Hi,
I've been exploring core.logic while working through The Reasoned Schemer
and would like to be able to describe relationships between IP addresses
and networks that they may or may not be a part of. It's straightforward to
do this in Clojure because I can use bit-and on a network and a mask and on
an IP and a mask. If the results are the same, then the IP is in the
network. At least, that is how I understand it. Here's a predicate function
that does this:
> (defn in-network?
[address network netmask]
(= (map bit-and network netmask)
(map bit-and address netmask)))
> ;; 192.168.1.3 is in 192.168.1.0/24
(in-network?
[192 168 1 3]
[192 168 1 0]
[255 255 255 0]) ;; true
;; but 192.168.100.3 isn't
(in-network?
[192 168 100 3]
[192 168 1 0]
[255 255 255 0]) ;; false
It would be cool to be able to do this with core.logic so I could have a
relationship like in-networko that could describe IPs and networks. I'm
running into issues implementing this because lvars aren't supported by the
bitwise operators from Clojure and I can't seem to find anything in
core.logic that does what I need out of the box. The Reasoned Schemer
describes a bunch of bitwise operations, but implementing them seems like
it will involve a lot of work to turn the integers from an IP into lists of
bits and back again. Is there a better way to do this? Any insight would be
appreciated.
Thanks in advance,
Dave
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