1 files changed, 333 insertions, 0 deletions

diff --git a/src/RCONServer.cpp b/src/RCONServer.cpp
new file mode 100644
index 000000000..72f2d9ba9
--- /dev/null
+++ b/src/RCONServer.cpp
@@ -0,0 +1,333 @@
+
+// RCONServer.cpp
+
+// Implements the cRCONServer class representing the RCON server
+
+#include "Globals.h"
+#include "inifile/iniFile.h"
+#include "RCONServer.h"
+#include "Server.h"
+#include "Root.h"
+#include "CommandOutput.h"
+
+
+
+
+
+// Disable MSVC warnings:
+#if defined(_MSC_VER)
+	#pragma warning(push)
+	#pragma warning(disable:4355)  // 'this' : used in base member initializer list
+#endif
+
+
+
+
+
+enum
+{
+	// Client -> Server:
+	RCON_PACKET_COMMAND = 2,
+	RCON_PACKET_LOGIN   = 3,
+	
+	// Server -> Client:
+	RCON_PACKET_RESPONSE = 2,
+} ;
+
+
+
+
+
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// cRCONCommandOutput:
+
+class cRCONCommandOutput :
+	public cCommandOutputCallback
+{
+public:
+	cRCONCommandOutput(cRCONServer::cConnection & a_Connection, int a_RequestID) :
+		m_Connection(a_Connection),
+		m_RequestID(a_RequestID)
+	{
+	}
+	
+	// cCommandOutputCallback overrides:
+	virtual void Out(const AString & a_Text) override
+	{
+		m_Buffer.append(a_Text);
+	}
+	
+	virtual void Finished(void) override
+	{
+		m_Connection.SendResponse(m_RequestID, RCON_PACKET_RESPONSE, m_Buffer.size(), m_Buffer.c_str());
+		delete this;
+	}
+	
+protected:
+	cRCONServer::cConnection & m_Connection;
+	int m_RequestID;
+	AString m_Buffer;
+} ;
+
+
+
+
+
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// cRCONServer:
+
+cRCONServer::cRCONServer(cServer & a_Server) :
+	m_Server(a_Server),
+	m_ListenThread4(*this, cSocket::IPv4, "RCON IPv4"),
+	m_ListenThread6(*this, cSocket::IPv6, "RCON IPv6")
+{
+}
+
+
+
+
+
+cRCONServer::~cRCONServer()
+{
+	m_ListenThread4.Stop();
+	m_ListenThread6.Stop();
+}
+
+
+
+
+
+void cRCONServer::Initialize(cIniFile & a_IniFile)
+{
+	if (!a_IniFile.GetValueSetB("RCON", "Enabled", false))
+	{
+		return;
+	}
+
+	// Read the password, don't allow an empty one:
+	m_Password = a_IniFile.GetValueSet("RCON", "Password", "");
+	if (m_Password.empty())
+	{
+		LOGWARNING("RCON is requested, but the password is not set. RCON is now disabled.");
+		return;
+	}
+	
+	// Read and initialize both IPv4 and IPv6 ports for RCON
+	bool HasAnyPorts = false;
+	AString Ports4 = a_IniFile.GetValueSet("RCON", "PortsIPv4", "25575");
+	if (m_ListenThread4.Initialize(Ports4))
+	{
+		HasAnyPorts = true;
+		m_ListenThread4.Start();
+	}
+	AString Ports6 = a_IniFile.GetValueSet("RCON", "PortsIPv6", "25575");
+	if (m_ListenThread6.Initialize(Ports6))
+	{
+		HasAnyPorts = true;
+		m_ListenThread6.Start();
+	}
+	if (!HasAnyPorts)
+	{
+		LOGWARNING("RCON is requested, but no ports are specified. Specify at least one port in PortsIPv4 or PortsIPv6. RCON is now disabled.");
+		return;
+	}
+}
+
+
+
+
+
+void cRCONServer::OnConnectionAccepted(cSocket & a_Socket)
+{
+	if (!a_Socket.IsValid())
+	{
+		return;
+	}
+
+	LOG("RCON Client \"%s\" connected!", a_Socket.GetIPString().c_str());
+	
+	// Create a new cConnection object, it will be deleted when the connection is closed
+	m_SocketThreads.AddClient(a_Socket, new cConnection(*this, a_Socket));
+}
+
+
+
+
+
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// cRCONServer::cConnection:
+
+cRCONServer::cConnection::cConnection(cRCONServer & a_RCONServer, cSocket & a_Socket) :
+	m_IsAuthenticated(false),
+	m_RCONServer(a_RCONServer),
+	m_Socket(a_Socket),
+	m_IPAddress(a_Socket.GetIPString())
+{
+}
+
+
+
+
+
+void cRCONServer::cConnection::DataReceived(const char * a_Data, int a_Size)
+{
+	// Append data to the buffer:
+	m_Buffer.append(a_Data, a_Size);
+	
+	// Process the packets in the buffer:
+	while (m_Buffer.size() >= 14)
+	{
+		int Length = IntFromBuffer(m_Buffer.data());
+		if (Length > 1500)
+		{
+			// Too long, drop the connection
