Computer Science
TCPDCHK(8) TCPDCHK(8)
NAME
tcpdchk - tcp wrapper configuration checker
SYNOPSYS
tcpdchk [-a] [-d] [-i inet_conf] [-v]
DESCRIPTION
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; inappro-
priate 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.
OPTIONS
-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 -DPROCESS_OPTIONS).
-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 under-
stands.
FILES
The default locations of the tcpd access control tables
are:
/etc/hosts.allow
/etc/hosts.deny
SEE ALSO
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.
AUTHORS
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
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