#!/usr/bin/perl
#
# François Pons <fpons@mandrakesoft.com>
#
# Copyright 2003 MandrakeSoft
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2, as
# published by the Free Software Foundation.
#
# 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.
#


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

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

use common;
use interactive;
use network;
use log;
use c;
use network::netconnect;

$::isInstall and die "Not supported during install.\n";

$::Wizard_pix_up = "wiz_drakgw.png"; #- to change ? keep existing one, nobody will see (too late) ;-)
$::direct = grep { /-direct/ } @ARGV;


#
#my $sysconf_network = "/etc/sysconfig/network";
#my $sysconf_dhcpd = "/etc/sysconfig/dhcpd";
#my $rc_firewall_generic = "/etc/rc.d/rc.firewall";
#my $rc_firewall_drakgw = "/etc/rc.d/rc.firewall.inet_sharing";
#my $rc_firewall_24 = "/etc/rc.d/rc.firewall.inet_sharing-2.4";
#my $masq_file = "/etc/shorewall/masq";
#my $cups_conf = "/etc/cups/cupsd.conf";
#
#my $shorewall = network::shorewall::read();
#
#- get network configuration.
my $netc = {};
my $intf = {};
network::read_all_conf('', $netc, $intf);

my $in = 'interactive'->vnew('su');
$::Wizard_title = N("PXE Server Configuration");

!$::isEmbedded && $in->isa('interactive::gtk') and $::isWizard = 1;

#pur_gtk_mode() if $::isEmbedded && $in->isa('interactive::gtk');

sub sys { system(@_) == 0 or log::l("[drakpxe] Warning, sys failed for $_[0]") }

sub outpend { 
    log::explanations("modified file $_[0]");
    my $f = shift; local *F; open F, ">>$f" or die "outpend in file $f failed: $!\n"; print F foreach @_;
}

sub start_daemons () {
    log::explanations("Starting daemons");

    system("/etc/rc.d/init.d/dhcpd status >/dev/null") == 0 and sys("/etc/rc.d/init.d/dhcpd stop");

    sys("/etc/rc.d/init.d/$_ start >/dev/null"), sys("/sbin/chkconfig --level 345 $_ on") foreach 'httpd', 'dhcpd';
}

sub stop_daemons () {
    log::explanations("Stopping daemons");
    foreach (qw(dhcpd httpd)) {
	system("/etc/rc.d/init.d/$_ status >/dev/null 2>/dev/null") == 0 and sys("/etc/rc.d/init.d/$_ stop");
    }
    sys("/sbin/chkconfig --level 345 $_ off") foreach 'dhcpd', 'httpd';
}

my $wait_configuring;

sub quit_global {
    my ($in, $exitcode) = @_;
    $in->exit($exitcode);
    goto begin
}

sub fatal_quit ($) {
    log::l("[drakpxe] FATAL: $_[0]");
    undef $wait_configuring;
    $in->ask_warn('', $_[0]);
    quit_global($in, -1);
}

#my ($kernel_version) = c::kernel_version() =~ /(...)/;
#log::l("[drakgw] kernel_version $kernel_version");
#
#$kernel_version >= 2.4 or fatal_quit(N("Sorry, we support only 2.4 kernels."));

begin:

#- **********************************
#- * 0th step: verify if we have multiple network interface.

$::Wizard_no_previous = 1;
    
$::direct or $in->ask_okcancel(N("Installation Server Configuration"),
N("You are about to configure your computer to install a PXE server as a DHCP server
and a TFTP server to build an installation server.
With that feature, other computers on your local network will be installable using this computer as source.

Make sure you have configured your Network/Internet access using drakconnect before going any further.

