phroxyp/proxy.php

91 行
3.3 KiB
PHP
Executable File

<?php
class Proxy {
public function __construct($serv, $port = 80, $root = '', $localRoot = '') {
// Functions
function str_replace_once($search, $replace, $subject) { // TODO Credit
$pos = strpos($subject, $search);
if ($pos === false) {
return $subject;
}
return substr($subject, 0, $pos) . $replace . substr($subject, $pos + strlen($search));
}
if (!function_exists('getallheaders')) { // TODO Credit
function getallheaders() {
if (!is_array($_SERVER)) {
return array();
}
$headers = array();
foreach ($_SERVER as $name => $value) {
if (substr($name, 0, 5) == 'HTTP_') {
$headers[str_replace(' ', '-', ucwords(strtolower(str_replace('_', ' ', substr($name, 5)))))] = $value;
} else if (substr($name, 0, 8) == 'CONTENT_') {
$headers[str_replace(' ', '-', ucwords(strtolower(str_replace('_', ' ', $name))))] = $value;
}
}
return $headers;
}
}
// Target determination
$metd = $_SERVER['REQUEST_METHOD'];
$reqp = $_SERVER['REQUEST_URI'];
if ($localRoot != '') {
$reqp = str_replace_once($localRoot, '', $reqp); // TODO Reliable method
}
// Preparing request headers
$reqHeds = "$metd $root$reqp HTTP/1.1\r\n";
$reqHeds .= "Host: $serv:$port\r\n";
// Converting client request headers to server request headers
$reqsHedsC = getallheaders();
foreach ($reqsHedsC as $name => $content) {
switch ($name) {
case 'Host':
case 'Connection':
break;
default:
$reqHeds .= "$name: $content\r\n";
}
}
$reqHeds .= "Connection: Close\r\n\r\n".file_get_contents('php://input');
$fp = fsockopen($serv, $port, $errno, $errstr, 30);
if (!$fp) { // TODO ErrorCode, ErrorDocument
echo "Couldn't connect to server.\n<br/>$errstr ($errno)<br />\n";
} else {
// Sending request
fwrite($fp, $reqHeds);
$resBuf = '';
while ($get = fgets($fp, 128)) {
// Getting response
if ($resBuf === True) { // If headers sent
echo $get;
} else {
$resBuf .= $get;
if ($sepPos = strrpos($resBuf, "\r\n\r\n")) { // Headers have been retrieved
$resHeds = explode("\r\n", substr($resBuf, 0, $sepPos));
foreach ($resHeds as $resHed) { // Setting headers
header($resHed);
if (substr($resHed, 0, 4) == 'HTTP') { // FastCGI fix when using ErrorDocument
header('Status: ' . substr($resHed, 9));
}
}
echo substr($resBuf, $sepPos + 4); // Sending the rest (usually empty)
$resBuf = True; // Setting mode to automatically redirect
}
}
}
fclose($fp);
}
}
}
?>