#!/usr/bin/env python

import sys, socket

def checkPortTCP(host, port):
	sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
	try:
		sock.connect((host, port))
		return 1
	except socket.error, reason:
		return 0

def main():
	hostname = raw_input("Please enter an IP or hostname: ")
	lowIP = int(raw_input("Please enter the start port number: "))
	highIP = int(raw_input("Please enter the end port number: "))

	port_range = range(lowIP, highIP + 1)
	open_ports = []
	sys.stdout.write("Port: ")
	sys.stdout.flush()
	for port in port_range:
		sys.stdout.write(str(port))
		sys.stdout.flush()
		if checkPortTCP(hostname, port):
			open_ports.append(port)
		sys.stdout.write("\b" * len(str(port)))
		sys.stdout.flush()

	sys.stdout.write("\nOpen ports: " + str(open_ports) + "\n")
	sys.stdout.flush()

if __name__ == "__main__":
	main()