2 * services/localzone.c - local zones authority service.
4 * Copyright (c) 2007, NLnet Labs. All rights reserved.
6 * This software is open source.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * Redistributions of source code must retain the above copyright notice,
13 * this list of conditions and the following disclaimer.
15 * Redistributions in binary form must reproduce the above copyright notice,
16 * this list of conditions and the following disclaimer in the documentation
17 * and/or other materials provided with the distribution.
19 * Neither the name of the NLNET LABS nor the names of its contributors may
20 * be used to endorse or promote products derived from this software without
21 * specific prior written permission.
23 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
24 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
25 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
26 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
27 * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
28 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
29 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
30 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
39 * This file contains functions to enable local zone authority service.
42 #include "services/localzone.h"
43 #include "ldns/str2wire.h"
44 #include "ldns/sbuffer.h"
45 #include "util/regional.h"
46 #include "util/config_file.h"
47 #include "util/data/dname.h"
48 #include "util/data/packed_rrset.h"
49 #include "util/data/msgencode.h"
50 #include "util/net_help.h"
51 #include "util/data/msgreply.h"
52 #include "util/data/msgparse.h"
55 local_zones_create(void)
57 struct local_zones* zones = (struct local_zones*)calloc(1,
61 rbtree_init(&zones->ztree, &local_zone_cmp);
62 lock_rw_init(&zones->lock);
63 lock_protect(&zones->lock, &zones->ztree, sizeof(zones->ztree));
64 /* also lock protects the rbnode's in struct local_zone */
68 /** helper traverse to delete zones */
70 lzdel(rbnode_t* n, void* ATTR_UNUSED(arg))
72 struct local_zone* z = (struct local_zone*)n->key;
77 local_zones_delete(struct local_zones* zones)
81 lock_rw_destroy(&zones->lock);
82 /* walk through zones and delete them all */
83 traverse_postorder(&zones->ztree, lzdel, NULL);
88 local_zone_delete(struct local_zone* z)
92 lock_rw_destroy(&z->lock);
93 regional_destroy(z->region);
99 local_zone_cmp(const void* z1, const void* z2)
101 /* first sort on class, so that hierarchy can be maintained within
103 struct local_zone* a = (struct local_zone*)z1;
104 struct local_zone* b = (struct local_zone*)z2;
106 if(a->dclass != b->dclass) {
107 if(a->dclass < b->dclass)
111 return dname_lab_cmp(a->name, a->namelabs, b->name, b->namelabs, &m);
115 local_data_cmp(const void* d1, const void* d2)
117 struct local_data* a = (struct local_data*)d1;
118 struct local_data* b = (struct local_data*)d2;
120 return dname_canon_lab_cmp(a->name, a->namelabs, b->name,
124 /* form wireformat from text format domain name */
126 parse_dname(const char* str, uint8_t** res, size_t* len, int* labs)
128 *res = sldns_str2wire_dname(str, len);
131 log_err("cannot parse name %s", str);
134 *labs = dname_count_size_labels(*res, len);
138 /** create a new localzone */
139 static struct local_zone*
140 local_zone_create(uint8_t* nm, size_t len, int labs,
141 enum localzone_type t, uint16_t dclass)
143 struct local_zone* z = (struct local_zone*)calloc(1, sizeof(*z));
153 lock_rw_init(&z->lock);
154 z->region = regional_create();
159 rbtree_init(&z->data, &local_data_cmp);
160 lock_protect(&z->lock, &z->parent, sizeof(*z)-sizeof(rbnode_t));
161 /* also the zones->lock protects node, parent, name*, class */
165 /** enter a new zone with allocated dname returns with WRlock */
166 static struct local_zone*
167 lz_enter_zone_dname(struct local_zones* zones, uint8_t* nm, size_t len,
168 int labs, enum localzone_type t, uint16_t c)
170 struct local_zone* z = local_zone_create(nm, len, labs, t, c);
172 log_err("out of memory");
177 lock_rw_wrlock(&zones->lock);
178 lock_rw_wrlock(&z->lock);
179 if(!rbtree_insert(&zones->ztree, &z->node)) {
180 log_warn("duplicate local-zone");
181 lock_rw_unlock(&z->lock);
182 local_zone_delete(z);
183 lock_rw_unlock(&zones->lock);
186 lock_rw_unlock(&zones->lock);
190 /** enter a new zone */
191 static struct local_zone*
192 lz_enter_zone(struct local_zones* zones, const char* name, const char* type,
195 struct local_zone* z;
196 enum localzone_type t;
200 if(!parse_dname(name, &nm, &len, &labs)) {
201 log_err("bad zone name %s %s", name, type);
204 if(!local_zone_str2type(type, &t)) {
205 log_err("bad lz_enter_zone type %s %s", name, type);
209 if(!(z=lz_enter_zone_dname(zones, nm, len, labs, t, dclass))) {
210 log_err("could not enter zone %s %s", name, type);
216 /** return name and class and rdata of rr; parses string */
218 get_rr_content(const char* str, uint8_t** nm, uint16_t* type,
219 uint16_t* dclass, time_t* ttl, uint8_t* rr, size_t len,
220 uint8_t** rdata, size_t* rdata_len)
222 size_t dname_len = 0;
223 int e = sldns_str2wire_rr_buf(str, rr, &len, &dname_len, 3600,
226 log_err("error parsing local-data at %d: '%s': %s",
227 LDNS_WIREPARSE_OFFSET(e), str,
228 sldns_get_errorstr_parse(e));
231 *nm = memdup(rr, dname_len);
233 log_err("out of memory");
236 *dclass = sldns_wirerr_get_class(rr, len, dname_len);
237 *type = sldns_wirerr_get_type(rr, len, dname_len);
238 *ttl = (time_t)sldns_wirerr_get_ttl(rr, len, dname_len);
239 *rdata = sldns_wirerr_get_rdatawl(rr, len, dname_len);
240 *rdata_len = sldns_wirerr_get_rdatalen(rr, len, dname_len)+2;
244 /** return name and class of rr; parses string */
246 get_rr_nameclass(const char* str, uint8_t** nm, uint16_t* dclass)
248 uint8_t rr[LDNS_RR_BUF_SIZE];
249 size_t len = sizeof(rr), dname_len = 0;
250 int s = sldns_str2wire_rr_buf(str, rr, &len, &dname_len, 3600,
253 log_err("error parsing local-data at %d '%s': %s",
254 LDNS_WIREPARSE_OFFSET(s), str,
255 sldns_get_errorstr_parse(s));
258 *nm = memdup(rr, dname_len);
259 *dclass = sldns_wirerr_get_class(rr, len, dname_len);
261 log_err("out of memory");
268 * Find an rrset in local data structure.
