Init commit

adapter/direct/inbound.go

@@ -0,0 +1,94 @@
+package direct
+
+import (
+	"context"
+	"net"
+	"net/netip"
+
+	"github.com/sagernet/sing-box/adapter"
+	"github.com/sagernet/sing-box/common/udpnat"
+	"github.com/sagernet/sing-box/config"
+	C "github.com/sagernet/sing-box/constant"
+	"github.com/sagernet/sing-box/log"
+	"github.com/sagernet/sing/common/buf"
+	M "github.com/sagernet/sing/common/metadata"
+	N "github.com/sagernet/sing/common/network"
+)
+
+var _ adapter.InboundHandler = (*Inbound)(nil)
+
+type Inbound struct {
+	router              adapter.Router
+	logger              log.Logger
+	network             []string
+	udpNat              *udpnat.Service[netip.AddrPort]
+	overrideOption      int
+	overrideDestination M.Socksaddr
+}
+
+func NewInbound(router adapter.Router, logger log.Logger, options *config.DirectInboundOptions) (inbound *Inbound) {
+	inbound = &Inbound{
+		router:  router,
+		logger:  logger,
+		network: options.Network.Build(),
+	}
+	if options.OverrideAddress != "" && options.OverridePort != 0 {
+		inbound.overrideOption = 1
+		inbound.overrideDestination = M.ParseSocksaddrHostPort(options.OverrideAddress, options.OverridePort)
+	} else if options.OverrideAddress != "" {
+		inbound.overrideOption = 2
+		inbound.overrideDestination = M.ParseSocksaddrHostPort(options.OverrideAddress, options.OverridePort)
+	} else if options.OverridePort != 0 {
+		inbound.overrideOption = 3
+		inbound.overrideDestination = M.Socksaddr{Port: options.OverridePort}
+	}
+	inbound.udpNat = udpnat.New[netip.AddrPort](options.UDPTimeout, inbound)
+	return
+}
+
+func (d *Inbound) Type() string {
+	return C.TypeDirect
+}
+
+func (d *Inbound) Network() []string {
+	return d.network
+}
+
+func (d *Inbound) NewConnection(ctx context.Context, conn net.Conn, metadata adapter.InboundContext) error {
+	switch d.overrideOption {
+	case 0:
+		metadata.Destination = d.overrideDestination
+	case 1:
+		destination := d.overrideDestination
+		destination.Port = metadata.Destination.Port
+		metadata.Destination = destination
+	case 2:
+		metadata.Destination.Port = d.overrideDestination.Port
+	}
+	d.logger.WithContext(ctx).Info("inbound connection to ", metadata.Destination)
+	return d.router.RouteConnection(ctx, conn, metadata)
+}
+
+func (d *Inbound) NewPacket(ctx context.Context, conn N.PacketConn, buffer *buf.Buffer, metadata adapter.InboundContext) error {
+	switch d.overrideOption {
+	case 0:
+		metadata.Destination = d.overrideDestination
+	case 1:
+		destination := d.overrideDestination
+		destination.Port = metadata.Destination.Port
+		metadata.Destination = destination
+	case 2:
+		metadata.Destination.Port = d.overrideDestination.Port
+	}
+	d.udpNat.NewPacketDirect(ctx, metadata.Source, conn, buffer, metadata)
+	return nil
+}
+
+func (d *Inbound) NewPacketConnection(ctx context.Context, conn N.PacketConn, metadata adapter.InboundContext) error {
+	d.logger.WithContext(ctx).Info("inbound packet connection to ", metadata.Destination)
+	return d.router.RoutePacketConnection(ctx, conn, metadata)
+}
+
+func (d *Inbound) NewError(ctx context.Context, err error) {
+	d.logger.WithContext(ctx).Error(err)
+}

