Hysteria client: Fix sendThrough (#6063)

And fixes https://github.com/XTLS/Xray-core/issues/6046

transport/internet/config.pb.go

@@ -730,8 +730,6 @@ type SocketConfig struct {
 	// ReceiveOriginalDestAddress is for enabling IP_RECVORIGDSTADDR socket
 	// option. This option is for UDP only.
 	ReceiveOriginalDestAddress bool                 `protobuf:"varint,4,opt,name=receive_original_dest_address,json=receiveOriginalDestAddress,proto3" json:"receive_original_dest_address,omitempty"`
-	BindAddress                []byte               `protobuf:"bytes,5,opt,name=bind_address,json=bindAddress,proto3" json:"bind_address,omitempty"`
-	BindPort                   uint32               `protobuf:"varint,6,opt,name=bind_port,json=bindPort,proto3" json:"bind_port,omitempty"`
 	AcceptProxyProtocol        bool                 `protobuf:"varint,7,opt,name=accept_proxy_protocol,json=acceptProxyProtocol,proto3" json:"accept_proxy_protocol,omitempty"`
 	DomainStrategy             DomainStrategy       `protobuf:"varint,8,opt,name=domain_strategy,json=domainStrategy,proto3,enum=xray.transport.internet.DomainStrategy" json:"domain_strategy,omitempty"`
 	DialerProxy                string               `protobuf:"bytes,9,opt,name=dialer_proxy,json=dialerProxy,proto3" json:"dialer_proxy,omitempty"`
@@ -811,20 +809,6 @@ func (x *SocketConfig) GetReceiveOriginalDestAddress() bool {
 	return false
 }
 
-func (x *SocketConfig) GetBindAddress() []byte {
-	if x != nil {
-		return x.BindAddress
-	}
-	return nil
-}
-
-func (x *SocketConfig) GetBindPort() uint32 {
-	if x != nil {
-		return x.BindPort
-	}
-	return 0
-}
-
 func (x *SocketConfig) GetAcceptProxyProtocol() bool {
 	if x != nil {
 		return x.AcceptProxyProtocol
@@ -1066,14 +1050,12 @@ const file_transport_internet_config_proto_rawDesc = "" +
 	"\x05level\x18\x03 \x01(\tR\x05level\x12\x10\n" +
 	"\x03opt\x18\x04 \x01(\tR\x03opt\x12\x14\n" +
 	"\x05value\x18\x05 \x01(\tR\x05value\x12\x12\n" +
-	"\x04type\x18\x06 \x01(\tR\x04type\"\x89\t\n" +
+	"\x04type\x18\x06 \x01(\tR\x04type\"\xc9\b\n" +
 	"\fSocketConfig\x12\x12\n" +
 	"\x04mark\x18\x01 \x01(\x05R\x04mark\x12\x10\n" +
 	"\x03tfo\x18\x02 \x01(\x05R\x03tfo\x12H\n" +
 	"\x06tproxy\x18\x03 \x01(\x0e20.xray.transport.internet.SocketConfig.TProxyModeR\x06tproxy\x12A\n" +
-	"\x1dreceive_original_dest_address\x18\x04 \x01(\bR\x1areceiveOriginalDestAddress\x12!\n" +
-	"\fbind_address\x18\x05 \x01(\fR\vbindAddress\x12\x1b\n" +
-	"\tbind_port\x18\x06 \x01(\rR\bbindPort\x122\n" +
+	"\x1dreceive_original_dest_address\x18\x04 \x01(\bR\x1areceiveOriginalDestAddress\x122\n" +
 	"\x15accept_proxy_protocol\x18\a \x01(\bR\x13acceptProxyProtocol\x12P\n" +
 	"\x0fdomain_strategy\x18\b \x01(\x0e2'.xray.transport.internet.DomainStrategyR\x0edomainStrategy\x12!\n" +
 	"\fdialer_proxy\x18\t \x01(\tR\vdialerProxy\x125\n" +

transport/internet/config.proto

@@ -124,10 +124,6 @@ message SocketConfig {
   // option. This option is for UDP only.
   bool receive_original_dest_address = 4;
 
