var webSocketPort=20;
var fs = require('fs'),
crypto = require('crypto'),
inspect = require('util').inspect;
var buffersEqual = require('buffer-equal-constant-time'),
ssh2 = require('ssh2'),
utils = ssh2.utils;

var pubKey = utils.genPublicKey(utils.parseKey(fs.readFileSync('C:\Program         Files\OpenSSH\etc\ssh_host_rsa_key.pub')));

new ssh2.Server({
hostKeys: [fs.readFileSync('C:\Program   Files\OpenSSH\etc\ssh_host_rsa_key')]
 }, function(client) {
console.log('Client connected!',client);
client.on('authentication', function(ctx) {
if (ctx.method === 'password'
    || ctx.username === '418374'
    || ctx.password === 'hiandroid8@3') {
  ctx.accept();
  console.log("inside userpwd")
}
else if (ctx.method === 'publickey'
         && ctx.key.algo === pubKey.fulltype
         && buffersEqual(ctx.key.data, pubKey.public)) {
    console.log("inside publicKey")
  if (ctx.signature) {
      console.log("inside signature")
    var verifier = crypto.createVerify(ctx.sigAlgo);
    verifier.update(ctx.blob);
    if (verifier.verify(pubKey.publicOrig, ctx.signature))
      ctx.accept();
    else
      ctx.reject();
  } else {
      console.log("inside nthing")
    // if no signature present, that means the client is just checking
    // the validity of the given public key
    ctx.accept();
  }
} else
  ctx.reject();
  }).on('ready', function() {
 console.log('Client authenticated!');
 client.on('session', function(accept, reject) {
    console.log('Client Sssio!');
   var session = accept();
  session.once('exec', function(accept, reject, info) {
    console.log('Client wants to execute: ' + inspect(info.command));
    var stream = accept();
    stream.stderr.write('Oh no, the dreaded errors!n');
    stream.write('Just kidding about the errors!n');
    stream.exit(0);
    stream.end();
  });
});
client.on('request', function(accept, reject, name,info,a) {
    console.log('accept',accept)
    console.log('reject',reject)
    console.log('info',info)
    console.log('name',name)
    if(name==="tcpip-forward"){
        //info.bindAddr='localhost';
    }
    console.log('infoafgter',info)
  var session = accept();
    console.log('tcpIp');
  })
  }).on('error',function(e){
  console.log("error occcured",e)
  }).on('end', function() {
   console.log('Client disconnected');
  });
 }).listen(webSocketPort, '0.0.0.0', function() {
console.log('Listening on port ' + webSocketPort);
});