import socket
import subprocess
import sys
from datetime import datetime

subprocess.call('cls', shell=True)

# Ask for input
remoteServer = input("Enter a remote host to scan: ")
startPort = int(input("Start scan to port: "))
endPort = int(input("End scan to port: "))

# Get ip by host name
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
try:
    openport = []
    for port in range(startPort, endPort + 1):
        sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        result = sock.connect_ex((remoteServerIP, port))
        if result == 0:
            print("Port {}: Open".format(port))
            openport.append(port)
        else:
            print(f"Port {port}: Close")
        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('Scanning Completed in: ', total)

#Printing the open port
print(f"Open port: {openport}")