builtin/game/chatcommands.lua

   1 -- Minetest: builtin/chatcommands.lua
   2
   3 --
   4 -- Chat command handler
   5 --
   6
   7 core.chatcommands = {}
   8 function core.register_chatcommand(cmd, def)
   9         def = def or {}
  10         def.params = def.params or ""
  11         def.description = def.description or ""
  12         def.privs = def.privs or {}
  13         core.chatcommands[cmd] = def
  14 end
  15
  16 if core.setting_getbool("mod_profiling") then
  17         local tracefct = profiling_print_log
  18         profiling_print_log = nil
  19         core.register_chatcommand("save_mod_profile",
  20                         {
  21                                 params      = "",
  22                                 description = "save mod profiling data to logfile " ..
  23                                                 "(depends on default loglevel)",
  24                                 func        = tracefct,
  25                                 privs       = { server=true }
  26                         })
  27 end
  28
  29 core.register_on_chat_message(function(name, message)
  30         local cmd, param = string.match(message, "^/([^ ]+) *(.*)")
  31         if not param then
  32                 param = ""
  33         end
  34         local cmd_def = core.chatcommands[cmd]
  35         if not cmd_def then
  36                 return false
  37         end
  38         local has_privs, missing_privs = core.check_player_privs(name, cmd_def.privs)
  39         if has_privs then
  40                 local success, message = cmd_def.func(name, param)
  41                 if message then
  42                         core.chat_send_player(name, message)
  43                 end
  44         else
  45                 core.chat_send_player(name, "You don't have permission"
  46                                 .. " to run this command (missing privileges: "
  47                                 .. table.concat(missing_privs, ", ") .. ")")
  48         end
  49         return true  -- Handled chat message
  50 end)
  51
  52 --
  53 -- Chat commands
  54 --
  55 core.register_chatcommand("me", {
  56         params = "<action>",
  57         description = "chat action (eg. /me orders a pizza)",
  58         privs = {shout=true},
  59         func = function(name, param)
  60                 core.chat_send_all("* " .. name .. " " .. param)
  61         end,
  62 })
  63
  64 core.register_chatcommand("help", {
  65         privs = {},
  66         params = "[all/privs/<cmd>]",
  67         description = "Get help for commands or list privileges",
  68         func = function(name, param)
  69                 local function format_help_line(cmd, def)
  70                         local msg = "/"..cmd
  71                         if def.params and def.params ~= "" then
  72                                 msg = msg .. " " .. def.params
  73                         end
  74                         if def.description and def.description ~= "" then
  75                                 msg = msg .. ": " .. def.description
  76                         end
  77                         return msg
  78                 end
  79                 if param == "" then
  80                         local msg = ""
  81                         local cmds = {}
  82                         for cmd, def in pairs(core.chatcommands) do
  83                                 if core.check_player_privs(name, def.privs) then
  84                                         table.insert(cmds, cmd)
  85                                 end
  86                         end
  87                         table.sort(cmds)
  88                         return true, "Available commands: " .. table.concat(cmds, " ") .. "\n"
  89                                         .. "Use '/help <cmd>' to get more information,"
  90                                         .. " or '/help all' to list everything."
