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C Programming
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this programming assignment is to familiarize you with network programming in the environment to be used in the class and to acquaint you with the procedure for handing in machine problems.

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Programming Assignment 1: HTTP Client

The purpose of this programming assignment is to familiarize you with network programming in the environment to be used in the class and to acquaint you with the procedure for handing in machine problems. The problem is intended as an introductory exercise to test your background in C programming. You will write, compile and run a simple network program. You will also implement an http client program which will familiarize you with the employment of a protocol for network communication. For this assignment, you will work on the virtual machine provided. The instructions for installing the virtual machine can be found in the handout named “VM installation instructions”

VM Installation Instructions.pdfPDF File

Task 0: Socket-Oriented Programming (Optional)

This step is optional, it requires no coding and it is intended for you to get familiar with compiling and testing network applications on Linux machines. If you have already coded a network application in C, feel free to skip to the next section.

You will find a folder named MP0, which contains the programs client.c, server.c, talker.c, andlistener.c from Beej’s Guide to Network Programming, also available at:

http://beej.us/guide/bgnet/

Figure out what these programs are supposed to accomplish. Reading Beej’s guide itself is of course very helpful, if you can tolerate his sense of humor. Compile the files using the GNU C compiler to create the executable files client, server, talker, and listener. For example, to create the executable file client you’d execute:

gcc -o client client.c

Learn how to use the make command. The file Makefile in your assignment folder is configured to compile the example code provided:

make client make server make talker

make listener

compile the single programs, while make all

compiles all of them. make clean

reverts the folder to its original state by removing any file created by previous calls to make.

Once you have compiled the code, open two terminal windows, and execute client in one and server in the other. This makes a TCP connection. Execute talker in one terminal and listener in the other. This sends a UDP packet. Note that the connection-oriented pair, server and client, use a different port than the datagram-oriented pair, listener and talker. Try using the same port for each pair. Do the pairs of programs interfere with each other? Why?

 

Task 1: HTTP Client

In this task, you will implement a simple HTTP client. The client should be able to GET correctly from standard web servers.

HTTP uses TCP – you can use Beej's client.c and server.c as a base.

HTTP communication Basics:

 

  • The client sends an HTTP get request to the

  • The server replies with a response based on the request of the client (e.g. acknowledge the validity of the request with an OK response OR reply with a file not found error response ).

  • Based on the response from the server, the client takes further action (e.g. store the message content in a file OR redirect to a different address with a new GET request )

Details on HTTP GET Request

Here's the very simple HTTP GET request generated by wget: GET /test.txt HTTP/1.0

User-Agent: Wget/1.15 (linux-gnu) Accept: */*

Host: localhost:3490 Connection: Keep-Alive

  • GET /test.txt instructs the server to return the file called test.txt in the server's top-level web directory.

  • Accept specifies what types of files are desired – the client could say “I only want audio”, or “I want text, and I prefer html text”, etc. In this case it is saying “anything is fine”.

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