Swift

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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Swift


func chilkatTest() {
    var success: Bool = false

    //  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.

    let ssh = CkoSsh()!

    var sshPort: Int = 22
    success = ssh.connect(hostname: "ssh.example.com", port: sshPort)
    if success == false {
        print("\(ssh.lastErrorText!)")
        return
    }

    //  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.
    var password: String? = "mySshPassword"

    success = ssh.authenticatePw(login: "mySshLogin", password: password)
    if success == false {
        print("\(ssh.lastErrorText!)")
        return
    }

    //  Open a session channel.  A negative return value indicates failure.
    var channelNum: Int = ssh.openSessionChannel().intValue
    if channelNum < 0 {
        print("\(ssh.lastErrorText!)")
        return
    }

    //  Request X11 forwarding.  Named variables make each argument's meaning clear.
    var singleConnection: Bool = false
    var authProt: String? = "MIT-MAGIC-COOKIE-1"
    var authCookie: String? = "d92f5e1a7c8b4306af17c2e5b9d43081"
    var screenNum: Int = 0
    success = ssh.sendReqX11Forwarding(channelNum: channelNum, singleConnection: singleConnection, authProt: authProt, authCookie: authCookie, screenNum: screenNum)
    if success == false {
        print("\(ssh.lastErrorText!)")
        return
    }

    print("X11 forwarding requested.")

    ssh.disconnect()

}