<?php
/*
$Id$

  This code is part of LDAP Account Manager (http://www.ldap-account-manager.org/)
  Copyright (C) 2008        Thomas Manninger
                2008 - 2015  Roland Gruber

  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.

  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

*/

/**
* Manages DHCP entries.
*
* @package modules
*
* @author Thomas Manninger
* @author Roland Gruber
*/

/**
 * This function checks if the given IP address ist valid.
 *
 * @param string IP to check
 * @param check Subnet
 * @return boolean true or false
 **/
if (!function_exists('check_ip')) {
	
	/**
	 * Checks if the given IP is valid.
	 * 
	 * @param String $ip IP address
	 * @param boolean $subnet IP must be a subnet
	 */
	function check_ip($ip, $subnet = false) {
		$part = explode(".", $ip);
		// Wenn... Keine 4 Segmente gefunden wurde
		if (count($part) != 4) {
			return false;
		}
		else {
			// check each segment
			for ($i = 0; $i < count($part); $i++) {
				// only numbers are allowed
				if (!is_numeric($part[$i])) {
					return false;
				}
				else {
					// if not check Subnet, than segment must be smaller than 256, else smaller than 255
					if($part[$i] > 255 || ($i==3 && (!$subnet && $part[$i]<1)) || ($i==3 && (!$subnet && $part[$i]<0))) {
						return false;
					}
				}
			}
		}
		return true;
	}
}

/**
* Manages DHCP entries.
*
* @package modules
*/
class dhcp_settings extends baseModule {

	/** all netbios node types */
	private $all_netbios_node_types;
	/** unknown-client options */
	private $allowDenyOptions;
	/** LDAP attributes */
	public $attributes;
	
	/**
	* Creates a new dhcp_settings object.
	*
	* @param string $scope account type
	*/
	function __construct($scope) {
		// list of node types
		$this->all_netbios_node_types = array(
			"1" => _("B-Node (0x01)"),
			"2" => _("P-Node (0x02)"),
			"4" => _("M-Node (0x04)"),
			"8" => _("H-Node (0x08)")
		);
		$this->allowDenyOptions = array(
			'-' => '',
			'allow' => _("Allow"),
			'deny' => _("Deny"),
		);
		// call parent constructor
		parent::__construct($scope);
	}

	/**
	* Returns true if this module can manage accounts of the current type, otherwise false.
	* 
	* @return boolean true if module fits
	*/
	public function can_manage() {
		return in_array($this->get_scope(), array('dhcp'));
	}

	/**
	 * Returns meta data that is interpreted by parent class
	 *
	 * @return array array with meta data
	 */
	public function get_metaData() {
		$return = array();
		// alias name
		$return["alias"] = _("DHCP settings");
		// this is a base module
		$return["is_base"] = true;
		// icon
		$return['icon'] = 'dhcpBig.png';
		// RDN attribute
		$return["RDN"] = array("cn" => "high");
		// LDAP filter
		$return["ldap_filter"] = array();
		// module dependencies
		$return['dependencies'] = array('depends' => array(), 'conflicts' => array());
		// managed object classes
		$return['objectClasses'] = array('top', 'dhcpOptions', 'dhcpSubnet');
		// managed attributes
		$return['attributes'] = array('cn', 'dhcpOption', 'dhcpComments', 'dhcpNetMask', 'dhcpStatements');
		// help Entries
		$return['help'] = array(
			'domainname' => array(
				"Headline" => _("Domain name"),
				"Text" => _("The domain name of the subnet.")
			),
			'subnet' => array(
				"Headline" => _("Subnet"), 'attr' => 'cn',
				"Text" => _("The name of the subnet. Example: 192.168.10.0")
			),
			'leasetime' => array(
				"Headline" => _("Lease time"),
				"Text" => _("The lease time specifies after how many seconds the client should request a new IP address.")
			),
			'max_leasetime' => array(
				"Headline" => _("Maximum lease time"),
				"Text" => _("The maximum lease time specifies after how many seconds the client must request a new IP address.")
			),
			'dns' => array(
				"Headline" => _("DNS (Domain Name System)"),
				"Text" => _("The IP addresses of the DNS servers. Multiple addresses are separated by \",\". Example: 192.168.0.10, 192.168.0.11")
			),
			'gateway' => array(
				"Headline" => _("Default gateway"),
				"Text" => _("Packets are sent to the default gateway if the receiver does not reside in the same network. The default gateway routes them to the target network.")
			),
			'netbios' => array(
				"Headline" => _("Netbios name servers"),
				"Text" => _("The IP addresses of the Netbios name servers (e.g. \"123.123.123.123, 123.123.123.124\").")
			),
			'netbios_type' => array(
				"Headline" => _("Netbios node type"),
				"Text" => _("<b>B-Node (0x01): Broadcast.</b><br/>The client tries to find other workstations via broadcasting
(works only inside the same collision domain, viz. the same subnet).<br/><br/>

<b>P-Node (0x02): Point-To-Point</b><br />
The client contacts a Netbios name server (NBNS) from Microsoft Windows Name Service (WINS) for name resolution.<br/><br/>

<b>M-Node (0x04): Mixed</b><br />
The node tries broadcasting first. If that fails then it tries WINS.<br/><br/>

<b>H-Node (0x08): Hybrid</b><br />
The node tries WINS first. If that fails it tries broadcasting.<br/><br/>