adapter/direct/outbound.go

@@ -0,0 +1,93 @@
+package direct
+
+import (
+	"context"
+	"net"
+
+	"github.com/sagernet/sing-box/adapter"
+	"github.com/sagernet/sing-box/common/dialer"
+	"github.com/sagernet/sing-box/config"
+	C "github.com/sagernet/sing-box/constant"
+	"github.com/sagernet/sing-box/log"
+	"github.com/sagernet/sing/common/bufio"
+	M "github.com/sagernet/sing/common/metadata"
+	N "github.com/sagernet/sing/common/network"
+)
+
+var _ adapter.Outbound = (*Outbound)(nil)
+
+type Outbound struct {
+	tag                 string
+	logger              log.Logger
+	dialer              N.Dialer
+	overrideOption      int
+	overrideDestination M.Socksaddr
+}
+
+func NewOutbound(tag string, router adapter.Router, logger log.Logger, options *config.DirectOutboundOptions) (outbound *Outbound) {
+	outbound = &Outbound{
+		tag:    tag,
+		logger: logger,
+		dialer: dialer.NewDialer(router, options.DialerOptions),
+	}
+	if options.OverrideAddress != "" && options.OverridePort != 0 {
+		outbound.overrideOption = 1
+		outbound.overrideDestination = M.ParseSocksaddrHostPort(options.OverrideAddress, options.OverridePort)
+	} else if options.OverrideAddress != "" {
+		outbound.overrideOption = 2
+		outbound.overrideDestination = M.ParseSocksaddrHostPort(options.OverrideAddress, options.OverridePort)
+	} else if options.OverridePort != 0 {
+		outbound.overrideOption = 3
+		outbound.overrideDestination = M.Socksaddr{Port: options.OverridePort}
+	}
+	return
+}
+
+func (d *Outbound) Type() string {
+	return C.TypeDirect
+}
+
+func (d *Outbound) Tag() string {
+	return d.tag
+}
+
+func (d *Outbound) DialContext(ctx context.Context, network string, destination M.Socksaddr) (net.Conn, error) {
+	switch d.overrideOption {
+	case 0:
+		destination = d.overrideDestination
+	case 1:
+		newDestination := d.overrideDestination
+		newDestination.Port = destination.Port
+		destination = newDestination
+	case 2:
+		destination.Port = d.overrideDestination.Port
+	}
+	switch network {
+	case C.NetworkTCP:
+		d.logger.WithContext(ctx).Debug("outbound connection to ", destination)
+	case C.NetworkUDP:
+		d.logger.WithContext(ctx).Debug("outbound packet connection to ", destination)
+	}
+	return d.dialer.DialContext(ctx, network, destination)
+}
+
+func (d *Outbound) ListenPacket(ctx context.Context) (net.PacketConn, error) {
+	d.logger.WithContext(ctx).Debug("outbound packet connection")
+	return d.dialer.ListenPacket(ctx)
+}
+
+func (d *Outbound) NewConnection(ctx context.Context, conn net.Conn, destination M.Socksaddr) error {
+	outConn, err := d.DialContext(ctx, "tcp", destination)
+	if err != nil {
+		return err
+	}
+	return bufio.CopyConn(ctx, conn, outConn)
+}
+
+func (d *Outbound) NewPacketConnection(ctx context.Context, conn N.PacketConn, destination M.Socksaddr) error {
+	outConn, err := d.ListenPacket(ctx)
+	if err != nil {
+		return err
+	}
+	return bufio.CopyPacketConn(ctx, conn, bufio.NewPacketConn(outConn))
+}

adapter/http/inbound.go

@@ -0,0 +1,67 @@
+package http
+
+import (
+	std_bufio "bufio"
+	"context"
+	"net"
+	"os"
+
+	"github.com/sagernet/sing-box/adapter"
+	"github.com/sagernet/sing-box/config"
+	C "github.com/sagernet/sing-box/constant"
+	"github.com/sagernet/sing-box/log"
+	"github.com/sagernet/sing/common"
+	"github.com/sagernet/sing/common/auth"
+	"github.com/sagernet/sing/common/buf"
+	M "github.com/sagernet/sing/common/metadata"
+	N "github.com/sagernet/sing/common/network"
+	"github.com/sagernet/sing/protocol/http"
+)
+
+var _ adapter.InboundHandler = (*Inbound)(nil)
+
+type Inbound struct {
+	router        adapter.Router
+	logger        log.Logger
+	authenticator auth.Authenticator
+}
+
+func NewInbound(router adapter.Router, logger log.Logger, options *config.SimpleInboundOptions) *Inbound {
+	return &Inbound{
+		router:        router,
+		logger:        logger,
+		authenticator: auth.NewAuthenticator(options.Users),
+	}
+}
+
+func (i *Inbound) Type() string {
+	return C.TypeHTTP
+}
+
+func (i *Inbound) Network() []string {
+	return []string{C.NetworkTCP}
+}
+
+func (i *Inbound) NewConnection(ctx context.Context, conn net.Conn, metadata adapter.InboundContext) error {
+	ctx = &inboundContext{ctx, metadata}
+	return http.HandleConnection(ctx, conn, std_bufio.NewReader(conn), i.authenticator, (*inboundHandler)(i), M.Metadata{})
+}
+
+func (i *Inbound) NewPacket(ctx context.Context, conn N.PacketConn, buffer *buf.Buffer, metadata adapter.InboundContext) error {
+	return os.ErrInvalid
+}
+
+type inboundContext struct {
+	context.Context
+	metadata adapter.InboundContext
+}
+
+type inboundHandler Inbound
+
+func (h *inboundHandler) NewConnection(ctx context.Context, conn net.Conn, metadata M.Metadata) error {
+	inboundCtx, _ := common.Cast[*inboundContext](ctx)
+	ctx = inboundCtx.Context
+	h.logger.WithContext(ctx).Info("inbound connection to ", metadata.Destination)
+	inboundCtx.metadata.Destination = metadata.Destination
+	return h.router.RouteConnection(ctx, conn, inboundCtx.metadata)
+}

