Network Programming with Perl

A Time of Day Client

We'll start our discussion with udp_daytime_cli.pl, a UDP-based network client for the daytime service. As you might recall from Chapters 1 and 3, the TCP-based daytime service waits for an incoming connection and responds with a single CRLF-delimited line that contains the time and date at the server's machine. The UDP version of the daytime service is similar, but behaves slightly differently because it's a datagram-based service. Instead of waiting for incoming connections, the UDP service waits for incoming datagrams. When it receives a datagram, it examines the sender's address and then transmits to this address a return datagram that contains the current time and date. No connection is involved.

Our client takes up ...