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/*
* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
*
* SPDX-License-Identifier: MPL-2.0
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, you can obtain one at https://mozilla.org/MPL/2.0/.
*
* See the COPYRIGHT file distributed with this work for additional
* information regarding copyright ownership.
*/
/*! \file */
#include <isc/mem.h>
#include <isc/result.h>
#include <isc/util.h>
#include <dns/acl.h>
#include <dns/message.h>
#include <ns/server.h>
#include <ns/sortlist.h>
ns_sortlisttype_t
ns_sortlist_setup(dns_acl_t *acl, dns_aclenv_t *env, isc_netaddr_t *clientaddr,
void **argp) {
if (acl == NULL) {
goto dont_sort;
}
for (size_t i = 0; i < acl->length; i++) {
/*
* 'e' refers to the current 'top level statement'
* in the sortlist (see ARM).
*/
dns_aclelement_t *e = &acl->elements[i];
dns_aclelement_t *try_elt;
dns_aclelement_t *order_elt = NULL;
dns_aclelement_t *matched_elt = NULL;
if (e->type == dns_aclelementtype_nestedacl) {
dns_acl_t *inner = e->nestedacl;
if (inner->length == 0) {
try_elt = e;
} else if (inner->length > 2) {
goto dont_sort;
} else if (inner->elements[0].negative) {
goto dont_sort;
} else {
try_elt = &inner->elements[0];
if (inner->length == 2) {
order_elt = &inner->elements[1];
}
}
} else {
/*
* BIND 8 allows bare elements at the top level
* as an undocumented feature.
*/
try_elt = e;
}
if (!dns_aclelement_match(
clientaddr, NULL, try_elt, env,
(const dns_aclelement_t **)&matched_elt))
{
continue;
}
if (order_elt == NULL) {
INSIST(matched_elt != NULL);
*argp = matched_elt;
return (NS_SORTLISTTYPE_1ELEMENT);
}
if (order_elt->type == dns_aclelementtype_nestedacl) {
dns_acl_t *inner = NULL;
dns_acl_attach(order_elt->nestedacl, &inner);
*argp = inner;
return (NS_SORTLISTTYPE_2ELEMENT);
}
if (order_elt->type == dns_aclelementtype_localhost) {
dns_acl_t *inner = NULL;
RWLOCK(&env->rwlock, isc_rwlocktype_read);
if (env->localhost != NULL) {
dns_acl_attach(env->localhost, &inner);
}
RWUNLOCK(&env->rwlock, isc_rwlocktype_read);
if (inner != NULL) {
*argp = inner;
return (NS_SORTLISTTYPE_2ELEMENT);
}
}
if (order_elt->type == dns_aclelementtype_localnets) {
dns_acl_t *inner = NULL;
RWLOCK(&env->rwlock, isc_rwlocktype_read);
if (env->localnets != NULL) {
dns_acl_attach(env->localnets, &inner);
}
RWUNLOCK(&env->rwlock, isc_rwlocktype_read);
if (inner != NULL) {
*argp = inner;
return (NS_SORTLISTTYPE_2ELEMENT);
}
}
/*
* BIND 8 allows a bare IP prefix as
* the 2nd element of a 2-element
* sortlist statement.
*/
*argp = order_elt;
return (NS_SORTLISTTYPE_1ELEMENT);
}
dont_sort:
*argp = NULL;
return (NS_SORTLISTTYPE_NONE);
}
int
ns_sortlist_addrorder2(const isc_netaddr_t *addr, const void *arg) {
const dns_sortlist_arg_t *sla = (const dns_sortlist_arg_t *)arg;
dns_aclenv_t *env = sla->env;
const dns_acl_t *sortacl = sla->acl;
int match;
(void)dns_acl_match(addr, NULL, sortacl, env, &match, NULL);
if (match > 0) {
return (match);
} else if (match < 0) {
return (INT_MAX - (-match));
} else {
return (INT_MAX / 2);
}
}
int
ns_sortlist_addrorder1(const isc_netaddr_t *addr, const void *arg) {
const dns_sortlist_arg_t *sla = (const dns_sortlist_arg_t *)arg;
dns_aclenv_t *env = sla->env;
const dns_aclelement_t *element = sla->element;
if (dns_aclelement_match(addr, NULL, element, env, NULL)) {
return (0);
}
return (INT_MAX);
}
void
ns_sortlist_byaddrsetup(dns_acl_t *sortlist_acl, dns_aclenv_t *env,
isc_netaddr_t *client_addr,
dns_addressorderfunc_t *orderp, void **argp) {
ns_sortlisttype_t sortlisttype;
sortlisttype = ns_sortlist_setup(sortlist_acl, env, client_addr, argp);
switch (sortlisttype) {
case NS_SORTLISTTYPE_1ELEMENT:
*orderp = ns_sortlist_addrorder1;
break;
case NS_SORTLISTTYPE_2ELEMENT:
*orderp = ns_sortlist_addrorder2;
break;
case NS_SORTLISTTYPE_NONE:
*orderp = NULL;
break;
default:
UNEXPECTED_ERROR(
"unexpected return from ns_sortlist_setup(): %d",
sortlisttype);
break;
}
}
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