#!/bin/bash
#
# System authorization information.
# SSH prevents violent cracking
# Email: aixiao@aixiao.me
# Time: 20170909
#

source /etc/profile

function init() {
    SEND_MAIL=1
    PWD_PATH="/root";
    TIME=`date +"%Y%m%d%H%M"`;
    LOG_FILE="${PWD_PATH}/${TIME}.log";
    EMAIL_ADDRESS="1605227279@qq.com";
    IPTABLES=$(which iptables)
    
    IPTABLES_SAVE=$(which iptables-save)
}

function run()
{
    echo "Read-Only Memory,ROM:" &>> ${LOG_FILE}
    df -am &>> ${LOG_FILE}

    echo "random access memory，RAM:" &>> ${LOG_FILE}
    free -hl &>> ${LOG_FILE}

    echo "System process:" &>> ${LOG_FILE}
    ps -auxwwf &>> ${LOG_FILE}

    echo "Network Connections" &>> ${LOG_FILE}
    netstat -tnulp &>> ${LOG_FILE}

    echo "System SSH authorization information:" &>> ${LOG_FILE}
    /root/denyhosts/rhost | awk '{a[$1]+=1;} END {for(i in a){print a[i]" "i;}}' &>> ${LOG_FILE}

    $IPTABLES_SAVE > /root/ipv4tables

    echo "" &>> ${LOG_FILE}
    echo "Iptables filter table" &>> ${LOG_FILE}
    $IPTABLES -L -n --line-numbers &>> ${LOG_FILE}
    echo "" &>> ${LOG_FILE}

    if test $SEND_MAIL = 1; then
        mail -s "System Log" ${EMAIL_ADDRESS} < ${LOG_FILE}
        rm ${LOG_FILE}
    fi
    
    sync
}


init;
run;
exit 0;
20190103
20190911
20191008
20210614
aixiao@aixiao.me