mirror of
https://github.com/net-byte/vtun
synced 2024-03-14 10:50:03 +08:00
109 lines
2.6 KiB
Go
109 lines
2.6 KiB
Go
package grpc
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import (
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"context"
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"crypto/tls"
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"log"
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"time"
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"github.com/golang/snappy"
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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/counter"
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"github.com/net-byte/vtun/common/netutil"
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"github.com/net-byte/water"
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)
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// StartClient starts the grpc client
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func StartClient(iface *water.Interface, config config.Config) {
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log.Println("vtun grpc client started")
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go tunToGrpc(config, iface)
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tlsconfig := &tls.Config{
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InsecureSkipVerify: config.TLSInsecureSkipVerify,
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}
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if config.TLSSni != "" {
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tlsconfig.ServerName = config.TLSSni
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}
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creds := credentials.NewTLS(tlsconfig)
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for {
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conn, err := grpc.Dial(config.ServerAddr, grpc.WithBlock(), grpc.WithTransportCredentials(creds))
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if err != nil {
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time.Sleep(3 * time.Second)
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netutil.PrintErr(err, config.Verbose)
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continue
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}
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streamClient := proto.NewGrpcServeClient(conn)
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stream, err := streamClient.Tunnel(context.Background())
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if err != nil {
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conn.Close()
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netutil.PrintErr(err, config.Verbose)
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continue
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}
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cache.GetCache().Set("grpcconn", stream, 24*time.Hour)
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grpcToTun(config, stream, iface)
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cache.GetCache().Delete("grpcconn")
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conn.Close()
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}
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}
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// tunToGrpc sends packets from tun to grpc
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func tunToGrpc(config config.Config, iface *water.Interface) {
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packet := make([]byte, config.BufferSize)
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for {
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n, err := iface.Read(packet)
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if err != nil {
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netutil.PrintErr(err, config.Verbose)
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break
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}
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if v, ok := cache.GetCache().Get("grpcconn"); ok {
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b := packet[:n]
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if config.Obfs {
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b = cipher.XOR(b)
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}
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if config.Compress {
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b = snappy.Encode(nil, b)
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}
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grpcconn := v.(proto.GrpcServe_TunnelClient)
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err = grpcconn.Send(&proto.PacketData{Data: b})
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if err != nil {
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netutil.PrintErr(err, config.Verbose)
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continue
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}
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counter.IncrWrittenBytes(n)
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}
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}
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}
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// grpcToTun sends packets from grpc to tun
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func grpcToTun(config config.Config, stream proto.GrpcServe_TunnelClient, iface *water.Interface) {
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for {
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packet, err := stream.Recv()
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if err != nil {
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netutil.PrintErr(err, config.Verbose)
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break
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}
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b := packet.Data[:]
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if config.Compress {
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b, err = snappy.Decode(nil, b)
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if err != nil {
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netutil.PrintErr(err, config.Verbose)
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break
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}
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}
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if config.Obfs {
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b = cipher.XOR(b)
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}
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_, err = iface.Write(b)
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if err != nil {
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netutil.PrintErr(err, config.Verbose)
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break
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}
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counter.IncrReadBytes(len(b))
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}
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}
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