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// +build !confonly
package outbound
//go:generate errorgen
import (
"context"
"time"
"v2ray.com/core"
"v2ray.com/core/common"
"v2ray.com/core/common/buf"
"v2ray.com/core/common/net"
"v2ray.com/core/common/platform"
"v2ray.com/core/common/protocol"
"v2ray.com/core/common/retry"
"v2ray.com/core/common/session"
"v2ray.com/core/common/signal"
"v2ray.com/core/common/task"
"v2ray.com/core/features/policy"
"v2ray.com/core/proxy/vmess"
"v2ray.com/core/proxy/vmess/encoding"
"v2ray.com/core/transport"
"v2ray.com/core/transport/internet"
)
// Handler is an outbound connection handler for VMess protocol.
type Handler struct {
serverList *protocol.ServerList
serverPicker protocol.ServerPicker
policyManager policy.Manager
}
// New creates a new VMess outbound handler.
func New(ctx context.Context, config *Config) (*Handler, error) {
serverList := protocol.NewServerList()
for _, rec := range config.Receiver {
s, err := protocol.NewServerSpecFromPB(*rec)
if err != nil {
return nil, newError("failed to parse server spec").Base(err)
}
serverList.AddServer(s)
}
v := core.MustFromContext(ctx)
handler := &Handler{
serverList: serverList,
serverPicker: protocol.NewRoundRobinServerPicker(serverList),
policyManager: v.GetFeature(policy.ManagerType()).(policy.Manager),
}
return handler, nil
}
// Process implements proxy.Outbound.Process().
func (v *Handler) Process(ctx context.Context, link *transport.Link, dialer internet.Dialer) error {
var rec *protocol.ServerSpec
var conn internet.Connection
err := retry.ExponentialBackoff(5, 200).On(func() error {
rec = v.serverPicker.PickServer()
rawConn, err := dialer.Dial(ctx, rec.Destination())
if err != nil {
return err
}
conn = rawConn
return nil
})
if err != nil {
return newError("failed to find an available destination").Base(err).AtWarning()
}
defer conn.Close() //nolint: errcheck
outbound := session.OutboundFromContext(ctx)
if outbound == nil || !outbound.Target.IsValid() {
return newError("target not specified").AtError()
}
target := outbound.Target
newError("tunneling request to ", target, " via ", rec.Destination()).WriteToLog(session.ExportIDToError(ctx))
command := protocol.RequestCommandTCP
if target.Network == net.Network_UDP {
command = protocol.RequestCommandUDP
}
if target.Address.Family().IsDomain() && target.Address.Domain() == "v1.mux.cool" {
command = protocol.RequestCommandMux
}
request := &protocol.RequestHeader{
Version: encoding.Version,
User: rec.PickUser(),
Command: command,
Address: target.Address,
Port: target.Port,
Option: protocol.RequestOptionChunkStream,
}
account := request.User.Account.(*vmess.MemoryAccount)
request.Security = account.Security
if request.Security == protocol.SecurityType_AES128_GCM || request.Security == protocol.SecurityType_NONE || request.Security == protocol.SecurityType_CHACHA20_POLY1305 {
request.Option.Set(protocol.RequestOptionChunkMasking)
}
if shouldEnablePadding(request.Security) && request.Option.Has(protocol.RequestOptionChunkMasking) {
request.Option.Set(protocol.RequestOptionGlobalPadding)
}
input := link.Reader
output := link.Writer
session := encoding.NewClientSession(protocol.DefaultIDHash)
sessionPolicy := v.policyManager.ForLevel(request.User.Level)
ctx, cancel := context.WithCancel(ctx)
timer := signal.CancelAfterInactivity(ctx, cancel, sessionPolicy.Timeouts.ConnectionIdle)
requestDone := func() error {
defer timer.SetTimeout(sessionPolicy.Timeouts.DownlinkOnly)
writer := buf.NewBufferedWriter(buf.NewWriter(conn))
if err := session.EncodeRequestHeader(request, writer); err != nil {
return newError("failed to encode request").Base(err).AtWarning()
}
bodyWriter := session.EncodeRequestBody(request, writer)
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)
}
if err := writer.SetBuffered(false); err != nil {
return err
}
if err := buf.Copy(input, bodyWriter, buf.UpdateActivity(timer)); err != nil {
return err
}
if request.Option.Has(protocol.RequestOptionChunkStream) {
if err := bodyWriter.WriteMultiBuffer(buf.MultiBuffer{}); err != nil {
return err
}
}
return nil
}
responseDone := func() error {
defer timer.SetTimeout(sessionPolicy.Timeouts.UplinkOnly)
reader := &buf.BufferedReader{Reader: buf.NewReader(conn)}
header, err := session.DecodeResponseHeader(reader)
if err != nil {
return newError("failed to read header").Base(err)
}
v.handleCommand(rec.Destination(), header.Command)
bodyReader := session.DecodeResponseBody(request, reader)
return buf.Copy(bodyReader, output, buf.UpdateActivity(timer))
}
var responseDonePost = task.OnSuccess(responseDone, task.Close(output))
if err := task.Run(ctx, requestDone, responseDonePost); err != nil {
return newError("connection ends").Base(err)
}
return nil
}
var (
enablePadding = false
)
func shouldEnablePadding(s protocol.SecurityType) bool {
return enablePadding || s == protocol.SecurityType_AES128_GCM || s == protocol.SecurityType_CHACHA20_POLY1305 || s == protocol.SecurityType_AUTO
}
func init() {
common.Must(common.RegisterConfig((*Config)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
return New(ctx, config.(*Config))
}))
const defaultFlagValue = "NOT_DEFINED_AT_ALL"
paddingValue := platform.NewEnvFlag("v2ray.vmess.padding").GetValue(func() string { return defaultFlagValue })
if paddingValue != defaultFlagValue {
enablePadding = true
}
}
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