diff options
Diffstat (limited to 'bin/named/sortlist.c')
| -rw-r--r-- | bin/named/sortlist.c | 164 |
1 files changed, 164 insertions, 0 deletions
diff --git a/bin/named/sortlist.c b/bin/named/sortlist.c new file mode 100644 index 0000000..20a131c --- /dev/null +++ b/bin/named/sortlist.c @@ -0,0 +1,164 @@ +/* + * Copyright (C) Internet Systems Consortium, Inc. ("ISC") + * + * 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 http://mozilla.org/MPL/2.0/. + * + * See the COPYRIGHT file distributed with this work for additional + * information regarding copyright ownership. + */ + +/* $Id: sortlist.c,v 1.17 2007/09/14 01:46:05 marka Exp $ */ + +/*! \file */ + +#include <config.h> + +#include <isc/mem.h> +#include <isc/util.h> + +#include <dns/acl.h> +#include <dns/result.h> + +#include <named/globals.h> +#include <named/server.h> +#include <named/sortlist.h> + +ns_sortlisttype_t +ns_sortlist_setup(dns_acl_t *acl, isc_netaddr_t *clientaddr, + const void **argp) +{ + unsigned int i; + + if (acl == NULL) + goto dont_sort; + + for (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; + const 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, + &ns_g_server->aclenv, + &matched_elt)) { + if (order_elt != NULL) { + if (order_elt->type == + dns_aclelementtype_nestedacl) { + *argp = order_elt->nestedacl; + return (NS_SORTLISTTYPE_2ELEMENT); + } else if (order_elt->type == + dns_aclelementtype_localhost && + ns_g_server->aclenv.localhost != NULL) { + *argp = ns_g_server->aclenv.localhost; + return (NS_SORTLISTTYPE_2ELEMENT); + } else if (order_elt->type == + dns_aclelementtype_localnets && + ns_g_server->aclenv.localnets != NULL) { + *argp = ns_g_server->aclenv.localnets; + return (NS_SORTLISTTYPE_2ELEMENT); + } else { + /* + * BIND 8 allows a bare IP prefix as + * the 2nd element of a 2-element + * sortlist statement. + */ + *argp = order_elt; + return (NS_SORTLISTTYPE_1ELEMENT); + } + } else { + INSIST(matched_elt != NULL); + *argp = matched_elt; + return (NS_SORTLISTTYPE_1ELEMENT); + } + } + } + + /* No match; don't sort. */ + dont_sort: + *argp = NULL; + return (NS_SORTLISTTYPE_NONE); +} + +int +ns_sortlist_addrorder2(const isc_netaddr_t *addr, const void *arg) { + const dns_acl_t *sortacl = (const dns_acl_t *) arg; + int match; + + (void)dns_acl_match(addr, NULL, sortacl, + &ns_g_server->aclenv, + &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_aclelement_t *matchelt = (const dns_aclelement_t *) arg; + if (dns_aclelement_match(addr, NULL, matchelt, + &ns_g_server->aclenv, + NULL)) { + return (0); + } else { + return (INT_MAX); + } +} + +void +ns_sortlist_byaddrsetup(dns_acl_t *sortlist_acl, isc_netaddr_t *client_addr, + dns_addressorderfunc_t *orderp, + const void **argp) +{ + ns_sortlisttype_t sortlisttype; + + sortlisttype = ns_sortlist_setup(sortlist_acl, 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(__FILE__, __LINE__, + "unexpected return from ns_sortlist_setup(): " + "%d", sortlisttype); + break; + } +} + |