<?php

/*
    Copyright (C) 2014-2016 Deciso B.V.
    Copyright (C) 2003-2004 Manuel Kasper <mk@neon1.net>.
    Copyright (C) 2010 Seth Mos <seth.mos@dds.nl>.
    All rights reserved.

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions are met:

    1. Redistributions of source code must retain the above copyright notice,
       this list of conditions and the following disclaimer.

    2. Redistributions in binary form must reproduce the above copyright
       notice, this list of conditions and the following disclaimer in the
       documentation and/or other materials provided with the distribution.

    THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
    INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
    AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
    AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
    OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
    POSSIBILITY OF SUCH DAMAGE.
*/

require_once("guiconfig.inc");
require_once("filter.inc");
require_once("system.inc");
require_once("interfaces.inc");
require_once("services.inc");

/**
 * restart dhcp service
 */
function reconfigure_dhcpd()
{
    system_hosts_generate();
    clear_subsystem_dirty('hosts');
    services_dhcpd_configure();
    clear_subsystem_dirty('staticmaps');
}

if ($_SERVER['REQUEST_METHOD'] === 'GET') {
    // handle identifiers and action
    if (!empty($_GET['if']) && !empty($config['interfaces'][$_GET['if']])) {
        $if = $_GET['if'];
    } else {
        $savemsg = gettext(
          "The DHCPv6 Server can only be enabled on interfaces configured with static " .
          "IP addresses. Only interfaces configured with a static IP will be shown."
        );
        foreach (legacy_config_get_interfaces(array("virtual" => false)) as $if_id => $intf) {
            if (!empty($intf['enable']) && isset($intf['ipaddrv6']) && is_ipaddrv6($intf['ipaddrv6']) && !is_linklocal($intf['ipaddrv6'])) {
                $if = $if_id;
                break;
            }
        }
    }
    $pconfig = array();

    if (!empty($config['dhcpdv6'][$if]['range'])) {
        $pconfig['range_from'] = $config['dhcpdv6'][$if]['range']['from'];
        $pconfig['range_to'] = $config['dhcpdv6'][$if]['range']['to'];
    }
    if (!empty($config['dhcpdv6'][$if]['prefixrange'])) {
        $pconfig['prefixrange_from'] = $config['dhcpdv6'][$if]['prefixrange']['from'];
        $pconfig['prefixrange_to'] = $config['dhcpdv6'][$if]['prefixrange']['to'];
        $pconfig['prefixrange_length'] = $config['dhcpdv6'][$if]['prefixrange']['prefixlength'];
    }
    $config_copy_fieldsnames = array('defaultleasetime', 'maxleasetime', 'domain', 'domainsearchlist', 'ddnsdomain',
        'ddnsdomainprimary', 'ddnsdomainkeyname', 'ddnsdomainkey', 'ldap', 'bootfile_url', 'netmask',
        'numberoptions', 'dhcpv6leaseinlocaltime', 'staticmap');
    foreach ($config_copy_fieldsnames as $fieldname) {
        if (isset($config['dhcpdv6'][$if][$fieldname])) {
            $pconfig[$fieldname] = $config['dhcpdv6'][$if][$fieldname];
        } else {
            $pconfig[$fieldname] = null;
        }
    }
    // handle booleans
    $pconfig['enable'] = isset($config['dhcpdv6'][$if]['enable']);
    $pconfig['ddnsupdate'] = isset($config['dhcpdv6'][$if]['ddnsupdate']);
    $pconfig['netboot'] = isset($config['dhcpdv6'][$if]['netboot']);

    // handle arrays
    $pconfig['staticmap'] = empty($pconfig['staticmap']) ? array() : $pconfig['staticmap'];
    $pconfig['numberoptions'] = empty($pconfig['numberoptions']) ? array() : $pconfig['numberoptions'];
    $pconfig['dns1'] = !empty($config['dhcpdv6'][$if]['dnsserver'][0]) ? $config['dhcpdv6'][$if]['dnsserver'][0] : "";
    $pconfig['dns2'] = !empty($config['dhcpdv6'][$if]['dnsserver'][1]) ? $config['dhcpdv6'][$if]['dnsserver'][1] : "";
    $pconfig['ntp1'] = !empty($config['dhcpdv6'][$if]['ntpserver'][0]) ? $config['dhcpdv6'][$if]['ntpserver'][0] : "";
    $pconfig['ntp2'] = !empty($config['dhcpdv6'][$if]['ntpserver'][1]) ? $config['dhcpdv6'][$if]['ntpserver'][1] : "";

