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 "server.h"
  21 #include "log.h"
  22
  23 #include "content_abm.h"
  24 #include "content_sao.h"
  25 #include "emerge.h"
  26 #include "main.h"
  27 #include "nodedef.h"
  28 #include "player.h"
  29 #include "rollback_interface.h"
  30 #include "scripting_game.h"
  31 #include "settings.h"
  32 #include "tool.h"
  33 #include "version.h"
  34 #include "network/networkprotocol.h"
  35 #include "network/serveropcodes.h"
  36 #include "util/base64.h"
  37 #include "util/pointedthing.h"
  38 #include "util/serialize.h"
  39
  40 void Server::handleCommand_Deprecated(NetworkPacket* pkt)
  41 {
  42         infostream << "Server: " << toServerCommandTable[pkt->getCommand()].name
  43                 << " not supported anymore" << std::endl;
  44 }
  45
  46 void Server::handleCommand_Init(NetworkPacket* pkt)
  47 {
  48
  49         if(pkt->getSize() < 1)
  50                 return;
  51
  52         RemoteClient* client = getClient(pkt->getPeerId(), CS_Created);
  53
  54         std::string addr_s;
  55         try {
  56                 Address address = getPeerAddress(pkt->getPeerId());
  57                 addr_s = address.serializeString();
  58         }
  59         catch (con::PeerNotFoundException &e) {
  60                 /*
  61                  * no peer for this packet found
  62                  * most common reason is peer timeout, e.g. peer didn't
  63                  * respond for some time, your server was overloaded or
  64                  * things like that.
  65                  */
  66                 infostream << "Server::ProcessData(): Canceling: peer "
  67                                 << pkt->getPeerId() << " not found" << std::endl;
  68                 return;
  69         }
  70
  71         // If net_proto_version is set, this client has already been handled
  72         if (client->getState() > CS_Created) {
  73                 verbosestream << "Server: Ignoring multiple TOSERVER_INITs from "
  74                                 << addr_s << " (peer_id=" << pkt->getPeerId() << ")" << std::endl;
  75                 return;
  76         }
  77
  78         verbosestream << "Server: Got TOSERVER_INIT from " << addr_s << " (peer_id="
  79                         << pkt->getPeerId() << ")" << std::endl;
  80
  81         // Do not allow multiple players in simple singleplayer mode.
  82         // This isn't a perfect way to do it, but will suffice for now
  83         if (m_simple_singleplayer_mode && m_clients.getClientIDs().size() > 1) {
  84                 infostream << "Server: Not allowing another client (" << addr_s
  85                                 << ") to connect in simple singleplayer mode" << std::endl;
  86                 DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_SINGLEPLAYER);
  87                 return;
  88         }
  89
  90         // First byte after command is maximum supported
  91         // serialization version
  92         u8 client_max;
  93         u8 compression_modes;
  94         u16 min_net_proto_version = 0;
  95         u16 max_net_proto_version;
  96
  97         *pkt >> client_max >> compression_modes >> min_net_proto_version
  98                         >> max_net_proto_version;
  99
 100         u8 our_max = SER_FMT_VER_HIGHEST_READ;
 101         // Use the highest version supported by both
 102         int deployed = std::min(client_max, our_max);
 103         // If it's lower than the lowest supported, give up.
 104         if (deployed < SER_FMT_VER_LOWEST)
 105                 deployed = SER_FMT_VER_INVALID;
 106
 107         if (deployed == SER_FMT_VER_INVALID) {
 108                 actionstream << "Server: A mismatched client tried to connect from "
 109                                 << addr_s << std::endl;
 110                 infostream<<"Server: Cannot negotiate serialization version with "
 111                                 << addr_s << std::endl;
 112                 DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_WRONG_VERSION);
 113                 return;
 114         }
 115
 116         client->setPendingSerializationVersion(deployed);
 117
 118         /*
 119                 Read and check network protocol version
 120         */
 121
 122         u16 net_proto_version = 0;
 123
 124         // Figure out a working version if it is possible at all
 125         if (max_net_proto_version >= SERVER_PROTOCOL_VERSION_MIN ||
 126                         min_net_proto_version <= SERVER_PROTOCOL_VERSION_MAX) {
 127                 // If maximum is larger than our maximum, go with our maximum
 128                 if (max_net_proto_version > SERVER_PROTOCOL_VERSION_MAX)
 129                         net_proto_version = SERVER_PROTOCOL_VERSION_MAX;
 130                 // Else go with client's maximum
 131                 else
 132                         net_proto_version = max_net_proto_version;
 133         }
 134
 135         verbosestream << "Server: " << addr_s << ": Protocol version: min: "
 136                         << min_net_proto_version << ", max: " << max_net_proto_version
 137                         << ", chosen: " << net_proto_version << std::endl;
 138
 139         client->net_proto_version = net_proto_version;
 140
 141         // On this handler protocol version 25 is required
 142         if (net_proto_version < 25 ||
 143                         net_proto_version < SERVER_PROTOCOL_VERSION_MIN ||
 144                         net_proto_version > SERVER_PROTOCOL_VERSION_MAX) {
 145                 actionstream << "Server: A mismatched client tried to connect from "
 146                                 << addr_s << std::endl;
 147                 DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_WRONG_VERSION);
 148                 return;
 149         }
 150
 151         if (g_settings->getBool("strict_protocol_version_checking")) {
 152                 if (net_proto_version != LATEST_PROTOCOL_VERSION) {
 153                         actionstream << "Server: A mismatched (strict) client tried to "
 154                                         << "connect from " << addr_s << std::endl;
 155                         DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_WRONG_VERSION);
 156                         return;
 157                 }
 158         }
 159
 160         // @TODO: check if we support same modes, but not required now
 161
 162         client->setSupportedCompressionModes(compression_modes);
 163
 164         m_clients.event(pkt->getPeerId(), CSE_Init);
 165 }
 166
 167 void Server::handleCommand_Auth(NetworkPacket* pkt)
 168 {
 169         std::string addr_s;
 170         try {
 171                 Address address = getPeerAddress(pkt->getPeerId());
 172                 addr_s = address.serializeString();
 173         }
 174         catch (con::PeerNotFoundException &e) {
 175                 /*
 176                  * no peer for this packet found
 177                  * most common reason is peer timeout, e.g. peer didn't
 178                  * respond for some time, your server was overloaded or
 179                  * things like that.
 180                  */
 181                 infostream << "Server::ProcessData(): Canceling: peer "
 182                                 << pkt->getPeerId() << " not found" << std::endl;
 183                 return;
 184         }
 185
 186         std::string playerName, playerPassword;
 187
 188         *pkt >> playerName >> playerPassword;
 189
 190         const char* playername = playerName.c_str();
 191
 192         if (playerName.size() > PLAYERNAME_SIZE) {
 193                 actionstream << "Server: Player with an too long name "
 194                                 << "tried to connect from " << addr_s << std::endl;
 195                 DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_WRONG_NAME);
 196                 return;
 197         }
 198
 199         if (string_allowed(playerName, PLAYERNAME_ALLOWED_CHARS) == false) {
 200                 actionstream << "Server: Player with an invalid name "
 201                                 << "tried to connect from " << addr_s << std::endl;
 202                 DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_WRONG_CHARS_IN_NAME);
 203                 return;
 204         }
 205
 206         if (!isSingleplayer() && strcasecmp(playername, "singleplayer") == 0) {
 207                 actionstream << "Server: Player with the name \"singleplayer\" "
 208                                 << "tried to connect from " << addr_s << std::endl;
 209                 DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_WRONG_NAME);
 210                 return;
 211         }
 212
 213         {
 214                 std::string reason;
 215                 if(m_script->on_prejoinplayer(playername, addr_s, reason)) {
 216                         actionstream << "Server: Player with the name \"" << playerName << "\" "
 217                                         << "tried to connect from " << addr_s << " "
 218                                         << "but it was disallowed for the following reason: "
 219                                         << reason << std::endl;
 220                         DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_CUSTOM_STRING,
 221                                         narrow_to_wide(reason.c_str()));
 222                         return;
 223                 }
 224         }
 225
 226         if (playerPassword.size() > PASSWORD_SIZE) {
 227                 actionstream << "Server: Player with an too long password "
 228                                 << "tried to connect from " << addr_s << std::endl;
 229                 DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_WRONG_PASSWORD);
 230                 return;
 231         }
 232
 233         infostream << "Server: New connection: \"" << playerName << "\" from "
 234                         << addr_s << " (peer_id=" << pkt->getPeerId() << ")" << std::endl;
 235
 236         if(!base64_is_valid(playerPassword)){
 237                 actionstream << "Server: " << playerName
 238                                 << " supplied invalid password hash" << std::endl;
 239                 DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_WRONG_PASSWORD);
 240                 return;
 241         }
 242
 243         // Enforce user limit.
