Mapping SCSI driver to USB one.

[arrowdodger]

Hello.
I'm playing around with sysutils/hal sources and can't find a way to obtain
a SCSI driver to the corresponding USB device. In other words, knowing
"umass0" i want to get "da0" for it.
>From what i can tell, HAL uses CAM API's (/dev/xpt0 stuff), but working
with it requires elevated privileges. Probably, because of that hald-runner
is running under root.
Is there any way to perform such mapping as regular user?