  91                 elseif param == "all" then
  92                         local cmds = {}
  93                         for cmd, def in pairs(core.chatcommands) do
  94                                 if core.check_player_privs(name, def.privs) then
  95                                         table.insert(cmds, format_help_line(cmd, def))
  96                                 end
  97                         end
  98                         table.sort(cmds)
  99                         return true, "Available commands:\n"..table.concat(cmds, "\n")
 100                 elseif param == "privs" then
 101                         local privs = {}
 102                         for priv, def in pairs(core.registered_privileges) do
 103                                 table.insert(privs, priv .. ": " .. def.description)
 104                         end
 105                         table.sort(privs)
 106                         return true, "Available privileges:\n"..table.concat(privs, "\n")
 107                 else
 108                         local cmd = param
 109                         local def = core.chatcommands[cmd]
 110                         if not def then
 111                                 return false, "Command not available: "..cmd
 112                         else
 113                                 return true, format_help_line(cmd, def)
 114                         end
 115                 end
 116         end,
 117 })
 118
 119 core.register_chatcommand("privs", {
 120         params = "<name>",
 121         description = "print out privileges of player",
 122         func = function(name, param)
 123                 param = (param ~= "" and param or name)
 124                 return true, "Privileges of " .. param .. ": "
 125                         .. core.privs_to_string(
 126                                 core.get_player_privs(param), ' ')
 127         end,
 128 })
 129 core.register_chatcommand("grant", {
 130         params = "<name> <privilege>|all",
 131         description = "Give privilege to player",
 132         func = function(name, param)
 133                 if not core.check_player_privs(name, {privs=true}) and
 134                                 not core.check_player_privs(name, {basic_privs=true}) then
 135                         return false, "Your privileges are insufficient."
 136                 end
 137                 local grantname, grantprivstr = string.match(param, "([^ ]+) (.+)")
 138                 if not grantname or not grantprivstr then
 139                         return false, "Invalid parameters (see /help grant)"
 140                 elseif not core.auth_table[grantname] then
 141                         return false, "Player " .. grantname .. " does not exist."
 142                 end
 143                 local grantprivs = core.string_to_privs(grantprivstr)
 144                 if grantprivstr == "all" then
 145                         grantprivs = core.registered_privileges
 146                 end
 147                 local privs = core.get_player_privs(grantname)
 148                 local privs_unknown = ""
 149                 for priv, _ in pairs(grantprivs) do
 150                         if priv ~= "interact" and priv ~= "shout" and
 151                                         not core.check_player_privs(name, {privs=true}) then
 152                                 return false, "Your privileges are insufficient."
 153                         end
 154                         if not core.registered_privileges[priv] then
 155                                 privs_unknown = privs_unknown .. "Unknown privilege: " .. priv .. "\n"
 156                         end
 157                         privs[priv] = true
 158                 end
 159                 if privs_unknown ~= "" then
 160                         return false, privs_unknown
 161                 end
 162                 core.set_player_privs(grantname, privs)
 163                 core.log("action", name..' granted ('..core.privs_to_string(grantprivs, ', ')..') privileges to '..grantname)
 164                 if grantname ~= name then
 165                         core.chat_send_player(grantname, name
 166                                         .. " granted you privileges: "
 167                                         .. core.privs_to_string(grantprivs, ' '))
 168                 end
 169                 return true, "Privileges of " .. grantname .. ": "
 170                         .. core.privs_to_string(
 171                                 core.get_player_privs(grantname), ' ')
 172         end,
 173 })
 174 core.register_chatcommand("revoke", {
 175         params = "<name> <privilege>|all",
 176         description = "Remove privilege from player",
 177         privs = {},
 178         func = function(name, param)
 179                 if not core.check_player_privs(name, {privs=true}) and
 180                                 not core.check_player_privs(name, {basic_privs=true}) then
 181                         return false, "Your privileges are insufficient."
 182                 end
 183                 local revoke_name, revoke_priv_str = string.match(param, "([^ ]+) (.+)")
 184                 if not revoke_name or not revoke_priv_str then
 185                         return false, "Invalid parameters (see /help revoke)"
 186                 elseif not core.auth_table[revoke_name] then
 187                         return false, "Player " .. revoke_name .. " does not exist."
 188                 end
 189                 local revoke_privs = core.string_to_privs(revoke_priv_str)
 190                 local privs = core.get_player_privs(revoke_name)
 191                 for priv, _ in pairs(revoke_privs) do
 192                         if priv ~= "interact" and priv ~= "shout" and priv ~= "interact_extra" and
 193                                         not core.check_player_privs(name, {privs=true}) then
 194                                 return false, "Your privileges are insufficient."
