Delphi ActiveX

Request SSH X11 Forwarding

Demonstrates the Chilkat Ssh.SendReqX11Forwarding method, which sends an X11-forwarding request on a session channel. The arguments are the channel number, whether forwarding is limited to a single connection, and the X11 authentication protocol, cookie, and screen number.

Background: X11 forwarding lets a graphical program running on the remote host display its window on your local machine, tunneled over SSH. This is a low-level method that only sends the protocol request — your application is still responsible for the local X server side of the arrangement. The authentication cookie guards the forwarded display, so it should be a freshly generated value rather than a fixed constant.

Chilkat Delphi ActiveX Downloads

Download Chilkat for Delphi ActiveX

Delphi ActiveX

var
success: Integer;
ssh: TChilkatSsh;
sshPort: Integer;
password: WideString;
channelNum: Integer;
singleConnection: Integer;
authProt: WideString;
authCookie: WideString;
screenNum: Integer;

begin
success := 0;

//  Demonstrates the Ssh.SendReqX11Forwarding method, which sends an SSH X11-forwarding request
//  on a session channel.  The 1st argument is the channel number, the 2nd limits forwarding to a
//  single connection, and the 3rd through 5th supply the X11 authentication protocol, cookie,
//  and screen number.

ssh := TChilkatSsh.Create(Self);

sshPort := 22;
success := ssh.Connect('ssh.example.com',sshPort);
if (success = 0) then
  begin
    Memo1.Lines.Add(ssh.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 := ssh.AuthenticatePw('mySshLogin',password);
if (success = 0) then
  begin
    Memo1.Lines.Add(ssh.LastErrorText);
    Exit;
  end;

//  Open a session channel.  A negative return value indicates failure.
channelNum := ssh.OpenSessionChannel();
if (channelNum < 0) then
  begin
    Memo1.Lines.Add(ssh.LastErrorText);
    Exit;
  end;

//  Request X11 forwarding.  Named variables make each argument's meaning clear.
singleConnection := 0;
authProt := 'MIT-MAGIC-COOKIE-1';
authCookie := 'd92f5e1a7c8b4306af17c2e5b9d43081';
screenNum := 0;
success := ssh.SendReqX11Forwarding(channelNum,singleConnection,authProt,authCookie,screenNum);
if (success = 0) then
  begin
    Memo1.Lines.Add(ssh.LastErrorText);
    Exit;
  end;
Memo1.Lines.Add('X11 forwarding requested.');

ssh.Disconnect();