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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).
211 lines
8.7 KiB
C
211 lines
8.7 KiB
C
/*
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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
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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 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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#include "util/data/msgreply.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 regional;
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struct delegpt;
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/**
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* Region allocated message reply
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*/
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struct dns_msg {
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/** query info */
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struct query_info qinfo;
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/** reply info - ptr to packed repinfo structure */
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struct reply_info *rep;
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};
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/**
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* Allocate a dns_msg with malloc/alloc structure and store in dns cache.
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*
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* @param env: environment, with alloc structure and dns cache.
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* @param qinf: query info, the query for which answer is stored.
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* this is allocated in a region, and will be copied to malloc area
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* before insertion.
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* @param rep: reply in dns_msg from dns_alloc_msg for example.
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* this is allocated in a region, and will be copied to malloc area
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* before insertion.
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* @param is_referral: If true, then the given message to be stored is a
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* referral. The cache implementation may use this as a hint.
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* It will store only the RRsets, not the message.
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* @param leeway: TTL value, if not 0, other rrsets are considered expired
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* that many seconds before actual TTL expiry.
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* @param pside: if true, information came from a server which was fetched
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* from the parentside of the zonecut. This means that the type NS
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* can be updated to full TTL even in prefetch situations.
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* @param region: region to allocate better entries from cache into.
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* (used when is_referral is false).
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* @param flags: flags with BIT_CD for AAAA queries in dns64 translation.
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* @return 0 on alloc error (out of memory).
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*/
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int dns_cache_store(struct module_env* env, struct query_info* qinf,
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struct reply_info* rep, int is_referral, time_t leeway, int pside,
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struct regional* region, uint16_t flags);
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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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* @param leeway: TTL value, if not 0, other rrsets are considered expired
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* that many seconds before actual TTL expiry.
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* @param pside: if true, information came from a server which was fetched
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* from the parentside of the zonecut. This means that the type NS
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* can be updated to full TTL even in prefetch situations.
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* @param qrep: message that can be altered with better rrs from cache.
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* @param region: to allocate into for qmsg.
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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_type hash, struct reply_info* rep, time_t leeway, int pside,
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struct reply_info* qrep, struct regional* region);
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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 qtype: query type.
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* @param qclass: query class.
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* @param region: where to allocate result delegation.
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* @param msg: if not NULL, delegation message is returned here, synthesized
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* from the cache.
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* @param timenow: the time now, for checking if TTL on cache entries is OK.
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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 qtype, uint16_t qclass,
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struct regional* region, struct dns_msg** msg, time_t timenow);
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/**
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* generate dns_msg from cached message
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* @param env: module environment with the DNS cache. NULL if the LRU from cache
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* does not need to be touched.
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* @param q: query info, contains qname that will make up the dns message.
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* @param r: reply info that, together with qname, will make up the dns message.
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* @param region: where to allocate dns message.
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* @param now: the time now, for check if TTL on cache entry is ok.
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* @param scratch: where to allocate temporary data.
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* */
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struct dns_msg* tomsg(struct module_env* env, struct query_info* q,
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struct reply_info* r, struct regional* region, time_t now,
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struct regional* scratch);
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/**
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* Find cached message
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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 qtype: query type.
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* @param qclass: query class.
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* @param flags: flags with BIT_CD for AAAA queries in dns64 translation.
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* @param region: where to allocate result.
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* @param scratch: where to allocate temporary data.
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* @return new response message (alloced in region, rrsets do not have IDs).
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* or NULL on error or if not found in cache.
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* TTLs are made relative to the current time.
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*/
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struct dns_msg* dns_cache_lookup(struct module_env* env,
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uint8_t* qname, size_t qnamelen, uint16_t qtype, uint16_t qclass,
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uint16_t flags, struct regional* region, struct regional* scratch);
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/**
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* find and add A and AAAA records for missing nameservers in delegpt
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* @param env: module environment with rrset cache
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* @param qclass: which class to look in.
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* @param region: where to store new dp info.
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* @param dp: delegation point to fill missing entries.
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* @return false on alloc failure.
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*/
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int cache_fill_missing(struct module_env* env, uint16_t qclass,
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struct regional* region, struct delegpt* dp);
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/**
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* Utility, create new, unpacked data structure for cache response.
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* QR bit set, no AA. Query set as indicated. Space for number of rrsets.
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* @param qname: query section name
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* @param qnamelen: len of qname
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* @param qtype: query section type
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* @param qclass: query section class
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* @param region: where to alloc.
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* @param capacity: number of rrsets space to create in the array.
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* @return new dns_msg struct or NULL on mem fail.
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*/
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struct dns_msg* dns_msg_create(uint8_t* qname, size_t qnamelen, uint16_t qtype,
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uint16_t qclass, struct regional* region, size_t capacity);
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/**
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* Add rrset to authority section in unpacked dns_msg message. Must have enough
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* space left, does not grow the array.
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* @param msg: msg to put it in.
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* @param region: region to alloc in
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* @param rrset: to add in authority section
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* @param now: now.
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* @return true if worked, false on fail
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*/
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int dns_msg_authadd(struct dns_msg* msg, struct regional* region,
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struct ub_packed_rrset_key* rrset, time_t now);
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/**
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* Adjust the prefetch_ttl for a cached message. This adds a value to the
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* prefetch ttl - postponing the time when it will be prefetched for future
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* incoming queries.
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* @param env: module environment with caches and time.
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* @param qinfo: query info for the query that needs adjustment.
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* @param adjust: time in seconds to add to the prefetch_leeway.
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* @param flags: flags with BIT_CD for AAAA queries in dns64 translation.
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* @return false if not in cache. true if added.
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*/
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int dns_cache_prefetch_adjust(struct module_env* env, struct query_info* qinfo,
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time_t adjust, uint16_t flags);
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#endif /* SERVICES_CACHE_DNS_H */
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