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dns-dhcp

Section: User Commands (1)
Updated: dnsutl
Index 

NAME

dns-dhcp - generate dhcp tables from DNS tables 

SYNOPSIS

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

DESCRIPTION

Thedns-dhcpprogram is used to generate portions of the/etc/dhcp.conffile from the forward DNS tables,augmented with ``ether a'' entries.

This is supplemented with an additional ``dhcp'' class, so that extrainformation may be defined.

The output format is described in thedhcpd (8)manual entry.Usually, the output of the dns-dhcp command is included into the/etc/dhcp.conffile, rather then define the entire file with the output in the dns-dhcp command. 

DHCP TYPES

The ``dhcp'' class has the following defined types:
filename
The absolute path of the bootfile.
 

THE * DEFAULT

The special host name ``*'' may be used to specify defaults.These may be over-riden by specific entries.The most recently see default of each type name is remembered.This may be exploited,for example,to set different servers and gateways for different networks.
 

OPTIONS

The following options are understood:
-Help

Provide some help with using thedns-dhcpprogram.
-VERSion

Print the version of thedns-dhcpprogram being executed.

All other options will produce a diagnostic error.

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-dhcpcommand will exit with a status of 1 on any error.Thedns-dhcpcommand 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.

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/dhcp.conf file using the following command
% dns-dhcp example.com /etc/dhcp.conf%
Here is what you would see as the output
host mercury {        fixed-address 182.168.1.1;        hardware ethernet 02:07:01:0f:b7:fb;}host venus {        fixed-address 182.168.1.2;        hardware ethernet 02:60:8c:2d:20:c4;}host earth {        fixed-address 182.168.1.3;        hardware ethernet 08:00:20:79:1f:0d;}host mars {        fixed-address 182.168.1.4;        hardware ethernet aa:00:04:00:86:53;}host jupiter {        fixed-address 182.168.1.5;        hardware ethernet 08:00:2b:99:49:ad;}host saturn {        fixed-address 182.168.1.6;        hardware ethernet 00:40:10:56:43:57;}host neptune {        fixed-address 182.168.1.7;        hardware ethernet 00:aa:00:69:7c:5b;}host uranus {        fixed-address 182.168.1.8;        hardware ethernet 00:00:e8:a4:00:25;}host pluto {        fixed-address 182.168.1.9;        hardware ethernet 08:00:09:0d:2a:87;}
Note that the output uses relative names. 

Makefile

All of this can be automated using the following makefile fragment:
/etc/dhcp.conf: example.com        dns-dhcp example.com $@
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.
 

COPYRIGHT

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

AUTHOR

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


 

Index

NAME
SYNOPSIS
DESCRIPTION
DHCP TYPES
THE * DEFAULT
OPTIONS
EXIT STATUS
EXAMPLE
Makefile
COPYRIGHT
AUTHOR

This document was created byman2html,using the manual pages.