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Crazy sekai overturns the small pond

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世界 2024-10-20 13:29:42 +08:00
parent 72db784fc7
commit 0f2447a95b
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GPG key ID: CD109927C34A63C4
15 changed files with 588 additions and 138 deletions
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11
common/bufio/addr_conn.go
View file

@ -9,19 +9,20 @@ import (
type AddrConn struct {
net.Conn
M.Metadata
Source M.Socksaddr
Destination M.Socksaddr
}
func (c *AddrConn) LocalAddr() net.Addr {
if c.Metadata.Destination.IsValid() {
return c.Metadata.Destination.TCPAddr()
if c.Destination.IsValid() {
return c.Destination.TCPAddr()
}
return c.Conn.LocalAddr()
}
func (c *AddrConn) RemoteAddr() net.Addr {
if c.Metadata.Source.IsValid() {
return c.Metadata.Source.TCPAddr()
if c.Source.IsValid() {
return c.Source.TCPAddr()
}
return c.Conn.RemoteAddr()
}

1
common/bufio/vectorised_unix.go
View file

@ -38,7 +38,6 @@ func (w *SyscallVectorisedWriter) WriteVectorised(buffers []*buf.Buffer) error {
var innerErr unix.Errno
err := w.rawConn.Write(func(fd uintptr) (done bool) {
//nolint:staticcheck
//goland:noinspection GoDeprecation
_, _, innerErr = unix.Syscall(unix.SYS_WRITEV, fd, uintptr(unsafe.Pointer(&iovecList[0])), uintptr(len(iovecList)))
return innerErr != unix.EAGAIN && innerErr != unix.EWOULDBLOCK
})

1
common/exceptions/error.go
View file

@ -12,6 +12,7 @@ import (
F "github.com/sagernet/sing/common/format"
)
// Deprecated: wtf is this?
type Handler interface {
NewError(ctx context.Context, err error)
}

1
common/exceptions/timeout.go
View file

@ -12,7 +12,6 @@ type TimeoutError interface {
func IsTimeout(err error) bool {
var netErr net.Error
if errors.As(err, &netErr) {
//goland:noinspection GoDeprecation
//nolint:staticcheck
return netErr.Temporary() && netErr.Timeout()
}

1
common/metadata/metadata.go
View file

@ -1,5 +1,6 @@
package metadata
// Deprecated: wtf is this?
type Metadata struct {
Protocol string
Source Socksaddr

51
common/network/conn.go
View file

@ -4,6 +4,7 @@ import (
"context"
"io"
"net"
"sync"
"time"
"github.com/sagernet/sing/common"
@ -70,8 +71,38 @@ type ExtendedConn interface {
net.Conn
}
type CloseHandlerFunc = func(it error)
func AppendClose(parent CloseHandlerFunc, onClose CloseHandlerFunc) CloseHandlerFunc {
if parent == nil {
return parent
} else if onClose == nil {
return onClose
}
return func(it error) {
onClose(it)
parent(it)
}
}
func OnceClose(onClose CloseHandlerFunc) CloseHandlerFunc {
var once sync.Once
return func(it error) {
once.Do(func() {
onClose(it)
})
}
}
// Deprecated: Use TCPConnectionHandlerEx instead.
type TCPConnectionHandler interface {
NewConnection(ctx context.Context, conn net.Conn, metadata M.Metadata) error
NewConnection(ctx context.Context, conn net.Conn,
//nolint:staticcheck
metadata M.Metadata) error
}
type TCPConnectionHandlerEx interface {
NewConnectionEx(ctx context.Context, conn net.Conn, source M.Socksaddr, destination M.Socksaddr, onClose CloseHandlerFunc)
}
type NetPacketConn interface {
@ -85,12 +116,26 @@ type BindPacketConn interface {
net.Conn
}
// Deprecated: Use UDPHandlerEx instead.
type UDPHandler interface {
NewPacket(ctx context.Context, conn PacketConn, buffer *buf.Buffer, metadata M.Metadata) error
NewPacket(ctx context.Context, conn PacketConn, buffer *buf.Buffer,
//nolint:staticcheck
metadata M.Metadata) error
}
type UDPHandlerEx interface {
NewPacket(ctx context.Context, conn PacketConn, buffer *buf.Buffer, source M.Socksaddr, destination M.Socksaddr) error
}
// Deprecated: Use UDPConnectionHandlerEx instead.
type UDPConnectionHandler interface {
NewPacketConnection(ctx context.Context, conn PacketConn, metadata M.Metadata) error
NewPacketConnection(ctx context.Context, conn PacketConn,
//nolint:staticcheck
metadata M.Metadata) error
}
type UDPConnectionHandlerEx interface {
NewPacketConnectionEx(ctx context.Context, conn PacketConn, source M.Socksaddr, destination M.Socksaddr, onClose CloseHandlerFunc)
}
type CachedReader interface {

