Computer Networks-C Programming

Instructions: Compile the C programs in one of the CSE (cse01 – cse06) servers and make sure it’s working. Comment your code. Create a Makefile to compile the source code and to clean the binaries. Create a readme file that describes how to compile, execute, and test the code. Create an assignment folder with folder name as euid_PA2 (example: xyz0202_PA2) and add all the source files, Makefile, and the readme file to the folder. Please create a zip archive of your assignment folder and upload the zip file to Canvas.  Not following the above instructions could result in not accepting your programming assignment. Late submissions are not allowed.

 

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Objective:

Create a web proxy server that can be connected by a single client and would only allow http requests. The proxy server should be able to cache up to six recent websites.

Requirements:

1. Create a C-based proxy server and a client using TCP sockets

2. The proxy server should be able to accept and service single client’s http requests

3. The proxy server should be able to process the client’s request and forward the response to the client

4. The proxy server should run on cse02.cse.unt.edu machine and the client should run on cse03.cse.unt.edu machine

5. The proxy server should be able to cache at least six (6) recent requested webpages, if available

6. When a http request is made to a website that is cached, the proxy server should return the cached page.

Procedure:

1. Create a C-based server that can accept single client’s request using TCP sockets

2. The created proxy server should also be able to process the client HTTP request

3. Make sure the proxy server runs on cse02.cse.unt.edu and the format to start the proxy server as follows

./pyserver <port_number>

where pyserver is the proxy server executable and port_number is the port number on which the proxy server listens

4. Create a C-based client that can connect to the proxy server using TCP sockets

5. Make sure the client runs on cse03.cse.unt.edu and connects to the proxy server. The user can request the desired web page using the below format

./client <port_number>

url: <url>

where client is the client executable, port_number is the port number on which the client connects the server and url is the requested url starting with www

6. Once the proxy server gets a request from the client, it checks the cache for the requested page. If the page is not found in the cache, then it forwards the request to the web server. Figure 1 shows the overall architecture

7. The proxy server checks for the response from the web server

8. If the HTTP response is 200, the returned web page from the web server is cached in the proxy server. The proxy server stores the webpage in a file and assigns a filename based on the time of visit. The filename format is YYYYMMDDhhmmss. Where YYYY is the year, MM is the month, DD is the day, hh is the hour in 24-hour format, mm is the minutes, and ss is the seconds when the website was visited

9. A list file (list.txt) is created which stores the URL of the webpage and the associated cached web page filename

10. The list file stores six (6) recent URLs. The cached websites that are not listed in the list file should be deleted from the list file and the cache

11. Once the returned web page is cached, the web page is forwarded to the client. Verify to see if the returned page is same as the browser returned page.

12. If the HTTP response is not 200, do not cache the web page instead forward the HTTP response to the client

13. When the client requests a webpage that is in the list.txt file (cached) the stored page is returned

14. Test web caching by accessing multiple websites. Most websites are not http websites so only select http websites. Some http websites are given here (Links to an external site.)

15. A sample list.txt is shown below.

www.google.com 20210210090000

www.example.com 20210210090200

www.weevil.info 20210210090300

Deliverables:

1. Commented server and client C code

2. A Makefile to compile (make) the source code and to clean (make clean) the binaries

3. A readme file that describes how to compile, execute, and test the code.

4. Create an assignment folder with folder name as euid_PA2 (example: xyz0202_PA2) and add all the source files, Makefile, and the readme file to the folder.

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