} elseif ($_SERVER['REQUEST_METHOD'] === 'POST') {
    // handle identifiers and actions
    if (!empty($_POST['if']) && !empty($config['interfaces'][$_POST['if']])) {
        $if = $_POST['if'];
    }
    if (!empty($_POST['act'])) {
        $act = $_POST['act'];
    } else {
        $act = null;
    }
    $pconfig = $_POST;
    $input_errors = array();

    if (isset($pconfig['submit'])) {
        // transform Additional BOOTP/DHCP Options
        $pconfig['numberoptions'] =  array();
        if (isset($pconfig['numberoptions_number'])) {
            $pconfig['numberoptions']['item'] = array();
            foreach ($pconfig['numberoptions_number'] as $opt_seq => $opt_number) {
                if (!empty($opt_number)) {
                    $pconfig['numberoptions']['item'][] = array('number' => $opt_number,
                                                                'type' => $pconfig['numberoptions_type'][$opt_seq],
                                                                'value' => $pconfig['numberoptions_value'][$opt_seq]
                                                          );
                }
            }
        }
        /* input validation */
        $reqdfields = explode(" ", "range_from range_to");
        $reqdfieldsn = array(gettext("Range begin"),gettext("Range end"));
        do_input_validation($pconfig, $reqdfields, $reqdfieldsn, $input_errors);

        if (!empty($pconfig['prefixrange_from']) && !is_ipaddrv6($pconfig['prefixrange_from'])) {
            $input_errors[] = gettext("A valid range must be specified.");
        }
        if (!empty($pconfig['prefixrange_to']) && !is_ipaddrv6($pconfig['prefixrange_to'])) {
            $input_errors[] = gettext("A valid prefix range must be specified.");
        }
        if (!empty($pconfig['range_from']) && !is_ipaddrv6($pconfig['range_from'])) {
            $input_errors[] = gettext("A valid range must be specified.");
        }
        if (!empty($pconfig['range_to']) && !is_ipaddrv6($pconfig['range_to'])) {
            $input_errors[] = gettext("A valid range must be specified.");
        }
        if (!empty($pconfig['gateway']) && !is_ipaddrv6($pconfig['gateway'])) {
            $input_errors[] = gettext("A valid IPv6 address must be specified for the gateway.");
        }
        if ((!empty($pconfig['dns1']) && !is_ipaddrv6($pconfig['dns1'])) || (!empty($pconfig['dns2']) && !is_ipaddrv6($pconfig['dns2']))) {
            $input_errors[] = gettext("A valid IPv6 address must be specified for the primary/secondary DNS servers.");
        }

        if (!empty($pconfig['defaultleasetime']) && (!is_numeric($pconfig['defaultleasetime']) || ($pconfig['defaultleasetime'] < 60))) {
            $input_errors[] = gettext("The default lease time must be at least 60 seconds.");
        }
        if (!empty($pconfig['maxleasetime']) && (!is_numeric($pconfig['maxleasetime']) || ($pconfig['maxleasetime'] < 60) || ($pconfig['maxleasetime'] <= $_POST['defaultleasetime']))) {
            $input_errors[] = gettext("The maximum lease time must be at least 60 seconds and higher than the default lease time.");
        }
        if (!empty($pconfig['ddnsdomain']) && !is_domain($pconfig['ddnsdomain'])) {
            $input_errors[] = gettext("A valid domain name must be specified for the dynamic DNS registration.");
        }
        if (!empty($pconfig['ddnsdomain']) && !is_ipaddrv4($pconfig['ddnsdomainprimary'])) {
            $input_errors[] = gettext("A valid primary domain name server IPv4 address must be specified for the dynamic domain name.");
        }
        if (!empty($pconfig['ddnsdomainkey']) && base64_encode(base64_decode($pconfig['ddnsdomainkey'], true)) !== $pconfig['ddnsdomainkey']) {
            $input_errors[] = gettext('You must specify a Base64-encoded domain key.');
        }
        if ((!empty($pconfig['ddnsdomainkey']) && empty($pconfig['ddnsdomainkeyname'])) ||
          (!empty($pconfig['ddnsdomainkeyname']) && empty($pconfig['ddnsdomainkey']))) {
            $input_errors[] = gettext("You must specify both a valid domain key and key name.");
        }
        if (!empty($pconfig['domainsearchlist'])) {
            $domain_array=preg_split("/[ ;]+/",$pconfig['domainsearchlist']);
            foreach ($domain_array as $curdomain) {
                if (!is_domain($curdomain)) {
                    $input_errors[] = gettext("A valid domain search list must be specified.");
                    break;
                }
            }
        }

        if ((!empty($pconfig['ntp1']) && !is_ipaddrv6($pconfig['ntp1'])) || (!empty($pconfig['ntp2']) && !is_ipaddrv6($pconfig['ntp2']))) {
            $input_errors[] = gettext("A valid IPv6 address must be specified for the primary/secondary NTP servers.");
        }
        if (!empty($pconfig['domain']) && !is_domain($pconfig['domain'])) {
            $input_errors[] = gettext("A valid domain name must be specified for the DNS domain.");
        }
        if (!empty($pconfig['bootfile_url']) && !is_URL($pconfig['bootfile_url'])) {
            $input_errors[] = gettext("A valid URL must be specified for the network bootfile.");
        }

