Delphi ActiveX

Send an SSH IGNORE Message

Demonstrates the Chilkat Ssh.SendIgnore method, which sends an SSH IGNORE message. It takes no arguments. The server does not reply, but a successful send helps confirm the connection is still writable. No channel is required.

Background: The SSH IGNORE message is discarded by the peer by design; its usefulness is as a lightweight keep-alive or liveness probe. Because it exercises the actual write path, a successful SendIgnore is stronger evidence than CheckConnection that the link is still usable, without side effects on any channel.

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var
success: Integer;
ssh: TChilkatSsh;
sshPort: Integer;
password: WideString;

begin
success := 0;

//  Demonstrates the Ssh.SendIgnore method, which sends an SSH IGNORE message.  It takes no
//  arguments.  The server does not reply, but a successful send helps confirm the connection is
//  still writable.  No channel is required.

ssh := TChilkatSsh.Create(Self);

//  Connect to the SSH server.  Port 22 is the usual SSH port.
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;

//  Send an IGNORE message to verify the connection is still writable.
success := ssh.SendIgnore();
if (success = 0) then
  begin
    Memo1.Lines.Add(ssh.LastErrorText);
    Exit;
  end;
Memo1.Lines.Add('IGNORE message sent.');

ssh.Disconnect();