/usr/sbin/dhcp-edit is in fai-server 3.4.8ubuntu5.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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# $Id$
#*********************************************************************
#
# dhcp-edit -- managing dhcpd entries made easy
#
# This script is part of FAI (Fully Automatic Installation)
# Copyright (C) 2010 Thomas Lange, lange@informatik.uni-koeln.de
# Universitaet zu Koeln
#
#*********************************************************************
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#*********************************************************************
# TODO
# -q quiet: do not print error if host/mac entry not found, exit code 0
$dhcpdconf=(-d "/etc/dhcp") ? "/etc/dhcp/dhcpd.conf" : "/etc/dhcp3/dhcpd.conf";
$modified=0; # 1 if dhcpd.conf was modified
our ($opt_p,$opt_d,$opt_h,$opt_n,$opt_r);
use Pod::Usage;
use Getopt::Std;
getopts('p:dhnr') || pod2usage(-msg => "edit-dhcp", -verbose => 2);
$opt_h && pod2usage(-msg => "edit-dhcp",-verbose => 1);
($hostname,$mac,$ip)= @ARGV;
$hostname || pod2usage(-msg => "edit-dhcp",-verbose => 1);
$ip && merror(4,"$ip is not a correct IP address") unless $ip =~ /^[.0-9]{7,15}$/i;
read_dhcpd_conf();
if ($opt_r) {
$mac=$hostname;
# create empty entry, remove entry
# set flag if an entry was found. print warning if entry not found
foreach (@dhcpd) {
next if /^\s*#/; # do not change comments
do {$_="XXX ENTRY DELETED XXX\n";$modified++} if m/host\s+$hostname\b.+hardware\s+ethernet.+;/;
do {$_="XXX ENTRY DELETED XXX\n";$modified++} if m/host\s+.+hardware\s+ethernet\s+$mac[\s+;]/i;
}
merror(6,"Entry $hostname can not be removed. Not found.\n") unless $modified;
print "$modified entry/entries removed.\n" if $modified;
} else {
$mac || merror(5,"Please specify hostname and MAC address.");
merror(4,"$hostname is not a correct host name") unless $hostname =~ /^[.0-9a-z-]+$/i;
merror(4,"$mac is not a correct MAC address") unless $mac =~ /^([0-9a-f]{1,2}(:|$)){6}$/i;
# grep all lines if the entry already exists
foreach (@dhcpd) {
next if /^\s*#/; # do not change comments
merror(7,"$hostname already exists in dhcpd.conf") if m/host\s+$hostname\b/;
merror(7,"MAC address $mac already exists in dhcpd.conf") if m/hardware\s+ethernet\s+$mac[\s+;]/i;
}
}
# check if executed as root
merror(3,"Terminated. $0 can only be run as root.") unless ($< == 0);
add_entry($hostname,$ip) unless $opt_r;
write_dhcpd();
restart_dhcpd();
exit 0;
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
sub merror {
$error = shift;
warn "$0 ERROR: @_\n";
exit $error;
}
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
sub read_dhcpd_conf {
# read the whole dhcpd.conf
open(DHCP,"$dhcpdconf") || die "Can't read $dhcpdconf. $!\n";
@dhcpd = <DHCP>;
close(DHCP);
}
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
sub add_entry {
my @new;
my ($hostname,$ip) = @_;
$ip=$hostname unless $ip;
# if -p was not given
unless (defined $opt_p) {
$modified=1;
push @dhcpd, "host $hostname {hardware ethernet $mac;fixed-address $ip;}\n";
print "Entry added: host $hostname {hardware ethernet $mac;fixed-address $ip;}\n" if $modified;
return;
}
# add new entry before line matching $opt_p
# if $opt_p matches multiple times, also the new entry is added multiple times
foreach (@dhcpd) {
if ($_ =~ /$opt_p/o) {
push @new, "host $hostname {hardware ethernet $mac;fixed-address $ip;}\n";
print "Entry added: host $hostname {hardware ethernet $mac;fixed-address $ip;}\n";
$modified=1;
}
push @new,$_;
}
@dhcpd = @new;
}
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
sub write_dhcpd {
if ($opt_d) {
print "DRY RUN. Nothing changed.";
return;
}
unless ($modified) {
print "Nothing changed.";
return;
}
@dhcpd = grep(!/^XXX ENTRY DELETED XXX\n$/, @dhcpd);
# print @dhcpd;
open(DHCP," >$dhcpdconf") || die "Can't write $dhcpdconf. $!\n";
print DHCP @dhcpd;
close(DHCP);
}
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
sub restart_dhcpd {
if ($opt_d) {
print "DRY RUN. Did not restart dhcp daemon.\n";
}
if ($opt_n) {
print "Did not restart dhcp daemon.\n";
}
unless ($modified) {
print "No modifications.\n";
}
if ($opt_d || $opt_n || $modified==0) {
print "Did not restart dhcp daemon.\n";
return;
}
(-x "/etc/init.d/isc-dhcp-server") and print qx#/etc/init.d/isc-dhcp-server# or
print qx#/etc/init.d/dhcp3-server restart#;
}
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
__END__
=head1 NAME
dhcp-edit - add or and remove entries to/from dhcpd.conf
=head1 SYNOPSIS
dhcp-edit [OPTION] HOST MAC [IP]
=head1 DESCRIPTION
Add a new host entry to dhcpd.conf or remove an existing entry.
Additionally restart DHCP daemon.
=head1 OPTIONS
=over 8
=item B<-d>
Dry run. Do not change files.
=item B<-h>
Print help.
=item B<-n>
Do not restart DHCP daemon.
=item B<-p> PATTERN
Add new entry before line matching PATTERN
=item B<-r> HOST|MAC
Remove entry contain HOST or MAC address.
=back
=head1 EXAMPLES
dhcp-edit host mac
Add entry using host and mac address using a fixed IP address. You
have to define the IP address in /etc/hosts or similar service.
dhcp-edit host mac ip
Add entry using host and mac address using the numerical IP address.
dhcp-edit -r hostname|mac
Remove line containing this hostname or mac address.
=head1 COPYRIGHT
This program is Copyright (C) 2010 by Thomas Lange <lange@informatik.uni-koeln.de>
=cut
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