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cuberite-2a/src/Server.cpp

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// 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>
////////////////////////////////////////////////////////////////////////////////
// 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("Server Ticker"),
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_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_RCONServer(*this),
m_MaxPlayers(0),
m_bIsHardcore(false),
m_TickThread(*this),
m_ShouldAuthenticate(false),
m_UpTime(0)
{
// 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);
m_OnlyAllowBungeeCord = a_Settings.GetValueSetB("Authentication", "OnlyAllowBungeeCord", false);
m_ProxySharedSecret = a_Settings.GetValueSet("Authentication", "ProxySharedSecret", "");
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.");
}
if (m_ShouldAllowBungeeCord && m_ProxySharedSecret.empty())
{
LOGWARNING("WARNING: There is not a Proxy Forward Secret set up, and any proxy server can forward a player to this server unless closed from the internet.");
}
m_ShouldAllowMultiWorldTabCompletion = a_Settings.GetValueSetB("Server", "AllowMultiWorldTabCompletion", true);
m_ShouldLimitPlayerBlockChanges = a_Settings.GetValueSetB("AntiCheat", "LimitPlayerBlockChanges", true);
const auto ClientViewDistance = a_Settings.GetValueSetI("Server", "DefaultViewDistance", cClientHandle::DEFAULT_VIEW_DISTANCE);
if (ClientViewDistance < cClientHandle::MIN_VIEW_DISTANCE)
{
m_ClientViewDistance = cClientHandle::MIN_VIEW_DISTANCE;
LOGINFO("Setting default view distance to the minimum of %d", m_ClientViewDistance);
}
else if (ClientViewDistance > cClientHandle::MAX_VIEW_DISTANCE)
{
m_ClientViewDistance = cClientHandle::MAX_VIEW_DISTANCE;
LOGINFO("Setting default view distance to the maximum of %d", m_ClientViewDistance);
}
else
{
m_ClientViewDistance = 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);
cCSLock Lock(m_CSClients);
m_Clients.push_back(NewHandle);
return std::move(NewHandle);
}
void cServer::Tick(float a_Dt)
{
// Update server uptime
m_UpTime++;
// Send the tick to the plugins, as well as let the plugin manager reload, if asked to (issue #102):
cPluginManager::Get()->Tick(a_Dt);
// Process all the queued commands:
TickCommands();
// Tick all clients not yet assigned to a world:
TickClients(a_Dt);
// Process all queued tasks
TickQueuedTasks();
}
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();)
{
auto & Client = *itr;
Client->ServerTick(a_Dt);
if (Client->IsDestroyed())
{
// Delete the client later, when CS is not held, to avoid deadlock: https://forum.cuberite.org/thread-374.html
RemoveClients.push_back(std::move(Client));
itr = m_Clients.erase(itr);
continue;
}
++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;
}
m_TickThread.Start();
return true;
}
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::QueueExecuteConsoleCommand(const AString & a_Cmd, cCommandOutputCallback & a_Output)
{
// Put the command into a queue (Alleviates FS #363):
cCSLock Lock(m_CSPendingCommands);
m_PendingCommands.emplace_back(a_Cmd, &a_Output);
}
void cServer::ScheduleTask(cTickTime a_DelayTicks, std::function<void(cServer &)> a_Task)
{
const auto TargetTick = a_DelayTicks + m_UpTime;
// Insert the task into the list of scheduled tasks
{
cCSLock Lock(m_CSTasks);
m_Tasks.emplace_back(TargetTick, std::move(a_Task));
}
}
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")
{
if (split.size() > 1)
{
cPluginManager::Get()->ReloadPlugin(split[1]);
a_Output.Out("Plugin reload scheduled");
}
else
{
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_TickThread.Stop();
// Save all chunks in all worlds, wait for chunks to be sent to the ChunkStorage queue for each world:
cRoot::Get()->SaveAllChunksNow();
// 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, AString && a_Username, const cUUID & a_UUID, 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 (const auto & Client : m_Clients)
{
if (Client->GetUniqueID() == a_ClientID)
{
Client->Authenticate(std::move(a_Username), a_UUID, std::move(a_Properties));
return;
}
}
}
void cServer::TickCommands(void)
{
decltype(m_PendingCommands) PendingCommands;
{
cCSLock Lock(m_CSPendingCommands);
std::swap(PendingCommands, m_PendingCommands);
}
// Execute any pending commands:
for (const auto & Command : PendingCommands)
{
ExecuteConsoleCommand(Command.first, *Command.second);
}
}
void cServer::TickQueuedTasks(void)
{
// Move the tasks to be executed to a seperate vector to avoid deadlocks on
// accessing m_Tasks
decltype(m_Tasks) Tasks;
{
cCSLock Lock(m_CSTasks);
if (m_Tasks.empty())
{
return;
}
// Partition everything to be executed by returning false to move to end
// of list if time reached
auto MoveBeginIterator = std::partition(
m_Tasks.begin(), m_Tasks.end(),
[this](const decltype(m_Tasks)::value_type & a_Task)
{
return a_Task.first >= m_UpTime;
});
// Cut all the due tasks from m_Tasks into Tasks:
Tasks.insert(
Tasks.end(), std::make_move_iterator(MoveBeginIterator),
std::make_move_iterator(m_Tasks.end()));
m_Tasks.erase(MoveBeginIterator, m_Tasks.end());
}
// Execute each task:
for (const auto & Task : Tasks)
{
Task.second(*this);
} // for itr - m_Tasks[]
}
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