55 lines
1.4 KiB
JavaScript
55 lines
1.4 KiB
JavaScript
(function () {
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'use strict';
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var input = process.argv[2];
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var fs = require('fs');
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var nb = fs.readFileSync(input, null);
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var ab = nb.buffer.slice(nb.byteOffset, nb.byteOffset + nb.byteLength)
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var dv = new DataView(ab);
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//
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// read header
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//
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console.log('');
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console.log('//////////////////');
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console.log('// HEADER //');
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console.log('//////////////////');
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console.log('');
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console.log('id (int)', dv.getUint16(0));
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var i = dv.getUint16(2, false);
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console.log('header 0x', i.toString(16));
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var flagsstr = ''
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+ 'qr ' + ((i & 0x8000) >> 15) + ', '
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+ 'opcode ' + ((i & 0x7800) >> 11) + ', '
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+ 'aa ' + ((i & 0x400) >> 10) + ', '
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+ 'tc ' + ((i & 0x200) >> 9) + ', '
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+ 'rd ' + ((i & 0x100) >> 8) + ', '
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+ 'ra ' + ((i & 0x80) >> 7) + ', '
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+ 'res1 ' + ((i & 0x40) >> 6) + ', '
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+ 'res2 ' + ((i & 0x20) >> 5) + ', '
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+ 'res3 ' + ((i & 0x10) >> 4) + ', '
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+ 'rcode ' + ((i & 0xF));
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console.log('(flags: ' + flagsstr);
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var qdcount = dv.getUint16(4, false); // query count
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var ancount = dv.getUint16(6, false); // answer count
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var nscount = dv.getUint16(8, false); // authority count
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var arcount = dv.getUint16(10, false); // additional count
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console.log('qdcount', qdcount);
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console.log('ancount', ancount);
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console.log('nscount', nscount);
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console.log('arcount', arcount);
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console.log('');
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console.log('//////////////////');
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console.log('// QUESTION //');
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console.log('//////////////////');
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console.log('');
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}());
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