65
common/network/handshake.go
View file

@ -1,6 +1,9 @@
package network
import (
"io"
"net"
"github.com/sagernet/sing/common"
E "github.com/sagernet/sing/common/exceptions"
)
@ -13,17 +16,71 @@ type HandshakeSuccess interface {
HandshakeSuccess() error
}
func ReportHandshakeFailure(conn any, err error) error {
if handshakeConn, isHandshakeConn := common.Cast[HandshakeFailure](conn); isHandshakeConn {
type ConnHandshakeSuccess interface {
ConnHandshakeSuccess(conn net.Conn) error
}
type PacketConnHandshakeSuccess interface {
PacketConnHandshakeSuccess(conn net.PacketConn) error
}
func ReportHandshakeFailure(reporter any, err error) error {
if handshakeConn, isHandshakeConn := common.Cast[HandshakeFailure](reporter); isHandshakeConn {
return E.Append(err, handshakeConn.HandshakeFailure(err), func(err error) error {
return E.Cause(err, "write handshake failure")
})
}
return nil
}
func CloseOnHandshakeFailure(reporter any, onClose CloseHandlerFunc, err error) error {
if err != nil {
if handshakeConn, isHandshakeConn := common.Cast[HandshakeFailure](reporter); isHandshakeConn {
err = E.Append(err, handshakeConn.HandshakeFailure(err), func(err error) error {
return E.Cause(err, "write handshake failure")
})
} else {
if tcpConn, isTCPConn := common.Cast[interface {
SetLinger(sec int) error
}](reporter); isTCPConn {
tcpConn.SetLinger(0)
}
if closer, isCloser := reporter.(io.Closer); isCloser {
err = E.Append(err, closer.Close(), func(err error) error {
return E.Cause(err, "close")
})
}
}
}
if onClose != nil {
onClose(err)
}
return err
}
func ReportHandshakeSuccess(conn any) error {
if handshakeConn, isHandshakeConn := common.Cast[HandshakeSuccess](conn); isHandshakeConn {
// Deprecated: use ReportConnHandshakeSuccess/ReportPacketConnHandshakeSuccess instead
func ReportHandshakeSuccess(reporter any) error {
if handshakeConn, isHandshakeConn := common.Cast[HandshakeSuccess](reporter); isHandshakeConn {
return handshakeConn.HandshakeSuccess()
}
return nil
}
func ReportConnHandshakeSuccess(reporter any, conn net.Conn) error {
if handshakeConn, isHandshakeConn := common.Cast[ConnHandshakeSuccess](reporter); isHandshakeConn {
return handshakeConn.ConnHandshakeSuccess(conn)
}
if handshakeConn, isHandshakeConn := common.Cast[HandshakeSuccess](reporter); isHandshakeConn {
return handshakeConn.HandshakeSuccess()
}
return nil
}
func ReportPacketConnHandshakeSuccess(reporter any, conn net.PacketConn) error {
if handshakeConn, isHandshakeConn := common.Cast[PacketConnHandshakeSuccess](reporter); isHandshakeConn {
return handshakeConn.PacketConnHandshakeSuccess(conn)
}
if handshakeConn, isHandshakeConn := common.Cast[HandshakeSuccess](reporter); isHandshakeConn {
return handshakeConn.HandshakeSuccess()
}
return nil

