WSL2_PORT_FORWARDING.ps1

# WSL2_PORT_FORWARDING.ps1
# This script created by Brian Ketelsen (https://www.brianketelsen.com/blog/ssh-to-wsl2/
# and trivially patched by Thomas Willey 12/2020
# PURPOSE: Enable local development in WSL2 and expose webservers/services over IP from w/in WSL2 to local network of windows machine
# Use example scenario:
#   1. open WSL2, start server (e.g., python3 http.server 0.0.0.0:8000), and try to visit from win machine (e.g., http://localhost:8000) - notice it fails to resolve.
#   2. open powershell as administrator and run this script
#   3. refresh the page on your win machine's browser (http://localhost:8000) and see that it loads up.
#   4. bonus: mDNS should work. So you can access from e.g., your phone on local wifi to http://<windows hostname>.local:8000


$remoteport = bash.exe -c "ip address show eth0 | grep 'inet '"
$found = $remoteport -match '\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}';

if( $found  ){
  $remoteport = $matches[0];
  
} else{
  echo "The Script Exited, the ip address of WSL 2 cannot be found";
    exit;
    
}

#[Ports]

#All the ports you want to forward separated by comma
$ports=@(5000,8000);


#[Static ip]
#You can change the addr to your ip config to listen to a specific address
$addr='0.0.0.0';
$ports_a = $ports -join ",";


#Remove Firewall Exception Rules
iex "Remove-NetFireWallRule -DisplayName 'WSL 2 Firewall Unlock' ";

#adding Exception Rules for inbound and outbound Rules
iex "New-NetFireWallRule -DisplayName 'WSL 2 Firewall Unlock' -Direction Outbound -LocalPort $ports_a -Action Allow -Protocol TCP";
iex "New-NetFireWallRule -DisplayName 'WSL 2 Firewall Unlock' -Direction Inbound -LocalPort $ports_a -Action Allow -Protocol TCP";

for( $i = 0; $i -lt $ports.length; $i++  ){
  $port = $ports[$i];
    iex "netsh interface portproxy delete v4tov4 listenport=$port listenaddress=$addr";
    iex "netsh interface portproxy add v4tov4 listenport=$port listenaddress=$addr connectport=$port connectaddress=$remoteport";  
}