TCPDCHK(8)                           System Manager's Manual                           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 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.

       -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

       The default locations of the tcpd access control tables are:


       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.

       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



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