libauthen-libwrap-perl 0.23-1build6 (amd64 binary) in ubuntu kinetic

 The Authen::Libwrap module allows you to access the hosts_ctl() function from
 Wietse Venema's popular TCP Wrappers security package. This allows validation
 of network access from Perl programs against the system-wide hosts.allow file.
 .
 If any of the parameters to hosts_ctl() are not known (i.e. username due to
 lack of an identd server), the constant STRING_UNKNOWN may be passed to the
 function.