判断当前网络是否连接了VPN，用于抓包什么的

isConnectedToVpn.swift

    private var isConnectedToVpn: Bool {
        if let settings = CFNetworkCopySystemProxySettings()?.takeRetainedValue() as? Dictionary<String, Any>,
            let scopes = settings["__SCOPED__"] as? [String:Any] {
            for (key, _) in scopes {
                if key.contains("tap") || key.contains("tun") || key.contains("ppp") || key.contains("ipsec") || key.contains("ipsec0") {
                    return true
                }
            }
        }
        return false
    }