1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 1998 - 2013, 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 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
wrfu(void * ptr,size_t size,size_t nmemb,void * stream)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
main(void)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