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:

package {

import flash.display.Sprite;

import flash.net.Socket;

import flash.events.*;

import flash.errors.IOError;

import flash.display.Loader;

public class SocketTest extends Sprite {

public function SocketTest() {

var socket = new Socket();

socket.connect("localhost", 5277);

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(e:Event):void {

trace("Socket closed! ");

}

function connectHandler(e:Event):void {

trace("Socket connected!");

sendRequest();

}

function ioErrorHandler(e:IOErrorEvent):void {

trace("IOError!");

}

function securityErrorHandler(e:SecurityErrorEvent):void {

trace("SecurityError!");

}

function socketDataHandler(e:ProgressEvent):void {

trace("Socket have data!");

readResponse();

}

}

}

}

PHP:

//后台scoket程序,由于适用php写比较简单,就用php写了.

//error_reporting(E_ALL);

error_reporting(0);

set_time_limit(0);

ob_implicit_flush();

$address = ‘localhost‘;

$port = 5277;

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);

原文：http://www.jb51.net/article/53799.htm