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(): Canceling: 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                         << "disconnecting 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, reserved;
 760         std::string full_ver;
 761         *pkt >> major_ver >> minor_ver >> patch_ver >> reserved >> full_ver;
 762
 763         m_clients.setClientVersion(
 764                         peer_id, major_ver, minor_ver, patch_ver,
 765                         full_ver);
 766
 767         m_clients.event(peer_id, CSE_SetClientReady);
 768         m_script->on_joinplayer(playersao);
 769 }
 770
 771 void Server::handleCommand_GotBlocks(NetworkPacket* pkt)
 772 {
 773         if (pkt->getSize() < 1)
 774                 return;
 775
 776         /*
 777                 [0] u16 command
 778                 [2] u8 count
 779                 [3] v3s16 pos_0
 780                 [3+6] v3s16 pos_1
 781                 ...
 782         */
 783
 784         u8 count;
 785         *pkt >> count;
 786
 787         RemoteClient *client = getClient(pkt->getPeerId());
 788
 789         for (u16 i = 0; i < count; i++) {
 790                 if ((s16)pkt->getSize() < 1 + (i + 1) * 6)
 791                         throw con::InvalidIncomingDataException
 792                                 ("GOTBLOCKS length is too short");
 793                 v3s16 p;
 794
 795                 *pkt >> p;
 796
 797                 client->GotBlock(p);
 798         }
 799 }
 800
 801 void Server::handleCommand_PlayerPos(NetworkPacket* pkt)
 802 {
 803         if (pkt->getSize() < 12 + 12 + 4 + 4)
 804                 return;
 805
 806         v3s32 ps, ss;
 807         s32 f32pitch, f32yaw;
 808
 809         *pkt >> ps;
 810         *pkt >> ss;
 811         *pkt >> f32pitch;
 812         *pkt >> f32yaw;
 813
 814         f32 pitch = (f32)f32pitch / 100.0;
 815         f32 yaw = (f32)f32yaw / 100.0;
 816         u32 keyPressed = 0;
 817
 818         if (pkt->getSize() >= 12 + 12 + 4 + 4 + 4)
 819                 *pkt >> keyPressed;
 820
 821         v3f position((f32)ps.X / 100.0, (f32)ps.Y / 100.0, (f32)ps.Z / 100.0);
 822         v3f speed((f32)ss.X / 100.0, (f32)ss.Y / 100.0, (f32)ss.Z / 100.0);
 823
 824         pitch = modulo360f(pitch);
 825         yaw = modulo360f(yaw);
 826
 827         Player *player = m_env->getPlayer(pkt->getPeerId());
 828         if (player == NULL) {
 829                 errorstream << "Server::ProcessData(): Canceling: "
 830                                 "No player for peer_id=" << pkt->getPeerId()
 831                                 << " disconnecting peer!" << std::endl;
 832                 m_con.DisconnectPeer(pkt->getPeerId());
 833                 return;
 834         }
 835
 836         // If player is dead we don't care of this packet
 837         if (player->isDead()) {
 838                 verbosestream << "TOSERVER_PLAYERPOS: " << player->getName()
 839                         << " is dead. Ignoring packet";
 840                 return;
 841         }
 842
 843         PlayerSAO *playersao = player->getPlayerSAO();
 844         if (playersao == NULL) {
 845                 errorstream << "Server::ProcessData(): Canceling: "
 846                                 "No player object for peer_id=" << pkt->getPeerId()
 847                                 << " disconnecting peer!" << std::endl;
 848                 m_con.DisconnectPeer(pkt->getPeerId());
 849                 return;
 850         }
 851
 852         player->setPosition(position);
 853         player->setSpeed(speed);
 854         player->setPitch(pitch);
 855         player->setYaw(yaw);
 856         player->keyPressed = keyPressed;
 857         player->control.up = (keyPressed & 1);
 858         player->control.down = (keyPressed & 2);
 859         player->control.left = (keyPressed & 4);
 860         player->control.right = (keyPressed & 8);
 861         player->control.jump = (keyPressed & 16);
 862         player->control.aux1 = (keyPressed & 32);
 863         player->control.sneak = (keyPressed & 64);
 864         player->control.LMB = (keyPressed & 128);
 865         player->control.RMB = (keyPressed & 256);
 866
 867         if (playersao->checkMovementCheat()) {
 868                 // Call callbacks
 869                 m_script->on_cheat(playersao, "moved_too_fast");
 870                 SendMovePlayer(pkt->getPeerId());
 871         }
 872 }
 873
 874 void Server::handleCommand_DeletedBlocks(NetworkPacket* pkt)
 875 {
 876         if (pkt->getSize() < 1)
 877                 return;
 878
 879         /*
 880                 [0] u16 command
 881                 [2] u8 count
 882                 [3] v3s16 pos_0
 883                 [3+6] v3s16 pos_1
 884                 ...
