1 /***************************************************************************
3 * Project ___| | | | _ \| |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
8 * Copyright (C) 1998 - 2016, Daniel Stenberg, <daniel@haxx.se>, et al.
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.
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.
18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19 * KIND, either express or implied.
21 ***************************************************************************/
23 * Uses the CURLINFO_TLS_SESSION data.
27 /* Note that this example currently requires cURL to be linked against
28 GnuTLS (and this program must also be linked against -lgnutls). */
32 #include <curl/curl.h>
33 #include <gnutls/gnutls.h>
37 static size_t wrfu(void *ptr, size_t size, size_t nmemb, void *stream)
39 const struct curl_tlssessioninfo *info;
40 unsigned int cert_list_size;
41 const gnutls_datum_t *chainp;
47 res = curl_easy_getinfo(curl, CURLINFO_TLS_SESSION, &info);
50 switch(info->backend) {
51 case CURLSSLBACKEND_GNUTLS:
52 /* info->internals is now the gnutls_session_t */
53 chainp = gnutls_certificate_get_peers(info->internals, &cert_list_size);
54 if((chainp) && (cert_list_size)) {
57 for(i = 0; i < cert_list_size; i++) {
58 gnutls_x509_crt_t cert;
61 if(GNUTLS_E_SUCCESS == gnutls_x509_crt_init(&cert)) {
62 if(GNUTLS_E_SUCCESS ==
63 gnutls_x509_crt_import(cert, &chainp[i], GNUTLS_X509_FMT_DER)) {
64 if(GNUTLS_E_SUCCESS ==
65 gnutls_x509_crt_print(cert, GNUTLS_CRT_PRINT_FULL, &dn)) {
66 fprintf(stderr, "Certificate #%d: %.*s", i, dn.size, dn.data);
72 gnutls_x509_crt_deinit(cert);
77 case CURLSSLBACKEND_NONE:
88 curl_global_init(CURL_GLOBAL_DEFAULT);
90 curl = curl_easy_init();
92 curl_easy_setopt(curl, CURLOPT_URL, "https://www.example.com/");
94 curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, wrfu);
96 curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
97 curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);
99 curl_easy_setopt(curl, CURLOPT_VERBOSE, 0L);
101 (void) curl_easy_perform(curl);
103 curl_easy_cleanup(curl);
106 curl_global_cleanup();