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 "server/luaentity_sao.h"
  31 #include "server/player_sao.h"
  32 #include "log.h"
  33 #include "util/srp.h"
  34 #include "face_position_cache.h"
  35
  36 const char *ClientInterface::statenames[] = {
  37         "Invalid",
  38         "Disconnecting",
  39         "Denied",
  40         "Created",
  41         "AwaitingInit2",
  42         "HelloSent",
  43         "InitDone",
  44         "DefinitionsSent",
  45         "Active",
  46         "SudoMode",
  47 };
  48
  49
  50
  51 std::string ClientInterface::state2Name(ClientState state)
  52 {
  53         return statenames[state];
  54 }
  55
  56 RemoteClient::RemoteClient() :
  57         m_max_simul_sends(g_settings->getU16("max_simultaneous_block_sends_per_client")),
  58         m_min_time_from_building(
  59                 g_settings->getFloat("full_block_send_enable_min_time_from_building")),
  60         m_max_send_distance(g_settings->getS16("max_block_send_distance")),
  61         m_block_optimize_distance(g_settings->getS16("block_send_optimize_distance")),
  62         m_max_gen_distance(g_settings->getS16("max_block_generate_distance")),
  63         m_occ_cull(g_settings->getBool("server_side_occlusion_culling"))
  64 {
  65 }
  66
  67 void RemoteClient::ResendBlockIfOnWire(v3s16 p)
  68 {
  69         // if this block is on wire, mark it for sending again as soon as possible
  70         if (m_blocks_sending.find(p) != m_blocks_sending.end()) {
  71                 SetBlockNotSent(p);
  72         }
  73 }
  74
  75 LuaEntitySAO *getAttachedObject(PlayerSAO *sao, ServerEnvironment *env)
  76 {
  77         if (!sao->isAttached())
  78                 return nullptr;
  79
  80         int id;
  81         std::string bone;
  82         v3f dummy;
  83         bool force_visible;
  84         sao->getAttachment(&id, &bone, &dummy, &dummy, &force_visible);
  85         ServerActiveObject *ao = env->getActiveObject(id);
  86         while (id && ao) {
  87                 ao->getAttachment(&id, &bone, &dummy, &dummy, &force_visible);
  88                 if (id)
  89                         ao = env->getActiveObject(id);
  90         }
  91         return dynamic_cast<LuaEntitySAO *>(ao);
  92 }
  93
  94 void RemoteClient::GetNextBlocks (
  95                 ServerEnvironment *env,
  96                 EmergeManager * emerge,
  97                 float dtime,
  98                 std::vector<PrioritySortedBlockTransfer> &dest)
  99 {
 100         // Increment timers
 101         m_nothing_to_send_pause_timer -= dtime;
 102         m_map_send_completion_timer += dtime;
 103
 104         if (m_nothing_to_send_pause_timer >= 0)
 105                 return;
 106
 107         RemotePlayer *player = env->getPlayer(peer_id);
 108         // This can happen sometimes; clients and players are not in perfect sync.
 109         if (!player)
 110                 return;
 111
 112         PlayerSAO *sao = player->getPlayerSAO();
 113         if (!sao)
 114                 return;
 115
 116         // Won't send anything if already sending
 117         if (m_blocks_sending.size() >= m_max_simul_sends) {
 118                 //infostream<<"Not sending any blocks, Queue full."<<std::endl;
 119                 return;
 120         }
 121
 122         v3f playerpos = sao->getBasePosition();
 123         // if the player is attached, get the velocity from the attached object
 124         LuaEntitySAO *lsao = getAttachedObject(sao, env);
 125         const v3f &playerspeed = lsao? lsao->getVelocity() : player->getSpeed();
 126         v3f playerspeeddir(0,0,0);
 127         if (playerspeed.getLength() > 1.0f * BS)
 128                 playerspeeddir = playerspeed / playerspeed.getLength();
 129         // Predict to next block
 130         v3f playerpos_predicted = playerpos + playerspeeddir * (MAP_BLOCKSIZE * BS);
 131
 132         v3s16 center_nodepos = floatToInt(playerpos_predicted, BS);
 133
 134         v3s16 center = getNodeBlockPos(center_nodepos);
 135
 136         // Camera position and direction
 137         v3f camera_pos = sao->getEyePosition();
 138         v3f camera_dir = v3f(0,0,1);
 139         camera_dir.rotateYZBy(sao->getLookPitch());
 140         camera_dir.rotateXZBy(sao->getRotation().Y);
 141
 142         u16 max_simul_sends_usually = m_max_simul_sends;