adapter/inbound.go

@@ -0,0 +1,7 @@
+package adapter
+
+type Inbound interface {
+	Service
+	Type() string
+	Tag() string
+}

adapter/inbound_context.go

@@ -0,0 +1,16 @@
+package adapter
+
+import (
+	"net/netip"
+
+	M "github.com/sagernet/sing/common/metadata"
+)
+
+type InboundContext struct {
+	Source      netip.AddrPort
+	Destination M.Socksaddr
+	Inbound     string
+	Network     string
+	Protocol    string
+	Domain      string
+}

adapter/inbound_default.go

@@ -0,0 +1,291 @@
+package adapter
+
+import (
+	"context"
+	"net"
+	"net/netip"
+	"os"
+	"sync"
+	"time"
+
+	"github.com/database64128/tfo-go"
+	C "github.com/sagernet/sing-box/constant"
+	"github.com/sagernet/sing-box/log"
+	"github.com/sagernet/sing/common"
+	"github.com/sagernet/sing/common/buf"
+	E "github.com/sagernet/sing/common/exceptions"
+	M "github.com/sagernet/sing/common/metadata"
+	N "github.com/sagernet/sing/common/network"
+)
+
+type InboundHandler interface {
+	Type() string
+	Network() []string
+	NewConnection(ctx context.Context, conn net.Conn, metadata InboundContext) error
+	NewPacket(ctx context.Context, conn N.PacketConn, buffer *buf.Buffer, metadata InboundContext) error
+}
+
+var _ Inbound = (*DefaultInboundService)(nil)
+
+type DefaultInboundService struct {
+	ctx         context.Context
+	logger      log.Logger
+	tag         string
+	listen      netip.AddrPort
+	listenerTFO bool
+	handler     InboundHandler
+	tcpListener *net.TCPListener
+	udpConn     *net.UDPConn
+	forceAddr6  bool
+	access      sync.RWMutex
+	closed      chan struct{}
+	outbound    chan *defaultInboundUDPServiceOutboundPacket
+}
+
+func NewDefaultInboundService(ctx context.Context, tag string, logger log.Logger, listen netip.AddrPort, listenerTFO bool, handler InboundHandler) *DefaultInboundService {
+	return &DefaultInboundService{
+		ctx:         ctx,
+		logger:      logger,
+		tag:         tag,
+		listen:      listen,
+		listenerTFO: listenerTFO,
+		handler:     handler,
+		closed:      make(chan struct{}),
+		outbound:    make(chan *defaultInboundUDPServiceOutboundPacket),
+	}
+}
+
+func (s *DefaultInboundService) Type() string {
+	return s.handler.Type()
+}
+
+func (s *DefaultInboundService) Tag() string {
+	return s.tag
+}
+
+func (s *DefaultInboundService) Start() error {
+	var listenAddr net.Addr
+	if common.Contains(s.handler.Network(), C.NetworkTCP) {
+		var tcpListener *net.TCPListener
+		var err error
+		if !s.listenerTFO {
+			tcpListener, err = net.ListenTCP(M.NetworkFromNetAddr("tcp", s.listen.Addr()), M.SocksaddrFromNetIP(s.listen).TCPAddr())
+		} else {
+			tcpListener, err = tfo.ListenTCP(M.NetworkFromNetAddr("tcp", s.listen.Addr()), M.SocksaddrFromNetIP(s.listen).TCPAddr())
+		}
+		if err != nil {
+			return err
+		}
+		s.tcpListener = tcpListener
+		go s.loopTCPIn()
+		listenAddr = tcpListener.Addr()
+	}
+	if common.Contains(s.handler.Network(), C.NetworkUDP) {
+		udpConn, err := net.ListenUDP(M.NetworkFromNetAddr("udp", s.listen.Addr()), M.SocksaddrFromNetIP(s.listen).UDPAddr())
+		if err != nil {
+			return err
+		}
+		s.udpConn = udpConn
+		s.forceAddr6 = M.SocksaddrFromNet(udpConn.LocalAddr()).Addr.Is6()
+		if _, threadUnsafeHandler := common.Cast[N.ThreadUnsafeWriter](s.handler); !threadUnsafeHandler {
+			go s.loopUDPIn()
+		} else {
+			go s.loopUDPInThreadSafe()
+		}
+		go s.loopUDPOut()
+		if listenAddr == nil {
+			listenAddr = udpConn.LocalAddr()
+		}
+	}
+	s.logger.Info("server started at ", listenAddr)
+	return nil
+}
+
+func (s *DefaultInboundService) Close() error {
+	return common.Close(
+		common.PtrOrNil(s.tcpListener),
+		common.PtrOrNil(s.udpConn),
+	)
+}
+
+func (s *DefaultInboundService) Upstream() any {
+	return s.handler
+}
+
+func (s *DefaultInboundService) loopTCPIn() {
+	tcpListener := s.tcpListener
+	for {
+		conn, err := tcpListener.Accept()
+		if err != nil {
+			return
+		}
+		var metadata InboundContext
+		metadata.Inbound = s.tag
+		metadata.Source = M.AddrPortFromNet(conn.RemoteAddr())
+		go func() {
+			metadata.Network = "tcp"
+			ctx := log.ContextWithID(s.ctx)
+			s.logger.WithContext(ctx).Info("inbound connection from ", conn.RemoteAddr())
