Xray-core/proxy/loopback/loopback.go

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