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/*-
* SSLsplit - transparent SSL/TLS interception
* https://www.roe.ch/SSLsplit
*
* Copyright (c) 2009-2019, Daniel Roethlisberger <daniel@roe.ch>.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER 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.
*/
#include "cache.h"
#include "log.h"
#include "khash.h"
#include <pthread.h>
/*
* Generic, thread-safe cache.
*/
/*
* Create a new cache based on the initializer callback init_cb.
*/
cache_t *
cache_new(cache_init_cb_t init_cb)
{
cache_t *cache;
if (!(cache = malloc(sizeof(cache_t))))
return NULL;
if (pthread_mutex_init(&cache->mutex, NULL)) {
free(cache);
return NULL;
}
init_cb(cache);
return cache;
}
/*
* Reinitialize cache after fork(). Returns 0 on success, -1 on failure.
*/
int
cache_reinit(cache_t *cache)
{
return pthread_mutex_init(&cache->mutex, NULL) ? -1 : 0;
}
/*
* Free a cache and all associated resources.
* This function is not thread-safe.
*/
void
cache_free(cache_t *cache)
{
khiter_t it;
for (it = cache->begin_cb(); it != cache->end_cb(); it++) {
if (cache->exist_cb(it)) {
cache->free_key_cb(cache->get_key_cb(it));
cache->free_val_cb(cache->get_val_cb(it));
}
}
cache->fini_cb();
pthread_mutex_destroy(&cache->mutex);
free(cache);
}
void
cache_gc(cache_t *cache)
{
khiter_t it;
cache_val_t val;
pthread_mutex_lock(&cache->mutex);
for (it = cache->begin_cb(); it != cache->end_cb(); it++) {
if (cache->exist_cb(it)) {
val = cache->get_val_cb(it);
if (!cache->unpackverify_val_cb(val, 0)) {
cache->free_val_cb(val);
cache->free_key_cb(cache->get_key_cb(it));
cache->del_cb(it);
}
}
}
pthread_mutex_unlock(&cache->mutex);
}
cache_val_t
cache_get(cache_t *cache, cache_key_t key)
{
cache_val_t rval = NULL;
khiter_t it;
if (!key)
return NULL;
pthread_mutex_lock(&cache->mutex);
it = cache->get_cb(key);
if (it != cache->end_cb()) {
cache_val_t val;
val = cache->get_val_cb(it);
if (!(rval = cache->unpackverify_val_cb(val, 1))) {
cache->free_val_cb(val);
cache->free_key_cb(cache->get_key_cb(it));
cache->del_cb(it);
}
}
cache->free_key_cb(key);
pthread_mutex_unlock(&cache->mutex);
return rval;
}
void
cache_set(cache_t *cache, cache_key_t key, cache_val_t val)
{
khiter_t it;
int ret;
if (!key || !val)
return;
pthread_mutex_lock(&cache->mutex);
it = cache->put_cb(key, &ret);
if (!ret) {
cache->free_key_cb(key);
cache->free_val_cb(cache->get_val_cb(it));
}
cache->set_val_cb(it, val);
pthread_mutex_unlock(&cache->mutex);
}
void
cache_del(cache_t *cache, cache_key_t key)
{
khiter_t it;
pthread_mutex_lock(&cache->mutex);
it = cache->get_cb(key);
if (it != cache->end_cb()) {
cache->free_val_cb(cache->get_val_cb(it));
cache->free_key_cb(cache->get_key_cb(it));
cache->del_cb(it);
}
cache->free_key_cb(key);
pthread_mutex_unlock(&cache->mutex);
}
/* vim: set noet ft=c: */
|
