src/network/serverpackethandler.cpp

   1 /*
   2 Minetest
   3 Copyright (C) 2015 nerzhul, Loic Blot <loic.blot@unix-experience.fr>
   4
   5 This program is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU Lesser General Public License as published by
   7 the Free Software Foundation; either version 2.1 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU Lesser General Public License for more details.
  14
  15 You should have received a copy of the GNU Lesser General Public License along
  16 with this program; if not, write to the Free Software Foundation, Inc.,
  17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 */
  19
  20 #include "chatmessage.h"
  21 #include "server.h"
  22 #include "log.h"
  23 #include "emerge.h"
  24 #include "mapblock.h"
  25 #include "modchannels.h"
  26 #include "nodedef.h"
  27 #include "remoteplayer.h"
  28 #include "rollback_interface.h"
  29 #include "scripting_server.h"
  30 #include "settings.h"
  31 #include "tool.h"
  32 #include "version.h"
  33 #include "network/connection.h"
  34 #include "network/networkprotocol.h"
  35 #include "network/serveropcodes.h"
  36 #include "server/player_sao.h"
  37 #include "server/serverinventorymgr.h"
  38 #include "util/auth.h"
  39 #include "util/base64.h"
  40 #include "util/pointedthing.h"
  41 #include "util/serialize.h"
  42 #include "util/srp.h"
  43 #include "clientdynamicinfo.h"
  44
  45 void Server::handleCommand_Deprecated(NetworkPacket* pkt)
  46 {
  47         infostream << "Server: " << toServerCommandTable[pkt->getCommand()].name
  48                 << " not supported anymore" << std::endl;
  49 }
  50
  51 void Server::handleCommand_Init(NetworkPacket* pkt)
  52 {
  53
  54         if(pkt->getSize() < 1)
  55                 return;
  56
  57         session_t peer_id = pkt->getPeerId();
  58         RemoteClient *client = getClient(peer_id, CS_Created);
  59
  60         Address addr;
  61         std::string addr_s;
  62         try {
  63                 addr = m_con->GetPeerAddress(peer_id);
  64                 addr_s = addr.serializeString();
  65         } catch (con::PeerNotFoundException &e) {
  66                 /*
  67                  * no peer for this packet found
  68                  * most common reason is peer timeout, e.g. peer didn't
  69                  * respond for some time, your server was overloaded or
  70                  * things like that.
  71                  */
  72                 infostream << "Server::ProcessData(): Canceling: peer " << peer_id <<
  73                         " not found" << std::endl;
  74                 return;
  75         }
  76
  77         if (client->getState() > CS_Created) {
  78                 verbosestream << "Server: Ignoring multiple TOSERVER_INITs from " <<
  79                         addr_s << " (peer_id=" << peer_id << ")" << std::endl;
  80                 return;
  81         }
  82
  83         client->setCachedAddress(addr);
  84
  85         verbosestream << "Server: Got TOSERVER_INIT from " << addr_s <<
  86                 " (peer_id=" << peer_id << ")" << std::endl;
  87
  88         // Do not allow multiple players in simple singleplayer mode.
  89         // This isn't a perfect way to do it, but will suffice for now
  90         if (m_simple_singleplayer_mode && !m_clients.getClientIDs().empty()) {
  91                 infostream << "Server: Not allowing another client (" << addr_s <<
  92                         ") to connect in simple singleplayer mode" << std::endl;
  93                 DenyAccess(peer_id, SERVER_ACCESSDENIED_SINGLEPLAYER);
  94                 return;
  95         }
  96
  97         // First byte after command is maximum supported
  98         // serialization version
  99         u8 client_max;
 100         u16 supp_compr_modes;
 101         u16 min_net_proto_version = 0;
 102         u16 max_net_proto_version;
 103         std::string playerName;
 104
 105         *pkt >> client_max >> supp_compr_modes >> min_net_proto_version
 106                         >> max_net_proto_version >> playerName;
 107
 108         u8 our_max = SER_FMT_VER_HIGHEST_READ;
 109         // Use the highest version supported by both
 110         u8 depl_serial_v = std::min(client_max, our_max);
 111         // If it's lower than the lowest supported, give up.
 112 #if SER_FMT_VER_LOWEST_READ > 0
 113         if (depl_serial_v < SER_FMT_VER_LOWEST_READ)
 114                 depl_serial_v = SER_FMT_VER_INVALID;
 115 #endif
 116
 117         if (depl_serial_v == SER_FMT_VER_INVALID) {
 118                 actionstream << "Server: A mismatched client tried to connect from " <<
 119                         addr_s << " ser_fmt_max=" << (int)client_max << std::endl;
 120                 DenyAccess(peer_id, SERVER_ACCESSDENIED_WRONG_VERSION);
 121                 return;
 122         }
 123
 124         client->setPendingSerializationVersion(depl_serial_v);
 125
 126         /*
 127                 Read and check network protocol version
 128         */
 129
 130         u16 net_proto_version = 0;
 131
 132         // Figure out a working version if it is possible at all
 133         if (max_net_proto_version >= SERVER_PROTOCOL_VERSION_MIN ||
 134                         min_net_proto_version <= SERVER_PROTOCOL_VERSION_MAX) {
 135                 // If maximum is larger than our maximum, go with our maximum
 136                 if (max_net_proto_version > SERVER_PROTOCOL_VERSION_MAX)
 137                         net_proto_version = SERVER_PROTOCOL_VERSION_MAX;
 138                 // Else go with client's maximum
 139                 else
 140                         net_proto_version = max_net_proto_version;
 141         }
 142
 143         verbosestream << "Server: " << addr_s << ": Protocol version: min: "
 144                         << min_net_proto_version << ", max: " << max_net_proto_version
 145                         << ", chosen: " << net_proto_version << std::endl;
 146
 147         client->net_proto_version = net_proto_version;
 148
 149         if ((g_settings->getBool("strict_protocol_version_checking") &&
 150                         net_proto_version != LATEST_PROTOCOL_VERSION) ||
 151                         net_proto_version < SERVER_PROTOCOL_VERSION_MIN ||
 152                         net_proto_version > SERVER_PROTOCOL_VERSION_MAX) {
 153                 actionstream << "Server: A mismatched client tried to connect from " <<
 154                         addr_s << " proto_max=" << (int)max_net_proto_version << std::endl;
 155                 DenyAccess(peer_id, SERVER_ACCESSDENIED_WRONG_VERSION);
 156                 return;
 157         }
 158
 159         /*
 160                 Validate player name
 161         */
 162         const char* playername = playerName.c_str();
 163
 164         size_t pns = playerName.size();
 165         if (pns == 0 || pns > PLAYERNAME_SIZE) {
 166                 actionstream << "Server: Player with " <<
 167                         ((pns > PLAYERNAME_SIZE) ? "a too long" : "an empty") <<
 168                         " name tried to connect from " << addr_s << std::endl;
 169                 DenyAccess(peer_id, SERVER_ACCESSDENIED_WRONG_NAME);
 170                 return;
 171         }
 172
 173         if (!string_allowed(playerName, PLAYERNAME_ALLOWED_CHARS)) {
 174                 actionstream << "Server: Player with an invalid name tried to connect "
 175                         "from " << addr_s << std::endl;
 176                 DenyAccess(peer_id, SERVER_ACCESSDENIED_WRONG_CHARS_IN_NAME);
 177                 return;
 178         }
 179
 180         RemotePlayer *player = m_env->getPlayer(playername);
 181
 182         // If player is already connected, cancel
 183         if (player && player->getPeerId() != PEER_ID_INEXISTENT) {
 184                 actionstream << "Server: Player with name \"" << playername <<
 185                         "\" tried to connect, but player with same name is already connected" << std::endl;
 186                 DenyAccess(peer_id, SERVER_ACCESSDENIED_ALREADY_CONNECTED);
 187                 return;
 188         }
 189
 190         m_clients.setPlayerName(peer_id, playername);
 191         //TODO (later) case insensitivity
 192
 193         std::string legacyPlayerNameCasing = playerName;
 194
 195         if (!isSingleplayer() && strcasecmp(playername, "singleplayer") == 0) {
 196                 actionstream << "Server: Player with the name \"singleplayer\" tried "
 197                         "to connect from " << addr_s << std::endl;
 198                 DenyAccess(peer_id, SERVER_ACCESSDENIED_WRONG_NAME);
 199                 return;
 200         }
 201
 202         {
 203                 std::string reason;
 204                 if (m_script->on_prejoinplayer(playername, addr_s, &reason)) {
 205                         actionstream << "Server: Player with the name \"" << playerName <<
 206                                 "\" tried to connect from " << addr_s <<
 207                                 " but it was disallowed for the following reason: " << reason <<
 208                                 std::endl;
 209                         DenyAccess(peer_id, SERVER_ACCESSDENIED_CUSTOM_STRING, reason);
 210                         return;
 211                 }
 212         }
 213
 214         infostream << "Server: New connection: \"" << playerName << "\" from " <<
 215                 addr_s << " (peer_id=" << peer_id << ")" << std::endl;
 216
 217         // Enforce user limit.
 218         // Don't enforce for users that have some admin right or mod permits it.
