mirror of
https://github.com/moparisthebest/minetest
synced 2024-11-18 07:15:07 -05:00
1286 lines
41 KiB
Lua
1286 lines
41 KiB
Lua
-- minetest.lua
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-- Packet dissector for the UDP-based Minetest protocol
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-- Copy this to $HOME/.wireshark/plugins/
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--
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-- Minetest-c55
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-- Copyright (C) 2011 celeron55, Perttu Ahola <celeron55@gmail.com>
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--
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-- This program is free software; you can redistribute it and/or modify
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-- it under the terms of the GNU General Public License as published by
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-- the Free Software Foundation; either version 2 of the License, or
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-- (at your option) any later version.
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--
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-- This program is distributed in the hope that it will be useful,
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-- but WITHOUT ANY WARRANTY; without even the implied warranty of
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-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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-- GNU General Public License for more details.
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--
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-- You should have received a copy of the GNU General Public License along
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-- with this program; if not, write to the Free Software Foundation, Inc.,
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-- 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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--
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-- Table of Contents:
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-- Part 1: Client command dissectors (TOSERVER_*)
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-- Part 2: Server command dissectors (TOCLIENT_*)
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-- Part 3: Wrapper protocol subdissectors
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-- Part 4: Wrapper protocol main dissector
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-- Part 5: Utility functions
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--------------------------------------------
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-- Part 1 --
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-- Client command dissectors (TOSERVER_*) --
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--------------------------------------------
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minetest_client_commands = {}
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minetest_client_obsolete = {}
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-- TOSERVER_INIT
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do
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local f_ser_fmt = ProtoField.uint8("minetest.client.init_ser_version",
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"Maximum serialization format version", base.DEC)
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local f_player_name = ProtoField.stringz("minetest.client.init_player_name", "Player Name")
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local f_password = ProtoField.stringz("minetest.client.init_password", "Password")
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local f_version = ProtoField.uint16("minetest.client.init_version", "Version", base.DEC)
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minetest_client_commands[0x10] = {
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"INIT", -- Command name
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53, -- Minimum message length including code
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{ f_ser_fmt, -- List of fields [optional]
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f_player_name,
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f_password,
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f_version },
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function(buffer, pinfo, tree, t) -- Dissector function [optional]
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t:add(f_ser_fmt, buffer(2,1))
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t:add(f_player_name, buffer(3,20))
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t:add(f_password, buffer(23,28))
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t:add(f_version, buffer(51,2))
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end
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}
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end
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-- TOSERVER_INIT2
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minetest_client_commands[0x11] = { "INIT2", 2 }
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-- TOSERVER_GETBLOCK (obsolete)
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minetest_client_commands[0x20] = { "GETBLOCK", 2 }
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minetest_client_obsolete[0x20] = true
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-- TOSERVER_ADDNODE (obsolete)
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minetest_client_commands[0x21] = { "ADDNODE", 2 }
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minetest_client_obsolete[0x21] = true
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-- TOSERVER_REMOVENODE (obsolete)
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minetest_client_commands[0x22] = { "REMOVENODE", 2 }
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minetest_client_obsolete[0x22] = true
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-- TOSERVER_PLAYERPOS
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do
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local f_x = ProtoField.int32("minetest.client.playerpos_x", "Position X", base.DEC)
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local f_y = ProtoField.int32("minetest.client.playerpos_y", "Position Y", base.DEC)
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local f_z = ProtoField.int32("minetest.client.playerpos_z", "Position Z", base.DEC)
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local f_speed_x = ProtoField.int32("minetest.client.playerpos_speed_x", "Speed X", base.DEC)
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local f_speed_y = ProtoField.int32("minetest.client.playerpos_speed_y", "Speed Y", base.DEC)
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local f_speed_z = ProtoField.int32("minetest.client.playerpos_speed_z", "Speed Z", base.DEC)
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local f_pitch = ProtoField.int32("minetest.client.playerpos_pitch", "Pitch", base.DEC)
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local f_yaw = ProtoField.int32("minetest.client.playerpos_yaw", "Yaw", base.DEC)
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minetest_client_commands[0x23] = {
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"PLAYERPOS", 34,
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{ f_x, f_y, f_z, f_speed_x, f_speed_y, f_speed_z, f_pitch, f_yaw },
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function(buffer, pinfo, tree, t)
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t:add(f_x, buffer(2,4))
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t:add(f_y, buffer(6,4))
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t:add(f_z, buffer(10,4))
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t:add(f_speed_x, buffer(14,4))
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t:add(f_speed_y, buffer(18,4))
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t:add(f_speed_z, buffer(22,4))
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t:add(f_pitch, buffer(26,4))
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t:add(f_yaw, buffer(30,4))
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end
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}
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end
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-- TOSERVER_GOTBLOCKS
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do
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local f_count = ProtoField.uint8("minetest.client.gotblocks_count", "Count", base.DEC)
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local f_block = ProtoField.bytes("minetset.client.gotblocks_block", "Block", base.DEC)
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local f_x = ProtoField.int16("minetest.client.gotblocks_x", "Block position X", base.DEC)
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local f_y = ProtoField.int16("minetest.client.gotblocks_y", "Block position Y", base.DEC)
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local f_z = ProtoField.int16("minetest.client.gotblocks_z", "Block position Z", base.DEC)
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minetest_client_commands[0x24] = {
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"GOTBLOCKS", 3,
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{ f_count, f_block, f_x, f_y, f_z },
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function(buffer, pinfo, tree, t)
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t:add(f_count, buffer(2,1))
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local count = buffer(2,1):uint()
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if minetest_check_length(buffer, 3 + 6*count, t) then
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pinfo.cols.info:append(" * " .. count)
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local index
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for index = 0, count - 1 do
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local pos = 3 + 6*index
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local t2 = t:add(f_block, buffer(pos, 6))
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t2:set_text("Block, X: " .. buffer(pos, 2):int()
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.. ", Y: " .. buffer(pos + 2, 2):int()
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.. ", Z: " .. buffer(pos + 4, 2):int())
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t2:add(f_x, buffer(pos, 2))
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t2:add(f_y, buffer(pos + 2, 2))
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t2:add(f_z, buffer(pos + 4, 2))
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end
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end
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end
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}
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end
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-- TOSERVER_DELETEDBLOCKS
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-- TODO: Test this
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do
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local f_count = ProtoField.uint8("minetest.client.deletedblocks_count", "Count", base.DEC)
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local f_block = ProtoField.bytes("minetset.client.deletedblocks_block", "Block", base.DEC)
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local f_x = ProtoField.int16("minetest.client.deletedblocks_x", "Block position X", base.DEC)
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local f_y = ProtoField.int16("minetest.client.deletedblocks_y", "Block position Y", base.DEC)