 195                         end
 196                 end
 197                 if revoke_priv_str == "all" then
 198                         privs = {}
 199                 else
 200                         for priv, _ in pairs(revoke_privs) do
 201                                 privs[priv] = nil
 202                         end
 203                 end
 204                 core.set_player_privs(revoke_name, privs)
 205                 core.log("action", name..' revoked ('
 206                                 ..core.privs_to_string(revoke_privs, ', ')
 207                                 ..') privileges from '..revoke_name)
 208                 if revoke_name ~= name then
 209                         core.chat_send_player(revoke_name, name
 210                                         .. " revoked privileges from you: "
 211                                         .. core.privs_to_string(revoke_privs, ' '))
 212                 end
 213                 return true, "Privileges of " .. revoke_name .. ": "
 214                         .. core.privs_to_string(
 215                                 core.get_player_privs(revoke_name), ' ')
 216         end,
 217 })
 218
 219 core.register_chatcommand("setpassword", {
 220         params = "<name> <password>",
 221         description = "set given password",
 222         privs = {password=true},
 223         func = function(name, param)
 224                 local toname, raw_password = string.match(param, "^([^ ]+) +(.+)$")
 225                 if not toname then
 226                         toname = param:match("^([^ ]+) *$")
 227                         raw_password = nil
 228                 end
 229                 if not toname then
 230                         return false, "Name field required"
 231                 end
 232                 local actstr = "?"
 233                 if not raw_password then
 234                         core.set_player_password(toname, "")
 235                         actstr = "cleared"
 236                 else
 237                         core.set_player_password(toname,
 238                                         core.get_password_hash(toname,
 239                                                         raw_password))
 240                         actstr = "set"
 241                 end
 242                 if toname ~= name then
 243                         core.chat_send_player(toname, "Your password was "
 244                                         .. actstr .. " by " .. name)
 245                 end
 246                 return true, "Password of player \"" .. toname .. "\" " .. actstr
 247         end,
 248 })
 249
 250 core.register_chatcommand("clearpassword", {
 251         params = "<name>",
 252         description = "set empty password",
 253         privs = {password=true},
 254         func = function(name, param)
 255                 toname = param
 256                 if toname == "" then
 257                         return false, "Name field required"
 258                 end
 259                 core.set_player_password(toname, '')
 260                 return true, "Password of player \"" .. toname .. "\" cleared"
 261         end,
 262 })
 263
 264 core.register_chatcommand("auth_reload", {
 265         params = "",
 266         description = "reload authentication data",
 267         privs = {server=true},
 268         func = function(name, param)
 269                 local done = core.auth_reload()
 270                 return done, (done and "Done." or "Failed.")
 271         end,
 272 })
 273
 274 core.register_chatcommand("teleport", {
 275         params = "<X>,<Y>,<Z> | <to_name> | <name> <X>,<Y>,<Z> | <name> <to_name>",
 276         description = "teleport to given position",
 277         privs = {teleport=true},
 278         func = function(name, param)
 279                 -- Returns (pos, true) if found, otherwise (pos, false)
 280                 local function find_free_position_near(pos)
 281                         local tries = {
 282                                 {x=1,y=0,z=0},
 283                                 {x=-1,y=0,z=0},
 284                                 {x=0,y=0,z=1},
 285                                 {x=0,y=0,z=-1},
 286                         }
 287                         for _, d in ipairs(tries) do
 288                                 local p = {x = pos.x+d.x, y = pos.y+d.y, z = pos.z+d.z}
 289                                 local n = core.get_node_or_nil(p)
 290                                 if n and n.name then
 291                                         local def = core.registered_nodes[n.name]
 292                                         if def and not def.walkable then
 293                                                 return p, true
 294                                         end
 295                                 end
 296                         end
 297                         return pos, false
 298                 end
 299
 300                 local teleportee = nil
 301                 local p = {}
 302                 p.x, p.y, p.z = string.match(param, "^([%d.-]+)[, ] *([%d.-]+)[, ] *([%d.-]+)$")
 303                 p.x = tonumber(p.x)
 304                 p.y = tonumber(p.y)
