oakwhiz

#!/usr/bin/env python3
import sqlite3
import struct
from pathlib import Path
import argparse
from hashlib import sha256
from time import time

# Install these packages via pip if not already installed
from ecdsa.numbertheory import square_root_mod_prime

oakwhiz

How to set up a bitcoin node on Debian using the official "hardened" systemd unit file, with external storage + testnet

Disclaimer of liability & warnings

It's your responsibility to handle Bitcoin correctly, failure to do so could cause cybersecurity breaches or financial losses, which you are solely responsible for. You should change all passwords, ensure you have a good firewall configuration, keep up-to-date, only use trusted sources for software and configuration, maintain your hardware, ensure working backups and redundancies, etc. You must also double check that these documents are not outdated, malicious or tampered with. The author(s) of these documents cannot be held responsible for losses or damages arising from use or misuse of the information within.

If you are using a bitcoin node in a commercial setting, you need to think about things like redundancy, uptime and recovery. What would happen if you were relying on a single bitcoin node and it went down? How long will it last if you "set it

oakwhiz

Gigabyte GA-990FXA-UD3 revision 4.0

IOMMU enabled

Linux 3.13

Problem:

VIA USB 3.0 controller doesn't work in Linux. The AMD IOMMU is enabled in the BIOS. Checking kernel messages (dmesg) shows that the USB controller is shut down due to an error, and there are also many error messages pertaining to AMD-Vi and access to a certain memory address through the IOMMU. Some USB ports do not work.

oakwhiz

How to configure crond to send cron job output to the system journal

Keywords: fedora 20, systemd, cron, crond, output, stdout, journal

Problem: You want to capture and read the output of your cron jobs, but the output isn't being logged anywhere.

Solution: Add an argument to crond.

oakwhiz

# START
from mpmath import mp
import numpy as np
import matplotlib.pyplot as plt
import cmath

# Set the desired precision
mp.dps = 50

# Define the angles of the fundamental domain

oakwhiz

# jul/28/2022 00:34:21 by RouterOS 7.4rc2
# incomplete config, do not use directly

/ip firewall address-list
add address=192.168.88.0/24 list=local
add address=192.168.88.0/24 list=preferprimary
add address=1.2.3.0/24 list=localnet-primary
add address=4.5.6.0/24 list=localnet-backup
add address=9.9.9.10 list=reserved-main
add address=9.9.9.11 list=reserved-isp1

oakwhiz

from __future__ import division
from random import uniform

from pyglet import clock, font, image, window
from pyglet.gl import *

class glBeginEnd:
    def __init__(self, gl_enum):
        self.gl_enum = gl_enum
    def __enter__(self):

oakwhiz

#![feature(thread_sleep, std_misc)]

extern crate winapi;
extern crate "kernel32-sys" as kernel32;
extern crate "user32-sys" as user32;

fn main() {
    println!("About to hide the console.");
    sleep(1);
    unsafe {

oakwhiz

REM precache files into windows disk cache
REM first argument should be the name of a folder
REM all the files will be recursively copied to nul in order to put them in the disk cache

FOR /R %1 %%F IN (*) DO copy /b "%%F" nul

oakwhiz

#!/bin/sh

# Tunnel SSH over Layer 2 Ethernet (rough sketch)
# requires FIFOs, netcat, linkcat

testfun () {
 read line
 nc "${@}" < <(echo $line ; cat)
}