tcpdchk man page on FreeBSD

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TCPDCHK(8)							    TCPDCHK(8)

       tcpdchk - tcp wrapper configuration checker

       tcpdchk [-a] [-d] [-i inet_conf] [-v]

       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‐

       -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‐

       -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‐

       The default locations of the tcpd access control tables are:


       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 (,
       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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