dns-suite.js/bin/dns-pack.js

#!/usr/bin/env node
'use strict';

// EXAMPLE:
// node bin/dns-parse.js samples/a-0.mdns.bin

var path = require('path');
// pass a terminal arg
var filename = process.argv[2];
var outname = process.argv[3];
if (!filename) {
  console.error("Usage: node bin/dns-pack.js <path/to/sample.json> <path/to/output.bin>");
  console.error("Example: node bin/dns-pack.js ./samples/services-0.mdns.json ./services-0.mdns.bin");
  process.exit(1);
  return;
}
if (!outname) {
  console.warn('');
  console.warn(
    "Usage: node bin/dns-pack.js '" + filename + "' './" + path.basename(filename).replace(path.extname(filename), '') + ".bin'"
  );
  console.warn('');
}


var PromiseA = require('bluebird');
var fs = PromiseA.promisifyAll(require('fs'));
var dnsjs = require('../').DNSPacket;

fs.readFileAsync(filename, null).then(function (nb) {
  //
  // current reference impl
  //
  //console.log(require('native-dns-packet').parse(nb));


  //
  // other reference impl
  //
  //console.log(require('dns-js').DNSPacket.parse(nb));

  // nb is a Uint8Array (ArrayBufferView) for nb.buffer
  // nb.buffer is the actual ArrayBuffer

  //var ab = nb.buffer.slice(nb.byteOffset, nb.byteOffset + nb.byteLength);
  var packet = dnsjs.write(JSON.parse(nb.toString('ascii')));

  //console.log('[packet]', nb.byteLength, 'bytes:');
  //console.log(JSON.stringify(packet, null, 2));

  //TODO hexdump packet
  var hexdump = require('hexdump.js').hexdump;
  var str = hexdump(packet);

  console.log(str);

  if (outname) {
    fs.writeFileSync(outname, packet, null);
    console.log('');
    console.log("wrote '" + outname + "'");
  }
});