package inbound import ( "context" "net" "strconv" "strings" "time" "github.com/sagernet/sing-box/adapter" "github.com/sagernet/sing-box/common/taskmonitor" C "github.com/sagernet/sing-box/constant" "github.com/sagernet/sing-box/experimental/libbox/platform" "github.com/sagernet/sing-box/log" "github.com/sagernet/sing-box/option" "github.com/sagernet/sing-tun" "github.com/sagernet/sing/common" E "github.com/sagernet/sing/common/exceptions" M "github.com/sagernet/sing/common/metadata" N "github.com/sagernet/sing/common/network" "github.com/sagernet/sing/common/ranges" ) var _ adapter.Inbound = (*Tun)(nil) type Tun struct { tag string ctx context.Context router adapter.Router logger log.ContextLogger inboundOptions option.InboundOptions tunOptions tun.Options endpointIndependentNat bool udpTimeout int64 stack string tunIf tun.Tun tunStack tun.Stack platformInterface platform.Interface platformOptions option.TunPlatformOptions } func NewTun(ctx context.Context, router adapter.Router, logger log.ContextLogger, tag string, options option.TunInboundOptions, platformInterface platform.Interface) (*Tun, error) { tunMTU := options.MTU if tunMTU == 0 { tunMTU = 9000 } var udpTimeout time.Duration if options.UDPTimeout != 0 { udpTimeout = time.Duration(options.UDPTimeout) } else { udpTimeout = C.UDPTimeout } includeUID := uidToRange(options.IncludeUID) if len(options.IncludeUIDRange) > 0 { var err error includeUID, err = parseRange(includeUID, options.IncludeUIDRange) if err != nil { return nil, E.Cause(err, "parse include_uid_range") } } excludeUID := uidToRange(options.ExcludeUID) if len(options.ExcludeUIDRange) > 0 { var err error excludeUID, err = parseRange(excludeUID, options.ExcludeUIDRange) if err != nil { return nil, E.Cause(err, "parse exclude_uid_range") } } return &Tun{ tag: tag, ctx: ctx, router: router, logger: logger, inboundOptions: options.InboundOptions, tunOptions: tun.Options{ Name: options.InterfaceName, MTU: tunMTU, GSO: options.GSO, Inet4Address: options.Inet4Address, Inet6Address: options.Inet6Address, AutoRoute: options.AutoRoute, StrictRoute: options.StrictRoute, IncludeInterface: options.IncludeInterface, ExcludeInterface: options.ExcludeInterface, Inet4RouteAddress: options.Inet4RouteAddress, Inet6RouteAddress: options.Inet6RouteAddress, Inet4RouteExcludeAddress: options.Inet4RouteExcludeAddress, Inet6RouteExcludeAddress: options.Inet6RouteExcludeAddress, IncludeUID: includeUID, ExcludeUID: excludeUID, IncludeAndroidUser: options.IncludeAndroidUser, IncludePackage: options.IncludePackage, ExcludePackage: options.ExcludePackage, InterfaceMonitor: router.InterfaceMonitor(), TableIndex: 2022, }, endpointIndependentNat: options.EndpointIndependentNat, udpTimeout: int64(udpTimeout.Seconds()), stack: options.Stack, platformInterface: platformInterface, platformOptions: common.PtrValueOrDefault(options.Platform), }, nil } func uidToRange(uidList option.Listable[uint32]) []ranges.Range[uint32] { return common.Map(uidList, func(uid uint32) ranges.Range[uint32] { return ranges.NewSingle(uid) }) } func parseRange(uidRanges []ranges.Range[uint32], rangeList []string) ([]ranges.Range[uint32], error) { for _, uidRange := range rangeList { if !strings.Contains(uidRange, ":") { return nil, E.New("missing ':' in range: ", uidRange) } subIndex := strings.Index(uidRange, ":") if subIndex == 0 { return nil, E.New("missing range start: ", uidRange) } else if subIndex == len(uidRange)-1 { return nil, E.New("missing range end: ", uidRange) } var start, end uint64 var err error start, err = strconv.ParseUint(uidRange[:subIndex], 10, 32) if err != nil { return nil, E.Cause(err, "parse range start") } end, err = strconv.ParseUint(uidRange[subIndex+1:], 10, 32) if err != nil { return nil, E.Cause(err, "parse range end") } uidRanges = append(uidRanges, ranges.New(uint32(start), uint32(end))) } return uidRanges, nil } func (t *Tun) Type() string { return C.TypeTun } func (t *Tun) Tag() string { return t.tag } func (t *Tun) Start() error { if C.IsAndroid && t.platformInterface == nil { t.tunOptions.BuildAndroidRules(t.router.PackageManager(), t) } if t.tunOptions.Name == "" { t.tunOptions.Name = tun.CalculateInterfaceName("") } var ( tunInterface tun.Tun err error ) monitor := taskmonitor.New(t.logger, C.StartTimeout) monitor.Start("open tun interface") if t.platformInterface != nil { tunInterface, err = t.platformInterface.OpenTun(&t.tunOptions, t.platformOptions) } else { tunInterface, err = tun.New(t.tunOptions) } monitor.Finish() if err != nil { return E.Cause(err, "configure tun interface") } t.logger.Trace("creating stack") t.tunIf = tunInterface var ( forwarderBindInterface bool includeAllNetworks bool ) if t.platformInterface != nil { forwarderBindInterface = true includeAllNetworks = t.platformInterface.IncludeAllNetworks() } t.tunStack, err = tun.NewStack(t.stack, tun.StackOptions{ Context: t.ctx, Tun: tunInterface, TunOptions: t.tunOptions, EndpointIndependentNat: t.endpointIndependentNat, UDPTimeout: t.udpTimeout, Handler: t, Logger: t.logger, ForwarderBindInterface: forwarderBindInterface, InterfaceFinder: t.router.InterfaceFinder(), IncludeAllNetworks: includeAllNetworks, }) if err != nil { return err } monitor.Start("initiating tun stack") err = t.tunStack.Start() monitor.Finish() if err != nil { return err } t.logger.Info("started at ", t.tunOptions.Name) return nil } func (t *Tun) Close() error { return common.Close( t.tunStack, t.tunIf, ) } func (t *Tun) NewConnection(ctx context.Context, conn net.Conn, upstreamMetadata M.Metadata) error { ctx = log.ContextWithNewID(ctx) var metadata adapter.InboundContext metadata.Inbound = t.tag metadata.InboundType = C.TypeTun metadata.Source = upstreamMetadata.Source metadata.Destination = upstreamMetadata.Destination metadata.InboundOptions = t.inboundOptions t.logger.InfoContext(ctx, "inbound connection from ", metadata.Source) t.logger.InfoContext(ctx, "inbound connection to ", metadata.Destination) err := t.router.RouteConnection(ctx, conn, metadata) if err != nil { t.NewError(ctx, err) } return nil } func (t *Tun) NewPacketConnection(ctx context.Context, conn N.PacketConn, upstreamMetadata M.Metadata) error { ctx = log.ContextWithNewID(ctx) var metadata adapter.InboundContext metadata.Inbound = t.tag metadata.InboundType = C.TypeTun metadata.Source = upstreamMetadata.Source metadata.Destination = upstreamMetadata.Destination metadata.InboundOptions = t.inboundOptions t.logger.InfoContext(ctx, "inbound packet connection from ", metadata.Source) t.logger.InfoContext(ctx, "inbound packet connection to ", metadata.Destination) err := t.router.RoutePacketConnection(ctx, conn, metadata) if err != nil { t.NewError(ctx, err) } return nil } func (t *Tun) NewError(ctx context.Context, err error) { NewError(t.logger, ctx, err) }