<?php

/*
    Copyright (C) 2014-2015 Deciso B.V.
    Copyright (C) 2005 Bill Marquette <bill.marquette@gmail.com>.
    Copyright (C) 2003-2005 Manuel Kasper <mk@neon1.net>.
    Copyright (C) 2004-2005 Scott Ullrich <geekgod@pfsense.com>.
    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("interfaces.inc");
require_once("pfsense-utils.inc");

/**
 * find max vhid
 */
function find_last_used_vhid() {
    global $config;
    $vhid = 0;
    if (isset($config['virtualip']['vip'])) {
        foreach($config['virtualip']['vip'] as $vip) {
            if(!empty($vip['vhid']) && $vip['vhid'] > $vhid) {
                $vhid = $vip['vhid'];
            }
        }
    }
    return $vhid;
}


// create new vip array if none existent
if (!isset($config['virtualip']) || !is_array($config['virtualip'])) {
    $config['virtualip'] = array();
}
if (!isset($config['virtualip']['vip']) || !is_array($config['virtualip']['vip'])) {
    $config['virtualip']['vip'] = array();
}
$a_vip = &$config['virtualip']['vip'];


if ($_SERVER['REQUEST_METHOD'] === 'GET') {
    // input record id, if valid
    if (isset($_GET['dup']) && isset($a_vip[$_GET['dup']]))  {
        $configId = $_GET['dup'];
        $after = $configId;
    } elseif (isset($_GET['id']) && isset($a_vip[$_GET['id']])) {
        $id = $_GET['id'];
        $configId = $id;
    }
    $pconfig = array();
    $pconfig['vhid'] = find_last_used_vhid() + 1;
    $form_fields = array('mode', 'vhid', 'advskew', 'advbase', 'password', 'subnet', 'subnet_bits'
                        , 'descr' ,'type', 'interface' );

    if (isset($configId)) {
        // 1-on-1 copy of config data
        foreach ($form_fields as $fieldname) {
            if (isset($a_vip[$configId][$fieldname])) {
                $pconfig[$fieldname] = $a_vip[$configId][$fieldname] ;
            }
        }
    }

    // initialize empty form fields
    foreach ($form_fields as $fieldname) {
        if (!isset($pconfig[$fieldname])) {
            $pconfig[$fieldname] = null ;
        }
    }
}  elseif ($_SERVER['REQUEST_METHOD'] === 'POST') {
    $input_errors = array();
    $pconfig = $_POST;

    // input record id, if valid
    if (isset($pconfig['id']) && isset($a_vip[$pconfig['id']])) {
        $id = $pconfig['id'];
    }

    // perform form validations
    $reqdfields = array("mode");
    $reqdfieldsn = array(gettext("Type"));
    do_input_validation($pconfig, $reqdfields, $reqdfieldsn, $input_errors);

    if (isset($pconfig['subnet'])) {
        $pconfig['subnet'] = trim($pconfig['subnet']);
        if (!is_ipaddr($pconfig['subnet'])) {
            $input_errors[] = gettext("A valid IP address must be specified.");
        } else {
            $ignore_if = isset($id) ? $a_vip[$id]['interface'] : $pconfig['interface'];
            if ($pconfig['mode'] == 'carp') {
                $ignore_if .= "_vip{$pconfig['vhid']}";
            }
            if (is_ipaddr_configured($pconfig['subnet'], $ignore_if)) {
                $input_errors[] = gettext("This IP address is being used by another interface or VIP.");
            }
        }
    }
    $natiflist = get_configured_interface_with_descr();
    foreach ($natiflist as $natif => $natdescr) {
        if ($pconfig['interface'] == $natif && (empty($config['interfaces'][$natif]['ipaddr']) && empty($config['interfaces'][$natif]['ipaddrv6']))) {
            $input_errors[] = gettext("The interface chosen for the VIP has no IPv4 or IPv6 address configured so it cannot be used as a parent for the VIP.");
        }
    }
    /* ipalias and carp should not use network or broadcast address */
    if ($pconfig['mode'] == "ipalias" || $pconfig['mode'] == "carp") {
        if (is_ipaddrv4($pconfig['subnet']) && $pconfig['subnet_bits'] != "32") {
            $network_addr = gen_subnet($pconfig['subnet'], $pconfig['subnet_bits']);
            $broadcast_addr = gen_subnet_max($pconfig['subnet'], $pconfig['subnet_bits']);
        } else if (is_ipaddrv6($pconfig['subnet']) && $_POST['subnet_bits'] != "128" ) {
            $network_addr = gen_subnetv6($pconfig['subnet'], $pconfig['subnet_bits']);
            $broadcast_addr = gen_subnetv6_max($pconfig['subnet'], $pconfig['subnet_bits']);
        }
        if (isset($network_addr) && $pconfig['subnet'] == $network_addr) {
            $input_errors[] = gettext("You cannot use the network address for this VIP");
        } else if (isset($broadcast_addr) && $pconfig['subnet'] == $broadcast_addr) {
            $input_errors[] = gettext("You cannot use the broadcast address for this VIP");
        }
    }

