Re: Summary: what to do about INET/CIDR

* Alex Pilosov <alex(at)pilosoft(dot)com> [001103 20:47]:
> Agreed with all of it, but how about incorporating conversion from inet
> to int8? (first octet*256*256*256+second octet*256*256+third
> octet*256+fourth octet).
>
> This will allow to do a lot of magic with addresses using plain math.
>
> Also, I'd still like netmask_length, length of netmask in bits.
masklen(inet) is there:
int4 | masklen | inet

from a \df.

Can we also get it to work on cidr (or allow cast from inet to cidr).

>
> -alex
>
> On Fri, 3 Nov 2000, Tom Lane wrote:
>
> > 5. The function broadcast(inet) will now return inet not text. It
> > will take the given address octets and force the bits to the right
> > of the netmask to 1. The display type will be set to inet. I am
> > inclined to have it return the same masklength as the input, so for
> > example broadcast('127.1/16') would yield '127.1.255.255/16'::inet.
> > If you want the broadcast address displayed without a netmask
> > notation, you'd need to write host(broadcast(foo)). Alternatively,
> > we could say that broadcast() always returns masklen 32, but I think
> > this loses valuable functionality.
> >
> > 6. The function network(inet) will now return cidr not text. The result
> > has the same masklen as the input, with bits to the right of the mask
> > zeroed to ensure it is a valid cidr value. The display type will be
> > set to cidr. For example, network('127.1.2.3/16') will yield
> > '127.1/16'::cidr. To get this result displayed in a different
> > format, write host(network(foo)) or text(network(foo)).
> >
> > 7. The function netmask(inet) will now return inet not text. It will
> > return octets with 1s in the input's netmask, 0s to the right, and
> > output display type and masklen set to inet and 32. For example,
> > netmask('127.1/16') = '255.255.0.0/32'::inet which will display as
> > '255.255.0.0'. (I suppose a really anal definition would keep the
> > input masklen, forcing you to write host(netmask(foo)) to get a
> > display without "/n". But I don't see any value in that for
> > netmasks.)
> >
> > 8. Because we still consider inet and cidr to be binary-equivalent types,
> > all of these functions can be applied to either inet or cidr columns.
> >
> > Comments?
> >
> > regards, tom lane
> >
> >

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Larry Rosenman http://www.lerctr.org/~ler
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