name, type);
return NULL;
}
return z;
}
/** return name and class and rdata of rr; parses string */
static int
get_rr_content(const char* str, uint8_t** nm, uint16_t* type,
uint16_t* dclass, uint32_t* ttl, ldns_buffer* rdata)
{
ldns_rr* rr = NULL;
ldns_status status = ldns_rr_new_frm_str(&rr, str, 3600, NULL, NULL);
if(status != LDNS_STATUS_OK) {
log_err("error parsing local-data '%s': %s",
str, ldns_get_errorstr_by_id(status));
ldns_rr_free(rr);
return 0;
}
*nm = memdup(ldns_rdf_data(ldns_rr_owner(rr)),
ldns_rdf_size(ldns_rr_owner(rr)));
if(!*nm) {
log_err("out of memory");
ldns_rr_free(rr);
return 0;
}
*dclass = ldns_rr_get_class(rr);
*type = ldns_rr_get_type(rr);
*ttl = (uint32_t)ldns_rr_ttl(rr);
ldns_buffer_clear(rdata);
ldns_buffer_skip(rdata, 2);
status = ldns_rr_rdata2buffer_wire(rdata, rr);
ldns_rr_free(rr);
if(status != LDNS_STATUS_OK) {
log_err("error converting RR '%s' to wireformat: %s",
str, ldns_get_errorstr_by_id(status));
free(*nm);
*nm = NULL;
return 0;
}
ldns_buffer_flip(rdata);
ldns_buffer_write_u16_at(rdata, 0, ldns_buffer_limit(rdata) - 2);
return 1;
}
/** return name and class of rr; parses string */
static int
get_rr_nameclass(const char* str, uint8_t** nm, uint16_t* dclass)
{
ldns_rr* rr = NULL;
ldns_status status = ldns_rr_new_frm_str(&rr, str, 3600, NULL, NULL);
if(status != LDNS_STATUS_OK) {
log_err("error parsing local-data '%s': %s",
str, ldns_get_errorstr_by_id(status));
ldns_rr_free(rr);
return 0;
}
*nm = memdup(ldns_rdf_data(ldns_rr_owner(rr)),
ldns_rdf_size(ldns_rr_owner(rr)));
*dclass = ldns_rr_get_class(rr);
ldns_rr_free(rr);
if(!*nm) {
log_err("out of memory");
return 0;
}
return 1;
}
/**
* Find an rrset in local data structure.
* @param data: local data domain name structure.
* @param type: type to look for (host order).
* @return rrset pointer or NULL if not found.
*/
static struct local_rrset*
local_data_find_type(struct local_data* data, uint16_t type)
{
struct local_rrset* p;
type = htons(type);
for(p = data->rrsets; p; p = p->next) {
if(p->rrset->rk.type == type)
return p;
}
return NULL;
}
/** check for RR duplicates */
static int
rr_is_duplicate(struct packed_rrset_data* pd, ldns_buffer* buf)
{
size_t i;
for(i=0; i<pd->count; i++) {
if(ldns_buffer_limit(buf) == pd->rr_len[i] &&
memcmp(ldns_buffer_begin(buf), pd->rr_data[i],
ldns_buffer_limit(buf)) == 0)
return 1;
}
return 0;
}
/** new local_rrset */
static struct local_rrset*
new_local_rrset(struct regional* region, struct local_data* node,
uint16_t rrtype, uint16_t rrclass)
{
struct packed_rrset_data* pd;
struct local_rrset* rrset = (struct local_rrset*)
regional_alloc_zero(region, sizeof(*rrset));
if(!rrset) {
log_err("out of memory");
return NULL;
}
rrset->next = node->rrsets;
node->rrsets = rrset;
rrset->rrset = (struct ub_packed_rrset_key*)
regional_alloc_zero(region, sizeof(*rrset->rrset));
if(!rrset->rrset) {
log_err("out of memory");
return NULL;
}
rrset->rrset->entry.key = rrset->rrset;
pd = (struct packed_rrset_data*)regional_alloc_zero(region,
sizeof(*pd));
if(!pd) {
log_err("out of memory");
return NULL;
}
pd->trust = rrset_trust_prim_noglue;
pd->security = sec_status_insecure;
rrset->rrset->entry.data = pd;
rrset->rrset->rk.dname = node->name;
rrset->rrset->rk.dname_len = node->namelen;
rrset->rrset->rk.type = htons(rrtype);
rrset->rrset->rk.rrset_class = htons(rrclass);
return rrset;
}
/** insert RR into RRset data structure; Wastes a couple of bytes */
static int
insert_rr(struct regional* region, struct packed_rrset_data* pd,
ldns_buffer* buf, uint32_t ttl)
{
size_t* oldlen = pd->rr_len;
uint32_t* oldttl = pd->rr_ttl;
uint8_t** olddata = pd->rr_data;
/* add RR to rrset */
pd->count++;
pd->rr_len = regional_alloc(region, sizeof(*pd->rr_len)*pd->count);
pd->rr_ttl = regional_alloc(region, sizeof(*pd->rr_ttl)*pd->count);
