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    1: /***************************************************************************
    2:  *                                  _   _ ____  _
    3:  *  Project                     ___| | | |  _ \| |
    4:  *                             / __| | | | |_) | |
    5:  *                            | (__| |_| |  _ <| |___
    6:  *                             \___|\___/|_| \_\_____|
    7:  *
    8:  * Copyright (C) 1998 - 2017, 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:  * Extract lots of TLS certificate info.
   24:  * </DESC>
   25:  */
   26: #include <stdio.h>
   27: 
   28: #include <curl/curl.h>
   29: 
   30: static size_t wrfu(void *ptr,  size_t  size,  size_t  nmemb,  void *stream)
   31: {
   32:   (void)stream;
   33:   (void)ptr;
   34:   return size * nmemb;
   35: }
   36: 
   37: int main(void)
   38: {
   39:   CURL *curl;
   40:   CURLcode res;
   41: 
   42:   curl_global_init(CURL_GLOBAL_DEFAULT);
   43: 
   44:   curl = curl_easy_init();
   45:   if(curl) {
   46:     curl_easy_setopt(curl, CURLOPT_URL, "https://www.example.com/");
   47: 
   48:     curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, wrfu);
   49: 
   50:     curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
   51:     curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);
   52: 
   53:     curl_easy_setopt(curl, CURLOPT_VERBOSE, 0L);
   54:     curl_easy_setopt(curl, CURLOPT_CERTINFO, 1L);
   55: 
   56:     res = curl_easy_perform(curl);
   57: 
   58:     if(!res) {
   59:       struct curl_certinfo *certinfo;
   60: 
   61:       res = curl_easy_getinfo(curl, CURLINFO_CERTINFO, &certinfo);
   62: 
   63:       if(!res && certinfo) {
   64:         int i;
   65: 
   66:         printf("%d certs!\n", certinfo->num_of_certs);
   67: 
   68:         for(i = 0; i < certinfo->num_of_certs; i++) {
   69:           struct curl_slist *slist;
   70: 
   71:           for(slist = certinfo->certinfo[i]; slist; slist = slist->next)
   72:             printf("%s\n", slist->data);
   73: 
   74:         }
   75:       }
   76: 
   77:     }
   78: 
   79:     curl_easy_cleanup(curl);
   80:   }
   81: 
   82:   curl_global_cleanup();
   83: 
   84:   return 0;
   85: }