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-rw-r--r--source/Protocol/Protocol.h21
-rw-r--r--source/Protocol/Protocol125.h4
-rw-r--r--source/Protocol/Protocol17x.cpp216
-rw-r--r--source/Protocol/Protocol17x.h75
-rw-r--r--source/Protocol/ProtocolRecognizer.cpp120
-rw-r--r--source/Protocol/ProtocolRecognizer.h22
6 files changed, 447 insertions, 11 deletions
diff --git a/source/Protocol/Protocol.h b/source/Protocol/Protocol.h
index 5071f5961..466cf874b 100644
--- a/source/Protocol/Protocol.h
+++ b/source/Protocol/Protocol.h
@@ -186,6 +186,27 @@ protected:
WriteInt(a_Vector.y);
WriteInt(a_Vector.z);
}
+
+ void WriteVarInt(UInt32 a_Value)
+ {
+ // A 32-bit integer can be encoded by at most 5 bytes:
+ unsigned char b[5];
+ int idx = 0;
+ do
+ {
+ b[idx] = (a_Value & 0x7f) | ((a_Value > 0x7f) ? 0x80 : 0x00);
+ a_Value = a_Value >> 7;
+ idx++;
+ } while (a_Value > 0);
+
+ SendData((const char *)b, idx);
+ }
+
+ void WriteVarUTF8String(const AString & a_String)
+ {
+ WriteVarInt(a_String.size());
+ SendData(a_String.data(), a_String.size());
+ }
} ;
diff --git a/source/Protocol/Protocol125.h b/source/Protocol/Protocol125.h
index ae198780c..da3f81444 100644
--- a/source/Protocol/Protocol125.h
+++ b/source/Protocol/Protocol125.h
@@ -92,9 +92,9 @@ protected:
PARSE_INCOMPLETE = -3,
} ;
- cByteBuffer m_ReceivedData; //< Buffer for the received data
+ cByteBuffer m_ReceivedData; ///< Buffer for the received data
- AString m_Username; //< Stored in ParseHandshake(), compared to Login username
+ AString m_Username; ///< Stored in ParseHandshake(), compared to Login username
virtual void SendData(const char * a_Data, int a_Size) override;
diff --git a/source/Protocol/Protocol17x.cpp b/source/Protocol/Protocol17x.cpp
new file mode 100644
index 000000000..b93a95e12
--- /dev/null
+++ b/source/Protocol/Protocol17x.cpp
@@ -0,0 +1,216 @@
+
+// Protocol17x.cpp
+
+/*
+Implements the 1.7.x protocol classes:
+ - cProtocol172
+ - release 1.7.2 protocol (#4)
+(others may be added later in the future for the 1.7 release series)
+*/
+
+#include "Globals.h"
+#include "Protocol17x.h"
+#include "../ClientHandle.h"
+#include "../Root.h"
+#include "../Server.h"
+
+
+
+
+
+cProtocol172::cProtocol172(cClientHandle * a_Client, const AString & a_ServerAddress, UInt16 a_ServerPort, UInt32 a_State) :
+ super(a_Client),
+ m_ServerAddress(a_ServerAddress),
+ m_ServerPort(a_ServerPort),
+ m_State(a_State),
+ m_ReceivedData(32 KiB),
+ m_IsEncrypted(false)
+{
+}
+
+
+
+
+
+void cProtocol172::DataReceived(const char * a_Data, int a_Size)
+{
+ if (m_IsEncrypted)
+ {
+ byte Decrypted[512];
+ while (a_Size > 0)
+ {
+ int NumBytes = (a_Size > sizeof(Decrypted)) ? sizeof(Decrypted) : a_Size;
+ m_Decryptor.ProcessData(Decrypted, (byte *)a_Data, NumBytes);
+ AddReceivedData((const char *)Decrypted, NumBytes);
+ a_Size -= NumBytes;
+ a_Data += NumBytes;
+ }
+ }
+ else
+ {
+ AddReceivedData(a_Data, a_Size);
+ }
+}
+
+
+
+
+void cProtocol172::AddReceivedData(const char * a_Data, int a_Size)
+{
+ if (!m_ReceivedData.Write(a_Data, a_Size))
+ {
+ // Too much data in the incoming queue, report to caller:
+ m_Client->PacketBufferFull();
+ return;
+ }
+
+ // Handle all complete packets:
+ while (true)
+ {
+ UInt32 PacketLen;
+ if (!m_ReceivedData.ReadVarInt(PacketLen))
+ {
+ // Not enough data
+ return;
+ }
+ if (!m_ReceivedData.CanReadBytes(PacketLen))
+ {
+ // The full packet hasn't been received yet
+ return;
+ }
+ UInt32 PacketType;
+ UInt32 NumBytesRead = m_ReceivedData.GetReadableSpace();
+ if (!m_ReceivedData.ReadVarInt(PacketType))
+ {
+ // Not enough data
+ return;
+ }
+ NumBytesRead -= m_ReceivedData.GetReadableSpace();
+ HandlePacket(PacketType, PacketLen - NumBytesRead);
+ } // while (true)
+}
+
+
+
+
+void cProtocol172::HandlePacket(UInt32 a_PacketType, UInt32 a_RemainingBytes)
