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119 lines
4.0 KiB
C
119 lines
4.0 KiB
C
/*
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* validator/val_kcache.h - validator key shared cache with validated keys
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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 functions for caching validated key entries.
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*/
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#ifndef VALIDATOR_VAL_KCACHE_H
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#define VALIDATOR_VAL_KCACHE_H
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#include "util/storage/slabhash.h"
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struct key_entry_key;
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struct key_entry_data;
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struct config_file;
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struct regional;
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struct module_qstate;
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/**
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* Key cache
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*/
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struct key_cache {
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/** uses slabhash for storage, type key_entry_key, key_entry_data */
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struct slabhash* slab;
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};
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/**
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* Create the key cache
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* @param cfg: config settings for the key cache.
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* @return new key cache or NULL on malloc failure.
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*/
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struct key_cache* key_cache_create(struct config_file* cfg);
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/**
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* Delete the key cache
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* @param kcache: to delete
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*/
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void key_cache_delete(struct key_cache* kcache);
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/**
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* Insert or update a key cache entry. Note that the insert may silently
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* fail if there is not enough memory.
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*
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* @param kcache: the key cache.
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* @param kkey: key entry key, assumed malloced in a region, is copied
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* to perform update or insertion. Its data pointer is also copied.
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* @param qstate: store errinf reason in case its bad.
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*/
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void key_cache_insert(struct key_cache* kcache, struct key_entry_key* kkey,
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struct module_qstate* qstate);
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/**
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* Remove an entry from the key cache.
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* @param kcache: the key cache.
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* @param name: for what name to look; uncompressed wireformat
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* @param namelen: length of the name.
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* @param key_class: class of the key.
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*/
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void key_cache_remove(struct key_cache* kcache,
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uint8_t* name, size_t namelen, uint16_t key_class);
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/**
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* Lookup key entry in the cache. Looks up the closest key entry above the
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* given name.
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* @param kcache: the key cache.
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* @param name: for what name to look; uncompressed wireformat
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* @param namelen: length of the name.
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* @param key_class: class of the key.
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* @param region: a copy of the key_entry is allocated in this region.
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* @param now: current time.
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* @return pointer to a newly allocated key_entry copy in the region, if
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* a key entry could be found, and allocation succeeded and TTL was OK.
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* Otherwise, NULL is returned.
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*/
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struct key_entry_key* key_cache_obtain(struct key_cache* kcache,
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uint8_t* name, size_t namelen, uint16_t key_class,
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struct regional* region, time_t now);
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/**
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* Get memory in use by the key cache.
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* @param kcache: the key cache.
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* @return memory in use in bytes.
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*/
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size_t key_cache_get_mem(struct key_cache* kcache);
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#endif /* VALIDATOR_VAL_KCACHE_H */
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