Getting Started

Download CS365_Lab13.zip and unzip it.

You will edit the code in arithmetic_server.c.

Your Task

Write a server that

listens on a TCP port and accepts connections
reads a single line of text from each connection
parses the received text to extract two integer values
computes the sum of the integer values
sends a single line of text containing the sum back to the client
closes the connection socket

You can use the socket example programs from Lecture 15 as a reference.

Hints

Use dup to duplicate the client socket file descriptor
Use fdopen to convert the client socket into two FILE* file handles, one for reading, one for writing
Use fscanf to read two integer values from the client file handle (reading from the read file handle)
Use fprintf to send the result value back to the client (writing to the write file handle)

You can implement this server as a “one shot” protocol” where the server reads a single request, sends back a single response, and then closes the connection.

If you have additional time, you can consider adding the following features:

Allow the client to submit multiple requests, one per line, and have the server send back as many responses as necessary
Use threads to allow multiple clients to connect simultaneously

Testing

You can use the telnet program to test the server. For example, if the server is listening on port 10001, then run the command

telnet localhost 10001

to connect to the server. You can type a line of text containing the two numbers to be added. You should see a response containing their sum.