 885         */
 886
 887         u8 count;
 888         *pkt >> count;
 889
 890         RemoteClient *client = getClient(pkt->getPeerId());
 891
 892         for (u16 i = 0; i < count; i++) {
 893                 if ((s16)pkt->getSize() < 1 + (i + 1) * 6)
 894                         throw con::InvalidIncomingDataException
 895                                 ("DELETEDBLOCKS length is too short");
 896                 v3s16 p;
 897                 *pkt >> p;
 898
 899                 client->SetBlockNotSent(p);
 900         }
 901 }
 902
 903 void Server::handleCommand_InventoryAction(NetworkPacket* pkt)
 904 {
 905         Player *player = m_env->getPlayer(pkt->getPeerId());
 906         if (player == NULL) {
 907                 errorstream << "Server::ProcessData(): Canceling: "
 908                                 "No player for peer_id=" << pkt->getPeerId()
 909                                 << " disconnecting peer!" << std::endl;
 910                 m_con.DisconnectPeer(pkt->getPeerId());
 911                 return;
 912         }
 913
 914         PlayerSAO *playersao = player->getPlayerSAO();
 915         if (playersao == NULL) {
 916                 errorstream << "Server::ProcessData(): Canceling: "
 917                                 "No player object for peer_id=" << pkt->getPeerId()
 918                                 << " disconnecting peer!" << std::endl;
 919                 m_con.DisconnectPeer(pkt->getPeerId());
 920                 return;
 921         }
 922
 923         // Strip command and create a stream
 924         std::string datastring(pkt->getString(0), pkt->getSize());
 925         verbosestream << "TOSERVER_INVENTORY_ACTION: data=" << datastring
 926                 << std::endl;
 927         std::istringstream is(datastring, std::ios_base::binary);
 928         // Create an action
 929         InventoryAction *a = InventoryAction::deSerialize(is);
 930         if (a == NULL) {
 931                 infostream << "TOSERVER_INVENTORY_ACTION: "
 932                                 << "InventoryAction::deSerialize() returned NULL"
 933                                 << std::endl;
 934                 return;
 935         }
 936
 937         // If something goes wrong, this player is to blame
 938         RollbackScopeActor rollback_scope(m_rollback,
 939                         std::string("player:")+player->getName());
 940
 941         /*
 942                 Note: Always set inventory not sent, to repair cases
 943                 where the client made a bad prediction.
 944         */
 945
 946         /*
 947                 Handle restrictions and special cases of the move action
 948         */
 949         if (a->getType() == IACTION_MOVE) {
 950                 IMoveAction *ma = (IMoveAction*)a;
 951
 952                 ma->from_inv.applyCurrentPlayer(player->getName());
 953                 ma->to_inv.applyCurrentPlayer(player->getName());
 954
 955                 setInventoryModified(ma->from_inv, false);
 956                 setInventoryModified(ma->to_inv, false);
 957
 958                 bool from_inv_is_current_player =
 959                         (ma->from_inv.type == InventoryLocation::PLAYER) &&
 960                         (ma->from_inv.name == player->getName());
 961
 962                 bool to_inv_is_current_player =
 963                         (ma->to_inv.type == InventoryLocation::PLAYER) &&
 964                         (ma->to_inv.name == player->getName());
 965
 966                 /*
 967                         Disable moving items out of craftpreview
 968                 */
 969                 if (ma->from_list == "craftpreview") {
 970                         infostream << "Ignoring IMoveAction from "
 971                                         << (ma->from_inv.dump()) << ":" << ma->from_list
 972                                         << " to " << (ma->to_inv.dump()) << ":" << ma->to_list
 973                                         << " because src is " << ma->from_list << std::endl;
 974                         delete a;
 975                         return;
 976                 }
 977
 978                 /*
 979                         Disable moving items into craftresult and craftpreview
 980                 */
 981                 if (ma->to_list == "craftpreview" || ma->to_list == "craftresult") {
 982                         infostream << "Ignoring IMoveAction from "
 983                                         << (ma->from_inv.dump()) << ":" << ma->from_list
 984                                         << " to " << (ma->to_inv.dump()) << ":" << ma->to_list
 985                                         << " because dst is " << ma->to_list << std::endl;
 986                         delete a;
 987                         return;
 988                 }
 989
 990                 // Disallow moving items in elsewhere than player's inventory
 991                 // if not allowed to interact
 992                 if (!checkPriv(player->getName(), "interact") &&
 993                                 (!from_inv_is_current_player ||
 994                                 !to_inv_is_current_player)) {
 995                         infostream << "Cannot move outside of player's inventory: "
 996                                         << "No interact privilege" << std::endl;
 997                         delete a;
 998                         return;
 999                 }
1000         }
1001         /*
1002                 Handle restrictions and special cases of the drop action
1003         */
1004         else if (a->getType() == IACTION_DROP) {
1005                 IDropAction *da = (IDropAction*)a;
1006
1007                 da->from_inv.applyCurrentPlayer(player->getName());
1008
1009                 setInventoryModified(da->from_inv, false);
1010
1011                 /*
1012                         Disable dropping items out of craftpreview
1013                 */
1014                 if (da->from_list == "craftpreview") {
1015                         infostream << "Ignoring IDropAction from "
1016                                         << (da->from_inv.dump()) << ":" << da->from_list
1017                                         << " because src is " << da->from_list << std::endl;
1018                         delete a;
1019                         return;
1020                 }
1021
1022                 // Disallow dropping items if not allowed to interact
1023                 if (!checkPriv(player->getName(), "interact")) {
1024                         delete a;
1025                         return;
1026                 }
1027         }
1028         /*
1029                 Handle restrictions and special cases of the craft action
1030         */
1031         else if (a->getType() == IACTION_CRAFT) {
1032                 ICraftAction *ca = (ICraftAction*)a;
