src/clientiface.cpp

   1 /*
   2 Minetest
   3 Copyright (C) 2010-2014 celeron55, Perttu Ahola <celeron55@gmail.com>
   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 <sstream>
  21 #include "clientiface.h"
  22 #include "network/connection.h"
  23 #include "network/serveropcodes.h"
  24 #include "remoteplayer.h"
  25 #include "settings.h"
  26 #include "mapblock.h"
  27 #include "serverenvironment.h"
  28 #include "map.h"
  29 #include "emerge.h"
  30 #include "content_sao.h"              // TODO this is used for cleanup of only
  31 #include "log.h"
  32 #include "util/srp.h"
  33 #include "face_position_cache.h"
  34
  35 const char *ClientInterface::statenames[] = {
  36         "Invalid",
  37         "Disconnecting",
  38         "Denied",
  39         "Created",
  40         "AwaitingInit2",
  41         "HelloSent",
  42         "InitDone",
  43         "DefinitionsSent",
  44         "Active",
  45         "SudoMode",
  46 };
  47
  48
  49
  50 std::string ClientInterface::state2Name(ClientState state)
  51 {
  52         return statenames[state];
  53 }
  54
  55 RemoteClient::RemoteClient() :
  56         m_max_simul_sends(g_settings->getU16("max_simultaneous_block_sends_per_client")),
  57         m_min_time_from_building(
  58                 g_settings->getFloat("full_block_send_enable_min_time_from_building")),
  59         m_max_send_distance(g_settings->getS16("max_block_send_distance")),
  60         m_block_optimize_distance(g_settings->getS16("block_send_optimize_distance")),
  61         m_max_gen_distance(g_settings->getS16("max_block_generate_distance")),
  62         m_occ_cull(g_settings->getBool("server_side_occlusion_culling"))
  63 {
  64 }
  65
  66 void RemoteClient::ResendBlockIfOnWire(v3s16 p)
  67 {
  68         // if this block is on wire, mark it for sending again as soon as possible
  69         if (m_blocks_sending.find(p) != m_blocks_sending.end()) {
  70                 SetBlockNotSent(p);
  71         }
  72 }
  73
  74 LuaEntitySAO *getAttachedObject(PlayerSAO *sao, ServerEnvironment *env)
  75 {
  76         if (!sao->isAttached())
  77                 return nullptr;
  78
  79         int id;
  80         std::string bone;
  81         v3f dummy;
  82         sao->getAttachment(&id, &bone, &dummy, &dummy);
  83         ServerActiveObject *ao = env->getActiveObject(id);
  84         while (id && ao) {
  85                 ao->getAttachment(&id, &bone, &dummy, &dummy);
  86                 if (id)
  87                         ao = env->getActiveObject(id);
  88         }
  89         return dynamic_cast<LuaEntitySAO *>(ao);
  90 }
  91
  92 void RemoteClient::GetNextBlocks (
  93                 ServerEnvironment *env,
  94                 EmergeManager * emerge,
  95                 float dtime,
  96                 std::vector<PrioritySortedBlockTransfer> &dest)
  97 {
  98         // Increment timers
  99         m_nothing_to_send_pause_timer -= dtime;
 100         m_nearest_unsent_reset_timer += dtime;
 101
 102         if (m_nothing_to_send_pause_timer >= 0)
 103                 return;
 104
 105         RemotePlayer *player = env->getPlayer(peer_id);
 106         // This can happen sometimes; clients and players are not in perfect sync.
 107         if (!player)
 108                 return;
 109
 110         PlayerSAO *sao = player->getPlayerSAO();
 111         if (!sao)
 112                 return;
 113
 114         // Won't send anything if already sending
 115         if (m_blocks_sending.size() >= m_max_simul_sends) {
 116                 //infostream<<"Not sending any blocks, Queue full."<<std::endl;
 117                 return;
 118         }
 119
 120         v3f playerpos = sao->getBasePosition();
 121         // if the player is attached, get the velocity from the attached object
 122         LuaEntitySAO *lsao = getAttachedObject(sao, env);
 123         const v3f &playerspeed = lsao? lsao->getVelocity() : player->getSpeed();
 124         v3f playerspeeddir(0,0,0);
 125         if (playerspeed.getLength() > 1.0f * BS)
 126                 playerspeeddir = playerspeed / playerspeed.getLength();
 127         // Predict to next block
 128         v3f playerpos_predicted = playerpos + playerspeeddir * (MAP_BLOCKSIZE * BS);
 129
 130         v3s16 center_nodepos = floatToInt(playerpos_predicted, BS);
 131
 132         v3s16 center = getNodeBlockPos(center_nodepos);
 133
 134         // Camera position and direction
 135         v3f camera_pos = sao->getEyePosition();
 136         v3f camera_dir = v3f(0,0,1);
 137         camera_dir.rotateYZBy(sao->getPitch());
 138         camera_dir.rotateXZBy(sao->getYaw());
 139
 140         /*infostream<<"camera_dir=("<<camera_dir.X<<","<<camera_dir.Y<<","
 141                         <<camera_dir.Z<<")"<<std::endl;*/
 142
 143         /*
 144                 Get the starting value of the block finder radius.
 145         */
 146
 147         if (m_last_center != center) {
 148                 m_nearest_unsent_d = 0;
 149                 m_last_center = center;
 150         }
 151
 152         /*infostream<<"m_nearest_unsent_reset_timer="
 153                         <<m_nearest_unsent_reset_timer<<std::endl;*/
 154
 155         // Reset periodically to workaround for some bugs or stuff
 156         if (m_nearest_unsent_reset_timer > 20.0f) {
 157                 m_nearest_unsent_reset_timer = 0.0f;
 158                 m_nearest_unsent_d = 0;
 159                 //infostream<<"Resetting m_nearest_unsent_d for "
 160                 //              <<server->getPlayerName(peer_id)<<std::endl;
 161         }
 162
 163         //s16 last_nearest_unsent_d = m_nearest_unsent_d;
 164         s16 d_start = m_nearest_unsent_d;
 165
 166         //infostream<<"d_start="<<d_start<<std::endl;
 167
 168         u16 max_simul_sends_usually = m_max_simul_sends;
 169
 170         /*
 171                 Check the time from last addNode/removeNode.
 172
 173                 Decrease send rate if player is building stuff.
 174         */
 175         m_time_from_building += dtime;
 176         if (m_time_from_building < m_min_time_from_building) {
 177                 max_simul_sends_usually
 178                         = LIMITED_MAX_SIMULTANEOUS_BLOCK_SENDS;
 179         }
 180
 181         /*
 182                 Number of blocks sending + number of blocks selected for sending
 183         */
 184         u32 num_blocks_selected = m_blocks_sending.size();
 185
 186         /*
 187                 next time d will be continued from the d from which the nearest
 188                 unsent block was found this time.
 189
 190                 This is because not necessarily any of the blocks found this
 191                 time are actually sent.
 192         */
 193         s32 new_nearest_unsent_d = -1;
 194
 195         // get view range and camera fov from the client
 196         s16 wanted_range = sao->getWantedRange() + 1;
 197         float camera_fov = sao->getFov();
 198
 199         const s16 full_d_max = std::min(adjustDist(m_max_send_distance, camera_fov), wanted_range);
 200         const s16 d_opt = std::min(adjustDist(m_block_optimize_distance, camera_fov), wanted_range);
 201         const s16 d_blocks_in_sight = full_d_max * BS * MAP_BLOCKSIZE;
 202         //infostream << "Fov from client " << camera_fov << " full_d_max " << full_d_max << std::endl;
 203
 204         s16 d_max = full_d_max;
 205         s16 d_max_gen = std::min(adjustDist(m_max_gen_distance, camera_fov), wanted_range);
 206
 207         // Don't loop very much at a time, adjust with distance,
 208         // do more work per RTT with greater distances.
 209         s16 max_d_increment_at_time = full_d_max / 9 + 1;
 210         if (d_max > d_start + max_d_increment_at_time)
 211                 d_max = d_start + max_d_increment_at_time;
 212
 213         // cos(angle between velocity and camera) * |velocity|
 214         // Limit to 0.0f in case player moves backwards.
 215         f32 dot = rangelim(camera_dir.dotProduct(playerspeed), 0.0f, 300.0f);
 216
 217         // Reduce the field of view when a player moves and looks forward.
 218         // limit max fov effect to 50%, 60% at 20n/s fly speed
 219         camera_fov = camera_fov / (1 + dot / 300.0f);
 220
 221         s32 nearest_emerged_d = -1;
 222         s32 nearest_emergefull_d = -1;
 223         s32 nearest_sent_d = -1;
 224         //bool queue_is_full = false;
 225
 226         const v3s16 cam_pos_nodes = floatToInt(camera_pos, BS);
 227
 228         s16 d;
 229         for (d = d_start; d <= d_max; d++) {
 230                 /*
 231                         Get the border/face dot coordinates of a "d-radiused"
 232                         box
 233                 */
 234                 std::vector<v3s16> list = FacePositionCache::getFacePositions(d);
 235
 236                 std::vector<v3s16>::iterator li;
 237                 for (li = list.begin(); li != list.end(); ++li) {
 238                         v3s16 p = *li + center;
 239
 240                         /*
 241                                 Send throttling
 242                                 - Don't allow too many simultaneous transfers
 243                                 - EXCEPT when the blocks are very close
 244
 245                                 Also, don't send blocks that are already flying.
 246                         */
 247
 248                         // Start with the usual maximum
 249                         u16 max_simul_dynamic = max_simul_sends_usually;
 250
 251                         // If block is very close, allow full maximum
 252                         if (d <= BLOCK_SEND_DISABLE_LIMITS_MAX_D)
 253                                 max_simul_dynamic = m_max_simul_sends;
 254
 255                         // Don't select too many blocks for sending
 256                         if (num_blocks_selected >= max_simul_dynamic) {
 257                                 //queue_is_full = true;
 258                                 goto queue_full_break;
 259                         }
 260
 261                         // Don't send blocks that are currently being transferred
 262                         if (m_blocks_sending.find(p) != m_blocks_sending.end())
 263                                 continue;
 264
 265                         /*
 266                                 Do not go over max mapgen limit
 267                         */
 268                         if (blockpos_over_max_limit(p))
 269                                 continue;
 270
 271                         // If this is true, inexistent block will be made from scratch
 272                         bool generate = d <= d_max_gen;
 273
 274                         /*
 275                                 Don't generate or send if not in sight
 276                                 FIXME This only works if the client uses a small enough
 277                                 FOV setting. The default of 72 degrees is fine.
 278                                 Also retrieve a smaller view cone in the direction of the player's
 279                                 movement.
 280                                 (0.1 is about 4 degrees)
 281                         */
 282                         f32 dist;
 283                         if (!(isBlockInSight(p, camera_pos, camera_dir, camera_fov,
 284                                                 d_blocks_in_sight, &dist) ||
 285                                         (playerspeed.getLength() > 1.0f * BS &&
 286                                         isBlockInSight(p, camera_pos, playerspeeddir, 0.1f,
 287                                                 d_blocks_in_sight)))) {
 288                                 continue;
 289                         }
 290
 291                         /*
 292                                 Don't send already sent blocks
 293                         */
 294                         if (m_blocks_sent.find(p) != m_blocks_sent.end())
 295                                 continue;
 296
 297                         /*
 298                                 Check if map has this block
 299                         */
 300                         MapBlock *block = env->getMap().getBlockNoCreateNoEx(p);
 301
 302                         bool surely_not_found_on_disk = false;
 303                         bool block_is_invalid = false;
 304                         if (block) {
 305                                 // Reset usage timer, this block will be of use in the future.
 306                                 block->resetUsageTimer();
 307
 308                                 // Block is dummy if data doesn't exist.
 309                                 // It means it has been not found from disk and not generated
 310                                 if (block->isDummy()) {
 311                                         surely_not_found_on_disk = true;
 312                                 }
 313
 314                                 if (!block->isGenerated())
 315                                         block_is_invalid = true;
 316
 317                                 /*
 318                                         If block is not close, don't send it unless it is near
 319                                         ground level.
 320
 321                                         Block is near ground level if night-time mesh
 322                                         differs from day-time mesh.
 323                                 */
 324                                 if (d >= d_opt) {
 325                                         if (!block->getDayNightDiff())
 326                                                 continue;
 327                                 }
 328
 329                                 if (m_occ_cull && !block_is_invalid &&
 330                                                 env->getMap().isBlockOccluded(block, cam_pos_nodes)) {
 331                                         continue;
 332                                 }
 333                         }
 334
 335                         /*
 336                                 If block has been marked to not exist on disk (dummy)
 337                                 and generating new ones is not wanted, skip block.
 338                         */
 339                         if (!generate && surely_not_found_on_disk) {
 340                                 // get next one.
 341                                 continue;
 342                         }
 343
 344                         /*
 345                                 Add inexistent block to emerge queue.
 346                         */
 347                         if (block == NULL || surely_not_found_on_disk || block_is_invalid) {
 348                                 if (emerge->enqueueBlockEmerge(peer_id, p, generate)) {
 349                                         if (nearest_emerged_d == -1)
 350                                                 nearest_emerged_d = d;
 351                                 } else {
 352                                         if (nearest_emergefull_d == -1)
 353                                                 nearest_emergefull_d = d;
 354                                         goto queue_full_break;
 355                                 }
 356
 357                                 // get next one.
 358                                 continue;
 359                         }
 360
 361                         if (nearest_sent_d == -1)
 362                                 nearest_sent_d = d;
 363
 364                         /*
 365                                 Add block to send queue
 366                         */
 367                         PrioritySortedBlockTransfer q((float)dist, p, peer_id);
 368
 369                         dest.push_back(q);
 370
 371                         num_blocks_selected += 1;
 372                 }
 373         }
 374 queue_full_break:
 375
 376         // If nothing was found for sending and nothing was queued for
 377         // emerging, continue next time browsing from here
 378         if (nearest_emerged_d != -1) {
 379                 new_nearest_unsent_d = nearest_emerged_d;
 380         } else if (nearest_emergefull_d != -1) {
 381                 new_nearest_unsent_d = nearest_emergefull_d;
 382         } else {
 383                 if (d > full_d_max) {
 384                         new_nearest_unsent_d = 0;
 385                         m_nothing_to_send_pause_timer = 2.0f;
 386                 } else {
 387                         if (nearest_sent_d != -1)
 388                                 new_nearest_unsent_d = nearest_sent_d;
 389                         else
 390                                 new_nearest_unsent_d = d;
 391                 }
 392         }
 393
 394         if (new_nearest_unsent_d != -1)
 395                 m_nearest_unsent_d = new_nearest_unsent_d;
 396 }
 397
 398 void RemoteClient::GotBlock(v3s16 p)
 399 {
 400         if (m_blocks_modified.find(p) == m_blocks_modified.end()) {
 401                 if (m_blocks_sending.find(p) != m_blocks_sending.end())
 402                         m_blocks_sending.erase(p);
 403                 else
 404                         m_excess_gotblocks++;
 405
 406                 m_blocks_sent.insert(p);
 407         }
 408 }
 409
 410 void RemoteClient::SentBlock(v3s16 p)
 411 {
 412         if (m_blocks_modified.find(p) != m_blocks_modified.end())
 413                 m_blocks_modified.erase(p);
 414
 415         if (m_blocks_sending.find(p) == m_blocks_sending.end())
 416                 m_blocks_sending[p] = 0.0f;
 417         else
 418                 infostream<<"RemoteClient::SentBlock(): Sent block"
 419                                 " already in m_blocks_sending"<<std::endl;
 420 }
 421
 422 void RemoteClient::SetBlockNotSent(v3s16 p)
 423 {
 424         m_nearest_unsent_d = 0;
 425         m_nothing_to_send_pause_timer = 0;
 426
 427         if (m_blocks_sending.find(p) != m_blocks_sending.end())
 428                 m_blocks_sending.erase(p);
 429         if (m_blocks_sent.find(p) != m_blocks_sent.end())
 430                 m_blocks_sent.erase(p);
 431         m_blocks_modified.insert(p);
 432 }
 433
 434 void RemoteClient::SetBlocksNotSent(std::map<v3s16, MapBlock*> &blocks)
 435 {
 436         m_nearest_unsent_d = 0;
 437         m_nothing_to_send_pause_timer = 0;
 438
 439         for (auto &block : blocks) {
 440                 v3s16 p = block.first;
 441                 m_blocks_modified.insert(p);
 442
 443                 if (m_blocks_sending.find(p) != m_blocks_sending.end())
 444                         m_blocks_sending.erase(p);
 445                 if (m_blocks_sent.find(p) != m_blocks_sent.end())
 446                         m_blocks_sent.erase(p);
 447         }
 448 }
 449
 450 void RemoteClient::notifyEvent(ClientStateEvent event)
 451 {
 452         std::ostringstream myerror;
 453         switch (m_state)
 454         {
 455         case CS_Invalid:
 456                 //intentionally do nothing
 457                 break;
 458         case CS_Created:
 459                 switch (event) {
 460                 case CSE_Hello:
 461                         m_state = CS_HelloSent;
 462                         break;
 463                 case CSE_InitLegacy:
 464                         m_state = CS_AwaitingInit2;
 465                         break;
 466                 case CSE_Disconnect:
 467                         m_state = CS_Disconnecting;
 468                         break;
 469                 case CSE_SetDenied:
 470                         m_state = CS_Denied;
 471                         break;
 472                 /* GotInit2 SetDefinitionsSent SetMediaSent */
 473                 default:
 474                         myerror << "Created: Invalid client state transition! " << event;
 475                         throw ClientStateError(myerror.str());
 476                 }
 477                 break;
 478         case CS_Denied:
 479                 /* don't do anything if in denied state */
 480                 break;
 481         case CS_HelloSent:
 482                 switch(event)
 483                 {
 484                 case CSE_AuthAccept:
 485                         m_state = CS_AwaitingInit2;
 486                         if (chosen_mech == AUTH_MECHANISM_SRP ||
 487                                         chosen_mech == AUTH_MECHANISM_LEGACY_PASSWORD)
 488                                 srp_verifier_delete((SRPVerifier *) auth_data);
 489                         chosen_mech = AUTH_MECHANISM_NONE;
 490                         break;
 491                 case CSE_Disconnect:
 492                         m_state = CS_Disconnecting;
 493                         break;
 494                 case CSE_SetDenied:
 495                         m_state = CS_Denied;
 496                         if (chosen_mech == AUTH_MECHANISM_SRP ||
 497                                         chosen_mech == AUTH_MECHANISM_LEGACY_PASSWORD)
 498                                 srp_verifier_delete((SRPVerifier *) auth_data);
 499                         chosen_mech = AUTH_MECHANISM_NONE;
 500                         break;
 501                 default:
 502                         myerror << "HelloSent: Invalid client state transition! " << event;
 503                         throw ClientStateError(myerror.str());
 504                 }
 505                 break;
 506         case CS_AwaitingInit2:
 507                 switch(event)
 508                 {
 509                 case CSE_GotInit2:
 510                         confirmSerializationVersion();
 511                         m_state = CS_InitDone;
 512                         break;
 513                 case CSE_Disconnect:
 514                         m_state = CS_Disconnecting;
 515                         break;
 516                 case CSE_SetDenied:
 517                         m_state = CS_Denied;
 518                         break;
 519
 520                 /* Init SetDefinitionsSent SetMediaSent */
 521                 default:
 522                         myerror << "InitSent: Invalid client state transition! " << event;
 523                         throw ClientStateError(myerror.str());
 524                 }
 525                 break;
 526
 527         case CS_InitDone:
 528                 switch(event)
 529                 {
 530                 case CSE_SetDefinitionsSent:
 531                         m_state = CS_DefinitionsSent;
 532                         break;
 533                 case CSE_Disconnect:
 534                         m_state = CS_Disconnecting;
 535                         break;
 536                 case CSE_SetDenied:
 537                         m_state = CS_Denied;
 538                         break;
 539
 540                 /* Init GotInit2 SetMediaSent */
 541                 default:
 542                         myerror << "InitDone: Invalid client state transition! " << event;
 543                         throw ClientStateError(myerror.str());
 544                 }
 545                 break;
 546         case CS_DefinitionsSent:
 547                 switch(event)
 548                 {
 549                 case CSE_SetClientReady:
 550                         m_state = CS_Active;
 551                         break;
 552                 case CSE_Disconnect:
 553                         m_state = CS_Disconnecting;
 554                         break;
 555                 case CSE_SetDenied:
 556                         m_state = CS_Denied;
 557                         break;
 558                 /* Init GotInit2 SetDefinitionsSent */
 559                 default:
 560                         myerror << "DefinitionsSent: Invalid client state transition! " << event;
 561                         throw ClientStateError(myerror.str());
 562                 }
 563                 break;
 564         case CS_Active:
 565                 switch(event)
 566                 {
 567                 case CSE_SetDenied:
 568                         m_state = CS_Denied;
 569                         break;
 570                 case CSE_Disconnect:
 571                         m_state = CS_Disconnecting;
 572                         break;
 573                 case CSE_SudoSuccess:
 574                         m_state = CS_SudoMode;
 575                         if (chosen_mech == AUTH_MECHANISM_SRP)
 576                                 srp_verifier_delete((SRPVerifier *) auth_data);
 577                         chosen_mech = AUTH_MECHANISM_NONE;
 578                         break;
 579                 /* Init GotInit2 SetDefinitionsSent SetMediaSent SetDenied */
 580                 default:
 581                         myerror << "Active: Invalid client state transition! " << event;
 582                         throw ClientStateError(myerror.str());
 583                         break;
 584                 }
 585                 break;
 586         case CS_SudoMode:
 587                 switch(event)
 588                 {
 589                 case CSE_SetDenied:
 590                         m_state = CS_Denied;
 591                         break;
 592                 case CSE_Disconnect:
 593                         m_state = CS_Disconnecting;
 594                         break;
 595                 case CSE_SudoLeave:
 596                         m_state = CS_Active;
 597                         break;
 598                 default:
 599                         myerror << "Active: Invalid client state transition! " << event;
 600                         throw ClientStateError(myerror.str());
 601                         break;
 602                 }
 603                 break;
 604         case CS_Disconnecting:
 605                 /* we are already disconnecting */
 606                 break;
 607         }
 608 }
 609
 610 u64 RemoteClient::uptime() const
 611 {
 612         return porting::getTimeS() - m_connection_time;
 613 }
 614
 615 ClientInterface::ClientInterface(const std::shared_ptr<con::Connection> & con)
 616 :
 617         m_con(con),
 618         m_env(NULL),
 619         m_print_info_timer(0.0f)
 620 {
 621
 622 }
 623 ClientInterface::~ClientInterface()
 624 {
 625         /*
 626                 Delete clients
 627         */
 628         {
 629                 MutexAutoLock clientslock(m_clients_mutex);
 630
 631                 for (auto &client_it : m_clients) {
 632                         // Delete client
 633                         delete client_it.second;
 634                 }
 635         }
 636 }
 637
 638 std::vector<session_t> ClientInterface::getClientIDs(ClientState min_state)
 639 {
 640         std::vector<session_t> reply;
 641         MutexAutoLock clientslock(m_clients_mutex);
 642
 643         for (const auto &m_client : m_clients) {
 644                 if (m_client.second->getState() >= min_state)
 645                         reply.push_back(m_client.second->peer_id);
 646         }
 647
 648         return reply;
 649 }
 650
 651 /**
 652  * Verify if user limit was reached.
 653  * User limit count all clients from HelloSent state (MT protocol user) to Active state
 654  * @return true if user limit was reached
 655  */
 656 bool ClientInterface::isUserLimitReached()
 657 {
 658         return getClientIDs(CS_HelloSent).size() >= g_settings->getU16("max_users");
 659 }
 660
 661 void ClientInterface::step(float dtime)
 662 {
 663         m_print_info_timer += dtime;
 664         if (m_print_info_timer >= 30.0f) {
 665                 m_print_info_timer = 0.0f;
 666                 UpdatePlayerList();
 667         }
 668 }
 669
 670 void ClientInterface::UpdatePlayerList()
 671 {
 672         if (m_env) {
 673                 std::vector<session_t> clients = getClientIDs();
 674                 m_clients_names.clear();
 675
 676
 677                 if (!clients.empty())
 678                         infostream<<"Players:"<<std::endl;
 679
 680                 for (session_t i : clients) {
 681                         RemotePlayer *player = m_env->getPlayer(i);
 682
 683                         if (player == NULL)
 684                                 continue;
 685
 686                         infostream << "* " << player->getName() << "\t";
 687
 688                         {
 689                                 MutexAutoLock clientslock(m_clients_mutex);
 690                                 RemoteClient* client = lockedGetClientNoEx(i);
 691                                 if (client)
 692                                         client->PrintInfo(infostream);
 693                         }
 694
 695                         m_clients_names.emplace_back(player->getName());
 696                 }
 697         }
 698 }
 699
 700 void ClientInterface::send(session_t peer_id, u8 channelnum,
 701                 NetworkPacket *pkt, bool reliable)
 702 {
 703         m_con->Send(peer_id, channelnum, pkt, reliable);
 704 }
 705
 706 void ClientInterface::sendToAll(NetworkPacket *pkt)
 707 {
 708         MutexAutoLock clientslock(m_clients_mutex);
 709         for (auto &client_it : m_clients) {
 710                 RemoteClient *client = client_it.second;
 711
 712                 if (client->net_proto_version != 0) {
 713                         m_con->Send(client->peer_id,
 714                                         clientCommandFactoryTable[pkt->getCommand()].channel, pkt,
 715                                         clientCommandFactoryTable[pkt->getCommand()].reliable);
 716                 }
 717         }
 718 }
 719
 720 void ClientInterface::sendToAllCompat(NetworkPacket *pkt, NetworkPacket *legacypkt,
 721                 u16 min_proto_ver)
 722 {
 723         MutexAutoLock clientslock(m_clients_mutex);
 724         for (auto &client_it : m_clients) {
 725                 RemoteClient *client = client_it.second;
 726                 NetworkPacket *pkt_to_send = nullptr;
 727
 728                 if (client->net_proto_version >= min_proto_ver) {
 729                         pkt_to_send = pkt;
 730                 } else if (client->net_proto_version != 0) {
 731                         pkt_to_send = legacypkt;
 732                 } else {
 733                         warningstream << "Client with unhandled version to handle: '"
 734                                 << client->net_proto_version << "'";
 735                         continue;
 736                 }
 737
 738                 m_con->Send(client->peer_id,
 739                         clientCommandFactoryTable[pkt_to_send->getCommand()].channel,
 740                         pkt_to_send,
 741                         clientCommandFactoryTable[pkt_to_send->getCommand()].reliable);
 742         }
 743 }
 744
 745 RemoteClient* ClientInterface::getClientNoEx(session_t peer_id, ClientState state_min)
 746 {
 747         MutexAutoLock clientslock(m_clients_mutex);
 748         RemoteClientMap::const_iterator n = m_clients.find(peer_id);
 749         // The client may not exist; clients are immediately removed if their
 750         // access is denied, and this event occurs later then.
 751         if (n == m_clients.end())
 752                 return NULL;
 753
 754         if (n->second->getState() >= state_min)
 755                 return n->second;
 756
 757         return NULL;
 758 }
 759
 760 RemoteClient* ClientInterface::lockedGetClientNoEx(session_t peer_id, ClientState state_min)
 761 {
 762         RemoteClientMap::const_iterator n = m_clients.find(peer_id);
 763         // The client may not exist; clients are immediately removed if their
 764         // access is denied, and this event occurs later then.
