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/*
* iterator/iter_hints.c - iterative resolver module stub and root hints.
*
* 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 assist the iterator module.
* Keep track of stub and root hints, and read those from config.
*/
#include "config.h"
#include "ldns/dname.h"
#include "ldns/rr.h"
#include "iterator/iter_hints.h"
#include "iterator/iter_delegpt.h"
#include "util/regional.h"
#include "util/log.h"
#include "util/config_file.h"
#include "util/net_help.h"
#include "util/data/dname.h"
struct iter_hints*
hints_create(void)
{
struct iter_hints* hints = (struct iter_hints*)calloc(1,
sizeof(struct iter_hints));
if(!hints)
return NULL;
hints->region = regional_create();
if(!hints->region) {
hints_delete(hints);
return NULL;
}
return hints;
}
void
hints_delete(struct iter_hints* hints)
{
if(!hints)
return;
regional_destroy(hints->region);
free(hints);
}
/** add hint to delegation hints */
static int
ah(struct delegpt* dp, struct regional* r, const char* sv, const char* ip)
{
struct sockaddr_storage addr;
socklen_t addrlen;
ldns_rdf* rdf = ldns_dname_new_frm_str(sv);
if(!rdf) {
log_err("could not parse %s", sv);
return 0;
}
if(!delegpt_add_ns(dp, r, ldns_rdf_data(rdf), 0) ||
!extstrtoaddr(ip, &addr, &addrlen) ||
!delegpt_add_target(dp, r, ldns_rdf_data(rdf), ldns_rdf_size(rdf),
&addr, addrlen, 0, 0, 1)) {
ldns_rdf_deep_free(rdf);
return 0;
}
ldns_rdf_deep_free(rdf);
return 1;
}
/** obtain compiletime provided root hints */
static struct delegpt*
compile_time_root_prime(struct regional* r, int do_ip4, int do_ip6)
{
/* from:
; This file is made available by InterNIC
; under anonymous FTP as
; file /domain/named.cache
; on server FTP.INTERNIC.NET
; -OR- RS.INTERNIC.NET
;
; related version of root zone: 2010061700
*/
struct delegpt* dp = delegpt_create(r);
if(!dp)
return NULL;
dp->has_parent_side_NS = 1;
if(!delegpt_set_name(dp, r, (uint8_t*)"\000"))
return NULL;
if(do_ip4) {
if(!ah(dp, r, "A.ROOT-SERVERS.NET.", "198.41.0.4")) return 0;
if(!ah(dp, r, "B.ROOT-SERVERS.NET.", "192.228.79.201")) return 0;
if(!ah(dp, r, "C.ROOT-SERVERS.NET.", "192.33.4.12")) return 0;
if(!ah(dp, r, "D.ROOT-SERVERS.NET.", "128.8.10.90")) return 0;
if(!ah(dp, r, "E.ROOT-SERVERS.NET.", "192.203.230.10")) return 0;
if(!ah(dp, r, "F.ROOT-SERVERS.NET.", "192.5.5.241")) return 0;
if(!ah(dp, r, "G.ROOT-SERVERS.NET.", "192.112.36.4")) return 0;
if(!ah(dp, r, "H.ROOT-SERVERS.NET.", "128.63.2.53")) return 0;
if(!ah(dp, r, "I.ROOT-SERVERS.NET.", "192.36.148.17")) return 0;
if(!ah(dp, r, "J.ROOT-SERVERS.NET.", "192.58.128.30")) return 0;
if(!ah(dp, r, "K.ROOT-SERVERS.NET.", "193.0.14.129")) return 0;
if(!ah(dp, r, "L.ROOT-SERVERS.NET.", "199.7.83.42")) return 0;
if(!ah(dp, r, "M.ROOT-SERVERS.NET.", "202.12.27.33")) return 0;
}
if(do_ip6) {
if(!ah(dp, r, "A.ROOT-SERVERS.NET.", "2001:503:ba3e::2:30")) return 0;
if(!ah(dp, r, "F.ROOT-SERVERS.NET.", "2001:500:2f::f")) return 0;
if(!ah(dp, r, "H.ROOT-SERVERS.NET.", "2001:500:1::803f:235")) return 0;
if(!ah(dp, r, "I.ROOT-SERVERS.NET.", "2001:7fe::53")) return 0;
if(!ah(dp, r, "J.ROOT-SERVERS.NET.", "2001:503:c27::2:30")) return 0;
if(!ah(dp, r, "K.ROOT-SERVERS.NET.", "2001:7fd::1")) return 0;
if(!ah(dp, r, "L.ROOT-SERVERS.NET.", "2001:500:3::42")) return 0;
if(!ah(dp, r, "M.ROOT-SERVERS.NET.", "2001:dc3::35")) return 0;
}
return dp;
}
/** insert new hint info into hint structure */
static int
hints_insert(struct iter_hints* hints, uint16_t c, struct delegpt* dp,
int noprime)
{
struct iter_hints_stub* node = regional_alloc(hints->region,
sizeof(struct iter_hints_stub));
uint8_t* nm;
if(!node)
return 0;
nm = regional_alloc_init(hints->region, dp->name, dp->namelen);
if(!nm)
return 0;
node->dp = dp;