    /* make sure new ip is within the subnet of a valid ip
     * on one of our interfaces (wan, lan optX)
     */
    if ($pconfig['mode'] == 'carp') {
        /* verify against reusage of vhids */
        foreach($config['virtualip']['vip'] as $vipId => $vip) {
          if(isset($vip['vhid']) &&  $vip['vhid'] == $pconfig['vhid'] && $vip['interface'] == $pconfig['interface'] && $vipId <> $id) {
              $input_errors[] = sprintf(gettext("VHID %s is already in use on interface %s. Pick a unique number on this interface."),$pconfig['vhid'], convert_friendly_interface_to_friendly_descr($pconfig['interface']));
          }
        }
        if (empty($pconfig['password'])) {
            $input_errors[] = gettext("You must specify a CARP password that is shared between the two VHID members.");
        }

        if (is_ipaddrv4($pconfig['subnet'])) {
            $parent_ip = get_interface_ip($pconfig['interface']);
            $parent_sn = get_interface_subnet($pconfig['interface']);
            $subnet = gen_subnet($parent_ip, $parent_sn);
        } else if (is_ipaddrv6($pconfig['subnet'])) {
            $parent_ip = get_interface_ipv6($pconfig['interface']);
            $parent_sn = get_interface_subnetv6($pconfig['interface']);
            $subnet = gen_subnetv6($parent_ip, $parent_sn);
        }

        if (isset($parent_ip) && !ip_in_subnet($pconfig['subnet'], "{$subnet}/{$parent_sn}") && !ip_in_interface_alias_subnet($pconfig['interface'], $pconfig['subnet'])) {
            $cannot_find = $pconfig['subnet'] . "/" . $pconfig['subnet_bits'] ;
            $input_errors[] = sprintf(gettext("Sorry, we could not locate an interface with a matching subnet for %s.  Please add an IP alias in this subnet on this interface."),$cannot_find);
        }

        if ($pconfig['interface'] == "lo0") {
            $input_errors[] = gettext("For this type of vip localhost is not allowed.");
        }
    } else if ($pconfig['mode'] != 'ipalias' && $pconfig['interface'] == "lo0") {
        $input_errors[] = gettext("For this type of vip localhost is not allowed.");
    }


    if (count($input_errors) == 0) {
        $vipent = array();
        // defaults
        $vipent['type'] = "single";
        $vipent['subnet_bits'] = "32";
        // 1-on-1 copy attributes
        foreach (array('mode', 'interface', 'descr', 'type', 'subnet_bits', 'subnet', 'vhid'
                      ,'advskew','advbase','password') as $fieldname) {
            if (isset($pconfig[$fieldname]) && $pconfig[$fieldname] != "") {
                $vipent[$fieldname] = $pconfig[$fieldname];
            }
        }

        if (!empty($pconfig['noexpand'])) {
            // noexpand, only used for proxyarp
            $vipent['noexpand'] = true;
        }