 244         // Don't enforce for users that have some admin right
 245         if (m_clients.getClientIDs(CS_Created).size() >= g_settings->getU16("max_users") &&
 246                         !checkPriv(playername, "server") &&
 247                         !checkPriv(playername, "ban") &&
 248                         !checkPriv(playername, "privs") &&
 249                         !checkPriv(playername, "password") &&
 250                         playername != g_settings->get("name")) {
 251                 actionstream << "Server: " << playername << " tried to join, but there"
 252                                 << " are already max_users="
 253                                 << g_settings->getU16("max_users") << " players." << std::endl;
 254                 DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_TOO_MANY_USERS);
 255                 return;
 256         }
 257
 258         std::string checkpwd; // Password hash to check against
 259         bool has_auth = m_script->getAuth(playername, &checkpwd, NULL);
 260
 261         // If no authentication info exists for user, create it
 262         if (!has_auth) {
 263                 if (!isSingleplayer() &&
 264                                 g_settings->getBool("disallow_empty_password") &&
 265                                 playerPassword.empty()) {
 266                         actionstream << "Server: " << playerName
 267                                         << " supplied empty password" << std::endl;
 268                         DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_EMPTY_PASSWORD);
 269                         return;
 270                 }
 271                 std::wstring raw_default_password =
 272                         narrow_to_wide(g_settings->get("default_password"));
 273                 std::string initial_password =
 274                         translatePassword(playername, raw_default_password);
 275
 276                 // If default_password is empty, allow any initial password
 277                 if (raw_default_password.length() == 0)
 278                         initial_password = playerPassword.c_str();
 279
 280                 m_script->createAuth(playername, initial_password);
 281         }
 282
 283         has_auth = m_script->getAuth(playername, &checkpwd, NULL);
 284
 285         if(!has_auth) {
 286                 actionstream << "Server: " << playerName << " cannot be authenticated"
 287                                 << " (auth handler does not work?)" << std::endl;
 288                 DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_SERVER_FAIL);
 289                 return;
 290         }
 291
 292         if(playerPassword.c_str() != checkpwd) {
 293                 actionstream << "Server: " << playerName << " supplied wrong password"
 294                                 << std::endl;
 295                 DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_WRONG_PASSWORD);
 296                 return;
 297         }
 298
 299         RemotePlayer *player =
 300                         static_cast<RemotePlayer*>(m_env->getPlayer(playername));
 301
 302         if (player && player->peer_id != 0) {
 303                 errorstream << "Server: " << playername << ": Failed to emerge player"
 304                                 << " (player allocated to an another client)" << std::endl;
 305                 DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_ALREADY_CONNECTED);
 306         }
 307
 308         m_clients.setPlayerName(pkt->getPeerId(), playername);
 309
 310         /*
 311                 Answer with a TOCLIENT_INIT
 312         */
 313
 314         NetworkPacket resp_pkt(TOCLIENT_AUTH_ACCEPT, 1 + 6 + 8 + 4, pkt->getPeerId());
 315
 316         resp_pkt << v3f(0,0,0) << (u64) m_env->getServerMap().getSeed()
 317                         << g_settings->getFloat("dedicated_server_step");
 318
 319         Send(&resp_pkt);
 320         m_clients.event(pkt->getPeerId(), CSE_Init);
 321 }
 322
 323 void Server::handleCommand_Init_Legacy(NetworkPacket* pkt)
 324 {
 325         // [0] u8 SER_FMT_VER_HIGHEST_READ
 326         // [1] u8[20] player_name
 327         // [21] u8[28] password <--- can be sent without this, from old versions
 328
 329         if (pkt->getSize() < 1+PLAYERNAME_SIZE)
 330                 return;
 331
 332         RemoteClient* client = getClient(pkt->getPeerId(), CS_Created);
 333
 334         std::string addr_s;
 335         try {
 336                 Address address = getPeerAddress(pkt->getPeerId());
 337                 addr_s = address.serializeString();
 338         }
 339         catch (con::PeerNotFoundException &e) {
 340                 /*
 341                  * no peer for this packet found
 342                  * most common reason is peer timeout, e.g. peer didn't
 343                  * respond for some time, your server was overloaded or
 344                  * things like that.
 345                  */
 346                 infostream << "Server::ProcessData(): Cancelling: peer "
 347                                 << pkt->getPeerId() << " not found" << std::endl;
 348                 return;
 349         }
 350
 351         // If net_proto_version is set, this client has already been handled
 352         if (client->getState() > CS_Created) {
 353                 verbosestream << "Server: Ignoring multiple TOSERVER_INITs from "
 354                                 << addr_s << " (peer_id=" << pkt->getPeerId() << ")" << std::endl;
 355                 return;
 356         }
 357
 358         verbosestream << "Server: Got TOSERVER_INIT from " << addr_s << " (peer_id="
 359                         << pkt->getPeerId() << ")" << std::endl;
 360
 361         // Do not allow multiple players in simple singleplayer mode.
 362         // This isn't a perfect way to do it, but will suffice for now
 363         if (m_simple_singleplayer_mode && m_clients.getClientIDs().size() > 1) {
 364                 infostream << "Server: Not allowing another client (" << addr_s
 365                                 << ") to connect in simple singleplayer mode" << std::endl;
 366                 DenyAccess_Legacy(pkt->getPeerId(), L"Running in simple singleplayer mode.");
 367                 return;
 368         }
 369
 370         // First byte after command is maximum supported
 371         // serialization version
 372         u8 client_max;
 373
 374         *pkt >> client_max;
 375
 376         u8 our_max = SER_FMT_VER_HIGHEST_READ;
 377         // Use the highest version supported by both
 378         int deployed = std::min(client_max, our_max);
 379         // If it's lower than the lowest supported, give up.
 380         if (deployed < SER_FMT_VER_LOWEST)
 381                 deployed = SER_FMT_VER_INVALID;
 382
 383         if (deployed == SER_FMT_VER_INVALID) {
 384                 actionstream << "Server: A mismatched client tried to connect from "
 385                                 << addr_s << std::endl;
 386                 infostream<<"Server: Cannot negotiate serialization version with "
 387                                 << addr_s << std::endl;
 388                 DenyAccess_Legacy(pkt->getPeerId(), std::wstring(
 389                                 L"Your client's version is not supported.\n"
 390                                 L"Server version is ")
 391                                 + narrow_to_wide(minetest_version_simple) + L"."
 392                 );
 393                 return;
 394         }
 395
 396         client->setPendingSerializationVersion(deployed);
 397
 398         /*
 399                 Read and check network protocol version
 400         */
 401
 402         u16 min_net_proto_version = 0;
 403         if (pkt->getSize() >= 1 + PLAYERNAME_SIZE + PASSWORD_SIZE + 2)
 404                 min_net_proto_version = pkt->getU16(1 + PLAYERNAME_SIZE + PASSWORD_SIZE);
 405
 406         // Use same version as minimum and maximum if maximum version field
 407         // doesn't exist (backwards compatibility)
 408         u16 max_net_proto_version = min_net_proto_version;
 409         if (pkt->getSize() >= 1 + PLAYERNAME_SIZE + PASSWORD_SIZE + 2 + 2)
 410                 max_net_proto_version = pkt->getU16(1 + PLAYERNAME_SIZE + PASSWORD_SIZE + 2);
 411
 412         // Start with client's maximum version
 413         u16 net_proto_version = max_net_proto_version;
 414
 415         // Figure out a working version if it is possible at all
 416         if (max_net_proto_version >= SERVER_PROTOCOL_VERSION_MIN ||
 417                         min_net_proto_version <= SERVER_PROTOCOL_VERSION_MAX) {
 418                 // If maximum is larger than our maximum, go with our maximum
 419                 if (max_net_proto_version > SERVER_PROTOCOL_VERSION_MAX)
 420                         net_proto_version = SERVER_PROTOCOL_VERSION_MAX;
 421                 // Else go with client's maximum
 422                 else
 423                         net_proto_version = max_net_proto_version;
 424         }
 425
 426         verbosestream << "Server: " << addr_s << ": Protocol version: min: "
 427                         << min_net_proto_version << ", max: " << max_net_proto_version
 428                         << ", chosen: " << net_proto_version << std::endl;
 429
 430         client->net_proto_version = net_proto_version;
 431
 432         if (net_proto_version < SERVER_PROTOCOL_VERSION_MIN ||
 433                         net_proto_version > SERVER_PROTOCOL_VERSION_MAX) {
 434                 actionstream << "Server: A mismatched client tried to connect from "
 435                                 << addr_s << std::endl;
 436                 DenyAccess_Legacy(pkt->getPeerId(), std::wstring(
 437                                 L"Your client's version is not supported.\n"
 438                                 L"Server version is ")
 439                                 + narrow_to_wide(minetest_version_simple) + L",\n"
 440                                 + L"server's PROTOCOL_VERSION is "
 441                                 + narrow_to_wide(itos(SERVER_PROTOCOL_VERSION_MIN))
 442                                 + L"..."
 443                                 + narrow_to_wide(itos(SERVER_PROTOCOL_VERSION_MAX))
 444                                 + L", client's PROTOCOL_VERSION is "
 445                                 + narrow_to_wide(itos(min_net_proto_version))
 446                                 + L"..."
