--- /dev/null
+-- minetest.lua
+-- Packet dissector for the UDP-based Minetest protocol
+-- Copy this to $HOME/.wireshark/plugins/
+
+
+--
+-- Minetest-c55
+-- Copyright (C) 2011 celeron55, Perttu Ahola <celeron55@gmail.com>
+--
+-- This program is free software; you can redistribute it and/or modify
+-- it under the terms of the GNU General Public License as published by
+-- the Free Software Foundation; either version 2 of the License, or
+-- (at your option) any later version.
+--
+-- This program is distributed in the hope that it will be useful,
+-- but WITHOUT ANY WARRANTY; without even the implied warranty of
+-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+-- GNU General Public License for more details.
+--
+-- You should have received a copy of the GNU General Public License along
+-- with this program; if not, write to the Free Software Foundation, Inc.,
+-- 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+--
+
+
+-- Table of Contents:
+-- Part 1: Client command dissectors (TOSERVER_*)
+-- Part 2: Server command dissectors (TOCLIENT_*)
+-- Part 3: Wrapper protocol subdissectors
+-- Part 4: Wrapper protocol main dissector
+-- Part 5: Utility functions
+
+
+
+
+--------------------------------------------
+-- Part 1 --
+-- Client command dissectors (TOSERVER_*) --
+--------------------------------------------
+
+minetest_client_commands = {}
+minetest_client_obsolete = {}
+
+-- TOSERVER_INIT
+
+do
+ local f_ser_fmt = ProtoField.uint8("minetest.client.init_ser_version",
+ "Maximum serialization format version", base.DEC)
+ local f_player_name = ProtoField.stringz("minetest.client.init_player_name", "Player Name")
+ local f_password = ProtoField.stringz("minetest.client.init_password", "Password")
+ local f_version = ProtoField.uint16("minetest.client.init_version", "Version", base.DEC)
+
+ minetest_client_commands[0x10] = {
+ "INIT", -- Command name
+ 53, -- Minimum message length including code
+ { f_ser_fmt, -- List of fields [optional]
+ f_player_name,
+ f_password,
+ f_version },
+ function(buffer, pinfo, tree, t) -- Dissector function [optional]
+ t:add(f_ser_fmt, buffer(2,1))
+ t:add(f_player_name, buffer(3,20))
+ t:add(f_password, buffer(23,28))
+ t:add(f_version, buffer(51,2))
+ end
+ }
+end
+
+-- TOSERVER_INIT2
+
+minetest_client_commands[0x11] = { "INIT2", 2 }
+
+-- TOSERVER_GETBLOCK (obsolete)
+
+minetest_client_commands[0x20] = { "GETBLOCK", 2 }
+minetest_client_obsolete[0x20] = true
+
+-- TOSERVER_ADDNODE (obsolete)
+
+minetest_client_commands[0x21] = { "ADDNODE", 2 }
+minetest_client_obsolete[0x21] = true
+
+-- TOSERVER_REMOVENODE (obsolete)
+
+minetest_client_commands[0x22] = { "REMOVENODE", 2 }
+minetest_client_obsolete[0x22] = true
+
+-- TOSERVER_PLAYERPOS
+
+do
+ local f_x = ProtoField.int32("minetest.client.playerpos_x", "Position X", base.DEC)
+ local f_y = ProtoField.int32("minetest.client.playerpos_y", "Position Y", base.DEC)
+ local f_z = ProtoField.int32("minetest.client.playerpos_z", "Position Z", base.DEC)
+ local f_speed_x = ProtoField.int32("minetest.client.playerpos_speed_x", "Speed X", base.DEC)
+ local f_speed_y = ProtoField.int32("minetest.client.playerpos_speed_y", "Speed Y", base.DEC)
+ local f_speed_z = ProtoField.int32("minetest.client.playerpos_speed_z", "Speed Z", base.DEC)
+ local f_pitch = ProtoField.int32("minetest.client.playerpos_pitch", "Pitch", base.DEC)
+ local f_yaw = ProtoField.int32("minetest.client.playerpos_yaw", "Yaw", base.DEC)
