Please ignore the previous response.
So The Wireshark will not identify your
dissector.
Basically lets assume your protocol
dissector runs under TCP then , if you have heuristically registered
Your dissector with the function
heur_dissector_add("tcp", dissect_your_protocol_tcp,
proto_your protocolrefernce);
Then TCP will handle the payload to your
dissector for further parsing.
Now if you know that the first two bytes
of the payload are a identifier
For your proticol then you can confirm it
and then only accept
To dissect to that packet otherwise you
can reject that.
That what I mean by setting certain
criteria to filter out your interest of packets.
Thanks
Hemant
From: Kumar, Hemant
Sent: Wednesday, August 27, 2008
3:11 PM
To: 'Developer support list for
Wireshark'
Subject: RE: [Wireshark-dev]
heuristic Dissector vs. normal dissector
The Wireshark will not identify your
dissector.
Basically lets assume your protocol
dissector runs under TCP then , if you have heuristically registered
Your dissector with the ffunction
heur_dissector_add("tcp",
dissect_your_protocol_tcp,
proto_your protocolrefernce);
From:
wireshark-dev-bounces@xxxxxxxxxxxxx
[mailto:wireshark-dev-bounces@xxxxxxxxxxxxx] On
Behalf Of Tom Stevens
Sent: Wednesday, August 27, 2008
2:57 PM
To: Developer support list for
Wireshark
Subject: Re: [Wireshark-dev]
heuristic Dissector vs. normal dissector
Thanks for the
information!
But, without a Port number, how can wireshark find (identify) the correct dissector
for the incoming packets. What are specific criteria? Maybe you can give me an
example. I'm a bit slow on the uptake at the moment.
Greetings Tom (Germany)
2008/8/27 Kumar, Hemant <kumarh@xxxxxxxxxxxx>
Basically Heuristic Dissector means that your dissector will
accept all the Traffic Packets and will not segregate based on port number.
So to identify your own custom dissector protocol messages
you have to separate out the packets based on certain criteria specific to your
Protocol.
And a normal dissector is registered with the Wireshark
based on port information which tells the Wireshark on which port your
message is
Going to be exchanges.
I hope it clarifies.
Hemant.
Hi!
What are the differences between a heuristic dissector and a normal dissector.
So far i have not considered heuristic dissectors, because I did not know what
they are and how to use them.
Maybe you can help!
Thanks in advance Tom (Germany)
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