#!/usr/bin/perl 
#
# Copyright (C) 2002 by MandrakeSoft (sbenedict@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.
#
# first pass at an interactive tool to help setup/maintain the Mandrake 
# Terminal Server implementation
#
#	Requires: etherboot, mkinitrd-net, terminal-server, dhcpd-server
#			clusternfs, tftpserver
#
#	Tasks:
#		1) creation/management of boot images (kernel+initrd, etherboot enabled)
#			mkinitrd-net is the command line interface for this
#		2) create/modify /etc/dhcpd.conf for diskless clients
#		3) create/modify /etc/exports for clusternfs export of "/"
#		4) add/remove entries in /etc/shadow$$CLIENTS$$ to allow user access
#		5) per client XF86Config-4, using /etc/XF86Config-4$$IP-ADDRESS$$
#		6) other per client customizations (modules.conf, keyboard, mouse)
#		7) enable/modify /etc/xinetd.d/tftp for etherboot
#		8) create etherboot floppies for client machines
#
#	Thanks to the fine work of the folks involved in ltsp.org, and 
#	Michael Brown <mbrown@fensystems.co.uk>
#

use Gtk;
use lib qw(/usr/lib/libDrakX );

use standalone;     #- warning, standalone must be loaded very first, for 'explanations'

use interactive;
use my_gtk qw(:helpers :wrappers);
use common;
use run_program;


use Config;
use POSIX;

my $in = 'interactive'->vnew('su');

my @buff;	#- used o display status info

my $central_widget;
my $window1;
my $windows;
my $status_box;
my $main_box;

my $nfs_subnet;
my $nfs_mask;

my $in = 'interactive'->vnew;

if ("@ARGV" =~ /--help|-h/) {
    print q(Mandrake Terminal Server Configurator
--enable         : enable MTS
--disable        : disable MTS
--start          : start MTS
--stop           : stop MTS
--adduser        : add an existing system user to MTS (requires username)
--deluser        : delete an existing system user from MTS (requires username)
--addclient      : add a client machine to MTS (requires MAC address, IP, nbi image name)
--delclient      : delete a client machine from MTS (requires MAC address, IP, nbi image name)
);
    exit(0);
}

#- make sure terminal server and friends are installed
my $ts = system("rpm -qa | grep terminal-server > /dev/null");
if ($ts == 256) { 
	if ($ENV{'DISPLAY'}) {
		system("urpmi --X terminal-server > /dev/null");
	} else {
		system("urpmi terminal-server > /dev/null");
	}
	$ts = system("rpm -qa | grep terminal-server > /dev/null");
	if ($ts eq 256) {
		warn("Useless without Terminal Server");
		exit(1);
	}
}

if ("@ARGV" =~ /--enable/) {
	my $cmd_line = 1;
	enable_ts($cmd_line);
	exit(0);	
}

if ("@ARGV" =~ /--disable/) {
	my $cmd_line = 1;
	disable_ts($cmd_line);
	exit(0);	
}

if ("@ARGV" =~ /--start/) {
	my $cmd_line = 1;
	start_ts($cmd_line);
	exit(0);	
}

if ("@ARGV" =~ /--stop/) {
	my $cmd_line = 1;
	stop_ts($cmd_line);
	exit(0);	
}

if ("@ARGV" =~ /--adduser/) {
	die "$0 $ARGV[0] requires a username...\n" if $#ARGV<1;
	my $cmd_line = 1;
	adduser($cmd_line, $ARGV[1]);
	exit(0);	
}

if ("@ARGV" =~ /--deluser/) {
	die "$0 $ARGV[0] requires a username...\n" if $#ARGV<1;
	my $cmd_line = 1;
	deluser($cmd_line, $ARGV[1]);
	exit(0);	
}

if ("@ARGV" =~ /--addclient/) {
	die "$0 $ARGV[0] requires hostname, MAC address, IP, nbi-image...\n" if $#ARGV<4;
	my $cmd_line = 1;
	addclient($cmd_line, $ARGV[1], $ARGV[2], $ARGV[3], $ARGV[4]);
	exit(0);	
}

if ("@ARGV" =~ /--delclient/) {
	die "$0 $ARGV[0] requires hostname...\n" if $#ARGV<1;
	my $cmd_line = 1;
	delclient($cmd_line, $ARGV[1], $ARGV[2], $ARGV[3]);
	exit(0);	
}
	
interactive_mode() if $#ARGV<1;

sub cursor_wait {
	# turn the cursor to a watch
	$window1->window->set_cursor(new Gtk::Gdk::Cursor(150));	
	Gtk->main_iteration while Gtk->events_pending;
}

sub cursor_norm {
	# restore normal cursor
	$window1->window->set_cursor(new Gtk::Gdk::Cursor(68));
	Gtk->main_iteration while Gtk->events_pending;
}

sub display_error {
    my ($message) = @_;
    my $label;
    my $error_box;
    ${$central_widget}->destroy();
    gtkpack($status_box,
	    $error_box = gtkpack_(new Gtk::VBox(0,0),
		  1, new Gtk::Label($message),
				  0, gtkadd(gtkset_layout(new Gtk::HButtonBox, -spread),
					    gtksignal_connect(new Gtk::Button(_("OK")), clicked => 
							      sub { ${$central_widget}->destroy(); create_fontsel() }),
					    ),
				  )
	    );
    $central_widget = \$error_box;
}

sub interactive_mode {
    my $font_sel;
#    $interactive = 1;
    init Gtk;
    $window1 = $::isEmbedded ? new Gtk::Plug ($::XID) : new Gtk::Window -toplevel;
    $window1->signal_connect (delete_event => sub { Gtk->exit(0) });
    $window1->set_position(1);
    $window1->set_title(_("Mandrake Terminal Server Configuration"));
    $window1->set_border_width(5);
    my ($pix_user_map, $pix_user_mask) = gtkcreate_png("ic82-network-40");    
    my ($pix_u_map, $pix_u_mask) = gtkcreate_png("drakTS.620x57");