+
+ minetest_client_commands[0x23] = {
+ "PLAYERPOS", 34,
+ { f_x, f_y, f_z, f_speed_x, f_speed_y, f_speed_z, f_pitch, f_yaw },
+ 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))
+ t:add(f_speed_x, buffer(14,4))
+ t:add(f_speed_y, buffer(18,4))
+ t:add(f_speed_z, buffer(22,4))
+ t:add(f_pitch, buffer(26,4))
+ t:add(f_yaw, buffer(30,4))
+ end
+ }
+end
+
+-- TOSERVER_GOTBLOCKS
+
+do
+ local f_count = ProtoField.uint8("minetest.client.gotblocks_count", "Count", base.DEC)
+ local f_block = ProtoField.bytes("minetset.client.gotblocks_block", "Block", base.DEC)
+ local f_x = ProtoField.int16("minetest.client.gotblocks_x", "Block position X", base.DEC)
+ local f_y = ProtoField.int16("minetest.client.gotblocks_y", "Block position Y", base.DEC)
+ local f_z = ProtoField.int16("minetest.client.gotblocks_z", "Block position Z", base.DEC)
+
+ minetest_client_commands[0x24] = {
+ "GOTBLOCKS", 3,
+ { f_count, f_block, f_x, f_y, f_z },
+ function(buffer, pinfo, tree, t)
+ t:add(f_count, buffer(2,1))
+ local count = buffer(2,1):uint()
+ if minetest_check_length(buffer, 3 + 6*count, t) then
+ pinfo.cols.info:append(" * " .. count)
+ local index
+ for index = 0, count - 1 do
+ local pos = 3 + 6*index
+ local t2 = t:add(f_block, buffer(pos, 6))
+ t2:set_text("Block, X: " .. buffer(pos, 2):int()
+ .. ", Y: " .. buffer(pos + 2, 2):int()
+ .. ", Z: " .. buffer(pos + 4, 2):int())
+ t2:add(f_x, buffer(pos, 2))
+ t2:add(f_y, buffer(pos + 2, 2))
+ t2:add(f_z, buffer(pos + 4, 2))
+ end
+ end
+ end
+ }
+end
+
+-- TOSERVER_DELETEDBLOCKS
+-- TODO: Test this
+
+do
+ local f_count = ProtoField.uint8("minetest.client.deletedblocks_count", "Count", base.DEC)
+ local f_block = ProtoField.bytes("minetset.client.deletedblocks_block", "Block", base.DEC)
+ local f_x = ProtoField.int16("minetest.client.deletedblocks_x", "Block position X", base.DEC)
+ local f_y = ProtoField.int16("minetest.client.deletedblocks_y", "Block position Y", base.DEC)
+ local f_z = ProtoField.int16("minetest.client.deletedblocks_z", "Block position Z", base.DEC)
+
+ minetest_client_commands[0x25] = {
+ "DELETEDBLOCKS", 3,
+ { f_count, f_block, f_x, f_y, f_z },
+ function(buffer, pinfo, tree, t)
+ t:add(f_count, buffer(2,1))
+ local count = buffer(2,1):uint()
+ if minetest_check_length(buffer, 3 + 6*count, t) then
+ pinfo.cols.info:append(" * " .. count)
+ local index
+ for index = 0, count - 1 do
+ local pos = 3 + 6*index
+ local t2 = t:add(f_block, buffer(pos, 6))
+ t2:set_text("Block, X: " .. buffer(pos, 2):int()
+ .. ", Y: " .. buffer(pos + 2, 2):int()
+ .. ", Z: " .. buffer(pos + 4, 2):int())
+ t2:add(f_x, buffer(pos, 2))
+ t2:add(f_y, buffer(pos + 2, 2))
+ t2:add(f_z, buffer(pos + 4, 2))
+ end
+ end
+ end
+ }
+end
+
+-- TOSERVER_ADDNODE_FROM_INVENTORY (obsolete)
+
+minetest_client_commands[0x26] = { "ADDNODE_FROM_INVENTORY", 2 }
+minetest_client_obsolete[0x26] = true
+
+-- TOSERVER_CLICK_OBJECT
+-- TODO: Test this
+
+do
+ local vs_button = {
+ [0] = "left",
+ [1] = "right"
+ }
+
+ local f_button = ProtoField.uint8("minetest.client.click_object_button", "Button", base.DEC, vs_button)
+ local f_blockpos_x = ProtoField.int16("minetest.client.click_object_blockpos_x", "Block position X", base.DEC)
+ local f_blockpos_y = ProtoField.int16("minetest.client.click_object_blockpos_y", "Block position Y", base.DEC)
+ local f_blockpos_z = ProtoField.int16("minetest.client.click_object_blockpos_z", "Block position Z", base.DEC)