 447                                 + narrow_to_wide(itos(max_net_proto_version))
 448                 );
 449                 return;
 450         }
 451
 452         if (g_settings->getBool("strict_protocol_version_checking")) {
 453                 if (net_proto_version != LATEST_PROTOCOL_VERSION) {
 454                         actionstream << "Server: A mismatched (strict) client tried to "
 455                                         << "connect from " << addr_s << std::endl;
 456                         DenyAccess_Legacy(pkt->getPeerId(), std::wstring(
 457                                         L"Your client's version is not supported.\n"
 458                                         L"Server version is ")
 459                                         + narrow_to_wide(minetest_version_simple) + L",\n"
 460                                         + L"server's PROTOCOL_VERSION (strict) is "
 461                                         + narrow_to_wide(itos(LATEST_PROTOCOL_VERSION))
 462                                         + L", client's PROTOCOL_VERSION is "
 463                                         + narrow_to_wide(itos(min_net_proto_version))
 464                                         + L"..."
 465                                         + narrow_to_wide(itos(max_net_proto_version))
 466                         );
 467                         return;
 468                 }
 469         }
 470
 471         /*
 472                 Set up player
 473         */
 474         char playername[PLAYERNAME_SIZE];
 475         unsigned int playername_length = 0;
 476         for (; playername_length < PLAYERNAME_SIZE; playername_length++ ) {
 477                 playername[playername_length] = pkt->getChar(1+playername_length);
 478                 if (pkt->getChar(1+playername_length) == 0)
 479                         break;
 480         }
 481
 482         if (playername_length == PLAYERNAME_SIZE) {
 483                 actionstream << "Server: Player with name exceeding max length "
 484                                 << "tried to connect from " << addr_s << std::endl;
 485                 DenyAccess_Legacy(pkt->getPeerId(), L"Name too long");
 486                 return;
 487         }
 488
 489
 490         if (playername[0]=='\0') {
 491                 actionstream << "Server: Player with an empty name "
 492                                 << "tried to connect from " << addr_s << std::endl;
 493                 DenyAccess_Legacy(pkt->getPeerId(), L"Empty name");
 494                 return;
 495         }
 496
 497         if (string_allowed(playername, PLAYERNAME_ALLOWED_CHARS) == false) {
 498                 actionstream << "Server: Player with an invalid name "
 499                                 << "tried to connect from " << addr_s << std::endl;
 500                 DenyAccess_Legacy(pkt->getPeerId(), L"Name contains unallowed characters");
 501                 return;
 502         }
 503
 504         if (!isSingleplayer() && strcasecmp(playername, "singleplayer") == 0) {
 505                 actionstream << "Server: Player with the name \"singleplayer\" "
 506                                 << "tried to connect from " << addr_s << std::endl;
 507                 DenyAccess_Legacy(pkt->getPeerId(), L"Name is not allowed");
 508                 return;
 509         }
 510
 511         {
 512                 std::string reason;
 513                 if (m_script->on_prejoinplayer(playername, addr_s, reason)) {
 514                         actionstream << "Server: Player with the name \"" << playername << "\" "
 515                                         << "tried to connect from " << addr_s << " "
 516                                         << "but it was disallowed for the following reason: "
 517                                         << reason << std::endl;
 518                         DenyAccess_Legacy(pkt->getPeerId(), narrow_to_wide(reason.c_str()));
 519                         return;
 520                 }
 521         }
 522
 523         infostream<<"Server: New connection: \""<<playername<<"\" from "
 524                         <<addr_s<<" (peer_id="<<pkt->getPeerId()<<")"<<std::endl;
 525
 526         // Get password
 527         char given_password[PASSWORD_SIZE];
 528         if (pkt->getSize() < 1 + PLAYERNAME_SIZE + PASSWORD_SIZE) {
 529                 // old version - assume blank password
 530                 given_password[0] = 0;
 531         }
 532         else {
 533                 for (u16 i = 0; i < PASSWORD_SIZE - 1; i++) {
 534                         given_password[i] = pkt->getChar(21 + i);
 535                 }
 536                 given_password[PASSWORD_SIZE - 1] = 0;
 537         }
 538
 539         if (!base64_is_valid(given_password)) {
 540                 actionstream << "Server: " << playername
 541                                 << " supplied invalid password hash" << std::endl;
 542                 DenyAccess_Legacy(pkt->getPeerId(), L"Invalid password hash");
 543                 return;
 544         }
 545
 546         // Enforce user limit.
 547         // Don't enforce for users that have some admin right
 548         if (m_clients.getClientIDs(CS_Created).size() >= g_settings->getU16("max_users") &&
 549                         !checkPriv(playername, "server") &&
 550                         !checkPriv(playername, "ban") &&
 551                         !checkPriv(playername, "privs") &&
 552                         !checkPriv(playername, "password") &&
 553                         playername != g_settings->get("name")) {
 554                 actionstream << "Server: " << playername << " tried to join, but there"
 555                                 << " are already max_users="
 556                                 << g_settings->getU16("max_users") << " players." << std::endl;
 557                 DenyAccess_Legacy(pkt->getPeerId(), L"Too many users.");
 558                 return;
 559         }
 560
 561         std::string checkpwd; // Password hash to check against
 562         bool has_auth = m_script->getAuth(playername, &checkpwd, NULL);
 563
 564         // If no authentication info exists for user, create it
 565         if (!has_auth) {
 566                 if (!isSingleplayer() &&
 567                                 g_settings->getBool("disallow_empty_password") &&
 568                                 std::string(given_password) == "") {
 569                         actionstream << "Server: " << playername
 570                                         << " supplied empty password" << std::endl;
 571                         DenyAccess_Legacy(pkt->getPeerId(), L"Empty passwords are "
 572                                         L"disallowed. Set a password and try again.");
 573                         return;
 574                 }
 575                 std::wstring raw_default_password =
 576                         narrow_to_wide(g_settings->get("default_password"));
 577                 std::string initial_password =
 578                         translatePassword(playername, raw_default_password);
 579
 580                 // If default_password is empty, allow any initial password
 581                 if (raw_default_password.length() == 0)
 582                         initial_password = given_password;
 583
 584                 m_script->createAuth(playername, initial_password);
 585         }
 586
 587         has_auth = m_script->getAuth(playername, &checkpwd, NULL);
 588
 589         if (!has_auth) {
 590                 actionstream << "Server: " << playername << " cannot be authenticated"
 591                                 << " (auth handler does not work?)" << std::endl;
 592                 DenyAccess_Legacy(pkt->getPeerId(), L"Not allowed to login");
 593                 return;
 594         }
 595
 596         if (given_password != checkpwd) {
 597                 actionstream << "Server: " << playername << " supplied wrong password"
 598                                 << std::endl;
 599                 DenyAccess_Legacy(pkt->getPeerId(), L"Wrong password");
 600                 return;
 601         }
 602
 603         RemotePlayer *player =
 604                         static_cast<RemotePlayer*>(m_env->getPlayer(playername));
 605
 606         if (player && player->peer_id != 0) {
 607                 errorstream << "Server: " << playername << ": Failed to emerge player"
 608                                 << " (player allocated to an another client)" << std::endl;
 609                 DenyAccess_Legacy(pkt->getPeerId(), L"Another client is connected with this "
 610                                 L"name. If your client closed unexpectedly, try again in "
 611                                 L"a minute.");
 612         }
 613
 614         m_clients.setPlayerName(pkt->getPeerId(), playername);
 615
 616         /*
 617                 Answer with a TOCLIENT_INIT
 618         */
 619
 620         NetworkPacket resp_pkt(TOCLIENT_INIT_LEGACY, 1 + 6 + 8 + 4,
 621                         pkt->getPeerId());
 622
 623         resp_pkt << (u8) deployed << (v3s16) floatToInt(v3f(0,0,0), BS)
 624                         << (u64) m_env->getServerMap().getSeed()
 625                         << g_settings->getFloat("dedicated_server_step");
 626
 627         Send(&resp_pkt);
 628         m_clients.event(pkt->getPeerId(), CSE_Init);
 629 }
 630
 631 void Server::handleCommand_Init2(NetworkPacket* pkt)
 632 {
