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/*
* This file is part of the SSH Library
*
* Copyright (c) 2010 by Aris Adamantiadis
*
* The SSH Library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or (at your
* option) any later version.
*
* The SSH Library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with the SSH Library; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
* MA 02111-1307, USA.
*/
/**
* @defgroup libssh_threads The SSH threading functions.
* @ingroup libssh
*
* Threading with libssh
* @{
*/
#include "config.h"
#include "libssh/priv.h"
#include "libssh/crypto.h"
#include "libssh/threads.h"
static int threads_noop (void **lock){
(void)lock;
return 0;
}
static unsigned long threads_id_noop (void){
return 1;
}
static struct ssh_threads_callbacks_struct ssh_threads_noop =
{
"threads_noop",
threads_noop,
threads_noop,
threads_noop,
threads_noop,
threads_id_noop
};
struct ssh_threads_callbacks_struct *ssh_threads_get_noop(void) {
return &ssh_threads_noop;
}
static struct ssh_threads_callbacks_struct *user_callbacks =&ssh_threads_noop;
#ifdef HAVE_LIBGCRYPT
/* Libgcrypt specific way of handling thread callbacks */
static struct gcry_thread_cbs gcrypt_threads_callbacks;
static int libgcrypt_thread_init(void){
if(user_callbacks == NULL)
return SSH_ERROR;
if(user_callbacks == &ssh_threads_noop){
gcrypt_threads_callbacks.option= GCRY_THREAD_OPTION_VERSION << 8 || GCRY_THREAD_OPTION_DEFAULT;
} else {
gcrypt_threads_callbacks.option= GCRY_THREAD_OPTION_VERSION << 8 || GCRY_THREAD_OPTION_USER;
}
gcrypt_threads_callbacks.mutex_init=user_callbacks->mutex_init;
gcrypt_threads_callbacks.mutex_destroy=user_callbacks->mutex_destroy;
gcrypt_threads_callbacks.mutex_lock=user_callbacks->mutex_lock;
gcrypt_threads_callbacks.mutex_unlock=user_callbacks->mutex_unlock;
gcry_control(GCRYCTL_SET_THREAD_CBS, &gcrypt_threads_callbacks);
return SSH_OK;
}
#else
/* Libcrypto specific stuff */
static void **libcrypto_mutexes;
static void libcrypto_lock_callback(int mode, int i, const char *file, int line){
(void)file;
(void)line;
if(mode & CRYPTO_LOCK){
user_callbacks->mutex_lock(&libcrypto_mutexes[i]);
} else {
user_callbacks->mutex_unlock(&libcrypto_mutexes[i]);
}
}
static int libcrypto_thread_init(void){
int n=CRYPTO_num_locks();
int i;
if(user_callbacks == &ssh_threads_noop)
return SSH_OK;
libcrypto_mutexes=malloc(sizeof(void *) * n);
if (libcrypto_mutexes == NULL)
return SSH_ERROR;
for (i=0;i<n;++i){
user_callbacks->mutex_init(&libcrypto_mutexes[i]);
}
CRYPTO_set_id_callback(user_callbacks->thread_id);
CRYPTO_set_locking_callback(libcrypto_lock_callback);
return SSH_OK;
}
static void libcrypto_thread_finalize(void){
int n=CRYPTO_num_locks();
int i;
if (libcrypto_mutexes==NULL)
return;
for (i=0;i<n;++i){
user_callbacks->mutex_destroy(&libcrypto_mutexes[i]);
}
SAFE_FREE(libcrypto_mutexes);
}
#endif
/** @internal
* @brief inits the threading with the backend cryptographic libraries
*/
int ssh_threads_init(void){
static int threads_initialized=0;
int ret;
if(threads_initialized)
return SSH_OK;
/* first initialize the user_callbacks with our default handlers if not
* already the case
*/
if(user_callbacks == NULL){
user_callbacks=&ssh_threads_noop;
}
/* Then initialize the crypto libraries threading callbacks */
#ifdef HAVE_LIBGCRYPT
ret = libgcrypt_thread_init();
#else /* Libcrypto */
ret = libcrypto_thread_init();
#endif
if(ret == SSH_OK)
threads_initialized=1;
return ret;
}
void ssh_threads_finalize(void){
#ifdef HAVE_LIBGCRYPT
#else
libcrypto_thread_finalize();
#endif
}
int ssh_threads_set_callbacks(struct ssh_threads_callbacks_struct *cb){
user_callbacks=cb;
return SSH_OK;
}
const char *ssh_threads_get_type(void) {
if(user_callbacks != NULL)
return user_callbacks->type;
return NULL;
}
/**
* @}
*/
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