By default, the nodes are configured as H-Nodes which fits for small networks. In large networks Point-to-Point (0x02) should be used.")
			),
			'subnetmask' => array(
				"Headline" => _("Subnet mask"),
				"Text" => _("The subnet mask of the network.")
			),
			'netmask' => array(
				"Headline" => _("Net mask"), 'attr' => 'dhcpNetMask',
				"Text" => _("The net mask is derived from the subnet mask. LAM will calculate it automatically.")
			),
			'description' => array(
				"Headline" => _("Description"), 'attr' => 'dhcpComments',
				"Text" => _("Here you can enter a description for this DHCP entry.")
			),
			'unknownClients' => array(
				"Headline" => _("Unknown clients"), 'attr' => 'dhcpStatements',
				"Text" => _("Specifies if unknown clients are allowed.")
			),
		);
		// available PDF fields
		$return['PDF_fields'] = array(
			'subnet' => _('Subnet'),
			'domainName' => _('Domain name'),
			'leaseTime' => _('Lease time'),
			'maxLeaseTime' => _('Maximum lease time'),
			'DNSserver' => _('DNS'),
			'gateway' => _('Default gateway'),
			'netbiosServer' => _('Netbios name servers'),
			'netbiosType' => _('Netbios node type'),
			'subnetMask' => _('Subnet mask'),
			'netMask' => _('Net mask'),
			'description' => _('Description'),
			'unknownClients' => _('Unknown clients'),
		);
		// profile elements
		$profileContainer = new htmlTable();
		$profileContainer->addElement(new htmlTableExtendedInputField(_('Subnet'), 'cn', null, 'subnet'), true);
		$profileContainer->addElement(new htmlTableExtendedInputField(_('Domain name'), 'domainname', null, 'domainname'), true);
		$profileContainer->addElement(new htmlTableExtendedInputField(_('Lease time'), 'lease_time', null, 'leasetime'), true);
		$profileContainer->addElement(new htmlTableExtendedInputField(_('Maximum lease time'), 'max_lease_time', null, 'max_leasetime'), true);
		$profileContainer->addElement(new htmlTableExtendedInputField(_('DNS'), 'dns', null, 'dns'), true);
		$profileContainer->addElement(new htmlTableExtendedInputField(_('Default gateway'), 'routers', null, 'gateway'), true);
		$profileContainer->addElement(new htmlTableExtendedInputField(_('Netbios name servers'), 'netbios', null, 'netbios'), true);
		$nodeList = array_flip($this->all_netbios_node_types);
		$profileNodeSelect = new htmlTableExtendedSelect('netbios_node_type', $nodeList, null, _('Netbios node type'), 'netbios_type');
		$profileNodeSelect->setHasDescriptiveElements(true);
		$profileContainer->addElement($profileNodeSelect, true);
		$profileContainer->addElement(new htmlTableExtendedInputField(_('Subnet mask'), 'subnet', null, 'subnetmask'), true);
		$return['profile_options'] = $profileContainer;
		// upload fields
		$uploadAllowDenyOption = $this->allowDenyOptions;
		unset($uploadAllowDenyOption['-']);
		$uploadAllowDenyOption = implode(', ', $uploadAllowDenyOption);
		$return['upload_columns'] = array(
			array(
				'name' => 'dhcp_settings_subnet',
				'description' => _('Subnet'),
				'help' => 'subnet',
				'example' => '192.168.10.0',
				'required' => true,
				'unique' => 'true'
			),
			array(
				'name' => 'dhcp_settings_domainName',
				'description' => _('Domain name'),
				'help' => 'domainname',
				'example' => 'mydomain.com',
			),
			array(
				'name' => 'dhcp_settings_leaseTime',
				'description' => _('Lease time'),
				'help' => 'leasetime',
				'example' => '86400',
			),
			array(
				'name' => 'dhcp_settings_maxLeaseTime',
				'description' => _('Maximum lease time'),
				'help' => 'max_leasetime',
				'example' => '172800',
			),
			array(
				'name' => 'dhcp_settings_DNSserver',
				'description' => _('DNS'),
				'help' => 'dns',
				'example' => '192.168.10.250',
			),
			array(
				'name' => 'dhcp_settings_gateway',
				'description' => _('Default gateway'),
				'help' => 'gateway',
				'example' => '192.168.10.251',
			),
			array(
				'name' => 'dhcp_settings_netbiosServer',
				'description' => _('Netbios name servers'),
				'help' => 'netbios',
				'example' => '192.168.10.252, 192.168.10.253',
			),
			array(
				'name' => 'dhcp_settings_netbiosType',
				'description' => _('Netbios node type'),
				'help' => 'netbios_type',
				'example' => 'M',
				'default' => 'H',
				'values' => 'B, H, M, P'
			),
			array(
				'name' => 'dhcp_settings_unknownClients',
				'description' => _('Unknown clients'),
				'help' => 'unknownClients',
				'values' => $uploadAllowDenyOption
			),
			array(
				'name' => 'dhcp_settings_subnetMask',
				'description' => _('Subnet mask'),
				'help' => 'subnetmask',
				'required' => true,
				'example' => '255.255.255.0',
			),
			array(
				'name' => 'dhcp_settings_description',
				'description' => _('Description'),
				'help' => 'description',
			),
		);
		return $return;
	}
	
