#!/bin/sh

cat > /dev/null << __EOF__
<description>
Keep an eye of:
*processes ran by "remote" users,
*temperature and load average,
*free memory and
*SSH break-in attempts
</description>
<long-description>
    <p>This is a simple system monitor that checks various things</p>
    <ul>
        <li>Logged in users that aren't normally logged in</li>
        <li>Processes ran by remote/compromisable users</li>
        <li>Top five processes from <code>top(1)</code></li>
        <li>Memory, CPU and disk usage</li>
        <li>Temperature</li>
        <li>Fail2ban and current connections to my SSH ports</li>
    </ul>
</long-description>
__EOF__

touch tmp.monitor
chmod 0600 tmp.monitor || exit
while :
do
    clear
    cat tmp.monitor
    
    echo "    **Procs**" > tmp.monitor
    top -bn1 | grep -E '(sshguest|www-data|agnes|COMMAND)' >> tmp.monitor
    N_PROCS=5
    top -bn1 | head -n $(($N_PROCS + 7)) | tail -n $(($N_PROCS)) >> tmp.monitor
    
    echo '    **who**' >> tmp.monitor
    #who | grep -vE '^oskar +(:0|tty[0-9])|^guest +tty[0-9]' >> tmp.monitor
    who >>tmp.monitor
    
    echo '    **uptime**' >> tmp.monitor
    uptime >> tmp.monitor
    
    echo '    **Fail2ban**' >> tmp.monitor
    today=`date +%Y-%m-%d`
    lines=5
    f="/var/log/fail2ban.log"
    echo Unban $(grep $today $f | grep Unban | wc -l) >> tmp.monitor
    grep $today $f | grep Unban | tail -n $lines >> tmp.monitor
    echo Ban $(grep $today $f | grep Ban | wc -l) >> tmp.monitor
    grep $today $f | grep Ban | tail -n $lines >> tmp.monitor
    
    echo '    **SSH**' >> tmp.monitor
    # 62.72.235.216
    netstat --inet -W -n  | grep -E '83\.245\.206\.247:22(22)? +[0-9]' | grep ESTABLISHED >> tmp.monitor
    
    echo '    **free**' >> tmp.monitor
    free -m >> tmp.monitor
    
    echo '    **Temp**' >> tmp.monitor
    sensors coretemp-isa-0000 | grep '°C' >> tmp.monitor
    
    echo '    **Disk space**' >> tmp.monitor
    df -H | grep -vE ' /(run|dev|sys)(/.*)?' >> tmp.monitor
    
    sleep 5
done