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 (radians) from the client
 196         s16 wanted_range = sao->getWantedRange() + 1;
 197         float camera_fov = sao->getFov();
 198
 199         // If below the heuristic zoom threshold (see adjustDist() in numeric.cpp)
 200         // distrust client-sent FOV and get server-set player object property
 201         // zoom FOV (degrees) as a check to avoid hacked clients using FOV to load
 202         // distant world.
 203         // 0.888 radians is slightly larger than the zoom threshold of 1.775 / 2
 204         // radians.
 205         if (camera_fov < 0.888f) {
 206                 float prop_zoom_fov = sao->getZoomFOV();
 207                 // If zoom is disabled by value 0
 208                 if (prop_zoom_fov < 0.001f)
 209                         camera_fov = 0.888f;
 210                 else
 211                         // Degrees -> radians
 212                         camera_fov = prop_zoom_fov * core::DEGTORAD;
 213         }
 214
 215         const s16 full_d_max = std::min(adjustDist(m_max_send_distance, camera_fov),
 216                 wanted_range);
 217         const s16 d_opt = std::min(adjustDist(m_block_optimize_distance, camera_fov),
 218                 wanted_range);
 219         const s16 d_blocks_in_sight = full_d_max * BS * MAP_BLOCKSIZE;
 220
 221         s16 d_max = full_d_max;
 222         s16 d_max_gen = std::min(adjustDist(m_max_gen_distance, camera_fov),
 223                 wanted_range);
 224
 225         // Don't loop very much at a time, adjust with distance,
 226         // do more work per RTT with greater distances.
 227         s16 max_d_increment_at_time = full_d_max / 9 + 1;
 228         if (d_max > d_start + max_d_increment_at_time)
 229                 d_max = d_start + max_d_increment_at_time;
 230
 231         // cos(angle between velocity and camera) * |velocity|
 232         // Limit to 0.0f in case player moves backwards.
 233         f32 dot = rangelim(camera_dir.dotProduct(playerspeed), 0.0f, 300.0f);
 234
 235         // Reduce the field of view when a player moves and looks forward.
 236         // limit max fov effect to 50%, 60% at 20n/s fly speed
 237         camera_fov = camera_fov / (1 + dot / 300.0f);
 238
 239         s32 nearest_emerged_d = -1;
 240         s32 nearest_emergefull_d = -1;
 241         s32 nearest_sent_d = -1;
 242         //bool queue_is_full = false;
 243
 244         const v3s16 cam_pos_nodes = floatToInt(camera_pos, BS);
 245
 246         s16 d;
 247         for (d = d_start; d <= d_max; d++) {
 248                 /*
 249                         Get the border/face dot coordinates of a "d-radiused"
 250                         box
 251                 */
 252                 std::vector<v3s16> list = FacePositionCache::getFacePositions(d);
 253
 254                 std::vector<v3s16>::iterator li;
 255                 for (li = list.begin(); li != list.end(); ++li) {
 256                         v3s16 p = *li + center;
 257
 258                         /*
 259                                 Send throttling
 260                                 - Don't allow too many simultaneous transfers
 261                                 - EXCEPT when the blocks are very close
 262
 263                                 Also, don't send blocks that are already flying.
 264                         */
 265
 266                         // Start with the usual maximum
 267                         u16 max_simul_dynamic = max_simul_sends_usually;
 268
 269                         // If block is very close, allow full maximum
 270                         if (d <= BLOCK_SEND_DISABLE_LIMITS_MAX_D)
 271                                 max_simul_dynamic = m_max_simul_sends;
 272
 273                         // Don't select too many blocks for sending
 274                         if (num_blocks_selected >= max_simul_dynamic) {
 275                                 //queue_is_full = true;
 276                                 goto queue_full_break;
 277                         }
 278
 279                         // Don't send blocks that are currently being transferred
 280                         if (m_blocks_sending.find(p) != m_blocks_sending.end())
 281                                 continue;
 282
 283                         /*
 284                                 Do not go over max mapgen limit
 285                         */
 286                         if (blockpos_over_max_limit(p))
 287                                 continue;
 288
 289                         // If this is true, inexistent block will be made from scratch
 290                         bool generate = d <= d_max_gen;
 291
 292                         /*
 293                                 Don't generate or send if not in sight
 294                                 FIXME This only works if the client uses a small enough
 295                                 FOV setting. The default of 72 degrees is fine.
 296                                 Also retrieve a smaller view cone in the direction of the player's
 297                                 movement.