	/**
	* This function fills the message array.
	*/
	public function load_Messages() {
		$this->messages['cn'][0] = array('ERROR', _('No subnet entered.'));
		$this->messages['cn'][1] = array('ERROR', _('The subnet is already in use.'));
		$this->messages['cn'][2] = array('ERROR', _('The subnet is invalid.'));
		$this->messages['cn'][3] = array('ERROR', _('Account %s:') . ' dhcp_settings_subnet', _('The subnet is invalid.'));
		$this->messages['dns'][0] = array('ERROR', _('You entered one or more invalid DNS servers.'));
		$this->messages['dns'][1] = array('ERROR', _('Account %s:') . ' dhcp_settings_DNSserver', _('You entered one or more invalid DNS servers.'));
		$this->messages['lease_time'][0] = array('ERROR', _('The lease time is invalid.'));
		$this->messages['lease_time'][1] = array('ERROR', _('Account %s:') . ' dhcp_settings_leaseTime', _('The lease time is invalid.'));
		$this->messages['routers'][0] = array('ERROR', _('The default gateway is invalid.'));
		$this->messages['routers'][1] = array('ERROR', _('Account %s:') . ' dhcp_settings_gateway', _('The default gateway is invalid.'));
		$this->messages['netbios'][0] = array('ERROR', _('The Netbios server is invalid.'));
		$this->messages['netbios'][1] = array('ERROR', _('Account %s:') . ' dhcp_settings_netbiosServer', _('The Netbios server is invalid.'));
		$this->messages['netbios_node_type'][1] = array('ERROR', _('Account %s:') . ' dhcp_settings_netbiosType', _('The entered Netbios node type does not exist.'));
		$this->messages['unknownClients'][0] = array('ERROR', _('Account %s:') . ' dhcp_settings_unknownClients', _('Please enter a valid option.'));
		$this->messages['max_lease_time'][0] = array('ERROR', _('The maximum lease time is invalid.'));
		$this->messages['max_lease_time'][1] = array('ERROR', _('Account %s:') . ' dhcp_settings_maxLeaseTime', _('The maximum lease time is invalid.'));
		$this->messages['subnet'][0] = array('ERROR', _('The subnet mask is invalid.'));
		$this->messages['subnet'][1] = array('ERROR', _('Account %s:') . ' dhcp_settings_subnetMask', _('The subnet mask is invalid.'));
		$this->messages['ranges_reload'][0] = array('INFO', _('The DHCP ranges were changed to fit for the new subnet.'));
		$this->messages['ips_reload'][0] = array('INFO', 'The fixed IP addresses were changed to fit for the new subnet.');
		$this->messages['domainname'][2] = array('ERROR', _('The domain name includes invalid characters. Valid characters are A-Z, a-z, 0-9, ".", "_","-".'));
		$this->messages['domainname'][5] = array('ERROR', _('Account %s:') . ' dhcp_settings_domainName', _('The domain name includes invalid characters. Valid characters are A-Z, a-z, 0-9, ".", "_","-".'));
	}
	
	/**
	* Returns a list of modifications which have to be made to the LDAP account.
	*
	* @return array list of modifications
	* <br>This function returns an array with 3 entries:
	* <br>array( DN1 ('add' => array($attr), 'remove' => array($attr), 'modify' => array($attr)), DN2 .... )
	* <br>DN is the DN to change. It may be possible to change several DNs (e.g. create a new user and add him to some groups via attribute memberUid)
	* <br>"add" are attributes which have to be added to LDAP entry
	* <br>"remove" are attributes which have to be removed from LDAP entry
	* <br>"modify" are attributes which have to been modified in LDAP entry
	* <br>"info" are values with informational value (e.g. to be used later by pre/postModify actions)
	*/
	public function save_attributes() {
		// remove dhcpSubnet object class if only the DHCP settings were changed
		if ($this->getAccountContainer()->dn_orig == $_SESSION['config']->get_suffix('dhcp')) {
			if (!in_array_ignore_case("dhcpSubnet", $this->orig['objectClass']) && in_array_ignore_case("dhcpSubnet", $this->attributes['objectClass'])) {
				$this->attributes['objectClass'] = array_delete(array("dhcpSubnet"), $this->attributes['objectClass']);
			}
		}
		$return = parent::save_attributes();
		return $return;
	}
	
	/**
	* Processes user input of the primary module page.
	* It checks if all input values are correct and updates the associated LDAP attributes.
	*
	* @return array list of info/error messages
	*/
	public function process_attributes() {
		// check if DHCP main settings and valid DHCP entry
		if ($_SESSION['config']->get_suffix('dhcp') == $this->getAccountContainer()->dn_orig) {
			if (!in_array_ignore_case('dhcpService', $this->attributes['objectClass']) && !in_array_ignore_case('dhcpServer', $this->attributes['objectClass'])) {
				return array();
			}
		}
		$errors = array();

