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)

TCP and UDP sockets

Sockets are the building blocks of networking. Servers listen and clients dial using sockets to bind together and share information. The Internet Protocol (IP) layer specifies the address of a machine, but the Transmission Control Protocol (TCP) or the User Datagram Protocol (UDP) specify which port on the machine should be used.

The main difference between the two is the connection state. TCP keeps the connection alive and verifies that messages are received. UDP just sends a message off without receiving an acknowledgement from the remote host.

Creating a server

Here is an example server. The tcp argument for net.Listen() can be changed to udp if you want to change protocol:

package main

import (