 298                                 (0.1 is about 4 degrees)
 299                         */
 300                         f32 dist;
 301                         if (!(isBlockInSight(p, camera_pos, camera_dir, camera_fov,
 302                                                 d_blocks_in_sight, &dist) ||
 303                                         (playerspeed.getLength() > 1.0f * BS &&
 304                                         isBlockInSight(p, camera_pos, playerspeeddir, 0.1f,
 305                                                 d_blocks_in_sight)))) {
 306                                 continue;
 307                         }
 308
 309                         /*
 310                                 Don't send already sent blocks
 311                         */
 312                         if (m_blocks_sent.find(p) != m_blocks_sent.end())
 313                                 continue;
 314
 315                         /*
 316                                 Check if map has this block
 317                         */
 318                         MapBlock *block = env->getMap().getBlockNoCreateNoEx(p);
 319
 320                         bool surely_not_found_on_disk = false;
 321                         bool block_is_invalid = false;
 322                         if (block) {
 323                                 // Reset usage timer, this block will be of use in the future.
 324                                 block->resetUsageTimer();
 325
 326                                 // Block is dummy if data doesn't exist.
 327                                 // It means it has been not found from disk and not generated
 328                                 if (block->isDummy()) {
 329                                         surely_not_found_on_disk = true;
 330                                 }
 331
 332                                 if (!block->isGenerated())
 333                                         block_is_invalid = true;
 334
 335                                 /*
 336                                         If block is not close, don't send it unless it is near
 337                                         ground level.
 338
 339                                         Block is near ground level if night-time mesh
 340                                         differs from day-time mesh.
 341                                 */
 342                                 if (d >= d_opt) {
 343                                         if (!block->getDayNightDiff())
 344                                                 continue;
 345                                 }
 346
 347                                 if (m_occ_cull && !block_is_invalid &&
 348                                                 env->getMap().isBlockOccluded(block, cam_pos_nodes)) {
 349                                         continue;
 350                                 }
 351                         }
 352
 353                         /*
 354                                 If block has been marked to not exist on disk (dummy)
 355                                 and generating new ones is not wanted, skip block.
 356                         */
 357                         if (!generate && surely_not_found_on_disk) {
 358                                 // get next one.
 359                                 continue;
 360                         }
 361
 362                         /*
 363                                 Add inexistent block to emerge queue.
 364                         */
 365                         if (block == NULL || surely_not_found_on_disk || block_is_invalid) {
 366                                 if (emerge->enqueueBlockEmerge(peer_id, p, generate)) {
 367                                         if (nearest_emerged_d == -1)
 368                                                 nearest_emerged_d = d;
 369                                 } else {
 370                                         if (nearest_emergefull_d == -1)
 371                                                 nearest_emergefull_d = d;
 372                                         goto queue_full_break;
 373                                 }
 374
 375                                 // get next one.
 376                                 continue;
 377                         }
 378
 379                         if (nearest_sent_d == -1)
 380                                 nearest_sent_d = d;
 381
 382                         /*
 383                                 Add block to send queue
 384                         */
 385                         PrioritySortedBlockTransfer q((float)dist, p, peer_id);
 386
 387                         dest.push_back(q);
 388
 389                         num_blocks_selected += 1;
 390                 }
 391         }
 392 queue_full_break:
 393
 394         // If nothing was found for sending and nothing was queued for
 395         // emerging, continue next time browsing from here
 396         if (nearest_emerged_d != -1) {
 397                 new_nearest_unsent_d = nearest_emerged_d;
 398         } else if (nearest_emergefull_d != -1) {
 399                 new_nearest_unsent_d = nearest_emergefull_d;
 400         } else {
 401                 if (d > full_d_max) {
 402                         new_nearest_unsent_d = 0;
 403                         m_nothing_to_send_pause_timer = 2.0f;
 404                 } else {
 405                         if (nearest_sent_d != -1)
