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mveytsman / .bashrc
Last active Apr 11, 2019
Localtunnel replacement
View .bashrc
#hacky way to get a hosts ip
function ipfor() {
ping -c 1 $1 | grep -Eo -m 1 '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}';
# localtunnel replacement (note that I default ssh to port 443 because thats how I roll
localtunnel() { if [ $# -lt 2 ]; then echo "Usage: localtunnel hostname port [ssh_port]"; else ssh_port=${3-443}; echo "Setting up localtunnel on `ipfor $1`"; ssh -N -R "*:0:localhost:$2" $1 -p $ssh_port; fi;}
mveytsman /
Last active Jul 30, 2017
Pedersen commitments
# An implementation of Pedersen Commitments.
# This is like tweeting out a hash of a statement you want to make but better.
# Why is it better?
# 1) If the universe of things you want to commit to is small, an attacker can just hash them to see which one you committed to.
# 2) I'm sure there are other nice security properties but I don't know them yet.
# Learning purposes only, DON'T USE THIS, I have no idea what I'm doing, etc etc
mveytsman /
Last active Jan 18, 2017
Check that your firewall is doing what it should be. Post to slack if it's not.
# This is a script that checks to see if the open ports on a host are what you expect them to be.
# If your firewall isn't doing what it's supposed to, it will post a message to Slack to alert you.
# Intended to be run as a cron job.
# Requires nmap to be installed
# Invoke as
# ./portscanyourself 80 443
# To alert you if any ports other than 80 and 443 are listening on a host
View gist:5e25443b939667860338
View gist:c03eceb1b02e1eeb3903
(defn sierpinsky [n]
(if (= 0 n)
(let [down (sierpinsky (- n 1))
space (apply str (repeat (Math/pow 2 (- n 1)) " "))]
(concat (map #(apply str space % space) down)
(map #(clojure.string/join " " (repeat 2 %)) down)))))
(map println (sierpinsky 4))
mveytsman / expression-problem.clj
Last active Nov 24, 2015
expression problem in clojure
View expression-problem.clj
(ns expression-problem)
;; Shapes have area
(defprotocol Areable
(area [this]))
;; We have circles
(defrecord Circle [radius])
;; Circles have area
mveytsman /
Created Jun 21, 2014
binary search tree in rust
enum BinaryTree {
Node(int, Box<BinaryTree>, Box<BinaryTree>),
fn insert(tree:Box<BinaryTree>, value:int) -> Box<BinaryTree> {
return box match (*tree) {
Leaf => Node(value, box Leaf, box Leaf),
Node(i, left, right) => if value < i {
Node(i, insert(left, value), right)
mveytsman / phonebook.rb
Created Jun 20, 2014
Hacker School Phonebook
View phonebook.rb
#!/usr/bin/env ruby
require 'thor'
class PhoneBookCLI < Thor
no_commands do
def wrap_errors(&block)
instance_eval &block
rescue Exception => e
say "#{e.message}", :red
### Setup a wifi Access Point on Ubuntu 12.04 (or its derivatives).
### make sure that this script is executed from root
if [ $(whoami) != 'root' ]
echo "
This script should be executed as root or with sudo:
sudo $0

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