Force Login IP range exceptions

I tried replacing the x.x.x.x with x.x.x.x/24 and the rule fails.

That is because you tried to compare if an IP address equals an IP range –?which it doesn’t. The $_SERVER['REMOTE_ADDR'] function outputs the single IP address of the server under which the current script is executing.

It might be possible to do what you’re asking; you could try writing a new function that checks if the visitor’s IP address exists in your specified range(s) and return true or false; then use that function for the conditional statement.

See this thread for how to check an IP range in PHP:
https://stackoverflow.com/a/11121931/1062974

Also, you could try using your newly written function with the whitelist filter so it’s all done through your theme’s functions.php file instead of the actual plugin file; this way you don’t have to worry about new releases overwriting your changes.

Something like this:

/**
 * Filter Force Login to allow exceptions for specific IP range(s).
 *
 * @return array An array of URLs. Must be absolute.
 **/
function in_ipRange($visitor_ip) {
  // check if in range
    return true;
  else
    return false;
}
function my_forcelogin_whitelist() {
  // list of single page URLs
  $my_whitelist = array();
  // allow any page URL if within IP ranges
  if( in_ipRange($_SERVER['REMOTE_ADDR']) ) {
    $my_whitelist[] = site_url($_SERVER['REQUEST_URI']);
  }
  return $my_whitelist;
}
add_filter('v_forcelogin_whitelist', 'my_forcelogin_whitelist', 10, 1);