iter_priv.h revision 356345 
1/*
2 * iterator/iter_priv.h - iterative resolver private address and domain store
3 *
4 * Copyright (c) 2008, NLnet Labs. All rights reserved.
5 *
6 * This software is open source.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * Redistributions of source code must retain the above copyright notice,
13 * this list of conditions and the following disclaimer.
14 *
15 * Redistributions in binary form must reproduce the above copyright notice,
16 * this list of conditions and the following disclaimer in the documentation
17 * and/or other materials provided with the distribution.
18 *
19 * Neither the name of the NLNET LABS nor the names of its contributors may
20 * be used to endorse or promote products derived from this software without
21 * specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
24 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
25 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
26 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
27 * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
28 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
29 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
30 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 */
35
36/**
37 * \file
38 *
39 * This file contains functions to assist the iterator module.
40 * Keep track of the private addresses and lookup fast.
41 */
42
43#ifndef ITERATOR_ITER_PRIV_H
44#define ITERATOR_ITER_PRIV_H
45#include "util/rbtree.h"
46struct sldns_buffer;
47struct iter_env;
48struct config_file;
49struct regional;
50struct rrset_parse;
51
52/**
53 * Iterator priv structure
54 */
55struct iter_priv {
56	/** regional for allocation */
57	struct regional* region;
58	/**
59	 * Tree of the address spans that are blocked.
60	 * contents of type addr_tree_node.
61	 * No further data need, only presence or absence.
62	 */
63	rbtree_type a;
64	/**
65	 * Tree of the domains spans that are allowed to contain
66	 * the blocked address spans.
67	 * contents of type name_tree_node.
68	 * No further data need, only presence or absence.
69	 */
70	rbtree_type n;
71};
72
73/**
74 * Create priv structure
75 * @return new structure or NULL on error.
76 */
77struct iter_priv* priv_create(void);
78
79/**
80 * Delete priv structure.
81 * @param priv: to delete.
82 */
83void priv_delete(struct iter_priv* priv);
84
85/**
86 * Process priv config.
87 * @param priv: where to store.
88 * @param cfg: config options.
89 * @return 0 on error.
90 */
91int priv_apply_cfg(struct iter_priv* priv, struct config_file* cfg);
92
93/**
94 * See if rrset is bad.
95 * Will remove individual RRs that are bad (if possible) to
96 * sanitize the RRset without removing it completely.
97 * @param priv: structure for private address storage.
98 * @param pkt: packet to decompress rrset name in.
99 * @param rrset: the rrset to examine, A or AAAA.
100 * @return true if the rrset is bad and should be removed.
101 */
102int priv_rrset_bad(struct iter_priv* priv, struct sldns_buffer* pkt,
103	struct rrset_parse* rrset);
104
105/**
106 * Get memory used by priv structure.
107 * @param priv: structure for address storage.
108 * @return bytes in use.
109 */
110size_t priv_get_mem(struct iter_priv* priv);
111
112#endif /* ITERATOR_ITER_PRIV_H */
113