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
 103         if (m_nothing_to_send_pause_timer >= 0)
 104                 return;
 105
 106         RemotePlayer *player = env->getPlayer(peer_id);
 107         // This can happen sometimes; clients and players are not in perfect sync.
 108         if (!player)
 109                 return;
 110
 111         PlayerSAO *sao = player->getPlayerSAO();
 112         if (!sao)
 113                 return;
 114
 115         // Won't send anything if already sending
 116         if (m_blocks_sending.size() >= m_max_simul_sends) {
 117                 //infostream<<"Not sending any blocks, Queue full."<<std::endl;
 118                 return;
 119         }
 120
 121         v3f playerpos = sao->getBasePosition();
 122         // if the player is attached, get the velocity from the attached object
 123         LuaEntitySAO *lsao = getAttachedObject(sao, env);
 124         const v3f &playerspeed = lsao? lsao->getVelocity() : player->getSpeed();
 125         v3f playerspeeddir(0,0,0);
 126         if (playerspeed.getLength() > 1.0f * BS)
 127                 playerspeeddir = playerspeed / playerspeed.getLength();
 128         // Predict to next block
 129         v3f playerpos_predicted = playerpos + playerspeeddir * (MAP_BLOCKSIZE * BS);
 130
 131         v3s16 center_nodepos = floatToInt(playerpos_predicted, BS);
 132
 133         v3s16 center = getNodeBlockPos(center_nodepos);
 134
 135         // Camera position and direction
 136         v3f camera_pos = sao->getEyePosition();
 137         v3f camera_dir = v3f(0,0,1);
 138         camera_dir.rotateYZBy(sao->getLookPitch());
 139         camera_dir.rotateXZBy(sao->getRotation().Y);
 140
 141         u16 max_simul_sends_usually = m_max_simul_sends;
 142
 143         /*
 144                 Check the time from last addNode/removeNode.
 145
 146                 Decrease send rate if player is building stuff.
 147         */
 148         m_time_from_building += dtime;
 149         if (m_time_from_building < m_min_time_from_building) {
 150                 max_simul_sends_usually
 151                         = LIMITED_MAX_SIMULTANEOUS_BLOCK_SENDS;
 152         }
 153
 154         /*
 155                 Number of blocks sending + number of blocks selected for sending
 156         */
 157         u32 num_blocks_selected = m_blocks_sending.size();
 158
 159         /*
 160                 next time d will be continued from the d from which the nearest
 161                 unsent block was found this time.
 162
 163                 This is because not necessarily any of the blocks found this
 164                 time are actually sent.
 165         */
 166         s32 new_nearest_unsent_d = -1;
 167
 168         // Get view range and camera fov (radians) from the client
 169         s16 wanted_range = sao->getWantedRange() + 1;
 170         float camera_fov = sao->getFov();
 171
 172         /*
 173                 Get the starting value of the block finder radius.
 174         */
 175         if (m_last_center != center) {
 176                 m_nearest_unsent_d = 0;
 177                 m_last_center = center;
 178         }
 179         // reset the unsent distance if the view angle has changed more that 10% of the fov
 180         // (this matches isBlockInSight which allows for an extra 10%)
 181         if (camera_dir.dotProduct(m_last_camera_dir) < std::cos(camera_fov * 0.1f)) {
 182                 m_nearest_unsent_d = 0;
 183                 m_last_camera_dir = camera_dir;
 184         }
 185         if (m_nearest_unsent_d > 0) {
 186                 // make sure any blocks modified since the last time we sent blocks are resent
 187                 for (const v3s16 &p : m_blocks_modified) {
 188                         m_nearest_unsent_d = std::min(m_nearest_unsent_d, center.getDistanceFrom(p));
 189                 }
 190         }
 191         m_blocks_modified.clear();
 192
 193         s16 d_start = m_nearest_unsent_d;
 194
 195         // Distrust client-sent FOV and get server-set player object property
 196         // zoom FOV (degrees) as a check to avoid hacked clients using FOV to load
 197         // distant world.
 198         // (zoom is disabled by value 0)
 199         float prop_zoom_fov = sao->getZoomFOV() < 0.001f ?
