mirror of
https://github.com/NLnetLabs/unbound.git
synced 2025-12-20 23:00:56 -05:00
109 lines
3.9 KiB
C
109 lines
3.9 KiB
C
/*
|
|
* services/cache/dns.h - Cache services for DNS using msg and rrset caches.
|
|
*
|
|
* Copyright (c) 2007, NLnet Labs. All rights reserved.
|
|
*
|
|
* This software is open source.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* Redistributions of source code must retain the above copyright notice,
|
|
* this list of conditions and the following disclaimer.
|
|
*
|
|
* Redistributions in binary form must reproduce the above copyright notice,
|
|
* this list of conditions and the following disclaimer in the documentation
|
|
* and/or other materials provided with the distribution.
|
|
*
|
|
* Neither the name of the NLNET LABS nor the names of its contributors may
|
|
* be used to endorse or promote products derived from this software without
|
|
* specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
|
|
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
|
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE
|
|
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
/**
|
|
* \file
|
|
*
|
|
* This file contains the DNS cache.
|
|
*/
|
|
|
|
#ifndef SERVICES_CACHE_DNS_H
|
|
#define SERVICES_CACHE_DNS_H
|
|
#include "util/storage/lruhash.h"
|
|
#include "util/data/msgreply.h"
|
|
struct module_env;
|
|
struct query_info;
|
|
struct reply_info;
|
|
struct region;
|
|
struct delegpt;
|
|
|
|
/**
|
|
* Region allocated message reply
|
|
*/
|
|
struct dns_msg {
|
|
/** query info */
|
|
struct query_info qinfo;
|
|
/** reply info - ptr to packed repinfo structure */
|
|
struct reply_info *rep;
|
|
};
|
|
|
|
/**
|
|
* Store message in the cache. Stores in message cache and rrset cache.
|
|
* Both qinfo and rep should be malloced and are put in the cache.
|
|
* They should not be used after this call, as they are then in shared cache.
|
|
* Does not return errors, they are logged and only lead to less cache.
|
|
*
|
|
* @param env: module environment with the DNS cache.
|
|
* @param qinfo: query info
|
|
* @param hash: hash over qinfo.
|
|
* @param rep: reply info, together with qinfo makes up the message.
|
|
* Adjusts the reply info TTLs to absolute time.
|
|
*/
|
|
void dns_cache_store_msg(struct module_env* env, struct query_info* qinfo,
|
|
hashvalue_t hash, struct reply_info* rep);
|
|
|
|
/**
|
|
* Find a delegation from the cache.
|
|
* @param env: module environment with the DNS cache.
|
|
* @param qname: query name.
|
|
* @param qnamelen: length of qname.
|
|
* @param qclass: query class.
|
|
* @param region: where to allocate result delegation.
|
|
* @return new delegation or NULL on error or if not found in cache.
|
|
*/
|
|
struct delegpt* dns_cache_find_delegation(struct module_env* env,
|
|
uint8_t* qname, size_t qnamelen, uint16_t qclass,
|
|
struct region* region);
|
|
|
|
/**
|
|
* Find cached message
|
|
* @param env: module environment with the DNS cache.
|
|
* @param qname: query name.
|
|
* @param qnamelen: length of qname.
|
|
* @param qtype: query type.
|
|
* @param qclass: query class.
|
|
* @param region: where to allocate result.
|
|
* @param scratch: where to allocate temporary data.
|
|
* @return new response message (alloced in region, rrsets do not have IDs).
|
|
* or NULL on error or if not found in cache.
|
|
* TTLs are made relative to the current time.
|
|
*/
|
|
struct dns_msg* dns_cache_lookup(struct module_env* env,
|
|
uint8_t* qname, size_t qnamelen, uint16_t qtype, uint16_t qclass,
|
|
struct region* region, struct region* scratch);
|
|
|
|
/** Find covering DNAME */
|
|
|
|
#endif /* SERVICES_CACHE_DNS_H */
|