Wireshark · Wireshark-users: [Wireshark-users] Having problems searching Lua dissector data

[Robert Young <ryoung@xxxxxxxxxxxx>]

Hi there,

I'm trying to write my first Lua dissector for Wireshark.  I have a 
really simple dissector set up which I attached below.  It populates the 
data tree alright, but I would like to be able to search on the field I 
defined, wc.packetid.  wc.packetid shows up as a searchable type in the 
expression field, but doesn't seem to be populated.  Could someone tell 
me what I'm missing?

Thanks!
Rob Y


-- trivial protocol example
-- declare our protocol
trivial_proto = Proto("WC","WC Protocol")
-- create a function to dissect it

xdPacketFieldProto = ProtoField.uint32("wc.packetid", "Packet ID")

trivial_proto.fields = {wcPacketFieldProto}

function trivial_proto.dissector(buffer,pinfo,tree)
   pinfo.cols.protocol = "XC"
   local subtree = tree:add(trivial_proto,buffer(),"WC Protocol")
   subtree:add(ProtoField.uint32("xd.packetid", "Packet ID"),"Protocol 
Type is: " .. buffer(15,1):uint())
end

-- load the udp.port table
udp_table = DissectorTable.get("udp.port")

-- register our protocol to handle udp port 21230
udp_table:add(21230,trivial_proto)