# Racket DNS resolver and server

This is a [Racket](http://racket-lang.org/) implementation of a DNS
server and iterative resolver. It's written to work with
[Marketplace](https://github.com/tonyg/marketplace), but could readily
be adapted to work with other I/O substrates. (It originally used
Racket's `sync` and events directly.)

The code is not quite fully separated into a reusable library (or even
a configurable service) yet. Changing this is straightforward, but
low-priority right now. Patches welcome!

## How to compile and run the code

You will need the latest **prerelease** version of Racket. Any version
newer than or equal to Racket 5.3.4.10 should work. Nightly-build
installers for Racket can be downloaded
[here](http://pre.racket-lang.org/installers/).

Once you have Racket installed,

    raco pkg install marketplace

to install Marketplace (note: will take a long time), and then

    raco make driver.rkt proxy.rkt

to compile the DNS code. Once it has compiled successfully,

    DNSPORT=5444 racket driver.rkt

will start a DNS leaf zone server on port 5444 holding records from
`test-rrs.rkt`'s `test-rrs` variable, and

    DNSPORT=5444 racket proxy.rkt

will start an iterative DNS resolver service on port 5444 offering
regular DNS service to all comers.

You can try out the service with

    dig @localhost -p 5444 localhost.example

To enable debug output, try

    MATRIX_LOG=info DNSPORT=5444 racket driver.rkt

## Copyright and License

Copyright 2010, 2011, 2012, 2013 Tony Garnock-Jones <tonyg@ccs.neu.edu>

This file is part of marketplace-dns.

marketplace-dns is free software: you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.

marketplace-dns is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.

You should have received a copy of the GNU General Public License
along with marketplace-dns. If not, see
<http://www.gnu.org/licenses/>.