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x SuSE Linux 13.1-RELEASEx
TCPDCHK(8) System Manager's Manual 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 poten-
tial 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 on.
Where possible, tcpdchk provides a helpful suggestion to fix the prob-
lem.
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 -DPRO-
CESS_OPTIONS).
-d Examine hosts.allow and hosts.deny files in the current direc-
tory 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 dis-
crepancies 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
TCPDCHK(8)
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