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v2fly/proxy/vmess/outbound/outbound.go

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package outbound
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//go:generate go run github.com/v2fly/v2ray-core/v5/common/errors/errorgen
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import (
"context"
"crypto/hmac"
"crypto/sha256"
"hash/crc64"
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"time"
core "github.com/v2fly/v2ray-core/v5"
"github.com/v2fly/v2ray-core/v5/common"
"github.com/v2fly/v2ray-core/v5/common/buf"
"github.com/v2fly/v2ray-core/v5/common/net"
"github.com/v2fly/v2ray-core/v5/common/platform"
"github.com/v2fly/v2ray-core/v5/common/protocol"
"github.com/v2fly/v2ray-core/v5/common/retry"
"github.com/v2fly/v2ray-core/v5/common/serial"
"github.com/v2fly/v2ray-core/v5/common/session"
"github.com/v2fly/v2ray-core/v5/common/signal"
"github.com/v2fly/v2ray-core/v5/common/task"
"github.com/v2fly/v2ray-core/v5/features/policy"
"github.com/v2fly/v2ray-core/v5/proxy/vmess"
"github.com/v2fly/v2ray-core/v5/proxy/vmess/encoding"
"github.com/v2fly/v2ray-core/v5/transport"
"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.
type Handler struct {
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serverList *protocol.ServerList
serverPicker protocol.ServerPicker
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) {
serverList := protocol.NewServerList()
for _, rec := range config.Receiver {
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s, err := protocol.NewServerSpecFromPB(rec)
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if err != nil {
return nil, newError("failed to parse server spec").Base(err)
}
serverList.AddServer(s)
}
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v := core.MustFromContext(ctx)
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handler := &Handler{
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serverList: serverList,
serverPicker: protocol.NewRoundRobinServerPicker(serverList),
policyManager: v.GetFeature(policy.ManagerType()).(policy.Manager),
}
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return handler, nil
}
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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()
rawConn, err := dialer.Dial(ctx, rec.Destination())
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if err != nil {
return err
}
conn = rawConn
return nil
})
if err != nil {
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return newError("failed to find an available destination").Base(err).AtWarning()
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}
defer conn.Close()
outbound := session.OutboundFromContext(ctx)
if outbound == nil || !outbound.Target.IsValid() {
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return newError("target not specified").AtError()
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}
target := outbound.Target
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" {
command = protocol.RequestCommandMux
}
user := rec.PickUser()
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request := &protocol.RequestHeader{
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Version: encoding.Version,
User: user,
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Command: command,
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Address: target.Address,
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
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)
}
if shouldEnablePadding(request.Security) && request.Option.Has(protocol.RequestOptionChunkMasking) {
request.Option.Set(protocol.RequestOptionGlobalPadding)
}
if request.Security == protocol.SecurityType_ZERO {
request.Security = protocol.SecurityType_NONE
request.Option.Clear(protocol.RequestOptionChunkStream)
request.Option.Clear(protocol.RequestOptionChunkMasking)
}
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if account.AuthenticatedLengthExperiment {
request.Option.Set(protocol.RequestOptionAuthenticatedLength)
}
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input := link.Reader
output := link.Writer
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isAEAD := false
if !aeadDisabled && len(account.AlterIDs) == 0 {
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isAEAD = true
}
hashkdf := hmac.New(sha256.New, []byte("VMessBF"))
hashkdf.Write(account.ID.Bytes())
behaviorSeed := crc64.Checksum(hashkdf.Sum(nil), crc64.MakeTable(crc64.ISO))
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)
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))
if err := session.EncodeRequestHeader(request, writer); err != nil {
return newError("failed to encode request").Base(err).AtWarning()
}
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bodyWriter := session.EncodeRequestBody(request, writer)
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if err := buf.CopyOnceTimeout(input, bodyWriter, time.Millisecond*100); err != nil && err != buf.ErrNotTimeoutReader && err != buf.ErrReadTimeout {
return newError("failed to write first payload").Base(err)
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}
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if err := writer.SetBuffered(false); err != nil {
return err
}
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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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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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return nil
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}
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responseDone := func() error {
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 := session.DecodeResponseBody(request, reader)
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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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}
return nil
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}
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var (
enablePadding = false
aeadDisabled = false
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)
func shouldEnablePadding(s protocol.SecurityType) bool {
return enablePadding || s == protocol.SecurityType_AES128_GCM || s == protocol.SecurityType_CHACHA20_POLY1305 || s == protocol.SecurityType_AUTO
}
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func init() {
common.Must(common.RegisterConfig((*Config)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
return New(ctx, config.(*Config))
}))
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common.Must(common.RegisterConfig((*SimplifiedConfig)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
simplifiedClient := config.(*SimplifiedConfig)
fullClient := &Config{Receiver: []*protocol.ServerEndpoint{
{
Address: simplifiedClient.Address,
Port: simplifiedClient.Port,
User: []*protocol.User{
{
Account: serial.ToTypedMessage(&vmess.Account{Id: simplifiedClient.Uuid}),
},
},
},
}}
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 })
if paddingValue != defaultFlagValue {
enablePadding = true
}
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isAeadDisabled := platform.NewEnvFlag("v2ray.vmess.aead.disabled").GetValue(func() string { return defaultFlagValue })
if isAeadDisabled == "true" {
aeadDisabled = true
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}
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}