269 * @param data: local data domain name structure.
270 * @param type: type to look for (host order).
271 * @return rrset pointer or NULL if not found.
273 static struct local_rrset*
274 local_data_find_type(struct local_data* data, uint16_t type)
276 struct local_rrset* p;
278 for(p = data->rrsets; p; p = p->next) {
279 if(p->rrset->rk.type == type)
285 /** check for RR duplicates */
287 rr_is_duplicate(struct packed_rrset_data* pd, uint8_t* rdata, size_t rdata_len)
290 for(i=0; i<pd->count; i++) {
291 if(pd->rr_len[i] == rdata_len &&
292 memcmp(pd->rr_data[i], rdata, rdata_len) == 0)
298 /** new local_rrset */
299 static struct local_rrset*
300 new_local_rrset(struct regional* region, struct local_data* node,
301 uint16_t rrtype, uint16_t rrclass)
303 struct packed_rrset_data* pd;
304 struct local_rrset* rrset = (struct local_rrset*)
305 regional_alloc_zero(region, sizeof(*rrset));
307 log_err("out of memory");
310 rrset->next = node->rrsets;
311 node->rrsets = rrset;
312 rrset->rrset = (struct ub_packed_rrset_key*)
313 regional_alloc_zero(region, sizeof(*rrset->rrset));
315 log_err("out of memory");
318 rrset->rrset->entry.key = rrset->rrset;
319 pd = (struct packed_rrset_data*)regional_alloc_zero(region,
322 log_err("out of memory");
325 pd->trust = rrset_trust_prim_noglue;
326 pd->security = sec_status_insecure;
327 rrset->rrset->entry.data = pd;
328 rrset->rrset->rk.dname = node->name;
329 rrset->rrset->rk.dname_len = node->namelen;
330 rrset->rrset->rk.type = htons(rrtype);
331 rrset->rrset->rk.rrset_class = htons(rrclass);
335 /** insert RR into RRset data structure; Wastes a couple of bytes */
337 insert_rr(struct regional* region, struct packed_rrset_data* pd,
338 uint8_t* rdata, size_t rdata_len, time_t ttl)
340 size_t* oldlen = pd->rr_len;
341 time_t* oldttl = pd->rr_ttl;
342 uint8_t** olddata = pd->rr_data;
344 /* add RR to rrset */
346 pd->rr_len = regional_alloc(region, sizeof(*pd->rr_len)*pd->count);
347 pd->rr_ttl = regional_alloc(region, sizeof(*pd->rr_ttl)*pd->count);
348 pd->rr_data = regional_alloc(region, sizeof(*pd->rr_data)*pd->count);
349 if(!pd->rr_len || !pd->rr_ttl || !pd->rr_data) {
350 log_err("out of memory");
354 memcpy(pd->rr_len+1, oldlen,
355 sizeof(*pd->rr_len)*(pd->count-1));
356 memcpy(pd->rr_ttl+1, oldttl,
357 sizeof(*pd->rr_ttl)*(pd->count-1));
358 memcpy(pd->rr_data+1, olddata,
359 sizeof(*pd->rr_data)*(pd->count-1));
361 pd->rr_len[0] = rdata_len;
363 pd->rr_data[0] = regional_alloc_init(region, rdata, rdata_len);
364 if(!pd->rr_data[0]) {
365 log_err("out of memory");
371 /** find a data node by exact name */
372 static struct local_data*
373 lz_find_node(struct local_zone* z, uint8_t* nm, size_t nmlen, int nmlabs)
375 struct local_data key;
379 key.namelabs = nmlabs;
380 return (struct local_data*)rbtree_search(&z->data, &key.node);
383 /** find a node, create it if not and all its empty nonterminal parents */
385 lz_find_create_node(struct local_zone* z, uint8_t* nm, size_t nmlen,
386 int nmlabs, struct local_data** res)
388 struct local_data* ld = lz_find_node(z, nm, nmlen, nmlabs);
390 /* create a domain name to store rr. */
391 ld = (struct local_data*)regional_alloc_zero(z->region,
394 log_err("out of memory adding local data");
398 ld->name = regional_alloc_init(z->region, nm, nmlen);
400 log_err("out of memory");
404 ld->namelabs = nmlabs;
405 if(!rbtree_insert(&z->data, &ld->node)) {
