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#!/usr/bin/perl
# Generate ISC DHCP Configuration File
#
# Reads DHCP Config Data form LDAP Directory and generates an
# include file "dhcp.master.inc" included in dhcpd.conf with:
# - Definitions of User-defined DHCP Options
# - DHCP Service Global Options
# - DHCP Subnet Declarations, Options and Dynamic Pools
# - DHCP Host Declarations and Options
use strict;
use warnings;
#use diagnostics;
use Net::LDAP;
use Net::LDAP::LDIF;
# Configuration Variables for Perl-Script
our ( $ldaphost, $basedn, $userdn, $passwd, $dhcpdn, $dhcpdconfpath, $dhcpdconffile );
# Read Configuration Variables ...
require "dhcpgen.conf.pl";
#use dhcpgenconfig;
my ( $ldap, $mesg, $mesg2 );
# Bind with LDAP Server
$ldap = Net::LDAP->new( $ldaphost ) or die "$@";
$mesg = $ldap->bind( $userdn, password => $passwd );
$mesg->code && die $mesg->error;
mkdir "$dhcpdconfpath/includes";
open DATEI, "> $dhcpdconfpath/includes/dhcp.master.inc";
my @dhcpdnarray = split /,/,$dhcpdn;
my $aurdn = $dhcpdnarray[2];
my @auarray = split /=/,$aurdn;
my $au = $auarray[1];
my $srvrdn = $dhcpdnarray[0];
my @srvarray = split /=/,$srvrdn;
my $srv = $srvarray[1];
# File Header (general Informations)
printf DATEI "##################### DHCP SERVICE CONFIG ############################################ \n#\n";
printf DATEI "# DHCP Service: \t\t %s \n", $srv;
printf DATEI "# Administrative Unit: \t\t %s \n#\n", $au;
printf DATEI "# [ %s ]\n#\n", $dhcpdn;
printf DATEI "######################################################################################## \n\n\n";
# Ldapsearch on DHCP Service Object
$mesg = $ldap->search(base => $dhcpdn,
scope => 'base',
filter => '(objectclass=dhcpService)');
#Net::LDAP::LDIF->new( \*STDOUT,"w" )->write( $mesg->entries );
$mesg->code && die $mesg->error;
my $dhcpservice = $mesg->count or die "DHCP Service Object does not exist in the System";
my $dhcpsrventry = $mesg->entry(0);
printf DATEI "######################\n# Option Definitions\n######################\n\n";
# write Definitions of user/self-defined DHCP Options
if ($dhcpsrventry->exists( 'OptionDefinition' )) {
my @optdefinitions = $dhcpsrventry->get_value( 'OptionDefinition' );
foreach my $optdef ( @optdefinitions) {
printf DATEI "%s\n", $optdef;
}
}
# Failover Information of DHCP Service
my $failoverpeer;
if ($dhcpsrventry->exists( 'dhcpFailoverPeer' )) {
$failoverpeer = $dhcpsrventry->get_value( 'dhcpFailoverPeer' );
}
my $indent = "";
printf DATEI "\n\n######################\n# Global Options\n######################\n\n";
# write DHCP Options in global Scope
dhcpoptions( $dhcpsrventry, $indent );
printf DATEI "\n";
####################################
# DHCP SUBNETS
# ldapsearch on Subnet Objects referencing to DHCP Service Object
$mesg = $ldap->search(base=>$basedn,
scope => 'sub',
filter => '(&(objectclass=dhcpSubnet)(dhcphlpcont:dn:='.$dhcpdn.'))');
#Net::LDAP::LDIF->new( \*STDOUT,"w" )->write( $mesg->entries );
$mesg->code && die $mesg->error;
my @subnets = $mesg->sorted('cn');
# write Subnet Declarations
printf DATEI "\n\n######################\n# DHCP Subnets\n######################\n\n";
foreach my $subnetentry ( @subnets ) {
my $subnetdn = $subnetentry->dn;
my $subnet = $subnetentry->get_value( 'cn' );
my $netmask = $subnetentry->get_value( 'dhcpoptnetmask' );
printf DATEI "subnet %s netmask %s {\n", $subnet, $netmask;
# write DHCP Options in Subnet Scope
my $optindent = " ";
dhcpoptions($subnetentry,$optindent);
# write Pool Declarations in Subnet Declaration
# ldapsearch on Pool Objects referencing to DHCP Subnet Object
$mesg2 = $ldap->search(base=>$basedn,
scope => 'sub',
filter => '(&(objectclass=dhcpPool)(dhcphlpcont:dn:='.$subnetdn.'))');
#Net::LDAP::LDIF->new( \*STDOUT,"w" )->write( $mesg->entries );
$mesg2->code && die $mesg2->error;
my @pools = $mesg2->sorted('cn');
