Assignment 3
                    CS494-unp
                   revised: 9/7/99

Assigned: 9/2/99
Due: 6:00pm 9/15/99 

Objective:  TCP client and DNS

Points: 30

Description:

  Construct a TCP echo client that takes as arguments a host name or IP
  address and optionally a port number (default 7), and optionally
  a message length (default 1024, max 2048), and optionally the number of
  repetitions (default 100).  (Consider getopt() for argument processing,
  or positional arguments will do.) Your inline documentation should
  describe how arguments are to be supplied.

  Your client should connect to the given host on the given port,
  record the start time (use seconds() described in class).
  Then for the specified number of repetitions, send (writen())
  and receive (readn()) an arbitrary message of the specified length.
  Record the ending time.  Your program should then print
  the hostname, repetitions, message length, elapsed time, and kilobits/second.

  Provide the output from your program when testing with the following
  hosts using 100 repetitions and message sizes (bytes) of 8, 256, 1024, 2000.

  host: cetus2b (or any of the cetus* critters)   port:7
  host: 128.169.93.200     port:8989
  host: www.hawaii.edu   port: 7   

  Check error status on ALL network function calls.

  Do NOT use any of the Stevens' libraries nor his wrapper include file.

  Optional: please indicate amount of time required to complete assignment.

  Use ~dunigan/cs494-unp/494submit to submit your source files and output.
  See http://www.cs.utk.edu/~dunigan/cs494-unp/policy.txt