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)

Decoding packets faster

If we know what layers to expect, we can use existing structures to store the packet information instead of creating new structs for every packet that takes time and memory. It is faster to use DecodingLayerParser. It is like marshaling and unmarshaling data.

This example demonstrates how to create layer variables at the beginning of the program and reuse the same variables over and over instead of creating new ones for each packet. A parser is created with gopacket.NewDecodingLayerParser(), which we provide with the layer variables we want to use. One caveat here is that it will only decode the layer types that you created initially.

The following is the code implementation of this example:

package main

import (
"fmt"
"github.com/google/gopacket"
"github.com/google/gopacket/layers"
"github.com/google/gopacket/pcap...