Date: Thu, 20 Feb 2003 19:00:54 +0100 From: Pawel Jakub Dawidek <nick@garage.freebsd.pl> To: Robert Watson <rwatson@freebsd.org> Cc: freebsd-hackers@freebsd.org, phk@freebsd.org Subject: Re: Multi-level jailing. Message-ID: <20030220180054.GD76998@garage.freebsd.pl> In-Reply-To: <Pine.NEB.3.96L.1030220100414.76380A-100000@fledge.watson.org> References: <20030217070554.GE10767@garage.freebsd.pl> <Pine.NEB.3.96L.1030220100414.76380A-100000@fledge.watson.org>
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On Thu, Feb 20, 2003 at 10:05:52AM -0500, Robert Watson wrote:
+> > I have prepared patch for jail functionality against FreeBSD
+> > 5.0-CURRENT. It provides multi-level jailing and multiple ips for
+> > jails.
+>
+> Sounds cool, although I haven't had a chance to read the patch yet.
+> Question: how did you handle the problem (if at all) that INADDR_ANY
+> doesn't perform a wildcard binding with multiple IPs in the same jail?
+> It's not strictly required that it be handled, but it was always one of
+> the semantic problems I bumped into when I experimented with more IPs. A
+> single-IP jail "works" because it maps INADDR_ANY into the only IP
+> available. I'll try to get a box up and running with these changes in the
+> next few days and give them a spin.
Hmm, this problem is still there, but I think that we could resolve it
by changing all code where IP is compared to INADDR_ANY, to function
like this:
int
prison_inaddr_any(struct ucred *cred, u_int32_t ip)
{
register u_int i;
register struct prison *pr = cred->cr_prison;
if (!jailed(cred))
return (ip == INADDR_ANY);
for (i = 0; i < pr->pr_nips; ++i) {
if (pr->pr_ips[i] == ip)
return (1);
}
return (0);
}
And remove mapping to specified IP, INADDR_ANY should stay there.
--
Pawel Jakub Dawidek
UNIX Systems Administrator
http://garage.freebsd.pl
Am I Evil? Yes, I Am.
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