Swift

Upgrade an FTP Control Channel to TLS (ConvertToTls)

Demonstrates the Chilkat Ftp2.ConvertToTls method, which upgrades an already-connected clear FTP control channel to explicit TLS. It takes no arguments and is used with a manually staged connection created by ConnectOnly while Ssl is disabled.

Background: This exposes the explicit-FTPS AUTH TLS upgrade as a discrete step for the rare case where you need to do something on the clear connection first — inspect the greeting, apply a workaround — before securing it. In the normal case you simply set AuthTls and let Connect perform the upgrade automatically; this manual path exists for staged control.

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Swift


func chilkatTest() {
    var success: Bool = false

    //  Demonstrates the Ftp2.ConvertToTls method, which upgrades an already-connected clear FTP control
    //  channel to explicit TLS.  It takes no arguments.  It is used with a manually staged connection
    //  created by ConnectOnly while Ssl is disabled.

    let ftp = CkoFtp2()!

    ftp.hostname = "ftp.example.com"
    ftp.port = 21

    //  Connect in clear text first (Ssl is false).
    success = ftp.connectOnly()
    if success == false {
        print("\(ftp.lastErrorText!)")
        return
    }

    //  Upgrade the control channel to explicit TLS (AUTH TLS).
    success = ftp.convertToTls()
    if success == false {
        print("\(ftp.lastErrorText!)")
        return
    }

    //  Now authenticate over the encrypted control channel.
    ftp.username = "myFtpLogin"
    ftp.password = "myPassword"
    success = ftp.loginAfterConnectOnly()
    if success == false {
        print("\(ftp.lastErrorText!)")
        return
    }

    print("Control channel upgraded to TLS and logged in.")

    success = ftp.disconnect()
    if success == false {
        print("\(ftp.lastErrorText!)")
        return
    }


}