 633         verbosestream << "Server: Got TOSERVER_INIT2 from "
 634                         << pkt->getPeerId() << std::endl;
 635
 636         m_clients.event(pkt->getPeerId(), CSE_GotInit2);
 637         u16 protocol_version = m_clients.getProtocolVersion(pkt->getPeerId());
 638
 639
 640         ///// begin compatibility code
 641         PlayerSAO* playersao = NULL;
 642         if (protocol_version <= 22) {
 643                 playersao = StageTwoClientInit(pkt->getPeerId());
 644
 645                 if (playersao == NULL) {
 646                         errorstream
 647                                 << "TOSERVER_INIT2 stage 2 client init failed for peer "
 648                                 << pkt->getPeerId() << std::endl;
 649                         return;
 650                 }
 651         }
 652         ///// end compatibility code
 653
 654         /*
 655                 Send some initialization data
 656         */
 657
 658         infostream << "Server: Sending content to "
 659                         << getPlayerName(pkt->getPeerId()) << std::endl;
 660
 661         // Send player movement settings
 662         SendMovement(pkt->getPeerId());
 663
 664         // Send item definitions
 665         SendItemDef(pkt->getPeerId(), m_itemdef, protocol_version);
 666
 667         // Send node definitions
 668         SendNodeDef(pkt->getPeerId(), m_nodedef, protocol_version);
 669
 670         m_clients.event(pkt->getPeerId(), CSE_SetDefinitionsSent);
 671
 672         // Send media announcement
 673         sendMediaAnnouncement(pkt->getPeerId());
 674
 675         // Send detached inventories
 676         sendDetachedInventories(pkt->getPeerId());
 677
 678         // Send time of day
 679         u16 time = m_env->getTimeOfDay();
 680         float time_speed = g_settings->getFloat("time_speed");
 681         SendTimeOfDay(pkt->getPeerId(), time, time_speed);
 682
 683         ///// begin compatibility code
 684         if (protocol_version <= 22) {
 685                 m_clients.event(pkt->getPeerId(), CSE_SetClientReady);
 686                 m_script->on_joinplayer(playersao);
 687         }
 688         ///// end compatibility code
 689
 690         // Warnings about protocol version can be issued here
 691         if (getClient(pkt->getPeerId())->net_proto_version < LATEST_PROTOCOL_VERSION) {
 692                 SendChatMessage(pkt->getPeerId(), L"# Server: WARNING: YOUR CLIENT'S "
 693                                 L"VERSION MAY NOT BE FULLY COMPATIBLE WITH THIS SERVER!");
 694         }
 695 }
 696
 697 void Server::handleCommand_RequestMedia(NetworkPacket* pkt)
 698 {
 699         std::vector<std::string> tosend;
 700         u16 numfiles;
 701
 702         *pkt >> numfiles;
 703
 704         infostream << "Sending " << numfiles << " files to "
 705                         << getPlayerName(pkt->getPeerId()) << std::endl;
 706         verbosestream << "TOSERVER_REQUEST_MEDIA: " << std::endl;
 707
 708         for (u16 i = 0; i < numfiles; i++) {
 709                 std::string name;
 710
 711                 *pkt >> name;
 712
 713                 tosend.push_back(name);
 714                 verbosestream << "TOSERVER_REQUEST_MEDIA: requested file "
 715                                 << name << std::endl;
 716         }
 717
 718         sendRequestedMedia(pkt->getPeerId(), tosend);
 719 }
 720
 721 void Server::handleCommand_ReceivedMedia(NetworkPacket* pkt)
 722 {
 723 }
 724
 725 void Server::handleCommand_ClientReady(NetworkPacket* pkt)
 726 {
 727         u16 peer_id = pkt->getPeerId();
 728         u16 peer_proto_ver = getClient(peer_id, CS_InitDone)->net_proto_version;
 729
 730         // clients <= protocol version 22 did not send ready message,
 731         // they're already initialized
 732         if (peer_proto_ver <= 22) {
 733                 infostream << "Client sent message not expected by a "
 734                         << "client using protocol version <= 22,"
 735                         << "disconnecing peer_id: " << peer_id << std::endl;
 736                 m_con.DisconnectPeer(peer_id);
 737                 return;
 738         }
 739
 740         PlayerSAO* playersao = StageTwoClientInit(peer_id);
 741
 742         if (playersao == NULL) {
 743                 errorstream
 744                         << "TOSERVER_CLIENT_READY stage 2 client init failed for peer_id: "
 745                         << peer_id << std::endl;
 746                 m_con.DisconnectPeer(peer_id);
 747                 return;
 748         }
 749
 750
 751         if (pkt->getSize() < 8) {
 752                 errorstream
 753                         << "TOSERVER_CLIENT_READY client sent inconsistent data, disconnecting peer_id: "
 754                         << peer_id << std::endl;
 755                 m_con.DisconnectPeer(peer_id);
 756                 return;
 757         }
 758
 759         u8 major_ver, minor_ver, patch_ver;
 760         *pkt >> major_ver >> minor_ver >> patch_ver;
 761
 762         m_clients.setClientVersion(
 763                         peer_id, major_ver, minor_ver, patch_ver,
 764                         std::string(pkt->getString(6),(u16) pkt->getU8(4)));
 765
 766         m_clients.event(peer_id, CSE_SetClientReady);
 767         m_script->on_joinplayer(playersao);
 768 }
 769
 770 void Server::handleCommand_GotBlocks(NetworkPacket* pkt)
 771 {
 772         if (pkt->getSize() < 1)
 773                 return;
 774
 775         /*
 776                 [0] u16 command
 777                 [2] u8 count
 778                 [3] v3s16 pos_0
 779                 [3+6] v3s16 pos_1
 780                 ...
 781         */
 782
 783         u8 count;
 784         *pkt >> count;
 785
 786         RemoteClient *client = getClient(pkt->getPeerId());
 787
 788         for (u16 i = 0; i < count; i++) {
 789                 if ((s16)pkt->getSize() < 1 + (i + 1) * 6)
 790                         throw con::InvalidIncomingDataException
 791                                 ("GOTBLOCKS length is too short");
 792                 v3s16 p;
 793
 794                 *pkt >> p;
 795
 796                 client->GotBlock(p);
 797         }
 798 }
 799
 800 void Server::handleCommand_PlayerPos(NetworkPacket* pkt)
 801 {
 802         if (pkt->getSize() < 12 + 12 + 4 + 4)
 803                 return;
 804
 805         v3s32 ps, ss;
 806         s32 f32pitch, f32yaw;
 807
 808         *pkt >> ps;
 809         *pkt >> ss;
 810         *pkt >> f32pitch;
 811         *pkt >> f32yaw;
 812
 813         f32 pitch = (f32)f32pitch / 100.0;
 814         f32 yaw = (f32)f32yaw / 100.0;
 815         u32 keyPressed = 0;
 816
 817         if (pkt->getSize() >= 12 + 12 + 4 + 4 + 4)
 818                 *pkt >> keyPressed;
 819
 820         v3f position((f32)ps.X / 100.0, (f32)ps.Y / 100.0, (f32)ps.Z / 100.0);
 821         v3f speed((f32)ss.X / 100.0, (f32)ss.Y / 100.0, (f32)ss.Z / 100.0);
 822
 823         pitch = modulo360f(pitch);
 824         yaw = modulo360f(yaw);
 825
 826         Player *player = m_env->getPlayer(pkt->getPeerId());
 827         if (player == NULL) {
 828                 errorstream << "Server::ProcessData(): Cancelling: "
 829                                 "No player for peer_id=" << pkt->getPeerId()
 830                                 << " disconnecting peer!" << std::endl;
 831                 m_con.DisconnectPeer(pkt->getPeerId());
 832                 return;
 833         }
 834
 835         // If player is dead we don't care of this packet
 836         if (player->isDead()) {
 837                 verbosestream << "TOSERVER_PLAYERPOS: " << player->getName()
 838                         << " is dead. Ignoring packet";
 839                 return;
 840         }
 841
 842         PlayerSAO *playersao = player->getPlayerSAO();
 843         if (playersao == NULL) {
 844                 errorstream << "Server::ProcessData(): Cancelling: "
 845                                 "No player object for peer_id=" << pkt->getPeerId()
 846                                 << " disconnecting peer!" << std::endl;
 847                 m_con.DisconnectPeer(pkt->getPeerId());
 848                 return;
 849         }
 850
 851         player->setPosition(position);
 852         player->setSpeed(speed);
 853         player->setPitch(pitch);
 854         player->setYaw(yaw);
 855         player->keyPressed = keyPressed;
 856         player->control.up = (keyPressed & 1);
 857         player->control.down = (keyPressed & 2);
 858         player->control.left = (keyPressed & 4);
 859         player->control.right = (keyPressed & 8);
 860         player->control.jump = (keyPressed & 16);
 861         player->control.aux1 = (keyPressed & 32);
 862         player->control.sneak = (keyPressed & 64);
 863         player->control.LMB = (keyPressed & 128);
 864         player->control.RMB = (keyPressed & 256);
 865
 866         if (playersao->checkMovementCheat()) {
 867                 // Call callbacks
 868                 m_script->on_cheat(playersao, "moved_too_fast");
 869                 SendMovePlayer(pkt->getPeerId());
 870         }
 871 }
 872
 873 void Server::handleCommand_DeletedBlocks(NetworkPacket* pkt)
 874 {
 875         if (pkt->getSize() < 1)
 876                 return;
 877
 878         /*
 879                 [0] u16 command
 880                 [2] u8 count
 881                 [3] v3s16 pos_0
 882                 [3+6] v3s16 pos_1
 883                 ...
