Enable the allow list for function fname and add host to it.
Registers a function to be exported by the RPC library.
Enable the deny list for function fname and add host to it.
Removes a function from the RPC function registry, clearing any ACL rules.
Calls exported function fn on host hostname, with parameters ..., returning whatever the function returns, or false.
Returns a component.proxy()-like table from the functions on hostname with names matching filter.