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1 /***************************************************************************
2  *                                  _   _ ____  _
3  *  Project                     ___| | | |  _ \| |
4  *                             / __| | | | |_) | |
5  *                            | (__| |_| |  _ <| |___
6  *                             \___|\___/|_| \_\_____|
7  *
8  * Copyright (C) 1998 - 2016, 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 
handle_error(const char * file,int lineno,const char * msg)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 
locking_function(int mode,int n,const char * file,int line)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 
id_function(void)63 static unsigned long id_function(void)
64 {
65   return ((unsigned long)THREAD_ID);
66 }
67 
thread_setup(void)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 
thread_cleanup(void)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 }
96