+			hErr := s.handler.NewConnection(ctx, conn, metadata)
+			if hErr != nil {
+				s.newContextError(ctx, E.Cause(hErr, "process connection from ", conn.RemoteAddr()))
+			}
+		}()
+	}
+}
+
+func (s *DefaultInboundService) loopUDPIn() {
+	defer close(s.closed)
+	_buffer := buf.StackNewPacket()
+	defer common.KeepAlive(_buffer)
+	buffer := common.Dup(_buffer)
+	defer buffer.Release()
+	buffer.IncRef()
+	defer buffer.DecRef()
+	packetService := (*defaultInboundUDPService)(s)
+	var metadata InboundContext
+	metadata.Inbound = s.tag
+	metadata.Network = "udp"
+	for {
+		buffer.Reset()
+		n, addr, err := s.udpConn.ReadFromUDPAddrPort(buffer.FreeBytes())
+		if err != nil {
+			return
+		}
+		buffer.Truncate(n)
+		metadata.Source = addr
+		err = s.handler.NewPacket(s.ctx, packetService, buffer, metadata)
+		if err != nil {
+			s.newError(E.Cause(err, "process packet from ", addr))
+		}
+	}
+}
+
+func (s *DefaultInboundService) loopUDPInThreadSafe() {
+	defer close(s.closed)
+	packetService := (*defaultInboundUDPService)(s)
+	var metadata InboundContext
+	metadata.Inbound = s.tag
+	metadata.Network = "udp"
+	for {
+		buffer := buf.NewPacket()
+		n, addr, err := s.udpConn.ReadFromUDPAddrPort(buffer.FreeBytes())
+		if err != nil {
+			return
+		}
+		buffer.Truncate(n)
+		metadata.Source = addr
+		err = s.handler.NewPacket(s.ctx, packetService, buffer, metadata)
+		if err != nil {
+			buffer.Release()
+			s.newError(E.Cause(err, "process packet from ", addr))
+		}
+	}
+}
+
+func (s *DefaultInboundService) loopUDPOut() {
+	for {
+		select {
+		case packet := <-s.outbound:
+			err := s.writePacket(packet.buffer, packet.destination)
+			if err != nil && !E.IsClosed(err) {
+				s.newError(E.New("write back udp: ", err))
+			}
+			continue
+		case <-s.closed:
+		}
+		for {
+			select {
+			case packet := <-s.outbound:
+				packet.buffer.Release()
+			default:
+				return
+			}
+		}
+	}
+}
+
+func (s *DefaultInboundService) newError(err error) {
+	s.logger.Warn(err)
+}
+
+func (s *DefaultInboundService) newContextError(ctx context.Context, err error) {
+	common.Close(err)
+	if E.IsClosed(err) {
+		s.logger.WithContext(ctx).Debug("connection closed")
+		return
+	}
+	s.logger.Error(err)
+}
+
+func (s *DefaultInboundService) writePacket(buffer *buf.Buffer, destination M.Socksaddr) error {
+	defer buffer.Release()
+	if destination.Family().IsFqdn() {
+		udpAddr, err := net.ResolveUDPAddr("udp", destination.String())
+		if err != nil {
+			return err
+		}
+		return common.Error(s.udpConn.WriteTo(buffer.Bytes(), udpAddr))
+	}
+	if s.forceAddr6 && destination.Addr.Is4() {
+		destination.Addr = netip.AddrFrom16(destination.Addr.As16())
+	}
+	return common.Error(s.udpConn.WriteToUDPAddrPort(buffer.Bytes(), destination.AddrPort()))
+}
+
+type defaultInboundUDPService DefaultInboundService
+
+func (s *defaultInboundUDPService) ReadPacket(buffer *buf.Buffer) (M.Socksaddr, error) {
+	n, addr, err := s.udpConn.ReadFromUDPAddrPort(buffer.FreeBytes())
+	if err != nil {
+		return M.Socksaddr{}, err
+	}
+	buffer.Truncate(n)
+	return M.SocksaddrFromNetIP(addr), nil
+}
+
+func (s *defaultInboundUDPService) WriteIsThreadUnsafe() {
+}
+
+type defaultInboundUDPServiceOutboundPacket struct {
+	buffer      *buf.Buffer
+	destination M.Socksaddr
+}
+
+func (s *defaultInboundUDPService) Upstream() any {
+	return s.udpConn
+}
+
+func (s *defaultInboundUDPService) WritePacket(buffer *buf.Buffer, destination M.Socksaddr) error {
+	s.access.RLock()
+	defer s.access.RUnlock()
+
+	select {
+	case <-s.closed:
+		return os.ErrClosed
+	default:
+	}
+
+	s.outbound <- &defaultInboundUDPServiceOutboundPacket{buffer, destination}
+	return nil
+}
+
+func (s *defaultInboundUDPService) Close() error {
+	return s.udpConn.Close()
+}
+
+func (s *defaultInboundUDPService) LocalAddr() net.Addr {
+	return s.udpConn.LocalAddr()
+}
+
+func (s *defaultInboundUDPService) SetDeadline(t time.Time) error {
+	return s.udpConn.SetDeadline(t)
+}
+
+func (s *defaultInboundUDPService) SetReadDeadline(t time.Time) error {
+	return s.udpConn.SetReadDeadline(t)
+}
+
+func (s *defaultInboundUDPService) SetWriteDeadline(t time.Time) error {
+	return s.udpConn.SetWriteDeadline(t)
+}

