How to attach a protocol to the ethernet dissector table (Lua script)

[Benoit]

I'm actually using a simple protocol to communicate between FPGA and i would
like to parse it by wireshark.
I actually have a lua script which works well on the UDP but i would like to
use only ethernet frame (the protocol should be define by the ethernet
type).



s4n_proto = Proto("s4n","S4N","S4N Protocol")
-- create a function to dissect it
function s4n_proto.dissector(buffer,pinfo,tree)
pinfo.cols.protocol = "S4N"
...
end


-- load the udp.port table
udp_table = DissectorTable.get("udp.port")
-- register our protocol to handle udp port 18000
udp_table:add(18000,s4n_proto)

But now i would like to replace this last lines by:
eth_table = DissectorTable.get("eth.type")
eth_table:add(18000,s4n_proto)

However, i've a probleme the eth.type is no a dissector table therefore I
don't know how to do to simply register a simple lua protocol to an ethernet
type/protocol.


Thanks.


--
Benoit RAT
www.neub.co.nr

[Abhik Sarkar]

A quick look at packet-ip.c suggests the table name is "ethertype".

Post by Benoit
I'm actually using a simple protocol to communicate between FPGA and i would
like to parse it by wireshark.
I actually have a lua script which works well on the UDP but i would like to
use only ethernet frame (the protocol should be define by the ethernet
type).
s4n_proto = Proto("s4n","S4N","S4N Protocol")
-- create a function to dissect it
function s4n_proto.dissector(buffer,
pinfo,tree)
pinfo.cols.protocol = "S4N"
...
end
-- load the udp.port table
udp_table = DissectorTable.get("udp.port")
-- register our protocol to handle udp port 18000
udp_table:add(18000,s4n_proto)
eth_table = DissectorTable.get("eth.type")
eth_table:add(18000,s4n_proto)
However, i've a probleme the eth.type is no a dissector table therefore I
don't know how to do to simply register a simple lua protocol to an ethernet
type/protocol.
Thanks.
--
Benoit RAT
www.neub.co.nr
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