NAME

       tcpdchk - tcp wrapper configuration checker

SYNOPSIS

       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 network
       configuration file.

       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 problem.

OPTIONS

       -a     Report access control rules that permit access without an explicit ALLOW keyword.

       -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 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 understands.

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.

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)