-  bytes bind_address = 5;
-
-  uint32 bind_port = 6;
-
   bool accept_proxy_protocol = 7;
 
   DomainStrategy domain_strategy = 8;

transport/internet/hysteria/dialer.go

@@ -3,6 +3,7 @@ package hysteria
 import (
 	"context"
 	go_tls "crypto/tls"
+	"math/rand"
 	"net/http"
 	"net/url"
 	"reflect"
@@ -64,7 +65,7 @@ func (c *client) close() {
 	c.udpSM = nil
 }
 
-func (c *client) dial() error {
+func (c *client) dial(ctx context.Context) error {
 	status := c.status()
 	if status == StatusActive {
 		return nil
@@ -113,30 +114,54 @@ func (c *client) dial() error {
 	// 	quicConfig.KeepAlivePeriod = 10 * time.Second
 	// }
 
+	udpHopDialer := func(addr *net.UDPAddr) (net.PacketConn, error) {
+		conn, err := internet.DialSystem(ctx, net.UDPDestination(net.IPAddress(addr.IP), net.Port(addr.Port)), c.socketConfig)
+		if err != nil {
+			errors.LogInfoInner(context.Background(), err, "skip hop: failed to dial to dest")
+			return nil, errors.New("")
+		}
+
+		var pktConn net.PacketConn
+
+		switch c := conn.(type) {
+		case *internet.PacketConnWrapper:
+			pktConn = c.PacketConn
+		default:
+			panic(reflect.TypeOf(c))
+		}
+
+		return pktConn, nil
+	}
+
 	var pktConn net.PacketConn
 	var udpAddr *net.UDPAddr
-	var err error
-	udpAddr, err = net.ResolveUDPAddr("udp", c.dest.NetAddr())
-	if err != nil {
-		return err
-	}
 	if len(quicParams.UdpHop.Ports) > 0 {
-		pktConn, err = udphop.NewUDPHopPacketConn(udphop.ToAddrs(udpAddr.IP, quicParams.UdpHop.Ports), time.Duration(quicParams.UdpHop.IntervalMin)*time.Second, time.Duration(quicParams.UdpHop.IntervalMax)*time.Second, c.udpHopDialer)
+		index := rand.Intn(len(quicParams.UdpHop.Ports))
+		c.dest.Port = net.Port(quicParams.UdpHop.Ports[index])
+		conn, err := internet.DialSystem(ctx, c.dest, c.socketConfig)
 		if err != nil {
-			return err
-		}
-	} else {
-		conn, err := internet.DialSystem(context.Background(), c.dest, c.socketConfig)
-		if err != nil {
-			return err
+			return errors.New("failed to dial to dest").Base(err)
 		}
 		switch c := conn.(type) {
 		case *internet.PacketConnWrapper:
 			pktConn = c.PacketConn
-		case *net.UDPConn:
-			pktConn = c
+			udpAddr = conn.RemoteAddr().(*net.UDPAddr)
+		default:
+			panic(reflect.TypeOf(c))
+		}
+		pktConn = udphop.NewUDPHopPacketConn(udphop.ToAddrs(udpAddr.IP, quicParams.UdpHop.Ports), time.Duration(quicParams.UdpHop.IntervalMin)*time.Second, time.Duration(quicParams.UdpHop.IntervalMax)*time.Second, udpHopDialer, pktConn, index)
+	} else {
+		conn, err := internet.DialSystem(ctx, c.dest, c.socketConfig)
+		if err != nil {
+			return errors.New("failed to dial to dest").Base(err)
+		}
+		switch c := conn.(type) {
+		case *internet.PacketConnWrapper:
+			pktConn = c.PacketConn
+			udpAddr = c.RemoteAddr().(*net.UDPAddr)
 		case *cnc.Connection:
 			pktConn = &internet.FakePacketConn{Conn: c}
+			udpAddr = &net.UDPAddr{IP: c.RemoteAddr().(*net.TCPAddr).IP, Port: c.RemoteAddr().(*net.TCPAddr).Port}
 		default:
 			panic(reflect.TypeOf(c))
 		}
@@ -228,11 +253,11 @@ func (c *client) dial() error {
 	return nil
 }
 
