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<?php |
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/** |
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* Copyright 2015 François Kooman <[email protected]>. |
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* |
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* Licensed under the Apache License, Version 2.0 (the "License"); |
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* you may not use this file except in compliance with the License. |
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* You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0 |
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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*/ |
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namespace fkooman\VPN\Server\Config; |
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use InvalidArgumentException; |
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class IP |
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{ |
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/** @var string */ |
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private $ip; |
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/** @var int */ |
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private $prefix; |
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public function __construct($cidrIp) |
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{ |
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// must be of form IP/PREFIX |
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if (1 !== substr_count($cidrIp, '/')) { |
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throw new InvalidArgumentException('not in CIDR format'); |
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} |
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list($ip, $prefix) = explode('/', $cidrIp); |
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// check IP |
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self::validateIP($ip); |
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$this->ip = $ip; |
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// check prefix |
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if (!is_numeric($prefix) || 0 > $prefix || 32 < $prefix) { |
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throw new InvalidArgumentException('invalid prefix'); |
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} |
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$this->prefix = intval($prefix); |
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} |
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public function getRange() |
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{ |
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return sprintf('%s/%d', $this->ip, $this->prefix); |
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} |
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public function getNetmask() |
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{ |
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return long2ip(-1 << (32 - $this->prefix)); |
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} |
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public function getNetwork() |
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{ |
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return long2ip(ip2long($this->ip) & ip2long($this->getNetmask())); |
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} |
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public function getFirstHostAs6() |
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{ |
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$firstHost = $this->getFirstHost(); |
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$firstHost6 = str_split(bin2hex(inet_pton($firstHost)), 4); |
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return sprintf('::ffff:%s:%s', $firstHost6[0], $firstHost6[1]); |
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} |
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public function getFirstHost() |
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{ |
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return long2ip(ip2long($this->getNetwork()) + 1); |
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} |
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public function getLastHost() |
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{ |
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return long2ip(ip2long($this->getBroadcast()) + -1); |
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} |
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public function getBroadcast() |
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{ |
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return long2ip( |
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ip2long($this->getNetwork()) | ~ip2long($this->getNetmask()) |
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); |
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} |
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/** |
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* Check if a given IP address is in the range of the network. |
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* |
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* @param string $ip the IP address to check |
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* @param bool $includeNetworkBroadcast whether or not to consider the |
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* network and broadcast address of the network also part of the range |
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*/ |
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public function inRange($ip, $includeNetworkBroadcast = false) |
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{ |
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self::validateIP($ip); |
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$longIp = ip2long($ip); |
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$startIp = ip2long($this->getNetwork()); |
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$endIp = ip2long($this->getBroadcast()); |
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if ($includeNetworkBroadcast) { |
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return $longIp >= $startIp && $longIp <= $endIp; |
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} |
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return $longIp > $startIp && $longIp < $endIp; |
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} |
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/** |
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* Split the provided range in $no equal sized CIDRs. |
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*/ |
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public function splitRange($no) |
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{ |
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if (1 === $no) { |
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$prefixNo = 1; |
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} elseif (2 === $no) { |
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$prefixNo = 2; |
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} elseif (3 === $no || 4 === $no) { |
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$prefixNo = 4; |
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} else { |
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throw new InvalidArgumentException('too many instances, only 1,2,3 or 4 allowed'); |
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} |
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$prefix = $this->prefix + floor($prefixNo / 2); |
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$ranges = []; |
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for ($i = 0; $i < $no; ++$i) { |
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$noHosts = pow(2, 32 - $prefix); |
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$networkAddress = long2ip($i * $noHosts + ip2long($this->ip)); |
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$ip = new self($networkAddress.'/'.$prefix); |
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$ranges[] = $ip->getRange(); |
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} |
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return $ranges; |
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} |
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private static function validateIP($ip) |
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{ |
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if (false === filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4)) { |
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throw new InvalidArgumentException('invalid IP address'); |
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} |
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} |
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} |
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eduVPN /
vpn-server-api