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local f_z = ProtoField.int16("minetest.client.deletedblocks_z", "Block position Z", base.DEC)
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minetest_client_commands[0x25] = {
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"DELETEDBLOCKS", 3,
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{ f_count, f_block, f_x, f_y, f_z },
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function(buffer, pinfo, tree, t)
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t:add(f_count, buffer(2,1))
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local count = buffer(2,1):uint()
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if minetest_check_length(buffer, 3 + 6*count, t) then
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pinfo.cols.info:append(" * " .. count)
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local index
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for index = 0, count - 1 do
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local pos = 3 + 6*index
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local t2 = t:add(f_block, buffer(pos, 6))
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t2:set_text("Block, X: " .. buffer(pos, 2):int()
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.. ", Y: " .. buffer(pos + 2, 2):int()
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.. ", Z: " .. buffer(pos + 4, 2):int())
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t2:add(f_x, buffer(pos, 2))
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t2:add(f_y, buffer(pos + 2, 2))
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t2:add(f_z, buffer(pos + 4, 2))
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end
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end
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end
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}
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end
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-- TOSERVER_ADDNODE_FROM_INVENTORY (obsolete)
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minetest_client_commands[0x26] = { "ADDNODE_FROM_INVENTORY", 2 }
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minetest_client_obsolete[0x26] = true
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-- TOSERVER_CLICK_OBJECT
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-- TODO: Test this
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do
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local vs_button = {
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[0] = "left",
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[1] = "right"
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}
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local f_button = ProtoField.uint8("minetest.client.click_object_button", "Button", base.DEC, vs_button)
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local f_blockpos_x = ProtoField.int16("minetest.client.click_object_blockpos_x", "Block position X", base.DEC)
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local f_blockpos_y = ProtoField.int16("minetest.client.click_object_blockpos_y", "Block position Y", base.DEC)
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local f_blockpos_z = ProtoField.int16("minetest.client.click_object_blockpos_z", "Block position Z", base.DEC)
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local f_id = ProtoField.int16("minetest.client.click_object_id", "ID", base.DEC)
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local f_item = ProtoField.uint16("minetest.client.click_object_item", "Item", base.DEC)
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minetest_client_commands[0x27] = {
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"CLICK_OBJECT", 13,
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{ f_button, f_blockpos_x, f_blockpos_y, f_blockpos_z, f_id, f_item },
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function(buffer, pinfo, tree, t)
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t:add(f_button, buffer(2,1))
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t:add(f_blockpos_x, buffer(3,2))
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t:add(f_blockpos_y, buffer(5,2))
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t:add(f_blockpos_z, buffer(7,2))
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t:add(f_id, buffer(9,2))
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t:add(f_item, buffer(11,2))
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end
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}
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end
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-- TOSERVER_GROUND_ACTION
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do
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local vs_action = {
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[0] = "Start digging",
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[1] = "Place block",
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[2] = "Stop digging",
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[3] = "Digging completed"
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}
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local f_action = ProtoField.uint8("minetest.client.ground_action", "Action", base.DEC, vs_action)
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local f_nodepos_undersurface_x = ProtoField.int16(
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"minetest.client.ground_action_nodepos_undersurface_x",
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"Node position (under surface) X")
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local f_nodepos_undersurface_y = ProtoField.int16(
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"minetest.client.ground_action_nodepos_undersurface_y",
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"Node position (under surface) Y")
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local f_nodepos_undersurface_z = ProtoField.int16(
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"minetest.client.ground_action_nodepos_undersurface_z",
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"Node position (under surface) Z")
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local f_nodepos_abovesurface_x = ProtoField.int16(
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"minetest.client.ground_action_nodepos_abovesurface_x",
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"Node position (above surface) X")
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local f_nodepos_abovesurface_y = ProtoField.int16(
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"minetest.client.ground_action_nodepos_abovesurface_y",
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"Node position (above surface) Y")
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local f_nodepos_abovesurface_z = ProtoField.int16(
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"minetest.client.ground_action_nodepos_abovesurface_z",
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"Node position (above surface) Z")
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local f_item = ProtoField.uint16("minetest.client.ground_action_item", "Item")
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minetest_client_commands[0x28] = {
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"GROUND_ACTION", 17,
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{ f_action,
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f_nodepos_undersurface_x,
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f_nodepos_undersurface_y,
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f_nodepos_undersurface_z,
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f_nodepos_abovesurface_x,
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f_nodepos_abovesurface_y,
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f_nodepos_abovesurface_z,
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f_item },
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function(buffer, pinfo, tree, t)
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t:add(f_action, buffer(2,1))
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t:add(f_nodepos_undersurface_x, buffer(3,2))
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t:add(f_nodepos_undersurface_y, buffer(5,2))
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t:add(f_nodepos_undersurface_z, buffer(7,2))
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t:add(f_nodepos_abovesurface_x, buffer(9,2))
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t:add(f_nodepos_abovesurface_y, buffer(11,2))
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t:add(f_nodepos_abovesurface_z, buffer(13,2))
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t:add(f_item, buffer(15,2))
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end
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}
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end
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-- TOSERVER_RELEASE (obsolete)
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minetest_client_commands[0x29] = { "RELEASE", 2 }
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minetest_client_obsolete[0x29] = true
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-- TOSERVER_SIGNTEXT (old signs)
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-- TODO: Test this or mark obsolete
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do
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local f_blockpos_x = ProtoField.int16("minetest.client.signtext_blockpos_x", "Block position X", base.DEC)
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local f_blockpos_y = ProtoField.int16("minetest.client.signtext_blockpos_y", "Block position Y", base.DEC)
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local f_blockpos_z = ProtoField.int16("minetest.client.signtext_blockpos_z", "Block position Z", base.DEC)
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local f_id = ProtoField.int16("minetest.client.signtext_id", "ID", base.DEC)
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local f_textlen = ProtoField.uint16("minetest.client.signtext_textlen", "Text length", base.DEC)
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local f_text = ProtoField.string("minetest.client.signtext_text", "Text")
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minetest_client_commands[0x30] = {
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"SIGNTEXT", 12,
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{ f_blockpos_x, f_blockpos_y, f_blockpos_z, f_id, f_textlen, f_text },
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function(buffer, pinfo, tree, t)
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t:add(f_blockpos_x, buffer(2,2))
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t:add(f_blockpos_y, buffer(4,2))
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t:add(f_blockpos_z, buffer(6,2))
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t:add(f_id, buffer(8,2))
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t:add(f_textlen, buffer(10,2))
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local textlen = buffer(10,2):uint()
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if minetest_check_length(buffer, 12 + textlen, t) then
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t:add(f_text, buffer, buffer(12,textlen))
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end
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end
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}
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end
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-- TOSERVER_INVENTORY_ACTION
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do
