Merge pull request #3 from DarkNeos/dev

Dev

DarkNeos/transform.go

+package darkneos
+
+import (
+	"encoding/binary"
+	"errors"
+	"fmt"
+	"unicode/utf16"
+
+	"github.com/sktt1ryze/ygopro-proxy/DarkNeos/ygopropb"
+	"google.golang.org/protobuf/proto"
+)
+
+const FILLING_TOKEN uint16 = 0xcccc
+const UTF16_BUFFER_MAX_LEN int = 20
+const PACKET_MIN_LEN int = 3
+
+const (
+	ProtobufToRawBuf = 1
+	RawBufToProtobuf = 2
+)
+
+const (
+	CtosProtoPlayerInfo = 16
+	CtosProtoJoinGame   = 18
+
+	StocChat = 25
+)
+
+type YgoPacket struct {
+	PacketLen uint16
+	Proto     uint8
+	Exdata    []byte
+}
+
+func packetToBuffer(pkt YgoPacket) []byte {
+	buf := make([]byte, 0)
+
+	// packet len
+	buf = append(buf, byte(pkt.PacketLen), byte(pkt.PacketLen>>8))
+	// proto
+	buf = append(buf, byte(pkt.Proto))
+	// exdata
+	for _, v := range pkt.Exdata {
+		buf = append(buf, v)
+	}
+
+	return buf
+}
+
+func bufferToPacket(p []byte) (YgoPacket, error) {
+	if len(p) < PACKET_MIN_LEN {
+		return YgoPacket{}, errors.New(fmt.Sprintf("Packet len too short, len=%d", len(p)))
+	}
+
+	// todo: impl Reader/Writer for buffer
+	packet_len := binary.LittleEndian.Uint16(p)
+	proto := p[2]
+	exdata := p[3 : packet_len+2]
+
+	return YgoPacket{
+		PacketLen: packet_len,
+		Proto:     proto,
+		Exdata:    exdata,
+	}, nil
+}
+
+func Transform(src []byte, tranformType int) ([]byte, error) {
+	if tranformType == ProtobufToRawBuf {
+		message := &ygopropb.YgoCtosMsg{}
+		err := proto.Unmarshal(src, message)
+		if err != nil {
+			return nil, err
+		}
+
+		var packet YgoPacket
+		switch message.Msg.(type) {
+		case *(ygopropb.YgoCtosMsg_CtosPlayerInfo):
+			packet = transformPlayerInfo(message.GetCtosPlayerInfo())
+		case *(ygopropb.YgoCtosMsg_CtosJoinGame):
+			packet = transformJoinGame(message.GetCtosJoinGame())
+		default:
+			return nil, errors.New("Unhandled YgoCtosMsg type")
+		}
+
+		return packetToBuffer(packet), nil
+
+	} else if tranformType == RawBufToProtobuf {
+		packet, err := bufferToPacket(src)
+		if err != nil {
+			return nil, err
+		}
+
+		var pb ygopropb.YgoStocMsg
+		switch packet.Proto {
+		case StocChat:
+			msg := transformChat(packet)
+			pb = ygopropb.YgoStocMsg{
+				Msg: &msg,
+			}
+		default:
+			return nil, errors.New("Unhandled YgoStocMsg type")
+		}
+
+		return proto.Marshal(&pb)
+	} else {
+		return nil, errors.New("Unknown tranformType")
+	}
+}
+
+// todo: use interface
+
+// +++++ Client To Server +++++
+
+// @Name: [20]uint16
+func transformPlayerInfo(pb *ygopropb.CtosPlayerInfo) YgoPacket {
+	buf := strToUtf16Buffer(pb.Name)
+	exdata := uint16BufToByteBuf(buf)
+
+	return YgoPacket{
+		PacketLen: uint16(len(exdata)) + 1,
+		Proto:     CtosProtoPlayerInfo,
+		Exdata:    exdata,
+	}
+}
+
+// @Version: uint16
+// @Gameid: uint32
+// @Passwd: [20]uint16
+func transformJoinGame(pb *ygopropb.CtosJoinGame) YgoPacket {
+	exdata := make([]byte, 0)
+
+	version := uint16(pb.Version)
+	exdata = append(exdata, byte(version), byte(version>>8), 0, 0)
+
+	exdata = append(exdata, byte(pb.Gameid), byte(pb.Gameid>>8), byte(pb.Gameid>>16), byte(pb.Gameid>>24))
+
+	for _, v := range uint16BufToByteBuf(strToUtf16Buffer(pb.Passwd)) {
+		exdata = append(exdata, v)
+	}
+
+	return YgoPacket{
+		PacketLen: uint16(len(exdata)) + 1,
+		Proto:     CtosProtoJoinGame,
+		Exdata:    exdata,
+	}
+}
+
+// +++++ Server To Client +++++
+
+// @player: uint16
+// @message: []uint16
+func transformChat(pkt YgoPacket) ygopropb.YgoStocMsg_StocChat {
+	player := int32(binary.LittleEndian.Uint16(pkt.Exdata))
+	message := utf16BufferToStr(pkt.Exdata[2:])
+
+	return ygopropb.YgoStocMsg_StocChat{
+		StocChat: &ygopropb.StocChat{
+			Player: player,
+			Msg:    message,
+		},
+	}
+}
+
+// +++++ Util Functions +++++
+
+func strToUtf16Buffer(s string) []uint16 {
+	b := make([]uint16, UTF16_BUFFER_MAX_LEN, UTF16_BUFFER_MAX_LEN)
+	for i := range b {
+		b[i] = FILLING_TOKEN
+	}
+
+	s_utf16 := utf16.Encode([]rune(s))
+
+	// todo: optimize
+	for i, v := range s_utf16 {
+		if i < UTF16_BUFFER_MAX_LEN {
+			b[i] = v
+
+			if i == len(s_utf16)-1 && i < len(b)-1 {
+				b[i+1] = 0
+			}
+		} else {
+			break
+		}
+	}
+
+	return b
+}
+
+func utf16BufferToStr(p []byte) string {
+	v := chunkBytesToUint16s(p)
+
+	return string(utf16.Decode(v))
+}
+
+func uint16BufToByteBuf(u16_b []uint16) []byte {
+	b := make([]byte, 0, len(u16_b)*2)
+
+	for _, v := range u16_b {
+		// little endian
+		b = append(b, byte(v), byte(v>>8))
+	}
+
+	return b
+}
+
+func chunkBytesToUint16s(items []byte) []uint16 {
+	const chunkSize = 2
+	var chunks []uint16
+
+	for chunkSize < len(items) {
+		items, chunks = items[chunkSize:], append(chunks, binary.LittleEndian.Uint16(items))
+	}
+
+	return chunks
+}

