1.1 KiB
KnockKnock
A Windows Service for providing services on-demand.
Overview
KnockKnock acts as a TCP proxy, accepting connections and then forwarding all traffic between a client and upstream. It allows you to register commands to run when the service is idle (no open connections) and active (incoming connection(s)).
For example, when forwarding connections to a Hyper-V VM, you could suspend the VM when there are no active connections, and resume it whenever a user attempts to connect.
(Personally, this is how I use it--allowing my development VM to be suspended automatically when I am not connected to it through RDP.)
TODO / Limitations
This is basically the minimum viable app that solves my own problem. I slapped it together in less than an hour.
Configuration is hardcoded: it only forwards :1234 -> 10.200.0.10:3306; it
always runs SuspendVM
and ResumeVM
against the Debian
Hyper-V machine.
The socket code is kind of janky and some activity patterns will make it
explode.
It works for me to proxy a Microsoft Remote Desktop Connection session through to a Hyper-V VM available on-demand.
License
None. Do not redistribute.