2015-12-04 06:07:32 -05:00
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package outbound
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2015-09-10 18:24:18 -04:00
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2017-12-02 19:04:57 -05:00
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//go:generate go run $GOPATH/src/v2ray.com/core/common/errors/errorgen/main.go -pkg outbound -path Proxy,VMess,Outbound
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2017-04-08 19:43:25 -04:00
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2015-09-10 18:24:18 -04:00
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import (
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"context"
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"time"
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"v2ray.com/core/common/session"
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"v2ray.com/core/common/task"
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"v2ray.com/core"
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"v2ray.com/core/common"
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"v2ray.com/core/common/buf"
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"v2ray.com/core/common/net"
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"v2ray.com/core/common/protocol"
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"v2ray.com/core/common/retry"
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"v2ray.com/core/common/signal"
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"v2ray.com/core/proxy"
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"v2ray.com/core/proxy/vmess"
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"v2ray.com/core/proxy/vmess/encoding"
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"v2ray.com/core/transport/internet"
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)
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// Handler is an outbound connection handler for VMess 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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v *core.Instance
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}
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// New creates a new VMess 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.Receiver {
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serverList.AddServer(protocol.NewServerSpecFromPB(*rec))
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}
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handler := &Handler{
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serverList: serverList,
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serverPicker: protocol.NewRoundRobinServerPicker(serverList),
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v: core.MustFromContext(ctx),
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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 (v *Handler) Process(ctx context.Context, link *core.Link, dialer proxy.Dialer) error {
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var rec *protocol.ServerSpec
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var conn internet.Connection
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err := retry.ExponentialBackoff(5, 200).On(func() error {
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rec = v.serverPicker.PickServer()
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rawConn, 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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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").Base(err).AtWarning()
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}
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defer conn.Close() //nolint: errcheck
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target, ok := proxy.TargetFromContext(ctx)
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if !ok {
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return newError("target not specified").AtError()
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}
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newError("tunneling request to ", target, " via ", rec.Destination()).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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Option: protocol.RequestOptionChunkStream,
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}
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rawAccount, err := request.User.GetTypedAccount()
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if err != nil {
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return newError("failed to get user account").Base(err).AtWarning()
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}
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account := rawAccount.(*vmess.InternalAccount)
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request.Security = account.Security
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if request.Security == protocol.SecurityType_AES128_GCM || request.Security == protocol.SecurityType_NONE || request.Security == protocol.SecurityType_CHACHA20_POLY1305 {
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request.Option.Set(protocol.RequestOptionChunkMasking)
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}
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input := link.Reader
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output := link.Writer
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session := encoding.NewClientSession(protocol.DefaultIDHash)
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sessionPolicy := v.v.PolicyManager().ForLevel(request.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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requestDone := func() error {
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defer timer.SetTimeout(sessionPolicy.Timeouts.DownlinkOnly)
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writer := buf.NewBufferedWriter(buf.NewWriter(conn))
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if err := session.EncodeRequestHeader(request, writer); err != nil {
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return newError("failed to encode request").Base(err).AtWarning()
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}
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bodyWriter := session.EncodeRequestBody(request, writer)
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if err := buf.CopyOnceTimeout(input, bodyWriter, time.Millisecond*500); err != nil && err != buf.ErrNotTimeoutReader && err != buf.ErrReadTimeout {
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return newError("failed to write first payload").Base(err)
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}
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if err := writer.SetBuffered(false); err != nil {
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return err
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}
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if err := buf.Copy(input, bodyWriter, buf.UpdateActivity(timer)); err != nil {
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return err
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}
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if request.Option.Has(protocol.RequestOptionChunkStream) {
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if err := bodyWriter.WriteMultiBuffer(buf.MultiBuffer{}); err != nil {
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return err
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}
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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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defer timer.SetTimeout(sessionPolicy.Timeouts.UplinkOnly)
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reader := &buf.BufferedReader{Reader: buf.NewReader(conn)}
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header, err := session.DecodeResponseHeader(reader)
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if err != nil {
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return newError("failed to read header").Base(err)
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}
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v.handleCommand(rec.Destination(), header.Command)
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reader.Direct = true
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bodyReader := session.DecodeResponseBody(request, reader)
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return buf.Copy(bodyReader, output, buf.UpdateActivity(timer))
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}
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var responseDonePost = task.Single(responseDone, task.OnSuccess(task.Close(output)))
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if err := task.Run(task.WithContext(ctx), task.Parallel(requestDone, responseDonePost))(); 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((*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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