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chore: add WaitReadFrom support in ssr

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This commit is contained in:
wwqgtxx 2023-05-28 22:51:26 +08:00
parent 097f3e250c
commit 8e88e0b9f5
20 changed files with 182 additions and 88 deletions
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2
adapter/outbound/hysteria.go
View file

@ -19,7 +19,6 @@ import (
"github.com/metacubex/quic-go/congestion"
M "github.com/sagernet/sing/common/metadata"
N "github.com/Dreamacro/clash/common/net"
"github.com/Dreamacro/clash/component/dialer"
"github.com/Dreamacro/clash/component/proxydialer"
tlsC "github.com/Dreamacro/clash/component/tls"
@ -325,7 +324,6 @@ func (c *hyPacketConn) WaitReadFrom() (data []byte, put func(), addr net.Addr, e
return
}
data = b
put = N.NilPut
addr = M.ParseSocksaddr(addrStr).UDPAddr()
return
}

34
adapter/outbound/shadowsocks.go
View file

@ -16,7 +16,6 @@ import (
"github.com/Dreamacro/clash/transport/restls"
obfs "github.com/Dreamacro/clash/transport/simple-obfs"
shadowtls "github.com/Dreamacro/clash/transport/sing-shadowtls"
"github.com/Dreamacro/clash/transport/socks5"
v2rayObfs "github.com/Dreamacro/clash/transport/v2ray-plugin"
restlsC "github.com/3andne/restls-client-go"
@ -330,36 +329,3 @@ func NewShadowSocks(option ShadowSocksOption) (*ShadowSocks, error) {
restlsConfig: restlsConfig,
}, nil
}
type ssPacketConn struct {
net.PacketConn
rAddr net.Addr
}
func (spc *ssPacketConn) WriteTo(b []byte, addr net.Addr) (n int, err error) {
packet, err := socks5.EncodeUDPPacket(socks5.ParseAddrToSocksAddr(addr), b)
if err != nil {
return
}
return spc.PacketConn.WriteTo(packet[3:], spc.rAddr)
}
func (spc *ssPacketConn) ReadFrom(b []byte) (int, net.Addr, error) {
n, _, e := spc.PacketConn.ReadFrom(b)
if e != nil {
return 0, nil, e
}
addr := socks5.SplitAddr(b[:n])
if addr == nil {
return 0, nil, errors.New("parse addr error")
}
udpAddr := addr.UDPAddr()
if udpAddr == nil {
return 0, nil, errors.New("parse addr error")
}
copy(b, b[len(addr):])
return n - len(addr), udpAddr, e
}

68
adapter/outbound/shadowsocksr.go
View file

@ -2,16 +2,19 @@ package outbound
import (
"context"
"errors"
"fmt"
"net"
"strconv"
N "github.com/Dreamacro/clash/common/net"
"github.com/Dreamacro/clash/component/dialer"
"github.com/Dreamacro/clash/component/proxydialer"
C "github.com/Dreamacro/clash/constant"
"github.com/Dreamacro/clash/transport/shadowsocks/core"
"github.com/Dreamacro/clash/transport/shadowsocks/shadowaead"
"github.com/Dreamacro/clash/transport/shadowsocks/shadowstream"
"github.com/Dreamacro/clash/transport/socks5"
"github.com/Dreamacro/clash/transport/ssr/obfs"
"github.com/Dreamacro/clash/transport/ssr/protocol"
)
@ -110,9 +113,9 @@ func (ssr *ShadowSocksR) ListenPacketWithDialer(ctx context.Context, dialer C.Di
return nil, err
}
pc = ssr.cipher.PacketConn(pc)
pc = ssr.protocol.PacketConn(pc)
return newPacketConn(&ssPacketConn{PacketConn: pc, rAddr: addr}, ssr), nil
epc := ssr.cipher.PacketConn(N.NewEnhancePacketConn(pc))
epc = ssr.protocol.PacketConn(epc)
return newPacketConn(&ssrPacketConn{EnhancePacketConn: epc, rAddr: addr}, ssr), nil
}
// SupportWithDialer implements C.ProxyAdapter
@ -188,3 +191,62 @@ func NewShadowSocksR(option ShadowSocksROption) (*ShadowSocksR, error) {
protocol: protocol,
}, nil
}
type ssrPacketConn struct {
N.EnhancePacketConn
rAddr net.Addr
}
func (spc *ssrPacketConn) WriteTo(b []byte, addr net.Addr) (n int, err error) {
packet, err := socks5.EncodeUDPPacket(socks5.ParseAddrToSocksAddr(addr), b)
if err != nil {
return
}
return spc.EnhancePacketConn.WriteTo(packet[3:], spc.rAddr)
}
func (spc *ssrPacketConn) ReadFrom(b []byte) (int, net.Addr, error) {
n, _, e := spc.EnhancePacketConn.ReadFrom(b)
if e != nil {
return 0, nil, e
}
addr := socks5.SplitAddr(b[:n])
if addr == nil {
return 0, nil, errors.New("parse addr error")
}
udpAddr := addr.UDPAddr()
if udpAddr == nil {
return 0, nil, errors.New("parse addr error")
}
copy(b, b[len(addr):])
return n - len(addr), udpAddr, e
}
func (spc *ssrPacketConn) WaitReadFrom() (data []byte, put func(), addr net.Addr, err error) {
data, put, _, err = spc.EnhancePacketConn.WaitReadFrom()
if err != nil {
return nil, nil, nil, err
}
_addr := socks5.SplitAddr(data)
if _addr == nil {
if put != nil {
put()
}
return nil, nil, nil, errors.New("parse addr error")
}
addr = _addr.UDPAddr()
if addr == nil {
if put != nil {
put()
}
return nil, nil, nil, errors.New("parse addr error")
}
data = data[len(_addr):]
return
}

