(Delphi ActiveX) Multi-Hop SSH (SSH Through SSH)

Demonstrates how to SSH through one SSH server to get to another SSH server. The scheme looks like this:

Application => ServerSSH1 => ServerSSH2

The ConnectThroughSsh method is added in Chilkat version 9.5.0.55 to accomplish this task. Technically, it should be possible to chain any number of servers using the ConnectThroughSsh multiple times:

Application => ServerSSH1 => ServerSSH2 ==> ServerSSH3 => ... => ServerSSHN

Chilkat for Delphi Downloads Chilkat ActiveX DLL for Delphi Chilkat non-ActiveX DLL for Delphi * The examples here use the ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Chilkat_TLB;

...

procedure TForm1.Button1Click(Sender: TObject);
var
ssh1: TChilkatSsh;
hostname: WideString;
port: WideString;
success: Integer;
ssh2: TChilkatSsh;
channelNum: Integer;

begin
// This example assumes the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

ssh1 := TChilkatSsh.Create(Self);

// Hostname may be an IP address or domain name:
hostname := '192.168.1.108';
port := 22;

// Connect directly to the 1st SSH server:
success := ssh1.Connect(hostname,port);
if (success <> 1) then
  begin
    Memo1.Lines.Add(ssh1.LastErrorText);
    Exit;
  end;

// Wait a max of 15 seconds when reading responses..
ssh1.IdleTimeoutMs := 15000;

// Authenticate using login/password:
success := ssh1.AuthenticatePw('myLogin','myPassword');
if (success <> 1) then
  begin
    Memo1.Lines.Add(ssh1.LastErrorText);
    Exit;
  end;

// Connect through the 1st SSH connection to reach a 2nd SSH server.
// Note: Any number of SSH connections may be simultaneously tunneled through a single
// existing SSH connection.
ssh2 := TChilkatSsh.Create(Self);
success := ssh2.ConnectThroughSsh(ssh1.ControlInterface,'someremoteserver.com',22);
if (success <> 1) then
  begin
    Memo1.Lines.Add(ssh2.LastErrorText);
    Exit;
  end;

ssh2.IdleTimeoutMs := 15000;

// Authenticate with ssh2...
success := ssh2.AuthenticatePw('myLogin2','myPassword2');
if (success <> 1) then
  begin
    Memo1.Lines.Add(ssh2.LastErrorText);
    Exit;
  end;

// The application may now is connected and authenticated with ssh2.
// The application can do whatever it desires just as if it was directly
// connected to ssh2.   For example, the application might open
// a session channel to send commands or start a remote shell..
channelNum := ssh2.OpenSessionChannel();
if (channelNum < 0) then
  begin
    Memo1.Lines.Add(ssh2.LastErrorText);
    Exit;
  end;

// ...
// ...
// ...

// Close the connection with ssh2.  (This closes the the tunnel through ssh1.)
// The connection with ssh1 is still alive, and may be used for more connections.
ssh2.Disconnect();

// ...
// ...
// ...

ssh1.Disconnect();
end;