PortScanner.py | Basic Port Scanner

#! /usr/bin/env python
# PortScanner.py
# Author: Abdul Fatir
# E-Mail: [email protected]

from socket import *
HostName = raw_input("Host Name: ")
try:
    # gethostbyname(HostName) returns the IPv4 address of a website
    IPaddress = gethostbyname(HostName)
except:
    print "[-] Could not find host."
    quit()
portstring = raw_input("Ports (separated by commas):")
ports = portstring.split(",")
print "\n[*] Scan results for "+HostName+" ("+IPaddress+"):"
# setdefaulttimeout(1) sets the waiting time for website response to 1 seconds. This may result in closed port even though the port may be open if it takes more than 1 second.
setdefaulttimeout(1)
for port in ports:
    try:
        connection = socket(AF_INET,SOCK_STREAM)
        # socket.connect((IP,PORT)) connect to the IP at given port.
        connection.connect((IPaddress,int(port)))
        connection.send('hello\r\n')
        # socket.recv(BUFFER_SIZE) receives the server response
        data = connection.recv(8)
        # If we have reached this far that means the port is open.
        print "\t[+] "+port+"/tcp open"
    except:
        print "\t[-] "+port+"/tcp closed"
    finally:
        connection.close()