summaryrefslogtreecommitdiffstats
path: root/src/Server.cpp
blob: d9a0ced27a723027e3cad8dcdaaace46e0bbdc23 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
// ReDucTor is an awesome guy who helped me a lot

#include "Globals.h"  // NOTE: MSVC stupidness requires this to be the same across all modules

#include "Server.h"
#include "ClientHandle.h"
#include "Mobs/Monster.h"
#include "Root.h"
#include "World.h"
#include "Bindings/PluginManager.h"
#include "ChatColor.h"
#include "Entities/Player.h"
#include "Inventory.h"
#include "Item.h"
#include "FurnaceRecipe.h"
#include "WebAdmin.h"
#include "Protocol/ProtocolRecognizer.h"
#include "CommandOutput.h"
#include "FastRandom.h"

#include "IniFile.h"

#include <fstream>
#include <sstream>
#include <iostream>

extern "C"
{
	#include "zlib/zlib.h"
}





typedef std::list< cClientHandle* > ClientList;





////////////////////////////////////////////////////////////////////////////////
// cServerListenCallbacks:

class cServerListenCallbacks:
	public cNetwork::cListenCallbacks
{
	cServer & m_Server;
	UInt16 m_Port;

	virtual cTCPLink::cCallbacksPtr OnIncomingConnection(const AString & a_RemoteIPAddress, UInt16 a_RemotePort) override
	{
		return m_Server.OnConnectionAccepted(a_RemoteIPAddress);
	}

	virtual void OnAccepted(cTCPLink & a_Link) override {}

	virtual void OnError(int a_ErrorCode, const AString & a_ErrorMsg) override
	{
		LOGWARNING("Cannot listen on port %d: %d (%s).", m_Port, a_ErrorCode, a_ErrorMsg.c_str());
	}

public:
	cServerListenCallbacks(cServer & a_Server, UInt16 a_Port):
		m_Server(a_Server),
		m_Port(a_Port)
	{
	}
};





////////////////////////////////////////////////////////////////////////////////
// cServer::cTickThread:

cServer::cTickThread::cTickThread(cServer & a_Server) :
	Super("ServerTickThread"),
	m_Server(a_Server)
{
}





void cServer::cTickThread::Execute(void)
{
	auto LastTime = std::chrono::steady_clock::now();
	static const auto msPerTick = std::chrono::milliseconds(50);

	while (!m_ShouldTerminate)
	{
		auto NowTime = std::chrono::steady_clock::now();
		auto msec = std::chrono::duration_cast<std::chrono::milliseconds>(NowTime - LastTime).count();
		m_ShouldTerminate = !m_Server.Tick(static_cast<float>(msec));
		auto TickTime = std::chrono::steady_clock::now() - NowTime;

		if (TickTime < msPerTick)
		{
			// Stretch tick time until it's at least msPerTick
			std::this_thread::sleep_for(msPerTick - TickTime);
		}

		LastTime = NowTime;
	}
}





////////////////////////////////////////////////////////////////////////////////
// cServer:

cServer::cServer(void) :
	m_PlayerCount(0),
	m_ClientViewDistance(0),
	m_bIsConnected(false),
	m_bRestarting(false),
	m_RCONServer(*this),
	m_MaxPlayers(0),
	m_bIsHardcore(false),
	m_TickThread(*this),
	m_ShouldAuthenticate(false),
	m_ShouldLoadOfflinePlayerData(false),
	m_ShouldLoadNamedPlayerData(true)
{
	// Initialize the LuaStateTracker singleton before the app goes multithreaded:
	cLuaStateTracker::GetStats();
}





void cServer::ClientMovedToWorld(const cClientHandle * a_Client)
{
	cCSLock Lock(m_CSClients);
	m_ClientsToRemove.push_back(const_cast<cClientHandle *>(a_Client));
}





