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outbound.go
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outbound.go
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package outbound
//go:generate go run $GOPATH/src/v2ray.com/core/tools/generrorgen/main.go -pkg outbound -path Proxy,VMess,Outbound
import (
"context"
"runtime"
"time"
"v2ray.com/core/app"
"v2ray.com/core/app/log"
"v2ray.com/core/common"
"v2ray.com/core/common/buf"
"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"
)
// Handler is an outbound connection handler for VMess protocol.
type Handler struct {
serverList *protocol.ServerList
serverPicker protocol.ServerPicker
}
func New(ctx context.Context, config *Config) (*Handler, error) {
space := app.SpaceFromContext(ctx)
if space == nil {
return nil, newError("no space in context.")
}
serverList := protocol.NewServerList()
for _, rec := range config.Receiver {
serverList.AddServer(protocol.NewServerSpecFromPB(*rec))
}
handler := &Handler{
serverList: serverList,
serverPicker: protocol.NewRoundRobinServerPicker(serverList),
}
return handler, nil
}
// Process implements proxy.Outbound.Process().
func (v *Handler) Process(ctx context.Context, outboundRay ray.OutboundRay, dialer proxy.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()
target, ok := proxy.TargetFromContext(ctx)
if !ok {
return newError("target not specified").AtError()
}
log.Trace(newError("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 {
return newError("failed to get user account").Base(err).AtWarning()
}
account := rawAccount.(*vmess.InternalAccount)
request.Security = account.Security
if request.Security.Is(protocol.SecurityType_AES128_GCM) || request.Security.Is(protocol.SecurityType_NONE) || request.Security.Is(protocol.SecurityType_CHACHA20_POLY1305) {
request.Option.Set(protocol.RequestOptionChunkMasking)
}
input := outboundRay.OutboundInput()
output := outboundRay.OutboundOutput()
session := encoding.NewClientSession(protocol.DefaultIDHash)
ctx, timer := signal.CancelAfterInactivity(ctx, time.Minute*2)
requestDone := signal.ExecuteAsync(func() error {
writer := buf.NewBufferedWriter(conn)
session.EncodeRequestHeader(request, writer)
bodyWriter := session.EncodeRequestBody(request, writer)
firstPayload, err := input.ReadTimeout(time.Millisecond * 500)
if err != nil && err != buf.ErrReadTimeout {
return newError("failed to get first payload").Base(err)
}
if !firstPayload.IsEmpty() {
if err := bodyWriter.Write(firstPayload); err != nil {
return newError("failed to write first payload").Base(err)
}
firstPayload.Release()
}
if err := writer.SetBuffered(false); err != nil {
return err
}
if err := buf.Copy(timer, input, bodyWriter); err != nil {
return err
}
if request.Option.Has(protocol.RequestOptionChunkStream) {
if err := bodyWriter.Write(buf.NewMultiBuffer()); err != nil {
return err
}
}
return nil
})
responseDone := signal.ExecuteAsync(func() error {
defer output.Close()
reader := buf.NewBufferedReader(conn)
header, err := session.DecodeResponseHeader(reader)
if err != nil {
return err
}
v.handleCommand(rec.Destination(), header.Command)
reader.SetBuffered(false)
bodyReader := session.DecodeResponseBody(request, reader)
if err := buf.Copy(timer, bodyReader, output); err != nil {
return err
}
return nil
})
if err := signal.ErrorOrFinish2(ctx, requestDone, responseDone); err != nil {
return newError("connection ends").Base(err)
}
runtime.KeepAlive(timer)
return nil
}
func init() {
common.Must(common.RegisterConfig((*Config)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
return New(ctx, config.(*Config))
}))
}