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83 lines
3 KiB
C
83 lines
3 KiB
C
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/*
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* services/cache/dns.h - Cache services for DNS using msg and rrset caches.
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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 the DNS cache.
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*/
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#ifndef SERVICES_CACHE_DNS_H
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#define SERVICES_CACHE_DNS_H
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#include "util/storage/lruhash.h"
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struct module_env;
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struct query_info;
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struct reply_info;
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struct region;
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struct delegpt;
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/**
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* Store message in the cache. Stores in message cache and rrset cache.
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* Both qinfo and rep should be malloced and are put in the cache.
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* They should not be used after this call, as they are then in shared cache.
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* Does not return errors, they are logged and only lead to less cache.
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*
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* @param env: module environment with the DNS cache.
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* @param qinfo: query info
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* @param hash: hash over qinfo.
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* @param rep: reply info, together with qinfo makes up the message.
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* Adjusts the reply info TTLs to absolute time.
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*/
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void dns_cache_store_msg(struct module_env* env, struct query_info* qinfo,
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hashvalue_t hash, struct reply_info* rep);
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/**
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* Find a delegation from the cache.
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* @param env: module environment with the DNS cache.
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* @param qname: query name.
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* @param qnamelen: length of qname.
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* @param qclass: query class.
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* @param region: where to allocate result delegation.
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* @return new delegation or NULL on error or if not found in cache.
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*/
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struct delegpt* dns_cache_find_delegation(struct module_env* env,
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uint8_t* qname, size_t qnamelen, uint16_t qclass,
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struct region* region);
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/** Find cached message */
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/** Find covering DNAME */
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#endif /* SERVICES_CACHE_DNS_H */
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