Xbase++

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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LOCAL nSuccess
LOCAL oSsh
LOCAL nSshPort
LOCAL cPassword

nSuccess := 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.

oSsh := CreateObject("Chilkat.Ssh")

//  Connect to the SSH server.  Port 22 is the usual SSH port.
nSshPort := 22
nSuccess := oSsh:Connect("ssh.example.com", nSshPort)
IF (nSuccess == 0)
    ? oSsh:LastErrorText
    oSsh:destroy()
    RETURN
ENDIF

//  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.
cPassword := "mySshPassword"

nSuccess := oSsh:AuthenticatePw("mySshLogin", cPassword)
IF (nSuccess == 0)
    ? oSsh:LastErrorText
    oSsh:destroy()
    RETURN
ENDIF

//  Send an IGNORE message to verify the connection is still writable.
nSuccess := oSsh:SendIgnore()
IF (nSuccess == 0)
    ? oSsh:LastErrorText
    oSsh:destroy()
    RETURN
ENDIF

? "IGNORE message sent."

oSsh:Disconnect()

oSsh:destroy()