    gtkadd($window1,
	   gtkpack_(new Gtk::VBox(0,2),
		    if_(!$::isEmbedded, 0,  new Gtk::Pixmap($pix_u_map, $pix_u_mask)),
		    1, gtkpack_(new Gtk::HBox(0,2),
			     1, gtkpack_(new Gtk::VBox(0,2),
					1, gtkpack ($status_box = new Gtk::VBox(0,5),
						$main_box = new Gtk::VBox(0,10),
					),
					1, gtkpack_(new Gtk::HBox(0,2),
						     0, gtkadd(gtkset_layout(new Gtk::VButtonBox, -end),
							       gtksignal_connect(new Gtk::Button(_("Enable Server")), clicked 	=>
									 sub { ${$central_widget}->destroy(); 
									 	$windows = 1;
									 	cursor_wait(); 
									 	enable_ts();
									 	cursor_norm();
									 }),
							       gtksignal_connect(new Gtk::Button(_("Disable Server")), clicked => 
									 sub { ${$central_widget}->destroy(); 
									 	cursor_wait();
									 	disable_ts();
									 	cursor_norm(); 
									 }),
							      ),
						     0, gtkadd(gtkset_layout(new Gtk::VButtonBox, -end),
							       gtksignal_connect(new Gtk::Button(_("Start Server")), clicked =>
								sub {  ${$central_widget}->destroy(); 
									$windows = 0; 
									cursor_wait();	
									start_ts();
									cursor_norm();
								}),
							       gtksignal_connect(new Gtk::Button(_("Stop Server")), clicked 	=>
								 sub { ${$central_widget}->destroy(); 
								 	cursor_wait();
								 	stop_ts();
								 	cursor_norm();
								 }),
							      ),
							 0, gtkadd(gtkset_layout(new Gtk::VButtonBox, -end),
							       gtksignal_connect(new Gtk::Button(_("Etherboot Floppy/ISO")), clicked 	=>
									 sub { ${$central_widget}->destroy(); $windows = 1; make_boot() }),
							       gtksignal_connect(new Gtk::Button(_("Net Boot Images")), clicked => 
									 sub { ${$central_widget}->destroy(); make_nbi() }),
							      ),
						     0, gtkadd(gtkset_layout(new Gtk::VButtonBox, -end),
							       gtksignal_connect(new Gtk::Button(_("Add/Del Users")), clicked =>
								 sub {  ${$central_widget}->destroy(); $windows = 0; maintain_users() }),
							       gtksignal_connect(new Gtk::Button(_("Add/Del Clients")), clicked 	=>
								 sub { ${$central_widget}->destroy(); maintain_clients()}),
							      ),     
						     1, new Gtk::HBox(0,2),
						     0, gtkadd(gtkset_layout(new Gtk::VButtonBox, -end),
							       gtksignal_connect(new Gtk::Button(_("Help")),clicked =>
										 sub { ${$central_widget}->destroy(); help() }),
							       gtksignal_connect(new Gtk::Button(_("Close")), clicked => sub {
										     $::isEmbedded and kill 'USR1', $::CCPID;
										     Gtk->main_quit() }),
							      ),
						    ),
					),
			     ),
		    ),
	   );
    $central_widget = \$main_box;
    $window1->show_all;
    $window1->realize;
    $window1->show_all();    

    Gtk->main_iteration while Gtk->events_pending;
    $::isEmbedded and kill 'USR2', $::CCPID;
    Gtk->main;
    Gtk->exit(0);
}

sub about {
    my $text = new Gtk::Text(undef, undef);
    my $about_box;
    gtkpack($status_box,
	    $about_box = gtkpack_(new Gtk::VBox(0,10),
	       1, gtkpack_(new Gtk::HBox(0,0),
			   1, gtktext_insert(gtkset_editable($text, 1), "
 Copyright (C) 2002 by MandrakeSoft 
	Stew Benedict sbenedict\@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.

 Thanks:
	- LTSP Project http://www.ltsp.org
	- Michael Brown <mbrown\@fensystems.co.uk>

"),
			   0, new Gtk::VScrollbar($text->vadj),
			   ),
				  0, gtkadd(gtkset_layout(new Gtk::HButtonBox, -spread),
					    gtksignal_connect(new Gtk::Button(_("OK")), clicked => 
							      sub { ${$central_widget}->destroy(); create_fontsel() }),
					    ),
				  )
	    );
    $central_widget = \$about_box;
    $status_box->show_all();
}

sub help {
    my $text = new Gtk::Text(undef, undef);
    my $help_box;
    gtkpack($status_box,
	    $help_box = gtkpack_(new Gtk::VBox(0,10),
	       1, gtkpack_(new Gtk::HBox(0,0),
			   1, gtktext_insert(gtkset_editable($text, 1), "drakTermServ Overview
			   
        - Create Etherboot Enabled Boot Images:
        		To boot a kernel via etherboot, a special kernel/initrdrd image must be created.
        		mkinitrd-net does much of this work and drakTermServ is just a graphical interface
        		to help manage/customize these images.

        - Maintain /etc/dhcpd.conf:
        		To net boot clients, each client needs a dhcpd.conf entry, assigning an IP address
        		and net boot images to the machine. drakTermServ helps create/remove these entries.
			
        		(PCI cards may omit the image - etherboot will request the correct image. You should
        		also consider that when etherboot looks for the images, it expects names like
        		boot-3c59x.nbi, rather than boot-3c59x.2.4.19-16mdk.nbi).
			 
        		A typical dhcpd.conf stanza to support a diskless client looks like:
        		
				host curly {
					hardware ethernet        00:20:af:2f:f7:9d;
					fixed-address              192.168.192.3;
					filename                      \"i386/boot/boot-3c509.2.4.18-6mdk.nbi\";
				}
			
			While you can use a pool of IP addresses, rather than setup a specific entry for
			a client machine, using a fixed address scheme facilitates using the functionality
			of client-specific configuration files that ClusterNFS provides.
			
			Note: You must stop/start the server after adding or changing clients/
			
        - Maintain /etc/exports:
        		Clusternfs allows export of the root filesystem to diskless clients. drakTermServ
        		sets up the correct entry to allow anonymous access to the root filesystem from
        		diskless clients.

        		A typical exports entry for clusternfs is:
        		
        		/                  (ro,all_squash)
        		/home              SUBNET/MASK(rw,root_squash)
			
			With SUBNET/MASK being defined for your network.
        		
        - Maintain /etc/shadow\$\$CLIENT\$\$:
        		For users to be able to log into the system from a diskless client, their entry in
        		/etc/shadow needs to be duplicated in /etc/shadow\$\$CLIENTS\$\$. drakTermServ helps
        		in this respect by adding or removing system users from this file.

        - Per client /etc/X11XF86Config-4\$\$IP-ADDRESS\$\$:
        		Through clusternfs, each diskless client can have it's own unique configuration files
        		on the root filesystem of the server. In the future drakTermServ will help create these
        		files.

