Wireshark-bugs: [Wireshark-bugs] [Bug 3513] Lua dissector field registration broken
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From: bugzilla-daemon@xxxxxxxxxxxxx
Date: Wed, 13 Feb 2013 04:08:45 +0000

changed bug 3513

What Removed Added
CC   hadrielk@yahoo.com

Comment # 7 on bug 3513 from 
For the problem of:
"bad argument #1 to 'new' (Field_new: a field with this name must exist)"

This happens because the registration of new custom ProtoFields doesn't happen
until Proto_commit() is called at the end of wslua_init(), which is after all
the Lua plugins/scripts have been loaded.  So Field.new() fails because the
custom proto field is not yet truly registered, and you can't use Field.new()
afterwards - it can only be used during initial loading in the main script
body, not within dissector/tap callbacks.  So basically right now Field.new()
is only useful for the pre-existing C-code field types.

It's not clear why registering the new fields and subtrees has to be done so
late and in the fashion they are, though.

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