 200                 0.0f :
 201                 std::max(camera_fov, sao->getZoomFOV() * core::DEGTORAD);
 202
 203         const s16 full_d_max = std::min(adjustDist(m_max_send_distance, prop_zoom_fov),
 204                 wanted_range);
 205         const s16 d_opt = std::min(adjustDist(m_block_optimize_distance, prop_zoom_fov),
 206                 wanted_range);
 207         const s16 d_blocks_in_sight = full_d_max * BS * MAP_BLOCKSIZE;
 208
 209         s16 d_max_gen = std::min(adjustDist(m_max_gen_distance, prop_zoom_fov),
 210                 wanted_range);
 211
 212         s16 d_max = full_d_max;
 213
 214         // Don't loop very much at a time
 215         s16 max_d_increment_at_time = 2;
 216         if (d_max > d_start + max_d_increment_at_time)
 217                 d_max = d_start + max_d_increment_at_time;
 218
 219         // cos(angle between velocity and camera) * |velocity|
 220         // Limit to 0.0f in case player moves backwards.
 221         f32 dot = rangelim(camera_dir.dotProduct(playerspeed), 0.0f, 300.0f);
 222
 223         // Reduce the field of view when a player moves and looks forward.
 224         // limit max fov effect to 50%, 60% at 20n/s fly speed
 225         camera_fov = camera_fov / (1 + dot / 300.0f);
 226
 227         s32 nearest_emerged_d = -1;
 228         s32 nearest_emergefull_d = -1;
 229         s32 nearest_sent_d = -1;
 230         //bool queue_is_full = false;
 231
 232         const v3s16 cam_pos_nodes = floatToInt(camera_pos, BS);
 233
 234         s16 d;
 235         for (d = d_start; d <= d_max; d++) {
 236                 /*
 237                         Get the border/face dot coordinates of a "d-radiused"
 238                         box
 239                 */
 240                 std::vector<v3s16> list = FacePositionCache::getFacePositions(d);
 241
 242                 std::vector<v3s16>::iterator li;
 243                 for (li = list.begin(); li != list.end(); ++li) {
 244                         v3s16 p = *li + center;
 245
 246                         /*
 247                                 Send throttling
 248                                 - Don't allow too many simultaneous transfers
 249                                 - EXCEPT when the blocks are very close
 250
 251                                 Also, don't send blocks that are already flying.
 252                         */
 253
 254                         // Start with the usual maximum
 255                         u16 max_simul_dynamic = max_simul_sends_usually;
 256
 257                         // If block is very close, allow full maximum
 258                         if (d <= BLOCK_SEND_DISABLE_LIMITS_MAX_D)
 259                                 max_simul_dynamic = m_max_simul_sends;
 260
 261                         // Don't select too many blocks for sending
 262                         if (num_blocks_selected >= max_simul_dynamic) {
 263                                 //queue_is_full = true;
 264                                 goto queue_full_break;
 265                         }
 266
 267                         // Don't send blocks that are currently being transferred
 268                         if (m_blocks_sending.find(p) != m_blocks_sending.end())
 269                                 continue;
 270
 271                         /*
 272                                 Do not go over max mapgen limit
 273                         */
 274                         if (blockpos_over_max_limit(p))
 275                                 continue;
 276
 277                         // If this is true, inexistent block will be made from scratch
 278                         bool generate = d <= d_max_gen;
 279
 280                         /*
 281                                 Don't generate or send if not in sight
 282                                 FIXME This only works if the client uses a small enough
 283                                 FOV setting. The default of 72 degrees is fine.
 284                                 Also retrieve a smaller view cone in the direction of the player's
 285                                 movement.
 286                                 (0.1 is about 4 degrees)
 287                         */
 288                         f32 dist;
 289                         if (!(isBlockInSight(p, camera_pos, camera_dir, camera_fov,
 290                                                 d_blocks_in_sight, &dist) ||
 291                                         (playerspeed.getLength() > 1.0f * BS &&
 292                                         isBlockInSight(p, camera_pos, playerspeeddir, 0.1f,
 293                                                 d_blocks_in_sight)))) {
 294                                 continue;
 295                         }
 296
 297                         /*
 298                                 Don't send already sent blocks
 299                         */
 300                         if (m_blocks_sent.find(p) != m_blocks_sent.end())
 301                                 continue;
 302
 303                         /*
 304                                 Check if map has this block
 305                         */
 306                         MapBlock *block = env->getMap().getBlockNoCreateNoEx(p);
 307
 308                         bool block_not_found = false;
 309                         if (block) {
 310                                 // Reset usage timer, this block will be of use in the future.
