Re: GTP session plugin

["POZUELO Gloria (BCS/PSD)" <gloria.pozuelo () bics com>]

Thank you very much! It worked! I don’t know the utility of the scope parameter, I’ve set it  to NULL, is it correct?

From: wireshark-dev-bounces () wireshark org [mailto:wireshark-dev-bounces () wireshark org] On Behalf Of Pascal Quantin
Sent: Monday 2 November 2015 16:29
To: Developer support list for Wireshark
Subject: Re: [Wireshark-dev] GTP session plugin



2015-11-02 16:20 GMT+01:00 POZUELO Gloria (BCS/PSD) <gloria.pozuelo () bics com<mailto:gloria.pozuelo () bics com>>:
Hello!

I would like to ask you about a problem that I encountered while working in this development. I need to get the IP dst 
from the packet information and convert it to string (char *), but by inspecting the type _address I can see the data 
pointer, which I thought it would be the memory address of the final IP data, but I've checked if this integer 
correspond with the IP dst and turned out not to be the expected address. Could you help me with this matter? Is there 
a better way to get the IP address from pinfo and convert it to string?

Thank you very much in advance,

Regards.

Hi Gloria,
you did not indicate us which Wireshark version you are using, but assuming it's a recent one you are probably 
interested by the address_to_str() function found in epan/to_str.h file.
Best regards,
Pascal.
-----Original Message-----
From: Jeff Morriss [mailto:jeff.morriss.ws () gmail com<mailto:jeff.morriss.ws () gmail com>]
Sent: Friday 23 October 2015 20:56
To: Developer support list for Wireshark; POZUELO Gloria (BCS/PSD)
Subject: Re: [Wireshark-dev] GTP session plugin

On 10/22/15 03:43, POZUELO Gloria (BCS/PSD) wrote:
> Hi all,
>
> I get in touch with you, since I would like to develop a new plugin
> for GTP protocol (V1 and V2 versions). This functionality would
> consists of looking for all messages that belongs to the same session.
> For
> instance: you select from 1 to N Create Session Request or Create PDP
> Context and all the information about those sessions will be shown,
> this way you could export those specific packets.

It sounds like what you're describing is similar to what another of other dissectors (like TCP, SCTP, and I think 
SCCP).  You would basically need to modify the GTP dissector to build up state which includes information about each 
GTP session (similar to the way the TCP dissector builds up state information about each TCP connection).

I can't really offer any specific advice other than to look at how other dissectors do it.  If you want a starting 
point, look at the "tcp.stream" field (which uniquely identifies a TCP connection that the TCP dissector has found).  
Also you need to be aware that dissectors usually build up this state only on the first pass through the packets (when 
pinfo->fd->flags.visited is FALSE).


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