Wireshark · Wireshark-dev: [Wireshark-dev] Save extracted data from reassembled packets

[Peter Smith <psmith135@xxxxxxxxx>]

Hi,

I need to extract reassembled packet data in wireshark and either save it to file or better pass it over stdout to another program. In the latter case I guess it has to be converted to hex string for safe piping. 

I have the following code to get the reassembled WSP payload out of packet in wireshark

===================================

wsp_extractor = Field.new("wsp")

tap = Listener.new(nil,"wsp")

function tap.packet(pinfo,tvb)

local wsp_pdu =  wsp_extractor().range

if wsp_pdu then

print(tostring(wsp_pdu))

end

end

===================================

If the reassembled data comes from several packets I get the following error:

tshark: Lua: on packet 164 Error During execution of Listener Packet Callback:

expired tvb

If the extracted data is contained within one packet I get a truncated string:

8C849832333931423513363030406D6D732E6D74732E6279...

Apparently it should be a straightforward task but I am probably missing something... What am I doing wrong here?

Thanks.