1/*************************************************************************** 2 * _ _ ____ _ 3 * Project ___| | | | _ \| | 4 * / __| | | | |_) | | 5 * | (__| |_| | _ <| |___ 6 * \___|\___/|_| \_\_____| 7 * 8 * Copyright (C) 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.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 * SPDX-License-Identifier: curl 22 * 23 ***************************************************************************/ 24/* <DESC> 25 * Use CURLOPT_CONNECT_TO to connect to "wrong" host name 26 * </DESC> 27 */ 28#include <stdio.h> 29#include <curl/curl.h> 30 31int main(void) 32{ 33 CURL *curl; 34 CURLcode res = CURLE_OK; 35 36 /* 37 Each single string should be written using the format 38 HOST:PORT:CONNECT-TO-HOST:CONNECT-TO-PORT where HOST is the host of the 39 request, PORT is the port of the request, CONNECT-TO-HOST is the host name 40 to connect to, and CONNECT-TO-PORT is the port to connect to. 41 */ 42 /* instead of curl.se:443, it will resolve and use example.com:443 but in 43 other aspects work as if it still is curl.se */ 44 struct curl_slist *host = curl_slist_append(NULL, 45 "curl.se:443:example.com:443"); 46 47 curl = curl_easy_init(); 48 if(curl) { 49 curl_easy_setopt(curl, CURLOPT_CONNECT_TO, host); 50 curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L); 51 curl_easy_setopt(curl, CURLOPT_URL, "https://curl.se/"); 52 53 /* since this connects to the wrong host, checking the host name in the 54 server certificate will fail, so unless we disable the check libcurl 55 returns CURLE_PEER_FAILED_VERIFICATION */ 56 curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L); 57 58 /* Letting the wrong host name in the certificate be okay, the transfer 59 goes through but will (most likely) cause a 404 or similar because it 60 sends an unknown name in the Host: header field */ 61 res = curl_easy_perform(curl); 62 63 /* always cleanup */ 64 curl_easy_cleanup(curl); 65 } 66 67 curl_slist_free_all(host); 68 69 return (int)res; 70} 71