“This article looks at how TCP Wrappers can be used to enhance
the security of a networked system…”
“The idea of the package is to provide “wrapper” daemons that
can be installed without any changes to existing software. Most
TCP/IP applications depend on the client-server model–that is,
when a connection is requested by a client, a server process is
started on the host to deal with it. TCP Wrappers works by
interposing an additional layer, or wrapper, between client and
server…”
“The core idea behind TCP Wrappers is that of an access-control
policy… Access can be controlled per host, per service, or in
combinations thereof…”