node->noprime = (uint8_t)noprime;
if(!name_tree_insert(&hints->tree, &node->node, nm, dp->namelen,
dp->namelabs, c)) {
log_err("second hints ignored.");
}
return 1;
}
/** set stub name */
static int
read_stubs_name(struct iter_hints* hints, struct config_stub* s,
struct delegpt* dp)
{
ldns_rdf* rdf;
if(!s->name) {
log_err("stub zone without a name");
return 0;
}
rdf = ldns_dname_new_frm_str(s->name);
if(!rdf) {
log_err("cannot parse stub zone name %s", s->name);
return 0;
}
if(!delegpt_set_name(dp, hints->region, ldns_rdf_data(rdf))) {
ldns_rdf_deep_free(rdf);
log_err("out of memory");
return 0;
}
ldns_rdf_deep_free(rdf);
return 1;
}
/** set stub host names */
static int
read_stubs_host(struct iter_hints* hints, struct config_stub* s,
struct delegpt* dp)
{
struct config_strlist* p;
ldns_rdf* rdf;
for(p = s->hosts; p; p = p->next) {
log_assert(p->str);
rdf = ldns_dname_new_frm_str(p->str);
if(!rdf) {
log_err("cannot parse stub %s nameserver name: '%s'",
s->name, p->str);
return 0;
}
if(!delegpt_add_ns(dp, hints->region, ldns_rdf_data(rdf), 0)) {
ldns_rdf_deep_free(rdf);
log_err("out of memory");
return 0;
}
ldns_rdf_deep_free(rdf);
}
return 1;
}
/** set stub server addresses */
static int
read_stubs_addr(struct iter_hints* hints, struct config_stub* s,
struct delegpt* dp)
{
struct config_strlist* p;
struct sockaddr_storage addr;
socklen_t addrlen;
for(p = s->addrs; p; p = p->next) {
log_assert(p->str);
if(!extstrtoaddr(p->str, &addr, &addrlen)) {
log_err("cannot parse stub %s ip address: '%s'",
s->name, p->str);
return 0;
}
if(!delegpt_add_addr(dp, hints->region, &addr, addrlen,
0, 0, 1)) {
log_err("out of memory");
return 0;
}
}
return 1;
}
/** read stubs config */
static int
read_stubs(struct iter_hints* hints, struct config_file* cfg)
{
struct config_stub* s;
for(s = cfg->stubs; s; s = s->next) {
struct delegpt* dp = delegpt_create(hints->region);
if(!dp) {
log_err("out of memory");
return 0;
}
dp->has_parent_side_NS = 1;
if(!read_stubs_name(hints, s, dp) ||
!read_stubs_host(hints, s, dp) ||
!read_stubs_addr(hints, s, dp))
return 0;
if(!hints_insert(hints, LDNS_RR_CLASS_IN, dp, !s->isprime))
return 0;
delegpt_log(VERB_QUERY, dp);
}
return 1;
}
/** read root hints from file */
static int
read_root_hints(struct iter_hints* hints, char* fname)
{
int lineno = 0;
uint32_t default_ttl = 0;
ldns_rdf* origin = NULL;
ldns_rdf* prev_rr = NULL;
struct delegpt* dp;
ldns_rr* rr = NULL;
ldns_status status;
uint16_t c = LDNS_RR_CLASS_IN;
FILE* f = fopen(fname, "r");
if(!f) {
log_err("could not read root hints %s: %s",
fname, strerror(errno));
return 0;
}
dp = delegpt_create(hints->region);
if(!dp) {
log_err("out of memory reading root hints");
fclose(f);
return 0;
}
verbose(VERB_QUERY, "Reading root hints from %s", fname);
dp->has_parent_side_NS = 1;
while(!feof(f)) {
status = ldns_rr_new_frm_fp_l(&rr, f,
&default_ttl, &origin, &prev_rr, &lineno);
if(status == LDNS_STATUS_SYNTAX_EMPTY ||
status == LDNS_STATUS_SYNTAX_TTL ||
status == LDNS_STATUS_SYNTAX_ORIGIN)
continue;
if(status != LDNS_STATUS_OK) {
log_err("reading root hints %s %d: %s", fname,
lineno, ldns_get_errorstr_by_id(status));
goto stop_read;
}
if(ldns_rr_get_type(rr) == LDNS_RR_TYPE_NS) {
if(!delegpt_add_ns(dp, hints->region,
ldns_rdf_data(ldns_rr_rdf(rr, 0)), 0)) {
log_err("out of memory reading root hints");
goto stop_read;
}
c = ldns_rr_get_class(rr);
if(!dp->name) {
if(!delegpt_set_name(dp, hints->region,
ldns_rdf_data(ldns_rr_owner(rr)))){
log_err("out of memory.");
goto stop_read;
}
}
} else if(ldns_rr_get_type(rr) == LDNS_RR_TYPE_A) {
struct sockaddr_in sa;
socklen_t len = (socklen_t)sizeof(sa);
memset(&sa, 0, len);
sa.sin_family = AF_INET;
sa.sin_port = (in_port_t)htons(UNBOUND_DNS_PORT);
memmove(&sa.sin_addr,
