utils: T9322: reject addresses that are not a single address and honour zone indexes

The helper that tells whether an address is assigned to an interface
accepted ranges and addresses with a zone index. A range ended in a
traceback. A zone index was ignored, so an address on the loopback
interface was reported as assigned to the interface named in the zone.

The helper now rejects everything that is not a single address, a zone
index included. The functions that look for an address on all
interfaces use the zone to pick the one interface to check, so a zone
that names an interface which does not hold the address is no longer
accepted. The command that lists the addresses is passed as a list, so
the interface name and the namespace do not reach a shell.

Unit tests and a smoketest cover the cases.

0 files changed, 0 insertions, 0 deletions