DarkNeos/ygoprobuffer/ctos.go

+package ygoprobuffer
+
+const PLAYER_NAME_MAX_LEN int = 20
+
+type CtosPlayerInfo struct {
+	Name [PLAYER_NAME_MAX_LEN]uint16
+}

go.mod

@@ -2,4 +2,8 @@ module github.com/sktt1ryze/ygopro-proxy
 
 go 1.17
 
-require github.com/gorilla/websocket v1.5.0 // indirect
+require (
+	github.com/golang/protobuf v1.5.2 // indirect
+	github.com/gorilla/websocket v1.5.0 // indirect
+	google.golang.org/protobuf v1.28.1 // indirect
+)

go.sum

+github.com/golang/protobuf v1.5.0/go.mod h1:FsONVRAS9T7sI+LIUmWTfcYkHO4aIWwzhcaSAoJOfIk=
+github.com/golang/protobuf v1.5.2 h1:ROPKBNFfQgOUMifHyP+KYbvpjbdoFNs+aK7DXlji0Tw=
+github.com/golang/protobuf v1.5.2/go.mod h1:XVQd3VNwM+JqD3oG2Ue2ip4fOMUkwXdXDdiuN0vRsmY=
+github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/gorilla/websocket v1.5.0 h1:PPwGk2jz7EePpoHN/+ClbZu8SPxiqlu12wZP/3sWmnc=
 github.com/gorilla/websocket v1.5.0/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
+golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
+google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
+google.golang.org/protobuf v1.28.1 h1:d0NfwRgPtno5B1Wa6L2DAG+KivqkdutMf1UhdNx175w=
+google.golang.org/protobuf v1.28.1/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I=

proxy.go

@@ -9,6 +9,7 @@ import (
 	"sync"
 