 884         */
 885
 886         u8 count;
 887         *pkt >> count;
 888
 889         RemoteClient *client = getClient(pkt->getPeerId());
 890
 891         for (u16 i = 0; i < count; i++) {
 892                 if ((s16)pkt->getSize() < 1 + (i + 1) * 6)
 893                         throw con::InvalidIncomingDataException
 894                                 ("DELETEDBLOCKS length is too short");
 895                 v3s16 p;
 896                 *pkt >> p;
 897
 898                 client->SetBlockNotSent(p);
 899         }
 900 }
 901
 902 void Server::handleCommand_InventoryAction(NetworkPacket* pkt)
 903 {
 904         Player *player = m_env->getPlayer(pkt->getPeerId());
 905         if (player == NULL) {
 906                 errorstream << "Server::ProcessData(): Cancelling: "
 907                                 "No player for peer_id=" << pkt->getPeerId()
 908                                 << " disconnecting peer!" << std::endl;
 909                 m_con.DisconnectPeer(pkt->getPeerId());
 910                 return;
 911         }
 912
 913         PlayerSAO *playersao = player->getPlayerSAO();
 914         if (playersao == NULL) {
 915                 errorstream << "Server::ProcessData(): Cancelling: "
 916                                 "No player object for peer_id=" << pkt->getPeerId()
 917                                 << " disconnecting peer!" << std::endl;
 918                 m_con.DisconnectPeer(pkt->getPeerId());
 919                 return;
 920         }
 921
 922         // Strip command and create a stream
 923         std::string datastring(pkt->getString(0), pkt->getSize());
 924         verbosestream << "TOSERVER_INVENTORY_ACTION: data=" << datastring
 925                 << std::endl;
 926         std::istringstream is(datastring, std::ios_base::binary);
 927         // Create an action
 928         InventoryAction *a = InventoryAction::deSerialize(is);
 929         if (a == NULL) {
 930                 infostream << "TOSERVER_INVENTORY_ACTION: "
 931                                 << "InventoryAction::deSerialize() returned NULL"
 932                                 << std::endl;
 933                 return;
 934         }
 935
 936         // If something goes wrong, this player is to blame
 937         RollbackScopeActor rollback_scope(m_rollback,
 938                         std::string("player:")+player->getName());
 939
 940         /*
 941                 Note: Always set inventory not sent, to repair cases
 942                 where the client made a bad prediction.
 943         */
 944
 945         /*
 946                 Handle restrictions and special cases of the move action
 947         */
 948         if (a->getType() == IACTION_MOVE) {
 949                 IMoveAction *ma = (IMoveAction*)a;
 950
 951                 ma->from_inv.applyCurrentPlayer(player->getName());
 952                 ma->to_inv.applyCurrentPlayer(player->getName());
 953
 954                 setInventoryModified(ma->from_inv);
 955                 setInventoryModified(ma->to_inv);
 956
 957                 bool from_inv_is_current_player =
 958                         (ma->from_inv.type == InventoryLocation::PLAYER) &&
 959                         (ma->from_inv.name == player->getName());
 960
 961                 bool to_inv_is_current_player =
 962                         (ma->to_inv.type == InventoryLocation::PLAYER) &&
 963                         (ma->to_inv.name == player->getName());
 964
 965                 /*
 966                         Disable moving items out of craftpreview
 967                 */
 968                 if (ma->from_list == "craftpreview") {
 969                         infostream << "Ignoring IMoveAction from "
 970                                         << (ma->from_inv.dump()) << ":" << ma->from_list
 971                                         << " to " << (ma->to_inv.dump()) << ":" << ma->to_list
 972                                         << " because src is " << ma->from_list << std::endl;
 973                         delete a;
 974                         return;
 975                 }
 976
 977                 /*
 978                         Disable moving items into craftresult and craftpreview
 979                 */
 980                 if (ma->to_list == "craftpreview" || ma->to_list == "craftresult") {
 981                         infostream << "Ignoring IMoveAction from "
 982                                         << (ma->from_inv.dump()) << ":" << ma->from_list
 983                                         << " to " << (ma->to_inv.dump()) << ":" << ma->to_list
 984                                         << " because dst is " << ma->to_list << std::endl;
 985                         delete a;
 986                         return;
 987                 }
 988
 989                 // Disallow moving items in elsewhere than player's inventory
 990                 // if not allowed to interact
 991                 if (!checkPriv(player->getName(), "interact") &&
 992                                 (!from_inv_is_current_player ||
 993                                 !to_inv_is_current_player)) {
 994                         infostream << "Cannot move outside of player's inventory: "
 995                                         << "No interact privilege" << std::endl;
 996                         delete a;
 997                         return;
 998                 }
 999         }
1000         /*
1001                 Handle restrictions and special cases of the drop action
1002         */
1003         else if (a->getType() == IACTION_DROP) {
1004                 IDropAction *da = (IDropAction*)a;
1005
1006                 da->from_inv.applyCurrentPlayer(player->getName());
1007
1008                 setInventoryModified(da->from_inv);
1009
1010                 /*
1011                         Disable dropping items out of craftpreview
1012                 */
1013                 if (da->from_list == "craftpreview") {
1014                         infostream << "Ignoring IDropAction from "
1015                                         << (da->from_inv.dump()) << ":" << da->from_list
1016                                         << " because src is " << da->from_list << std::endl;
1017                         delete a;
1018                         return;
1019                 }
1020
1021                 // Disallow dropping items if not allowed to interact
1022                 if (!checkPriv(player->getName(), "interact")) {
1023                         delete a;
1024                         return;
1025                 }
1026         }
1027         /*
1028                 Handle restrictions and special cases of the craft action
1029         */
1030         else if (a->getType() == IACTION_CRAFT) {
1031                 ICraftAction *ca = (ICraftAction*)a;
1032
1033                 ca->craft_inv.applyCurrentPlayer(player->getName());
1034
1035                 setInventoryModified(ca->craft_inv);
1036
1037                 //bool craft_inv_is_current_player =
1038                 //      (ca->craft_inv.type == InventoryLocation::PLAYER) &&
1039                 //      (ca->craft_inv.name == player->getName());
1040
1041                 // Disallow crafting if not allowed to interact
1042                 if (!checkPriv(player->getName(), "interact")) {
1043                         infostream << "Cannot craft: "
1044                                         << "No interact privilege" << std::endl;
1045                         delete a;
1046                         return;
1047                 }
1048         }
1049
1050         // Do the action
1051         a->apply(this, playersao, this);
1052         // Eat the action
1053         delete a;
1054 }
1055
1056 void Server::handleCommand_ChatMessage(NetworkPacket* pkt)
1057 {
1058         /*
1059                 u16 command
1060                 u16 length
1061                 wstring message
1062         */
1063         u16 len;
1064         *pkt >> len;
1065
1066         std::wstring message;
1067         for (u16 i = 0; i < len; i++) {
1068                 u16 tmp_wchar;
1069                 *pkt >> tmp_wchar;
1070
1071                 message += (wchar_t)tmp_wchar;
1072         }
1073
1074         Player *player = m_env->getPlayer(pkt->getPeerId());
1075         if (player == NULL) {
1076                 errorstream << "Server::ProcessData(): Cancelling: "
1077                                 "No player for peer_id=" << pkt->getPeerId()
1078                                 << " disconnecting peer!" << std::endl;
1079                 m_con.DisconnectPeer(pkt->getPeerId());
1080                 return;
1081         }
1082
1083         // If something goes wrong, this player is to blame
1084         RollbackScopeActor rollback_scope(m_rollback,
1085                         std::string("player:")+player->getName());
1086
1087         // Get player name of this client
1088         std::wstring name = narrow_to_wide(player->getName());
1089
1090         // Run script hook
1091         bool ate = m_script->on_chat_message(player->getName(),
1092                         wide_to_narrow(message));
1093         // If script ate the message, don't proceed
1094         if (ate)
1095                 return;
1096
1097         // Line to send to players
1098         std::wstring line;
1099         // Whether to send to the player that sent the line
1100         bool send_to_sender_only = false;
1101
1102         // Commands are implemented in Lua, so only catch invalid
1103         // commands that were not "eaten" and send an error back
1104         if (message[0] == L'/') {
1105                 message = message.substr(1);
1106                 send_to_sender_only = true;
1107                 if (message.length() == 0)
1108                         line += L"-!- Empty command";
1109                 else
1110                         line += L"-!- Invalid command: " + str_split(message, L' ')[0];
1111         }
1112         else {
1113                 if (checkPriv(player->getName(), "shout")) {
1114                         line += L"<";
1115                         line += name;
1116                         line += L"> ";
1117                         line += message;
1118                 } else {
1119                         line += L"-!- You don't have permission to shout.";
1120                         send_to_sender_only = true;
1121                 }
1122         }
1123
1124         if (line != L"")
1125         {
1126                 /*
1127                         Send the message to sender
1128                 */
1129                 if (send_to_sender_only) {
1130                         SendChatMessage(pkt->getPeerId(), line);
1131                 }
1132                 /*
1133                         Send the message to others
1134                 */
1135                 else {
1136                         actionstream << "CHAT: " << wide_to_narrow(line)<<std::endl;
1137
1138                         std::vector<u16> clients = m_clients.getClientIDs();
1139
1140                         for (std::vector<u16>::iterator i = clients.begin();
1141                                 i != clients.end(); ++i) {
1142                                 if (*i != pkt->getPeerId())
1143                                         SendChatMessage(*i, line);
1144                         }
1145                 }
1146         }
1147 }
1148
1149 void Server::handleCommand_Damage(NetworkPacket* pkt)
1150 {
1151         u8 damage;
1152
1153         *pkt >> damage;
1154
1155         Player *player = m_env->getPlayer(pkt->getPeerId());
1156         if (player == NULL) {
1157                 errorstream << "Server::ProcessData(): Cancelling: "
1158                                 "No player for peer_id=" << pkt->getPeerId()
1159                                 << " disconnecting peer!" << std::endl;
1160                 m_con.DisconnectPeer(pkt->getPeerId());
1161                 return;
1162         }
1163
1164         PlayerSAO *playersao = player->getPlayerSAO();
1165         if (playersao == NULL) {
1166                 errorstream << "Server::ProcessData(): Cancelling: "
1167                                 "No player object for peer_id=" << pkt->getPeerId()
1168                                 << " disconnecting peer!" << std::endl;
1169                 m_con.DisconnectPeer(pkt->getPeerId());
1170                 return;
1171         }
1172
1173         if (g_settings->getBool("enable_damage")) {
1174                 actionstream << player->getName() << " damaged by "
1175                                 << (int)damage << " hp at " << PP(player->getPosition() / BS)
1176                                 << std::endl;
1177
1178                 playersao->setHP(playersao->getHP() - damage);
1179                 SendPlayerHPOrDie(playersao->getPeerID(), playersao->getHP() == 0);
1180         }
1181 }
1182
1183 void Server::handleCommand_Breath(NetworkPacket* pkt)
1184 {
1185         u16 breath;
1186
1187         *pkt >> breath;
1188
1189         Player *player = m_env->getPlayer(pkt->getPeerId());
1190         if (player == NULL) {
1191                 errorstream << "Server::ProcessData(): Cancelling: "
1192                                 "No player for peer_id=" << pkt->getPeerId()
1193                                 << " disconnecting peer!" << std::endl;
1194                 m_con.DisconnectPeer(pkt->getPeerId());
1195                 return;
1196         }
1197
1198         /*
1199          * If player is dead, we don't need to update the breath
1200          * He is dead !