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local f_action = ProtoField.string("minetest.client.inventory_action", "Action")
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minetest_client_commands[0x31] = {
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"INVENTORY_ACTION", 2,
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{ f_action },
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function(buffer, pinfo, tree, t)
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t:add(f_action, buffer(2, buffer:len() - 2))
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end
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}
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end
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-- TOSERVER_CHAT_MESSAGE
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do
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local f_length = ProtoField.uint16("minetest.client.chat_message_length", "Length", base.DEC)
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local f_message = ProtoField.string("minetest.client.chat_message", "Message")
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minetest_client_commands[0x32] = {
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"CHAT_MESSAGE", 4,
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{ f_length, f_message },
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function(buffer, pinfo, tree, t)
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t:add(f_length, buffer(2,2))
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local textlen = buffer(2,2):uint()
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if minetest_check_length(buffer, 4 + textlen*2, t) then
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t:add(f_message, minetest_convert_utf16(buffer(4, textlen*2), "Converted chat message"))
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end
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end
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}
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end
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-- TOSERVER_SIGNNODETEXT
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do
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local f_pos_x = ProtoField.int16("minetest.client.signnodetext_pos_x", "Block position X", base.DEC)
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local f_pos_y = ProtoField.int16("minetest.client.signnodetext_pos_y", "Block position Y", base.DEC)
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local f_pos_z = ProtoField.int16("minetest.client.signnodetext_pos_z", "Block position Z", base.DEC)
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local f_textlen = ProtoField.uint16("minetest.client.signnodetext_textlen", "Text length", base.DEC)
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local f_text = ProtoField.string("minetest.client.signnodetext_text", "Text")
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minetest_client_commands[0x33] = {
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"SIGNNODETEXT", 10,
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{ f_pos_x, f_pos_y, f_pos_z, f_textlen, f_text },
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function(buffer, pinfo, tree, t)
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t:add(f_pos_x, buffer(2,2))
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t:add(f_pos_y, buffer(4,2))
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t:add(f_pos_z, buffer(6,2))
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t:add(f_textlen, buffer(8,2))
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local textlen = buffer(8,2):uint()
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if minetest_check_length(buffer, 10 + textlen, t) then
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t:add(f_text, buffer(10, textlen))
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end
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end
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}
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end
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-- TOSERVER_CLICK_ACTIVEOBJECT
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do
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local vs_button = {
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[0] = "left",
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[1] = "right"
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}
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local f_button = ProtoField.uint8("minetest.client.click_activeobject_button", "Button", base.DEC, vs_button)
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local f_id = ProtoField.uint16("minetest.client.click_activeobject_id", "ID", base.DEC)
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local f_item = ProtoField.uint16("minetest.client.click_activeobject_item", "Item", base.DEC)
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minetest_client_commands[0x34] = {
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"CLICK_ACTIVEOBJECT", 7,
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{ f_button, f_id, f_item },
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function(buffer, pinfo, tree, t)
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t:add(f_button, buffer(2,1))
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t:add(f_id, buffer(3,2))
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t:add(f_item, buffer(5,2))
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end
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}
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end
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-- TOSERVER_DAMAGE
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do
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local f_amount = ProtoField.uint8("minetest.client.damage_amount", "Amount", base.DEC)
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minetest_client_commands[0x35] = {
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"DAMAGE", 3,
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{ f_amount },
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function(buffer, pinfo, tree, t)
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t:add(f_amount, buffer(2,1))
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end
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}
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end
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-- TOSERVER_PASSWORD
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do
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local f_old_password = ProtoField.string("minetest.client.password_old", "Old password")
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local f_new_password = ProtoField.string("minetest.client.password_new", "New password")
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minetest_client_commands[0x36] = {
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"PASSWORD", 58,
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{ f_old_password, f_new_password },
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function(buffer, pinfo, tree, t)
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t:add(f_old_password, buffer(2,28))
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t:add(f_new_password, buffer(30,28))
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end
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}
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end
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-- TOSERVER_PLAYERITEM
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do
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local f_item = ProtoField.uint16("minetest.client.playeritem_item", "Wielded item")
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minetest_client_commands[0x37] = {
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"PLAYERITEM", 4,
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|
{ f_item },
|
|
function(buffer, pinfo, tree, t)
|
|
t:add(f_item, buffer(2,2))
|
|
end
|
|
}
|
|
end
|
|
|
|
|
|
|
|
|
|
--------------------------------------------
|
|
-- Part 2 --
|
|
-- Server command dissectors (TOCLIENT_*) --
|
|
--------------------------------------------
|
|
|
|
minetest_server_commands = {}
|
|
minetest_server_obsolete = {}
|
|
|
|
-- TOCLIENT_INIT
|
|
|
|
do
|
|
local f_version = ProtoField.uint8("minetest.server.init_version", "Deployed version", base.DEC)
|
|
local f_pos_x = ProtoField.int16("minetest.server.init_pos_x", "Position X", base.DEC)
|
|
local f_pos_y = ProtoField.int16("minetest.server.init_pos_y", "Position Y", base.DEC)
|
|
local f_pos_z = ProtoField.int16("minetest.server.init_pos_x", "Position Z", base.DEC)
|
|
local f_map_seed = ProtoField.uint64("minetest.server.init_map_seed", "Map seed", base.DEC)
|
|
|
|
minetest_server_commands[0x10] = {
|
|
"INIT", 17,
|
|
{ f_version, f_pos_x, f_pos_y, f_pos_z, f_map_seed },
|
|
function(buffer, pinfo, tree, t)
|
|
t:add(f_version, buffer(2,1))
|
|
t:add(f_pos_x, buffer(3,2))
|
|
t:add(f_pos_y, buffer(5,2))
|
|
t:add(f_pos_z, buffer(7,2))
|
|
t:add(f_map_seed, buffer(9,8))
|
|
end
|
|
}
|
|
end
|
|
|
|
-- TOCLIENT_BLOCKDATA
|
|
|
|
do
|
|
local f_x = ProtoField.int16("minetest.server.blockdata_x", "Block position X", base.DEC)
|
|
local f_y = ProtoField.int16("minetest.server.blockdata_y", "Block position Y", base.DEC)
|
|
local f_z = ProtoField.int16("minetest.server.blockdata_z", "Block position Z", base.DEC)
|
|
local f_data = ProtoField.bytes("minetest.server.blockdata_block", "Serialized MapBlock")
|
|
|
|
minetest_server_commands[0x20] = {
|
|
"BLOCKDATA", 8,
|
|
{ f_x, f_y, f_z, f_data },
|
|
function(buffer, pinfo, tree, t)
|
|
t:add(f_x, buffer(2,2))
|
|
t:add(f_y, buffer(4,2))
|
|
t:add(f_z, buffer(6,2))
|
|
t:add(f_data, buffer(8, buffer:len() - 8))
|
|
end
|
|
}
|
|
end
|
|
|
|
-- TOCLIENT_ADDNODE
|
|
|
|
do
|
|
local f_x = ProtoField.int16("minetest.server.addnode_x", "Position X", base.DEC)
|
|
local f_y = ProtoField.int16("minetest.server.addnode_y", "Position Y", base.DEC)
|
|
local f_z = ProtoField.int16("minetest.server.addnode_z", "Position Z", base.DEC)
|
|
local f_data = ProtoField.bytes("minetest.server.addnode_node", "Serialized MapNode")
|
|
|
|
minetest_server_commands[0x21] = {
|
|
"ADDNODE", 8,
|
|
{ f_x, f_y, f_z, f_data },
|
|
function(buffer, pinfo, tree, t)
|
|
t:add(f_x, buffer(2,2))
|
|
t:add(f_y, buffer(4,2))
|
|
t:add(f_z, buffer(6,2))
|
|
t:add(f_data, buffer(8, buffer:len() - 8))
|
|
end
|
|
}
|
|
end
|
|
|
|
-- TOCLIENT_REMOVENODE
|
|
|
|
do
|
|
local f_x = ProtoField.int16("minetest.server.removenode_x", "Position X", base.DEC)
|
|
local f_y = ProtoField.int16("minetest.server.removenode_y", "Position Y", base.DEC)
|
|
local f_z = ProtoField.int16("minetest.server.removenode_z", "Position Z", base.DEC)
|
|
|
|
minetest_server_commands[0x22] = {
|
|
"REMOVENODE", 8,
|
|
{ f_x, f_y, f_z },
|
|
function(buffer, pinfo, tree, t)
|
|
t:add(f_x, buffer(2,2))
|
|
t:add(f_y, buffer(4,2))
|
|
t:add(f_z, buffer(6,2))
|
|
end
|
|
}
|
|
end
|
|
|
|
-- TOCLIENT_PLAYERPOS (obsolete)
|
|
|
|
minetest_server_commands[0x23] = { "PLAYERPOS", 2 }
|
|
minetest_server_obsolete[0x23] = true
|
|
|
|
-- TOCLIENT_PLAYERINFO
|
|
|
|
do
|
|
local f_count = ProtoField.uint16("minetest.server.playerinfo_count", "Count", base.DEC)
|
|
local f_player = ProtoField.bytes("minetest.server.playerinfo_player", "Player", base.DEC)
|
|
local f_peer_id = ProtoField.uint16("minetest.server.playerinfo_peer_id", "Peer ID", base.DEC)
|
|
local f_name = ProtoField.string("minetest.server.playerinfo_name", "Name")
|
|
|
|
minetest_server_commands[0x24] = {
|
|
"PLAYERINFO", 2,
|
|
{ f_count, f_player, f_peer_id, f_name },
|
|
function(buffer, pinfo, tree, t)
|
|
local count = 0
|
|
local pos, index
|
|
for pos = 2, buffer:len() - 22, 22 do -- does lua have integer division?
