rtt-root_servers.sh

#!/bin/bash
#
# Desc: Check response time and hostname.bind server for each of the root-servers in IPv4 and IPv6
# Author: Mauricio Vergara Ereche <mave@cero32.cl>
# License: GPL-3.0-or-later
#
export PATH=/usr/local/opt/coreutils/libexec/gnubin/:/usr/local/bin:/bin:/usr/bin:/usr/sbin

QRY="CH TXT hostname.bind"
FLAGS="+stats +retry=0 +timeout=1"
IPV="4 6"

function ColorRange(){
	if [[ $1 =~ ^-?[0-9]+$ ]] ; then 
		case $1 in
			[1-9]) # Range 1-9 : GREEN
				colorcode="\033[1;32m"
				;;
			[0-2][0-9]) # Range 00-29 : CYAN
				colorcode="\033[0;36m"
				;;
			[3-6][0-9]) # Range 30-69 : BLUE
				colorcode="\033[1;34m"
				;;
			[7-9][0-9]) # Range 80-99 : YELLOW
				colorcode="\033[0;33m"
				;;
			1[0-4][0-9]) # Range 100-149 : BROWN
				colorcode="\033[1;33m"
				;;
			[1-9][5-9][0-9]) # Range 150-999 : RED
				colorcode="\033[0;31m"
				;;
			*)
				colorcode="\033[1;35m " # The REST PURPLE
		esac
		printf "%b%3d%b" ${colorcode} $1 "\033[0m"
	else
		colorcode="\033[1;35m " # The REST PURPLE
		printf "%b%s%b" ${colorcode} ${*} "\033[0m\n"
	fi
}

function Query(){
	MIN=9999
	MAX=0
	SUM=0
	CONT=1
	ipv="-${1}"
	for roots in {A..M}; do
		ROOT="${roots}.ROOT-SERVERS.NET."
		ANSt="$(dig ${FLAGS} ${ipv} @${ROOT} ${QRY} 2>/dev/null |egrep "(Query time|^hostname.bind)" 2>/dev/null)"
		if [ $? -eq 0 ] ; then
			ANS=$(echo ${ANSt} | awk '{printf "%s",$(NF-1)}')
			NAME=$(echo ${ANSt} | cut -d '"' -f2)
			printf " ${ROOT}: $(ColorRange ${ANS}) (${NAME})\n"
			CONT=$((CONT+1))	   
		else
			printf " %s: %bERROR %b\n" ${ROOT} "\033[0;35m" "\033[0m"
		fi
		if [ $ANS -le $MIN ] ; then MIN=$ANS ; fi
		if [ $ANS -ge $MAX ] ; then MAX=$ANS ; fi
		SUM=$((SUM+ANS))
	done

	printf "MIN: $(ColorRange ${MIN}) \n"
	printf "AVG: $(ColorRange $((SUM/CONT)) )\n"
	printf "MAX: $(ColorRange ${MAX} )\n"
}

ColorRange "Default_routers:"
netstat -rn|grep default|grep -v "fe80::"|awk '{ print $2}'
echo

ColorRange "Default_DNS_Resolver:"
dig . | grep \;\;\ SERVER\: | cut -d ":" -f2-
echo

for ipv in ${IPV}; do
    ColorRange "IPv${ipv}:"
	Query ${ipv}
	echo
done