        // virtual ip UI keeps track of it's changes in a separate file
        // (which is only use on apply in firewall_virtual_ip)
        // add or change this administration here.
        // Not the nicest thing to do, but we keep it for now.
        if (file_exists('/tmp/.firewall_virtual_ip.apply')) {
            $toapplylist = unserialize(file_get_contents('/tmp/.firewall_virtual_ip.apply'));
        } else {
            $toapplylist = array();
        }
        if (isset($id)) {
            // save existing content before changing it
            $toapplylist[$id] = $a_vip[$id];
        } else {
            // new entry, no old data
            $toapplylist[count($a_vip)] = array();
        }

        if (isset($id)) {
            /* modify all virtual IP rules with this address */
            for ($i = 0; isset($config['nat']['rule'][$i]); $i++) {
                if (isset($config['nat']['rule'][$i]['destination']['address']) && $config['nat']['rule'][$i]['destination']['address'] == $a_vip[$id]['subnet']) {
                    $config['nat']['rule'][$i]['destination']['address'] = $vipent['subnet'];
                }
            }
        }

        // update or insert item in config
        if (isset($id)) {
            $a_vip[$id] = $vipent;
        } else {
            $a_vip[] = $vipent;
        }
        if (write_config()) {
            mark_subsystem_dirty('vip');
            file_put_contents('/tmp/.firewall_virtual_ip.apply', serialize($toapplylist));
        }
        header("Location: firewall_virtual_ip.php");
        exit;
    }
}

legacy_html_escape_form_data($pconfig);

include("head.inc");

?>

<body>

<?php include("fbegin.inc");?>

<script type="text/javascript">
$( document ).ready(function() {
    $("#mode").change(function(){
        //$("#subnet").attr('disabled', true);
        $("#type").attr('disabled', true);
        $("#subnet_bits").attr('disabled', true);
        $("#noexpand").attr('disabled', true);
        $("#password").attr('disabled', true);
        $("#vhid").attr('disabled', true);
        $("#advskew").attr('disabled', true);
        $("#advbase").attr('disabled', true);
        $("#noexpand").attr('disabled', true);
        $("#noexpandrow").addClass("hidden");

        switch ($(this).val()) {
            case "ipalias":
              $("#type").prop("selectedIndex",0);
              $("#subnet_bits").attr('disabled', false);
              $("#typenote").html("<?=gettext("Please provide a single IP address.");?>");
              break;
            case "carp":
              $("#type").prop("selectedIndex",0);
              $("#subnet_bits").attr('disabled', false);
              $("#password").attr('disabled', false);
              $("#vhid").attr('disabled', false);
              $("#advskew").attr('disabled', false);
              $("#advbase").attr('disabled', false);
              $("#typenote").html("<?=gettext("This must be the network's subnet mask. It does not specify a CIDR range.");?>");
              break;
            case "proxyarp":
              $("#type").attr('disabled', false);
              $("#subnet_bits").attr('disabled', false);
              $("#noexpand").attr('disabled', false);
              $("#noexpandrow").removeClass("hidden");
              $("#typenote").html("<?=gettext("This is a CIDR block of proxy ARP addresses.");?>");
              break;
            case "other":
              $("#type").attr('disabled', false);
              $("#subnet_bits").attr('disabled', false);
              $("#typenote").html("<?=gettext("This must be the network's subnet mask. It does not specify a CIDR range.");?>");
              break;
        }
        // refresh selectpickers
        setTimeout(function(){
            $('.selectpicker').selectpicker('refresh');
          }, 100);
    });

    // toggle initial mode change
    $("#mode").change();

    // IPv4/IPv6 select
    hook_ipv4v6('ipv4v6net', 'network-id');
});

