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    1: /***************************************************************************
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    3:  *  Project                     ___| | | |  _ \| |
    4:  *                             / __| | | | |_) | |
    5:  *                            | (__| |_| |  _ <| |___
    6:  *                             \___|\___/|_| \_\_____|
    7:  *
    8:  * Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al.
    9:  *
   10:  * This software is licensed as described in the file COPYING, which
   11:  * you should have received as part of this distribution. The terms
   12:  * are also available at https://curl.haxx.se/docs/copyright.html.
   13:  *
   14:  * You may opt to use, copy, modify, merge, publish, distribute and/or sell
   15:  * copies of the Software, and permit persons to whom the Software is
   16:  * furnished to do so, under the terms of the COPYING file.
   17:  *
   18:  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
   19:  * KIND, either express or implied.
   20:  *
   21:  ***************************************************************************/
   22: /* <DESC>
   23:  * one way to set the necessary OpenSSL locking callbacks if you want to do
   24:  * multi-threaded transfers with HTTPS/FTPS with libcurl built to use OpenSSL.
   25:  * </DESC>
   26:  */
   27: /*
   28:  * This is not a complete stand-alone example.
   29:  *
   30:  * Author: Jeremy Brown
   31:  */
   32: 
   33: #include <stdio.h>
   34: #include <pthread.h>
   35: #include <openssl/err.h>
   36: 
   37: #define MUTEX_TYPE       pthread_mutex_t
   38: #define MUTEX_SETUP(x)   pthread_mutex_init(&(x), NULL)
   39: #define MUTEX_CLEANUP(x) pthread_mutex_destroy(&(x))
   40: #define MUTEX_LOCK(x)    pthread_mutex_lock(&(x))
   41: #define MUTEX_UNLOCK(x)  pthread_mutex_unlock(&(x))
   42: #define THREAD_ID        pthread_self()
   43: 
   44: 
   45: void handle_error(const char *file, int lineno, const char *msg)
   46: {
   47:   fprintf(stderr, "** %s:%d %s\n", file, lineno, msg);
   48:   ERR_print_errors_fp(stderr);
   49:   /* exit(-1); */
   50: }
   51: 
   52: /* This array will store all of the mutexes available to OpenSSL. */
   53: static MUTEX_TYPE *mutex_buf = NULL;
   54: 
   55: static void locking_function(int mode, int n, const char *file, int line)
   56: {
   57:   if(mode & CRYPTO_LOCK)
   58:     MUTEX_LOCK(mutex_buf[n]);
   59:   else
   60:     MUTEX_UNLOCK(mutex_buf[n]);
   61: }
   62: 
   63: static unsigned long id_function(void)
   64: {
   65:   return ((unsigned long)THREAD_ID);
   66: }
   67: 
   68: int thread_setup(void)
   69: {
   70:   int i;
   71: 
   72:   mutex_buf = malloc(CRYPTO_num_locks() * sizeof(MUTEX_TYPE));
   73:   if(!mutex_buf)
   74:     return 0;
   75:   for(i = 0;  i < CRYPTO_num_locks();  i++)
   76:     MUTEX_SETUP(mutex_buf[i]);
   77:   CRYPTO_set_id_callback(id_function);
   78:   CRYPTO_set_locking_callback(locking_function);
   79:   return 1;
   80: }
   81: 
   82: int thread_cleanup(void)
   83: {
   84:   int i;
   85: 
   86:   if(!mutex_buf)
   87:     return 0;
   88:   CRYPTO_set_id_callback(NULL);
   89:   CRYPTO_set_locking_callback(NULL);
   90:   for(i = 0;  i < CRYPTO_num_locks();  i++)
   91:     MUTEX_CLEANUP(mutex_buf[i]);
   92:   free(mutex_buf);
   93:   mutex_buf = NULL;
   94:   return 1;
   95: }