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tcpdchk (8)
  • >> tcpdchk (8) ( Solaris man: Команды системного администрирования )
  • tcpdchk (8) ( FreeBSD man: Команды системного администрирования )
  • tcpdchk (8) ( Linux man: Команды системного администрирования )
         tcpdchk - tcp wrapper configuration checker
         tcpdchk [-a] [-d] [-i inet_conf] [-v]
         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 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
         Where possible, tcpdchk provides a helpful suggestion to fix
         the problem.
         -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
         -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  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.  Dae-
              mon 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.
         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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