 311                                 block->resetUsageTimer();
 312
 313                                 // Check whether the block exists (with data)
 314                                 if (block->isDummy() || !block->isGenerated())
 315                                         block_not_found = 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->getIsUnderground() && !block->getDayNightDiff())
 326                                                 continue;
 327                                 }
 328
 329                                 if (m_occ_cull && !block_not_found &&
 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) or is
 337                                 not generated and generating new ones is not wanted, skip block.
 338                         */
 339                         if (!generate && block_not_found) {
 340                                 // get next one.
 341                                 continue;
 342                         }
 343
 344                         /*
 345                                 Add inexistent block to emerge queue.
 346                         */
 347                         if (block == NULL || block_not_found) {
 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_sending.find(p) != m_blocks_sending.end()) {
 401                 m_blocks_sending.erase(p);
 402                 // only add to sent blocks if it actually was sending
 403                 // (it might have been modified since)
 404                 m_blocks_sent.insert(p);
 405         } else {
 406                 m_excess_gotblocks++;
 407         }
 408 }
 409
 410 void RemoteClient::SentBlock(v3s16 p)
 411 {
 412         if (m_blocks_sending.find(p) == m_blocks_sending.end())
 413                 m_blocks_sending[p] = 0.0f;
 414         else
 415                 infostream<<"RemoteClient::SentBlock(): Sent block"
 416                                 " already in m_blocks_sending"<<std::endl;
 417 }
 418
 419 void RemoteClient::SetBlockNotSent(v3s16 p)
 420 {
 421         m_nothing_to_send_pause_timer = 0;
 422
 423         // remove the block from sending and sent sets,
 424         // and mark as modified if found
 425         if (m_blocks_sending.erase(p) + m_blocks_sent.erase(p) > 0)
 426                 m_blocks_modified.insert(p);
 427 }
 428
 429 void RemoteClient::SetBlocksNotSent(std::map<v3s16, MapBlock*> &blocks)
 430 {
 431         m_nothing_to_send_pause_timer = 0;
 432
 433         for (auto &block : blocks) {
 434                 v3s16 p = block.first;
 435                 // remove the block from sending and sent sets,
 436                 // and mark as modified if found
 437                 if (m_blocks_sending.erase(p) + m_blocks_sent.erase(p) > 0)
 438                         m_blocks_modified.insert(p);
 439         }
 440 }
 441
 442 void RemoteClient::notifyEvent(ClientStateEvent event)
 443 {
 444         std::ostringstream myerror;
 445         switch (m_state)
 446         {
 447         case CS_Invalid:
 448                 //intentionally do nothing
 449                 break;
 450         case CS_Created:
 451                 switch (event) {
 452                 case CSE_Hello:
 453                         m_state = CS_HelloSent;
 454                         break;
 455                 case CSE_InitLegacy:
 456                         m_state = CS_AwaitingInit2;
 457                         break;
 458                 case CSE_Disconnect:
 459                         m_state = CS_Disconnecting;
 460                         break;
 461                 case CSE_SetDenied:
 462                         m_state = CS_Denied;
 463                         break;
 464                 /* GotInit2 SetDefinitionsSent SetMediaSent */
 465                 default:
 466                         myerror << "Created: Invalid client state transition! " << event;
 467                         throw ClientStateError(myerror.str());
 468                 }
 469                 break;
 470         case CS_Denied:
 471                 /* don't do anything if in denied state */
 472                 break;
 473         case CS_HelloSent:
 474                 switch(event)
 475                 {
 476                 case CSE_AuthAccept:
 477                         m_state = CS_AwaitingInit2;
 478                         if (chosen_mech == AUTH_MECHANISM_SRP ||
 479                                         chosen_mech == AUTH_MECHANISM_LEGACY_PASSWORD)
 480                                 srp_verifier_delete((SRPVerifier *) auth_data);
 481                         chosen_mech = AUTH_MECHANISM_NONE;
 482                         break;
 483                 case CSE_Disconnect:
 484                         m_state = CS_Disconnecting;
 485                         break;
 486                 case CSE_SetDenied:
 487                         m_state = CS_Denied;
 488                         if (chosen_mech == AUTH_MECHANISM_SRP ||
 489                                         chosen_mech == AUTH_MECHANISM_LEGACY_PASSWORD)
 490                                 srp_verifier_delete((SRPVerifier *) auth_data);
 491                         chosen_mech = AUTH_MECHANISM_NONE;
 492                         break;
 493                 default:
 494                         myerror << "HelloSent: Invalid client state transition! " << event;
 495                         throw ClientStateError(myerror.str());
 496                 }
 497                 break;
 498         case CS_AwaitingInit2:
 499                 switch(event)
 500                 {
 501                 case CSE_GotInit2:
 502                         confirmSerializationVersion();
 503                         m_state = CS_InitDone;
 504                         break;
