113 lines
3.1 KiB
C
113 lines
3.1 KiB
C
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/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at https://curl.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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* SPDX-License-Identifier: curl
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*
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***************************************************************************/
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/* <DESC>
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* Uses the CURLINFO_TLS_SESSION data.
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* </DESC>
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*/
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/* Note that this example currently requires curl to be linked against
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GnuTLS (and this program must also be linked against -lgnutls). */
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#include <stdio.h>
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#include <curl/curl.h>
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#include <gnutls/gnutls.h>
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#include <gnutls/x509.h>
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static CURL *curl;
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static size_t wrfu(void *ptr, size_t size, size_t nmemb, void *stream)
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{
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const struct curl_tlssessioninfo *info;
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unsigned int cert_list_size;
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const gnutls_datum_t *chainp;
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CURLcode res;
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(void)stream;
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(void)ptr;
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res = curl_easy_getinfo(curl, CURLINFO_TLS_SESSION, &info);
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if(!res) {
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switch(info->backend) {
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case CURLSSLBACKEND_GNUTLS:
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/* info->internals is now the gnutls_session_t */
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chainp = gnutls_certificate_get_peers(info->internals, &cert_list_size);
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if((chainp) && (cert_list_size)) {
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unsigned int i;
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for(i = 0; i < cert_list_size; i++) {
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gnutls_x509_crt_t cert;
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gnutls_datum_t dn;
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if(GNUTLS_E_SUCCESS == gnutls_x509_crt_init(&cert)) {
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if(GNUTLS_E_SUCCESS ==
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gnutls_x509_crt_import(cert, &chainp[i], GNUTLS_X509_FMT_DER)) {
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if(GNUTLS_E_SUCCESS ==
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gnutls_x509_crt_print(cert, GNUTLS_CRT_PRINT_FULL, &dn)) {
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fprintf(stderr, "Certificate #%u: %.*s", i, dn.size, dn.data);
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gnutls_free(dn.data);
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}
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}
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gnutls_x509_crt_deinit(cert);
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}
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}
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}
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break;
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case CURLSSLBACKEND_NONE:
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default:
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break;
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}
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}
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return size * nmemb;
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}
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int main(void)
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{
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curl_global_init(CURL_GLOBAL_DEFAULT);
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curl = curl_easy_init();
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if(curl) {
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curl_easy_setopt(curl, CURLOPT_URL, "https://www.example.com/");
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curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, wrfu);
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curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
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curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);
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curl_easy_setopt(curl, CURLOPT_VERBOSE, 0L);
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(void) curl_easy_perform(curl);
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curl_easy_cleanup(curl);
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}
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curl_global_cleanup();
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return 0;
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}
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