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5e4e917055
freebsd-skq/services/localzone.c
des 5e4e917055 import unbound 1.5.9
2016-09-03 15:08:13 +00:00

1418 lines
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/*
* 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 COPYRIGHT
* HOLDER 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 "services/localzone.h"
#include "sldns/str2wire.h"
#include "sldns/sbuffer.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/netevent.h"
#include "util/data/msgreply.h"
#include "util/data/msgparse.h"
#include "util/as112.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_rw_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_rw_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->taglist);
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)
{
*res = sldns_str2wire_dname(str, len);
*labs = 0;
if(!*res) {
log_err("cannot parse name %s", str);
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) {
free(nm);
log_err("out of memory");
return NULL;
}
/* add to rbtree */
lock_rw_wrlock(&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_rw_unlock(&zones->lock);
return NULL;
}
lock_rw_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, time_t* ttl, uint8_t* rr, size_t len,
uint8_t** rdata, size_t* rdata_len)
{
size_t dname_len = 0;
int e = sldns_str2wire_rr_buf(str, rr, &len, &dname_len, 3600,
NULL, 0, NULL, 0);
if(e) {
log_err("error parsing local-data at %d: '%s': %s",
LDNS_WIREPARSE_OFFSET(e), str,
sldns_get_errorstr_parse(e));
return 0;
}
*nm = memdup(rr, dname_len);
if(!*nm) {
log_err("out of memory");
return 0;
}
*dclass = sldns_wirerr_get_class(rr, len, dname_len);
*type = sldns_wirerr_get_type(rr, len, dname_len);
*ttl = (time_t)sldns_wirerr_get_ttl(rr, len, dname_len);
*rdata = sldns_wirerr_get_rdatawl(rr, len, dname_len);
*rdata_len = sldns_wirerr_get_rdatalen(rr, len, dname_len)+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)
{
uint8_t rr[LDNS_RR_BUF_SIZE];
size_t len = sizeof(rr), dname_len = 0;
int s = sldns_str2wire_rr_buf(str, rr, &len, &dname_len, 3600,
NULL, 0, NULL, 0);
if(s != 0) {
log_err("error parsing local-data at %d '%s': %s",
LDNS_WIREPARSE_OFFSET(s), str,
sldns_get_errorstr_parse(s));
return 0;
}
*nm = memdup(rr, dname_len);
*dclass = sldns_wirerr_get_class(rr, len, dname_len);
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, uint8_t* rdata, size_t rdata_len)
{
size_t i;
for(i=0; i<pd->count; i++) {
if(pd->rr_len[i] == rdata_len &&
memcmp(pd->rr_data[i], rdata, rdata_len) == 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,
uint8_t* rdata, size_t rdata_len, time_t ttl)
{
size_t* oldlen = pd->rr_len;
time_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] = rdata_len;
pd->rr_ttl[0] = ttl;
pd->rr_data[0] = regional_alloc_init(region, rdata, rdata_len);
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, 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 = 0, rrclass = 0;
time_t ttl = 0;
uint8_t rr[LDNS_RR_BUF_SIZE];
uint8_t* rdata;
size_t rdata_len;
if(!get_rr_content(rrstr, &nm, &rrtype, &rrclass, &ttl, rr, sizeof(rr),
&rdata, &rdata_len)) {
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, rdata, rdata_len)) {
verbose(VERB_ALGO, "ignoring duplicate RR: %s", rrstr);
return 1;
}
return insert_rr(z->region, pd, rdata, rdata_len, 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)
{
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_rw_rdlock(&zones->lock);
z = local_zones_lookup(zones, rr_name, len, labs, rr_class);
if(!z) {
lock_rw_unlock(&zones->lock);
fatal_exit("internal error: no zone for rr %s", rr);
}
lock_rw_wrlock(&z->lock);
lock_rw_unlock(&zones->lock);
free(rr_name);
r = lz_enter_rr_into_zone(z, rr);
lock_rw_unlock(&z->lock);
return r;
}
/** enter tagstring into zone */
static int
lz_enter_zone_tag(struct local_zones* zones, char* zname, uint8_t* list,
size_t len, uint16_t rr_class)
{
uint8_t dname[LDNS_MAX_DOMAINLEN+1];
size_t dname_len = sizeof(dname);
int dname_labs, r = 0;
struct local_zone* z;
if(sldns_str2wire_dname_buf(zname, dname, &dname_len) != 0) {
log_err("cannot parse zone name in local-zone-tag: %s", zname);
return 0;
}
dname_labs = dname_count_labels(dname);
