wownero/external/unbound/iterator/iter_hints.c
Erik de Castro Lopo a85b5759f3 Upgrade unbound library
These files were pulled from the 1.6.3 release tarball.

This new version builds against OpenSSL version 1.1 which will be
the default in the new Debian Stable which is due to be released
RealSoonNow (tm).
2017-06-17 23:04:00 +10:00

546 lines
15 KiB
C

/*
* 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 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 assist the iterator module.
* Keep track of stub and root hints, and read those from config.
*/
#include "config.h"
#include "iterator/iter_hints.h"
#include "iterator/iter_delegpt.h"
#include "util/log.h"
#include "util/config_file.h"
#include "util/net_help.h"
#include "util/data/dname.h"
#include "sldns/rrdef.h"
#include "sldns/str2wire.h"
#include "sldns/wire2str.h"
struct iter_hints*
hints_create(void)
{
struct iter_hints* hints = (struct iter_hints*)calloc(1,
sizeof(struct iter_hints));
if(!hints)
return NULL;
return hints;
}
static void hints_stub_free(struct iter_hints_stub* s)
{
if(!s) return;
delegpt_free_mlc(s->dp);
free(s);
}
static void delhintnode(rbnode_type* n, void* ATTR_UNUSED(arg))
{
struct iter_hints_stub* node = (struct iter_hints_stub*)n;
hints_stub_free(node);
}
static void hints_del_tree(struct iter_hints* hints)
{
traverse_postorder(&hints->tree, &delhintnode, NULL);
}
void
hints_delete(struct iter_hints* hints)
{
if(!hints)
return;
hints_del_tree(hints);
free(hints);
}
/** add hint to delegation hints */
static int
ah(struct delegpt* dp, const char* sv, const char* ip)
{
struct sockaddr_storage addr;
socklen_t addrlen;
size_t dname_len;
uint8_t* dname = sldns_str2wire_dname(sv, &dname_len);
if(!dname) {
log_err("could not parse %s", sv);
return 0;
}
if(!delegpt_add_ns_mlc(dp, dname, 0) ||
!extstrtoaddr(ip, &addr, &addrlen) ||
!delegpt_add_target_mlc(dp, dname, dname_len,
&addr, addrlen, 0, 0)) {
free(dname);
return 0;
}
free(dname);
return 1;
}
/** obtain compiletime provided root hints */
static struct delegpt*
compile_time_root_prime(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: changes-on-20120103
*/
struct delegpt* dp = delegpt_create_mlc((uint8_t*)"\000");
if(!dp)
return NULL;
dp->has_parent_side_NS = 1;
if(do_ip4) {
if(!ah(dp, "A.ROOT-SERVERS.NET.", "198.41.0.4")) goto failed;
if(!ah(dp, "B.ROOT-SERVERS.NET.", "192.228.79.201")) goto failed;
if(!ah(dp, "C.ROOT-SERVERS.NET.", "192.33.4.12")) goto failed;
if(!ah(dp, "D.ROOT-SERVERS.NET.", "199.7.91.13")) goto failed;
if(!ah(dp, "E.ROOT-SERVERS.NET.", "192.203.230.10")) goto failed;
if(!ah(dp, "F.ROOT-SERVERS.NET.", "192.5.5.241")) goto failed;
if(!ah(dp, "G.ROOT-SERVERS.NET.", "192.112.36.4")) goto failed;
if(!ah(dp, "H.ROOT-SERVERS.NET.", "198.97.190.53")) goto failed;
if(!ah(dp, "I.ROOT-SERVERS.NET.", "192.36.148.17")) goto failed;
if(!ah(dp, "J.ROOT-SERVERS.NET.", "192.58.128.30")) goto failed;
if(!ah(dp, "K.ROOT-SERVERS.NET.", "193.0.14.129")) goto failed;
if(!ah(dp, "L.ROOT-SERVERS.NET.", "199.7.83.42")) goto failed;
if(!ah(dp, "M.ROOT-SERVERS.NET.", "202.12.27.33")) goto failed;
}
if(do_ip6) {
if(!ah(dp, "A.ROOT-SERVERS.NET.", "2001:503:ba3e::2:30")) goto failed;
if(!ah(dp, "B.ROOT-SERVERS.NET.", "2001:500:84::b")) goto failed;
if(!ah(dp, "C.ROOT-SERVERS.NET.", "2001:500:2::c")) goto failed;
