client: set auth header to localhost for unix target

clientconn.go

@@ -245,6 +245,7 @@ func DialContext(ctx context.Context, target string, opts ...DialOption) (conn *
 
 	// Determine the resolver to use.
 	cc.parsedTarget = grpcutil.ParseTarget(cc.target)
+	unixScheme := strings.HasPrefix(cc.target, "unix:")
 	channelz.Infof(logger, cc.channelzID, "parsed scheme: %q", cc.parsedTarget.Scheme)
 	resolverBuilder := cc.getResolver(cc.parsedTarget.Scheme)
 	if resolverBuilder == nil {
@@ -267,6 +268,8 @@ func DialContext(ctx context.Context, target string, opts ...DialOption) (conn *
 		cc.authority = creds.Info().ServerName
 	} else if cc.dopts.insecure && cc.dopts.authority != "" {
 		cc.authority = cc.dopts.authority
+	} else if unixScheme {
+		cc.authority = "localhost"
 	} else {
 		// Use endpoint from "scheme://authority/endpoint" as the default
 		// authority for ClientConn.

test/authority_test.go

@@ -0,0 +1,102 @@
+/*
+ *
+ * Copyright 2020 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package test
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"testing"
+	"time"
+
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/metadata"
+	"google.golang.org/grpc/status"
+	testpb "google.golang.org/grpc/test/grpc_testing"
+)
+
+func runUnixTest(t *testing.T, address, target, expectedAuthority string) {
+	if err := os.RemoveAll(address); err != nil {
+		t.Fatalf("Error removing socket file %v: %v\n", address, err)
+	}
+	us := &stubServer{
+		emptyCall: func(ctx context.Context, in *testpb.Empty) (*testpb.Empty, error) {
+			if md, ok := metadata.FromIncomingContext(ctx); ok {
+				if auths, ok := md[":authority"]; ok {
+					if len(auths) < 1 {
+						return nil, status.Error(codes.InvalidArgument, "no authority header")
+					}
+					if auths[0] != expectedAuthority {
+						return nil, status.Error(codes.InvalidArgument, fmt.Sprintf("invalid authority header %v, expected %v", auths[0], expectedAuthority))
+					}
+					return &testpb.Empty{}, nil
+				}
+				return nil, status.Error(codes.InvalidArgument, "no authority header")
+			}
+			return nil, status.Error(codes.InvalidArgument, "failed to parse metadata")
+		},
+		network: "unix",
+		address: address,
+		target:  target,
+	}
+	if err := us.Start(nil); err != nil {
+		t.Fatalf("Error starting endpoint server: %v", err)
+		return
+	}
+	defer us.Stop()
+	ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
+	defer cancel()
+	_, err := us.client.EmptyCall(ctx, &testpb.Empty{})
+	if err != nil {
+		t.Errorf("us.client.EmptyCall(_, _) = _, %v; want _, nil", err)
+	}
+}
+
+func (s) TestUnix(t *testing.T) {
+	tests := []struct {
+		name      string
+		address   string
+		target    string
+		authority string
+	}{
+		{
+			name:      "Unix1",
+			address:   "sock.sock",
+			target:    "unix:sock.sock",
+			authority: "loclahost",
+		},
+		{
+			name:      "Unix2",
+			address:   "/tmp/sock.sock",
+			target:    "unix:/tmp/sock.sock",
+			authority: "loclahost",
+		},
+		{
+			name:      "Unix3",
+			address:   "/tmp/sock.sock",
+			target:    "unix:///tmp/sock.sock",
+			authority: "loclahost",
+		},
+	}
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			runUnixTest(t, test.address, test.target, test.authority)
+		})
+	}
+}

test/end2end_test.go

@@ -4991,6 +4991,10 @@ type stubServer struct {
 	cc     *grpc.ClientConn
 	s      *grpc.Server
 
+	network string
+	address string
+	target  string
+
 	addr string // address of listener
 
 	cleanups []func() // Lambdas executed in Stop(); populated by Start().
@@ -5015,7 +5019,11 @@ func (ss *stubServer) Start(sopts []grpc.ServerOption, dopts ...grpc.DialOption)
 	r := manual.NewBuilderWithScheme("whatever")
 	ss.r = r
 
-	lis, err := net.Listen("tcp", "localhost:0")
+	if ss.network == "" && ss.address == "" {
+		ss.network = "tcp"
+		ss.address = "localhost:0"
+	}
+	lis, err := net.Listen(ss.network, ss.address)
 	if err != nil {
 		return fmt.Errorf(`net.Listen("tcp", "localhost:0") = %v`, err)
 	}
@@ -5028,12 +5036,14 @@ func (ss *stubServer) Start(sopts []grpc.ServerOption, dopts ...grpc.DialOption)
 	ss.cleanups = append(ss.cleanups, s.Stop)
 	ss.s = s
 
-	target := ss.r.Scheme() + ":///" + ss.addr
+	if ss.target == "" {
+		ss.target = ss.r.Scheme() + ":///" + ss.addr
+	}
 
 	opts := append([]grpc.DialOption{grpc.WithInsecure(), grpc.WithResolvers(r)}, dopts...)
-	cc, err := grpc.Dial(target, opts...)
+	cc, err := grpc.Dial(ss.target, opts...)
 	if err != nil {
-		return fmt.Errorf("grpc.Dial(%q) = %v", target, err)
+		return fmt.Errorf("grpc.Dial(%q) = %v", ss.target, err)
 	}
 	ss.cc = cc
 	ss.r.UpdateState(resolver.State{Addresses: []resolver.Address{{Addr: ss.addr}}})