Delphi DLL

Send an SSH IGNORE Message over SFTP

Demonstrates the Chilkat SFtp.SendIgnore method, which sends an SSH IGNORE message. It takes no arguments. The server sends no reply, but a successful send helps confirm the connection is still writable. No SFTP file handle is required.

Background: The SSH IGNORE message is discarded by the peer by design; its value is as a lightweight keep-alive or liveness probe. During a long-idle SFTP session — for instance while waiting between scheduled transfers — a periodic SendIgnore both keeps the connection from being dropped for inactivity and proves the link is still usable, without touching any file.

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var
success: Boolean;
sftp: HCkSFtp;
port: Integer;
password: PWideChar;

begin
success := False;

//  Demonstrates the SFtp.SendIgnore method, which sends an SSH IGNORE message.  It takes no
//  arguments.  The server sends no reply, but a successful send helps confirm the connection is
//  still writable.  No SFTP file handle is required.

sftp := CkSFtp_Create();

//  Step 1: Connect the SSH transport.  Port 22 is the usual port.
port := 22;
success := CkSFtp_Connect(sftp,'sftp.example.com',port);
if (success = False) then
  begin
    Memo1.Lines.Add(CkSFtp__lastErrorText(sftp));
    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 := CkSFtp_AuthenticatePw(sftp,'mySshLogin',password);
if (success = False) then
  begin
    Memo1.Lines.Add(CkSFtp__lastErrorText(sftp));
    Exit;
  end;

//  Step 3: Open the SFTP subsystem.  This must be done after authentication and before any
//  file or directory operations.
success := CkSFtp_InitializeSftp(sftp);
if (success = False) then
  begin
    Memo1.Lines.Add(CkSFtp__lastErrorText(sftp));
    Exit;
  end;

//  Send an IGNORE message to verify the connection is still writable.
success := CkSFtp_SendIgnore(sftp);
if (success = False) then
  begin
    Memo1.Lines.Add(CkSFtp__lastErrorText(sftp));
    Exit;
  end;
Memo1.Lines.Add('IGNORE message sent.');

CkSFtp_Disconnect(sftp);

CkSFtp_Dispose(sftp);