		// Check if cn is not empty
		if ($_SESSION['config']->get_suffix('dhcp') != $this->getAccountContainer()->dn_orig) {
			if (!empty($_POST['cn'])) $_POST['cn'] = trim($_POST['cn']);
			$this->attributes['cn'][0] = $_POST['cn'];
			if (empty($_POST['cn'])) {
			    $errors[] = $this->messages['cn'][0];
			}
			// Check, if cn is not already use:
		    elseif ((sizeof(searchLDAPByAttribute('cn', $_POST['cn'], 'dhcpOptions', array('cn'), array('dhcp'))) > 0) && $this->orig['cn']['0']!=$_POST['cn']) {
		       	$errors[] = $this->messages['cn'][1];
		    }
			elseif (!check_ip($_POST['cn'],true)) {
				$errors[] = $this->messages['cn'][2];
			}
			elseif (strrpos($_POST['cn'], '.0') != (strlen($_POST['cn']) - 2)) {
				$errors[] = $this->messages['cn'][2];
			}
			else {
				// if the cn was edit, reload the Ranges:
	            if ($this->getAccountContainer()->getAccountModule('range')->reload_ranges())
	            	$errors[] = $this->messages['ranges_reload'][0];
		            // if the cn was edit, reload the ips:
	            if ($this->getAccountContainer()->getAccountModule('fixed_ip')->reload_ips())
	            	$errors[] = $this->messages['ips_reload'][0];
			}
			$this->setUnknownClients($_POST['unknownClients']);
		}
		
		// Check domainname:
		if (!empty($_POST['domainname'])) $_POST['domainname'] = trim($_POST['domainname']);
		if (!empty($_POST['domainname'])) {
			if (!preg_match("/^[A-Za-z0-9\\._-]*$/", $_POST['domainname'])) {
			    $errors[] = $this->messages['domainname'][2];
			}
		}
		$this->setDHCPOption('domain-name', '"' . $_POST['domainname'] . '"');

		// Check DNS
		if (!empty($_POST['dns'])) {
			$_POST['dns'] = trim($_POST['dns']);
			$ex = explode(",", $_POST['dns']);
			$dns = "";
			$is_first=true;
			$invalid = false;
			foreach($ex AS $string) {
				if ($is_first) {
					$dns .= $string;
					$is_first=false;
			    }
				else {
			    	$dns .= ",$string";
				}

	            if (!check_ip($string)) {
			        $invalid = true;
			    }
			}
			if ($invalid) {
			    $errors[] = $this->messages['dns'][0];
			}
		}
		$this->setDHCPOption('domain-name-servers', $_POST['dns']);
		
		// Lease Time
		if (!empty($_POST['lease_time'])) {
			$_POST['lease_time'] = trim($_POST['lease_time']);
		}
		$this->setDefaultLeaseTime($_POST['lease_time']);
		if (!is_numeric($_POST['lease_time']) && !empty($_POST['lease_time'])) {
			$errors[] = $this->messages['lease_time'][0];
		}
		
		// Max lease Time
		if (!empty($_POST['max_lease_time'])) {
			$_POST['max_lease_time'] = trim($_POST['max_lease_time']);
		}
		$this->setMaxLeaseTime($_POST['max_lease_time']);
		if (!is_numeric($_POST['max_lease_time']) && !empty($_POST['max_lease_time'])) {
			$errors[] = $this->messages['max_lease_time'][0];
		}
		
		// Default Gateway
		if (!empty($_POST['routers'])) {
			$_POST['routers'] = trim($_POST['routers']);
			if (!check_ip($_POST['routers'])) {
				$errors[] = $this->messages['routers'][0];
			}
		}
		$this->setDHCPOption('routers', $_POST['routers']);
		
		// Netbios
		if (!empty($_POST['netbios'])) $_POST['netbios'] = trim($_POST['netbios']);
		$netbiosServers = explode(', ', $_POST['netbios']);
		$netbiosServersOk = true;
		for ($i = 0; $i < sizeof($netbiosServers); $i++) {
			if (!check_ip($netbiosServers[$i]) && !get_preg($netbiosServers[$i], 'DNSname')) {
				$netbiosServersOk = false;
				break;
			}
		}
		if (!$netbiosServersOk && !empty($_POST['netbios'])) {
			$errors[] = $this->messages['netbios'][0];
		}
		$this->setDHCPOption('netbios-name-servers', $_POST['netbios']);
		
		$this->setDHCPOption('netbios-node-type', $_POST['netbios_node_type']);
		
		if ($this->getAccountContainer()->dn_orig!=$_SESSION['config']->get_suffix('dhcp')) {
			// Check subnet
			$_POST['subnet'] = trim($_POST['subnet']);
			if (!$this->checkSubnetMask($_POST['subnet'])) {
			    $errors[] = $this->messages['subnet'][0];
			}
			$this->setDHCPOption('subnet-mask', $_POST['subnet']);

			// calculate netmask from subnet:
			if (!empty($_POST['subnet'])) {
				$this->attributes['dhcpNetMask'][0] = $this->calculateNetMask($_POST['subnet']);
			}
		}
		$this->attributes['dhcpComments'][0] = $_POST['description'];
		
		return $errors;
	}
	
	/**
	 * Checks if the subnet mask is valid.
	 *
	 * @param String $mask subnet mask
	 * @return boolean correct or incorrect
	 */
	private function checkSubnetMask($mask) {
		// check basic format
		if (!check_ip($mask, true)) {
			return false;
		}
		// check if bit order is 11...00...
		$parts = explode('.', $mask);
		$bits = '';
		for ($i = 0; $i < sizeof($parts); $i++) {
			$bits .= decbin($parts[$i]);
		}
		return preg_match('/^1*0*$/', $bits);
	}
	
	/**
	 * Calculates the net mask from the subnet.
	 *
	 * @param String $subnet subnet
	 * @return integer netmask
	 */
	private function calculateNetMask($subnet) {
		$ex = explode(".", $subnet);
		$num = 0;
		foreach($ex AS $mask) {
		    $binary = decbin($mask);
		    $num += substr_count($binary, 1);
		}
		return $num;
	}
	
