PHP

SSH Tunnel Per-Client Logging and Client Identifier

Demonstrates the ClientLogDir and ClientIdentifier properties. When ClientLogDir is set, a separate log file is created for each tunnel client; ClientIdentifier is the SSH client-identification string sent during the handshake.

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

Background: When many clients share one tunnel, a single combined log is hard to follow, so ClientLogDir gives each connection its own file — the fastest way to diagnose one misbehaving client. ClientIdentifier sets the version string the server sees; overriding the default is occasionally needed for compatibility with servers that key behavior off the client identification, or simply to label your application in server logs.

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<?php

use Chilkat2\SshTunnel;

// Demonstrates the SshTunnel per-client logging properties ClientLogDir and ClientIdentifier.

$tunnel = new SshTunnel();

// When ClientLogDir is set, a separate log file is created for each tunnel client in this
// directory, which is useful for troubleshooting individual connections.
$tunnel->ClientLogDir = 'qa_output/client_logs';

// The SSH client-identification string sent to the SSH server during the handshake.
$tunnel->ClientIdentifier = 'SSH-2.0-MyTunnelApp_1.0';

$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;
}

echo 'Tunnel running; each client is logged in ', $tunnel->ClientLogDir, "\n";

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