 219         if (m_clients.isUserLimitReached() &&
 220                         playername != g_settings->get("name") &&
 221                         !m_script->can_bypass_userlimit(playername, addr_s)) {
 222                 actionstream << "Server: " << playername << " tried to join from " <<
 223                         addr_s << ", but there are already max_users=" <<
 224                         g_settings->getU16("max_users") << " players." << std::endl;
 225                 DenyAccess(peer_id, SERVER_ACCESSDENIED_TOO_MANY_USERS);
 226                 return;
 227         }
 228
 229         /*
 230                 Compose auth methods for answer
 231         */
 232         std::string encpwd; // encrypted Password field for the user
 233         bool has_auth = m_script->getAuth(playername, &encpwd, nullptr);
 234         u32 auth_mechs = 0;
 235
 236         client->chosen_mech = AUTH_MECHANISM_NONE;
 237
 238         if (has_auth) {
 239                 std::vector<std::string> pwd_components = str_split(encpwd, '#');
 240                 if (pwd_components.size() == 4) {
 241                         if (pwd_components[1] == "1") { // 1 means srp
 242                                 auth_mechs |= AUTH_MECHANISM_SRP;
 243                                 client->enc_pwd = encpwd;
 244                         } else {
 245                                 actionstream << "User " << playername << " tried to log in, "
 246                                         "but password field was invalid (unknown mechcode)." <<
 247                                         std::endl;
 248                                 DenyAccess(peer_id, SERVER_ACCESSDENIED_SERVER_FAIL);
 249                                 return;
 250                         }
 251                 } else if (base64_is_valid(encpwd)) {
 252                         auth_mechs |= AUTH_MECHANISM_LEGACY_PASSWORD;
 253                         client->enc_pwd = encpwd;
 254                 } else {
 255                         actionstream << "User " << playername << " tried to log in, but "
 256                                 "password field was invalid (invalid base64)." << std::endl;
 257                         DenyAccess(peer_id, SERVER_ACCESSDENIED_SERVER_FAIL);
 258                         return;
 259                 }
 260         } else {
 261                 std::string default_password = g_settings->get("default_password");
 262                 if (default_password.length() == 0) {
 263                         auth_mechs |= AUTH_MECHANISM_FIRST_SRP;
 264                 } else {
 265                         // Take care of default passwords.
 266                         client->enc_pwd = get_encoded_srp_verifier(playerName, default_password);
 267                         auth_mechs |= AUTH_MECHANISM_SRP;
 268                         // Allocate player in db, but only on successful login.
 269                         client->create_player_on_auth_success = true;
 270                 }
 271         }
 272
 273         /*
 274                 Answer with a TOCLIENT_HELLO
 275         */
 276
 277         verbosestream << "Sending TOCLIENT_HELLO with auth method field: "
 278                 << auth_mechs << std::endl;
 279
 280         NetworkPacket resp_pkt(TOCLIENT_HELLO,
 281                 1 + 4 + legacyPlayerNameCasing.size(), peer_id);
 282
 283         u16 depl_compress_mode = NETPROTO_COMPRESSION_NONE;
 284         resp_pkt << depl_serial_v << depl_compress_mode << net_proto_version
 285                 << auth_mechs << legacyPlayerNameCasing;
 286
 287         Send(&resp_pkt);
 288
 289         client->allowed_auth_mechs = auth_mechs;
 290         client->setDeployedCompressionMode(depl_compress_mode);
 291
 292         m_clients.event(peer_id, CSE_Hello);
 293 }
 294
 295 void Server::handleCommand_Init2(NetworkPacket* pkt)
 296 {
 297         session_t peer_id = pkt->getPeerId();
 298         verbosestream << "Server: Got TOSERVER_INIT2 from " << peer_id << std::endl;
 299
 300         m_clients.event(peer_id, CSE_GotInit2);
 301         u16 protocol_version = m_clients.getProtocolVersion(peer_id);
 302
 303         std::string lang;
 304         if (pkt->getSize() > 0)
 305                 *pkt >> lang;
 306
 307         /*
 308                 Send some initialization data
 309         */
 310
 311         infostream << "Server: Sending content to " << getPlayerName(peer_id) <<
 312                 std::endl;
 313
 314         // Send item definitions
 315         SendItemDef(peer_id, m_itemdef, protocol_version);
 316
 317         // Send node definitions
 318         SendNodeDef(peer_id, m_nodedef, protocol_version);
 319
 320         m_clients.event(peer_id, CSE_SetDefinitionsSent);
 321
 322         // Send media announcement
 323         sendMediaAnnouncement(peer_id, lang);
 324
 325         RemoteClient *client = getClient(peer_id, CS_InitDone);
 326
 327         // Keep client language for server translations
 328         client->setLangCode(lang);
 329
 330         // Send active objects
 331         {
 332                 PlayerSAO *sao = getPlayerSAO(peer_id);
 333                 if (sao)
 334                         SendActiveObjectRemoveAdd(client, sao);
 335         }
 336
 337         // Send detached inventories
 338         sendDetachedInventories(peer_id, false);
 339
 340         // Send player movement settings
 341         SendMovement(peer_id);
 342
 343         // Send time of day
 344         u16 time = m_env->getTimeOfDay();
 345         float time_speed = g_settings->getFloat("time_speed");
 346         SendTimeOfDay(peer_id, time, time_speed);
 347
 348         SendCSMRestrictionFlags(peer_id);
 349
 350         // Warnings about protocol version can be issued here
 351         if (client->net_proto_version < LATEST_PROTOCOL_VERSION) {
 352                 SendChatMessage(peer_id, ChatMessage(CHATMESSAGE_TYPE_SYSTEM,
 353                         L"# Server: WARNING: YOUR CLIENT'S VERSION MAY NOT BE FULLY COMPATIBLE "
 354                         L"WITH THIS SERVER!"));
 355         }
 356 }
 357
 358 void Server::handleCommand_RequestMedia(NetworkPacket* pkt)
 359 {
 360         std::vector<std::string> tosend;
 361         u16 numfiles;
 362
 363         *pkt >> numfiles;
 364
 365         session_t peer_id = pkt->getPeerId();
 366         infostream << "Sending " << numfiles << " files to " <<
 367                 getPlayerName(peer_id) << std::endl;
 368         verbosestream << "TOSERVER_REQUEST_MEDIA: requested file(s)" << std::endl;
 369
 370         for (u16 i = 0; i < numfiles; i++) {
 371                 std::string name;
 372
 373                 *pkt >> name;
 374
 375                 tosend.emplace_back(name);
 376                 verbosestream << "  " << name << std::endl;
 377         }
 378
 379         sendRequestedMedia(peer_id, tosend);
 380 }
 381
 382 void Server::handleCommand_ClientReady(NetworkPacket* pkt)
 383 {
 384         session_t peer_id = pkt->getPeerId();
 385
 386         // decode all information first
 387         u8 major_ver, minor_ver, patch_ver, reserved;
 388         u16 formspec_ver = 1; // v1 for clients older than 5.1.0-dev
 389         std::string full_ver;
 390
 391         *pkt >> major_ver >> minor_ver >> patch_ver >> reserved >> full_ver;
 392         if (pkt->getRemainingBytes() >= 2)
 393                 *pkt >> formspec_ver;
 394
 395         m_clients.setClientVersion(peer_id, major_ver, minor_ver, patch_ver,
 396                 full_ver);
 397
 398         // Emerge player
 399         PlayerSAO* playersao = StageTwoClientInit(peer_id);
 400         if (!playersao) {
 401                 errorstream << "Server: stage 2 client init failed "
 402                         "peer_id=" << peer_id << std::endl;
 403                 DisconnectPeer(peer_id);
 404                 return;
 405         }
 406
 407         playersao->getPlayer()->formspec_version = formspec_ver;
 408         m_clients.event(peer_id, CSE_SetClientReady);
 409
 410         // Send player list to this client
 411         {
 412                 const std::vector<std::string> &players = m_clients.getPlayerNames();
 413                 NetworkPacket list_pkt(TOCLIENT_UPDATE_PLAYER_LIST, 0, peer_id);
 414                 list_pkt << (u8) PLAYER_LIST_INIT << (u16) players.size();
 415                 for (const auto &player : players)
 416                         list_pkt << player;
 417                 Send(peer_id, &list_pkt);
 418         }
 419
 420         s64 last_login;
 421         m_script->getAuth(playersao->getPlayer()->getName(), nullptr, nullptr, &last_login);
 422         m_script->on_joinplayer(playersao, last_login);
 423
 424         // Send shutdown timer if shutdown has been scheduled
 425         if (m_shutdown_state.isTimerRunning())
 426                 SendChatMessage(peer_id, m_shutdown_state.getShutdownTimerMessage());
 427 }
 428
 429 void Server::handleCommand_GotBlocks(NetworkPacket* pkt)
 430 {
 431         if (pkt->getSize() < 1)
 432                 return;
 433
 434         /*
 435                 [0] u16 command
 436                 [2] u8 count
 437                 [3] v3s16 pos_0
 438                 [3+6] v3s16 pos_1
 439                 ...