foreach my $poolentry ( @pools ) {
printf DATEI "%spool {\n", $optindent;
# write DHCP Options in Pool Scope
my $poolindent = " ";
if ( $failoverpeer ){
printf DATEI "%sfailover peer \"%s\";\n", $poolindent, $failoverpeer;
printf DATEI "%sdeny dynamic bootp clients;\n", $poolindent;
}
if ($poolentry->exists( 'dhcpRange' )) {
#foreach my $ranges ( @) {
my @range = split /_/,$poolentry->get_value( 'dhcpRange' );
printf DATEI "%srange %s %s;\n", $poolindent, $range[0], $range[1];
}
dhcpoptions($poolentry,$poolindent);
printf DATEI "%s}\n", $optindent;
}
# close Subnet Declaration
printf DATEI "}\n\n";
}
####################################
# DHCP HOSTS
# ldapsearch on DHCP Host Objects referencing to DHCP Service Object
$mesg = $ldap->search(base=>$basedn,
scope => 'sub',
filter => '(&(objectclass=dhcpHost)(dhcphlpcont:dn:='.$dhcpdn.'))');
#Net::LDAP::LDIF->new( \*STDOUT,"w" )->write( $mesg->entries );
$mesg->code && die $mesg->error;
my @hosts = $mesg->sorted('dn');
# write Host Declarations
printf DATEI "\n\n######################\n# DHCP Hosts\n######################\n";
# grouping Hosts by Administrative Units (AU)
my $hostau = "";
foreach my $hostentry ( @hosts ) {
# für jede AU eigener Abschnitt (oder abzweigung in eigene includedatei ...)
my $hostdn = $hostentry->dn();
my @dnarray = split /,/,$hostdn;
my @auarray = split /=/,$dnarray[2];
my $hostauactual = $auarray[1];
if ( $hostau ne $hostauactual) {
# hier neues Datei Handle und neuer Pfad falls eigene includedatei ...
printf DATEI "\n################################################\n# AU: %s \n", $hostauactual;
$hostau = $hostauactual;
}
# DHCP Options in Host Scope
dhcphost($hostentry);
}
close DATEI;
# LDAP unbind
$mesg = $ldap->unbind;
exit (0);
###################################################################################################
# Subroutines
###############
# write DHCP Options, Parameter: DHCP Object LDAP Entry
sub dhcpoptions {
my $entry = shift;
my $indent = shift;
my @atts = $entry->attributes;
# DHCP Optionen mit 'option' vorne dran
my @options1 = grep /dhcpopt/, @atts;
#printf "options: @options1\n";
foreach my $option ( @options1 ){
if ( $option ne "dhcpoptNetmask" ){
my $value = $entry->get_value( $option );
$option =~ s/dhcpopt//;
if ( $option eq "Domain-name"){
printf DATEI "%soption %s \"%s\";\n", $indent, lc($option), $value;
}else{
printf DATEI "%soption %s %s;\n", $indent, lc($option), $value;
}
}
}
# DHCP Optionen
my @options2 = grep /dhcpOpt/, @atts;
#printf "Options: @options2\n";
foreach my $option ( @options2 ){
if ( $option ne "dhcpOptFixed-address" ){
my $value = $entry->get_value( $option );
$option =~ s/dhcpOpt//;
if ( $option eq "Filename"){
printf DATEI "%s%s \"%s\";\n", $indent, lc($option), $value;
}else{
printf DATEI "%s%s %s;\n", $indent, lc($option), $value;
}
}
}
}
# write DHCP Host specific Options, Parameter: DHCP Object LDAP Entry
sub dhcphost {
my $entry = shift;
my @atts = $entry->attributes;
printf DATEI "\nhost %s {\n", lc $entry->get_value( 'hostname' );
# Host specific DHCP Options
if ($entry->exists( 'hwaddress' )) {
printf DATEI " hardware ethernet %s;\n", $entry->get_value( 'hwaddress' );
}
if ($entry->exists( 'dhcpoptfixed-address' )) {
if ( $entry->get_value('dhcpoptfixed-address') eq "ip" ){
my @ip = split /_/, $entry->get_value( 'ipaddress' );
printf DATEI " fixed-address %s;\n", lc $ip[0];
}
if ( $entry->get_value('dhcpoptfixed-address') eq "hostname" ){
printf DATEI " fixed-address %s.%s;\n", lc $entry->get_value( 'hostname' ), lc $entry->get_value( 'domainname' );
}
}
my @hwoptions = grep /Hw-/, @atts;
foreach my $hwoption ( @hwoptions ){
printf DATEI " option %s \"%s\";\n", lc($hwoption), $entry->get_value($hwoption);
}
# remaining DHCP Options
my $optindent = " ";
dhcpoptions ($entry, $optindent);
printf DATEI "}\n";
}
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