pd->rr_data = regional_alloc(region, sizeof(*pd->rr_data)*pd->count);
if(!pd->rr_len || !pd->rr_ttl || !pd->rr_data) {
log_err("out of memory");
return 0;
}
if(pd->count > 1) {
memcpy(pd->rr_len+1, oldlen,
sizeof(*pd->rr_len)*(pd->count-1));
memcpy(pd->rr_ttl+1, oldttl,
sizeof(*pd->rr_ttl)*(pd->count-1));
memcpy(pd->rr_data+1, olddata,
sizeof(*pd->rr_data)*(pd->count-1));
}
pd->rr_len[0] = ldns_buffer_limit(buf);
pd->rr_ttl[0] = ttl;
pd->rr_data[0] = regional_alloc_init(region,
ldns_buffer_begin(buf), ldns_buffer_limit(buf));
if(!pd->rr_data[0]) {
log_err("out of memory");
return 0;
}
return 1;
}
/** find a data node by exact name */
static struct local_data*
lz_find_node(struct local_zone* z, uint8_t* nm, size_t nmlen, int nmlabs)
{
struct local_data key;
key.node.key = &key;
key.name = nm;
key.namelen = nmlen;
key.namelabs = nmlabs;
return (struct local_data*)rbtree_search(&z->data, &key.node);
}
/** find a node, create it if not and all its empty nonterminal parents */
static int
lz_find_create_node(struct local_zone* z, uint8_t* nm, size_t nmlen,
int nmlabs, struct local_data** res)
{
struct local_data* ld = lz_find_node(z, nm, nmlen, nmlabs);
if(!ld) {
/* create a domain name to store rr. */
ld = (struct local_data*)regional_alloc_zero(z->region,
sizeof(*ld));
if(!ld) {
log_err("out of memory adding local data");
return 0;
}
ld->node.key = ld;
ld->name = regional_alloc_init(z->region, nm, nmlen);
if(!ld->name) {
log_err("out of memory");
return 0;
}
ld->namelen = nmlen;
ld->namelabs = nmlabs;
if(!rbtree_insert(&z->data, &ld->node)) {
log_assert(0); /* duplicate name */
}
/* see if empty nonterminals need to be created */
if(nmlabs > z->namelabs) {
dname_remove_label(&nm, &nmlen);
if(!lz_find_create_node(z, nm, nmlen, nmlabs-1, res))
return 0;
}
}
*res = ld;
return 1;
}
/** enter data RR into auth zone */
static int
lz_enter_rr_into_zone(struct local_zone* z, ldns_buffer* buf,
const char* rrstr)
{
uint8_t* nm;
size_t nmlen;
int nmlabs;
struct local_data* node;
struct local_rrset* rrset;
struct packed_rrset_data* pd;
uint16_t rrtype, rrclass;
uint32_t ttl;
if(!get_rr_content(rrstr, &nm, &rrtype, &rrclass, &ttl, buf)) {
log_err("bad local-data: %s", rrstr);
return 0;
}
log_assert(z->dclass == rrclass);
if(z->type == local_zone_redirect &&
query_dname_compare(z->name, nm) != 0) {
log_err("local-data in redirect zone must reside at top of zone"
", not at %s", rrstr);
free(nm);
return 0;
}
nmlabs = dname_count_size_labels(nm, &nmlen);
if(!lz_find_create_node(z, nm, nmlen, nmlabs, &node)) {
free(nm);
return 0;
}
log_assert(node);
free(nm);
rrset = local_data_find_type(node, rrtype);
if(!rrset) {
rrset = new_local_rrset(z->region, node, rrtype, rrclass);
if(!rrset)
return 0;
if(query_dname_compare(node->name, z->name) == 0) {
if(rrtype == LDNS_RR_TYPE_NSEC)
rrset->rrset->rk.flags = PACKED_RRSET_NSEC_AT_APEX;
if(rrtype == LDNS_RR_TYPE_SOA)
z->soa = rrset->rrset;
}
}
pd = (struct packed_rrset_data*)rrset->rrset->entry.data;
log_assert(rrset && pd);
/* check for duplicate RR */
if(rr_is_duplicate(pd, buf)) {
verbose(VERB_ALGO, "ignoring duplicate RR: %s", rrstr);
return 1;
}
return insert_rr(z->region, pd, buf, ttl);
}
/** enter a data RR into auth data; a zone for it must exist */
static int
lz_enter_rr_str(struct local_zones* zones, const char* rr, ldns_buffer* buf)
{
uint8_t* rr_name;
uint16_t rr_class;
size_t len;
int labs;
struct local_zone* z;
int r;
if(!get_rr_nameclass(rr, &rr_name, &rr_class)) {
log_err("bad rr %s", rr);
return 0;
}
labs = dname_count_size_labels(rr_name, &len);
lock_quick_lock(&zones->lock);
z = local_zones_lookup(zones, rr_name, len, labs, rr_class);
if(!z) {
lock_quick_unlock(&zones->lock);
fatal_exit("internal error: no zone for rr %s", rr);
}
lock_rw_wrlock(&z->lock);
lock_quick_unlock(&zones->lock);
free(rr_name);