Note: you need a dedicated Network Adapter to set up a Local Area Network (LAN)."), 1) or quit_global($in, 0);

undef $::Wizard_no_previous;


#- **********************************
#- * 1st step: verify if we have multiple network interface.

step_check_intf:

my @intf = grep { exists $_->{NETWORK} } map {
    unless ($_->{NETWORK}) {
	foreach my $s (split "\n", `route`) {
	    print STDERR "$s\n";
	    $s =~ /^(\S+)\s+\S+\s+$_->{NETMASK}\s+.*$_->{DEVICE}/ and $_->{NETWORK} = $1;
	}
    } $_ } values %$intf;
if (@intf < 1) {
    #- no interface already configured found, ask user to configure.
    $in->ask_warn(N("No network adapter on your system!"), 
		  N("No ethernet network adapter has been detected on your system. Please run the hardware configuration tool."));
    quit_global($in, 0);
} elsif (@intf > 1) {
    #- there are more than one interface, we need to choose one of them.
    @intf = $in->ask_from_listf(N("Choose the network interface"),
				 N("Please choose which network interface will be used for the dhcp server."),	
				 sub { N("Interface %s (on network %s)", $_[0]{DEVICE}, $_[0]{NETWORK}) },
				 \@intf,
				) or goto begin;
}


#- **********************************
#- * 3rd step: select installation directory to be used (if not present, next step
#-             will be creation and copy from existing one).

step_ip_range:

#- read current configuration, or create a default suitable automatically.
my $dhcpd_conf = parse_dhcpd_conf("/etc/dhcpd.conf", {}, $netc, $intf[0]);

#- get back default of ip.
my $pool;
foreach (@{$dhcpd_conf->{network}{pool}}) {
    exists $_->{allow}{$dhcpd_conf->{class_PXE}} and $pool = $_, last;
}
my ($start_ip, $end_ip) = @{$pool || { start_ip => join('.', (split '\.', $intf[0]{NETWORK})[0..2], 16),
				       end_ip   => join('.', (split '\.', $intf[0]{NETWORK})[0..2], 253) }}{qw(start_ip end_ip)};

#- it become too complicated to handle address range, so ask user directly.
$in->ask_from('DHCP Server Configuration',
	      N("The DHCP server will allow other computer to boot using PXE in the given range of address.

The network address is %s using a netmask of %s.

", @{$intf[0]}{qw(NETWORK NETMASK)}), [ { label => N("The DHCP start ip"), val => \$start_ip, type => 'entry' },
					{ label => N("The DHCP end ip"), val => \$end_ip, type => 'entry' }, ])
  or goto begin;


#- **********************************
#- * 3rd step: select installation directory to be used (if not present, next step
#-             will be creation and copy from existing one).

step_install_dir:

my $dir = "/export"; #- TODO change according configuration?
    
$in->ask_from('Choose the installation image directory',
	      N("Please indicate where the installation image will be available.

If you do not have an existing directory, please copy the CD or DVD contents.

"),
      [ { label => N("Installation image directory"), val => \$dir, type => 'entry' }, ])
  or goto step_ip_range;

unless (-d $dir && -e "$dir/VERSION" && -d "$dir/isolinux" && -d "$dir/Mandrake/base") {
    $in->ask_warn(N("No image found"), 
		  N("No CD or DVD image found, please copy the installation program and rpm files."));
    goto step_install_dir;
}

#- **********************************
#- * 4st step: ask user for auto installation file.

step_auto_install:

my $auto_inst_cfg = "Mandrake/base/auto_inst.cfg"; #- TODO change according configuration?
-e "$dir/$auto_inst_cfg" or $auto_inst_cfg = '';

$in->ask_from('Choose auto installation',
	      N("Please indicate where the auto_install.cfg file is located.

Leave it blank if you do not want to set up automatic installation mode.

