tried commenting out some code from befferconsumer to trace down more of the problem

howto.md

@@ -15,7 +15,7 @@ How to duplicate DNS crash:
 Then in another terminal enter:
 
 ```
-dig @224.0.0.251 -p 5353 -t PTR _cloud._tcp.local
+>> dig @224.0.0.251 -p 5353 -t PTR _cloud._tcp.local
 ```
 
 The listener then crashes with an output of:
@@ -39,11 +39,38 @@ Error: Buffer overflow
     at Object.module.exports.respond (/home/daplie/dns_test/cloud-respond.js:10:11)
 
 ```
+After commenting out lines 45-53 in dns_test/node_modules/dns-js/lib/bufferconsumer.js
+and rerunning the previous commands, the result is a new error:
+
+```
+START DNS PACKET
+buffer.js:829
+    throw new RangeError('Index out of range');
+    ^
+
+RangeError: Index out of range
+    at checkOffset (buffer.js:829:11)
+    at Buffer.readUInt8 (buffer.js:867:5)
+    at BufferConsumer.byte (/home/daplie/dns_test/node_modules/dns-js/lib/bufferconsumer.js:67:22)
+    at BufferConsumer.name (/home/daplie/dns_test/node_modules/dns-js/lib/bufferconsumer.js:120:14)
+    at Function.DNSRecord.parse (/home/daplie/dns_test/node_modules/dns-js/lib/dnsrecord.js:187:14)
+    at /home/daplie/dns_test/node_modules/dns-js/lib/dnspacket.js:164:30
+    at Array.forEach (native)
+    at Function.DNSPacket.parse (/home/daplie/dns_test/node_modules/dns-js/lib/dnspacket.js:159:17)
+    at /home/daplie/dns_test/cloud-respond.js:86:31
+    at Array.forEach (native)
+
+```
+which is located in the node.js buffer module. The API is [here](https://nodejs.org/api/buffer.html).
 
 
+When can a Buffer overflow problem occur in js?
 
 
-How to print out hex values of the DNS message?
+What are the possible problems?
+
+
+How to print out hex values of the DNS message in node.js?
 
 ```javascript
 socket.on('message', function (message, rinfo) {

listen.js

@@ -15,7 +15,7 @@ socket.on('message', function (message, rinfo) {
   console.log('Received %d bytes from %s:%d\n',
     message.length, rinfo.address, rinfo.port);
   //console.log(msg.toString('utf8'));
-buf.forEach parseInt(byte.toString('hex'), 16).toString(2);
+message.forEach(parseInt(byte.toString('hex'), 16).toString(2));
   console.log(message.toString('hex'));
   var packets;
 

node_modules/dns-js/lib/bufferconsumer.js

@@ -42,15 +42,15 @@ BufferConsumer.prototype.slice = function (length) {
     return v;
   }
   else {
-    if ((this._offset + length) > this.length) {
+    // if ((this._offset + length) > this.length) {
-      debug('Buffer owerflow. Slice beyond buffer.', {
+    //   debug('Buffer owerflow. Slice beyond buffer.', {
-        offset: this._offset,
+    //     offset: this._offset,
-        length: length,
+    //     length: length,
-        bufferLength: this.length
+    //     bufferLength: this.length
-      });
+    //   });
-      debug('so far', this);
+    //   debug('so far', this);
-      throw new Error('Buffer overflow');
+    //   throw new Error('Buffer overflow');
-    }
+    // }
     v = this.buffer.slice(this._offset, this._offset + length);
     this._offset += length;
     return v;