Linux Socket Programming by Example - Warren Gay
CloseLinux Socket Programming by Example
   Table of Contents
  OpenPreface>
   I: Basic Socket Concepts
  Open1. Introducing Sockets
  Open2. Domains and Address Families
  Open3. Address Conversion Functions
  Open4. Socket Types and Protocols
  Open5. Binding Addresses to a Socket
  Open6. Connectionless-Oriented Protocols
  Open7. Connection-Oriented Protocols for Clients
  Open8. Connection-Oriented Protocols for Servers
  Close9. Hostname and Network Name Lookups
    Understanding the Need for Names
    Using the uname(2) Function
    Obtaining Hostnames and Domain Names
    Resolving Remote Addresses
   II: Advanced Socket Programming
  Open10. Using Standard I/O on Sockets
  Open11. Concurrent Client Servers
  Open12. Socket Options
  Open13. Broadcasting with UDP
  Open14. Out-of-Band Data
  Open15. Using the inetd Daemon
  Open16. Network Security Programming
  Open17. Passing Credentials and File Descriptors
  Open18. A Practical Network Project
   Appendixes
  OpenA. Socket Function Quick Reference
  OpenB. Socket-Related Structures Reference
   C. Useful Network Tables
   glossary
   Index
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Chapter 9. Hostname and Network Name Lookups

It is the noon hour and the battle of your morning meetings and issues has been subdued for the moment. The silence of the cubicles is maligned by the rattle of your brown-bag lunch. Your Netscape browser springs to life, after an entire morning of standing by in a minimized state. You tap out a few keystrokes http://206.43.198.67 and press ENTER. Huh?

What's wrong with this picture? It was the IP number 206.43.198.67, wasn't it? After all, what site is that? You likely know this as the site http://www.lwn.net instead, where you get your Linux Weekly News (at least at the time of this writing).

Your associate at work won't ask you to ftp some source code from ftp site 152.2.254.81, will he? Instead, he'll ask you to ftp from sunsite.unc.edu. As you know, IP numbers are simply not easy to remember. In this chapter, you will learn

  • How to determine your local hostname

  • How to resolve a hostname into an IP number

  • How to resolve an IP number into a hostname

Once you have completed this chapter, you will be able to use hostnames or IP numbers in your client and server programs.
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