Fix none method read buffer

go.mod

@@ -31,7 +31,7 @@ require (
 	github.com/sagernet/sing-mux v0.3.2
 	github.com/sagernet/sing-quic v0.4.1-0.20250423030647-0eb05f373a76
 	github.com/sagernet/sing-shadowsocks v0.2.7
-	github.com/sagernet/sing-shadowsocks2 v0.2.0
+	github.com/sagernet/sing-shadowsocks2 v0.2.1
 	github.com/sagernet/sing-shadowtls v0.2.0
 	github.com/sagernet/sing-tun v0.6.5
 	github.com/sagernet/sing-vmess v0.2.1

go.sum

@@ -129,8 +129,8 @@ github.com/sagernet/sing-quic v0.4.1-0.20250423030647-0eb05f373a76 h1:iwpCX6H3nZ
 github.com/sagernet/sing-quic v0.4.1-0.20250423030647-0eb05f373a76/go.mod h1:tqPa0/Wqa19MkkSlKVZZX5sHxtiDR9BROcn4ufcbVdY=
 github.com/sagernet/sing-shadowsocks v0.2.7 h1:zaopR1tbHEw5Nk6FAkM05wCslV6ahVegEZaKMv9ipx8=
 github.com/sagernet/sing-shadowsocks v0.2.7/go.mod h1:0rIKJZBR65Qi0zwdKezt4s57y/Tl1ofkaq6NlkzVuyE=
-github.com/sagernet/sing-shadowsocks2 v0.2.0 h1:wpZNs6wKnR7mh1wV9OHwOyUr21VkS3wKFHi+8XwgADg=
-github.com/sagernet/sing-shadowsocks2 v0.2.0/go.mod h1:RnXS0lExcDAovvDeniJ4IKa2IuChrdipolPYWBv9hWQ=
+github.com/sagernet/sing-shadowsocks2 v0.2.1 h1:dWV9OXCeFPuYGHb6IRqlSptVnSzOelnqqs2gQ2/Qioo=
+github.com/sagernet/sing-shadowsocks2 v0.2.1/go.mod h1:RnXS0lExcDAovvDeniJ4IKa2IuChrdipolPYWBv9hWQ=
 github.com/sagernet/sing-shadowtls v0.2.0 h1:cLKe4OAOFwuhmAIuPLj//CIL7Q9js+pIDardhJ+/osk=
 github.com/sagernet/sing-shadowtls v0.2.0/go.mod h1:agU+Fw5X+xnWVyRHyFthoZCX3MfWKCFPm4JUf+1oaxo=
 github.com/sagernet/sing-tun v0.6.5 h1:nGfD6GNq/r0tEjdZHOV3BS6fydSmd4kBAokU5rffssg=

route/route.go

@@ -496,7 +496,9 @@ func (r *Router) actionSniff(
 		return
 	}
 	if inputConn != nil {
-		sniffBuffer := buf.NewPacket()
+		if len(action.StreamSniffers) == 0 && len(action.PacketSniffers) > 0 {
+			return
+		}
 		var streamSniffers []sniff.StreamSniffer
 		if len(action.StreamSniffers) > 0 {
 			streamSniffers = action.StreamSniffers
@@ -510,6 +512,7 @@ func (r *Router) actionSniff(
 				sniff.RDP,
 			}
 		}
+		sniffBuffer := buf.NewPacket()
 		err := sniff.PeekStream(
 			ctx,
 			metadata,
@@ -541,10 +544,25 @@ func (r *Router) actionSniff(
 			sniffBuffer.Release()
 		}
 	} else if inputPacketConn != nil {
-		if metadata.PacketSniffError != nil && !errors.Is(metadata.PacketSniffError, sniff.ErrNeedMoreData) {
+		if len(action.PacketSniffers) == 0 && len(action.StreamSniffers) > 0 {
+			return
+		} else if metadata.PacketSniffError != nil && !errors.Is(metadata.PacketSniffError, sniff.ErrNeedMoreData) {
 			r.logger.DebugContext(ctx, "packet sniff skipped due to previous error: ", metadata.PacketSniffError)
 			return
 		}
+		var packetSniffers []sniff.PacketSniffer
+		if len(action.PacketSniffers) > 0 {
+			packetSniffers = action.PacketSniffers
+		} else {
+			packetSniffers = []sniff.PacketSniffer{
+				sniff.DomainNameQuery,
+				sniff.QUICClientHello,
+				sniff.STUNMessage,
+				sniff.UTP,
+				sniff.UDPTracker,
+				sniff.DTLSRecord,
+			}
+		}
 		for {
 			var (
 				sniffBuffer = buf.NewPacket()
@@ -584,19 +602,6 @@ func (r *Router) actionSniff(
 						sniff.QUICClientHello,
 					)
 				} else {
-					var packetSniffers []sniff.PacketSniffer
-					if len(action.PacketSniffers) > 0 {
-						packetSniffers = action.PacketSniffers
-					} else {
-						packetSniffers = []sniff.PacketSniffer{
-							sniff.DomainNameQuery,
-							sniff.QUICClientHello,
-							sniff.STUNMessage,
-							sniff.UTP,
-							sniff.UDPTracker,
-							sniff.DTLSRecord,
-						}
-					}
 					err = sniff.PeekPacket(
 						ctx, metadata,
 						sniffBuffer.Bytes(),