Great Circle Associates Firewalls
(March 1996)
 

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Subject: Re: CDROM Writer Drive as a firewall logfile 'dropsafe'?
From: Brian Murrell <murrell @ bctel . net>
Date: Fri, 15 Mar 1996 18:57:10 -0800 (PST)
To: long-morrow @ CS . YALE . EDU
Cc: firewalls @ GreatCircle . COM
In-reply-to: <199603160052 . TAA13954 @ SPARKY . CF . CS . YALE . EDU>

from the quill of long-morrow @
 CS .
 YALE .
 EDU on scroll
<199603160052 .
 TAA13954 @
 SPARKY .
 CF .
 CS .
 YALE .
 EDU>
> Or do you have to write an entire disk image to the CDROM at one time?

Well, that depends on how you want to write to it.  Keep in mind that when
you add and remove files from a filesystem, directories need to be updated.
 How do you update a directory structure in a filesystem on write-once
media.  The answer:  you don't.  There are devices out there that support
updating filesystems on WO media, but they usually "throw away" a directory
structure and create a new one when you change the contents of a directory.
 The "throw away" space is wasted.

If I were going to do this, I would write to the CDROM as a raw device. 
First byte of log entries at byte 0 of the CDROM.  Don't put a filesystem
on it.  It would be seekable much like looking through a file.

b.


--
Brian J. Murrell                                              murrell @
 bctel .
 net
BCTel Advanced Communications                                   brian @
 ilinx .
 com
Vancouver, B.C.                                                brian @
 wimsey .
 com
604 454 5279


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