This would be a rather cool feature to have. I know this sort of thing
definitely works on gauntlet firewalls as I've used it to do some rather
strange things. The gauntlet has a slightly modified BSD/OS network stack
though ... I can't say I remember ever getting it to work on anything
other than a gauntlet.
Strictly speaking there is a clash between INADDR_ANY and a bind to a
specific address as INADDR_ANY already includes that address but
practically it's nice to have bind perform much like a routing table where
the most specific entry is chosen and you can have an 'overlap'.
If anyone knows how to get this sort of thing going on linux I'd be very
interested although I'm almost sure I asked this once before a long time
ago and I seem to recall being told it was a non-trivial exercise based on
how the linux stack currently worked.
If any bright people would like to take a look at it, net/ipv4/tcp_ipv4.c
contains a tcp_v4_verify_bind function ... of course said people would
know where to look ;)
Thank you,
--Craig
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