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NAME
     tcpdchk - tcp wrapper configuration checker

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

DESCRIPTION
     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; 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.

OPTIONS
     -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.  Dae-
          mon 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.

FILES
     The default locations of the tcpd access control tables are:


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

SEE ALSO
     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.

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

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