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falcosecurity
New transformer: `len()`
Motivation
While discussing the intersect operator with @jasondellaluce, we realized there's no easy way to check for an empty list or, more generally, to know a list length.
It would be beneficial when one needs to create an exception, for example:
len(class.somelist) > 0 and not class.somelist intersect (allowlist)
(n.b. not class.somelist intersect (allowlist) is true when class.somelist is an empty list)
Furthermore, there may be compelling use cases where knowing the length of a list or a string is useful.
Feature
Develop a len() transformer that accepts a sizable type (e.g., LIST, CHARBUF, BYTEBUF) as input and returns its length as an integer.
Alternatives
No actual alternatives have been considered yet.
Additional context
This is a very rough proposal, which may need some discussion. Feedback is welcome.