        // Disallow a range that includes the virtualip
        if (!empty($config['virtualip']['vip'])) {
            foreach($config['virtualip']['vip'] as $vip) {
                if($vip['interface'] == $if) {
                    if (!empty($vip['subnetv6']) && is_inrange_v6($vip['subnetv6'], $pconfig['range_from'], $pconfig['range_to'])) {
                        $input_errors[] = sprintf(gettext("The subnet range cannot overlap with virtual IPv6 address %s."),$vip['subnetv6']);
                    }
                }
            }
        }

        if (count($input_errors) == 0) {
            /* make sure the range lies within the current subnet */
            $ifcfgip = get_interface_ipv6($if);
            $ifcfgsn = get_interface_subnetv6($if);
            $subnet_start = gen_subnetv6($ifcfgip, $ifcfgsn);
            $subnet_end = gen_subnetv6_max($ifcfgip, $ifcfgsn);

            if (is_ipaddrv6($ifcfgip)) {
                if ((!is_inrange_v6($pconfig['range_from'], $subnet_start, $subnet_end)) ||
                  (!is_inrange_v6($pconfig['range_to'], $subnet_start, $subnet_end))) {
                    $input_errors[] = gettext("The specified range lies outside of the current subnet.");
                }
            }
            /* "from" cannot be higher than "to" */
            if (inet_pton($pconfig['range_from']) > inet_pton($pconfig['range_to'])) {
                $input_errors[] = gettext("The range is invalid (first element higher than second element).");
            }

            /* make sure that the DHCP Relay isn't enabled on this interface */
            if (isset($config['dhcrelay'][$if]['enable'])) {
                $input_errors[] = sprintf(gettext("You must disable the DHCP relay on the %s interface before enabling the DHCP server."),
                    !empty($config['interfaces'][$if]['descr']) ? htmlspecialchars($config['interfaces'][$if]['descr']) : strtoupper($if));
            }


            /* Verify static mappings do not overlap:
               - available DHCP range
               - prefix delegation range (FIXME: still need to be completed) */
            $dynsubnet_start = inet_pton($pconfig['range_from']);
            $dynsubnet_end = inet_pton($pconfig['range_to']);
            if (!empty($config['dhcpdv6'][$if]['staticmap'])) {
                foreach ($config['dhcpdv6'][$if]['staticmap'] as $map) {
                    if (!empty($map['ipaddrv6']) && inet_pton($map['ipaddrv6']) > $dynsubnet_start && inet_pton($map['ipaddrv6']) < $dynsubnet_end) {
                        $input_errors[] = sprintf(gettext("The DHCP range cannot overlap any static DHCP mappings."));
                        break;
                    }
                }
            }
        }

        if (count($input_errors) == 0) {
            $dhcpdconf = array();
            if (empty($config['dhcpdv6']) || !is_array($config['dhcpdv6'])) {
                $config['dhcpdv6'] = array();
            }
            if (empty($config['dhcpdv6'][$if]) || !is_array($config['dhcpdv6'][$if])) {
                $config['dhcpdv6'][$if] = array();
            }

            // simple 1-on-1 copy
            $config_copy_fieldsnames = array('defaultleasetime', 'maxleasetime', 'netmask', 'domain', 'domainsearchlist',
              'ddnsdomain', 'ddnsdomainprimary', 'ddnsdomainkeyname', 'ddnsdomainkey', 'ldap', 'bootfile_url',
              'dhcpv6leaseinlocaltime');
            foreach ($config_copy_fieldsnames as $fieldname) {
                if (!empty($pconfig[$fieldname])) {
                    $dhcpdconf[$fieldname] = $pconfig[$fieldname];
                }
            }

            $dhcpdv6_enable_changed = !empty($pconfig['enable']) != !empty($config['dhcpdv6'][$if]['enable']);

            // boolean types
            $dhcpdconf['netboot'] = !empty($pconfig['netboot']);
            $dhcpdconf['enable'] = !empty($pconfig['enable']);
            $dhcpdconf['ddnsupdate'] = !empty($pconfig['ddnsupdate']);

            // array types
            $dhcpdconf['range'] = array();
            $dhcpdconf['range']['from'] = $pconfig['range_from'];
            $dhcpdconf['range']['to'] = $pconfig['range_to'];
            $dhcpdconf['prefixrange'] = array();
            $dhcpdconf['prefixrange']['from'] = $pconfig['prefixrange_from'];
            $dhcpdconf['prefixrange']['to'] = $pconfig['prefixrange_to'];
            $dhcpdconf['prefixrange']['prefixlength'] = $pconfig['prefixrange_length'];
            $dhcpdconf['dnsserver'] = array();
            if (!empty($pconfig['dns1'])) {
                $dhcpdconf['dnsserver'][] = $pconfig['dns1'];
            }
            if (!empty($pconfig['dns2'])) {
                $dhcpdconf['dnsserver'][] = $pconfig['dns2'];
            }
            $dhcpdconf['ntpserver'] = [];
            if (!empty($pconfig['ntp1'])) {
                $dhcpdconf['ntpserver'][] = $pconfig['ntp1'];
            }
            if (!empty($pconfig['ntp2'])) {
                $dhcpdconf['ntpserver'][] = $pconfig['ntp2'];
            }
            $dhcpdconf['numberoptions'] = $pconfig['numberoptions'];