if(!ah(dp, "D.ROOT-SERVERS.NET.", "2001:500:2d::d")) goto failed;
if(!ah(dp, "E.ROOT-SERVERS.NET.", "2001:500:a8::e")) goto failed;
if(!ah(dp, "F.ROOT-SERVERS.NET.", "2001:500:2f::f")) goto failed;
if(!ah(dp, "G.ROOT-SERVERS.NET.", "2001:500:12::d0d")) goto failed;
if(!ah(dp, "H.ROOT-SERVERS.NET.", "2001:500:1::53")) goto failed;
if(!ah(dp, "I.ROOT-SERVERS.NET.", "2001:7fe::53")) goto failed;
if(!ah(dp, "J.ROOT-SERVERS.NET.", "2001:503:c27::2:30")) goto failed;
if(!ah(dp, "K.ROOT-SERVERS.NET.", "2001:7fd::1")) goto failed;
if(!ah(dp, "L.ROOT-SERVERS.NET.", "2001:500:9f::42")) goto failed;
if(!ah(dp, "M.ROOT-SERVERS.NET.", "2001:dc3::35")) goto failed;
}
return dp;
failed:
delegpt_free_mlc(dp);
return 0;
}
/** 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 = (struct iter_hints_stub*)malloc(
sizeof(struct iter_hints_stub));
if(!node) {
delegpt_free_mlc(dp);
return 0;
}
node->dp = dp;
node->noprime = (uint8_t)noprime;
if(!name_tree_insert(&hints->tree, &node->node, dp->name, dp->namelen,
dp->namelabs, c)) {
char buf[257];
dname_str(dp->name, buf);
log_err("second hints for zone %s ignored.", buf);
delegpt_free_mlc(dp);
free(node);
}
return 1;
}
/** set stub name */
static struct delegpt*
read_stubs_name(struct config_stub* s)
{
struct delegpt* dp;
size_t dname_len;
uint8_t* dname;
if(!s->name) {
log_err("stub zone without a name");
return NULL;
}
dname = sldns_str2wire_dname(s->name, &dname_len);
if(!dname) {
log_err("cannot parse stub zone name %s", s->name);
return NULL;
}
if(!(dp=delegpt_create_mlc(dname))) {
free(dname);
log_err("out of memory");
return NULL;
}
free(dname);
return dp;
}
/** set stub host names */
static int
read_stubs_host(struct config_stub* s, struct delegpt* dp)
{
struct config_strlist* p;
size_t dname_len;
uint8_t* dname;
for(p = s->hosts; p; p = p->next) {
log_assert(p->str);
dname = sldns_str2wire_dname(p->str, &dname_len);
if(!dname) {
log_err("cannot parse stub %s nameserver name: '%s'",
s->name, p->str);
return 0;
}
if(!delegpt_add_ns_mlc(dp, dname, 0)) {
free(dname);
log_err("out of memory");
return 0;
}
free(dname);
}
return 1;
}
/** set stub server addresses */
static int
read_stubs_addr(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_mlc(dp, &addr, addrlen, 0, 0)) {
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;
struct delegpt* dp;
for(s = cfg->stubs; s; s = s->next) {
if(!(dp=read_stubs_name(s)))
return 0;
if(!read_stubs_host(s, dp) || !read_stubs_addr(s, dp)) {
delegpt_free_mlc(dp);
return 0;
}
/* the flag is turned off for 'stub-first' so that the
* last resort will ask for parent-side NS record and thus
* fallback to the internet name servers on a failure */
dp->has_parent_side_NS = (uint8_t)!s->isfirst;
/* ssl_upstream */
dp->ssl_upstream = (uint8_t)s->ssl_upstream;
delegpt_log(VERB_QUERY, dp);
if(!hints_insert(hints, LDNS_RR_CLASS_IN, dp, !s->isprime))
return 0;
}
return 1;
}
/** read root hints from file */
static int
read_root_hints(struct iter_hints* hints, char* fname)
{
struct sldns_file_parse_state pstate;
struct delegpt* dp;
uint8_t rr[LDNS_RR_BUF_SIZE];
size_t rr_len, dname_len;
int 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_mlc(NULL);
if(!dp) {
log_err("out of memory reading root hints");
fclose(f);
return 0;
}
verbose(VERB_QUERY, "Reading root hints from %s", fname);
memset(&pstate, 0, sizeof(pstate));
pstate.lineno = 1;