 	"github.com/gorilla/websocket"
+	darkneos "github.com/sktt1ryze/ygopro-proxy/DarkNeos"
 )
 
 const TARGET_PORT = ":8000"
@@ -50,10 +51,12 @@ func ygoEndpoint(w http.ResponseWriter, r *http.Request) {
 }
 
 func wsProxy(ws *websocket.Conn, tcp *net.Conn, wg *sync.WaitGroup) {
+	writer := bufio.NewWriter(*tcp)
+
 	for {
-		messageType, buf, err := ws.ReadMessage()
+		messageType, buffer, err := ws.ReadMessage()
 		if err != nil {
-			log.Fatal("websocket read message error: ", err)
+			log.Println("websocket read message error: ", err)
 			break
 		}
 
@@ -62,10 +65,11 @@ func wsProxy(ws *websocket.Conn, tcp *net.Conn, wg *sync.WaitGroup) {
 			break
 		}
 
-		log.Println("websocket to tcp: " + string(buf))
-
-		writer := bufio.NewWriter(*tcp)
-		buffer := make([]byte, BUFFER_SIZE)
+		buffer, err = darkneos.Transform(buffer, darkneos.ProtobufToRawBuf)
+		if err != nil {
+			log.Fatal(err)
+			break
+		}
 
 		_, err = writer.Write(buffer)
 		if err != nil {
@@ -78,23 +82,27 @@ func wsProxy(ws *websocket.Conn, tcp *net.Conn, wg *sync.WaitGroup) {
 }
 
 func tcpProxy(tcp *net.Conn, ws *websocket.Conn, wg *sync.WaitGroup) {
-	for {
 	reader := bufio.NewReader(*tcp)
 	buffer := make([]byte, BUFFER_SIZE)
 
+	for {
 		_, err := reader.Read(buffer)
 		if err != nil {
 			if err == io.EOF {
 				continue
 			}
 
-			log.Fatal("tcp read message error: ", err)
+			log.Println("tcp read message error: ", err)
 			break
 		}
 
-		log.Println("tcp to websocket: " + string(buffer))
+		buffer, err = darkneos.Transform(buffer, darkneos.RawBufToProtobuf)
+		if err != nil {
+			log.Fatal(err)
+			break
+		}
 
-		err = ws.WriteMessage(websocket.TextMessage, buffer) // temporary TextMessage, should be BinaryMessage in ygopro
+		err = ws.WriteMessage(websocket.BinaryMessage, buffer)
 		if err != nil {
 			log.Fatal("tcp send message error: ", err)
 			break

ygopro.proto

@@ -4,16 +4,19 @@ package ygopro;
 option go_package = "DarkNeos/ygopropb";
 
 message YgoCtosMsg {
-  int32 proto = 1;
   oneof msg {
-    CtosPlayerInfo ctos_player_info = 2;
-    CtosJoinGame ctos_join_game = 3;
-    CtosUpdateDeck ctos_update_deck = 4;
+    CtosPlayerInfo ctos_player_info = 1;
+    CtosJoinGame ctos_join_game = 2;
+    CtosUpdateDeck ctos_update_deck = 3;
+  }  
+}
 
-    StocJoinGame stoc_join_game = 101;
-    StocChat stoc_chat = 102;
-    StocHsPlayerEnter stoc_hs_player_enter = 103;
-    StocTypeChange stoc_type_change = 104;
+message YgoStocMsg {
+  oneof msg {
+    StocJoinGame stoc_join_game = 1;
+    StocChat stoc_chat = 2;
+    StocHsPlayerEnter stoc_hs_player_enter = 3;
+    StocTypeChange stoc_type_change = 4;
   }
 }