	/**
	 * Returns the HTML meta data for the main account page.
	 * 
	 * @return htmlElement HTML meta data
	 */
	public function display_html_attributes() {
		$return = new htmlTable();
		// check if DHCP main settings and valid DHCP entry
		if ($_SESSION['config']->get_suffix('dhcp') == $this->getAccountContainer()->dn_orig) {
			if (!in_array_ignore_case('dhcpService', $this->attributes['objectClass']) && !in_array_ignore_case('dhcpServer', $this->attributes['objectClass'])) {
				$return->addElement(new htmlStatusMessage('ERROR', _('Please set your LDAP suffix to an LDAP entry with object class "dhcpService" or "dhcpServer".')));
				return $return;
			}
		}
		// Subnet name
		if ($_SESSION['config']->get_suffix('dhcp') != $this->getAccountContainer()->dn_orig) {
			$cn = '';
			if (isset($this->attributes['cn'][0])) {
				$cn = $this->attributes['cn'][0];
			}
			$subnetInput = new htmlTableExtendedInputField(_('Subnet'), 'cn', $cn, 'subnet');
			$subnetInput->setRequired(true);
			$return->addElement($subnetInput);
			$return->addElement(new htmlOutputText(_('Example') . ": 192.168.10.0"), true);
		}
		// domain name
		$return->addElement(new htmlTableExtendedInputField(_('Domain name'), 'domainname', $this->getDHCPOption('domain-name'), 'domainname'), true);
		// lease Time
		$leasetimeInput = new htmlTableExtendedInputField(_('Lease time'), 'lease_time', $this->getDefaultLeaseTime(), 'leasetime');
		$leasetimeInput->setValidationRule(htmlElement::VALIDATE_NUMERIC);
		$return->addElement($leasetimeInput, true);
		// max lease time
		$max_leasetimeInput = new htmlTableExtendedInputField(_('Maximum lease time'), 'max_lease_time', $this->getMaxLeaseTime(), 'max_leasetime');
		$max_leasetimeInput->setValidationRule(htmlElement::VALIDATE_NUMERIC);
		$return->addElement($max_leasetimeInput, true);
		// DNS
		$return->addElement(new htmlTableExtendedInputField(_('DNS'), 'dns', $this->getDHCPOption('domain-name-servers'), 'dns'), true);
		// gateway
		$return->addElement(new htmlTableExtendedInputField(_('Default gateway'), 'routers', $this->getDHCPOption('routers'), 'gateway'), true);
		// netbios name servers
		$return->addElement(new htmlTableExtendedInputField(_('Netbios name servers'), 'netbios', $this->getDHCPOption('netbios-name-servers'), 'netbios'), true);
		// netbios node type
		$nodeType = $this->getDHCPOption('netbios-node-type');
		if ($nodeType == '') {
			$nodeType = 8;
		}
		$nodeOptions = array();
		foreach ($this->all_netbios_node_types as $key => $value) {
			$nodeOptions[$value] = $key;
		}
		$nodeSelect = new htmlTableExtendedSelect('netbios_node_type', $nodeOptions, array($nodeType), _('Netbios node type'), 'netbios_type');
		$nodeSelect->setHasDescriptiveElements(true);
		$return->addElement($nodeSelect, true);
		
		if ($this->getAccountContainer()->dn_orig!=$_SESSION['config']->get_suffix('dhcp')) {
			// unknown clients
			$unknownClients = $this->getUnknownClients();
			if (empty($unknownClients)) {
				$unknownClients = '-';
			}
			$unknownClientsOptions = array_flip($this->allowDenyOptions);
			$unknownClientsSelect = new htmlTableExtendedSelect('unknownClients', $unknownClientsOptions, array($unknownClients), _('Unknown clients'), 'unknownClients');
			$unknownClientsSelect->setHasDescriptiveElements(true);
			$return->addElement($unknownClientsSelect, true);
			// subnetmask
			$subnetMaskInput = new htmlTableExtendedInputField(_('Subnet mask'), 'subnet', $this->getDHCPOption('subnet-mask'), 'subnetmask');
			$subnetMaskInput->setRequired(true);
			$return->addElement($subnetMaskInput, true);
			// netmask
			$return->addElement(new htmlOutputText(_('Net mask')));
			$return->addElement(new htmlOutputText($this->attributes['dhcpNetMask'][0]));
			$return->addElement(new htmlHelpLink('netmask'), true);
		}

		// description
		$description = '';
		if (isset($this->attributes['dhcpComments'][0])) {
			$description = $this->attributes['dhcpComments'][0];
		}
		$return->addElement(new htmlTableExtendedInputField(_('Description'), 'description', $description, 'description'), true);
		return $return;
	}
	
	/**
	* Loads the values of an account profile into internal variables.
	*
	* @param array $profile hash array with profile values (identifier => value)
	*/
	function load_profile($profile) {
		// profile mappings in meta data
		parent::load_profile($profile);
		$this->attributes['cn'][0] = $profile['cn'][0];
		
		$this->setDefaultLeaseTime($profile['lease_time'][0]);
		$this->setMaxLeaseTime($profile['max_lease_time'][0]);
		
