1 -- create nsdp protocol and its fields
2 p_nsdp = Proto ("nsdp","Netgear Switch Description Protocol")
3 -- local f_source = ProtoField.uint16("nsdp.src", "Source", base.HEX)
4 local f_type = ProtoField.uint16("nsdp.type", "Type", base.HEX)
5 local f_source = ProtoField.ether("nsdp.src", "Source", base.HEX)
6 local f_destination = ProtoField.ether("nsdp.dst", "Destination", base.HEX)
7 local f_seq = ProtoField.uint16("nsdp.seq", "Seq", base.HEX)
8 local f_data = ProtoField.string("nsdp.data", "Data", FT_STRING)
9 local f_cmd = ProtoField.uint16("nsdp.cmd", "Command", base.HEX)
10 local f_password = ProtoField.string("nsdp.password", "Password", FT_STRING)
11 local f_newpassword = ProtoField.string("nsdp.newpassword", "New password", FT_STRING)
13 --local f_debug = ProtoField.uint8("nsdp.debug", "Debug")
14 p_nsdp.fields = {f_type,f_source,f_destination,f_seq,f_cmd,f_password,f_newpassword}
16 -- nsdp dissector function
17 function p_nsdp.dissector (buf, pkt, root)
18 -- validate packet length is adequate, otherwise quit
19 if buf:len() == 0 then return end
20 pkt.cols.protocol = p_nsdp.name
22 -- create subtree for nsdp
23 subtree = root:add(p_nsdp, buf(0))
25 local ptype = buf(offset,2):uint()
26 subtree:add(f_type, ptype)
28 subtree:add(f_source, buf(offset,6))
30 subtree:add(f_destination, buf(offset,6))
32 subtree:add(f_seq, buf(offset,2))
35 if offset < buf:len() then
36 cmd = buf(offset, 2):uint()
39 subtree:add(f_cmd, cmd)
42 subtree:append_text(", init")
43 elseif cmd == 0xa or (ptype == 0x0104 and cmd == 0) then
44 if ptype == 0x0103 then
45 local pw_len = buf(offset, 2):uint()
47 subtree:add(f_password, buf(offset,pw_len))
48 offset = offset + pw_len
49 local next_up = buf(offset, 2):uint()
51 if next_up == 0x0009 then
52 subtree:append_text(", reset password")
53 pw_len = buf(offset, 2):uint()
55 subtree:add(f_newpassword, buf(offset,pw_len))
57 subtree:append_text(", login")
59 elseif ptype == 0x0104 then
60 if buf:len() == offset then
61 subtree:append_text(", password changed")
63 subtree:append_text(", logged in")
69 function p_nsdp.init()
73 local tcp_dissector_table = DissectorTable.get("udp.port")
74 dissector = tcp_dissector_table:get_dissector(63321)
75 tcp_dissector_table:add(63321, p_nsdp)
77 local tcp_dissector_table = DissectorTable.get("udp.port")
78 dissector = tcp_dissector_table:get_dissector(63322)
79 tcp_dissector_table:add(63322, p_nsdp)