Arnaud lightdiscord

Proof of concept to use HAProxy to route traffic to relevant Minecraft server (not thoroughly tested)

Currently using static IP addresses in Map file, if using DNS name they need to be resolved

writeup-tsg-2021

The challenge is a crackme, it asks for an argument of 32 chars and gives it to a check function.

This check function fork the program multiple times and redirect the stdout of the child to /dev/null.

Every command is done under a nix-shell opened with the following command.

$ nix-shell -p gcc SDL2 steam-run

First thing compile the executable to debug controller hot plugging.

$ gcc ./main.c -o ./main -lSDL2

$ gcc -o a.out *.c && ./a.out
one: 4
two: 4
one: 42
two: 4

	#include <iostream>
	#include <stdexcept>
	#include <vector>
	#include <string>

	template <class T> struct size_of {
	static const int size = sizeof(T);
	};

	template <> struct size_of<void> {

	#include <unistd.h>
	#include <signal.h>
	#include <assert.h>
	#include <stdio.h>
	#include <sys/wait.h>

	void handle_sender(pid_t receiver) {
	for (int i = 0; i < 10; i++) {
	usleep(100);
	puts("Signal sent");

	#include <iostream>
	#include <vector>

	class Item {
	private:
	char identifier;

	public:
	Item(char identifier) : identifier(identifier) {
	std::cout << "Item's " << identifier << " constructor called" << std::endl;

	// Decode the response from the server
	function decode(plain) {
	return String.fromCharCode(...[...plain].map((c) => (c.charCodeAt(0) + 113) % 126))
	}

	$ clang -Wall -Wextra -g3 ./main.c -o main && ./main
	deadbeef