timeblock plugin for coreDns

A plugin to selectively block dns lookup for ip and time combination. Inspired from acl plugin

Description

use this to selectively block IP between a time range

Syntax

Example below blocks roblox.com every day from 8am to 5pm for a given IP. Outside the range normal forward is applied.

roblox.com:53 {
  timeblock 0:7-08:00-17:00 192.168.86.74
  forward . 8.8.8.8:53 
}

• date range the time range as day of week, startTime, endTime. The time is local time, there is not timeZone translation so make sure your server/configuration coincide

  • day First part is day of the week, eg here 0 to 7 - 0 being Sunday

  • startTime Second part is start time range as defined HH:MM, here 08:00

  • endTime third part is end time range as defined HH:MM, here 17:00

• IP Typical CIDR notation and single IP address are supported - In the example above single IP:192.168.86.74

install

checkout coreDns at https://github.com/coredns/coredns

edit plugin.cfg and add

...
timeblock:github.com/pmonestie/corednsTimeBlock/timeblock

...

Make sure to add that plugin near the top, next to acl plugin is a good place: remember that plugins are executed in order, so it definately needs to be before forward plugin run

go generate
go run coredns.go

example

block roblox from 9am to 5pm This is combined with cache...

roblox.com:53 {
    cache 100
    timeblock 0:7-09:00-17:00 192.168.86.75
    forward . 8.8.8.8:53
}
.:53 {
    forward . 8.8.8.8:53
}