Xray-core/transport/internet/grpc/hub.go

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package grpc
import (
"context"
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"time"
goreality "github.com/xtls/reality"
"github.com/xtls/xray-core/common"
"github.com/xtls/xray-core/common/net"
"github.com/xtls/xray-core/common/session"
"github.com/xtls/xray-core/transport/internet"
"github.com/xtls/xray-core/transport/internet/grpc/encoding"
"github.com/xtls/xray-core/transport/internet/reality"
"github.com/xtls/xray-core/transport/internet/tls"
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"google.golang.org/grpc"
"google.golang.org/grpc/credentials"
"google.golang.org/grpc/keepalive"
)
type Listener struct {
encoding.UnimplementedGRPCServiceServer
ctx context.Context
handler internet.ConnHandler
local net.Addr
config *Config
locker *internet.FileLocker // for unix domain socket
s *grpc.Server
}
func (l Listener) Tun(server encoding.GRPCService_TunServer) error {
tunCtx, cancel := context.WithCancel(l.ctx)
l.handler(encoding.NewHunkConn(server, cancel))
<-tunCtx.Done()
return nil
}
func (l Listener) TunMulti(server encoding.GRPCService_TunMultiServer) error {
tunCtx, cancel := context.WithCancel(l.ctx)
l.handler(encoding.NewMultiHunkConn(server, cancel))
<-tunCtx.Done()
return nil
}
func (l Listener) Close() error {
l.s.Stop()
return nil
}
func (l Listener) Addr() net.Addr {
return l.local
}
func Listen(ctx context.Context, address net.Address, port net.Port, settings *internet.MemoryStreamConfig, handler internet.ConnHandler) (internet.Listener, error) {
grpcSettings := settings.ProtocolSettings.(*Config)
var listener *Listener
if port == net.Port(0) { // unix
listener = &Listener{
handler: handler,
local: &net.UnixAddr{
Name: address.Domain(),
Net: "unix",
},
config: grpcSettings,
}
} else { // tcp
listener = &Listener{
handler: handler,
local: &net.TCPAddr{
IP: address.IP(),
Port: int(port),
},
config: grpcSettings,
}
}
listener.ctx = ctx
config := tls.ConfigFromStreamSettings(settings)
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var options []grpc.ServerOption
var s *grpc.Server
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if config != nil {
// gRPC server may silently ignore TLS errors
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options = append(options, grpc.Creds(credentials.NewTLS(config.GetTLSConfig(tls.WithNextProto("h2")))))
}
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if grpcSettings.IdleTimeout > 0 || grpcSettings.HealthCheckTimeout > 0 {
options = append(options, grpc.KeepaliveParams(keepalive.ServerParameters{
Time: time.Second * time.Duration(grpcSettings.IdleTimeout),
Timeout: time.Second * time.Duration(grpcSettings.HealthCheckTimeout),
}))
}
s = grpc.NewServer(options...)
listener.s = s
if settings.SocketSettings != nil && settings.SocketSettings.AcceptProxyProtocol {
newError("accepting PROXY protocol").AtWarning().WriteToLog(session.ExportIDToError(ctx))
}
go func() {
var streamListener net.Listener
var err error
if port == net.Port(0) { // unix
streamListener, err = internet.ListenSystem(ctx, &net.UnixAddr{
Name: address.Domain(),
Net: "unix",
}, settings.SocketSettings)
if err != nil {
newError("failed to listen on ", address).Base(err).AtError().WriteToLog(session.ExportIDToError(ctx))
return
}
locker := ctx.Value(address.Domain())
if locker != nil {
listener.locker = locker.(*internet.FileLocker)
}
} else { // tcp
streamListener, err = internet.ListenSystem(ctx, &net.TCPAddr{
IP: address.IP(),
Port: int(port),
}, settings.SocketSettings)
if err != nil {
newError("failed to listen on ", address, ":", port).Base(err).AtError().WriteToLog(session.ExportIDToError(ctx))
return
}
}
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newError("gRPC listen for service name `" + grpcSettings.getServiceName() + "` tun `" + grpcSettings.getTunStreamName() + "` multi tun `" + grpcSettings.getTunMultiStreamName() + "`").AtDebug().WriteToLog()
encoding.RegisterGRPCServiceServerX(s, listener, grpcSettings.getServiceName(), grpcSettings.getTunStreamName(), grpcSettings.getTunMultiStreamName())
if config := reality.ConfigFromStreamSettings(settings); config != nil {
streamListener = goreality.NewListener(streamListener, config.GetREALITYConfig())
}
if err = s.Serve(streamListener); err != nil {
newError("Listener for gRPC ended").Base(err).WriteToLog()
}
}()
return listener, nil
}
func init() {
common.Must(internet.RegisterTransportListener(protocolName, Listen))
}