lock_rw_rdlock(&zones->lock);
z = local_zones_lookup(zones, dname, dname_len, dname_labs, rr_class);
if(!z) {
lock_rw_unlock(&zones->lock);
log_err("no local-zone for tag %s", zname);
return 0;
}
lock_rw_wrlock(&z->lock);
lock_rw_unlock(&zones->lock);
free(z->taglist);
z->taglist = memdup(list, len);
z->taglen = len;
if(z->taglist)
r = 1;
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_rw_rdlock(&zones->lock);
if(rbtree_search(&zones->ztree, &z.node)) {
lock_rw_unlock(&zones->lock);
free(z.name);
return 1;
}
lock_rw_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,
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, 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, 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)
{
struct local_zone* z;
const char** zstr;
/* this list of zones is from RFC 6303 and RFC 7686 */
/* block localhost level zones first, then onion and later the LAN zones */
/* 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,
"localhost. 10800 IN NS localhost.") ||
!lz_enter_rr_into_zone(z,
"localhost. 10800 IN SOA localhost. nobody.invalid. "
"1 3600 1200 604800 10800") ||
!lz_enter_rr_into_zone(z,
"localhost. 10800 IN A 127.0.0.1") ||
!lz_enter_rr_into_zone(z,
"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,
"127.in-addr.arpa. 10800 IN NS localhost.") ||
!lz_enter_rr_into_zone(z,
"127.in-addr.arpa. 10800 IN SOA localhost. "
"nobody.invalid. 1 3600 1200 604800 10800") ||
!lz_enter_rr_into_zone(z,
"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,
"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,
"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,
"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);
}
/* onion. zone (RFC 7686) */
if(!lz_exists(zones, "onion.") &&
!lz_nodefault(cfg, "onion.")) {
if(!(z=lz_enter_zone(zones, "onion.", "static",
LDNS_RR_CLASS_IN)) ||
!lz_enter_rr_into_zone(z,
"onion. 10800 IN NS localhost.") ||
!lz_enter_rr_into_zone(z,
"onion. 10800 IN SOA localhost. nobody.invalid. "
"1 3600 1200 604800 10800")) {
log_err("out of memory adding default zone");
if(z) { lock_rw_unlock(&z->lock); }
return 0;
}
lock_rw_unlock(&z->lock);
}
/* block AS112 zones, unless asked not to */
if(!cfg->unblock_lan_zones) {
for(zstr = as112_zones; *zstr; zstr++) {
if(!add_as112_default(zones, cfg, *zstr)) {
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_rw_wrlock(&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_rw_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_rw_rdlock(&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_rw_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_rw_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 local-zone-tag info */
static int
lz_enter_zone_tags(struct local_zones* zones, struct config_file* cfg)
{
struct config_strbytelist* p;
int c = 0;
for(p = cfg->local_zone_tags; p; p = p->next) {
if(!lz_enter_zone_tag(zones, p->str, p->str2, p->str2len,
LDNS_RR_CLASS_IN))
return 0;
c++;
}
if(c) verbose(VERB_ALGO, "applied tags to %d local zones", c);
return 1;
}
/** enter auth data */
static int
lz_enter_data(struct local_zones* zones, struct config_file* cfg)
{
struct config_strlist* p;
for(p = cfg->local_data; p; p = p->next) {
if(!lz_enter_rr_str(zones, p->str))
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)
{
/* create zones from zone statements. */
if(!lz_enter_zones(zones, cfg)) {
return 0;
}
/* apply default zones+content (unless disabled, or overridden) */
if(!lz_enter_defaults(zones, cfg)) {
return 0;
}
/* create implicit transparent zone from data. */
if(!lz_setup_implicit(zones, cfg)) {
return 0;
}
/* setup parent ptrs for lookup during data entry */
init_parents(zones);
/* insert local zone tags */
if(!lz_enter_zone_tags(zones, cfg)) {
return 0;
}
/* insert local data */
if(!lz_enter_data(zones, cfg)) {
return 0;
}
/* freeup memory from cfg struct. */
lz_freeup_cfg(cfg);
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_rw_rdlock(&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_typetransparent:
log_nametypeclass(0, "typetransparent zone",
z->name, 0, z->dclass);
break;
case local_zone_static:
log_nametypeclass(0, "static zone",
