coolaj86
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dns-suite.js
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WIP add cp, add server

This commit is contained in:
AJ ONeal 2017-10-09 12:39:46 -06:00
parent b5af1bfe24
commit 5fff05a76f
2 changed files with 120 additions and 25 deletions
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100
bin/debug.js
View File

@ -1,3 +1,8 @@
#!/usr/bin/env node
// node bin/debug.js ../dig.js/blar.DOEsNteXiST.AJ.OnEal.DAplIE.me.any.0.bin
// node bin/debugd.js ../dig.js/blar.DOEsNteXiST.AJ.OnEal.DAplIE.me.any.0.bin
// dig @localhost -p 65053 ANY DOEsNteXiST.AJ.OnEal.DAplIE.me
(function () { (function () {
'use strict'; 'use strict';
@ -17,6 +22,10 @@ console.log('// HEADER //');
console.log('//////////////////'); console.log('//////////////////');
console.log(''); console.log('');
console.log('');
console.log('byte index 0x00');
console.log('');
console.log('id (int)', dv.getUint16(0)); console.log('id (int)', dv.getUint16(0));
var flags = dv.getUint16(2, false); var flags = dv.getUint16(2, false);
@ -45,9 +54,14 @@ console.log('ancount', ancount);
console.log('nscount', nscount); console.log('nscount', nscount);
console.log('arcount', arcount); console.log('arcount', arcount);
function unpackQuestion(dv, total, len) { function unpackQuestionLabels(opts) {
var dv = opts.dv;
//var origTotal = opts.total;
var total = opts.total;
var len = opts.len;
var qnames = []; var qnames = [];
var labelLen; var labelLen;
while (true) { while (true) {
if (total >= len) { if (total >= len) {
break; break;
@ -58,29 +72,46 @@ function unpackQuestion(dv, total, len) {
break; break;
} }
if (192 === labelLen) { if (192 === labelLen) {
console.log('ERROR: Compression pointer found'); var pointer = dv.getUint8(total, false);
console.log(dv.getUint8(total, false)); console.log('Found a pointer to'
console.log(dv.getUint8(dv.getUint8(total + 0, false), false)); + ' 0x' + pointer.toString(16) + ' (' + pointer + ')'
console.log(dv.getUint8(dv.getUint8(total + 1, false), false)); + ' at byte index'
console.log(dv.getUint8(dv.getUint8(total + 2, false), false)); + ' 0x' + leftPad(total.toString(16)) + ' (' + total + ')'
+ ' which back-references:'
);
console.log('-4', dv.getUint8(pointer - 4, false));
console.log('-3', dv.getUint8(pointer - 3, false));
console.log('-2', dv.getUint8(pointer - 2, false));
console.log('-1', dv.getUint8(pointer - 1, false));
console.log(' 0', dv.getUint8(pointer + 0, false));
console.log('+1', dv.getUint8(pointer + 1, false));
console.log('+2', dv.getUint8(pointer + 2, false));
console.log('bytes near the pointer itself (not what it points to) are:');
console.log('-2', dv.getUint8(total - 2, false));
console.log('-1', dv.getUint8(total - 1, false));
console.log(' 0', dv.getUint8(total + 0, false));
console.log('+1', dv.getUint8(total + 1, false));
console.log('+2', dv.getUint8(total + 2, false));
console.log('+3', dv.getUint8(total + 3, false));
console.log('+4', dv.getUint8(total + 4, false));
//total += 1;
opts.cp = true;
qnames.push(unpackQuestionLabels({ dv: dv, total: pointer, len: len }).qname);
total += 1;
break; break;
} else {
var i;
var label = '';
console.log('label len', labelLen);
for (i = 0; i < labelLen; i += 1) {
//console.log('total:', total, i);
label += String.fromCharCode(dv.getUint8(total + i, false));
}
total += label.length;
console.log('label:', label);
qnames.push(label);
} }
var i;
var label = '';
console.log('label len', labelLen);
for (i = 0; i < labelLen; i += 1) {
label += String.fromCharCode(dv.getUint8(total + i, false));
}
total += label.length;
console.log('label:', label);
qnames.push(label);
} }
// leading length and (potentially) trailing null
console.log('QNAME (len ' + (qnames.join('.').length + 1 + (labelLen ? 0 : 1)) + '):', qnames.join('.'));
console.log('QTYPE (len 2):', dv.getUint16(total, false));
total += 2;
console.log('QCLASS (len 2):', dv.getUint16(total, false));
total += 2;
return { return {
total: total total: total
@ -88,8 +119,23 @@ function unpackQuestion(dv, total, len) {
}; };
} }
function unpackQuestion(dv, total, len) {
var result = unpackQuestionLabels({ dv: dv, total: total, len: len });
// leading length and (potentially) trailing null
