Check in gVisor.

PiperOrigin-RevId: 194583126
Change-Id: Ica1d8821a90f74e7e745962d71801c598c652463

1 files changed, 391 insertions, 0 deletions

diff --git a/pkg/p9/messages_test.go b/pkg/p9/messages_test.go
new file mode 100644
index 000000000..f353755f1
--- /dev/null
+++ b/pkg/p9/messages_test.go
@@ -0,0 +1,391 @@
+// Copyright 2018 Google Inc.
+//
+// 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
+//
+//     http://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 p9
+
+import (
+	"reflect"
+	"testing"
+)
+
+func TestEncodeDecode(t *testing.T) {
+	objs := []encoder{
+		&QID{
+			Type:    1,
+			Version: 2,
+			Path:    3,
+		},
+		&FSStat{
+			Type:            1,
+			BlockSize:       2,
+			Blocks:          3,
+			BlocksFree:      4,
+			BlocksAvailable: 5,
+			Files:           6,
+			FilesFree:       7,
+			FSID:            8,
+			NameLength:      9,
+		},
+		&AttrMask{
+			Mode:        true,
+			NLink:       true,
+			UID:         true,
+			GID:         true,
+			RDev:        true,
+			ATime:       true,
+			MTime:       true,
+			CTime:       true,
+			INo:         true,
+			Size:        true,
+			Blocks:      true,
+			BTime:       true,
+			Gen:         true,
+			DataVersion: true,
+		},
+		&Attr{
+			Mode:             Exec,
+			UID:              2,
+			GID:              3,
+			NLink:            4,
+			RDev:             5,
+			Size:             6,
+			BlockSize:        7,
+			Blocks:           8,
+			ATimeSeconds:     9,
+			ATimeNanoSeconds: 10,
+			MTimeSeconds:     11,
+			MTimeNanoSeconds: 12,
+			CTimeSeconds:     13,
+			CTimeNanoSeconds: 14,
+			BTimeSeconds:     15,
+			BTimeNanoSeconds: 16,
+			Gen:              17,
+			DataVersion:      18,
+		},
+		&SetAttrMask{
+			Permissions:        true,
+			UID:                true,
+			GID:                true,
+			Size:               true,
+			ATime:              true,
+			MTime:              true,
+			CTime:              true,
+			ATimeNotSystemTime: true,
+			MTimeNotSystemTime: true,
+		},
+		&SetAttr{
+			Permissions:      1,
+			UID:              2,
+			GID:              3,
+			Size:             4,
+			ATimeSeconds:     5,
+			ATimeNanoSeconds: 6,
+			MTimeSeconds:     7,
+			MTimeNanoSeconds: 8,
+		},
+		&Dirent{
+			QID:    QID{Type: 1},
+			Offset: 2,
+			Type:   3,
+			Name:   "a",
+		},
+		&Rlerror{
+			Error: 1,
+		},
+		&Tstatfs{
+			FID: 1,
+		},
+		&Rstatfs{
+			FSStat: FSStat{Type: 1},
+		},
+		&Tlopen{
+			FID:   1,
+			Flags: WriteOnly,
+		},
+		&Rlopen{
+			QID:    QID{Type: 1},
+			IoUnit: 2,
+		},
+		&Tlconnect{
+			FID: 1,
+		},
+		&Rlconnect{},
+		&Tlcreate{
+			FID:         1,
+			Name:        "a",
+			OpenFlags:   2,
+			Permissions: 3,
+			GID:         4,
+		},
+		&Rlcreate{
+			Rlopen{QID: QID{Type: 1}},
+		},
+		&Tsymlink{
+			Directory: 1,
+			Name:      "a",
+			Target:    "b",
+			GID:       2,
+		},
+		&Rsymlink{
+			QID: QID{Type: 1},
+		},
+		&Tmknod{
+			Directory:   1,
+			Name:        "a",
+			Permissions: 2,
+			Major:       3,
+			Minor:       4,
+			GID:         5,
+		},
+		&Rmknod{
+			QID: QID{Type: 1},
+		},
+		&Trename{
+			FID:       1,
+			Directory: 2,
+			Name:      "a",
+		},
+		&Rrename{},
+		&Treadlink{
+			FID: 1,
+		},
+		&Rreadlink{
+			Target: "a",
+		},
+		&Tgetattr{
+			FID:      1,
+			AttrMask: AttrMask{Mode: true},
+		},
+		&Rgetattr{
+			Valid: AttrMask{Mode: true},
+			QID:   QID{Type: 1},
+			Attr:  Attr{Mode: Write},
+		},
+		&Tsetattr{
+			FID:     1,
+			Valid:   SetAttrMask{Permissions: true},
+			SetAttr: SetAttr{Permissions: Write},
+		},
+		&Rsetattr{},
+		&Txattrwalk{
+			FID:    1,
+			NewFID: 2,
+			Name:   "a",
