CS779/879

Assignment #1

Due Midnight, Wednesday   February 18, 2009

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Write the following program in C:

NAME

McastSendRecv - Multicast Sending & Receiving

SYNOPSIS

McastSendRecv <multicast-address> <port-number>

DESCRIPTION

The program creates two sockets:

Ø Multicast socket: M

The socket joins the multicast group G defined by the two arguments:

<multicast-address> <port-number>

Ø Unicast socket: U

The socket is used to send messages to G.

U is used to send two types of messages:

Ø Heartbeat Messages: sent periodically (e.g., every 5 seconds) to G indicating it is alive.

Ø Chat Messages: typed be the user at the keyboard and sent to G.

M receives two types of messages:

Ø Heartbeat Messages: is used to update the members list L.

Each member in L has a unique identity I given by the U socket’s unique pair:

<IP address, Port number>

Ø Chat Messages: is displayed to the TTY preceded by the sender’s identity I.

When the user types:

Ø CTRL-C the program displays the members list L.

Ø CTRL-D the program Exits.

The following figure is an illustration of the program description.

Implementation details:

The program utilizes the multicast examples and uses the UNIX signals.

For introduction to UNIX signal handling, see Signals

You may test the Example implementation at:

http://www.cs.odu.edu/~cs779/spring09/assignments/a1/wahab/

Testing the example:

% McastSendRecv 224.0.0.0 10101