Book Image

Hands-On Network Programming with C# and .NET Core

By : Sean Burns
Book Image

Hands-On Network Programming with C# and .NET Core

By: Sean Burns

Overview of this book

The C# language and the .NET Core application framework provide the tools and patterns required to make the discipline of network programming as intuitive and enjoyable as any other aspect of C# programming. With the help of this book, you will discover how the C# language and the .NET Core framework make this possible. The book begins by introducing the core concepts of network programming, and what distinguishes this field of programming from other disciplines. After this, you will gain insights into concepts such as transport protocols, sockets and ports, and remote data streams, which will provide you with a holistic understanding of how network software fits into larger distributed systems. The book will also explore the intricacies of how network software is implemented in a more explicit context, by covering sockets, connection strategies such as Transmission Control Protocol (TCP) and User Datagram Protocol (UDP), asynchronous processing, and threads. You will then be able to work through code examples for TCP servers, web APIs served over HTTP, and a Secure Shell (SSH) client. By the end of this book, you will have a good understanding of the Open Systems Interconnection (OSI) network stack, the various communication protocols for that stack, and the skills that are essential to implement those protocols using the C# programming language and the .NET Core framework.
Table of Contents (26 chapters)
Free Chapter
1
Section 1: Foundations of Network Architecture
6
Section 2: Communicating Over Networks
10
Section 3: Application Protocols and Connection Handling
15
Section 4: Security, Stability, and Scalability
21
Section 5: Advanced Subjects

What is SSH?

Starting from the beginning, the first step to understanding how we can leverage SSH in our software is to understand what SSH is, and how it works. Put simply, SSH is a network protocol for securely logging into a remote host. Once that remote login has been established, the protocol supports executing and operating remote resources over an otherwise unsecured network. As with all of the protocols we've explored throughout this book, its design is intentionally generalized for use in a wide variety of contexts. So, how did it begin, and how, specifically, does it work?

The origin of SSH

Originally created in 1995 by Finnish researcher Tatu Ylönen, SSH was created to provide a secure channel over which...