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.
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 (wietseATwzv.nl),
Department of Mathematics and Computing Science,
Eindhoven University of Technology
Den Dolech 2, P.O. Box 513,
5600 MB Eindhoven, The Netherlands
OpenBSD 3.6 June 23, 1997 1