zouppen

zouppen

Advent of code 2022 epic häx

Zouppen is not trying to solve 'em all but just show some epic overoptimized stuff.

zouppen

Command-line tool to convert Lightning Address to LN invoice

Usage:

lnaddress user@example.com 1000 "Thanks a lot!"

Probably not 100% compliant with LUDS but should almost fulfill LUD-01, LUD-06, and LUD-12.

zouppen

Block Tor exit nodes with Linux and ipset

This gist blocks incoming traffic from Tor exit nodes. You can also use it to MARK or redirect the incoming traffic, depending of your needs.

This guide is for IPv4 only, feel free to contribute IPv6 support if you have it.

Installing

zouppen

Raspberry Pi overheating protection

If your Raspberry Pi is overheating, a common solution is to add a fan. Sometimes it's not feasible and in most cases the computer is runnning smoothly without a fan.

To limit heating, CPU throttling is a solution which keeps your computer not crashing during long compiles or so, but gives out the peak performance for shorter period of times. It depends of your application, if this is good enough solution. For me it is. I like my

zouppen

TOTP (Google Authenticator) support in shell scripts

Here is a POSIX shell compliant TOTP validator.

Requires oathtool which is available from Debian / Ubuntu repositories and probably many other distros as well.

zouppen

How to setup a minimal diskless Debian (year 2022 style)

This guide helps you to setup a minimal stateless and diskless Debian initramfs with debootstrap. It is suitable for running from QEMU or network booting with (e.g. with iPXE).

This guide is for amd64 architecture.

Motivation

zouppen

#!/bin/sh -eu
export ydin=`uname -r`
export os=`uname`
lspci | jq -Rs '{os: env.os, ver: env.ydin, laitteet: split("\n") | map(capture("^[^ ]* (?<key>[^:]*): (?<value>.*)$") ) | from_entries}'

zouppen

GPIO interrupt polling

This useful little tool checks for changes in GPIO state without periodic polling by using the interrupt interface provided by Linux. It's useful in scripts to wait for a state change with Raspberry Pi, but works with any hardware with GPIOs.

Public domain.

To make this work, you need to export the pin and then enable interrupts. For example:

zouppen

# Write all addresses containing 0.1 BTC to file
with open('/tmp/addresses.txt', 'w') as f:
  f.write("\n".join([addr for addr in listaddresses() if wallet.get_addr_balance(addr)[0] == 10000000]))

# List all coins having balance of 0.1, with label starting with letter L containing transactions between blocks 395000 and 400350, inclusive.
[addr for addr in listaddresses() if wallet.get_addr_balance(addr)[0] == 10000000 and wallet.get_label(addr)[0] == 'L' and any([tx[1] >= 395000 and tx[1] <= 400350 for tx in wallet.get_address_history(addr)])]