more WIP

1 files changed, 49 insertions, 0 deletions

diff --git a/wireshark/melon.lua b/wireshark/melon.lua
new file mode 100644
index 0000000..a431781
--- /dev/null
+++ b/wireshark/melon.lua
@@ -0,0 +1,49 @@
+local p = Proto("melon", "MelonDS packet header")
+local dt = DissectorTable.new("melon")
+
+p.fields.magic = ProtoField.uint32("melon.magic", "Magic", base.HEX)
+p.fields.src = ProtoField.int32("melon.src", "Instance ID", base.DEC)
+p.fields.type = ProtoField.new("Type", "melon.type", ftypes.UINT32)
+p.fields.type_enum = ProtoField.uint16("melon.type.enum", "Numeric message type enum", base.DEC, {
+	[0] = "Regular",
+	[1] = "CMD",
+	[2] = "Reply",
+	[3] = "ACK",
+})
+p.fields.type_aid = ProtoField.uint16("melon.type.aid", "Message type \"aid\" value")
+p.fields.length = ProtoField.uint32("melon.len", "Remaining message length", base.DEC)
+p.fields.timestamp = ProtoField.uint64("melon.timestamp", "Timestamp", base.DEC)
+
+local p_type_enum_field = Field.new("melon.type.enum")
+
+function p.dissector(buffer, pinfo, tree)
+	local header_size = 0x18
+
+	-- check magic ("NIFI")
+	if buffer(0x00, 4):uint() ~= 0x4e494649 then return end
+
+	local subtree = tree:add(p, buffer(0, header_size), string.format("%s: %d bytes", p.description, header_size))
+	subtree:add(p.fields.magic, buffer(0x00, 4))
+
+	local instance = buffer(0x04, 4):le_uint()
+	subtree:add_le(p.fields.src, buffer(0x04, 4))
+
+	local type_tree = subtree:add_le(p.fields.type, buffer(0x08, 4))
+		type_tree:add_le(p.fields.type_enum, buffer(0x08, 2))
+		type_tree:add_le(p.fields.type_aid, buffer(0x0a, 2))
+
+	subtree:add_le(p.fields.length, buffer(0x0c, 4))
+	subtree:add_le(p.fields.timestamp, buffer(0x10, 8))
+
+	-- pretty wireshark shit
+	pinfo.cols.protocol = p.name
+	pinfo.cols.src = string.format("instance %d", instance)
+	pinfo.cols.info = p_type_enum_field().display
+
+	-- melonds packets always contain NIFI packets, I use 0 as the pattern
+	-- because this function doesn't seem to like nil
+	dt:try(0, buffer(header_size):tvb(), pinfo, tree)
+
+	return header_size
+end
+