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Annotation of embedaddon/curl/docs/examples/threaded-ssl.c, revision 1.1.1.1

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: }