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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


Mac OS X 10.6 - Generated Thu Sep 17 20:26:26 CDT 2009
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