 406                                 new_nearest_unsent_d = nearest_sent_d;
 407                         else
 408                                 new_nearest_unsent_d = d;
 409                 }
 410         }
 411
 412         if (new_nearest_unsent_d != -1)
 413                 m_nearest_unsent_d = new_nearest_unsent_d;
 414 }
 415
 416 void RemoteClient::GotBlock(v3s16 p)
 417 {
 418         if (m_blocks_modified.find(p) == m_blocks_modified.end()) {
 419                 if (m_blocks_sending.find(p) != m_blocks_sending.end())
 420                         m_blocks_sending.erase(p);
 421                 else
 422                         m_excess_gotblocks++;
 423
 424                 m_blocks_sent.insert(p);
 425         }
 426 }
 427
 428 void RemoteClient::SentBlock(v3s16 p)
 429 {
 430         if (m_blocks_modified.find(p) != m_blocks_modified.end())
 431                 m_blocks_modified.erase(p);
 432
 433         if (m_blocks_sending.find(p) == m_blocks_sending.end())
 434                 m_blocks_sending[p] = 0.0f;
 435         else
 436                 infostream<<"RemoteClient::SentBlock(): Sent block"
 437                                 " already in m_blocks_sending"<<std::endl;
 438 }
 439
 440 void RemoteClient::SetBlockNotSent(v3s16 p)
 441 {
 442         m_nearest_unsent_d = 0;
 443         m_nothing_to_send_pause_timer = 0;
 444
 445         if (m_blocks_sending.find(p) != m_blocks_sending.end())
 446                 m_blocks_sending.erase(p);
 447         if (m_blocks_sent.find(p) != m_blocks_sent.end())
 448                 m_blocks_sent.erase(p);
 449         m_blocks_modified.insert(p);
 450 }
 451
 452 void RemoteClient::SetBlocksNotSent(std::map<v3s16, MapBlock*> &blocks)
 453 {
 454         m_nearest_unsent_d = 0;
 455         m_nothing_to_send_pause_timer = 0;
 456
 457         for (auto &block : blocks) {
 458                 v3s16 p = block.first;
 459                 m_blocks_modified.insert(p);
 460
 461                 if (m_blocks_sending.find(p) != m_blocks_sending.end())
 462                         m_blocks_sending.erase(p);
 463                 if (m_blocks_sent.find(p) != m_blocks_sent.end())
 464                         m_blocks_sent.erase(p);
 465         }
 466 }
 467
 468 void RemoteClient::notifyEvent(ClientStateEvent event)
 469 {
 470         std::ostringstream myerror;
 471         switch (m_state)
 472         {
 473         case CS_Invalid:
 474                 //intentionally do nothing
 475                 break;
 476         case CS_Created:
 477                 switch (event) {
 478                 case CSE_Hello:
 479                         m_state = CS_HelloSent;
 480                         break;
 481                 case CSE_InitLegacy:
 482                         m_state = CS_AwaitingInit2;
 483                         break;
 484                 case CSE_Disconnect:
 485                         m_state = CS_Disconnecting;
 486                         break;
 487                 case CSE_SetDenied:
 488                         m_state = CS_Denied;
 489                         break;
 490                 /* GotInit2 SetDefinitionsSent SetMediaSent */
 491                 default:
 492                         myerror << "Created: Invalid client state transition! " << event;
 493                         throw ClientStateError(myerror.str());
 494                 }
 495                 break;
 496         case CS_Denied:
 497                 /* don't do anything if in denied state */
 498                 break;
 499         case CS_HelloSent:
 500                 switch(event)
 501                 {
 502                 case CSE_AuthAccept:
 503                         m_state = CS_AwaitingInit2;
 504                         if (chosen_mech == AUTH_MECHANISM_SRP ||
 505                                         chosen_mech == AUTH_MECHANISM_LEGACY_PASSWORD)
 506                                 srp_verifier_delete((SRPVerifier *) auth_data);
 507                         chosen_mech = AUTH_MECHANISM_NONE;
 508                         break;
 509                 case CSE_Disconnect:
 510                         m_state = CS_Disconnecting;
 511                         break;
 512                 case CSE_SetDenied:
 513                         m_state = CS_Denied;
 514                         if (chosen_mech == AUTH_MECHANISM_SRP ||
 515                                         chosen_mech == AUTH_MECHANISM_LEGACY_PASSWORD)
 516                                 srp_verifier_delete((SRPVerifier *) auth_data);
 517                         chosen_mech = AUTH_MECHANISM_NONE;
 518                         break;
 519                 default:
 520                         myerror << "HelloSent: Invalid client state transition! " << event;
 521                         throw ClientStateError(myerror.str());
 522                 }
 523                 break;
 524         case CS_AwaitingInit2:
 525                 switch(event)
 526                 {
 527                 case CSE_GotInit2:
 528                         confirmSerializationVersion();
 529                         m_state = CS_InitDone;
 530                         break;
 531                 case CSE_Disconnect:
 532                         m_state = CS_Disconnecting;
 533                         break;
 534                 case CSE_SetDenied:
 535                         m_state = CS_Denied;
 536                         break;