void cServer::PlayerCreated()
{
	m_PlayerCount++;
}





void cServer::PlayerDestroyed()
{
	m_PlayerCount--;
}





bool cServer::InitServer(cSettingsRepositoryInterface & a_Settings, bool a_ShouldAuth)
{
	m_Description = a_Settings.GetValueSet("Server", "Description", "Cuberite - in C++!");
	m_ShutdownMessage = a_Settings.GetValueSet("Server", "ShutdownMessage", "Server shutdown");
	m_MaxPlayers = static_cast<size_t>(a_Settings.GetValueSetI("Server", "MaxPlayers", 100));
	m_bIsHardcore = a_Settings.GetValueSetB("Server", "HardcoreEnabled", false);
	m_bAllowMultiLogin = a_Settings.GetValueSetB("Server", "AllowMultiLogin", false);
	m_ResourcePackUrl = a_Settings.GetValueSet("Server", "ResourcePackUrl", "");

	m_FaviconData = Base64Encode(cFile::ReadWholeFile(AString("favicon.png")));  // Will return empty string if file nonexistant; client doesn't mind

	if (m_bIsConnected)
	{
		LOGERROR("ERROR: Trying to initialize server while server is already running!");
		return false;
	}

	LOGINFO("Compatible clients: %s", MCS_CLIENT_VERSIONS);
	LOGD("Compatible protocol versions %s", MCS_PROTOCOL_VERSIONS);

	m_Ports = ReadUpgradeIniPorts(a_Settings, "Server", "Ports", "Port", "PortsIPv6", "25565");

	m_RCONServer.Initialize(a_Settings);

	m_bIsConnected = true;

	m_ServerID = "-";
	m_ShouldAuthenticate = a_ShouldAuth;
	if (m_ShouldAuthenticate)
	{
		auto & rand = GetRandomProvider();
		unsigned int r1 = rand.RandInt<unsigned int>(1000000000U, 0x7fffffffU);
		unsigned int r2 = rand.RandInt<unsigned int>(1000000000U, 0x7fffffffU);
		std::ostringstream sid;
		sid << std::hex << r1;
		sid << std::hex << r2;
		m_ServerID = sid.str();
		m_ServerID.resize(16, '0');
	}

	// Check if both BungeeCord and online mode are on, if so, warn the admin:
	m_ShouldAllowBungeeCord = a_Settings.GetValueSetB("Authentication", "AllowBungeeCord", false);
	if (m_ShouldAllowBungeeCord && m_ShouldAuthenticate)
	{
		LOGWARNING("WARNING: BungeeCord is allowed and server set to online mode. This is unsafe and will not work properly. Disable either authentication or BungeeCord in settings.ini.");
	}

	m_ShouldAllowMultiWorldTabCompletion = a_Settings.GetValueSetB("Server", "AllowMultiWorldTabCompletion", true);
	m_ShouldLimitPlayerBlockChanges = a_Settings.GetValueSetB("AntiCheat", "LimitPlayerBlockChanges", true);
	m_ShouldLoadOfflinePlayerData = a_Settings.GetValueSetB("PlayerData", "LoadOfflinePlayerData", false);
	m_ShouldLoadNamedPlayerData   = a_Settings.GetValueSetB("PlayerData", "LoadNamedPlayerData", true);

	m_ClientViewDistance = a_Settings.GetValueSetI("Server", "DefaultViewDistance", cClientHandle::DEFAULT_VIEW_DISTANCE);
	if (m_ClientViewDistance < cClientHandle::MIN_VIEW_DISTANCE)
	{
		m_ClientViewDistance = cClientHandle::MIN_VIEW_DISTANCE;
		LOGINFO("Setting default viewdistance to the minimum of %d", m_ClientViewDistance);
	}
	if (m_ClientViewDistance > cClientHandle::MAX_VIEW_DISTANCE)
	{
		m_ClientViewDistance = cClientHandle::MAX_VIEW_DISTANCE;
		LOGINFO("Setting default viewdistance to the maximum of %d", m_ClientViewDistance);
	}

