From 0fc7659b1bb07e526c2336dd8703e39ab2ef1612 Mon Sep 17 00:00:00 2001
From: mykola2312 <49044616+mykola2312@users.noreply.github.com>
Date: Wed, 16 Mar 2022 15:18:16 +0200
Subject: [PATCH] Initial commit

---
 announce.php | 141 +++++++++++++++++++++++++++++++++++++++++++++++++++
 tracker.sql  |  50 ++++++++++++++++++
 2 files changed, 191 insertions(+)
 create mode 100644 announce.php
 create mode 100644 tracker.sql

diff --git a/announce.php b/announce.php
new file mode 100644
index 0000000..eb32ec4
--- /dev/null
+++ b/announce.php
@@ -0,0 +1,141 @@
+<?php
+require("../php/config.php");
+$DB_NAME = "torrent";
+$ANN_MIN_INTERVAL = 15;
+$ANN_INTERVAL = 60;
+
+function bad_request($msg)
+{
+    http_response_code(400);
+    echo($msg);
+    exit;
+}
+
+function do_error($msg)
+{
+    die($msg);
+}
+
+function hash_decode($urldata)
+{
+    return bin2hex(rawurldecode($urldata));
+}
+
+function hash_encode($str)
+{
+    return hex2bin($str);
+}
+
+function bencode ($var)
+{
+	if (is_string($var)) {
+		return strlen($var) .':'. $var;
+	} else if (is_int($var)) {
+		return 'i'. $var .'e';
+	} else if (is_float($var)) {
+		return 'i'. sprintf('%.0f', $var) .'e';
+	} else if (is_array($var)) {
+		if (count($var) == 0) {
+			return 'de';
+		} else {
+			$assoc = false;
+
+			foreach ($var as $key => $val) {
+				if (!is_int($key)) {
+					$assoc = true;
+					break;
+				}
+			}
+
+			if ($assoc) {
+				ksort($var, SORT_REGULAR);
+				$ret = 'd';
+
+				foreach ($var as $key => $val) {
+					$ret .= bencode($key) . bencode($val);
+				}
+				return $ret .'e';
+			} else {
+				$ret = 'l';
+
+				foreach ($var as $val) {
+					$ret .= bencode($val);
+				}
+				return $ret .'e';
+			}
+		}
+	} else {
+		do_error('bencode wrong data type');
+	}
+}
+
+
+if (!isset($_GET["info_hash"])) {
+    bad_request("No info_hash");
+}
+
+try {
+    $hash = hash_decode($_GET["info_hash"]);
+    $hashLen = strlen($hash);
+    if ($hashLen < 40 || $hashLen > 40) {
+        bad_request("Invalid info_hash");
+    }
+} catch (Exception $e) {
+    bad_request("Invalid info_hash");
+}
+
+try {
+    if (isset($_GET["ip"])) {
+        $ip = urldecode($_GET["ip"]);
+    } else if (isset($_SERVER["HTTP_X_FORWARDED_FOR"])) {
+        $ip = $_SERVER["HTTP_X_FORWARDED_FOR"];
+    } else {
+        $ip = $_SERVER["REMOTE_ADDR"];
+    }
+} catch (Exception $e) {
+    bad_request("Invalid ip");
+}
+
+if (!$ipAddr = inet_pton($ip)) {
+    bad_request("Invalid ip");
+}
+
+if (isset($_GET["port"])) {
+    $port = intval(urldecode($_GET["port"]));
+} else {
+    bad_request("No port");
+}
+
+$date = new DateTime("now");
+$now = $date->format('Y-m-d H:i:s');
+
+$conn = new PDO("mysql:host=$DB_HOST;dbname=$DB_NAME", $DB_USER, $DB_PASS);
+$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
+
+$stmt = $conn->prepare("REPLACE INTO `tracker` (info_hash, ip, port, update_time) VALUES (:info_hash, :ip, :port, :update_time)");
+$stmt->bindValue(":info_hash", $hash, PDO::PARAM_STR);
+$stmt->bindValue(":ip", $ip, PDO::PARAM_STR);
+$stmt->bindValue(":port", $port, PDO::PARAM_INT);
+$stmt->bindValue(":update_time", $now, PDO::PARAM_STR);
+$stmt->execute();
+
+$peers = '';
+
+$stmt = $conn->prepare("SELECT ip, port FROM `tracker` WHERE info_hash = :info_hash");
+$stmt->bindValue(":info_hash", $hash, PDO::PARAM_STR);
+$stmt->execute();
+$stmt->bindColumn(1, $peerIp);
+$stmt->bindColumn(2, $peerPort);
+while ($stmt->fetch(PDO::FETCH_BOUND)) {
+    //echo($peerIp . "\t" . $peerPort . "\n");
+    $peers .= pack("Nn", inet_pton($peerIp), $peerPort);
+}
+
+$response = array(
+    "min interval" => $ANN_MIN_INTERVAL,
+    "interval" => $ANN_INTERVAL,
+    "peers" => $peers,
+);
+echo(bencode($response));
+
+?>
\ No newline at end of file
diff --git a/tracker.sql b/tracker.sql
new file mode 100644
index 0000000..e66331f
--- /dev/null
+++ b/tracker.sql
@@ -0,0 +1,50 @@
+-- phpMyAdmin SQL Dump
+-- version 5.1.3
+-- https://www.phpmyadmin.net/
+--
+-- Host: localhost
+-- Generation Time: Mar 16, 2022 at 01:15 PM
+-- Server version: 10.7.3-MariaDB
+-- PHP Version: 7.4.28
+
+SET SQL_MODE = "NO_AUTO_VALUE_ON_ZERO";
+START TRANSACTION;
+SET time_zone = "+00:00";
+
+
+/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;
+/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;
+/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;
+/*!40101 SET NAMES utf8mb4 */;
+
+--
+-- Database: `torrent`
+--
+
+-- --------------------------------------------------------
+
+--
+-- Table structure for table `tracker`
+--
+
+CREATE TABLE `tracker` (
+  `info_hash` char(40) COLLATE utf8mb4_unicode_ci NOT NULL,
+  `ip` varchar(40) COLLATE utf8mb4_unicode_ci NOT NULL,
+  `port` smallint(5) NOT NULL,
+  `update_time` timestamp NOT NULL DEFAULT current_timestamp()
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
+
+--
+-- Indexes for dumped tables
+--
+
+--
+-- Indexes for table `tracker`
+--
+ALTER TABLE `tracker`
+  ADD PRIMARY KEY (`info_hash`,`ip`,`port`);
+COMMIT;
+
+/*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;
+/*!40101 SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */;
+/*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;