Xbase++

Request SSH X11 Forwarding

Demonstrates the Chilkat Ssh.SendReqX11Forwarding method, which sends an X11-forwarding request on a session channel. The arguments are the channel number, whether forwarding is limited to a single connection, and the X11 authentication protocol, cookie, and screen number.

Background: X11 forwarding lets a graphical program running on the remote host display its window on your local machine, tunneled over SSH. This is a low-level method that only sends the protocol request — your application is still responsible for the local X server side of the arrangement. The authentication cookie guards the forwarded display, so it should be a freshly generated value rather than a fixed constant.

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LOCAL nSuccess
LOCAL oSsh
LOCAL nSshPort
LOCAL cPassword
LOCAL nChannelNum
LOCAL nSingleConnection
LOCAL cAuthProt
LOCAL cAuthCookie
LOCAL nScreenNum

nSuccess := 0

//  Demonstrates the Ssh.SendReqX11Forwarding method, which sends an SSH X11-forwarding request
//  on a session channel.  The 1st argument is the channel number, the 2nd limits forwarding to a
//  single connection, and the 3rd through 5th supply the X11 authentication protocol, cookie,
//  and screen number.

oSsh := CreateObject("Chilkat.Ssh")

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

//  Open a session channel.  A negative return value indicates failure.
nChannelNum := oSsh:OpenSessionChannel()
IF (nChannelNum < 0)
    ? oSsh:LastErrorText
    oSsh:destroy()
    RETURN
ENDIF

//  Request X11 forwarding.  Named variables make each argument's meaning clear.
nSingleConnection := 0
cAuthProt := "MIT-MAGIC-COOKIE-1"
cAuthCookie := "d92f5e1a7c8b4306af17c2e5b9d43081"
nScreenNum := 0
nSuccess := oSsh:SendReqX11Forwarding(nChannelNum, nSingleConnection, cAuthProt, cAuthCookie, nScreenNum)
IF (nSuccess == 0)
    ? oSsh:LastErrorText
    oSsh:destroy()
    RETURN
ENDIF

? "X11 forwarding requested."

oSsh:Disconnect()

oSsh:destroy()