Saving packet related information in pinfo.private_data

[Sidda Eraiah <sidda.eraiah () kaazing com>]

Hi

I am writing a dissector for a custom protocol and have a situation where
packets on the wire may contain one or more frames. Also one frame can
straddle across many packets. When I detect that a frame is straddling
across multiple packets I would like to be able to set some custom data on
pinfo to say how far I have progressed in getting the frame during the first
pass (while recording traffic). I need this information stored per packet,
as the dissector is can be called on random packet (due to user selecting
one packet in the UI).

I tried using pinfo.private_data and set some value on it by the following
code in the dissector method:

         print("pinfo.private_data: "..tostring(pinfo.private_data))
        pinfo.private_data = {"mydata", 1, 2, 3, 4}
        print("pinfo.private_data: "..tostring(pinfo.private_data))
        print(tostring(pinfo.private_data))

This prints out the following:


pinfo.private_data: userdata: 0x7fff1c257f20
pinfo.private_data: userdata: 0x7fff1c257f20
userdata: 0x7fff1c257f20



As you see the data that I am trying to set is not being retained in
pinfo.private_data.

*Is there a way to store some private data on pinfo that is retained next
time the dissector is called with the same packet? *

Any workaround or suggestion is appreciated.

I am using Version 1.2.7 of Wireshark on Ubuntu 10.04 LTS.

-- 
Best Regards,
Sidda

Director of Management Services
> |< Kaazing Corporation >|<
888, Villa St. Suite #410, Mountain View, CA 94041, USA

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