[ANN] Simple DNS Server implemented in Go

Daniel Lorch

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Jun 25, 2019, 4:23:06 PM6/25/19

to golang-nuts

Hi all

I have implemented a simple authoritative DNS Server in Go. You can find it here: https://github.com/dlorch/dnsserver/

It's a study project to teach myself Go and DNS.

Usage as follows:

$ go run dnsserver.go &
Listening at:  :1053

$ dig example.com @localhost -p 1053
Received request from  [::1]:63282

; <<>> DiG 9.10.6 <<>> example.com @localhost -p 1053
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 17060
;; flags: qr; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;example.com.			IN	A

;; ANSWER SECTION:
example.com.		31337	IN	A	3.1.3.7

;; Query time: 0 msec
;; SERVER: ::1#1053(::1)
;; WHEN: Mon Jun 17 17:02:43 CEST 2019
;; MSG SIZE  rcvd: 56

Looking forward to any feedback you might have.

Regards

Daniel

Eric S. Raymond

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Jun 25, 2019, 4:36:10 PM6/25/19

to Daniel Lorch, golang-nuts

Daniel Lorch <dlo...@gmail.com>:

> I have implemented a simple authoritative DNS Server in Go. You can find it
> here: https://github.com/dlorch/dnsserver/
>
> It's a study project to teach myself Go and DNS.

Haven't looked at it yet, but I must say I think you just nailed one
of the ideal use cases for Go. Provable buffer overrun protection is
especially desirable in this kind of service, and the language
libraries undoubtedly make for a small, clean, exceptionally auditable
implementation. Good on you.
--
<a href="http://www.catb.org/~esr/">Eric S. Raymond</a>

Matt Harden

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Jun 25, 2019, 8:54:39 PM6/25/19

to e...@thyrsus.com, Daniel Lorch, golang-nuts

I realize this is a learning exercise for you, but in case you're interested, the DNS message types are implemented for you in https://godoc.org/golang.org/x/net/dns/dnsmessage.

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Olu Peter

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Jun 26, 2019, 2:39:20 AM6/26/19

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Cool stuff. I’ll check it out and revert

Daniel Lorch

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Jun 26, 2019, 1:27:41 PM6/26/19

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Hi Matt

I was not aware of this, thank you! I added a note in my repository.

Daniel

On Wednesday, June 26, 2019 at 2:54:39 AM UTC+2, Matt Harden wrote:

I realize this is a learning exercise for you, but in case you're interested, the DNS message types are implemented for you in https://godoc.org/golang.org/x/net/dns/dnsmessage.

On Tue, Jun 25, 2019 at 1:36 PM Eric S. Raymond <e...@thyrsus.com> wrote:

Daniel Lorch <dlo...@gmail.com>:
> I have implemented a simple authoritative DNS Server in Go. You can find it
> here: https://github.com/dlorch/dnsserver/
>
> It's a study project to teach myself Go and DNS.

Haven't looked at it yet, but I must say I think you just nailed one
of the ideal use cases for Go. Provable buffer overrun protection is
especially desirable in this kind of service, and the language
libraries undoubtedly make for a small, clean, exceptionally auditable
implementation. Good on you.
--
<a href="http://www.catb.org/~esr/">Eric S. Raymond</a>

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