dp->has_parent_side_NS = 1;
while(!feof(f)) {
rr_len = sizeof(rr);
dname_len = 0;
status = sldns_fp2wire_rr_buf(f, rr, &rr_len, &dname_len,
&pstate);
if(status != 0) {
log_err("reading root hints %s %d:%d: %s", fname,
pstate.lineno, LDNS_WIREPARSE_OFFSET(status),
sldns_get_errorstr_parse(status));
goto stop_read;
}
if(rr_len == 0)
continue; /* EMPTY line, TTL or ORIGIN */
if(sldns_wirerr_get_type(rr, rr_len, dname_len)
== LDNS_RR_TYPE_NS) {
if(!delegpt_add_ns_mlc(dp, sldns_wirerr_get_rdata(rr,
rr_len, dname_len), 0)) {
log_err("out of memory reading root hints");
goto stop_read;
}
c = sldns_wirerr_get_class(rr, rr_len, dname_len);
if(!dp->name) {
if(!delegpt_set_name_mlc(dp, rr)) {
log_err("out of memory.");
goto stop_read;
}
}
} else if(sldns_wirerr_get_type(rr, rr_len, dname_len)
== LDNS_RR_TYPE_A && sldns_wirerr_get_rdatalen(rr,
rr_len, dname_len) == INET_SIZE) {
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,
sldns_wirerr_get_rdata(rr, rr_len, dname_len),
INET_SIZE);
if(!delegpt_add_target_mlc(dp, rr, dname_len,
(struct sockaddr_storage*)&sa, len,
0, 0)) {
log_err("out of memory reading root hints");
goto stop_read;
}
} else if(sldns_wirerr_get_type(rr, rr_len, dname_len)
== LDNS_RR_TYPE_AAAA && sldns_wirerr_get_rdatalen(rr,
rr_len, dname_len) == INET6_SIZE) {
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,
sldns_wirerr_get_rdata(rr, rr_len, dname_len),
INET6_SIZE);
if(!delegpt_add_target_mlc(dp, rr, dname_len,
(struct sockaddr_storage*)&sa, len,
0, 0)) {
log_err("out of memory reading root hints");
goto stop_read;
}
} else {
char buf[17];
sldns_wire2str_type_buf(sldns_wirerr_get_type(rr,
rr_len, dname_len), buf, sizeof(buf));
log_warn("root hints %s:%d skipping type %s",
fname, pstate.lineno, buf);
}
}
fclose(f);
if(!dp->name) {
log_warn("root hints %s: no NS content", fname);
delegpt_free_mlc(dp);
return 1;
}
if(!hints_insert(hints, c, dp, 0)) {
return 0;
}
delegpt_log(VERB_QUERY, dp);
return 1;
stop_read:
delegpt_free_mlc(dp);
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)
{
hints_del_tree(hints);
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(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 there is no cache (root prime situation) */
if(cache_dp == NULL) {
if(r->dp->namelabs != 1)
return r; /* no cache dp, use any non-root stub */
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)
{
size_t s;
struct iter_hints_stub* p;
if(!hints) return 0;
s = sizeof(*hints);
RBTREE_FOR(p, struct iter_hints_stub*, &hints->tree) {
s += sizeof(*p) + delegpt_get_mem(p->dp);
}
return s;
}
int
hints_add_stub(struct iter_hints* hints, uint16_t c, struct delegpt* dp,
int noprime)
{
struct iter_hints_stub *z;
if((z=(struct iter_hints_stub*)name_tree_find(&hints->tree,
dp->name, dp->namelen, dp->namelabs, c)) != NULL) {
(void)rbtree_delete(&hints->tree, &z->node);
hints_stub_free(z);
}
if(!hints_insert(hints, c, dp, noprime))
return 0;
name_tree_init_parents(&hints->tree);
return 1;
}
void
hints_delete_stub(struct iter_hints* hints, uint16_t c, uint8_t* nm)
{
struct iter_hints_stub *z;
size_t len;
int labs = dname_count_size_labels(nm, &len);
if(!(z=(struct iter_hints_stub*)name_tree_find(&hints->tree,
nm, len, labs, c)))
return; /* nothing to do */
(void)rbtree_delete(&hints->tree, &z->node);
hints_stub_free(z);
name_tree_init_parents(&hints->tree);
}