DNS zone transfer script

Notice. I’ve made a web-based version of this script that has more functions and an archive for successful transfers. 

Script automating discovery of name servers allowing zone transfers.

Nothing fancy. Just to make it easier.

The output:

Zone transfer discoveredIf you use the command presented on the bottom of the image above you will get results like this:

Successful zone transfer for example domain


Script:

#!/bin/bash

domains="$1"
data="";

for dnsserver in $(host -t ns "$domains" | cut -d " " -f 4);
do
        # VARIABLES
        str_len=$(echo "$dnsserver" | tr -d " " | wc -c)
        str_len=$(echo "$str_len-2"| bc )
        dns_server=$(echo "$dnsserver" | cut -b "-$str_len")
        zone_data=$(dig axfr "$1" "@$dns_server")

        # CHECKING ZONE TRANSFER
        check=$(echo "$zone_data" | grep "Transfer failed" | wc -l)

        if [[ $check -ne 0 ]];
        then
                echo -e " Transfer \033[31mFAILURE\033[00m at $dns_server"
        else
                echo -e " Transfer \033[32mSUCCESS\033[00m at $dns_server"

                # REMEMBER LAST SUCCESSFUL
                data="$zone_data";
                server="$dns_server"
        fi

done

echo ""
echo " Use command: dig axfr $1 @$server"

# UNCOMMENT THIS IF YOU WANT ZONE DATA OUTPUT
# echo "$data"

Obrazek

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