        - Per client system configuration files:
        		Through clusternfs, each diskless client cand have it's own unique configuration files
        		on the root filesystem of the server. In the future, drakTermServ can help create files
        		such as /etc/modules.conf, /etc/sysconfig/mouse, /etc/sysconfig/keyboard on a per-client
        		basis.

        - /etc/xinetd.d/tftp:
        		drakTermServ will configure this file to work in conjunction with the images created by
        		mkinitrd-net, and the entries in /etc/dhcpd.conf, to serve up the boot image to each
        		diskless client.

        		A typical tftp configuration file looks like:
        		
        		service tftp
        		(
                        disable         = no
                        socket_type  = dgram
                        protocol        = udp
                        wait             = yes
                        user             = root
                        server          = /usr/sbin/in.tftpd
                        server_args  = -s /var/lib/tftpboot
        		}
        		
        		The changes here from the default installation are changing the disable flag to
        		'no' and changing the directory path to /var/lib/tftpboot, where mkinitrd-net
        		puts it's images.

        - Create etherboot floppies/CDs:
        		The diskless client machines need either ROM images on the NIC, or a boot floppy
        		or CD to initate the boot sequence.  drakTermServ will help generate these images,
        		based on the NIC in the client machine.
        		
        		A basic example of creating a boot floppy for a 3Com 3c509 manually:
        		
        		cat /usr/lib/etherboot/boot1a.bin /\
        			/usr/lib/etherboot/lzrom/3c509.lzrom > /dev/fd0
 

"),
			   0, new Gtk::VScrollbar($text->vadj),
			   ),
				 0, gtkadd(gtkset_layout(new Gtk::HButtonBox, -spread),
					   gtksignal_connect(new Gtk::Button(_("OK")), clicked => 
							     sub { ${$central_widget}->destroy() }),
					   ),
				 )
	    );
    $central_widget = \$help_box;
    $status_box->show_all();
}

sub make_boot {
	#- make a boot image on floppy or iso from etherboot images
	my $boot_box;
	my $rom_path = "/usr/lib/etherboot";
	my @nics = all("/usr/lib/etherboot/lzrom");
	my $list_nics = new Gtk::List();
	my $nic;
	
	foreach (@nics) {
		my $t = $_;
		$list_nics->add(gtkshow(gtksignal_connect(new Gtk::ListItem($t), 
		select => sub { $nic = $t })));
	}
	$list_nics->set_selection_mode('single');
    
	gtkpack($status_box,
		$boot_box = gtkpack_(new Gtk::VBox(0,10),
			0, gtkadd(new Gtk::HBox(0,10),
				new Gtk::HBox(0,5),
				createScrolledWindow($list_nics),
				gtkadd(new Gtk::VBox(1,10),
					new Gtk::HBox(0,20),
					gtksignal_connect(new Gtk::Button(_("Boot Floppy")), clicked => 
						sub { write_eb_image($nic, $rom_path, "floppy") }),
					gtksignal_connect(new Gtk::Button(_("Boot ISO")), clicked => 
						sub { write_eb_image($nic, $rom_path, "iso") }),
					new Gtk::HBox(0,20),
				),
				new Gtk::HBox(0,5),
			),
		),
	);
	
	$central_widget = \$boot_box;
	$boot_box->show_all();
}

sub make_nbi {
	my $nbi_box;
	my @kernels = grep(/vmlinuz/, all("/boot"));
	my $kernel;
	my $nic;
	
	#- just a static list for the moment
	#- method in mknbi-net is much better
	my @nics = ("3c509", "3c59x", "3c90x", "8139cp", "8139too", "acenic", "airo",
		"aironet4500_card","bcm5700", "dgrs", "dl2k", "dmfe", "e100",
		"e1000", "eepro100", "epic100", "fealnx", "hamachi", "hp100",
		"hysdn", "natsemi", "natsemi_old", "ne", "ne2k-pci", "ns83820",
		"pcnet32", "prism2_pci", "prism2_plx", "rcpci", "sis900",
		"starfire", "sundance", "sungem", "sunhme", "tlan", "tulip-old",
		"via-rhine", "winbond-840", "xircom_cb", "xircom_tulip_cb", "yellowfin");
	
	#- kernel/module info in tree view
	my $tree_kernels = new Gtk::Tree();
	
	foreach (@kernels){
		my $t = $_;
		my $t_kernel = new_with_label Gtk::TreeItem($t);
		gtksignal_connect($t_kernel, select => sub { $kernel = $t;
								$nic = '' });
		$tree_kernels->append($t_kernel);
		
		my $k_detail = new Gtk::Tree();
		$t_kernel->set_subtree($k_detail);
		
		foreach (@nics) {
			my $m = $_;
			my $k_det_nic = new_with_label Gtk::TreeItem($m);
			gtksignal_connect($k_det_nic, select => sub { $nic = $m;
								$kernel = $t });
			$k_detail->append($k_det_nic);
			$k_det_nic->show();
		}		
	}	

	# existing nbi images in list
	my $list_nbis = new Gtk::List();
	my @nbis = grep(/\.nbi/, all("/var/lib/tftpboot"));
	my $nbi;
	
	foreach (@nbis) {
		my $t = $_;
		$list_nbis->add(gtkshow(gtksignal_connect(new Gtk::ListItem($t), 
				select => sub { $nbi = $t })));
	}
	$list_nbis->set_selection_mode('single');		
				
