Peeyush Singh's Blog

Peeyush Singh's Blog

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Alice in Kernel Land: eBPF rabbit hole

Alice in Kernel Land: eBPF rabbit hole

What is eBPF? eBPF stands for (extended Berkeley Packet Filter). eBPF is the new version of a technology called BPF, which is a bytecode VM designed to run in kernel to analyze network traffic and provide filtering capabilities. eBPF extends BPF implementation with a lot of added functionality to call

Cryptography for you and me

Cryptography for you and me

This article is for the everyday Internet user to demystify cryptography and take a peek behind the curtains to understand basic cryptography, which has become an indispensable aspect of our everyday lives. From safeguarding our online communications and financial transactions to protecting our sensitive data, cryptography plays a vital role

The Values of the Hacker Ethic

The Values of the Hacker Ethic

The hackers' "Jargon File", compiled collectively on the Net, defines them as people who "program enthusiastically" and who believe that "information-sharing is a powerful positive good, and that it is an ethical duty of hackers to share their expertise by writing free software and facilitating access to information and to

Owning Your Data: Self-hosting Standard Notes at Home

Owning Your Data: Self-hosting Standard Notes at Home

This article is about self-hosting Standard Notes in your home network. Standard Notes is a free, open-source, and completely encrypted notes app which can be self-hosted anywhere. Alternatively, they also offer both free and paid PaaS solutions for hosting content on their servers. This post deals with hosting Standard Notes

Reflections on ChatGPT and LLMs for programming

Reflections on ChatGPT and LLMs for programming

ChatGPT is a chatbot that is built on a family of Large Language Models (LLMs) collectively known as GPT-3. GPT-3 (Generative Pre-trained Transformer 3) is a language model released by OpenAI that uses deep learning to produce human-like text. Language models work by trying to predict text using pre-existing models.

Book Summary: The Power of Introverts in a World That Can't Stop Talking by Susan Cain

Book Summary: The Power of Introverts in a World That Can't Stop Talking by Susan Cain

The introvert/extrovert divide is the most fundamental dimension of personality. Psychologist Carl Jung was the first to popularize the terms introverts and extroverts as the central building blocks of personality. Introverts are drawn to the inner world of thoughts and feelings, and extroverts to the external life of people

Self-hosting Ghost in Home Network on a Synology NAS

Self-hosting Ghost in Home Network on a Synology NAS

Introduction This article is about self-hosting a Ghost CMS in your home network on a Synology NAS. Ghost is an open source CMS platform that can be self-hosted for free. Alternatively, they also offer paid PaaS solutions for hosting content on their servers. This post deals with hosting Ghost at

VPN access to USB SMB Server on OpenWRT

VPN access to USB SMB Server on OpenWRT

Introduction This post deals with accessing an SMB server on a USB mounted to your home router via Tailscale VPN. The purpose is to have a shared folder on your home network which stores files that can be accessed and be modified by devices on your home network, thus reducing

Intrusion Detection using in-built Webcam

Intrusion Detection using in-built Webcam

Introduction This post is about building an intrusion detection system on Ubuntu using the laptop's in-built camera. It can be used to detect intrusion while you are out of your room or when someone tries to access your computer while it is locked. Also, no additional hardware is required for

OpenWRT

OpenWRT is a free and open source Linux based operating system for embedded devices such as routers. It is mainly used to increase the router's performance and security as compared to the default firmware that comes pre-installed with the router. OpenWRT currently supports about 2000 router models. The complete list

2FA with FIDO U2F / OTP / HOTP / TOTP

2FA with FIDO U2F / OTP / HOTP / TOTP

Two-factor authentication (2FA) is an authentication method where the user is granted access only after successfully authenticating oneself via two mechanisms. 1. Knowledge: something the user knows (eg. password, PIN) 2. Possession: something the user has (eg. physical key, smartphone) 3. Inheritance: something the user is (eg. fingerprint, iris scan)

WebSockets bypassing SOP/CORS

WebSockets bypassing SOP/CORS

Same-Origin-Policy (SOP) Same-Origin-Policy is a mechanism in browsers to protect the users from dynamically loaded document or script. It prevents running malicious scripts in browser to retrieve data from third party services. SOP specifies that dynamic requests can only be sent to URLs with the same Origin as the page

Docker

What is Docker? Docker is a tool that allows developers to package applications and all their dependencies in a container (sandbox) and deploy and run the application on host operating system (Linux). What are Containers, Images? A container is a discrete process that has been isolated from all other processes

Safe Navigation Operator? Bang! Bang Bang!!

Safe Navigation Operator? Bang! Bang Bang!!

Safe Navigation Operator Safe navigation operator or optional chaining is now available in JavaScript and TypeScript >= v3.7🎉. It provides easy access to deeply nested values, so checking for nullish (undefined or null) values is simplified. We avoid hitting the classic JavaScript error: Uncaught TypeError: Cannot read property 'foo' of

PWA Caching Strategies

PWA Caching Strategies

Caching strategies determine how a PWA behaves when the app makes a network request and how it deals with network failures. Workbox is a commonly used library for creating PWA; workbox-strategies provides the following caching strategies. Stale-While-Revalidate The service worker will serve the cached assets first, and update the cache

PWA Metadata in manifest.json

PWA Metadata in manifest.json

Every PWA should have a manifest file, a JSON file specifying metadata of the app. Manifest.json is required to add PWA to the homescreen. It defines how the app should look like and configures the app's behavior on launch. You can find the manifest.json file in public/ directory.

PWA with create-react-app

PWA with create-react-app

Setting up PWA with create-react-app and typescript. Install create-react-app if you haven't already. npm i create-react-app -g Create a react app with TypeScript and PWA support. Also, we are using NPM as package manager. Alternatively, you may use yarn. create-react-app frontend --use-npm --template cra-template-pwa-typescript To build the project run: npm

Internationalization using React-i18next legacy version (v9)

Internationalization using React-i18next legacy version (v9)

What is i18next? i18next is a popular framework for internationalization. React-i18next is the version of i18next for React applications. Why legacy version React-i18next? To use the latest version of React-i18next, the requirements are: * react >= v16.8.0 * react-dom >= v16.8.0 * react-native >= v0.59.0 * i18next >= v10.0.0(typescript