+{
+ switch (m_State)
+ {
+ case 1:
+ {
+ // Status
+ switch (a_PacketType)
+ {
+ case 0x00: HandlePacketStatusRequest(a_RemainingBytes); return;
+ }
+ break;
+ }
+
+ case 2:
+ {
+ // Login
+ break;
+ }
+
+ case 3:
+ {
+ // Game
+ break;
+ }
+ } // switch (m_State)
+
+ // Unknown packet type, report to the client:
+ m_Client->PacketUnknown(a_PacketType);
+ m_ReceivedData.SkipRead(a_RemainingBytes);
+ m_ReceivedData.CommitRead();
+}
+
+
+
+
+
+void cProtocol172::HandlePacketStatusRequest(UInt32 a_RemainingBytes)
+{
+ // No more bytes in this packet
+ ASSERT(a_RemainingBytes == 0);
+ m_ReceivedData.CommitRead();
+
+ // Send the response:
+ AString Response = "{\"version\":{\"name\":\"1.7.2\",\"protocol\":4},\"players\":{";
+ AppendPrintf(Response, "\"max\":%u,\"online\":%u,\"sample\":[]},",
+ cRoot::Get()->GetServer()->GetMaxPlayers(),
+ cRoot::Get()->GetServer()->GetNumPlayers()
+ );
+ AppendPrintf(Response, "\"description\":{\"text\":\"%s\"}",
+ cRoot::Get()->GetServer()->GetDescription().c_str()
+ );
+ Response.append("}");
+
+ cByteBuffer Packet(Response.size() + 10);
+ Packet.WriteVarInt(0x00); // Response packet
+ Packet.WriteVarUTF8String(Response);
+ WritePacket(Packet);
+}
+
+
+
+
+
+void cProtocol172::WritePacket(cByteBuffer & a_Packet)
+{
+ cCSLock Lock(m_CSPacket);
+ AString Pkt;
+ a_Packet.ReadAll(Pkt);
+ WriteVarInt(Pkt.size());
+ SendData(Pkt.data(), Pkt.size());
+ Flush();
+}
+
+
+
+
+
+void cProtocol172::SendData(const char * a_Data, int a_Size)
+{
+ m_DataToSend.append(a_Data, a_Size);
+}
+
+
+
+
+
+void cProtocol172::Flush(void)
+{
+ ASSERT(m_CSPacket.IsLockedByCurrentThread()); // Did all packets lock the CS properly?
+
+ if (m_DataToSend.empty())
+ {
+ LOGD("Flushing empty");
+ return;
+ }
+ const char * a_Data = m_DataToSend.data();
+ int a_Size = m_DataToSend.size();
+ if (m_IsEncrypted)
+ {
+ byte Encrypted[8192]; // Larger buffer, we may be sending lots of data (chunks)
+ while (a_Size > 0)
+ {
+ int NumBytes = (a_Size > sizeof(Encrypted)) ? sizeof(Encrypted) : a_Size;
+ m_Encryptor.ProcessData(Encrypted, (byte *)a_Data, NumBytes);
+ m_Client->SendData((const char *)Encrypted, NumBytes);
+ a_Size -= NumBytes;
+ a_Data += NumBytes;
+ }
+ }
+ else
+ {
+ m_Client->SendData(a_Data, a_Size);
+ }
+ m_DataToSend.clear();
+}
+
+
+
+
+
diff --git a/source/Protocol/Protocol17x.h b/source/Protocol/Protocol17x.h
new file mode 100644
index 000000000..cea39f073
--- /dev/null
+++ b/source/Protocol/Protocol17x.h
@@ -0,0 +1,75 @@
+
+// Protocol17x.h
+
+/*
+Declares the 1.7.x protocol classes:
+ - cProtocol172
+ - release 1.7.2 protocol (#4)
+(others may be added later in the future for the 1.7 release series)
+*/
+
+
+
+
+
+#pragma once
+
+#include "Protocol16x.h"
+
+
+
+
+
+class cProtocol172 :
+ public cProtocol162 // TODO
+{
+ typedef cProtocol162 super; // TODO
+
+public:
+
+ cProtocol172(cClientHandle * a_Client, const AString & a_ServerAddress, UInt16 a_ServerPort, UInt32 a_State);
+
+ /// Called when client sends some data:
+ virtual void DataReceived(const char * a_Data, int a_Size) override;
+
+protected:
+
+ AString m_ServerAddress;
+
+ UInt16 m_ServerPort;
+
+ /// State of the protocol. 1 = status, 2 = login
+ UInt32 m_State;
+
+ /// Buffer for the received data
+ cByteBuffer m_ReceivedData;
+
+ bool m_IsEncrypted;
+ CryptoPP::CFB_Mode<CryptoPP::AES>::Decryption m_Decryptor;
+ CryptoPP::CFB_Mode<CryptoPP::AES>::Encryption m_Encryptor;
+
+ /// (Unencrypted) data to be sent to the client. Written by SendData, cleared by Flush()
+ AString m_DataToSend;
+
+
+ /// Adds the received (unencrypted) data to m_ReceivedData, parses complete packets
+ void AddReceivedData(const char * a_Data, int a_Size);
+
+ /// Reads and handles the packet. The packet length and type have already been read.
