first commit

inc/ipnetmask.class.php

@@ -0,0 +1,133 @@
+<?php
+/**
+ * ---------------------------------------------------------------------
+ * GLPI - Gestionnaire Libre de Parc Informatique
+ * Copyright (C) 2015-2020 Teclib' and contributors.
+ *
+ * http://glpi-project.org
+ *
+ * based on GLPI - Gestionnaire Libre de Parc Informatique
+ * Copyright (C) 2003-2014 by the INDEPNET Development Team.
+ *
+ * ---------------------------------------------------------------------
+ *
+ * LICENSE
+ *
+ * This file is part of GLPI.
+ *
+ * GLPI is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * GLPI is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GLPI. If not, see <http://www.gnu.org/licenses/>.
+ * ---------------------------------------------------------------------
+* */
+
+if (!defined('GLPI_ROOT')) {
+   die("Sorry. You can't access this file directly");
+}
+
+/// Class IPNetmask
+/// since version 0.84
+class IPNetmask extends IPAddress {
+
+   static protected $notable = true;
+
+
+   /**
+    * @param $ipnetmask (default '')
+    * @param $version   (default 0)
+   **/
+   function __construct($ipnetmask = '', $version = 0) {
+
+      // First, be sure that the parent is correctly initialised
+      parent::__construct();
+
+      // If $ipnetmask if empty, then, empty netmask !
+      if ($ipnetmask != '') {
+
+         // If $ipnetmask if an IPNetmask, then just clone it
+         if ($ipnetmask instanceof IPNetmask) {
+            $this->version = $ipnetmask->version;
+            $this->textual = $ipnetmask->textual;
+            $this->binary  = $ipnetmask->binary;
+            $this->fields  = $ipnetmask->fields;
+
+         } else {
+            // Else, check a binary then a string
+            if (!$this->setAddressFromBinary($ipnetmask)) {
+               $this->setNetmaskFromString($ipnetmask, $version);
+            }
+         }
+      }
+   }
+
+
+   static function getTypeName($nb = 0) {
+      return _n('Subnet mask', 'Subnet masks', $nb);
+   }
+
+
+   /**
+    * \brief Create a Netmask from string
+    *
+    * Create a binary Netmask from dot notation (for instance : 255.255.255.0) or
+    * integer (for instance /24). Rely on setAddressFromString()
+    *
+    * @param $netmask   string   netmask defined as textual
+    * @param $version   integer  =4 or =6 : version of IP protocol
+    *
+    * @return false if the netmask is not valid or if it does not correspond to version
+   **/
+   function setNetmaskFromString($netmask, $version) {
+
+      if (is_numeric($netmask)) {
+         if ($netmask < 0) {
+            return false;
+         }
+         // Transform the number of bits to IPv6 netmasks ...
+         $nbBits = $netmask + (($version == 4) ? 96 : 0);
+         if ($nbBits > 128) {
+            return false;
+         }
+         $bits          = str_repeat("1", $nbBits).str_repeat("0", 128 - $nbBits);
+         $this->version = $version;
+         $this->textual = $netmask;
+         $this->binary  = [];
+         for ($i = 0; $i  < 4; $i++) {
+            $localBits      = substr($bits, 32 * $i, 32);
+            $this->binary[] = bindec($localBits);
+         }
+
+      } else {
+         if (!$netmask = $this->setAddressFromString($netmask)) {
+            return false;
+         }
+         if ($version != $this->getVersion()) {
+            return false;
+         }
+         if ($version == 4) {
+            for ($i = 0; $i < 3; $i++) {
+               $this->binary[$i] = 0xffffffff;
+            }
+         }
+      }
+
+      if ($version == 4) {
+         $mask    = decbin($this->binary[3]);
+         $textual = [];
+         for ($i = 0; $i < 4; $i++) {
+            $textual[] = bindec(substr($mask, 8 * $i, 8));
+         }
+         $this->textual = implode(".", $textual);
+      }
+      return true;
+   }
+}