mirror of
https://codeberg.org/anoncontributorxmr/monero.git
synced 2024-11-23 19:33:28 +01:00
198 lines
8.1 KiB
C
198 lines
8.1 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 COPYRIGHT
|
|
* HOLDER 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 regional;
|
|
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;
|
|
};
|
|
|
|
/**
|
|
* Allocate a dns_msg with malloc/alloc structure and store in dns cache.
|
|
*
|
|
* @param env: environment, with alloc structure and dns cache.
|
|
* @param qinf: query info, the query for which answer is stored.
|
|
* this is allocated in a region, and will be copied to malloc area
|
|
* before insertion.
|
|
* @param rep: reply in dns_msg from dns_alloc_msg for example.
|
|
* this is allocated in a region, and will be copied to malloc area
|
|
* before insertion.
|
|
* @param is_referral: If true, then the given message to be stored is a
|
|
* referral. The cache implementation may use this as a hint.
|
|
* It will store only the RRsets, not the message.
|
|
* @param leeway: TTL value, if not 0, other rrsets are considered expired
|
|
* that many seconds before actual TTL expiry.
|
|
* @param pside: if true, information came from a server which was fetched
|
|
* from the parentside of the zonecut. This means that the type NS
|
|
* can be updated to full TTL even in prefetch situations.
|
|
* @param region: region to allocate better entries from cache into.
|
|
* (used when is_referral is false).
|
|
* @param flags: flags with BIT_CD for AAAA queries in dns64 translation.
|
|
* @return 0 on alloc error (out of memory).
|
|
*/
|
|
int dns_cache_store(struct module_env* env, struct query_info* qinf,
|
|
struct reply_info* rep, int is_referral, time_t leeway, int pside,
|
|
struct regional* region, uint16_t flags);
|
|
|
|
/**
|
|
* 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.
|
|
* @param leeway: TTL value, if not 0, other rrsets are considered expired
|
|
* that many seconds before actual TTL expiry.
|
|
* @param pside: if true, information came from a server which was fetched
|
|
* from the parentside of the zonecut. This means that the type NS
|
|
* can be updated to full TTL even in prefetch situations.
|
|
* @param qrep: message that can be altered with better rrs from cache.
|
|
* @param region: to allocate into for qmsg.
|
|
*/
|
|
void dns_cache_store_msg(struct module_env* env, struct query_info* qinfo,
|
|
hashvalue_t hash, struct reply_info* rep, time_t leeway, int pside,
|
|
struct reply_info* qrep, struct regional* region);
|
|
|
|
/**
|
|
* Find a delegation from the cache.
|
|
* @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 delegation.
|
|
* @param msg: if not NULL, delegation message is returned here, synthesized
|
|
* from the cache.
|
|
* @param timenow: the time now, for checking if TTL on cache entries is OK.
|
|
* @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 qtype, uint16_t qclass,
|
|
struct regional* region, struct dns_msg** msg, time_t timenow);
|
|
|
|
/**
|
|
* 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 flags: flags with BIT_CD for AAAA queries in dns64 translation.
|
|
* @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,
|
|
uint16_t flags, struct regional* region, struct regional* scratch);
|
|
|
|
/**
|
|
* find and add A and AAAA records for missing nameservers in delegpt
|
|
* @param env: module environment with rrset cache
|
|
* @param qclass: which class to look in.
|
|
* @param region: where to store new dp info.
|
|
* @param dp: delegation point to fill missing entries.
|
|
* @return false on alloc failure.
|
|
*/
|
|
int cache_fill_missing(struct module_env* env, uint16_t qclass,
|
|
struct regional* region, struct delegpt* dp);
|
|
|
|
/**
|
|
* Utility, create new, unpacked data structure for cache response.
|
|
* QR bit set, no AA. Query set as indicated. Space for number of rrsets.
|
|
* @param qname: query section name
|
|
* @param qnamelen: len of qname
|
|
* @param qtype: query section type
|
|
* @param qclass: query section class
|
|
* @param region: where to alloc.
|
|
* @param capacity: number of rrsets space to create in the array.
|
|
* @return new dns_msg struct or NULL on mem fail.
|
|
*/
|
|
struct dns_msg* dns_msg_create(uint8_t* qname, size_t qnamelen, uint16_t qtype,
|
|
uint16_t qclass, struct regional* region, size_t capacity);
|
|
|
|
/**
|
|
* Add rrset to authority section in unpacked dns_msg message. Must have enough
|
|
* space left, does not grow the array.
|
|
* @param msg: msg to put it in.
|
|
* @param region: region to alloc in
|
|
* @param rrset: to add in authority section
|
|
* @param now: now.
|
|
* @return true if worked, false on fail
|
|
*/
|
|
int dns_msg_authadd(struct dns_msg* msg, struct regional* region,
|
|
struct ub_packed_rrset_key* rrset, time_t now);
|
|
|
|
/**
|
|
* Adjust the prefetch_ttl for a cached message. This adds a value to the
|
|
* prefetch ttl - postponing the time when it will be prefetched for future
|
|
* incoming queries.
|
|
* @param env: module environment with caches and time.
|
|
* @param qinfo: query info for the query that needs adjustment.
|
|
* @param adjust: time in seconds to add to the prefetch_leeway.
|
|
* @param flags: flags with BIT_CD for AAAA queries in dns64 translation.
|
|
* @return false if not in cache. true if added.
|
|
*/
|
|
int dns_cache_prefetch_adjust(struct module_env* env, struct query_info* qinfo,
|
|
time_t adjust, uint16_t flags);
|
|
|
|
#endif /* SERVICES_CACHE_DNS_H */
|