保护你的flash(as3)程序----基于socket方式传送swf文件

作者:roading 日期:2008-03-20 English

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前段时间在flashseer看到有人提到:可以通过socket方式传送swf文件,让用户无法获取到swf文件... 当时还没有出as3的反编译,所以对程序的保护没有在意.随着反编译程序的平民化,不希望别人看到源代码的朋友就比较着急...

通过socket方式传送swf文件来避免泄漏源代码的思路(只适用as3): 让主程序的loader(前台swf)通过socket连接到后台程序,然后请求需要的主程序文件.后台读取主程序数据通过socket发送给主程序的loader.前台swf适用Loader.loadBytes方法显示主程序文件.

下面是测试的源程序:

前台loader:
//-------------
//Base64和StringUtil在网上自己找吧
import Base64;
import StringUtil;
var socket = new Socket();
socket.connect("localhost", 11915);

socket.addEventListener(Event.CLOSE, closeHandler);
socket.addEventListener(Event.CONNECT, connectHandler);
socket.addEventListener(IOErrorEvent.IO_ERROR, ioErrorHandler);
socket.addEventListener(SecurityErrorEvent.SECURITY_ERROR, securityErrorHandler);
socket.addEventListener(ProgressEvent.SOCKET_DATA, socketDataHandler);

var response:String;

function writeln(str:String):void {
str += "";
try {
  socket.writeUTFBytes(str);
} catch (e:IOError) {
  trace(e);
}
}

function sendRequest():void {
trace("sendRequest");
response = "";
writeln('bin');
socket.flush();
}

function readResponse():void {
//接受数据
var str:String = socket.readUTFBytes(socket.bytesAvailable);
response += str;
//当数据以end结束的时候,数据传输结束
if(StringUtil.endsWith(str,'end'))
{
  response = response.substr(0,response.length-3);
//把字符串转换为ByteArray
  var ba = Base64.decodeToByteArray(response);
  //trace('bytearray=====',ba);
  var l:Loader = new Loader();
//从 ByteArray 对象中所存储的二进制数据中加载。
  l.loadBytes(ba);
  //trace(l.content);
  addChild(l);
}
}

function closeHandler(event:Event):void {
trace("closeHandler: " + event);
}

function connectHandler(event:Event):void {
trace("connectHandler: " + event);
sendRequest();
}

function ioErrorHandler(event:IOErrorEvent):void {
trace("ioErrorHandler: " + event);
}

function securityErrorHandler(event:SecurityErrorEvent):void {
trace("securityErrorHandler: " + event);
}

function socketDataHandler(event:ProgressEvent):void {
trace("socketDataHandler: " + event);
readResponse();
}

//后台scoket程序,由于适用php写比较简单,就用php写了.
<?php
//error_reporting(E_ALL);
error_reporting(0);
set_time_limit(0);

ob_implicit_flush();

$address = 'localhost';
$port = 11915;

if (($sock = socket_create(AF_INET, SOCK_STREAM, SOL_TCP)) < 0) {
echo "socket_create() failed: reason: " . socket_strerror($sock) . "\n";
}

if (($ret = socket_bind($sock, $address, $port)) < 0) {
echo "socket_bind() failed: reason: " . socket_strerror($ret) . "\n";
}

if (($ret = socket_listen($sock, 5)) < 0) {
echo "socket_listen() failed: reason: " . socket_strerror($ret) . "\n";
}
echo "connect................";
do {
if (($msgsock = socket_accept($sock)) < 0) {
echo "socket_accept() failed: reason: " . socket_strerror($msgsock) . "\n";
break;
}

do {

  socket_recv($msgsock, $buf, 2048, 0);
if ($buf == '') {
socket_close($msgsock);
    echo "some one quit";
break;
}
  else if($buf == 'bin')
  {
//读取主程序数据
   $f = fopen('main.swf','r');
   $data = fread($f,filesize('main.swf'));
   fclose($f);
//转换为字符串
   //echo base64_encode($data);
   $talkback = base64_encode($data).'end';
  }
//发送
socket_send($msgsock, $talkback, strlen($talkback),0);
} while (true);
socket_close($msgsock);
} while (true);

socket_close($sock);
?>