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

       int main(void)
       {
         CURL *curl = curl_easy_init();
         if(curl) {
           CURLcode res;
           curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/foo.bin");
           curl_easy_setopt(curl, CURLOPT_DNS_INTERFACE, "eth0");
           res = 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_LOCAL_IP4(3), CURLOPT_DNS_LOCAL_IP6(3), CURLOPT_DNS_SERVERS(3), CURLOPT_INTERFACE(3)