Varnish hotlinking protection

varnish.vcl

sub hot_link {
    if (
        (
        req.http.host == "http://www.videoszoofilia.org" || 
        req.http.host == "http://videoszoofilia.org") &&
        req.url ~ "\.(js|css|jpg|jpeg|png|gif)$" &&
        (req.http.referer && 
            (req.http.referer !~ "^http://www.videoszoofilia.org/" && req.http.referer !~ "^http://videoszoofilia.org/"))
        ) {
            error 403 "No more hot linking";
        }
}

sub vcl_recv {
    call hot_link;
    ...
}