#!/bin/bash
# motd dynamic sysinfo script for debian hosts

HEADER="© www.flurweg.net | admin@domain.net | Phone: +436876543210"

#Easy setup this motd script:
# mkdir -p /etc/update-motd.d/
# wget -O /etc/update-motd.d/30-sysinfo http://www.flurweg.net/linux/debian/scripts/motd_30-sysinfo.txt
# chmod +x /etc/update-motd.d/30-sysinfo
# apt install bc
# mv /etc/motd /etc/motd.$(date +%Y%m%d)
# mv /etc/motd.tail /etc/motd.tail.$(date +%Y%m%d)

#Bash Color
YEL='\033[0;33m'
GRN='\033[0;32m'
RED='\033[0;31m'
REDH='\033[1;31m'
BLU='\033[1;34m'
STD='\033[0;0m'
WHT='\033[1;37m'

#bc Package installed ?
if [ -z `which bc` ]; then
        echo "you must install the bc Package for this script! $0"
        exit 1
fi

get_header(){
	echo -e "${WHT}$HEADER${STD}"
	echo "-------------------------------------------------------------------------------"
}

get_ipsettings(){
interfaces="$(ip a |grep 'inet '| grep -v ' lo'| grep -v '127.'| awk '{print $7}'| awk -F: '{print $1}')"
IPS="$(for int in ${interfaces[@]};
	do
		state="$(ip link show $int | awk '{print $9}')"
		ip_addr="$(ip -4 add show $int | grep inet | grep -v '127' | awk '{print $2}'| awk -F/ '{print $1}')"
		if [ ! -z $ip_addr ]; then
			dhcp=$(cat /etc/network/interfaces | grep "^iface\ ${int}\ inet\ " | grep -E 'static|dhcp' | awk -F ' ' '{print $4}')
			echo -n $ip_addr"($int|$state|$dhcp) "
		fi
	done
)"
DNS="$(cat /etc/resolv.conf | grep nameserver | awk '{print $2}' | tr '\r\n' ' ')"
GATEWAY=$(ip -o -4 route show to default | awk '{print $3}')
SUBNET=$(ip -o -f inet addr show | awk '/scope global/ {print $4}')
#Interface Name
INAME=$(ip -4 route ls | grep default | grep -Po '(?<=dev )(\S+)')
INAME=`echo $INAME` #trim
MAC="$(cat /sys/class/net/${INAME}/address)"
#Netzwerkstatistik (Umrechnung von Byte in MB)
NETWORKIN=$(echo "scale=1; $(cat "/sys/class/net/${INAME}/statistics/rx_bytes")/1024/1024" | bc -l)
NETWORKOUT=$(echo "scale=1; $(cat "/sys/class/net/${INAME}/statistics/tx_bytes")/1024/1024" | bc -l)
}

get_sysinfo(){
  HOSTNAME=`hostname`
  FQHN=`hostname -f`
  #Uptime
  uptime=$(</proc/uptime)
  uptime=${uptime%%.*}
  seconds=$(( uptime%60 ))
  minutes=$(( uptime/60%60 ))
  hours=$(( uptime/60/60%24 ))
  days=$(( uptime/60/60/24 ))
  SYSUPTIME="$days days, $hours hours, $minutes minutes"
  #Distro
  if [ -f /etc/os-release ]; then
	DISTRO=`cat /etc/os-release | grep PRETTY | cut -d "=" -f2 | sed -e 's/"//g'`
  else
	[ ! -f /usr/bin/lsb_release ] && apt_inst lsb-release
	DISTRO=$(lsb_release -ds)
  fi
  #CPU
  CPUTYPE=`cat /proc/cpuinfo | grep -i "model name" | cut -d ":" -f2 | sed -e 's/^ //' | tail -n 1`
  [ "$CPUTYPE" = "" ] && CPUTYPE=`cat /proc/cpuinfo | grep -i "processor" | cut -d ":" -f2 | sed -e 's/^ //' | grep ^[a-zA-Z]`
  CPUCORES=`grep -i '^processor' /proc/cpuinfo | cut -d ":" -f2 | sed -e 's/^ //' | grep ^[0-9] | sort -u | wc -l`
  CPUARCH=`uname -m`
  CPUUSAGE=$(ps aux | awk {'sum+=$3;print sum'} | tail -n 1)
  #Kernel
  KERNEL=`uname -r`
  #Login Users
  LIUSERS=`users | wc -w`
  LIUSERS=`echo $LIUSERS + 1 | bc` #Workaround for correctly counter when login!
  #IP Address
  IPADR=$(hostname -I | awk '{ print $1 }')
  #RAM Free
  RAMTOTAL=`free -mt | grep Mem: | awk '{ print $2}'`
  RAMUSAGE=`free -mt | grep Mem: | awk '{ print $3}'`
  RAMFREE=`free -mt | grep Mem: | awk '{ print $4}'`
  RAMPERC=$(echo "scale=0; 100*$RAMUSAGE/$RAMTOTAL" | bc -l)
  #Swap Free
  SWAPTOTAL=`free -mt | grep Swap: | awk '{ print $2}'`
  SWAPUSAGE=`free -mt | grep Swap: | awk '{ print $3}'`
  SWAPFREE=`free -mt | grep Swap: | awk '{ print $4}'`
  if [ "$SWAPTOTAL" = "0" ]; then
    SWAPPERC="0"
  else
    SWAPPERC=$(echo "scale=0; 100*$SWAPUSAGE/$SWAPTOTAL" | bc -l)
  fi
  #Disk Space (Rootdevice)
  ROOTFS=$(df -P / | tail -n 1 | awk '/.*/ { print $1 }')
  DISKTOTAL=`df -h | grep $ROOTFS | awk '{ print $2}' | tail -n 1`
  DISKTOTALZ=`df -h | grep $ROOTFS | awk '{ print $2}' | sed 's/[A-Za-z]*//g' | tail -n 1`
  DISKFREE=`df -h | grep $ROOTFS | awk '{ print $4}' | tail -n 1`
  DISKPERC=`df -h | grep $ROOTFS | awk '{ print $5}' | tail -n 1`
}

view_systeminfo(){
	get_header
	get_sysinfo
	get_ipsettings
	echo "  Hostname:             $FQHN"
	echo "  Linux Version:        $DISTRO"
	echo "  Kernel Version:       $KERNEL"
	echo "  Uptime:               $SYSUPTIME"
	echo "  Users Online:         $LIUSERS"
	echo ""
	echo "  IP Address:           $IPS"
	echo "  IP Gateway:           $GATEWAY"
	echo "  MAC Address:          $MAC"
	echo "  DNS Servers:          $DNS"
	echo "  Network Traffic:      ${NETWORKIN}MB received | ${NETWORKOUT}MB send"
	echo "  Memory:               ${RAMPERC}% used | ${RAMFREE}MB free | ${RAMTOTAL}MB total"
	echo "  Disk (rootfs):        ${DISKPERC} used | ${DISKFREE} free | ${DISKTOTAL} total"
	echo "  Swap:                 ${SWAPPERC}% | ${SWAPFREE}MB free | ${SWAPTOTAL}MB total"
	echo ""
	echo "  CPU Typ:              $CPUTYPE"
	echo "  CPU Cores/Arch/Load:  $CPUCORES | $CPUARCH | ${CPUUSAGE}%"
	echo "-------------------------------------------------------------------------------"
}

view_systeminfo