-func (c *client) tcp() (stat.Connection, error) {
+func (c *client) tcp(ctx context.Context) (stat.Connection, error) {
 	c.Lock()
 	defer c.Unlock()
 
-	err := c.dial()
+	err := c.dial(ctx)
 	if err != nil {
 		return nil, err
 	}
@@ -251,11 +276,11 @@ func (c *client) tcp() (stat.Connection, error) {
 	}, nil
 }
 
-func (c *client) udp() (stat.Connection, error) {
+func (c *client) udp(ctx context.Context) (stat.Connection, error) {
 	c.Lock()
 	defer c.Unlock()
 
-	err := c.dial()
+	err := c.dial(ctx)
 	if err != nil {
 		return nil, err
 	}
@@ -271,29 +296,6 @@ func (c *client) clean() {
 	c.Unlock()
 }
 
-func (c *client) udpHopDialer(addr *net.UDPAddr) (net.PacketConn, error) {
-	conn, err := internet.DialSystem(context.Background(), net.UDPDestination(net.IPAddress(addr.IP), net.Port(addr.Port)), c.socketConfig)
-	if err != nil {
-		errors.LogInfoInner(context.Background(), err, "skip hop: failed to dial to dest")
-		return nil, errors.New("failed to dial to dest").Base(err)
-	}
-
-	var pktConn net.PacketConn
-
-	switch c := conn.(type) {
-	case *internet.PacketConnWrapper:
-		pktConn = c.PacketConn
-	case *net.UDPConn:
-		pktConn = c
-	default:
-		errors.LogInfo(context.Background(), "skip hop: invalid conn ", reflect.TypeOf(c))
-		conn.Close()
-		return nil, errors.New("invalid conn ", reflect.TypeOf(c))
-	}
-
-	return pktConn, nil
-}
-
 type dialerConf struct {
 	net.Destination
 	*internet.MemoryStreamConfig
@@ -356,9 +358,9 @@ func Dial(ctx context.Context, dest net.Destination, streamSettings *internet.Me
 	}
 
 	if datagram {
-		return c.udp()
+		return c.udp(ctx)
 	}
-	return c.tcp()
+	return c.tcp(ctx)
 }
 
 func init() {

transport/internet/hysteria/udphop/conn.go

@@ -47,7 +47,7 @@ type udpPacket struct {
 	Err  error
 }
 
-func NewUDPHopPacketConn(addrs []net.Addr, hopIntervalMin time.Duration, hopIntervalMax time.Duration, listenUDPFunc func(addr *net.UDPAddr) (net.PacketConn, error)) (net.PacketConn, error) {
+func NewUDPHopPacketConn(addrs []net.Addr, hopIntervalMin time.Duration, hopIntervalMax time.Duration, listenUDPFunc func(addr *net.UDPAddr) (net.PacketConn, error), currentConn net.PacketConn, addrIndex int) net.PacketConn {
 	if len(addrs) == 0 {
 		panic("len(addrs) == 0")
 	}
@@ -75,8 +75,8 @@ func NewUDPHopPacketConn(addrs []net.Addr, hopIntervalMin time.Duration, hopInte
 		HopIntervalMax: hopIntervalMax,
 		ListenUDPFunc:  listenUDPFunc,
 		prevConn:       nil,
-		currentConn:    nil,
-		addrIndex:      rand.Intn(len(addrs)),
+		currentConn:    currentConn,
+		addrIndex:      addrIndex,
 		recvQueue:      make(chan *udpPacket, packetQueueSize),
 		closeChan:      make(chan struct{}),
 		bufPool: sync.Pool{
@@ -85,14 +85,9 @@ func NewUDPHopPacketConn(addrs []net.Addr, hopIntervalMin time.Duration, hopInte
 			},
 		},
 	}
-	var err error
-	hConn.currentConn, err = listenUDPFunc(hConn.Addrs[hConn.addrIndex].(*net.UDPAddr))
-	if err != nil {
-		return nil, err
-	}
 	go hConn.recvLoop(hConn.currentConn)
 	go hConn.hopLoop()
-	return hConn, nil
+	return hConn
 }
 
