Ethereal-dev: [Ethereal-dev] Re: Asn.1 and indefinite length.

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From: ronnie sahlberg <ronniesahlberg@xxxxxxxxx>
Date: Sun, 19 Jun 2005 21:37:23 -0400
The new packet-ber.c i just posted to the list  SHOULD handle that
case, at elast if the TAGs are either
SEQUENCE, SEQUENCE OF or SET OF.


On 5/20/05, Yuriy Sidelnikov <YSidelnikov@xxxxxxxx> wrote:
> Anders Broman wrote:
> Let's say we've sequence: 
> 
> af  - tag 1
>  80  - len1
>    72   - tag2
>      80  - len2
>     ... something related to tag2
>        ... something related to tag1
>        0000  - first delimeter(end of tag2)
>          0000 - second delimiter(end of tag1)
> a1     - another tags
>    8101
>       01
> a2
>    820001
>         01
> end of tvb. 
> 
> Both API will return wrong length, for example, for x'af' tag from x'72' to
> 
> the end of tvb buffer.But correct value will be from x'72' to  the second 
> delimeter. 
> 
> Regards,
> Yuriy. 
> 
> 
> >>Hi,
> >>analyzing some new ftam trace files I found that the indefinite length in
> >>the ASN.1 is not so rare thing as I thought.
> >>So I would like to have correct ASN.1 API.
> >>The question is that neither obsolete asn1.c nor new packet-ber.c can
> >>handle with the indefinite length in asn.1 stream.
> >>So what is the better:
> >>1.Add support for the indefinite length say "over" asn1.c.It is not very
> >>hard so we'll have working dissector pretty soon.Really I need only one
> >>thing more - to get correct length in case of the indefinite length.
> >>2.Try to use new api in the packet-ftam/acse/pres keeping in mind that
> >>somebody will be so kind to add the support for the indefinite length.
> It's
> >>not very easy way to go.  
> >>
> >>Regards,
> >>Yuriy Sidelnikov
> > 
> > As far as I know both packet-ber.c and the asn1.c handle at least some
> > indefinite lengths, what exactly is it you are missing? 
> > 
> > Best regards
> > Anders 
> > 
> > 
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