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131 lines
4.3 KiB
C
131 lines
4.3 KiB
C
/*
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* iterator/iter_hints.h - iterative resolver module stub and root hints.
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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 contains functions to assist the iterator module.
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* Keep track of stub and root hints, and read those from config.
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*/
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#ifndef ITERATOR_ITER_HINTS_H
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#define ITERATOR_ITER_HINTS_H
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#include "util/rbtree.h"
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struct iter_env;
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struct config_file;
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struct delegpt;
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struct region;
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/**
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* Iterator hints structure
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*/
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struct iter_hints {
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/** region where hints are allocated */
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struct region* region;
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/**
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* Hints are stored in this tree. Sort order is specially chosen.
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* first sorted on qtype. Then on dname in nsec-like order, so that
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* a lookup on class, name will return an exact match or the closest
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* match which gives the ancestor needed.
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* contents of type iter_hints_stub. The class IN root is in here.
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*/
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rbtree_t* tree;
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};
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/**
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* Iterator hints for a particular stub.
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*/
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struct iter_hints_stub {
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/** redblacktree node, key is this structure: class and name */
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rbnode_t node;
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/** name */
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uint8_t* name;
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/** length of name */
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size_t namelen;
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/** number of labels in name */
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int namelabs;
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/** delegation point with hint information for this stub. */
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struct delegpt* dp;
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/** pointer to parent in stub hint tree (or NULL if none) */
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struct iter_hints_stub* parent;
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/** class of hints. host order. */
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uint16_t hint_class;
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};
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/**
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* Create hints
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* @return new hints or NULL on error.
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*/
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struct iter_hints* hints_create();
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/**
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* Delete hints.
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* @param hints: to delete.
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*/
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void hints_delete(struct iter_hints* hints);
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/**
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* Process hints config. Sets default values for root hints if no config.
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* @param hints: 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 hints_apply_cfg(struct iter_hints* hints, struct config_file* cfg);
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/**
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* Find root hints for the given class.
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* @param hints: hint storage.
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* @param qclass: class for which root hints are requested. host order.
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* @return: NULL if no hints, or a ptr to stored hints.
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*/
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struct delegpt* hints_lookup_root(struct iter_hints* hints, uint16_t qclass);
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/**
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* Given a qname/qclass combination, and the delegation point from the cache
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* for this qname/qclass, determine if this combination indicates that a
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* stub hint exists and must be primed.
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*
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* @param hints: hint storage.
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* @param qname: The qname that generated the delegation point.
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* @param qclass: The qclass that generated the delegation point.
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* @param dp: The cache generated delegation point.
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* @return: A priming delegation point if there is a stub hint that must
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* be primed, otherwise null.
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*/
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struct delegpt* hints_lookup_stub(struct iter_hints* hints,
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uint8_t* qname, uint16_t qclass, struct delegpt* dp);
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#endif /* ITERATOR_ITER_HINTS_H */
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