1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 1998 - 2011, 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 http://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 /* Example source code to show one way to set the necessary OpenSSL locking
23 * callbacks if you want to do multi-threaded transfers with HTTPS/FTPS with
24 * libcurl built to use OpenSSL.
25 *
26 * This is not a complete stand-alone example.
27 *
28 * Author: Jeremy Brown
29 */
30
31
32 #include <stdio.h>
33 #include <pthread.h>
34 #include <openssl/err.h>
35
36 #define MUTEX_TYPE pthread_mutex_t
37 #define MUTEX_SETUP(x) pthread_mutex_init(&(x), NULL)
38 #define MUTEX_CLEANUP(x) pthread_mutex_destroy(&(x))
39 #define MUTEX_LOCK(x) pthread_mutex_lock(&(x))
40 #define MUTEX_UNLOCK(x) pthread_mutex_unlock(&(x))
41 #define THREAD_ID pthread_self( )
42
43
handle_error(const char * file,int lineno,const char * msg)44 void handle_error(const char *file, int lineno, const char *msg){
45 fprintf(stderr, "** %s:%d %s\n", file, lineno, msg);
46 ERR_print_errors_fp(stderr);
47 /* exit(-1); */
48 }
49
50 /* This array will store all of the mutexes available to OpenSSL. */
51 static MUTEX_TYPE *mutex_buf= NULL;
52
53
locking_function(int mode,int n,const char * file,int line)54 static void locking_function(int mode, int n, const char * file, int line)
55 {
56 if (mode & CRYPTO_LOCK)
57 MUTEX_LOCK(mutex_buf[n]);
58 else
59 MUTEX_UNLOCK(mutex_buf[n]);
60 }
61
id_function(void)62 static unsigned long id_function(void)
63 {
64 return ((unsigned long)THREAD_ID);
65 }
66
thread_setup(void)67 int thread_setup(void)
68 {
69 int i;
70
71 mutex_buf = malloc(CRYPTO_num_locks( ) * sizeof(MUTEX_TYPE));
72 if (!mutex_buf)
73 return 0;
74 for (i = 0; i < CRYPTO_num_locks( ); i++)
75 MUTEX_SETUP(mutex_buf[i]);
76 CRYPTO_set_id_callback(id_function);
77 CRYPTO_set_locking_callback(locking_function);
78 return 1;
79 }
80
thread_cleanup(void)81 int thread_cleanup(void)
82 {
83 int i;
84
85 if (!mutex_buf)
86 return 0;
87 CRYPTO_set_id_callback(NULL);
88 CRYPTO_set_locking_callback(NULL);
89 for (i = 0; i < CRYPTO_num_locks( ); i++)
90 MUTEX_CLEANUP(mutex_buf[i]);
91 free(mutex_buf);
92 mutex_buf = NULL;
93 return 1;
94 }
95