What Is Socket Communication?

This section describes the socket communication model on the Internet network. A socket represents one end-point of a two-way communication link between two programs running on the Internet network.

Socket: An concept represents one end-point of a two-way communication link between two programs running on the Internet network.

Internet Address: A unique number to identify each computer system on the Internet.

Port: A number representing an entry point of on a computer system on the Internet, where a two-way communication link can be established.

Local System: The computer system at this end of a two-way communication link.

Remote System: The computer system at the other end of a two-way communication link.

A two-way communication link on the Internet involves:

The following diagram illustrates how an application program can use a socket to talk with other application program running on another computer system through a two-way communication link on the Internet:

Computer System I                            Computer System II

       i/o       |Address a|    Internet    |Address b|       i/o
App. A<--->Socket|Port 1   |<-------------->|   Port 2|Socket<--->App. B

Table of Contents

 About This Book

 Perl on Linux Systems

 ActivePerl on Windows Systems

 Data Types: Values and Variables

 Expressions, Operations and Simple Statements

 User Defined Subroutines

 Perl Built-in Debugger

 Name Spaces and Perl Module Files

 Symbolic (or Soft) References

 Hard References - Addresses of Memory Objects

 Objects (or References) and Classes (or Packages)

 Typeglob and Importing Identifiers from Other Packages

 String Built-in Functions and Performance

 File Handles and Data Input/Output

 Open Files in Binary Mode

 Open Directories and Read File Names

 File System Functions and Operations

 Converting Perl Script to Executable Binary

 Using DBM Database Files

 Using MySQL Database Server

Socket Communication Over the Internet

What Is Socket Communication?

 connect() - Establishing a Socket Communication

 ReverseEchoer.pl - A Simple Socket Server Program

 SocketClient.pl - A Simple Socket Client Program

 gethostbyaddr() - Network Utility Functions

 Socket.pm - The Socket Module

 XML::Simple Module - XML Parser and Generator

 XML Communication Model

 SOAP::Lite - SOAP Server-Client Communication Module

 Perl Programs as IIS Server CGI Scripts

 CGI (Common Gateway Interface)

 XML-RPC - Remote Procedure Call with XML and HTTP

 RPC::XML - Perl Implementation of XML-RPC

 Integrating Perl with Apache Web Server

 CGI.pm Module for Building Web Pages

 LWP::UserAgent and Web Site Testing

 References

 PDF Printing Version