            // copy structures back in
            foreach (array('staticmap') as $fieldname) {
                if (!empty($config['dhcpdv6'][$if][$fieldname])) {
                    $dhcpdconf[$fieldname] = $config['dhcpdv6'][$if][$fieldname];
                }
            }
            // router advertisement data lives in the same spot, copy
            foreach (array_keys($config['dhcpdv6'][$if]) as $fieldname) {
                if (substr($fieldname,0 ,2) == 'ra' && !in_array($fieldname, array_keys($dhcpdconf))) {
                    $dhcpdconf[$fieldname] = $config['dhcpdv6'][$if][$fieldname];
                }
            }
            $config['dhcpdv6'][$if] = $dhcpdconf;

            write_config();

            reconfigure_dhcpd();
            if ($dhcpdv6_enable_changed) {
                filter_configure();
            }

            header(url_safe('Location: /services_dhcpv6.php?if=%s', array($if)));
            exit;
        }
    } elseif (isset($pconfig['apply'])) {
        reconfigure_dhcpd();
        header(url_safe('Location: /services_dhcpv6.php?if=%s', array($if)));
        exit;
    } elseif ($act == "del") {
        if (!empty($config['dhcpdv6'][$if]['staticmap'][$_POST['id']])) {
            unset($config['dhcpdv6'][$if]['staticmap'][$_POST['id']]);
            write_config();
            if (isset($config['dhcpdv6'][$if]['enable'])) {
                mark_subsystem_dirty('staticmapsv6');
                mark_subsystem_dirty('hosts');
            }
        }
        exit;
    }

}

$service_hook = 'dhcpd6';

legacy_html_escape_form_data($pconfig);

include("head.inc");

?>

<body>
<script type="text/javascript">
  $( document ).ready(function() {
    /**
     * Additional BOOTP/DHCP Options extenable table
     */
    function removeRow() {
        if ( $('#numberoptions_table > tbody > tr').length == 1 ) {
            $('#numberoptions_table > tbody > tr:last > td > input').each(function(){
              $(this).val("");
            });
        } else {
            $(this).parent().parent().remove();
        }
    }
    // add new detail record
    $("#addNew").click(function(){
        // copy last row and reset values
        $('#numberoptions_table > tbody').append('<tr>'+$('#numberoptions_table > tbody > tr:last').html()+'</tr>');
        $('#numberoptions_table > tbody > tr:last > td > input').each(function(){
          $(this).val("");
        });
        $(".act-removerow").click(removeRow);
    });
    $(".act-removerow").click(removeRow);

    // delete static action
    $(".act_delete_static").click(function(event){
      event.preventDefault();
      var id = $(this).data("id");
      var intf = $(this).data("if");
      // delete single
      BootstrapDialog.show({
        type:BootstrapDialog.TYPE_DANGER,
        title: "<?= gettext("DHCP");?>",
        message: "<?=gettext("Do you really want to delete this mapping?");?>",
        buttons: [{
                  label: "<?= gettext("No");?>",
                  action: function(dialogRef) {
                      dialogRef.close();
                  }}, {
                  label: "<?= gettext("Yes");?>",
                  action: function(dialogRef) {
                    $.post(window.location, {act: 'del', id:id, if:intf}, function(data) {
                        location.reload();
                    });
                }
              }]
      });
    });
  });
</script>

<script type="text/javascript">
  function show_shownumbervalue() {
    $("#shownumbervaluebox").hide();
    $("#shownumbervalue").show();
  }

  function show_ddns_config() {
    $("#showddnsbox").hide();
    $("#showddns").show();
  }
  function show_ntp_config() {
    $("#showntpbox").hide();
    $("#showntp").show();
  }

  function show_ldap_config() {
    $("#showldapbox").hide();
    $("#showldap").show();
  }

  function show_netboot_config() {
    $("#shownetbootbox").hide();
    $("#shownetboot").show();
  }
</script>


<?php include("fbegin.inc"); ?>
  <section class="page-content-main">
    <div class="container-fluid">
      <div class="row">
        <?php if (isset($input_errors) && count($input_errors) > 0) print_input_errors($input_errors); ?>
        <?php if (isset($savemsg)) print_info_box($savemsg); ?>
        <?php if (is_subsystem_dirty('staticmaps')): ?><p>
        <?php print_info_box_apply(gettext("The static mapping configuration has been changed") . ".<br />" . gettext("You must apply the changes in order for them to take effect."));?><br />
        <?php endif; ?>
        <section class="col-xs-12">
<?php
        /* active tabs */
        $tab_array = array();
        foreach (legacy_config_get_interfaces(array("virtual" => false)) as $if_id => $intf) {
            if (isset($intf['enable']) && isset($intf['ipaddrv6']) && is_ipaddrv6($intf['ipaddrv6'])) {
                $ifname = !empty($intf['descr']) ? htmlspecialchars($intf['descr']) : strtoupper($if_id);
                $tab_array[] = array($ifname, $if_id == $if, "services_dhcpv6.php?if={$if_id}");
            }
        }