1201          */
1202         if (player->isDead()) {
1203                 verbosestream << "TOSERVER_BREATH: " << player->getName()
1204                         << " is dead. Ignoring packet";
1205                 return;
1206         }
1207
1208
1209         PlayerSAO *playersao = player->getPlayerSAO();
1210         if (playersao == NULL) {
1211                 errorstream << "Server::ProcessData(): Cancelling: "
1212                                 "No player object for peer_id=" << pkt->getPeerId()
1213                                 << " disconnecting peer!" << std::endl;
1214                 m_con.DisconnectPeer(pkt->getPeerId());
1215                 return;
1216         }
1217
1218         playersao->setBreath(breath);
1219         SendPlayerBreath(pkt->getPeerId());
1220 }
1221
1222 void Server::handleCommand_Password(NetworkPacket* pkt)
1223 {
1224         errorstream << "PAssword packet size: " << pkt->getSize() << " size required: " << PASSWORD_SIZE * 2 << std::endl;
1225         if ((pkt->getCommand() == TOSERVER_PASSWORD && pkt->getSize() < 4) ||
1226                         pkt->getSize() != PASSWORD_SIZE * 2)
1227                 return;
1228
1229         std::string oldpwd;
1230         std::string newpwd;
1231
1232         if (pkt->getCommand() == TOSERVER_PASSWORD) {
1233                 *pkt >> oldpwd >> newpwd;
1234         }
1235         // 13/03/15
1236         // Protocol v24 compat. Please remove in 1 year after
1237         // client convergence to 0.4.13/0.5.x
1238         else {
1239                 for (u16 i = 0; i < PASSWORD_SIZE - 1; i++) {
1240                         char c = pkt->getChar(i);
1241                         if (c == 0)
1242                                 break;
1243                         oldpwd += c;
1244                 }
1245
1246                 for (u16 i = 0; i < PASSWORD_SIZE - 1; i++) {
1247                         char c = pkt->getChar(PASSWORD_SIZE + i);
1248                         if (c == 0)
1249                                 break;
1250                         newpwd += c;
1251                 }
1252         }
1253
1254         Player *player = m_env->getPlayer(pkt->getPeerId());
1255         if (player == NULL) {
1256                 errorstream << "Server::ProcessData(): Cancelling: "
1257                                 "No player for peer_id=" << pkt->getPeerId()
1258                                 << " disconnecting peer!" << std::endl;
1259                 m_con.DisconnectPeer(pkt->getPeerId());
1260                 return;
1261         }
1262
1263         if (!base64_is_valid(newpwd)) {
1264                 infostream<<"Server: " << player->getName() <<
1265                                 " supplied invalid password hash" << std::endl;
1266                 // Wrong old password supplied!!
1267                 SendChatMessage(pkt->getPeerId(), L"Invalid new password hash supplied. Password NOT changed.");
1268                 return;
1269         }
1270
1271         infostream << "Server: Client requests a password change from "
1272                         << "'" << oldpwd << "' to '" << newpwd << "'" << std::endl;
1273
1274         std::string playername = player->getName();
1275
1276         std::string checkpwd;
1277         m_script->getAuth(playername, &checkpwd, NULL);
1278
1279         if (oldpwd != checkpwd) {
1280                 infostream << "Server: invalid old password" << std::endl;
1281                 // Wrong old password supplied!!
1282                 SendChatMessage(pkt->getPeerId(), L"Invalid old password supplied. Password NOT changed.");
1283                 return;
1284         }
1285
1286         bool success = m_script->setPassword(playername, newpwd);
1287         if (success) {
1288                 actionstream << player->getName() << " changes password" << std::endl;
1289                 SendChatMessage(pkt->getPeerId(), L"Password change successful.");
1290         } else {
1291                 actionstream << player->getName() << " tries to change password but "
1292                                 << "it fails" << std::endl;
1293                 SendChatMessage(pkt->getPeerId(), L"Password change failed or inavailable.");
1294         }
1295 }
1296
1297 void Server::handleCommand_PlayerItem(NetworkPacket* pkt)
1298 {
1299         if (pkt->getSize() < 2)
1300                 return;
1301
1302         Player *player = m_env->getPlayer(pkt->getPeerId());
1303         if (player == NULL) {
1304                 errorstream << "Server::ProcessData(): Cancelling: "
1305                                 "No player for peer_id=" << pkt->getPeerId()
1306                                 << " disconnecting peer!" << std::endl;
1307                 m_con.DisconnectPeer(pkt->getPeerId());
1308                 return;
1309         }
1310
1311         PlayerSAO *playersao = player->getPlayerSAO();
1312         if (playersao == NULL) {
1313                 errorstream << "Server::ProcessData(): Cancelling: "
1314                                 "No player object for peer_id=" << pkt->getPeerId()
1315                                 << " disconnecting peer!" << std::endl;
1316                 m_con.DisconnectPeer(pkt->getPeerId());
1317                 return;
1318         }
1319
1320         u16 item;
1321
1322         *pkt >> item;
1323
1324         playersao->setWieldIndex(item);
1325 }
1326
1327 void Server::handleCommand_Respawn(NetworkPacket* pkt)
1328 {
1329         Player *player = m_env->getPlayer(pkt->getPeerId());
1330         if (player == NULL) {
1331                 errorstream << "Server::ProcessData(): Cancelling: "
1332                                 "No player for peer_id=" << pkt->getPeerId()
1333                                 << " disconnecting peer!" << std::endl;
1334                 m_con.DisconnectPeer(pkt->getPeerId());
1335                 return;
1336         }
1337
1338         if (!player->isDead())
1339                 return;
1340
1341         RespawnPlayer(pkt->getPeerId());
1342
1343         actionstream << player->getName() << " respawns at "
1344                         << PP(player->getPosition()/BS) << std::endl;
1345
1346         // ActiveObject is added to environment in AsyncRunStep after
1347         // the previous addition has been succesfully removed
1348 }
1349
1350 void Server::handleCommand_Interact(NetworkPacket* pkt)
1351 {
1352         std::string datastring(pkt->getString(0), pkt->getSize());
1353         std::istringstream is(datastring, std::ios_base::binary);
1354
1355         /*
1356                 [0] u16 command
1357                 [2] u8 action
1358                 [3] u16 item
1359                 [5] u32 length of the next item
1360                 [9] serialized PointedThing
1361                 actions:
1362                 0: start digging (from undersurface) or use
1363                 1: stop digging (all parameters ignored)
1364                 2: digging completed
1365                 3: place block or item (to abovesurface)
1366                 4: use item
1367         */
1368         u8 action = readU8(is);
1369         u16 item_i = readU16(is);
1370         std::istringstream tmp_is(deSerializeLongString(is), std::ios::binary);
1371         PointedThing pointed;
1372         pointed.deSerialize(tmp_is);
1373
1374         verbosestream << "TOSERVER_INTERACT: action=" << (int)action << ", item="
1375                         << item_i << ", pointed=" << pointed.dump() << std::endl;
1376
1377         Player *player = m_env->getPlayer(pkt->getPeerId());
1378         if (player == NULL) {
1379                 errorstream << "Server::ProcessData(): Cancelling: "
1380                                 "No player for peer_id=" << pkt->getPeerId()
1381                                 << " disconnecting peer!" << std::endl;
1382                 m_con.DisconnectPeer(pkt->getPeerId());
1383                 return;
1384         }
1385
1386         PlayerSAO *playersao = player->getPlayerSAO();
1387         if (playersao == NULL) {
1388                 errorstream << "Server::ProcessData(): Cancelling: "
1389                                 "No player object for peer_id=" << pkt->getPeerId()
1390                                 << " disconnecting peer!" << std::endl;
1391                 m_con.DisconnectPeer(pkt->getPeerId());
1392                 return;
1393         }
1394
1395         if (player->isDead()) {
1396                 verbosestream << "TOSERVER_INTERACT: " << player->getName()
1397                         << " is dead. Ignoring packet";
1398                 return;
1399         }
1400
1401         v3f player_pos = playersao->getLastGoodPosition();
1402
1403         // Update wielded item
1404         playersao->setWieldIndex(item_i);
1405
1406         // Get pointed to node (undefined if not POINTEDTYPE_NODE)
1407         v3s16 p_under = pointed.node_undersurface;
1408         v3s16 p_above = pointed.node_abovesurface;
1409
1410         // Get pointed to object (NULL if not POINTEDTYPE_OBJECT)
1411         ServerActiveObject *pointed_object = NULL;
1412         if (pointed.type == POINTEDTHING_OBJECT) {
1413                 pointed_object = m_env->getActiveObject(pointed.object_id);
1414                 if (pointed_object == NULL) {
1415                         verbosestream << "TOSERVER_INTERACT: "
1416                                 "pointed object is NULL" << std::endl;
1417                         return;
1418                 }
1419
1420         }
1421
1422         v3f pointed_pos_under = player_pos;
1423         v3f pointed_pos_above = player_pos;
1424         if (pointed.type == POINTEDTHING_NODE) {
1425                 pointed_pos_under = intToFloat(p_under, BS);
1426                 pointed_pos_above = intToFloat(p_above, BS);
1427         }
1428         else if (pointed.type == POINTEDTHING_OBJECT) {
1429                 pointed_pos_under = pointed_object->getBasePosition();
1430                 pointed_pos_above = pointed_pos_under;
1431         }
1432
1433         /*
1434                 Check that target is reasonably close
1435                 (only when digging or placing things)
1436         */
1437         if (action == 0 || action == 2 || action == 3) {
