SSH Tunnel Listener Activity Log

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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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bool success = false;

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

Chilkat.SshTunnel tunnel = new 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;

int sshPort = 22;
success = tunnel.Connect("ssh.example.com",sshPort);
if (success == false) {
    Debug.WriteLine(tunnel.LastErrorText);
    return;
}

//  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.
string password = "mySshPassword";

success = tunnel.AuthenticatePw("mySshLogin",password);
if (success == false) {
    Debug.WriteLine(tunnel.LastErrorText);
    return;
}

int listenPort = 1080;
success = tunnel.BeginAccepting(listenPort);
if (success == false) {
    Debug.WriteLine(tunnel.LastErrorText);
    return;
}

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

//  Read the accumulated in-memory listener log.
Debug.WriteLine(tunnel.AcceptLog);

bool waitForThreadExit = true;
success = tunnel.CloseTunnel(waitForThreadExit);
if (success == false) {
    Debug.WriteLine(tunnel.LastErrorText);
    return;
}