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TCPDCHK(8)              OpenBSD 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(8) 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(8) network configuration file.

     tcpdchk reports problems such as non-existent pathnames; services that
     appear in tcpd(8) access control rules, but are not controlled by
     tcpd(8); services that should not be wrapped; non-existent host names or
     non-internet address forms; occurrences of host aliases instead of offi-
     cial 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.

     The options are as follows:

     -a      Report access control rules that permit access without an explic-
             it 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 configuration file, or when you wish to test
             with a non-default 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 discrep-
             ancies between what you want and what the program understands.

     /etc/hosts.allow  access control table (allow list)
     /etc/hosts.deny   access control table (deny list)

     hosts_access(5), hosts_options(5), inetd.conf(5), tcpdmatch(8)

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

OpenBSD 3.9                      June 23, 1997                               1


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