	PrepareKeys();

	return true;
}





bool cServer::RegisterForgeMod(const AString & a_ModName, const AString & a_ModVersion, UInt32 a_ProtocolVersionNumber)
{
	auto & Mods = RegisteredForgeMods(a_ProtocolVersionNumber);

	return Mods.insert({a_ModName, a_ModVersion}).second;
}





void cServer::UnregisterForgeMod(const AString & a_ModName, UInt32 a_ProtocolVersionNumber)
{
	auto & Mods = RegisteredForgeMods(a_ProtocolVersionNumber);

	auto it = Mods.find(a_ModName);
	if (it != Mods.end())
	{
		Mods.erase(it);
	}
}





AStringMap & cServer::RegisteredForgeMods(const UInt32 a_Protocol)
{
	auto it = m_ForgeModsByVersion.find(a_Protocol);

	if (it == m_ForgeModsByVersion.end())
	{
		AStringMap mods;
		m_ForgeModsByVersion.insert({a_Protocol, mods});
		return m_ForgeModsByVersion.find(a_Protocol)->second;
	}

	return it->second;
}





const AStringMap & cServer::GetRegisteredForgeMods(const UInt32 a_Protocol)
{
	return RegisteredForgeMods(a_Protocol);
}





bool cServer::IsPlayerInQueue(const AString & a_Username)
{
	cCSLock Lock(m_CSClients);
	for (const auto & client : m_Clients)
	{
		if ((client->GetUsername()).compare(a_Username) == 0)
		{
			return true;
		}
	}
	return false;
}





void cServer::PrepareKeys(void)
{
	LOGD("Generating protocol encryption keypair...");
	VERIFY(m_PrivateKey.Generate(1024));
	m_PublicKeyDER = m_PrivateKey.GetPubKeyDER();
}





cTCPLink::cCallbacksPtr cServer::OnConnectionAccepted(const AString & a_RemoteIPAddress)
{
	LOGD("Client \"%s\" connected!", a_RemoteIPAddress.c_str());
	cClientHandlePtr NewHandle = std::make_shared<cClientHandle>(a_RemoteIPAddress, m_ClientViewDistance);
	NewHandle->SetSelf(NewHandle);
	cCSLock Lock(m_CSClients);
	m_Clients.push_back(NewHandle);
	return std::move(NewHandle);
}





bool cServer::Tick(float a_Dt)
{
	// Send the tick to the plugins, as well as let the plugin manager reload, if asked to (issue #102):
	cPluginManager::Get()->Tick(a_Dt);

	// Let the Root process all the queued commands:
	cRoot::Get()->TickCommands();

	// Tick all clients not yet assigned to a world:
	TickClients(a_Dt);

	if (!m_bRestarting)
	{
		return true;
	}
	else
	{
		m_bRestarting = false;
		m_RestartEvent.Set();
		return false;
	}
}





void cServer::TickClients(float a_Dt)
{
	cClientHandlePtrs RemoveClients;
	{
		cCSLock Lock(m_CSClients);

		// Remove clients that have moved to a world (the world will be ticking them from now on)
		for (auto itr = m_ClientsToRemove.begin(), end = m_ClientsToRemove.end(); itr != end; ++itr)
		{
			for (auto itrC = m_Clients.begin(), endC = m_Clients.end(); itrC != endC; ++itrC)
			{
				if (itrC->get() == *itr)
				{
					m_Clients.erase(itrC);
					break;
				}
			}
		}  // for itr - m_ClientsToRemove[]
		m_ClientsToRemove.clear();

		// Tick the remaining clients, take out those that have been destroyed into RemoveClients
		for (auto itr = m_Clients.begin(); itr != m_Clients.end();)
		{
			if ((*itr)->IsDestroyed())
			{
				// Delete the client later, when CS is not held, to avoid deadlock: https://forum.cuberite.org/thread-374.html
				RemoveClients.push_back(*itr);
				itr = m_Clients.erase(itr);
				continue;
			}
			(*itr)->ServerTick(a_Dt);
			++itr;
		}  // for itr - m_Clients[]
	}

	// Delete the clients that have been destroyed
	RemoveClients.clear();
}





bool cServer::Start(void)
{
	for (const auto & port: m_Ports)
	{
		UInt16 PortNum;
		if (!StringToInteger(port, PortNum))
		{
			LOGWARNING("Invalid port specified for server: \"%s\". Ignoring.", port.c_str());
			continue;
		}
		auto Handle = cNetwork::Listen(PortNum, std::make_shared<cServerListenCallbacks>(*this, PortNum));
		if (Handle->IsListening())
		{
			m_ServerHandles.push_back(Handle);
		}
	}  // for port - Ports[]
	if (m_ServerHandles.empty())
	{
		LOGERROR("Couldn't open any ports. Aborting the server");
		return false;
	}
	return m_TickThread.Start();
}





