Re: INET/CIDR types

From: Alex Pilosov <alex(at)pilosoft(dot)com>
To: Larry Rosenman <ler(at)lerctr(dot)org>
Cc: Sevo Stille <sevo(at)ip23(dot)net>, pgsql-hackers(at)hub(dot)org
Subject: Re: INET/CIDR types
Date: 2000-07-25 03:25:41
Message-ID: Pine.BSO.4.10.10007242314200.4362-100000@spider.pilosoft.com
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Yes, I know.
I didn't say it existed, I proposed to create a simple conversion function
that would do that, which is why I asked for a patch.

I'd do it myself but it'll take some time. Should be really simple,
something to the effect of return a.s_addr (where a is struct in_addr),
however, I'm not sure what's POSIXly correct way to do that.

On Mon, 24 Jul 2000, Larry Rosenman wrote:

> The bad news is it doesn't work now...
>
>
> ler=# select host(netblock::int8::inet) from networks;
> ERROR: Cannot cast type 'cidr' to 'int8'
> ler=# \d networks
> Table "networks"
> Attribute | Type | Modifier
> ---------------+--------------+----------
> netblock | cidr |
> router | integer |
> interface | varchar(64) |
> dest_ip | inet |
> net_name | varchar(64) |
> owner | integer |
> origin | varchar(256) |
> assigned_date | date |
> assigned_by | varchar(64) |
> asn | smallint |
>
> ler=#
>
> > On Mon, 24 Jul 2000, Larry Rosenman wrote:
> >
> > > > This whole discussion is quite silly guys.
> > > >
> > > > It is quite reasonable to have ability to split CIDR net into two pieces:
> > > > the network and the bitshift. Second one is already possible, the first
> > > > one can be accomplished by having functions to convert a cidr/inet to int8
> > > > (not int4 because of sign thing), and back.
> > > >
> > > > Its also very easy to implement ;)
> > > >
> > > > This will actually come very useful for many applications. Something I'm
> > > > working on now (allocation of 'most appropriate' block) requires ability
> > > > to split a netblock into two, which could be most easily accomplished
> > > > using int8 math. (net::int8+2^(netmask(net)-1)).
> > > All I'm looking for is to be able to print all 4 octets of an IP address
> > > out so that joe user can take the 4 numbers and type it into the
> > > 4 boxes on a Windows 98 box, and use them.
> > >
> > > Is that really that abhorrent?
> > >
> > > They also need the 4 octet netmask which I can get now.
> > >
> > > All we are missing is a way to print ALL 4 NUMBERS ALL THE TIME
> > > for the output. It's not asking for classful, and for sure
> > > we use CIDR all over the place, but for the final output that my
> > > users see, why can't I have the database just print all 4 octets?
> >
> > Larry,
> > With my suggestion, you can do it as follows:
> >
> > net::int8::inet
> >
> > (net being of cidr type)
> > -alex
> >
>
>
>

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