2
common/network/thread.go
View file

@ -11,6 +11,7 @@ type ThreadUnsafeWriter interface {
}
// Deprecated: Use ReadWaiter interface instead.
type ThreadSafeReader interface {
// Deprecated: Use ReadWaiter interface instead.
ReadBufferThreadSafe() (buffer *buf.Buffer, err error)
@ -18,7 +19,6 @@ type ThreadSafeReader interface {
// Deprecated: Use ReadWaiter interface instead.
type ThreadSafePacketReader interface {
// Deprecated: Use ReadWaiter interface instead.
ReadPacketThreadSafe() (buffer *buf.Buffer, addr M.Socksaddr, err error)
}

1
common/random/seed_go119.go
View file

@ -20,6 +20,5 @@ func InitializeSeed() {
func initializeSeed() {
var seed int64
common.Must(binary.Read(rand.Reader, binary.LittleEndian, &seed))
//goland:noinspection GoDeprecation
mRand.Seed(seed)
}

1
common/rw/varint.go
View file

@ -27,7 +27,6 @@ func ToByteReader(reader io.Reader) io.ByteReader {
// Deprecated: Use binary.ReadUvarint instead.
func ReadUVariant(reader io.Reader) (uint64, error) {
//goland:noinspection GoDeprecation
return binary.ReadUvarint(ToByteReader(reader))
}

57
common/udpnat/service.go
View file

@ -16,6 +16,9 @@ import (
"github.com/sagernet/sing/common/pipe"
)
// Deprecated: Use N.UDPConnectionHandler instead.
//
//nolint:staticcheck
type Handler interface {
N.UDPConnectionHandler
E.Handler
@ -24,10 +27,12 @@ type Handler interface {
type Service[K comparable] struct {
nat *cache.LruCache[K, *conn]
handler Handler
handlerEx N.UDPConnectionHandlerEx
}
// Deprecated: Use NewEx instead.
func New[K comparable](maxAge int64, handler Handler) *Service[K] {
return &Service[K]{
service := &Service[K]{
nat: cache.New(
cache.WithAge[K, *conn](maxAge),
cache.WithUpdateAgeOnGet[K, *conn](),
@ -37,11 +42,27 @@ func New[K comparable](maxAge int64, handler Handler) *Service[K] {
),
handler: handler,
}
return service
}
func NewEx[K comparable](maxAge int64, handler N.UDPConnectionHandlerEx) *Service[K] {
service := &Service[K]{
nat: cache.New(
cache.WithAge[K, *conn](maxAge),
cache.WithUpdateAgeOnGet[K, *conn](),
cache.WithEvict[K, *conn](func(key K, conn *conn) {
conn.Close()
}),
),
handlerEx: handler,
}
return service
}
func (s *Service[T]) WriteIsThreadUnsafe() {
}
// Deprecated: don't use
func (s *Service[T]) NewPacketDirect(ctx context.Context, key T, conn N.PacketConn, buffer *buf.Buffer, metadata M.Metadata) {
s.NewContextPacket(ctx, key, buffer, metadata, func(natConn N.PacketConn) (context.Context, N.PacketWriter) {
return ctx, &DirectBackWriter{conn, natConn}
@ -61,18 +82,30 @@ func (w *DirectBackWriter) Upstream() any {
return w.Source
}
// Deprecated: use NewPacketEx instead.
func (s *Service[T]) NewPacket(ctx context.Context, key T, buffer *buf.Buffer, metadata M.Metadata, init func(natConn N.PacketConn) N.PacketWriter) {
s.NewContextPacket(ctx, key, buffer, metadata, func(natConn N.PacketConn) (context.Context, N.PacketWriter) {
return ctx, init(natConn)
})
}
func (s *Service[T]) NewPacketEx(ctx context.Context, key T, buffer *buf.Buffer, source M.Socksaddr, destination M.Socksaddr, init func(natConn N.PacketConn) N.PacketWriter) {
s.NewContextPacketEx(ctx, key, buffer, source, destination, func(natConn N.PacketConn) (context.Context, N.PacketWriter) {
return ctx, init(natConn)
})
}
// Deprecated: Use NewPacketConnectionEx instead.
func (s *Service[T]) NewContextPacket(ctx context.Context, key T, buffer *buf.Buffer, metadata M.Metadata, init func(natConn N.PacketConn) (context.Context, N.PacketWriter)) {
s.NewContextPacketEx(ctx, key, buffer, metadata.Source, metadata.Destination, init)
}
func (s *Service[T]) NewContextPacketEx(ctx context.Context, key T, buffer *buf.Buffer, source M.Socksaddr, destination M.Socksaddr, init func(natConn N.PacketConn) (context.Context, N.PacketWriter)) {
c, loaded := s.nat.LoadOrStore(key, func() *conn {
c := &conn{
data: make(chan packet, 64),
localAddr: metadata.Source,
remoteAddr: metadata.Destination,
localAddr: source,
remoteAddr: destination,
readDeadline: pipe.MakeDeadline(),
}
c.ctx, c.cancel = common.ContextWithCancelCause(ctx)
@ -81,26 +114,36 @@ func (s *Service[T]) NewContextPacket(ctx context.Context, key T, buffer *buf.Bu
if !loaded {
ctx, c.source = init(c)
go func() {
err := s.handler.NewPacketConnection(ctx, c, metadata)
if s.handlerEx != nil {
s.handlerEx.NewPacketConnectionEx(ctx, c, source, destination, func(err error) {
s.nat.Delete(key)
})
} else {
//nolint:staticcheck
err := s.handler.NewPacketConnection(ctx, c, M.Metadata{
Source: source,
Destination: destination,
})
if err != nil {
s.handler.NewError(ctx, err)
}
c.Close()
s.nat.Delete(key)
}
}()
} else {
c.localAddr = metadata.Source
c.localAddr = source
}
if common.Done(c.ctx) {
s.nat.Delete(key)
if !common.Done(ctx) {
s.NewContextPacket(ctx, key, buffer, metadata, init)
s.NewContextPacketEx(ctx, key, buffer, source, destination, init)
}
return
}
c.data <- packet{
data: buffer,
destination: metadata.Destination,
destination: destination,
}
}

