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125 lines
3.2 KiB
125 lines
3.2 KiB
package loopback
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import (
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"context"
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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/errors"
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"github.com/xtls/xray-core/common/net"
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"github.com/xtls/xray-core/common/net/cnc"
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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/task"
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"github.com/xtls/xray-core/core"
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"github.com/xtls/xray-core/features/routing"
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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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)
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type Loopback struct {
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config *Config
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dispatcherInstance routing.Dispatcher
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}
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func (l *Loopback) Process(ctx context.Context, link *transport.Link, _ internet.Dialer) error {
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outbounds := session.OutboundsFromContext(ctx)
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ob := outbounds[len(outbounds)-1]
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if !ob.Target.IsValid() {
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return errors.New("target not specified.")
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}
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ob.Name = "loopback"
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destination := ob.Target
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errors.LogInfo(ctx, "opening connection to ", destination)
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input := link.Reader
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output := link.Writer
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var conn net.Conn
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err := retry.ExponentialBackoff(2, 100).On(func() error {
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dialDest := destination
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content := new(session.Content)
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content.SkipDNSResolve = true
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ctx = session.ContextWithContent(ctx, content)
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inbound := session.InboundFromContext(ctx)
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inbound.Tag = l.config.InboundTag
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ctx = session.ContextWithInbound(ctx, inbound)
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rawConn, err := l.dispatcherInstance.Dispatch(ctx, dialDest)
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if err != nil {
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return err
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}
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var readerOpt cnc.ConnectionOption
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if dialDest.Network == net.Network_TCP {
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readerOpt = cnc.ConnectionOutputMulti(rawConn.Reader)
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} else {
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readerOpt = cnc.ConnectionOutputMultiUDP(rawConn.Reader)
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}
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conn = cnc.NewConnection(cnc.ConnectionInputMulti(rawConn.Writer), readerOpt)
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return nil
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})
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if err != nil {
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return errors.New("failed to open connection to ", destination).Base(err)
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}
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defer conn.Close()
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requestDone := func() error {
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var writer buf.Writer
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if destination.Network == net.Network_TCP {
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writer = buf.NewWriter(conn)
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} else {
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writer = &buf.SequentialWriter{Writer: conn}
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}
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if err := buf.Copy(input, writer); err != nil {
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return errors.New("failed to process request").Base(err)
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}
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return nil
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}
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responseDone := func() error {
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var reader buf.Reader
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if destination.Network == net.Network_TCP {
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reader = buf.NewReader(conn)
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} else {
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reader = buf.NewPacketReader(conn)
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}
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if err := buf.Copy(reader, output); err != nil {
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return errors.New("failed to process response").Base(err)
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}
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return nil
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}
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if err := task.Run(ctx, requestDone, task.OnSuccess(responseDone, task.Close(output))); err != nil {
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return errors.New("connection ends").Base(err)
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}
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return nil
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}
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func (l *Loopback) init(config *Config, dispatcherInstance routing.Dispatcher) error {
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l.dispatcherInstance = dispatcherInstance
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l.config = config
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return nil
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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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l := new(Loopback)
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err := core.RequireFeatures(ctx, func(dispatcherInstance routing.Dispatcher) error {
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return l.init(config.(*Config), dispatcherInstance)
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})
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return l, err
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}))
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}
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