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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at https://curl.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
***************************************************************************/
/* <DESC>
* one way to set the necessary OpenSSL locking callbacks if you want to do
* multi-threaded transfers with HTTPS/FTPS with libcurl built to use OpenSSL.
* </DESC>
*/
/*
* This is not a complete stand-alone example.
*
* Author: Jeremy Brown
*/
#include <stdio.h>
#include <pthread.h>
#include <openssl/err.h>
#define MUTEX_TYPE pthread_mutex_t
#define MUTEX_SETUP(x) pthread_mutex_init(&(x), NULL)
#define MUTEX_CLEANUP(x) pthread_mutex_destroy(&(x))
#define MUTEX_LOCK(x) pthread_mutex_lock(&(x))
#define MUTEX_UNLOCK(x) pthread_mutex_unlock(&(x))
#define THREAD_ID pthread_self()
void handle_error(const char *file, int lineno, const char *msg)
{
fprintf(stderr, "** %s:%d %s\n", file, lineno, msg);
ERR_print_errors_fp(stderr);
/* exit(-1); */
}
/* This array will store all of the mutexes available to OpenSSL. */
static MUTEX_TYPE *mutex_buf = NULL;
static void locking_function(int mode, int n, const char *file, int line)
{
if(mode & CRYPTO_LOCK)
MUTEX_LOCK(mutex_buf[n]);
else
MUTEX_UNLOCK(mutex_buf[n]);
}
static unsigned long id_function(void)
{
return ((unsigned long)THREAD_ID);
}
int thread_setup(void)
{
int i;
mutex_buf = malloc(CRYPTO_num_locks() * sizeof(MUTEX_TYPE));
if(!mutex_buf)
return 0;
for(i = 0; i < CRYPTO_num_locks(); i++)
MUTEX_SETUP(mutex_buf[i]);
CRYPTO_set_id_callback(id_function);
CRYPTO_set_locking_callback(locking_function);
return 1;
}
int thread_cleanup(void)
{
int i;
if(!mutex_buf)
return 0;
CRYPTO_set_id_callback(NULL);
CRYPTO_set_locking_callback(NULL);
for(i = 0; i < CRYPTO_num_locks(); i++)
MUTEX_CLEANUP(mutex_buf[i]);
free(mutex_buf);
mutex_buf = NULL;
return 1;
}
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