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
Where possible, tcpdchk provides a helpful suggestion
to fix the problem.
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
Examine hosts.allow and hosts.deny files in
the current directory instead of the default
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.
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
The default locations of the tcpd access control
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.
tlid.conf(5)?, format of the tlid control file.
Wietse Venema (firstname.lastname@example.org),
Department of Mathematics and Computing Science,
Eindhoven University of Technology
Den Dolech 2, P.O. Box 513,
5600 MB Eindhoven, The Netherlands