function getip(req) {
  var headerip = req.headers ? getheaderip(req) : 'unknown'
  if (headerip.length > 15) {headerip = headerip.match(/\d+\.\d+\.\d+\.\d/g)[0]}
  return headerip
  function getheaderip(req) {
    return req.headers['x-forwarded-for']
    ? req.headers['x-forwarded-for']
    : (req.connection && req.connection.remoteAddress)
    ? req.connection.remoteAddress
    : (req.connection.socket && req.connection.socket.remoteAddress)
    ? req.connection.socket.remoteAddress
    : (req.socket && req.socket.remoteAddress)
    ? req.socket.remoteAddress
    : '0.0.0.0';
  }
}