H1502_website/network.php

<?php include('partialpage/header.php');?>
<?php include('partialpage/sidebar.php');?>

<script>
$(document).ready(function() {
  checkdhcp();
  $("#dhcp, #static").change(function () {
    checkdhcp();
  });
});

function checkdhcp(){
  if ($("#static").is(":checked")) {
    $("#ipaddress").removeAttr("disabled");
    $("#subnet").removeAttr("disabled");
    $("#gateway").removeAttr("disabled");
    $("#primarydns").removeAttr("disabled");
    $("#secondarydns").removeAttr("disabled");
  }
  if ($("#dhcp").is(":checked")) {
    $("#ipaddress").attr("disabled", "disabled");
    $("#subnet").attr("disabled", "disabled");
    $("#gateway").attr("disabled", "disabled");
    $("#primarydns").attr("disabled", "disabled");
    $("#secondarydns").attr("disabled", "disabled");
  }
}
</script>

<?php
  $path = '/etc/network/interfaces';

  function clearnetworksettings($filename) {
    if (file_exists($filename)){
      if (!is_writable($filename)) {
        $command = "sudo chmod 666 $filename";
        exec($command);
      }
      $data = file_get_contents($filename);
      $replace_match = '/^.*(?:address|netmask|gateway|dns-nameservers).*$(?:\r\n|\n)?/m';
      $data = preg_replace($replace_match, '', $data);
      file_put_contents($filename, $data);
    }
  }

  if($_SERVER['REQUEST_METHOD'] == 'POST' ){
    clearnetworksettings($path);

    if ($_POST['network'] == 'dhcp'){
      shell_exec("sudo sed -i 's/static/dhcp/' /etc/network/interfaces");
      shell_exec("sudo /etc/init.d/./S45ifplugd restart");
      $message = "Network set to dhcp";
    }
    if ($_POST['network'] == 'static'){
      shell_exec("sudo sed -i 's/dhcp/static/' /etc/network/interfaces");

      if (file_exists($path)){
        if (!is_writable($path)) {
          $command = "sudo chmod 666 $path";
          exec($command);
        }
        $fp = fopen($path, 'a');
        if(!$fp){
          echo 'file is not opend';
        }
        fwrite($fp, "  address " .$_POST['ipaddress'] .PHP_EOL);
        fwrite($fp, "  netmask " .$_POST['subnet'] .PHP_EOL);
        fwrite($fp, "  gateway " .$_POST['gateway'] .PHP_EOL);
        fwrite($fp, "  dns-nameservers " .$_POST['primarydns'] .PHP_EOL);
        fwrite($fp, "  dns-nameservers " .$_POST['secondarydns'] .PHP_EOL);
        fclose($fp);
      }

      shell_exec("sudo /etc/init.d/./S45ifplugd restart");
      $message = "Network set to static";
    }
  }else{
    //$message = "get";
  };

  $interface = shell_exec('cat /etc/network/interfaces');
  $dhcp = false;
  if (strpos($interface, 'dhcp') !== false) {
    $dhcp = true;
  }

  $ipaddress = shell_exec("ifconfig eth0 | grep 'inet addr' | cut -d':' -f2 | cut -d' ' -f1");
  $subnet = shell_exec("ifconfig eth0 | grep 'Mask' | cut -d':' -f4");
  $gateway = shell_exec("route | grep 'default' | awk {'print $2'}");
  $primarydns = shell_exec("cat /etc/resolv.conf | grep 'nameserver' | head -n 1 | cut -d' ' -f2");
  $secondarydns = shell_exec("cat /etc/resolv.conf | grep 'nameserver' | head -n 2 | tail -n 1 | cut -d' ' -f2");
?>

<!-- !PAGE CONTENT! -->
<div class="w3-main" style="margin-left:340px;margin-right:40px">

  <!-- Header -->
  <div class="w3-container" style="margin-top:80px" id="showcase">
    <h1 class="w3-jumbo"><b>Network</b></h1>
    <br>
    <div style="border:5px solid red; width:100px" class="w3-round"></div>
    <br>
  </div>

  <?php if(isset($message)){
    echo "<!-- post result messages -->";
    echo "<div class='w3-container' id='resultmessage' style='margin-top:75px'>";
    echo "<p>$message</p>";
    echo "</div>";
  };?>

  <p>Network  configuration.</p>
  <div class="w3-row">
    <div class="w3-col l6">
      <form action="network.php" method="POST">
        <div class="w3-section">
          <input class="w3-radio" type="radio" name="network" value="dhcp" id="dhcp" <?php if($dhcp){echo 'checked';}?>>
          <label>Use DHCP</label>
        </div>
        <div class="w3-section">
          <input class="w3-radio" type="radio" name="network" value="static" id="static" <?php if(!$dhcp){echo 'checked';}?>>
          <label>Use static IP settings</label>
        </div>

      <div class="w3-section">
        <label class="w3-label">IP address</label>
        <input class="w3-input w3-border" type="text" name="ipaddress" id="ipaddress" value="<?php echo $ipaddress ?>" required>
      </div>
      <div class="w3-section">
        <label class="w3-label">Subnet mask</label>
        <input class="w3-input w3-border" type="text" name="subnet" id="subnet" value="<?php echo $subnet ?>" required>
      </div>
      <div class="w3-section">
        <label class="w3-label">Gateway</label>
        <input class="w3-input w3-border" type="text" name="gateway" id="gateway" value="<?php echo $gateway ?>" required>
      </div>
      <div class="w3-section">
        <label class="w3-label">Primary DNS server</label>
        <input class="w3-input w3-border" type="text" name="primarydns" id="primarydns" value="<?php echo $primarydns ?>" required>
      </div>
      <div class="w3-section">
        <label class="w3-label">Secondary DNS server</label>
        <input class="w3-input w3-border" type="text" name="secondarydns" id="secondarydns" value="<?php echo $secondarydns ?>" required>
      </div>

      <button type="submit" class="w3-button w3-block w3-padding-large w3-red w3-margin-bottom">Change network settings</button>
      </form>
    </div>
  </div>

<!-- End page content -->
</div>

<?php include('partialpage/footer.php');?>