 440         */
 441
 442         u8 count;
 443         *pkt >> count;
 444
 445         if ((s16)pkt->getSize() < 1 + (int)count * 6) {
 446                 throw con::InvalidIncomingDataException
 447                                 ("GOTBLOCKS length is too short");
 448         }
 449
 450         ClientInterface::AutoLock lock(m_clients);
 451         RemoteClient *client = m_clients.lockedGetClientNoEx(pkt->getPeerId());
 452
 453         for (u16 i = 0; i < count; i++) {
 454                 v3s16 p;
 455                 *pkt >> p;
 456                 client->GotBlock(p);
 457         }
 458 }
 459
 460 void Server::process_PlayerPos(RemotePlayer *player, PlayerSAO *playersao,
 461         NetworkPacket *pkt)
 462 {
 463         if (pkt->getRemainingBytes() < 12 + 12 + 4 + 4 + 4 + 1 + 1)
 464                 return;
 465
 466         v3s32 ps, ss;
 467         s32 f32pitch, f32yaw;
 468         u8 f32fov;
 469
 470         *pkt >> ps;
 471         *pkt >> ss;
 472         *pkt >> f32pitch;
 473         *pkt >> f32yaw;
 474
 475         f32 pitch = (f32)f32pitch / 100.0f;
 476         f32 yaw = (f32)f32yaw / 100.0f;
 477         u32 keyPressed = 0;
 478
 479         f32 fov = 0;
 480         u8 wanted_range = 0;
 481
 482         *pkt >> keyPressed;
 483         *pkt >> f32fov;
 484         fov = (f32)f32fov / 80.0f;
 485         *pkt >> wanted_range;
 486
 487         v3f position((f32)ps.X / 100.0f, (f32)ps.Y / 100.0f, (f32)ps.Z / 100.0f);
 488         v3f speed((f32)ss.X / 100.0f, (f32)ss.Y / 100.0f, (f32)ss.Z / 100.0f);
 489
 490         pitch = modulo360f(pitch);
 491         yaw = wrapDegrees_0_360(yaw);
 492
 493         if (!playersao->isAttached()) {
 494                 // Only update player positions when moving freely
 495                 // to not interfere with attachment handling
 496                 playersao->setBasePosition(position);
 497                 player->setSpeed(speed);
 498         }
 499         playersao->setLookPitch(pitch);
 500         playersao->setPlayerYaw(yaw);
 501         playersao->setFov(fov);
 502         playersao->setWantedRange(wanted_range);
 503
 504         player->control.unpackKeysPressed(keyPressed);
 505
 506         if (playersao->checkMovementCheat()) {
 507                 // Call callbacks
 508                 m_script->on_cheat(playersao, "moved_too_fast");
 509                 SendMovePlayer(pkt->getPeerId());
 510         }
 511 }
 512
 513 void Server::handleCommand_PlayerPos(NetworkPacket* pkt)
 514 {
 515         session_t peer_id = pkt->getPeerId();
 516         RemotePlayer *player = m_env->getPlayer(peer_id);
 517         if (player == NULL) {
 518                 errorstream <<
 519                         "Server::ProcessData(): Canceling: No player for peer_id=" <<
 520                         peer_id << " disconnecting peer!" << std::endl;
 521                 DisconnectPeer(peer_id);
 522                 return;
 523         }
 524
 525         PlayerSAO *playersao = player->getPlayerSAO();
 526         if (playersao == NULL) {
 527                 errorstream <<
 528                         "Server::ProcessData(): Canceling: No player object for peer_id=" <<
 529                         peer_id << " disconnecting peer!" << std::endl;
 530                 DisconnectPeer(peer_id);
 531                 return;
 532         }
 533
 534         // If player is dead we don't care of this packet
 535         if (playersao->isDead()) {
 536                 verbosestream << "TOSERVER_PLAYERPOS: " << player->getName()
 537                                 << " is dead. Ignoring packet";
 538                 return;
 539         }
 540
 541         process_PlayerPos(player, playersao, pkt);
 542 }
 543
 544 void Server::handleCommand_DeletedBlocks(NetworkPacket* pkt)
 545 {
 546         if (pkt->getSize() < 1)
 547                 return;
 548
 549         /*
 550                 [0] u16 command
 551                 [2] u8 count
 552                 [3] v3s16 pos_0
 553                 [3+6] v3s16 pos_1
 554                 ...
 555         */
 556
 557         u8 count;
 558         *pkt >> count;
 559
 560         RemoteClient *client = getClient(pkt->getPeerId());
 561
 562         if ((s16)pkt->getSize() < 1 + (int)count * 6) {
 563                 throw con::InvalidIncomingDataException
 564                                 ("DELETEDBLOCKS length is too short");
 565         }
 566
 567         for (u16 i = 0; i < count; i++) {
 568                 v3s16 p;
 569                 *pkt >> p;
 570                 client->SetBlockNotSent(p);
 571         }
 572 }
 573
 574 void Server::handleCommand_InventoryAction(NetworkPacket* pkt)
 575 {
 576         session_t peer_id = pkt->getPeerId();
 577         RemotePlayer *player = m_env->getPlayer(peer_id);
 578
 579         if (player == NULL) {
 580                 errorstream <<
 581                         "Server::ProcessData(): Canceling: No player for peer_id=" <<
 582                         peer_id << " disconnecting peer!" << std::endl;
 583                 DisconnectPeer(peer_id);
 584                 return;
 585         }
 586
 587         PlayerSAO *playersao = player->getPlayerSAO();
 588         if (playersao == NULL) {
 589                 errorstream <<
 590                         "Server::ProcessData(): Canceling: No player object for peer_id=" <<
 591                         peer_id << " disconnecting peer!" << std::endl;
 592                 DisconnectPeer(peer_id);
 593                 return;
 594         }
 595
 596         // Strip command and create a stream
 597         std::string datastring(pkt->getString(0), pkt->getSize());
 598         verbosestream << "TOSERVER_INVENTORY_ACTION: data=" << datastring
 599                 << std::endl;
 600         std::istringstream is(datastring, std::ios_base::binary);
 601         // Create an action
 602         std::unique_ptr<InventoryAction> a(InventoryAction::deSerialize(is));
 603         if (!a) {
 604                 infostream << "TOSERVER_INVENTORY_ACTION: "
 605                                 << "InventoryAction::deSerialize() returned NULL"
 606                                 << std::endl;
 607                 return;
 608         }
 609
 610         // If something goes wrong, this player is to blame
 611         RollbackScopeActor rollback_scope(m_rollback,
 612                         std::string("player:")+player->getName());
 613
 614         /*
 615                 Note: Always set inventory not sent, to repair cases
 616                 where the client made a bad prediction.
 617         */
 618
 619         const bool player_has_interact = checkPriv(player->getName(), "interact");
 620
 621         auto check_inv_access = [player, player_has_interact, this] (
 622                         const InventoryLocation &loc) -> bool {
 623
 624                 // Players without interact may modify their own inventory
 625                 if (!player_has_interact && loc.type != InventoryLocation::PLAYER) {
 626                         infostream << "Cannot modify foreign inventory: "
 627                                         << "No interact privilege" << std::endl;
 628                         return false;
 629                 }
 630
 631                 switch (loc.type) {
 632                 case InventoryLocation::CURRENT_PLAYER:
 633                         // Only used internally on the client, never sent
 634                         return false;
 635                 case InventoryLocation::PLAYER:
 636                         // Allow access to own inventory in all cases
 637                         return loc.name == player->getName();
 638                 case InventoryLocation::NODEMETA:
 639                         {
 640                                 // Check for out-of-range interaction
 641                                 v3f node_pos   = intToFloat(loc.p, BS);
 642                                 v3f player_pos = player->getPlayerSAO()->getEyePosition();
 643                                 f32 d = player_pos.getDistanceFrom(node_pos);
 644                                 return checkInteractDistance(player, d, "inventory");
 645                         }
 646                 case InventoryLocation::DETACHED:
 647                         return getInventoryMgr()->checkDetachedInventoryAccess(loc, player->getName());
 648                 default:
 649                         return false;
 650                 }
 651         };
 652
 653         /*
 654                 Handle restrictions and special cases of the move action
 655         */
 656         if (a->getType() == IAction::Move) {
 657                 IMoveAction *ma = (IMoveAction*)a.get();
 658
 659                 ma->from_inv.applyCurrentPlayer(player->getName());
 660                 ma->to_inv.applyCurrentPlayer(player->getName());
 661
 662                 m_inventory_mgr->setInventoryModified(ma->from_inv);
 663                 if (ma->from_inv != ma->to_inv)
 664                         m_inventory_mgr->setInventoryModified(ma->to_inv);
 665
 666                 if (!check_inv_access(ma->from_inv) ||
 667                                 !check_inv_access(ma->to_inv))
 668                         return;
 669
 670                 /*
 671                         Disable moving items out of craftpreview
 672                 */
 673                 if (ma->from_list == "craftpreview") {
 674                         infostream << "Ignoring IMoveAction from "
 675                                         << (ma->from_inv.dump()) << ":" << ma->from_list
 676                                         << " to " << (ma->to_inv.dump()) << ":" << ma->to_list
 677                                         << " because src is " << ma->from_list << std::endl;
 678                         return;
 679                 }
 680
 681                 /*
 682                         Disable moving items into craftresult and craftpreview
 683                 */
 684                 if (ma->to_list == "craftpreview" || ma->to_list == "craftresult") {
 685                         infostream << "Ignoring IMoveAction from "
 686                                         << (ma->from_inv.dump()) << ":" << ma->from_list
 687                                         << " to " << (ma->to_inv.dump()) << ":" << ma->to_list
 688                                         << " because dst is " << ma->to_list << std::endl;
 689                         return;
 690                 }
 691         }
 692         /*
 693                 Handle restrictions and special cases of the drop action
 694         */
 695         else if (a->getType() == IAction::Drop) {
 696                 IDropAction *da = (IDropAction*)a.get();
 697
 698                 da->from_inv.applyCurrentPlayer(player->getName());
 699
 700                 m_inventory_mgr->setInventoryModified(da->from_inv);
 701
 702                 /*
 703                         Disable dropping items out of craftpreview
 704                 */
 705                 if (da->from_list == "craftpreview") {
 706                         infostream << "Ignoring IDropAction from "
 707                                         << (da->from_inv.dump()) << ":" << da->from_list
 708                                         << " because src is " << da->from_list << std::endl;
 709                         return;
 710                 }
 711
 712                 // Disallow dropping items if not allowed to interact
 713                 if (!player_has_interact || !check_inv_access(da->from_inv))
 714                         return;
 715
 716                 // Disallow dropping items if dead
 717                 if (playersao->isDead()) {
 718                         infostream << "Ignoring IDropAction from "
 719                                         << (da->from_inv.dump()) << ":" << da->from_list
 720                                         << " because player is dead." << std::endl;
 721                         return;
 722                 }
 723         }
 724         /*
 725                 Handle restrictions and special cases of the craft action
 726         */
 727         else if (a->getType() == IAction::Craft) {
 728                 ICraftAction *ca = (ICraftAction*)a.get();
 729
 730                 ca->craft_inv.applyCurrentPlayer(player->getName());
 731
 732                 m_inventory_mgr->setInventoryModified(ca->craft_inv);
 733
 734                 // Disallow crafting if not allowed to interact
 735                 if (!player_has_interact) {
 736                         infostream << "Cannot craft: "
 737                                         << "No interact privilege" << std::endl;
 738                         return;
 739                 }
 740
 741                 if (!check_inv_access(ca->craft_inv))
 742                         return;
 743         } else {
 744                 // Unknown action. Ignored.
