code: func (c *Configurator) IncomingRPCConfig() *tls.Config {
  	c.log("IncomingRPCConfig")
  	config := c.commonTLSConfig(c.verifyIncomingRPC())
  	config.GetConfigForClient = func(*tls.ClientHelloInfo) (*tls.Config, error) {
  		return c.IncomingRPCConfig(), nil
  	}
  	return config
  }
docs: // IncomingRPCConfig generates a *tls.Config for incoming RPC connections.