Wireshark-bugs: [Wireshark-bugs] [Bug 8131] usb dissector fails to identify SCSI payload (MASSTO
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From: bugzilla-daemon@xxxxxxxxxxxxx
Date: Mon, 24 Dec 2012 10:16:04 +0000

Comment # 2 on bug 8131 from 
(In reply to comment #1)
> There is no possibility to recognize that device as MassStorage.

According to

    http://bobcopeland.com/blog/2011/07/my-pal-scsi/

"USB storage is a successful example of taking an existing protocol (SCSI
command set) and wholesale wrapping it in a different wire protocol. Each USB
storage transfer is initiated by the host sending a Command Block Wrapper (CBW)
— a 31-byte USB packet starting with ‘USBC’, typically containing a SCSI
command as a payload. Next, a block of data is transferred if this command
represents a read or write. Finally, the device completes the transaction by
sending a Command Status Wrapper (CSW), a 13-byte packet beginning with the
string ‘USBS’."

If that's the case, perhaps there should either be a dissector table that looks
at the 4 bytes in question or, if no USB spec indicates that those are a
protocol identifier field, a heuristic dissector list allowing a "USB mass
storage" dissector to look for USBC or USBS.

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