NAME
tcpdchk — check tcp wrapper configuration
SYNOPSYS
/usr/bin/tcpdchk
[-a]
[-d]
[-i
inet_conf]
[-v]
DESCRIPTION
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:
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.
Options
The following options are supported by
tcpdchk.
If no options are specified, then it uses the default location of the files.
- -a
Report access control rules that permit access without an explicit
ALLOW
keyword.
- -d
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.
- -v
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.
AUTHOR
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
FILES
The default locations of the
tcpd
access control tables are:
- /etc/hosts.allow
(daemon, client) pairs that are granted access.
- /etc/hosts.deny
(daemon, client) pairs that are denied access.
Printable version