 505                 case CSE_Disconnect:
 506                         m_state = CS_Disconnecting;
 507                         break;
 508                 case CSE_SetDenied:
 509                         m_state = CS_Denied;
 510                         break;
 511
 512                 /* Init SetDefinitionsSent SetMediaSent */
 513                 default:
 514                         myerror << "InitSent: Invalid client state transition! " << event;
 515                         throw ClientStateError(myerror.str());
 516                 }
 517                 break;
 518
 519         case CS_InitDone:
 520                 switch(event)
 521                 {
 522                 case CSE_SetDefinitionsSent:
 523                         m_state = CS_DefinitionsSent;
 524                         break;
 525                 case CSE_Disconnect:
 526                         m_state = CS_Disconnecting;
 527                         break;
 528                 case CSE_SetDenied:
 529                         m_state = CS_Denied;
 530                         break;
 531
 532                 /* Init GotInit2 SetMediaSent */
 533                 default:
 534                         myerror << "InitDone: Invalid client state transition! " << event;
 535                         throw ClientStateError(myerror.str());
 536                 }
 537                 break;
 538         case CS_DefinitionsSent:
 539                 switch(event)
 540                 {
 541                 case CSE_SetClientReady:
 542                         m_state = CS_Active;
 543                         break;
 544                 case CSE_Disconnect:
 545                         m_state = CS_Disconnecting;
 546                         break;
 547                 case CSE_SetDenied:
 548                         m_state = CS_Denied;
 549                         break;
 550                 /* Init GotInit2 SetDefinitionsSent */
 551                 default:
 552                         myerror << "DefinitionsSent: Invalid client state transition! " << event;
 553                         throw ClientStateError(myerror.str());
 554                 }
 555                 break;
 556         case CS_Active:
 557                 switch(event)
 558                 {
 559                 case CSE_SetDenied:
 560                         m_state = CS_Denied;
 561                         break;
 562                 case CSE_Disconnect:
 563                         m_state = CS_Disconnecting;
 564                         break;
 565                 case CSE_SudoSuccess:
 566                         m_state = CS_SudoMode;
 567                         if (chosen_mech == AUTH_MECHANISM_SRP)
 568                                 srp_verifier_delete((SRPVerifier *) auth_data);
 569                         chosen_mech = AUTH_MECHANISM_NONE;
 570                         break;
 571                 /* Init GotInit2 SetDefinitionsSent SetMediaSent SetDenied */
 572                 default:
 573                         myerror << "Active: Invalid client state transition! " << event;
 574                         throw ClientStateError(myerror.str());
 575                         break;
 576                 }
 577                 break;
 578         case CS_SudoMode:
 579                 switch(event)
 580                 {
 581                 case CSE_SetDenied:
 582                         m_state = CS_Denied;
 583                         break;
 584                 case CSE_Disconnect:
 585                         m_state = CS_Disconnecting;
 586                         break;
 587                 case CSE_SudoLeave:
 588                         m_state = CS_Active;
 589                         break;
 590                 default:
 591                         myerror << "Active: Invalid client state transition! " << event;
 592                         throw ClientStateError(myerror.str());
 593                         break;
 594                 }
 595                 break;
 596         case CS_Disconnecting:
 597                 /* we are already disconnecting */
 598                 break;
 599         }
 600 }
 601
 602 u64 RemoteClient::uptime() const
 603 {
 604         return porting::getTimeS() - m_connection_time;
 605 }
 606
 607 ClientInterface::ClientInterface(const std::shared_ptr<con::Connection> & con)
 608 :
 609         m_con(con),
 610         m_env(NULL),
 611         m_print_info_timer(0.0f)
 612 {
 613
 614 }
 615 ClientInterface::~ClientInterface()
 616 {
 617         /*
 618                 Delete clients
 619         */
 620         {
 621                 RecursiveMutexAutoLock clientslock(m_clients_mutex);
 622
 623                 for (auto &client_it : m_clients) {
 624                         // Delete client
 625                         delete client_it.second;
 626                 }
 627         }
 628 }
 629
 630 std::vector<session_t> ClientInterface::getClientIDs(ClientState min_state)
 631 {
 632         std::vector<session_t> reply;
 633         RecursiveMutexAutoLock clientslock(m_clients_mutex);
 634
 635         for (const auto &m_client : m_clients) {
 636                 if (m_client.second->getState() >= min_state)
 637                         reply.push_back(m_client.second->peer_id);
 638         }
 639
 640         return reply;
 641 }
 642
 643 void ClientInterface::markBlockposAsNotSent(const v3s16 &pos)
 644 {
 645         RecursiveMutexAutoLock clientslock(m_clients_mutex);
 646         for (const auto &client : m_clients) {
 647                 if (client.second->getState() >= CS_Active)
 648                         client.second->SetBlockNotSent(pos);
 649         }
 650 }
 651
 652 /**
 653  * Verify if user limit was reached.