 143
 144         /*
 145                 Check the time from last addNode/removeNode.
 146
 147                 Decrease send rate if player is building stuff.
 148         */
 149         m_time_from_building += dtime;
 150         if (m_time_from_building < m_min_time_from_building) {
 151                 max_simul_sends_usually
 152                         = LIMITED_MAX_SIMULTANEOUS_BLOCK_SENDS;
 153         }
 154
 155         /*
 156                 Number of blocks sending + number of blocks selected for sending
 157         */
 158         u32 num_blocks_selected = m_blocks_sending.size();
 159
 160         /*
 161                 next time d will be continued from the d from which the nearest
 162                 unsent block was found this time.
 163
 164                 This is because not necessarily any of the blocks found this
 165                 time are actually sent.
 166         */
 167         s32 new_nearest_unsent_d = -1;
 168
 169         // Get view range and camera fov (radians) from the client
 170         s16 wanted_range = sao->getWantedRange() + 1;
 171         float camera_fov = sao->getFov();
 172
 173         /*
 174                 Get the starting value of the block finder radius.
 175         */
 176         if (m_last_center != center) {
 177                 m_nearest_unsent_d = 0;
 178                 m_last_center = center;
 179         }
 180         // reset the unsent distance if the view angle has changed more that 10% of the fov
 181         // (this matches isBlockInSight which allows for an extra 10%)
 182         if (camera_dir.dotProduct(m_last_camera_dir) < std::cos(camera_fov * 0.1f)) {
 183                 m_nearest_unsent_d = 0;
 184                 m_last_camera_dir = camera_dir;
 185         }
 186         if (m_nearest_unsent_d > 0) {
 187                 // make sure any blocks modified since the last time we sent blocks are resent
 188                 for (const v3s16 &p : m_blocks_modified) {
 189                         m_nearest_unsent_d = std::min(m_nearest_unsent_d, center.getDistanceFrom(p));
 190                 }
 191         }
 192         m_blocks_modified.clear();
 193
 194         s16 d_start = m_nearest_unsent_d;
 195
 196         // Distrust client-sent FOV and get server-set player object property
 197         // zoom FOV (degrees) as a check to avoid hacked clients using FOV to load
 198         // distant world.
 199         // (zoom is disabled by value 0)
 200         float prop_zoom_fov = sao->getZoomFOV() < 0.001f ?
 201                 0.0f :
 202                 std::max(camera_fov, sao->getZoomFOV() * core::DEGTORAD);
 203
 204         const s16 full_d_max = std::min(adjustDist(m_max_send_distance, prop_zoom_fov),
 205                 wanted_range);
 206         const s16 d_opt = std::min(adjustDist(m_block_optimize_distance, prop_zoom_fov),
 207                 wanted_range);
 208         const s16 d_blocks_in_sight = full_d_max * BS * MAP_BLOCKSIZE;
 209
 210         s16 d_max_gen = std::min(adjustDist(m_max_gen_distance, prop_zoom_fov),
 211                 wanted_range);
 212
 213         s16 d_max = full_d_max;
 214
 215         // Don't loop very much at a time
 216         s16 max_d_increment_at_time = 2;
 217         if (d_max > d_start + max_d_increment_at_time)
 218                 d_max = d_start + max_d_increment_at_time;
 219
 220         // cos(angle between velocity and camera) * |velocity|
 221         // Limit to 0.0f in case player moves backwards.
