Hi,
I thought that if there is 2 protocols, I should create 2 plugins. So if one protocol evolve, or is replaced, we only have to change one dissector, and we won't need to change the other. I thought it would be easier.
And so in the tree, where the data are dissected, we would have two lines: one for each protocol. In fact like for the Ethernet / IP / TCP...
Is it possible to do that with only one dissector?
And the two protocols are:
ASN.1 described protocol <= protocol used to transform satellite data into something understandable by all space agencies.
ISP <= little protocol used to transfer the data, make the bind and send Heartbeat messages to maintain connexion.
TCP
IP
...
For the ASN.1, I have already made a C program which transform data in ASN.1 into something I can display. Now, I just need to adapt this program for Wireshark. So I think it would be easier to use directly this, as I know how to use it and which parameters have to be selected by the user in Wireshark.
As the ISP protocol is specified by the OSI, I think it's not a private/proprietary protocol. Where can I send the code? By the mailing list? In fact there is almost nothing for the ISP protocol, so I won't be sure that it will help you if I send you my dissector.
Regards
Aurelien
Date: Thu, 23 Jul 2009 11:25:33 +0200
From: anders.broman@xxxxxxxxxxxx
To: wireshark-dev@xxxxxxxxxxxxx
Subject: Re: [Wireshark-dev] Using multiple layers of dissectors
Hi,
The ASN1
plugin is sort of deprecated (plugins/asn1/) and I think it is supposed to work
by loading ASN1 descriptions via som external tool
if I remember
correctly. The dissectors generated by asn2wrs relies on packet-per.c or
packet-ber.c to do the dissection depending
on the
encoding(PER/BER).
Why would you
need two .dll:s?
Is the
protocol private/proprietarry? If not make it a built in dissector and send
us the code(which protocol is it?).
As ASN1 is
used to describe a protocol is the stack more like:
Satelite
Message
ASN.1
described protocol
TCP
IP
:
If so you'll
need two dissectors I suppose one for the ASN1 protocol and one for the satelite
message they could be in the same
plugin dll (
see other plugins with multiple files).
Regards
Anders
Hi,
thank you for your answer.
In fact, my question was
more: is it possible to create 2 different plugins (2 different .dll files on
windows), to dissect something like
this:
http://imagik.fr/view-rl/93396
(A figure is better than a long
explanation, and I know that this figure is not really accurate for the
transmission layer.)
But thank you for your link! I was trying to build
the ASN.1 plugin by myself when I saw that he was already integrated in
Wireshark, so your link will help me a
lot!
Regards
Aurelien
Date: Thu, 23 Jul 2009 10:24:22 +0200
From: anders.broman@xxxxxxxxxxxx
To:
wireshark-dev@xxxxxxxxxxxxx
Subject: Re: [Wireshark-dev] Using multiple
layers of dissectors
Hi,
You should
use asn2wrs to generate the asn1 part of your protocol see
Regards
Anders
Hi!
I have been searching this on Internet, but I don't find
any solution, this is why I write to you.
I have built a first dissector for
Wireshark. Now, I know that for some kind of messages from this protocol, the
data it contains are encoded with an other protocol (ASN.1, to be
accurate).
So I would like to know what I have to put in my dissector code
and where, to make the data dissected by the ASN.1
dissector.
Thanks
Aurelien
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