|
|
count = count + 1
|
|
end
|
|
t:add(f_count, count):set_generated()
|
|
t:set_len(2 + 22 * count)
|
|
pinfo.cols.info:append(" * " .. count)
|
|
for index = 0, count - 1 do
|
|
local pos = 2 + 22 * index
|
|
local t2 = t:add(f_player, buffer(pos, 22))
|
|
t2:set_text("Player, ID: " .. buffer(pos, 2):uint()
|
|
.. ", Name: " .. buffer(pos + 2, 20):string())
|
|
t2:add(f_peer_id, buffer(pos, 2))
|
|
t2:add(f_name, buffer(pos + 2, 20))
|
|
end
|
|
end
|
|
}
|
|
end
|
|
|
|
-- TOCLIENT_OPT_BLOCK_NOT_FOUND (obsolete)
|
|
|
|
minetest_server_commands[0x25] = { "OPT_BLOCK_NOT_FOUND", 2 }
|
|
minetest_server_obsolete[0x25] = true
|
|
|
|
-- TOCLIENT_SECTORMETA (obsolete)
|
|
|
|
minetest_server_commands[0x26] = { "SECTORMETA", 2 }
|
|
minetest_server_obsolete[0x26] = true
|
|
|
|
-- TOCLIENT_INVENTORY
|
|
|
|
do
|
|
local f_inventory = ProtoField.string("minetest.server.inventory", "Inventory")
|
|
|
|
minetest_server_commands[0x27] = {
|
|
"INVENTORY", 2,
|
|
{ f_inventory },
|
|
function(buffer, pinfo, tree, t)
|
|
t:add(f_inventory, buffer(2, buffer:len() - 2))
|
|
end
|
|
}
|
|
end
|
|
|
|
-- TOCLIENT_OBJECTDATA
|
|
|
|
do
|
|
local f_player_count = ProtoField.uint16("minetest.server.objectdata_player_count",
|
|
"Count of player positions", base.DEC)
|
|
local f_player = ProtoField.bytes("minetest.server.objectdata_player", "Player position")
|
|
local f_peer_id = ProtoField.uint16("minetest.server.objectdata_player_peer_id", "Peer ID")
|
|
local f_x = ProtoField.int32("minetest.server.objectdata_player_x", "Position X", base.DEC)
|
|
local f_y = ProtoField.int32("minetest.server.objectdata_player_y", "Position Y", base.DEC)
|
|
local f_z = ProtoField.int32("minetest.server.objectdata_player_z", "Position Z", base.DEC)
|
|
local f_speed_x = ProtoField.int32("minetest.server.objectdata_player_speed_x", "Speed X", base.DEC)
|
|
local f_speed_y = ProtoField.int32("minetest.server.objectdata_player_speed_y", "Speed Y", base.DEC)
|
|
local f_speed_z = ProtoField.int32("minetest.server.objectdata_player_speed_z", "Speed Z", base.DEC)
|
|
local f_pitch = ProtoField.int32("minetest.server.objectdata_player_pitch", "Pitch", base.DEC)
|
|
local f_yaw = ProtoField.int32("minetest.server.objectdata_player_yaw", "Yaw", base.DEC)
|
|
local f_block_count = ProtoField.uint16("minetest.server.objectdata_block_count",
|
|
"Count of blocks", base.DEC)
|
|
|
|
minetest_server_commands[0x28] = {
|
|
"OBJECTDATA", 6,
|
|
{ f_player_count, f_player, f_peer_id, f_x, f_y, f_z,
|
|
f_speed_x, f_speed_y, f_speed_z,f_pitch, f_yaw,
|
|
f_block_count },
|
|
function(buffer, pinfo, tree, t)
|
|
local t2, index, pos
|
|
|
|
local player_count_pos = 2
|
|
local player_count = buffer(player_count_pos, 2):uint()
|
|
t:add(f_player_count, buffer(player_count_pos, 2))
|
|
|
|
local block_count_pos = player_count_pos + 2 + 34 * player_count
|
|
if not minetest_check_length(buffer, block_count_pos + 2, t) then
|
|
return
|
|
end
|
|
|
|
for index = 0, player_count - 1 do
|
|
pos = player_count_pos + 2 + 34 * index
|
|
t2 = t:add(f_player, buffer(pos, 34))
|
|
t2:set_text("Player position, ID: " .. buffer(pos, 2):uint())
|
|
t2:add(f_peer_id, buffer(pos, 2))
|
|
t2:add(f_x, buffer(pos + 2, 4))
|
|
t2:add(f_y, buffer(pos + 6, 4))
|
|
t2:add(f_z, buffer(pos + 10, 4))
|
|
t2:add(f_speed_x, buffer(pos + 14, 4))
|
|
t2:add(f_speed_y, buffer(pos + 18, 4))
|
|
t2:add(f_speed_z, buffer(pos + 22, 4))
|
|
t2:add(f_pitch, buffer(pos + 26, 4))
|
|
t2:add(f_yaw, buffer(pos + 30, 4))
|
|
end
|
|
|
|
local block_count = buffer(block_count_pos, 2):uint()
|
|
t:add(f_block_count, buffer(block_count_pos, 2))
|
|
|
|
-- TODO: dissect blocks.
|
|
-- NOTE: block_count > 0 is obsolete. (?)
