Swift

SSH Tunnel Uncommon Options

Demonstrates the UncommonOptions property, which enables optional behavior for uncommon requirements. The default is an empty string; provide a comma-separated list of keywords to enable more than one option. Available keywords are listed in the reference documentation.

Background: This is a catch-all for narrow workarounds that do not warrant their own properties — forcing a specific signature algorithm, disabling the periodic keep-alive, removing weak MACs, bypassing a VPN on Android, and so on. Most applications never set it. When you do, it is usually to satisfy a particular server's quirk or a specific security requirement, and the exact keyword matters, so consult the documented list rather than guessing.

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Swift


func chilkatTest() {
    var success: Bool = false

    //  Demonstrates the SshTunnel.UncommonOptions property, which enables optional behavior for
    //  uncommon requirements.  The default is an empty string, appropriate for most applications.
    //  Provide a comma-separated list of keywords to enable more than one option.

    let tunnel = CkoSshTunnel()!

    //  For example, disable the periodic keep-alive ignore message and remove weak MAC algorithms
    //  from those offered.  Available keywords are listed in the reference documentation.
    tunnel.uncommonOptions = "NoKeepAliveIgnoreMsg,no-weak-mac-algs"

    tunnel.destHostname = "db.internal.example.com"
    tunnel.destPort = 5432

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

    var listenPort: Int = 1080
    success = tunnel.beginAccepting(listenPort: listenPort)
    if success == false {
        print("\(tunnel.lastErrorText!)")
        return
    }

    print("Tunnel established.")

    var waitForThreadExit: Bool = true
    success = tunnel.closeTunnel(waitForThreads: waitForThreadExit)
    if success == false {
        print("\(tunnel.lastErrorText!)")
        return
    }


}