 654  * User limit count all clients from HelloSent state (MT protocol user) to Active state
 655  * @return true if user limit was reached
 656  */
 657 bool ClientInterface::isUserLimitReached()
 658 {
 659         return getClientIDs(CS_HelloSent).size() >= g_settings->getU16("max_users");
 660 }
 661
 662 void ClientInterface::step(float dtime)
 663 {
 664         m_print_info_timer += dtime;
 665         if (m_print_info_timer >= 30.0f) {
 666                 m_print_info_timer = 0.0f;
 667                 UpdatePlayerList();
 668         }
 669 }
 670
 671 void ClientInterface::UpdatePlayerList()
 672 {
 673         if (m_env) {
 674                 std::vector<session_t> clients = getClientIDs();
 675                 m_clients_names.clear();
 676
 677
 678                 if (!clients.empty())
 679                         infostream<<"Players:"<<std::endl;
 680
 681                 for (session_t i : clients) {
 682                         RemotePlayer *player = m_env->getPlayer(i);
 683
 684                         if (player == NULL)
 685                                 continue;
 686
 687                         infostream << "* " << player->getName() << "\t";
 688
 689                         {
 690                                 RecursiveMutexAutoLock clientslock(m_clients_mutex);
 691                                 RemoteClient* client = lockedGetClientNoEx(i);
 692                                 if (client)
 693                                         client->PrintInfo(infostream);
 694                         }
 695
 696                         m_clients_names.emplace_back(player->getName());
 697                 }
 698         }
 699 }
 700
 701 void ClientInterface::send(session_t peer_id, u8 channelnum,
 702                 NetworkPacket *pkt, bool reliable)
 703 {
 704         m_con->Send(peer_id, channelnum, pkt, reliable);
 705 }
 706
 707 void ClientInterface::sendToAll(NetworkPacket *pkt)
 708 {
 709         RecursiveMutexAutoLock clientslock(m_clients_mutex);
 710         for (auto &client_it : m_clients) {
 711                 RemoteClient *client = client_it.second;
 712
 713                 if (client->net_proto_version != 0) {
 714                         m_con->Send(client->peer_id,
 715                                         clientCommandFactoryTable[pkt->getCommand()].channel, pkt,
 716                                         clientCommandFactoryTable[pkt->getCommand()].reliable);
 717                 }
 718         }
 719 }
 720
 721 void ClientInterface::sendToAllCompat(NetworkPacket *pkt, NetworkPacket *legacypkt,
 722                 u16 min_proto_ver)
 723 {
 724         RecursiveMutexAutoLock clientslock(m_clients_mutex);
 725         for (auto &client_it : m_clients) {
 726                 RemoteClient *client = client_it.second;
 727                 NetworkPacket *pkt_to_send = nullptr;
 728
 729                 if (client->net_proto_version >= min_proto_ver) {
 730                         pkt_to_send = pkt;
 731                 } else if (client->net_proto_version != 0) {
 732                         pkt_to_send = legacypkt;
 733                 } else {
 734                         warningstream << "Client with unhandled version to handle: '"
 735                                 << client->net_proto_version << "'";
 736                         continue;
 737                 }
 738
 739                 m_con->Send(client->peer_id,
 740                         clientCommandFactoryTable[pkt_to_send->getCommand()].channel,
 741                         pkt_to_send,
 742                         clientCommandFactoryTable[pkt_to_send->getCommand()].reliable);
 743         }
 744 }
 745
 746 RemoteClient* ClientInterface::getClientNoEx(session_t peer_id, ClientState state_min)
 747 {
 748         RecursiveMutexAutoLock clientslock(m_clients_mutex);
 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 RemoteClient* ClientInterface::lockedGetClientNoEx(session_t peer_id, ClientState state_min)
 762 {
 763         RemoteClientMap::const_iterator n = m_clients.find(peer_id);
 764         // The client may not exist; clients are immediately removed if their
 765         // access is denied, and this event occurs later then.
