Visual FoxPro

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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LOCAL lnSuccess
LOCAL loSftp
LOCAL lnPort
LOCAL lcPassword

lnSuccess = 0

*  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.

loSftp = CreateObject('Chilkat.SFtp')

*  Step 1: Connect the SSH transport.  Port 22 is the usual port.
lnPort = 22
lnSuccess = loSftp.Connect("sftp.example.com",lnPort)
IF (lnSuccess = 0) THEN
    ? loSftp.LastErrorText
    RELEASE loSftp
    CANCEL
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.
lcPassword = "mySshPassword"

lnSuccess = loSftp.AuthenticatePw("mySshLogin",lcPassword)
IF (lnSuccess = 0) THEN
    ? loSftp.LastErrorText
    RELEASE loSftp
    CANCEL
ENDIF

*  Step 3: Open the SFTP subsystem.  This must be done after authentication and before any
*  file or directory operations.
lnSuccess = loSftp.InitializeSftp()
IF (lnSuccess = 0) THEN
    ? loSftp.LastErrorText
    RELEASE loSftp
    CANCEL
ENDIF

*  Send an IGNORE message to verify the connection is still writable.
lnSuccess = loSftp.SendIgnore()
IF (lnSuccess = 0) THEN
    ? loSftp.LastErrorText
    RELEASE loSftp
    CANCEL
ENDIF

? "IGNORE message sent."

loSftp.Disconnect()

RELEASE loSftp