|
|
|
|
pinfo.cols.info:append(" * " .. (player_count + block_count))
|
|
end
|
|
}
|
|
end
|
|
|
|
-- TOCLIENT_TIME_OF_DAY
|
|
|
|
do
|
|
local f_time = ProtoField.uint16("minetest.server.time_of_day", "Time", base.DEC)
|
|
|
|
minetest_server_commands[0x29] = {
|
|
"TIME_OF_DAY", 4,
|
|
{ f_time },
|
|
function(buffer, pinfo, tree, t)
|
|
t:add(f_time, buffer(2,2))
|
|
end
|
|
}
|
|
end
|
|
|
|
-- TOCLIENT_CHAT_MESSAGE
|
|
|
|
do
|
|
local f_length = ProtoField.uint16("minetest.server.chat_message_length", "Length", base.DEC)
|
|
local f_message = ProtoField.string("minetest.server.chat_message", "Message")
|
|
|
|
minetest_server_commands[0x30] = {
|
|
"CHAT_MESSAGE", 4,
|
|
{ f_length, f_message },
|
|
function(buffer, pinfo, tree, t)
|
|
t:add(f_length, buffer(2,2))
|
|
local textlen = buffer(2,2):uint()
|
|
if minetest_check_length(buffer, 4 + textlen*2, t) then
|
|
t:add(f_message, minetest_convert_utf16(buffer(4, textlen*2), "Converted chat message"))
|
|
end
|
|
end
|
|
}
|
|
end
|
|
|
|
-- TOCLIENT_ACTIVE_OBJECT_REMOVE_ADD
|
|
|
|
do
|
|
local f_removed_count = ProtoField.uint16(
|
|
"minetest.server.active_object_remove_add_removed_count",
|
|
"Count of removed objects", base.DEC)
|
|
local f_removed = ProtoField.bytes(
|
|
"minetest.server.active_object_remove_add_removed",
|
|
"Removed object")
|
|
local f_removed_id = ProtoField.uint16(
|
|
"minetest.server.active_object_remove_add_removed_id",
|
|
"ID", base.DEC)
|
|
|
|
local f_added_count = ProtoField.uint16(
|
|
"minetest.server.active_object_remove_add_added_count",
|
|
"Count of added objects", base.DEC)
|
|
local f_added = ProtoField.bytes(
|
|
"minetest.server.active_object_remove_add_added",
|
|
"Added object")
|
|
local f_added_id = ProtoField.uint16(
|
|
"minetest.server.active_object_remove_add_added_id",
|
|
"ID", base.DEC)
|
|
local f_added_type = ProtoField.uint8(
|
|
"minetest.server.active_object_remove_add_added_type",
|
|
"Type", base.DEC)
|
|
local f_added_init_length = ProtoField.uint32(
|
|
"minetest.server.active_object_remove_add_added_init_length",
|
|
"Initialization data length", base.DEC)
|
|
local f_added_init_data = ProtoField.bytes(
|
|
"minetest.server.active_object_remove_add_added_init_data",
|
|
"Initialization data")
|
|
|
|
minetest_server_commands[0x31] = {
|
|
"ACTIVE_OBJECT_REMOVE_ADD", 6,
|
|
{ f_removed_count, f_removed, f_removed_id,
|
|
f_added_count, f_added, f_added_id,
|
|
f_added_type, f_added_init_length, f_added_init_data },
|
|
function(buffer, pinfo, tree, t)
|
|
local t2, index, pos
|
|
|
|
local removed_count_pos = 2
|
|
local removed_count = buffer(removed_count_pos, 2):uint()
|
|
t:add(f_removed_count, buffer(removed_count_pos, 2))
|
|
|
|
local added_count_pos = removed_count_pos + 2 + 2 * removed_count
|
|
if not minetest_check_length(buffer, added_count_pos + 2, t) then
|
|
return
|
|
end
|
|
|
|
-- Loop through removed active objects
|
|
for index = 0, removed_count - 1 do
|
|
pos = removed_count_pos + 2 + 2 * index
|
|
t2 = t:add(f_removed, buffer(pos, 2))
|
|
t2:set_text("Removed object, ID = " .. buffer(pos, 2):uint())
|
|
t2:add(f_removed_id, buffer(pos, 2))
|
|
end
|
|
|
|
local added_count = buffer(added_count_pos, 2):uint()
|
|
t:add(f_added_count, buffer(added_count_pos, 2))
|
|
|
|
-- Loop through added active objects
|
|
pos = added_count_pos + 2
|
|
for index = 0, added_count - 1 do
|
|
if not minetest_check_length(buffer, pos + 7, t) then
|
|
return
|
|
end
|
|
|
|
local init_length = buffer(pos + 3, 4):uint()
|
|
if not minetest_check_length(buffer, pos + 7 + init_length, t) then
|
|
return
|
|
end
|
|
|
|
t2 = t:add(f_added, buffer(pos, 7 + init_length))
|
|
t2:set_text("Added object, ID = " .. buffer(pos, 2):uint())
|
|
t2:add(f_added_id, buffer(pos, 2))
|
|
t2:add(f_added_type, buffer(pos + 2, 1))
|
|
t2:add(f_added_init_length, buffer(pos + 3, 4))
|
|
t2:add(f_added_init_data, buffer(pos + 7, init_length))
|
|
|
|
pos = pos + 7 + init_length
|
|
end
|
|
|
|
pinfo.cols.info:append(" * " .. (removed_count + added_count))
|
|
end
|
|
}
|
|
end
|
|
|
|
-- TOCLIENT_ACTIVE_OBJECT_MESSAGES
|
|
|
|
do
|
|
local f_object_count = ProtoField.uint16(
|
|
"minetest.server.active_object_messages_object_count",
|
|
"Count of objects", base.DEC)
|
|
local f_object = ProtoField.bytes(
|
|
"minetest.server.active_object_messages_object",
|
|
"Object")
|
|
local f_object_id = ProtoField.uint16(
|
|
"minetest.server.active_object_messages_id",
|
|
"ID", base.DEC)
|
|
local f_message_length = ProtoField.uint16(
|
|
"minetest.server.active_object_messages_message_length",
|
|
"Message length", base.DEC)
|
|
local f_message = ProtoField.bytes(
|
|
"minetest.server.active_object_messages_message",
|
|
"Message")
|
|
|
|
minetest_server_commands[0x32] = {
|
|
"ACTIVE_OBJECT_MESSAGES", 2,
|
|
{ f_object_count, f_object, f_object_id, f_message_length, f_message },
|
|
function(buffer, pinfo, tree, t)
|
|
local t2, count, pos, message_length
|
|
|
|
count = 0
|
|
pos = 2
|
|
while pos < buffer:len() do
|
|
if not minetest_check_length(buffer, pos + 4, t) then
|
|
return
|
|
end
|
|
message_length = buffer(pos + 2, 2):uint()
|
|
if not minetest_check_length(buffer, pos + 4 + message_length, t) then
|
|
return
|
|
end
|
|
count = count + 1
|
|
pos = pos + 4 + message_length
|
|
end
|
|
|
|
pinfo.cols.info:append(" * " .. count)
|
|
t:add(f_object_count, count):set_generated()
|
|
|
|
pos = 2
|
|
while pos < buffer:len() do
|
|
message_length = buffer(pos + 2, 2):uint()
|
|
|
|
t2 = t:add(f_object, buffer(pos, 4 + message_length))
|
|
t2:set_text("Object, ID = " .. buffer(pos, 2):uint())
|
|
t2:add(f_object_id, buffer(pos, 2))
|
|
t2:add(f_message_length, buffer(pos + 2, 2))
|
|
