>>> Unless I'm unaware of some sockets magic TCP Wrappers (or any other
>>> user-level application) can never do this....
>> You're unaware.  See [gs]etsockopt(,IPPROTO_IP,IP_OPTIONS,,).
> I wish I could. I find no mention of any of that in getsockopt(2),
> nor in any of referenced manual pages either.

I didn't say "see the manpages for...".  Use The Source, Luke.

It may be under-documented, but it's there.

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