1
common/net/packet.go
View file

@ -8,7 +8,6 @@ import (
type EnhancePacketConn = packet.EnhancePacketConn
type WaitReadFrom = packet.WaitReadFrom
var NilPut = packet.NilPut
var NewEnhancePacketConn = packet.NewEnhancePacketConn
var NewThreadSafePacketConn = packet.NewThreadSafePacketConn
var NewRefPacketConn = packet.NewRefPacketConn

2
common/net/packet/packet.go
View file

@ -10,8 +10,6 @@ type WaitReadFrom interface {
WaitReadFrom() (data []byte, put func(), addr net.Addr, err error)
}
func NilPut() {}
type EnhancePacketConn interface {
net.PacketConn
WaitReadFrom

2
go.mod
View file

@ -22,7 +22,7 @@ require (
github.com/mdlayher/netlink v1.7.2
github.com/metacubex/quic-go v0.33.3-0.20230510010206-687b537b6a58
github.com/metacubex/sing-shadowsocks v0.2.2-0.20230509230448-a5157cc00a1c
github.com/metacubex/sing-shadowsocks2 v0.0.0-20230519030442-556ef530768f
github.com/metacubex/sing-shadowsocks2 v0.0.0-20230528144023-05418c94ed2d
github.com/metacubex/sing-tun v0.1.5-0.20230509224930-30065d4b6376
github.com/metacubex/sing-wireguard v0.0.0-20230426030325-41db09ae771a
github.com/miekg/dns v1.1.54

4
go.sum
View file

@ -100,8 +100,8 @@ github.com/metacubex/sing v0.0.0-20230526162852-6afe73474070 h1:AT/Qfe9MvCxyrI9u
github.com/metacubex/sing v0.0.0-20230526162852-6afe73474070/go.mod h1:Ta8nHnDLAwqySzKhGoKk4ZIB+vJ3GTKj7UPrWYvM+4w=
github.com/metacubex/sing-shadowsocks v0.2.2-0.20230509230448-a5157cc00a1c h1:LpVNvlW/xE+mR8z76xJeYZlYznZXEmU4TeWeuygYdJg=
github.com/metacubex/sing-shadowsocks v0.2.2-0.20230509230448-a5157cc00a1c/go.mod h1:4uQQReKMTU7KTfOykVBe/oGJ00pl38d+BYJ99+mx26s=
github.com/metacubex/sing-shadowsocks2 v0.0.0-20230519030442-556ef530768f h1:aWgVMoAm5V2Ur9key6L//mUSBrVMl/zw/4GDG4ZjyZI=
github.com/metacubex/sing-shadowsocks2 v0.0.0-20230519030442-556ef530768f/go.mod h1:jVDD4N22bDPPKA73NvB7aqdlLWiAwv8D+jx7HwhcWak=
github.com/metacubex/sing-shadowsocks2 v0.0.0-20230528144023-05418c94ed2d h1:lWbWl3pZA1x8TgYDw07jo1u5RtbBRIlxuJDV4FW0WeQ=
github.com/metacubex/sing-shadowsocks2 v0.0.0-20230528144023-05418c94ed2d/go.mod h1:jVDD4N22bDPPKA73NvB7aqdlLWiAwv8D+jx7HwhcWak=
github.com/metacubex/sing-tun v0.1.5-0.20230509224930-30065d4b6376 h1:zKNsbFQyleMFAP7NJYRew9sEMJuniuODH3V0FdWnEtk=
github.com/metacubex/sing-tun v0.1.5-0.20230509224930-30065d4b6376/go.mod h1:BMfG00enVf90/CzcdX9PK3Dymgl7BZqHXJfexEyB7Cc=
github.com/metacubex/sing-vmess v0.1.5-0.20230520082358-78b126617899 h1:iRfcuztp7REfmOyasSlCL/pqNWfUDMTJ2CwbGpxpeks=

