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<?php declare(strict_types=1);
/*
* This file is part of Composer.
*
* (c) Nils Adermann <naderman@naderman.de>
* Jordi Boggiano <j.boggiano@seld.be>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Composer\Util;
use Composer\Pcre\Preg;
use stdClass;
/**
* Tests URLs against NO_PROXY patterns
*/
class NoProxyPattern
{
/**
* @var string[]
*/
protected $hostNames = [];
/**
* @var (null|object)[]
*/
protected $rules = [];
/**
* @var bool
*/
protected $noproxy;
/**
* @param string $pattern NO_PROXY pattern
*/
public function __construct(string $pattern)
{
$this->hostNames = Preg::split('{[\s,]+}', $pattern, -1, PREG_SPLIT_NO_EMPTY);
$this->noproxy = empty($this->hostNames) || '*' === $this->hostNames[0];
}
/**
* Returns true if a URL matches the NO_PROXY pattern
*/
public function test(string $url): bool
{
if ($this->noproxy) {
return true;
}
if (!$urlData = $this->getUrlData($url)) {
return false;
}
foreach ($this->hostNames as $index => $hostName) {
if ($this->match($index, $hostName, $urlData)) {
return true;
}
}
return false;
}
/**
* Returns false is the url cannot be parsed, otherwise a data object
*
* @return bool|stdClass
*/
protected function getUrlData(string $url)
{
if (!$host = parse_url($url, PHP_URL_HOST)) {
return false;
}
$port = parse_url($url, PHP_URL_PORT);
if (empty($port)) {
switch (parse_url($url, PHP_URL_SCHEME)) {
case 'http':
$port = 80;
break;
case 'https':
$port = 443;
break;
}
}
$hostName = $host . ($port ? ':' . $port : '');
[$host, $port, $err] = $this->splitHostPort($hostName);
if ($err || !$this->ipCheckData($host, $ipdata)) {
return false;
}
return $this->makeData($host, $port, $ipdata);
}
/**
* Returns true if the url is matched by a rule
*/
protected function match(int $index, string $hostName, stdClass $url): bool
{
if (!$rule = $this->getRule($index, $hostName)) {
// Data must have been misformatted
return false;
}
if ($rule->ipdata) {
// Match ipdata first
if (!$url->ipdata) {
return false;
}
if ($rule->ipdata->netmask) {
return $this->matchRange($rule->ipdata, $url->ipdata);
}
$match = $rule->ipdata->ip === $url->ipdata->ip;
} else {
// Match host and port
$haystack = substr($url->name, -strlen($rule->name));
$match = stripos($haystack, $rule->name) === 0;
}
if ($match && $rule->port) {
$match = $rule->port === $url->port;
}
return $match;
}
/**
* Returns true if the target ip is in the network range
*/
protected function matchRange(stdClass $network, stdClass $target): bool
{
$net = unpack('C*', $network->ip);
$mask = unpack('C*', $network->netmask);
$ip = unpack('C*', $target->ip);
if (false === $net) {
throw new \RuntimeException('Could not parse network IP '.$network->ip);
}
if (false === $mask) {
throw new \RuntimeException('Could not parse netmask '.$network->netmask);
}
if (false === $ip) {
throw new \RuntimeException('Could not parse target IP '.$target->ip);
}
for ($i = 1; $i < 17; ++$i) {
if (($net[$i] & $mask[$i]) !== ($ip[$i] & $mask[$i])) {
return false;
}
}
return true;
}
/**
* Finds or creates rule data for a hostname
*
* @return null|stdClass Null if the hostname is invalid
*/
private function getRule(int $index, string $hostName): ?stdClass
{
if (array_key_exists($index, $this->rules)) {
return $this->rules[$index];
}
$this->rules[$index] = null;
[$host, $port, $err] = $this->splitHostPort($hostName);
if ($err || !$this->ipCheckData($host, $ipdata, true)) {
return null;
}
$this->rules[$index] = $this->makeData($host, $port, $ipdata);
return $this->rules[$index];
}
/**
* Creates an object containing IP data if the host is an IP address
*
* @param null|stdClass $ipdata Set by method if IP address found
* @param bool $allowPrefix Whether a CIDR prefix-length is expected
*
* @return bool False if the host contains invalid data
*/
private function ipCheckData(string $host, ?stdClass &$ipdata, bool $allowPrefix = false): bool
{
$ipdata = null;
$netmask = null;
$prefix = null;
$modified = false;
// Check for a CIDR prefix-length
if (strpos($host, '/') !== false) {
[$host, $prefix] = explode('/', $host);
if (!$allowPrefix || !$this->validateInt($prefix, 0, 128)) {
return false;
}
$prefix = (int) $prefix;
$modified = true;
}
// See if this is an ip address
if (!filter_var($host, FILTER_VALIDATE_IP)) {
return !$modified;
}
[$ip, $size] = $this->ipGetAddr($host);
if ($prefix !== null) {
// Check for a valid prefix
if ($prefix > $size * 8) {
return false;
}
[$ip, $netmask] = $this->ipGetNetwork($ip, $size, $prefix);
}
$ipdata = $this->makeIpData($ip, $size, $netmask);
return true;
}
/**
* Returns an array of the IP in_addr and its byte size
*
* IPv4 addresses are always mapped to IPv6, which simplifies handling
* and comparison.
