[dns-operations] forward compression pointers?

Ray.Bellis at nominet.org.uk Ray.Bellis at nominet.org.uk
Wed Sep 2 10:37:43 UTC 2009

> >   Examples of malformed packets that MAY be dropped include:
> >
> >   o  invalid compression pointers (i.e., those that point outside of
> >      the current packet or that might cause a parsing loop)
> I can't construe from that sentence alone that forward pointers may be 
> dropped, for instance, a pointer to the exact location of that pointer 
> is not a forward pointer, but can still cause loops.

Indeed, but as Mark points out this _example_ in 5625 was based on the 
text from 1035 which says that a compression pointer may only point to a 
_prior_ occurrence of the same name.

That clearly (IMHO) prohibits a pointer that points to itself.


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