406 log_assert(0); /* duplicate name */
408 /* see if empty nonterminals need to be created */
409 if(nmlabs > z->namelabs) {
410 dname_remove_label(&nm, &nmlen);
411 if(!lz_find_create_node(z, nm, nmlen, nmlabs-1, res))
419 /** enter data RR into auth zone */
421 lz_enter_rr_into_zone(struct local_zone* z, const char* rrstr)
426 struct local_data* node;
427 struct local_rrset* rrset;
428 struct packed_rrset_data* pd;
429 uint16_t rrtype = 0, rrclass = 0;
431 uint8_t rr[LDNS_RR_BUF_SIZE];
434 if(!get_rr_content(rrstr, &nm, &rrtype, &rrclass, &ttl, rr, sizeof(rr),
435 &rdata, &rdata_len)) {
436 log_err("bad local-data: %s", rrstr);
439 log_assert(z->dclass == rrclass);
440 if(z->type == local_zone_redirect &&
441 query_dname_compare(z->name, nm) != 0) {
442 log_err("local-data in redirect zone must reside at top of zone"
443 ", not at %s", rrstr);
447 nmlabs = dname_count_size_labels(nm, &nmlen);
448 if(!lz_find_create_node(z, nm, nmlen, nmlabs, &node)) {
455 rrset = local_data_find_type(node, rrtype);
457 rrset = new_local_rrset(z->region, node, rrtype, rrclass);
460 if(query_dname_compare(node->name, z->name) == 0) {
461 if(rrtype == LDNS_RR_TYPE_NSEC)
462 rrset->rrset->rk.flags = PACKED_RRSET_NSEC_AT_APEX;
463 if(rrtype == LDNS_RR_TYPE_SOA)
464 z->soa = rrset->rrset;
467 pd = (struct packed_rrset_data*)rrset->rrset->entry.data;
468 log_assert(rrset && pd);
470 /* check for duplicate RR */
471 if(rr_is_duplicate(pd, rdata, rdata_len)) {
472 verbose(VERB_ALGO, "ignoring duplicate RR: %s", rrstr);
475 return insert_rr(z->region, pd, rdata, rdata_len, ttl);
478 /** enter a data RR into auth data; a zone for it must exist */
480 lz_enter_rr_str(struct local_zones* zones, const char* rr)
486 struct local_zone* z;
488 if(!get_rr_nameclass(rr, &rr_name, &rr_class)) {
489 log_err("bad rr %s", rr);
492 labs = dname_count_size_labels(rr_name, &len);
493 lock_rw_rdlock(&zones->lock);
494 z = local_zones_lookup(zones, rr_name, len, labs, rr_class);
496 lock_rw_unlock(&zones->lock);
497 fatal_exit("internal error: no zone for rr %s", rr);
499 lock_rw_wrlock(&z->lock);
500 lock_rw_unlock(&zones->lock);
502 r = lz_enter_rr_into_zone(z, rr);
503 lock_rw_unlock(&z->lock);
507 /** parse local-zone: statements */
509 lz_enter_zones(struct local_zones* zones, struct config_file* cfg)
511 struct config_str2list* p;
512 struct local_zone* z;
513 for(p = cfg->local_zones; p; p = p->next) {
514 if(!(z=lz_enter_zone(zones, p->str, p->str2,
517 lock_rw_unlock(&z->lock);
522 /** lookup a zone in rbtree; exact match only; SLOW due to parse */
524 lz_exists(struct local_zones* zones, const char* name)
528 z.dclass = LDNS_RR_CLASS_IN;
529 if(!parse_dname(name, &z.name, &z.namelen, &z.namelabs)) {
530 log_err("bad name %s", name);
533 lock_rw_rdlock(&zones->lock);
534 if(rbtree_search(&zones->ztree, &z.node)) {
535 lock_rw_unlock(&zones->lock);
539 lock_rw_unlock(&zones->lock);
544 /** lookup a zone in cfg->nodefault list */
546 lz_nodefault(struct config_file* cfg, const char* name)
548 struct config_strlist* p;
549 size_t len = strlen(name);
550 if(len == 0) return 0;
551 if(name[len-1] == '.') len--;
553 for(p = cfg->local_zones_nodefault; p; p = p->next) {
554 /* compare zone name, lowercase, compare without ending . */
555 if(strncasecmp(p->str, name, len) == 0 &&
556 (strlen(p->str) == len || (strlen(p->str)==len+1 &&
557 p->str[len] == '.')))