 305                 p.z = tonumber(p.z)
 306                 teleportee = core.get_player_by_name(name)
 307                 if teleportee and p.x and p.y and p.z then
 308                         teleportee:setpos(p)
 309                         return true, "Teleporting to "..core.pos_to_string(p)
 310                 end
 311
 312                 local teleportee = nil
 313                 local p = nil
 314                 local target_name = nil
 315                 target_name = param:match("^([^ ]+)$")
 316                 teleportee = core.get_player_by_name(name)
 317                 if target_name then
 318                         local target = core.get_player_by_name(target_name)
 319                         if target then
 320                                 p = target:getpos()
 321                         end
 322                 end
 323                 if teleportee and p then
 324                         p = find_free_position_near(p)
 325                         teleportee:setpos(p)
 326                         return true, "Teleporting to " .. target_name
 327                                         .. " at "..core.pos_to_string(p)
 328                 end
 329
 330                 if core.check_player_privs(name, {bring=true}) then
 331                         local teleportee = nil
 332                         local p = {}
 333                         local teleportee_name = nil
 334                         teleportee_name, p.x, p.y, p.z = param:match(
 335                                         "^([^ ]+) +([%d.-]+)[, ] *([%d.-]+)[, ] *([%d.-]+)$")
 336                         p.x, p.y, p.z = tonumber(p.x), tonumber(p.y), tonumber(p.z)
 337                         if teleportee_name then
 338                                 teleportee = core.get_player_by_name(teleportee_name)
 339                         end
 340                         if teleportee and p.x and p.y and p.z then
 341                                 teleportee:setpos(p)
 342                                 return true, "Teleporting " .. teleportee_name
 343                                                 .. " to " .. core.pos_to_string(p)
 344                         end
 345
 346                         local teleportee = nil
 347                         local p = nil
 348                         local teleportee_name = nil
 349                         local target_name = nil
 350                         teleportee_name, target_name = string.match(param, "^([^ ]+) +([^ ]+)$")
 351                         if teleportee_name then
 352                                 teleportee = core.get_player_by_name(teleportee_name)
 353                         end
 354                         if target_name then
 355                                 local target = core.get_player_by_name(target_name)
 356                                 if target then
 357                                         p = target:getpos()
 358                                 end
 359                         end
 360                         if teleportee and p then
 361                                 p = find_free_position_near(p)
 362                                 teleportee:setpos(p)
 363                                 return true, "Teleporting " .. teleportee_name
 364                                                 .. " to " .. target_name
 365                                                 .. " at " .. core.pos_to_string(p)
 366                         end
 367                 end
 368
 369                 return false, 'Invalid parameters ("' .. param
 370                                 .. '") or player not found (see /help teleport)'
 371         end,
 372 })
 373
 374 core.register_chatcommand("set", {
 375         params = "[-n] <name> <value> | <name>",
 376         description = "set or read server configuration setting",
 377         privs = {server=true},
 378         func = function(name, param)
 379                 local arg, setname, setvalue = string.match(param, "(-[n]) ([^ ]+) (.+)")
 380                 if arg and arg == "-n" and setname and setvalue then
 381                         core.setting_set(setname, setvalue)
 382                         return true, setname .. " = " .. setvalue
 383                 end
 384                 local setname, setvalue = string.match(param, "([^ ]+) (.+)")
 385                 if setname and setvalue then
 386                         if not core.setting_get(setname) then
 387                                 return false, "Failed. Use '/set -n <name> <value>' to create a new setting."
 388                         end
 389                         core.setting_set(setname, setvalue)
 390                         return true, setname .. " = " .. setvalue
 391                 end
 392                 local setname = string.match(param, "([^ ]+)")
 393                 if setname then
 394                         local setvalue = core.setting_get(setname)
 395                         if not setvalue then
 396                                 setvalue = "<not set>"
 397                         end
 398                         return true, setname .. " = " .. setvalue
 399                 end
 400                 return false, "Invalid parameters (see /help set)."
