dns server that directs all traffic to the machine its on

gistfile1.js

# requires https://github.com/tjfontaine/node-dns

var os = require('os')
var dns = require('native-dns');
var server = dns.createServer();

var port = 53;
var interfaces = os.networkInterfaces();
var addresses = [];
for (k in interfaces) {
    for (k2 in interfaces[k]) {
        var address = interfaces[k][k2];
        if (address.family == 'IPv4' && !address.internal) {
            addresses.push(address.address)
        }
    }
}

if (addresses.length < 1) {
  console.error("No IP address found");
}
var address = addresses[0];
if (addresses.length > 1) {
  console.log("more than 1 IP address found: " + addresses);
  console.log("using: " + address);
}

server.on('request', function (request, response) {
  response.answer.push(dns.A({
    name: request.question[0].name,
    address: address,
    ttl: 1,
  }));
  response.send();
});

server.on('error', function (err, buff, req, res) {
  console.log(err.stack);
});

try {
  server.serve(port);
} catch (e) {
  console.error(e);
}