 766         if (n == m_clients.end())
 767                 return NULL;
 768
 769         if (n->second->getState() >= state_min)
 770                 return n->second;
 771
 772         return NULL;
 773 }
 774
 775 ClientState ClientInterface::getClientState(session_t peer_id)
 776 {
 777         RecursiveMutexAutoLock clientslock(m_clients_mutex);
 778         RemoteClientMap::const_iterator n = m_clients.find(peer_id);
 779         // The client may not exist; clients are immediately removed if their
 780         // access is denied, and this event occurs later then.
 781         if (n == m_clients.end())
 782                 return CS_Invalid;
 783
 784         return n->second->getState();
 785 }
 786
 787 void ClientInterface::setPlayerName(session_t peer_id, const std::string &name)
 788 {
 789         RecursiveMutexAutoLock clientslock(m_clients_mutex);
 790         RemoteClientMap::iterator n = m_clients.find(peer_id);
 791         // The client may not exist; clients are immediately removed if their
 792         // access is denied, and this event occurs later then.
 793         if (n != m_clients.end())
 794                 n->second->setName(name);
 795 }
 796
 797 void ClientInterface::DeleteClient(session_t peer_id)
 798 {
 799         RecursiveMutexAutoLock conlock(m_clients_mutex);
 800
 801         // Error check
 802         RemoteClientMap::iterator n = m_clients.find(peer_id);
 803         // The client may not exist; clients are immediately removed if their
 804         // access is denied, and this event occurs later then.
 805         if (n == m_clients.end())
 806                 return;
 807
 808         /*
 809                 Mark objects to be not known by the client
 810         */
 811         //TODO this should be done by client destructor!!!
 812         RemoteClient *client = n->second;
 813         // Handle objects
 814         for (u16 id : client->m_known_objects) {
 815                 // Get object
 816                 ServerActiveObject* obj = m_env->getActiveObject(id);
 817
 818                 if(obj && obj->m_known_by_count > 0)
 819                         obj->m_known_by_count--;
 820         }
 821
 822         // Delete client
 823         delete m_clients[peer_id];
 824         m_clients.erase(peer_id);
 825 }
 826
 827 void ClientInterface::CreateClient(session_t peer_id)
 828 {
 829         RecursiveMutexAutoLock conlock(m_clients_mutex);
 830
 831         // Error check
 832         RemoteClientMap::iterator n = m_clients.find(peer_id);
 833         // The client shouldn't already exist
 834         if (n != m_clients.end()) return;
 835
 836         // Create client
 837         RemoteClient *client = new RemoteClient();
 838         client->peer_id = peer_id;
 839         m_clients[client->peer_id] = client;
 840 }
 841
 842 void ClientInterface::event(session_t peer_id, ClientStateEvent event)
 843 {
 844         {
 845                 RecursiveMutexAutoLock clientlock(m_clients_mutex);
 846
 847                 // Error check
 848                 RemoteClientMap::iterator n = m_clients.find(peer_id);
 849
 850                 // No client to deliver event
 851                 if (n == m_clients.end())
 852                         return;
 853                 n->second->notifyEvent(event);
 854         }
 855
 856         if ((event == CSE_SetClientReady) ||
 857                 (event == CSE_Disconnect)     ||
 858                 (event == CSE_SetDenied))
 859         {
 860                 UpdatePlayerList();
 861         }
 862 }
 863
 864 u16 ClientInterface::getProtocolVersion(session_t peer_id)
 865 {
 866         RecursiveMutexAutoLock conlock(m_clients_mutex);
 867
 868         // Error check
 869         RemoteClientMap::iterator n = m_clients.find(peer_id);
 870
 871         // No client to get version
 872         if (n == m_clients.end())
 873                 return 0;
 874
 875         return n->second->net_proto_version;
 876 }
 877
 878 void ClientInterface::setClientVersion(session_t peer_id, u8 major, u8 minor, u8 patch,
 879                 const std::string &full)
 880 {
 881         RecursiveMutexAutoLock conlock(m_clients_mutex);
 882
 883         // Error check
 884         RemoteClientMap::iterator n = m_clients.find(peer_id);
 885
 886         // No client to set versions
 887         if (n == m_clients.end())
 888                 return;
 889
 890         n->second->setVersionInfo(major, minor, patch, full);
 891 }