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         // Distrust client-sent FOV and get server-set player object property
 200         // zoom FOV (degrees) as a check to avoid hacked clients using FOV to load
 201         // distant world.
 202         float prop_zoom_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 = full_d_max;
 211         s16 d_max_gen = std::min(adjustDist(m_max_gen_distance, prop_zoom_fov),
 212                 wanted_range);
 213
 214         // Don't loop very much at a time, adjust with distance,
 215         // do more work per RTT with greater distances.
 216         s16 max_d_increment_at_time = full_d_max / 9 + 1;
 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                                 Don't send already sent blocks
 300                         */
 301                         if (m_blocks_sent.find(p) != m_blocks_sent.end())
 302                                 continue;
 303
 304                         /*
 305                                 Check if map has this block
 306                         */
 307                         MapBlock *block = env->getMap().getBlockNoCreateNoEx(p);
 308
 309                         bool surely_not_found_on_disk = false;
 310                         bool block_is_invalid = false;
 311                         if (block) {
 312                                 // Reset usage timer, this block will be of use in the future.
 313                                 block->resetUsageTimer();
 314
 315                                 // Block is dummy if data doesn't exist.
 316                                 // It means it has been not found from disk and not generated
 317                                 if (block->isDummy()) {
 318                                         surely_not_found_on_disk = true;
 319                                 }
 320
 321                                 if (!block->isGenerated())
 322                                         block_is_invalid = true;
 323
 324                                 /*
 325                                         If block is not close, don't send it unless it is near
 326                                         ground level.
 327
 328                                         Block is near ground level if night-time mesh
 329                                         differs from day-time mesh.
 330                                 */
 331                                 if (d >= d_opt) {
 332                                         if (!block->getDayNightDiff())
 333                                                 continue;
 334                                 }
 335
 336                                 if (m_occ_cull && !block_is_invalid &&
 337                                                 env->getMap().isBlockOccluded(block, cam_pos_nodes)) {
 338                                         continue;
 339                                 }
 340                         }
 341
 342                         /*
 343                                 If block has been marked to not exist on disk (dummy)
 344                                 and generating new ones is not wanted, skip block.
 345                         */
 346                         if (!generate && surely_not_found_on_disk) {
 347                                 // get next one.
 348                                 continue;
 349                         }
 350
 351                         /*
 352                                 Add inexistent block to emerge queue.
 353                         */
 354                         if (block == NULL || surely_not_found_on_disk || block_is_invalid) {
 355                                 if (emerge->enqueueBlockEmerge(peer_id, p, generate)) {
 356                                         if (nearest_emerged_d == -1)
 357                                                 nearest_emerged_d = d;
 358                                 } else {
 359                                         if (nearest_emergefull_d == -1)
 360                                                 nearest_emergefull_d = d;
 361                                         goto queue_full_break;
 362                                 }
 363
 364                                 // get next one.
 365                                 continue;
 366                         }
 367
 368                         if (nearest_sent_d == -1)
 369                                 nearest_sent_d = d;
 370
 371                         /*
 372                                 Add block to send queue
 373                         */
 374                         PrioritySortedBlockTransfer q((float)dist, p, peer_id);
 375
 376                         dest.push_back(q);
 377
 378                         num_blocks_selected += 1;
 379                 }
 380         }
 381 queue_full_break:
 382
 383         // If nothing was found for sending and nothing was queued for
 384         // emerging, continue next time browsing from here
 385         if (nearest_emerged_d != -1) {
 386                 new_nearest_unsent_d = nearest_emerged_d;
 387         } else if (nearest_emergefull_d != -1) {
 388                 new_nearest_unsent_d = nearest_emergefull_d;
 389         } else {
 390                 if (d > full_d_max) {
 391                         new_nearest_unsent_d = 0;
 392                         m_nothing_to_send_pause_timer = 2.0f;
 393                 } else {
