2017-01-14 00:58:52 +00:00
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header
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=====
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```bash
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npm init
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2017-01-14 03:05:53 +00:00
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```
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2017-01-14 00:58:52 +00:00
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2017-01-14 02:04:27 +00:00
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how to duplicate DNS crash:
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2017-01-14 03:04:21 +00:00
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```
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cd ~/dns_test
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```
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2017-01-14 02:04:27 +00:00
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2017-01-14 03:04:21 +00:00
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```
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node listen.js
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```
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2017-01-14 00:58:52 +00:00
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2017-01-14 03:04:21 +00:00
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```
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dig @224.0.0.251 -p 5353 -t PTR _cloud._tcp.local
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```
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The output is then:
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```
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START DNS PACKET
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/home/daplie/dns_test/node_modules/dns-js/lib/bufferconsumer.js:52
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throw new Error('Buffer overflow')
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^
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Error: Buffer overflow
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at BufferConsumer.slice (/home/daplie/dns_test/node_modules/dns-js/lib/bufferconsumer.js:52:13)
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s at Function.DNSRecord.parse (/home/daplie/dns_test/node_modules/dns-js/lib/dnsrecord.js:237:46)
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at /home/daplie/dns_test/node_modules/dns-js/lib/dnspacket.js:164:30
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at Array.forEach (native)
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at Function.DNSPacket.parse (/home/daplie/dns_test/node_modules/dns-js/lib/dnspacket.js:159:17)
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at /home/daplie/dns_test/cloud-respond.js:86:31
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at Array.forEach (native)
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at /home/daplie/dns_test/cloud-respond.js:11:21
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at Array.forEach (native)
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at Object.module.exports.respond (/home/daplie/dns_test/cloud-respond.js:10:11)
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```
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How to print out hex values of the DNS message?
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```javascript
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socket.on('message', function (message, rinfo) {
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console.log('Received %d bytes from %s:%d\n',
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message.length, rinfo.address, rinfo.port);
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//console.log(msg.toString('utf8'));
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console.log(message.toString('hex'));
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```
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