SUBJECT

You are required to implement a Multi$-$User MESSAGING application without any graphical user interface$($GUI$)$ using $C$

language. The project should include $2$ different programs which run independently on server$-$side and client$-$side. The

server$-$side program would listen to the clients and capture messages and then deliver them to the corresponding client

$($user$).$ The client$-$side programs would react like users and these programs could be run on different terminals

simultaneously. The details of the system are given below. Please read them carefully and strictly conform to these details

while implementing the system.

System Details

The server$-$side program would have the following capabilities:

It would

listen to the clients continuously.

deliver the messages to the corresponding user

store all the user list of each client

deliver the alert messages to the corresponding user

The client$-$side program would have the following capabilities:

User would

display their contact list

add$/$delete a user to$/$from contact list

check message$($s$)$

write a message and send it to one of the users within the contact list

receive a message and read it

display the message history of each user within his$/$her contact list

$($should be ordered by date ascending$)$

delete corresponding message$($s$)$

see alert messages including "Message Received", "Message Sent", $2.$ TIPS AND HINTS

This project should be partitioned into several modules and each module should be implemented separately. You should also clearly define inputs and outputs of each module.

$$ There would be two separate programs. server.c and client.c $$ Both programs should run on localhost but separately.

$$ Only one server.exe would run at the same time whereas many clients.exe would run on different terminals simultaneously.

$$ Each client should login to the system by sending his$/$her unique userid. $.\backslash$client userid

$$ The server$-$side program should compare the userid to the userlist saved on the server$-$side. If the user does not exist

within the list, the server should add the user to the list and create a contact list for that user.

$$ Each client should send a request to the server by selecting $$CHECK MESSAGES$$ item in the menu in order to get new message$($s$).$

$$ There will be $3$ different types of messages.

o Request for Login

o Request for Sending a Message o Request for Receiving a Message

$$ The following information of the users should also be stored at server side: UserID$($unique$),$ Mobile Phone Number, Name, Surname