 745                 return;
 746         }
 747
 748         // Do the action
 749         a->apply(m_inventory_mgr.get(), playersao, this);
 750 }
 751
 752 void Server::handleCommand_ChatMessage(NetworkPacket* pkt)
 753 {
 754         std::wstring message;
 755         *pkt >> message;
 756
 757         session_t peer_id = pkt->getPeerId();
 758         RemotePlayer *player = m_env->getPlayer(peer_id);
 759         if (player == NULL) {
 760                 errorstream <<
 761                         "Server::ProcessData(): Canceling: No player for peer_id=" <<
 762                         peer_id << " disconnecting peer!" << std::endl;
 763                 DisconnectPeer(peer_id);
 764                 return;
 765         }
 766
 767         std::string name = player->getName();
 768
 769         std::wstring answer_to_sender = handleChat(name, message, true, player);
 770         if (!answer_to_sender.empty()) {
 771                 // Send the answer to sender
 772                 SendChatMessage(peer_id, ChatMessage(CHATMESSAGE_TYPE_SYSTEM,
 773                         answer_to_sender));
 774         }
 775 }
 776
 777 void Server::handleCommand_Damage(NetworkPacket* pkt)
 778 {
 779         u16 damage;
 780
 781         *pkt >> damage;
 782
 783         session_t peer_id = pkt->getPeerId();
 784         RemotePlayer *player = m_env->getPlayer(peer_id);
 785
 786         if (player == NULL) {
 787                 errorstream <<
 788                         "Server::ProcessData(): Canceling: No player for peer_id=" <<
 789                         peer_id << " disconnecting peer!" << std::endl;
 790                 DisconnectPeer(peer_id);
 791                 return;
 792         }
 793
 794         PlayerSAO *playersao = player->getPlayerSAO();
 795         if (playersao == NULL) {
 796                 errorstream <<
 797                         "Server::ProcessData(): Canceling: No player object for peer_id=" <<
 798                         peer_id << " disconnecting peer!" << std::endl;
 799                 DisconnectPeer(peer_id);
 800                 return;
 801         }
 802
 803         if (!playersao->isImmortal()) {
 804                 if (playersao->isDead()) {
 805                         verbosestream << "Server::ProcessData(): Info: "
 806                                 "Ignoring damage as player " << player->getName()
 807                                 << " is already dead." << std::endl;
 808                         return;
 809                 }
 810
 811                 actionstream << player->getName() << " damaged by "
 812                                 << (int)damage << " hp at " << PP(playersao->getBasePosition() / BS)
 813                                 << std::endl;
 814
 815                 PlayerHPChangeReason reason(PlayerHPChangeReason::FALL);
 816                 playersao->setHP((s32)playersao->getHP() - (s32)damage, reason, true);
 817         }
 818 }
 819
 820 void Server::handleCommand_PlayerItem(NetworkPacket* pkt)
 821 {
 822         if (pkt->getSize() < 2)
 823                 return;
 824
 825         session_t peer_id = pkt->getPeerId();
 826         RemotePlayer *player = m_env->getPlayer(peer_id);
 827
 828         if (player == NULL) {
 829                 errorstream <<
 830                         "Server::ProcessData(): Canceling: No player for peer_id=" <<
 831                         peer_id << " disconnecting peer!" << std::endl;
 832                 DisconnectPeer(peer_id);
 833                 return;
 834         }
 835
 836         PlayerSAO *playersao = player->getPlayerSAO();
 837         if (playersao == NULL) {
 838                 errorstream <<
 839                         "Server::ProcessData(): Canceling: No player object for peer_id=" <<
 840                         peer_id << " disconnecting peer!" << std::endl;
 841                 DisconnectPeer(peer_id);
 842                 return;
 843         }
 844
 845         u16 item;
 846
 847         *pkt >> item;
 848
 849         if (item >= player->getHotbarItemcount()) {
 850                 actionstream << "Player: " << player->getName()
 851                         << " tried to access item=" << item
 852                         << " out of hotbar_itemcount="
 853                         << player->getHotbarItemcount()
 854                         << "; ignoring." << std::endl;
 855                 return;
 856         }
 857
 858         playersao->getPlayer()->setWieldIndex(item);
 859 }
 860
 861 void Server::handleCommand_Respawn(NetworkPacket* pkt)
 862 {
 863         session_t peer_id = pkt->getPeerId();
 864         RemotePlayer *player = m_env->getPlayer(peer_id);
 865         if (player == NULL) {
 866                 errorstream <<
 867                         "Server::ProcessData(): Canceling: No player for peer_id=" <<
 868                         peer_id << " disconnecting peer!" << std::endl;
 869                 DisconnectPeer(peer_id);
 870                 return;
 871         }
 872
 873         PlayerSAO *playersao = player->getPlayerSAO();
 874         assert(playersao);
 875
 876         if (!playersao->isDead())
 877                 return;
 878
 879         RespawnPlayer(peer_id);
 880
 881         actionstream << player->getName() << " respawns at "
 882                         << PP(playersao->getBasePosition() / BS) << std::endl;
 883
 884         // ActiveObject is added to environment in AsyncRunStep after
 885         // the previous addition has been successfully removed
 886 }
 887
 888 bool Server::checkInteractDistance(RemotePlayer *player, const f32 d, const std::string &what)
 889 {
 890         ItemStack selected_item, hand_item;
 891         player->getWieldedItem(&selected_item, &hand_item);
 892         f32 max_d = BS * getToolRange(selected_item.getDefinition(m_itemdef),
 893                         hand_item.getDefinition(m_itemdef));
 894
 895         // Cube diagonal * 1.5 for maximal supported node extents:
 896         // sqrt(3) * 1.5 ≅ 2.6
 897         if (d > max_d + 2.6f * BS) {
 898                 actionstream << "Player " << player->getName()
 899                                 << " tried to access " << what
 900                                 << " from too far: "
 901                                 << "d=" << d << ", max_d=" << max_d
 902                                 << "; ignoring." << std::endl;
 903                 // Call callbacks
 904                 m_script->on_cheat(player->getPlayerSAO(), "interacted_too_far");
 905                 return false;
 906         }
 907         return true;
 908 }
 909
 910 // Tiny helper to retrieve the selected item into an Optional
 911 static inline void getWieldedItem(const PlayerSAO *playersao, Optional<ItemStack> &ret)
 912 {
 913         ret = ItemStack();
 914         playersao->getWieldedItem(&(*ret));
 915 }
 916
 917 void Server::handleCommand_Interact(NetworkPacket *pkt)
 918 {
 919         /*
 920                 [0] u16 command
 921                 [2] u8 action
 922                 [3] u16 item
 923                 [5] u32 length of the next item (plen)
 924                 [9] serialized PointedThing
 925                 [9 + plen] player position information
 926         */
 927
 928         InteractAction action;
 929         u16 item_i;
 930
 931         *pkt >> (u8 &)action;
 932         *pkt >> item_i;
 933
 934         std::istringstream tmp_is(pkt->readLongString(), std::ios::binary);
 935         PointedThing pointed;
 936         pointed.deSerialize(tmp_is);
 937
 938         verbosestream << "TOSERVER_INTERACT: action=" << (int)action << ", item="
 939                         << item_i << ", pointed=" << pointed.dump() << std::endl;
 940
 941         session_t peer_id = pkt->getPeerId();
 942         RemotePlayer *player = m_env->getPlayer(peer_id);
 943
 944         if (player == NULL) {
 945                 errorstream <<
 946                         "Server::ProcessData(): Canceling: No player for peer_id=" <<
 947                         peer_id << " disconnecting peer!" << std::endl;
 948                 DisconnectPeer(peer_id);
 949                 return;
 950         }
 951
 952         PlayerSAO *playersao = player->getPlayerSAO();
 953         if (playersao == NULL) {
 954                 errorstream <<
 955                         "Server::ProcessData(): Canceling: No player object for peer_id=" <<
 956                         peer_id << " disconnecting peer!" << std::endl;
 957                 DisconnectPeer(peer_id);
 958                 return;
 959         }
 960
 961         if (playersao->isDead()) {
 962                 actionstream << "Server: " << player->getName()
 963                                 << " tried to interact while dead; ignoring." << std::endl;
 964                 if (pointed.type == POINTEDTHING_NODE) {
 965                         // Re-send block to revert change on client-side
 966                         RemoteClient *client = getClient(peer_id);
 967                         v3s16 blockpos = getNodeBlockPos(pointed.node_undersurface);
 968                         client->SetBlockNotSent(blockpos);
 969                 }
 970                 // Call callbacks
 971                 m_script->on_cheat(playersao, "interacted_while_dead");
 972                 return;
 973         }
 974
 975         process_PlayerPos(player, playersao, pkt);
 976
 977         v3f player_pos = playersao->getLastGoodPosition();
 978
 979         // Update wielded item
 980
 981         if (item_i >= player->getHotbarItemcount()) {
 982                 actionstream << "Player: " << player->getName()
 983                         << " tried to access item=" << item_i
 984                         << " out of hotbar_itemcount="
 985                         << player->getHotbarItemcount()
 986                         << "; ignoring." << std::endl;
 987                 return;
 988         }
 989
