Anton, Friendlyantz

Software Engineer, interested in back-end and TDD, AI and CyberSec

14 minute read

Joining @saramic with his 100 Days of Code challange

Fasting, exercising and coding seems like a universal fomula for success and happiness as everythings seems to follow through if you do these 3 simple steps ;D

Day1: PicoW, ESP32, Elixir, Ruby, Flipper Zero, CO2 sensor, Advent of Code, just, mruby

Don’t know where to start with coding - so many exciting ideas and projects, here what I think I will do:

  1. prepere my 1st talk at Ruby /RoRo Melbourne meetup - will start simple - a GitHub user profile repo, but I might overcomplicate things with BDD and emojilanng or …?
  2. try a functional language - already started peaking into Elixir, a sister language to Ruby, which I love
  3. hack my own wifi Network and open my garage door(which key was lost) with a Flippper Zero + ESP32 dev board which I can’t wait to receive very soon. RougeMaster firmware for flipper + Marauder for wifi biz via ESP32 4tw 👾
  4. build CO2 sensor /alarm with Raspberry Pico W
  5. Contribute to a Scientist / Refactorly project
  6. try mruby maybe and flash it on PicoW or esp32?
  7. try just tool - alternative to the glorios make. It seems to be more friendly for beginners in some edge /challanging cases, and why not to try something new? It does not come by default in unix, sorry Mike.
  8. Advent of code - 2021: Continue and hopefully finish; 2022: coming in December, holy gang of musketeers help me

Day 2: Emojicode 🐽

Played for the first time with emojicode - a fun example of an esoteric language:

“…a programming language designed to test the boundaries of computer programming language design, as a proof of concept, as software art, as a hacking interface to another language (particularly functional programming or procedural programming languages), or as a joke.”

Last Ruby Meetup reminded and inspired me to play with it, also ‘hacking’ and it’s error handling sounds like fun🎉🙀

Other languages I was considering were Piet, Shakespeare and Chef - because I love art, literature and cooking 😂

I recon if you are a true and curious engineer - you definetly should play with some esoteric lang.

Emojicode sandbox repo ➡ https://github.com/friendlyantz/emojicode-sandbox

Day3: Kali Nethunter on Android

4hrs of sleep later… it is a day_3 of 100DaysOfCode challange when I am (very)happily back to the Android Termux setting up Kali Nethunter, thanks for inspiration and amazing guide @davidbombal

David’s instructions for rootless version install https://davidbombal.wiki/nhandroid

Kali Nethunter install via Termux NetHunter success Kali NetHunter run

Day 4: Elixir and Erlang install and intro

Day 5: nmap, telnet

Toying with nmap, pwnd my first Hack The Box(HTB) puzzle, using nmap and connecting via open port 23, used by unencrypted telnet protocol

Day 6: nmap, ftp

D6: learn how to probe open ports to determine service/version & OS info with nmap -sV 10.129.0.9

Mac does not have decent cli tool for accessing ftp(or I couldn’t find one quickly). you can connect to FTP via Finder->Go->Connect to Server, but it’s just UI. Other option to use ncftp that loggs use in as anonymous by default

Day 7: nmap, dns, tcp

  • DNS resolvers -> scutil --dns
  • classic lsof lsof -i :9253 -nP -sTCP:LISTEN
  • nslookup google.com - this is simple lookup, but if you need custom ports/etc, you need to go into interactive mode by just nslookup and setting your parms, refer man nslookup
  • Mac sys logs located here (i.e. Puma server logs): tail -f ~/Library/Logs/puma-dev.log

TCP HTB: pwning Redis nmap timing can be boosted -T<0-5>: Set timing template (higher is faster) I believe this is similar to -T paranoid|sneaky|polite|normal|aggressive|insane fastest way was to add couple of more flags, like scan TCP SYN request -sS nmap -v -sV -sS -p T:1009-9999 -T5 0.0.0.0 then connect to Redis redis-cli list keys keys * mget 'yrkey'

Day 8: hacking with flipper

day8 with setting up my new flipper zero device RogueMaster firmware. Esp32 setup coming soon, need windows to run. Exe scripts.

Day 9: sub GHz hacking flipper

day 9 involved a successful hardware hacking of NFC and sub-GHz spectrum. The feeling of joy is priceless, when the script just works as intended after days of research.

Day 9-11: hacking RFID

day 9-11 involved hardware hacking and RTFM on RFID - it is an overwhelming rabbit hole, but less overwhelming than couple of days ago…

Day 12-14: NFC reverse engineering keys from reader intro/rtfm.

Days 12-14: NFC reverse engineering keys from reader intro/rtfm. Aslo SubGhz - main vulnerability - you don’t need to decode, you just need to capture the signal

Day 15: Hardware with PicoW

Back to Pico W Embedded software plaayground: got 2 new boards to replace my cooked picow. Connected to Dev Board I got from Alim which is great and shiny, but I suspect they screwed up wiring for buttons, so the input is 0, and no-input is 1, which we can dance around. Also managed to fire-up oled. Still struggling with CO2 sensor, connecting MicroPython with Adafruit hardware that originally designed for their CircuitPy is not straight forward.

Day 18 - 19 bash scripting

translating your solution is bash syntax is not easy. Learned basic control flow, bit or regex and args handling. I think i might switch to something more useful

Day 20 - 24 exercism

Ruby Exercism - love the mentoring and focusing on perfecting simle problems

Day 25 PostreSQL

CREATE DATABASE test
`\l`

Connect opt 1

psql -h localhost -U friendlyantz -p 5432 test

Connect via SQL / psql

\c test

Delete

DROP DATABASE test;

This is very dangerous

add table

CREATE TABLE test (
  id INT,
  name VARCHAR(30),
  note TEXT,
  dob DATE );

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