	gtkpack($status_box,
		$nbi_box = gtkpack_(new Gtk::VBox(1,10),
			0, gtkadd(new Gtk::HBox(0,10),
				createScrolledWindow($tree_kernels),
				gtkadd(new Gtk::VBox(1,10),
					gtksignal_connect(new Gtk::Button(_("Build Whole Kernel -->")), clicked => 
						sub { if ($kernel) { 
								$in->ask_warn('',_("This will take a few minutes."));
								cursor_wait();
								system("/usr/bin/mknbi-set -k /boot/$kernel");
								$list_nbis->clear_items();
								@nbis = grep(/\.nbi/, all("/var/lib/tftpboot"));
								foreach (@nbis) {
									my $t = $_;
									$list_nbis->add(gtkshow(gtksignal_connect(new Gtk::ListItem($t), 
									select => sub { $nbi = $t })));
								}
								cursor_norm(); 
							} else {
								$in->ask_warn('',_("No kernel selected!")) if !($kernel); 
							}
						}),
					gtksignal_connect(new Gtk::Button(_("Build Single NIC -->")), clicked => 
						sub { if ($nic) {
								system("/usr/bin/mknbi-set -k /boot/$kernel -r $nic");
								$list_nbis->clear_items();
								@nbis = grep(/\.nbi/, all("/var/lib/tftpboot"));
								foreach (@nbis) {
									my $t = $_;
									$list_nbis->add(gtkshow(gtksignal_connect(new Gtk::ListItem($t), 
									select => sub { $nbi = $t })));
								} 
							} else {
								$in->ask_warn('',_("No nic selected!"));
							}
						}),
					gtksignal_connect(new Gtk::Button(_("Build All Kernels -->")), clicked => 
						sub { $in->ask_warn('',_("This will take a few minutes."));
							cursor_wait();
							system("/usr/bin/mknbi-set");
							$list_nbis->clear_items();
							@nbis = grep(/\.nbi/, all("/var/lib/tftpboot"));
							foreach (@nbis) {
								my $t = $_;
								$list_nbis->add(gtkshow(gtksignal_connect(new Gtk::ListItem($t), 
								select => sub { $nbi = $t })));
							}
							cursor_norm(); 
						}),
					new Gtk::HBox(1,1),
					gtksignal_connect(new Gtk::Button(_("<-- Delete")), clicked => 
						sub { my $nbi = "/var/lib/tftpboot/" . $nbi;
							my $result = unlink($nbi) || warn("Can't delete $nbi...");
							if ($result eq 1) {
								$list_nbis->remove_items($list_nbis->selection);
							}
						}),
					gtksignal_connect(new Gtk::Button(_("Delete All NBIs")), clicked => 
						sub { cursor_wait(); 
							foreach (grep(/\.nbi/, all("/var/lib/tftpboot"))) {
								my $nbi = "/var/lib/tftpboot/" . $_;
								my $result = unlink($nbi) || warn("Can't delete $nbi...");
								#- wanted to walk through these and delete
								#- but can't figure out how to get the item from
								#- the label :(
							}
							$list_nbis->clear_items();
							cursor_norm();
						}),	
					new Gtk::HBox(1,1),
				),
				createScrolledWindow($list_nbis),
			),),
	);
	
	$central_widget = \$nbi_box;
	$nbi_box->show_all();
}

sub maintain_users {
	#- copy users from /etc/shadow to /etc/shadow$$CLIENT$$ to allow ts login
	my $user_box;
	my @sys_users = cat_("/etc/shadow");
	my @ts_users = cat_("/etc/shadow\$\$CLIENT\$\$");
	
	#- use /homes to filter system daemons
	my @homes = all("/home");
	
	my $list_sys_users = new Gtk::List();
	my $sys_user;
	
	foreach (@sys_users) {		
		my ($s_label, $dummy) = split(/:/, $_, 2);
		if (grep(/$s_label/, @homes)) {
			$list_sys_users->add(gtkshow(gtksignal_connect(new Gtk::ListItem($s_label), 
				select => sub { $sys_user = $s_label })));
		}
	}
	$list_sys_users->set_selection_mode('single');
  
	my $list_ts_users =  new Gtk::List();
	my $ts_user;
	
	foreach (@ts_users) {
		my ($t_label, $dummy) = split(/:/, $_, 2);
		my @system_entry = grep(/$t_label/, @sys_users); 
		$t_label = $t_label . " !!!" if ($_ ne $system_entry[0]);
		$list_ts_users->add(gtkshow(gtksignal_connect(new Gtk::ListItem($t_label), 
		select => sub { $ts_user = $t_label })));
	}
	$list_ts_users->set_selection_mode('single');
	
	gtkpack($status_box,
		$user_box = gtkpack_(new Gtk::VBox(0,10),
			0, gtkadd(new Gtk::Label(_("!!! Indicates the password in the system database is different than\n the one in the Terminal Server database.\nDelete/re-add the user to the Terminal Server to enable login."))),
			0, gtkadd(new Gtk::HBox(0,20),
				createScrolledWindow($list_sys_users),
				gtkadd(new Gtk::VBox(1,10),
					new Gtk::HBox(0,10),
					gtksignal_connect(new Gtk::Button(_("Add User -->")), clicked => 
						sub { my $result = adduser(0, $sys_user);
							if ($result eq 0) { 
								$list_ts_users->add(gtkshow(gtksignal_connect(new Gtk::ListItem($sys_user), 
								select => sub { $ts_user = $sys_user;
								$list_ts_users->show() })));
							}
						}),
					gtksignal_connect(new Gtk::Button(_("<-- Del User")), clicked => 
						sub { deluser(0, $ts_user);
							$list_ts_users->remove_items($list_ts_users->selection);
						}),
					new Gtk::HBox(0,10),
				),
				createScrolledWindow($list_ts_users),
			),),
	);
	
	$central_widget = \$user_box;
	$user_box->show_all();
}

sub maintain_clients {
	#- add client machines to Terminal Server config
	my $client_box;
	my %clients = read_dhcpd_conf();
	my $client;
	
	#- client info in tree view
	my $tree_clients = new Gtk::Tree();
	foreach my $key(keys(%clients)){
		my $t = $key;
		my $t_client = new_with_label Gtk::TreeItem($t);
		gtksignal_connect($t_client, select => sub { $client = $t });
		$tree_clients->append($t_client);
		
		my $c_detail = new Gtk::Tree();
		$t_client->set_subtree($c_detail);
		
		my $c_det_hw = new_with_label Gtk::TreeItem($clients{$key}{hardware});
		$c_detail->append($c_det_hw);
		$c_det_hw->show();

		my $c_det_ip = new_with_label Gtk::TreeItem($clients{$key}{address});
		$c_detail->append($c_det_ip);
		$c_det_ip->show();
		
		if ($clients{$key}{filename} ne '') {
			my $c_det_nbi = new_with_label Gtk::TreeItem($clients{$key}{filename});
			$c_detail->append($c_det_nbi);
			$c_det_nbi->show();
		}		
	}
	$tree_clients->set_selection_mode('single');

