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How to make a small tweak to free software

The target audience for this is people who are beginners at software engineering and using linux. A lot of the information here may be obvious or already known to you. The language involved is C but you do not need to know any C to read this tutorial. I used mg to write this blog post. I used vs code to edit the source code.

This post is also available on gopher://tilde.team:70/0/~river/tweak-free-software

If you use a piece of free software and it's 99% perfect but there's just this one thing it does that annoys the hell out of you.. you can in theory just fix it! Here's a look at what doing that is like. Hopefully it inspires you, or you pick up a could tricks on the way!

Step 0: Have a problem

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This is explaining stuff relevant to AOC 2021 day 6

How is a matrix used to count fish?

First lets do fibonacci numbers because it's smaller (2x2 matrix instead of 9x9) and it's familiar ground.

So you can implement fibs like this:

def fib(n):

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Here's a quick dockerfile:

----------------8<-------------[ cut here ]------------------
FROM debian:latest

RUN apt-get update && apt-get install -y nodejs npm
----------------8<-------------[ cut here ]------------------

save that as Dockerfile and do: docker build -t node-builder .
 

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HTTPS vs HTTP, security properties

HTTPS provides some very important security properties that HTTP does not.

It provides confidentiality, integrity and authentication.

• Confidentiality: What you're loading cannot be snooped on by others. Eve is on the same networking as you, and can listen into your traffic - but if it's HTTPS they cannot read it. If it was plain HTTP they could see what you were looking at and copy your session cookies to potentially log in to sites as you.
• Integrity, Authentication: You know that if a document you recieve is valid it is unmodified. Mallory cannot set up a man in the middle attack and edit the documents in transit, if it was HTTP they could do this with arp poisoning/cain and abel - and change all the images on the pages you are looking at to rick astley.

Implementing confidentiality requires a cipher and a system for keys, initialization vectors and such. It's rather involved.

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Raspberry Pi, Static HTTPS site with Docker and Nginx

This tutorial is dated Oct 2021, if it's much further on than that this information might be out of date.

This is a guide on setting up a static HTTPS website on your raspberry pi using docker and nginx. The aim is to have this running on the raspberry pi and to be able to access it from a host computer on the same local network. You should already be able to ssh into your pi from your host computer and have raspberry pi OS set up.

Find your raspberry pi

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Why is IRC distributed across multiple servers?

I have been wondering for a long time why IRC networks have multiple servers. Wouldn't it be simpler just to use a single server?

One of the problems of having multiple servers is that netsplits can occur. Anybody who has been on IRC for a while will have witnessed one. Hundreds of people suddenly ripped out of the chat. This can also screw up channel and user modes, and 'some people' have been known to wait for netsplits in order to takeover channels or enter password protected channels.

So lets compare situation (A) a single IRC server everyone connects to with the current setup people use (B) multiple servers. Let's say you run an IRC network with u = 40,000 users and n = 20 server nodes that people connect to via round robin DNS (meaning that when people resolve the DNS it gives them a random server from the set of 20 to connect to). These are vaguely realistic numbers modelled after libera.chat.

So in (B) you have roughly u/n = 2000 clients connected

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#include <assert.h>
#include <errno.h>
#include <libgen.h>
#include <limits.h>
#include <linux/limits.h>
#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>

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# INTRODUCTION

This document specifies the DEPENDS.TXT file for a software project.
This is simply a list of the build time and runtime dependencies of the software.

# SPEC

The file is in TSV (tab separated values) format with UTF-8 encoding, so each line is a record describing a single dependency.

Each record is <package-name>\t<type>\t<version>

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My Markdown Spec

This is (yet) another markdown specification. The purpose of this particular markdown spec is to provide a single unambiguous markdown specification. It aims to use formal regular expressions so that implementors can quickly create implementations (given a regex library) and the results will be consistent across platforms. We specify a very small subset of the markdown seen in the wild.

Version 0.1

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using Gtk;

// valac --pkg gtk+-3.0 mytv.vala

public class MarkupTextView : TextView {
	public void append_text (string s) {
		TextIter end_iter;
		buffer.get_end_iter (out end_iter);
		buffer.insert_with_tags_by_name (ref end_iter, s, -1, null);
	}