PHP

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

use Chilkat2\SshTunnel;

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

$tunnel = new 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;
try {
    $tunnel->Connect('ssh.example.com', $sshPort);

    // 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';

    $tunnel->AuthenticatePw('mySshLogin', $password);

    $listenPort = 1080;
    $tunnel->BeginAccepting($listenPort);
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

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

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

$waitForThreadExit = true;
try {
    $tunnel->CloseTunnel($waitForThreadExit);
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}