+		},
+		&Rxattrwalk{
+			Size: 1,
+		},
+		&Treaddir{
+			Directory: 1,
+			Offset:    2,
+			Count:     3,
+		},
+		&Rreaddir{
+			// Count must be sufficient to encode a dirent.
+			Count:   0x18,
+			Entries: []Dirent{{QID: QID{Type: 2}}},
+		},
+		&Tfsync{
+			FID: 1,
+		},
+		&Rfsync{},
+		&Tlink{
+			Directory: 1,
+			Target:    2,
+			Name:      "a",
+		},
+		&Rlink{},
+		&Tmkdir{
+			Directory:   1,
+			Name:        "a",
+			Permissions: 2,
+			GID:         3,
+		},
+		&Rmkdir{
+			QID: QID{Type: 1},
+		},
+		&Trenameat{
+			OldDirectory: 1,
+			OldName:      "a",
+			NewDirectory: 2,
+			NewName:      "b",
+		},
+		&Rrenameat{},
+		&Tunlinkat{
+			Directory: 1,
+			Name:      "a",
+			Flags:     2,
+		},
+		&Runlinkat{},
+		&Tversion{
+			MSize:   1,
+			Version: "a",
+		},
+		&Rversion{
+			MSize:   1,
+			Version: "a",
+		},
+		&Tauth{
+			AuthenticationFID: 1,
+			UserName:          "a",
+			AttachName:        "b",
+			UID:               2,
+		},
+		&Rauth{
+			QID: QID{Type: 1},
+		},
+		&Tattach{
+			FID:  1,
+			Auth: Tauth{AuthenticationFID: 2},
+		},
+		&Rattach{
+			QID: QID{Type: 1},
+		},
+		&Tflush{
+			OldTag: 1,
+		},
+		&Rflush{},
+		&Twalk{
+			FID:    1,
+			NewFID: 2,
+			Names:  []string{"a"},
+		},
+		&Rwalk{
+			QIDs: []QID{{Type: 1}},
+		},
+		&Tread{
+			FID:    1,
+			Offset: 2,
+			Count:  3,
+		},
+		&Rread{
+			Data: []byte{'a'},
+		},
+		&Twrite{
+			FID:    1,
+			Offset: 2,
+			Data:   []byte{'a'},
+		},
+		&Rwrite{
+			Count: 1,
+		},
+		&Tclunk{
+			FID: 1,
+		},
+		&Rclunk{},
+		&Tremove{
+			FID: 1,
+		},
+		&Rremove{},
+		&Tflushf{
+			FID: 1,
+		},
+		&Rflushf{},
+		&Twalkgetattr{
+			FID:    1,
+			NewFID: 2,
+			Names:  []string{"a"},
+		},
+		&Rwalkgetattr{
+			QIDs:  []QID{{Type: 1}},
+			Valid: AttrMask{Mode: true},
+			Attr:  Attr{Mode: Write},
+		},
+		&Tucreate{
+			Tlcreate: Tlcreate{
+				FID:         1,
+				Name:        "a",
+				OpenFlags:   2,
+				Permissions: 3,
+				GID:         4,
+			},
+			UID: 5,
+		},
+		&Rucreate{
+			Rlcreate{Rlopen{QID: QID{Type: 1}}},
+		},
+		&Tumkdir{
+			Tmkdir: Tmkdir{
+				Directory:   1,
+				Name:        "a",
+				Permissions: 2,
+				GID:         3,
+			},
+			UID: 4,
+		},
+		&Rumkdir{
+			Rmkdir{QID: QID{Type: 1}},
+		},
+		&Tusymlink{
+			Tsymlink: Tsymlink{
+				Directory: 1,
+				Name:      "a",
+				Target:    "b",
+				GID:       2,
+			},
+			UID: 3,
+		},
+		&Rusymlink{
+			Rsymlink{QID: QID{Type: 1}},
+		},
+		&Tumknod{
+			Tmknod: Tmknod{
+				Directory:   1,
+				Name:        "a",
+				Permissions: 2,
+				Major:       3,
+				Minor:       4,
+				GID:         5,
+			},
+			UID: 6,
+		},
+		&Rumknod{
+			Rmknod{QID: QID{Type: 1}},
+		},
+	}
+
+	for _, enc := range objs {
+		// Encode the original.
+		data := make([]byte, initialBufferLength)
+		buf := buffer{data: data[:0]}
+		enc.Encode(&buf)
+
+		// Create a new object, same as the first.
+		enc2 := reflect.New(reflect.ValueOf(enc).Elem().Type()).Interface().(encoder)
+		buf2 := buffer{data: buf.data}
+
+		// To be fair, we need to add any payloads (directly).
+		if pl, ok := enc.(payloader); ok {
+			enc2.(payloader).SetPayload(pl.Payload())
+		}
+
+		// And any file payloads (directly).
+		if fl, ok := enc.(filer); ok {
+			enc2.(filer).SetFilePayload(fl.FilePayload())
+		}
+
+		// Mark sure it was okay.
+		enc2.Decode(&buf2)
+		if buf2.isOverrun() {
+			t.Errorf("object %#v->%#v got overrun on decode", enc, enc2)
+			continue
+		}
+
+		// Check that they are equal.
+		if !reflect.DeepEqual(enc, enc2) {
+			t.Errorf("object %#v and %#v differ", enc, enc2)
+			continue
+		}
+	}
+}