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sakura/libraries/Net.php

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<?php
/**
* Holds the everything networking.
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*
* @package Sakura
*/
namespace Sakura;
/**
* Networking methods.
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*
* @package Sakura
* @author Julian van de Groep <me@flash.moe>
*/
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class Net
{
/**
* Returns the connecting IP.
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*
* @return string The IP.
*/
public static function IP()
{
return isset($_SERVER['REMOTE_ADDR']) ? $_SERVER['REMOTE_ADDR'] : '::1';
}
/**
* Detect the version of an IP.
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*
* @param string $ipAddr The IP.
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*
* @return int Either 0, 4 or 6.
*/
public static function detectIPVersion($ipAddr)
{
// Check if var is IP
if (filter_var($ipAddr, FILTER_VALIDATE_IP)) {
// v4
if (filter_var($ipAddr, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4)) {
return 4;
}
// v6
if (filter_var($ipAddr, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6)) {
return 6;
}
}
// Not an IP or unknown type
return 0;
}
/**
* Converts a printable IP address into an unpacked binary string.
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*
* @param string $ip Printable IP string.
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*
* @throws \Exception Thrown if an invalid IP is supplied.
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*
* @return string Unpacked IP address.
*/
public static function pton($ip)
{
// Detect the IP version
$ipv = self::detectIPVersion($ip);
// Check for IPv4 first since that's most common
if ($ipv === 4) {
return current(unpack("A4", inet_pton($ip)));
}
// Then attempt IPv6
if ($ipv === 6) {
return current(unpack("A16", inet_pton($ip)));
}
// Throw an exception if an invalid IP was supplied
throw new \Exception("Invalid IP address supplied.");
}
/**
* Converts a binary unpacked IP to a printable packed IP.
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*
* @param string $bin The unpacked IP.
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*
* @throws \Exception Thrown if the unpacked IP is invalid.
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*
* @return string The packed IP.
*/
public static function ntop($bin)
{
// Get the length of the binary string
$len = strlen($bin);
// Throw an exception if it's not 4 or 16 bytes
if ($len !== 4 && $len !== 16) {
throw new \Exception("Could not handle this IP type.");
}
// Finally pack the IP
return inet_ntop(pack("A{$len}", $bin));
}
public static function matchCIDR($ip, $range)
{
// Break the range up in parts
list($net, $mask) = explode('/', $range);
// Check IP version
$ipv = self::detectIPVersion($ip);
$rangev = self::detectIPVersion($net);
// Return false if it's not a valid IP
if ($ipv !== $rangev && !$ipv) {
return false;
}
// v4
if ($ipv === 4) {
return self::matchCIDRv4($ip, $net, $mask);
}
// v6
if ($ipv === 6) {
return self::matchCIDRv6($ip, $net, $mask);
}
// Return false by default
return false;
}
/**
* Match an IPv4 CIDR
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*
* @param string $ip The IP address to match.
* @param string $net The Net address to match.
* @param string $mask The Mask to match.
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*
* @return bool Returns true if it matches.
*/
private static function matchCIDRv4($ip, $net, $mask)
{
// Convert IP and Net address to long
$ip = ip2long($ip);
$net = ip2long($net);
// Generate mask
$mask = -1 << (32 - $mask);
// Do the check
return ($ip & $mask) === $net;
}
/**
* Converts an IPv6 mask to a byte array
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*
* @param int $mask The mask.
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*
* @return string The byte array.
*/
private static function maskToByteArray($mask)
{
// Generate an address from the mask
$addr = str_repeat("f", $mask / 4);
// Append uneven bit
switch ($mask % 4) {
case 1:
$addr .= '8';
break;
case 2:
$addr .= 'c';
break;
case 3:
$addr .= 'e';
break;
}
// Pad the address with zeroes
$addr = str_pad($addr, 32, '0');
// Pack the address
$addr = pack('H*', $addr);
// Return the packed address
return $addr;
}
/**
* Match an IPv6 CIDR
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*
* @param string $ip The IP address to match.
* @param string $net The Net address to match.
* @param int $mask The net mask.
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*
* @return bool Returns true if it's a successful match.
*/
private static function matchCIDRv6($ip, $net, $mask)
{
// Pack the IP and Net addresses
$ip = inet_pton($ip);
$net = inet_pton($net);
// Convert the mask to a byte array
$mask = self::maskToByteArray($mask);
// Compare them
return ($ip & $mask) === $net;
}
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/**
* Fetch a remote file
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*
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* @param string $url The location of the file
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*
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* @return mixed The contents of the remote file
*/
public static function fetch($url)
{
// Create a curl instance
$curl = curl_init();
// Set options
curl_setopt($curl, CURLOPT_URL, $url);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
curl_setopt($curl, CURLOPT_CONNECTTIMEOUT, 2);
curl_setopt($curl, CURLOPT_TIMEOUT, 4);
curl_setopt($curl, CURLOPT_USERAGENT, 'Sakura/' . SAKURA_VERSION);
// Execute
$curl = curl_exec($curl);
// Return the data
return $curl;
}
}