首先,我正在开发的键盘记录器根本不是出于攻击性和破坏性目的。:)
我正在用 C#.NET 开发一个客户端监控应用程序。键盘记录是我的应用程序中的功能之一。虽然我已经开发了键盘记录器的代码,但我无法在我的应用程序中正确实现它。
我的解决方案中有两个项目。UserInterface - 用于服务器端。跟踪器 - 用于客户端 PC。键盘记录模块 Keylogger 位于 Tracker 项目中。
我已经使用辅助类进行套接字编程 - TcpClient、TcpListener 和 NetworkStream 来帮助他们。
另外,我正在使用异步模式进行通信。
我正在发布我面临问题的代码部分:
//This code resides on the server-side monitoring interface.When //the administrator hits a btnKeyLog button, a
message //"StartKeyLog" is sent to the respective client, and the keylogging //is handled on the client.
private void btnKeyLog_Click (对象发送者,EventArgs e) { messageBuffer = new byte[100];
if ( btnKeyLog1.Text == "Start Keylogging" )
{
btnKeyLog1.Text = "Stop Keylogging";
message = "StartKeyLog";
messageBuffer = Encoding.ASCII.GetBytes ( message );
try
{
//begin writing on the stream.
clientConnections[0].networkStream.BeginWrite (messageBuffer, 0, messageBuffer.Length, new
AsyncCallback ( onDataWrite ), null );
}
catch ( Exception exc )
{
MessageBox.Show ( exc.Message + exc.StackTrace );
}
}
else
{
btnKeyLog1.Text = "Start Keylogging";
message = "StopKeyLog";
messageBuffer = Encoding.ASCII.GetBytes ( message );
try
{
clientConnections[0].networkStream.BeginWrite ( messageBuffer, 0, messageBuffer.Length, new
AsyncCallback ( onDataWrite ), null );
}
catch ( Exception exc )
{
MessageBox.Show ( exc.Message + exc.StackTrace );
}
}
}
现在,客户端代码:
public void onDataReceived ( IAsyncResult ar )
{
int nBytesRead = 0;
try
{
nBytesRead = clientConnection.networkStream.EndRead ( ar );
}
catch ( Exception exc )
{
MessageBox.Show ( exc.Message + exc.StackTrace );
}
message = Encoding.ASCII.GetString ( messageBuffer,0, nBytesRead);
switch (message)
{
case "StartKeyLog" :
MessageBox.Show ( "Keylogger started." );
//the following static method wraps the Win32 //implementation of SetWindowsHookEx - all given in Keylogger //module
KeyboardHook.installHook ( );
//after this method is called, the hook is //actually installed; the callback function KeyboardHookProc is also //called.
Here, keylogger seems to be working fine, except that the //system slows down considerably when i type keystrokes.
break;
case "StopKeyLog":
MessageBox.Show ( "Keylogger stopped." );
// the following method releases the hook
KeyboardHook.releaseHook ( );
break;
}
try
{
messageBuffer = new byte[100];
clientConnection.networkStream.BeginRead ( messageBuffer, 0, messageBuffer.Length, new AsyncCallback ( onDataReceived ), null );
}
catch ( Exception exc )
{
MessageBox.Show ( exc.Message + exc.StackTrace );
}
//MessageBox.Show ( "Stop" );
//as soon as this function ends, however, the callback function of //the keyboard hook stops being called; keystrokes are not //processed.
//the keystrokes are caught until this function the control is in this //function. i assume that it has to do something with the thread.
}
我试图解释这里的情况。要启动键盘记录,服务器 UI 将向客户端发送消息“StartKeyLog”。客户端收到消息后,会在回调函数“onDataReceived”中进行处理。在这个函数中,消息被处理,
installHook() 方法被调用,它将安装钩子。
当我运行应用程序时,钩子就安装好了;此外,正确调用了 KeyboardHookProc() 回调,并处理了击键。但是这个
只有在 onDataReceived 回调方法有效之前才会出现这种情况。该方法一结束,KeyboardHookProc() 就停止被调用;钥匙
不再处理,就好像从未安装过钩子一样。
另一个问题是,在安装挂钩后,当我按任何键时系统变得相当慢。
我的假设是这两件事都与这里发生的线程有关。但是,我无法得到确切的问题。我已尽力解释情况。不过,欢迎提出任何问题。谁能给我解决方案??