58
protocol/http/handshake.go
View file

@ -20,9 +20,18 @@ import (
"github.com/sagernet/sing/common/pipe"
)
type Handler = N.TCPConnectionHandler
// Deprecated: Use HandleConnectionEx instead.
func HandleConnection(ctx context.Context, conn net.Conn, reader *std_bufio.Reader, authenticator *auth.Authenticator,
//nolint:staticcheck
handler N.TCPConnectionHandler, metadata M.Metadata,
) error {
return HandleConnectionEx(ctx, conn, reader, authenticator, handler, nil, metadata.Source, nil)
}
func HandleConnection(ctx context.Context, conn net.Conn, reader *std_bufio.Reader, authenticator *auth.Authenticator, handler Handler, metadata M.Metadata) error {
func HandleConnectionEx(ctx context.Context, conn net.Conn, reader *std_bufio.Reader, authenticator *auth.Authenticator,
//nolint:staticcheck
handler N.TCPConnectionHandler, handlerEx N.TCPConnectionHandlerEx, source M.Socksaddr, onClose N.CloseHandlerFunc,
) error {
for {
request, err := ReadRequest(reader)
if err != nil {
@ -68,7 +77,7 @@ func HandleConnection(ctx context.Context, conn net.Conn, reader *std_bufio.Read
}
if sourceAddress := SourceAddress(request); sourceAddress.IsValid() {
metadata.Source = sourceAddress
source = sourceAddress
}
if request.Method == "CONNECT" {
@ -81,9 +90,6 @@ func HandleConnection(ctx context.Context, conn net.Conn, reader *std_bufio.Read
if err != nil {
return E.Cause(err, "write http response")
}
metadata.Protocol = "http"
metadata.Destination = destination
var requestConn net.Conn
if reader.Buffered() > 0 {
buffer := buf.NewSize(reader.Buffered())
@ -95,9 +101,30 @@ func HandleConnection(ctx context.Context, conn net.Conn, reader *std_bufio.Read
} else {
requestConn = conn
}
return handler.NewConnection(ctx, requestConn, metadata)
if handler != nil {
//nolint:staticcheck
return handler.NewConnection(ctx, requestConn, M.Metadata{Protocol: "http", Source: source, Destination: destination})
} else {
handlerEx.NewConnectionEx(ctx, requestConn, source, destination, onClose)
return nil
}
}
err = handleHTTPConnection(ctx, handler, handlerEx, conn, request, source)
if err != nil {
return err
}
}
}
func handleHTTPConnection(
ctx context.Context,
//nolint:staticcheck
handler N.TCPConnectionHandler,
handlerEx N.TCPConnectionHandlerEx,
conn net.Conn,
request *http.Request, source M.Socksaddr,
) error {
keepAlive := !(request.ProtoMajor == 1 && request.ProtoMinor == 0) && strings.TrimSpace(strings.ToLower(request.Header.Get("Proxy-Connection"))) == "keep-alive"
request.RequestURI = ""
@ -119,16 +146,22 @@ func HandleConnection(ctx context.Context, conn net.Conn, reader *std_bufio.Read
Transport: &http.Transport{
DisableCompression: true,
DialContext: func(ctx context.Context, network, address string) (net.Conn, error) {
metadata.Destination = M.ParseSocksaddr(address)
metadata.Protocol = "http"
input, output := pipe.Pipe()
if handler != nil {
go func() {
hErr := handler.NewConnection(ctx, output, metadata)
//nolint:staticcheck
hErr := handler.NewConnection(ctx, output, M.Metadata{Protocol: "http", Source: source, Destination: M.ParseSocksaddr(address)})
if hErr != nil {
innerErr.Store(hErr)
common.Close(input, output)
}
}()
} else {
go handlerEx.NewConnectionEx(ctx, output, source, M.ParseSocksaddr(address), func(it error) {
innerErr.Store(it)
common.Close(input, output)
})
}
return input, nil
},
},
@ -136,6 +169,8 @@ func HandleConnection(ctx context.Context, conn net.Conn, reader *std_bufio.Read
return http.ErrUseLastResponse
},
}
defer httpClient.CloseIdleConnections()
requestCtx, cancel := context.WithCancel(ctx)
response, err := httpClient.Do(request.WithContext(requestCtx))
if err != nil {
@ -163,7 +198,8 @@ func HandleConnection(ctx context.Context, conn net.Conn, reader *std_bufio.Read
if !keepAlive {
return conn.Close()
}
}
return nil
}
func removeHopByHopHeaders(header http.Header) {

