Book Image

Hands-On Network Programming with C

By : Lewis Van Winkle
Book Image

Hands-On Network Programming with C

By: Lewis Van Winkle

Overview of this book

Network programming enables processes to communicate with each other over a computer network, but it is a complex task that requires programming with multiple libraries and protocols. With its support for third-party libraries and structured documentation, C is an ideal language to write network programs. Complete with step-by-step explanations of essential concepts and practical examples, this C network programming book begins with the fundamentals of Internet Protocol, TCP, and UDP. You’ll explore client-server and peer-to-peer models for information sharing and connectivity with remote computers. The book will also cover HTTP and HTTPS for communicating between your browser and website, and delve into hostname resolution with DNS, which is crucial to the functioning of the modern web. As you advance, you’ll gain insights into asynchronous socket programming and streams, and explore debugging and error handling. Finally, you’ll study network monitoring and implement security best practices. By the end of this book, you’ll have experience of working with client-server applications and be able to implement new network programs in C. The code in this book is compatible with the older C99 version as well as the latest C18 and C++17 standards. You’ll work with robust, reliable, and secure code that is portable across operating systems, including Winsock sockets for Windows and POSIX sockets for Linux and macOS.
Table of Contents (26 chapters)
Title Page
About Packt

Network security

Network security encompasses the tools, techniques, and practices to protect a network from threats. These tools include both hardware and software and can protect against a variety of threats.

Although the topic is too broad for much detail here, we will cover a few topics that you are likely to encounter.

Firewalls are one of the most common network security techniques. Firewalls act as a barrier between one network and another. As commonly used, they monitor network traffic and allow or block traffic based on a defined set of rules.

Firewalls come in two types: software and hardware. Most operating systems provide software firewalls now. Software firewalls are typically configured to deny incoming connections unless a rule is set up to allow it explicitly.

It is also possible to configure software firewalls to deny outgoing traffic by default. In this case, programs aren't allowed to establish new connections unless a specific rule is added to the firewall configuration first...