"),
      [ { label => N("Location of auto_install.cfg file"), val => \$auto_inst_cfg, type => 'entry' }, ])
  or goto step_install_dir;

#- now install packages...
my %rpm2file = ('dhcp-server' => '/usr/sbin/dhcpd',
		'pxe' => '/usr/sbin/pxe',
		'tftp-server' => '/usr/sbin/in.tftpd',
		if_(! -x '/usr/sbin/httpd' && ! -x '/usr/sbin/httpd-perl', 'apache2' => '/usr/sbin/httpd2'));

#- first: try to install all in one step
my @needed_to_install = grep { !-e $rpm2file{$_} } keys %rpm2file;
@needed_to_install and $in->do_pkgs->install(@needed_to_install);
#- second: try one by one if failure detected
if (any { !-e $rpm2file{$_} } keys %rpm2file) {
    foreach (keys %rpm2file) {
	-e $rpm2file{$_} or $in->do_pkgs->install($_);
	-e $rpm2file{$_} or fatal_quit(N("Problems installing package %s", $_));
    }
}

#- check if a pool already exist allowing PXE, else create one wich will be correct.
if ($pool) {
    @$pool{qw(start_ip end_ip)} = ($start_ip, $end_ip);
} else {
    $pool = { start_ip => $start_ip, end_ip => $end_ip };
    foreach (keys %{$dhcpd_conf->{class}}) {
	$pool->{$_ eq $dhcpd_conf->{class_PXE} || $_ eq 'Etherboot' ? 'allow' : 'deny'}{$_} = undef;
    }
    push @{$dhcpd_conf->{network}{pool}}, $pool;
}
build_dhcpd_conf($dhcpd_conf, "/etc/dhcpd.conf");

#- make kernel and initrd available for initrd.
mkdir "/var/lib/tftpboot/PXEClient/images";
sys("cp", "-af", "$dir/isolinux/alt0", "/var/lib/tftpboot/PXEClient/images/");

my $pxelinux_cfg = parse_pxelinux_cfg("/var/lib/tftpboot/PXEClient/pxelinux.cfg/default");
my $label;
foreach my $i (0..99) {
    $label = undef;
    foreach my $e (@{$pxelinux_cfg->{entry}}) {
	$e->{label} eq "halt$i" and $label = "halt$i", last;
    }
    defined $label or $label = "halt$i", last;
}
my $server = $intf[0]{IPADDR} || $netc->{HOSTNAME};
push @{$pxelinux_cfg->{entry}}, { label => $label, 
				  kernel => "images/alt0/vmlinuz",
				  append => "initrd=images/alt0/all.rdz ramdisk=32000 vga=788 ".($auto_inst_cfg ? "kickstart=$auto_inst_cfg " : "")."automatic=method:http,network:dhcp,interface:eth0,dns:$netc->{dnsServer},server:$server,directory:$dir root=/dev/ram3" };
build_pxelinux_cfg($pxelinux_cfg, "/var/lib/tftpboot/PXEClient/pxelinux.cfg/default");

#- make directory available for httpd.
log::explanations("Linking $dir in /var/www/html to make it available");
system "mkdir", "-p", "/var/www/html/$dir";
rmdir "/var/www/html/$dir";
symlink $dir, "/var/www/html/$dir";

stop_daemons();
start_daemons();

#- sub for reading/writing dhcpd.conf and pxelinux.cfg/default...
sub parse_dhcpd_conf {
    my ($file, undef, $netc, $intf) = @_;
    my (%dhcpd_conf, $pool);
    local (*F, $_);

    #- fake reading configuration from dhcpd.conf file which is really too complex for this tools.
    $dhcpd_conf{class_PXE} = 'PXE';
    $dhcpd_conf{class} = { PXE => undef, Etherboot => undef, known => undef };
    add2hash($dhcpd_conf{network} = { pool => [] }, $intf);
    add2hash($dhcpd_conf{network}, $netc);

    if (open F, $file) {
	while (<F>) {
	    if (/^\s*pool\s*{/ .. /}/) {
		/^\s*range\s+(\S+)\s+(\S+)\s*;/ and ($pool->{start_ip}, $pool->{end_ip}) = ($1, $2);
		/^\s*(allow|deny)\s+members\s+of\s+"([^"]*)"\s*;/ and $pool->{$1}{$2} = undef;
		/}/ and do { push @{$dhcpd_conf{network}{pool}}, $pool; $pool = undef };
	    }
	}
	close F;
    }