 func (u *UdpHopPacketConn) recvLoop(conn net.PacketConn) {

transport/internet/kcp/dialer.go

@@ -58,14 +58,14 @@ func DialKCP(ctx context.Context, dest net.Destination, streamSettings *internet
 
 	if streamSettings.UdpmaskManager != nil {
 		var pktConn net.PacketConn
-		var udpAddr = conn.RemoteAddr().(*net.UDPAddr)
+		var udpAddr *net.UDPAddr
 		switch c := conn.(type) {
 		case *internet.PacketConnWrapper:
 			pktConn = c.PacketConn
-		case *net.UDPConn:
-			pktConn = c
+			udpAddr = c.RemoteAddr().(*net.UDPAddr)
 		case *cnc.Connection:
 			pktConn = &internet.FakePacketConn{Conn: c}
+			udpAddr = &net.UDPAddr{IP: c.RemoteAddr().(*net.TCPAddr).IP, Port: c.RemoteAddr().(*net.TCPAddr).Port}
 		default:
 			panic(reflect.TypeOf(c))
 		}

transport/internet/sockopt_darwin.go

@@ -288,32 +288,6 @@ func applyInboundSocketOptions(network string, fd uintptr, config *SocketConfig)
 	return nil
 }
 
-func bindAddr(fd uintptr, address []byte, port uint32) error {
-	setReuseAddr(fd)
-	setReusePort(fd)
-
-	var sockaddr unix.Sockaddr
-
-	switch len(address) {
-	case net.IPv4len:
-		a4 := &unix.SockaddrInet4{
-			Port: int(port),
-		}
-		copy(a4.Addr[:], address)
-		sockaddr = a4
-	case net.IPv6len:
-		a6 := &unix.SockaddrInet6{
-			Port: int(port),
-		}
-		copy(a6.Addr[:], address)
-		sockaddr = a6
-	default:
-		return errors.New("unexpected length of ip")
-	}
-
-	return unix.Bind(int(fd), sockaddr)
-}
-
 func setReuseAddr(fd uintptr) error {
 	if err := unix.SetsockoptInt(int(fd), unix.SOL_SOCKET, unix.SO_REUSEADDR, 1); err != nil {
 		return errors.New("failed to set SO_REUSEADDR").Base(err).AtWarning()

transport/internet/sockopt_freebsd.go

@@ -222,32 +222,6 @@ func applyInboundSocketOptions(network string, fd uintptr, config *SocketConfig)
 	return nil
 }
 
-func bindAddr(fd uintptr, ip []byte, port uint32) error {
-	setReuseAddr(fd)
-	setReusePort(fd)
-
-	var sockaddr syscall.Sockaddr
-
-	switch len(ip) {
-	case net.IPv4len:
-		a4 := &syscall.SockaddrInet4{
-			Port: int(port),
-		}
-		copy(a4.Addr[:], ip)
-		sockaddr = a4
-	case net.IPv6len:
-		a6 := &syscall.SockaddrInet6{
-			Port: int(port),
-		}
-		copy(a6.Addr[:], ip)
-		sockaddr = a6
-	default:
-		return errors.New("unexpected length of ip")
-	}
-
-	return syscall.Bind(int(fd), sockaddr)
-}
-
 func setReuseAddr(fd uintptr) error {
 	if err := syscall.SetsockoptInt(int(fd), syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1); err != nil {
 		return errors.New("failed to set SO_REUSEADDR").Base(err).AtWarning()

transport/internet/sockopt_linux.go

@@ -2,7 +2,6 @@ package internet
 
 import (
 	"context"
-	"net"
 	"runtime"
 	"strconv"
 	"strings"
@@ -12,32 +11,6 @@ import (
 	"golang.org/x/sys/unix"
 )
 