 990         playersao->getPlayer()->setWieldIndex(item_i);
 991
 992         // Get pointed to object (NULL if not POINTEDTYPE_OBJECT)
 993         ServerActiveObject *pointed_object = NULL;
 994         if (pointed.type == POINTEDTHING_OBJECT) {
 995                 pointed_object = m_env->getActiveObject(pointed.object_id);
 996                 if (pointed_object == NULL) {
 997                         verbosestream << "TOSERVER_INTERACT: "
 998                                 "pointed object is NULL" << std::endl;
 999                         return;
1000                 }
1001
1002         }
1003
1004         /*
1005                 Make sure the player is allowed to do it
1006         */
1007         if (!checkPriv(player->getName(), "interact")) {
1008                 actionstream << player->getName() << " attempted to interact with " <<
1009                                 pointed.dump() << " without 'interact' privilege" << std::endl;
1010
1011                 if (pointed.type != POINTEDTHING_NODE)
1012                         return;
1013
1014                 // Re-send block to revert change on client-side
1015                 RemoteClient *client = getClient(peer_id);
1016                 // Digging completed -> under
1017                 if (action == INTERACT_DIGGING_COMPLETED) {
1018                         v3s16 blockpos = getNodeBlockPos(pointed.node_undersurface);
1019                         client->SetBlockNotSent(blockpos);
1020                 }
1021                 // Placement -> above
1022                 else if (action == INTERACT_PLACE) {
1023                         v3s16 blockpos = getNodeBlockPos(pointed.node_abovesurface);
1024                         client->SetBlockNotSent(blockpos);
1025                 }
1026                 return;
1027         }
1028
1029         /*
1030                 Check that target is reasonably close
1031         */
1032         static thread_local const bool enable_anticheat =
1033                         !g_settings->getBool("disable_anticheat");
1034
1035         if ((action == INTERACT_START_DIGGING || action == INTERACT_DIGGING_COMPLETED ||
1036                         action == INTERACT_PLACE || action == INTERACT_USE) &&
1037                         enable_anticheat && !isSingleplayer()) {
1038                 v3f target_pos = player_pos;
1039                 if (pointed.type == POINTEDTHING_NODE) {
1040                         target_pos = intToFloat(pointed.node_undersurface, BS);
1041                 } else if (pointed.type == POINTEDTHING_OBJECT) {
1042                         if (playersao->getId() == pointed_object->getId()) {
1043                                 actionstream << "Server: " << player->getName()
1044                                         << " attempted to interact with themselves" << std::endl;
1045                                 m_script->on_cheat(playersao, "interacted_with_self");
1046                                 return;
1047                         }
1048                         target_pos = pointed_object->getBasePosition();
1049                 }
1050                 float d = playersao->getEyePosition().getDistanceFrom(target_pos);
1051
1052                 if (!checkInteractDistance(player, d, pointed.dump())) {
1053                         if (pointed.type == POINTEDTHING_NODE) {
1054                                 // Re-send block to revert change on client-side
1055                                 RemoteClient *client = getClient(peer_id);
1056                                 v3s16 blockpos = getNodeBlockPos(pointed.node_undersurface);
1057                                 client->SetBlockNotSent(blockpos);
1058                         }
1059                         return;
1060                 }
1061         }
1062
1063         /*
1064                 If something goes wrong, this player is to blame
1065         */
1066         RollbackScopeActor rollback_scope(m_rollback,
1067                         std::string("player:")+player->getName());
1068
1069         switch (action) {
1070         // Start digging or punch object
1071         case INTERACT_START_DIGGING: {
1072                 if (pointed.type == POINTEDTHING_NODE) {
1073                         MapNode n(CONTENT_IGNORE);
1074                         bool pos_ok;
1075
1076                         v3s16 p_under = pointed.node_undersurface;
1077                         n = m_env->getMap().getNode(p_under, &pos_ok);
1078                         if (!pos_ok) {
1079                                 infostream << "Server: Not punching: Node not found. "
1080                                         "Adding block to emerge queue." << std::endl;
1081                                 m_emerge->enqueueBlockEmerge(peer_id,
1082                                         getNodeBlockPos(pointed.node_abovesurface), false);
1083                         }
1084
1085                         if (n.getContent() != CONTENT_IGNORE)
1086                                 m_script->node_on_punch(p_under, n, playersao, pointed);
1087
1088                         // Cheat prevention
1089                         playersao->noCheatDigStart(p_under);
1090
1091                         return;
1092                 }
1093
1094                 // Skip if the object can't be interacted with anymore
1095                 if (pointed.type != POINTEDTHING_OBJECT || pointed_object->isGone())
1096                         return;
1097
1098                 ItemStack selected_item, hand_item;
1099                 ItemStack tool_item = playersao->getWieldedItem(&selected_item, &hand_item);
1100                 ToolCapabilities toolcap =
1101                                 tool_item.getToolCapabilities(m_itemdef);
1102                 v3f dir = (pointed_object->getBasePosition() -
1103                                 (playersao->getBasePosition() + playersao->getEyeOffset())
1104                                         ).normalize();
1105                 float time_from_last_punch =
1106                         playersao->resetTimeFromLastPunch();
1107
1108                 u32 wear = pointed_object->punch(dir, &toolcap, playersao,
1109                                 time_from_last_punch, tool_item.wear);
1110
1111                 // Callback may have changed item, so get it again
1112                 playersao->getWieldedItem(&selected_item);
1113                 bool changed = selected_item.addWear(wear, m_itemdef);
1114                 if (changed)
1115                         playersao->setWieldedItem(selected_item);
1116
1117                 return;
1118         } // action == INTERACT_START_DIGGING
1119
1120         case INTERACT_STOP_DIGGING:
1121                 // Nothing to do
1122                 return;
1123
1124         case INTERACT_DIGGING_COMPLETED: {
1125                 // Only digging of nodes
1126                 if (pointed.type != POINTEDTHING_NODE)
1127                         return;
1128                 bool pos_ok;
1129                 v3s16 p_under = pointed.node_undersurface;
1130                 MapNode n = m_env->getMap().getNode(p_under, &pos_ok);
1131                 if (!pos_ok) {
1132                         infostream << "Server: Not finishing digging: Node not found. "
1133                                 "Adding block to emerge queue." << std::endl;
1134                         m_emerge->enqueueBlockEmerge(peer_id,
1135                                 getNodeBlockPos(pointed.node_abovesurface), false);
1136                 }
1137
1138                 /* Cheat prevention */
1139                 bool is_valid_dig = true;
1140                 if (enable_anticheat && !isSingleplayer()) {
1141                         v3s16 nocheat_p = playersao->getNoCheatDigPos();
1142                         float nocheat_t = playersao->getNoCheatDigTime();
1143                         playersao->noCheatDigEnd();
1144                         // If player didn't start digging this, ignore dig
1145                         if (nocheat_p != p_under) {
1146                                 infostream << "Server: " << player->getName()
1147                                                 << " started digging "
1148                                                 << PP(nocheat_p) << " and completed digging "
1149                                                 << PP(p_under) << "; not digging." << std::endl;
1150                                 is_valid_dig = false;
1151                                 // Call callbacks
1152                                 m_script->on_cheat(playersao, "finished_unknown_dig");
1153                         }
1154
1155                         // Get player's wielded item
1156                         // See also: Game::handleDigging
1157                         ItemStack selected_item, hand_item;
1158                         playersao->getPlayer()->getWieldedItem(&selected_item, &hand_item);
1159
1160                         // Get diggability and expected digging time
1161                         DigParams params = getDigParams(m_nodedef->get(n).groups,
1162                                         &selected_item.getToolCapabilities(m_itemdef),
1163                                         selected_item.wear);
1164                         // If can't dig, try hand
1165                         if (!params.diggable) {
1166                                 params = getDigParams(m_nodedef->get(n).groups,
1167                                         &hand_item.getToolCapabilities(m_itemdef));
1168                         }
1169                         // If can't dig, ignore dig
1170                         if (!params.diggable) {
1171                                 infostream << "Server: " << player->getName()
1172                                                 << " completed digging " << PP(p_under)
1173                                                 << ", which is not diggable with tool; not digging."
