<?php

/*
    Copyright (C) 2014-2015 Deciso B.V.
    Copyright (C) 2008 Ermal Luçi
    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("system.inc");
require_once("interfaces.inc");
require_once("pfsense-utils.inc");
require_once("openvpn.inc");
require_once("unbound.inc");
require_once("services.inc");

if (!isset($config['gifs']) || !is_array($config['gifs'])) {
    $config['gifs'] = array();
}
if (!isset($config['gifs']['gif']) || !is_array($config['gifs']['gif'])) {
    $config['gifs']['gif'] = array();
}
$a_gifs = &$config['gifs']['gif'];


if ($_SERVER['REQUEST_METHOD'] === 'GET') {
    // read form data
    if (!empty($a_gifs[$_GET['id']])) {
        $id = $_GET['id'];
    }
    $pconfig = array();

    // copy fields
    $copy_fields = array('gifif', 'remote-addr', 'tunnel-remote-net', 'tunnel-local-addr', 'tunnel-remote-addr', 'descr');
    foreach ($copy_fields as $fieldname) {
        $pconfig[$fieldname] = isset($a_gifs[$id][$fieldname]) ? $a_gifs[$id][$fieldname] : null;
    }
    // bool fields
    $pconfig['link0'] = isset($a_gifs[$id]['link0']);
    $pconfig['link1'] = isset($a_gifs[$id]['link1']);

    // construct interface
    if (!empty($a_gifs[$id]['ipaddr'])) {
        $pconfig['if'] = $pconfig['if'] . '|' . $a_gifs[$id]['ipaddr'];
    } elseif (!empty($a_gifs[$id]['if'])) {
        $pconfig['if'] = $a_gifs[$id]['if'];
    } else {
        $pconfig['if'] = null;
    }
} elseif ($_SERVER['REQUEST_METHOD'] === 'POST') {
    // validate and save form data
    if (!empty($a_gifs[$_POST['id']])) {
        $id = $_POST['id'];
    }

    $input_errors = array();
    $pconfig = $_POST;

    /* input validation */
    $reqdfields = explode(" ", "if tunnel-remote-addr tunnel-remote-net tunnel-local-addr");
    $reqdfieldsn = array(gettext("Parent interface,Local address, Remote tunnel address, Remote tunnel network, Local tunnel address"));

    do_input_validation($pconfig, $reqdfields, $reqdfieldsn, $input_errors);

    if (!is_ipaddr($pconfig['tunnel-local-addr']) || !is_ipaddr($pconfig['tunnel-remote-addr']) || !is_ipaddr($pconfig['remote-addr'])) {
        $input_errors[] = gettext("The tunnel local and tunnel remote fields must have valid IP addresses.");
    }

    $alias = strstr($pconfig['if'],'|');
    if ((is_ipaddrv4($alias) && !is_ipaddrv4($pconfig['remote-addr'])) ||
        (is_ipaddrv6($alias) && !is_ipaddrv6($pconfig['remote-addr']))
    ) {
        $input_errors[] = gettext("The alias IP address family has to match the family of the remote peer address.");
    }

    foreach ($a_gifs as $gif) {
        if (isset($id) && $a_gifs[$id] === $gif) {
            continue;
        }
        /* FIXME: needs to perform proper subnet checks in the feature */
        if ($gif['if'] == $interface && $gif['tunnel-remote-addr'] == $pconfig['tunnel-remote-addr']) {
            $input_errors[] = sprintf(gettext("A gif with the network %s is already defined."), $gif['tunnel-remote-addr']);
            break;
        }
    }

    if (count($input_errors) == 0) {
        $gif = array();
        // copy fields
        $copy_fields = array('tunnel-local-addr', 'tunnel-remote-addr', 'tunnel-remote-net', 'remote-addr', 'descr', 'gifif');
        foreach ($copy_fields as $fieldname) {
            $gif[$fieldname] = $pconfig[$fieldname];
        }
        // bool fields
        $gif['link1'] = !empty($pconfig['link1']);
        $gif['link0'] = !empty($pconfig['link0']);

        // interface and optional bind address
        if (strpos($pconfig['if'], '|') !== false) {
            list($gif['if'], $gif['ipaddr']) = explode("|",$pconfig['if']);
        } else {
            $gif['if'] = $pconfig['if'];
            $gif['ipaddr'] = null;
        }

        $gif['gifif'] = interface_gif_configure($gif);
        if ($gif['gifif'] == "" || !stristr($gif['gifif'], "gif")) {
            $input_errors[] = gettext("Error occurred creating interface, please retry.");
        } else {
            if (isset($id)) {
                $a_gifs[$id] = $gif;
            } else {
                $a_gifs[] = $gif;
            }
            write_config();
            $confif = convert_real_interface_to_friendly_interface_name($gif['gifif']);
            if ($confif <> "") {
                interface_configure($confif);
            }
            header("Location: interfaces_gif.php");
            exit;
        }
    }
}

