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126 lines
3.6 KiB
C
126 lines
3.6 KiB
C
/*
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* daemon/acl_list.h - client access control storage for the server.
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*
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* Copyright (c) 2007, NLnet Labs. All rights reserved.
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*
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* This software is open source.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* Neither the name of the NLNET LABS nor the names of its contributors may
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* be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* \file
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*
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* This file keeps track of the list of clients that are allowed to
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* access the server.
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*/
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#ifndef DAEMON_ACL_LIST_H
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#define DAEMON_ACL_LIST_H
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#include "util/storage/dnstree.h"
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struct config_file;
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struct regional;
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/**
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* Enumeration of access control options for an address range.
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* Allow or deny access.
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*/
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enum acl_access {
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/** disallow any access whatsoever, drop it */
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acl_deny = 0,
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/** disallow access, send a polite 'REFUSED' reply */
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acl_refuse,
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/** allow full access for recursion (+RD) queries */
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acl_allow,
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/** allow full access for all queries, recursion and cache snooping */
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acl_allow_snoop
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};
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/**
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* Access control storage structure
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*/
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struct acl_list {
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/** regional for allocation */
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struct regional* region;
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/**
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* Tree of the addresses that are allowed/blocked.
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* contents of type acl_addr.
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*/
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rbtree_t tree;
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};
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/**
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*
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* An address span with access control information
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*/
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struct acl_addr {
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/** node in address tree */
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struct addr_tree_node node;
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/** access control on this netblock */
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enum acl_access control;
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};
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/**
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* Create acl structure
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* @return new structure or NULL on error.
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*/
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struct acl_list* acl_list_create(void);
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/**
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* Delete acl structure.
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* @param acl: to delete.
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*/
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void acl_list_delete(struct acl_list* acl);
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/**
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* Process access control config.
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* @param acl: where to store.
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* @param cfg: config options.
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* @return 0 on error.
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*/
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int acl_list_apply_cfg(struct acl_list* acl, struct config_file* cfg);
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/**
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* Lookup address to see its access control status.
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* @param acl: structure for address storage.
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* @param addr: address to check
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* @param addrlen: length of addr.
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* @return: what to do with message from this address.
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*/
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enum acl_access acl_list_lookup(struct acl_list* acl,
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struct sockaddr_storage* addr, socklen_t addrlen);
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/**
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* Get memory used by acl structure.
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* @param acl: structure for address storage.
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* @return bytes in use.
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*/
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size_t acl_list_get_mem(struct acl_list* acl);
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#endif /* DAEMON_ACL_LIST_H */
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