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<?php
/**
* ---------------------------------------------------------------------
*
* GLPI - Gestionnaire Libre de Parc Informatique
*
* http://glpi-project.org
*
* @copyright 2015-2023 Teclib' and contributors.
* @copyright 2003-2014 by the INDEPNET Development Team.
* @licence https://www.gnu.org/licenses/gpl-3.0.html
*
* ---------------------------------------------------------------------
*
* LICENSE
*
* This file is part of GLPI.
*
* This program 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 3 of the License, or
* (at your option) any later version.
*
* This program 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 this program. If not, see <https://www.gnu.org/licenses/>.
*
* ---------------------------------------------------------------------
*/
/// Class IPNetmask
/// since version 0.84
class IPNetmask extends IPAddress
{
protected static $notable = true;
/**
* @param $ipnetmask (default '')
* @param $version (default 0)
**/
public function __construct($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, $version);
}
}
}
}
public static function getTypeName($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 $version integer =4 or =6 : version of IP protocol
*
* @return false if the netmask is not valid or if it does not correspond to version
**/
public function setNetmaskFromString($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;
}
}