</script>

</script>
  <section class="page-content-main">
    <div class="container-fluid">
      <div class="row">
        <?php if (isset($input_errors) && count($input_errors) > 0) print_input_errors($input_errors); ?>
        <section class="col-xs-12">
          <div class="content-box tab-content">
            <form action="firewall_virtual_ip_edit.php" method="post" name="iform" id="iform">
              <table class="table table-striped">
                <thead></thead>
                <tbody>
                  <tr>
                    <td width="22%"><strong><?=gettext("Edit Virtual IP");?></strong></td>
                    <td  width="78%" align="right">
                      <small><?=gettext("full help"); ?> </small>
                      <i class="fa fa-toggle-off text-danger"  style="cursor: pointer;" id="show_all_help_page" type="button"></i>
                    </td>
                  </tr>
                  <tr>
                    <td><a id="help_for_mode" href="#" class="showhelp"><i class="fa fa-info-circle"></i></a> <?=gettext('Type');?></td>
                    <td>
                      <select id="mode" name="mode" class="selectpicker" data-width="auto" data-live-search="true">
                        <option value="ipalias" <?=$pconfig['mode'] == "ipalias" ? "selected=\"selected\"" : ""; ?>><?=gettext("IP Alias");?></option>
                        <option value="carp" <?=$pconfig['mode'] == "carp" ? "selected=\"selected\"" : ""; ?>><?=gettext("carp");?></option>
                        <option value="proxyarp" <?=$pconfig['mode'] == "proxyarp" ? "selected=\"selected\"" : ""; ?>><?=gettext("Proxy ARP");?></option>
                        <option value="other" <?=$pconfig['mode'] == "other" ? "selected=\"selected\"" : ""; ?>><?=gettext("Other");?></option>
                      </select>
                      <div class="hidden" for="help_for_mode">
                        <?=gettext("Proxy ARP and other type Virtual IPs cannot be bound to by anything running on the firewall, such as IPsec, OpenVPN, etc. Use a CARP or IP Alias type address for these cases.");?>
                      </div>
                    </td>
                  </tr>
                  <tr>
                    <td><i class="fa fa-info-circle text-muted"></i> <?=gettext("Interface");?></td>
                    <td>
                      <select name="interface" class="selectpicker" data-width="auto">
<?php
                      $interfaces = get_configured_interface_with_descr(false, true);
                      $interfaces['lo0'] = "Localhost";
                      foreach ($interfaces as $iface => $ifacename): ?>
                        <option value="<?=$iface;?>" <?= $iface == $pconfig['interface'] ? "selected=\"selected\"" :""; ?>>
                          <?=htmlspecialchars($ifacename);?>
                        </option>
<?php
                      endforeach; ?>
                      </select>
                    </td>
                  </tr>
                  <tr>
                      <td><?=gettext("IP Address(es)");?></td>
                      <td></td>
                  </tr>
                  <tr>
                      <td><i class="fa fa-info-circle text-muted"></i> <?=gettext("Type");?></td>
                      <td>
                        <select name="type" class="selectpicker" data-width="auto" id="type">
                            <option value="single" <?=(!empty($pconfig['subnet_bits']) && $pconfig['subnet_bits'] == 32) || !isset($pconfig['subnet']) ? "selected=\"selected\"" : "";?>>
                              <?=gettext("Single address");?>
                            </option>
                            <option value="network" <?=empty($pconfig['subnet_bits']) || $pconfig['subnet_bits'] != 32 || isset($pconfig['subnet']) ? "selected=\"selected\"" : "";?>>
                              <?=gettext("Network");?></option>
                            </select>
                      </td>
                  </tr>
                  <tr>
                      <td><a id="help_for_address" href="#" class="showhelp"><i class="fa fa-info-circle"></i></a> <?=gettext("Address");?></td>
                      <td>
                        <table border="0" cellspacing="0" cellpadding="0">
                          <tr>
                            <td width="348px">
                              <input name="subnet" type="text" class="form-control" id="subnet" size="28" value="<?=$pconfig['subnet'];?>" />
                            </td>
                            <td >
                              <select name="subnet_bits" data-network-id="subnet" class="selectpicker ipv4v6net" data-size="10"  data-width="auto" id="subnet_bits">
                                <option disabled="disabled"></option> <!-- workaround for selectpicker -->
<?php
                                for ($i = 128; $i >= 1; $i--): ?>
                                  <option value="<?=$i;?>" <?= $i == $pconfig['subnet_bits'] ? "selected=\"selected\"" :""; ?>>
                                    <?=$i;?>
                                  </option>
<?php
                                endfor; ?>
                              </select>
                            </td>
                          </tr>
                        </table>
                        <div class="hidden" for="help_for_address">
                            <i id="typenote"></i>
                        </div>
                      </td>
                  </tr>
                  <tr id="noexpandrow">
                      <td><a id="help_for_noexpand" href="#" class="showhelp"><i class="fa fa-info-circle"></i></a> <?=gettext("Expansion");?> </td>
                      <td>
                          <input id="noexpand" name="noexpand" type="checkbox" class="form-control unknown" id="noexpand" <?= !empty($pconfig['noexpand']) ? "checked=\"checked\"" : "" ; ?> />
                          <div class="hidden" for="help_for_noexpand">
                            <?=gettext("Disable expansion of this entry into IPs on NAT lists (e.g. 192.168.1.0/24 expands to 256 entries.");?>
                          </div>
                  </tr>
                  <tr>
                    <td><a id="help_for_password" href="#" class="showhelp"><i class="fa fa-info-circle"></i></a> <?=gettext("Virtual IP Password");?></td>
                    <td>
                      <input type='password'  name='password' id="password" value="<?=$pconfig['password'];?>" />
                      <div class="hidden" for="help_for_password">
                        <?=gettext("Enter the VHID group password.");?>
                      </div>
                    </td>
                  </tr>
                  <tr>
                    <td><a id="help_for_vhid" href="#" class="showhelp"><i class="fa fa-info-circle"></i></a> <?=gettext("VHID Group");?></td>
                    <td>
                      <select id='vhid' name='vhid' class="selectpicker" data-size="10" data-width="auto">
                        <?php for ($i = 1; $i <= 255; $i++): ?>
                          <option value="<?=$i;?>" <?= $i == $pconfig['vhid'] ?  "selected=\"selected\"" : ""; ?>>
                            <?=$i;?>
                          </option>
                        <?php endfor; ?>
                      </select>
                      <div class="hidden" for="help_for_vhid">
                        <?=gettext("Enter the VHID group that the machines will share.");?>
                      </div>
                    </td>
                  </tr>
                  <tr>
                    <td><a id="help_for_adv" href="#" class="showhelp"><i class="fa fa-info-circle"></i></a> <?=gettext("Advertising Frequency");?></td>
                    <td>
                      <?=gettext("Base");?>:
                      <select id='advbase' name='advbase' class="selectpicker" data-size="10" data-width="auto">
                        <?php for ($i = 1; $i <= 254; $i++): ?>
                          <option value="<?=$i;?>" <?=$i == $pconfig['advbase'] ? "selected=\"selected\"" :""; ?>>
                            <?=$i;?>
                          </option>
                        <?php endfor; ?>
                      </select>
                      <?=gettext("Skew");?>:
                      <select id='advskew' name='advskew' class="selectpicker" data-size="10" data-width="auto">
                        <?php for ($i = 0; $i <= 254; $i++): ?>
                          <option value="<?=$i;?>" <?php if ($i == $pconfig['advskew']) echo "selected=\"selected\""; ?>>
                            <?=$i;?>
                          </option>
                        <?php endfor; ?>
                      </select>

