Network Programming
Spring 2001

• Style was worth 25 points. Any of the following violations of good style were penalized 5 points.
  • Poor Commenting: Your comments should be clear and consise making the program easy to follow and read.
  • Unfreed Mallocs: These result in memory leaks. Any time you malloc memory, you must have a corresponding free for that memory.
  • Messy pointer arithmatic. Its not clear what you are doing with your pointer manipulation.
  • Indentation/Readability - Loops should be indented, whitespace should be used effectively to make your program human readable.
  • Not Following directions - If you didn't send a readme file or didn't name your files l2.c, l3.c, l4.c you were penalized.

• Functionality was worth 75 points. Basic Functionality (works for a normal case) was worth 50. The remaining 25 points came from 5 tests woth 5 points.
  • Basic test - I used the user/pass combination of "should work" and my layer 1 with my main.
  • Buggy layer 1 - I used my buggy layer 1 with my main. This test should produce an error (and not a crash)
  • Null test - This tests if a string of nulls can be sent without crashing (or producing garbage output. I used My null injecting layer 4 with my main
  • No Null test - This test tests if a non-null terminated string can be transmitted correctly. I used my layer 4 with my main

    This nonull test will fail if you assume that the string is null terminated in layer 2. People have used a sprintf or strcpy to copy their string into another string. Since my layer 4 has a null character between the end of the text string and the checksum, the checksum would not be copied correctly.

  • Big layer 3 test - This tests if you reject strings of >999 characters. I used my layer 3 with my main This test should fail but not crash.