adapter/mixed/inbound.go

@@ -0,0 +1,89 @@
+package mixed
+
+import (
+	std_bufio "bufio"
+	"context"
+	"net"
+	"os"
+
+	"github.com/sagernet/sing-box/adapter"
+	"github.com/sagernet/sing-box/config"
+	C "github.com/sagernet/sing-box/constant"
+	"github.com/sagernet/sing-box/log"
+	"github.com/sagernet/sing/common"
+	"github.com/sagernet/sing/common/auth"
+	"github.com/sagernet/sing/common/buf"
+	"github.com/sagernet/sing/common/bufio"
+	M "github.com/sagernet/sing/common/metadata"
+	N "github.com/sagernet/sing/common/network"
+	"github.com/sagernet/sing/common/rw"
+	"github.com/sagernet/sing/protocol/http"
+	"github.com/sagernet/sing/protocol/socks"
+	"github.com/sagernet/sing/protocol/socks/socks4"
+	"github.com/sagernet/sing/protocol/socks/socks5"
+)
+
+var _ adapter.InboundHandler = (*Inbound)(nil)
+
+type Inbound struct {
+	router        adapter.Router
+	logger        log.Logger
+	authenticator auth.Authenticator
+}
+
+func NewInbound(router adapter.Router, logger log.Logger, options *config.SimpleInboundOptions) *Inbound {
+	return &Inbound{
+		router:        router,
+		logger:        logger,
+		authenticator: auth.NewAuthenticator(options.Users),
+	}
+}
+
+func (i *Inbound) Type() string {
+	return C.TypeMixed
+}
+
+func (i *Inbound) Network() []string {
+	return []string{C.NetworkTCP}
+}
+
+func (i *Inbound) NewConnection(ctx context.Context, conn net.Conn, metadata adapter.InboundContext) error {
+	headerType, err := rw.ReadByte(conn)
+	if err != nil {
+		return err
+	}
+	ctx = &inboundContext{ctx, metadata}
+	switch headerType {
+	case socks4.Version, socks5.Version:
+		return socks.HandleConnection0(ctx, conn, headerType, i.authenticator, (*inboundHandler)(i), M.Metadata{})
+	}
+	reader := std_bufio.NewReader(bufio.NewCachedReader(conn, buf.As([]byte{headerType})))
+	return http.HandleConnection(ctx, conn, reader, i.authenticator, (*inboundHandler)(i), M.Metadata{})
+}
+
+func (i *Inbound) NewPacket(ctx context.Context, conn N.PacketConn, buffer *buf.Buffer, metadata adapter.InboundContext) error {
+	return os.ErrInvalid
+}
+
+type inboundContext struct {
+	context.Context
+	metadata adapter.InboundContext
+}
+
+type inboundHandler Inbound
+
+func (h *inboundHandler) NewConnection(ctx context.Context, conn net.Conn, metadata M.Metadata) error {
+	inboundCtx, _ := common.Cast[*inboundContext](ctx)
+	ctx = inboundCtx.Context
+	h.logger.WithContext(ctx).Info("inbound connection to ", metadata.Destination)
+	inboundCtx.metadata.Destination = metadata.Destination
+	return h.router.RouteConnection(ctx, conn, inboundCtx.metadata)
+}
+
+func (h *inboundHandler) NewPacketConnection(ctx context.Context, conn N.PacketConn, metadata M.Metadata) error {
+	inboundCtx, _ := common.Cast[*inboundContext](ctx)
+	ctx = inboundCtx.Context
+	h.logger.WithContext(ctx).Info("inbound packet connection to ", metadata.Destination)
+	inboundCtx.metadata.Destination = metadata.Destination
+	return h.router.RoutePacketConnection(ctx, conn, inboundCtx.metadata)
+}

