COMPUTER NETWORKS
CONE Lab
Exercise with sockets
Write a client-server application which uses a socket as communication means:
- Server
features
- Waits on a well-known port that can be defined through the command line
- Handles the authorization phase with the client (user+password)
- Accepts the commands list command from the client and returns the list of commands the client can execute through the server
- Accepts
the execute
commmand
<parameters> command
- Verifies whether command belongs to the list of the allowed commands and, in this case, executes locally the command and returns the result to the client
- In the negative case, returns an error message
- Goes back waiting for a new command from the client
- Understands the quit command and closes the connection
- Client
features
- Connects to a server specifying name and port through the command line
- Handles the authorization phase with the server (user+password)
- Allows to send the the commands list command to the server and shows the list of commands the client can execute through the server
- Allows
to send the execute
commmand
<parameters> command
to the
server
- Shows the result of the remote execution to the user
- Allows the user to execute a new command
- Handles the he quit command that closes the connection
Examples of client and a server (written in C for a Linux environment) communicating through sockets