1--- 2c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al. 3SPDX-License-Identifier: curl 4Title: CURLOPT_DOH_SSL_VERIFYHOST 5Section: 3 6Source: libcurl 7See-also: 8 - CURLOPT_DOH_SSL_VERIFYPEER (3) 9 - CURLOPT_PROXY_SSL_VERIFYHOST (3) 10 - CURLOPT_PROXY_SSL_VERIFYPEER (3) 11 - CURLOPT_SSL_VERIFYHOST (3) 12 - CURLOPT_SSL_VERIFYPEER (3) 13Protocol: 14 - TLS 15TLS-backend: 16 - All 17--- 18 19# NAME 20 21CURLOPT_DOH_SSL_VERIFYHOST - verify the hostname in the DoH SSL certificate 22 23# SYNOPSIS 24 25~~~c 26#include <curl/curl.h> 27 28CURLcode curl_easy_setopt(CURL *handle, CURLOPT_DOH_SSL_VERIFYHOST, 29 long verify); 30~~~ 31 32# DESCRIPTION 33 34Pass a long set to 2L as asking curl to *verify* the DoH (DNS-over-HTTPS) 35server's certificate name fields against the hostname. 36 37This option is the DoH equivalent of CURLOPT_SSL_VERIFYHOST(3) and 38only affects requests to the DoH server. 39 40When CURLOPT_DOH_SSL_VERIFYHOST(3) is 2, the SSL certificate provided by 41the DoH server must indicate that the server name is the same as the server 42name to which you meant to connect to, or the connection fails. 43 44Curl considers the DoH server the intended one when the Common Name field or a 45Subject Alternate Name field in the certificate matches the hostname in the 46DoH URL to which you told Curl to connect. 47 48When the *verify* value is set to 1L it is treated the same as 2L. However 49for consistency with the other *VERIFYHOST* options we suggest use 2 and 50not 1. 51 52When the *verify* value is set to 0L, the connection succeeds regardless of 53the names used in the certificate. Use that ability with caution! 54 55See also CURLOPT_DOH_SSL_VERIFYPEER(3) to verify the digital signature 56of the DoH server certificate. 57 58# DEFAULT 59 602 61 62# EXAMPLE 63 64~~~c 65int main(void) 66{ 67 CURL *curl = curl_easy_init(); 68 if(curl) { 69 curl_easy_setopt(curl, CURLOPT_URL, "https://example.com"); 70 71 curl_easy_setopt(curl, CURLOPT_DOH_URL, 72 "https://cloudflare-dns.com/dns-query"); 73 74 /* Disable host name verification of the DoH server */ 75 curl_easy_setopt(curl, CURLOPT_DOH_SSL_VERIFYHOST, 0L); 76 77 curl_easy_perform(curl); 78 } 79} 80~~~ 81 82# AVAILABILITY 83 84Added in 7.76.0 85 86If built TLS enabled. 87 88# RETURN VALUE 89 90Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not. 91