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      1 /***************************************************************************
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      6  *                             \___|\___/|_| \_\_____|
      7  *
      8  * Copyright (C) 1998 - 2013, Daniel Stenberg, <daniel (at) 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 
     23 /* Note that this example currently requires cURL to be linked against
     24    GnuTLS (and this program must also be linked against -lgnutls). */
     25 
     26 #include <stdio.h>
     27 
     28 #include <curl/curl.h>
     29 #include <gnutls/gnutls.h>
     30 
     31 static CURL *curl;
     32 
     33 static size_t wrfu(void *ptr, size_t size, size_t nmemb, void *stream)
     34 {
     35   const struct curl_tlssessioninfo *info;
     36   unsigned int cert_list_size;
     37   const gnutls_datum_t *chainp;
     38   CURLcode res;
     39 
     40   (void)stream;
     41   (void)ptr;
     42 
     43   res = curl_easy_getinfo(curl, CURLINFO_TLS_SESSION, &info);
     44 
     45   if(!res) {
     46     switch(info->backend) {
     47     case CURLSSLBACKEND_GNUTLS:
     48       /* info->internals is now the gnutls_session_t */
     49       chainp = gnutls_certificate_get_peers(info->internals, &cert_list_size);
     50       if((chainp) && (cert_list_size)) {
     51         unsigned int i;
     52 
     53         for(i = 0; i < cert_list_size; i++) {
     54           gnutls_x509_crt_t cert;
     55           gnutls_datum_t dn;
     56 
     57           if(GNUTLS_E_SUCCESS == gnutls_x509_crt_init(&cert)) {
     58             if(GNUTLS_E_SUCCESS ==
     59                gnutls_x509_crt_import(cert, &chainp[i], GNUTLS_X509_FMT_DER)) {
     60               if(GNUTLS_E_SUCCESS ==
     61                  gnutls_x509_crt_print(cert, GNUTLS_CRT_PRINT_FULL, &dn)) {
     62                 fprintf(stderr, "Certificate #%d: %.*s", i, dn.size, dn.data);
     63 
     64                 gnutls_free(dn.data);
     65               }
     66             }
     67 
     68             gnutls_x509_crt_deinit(cert);
     69           }
     70         }
     71       }
     72       break;
     73     case CURLSSLBACKEND_NONE:
     74     default:
     75       break;
     76     }
     77   }
     78 
     79   return size * nmemb;
     80 }
     81 
     82 int main(void)
     83 {
     84   curl_global_init(CURL_GLOBAL_DEFAULT);
     85 
     86   curl = curl_easy_init();
     87   if(curl) {
     88     curl_easy_setopt(curl, CURLOPT_URL, "https://www.example.com/");
     89 
     90     curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, wrfu);
     91 
     92     curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
     93     curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);
     94 
     95     curl_easy_setopt(curl, CURLOPT_VERBOSE, 0L);
     96 
     97     (void) curl_easy_perform(curl);
     98 
     99     curl_easy_cleanup(curl);
    100   }
    101 
    102   curl_global_cleanup();
    103 
    104   return 0;
    105 }
    106