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 }
86