WIP unpack question and resource records
This commit is contained in:
AJ ONeal
parent
2f4807d1b4
commit
633e60d643
120
bin/debug.js
120
bin/debug.js
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@ -5,7 +5,7 @@ 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 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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@ -19,36 +19,130 @@ 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 flags = dv.getUint16(2, false);
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console.log('header 0x', flags.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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+ 'qr ' + ((flags & 0x8000) >> 15) + ', '
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+ 'opcode ' + ((flags & 0x7800) >> 11) + ', '
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+ 'aa ' + ((flags & 0x400) >> 10) + ', '
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+ 'tc ' + ((flags & 0x200) >> 9) + ', '
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+ 'rd ' + ((flags & 0x100) >> 8) + ', '
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+ 'ra ' + ((flags & 0x80) >> 7) + ', '
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+ 'res1 ' + ((flags & 0x40) >> 6) + ', '
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+ 'res2 ' + ((flags & 0x20) >> 5) + ', '
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+ 'res3 ' + ((flags & 0x10) >> 4) + ', '
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+ 'rcode ' + ((flags & 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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var 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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var total = 12;
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function unpackQuestion(dv, total, len) {
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var qnames = [];
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var labelLen;
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while (true) {
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if (total >= len) {
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break;
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}
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labelLen = dv.getUint8(total, false); // additional count
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total += 1;
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if (!labelLen) {
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break;
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}
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if (192 === labelLen) {
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console.log('ERROR: Compression pointer found');
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console.log(dv.getUint8(total, false));
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console.log(dv.getUint8(dv.getUint8(total + 0, false), false));
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console.log(dv.getUint8(dv.getUint8(total + 1, false), false));
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console.log(dv.getUint8(dv.getUint8(total + 2, false), false));
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break;
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}
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var i;
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var label = '';
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console.log('label len', labelLen);
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for (i = 0; i < labelLen; i += 1) {
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label += String.fromCharCode(dv.getUint8(total + i, false));
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}
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total += label.length;
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console.log('label:', label);
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qnames.push(label);
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}
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console.log('QNAME:', qnames.join('.'));
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console.log('QTYPE:', dv.getUint16(total), false);
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total += 2;
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console.log('QCLASS:', dv.getUint16(total), false);
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total += 2;
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return {
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total: total
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, qname: qnames.join('.')
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};
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}
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var q = { total: total };
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function mapChar(ch) { return String.fromCharCode(ch) + '(' + ch + ')'; }
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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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for (count = 0; count < qdcount; count += 1) {
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console.log('Question', count + 1, 'of', qdcount);
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q = unpackQuestion(dv, q.total, ab.byteLength);
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console.log('');
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}
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console.log('');
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console.log('//////////////////');
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console.log('// ANSWER //');
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console.log('//////////////////');
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console.log('');
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for (count = 0; count < ancount; count += 1) {
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console.log('Answer', count + 1, 'of', ancount);
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q = unpackQuestion(dv, q.total, ab.byteLength);
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console.log('');
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}
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console.log('');
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console.log('//////////////////');
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console.log('// AUTHORITY //');
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console.log('//////////////////');
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console.log('');
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for (count = 0; count < nscount; count += 1) {
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console.log('Authority', count + 1, 'of', nscount);
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q = unpackQuestion(dv, q.total, ab.byteLength);
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console.log('ttl:', dv.getUint32(q.total, false));
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q.total += 4;
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q.rdlength = dv.getUint16(q.total, false);
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console.log('rdlen:', q.rdlength);
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q.total += 2;
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console.log('rrdata:');
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console.log([].slice.call(new Uint8Array(ab), q.total, q.total + q.rdlength).map(mapChar));
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q.total += q.rdlength;
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}
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console.log('');
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console.log('//////////////////');
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console.log('// ADDITIONAL //');
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console.log('//////////////////');
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console.log('');
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for (count = 0; count < arcount; count += 1) {
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console.log('Additional', count + 1, 'of', arcount);
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q = unpackQuestion(dv, q.total, ab.byteLength);
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console.log('');
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}
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}());
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