r = lz_enter_rr_into_zone(z, buf, rr);
lock_rw_unlock(&z->lock);
return r;
}
/** parse local-zone: statements */
static int
lz_enter_zones(struct local_zones* zones, struct config_file* cfg)
{
struct config_str2list* p;
struct local_zone* z;
for(p = cfg->local_zones; p; p = p->next) {
if(!(z=lz_enter_zone(zones, p->str, p->str2,
LDNS_RR_CLASS_IN)))
return 0;
lock_rw_unlock(&z->lock);
}
return 1;
}
/** lookup a zone in rbtree; exact match only; SLOW due to parse */
static int
lz_exists(struct local_zones* zones, const char* name)
{
struct local_zone z;
z.node.key = &z;
z.dclass = LDNS_RR_CLASS_IN;
if(!parse_dname(name, &z.name, &z.namelen, &z.namelabs)) {
log_err("bad name %s", name);
return 0;
}
lock_quick_lock(&zones->lock);
if(rbtree_search(&zones->ztree, &z.node)) {
lock_quick_unlock(&zones->lock);
free(z.name);
return 1;
}
lock_quick_unlock(&zones->lock);
free(z.name);
return 0;
}
/** lookup a zone in cfg->nodefault list */
static int
lz_nodefault(struct config_file* cfg, const char* name)
{
struct config_strlist* p;
size_t len = strlen(name);
if(len == 0) return 0;
if(name[len-1] == '.') len--;
for(p = cfg->local_zones_nodefault; p; p = p->next) {
/* compare zone name, lowercase, compare without ending . */
if(strncasecmp(p->str, name, len) == 0 &&
(strlen(p->str) == len || (strlen(p->str)==len+1 &&
p->str[len] == '.')))
return 1;
}
return 0;
}
/** enter AS112 default zone */
static int
add_as112_default(struct local_zones* zones, struct config_file* cfg,
ldns_buffer* buf, const char* name)
{
struct local_zone* z;
char str[1024]; /* known long enough */
if(lz_exists(zones, name) || lz_nodefault(cfg, name))
return 1; /* do not enter default content */
if(!(z=lz_enter_zone(zones, name, "static", LDNS_RR_CLASS_IN)))
return 0;
snprintf(str, sizeof(str), "%s 10800 IN SOA localhost. "
"nobody.invalid. 1 3600 1200 604800 10800", name);
if(!lz_enter_rr_into_zone(z, buf, str)) {
lock_rw_unlock(&z->lock);
return 0;
}
snprintf(str, sizeof(str), "%s 10800 IN NS localhost. ", name);
if(!lz_enter_rr_into_zone(z, buf, str)) {
lock_rw_unlock(&z->lock);
return 0;
}
lock_rw_unlock(&z->lock);
return 1;
}
/** enter default zones */
static int
lz_enter_defaults(struct local_zones* zones, struct config_file* cfg,
ldns_buffer* buf)
{
struct local_zone* z;
/* localhost. zone */
if(!lz_exists(zones, "localhost.") &&
!lz_nodefault(cfg, "localhost.")) {
if(!(z=lz_enter_zone(zones, "localhost.", "static",
LDNS_RR_CLASS_IN)) ||
!lz_enter_rr_into_zone(z, buf,
"localhost. 10800 IN NS localhost.") ||
!lz_enter_rr_into_zone(z, buf,
"localhost. 10800 IN SOA localhost. nobody.invalid. "
"1 3600 1200 604800 10800") ||
!lz_enter_rr_into_zone(z, buf,
"localhost. 10800 IN A 127.0.0.1") ||
!lz_enter_rr_into_zone(z, buf,
"localhost. 10800 IN AAAA ::1")) {
log_err("out of memory adding default zone");
if(z) { lock_rw_unlock(&z->lock); }
return 0;
}
lock_rw_unlock(&z->lock);
}
/* reverse ip4 zone */
if(!lz_exists(zones, "127.in-addr.arpa.") &&
!lz_nodefault(cfg, "127.in-addr.arpa.")) {
if(!(z=lz_enter_zone(zones, "127.in-addr.arpa.", "static",
LDNS_RR_CLASS_IN)) ||
!lz_enter_rr_into_zone(z, buf,
"127.in-addr.arpa. 10800 IN NS localhost.") ||
!lz_enter_rr_into_zone(z, buf,
"127.in-addr.arpa. 10800 IN SOA localhost. "
"nobody.invalid. 1 3600 1200 604800 10800") ||
!lz_enter_rr_into_zone(z, buf,
"1.0.0.127.in-addr.arpa. 10800 IN PTR localhost.")) {
log_err("out of memory adding default zone");
if(z) { lock_rw_unlock(&z->lock); }
return 0;
}
lock_rw_unlock(&z->lock);
}
/* reverse ip6 zone */
if(!lz_exists(zones, "1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.ip6.arpa.") &&
!lz_nodefault(cfg, "1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.ip6.arpa.")) {
if(!(z=lz_enter_zone(zones, "1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.ip6.arpa.", "static",
LDNS_RR_CLASS_IN)) ||