71
protocol/socks/handshake.go
View file

@ -19,11 +19,19 @@ import (
"github.com/sagernet/sing/protocol/socks/socks5"
)
// Deprecated: Use HandlerEx instead.
//
//nolint:staticcheck
type Handler interface {
N.TCPConnectionHandler
N.UDPConnectionHandler
}
type HandlerEx interface {
N.TCPConnectionHandlerEx
N.UDPConnectionHandlerEx
}
func ClientHandshake4(conn io.ReadWriter, command byte, destination M.Socksaddr, username string) (socks4.Response, error) {
err := socks4.WriteRequest(conn, socks4.Request{
Command: command,
@ -96,18 +104,33 @@ func ClientHandshake5(conn io.ReadWriter, command byte, destination M.Socksaddr,
return response, err
}
// Deprecated: use HandleConnectionEx instead.
func HandleConnection(ctx context.Context, conn net.Conn, authenticator *auth.Authenticator, handler Handler, metadata M.Metadata) error {
return HandleConnection0(ctx, conn, std_bufio.NewReader(conn), authenticator, handler, metadata)
}
// Deprecated: Use HandleConnectionEx instead.
func HandleConnection0(ctx context.Context, conn net.Conn, reader *std_bufio.Reader, authenticator *auth.Authenticator, handler Handler, metadata M.Metadata) error {
return HandleConnectionEx(ctx, conn, reader, authenticator, handler, nil, metadata.Source, metadata.Destination, nil)
}
func HandleConnectionEx(
ctx context.Context, conn net.Conn, reader *std_bufio.Reader,
authenticator *auth.Authenticator,
//nolint:staticcheck
handler Handler,
handlerEx HandlerEx,
source M.Socksaddr, destination M.Socksaddr,
onClose N.CloseHandlerFunc,
) error {
version, err := reader.ReadByte()
if err != nil {
return err
}
switch version {
case socks4.Version:
request, err := socks4.ReadRequest0(reader)
var request socks4.Request
request, err = socks4.ReadRequest0(reader)
if err != nil {
return err
}
@ -116,13 +139,16 @@ func HandleConnection0(ctx context.Context, conn net.Conn, reader *std_bufio.Rea
if authenticator != nil && !authenticator.Verify(request.Username, "") {
err = socks4.WriteResponse(conn, socks4.Response{
ReplyCode: socks4.ReplyCodeRejectedOrFailed,
Destination: request.Destination,
})
if err != nil {
return err
}
return E.New("socks4: authentication failed, username=", request.Username)
}
destination = request.Destination
if handlerEx != nil {
handlerEx.NewConnectionEx(auth.ContextWithUser(ctx, request.Username), NewLazyConn(conn, version), source, destination, onClose)
} else {
err = socks4.WriteResponse(conn, socks4.Response{
ReplyCode: socks4.ReplyCodeGranted,
Destination: M.SocksaddrFromNet(conn.LocalAddr()),
@ -130,13 +156,13 @@ func HandleConnection0(ctx context.Context, conn net.Conn, reader *std_bufio.Rea
if err != nil {
return err
}
metadata.Protocol = "socks4"
metadata.Destination = request.Destination
return handler.NewConnection(auth.ContextWithUser(ctx, request.Username), conn, metadata)
//nolint:staticcheck
return handler.NewConnection(auth.ContextWithUser(ctx, request.Username), conn, M.Metadata{Protocol: "socks4", Source: source, Destination: destination})
}
return nil
default:
err = socks4.WriteResponse(conn, socks4.Response{
ReplyCode: socks4.ReplyCodeRejectedOrFailed,
Destination: request.Destination,
})
if err != nil {
return err
@ -144,7 +170,8 @@ func HandleConnection0(ctx context.Context, conn net.Conn, reader *std_bufio.Rea
return E.New("socks4: unsupported command ", request.Command)
