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Annotation of embedaddon/curl/docs/examples/threaded-ssl.c, revision 1.1

1.1     ! misho       1: /***************************************************************************
        !             2:  *                                  _   _ ____  _
        !             3:  *  Project                     ___| | | |  _ \| |
        !             4:  *                             / __| | | | |_) | |
        !             5:  *                            | (__| |_| |  _ <| |___
        !             6:  *                             \___|\___/|_| \_\_____|
        !             7:  *
        !             8:  * Copyright (C) 1998 - 2019, 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:  * Show the required mutex callback setups for GnuTLS and OpenSSL when using
        !            24:  * libcurl multi-threaded.
        !            25:  * </DESC>
        !            26:  */
        !            27: /* A multi-threaded example that uses pthreads and fetches 4 remote files at
        !            28:  * once over HTTPS. The lock callbacks and stuff assume OpenSSL <1.1 or GnuTLS
        !            29:  * (libgcrypt) so far.
        !            30:  *
        !            31:  * OpenSSL docs for this:
        !            32:  *   https://www.openssl.org/docs/man1.0.2/man3/CRYPTO_num_locks.html
        !            33:  * gcrypt docs for this:
        !            34:  *   https://gnupg.org/documentation/manuals/gcrypt/Multi_002dThreading.html
        !            35:  */
        !            36: 
        !            37: #define USE_OPENSSL /* or USE_GNUTLS accordingly */
        !            38: 
        !            39: #include <stdio.h>
        !            40: #include <pthread.h>
        !            41: #include <curl/curl.h>
        !            42: 
        !            43: #define NUMT 4
        !            44: 
        !            45: /* we have this global to let the callback get easy access to it */
        !            46: static pthread_mutex_t *lockarray;
        !            47: 
        !            48: #ifdef USE_OPENSSL
        !            49: #include <openssl/crypto.h>
        !            50: static void lock_callback(int mode, int type, char *file, int line)
        !            51: {
        !            52:   (void)file;
        !            53:   (void)line;
        !            54:   if(mode & CRYPTO_LOCK) {
        !            55:     pthread_mutex_lock(&(lockarray[type]));
        !            56:   }
        !            57:   else {
        !            58:     pthread_mutex_unlock(&(lockarray[type]));
        !            59:   }
        !            60: }
        !            61: 
        !            62: static unsigned long thread_id(void)
        !            63: {
        !            64:   unsigned long ret;
        !            65: 
        !            66:   ret = (unsigned long)pthread_self();
        !            67:   return ret;
        !            68: }
        !            69: 
        !            70: static void init_locks(void)
        !            71: {
        !            72:   int i;
        !            73: 
        !            74:   lockarray = (pthread_mutex_t *)OPENSSL_malloc(CRYPTO_num_locks() *
        !            75:                                                 sizeof(pthread_mutex_t));
        !            76:   for(i = 0; i<CRYPTO_num_locks(); i++) {
        !            77:     pthread_mutex_init(&(lockarray[i]), NULL);
        !            78:   }
        !            79: 
        !            80:   CRYPTO_set_id_callback((unsigned long (*)())thread_id);
        !            81:   CRYPTO_set_locking_callback((void (*)())lock_callback);
        !            82: }
        !            83: 
        !            84: static void kill_locks(void)
        !            85: {
        !            86:   int i;
        !            87: 
        !            88:   CRYPTO_set_locking_callback(NULL);
        !            89:   for(i = 0; i<CRYPTO_num_locks(); i++)
        !            90:     pthread_mutex_destroy(&(lockarray[i]));
        !            91: 
        !            92:   OPENSSL_free(lockarray);
        !            93: }
        !            94: #endif
        !            95: 
        !            96: #ifdef USE_GNUTLS
        !            97: #include <gcrypt.h>
        !            98: #include <errno.h>
        !            99: 
        !           100: GCRY_THREAD_OPTION_PTHREAD_IMPL;
        !           101: 
        !           102: void init_locks(void)
        !           103: {
        !           104:   gcry_control(GCRYCTL_SET_THREAD_CBS);
        !           105: }
        !           106: 
        !           107: #define kill_locks()
        !           108: #endif
        !           109: 
        !           110: /* List of URLs to fetch.*/
        !           111: const char * const urls[]= {
        !           112:   "https://www.example.com/",
        !           113:   "https://www2.example.com/",
        !           114:   "https://www3.example.com/",
        !           115:   "https://www4.example.com/",
        !           116: };
        !           117: 
        !           118: static void *pull_one_url(void *url)
        !           119: {
        !           120:   CURL *curl;
        !           121: 
        !           122:   curl = curl_easy_init();
        !           123:   curl_easy_setopt(curl, CURLOPT_URL, url);
        !           124:   /* this example doesn't verify the server's certificate, which means we
        !           125:      might be downloading stuff from an impostor */
        !           126:   curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
        !           127:   curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);
        !           128:   curl_easy_perform(curl); /* ignores error */
        !           129:   curl_easy_cleanup(curl);
        !           130: 
        !           131:   return NULL;
        !           132: }
        !           133: 
        !           134: int main(int argc, char **argv)
        !           135: {
        !           136:   pthread_t tid[NUMT];
        !           137:   int i;
        !           138:   (void)argc; /* we don't use any arguments in this example */
        !           139:   (void)argv;
        !           140: 
        !           141:   /* Must initialize libcurl before any threads are started */
        !           142:   curl_global_init(CURL_GLOBAL_ALL);
        !           143: 
        !           144:   init_locks();
        !           145: 
        !           146:   for(i = 0; i< NUMT; i++) {
        !           147:     int error = pthread_create(&tid[i],
        !           148:                                NULL, /* default attributes please */
        !           149:                                pull_one_url,
        !           150:                                (void *)urls[i]);
        !           151:     if(0 != error)
        !           152:       fprintf(stderr, "Couldn't run thread number %d, errno %d\n", i, error);
        !           153:     else
        !           154:       fprintf(stderr, "Thread %d, gets %s\n", i, urls[i]);
        !           155:   }
        !           156: 
        !           157:   /* now wait for all threads to terminate */
        !           158:   for(i = 0; i< NUMT; i++) {
        !           159:     pthread_join(tid[i], NULL);
        !           160:     fprintf(stderr, "Thread %d terminated\n", i);
        !           161:   }
        !           162: 
        !           163:   kill_locks();
        !           164: 
        !           165:   return 0;
        !           166: }