!lz_enter_rr_into_zone(z, buf,
"1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.ip6.arpa. 10800 IN NS localhost.") ||
!lz_enter_rr_into_zone(z, buf,
"1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.ip6.arpa. 10800 IN SOA localhost. "
"nobody.invalid. 1 3600 1200 604800 10800") ||
!lz_enter_rr_into_zone(z, buf,
"1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.ip6.arpa. 10800 IN PTR localhost.")) {
log_err("out of memory adding default zone");
if(z) { lock_rw_unlock(&z->lock); }
return 0;
}
lock_rw_unlock(&z->lock);
}
if ( !add_as112_default(zones, cfg, buf, "10.in-addr.arpa.") ||
!add_as112_default(zones, cfg, buf, "16.172.in-addr.arpa.") ||
!add_as112_default(zones, cfg, buf, "17.172.in-addr.arpa.") ||
!add_as112_default(zones, cfg, buf, "18.172.in-addr.arpa.") ||
!add_as112_default(zones, cfg, buf, "19.172.in-addr.arpa.") ||
!add_as112_default(zones, cfg, buf, "20.172.in-addr.arpa.") ||
!add_as112_default(zones, cfg, buf, "21.172.in-addr.arpa.") ||
!add_as112_default(zones, cfg, buf, "22.172.in-addr.arpa.") ||
!add_as112_default(zones, cfg, buf, "23.172.in-addr.arpa.") ||
!add_as112_default(zones, cfg, buf, "24.172.in-addr.arpa.") ||
!add_as112_default(zones, cfg, buf, "25.172.in-addr.arpa.") ||
!add_as112_default(zones, cfg, buf, "26.172.in-addr.arpa.") ||
!add_as112_default(zones, cfg, buf, "27.172.in-addr.arpa.") ||
!add_as112_default(zones, cfg, buf, "28.172.in-addr.arpa.") ||
!add_as112_default(zones, cfg, buf, "29.172.in-addr.arpa.") ||
!add_as112_default(zones, cfg, buf, "30.172.in-addr.arpa.") ||
!add_as112_default(zones, cfg, buf, "31.172.in-addr.arpa.") ||
!add_as112_default(zones, cfg, buf, "168.192.in-addr.arpa.") ||
!add_as112_default(zones, cfg, buf, "0.in-addr.arpa.") ||
!add_as112_default(zones, cfg, buf, "254.169.in-addr.arpa.") ||
!add_as112_default(zones, cfg, buf, "2.0.192.in-addr.arpa.") ||
!add_as112_default(zones, cfg, buf, "100.51.198.in-addr.arpa.") ||
!add_as112_default(zones, cfg, buf, "113.0.203.in-addr.arpa.") ||
!add_as112_default(zones, cfg, buf, "255.255.255.255.in-addr.arpa.") ||
!add_as112_default(zones, cfg, buf, "0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.ip6.arpa.") ||
!add_as112_default(zones, cfg, buf, "d.f.ip6.arpa.") ||
!add_as112_default(zones, cfg, buf, "8.e.f.ip6.arpa.") ||
!add_as112_default(zones, cfg, buf, "9.e.f.ip6.arpa.") ||
!add_as112_default(zones, cfg, buf, "a.e.f.ip6.arpa.") ||
!add_as112_default(zones, cfg, buf, "b.e.f.ip6.arpa.") ||
!add_as112_default(zones, cfg, buf, "0.1.1.0.0.2.ip6.arpa.") ||
!add_as112_default(zones, cfg, buf, "8.b.d.0.1.0.0.2.ip6.arpa.")) {
log_err("out of memory adding default zone");
return 0;
}
return 1;
}
/** setup parent pointers, so that a lookup can be done for closest match */
static void
init_parents(struct local_zones* zones)
{
struct local_zone* node, *prev = NULL, *p;
int m;
lock_quick_lock(&zones->lock);
RBTREE_FOR(node, struct local_zone*, &zones->ztree) {
lock_rw_wrlock(&node->lock);
node->parent = NULL;
if(!prev || prev->dclass != node->dclass) {
prev = node;
lock_rw_unlock(&node->lock);
continue;
}
(void)dname_lab_cmp(prev->name, prev->namelabs, node->name,
node->namelabs, &m); /* we know prev is smaller */
/* sort order like: . com. bla.com. zwb.com. net. */
/* find the previous, or parent-parent-parent */
for(p = prev; p; p = p->parent)
/* looking for name with few labels, a parent */
if(p->namelabs <= m) {
/* ==: since prev matched m, this is closest*/
/* <: prev matches more, but is not a parent,
* this one is a (grand)parent */
node->parent = p;
break;
}
prev = node;
lock_rw_unlock(&node->lock);
}
lock_quick_unlock(&zones->lock);
}
/** enter implicit transparent zone for local-data: without local-zone: */
static int
lz_setup_implicit(struct local_zones* zones, struct config_file* cfg)
{
