Delphi 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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var
success: Integer;
tunnel: TChilkatSshTunnel;
sshPort: Integer;
password: WideString;
listenPort: Integer;
waitForThreadExit: Integer;

begin
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 := TChilkatSshTunnel.Create(Self);

//  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) then
  begin
    Memo1.Lines.Add(tunnel.LastErrorText);
    Exit;
  end;

//  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) then
  begin
    Memo1.Lines.Add(tunnel.LastErrorText);
    Exit;
  end;

listenPort := 1080;
success := tunnel.BeginAccepting(listenPort);
if (success = 0) then
  begin
    Memo1.Lines.Add(tunnel.LastErrorText);
    Exit;
  end;

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

//  Read the accumulated in-memory listener log.
Memo1.Lines.Add(tunnel.AcceptLog);

waitForThreadExit := 1;
success := tunnel.CloseTunnel(waitForThreadExit);
if (success = 0) then
  begin
    Memo1.Lines.Add(tunnel.LastErrorText);
    Exit;
  end;