1438                 float d = player_pos.getDistanceFrom(pointed_pos_under);
1439                 float max_d = BS * 14; // Just some large enough value
1440                 if (d > max_d) {
1441                         actionstream << "Player " << player->getName()
1442                                         << " tried to access " << pointed.dump()
1443                                         << " from too far: "
1444                                         << "d=" << d <<", max_d=" << max_d
1445                                         << ". ignoring." << std::endl;
1446                         // Re-send block to revert change on client-side
1447                         RemoteClient *client = getClient(pkt->getPeerId());
1448                         v3s16 blockpos = getNodeBlockPos(floatToInt(pointed_pos_under, BS));
1449                         client->SetBlockNotSent(blockpos);
1450                         // Call callbacks
1451                         m_script->on_cheat(playersao, "interacted_too_far");
1452                         // Do nothing else
1453                         return;
1454                 }
1455         }
1456
1457         /*
1458                 Make sure the player is allowed to do it
1459         */
1460         if (!checkPriv(player->getName(), "interact")) {
1461                 actionstream<<player->getName()<<" attempted to interact with "
1462                                 <<pointed.dump()<<" without 'interact' privilege"
1463                                 <<std::endl;
1464                 // Re-send block to revert change on client-side
1465                 RemoteClient *client = getClient(pkt->getPeerId());
1466                 // Digging completed -> under
1467                 if (action == 2) {
1468                         v3s16 blockpos = getNodeBlockPos(floatToInt(pointed_pos_under, BS));
1469                         client->SetBlockNotSent(blockpos);
1470                 }
1471                 // Placement -> above
1472                 if (action == 3) {
1473                         v3s16 blockpos = getNodeBlockPos(floatToInt(pointed_pos_above, BS));
1474                         client->SetBlockNotSent(blockpos);
1475                 }
1476                 return;
1477         }
1478
1479         /*
1480                 If something goes wrong, this player is to blame
1481         */
1482         RollbackScopeActor rollback_scope(m_rollback,
1483                         std::string("player:")+player->getName());
1484
1485         /*
1486                 0: start digging or punch object
1487         */
1488         if (action == 0) {
1489                 if (pointed.type == POINTEDTHING_NODE) {
1490                         /*
1491                                 NOTE: This can be used in the future to check if
1492                                 somebody is cheating, by checking the timing.
1493                         */
1494                         MapNode n(CONTENT_IGNORE);
1495                         bool pos_ok;
1496                         n = m_env->getMap().getNodeNoEx(p_under, &pos_ok);
1497                         if (pos_ok)
1498                                 n = m_env->getMap().getNodeNoEx(p_under, &pos_ok);
1499
1500                         if (!pos_ok) {
1501                                 infostream << "Server: Not punching: Node not found."
1502                                                 << " Adding block to emerge queue."
1503                                                 << std::endl;
1504                                 m_emerge->enqueueBlockEmerge(pkt->getPeerId(), getNodeBlockPos(p_above), false);
1505                         }
1506
1507                         if (n.getContent() != CONTENT_IGNORE)
1508                                 m_script->node_on_punch(p_under, n, playersao, pointed);
1509                         // Cheat prevention
1510                         playersao->noCheatDigStart(p_under);
1511                 }
1512                 else if (pointed.type == POINTEDTHING_OBJECT) {
1513                         // Skip if object has been removed
1514                         if (pointed_object->m_removed)
1515                                 return;
1516
1517                         actionstream<<player->getName()<<" punches object "
1518                                         <<pointed.object_id<<": "
1519                                         <<pointed_object->getDescription()<<std::endl;
1520
1521                         ItemStack punchitem = playersao->getWieldedItem();
1522                         ToolCapabilities toolcap =
1523                                         punchitem.getToolCapabilities(m_itemdef);
1524                         v3f dir = (pointed_object->getBasePosition() -
1525                                         (player->getPosition() + player->getEyeOffset())
1526                                                 ).normalize();
1527                         float time_from_last_punch =
1528                                 playersao->resetTimeFromLastPunch();
1529
1530                         s16 src_original_hp = pointed_object->getHP();
1531                         s16 dst_origin_hp = playersao->getHP();
1532
1533                         pointed_object->punch(dir, &toolcap, playersao,
1534                                         time_from_last_punch);
1535
1536                         // If the object is a player and its HP changed
1537                         if (src_original_hp != pointed_object->getHP() &&
1538                                         pointed_object->getType() == ACTIVEOBJECT_TYPE_PLAYER) {
1539                                 SendPlayerHPOrDie(((PlayerSAO*)pointed_object)->getPeerID(),
1540                                                 pointed_object->getHP() == 0);
1541                         }
1542
1543                         // If the puncher is a player and its HP changed
1544                         if (dst_origin_hp != playersao->getHP()) {
1545                                 SendPlayerHPOrDie(playersao->getPeerID(), playersao->getHP() == 0);
1546                         }
1547                 }
1548
1549         } // action == 0
1550
1551         /*
1552                 1: stop digging
1553         */
1554         else if (action == 1) {
1555         } // action == 1
1556
1557         /*
1558                 2: Digging completed
1559         */
1560         else if (action == 2) {
1561                 // Only digging of nodes
1562                 if (pointed.type == POINTEDTHING_NODE) {
1563                         bool pos_ok;
1564                         MapNode n = m_env->getMap().getNodeNoEx(p_under, &pos_ok);
1565                         if (!pos_ok) {
1566                                 infostream << "Server: Not finishing digging: Node not found."
1567                                                    << " Adding block to emerge queue."
1568                                                    << std::endl;
1569                                 m_emerge->enqueueBlockEmerge(pkt->getPeerId(), getNodeBlockPos(p_above), false);
1570                         }
1571
1572                         /* Cheat prevention */
1573                         bool is_valid_dig = true;
1574                         if (!isSingleplayer() && !g_settings->getBool("disable_anticheat")) {
1575                                 v3s16 nocheat_p = playersao->getNoCheatDigPos();
1576                                 float nocheat_t = playersao->getNoCheatDigTime();
1577                                 playersao->noCheatDigEnd();
1578                                 // If player didn't start digging this, ignore dig
1579                                 if (nocheat_p != p_under) {
1580                                         infostream << "Server: NoCheat: " << player->getName()
1581                                                         << " started digging "
1582                                                         << PP(nocheat_p) << " and completed digging "
1583                                                         << PP(p_under) << "; not digging." << std::endl;
1584                                         is_valid_dig = false;
1585                                         // Call callbacks
1586                                         m_script->on_cheat(playersao, "finished_unknown_dig");
1587                                 }
1588                                 // Get player's wielded item
1589                                 ItemStack playeritem;
1590                                 InventoryList *mlist = playersao->getInventory()->getList("main");
1591                                 if (mlist != NULL)
1592                                         playeritem = mlist->getItem(playersao->getWieldIndex());
1593                                 ToolCapabilities playeritem_toolcap =
1594                                                 playeritem.getToolCapabilities(m_itemdef);
1595                                 // Get diggability and expected digging time
1596                                 DigParams params = getDigParams(m_nodedef->get(n).groups,
1597                                                 &playeritem_toolcap);
1598                                 // If can't dig, try hand
1599                                 if (!params.diggable) {
1600                                         const ItemDefinition &hand = m_itemdef->get("");
1601                                         const ToolCapabilities *tp = hand.tool_capabilities;
1602                                         if (tp)
1603                                                 params = getDigParams(m_nodedef->get(n).groups, tp);
1604                                 }
1605                                 // If can't dig, ignore dig
1606                                 if (!params.diggable) {
1607                                         infostream << "Server: NoCheat: " << player->getName()
1608                                                         << " completed digging " << PP(p_under)
1609                                                         << ", which is not diggable with tool. not digging."