/* walk over all items that have no parent zone and find
* the name that covers them all (could be the root) and
* add that as a transparent zone */
struct config_strlist* p;
int have_name = 0;
int have_other_classes = 0;
uint16_t dclass = 0;
uint8_t* nm = 0;
size_t nmlen = 0;
int nmlabs = 0;
int match = 0; /* number of labels match count */
init_parents(zones); /* to enable local_zones_lookup() */
for(p = cfg->local_data; p; p = p->next) {
uint8_t* rr_name;
uint16_t rr_class;
size_t len;
int labs;
if(!get_rr_nameclass(p->str, &rr_name, &rr_class)) {
log_err("Bad local-data RR %s", p->str);
return 0;
}
labs = dname_count_size_labels(rr_name, &len);
lock_quick_lock(&zones->lock);
if(!local_zones_lookup(zones, rr_name, len, labs, rr_class)) {
if(!have_name) {
dclass = rr_class;
nm = rr_name;
nmlen = len;
nmlabs = labs;
match = labs;
have_name = 1;
} else {
int m;
if(rr_class != dclass) {
/* process other classes later */
free(rr_name);
have_other_classes = 1;
lock_quick_unlock(&zones->lock);
continue;
}
/* find smallest shared topdomain */
(void)dname_lab_cmp(nm, nmlabs,
rr_name, labs, &m);
free(rr_name);
if(m < match)
match = m;
}
} else free(rr_name);
lock_quick_unlock(&zones->lock);
}
if(have_name) {
uint8_t* n2;
struct local_zone* z;
/* allocate zone of smallest shared topdomain to contain em */
n2 = nm;
dname_remove_labels(&n2, &nmlen, nmlabs - match);
n2 = memdup(n2, nmlen);
free(nm);
if(!n2) {
log_err("out of memory");
return 0;
}
log_nametypeclass(VERB_ALGO, "implicit transparent local-zone",
n2, 0, dclass);
if(!(z=lz_enter_zone_dname(zones, n2, nmlen, match,
local_zone_transparent, dclass))) {
return 0;
}
lock_rw_unlock(&z->lock);
}
if(have_other_classes) {
/* restart to setup other class */
return lz_setup_implicit(zones, cfg);
}
return 1;
}
/** enter auth data */
static int
lz_enter_data(struct local_zones* zones, struct config_file* cfg,
ldns_buffer* buf)
{
struct config_strlist* p;
for(p = cfg->local_data; p; p = p->next) {
if(!lz_enter_rr_str(zones, p->str, buf))
return 0;
}
return 1;
}
/** free memory from config */
static void
lz_freeup_cfg(struct config_file* cfg)
{
config_deldblstrlist(cfg->local_zones);
cfg->local_zones = NULL;
config_delstrlist(cfg->local_zones_nodefault);
cfg->local_zones_nodefault = NULL;
config_delstrlist(cfg->local_data);
cfg->local_data = NULL;
}
int
local_zones_apply_cfg(struct local_zones* zones, struct config_file* cfg)
{
ldns_buffer* buf = ldns_buffer_new(65535);
if(!buf) fatal_exit("cannot create temporary buffer");
/* create zones from zone statements. */
if(!lz_enter_zones(zones, cfg)) {
ldns_buffer_free(buf);
return 0;
}
/* apply default zones+content (unless disabled, or overridden) */
if(!lz_enter_defaults(zones, cfg, buf)) {
ldns_buffer_free(buf);
return 0;
}
/* create implicit transparent zone from data. */
if(!lz_setup_implicit(zones, cfg)) {
ldns_buffer_free(buf);
return 0;
}
/* setup parent ptrs for lookup during data entry */
init_parents(zones);
/* insert local data */
if(!lz_enter_data(zones, cfg, buf)) {
ldns_buffer_free(buf);
return 0;
}
/* freeup memory from cfg struct. */
lz_freeup_cfg(cfg);
ldns_buffer_free(buf);
return 1;
}
struct local_zone*
local_zones_lookup(struct local_zones* zones,
uint8_t* name, size_t len, int labs, uint16_t dclass)
{
rbnode_t* res = NULL;
struct local_zone *result;
struct local_zone key;
key.node.key = &key;
key.dclass = dclass;
key.name = name;
key.namelen = len;
key.namelabs = labs;
if(rbtree_find_less_equal(&zones->ztree, &key, &res)) {
/* exact */
return (struct local_zone*)res;
} else {
/* smaller element (or no element) */
int m;
result = (struct local_zone*)res;
if(!result || result->dclass != dclass)
return NULL;
/* count number of labels matched */
(void)dname_lab_cmp(result->name, result->namelabs, key.name,
key.namelabs, &m);