	#- entry boxes for client data entry
	my $label_host = new Gtk::Label("Client Name:");
	$label_host->set_justify('left');
	my $entry_host = new Gtk::Entry(20);
	my $label_mac = new Gtk::Label("MAC Address:");
	$label_mac->set_justify('left');
	my $entry_mac = new Gtk::Entry(20);
	my $label_ip = new Gtk::Label("IP Address:");
	$label_ip->set_justify('left');
	my $entry_ip = new Gtk::Entry(20);
	my $label_nbi = new Gtk::Label("Kernel Netboot Image:");
	$label_nbi->set_justify('left');
	my $entry_nbi = new Gtk::Combo();

	my @images = grep(/\.nbi/, all("/var/lib/tftpboot/"));
	my $have_nbis = @images;
	if ($have_nbis ne 0) {
		unshift(@images, "");
		$entry_nbi->set_popdown_strings(@images);
		$entry_nbi->set_value_in_list(1, 0);
	} else {
		$in->ask_warn('',_("No net boot images created!"));		
		make_nbi();
		return 1;
	}
			 
	gtkpack($status_box,
		my $client_box = gtkpack_(new Gtk::VBox(1,10),
			0, gtkadd(new Gtk::HBox(0,10),
				gtkadd(new Gtk::VBox(0,5),
					gtkadd($label_host), gtkadd($entry_host),
					gtkadd($label_mac), gtkadd($entry_mac),
					gtkadd($label_ip), gtkadd($entry_ip),
					gtkadd($label_nbi), gtkadd($entry_nbi),
				),
				gtkadd(new Gtk::VBox(1,10),
					new Gtk::HBox(1,1),
					gtksignal_connect(new Gtk::Button(_("Add Client -->")), clicked => 
						sub { my $hostname = $entry_host->get_text();
							my $mac = $entry_mac->get_text();
							my $ip = $entry_ip->get_text();
							my $nbi = $entry_nbi->entry->get_text(); 
							if ($hostname ne '' && $mac ne '' && $ip ne '') {
	
								my $result = addclient(0, $hostname, $mac, $ip, $nbi);
								
								if ($result eq 0) {
									my $t_client = new_with_label Gtk::TreeItem($hostname);
									gtksignal_connect($t_client, select => sub { $client = $hostname });
									$tree_clients->append($t_client);
		
									my $c_detail = new Gtk::Tree();
									$t_client->set_subtree($c_detail);
		
									my $c_det_hw = new_with_label Gtk::TreeItem($mac);
									$c_detail->append($c_det_hw);
									$c_det_hw->show();
								
									my $c_det_ip = new_with_label Gtk::TreeItem($ip);
									$c_detail->append($c_det_ip);
									$c_det_ip->show();
		
									if ($nbi ne '') {
										my $c_det_nbi = new_with_label Gtk::TreeItem($nbi);
										$c_detail->append($c_det_nbi);
										$c_det_nbi->show();
									}
									$t_client->show();
								}		
							}
						}),
					gtksignal_connect(new Gtk::Button(_("<-- Edit Client")), clicked => 
						sub { $entry_host->set_text($client);
							#FIXME - how to get the tree branches?
							
						}),
					gtksignal_connect(new Gtk::Button(_("Delete Client")), clicked => 
						sub { my $result = delclient(0, $client);
							if ($result eq 0) {
								$tree_clients->remove_items($tree_clients->selection);
							}
						}),
					gtksignal_connect(new Gtk::Button(_("dhcpd Config...")), clicked => 
						sub { ${$central_widget}->destroy(); dhcpd_config() }),
					new Gtk::HBox(1,1),
				),
				createScrolledWindow($tree_clients),
			),),
	);
	
	$central_widget = \$client_box;
	$client_box->show_all();
}

sub dhcpd_config {
	#- do main dhcp server config
	my $dhcpd_box;
	my @ifvalues;
	my @resolve;
	my @nserve;
	my %netconfig;
	my @nservers;
						
	#- entry boxes for data entry
	my $box_subnet = new Gtk::HBox(0,0);
	my $label_subnet = new Gtk::Label(_("Subnet:"));
	$label_subnet->set_justify('right');
	my $entry_subnet = new Gtk::Entry(20);	
	$box_subnet->pack_end($entry_subnet, 0, 0, 10);
	$box_subnet->pack_end($label_subnet, 0, 0, 10);
	
	my $box_netmask = new Gtk::HBox(0,0);
	my $label_netmask = new Gtk::Label(_("Netmask:"));
	$label_netmask->set_justify('left');
	my $entry_netmask = new Gtk::Entry(20);
	$box_netmask->pack_end($entry_netmask, 0, 0, 10);
	$box_netmask->pack_end($label_netmask, 0, 0, 10);
	
	my $box_routers = new Gtk::HBox(0,0);
	my $label_routers = new Gtk::Label(_("Routers:"));
	$label_routers->set_justify('left');
	my $entry_routers = new Gtk::Entry(20);
	$box_routers->pack_end($entry_routers, 0, 0, 10);
	$box_routers->pack_end($label_routers, 0, 0, 10);
	
	my $box_subnet_mask = new Gtk::HBox(0,0);
	my $label_subnet_mask = new Gtk::Label(_("Subnet Mask:"));
	$label_subnet_mask->set_justify('left');
	my $entry_subnet_mask = new Gtk::Entry();
	$box_subnet_mask->pack_end($entry_subnet_mask, 0, 0, 10);
	$box_subnet_mask->pack_end($label_subnet_mask, 0, 0, 10);
	
	my $box_broadcast = new Gtk::HBox(0,0);
	my $label_broadcast = new Gtk::Label(_("Broadcast Address:"));
	$label_broadcast->set_justify('left');
	my $entry_broadcast = new Gtk::Entry(20);
	$box_broadcast->pack_end($entry_broadcast, 0, 0, 10);
	$box_broadcast->pack_end($label_broadcast, 0, 0, 10);
	
	my $box_domain = new Gtk::HBox(0,0);
	my $label_domain = new Gtk::Label(_("Domain Name:"));
	$label_domain->set_justify('left');
	my $entry_domain = new Gtk::Entry(20);
	$box_domain->pack_end($entry_domain, 0, 0, 10);
	$box_domain->pack_end($label_domain, 0, 0, 10);
	
	my $box_name_servers = new Gtk::HBox(0,0);
	my $box_name_servers_entry = new Gtk::VBox(0,0);
	my $label_name_servers = new Gtk::Label(_("Name Servers:"));
	$label_name_servers->set_justify('left');
	my $entry_name_server1 = new Gtk::Entry();
	my $entry_name_server2 = new Gtk::Entry();
	my $entry_name_server3 = new Gtk::Entry();
	$box_name_servers_entry->pack_start($entry_name_server1, 0, 0, 0);
	$box_name_servers_entry->pack_start($entry_name_server2, 0, 0, 0);
	$box_name_servers_entry->pack_start($entry_name_server3, 0, 0, 0);
	$box_name_servers->pack_end($box_name_servers_entry, 0, 0, 10);
	$box_name_servers->pack_end($label_name_servers, 0, 0, 10);

	my $label_ip_range_start = new Gtk::Label(_("IP Range Start:"));
	my $label_ip_range_end = new Gtk::Label(_("IP Range End:"));
	my $entry_ip_range_start = new Gtk::Entry(15);
	my $entry_ip_range_end = new Gtk::Entry(15);
	