1033
1034                 ca->craft_inv.applyCurrentPlayer(player->getName());
1035
1036                 setInventoryModified(ca->craft_inv, false);
1037
1038                 //bool craft_inv_is_current_player =
1039                 //      (ca->craft_inv.type == InventoryLocation::PLAYER) &&
1040                 //      (ca->craft_inv.name == player->getName());
1041
1042                 // Disallow crafting if not allowed to interact
1043                 if (!checkPriv(player->getName(), "interact")) {
1044                         infostream << "Cannot craft: "
1045                                         << "No interact privilege" << std::endl;
1046                         delete a;
1047                         return;
1048                 }
1049         }
1050
1051         // Do the action
1052         a->apply(this, playersao, this);
1053         // Eat the action
1054         delete a;
1055
1056         SendInventory(playersao);
1057 }
1058
1059 void Server::handleCommand_ChatMessage(NetworkPacket* pkt)
1060 {
1061         /*
1062                 u16 command
1063                 u16 length
1064                 wstring message
1065         */
1066         u16 len;
1067         *pkt >> len;
1068
1069         std::wstring message;
1070         for (u16 i = 0; i < len; i++) {
1071                 u16 tmp_wchar;
1072                 *pkt >> tmp_wchar;
1073
1074                 message += (wchar_t)tmp_wchar;
1075         }
1076
1077         Player *player = m_env->getPlayer(pkt->getPeerId());
1078         if (player == NULL) {
1079                 errorstream << "Server::ProcessData(): Canceling: "
1080                                 "No player for peer_id=" << pkt->getPeerId()
1081                                 << " disconnecting peer!" << std::endl;
1082                 m_con.DisconnectPeer(pkt->getPeerId());
1083                 return;
1084         }
1085
1086         // If something goes wrong, this player is to blame
1087         RollbackScopeActor rollback_scope(m_rollback,
1088                         std::string("player:")+player->getName());
1089
1090         // Get player name of this client
1091         std::wstring name = narrow_to_wide(player->getName());
1092
1093         // Run script hook
1094         bool ate = m_script->on_chat_message(player->getName(),
1095                         wide_to_narrow(message));
1096         // If script ate the message, don't proceed
1097         if (ate)
1098                 return;
1099
1100         // Line to send to players
1101         std::wstring line;
1102         // Whether to send to the player that sent the line
1103         bool send_to_sender_only = false;
1104
1105         // Commands are implemented in Lua, so only catch invalid
1106         // commands that were not "eaten" and send an error back
1107         if (message[0] == L'/') {
1108                 message = message.substr(1);
1109                 send_to_sender_only = true;
1110                 if (message.length() == 0)
1111                         line += L"-!- Empty command";
1112                 else
1113                         line += L"-!- Invalid command: " + str_split(message, L' ')[0];
1114         }
1115         else {
1116                 if (checkPriv(player->getName(), "shout")) {
1117                         line += L"<";
1118                         line += name;
1119                         line += L"> ";
1120                         line += message;
1121                 } else {
1122                         line += L"-!- You don't have permission to shout.";
1123                         send_to_sender_only = true;
1124                 }
1125         }
1126
1127         if (line != L"")
1128         {
1129                 /*
1130                         Send the message to sender
1131                 */
1132                 if (send_to_sender_only) {
1133                         SendChatMessage(pkt->getPeerId(), line);
1134                 }
1135                 /*
1136                         Send the message to others
1137                 */
1138                 else {
1139                         actionstream << "CHAT: " << wide_to_narrow(line)<<std::endl;
1140
1141                         std::vector<u16> clients = m_clients.getClientIDs();
1142
1143                         for (std::vector<u16>::iterator i = clients.begin();
1144                                 i != clients.end(); ++i) {
1145                                 if (*i != pkt->getPeerId())
1146                                         SendChatMessage(*i, line);
1147                         }
1148                 }
1149         }
1150 }
1151
1152 void Server::handleCommand_Damage(NetworkPacket* pkt)
1153 {
1154         u8 damage;
1155
1156         *pkt >> damage;
1157
1158         Player *player = m_env->getPlayer(pkt->getPeerId());
1159         if (player == NULL) {
1160                 errorstream << "Server::ProcessData(): Canceling: "
1161                                 "No player for peer_id=" << pkt->getPeerId()
1162                                 << " disconnecting peer!" << std::endl;
1163                 m_con.DisconnectPeer(pkt->getPeerId());
1164                 return;
1165         }
1166
1167         PlayerSAO *playersao = player->getPlayerSAO();
1168         if (playersao == NULL) {
1169                 errorstream << "Server::ProcessData(): Canceling: "
1170                                 "No player object for peer_id=" << pkt->getPeerId()
1171                                 << " disconnecting peer!" << std::endl;
1172                 m_con.DisconnectPeer(pkt->getPeerId());
1173                 return;
1174         }
1175
1176         if (g_settings->getBool("enable_damage")) {
1177                 actionstream << player->getName() << " damaged by "
1178                                 << (int)damage << " hp at " << PP(player->getPosition() / BS)
1179                                 << std::endl;
1180
1181                 playersao->setHP(playersao->getHP() - damage);
1182                 SendPlayerHPOrDie(playersao->getPeerID(), playersao->getHP() == 0);
1183         }
1184 }
1185
1186 void Server::handleCommand_Breath(NetworkPacket* pkt)
1187 {
1188         u16 breath;
1189
1190         *pkt >> breath;
1191
1192         Player *player = m_env->getPlayer(pkt->getPeerId());
1193         if (player == NULL) {
1194                 errorstream << "Server::ProcessData(): Canceling: "
1195                                 "No player for peer_id=" << pkt->getPeerId()
1196                                 << " disconnecting peer!" << std::endl;
1197                 m_con.DisconnectPeer(pkt->getPeerId());
1198                 return;
1199         }
1200
1201         /*
1202          * If player is dead, we don't need to update the breath
1203          * He is dead !
