param(
    [string]$ListenAddress = "100.103.206.4",
    [int]$ListenPort = 8011,
    [string]$ConnectAddress = "127.0.0.1",
    [int]$ConnectPort = 8011
)

$ErrorActionPreference = "Stop"

$listener = [System.Net.Sockets.TcpListener]::new(
    [System.Net.IPAddress]::Parse($ListenAddress),
    $ListenPort
)
$listener.Start()
Write-Output "Forwarding tcp://$ListenAddress`:$ListenPort -> tcp://$ConnectAddress`:$ConnectPort"

try {
    while ($true) {
        $client = $listener.AcceptTcpClient()
        $null = [System.Threading.ThreadPool]::QueueUserWorkItem({
            param($state)

            $source = $state.Source
            $target = [System.Net.Sockets.TcpClient]::new()
            try {
                $target.Connect($state.ConnectAddress, $state.ConnectPort)
                $sourceStream = $source.GetStream()
                $targetStream = $target.GetStream()

                $copyToTarget = $sourceStream.CopyToAsync($targetStream)
                $copyToSource = $targetStream.CopyToAsync($sourceStream)
                [System.Threading.Tasks.Task]::WaitAny($copyToTarget, $copyToSource) | Out-Null
            } catch {
                # Drop failed bridge attempts; the caller will see the connection fail.
            } finally {
                $source.Close()
                $target.Close()
            }
        }, @{
            Source = $client
            ConnectAddress = $ConnectAddress
            ConnectPort = $ConnectPort
        })
    }
} finally {
    $listener.Stop()
}