while(result) { /* go up until qname is subdomain of zone */
if(result->namelabs <= m)
break;
result = result->parent;
}
return result;
}
}
struct local_zone*
local_zones_find(struct local_zones* zones,
uint8_t* name, size_t len, int labs, uint16_t dclass)
{
struct local_zone key;
key.node.key = &key;
key.dclass = dclass;
key.name = name;
key.namelen = len;
key.namelabs = labs;
/* exact */
return (struct local_zone*)rbtree_search(&zones->ztree, &key);
}
/** print all RRsets in local zone */
static void
local_zone_out(struct local_zone* z)
{
struct local_data* d;
struct local_rrset* p;
RBTREE_FOR(d, struct local_data*, &z->data) {
for(p = d->rrsets; p; p = p->next) {
log_nametypeclass(0, "rrset", d->name,
ntohs(p->rrset->rk.type),
ntohs(p->rrset->rk.rrset_class));
}
}
}
void local_zones_print(struct local_zones* zones)
{
struct local_zone* z;
lock_quick_lock(&zones->lock);
log_info("number of auth zones %u", (unsigned)zones->ztree.count);
RBTREE_FOR(z, struct local_zone*, &zones->ztree) {
lock_rw_rdlock(&z->lock);
switch(z->type) {
case local_zone_deny:
log_nametypeclass(0, "deny zone",
z->name, 0, z->dclass);
break;
case local_zone_refuse:
log_nametypeclass(0, "refuse zone",
z->name, 0, z->dclass);
break;
case local_zone_redirect:
log_nametypeclass(0, "redirect zone",
z->name, 0, z->dclass);
break;
case local_zone_transparent:
log_nametypeclass(0, "transparent zone",
z->name, 0, z->dclass);
break;
case local_zone_static:
log_nametypeclass(0, "static zone",
z->name, 0, z->dclass);
break;
default:
log_nametypeclass(0, "badtyped zone",
z->name, 0, z->dclass);
break;
}
local_zone_out(z);
lock_rw_unlock(&z->lock);
}
lock_quick_unlock(&zones->lock);
}
/** encode answer consisting of 1 rrset */
static int
local_encode(struct query_info* qinfo, struct edns_data* edns,
ldns_buffer* buf, struct regional* temp,
struct ub_packed_rrset_key* rrset, int ansec, int rcode)
{
struct reply_info rep;
uint16_t udpsize;
/* make answer with time=0 for fixed TTL values */
memset(&rep, 0, sizeof(rep));
rep.flags = (uint16_t)((BIT_QR | BIT_AA | BIT_RA) | rcode);
rep.qdcount = 1;
if(ansec)
rep.an_numrrsets = 1;
else rep.ns_numrrsets = 1;
rep.rrset_count = 1;
rep.rrsets = &rrset;
udpsize = edns->udp_size;
edns->edns_version = EDNS_ADVERTISED_VERSION;
edns->udp_size = EDNS_ADVERTISED_SIZE;
edns->ext_rcode = 0;
edns->bits &= EDNS_DO;
if(!reply_info_answer_encode(qinfo, &rep,
*(uint16_t*)ldns_buffer_begin(buf),
ldns_buffer_read_u16_at(buf, 2),
buf, 0, 0, temp, udpsize, edns,
(int)(edns->bits&EDNS_DO), 0))
error_encode(buf, (LDNS_RCODE_SERVFAIL|BIT_AA), qinfo,
*(uint16_t*)ldns_buffer_begin(buf),
ldns_buffer_read_u16_at(buf, 2), edns);
return 1;
}
/** answer local data match */
static int
local_data_answer(struct local_zone* z, struct query_info* qinfo,
struct edns_data* edns, ldns_buffer* buf, struct regional* temp,
int labs, struct local_data** ldp)
{
struct local_data key;
struct local_data* ld;
struct local_rrset* lr;
key.node.key = &key;
key.name = qinfo->qname;
key.namelen = qinfo->qname_len;
key.namelabs = labs;
if(z->type == local_zone_redirect) {
key.name = z->name;
key.namelen = z->namelen;
key.namelabs = z->namelabs;
}
ld = (struct local_data*)rbtree_search(&z->data, &key.node);
*ldp = ld;
if(!ld) {
return 0;
}
lr = local_data_find_type(ld, qinfo->qtype);
if(!lr)
return 0;
if(z->type == local_zone_redirect) {
/* convert rrset name to query name; like a wildcard */
struct ub_packed_rrset_key r = *lr->rrset;
r.rk.dname = qinfo->qname;
r.rk.dname_len = qinfo->qname_len;
return local_encode(qinfo, edns, buf, temp, &r, 1,
LDNS_RCODE_NOERROR);
}
return local_encode(qinfo, edns, buf, temp, lr->rrset, 1,
LDNS_RCODE_NOERROR);
}
/**
* answer in case where no exact match is found
* @param z: zone for query
* @param qinfo: query
* @param edns: edns from query
* @param buf: buffer for answer.
