PHP ActiveX

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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<?php

$success = 0;

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

$tunnel = new COM("Chilkat.SshTunnel");

//  Retain the listener activity log in memory so it can be read from the AcceptLog property.
$tunnel->KeepAcceptLog = 1;

//  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 == 0) {
    print $tunnel->LastErrorText . "\n";
    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 == 0) {
    print $tunnel->LastErrorText . "\n";
    exit;
}

$listenPort = 1080;
$success = $tunnel->BeginAccepting($listenPort);
if ($success == 0) {
    print $tunnel->LastErrorText . "\n";
    exit;
}

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

//  Read the accumulated in-memory listener log.
print $tunnel->AcceptLog . "\n";

$waitForThreadExit = 1;
$success = $tunnel->CloseTunnel($waitForThreadExit);
if ($success == 0) {
    print $tunnel->LastErrorText . "\n";
    exit;
}


?>