563 /** enter AS112 default zone */
565 add_as112_default(struct local_zones* zones, struct config_file* cfg,
568 struct local_zone* z;
569 char str[1024]; /* known long enough */
570 if(lz_exists(zones, name) || lz_nodefault(cfg, name))
571 return 1; /* do not enter default content */
572 if(!(z=lz_enter_zone(zones, name, "static", LDNS_RR_CLASS_IN)))
574 snprintf(str, sizeof(str), "%s 10800 IN SOA localhost. "
575 "nobody.invalid. 1 3600 1200 604800 10800", name);
576 if(!lz_enter_rr_into_zone(z, str)) {
577 lock_rw_unlock(&z->lock);
580 snprintf(str, sizeof(str), "%s 10800 IN NS localhost. ", name);
581 if(!lz_enter_rr_into_zone(z, str)) {
582 lock_rw_unlock(&z->lock);
585 lock_rw_unlock(&z->lock);
589 /** enter default zones */
591 lz_enter_defaults(struct local_zones* zones, struct config_file* cfg)
593 struct local_zone* z;
595 /* this list of zones is from RFC 6303 */
597 /* block localhost level zones, first, later the LAN zones */
599 /* localhost. zone */
600 if(!lz_exists(zones, "localhost.") &&
601 !lz_nodefault(cfg, "localhost.")) {
602 if(!(z=lz_enter_zone(zones, "localhost.", "static",
603 LDNS_RR_CLASS_IN)) ||
604 !lz_enter_rr_into_zone(z,
605 "localhost. 10800 IN NS localhost.") ||
606 !lz_enter_rr_into_zone(z,
607 "localhost. 10800 IN SOA localhost. nobody.invalid. "
608 "1 3600 1200 604800 10800") ||
609 !lz_enter_rr_into_zone(z,
610 "localhost. 10800 IN A 127.0.0.1") ||
611 !lz_enter_rr_into_zone(z,
612 "localhost. 10800 IN AAAA ::1")) {
613 log_err("out of memory adding default zone");
614 if(z) { lock_rw_unlock(&z->lock); }
617 lock_rw_unlock(&z->lock);
619 /* reverse ip4 zone */
620 if(!lz_exists(zones, "127.in-addr.arpa.") &&
621 !lz_nodefault(cfg, "127.in-addr.arpa.")) {
622 if(!(z=lz_enter_zone(zones, "127.in-addr.arpa.", "static",
623 LDNS_RR_CLASS_IN)) ||
624 !lz_enter_rr_into_zone(z,
625 "127.in-addr.arpa. 10800 IN NS localhost.") ||
626 !lz_enter_rr_into_zone(z,
627 "127.in-addr.arpa. 10800 IN SOA localhost. "
628 "nobody.invalid. 1 3600 1200 604800 10800") ||
629 !lz_enter_rr_into_zone(z,
630 "1.0.0.127.in-addr.arpa. 10800 IN PTR localhost.")) {
631 log_err("out of memory adding default zone");
632 if(z) { lock_rw_unlock(&z->lock); }
635 lock_rw_unlock(&z->lock);
637 /* reverse ip6 zone */
638 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.") &&
639 !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.")) {
640 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",
641 LDNS_RR_CLASS_IN)) ||
642 !lz_enter_rr_into_zone(z,
643 "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.") ||
644 !lz_enter_rr_into_zone(z,
645 "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. "
646 "nobody.invalid. 1 3600 1200 604800 10800") ||
647 !lz_enter_rr_into_zone(z,
648 "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.")) {
649 log_err("out of memory adding default zone");
650 if(z) { lock_rw_unlock(&z->lock); }
653 lock_rw_unlock(&z->lock);
656 /* if unblock lan-zones, then do not add the zones below.
657 * we do add the zones above, about 127.0.0.1, because localhost is
659 if(cfg->unblock_lan_zones)
662 /* block LAN level zones */
663 if ( !add_as112_default(zones, cfg, "10.in-addr.arpa.") ||
664 !add_as112_default(zones, cfg, "16.172.in-addr.arpa.") ||
665 !add_as112_default(zones, cfg, "17.172.in-addr.arpa.") ||
666 !add_as112_default(zones, cfg, "18.172.in-addr.arpa.") ||
667 !add_as112_default(zones, cfg, "19.172.in-addr.arpa.") ||
668 !add_as112_default(zones, cfg, "20.172.in-addr.arpa.") ||
669 !add_as112_default(zones, cfg, "21.172.in-addr.arpa.") ||
670 !add_as112_default(zones, cfg, "22.172.in-addr.arpa.") ||
671 !add_as112_default(zones, cfg, "23.172.in-addr.arpa.") ||
672 !add_as112_default(zones, cfg, "24.172.in-addr.arpa.") ||
673 !add_as112_default(zones, cfg, "25.172.in-addr.arpa.") ||
674 !add_as112_default(zones, cfg, "26.172.in-addr.arpa.") ||
675 !add_as112_default(zones, cfg, "27.172.in-addr.arpa.") ||
676 !add_as112_default(zones, cfg, "28.172.in-addr.arpa.") ||
677 !add_as112_default(zones, cfg, "29.172.in-addr.arpa.") ||
678 !add_as112_default(zones, cfg, "30.172.in-addr.arpa.") ||
679 !add_as112_default(zones, cfg, "31.172.in-addr.arpa.") ||
680 !add_as112_default(zones, cfg, "168.192.in-addr.arpa.") ||
681 !add_as112_default(zones, cfg, "0.in-addr.arpa.") ||
682 !add_as112_default(zones, cfg, "254.169.in-addr.arpa.") ||
