Untitled

<!DOCTYPE html>
<html>
<head><title>Router</title></head>
<body>

<?php
const MAX_ENTRIES=20;
class Proto {
  const IPv4 = 0;
  const IPv6 = 1;
}
function start_tun($fproto, $fip, $fport, $tproto, $tip, $tport) {
  if ($fproto == Proto::IPv6 && $fip[0] != '[') $fip = '[' . $fip . ']';
  if ($tproto == Proto::IPv6 && $tip[0] != '[') $tip = '[' . $tip . ']';

  $cmd = '/usr/bin/socat ';
  $arg1 = '';
  $arg2 = '';
  if ($fproto == Proto::IPv4)
    $arg1 .= 'TCP-LISTEN:';
  else
    $arg1 .= 'TCP6-LISTEN:';
  $arg1 .= $fport . ',fork,bind=' . $fip;

  if ($tproto == Proto::IPv4)
    $arg2 .= 'TCP:';
  else
    $arg2 .= 'TCP6:';
  $arg2 .= $tip.':' . $tport;

  $cmd .= escapeshellarg($arg1) . ' ' . escapeshellarg($arg2) . ' > /dev/null 2>&1 & echo $!';

  $pid = exec($cmd);
  return $pid;
}

function kill_tuns() {
  $pids = file_get_contents("pids.txt");
  $pids = explode(',', $pids);
  foreach ($pids as $pid) {
    $pid = trim($pid);
    if ($pid != '' && $pid != '0') {
      posix_kill((int)$pid, 15);
    }
  }
}

function apply_all_rules() {
  $pids = '';
  $rules = '';
  for ($i = 0; $i < MAX_ENTRIES; $i++) {
    $fproto = ($_POST['fproto'.$i] == 'IPv4' ? Proto::IPv4 : Proto::IPv6);
    $fip = $_POST['fip'.$i];
    $fport = $_POST['fport'.$i];
    $tproto = ($_POST['tproto'.$i] == 'IPv4' ? Proto::IPv4 : Proto::IPv6);
    $tip = $_POST['tip'.$i];
    $tport = $_POST['tport'.$i];
    if ($fip == '' || $fport == '' || $tip == '' || $tport == '') continue;
    $pids .= start_tun($fproto, $fip, $fport, $tproto, $tip, $tport) . ',';
    $rules .= $fproto.",$fip,$fport,".$tproto.",$tip,$tport\n";
  }
  file_put_contents("pids.txt", $pids);
  file_put_contents("rules.txt", $rules);
}

if (isset($_POST['submit'])) {
  kill_tuns();
  apply_all_rules();
}

$rulestxt = explode("\n", file_get_contents('rules.txt'));
$rules = array();
for ($i = 0; $i < MAX_ENTRIES; $i++) {
  if ($i < count($rulestxt)) {
    $curr = explode(',', $rulestxt[$i]);
    if (count($curr) == 6) {
      $curr[0] = ($curr[0] == '0' ? Proto::IPv4 : Proto::IPv6);
      $curr[3] = ($curr[3] == '0' ? Proto::IPv4 : Proto::IPv6);
      $rules[$i] = $curr;
      continue;
    }
  }
  $rules[$i] = array(Proto::IPv4, '', '', Proto::IPv4, '', '');
}
?>


<center>
<form id="forwards" method="post">
<table border="1">
<tr><td colspan="3">FROM</td><td colspan="3">TO</td></tr>
<tr><td>Proto</td><td>Address</td><td>Port</td><td>Proto</td><td>Address</td><td>Port</td></tr>
<?php
for ($i = 0; $i < MAX_ENTRIES; $i++) {
  echo '<tr>
    <td><select name="fproto'.$i.'"><option>IPv4</option><option'.
                                    (($rules[$i][0] == Proto::IPv6) ? ' selected="selected"' : '') .'>IPv6</option></select></td>
    <td><input type="text" name="fip'.$i.'" value="'.$rules[$i][1].'" style="width:300px"></td>
    <td><input type="text" name="fport'.$i.'" value="'.$rules[$i][2].'" style="width:40px"></td>
    <td><select name="tproto'.$i.'"><option>IPv4</option><option'.
                                    (($rules[$i][3] == Proto::IPv6) ? ' selected="selected"' : '') .'>IPv6</option></select></td>
    <td><input type="text" name="tip'.$i.'" value="'.$rules[$i][4].'" style="width:300px"></td>
    <td><input type="text" name="tport'.$i.'" value="'.$rules[$i][5].'" style="width:40px"></td>
  </tr>';
}
?>
</table>
<input type="submit" name="submit" value="Save">
</form>
</center>
</body>
</html>