A simple authoritative DNS workbench server written in Go that allows for quick loading and reloading of zone definitions. Because it can be setup and reconfigured extremely easily it's somewhat useful for testing and other random things, you don't need a degree from ISC!
Zone definition files use YAML and can be loaded at runtime or via the HTTP API.
The zone defintion format follows a somewhat similar path to the standard definition
files used by other DNS servers like BIND. Record values must be in the 'presentation'
format in order to be properly parsed. Generally just googling the RR type name
will give you enough information to construct pretty much whatever record you'd
like (restricted to the types that github.com/miekg/dns
supports of course).
zones:
bracewel.net:
bracewel.net:
a:
- 1.1.1.1
- 2.2.2.2
aaaa:
- FF01:0:0:0:0:0:0:FB
caa:
- 0 issue "letsencrypt.org"
ns:
- 1.1.1.2
- 1.1.1.3
- 1.1.1.4
- 1.1.1.5
www.bracewel.net:
a:
- 1.1.1.1
- 2.2.2.2
aaaa:
- FF01:0:0:0:0:0:0:FB
ns:
- 1.1.1.2
- 1.1.1.3
- 1.1.1.4
- 1.1.1.5
SOA and NS authority records are automatically generated for each zone. All
SOA parameters and TTLs on RRs are automatically set.
The above zone definition file would be equivalent to something along the lines of the following BIND zone definition.
bracewel.net. 3600 IN SOA localhost. dns.localhost. 1508222340 10000 2400 604800 3600
bracewel.net. 3600 IN A 1.1.1.1
bracewel.net. 3600 IN A 2.2.2.2
bracewel.net. 3600 IN AAAA ff01::fb
bracewel.net. 3600 IN NS 1.1.1.2.
bracewel.net. 3600 IN NS 1.1.1.3.
bracewel.net. 3600 IN NS 1.1.1.4.
bracewel.net. 3600 IN NS 1.1.1.5.
bracewel.net. 3600 IN CAA 0 issue "letsencrypt.org"
www 3600 IN A 1.1.1.1
www 3600 IN A 2.2.2.2
www 3600 IN AAAA ff01::fb
www 3600 IN NS 1.1.1.2.
www 3600 IN NS 1.1.1.3.
www 3600 IN NS 1.1.1.4.
www 3600 IN NS 1.1.1.5.
The DNS server can reload all of the zones it is currently serving gracefully
via a HTTP API. To change zones you need to POST a JSON version of a zone file
to /api/reload. If the zone file cannot be parsed then an error string will be
returned and the server will keep serving the previous zones.
This can be done manually or by using the dns-workbench binary like so
$ dns-workbench reload --zone-file new-zones.yml
Loading a new zone file will replace any previous definitions.
Building is super simple, thanks Go!
$ go build dns-workbench.go
$ dns-workbench
NAME:
dns-workbench - a simple authoritative DNS workbench server
USAGE:
dns-workbench [global options] command [command options] [arguments...]
VERSION:
0.0.1
AUTHOR(S):
Roland Shoemaker <rolandshoemaker@gmail.com>
COMMANDS:
run Starts the DNS server
reload Loads a new zone file into a running workbench
help, h Shows a list of commands or help for one command
GLOBAL OPTIONS:
--help, -h show help
--version, -v print the version