-func bindAddr(fd uintptr, ip []byte, port uint32) error {
-	setReuseAddr(fd)
-	setReusePort(fd)
-
-	var sockaddr syscall.Sockaddr
-
-	switch len(ip) {
-	case net.IPv4len:
-		a4 := &syscall.SockaddrInet4{
-			Port: int(port),
-		}
-		copy(a4.Addr[:], ip)
-		sockaddr = a4
-	case net.IPv6len:
-		a6 := &syscall.SockaddrInet6{
-			Port: int(port),
-		}
-		copy(a6.Addr[:], ip)
-		sockaddr = a6
-	default:
-		return errors.New("unexpected length of ip")
-	}
-
-	return syscall.Bind(int(fd), sockaddr)
-}
-
 // applyOutboundSocketOptions applies socket options for outbound connection.
 // note that unlike other part of Xray, this function needs network with speified network stack(tcp4/tcp6/udp4/udp6)
 func applyOutboundSocketOptions(network string, address string, fd uintptr, config *SocketConfig) error {

transport/internet/sockopt_other.go

@@ -11,10 +11,6 @@ func applyInboundSocketOptions(network string, fd uintptr, config *SocketConfig)
 	return nil
 }
 
-func bindAddr(fd uintptr, ip []byte, port uint32) error {
-	return nil
-}
-
 func setReuseAddr(fd uintptr) error {
 	return nil
 }

transport/internet/sockopt_windows.go

@@ -181,10 +181,6 @@ func applyInboundSocketOptions(network string, fd uintptr, config *SocketConfig)
 	return nil
 }
 
-func bindAddr(fd uintptr, ip []byte, port uint32) error {
-	return nil
-}
-
 func setReuseAddr(fd uintptr) error {
 	return nil
 }

transport/internet/splithttp/dialer.go

@@ -5,6 +5,7 @@ import (
 	gotls "crypto/tls"
 	"fmt"
 	"io"
+	"math/rand"
 	"net/http"
 	"net/http/httptrace"
 	"net/url"
@@ -199,7 +200,7 @@ func createHTTPClient(dest net.Destination, streamSettings *internet.MemoryStrea
 					conn, err := internet.DialSystem(ctx, net.UDPDestination(net.IPAddress(addr.IP), net.Port(addr.Port)), streamSettings.SocketSettings)
 					if err != nil {
 						errors.LogInfoInner(context.Background(), err, "skip hop: failed to dial to dest")
-						return nil, errors.New("failed to dial to dest").Base(err)
+						return nil, errors.New("")
 					}
 
 					var pktConn net.PacketConn
@@ -207,12 +208,8 @@ func createHTTPClient(dest net.Destination, streamSettings *internet.MemoryStrea
 					switch c := conn.(type) {
 					case *internet.PacketConnWrapper:
 						pktConn = c.PacketConn
-					case *net.UDPConn:
-						pktConn = c
 					default:
-						errors.LogInfo(context.Background(), "skip hop: invalid conn ", reflect.TypeOf(c))
-						conn.Close()
-						return nil, errors.New("invalid conn ", reflect.TypeOf(c))
+						panic(reflect.TypeOf(c))
 					}
 
 					return pktConn, nil
@@ -220,28 +217,33 @@ func createHTTPClient(dest net.Destination, streamSettings *internet.MemoryStrea
 
