Date: Mon, 12 Feb 2007 12:41:02 -0600 From: Brooks Davis <brooks@FreeBSD.ORG> To: freebsd-stable@FreeBSD.ORG Subject: Re: Desired behaviour of "ifconfig -alias" Message-ID: <20070212184102.GD52751@lor.one-eyed-alien.net> In-Reply-To: <200702121823.l1CINXHt066223@lurza.secnetix.de> References: <20070212175940.GA52751@lor.one-eyed-alien.net> <200702121823.l1CINXHt066223@lurza.secnetix.de>
next in thread | previous in thread | raw e-mail | index | archive | help
--ZJcv+A0YCCLh2VIg
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
Content-Transfer-Encoding: quoted-printable
On Mon, Feb 12, 2007 at 07:23:33PM +0100, Oliver Fromme wrote:
> Brooks Davis wrote:
> > Oliver Fromme wrote:
> > > Brooks Davis wrote:
> > > > ipv4_addrs_<interface> is a much better replacement IMO. It's eas=
y to
> > > > use and doesn't required the hackish pseudo array traversal used by
> > > > ifconfig_iface_aliasX.
> > >=20
> > > That might work for simple cases, but how do you specify
> > > other parameters beside the IPs if you need to?
> >=20
> > What do you need to set? It's sets IP and netmask. It doesn't handle
> > broadcast, but I'd be pretty suprised if that's needed often.
>=20
> True, not often, but sometimes. I had cases like that in
> certain environments with bridged networks and arp proxies.
>=20
> I'm fine with your proposed syntax, as long as all the
> existing ifconfig possibilities continue to be possible,
> i.e. no regression.
FWIW, it's HEAD and 6.1. We've actually got the aliases syntax labled
as deprecated in the manpage. We might want to add a feature to set the
broadcast address.
> > is needed? Axing ifconfig_iface_aliasX is not needed, but reducing the
> > visiability of the interface in the documentation is probably in order
> > particularly since it's quite fragile since you have to renumber whene=
ver
> > you remove an entry.
>=20
> Yup, I agree, that's a PITA. That could be solved in the
> shell code, though, by not enumerating until a number
> doesn't exist, but instead looking at the set of all
> shell variables that have been set, similar to this:
>=20
> set | grep "^ifconfig_${IFACE}_alias" | cut -f1 -d=3D | ...
Unfortuanly grep in in /usr/bin so can't be used. You could do it
with sh variable mangling and case though. Something like:
{ while read _var; do
_var=3D${_var%%=3D*}
case $_var in
ifconfig_${IFACE}_alias*)
<...>
;;
esac
done } < `set`
-- Brooks
--ZJcv+A0YCCLh2VIg
Content-Type: application/pgp-signature
Content-Disposition: inline
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.6 (FreeBSD)
iD8DBQFF0LS9XY6L6fI4GtQRAmTMAJ4i6Kn/2sSX5UaFvL/l8mElJqiuJgCgo7hT
6pL0dAqXf9N+WoIupWMkyG0=
=x8h1
-----END PGP SIGNATURE-----
--ZJcv+A0YCCLh2VIg--
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20070212184102.GD52751>