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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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Chapter 8, Making Your Program Send Email

What port does SMTP operate on?

SMTP does mail transmission over TCP port 25. Many providers use alternative ports for mail submission.

How do you determine which SMTP server receives mail for a given domain?

The mail servers responsible for receiving mail for a given domain are given by MX-type DNS records.

How do you determine which SMTP server sends mail for a given provider?

It's not possible to determine that in the general case. In any case, several servers could be responsible. Sometimes these servers will be listed under a TXT-type DNS record using SPF, but that is certainly not universal.

Why won't an SMTP server relay mail without authentication?

Open relay SMTP servers are targeted by spammers. SMTP servers require authentication to prevent abuse.

How are binary files sent as email attachments when SMTP is...

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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.

See other products by Lewis Van Winkle