COMP2881 : Sockets Simplex vs Duplex  Connections and Network Protocols – Computer Science Assignment Help

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Assignment Task :

Objectives  

Upon completing this lab, you should be able to:  

• Demonstrate an understanding of Computer Network concepts; IP addresses, sockets, simplex vs duplex  connections, network protocols 

• Demonstrate you are able to develop programs in the UNIX environment in C 

• Demonstrate you are able to articulate user program design choices in terms of; security, efficiency,  performance, or other relevant requirements 

 

Learning out comes; 

• LO1: Understand computer network terminology and topologies, functions and architectures of computer  networks  

• LO2: Demonstrate the design and implementation of simple process and network level programs 

• LO3: Demonstrate an understanding of the various layers which make up networks and how they are  used to form complex, reliable and secure communication mediums  

• LO4: Understand and be able to articulate the structure and function of the major types of networks in  common use  

• LO5: Understand aspects of the internet, including various associated protocols IP, UDP, TCP, IP  addressing, header fields and the operation of servers / clients  

• LO6: Appreciate the real-time nature of networked devices and communications and demonstrate an  understanding of current and emerging methods for secure information transfer

 

Task 1  

Modify the provided IP/TCP server code to provide a service like HTTP.  

The purpose of this service is to provided a mechanism to move files over a data stream service.  Document each step in your implementation, marks will be allocated to informative commentary on what  the code is doing. 

The server should; 

• Use a port number provided by an argument to getopt(), check it is between 40000-59999 • Create a socket on the provided port number 

• Listen on the socket 

• Wait to accept incoming file requests 

• Open the local file, obtain the file size from stat() 

• Respond by sending back the valid file name, and the file size or 

• If file does not exist, print status of “Failed”, close connection (see example below), skip to Sleep • Wait for the client to respond with the valid file size 

• Respond by sending the file contents to the client 

• Wait for the client to respond with “OK” or “Failed”

 

Task 2  

Modify the provided IP/TCP client code to provide a test program to test the above server. Use two separate sub-directories, one for the server, another for the client.  

Run each in their own terminals and respective directories so that it is obvious that the file is transferred. While test are supposed to be self documenting, please use meaningful messages in your tests. 

 

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