calling a dissector fails with tvb subset in lua

Question

Hi,

I have an disssector that calls another post-dissector.

That works fine in Wireshark 2.2.0 with

function my_proto.dissector(tvb,pinfo,tree)
    local ptp_dissector_table = DissectorTable.get("ptp.data")
    local packet_dissector = ptp_dissector_table:get_dissector('ptp') 
    packet_dissector(tvb, pinfo, tree) 
 end

but fails as soon as I use

  packet_dissector(tvb(some_offset), pinfo, tree)

with 'Bad argument #2 to packet_dissector (Tvb expected, got userdata)

Any hints?

Accepted Answer

2

Use

packet_dissector(tvb:range(some_offset,some_length):tvb(), pinfo, tree)

(fixed according to the comment of @Thomas E).

permanent link

answered 21 Oct '16, 05:07

sindy
6.0k●4●8●51
accept rate: 24%

edited 21 Oct '16, 10:46

Actually it is

packet_dissector(tvb:range(some_offset,some_length):tvb(), pinfo, tree)

Thanks, Thomas

(21 Oct '16, 07:54) Thomas E

calling a dissector fails with tvb subset in lua

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