Book Image

Security with Go

By : John Daniel Leon
Book Image

Security with Go

By: John Daniel Leon

Overview of this book

Go is becoming more and more popular as a language for security experts. Its wide use in server and cloud environments, its speed and ease of use, and its evident capabilities for data analysis, have made it a prime choice for developers who need to think about security. Security with Go is the first Golang security book, and it is useful for both blue team and red team applications. With this book, you will learn how to write secure software, monitor your systems, secure your data, attack systems, and extract information. Defensive topics include cryptography, forensics, packet capturing, and building secure web applications. Offensive topics include brute force, port scanning, packet injection, web scraping, social engineering, and post exploitation techniques.
Table of Contents (15 chapters)

Defer

By deferring a function, it will run whenever the current function is exited. This is a convenient way to ensure that a function will get executed before exiting, which is useful for cleaning up or closing files. It is convenient because a deferred function will get executed no matter where the surrounding function exits if there are multiple return locations.

Common use cases are deferring calls to close a file or database connection. Right after opening a file, you can defer a call to close. This will ensure that a file is closed whenever the function is exited, even if there are multiple return statements and you can't be sure about when and where the current function will exit.

This example demonstrates a simple use case for the defer keyword. It creates a file and then defers a call to file.Close():

package main

import (
"log"
"os"
)

func main...