+ local f_id = ProtoField.int16("minetest.client.click_object_id", "ID", base.DEC)
+ local f_item = ProtoField.uint16("minetest.client.click_object_item", "Item", base.DEC)
+
+ minetest_client_commands[0x27] = {
+ "CLICK_OBJECT", 13,
+ { f_button, f_blockpos_x, f_blockpos_y, f_blockpos_z, f_id, f_item },
+ function(buffer, pinfo, tree, t)
+ t:add(f_button, buffer(2,1))
+ t:add(f_blockpos_x, buffer(3,2))
+ t:add(f_blockpos_y, buffer(5,2))
+ t:add(f_blockpos_z, buffer(7,2))
+ t:add(f_id, buffer(9,2))
+ t:add(f_item, buffer(11,2))
+ end
+ }
+end
+
+-- TOSERVER_GROUND_ACTION
+
+do
+ local vs_action = {
+ [0] = "Start digging",
+ [1] = "Place block",
+ [2] = "Stop digging",
+ [3] = "Digging completed"
+ }
+
+ local f_action = ProtoField.uint8("minetest.client.ground_action", "Action", base.DEC, vs_action)
+ local f_nodepos_undersurface_x = ProtoField.int16(
+ "minetest.client.ground_action_nodepos_undersurface_x",
+ "Node position (under surface) X")
+ local f_nodepos_undersurface_y = ProtoField.int16(
+ "minetest.client.ground_action_nodepos_undersurface_y",
+ "Node position (under surface) Y")
+ local f_nodepos_undersurface_z = ProtoField.int16(
+ "minetest.client.ground_action_nodepos_undersurface_z",
+ "Node position (under surface) Z")
+ local f_nodepos_abovesurface_x = ProtoField.int16(
+ "minetest.client.ground_action_nodepos_abovesurface_x",
+ "Node position (above surface) X")
+ local f_nodepos_abovesurface_y = ProtoField.int16(
+ "minetest.client.ground_action_nodepos_abovesurface_y",
+ "Node position (above surface) Y")
+ local f_nodepos_abovesurface_z = ProtoField.int16(
+ "minetest.client.ground_action_nodepos_abovesurface_z",
+ "Node position (above surface) Z")
+ local f_item = ProtoField.uint16("minetest.client.ground_action_item", "Item")
+
+ minetest_client_commands[0x28] = {
+ "GROUND_ACTION", 17,
+ { f_action,
+ f_nodepos_undersurface_x,
+ f_nodepos_undersurface_y,
+ f_nodepos_undersurface_z,
+ f_nodepos_abovesurface_x,
+ f_nodepos_abovesurface_y,
+ f_nodepos_abovesurface_z,
+ f_item },
+ function(buffer, pinfo, tree, t)
+ t:add(f_action, buffer(2,1))
+ t:add(f_nodepos_undersurface_x, buffer(3,2))
+ t:add(f_nodepos_undersurface_y, buffer(5,2))
+ t:add(f_nodepos_undersurface_z, buffer(7,2))
+ t:add(f_nodepos_abovesurface_x, buffer(9,2))
+ t:add(f_nodepos_abovesurface_y, buffer(11,2))
+ t:add(f_nodepos_abovesurface_z, buffer(13,2))
+ t:add(f_item, buffer(15,2))
+ end
+ }
+end
+
+-- TOSERVER_RELEASE (obsolete)
+
+minetest_client_commands[0x29] = { "RELEASE", 2 }
+minetest_client_obsolete[0x29] = true
+
+-- TOSERVER_SIGNTEXT (old signs)
+-- TODO: Test this or mark obsolete
+
+do
+ local f_blockpos_x = ProtoField.int16("minetest.client.signtext_blockpos_x", "Block position X", base.DEC)
+ local f_blockpos_y = ProtoField.int16("minetest.client.signtext_blockpos_y", "Block position Y", base.DEC)
+ local f_blockpos_z = ProtoField.int16("minetest.client.signtext_blockpos_z", "Block position Z", base.DEC)
+ local f_id = ProtoField.int16("minetest.client.signtext_id", "ID", base.DEC)
+ local f_textlen = ProtoField.uint16("minetest.client.signtext_textlen", "Text length", base.DEC)
+ local f_text = ProtoField.string("minetest.client.signtext_text", "Text")
+
+ minetest_client_commands[0x30] = {
+ "SIGNTEXT", 12,
+ { f_blockpos_x, f_blockpos_y, f_blockpos_z, f_id, f_textlen, f_text },
+ function(buffer, pinfo, tree, t)
+ t:add(f_blockpos_x, buffer(2,2))