console.log('QNAME (len ' + (result.total - total) + '):', result.qname, result.cp ? '(pointer)' : '');
console.log('QTYPE (len 2):', dv.getUint16(result.total, false));
result.total += 2;
console.log('QCLASS (len 2):', dv.getUint16(result.total, false));
result.total += 2;
return result;
}
var q = { total: 12 }; var q = { total: 12 };
function mapChar(ch) { return JSON.stringify(String.fromCharCode(ch)) + '(' + ch + ')'; } function mapChar(ch) { return JSON.stringify(String.fromCharCode(ch)) + '(' + ch + ')'; }
function leftPad(ch) { ch = ch.toString(); while (ch.length < 2) { ch = '0' + ch; } return ch; }
console.log(''); console.log('');
@ -99,7 +145,7 @@ console.log('//////////////////');
console.log(''); console.log('');
for (count = 0; count < qdcount; count += 1) { for (count = 0; count < qdcount; count += 1) {
console.log(''); console.log('');
console.log('Question ' + (count + 1) + ' of ' + qdcount + ' (byte index: ' + q.total + ')'); console.log('Question ' + (count + 1) + ' of ' + qdcount + ' (byte index: 0x' + leftPad(q.total.toString(16)) + ' ' + q.total + ')');
q = unpackQuestion(dv, q.total, ab.byteLength); q = unpackQuestion(dv, q.total, ab.byteLength);
console.log(''); console.log('');
} }
@ -111,7 +157,7 @@ console.log('//////////////////');
console.log(''); console.log('');
for (count = 0; count < ancount; count += 1) { for (count = 0; count < ancount; count += 1) {
console.log(''); console.log('');
console.log('Answer', count + 1, 'of', ancount + ' (byte index: ' + q.total + ')'); console.log('Answer', count + 1, 'of', ancount + ' (byte index: 0x' + q.total.toString(16) + ' ' + q.total + ')');
q = unpackQuestion(dv, q.total, ab.byteLength); q = unpackQuestion(dv, q.total, ab.byteLength);
console.log(''); console.log('');
} }
@ -124,7 +170,7 @@ console.log('//////////////////');
console.log(''); console.log('');
for (count = 0; count < nscount; count += 1) { for (count = 0; count < nscount; count += 1) {
console.log(''); console.log('');
console.log('Authority', count + 1, 'of', nscount + ' (byte index: ' + q.total + ')'); console.log('Authority', count + 1, 'of', nscount + ' (byte index: 0x' + q.total.toString(16) + ' ' + q.total + ')');
q = unpackQuestion(dv, q.total, ab.byteLength); q = unpackQuestion(dv, q.total, ab.byteLength);
console.log('ttl (len 4):', dv.getUint32(q.total, false)); console.log('ttl (len 4):', dv.getUint32(q.total, false));
q.total += 4; q.total += 4;
@ -144,10 +190,14 @@ console.log('//////////////////');
console.log(''); console.log('');
for (count = 0; count < arcount; count += 1) { for (count = 0; count < arcount; count += 1) {
console.log(''); console.log('');
console.log('Additional', count + 1, 'of', arcount + ' (byte index: ' + q.total + ')'); console.log('Additional', count + 1, 'of', arcount + ' (byte index: 0x' + q.total.toString(16) + ' ' + q.total + ')');
q = unpackQuestion(dv, q.total, ab.byteLength); q = unpackQuestion(dv, q.total, ab.byteLength);
console.log(''); console.log('');
} }
console.log('');
console.log('total bytes', dv.byteLength);
console.log('total bytes read', q.total);
console.log('');
}()); }());

45
bin/debugd.js Normal file
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@ -0,0 +1,45 @@
#!/usr/bin/env
(function () {
'use strict';
var cli = { port: 65053, address: null, udp6: false, bin: process.argv[2] };
var dgram = require('dgram');
var server = dgram.createSocket({
type: cli.udp6 ? 'udp6' : 'udp4'
, reuseAddr: true
});
var handlers = {};
var bin = require('fs').readFileSync(cli.bin, null);
handlers.onMessage = function (nb, rinfo) {
console.log('[DEBUG] got a message');
// replace the id to match
bin[0] = nb[0];
bin[1] = nb[1];
server.send(bin, rinfo.port, rinfo.address, function () {
console.log('[DEBUG] sent response');
});
};
handlers.onListening = function () {
/*jshint validthis:true*/
var server = this;
if (cli.mdns || '224.0.0.251' === cli.nameserver) {
server.setBroadcast(true);
server.addMembership(cli.nameserver);
}
console.log('');
console.log('Bound and Listening:');
console.log(server.address().address + '#' + server.address().port + ' (' + server.type + ')');
};
server.bind({
port: cli.port
, address: cli.address
});
server.on('listening', handlers.onListening);
}());