        display_top_tabs($tab_array);
        ?>
        <div class="tab-content content-box col-xs-12">
          <form method="post" name="iform" id="iform">
              <?php if (!empty($config['dhcrelay6']['enabled'])): ?>
              <?php print_content_box(gettext('DHCP Relay is currently enabled. Cannot enable the DHCP Server service while the DHCP Relay is enabled on any interface.')); ?>
              <?php elseif (count($tab_array) == 0):?>
              <?php print_content_box(gettext('No interfaces found with a static IPv6 address.')); ?>
              <?php else: ?>
                <div class="table-responsive">
                  <table class="table table-striped opnsense_standard_table_form">
                    <tr>
                      <td width="22%" valign="top"></td>
                      <td width="78%" align="right">
                        <small><?=gettext("full help"); ?> </small>
                        <i class="fa fa-toggle-off text-danger"  style="cursor: pointer;" id="show_all_help_page" type="button"></i>
                      </td>
                    </tr>
                    <tr>
                      <td><i class="fa fa-info-circle text-muted"></i>  <?=gettext("Enable");?></td>
                      <td>
                        <input name="enable" type="checkbox" value="yes" <?php if ($pconfig['enable']) echo "checked=\"checked\""; ?> />
                        <strong><?= sprintf(gettext("Enable DHCPv6 server on " . "%s " ."interface"),!empty($config['interfaces'][$if]['descr']) ? htmlspecialchars($config['interfaces'][$if]['descr']) : strtoupper($if));?></strong>
                      </td>
                    </tr>
                    <tr>
                      <td><i class="fa fa-info-circle text-muted"></i> <?=gettext("Subnet");?></td>
                      <td>
                        <?=gen_subnetv6($config['interfaces'][$if]['ipaddrv6'], $config['interfaces'][$if]['subnetv6']);?>
                      </td>
                    </tr>
                    <tr>
                      <td><i class="fa fa-info-circle text-muted"></i> <?=gettext("Subnet mask");?></td>
                      <td>
                        <?=htmlspecialchars($config['interfaces'][$if]['subnetv6']);?> <?=gettext("bits");?>
                      </td>
                    </tr>
                      <tr>
                      <td><i class="fa fa-info-circle text-muted"></i> <?=gettext("Available range");?></td>
                      <td>
<?php
                        $range_from = gen_subnetv6($config['interfaces'][$if]['ipaddrv6'], $config['interfaces'][$if]['subnetv6']);
                        $range_from++;
                        $range_to = gen_subnetv6_max($config['interfaces'][$if]['ipaddrv6'], $config['interfaces'][$if]['subnetv6']);?>
                        <?=$range_from;?> - <?=$range_to;?>
                      </td>
                    </tr>
                    <tr>
                      <td><i class="fa fa-info-circle text-muted"></i> <?=gettext("Range");?></td>
                      <td>
                        <table class="table table-condensed">
                          <thead>
                            <tr>
                              <th><?=gettext("from");?></th>
                              <th><?=gettext("to");?></th>
                            </tr>
                          </thead>
                          <tbody>
                            <tr>
                              <td><input name="range_from" type="text" id="range_from" value="<?=$pconfig['range_from'];?>" /></td>
                              <td><input name="range_to" type="text" id="range_to" value="<?=$pconfig['range_to'];?>" /> </td>
                            </tr>
                          </tbody>
                        </table>
                      </td>
                    </tr>
                    <tr>
                      <td><a id="help_for_prefixrange" href="#" class="showhelp"><i class="fa fa-info-circle"></i></a> <?=gettext("Prefix Delegation Range");?></td>
                      <td>
                        <table class="table table-condensed">
                          <thead>
                            <tr>
                              <th><?=gettext("from");?></th>
                              <th><?=gettext("to");?></th>
                            </tr>
                          </thead>
                          <tbody>
                            <tr>
                              <td><input name="prefixrange_from" type="text" id="range_from" value="<?=$pconfig['prefixrange_from'];?>" /></td>
                              <td><input name="prefixrange_to" type="text" id="range_to" value="<?=$pconfig['prefixrange_to'];?>" /> </td>
                            </tr>
                            <tr>
                              <td>
                                <strong><?=gettext("Prefix Delegation Size"); ?>:</strong>
                                <select name="prefixrange_length" class="formselect" id="prefixrange_length">
                                  <option value="48" <?=$pconfig['prefixrange_length'] == 48 ? "selected=\"selected\"" : ""; ?>>48</option>
                                  <option value="52" <?=$pconfig['prefixrange_length'] == 52 ? "selected=\"selected\"" : ""; ?>>52</option>
                                  <option value="56" <?=$pconfig['prefixrange_length'] == 56 ? "selected=\"selected\"" : ""; ?>>56</option>
                                  <option value="60" <?=$pconfig['prefixrange_length'] == 60 ? "selected=\"selected\"" : ""; ?>>60</option>
                                  <option value="62" <?=$pconfig['prefixrange_length'] == 62 ? "selected=\"selected\"" : ""; ?>>62</option>
                                  <option value="63" <?=$pconfig['prefixrange_length'] == 63 ? "selected=\"selected\"" : ""; ?>>63</option>
                                  <option value="64" <?=$pconfig['prefixrange_length'] == 64 ? "selected=\"selected\"" : ""; ?>>64</option>
                                </select>
                              </td>
                              <td></td>
                          </tbody>
                        </table>
                        <div class="hidden" for="help_for_prefixrange">
                          <?= gettext("You can define a Prefix range here for DHCP Prefix Delegation. This allows for assigning networks to subrouters. " .
                          "The start and end of the range must end on boundaries of the prefix delegation size."); ?>
                        </div>
                      </td>
                    </tr>
                    <tr>
                      <td><a id="help_for_dns" href="#" class="showhelp"><i class="fa fa-info-circle"></i></a> <?=gettext("DNS servers");?></td>
                      <td>
                        <input name="dns1" type="text" id="dns1" value="<?=$pconfig['dns1'];?>" /><br />
                        <input name="dns2" type="text" id="dns2" value="<?=$pconfig['dns2'];?>" />
                        <div class="hidden" for="help_for_dns">
                          <?=gettext("Leave blank to use the system default DNS servers - this interface's IP if DNS forwarder is enabled, otherwise the servers configured on the General page.");?>
                        </div>
                      </td>
                    </tr>
                    <tr>