1204          */
1205         if (player->isDead()) {
1206                 verbosestream << "TOSERVER_BREATH: " << player->getName()
1207                         << " is dead. Ignoring packet";
1208                 return;
1209         }
1210
1211
1212         PlayerSAO *playersao = player->getPlayerSAO();
1213         if (playersao == NULL) {
1214                 errorstream << "Server::ProcessData(): Canceling: "
1215                                 "No player object for peer_id=" << pkt->getPeerId()
1216                                 << " disconnecting peer!" << std::endl;
1217                 m_con.DisconnectPeer(pkt->getPeerId());
1218                 return;
1219         }
1220
1221         playersao->setBreath(breath);
1222         SendPlayerBreath(pkt->getPeerId());
1223 }
1224
1225 void Server::handleCommand_Password(NetworkPacket* pkt)
1226 {
1227         errorstream << "PAssword packet size: " << pkt->getSize() << " size required: " << PASSWORD_SIZE * 2 << std::endl;
1228         if ((pkt->getCommand() == TOSERVER_PASSWORD && pkt->getSize() < 4) ||
1229                         pkt->getSize() != PASSWORD_SIZE * 2)
1230                 return;
1231
1232         std::string oldpwd;
1233         std::string newpwd;
1234
1235         if (pkt->getCommand() == TOSERVER_PASSWORD) {
1236                 *pkt >> oldpwd >> newpwd;
1237         }
1238         // 13/03/15
1239         // Protocol v24 compat. Please remove in 1 year after
1240         // client convergence to 0.4.13/0.5.x
1241         else {
1242                 for (u16 i = 0; i < PASSWORD_SIZE - 1; i++) {
1243                         char c = pkt->getChar(i);
1244                         if (c == 0)
1245                                 break;
1246                         oldpwd += c;
1247                 }
1248
1249                 for (u16 i = 0; i < PASSWORD_SIZE - 1; i++) {
1250                         char c = pkt->getChar(PASSWORD_SIZE + i);
1251                         if (c == 0)
1252                                 break;
1253                         newpwd += c;
1254                 }
1255         }
1256
1257         Player *player = m_env->getPlayer(pkt->getPeerId());
1258         if (player == NULL) {
1259                 errorstream << "Server::ProcessData(): Canceling: "
1260                                 "No player for peer_id=" << pkt->getPeerId()
1261                                 << " disconnecting peer!" << std::endl;
1262                 m_con.DisconnectPeer(pkt->getPeerId());
1263                 return;
1264         }
1265
1266         if (!base64_is_valid(newpwd)) {
1267                 infostream<<"Server: " << player->getName() <<
1268                                 " supplied invalid password hash" << std::endl;
1269                 // Wrong old password supplied!!
1270                 SendChatMessage(pkt->getPeerId(), L"Invalid new password hash supplied. Password NOT changed.");
1271                 return;
1272         }
1273
1274         infostream << "Server: Client requests a password change from "
1275                         << "'" << oldpwd << "' to '" << newpwd << "'" << std::endl;
1276
1277         std::string playername = player->getName();
1278
1279         std::string checkpwd;
1280         m_script->getAuth(playername, &checkpwd, NULL);
1281
1282         if (oldpwd != checkpwd) {
1283                 infostream << "Server: invalid old password" << std::endl;
1284                 // Wrong old password supplied!!
1285                 SendChatMessage(pkt->getPeerId(), L"Invalid old password supplied. Password NOT changed.");
1286                 return;
1287         }
1288
1289         bool success = m_script->setPassword(playername, newpwd);
1290         if (success) {
1291                 actionstream << player->getName() << " changes password" << std::endl;
1292                 SendChatMessage(pkt->getPeerId(), L"Password change successful.");
1293         } else {
1294                 actionstream << player->getName() << " tries to change password but "
1295                                 << "it fails" << std::endl;
1296                 SendChatMessage(pkt->getPeerId(), L"Password change failed or unavailable.");
1297         }
1298 }
1299
1300 void Server::handleCommand_PlayerItem(NetworkPacket* pkt)
1301 {
1302         if (pkt->getSize() < 2)
1303                 return;
1304
1305         Player *player = m_env->getPlayer(pkt->getPeerId());
1306         if (player == NULL) {
1307                 errorstream << "Server::ProcessData(): Canceling: "
1308                                 "No player for peer_id=" << pkt->getPeerId()
1309                                 << " disconnecting peer!" << std::endl;
1310                 m_con.DisconnectPeer(pkt->getPeerId());
1311                 return;
1312         }
1313
1314         PlayerSAO *playersao = player->getPlayerSAO();
1315         if (playersao == NULL) {
1316                 errorstream << "Server::ProcessData(): Canceling: "
1317                                 "No player object for peer_id=" << pkt->getPeerId()
1318                                 << " disconnecting peer!" << std::endl;
1319                 m_con.DisconnectPeer(pkt->getPeerId());
1320                 return;
1321         }
1322
1323         u16 item;
1324
1325         *pkt >> item;
1326
1327         playersao->setWieldIndex(item);
1328 }
1329
1330 void Server::handleCommand_Respawn(NetworkPacket* pkt)
1331 {
1332         Player *player = m_env->getPlayer(pkt->getPeerId());
1333         if (player == NULL) {
1334                 errorstream << "Server::ProcessData(): Canceling: "
1335                                 "No player for peer_id=" << pkt->getPeerId()
1336                                 << " disconnecting peer!" << std::endl;
1337                 m_con.DisconnectPeer(pkt->getPeerId());
1338                 return;
1339         }
1340
1341         if (!player->isDead())
1342                 return;
1343
1344         RespawnPlayer(pkt->getPeerId());
1345
1346         actionstream << player->getName() << " respawns at "
1347                         << PP(player->getPosition()/BS) << std::endl;
1348
1349         // ActiveObject is added to environment in AsyncRunStep after
1350         // the previous addition has been successfully removed
1351 }
1352
1353 void Server::handleCommand_Interact(NetworkPacket* pkt)
1354 {
1355         std::string datastring(pkt->getString(0), pkt->getSize());
1356         std::istringstream is(datastring, std::ios_base::binary);
1357
1358         /*