1174                                                 << std::endl;
1175                                 is_valid_dig = false;
1176                                 // Call callbacks
1177                                 m_script->on_cheat(playersao, "dug_unbreakable");
1178                         }
1179                         // Check digging time
1180                         // If already invalidated, we don't have to
1181                         if (!is_valid_dig) {
1182                                 // Well not our problem then
1183                         }
1184                         // Clean and long dig
1185                         else if (params.time > 2.0 && nocheat_t * 1.2 > params.time) {
1186                                 // All is good, but grab time from pool; don't care if
1187                                 // it's actually available
1188                                 playersao->getDigPool().grab(params.time);
1189                         }
1190                         // Short or laggy dig
1191                         // Try getting the time from pool
1192                         else if (playersao->getDigPool().grab(params.time)) {
1193                                 // All is good
1194                         }
1195                         // Dig not possible
1196                         else {
1197                                 infostream << "Server: " << player->getName()
1198                                                 << " completed digging " << PP(p_under)
1199                                                 << "too fast; not digging." << std::endl;
1200                                 is_valid_dig = false;
1201                                 // Call callbacks
1202                                 m_script->on_cheat(playersao, "dug_too_fast");
1203                         }
1204                 }
1205
1206                 /* Actually dig node */
1207
1208                 if (is_valid_dig && n.getContent() != CONTENT_IGNORE)
1209                         m_script->node_on_dig(p_under, n, playersao);
1210
1211                 v3s16 blockpos = getNodeBlockPos(p_under);
1212                 RemoteClient *client = getClient(peer_id);
1213                 // Send unusual result (that is, node not being removed)
1214                 if (m_env->getMap().getNode(p_under).getContent() != CONTENT_AIR)
1215                         // Re-send block to revert change on client-side
1216                         client->SetBlockNotSent(blockpos);
1217                 else
1218                         client->ResendBlockIfOnWire(blockpos);
1219
1220                 return;
1221         } // action == INTERACT_DIGGING_COMPLETED
1222
1223         // Place block or right-click object
1224         case INTERACT_PLACE: {
1225                 Optional<ItemStack> selected_item;
1226                 getWieldedItem(playersao, selected_item);
1227
1228                 // Reset build time counter
1229                 if (pointed.type == POINTEDTHING_NODE &&
1230                                 selected_item->getDefinition(m_itemdef).type == ITEM_NODE)
1231                         getClient(peer_id)->m_time_from_building = 0.0;
1232
1233                 const bool had_prediction = !selected_item->getDefinition(m_itemdef).
1234                         node_placement_prediction.empty();
1235
1236                 if (pointed.type == POINTEDTHING_OBJECT) {
1237                         // Right click object
1238
1239                         // Skip if object can't be interacted with anymore
1240                         if (pointed_object->isGone())
1241                                 return;
1242
1243                         actionstream << player->getName() << " right-clicks object "
1244                                         << pointed.object_id << ": "
1245                                         << pointed_object->getDescription() << std::endl;
1246
1247                         // Do stuff
1248                         if (m_script->item_OnSecondaryUse(selected_item, playersao, pointed)) {
1249                                 if (selected_item.has_value() && playersao->setWieldedItem(*selected_item))
1250                                         SendInventory(playersao, true);
1251                         }
1252
1253                         pointed_object->rightClick(playersao);
1254                 } else if (m_script->item_OnPlace(selected_item, playersao, pointed)) {
1255                         // Placement was handled in lua
1256
1257                         // Apply returned ItemStack
1258                         if (selected_item.has_value() && playersao->setWieldedItem(*selected_item))
1259                                 SendInventory(playersao, true);
1260                 }
1261
1262                 if (pointed.type != POINTEDTHING_NODE)
1263                         return;
1264
1265                 // If item has node placement prediction, always send the
1266                 // blocks to make sure the client knows what exactly happened
1267                 RemoteClient *client = getClient(peer_id);
1268                 v3s16 blockpos = getNodeBlockPos(pointed.node_abovesurface);
1269                 v3s16 blockpos2 = getNodeBlockPos(pointed.node_undersurface);
1270                 if (had_prediction) {
1271                         client->SetBlockNotSent(blockpos);
1272                         if (blockpos2 != blockpos)
1273                                 client->SetBlockNotSent(blockpos2);
1274                 } else {
1275                         client->ResendBlockIfOnWire(blockpos);
1276                         if (blockpos2 != blockpos)
1277                                 client->ResendBlockIfOnWire(blockpos2);
1278                 }
1279
1280                 return;
1281         } // action == INTERACT_PLACE
1282
1283         case INTERACT_USE: {
1284                 Optional<ItemStack> selected_item;
1285                 getWieldedItem(playersao, selected_item);
1286
1287                 actionstream << player->getName() << " uses " << selected_item->name
1288                                 << ", pointing at " << pointed.dump() << std::endl;
1289
1290                 if (m_script->item_OnUse(selected_item, playersao, pointed)) {
1291                         // Apply returned ItemStack
1292                         if (selected_item.has_value() && playersao->setWieldedItem(*selected_item))
1293                                 SendInventory(playersao, true);
1294                 }
1295
1296                 return;
1297         }
1298
1299         // Rightclick air
1300         case INTERACT_ACTIVATE: {
1301                 Optional<ItemStack> selected_item;
1302                 getWieldedItem(playersao, selected_item);
1303
1304                 actionstream << player->getName() << " activates "
1305                                 << selected_item->name << std::endl;
1306
1307                 pointed.type = POINTEDTHING_NOTHING; // can only ever be NOTHING
1308
1309                 if (m_script->item_OnSecondaryUse(selected_item, playersao, pointed)) {
1310                         // Apply returned ItemStack
1311                         if (selected_item.has_value() && playersao->setWieldedItem(*selected_item))
1312                                 SendInventory(playersao, true);
1313                 }
1314
1315                 return;
1316         }
1317
1318         default:
1319                 warningstream << "Server: Invalid action " << action << std::endl;
1320
1321         }
1322 }
1323
1324 void Server::handleCommand_RemovedSounds(NetworkPacket* pkt)
1325 {
1326         u16 num;
1327         *pkt >> num;
1328         for (u16 k = 0; k < num; k++) {
1329                 s32 id;
1330
1331                 *pkt >> id;
1332
1333                 std::unordered_map<s32, ServerPlayingSound>::iterator i =
1334                         m_playing_sounds.find(id);
1335                 if (i == m_playing_sounds.end())
1336                         continue;
1337
1338                 ServerPlayingSound &psound = i->second;
1339                 psound.clients.erase(pkt->getPeerId());
1340                 if (psound.clients.empty())
1341                         m_playing_sounds.erase(i++);
1342         }
1343 }
1344
1345 void Server::handleCommand_NodeMetaFields(NetworkPacket* pkt)
1346 {
1347         v3s16 p;
1348         std::string formname;
1349         u16 num;
1350
1351         *pkt >> p >> formname >> num;
1352
1353         StringMap fields;
1354         for (u16 k = 0; k < num; k++) {
1355                 std::string fieldname;
1356                 *pkt >> fieldname;
1357                 fields[fieldname] = pkt->readLongString();
1358         }
1359
1360         session_t peer_id = pkt->getPeerId();
1361         RemotePlayer *player = m_env->getPlayer(peer_id);
1362
1363         if (player == NULL) {
1364                 errorstream <<
1365                         "Server::ProcessData(): Canceling: No player for peer_id=" <<
1366                         peer_id << " disconnecting peer!" << std::endl;
1367                 DisconnectPeer(peer_id);
1368                 return;
1369         }
1370
1371         PlayerSAO *playersao = player->getPlayerSAO();
1372         if (playersao == NULL) {
1373                 errorstream <<
1374                         "Server::ProcessData(): Canceling: No player object for peer_id=" <<
1375                         peer_id << " disconnecting peer!" << std::endl;
1376                 DisconnectPeer(peer_id);
1377                 return;
1378         }
1379
1380         // If something goes wrong, this player is to blame
1381         RollbackScopeActor rollback_scope(m_rollback,
1382                         std::string("player:")+player->getName());
1383
1384         // Check the target node for rollback data; leave others unnoticed
1385         RollbackNode rn_old(&m_env->getMap(), p, this);
1386
1387         m_script->node_on_receive_fields(p, formname, fields, playersao);
1388
1389         // Report rollback data
1390         RollbackNode rn_new(&m_env->getMap(), p, this);
1391         if (rollback() && rn_new != rn_old) {
1392                 RollbackAction action;
1393                 action.setSetNode(p, rn_old, rn_new);
1394                 rollback()->reportAction(action);
1395         }
1396 }
1397
1398 void Server::handleCommand_InventoryFields(NetworkPacket* pkt)
1399 {
1400         std::string client_formspec_name;
1401         u16 num;
1402
1403         *pkt >> client_formspec_name >> num;
1404
1405         StringMap fields;
1406         for (u16 k = 0; k < num; k++) {
1407                 std::string fieldname;
1408                 *pkt >> fieldname;
1409                 fields[fieldname] = pkt->readLongString();
1410         }
1411
1412         session_t peer_id = pkt->getPeerId();
1413         RemotePlayer *player = m_env->getPlayer(peer_id);
1414
1415         if (player == NULL) {
1416                 errorstream <<
1417                         "Server::ProcessData(): Canceling: No player for peer_id=" <<
1418                         peer_id << " disconnecting peer!" << std::endl;
1419                 DisconnectPeer(peer_id);
1420                 return;
1421         }