    \%dhcpd_conf;
}

sub build_dhcpd_conf {
    my ($dhcpd_conf, $file) = @_;
    local *F;
    my $server = $dhcpd_conf->{network}{IPADDR} || $dhcpd_conf->{network}{HOSTNAME};
    open F, ">$file" or return;
    log::explanations("Modified file $file");
    print F qq(# for explanation in french go to : http://www.delafond.org/traducmanfr/man/man5/dhcpd.conf.5.html
ddns-update-style none;
allow booting;
allow bootp;

# Your dhcp server is not master on your network !
#not authoritative;
# Your dhcpd server is master on your network !
#authoritative;
not authoritative;

#Interface where dhcpd is active
DHCPD_INTERFACE = "$dhcpd_conf->{network}{DEVICE}";

# Definition of PXE-specific options
# Code 1: Multicast IP address of bootfile
# Code 2: UDP port that client should monitor for MTFTP responses
# Code 3: UDP port that MTFTP servers are using to listen for MTFTP requests
# Code 4: Number of secondes a client must listen for activity before trying
#         to start a new MTFTP transfer
# Code 5: Number of secondes a client must listen before trying to restart
#         a MTFTP transfer

# define Option for the PXE class
option space PXE;
option PXE.mtftp-ip code 1 = ip-address;
option PXE.mtftp-cport code 2 = unsigned integer 16;
option PXE.mtftp-sport code 3 = unsigned integer 16;
option PXE.mtftp-tmout code 4 = unsigned integer 8;
option PXE.mtftp-delay code 5 = unsigned integer 8;
option PXE.discovery-control code 6 = unsigned integer 8;
option PXE.discovery-mcast-addr code 7 = ip-address;

#Define options for pxelinux
option space pxelinux;
option pxelinux.magic      code 208 = string;
option pxelinux.configfile code 209 = text;
option pxelinux.pathprefix code 210 = text;
option pxelinux.reboottime code 211 = unsigned integer 32;
site-option-space "pxelinux";
# These lines should be customized to your setup
#option pxelinux.configfile "configs/common";
#option pxelinux.pathprefix "/pxelinux/files/";
#filename "/pxelinux/pxelinux.bin";
				
option pxelinux.magic f1:00:74:7e;
option pxelinux.reboottime 30;
#if exists dhcp-parameter-request-list {
	# Always send the PXELINUX options
#	append dhcp-parameter-request-list 208, 209, 210, 211;
#	append dhcp-parameter-request-list 208,211;
#					}

#Class that determine the options for Etherboot 5.x requests
class "Etherboot" {

#if The vendor-class-identifier equal Etherboot-5.0
match if substring (option vendor-class-identifier, 0, 9) = "Etherboot";

# filename define the file retrieve by the client, there nbgrub
# our tftp is chrooted so is just the path to the file
filename "/etherboot/nbgrub";

#Used by etherboot to detect a valid pxe dhcp server
option vendor-encapsulated-options 3c:09:45:74:68:65:72:62:6f:6f:74:ff;

# Set the  "vendor-class-identifier" field to "PXEClient" in dhcp answer        
# if this field is not set the pxe client will ignore the answer !
option vendor-class-identifier "Etherboot";

vendor-option-space PXE;
option PXE.mtftp-ip 0.0.0.0;

# IP of you TFTP server
next-server $server;
}


# create the Class PXE
class "PXE" {
# if the "vendor-class-identifier" is set to "PXEClient" in the client dhcp request
match if substring(option vendor-class-identifier, 0, 9) = "PXEClient";
  
# filename define the file retrieve by the client, there pxelinux.0
# our tftp is chrooted so is just the path to the file
# If you prefer use grub, use pxegrub compiled for your ethernet card.
#filename "/PXEClient/pxegrub";
filename "/PXEClient/pxelinux.0";

# Set the  "vendor-class-identifier" field to "PXEClient" in dhcp answer
# if this field is not set the pxe client will ignore the answer !
option vendor-class-identifier "PXEClient";

				  
vendor-option-space PXE;
option PXE.mtftp-ip 0.0.0.0;

