mirror of
https://github.com/Lekensteyn/lglaf.git
synced 2024-11-14 11:25:29 -05:00
105 lines
3.6 KiB
Lua
105 lines
3.6 KiB
Lua
-- Wireshark Dissector for LG LAF protocol
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-- Tested with Wireshark 2.0
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--
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-- Place it in ~/.config/wireshark/plugins/
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-- (or ~/.wireshark/plugins/ if ~/.wireshark/ exists)
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--
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-- Alternatively start with: wireshark -X lua_script:path/to/lglaf.lua
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local lglaf = Proto("lglaf", "LG LAF")
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local usb_transfer_type = Field.new("usb.transfer_type")
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local success, usb_endpoint = pcall(Field.new, "usb.endpoint_number")
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if not success then
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-- Renamed since Wireshark v2.3.0rc0-1710-gf27f048ee1
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usb_endpoint = Field.new("usb.endpoint_address")
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end
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lglaf.fields.cmd = ProtoField.string("lglaf.command", "Command")
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lglaf.fields.arg1 = ProtoField.uint32("lglaf.arg1", "Argument 1", base.HEX_DEC)
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lglaf.fields.arg2 = ProtoField.uint32("lglaf.arg2", "Argument 2", base.HEX_DEC)
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lglaf.fields.arg3 = ProtoField.uint32("lglaf.arg3", "Argument 3", base.HEX_DEC)
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lglaf.fields.arg4 = ProtoField.uint32("lglaf.arg4", "Argument 4", base.HEX_DEC)
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lglaf.fields.len = ProtoField.uint32("lglaf.len", "Body length")
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lglaf.fields.crc = ProtoField.uint32("lglaf.crc", "CRC", base.HEX)
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lglaf.fields.cmd_inv = ProtoField.bytes("lglaf.command_inv", "Command (inverted)")
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lglaf.fields.body = ProtoField.bytes("lglaf.body", "Body")
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lglaf.fields.body_str = ProtoField.string("lglaf.body_str", "Body (text)")
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function dissect_tx(tvb, pinfo, tree)
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local i
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local offset = 0
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for i = 1, 2 do
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tree:add_le(lglaf.fields.opts, tvb(offset, 4))
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offset = offset + 4
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end
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return offset
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end
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function lglaf.dissector(tvb, pinfo, tree)
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local offset
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local transfer_type = usb_transfer_type().value
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local endpoint = usb_endpoint().value
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-- Process only bulk packets from (EP 5) and to the device (EP 3)
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if not ((endpoint == 0x85 or endpoint == 3) and transfer_type == 3) then
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return 0
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end
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pinfo.cols.protocol = lglaf.name
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local lglaf_tree = tree:add(lglaf, tvb())
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if tvb(0, 4):le_uint() ~= bit.bnot(tvb(0x1c, 4):le_uint()) then
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pinfo.cols.info:set("Continuation")
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return
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end
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local next_offset = 0
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function add_dword(field)
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next_offset = next_offset + 4
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field_tvb = tvb(next_offset - 4, 4)
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lglaf_tree:add_le(field, field_tvb)
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return field_tvb
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end
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add_dword(lglaf.fields.cmd)
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local v_args = {
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add_dword(lglaf.fields.arg1),
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add_dword(lglaf.fields.arg2),
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add_dword(lglaf.fields.arg3),
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add_dword(lglaf.fields.arg4),
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}
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local v_len = add_dword(lglaf.fields.len)
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add_dword(lglaf.fields.crc)
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add_dword(lglaf.fields.cmd_inv)
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pinfo.cols.info:set(tvb(0, 4):string() .. "(")
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for i, arg in ipairs(v_args) do
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if i > 1 then
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pinfo.cols.info:append(",");
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end
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pinfo.cols.info:append(arg:le_uint())
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end
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pinfo.cols.info:append(")")
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-- TODO desegmentation support
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local body_len = v_len:le_uint()
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if body_len > 0 then
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local body_tvb = tvb(next_offset, body_len)
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lglaf_tree:add(lglaf.fields.body, body_tvb)
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lglaf_tree:add(lglaf.fields.body_str, body_tvb)
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local body_summary = body_tvb:string()
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body_summary = string.gsub(body_summary, "\n", "\\n")
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if #body_summary > 50 then
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body_summary = string.sub(body_summary, 1, 80) .. "…"
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end
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pinfo.cols.info:append(" [" .. body_len .. "] " .. body_summary)
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end
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end
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function lglaf.init()
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local usb_product = DissectorTable.get("usb.product");
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usb_product:add(0x1004633e, lglaf) -- LG G3 (D855) or LG V10 (H962)
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usb_product:add(0x1004627f, lglaf) -- LG G3 (VS985)
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usb_product:add(0x10046298, lglaf) -- LG G4 (VS986)
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end
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