The Linux socket, TCP/IP protocols and client

My Training Period:  xx hours

 

Note:  Program examples if any, compiled using gcc on Linux Fedora Core 3 machine with several update, as normal user.  The Fedora machine used for the testing having the "No Stack Execute" disabled and the SELinux set to default configuration.

 

The abilities that supposed to be acquired:

• Able to understand the basic of client-server model.

• Able to understand the TCP/IP suite/stack/layer.

• Able to understand important protocols such as TCP and UDP.

• Able to understand and use the Unix/Linux C language socket APIs.

• Able to understand and implement several simple Client and server basic designs.

This Tutorial introduces a network programming using sockets.  Some of the information is implementation specific but all the program examples run on Fedora 3 and compiled using gcc.  The following are topics that will be covered briefly.

• Some Background Story.

• The Client-Server Model.

• Concurrent Processing.

• Programming Interface.

• The Socket Interface.

• Client Design.

• Example Clients.

• Server Design.

• Iterative, Connectionless Servers (UDP).

• Iterative, Connection-Oriented Servers (TCP).

• Concurrent, Connection-Oriented Servers (TCP).

• Single-Process, Concurrent Servers (TCP).

• Multi protocol Servers.

• Multi service Servers.

• Managing Server Concurrency.

• Client Concurrency.

Some Background Story

• This background story tries to introduce the terms used in network programming and also to give you the big picture.

• The following figure is a typical physical network devices connection.

Figure 1