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Annotation of embedaddon/curl/docs/examples/sessioninfo.c, revision 1.1

1.1     ! misho       1: /***************************************************************************
        !             2:  *                                  _   _ ____  _
        !             3:  *  Project                     ___| | | |  _ \| |
        !             4:  *                             / __| | | | |_) | |
        !             5:  *                            | (__| |_| |  _ <| |___
        !             6:  *                             \___|\___/|_| \_\_____|
        !             7:  *
        !             8:  * Copyright (C) 1998 - 2020, 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:  * Uses the CURLINFO_TLS_SESSION data.
        !            24:  * </DESC>
        !            25:  */
        !            26: 
        !            27: /* Note that this example currently requires curl to be linked against
        !            28:    GnuTLS (and this program must also be linked against -lgnutls). */
        !            29: 
        !            30: #include <stdio.h>
        !            31: 
        !            32: #include <curl/curl.h>
        !            33: #include <gnutls/gnutls.h>
        !            34: #include <gnutls/x509.h>
        !            35: 
        !            36: static CURL *curl;
        !            37: 
        !            38: static size_t wrfu(void *ptr, size_t size, size_t nmemb, void *stream)
        !            39: {
        !            40:   const struct curl_tlssessioninfo *info;
        !            41:   unsigned int cert_list_size;
        !            42:   const gnutls_datum_t *chainp;
        !            43:   CURLcode res;
        !            44: 
        !            45:   (void)stream;
        !            46:   (void)ptr;
        !            47: 
        !            48:   res = curl_easy_getinfo(curl, CURLINFO_TLS_SESSION, &info);
        !            49: 
        !            50:   if(!res) {
        !            51:     switch(info->backend) {
        !            52:     case CURLSSLBACKEND_GNUTLS:
        !            53:       /* info->internals is now the gnutls_session_t */
        !            54:       chainp = gnutls_certificate_get_peers(info->internals, &cert_list_size);
        !            55:       if((chainp) && (cert_list_size)) {
        !            56:         unsigned int i;
        !            57: 
        !            58:         for(i = 0; i < cert_list_size; i++) {
        !            59:           gnutls_x509_crt_t cert;
        !            60:           gnutls_datum_t dn;
        !            61: 
        !            62:           if(GNUTLS_E_SUCCESS == gnutls_x509_crt_init(&cert)) {
        !            63:             if(GNUTLS_E_SUCCESS ==
        !            64:                gnutls_x509_crt_import(cert, &chainp[i], GNUTLS_X509_FMT_DER)) {
        !            65:               if(GNUTLS_E_SUCCESS ==
        !            66:                  gnutls_x509_crt_print(cert, GNUTLS_CRT_PRINT_FULL, &dn)) {
        !            67:                 fprintf(stderr, "Certificate #%u: %.*s", i, dn.size, dn.data);
        !            68: 
        !            69:                 gnutls_free(dn.data);
        !            70:               }
        !            71:             }
        !            72: 
        !            73:             gnutls_x509_crt_deinit(cert);
        !            74:           }
        !            75:         }
        !            76:       }
        !            77:       break;
        !            78:     case CURLSSLBACKEND_NONE:
        !            79:     default:
        !            80:       break;
        !            81:     }
        !            82:   }
        !            83: 
        !            84:   return size * nmemb;
        !            85: }
        !            86: 
        !            87: int main(void)
        !            88: {
        !            89:   curl_global_init(CURL_GLOBAL_DEFAULT);
        !            90: 
        !            91:   curl = curl_easy_init();
        !            92:   if(curl) {
        !            93:     curl_easy_setopt(curl, CURLOPT_URL, "https://www.example.com/");
        !            94: 
        !            95:     curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, wrfu);
        !            96: 
        !            97:     curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
        !            98:     curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);
        !            99: 
        !           100:     curl_easy_setopt(curl, CURLOPT_VERBOSE, 0L);
        !           101: 
        !           102:     (void) curl_easy_perform(curl);
        !           103: 
        !           104:     curl_easy_cleanup(curl);
        !           105:   }
        !           106: 
        !           107:   curl_global_cleanup();
        !           108: 
        !           109:   return 0;
        !           110: }