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cuberite-2a/src/RCONServer.cpp

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// RCONServer.cpp
// Implements the cRCONServer class representing the RCON server
#include "Globals.h"
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#include "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,
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// Server -> Client:
RCON_PACKET_RESPONSE = 2,
} ;
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////////////////////////////////////////////////////////////////////////////////
// cRCONListenCallbacks:
class cRCONListenCallbacks:
public cNetwork::cListenCallbacks
{
public:
cRCONListenCallbacks(cRCONServer & a_RCONServer, UInt16 a_Port):
m_RCONServer(a_RCONServer),
m_Port(a_Port)
{
}
protected:
/** The RCON server instance that we're attached to. */
cRCONServer & m_RCONServer;
/** The port for which this instance is responsible. */
UInt16 m_Port;
// cNetwork::cListenCallbacks overrides:
virtual cTCPLink::cCallbacksPtr OnIncomingConnection(const AString & a_RemoteIPAddress, UInt16 a_RemotePort) override
{
LOG("RCON Client \"%s\" connected!", a_RemoteIPAddress.c_str());
return std::make_shared<cRCONServer::cConnection>(m_RCONServer, a_RemoteIPAddress);
}
virtual void OnAccepted(cTCPLink & a_Link) override {}
virtual void OnError(int a_ErrorCode, const AString & a_ErrorMsg) override
{
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LOGWARNING("RCON server error on port %d: %d (%s)", m_Port, a_ErrorCode, a_ErrorMsg.c_str());
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}
};
////////////////////////////////////////////////////////////////////////////////
// cRCONCommandOutput:
class cRCONCommandOutput :
public cCommandOutputCallback
{
public:
cRCONCommandOutput(cRCONServer::cConnection & a_Connection, UInt32 a_RequestID) :
m_Connection(a_Connection),
m_RequestID(a_RequestID)
{
}
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// cCommandOutputCallback overrides:
virtual void Out(const AString & a_Text) override
{
m_Buffer.append(a_Text);
}
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virtual void Finished(void) override
{
m_Connection.SendResponse(m_RequestID, RCON_PACKET_RESPONSE, static_cast<UInt32>(m_Buffer.size()), m_Buffer.c_str());
delete this;
}
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protected:
cRCONServer::cConnection & m_Connection;
UInt32 m_RequestID;
AString m_Buffer;
} ;
////////////////////////////////////////////////////////////////////////////////
// cRCONServer:
cRCONServer::cRCONServer(cServer & a_Server) :
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m_Server(a_Server)
{
}
cRCONServer::~cRCONServer()
{
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for (auto srv: m_ListenServers)
{
srv->Close();
}
}
void cRCONServer::Initialize(cSettingsRepositoryInterface & a_Settings)
{
if (!a_Settings.GetValueSetB("RCON", "Enabled", false))
{
return;
}
// Read the password, don't allow an empty one:
m_Password = a_Settings.GetValueSet("RCON", "Password", "");
if (m_Password.empty())
{
LOGWARNING("RCON is requested, but the password is not set. RCON is now disabled.");
return;
}
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// Read the listening ports for RCON from config:
AStringVector Ports = ReadUpgradeIniPorts(a_Settings, "RCON", "Ports", "PortsIPv4", "PortsIPv6", "25575");
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// Start listening on each specified port:
for (auto port: Ports)
{
UInt16 PortNum;
if (!StringToInteger(port, PortNum))
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{
LOGINFO("Invalid RCON port value: \"%s\". Ignoring.", port.c_str());
continue;
}
auto Handle = cNetwork::Listen(PortNum, std::make_shared<cRCONListenCallbacks>(*this, PortNum));
if (Handle->IsListening())
{
m_ListenServers.push_back(Handle);
}
}
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if (m_ListenServers.empty())
{
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LOGWARNING("RCON is enabled but no valid ports were found. RCON is not accessible.");
}
}
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////////////////////////////////////////////////////////////////////////////////
// cRCONServer::cConnection:
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cRCONServer::cConnection::cConnection(cRCONServer & a_RCONServer, const AString & a_IPAddress) :
m_IsAuthenticated(false),
