> I'd recommend checking the next four octets as well; they'll be "00 00 00 00"
> or "00 00 00 01".
I've hacked up a magic(5) file which seems to work for me:
$ file *
inline.aa: BIND raw format zone file < v9.9
inline.aa.jnl: BIND journal file v9
inline.aa.signed: BIND raw format zone file < v9.9
inline.aa.signed.jnl: BIND journal file v9
I'm attaching the file I dropped into /usr/share/file/magic/
-JP
#------------------------------------------------------------------------------
# bind: file(1) magic for BIND zone file binary formats
#
# By JP Mens from information given by Evan Hunt
# > I've looked at a few of them, and I noticed that all the ones I've seen
# > start with the four-octet string "00 00 00 02". Is that sufficient?
#
# I'd recommend checking the next four octets as well; they'll be "00 00 00 00"
# or "00 00 00 01". The first of those is the format that's always been used
# up to now; the second is the format that will be used in 9.9.0, starting
# with the next beta.
#
0 belong &0x00000000 BIND raw format zone file
>4 belong &0x00000000 < v9.9
>4 belong &0x00000001 >= v9.9
0 string ;BIND\ LOG\ V9 BIND journal file v9
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