UDP Client/Server Application

How to run a server

./server -a [HOST] -p [PORT]

• -h : show usage
• -v : show version
• -d : run as daemon
• -w : emulate work and sleep N seconds (example: -w 10)
• -l : specify logfile, default /tmp/lab2.log (example: -l LOGFILE)

Some options may be passed through environment variables:

• L2ADDR
• L2PORT
• L2WAIT
• L2LOGFILE

Example: L2ADDR="127.0.0.1" L2PORT="8080" L2WAIT=10 ./server -d

How to use a client

./client -a [HOST] -p [PORT] -m "MESSAGE"

Server returns a "MESSAGE" in Base64 encoding.

How to use signals

1. find out the pid_of_server with the following command: lsof -i :[PORT]
2. use the following command to send a signal: kill -SIGNAL pid_of_server