 401         end,
 402 })
 403
 404 core.register_chatcommand("mods", {
 405         params = "",
 406         description = "List mods installed on the server",
 407         privs = {},
 408         func = function(name, param)
 409                 return true, table.concat(core.get_modnames(), ", ")
 410         end,
 411 })
 412
 413 local function handle_give_command(cmd, giver, receiver, stackstring)
 414         core.log("action", giver .. " invoked " .. cmd
 415                         .. ', stackstring="' .. stackstring .. '"')
 416         local itemstack = ItemStack(stackstring)
 417         if itemstack:is_empty() then
 418                 return false, "Cannot give an empty item"
 419         elseif not itemstack:is_known() then
 420                 return false, "Cannot give an unknown item"
 421         end
 422         local receiverref = core.get_player_by_name(receiver)
 423         if receiverref == nil then
 424                 return false, receiver .. " is not a known player"
 425         end
 426         local leftover = receiverref:get_inventory():add_item("main", itemstack)
 427         if leftover:is_empty() then
 428                 partiality = ""
 429         elseif leftover:get_count() == itemstack:get_count() then
 430                 partiality = "could not be "
 431         else
 432                 partiality = "partially "
 433         end
 434         -- The actual item stack string may be different from what the "giver"
 435         -- entered (e.g. big numbers are always interpreted as 2^16-1).
 436         stackstring = itemstack:to_string()
 437         if giver == receiver then
 438                 return true, ("%q %sadded to inventory.")
 439                                 :format(stackstring, partiality)
 440         else
 441                 core.chat_send_player(receiver, ("%q %sadded to inventory.")
 442                                 :format(stackstring, partiality))
 443                 return true, ("%q %sadded to %s's inventory.")
 444                                 :format(stackstring, partiality, receiver)
 445         end
 446 end
 447
 448 core.register_chatcommand("give", {
 449         params = "<name> <ItemString>",
 450         description = "give item to player",
 451         privs = {give=true},
 452         func = function(name, param)
 453                 local toname, itemstring = string.match(param, "^([^ ]+) +(.+)$")
 454                 if not toname or not itemstring then
 455                         return false, "Name and ItemString required"
 456                 end
 457                 return handle_give_command("/give", name, toname, itemstring)
 458         end,
 459 })
 460
 461 core.register_chatcommand("giveme", {
 462         params = "<ItemString>",
 463         description = "give item to yourself",
 464         privs = {give=true},
 465         func = function(name, param)
 466                 local itemstring = string.match(param, "(.+)$")
 467                 if not itemstring then
 468                         return false, "ItemString required"
 469                 end
 470                 return handle_give_command("/giveme", name, name, itemstring)
 471         end,
 472 })
 473
 474 core.register_chatcommand("spawnentity", {
 475         params = "<EntityName>",
 476         description = "Spawn entity at your position",
 477         privs = {give=true, interact=true},
 478         func = function(name, param)
 479                 local entityname = string.match(param, "(.+)$")
 480                 if not entityname then
 481                         return false, "EntityName required"
 482                 end
 483                 core.log("action", ("/spawnentity invoked, entityname=%q")
 484                                 :format(entityname))
 485                 local player = core.get_player_by_name(name)
 486                 if player == nil then
 487                         core.log("error", "Unable to spawn entity, player is nil")
 488                         return false, "Unable to spawn entity, player is nil"
 489                 end
 490                 local p = player:getpos()
 491                 p.y = p.y + 1
 492                 core.add_entity(p, entityname)
 493                 return true, ("%q spawned."):format(entityname)
 494         end,
 495 })
 496
 497 core.register_chatcommand("pulverize", {
 498         params = "",
 499         description = "Destroy item in hand",
 500         func = function(name, param)
 501                 local player = core.get_player_by_name(name)
 502                 if not player then
 503                         core.log("error", "Unable to pulverize, no player.")
 504                         return false, "Unable to pulverize, no player."
 505                 end
 506                 if player:get_wielded_item():is_empty() then
 507                         return false, "Unable to pulverize, no item in hand."
