The Nebula Wireshark dissector uses bit32.band() when parsing the
Nebula packet type. On Wireshark builds using Lua 5.4, bit32 is not
available, which causes dissection to fail with:
Lua Error: nebula.lua:65: attempt to index a nil value (global 'bit32')
Wireshark bundles Lua BitOp and exposes it globally as bit for Lua
dissectors. This is the documented API for maximum backwards
compatibility across supported Lua versions.
Use bit.band() instead of bit32.band().
* Fix typo in Wireshark dissector
* Fix wireshark dissector prefs_changed logic
The previous logic had several issues:
- Changing only the port number (without toggling all_ports) would
not re-register the dissector on the new port.
- Turning all_ports off would remove all registrations but only
re-add the specific port inside a branch that also required
all_ports to have changed, and never updated default_settings.port.
Simplify to: remove all registrations, then register based on current
prefs, then update the cached state.
zorvios