minetest.git - modified minetest for gpcfs purposes

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Diffstat (limited to 'minetest.conf.example')

0 files changed, 0 insertions, 0 deletions

-- 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 -- TOSERVER_RESPAWN minetest_client_commands[0x38] = { "RESPAWN", 2 } -------------------------------------------- -- 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 -- TOCLIENT_DEATHSCREEN do local vs_set_camera_point_target = { [0] = "False", [1] = "True" } local f_set_camera_point_target = ProtoField.uint8( "minetest.server.deathscreen_set_camera_point_target", "Set camera point target", base.DEC, vs_set_camera_point_target) local f_camera_point_target_x = ProtoField.int32( "minetest.server.deathscreen_camera_point_target_x", "Camera point target X", base.DEC) local f_camera_point_target_y = ProtoField.int32( "minetest.server.deathscreen_camera_point_target_y", "Camera point target Y", base.DEC) local f_camera_point_target_z = ProtoField.int32( "minetest.server.deathscreen_camera_point_target_z", "Camera point target Z", base.DEC) minetest_server_commands[0x37] = { "DEATHSCREEN", 15, { f_set_camera_point_target, f_camera_point_target_x, f_camera_point_target_y, f_camera_point_target_z}, function(buffer, pinfo, tree, t) t:add(f_set_camera_point_target, buffer(2,1)) t:add(f_camera_point_target_x, buffer(3,4)) t:add(f_camera_point_target_y, buffer(7,4)) t:add(f_camera_point_target_z, buffer(11,4)) 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.


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