1359                 [0] u16 command
1360                 [2] u8 action
1361                 [3] u16 item
1362                 [5] u32 length of the next item
1363                 [9] serialized PointedThing
1364                 actions:
1365                 0: start digging (from undersurface) or use
1366                 1: stop digging (all parameters ignored)
1367                 2: digging completed
1368                 3: place block or item (to abovesurface)
1369                 4: use item
1370         */
1371         u8 action = readU8(is);
1372         u16 item_i = readU16(is);
1373         std::istringstream tmp_is(deSerializeLongString(is), std::ios::binary);
1374         PointedThing pointed;
1375         pointed.deSerialize(tmp_is);
1376
1377         verbosestream << "TOSERVER_INTERACT: action=" << (int)action << ", item="
1378                         << item_i << ", pointed=" << pointed.dump() << std::endl;
1379
1380         Player *player = m_env->getPlayer(pkt->getPeerId());
1381         if (player == NULL) {
1382                 errorstream << "Server::ProcessData(): Canceling: "
1383                                 "No player for peer_id=" << pkt->getPeerId()
1384                                 << " disconnecting peer!" << std::endl;
1385                 m_con.DisconnectPeer(pkt->getPeerId());
1386                 return;
1387         }
1388
1389         PlayerSAO *playersao = player->getPlayerSAO();
1390         if (playersao == NULL) {
1391                 errorstream << "Server::ProcessData(): Canceling: "
1392                                 "No player object for peer_id=" << pkt->getPeerId()
1393                                 << " disconnecting peer!" << std::endl;
1394                 m_con.DisconnectPeer(pkt->getPeerId());
1395                 return;
1396         }
1397
1398         if (player->isDead()) {
1399                 verbosestream << "TOSERVER_INTERACT: " << player->getName()
1400                         << " is dead. Ignoring packet";
1401                 return;
1402         }
1403
1404         v3f player_pos = playersao->getLastGoodPosition();
1405
1406         // Update wielded item
1407         playersao->setWieldIndex(item_i);
1408
1409         // Get pointed to node (undefined if not POINTEDTYPE_NODE)
1410         v3s16 p_under = pointed.node_undersurface;
1411         v3s16 p_above = pointed.node_abovesurface;
1412
1413         // Get pointed to object (NULL if not POINTEDTYPE_OBJECT)
1414         ServerActiveObject *pointed_object = NULL;
1415         if (pointed.type == POINTEDTHING_OBJECT) {
1416                 pointed_object = m_env->getActiveObject(pointed.object_id);
1417                 if (pointed_object == NULL) {
1418                         verbosestream << "TOSERVER_INTERACT: "
1419                                 "pointed object is NULL" << std::endl;
1420                         return;
1421                 }
1422
1423         }
1424
1425         v3f pointed_pos_under = player_pos;
1426         v3f pointed_pos_above = player_pos;
1427         if (pointed.type == POINTEDTHING_NODE) {
1428                 pointed_pos_under = intToFloat(p_under, BS);
1429                 pointed_pos_above = intToFloat(p_above, BS);
1430         }
1431         else if (pointed.type == POINTEDTHING_OBJECT) {
1432                 pointed_pos_under = pointed_object->getBasePosition();
1433                 pointed_pos_above = pointed_pos_under;
1434         }
1435
1436         /*
1437                 Check that target is reasonably close
1438                 (only when digging or placing things)
1439         */
1440         if (action == 0 || action == 2 || action == 3) {
1441                 float d = player_pos.getDistanceFrom(pointed_pos_under);
1442                 float max_d = BS * 14; // Just some large enough value
1443                 if (d > max_d) {
1444                         actionstream << "Player " << player->getName()
1445                                         << " tried to access " << pointed.dump()
1446                                         << " from too far: "
1447                                         << "d=" << d <<", max_d=" << max_d
1448                                         << ". ignoring." << std::endl;
1449                         // Re-send block to revert change on client-side
1450                         RemoteClient *client = getClient(pkt->getPeerId());
1451                         v3s16 blockpos = getNodeBlockPos(floatToInt(pointed_pos_under, BS));
1452                         client->SetBlockNotSent(blockpos);
1453                         // Call callbacks
1454                         m_script->on_cheat(playersao, "interacted_too_far");
1455                         // Do nothing else
1456                         return;
1457                 }
1458         }
1459
1460         /*
1461                 Make sure the player is allowed to do it
1462         */
1463         if (!checkPriv(player->getName(), "interact")) {
1464                 actionstream<<player->getName()<<" attempted to interact with "
1465                                 <<pointed.dump()<<" without 'interact' privilege"
1466                                 <<std::endl;
1467                 // Re-send block to revert change on client-side
1468                 RemoteClient *client = getClient(pkt->getPeerId());
1469                 // Digging completed -> under
1470                 if (action == 2) {
1471                         v3s16 blockpos = getNodeBlockPos(floatToInt(pointed_pos_under, BS));
1472                         client->SetBlockNotSent(blockpos);
1473                 }
1474                 // Placement -> above
1475                 if (action == 3) {
1476                         v3s16 blockpos = getNodeBlockPos(floatToInt(pointed_pos_above, BS));
1477                         client->SetBlockNotSent(blockpos);
1478                 }
1479                 return;
1480         }
1481
1482         /*
1483                 If something goes wrong, this player is to blame
1484         */
1485         RollbackScopeActor rollback_scope(m_rollback,
1486                         std::string("player:")+player->getName());
1487
1488         /*
1489                 0: start digging or punch object
1490         */
1491         if (action == 0) {
1492                 if (pointed.type == POINTEDTHING_NODE) {
1493                         /*
1494                                 NOTE: This can be used in the future to check if
1495                                 somebody is cheating, by checking the timing.