bool cServer::Command(cClientHandle & a_Client, AString & a_Cmd)
{
	bool Res = cRoot::Get()->DoWithPlayerByUUID(
		a_Client.GetUUID(),
		[&](cPlayer & a_Player)
		{
			return cRoot::Get()->GetPluginManager()->CallHookChat(a_Player, a_Cmd);
		}
	);
	return Res;
}





void cServer::ExecuteConsoleCommand(const AString & a_Cmd, cCommandOutputCallback & a_Output)
{
	AStringVector split = StringSplit(a_Cmd, " ");
	if (split.empty())
	{
		return;
	}

	// "stop" and "restart" are handled in cRoot::ExecuteConsoleCommand, our caller, due to its access to controlling variables

	// "help" and "reload" are to be handled by Cuberite, so that they work no matter what
	if (split[0] == "help")
	{
		PrintHelp(split, a_Output);
		a_Output.Finished();
		return;
	}
	else if (split[0] == "reload")
	{
		cPluginManager::Get()->ReloadPlugins();
		a_Output.Finished();
		return;
	}
	else if (split[0] == "reloadplugins")
	{
		cPluginManager::Get()->ReloadPlugins();
		a_Output.Out("Plugins reloaded");
		a_Output.Finished();
		return;
	}
	else if (split[0] == "reloadweb")
	{
		cRoot::Get()->GetWebAdmin()->Reload();
		a_Output.Out("WebAdmin configuration reloaded");
		a_Output.Finished();
		return;
	}
	else if (split[0] == "load")
	{
		if (split.size() > 1)
		{
			cPluginManager::Get()->RefreshPluginList();  // Refresh the plugin list, so that if the plugin was added just now, it is loadable
			a_Output.Out(cPluginManager::Get()->LoadPlugin(split[1]) ? "Plugin loaded" : "Error occurred loading plugin");
		}
		else
		{
			a_Output.Out("Usage: load <PluginFolder>");
		}
		a_Output.Finished();
		return;
	}
	else if (split[0] == "unload")
	{
		if (split.size() > 1)
		{
			cPluginManager::Get()->UnloadPlugin(split[1]);
			a_Output.Out("Plugin unload scheduled");
		}
		else
		{
			a_Output.Out("Usage: unload <PluginFolder>");
		}
		a_Output.Finished();
		return;
	}
	if (split[0] == "destroyentities")
	{
		cRoot::Get()->ForEachWorld([](cWorld & a_World)
			{
				a_World.ForEachEntity([](cEntity & a_Entity)
					{
						if (!a_Entity.IsPlayer())
						{
							a_Entity.Destroy();
						}
						return false;
					}
				);
				return false;
			}
		);
		a_Output.Out("Destroyed all entities");
		a_Output.Finished();
		return;
	}

	// There is currently no way a plugin can do these (and probably won't ever be):
	else if (split[0].compare("chunkstats") == 0)
	{
		cRoot::Get()->LogChunkStats(a_Output);
		a_Output.Finished();
		return;
	}

	else if (split[0].compare("luastats") == 0)
	{
		a_Output.Out(cLuaStateTracker::GetStats());
		a_Output.Finished();
		return;
	}
	else if (cPluginManager::Get()->ExecuteConsoleCommand(split, a_Output, a_Cmd))
	{
		a_Output.Finished();
		return;
	}

	a_Output.Out("Unknown command, type 'help' for all commands.");
	a_Output.Finished();
}





void cServer::PrintHelp(const AStringVector & a_Split, cCommandOutputCallback & a_Output)
{
	UNUSED(a_Split);
	typedef std::pair<AString, AString> AStringPair;
	typedef std::vector<AStringPair> AStringPairs;

	class cCallback :
		public cPluginManager::cCommandEnumCallback
	{
	public:
		cCallback(void) : m_MaxLen(0) {}

		virtual bool Command(const AString & a_Command, const cPlugin * a_Plugin, const AString & a_Permission, const AString & a_HelpString) override
		{
		UNUSED(a_Plugin);
		UNUSED(a_Permission);
			if (!a_HelpString.empty())
			{
				m_Commands.push_back(AStringPair(a_Command, a_HelpString));
				if (m_MaxLen < a_Command.length())
				{
					m_MaxLen = a_Command.length();
				}
			}
			return false;
		}