ldns_rdf_data(ldns_rr_rdf(rr, 0)), INET_SIZE);
if(!delegpt_add_target(dp, hints->region,
ldns_rdf_data(ldns_rr_owner(rr)),
ldns_rdf_size(ldns_rr_owner(rr)),
(struct sockaddr_storage*)&sa, len,
0, 0, 1)) {
log_err("out of memory reading root hints");
goto stop_read;
}
} else if(ldns_rr_get_type(rr) == LDNS_RR_TYPE_AAAA) {
struct sockaddr_in6 sa;
socklen_t len = (socklen_t)sizeof(sa);
memset(&sa, 0, len);
sa.sin6_family = AF_INET6;
sa.sin6_port = (in_port_t)htons(UNBOUND_DNS_PORT);
memmove(&sa.sin6_addr,
ldns_rdf_data(ldns_rr_rdf(rr, 0)), INET6_SIZE);
if(!delegpt_add_target(dp, hints->region,
ldns_rdf_data(ldns_rr_owner(rr)),
ldns_rdf_size(ldns_rr_owner(rr)),
(struct sockaddr_storage*)&sa, len,
0, 0, 1)) {
log_err("out of memory reading root hints");
goto stop_read;
}
} else {
log_warn("root hints %s:%d skipping type %d",
fname, lineno, ldns_rr_get_type(rr));
}
ldns_rr_free(rr);
}
if (origin)
ldns_rdf_deep_free(origin);
if (prev_rr)
ldns_rdf_deep_free(prev_rr);
fclose(f);
if(!dp->name) {
log_warn("root hints %s: no NS content", fname);
return 1;
}
if(!hints_insert(hints, c, dp, 0)) {
return 0;
}
delegpt_log(VERB_QUERY, dp);
return 1;
stop_read:
if (origin)
ldns_rdf_deep_free(origin);
if (prev_rr)
ldns_rdf_deep_free(prev_rr);
fclose(f);
return 0;
}
/** read root hints list */
static int
read_root_hints_list(struct iter_hints* hints, struct config_file* cfg)
{
struct config_strlist* p;
for(p = cfg->root_hints; p; p = p->next) {
log_assert(p->str);
if(p->str && p->str[0]) {
char* f = p->str;
if(cfg->chrootdir && cfg->chrootdir[0] &&
strncmp(p->str, cfg->chrootdir,
strlen(cfg->chrootdir)) == 0)
f += strlen(cfg->chrootdir);
if(!read_root_hints(hints, f))
return 0;
}
}
return 1;
}
int
hints_apply_cfg(struct iter_hints* hints, struct config_file* cfg)
{
regional_free_all(hints->region);
name_tree_init(&hints->tree);
/* read root hints */
if(!read_root_hints_list(hints, cfg))
return 0;
/* read stub hints */
if(!read_stubs(hints, cfg))
return 0;
/* use fallback compiletime root hints */
if(!hints_lookup_root(hints, LDNS_RR_CLASS_IN)) {
struct delegpt* dp = compile_time_root_prime(hints->region,
cfg->do_ip4, cfg->do_ip6);
verbose(VERB_ALGO, "no config, using builtin root hints.");
if(!dp)
return 0;
if(!hints_insert(hints, LDNS_RR_CLASS_IN, dp, 0))
return 0;
}
name_tree_init_parents(&hints->tree);
return 1;
}
struct delegpt*
hints_lookup_root(struct iter_hints* hints, uint16_t qclass)
{
uint8_t rootlab = 0;
struct iter_hints_stub *stub;
stub = (struct iter_hints_stub*)name_tree_find(&hints->tree,
&rootlab, 1, 1, qclass);
if(!stub)
return NULL;
return stub->dp;
}
struct iter_hints_stub*
hints_lookup_stub(struct iter_hints* hints, uint8_t* qname,
uint16_t qclass, struct delegpt* cache_dp)
{
size_t len;
int labs;
struct iter_hints_stub *r;
/* first lookup the stub */
labs = dname_count_size_labels(qname, &len);
r = (struct iter_hints_stub*)name_tree_lookup(&hints->tree, qname,
len, labs, qclass);
if(!r) return NULL;
/*
* If the stub is same as the delegation we got
* And has noprime set, we need to 'prime' to use this stub instead.
*/
if(r->noprime && query_dname_compare(cache_dp->name, r->dp->name)==0)
return r; /* use this stub instead of cached dp */
/*
* If our cached delegation point is above the hint, we need to prime.
*/
if(dname_strict_subdomain(r->dp->name, r->dp->namelabs,
cache_dp->name, cache_dp->namelabs))
return r; /* need to prime this stub */
return NULL;
}
int hints_next_root(struct iter_hints* hints, uint16_t* qclass)
{
return name_tree_next_root(&hints->tree, qclass);
}
size_t
hints_get_mem(struct iter_hints* hints)
{
if(!hints) return 0;
return sizeof(*hints) + regional_get_mem(hints->region);
}
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