NAME

       CURLOPT_DNS_INTERFACE - interface to speak DNS over

SYNOPSIS

       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_DNS_INTERFACE, char *ifname);

DESCRIPTION

       Pass  a  char  * as parameter. Set the name of the network interface that the DNS resolver
       should bind to. This must be an interface name (not an address). Set this option  to  NULL
       to use the default setting (do not bind to a specific interface).

       The application does not have to keep the string around after setting this option.

DEFAULT

       NULL

PROTOCOLS

       All protocols except file:// - protocols that resolve host names.

EXAMPLE

       CURL *curl = curl_easy_init();
       if(curl) {
         curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/foo.bin");
         curl_easy_setopt(curl, CURLOPT_DNS_INTERFACE, "eth0");
         ret = curl_easy_perform(curl);
         curl_easy_cleanup(curl);
       }

AVAILABILITY

       Added  in 7.33.0. This option also requires that libcurl was built with a resolver backend
       that supports this operation. The c-ares backend is the only such one.

RETURN VALUE

       Returns  CURLE_OK  if  the  option  is  supported,   CURLE_UNKNOWN_OPTION   if   not,   or
       CURLE_NOT_BUILT_IN if support was disabled at compile-time.

SEE ALSO

       CURLOPT_DNS_SERVERS(3), CURLOPT_DNS_LOCAL_IP4(3),