Introduction to Kali Linux:

Kali Linux is an open source system available in the Linux operating system. Nowadays, it is considered as a one of the best security Linux packages mainly used for ethical hackers. In this Kali Linux system, all the tools can be differentiated on the basis of different categories. Kali Linux is an advanced penetration testing and security auditing Linux distribution. Kali Linux is named after one of the Hindu Goddesses namely “Maa Kali”. This type of Linux system was first developed by Mati Aharoni is one of the lead Linux developers, trainers, and founders of offensive security. 

Features of Kali Linux:

The following are the important features of Kali Linux:

1. Offers complete customizations.

2. Supports multiple languages.

3. Provides vast wireless device support for multiple machines and compatible with USB devices.

4. Helps to switch from Ubuntu to Debian.

5. Easy upgrade to future versions.

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Why do people use Kali Linux?

The following are the key features of Kali Linux that will benefit the people:

1. Offers advanced penetration testing tool:

Kali Linux supports more than 500+ advanced penetration testing tools across multiple devices. The tools which are used in Linux sometimes cannot be repeated much like “Backtrack”.

2. Available as a free Linux tool:

The kali Linux system is totally free and offers better time services for multiple users. This is one of the huge factors to use this Linux system.

3. It is an open source GIT tool:

The kali Linux is an open source system and can be accessed by multiple users. All the codes which we have developed can be accessed by anyone. The open development source of Kali Linux can make an easy view to the development team.

4. Supportive tool:

Kali Linux offers hierarchical file systems, allows users to locate binaries, packages and supporting files, etc. This is also an important feature of kali Linux when compared to other Linux systems.

 Kali Linux installation and configuration guide:

In this section, we are going to explain the installation and configuration of Kali Linux:

A Back track was the older version of Kali Linux and the latest version of Kali 2016. 1 and it will be updated often.

Kali Linux installation and configuration

To install Kali Linux we have to follow these two steps:

1. Firstly, we have to download the Virtual box and then install it.

2. Then, we have to download and install the Kali Linux distribution software.

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Now we will discuss each step in brief:

1. Download and install the virtual box:

A virtual box is very useful when you want to test the codes in Kali Linux. Running Kali Linux codes on a Virtual box is safe and you can also know the unknown packages to test the codes.

By using the virtual box you can install Kali Linux on your device along with primary operating systems (like MAC, Windows, and Linux).

Now see the steps to download and install the virtual box:

Step1: To download the virtual box, go to the web page https: //www.virtualbox.org/wiki/Downloads. Now depending on your operating system, you need to select the right package. If you are using windows, you have to follow the below screen shot to know more,

download the virtual box

Step2: Now click on the Next button:

setup Wizard

Step 3: On the next page, you have to choose the location where you want to save the executable file. Now leave that as default and click next,

executable file

Step 4: Click Next and the following custom setup screenshot will pop up ->then select the features that you want to install -> now click the next button.

 custom setup

Step 5: Now click on yes to proceed with other installation processes.

installation processes.

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Step 6: Now ready to install screen will pop up-> then click install.

install screen

Step 7: Now click on the finish button.

 finish button.

The virtual box application screen will pop up. Now we are all set to install the rest of the host file for the manual device and also recommended for professional usage.

 virtual box application

Installing Kali Linux:

We have already installed the virtual box, now move to the next stop then install Kali Linux.

Step1: It’s time to download the Kali Linux package from the Kali official web page https: //www.kali.org/downloads.

Installing Kali Linux

Step2: Now click on virtual box -> select new as shown in the following screenshot,

 click on virtual box

Step 3: Now choose the correct virtual hard disk file -> click on open.

virtual hard disk file

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Step 4: you can see the following screenshot, then click on the create button.

 create button.

Step 5: Now start the Kali Operating system, the default username is a root and the password is toor.

 Kali Operating system

Update the kali software:

Once you finish installing, now it’s time to update the Kali Linux and provide a newer version to get advanced functionalities. The below are the steps involved update the Kali software;

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Step1: First go to the application -> then click on terminal-> after that, type “apt-get an update”-> then update the location as shown in the following screenshot.

 Update the kali software

terminal

Step 2: Now it’s time to upgrade the applications and tools -> then type “apt-get upgrade” -> then the packages/libraries will be downloaded.

applications and tools

Step 3: The below screenshot will ask, if you want to continue -> then type “Y” and click “Enter”.

continue

Step 4: To upgrade any newer version of the Linux operating system -> then type “apt-get distupgrade”.

upgrade newer version of the Linux

Laboratory set up:

In this section, we are going to set up the testing machine to perform any test-related applications with the help of Kali Linux tools.

Step1: You need to download metasploitable (this is a Linux machine). This can be downloaded from the official web page of Linux machine Rapid7 : https: //information.rapid7.com/ metasploitabledownload.html? LS (Linux system) = 1631875 & CS = Web.

Laboratory set up

Step 2: Register by supplying the details (as shown in the above screenshot). Once you finish filling the above form, you need to download the software.

Register by supplying

Step 3: Click on the virtual box -> then select new.

he virtual box

Step 4: click on the use of an existing virtual hard disk file -> browse the appropriate file (where you have downloaded the Metasploitable -> then click on open.

 virtual hard disk file

Step 5: Then you will get a screen where you need to create a virtual machine -> click on create.

 create a virtual machine

The default username you have to give is msfadmin and the password is msfadmin.

msfadmin

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 Is kali Linux better than Ubuntu?

