mirror of
https://github.com/SagerNet/sing-box.git
synced 2024-11-23 09:01:30 +00:00
231 lines
7.4 KiB
Go
231 lines
7.4 KiB
Go
package inbound
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import (
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"context"
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"net"
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"os"
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"github.com/sagernet/sing-box/adapter"
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"github.com/sagernet/sing-box/common/mux"
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"github.com/sagernet/sing-box/common/tls"
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C "github.com/sagernet/sing-box/constant"
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"github.com/sagernet/sing-box/log"
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"github.com/sagernet/sing-box/option"
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"github.com/sagernet/sing-box/transport/trojan"
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"github.com/sagernet/sing-box/transport/v2ray"
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"github.com/sagernet/sing/common"
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"github.com/sagernet/sing/common/auth"
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E "github.com/sagernet/sing/common/exceptions"
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F "github.com/sagernet/sing/common/format"
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M "github.com/sagernet/sing/common/metadata"
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N "github.com/sagernet/sing/common/network"
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)
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var (
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_ adapter.Inbound = (*Trojan)(nil)
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_ adapter.TCPInjectableInbound = (*Trojan)(nil)
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)
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type Trojan struct {
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myInboundAdapter
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service *trojan.Service[int]
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users []option.TrojanUser
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tlsConfig tls.ServerConfig
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fallbackAddr M.Socksaddr
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fallbackAddrTLSNextProto map[string]M.Socksaddr
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transport adapter.V2RayServerTransport
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}
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func NewTrojan(ctx context.Context, router adapter.Router, logger log.ContextLogger, tag string, options option.TrojanInboundOptions) (*Trojan, error) {
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inbound := &Trojan{
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myInboundAdapter: myInboundAdapter{
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protocol: C.TypeTrojan,
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network: []string{N.NetworkTCP},
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ctx: ctx,
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router: router,
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logger: logger,
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tag: tag,
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listenOptions: options.ListenOptions,
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},
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users: options.Users,
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}
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if options.TLS != nil {
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tlsConfig, err := tls.NewServer(ctx, logger, common.PtrValueOrDefault(options.TLS))
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if err != nil {
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return nil, err
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}
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inbound.tlsConfig = tlsConfig
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}
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var fallbackHandler N.TCPConnectionHandler
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if options.Fallback != nil && options.Fallback.Server != "" || len(options.FallbackForALPN) > 0 {
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if options.Fallback != nil && options.Fallback.Server != "" {
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inbound.fallbackAddr = options.Fallback.Build()
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if !inbound.fallbackAddr.IsValid() {
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return nil, E.New("invalid fallback address: ", inbound.fallbackAddr)
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}
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}
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if len(options.FallbackForALPN) > 0 {
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if inbound.tlsConfig == nil {
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return nil, E.New("fallback for ALPN is not supported without TLS")
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}
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fallbackAddrNextProto := make(map[string]M.Socksaddr)
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for nextProto, destination := range options.FallbackForALPN {
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fallbackAddr := destination.Build()
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if !fallbackAddr.IsValid() {
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return nil, E.New("invalid fallback address for ALPN ", nextProto, ": ", fallbackAddr)
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}
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fallbackAddrNextProto[nextProto] = fallbackAddr
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}
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inbound.fallbackAddrTLSNextProto = fallbackAddrNextProto
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}
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fallbackHandler = adapter.NewUpstreamContextHandler(inbound.fallbackConnection, nil, nil)
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}
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service := trojan.NewService[int](adapter.NewUpstreamContextHandler(inbound.newConnection, inbound.newPacketConnection, inbound), fallbackHandler)
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err := service.UpdateUsers(common.MapIndexed(options.Users, func(index int, it option.TrojanUser) int {
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return index
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}), common.Map(options.Users, func(it option.TrojanUser) string {
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return it.Password
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}))
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if err != nil {
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return nil, err
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}
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if options.Transport != nil {
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inbound.transport, err = v2ray.NewServerTransport(ctx, logger, common.PtrValueOrDefault(options.Transport), inbound.tlsConfig, (*trojanTransportHandler)(inbound))
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if err != nil {
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return nil, E.Cause(err, "create server transport: ", options.Transport.Type)
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}
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}
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inbound.router, err = mux.NewRouterWithOptions(inbound.router, logger, common.PtrValueOrDefault(options.Multiplex))
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if err != nil {
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return nil, err
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}
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inbound.service = service
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inbound.connHandler = inbound
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return inbound, nil
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}
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func (h *Trojan) Start() error {
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if h.tlsConfig != nil {
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err := h.tlsConfig.Start()
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if err != nil {
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return E.Cause(err, "create TLS config")
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}
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}
