craig-m’s gists

craig-m / block hosts

Last active November 27, 2020 23:38

methods on linux to block a host/network

	# some methods on *nix systems to block a host/network


	# set a bogus arp address (for IPs in local subnet only)
	arp -s 192.168.1.10 00:00:00:00:00:01


	# blackhole this subnet
	ip route add blackhole 192.168.2.0/24

craig-m / apparmor_uboot.txt

Last active June 30, 2020 05:54

Enable AppArmor in Debian/Ubuntu on BeagleBone and Lime boards

	--------------------------------------------------------------------------------------------------------

	# Enable apparmor in Debian on BeagleBoneBlack. Tested on
	#
	# image: bone-debian-9.5-iot-armhf-2018-10-07-4gb.img
	# system: BeagleBone Black (AM335x 1GHz ARM® Cortex-A8)

	root@beaglebone:~# apt-get install -y apparmor apparmor-utils

	root@beaglebone:~# aa-status

craig-m / slack_mp3_log_post.sh

Created November 27, 2018 02:47

tail a file and post to a slack chan

	#!/bin/bash

	tail -n0 -F "/var/log/mpdscribble/play.log" \| while read LINE; do
	(echo "$LINE" \| grep -e "$3") && curl -X POST --silent --data-urlencode \
	"payload={\"channel\": \"#mp3-play\", \"username\": \"my-jukebox\", \"icon_emoji\": \":speaker:\",\"text\": \"$(echo $LINE \| cut -d " " -f2- \| sed "s/\"/'/g")\"}" "https://hooks.slack.com/services/zz/zz/zz";
	done

craig-m / gist:df4250bd95849581cbcfb9eaf690bb65

Created November 27, 2018 02:44

disable onboard LEDs on beaglebone

sudo sh -c "echo none > /sys/class/leds/beaglebone\:green\:usr0/trigger"

craig-m / ufw_install.sh

Last active December 12, 2018 13:18

simple inbound/outbound UFW for debian linux

craig-m / .screenrc

Created February 8, 2018 02:29

A screenrc file. top bar for info, bottom bar for shell tabs.

	# ~/.screenrc
	#
	# look and feel
	caption always "%{= bb}%{+b w}%h ${USER}@%H %= %c %{=b rw} %l %{= db}%{= dg}"
	hardstatus alwayslastline "%-Lw%{= BW}%50>%n%f* %t%{-}%+Lw%<"
	#
	# skip the startup message
	startup_message off
	#
	# go to home dir

craig-m / gist:714a465d7e7e4ae739ff1311850a9228

Created February 6, 2018 02:04

a setuid c wrapper for /sbin/reboot

	Setuid reboot wrapper script

	The reboot_setuid.c file (11 lines):

	```
	#include <stdio.h>
	#include <stdlib.h>
	#include <sys/types.h>
	#include <unistd.h>

craig-m / gist:0ebb7c70b37436d254858db7dc089c38

Created February 6, 2018 01:58

curl unix socket request

	pi@host:~ $ curl -X GET --unix-socket /opt/path/some.socket http/hello/curltest
	<!DOCTYPE html>
	<html>
	<head>
	<title>Hello from flask</title>
	<link rel="stylesheet" type="text/css" href="/static/style.css">
	</head>
	<body>
	<h1>Hello curltest!</h1>
	</body>

craig-m / hugo_webdev_playbook.yml

Created December 16, 2016 10:47

single page ansible playbook for gohugo.io webdev

	---
	# everything needed for n0de.cloud Hugo web dev
	#
	# $ ansible-playbook webdev_playbook.yml -i localhost

	- name: hugo webdev complete

	hosts: localhost

	connection: local

craig-m / drop_memcache.sh

Created November 22, 2015 10:50

Drop cached memory

	#!/bin/bash
	#
	# Writing to this will cause the kernel to
	# free pagecache, dentries and inodes.
	# This causes that memory to become free.
	#
	# non-destructive & safe for production:
	# ref: https://www.kernel.org/doc/Documentation/sysctl/vm.txt

	freebefore=`free -k \| awk '/^Mem:/{print $4}'`

	#!/bin/bash

	tail -n0 -F "/var/log/mpdscribble/play.log" \| while read LINE; do
	(echo "$LINE" \| grep -e "$3") && curl -X POST --silent --data-urlencode \
	"payload={\"channel\": \"#mp3-play\", \"username\": \"my-jukebox\", \"icon_emoji\": \":speaker:\",\"text\": \"$(echo $LINE \| cut -d " " -f2- \| sed "s/\"/'/g")\"}" "https://hooks.slack.com/services/zz/zz/zz";
	done

C craig-m