# IP of you TFTP server
next-server $server;
}

# the class know exist just for deny the response to other DHCP request
class "known" {
  match hardware;
  one-lease-per-client on;
  ddns-updates on;
  ddns-domainname = "$dhcpd_conf->{network}{DOMAINNAME}";
  option domain-name "$dhcpd_conf->{network}{DOMAINNAME}";
  option domain-name-servers $dhcpd_conf->{network}{dnsServer};
  ddns-hostname = pick-first-value(ddns-hostname, option host-name);
  option fqdn.no-client-update on;
  set vendor_class_identifier = option vendor-class-identifier;
}

# Tags uses by setup_node_mac_to_dhcp
# TAG: NODE_LIST_BEGIN

# TAG: NODE_LIST_END
shared-network "mynetwork" {
  subnet $dhcpd_conf->{network}{NETWORK} netmask $dhcpd_conf->{network}{NETMASK} {
  option subnet-mask $dhcpd_conf->{network}{NETMASK};
  option routers $dhcpd_conf->{network}{GATEWAY};
  default-lease-time 28800;
  max-lease-time 86400;
  option domain-name "$dhcpd_conf->{network}{DOMAINNAME}";
  option domain-name-servers $dhcpd_conf->{network}{dnsServer};
# Used by clusterautosetup-client to find its server
  next-server $server;

);
    foreach (@{$dhcpd_conf->{network}{pool}}) {
	print F "    pool {
       range $_->{start_ip} $_->{end_ip};
";
	print F "       allow members of \"$_\";\n" foreach keys %{$_->{allow}};
	print F "       deny members of \"$_\";\n" foreach keys %{$_->{deny}};
	print F "    }\n";
    }
print F qq(

#   pool {
#     range 192.168.200.200 192.168.200.254;
# give an address of the the pool for PXE client and deny the other
#allow members of "PXE";
#deny members of "known";
#allow members of "Etherboot";
#        }
  }
}
);
    close F;
}

sub parse_pxelinux_cfg {
    my ($file) = @_;
    my (%pxelinux_cfg, $entry);
    local (*F, $_);

    if (open F, $file) {
	while (<F>) {
	    chomp;
	    s/#.*//; next if /^\s*$/;
	    if (/^\s*(PROMPT|DEFAULT|DISPLAY|TIMEOUT)\s+(.*)/i) {
		$pxelinux_cfg{$1} = $2;
	    } elsif (/^\s*label\s+(.*)/i) {
		$entry and push @{$pxelinux_cfg{entry}}, $entry;
		$entry = { label => $1 },
	    } elsif (/^\s*(LOCALBOOT|KERNEL|APPEND)\s+(.*)/i) {
		$entry->{$1} = $2;
	    } else {
		log::l("ignoring line in file $file due to parsing error");
	    }
	}
	$entry and push @{$pxelinux_cfg{entry}}, $entry;
	close F;
    }
    #- try to fix bad file (first version of drakpxe for example).
    my %default_pxelinux_cfg = (PROMPT => 1,
				 DEFAULT => "local",
				 DISPLAY => "messages",
				 TIMEOUT => 50,
				 entry => [ { label => "local",
					      LOCALBOOT => 0 } ],
			       );
    foreach (qw(PROMPT DEFAULT DISPLAY TIMEOUT entry)) {
	length $pxelinux_cfg{$_} > 0 or $pxelinux_cfg{$_} = $default_pxelinux_cfg{$_};
    }
    \%pxelinux_cfg;
}

sub build_pxelinux_cfg {
    my ($pxelinux_cfg, $file) = @_;
    local *F;
    open F, ">$file" or return;
    log::explanations("Modified file $file");
    foreach (keys %$pxelinux_cfg) {
	/^entry$/ and next;
	print F "$_ $pxelinux_cfg->{$_}\n";
    }
    foreach my $e (@{$pxelinux_cfg->{entry}}) {
	print F "label $e->{label}\n";
	foreach (keys %$e) {
	    /^label$/ and next;
	    print F "      $_ $e->{$_}\n";
	}
    }
    close F;
}