TCPDCHK(8)                                             TCPDCHK(8)

       tcpdchk - tcp wrapper configuration checker

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

       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 or tlid network configuration files.

       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; inappro-
       priate 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.

       -a     Report access  control  rules  that  permit  access
              without  an  explicit  ALLOW  keyword. This applies
              only when the extended access control  language  is
              enabled (build with -DPROCESS_OPTIONS).

       -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 or tlid.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 under-

       The default locations of the tcpd  access  control  tables


       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.
       tlid.conf(5), format of the tlid control file.

       Wietse Venema (,
       Department of Mathematics and Computing Science,
       Eindhoven University of Technology
       Den Dolech 2, P.O. Box 513,
       5600 MB Eindhoven, The Netherlands