PowerShell

SSH Tunnel Listener Activity Log

Demonstrates the listener-log properties KeepAcceptLog, AcceptLog, and AcceptLogPath, which record the activity of the background listener thread started by BeginAccepting.

Note: The log paths are relative to the application's current working directory. Absolute paths may also be used.

Background: Because the listener runs on a background thread, an activity log is often the only practical way to see what it is doing — which connections it accepted and when. KeepAcceptLog must be enabled for the in-memory AcceptLog to be populated; AcceptLogPath is an independent file-based log that persists across the run. This log covers the listener specifically, as distinct from the TunnelLog that records the SSH tunnel threads.

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Add-Type -Path "C:\chilkat\ChilkatDotNet47-x64\ChilkatDotNet47.dll"

$success = $false

#  Demonstrates the SshTunnel listener-log properties KeepAcceptLog, AcceptLog, and AcceptLogPath.
#  
#  These log the activity of the background listener thread started by BeginAccepting.

$tunnel = New-Object Chilkat.SshTunnel

#  Retain the listener activity log in memory so it can be read from the AcceptLog property.
$tunnel.KeepAcceptLog = $true

#  Optionally also write the listener activity to a file (separate from the in-memory log).
$tunnel.AcceptLogPath = "qa_output/accept.log"

$tunnel.DestHostname = "db.internal.example.com"
$tunnel.DestPort = 5432

$sshPort = 22
$success = $tunnel.Connect("ssh.example.com",$sshPort)
if ($success -eq $false) {
    $($tunnel.LastErrorText)
    exit
}

#  Normally you would not hard-code the password in source.  You should instead obtain it
#  from an interactive prompt, environment variable, or a secrets vault.
$password = "mySshPassword"

$success = $tunnel.AuthenticatePw("mySshLogin",$password)
if ($success -eq $false) {
    $($tunnel.LastErrorText)
    exit
}

$listenPort = 1080
$success = $tunnel.BeginAccepting($listenPort)
if ($success -eq $false) {
    $($tunnel.LastErrorText)
    exit
}

#  ... the listener accepts connections for a while ...

#  Read the accumulated in-memory listener log.
$($tunnel.AcceptLog)

$waitForThreadExit = $true
$success = $tunnel.CloseTunnel($waitForThreadExit)
if ($success -eq $false) {
    $($tunnel.LastErrorText)
    exit
}