t2:add(f_message, buffer(pos + 4, message_length))
|
|
|
|
pos = pos + 4 + message_length
|
|
end
|
|
end
|
|
}
|
|
end
|
|
|
|
-- TOCLIENT_HP
|
|
|
|
do
|
|
local f_hp = ProtoField.uint8("minetest.server.hp", "Hitpoints", base.DEC)
|
|
|
|
minetest_server_commands[0x33] = {
|
|
"HP", 3,
|
|
{ f_hp },
|
|
function(buffer, pinfo, tree, t)
|
|
t:add(f_hp, buffer(2,1))
|
|
end
|
|
}
|
|
end
|
|
|
|
-- TOCLIENT_MOVE_PLAYER
|
|
|
|
do
|
|
local f_x = ProtoField.int32("minetest.server.move_player_x", "Position X", base.DEC)
|
|
local f_y = ProtoField.int32("minetest.server.move_player_y", "Position Y", base.DEC)
|
|
local f_z = ProtoField.int32("minetest.server.move_player_z", "Position Z", base.DEC)
|
|
local f_pitch = ProtoField.int32("minetest.server.move_player_pitch", "Pitch", base.DEC)
|
|
local f_yaw = ProtoField.int32("minetest.server.move_player_yaw", "Yaw", base.DEC)
|
|
local f_garbage = ProtoField.bytes("minetest.server.move_player_garbage", "Garbage")
|
|
|
|
minetest_server_commands[0x34] = {
|
|
"MOVE_PLAYER", 18, -- actually 22, but see below
|
|
{ f_x, f_y, f_z, f_pitch, f_yaw, f_garbage },
|
|
function(buffer, pinfo, tree, t)
|
|
t:add(f_x, buffer(2, 4))
|
|
t:add(f_y, buffer(6, 4))
|
|
t:add(f_z, buffer(10, 4))
|
|
|
|
-- Compatibility note:
|
|
-- Up to 2011-08-23, there was a bug in Minetest that
|
|
-- caused the server to serialize the pitch and yaw
|
|
-- with 2 bytes each instead of 4, creating a
|
|
-- malformed message.
|
|
if buffer:len() >= 22 then
|
|
t:add(f_pitch, buffer(14, 4))
|
|
t:add(f_yaw, buffer(18, 4))
|
|
else
|
|
t:add(f_garbage, buffer(14, 4))
|
|
t:add_expert_info(PI_MALFORMED, PI_WARN, "Malformed pitch and yaw, possibly caused by a serialization bug in Minetest")
|
|
end
|
|
end
|
|
}
|
|
end
|
|
|
|
-- TOCLIENT_ACCESS_DENIED
|
|
|
|
do
|
|
local f_reason_length = ProtoField.uint16("minetest.server.access_denied_reason_length", "Reason length", base.DEC)
|
|
local f_reason = ProtoField.string("minetest.server.access_denied_reason", "Reason")
|
|
|
|
minetest_server_commands[0x35] = {
|
|
"ACCESS_DENIED", 4,
|
|
{ f_reason_length, f_reason },
|
|
function(buffer, pinfo, tree, t)
|
|
t:add(f_reason_length, buffer(2,2))
|
|
local reason_length = buffer(2,2):uint()
|
|
if minetest_check_length(buffer, 4 + reason_length * 2, t) then
|
|
t:add(f_reason, minetest_convert_utf16(buffer(4, reason_length * 2), "Converted reason message"))
|
|
end
|
|
end
|
|
}
|
|
end
|
|
|
|
-- TOCLIENT_PLAYERITEM
|
|
|
|
do
|
|
local f_count = ProtoField.uint16(
|
|
"minetest.server.playeritem_count",
|
|
"Count of players", base.DEC)
|
|
local f_player = ProtoField.bytes(
|
|
"minetest.server.playeritem_player",
|
|
"Player")
|
|
local f_peer_id = ProtoField.uint16(
|
|
"minetest.server.playeritem_peer_id",
|
|
"Peer ID", base.DEC)
|
|
local f_item_length = ProtoField.uint16(
|
|
"minetest.server.playeritem_item_length",
|
|
"Item information length", base.DEC)
|
|
local f_item = ProtoField.string(
|
|
"minetest.server.playeritem_item",
|
|
"Item information")
|
|
|
|
minetest_server_commands[0x36] = {
|
|
"PLAYERITEM", 4,
|
|
{ f_count, f_player, f_peer_id, f_item_length, f_item },
|
|
function(buffer, pinfo, tree, t)
|
|
local count, index, pos, item_length
|
|
|
|
count = buffer(2,2):uint()
|
|
pinfo.cols.info:append(" * " .. count)
|
|
t:add(f_count, buffer(2,2))
|
|
|
|
pos = 4
|
|
for index = 0, count - 1 do
|
|
if not minetest_check_length(buffer, pos + 4, t) then
|
|
return
|
|
end
|
|
item_length = buffer(pos + 2, 2):uint()
|
|
if not minetest_check_length(buffer, pos + 4 + item_length, t) then
|
|
return
|
|
end
|
|
|
|
local t2 = t:add(f_player, buffer(pos, 4 + item_length))
|
|
t2:set_text("Player, ID: " .. buffer(pos, 2):uint())
|
|
t2:add(f_peer_id, buffer(pos, 2))
|
|
t2:add(f_item_length, buffer(pos + 2, 2))
|
|
t2:add(f_item, buffer(pos + 4, item_length))
|
|
|
|
pos = pos + 4 + item_length
|
|
end
|
|
end
|
|
}
|
|
end
|
|
|
|
|
|
|
|
|
|
------------------------------------
|
|
-- Part 3 --
|
|
-- Wrapper protocol subdissectors --
|
|
------------------------------------
|
|
|
|
-- minetest.control dissector
|
|
|
|
do
|
|
local p_control = Proto("minetest.control", "Minetest Control")
|
|
|
|
local vs_control_type = {
|
|
[0] = "Ack",
|
|
[1] = "Set Peer ID",
|
|
[2] = "Ping",
|
|
[3] = "Disco"
|
|
}
|
|
|
|
local f_control_type = ProtoField.uint8("minetest.control.type", "Control Type", base.DEC, vs_control_type)
|
|
local f_control_ack = ProtoField.uint16("minetest.control.ack", "ACK sequence number", base.DEC)
|
|
local f_control_peerid = ProtoField.uint8("minetest.control.peerid", "New peer ID", base.DEC)
|
|
p_control.fields = { f_control_type, f_control_ack, f_control_peerid }
|
|
|
|
local data_dissector = Dissector.get("data")
|
|
|
|
function p_control.dissector(buffer, pinfo, tree)
|
|
local t = tree:add(p_control, buffer(0,1))
|
|
t:add(f_control_type, buffer(0,1))
|
|
|
|
pinfo.cols.info = "Control message"
|
|
|
|
local pos = 1
|
|
if buffer(0,1):uint() == 0 then
|
|
pos = 3
|
|
t:set_len(3)
|
|
t:add(f_control_ack, buffer(1,2))
|
|
pinfo.cols.info = "Ack " .. buffer(1,2):uint()
|
|
elseif buffer(0,1):uint() == 1 then
|
|
pos = 3
|
|
t:set_len(3)
|
|
t:add(f_control_peerid, buffer(1,2))
|
|
pinfo.cols.info = "Set peer ID " .. buffer(1,2):uint()
|
|
elseif buffer(0,1):uint() == 2 then
|
|
pinfo.cols.info = "Ping"
|
|
elseif buffer(0,1):uint() == 3 then
|
|
pinfo.cols.info = "Disco"
|
|
end
|
|
|
|
data_dissector:call(buffer(pos):tvb(), pinfo, tree)
|
|
end
|
|
end
|
|
|
|
-- minetest.client dissector
|
|
-- minetest.server dissector
|
|
|
|
-- Defines the minetest.client or minetest.server Proto. These two protocols
|
|
-- are created by the same function because they are so similar.