                      <td><a id="help_for_domain" href="#" class="showhelp"><i class="fa fa-info-circle"></i></a> <?=gettext("Domain name");?></td>
                      <td>
                        <input name="domain" type="text" id="domain" value="<?=$pconfig['domain'];?>" /><br />
                        <div class="hidden" for="help_for_domain">
                          <?=gettext("The default is to use the domain name of this system as the default domain name provided by DHCP. You may specify an alternate domain name here.");?>
                        </div>
                     </td>
                    </tr>
                    <tr>
                      <td><a id="help_for_domainsearchlist" href="#" class="showhelp"><i class="fa fa-info-circle"></i></a> <?=gettext("Domain search list");?></td>
                      <td>
                        <input name="domainsearchlist" type="text" id="domainsearchlist" value="<?=$pconfig['domainsearchlist'];?>" /><br />
                        <div class="hidden" for="help_for_domainsearchlist">
                          <?=gettext("The DHCP server can optionally provide a domain search list. Use the semicolon character as separator");?>
                        </div>
                      </td>
                    </tr>
                    <tr>
                      <td><a id="help_for_defaultleasetime" href="#" class="showhelp"><i class="fa fa-info-circle"></i></a> <?=gettext("Default lease time");?> (<?=gettext("seconds");?>)</td>
                      <td>
                        <input name="defaultleasetime" type="text" value="<?=$pconfig['defaultleasetime'];?>" />
                        <div class="hidden" for="help_for_defaultleasetime">
                          <?=gettext("This is used for clients that do not ask for a specific expiration time."); ?><br />
                          <?=gettext("The default is 7200 seconds.");?>
                        </div>
                      </td>
                    </tr>
                    <tr>
                      <td><a id="help_for_maxleasetime" href="#" class="showhelp"><i class="fa fa-info-circle"></i></a> <?=gettext("Maximum lease time");?> (<?=gettext("seconds");?>)</td>
                      <td>
                        <input name="maxleasetime" type="text" id="maxleasetime" size="10" value="<?=$pconfig['maxleasetime'];?>" />
                        <div class="hidden" for="help_for_maxleasetime">
                          <?=gettext("This is the maximum lease time for clients that ask for a specific expiration time."); ?><br />
                          <?=gettext("The default is 86400 seconds.");?>
                        </div>
                      </td>
                    </tr>
                    <tr>
                      <td><a id="help_for_dhcpv6leaseinlocaltime" href="#" class="showhelp"><i class="fa fa-info-circle"></i></a> <?=gettext("Time format change"); ?></td>
                      <td>
                        <input name="dhcpv6leaseinlocaltime" type="checkbox" id="dhcpv6leaseinlocaltime" value="yes" <?=!empty($pconfig['dhcpv6leaseinlocaltime']) ? "checked=\"checked\"" : ""; ?> />
                        <strong>
                          <?=gettext("Change DHCPv6 display lease time from UTC to local time."); ?>
                        </strong>
                        <div class="hidden" for="help_for_dhcpv6leaseinlocaltime">
                          <?=gettext("By default DHCPv6 leases are displayed in UTC time. By checking this box DHCPv6 lease time will be displayed in local time and set to time zone selected. This will be used for all DHCPv6 interfaces lease time."); ?>
                        </div>
                      </td>
                    </tr>
                    <tr>
                      <td><i class="fa fa-info-circle text-muted"></i> <?=gettext("Dynamic DNS");?></td>
                      <td>
                        <div id="showddnsbox">
                          <input type="button" onclick="show_ddns_config()" value="<?=gettext("Advanced");?>" class="btn btn-xs btn-default"/> - <?=gettext("Show Dynamic DNS");?>
                        </div>
                        <div id="showddns" style="display:none">
                          <input style="vertical-align:middle" type="checkbox" value="yes" name="ddnsupdate" id="ddnsupdate" <?php if($pconfig['ddnsupdate']) echo " checked=\"checked\""; ?> />&nbsp;
                          <b><?=gettext("Enable registration of DHCP client names in DNS.");?></b><br />
                          <?=gettext("Note: Leave blank to disable dynamic DNS registration.");?><br />
                          <?=gettext("Enter the dynamic DNS domain which will be used to register client names in the DNS server.");?>
                          <input name="ddnsdomain" type="text" id="ddnsdomain" value="<?=$pconfig['ddnsdomain'];?>" />
                          <?=gettext("Enter the primary domain name server IP address for the dynamic domain name.");?><br />
                          <input name="ddnsdomainprimary" type="text" id="ddnsdomainprimary" size="20" value="<?=$pconfig['ddnsdomainprimary'];?>" />
                          <?=gettext("Enter the dynamic DNS domain key name which will be used to register client names in the DNS server.");?>
                          <input name="ddnsdomainkeyname" type="text" id="ddnsdomainkeyname" size="20" value="<?=$pconfig['ddnsdomainkeyname'];?>" />
                          <?=gettext("Enter the dynamic DNS domain key secret which will be used to register client names in the DNS server.");?>
                          <input name="ddnsdomainkey" type="text" id="ddnsdomainkey" size="20" value="<?=$pconfig['ddnsdomainkey'];?>" />
                        </div>
                      </td>
                    </tr>
                    <tr>
                      <td><i class="fa fa-info-circle text-muted"></i> <?=gettext("NTP servers");?></td>
                      <td>
                        <div id="showntpbox">
                          <input type="button" onclick="show_ntp_config()" value="<?=gettext("Advanced");?>" class="btn btn-xs btn-default"/> - <?=gettext("Show NTP configuration");?>
                        </div>
                        <div id="showntp" style="display:none">
                          <input name="ntp1" type="text" id="ntp1" value="<?=$pconfig['ntp1'];?>" /><br />
                          <input name="ntp2" type="text" id="ntp2" value="<?=$pconfig['ntp2'];?>" />
                        </div>
                      </td>
                    </tr>
                    <tr>
                      <td><i class="fa fa-info-circle text-muted"></i> <?=gettext("LDAP URI");?></td>
                      <td>
                        <div id="showldapbox">
                          <input type="button" onclick="show_ldap_config()" value="<?=gettext("Advanced");?>" class="btn btn-xs btn-default"/> - <?=gettext("Show LDAP configuration");?>
                        </div>
                        <div id="showldap" style="display:none">
                          <input name="ldap" type="text" value="<?=$pconfig['ldap'];?>" />
                          <?=gettext("Leave blank to disable. Enter a full URI for the LDAP server in the form ldap://ldap.example.com/dc=example,dc=com");?>
                        </div>
                      </td>
                    </tr>
                    <tr>