	#- grab some default entries from the running system
	
	if (-e "/etc/sysconfig/network") {
		%netconfig = getVarsFromSh("/etc/sysconfig/network");
		$entry_domain->set_text($netconfig{DOMAINNAME});
	}
		
	my $sys_netmask = get_mask_from_sys();
	$entry_netmask->set_text($sys_netmask);
	$entry_subnet_mask->set_text($sys_netmask);
	
	my $sys_broadcast = get_broadcast_from_sys();
	$entry_broadcast->set_text($sys_broadcast);
	my $sys_subnet = get_subnet_from_sys($sys_broadcast, $sys_netmask);
		
	$entry_subnet->set_text($sys_subnet);
		
	my @route = grep(/^0.0.0.0/, `/sbin/route -n`);
	@ifvalues = split(/[ \t]+/, $route[0]);
	$entry_routers->set_text($ifvalues[1]);
	
	@resolve = cat_("/etc/resolv.conf");
	my $i = 1;
	chop(@resolve);
	
	foreach (@resolve) {
		@ifvalues = split(/ /, $_);
		if (($ifvalues[0] =~ /nameserver/) && ($i lt 4)){
			$nservers[$i] = $ifvalues[1]; $i++;
		}
	}
	
	$entry_name_server1->set_text($nservers[1]);
	$entry_name_server2->set_text($nservers[2]);
	$entry_name_server3->set_text($nservers[3]);
	
	gtkpack($status_box, 
		$dhcpd_box = gtkpack_(new Gtk::HBox(1,10),
			0, gtkadd((new Gtk::VBox),
				gtkadd($box_subnet),
				gtkadd($box_netmask),
				gtkadd($box_routers),
				gtkadd($box_subnet_mask),
				gtkadd($box_broadcast),
				gtkadd($box_domain),
				gtkadd($box_name_servers),
			),
			0, gtkadd(new Gtk::VBox(0,0),
				new Gtk::Label(_("dhcpd Server Configuration")."\n\n".
					_("Most of these values were extracted\nfrom your running system.\nYou can modify as needed.")),
				
				gtkadd((new Gtk::HBox),
					new Gtk::Label(_("Dynamic IP Address Pool:")),
				),
				gtkadd((new Gtk::HBox(0,0)),
					gtkadd((new Gtk::VBox),
						gtkadd($label_ip_range_start),
						gtkadd($entry_ip_range_start),
					),
					gtkadd((new Gtk::VBox),
						gtkadd($label_ip_range_end),
						gtkadd($entry_ip_range_end),
					),
				),
				gtkadd(new Gtk::HBox),
				gtksignal_connect(new Gtk::Button(_("Write Config")), clicked => 
						sub { write_dhcpd_config(
							$entry_subnet->get_text(),
							$entry_netmask->get_text(),
							$entry_routers->get_text(),
							$entry_subnet_mask->get_text(),
							$entry_broadcast->get_text(),
							$entry_domain->get_text(),
							$entry_name_server1->get_text(),
							$entry_name_server2->get_text(),
							$entry_name_server3->get_text(),
							$entry_ip_range_start->get_text(),
							$entry_ip_range_end->get_text(),						
						) }),
				new Gtk::HBox(0,10),
			),
		),
	);	

	$central_widget = \$dhcpd_box;
	$dhcpd_box->show_all();	
}

sub get_mask_from_sys {
	my %netconfig;
	if (-e "/etc/sysconfig/network-scripts/ifcfg-eth0") {
		%netconfig = getVarsFromSh("/etc/sysconfig/network-scripts/ifcfg-eth0");
		$netconfig{NETMASK};
	}
}

sub get_subnet_from_sys {
	my ($sys_broadcast, $sys_netmask) = @_;
	my @subnet;
	
	my @netmask = split(/\./, $sys_netmask);	
	my @broadcast = split(/\./, $sys_broadcast);
	
	foreach (0..3) {
		#- wasn't evaluating the & as expected
		my $val1 = $broadcast[$_] + 0;
		my $val2 = $netmask[$_] + 0;
		$subnet[$_] = $val1 & $val2;
	}
	
	join(".", @subnet);
}

sub get_broadcast_from_sys {
	my @ifconfig = grep(/inet/, `/sbin/ifconfig eth0`);
	my @ifvalues = split(/[: \t]+/, $ifconfig[0]);
	
	$ifvalues[5];
}

sub write_dhcpd_config {
	my($subnet, $netmask, $routers, $subnet_mask, $broadcast, $domain, $ns1, $ns2, $ns3, $pool_start, $pool_end) = @_;

	$nfs_subnet = $subnet;
	$nfs_mask = $subnet_mask;
	
	open(FHANDLE, "> /etc/dhcpd.conf");
	print FHANDLE "#dhcpd.conf - generated by drakTermServ\n\n";
	print FHANDLE "ddns-update-style none;\n\n";
	print FHANDLE "# Long leases (48 hours)\ndefault-lease-time 172800;\nmax-lease-time 172800;\n\n";
	print FHANDLE "# Include Etherboot definitions and defaults\ninclude \"/etc/dhcpd.conf.etherboot.include\";\n\n";
	print FHANDLE "# Network-specific section\n\n";
	
	print FHANDLE "subnet $subnet netmask $netmask {\n";
	print FHANDLE "\toption routers $routers;\n" if $routers;
	print FHANDLE "\toption subnet-mask $subnet_mask;\n" if $subnet_mask;
	print FHANDLE "\toption broadcast-address $broadcast;\n" if $broadcast;
	print FHANDLE "\toption domain-name \"$domain\";\n" if $domain;
	
	my $pool_string = "\trange dynamic-bootp " . $pool_start . " " . $pool_end . ";\n" if (($pool_start ne '') && ($pool_end ne ''));
	print FHANDLE $pool_string if $pool_string;
	
	my $ns_string = "\toption domain-name-servers " . $ns1 if $ns1;
	$ns_string = $ns_string . ", " . $ns2 if $ns2;
	$ns_string = $ns_string . ", " . $ns3 if $ns3;
	$ns_string = $ns_string . ";\n" if $ns_string;
	print FHANDLE $ns_string if $ns_string;

	print FHANDLE "}\n\n";
	
