• Part 1 [50 points total]: Modify one of the echo client applications given in class. The new echo client you create should read lines from a given file and send each line to the echo server and then receive the echo back from the server in a loop until end of file is reached. The application should print out how many bytes were received from the server after every send and receive operation. The application should take the IP address and port to connect to from the command line as well as the filename. The application should disconnect from the server and exit gracefully upon receiving an end of file from standard input. It should be able to understand both hostnames and IP addresses in dotted decimal notation.
• Part 2 [50 points total]: Modify one of the echo server applications given in class. The new echo server should have a few additions:
  • A [10 points]: This new echo server should conform to the RFC document for the echo protocol given in class. This includes modifying the server to process each connection until the client disconnects. In other words, the server should loop around the recv/send part until the recv returns a value of 0 bytes received.
  • B [5 points]: It should have the ability to take the port number to bind to from the command line.
  • C [15 points]: It should handle multiple connections concurrently. For C/C++, this means adding usage of fork() and reaping all child processes or using POSIX threads. For Java, the use of the Thread class will be necessary. Follow a process per connection or thread per connection model as appropriate.
  • D [20 points]: It should, optionally as a command line argument, have the ability to change the data before sending back the echo of the data. This change is to remove all whitespace (spaces, returns, newlines, etc.) in the text and send back the changed text.

Notes: Your submissions must at least compile before any credit will be given. Submissions that do not compile will not be graded. Submissions submitted after the due date will not be graded. All work must be your own original work. To get partial credit for parts of the assignment, you must demonstrate that those pieces work by themselves. If you share code with others, you will be given a 0 for the assignment. This assignment set is worth 16% of your total grade.