1610                                                         << std::endl;
1611                                         is_valid_dig = false;
1612                                         // Call callbacks
1613                                         m_script->on_cheat(playersao, "dug_unbreakable");
1614                                 }
1615                                 // Check digging time
1616                                 // If already invalidated, we don't have to
1617                                 if (!is_valid_dig) {
1618                                         // Well not our problem then
1619                                 }
1620                                 // Clean and long dig
1621                                 else if (params.time > 2.0 && nocheat_t * 1.2 > params.time) {
1622                                         // All is good, but grab time from pool; don't care if
1623                                         // it's actually available
1624                                         playersao->getDigPool().grab(params.time);
1625                                 }
1626                                 // Short or laggy dig
1627                                 // Try getting the time from pool
1628                                 else if (playersao->getDigPool().grab(params.time)) {
1629                                         // All is good
1630                                 }
1631                                 // Dig not possible
1632                                 else {
1633                                         infostream << "Server: NoCheat: " << player->getName()
1634                                                         << " completed digging " << PP(p_under)
1635                                                         << "too fast; not digging." << std::endl;
1636                                         is_valid_dig = false;
1637                                         // Call callbacks
1638                                         m_script->on_cheat(playersao, "dug_too_fast");
1639                                 }
1640                         }
1641
1642                         /* Actually dig node */
1643
1644                         if (is_valid_dig && n.getContent() != CONTENT_IGNORE)
1645                                 m_script->node_on_dig(p_under, n, playersao);
1646
1647                         v3s16 blockpos = getNodeBlockPos(floatToInt(pointed_pos_under, BS));
1648                         RemoteClient *client = getClient(pkt->getPeerId());
1649                         // Send unusual result (that is, node not being removed)
1650                         if (m_env->getMap().getNodeNoEx(p_under).getContent() != CONTENT_AIR) {
1651                                 // Re-send block to revert change on client-side
1652                                 client->SetBlockNotSent(blockpos);
1653                         }
1654                         else {
1655                                 client->ResendBlockIfOnWire(blockpos);
1656                         }
1657                 }
1658         } // action == 2
1659
1660         /*
1661                 3: place block or right-click object
1662         */
1663         else if (action == 3) {
1664                 ItemStack item = playersao->getWieldedItem();
1665
1666                 // Reset build time counter
1667                 if (pointed.type == POINTEDTHING_NODE &&
1668                                 item.getDefinition(m_itemdef).type == ITEM_NODE)
1669                         getClient(pkt->getPeerId())->m_time_from_building = 0.0;
1670
1671                 if (pointed.type == POINTEDTHING_OBJECT) {
1672                         // Right click object
1673
1674                         // Skip if object has been removed
1675                         if (pointed_object->m_removed)
1676                                 return;
1677
1678                         actionstream << player->getName() << " right-clicks object "
1679                                         << pointed.object_id << ": "
1680                                         << pointed_object->getDescription() << std::endl;
1681
1682                         // Do stuff
1683                         pointed_object->rightClick(playersao);
1684                 }
1685                 else if (m_script->item_OnPlace(
1686                                 item, playersao, pointed)) {
1687                         // Placement was handled in lua
1688
1689                         // Apply returned ItemStack
1690                         if (playersao->setWieldedItem(item)) {
1691                                 SendInventory(playersao);
1692                         }
1693                 }
1694
1695                 // If item has node placement prediction, always send the
1696                 // blocks to make sure the client knows what exactly happened
1697                 RemoteClient *client = getClient(pkt->getPeerId());
1698                 v3s16 blockpos = getNodeBlockPos(floatToInt(pointed_pos_above, BS));
1699                 v3s16 blockpos2 = getNodeBlockPos(floatToInt(pointed_pos_under, BS));
1700                 if (item.getDefinition(m_itemdef).node_placement_prediction != "") {
1701                         client->SetBlockNotSent(blockpos);
1702                         if (blockpos2 != blockpos) {
1703                                 client->SetBlockNotSent(blockpos2);
1704                         }
1705                 }
1706                 else {
1707                         client->ResendBlockIfOnWire(blockpos);
1708                         if (blockpos2 != blockpos) {
1709                                 client->ResendBlockIfOnWire(blockpos2);
1710                         }
1711                 }
1712         } // action == 3
1713
1714         /*
1715                 4: use
1716         */
1717         else if (action == 4) {
1718                 ItemStack item = playersao->getWieldedItem();
1719
1720                 actionstream << player->getName() << " uses " << item.name
1721                                 << ", pointing at " << pointed.dump() << std::endl;
1722
1723                 if (m_script->item_OnUse(
1724                                 item, playersao, pointed)) {
1725                         // Apply returned ItemStack
1726                         playersao->setWieldedItem(item);
1727                 }
1728
1729         } // action == 4
1730
1731
1732         /*
1733                 Catch invalid actions
1734         */
1735         else {
1736                 infostream << "WARNING: Server: Invalid action "
1737                                 << action << std::endl;
1738         }
1739 }
1740
1741 void Server::handleCommand_RemovedSounds(NetworkPacket* pkt)
1742 {
1743         u16 num;
1744         *pkt >> num;
1745         for (u16 k = 0; k < num; k++) {
1746                 s32 id;
1747
1748                 *pkt >> id;
1749
1750                 std::map<s32, ServerPlayingSound>::iterator i =
1751                         m_playing_sounds.find(id);
1752
1753                 if (i == m_playing_sounds.end())
1754                         continue;
1755
1756                 ServerPlayingSound &psound = i->second;
1757                 psound.clients.erase(pkt->getPeerId());
1758                 if (psound.clients.empty())
1759                         m_playing_sounds.erase(i++);
1760         }
1761 }
1762
1763 void Server::handleCommand_NodeMetaFields(NetworkPacket* pkt)
1764 {
1765         v3s16 p;
1766         std::string formname;
1767         u16 num;
1768
1769         *pkt >> p >> formname >> num;
1770
1771         std::map<std::string, std::string> fields;
1772         for (u16 k = 0; k < num; k++) {
1773                 std::string fieldname;
1774                 *pkt >> fieldname;
1775                 fields[fieldname] = pkt->readLongString();
1776         }
1777
1778         Player *player = m_env->getPlayer(pkt->getPeerId());
1779         if (player == NULL) {
1780                 errorstream << "Server::ProcessData(): Cancelling: "
1781                                 "No player for peer_id=" << pkt->getPeerId()
1782                                 << " disconnecting peer!" << std::endl;
1783                 m_con.DisconnectPeer(pkt->getPeerId());
1784                 return;
1785         }
1786
1787         PlayerSAO *playersao = player->getPlayerSAO();
1788         if (playersao == NULL) {
1789                 errorstream << "Server::ProcessData(): Cancelling: "
1790                                 "No player object for peer_id=" << pkt->getPeerId()
1791                                 << " disconnecting peer!"  << std::endl;
1792                 m_con.DisconnectPeer(pkt->getPeerId());
1793                 return;
1794         }
1795
1796         // If something goes wrong, this player is to blame
1797         RollbackScopeActor rollback_scope(m_rollback,
1798                         std::string("player:")+player->getName());
1799
1800         // Check the target node for rollback data; leave others unnoticed
1801         RollbackNode rn_old(&m_env->getMap(), p, this);
1802
1803         m_script->node_on_receive_fields(p, formname, fields, playersao);
1804
1805         // Report rollback data
1806         RollbackNode rn_new(&m_env->getMap(), p, this);
1807         if (rollback() && rn_new != rn_old) {
1808                 RollbackAction action;
1809                 action.setSetNode(p, rn_old, rn_new);
1810                 rollback()->reportAction(action);
1811         }
1812 }
1813
1814 void Server::handleCommand_InventoryFields(NetworkPacket* pkt)
1815 {
1816         std::string formname;
1817         u16 num;
1818
1819         *pkt >> formname >> num;
1820
1821         std::map<std::string, std::string> fields;
1822         for (u16 k = 0; k < num; k++) {
1823                 std::string fieldname;
1824                 *pkt >> fieldname;
1825                 fields[fieldname] = pkt->readLongString();
1826         }
1827
1828         Player *player = m_env->getPlayer(pkt->getPeerId());
1829         if (player == NULL) {
1830                 errorstream << "Server::ProcessData(): Canceling: "
1831                                 "No player for peer_id=" << pkt->getPeerId()
1832                                 << " disconnecting peer!" << std::endl;
1833                 m_con.DisconnectPeer(pkt->getPeerId());
1834                 return;
1835         }
1836
1837         PlayerSAO *playersao = player->getPlayerSAO();
1838         if (playersao == NULL) {
1839                 errorstream << "Server::ProcessData(): Canceling: "
1840                                 "No player object for peer_id=" << pkt->getPeerId()
1841                                 << " disconnecting peer!" << std::endl;
1842                 m_con.DisconnectPeer(pkt->getPeerId());
1843                 return;
1844         }
1845
1846         m_script->on_playerReceiveFields(playersao, formname, fields);
1847 }