mirror of
https://github.com/XTLS/Xray-core.git
synced 2024-11-04 12:09:19 +02:00
324 lines
11 KiB
Go
324 lines
11 KiB
Go
package outbound
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//go:generate go run github.com/xtls/xray-core/common/errors/errorgen
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import (
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"bytes"
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"context"
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gotls "crypto/tls"
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"reflect"
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"syscall"
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"time"
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"unsafe"
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utls "github.com/refraction-networking/utls"
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"github.com/xtls/xray-core/common"
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"github.com/xtls/xray-core/common/buf"
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"github.com/xtls/xray-core/common/net"
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"github.com/xtls/xray-core/common/protocol"
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"github.com/xtls/xray-core/common/retry"
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"github.com/xtls/xray-core/common/session"
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"github.com/xtls/xray-core/common/signal"
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"github.com/xtls/xray-core/common/task"
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"github.com/xtls/xray-core/common/xudp"
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"github.com/xtls/xray-core/core"
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"github.com/xtls/xray-core/features/policy"
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"github.com/xtls/xray-core/features/stats"
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"github.com/xtls/xray-core/proxy/vless"
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"github.com/xtls/xray-core/proxy/vless/encoding"
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"github.com/xtls/xray-core/transport"
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"github.com/xtls/xray-core/transport/internet"
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"github.com/xtls/xray-core/transport/internet/reality"
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"github.com/xtls/xray-core/transport/internet/stat"
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"github.com/xtls/xray-core/transport/internet/tls"
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)
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func init() {
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common.Must(common.RegisterConfig((*Config)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
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return New(ctx, config.(*Config))
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}))
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}
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// Handler is an outbound connection handler for VLess protocol.
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type Handler struct {
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serverList *protocol.ServerList
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serverPicker protocol.ServerPicker
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policyManager policy.Manager
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cone bool
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}
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// New creates a new VLess outbound handler.
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func New(ctx context.Context, config *Config) (*Handler, error) {
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serverList := protocol.NewServerList()
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for _, rec := range config.Vnext {
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s, err := protocol.NewServerSpecFromPB(rec)
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if err != nil {
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return nil, newError("failed to parse server spec").Base(err).AtError()
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}
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serverList.AddServer(s)
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}
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v := core.MustFromContext(ctx)
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handler := &Handler{
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serverList: serverList,
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serverPicker: protocol.NewRoundRobinServerPicker(serverList),
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policyManager: v.GetFeature(policy.ManagerType()).(policy.Manager),
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cone: ctx.Value("cone").(bool),
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}
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return handler, nil
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}
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// Process implements proxy.Outbound.Process().
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func (h *Handler) Process(ctx context.Context, link *transport.Link, dialer internet.Dialer) error {
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var rec *protocol.ServerSpec
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var conn stat.Connection
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if err := retry.ExponentialBackoff(5, 200).On(func() error {
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rec = h.serverPicker.PickServer()
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var err error
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conn, err = dialer.Dial(ctx, rec.Destination())
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if err != nil {
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return err
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}
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return nil
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}); err != nil {
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return newError("failed to find an available destination").Base(err).AtWarning()
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}
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defer conn.Close()
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iConn := conn
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statConn, ok := iConn.(*stat.CounterConnection)
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if ok {
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iConn = statConn.Connection
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}
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outbound := session.OutboundFromContext(ctx)
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if outbound == nil || !outbound.Target.IsValid() {
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return newError("target not specified").AtError()
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}
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target := outbound.Target
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newError("tunneling request to ", target, " via ", rec.Destination().NetAddr()).AtInfo().WriteToLog(session.ExportIDToError(ctx))
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command := protocol.RequestCommandTCP
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if target.Network == net.Network_UDP {
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command = protocol.RequestCommandUDP
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}
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if target.Address.Family().IsDomain() && target.Address.Domain() == "v1.mux.cool" {
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command = protocol.RequestCommandMux
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}
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request := &protocol.RequestHeader{
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Version: encoding.Version,
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User: rec.PickUser(),
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Command: command,
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Address: target.Address,
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Port: target.Port,
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}
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account := request.User.Account.(*vless.MemoryAccount)
