[libvirt] [PATCH v3 11/14] Core driver implementation with ebtables support
Daniel P. Berrange
berrange at redhat.com
Thu Mar 25 16:40:15 UTC 2010
On Thu, Mar 25, 2010 at 12:26:34PM -0400, Stefan Berger wrote:
> libvir-list-bounces at redhat.com wrote on 03/25/2010 11:59:11 AM:
>
>
> > "Daniel P. Berrange" <berrange at redhat.com> wrote on 03/25/2010 11:49:05
> AM:
> >
> > > Please respond to "Daniel P. Berrange"
> > >
> > > On Tue, Mar 23, 2010 at 10:54:17AM -0400, stefanb at us.ibm.com wrote:
> > > > +/*
> > > > + char macaddr[VIR_MAC_STRING_BUFLEN],
> > > > + ipaddr[INET_ADDRSTRLEN],
> > > > + number[20];
> > > > + char chain[MAX_CHAINNAME_LENGTH];
> > > > + virBuffer buf = VIR_BUFFER_INITIALIZER;
> > > > +
> > > > + if (nwfilter->chainsuffix == VIR_NWFILTER_CHAINSUFFIX_ROOT)
> > > > + PRINT_ROOT_CHAIN(chain, chainPrefix, ifname);
> > > > + else
> > > > + PRINT_CHAIN(chain, chainPrefix, ifname,
> > > > + virNWFilterChainSuffixTypeToString
> > > (nwfilter->chainsuffix));
> > >
> > > Since we're passing this into the shell, I think we should do paranoid
> > > validation on the 'chain' and 'ifname' fields, since they ultimately
> come
> > > from the user specified XML. Validate that it only contains a-Z, 0-0,
> -, _
> >
> > Actually the user specified XML only currently allows the chain names
> 'arp',
> > 'ipv4', 'ipv6' and 'root'. Others will already be rejected when
> > parsing the filter.
> >
>
> Actually, yes, there's a problem with target device names like t\"t that
> do create an
> interface named t\"t but end up creating an ebtables entry with interface
> t"t. So
> if I don't go through bash it works correctly, otherwise it does not and I
> guess I
> would need to escape the '\' with '\\\'.
Such interface names are insane & we should just refuse them, rather than
trying todo escaping :-)
Daniel
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