#!/bin/sh
# Copyright (C) 2019. Huawei Technologies Co., Ltd. All rights reserved.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 and
# only version 2 as published by the Free Software Foundation.
#
# This program 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.

SYS_LIVEPATCH=/sys/kernel/livepatch
G_TMP_DIR=/lib/modules/hotpatch.$$
G_PATCH_FILE=

#########################################################
#    Description: usage
#    Input:  
#    Return: 0-success
#########################################################
OS_HP_HELP()
{
	echo "usage: os_hotpatch"
	echo "-w|--check <filepath>         : check hotpatch"
	echo "-l|--load <filepath>          : load hotpatch"
	echo "-a|--active <patchname>       : active hotpatch"
	echo "-r|--rollback <patchname>     : rollback/deactive hotpatch"
	echo "-d|--delete <patchname>       : delete/unload hotpatch"
	echo "-q|--query <patchname>/all    : query hotpatch"
	echo "-h|--help                     : show this help information"
}

#########################################################
#    Description:  check hotpatch file before install
#    Input:  
#        $1: hotpatch file path
#    Return: 0-success,1-failed
#########################################################
OS_HP_CHECK()
{
	path=$1
	if [ ! -f "$path" ]; then
		echo "The file $path is not exit"
		exit 1;
	fi
	EXTRACT_HP $path
	if [ $? -ne 0 -o ! -f "$G_PATCH_FILE" ];then
		echo "The file $path is invalid"
		CLEAN_UP
		exit 1;
	fi
	CLEAN_UP
	echo "The file $path is valid"
	exit 0
}

#########################################################
#    Description: active a hotpatch 
#    Input:  
#        $1: hotpatch name(klp-xxx.tar.gz)
#    Return: 0-success,1-failed
#########################################################
OS_HP_ACTIVE()
{
	file=$1
	patch_name=`echo ${file%.tar.gz}|tr '-' '_'`
	patch_install=`lsmod | grep  -w $patch_name`

	if [ "$patch_install" == "" ]; then
		echo "patch $file not load"
		exit 1
	fi

	is_active=`cat ${SYS_LIVEPATCH}/${patch_name}/enabled`
	if [ ${is_active} == 1 ]; then
		echo "patch already active"
		exit 0
	fi

	echo 1 > ${SYS_LIVEPATCH}/${patch_name}/enabled 
	is_active=`cat ${SYS_LIVEPATCH}/${patch_name}/enabled`
	if [ ${is_active} == 1 ]; then
		echo "active patch $file success"
		exit 0
	else
		echo "active patch $file fail"
		exit 1
	fi
}

#########################################################
#    Description: deactive a hotpatch 
#    Input:  
#        $1: hotpatch name(klp-xxx.tar.gz)
#    Return: 0-success,1-failed
#########################################################
OS_HP_DEACTIVE()
{
	file=$1
	patch_name=`echo ${file%.tar.gz}|tr '-' '_'`
	patch_install=`lsmod | grep -w $patch_name`

	if [ "$patch_install" == "" ]; then
		echo "patch $file not load"
		exit 1
	fi

	is_active=`cat ${SYS_LIVEPATCH}/${patch_name}/enabled`
	if [ ${is_active} == 0 ]; then
		echo "patch $file already deactive"
		exit 0
	else
		echo 0 > ${SYS_LIVEPATCH}/${patch_name}/enabled 
		is_active=`cat ${SYS_LIVEPATCH}/${patch_name}/enabled`
		if [ ${is_active} != 1 ]; then
			echo "deactive patch $file success"
			exit 0
		else
			echo "deactive patch $file fail"
			exit 1
		fi
	fi
}

#########################################################
#    Description: remove a hotpatch 
#    Input:  
#        $1: hotpatch name(klp-xxx.tar.gz)
#    Return: 0-success,1-failed
#########################################################
OS_HP_REMOVE()
{
	file=$1
	patch_name=`echo ${file%.tar.gz}|tr '-' '_'`
	patch_install=`lsmod | grep -w $patch_name`

	if [ "$patch_install" == "" ]; then
		echo "patch $file not load"
		exit 1
	fi

	is_active=`cat ${SYS_LIVEPATCH}/${patch_name}/enabled`
	if [ ${is_active} == 0 ]; then
		rmmod ${patch_name}
	else
		echo 0 > ${SYS_LIVEPATCH}/${patch_name}/enabled 
		rmmod ${patch_name}
	fi

	patch_install=`lsmod | grep -w $patch_name`
	if [ "$patch_install" == "" ]; then
		echo "remove patch $file success"
		exit 0
	else
		echo "remove patch $file failed"
		exit 1
	fi
}

