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You're reading from Hands-On Network Programming with C Learn socket programming in C and write secure and optimized network code

Product type Paperback

Published in May 2019

Publisher Packt

ISBN-13 9781789349863

Length 478 pages

Edition 1st Edition

Languages

Tools

HTTP

Concepts

Networking

Author (1):

Lewis Van Winkle

View More author details

Table of Contents (25) Chapters

Preface

1. Section 1 - Getting Started with Network Programming FREE CHAPTER

2. Introducing Networks and Protocols

3. Getting to Grips with Socket APIs

4. An In-Depth Overview of TCP Connections

5. Establishing UDP Connections

6. Hostname Resolution and DNS

7. Section 2 - An Overview of Application Layer Protocols

8. Building a Simple Web Client

9. Building a Simple Web Server

10. Making Your Program Send Email

11. Section 3 - Understanding Encrypted Protocols and OpenSSL

12. Loading Secure Web Pages with HTTPS and OpenSSL

13. Implementing a Secure Web Server

14. Establishing SSH Connections with libssh

15. Section 4 - Odds and Ends

16. Network Monitoring and Security

17. Socket Programming Tips and Pitfalls

18. Web Programming for the Internet of Things

19. Answers to Questions

20. Setting Up Your C Compiler on Windows

21. Setting Up Your C Compiler on Linux

22. Setting Up Your C Compiler on macOS

23. Example Programs

24. Other Book You May Enjoy

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Hostname Resolution and DNS

Hostname resolution is a vital part of network programming. It allows us to use simple names, such as www.example.com, instead of tedious addresses such as ::ffff:192.168.212.115. The mechanism that allows us to resolve hostnames into IP addresses and IP addresses into hostnames is the Domain Name System (DNS).

In this chapter, we begin by covering the built-in getaddrinfo() and getnameinfo() socket functions in more depth. Later, we will build a program that does DNS queries using User Datagram Protocol (UDP) from scratch.

We will cover the following topics in this chapter:

How DNS works
Common DNS record types
The getaddrinfo() and getnameinfo() functions
DNS query data structures
DNS UDP protocol
DNS TCP fallback
Implementing a DNS query program

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Authors (1)

Lewis Van Winkle

Lewis Van Winkle is a software programming consultant, entrepreneur, and founder of a successful IoT company. He has over 20 years of programming experience after publishing his first successful software product at age 12. He has over 15 years of programming experience with the C programming language on a variety of operating systems and platforms. He is active in the open-source community and has published several popular open-source programs and librariesmany of them in C. Today, Lewis spends much of his time consulting, where he loves taking on difficult projects that other programmers have given up on. He specializes in network systems, financial systems, machine learning, and interoperation between different programming languages.

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