Fix processing domain address in packet

common/dialer/resolve.go

@@ -73,7 +73,7 @@ func (d *ResolveDialer) ListenPacket(ctx context.Context, destination M.Socksadd
 	if err != nil {
 		return nil, err
 	}
-	return bufio.NewNATPacketConn(bufio.NewPacketConn(conn), destination, M.SocksaddrFrom(destinationAddress, destination.Port)), nil
+	return bufio.NewNATPacketConn(bufio.NewPacketConn(conn), M.SocksaddrFrom(destinationAddress, destination.Port), destination), nil
 }
 
 func (d *ResolveDialer) Upstream() any {

common/mux/client.go

@@ -413,7 +413,11 @@ func (c *ClientPacketAddrConn) ReadFrom(p []byte) (n int, addr net.Addr, err err
 	if err != nil {
 		return
 	}
-	addr = destination.UDPAddr()
+	if destination.IsFqdn() {
+		addr = destination
+	} else {
+		addr = destination.UDPAddr()
+	}
 	var length uint16
 	err = binary.Read(c.ExtendedConn, binary.BigEndian, &length)
 	if err != nil {

transport/hysteria/protocol.go

@@ -498,7 +498,12 @@ func (c *PacketConn) ReadFrom(p []byte) (n int, addr net.Addr, err error) {
 		return
 	}
 	n = copy(p, msg.Data)
-	addr = M.ParseSocksaddrHostPort(msg.Host, msg.Port).UDPAddr()
+	destination := M.ParseSocksaddrHostPort(msg.Host, msg.Port)
+	if destination.IsFqdn() {
+		addr = destination
+	} else {
+		addr = destination.UDPAddr()
+	}
 	return
 }
 

transport/trojan/protocol.go

@@ -131,7 +131,11 @@ func (c *ClientPacketConn) ReadFrom(p []byte) (n int, addr net.Addr, err error)
 		return
 	}
 	n = buffer.Len()
-	addr = destination.UDPAddr()
+	if destination.IsFqdn() {
+		addr = destination
+	} else {
+		addr = destination.UDPAddr()
+	}
 	return
 }
 

transport/vless/client.go

@@ -196,7 +196,11 @@ func (c *PacketConn) ReadFrom(p []byte) (n int, addr net.Addr, err error) {
 	if err != nil {
 		return
 	}
-	addr = c.destination.UDPAddr()
+	if c.destination.IsFqdn() {
+		addr = c.destination
+	} else {
+		addr = c.destination.UDPAddr()
+	}
 	return
 }
 

transport/vless/service.go

@@ -146,7 +146,11 @@ func (c *serverPacketConn) ReadFrom(p []byte) (n int, addr net.Addr, err error)
 	if err != nil {
 		return
 	}
-	addr = c.destination.UDPAddr()
+	if c.destination.IsFqdn() {
+		addr = c.destination
+	} else {
+		addr = c.destination.UDPAddr()
+	}
 	return
 }