[TimT]

Where is the crack in relation to the height of the drain?

What is the diameter of the drain?

Is it PVC for sure? or ABS?

You may get lucky, go to a local Home Depot or Lowes etc. and see if the have any buckets that can nest snuggly within the drain, cut off the bottom, cut of the top, get some PVC glue and sleeve the drain..

Or if a piece of PVC pipe OD closely matches the ID of the drain.... same idea sleeve it...fill the annular space with caulk ...