(Delphi DLL) FTP through SSH Tunnel

Demonstrates how to FTP through an SSH tunnel.

The Chilkat SSH tunnel object is used to create a portable SSH tunnel w/ dynamic port forwarding on a background thread that the foreground thread can use for establishing connections through an SSH tunnel.

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

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Global, SshTunnel, Ftp2;

...

procedure TForm1.Button1Click(Sender: TObject);
var
chilkatGlob: HCkGlobal;
success: Boolean;
tunnel: HCkSshTunnel;
sshHostname: PWideChar;
sshPort: Integer;
ftp: HCkFtp2;
localPath: PWideChar;
remoteFilename: PWideChar;
waitForThreadExit: Boolean;

begin
// Starting in v9.5.0.49, all Chilkat classes can be unlocked at once at the beginning of a program
// by calling UnlockBundle.  It requires a Bundle unlock code.
chilkatGlob := CkGlobal_Create();
success := CkGlobal_UnlockBundle(chilkatGlob,'Anything for 30-day trial.');
if (success <> True) then
  begin
    Memo1.Lines.Add(CkGlobal__lastErrorText(chilkatGlob));
    Exit;
  end;

// This example requires Chilkat version 9.5.0.50 or greater.
tunnel := CkSshTunnel_Create();

sshHostname := 'www.my-ssh-server.com';
sshPort := 22;

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

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

// Indicate that the background SSH tunnel thread will behave as a SOCKS proxy server
// with dynamic port forwarding:
CkSshTunnel_putDynamicPortForwarding(tunnel,True);

// 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.

CkSshTunnel_putInboundSocksUsername(tunnel,'chilkat123');
CkSshTunnel_putInboundSocksPassword(tunnel,'password123');

// Start the listen/accept thread to begin accepting SOCKS proxy client connections.
// Listen on port 1080.
success := CkSshTunnel_BeginAccepting(tunnel,1080);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkSshTunnel__lastErrorText(tunnel));
    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 Socket, 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.

// Let's do an FTP upload through the SSH tunnel.  Both the control and data connections 
// go through the tunnel.
ftp := CkFtp2_Create();

CkFtp2_putHostname(ftp,'ftp.example.com');
CkFtp2_putUsername(ftp,'login');
CkFtp2_putPassword(ftp,'password');

// Indicate that the FTP2 object is to use our portable SOCKS proxy/SSH tunnel running in our background thread.
CkFtp2_putSocksHostname(ftp,'localhost');
CkFtp2_putSocksPort(ftp,1080);
CkFtp2_putSocksVersion(ftp,5);
CkFtp2_putSocksUsername(ftp,'chilkat123');
CkFtp2_putSocksPassword(ftp,'password123');

// Connect to the FTP server
success := CkFtp2_ConnectOnly(ftp);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkFtp2__lastErrorText(ftp));
    Exit;
  end;

// Authenticate with the FTP server.
success := CkFtp2_LoginAfterConnectOnly(ftp);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkFtp2__lastErrorText(ftp));
    Exit;
  end;

// Change to the remote directory where the file will be uploaded.
success := CkFtp2_ChangeRemoteDir(ftp,'junk');
if (success <> True) then
  begin
    Memo1.Lines.Add(CkFtp2__lastErrorText(ftp));
    Exit;
  end;

// Upload a file.
localPath := '/temp/hamlet.xml';
remoteFilename := 'hamlet.xml';

success := CkFtp2_PutFile(ftp,localPath,remoteFilename);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkFtp2__lastErrorText(ftp));
    Exit;
  end;

// This closes the SSH channel within the SSH tunnel,
// and thus closes the connection with the FTP server.
success := CkFtp2_Disconnect(ftp);

Memo1.Lines.Add('File Uploaded!');

// Stop the background listen/accept thread:
waitForThreadExit := True;
success := CkSshTunnel_StopAccepting(tunnel,waitForThreadExit);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkSshTunnel__lastErrorText(tunnel));
    Exit;
  end;

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

CkGlobal_Dispose(chilkatGlob);
CkSshTunnel_Dispose(tunnel);
CkFtp2_Dispose(ftp);

end;