 537
 538                 /* Init SetDefinitionsSent SetMediaSent */
 539                 default:
 540                         myerror << "InitSent: Invalid client state transition! " << event;
 541                         throw ClientStateError(myerror.str());
 542                 }
 543                 break;
 544
 545         case CS_InitDone:
 546                 switch(event)
 547                 {
 548                 case CSE_SetDefinitionsSent:
 549                         m_state = CS_DefinitionsSent;
 550                         break;
 551                 case CSE_Disconnect:
 552                         m_state = CS_Disconnecting;
 553                         break;
 554                 case CSE_SetDenied:
 555                         m_state = CS_Denied;
 556                         break;
 557
 558                 /* Init GotInit2 SetMediaSent */
 559                 default:
 560                         myerror << "InitDone: Invalid client state transition! " << event;
 561                         throw ClientStateError(myerror.str());
 562                 }
 563                 break;
 564         case CS_DefinitionsSent:
 565                 switch(event)
 566                 {
 567                 case CSE_SetClientReady:
 568                         m_state = CS_Active;
 569                         break;
 570                 case CSE_Disconnect:
 571                         m_state = CS_Disconnecting;
 572                         break;
 573                 case CSE_SetDenied:
 574                         m_state = CS_Denied;
 575                         break;
 576                 /* Init GotInit2 SetDefinitionsSent */
 577                 default:
 578                         myerror << "DefinitionsSent: Invalid client state transition! " << event;
 579                         throw ClientStateError(myerror.str());
 580                 }
 581                 break;
 582         case CS_Active:
 583                 switch(event)
 584                 {
 585                 case CSE_SetDenied:
 586                         m_state = CS_Denied;
 587                         break;
 588                 case CSE_Disconnect:
 589                         m_state = CS_Disconnecting;
 590                         break;
 591                 case CSE_SudoSuccess:
 592                         m_state = CS_SudoMode;
 593                         if (chosen_mech == AUTH_MECHANISM_SRP)
 594                                 srp_verifier_delete((SRPVerifier *) auth_data);
 595                         chosen_mech = AUTH_MECHANISM_NONE;
 596                         break;
 597                 /* Init GotInit2 SetDefinitionsSent SetMediaSent SetDenied */
 598                 default:
 599                         myerror << "Active: Invalid client state transition! " << event;
 600                         throw ClientStateError(myerror.str());
 601                         break;
 602                 }
 603                 break;
 604         case CS_SudoMode:
 605                 switch(event)
 606                 {
 607                 case CSE_SetDenied:
 608                         m_state = CS_Denied;
 609                         break;
 610                 case CSE_Disconnect:
 611                         m_state = CS_Disconnecting;
 612                         break;
 613                 case CSE_SudoLeave:
 614                         m_state = CS_Active;
 615                         break;
 616                 default:
 617                         myerror << "Active: Invalid client state transition! " << event;
 618                         throw ClientStateError(myerror.str());
 619                         break;
 620                 }
 621                 break;
 622         case CS_Disconnecting:
 623                 /* we are already disconnecting */
 624                 break;
 625         }
 626 }
 627
 628 u64 RemoteClient::uptime() const
 629 {
 630         return porting::getTimeS() - m_connection_time;
 631 }
 632
 633 ClientInterface::ClientInterface(const std::shared_ptr<con::Connection> & con)
 634 :
 635         m_con(con),
 636         m_env(NULL),
 637         m_print_info_timer(0.0f)
 638 {
 639
 640 }
 641 ClientInterface::~ClientInterface()
 642 {
 643         /*
 644                 Delete clients
 645         */
 646         {
 647                 MutexAutoLock clientslock(m_clients_mutex);
 648
 649                 for (auto &client_it : m_clients) {
 650                         // Delete client
 651                         delete client_it.second;
 652                 }
 653         }
 654 }
 655
 656 std::vector<session_t> ClientInterface::getClientIDs(ClientState min_state)
 657 {
 658         std::vector<session_t> reply;
 659         MutexAutoLock clientslock(m_clients_mutex);
 660
 661         for (const auto &m_client : m_clients) {
 662                 if (m_client.second->getState() >= min_state)
 663                         reply.push_back(m_client.second->peer_id);
 664         }
 665
 666         return reply;
 667 }
 668
 669 void ClientInterface::markBlockposAsNotSent(const v3s16 &pos)
 670 {
 671         MutexAutoLock clientslock(m_clients_mutex);
 672         for (const auto &client : m_clients) {
 673                 if (client.second->getState() >= CS_Active)
 674                         client.second->SetBlockNotSent(pos);
 675         }
 676 }
 677
 678 /**
 679  * Verify if user limit was reached.
