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dns-ng

Section: User Commands (1)
Updated: dnsutl
Index 

NAME

dns-ng - generate /etc/netgroup entries from DNS tables 

SYNOPSIS

dns-ng[option...][infile[outfile]]
dns-ng-Help
dns-ng-VERSion 

DESCRIPTION

Thedns-ngprogram is used togenerate a netgroup file from DNS information.

Each host is given a netgroup.Higher-level netgroups can be created frompatterns applied to the HINFO field. 

OPTIONS

The following options are understood:
-Help

Provide some help with using thedns-ngprogram.
-VERSion

Print the version of thedns-ngprogram being executed.
-Group name pattern

In addition to one netgroup for each host,a netgroup of the given name will be created for allhosts with a second HINFO field matching the given pattern.This option may be specified more than once.The first pattern match found is used,machines are not placed in more than one of these groups.Patterns are regular expressions.
-Delete_Foreign_Names
This option may be used to delete A and NS records whichreference names in domains outside the domain specifiedin the closest preceeding SOA record.
-Idirectory

This option may be used to set the search path for include files.

All other options will produce a diagnostic error.Options may be abbreviated,the minimum abbreviation is shown in upper-case.Options are case insensitive.Options and file names may be mixed arbitrarily on the command line.
 

EXIT STATUS

Thedns-ngcommand will exit with a status of 1 on any error.Thedns-ngcommand will only exit with a status of 0 if there are no errors. 

EXAMPLE

The idea is that you have all of the information concerning each computerin the one file. This makes it less likely that something will beomitted, and simpler to change if the name or IP address changes.

By using netgroups, you can assign NFS mount permissions(the /etc/exports file) and rlogin permissions (the/etc/hosts.equiv file) based on the kind of machine they are.

Given a database file called ``example.com'' and which containsthe following text

$origin example.com.@       in      soa     exmaple.com. hostmaster.example.com. (                        990101001       ; serial                        10800           ; refresh: 3 hours                        1800            ; retry: 30 minutes                        3600000         ; expire: 1000 hours                        86400 )         ; minimum: 24 hoursmercury in      a       182.168.1.1        ether   a       2:7:1:f:b7:fb        in      hinfo   "IBM-PC 486" "MSDOS"venus   in      a       182.168.1.2        ether   a       2:60:8c:2d:20:c4        in      hinfo   "IBM-6000/590" "UNIX AIX 3.2.5"earth   in      a       182.168.1.3        ether   a       08:00:20:79:1f:0d        in      hinfo   "Sun-4/5 (SPARCstation 5)" "UNIX SunOS 5.4"mars    in      a       182.168.1.4        ether   a       aa:0:4:0:86:53        in      hinfo   "DEC-Alpha 3000" "UNIX OSF/1 V3.2"jupiter in      a       182.168.1.5        ether   a       8:0:2b:99:49:ad        in      hinfo   "DEC-VXT2000+ XTerminal" "Other: X11R5"        bootp   tc      dec-vxt-2000saturn  in      a       182.168.1.6        ether   a       0:40:10:56:43:57        in      hinfo   "Apple-Macintosh IIsi" "MacOS 7.5.3"neptune in      a       182.168.1.7        ether   a       0:aa:0:69:7c:5b        in      hinfo   "IBM-PC" "MSDOS"uranus  in      a       182.168.1.8        ether   a       0:0:e8:a4:0:25        in      hinfo   "IBM-PC" "MSDOS"pluto   in      a       182.168.1.9        ether   a       8:0:9:d:2a:87        in      hinfo   "HP-Laser-Jet 4" "None"lp      in      cname   pluto
You can generate the /etc/netgroup file using the following command
% dns-ng example.com /etc/netgroup \        -g pc MSDOS -g mac MacOS \        -g unix UNIX -g other '.*'%
Here is what you would see as the output
mercury (mercury,-,) (mercury.example.com,-,)venus (venus,-,) (venus.example.com,-,)earth (earth,-,) (earth.example.com,-,)mars (mars,-,) (mars.example.com,-,)jupiter (jupiter,-,) (jupiter.example.com,-,)saturn (saturn,-,) (saturn.example.com,-,)neptune (neptune,-,) (neptune.example.com,-,)uranus (uranus,-,) (uranus.example.com,-,)pluto (pluto,-,) (pluto.example.com,-,) (lp,-,) (lp.example.com,-,)unix venus earth marsmac saturnpc mercury neptune uranusother jupiter pluto
Note that the output uses relative names. 

Makefile

All of this can be automated using the following makefile fragment:
/etc/netgroup: example.com        dns-ng example.com $@ -g pc MSDOS \                -g mac MacOS -g unix UNIX -g other '.*'
By doing this, all you need to do is edit the example.com file,and the use the make(1) command to bring everything up-to-date.

If you were using NIS, NIS+ or LDAP you would update them, rather thanthe static file, especially since on many systems the static file doesn'tdo anything.
 

COPYRIGHT

dns-ng version 1.8,
Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1999, 2000, 2001, 2003, 2004, 2005, 2006 Peter Miller;All rights reserved.

Thedns-ngprogram comes with ABSOLUTELY NO WARRANTY;for details use the 'dns-ng -VERSion Warranty' command.Thedns-ngprogram is free software, and you are welcome toredistribute it under certain conditions;for details use the 'dns-ng -VERSion Redistribution' command.
 

AUTHOR

Peter MillerE-Mail:millerpAATTcanb.auug.org.au
/\/\*Web:http://www.canb.auug.org.au/~millerp/


 

Index

NAME
SYNOPSIS
DESCRIPTION
OPTIONS
EXIT STATUS
EXAMPLE
Makefile
COPYRIGHT
AUTHOR

This document was created byman2html,using the manual pages.