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TCPDCHK(8)                           System Manager's Manual                           TCPDCHK(8)

NAME
       tcpdchk - tcp wrapper configuration checker

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

DESCRIPTION
       tcpdchk  examines  your tcp wrapper configuration and reports all potential and real prob‐
       lems 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.

OPTIONS
       -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 configu‐
              ration 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 eas‐
              ier  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.

AUTHORS
       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)

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