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HP-UX 11i Version 3: February 2007

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tcpdchk — check tcp wrapper configuration


/usr/bin/tcpdchk [-a] [-d] [-i inet_conf] [-v]


tcpdchk examines the tcp wrapper configuration and reports all potential and real problems it can encounter. The command 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 configuration file.

tcpdchk reports the following types of problems:

  • 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.

Wherever possible, tcpdchk provides a helpful suggestion to fix the problem.


The following options are supported by tcpdchk. If no options are specified, then it uses the default location of the files.


Report access control rules that permit access without an explicit ALLOW keyword.


Examine the 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 configuration file, or when you suspect that tcpdchk is using the wrong file. inet_conf is the path name of the inetd.conf configuration file whose entries you want to examine.


Display the contents of each access control rule. Daemon lists, client lists, shell commands and options are shown in a printable format. The display helps you find any discrepancies between what you want and what tcpdchk understands for the access control rules.


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


The default locations of the tcpd access control tables are:


(daemon, client) pairs that are granted access.


(daemon, client) pairs that are denied access.


tcpdmatch(1), explains what tcpd would do in specific cases.

inetd.conf(4), format of the inetd control file.

hosts_access(5), format of the tcpd access control tables.

hosts_options(5), format of the language extensions.

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