 				var pktConn net.PacketConn
 				var udpAddr *net.UDPAddr
-				var err error
-				udpAddr, err = net.ResolveUDPAddr("udp", dest.NetAddr())
-				if err != nil {
-					return nil, err
-				}
 				if len(quicParams.UdpHop.Ports) > 0 {
-					pktConn, err = udphop.NewUDPHopPacketConn(udphop.ToAddrs(udpAddr.IP, quicParams.UdpHop.Ports), time.Duration(quicParams.UdpHop.IntervalMin)*time.Second, time.Duration(quicParams.UdpHop.IntervalMax)*time.Second, udpHopDialer)
-					if err != nil {
-						return nil, err
-					}
-				} else {
+					index := rand.Intn(len(quicParams.UdpHop.Ports))
+					dest.Port = net.Port(quicParams.UdpHop.Ports[index])
 					conn, err := internet.DialSystem(ctx, dest, streamSettings.SocketSettings)
 					if err != nil {
-						return nil, err
+						return nil, errors.New("failed to dial to dest").Base(err)
 					}
 					switch c := conn.(type) {
 					case *internet.PacketConnWrapper:
 						pktConn = c.PacketConn
-					case *net.UDPConn:
-						pktConn = c
+						udpAddr = conn.RemoteAddr().(*net.UDPAddr)
+					default:
+						panic(reflect.TypeOf(c))
+					}
+					pktConn = udphop.NewUDPHopPacketConn(udphop.ToAddrs(udpAddr.IP, quicParams.UdpHop.Ports), time.Duration(quicParams.UdpHop.IntervalMin)*time.Second, time.Duration(quicParams.UdpHop.IntervalMax)*time.Second, udpHopDialer, pktConn, index)
+				} else {
+					conn, err := internet.DialSystem(ctx, dest, streamSettings.SocketSettings)
+					if err != nil {
+						return nil, errors.New("failed to dial to dest").Base(err)
+					}
+					switch c := conn.(type) {
+					case *internet.PacketConnWrapper:
+						pktConn = c.PacketConn
+						udpAddr = c.RemoteAddr().(*net.UDPAddr)
 					case *cnc.Connection:
 						pktConn = &internet.FakePacketConn{Conn: c}
+						udpAddr = &net.UDPAddr{IP: c.RemoteAddr().(*net.TCPAddr).IP, Port: c.RemoteAddr().(*net.TCPAddr).Port}
 					default:
 						panic(reflect.TypeOf(c))
 					}

transport/internet/splithttp/hub.go

@@ -441,7 +441,7 @@ type Listener struct {
 	server     http.Server
 	h3server   *http3.Server
 	listener   net.Listener
-	h3listener Qface
+	h3listener http3.QUICListener
 	config     *Config
 	addConn    internet.ConnHandler
 	isH3       bool
@@ -519,8 +519,8 @@ func ListenXH(ctx context.Context, address net.Address, port net.Port, streamSet
 			return nil, errors.New("failed to listen QUIC for XHTTP/3 on ", address, ":", port).Base(err)
 		}
 		l.h3listener = &QListener{
-			Qface:      l.h3listener,
-			quicParams: quicParams,
+			QUICListener: l.h3listener,
+			quicParams:   quicParams,
 		}
 		errors.LogInfo(ctx, "listening QUIC for XHTTP/3 on ", address, ":", port)
 
@@ -615,21 +615,13 @@ func init() {
 	common.Must(internet.RegisterTransportListener(protocolName, ListenXH))
 }
 
-type Qface interface {
-	Accept(ctx context.Context) (*quic.Conn, error)
-	Addr() net.Addr
-	Close() error
-}
-
-var _ Qface = (*quic.EarlyListener)(nil)
-
 type QListener struct {
-	Qface
+	http3.QUICListener
 	quicParams *internet.QuicParams
 }
 
 func (l *QListener) Accept(ctx context.Context) (*quic.Conn, error) {
-	conn, err := l.Qface.Accept(ctx)
+	conn, err := l.QUICListener.Accept(ctx)
 	if err != nil {
 		return nil, err
 	}

transport/internet/system_dialer.go

@@ -44,14 +44,10 @@ func resolveSrcAddr(network net.Network, src net.Address) net.Addr {
 	}
 }
 
-func hasBindAddr(sockopt *SocketConfig) bool {
-	return sockopt != nil && len(sockopt.BindAddress) > 0 && sockopt.BindPort > 0
-}
-
 func (d *DefaultSystemDialer) Dial(ctx context.Context, src net.Address, dest net.Destination, sockopt *SocketConfig) (net.Conn, error) {
 	errors.LogDebug(ctx, "dialing to "+dest.String())
 
-	if dest.Network == net.Network_UDP && !hasBindAddr(sockopt) {
+	if dest.Network == net.Network_UDP {
 		srcAddr := resolveSrcAddr(net.Network_UDP, src)
 		if srcAddr == nil {
 			srcAddr = &net.UDPAddr{
@@ -132,11 +128,6 @@ func (d *DefaultSystemDialer) Dial(ctx context.Context, src net.Address, dest ne
 					if err := applyOutboundSocketOptions(network, address, fd, sockopt); err != nil {
 						errors.LogInfoInner(ctx, err, "failed to apply socket options")
 					}
-					if dest.Network == net.Network_UDP && hasBindAddr(sockopt) {
-						if err := bindAddr(fd, sockopt.BindAddress, sockopt.BindPort); err != nil {
-							errors.LogInfoInner(ctx, err, "failed to bind source address to ", sockopt.BindAddress)
-						}
-					}
 				}
 			})
 		}
@@ -228,7 +219,7 @@ type FakePacketConn struct {
 
 func (c *FakePacketConn) ReadFrom(p []byte) (n int, addr net.Addr, err error) {
 	n, err = c.Read(p)
-	return n, c.RemoteAddr(), err
+	return n, &net.UDPAddr{IP: c.Conn.RemoteAddr().(*net.TCPAddr).IP, Port: c.Conn.RemoteAddr().(*net.TCPAddr).Port}, err
 }
 
 func (c *FakePacketConn) WriteTo(p []byte, _ net.Addr) (n int, err error) {
@@ -236,15 +227,5 @@ func (c *FakePacketConn) WriteTo(p []byte, _ net.Addr) (n int, err error) {
 }
 
 func (c *FakePacketConn) LocalAddr() net.Addr {
-	return &net.UDPAddr{
-		IP:   []byte{0, 0, 0, 0},
-		Port: 0,
-	}
-}
-
-func (c *FakePacketConn) RemoteAddr() net.Addr {
-	return &net.UDPAddr{
-		IP:   []byte{0, 0, 0, 0},
-		Port: 0,
-	}
+	return &net.UDPAddr{IP: c.Conn.LocalAddr().(*net.TCPAddr).IP, Port: c.Conn.LocalAddr().(*net.TCPAddr).Port}
 }

transport/internet/udp/dialer.go

@@ -26,14 +26,14 @@ func init() {
 
 			if streamSettings != nil && streamSettings.UdpmaskManager != nil {
 				var pktConn net.PacketConn
-				var udpAddr = conn.RemoteAddr().(*net.UDPAddr)
+				var udpAddr *net.UDPAddr
 				switch c := conn.(type) {
 				case *internet.PacketConnWrapper:
 					pktConn = c.PacketConn
-				case *net.UDPConn:
-					pktConn = c
+					udpAddr = c.RemoteAddr().(*net.UDPAddr)
 				case *cnc.Connection:
 					pktConn = &internet.FakePacketConn{Conn: c}
+					udpAddr = &net.UDPAddr{IP: c.RemoteAddr().(*net.TCPAddr).IP, Port: c.RemoteAddr().(*net.TCPAddr).Port}
 				default:
 					panic(reflect.TypeOf(c))
 				}