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/*
* Copyright (C) 2004-2007 Internet Systems Consortium, Inc. ("ISC")
* Copyright (C) 2000, 2001 Internet Software Consortium.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
/* $Id: sortlist.h,v 1.11 2007/06/19 23:46:59 tbox Exp $ */
#ifndef NAMED_SORTLIST_H
#define NAMED_SORTLIST_H 1
/*! \file */
#include <isc/types.h>
#include <dns/types.h>
/*%
* Type for callback functions that rank addresses.
*/
typedef int
(*dns_addressorderfunc_t)(const isc_netaddr_t *address, const void *arg);
/*%
* Return value type for setup_sortlist.
*/
typedef enum {
NS_SORTLISTTYPE_NONE,
NS_SORTLISTTYPE_1ELEMENT,
NS_SORTLISTTYPE_2ELEMENT
} ns_sortlisttype_t;
ns_sortlisttype_t
ns_sortlist_setup(dns_acl_t *acl, isc_netaddr_t *clientaddr,
const void **argp);
/*%<
* Find the sortlist statement in 'acl' that applies to 'clientaddr', if any.
*
* If a 1-element sortlist item applies, return NS_SORTLISTTYPE_1ELEMENT and
* make '*argp' point to the matching subelement.
*
* If a 2-element sortlist item applies, return NS_SORTLISTTYPE_2ELEMENT and
* make '*argp' point to ACL that forms the second element.
*
* If no sortlist item applies, return NS_SORTLISTTYPE_NONE and set '*argp'
* to NULL.
*/
int
ns_sortlist_addrorder1(const isc_netaddr_t *addr, const void *arg);
/*%<
* Find the sort order of 'addr' in 'arg', the matching element
* of a 1-element top-level sortlist statement.
*/
int
ns_sortlist_addrorder2(const isc_netaddr_t *addr, const void *arg);
/*%<
* Find the sort order of 'addr' in 'arg', a topology-like
* ACL forming the second element in a 2-element top-level
* sortlist statement.
*/
void
ns_sortlist_byaddrsetup(dns_acl_t *sortlist_acl, isc_netaddr_t *client_addr,
dns_addressorderfunc_t *orderp,
const void **argp);
/*%<
* Find the sortlist statement in 'acl' that applies to 'clientaddr', if any.
* If a sortlist statement applies, return in '*orderp' a pointer to a function
* for ranking network addresses based on that sortlist statement, and in
* '*argp' an argument to pass to said function. If no sortlist statement
* applies, set '*orderp' and '*argp' to NULL.
*/
#endif /* NAMED_SORTLIST_H */
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