 680  * User limit count all clients from HelloSent state (MT protocol user) to Active state
 681  * @return true if user limit was reached
 682  */
 683 bool ClientInterface::isUserLimitReached()
 684 {
 685         return getClientIDs(CS_HelloSent).size() >= g_settings->getU16("max_users");
 686 }
 687
 688 void ClientInterface::step(float dtime)
 689 {
 690         m_print_info_timer += dtime;
 691         if (m_print_info_timer >= 30.0f) {
 692                 m_print_info_timer = 0.0f;
 693                 UpdatePlayerList();
 694         }
 695 }
 696
 697 void ClientInterface::UpdatePlayerList()
 698 {
 699         if (m_env) {
 700                 std::vector<session_t> clients = getClientIDs();
 701                 m_clients_names.clear();
 702
 703
 704                 if (!clients.empty())
 705                         infostream<<"Players:"<<std::endl;
 706
 707                 for (session_t i : clients) {
 708                         RemotePlayer *player = m_env->getPlayer(i);
 709
 710                         if (player == NULL)
 711                                 continue;
 712
 713                         infostream << "* " << player->getName() << "\t";
 714
 715                         {
 716                                 MutexAutoLock clientslock(m_clients_mutex);
 717                                 RemoteClient* client = lockedGetClientNoEx(i);
 718                                 if (client)
 719                                         client->PrintInfo(infostream);
 720                         }
 721
 722                         m_clients_names.emplace_back(player->getName());
 723                 }
 724         }
 725 }
 726
 727 void ClientInterface::send(session_t peer_id, u8 channelnum,
 728                 NetworkPacket *pkt, bool reliable)
 729 {
 730         m_con->Send(peer_id, channelnum, pkt, reliable);
 731 }
 732
 733 void ClientInterface::sendToAll(NetworkPacket *pkt)
 734 {
 735         MutexAutoLock clientslock(m_clients_mutex);
 736         for (auto &client_it : m_clients) {
 737                 RemoteClient *client = client_it.second;
 738
 739                 if (client->net_proto_version != 0) {
 740                         m_con->Send(client->peer_id,
 741                                         clientCommandFactoryTable[pkt->getCommand()].channel, pkt,
 742                                         clientCommandFactoryTable[pkt->getCommand()].reliable);
 743                 }
 744         }
 745 }
 746
 747 void ClientInterface::sendToAllCompat(NetworkPacket *pkt, NetworkPacket *legacypkt,
 748                 u16 min_proto_ver)
 749 {
 750         MutexAutoLock clientslock(m_clients_mutex);
 751         for (auto &client_it : m_clients) {
 752                 RemoteClient *client = client_it.second;
 753                 NetworkPacket *pkt_to_send = nullptr;
 754
 755                 if (client->net_proto_version >= min_proto_ver) {
 756                         pkt_to_send = pkt;
 757                 } else if (client->net_proto_version != 0) {
 758                         pkt_to_send = legacypkt;
 759                 } else {
 760                         warningstream << "Client with unhandled version to handle: '"
 761                                 << client->net_proto_version << "'";
 762                         continue;
 763                 }
 764
 765                 m_con->Send(client->peer_id,
 766                         clientCommandFactoryTable[pkt_to_send->getCommand()].channel,
 767                         pkt_to_send,
 768                         clientCommandFactoryTable[pkt_to_send->getCommand()].reliable);
 769         }
 770 }
 771
 772 RemoteClient* ClientInterface::getClientNoEx(session_t peer_id, ClientState state_min)
 773 {
 774         MutexAutoLock clientslock(m_clients_mutex);
 775         RemoteClientMap::const_iterator n = m_clients.find(peer_id);
 776         // The client may not exist; clients are immediately removed if their
 777         // access is denied, and this event occurs later then.
