AlwaysLocal is a HandleLocalPredicate that requests local handling for all addresses.

ListenLocalTCP creates a net.Listener that returns all inbound shadowsocks connections to the returned listener rather than dialing upstream.

ListenLocalTCPOptions creates a net.Listener that returns some inbound shadowsocks connections to the returned listener.

NewCipherListWithConfigs creates a CipherList with the given configuration.

UpdateCipherList replaces the contents of the given cipherList with the configuration given.

HandleLocalPredicate is a type of function that determines whether to handle an upstream address locally or not.