Delphi DLL

Multi-Hop SSH (SSH Through SSH)

See more SSH Examples

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

Delphi DLL

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

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Boolean;
ssh1: HCkSsh;
hostname: PWideChar;
port: PWideChar;
ssh2: HCkSsh;
channelNum: Integer;

begin
success := False;

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

ssh1 := CkSsh_Create();

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

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

// Wait a max of 15 seconds when reading responses..
CkSsh_putIdleTimeoutMs(ssh1,15000);

// Authenticate using login/password:
success := CkSsh_AuthenticatePw(ssh1,'myLogin','myPassword');
if (success <> True) then
  begin
    Memo1.Lines.Add(CkSsh__lastErrorText(ssh1));
    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 := CkSsh_Create();
success := CkSsh_ConnectThroughSsh(ssh2,ssh1,'someremoteserver.com',22);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkSsh__lastErrorText(ssh2));
    Exit;
  end;

CkSsh_putIdleTimeoutMs(ssh2,15000);

// Authenticate with ssh2...
success := CkSsh_AuthenticatePw(ssh2,'myLogin2','myPassword2');
if (success <> True) then
  begin
    Memo1.Lines.Add(CkSsh__lastErrorText(ssh2));
    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 := CkSsh_OpenSessionChannel(ssh2);
if (channelNum < 0) then
  begin
    Memo1.Lines.Add(CkSsh__lastErrorText(ssh2));
    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.
CkSsh_Disconnect(ssh2);

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

CkSsh_Disconnect(ssh1);

CkSsh_Dispose(ssh1);
CkSsh_Dispose(ssh2);

end;