683 !add_as112_default(zones, cfg, "2.0.192.in-addr.arpa.") ||
684 !add_as112_default(zones, cfg, "100.51.198.in-addr.arpa.") ||
685 !add_as112_default(zones, cfg, "113.0.203.in-addr.arpa.") ||
686 !add_as112_default(zones, cfg, "255.255.255.255.in-addr.arpa.") ||
687 !add_as112_default(zones, cfg, "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.") ||
688 !add_as112_default(zones, cfg, "d.f.ip6.arpa.") ||
689 !add_as112_default(zones, cfg, "8.e.f.ip6.arpa.") ||
690 !add_as112_default(zones, cfg, "9.e.f.ip6.arpa.") ||
691 !add_as112_default(zones, cfg, "a.e.f.ip6.arpa.") ||
692 !add_as112_default(zones, cfg, "b.e.f.ip6.arpa.") ||
693 !add_as112_default(zones, cfg, "8.b.d.0.1.0.0.2.ip6.arpa.")) {
694 log_err("out of memory adding default zone");
700 /** setup parent pointers, so that a lookup can be done for closest match */
702 init_parents(struct local_zones* zones)
704 struct local_zone* node, *prev = NULL, *p;
706 lock_rw_wrlock(&zones->lock);
707 RBTREE_FOR(node, struct local_zone*, &zones->ztree) {
708 lock_rw_wrlock(&node->lock);
710 if(!prev || prev->dclass != node->dclass) {
712 lock_rw_unlock(&node->lock);
715 (void)dname_lab_cmp(prev->name, prev->namelabs, node->name,
716 node->namelabs, &m); /* we know prev is smaller */
717 /* sort order like: . com. bla.com. zwb.com. net. */
718 /* find the previous, or parent-parent-parent */
719 for(p = prev; p; p = p->parent)
720 /* looking for name with few labels, a parent */
721 if(p->namelabs <= m) {
722 /* ==: since prev matched m, this is closest*/
723 /* <: prev matches more, but is not a parent,
724 * this one is a (grand)parent */
729 lock_rw_unlock(&node->lock);
731 lock_rw_unlock(&zones->lock);
734 /** enter implicit transparent zone for local-data: without local-zone: */
736 lz_setup_implicit(struct local_zones* zones, struct config_file* cfg)
738 /* walk over all items that have no parent zone and find
739 * the name that covers them all (could be the root) and
740 * add that as a transparent zone */
741 struct config_strlist* p;
743 int have_other_classes = 0;
748 int match = 0; /* number of labels match count */
750 init_parents(zones); /* to enable local_zones_lookup() */
751 for(p = cfg->local_data; p; p = p->next) {
756 if(!get_rr_nameclass(p->str, &rr_name, &rr_class)) {
757 log_err("Bad local-data RR %s", p->str);
760 labs = dname_count_size_labels(rr_name, &len);
761 lock_rw_rdlock(&zones->lock);
762 if(!local_zones_lookup(zones, rr_name, len, labs, rr_class)) {
772 if(rr_class != dclass) {
773 /* process other classes later */
775 have_other_classes = 1;
776 lock_rw_unlock(&zones->lock);
779 /* find smallest shared topdomain */
780 (void)dname_lab_cmp(nm, nmlabs,
786 } else free(rr_name);
787 lock_rw_unlock(&zones->lock);
791 struct local_zone* z;
792 /* allocate zone of smallest shared topdomain to contain em */
794 dname_remove_labels(&n2, &nmlen, nmlabs - match);
795 n2 = memdup(n2, nmlen);
798 log_err("out of memory");
801 log_nametypeclass(VERB_ALGO, "implicit transparent local-zone",
803 if(!(z=lz_enter_zone_dname(zones, n2, nmlen, match,
804 local_zone_transparent, dclass))) {
807 lock_rw_unlock(&z->lock);
809 if(have_other_classes) {
810 /* restart to setup other class */
811 return lz_setup_implicit(zones, cfg);
816 /** enter auth data */
818 lz_enter_data(struct local_zones* zones, struct config_file* cfg)
820 struct config_strlist* p;
821 for(p = cfg->local_data; p; p = p->next) {
822 if(!lz_enter_rr_str(zones, p->str))
828 /** free memory from config */
830 lz_freeup_cfg(struct config_file* cfg)
832 config_deldblstrlist(cfg->local_zones);
833 cfg->local_zones = NULL;
834 config_delstrlist(cfg->local_zones_nodefault);
835 cfg->local_zones_nodefault = NULL;
836 config_delstrlist(cfg->local_data);
837 cfg->local_data = NULL;
841 local_zones_apply_cfg(struct local_zones* zones, struct config_file* cfg)
843 /* create zones from zone statements. */
844 if(!lz_enter_zones(zones, cfg)) {
847 /* apply default zones+content (unless disabled, or overridden) */
848 if(!lz_enter_defaults(zones, cfg)) {
851 /* create implicit transparent zone from data. */
852 if(!lz_setup_implicit(zones, cfg)) {
856 /* setup parent ptrs for lookup during data entry */
858 /* insert local data */
859 if(!lz_enter_data(zones, cfg)) {
862 /* freeup memory from cfg struct. */