The answer would be yes, Kali Linux system is better in the view of a pentester for the basic users it doesn’t require for general-purpose operations go with Ubuntu will all features. If you are in a dilemma about choosing Ubuntu software and having a thought of installing Kali Linux then there are other ways you can do it.

The following are the major points when you want to choose Kali and Ubuntu.

1. If you are looking for the operating system for network security, penetration testing, and other testing techniques, etc. Ubuntu cannot compete with the Kali Linux system.

2. If you are looking for the user –friendly, general-purpose operating system with the best GUI, Ubuntu is the best choice.

Ubuntu system is more suited for personal uses while Kali is best for Hackers, vulnerability testers and nerds, because of the tools they both come bundled with or (you can also install the same set of “Hacking” tools while installing on Ubuntu). Kali was a product of backtrack. Here all the binary packages only meant for Debian could be installed on Kali Linux and this is the power of the Kali Linux system. Kali has come with a number of penetration tools be it Wifi or any other database to be built instantly. One more point to be remembered is that Kali uses the APT for package management.

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Conclusion:

In this blog, we have explained the complete installation guide of the Kali Linux system, and also help our audience how to use it. The blog contents have been designed to help beginners who want to start their career as a Linux developer. This blog is also helpful for penetration testing experts. Once you finish this blog, you will be able to work on the moderate level to advanced applications of the Kali Linux system. 

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What are Socket Programming in Java

Socket programming is a method where two nodes on a network can connect and communicate with one another. While another socket reaches out to the first socket to establish a connection, one socket (or node) listens on a specific port at an IP address.
While the customer reaches out for the server, the server creates the listener socket. For connection-oriented socket programming, the classes Socket and Server Socket are utilized.

Programming using Java Sockets can be either connection-oriented or connection-less. For connection-oriented socket programming, While the customer reaches out for the server, the server creates the listener socket. For connection-oriented socket programming, the classes Socket and Server Socket are utilized. and DatagramSocket classes are used, while Socket and ServerSocket are used for connection-less socket programming.

What Is Java Socket

A Java socket is one terminal of a 2-way networked communication relationship between two programs. For the TCP layer to recognize the program that data is intended to be transferred to, a socket is tied to a port number.

Java Socket

A port number and an IP address make up an endpoint. An implementation of one side of a 2-way connection between the Java program and another program on the network is made possible by the class Socket, which is part of the Java platform’s package. The class resides on top of the platform-specific implementation, shielding your Java program from the specifics of every given system. Your Java programs can interact over the web in a platform-independent manner by utilizing the class rather than depending on native code.

Client-Side Programming

When using the client side, in the programming, the client initially watches for the server to launch. The requests will be sent to the server once it is operational. The client will then watch for the server’s answer. So, this is how server and client communication functions overall. Let’s now go deeper into client-side and server-side programming.

For starting with the requests from the client-side, the user needs to process the following steps:

Establish a connection :

Creating a socket connection is the initial action. The socket connection signifies that the 2 machines are aware of each other’s IP address and TCP port on the network.

The following statement will let you construct a socket:

Socket s = new s(“127.0.0.1”, 5000)

The first input in this case denotes the server’s IP address.

The TCP Port is represented by the second parameter. (A number that indicates which server-side program should be running.)

Communication :

Streams are utilized for both data input and output when communicating via a socket connection. You must shut down the connection after opening it and sending the requests.

Closing the connection :
Once the message has been transmitted to the server, the socket connection will explicitly close.

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Server-Side Programming

In essence, the server will create its object and await a request from the client. The server will reply with the response once the client will send the request.
Two sockets are required in order to program the server-side application, and they are as follows:

When a client calls newSocket(), a ServerSocket that is waiting for the requests from the client is created. There is a straightforward socket for client communication.
Following that, you must inform the client of the outcome.

Communication

The output is sent across the socket using the getOutputStream() function.

Closing the connection

Once everything is finished, it’s crucial to shut off the connection by shutting the socket and any active input/output streams.

  • You can run the server-side program first after configuring the client and server ends. After that, you must transmit the request and start client-side software. The server will reply as the client sends the request. The image below shows the same.

Closing the connection

  • The client will establish a connection and enter the request as a string.

Closing the connection 2

  • The server will reply to the request sent by the client.

Closing the connection 3

You must run a Java socket program in the given manner. These programs can also be run via a command window or terminal. However, as Eclipse is very feature-rich, you can easily run both apps on a console.

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Testing The Applications

The testing of applications is done using the IntelliJ application or any other IDE. 

  • Put the two programs together.
  • Start the client application after starting the server software.
  • Write a message in the client window, and the server window will simultaneously receive and display them.
  • Type BYE to leave.

This can be done using a command prompt also:

  • Create a new folder called project (this is the name of your package).
  • Place the project folder’s Server.java and Client.java files.
  • Go to the root path on the command prompt after opening it.
  • Run java project.Server first, then javac projectServer.java.
  • Use the same process to run the client and server programs.
  • Messages can then be typed in the window of the client.

The application can fail when a port has already been in use. Modify port no to a special number to resolve this problem.

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Conclusion

In this article, we have talked about socket and socket programming. Socket programming is a method where two nodes on a network can connect and communicate with one another. While another socket reaches out to the first socket to establish a connection, one socket (or node) listens on a specific port at an IP address. We have also discussed client-side and server-side along with testing the applications.

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