Docsity
Log inSign up
Docsity
Prepare for your exams
Prepare for your exams

Study with the several resources on Docsity

Earn points to download
Earn points to download

Earn points by helping other students or get them with a premium plan

Guidelines and tips
Guidelines and tips
Sell on Docsity
Sell on Docsity
Log inSign up

Prepare for your exams

Study with the several resources on Docsity

Find documents

Prepare for your exams with the study notes shared by other students like you on Docsity

Search Store documents

The best documents sold by students who completed their studies

Search through all study resources
Docsity AINEW

Summarize your documents, ask them questions, convert them into quizzes and concept maps

Explore questions

Clear up your doubts by reading the answers to questions asked by your fellow students

Earn points to download

Earn points by helping other students or get them with a premium plan

Share documents
download point icon20 Points

For each uploaded document

Answer questions
download point icon5 Points

For each given answer (max 1 per day)

All the ways to get free points
Get points immediately

Choose a premium plan with all the points you need

Study Opportunities

Choose your next study program

Get in touch with the best universities in the world. Search through thousands of universities and official partners

Community

Ask the community

Ask the community for help and clear up your study doubts

University Rankings

Discover the best universities in your country according to Docsity users

Free resources

Our save-the-student-ebooks!

Download our free guides on studying techniques, anxiety management strategies, and thesis advice from Docsity tutors

From our blog

Exams and Study
Go to the blog

CS332 TCP Chat Server Assignment: Implementing a Chat Server, Slides of Printing

Scotland's Rural University College (SRUC)Printing

An assignment for a tcp chat server in cs332 course. Students are required to write the server code based on the given outline, handle command-line arguments, and implement error handling. The server should recognize special messages from clients and respond accordingly. The document also includes implementation notes and grading rubric.

What you will learn

  • What should students do when a socket is ready to read from an already connected client?
  • How should students implement the main socket in the chat server?
  • How should students handle errors in the chat server?

Typology: Slides

2021/2022

Uploaded on 09/27/2022

melanycox
melanycox 🇬🇧

5

(8)

227 documents

1 / 3

Toggle sidebar

This page cannot be seen from the preview

Don't miss anything!

bg1
CS332:&TCP&Chat&Server&
!
For!this!assignment,!you!need!to!write!the!chat!server!for!which!you!wrote!a!client!
last!week.!!
!
The!basic!outline!of!the!server!code!is!this:!
• Your!code!reads!options!from!the!command!line!(see!below).!
• Your!code!opens!a!socket,!makes!it!REUSEADDR (look!it!up!),!binds!it!to!a!
port!(default!12345),!and!begins!listening!on!it.!
• Add!this!main!socket!to!a!list!of!sockets!from!which!to!read.!!I’ll!refer!to!that!
variable!as!socks.!
• In!a!forever!loop:!
o Do!a!select() on!socks!
o If!the!socket!that!is!ready!to!read!from!is!the!main!one,!accept!the!new!
connection,!and!send!the!string!“Thank!you!for!connecting”!on!the!
socket.!!Add!the!new!client!socket!to!your!socks!list.!
o Else!(the!socket!is!an!already!connected!client!socket):!
§ Call!recv(1024)!on!the!socket!(to!read!up!to!1024!bytes),!
reading!in!the!message!from!the!socket.!
§ If!the!result!is!bad,!remove!that!socket!from!socks.!
§ Else:!
• Send!the!message!you!read!from!the!socket!on!all!the!
other!client!sockets.!
!
You!may!implement!this!in!any!language!you!want,!but!the!outline!I’ve!given!you!
above!is!based!on!my!python!implementation.!
!
You!must!implement!these!command-line!arguments:!
!
Name(s)!
Option!
Meaning!
Default!value!(if!
option!not!given)!
-v,!--verbose!
!
Turn!on!verbose!
printing!to!help!
debugging!
False!
-p,!--port!
Port!number!
The!TCP!port!the!
server!is!listening!
on.!
12345!
!
!
When!verbose!is!turned!on,!your!client!should!print!out!enough!information!to!help!
you!figure!out!what!your!program!is!doing.!E.g.,!my!client!prints!out!a!message!
whenever!it!gets!a!new!connection!from!a!client,!whenever!that!client!connection!
goes!away,!whenever!it!resends!a!message!to!all!clients,!etc.!
pf3

Partial preview of the text

Download CS332 TCP Chat Server Assignment: Implementing a Chat Server and more Slides Printing in PDF only on Docsity!

CS332: TCP Chat Server

For this assignment, you need to write the chat server for which you wrote a client last week. The basic outline of the server code is this:

  • Your code reads options from the command line (see below).
  • Your code opens a socket, makes it REUSEADDR (look it up!), binds it to a port (default 12345), and begins listening on it.
  • Add this main socket to a list of sockets from which to read. I’ll refer to that variable as socks.
  • In a forever loop: o Do a select() on socks o If the socket that is ready to read from is the main one, accept the new connection, and send the string “Thank you for connecting” on the socket. Add the new client socket to your socks list. o Else (the socket is an already connected client socket): § Call recv(1024) on the socket (to read up to 1024 bytes), reading in the message from the socket. § If the result is bad, remove that socket from socks. § Else: - Send the message you read from the socket on all the other client sockets. You may implement this in any language you want, but the outline I’ve given you above is based on my python implementation. You must implement these command-line arguments: Name(s) Option Meaning Default value (if option not given)
  • v, --verbose Turn on verbose printing to help debugging False
  • p, --port Port number The TCP port the server is listening on.

When verbose is turned on, your client should print out enough information to help you figure out what your program is doing. E.g., my client prints out a message whenever it gets a new connection from a client, whenever that client connection goes away, whenever it resends a message to all clients, etc.

Implementation Notes Your code should handle errors gracefully. I.e., if a system call returns an error, you should print out a useful message and exit gracefully. The user should not see a core dump or a stack trace printed out. You must handle the case where the server goes down when your client is still connected. You will find the first lines of the talk_server.py file in /home/cs/332/sp2016/chat/ folder. You exit your talk_server by doing Ctrl-C in the terminal window in which it is running. There are a ton of implementations of this online. For your own learning experience, do not copy and paste code from them. If you have to look up how to use select(), e.g., you’ll probably see an implementation of the client or server… Try to implement as much as you can without copying code from online. You must cite every place where you find code that you copy into your code. Those Doing the Class for Honors The server must recognize and respond to the following special message that clients can send:

  • /who: return a string of info about who all is connected. The string looks like this: clients connected. connected from , . … … To do this, you’ll have to keep track of info about the names the clients chose for themselves, and where the clients are connected from. I do this in a dictionary that maps the socket to a (name, IPaddress, port) tuple. The IP address and port you get from the result of the accept() call. Initially, the name will be unknown, so I just use the string “”. The name you will have to get from a message sent by the client. Recall that each client prepends the following to the beginning of each message: says: . When you receive a message from a client, parse that message, extracting the and update your dictionary with the name.