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requestAddons := &encoding.Addons{
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Flow: account.Flow,
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}
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var netConn net.Conn
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var rawConn syscall.RawConn
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var input *bytes.Reader
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var rawInput *bytes.Buffer
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allowUDP443 := false
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switch requestAddons.Flow {
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case vless.XRV + "-udp443":
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allowUDP443 = true
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requestAddons.Flow = requestAddons.Flow[:16]
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fallthrough
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case vless.XRV:
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switch request.Command {
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case protocol.RequestCommandUDP:
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if !allowUDP443 && request.Port == 443 {
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return newError("XTLS rejected UDP/443 traffic").AtInfo()
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}
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requestAddons.Flow = ""
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case protocol.RequestCommandMux:
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fallthrough // let server break Mux connections that contain TCP requests
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case protocol.RequestCommandTCP:
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var t reflect.Type
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var p uintptr
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if tlsConn, ok := iConn.(*tls.Conn); ok {
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netConn = tlsConn.NetConn()
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t = reflect.TypeOf(tlsConn.Conn).Elem()
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p = uintptr(unsafe.Pointer(tlsConn.Conn))
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} else if utlsConn, ok := iConn.(*tls.UConn); ok {
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netConn = utlsConn.NetConn()
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t = reflect.TypeOf(utlsConn.Conn).Elem()
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p = uintptr(unsafe.Pointer(utlsConn.Conn))
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} else if realityConn, ok := iConn.(*reality.UConn); ok {
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netConn = realityConn.NetConn()
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t = reflect.TypeOf(realityConn.Conn).Elem()
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p = uintptr(unsafe.Pointer(realityConn.Conn))
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} else {
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return newError("XTLS only supports TLS and REALITY directly for now.").AtWarning()
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}
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if sc, ok := netConn.(syscall.Conn); ok {
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rawConn, _ = sc.SyscallConn()
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}
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i, _ := t.FieldByName("input")
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r, _ := t.FieldByName("rawInput")
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input = (*bytes.Reader)(unsafe.Pointer(p + i.Offset))
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rawInput = (*bytes.Buffer)(unsafe.Pointer(p + r.Offset))
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}
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}
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var newCtx context.Context
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var newCancel context.CancelFunc
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if session.TimeoutOnlyFromContext(ctx) {
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newCtx, newCancel = context.WithCancel(context.Background())
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}
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sessionPolicy := h.policyManager.ForLevel(request.User.Level)
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ctx, cancel := context.WithCancel(ctx)
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timer := signal.CancelAfterInactivity(ctx, func() {
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cancel()
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if newCancel != nil {
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newCancel()
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}
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}, sessionPolicy.Timeouts.ConnectionIdle)
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clientReader := link.Reader // .(*pipe.Reader)
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clientWriter := link.Writer // .(*pipe.Writer)
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enableXtls := false
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isTLS12orAbove := false
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isTLS := false
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var cipher uint16 = 0
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var remainingServerHello int32 = -1
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numberOfPacketToFilter := 8
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if request.Command == protocol.RequestCommandUDP && h.cone && request.Port != 53 && request.Port != 443 {
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request.Command = protocol.RequestCommandMux
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request.Address = net.DomainAddress("v1.mux.cool")
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request.Port = net.Port(666)
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}
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postRequest := func() error {
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defer timer.SetTimeout(sessionPolicy.Timeouts.DownlinkOnly)
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bufferWriter := buf.NewBufferedWriter(buf.NewWriter(conn))
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if err := encoding.EncodeRequestHeader(bufferWriter, request, requestAddons); err != nil {
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return newError("failed to encode request header").Base(err).AtWarning()
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}
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// default: serverWriter := bufferWriter
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serverWriter := encoding.EncodeBodyAddons(bufferWriter, request, requestAddons)
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if request.Command == protocol.RequestCommandMux && request.Port == 666 {
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serverWriter = xudp.NewPacketWriter(serverWriter, target, xudp.GetGlobalID(ctx))
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}
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userUUID := account.ID.Bytes()
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timeoutReader, ok := clientReader.(buf.TimeoutReader)
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if ok {
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multiBuffer, err1 := timeoutReader.ReadMultiBufferTimeout(time.Millisecond * 500)
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if err1 == nil {
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if requestAddons.Flow == vless.XRV {
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encoding.XtlsFilterTls(multiBuffer, &numberOfPacketToFilter, &enableXtls, &isTLS12orAbove, &isTLS, &cipher, &remainingServerHello, ctx)
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multiBuffer = encoding.ReshapeMultiBuffer(ctx, multiBuffer)
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for i, b := range multiBuffer {
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multiBuffer[i] = encoding.XtlsPadding(b, encoding.CommandPaddingContinue, &userUUID, isTLS, ctx)
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}
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}
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if err := serverWriter.WriteMultiBuffer(multiBuffer); err != nil {
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return err // ...
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}
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} else if err1 != buf.ErrReadTimeout {
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return err1
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} else if requestAddons.Flow == vless.XRV {
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mb := make(buf.MultiBuffer, 1)
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mb[0] = encoding.XtlsPadding(nil, encoding.CommandPaddingContinue, &userUUID, true, ctx) // we do a long padding to hide vless header
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newError("Insert padding with empty content to camouflage VLESS header ", mb.Len()).WriteToLog(session.ExportIDToError(ctx))
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if err := serverWriter.WriteMultiBuffer(mb); err != nil {
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return err
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}
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}
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} else {
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newError("Reader is not timeout reader, will send out vless header separately from first payload").AtDebug().WriteToLog(session.ExportIDToError(ctx))
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}
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// Flush; bufferWriter.WriteMultiBufer now is bufferWriter.writer.WriteMultiBuffer
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if err := bufferWriter.SetBuffered(false); err != nil {
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return newError("failed to write A request payload").Base(err).AtWarning()
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}
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var err error
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if rawConn != nil && requestAddons.Flow == vless.XRV {
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if tlsConn, ok := iConn.(*tls.Conn); ok {
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if tlsConn.ConnectionState().Version != gotls.VersionTLS13 {
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return newError(`failed to use `+requestAddons.Flow+`, found outer tls version `, tlsConn.ConnectionState().Version).AtWarning()
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}
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} else if utlsConn, ok := iConn.(*tls.UConn); ok {
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if utlsConn.ConnectionState().Version != utls.VersionTLS13 {
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return newError(`failed to use `+requestAddons.Flow+`, found outer tls version `, utlsConn.ConnectionState().Version).AtWarning()
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}
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}
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var counter stats.Counter
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if statConn != nil {
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counter = statConn.WriteCounter
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}
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err = encoding.XtlsWrite(clientReader, serverWriter, timer, netConn, counter, ctx, &numberOfPacketToFilter,
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&enableXtls, &isTLS12orAbove, &isTLS, &cipher, &remainingServerHello)
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} else {
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// from clientReader.ReadMultiBuffer to serverWriter.WriteMultiBufer
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err = buf.Copy(clientReader, serverWriter, buf.UpdateActivity(timer))
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}
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if err != nil {
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return newError("failed to transfer request payload").Base(err).AtInfo()
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}
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// Indicates the end of request payload.
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switch requestAddons.Flow {
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default:
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}
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return nil
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}
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getResponse := func() error {
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defer timer.SetTimeout(sessionPolicy.Timeouts.UplinkOnly)
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responseAddons, err := encoding.DecodeResponseHeader(conn, request)
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if err != nil {
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return newError("failed to decode response header").Base(err).AtInfo()
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}
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// default: serverReader := buf.NewReader(conn)
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serverReader := encoding.DecodeBodyAddons(conn, request, responseAddons)
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if request.Command == protocol.RequestCommandMux && request.Port == 666 {
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serverReader = xudp.NewPacketReader(conn)
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}
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if rawConn != nil {
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var counter stats.Counter
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if statConn != nil {
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counter = statConn.ReadCounter
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}
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err = encoding.XtlsRead(serverReader, clientWriter, timer, netConn, rawConn, input, rawInput, counter, ctx, account.ID.Bytes(),
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&numberOfPacketToFilter, &enableXtls, &isTLS12orAbove, &isTLS, &cipher, &remainingServerHello)
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} else {
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// from serverReader.ReadMultiBuffer to clientWriter.WriteMultiBufer
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err = buf.Copy(serverReader, clientWriter, buf.UpdateActivity(timer))
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}
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if err != nil {
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return newError("failed to transfer response payload").Base(err).AtInfo()
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}
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return nil
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}
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if newCtx != nil {
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ctx = newCtx
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}
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if err := task.Run(ctx, postRequest, task.OnSuccess(getResponse, task.Close(clientWriter))); err != nil {
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return newError("connection ends").Base(err).AtInfo()
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}
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return nil
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}
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