|
|
-- Parameter: proto: the Proto object
|
|
-- Parameter: this_peer: "Client" or "Server"
|
|
-- Parameter: other_peer: "Server" or "Client"
|
|
-- Parameter: commands: table of command information, built above
|
|
-- Parameter: obsolete: table of obsolete commands, built above
|
|
function minetest_define_client_or_server_proto(is_client)
|
|
-- Differences between minetest.client and minetest.server
|
|
local proto_name, this_peer, other_peer, empty_message_info
|
|
local commands, obsolete
|
|
if is_client then
|
|
proto_name = "minetest.client"
|
|
this_peer = "Client"
|
|
other_peer = "Server"
|
|
empty_message_info = "Empty message / Connect"
|
|
commands = minetest_client_commands -- defined in Part 1
|
|
obsolete = minetest_client_obsolete -- defined in Part 1
|
|
else
|
|
proto_name = "minetest.server"
|
|
this_peer = "Server"
|
|
other_peer = "Client"
|
|
empty_message_info = "Empty message"
|
|
commands = minetest_server_commands -- defined in Part 2
|
|
obsolete = minetest_server_obsolete -- defined in Part 2
|
|
end
|
|
|
|
-- Create the protocol object.
|
|
local proto = Proto(proto_name, "Minetest " .. this_peer .. " to " .. other_peer)
|
|
|
|
-- Create a table vs_command that maps command codes to command names.
|
|
local vs_command = {}
|
|
local code, command_info
|
|
for code, command_info in pairs(commands) do
|
|
local command_name = command_info[1]
|
|
vs_command[code] = "TO" .. other_peer:upper() .. "_" .. command_name
|
|
end
|
|
|
|
-- Field definitions
|
|
local f_command = ProtoField.uint16(proto_name .. ".command", "Command", base.HEX, vs_command)
|
|
local f_empty = ProtoField.bool(proto_name .. ".empty", "Is empty", BASE_NONE)
|
|
proto.fields = { f_command, f_empty }
|
|
|
|
-- Add command-specific fields to the protocol
|
|
for code, command_info in pairs(commands) do
|
|
local command_fields = command_info[3]
|
|
if command_fields ~= nil then
|
|
local index, field
|
|
for index, field in ipairs(command_fields) do
|
|
table.insert(proto.fields, field)
|
|
end
|
|
end
|
|
end
|
|
|
|
-- minetest.client or minetest.server dissector function
|
|
function proto.dissector(buffer, pinfo, tree)
|
|
local t = tree:add(proto, buffer)
|
|
|
|
pinfo.cols.info = this_peer
|
|
|
|
if buffer:len() == 0 then
|
|
-- Empty message.
|
|
t:add(f_empty, 1):set_generated()
|
|
pinfo.cols.info:append(": " .. empty_message_info)
|
|
|
|
elseif minetest_check_length(buffer, 2, t) then
|
|
-- Get the command code.
|
|
t:add(f_command, buffer(0,2))
|
|
local code = buffer(0,2):uint()
|
|
local command_info = commands[code]
|
|
if command_info == nil then
|
|
-- Error: Unknown command.
|
|
pinfo.cols.info:append(": Unknown command")
|
|
t:add_expert_info(PI_UNDECODED, PI_WARN, "Unknown " .. this_peer .. " to " .. other_peer .. " command")
|
|
else
|
|
-- Process a known command
|
|
local command_name = command_info[1]
|
|
local command_min_length = command_info[2]
|
|
local command_fields = command_info[3]
|
|
local command_dissector = command_info[4]
|
|
if minetest_check_length(buffer, command_min_length, t) then
|
|
pinfo.cols.info:append(": " .. command_name)
|
|
if command_dissector ~= nil then
|
|
command_dissector(buffer, pinfo, tree, t)
|
|
end
|
|
end
|
|
if obsolete[code] then
|
|
t:add_expert_info(PI_REQUEST_CODE, PI_WARN, "Obsolete command.")
