192 lines
6 KiB
C
192 lines
6 KiB
C
/*
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* util/storage/dnstree.h - support for rbtree types suitable for DNS code.
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*
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* Copyright (c) 2008, 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
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE 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 contains structures combining types and functions to
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* manipulate those structures that help building DNS lookup trees.
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*/
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#ifndef UTIL_STORAGE_DNSTREE_H
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#define UTIL_STORAGE_DNSTREE_H
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#include "util/rbtree.h"
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/**
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* Tree of domain names. Sorted first by class then by name.
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* This is not sorted canonically, but fast.
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* This can be looked up to obtain a closest encloser parent name.
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*
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* The tree itself is a rbtree_t.
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* This is the element node put as first entry in the client structure.
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*/
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struct name_tree_node {
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/** rbtree node, key is this struct : dclass and name */
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rbnode_t node;
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/** parent in tree */
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struct name_tree_node* parent;
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/** name in uncompressed wireformat */
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uint8_t* name;
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/** length of name */
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size_t len;
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/** labels in name */
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int labs;
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/** the class of the name (host order) */
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uint16_t dclass;
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};
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/**
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* Tree of IP addresses. Sorted first by protocol, then by bits.
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* This can be looked up to obtain the enclosing subnet.
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*
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* The tree itself is a rbtree_t.
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* This is the element node put as first entry in the client structure.
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*/
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struct addr_tree_node {
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/** rbtree node, key is this struct : proto and subnet */
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rbnode_t node;
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/** parent in tree */
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struct addr_tree_node* parent;
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/** address */
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struct sockaddr_storage addr;
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/** length of addr */
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socklen_t addrlen;
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/** netblock size */
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int net;
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};
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/**
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* Init a name tree to be empty
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* @param tree: to init.
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*/
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void name_tree_init(rbtree_t* tree);
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/**
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* insert element into name tree.
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* @param tree: name tree
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* @param node: node element (at start of a structure that caller
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* has allocated).
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* @param name: name to insert (wireformat)
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* this node has been allocated by the caller and it itself inserted.
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* @param len: length of name
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* @param labs: labels in name
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* @param dclass: class of name
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* @return false on error (duplicate element).
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*/
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int name_tree_insert(rbtree_t* tree, struct name_tree_node* node,
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uint8_t* name, size_t len, int labs, uint16_t dclass);
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/**
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* Initialize parent pointers in name tree.
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* Should be performed after insertions are done, before lookups
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* @param tree: name tree
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*/
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void name_tree_init_parents(rbtree_t* tree);
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/**
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* Lookup exact match in name tree
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* @param tree: name tree
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* @param name: wireformat name
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* @param len: length of name
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* @param labs: labels in name
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* @param dclass: class of name
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* @return node or NULL if not found.
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*/
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struct name_tree_node* name_tree_find(rbtree_t* tree, uint8_t* name,
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size_t len, int labs, uint16_t dclass);
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/**
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* Lookup closest encloser in name tree.
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* @param tree: name tree
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* @param name: wireformat name
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* @param len: length of name
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* @param labs: labels in name
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* @param dclass: class of name
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* @return closest enclosing node (could be equal) or NULL if not found.
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*/
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struct name_tree_node* name_tree_lookup(rbtree_t* tree, uint8_t* name,
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size_t len, int labs, uint16_t dclass);
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/**
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* Find next root item in name tree.
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* @param tree: the nametree.
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* @param dclass: the class to look for next (or higher).
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* @return false if no classes found, true means class put into c.
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*/
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int name_tree_next_root(rbtree_t* tree, uint16_t* dclass);
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/**
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* Init addr tree to be empty.
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* @param tree: to init.
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*/
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void addr_tree_init(rbtree_t* tree);
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/**
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* insert element into addr tree.
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* @param tree: addr tree
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* @param node: node element (at start of a structure that caller
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* has allocated).
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* @param addr: to insert (copied).
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* @param addrlen: length of addr
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* @param net: size of subnet.
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* @return false on error (duplicate element).
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*/
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int addr_tree_insert(rbtree_t* tree, struct addr_tree_node* node,
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struct sockaddr_storage* addr, socklen_t addrlen, int net);
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/**
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* Initialize parent pointers in addr tree.
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* Should be performed after insertions are done, before lookups
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* @param tree: addr tree
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*/
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void addr_tree_init_parents(rbtree_t* tree);
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/**
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* Lookup closest encloser in addr tree.
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* @param tree: addr tree
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* @param addr: to lookup.
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* @param addrlen: length of addr
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* @return closest enclosing node (could be equal) or NULL if not found.
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*/
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struct addr_tree_node* addr_tree_lookup(rbtree_t* tree,
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struct sockaddr_storage* addr, socklen_t addrlen);
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/** compare name tree nodes */
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int name_tree_compare(const void* k1, const void* k2);
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/** compare addr tree nodes */
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int addr_tree_compare(const void* k1, const void* k2);
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#endif /* UTIL_STORAGE_DNSTREE_H */
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