		$this->setDHCPOption('domain-name', $profile['domainname'][0]);
		$this->setDHCPOption('domain-name-servers', $profile['dns'][0]);
		$this->setDHCPOption('routers', $profile['routers'][0]);
		$this->setDHCPOption('netbios-name-servers', $profile['netbios'][0]);
		$this->setDHCPOption('netbios-node-type', $profile['netbios_node_type'][0]);
		
		if ($this->getAccountContainer()->dn_orig!=$_SESSION['config']->get_suffix('dhcp')) {
			$this->setDHCPOption('subnet-mask', $profile['subnet'][0]);

	        // calc the netmask:
			$ex=explode(".", $profile['subnet'][0]);
			$num = 0;
			foreach($ex AS $mask) {
			    $binary = decbin($mask);
			    $num += substr_count($binary, 1);
			}
			$this->attributes['dhcpNetMask'][0] = $num;
		}
	}
	
	/**
	 * Returns a list of possible PDF entries for this account.
	 *
	 * @param array $pdfKeys list of PDF keys that are included in document
	 * @return list of PDF entries (array(<PDF key> => <PDF lines>))
	 */
	function get_pdfEntries($pdfKeys) {
		$nodeType = $this->getDHCPOption('netbios-node-type');
		$nodeTypeValue = '';
		if (isset($this->all_netbios_node_types[$nodeType])) {
			$nodeTypeValue = $this->all_netbios_node_types[$nodeType];
		}
		$unknownClients = '';
		$unknownClientsVal = $this->getUnknownClients();
		if (!empty($unknownClientsVal)) {
			$unknownClients = $this->allowDenyOptions[$unknownClientsVal];
		}
		$return = array();
		$this->addPDFKeyValue($return, 'domainName', _('Domain name'), $this->getDHCPOption('domain-name'));
		$this->addPDFKeyValue($return, 'leaseTime', _('Lease time'), $this->getDefaultLeaseTime());
		$this->addPDFKeyValue($return, 'maxLeaseTime', _('Maximum lease time'), $this->getMaxLeaseTime());
		$this->addPDFKeyValue($return, 'DNSserver', _('DNS'), $this->getDHCPOption('domain-name-servers'));
		$this->addPDFKeyValue($return, 'gateway', _('Default gateway'), $this->getDHCPOption('routers'));
		$this->addPDFKeyValue($return, 'netbiosServer', _('Netbios name servers'), $this->getDHCPOption('netbios-name-servers'));
		$this->addPDFKeyValue($return, 'netbiosType', _('Netbios node type'), $nodeTypeValue);
		$this->addPDFKeyValue($return, 'subnetMask', _('Subnet mask'), $this->getDHCPOption('subnet-mask'));
		$this->addPDFKeyValue($return, 'unknownClients', _('Unknown clients'), $unknownClients);
		$this->addSimplePDFField($return, 'description', _('Description'), 'dhcpComments');
		$this->addSimplePDFField($return, 'subnet', _('Subnet'), 'cn');
		$this->addSimplePDFField($return, 'netMask', _('Net mask'), 'dhcpNetMask');
		return $return;
	}
	
	/**
	 * Returns a DHCP option.
	 * 
	 * @param String $name option name
	 * @return String value
	 */
	public function getDHCPOption($name) {
		$return = null;
		if (is_array($this->attributes['dhcpOption'])) {
			for ($i = 0; $i < sizeof($this->attributes['dhcpOption']); $i++) {
				$val = $this->attributes['dhcpOption'][$i];
				if (substr($val, 0, strlen($name) + 1) == ($name . ' ')) {
					$return = substr($val, strlen($name) + 1);
					$return = str_replace('"', '', $return);
					break;
				}
			}
		}
		return $return;
	}
	
	/**
	 * Sets a DHCP option.
	 * 
	 * @param String $name option name
	 * @param String $value option value
	 */
	private function setDHCPOption($name, $value) {
		if (!is_array($this->attributes['dhcpOption'])) {
			$this->attributes['dhcpOption'] = array();
		}
		for ($i = 0; $i < sizeof($this->attributes['dhcpOption']); $i++) {
			if (substr($this->attributes['dhcpOption'][$i], 0, strlen($name) + 1) == ($name . ' ')) {
				unset($this->attributes['dhcpOption'][$i]);
				$this->attributes['dhcpOption'] = array_values($this->attributes['dhcpOption']);
			}
		}
		if (($value != null) && ($value != '')) {
			$this->attributes['dhcpOption'][] = $name . ' ' . $value;
		}
	}

	/**
	 * Returns the default lease time.
	 * 
	 * @return String time
	 */
	private function getDefaultLeaseTime() {
		$return = null;
		if (is_array($this->attributes['dhcpStatements'])) {
			for ($i = 0; $i < sizeof($this->attributes['dhcpStatements']); $i++) {
				if (substr($this->attributes['dhcpStatements'][$i], 0, 19) == 'default-lease-time ') {
					$return = substr($this->attributes['dhcpStatements'][$i],19);
					break;
				}
			}
		}
		return $return;
	}
	
	/**
	 * Sets the default lease time.
	 * 
	 * @param String $time time
	 */
	private function setDefaultLeaseTime($time) {
		if (!is_array($this->attributes['dhcpStatements'])) {
			$this->attributes['dhcpStatements'] = array();
		}
		for ($i = 0; $i < sizeof($this->attributes['dhcpStatements']); $i++) {
			if (substr($this->attributes['dhcpStatements'][$i], 0, 19) == 'default-lease-time ') {
				unset($this->attributes['dhcpStatements'][$i]);
				$this->attributes['dhcpStatements'] = array_values($this->attributes['dhcpStatements']);
			}
		}
		if (($time != null) && ($time != '')) {
			$this->attributes['dhcpStatements'][] = 'default-lease-time ' . $time;
		}
	}

