Teknik is a suite of services with attractive and functional interfaces. https://www.teknik.io/
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<?php
/**
* Piwik - free/libre analytics platform
*
* @link http://piwik.org
* @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
*
*/
namespace Piwik;
/**
* Contains IP address helper functions (for both IPv4 and IPv6).
*
* As of Piwik 1.3, IP addresses are stored in the DB has VARBINARY(16),
* and passed around in network address format which has the advantage of
* being in big-endian byte order. This allows for binary-safe string
* comparison of addresses (of the same length), even on Intel x86.
*
* As a matter of naming convention, we use `$ip` for the network address format
* and `$ipString` for the presentation format (i.e., human-readable form).
*
* We're not using the network address format (in_addr) for socket functions,
* so we don't have to worry about incompatibility with Windows UNICODE
* and inetPtonW().
*
* @api
*/
class IP
{
const MAPPED_IPv4_START = '::ffff:';
/**
* Removes the port and the last portion of a CIDR IP address.
*
* @param string $ipString The IP address to sanitize.
* @return string
*/
public static function sanitizeIp($ipString)
{
$ipString = trim($ipString);
// CIDR notation, A.B.C.D/E
$posSlash = strrpos($ipString, '/');
if ($posSlash !== false) {
$ipString = substr($ipString, 0, $posSlash);
}
$posColon = strrpos($ipString, ':');
$posDot = strrpos($ipString, '.');
if ($posColon !== false) {
// IPv6 address with port, [A:B:C:D:E:F:G:H]:EEEE
$posRBrac = strrpos($ipString, ']');
if ($posRBrac !== false && $ipString[0] == '[') {
$ipString = substr($ipString, 1, $posRBrac - 1);
}
if ($posDot !== false) {
// IPv4 address with port, A.B.C.D:EEEE
if ($posColon > $posDot) {
$ipString = substr($ipString, 0, $posColon);
}
// else: Dotted quad IPv6 address, A:B:C:D:E:F:G.H.I.J
} else if (strpos($ipString, ':') === $posColon) {
$ipString = substr($ipString, 0, $posColon);
}
// else: IPv6 address, A:B:C:D:E:F:G:H
}
// else: IPv4 address, A.B.C.D
return $ipString;
}
/**
* Sanitize human-readable (user-supplied) IP address range.
*
* Accepts the following formats for $ipRange:
* - single IPv4 address, e.g., 127.0.0.1
* - single IPv6 address, e.g., ::1/128
* - IPv4 block using CIDR notation, e.g., 192.168.0.0/22 represents the IPv4 addresses from 192.168.0.0 to 192.168.3.255
* - IPv6 block using CIDR notation, e.g., 2001:DB8::/48 represents the IPv6 addresses from 2001:DB8:0:0:0:0:0:0 to 2001:DB8:0:FFFF:FFFF:FFFF:FFFF:FFFF
* - wildcards, e.g., 192.168.0.*
*
* @param string $ipRangeString IP address range
* @return string|bool IP address range in CIDR notation OR false
*/
public static function sanitizeIpRange($ipRangeString)
{
$ipRangeString = trim($ipRangeString);
if (empty($ipRangeString)) {
return false;
}
// IPv4 address with wildcards '*'
if (strpos($ipRangeString, '*') !== false) {
if (preg_match('~(^|\.)\*\.\d+(\.|$)~D', $ipRangeString)) {
return false;
}
$bits = 32 - 8 * substr_count($ipRangeString, '*');
$ipRangeString = str_replace('*', '0', $ipRangeString);
}
// CIDR
if (($pos = strpos($ipRangeString, '/')) !== false) {
$bits = substr($ipRangeString, $pos + 1);
$ipRangeString = substr($ipRangeString, 0, $pos);
}
// single IP
if (($ip = @inet_pton($ipRangeString)) === false)
return false;
$maxbits = strlen($ip) * 8;
if (!isset($bits))
$bits = $maxbits;
if ($bits < 0 || $bits > $maxbits) {
return false;
}
return "$ipRangeString/$bits";
}
/**
* Converts an IP address in presentation format to network address format.
*
* @param string $ipString IP address, either IPv4 or IPv6, e.g., `"127.0.0.1"`.