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if h.transport == nil {
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return h.myInboundAdapter.Start()
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}
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if common.Contains(h.transport.Network(), N.NetworkTCP) {
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tcpListener, err := h.myInboundAdapter.ListenTCP()
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if err != nil {
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return err
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}
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go func() {
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sErr := h.transport.Serve(tcpListener)
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if sErr != nil && !E.IsClosed(sErr) {
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h.logger.Error("transport serve error: ", sErr)
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}
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}()
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}
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if common.Contains(h.transport.Network(), N.NetworkUDP) {
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udpConn, err := h.myInboundAdapter.ListenUDP()
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if err != nil {
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return err
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}
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go func() {
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sErr := h.transport.ServePacket(udpConn)
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if sErr != nil && !E.IsClosed(sErr) {
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h.logger.Error("transport serve error: ", sErr)
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}
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}()
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}
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return nil
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}
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func (h *Trojan) Close() error {
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return common.Close(
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&h.myInboundAdapter,
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h.tlsConfig,
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h.transport,
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)
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}
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func (h *Trojan) NewConnection(ctx context.Context, conn net.Conn, metadata adapter.InboundContext) error {
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var err error
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if h.tlsConfig != nil && h.transport == nil {
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conn, err = tls.ServerHandshake(ctx, conn, h.tlsConfig)
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if err != nil {
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return err
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}
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}
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return h.service.NewConnection(adapter.WithContext(ctx, &metadata), conn, adapter.UpstreamMetadata(metadata))
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}
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func (h *Trojan) NewConnectionEx(ctx context.Context, conn net.Conn, metadata adapter.InboundContext, onClose N.CloseHandlerFunc) {
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err := h.NewConnection(ctx, conn, metadata)
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N.CloseOnHandshakeFailure(conn, onClose, err)
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if err != nil {
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h.logger.ErrorContext(ctx, E.Cause(err, "process connection from ", metadata.Source))
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}
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}
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func (h *Trojan) newConnection(ctx context.Context, conn net.Conn, metadata adapter.InboundContext) error {
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userIndex, loaded := auth.UserFromContext[int](ctx)
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if !loaded {
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return os.ErrInvalid
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}
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user := h.users[userIndex].Name
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if user == "" {
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user = F.ToString(userIndex)
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} else {
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metadata.User = user
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}
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h.logger.InfoContext(ctx, "[", user, "] inbound connection to ", metadata.Destination)
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return h.router.RouteConnection(ctx, conn, metadata)
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}
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func (h *Trojan) fallbackConnection(ctx context.Context, conn net.Conn, metadata adapter.InboundContext) error {
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var fallbackAddr M.Socksaddr
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if len(h.fallbackAddrTLSNextProto) > 0 {
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if tlsConn, loaded := common.Cast[tls.Conn](conn); loaded {
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connectionState := tlsConn.ConnectionState()
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if connectionState.NegotiatedProtocol != "" {
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if fallbackAddr, loaded = h.fallbackAddrTLSNextProto[connectionState.NegotiatedProtocol]; !loaded {
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return E.New("fallback disabled for ALPN: ", connectionState.NegotiatedProtocol)
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}
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}
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}
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}
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if !fallbackAddr.IsValid() {
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if !h.fallbackAddr.IsValid() {
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return E.New("fallback disabled by default")
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}
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fallbackAddr = h.fallbackAddr
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}
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h.logger.InfoContext(ctx, "fallback connection to ", fallbackAddr)
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metadata.Destination = fallbackAddr
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return h.router.RouteConnection(ctx, conn, metadata)
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}
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func (h *Trojan) newPacketConnection(ctx context.Context, conn N.PacketConn, metadata adapter.InboundContext) error {
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userIndex, loaded := auth.UserFromContext[int](ctx)
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if !loaded {
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return os.ErrInvalid
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}
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user := h.users[userIndex].Name
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if user == "" {
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user = F.ToString(userIndex)
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} else {
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metadata.User = user
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}
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h.logger.InfoContext(ctx, "[", user, "] inbound packet connection to ", metadata.Destination)
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return h.router.RoutePacketConnection(ctx, conn, metadata)
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}
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var _ adapter.V2RayServerTransportHandler = (*trojanTransportHandler)(nil)
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type trojanTransportHandler Trojan
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func (t *trojanTransportHandler) NewConnectionEx(ctx context.Context, conn net.Conn, source M.Socksaddr, destination M.Socksaddr, onClose N.CloseHandlerFunc) {
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(*Trojan)(t).routeTCP(ctx, conn, source, destination, onClose)
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}
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