PHP ActiveX

SSH Tunnel Thread Activity Log

Demonstrates the tunnel-log properties KeepTunnelLog, TunnelLog, and TunnelLogPath, which record the activity of the SSH tunnel and client-manager threads.

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

Background: This is the counterpart to the accept log, covering the SSH side rather than the listener: the tunnel and client-manager threads that actually move data. As with the accept log, KeepTunnelLog enables the in-memory TunnelLog while TunnelLogPath writes a separate file. Together the two logs let you localize a problem to either the accepting side or the forwarding side.

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<?php

$success = 0;

//  Demonstrates the SshTunnel tunnel-log properties KeepTunnelLog, TunnelLog, and TunnelLogPath.
//  
//  These log the activity of the SSH tunnel and client-manager threads.

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

//  Retain the SSH tunnel-thread activity in memory so it can be read from the TunnelLog property.
$tunnel->KeepTunnelLog = 1;

//  Optionally also write the tunnel-thread activity to a file (separate from the in-memory log).
$tunnel->TunnelLogPath = 'qa_output/tunnel.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;
}

//  ... clients transfer data through the tunnel ...

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

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


?>