Haowei Wen yushijinhun

Tricks in Modern C++

is_specialization_of

Whether the type is a specialization of template T.

template  class T, typename U&gt;

Wireguard autmatic configuration ideas

Collection of ideas for automatic wireguard interface configuration

Generating ipv6 aadresses

Interface gets a link local ip like so fe80::hash(interfacepubkey)/64
Each peer allowed ips get fe80::hash(peerpubkey)/128

Pushing ipv6 configuration

Intel for display, NVIDIA for computing

This guide will show you how to use Intel graphics for rendering display and NVIDIA graphics for CUDA computing on Ubuntu 18.04 / 20.04 desktop.

I made this work on an ordinary gaming PC with two graphics devices, an Intel UHD Graphics 630 plus an NVIDIA GeForce GTX 1080 Ti. Both of them can be shown via lspci | grep VGA.

00:02.0 VGA compatible controller: Intel Corporation Device 3e92
01:00.0 VGA compatible controller: NVIDIA Corporation GP102 [GeForce GTX 1080 Ti] (rev a1)

Install Android apps or apk files in Windows using Windows Subsystem for Android

WSA or Windows Subsystem for Android is a Tool that allows Windows to run Android Apps directly without using any emulator. The problem is Windows Subsystem for Android is currently only available through preview via the Beta Channel of the Windows Insider Program. But if you follow my guide, you don't have to be in Windows Insider Program to try it out. The only thing you need is Windows 11 installed and some patience.

Prerequisites:

Windows Subsystem for Android or WSA must be Installed.

Click here to view the guide that shows how to install Windows Subsystem for Android in any Edition of Windows 11 (including Windows 11 Home) non Inider or stable release.

How to Install Android Apps or apk files in Windows Subsystem for Android:

First install Windows Subsystem for Android. [Click here](https://gist.github.com/HimDek/eb8704e2da1d98240153165743

Signed chat

This gist intends on clearing up some of the misinformation surrounding signed chat/the reporting feature Mojang has added to Minecraft 1.19.1. Here you can find both technical information as well as a general explanation of how these work.

Profile keys

After joining a server, clients now send a profile key used for verifying a message's authenticity. This key and thus the whole signing process is optional, but by default, servers enforce secure profiles for clients to send chat messages. Whenever the player sends a chat message and has a key associated, the message will be signed using their own private key, which the server then verifies using the public key sent after join. Assuming signature, timestamp, and message contents line up, the message goes through.

On the other end, clients can also require all broadcasted player messages to be signed, disregarding the ones without sender verified signatures.

	# Tested on Ubuntu 16.04 and X11, 2019

	# 1. Download NVIDIA driver as a .run file

	# 2. Stop X-Server
	sudo service lightdm stop

	# 3. Blacklist Nouveau driver
	sudo nano /etc/modprobe.d/blacklist-nouveau.conf

	/**
	* ra_prefix_filter.c - eBPF program to filter prefixes in IPv6 RA
	* Copyright (C) 2023 Haowei Wen <[email protected]>
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of the GNU General Public License
	* as published by the Free Software Foundation; either version 2
	* of the License, or (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful,