add grpc tunnel

pkg/dialer/grpc/conn.go

@@ -0,0 +1,92 @@
+package grpc
+
+import (
+	"errors"
+	"io"
+	"net"
+	"time"
+
+	pb "github.com/go-gost/gost/pkg/common/util/grpc/proto"
+)
+
+type conn struct {
+	c          pb.GostTunel_TunnelClient
+	rb         []byte
+	localAddr  net.Addr
+	remoteAddr net.Addr
+	closed     chan struct{}
+}
+
+func (c *conn) Read(b []byte) (n int, err error) {
+	select {
+	case <-c.c.Context().Done():
+		err = c.c.Context().Err()
+		return
+	case <-c.closed:
+		err = io.ErrClosedPipe
+		return
+	default:
+	}
+
+	if len(c.rb) == 0 {
+		chunk, err := c.c.Recv()
+		if err != nil {
+			return 0, err
+		}
+		c.rb = chunk.Data
+	}
+
+	n = copy(b, c.rb)
+	c.rb = c.rb[n:]
+	return
+}
+
+func (c *conn) Write(b []byte) (n int, err error) {
+	select {
+	case <-c.c.Context().Done():
+		err = c.c.Context().Err()
+		return
+	case <-c.closed:
+		err = io.ErrClosedPipe
+		return
+	default:
+	}
+
+	if err = c.c.Send(&pb.Chunk{
+		Data: b,
+	}); err != nil {
+		return
+	}
+	n = len(b)
+	return
+}
+
+func (c *conn) Close() error {
+	select {
+	case <-c.closed:
+	default:
+		close(c.closed)
+	}
+
+	return nil
+}
+
+func (c *conn) LocalAddr() net.Addr {
+	return c.localAddr
+}
+
+func (c *conn) RemoteAddr() net.Addr {
+	return c.remoteAddr
+}
+
+func (c *conn) SetDeadline(t time.Time) error {
+	return &net.OpError{Op: "set", Net: "grpc", Source: nil, Addr: nil, Err: errors.New("deadline not supported")}
+}
+
+func (c *conn) SetReadDeadline(t time.Time) error {
+	return &net.OpError{Op: "set", Net: "grpc", Source: nil, Addr: nil, Err: errors.New("deadline not supported")}
+}
+
+func (c *conn) SetWriteDeadline(t time.Time) error {
+	return &net.OpError{Op: "set", Net: "grpc", Source: nil, Addr: nil, Err: errors.New("deadline not supported")}
+}

pkg/dialer/grpc/dialer.go

@@ -0,0 +1,140 @@
+package grpc
+
+import (
+	"context"
+	"net"
+	"sync"
+	"time"
+
+	pb "github.com/go-gost/gost/pkg/common/util/grpc/proto"
+	"github.com/go-gost/gost/pkg/dialer"
+	"github.com/go-gost/gost/pkg/logger"
+	md "github.com/go-gost/gost/pkg/metadata"
+	"github.com/go-gost/gost/pkg/registry"
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/backoff"
+	"google.golang.org/grpc/credentials"
+	"google.golang.org/grpc/credentials/insecure"
+)
+
+func init() {
+	registry.RegisterDialer("grpc", NewDialer)
+}
+
+type grpcDialer struct {
+	clients     map[string]pb.GostTunelClient
+	clientMutex sync.Mutex
+	logger      logger.Logger
+	md          metadata
+	options     dialer.Options
+}
+
+func NewDialer(opts ...dialer.Option) dialer.Dialer {
+	options := dialer.Options{}
+	for _, opt := range opts {
+		opt(&options)
+	}
+
+	return &grpcDialer{
+		clients: make(map[string]pb.GostTunelClient),
+		logger:  options.Logger,
+		options: options,
+	}
+}
+
+func (d *grpcDialer) Init(md md.Metadata) (err error) {
+	return d.parseMetadata(md)
+}
+
+// Multiplex implements dialer.Multiplexer interface.
+func (d *grpcDialer) Multiplex() bool {
+	return true
+}
+
+func (d *grpcDialer) Dial(ctx context.Context, addr string, opts ...dialer.DialOption) (net.Conn, error) {
+	remoteAddr, err := net.ResolveTCPAddr("tcp", addr)
+	if err != nil {
+		return nil, err
+	}
+
+	d.clientMutex.Lock()
+	defer d.clientMutex.Unlock()
+
+	client, ok := d.clients[addr]
+	if !ok {
+		var options dialer.DialOptions
+		for _, opt := range opts {
+			opt(&options)
+		}
+
+		host := d.md.host
+		if host == "" {
+			host = options.Host
+		}
+
+		grpcOpts := []grpc.DialOption{
+			grpc.WithBlock(),
+			grpc.WithContextDialer(func(c context.Context, s string) (net.Conn, error) {
+				return d.dial(ctx, "tcp", s, &options)
+			}),
+			grpc.WithAuthority(host),
+			grpc.WithConnectParams(grpc.ConnectParams{
+				Backoff:           backoff.DefaultConfig,
+				MinConnectTimeout: 10 * time.Second,
+			}),
+		}
+		if !d.md.insecure {
+			grpcOpts = append(grpcOpts, grpc.WithTransportCredentials(credentials.NewTLS(d.options.TLSConfig)))
+		} else {
+			grpcOpts = append(grpcOpts, grpc.WithTransportCredentials(insecure.NewCredentials()))
+		}
+
+		cc, err := grpc.DialContext(ctx, addr, grpcOpts...)
+		if err != nil {
+			d.logger.Error(err)
+			return nil, err
+		}
+		client = pb.NewGostTunelClient(cc)
+		d.clients[addr] = client
+	}
+
+	cli, err := client.Tunnel(ctx)
+	if err != nil {
+		return nil, err
+	}
+
+	return &conn{
+		c:          cli,
+		localAddr:  &net.TCPAddr{},
+		remoteAddr: remoteAddr,
+		closed:     make(chan struct{}),
+	}, nil
+}
+
+func (d *grpcDialer) dial(ctx context.Context, network, addr string, opts *dialer.DialOptions) (net.Conn, error) {
+	dial := opts.DialFunc
+	if dial != nil {
+		conn, err := dial(ctx, addr)
+		if err != nil {
+			d.logger.Error(err)
+		} else {
+			d.logger.WithFields(map[string]interface{}{
+				"src": conn.LocalAddr().String(),
+				"dst": addr,
+			}).Debug("dial with dial func")
+		}
+		return conn, err
+	}
+
+	var netd net.Dialer
+	conn, err := netd.DialContext(ctx, network, addr)
+	if err != nil {
+		d.logger.Error(err)
+	} else {
+		d.logger.WithFields(map[string]interface{}{
+			"src": conn.LocalAddr().String(),
+			"dst": addr,
+		}).Debugf("dial direct %s/%s", addr, network)
+	}
+	return conn, err
+}

pkg/dialer/grpc/metadata.go

@@ -0,0 +1,22 @@
+package grpc
+
+import (
+	mdata "github.com/go-gost/gost/pkg/metadata"
+)
+
+type metadata struct {
+	insecure bool
+	host     string
+}
+
+func (d *grpcDialer) parseMetadata(md mdata.Metadata) (err error) {
+	const (
+		insecure = "grpcInsecure"
+		host     = "host"
+	)
+
+	d.md.insecure = mdata.GetBool(md, insecure)
+	d.md.host = mdata.GetString(md, host)
+
+	return
+}