868 local_zones_lookup(struct local_zones* zones,
869 uint8_t* name, size_t len, int labs, uint16_t dclass)
871 rbnode_t* res = NULL;
872 struct local_zone *result;
873 struct local_zone key;
879 if(rbtree_find_less_equal(&zones->ztree, &key, &res)) {
881 return (struct local_zone*)res;
883 /* smaller element (or no element) */
885 result = (struct local_zone*)res;
886 if(!result || result->dclass != dclass)
888 /* count number of labels matched */
889 (void)dname_lab_cmp(result->name, result->namelabs, key.name,
891 while(result) { /* go up until qname is subdomain of zone */
892 if(result->namelabs <= m)
894 result = result->parent;
901 local_zones_find(struct local_zones* zones,
902 uint8_t* name, size_t len, int labs, uint16_t dclass)
904 struct local_zone key;
911 return (struct local_zone*)rbtree_search(&zones->ztree, &key);
914 /** print all RRsets in local zone */
916 local_zone_out(struct local_zone* z)
918 struct local_data* d;
919 struct local_rrset* p;
920 RBTREE_FOR(d, struct local_data*, &z->data) {
921 for(p = d->rrsets; p; p = p->next) {
922 log_nametypeclass(0, "rrset", d->name,
923 ntohs(p->rrset->rk.type),
924 ntohs(p->rrset->rk.rrset_class));
929 void local_zones_print(struct local_zones* zones)
931 struct local_zone* z;
932 lock_rw_rdlock(&zones->lock);
933 log_info("number of auth zones %u", (unsigned)zones->ztree.count);
934 RBTREE_FOR(z, struct local_zone*, &zones->ztree) {
935 lock_rw_rdlock(&z->lock);
937 case local_zone_deny:
938 log_nametypeclass(0, "deny zone",
939 z->name, 0, z->dclass);
941 case local_zone_refuse:
942 log_nametypeclass(0, "refuse zone",
943 z->name, 0, z->dclass);
945 case local_zone_redirect:
946 log_nametypeclass(0, "redirect zone",
947 z->name, 0, z->dclass);
949 case local_zone_transparent:
950 log_nametypeclass(0, "transparent zone",
951 z->name, 0, z->dclass);
953 case local_zone_typetransparent:
954 log_nametypeclass(0, "typetransparent zone",
955 z->name, 0, z->dclass);
957 case local_zone_static:
958 log_nametypeclass(0, "static zone",
959 z->name, 0, z->dclass);
962 log_nametypeclass(0, "badtyped zone",
963 z->name, 0, z->dclass);
967 lock_rw_unlock(&z->lock);
969 lock_rw_unlock(&zones->lock);
972 /** encode answer consisting of 1 rrset */
974 local_encode(struct query_info* qinfo, struct edns_data* edns,
975 sldns_buffer* buf, struct regional* temp,
976 struct ub_packed_rrset_key* rrset, int ansec, int rcode)
978 struct reply_info rep;
980 /* make answer with time=0 for fixed TTL values */
981 memset(&rep, 0, sizeof(rep));
982 rep.flags = (uint16_t)((BIT_QR | BIT_AA | BIT_RA) | rcode);
985 rep.an_numrrsets = 1;
986 else rep.ns_numrrsets = 1;
989 udpsize = edns->udp_size;
990 edns->edns_version = EDNS_ADVERTISED_VERSION;
991 edns->udp_size = EDNS_ADVERTISED_SIZE;
993 edns->bits &= EDNS_DO;
994 if(!reply_info_answer_encode(qinfo, &rep,
995 *(uint16_t*)sldns_buffer_begin(buf),
996 sldns_buffer_read_u16_at(buf, 2),
997 buf, 0, 0, temp, udpsize, edns,
998 (int)(edns->bits&EDNS_DO), 0))
999 error_encode(buf, (LDNS_RCODE_SERVFAIL|BIT_AA), qinfo,
1000 *(uint16_t*)sldns_buffer_begin(buf),
1001 sldns_buffer_read_u16_at(buf, 2), edns);
1005 /** answer local data match */
1007 local_data_answer(struct local_zone* z, struct query_info* qinfo,
1008 struct edns_data* edns, sldns_buffer* buf, struct regional* temp,
1009 int labs, struct local_data** ldp)
1011 struct local_data key;
1012 struct local_data* ld;
1013 struct local_rrset* lr;
1014 key.node.key = &key;
1015 key.name = qinfo->qname;
1016 key.namelen = qinfo->qname_len;
1017 key.namelabs = labs;
1018 if(z->type == local_zone_redirect) {
1020 key.namelen = z->namelen;
1021 key.namelabs = z->namelabs;
1023 ld = (struct local_data*)rbtree_search(&z->data, &key.node);
1028 lr = local_data_find_type(ld, qinfo->qtype);
1031 if(z->type == local_zone_redirect) {
1032 /* convert rrset name to query name; like a wildcard */
1033 struct ub_packed_rrset_key r = *lr->rrset;
1034 r.rk.dname = qinfo->qname;
1035 r.rk.dname_len = qinfo->qname_len;
1036 return local_encode(qinfo, edns, buf, temp, &r, 1,
1037 LDNS_RCODE_NOERROR);
1039 return local_encode(qinfo, edns, buf, temp, lr->rrset, 1,
1040 LDNS_RCODE_NOERROR);
1044 * answer in case where no exact match is found
1045 * @param z: zone for query
1046 * @param qinfo: query
1047 * @param edns: edns from query
1048 * @param buf: buffer for answer.
