nscheck - check DNS A and PTR records against multiple nameservers.

nscheck

#!/bin/bash

# nscheck
# Author: John Bartko <jbartko@gmail.com>

NS1=$(grep nameserver /etc/resolv.conf | head -n 1 | awk '{print $2}')
NS2='8.8.8.8'

DIG=/usr/bin/dig
DIGOPTS='+noall +answer '
USAGE=$(cat << 'EOUSAGE'
NAME\n
\tnscheck - check DNS A and PTR records against multiple nameservers.\n
\n
SYNOPSIS\n
\tnscheck -x IP\n
\tnscheck NAME\n
\tnscheck NAME -x IP -x IP NAME\n
\n
DESCRIPTION\n
\tPrints the results of a DNS query to multiple nameservers.\n
\n
\t-h\n
\t\tprint help\n
\n
\t-x\n
\t\tperform reverse lookup\n
EOUSAGE
)

function do_nscheck() {
    sed -e :a -e 's/^.\{1,79\}$/&#/;ta' <<<"### [ NS1 $NS1 ] "
    $DIG @$NS1 $DIGOPTS $@
    sed -e :a -e 's/^.\{1,79\}$/&#/;ta' <<<"### [ NS2 $NS2 ] "
    $DIG @$NS2 $DIGOPTS $@
    echo
}

while getopts "hx" OPT; do
    case $OPT in
        h ) echo -e $USAGE
            exit 0;;
        x ) DIGOPTS="${DIGOPTS}-x "
            shift;;
        * ) exit 1;;
    esac
done

do_nscheck

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