adapter/outbound.go

@@ -0,0 +1,21 @@
+package adapter
+
+import (
+	"context"
+	"net"
+
+	M "github.com/sagernet/sing/common/metadata"
+	N "github.com/sagernet/sing/common/network"
+)
+
+type Outbound interface {
+	Type() string
+	Tag() string
+	NewConnection(ctx context.Context, conn net.Conn, destination M.Socksaddr) error
+	NewPacketConnection(ctx context.Context, conn N.PacketConn, destination M.Socksaddr) error
+	N.Dialer
+}
+
+type OutboundInitializer interface {
+	Init(outbound Outbound) error
+}

adapter/router.go

@@ -0,0 +1,15 @@
+package adapter
+
+import (
+	"context"
+	"net"
+
+	N "github.com/sagernet/sing/common/network"
+)
+
+type Router interface {
+	DefaultOutbound() Outbound
+	Outbound(tag string) (Outbound, bool)
+	RouteConnection(ctx context.Context, conn net.Conn, metadata InboundContext) error
+	RoutePacketConnection(ctx context.Context, conn N.PacketConn, metadata InboundContext) error
+}

adapter/service.go

@@ -0,0 +1,6 @@
+package adapter
+
+type Service interface {
+	Start() error
+	Close() error
+}

adapter/shadowsocks/inbound.go

@@ -0,0 +1,114 @@
+package shadowsocks
+
+import (
+	"context"
+	"net"
+
+	"github.com/sagernet/sing-box/adapter"
+	"github.com/sagernet/sing-box/config"
+	C "github.com/sagernet/sing-box/constant"
+	"github.com/sagernet/sing-box/log"
+	"github.com/sagernet/sing-shadowsocks"
+	"github.com/sagernet/sing-shadowsocks/shadowaead"
+	"github.com/sagernet/sing-shadowsocks/shadowaead_2022"
+	"github.com/sagernet/sing/common"
+	"github.com/sagernet/sing/common/buf"
+	E "github.com/sagernet/sing/common/exceptions"
+	M "github.com/sagernet/sing/common/metadata"
+	N "github.com/sagernet/sing/common/network"
+)
+
+var ErrUnsupportedMethod = E.New("unsupported method")
+
+var _ adapter.InboundHandler = (*Inbound)(nil)
+
+type Inbound struct {
+	router  adapter.Router
+	logger  log.Logger
+	network []string
+	service shadowsocks.Service
+}
+
+func (i *Inbound) Network() []string {
+	return i.network
+}
+
+func NewInbound(router adapter.Router, logger log.Logger, options *config.ShadowsocksInboundOptions) (inbound *Inbound, err error) {
+	inbound = &Inbound{
+		router:  router,
+		logger:  logger,
+		network: options.Network.Build(),
+	}
+	handler := (*inboundHandler)(inbound)
+
+	var udpTimeout int64
+	if options.UDPTimeout != 0 {
+		udpTimeout = options.UDPTimeout
+	} else {
+		udpTimeout = 300
+	}
+
+	switch {
+	case options.Method == shadowsocks.MethodNone:
+		inbound.service = shadowsocks.NewNoneService(options.UDPTimeout, handler)
+	case common.Contains(shadowaead.List, options.Method):
+		inbound.service, err = shadowaead.NewService(options.Method, nil, options.Password, udpTimeout, handler)
+	case common.Contains(shadowaead_2022.List, options.Method):
+		inbound.service, err = shadowaead_2022.NewServiceWithPassword(options.Method, options.Password, udpTimeout, handler)
+	default:
+		err = E.Extend(ErrUnsupportedMethod, options.Method)
+	}
+	return
+}
+
+func (i *Inbound) Type() string {
+	return C.TypeShadowsocks
+}
+
+func (i *Inbound) NewConnection(ctx context.Context, conn net.Conn, metadata adapter.InboundContext) error {
+	return i.service.NewConnection(&inboundContext{ctx, metadata}, conn, M.Metadata{
+		Source: M.SocksaddrFromNetIP(metadata.Source),
+	})
+}
+
+func (i *Inbound) NewPacket(ctx context.Context, conn N.PacketConn, buffer *buf.Buffer, metadata adapter.InboundContext) error {
+	return i.service.NewPacket(&inboundContext{ctx, metadata}, conn, buffer, M.Metadata{
+		Source: M.SocksaddrFromNetIP(metadata.Source),
+	})
+}
+
+func (i *Inbound) Upstream() any {
+	return i.service
+}
+
+type inboundContext struct {
+	context.Context
+	metadata adapter.InboundContext
+}
+
+type inboundHandler Inbound
+
+func (h *inboundHandler) NewConnection(ctx context.Context, conn net.Conn, metadata M.Metadata) error {
+	inboundCtx, _ := common.Cast[*inboundContext](ctx)
+	ctx = inboundCtx.Context
+	h.logger.WithContext(ctx).Info("inbound connection to ", metadata.Destination)
+	inboundCtx.metadata.Destination = metadata.Destination
+	return h.router.RouteConnection(ctx, conn, inboundCtx.metadata)
+}
+
+func (h *inboundHandler) NewPacketConnection(ctx context.Context, conn N.PacketConn, metadata M.Metadata) error {
+	inboundCtx, _ := common.Cast[*inboundContext](ctx)
+	ctx = log.ContextWithID(inboundCtx.Context)
+	h.logger.WithContext(ctx).Info("inbound packet connection from ", inboundCtx.metadata.Source)
+	h.logger.WithContext(ctx).Info("inbound packet connection to ", metadata.Destination)
+	inboundCtx.metadata.Destination = metadata.Destination
+	return h.router.RoutePacketConnection(ctx, conn, inboundCtx.metadata)
+}
+
+func (h *inboundHandler) NewError(ctx context.Context, err error) {
+	common.Close(err)
+	if E.IsClosed(err) {
+		return
+	}
+	h.logger.WithContext(ctx).Warn(err)
+}

