#!/usr/bin/perl

# DHCP Conf Parser

# Copyright (C) 2002 MandrakeSoft Arnaud Desmons <adesmons@mandrakesoft.com>
#
# 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, or (at your option)
# any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

package Dhcpconf;
require "__WIZ_HOME__/common/scripts/IFCFG.pm";
#require "__WIZ_HOME__/common/scripts/DrakconnectConf.pm";
use MDK::Common;
use strict;
use standalone;

my $o = IFCFG->new();
my $wiz_ip_server = $o->itf_get("IPADDR");
my $d = "$4" if $wiz_ip_server =~ /(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})/;
my $s = "$1.$2.$3" if $wiz_ip_server =~ /(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})/;

sub	compute_range {
    my $n;
    if ($d <= 64) { $n = "65" }
    elsif ($d <= 128) { $n = "129" }
    else { $n = "1"}
    "$s.$n";
}

sub	compute_range2 {
    my $n;
    if ($d <= 128) { $n = "254" }
    elsif ($d > 192) { $n = "192" }
    else { $n = "128"}
    "$s.$n";
}

sub	check {
# FIXME : see check_range.sh
    my $r1_trunc = "$1.$2.$3" if $ENV{wiz_ip_range1} =~ /(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})/;
    my $r2_trunc = "$1.$2.$3" if $ENV{wiz_ip_range2} =~ /(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})/;
    my $d1 = "$4" if $ENV{wiz_ip_range1} =~ /(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})/;
    my $d2 = "$4" if $ENV{wiz_ip_range2} =~ /(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})/;    
    my $s_trunc = "$1.$2.$3" if $wiz_ip_server =~ /(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})/;
    my $ds = "$4" if $wiz_ip_server =~ /(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})/;
    if (!$r1_trunc) { standalone::explanations("DHCP wizard : incorrect adress range 1"); return 1}
    if (!$r2_trunc) { standalone::explanations("DHCP wizard : incorrect adress range 2"); return 1}
    if ($r1_trunc ne $s_trunc || $r2_trunc ne $s_trunc) { 
	standalone::explanations("DHCP wizard : range not in network");
	return 2;
    }
    if (!$d1 || !$d2 || $d1 > $d2) { standalone::explanations("DHCP wizard : bad range"); return 1}
    if ($ds >= $d1 && $ds <= $d2) { standalone::explanations("DHCP wizard : server in range"); return 3}
    10;
}

sub	check_dhcp {
    $o->is_dhcp() and return 1;
    0;
}

sub	do_it {
    my $wiz_domain_name = $o->network_get("DOMAINNAME"); 
    my $wiz_host_name = $o->network_get("HOSTNAME"); 
    my $wiz_gateway = $o->network_get("GATEWAY"); 
    my $wiz_dns = $o->network_get("dnsServer");
    if ($wiz_dns eq '127.0.0.1') {
    	$wiz_dns = $wiz_ip_server
    }
    if (!$wiz_gateway) {
        my $t = `LC_ALL=C /sbin/ip route list scope global`;
	($wiz_gateway) = $t =~ /default via (\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}) dev/;
    }
    my $wiz_ip_net = "$1.$2.$3.0" if $wiz_ip_server =~ /(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})/;
    my $err = check();
    return $err if $err != 10;
    my $wiz_ip_range1 = $ENV{wiz_ip_range1};
    my $wiz_ip_range2 = $ENV{wiz_ip_range2};
    my $wiz_ip_netmask = $o->itf_get("NETMASK");
    my $wiz_device = $o->default_itf();
# patch to rewrite when got new file about dhcp with INTERFACES value
# currently, I put the device to configure as dhcp server
# in /etc/sysconfig/dhcpd

#[ -f /etc/sysconfig/dhcpd ] && cp -f /etc/sysconfig/dhcpd /var/tmp/wiz_bck/orig/dhcpd
    my $file = "/etc/sysconfig/dhcpd";
    -f $file and MDK::Common::cp_af($file, $file.".orig");

    $file = "/etc/rc.d/init.d/dhcpd";
# now patching etc/rc.d/init.d/dhcpd
    standalone::explanations("now patching etc/rc.d/init.d/dhcpd");
    if (!`grep INTERFACES $file`){
	MDK::Common::append_to_file($file, "\nINTERFACES=$wiz_device");
	MDK::Common::cp_af($file, $file . ".orig");
	my  $tmp = `/bin/mktemp /tmp/Dhcpconf.XXXXXX`	or die "can't make a temp file: $!";
	open(NEW, "> $tmp")				or die "can't open $tmp: $!";
	open(OLD, "< $file")				or die "can't open default: $!";
	while (<OLD>) {
	    if (m|daemon\s*/usr/sbin/dhcp|) {
		print NEW "\tif [ -f /etc/sysconfig/dhcpd ]; then
\t\t. /etc/sysconfig/dhcpd
\t\tDEV=\$INTERFACES
\tfi\n";
	    }
	    print NEW $_;
	}
	close(OLD);
	close(NEW);
	chomp($tmp);
	system("mv $tmp $file");
    }
    $file = "/etc/dhcpd.conf";
    -f $file and MDK::Common::cp_af($file, $file.".orig");
    output($file, map { 
	s|__hname__|$wiz_host_name|g;
	s|__dns__|$wiz_dns|g;
	s|__net__|$wiz_ip_net|g;
	s|__ip__|$wiz_ip_server|g;
	s|__mask__|$wiz_ip_netmask|g;
	s|__rng1__|$wiz_ip_range1|g;
	s|__rng2__|$wiz_ip_range2|g;
	s|__dname__|$wiz_domain_name|g;
	s|__gateway__|$wiz_gateway|g;
	$_;
    } cat_ ("__WIZ_HOME__/dhcp_wizard/scripts/dhcpd.conf.default"));
    standalone::explanations("$file: hname = $wiz_host_name, net = $wiz_ip_net, ip = $wiz_ip_server,
mask = $wiz_ip_netmask, rng1 = $wiz_ip_range1, rng2 = $wiz_ip_range2, dname = $wiz_domain_name");
    MDK::Common::touch("/var/dhcpd/dhcpd.leases");
# modifying webmin config
    $file="/etc/webmin/dhcpd/config";
    if (-f $file) {
	my %mdk = Vareqval->get($file);
	$mdk{lease_file} = "/var/dhcpd/dhcpd.leases";
	$mdk{interfaces} = $wiz_device;
	standalone::explanations("$file: lease_file = $mdk{lease_file}, interfaces = $mdk{interfaces}");
	Vareqval->commit($file, \%mdk);
	!$ENV{wiz_authoritative} and output($file, map { 
	    s|^\s*not\s*authoritative.*|\#$&|i;
	    $_
        } cat_ ("/etc/dhcpd.conf"));
    }

    system("/etc/rc.d/init.d/dhcpd restart");
    10;
}
1;