*
* @return mixed[] in_addr, size
*/
private function ipGetAddr(string $host): array
{
$ip = inet_pton($host);
$size = strlen($ip);
$mapped = $this->ipMapTo6($ip, $size);
return [$mapped, $size];
}
/**
* Returns the binary network mask mapped to IPv6
*
* @param int $prefix CIDR prefix-length
* @param int $size Byte size of in_addr
*/
private function ipGetMask(int $prefix, int $size): string
{
$mask = '';
if ($ones = floor($prefix / 8)) {
$mask = str_repeat(chr(255), (int) $ones);
}
if ($remainder = $prefix % 8) {
$mask .= chr(0xff ^ (0xff >> $remainder));
}
$mask = str_pad($mask, $size, chr(0));
return $this->ipMapTo6($mask, $size);
}
/**
* Calculates and returns the network and mask
*
* @param string $rangeIp IP in_addr
* @param int $size Byte size of in_addr
* @param int $prefix CIDR prefix-length
*
* @return string[] network in_addr, binary mask
*/
private function ipGetNetwork(string $rangeIp, int $size, int $prefix): array
{
$netmask = $this->ipGetMask($prefix, $size);
// Get the network from the address and mask
$mask = unpack('C*', $netmask);
$ip = unpack('C*', $rangeIp);
$net = '';
if (false === $mask) {
throw new \RuntimeException('Could not parse netmask '.$netmask);
}
if (false === $ip) {
throw new \RuntimeException('Could not parse range IP '.$rangeIp);
}
for ($i = 1; $i < 17; ++$i) {
$net .= chr($ip[$i] & $mask[$i]);
}
return [$net, $netmask];
}
/**
* Maps an IPv4 address to IPv6
*
* @param string $binary in_addr
* @param int $size Byte size of in_addr
*
* @return string Mapped or existing in_addr
*/
private function ipMapTo6(string $binary, int $size): string
{
if ($size === 4) {
$prefix = str_repeat(chr(0), 10) . str_repeat(chr(255), 2);
$binary = $prefix . $binary;
}
return $binary;
}
/**
* Creates a rule data object
*/
private function makeData(string $host, int $port, ?stdClass $ipdata): stdClass
{
return (object) [
'host' => $host,
'name' => '.' . ltrim($host, '.'),
'port' => $port,
'ipdata' => $ipdata,
];
}
/**
* Creates an ip data object
*
* @param string $ip in_addr
* @param int $size Byte size of in_addr
* @param null|string $netmask Network mask
*/
private function makeIpData(string $ip, int $size, ?string $netmask): stdClass
{
return (object) [
'ip' => $ip,
'size' => $size,
'netmask' => $netmask,
];
}
/**
* Splits the hostname into host and port components
*
* @return mixed[] host, port, if there was error
*/
private function splitHostPort(string $hostName): array
{
// host, port, err
$error = ['', '', true];
$port = 0;
$ip6 = '';
// Check for square-bracket notation
if ($hostName[0] === '[') {
$index = strpos($hostName, ']');
// The smallest ip6 address is ::
if (false === $index || $index < 3) {
return $error;
}
$ip6 = substr($hostName, 1, $index - 1);
$hostName = substr($hostName, $index + 1);
if (strpbrk($hostName, '[]') !== false || substr_count($hostName, ':') > 1) {
return $error;
}
}
if (substr_count($hostName, ':') === 1) {
$index = strpos($hostName, ':');
$port = substr($hostName, $index + 1);
$hostName = substr($hostName, 0, $index);
if (!$this->validateInt($port, 1, 65535)) {
return $error;
}
$port = (int) $port;
}
$host = $ip6 . $hostName;
return [$host, $port, false];
}
/**
* Wrapper around filter_var FILTER_VALIDATE_INT
*/
private function validateInt(string $int, int $min, int $max): bool
{
$options = [
'options' => [
'min_range' => $min,
'max_range' => $max,
],
];
return false !== filter_var($int, FILTER_VALIDATE_INT, $options);
}
}