	print FHANDLE "# Include client machine configurations\ninclude \"/etc/dhcpd.conf.etherboot.clients\";\n";
	close FHANDLE	
}

sub write_eb_image {
	#- write a bootable etherboot CD image or floppy
	my ($nic, $rom_path, $type) = @_;	 	
	if ($type eq 'floppy') {
		my $in = interactive->vnew;
		if (-e "/dev/fd0") {
			my $result = $in->ask_okcancel(_("Please insert floppy disk:"));
			return if !($result);
			$result = system("cat $rom_path/boot1a.bin $rom_path/lzrom/$nic > /dev/fd0") if $result;
			if ($result) {
				$in->ask_warn('',_("Couldn't access the floppy!"))
			} else { 
				$in->ask_warn('',_("Floppy can be removed now"))
			}
		} else {
			$in->ask_warn('',_("No floppy drive available!"));
		}
	} else {
		mkdir_p("/tmp/eb");
		system("cat $rom_path/boot1a.bin $rom_path/lzrom/$nic > /tmp/eb/eb.img");
		system("dd if=/dev/zero of=/tmp/eb/eb.img bs=512 seek=72 count=2808");
		system("mkisofs -b eb.img -o /tmp/$nic.iso /tmp/eb");
		rm_rf("/tmp/eb");
		if (-e "/tmp/$nic.iso") {
			$in->ask_warn('',_("Etherboot ISO image is %s", "/tmp/$nic.iso"))
		} else { 
			$in->ask_warn('',_("Something went wrong! - Is mkisofs installed?"))
		}		
	}
}

sub enable_ts {
	#- setup default config files for terminal server

	my $cmd_line = @_;

	@buff = ();
	$buff[0] = "Enabling Terminal Server...\n\n";
	$buff[1] = "\tChecking default /etc/dhcpd.conf...\n";
	my @my_conf = cat_("/etc/dhcpd.conf");
	if ($my_conf[0] !~ /drakTermServ/) {
		if ($cmd_line eq 1) {
			print("No /etc/dhcpd.conf built yet - use GUI to create!!\n");
			return;
		} else {
			$in->ask_warn('',_("Need to create /etc/dhcpd.conf first!"));
			#$central_widget->destroy;
			dhcpd_config();
			return;		
		}
	}
	my $buff_index = toggle_chkconfig("on", "dhcpd", 2);
	$buff[$buff_index] = "\tSetting up default /etc/exports...\n";
	cp_af("/etc/exports", "/etc/exports.mdkTS") if (-e "/etc/exports");
	open(FHANDLE, "> /etc/exports");
	print FHANDLE "#/etc/exports - generated by drakTermServ\n\n";
	print FHANDLE "/\t(ro,all_squash)\n";
	if ($nfs_subnet eq '') {
		$nfs_subnet = get_subnet_from_sys();
		$nfs_mask = get_mask_from_sys();
		my $sys_broadcast = get_broadcast_from_sys();
		$nfs_subnet = get_subnet_from_sys($sys_broadcast, $nfs_mask);

	}
	print FHANDLE "/home\t$nfs_subnet/$nfs_mask(rw,root_squash)\n";
	close FHANDLE;
	$buff_index = toggle_chkconfig("on", "clusternfs", $buff_index+1);
	$buff_index = toggle_chkconfig("on", "tftp", $buff_index);	
	$buff_index = service_change("xinetd", "restart", $buff_index);
	$buff[$buff_index] = "\n\tDone!";	
	
	if ($cmd_line == 1){
		print "@buff\n";
		return;
	}

    show_status(@buff);
}

sub disable_ts {
	#- restore pre-terminal server configs 
	my $cmd_line = @_;

	@buff = ();
	$buff[0] = "Disabling Terminal Server...\n\n";
	$buff[1] = "\tRestoring original /etc/dhcpd.conf...\n";
	cp_af("/etc/dhcpd.conf.mdkTS", "/etc/dhcpd.conf") if (-e "/etc/dhcpd.conf.mdkTS");
	my $buff_index = toggle_chkconfig("off", "dhcpd", 2);
	$buff[$buff_index] = "\tRestoring default /etc/exports...\n";
	cp_af("/etc/exports.mdkTS", "/etc/exports") if (-e "/etc/exports.mdkTS");
	$buff_index = toggle_chkconfig("off", "clusternfs", $buff_index+1);
	$buff_index = toggle_chkconfig("off", "tftp", $buff_index);
	$buff_index = service_change("xinetd", "restart", $buff_index);
	$buff[$buff_index] = "\n\tDone!";	
	
	if ($cmd_line == 1){
		print "@buff\n";
		return;
	}
	
	show_status(@buff);	
}

sub toggle_chkconfig {
	#- change service config
	my ($state, $service, $buff_index) = @_;
	system("/sbin/chkconfig $service $state");
	$buff[$buff_index] = "\tTurning $service $state...\n";
	$buff_index++;
	$buff_index;
}

sub service_change {
	my ($service, $command, $buff_index) = @_;
	system("BOOTUP=serial /sbin/service $service $command > /tmp/drakTSservice.status 2>&1");
	open(STATUS, "/tmp/drakTSservice.status");
	while(<STATUS>) {
		$buff[$buff_index] = "\t$_";
		$buff_index++;
	}
	close STATUS;
	unlink "/tmp/drakTSservice.status" or warn("Can't delete /tmp/drakTSservice.status\n");
	$buff_index;		
}
	
sub start_ts {
	#- start the terminal server
	my $cmd_line = @_;
	
	@buff = ();
	$buff[0] = "Starting Terminal Server...\n\n";
	my $buff_index = service_change("dhcpd", "start", 2);
	$buff_index = service_change("clusternfs", "start", $buff_index);
	$buff[$buff_index] = "\n\tDone!";	
	
	if ($cmd_line == 1){
		print "@buff\n";
		return;
	}

	show_status(@buff);
}

sub stop_ts {
	#- stop the terminal server
	my $cmd_line = @_;

	@buff = ();
	$buff[0] = "Stopping Terminal Server...\n\n";
	my $buff_index = service_change("dhcpd", "stop", 2);
	$buff_index = service_change("clusternfs", "stop", $buff_index);
	$buff[$buff_index] = "\n\tDone!";	
	
	if ($cmd_line == 1){
		print "@buff\n";
		return;
	}

	show_status(@buff);