21
listener/shadowsocks/udp.go
View file

@ -4,7 +4,7 @@ import (
"net"
"github.com/Dreamacro/clash/adapter/inbound"
"github.com/Dreamacro/clash/common/pool"
N "github.com/Dreamacro/clash/common/net"
"github.com/Dreamacro/clash/common/sockopt"
C "github.com/Dreamacro/clash/constant"
"github.com/Dreamacro/clash/log"
@ -29,19 +29,20 @@ func NewUDP(addr string, pickCipher core.Cipher, in chan<- C.PacketAdapter) (*UD
}
sl := &UDPListener{l, false}
conn := pickCipher.PacketConn(l)
conn := pickCipher.PacketConn(N.NewEnhancePacketConn(l))
go func() {
for {
buf := pool.Get(pool.UDPBufferSize)
n, remoteAddr, err := conn.ReadFrom(buf)
data, put, remoteAddr, err := conn.WaitReadFrom()
if err != nil {
pool.Put(buf)
if put != nil {
put()
}
if sl.closed {
break
}
continue
}
handleSocksUDP(conn, in, buf[:n], remoteAddr)
handleSocksUDP(conn, in, data, put, remoteAddr)
}
}()
@ -57,11 +58,13 @@ func (l *UDPListener) LocalAddr() net.Addr {
return l.packetConn.LocalAddr()
}
func handleSocksUDP(pc net.PacketConn, in chan<- C.PacketAdapter, buf []byte, addr net.Addr) {
func handleSocksUDP(pc net.PacketConn, in chan<- C.PacketAdapter, buf []byte, put func(), addr net.Addr) {
tgtAddr := socks5.SplitAddr(buf)
if tgtAddr == nil {
// Unresolved UDP packet, return buffer to the pool
pool.Put(buf)
if put != nil {
put()
}
return
}
target := socks5.ParseAddr(tgtAddr.String())
@ -71,7 +74,7 @@ func handleSocksUDP(pc net.PacketConn, in chan<- C.PacketAdapter, buf []byte, ad
pc: pc,
rAddr: addr,
payload: payload,
bufRef: buf,
put: put,
}
select {
case in <- inbound.NewPacket(target, packet, C.SHADOWSOCKS):

7
listener/shadowsocks/utils.go
View file

@ -6,7 +6,6 @@ import (
"net"
"net/url"
"github.com/Dreamacro/clash/common/pool"
"github.com/Dreamacro/clash/transport/socks5"
)
@ -14,7 +13,7 @@ type packet struct {
pc net.PacketConn
rAddr net.Addr
payload []byte
bufRef []byte
put func()
}
func (c *packet) Data() []byte {
@ -37,7 +36,9 @@ func (c *packet) LocalAddr() net.Addr {
}
func (c *packet) Drop() {
pool.Put(c.bufRef)
if c.put != nil {
c.put()
}
}
func (c *packet) InAddr() net.Addr {

