mirror of
https://github.com/net-byte/vtun
synced 2024-03-14 10:50:03 +08:00
92 lines
2.2 KiB
Go
92 lines
2.2 KiB
Go
package grpc
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import (
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"log"
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"net"
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"time"
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"github.com/net-byte/vtun/grpc/proto"
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"google.golang.org/grpc"
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"google.golang.org/grpc/credentials"
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"github.com/net-byte/vtun/common/cache"
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"github.com/net-byte/vtun/common/cipher"
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"github.com/net-byte/vtun/common/config"
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"github.com/net-byte/vtun/common/netutil"
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"github.com/net-byte/vtun/tun"
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"github.com/songgao/water"
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)
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// The StreamService is the implementation of the StreamServer interface
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type StreamService struct {
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proto.UnimplementedGrpcServeServer
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config config.Config
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iface *water.Interface
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}
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// Tunnel implements the StreamServer interface
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func (s *StreamService) Tunnel(srv proto.GrpcServe_TunnelServer) error {
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toServer(srv, s.config, s.iface)
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return nil
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}
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// StartServer starts the grpc server
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func StartServer(config config.Config) {
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log.Printf("vtun grpc server started on %v", config.LocalAddr)
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iface := tun.CreateTun(config)
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ln, err := net.Listen("tcp", config.LocalAddr)
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if err != nil {
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log.Panic(err)
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}
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defer ln.Close()
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creds, err := credentials.NewServerTLSFromFile(config.TLSCertificateFilePath, config.TLSCertificateKeyFilePath)
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if err != nil {
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log.Panic(err)
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}
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grpcServer := grpc.NewServer(grpc.Creds(creds))
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proto.RegisterGrpcServeServer(grpcServer, &StreamService{config: config, iface: iface})
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go toClient(config, iface)
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err = grpcServer.Serve(ln)
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if err != nil {
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log.Fatalf("grpc server error: %v", err)
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}
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}
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// toClient sends packets from tun to grpc
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func toClient(config config.Config, iface *water.Interface) {
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packet := make([]byte, config.MTU)
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for {
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n, err := iface.Read(packet)
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if err != nil || n == 0 {
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continue
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}
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b := packet[:n]
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if key := netutil.GetDstKey(b); key != "" {
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if v, ok := cache.GetCache().Get(key); ok {
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if config.Obfs {
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b = cipher.XOR(b)
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}
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v.(proto.GrpcServe_TunnelServer).Send(&proto.PacketData{Data: b})
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}
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}
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}
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}
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// toServer sends packets from grpc to tun
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func toServer(srv proto.GrpcServe_TunnelServer, config config.Config, iface *water.Interface) {
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for {
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packet, err := srv.Recv()
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if err != nil {
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break
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}
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b := packet.Data[:]
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if config.Obfs {
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b = cipher.XOR(b)
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}
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if key := netutil.GetSrcKey(b); key != "" {
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cache.GetCache().Set(key, srv, 10*time.Minute)
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iface.Write(b)
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}
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}
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}
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