		AStringPairs m_Commands;
		size_t m_MaxLen;
	} Callback;
	cPluginManager::Get()->ForEachConsoleCommand(Callback);
	std::sort(Callback.m_Commands.begin(), Callback.m_Commands.end());
	for (AStringPairs::const_iterator itr = Callback.m_Commands.begin(), end = Callback.m_Commands.end(); itr != end; ++itr)
	{
		const AStringPair & cmd = *itr;
		a_Output.Out(Printf("%-*s - %s\n", static_cast<int>(Callback.m_MaxLen), cmd.first.c_str(), cmd.second.c_str()));
	}  // for itr - Callback.m_Commands[]
}





void cServer::BindBuiltInConsoleCommands(void)
{
	// Create an empty handler - the actual handling for the commands is performed before they are handed off to cPluginManager
	class cEmptyHandler:
		public cPluginManager::cCommandHandler
	{
		virtual bool ExecuteCommand(
			const AStringVector & a_Split,
			cPlayer * a_Player,
			const AString & a_Command,
			cCommandOutputCallback * a_Output = nullptr
		) override
		{
			return false;
		}
	};
	auto handler = std::make_shared<cEmptyHandler>();

	// Register internal commands:
	cPluginManager * PlgMgr = cPluginManager::Get();
	PlgMgr->BindConsoleCommand("help",            nullptr, handler, "Shows the available commands");
	PlgMgr->BindConsoleCommand("reload",          nullptr, handler, "Reloads all plugins");
	PlgMgr->BindConsoleCommand("reloadweb",       nullptr, handler, "Reloads the webadmin configuration");
	PlgMgr->BindConsoleCommand("restart",         nullptr, handler, "Restarts the server cleanly");
	PlgMgr->BindConsoleCommand("stop",            nullptr, handler, "Stops the server cleanly");
	PlgMgr->BindConsoleCommand("chunkstats",      nullptr, handler, "Displays detailed chunk memory statistics");
	PlgMgr->BindConsoleCommand("load",            nullptr, handler, "Adds and enables the specified plugin");
	PlgMgr->BindConsoleCommand("unload",          nullptr, handler, "Disables the specified plugin");
	PlgMgr->BindConsoleCommand("destroyentities", nullptr, handler, "Destroys all entities in all worlds");
}





void cServer::Shutdown(void)
{
	// Stop listening on all sockets:
	for (const auto & srv: m_ServerHandles)
	{
		srv->Close();
	}
	m_ServerHandles.clear();

	// Notify the tick thread and wait for it to terminate:
	m_bRestarting = true;
	m_RestartEvent.Wait();

	cRoot::Get()->SaveAllChunks();

	// Remove all clients:
	cCSLock Lock(m_CSClients);
	for (auto itr = m_Clients.begin(); itr != m_Clients.end(); ++itr)
	{
		(*itr)->Destroy();
	}
	m_Clients.clear();
}





void cServer::KickUser(int a_ClientID, const AString & a_Reason)
{
	cCSLock Lock(m_CSClients);
	for (auto itr = m_Clients.begin(); itr != m_Clients.end(); ++itr)
	{
		if ((*itr)->GetUniqueID() == a_ClientID)
		{
			(*itr)->Kick(a_Reason);
		}
	}  // for itr - m_Clients[]
}





void cServer::AuthenticateUser(int a_ClientID, const AString & a_Name, const cUUID & a_UUID, const Json::Value & a_Properties)
{
	cCSLock Lock(m_CSClients);

	// Check max players condition within lock (expect server and authenticator thread to both call here)
	if (GetNumPlayers() >= GetMaxPlayers())
	{
		KickUser(a_ClientID, "The server is currently full :(" "\n" "Try again later?");
		return;
	}

	for (auto itr = m_Clients.begin(); itr != m_Clients.end(); ++itr)
	{
		if ((*itr)->GetUniqueID() == a_ClientID)
		{
			(*itr)->Authenticate(a_Name, a_UUID, a_Properties);
			return;
		}
	}  // for itr - m_Clients[]
}