Wireshark · Wireshark-dev: Re: [Wireshark-dev] GTP session plugin

[Pascal Quantin <pascal.quantin@xxxxxxxxx>]

2015-11-02 16:20 GMT+01:00 POZUELO Gloria (BCS/PSD) <gloria.pozuelo@xxxxxxxx>:

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@xxxxxxxxx]
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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