rushilgupta

INTRO

Concurrency is a domain I have wanted to explore for a long time because the locks and the race conditions have always intimidated me. I recall somebody suggesting concurrency patterns in golang because they said "you share the data and not the variables".

Amused by that, I searched for "concurrency in golang" and bumped into this awesome slide by Rob Pike: https://talks.golang.org/2012/waza.slide#1 which does a great job of explaining channels, concurrency patterns and a mini-architecture of load-balancer (also explains the above one-liner).

Let's dig in:

Goroutines

dossy

/*
https://play.golang.org/p/3g50cX2ed-

Output looks like:

&main.Node{XMLName:xml.Name{Space:"", Local:"foo"}, Comments:" a  b ", Attrs:[]xml.Attr(nil), Value:"", Children:[]main.Node{main.Node{XMLName:xml.Name{Space:"", Local:"bar"}, Comments:"", Attrs:[]xml.Attr{xml.Attr{Name:xml.Name{Space:"", Local:"baz"}, Value:"bing"}}, Value:"", Children:[]main.Node(nil)}}}
*/

package main

zubaer-ahammed

Reset mysql root password in Mac OS:

First Stop MySQL:

1. Go to: 'System Preferences' >> 'MySQL' and stop MySQL

OR,

1. sudo /usr/local/mysql/support-files/mysql.server start
2. sudo /usr/local/mysql/support-files/mysql.server stop

VertigoRay

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

source /etc/network/interfaces.d/*

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface

itzg

Here is how to create a cloud-init disk image and OS disk image suitable for configuring into a libvirt domain file.

In my case I am naming my domain (a.k.a. virtual machine or VM) xenial with a static IP address of 192.168.0.101. The filenames "network-config" and "user-data" files are arbitrary, so they can be named with a prefix for the domain, etc.

First, get the cloud image and convert into QCOW2 format:

qemu-img convert -O qcow2 xenial-server-cloudimg-amd64-disk1.img xenial-server-cloudimg-amd64-disk1.qcow2

montanaflynn

package main

import (
	"fmt"
	"net/http"
	"sort"
	"time"
)

// a struct to hold the result from each request including an index

rchrd2

<?php
function require_auth() {
	$AUTH_USER = 'admin';
	$AUTH_PASS = 'admin';
	header('Cache-Control: no-cache, must-revalidate, max-age=0');
	$has_supplied_credentials = !(empty($_SERVER['PHP_AUTH_USER']) && empty($_SERVER['PHP_AUTH_PW']));
	$is_not_authenticated = (
		!$has_supplied_credentials ||
		$_SERVER['PHP_AUTH_USER'] != $AUTH_USER ||
		$_SERVER['PHP_AUTH_PW']   != $AUTH_PASS

jkullick

Prerequirements

Connect to Host via SSH with tunneled ports:

ssh $USER@$HOST -L 5910:localhost:5910 -L 5911:localhost:5911

Whonix Gateway

1. Download & Extract Whonix Gateway:

ammario

func ip2int(ip net.IP) uint32 {
	if len(ip) == 16 {
		return binary.BigEndian.Uint32(ip[12:16])
	}
	return binary.BigEndian.Uint32(ip)
}

func int2ip(nn uint32) net.IP {
	ip := make(net.IP, 4)
	binary.BigEndian.PutUint32(ip, nn)

wido

<filter name='network_filter_1' chain='ipv4' priority='-700'>
  <uuid>64b80046-9a9d-40c2-8782-ed5878146262</uuid>

  <rule action='drop' direction='out' priority='500'>
    <mac match='no' srcmacaddr='52:54:00:01:ad:9d'/>
  </rule>

  <rule action='return' direction='out' priority='500'>
    <ip srcipaddr='192.168.100.101'/>
  </rule>