+ void HandlePacket(UInt32 a_PacketType, UInt32 a_RemainingBytes);
+
+ void HandlePacketStatusRequest(UInt32 a_RemainingBytes);
+
+ /// Writes an entire packet into the output stream. a_Packet is expected to start with the packet type; data length is prepended here.
+ void WritePacket(cByteBuffer & a_Packet);
+
+ /// Adds unencrypted data to the outgoing data buffer
+ virtual void SendData(const char * a_Data, int a_Size) override;
+
+ /// Flushes m_DataToSend through the optional encryption into the outgoing socket data
+ virtual void Flush(void) override;
+} ;
+
+
+
+
diff --git a/source/Protocol/ProtocolRecognizer.cpp b/source/Protocol/ProtocolRecognizer.cpp
index ceada1944..18e9186b2 100644
--- a/source/Protocol/ProtocolRecognizer.cpp
+++ b/source/Protocol/ProtocolRecognizer.cpp
@@ -12,6 +12,7 @@
#include "Protocol14x.h"
#include "Protocol15x.h"
#include "Protocol16x.h"
+#include "Protocol17x.h"
#include "../ClientHandle.h"
#include "../Root.h"
#include "../Server.h"
@@ -667,11 +668,65 @@ bool cProtocolRecognizer::TryRecognizeProtocol(void)
}
switch (PacketType)
{
- case 0x02: break; // Handshake, continue recognizing
- case 0xfe: HandleServerPing(); return false;
- default: return false;
+ case 0x02: return TryRecognizeLengthlessProtocol(); // Handshake, continue recognizing
+ case 0xfe:
+ {
+ // This may be either a packet length or the length-less Ping packet
+ Byte NextByte;
+ if (!m_Buffer.ReadByte(NextByte))
+ {
+ // Not enough data for either protocol
+ // This could actually happen with the 1.2 / 1.3 client, but their support is fading out anyway
+ return false;
+ }
+ if (NextByte != 0x01)
+ {
+ // This is definitely NOT a length-less Ping packet, handle as lengthed protocol:
+ break;
+ }
+ if (!m_Buffer.ReadByte(NextByte))
+ {
+ // There is no more data. Although this *could* mean TCP fragmentation, it is highly unlikely
+ // and rather this is a 1.4 client sending a regular Ping packet (without the following Plugin message)
+ SendLengthlessServerPing();
+ return false;
+ }
+ if (NextByte == 0xfa)
+ {
+ // Definitely a length-less Ping followed by a Plugin message
+ SendLengthlessServerPing();
+ return false;
+ }
+ // Definitely a lengthed Initial handshake, handle below:
+ break;
+ }
+ } // switch (PacketType)
+
+ // This must be a lengthed protocol, try if it has the entire initial handshake packet:
+ m_Buffer.ResetRead();
+ UInt32 PacketLen;
+ UInt32 ReadSoFar = m_Buffer.GetReadableSpace();
+ if (!m_Buffer.ReadVarInt(PacketLen))
+ {
+ // Not enough bytes for the packet length, keep waiting
+ return false;
}
-
+ ReadSoFar -= m_Buffer.GetReadableSpace();
+ if (!m_Buffer.CanReadBytes(PacketLen))
+ {
+ // Not enough bytes for the packet, keep waiting
+ return false;
+ }
+ return TryRecognizeLengthedProtocol(PacketLen - ReadSoFar);
+}
+
+
+
+
+
+bool cProtocolRecognizer::TryRecognizeLengthlessProtocol(void)
+{
+ // The comm started with 0x02, which is a Handshake packet in the length-less protocol family
// 1.3.2 starts with 0x02 0x39 <name-length-short>
// 1.2.5 starts with 0x02 <name-length-short> and name is expected to less than 0x3900 long :)
char ch;
@@ -724,7 +779,56 @@ bool cProtocolRecognizer::TryRecognizeProtocol(void)
-void cProtocolRecognizer::HandleServerPing(void)
+bool cProtocolRecognizer::TryRecognizeLengthedProtocol(UInt32 a_PacketLengthRemaining)
+{
+ UInt32 PacketType;
+ UInt32 NumBytesRead = m_Buffer.GetReadableSpace();
+ if (!m_Buffer.ReadVarInt(PacketType))
+ {
+ return false;
+ }
+ if (PacketType != 0x00)
+ {
+ // Not an initial handshake packet, we don't know how to talk to them
