Lab 2.1 Port Scanning 1 - zacharylongo/Tech-Journals GitHub Wiki

#!/bin/bash

hostfile=$1
portfile=$2

# Check if the hostfile and portfile are provided
if [ -z "$hostfile" ] || [ -z "$portfile" ]; then
  echo "Usage: $0 <hostfile> <portfile>"
  exit 1
fi

# Check if the hostfile exists and is readable
if [ ! -r "$hostfile" ]; then
  echo "Error: Host file '$hostfile' does not exist or is not readable."
  exit 1
fi

# Check if the portfile exists and is readable
if [ ! -r "$portfile" ]; then
  echo "Error: Port file '$portfile' does not exist or is not readable."
  exit 1
fi

# Check if 'timeout' command is available
if ! command -v timeout &>/dev/null; then
  echo "Error: 'timeout' command is not available. Please install it."
  exit 1
fi

echo "host,port"
for host in $(cat "$hostfile"); do
  for port in $(cat "$portfile"); do
    timeout .1 bash -c "echo >/dev/tcp/$host/$port" 2>/dev/null &&
      echo "$host,$port"
  done
done