1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
|
// Copyright 2021 The gVisor 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
//
// 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 lisafs
import (
"bytes"
"math/rand"
"reflect"
"testing"
"golang.org/x/sys/unix"
"gvisor.dev/gvisor/pkg/marshal"
"gvisor.dev/gvisor/pkg/sync"
"gvisor.dev/gvisor/pkg/unet"
)
func runSocketTest(t *testing.T, fun1 func(*sockCommunicator), fun2 func(*sockCommunicator)) {
sock1, sock2, err := unet.SocketPair(false)
if err != nil {
t.Fatalf("socketpair got err %v expected nil", err)
}
defer sock1.Close()
defer sock2.Close()
var testWg sync.WaitGroup
testWg.Add(2)
go func() {
fun1(newSockComm(sock1))
testWg.Done()
}()
go func() {
fun2(newSockComm(sock2))
testWg.Done()
}()
testWg.Wait()
}
func TestReadWrite(t *testing.T) {
// Create random data to send.
n := 10000
data := make([]byte, n)
if _, err := rand.Read(data); err != nil {
t.Fatalf("rand.Read(data) failed: %v", err)
}
runSocketTest(t, func(comm *sockCommunicator) {
// Scatter that data into two parts using Iovecs while sending.
mid := n / 2
if err := writeTo(comm.sock, [][]byte{data[:mid], data[mid:]}, n, nil); err != nil {
t.Errorf("writeTo socket failed: %v", err)
}
}, func(comm *sockCommunicator) {
gotData := make([]byte, n)
if _, err := readFrom(comm.sock, gotData, 0); err != nil {
t.Fatalf("reading from socket failed: %v", err)
}
// Make sure we got the right data.
if res := bytes.Compare(data, gotData); res != 0 {
t.Errorf("data received differs from data sent, want = %v, got = %v", data, gotData)
}
})
}
func TestFDDonation(t *testing.T) {
n := 10
data := make([]byte, n)
if _, err := rand.Read(data); err != nil {
t.Fatalf("rand.Read(data) failed: %v", err)
}
// Try donating FDs to these files.
path1 := "/dev/null"
path2 := "/dev"
path3 := "/dev/random"
runSocketTest(t, func(comm *sockCommunicator) {
devNullFD, err := unix.Open(path1, unix.O_RDONLY, 0)
defer unix.Close(devNullFD)
if err != nil {
t.Fatalf("open(%s) failed: %v", path1, err)
}
devFD, err := unix.Open(path2, unix.O_RDONLY, 0)
defer unix.Close(devFD)
if err != nil {
t.Fatalf("open(%s) failed: %v", path2, err)
}
devRandomFD, err := unix.Open(path3, unix.O_RDONLY, 0)
defer unix.Close(devRandomFD)
if err != nil {
t.Fatalf("open(%s) failed: %v", path2, err)
}
if err := writeTo(comm.sock, [][]byte{data}, n, []int{devNullFD, devFD, devRandomFD}); err != nil {
t.Errorf("writeTo socket failed: %v", err)
}
}, func(comm *sockCommunicator) {
gotData := make([]byte, n)
fds, err := readFrom(comm.sock, gotData, 3)
if err != nil {
t.Fatalf("reading from socket failed: %v", err)
}
defer closeFDs(fds[:])
if res := bytes.Compare(data, gotData); res != 0 {
t.Errorf("data received differs from data sent, want = %v, got = %v", data, gotData)
}
if len(fds) != 3 {
t.Fatalf("wanted 3 FD, got %d", len(fds))
}
// Check that the FDs actually point to the correct file.
compareFDWithFile(t, fds[0], path1)
compareFDWithFile(t, fds[1], path2)
compareFDWithFile(t, fds[2], path3)
})
}
func compareFDWithFile(t *testing.T, fd int, path string) {
var want unix.Stat_t
if err := unix.Stat(path, &want); err != nil {
t.Fatalf("stat(%s) failed: %v", path, err)
}
var got unix.Stat_t
if err := unix.Fstat(fd, &got); err != nil {
t.Fatalf("fstat on donated FD failed: %v", err)
}
if got.Ino != want.Ino || got.Dev != want.Dev {
t.Errorf("FD does not point to %s, want = %+v, got = %+v", path, want, got)
}
}
func testSndMsg(comm *sockCommunicator, m MID, msg marshal.Marshallable) error {
var payloadLen uint32
if msg != nil {
payloadLen = uint32(msg.SizeBytes())
msg.MarshalUnsafe(comm.PayloadBuf(payloadLen))
}
return comm.sndPrepopulatedMsg(m, payloadLen, nil)
}
func TestSndRcvMessage(t *testing.T) {
req := &MsgSimple{}
req.Randomize()
reqM := MID(1)
// Create a massive random response.
var resp MsgDynamic
resp.Randomize(100)
respM := MID(2)
runSocketTest(t, func(comm *sockCommunicator) {
if err := testSndMsg(comm, reqM, req); err != nil {
t.Errorf("writeMessageTo failed: %v", err)
}
checkMessageReceive(t, comm, respM, &resp)
}, func(comm *sockCommunicator) {
checkMessageReceive(t, comm, reqM, req)
if err := testSndMsg(comm, respM, &resp); err != nil {
t.Errorf("writeMessageTo failed: %v", err)
}
})
}
func TestSndRcvMessageNoPayload(t *testing.T) {
reqM := MID(1)
respM := MID(2)
runSocketTest(t, func(comm *sockCommunicator) {
if err := testSndMsg(comm, reqM, nil); err != nil {
t.Errorf("writeMessageTo failed: %v", err)
}
checkMessageReceive(t, comm, respM, nil)
}, func(comm *sockCommunicator) {
checkMessageReceive(t, comm, reqM, nil)
if err := testSndMsg(comm, respM, nil); err != nil {
t.Errorf("writeMessageTo failed: %v", err)
}
})
}
func checkMessageReceive(t *testing.T, comm *sockCommunicator, wantM MID, wantMsg marshal.Marshallable) {
gotM, payloadLen, err := comm.rcvMsg(0)
if err != nil {
t.Fatalf("readMessageFrom failed: %v", err)
}
if gotM != wantM {
t.Errorf("got incorrect message ID: got = %d, want = %d", gotM, wantM)
}
if wantMsg == nil {
if payloadLen != 0 {
t.Errorf("no payload expect but got %d bytes", payloadLen)
}
} else {
gotMsg := reflect.New(reflect.ValueOf(wantMsg).Elem().Type()).Interface().(marshal.Marshallable)
gotMsg.UnmarshalUnsafe(comm.PayloadBuf(payloadLen))
if !reflect.DeepEqual(wantMsg, gotMsg) {
t.Errorf("msg differs: want = %+v, got = %+v", wantMsg, gotMsg)
}
}
}
|
