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Title: A MINI PROJECT REPORT ON PORT SCANNER
INTRODUCTION:

A port scanner is a piece of software designed to search a network host for open ports. This is often used by administrators to check the security of their networks and by hackers to compromise it. An online port scanner will scan your computer looking for open ports. Programs use ports (like we use doors) to visit and communicate with the outside world (the net).Viruses now have built in port scanners that scour the internet looking for unsuspecting computers with open ports; when they find them, they cripple your software or worse, stay hidden and report your personal activity and information to another system.

To port scan a host is to scan for multiple listening ports on a single target host. This project basically about how to scan the local database of services of any remote system connected to the Server with the help of IP/TCP Address of the system connected to that server. The scanner also includes a module for testing connections (the Connect page) and allows the handling of the local database of services (the Services page).

After a hacker runs a port scanner on your system they know what services you have accepting connections. With this information they can begin attempting to exploit those services to obtain unauthorized access to your system.

The only way to track open ports is by using a port scanner, and the most accurate port scanner will be an online port scan. Scanning your ports using software like nmap will work fine, but it will not test your firewall's ability to block port activity. You need a port scanner that is not inside your network to verify accuracy. Our free online port scanner will help you do just that, but before we can scan your ports, we'll need you to verify that you are authorized to initiate the security scan.

PROPOSED SYSTEM:

Many Internet service providers deny their customers the ability to perform port scans outside of their home networks. This is usually covered in the Terms of Service or Acceptable Use Policy to which the customer must have already agreed. Other public and private networks may also place such limitations upon their users. Security and stability concerns associated with the program responsible for delivering the service. The application creates threads which attempt to connect to the supplied ip address and using the range of port numbers supplied. In this approach the effects of connection timeouts is minimized and the application can process a range of port.

INTRODUCTION

. Objective

. Scope

. Existing System

. Proposed System

. Software Requirement Specification

. System Environment

Objective:

There are hundreds of ports and service in which some of them are in common use. An intruder who sets up a backdoor may use an assigned port for an unregistered service and even he can inject a virus or Trojan horse into our system. A port scanner is a software application designed to probe a network host for open ports. This is often used by administrators to verify security policies of their networks and by hackers to identify running services on a host with the view to compromising it.

The main objective of this project is to scan the various ports within a specified range. With help of this administrator can easily identify the open ports and warn the clients.

Scope:

This project aims at the creation of a comprehensive application, which can be used at corporate environments.The application should be as simple as possible so that it can be configured even by a non-technical person.

Existing System:

Scanning entered the world along with the phone systems. Here we have this tremendous global telecommunications network, all reachable through codes on our telephone. Millions of numbers are reachable locally, yet we may only be interested in 0.5% of these numbers, perhaps those that answer with a carrier.

The logical solution to finding those numbers that interest us is to try them all. Thus the field of "war dialing" arose. . The basic idea is simple. If you dial a number and your modem gives you a CONNECT, you record it. Otherwise the computer hangs up and tirelessly dials the next one.

While war dialing is still useful, we are now finding that many of the computers we wish to communicate with are connected through networks such as the Internet rather than analog phone dialups.

Proposed system:

Over time, a number of techniques have been developed for surveying the protocols and ports on which a target machine is listening. We send a blizzard of packets for various protocols, and we deduce which services are listening from the responses we receive (or don't receive). The application creates threads which attempt to connect to the supplied ip address and using the range of port numbers supplied. In this approach the effects of connection timeouts is minimized and the application can process a range of port.

PROJECT ANALYSIS

Study of the system:

Port numbers 0 through 1023 are well-known ports that systems administrators usually use for only system processes or for programs that privileged users are running. If attackers exploit a well-known port, they can potentially gain control of server

In an effort to compromise a network, attackers use several generic schemes to scan ports. The following examples focus on TCP and UDP scanning:

TCP connect () scanning is the most basic form of TCP scanning. An attacker's host issues a connect () system call to every interesting port on the target machine. If the port is listening, connect () will succeed; otherwise, the port is unreachable and the service is unavailable. This attack scheme is fast and doesn't require any special privileges; however, port scanner can easily detect and block this attack at the target system.

UDP Internet Control Message Protocol (ICMP) port unreachable scanning is one of the few UDP scans. UDP is a connectionless protocol, so it's harder to scan than TCP because UDP ports aren't required to respond to probes. Most implementations generate an ICMP port unreachable error when a user (or intruder) sends a packet to a closed UDP port. Thus, a lack of a response indicates an active port. Unfortunately, UDP port scanning is not as reliable as TCP port scanning.

Project features:

Modules:

. Authentication module

. Scanning page

Authentication module:

In this module the administrator verifies the username and password. In ms access the administrator creates a database and in that the fields’ username and passwords are entered. Whenever a client enters his details the system checks those details by comparing them with the details present in the database. If he is an authorized user he can log onto the system or else the access will be denied.

Scanning module:

In this we u se the concept called multithreading to scan the multiple ports simultaneously. There are two types of scanning one is TCP scan and other is UDP scan. In TCP scan we send connect () system call to each and every port. If the port is open then connect () will proceed. In UDP scan we send a packet, if the packet is unreachable then we get ICMP port unreachable error. TCP scan is more reliable than UDP scan.

In the scan page the admin/clients have to specify the IP address of the target machine, type of scanning and the range of the ports to be scanned.

CONCLUSION:

The technological benefits of PORT SCANNER are monitor and enhance the performance of the system and provide security to the system.

Using port scanner we can scan multiple ports simultaneously by using the concept called multi threading, by this time will be saved. Mainly port scanners are used in firewalls to find the open ports, so that the firewall can protect our system from threats which attack through these open ports.

We can scan our own system with out any help of a web server and we don’t require any additional software to use this.

ADVANTAGES:

• We can scan multiple ports simultaneously.

• Any system in the LAN can be scanned by the authorized users.

• It is compatible on any operating system.

• It is mainly used to provide security.

FUTURE ENHANCEMENT: • In future administration will be given rights to close the open ports of the clients.

• Time limit will be given for each and every open port, if the port is not closed in the specified time it will be closed automatically.

• It can be extended as ONLINE PORT SCANNER.

Download A MINI PROJECT REPORT ON PORT SCANNER Project
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