9
transport/shadowsocks/core/cipher.go
View file

@ -7,6 +7,7 @@ import (
"sort"
"strings"
N "github.com/Dreamacro/clash/common/net"
"github.com/Dreamacro/clash/transport/shadowsocks/shadowaead"
"github.com/Dreamacro/clash/transport/shadowsocks/shadowstream"
)
@ -21,7 +22,7 @@ type StreamConnCipher interface {
}
type PacketConnCipher interface {
PacketConn(net.PacketConn) net.PacketConn
PacketConn(N.EnhancePacketConn) N.EnhancePacketConn
}
// ErrCipherNotSupported occurs when a cipher is not supported (likely because of security concerns).
@ -128,7 +129,7 @@ type AeadCipher struct {
}
func (aead *AeadCipher) StreamConn(c net.Conn) net.Conn { return shadowaead.NewConn(c, aead) }
func (aead *AeadCipher) PacketConn(c net.PacketConn) net.PacketConn {
func (aead *AeadCipher) PacketConn(c N.EnhancePacketConn) N.EnhancePacketConn {
return shadowaead.NewPacketConn(c, aead)
}
@ -139,7 +140,7 @@ type StreamCipher struct {
}
func (ciph *StreamCipher) StreamConn(c net.Conn) net.Conn { return shadowstream.NewConn(c, ciph) }
func (ciph *StreamCipher) PacketConn(c net.PacketConn) net.PacketConn {
func (ciph *StreamCipher) PacketConn(c N.EnhancePacketConn) N.EnhancePacketConn {
return shadowstream.NewPacketConn(c, ciph)
}
@ -148,7 +149,7 @@ func (ciph *StreamCipher) PacketConn(c net.PacketConn) net.PacketConn {
type dummy struct{}
func (dummy) StreamConn(c net.Conn) net.Conn { return c }
func (dummy) PacketConn(c net.PacketConn) net.PacketConn { return c }
func (dummy) PacketConn(c N.EnhancePacketConn) N.EnhancePacketConn { return c }
// key-derivation function from original Shadowsocks
func Kdf(password string, keyLen int) []byte {

30
transport/shadowsocks/shadowaead/packet.go
View file

@ -6,6 +6,7 @@ import (
"io"
"net"
N "github.com/Dreamacro/clash/common/net"
"github.com/Dreamacro/clash/common/pool"
)
@ -57,15 +58,15 @@ func Unpack(dst, pkt []byte, ciph Cipher) ([]byte, error) {
}
type PacketConn struct {
net.PacketConn
N.EnhancePacketConn
Cipher
}
const maxPacketSize = 64 * 1024
// NewPacketConn wraps a net.PacketConn with cipher
func NewPacketConn(c net.PacketConn, ciph Cipher) *PacketConn {
return &PacketConn{PacketConn: c, Cipher: ciph}
// NewPacketConn wraps an N.EnhancePacketConn with cipher
func NewPacketConn(c N.EnhancePacketConn, ciph Cipher) *PacketConn {
return &PacketConn{EnhancePacketConn: c, Cipher: ciph}
}
// WriteTo encrypts b and write to addr using the embedded PacketConn.
@ -76,13 +77,13 @@ func (c *PacketConn) WriteTo(b []byte, addr net.Addr) (int, error) {
if err != nil {
return 0, err
}
_, err = c.PacketConn.WriteTo(buf, addr)
_, err = c.EnhancePacketConn.WriteTo(buf, addr)
return len(b), err
}
// ReadFrom reads from the embedded PacketConn and decrypts into b.
func (c *PacketConn) ReadFrom(b []byte) (int, net.Addr, error) {
n, addr, err := c.PacketConn.ReadFrom(b)
n, addr, err := c.EnhancePacketConn.ReadFrom(b)
if err != nil {
return n, addr, err
}
@ -93,3 +94,20 @@ func (c *PacketConn) ReadFrom(b []byte) (int, net.Addr, error) {
copy(b, bb)
return len(bb), addr, err
}
func (c *PacketConn) WaitReadFrom() (data []byte, put func(), addr net.Addr, err error) {
data, put, addr, err = c.EnhancePacketConn.WaitReadFrom()
if err != nil {
return
}
data, err = Unpack(data[c.Cipher.SaltSize():], data, c)
if err != nil {
if put != nil {
put()
}
data = nil
put = nil
return
}
return
}

