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" hostname
26 * </DESC>
27 */
28 #include <stdio.h>
29 #include <curl/curl.h>
30
main(void)31 int 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 resolves and uses example.com:443 but in other
43 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 fails, 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 (most likely) causes a 404 or similar because it sends
60 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
