mirror of
https://github.com/XTLS/Xray-core.git
synced 2024-09-11 21:46:23 +00:00
218 lines
6.3 KiB
Go
218 lines
6.3 KiB
Go
package trojan
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import (
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"context"
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"syscall"
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"time"
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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/platform"
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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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core "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/transport"
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"github.com/xtls/xray-core/transport/internet"
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"github.com/xtls/xray-core/transport/internet/xtls"
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)
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// Client is a inbound handler for trojan protocol
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type Client struct {
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serverPicker protocol.ServerPicker
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policyManager policy.Manager
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}
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// NewClient create a new trojan client.
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func NewClient(ctx context.Context, config *ClientConfig) (*Client, error) {
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serverList := protocol.NewServerList()
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for _, rec := range config.Server {
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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)
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}
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serverList.AddServer(s)
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}
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if serverList.Size() == 0 {
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return nil, newError("0 server")
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}
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v := core.MustFromContext(ctx)
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client := &Client{
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serverPicker: protocol.NewRoundRobinServerPicker(serverList),
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policyManager: v.GetFeature(policy.ManagerType()).(policy.Manager),
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}
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return client, nil
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}
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// Process implements OutboundHandler.Process().
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func (c *Client) Process(ctx context.Context, link *transport.Link, dialer internet.Dialer) error {
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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")
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}
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destination := outbound.Target
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network := destination.Network
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var server *protocol.ServerSpec
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var conn internet.Connection
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err := retry.ExponentialBackoff(5, 100).On(func() error {
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server = c.serverPicker.PickServer()
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rawConn, err := dialer.Dial(ctx, server.Destination())
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if err != nil {
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return err
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}
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conn = rawConn
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return nil
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})
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if err != nil {
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return newError("failed to find an available destination").AtWarning().Base(err)
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}
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newError("tunneling request to ", destination, " via ", server.Destination()).WriteToLog(session.ExportIDToError(ctx))
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defer conn.Close()
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iConn := conn
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statConn, ok := iConn.(*internet.StatCouterConnection)
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if ok {
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iConn = statConn.Connection
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}
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user := server.PickUser()
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account, ok := user.Account.(*MemoryAccount)
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if !ok {
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return newError("user account is not valid")
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}
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connWriter := &ConnWriter{
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Flow: account.Flow,
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}
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var rawConn syscall.RawConn
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var sctx context.Context
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allowUDP443 := false
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switch connWriter.Flow {
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case XRO + "-udp443", XRD + "-udp443", XRS + "-udp443":
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allowUDP443 = true
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connWriter.Flow = connWriter.Flow[:16]
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fallthrough
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case XRO, XRD, XRS:
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if destination.Address.Family().IsDomain() && destination.Address.Domain() == muxCoolAddress {
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return newError(connWriter.Flow + " doesn't support Mux").AtWarning()
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}
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if destination.Network == net.Network_UDP {
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if !allowUDP443 && destination.Port == 443 {
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return newError(connWriter.Flow + " stopped UDP/443").AtInfo()
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}
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connWriter.Flow = ""
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} else { // enable XTLS only if making TCP request
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if xtlsConn, ok := iConn.(*xtls.Conn); ok {
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xtlsConn.RPRX = true
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xtlsConn.SHOW = xtls_show
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xtlsConn.MARK = "XTLS"
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if connWriter.Flow == XRS {
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sctx = ctx
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connWriter.Flow = XRD
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}
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if connWriter.Flow == XRD {
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xtlsConn.DirectMode = true
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if sc, ok := xtlsConn.Connection.(syscall.Conn); ok {
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rawConn, _ = sc.SyscallConn()
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}
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}
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} else {
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return newError(`failed to use ` + connWriter.Flow + `, maybe "security" is not "xtls"`).AtWarning()
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}
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}
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default:
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if _, ok := iConn.(*xtls.Conn); ok {
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panic(`To avoid misunderstanding, you must fill in Trojan "flow" when using XTLS.`)
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}
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}
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sessionPolicy := c.policyManager.ForLevel(user.Level)
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ctx, cancel := context.WithCancel(ctx)
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timer := signal.CancelAfterInactivity(ctx, cancel, sessionPolicy.Timeouts.ConnectionIdle)
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postRequest := func() error {
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defer timer.SetTimeout(sessionPolicy.Timeouts.DownlinkOnly)
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var bodyWriter buf.Writer
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bufferWriter := buf.NewBufferedWriter(buf.NewWriter(conn))
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connWriter.Writer = bufferWriter
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connWriter.Target = destination
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connWriter.Account = account
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if destination.Network == net.Network_UDP {
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bodyWriter = &PacketWriter{Writer: connWriter, Target: destination}
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} else {
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bodyWriter = connWriter
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}
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// write some request payload to buffer
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if err = buf.CopyOnceTimeout(link.Reader, bodyWriter, time.Millisecond*100); err != nil && err != buf.ErrNotTimeoutReader && err != buf.ErrReadTimeout {
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return newError("failed to write A request payload").Base(err).AtWarning()
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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 flush payload").Base(err).AtWarning()
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}
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if err = buf.Copy(link.Reader, bodyWriter, buf.UpdateActivity(timer)); err != nil {
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return newError("failed to transfer request payload").Base(err).AtInfo()
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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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var reader buf.Reader
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if network == net.Network_UDP {
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reader = &PacketReader{
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Reader: conn,
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}
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} else {
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reader = buf.NewReader(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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return ReadV(reader, link.Writer, timer, iConn.(*xtls.Conn), rawConn, counter, sctx)
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}
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return buf.Copy(reader, link.Writer, buf.UpdateActivity(timer))
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}
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var responseDoneAndCloseWriter = task.OnSuccess(getResponse, task.Close(link.Writer))
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if err := task.Run(ctx, postRequest, responseDoneAndCloseWriter); err != nil {
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return newError("connection ends").Base(err)
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}
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return nil
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}
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func init() {
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common.Must(common.RegisterConfig((*ClientConfig)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
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return NewClient(ctx, config.(*ClientConfig))
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}))
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const defaultFlagValue = "NOT_DEFINED_AT_ALL"
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xtlsShow := platform.NewEnvFlag("xray.trojan.xtls.show").GetValue(func() string { return defaultFlagValue })
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if xtlsShow == "true" {
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xtls_show = true
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}
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}
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