(Delphi DLL) Multiple Hop SSH to SFTP

Demonstrates how to SFTP through an intermediate SSH server (multiple hop). The scheme looks like this:

Application => ServerSSH1 => ServerSFtp

The ConnectThroughSsh method is added in Chilkat version 9.5.0.55 to accomplish this task.

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, SFtp, Ssh;

...

procedure TForm1.Button1Click(Sender: TObject);
var
ssh1: HCkSsh;
hostname: PWideChar;
port: PWideChar;
success: Boolean;
sftp: HCkSFtp;
remoteFilePath: PWideChar;
localFilePath: PWideChar;

begin
// 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 := '192.168.1.111';
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;

// 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 (for SFTP)
// Note: Any number of connections may be simultaneously tunneled through a single
// existing SSH connection.
sftp := CkSFtp_Create();

// Connect to some SSH/SFTP server through ssh1.
success := CkSFtp_ConnectThroughSsh(sftp,ssh1,'sftp.someremoteserver.com',22);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkSFtp__lastErrorText(sftp));
    Exit;
  end;

// Authenticate with the SFTP server. 
success := CkSFtp_AuthenticatePw(sftp,'myLogin','myPassword');
if (success <> True) then
  begin
    Memo1.Lines.Add(CkSFtp__lastErrorText(sftp));
    Exit;
  end;

// After authenticating, the SFTP subsystem must be initialized:
success := CkSFtp_InitializeSftp(sftp);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkSFtp__lastErrorText(sftp));
    Exit;
  end;

// Upload from the local file to the SSH server.
// Important -- the remote filepath is the 1st argument,
// the local filepath is the 2nd argument;
remoteFilePath := 'hamlet.xml';
localFilePath := 'c:/temp/hamlet.xml';

success := CkSFtp_UploadFileByName(sftp,remoteFilePath,localFilePath);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkSFtp__lastErrorText(sftp));
    Exit;
  end;

Memo1.Lines.Add('Success.');

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

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

CkSsh_Disconnect(ssh1);

CkSsh_Dispose(ssh1);
CkSFtp_Dispose(sftp);

end;