portscanner.py

#! /usr/bin/python
#
#   This program is free software: you can redistribute it and/or modify
#   it under the terms of the GNU General Public License as published by
#   the Free Software Foundation, either version 3 of the License, or
#   (at your option) any later version.
#
#   This program is distributed in the hope that it will be useful,
#   but WITHOUT ANY WARRANTY; even without the implied warranty of
#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#   GNU General Public License for more details.
#
#   You should have received a copy of the GNU General Public License
#   along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
#   All code posted on my Pastebin is designed for Linux (Debian-based)
#
#   Description:
#       This python file takes one argument, the ip of the system
#       you want to scan. It then scans the tcp ports of your 'target'
#       to see if they are open.
#
#       Example:
#           ./portscanner.py 127.0.0.1
#
#       This example scans localhost to determine which ports are open.
#

import socket, sys, argparse
from datetime import datetime

def scan(target):
    try:

        for ports in range(1, 65535):
            s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
            s.setsockopt(socket.SOL_SOCKET,socket.SO_REUSEADDR,1)
            result = s.connect_ex((target, ports))
            if result == 0:
                print("Port {}: \t Open".format(ports))
            s.close()

    except Exception, e:
        print e
        return 1

def main():
    parser = argparse.ArgumentParser()
    parser.add_argument("target", help="The IP of the system you want to scan",type=str)
    a = parser.parse_args()

    scan(a.target)

main()