hbcheck Heartbleed nmap/openssl bash script

#!/bin/bash

if [[ $# -eq 0 ]] ; then
    echo 'Usage: ./hbcheck <ip-range> eg. 192.168.1.0/24'
    exit 0
fi

tmpfile="tmp$RANDOM"

nmap -sT -p 443 --open -n -r -PN $1 |  grep report | awk '{print $5}' > $tmpfile

for i in $(awk '{print}' < $tmpfile )
do
echo "Checking $i"
echo EOF | openssl s_client -connect $i:443 -tlsextdebug 2<&1| grep 'server extension "heartbeat" (id=15)' || echo "$i is safe"
done

rm $tmpfile

exit 0