+			LOGWARNING("Received an invalid RCON packet length (%d), dropping RCON connection to %s.",
+				Length, m_IPAddress.c_str()
+			);
+			m_RCONServer.m_SocketThreads.RemoveClient(this);
+			m_Socket.CloseSocket();
+			delete this;
+			return;
+		}
+		if (Length > (int)(m_Buffer.size() + 4))
+		{
+			// Incomplete packet yet, wait for more data to come
+			return;
+		}
+		
+		int RequestID  = IntFromBuffer(m_Buffer.data() + 4);
+		int PacketType = IntFromBuffer(m_Buffer.data() + 8);
+		if (!ProcessPacket(RequestID, PacketType, Length - 10, m_Buffer.data() + 12))
+		{
+			m_RCONServer.m_SocketThreads.RemoveClient(this);
+			m_Socket.CloseSocket();
+			delete this;
+			return;
+		}
+		m_Buffer.erase(0, Length + 4);
+	}  // while (m_Buffer.size() >= 14)
+}
+
+
+
+
+
+void cRCONServer::cConnection::GetOutgoingData(AString & a_Data)
+{
+	a_Data.assign(m_Outgoing);
+	m_Outgoing.clear();
+}
+
+
+
+
+
+void cRCONServer::cConnection::SocketClosed(void)
+{
+	m_RCONServer.m_SocketThreads.RemoveClient(this);
+	delete this;
+}
+
+
+
+
+
+bool cRCONServer::cConnection::ProcessPacket(int a_RequestID, int a_PacketType, int a_PayloadLength, const char * a_Payload)
+{
+	switch (a_PacketType)
+	{
+		case RCON_PACKET_LOGIN:
+		{
+			if (strncmp(a_Payload, m_RCONServer.m_Password.c_str(), a_PayloadLength) != 0)
+			{
+				LOGINFO("RCON: Invalid password from client %s, dropping connection.", m_IPAddress.c_str());
+				SendResponse(-1, RCON_PACKET_RESPONSE, 0, NULL);
+				return false;
+			}
+			m_IsAuthenticated = true;
+			
+			LOGD("RCON: Client at %s has successfully authenticated", m_IPAddress.c_str());
+			
+			// Send OK response:
+			SendResponse(a_RequestID, RCON_PACKET_RESPONSE, 0, NULL);
+			return true;
+		}
+		
+		case RCON_PACKET_COMMAND:
+		{
+			if (!m_IsAuthenticated)
+			{
+				char AuthNeeded[] = "You need to authenticate first!";
+				SendResponse(a_RequestID, RCON_PACKET_RESPONSE, sizeof(AuthNeeded), AuthNeeded);
+				return false;
+			}
+			
+			AString cmd(a_Payload, a_PayloadLength);
+			LOGD("RCON command from %s: \"%s\"", m_IPAddress.c_str(), cmd.c_str());
+			cRoot::Get()->ExecuteConsoleCommand(cmd, *(new cRCONCommandOutput(*this, a_RequestID)));
+			
+			// Send an empty response:
+			SendResponse(a_RequestID, RCON_PACKET_RESPONSE, 0, NULL);
+			return true;
+		}
+	}
+	
+	// Unknown packet type, drop the connection:
+	LOGWARNING("RCON: Client at %s has sent an unknown packet type %d, dropping connection.",
+		m_IPAddress.c_str(), a_PacketType
+	);
+	return false;
+}
+
+
+
+
+
+/// Reads 4 bytes from a_Buffer and returns the int they represent
+int cRCONServer::cConnection::IntFromBuffer(const char * a_Buffer)
+{
+	return ((unsigned char)a_Buffer[3] << 24) | ((unsigned char)a_Buffer[2] << 16) | ((unsigned char)a_Buffer[1] << 8) | (unsigned char)a_Buffer[0];
+}
+
+
+
+
+
+/// Puts 4 bytes representing the int into the buffer
+void cRCONServer::cConnection::IntToBuffer(int a_Value, char * a_Buffer)
+{
+	a_Buffer[0] = a_Value & 0xff;
+	a_Buffer[1] = (a_Value >> 8)  & 0xff;
+	a_Buffer[2] = (a_Value >> 16) & 0xff;
+	a_Buffer[3] = (a_Value >> 24) & 0xff;
+}
+
+
+
+
+
+/// Sends a RCON packet back to the client
+void cRCONServer::cConnection::SendResponse(int a_RequestID, int a_PacketType, int a_PayloadLength, const char * a_Payload)
+{
+	ASSERT((a_PayloadLength == 0) || (a_Payload != NULL));  // Either zero data to send, or a valid payload ptr
+	
+	char Buffer[4];
+	int Length = a_PayloadLength + 10;
+	IntToBuffer(Length, Buffer);
+	m_Outgoing.append(Buffer, 4);
+	IntToBuffer(a_RequestID, Buffer);
+	m_Outgoing.append(Buffer, 4);
+	IntToBuffer(a_PacketType, Buffer);
+	m_Outgoing.append(Buffer, 4);
+	if (a_PayloadLength > 0)
+	{
+		m_Outgoing.append(a_Payload, a_PayloadLength);
+	}
+	m_Outgoing.push_back(0);
+	m_Outgoing.push_back(0);
+	m_RCONServer.m_SocketThreads.NotifyWrite(this);
+}
+
+
+
+