mirror of
https://github.com/gnh1201/caterpillar.git
synced 2024-11-26 23:41:44 +00:00
71 lines
2.2 KiB
PHP
71 lines
2.2 KiB
PHP
<?php
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// Caterpillar - The simple and parasitic web debugging proxy
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// Namhyeon Go <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: 2022-11-25
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define("PHP_HTTPPROXY_VERSION", "0.1.4");
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if (strpos($_SERVER['HTTP_USER_AGENT'], "php-httpproxy/") !== 0) {
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exit('<!DOCTYPE html><html><head><title>It works!</title><meta charset="utf-8"></head><body><h1>It works!</h1><p><a href="https://github.com/gnh1201/php-httpproxy">Download the client</a></p><hr><p>php-httpproxy/' . PHP_HTTPPROXY_VERSION . ' (Server; PHP ' . phpversion() . '; abuse@catswords.net)</p></body></html>');
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}
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ini_set("default_socket_timeout", 1); // must be. because of `feof()` works
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ini_set("max_execution_time", 0);
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function parse_headers($str) { // Parses HTTP headers into an array
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// https://stackoverflow.com/questions/16934409/curl-as-proxy-deal-with-https-connect-method
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// https://stackoverflow.com/questions/12433958/how-to-parse-response-headers-in-php
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$headers = array();
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$lines = preg_split("'\r?\n'", $str);
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$first_line = array_shift($lines);
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$headers['@method'] = explode(' ', $first_line);
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foreach ($lines as $line) {
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if (!preg_match('/^([^:]+):(.*)$/', $line, $out)) continue;
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$headers[$out[1]] = trim($out[2]);
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}
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return $headers;
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}
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$data = json_decode(file_get_contents('php://input'), true);
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$buffer_size = $data['chunksize'];
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$relay_data = base64_decode($data['data']);
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$relay_headers = parse_headers($relay_data);
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$relay_port = intval($data['port']);
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$relay_scheme = $data['scheme'];
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$relay_hostname = $data['server'];
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if ($relay_scheme == "https") {
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$relay_hostname = "tls://" . $relay_hostname;
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}
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switch ($relay_headers['@method'][0]) {
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case "CONNECT":
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echo sprintf("%s 200 Connection Established\r\n\r\n", $relay_headers['@method'][2]);
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break;
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default:
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$fp = fsockopen($relay_hostname, $relay_port, $errno, $errstr, 1);
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if (!$fp) {
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echo "$errstr ($errno)<br />\n";
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} else {
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fwrite($fp, $relay_data);
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$buf = null;
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while (!feof($fp) && $buf !== false) {
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$buf = fgets($fp, $buffer_size);
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echo $buf;
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}
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fclose($fp);
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}
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}
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