bind to 127.0.0.1 about cap HOT 8 CLOSED

device = Cap.findDevice('127.0.0.1')
console.log(device)

$ sudo node foo.js
/private/tmp/foo.js:11
var linkType = c.open(device, filter, bufSize, buffer);
                 ^

TypeError: device must be a string
    at TypeError (native)
    at Object.<anonymous> (/private/tmp/foo.js:11:18)
    at Module._compile (module.js:434:26)
    at Object.Module._extensions..js (module.js:452:10)
    at Module.load (module.js:355:32)
    at Function.Module._load (module.js:310:12)
    at Function.Module.runMain (module.js:475:10)
    at startup (node.js:117:18)
    at node.js:951:3

var Cap = require('cap').Cap,
    decoders = require('cap').decoders,
    PROTOCOL = decoders.PROTOCOL;

var c = new Cap(),
    device = Cap.findDevice('127.0.0.1'),
    filter = 'tcp and dst port 80',
    bufSize = 10 * 1024 * 1024,
    buffer = new Buffer(65535);

var linkType = c.open(device, filter, bufSize, buffer);

c.setMinBytes && c.setMinBytes(0);

c.on('packet', function(nbytes, trunc) {
  console.log('packet: length ' + nbytes + ' bytes, truncated? '
              + (trunc ? 'yes' : 'no'));

  // raw packet data === buffer.slice(0, nbytes)

  if (linkType === 'ETHERNET') {
    var ret = decoders.Ethernet(buffer);

    if (ret.info.type === PROTOCOL.ETHERNET.IPV4) {
      console.log('Decoding IPv4 ...');

      ret = decoders.IPV4(buffer, ret.offset);
      console.log('from: ' + ret.info.srcaddr + ' to ' + ret.info.dstaddr);

      if (ret.info.protocol === PROTOCOL.IP.TCP) {
        var datalen = ret.info.totallen - ret.hdrlen;

        console.log('Decoding TCP ...');

        ret = decoders.TCP(buffer, ret.offset);
        console.log(' from port: ' + ret.info.srcport + ' to port: ' + ret.info.dstport);
        datalen -= ret.hdrlen;
        console.log(buffer.toString('binary', ret.offset, ret.offset + datalen));
      } else if (ret.info.protocol === PROTOCOL.IP.UDP) {
        console.log('Decoding UDP ...');

        ret = decoders.UDP(buffer, ret.offset);
        console.log(' from port: ' + ret.info.srcport + ' to port: ' + ret.info.dstport);
        console.log(buffer.toString('binary', ret.offset, ret.offset + ret.info.length));
      } else
        console.log('Unsupported IPv4 protocol: ' + PROTOCOL.IP[ret.info.protocol]);
    } else
      console.log('Unsupported Ethertype: ' + PROTOCOL.ETHERNET[ret.info.type]);
  }
});