lancejpollard

wildcard DNS in localhost development

• install dnsmasq

$ brew install dnsmasq
   ...
$ cp /usr/local/opt/dnsmasq/dnsmasq.conf.example /usr/local/etc/dnsmasq.conf

• edit /usr/local/etc/dnsmasq.conf

address=/local/127.0.0.1

lancejpollard

/**
 * Add two bits together and get resulting bits
 * 
 * @param {Number} a bit a 
 * @param {Number} b bit b
 * @returns {Array<Number, Number>} Carry and sum as a result of addition
 */
function addBits(a, b){
    return [ +( a && b ), +( a !== b ) ];

lancejpollard

        page    ,132
        title   memcpy - Copy source memory bytes to destination
;***
;memcpy.asm - contains memcpy and memmove routines
;
;       Copyright (c) Microsoft Corporation. All rights reserved.
;
;Purpose:
;       memcpy() copies a source memory buffer to a destination buffer.
;       Overlapping buffers are not treated specially, so propogation may occur.

lancejpollard

/* chacha20 - 256 bits */

// Written in 2014 by Devi Mandiri. Public domain.
//
// Implementation derived from chacha-ref.c version 20080118
// See for details: http://cr.yp.to/chacha/chacha-20080128.pdf

function U8TO32_LE(x, i) {
  return x[i] | (x[i+1]<<8) | (x[i+2]<<16) | (x[i+3]<<24);
}

lancejpollard

#include <arpa/inet.h>
#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include <unistd.h>

int main() {
	const char* server_name = "localhost";
	const int server_port = 8877;

lancejpollard

/* Include the sbrk function */
#include <unistd.h>

int has_initialized = 0;
void *managed_memory_start;
void *last_valid_address;

void malloc_init() { /* grab the last valid address from the OS*/
  last_valid_address = sbrk(0);
  /* we don't have any memory to manage yet, so

lancejpollard

Understanding the Memory Layout of Linux Executables

Required tools for playing around with memory:

• hexdump
• objdump
• readelf
• xxd
• gcore

lancejpollard

Introduction to the Unix Curses Library

Norman Matloff

Department of Computer Science

University of California at Davis

c 1997-2011, N. Matloff April 8, 2011

Contents

1 History 2 1.1 Purpose of the Curses Library 1.2 Evolution of the Role of Curses

lancejpollard

#include <sys/socket.h>
#include <sys/un.h>
#include <sys/event.h>
#include <netdb.h>
#include <assert.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdio.h>
#include <errno.h>

lancejpollard

'use strict';

const crypto = require('crypto');

const ENCRYPTION_KEY = process.env.ENCRYPTION_KEY; // Must be 256 bytes (32 characters)
const IV_LENGTH = 16; // For AES, this is always 16

function encrypt(text) {
  let iv = crypto.randomBytes(IV_LENGTH);
  let cipher = crypto.createCipheriv('aes-256-cbc', new Buffer(ENCRYPTION_KEY), iv);