v2ray-core/proxy/vmess/outbound/outbound.go

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package outbound
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//go:generate go run $GOPATH/src/v2ray.com/core/tools/generrorgen/main.go -pkg outbound -path Proxy,VMess,Outbound
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import (
"context"
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"time"
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"v2ray.com/core/app"
"v2ray.com/core/app/log"
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"v2ray.com/core/common"
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"v2ray.com/core/common/buf"
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"v2ray.com/core/common/net"
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"v2ray.com/core/common/protocol"
"v2ray.com/core/common/retry"
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"v2ray.com/core/common/signal"
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"v2ray.com/core/proxy"
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"v2ray.com/core/proxy/vmess"
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"v2ray.com/core/proxy/vmess/encoding"
"v2ray.com/core/transport/internet"
"v2ray.com/core/transport/ray"
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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
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}
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func New(ctx context.Context, config *Config) (*Handler, error) {
space := app.SpaceFromContext(ctx)
if space == nil {
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return nil, newError("no space in context.")
}
serverList := protocol.NewServerList()
for _, rec := range config.Receiver {
serverList.AddServer(protocol.NewServerSpecFromPB(*rec))
}
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handler := &Handler{
serverList: serverList,
serverPicker: protocol.NewRoundRobinServerPicker(serverList),
}
return handler, nil
}
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// Process implements proxy.Outbound.Process().
func (v *Handler) Process(ctx context.Context, outboundRay ray.OutboundRay, dialer proxy.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 = v.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()
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target, ok := proxy.TargetFromContext(ctx)
if !ok {
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return newError("target not specified").AtError()
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}
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log.Trace(newError("tunneling request to ", target, " via ", rec.Destination()))
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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.com" {
// command = protocol.RequestCommandMux
//}
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request := &protocol.RequestHeader{
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Version: encoding.Version,
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User: rec.PickUser(),
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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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rawAccount, err := request.User.GetTypedAccount()
if err != nil {
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return newError("failed to get user account").Base(err).AtWarning()
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}
account := rawAccount.(*vmess.InternalAccount)
request.Security = account.Security
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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)
}
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input := outboundRay.OutboundInput()
output := outboundRay.OutboundOutput()
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session := encoding.NewClientSession(protocol.DefaultIDHash)
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ctx, cancel := context.WithCancel(ctx)
timer := signal.CancelAfterInactivity(ctx, cancel, time.Minute*5)
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requestDone := signal.ExecuteAsync(func() error {
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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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firstPayload, err := input.ReadTimeout(time.Millisecond * 500)
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if err != nil && err != buf.ErrReadTimeout {
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return newError("failed to get first payload").Base(err)
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}
if !firstPayload.IsEmpty() {
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if err := bodyWriter.WriteMultiBuffer(firstPayload); err != nil {
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return newError("failed to write first payload").Base(err)
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}
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firstPayload.Release()
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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) {
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if err := bodyWriter.WriteMultiBuffer(buf.MultiBuffer{}); err != nil {
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return err
}
}
return nil
})
responseDone := signal.ExecuteAsync(func() error {
defer output.Close()
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reader := buf.NewBufferedReader(buf.NewReader(conn))
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header, err := session.DecodeResponseHeader(reader)
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if err != nil {
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return err
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}
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v.handleCommand(rec.Destination(), header.Command)
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reader.SetBuffered(false)
bodyReader := session.DecodeResponseBody(request, reader)
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if err := buf.Copy(bodyReader, output, buf.UpdateActivity(timer)); err != nil {
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return err
}
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return nil
})
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if err := signal.ErrorOrFinish2(ctx, requestDone, responseDone); 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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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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}