 394                         if (nearest_sent_d != -1)
 395                                 new_nearest_unsent_d = nearest_sent_d;
 396                         else
 397                                 new_nearest_unsent_d = d;
 398                 }
 399         }
 400
 401         if (new_nearest_unsent_d != -1)
 402                 m_nearest_unsent_d = new_nearest_unsent_d;
 403 }
 404
 405 void RemoteClient::GotBlock(v3s16 p)
 406 {
 407         if (m_blocks_modified.find(p) == m_blocks_modified.end()) {
 408                 if (m_blocks_sending.find(p) != m_blocks_sending.end())
 409                         m_blocks_sending.erase(p);
 410                 else
 411                         m_excess_gotblocks++;
 412
 413                 m_blocks_sent.insert(p);
 414         }
 415 }
 416
 417 void RemoteClient::SentBlock(v3s16 p)
 418 {
 419         if (m_blocks_modified.find(p) != m_blocks_modified.end())
 420                 m_blocks_modified.erase(p);
 421
 422         if (m_blocks_sending.find(p) == m_blocks_sending.end())
 423                 m_blocks_sending[p] = 0.0f;
 424         else
 425                 infostream<<"RemoteClient::SentBlock(): Sent block"
 426                                 " already in m_blocks_sending"<<std::endl;
 427 }
 428
 429 void RemoteClient::SetBlockNotSent(v3s16 p)
 430 {
 431         m_nearest_unsent_d = 0;
 432         m_nothing_to_send_pause_timer = 0;
 433
 434         if (m_blocks_sending.find(p) != m_blocks_sending.end())
 435                 m_blocks_sending.erase(p);
 436         if (m_blocks_sent.find(p) != m_blocks_sent.end())
 437                 m_blocks_sent.erase(p);
 438         m_blocks_modified.insert(p);
 439 }
 440
 441 void RemoteClient::SetBlocksNotSent(std::map<v3s16, MapBlock*> &blocks)
 442 {
 443         m_nearest_unsent_d = 0;
 444         m_nothing_to_send_pause_timer = 0;
 445
 446         for (auto &block : blocks) {
 447                 v3s16 p = block.first;
 448                 m_blocks_modified.insert(p);
 449
 450                 if (m_blocks_sending.find(p) != m_blocks_sending.end())
 451                         m_blocks_sending.erase(p);
 452                 if (m_blocks_sent.find(p) != m_blocks_sent.end())
 453                         m_blocks_sent.erase(p);
 454         }
 455 }
 456
 457 void RemoteClient::notifyEvent(ClientStateEvent event)
 458 {
 459         std::ostringstream myerror;
 460         switch (m_state)
 461         {
 462         case CS_Invalid:
 463                 //intentionally do nothing
 464                 break;
 465         case CS_Created:
 466                 switch (event) {
 467                 case CSE_Hello:
 468                         m_state = CS_HelloSent;
 469                         break;
 470                 case CSE_InitLegacy:
 471                         m_state = CS_AwaitingInit2;
 472                         break;
 473                 case CSE_Disconnect:
 474                         m_state = CS_Disconnecting;
 475                         break;
 476                 case CSE_SetDenied:
 477                         m_state = CS_Denied;
 478                         break;
 479                 /* GotInit2 SetDefinitionsSent SetMediaSent */
 480                 default:
 481                         myerror << "Created: Invalid client state transition! " << event;
 482                         throw ClientStateError(myerror.str());
 483                 }
 484                 break;
 485         case CS_Denied:
 486                 /* don't do anything if in denied state */
 487                 break;
 488         case CS_HelloSent:
 489                 switch(event)
 490                 {
 491                 case CSE_AuthAccept:
 492                         m_state = CS_AwaitingInit2;
 493                         if (chosen_mech == AUTH_MECHANISM_SRP ||
 494                                         chosen_mech == AUTH_MECHANISM_LEGACY_PASSWORD)
 495                                 srp_verifier_delete((SRPVerifier *) auth_data);
 496                         chosen_mech = AUTH_MECHANISM_NONE;
 497                         break;
 498                 case CSE_Disconnect:
 499                         m_state = CS_Disconnecting;
 500                         break;
 501                 case CSE_SetDenied:
 502                         m_state = CS_Denied;
 503                         if (chosen_mech == AUTH_MECHANISM_SRP ||
 504                                         chosen_mech == AUTH_MECHANISM_LEGACY_PASSWORD)
 505                                 srp_verifier_delete((SRPVerifier *) auth_data);
 506                         chosen_mech = AUTH_MECHANISM_NONE;
 507                         break;
 508                 default:
 509                         myerror << "HelloSent: Invalid client state transition! " << event;
 510                         throw ClientStateError(myerror.str());
 511                 }
 512                 break;
 513         case CS_AwaitingInit2:
 514                 switch(event)
 515                 {
 516                 case CSE_GotInit2:
 517                         confirmSerializationVersion();
 518                         m_state = CS_InitDone;
 519                         break;
 520                 case CSE_Disconnect:
 521                         m_state = CS_Disconnecting;
 522                         break;
 523                 case CSE_SetDenied:
 524                         m_state = CS_Denied;
 525                         break;
