Re[2]: Help - How to unwind an SRS address?

Hi Koen,

I just want to extract the original senders email address, not verify
anything at this stage.  I know enough to work out that your
simplistic overview is not helpful to me, since I read that "==" might
be "=+" or "=-" depending one something I couldn't fathom, and I've no
idea if SRS2 has more or less "="'s, or if SRS0 has more or less, or
if "HHH" (which is not 3 characters I know, from inspection of SRS
problems I've got already) or TT can contain other funny chars (I'd
guess not "="'s, but I don't want to guess), and I don't know if SRS
can handle existing email addresses starting with "srs0..." or others
containing "=" or if it escapes things or obliterates the original
senders details after a certain number of hops etc etc... hence my
last-resort asking of this question here :-)

The spec also says that the number after "SRS" is a "Version", but
then seems to change it's mind and use it as a "hop" counter instead,
so how are future versions of SRS going to differentiate themselves,
and if hops exceed 9 does the next digit become "a" or do I expect two
decimals, etc etc etc...

Kind Regards,
Chris Drake

Saturday, November 20, 2004, 10:12:11 PM, you wrote:

KM> Hi,

KM> There is no regex to do so, since you need to verify the crypthographic
KM> cookie. Without the secret key, you won't be able too. Of course you can
KM> just rewrite it ignoring the cookie, but that isn't something I advice
KM> (depending on the application of course).

KM> You can use libsrs or libsrs2 or some perl implementation to do reverse
KM> rewrite of an srs address if you know the secret's. 

KM> If you want to ignore the cryptographic cookie, look at
KM> http://www.libsrs2.org/srs/srs.pdf, it clearly states the SRS0 and SRS1
KM> address format:

KM> SRS0=HHH=TT=hostname=local-part@local-host

KM> So the original address is local-part@hostname

KM> SRS1=HHH=first-forwarder==HHH=TT=hostname=local-part@local-host

KM> And again, the original address is local-part@hostname

KM> There ya go,

KM> Koen


KM> On Sat, Nov 20, 2004 at 10:00:17PM +1100, Chris Drake wrote:
>> Hi,
>> 
>> Please can someone give me a regex or *simple* instructions on how to
>> reconstruct the real senders email address from an SRS one (pref
>> without installing anything)?
>> 
>> And yes - I've looked at the docs, but there's loads and loads of
>> detail - *so* much that I can't figure out easily how to do this with
>> any confidence that it's going to work properly or indefinitely!
>> 
>> Many thanks to anyone who can help!
>> 
>> Kind Regards,
>> Chris Drake
>> 
>> 
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