initial commit

dialer/grpc/dialer.go

@@ -0,0 +1,113 @@
+package grpc
+
+import (
+	"context"
+	"net"
+	"sync"
+	"time"
+
+	"github.com/go-gost/gost/v3/pkg/dialer"
+	md "github.com/go-gost/gost/v3/pkg/metadata"
+	"github.com/go-gost/gost/v3/pkg/registry"
+	pb "github.com/go-gost/x/internal/util/grpc/proto"
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/backoff"
+	"google.golang.org/grpc/credentials"
+	"google.golang.org/grpc/credentials/insecure"
+)
+
+func init() {
+	registry.DialerRegistry().Register("grpc", NewDialer)
+}
+
+type grpcDialer struct {
+	clients     map[string]pb.GostTunelClient
+	clientMutex sync.Mutex
+	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),
+		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
+		}
+		if h, _, _ := net.SplitHostPort(host); h != "" {
+			host = h
+		}
+
+		grpcOpts := []grpc.DialOption{
+			// grpc.WithBlock(),
+			grpc.WithContextDialer(func(c context.Context, s string) (net.Conn, error) {
+				return options.NetDialer.Dial(c, "tcp", s)
+			}),
+			grpc.WithAuthority(host),
+			grpc.WithConnectParams(grpc.ConnectParams{
+				Backoff:           backoff.DefaultConfig,
+				MinConnectTimeout: 10 * time.Second,
+			}),
+			grpc.FailOnNonTempDialError(true),
+		}
+		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.options.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
+}