}

sub show_status {
	#- just a generic routine to display an array of text in the GUI screen
	my @buff = @_;
	
	my $text = new Gtk::Text(undef, undef);
	my $status_t_box;
	gtkpack($status_box,
	    $status_t_box = gtkpack_(new Gtk::VBox(0,10),
	       1, gtkpack_(new Gtk::HBox(0,0),
			   1, gtktext_insert(gtkset_editable($text, 1), "@buff"),
			),
			),
	);
			   
	$central_widget = \$status_t_box;		   
	$status_box->show_all();	
}

sub adduser {
	my ($cmd_line, $username) = @_;
	my @active_users = cat_("/etc/shadow");
	my @ts_users = cat_("/etc/shadow\$\$CLIENT\$\$");
	my $is_user = grep(/$username/, @active_users);
	my $add_fail = 0;
	my $in_already;
	
	if ($is_user) {
		my @shadow_entry = grep(/$username/, @active_users);
		my $is_ts_user = grep(/$username/, @ts_users);
		if ($is_ts_user) {
			my @ts_shadow = grep(/$username/, @ts_users);
			if ($shadow_entry[0] eq $ts_shadow[0]) {
				$in_already = 1;
			} else {
				#in but password changed
				print "$username passwd bad in Terminal Server - rewriting...\n";
				deluser($cmd_line, $username);				
				adduser($cmd_line, $username);				
			}
		} else {
			# new ts user
			open(FHANDLE, ">> /etc/shadow\$\$CLIENT\$\$");
			print FHANDLE "$shadow_entry[0]" or $add_fail = 1; 
			close FHANDLE;
			$in_already = 0;
		}
	}	
		
	if ($cmd_line == 1){
		print "$username is not a user..\n" if !($is_user);
		print "$username is already a Terminal Server user\n" if $in_already;
		if ($add_fail == 1 || $in_already || !$is_user) {
			print "Addition of $username to Terminal Server failed!\n";
		} else {		
			print "$username added to Terminal Server\n";	
		}
		return;
	} else {
		$in_already;
	}	
}

sub deluser {
	# del a user from the shadow$$CLIENT$$ file
	my ($cmd_line, $username) = @_;
	my $i;
	my $user;
	my $user_deleted;
		
	my @ts_users = cat_("/etc/shadow\$\$CLIENT\$\$");
	my $is_ts_user = grep(/$username/, @ts_users);
	
	if ($is_ts_user) {
		$i = 0;
		foreach $user (@ts_users) {
			if ($user =~ /$username/) {
				splice (@ts_users, $i, 1);
				$user_deleted = 1;
				last;
			}
			$i++;
		}			
		open(FHANDLE, "> /etc/shadow\$\$CLIENT\$\$");
		foreach $user (@ts_users) {
			print FHANDLE "$user";
		} 
		close FHANDLE;
	}
	
	if ($cmd_line == 1){
		if ($user_deleted) {
			print "Deleted $username...\n";
		} else {
			print "$username not found...\n";
		}
		return;
	}	
}

sub addclient {
	#- add a new client entry after checking for dups
	my ($cmd_line, $hostname, $mac, $ip, $nbi) = @_;

	my $host_in_use = 0;
	my $mac_in_use = 0;
	my $ip_in_use = 0;
	my $client;
			
	my %ts_clients = read_dhcpd_conf();

	foreach $client(keys(%ts_clients)){
		$host_in_use = 1 if ($hostname eq $client);
		$mac_in_use = 1 if ($mac eq $ts_clients{$client}{hardware});
		$ip_in_use = 1 if ($ip eq $ts_clients{$client}{address});
	}
	
	if ($cmd_line == 1){
		print "$hostname already in use\n" if $host_in_use;
		print "$mac already in use\n" if $mac_in_use;
		print "$ip already in use\n" if $ip_in_use;
		if ($host_in_use || $mac_in_use || $ip_in_use) {
			return;
		}
	}

	if (!$host_in_use && !$mac_in_use && !$ip_in_use) {
		$ts_clients{$hostname}{hardware} = $mac;
		$ts_clients{$hostname}{address} = $ip;
		$ts_clients{$hostname}{filename} = $nbi;

		my $clients = "/etc/dhcpd.conf.etherboot.clients";
		open(CLIENT, ">> $clients") || warn ("Can't open $clients!");
		my $client_entry = format_client_entry($hostname, %ts_clients);
		print CLIENT $client_entry;
		close CLIENT;	
		0;
	} 
}
	
sub delclient {
	#- find a client and delete the entry in dhcpd.conf
	my ($cmd_line, $hostname) = @_;
	my $client;
	my $host_found;
	
	my %ts_clients = read_dhcpd_conf();
	
	foreach $client(keys(%ts_clients)){
		if ($hostname eq $client) {
			$host_found = 1;
			delete $ts_clients{$client};
			write_dhcpd_conf(%ts_clients);
			return 0;			
		}
	}
		
	if ($cmd_line == 1){
		print "$hostname not found...\n" if (!$host_found);
		return;
	}	
}

sub format_client_entry {
	#- create a client entry, in proper format
	my ($client, %ts_clients) = @_;

	my $entry = "host $client {\n";
	$entry .= "\thardware ethernet\t$ts_clients{$client}{hardware};\n";
	$entry .= "\tfixed-address\t\t$ts_clients{$client}{address};\n";
	$entry .= "\tfilename\t\t\"$ts_clients{$client}{filename}\";\n" if ($ts_clients{$client}{filename} ne '');
	$entry .= "}\n";
	$entry
}

sub write_dhcpd_conf {
	my %ts_clients = @_;
	my $clients = "/etc/dhcpd.conf.etherboot.clients";
	my $key;
		
	open(CLIENT, "> $clients") || warn ("Can't open $clients!");
	foreach $key(keys(%ts_clients)){
		my $client_entry = format_client_entry($key, %ts_clients);
		print CLIENT $client_entry;
	}
	close CLIENT	
}

sub read_dhcpd_conf {
	my $clients = "/etc/dhcpd.conf.etherboot.clients";
	my %ts_clients;
	my $hostname;
	
	#- read and parse current client entries
	open(CLIENTS, $clients) || warn("Can't open $clients\n"); 
	while(<CLIENTS>) {
		my ($name, $val, $val2) = split(' ',$_);
		$val = $val2 if ($name =~ /hardware/);
		$val =~ s/[;"]//g;
		if ($name !~ /}/) {
			if ($name =~ /host/) {
				$hostname = $val;
			} else {
				$name = "address" if ($name =~ /fixed-address/);
				$ts_clients{$hostname}{$name} = $val;
			}
		}	
	}
	close CLIENTS;
	%ts_clients;	
}