func ConfigAndEnvProcessing() error {
	configPath := filepath.Dir(root.IstioConfig)
	baseName := filepath.Base(root.IstioConfig)
	configType := filepath.Ext(root.IstioConfig)
	configName := baseName[0 : len(baseName)-len(configType)]
	if configType != "" {
		configType = configType[1:]
	}

	// Allow users to override some variables through $HOME/.istioctl/config.yaml
	// and environment variables.

        if (StringUtil.isNotBlank(scriptType)) {
            return scriptType;
        }
        return Constants.DEFAULT_SCRIPT;
    }

    public enum ConfigType {
        WEB("W"), FILE("F"), DATA("D");

        private final String typePrefix;

        ConfigType(final String typePrefix) {
            this.typePrefix = typePrefix;
        }

        public String getTypePrefix() {
            return typePrefix;

	rbacTCP  []*rbactcp.RBAC
}

type parsedListener struct {
	filterChains []*filterChain
}

func getFilterConfig(filter *listener.Filter, out proto.Message) error {
	switch c := filter.ConfigType.(type) {
	case *listener.Filter_TypedConfig:
		if err := c.TypedConfig.UnmarshalTo(out); err != nil {
			return err
		}
	}
	return nil
}