1496                         */
1497                         MapNode n(CONTENT_IGNORE);
1498                         bool pos_ok;
1499                         n = m_env->getMap().getNodeNoEx(p_under, &pos_ok);
1500                         if (pos_ok)
1501                                 n = m_env->getMap().getNodeNoEx(p_under, &pos_ok);
1502
1503                         if (!pos_ok) {
1504                                 infostream << "Server: Not punching: Node not found."
1505                                                 << " Adding block to emerge queue."
1506                                                 << std::endl;
1507                                 m_emerge->enqueueBlockEmerge(pkt->getPeerId(), getNodeBlockPos(p_above), false);
1508                         }
1509
1510                         if (n.getContent() != CONTENT_IGNORE)
1511                                 m_script->node_on_punch(p_under, n, playersao, pointed);
1512                         // Cheat prevention
1513                         playersao->noCheatDigStart(p_under);
1514                 }
1515                 else if (pointed.type == POINTEDTHING_OBJECT) {
1516                         // Skip if object has been removed
1517                         if (pointed_object->m_removed)
1518                                 return;
1519
1520                         actionstream<<player->getName()<<" punches object "
1521                                         <<pointed.object_id<<": "
1522                                         <<pointed_object->getDescription()<<std::endl;
1523
1524                         ItemStack punchitem = playersao->getWieldedItem();
1525                         ToolCapabilities toolcap =
1526                                         punchitem.getToolCapabilities(m_itemdef);
1527                         v3f dir = (pointed_object->getBasePosition() -
1528                                         (player->getPosition() + player->getEyeOffset())
1529                                                 ).normalize();
1530                         float time_from_last_punch =
1531                                 playersao->resetTimeFromLastPunch();
1532
1533                         s16 src_original_hp = pointed_object->getHP();
1534                         s16 dst_origin_hp = playersao->getHP();
1535
1536                         pointed_object->punch(dir, &toolcap, playersao,
1537                                         time_from_last_punch);
1538
1539                         // If the object is a player and its HP changed
1540                         if (src_original_hp != pointed_object->getHP() &&
1541                                         pointed_object->getType() == ACTIVEOBJECT_TYPE_PLAYER) {
1542                                 SendPlayerHPOrDie(((PlayerSAO*)pointed_object)->getPeerID(),
1543                                                 pointed_object->getHP() == 0);
1544                         }
1545
1546                         // If the puncher is a player and its HP changed
1547                         if (dst_origin_hp != playersao->getHP()) {
1548                                 SendPlayerHPOrDie(playersao->getPeerID(), playersao->getHP() == 0);
1549                         }
1550                 }
1551
1552         } // action == 0
1553
1554         /*
1555                 1: stop digging
1556         */
1557         else if (action == 1) {
1558         } // action == 1
1559
1560         /*
1561                 2: Digging completed
1562         */
1563         else if (action == 2) {
1564                 // Only digging of nodes
1565                 if (pointed.type == POINTEDTHING_NODE) {
1566                         bool pos_ok;
1567                         MapNode n = m_env->getMap().getNodeNoEx(p_under, &pos_ok);
1568                         if (!pos_ok) {
1569                                 infostream << "Server: Not finishing digging: Node not found."
1570                                                    << " Adding block to emerge queue."
