s4eidhp’s gists

s4eidhp / wav_format.md

Created November 14, 2024 15:09

Wave audio format

Developed by Microsoft and has become one of the primary formats of uncompressed audio
A file can have multiple combinations of header and data, though many files just have one header and one data section.

s4eidhp / esp32_bare_metal.md

Last active November 12, 2024 07:28

    Install required packages
sudo apt-get install git wget flex bison gperf python3 python3-pip python3-venv cmake \
                     ninja-build ccache libffi-dev libssl-dev dfu-util libusb-1.0-0
Get esp-idf
git clone --recursive https://github.com/espressif/esp-idf.git

  

s4eidhp / lpi_notes.md

Last active November 9, 2024 11:17

Linux Programming Interface

CHAPTER 2

Kernel Tasks:
- Process Schedulling
- Memory Managment
- Provision of a file system
- Creation and termination of processes
- Access to devices
- Networking
Provision of a system call application programming interface (API)

s4eidhp / win_ssh_key_pair.md

Last active November 1, 2024 09:00

SSH into Windows using Key Authentication

Install OpenSSH Server on remote machine
Set OpenSSH Authentication Agent service & OpenSSH Server service to start automatically
Start both services
Edit C:\ProgramData\ssh\sshd_config file

PubKeyAuthentication      yes
PasswordAuthentication    no
# Match group admin ...
# Authorized key file ...

s4eidhp / build_minimal_img_rpi02w.md

Last active October 12, 2024 10:06

Toolchain

cd ~
git clone https://github.com/crosstool-ng/crosstool-ng.git  
cd crosstool-ng 
git checkout crosstool-ng-1.26.0        # currently latest stable version
./bootstrap
./configure --prefix=${PWD}
make
make install

s4eidhp / x64_assembly_linux.md

Last active October 16, 2024 13:35

Assembly Language and Shellcode for x86_64

Compilation process

hello.c -> hello.i -> hello.s -> hello.o + some other object files -> hello.exe

Findout CPU arch

lscpu

s4eidhp / gdb_notes.md

Created October 12, 2024 08:21

GNU Debugger Megaprimer

Find binary file info (if debug symbols exist)

info functions
info variables              # for global variables
info registers              # inspect CPU registers
info scope <scope_name>     # for local variables

s4eidhp / build_linux_kernel.md

Created October 12, 2024 08:18

How to build

install dependencies

sudo apt install build-essential libncurses-dev bison flex libssl-dev libelf-dev fakeroot dwarves

download latest kernel from kernel.org in tarball format and extract it

wget https://cdn.kernel.org/pub/linux/kernel/v6.x/linux-6.9.9.tar.xz
tar -xf linux-6.9.9.tar.xz
rm linux-6.9.9.tar.xz

s4eidhp / offline_package_installation.md

Last active October 12, 2024 08:47

How to install a package on a machine which does not have internet access?

Steps

download apt-offline .deb package file from https://packages.ubuntu.com and transfer it to offline machine
install apt-offline

sudo dpkg -i apt-offline_<version>_all.deb

s4eidhp / yt_dlp_installation.md

Last active October 12, 2024 08:19

Steps on Linux server

download appropriate executable from github release page or build it from source using project instructions
install ffmpeg on system to download best quality of videos (for more information see this post)
download browser cookies using firefox or chrome extension and copy it on the server
use --cookies flag to pass cookies file to the yt-dl

./yt-dlp --cookies cookies.txt <video_link>

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