frame.len not working as expected in Lua

frame.len
lua
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I want to use the frame.len to further dissect the packet. I used the following logic and it failed:

   frame_len_f     = Field.new("frame.len")
   local frame_len = frame_len_f()
   if frame_len == 62 then 
        local data_data   = data_data_f()
        local s_data_data = tostring(data_data)
        subtree:add(data_data_F,s_data_data)
   end

However, if I convert frame.len to string and compare to "62", it works:

   frame_len_f     = Field.new("frame.len")
   local frame_len = frame_len_f()
   local s_frame_len = tostring(frame_len)
   if s_frame_len == "62" then 
        local data_data   = data_data_f()
        local s_data_data = tostring(data_data)
        subtree:add(data_data_F,s_data_data)
   end

Can anyone explain what I did wrong in the first case. Thanks

derekyu

asked 2017-12-20 03:45:45 +0000

2.1k

Christian_R

updated 2017-12-21 10:40:29 +0000

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Thanks. That works. According to https://www.wireshark.org/docs/dfref/..., frame.len is an unsigned integer. It seems using Field.new() to obtain the value changes it to a Fieldinfo object. Is there a easy way to get the frame.len?

derekyu (2017-12-20 19:13:22 +0000) edit

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frame.len not working as expected in Lua edit

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