a85b5759f3
These files were pulled from the 1.6.3 release tarball. This new version builds against OpenSSL version 1.1 which will be the default in the new Debian Stable which is due to be released RealSoonNow (tm).
204 lines
6.4 KiB
C
204 lines
6.4 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_type.
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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_type 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_type.
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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_type 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_type* 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_type* 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_type* 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_type* 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_type* 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_type* 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_type* 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_type* 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_type* 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_type* tree,
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struct sockaddr_storage* addr, socklen_t addrlen);
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/**
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* Find element in addr tree. (search a netblock, not a match for an address)
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* @param tree: addr tree
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* @param addr: netblock to lookup.
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* @param addrlen: length of addr
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* @param net: size of subnet
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* @return addr tree element, or NULL if not found.
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*/
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struct addr_tree_node* addr_tree_find(rbtree_type* tree,
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struct sockaddr_storage* addr, socklen_t addrlen, int net);
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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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