adapter/shadowsocks/outbound.go

@@ -0,0 +1,104 @@
+package shadowsocks
+
+import (
+	"context"
+	"net"
+
+	"github.com/sagernet/sing-box/adapter"
+	"github.com/sagernet/sing-box/common/dialer"
+	"github.com/sagernet/sing-box/common/tunnel"
+	"github.com/sagernet/sing-box/config"
+	C "github.com/sagernet/sing-box/constant"
+	"github.com/sagernet/sing-box/log"
+	"github.com/sagernet/sing-shadowsocks"
+	"github.com/sagernet/sing-shadowsocks/shadowimpl"
+	"github.com/sagernet/sing/common/bufio"
+	E "github.com/sagernet/sing/common/exceptions"
+	M "github.com/sagernet/sing/common/metadata"
+	N "github.com/sagernet/sing/common/network"
+)
+
+var _ adapter.Outbound = (*Outbound)(nil)
+
+type Outbound struct {
+	tag        string
+	logger     log.Logger
+	dialer     N.Dialer
+	method     shadowsocks.Method
+	serverAddr M.Socksaddr
+}
+
+func NewOutbound(tag string, router adapter.Router, logger log.Logger, options *config.ShadowsocksOutboundOptions) (outbound *Outbound, err error) {
+	outbound = &Outbound{
+		tag:    tag,
+		logger: logger,
+		dialer: dialer.NewDialer(router, options.DialerOptions),
+	}
+	outbound.method, err = shadowimpl.FetchMethod(options.Method, options.Password)
+	if err != nil {
+		return
+	}
+	if options.Server == "" {
+		err = E.New("missing server address")
+		return
+	} else if options.ServerPort == 0 {
+		err = E.New("missing server port")
+		return
+	}
+	outbound.serverAddr = M.ParseSocksaddrHostPort(options.Server, options.ServerPort)
+	return
+}
+
+func (o *Outbound) Type() string {
+	return C.TypeShadowsocks
+}
+
+func (o *Outbound) Tag() string {
+	return o.tag
+}
+
+func (o *Outbound) NewConnection(ctx context.Context, conn net.Conn, destination M.Socksaddr) error {
+	serverConn, err := o.DialContext(ctx, "tcp", destination)
+	if err != nil {
+		return err
+	}
+	return tunnel.CopyEarlyConn(ctx, conn, serverConn)
+}
+
+func (o *Outbound) NewPacketConnection(ctx context.Context, conn N.PacketConn, destination M.Socksaddr) error {
+	serverConn, err := o.ListenPacket(ctx)
+	if err != nil {
+		return err
+	}
+	return bufio.CopyPacketConn(ctx, conn, bufio.NewPacketConn(serverConn))
+}
+
+func (o *Outbound) DialContext(ctx context.Context, network string, destination M.Socksaddr) (net.Conn, error) {
+	switch network {
+	case C.NetworkTCP:
+		o.logger.WithContext(ctx).Debug("outbound connection to ", destination)
+		outConn, err := o.dialer.DialContext(ctx, "tcp", o.serverAddr)
+		if err != nil {
+			return nil, err
+		}
+		return o.method.DialEarlyConn(outConn, destination), nil
+	case C.NetworkUDP:
+		o.logger.WithContext(ctx).Debug("outbound packet connection to ", destination)
+		outConn, err := o.dialer.DialContext(ctx, "udp", o.serverAddr)
+		if err != nil {
+			return nil, err
+		}
+		return &bufio.BindPacketConn{PacketConn: o.method.DialPacketConn(outConn), Addr: destination}, nil
+	default:
+		panic("unknown network " + network)
+	}
+}
+
+func (o *Outbound) ListenPacket(ctx context.Context) (net.PacketConn, error) {
+	o.logger.WithContext(ctx).Debug("outbound packet connection to ", o.serverAddr)
+	outConn, err := o.dialer.ListenPacket(ctx)
+	if err != nil {
+		return nil, err
+	}
+	return o.method.DialPacketConn(&bufio.BindPacketConn{PacketConn: outConn, Addr: o.serverAddr.UDPAddr()}), nil
+}