* @return string Binary-safe string, e.g., `"\x7F\x00\x00\x01"`.
*/
public static function P2N($ipString)
{
// use @inet_pton() because it throws an exception and E_WARNING on invalid input
$ip = @inet_pton($ipString);
return $ip === false ? "\x00\x00\x00\x00" : $ip;
}
/**
* Convert network address format to presentation format.
*
* See also {@link prettyPrint()}.
*
* @param string $ip IP address in network address format.
* @return string IP address in presentation format.
*/
public static function N2P($ip)
{
// use @inet_ntop() because it throws an exception and E_WARNING on invalid input
$ipStr = @inet_ntop($ip);
return $ipStr === false ? '0.0.0.0' : $ipStr;
}
/**
* Alias for {@link N2P()}.
*
* @param string $ip IP address in network address format.
* @return string IP address in presentation format.
*/
public static function prettyPrint($ip)
{
return self::N2P($ip);
}
/**
* Returns true if `$ip` is an IPv4, IPv4-compat, or IPv4-mapped address, false
* if otherwise.
*
* @param string $ip IP address in network address format.
* @return bool True if IPv4, else false.
*/
public static function isIPv4($ip)
{
// in case mbstring overloads strlen function
$strlen = function_exists('mb_orig_strlen') ? 'mb_orig_strlen' : 'strlen';
// IPv4
if ($strlen($ip) == 4) {
return true;
}
// IPv6 - transitional address?
if ($strlen($ip) == 16) {
if (substr_compare($ip, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xff\xff", 0, 12) === 0
|| substr_compare($ip, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 0, 12) === 0
) {
return true;
}
}
return false;
}
/**
* Converts an IP address (in network address format) to presentation format.
* This is a backward compatibility function for code that only expects
* IPv4 addresses (i.e., doesn't support IPv6).
*
* This function does not support the long (or its string representation)
* returned by the built-in ip2long() function, from Piwik 1.3 and earlier.
*
* @param string $ip IPv4 address in network address format.
* @return string IP address in presentation format.
*/
public static function long2ip($ip)
{
// IPv4
if (strlen($ip) == 4) {
return self::N2P($ip);
}
// IPv6 - transitional address?
if (strlen($ip) == 16) {
if (substr_compare($ip, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xff\xff", 0, 12) === 0
|| substr_compare($ip, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 0, 12) === 0
) {
// remap 128-bit IPv4-mapped and IPv4-compat addresses
return self::N2P(substr($ip, 12));
}
}
return '0.0.0.0';
}
/**
* Returns true if $ip is an IPv6 address, false if otherwise. This function does
* a naive check. It assumes that whatever format $ip is in, it is well-formed.
*
* @param string $ip
* @return bool
*/
public static function isIPv6($ip)
{
return filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6);
}
/**
* Returns true if $ip is a IPv4 mapped address, false if otherwise.
*
* @param string $ip
* @return bool
*/
public static function isMappedIPv4($ip)
{
return substr($ip, 0, strlen(self::MAPPED_IPv4_START)) === self::MAPPED_IPv4_START;
}
/**
* Returns an IPv4 address from a 'mapped' IPv6 address.
*
* @param string $ip eg, `'::ffff:192.0.2.128'`
* @return string eg, `'192.0.2.128'`
*/
public static function getIPv4FromMappedIPv6($ip)
{
return substr($ip, strlen(self::MAPPED_IPv4_START));
}
/**
* Get low and high IP addresses for a specified range.
*
* @param array $ipRange An IP address range in presentation format.
* @return array|bool Array `array($lowIp, $highIp)` in network address format, or false on failure.
*/
public static function getIpsForRange($ipRange)
{
if (strpos($ipRange, '/') === false) {
$ipRange = self::sanitizeIpRange($ipRange);
}
$pos = strpos($ipRange, '/');
$bits = substr($ipRange, $pos + 1);
$range = substr($ipRange, 0, $pos);
$high = $low = @inet_pton($range);
if ($low === false) {
return false;
}
$lowLen = strlen($low);
$i = $lowLen - 1;
$bits = $lowLen * 8 - $bits;
for ($n = (int)($bits / 8); $n > 0; $n--, $i--) {
$low[$i] = chr(0);
$high[$i] = chr(255);
}
$n = $bits % 8;
if ($n) {
$low[$i] = chr(ord($low[$i]) & ~((1 << $n) - 1));
$high[$i] = chr(ord($high[$i]) | ((1 << $n) - 1));
}
return array($low, $high);
}
/**
* Determines if an IP address is in a specified IP address range.
