#!/usr/bin/env python
import socket
import subprocess
import sys
from datetime import datetime


# Ask for input
remoteServer    = raw_input("\nEnter a remote host to scan: ")
remoteServerIP  = socket.gethostbyname(remoteServer)

# Print a nice banner with information on which host we are about to scan
print "-" * 60
print "Please wait, scanning remote host", remoteServerIP
print "-" * 60

# Check what time the scan started
t1 = datetime.now()

# Using the range function to specify ports (here it will scans all ports between 1 and 1024)

# We also put in some error handling for catching errors

for port in range(1,65535):
    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    try:
        result = sock.connect_ex((remoteServerIP, port))
        try:
            service=socket.getservbyport(port)
        except:
            pass
        if result == 0:
            print "Port {}:  Open".format(port),service
        sock.close()

    except KeyboardInterrupt:
        print "You pressed Ctrl+C"
        sys.exit()

    except socket.gaierror:
        print 'Hostname could not be resolved. Exiting'
        sys.exit()

    except socket.error:
        print "Couldn't connect to server"
        sys.exit()

# Checking the time again
t2 = datetime.now()

# Calculates the difference of time, to see how long it took to run the script
total =  t2 - t1

# Printing the information to screen
print '\nScan completed in: ', total,'\n'