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C# EasyHook ws2_32.dll WSARecv

 
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ErrorMaker
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Posts: 21

PostPosted: Wed Sep 18, 2013 10:16 am    Post subject: C# EasyHook ws2_32.dll WSARecv Reply with quote

Hello CEF Smile

I'm trying to get all data from WSARecv function of ws2_32.dll using EasyHook (inject into firefox.exe)
I get the data but they look weird, like this:


Data of the hooked send function are ok.

This is my wsarecv hooked function:
Code:
        private static int wsarecv_Hooked(IntPtr socketHandle, ref NativeSocketMethod.WSABuffer buf, int count, IntPtr bytesTransferred, int socketFlags, IntPtr overlapped, IntPtr completionRoutine)
        {
            if (Interface != null)
            {
                int bytesCount = 0;
                try
                {
                    bytesCount = buf.len;
                    if (bytesCount > 0)
                    {
                        byte[] newBuffer = new byte[bytesCount];
                        Marshal.Copy(buf.buf, newBuffer, 0, bytesCount);
                        string s = System.Text.ASCIIEncoding.ASCII.GetString(newBuffer);
                        File.AppendAllText("C:\\hook.txt", "WSARecv: " + "\r\n" + s + "\r\n");
                    }
                }
                catch
                {
                    Interface.LogToScreen("WSARecv error");
                }
            }
            return NativeSocketMethod.WSARecv(socketHandle, ref buf, count, bytesTransferred, socketFlags, overlapped, completionRoutine);
        }


And this is the structure of WSABuffer:
Code:
        [StructLayout(LayoutKind.Sequential)]
        public struct WSABuffer
        {
            internal Int32 len;
            // Length of Buffer
            internal IntPtr buf;
            // Pointer to Buffer
        }


What am I doing wrong?

Thanks in advance
- ErrorMaker
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Dark Byte
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PostPosted: Wed Sep 18, 2013 5:01 pm    Post subject: Reply with quote

You are reading the buffer before you have received data into that buffer

Also, a secondary problem is that if it's an overlapped recv operation then you must hook(override) the completionroutine, else you will read the buffer before the read is done

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