1049 * @param temp: temp region for encoding
1050 * @param ld: local data, if NULL, no such name exists in localdata.
1051 * @return 1 if a reply is to be sent, 0 if not.
1054 lz_zone_answer(struct local_zone* z, struct query_info* qinfo,
1055 struct edns_data* edns, sldns_buffer* buf, struct regional* temp,
1056 struct local_data* ld)
1058 if(z->type == local_zone_deny) {
1059 /** no reply at all, signal caller by clearing buffer. */
1060 sldns_buffer_clear(buf);
1061 sldns_buffer_flip(buf);
1063 } else if(z->type == local_zone_refuse) {
1064 error_encode(buf, (LDNS_RCODE_REFUSED|BIT_AA), qinfo,
1065 *(uint16_t*)sldns_buffer_begin(buf),
1066 sldns_buffer_read_u16_at(buf, 2), edns);
1068 } else if(z->type == local_zone_static ||
1069 z->type == local_zone_redirect) {
1070 /* for static, reply nodata or nxdomain
1071 * for redirect, reply nodata */
1072 /* no additional section processing,
1073 * cname, dname or wildcard processing,
1074 * or using closest match for NSEC.
1075 * or using closest match for returning delegation downwards
1077 int rcode = ld?LDNS_RCODE_NOERROR:LDNS_RCODE_NXDOMAIN;
1079 return local_encode(qinfo, edns, buf, temp,
1081 error_encode(buf, (rcode|BIT_AA), qinfo,
1082 *(uint16_t*)sldns_buffer_begin(buf),
1083 sldns_buffer_read_u16_at(buf, 2), edns);
1085 } else if(z->type == local_zone_typetransparent) {
1086 /* no NODATA or NXDOMAINS for this zone type */
1089 /* else z->type == local_zone_transparent */
1091 /* if the zone is transparent and the name exists, but the type
1092 * does not, then we should make this noerror/nodata */
1093 if(ld && ld->rrsets) {
1094 int rcode = LDNS_RCODE_NOERROR;
1096 return local_encode(qinfo, edns, buf, temp,
1098 error_encode(buf, (rcode|BIT_AA), qinfo,
1099 *(uint16_t*)sldns_buffer_begin(buf),
1100 sldns_buffer_read_u16_at(buf, 2), edns);
1104 /* stop here, and resolve further on */
1109 local_zones_answer(struct local_zones* zones, struct query_info* qinfo,
1110 struct edns_data* edns, sldns_buffer* buf, struct regional* temp)
1112 /* see if query is covered by a zone,
1113 * if so: - try to match (exact) local data
1114 * - look at zone type for negative response. */
1115 int labs = dname_count_labels(qinfo->qname);
1116 struct local_data* ld;
1117 struct local_zone* z;
1119 lock_rw_rdlock(&zones->lock);
1120 z = local_zones_lookup(zones, qinfo->qname,
1121 qinfo->qname_len, labs, qinfo->qclass);
1123 lock_rw_unlock(&zones->lock);
1126 lock_rw_rdlock(&z->lock);
1127 lock_rw_unlock(&zones->lock);
1129 if(local_data_answer(z, qinfo, edns, buf, temp, labs, &ld)) {
1130 lock_rw_unlock(&z->lock);
1133 r = lz_zone_answer(z, qinfo, edns, buf, temp, ld);
1134 lock_rw_unlock(&z->lock);
1138 const char* local_zone_type2str(enum localzone_type t)
1141 case local_zone_deny: return "deny";
1142 case local_zone_refuse: return "refuse";
1143 case local_zone_redirect: return "redirect";
1144 case local_zone_transparent: return "transparent";
1145 case local_zone_typetransparent: return "typetransparent";
1146 case local_zone_static: return "static";
1147 case local_zone_nodefault: return "nodefault";
1152 int local_zone_str2type(const char* type, enum localzone_type* t)
1154 if(strcmp(type, "deny") == 0)
1155 *t = local_zone_deny;
1156 else if(strcmp(type, "refuse") == 0)
1157 *t = local_zone_refuse;
1158 else if(strcmp(type, "static") == 0)
1159 *t = local_zone_static;
1160 else if(strcmp(type, "transparent") == 0)
1161 *t = local_zone_transparent;
1162 else if(strcmp(type, "typetransparent") == 0)
1163 *t = local_zone_typetransparent;
1164 else if(strcmp(type, "redirect") == 0)
1165 *t = local_zone_redirect;
1170 /** iterate over the kiddies of the given name and set their parent ptr */
1172 set_kiddo_parents(struct local_zone* z, struct local_zone* match,
1173 struct local_zone* newp)
1175 /* both zones and z are locked already */
1176 /* in the sorted rbtree, the kiddies of z are located after z */
1177 /* z must be present in the tree */
1178 struct local_zone* p = z;
1179 p = (struct local_zone*)rbtree_next(&p->node);
1180 while(p!=(struct local_zone*)RBTREE_NULL &&
1181 p->dclass == z->dclass && dname_strict_subdomain(p->name,
1182 p->namelabs, z->name, z->namelabs)) {
1183 /* update parent ptr */
1184 /* only when matches with existing parent pointer, so that
1185 * deeper child structures are not touched, i.e.