 508                 end
 509                 player:set_wielded_item(nil)
 510                 return true, "An item was pulverized."
 511         end,
 512 })
 513
 514 -- Key = player name
 515 core.rollback_punch_callbacks = {}
 516
 517 core.register_on_punchnode(function(pos, node, puncher)
 518         local name = puncher:get_player_name()
 519         if core.rollback_punch_callbacks[name] then
 520                 core.rollback_punch_callbacks[name](pos, node, puncher)
 521                 core.rollback_punch_callbacks[name] = nil
 522         end
 523 end)
 524
 525 core.register_chatcommand("rollback_check", {
 526         params = "[<range>] [<seconds>] [limit]",
 527         description = "Check who has last touched a node or near it,"
 528                         .. " max. <seconds> ago (default range=0,"
 529                         .. " seconds=86400=24h, limit=5)",
 530         privs = {rollback=true},
 531         func = function(name, param)
 532                 local range, seconds, limit =
 533                         param:match("(%d+) *(%d*) *(%d*)")
 534                 range = tonumber(range) or 0
 535                 seconds = tonumber(seconds) or 86400
 536                 limit = tonumber(limit) or 5
 537                 if limit > 100 then
 538                         return false, "That limit is too high!"
 539                 end
 540
 541                 core.rollback_punch_callbacks[name] = function(pos, node, puncher)
 542                         local name = puncher:get_player_name()
 543                         core.chat_send_player(name, "Checking " .. core.pos_to_string(pos) .. "...")
 544                         local actions = core.rollback_get_node_actions(pos, range, seconds, limit)
 545                         local num_actions = #actions
 546                         if num_actions == 0 then
 547                                 core.chat_send_player(name, "Nobody has touched"
 548                                                 .. " the specified location in "
 549                                                 .. seconds .. " seconds")
 550                                 return
 551                         end
 552                         local time = os.time()
 553                         for i = num_actions, 1, -1 do
 554                                 local action = actions[i]
 555                                 core.chat_send_player(name,
 556                                         ("%s %s %s -> %s %d seconds ago.")
 557                                                 :format(
 558                                                         core.pos_to_string(action.pos),
 559                                                         action.actor,
 560                                                         action.oldnode.name,
 561                                                         action.newnode.name,
 562                                                         time - action.time))
 563                         end
 564                 end
 565
 566                 return true, "Punch a node (range=" .. range .. ", seconds="
 567                                 .. seconds .. "s, limit=" .. limit .. ")"
 568         end,
 569 })
 570
 571 core.register_chatcommand("rollback", {
 572         params = "<player name> [<seconds>] | :<actor> [<seconds>]",
 573         description = "revert actions of a player; default for <seconds> is 60",
 574         privs = {rollback=true},
 575         func = function(name, param)
 576                 local target_name, seconds = string.match(param, ":([^ ]+) *(%d*)")
 577                 if not target_name then
 578                         local player_name = nil
 579                         player_name, seconds = string.match(param, "([^ ]+) *(%d*)")
 580                         if not player_name then
 581                                 return false, "Invalid parameters. See /help rollback"
 582                                                 .. " and /help rollback_check."
 583                         end
 584                         target_name = "player:"..player_name
 585                 end
 586                 seconds = tonumber(seconds) or 60
 587                 core.chat_send_player(name, "Reverting actions of "
 588                                 .. target_name .. " since "
 589                                 .. seconds .. " seconds.")
 590                 local success, log = core.rollback_revert_actions_by(
 591                                 target_name, seconds)
 592                 local response = ""
 593                 if #log > 100 then
 594                         response = "(log is too long to show)\n"
 595                 else
 596                         for _, line in pairs(log) do
 597                                 response = response .. line .. "\n"
 598                         end
 599                 end
 600                 response = response .. "Reverting actions "
 601                                 .. (success and "succeeded." or "FAILED.")