1571                                                    << std::endl;
1572                                 m_emerge->enqueueBlockEmerge(pkt->getPeerId(), getNodeBlockPos(p_above), false);
1573                         }
1574
1575                         /* Cheat prevention */
1576                         bool is_valid_dig = true;
1577                         if (!isSingleplayer() && !g_settings->getBool("disable_anticheat")) {
1578                                 v3s16 nocheat_p = playersao->getNoCheatDigPos();
1579                                 float nocheat_t = playersao->getNoCheatDigTime();
1580                                 playersao->noCheatDigEnd();
1581                                 // If player didn't start digging this, ignore dig
1582                                 if (nocheat_p != p_under) {
1583                                         infostream << "Server: NoCheat: " << player->getName()
1584                                                         << " started digging "
1585                                                         << PP(nocheat_p) << " and completed digging "
1586                                                         << PP(p_under) << "; not digging." << std::endl;
1587                                         is_valid_dig = false;
1588                                         // Call callbacks
1589                                         m_script->on_cheat(playersao, "finished_unknown_dig");
1590                                 }
1591                                 // Get player's wielded item
1592                                 ItemStack playeritem;
1593                                 InventoryList *mlist = playersao->getInventory()->getList("main");
1594                                 if (mlist != NULL)
1595                                         playeritem = mlist->getItem(playersao->getWieldIndex());
1596                                 ToolCapabilities playeritem_toolcap =
1597                                                 playeritem.getToolCapabilities(m_itemdef);
1598                                 // Get diggability and expected digging time
1599                                 DigParams params = getDigParams(m_nodedef->get(n).groups,
1600                                                 &playeritem_toolcap);
1601                                 // If can't dig, try hand
1602                                 if (!params.diggable) {
1603                                         const ItemDefinition &hand = m_itemdef->get("");
1604                                         const ToolCapabilities *tp = hand.tool_capabilities;
1605                                         if (tp)
1606                                                 params = getDigParams(m_nodedef->get(n).groups, tp);
1607                                 }
1608                                 // If can't dig, ignore dig
1609                                 if (!params.diggable) {
1610                                         infostream << "Server: NoCheat: " << player->getName()
1611                                                         << " completed digging " << PP(p_under)
1612                                                         << ", which is not diggable with tool. not digging."
1613                                                         << std::endl;
1614                                         is_valid_dig = false;
1615                                         // Call callbacks
1616                                         m_script->on_cheat(playersao, "dug_unbreakable");
1617                                 }
1618                                 // Check digging time
1619                                 // If already invalidated, we don't have to
1620                                 if (!is_valid_dig) {
1621                                         // Well not our problem then
1622                                 }
1623                                 // Clean and long dig
1624                                 else if (params.time > 2.0 && nocheat_t * 1.2 > params.time) {
1625                                         // All is good, but grab time from pool; don't care if
1626                                         // it's actually available
1627                                         playersao->getDigPool().grab(params.time);
1628                                 }
1629                                 // Short or laggy dig
1630                                 // Try getting the time from pool
1631                                 else if (playersao->getDigPool().grab(params.time)) {
1632                                         // All is good
1633                                 }
1634                                 // Dig not possible
1635                                 else {
1636                                         infostream << "Server: NoCheat: " << player->getName()
1637                                                         << " completed digging " << PP(p_under)
1638                                                         << "too fast; not digging." << std::endl;
1639                                         is_valid_dig = false;
1640                                         // Call callbacks
1641                                         m_script->on_cheat(playersao, "dug_too_fast");
1642                                 }
1643                         }
1644
1645                         /* Actually dig node */
1646
1647                         if (is_valid_dig && n.getContent() != CONTENT_IGNORE)
1648                                 m_script->node_on_dig(p_under, n, playersao);
1649
1650                         v3s16 blockpos = getNodeBlockPos(floatToInt(pointed_pos_under, BS));
1651                         RemoteClient *client = getClient(pkt->getPeerId());
1652                         // Send unusual result (that is, node not being removed)
1653                         if (m_env->getMap().getNodeNoEx(p_under).getContent() != CONTENT_AIR) {
1654                                 // Re-send block to revert change on client-side
1655                                 client->SetBlockNotSent(blockpos);
1656                         }
1657                         else {
1658                                 client->ResendBlockIfOnWire(blockpos);
1659                         }
1660                 }
1661         } // action == 2
1662
1663         /*
1664                 3: place block or right-click object
1665         */
1666         else if (action == 3) {
1667                 ItemStack item = playersao->getWieldedItem();
1668
1669                 // Reset build time counter
1670                 if (pointed.type == POINTEDTHING_NODE &&
1671                                 item.getDefinition(m_itemdef).type == ITEM_NODE)
1672                         getClient(pkt->getPeerId())->m_time_from_building = 0.0;
1673
1674                 if (pointed.type == POINTEDTHING_OBJECT) {
1675                         // Right click object
1676
1677                         // Skip if object has been removed
1678                         if (pointed_object->m_removed)
1679                                 return;
1680
