openScan [Java]

[treebeard]

Greetings,

openScan is an open source port scanner that I am making in Java, for practice as well as a medium to further my own knowledge. This is a very early release and is only a crude version with minimal features. I'm working through some of the main features and methods in a single class and then I'm going to start from the beginning and structure the project in a more proper OOP style. When I get some more work done I'll post a link to the Github repo in case anyone is interested enough to keep up with it.

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I hope you enjoy, thanks ^.^

********** openScan is for educational purposes only and I'm in no way responsible for the misuse or misconduct of any individual who chooses to break rules **********​

Spoiler: Original Design of Features

// Created by: Justin T

// Date: April 28, 2018

// Useful Information: Created using JDK 8 in IntelliJ IDEA.

// Purpose: Simple port scanner capable of reading an IPv4 address, starting port, and ending port.

//          Will print a message if the port is open.

// In Progress: Threading, IPv6 support, Search by domain name, Intervals of ports to scan, Designing simple GUI,

//              Display common port uses that are read from file, Write results to log file, Timeout.

//



import java.net.*;

import java.util.Scanner;



public class Main {

    public static void main(String[] args) {

        int startPort = 0;

        int endPort = 0;

        String targetIP;



        menu();



        startPort = setStartPort();

        endPort = setEndPort();

        targetIP = setTargetIP();



        scanPorts(targetIP, startPort, endPort);



        System.out.println("-----------------------------------------------------");

        System.out.println("The Port scan is complete.");



    }



    public static void menu() {

        System.out.println("             Welcome to openScan v1.0.0              ");

        System.out.println("-----------------------------------------------------");

        System.out.println("As of now the target must be entered in the form of an");

        System.out.println("IPv4 address. Attempting to use a domain name or an");

        System.out.println("IPv6 address will result in an error or the test not");

        System.out.println("running at all. Example: XXX.XXX.XXX or 127.0.0.1");

        return;

    }



    public static boolean isValidIPv4(String hostAddress) {

        boolean isValid;



        String[] splitIP = hostAddress.split("[.]");

        int ipPartOne = Integer.parseInt(splitIP[0]);

        int ipPartTwo = Integer.parseInt(splitIP[1]);

        int ipPartThree = Integer.parseInt(splitIP[2]);

        int ipPartFour = Integer.parseInt(splitIP[3]);



        if(! isValidPart(ipPartOne) || ! isValidPart(ipPartTwo) || ! isValidPart(ipPartThree)|| ! isValidPart(ipPartFour)){

            isValid = false;

            System.out.println("You have entered an invalid IPv4 address, please try again.");

        } else if (isReservedIP(splitIP)) {

            isValid = false;

            System.out.println("You have entered a reserved IPv4 address, please try again.");

        } else {

            isValid = true;

            System.out.println("Valid IPv4 address!! Attempting to connect now...");

        }



        return isValid;

    }



    public static boolean isValidPart(int ipPart) {

        if (ipPart > 255 || ipPart < 0) {

            return false;

        }

        return true;

    }



    public static boolean isReservedIP(String[] ipAddress) {

       if (ipAddress[0].equals("0") && ipAddress[1].equals("0") && ipAddress[2].equals("0") && ipAddress[3].equals("0")) {

            return true;

       } else if (ipAddress[0].equals("255") && ipAddress[1].equals("255") && ipAddress[2].equals("255") && ipAddress[3].equals("255")) {

            return true;

        } else {

            return false;

        }

    }



    public static boolean isValidPort(int port) {

        if (port > 65535 || port < 0){

            return false;

        }

        return true;

    }



    public static int setStartPort() {

        Scanner keyboard = new Scanner(System.in);

        boolean isValid;

        int tempPort = 0;



        do {

            System.out.println("Enter a starting port.");

            tempPort = Integer.parseInt(keyboard.nextLine());



            isValid = isValidPort(tempPort);



        } while(isValid == false);

        keyboard.close();

        return tempPort;

    }



    public static int setEndPort() {

        Scanner keyboard = new Scanner(System.in);

        boolean isValid;

        int tempPort = 0;



        do {

            System.out.println("Enter the ending port.");

            tempPort = Integer.parseInt(keyboard.nextLine());



            isValid = isValidPort(tempPort);



        } while(isValid == false);

        keyboard.close();

        return tempPort;

    }



    public static String setTargetIP() {

        Scanner keyboard = new Scanner(System.in);

        boolean isValid;

        String tempIP;



        do {

            System.out.println("Enter the IP of the machine you want to scan.");

            tempIP = keyboard.nextLine().trim();



            if (! isValidIPv4(tempIP)) {

                isValid = false;

            }



            isValid = true;



        } while (isValid == false);

        keyboard.close();

        return tempIP;

    }



    public static void scanPorts(String targetIP, int startPort, int endPort) {

        for(int i = startPort ;i <= endPort; i++) {

            try {

                Socket sock = new Socket(targetIP, i);

                System.out.println("Port: "+ i + " is open.");

                sock.close();

            } catch(Exception e) {

                // Port closed

            }

        }

        return;

    }



}

 
I re-wrote the application now that I planned most of the main features; all of the basic features from the first design are re-implemented already.
I'm currently working on writing log files for each scan. I've been working on another project that has a bit more of my attention but I'll continue to work on this in my spare time! After I finish the log files I'll start to work on threading, scan by domain name & IPv6, & scanning intervals of ports rather than just picking a start and end port.

Here's a little sample:

import java.util.Scanner;

public class ScanSettings {
    private final int startPort;
    private final int endPort;
    private final String targetIP;

    // Constructors

    ScanSettings() {
        this.startPort = setStartPort();
        this.endPort = setEndPort();
        this.targetIP = setTargetIP();
    }

    ScanSettings(int newStartPort, int newEndPort, String newTargetString) {
        this.startPort = newStartPort;
        this.endPort = newEndPort;
        this.targetIP = newTargetString;
    }

    // Accessor Methods

    public int getStartPort() {
        return this.startPort;
    }

    public int getEndPort() {
        return this.endPort;
    }

    public String getTargetIP() {
        return this.targetIP;
    }

    // Mutator Methods

    private static int setStartPort() {
        Scanner keyboard = new Scanner(System.in);
        boolean isValid;
        int tempPort = 0;

        do {
            System.out.println("Enter a starting port.");
            tempPort = Integer.parseInt(keyboard.nextLine());

            isValid = PortUtils.isValidPort(tempPort);

        } while(isValid == false);
        return tempPort;
    }

    private static int setEndPort() {
        Scanner keyboard = new Scanner(System.in);
        boolean isValid;
        int tempPort = 0;

        do {
            System.out.println("Enter the ending port.");
            tempPort = Integer.parseInt(keyboard.nextLine());

            isValid = PortUtils.isValidPort(tempPort);

        } while(isValid == false);
        return tempPort;
    }

    private static String setTargetIP() {
        Scanner keyboard = new Scanner(System.in);
        boolean isValid;
        String tempIP;

        do {
            System.out.println("Enter the IP of the machine you want to scan.");
            tempIP = keyboard.nextLine().trim();

            if (! IPUtils.isValidIPv4(tempIP)) {
                isValid = false;
            }

            isValid = true;

        } while (isValid == false);
        keyboard.close();
        return tempIP;
    }






}

The Github repo for this project can be found at:

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For those of you interested in following the project or contributing/forking it.

I wanna thank @SystemSequence for teaching me some new strategies.