Ethereal-dev: Re: [Ethereal-dev] SCSI SPC-3 commands vs SPC-2 ...
Hi Richard,
On further investigating, I did find that there is something called
variable-length CDBs which you're alluding to. I thought that you were
interested in decoding OSD and since OSD has a special peripheral device type,
I suggested my first alternative.
It is quite easy to add a decoder for the overall variable-length CDB. However
to decode each of the service actions for such CDBs is another beast. I can
send a patch to handle variable-length CDBs quite soon, in about an hour or
so. I don't have any traces with variable-length CDB and so cannot test the
code.
Dinesh
Richard Sharpe writes:
> On Mon, 11 Mar 2002 ddutt@xxxxxxxxx wrote:
>
> > If you're attempting to decode OSD, the Inquiry response contains the
> > peripheral type as 0x11 (byte 0, bits 0-4). You can save this information in
> > the SCSI device type block and then decode later commands based on this.
>
> Hi Dinesh ....
>
> I would like to check my [somewhat limited] understanding of the SCSI spec
> and SPC-3 vs SBC etc.
>
> It seems to me that variable sized CDBs should have 0x7F as their OpCode
> byte, and should be distinguished from each other through the Action
> field. This field is a 16-bit field.
>
> If so, I will probably make some changes to the SCSI dissector, and then
> we can look to dissecting OSD.
>
> Is this correct?
>
> > Dinesh
> > Richard Sharpe writes:
> > > On Tue, 12 Mar 2002, Richard Sharpe wrote:
> > >
> > > > Hi,
> > > >
> > > > The current iSCSI dissector calls the SCSI dissector, which only
> > > > understands SPC-2 SCSI commands, it seems.
> > > >
> > > > I need to be able to dissect OSD commands, which are carried in a CDB with
> > > > an SPC-3 Variable Length CDB indicator (0x7F).
> > >
> > > Hmmm, the problem I am experiencing is because Ethereal's SCSI dissector
> > > currently only understands SPC-2, SBC-2, and SSC-2. If the CDB Operation
> > > Code is not found in the SPC-2 command set, tben the dissector searches
> > > among the SBC-2 command set ... Which is where 0X7F is found :-(
> > >
> > > So, I need some way to tell what type of device we are talking about.
> > > Better check what the iSCSI spec says. If it says SPC-3, then I can pass
> > > an arg to the SCSI dissector telling it what command set to use.
> > >
> > > > What I am interested in knowing is: Is there an easy way to determine
> > > > whether or not a stream is using SPC-3 or what? Is it carried in the iSCSI
> > > > PDU or logon or something like that?
> > > >
> > > >
> > >
> > > --
> > > Regards
> > > -----
> > > Richard Sharpe, rsharpe@xxxxxxxxxx, rsharpe@xxxxxxxxx,
> > > sharpe@xxxxxxxxxxxx
> > >
> > >
> > > _______________________________________________
> > > Ethereal-dev mailing list
> > > Ethereal-dev@xxxxxxxxxxxx
> > > http://www.ethereal.com/mailman/listinfo/ethereal-dev
> > >
> >
> >
>
> --
> Regards
> -----
> Richard Sharpe, rsharpe@xxxxxxxxxx, rsharpe@xxxxxxxxx,
> sharpe@xxxxxxxxxxxx
>
>
--
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you there. - Rumi