1681                         actionstream << player->getName() << " right-clicks object "
1682                                         << pointed.object_id << ": "
1683                                         << pointed_object->getDescription() << std::endl;
1684
1685                         // Do stuff
1686                         pointed_object->rightClick(playersao);
1687                 }
1688                 else if (m_script->item_OnPlace(
1689                                 item, playersao, pointed)) {
1690                         // Placement was handled in lua
1691
1692                         // Apply returned ItemStack
1693                         if (playersao->setWieldedItem(item)) {
1694                                 SendInventory(playersao);
1695                         }
1696                 }
1697
1698                 // If item has node placement prediction, always send the
1699                 // blocks to make sure the client knows what exactly happened
1700                 RemoteClient *client = getClient(pkt->getPeerId());
1701                 v3s16 blockpos = getNodeBlockPos(floatToInt(pointed_pos_above, BS));
1702                 v3s16 blockpos2 = getNodeBlockPos(floatToInt(pointed_pos_under, BS));
1703                 if (item.getDefinition(m_itemdef).node_placement_prediction != "") {
1704                         client->SetBlockNotSent(blockpos);
1705                         if (blockpos2 != blockpos) {
1706                                 client->SetBlockNotSent(blockpos2);
1707                         }
1708                 }
1709                 else {
1710                         client->ResendBlockIfOnWire(blockpos);
1711                         if (blockpos2 != blockpos) {
1712                                 client->ResendBlockIfOnWire(blockpos2);
1713                         }
1714                 }
1715         } // action == 3
1716
1717         /*
1718                 4: use
1719         */
1720         else if (action == 4) {
1721                 ItemStack item = playersao->getWieldedItem();
1722
1723                 actionstream << player->getName() << " uses " << item.name
1724                                 << ", pointing at " << pointed.dump() << std::endl;
1725
1726                 if (m_script->item_OnUse(
1727                                 item, playersao, pointed)) {
1728                         // Apply returned ItemStack
1729                         if (playersao->setWieldedItem(item)) {
1730                                 SendInventory(playersao);
1731                         }
1732                 }
1733
1734         } // action == 4
1735
1736
1737         /*
1738                 Catch invalid actions
1739         */
1740         else {
1741                 infostream << "WARNING: Server: Invalid action "
1742                                 << action << std::endl;
1743         }
1744 }
1745
1746 void Server::handleCommand_RemovedSounds(NetworkPacket* pkt)
1747 {
1748         u16 num;
1749         *pkt >> num;
1750         for (u16 k = 0; k < num; k++) {
1751                 s32 id;
1752
1753                 *pkt >> id;
1754
1755                 std::map<s32, ServerPlayingSound>::iterator i =
1756                         m_playing_sounds.find(id);
1757
1758                 if (i == m_playing_sounds.end())
1759                         continue;
1760
1761                 ServerPlayingSound &psound = i->second;
1762                 psound.clients.erase(pkt->getPeerId());
1763                 if (psound.clients.empty())
1764                         m_playing_sounds.erase(i++);
1765         }
1766 }
1767
1768 void Server::handleCommand_NodeMetaFields(NetworkPacket* pkt)
1769 {
1770         v3s16 p;
1771         std::string formname;
1772         u16 num;
1773
1774         *pkt >> p >> formname >> num;
1775
1776         std::map<std::string, std::string> fields;
1777         for (u16 k = 0; k < num; k++) {
1778                 std::string fieldname;
1779                 *pkt >> fieldname;
1780                 fields[fieldname] = pkt->readLongString();
1781         }
1782
1783         Player *player = m_env->getPlayer(pkt->getPeerId());
1784         if (player == NULL) {
1785                 errorstream << "Server::ProcessData(): Canceling: "
1786                                 "No player for peer_id=" << pkt->getPeerId()
1787                                 << " disconnecting peer!" << std::endl;
1788                 m_con.DisconnectPeer(pkt->getPeerId());
1789                 return;
1790         }
1791
1792         PlayerSAO *playersao = player->getPlayerSAO();
1793         if (playersao == NULL) {
1794                 errorstream << "Server::ProcessData(): Canceling: "
1795                                 "No player object for peer_id=" << pkt->getPeerId()
1796                                 << " disconnecting peer!"  << std::endl;
1797                 m_con.DisconnectPeer(pkt->getPeerId());
1798                 return;
1799         }
1800
1801         // If something goes wrong, this player is to blame
1802         RollbackScopeActor rollback_scope(m_rollback,
1803                         std::string("player:")+player->getName());
1804
1805         // Check the target node for rollback data; leave others unnoticed
1806         RollbackNode rn_old(&m_env->getMap(), p, this);
1807
1808         m_script->node_on_receive_fields(p, formname, fields, playersao);
1809
1810         // Report rollback data
1811         RollbackNode rn_new(&m_env->getMap(), p, this);
1812         if (rollback() && rn_new != rn_old) {
1813                 RollbackAction action;
1814                 action.setSetNode(p, rn_old, rn_new);
1815                 rollback()->reportAction(action);
1816         }
1817 }
1818
1819 void Server::handleCommand_InventoryFields(NetworkPacket* pkt)
1820 {
1821         std::string formname;
1822         u16 num;
1823
1824         *pkt >> formname >> num;
1825
1826         std::map<std::string, std::string> fields;
1827         for (u16 k = 0; k < num; k++) {
1828                 std::string fieldname;
1829                 *pkt >> fieldname;
1830                 fields[fieldname] = pkt->readLongString();
1831         }
1832
1833         Player *player = m_env->getPlayer(pkt->getPeerId());
1834         if (player == NULL) {
1835                 errorstream << "Server::ProcessData(): Canceling: "
1836                                 "No player for peer_id=" << pkt->getPeerId()
1837                                 << " disconnecting peer!" << std::endl;
1838                 m_con.DisconnectPeer(pkt->getPeerId());
1839                 return;
1840         }
1841
1842         PlayerSAO *playersao = player->getPlayerSAO();
1843         if (playersao == NULL) {
1844                 errorstream << "Server::ProcessData(): Canceling: "
1845                                 "No player object for peer_id=" << pkt->getPeerId()
1846                                 << " disconnecting peer!" << std::endl;
1847                 m_con.DisconnectPeer(pkt->getPeerId());
1848                 return;
1849         }
1850
1851         m_script->on_playerReceiveFields(playersao, formname, fields);
1852 }