 778         if (n == m_clients.end())
 779                 return NULL;
 780
 781         if (n->second->getState() >= state_min)
 782                 return n->second;
 783
 784         return NULL;
 785 }
 786
 787 RemoteClient* ClientInterface::lockedGetClientNoEx(session_t peer_id, ClientState state_min)
 788 {
 789         RemoteClientMap::const_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                 return NULL;
 794
 795         if (n->second->getState() >= state_min)
 796                 return n->second;
 797
 798         return NULL;
 799 }
 800
 801 ClientState ClientInterface::getClientState(session_t peer_id)
 802 {
 803         MutexAutoLock clientslock(m_clients_mutex);
 804         RemoteClientMap::const_iterator n = m_clients.find(peer_id);
 805         // The client may not exist; clients are immediately removed if their
 806         // access is denied, and this event occurs later then.
 807         if (n == m_clients.end())
 808                 return CS_Invalid;
 809
 810         return n->second->getState();
 811 }
 812
 813 void ClientInterface::setPlayerName(session_t peer_id, const std::string &name)
 814 {
 815         MutexAutoLock clientslock(m_clients_mutex);
 816         RemoteClientMap::iterator n = m_clients.find(peer_id);
 817         // The client may not exist; clients are immediately removed if their
 818         // access is denied, and this event occurs later then.
 819         if (n != m_clients.end())
 820                 n->second->setName(name);
 821 }
 822
 823 void ClientInterface::DeleteClient(session_t peer_id)
 824 {
 825         MutexAutoLock conlock(m_clients_mutex);
 826
 827         // Error check
 828         RemoteClientMap::iterator n = m_clients.find(peer_id);
 829         // The client may not exist; clients are immediately removed if their
 830         // access is denied, and this event occurs later then.
 831         if (n == m_clients.end())
 832                 return;
 833
 834         /*
 835                 Mark objects to be not known by the client
 836         */
 837         //TODO this should be done by client destructor!!!
 838         RemoteClient *client = n->second;
 839         // Handle objects
 840         for (u16 id : client->m_known_objects) {
 841                 // Get object
 842                 ServerActiveObject* obj = m_env->getActiveObject(id);
 843
 844                 if(obj && obj->m_known_by_count > 0)
 845                         obj->m_known_by_count--;
 846         }
 847
 848         // Delete client
 849         delete m_clients[peer_id];
 850         m_clients.erase(peer_id);
 851 }
 852
 853 void ClientInterface::CreateClient(session_t peer_id)
 854 {
 855         MutexAutoLock conlock(m_clients_mutex);
 856
 857         // Error check
 858         RemoteClientMap::iterator n = m_clients.find(peer_id);
 859         // The client shouldn't already exist
 860         if (n != m_clients.end()) return;
 861
 862         // Create client
 863         RemoteClient *client = new RemoteClient();
 864         client->peer_id = peer_id;
 865         m_clients[client->peer_id] = client;
 866 }
 867
 868 void ClientInterface::event(session_t peer_id, ClientStateEvent event)
 869 {
 870         {
 871                 MutexAutoLock clientlock(m_clients_mutex);
 872
 873                 // Error check
 874                 RemoteClientMap::iterator n = m_clients.find(peer_id);
 875
 876                 // No client to deliver event
 877                 if (n == m_clients.end())
 878                         return;
 879                 n->second->notifyEvent(event);
 880         }
 881
 882         if ((event == CSE_SetClientReady) ||
 883                 (event == CSE_Disconnect)     ||
 884                 (event == CSE_SetDenied))
 885         {
 886                 UpdatePlayerList();
 887         }
 888 }
 889
 890 u16 ClientInterface::getProtocolVersion(session_t peer_id)
 891 {
 892         MutexAutoLock conlock(m_clients_mutex);
 893
 894         // Error check
 895         RemoteClientMap::iterator n = m_clients.find(peer_id);
 896
 897         // No client to get version
 898         if (n == m_clients.end())
 899                 return 0;
 900
 901         return n->second->net_proto_version;
 902 }
 903
 904 void ClientInterface::setClientVersion(session_t peer_id, u8 major, u8 minor, u8 patch,
 905                 const std::string &full)
 906 {
 907         MutexAutoLock conlock(m_clients_mutex);
 908
 909         // Error check
 910         RemoteClientMap::iterator n = m_clients.find(peer_id);
 911
 912         // No client to set versions
 913         if (n == m_clients.end())
 914                 return;
 915
 916         n->second->setVersionInfo(major, minor, patch, full);
 917 }