                      <td><i class="fa fa-info-circle text-muted"></i> <?=gettext("Enable network booting");?></td>
                      <td>
                        <div id="shownetbootbox">
                          <input type="button" onclick="show_netboot_config()" value="<?=gettext("Advanced");?>" class="btn btn-xs btn-default"/> - <?=gettext("Show Network booting");?>
                        </div>
                        <div id="shownetboot" style="display:none">
                          <input style="vertical-align:middle" type="checkbox" value="yes" name="netboot" id="netboot" <?=!empty($pconfig['netboot']) ? 'checked="checked"' : ""; ?> />
                          <b><?=gettext("Enables network booting.");?></b>
                          <br/>
                          <?=gettext("Enter the Bootfile URL");?>
                          <input name="bootfile_url" type="text" id="bootfile_url" value="<?=$pconfig['bootfile_url'];?>" />
                        </div>
                      </td>
                    </tr>
                    <tr>
                      <td><i class="fa fa-info-circle text-muted"></i> <?=gettext("Additional BOOTP/DHCP Options");?></td>
                      <td>
                        <div id="shownumbervaluebox">
                          <input type="button" onclick="show_shownumbervalue()" value="<?=gettext("Advanced");?>" class="btn btn-xs btn-default"/> - <?=gettext("Show Additional BOOTP/DHCP Options");?>
                        </div>
                        <div id="shownumbervalue" style="display:none">
                          <table class="table table-striped table-condensed" id="numberoptions_table">
                            <thead>
                              <tr>
                                <th></th>
                                <th id="detailsHeading1"><?=gettext("Number"); ?></th>
                                <th id="detailsHeading3"><?=gettext("Type"); ?></th>
                                <th id="updatefreqHeader" ><?=gettext("Value");?></th>
                              </tr>
                            </thead>
                            <tbody>
<?php
                            if (empty($pconfig['numberoptions']['item'])) {
                                $numberoptions = array();
                                $numberoptions[] = array('number' => null, 'value' => null, 'type' => null);
                            } else {
                                $numberoptions = $pconfig['numberoptions']['item'];
                            }
                            foreach($numberoptions as $item):?>
                              <tr>
                                <td>
                                  <div style="cursor:pointer;" class="act-removerow btn btn-default btn-xs" alt="remove"><span class="glyphicon glyphicon-minus"></span></div>
                                </td>
                                <td>
                                  <input name="numberoptions_number[]" type="text" value="<?=$item['number'];?>" />
                                </td>
                                <td>
                                  <select name="numberoptions_type[]">
                                    <option value="text" <?=$item['type'] == "text" ? "selected=\"selected\"" : "";?>>
                                      <?=gettext('Text');?>
                                    </option>
                                    <option value="string" <?=$item['type'] == "string" ? "selected=\"selected\"" : "";?>>
                                      <?=gettext('String');?>
                                    </option>
                                    <option value="boolean" <?=$item['type'] == "boolean" ? "selected=\"selected\"" : "";?>>
                                      <?=gettext('Boolean');?>
                                    </option>
                                    <option value="unsigned integer 8" <?=$item['type'] == "unsigned integer 8" ? "selected=\"selected\"" : "";?>>
                                      <?=gettext('Unsigned 8-bit integer');?>
                                    </option>
                                    <option value="unsigned integer 16" <?=$item['type'] == "unsigned integer 16" ? "selected=\"selected\"" : "";?>>
                                      <?=gettext('Unsigned 16-bit integer');?>
                                    </option>
                                    <option value="unsigned integer 32" <?=$item['type'] == "unsigned integer 32" ? "selected=\"selected\"" : "";?>>
                                      <?=gettext('Unsigned 32-bit integer');?>
                                    </option>
                                    <option value="signed integer 8" <?=$item['type'] == "signed integer 8" ? "selected=\"selected\"" : "";?>>
                                      <?=gettext('Signed 8-bit integer');?>
                                    </option>
                                    <option value="signed integer 16" <?=$item['type'] == "signed integer 16" ? "selected=\"selected\"" : "";?>>
                                      <?=gettext('Signed 16-bit integer');?>
                                    </option>
                                    <option value="signed integer 32" <?=$item['type'] == "signed integer 32" ? "selected=\"selected\"" : "";?>>
                                      <?=gettext('Signed 32-bit integer');?>
                                    </option>
                                    <option value="ip-address" <?=$item['type'] == "ip-address" ? "selected=\"selected\"" : "";?>>
                                      <?=gettext('IP address or host');?>
                                    </option>
                                  </select>
                                </td>
                                <td> <input name="numberoptions_value[]" type="text" value="<?=$item['value'];?>" /> </td>
                              </tr>
<?php
                            endforeach;?>
                            </tbody>
                            <tfoot>
                              <tr>
                                <td colspan="4">
                                  <div id="addNew" style="cursor:pointer;" class="btn btn-default btn-xs" alt="add"><span class="glyphicon glyphicon-plus"></span></div>
                                </td>
                              </tr>
                            </tfoot>
                          </table>
                          <div class="hidden" for="help_for_numberoptions">
                          <?= sprintf(gettext("Enter the DHCP option number and the value for each item you would like to include in the DHCP lease information. For a list of available options please visit this %sURL%s."),'<a href="http://www.iana.org/assignments/bootp-dhcp-parameters/" target="_blank">','</a>') ?>
                          </div>
                        </div>
                      </td>
                    </tr>
                    <tr>
                      <td>&nbsp;</td>
                      <td>
                        <input name="if" type="hidden" value="<?=$if;?>" />
                        <input name="submit" type="submit" class="formbtn btn btn-primary" value="<?=gettext("Save");?>"/>
                      </td>
                    </tr>
                  </table>
                </div>
              </form>
            </div>
          </section>