 602                 return success, response
 603         end,
 604 })
 605
 606 core.register_chatcommand("status", {
 607         description = "Print server status",
 608         func = function(name, param)
 609                 return true, core.get_server_status()
 610         end,
 611 })
 612
 613 core.register_chatcommand("time", {
 614         params = "<0...24000>",
 615         description = "set time of day",
 616         privs = {settime=true},
 617         func = function(name, param)
 618                 if param == "" then
 619                         return false, "Missing time."
 620                 end
 621                 local newtime = tonumber(param)
 622                 if newtime == nil then
 623                         return false, "Invalid time."
 624                 end
 625                 core.set_timeofday((newtime % 24000) / 24000)
 626                 core.log("action", name .. " sets time " .. newtime)
 627                 return true, "Time of day changed."
 628         end,
 629 })
 630
 631 core.register_chatcommand("shutdown", {
 632         description = "shutdown server",
 633         privs = {server=true},
 634         func = function(name, param)
 635                 core.log("action", name .. " shuts down server")
 636                 core.request_shutdown()
 637                 core.chat_send_all("*** Server shutting down (operator request).")
 638         end,
 639 })
 640
 641 core.register_chatcommand("ban", {
 642         params = "<name>",
 643         description = "Ban IP of player",
 644         privs = {ban=true},
 645         func = function(name, param)
 646                 if param == "" then
 647                         return true, "Ban list: " .. core.get_ban_list()
 648                 end
 649                 if not core.get_player_by_name(param) then
 650                         return false, "No such player."
 651                 end
 652                 if not core.ban_player(param) then
 653                         return false, "Failed to ban player."
 654                 end
 655                 local desc = core.get_ban_description(param)
 656                 core.log("action", name .. " bans " .. desc .. ".")
 657                 return true, "Banned " .. desc .. "."
 658         end,
 659 })
 660
 661 core.register_chatcommand("unban", {
 662         params = "<name/ip>",
 663         description = "remove IP ban",
 664         privs = {ban=true},
 665         func = function(name, param)
 666                 if not core.unban_player_or_ip(param) then
 667                         return false, "Failed to unban player/IP."
 668                 end
 669                 core.log("action", name .. " unbans " .. param)
 670                 return true, "Unbanned " .. param
 671         end,
 672 })
 673
 674 core.register_chatcommand("kick", {
 675         params = "<name> [reason]",
 676         description = "kick a player",
 677         privs = {kick=true},
 678         func = function(name, param)
 679                 local tokick, reason = param:match("([^ ]+) (.+)")
 680                 tokick = tokick or param
 681                 if not core.kick_player(tokick, reason) then
 682                         return false, "Failed to kick player " .. tokick
 683                 end
 684                 core.log("action", name .. " kicked " .. tokick)
 685                 return true, "Kicked " .. tokick
 686         end,
 687 })
 688
 689 core.register_chatcommand("clearobjects", {
 690         description = "clear all objects in world",
 691         privs = {server=true},
 692         func = function(name, param)
 693                 core.log("action", name .. " clears all objects.")
 694                 core.chat_send_all("Clearing all objects.  This may take long."
 695                                 .. "  You may experience a timeout.  (by "
 696                                 .. name .. ")")
 697                 core.clear_objects()
 698                 core.log("action", "Object clearing done.")
 699                 core.chat_send_all("*** Cleared all objects.")
 700         end,
 701 })
 702
 703 core.register_chatcommand("msg", {
 704         params = "<name> <message>",
 705         description = "Send a private message",
 706         privs = {shout=true},
 707         func = function(name, param)
 708                 local sendto, message = param:match("^(%S+)%s(.+)$")
 709                 if not sendto then
 710                         return false, "Invalid usage, see /help msg."
 711                 end
 712                 if not core.get_player_by_name(sendto) then
 713                         return false, "The player " .. sendto
 714                                         .. " is not online."
 715                 end
 716                 core.log("action", "PM from " .. name .. " to " .. sendto
 717                                 .. ": " .. message)
 718                 core.chat_send_player(sendto, "PM from " .. name .. ": "
 719                                 .. message)
 720                 return true, "Message sent."
 721         end,
 722 })
 723