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caterpillar/index.php

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Create proxytest.php
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<?php
Update index.php
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// Caterpillar - The simple and parasitic web proxy with spam filter
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// Namhyeon Go (Catswords Research) <abuse@catswords.net>
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// https://github.com/gnh1201/caterpillar
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// Created at: 2022-10-06
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// Updated at: 2024-02-26
Create proxytest.php
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define("PHP_HTTPPROXY_VERSION", "0.2.0-dev");
Update index.php, server.py
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if (strpos($_SERVER['HTTP_USER_AGENT'], "php-httpproxy/") !== 0) {
exit('<!DOCTYPE html><html><head><title>It works!</title><meta charset="utf-8"></head><body><h1>It works!</h1><p><a href="https://github.com/gnh1201/caterpillar">Download the client</a></p><hr><p>php-httpproxy/' . PHP_HTTPPROXY_VERSION . ' (Server; PHP ' . phpversion() . '; abuse@catswords.net)</p></body></html>');
Update proxytest.php
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}
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ini_set("default_socket_timeout", 1); // must be. because of `feof()` works
Update proxytest.php
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ini_set("max_execution_time", 0);
Create proxytest.php
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Update index.php
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function jsonrpc2_encode($params) {
$data = array(
"jsonrpc" => "2.0",
"params" => $params
);
return json_encode($data);
}
function jsonrpc2_result_encode($result) {
$data = array(
"jsonrpc" => "2.0",
"result" => $result
);
return json_encode($data);
}
Update index.php
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function jsonrpc2_error_encode($error) {
$data = array(
"jsonrpc" => "2.0",
"error" => $error
);
return json_encode($data);
}
Update index.php
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Update proxytest.php
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function parse_headers($str) { // Parses HTTP headers into an array
Update proxytest.php
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// https://stackoverflow.com/questions/16934409/curl-as-proxy-deal-with-https-connect-method
// https://stackoverflow.com/questions/12433958/how-to-parse-response-headers-in-php
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$headers = array();
Create proxytest.php
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$lines = preg_split("'\r?\n'", $str);
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$first_line = array_shift($lines);
$headers['@method'] = explode(' ', $first_line);
Update proxytest.php
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Update proxytest.php
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foreach ($lines as $line) {
if (!preg_match('/^([^:]+):(.*)$/', $line, $out)) continue;
$headers[$out[1]] = trim($out[2]);
}
Create proxytest.php
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Update proxytest.php
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return $headers;
}
Create proxytest.php
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Update index.php
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// stateless mode
function relay_request($params) {
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$buffer_size = $params['buffer_size'];
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$request_data = base64_decode($params['request_data']);
$request_header = parse_headers($request_data);
$request_length = intval($params['request_length']);
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$client_address = $params['client_address'];
$client_port = intval($params['client_port']);
$client_encoding = $params['client_encoding'];
$remote_address = $params['remote_address'];
$remote_port = intval($params['remote_port']);
$scheme = $params['scheme'];
$url = $params['url'];
$datetime = $params['datetime']; // format: %Y-%m-%d %H:%M:%S.%f
if (in_array($scheme, array("https", "ssl", "tls"))) {
$remote_address = "tls://" . $remote_address;
Update index.php
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}
Update index.php
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Update index.php
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switch ($request_header['@method'][0]) {
Update index.php
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case "CONNECT":
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echo sprintf("%s 200 Connection Established\r\n\r\n", $request_header['@method'][2]);
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break;
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Update index.php
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default:
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$fp = fsockopen($remote_address, $remote_port, $error_code, $error_message, 1);
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if (!$fp) {
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$error = array(
"status" => 400,
"code" => $error_code,
"message" => $error_message
);
echo "HTTP/1.1 400 Bad Request\r\n\r\n" . jsonrpc2_error_encode($error);
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} else {
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fwrite($fp, $request_data);
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$buf = null;
while (!feof($fp) && $buf !== false) {
$buf = fgets($fp, $buffer_size);
echo $buf;
}
Update index.php
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Update index.php
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fclose($fp);
}
}
Add HTTP decryption (stable)
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}
Update index.php
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// stateful mode
function relay_connect($params) {
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$buffer_size = $params['buffer_size'];
$client_address = $params['client_address'];
$client_port = intval($params['client_port']);
$client_encoding = $params['client_encoding'];
$remote_address = $params['remote_address'];
$remote_port = intval($params['remote_port']);
$scheme = $params['scheme'];
$url = $params['url'];
$datetime = $params['datetime']; // format: %Y-%m-%d %H:%M:%S.%f
$fp = fsockopen($client_address, $client_port, $error_code, $error_message, 1);
if (!$fp) {
$error = array(
"status" => 400,
"code" => $error_code,
"message" => $error_message
);
echo "HTTP/1.1 400 Bad Request\r\n\r\n" . jsonrpc2_error_encode($error);
} else {
Update index.php
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fwrite($fp, jsonrpc2_result_encode(array("success" => true)));
$buf = null;
while (!feof($fp) && $buf !== false) {
$buf = fgets($fp, $buffer_size);
// todo
}
fclose($fp);
Update index.php
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}
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}
Update proxytest.php
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Update index.php
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// parse context
$context = json_decode(file_get_contents('php://input'), true);
// check is it jsonrpc
if ($context['jsonrpc'] == "2.0") {
$method = $context['method'];
switch ($method) {
case "relay_request":
relay_request($context['params']); // stateless mode
break;
case "relay_connect":
relay_connect($context['params']); // stateful mode
break;
}
Update index.php
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}
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