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Port Scanning With Netcat (Up to 1000 ports/second)

October 08, 2016 — metalkey

nano catscan.sh
#!/bin/bash
mkdir catscan-results
cp targets.txt catscan-results
cd catscan-results

# Use ping to get IP addresses. Strip bash colours from output with sed
echo "Generating IP list..."
for host in $(cat targets.txt);do
hostip=`ping -c 1 -W 1 $host | grep PING | cut -d"(" -f2 | cut -d")" -f1 | sed -r "s/\x1B\[([0-9]{1,2}(;[0-9]{1,2})?)?[m|K]//g"`
echo "$host resolves to $hostip"
echo "$host resolves to $hostip" >> host-ip.txt
echo $hostip >> temp-hosts.txt
done
wait

# Sort ips and remove dupes
sort -u temp-hosts.txt > hosts.txt
rm temp-hosts.txt

echo "Starting scan..."
# Scan y ports at a time and ouput to results.txt
# To change number of ports scanned at a time, change y, x incrementer, y incrementer
for ip in $(cat hosts.txt);do
x=0
y=1000
while [ $y -le 66000 ];do
echo "Scanning $ip (Ports $x - $y)"
for num in $(seq $x $y);do
netcat -vzn -w 1 $ip $num >> results.txt 2>&1 &
done
wait
x=$(( $x + 1000 ))
y=$(( $x + 1000 ))
grep $ip results.txt | grep " open" results.txt | sort -u
done
done
grep $ip results.txt | grep " open" results.txt | sort -u > open-ports.txt

Tags: port-scanning