*
* An IPv4-mapped address should be range checked with an IPv4-mapped address range.
*
* @param string $ip IP address in network address format
* @param array $ipRanges List of IP address ranges
* @return bool True if in any of the specified IP address ranges; else false.
*/
public static function isIpInRange($ip, $ipRanges)
{
$ipLen = strlen($ip);
if (empty($ip) || empty($ipRanges) || ($ipLen != 4 && $ipLen != 16)) {
return false;
}
foreach ($ipRanges as $range) {
if (is_array($range)) {
// already split into low/high IP addresses
$range[0] = self::P2N($range[0]);
$range[1] = self::P2N($range[1]);
} else {
// expect CIDR format but handle some variations
$range = self::getIpsForRange($range);
}
if ($range === false) {
continue;
}
$low = $range[0];
$high = $range[1];
if (strlen($low) != $ipLen) {
continue;
}
// binary-safe string comparison
if ($ip >= $low && $ip <= $high) {
return true;
}
}
return false;
}
/**
* Returns the most accurate IP address availble for the current user, in
* IPv4 format. This could be the proxy client's IP address.
*
* @return string IP address in presentation format.
*/
public static function getIpFromHeader()
{
$clientHeaders = @Config::getInstance()->General['proxy_client_headers'];
if (!is_array($clientHeaders)) {
$clientHeaders = array();
}
$default = '0.0.0.0';
if (isset($_SERVER['REMOTE_ADDR'])) {
$default = $_SERVER['REMOTE_ADDR'];
}
$ipString = self::getNonProxyIpFromHeader($default, $clientHeaders);
return self::sanitizeIp($ipString);
}
/**
* Returns a non-proxy IP address from header.
*
* @param string $default Default value to return if there no matching proxy header.
* @param array $proxyHeaders List of proxy headers.
* @return string
*/
public static function getNonProxyIpFromHeader($default, $proxyHeaders)
{
$proxyIps = array();
$config = Config::getInstance()->General;
if(isset($config['proxy_ips'])) {
$proxyIps = $config['proxy_ips'];
}
if (!is_array($proxyIps)) {
$proxyIps = array();
}
$proxyIps[] = $default;
// examine proxy headers
foreach ($proxyHeaders as $proxyHeader) {
if (!empty($_SERVER[$proxyHeader])) {
$proxyIp = self::getLastIpFromList($_SERVER[$proxyHeader], $proxyIps);
if (strlen($proxyIp) && stripos($proxyIp, 'unknown') === false) {
return $proxyIp;
}
}
}
return $default;
}
/**
* Returns the last IP address in a comma separated list, subject to an optional exclusion list.
*
* @param string $csv Comma separated list of elements.
* @param array $excludedIps Optional list of excluded IP addresses (or IP address ranges).
* @return string Last (non-excluded) IP address in the list.
*/
public static function getLastIpFromList($csv, $excludedIps = null)
{
$p = strrpos($csv, ',');
if ($p !== false) {
$elements = explode(',', $csv);
for ($i = count($elements); $i--;) {
$element = trim(Common::sanitizeInputValue($elements[$i]));
if (empty($excludedIps) || (!in_array($element, $excludedIps) && !self::isIpInRange(self::P2N(self::sanitizeIp($element)), $excludedIps))) {
return $element;
}
}
}
return trim(Common::sanitizeInputValue($csv));
}
/**
* Retirms the hostname for a given IP address.
*
* @param string $ipStr Human-readable IP address.
* @return string The hostname or unmodified $ipStr on failure.
*/
public static function getHostByAddr($ipStr)
{
// PHP's reverse lookup supports ipv4 and ipv6
// except on Windows before PHP 5.3
$host = strtolower(@gethostbyaddr($ipStr));
return $host === '' ? $ipStr : $host;
}
}