Delphi ActiveX

SSH Tunnel with Dynamic Port Forwarding

See more SSH Examples

Demonstrates how to start a background thread that runs a portable SSH tunnel w/ dynamic port forwarding that the foreground thread can use for establishing connections through an SSH tunnel. Delphi ActiveX

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
success: Integer;
tunnel: TChilkatSshTunnel;
sshHostname: WideString;
sshPort: Integer;
url: WideString;
http: TChilkatHttp;
html: WideString;
waitForThreadExit: Integer;

begin
success := 0;

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

success := 0;

tunnel := TChilkatSshTunnel.Create(Self);

sshHostname := 'sftp.example.com';
sshPort := 22;

// Connect to an SSH server and establish the SSH tunnel:
success := tunnel.Connect(sshHostname,sshPort);
if (success <> 1) then
  begin
    Memo1.Lines.Add(tunnel.LastErrorText);
    Exit;
  end;

// Authenticate with the SSH server via a login/password
// or with a public key.  
// This example demonstrates SSH password authentication.
success := tunnel.AuthenticatePw('mySshLogin','mySshPassword');
if (success <> 1) then
  begin
    Memo1.Lines.Add(tunnel.LastErrorText);
    Exit;
  end;

// Indicate that the background SSH tunnel thread will behave as a SOCKS proxy server
// with dynamic port forwarding:
tunnel.DynamicPortForwarding := 1;

// We may optionally require that connecting clients authenticate with our SOCKS proxy server.
// To do this, set an inbound username/password.  Any connecting clients would be required to 
// use SOCKS5 with the correct username/password.
// If no inbound username/password is set, then our SOCKS proxy server will accept both
// SOCKS4 and SOCKS5 unauthenticated connections.

tunnel.InboundSocksUsername := 'chilkat123';
tunnel.InboundSocksPassword := 'password123';

// Start the listen/accept thread to begin accepting SOCKS proxy client connections.
// Listen on port 1080.
success := tunnel.BeginAccepting(1080);
if (success <> 1) then
  begin
    Memo1.Lines.Add(tunnel.LastErrorText);
    Exit;
  end;

// Now that a background thread is running a SOCKS proxy server that forwards connections
// through an SSH tunnel, it is possible to use any Chilkat implemented protocol that is SOCKS capable,
// such as HTTP, POP3, SMTP, IMAP, FTP, etc.  The protocol may use SSL/TLS because the SSL/TLS
// will be passed through the SSH tunnel to the end-destination.  Also, any number of simultaneous
// connections may be routed through the SSH tunnel.

// For this example, let's do a simple HTTPS request:
url := 'https://www.ethereum.org/';

http := TChilkatHttp.Create(Self);

// Indicate that the HTTP object is to use our portable SOCKS proxy/SSH tunnel running in our background thread.
http.SocksHostname := 'localhost';
http.SocksPort := 1080;
http.SocksVersion := 5;
http.SocksUsername := 'chilkat123';
http.SocksPassword := 'password123';

http.SendCookies := 1;
http.SaveCookies := 1;
http.CookieDir := 'memory';

// Do the HTTPS page fetch (through the SSH tunnel)
html := http.QuickGetStr(url);
if (http.LastMethodSuccess <> 1) then
  begin
    Memo1.Lines.Add(http.LastErrorText);
    Exit;
  end;

// Stop the background listen/accept thread:
waitForThreadExit := 1;
success := tunnel.StopAccepting(waitForThreadExit);
if (success <> 1) then
  begin
    Memo1.Lines.Add(tunnel.LastErrorText);
    Exit;
  end;

// Close the SSH tunnel (would also kick any remaining connected clients).
success := tunnel.CloseTunnel(waitForThreadExit);
if (success <> 1) then
  begin
    Memo1.Lines.Add(tunnel.LastErrorText);
    Exit;
  end;
end;