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

Socket functions

The socket APIs provide many functions for use in network programming. Here are the common socket functions that we use in this book:

  • socket()creates and initializes a new socket.
  • bind() associates a socket with a particular local IP address and port number.
  • listen() is used on the server to cause a TCP socket to listen for new connections.
  • connect() is used on the client to set the remote address and port. In the case of TCP, it also establishes a connection.
  • accept() is used on the server to create a new socket for an incoming TCP connection.
  • send() and recv() are used to send and receive data with a socket.
  • sendto() and recvfrom() are used to send and receive data from sockets without a bound remote address.
  • close() (Berkeley sockets) and closesocket() (Winsock sockets) are used to close a socket. In the case of TCP, this also terminates the connection.
  • shutdown() is used to close one side of a TCP connection. It is useful to ensure an orderly connection teardown.
  • select() is used...