	/**
	 * Returns the unknown clients option.
	 * 
	 * @return String unknown clients value
	 */
	private function getUnknownClients() {
		$return = null;
		if (is_array($this->attributes['dhcpStatements'])) {
			for ($i = 0; $i < sizeof($this->attributes['dhcpStatements']); $i++) {
				$val = $this->attributes['dhcpStatements'][$i];
				if (strpos($val, 'unknown-clients') === (strlen($val) - strlen('unknown-clients'))) {
					$return = substr($val,0, (strlen($val) - strlen('unknown-clients') - 1));
					break;
				}
			}
		}
		return $return;
	}
	
	/**
	 * Sets the unknown clients option.
	 * 
	 * @param String $option allow/deny
	 */
	private function setUnknownClients($option) {
		if (!is_array($this->attributes['dhcpStatements'])) {
			$this->attributes['dhcpStatements'] = array();
		}
		for ($i = 0; $i < sizeof($this->attributes['dhcpStatements']); $i++) {
			$val = $this->attributes['dhcpStatements'][$i];
			if (strpos($val, 'unknown-clients') === (strlen($val) - strlen('unknown-clients'))) {
				unset($this->attributes['dhcpStatements'][$i]);
				$this->attributes['dhcpStatements'] = array_values($this->attributes['dhcpStatements']);
			}
		}
		if (!empty($option) && ($option != '-')) {
			$this->attributes['dhcpStatements'][] = $option . ' unknown-clients';
		}
	}

	/**
	 * Returns the maximum lease time.
	 * 
	 * @return String time
	 */
	private function getMaxLeaseTime() {
		$return = null;
		if (is_array($this->attributes['dhcpStatements'])) {
			for ($i = 0; $i < sizeof($this->attributes['dhcpStatements']); $i++) {
				if (substr($this->attributes['dhcpStatements'][$i], 0, 15) == 'max-lease-time ') {
					$return = substr($this->attributes['dhcpStatements'][$i],15);
					break;
				}
			}
		}
		return $return;
	}
	
	/**
	 * Sets the maximum lease time.
	 * 
	 * @param String $time time
	 */
	private function setMaxLeaseTime($time) {
		if (!is_array($this->attributes['dhcpStatements'])) {
			$this->attributes['dhcpStatements'] = array();
		}
		for ($i = 0; $i < sizeof($this->attributes['dhcpStatements']); $i++) {
			if (substr($this->attributes['dhcpStatements'][$i], 0, 15) == 'max-lease-time ') {
				unset($this->attributes['dhcpStatements'][$i]);
				$this->attributes['dhcpStatements'] = array_values($this->attributes['dhcpStatements']);
			}
		}
		if (($time != null) && ($time != '')) {
			$this->attributes['dhcpStatements'][] = 'max-lease-time ' . $time;
		}
	}
	
