42 projects

Second step of the kernel-from-scratch series: GDT, interrupt handling and a keyboard-driven debug shell.

• C
• x86
• Assembly

A bootable i386 kernel written from scratch, with its own GDT and a VGA text driver.

• C
• x86
• Assembly

Data analysis, visualisation and a logistic regression written from scratch to sort students into Hogwarts houses.

• Python
• Machine learning

IRC server written in C++, compliant with part of the IRC protocol.

• C++

A raycasting 3D engine written in C, in the spirit of Wolfenstein 3D.

• C

• Full write-up
• Source code

A minimal Unix shell in C, modelled on bash: parsing, pipes, redirections, environment variables and signals.

• C

The dining philosophers problem in C: threads, mutexes and starvation-free scheduling without a single data race.

• C
• Threads

• Full write-up
• Source code

Small 2D game in C built on MiniLibX: sprite rendering, map parsing and keyboard events.

• C
• MiniLibX

• Full write-up
• Source code

Sorting a stack with a restricted instruction set, optimised to keep the number of operations as low as possible.

• C
• Algorithms

• Full write-up
• Source code

Reimplementation of the shell pipeline in C: fork, pipe, dup2 and process handling.

• C
• Unix

• Full write-up
• Source code

Reimplementation of printf in C, with variadic arguments and its own format parser.

• C

• Full write-up
• Source code

Reading a file descriptor line by line in C, with a static buffer kept between calls and no memory leak.

• C

• Full write-up
• Source code

A personal C library reimplementing part of the standard library, linked by every later 42 project.

• C
• Makefile

• Full write-up
• Source code

Finding and documenting a set of web vulnerabilities on a deliberately broken application.

• Web
• OWASP
• SQL

Security challenge: exploiting a chain of vulnerabilities to move from one user to the next on a Linux system.

• Linux
• Security

Automated deployment of a multi-service web stack on a remote server, provisioned from scratch with Ansible and Docker.

• Linux
• Ansible
• Docker

A small infrastructure of services (NGINX with TLS, WordPress, MariaDB), each in its own Docker container, orchestrated with Docker Compose.

• Docker

Setting up a hardened Linux virtual machine: LVM partitioning, firewall, SSH, sudo and password policies.

• Linux

Full-stack dating web application built with React, Node.js / Express and PostgreSQL.

• React
• Node.js
• Express
• PostgreSQL
• Socket.IO

Collaborative real-time web application built around an online multiplayer game.

• Web