 526
 527                 /* Init SetDefinitionsSent SetMediaSent */
 528                 default:
 529                         myerror << "InitSent: Invalid client state transition! " << event;
 530                         throw ClientStateError(myerror.str());
 531                 }
 532                 break;
 533
 534         case CS_InitDone:
 535                 switch(event)
 536                 {
 537                 case CSE_SetDefinitionsSent:
 538                         m_state = CS_DefinitionsSent;
 539                         break;
 540                 case CSE_Disconnect:
 541                         m_state = CS_Disconnecting;
 542                         break;
 543                 case CSE_SetDenied:
 544                         m_state = CS_Denied;
 545                         break;
 546
 547                 /* Init GotInit2 SetMediaSent */
 548                 default:
 549                         myerror << "InitDone: Invalid client state transition! " << event;
 550                         throw ClientStateError(myerror.str());
 551                 }
 552                 break;
 553         case CS_DefinitionsSent:
 554                 switch(event)
 555                 {
 556                 case CSE_SetClientReady:
 557                         m_state = CS_Active;
 558                         break;
 559                 case CSE_Disconnect:
 560                         m_state = CS_Disconnecting;
 561                         break;
 562                 case CSE_SetDenied:
 563                         m_state = CS_Denied;
 564                         break;
 565                 /* Init GotInit2 SetDefinitionsSent */
 566                 default:
 567                         myerror << "DefinitionsSent: Invalid client state transition! " << event;
 568                         throw ClientStateError(myerror.str());
 569                 }
 570                 break;
 571         case CS_Active:
 572                 switch(event)
 573                 {
 574                 case CSE_SetDenied:
 575                         m_state = CS_Denied;
 576                         break;
 577                 case CSE_Disconnect:
 578                         m_state = CS_Disconnecting;
 579                         break;
 580                 case CSE_SudoSuccess:
 581                         m_state = CS_SudoMode;
 582                         if (chosen_mech == AUTH_MECHANISM_SRP)
 583                                 srp_verifier_delete((SRPVerifier *) auth_data);
 584                         chosen_mech = AUTH_MECHANISM_NONE;
 585                         break;
 586                 /* Init GotInit2 SetDefinitionsSent SetMediaSent SetDenied */
 587                 default:
 588                         myerror << "Active: Invalid client state transition! " << event;
 589                         throw ClientStateError(myerror.str());
 590                         break;
 591                 }
 592                 break;
 593         case CS_SudoMode:
 594                 switch(event)
 595                 {
 596                 case CSE_SetDenied:
 597                         m_state = CS_Denied;
 598                         break;
 599                 case CSE_Disconnect:
 600                         m_state = CS_Disconnecting;
 601                         break;
 602                 case CSE_SudoLeave:
 603                         m_state = CS_Active;
 604                         break;
 605                 default:
 606                         myerror << "Active: Invalid client state transition! " << event;
 607                         throw ClientStateError(myerror.str());
 608                         break;
 609                 }
 610                 break;
 611         case CS_Disconnecting:
 612                 /* we are already disconnecting */
 613                 break;
 614         }
 615 }
 616
 617 u64 RemoteClient::uptime() const
 618 {
 619         return porting::getTimeS() - m_connection_time;
 620 }
 621
 622 ClientInterface::ClientInterface(const std::shared_ptr<con::Connection> & con)
 623 :
 624         m_con(con),
 625         m_env(NULL),
 626         m_print_info_timer(0.0f)
 627 {
 628
 629 }
 630 ClientInterface::~ClientInterface()
 631 {
 632         /*
 633                 Delete clients
 634         */
 635         {
 636                 MutexAutoLock clientslock(m_clients_mutex);
 637
 638                 for (auto &client_it : m_clients) {
 639                         // Delete client
 640                         delete client_it.second;
 641                 }
 642         }
 643 }
 644
 645 std::vector<session_t> ClientInterface::getClientIDs(ClientState min_state)
 646 {
 647         std::vector<session_t> reply;
 648         MutexAutoLock clientslock(m_clients_mutex);
 649
 650         for (const auto &m_client : m_clients) {
 651                 if (m_client.second->getState() >= min_state)
 652                         reply.push_back(m_client.second->peer_id);
 653         }
 654
 655         return reply;
 656 }
 657
 658 void ClientInterface::markBlockposAsNotSent(const v3s16 &pos)
 659 {
 660         MutexAutoLock clientslock(m_clients_mutex);
 661         for (const auto &client : m_clients) {
 662                 if (client.second->getState() >= CS_Active)
 663                         client.second->SetBlockNotSent(pos);
 664         }
 665 }
 666
 667 /**
 668  * Verify if user limit was reached.