z->name, 0, z->dclass);
break;
case local_zone_inform:
log_nametypeclass(0, "inform zone",
z->name, 0, z->dclass);
break;
case local_zone_inform_deny:
log_nametypeclass(0, "inform_deny 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_rw_unlock(&zones->lock);
}
/** encode answer consisting of 1 rrset */
static int
local_encode(struct query_info* qinfo, struct edns_data* edns,
sldns_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(!edns_opt_inplace_reply(edns, temp) ||
!reply_info_answer_encode(qinfo, &rep,
*(uint16_t*)sldns_buffer_begin(buf),
sldns_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*)sldns_buffer_begin(buf),
sldns_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, sldns_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, sldns_buffer* buf, struct regional* temp,
struct local_data* ld)
{
if(z->type == local_zone_deny || z->type == local_zone_inform_deny) {
/** no reply at all, signal caller by clearing buffer. */
sldns_buffer_clear(buf);
sldns_buffer_flip(buf);
return 1;
} else if(z->type == local_zone_refuse) {
error_encode(buf, (LDNS_RCODE_REFUSED|BIT_AA), qinfo,
*(uint16_t*)sldns_buffer_begin(buf),
sldns_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*)sldns_buffer_begin(buf),
sldns_buffer_read_u16_at(buf, 2), edns);
return 1;
} else if(z->type == local_zone_typetransparent) {
/* no NODATA or NXDOMAINS for this zone type */
return 0;
}
/* 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*)sldns_buffer_begin(buf),
sldns_buffer_read_u16_at(buf, 2), edns);
return 1;
}
/* stop here, and resolve further on */
return 0;
}
/** print log information for an inform zone query */
static void
lz_inform_print(struct local_zone* z, struct query_info* qinfo,
struct comm_reply* repinfo)
{
char ip[128], txt[512];
char zname[LDNS_MAX_DOMAINLEN+1];
uint16_t port = ntohs(((struct sockaddr_in*)&repinfo->addr)->sin_port);
dname_str(z->name, zname);
addr_to_str(&repinfo->addr, repinfo->addrlen, ip, sizeof(ip));
snprintf(txt, sizeof(txt), "%s inform %s@%u", zname, ip,
(unsigned)port);
log_nametypeclass(0, txt, qinfo->qname, qinfo->qtype, qinfo->qclass);
}
int
local_zones_answer(struct local_zones* zones, struct query_info* qinfo,
struct edns_data* edns, sldns_buffer* buf, struct regional* temp,
struct comm_reply* repinfo)
{
/* 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_rw_rdlock(&zones->lock);
z = local_zones_lookup(zones, qinfo->qname,
qinfo->qname_len, labs, qinfo->qclass);
if(!z) {
lock_rw_unlock(&zones->lock);
return 0;
}
lock_rw_rdlock(&z->lock);
lock_rw_unlock(&zones->lock);
if((z->type == local_zone_inform || z->type == local_zone_inform_deny)
&& repinfo)
lz_inform_print(z, qinfo, repinfo);
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_typetransparent: return "typetransparent";
case local_zone_static: return "static";
case local_zone_nodefault: return "nodefault";
case local_zone_inform: return "inform";
case local_zone_inform_deny: return "inform_deny";
}
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, "typetransparent") == 0)
*t = local_zone_typetransparent;
else if(strcmp(type, "redirect") == 0)
*t = local_zone_redirect;
else if(strcmp(type, "inform") == 0)
*t = local_zone_inform;
else if(strcmp(type, "inform_deny") == 0)
*t = local_zone_inform_deny;
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) {
free(name);
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)
{
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);
/* could first try readlock then get writelock if zone does not exist,
* but we do not add enough RRs (from multiple threads) to optimize */
lock_rw_wrlock(&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_rw_unlock(&zones->lock);
return 0;
}
} else {
free(rr_name);
}
lock_rw_wrlock(&z->lock);
lock_rw_unlock(&zones->lock);
r = lz_enter_rr_into_zone(z, 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_rw_rdlock(&zones->lock);
z = local_zones_lookup(zones, name, len, labs, dclass);
if(!z) {
/* no such zone, we're done */
lock_rw_unlock(&zones->lock);
return;
}
lock_rw_wrlock(&z->lock);
lock_rw_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);
}
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