}
case socks5.Version:
authRequest, err := socks5.ReadAuthRequest0(reader)
var authRequest socks5.AuthRequest
authRequest, err = socks5.ReadAuthRequest0(reader)
if err != nil {
return err
}
@ -169,7 +196,8 @@ func HandleConnection0(ctx context.Context, conn net.Conn, reader *std_bufio.Rea
return err
}
if authMethod == socks5.AuthTypeUsernamePassword {
usernamePasswordAuthRequest, err := socks5.ReadUsernamePasswordAuthRequest(reader)
var usernamePasswordAuthRequest socks5.UsernamePasswordAuthRequest
usernamePasswordAuthRequest, err = socks5.ReadUsernamePasswordAuthRequest(reader)
if err != nil {
return err
}
@ -188,12 +216,18 @@ func HandleConnection0(ctx context.Context, conn net.Conn, reader *std_bufio.Rea
return E.New("socks5: authentication failed, username=", usernamePasswordAuthRequest.Username, ", password=", usernamePasswordAuthRequest.Password)
}
}
request, err := socks5.ReadRequest(reader)
var request socks5.Request
request, err = socks5.ReadRequest(reader)
if err != nil {
return err
}
switch request.Command {
case socks5.CommandConnect:
destination = request.Destination
if handlerEx != nil {
handlerEx.NewConnectionEx(ctx, NewLazyConn(conn, version), source, destination, onClose)
return nil
} else {
err = socks5.WriteResponse(conn, socks5.Response{
ReplyCode: socks5.ReplyCodeSuccess,
Bind: M.SocksaddrFromNet(conn.LocalAddr()),
@ -201,15 +235,16 @@ func HandleConnection0(ctx context.Context, conn net.Conn, reader *std_bufio.Rea
if err != nil {
return err
}
metadata.Protocol = "socks5"
metadata.Destination = request.Destination
return handler.NewConnection(ctx, conn, metadata)
//nolint:staticcheck
return handler.NewConnection(ctx, conn, M.Metadata{Protocol: "socks5", Source: source, Destination: destination})
}
case socks5.CommandUDPAssociate:
var udpConn *net.UDPConn
udpConn, err = net.ListenUDP(M.NetworkFromNetAddr("udp", M.AddrFromNet(conn.LocalAddr())), net.UDPAddrFromAddrPort(netip.AddrPortFrom(M.AddrFromNet(conn.LocalAddr()), 0)))
if err != nil {
return err
}
if handlerEx == nil {
defer udpConn.Close()
err = socks5.WriteResponse(conn, socks5.Response{
ReplyCode: socks5.ReplyCodeSuccess,
@ -218,19 +253,23 @@ func HandleConnection0(ctx context.Context, conn net.Conn, reader *std_bufio.Rea
if err != nil {
return err
}
metadata.Protocol = "socks5"
metadata.Destination = request.Destination
destination = request.Destination
associatePacketConn := NewAssociatePacketConn(bufio.NewServerPacketConn(udpConn), destination, conn)
var innerError error
done := make(chan struct{})
associatePacketConn := NewAssociatePacketConn(bufio.NewServerPacketConn(udpConn), request.Destination, conn)
go func() {
innerError = handler.NewPacketConnection(ctx, associatePacketConn, metadata)
//nolint:staticcheck
innerError = handler.NewPacketConnection(ctx, associatePacketConn, M.Metadata{Protocol: "socks5", Source: source, Destination: destination})
close(done)
}()
err = common.Error(io.Copy(io.Discard, conn))
associatePacketConn.Close()
<-done
return E.Errors(innerError, err)
} else {
handlerEx.NewPacketConnectionEx(ctx, NewLazyAssociatePacketConn(bufio.NewServerPacketConn(udpConn), destination, conn), source, destination, onClose)
return nil
}
default:
err = socks5.WriteResponse(conn, socks5.Response{
ReplyCode: socks5.ReplyCodeUnsupported,