+ t:add(f_blockpos_y, buffer(4,2))
+ t:add(f_blockpos_z, buffer(6,2))
+ t:add(f_id, buffer(8,2))
+ t:add(f_textlen, buffer(10,2))
+ local textlen = buffer(10,2):uint()
+ if minetest_check_length(buffer, 12 + textlen, t) then
+ t:add(f_text, buffer, buffer(12,textlen))
+ end
+ end
+ }
+end
+
+-- TOSERVER_INVENTORY_ACTION
+
+do
+ local f_action = ProtoField.string("minetest.client.inventory_action", "Action")
+
+ minetest_client_commands[0x31] = {
+ "INVENTORY_ACTION", 2,
+ { f_action },
+ function(buffer, pinfo, tree, t)
+ t:add(f_action, buffer(2, buffer:len() - 2))
+ end
+ }
+end
+
+-- TOSERVER_CHAT_MESSAGE
+
+do
+ local f_length = ProtoField.uint16("minetest.client.chat_message_length", "Length", base.DEC)
+ local f_message = ProtoField.string("minetest.client.chat_message", "Message")
+
+ minetest_client_commands[0x32] = {
+ "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
+
+-- TOSERVER_SIGNNODETEXT
+
+do
+ local f_pos_x = ProtoField.int16("minetest.client.signnodetext_pos_x", "Block position X", base.DEC)
+ local f_pos_y = ProtoField.int16("minetest.client.signnodetext_pos_y", "Block position Y", base.DEC)
+ local f_pos_z = ProtoField.int16("minetest.client.signnodetext_pos_z", "Block position Z", base.DEC)
+ local f_textlen = ProtoField.uint16("minetest.client.signnodetext_textlen", "Text length", base.DEC)
+ local f_text = ProtoField.string("minetest.client.signnodetext_text", "Text")
+
+ minetest_client_commands[0x33] = {
+ "SIGNNODETEXT", 10,
+ { f_pos_x, f_pos_y, f_pos_z, f_textlen, f_text },
+ function(buffer, pinfo, tree, t)
+ t:add(f_pos_x, buffer(2,2))
+ t:add(f_pos_y, buffer(4,2))
+ t:add(f_pos_z, buffer(6,2))
+ t:add(f_textlen, buffer(8,2))
+ local textlen = buffer(8,2):uint()
+ if minetest_check_length(buffer, 10 + textlen, t) then
+ t:add(f_text, buffer(10, textlen))
+ end
+ end
+ }
+end
+
+-- TOSERVER_CLICK_ACTIVEOBJECT
+
+do
+ local vs_button = {
+ [0] = "left",
+ [1] = "right"
+ }
+
+ local f_button = ProtoField.uint8("minetest.client.click_activeobject_button", "Button", base.DEC, vs_button)
+ local f_id = ProtoField.uint16("minetest.client.click_activeobject_id", "ID", base.DEC)
+ local f_item = ProtoField.uint16("minetest.client.click_activeobject_item", "Item", base.DEC)
+
+ minetest_client_commands[0x34] = {
+ "CLICK_ACTIVEOBJECT", 7,
+ { f_button, f_id, f_item },
+ function(buffer, pinfo, tree, t)
+ t:add(f_button, buffer(2,1))
+ t:add(f_id, buffer(3,2))
+ t:add(f_item, buffer(5,2))
+ end
+ }
+end
+
+-- TOSERVER_DAMAGE
+
+do
+ local f_amount = ProtoField.uint8("minetest.client.damage_amount", "Amount", base.DEC)
+
+ minetest_client_commands[0x35] = {
+ "DAMAGE", 3,
+ { f_amount },
+ function(buffer, pinfo, tree, t)
+ t:add(f_amount, buffer(2,1))
+ end
+ }
+end
+
+-- TOSERVER_PASSWORD
+
+do
+ local f_old_password = ProtoField.string("minetest.client.password_old", "Old password")
+ local f_new_password = ProtoField.string("minetest.client.password_new", "New password")
+
+ minetest_client_commands[0x36] = {
+ "PASSWORD", 58,
+ { f_old_password, f_new_password },
+ function(buffer, pinfo, tree, t)
+ t:add(f_old_password, buffer(2,28))
+ t:add(f_new_password, buffer(30,28))
+ end
+ }
+end
+
+-- TOSERVER_PLAYERITEM
+
+do
+ local f_item = ProtoField.uint16("minetest.client.playeritem_item", "Wielded item")
+
+ minetest_client_commands[0x37] = {
+ "PLAYERITEM", 4,
+ { 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
+
projects / oweals / minetest.git / commitdiff