                      <div class="hidden" for="help_for_adv">
                        <br/>
                        <?=gettext("The frequency that this machine will advertise.  0 usually means master. Otherwise the lowest combination of both values in the cluster determines the master.");?>
                      </div>
                    </td>
                  </tr>
                  <tr>
                    <td><a id="help_for_descr" href="#" class="showhelp"><i class="fa fa-info-circle"></i></a> <?=gettext("Description");?></td>
                    <td>
                      <input name="descr" type="text" class="form-control unknown" id="descr" size="40" value="<?=$pconfig['descr'];?>" />
                      <div class="hidden" for="help_for_adv">
                        <?=gettext("You may enter a description here for your reference (not parsed).");?>
                      </div>
                    </td>
                  </tr>
                  <tr>
                    <td>&nbsp;</td>
                    <td>
                      <input name="Submit" type="submit" class="btn btn-primary" value="<?=gettext("Save"); ?>" />
                      <input type="button" class="btn btn-default" value="<?=gettext("Cancel");?>" onclick="window.location.href='<?=(isset($_SERVER['HTTP_REFERER']) ? $_SERVER['HTTP_REFERER'] : '/firewall_virtual_ip.php');?>'" />
                      <?php if (isset($id) && $a_vip[$id]): ?>
                        <input name="id" type="hidden" value="<?=$id;?>" />
                      <?php endif; ?>
                    </td>
                  </tr>
                </tbody>
              </table>
            </form>
          </div>
        </section>
      </div>
    </div>
  </section>
<?php include("foot.inc"); ?>
