mirror of
https://github.com/v2fly/v2ray-core.git
synced 2024-12-23 02:26:49 -05:00
245 lines
7.5 KiB
Go
245 lines
7.5 KiB
Go
package outbound
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//go:generate go run github.com/v2fly/v2ray-core/v5/common/errors/errorgen
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import (
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"context"
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"crypto/hmac"
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"crypto/sha256"
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"hash/crc64"
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core "github.com/v2fly/v2ray-core/v5"
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"github.com/v2fly/v2ray-core/v5/common"
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"github.com/v2fly/v2ray-core/v5/common/buf"
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"github.com/v2fly/v2ray-core/v5/common/net"
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"github.com/v2fly/v2ray-core/v5/common/platform"
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"github.com/v2fly/v2ray-core/v5/common/protocol"
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"github.com/v2fly/v2ray-core/v5/common/retry"
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"github.com/v2fly/v2ray-core/v5/common/serial"
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"github.com/v2fly/v2ray-core/v5/common/session"
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"github.com/v2fly/v2ray-core/v5/common/signal"
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"github.com/v2fly/v2ray-core/v5/common/task"
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"github.com/v2fly/v2ray-core/v5/features/policy"
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"github.com/v2fly/v2ray-core/v5/proxy"
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"github.com/v2fly/v2ray-core/v5/proxy/vmess"
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"github.com/v2fly/v2ray-core/v5/proxy/vmess/encoding"
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"github.com/v2fly/v2ray-core/v5/transport"
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"github.com/v2fly/v2ray-core/v5/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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policyManager policy.Manager
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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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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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v := core.MustFromContext(ctx)
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handler := &Handler{
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serverList: serverList,
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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 handler, nil
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}
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// Process implements proxy.Outbound.Process().
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func (h *Handler) Process(ctx context.Context, link *transport.Link, dialer internet.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 = h.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()
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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").AtError()
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}
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target := outbound.Target
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newError("tunneling request to ", target, " via ", rec.Destination().NetAddr()).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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user := rec.PickUser()
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request := &protocol.RequestHeader{
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Version: encoding.Version,
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User: user,
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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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account := request.User.Account.(*vmess.MemoryAccount)
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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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if shouldEnablePadding(request.Security) && request.Option.Has(protocol.RequestOptionChunkMasking) {
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request.Option.Set(protocol.RequestOptionGlobalPadding)
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}
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if request.Security == protocol.SecurityType_ZERO {
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request.Security = protocol.SecurityType_NONE
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request.Option.Clear(protocol.RequestOptionChunkStream)
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request.Option.Clear(protocol.RequestOptionChunkMasking)
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}
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if account.AuthenticatedLengthExperiment {
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request.Option.Set(protocol.RequestOptionAuthenticatedLength)
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}
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input := link.Reader
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output := link.Writer
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isAEAD := false
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if !aeadDisabled && len(account.AlterIDs) == 0 {
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isAEAD = true
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}
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hashkdf := hmac.New(sha256.New, []byte("VMessBF"))
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hashkdf.Write(account.ID.Bytes())
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behaviorSeed := crc64.Checksum(hashkdf.Sum(nil), crc64.MakeTable(crc64.ISO))
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session := encoding.NewClientSession(ctx, isAEAD, protocol.DefaultIDHash, int64(behaviorSeed))
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sessionPolicy := h.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, err := session.EncodeRequestBody(request, writer)
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if err != nil {
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return newError("failed to start encoding").Base(err)
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}
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if err := buf.CopyOnceTimeout(input, bodyWriter, proxy.FirstPayloadTimeout); 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) && !account.NoTerminationSignal {
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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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h.handleCommand(rec.Destination(), header.Command)
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bodyReader, err := session.DecodeResponseBody(request, reader)
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if err != nil {
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return newError("failed to start encoding response").Base(err)
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}
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return buf.Copy(bodyReader, output, buf.UpdateActivity(timer))
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}
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responseDonePost := task.OnSuccess(responseDone, task.Close(output))
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if err := task.Run(ctx, 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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var (
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enablePadding = false
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aeadDisabled = false
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)
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func shouldEnablePadding(s protocol.SecurityType) bool {
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return enablePadding || s == protocol.SecurityType_AES128_GCM || s == protocol.SecurityType_CHACHA20_POLY1305 || s == protocol.SecurityType_AUTO
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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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common.Must(common.RegisterConfig((*SimplifiedConfig)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
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simplifiedClient := config.(*SimplifiedConfig)
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fullClient := &Config{Receiver: []*protocol.ServerEndpoint{
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{
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Address: simplifiedClient.Address,
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Port: simplifiedClient.Port,
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User: []*protocol.User{
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{
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Account: serial.ToTypedMessage(&vmess.Account{Id: simplifiedClient.Uuid}),
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},
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},
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},
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}}
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return common.CreateObject(ctx, fullClient)
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}))
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const defaultFlagValue = "NOT_DEFINED_AT_ALL"
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paddingValue := platform.NewEnvFlag("v2ray.vmess.padding").GetValue(func() string { return defaultFlagValue })
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if paddingValue != defaultFlagValue {
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enablePadding = true
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}
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isAeadDisabled := platform.NewEnvFlag("v2ray.vmess.aead.disabled").GetValue(func() string { return defaultFlagValue })
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if isAeadDisabled == "true" {
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aeadDisabled = true
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}
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}
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