WSL 2 TCP NETWORK FORWARDING, IMPROVED FOR TASK SCHEDULER! ALSO WORKS ON WINDOWS SERVER 2022!

wsl2-network.ps1

# WSL2 network port forwarding script v1
#   for enable script, 'Set-ExecutionPolicy -ExecutionPolicy Bypass -Scope CurrentUser' in Powershell,
#   for delete exist rules and ports use 'delete' as parameter, for show ports use 'list' as parameter.
#   written by Daehyuk Ahn, Aug-1-2020
#   edited by Ukjin Yang, Jun-7-2022 (Windows Server 2022 also works!)
#   Improved features: more detailed logs for Task Scheduler, saved IP check, etc.

If ($Args[0] -eq "list") {
    netsh interface portproxy show v4tov4;
    exit;
}

# If elevation needed, start new process
If (-NOT ([Security.Principal.WindowsPrincipal] [Security.Principal.WindowsIdentity]::GetCurrent()).IsInRole([Security.Principal.WindowsBuiltInRole]::Administrator))
{
  # Relaunch as an elevated process:
  Start-Process powershell.exe "-File",('"{0}"' -f $MyInvocation.MyCommand.Path),"$Args runas" -Verb RunAs
  exit
}

# You should modify '$Ports' for your applications 
$Ports = (22,80,443,8080)

# log file and saving IP file
$today = [System.DateTime]::Today.ToString("yyyyMMdd")
$logdir = "$PSScriptRoot\logs"
$logfile = "$logdir\wsl2ip_$today.log"
$lastfile = "$logdir\wsl2ip.txt"

# mkdir log folder if not exists
if (-not (Test-Path $logdir -PathType Container)) {
  New-Item -Path "$logdir" -ItemType "directory" | Out-Null
}

# Log helper function
function Log-Append {
  [CmdletBinding()]
  param(
    [Parameter()]
    [string] $Text
  )
  $now = [System.DateTime]::Now.ToString("yyyy-MM-dd HH:mm:ss.fff")
  Tee-Object -FilePath "$logfile" -Append -InputObject "WSL2IP: [$now] $Text" 
}

# Get WSL Interface IP, and get only first IP. (I don't know why multiple IPs registered)
wsl hostname -I | Set-Variable -Name "WslIp"
$WslIp = $WslIp.split(" ")[0]

$found = $WslIp -match '\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}';
if (-not $found) {
  Log-Append "WSL2 cannot be found. Terminate script."
  exit;
}

# Get saved IP for prevent unexpected running.
$OldIp = ""
if (Test-Path $lastfile -PathType Leaf) {
  $OldIp = Get-Content "$lastfile"
}
$OldIp = $OldIp.Trim()

if ($WslIp -eq $OldIp) {
  Log-Append "WSL2 IP ($WslIp) already bound in port proxy. Terminate script."
  exit;
}

# If you got new WSL IP, Go ahead!
Log-Append "Applying WSL IP to port proxy."

# Remove and Create NetFireWallRule
Log-Append "Replacing Firewall rules..."
Remove-NetFireWallRule -DisplayName 'WSL 2 Firewall Unlock' | Tee-Object -FilePath "$logfile" -Append;
if ($Args[0] -ne "delete") {
  New-NetFireWallRule -DisplayName 'WSL 2 Firewall Unlock' -Direction Outbound -LocalPort $Ports -Action Allow -Protocol TCP | Tee-Object -FilePath "$logfile" -Append;
  New-NetFireWallRule -DisplayName 'WSL 2 Firewall Unlock' -Direction Inbound -LocalPort $Ports -Action Allow -Protocol TCP | Tee-Object -FilePath "$logfile" -Append;
  New-NetFireWallRule -DisplayName 'WSL 2 Firewall Unlock' -Direction Outbound -LocalPort $Ports -Action Allow -Protocol UDP | Tee-Object -FilePath "$logfile" -Append;
  New-NetFireWallRule -DisplayName 'WSL 2 Firewall Unlock' -Direction Inbound -LocalPort $Ports -Action Allow -Protocol UDP | Tee-Object -FilePath "$logfile" -Append;
}

# Add each port into portproxy
Log-Append "Replacing port forwarding any to WSL2 Port..."
$Addr = "0.0.0.0"
Foreach ($Port in $Ports) {
    iex "netsh interface portproxy delete v4tov4 listenaddress=$Addr listenport=$Port | Out-Null";
    if ($Args[0] -ne "delete") {
        iex "netsh interface portproxy add v4tov4 listenaddress=$Addr listenport=$Port connectaddress=$WslIp connectport=$Port | Out-Null";
    }
}

# Display all portproxy information
Log-Append "Retrieving port forwarding table..."
netsh interface portproxy show v4tov4 | Tee-Object -FilePath "$logfile" -Append;

# Give user to chance to see above list when relaunched start
If ($Args[0] -eq "runas" -Or $Args[1] -eq "runas") {
  Write-Host -NoNewLine 'Press any key to close! ';
  $null = $Host.UI.RawUI.ReadKey('NoEcho,IncludeKeyDown');
}

# Save successful WSL IP to file.
Log-Append "Saving successful IP $WslIp to $lastfile ..."
$WslIp | Out-File -FilePath "$lastfile"

# Preserve WSL service scripts here.
Log-Append "Executing WSL Startup scripts..."
iex "wsl sudo service ssh start" | Tee-Object -FilePath "$logfile" -Append
iex "wsl sudo service cron start" | Tee-Object -FilePath "$logfile" -Append

Log-Append "Done."
Add-Content "$logfile" ""