 765         if (n == m_clients.end())
 766                 return NULL;
 767
 768         if (n->second->getState() >= state_min)
 769                 return n->second;
 770
 771         return NULL;
 772 }
 773
 774 ClientState ClientInterface::getClientState(session_t peer_id)
 775 {
 776         MutexAutoLock clientslock(m_clients_mutex);
 777         RemoteClientMap::const_iterator n = m_clients.find(peer_id);
 778         // The client may not exist; clients are immediately removed if their
 779         // access is denied, and this event occurs later then.
 780         if (n == m_clients.end())
 781                 return CS_Invalid;
 782
 783         return n->second->getState();
 784 }
 785
 786 void ClientInterface::setPlayerName(session_t peer_id, const std::string &name)
 787 {
 788         MutexAutoLock clientslock(m_clients_mutex);
 789         RemoteClientMap::iterator n = m_clients.find(peer_id);
 790         // The client may not exist; clients are immediately removed if their
 791         // access is denied, and this event occurs later then.
 792         if (n != m_clients.end())
 793                 n->second->setName(name);
 794 }
 795
 796 void ClientInterface::DeleteClient(session_t peer_id)
 797 {
 798         MutexAutoLock conlock(m_clients_mutex);
 799
 800         // Error check
 801         RemoteClientMap::iterator n = m_clients.find(peer_id);
 802         // The client may not exist; clients are immediately removed if their
 803         // access is denied, and this event occurs later then.
 804         if (n == m_clients.end())
 805                 return;
 806
 807         /*
 808                 Mark objects to be not known by the client
 809         */
 810         //TODO this should be done by client destructor!!!
 811         RemoteClient *client = n->second;
 812         // Handle objects
 813         for (u16 id : client->m_known_objects) {
 814                 // Get object
 815                 ServerActiveObject* obj = m_env->getActiveObject(id);
 816
 817                 if(obj && obj->m_known_by_count > 0)
 818                         obj->m_known_by_count--;
 819         }
 820
 821         // Delete client
 822         delete m_clients[peer_id];
 823         m_clients.erase(peer_id);
 824 }
 825
 826 void ClientInterface::CreateClient(session_t peer_id)
 827 {
 828         MutexAutoLock conlock(m_clients_mutex);
 829
 830         // Error check
 831         RemoteClientMap::iterator n = m_clients.find(peer_id);
 832         // The client shouldn't already exist
 833         if (n != m_clients.end()) return;
 834
 835         // Create client
 836         RemoteClient *client = new RemoteClient();
 837         client->peer_id = peer_id;
 838         m_clients[client->peer_id] = client;
 839 }
 840
 841 void ClientInterface::event(session_t peer_id, ClientStateEvent event)
 842 {
 843         {
 844                 MutexAutoLock clientlock(m_clients_mutex);
 845
 846                 // Error check
 847                 RemoteClientMap::iterator n = m_clients.find(peer_id);
 848
 849                 // No client to deliver event
 850                 if (n == m_clients.end())
 851                         return;
 852                 n->second->notifyEvent(event);
 853         }
 854
 855         if ((event == CSE_SetClientReady) ||
 856                 (event == CSE_Disconnect)     ||
 857                 (event == CSE_SetDenied))
 858         {
 859                 UpdatePlayerList();
 860         }
 861 }
 862
 863 u16 ClientInterface::getProtocolVersion(session_t peer_id)
 864 {
 865         MutexAutoLock conlock(m_clients_mutex);
 866
 867         // Error check
 868         RemoteClientMap::iterator n = m_clients.find(peer_id);
 869
 870         // No client to get version
 871         if (n == m_clients.end())
 872                 return 0;
 873
 874         return n->second->net_proto_version;
 875 }
 876
 877 void ClientInterface::setClientVersion(session_t peer_id, u8 major, u8 minor, u8 patch,
 878                 const std::string &full)
 879 {
 880         MutexAutoLock conlock(m_clients_mutex);
 881
 882         // Error check
 883         RemoteClientMap::iterator n = m_clients.find(peer_id);
 884
 885         // No client to set versions
 886         if (n == m_clients.end())
 887                 return;
 888
 889         n->second->setVersionInfo(major, minor, patch, full);
 890 }