215
protocol/socks/lazy.go Normal file
View file

@ -0,0 +1,215 @@
package socks
import (
"net"
"github.com/sagernet/sing/common/buf"
"github.com/sagernet/sing/common/bufio"
M "github.com/sagernet/sing/common/metadata"
"github.com/sagernet/sing/protocol/socks/socks4"
"github.com/sagernet/sing/protocol/socks/socks5"
)
type LazyConn struct {
net.Conn
socksVersion byte
responseWritten bool
}
func NewLazyConn(conn net.Conn, socksVersion byte) *LazyConn {
return &LazyConn{
Conn: conn,
socksVersion: socksVersion,
}
}
func (c *LazyConn) ConnHandshakeSuccess(conn net.Conn) error {
if c.responseWritten {
return nil
}
defer func() {
c.responseWritten = true
}()
switch c.socksVersion {
case socks4.Version:
return socks4.WriteResponse(c.Conn, socks4.Response{
ReplyCode: socks4.ReplyCodeGranted,
Destination: M.SocksaddrFromNet(conn.LocalAddr()),
})
case socks5.Version:
return socks5.WriteResponse(conn, socks5.Response{
ReplyCode: socks5.ReplyCodeSuccess,
Bind: M.SocksaddrFromNet(conn.LocalAddr()),
})
default:
panic("unknown socks version")
}
}
func (c *LazyConn) HandshakeFailure(err error) error {
if c.responseWritten {
return nil
}
defer func() {
c.responseWritten = true
}()
switch c.socksVersion {
case socks4.Version:
return socks4.WriteResponse(c.Conn, socks4.Response{
ReplyCode: socks4.ReplyCodeRejectedOrFailed,
})
case socks5.Version:
return socks5.WriteResponse(c.Conn, socks5.Response{
ReplyCode: socks5.ReplyCodeForError(err),
})
default:
panic("unknown socks version")
}
}
func (c *LazyConn) Read(p []byte) (n int, err error) {
if !c.responseWritten {
err = c.ConnHandshakeSuccess(c.Conn)
if err != nil {
return
}
}
return c.Conn.Read(p)
}
func (c *LazyConn) Write(p []byte) (n int, err error) {
if !c.responseWritten {
err = c.ConnHandshakeSuccess(c.Conn)
if err != nil {
return
}
}
return c.Conn.Write(p)
}
func (c *LazyConn) ReaderReplaceable() bool {
return c.responseWritten
}
func (c *LazyConn) WriterReplaceable() bool {
return c.responseWritten
}
func (c *LazyConn) Upstream() any {
return c.Conn
}
type LazyAssociatePacketConn struct {
AssociatePacketConn
responseWritten bool
}
func NewLazyAssociatePacketConn(conn net.Conn, remoteAddr M.Socksaddr, underlying net.Conn) *LazyAssociatePacketConn {
return &LazyAssociatePacketConn{
AssociatePacketConn: AssociatePacketConn{
AbstractConn: conn,
conn: bufio.NewExtendedConn(conn),
remoteAddr: remoteAddr,
underlying: underlying,
},
}
}
func (c *LazyAssociatePacketConn) HandshakeSuccess() error {
if c.responseWritten {
return nil
}
defer func() {
c.responseWritten = true
}()
return socks5.WriteResponse(c.underlying, socks5.Response{
ReplyCode: socks5.ReplyCodeSuccess,