adapter/socks/inbound.go

@@ -0,0 +1,74 @@
+package socks
+
+import (
+	"context"
+	"net"
+	"os"
+
+	"github.com/sagernet/sing-box/adapter"
+	"github.com/sagernet/sing-box/config"
+	C "github.com/sagernet/sing-box/constant"
+	"github.com/sagernet/sing-box/log"
+	"github.com/sagernet/sing/common"
+	"github.com/sagernet/sing/common/auth"
+	"github.com/sagernet/sing/common/buf"
+	M "github.com/sagernet/sing/common/metadata"
+	N "github.com/sagernet/sing/common/network"
+	"github.com/sagernet/sing/protocol/socks"
+)
+
+var _ adapter.InboundHandler = (*Inbound)(nil)
+
+type Inbound struct {
+	router        adapter.Router
+	logger        log.Logger
+	authenticator auth.Authenticator
+}
+
+func NewInbound(router adapter.Router, logger log.Logger, options *config.SimpleInboundOptions) *Inbound {
+	return &Inbound{
+		router:        router,
+		logger:        logger,
+		authenticator: auth.NewAuthenticator(options.Users),
+	}
+}
+
+func (i *Inbound) Type() string {
+	return C.TypeSocks
+}
+
+func (i *Inbound) Network() []string {
+	return []string{C.NetworkTCP}
+}
+
+func (i *Inbound) NewConnection(ctx context.Context, conn net.Conn, metadata adapter.InboundContext) error {
+	ctx = &inboundContext{ctx, metadata}
+	return socks.HandleConnection(ctx, conn, i.authenticator, (*inboundHandler)(i), M.Metadata{})
+}
+
+func (i *Inbound) NewPacket(ctx context.Context, conn N.PacketConn, buffer *buf.Buffer, metadata adapter.InboundContext) error {
+	return os.ErrInvalid
+}
+
+type inboundContext struct {
+	context.Context
+	metadata adapter.InboundContext
+}
+
+type inboundHandler Inbound
+
+func (h *inboundHandler) NewConnection(ctx context.Context, conn net.Conn, metadata M.Metadata) error {
+	inboundCtx, _ := common.Cast[*inboundContext](ctx)
+	ctx = inboundCtx.Context
+	h.logger.WithContext(ctx).Info("inbound connection to ", metadata.Destination)
+	inboundCtx.metadata.Destination = metadata.Destination
+	return h.router.RouteConnection(ctx, conn, inboundCtx.metadata)
+}
+
+func (h *inboundHandler) NewPacketConnection(ctx context.Context, conn N.PacketConn, metadata M.Metadata) error {
+	inboundCtx, _ := common.Cast[*inboundContext](ctx)
+	ctx = inboundCtx.Context
+	h.logger.WithContext(ctx).Info("inbound packet connection to ", metadata.Destination)
+	inboundCtx.metadata.Destination = metadata.Destination
+	return h.router.RoutePacketConnection(ctx, conn, inboundCtx.metadata)
+}