Xray-core/proxy/trojan/client.go

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package trojan
import (
"context"
"time"
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"github.com/xtls/xray-core/common"
"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"
"github.com/xtls/xray-core/common/protocol"
"github.com/xtls/xray-core/common/retry"
"github.com/xtls/xray-core/common/session"
"github.com/xtls/xray-core/common/signal"
"github.com/xtls/xray-core/common/task"
core "github.com/xtls/xray-core/core"
"github.com/xtls/xray-core/features/policy"
"github.com/xtls/xray-core/transport"
"github.com/xtls/xray-core/transport/internet"
"github.com/xtls/xray-core/transport/internet/stat"
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)
// Client is a inbound handler for trojan protocol
type Client struct {
serverPicker protocol.ServerPicker
policyManager policy.Manager
}
// NewClient create a new trojan client.
func NewClient(ctx context.Context, config *ClientConfig) (*Client, error) {
serverList := protocol.NewServerList()
for _, rec := range config.Server {
s, err := protocol.NewServerSpecFromPB(rec)
if err != nil {
return nil, errors.New("failed to parse server spec").Base(err)
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}
serverList.AddServer(s)
}
if serverList.Size() == 0 {
return nil, errors.New("0 server")
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}
v := core.MustFromContext(ctx)
client := &Client{
serverPicker: protocol.NewRoundRobinServerPicker(serverList),
policyManager: v.GetFeature(policy.ManagerType()).(policy.Manager),
}
return client, nil
}
// Process implements OutboundHandler.Process().
func (c *Client) Process(ctx context.Context, link *transport.Link, dialer 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 = "trojan"
ob.CanSpliceCopy = 3
destination := ob.Target
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network := destination.Network
var server *protocol.ServerSpec
var conn stat.Connection
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err := retry.ExponentialBackoff(5, 100).On(func() error {
server = c.serverPicker.PickServer()
rawConn, err := dialer.Dial(ctx, server.Destination())
if err != nil {
return err
}
conn = rawConn
return nil
})
if err != nil {
return errors.New("failed to find an available destination").AtWarning().Base(err)
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}
errors.LogInfo(ctx, "tunneling request to ", destination, " via ", server.Destination().NetAddr())
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defer conn.Close()
user := server.PickUser()
account, ok := user.Account.(*MemoryAccount)
if !ok {
return errors.New("user account is not valid")
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}
var newCtx context.Context
var newCancel context.CancelFunc
if session.TimeoutOnlyFromContext(ctx) {
newCtx, newCancel = context.WithCancel(context.Background())
}
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sessionPolicy := c.policyManager.ForLevel(user.Level)
ctx, cancel := context.WithCancel(ctx)
timer := signal.CancelAfterInactivity(ctx, func() {
cancel()
if newCancel != nil {
newCancel()
}
}, sessionPolicy.Timeouts.ConnectionIdle)
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postRequest := func() error {
defer timer.SetTimeout(sessionPolicy.Timeouts.DownlinkOnly)
bufferWriter := buf.NewBufferedWriter(buf.NewWriter(conn))
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connWriter := &ConnWriter{
Writer: bufferWriter,
Target: destination,
Account: account,
}
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var bodyWriter buf.Writer
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if destination.Network == net.Network_UDP {
bodyWriter = &PacketWriter{Writer: connWriter, Target: destination}
} else {
bodyWriter = connWriter
}
// write some request payload to buffer
if err = buf.CopyOnceTimeout(link.Reader, bodyWriter, time.Millisecond*100); err != nil && err != buf.ErrNotTimeoutReader && err != buf.ErrReadTimeout {
return errors.New("failed to write A request payload").Base(err).AtWarning()
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}
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// Flush; bufferWriter.WriteMultiBuffer now is bufferWriter.writer.WriteMultiBuffer
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if err = bufferWriter.SetBuffered(false); err != nil {
return errors.New("failed to flush payload").Base(err).AtWarning()
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}
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// Send header if not sent yet
if _, err = connWriter.Write([]byte{}); err != nil {
return err.(*errors.Error).AtWarning()
}
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if err = buf.Copy(link.Reader, bodyWriter, buf.UpdateActivity(timer)); err != nil {
return errors.New("failed to transfer request payload").Base(err).AtInfo()
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}
return nil
}
getResponse := func() error {
defer timer.SetTimeout(sessionPolicy.Timeouts.UplinkOnly)
var reader buf.Reader
if network == net.Network_UDP {
reader = &PacketReader{
Reader: conn,
}
} else {
reader = buf.NewReader(conn)
}
return buf.Copy(reader, link.Writer, buf.UpdateActivity(timer))
}
if newCtx != nil {
ctx = newCtx
}
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responseDoneAndCloseWriter := task.OnSuccess(getResponse, task.Close(link.Writer))
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if err := task.Run(ctx, postRequest, responseDoneAndCloseWriter); err != nil {
return errors.New("connection ends").Base(err)
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}
return nil
}
func init() {
common.Must(common.RegisterConfig((*ClientConfig)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
return NewClient(ctx, config.(*ClientConfig))
}))
}