BIND11

bind11.js

var net = require('net');
var dgram = require('dgram');

function ntohs(arr) {
  return ((arr[0] & 0xFF) << 8) | (arr[1] & 0xFF);
}

function parse_name(data, pos)
{
  for (base = pos; pos < data.length;) {
    if (data[pos] == 0) {
      return data.slice(base, pos + 1)
    }
    if (data[pos] > 64) {
        throw "hackz label"; // SAFETY FIRST
    }
    pos += data[pos] + 1;
  }
}

function parse_query(data, pos)
{
  qst = {}
  qst.qname = parse_name(data, pos)
  pos += qst.qname.length
  qst.qtype = ntohs(data.slice(pos, pos + 2))
  pos += 2
  qst.qclass = ntohs(data.slice(pos, pos + 2))
  return qst;
}

function resolve(data, len)
{
    data[2] = 0x81 + 0x04;
    data[3] = 0x05;

    try {
      // parse header + query
      qst = parse_query(data, 12)
      // fuck ANY
      if (qst.qtype == 0xFF) {
        data[3] = 0x04;
      }
      // TODO: parse /etc/hosts
    } catch (err) {
      console.trace(err)
      data[3] = 0x02; // SERVFAIL
    }
    return len;
}

var tcp = net.createServer(function (socket) {
  socket.on('data', function (data) {
    var len = ntohs(data.slice(0, 2));
    resolve(data.slice(2), len);
    socket.write(data);
  });
});
var udp = dgram.createSocket('udp6');
udp.on('message', function (message, remote) {
  var len = resolve(message, message.length);
  udp.send(message, 0, len, remote.port, remote.address);
});

tcp.listen(5355, '::');
udp.bind(5355, '::');

I love this! ;-)

What about an UDP version, now? :-)

I like the variety of possible rcodes...

I aim to please. UDP version now + "Happy Eyeballs". Performance on par with BIND9 on my localhost.

Wow, most paying software do not implement so quickly what I ask for!