	/**
	* In this function the LDAP account is built up.
	*
	* @param array $rawAccounts list of hash arrays (name => value) from user input
	* @param array $ids list of IDs for column position (e.g. "posixAccount_uid" => 5)
	* @param array $partialAccounts list of hash arrays (name => value) which are later added to LDAP
	* @param array $selectedModules list of selected account modules
	* @return array list of error messages if any
	*/
	function build_uploadAccounts($rawAccounts, $ids, &$partialAccounts, $selectedModules) {
		$messages = array();
		for ($i = 0; $i < sizeof($rawAccounts); $i++) {
			// add object class
			if (!in_array("dhcpOptions", $partialAccounts[$i]['objectClass'])) $partialAccounts[$i]['objectClass'][] = "dhcpOptions";
			if (!in_array("dhcpSubnet", $partialAccounts[$i]['objectClass'])) $partialAccounts[$i]['objectClass'][] = "dhcpSubnet";
			// subnet
			if (check_ip($rawAccounts[$i][$ids['dhcp_settings_subnet']],true)) {
				$partialAccounts[$i]['cn'] = $rawAccounts[$i][$ids['dhcp_settings_subnet']];
			}
			else {
				$error = $this->messages['cn'][3];
				array_push($error, $i);
				$messages[] = $error;
			}
			// domain name
			if ($rawAccounts[$i][$ids['dhcp_settings_domainName']] != "") {
				if (preg_match("/^[A-Za-z0-9\\._-]*$/", $rawAccounts[$i][$ids['dhcp_settings_domainName']])) {
					$partialAccounts[$i]['dhcpOption'][] = "domain-name \"".$rawAccounts[$i][$ids['dhcp_settings_domainName']]."\"";
				}
				else {
					$error = $this->messages['domainname'][5];
					array_push($error, $i);
					$messages[] = $error;
				}
			}
			// lease time
			if ($rawAccounts[$i][$ids['dhcp_settings_leaseTime']] != '') {
				if (is_numeric($rawAccounts[$i][$ids['dhcp_settings_leaseTime']])) {
					$partialAccounts[$i]['dhcpStatements'][] = 'default-lease-time ' . $rawAccounts[$i][$ids['dhcp_settings_leaseTime']];
				}
				else {
					$error = $this->messages['lease_time'][1];
					array_push($error, $i);
					$messages[] = $error;
				}
			}
			// max lease time
			if ($rawAccounts[$i][$ids['dhcp_settings_maxLeaseTime']] != '') {
				if (is_numeric($rawAccounts[$i][$ids['dhcp_settings_maxLeaseTime']])) {
					$partialAccounts[$i]['dhcpStatements'][] = 'max-lease-time ' . $rawAccounts[$i][$ids['dhcp_settings_maxLeaseTime']];
				}
				else {
					$error = $this->messages['max_lease_time'][1];
					array_push($error, $i);
					$messages[] = $error;
				}
			}
			// DNS
			if ($rawAccounts[$i][$ids['dhcp_settings_DNSserver']] != '') {
				$ex = explode(",", $rawAccounts[$i][$ids['dhcp_settings_DNSserver']]);
				$invalid = false;
				foreach($ex AS $string) {
		            if (!check_ip($string)) {
				        $invalid = true;
				    }
				}
				if (!$invalid) {
					$partialAccounts[$i]['dhcpOption'][] = 'domain-name-servers ' . $rawAccounts[$i][$ids['dhcp_settings_DNSserver']];
				}
				else {
					$error = $this->messages['dns'][1];
					array_push($error, $i);
					$messages[] = $error;
				}
			}
			// gateway
			if ($rawAccounts[$i][$ids['dhcp_settings_gateway']] != '') {
				if (check_ip($rawAccounts[$i][$ids['dhcp_settings_gateway']])) {
					$partialAccounts[$i]['dhcpOption'][] = "routers ".$rawAccounts[$i][$ids['dhcp_settings_gateway']];
				}
				else {
					$error = $this->messages['routers'][1];
					array_push($error, $i);
					$messages[] = $error;
				}
			}
			// netbios name servers
			if ($rawAccounts[$i][$ids['dhcp_settings_netbiosServer']] != '') {
				$ex = explode(",", $rawAccounts[$i][$ids['dhcp_settings_netbiosServer']]);
				$invalid = false;
				foreach($ex AS $string) {
		            if (!check_ip($string) && !get_preg($string, 'DNSname')) {
				        $invalid = true;
				    }
				}
				if (!$invalid) {
					$partialAccounts[$i]['dhcpOption'][] = "netbios-name-servers " . $rawAccounts[$i][$ids['dhcp_settings_netbiosServer']];
				}
				else {
					$error = $this->messages['netbios'][1];
					array_push($error, $i);
					$messages[] = $error;
				}
			}
			// node type
			if ($rawAccounts[$i][$ids['dhcp_settings_netbiosType']] != '') {
				if (in_array($rawAccounts[$i][$ids['dhcp_settings_netbiosType']], array('B', 'P', 'M', 'H'))) {
					if ($rawAccounts[$i][$ids['dhcp_settings_netbiosType']] == 'B') {
						$partialAccounts[$i]['dhcpOption'][] = "netbios-node-type 1";
					}
					elseif ($rawAccounts[$i][$ids['dhcp_settings_netbiosType']] == 'P') {
						$partialAccounts[$i]['dhcpOption'][] = "netbios-node-type 2";
					}
					elseif ($rawAccounts[$i][$ids['dhcp_settings_netbiosType']] == 'M') {
						$partialAccounts[$i]['dhcpOption'][] = "netbios-node-type 4";
					}
					elseif ($rawAccounts[$i][$ids['dhcp_settings_netbiosType']] == 'H') {
						$partialAccounts[$i]['dhcpOption'][] = "netbios-node-type 8";
					}
				}
				else {
					$error = $this->messages['netbios_node_type'][1];
					array_push($error, $i);
					$messages[] = $error;
				}
			}
			else {
				$partialAccounts[$i]['dhcpOption'][] = "netbios-node-type 8"; // default H
			}
			// unknown clients
			if (!empty($rawAccounts[$i][$ids['dhcp_settings_unknownClients']])) {
				$unknownClients = $rawAccounts[$i][$ids['dhcp_settings_unknownClients']];
				if (in_array($unknownClients, $this->allowDenyOptions)) {
					$allowDenyOptions = array_flip($this->allowDenyOptions);
					$partialAccounts[$i]['dhcpStatements'][] = $allowDenyOptions[$unknownClients] . ' unknown-clients';
				}
				else {
					$error = $this->messages['unknownClients'][0];
					array_push($error, $i);
					$messages[] = $error;
				}
			}
			// subnet mask
			if (check_ip($rawAccounts[$i][$ids['dhcp_settings_subnetMask']],true)) {
				$partialAccounts[$i]['dhcpOption'][] = "subnet-mask ".$rawAccounts[$i][$ids['dhcp_settings_subnetMask']];
			}
			else {
				$error = $this->messages['subnet'][1];
				array_push($error, $i);
				$messages[] = $error;
			}
			// net mask
			$mask = $this->calculateNetMask($rawAccounts[$i][$ids['dhcp_settings_subnetMask']]);
			$partialAccounts[$i]['dhcpNetMask'][0] = $mask;
			// description
			if (isset($rawAccounts[$i][$ids['dhcp_settings_description']]) && ($rawAccounts[$i][$ids['dhcp_settings_description']] != '')) {
				$partialAccounts[$i]['dhcpComments'][0] = $rawAccounts[$i][$ids['dhcp_settings_description']];
			}
		}
		return $messages;
	}


}

?>