legacy_html_escape_form_data($pconfig);
include("head.inc");
?>

<body>
<script type="text/javascript">
  $( document ).ready(function() {
    hook_ipv4v6('ipv4v6net', 'network-id');
  });
</script>
<?php include("fbegin.inc"); ?>
<section class="page-content-main">
  <div class="container-fluid">
    <div class="row">
      <?php if (isset($input_errors) && count($input_errors) > 0) print_input_errors($input_errors); ?>
      <section class="col-xs-12">
        <div class="content-box">
          <div class="table-responsive">
            <form method="post" name="iform" id="iform">
              <table class="table table-striped">
                <thead>
                  <tr>
                    <td width="22%"><strong><?=gettext("GIF configuration");?></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>
                      &nbsp;
                    </td>
                  </tr>
                </thead>
                <tbody>
                  <tr>
                    <td width="22%"><a id="help_for_if" href="#" class="showhelp"><i class="fa fa-info-circle"></i></a> <?=gettext("Parent interface"); ?></td>
                    <td width="78%">
                      <select name="if" class="selectpicker" data-live-search="true">
<?php
                      $portlist = get_configured_interface_with_descr();
                      $carplist = get_configured_carp_interface_list();
                      $aliaslist = get_configured_ip_aliases_list();
                      foreach ($carplist as $cif => $carpip) {
                          $portlist[$cif] = $carpip." (".get_vip_descr($carpip).")";
                      }
                      foreach ($aliaslist as $aliasip => $aliasif) {
                          $portlist[$aliasif.'|'.$aliasip] = $aliasip." (".get_vip_descr($aliasip).")";
                      }
                      foreach ($portlist as $ifn => $ifinfo):?>
                        <option value="<?=$ifn;?>" <?=$ifn == $pconfig['if'] ? "selected=\"selected\"" : "";?>>
                            <?=htmlspecialchars($ifinfo);?>
                        </option>
<?php
                      endforeach;?>
                      </select>
                      <div class="hidden" for="help_for_if">
                        <?=gettext("The interface here serves as the local address to be used for the gif tunnel."); ?>
                      </div>
                    </td>
                  </tr>
                  <tr>
                    <td><a id="help_for_remote-addr" href="#" class="showhelp"><i class="fa fa-info-circle"></i></a> <?=gettext("GIF remote address"); ?></td>
                    <td>
                      <input name="remote-addr" type="text" value="<?=$pconfig['remote-addr'];?>" />
                      <div class="hidden" for="help_for_remote-addr">
                        <?=gettext("Peer address where encapsulated gif packets will be sent. "); ?>
                      </div>
                    </td>
                  </tr>
                  <tr>
                    <td><a id="help_for_tunnel-local-addr" href="#" class="showhelp"><i class="fa fa-info-circle"></i></a> <?=gettext("GIF tunnel local address"); ?></td>
                    <td>
                      <input name="tunnel-local-addr" type="text" value="<?=$pconfig['tunnel-local-addr'];?>" />
                      <div class="hidden" for="help_for_tunnel-local-addr">
                        <?=gettext("Local gif tunnel endpoint"); ?>
                      </div>
                    </td>
                  </tr>
                  <tr>
                    <td><a id="help_for_tunnel-remote-addr" href="#" class="showhelp"><i class="fa fa-info-circle"></i></a> <?=gettext("GIF tunnel remote address "); ?></td>
                    <td>
                      <table class="table table-condensed">
                        <tr>
                          <td width="285px">
                            <input name="tunnel-remote-addr" type="text" id="tunnel-remote-addr" value="<?=$pconfig['tunnel-remote-addr'];?>" />
                          </td>
                          <td>
                            <select name="tunnel-remote-net" data-network-id="tunnel-remote-addr" class="selectpicker ipv4v6net" data-size="10" id="tunnel-remote-net" data-width="auto">
<?php
                            for ($i = 128; $i > 0; $i--):?>
                              <option value="<?=$i;?>"  <?=$i == $pconfig['tunnel-remote-net'] ? "selected=\"selected\"" : "";?> >
                                  <?=$i;?>
                              </option>
<?php
                            endfor;?>
                            </select>
                          </td>
                        </tr>
                      </table>
                      <div class="hidden" for="help_for_tunnel-remote-addr">
                        <?=gettext("Remote gif address endpoint. The subnet part is used for determining the network that is tunnelled."); ?>
                      </div>
                    </td>
                  </tr>
                  <tr>
                    <td><a id="help_for_link0" href="#" class="showhelp"><i class="fa fa-info-circle"></i></a> <?=gettext("Route caching  "); ?></td>
                    <td>
                      <input name="link0" type="checkbox" id="link0" <?=!empty($pconfig['link0']) ? "checked=\"checked\"" :"";?> />
                      <div class="hidden" for="help_for_link0">
                        <?=gettext("Specify if route caching can be enabled. Be careful with these settings on dynamic networks. "); ?>
                      </div>
                    </td>
                  </tr>
                  <tr>
                    <td><a id="help_for_link1" href="#" class="showhelp"><i class="fa fa-info-circle"></i></a> <?=gettext("ECN friendly behavior"); ?></td>
                    <td>
                      <input name="link1" type="checkbox" id="link1" <?=!empty($pconfig['link1']) ? "checked=\"checked\"" : "";?> />
                      <div class="hidden" for="help_for_link1">
                        <?=gettext("Note that the ECN friendly behavior violates RFC2893.  This should be " .
                        "used in mutual agreement with the peer."); ?>
                      </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" value="<?=$pconfig['descr'];?>" />
                      <div class="hidden" for="help_for_descr">
                        <?=gettext("You may enter a description here " .
                        "for your reference (not parsed)."); ?>
                      </div>
                    </td>
                  </tr>
                  <tr>
                    <td>&nbsp;</td>
                    <td>
                      <input type="hidden" name="gifif" value="<?=$pconfig['gifif']; ?>" />
                      <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']) ? $_SERVER['HTTP_REFERER'] : '/interfaces_gif.php');?>'" />
                      <?php if (isset($id)): ?>
                      <input name="id" type="hidden" value="<?=htmlspecialchars($id);?>" />
                      <?php endif; ?>
                    </td>
                  </tr>
                </tbody>
              </table>
            </form>
          </div>
        </div>
      </section>
    </div>
  </div>
</section>

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