30
transport/shadowsocks/shadowstream/packet.go
View file

@ -6,6 +6,7 @@ import (
"io"
"net"
N "github.com/Dreamacro/clash/common/net"
"github.com/Dreamacro/clash/common/pool"
)
@ -43,13 +44,13 @@ func Unpack(dst, pkt []byte, s Cipher) ([]byte, error) {
}
type PacketConn struct {
net.PacketConn
N.EnhancePacketConn
Cipher
}
// NewPacketConn wraps a net.PacketConn with stream cipher encryption/decryption.
func NewPacketConn(c net.PacketConn, ciph Cipher) *PacketConn {
return &PacketConn{PacketConn: c, Cipher: ciph}
// NewPacketConn wraps an N.EnhancePacketConn with stream cipher encryption/decryption.
func NewPacketConn(c N.EnhancePacketConn, ciph Cipher) *PacketConn {
return &PacketConn{EnhancePacketConn: c, Cipher: ciph}
}
const maxPacketSize = 64 * 1024
@ -61,12 +62,12 @@ func (c *PacketConn) WriteTo(b []byte, addr net.Addr) (int, error) {
if err != nil {
return 0, err
}
_, err = c.PacketConn.WriteTo(buf, addr)
_, err = c.EnhancePacketConn.WriteTo(buf, addr)
return len(b), err
}
func (c *PacketConn) ReadFrom(b []byte) (int, net.Addr, error) {
n, addr, err := c.PacketConn.ReadFrom(b)
n, addr, err := c.EnhancePacketConn.ReadFrom(b)
if err != nil {
return n, addr, err
}
@ -77,3 +78,20 @@ func (c *PacketConn) ReadFrom(b []byte) (int, net.Addr, error) {
copy(b, bb)
return len(bb), addr, err
}
func (c *PacketConn) WaitReadFrom() (data []byte, put func(), addr net.Addr, err error) {
data, put, addr, err = c.EnhancePacketConn.WaitReadFrom()
if err != nil {
return
}
data, err = Unpack(data[c.IVSize():], data, c)
if err != nil {
if put != nil {
put()
}
data = nil
put = nil
return
}
return
}

5
transport/ssr/protocol/auth_aes128_sha1.go
View file

@ -8,6 +8,7 @@ import (
"strconv"
"strings"
N "github.com/Dreamacro/clash/common/net"
"github.com/Dreamacro/clash/common/pool"
"github.com/Dreamacro/clash/log"
"github.com/Dreamacro/clash/transport/ssr/tools"
@ -82,13 +83,13 @@ func (a *authAES128) StreamConn(c net.Conn, iv []byte) net.Conn {
return &Conn{Conn: c, Protocol: p}
}
func (a *authAES128) PacketConn(c net.PacketConn) net.PacketConn {
func (a *authAES128) PacketConn(c N.EnhancePacketConn) N.EnhancePacketConn {
p := &authAES128{
Base: a.Base,
authAES128Function: a.authAES128Function,
userData: a.userData,
}
return &PacketConn{PacketConn: c, Protocol: p}
return &PacketConn{EnhancePacketConn: c, Protocol: p}
}
func (a *authAES128) Decode(dst, src *bytes.Buffer) error {

5
transport/ssr/protocol/auth_chain_a.go
View file

@ -11,6 +11,7 @@ import (
"strconv"
"strings"
N "github.com/Dreamacro/clash/common/net"
"github.com/Dreamacro/clash/common/pool"
"github.com/Dreamacro/clash/log"
"github.com/Dreamacro/clash/transport/shadowsocks/core"
@ -83,13 +84,13 @@ func (a *authChainA) StreamConn(c net.Conn, iv []byte) net.Conn {
return &Conn{Conn: c, Protocol: p}
}
func (a *authChainA) PacketConn(c net.PacketConn) net.PacketConn {
func (a *authChainA) PacketConn(c N.EnhancePacketConn) N.EnhancePacketConn {
p := &authChainA{
Base: a.Base,
salt: a.salt,
userData: a.userData,
}
return &PacketConn{PacketConn: c, Protocol: p}
return &PacketConn{EnhancePacketConn: c, Protocol: p}
}
func (a *authChainA) Decode(dst, src *bytes.Buffer) error {

