Getting domU vif's MAC address from dom0

[Andy Smith <andy@xxxxxxxxxxxxxx>]

Hi,

Is there an easy way of programmatically obtaining the domU-side MAC of
a vif, from the dom0?

Example:

A domU called debtest1 with a vif named v-debtest1, in dom0:

$ ip --brief link show dev v-debtest1
v-debtest1       UP             fe:ff:ff:ff:ff:ff 
<BROADCAST,MULTICAST,UP,LOWER_UP>

in domU:

$ ip --brief link show dev enX0
enX0             UP             00:16:5e:00:02:39 
<BROADCAST,MULTICAST,UP,LOWER_UP>

Easiest way to get 00:16:5e:00:02:39 in dom0?

I know I can get it from xenstore if I know the domain ID:

$ sudo xenstore-read /local/domain/0/backend/vif/60/0/mac
00:16:5e:00:02:39

So, I can resolve domU name to domain ID and do that I guess.

I want this from a vif script. Is the domU domain ID exposed to the vif
scripts at all (e.g. vif-route)?

I can also parse it out of the domU's config file, but that seems quite
hacky.

The purpose of this is in order to add a route via the IPv6 link-local
address inside the domU, which can be calculated from the MAC address
of the domU's interface.

Thanks,
Andy