Hi,
Thomas has used the patch successful... here it is for inclusion in
ethereal.
This pactch adds the following features and some bug fixes to the ASN.1
dissector:
SCTP
assign more than one port for asn1 decoding
recovery from garbled or incomplete ASN.1 messages.
Please review and include in the ethereal SVN repository.
Thanks,
Matthijs Melchior wrote:
Thomas Steffen wrote:
Hi,
I am trying to use ethereal 0.10.5 for debugging a network application.
We use a custom protocol (in ASN.1) over SCTP. It nearly works, but
there are three outstanding issues:
1. I can't get ethereal to analyse the data sent over SCTP (beyond
giving a hex dump). If I send the same date over TCP, I can use
Decode-as->Transport and select ASN1. However, for an SCTP stream, the
Transport tab is not show. I guess this is a simple issue, but I don't
know where to look for it.
2. Is it possible to make ethereal recognise the ASN1 data automatically?
3. Is it possble to autodetect the PDU type? We have several different
message types, and they are defined as separate ASN.1 types.
Any suggestion would be very much appreciated. If changes to the code
are necessary, I should be able to do that, if someone could point me
into the correct direction...
Yours,
Thomas
I have a new version of packet-asn1.c available that also allows the
use of sctp.
This modification, and support for multiple ports with ASN.1 messages,
have been sitting on my disk for some time now, waiting for more testing...
And this seems to be a good opportunity.
To answer your questions:
1) this is possible with the new packet-asn1.c
2) yes, please read the text in the beginning of packet-asn1.c.
Just specify the port numbers used for your messages.
Using the ASN.1 sources, you can use the SNACC ASN.1 compiler to
build a 'type-table' that can be read by the ethereal asn1 plugin.
That will than display your messages with appropriate annotations.
3) I presume there is only 1 top level PDU type that is a choice
of all your different messages.... You have to specify that
PDU type as well.
I'll see if I can compile it with the current ethereal version
and send you the diff by a separate message, If successful, I will
submit it for inclusion in ethereal.
--
Regards,
---------------------------------------------------------------- -o)
Matthijs Melchior Maarssen /\\
mmelchior@xxxxxxxxx +31 346 570616 Netherlands _\_v
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