|
|
end
|
|
end
|
|
end
|
|
end
|
|
end
|
|
|
|
minetest_define_client_or_server_proto(true) -- minetest.client
|
|
minetest_define_client_or_server_proto(false) -- minetest.server
|
|
|
|
-- minetest.split dissector
|
|
|
|
do
|
|
local p_split = Proto("minetest.split", "Minetest Split Message")
|
|
|
|
local f_split_seq = ProtoField.uint16("minetest.split.seq", "Sequence number", base.DEC)
|
|
local f_split_chunkcount = ProtoField.uint16("minetest.split.chunkcount", "Chunk count", base.DEC)
|
|
local f_split_chunknum = ProtoField.uint16("minetest.split.chunknum", "Chunk number", base.DEC)
|
|
local f_split_data = ProtoField.bytes("minetest.split.data", "Split message data")
|
|
p_split.fields = { f_split_seq, f_split_chunkcount, f_split_chunknum, f_split_data }
|
|
|
|
function p_split.dissector(buffer, pinfo, tree)
|
|
local t = tree:add(p_split, buffer(0,6))
|
|
t:add(f_split_seq, buffer(0,2))
|
|
t:add(f_split_chunkcount, buffer(2,2))
|
|
t:add(f_split_chunknum, buffer(4,2))
|
|
t:add(f_split_data, buffer(6))
|
|
pinfo.cols.info:append(" " .. buffer(0,2):uint() .. " chunk " .. buffer(4,2):uint() .. "/" .. buffer(2,2):uint())
|
|
end
|
|
end
|
|
|
|
|
|
|
|
|
|
-------------------------------------
|
|
-- Part 4 --
|
|
-- Wrapper protocol main dissector --
|
|
-------------------------------------
|
|
|
|
-- minetest dissector
|
|
|
|
do
|
|
local p_minetest = Proto("minetest", "Minetest")
|
|
|
|
local minetest_id = 0x4f457403
|
|
local vs_id = {
|
|
[minetest_id] = "Valid"
|
|
}
|
|
|
|
local vs_peer = {
|
|
[0] = "Inexistent",
|
|
[1] = "Server"
|
|
}
|
|
|
|
local vs_type = {
|
|
[0] = "Control",
|
|
[1] = "Original",
|
|
[2] = "Split",
|
|
[3] = "Reliable"
|
|
}
|
|
|
|
local f_id = ProtoField.uint32("minetest.id", "ID", base.HEX, vs_id)
|
|
local f_peer = ProtoField.uint16("minetest.peer", "Peer", base.DEC, vs_peer)
|
|
local f_channel = ProtoField.uint8("minetest.channel", "Channel", base.DEC)
|
|
local f_type = ProtoField.uint8("minetest.type", "Type", base.DEC, vs_type)
|
|
local f_seq = ProtoField.uint16("minetest.seq", "Sequence number", base.DEC)
|
|
local f_subtype = ProtoField.uint8("minetest.subtype", "Subtype", base.DEC, vs_type)
|
|
|
|
p_minetest.fields = { f_id, f_peer, f_channel, f_type, f_seq, f_subtype }
|
|
|
|
local data_dissector = Dissector.get("data")
|
|
local control_dissector = Dissector.get("minetest.control")
|
|
local client_dissector = Dissector.get("minetest.client")
|
|
local server_dissector = Dissector.get("minetest.server")
|
|
local split_dissector = Dissector.get("minetest.split")
|
|
|
|
function p_minetest.dissector(buffer, pinfo, tree)
|
|
|
|
-- Add Minetest tree item and verify the ID
|
|
local t = tree:add(p_minetest, buffer(0,8))
|
|
t:add(f_id, buffer(0,4))
|
|
if buffer(0,4):uint() ~= minetest_id then
|
|
t:add_expert_info(PI_UNDECODED, PI_WARN, "Invalid ID, this is not a Minetest packet")
|
|
return
|
|
end
|
|
|
|
-- ID is valid, so replace packet's shown protocol
|
|
pinfo.cols.protocol = "Minetest"
|
|
pinfo.cols.info = "Minetest"
|
|
|
|
-- Set the other header fields
|
|
t:add(f_peer, buffer(4,2))
|
|
t:add(f_channel, buffer(6,1))
|
|
t:add(f_type, buffer(7,1))
|
|
t:set_text("Minetest, Peer: " .. buffer(4,2):uint() .. ", Channel: " .. buffer(6,1):uint())
|
|
|
|
local reliability_info
|
|
if buffer(7,1):uint() == 3 then
|
|
-- Reliable message
|
|
reliability_info = "Seq=" .. buffer(8,2):uint()
|
|
t:set_len(11)
|
|
t:add(f_seq, buffer(8,2))
|
|
t:add(f_subtype, buffer(10,1))
|
|
pos = 10
|
|
else
|
|
-- Unreliable message
|
|
reliability_info = "Unrel"
|
|
pos = 7
|
|
end
|
|
|
|
if buffer(pos,1):uint() == 0 then
|
|
-- Control message, possibly reliable
|
|
control_dissector:call(buffer(pos+1):tvb(), pinfo, tree)
|
|
elseif buffer(pos,1):uint() == 1 then
|
|
-- Original message, possibly reliable
|
|
if buffer(4,2):uint() == 1 then
|
|
server_dissector:call(buffer(pos+1):tvb(), pinfo, tree)
|
|
else
|
|
client_dissector:call(buffer(pos+1):tvb(), pinfo, tree)
|
|
end
|
|
elseif buffer(pos,1):uint() == 2 then
|
|
-- Split message, possibly reliable
|
|
if buffer(4,2):uint() == 1 then
|
|
pinfo.cols.info = "Server: Split message"
|
|
else
|
|
pinfo.cols.info = "Client: Split message"
|
|
end
|
|
split_dissector:call(buffer(pos+1):tvb(), pinfo, tree)
|
|
elseif buffer(pos,1):uint() == 3 then
|
|
-- Doubly reliable message??
|
|
t:add_expert_info(PI_MALFORMED, PI_ERROR, "Reliable message wrapped in reliable message")
|
|
else
|
|
data_dissector:call(buffer(pos+1):tvb(), pinfo, tree)
|
|
end
|
|
|
|
pinfo.cols.info:append(" (" .. reliability_info .. ")")
|
|
|
|
end
|
|
|
|
-- FIXME Is there a way to let the dissector table check if the first payload bytes are 0x4f457403?
|
|
DissectorTable.get("udp.port"):add(30000, p_minetest)
|
|
DissectorTable.get("udp.port"):add(30001, p_minetest)
|
|
end
|
|
|
|
|
|
|
|
|
|
-----------------------
|
|
-- Part 5 --
|
|
-- Utility functions --
|
|
-----------------------
|
|
|
|
-- Checks if a (sub-)Tvb is long enough to be further dissected.
|
|
-- If it is long enough, sets the dissector tree item length to min_len
|
|
-- and returns true. If it is not long enough, adds expert info to the
|
|
-- dissector tree and returns false.
|
|
-- Parameter: tvb: the Tvb
|
|
-- Parameter: min_len: required minimum length
|
|
-- Parameter: t: dissector tree item
|
|
-- Returns: true if tvb:len() >= min_len, false otherwise
|
|
function minetest_check_length(tvb, min_len, t)
|
|
if tvb:len() >= min_len then
|
|
t:set_len(min_len)
|
|
return true
|
|
|
|
-- Tvb:reported_length_remaining() has been added in August 2011
|
|
-- and is not yet widely available, disable for the time being
|
|
-- TODO: uncomment at a later date
|
|
-- TODO: when uncommenting this, also re-check if other parts of
|
|
-- the dissector could benefit from reported_length_remaining
|
|
--elseif tvb:reported_length_remaining() >= min_len then
|
|
-- t:add_expert_info(PI_UNDECODED, PI_INFO, "Only part of this packet was captured, unable to decode.")
|
|
-- return false
|
|
|
|
else
|
|
t:add_expert_info(PI_MALFORMED, PI_ERROR, "Message is too short")
|
|
return false
|
|
end
|
|
end
|
|
|
|
-- Takes a Tvb or TvbRange (i.e. part of a packet) that
|
|
-- contains a UTF-16 string and returns a TvbRange containing
|
|
-- string converted to ASCII. Any characters outside the range
|
|
-- 0x20 to 0x7e are replaced by a question mark.
|
|
-- Parameter: tvb: Tvb or TvbRange that contains the UTF-16 data
|
|
-- Parameter: name: will be the name of the newly created Tvb.
|
|
-- Returns: New TvbRange containing the ASCII string.
|
|
-- TODO: Handle surrogates (should only produce one question mark)
|
|
-- TODO: Remove this when Wireshark supports UTF-16 strings natively.
|
|
function minetest_convert_utf16(tvb, name)
|
|
local hex, pos, char
|
|
hex = ""
|
|
for pos = 0, tvb:len() - 2, 2 do
|
|
char = tvb(pos, 2):uint()
|
|
if (char >= 0x20) and (char <= 0x7e) then
|
|
hex = hex .. string.format(" %02x", char)
|
|
else
|
|
hex = hex .. " 3F"
|
|
end
|
|
end
|
|
return ByteArray.new(hex):tvb(name):range()
|
|
end
|
|
|