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curl/docs/examples/threaded-ssl.c
Daniel Stenberg 3a6563d668 examples: adhere to curl code style
All plain C examples now (mostly) adhere to the curl code style. While
they are only examples, they had diverted so much and contained all
sorts of different mixed code styles by now. Having them use a unified
style helps users and readability. Also, as they get copy-and-pasted
widely by users, making sure they're clean and nice is a good idea.

573 checksrc warnings were addressed.
2016-02-11 09:44:45 +01:00

168 lines
4.3 KiB
C

/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2016, 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.haxx.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>
* Show the required mutex callback setups for GnuTLS and OpenSSL when using
* libcurl multi-threaded.
* </DESC>
*/
/* A multi-threaded example that uses pthreads and fetches 4 remote files at
* once over HTTPS. The lock callbacks and stuff assume OpenSSL or GnuTLS
* (libgcrypt) so far.
*
* OpenSSL docs for this:
* https://www.openssl.org/docs/crypto/threads.html
* gcrypt docs for this:
* https://gnupg.org/documentation/manuals/gcrypt/Multi_002dThreading.html
*/
#define USE_OPENSSL /* or USE_GNUTLS accordingly */
#include <stdio.h>
#include <pthread.h>
#include <curl/curl.h>
#define NUMT 4
/* we have this global to let the callback get easy access to it */
static pthread_mutex_t *lockarray;
#ifdef USE_OPENSSL
#include <openssl/crypto.h>
static void lock_callback(int mode, int type, char *file, int line)
{
(void)file;
(void)line;
if(mode & CRYPTO_LOCK) {
pthread_mutex_lock(&(lockarray[type]));
}
else {
pthread_mutex_unlock(&(lockarray[type]));
}
}
static unsigned long thread_id(void)
{
unsigned long ret;
ret=(unsigned long)pthread_self();
return ret;
}
static void init_locks(void)
{
int i;
lockarray=(pthread_mutex_t *)OPENSSL_malloc(CRYPTO_num_locks() *
sizeof(pthread_mutex_t));
for(i=0; i<CRYPTO_num_locks(); i++) {
pthread_mutex_init(&(lockarray[i]), NULL);
}
CRYPTO_set_id_callback((unsigned long (*)())thread_id);
CRYPTO_set_locking_callback((void (*)())lock_callback);
}
static void kill_locks(void)
{
int i;
CRYPTO_set_locking_callback(NULL);
for(i=0; i<CRYPTO_num_locks(); i++)
pthread_mutex_destroy(&(lockarray[i]));
OPENSSL_free(lockarray);
}
#endif
#ifdef USE_GNUTLS
#include <gcrypt.h>
#include <errno.h>
GCRY_THREAD_OPTION_PTHREAD_IMPL;
void init_locks(void)
{
gcry_control(GCRYCTL_SET_THREAD_CBS);
}
#define kill_locks()
#endif
/* List of URLs to fetch.*/
const char * const urls[]= {
"https://www.example.com/",
"https://www2.example.com/",
"https://www3.example.com/",
"https://www4.example.com/",
};
static void *pull_one_url(void *url)
{
CURL *curl;
curl = curl_easy_init();
curl_easy_setopt(curl, CURLOPT_URL, url);
/* this example doesn't verify the server's certificate, which means we
might be downloading stuff from an impostor */
curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);
curl_easy_perform(curl); /* ignores error */
curl_easy_cleanup(curl);
return NULL;
}
int main(int argc, char **argv)
{
pthread_t tid[NUMT];
int i;
int error;
(void)argc; /* we don't use any arguments in this example */
(void)argv;
/* Must initialize libcurl before any threads are started */
curl_global_init(CURL_GLOBAL_ALL);
init_locks();
for(i=0; i< NUMT; i++) {
error = pthread_create(&tid[i],
NULL, /* default attributes please */
pull_one_url,
(void *)urls[i]);
if(0 != error)
fprintf(stderr, "Couldn't run thread number %d, errno %d\n", i, error);
else
fprintf(stderr, "Thread %d, gets %s\n", i, urls[i]);
}
/* now wait for all threads to terminate */
for(i=0; i< NUMT; i++) {
error = pthread_join(tid[i], NULL);
fprintf(stderr, "Thread %d terminated\n", i);
}
kill_locks();
return 0;
}