Bind: M.SocksaddrFromNet(c.conn.LocalAddr()),
})
}
func (c *LazyAssociatePacketConn) HandshakeFailure(err error) error {
if c.responseWritten {
return nil
}
defer func() {
c.responseWritten = true
c.conn.Close()
c.underlying.Close()
}()
return socks5.WriteResponse(c.underlying, socks5.Response{
ReplyCode: socks5.ReplyCodeForError(err),
})
}
func (c *LazyAssociatePacketConn) ReadFrom(p []byte) (n int, addr net.Addr, err error) {
if !c.responseWritten {
err = c.HandshakeSuccess()
if err != nil {
return
}
}
return c.AssociatePacketConn.ReadFrom(p)
}
func (c *LazyAssociatePacketConn) WriteTo(p []byte, addr net.Addr) (n int, err error) {
if !c.responseWritten {
err = c.HandshakeSuccess()
if err != nil {
return
}
}
return c.AssociatePacketConn.WriteTo(p, addr)
}
func (c *LazyAssociatePacketConn) ReadPacket(buffer *buf.Buffer) (destination M.Socksaddr, err error) {
if !c.responseWritten {
err = c.HandshakeSuccess()
if err != nil {
return
}
}
return c.AssociatePacketConn.ReadPacket(buffer)
}
func (c *LazyAssociatePacketConn) WritePacket(buffer *buf.Buffer, destination M.Socksaddr) error {
if !c.responseWritten {
err := c.HandshakeSuccess()
if err != nil {
return err
}
}
return c.AssociatePacketConn.WritePacket(buffer, destination)
}
func (c *LazyAssociatePacketConn) Read(p []byte) (n int, err error) {
if !c.responseWritten {
err = c.HandshakeSuccess()
if err != nil {
return
}
}
return c.AssociatePacketConn.Read(p)
}
func (c *LazyAssociatePacketConn) Write(p []byte) (n int, err error) {
if !c.responseWritten {
err = c.HandshakeSuccess()
if err != nil {
return
}
}
return c.AssociatePacketConn.Write(p)
}
func (c *LazyAssociatePacketConn) ReaderReplaceable() bool {
return c.responseWritten
}
func (c *LazyAssociatePacketConn) WriterReplaceable() bool {
return c.responseWritten
}
func (c *LazyAssociatePacketConn) Upstream() any {
return c.underlying
}

16
protocol/socks/socks5/protocol.go
View file

@ -1,8 +1,10 @@
package socks5
import (
"errors"
"io"
"net/netip"
"syscall"
"github.com/sagernet/sing/common"
"github.com/sagernet/sing/common/buf"
@ -37,6 +39,20 @@ const (
ReplyCodeAddressTypeUnsupported byte = 8
)
func ReplyCodeForError(err error) byte {
if errors.Is(err, syscall.ENETUNREACH) {
return ReplyCodeNetworkUnreachable
} else if errors.Is(err, syscall.EHOSTUNREACH) {
return ReplyCodeHostUnreachable
} else if errors.Is(err, syscall.ECONNREFUSED) {
return ReplyCodeConnectionRefused
} else if errors.Is(err, syscall.EPERM) {
return ReplyCodeNotAllowed
} else {
return ReplyCodeFailure
}
}
// +----+----------+----------+
// |VER | NMETHODS | METHODS |
// +----+----------+----------+