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Soms week ago a client came to me with the request to restructure the nameservers for his hosting company. Due to the requirements, I soon realised none of the existing DNS servers would be a perfect fit. Me, being a PHP programmer with some decent general linux/server skills decided to do what I do best: write a small nameservers which could execute the zone transfers... in PHP. I proposed the plan to the client and explained to him how this was going to solve all of his problems. He agreed and started worked.

After a few week of reading a dozen RFC documents on the DNS protocol I wrote a DNS library capable of reading/writing the master file format and reading/writing the binary wire format (we needed this anyway, we had some more projects where PHP did not provide is with enough control over the DNS queries). In short, I wrote a decent DNS resolver.

Another two weeks I was working on the actual DNS server which would handle the NOTIFY queries and execute the zone transfers (AXFR queries). I used the pthreads extension to make the server behave like an actual server which can handle multiple request at once. It took some time (in my opinion the pthreads extension is not extremely well documented and a lot of its behavior has to be detected through trail and error, or, reading the C source code. However, it still is a pretty decent extension.)

Yesterday, while debugging some last issues, the DNS server written in PHP received its first NOTIFY about a changed DNS zone. It executed the zone transfer and updated the real database of the actual primary DNS server. I was extremely euphoric and I began to realise what I wrote in the weeks before. I shared the good news the client and with some other people (a network engineer, a server administrator, a junior programmer, etc.). None of which really seemed to understand what I did. The most positive response was: "So, you can execute a zone transfer?", in a kind of condescending way.

This was one of those moments I realised again, most of the people, even those who are fairly technical, will never understand what we programmers do. My euphoric moment soon became a moment of loneliness...