VaultPress - validate IP address

gistfile1.txt

function vaultpress_validate_ip_address( $rxs ) {
	$remote_ips = array();

	if ( !empty( $_SERVER['REMOTE_ADDR'] ) )
		$remote_ips[] = $_SERVER['REMOTE_ADDR'];
	if ( !empty( $_SERVER['HTTP_X_FORWARDED_FOR'] ) )
		$remote_ips[] = $_SERVER['HTTP_X_FORWARDED_FOR'];

	$iprx = '/^([0-9]+\.[0-9]+\.[0-9]+\.)([0-9]+)$/';

	foreach ( $remote_ips as $remote_ip ) {
		if ( !preg_match( $iprx, $remote_ip, $r ) ) {
			$__vp_validate_error = "remote_addr_fail";
			return false;
		}

		foreach ( (array)$rxs as $begin => $end ) {
			if ( !preg_match( $iprx, $begin, $b ) )
				continue;
			if ( !preg_match( $iprx, $end, $e ) )
				continue;
			if ( $r[1] != $b[1] || $r[1] != $e[1] )
				continue;
			$me = $r[2];
			$b = min( $b[2],$e[2] );
			$e = max( $b[2],$e[2] );
			if ( $me >= $b &&  $me <= $e ) {
				return true;
			}
		}
	}

	return false;
}