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outbound.go
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outbound.go
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package outbound
import (
"v2ray.com/core/app"
"v2ray.com/core/common"
"v2ray.com/core/common/buf"
"v2ray.com/core/common/bufio"
"v2ray.com/core/common/log"
v2net "v2ray.com/core/common/net"
"v2ray.com/core/common/protocol"
"v2ray.com/core/common/retry"
"v2ray.com/core/common/serial"
"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
}
// Dispatch implements OutboundHandler.Dispatch().
func (v *VMessOutboundHandler) Dispatch(target v2net.Destination, payload *buf.Buffer, ray ray.OutboundRay) {
defer payload.Release()
defer ray.OutboundInput().ForceClose()
defer ray.OutboundOutput().Close()
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 == v2net.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 := ray.OutboundInput()
output := ray.OutboundOutput()
session := encoding.NewClientSession(protocol.DefaultIDHash)
requestDone := signal.ExecuteAsync(func() error {
defer input.ForceClose()
writer := bufio.NewWriter(conn)
defer writer.Release()
session.EncodeRequestHeader(request, writer)
bodyWriter := session.EncodeRequestBody(request, writer)
defer bodyWriter.Release()
if !payload.IsEmpty() {
if err := bodyWriter.Write(payload); err != nil {
return err
}
}
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)
defer reader.Release()
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)
defer bodyReader.Release()
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)
}
return
}
// Factory is a proxy factory for VMess outbound.
type Factory struct{}
func (v *Factory) StreamCapability() v2net.NetworkList {
return v2net.NetworkList{
Network: []v2net.Network{v2net.Network_TCP, v2net.Network_KCP, v2net.Network_WebSocket},
}
}
func (v *Factory) Create(space app.Space, rawConfig interface{}, meta *proxy.OutboundHandlerMeta) (proxy.OutboundHandler, error) {
vOutConfig := rawConfig.(*Config)
serverList := protocol.NewServerList()
for _, rec := range vOutConfig.Receiver {
serverList.AddServer(protocol.NewServerSpecFromPB(*rec))
}
handler := &VMessOutboundHandler{
serverList: serverList,
serverPicker: protocol.NewRoundRobinServerPicker(serverList),
meta: meta,
}
return handler, nil
}
func init() {
common.Must(proxy.RegisterOutboundHandlerCreator(serial.GetMessageType(new(Config)), new(Factory)))
}