m_RCONServer(a_RCONServer),
m_IPAddress(a_IPAddress)
{
}
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void cRCONServer::cConnection::OnLinkCreated(cTCPLinkPtr a_Link)
{
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m_Link = a_Link;
}
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void cRCONServer::cConnection::OnReceivedData(const char * a_Data, size_t a_Size)
{
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ASSERT(m_Link != nullptr);
// Append data to the buffer:
m_Buffer.append(a_Data, a_Size);
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// Process the packets in the buffer:
while (m_Buffer.size() >= 14)
{
UInt32 Length = UIntFromBuffer(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()
);
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m_Link->Close();
m_Link.reset();
return;
}
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if (Length > static_cast<UInt32>(m_Buffer.size() + 4))
{
// Incomplete packet yet, wait for more data to come
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return;
}
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UInt32 RequestID = UIntFromBuffer(m_Buffer.data() + 4);
UInt32 PacketType = UIntFromBuffer(m_Buffer.data() + 8);
if (!ProcessPacket(RequestID, PacketType, Length - 10, m_Buffer.data() + 12))
{
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m_Link->Close();
m_Link.reset();
return;
}
m_Buffer.erase(0, Length + 4);
} // while (m_Buffer.size() >= 14)
}
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void cRCONServer::cConnection::OnRemoteClosed(void)
{
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m_Link.reset();
}
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void cRCONServer::cConnection::OnError(int a_ErrorCode, const AString & a_ErrorMsg)
{
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LOGD("Error in RCON connection %s: %d (%s)", m_IPAddress.c_str(), a_ErrorCode, a_ErrorMsg.c_str());
m_Link.reset();
}
bool cRCONServer::cConnection::ProcessPacket(UInt32 a_RequestID, UInt32 a_PacketType, UInt32 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(0xffffffffU, RCON_PACKET_RESPONSE, 0, nullptr);
return false;
}
m_IsAuthenticated = true;
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LOGD("RCON: Client at %s has successfully authenticated", m_IPAddress.c_str());
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// Send OK response:
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SendResponse(a_RequestID, RCON_PACKET_RESPONSE, 0, nullptr);
return true;
}
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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;
}
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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)));
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// Send an empty response:
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SendResponse(a_RequestID, RCON_PACKET_RESPONSE, 0, nullptr);
return true;
}
}
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// 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;
}
UInt32 cRCONServer::cConnection::UIntFromBuffer(const char * a_Buffer)
{
const Byte * Buffer = reinterpret_cast<const Byte *>(a_Buffer);
return static_cast<UInt32>((Buffer[3] << 24) | (Buffer[2] << 16) | (Buffer[1] << 8) | Buffer[0]);
}
void cRCONServer::cConnection::UIntToBuffer(UInt32 a_Value, char * a_Buffer)
{
a_Buffer[0] = static_cast<char>(a_Value & 0xff);
a_Buffer[1] = static_cast<char>((a_Value >> 8) & 0xff);
a_Buffer[2] = static_cast<char>((a_Value >> 16) & 0xff);
a_Buffer[3] = static_cast<char>((a_Value >> 24) & 0xff);
}
void cRCONServer::cConnection::SendResponse(UInt32 a_RequestID, UInt32 a_PacketType, UInt32 a_PayloadLength, const char * a_Payload)
{
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ASSERT((a_PayloadLength == 0) || (a_Payload != nullptr)); // Either zero data to send, or a valid payload ptr
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ASSERT(m_Link != nullptr);
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char Buffer[12];
UInt32 Length = a_PayloadLength + 10;
UIntToBuffer(Length, Buffer);
UIntToBuffer(a_RequestID, Buffer + 4);
UIntToBuffer(a_PacketType, Buffer + 8);
m_Link->Send(Buffer, 12);
if (a_PayloadLength > 0)
{
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m_Link->Send(a_Payload, a_PayloadLength);
}
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m_Link->Send("\0", 2); // Send two zero chars as the padding
}