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outbound.go
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outbound.go
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package outbound
import (
"context"
"time"
"v2ray.com/core/app"
"v2ray.com/core/common"
"v2ray.com/core/common/buf"
"v2ray.com/core/common/bufio"
"v2ray.com/core/common/errors"
"v2ray.com/core/common/log"
"v2ray.com/core/common/net"
"v2ray.com/core/common/protocol"
"v2ray.com/core/common/retry"
"v2ray.com/core/common/signal"
"v2ray.com/core/proxy"
"v2ray.com/core/proxy/vmess"
"v2ray.com/core/proxy/vmess/encoding"
"v2ray.com/core/transport/internet"
"v2ray.com/core/transport/ray"
)
// VMessOutboundHandler is an outbound connection handler for VMess protocol.
type VMessOutboundHandler struct {
serverList *protocol.ServerList
serverPicker protocol.ServerPicker
meta *proxy.OutboundHandlerMeta
}
func New(ctx context.Context, config *Config) (*VMessOutboundHandler, error) {
space := app.SpaceFromContext(ctx)
if space == nil {
return nil, errors.New("VMess|Outbound: No space in context.")
}
meta := proxy.OutboundMetaFromContext(ctx)
if meta == nil {
return nil, errors.New("VMess|Outbound: No outbound meta in context.")
}
serverList := protocol.NewServerList()
for _, rec := range config.Receiver {
serverList.AddServer(protocol.NewServerSpecFromPB(*rec))
}
handler := &VMessOutboundHandler{
serverList: serverList,
serverPicker: protocol.NewRoundRobinServerPicker(serverList),
meta: meta,
}
return handler, nil
}
// Dispatch implements OutboundHandler.Dispatch().
func (v *VMessOutboundHandler) Dispatch(target net.Destination, outboundRay ray.OutboundRay) {
var rec *protocol.ServerSpec
var conn internet.Connection
err := retry.ExponentialBackoff(5, 100).On(func() error {
rec = v.serverPicker.PickServer()
rawConn, err := internet.Dial(v.meta.Address, rec.Destination(), v.meta.GetDialerOptions())
if err != nil {
return err
}
conn = rawConn
return nil
})
if err != nil {
log.Warning("VMess|Outbound: Failed to find an available destination:", err)
return
}
log.Info("VMess|Outbound: Tunneling request to ", target, " via ", rec.Destination())
command := protocol.RequestCommandTCP
if target.Network == net.Network_UDP {
command = protocol.RequestCommandUDP
}
request := &protocol.RequestHeader{
Version: encoding.Version,
User: rec.PickUser(),
Command: command,
Address: target.Address,
Port: target.Port,
Option: protocol.RequestOptionChunkStream,
}
rawAccount, err := request.User.GetTypedAccount()
if err != nil {
log.Warning("VMess|Outbound: Failed to get user account: ", err)
}
account := rawAccount.(*vmess.InternalAccount)
request.Security = account.Security
defer conn.Close()
conn.SetReusable(true)
if conn.Reusable() { // Conn reuse may be disabled on transportation layer
request.Option.Set(protocol.RequestOptionConnectionReuse)
}
input := outboundRay.OutboundInput()
output := outboundRay.OutboundOutput()
session := encoding.NewClientSession(protocol.DefaultIDHash)
requestDone := signal.ExecuteAsync(func() error {
writer := bufio.NewWriter(conn)
session.EncodeRequestHeader(request, writer)
bodyWriter := session.EncodeRequestBody(request, writer)
firstPayload, err := input.ReadTimeout(time.Millisecond * 500)
if err != nil && err != ray.ErrReadTimeout {
return errors.Base(err).Message("VMess|Outbound: Failed to get first payload.")
}
if !firstPayload.IsEmpty() {
if err := bodyWriter.Write(firstPayload); err != nil {
return errors.Base(err).Message("VMess|Outbound: Failed to write first payload.")
}
firstPayload.Release()
}
writer.SetBuffered(false)
if err := buf.PipeUntilEOF(input, bodyWriter); err != nil {
return err
}
if request.Option.Has(protocol.RequestOptionChunkStream) {
if err := bodyWriter.Write(buf.NewLocal(8)); err != nil {
return err
}
}
return nil
})
responseDone := signal.ExecuteAsync(func() error {
defer output.Close()
reader := bufio.NewReader(conn)
header, err := session.DecodeResponseHeader(reader)
if err != nil {
return err
}
v.handleCommand(rec.Destination(), header.Command)
conn.SetReusable(header.Option.Has(protocol.ResponseOptionConnectionReuse))
reader.SetBuffered(false)
bodyReader := session.DecodeResponseBody(request, reader)
if err := buf.PipeUntilEOF(bodyReader, output); err != nil {
return err
}
return nil
})
if err := signal.ErrorOrFinish2(requestDone, responseDone); err != nil {
log.Info("VMess|Outbound: Connection ending with ", err)
conn.SetReusable(false)
input.CloseError()
output.CloseError()
}
return
}
func init() {
common.Must(common.RegisterConfig((*Config)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
return New(ctx, config.(*Config))
}))
}