#!/usr/bin/bash

# os check
# build 2021-06-16

#1、磁盘根分区剩余百分比                        			#返回数值，并添加触发器报警
function disk(){
    local _part _disk
    _part=$(lsblk -b |grep "centos-root"|awk '{print $(NF-3)}'|awk -F'G' '{print $1}')
    _disk=$(lsblk -b |grep sda|grep disk|awk '{print $(NF-2)}'|awk -F'G' '{print $1}')
    echo "scale=2;a=${_part}/${_disk};if (length(a)==scale(a)) print 0;print a " |bc
}

#2、内存剩余百分比										#返回数值
function memory(){
    local _memFree _memTotal
    _memFree=$(free -b |awk 'NR==2{print $4}')
    _memTotal=$(free -b |awk 'NR==2{print $2}')
    echo "scale=2;a=${_memFree}/${_memTotal};if (length(a)==scale(a)) print 0;print a " |bc
}

#3、swap使用情况											#返回数值
function memory(){
    free -m |awk 'NR==3{print $3}'
}

#4、cpu 1、5、15分钟负载									#返回数值或其他类型
function cpuLoad(){
    case $1 in
    1)
        uptime |awk '{print $(NF-2)}'|awk -F',' '{print $1}'
    ;;
    5)
        uptime |awk '{print $(NF-1)}'|awk -F',' '{print $1}'
    ;;
    15)
        uptime |awk '{print $(NF)}'|awk -F',' '{print $1}'
    esac
}

#5、/etc/passwd /etc/shadow /etc/sodoers 等文件修改情况	#返回任意类型，并添加触发器报警
function fileMD5(){
    [ ! -f /tmp/md5.hash ] && md5sum /etc/passwd /etc/shadow /etc/sudoers > /tmp/md5sum && echo "数据收集中"
    md5sum -c /tmp/md5.hash |grep -E "FAILED|失败"
}

#6、系统启动时间											#返回任意类型
function uptime(){
    local _uptime _idletime
    _uptime=$(cat /proc/uptime |awk '{print ($1/60)}') # 单位为分钟
    _idletime=$(cat /proc/uptime |awk '{print ($2/60)}') # 系统空闲时间
    case $1 in
    upTime)
        echo $_uptime
    ;;
    idleTime)
        echo $_idletime
    ;;
    idle)
        echo "scale=2;a=${_idletime}/${_uptime};if (length(a)==scale(a)) print 0;print a " |bc
    esac
}

#7、系统连接数											#返回数值
function conns(){
    case $1 in
    all)
        netstat -an | grep ESTABLISHED | wc -l
    ;;
    [1-9]*)
        lsof -i:$1 |wc -l
    esac
}

#8、系统开启端口数量										#返回任意类型，需要知道是哪些端口
function ports(){
    local p
    case $1 in
    portList)
        p="`ss -tnul | grep -v Netid |awk '{print $5}'|awk -F ':' '{print $NF}'|sort -n|uniq`"
        echo $p
    ;;
    port)
        ss -tnul | grep -v Netid |awk '{print $5}'|awk -F ':' '{print $NF}'|sort -n|uniq|wc -l
    esac
}

#9、系统开机启动服务										#返回任意类型
function services(){
    local s
    case $1 in
    servicesList)
        s="`ls /etc/systemd/system/multi-user.target.wants/`"
        echo $s
    ;;
    service)
        ls /etc/systemd/system/multi-user.target.wants/ |wc -l
    esac
}

#10、计划任务											#返回文本
function crontab(){
    sudo crontab -l -u $1
}