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Hands-On Network Programming with C

You're reading from Hands-On Network Programming with C

Product type Book

Published in May 2019

Publisher Packt

ISBN-13 9781789349863

Pages 478 pages

Edition 1st Edition

Languages

Concepts

Author (1):

Lewis Van Winkle

Table of Contents (26) Chapters

Title Page

Dedication

About Packt

Contributors

Preface

1. Introducing Networks and Protocols

2. Getting to Grips with Socket APIs

3. An In-Depth Overview of TCP Connections

4. Establishing UDP Connections

5. Hostname Resolution and DNS

6. Building a Simple Web Client

7. Building a Simple Web Server

8. Making Your Program Send Email

9. Loading Secure Web Pages with HTTPS and OpenSSL

10. Implementing a Secure Web Server

11. Establishing SSH Connections with libssh

12. Network Monitoring and Security

13. Socket Programming Tips and Pitfalls

14. Web Programming for the Internet of Things

1. Answers to Questions

2. Setting Up Your C Compiler on Windows

3. Setting Up Your C Compiler on Linux

4. Setting Up Your C Compiler on macOS

5. Example Programs

6. Other Book You May Enjoy

Leave a review - let other readers know what you think

Index

Email servers

SMTP is the protocol responsible for delivering emails between servers. It is a text-based protocol operating on TCP port 25.

Not all emails need to be delivered between systems. For example, imagine you have a Gmail account. If you compose and send an email to your friend who also has a Gmail account, then SMTP is not necessarily used. In this case, Gmail only needs to copy your email into their inbox (or do equivalent database updates).

On the other hand, consider a case where you send an email to your friend's Yahoo! account. If the email is sent from your Gmail account, then it's clear that the Gmail and Yahoo! servers must communicate. In that case, your email is transmitted from the Gmail server to the Yahoo! server using SMTP.

This connection is illustrated in the following diagram:

Retrieving your email from your mail service provider is a different issue than delivering email between service providers. Webmail is very popular now for sending and receiving mail from your...

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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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