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145 lines
4 KiB
C
145 lines
4 KiB
C
/**
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* \file ssl_cache.h
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*
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* \brief SSL session cache implementation
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*
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* Copyright (C) 2006-2013, ARM Limited, All Rights Reserved
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*
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* This file is part of mbed TLS (https://tls.mbed.org)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef POLARSSL_SSL_CACHE_H
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#define POLARSSL_SSL_CACHE_H
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#include "ssl.h"
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#if defined(POLARSSL_THREADING_C)
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#include "threading.h"
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#endif
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/**
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* \name SECTION: Module settings
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*
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* The configuration options you can set for this module are in this section.
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* Either change them in config.h or define them on the compiler command line.
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* \{
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*/
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#if !defined(SSL_CACHE_DEFAULT_TIMEOUT)
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#define SSL_CACHE_DEFAULT_TIMEOUT 86400 /*!< 1 day */
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#endif
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#if !defined(SSL_CACHE_DEFAULT_MAX_ENTRIES)
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#define SSL_CACHE_DEFAULT_MAX_ENTRIES 50 /*!< Maximum entries in cache */
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#endif
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/* \} name SECTION: Module settings */
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef struct _ssl_cache_context ssl_cache_context;
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typedef struct _ssl_cache_entry ssl_cache_entry;
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/**
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* \brief This structure is used for storing cache entries
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*/
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struct _ssl_cache_entry
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{
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#if defined(POLARSSL_HAVE_TIME)
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time_t timestamp; /*!< entry timestamp */
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#endif
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ssl_session session; /*!< entry session */
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#if defined(POLARSSL_X509_CRT_PARSE_C)
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x509_buf peer_cert; /*!< entry peer_cert */
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#endif
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ssl_cache_entry *next; /*!< chain pointer */
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};
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/**
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* \brief Cache context
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*/
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struct _ssl_cache_context
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{
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ssl_cache_entry *chain; /*!< start of the chain */
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int timeout; /*!< cache entry timeout */
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int max_entries; /*!< maximum entries */
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#if defined(POLARSSL_THREADING_C)
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threading_mutex_t mutex; /*!< mutex */
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#endif
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};
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/**
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* \brief Initialize an SSL cache context
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*
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* \param cache SSL cache context
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*/
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void ssl_cache_init( ssl_cache_context *cache );
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/**
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* \brief Cache get callback implementation
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* (Thread-safe if POLARSSL_THREADING_C is enabled)
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*
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* \param data SSL cache context
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* \param session session to retrieve entry for
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*/
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int ssl_cache_get( void *data, ssl_session *session );
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/**
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* \brief Cache set callback implementation
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* (Thread-safe if POLARSSL_THREADING_C is enabled)
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*
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* \param data SSL cache context
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* \param session session to store entry for
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*/
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int ssl_cache_set( void *data, const ssl_session *session );
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#if defined(POLARSSL_HAVE_TIME)
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/**
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* \brief Set the cache timeout
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* (Default: SSL_CACHE_DEFAULT_TIMEOUT (1 day))
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*
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* A timeout of 0 indicates no timeout.
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*
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* \param cache SSL cache context
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* \param timeout cache entry timeout in seconds
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*/
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void ssl_cache_set_timeout( ssl_cache_context *cache, int timeout );
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#endif /* POLARSSL_HAVE_TIME */
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/**
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* \brief Set the maximun number of cache entries
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* (Default: SSL_CACHE_DEFAULT_MAX_ENTRIES (50))
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*
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* \param cache SSL cache context
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* \param max cache entry maximum
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*/
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void ssl_cache_set_max_entries( ssl_cache_context *cache, int max );
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/**
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* \brief Free referenced items in a cache context and clear memory
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*
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* \param cache SSL cache context
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*/
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void ssl_cache_free( ssl_cache_context *cache );
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#ifdef __cplusplus
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}
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#endif
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#endif /* ssl_cache.h */
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