CS779/879

Assignment #2

Write the following program in C/C++ or any other language:

NAME

DAGMC - Destination Address Group Multicast Chat

SYNOPSIS

DAGMC <multicast-address> <port-number>

DESCRIPTION

· The program creates a single UDP socket U:

The socket joins the multicast groups G1 & G2 derived by the two arguments:

<multicast-address> <port-number>

e.g., 224.0.0.1 10123

G1 (224.0.0.1, 10123) &

G2 (224.0.0.2, 10123)

· The socket U is used to send/receive two types of multicast messages:

1. Heartbeat Messages: sent periodically (e.g., every 5 seconds) to G2, indicating it is alive.

2. Chat Messages: typed be the user at the keyboard and sent to G1.

· When the socket receives these two types of messages it reacts as follows:

1. Heartbeat Messages: are used to update a group membership list L.

Each member in L has a unique identity I given by the unique pair:

<Host Name> <Sender Process ID>

e.g., vega.cs.odu.edu 7893

Whenever a new member is added/deleted, the program displays the information I

of the added/deleted member and then displays the updated list L.

2. Chat Messages: are displayed to the TTY preceded by the sender’s identity I.

· When the user types:

§ CTRL-C the program displays the list L.

§ CTRL-D the program Exits.

· If it receives a unicast message it replies to the sender by sending the list L.

· The following figure is an illustration of the program description:

· You may test the Example implementation at:

http://www.cs.odu.edu/~cs779/spring11/assignments/a2/wahab/
Enter the following command on some of the fast machines,

e.g., vega, antares, capella and procyon.

% DAGMC 224.0.0.1 10123