1186 * update of x, and a.x, b.x, f.b.x, g.b.x, c.x, y
1187 * gets to update a.x, b.x and c.x */
1188 lock_rw_wrlock(&p->lock);
1189 if(p->parent == match)
1191 lock_rw_unlock(&p->lock);
1192 p = (struct local_zone*)rbtree_next(&p->node);
1196 struct local_zone* local_zones_add_zone(struct local_zones* zones,
1197 uint8_t* name, size_t len, int labs, uint16_t dclass,
1198 enum localzone_type tp)
1201 struct local_zone* z = local_zone_create(name, len, labs, tp, dclass);
1203 lock_rw_wrlock(&z->lock);
1205 /* find the closest parent */
1206 z->parent = local_zones_find(zones, name, len, labs, dclass);
1208 /* insert into the tree */
1209 if(!rbtree_insert(&zones->ztree, &z->node)) {
1210 /* duplicate entry! */
1211 lock_rw_unlock(&z->lock);
1212 local_zone_delete(z);
1213 log_err("internal: duplicate entry in local_zones_add_zone");
1217 /* set parent pointers right */
1218 set_kiddo_parents(z, z->parent, z);
1220 lock_rw_unlock(&z->lock);
1224 void local_zones_del_zone(struct local_zones* zones, struct local_zone* z)
1226 /* fix up parents in tree */
1227 lock_rw_wrlock(&z->lock);
1228 set_kiddo_parents(z, z, z->parent);
1230 /* remove from tree */
1231 (void)rbtree_delete(&zones->ztree, z);
1233 /* delete the zone */
1234 lock_rw_unlock(&z->lock);
1235 local_zone_delete(z);
1239 local_zones_add_RR(struct local_zones* zones, const char* rr)
1245 struct local_zone* z;
1247 if(!get_rr_nameclass(rr, &rr_name, &rr_class)) {
1250 labs = dname_count_size_labels(rr_name, &len);
1251 /* could first try readlock then get writelock if zone does not exist,
1252 * but we do not add enough RRs (from multiple threads) to optimize */
1253 lock_rw_wrlock(&zones->lock);
1254 z = local_zones_lookup(zones, rr_name, len, labs, rr_class);
1256 z = local_zones_add_zone(zones, rr_name, len, labs, rr_class,
1257 local_zone_transparent);
1259 lock_rw_unlock(&zones->lock);
1265 lock_rw_wrlock(&z->lock);
1266 lock_rw_unlock(&zones->lock);
1267 r = lz_enter_rr_into_zone(z, rr);
1268 lock_rw_unlock(&z->lock);
1272 /** returns true if the node is terminal so no deeper domain names exist */
1274 is_terminal(struct local_data* d)
1276 /* for empty nonterminals, the deeper domain names are sorted
1277 * right after them, so simply check the next name in the tree
1279 struct local_data* n = (struct local_data*)rbtree_next(&d->node);
1280 if(n == (struct local_data*)RBTREE_NULL)
1281 return 1; /* last in tree, no deeper node */
1282 if(dname_strict_subdomain(n->name, n->namelabs, d->name, d->namelabs))
1283 return 0; /* there is a deeper node */
1287 /** delete empty terminals from tree when final data is deleted */
1289 del_empty_term(struct local_zone* z, struct local_data* d,
1290 uint8_t* name, size_t len, int labs)
1292 while(d && d->rrsets == NULL && is_terminal(d)) {
1293 /* is this empty nonterminal? delete */
1294 /* note, no memory recycling in zone region */
1295 (void)rbtree_delete(&z->data, d);
1297 /* go up and to the next label */
1298 if(dname_is_root(name))
1300 dname_remove_label(&name, &len);
1302 d = lz_find_node(z, name, len, labs);
1306 void local_zones_del_data(struct local_zones* zones,
1307 uint8_t* name, size_t len, int labs, uint16_t dclass)
1310 struct local_zone* z;
1311 struct local_data* d;
1312 lock_rw_rdlock(&zones->lock);
1313 z = local_zones_lookup(zones, name, len, labs, dclass);
1315 /* no such zone, we're done */
1316 lock_rw_unlock(&zones->lock);
1319 lock_rw_wrlock(&z->lock);
1320 lock_rw_unlock(&zones->lock);
1322 /* find the domain */
1323 d = lz_find_node(z, name, len, labs);
1325 /* no memory recycling for zone deletions ... */
1327 /* did we delete the soa record ? */
1328 if(query_dname_compare(d->name, z->name) == 0)
1331 /* cleanup the empty nonterminals for this name */
1332 del_empty_term(z, d, name, len, labs);
1335 lock_rw_unlock(&z->lock);