 669  * User limit count all clients from HelloSent state (MT protocol user) to Active state
 670  * @return true if user limit was reached
 671  */
 672 bool ClientInterface::isUserLimitReached()
 673 {
 674         return getClientIDs(CS_HelloSent).size() >= g_settings->getU16("max_users");
 675 }
 676
 677 void ClientInterface::step(float dtime)
 678 {
 679         m_print_info_timer += dtime;
 680         if (m_print_info_timer >= 30.0f) {
 681                 m_print_info_timer = 0.0f;
 682                 UpdatePlayerList();
 683         }
 684 }
 685
 686 void ClientInterface::UpdatePlayerList()
 687 {
 688         if (m_env) {
 689                 std::vector<session_t> clients = getClientIDs();
 690                 m_clients_names.clear();
 691
 692
 693                 if (!clients.empty())
 694                         infostream<<"Players:"<<std::endl;
 695
 696                 for (session_t i : clients) {
 697                         RemotePlayer *player = m_env->getPlayer(i);
 698
 699                         if (player == NULL)
 700                                 continue;
 701
 702                         infostream << "* " << player->getName() << "\t";
 703
 704                         {
 705                                 MutexAutoLock clientslock(m_clients_mutex);
 706                                 RemoteClient* client = lockedGetClientNoEx(i);
 707                                 if (client)
 708                                         client->PrintInfo(infostream);
 709                         }
 710
 711                         m_clients_names.emplace_back(player->getName());
 712                 }
 713         }
 714 }
 715
 716 void ClientInterface::send(session_t peer_id, u8 channelnum,
 717                 NetworkPacket *pkt, bool reliable)
 718 {
 719         m_con->Send(peer_id, channelnum, pkt, reliable);
 720 }
 721
 722 void ClientInterface::sendToAll(NetworkPacket *pkt)
 723 {
 724         MutexAutoLock clientslock(m_clients_mutex);
 725         for (auto &client_it : m_clients) {
 726                 RemoteClient *client = client_it.second;
 727
 728                 if (client->net_proto_version != 0) {
 729                         m_con->Send(client->peer_id,
 730                                         clientCommandFactoryTable[pkt->getCommand()].channel, pkt,
 731                                         clientCommandFactoryTable[pkt->getCommand()].reliable);
 732                 }
 733         }
 734 }
 735
 736 void ClientInterface::sendToAllCompat(NetworkPacket *pkt, NetworkPacket *legacypkt,
 737                 u16 min_proto_ver)
 738 {
 739         MutexAutoLock clientslock(m_clients_mutex);
 740         for (auto &client_it : m_clients) {
 741                 RemoteClient *client = client_it.second;
 742                 NetworkPacket *pkt_to_send = nullptr;
 743
 744                 if (client->net_proto_version >= min_proto_ver) {
 745                         pkt_to_send = pkt;
 746                 } else if (client->net_proto_version != 0) {
 747                         pkt_to_send = legacypkt;
 748                 } else {
 749                         warningstream << "Client with unhandled version to handle: '"
 750                                 << client->net_proto_version << "'";
 751                         continue;
 752                 }
 753
 754                 m_con->Send(client->peer_id,
 755                         clientCommandFactoryTable[pkt_to_send->getCommand()].channel,
 756                         pkt_to_send,
 757                         clientCommandFactoryTable[pkt_to_send->getCommand()].reliable);
 758         }
 759 }
 760
 761 RemoteClient* ClientInterface::getClientNoEx(session_t peer_id, ClientState state_min)
 762 {
 763         MutexAutoLock 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 NULL;
 769
 770         if (n->second->getState() >= state_min)
 771                 return n->second;
 772
 773         return NULL;
 774 }
 775
 776 RemoteClient* ClientInterface::lockedGetClientNoEx(session_t peer_id, ClientState state_min)
 777 {
 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 NULL;
 783
 784         if (n->second->getState() >= state_min)
 785                 return n->second;
 786
 787         return NULL;
 788 }
 789
 790 ClientState ClientInterface::getClientState(session_t peer_id)
 791 {
 792         MutexAutoLock clientslock(m_clients_mutex);
 793         RemoteClientMap::const_iterator n = m_clients.find(peer_id);
 794         // The client may not exist; clients are immediately removed if their
 795         // access is denied, and this event occurs later then.
