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<?php
/**
* PEAR_Proxy
*
* HTTP Proxy handling
*
* @category pear
* @package PEAR
* @author Nico Boehr
* @copyright 1997-2009 The Authors
* @license http://opensource.org/licenses/bsd-license.php New BSD License
* @link http://pear.php.net/package/PEAR
*/
class PEAR_Proxy
{
var $config = null;
/**
* @access private
*/
var $proxy_host;
/**
* @access private
*/
var $proxy_port;
/**
* @access private
*/
var $proxy_user;
/**
* @access private
*/
var $proxy_pass;
/**
* @access private
*/
var $proxy_schema;
function __construct($config = null)
{
$this->config = $config;
$this->_parseProxyInfo();
}
/**
* @access private
*/
function _parseProxyInfo()
{
$this->proxy_host = $this->proxy_port = $this->proxy_user = $this->proxy_pass = '';
if ($this->config->get('http_proxy')&&
$proxy = parse_url($this->config->get('http_proxy'))
) {
$this->proxy_host = isset($proxy['host']) ? $proxy['host'] : null;
$this->proxy_port = isset($proxy['port']) ? $proxy['port'] : 8080;
$this->proxy_user = isset($proxy['user']) ? urldecode($proxy['user']) : null;
$this->proxy_pass = isset($proxy['pass']) ? urldecode($proxy['pass']) : null;
$this->proxy_schema = (isset($proxy['scheme']) && $proxy['scheme'] == 'https') ? 'https' : 'http';
}
}
/**
* @access private
*/
function _httpConnect($fp, $host, $port)
{
fwrite($fp, "CONNECT $host:$port HTTP/1.1\r\n");
fwrite($fp, "Host: $host:$port\r\n");
if ($this->getProxyAuth()) {
fwrite($fp, 'Proxy-Authorization: Basic ' . $this->getProxyAuth() . "\r\n");
}
fwrite($fp, "\r\n");
while ($line = trim(fgets($fp, 1024))) {
if (preg_match('|^HTTP/1.[01] ([0-9]{3}) |', $line, $matches)) {
$code = (int)$matches[1];
/* as per RFC 2817 */
if ($code < 200 || $code >= 300) {
return PEAR::raiseError("Establishing a CONNECT tunnel through proxy failed with response code $code");
}
}
}
// connection was successful -- establish SSL through
// the tunnel
$crypto_method = STREAM_CRYPTO_METHOD_TLS_CLIENT;
if (defined('STREAM_CRYPTO_METHOD_TLSv1_2_CLIENT')) {
$crypto_method |= STREAM_CRYPTO_METHOD_TLSv1_2_CLIENT;
$crypto_method |= STREAM_CRYPTO_METHOD_TLSv1_1_CLIENT;
}
// set the correct hostname for working hostname
// verification
stream_context_set_option($fp, 'ssl', 'peer_name', $host);
// blocking socket needed for
// stream_socket_enable_crypto()
// see
// <http://php.net/manual/en/function.stream-socket-enable-crypto.php>
stream_set_blocking ($fp, true);
$crypto_res = stream_socket_enable_crypto($fp, true, $crypto_method);
if (!$crypto_res) {
return PEAR::raiseError("Could not establish SSL connection through proxy: $crypto_res");
}
return true;
}
/**
* get the authorization information for the proxy, encoded to be
* passed in the Proxy-Authentication HTTP header.
* @return null|string the encoded authentication information if a
* proxy and authentication is configured, null
* otherwise.
*/
function getProxyAuth()
{
if ($this->isProxyConfigured() && $this->proxy_user != '') {
return base64_encode($this->proxy_user . ':' . $this->proxy_pass);
}
return null;
}
function getProxyUser()
{
return $this->proxy_user;
}
/**
* Check if we are configured to use a proxy.
*
* @return boolean true if we are configured to use a proxy, false
* otherwise.
* @access public
*/
function isProxyConfigured()
{
return $this->proxy_host != '';
}
/**
* Open a socket to a remote server, possibly involving a HTTP
* proxy.
*
* If an HTTP proxy has been configured (http_proxy PEAR_Config
* setting), the proxy will be used.
*
* @param string $host the host to connect to
* @param string $port the port to connect to
* @param boolean $secure if true, establish a secure connection
* using TLS.
* @access public
*/
function openSocket($host, $port, $secure = false)
{
if ($this->isProxyConfigured()) {
$fp = @fsockopen(
$this->proxy_host, $this->proxy_port,
$errno, $errstr, 15
);
if (!$fp) {
return PEAR::raiseError("Connection to the proxy failed: $errstr", -9276);
}
/* HTTPS is to be used and we have a proxy, use CONNECT verb */
if ($secure) {
$res = $this->_httpConnect($fp, $host, $port);
if (PEAR::isError($res)) {
return $res;
}
}
} else {
if ($secure) {
$host = 'ssl://' . $host;
}
$fp = @fsockopen($host, $port, $errno, $errstr);
if (!$fp) {
return PEAR::raiseError("Connection to `$host:$port' failed: $errstr", $errno);
}
}
return $fp;
}
}