 222         f32 dot = rangelim(camera_dir.dotProduct(playerspeed), 0.0f, 300.0f);
 223
 224         // Reduce the field of view when a player moves and looks forward.
 225         // limit max fov effect to 50%, 60% at 20n/s fly speed
 226         camera_fov = camera_fov / (1 + dot / 300.0f);
 227
 228         s32 nearest_emerged_d = -1;
 229         s32 nearest_emergefull_d = -1;
 230         s32 nearest_sent_d = -1;
 231         //bool queue_is_full = false;
 232
 233         const v3s16 cam_pos_nodes = floatToInt(camera_pos, BS);
 234
 235         s16 d;
 236         for (d = d_start; d <= d_max; d++) {
 237                 /*
 238                         Get the border/face dot coordinates of a "d-radiused"
 239                         box
 240                 */
 241                 std::vector<v3s16> list = FacePositionCache::getFacePositions(d);
 242
 243                 std::vector<v3s16>::iterator li;
 244                 for (li = list.begin(); li != list.end(); ++li) {
 245                         v3s16 p = *li + center;
 246
 247                         /*
 248                                 Send throttling
 249                                 - Don't allow too many simultaneous transfers
 250                                 - EXCEPT when the blocks are very close
 251
 252                                 Also, don't send blocks that are already flying.
 253                         */
 254
 255                         // Start with the usual maximum
 256                         u16 max_simul_dynamic = max_simul_sends_usually;
 257
 258                         // If block is very close, allow full maximum
 259                         if (d <= BLOCK_SEND_DISABLE_LIMITS_MAX_D)
 260                                 max_simul_dynamic = m_max_simul_sends;
 261
 262                         // Don't select too many blocks for sending
 263                         if (num_blocks_selected >= max_simul_dynamic) {
 264                                 //queue_is_full = true;
 265                                 goto queue_full_break;
 266                         }
 267
 268                         // Don't send blocks that are currently being transferred
 269                         if (m_blocks_sending.find(p) != m_blocks_sending.end())
 270                                 continue;
 271
 272                         /*
 273                                 Do not go over max mapgen limit
 274                         */
 275                         if (blockpos_over_max_limit(p))
 276                                 continue;
 277
 278                         // If this is true, inexistent block will be made from scratch
 279                         bool generate = d <= d_max_gen;
 280
 281                         /*
 282                                 Don't generate or send if not in sight
 283                                 FIXME This only works if the client uses a small enough
 284                                 FOV setting. The default of 72 degrees is fine.
 285                                 Also retrieve a smaller view cone in the direction of the player's
 286                                 movement.
 287                                 (0.1 is about 4 degrees)
 288                         */
 289                         f32 dist;
 290                         if (!(isBlockInSight(p, camera_pos, camera_dir, camera_fov,
 291                                                 d_blocks_in_sight, &dist) ||
 292                                         (playerspeed.getLength() > 1.0f * BS &&
 293                                         isBlockInSight(p, camera_pos, playerspeeddir, 0.1f,
 294                                                 d_blocks_in_sight)))) {
 295                                 continue;
 296                         }
 297
 298                         /*
 299                                 Check if map has this block
 300                         */
 301                         MapBlock *block = env->getMap().getBlockNoCreateNoEx(p);
 302                         if (block) {
 303                                 // First: Reset usage timer, this block will be of use in the future.
 304                                 block->resetUsageTimer();
 305                         }
 306
 307                         /*
 308                                 Don't send already sent blocks
 309                         */
 310                         if (m_blocks_sent.find(p) != m_blocks_sent.end())
 311                                 continue;
 312
 313                         bool block_not_found = false;
 314                         if (block) {
 315                                 // Check whether the block exists (with data)
 316                                 if (!block->isGenerated())
 317                                         block_not_found = true;
 318
 319                                 /*
 320                                         If block is not close, don't send it unless it is near
 321                                         ground level.
 322
 323                                         Block is near ground level if night-time mesh
 324                                         differs from day-time mesh.
 325                                 */
 326                                 if (d >= d_opt) {
 327                                         if (!block->getIsUnderground() && !block->getDayNightDiff())
 328                                                 continue;
 329                                 }
 330
 331                                 /*
 332                                         Check occlusion cache first.
 333                                  */
 334                                 if (m_blocks_occ.find(p) != m_blocks_occ.end())
 335                                         continue;
 336
 337                                 if (m_occ_cull && !block_not_found &&
 338                                                 env->getMap().isBlockOccluded(block, cam_pos_nodes)) {
 339                                         m_blocks_occ.insert(p);
 340                                         continue;
 341                                 }
 342                         }
 343
 344                         /*
 345                                 If block has been marked to not exist on disk (dummy) or is
 346                                 not generated and generating new ones is not wanted, skip block.
 347                         */
 348                         if (!generate && block_not_found) {
 349                                 // get next one.
 350                                 continue;
 351                         }
 352
 353                         /*
 354                                 Add inexistent block to emerge queue.
 355                         */
 356                         if (block == NULL || block_not_found) {
 357                                 if (emerge->enqueueBlockEmerge(peer_id, p, generate)) {
 358                                         if (nearest_emerged_d == -1)
 359                                                 nearest_emerged_d = d;
 360                                 } else {
 361                                         if (nearest_emergefull_d == -1)
 362                                                 nearest_emergefull_d = d;
 363                                         goto queue_full_break;
 364                                 }
 365
 366                                 // get next one.
 367                                 continue;
 368                         }
 369
 370                         if (nearest_sent_d == -1)
 371                                 nearest_sent_d = d;
 372
 373                         /*
 374                                 Add block to send queue
 375                         */
 376                         PrioritySortedBlockTransfer q((float)dist, p, peer_id);
 377
 378                         dest.push_back(q);
 379
 380                         num_blocks_selected += 1;
 381                 }
 382         }
 383 queue_full_break:
 384
 385         // If nothing was found for sending and nothing was queued for
 386         // emerging, continue next time browsing from here
 387         if (nearest_emerged_d != -1) {
 388                 new_nearest_unsent_d = nearest_emerged_d;
 389         } else if (nearest_emergefull_d != -1) {
 390                 new_nearest_unsent_d = nearest_emergefull_d;
 391         } else {
 392                 if (d > full_d_max) {
 393                         new_nearest_unsent_d = 0;
 394                         m_nothing_to_send_pause_timer = 2.0f;
 395                         infostream << "Server: Player " << m_name << ", RemoteClient " << peer_id << ": full map send completed after " << m_map_send_completion_timer << "s, restarting" << std::endl;
 396                         m_map_send_completion_timer = 0.0f;
 397                 } else {
 398                         if (nearest_sent_d != -1)
 399                                 new_nearest_unsent_d = nearest_sent_d;
 400                         else
 401                                 new_nearest_unsent_d = d;
 402                 }
 403         }
 404
 405         if (new_nearest_unsent_d != -1 && m_nearest_unsent_d != new_nearest_unsent_d) {
 406                 m_nearest_unsent_d = new_nearest_unsent_d;
 407                 // if the distance has changed, clear the occlusion cache
 408                 m_blocks_occ.clear();
 409         }
 410 }
 411
 412 void RemoteClient::GotBlock(v3s16 p)
 413 {
 414         if (m_blocks_sending.find(p) != m_blocks_sending.end()) {
 415                 m_blocks_sending.erase(p);
 416                 // only add to sent blocks if it actually was sending
 417                 // (it might have been modified since)
 418                 m_blocks_sent.insert(p);
 419         } else {
 420                 m_excess_gotblocks++;
 421         }
 422 }
 423
 424 void RemoteClient::SentBlock(v3s16 p)
 425 {
 426         if (m_blocks_sending.find(p) == m_blocks_sending.end())
 427                 m_blocks_sending[p] = 0.0f;
 428         else
 429                 infostream<<"RemoteClient::SentBlock(): Sent block"
 430                                 " already in m_blocks_sending"<<std::endl;
 431 }
 432
 433 void RemoteClient::SetBlockNotSent(v3s16 p)
 434 {
 435         m_nothing_to_send_pause_timer = 0;
 436
 437         // remove the block from sending and sent sets,
 438         // and mark as modified if found
 439         if (m_blocks_sending.erase(p) + m_blocks_sent.erase(p) > 0)
 440                 m_blocks_modified.insert(p);
 441 }
 442
 443 void RemoteClient::SetBlocksNotSent(std::map<v3s16, MapBlock*> &blocks)
 444 {
 445         m_nothing_to_send_pause_timer = 0;
 446
 447         for (auto &block : blocks) {
 448                 v3s16 p = block.first;
 449                 // remove the block from sending and sent sets,
 450                 // and mark as modified if found
 451                 if (m_blocks_sending.erase(p) + m_blocks_sent.erase(p) > 0)
 452                         m_blocks_modified.insert(p);
 453         }
 454 }
 455
 456 void RemoteClient::notifyEvent(ClientStateEvent event)
 457 {
 458         std::ostringstream myerror;
 459         switch (m_state)
 460         {
 461         case CS_Invalid:
 462                 //intentionally do nothing
 463                 break;
 464         case CS_Created:
 465                 switch (event) {
 466                 case CSE_Hello:
 467                         m_state = CS_HelloSent;
 468                         break;
 469                 case CSE_Disconnect:
 470                         m_state = CS_Disconnecting;
 471                         break;
 472                 case CSE_SetDenied:
 473                         m_state = CS_Denied;
 474                         break;
 475                 /* GotInit2 SetDefinitionsSent SetMediaSent */
 476                 default:
 477                         myerror << "Created: Invalid client state transition! " << event;
 478                         throw ClientStateError(myerror.str());
 479                 }
 480                 break;
 481         case CS_Denied:
 482                 /* don't do anything if in denied state */
 483                 break;
 484         case CS_HelloSent:
 485                 switch(event)
 486                 {
 487                 case CSE_AuthAccept:
 488                         m_state = CS_AwaitingInit2;
 489                         resetChosenMech();
 490                         break;
 491                 case CSE_Disconnect:
 492                         m_state = CS_Disconnecting;
 493                         break;
 494                 case CSE_SetDenied:
 495                         m_state = CS_Denied;
 496                         resetChosenMech();
 497                         break;
 498                 default:
 499                         myerror << "HelloSent: Invalid client state transition! " << event;
 500                         throw ClientStateError(myerror.str());
 501                 }
 502                 break;
 503         case CS_AwaitingInit2:
 504                 switch(event)
 505                 {
 506                 case CSE_GotInit2:
 507                         confirmSerializationVersion();
 508                         m_state = CS_InitDone;
 509                         break;
 510                 case CSE_Disconnect:
 511                         m_state = CS_Disconnecting;
 512                         break;
 513                 case CSE_SetDenied:
 514                         m_state = CS_Denied;
 515                         break;
 516
 517                 /* Init SetDefinitionsSent SetMediaSent */
 518                 default:
 519                         myerror << "InitSent: Invalid client state transition! " << event;
 520                         throw ClientStateError(myerror.str());
 521                 }
 522                 break;
 523
 524         case CS_InitDone:
 525                 switch(event)
 526                 {
 527                 case CSE_SetDefinitionsSent:
 528                         m_state = CS_DefinitionsSent;
 529                         break;
 530                 case CSE_Disconnect:
 531                         m_state = CS_Disconnecting;
 532                         break;
 533                 case CSE_SetDenied:
 534                         m_state = CS_Denied;
 535                         break;
 536
 537                 /* Init GotInit2 SetMediaSent */
 538                 default:
 539                         myerror << "InitDone: Invalid client state transition! " << event;
 540                         throw ClientStateError(myerror.str());
 541                 }
 542                 break;
 543         case CS_DefinitionsSent:
 544                 switch(event)
 545                 {
 546                 case CSE_SetClientReady:
 547                         m_state = CS_Active;
 548                         break;
 549                 case CSE_Disconnect:
 550                         m_state = CS_Disconnecting;
 551                         break;
 552                 case CSE_SetDenied:
 553                         m_state = CS_Denied;
 554                         break;
 555                 /* Init GotInit2 SetDefinitionsSent */
 556                 default:
 557                         myerror << "DefinitionsSent: Invalid client state transition! " << event;
 558                         throw ClientStateError(myerror.str());
 559                 }
 560                 break;
 561         case CS_Active:
 562                 switch(event)
 563                 {
 564                 case CSE_SetDenied:
 565                         m_state = CS_Denied;
 566                         break;
 567                 case CSE_Disconnect:
 568                         m_state = CS_Disconnecting;
 569                         break;
 570                 case CSE_SudoSuccess:
 571                         m_state = CS_SudoMode;
 572                         resetChosenMech();
 573                         break;
 574                 /* Init GotInit2 SetDefinitionsSent SetMediaSent SetDenied */
 575                 default:
 576                         myerror << "Active: Invalid client state transition! " << event;
 577                         throw ClientStateError(myerror.str());
 578                         break;
 579                 }
 580                 break;
 581         case CS_SudoMode:
 582                 switch(event)
 583                 {
 584                 case CSE_SetDenied:
 585                         m_state = CS_Denied;
 586                         break;
 587                 case CSE_Disconnect:
 588                         m_state = CS_Disconnecting;
 589                         break;
 590                 case CSE_SudoLeave:
 591                         m_state = CS_Active;
 592                         break;
 593                 default:
 594                         myerror << "Active: Invalid client state transition! " << event;
 595                         throw ClientStateError(myerror.str());
 596                         break;
 597                 }
 598                 break;
 599         case CS_Disconnecting:
 600                 /* we are already disconnecting */
 601                 break;
 602         }
 603 }
 604
 605 void RemoteClient::resetChosenMech()
 606 {
 607         if (auth_data) {
 608                 srp_verifier_delete((SRPVerifier *) auth_data);
 609                 auth_data = nullptr;
 610         }
 611         chosen_mech = AUTH_MECHANISM_NONE;
 612 }
 613
 614 u64 RemoteClient::uptime() const
 615 {
 616         return porting::getTimeS() - m_connection_time;
 617 }
 618
 619 ClientInterface::ClientInterface(const std::shared_ptr<con::Connection> & con)
 620 :
 621         m_con(con),
 622         m_env(NULL),
 623         m_print_info_timer(0.0f)
 624 {
 625
 626 }
 627 ClientInterface::~ClientInterface()
 628 {
 629         /*
 630                 Delete clients
 631         */
 632         {
 633                 RecursiveMutexAutoLock clientslock(m_clients_mutex);
 634
 635                 for (auto &client_it : m_clients) {
 636                         // Delete client
 637                         delete client_it.second;
 638                 }
 639         }
 640 }
 641
 642 std::vector<session_t> ClientInterface::getClientIDs(ClientState min_state)
 643 {
 644         std::vector<session_t> reply;
 645         RecursiveMutexAutoLock clientslock(m_clients_mutex);
 646
 647         for (const auto &m_client : m_clients) {
 648                 if (m_client.second->getState() >= min_state)
 649                         reply.push_back(m_client.second->peer_id);
 650         }
 651
 652         return reply;
 653 }
 654
 655 void ClientInterface::markBlockposAsNotSent(const v3s16 &pos)
 656 {
 657         RecursiveMutexAutoLock clientslock(m_clients_mutex);
 658         for (const auto &client : m_clients) {
 659                 if (client.second->getState() >= CS_Active)
 660                         client.second->SetBlockNotSent(pos);
 661         }
 662 }
 663
 664 /**
 665  * Verify if user limit was reached.
 666  * User limit count all clients from HelloSent state (MT protocol user) to Active state
 667  * @return true if user limit was reached
 668  */
 669 bool ClientInterface::isUserLimitReached()
 670 {
 671         return getClientIDs(CS_HelloSent).size() >= g_settings->getU16("max_users");
 672 }
 673
 674 void ClientInterface::step(float dtime)
 675 {
 676         m_print_info_timer += dtime;
 677         if (m_print_info_timer >= 30.0f) {
 678                 m_print_info_timer = 0.0f;
 679                 UpdatePlayerList();
 680         }
 681 }
 682
 683 void ClientInterface::UpdatePlayerList()
 684 {
 685         if (m_env) {
 686                 std::vector<session_t> clients = getClientIDs();
 687                 m_clients_names.clear();
 688
 689                 if (!clients.empty())
 690                         infostream<<"Players:"<<std::endl;
 691
 692                 for (session_t i : clients) {
 693                         RemotePlayer *player = m_env->getPlayer(i);
 694
 695                         if (player == NULL)
 696                                 continue;
 697
 698                         infostream << "* " << player->getName() << "\t";
 699
 700                         {
 701                                 RecursiveMutexAutoLock clientslock(m_clients_mutex);
 702                                 RemoteClient* client = lockedGetClientNoEx(i);
 703                                 if (client)
 704                                         client->PrintInfo(infostream);
 705                         }
 706
 707                         m_clients_names.emplace_back(player->getName());
 708                 }
 709         }
 710 }
 711
 712 void ClientInterface::send(session_t peer_id, u8 channelnum,
 713                 NetworkPacket *pkt, bool reliable)
 714 {
 715         m_con->Send(peer_id, channelnum, pkt, reliable);
 716 }
 717
 718 void ClientInterface::sendToAll(NetworkPacket *pkt)
 719 {
 720         RecursiveMutexAutoLock clientslock(m_clients_mutex);
 721         for (auto &client_it : m_clients) {
 722                 RemoteClient *client = client_it.second;
 723
 724                 if (client->net_proto_version != 0) {
 725                         m_con->Send(client->peer_id,
 726                                         clientCommandFactoryTable[pkt->getCommand()].channel, pkt,
 727                                         clientCommandFactoryTable[pkt->getCommand()].reliable);
 728                 }
 729         }
 730 }
 731
 732 RemoteClient* ClientInterface::getClientNoEx(session_t peer_id, ClientState state_min)
 733 {
 734         RecursiveMutexAutoLock clientslock(m_clients_mutex);
 735         RemoteClientMap::const_iterator n = m_clients.find(peer_id);
 736         // The client may not exist; clients are immediately removed if their
 737         // access is denied, and this event occurs later then.
 738         if (n == m_clients.end())
 739                 return NULL;
 740
 741         if (n->second->getState() >= state_min)
 742                 return n->second;
 743
 744         return NULL;
 745 }
 746
 747 RemoteClient* ClientInterface::lockedGetClientNoEx(session_t peer_id, ClientState state_min)
 748 {
 749         RemoteClientMap::const_iterator n = m_clients.find(peer_id);
 750         // The client may not exist; clients are immediately removed if their
 751         // access is denied, and this event occurs later then.
 752         if (n == m_clients.end())
 753                 return NULL;
 754
 755         if (n->second->getState() >= state_min)
 756                 return n->second;
 757
 758         return NULL;
 759 }
 760
 761 ClientState ClientInterface::getClientState(session_t peer_id)
 762 {
 763         RecursiveMutexAutoLock clientslock(m_clients_mutex);
 764         RemoteClientMap::const_iterator n = m_clients.find(peer_id);
 765         // The client may not exist; clients are immediately removed if their
 766         // access is denied, and this event occurs later then.
 767         if (n == m_clients.end())
 768                 return CS_Invalid;
 769
 770         return n->second->getState();
 771 }
 772
 773 void ClientInterface::setPlayerName(session_t peer_id, const std::string &name)
 774 {
 775         RecursiveMutexAutoLock clientslock(m_clients_mutex);
 776         RemoteClientMap::iterator n = m_clients.find(peer_id);
 777         // The client may not exist; clients are immediately removed if their
 778         // access is denied, and this event occurs later then.
 779         if (n != m_clients.end())
 780                 n->second->setName(name);
 781 }
 782
 783 void ClientInterface::DeleteClient(session_t peer_id)
 784 {
 785         RecursiveMutexAutoLock conlock(m_clients_mutex);
 786
 787         // Error check
 788         RemoteClientMap::iterator n = m_clients.find(peer_id);
 789         // The client may not exist; clients are immediately removed if their
 790         // access is denied, and this event occurs later then.
 791         if (n == m_clients.end())
 792                 return;
 793
 794         /*
 795                 Mark objects to be not known by the client
 796         */
 797         //TODO this should be done by client destructor!!!
 798         RemoteClient *client = n->second;
 799         // Handle objects
 800         for (u16 id : client->m_known_objects) {
 801                 // Get object
 802                 ServerActiveObject* obj = m_env->getActiveObject(id);
 803
 804                 if(obj && obj->m_known_by_count > 0)
 805                         obj->m_known_by_count--;
 806         }
 807
 808         // Delete client
 809         delete m_clients[peer_id];
 810         m_clients.erase(peer_id);
 811 }
 812
 813 void ClientInterface::CreateClient(session_t peer_id)
 814 {
 815         RecursiveMutexAutoLock conlock(m_clients_mutex);
 816
 817         // Error check
 818         RemoteClientMap::iterator n = m_clients.find(peer_id);
 819         // The client shouldn't already exist
 820         if (n != m_clients.end()) return;
 821
 822         // Create client
 823         RemoteClient *client = new RemoteClient();
 824         client->peer_id = peer_id;
 825         m_clients[client->peer_id] = client;
 826 }
 827
 828 void ClientInterface::event(session_t peer_id, ClientStateEvent event)
 829 {
 830         {
 831                 RecursiveMutexAutoLock clientlock(m_clients_mutex);
 832
 833                 // Error check
 834                 RemoteClientMap::iterator n = m_clients.find(peer_id);
 835
 836                 // No client to deliver event
 837                 if (n == m_clients.end())
 838                         return;
 839                 n->second->notifyEvent(event);
 840         }
 841
 842         if ((event == CSE_SetClientReady) ||
 843                 (event == CSE_Disconnect)     ||
 844                 (event == CSE_SetDenied))
 845         {
 846                 UpdatePlayerList();
 847         }
 848 }
 849
 850 u16 ClientInterface::getProtocolVersion(session_t peer_id)
 851 {
 852         RecursiveMutexAutoLock conlock(m_clients_mutex);
 853
 854         // Error check
 855         RemoteClientMap::iterator n = m_clients.find(peer_id);
 856
 857         // No client to get version
 858         if (n == m_clients.end())
 859                 return 0;
 860
 861         return n->second->net_proto_version;
 862 }
 863
 864 void ClientInterface::setClientVersion(session_t peer_id, u8 major, u8 minor, u8 patch,
 865                 const std::string &full)
 866 {
 867         RecursiveMutexAutoLock conlock(m_clients_mutex);
 868
 869         // Error check
 870         RemoteClientMap::iterator n = m_clients.find(peer_id);
 871
 872         // No client to set versions
 873         if (n == m_clients.end())
 874                 return;
 875
 876         n->second->setVersionInfo(major, minor, patch, full);
 877 }