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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 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

       -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

       -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

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