103 lines
3.1 KiB
Lua
103 lines
3.1 KiB
Lua
--
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-- NMRP dissector for Wireshark
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--
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-- Copyright (C) 2016 Joseph C. Lehner
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--
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-- Licensed under the GNU GPL 3.0
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--
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nmrp_proto = Proto("nmrp", "NMRP")
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src_f = ProtoField.string("nmrp.src", "Source")
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dst_f = ProtoField.string("nmrp.dst", "Destination")
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code_f = ProtoField.uint8("nmrp.code", "Code", base.HEX)
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id_f = ProtoField.uint8("nmrp.id", "ID", base.HEX)
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reserved_f = ProtoField.uint16("nmrp.reserved", "Reserved", base.HEX)
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len_f = ProtoField.uint16("nmrp.len", "Length")
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data_f = ProtoField.bytes("nmrp.opt", "Options")
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opt_type_f = ProtoField.uint16("nmrp.opt.type", "Option", base.HEX)
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opt_len_f = ProtoField.uint16("nmrp.opt.len", "Length")
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opt_data_f = ProtoField.bytes("nmrp.opt.data", "Data")
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nmrp_proto.fields = {
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code_f, reserved_f, len_f, data_f, id_f, opt_type_f, opt_len_f, opt_data_f
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}
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function nmrp_code(code)
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if code == 1 then return { "ADVERTISE", "Advertise" }
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elseif code == 2 then return { "CONF_REQ", "Configuration Request" }
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elseif code == 3 then return { "CONF_ACK", "Configuration" }
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elseif code == 4 then return { "CLOSE_REQ", "Close Request" }
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elseif code == 5 then return { "CLOSE_ACK", "Close Acknowledgement" }
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elseif code == 6 then return { "KEEP_ALIVE_REQ", "Keep-alive Request" }
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elseif code == 7 then return { "KEEP_ALIVE_ACK", "Keep-alive Acknowledgement" }
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elseif code == 16 then return { "TFTP_UL_REQ", "Upload Request" }
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else return { "#" .. code, "Unknown Opcode " .. code }
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end
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end
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function nmrp_opt(opt)
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if opt == 0x01 then return "Magic"
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elseif opt == 0x02 then return "IP Configuration"
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elseif opt == 0x04 then return "Region"
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elseif opt == 0x0101 then return "Update Firmware"
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elseif opt == 0x0102 then return "Update String Table"
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elseif opt == 0x0181 then return "Filename"
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else return "#" .. opt
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end
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end
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function nmrp_dissect_opt(opt, buffer, tree)
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if buffer:len() <= 4 then
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return
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end
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if opt == 0x01 or opt == 0x0181 then
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tree:add(buffer(4), "Value: " .. buffer(4):string())
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elseif opt == 0x02 then
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tree:add(buffer(4, 4), "Address: " .. tostring(buffer(4, 4):ipv4()))
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tree:add(buffer(8, 4), "Netmask: " .. tostring(buffer(8, 4):ipv4()))
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else
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tree:add(opt_len_f, buffer(2, 2))
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tree:add(opt_data_f, buffer(4, buffer:len() - 4))
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end
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end
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function nmrp_proto.dissector(buffer, pinfo, tree)
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pinfo.cols.protocol = "NMRP"
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local code = buffer(2, 1)
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local len = buffer(4, 2)
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pinfo.cols.info = nmrp_code(code:uint())[2]
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local subtree = tree:add(nmrp_proto, buffer(0))
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subtree:add(code_f, code):append_text(" - " .. nmrp_code(code:uint())[2])
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subtree:add(id_f, buffer(3, 1))
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subtree:add(len_f, len)
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subtree:add(reserved_f, buffer(0, 2))
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local databuf = buffer(6, len:uint() - 6)
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while databuf:len() > 0 do
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local opt = databuf(0, 2):uint()
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local optlen = databuf(2, 2):uint()
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if databuf:len() < optlen then
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break
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end
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local optitem = subtree:add(opt_type_f, databuf(0, 2)):append_text(" - " .. nmrp_opt(opt))
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nmrp_dissect_opt(opt, databuf(0, optlen), optitem)
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if databuf:len() > optlen then
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databuf = databuf(optlen)
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else
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break
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end
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end
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end
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eth_table = DissectorTable.get("ethertype")
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eth_table:add(0x0912, nmrp_proto)
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