U1F30C

Using HTTP over raw TCP with netcat

Netcat HTTP

HTTP Client

Create a minimal raw HTTP request file request.txt. End of line must be CLRF.

GET / HTTP/1.1

U1F30C

Keys management

Generate keys

Instructions for generating and managing cryptographic keys using OpenSSL. These keys are typically used for secure communication, signing, or encryption in various applications.

openssl genrsa -out test_private_key.pem 2048

openssl req -new -x509 -key test_private_key.pem -out test_public_key.pem -subj '/CN=test_key_name'

U1F30C

import { readFile, writeFile } from "fs-safe";
import { DomNode, LinkNode, parse } from "netscape-bookmark-tree";

const bookmarksDir = "data/bookmarks.html";
const outputDir = "data/bookmarks.json";

interface Link<Metadata = any> {
  name: string;
  url: string;
  folder?: string;

U1F30C

// Sources:
// https://en.wikipedia.org/wiki/ID3_algorithm
// https://towardsdatascience.com/decision-trees-for-classification-id3-algorithm-explained-89df76e72df1
// https://brilliant.org/wiki/entropy-information-theory/

// TODO: explicitly specify attribute classes and implement generalization

import { countBy, groupBy, minBy, maxBy } from "lodash";

type Data = string[][];

U1F30C

export interface Dictionary<T> {
  [key: string]: T;
}

interface DisjointSetElement {
  key: string;
  parent?: DisjointSetElement;
  children: DisjointSetElement[];
}

U1F30C

/**
 * Definition for a binary tree node.
 * class TreeNode {
 *     val: number
 *     left: TreeNode | null
 *     right: TreeNode | null
 *     constructor(val?: number, left?: TreeNode | null, right?: TreeNode | null) {
 *         this.val = (val===undefined ? 0 : val)
 *         this.left = (left===undefined ? null : left)
 *         this.right = (right===undefined ? null : right)

U1F30C

# to know the right version use
# cat /etc/os-release
# node --version

FROM node:14-buster as build
WORKDIR /app
COPY . ./

RUN npm i

U1F30C

function piStep(n) {
  return (
    (
        Math.pow(-1, n)
        / (2 * n + 1)
    )
    * (
        4 / Math.pow(5, 2 * n + 1)
        - 1 / Math.pow(239, 2 * n + 1)
    )

U1F30C

Converting shapefiles to geojson

####Assumptions

• QGIS installed (if not: http://qgis.com/)

Get the data

We will use the Electoral District and Polling Division shapefiles found on the Elections Ontario site:

U1F30C

Goals

• Can use Ubuntu Server 20.04 LTS to be Router Gateway include DHCP Server
• Client who connected to Ubuntu Server can be access Internet

Environement

• Ubuntu 20.04 LTS
• 2 Interface
  • 1 Interface from WAN / ISP (enp2s0)
  • 1 Interface for distribution clients (enx00e04c534458)