Dnstest

dnstest.sh

#!/usr/bin/env bash

command -v bc > /dev/null || { echo "bc was not found. Please install bc."; exit 1; }
{ command -v drill > /dev/null && dig=drill; } || { command -v dig > /dev/null && dig=dig; } || { echo "dig was not found. Please install dnsutils."; exit 1; }

NAMESERVERS=`cat /etc/resolv.conf | grep ^nameserver | cut -d " " -f 2 | sed 's/\(.*\)/&#&/'`

PROVIDERS="
1.1.1.1#cloudflare 
4.2.2.1#level3 
76.76.2.0#controld
8.8.8.8#google 
9.9.9.9#quad9 
80.80.80.80#freenom 
208.67.222.222#opendns 
199.85.126.20#norton 
185.228.168.9#cleanbrowsing 
76.76.19.19#alternatedns
94.140.14.14#adguard 
156.154.70.3#neustar 
8.26.56.26#comodo
"

# Domains to test. Duplicated domains are ok
DOMAINS2TEST="google.com amazon.com facebook.com youtube.com reddit.com wikipedia.org twitter.com whatsapp.com"

totaldomains=0
printf "%-18s" ""
for d in $(echo $DOMAINS2TEST | tr ' ' '\n' | sort -u); do
    totaldomains=$((totaldomains + 1))
    domain=$(echo "$d" | awk -F"." '{print $(NF-1)}')
    printf "%-15s" "$d"
done
printf "%-15s" "Average"
echo ""


for p in $NAMESERVERS $(echo $PROVIDERS | tr ' ' '\n' | sort -u); do
    pip=${p%%#*}
    pname=${p##*#}
    ftime=0

    printf "%-18s" "$pname"
    for d in $(echo $DOMAINS2TEST | tr ' ' '\n' | sort -u); do
        ttime=`$dig +tries=1 +time=2 +stats @$pip $d |grep "Query time:" | cut -d : -f 2- | cut -d " " -f 2`
        if [ -z "$ttime" ]; then
            #let's have time out be 1s = 1000ms
            ttime=1000
        elif [ "x$ttime" = "x0" ]; then
            ttime=1
        fi

        printf "%-15s" "$ttime ms"
        ftime=$((ftime + ttime))
    done
    avg=`bc -lq <<< "scale=2; $ftime/$totaldomains"`

    echo "  $avg"
done


exit 0;