1422
1423         PlayerSAO *playersao = player->getPlayerSAO();
1424         if (playersao == NULL) {
1425                 errorstream <<
1426                         "Server::ProcessData(): Canceling: No player object for peer_id=" <<
1427                         peer_id << " disconnecting peer!" << std::endl;
1428                 DisconnectPeer(peer_id);
1429                 return;
1430         }
1431
1432         if (client_formspec_name.empty()) { // pass through inventory submits
1433                 m_script->on_playerReceiveFields(playersao, client_formspec_name, fields);
1434                 return;
1435         }
1436
1437         // verify that we displayed the formspec to the user
1438         const auto peer_state_iterator = m_formspec_state_data.find(peer_id);
1439         if (peer_state_iterator != m_formspec_state_data.end()) {
1440                 const std::string &server_formspec_name = peer_state_iterator->second;
1441                 if (client_formspec_name == server_formspec_name) {
1442                         auto it = fields.find("quit");
1443                         if (it != fields.end() && it->second == "true")
1444                                 m_formspec_state_data.erase(peer_state_iterator);
1445
1446                         m_script->on_playerReceiveFields(playersao, client_formspec_name, fields);
1447                         return;
1448                 }
1449                 actionstream << "'" << player->getName()
1450                         << "' submitted formspec ('" << client_formspec_name
1451                         << "') but the name of the formspec doesn't match the"
1452                         " expected name ('" << server_formspec_name << "')";
1453
1454         } else {
1455                 actionstream << "'" << player->getName()
1456                         << "' submitted formspec ('" << client_formspec_name
1457                         << "') but server hasn't sent formspec to client";
1458         }
1459         actionstream << ", possible exploitation attempt" << std::endl;
1460 }
1461
1462 void Server::handleCommand_FirstSrp(NetworkPacket* pkt)
1463 {
1464         session_t peer_id = pkt->getPeerId();
1465         RemoteClient *client = getClient(peer_id, CS_Invalid);
1466         ClientState cstate = client->getState();
1467         const std::string playername = client->getName();
1468
1469         std::string salt, verification_key;
1470
1471         std::string addr_s = getPeerAddress(peer_id).serializeString();
1472         u8 is_empty;
1473
1474         *pkt >> salt >> verification_key >> is_empty;
1475
1476         verbosestream << "Server: Got TOSERVER_FIRST_SRP from " << addr_s
1477                 << ", with is_empty=" << (is_empty == 1) << std::endl;
1478
1479         const bool empty_disallowed = !isSingleplayer() && is_empty == 1 &&
1480                 g_settings->getBool("disallow_empty_password");
1481
1482         // Either this packet is sent because the user is new or to change the password
1483         if (cstate == CS_HelloSent) {
1484                 if (!client->isMechAllowed(AUTH_MECHANISM_FIRST_SRP)) {
1485                         actionstream << "Server: Client from " << addr_s
1486                                         << " tried to set password without being "
1487                                         << "authenticated, or the username being new." << std::endl;
1488                         DenyAccess(peer_id, SERVER_ACCESSDENIED_UNEXPECTED_DATA);
1489                         return;
1490                 }
1491
1492                 if (empty_disallowed) {
1493                         actionstream << "Server: " << playername
1494                                         << " supplied empty password from " << addr_s << std::endl;
1495                         DenyAccess(peer_id, SERVER_ACCESSDENIED_EMPTY_PASSWORD);
1496                         return;
1497                 }
1498
1499                 std::string initial_ver_key;
1500                 initial_ver_key = encode_srp_verifier(verification_key, salt);
1501
1502                 // It is possible for multiple connections to get this far with the same
1503                 // player name. In the end only one player with a given name will be emerged
1504                 // (see Server::StateTwoClientInit) but we still have to be careful here.
1505                 if (m_script->getAuth(playername, nullptr, nullptr)) {
1506                         // Another client beat us to it
1507                         actionstream << "Server: Client from " << addr_s
1508                                 << " tried to register " << playername << " a second time."
1509                                 << std::endl;
1510                         DenyAccess(peer_id, SERVER_ACCESSDENIED_ALREADY_CONNECTED);
1511                         return;
1512                 }
1513                 m_script->createAuth(playername, initial_ver_key);
1514                 m_script->on_authplayer(playername, addr_s, true);
1515
1516                 acceptAuth(peer_id, false);
1517         } else {
1518                 if (cstate < CS_SudoMode) {
1519                         infostream << "Server::ProcessData(): Ignoring TOSERVER_FIRST_SRP from "
1520                                         << addr_s << ": " << "Client has wrong state " << cstate << "."
1521                                         << std::endl;
1522                         return;
1523                 }
1524                 m_clients.event(peer_id, CSE_SudoLeave);
1525
1526                 if (empty_disallowed) {
1527                         actionstream << "Server: " << playername
1528                                         << " supplied empty password" << std::endl;
1529                         SendChatMessage(peer_id, ChatMessage(CHATMESSAGE_TYPE_SYSTEM,
1530                                 L"Changing to an empty password is not allowed."));
1531                         return;
1532                 }
1533
1534                 std::string pw_db_field = encode_srp_verifier(verification_key, salt);
1535                 bool success = m_script->setPassword(playername, pw_db_field);
1536                 if (success) {
1537                         actionstream << playername << " changes password" << std::endl;
1538                         SendChatMessage(peer_id, ChatMessage(CHATMESSAGE_TYPE_SYSTEM,
1539                                 L"Password change successful."));
1540                 } else {
1541                         actionstream << playername <<
1542                                 " tries to change password but it fails" << std::endl;
1543                         SendChatMessage(peer_id, ChatMessage(CHATMESSAGE_TYPE_SYSTEM,
1544                                 L"Password change failed or unavailable."));
1545                 }
1546         }
1547 }
1548
1549 void Server::handleCommand_SrpBytesA(NetworkPacket* pkt)
1550 {
1551         session_t peer_id = pkt->getPeerId();
1552         RemoteClient *client = getClient(peer_id, CS_Invalid);
1553         ClientState cstate = client->getState();
1554
1555         if (!((cstate == CS_HelloSent) || (cstate == CS_Active))) {
1556                 actionstream << "Server: got SRP _A packet in wrong state " << cstate <<
1557                         " from " << getPeerAddress(peer_id).serializeString() <<
1558                         ". Ignoring." << std::endl;
1559                 return;
1560         }
1561
1562         const bool wantSudo = (cstate == CS_Active);
1563
1564         if (client->chosen_mech != AUTH_MECHANISM_NONE) {
1565                 actionstream << "Server: got SRP _A packet, while auth is already "
1566                         "going on with mech " << client->chosen_mech << " from " <<
1567                         getPeerAddress(peer_id).serializeString() <<
1568                         " (wantSudo=" << wantSudo << "). Ignoring." << std::endl;
1569                 if (wantSudo) {
1570                         DenySudoAccess(peer_id);
1571                         return;
1572                 }
1573
1574                 DenyAccess(peer_id, SERVER_ACCESSDENIED_UNEXPECTED_DATA);
1575                 return;
1576         }
1577
1578         std::string bytes_A;
1579         u8 based_on;
1580         *pkt >> bytes_A >> based_on;
1581
1582         infostream << "Server: TOSERVER_SRP_BYTES_A received with "
1583                 << "based_on=" << int(based_on) << " and len_A="
1584                 << bytes_A.length() << "." << std::endl;
1585
1586         AuthMechanism chosen = (based_on == 0) ?
1587                 AUTH_MECHANISM_LEGACY_PASSWORD : AUTH_MECHANISM_SRP;
1588
1589         if (wantSudo) {
1590                 if (!client->isSudoMechAllowed(chosen)) {
1591                         actionstream << "Server: Player \"" << client->getName() <<
1592                                 "\" at " << getPeerAddress(peer_id).serializeString() <<
1593                                 " tried to change password using unallowed mech " << chosen <<
1594                                 "." << std::endl;
1595                         DenySudoAccess(peer_id);
1596                         return;
1597                 }
1598         } else {
1599                 if (!client->isMechAllowed(chosen)) {
1600                         actionstream << "Server: Client tried to authenticate from " <<
1601                                 getPeerAddress(peer_id).serializeString() <<
1602                                 " using unallowed mech " << chosen << "." << std::endl;
1603                         DenyAccess(peer_id, SERVER_ACCESSDENIED_UNEXPECTED_DATA);
1604                         return;
1605                 }
1606         }
1607
1608         client->chosen_mech = chosen;
1609
1610         std::string salt, verifier;
1611
1612         if (based_on == 0) {
1613
1614                 generate_srp_verifier_and_salt(client->getName(), client->enc_pwd,
1615                         &verifier, &salt);
1616         } else if (!decode_srp_verifier_and_salt(client->enc_pwd, &verifier, &salt)) {
1617                 // Non-base64 errors should have been catched in the init handler
1618                 actionstream << "Server: User " << client->getName() <<
1619                         " tried to log in, but srp verifier field was invalid (most likely "
1620                         "invalid base64)." << std::endl;
1621                 DenyAccess(peer_id, SERVER_ACCESSDENIED_SERVER_FAIL);
1622                 return;
1623         }
1624
1625         char *bytes_B = 0;
1626         size_t len_B = 0;
1627
1628         client->auth_data = srp_verifier_new(SRP_SHA256, SRP_NG_2048,
1629                 client->getName().c_str(),
1630                 (const unsigned char *) salt.c_str(), salt.size(),
1631                 (const unsigned char *) verifier.c_str(), verifier.size(),
1632                 (const unsigned char *) bytes_A.c_str(), bytes_A.size(),
1633                 NULL, 0,
1634                 (unsigned char **) &bytes_B, &len_B, NULL, NULL);
1635
1636         if (!bytes_B) {
1637                 actionstream << "Server: User " << client->getName()
1638                         << " tried to log in, SRP-6a safety check violated in _A handler."
