plucky (3) CURLOPT_DOH_SSL_VERIFYHOST.3.gz

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

       curl_easy_setopt(3) returns a CURLcode indicating success or error.

       CURLE_OK (0) means everything was OK, non-zero means an error occurred, see libcurl-errors(3).

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)