* @param temp: temp region for encoding
* @param ld: local data, if NULL, no such name exists in localdata.
* @return 1 if a reply is to be sent, 0 if not.
*/
static int
lz_zone_answer(struct local_zone* z, struct query_info* qinfo,
struct edns_data* edns, ldns_buffer* buf, struct regional* temp,
struct local_data* ld)
{
if(z->type == local_zone_deny) {
/** no reply at all, signal caller by clearing buffer. */
ldns_buffer_clear(buf);
ldns_buffer_flip(buf);
return 1;
} else if(z->type == local_zone_refuse) {
error_encode(buf, (LDNS_RCODE_REFUSED|BIT_AA), qinfo,
*(uint16_t*)ldns_buffer_begin(buf),
ldns_buffer_read_u16_at(buf, 2), edns);
return 1;
} else if(z->type == local_zone_static ||
z->type == local_zone_redirect) {
/* for static, reply nodata or nxdomain
* for redirect, reply nodata */
/* no additional section processing,
* cname, dname or wildcard processing,
* or using closest match for NSEC.
* or using closest match for returning delegation downwards
*/
int rcode = ld?LDNS_RCODE_NOERROR:LDNS_RCODE_NXDOMAIN;
if(z->soa)
return local_encode(qinfo, edns, buf, temp,
z->soa, 0, rcode);
error_encode(buf, (rcode|BIT_AA), qinfo,
*(uint16_t*)ldns_buffer_begin(buf),
ldns_buffer_read_u16_at(buf, 2), edns);
return 1;
}
/* else z->type == local_zone_transparent */
/* if the zone is transparent and the name exists, but the type
* does not, then we should make this noerror/nodata */
if(ld && ld->rrsets) {
int rcode = LDNS_RCODE_NOERROR;
if(z->soa)
return local_encode(qinfo, edns, buf, temp,
z->soa, 0, rcode);
error_encode(buf, (rcode|BIT_AA), qinfo,
*(uint16_t*)ldns_buffer_begin(buf),
ldns_buffer_read_u16_at(buf, 2), edns);
return 1;
}
/* stop here, and resolve further on */
return 0;
}
int
local_zones_answer(struct local_zones* zones, struct query_info* qinfo,
struct edns_data* edns, ldns_buffer* buf, struct regional* temp)
{
/* see if query is covered by a zone,
* if so: - try to match (exact) local data
* - look at zone type for negative response. */
int labs = dname_count_labels(qinfo->qname);
struct local_data* ld;
struct local_zone* z;
int r;
lock_quick_lock(&zones->lock);
z = local_zones_lookup(zones, qinfo->qname,
qinfo->qname_len, labs, qinfo->qclass);
if(!z) {
lock_quick_unlock(&zones->lock);
return 0;
}
lock_rw_rdlock(&z->lock);
lock_quick_unlock(&zones->lock);
if(local_data_answer(z, qinfo, edns, buf, temp, labs, &ld)) {
lock_rw_unlock(&z->lock);
return 1;
}
r = lz_zone_answer(z, qinfo, edns, buf, temp, ld);
lock_rw_unlock(&z->lock);
return r;
}
const char* local_zone_type2str(enum localzone_type t)
{
switch(t) {
case local_zone_deny: return "deny";
case local_zone_refuse: return "refuse";
case local_zone_redirect: return "redirect";
case local_zone_transparent: return "transparent";
case local_zone_static: return "static";
case local_zone_nodefault: return "nodefault";
}
return "badtyped";
}
int local_zone_str2type(const char* type, enum localzone_type* t)
{
if(strcmp(type, "deny") == 0)
*t = local_zone_deny;
else if(strcmp(type, "refuse") == 0)
*t = local_zone_refuse;
else if(strcmp(type, "static") == 0)
*t = local_zone_static;
else if(strcmp(type, "transparent") == 0)
*t = local_zone_transparent;
else if(strcmp(type, "redirect") == 0)
*t = local_zone_redirect;
else return 0;
return 1;
}
/** iterate over the kiddies of the given name and set their parent ptr */
static void
set_kiddo_parents(struct local_zone* z, struct local_zone* match,
struct local_zone* newp)
{
/* both zones and z are locked already */
/* in the sorted rbtree, the kiddies of z are located after z */
/* z must be present in the tree */
struct local_zone* p = z;
p = (struct local_zone*)rbtree_next(&p->node);
while(p!=(struct local_zone*)RBTREE_NULL &&
p->dclass == z->dclass && dname_strict_subdomain(p->name,
p->namelabs, z->name, z->namelabs)) {
/* update parent ptr */
/* only when matches with existing parent pointer, so that
* deeper child structures are not touched, i.e.
