tcpdchk - tcp wrapper configuration checker

       Wietse Venema (wietse@wzv.win.tue.nl),
       Department of Mathematics and Computing Science,
       Eindhoven University of Technology
       Den Dolech 2, P.O. Box 513,
       5600 MB Eindhoven, The Netherlands

                                                                                                      TCPDCHK(8)

tcpdchk  examines your tcp wrapper configuration and reports all potential and real problems it can find.
       The program examines  the  tcpd  access  control  files  (by  default,  these  are  /etc/hosts.allow  and
       /etc/hosts.deny),  and  compares  the  entries  in  these  files  against  entries  in  the inetd network
       configuration file.

       tcpdchk reports problems such as non-existent pathnames; services that  appear  in  tcpd  access  control
       rules,  but  are  not controlled by tcpd; services that should not be wrapped; non-existent host names or
       non-internet address forms; occurrences of host aliases instead of official  host  names;  hosts  with  a
       name/address  conflict;  inappropriate  use  of  wildcard patterns; inappropriate use of NIS netgroups or
       references to non-existent NIS netgroups;  references  to  non-existent  options;  invalid  arguments  to
       options; and so on.

       Where possible, tcpdchk provides a helpful suggestion to fix the problem.

       The default locations of the tcpd access control tables are:

       /etc/hosts.allow/etc/hosts.deny

       tcpdchk - tcp wrapper configuration checker

       -a     Report access control rules that permit access without an explicit ALLOW keyword.

       -d     Examine hosts.allow and hosts.deny files in the current directory instead of the default ones.

       -i inet_conf
              Specify  this option when tcpdchk is unable to find your inetd.conf network configuration file, or
              when you suspect that the program uses the wrong one.

       -v     Display the contents of each access control rule.  Daemon lists, client lists, shell commands  and
              options  are  shown  in  a  pretty-printed  format;  this  makes  it  easier  for  you to spot any
              discrepancies between what you want and what the program understands.

tcpdmatch(8), explain what tcpd would do in specific cases.
       hosts_access(5), format of the tcpd access control tables.
       hosts_options(5), format of the language extensions.
       inetd.conf(5), format of the inetd control file.

       tcpdchk [-a] [-d] [-i inet_conf] [-v]