NAME

       CURLOPT_DOH_SSL_VERIFYHOST - verify the hostname in the DoH SSL certificate

SYNOPSIS

       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_DOH_SSL_VERIFYHOST,
                                 long verify);

DESCRIPTION

       Pass  a  long  set  to  2L  as  asking  curl  to  verify the DoH (DNS-over-HTTPS) server's
       certificate name fields against the hostname.

       This option is the DoH equivalent of CURLOPT_SSL_VERIFYHOST(3) and only  affects  requests
       to the DoH server.

       When  CURLOPT_DOH_SSL_VERIFYHOST(3)  is  2, the SSL certificate provided by the DoH server
       must indicate that the server name is the same as the server name to which  you  meant  to
       connect to, or the connection fails.

       Curl  considers  the  DoH  server the intended one when the Common Name field or a Subject
       Alternate Name field in the certificate matches the hostname in the DoH URL to  which  you
       told Curl to connect.

       When  the  verify value is set to 1L it is treated the same as 2L. However for consistency
       with the other VERIFYHOST options we suggest use 2 and not 1.

       When the verify value is set to 0L, the connection succeeds regardless of the  names  used
       in the certificate. Use that ability with caution!

       See  also  CURLOPT_DOH_SSL_VERIFYPEER(3) to verify the digital signature of the DoH server
       certificate.

DEFAULT

       2

PROTOCOLS

       This functionality affects all TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc.

       All TLS backends support this option.

EXAMPLE

       int main(void)
       {
         CURL *curl = curl_easy_init();
         if(curl) {
           curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");

           curl_easy_setopt(curl, CURLOPT_DOH_URL,
                            "https://cloudflare-dns.com/dns-query");

           /* Disable host name verification of the DoH server */
           curl_easy_setopt(curl, CURLOPT_DOH_SSL_VERIFYHOST, 0L);

           curl_easy_perform(curl);
         }
       }

AVAILABILITY

       Added in curl 7.76.0

RETURN VALUE

       Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.

SEE ALSO

       CURLOPT_DOH_SSL_VERIFYPEER(3),                            CURLOPT_PROXY_SSL_VERIFYHOST(3),
       CURLOPT_PROXY_SSL_VERIFYPEER(3), CURLOPT_SSL_VERIFYHOST(3), CURLOPT_SSL_VERIFYPEER(3)