3
transport/ssr/protocol/auth_sha1_v4.go
View file

@ -7,6 +7,7 @@ import (
"hash/crc32"
"net"
N "github.com/Dreamacro/clash/common/net"
"github.com/Dreamacro/clash/common/pool"
"github.com/Dreamacro/clash/transport/ssr/tools"
@ -35,7 +36,7 @@ func (a *authSHA1V4) StreamConn(c net.Conn, iv []byte) net.Conn {
return &Conn{Conn: c, Protocol: p}
}
func (a *authSHA1V4) PacketConn(c net.PacketConn) net.PacketConn {
func (a *authSHA1V4) PacketConn(c N.EnhancePacketConn) N.EnhancePacketConn {
return c
}

4
transport/ssr/protocol/origin.go
View file

@ -3,6 +3,8 @@ package protocol
import (
"bytes"
"net"
N "github.com/Dreamacro/clash/common/net"
)
type origin struct{}
@ -13,7 +15,7 @@ func newOrigin(b *Base) Protocol { return &origin{} }
func (o *origin) StreamConn(c net.Conn, iv []byte) net.Conn { return c }
func (o *origin) PacketConn(c net.PacketConn) net.PacketConn { return c }
func (o *origin) PacketConn(c N.EnhancePacketConn) N.EnhancePacketConn { return c }
func (o *origin) Decode(dst, src *bytes.Buffer) error {
dst.ReadFrom(src)

24
transport/ssr/protocol/packet.go
View file

@ -3,11 +3,12 @@ package protocol
import (
"net"
N "github.com/Dreamacro/clash/common/net"
"github.com/Dreamacro/clash/common/pool"
)
type PacketConn struct {
net.PacketConn
N.EnhancePacketConn
Protocol
}
@ -18,12 +19,12 @@ func (c *PacketConn) WriteTo(b []byte, addr net.Addr) (int, error) {
if err != nil {
return 0, err
}
_, err = c.PacketConn.WriteTo(buf.Bytes(), addr)
_, err = c.EnhancePacketConn.WriteTo(buf.Bytes(), addr)
return len(b), err
}
func (c *PacketConn) ReadFrom(b []byte) (int, net.Addr, error) {
n, addr, err := c.PacketConn.ReadFrom(b)
n, addr, err := c.EnhancePacketConn.ReadFrom(b)
if err != nil {
return n, addr, err
}
@ -34,3 +35,20 @@ func (c *PacketConn) ReadFrom(b []byte) (int, net.Addr, error) {
copy(b, decoded)
return len(decoded), addr, nil
}
func (c *PacketConn) WaitReadFrom() (data []byte, put func(), addr net.Addr, err error) {
data, put, addr, err = c.EnhancePacketConn.WaitReadFrom()
if err != nil {
return
}
data, err = c.DecodePacket(data)
if err != nil {
if put != nil {
put()
}
data = nil
put = nil
return
}
return
}

4
transport/ssr/protocol/protocol.go
View file

@ -6,6 +6,8 @@ import (
"fmt"
"net"
N "github.com/Dreamacro/clash/common/net"
"github.com/zhangyunhao116/fastrand"
)
@ -22,7 +24,7 @@ var (
type Protocol interface {
StreamConn(net.Conn, []byte) net.Conn
PacketConn(net.PacketConn) net.PacketConn
PacketConn(N.EnhancePacketConn) N.EnhancePacketConn
Decode(dst, src *bytes.Buffer) error
Encode(buf *bytes.Buffer, b []byte) error
DecodePacket([]byte) ([]byte, error)

6
transport/trojan/trojan.go
View file

@ -370,7 +370,9 @@ func (pc *PacketConn) WaitReadFrom() (data []byte, put func(), addr net.Addr, er
_, err = io.ReadFull(pc.Conn, data[:2+2]) // u16be length + CR LF
if err != nil {
if put != nil {
put()
}
return nil, nil, nil, err
}
length := binary.BigEndian.Uint16(data)
@ -379,11 +381,15 @@ func (pc *PacketConn) WaitReadFrom() (data []byte, put func(), addr net.Addr, er
data = data[:length]
_, err = io.ReadFull(pc.Conn, data)
if err != nil {
if put != nil {
put()
}
return nil, nil, nil, err
}
} else {
if put != nil {
put()
}
return nil, nil, addr, nil
}

1
transport/tuic/conn.go
View file

@ -205,7 +205,6 @@ func (q *quicStreamPacketConn) WaitReadFrom() (data []byte, put func(), addr net
return
}
data = packet.DATA
put = N.NilPut
addr = packet.ADDR.UDPAddr()
} else {
err = net.ErrClosed