/*
* daemon/acl_list.h - client access control storage for the server.
*
* 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 keeps track of the list of clients that are allowed to
* access the server.
*/
#ifndef DAEMON_ACL_LIST_H
#define DAEMON_ACL_LIST_H
#include "util/storage/dnstree.h"
struct config_file;
struct regional;
/**
* Enumeration of access control options for an address range.
* Allow or deny access.
*/
enum acl_access {
/** disallow any access whatsoever, drop it */
acl_deny = 0,
/** disallow access, send a polite 'REFUSED' reply */
acl_refuse,
/** disallow any access to zones that aren't local, drop it */
acl_deny_non_local,
/** disallow access to zones that aren't local, 'REFUSED' reply */
acl_refuse_non_local,
/** allow full access for recursion (+RD) queries */
acl_allow,
/** allow full access for all queries, recursion and cache snooping */
acl_allow_snoop
};
/**
* Access control storage structure
*/
struct acl_list {
/** regional for allocation */
struct regional* region;
/**
* Tree of the addresses that are allowed/blocked.
* contents of type acl_addr.
*/
rbtree_t tree;
};
/**
*
* An address span with access control information
*/
struct acl_addr {
/** node in address tree */
struct addr_tree_node node;
/** access control on this netblock */
enum acl_access control;
};
/**
* Create acl structure
* @return new structure or NULL on error.
*/
struct acl_list* acl_list_create(void);
/**
* Delete acl structure.
* @param acl: to delete.
*/
void acl_list_delete(struct acl_list* acl);
/**
* Process access control config.
* @param acl: where to store.
* @param cfg: config options.
* @return 0 on error.
*/
int acl_list_apply_cfg(struct acl_list* acl, struct config_file* cfg);
/**
* Lookup address to see its access control status.
* @param acl: structure for address storage.
* @param addr: address to check
* @param addrlen: length of addr.
* @return: what to do with message from this address.
*/
enum acl_access acl_list_lookup(struct acl_list* acl,
struct sockaddr_storage* addr, socklen_t addrlen);
/**
* Get memory used by acl structure.
* @param acl: structure for address storage.
* @return bytes in use.
*/
size_t acl_list_get_mem(struct acl_list* acl);
#endif /* DAEMON_ACL_LIST_H */