1639                         << std::endl;
1640                 if (wantSudo) {
1641                         DenySudoAccess(peer_id);
1642                         client->resetChosenMech();
1643                         return;
1644                 }
1645
1646                 DenyAccess(peer_id, SERVER_ACCESSDENIED_UNEXPECTED_DATA);
1647                 return;
1648         }
1649
1650         NetworkPacket resp_pkt(TOCLIENT_SRP_BYTES_S_B, 0, peer_id);
1651         resp_pkt << salt << std::string(bytes_B, len_B);
1652         Send(&resp_pkt);
1653 }
1654
1655 void Server::handleCommand_SrpBytesM(NetworkPacket* pkt)
1656 {
1657         session_t peer_id = pkt->getPeerId();
1658         RemoteClient *client = getClient(peer_id, CS_Invalid);
1659         ClientState cstate = client->getState();
1660         const std::string addr_s = client->getAddress().serializeString();
1661         const std::string playername = client->getName();
1662
1663         const bool wantSudo = (cstate == CS_Active);
1664
1665         verbosestream << "Server: Received TOSERVER_SRP_BYTES_M." << std::endl;
1666
1667         if (!((cstate == CS_HelloSent) || (cstate == CS_Active))) {
1668                 warningstream << "Server: got SRP_M packet in wrong state "
1669                         << cstate << " from " << addr_s << ". Ignoring." << std::endl;
1670                 return;
1671         }
1672
1673         if (client->chosen_mech != AUTH_MECHANISM_SRP &&
1674                         client->chosen_mech != AUTH_MECHANISM_LEGACY_PASSWORD) {
1675                 warningstream << "Server: got SRP_M packet, while auth "
1676                         "is going on with mech " << client->chosen_mech << " from "
1677                         << addr_s << " (wantSudo=" << wantSudo << "). Denying." << std::endl;
1678                 if (wantSudo) {
1679                         DenySudoAccess(peer_id);
1680                         return;
1681                 }
1682
1683                 DenyAccess(peer_id, SERVER_ACCESSDENIED_UNEXPECTED_DATA);
1684                 return;
1685         }
1686
1687         std::string bytes_M;
1688         *pkt >> bytes_M;
1689
1690         if (srp_verifier_get_session_key_length((SRPVerifier *) client->auth_data)
1691                         != bytes_M.size()) {
1692                 actionstream << "Server: User " << playername << " at " << addr_s
1693                         << " sent bytes_M with invalid length " << bytes_M.size() << std::endl;
1694                 DenyAccess(peer_id, SERVER_ACCESSDENIED_UNEXPECTED_DATA);
1695                 return;
1696         }
1697
1698         unsigned char *bytes_HAMK = 0;
1699
1700         srp_verifier_verify_session((SRPVerifier *) client->auth_data,
1701                 (unsigned char *)bytes_M.c_str(), &bytes_HAMK);
1702
1703         if (!bytes_HAMK) {
1704                 if (wantSudo) {
1705                         actionstream << "Server: User " << playername << " at " << addr_s
1706                                 << " tried to change their password, but supplied wrong"
1707                                 << " (SRP) password for authentication." << std::endl;
1708                         DenySudoAccess(peer_id);
1709                         client->resetChosenMech();
1710                         return;
1711                 }
1712
1713                 actionstream << "Server: User " << playername << " at " << addr_s
1714                         << " supplied wrong password (auth mechanism: SRP)." << std::endl;
1715                 m_script->on_authplayer(playername, addr_s, false);
1716                 DenyAccess(peer_id, SERVER_ACCESSDENIED_WRONG_PASSWORD);
1717                 return;
1718         }
1719
1720         if (client->create_player_on_auth_success) {
1721                 m_script->createAuth(playername, client->enc_pwd);
1722
1723                 if (!m_script->getAuth(playername, nullptr, nullptr)) {
1724                         errorstream << "Server: " << playername <<
1725                                 " cannot be authenticated (auth handler does not work?)" <<
1726                                 std::endl;
1727                         DenyAccess(peer_id, SERVER_ACCESSDENIED_SERVER_FAIL);
1728                         return;
1729                 }
1730                 client->create_player_on_auth_success = false;
1731         }
1732
1733         m_script->on_authplayer(playername, addr_s, true);
1734         acceptAuth(peer_id, wantSudo);
1735 }
1736
1737 /*
1738  * Mod channels
1739  */
1740
1741 void Server::handleCommand_ModChannelJoin(NetworkPacket *pkt)
1742 {
1743         std::string channel_name;
1744         *pkt >> channel_name;
1745
1746         session_t peer_id = pkt->getPeerId();
1747         NetworkPacket resp_pkt(TOCLIENT_MODCHANNEL_SIGNAL,
1748                 1 + 2 + channel_name.size(), peer_id);
1749
1750         // Send signal to client to notify join succeed or not
1751         if (g_settings->getBool("enable_mod_channels") &&
1752                         m_modchannel_mgr->joinChannel(channel_name, peer_id)) {
1753                 resp_pkt << (u8) MODCHANNEL_SIGNAL_JOIN_OK;
1754                 infostream << "Peer " << peer_id << " joined channel " <<
1755                         channel_name << std::endl;
1756         }
1757         else {
1758                 resp_pkt << (u8)MODCHANNEL_SIGNAL_JOIN_FAILURE;
1759                 infostream << "Peer " << peer_id << " tried to join channel " <<
1760                         channel_name << ", but was already registered." << std::endl;
1761         }
1762         resp_pkt << channel_name;
1763         Send(&resp_pkt);
1764 }
1765
1766 void Server::handleCommand_ModChannelLeave(NetworkPacket *pkt)
1767 {
1768         std::string channel_name;
1769         *pkt >> channel_name;
1770
1771         session_t peer_id = pkt->getPeerId();
1772         NetworkPacket resp_pkt(TOCLIENT_MODCHANNEL_SIGNAL,
1773                 1 + 2 + channel_name.size(), peer_id);
1774
1775         // Send signal to client to notify join succeed or not
1776         if (g_settings->getBool("enable_mod_channels") &&
1777                         m_modchannel_mgr->leaveChannel(channel_name, peer_id)) {
1778                 resp_pkt << (u8)MODCHANNEL_SIGNAL_LEAVE_OK;
1779                 infostream << "Peer " << peer_id << " left channel " << channel_name <<
1780                         std::endl;
1781         } else {
1782                 resp_pkt << (u8) MODCHANNEL_SIGNAL_LEAVE_FAILURE;
1783                 infostream << "Peer " << peer_id << " left channel " << channel_name <<
1784                         ", but was not registered." << std::endl;
1785         }
1786         resp_pkt << channel_name;
1787         Send(&resp_pkt);
1788 }
1789
1790 void Server::handleCommand_ModChannelMsg(NetworkPacket *pkt)
1791 {
1792         std::string channel_name, channel_msg;
1793         *pkt >> channel_name >> channel_msg;
1794
1795         session_t peer_id = pkt->getPeerId();
1796         verbosestream << "Mod channel message received from peer " << peer_id <<
1797                 " on channel " << channel_name << " message: " << channel_msg <<
1798                 std::endl;
1799
1800         // If mod channels are not enabled, discard message
1801         if (!g_settings->getBool("enable_mod_channels")) {
1802                 return;
1803         }
1804
1805         // If channel not registered, signal it and ignore message
1806         if (!m_modchannel_mgr->channelRegistered(channel_name)) {
1807                 NetworkPacket resp_pkt(TOCLIENT_MODCHANNEL_SIGNAL,
1808                         1 + 2 + channel_name.size(), peer_id);
1809                 resp_pkt << (u8)MODCHANNEL_SIGNAL_CHANNEL_NOT_REGISTERED << channel_name;
1810                 Send(&resp_pkt);
1811                 return;
1812         }
1813
1814         // @TODO: filter, rate limit
1815
1816         broadcastModChannelMessage(channel_name, channel_msg, peer_id);
1817 }
1818
1819 void Server::handleCommand_HaveMedia(NetworkPacket *pkt)
1820 {
1821         std::vector<u32> tokens;
1822         u8 numtokens;
1823
1824         *pkt >> numtokens;
1825         for (u16 i = 0; i < numtokens; i++) {
1826                 u32 n;
1827                 *pkt >> n;
1828                 tokens.emplace_back(n);
1829         }
1830
1831         const session_t peer_id = pkt->getPeerId();
1832         auto player = m_env->getPlayer(peer_id);
1833
1834         for (const u32 token : tokens) {
1835                 auto it = m_pending_dyn_media.find(token);
1836                 if (it == m_pending_dyn_media.end())
1837                         continue;
1838                 if (it->second.waiting_players.count(peer_id)) {
1839                         it->second.waiting_players.erase(peer_id);
1840                         if (player)
1841                                 getScriptIface()->on_dynamic_media_added(token, player->getName());
1842                 }
1843         }
1844 }
1845
1846 void Server::handleCommand_UpdateClientInfo(NetworkPacket *pkt)
1847 {
1848         ClientDynamicInfo info;
1849         *pkt >> info.render_target_size.X;
1850         *pkt >> info.render_target_size.Y;
1851         *pkt >> info.real_gui_scaling;
1852         *pkt >> info.real_hud_scaling;
1853         *pkt >> info.max_fs_size.X;
1854         *pkt >> info.max_fs_size.Y;
1855
1856         session_t peer_id = pkt->getPeerId();
1857         RemoteClient *client = getClient(peer_id, CS_Invalid);
1858         client->setDynamicInfo(info);
1859 }