openport-scanner/index.js

A package that scans your local area network for given port in all hosts.

var net=require('net');
var Socket=net.Socket;
var os=require('os');
var interfaces=os.networkInterfaces();
module.exports=function(portno)
{
    var addresses=[];
    /*Getting IP addresses*/
    for (var k in interfaces) {
        for (var k2 in interfaces[k]) {
            var address = interfaces[k][k2];
            if (address.family === 'IPv4' && !address.internal) {
                addresses.push(address.address);
            }
        }
    }
    var LAN=addresses[0];
    var PORT=portno;
    LAN=LAN.substring(0,9);
    var checkPort=function(port, host, callback) 
    {
        var socket = new Socket(), status = null;
        socket.on('connect', function() {status = 'Open';socket.end();});
        socket.setTimeout(1500);// If no response, assume port is not listening
        socket.on('timeout', function() {status = 'Closed';socket.destroy();});
        socket.on('error', function(exception) {status = 'Closed';});
        socket.on('close', function(exception) {callback(null, status,host,port);});
        socket.connect(port, host);
    }
    for(var i=1; i <=255; i++)
    {
        checkPort(PORT, LAN+'.'+i, function(error, status, host, port)
        {
            if(error) console.log("Error - ",error);
            console.log("Port found on host : ", host, port, status);
        });
    }
}