User-Name containing an empty string.

Hello,

    I am working with a PSTN/VoIP gateway that can send an empty User-Name.
The released radiusd responds nothing or Access-Reject, depending on the
config reject-malformed-names value.

    Because I wanted radiusd to answer Access-Accept, I patched radiusd in
order to support a "accept-null-names" setup variable and added the
corresponding code to radiusd.[ch], auth.c and files.c ...

    Once my patch finished, I wondered if there was another and smartier way
to force radiusd to send a Access-Accept answer for null User-Name.

    Any idea for me ?