          <section class="col-xs-12">
            <div class="tab-content content-box col-xs-12">
                <div class="table-responsive">
                  <table class="tabcont table table-striped" width="100%" border="0" cellpadding="0" cellspacing="0" summary="static mappings">
                    <tr>
                      <td colspan="4" class="listtopic"><?=gettext("DHCPv6 Static Mappings for this interface.");?></td>
                      <td>&nbsp;</td>
                    </tr>
                    <tr>
                      <td><?=gettext("DUID");?></td>
                      <td><?=gettext("IPv6 address");?></td>
                      <td><?=gettext("Hostname");?></td>
                      <td><?=gettext("Description");?></td>
                      <td>
                        <a href="services_dhcpv6_edit.php?if=<?=$if;?>" class="btn btn-default btn-xs"><span class="glyphicon glyphicon-plus"></span></a>
                      </td>
                    </tr>
<?php
                    if(!empty($config['dhcpdv6'][$if]['staticmap'])):
                      $i = 0;
                      foreach ($config['dhcpdv6'][$if]['staticmap'] as $mapent): ?>
                    <tr>
                      <td><?=htmlspecialchars($mapent['duid']);?></td>
                      <td><?=isset($mapent['ipaddrv6']) ? htmlspecialchars($mapent['ipaddrv6']) : "";?></td>
                      <td><?=htmlspecialchars($mapent['hostname']);?></td>
                      <td><?=htmlspecialchars($mapent['descr']);?></td>
                      <td>
                        <a href="services_dhcpv6_edit.php?if=<?=$if;?>&amp;id=<?=$i;?>" class="btn btn-default btn-xs"><span class="glyphicon glyphicon-pencil"></span></a>
                        <button type="button" data-if="<?=$if;?>" data-id="<?=$i;?>" class="act_delete_static btn btn-xs btn-default"><span class="fa fa-trash text-muted"></span></button>
                      </td>
                    </tr>
<?php
                      $i++;
                      endforeach;
                    endif; ?>
                  </table>
                </div>
<?php
                endif; ?>
              </div>
          </section>
        </div>
      </div>
    </section>
<?php include("foot.inc"); ?>
