Delphi DLL

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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Delphi DLL

var
success: Boolean;
tunnel: HCkSshTunnel;
sshPort: Integer;
password: PWideChar;
listenPort: Integer;
waitForThreadExit: Boolean;

begin
success := False;

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

tunnel := CkSshTunnel_Create();

//  Retain the SSH tunnel-thread activity in memory so it can be read from the TunnelLog property.
CkSshTunnel_putKeepTunnelLog(tunnel,True);

//  Optionally also write the tunnel-thread activity to a file (separate from the in-memory log).
CkSshTunnel_putTunnelLogPath(tunnel,'qa_output/tunnel.log');

CkSshTunnel_putDestHostname(tunnel,'db.internal.example.com');
CkSshTunnel_putDestPort(tunnel,5432);

sshPort := 22;
success := CkSshTunnel_Connect(tunnel,'ssh.example.com',sshPort);
if (success = False) then
  begin
    Memo1.Lines.Add(CkSshTunnel__lastErrorText(tunnel));
    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 := CkSshTunnel_AuthenticatePw(tunnel,'mySshLogin',password);
if (success = False) then
  begin
    Memo1.Lines.Add(CkSshTunnel__lastErrorText(tunnel));
    Exit;
  end;

listenPort := 1080;
success := CkSshTunnel_BeginAccepting(tunnel,listenPort);
if (success = False) then
  begin
    Memo1.Lines.Add(CkSshTunnel__lastErrorText(tunnel));
    Exit;
  end;

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

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

waitForThreadExit := True;
success := CkSshTunnel_CloseTunnel(tunnel,waitForThreadExit);
if (success = False) then
  begin
    Memo1.Lines.Add(CkSshTunnel__lastErrorText(tunnel));
    Exit;
  end;

CkSshTunnel_Dispose(tunnel);