#########################################################
#    Description: query a hotpatch 
#    Input:  
#        $1: hotpatch name(klp-xxx.tar.gz) or all
#    Return: 0-success,1-not load,2-deactive,3-active,4-fault
#########################################################
OS_HP_INQUIRY()
{
	file=$1
	lret=0
	if [ "all" == $file ];then
		cd ${SYS_LIVEPATCH}
		if [ -z "`ls -d */ 2>/dev/null`" ];then
			exit 0
		fi
		for patch in `ls -d */ 2>/dev/null`
		do
			patch_id=${patch%/}
			patch_id=${patch_id#klp_}
			echo "Patch Name: ${patch_id}"
			lstate=`cat /${SYS_LIVEPATCH}/${patch}/enabled 2>/dev/null`
			if [ -z "$lstate" ];then
				echo "Patch State: Removing"
				echo "-----------------------------------------------------------"
				continue
			fi
			if [ $lstate -eq 1 ];then
				echo "Patch State: Active"
			else
				echo "Patch State: Deactive"
			fi
			cd ${SYS_LIVEPATCH}/${patch} 2>/dev/null
			depends=`ls -d */ 2>/dev/null`
			echo "Changes:"
			ls -l ${SYS_LIVEPATCH}/${patch}/*/ 2>/dev/null|grep '^d'|awk -F ' ' '{print "\t"$9}'
			echo "Denpendency: ${depends%/}"
			echo "-----------------------------------------------------------"
		done
		exit 0
	fi
	patch=`echo ${file%.tar.gz}|tr '-' '_'`
	patch_install=`lsmod | grep -w $patch`
	if [ "$patch_install" == "" ]; then
		exit 1
	fi
	patch_id=${patch%/}
	patch_id=${patch_id#klp_}
	echo "Patch Name: ${patch_id}"
	if [ `cat /${SYS_LIVEPATCH}/${patch}/enabled` -eq 1 ];then
		echo "Patch State: Active"
		lret=3
	else
		echo "Patch State: Deactive"
		lret=2
	fi
	cd ${SYS_LIVEPATCH}/${patch}
	depends=`ls -d */ 2>/dev/null`
	echo "Changes:"
	ls -l ${SYS_LIVEPATCH}/${patch}/*/ 2>/dev/null|grep '^d'|awk -F ' ' '{print "\t"$9}'
	echo "Denpendency: ${depends%/}"
	echo "-----------------------------------------------------------"

	exit $lret
}
#########################################################
#    Description: extract hotpatch tar to tmp dir
#    Input:  
#        $1: hotpatch file path
#    Return: 0-success,1-failed
#########################################################
EXTRACT_HP()
{
	rm -rf $G_TMP_DIR
	mkdir -p $G_TMP_DIR
	tar xzf $1 -C $G_TMP_DIR
	l_ret=$?
	if [ $l_ret -eq 0 ];then
		#find the hotpatch module
		G_PATCH_FILE=$(find $G_TMP_DIR|grep -w "klp.*\.ko")
		return 0
	else
		return 1
	fi
}
#########################################################
#    Description: clean up the tmp dir
#    Input:  
#    Return: none
#########################################################
CLEAN_UP()
{
	rm -rf $G_TMP_DIR
}
#########################################################
#    Description: install a hotpatch
#    Input:  
#        $1: hotpatch file path
#    Return: 0-success,1-failed
#########################################################
OS_HP_INSTALL()
{
	path=$1

	if [ ! -f "$path" ]; then
		echo "The file $path is not exit"
		exit 1;
	fi
	EXTRACT_HP $path
	if [ $? -ne 0 -o ! -f "$G_PATCH_FILE" ];then
		echo "The file $path is invalid!"
		CLEAN_UP
		exit 1;
	fi
	patch_name=`echo ${G_PATCH_FILE%.ko}|tr '-' '_'`
	patch_name=${patch_name##*/}
	patch_install=`lsmod | grep -w $patch_name`
	if [ "$patch_install" == "" ]; then
		echo "insmod $G_PATCH_FILE"
		insmod $G_PATCH_FILE
		L_RET=$?
		if [  0 -ne ${L_RET} ]; then
			echo "install patch $path fail"
			CLEAN_UP
			return 1
		else
			echo "install patch $path success"
		fi
	else
		echo "patch $path already install"
	fi
	CLEAN_UP
	return 0
}

#----------------------------main-------------------------#
if [ ! -d ${SYS_LIVEPATCH} ];then
	echo "this OS does not support kernel livepatch"
	exit 1
fi
input_args=`getopt -a -o l:a:r:d:w:q: -l load:,active:,delete:,check:,rollback:,query:,help,  -- "$@" 2>&1`
eval set -- "${input_args}"
while true;
do
	case "$1" in
		-w|--check)
			OS_HP_CHECK "$2"
			exit $?
			;;
		-l|--load)
			OS_HP_INSTALL "$2"
			exit $?
			;;
		-a|--active)
			OS_HP_ACTIVE "$2"
			exit $?
			;;
		-r|--rollback)
			OS_HP_DEACTIVE "$2"
			exit $?
			;;
		-d|--delete)
			OS_HP_REMOVE "$2"
			exit $?
			;;
		-q|--query)
			OS_HP_INQUIRY "$2"
			exit $?
			;;
		-h|--help)
			OS_HP_HELP
			exit 0
			;;
		*)
			OS_HP_HELP
			exit 1
			;;
	esac
done