 796         if (n == m_clients.end())
 797                 return CS_Invalid;
 798
 799         return n->second->getState();
 800 }
 801
 802 void ClientInterface::setPlayerName(session_t peer_id, const std::string &name)
 803 {
 804         MutexAutoLock clientslock(m_clients_mutex);
 805         RemoteClientMap::iterator n = m_clients.find(peer_id);
 806         // The client may not exist; clients are immediately removed if their
 807         // access is denied, and this event occurs later then.
 808         if (n != m_clients.end())
 809                 n->second->setName(name);
 810 }
 811
 812 void ClientInterface::DeleteClient(session_t peer_id)
 813 {
 814         MutexAutoLock conlock(m_clients_mutex);
 815
 816         // Error check
 817         RemoteClientMap::iterator n = m_clients.find(peer_id);
 818         // The client may not exist; clients are immediately removed if their
 819         // access is denied, and this event occurs later then.
 820         if (n == m_clients.end())
 821                 return;
 822
 823         /*
 824                 Mark objects to be not known by the client
 825         */
 826         //TODO this should be done by client destructor!!!
 827         RemoteClient *client = n->second;
 828         // Handle objects
 829         for (u16 id : client->m_known_objects) {
 830                 // Get object
 831                 ServerActiveObject* obj = m_env->getActiveObject(id);
 832
 833                 if(obj && obj->m_known_by_count > 0)
 834                         obj->m_known_by_count--;
 835         }
 836
 837         // Delete client
 838         delete m_clients[peer_id];
 839         m_clients.erase(peer_id);
 840 }
 841
 842 void ClientInterface::CreateClient(session_t peer_id)
 843 {
 844         MutexAutoLock conlock(m_clients_mutex);
 845
 846         // Error check
 847         RemoteClientMap::iterator n = m_clients.find(peer_id);
 848         // The client shouldn't already exist
 849         if (n != m_clients.end()) return;
 850
 851         // Create client
 852         RemoteClient *client = new RemoteClient();
 853         client->peer_id = peer_id;
 854         m_clients[client->peer_id] = client;
 855 }
 856
 857 void ClientInterface::event(session_t peer_id, ClientStateEvent event)
 858 {
 859         {
 860                 MutexAutoLock clientlock(m_clients_mutex);
 861
 862                 // Error check
 863                 RemoteClientMap::iterator n = m_clients.find(peer_id);
 864
 865                 // No client to deliver event
 866                 if (n == m_clients.end())
 867                         return;
 868                 n->second->notifyEvent(event);
 869         }
 870
 871         if ((event == CSE_SetClientReady) ||
 872                 (event == CSE_Disconnect)     ||
 873                 (event == CSE_SetDenied))
 874         {
 875                 UpdatePlayerList();
 876         }
 877 }
 878
 879 u16 ClientInterface::getProtocolVersion(session_t peer_id)
 880 {
 881         MutexAutoLock conlock(m_clients_mutex);
 882
 883         // Error check
 884         RemoteClientMap::iterator n = m_clients.find(peer_id);
 885
 886         // No client to get version
 887         if (n == m_clients.end())
 888                 return 0;
 889
 890         return n->second->net_proto_version;
 891 }
 892
 893 void ClientInterface::setClientVersion(session_t peer_id, u8 major, u8 minor, u8 patch,
 894                 const std::string &full)
 895 {
 896         MutexAutoLock conlock(m_clients_mutex);
 897
 898         // Error check
 899         RemoteClientMap::iterator n = m_clients.find(peer_id);
 900
 901         // No client to set versions
 902         if (n == m_clients.end())
 903                 return;
 904
 905         n->second->setVersionInfo(major, minor, patch, full);
 906 }