Re: 64-bit fun with cache.c

On Thu, Jan 22, 2009 at 08:20:35PM -0600, Mark Johnson wrote:
> Has anybody successfully hacked cache.c for 64-bit operation?  I'm
> screwing around with this now:

This modification won't work as is for caches larger than 4GB.  The
offsets stored in the hash table are 4 bytes, and so will break where
they cross a 4GB boundary.  Those links (see line 207) will need to be
increased to 8 bytes as well.

Technically, the key and data sizes should be increased to 8 bytes as
well, but I don't think this is relevant to DNS.  In fact, they could
probably be reduced to 2 bytes, as each response section in DNS is
limited to 64kB.  However, I'm not clear what exactly dnscache stores in
the cache, and if there could be records larger than 64kB for gargantuan
DNS responses.

-- 
Bruce Guenter <[email protected]>                http://untroubled.org/

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