add support for newer minecraft versions (tested in 1.18.2)

core/common.go

@@ -8,6 +8,7 @@ import (
 )
 
 const VERSION_1_8_9 = 47
+const VERSION_1_18_2 = 758
 
 var onlineCount atomic.Int32
 
@@ -51,11 +52,11 @@ type statusResponse struct {
 }
 
 // write ping response packet
-func sendResponse(w io.Writer) error {
+func sendResponse(w io.Writer, protocol int) error {
 	resp, err := json.Marshal(statusResponse{
 		Version: statusVersion{
-			Name:     "1.8.9",
-			Protocol: VERSION_1_8_9,
+			Name:     "gomcproxy",
+			Protocol: protocol,
 		},
 		Players: statusPlayers{
 			Max:    cfg.MaxPlayer,

core/core.go

@@ -59,14 +59,14 @@ func handler(conn net.Conn) {
 	switch nextState {
 	case 1: // status
 
-		err := handlePing(reader, conn)
+		err := handlePing(reader, conn, int(protocol))
 		if err != nil {
 			log.Println("handle ping error:", err)
 		}
 
 	case 2: // login
 
-		if protocol != VERSION_1_8_9 {
+		if protocol < VERSION_1_8_9 {
 			err := sendDisconnect(conn, "unsupported client version")
 			if err != nil {
 				log.Println("disconnect error:", err)
@@ -83,7 +83,7 @@ func handler(conn net.Conn) {
 			return
 		}
 
-		err := handleForward(reader, conn, strings.HasSuffix(string(address), "\x00FML\x00"))
+		err := handleForward(reader, conn, strings.HasSuffix(string(address), "\x00FML\x00"), int(protocol))
 		if err != nil {
 			log.Println("handle forward error:", err)
 		}

core/forward.go

@@ -7,7 +7,7 @@ import (
 	"sync"
 )
 
-func handleForward(reader io.Reader, writer io.Writer, fml bool) error {
+func handleForward(reader io.Reader, writer io.Writer, fml bool, protocol int) error {
 	onlineCount.Add(1)
 	defer onlineCount.Add(-1)
 
@@ -59,7 +59,7 @@ func handleForward(reader io.Reader, writer io.Writer, fml bool) error {
 	}
 
 	pktHandshake, err := Pack(
-		VarInt(VERSION_1_8_9),
+		VarInt(protocol),
 		String(rewriteHost),
 		UShort(cfg.RewirtePort),
 		VarInt(2), // next state login

core/ping.go

@@ -7,7 +7,7 @@ import (
 	"time"
 )
 
-func handlePing(reader io.Reader, writer io.Writer) error {
+func handlePing(reader io.Reader, writer io.Writer, protocol int) error {
 
 	// request
 	pkt, err := ReadPacket(reader)
@@ -19,7 +19,7 @@ func handlePing(reader io.Reader, writer io.Writer) error {
 	}
 
 	// response
-	err = sendResponse(writer)
+	err = sendResponse(writer, protocol)
 	if err != nil {
 		return err
 	}