fix: read logic of PacketConnectionReader

proxy/trojan/client.go

@@ -2,6 +2,7 @@ package trojan
 
 import (
 	"context"
+	sync "sync"
 
 	core "github.com/v2fly/v2ray-core/v5"
 	"github.com/v2fly/v2ray-core/v5/common"
@@ -119,7 +120,10 @@ func (c *Client) Process(ctx context.Context, link *transport.Link, dialer inter
 			defer timer.SetTimeout(sessionPolicy.Timeouts.UplinkOnly)
 
 			packetReader := &PacketReader{Reader: conn}
-			splitReader := &PacketSplitReader{Reader: packetReader}
+			splitReader := &PacketConnectionReader{
+				readerAccess: &sync.Mutex{},
+				reader:       packetReader,
+			}
 
 			return udp.CopyPacketConn(packetConn, splitReader, udp.UpdateActivity(timer))
 		}

proxy/trojan/protocol.go

@@ -4,6 +4,7 @@ import (
 	"encoding/binary"
 	"io"
 	gonet "net"
+	sync "sync"
 
 	"github.com/v2fly/v2ray-core/v5/common/buf"
 	"github.com/v2fly/v2ray-core/v5/common/net"
@@ -287,25 +288,29 @@ func (r *PacketReader) ReadMultiBufferWithMetadata() (*PacketPayload, error) {
 	return &PacketPayload{Target: dest, Buffer: mb}, nil
 }
 
-type PacketSplitReader struct {
-	Reader  *PacketReader
-	Payload *PacketPayload
+type PacketConnectionReader struct {
+	readerAccess *sync.Mutex
+	reader       *PacketReader
+	payload      *PacketPayload
 }
 
-func (r *PacketSplitReader) ReadFrom(p []byte) (n int, addr gonet.Addr, err error) {
-	if r.Payload == nil || r.Payload.Buffer.IsEmpty() {
-		r.Payload, err = r.Reader.ReadMultiBufferWithMetadata()
+func (r *PacketConnectionReader) ReadFrom(p []byte) (n int, addr gonet.Addr, err error) {
+	r.readerAccess.Lock()
+	defer r.readerAccess.Unlock()
+
+	if r.payload == nil || r.payload.Buffer.IsEmpty() {
+		r.payload, err = r.reader.ReadMultiBufferWithMetadata()
 		if err != nil {
 			return
 		}
 	}
 
 	addr = &gonet.UDPAddr{
-		IP:   r.Payload.Target.Address.IP(),
-		Port: int(r.Payload.Target.Port),
+		IP:   r.payload.Target.Address.IP(),
+		Port: int(r.payload.Target.Port),
 	}
 
-	r.Payload.Buffer, n = buf.SplitBytes(r.Payload.Buffer, p)
+	r.payload.Buffer, n = buf.SplitFirstBytes(r.payload.Buffer, p)
 
 	return
 }