* update of x, and a.x, b.x, f.b.x, g.b.x, c.x, y
* gets to update a.x, b.x and c.x */
lock_rw_wrlock(&p->lock);
if(p->parent == match)
p->parent = newp;
lock_rw_unlock(&p->lock);
p = (struct local_zone*)rbtree_next(&p->node);
}
}
struct local_zone* local_zones_add_zone(struct local_zones* zones,
uint8_t* name, size_t len, int labs, uint16_t dclass,
enum localzone_type tp)
{
/* create */
struct local_zone* z = local_zone_create(name, len, labs, tp, dclass);
if(!z) return NULL;
lock_rw_wrlock(&z->lock);
/* find the closest parent */
z->parent = local_zones_find(zones, name, len, labs, dclass);
/* insert into the tree */
if(!rbtree_insert(&zones->ztree, &z->node)) {
/* duplicate entry! */
lock_rw_unlock(&z->lock);
local_zone_delete(z);
log_err("internal: duplicate entry in local_zones_add_zone");
return NULL;
}
/* set parent pointers right */
set_kiddo_parents(z, z->parent, z);
lock_rw_unlock(&z->lock);
return z;
}
void local_zones_del_zone(struct local_zones* zones, struct local_zone* z)
{
/* fix up parents in tree */
lock_rw_wrlock(&z->lock);
set_kiddo_parents(z, z, z->parent);
/* remove from tree */
(void)rbtree_delete(&zones->ztree, z);
/* delete the zone */
lock_rw_unlock(&z->lock);
local_zone_delete(z);
}
int
local_zones_add_RR(struct local_zones* zones, const char* rr, ldns_buffer* buf)
{
uint8_t* rr_name;
uint16_t rr_class;
size_t len;
int labs;
struct local_zone* z;
int r;
if(!get_rr_nameclass(rr, &rr_name, &rr_class)) {
return 0;
}
labs = dname_count_size_labels(rr_name, &len);
lock_quick_lock(&zones->lock);
z = local_zones_lookup(zones, rr_name, len, labs, rr_class);
if(!z) {
z = local_zones_add_zone(zones, rr_name, len, labs, rr_class,
local_zone_transparent);
if(!z) {
lock_quick_unlock(&zones->lock);
return 0;
}
} else {
free(rr_name);
}
lock_rw_wrlock(&z->lock);
lock_quick_unlock(&zones->lock);
r = lz_enter_rr_into_zone(z, buf, rr);
lock_rw_unlock(&z->lock);
return r;
}
/** returns true if the node is terminal so no deeper domain names exist */
static int
is_terminal(struct local_data* d)
{
/* for empty nonterminals, the deeper domain names are sorted
* right after them, so simply check the next name in the tree
*/
struct local_data* n = (struct local_data*)rbtree_next(&d->node);
if(n == (struct local_data*)RBTREE_NULL)
return 1; /* last in tree, no deeper node */
if(dname_strict_subdomain(n->name, n->namelabs, d->name, d->namelabs))
return 0; /* there is a deeper node */
return 1;
}
/** delete empty terminals from tree when final data is deleted */
static void
del_empty_term(struct local_zone* z, struct local_data* d,
uint8_t* name, size_t len, int labs)
{
while(d && d->rrsets == NULL && is_terminal(d)) {
/* is this empty nonterminal? delete */
/* note, no memory recycling in zone region */
(void)rbtree_delete(&z->data, d);
/* go up and to the next label */
if(dname_is_root(name))
return;
dname_remove_label(&name, &len);
labs--;
d = lz_find_node(z, name, len, labs);
}
}
void local_zones_del_data(struct local_zones* zones,
uint8_t* name, size_t len, int labs, uint16_t dclass)
{
/* find zone */
struct local_zone* z;
struct local_data* d;
lock_quick_lock(&zones->lock);
z = local_zones_lookup(zones, name, len, labs, dclass);
if(!z) {
/* no such zone, we're done */
lock_quick_unlock(&zones->lock);
return;
}
lock_rw_wrlock(&z->lock);
lock_quick_unlock(&zones->lock);
/* find the domain */
d = lz_find_node(z, name, len, labs);
if(d) {
/* no memory recycling for zone deletions ... */
d->rrsets = NULL;
/* did we delete the soa record ? */
if(query_dname_compare(d->name, z->name) == 0)
z->soa = NULL;
/* cleanup the empty nonterminals for this name */
del_empty_term(z, d, name, len, labs);
}
lock_rw_unlock(&z->lock);
}
|