+ LOGINFO("Client \"%s\" uses an unsupported protocol (lengthed, initial packet %u)",
+ m_Client->GetIPString().c_str(), PacketType
+ );
+ m_Client->Kick("Unsupported protocol version");
+ return false;
+ }
+ UInt32 ProtocolVersion;
+ if (!m_Buffer.ReadVarInt(ProtocolVersion))
+ {
+ return false;
+ }
+ NumBytesRead -= m_Buffer.GetReadableSpace();
+ switch (ProtocolVersion)
+ {
+ case PROTO_VERSION_1_7_2:
+ {
+ AString ServerAddress;
+ short ServerPort;
+ UInt32 NextState;
+ m_Buffer.ReadVarUTF8String(ServerAddress);
+ m_Buffer.ReadBEShort(ServerPort);
+ m_Buffer.ReadVarInt(NextState);
+ m_Buffer.CommitRead();
+ m_Protocol = new cProtocol172(m_Client, ServerAddress, ServerPort, NextState);
+ return true;
+ }
+ }
+ LOGINFO("Client \"%s\" uses an unsupported protocol (lengthed, version %u)",
+ m_Client->GetIPString().c_str(), ProtocolVersion
+ );
+ m_Client->Kick("Unsupported protocol version");
+ return false;
+}
+
+
+
+
+
+void cProtocolRecognizer::SendLengthlessServerPing(void)
{
AString Reply;
switch (cRoot::Get()->GetPrimaryServerVersion())
@@ -757,10 +861,12 @@ void cProtocolRecognizer::HandleServerPing(void)
// http://wiki.vg/wiki/index.php?title=Protocol&oldid=3101#Server_List_Ping_.280xFE.29
// _X 2012_10_31: I know that this needn't eat the byte, since it still may be in transit.
// Who cares? We're disconnecting anyway.
- if (m_Buffer.CanReadBytes(1))
+ m_Buffer.ResetRead();
+ if (m_Buffer.CanReadBytes(2))
{
byte val;
- m_Buffer.ReadByte(val);
+ m_Buffer.ReadByte(val); // Packet type - Serverlist ping
+ m_Buffer.ReadByte(val); // 0x01 magic value
ASSERT(val == 0x01);
}
diff --git a/source/Protocol/ProtocolRecognizer.h b/source/Protocol/ProtocolRecognizer.h
index c53288230..4c473a269 100644
--- a/source/Protocol/ProtocolRecognizer.h
+++ b/source/Protocol/ProtocolRecognizer.h
@@ -47,6 +47,9 @@ public:
PROTO_VERSION_NEXT,
PROTO_VERSION_LATEST = PROTO_VERSION_NEXT - 1, ///< Automatically assigned to the last protocol version, this serves as the default for PrimaryServerVersion
+
+ // These will be kept "under" the next / latest, because the next and latest are only needed for previous protocols
+ PROTO_VERSION_1_7_2 = 4,
} ;
cProtocolRecognizer(cClientHandle * a_Client);
@@ -124,8 +127,23 @@ protected:
/// Tries to recognize protocol based on m_Buffer contents; returns true if recognized
bool TryRecognizeProtocol(void);
- /// Called when the recognizer gets a server ping packet; responds with server stats and destroys the client
- void HandleServerPing(void);
+ /** Tries to recognize a protocol in the length-less family, based on m_Buffer; returns true if recognized.
+ Handles protocols before release 1.7, that didn't include packet lengths, and started with a 0x02 handshake packet
+ Note that length-less server ping is handled directly in TryRecognizeProtocol(), this function is called only
+ when the 0x02 Handshake packet has been received
+ */
+ bool TryRecognizeLengthlessProtocol(void);
+
+ /** Tries to recognize a protocol in the leghted family (1.7+), based on m_Buffer; returns true if recognized.
+ The packet length and type have already been read, type is 0
+ The number of bytes remaining in the packet is passed as a_PacketLengthRemaining
+ **/
+ bool TryRecognizeLengthedProtocol(UInt32 a_PacketLengthRemaining);
+
+ /** Called when the recognizer gets a length-less protocol's server ping packet
+ Responds with server stats and destroys the client.
+ */
+ void SendLengthlessServerPing(void);
} ;
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-01 10:11:38 +0100