Find MAC address by IP

findmac.js

// node findmac.js 10.10.2.255 c4-01-7c-3d-b8-40

const exec = require('child_process').exec;

// http://thebackroomtech.com/2010/08/22/determine-ip-address-from-a-mac-address/
var broadcast = process.argv[2]
  , mac = process.argv[3]
  , targetIP = '';

if (!broadcast) {
  console.error('Broadcast ip is required.')
  return;
}

if (!mac) {
  console.error('MAC is required.')
  return;
}

console.log('ping ' + broadcast);
exec('ping ' + broadcast, function(error, stdout, stderr) {
  if (error) {
    console.error(error);
    return;
  }
  
  console.log('arp -a');
  exec('arp -a', function(err, stdout, stderr) {
    if (err) {
      console.error(err)
    }

    stdout = stdout.split(/\r\n/);

    for (var i = 0; i < stdout.length; i++) {

      if (new RegExp(mac).test(stdout[i])) {

        console.log('Find it:' + stdout[i]);
        targetIP = stdout[i].match(/\d+\.\d+\.\d+.\d+/)[0];
        break;
      }
    }

    if (targetIP) {
      console.log('targetIP: ' + targetIP)
      // open explorer share.
      //targetIP = '10.10.2.18'
      //exec('explorer \\\\' + targetIP)
    } else {
      console.log('No such MAC.')
    }
    
  })
});