summaryrefslogtreecommitdiff
path: root/tests/test_helpers/helpers.go
blob: 47517a65a7062576df67c42fd58e896f22cfd30e (plain)
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
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
package test_helpers

import (
	"bytes"
	"crypto/md5"
	"encoding/hex"
	"encoding/json"
	"fmt"
	"io"
	"io/ioutil"
	"log"
	"net"
	"os"
	"os/exec"
	"path/filepath"
	"syscall"
	"testing"
	"time"

	"github.com/rfjakob/gocryptfs/internal/ctlsock"
	"github.com/rfjakob/gocryptfs/internal/nametransform"
)

// TmpDir will be created inside this directory
const testParentDir = "/tmp/gocryptfs-test-parent"

// GocryptfsBinary is the assumed path to the gocryptfs build.
const GocryptfsBinary = "../../gocryptfs"

// UnmountScript is the fusermount/umount compatibility wrapper script
const UnmountScript = "../fuse-unmount.bash"

// X255 contains 255 uppercase "X". This can be used as a maximum-length filename.
var X255 string

// TmpDir is a unique temporary directory. "go test" runs package tests in parallel. We create a
// unique TmpDir in init() so the tests do not interfere.
var TmpDir string

// DefaultPlainDir is TmpDir + "/default-plain"
var DefaultPlainDir string

// DefaultCipherDir is TmpDir + "/default-cipher"
var DefaultCipherDir string

func init() {
	X255 = string(bytes.Repeat([]byte("X"), 255))

	os.MkdirAll(testParentDir, 0700)
	var err error
	TmpDir, err = ioutil.TempDir(testParentDir, "")
	if err != nil {
		panic(err)
	}
	DefaultPlainDir = TmpDir + "/default-plain"
	DefaultCipherDir = TmpDir + "/default-cipher"
}

// ResetTmpDir deletes TmpDir, create new dir tree:
//
// TmpDir
// |-- DefaultPlainDir
// *-- DefaultCipherDir
//     *-- gocryptfs.diriv
func ResetTmpDir(createDirIV bool) {
	// Try to unmount and delete everything
	entries, err := ioutil.ReadDir(TmpDir)
	if err == nil {
		for _, e := range entries {
			d := filepath.Join(TmpDir, e.Name())
			err = os.Remove(d)
			if err != nil {
				pe := err.(*os.PathError)
				if pe.Err == syscall.EBUSY {
					if testing.Verbose() {
						fmt.Printf("Remove failed: %v. Maybe still mounted?\n", pe)
					}
					err = UnmountErr(d)
					if err != nil {
						panic(err)
					}
				} else if pe.Err != syscall.ENOTEMPTY {
					panic("Unhandled error: " + pe.Err.Error())
				}
				err = os.RemoveAll(d)
				if err != nil {
					panic(err)
				}
			}
		}
	}
	err = os.Mkdir(DefaultPlainDir, 0700)
	if err != nil {
		panic(err)
	}
	err = os.Mkdir(DefaultCipherDir, 0700)
	if err != nil {
		panic(err)
	}
	if createDirIV {
		err = nametransform.WriteDirIV(nil, DefaultCipherDir)
		if err != nil {
			panic(err)
		}
	}
}

// InitFS calls "gocryptfs -init" on a new directory in TmpDir, passing
// "extraArgs" in addition to useful defaults.
//
// The returned cipherdir has NO trailing slash.
func InitFS(t *testing.T, extraArgs ...string) string {
	dir, err := ioutil.TempDir(TmpDir, "")
	if err != nil {
		if t != nil {
			t.Fatal(err)
		} else {
			log.Panic(err)
		}
	}
	args := []string{"-q", "-init", "-extpass", "echo test", "-scryptn=10"}
	args = append(args, extraArgs...)
	args = append(args, dir)

	cmd := exec.Command(GocryptfsBinary, args...)
	cmd.Stdout = os.Stdout
	cmd.Stderr = os.Stderr

	err = cmd.Run()
	if err != nil {
		if t != nil {
			t.Fatalf("InitFS with args %v failed: %v", args, err)
		} else {
			log.Panic(err)
		}
	}

	return dir
}

// Mount CIPHERDIR "c" on PLAINDIR "p"
// Creates "p" if it does not exist.
func Mount(c string, p string, showOutput bool, extraArgs ...string) error {
	var args []string
	args = append(args, "-q", "-wpanic", "-nosyslog")
	args = append(args, extraArgs...)
	//args = append(args, "-fusedebug")
	//args = append(args, "-d")
	args = append(args, c)
	args = append(args, p)

	if _, err := os.Stat(p); err != nil {
		err = os.Mkdir(p, 0777)
		if err != nil {
			return err
		}
	}

	cmd := exec.Command(GocryptfsBinary, args...)
	if showOutput {
		// The Go test logic waits for our stdout to close, and when we share
		// it with the subprocess, it will wait for it to close it as well.
		// Use an intermediate pipe so the tests do not hang when unmouting
		// fails.
		pr, pw, err := os.Pipe()
		if err != nil {
			return err
		}
		cmd.Stderr = pw
		cmd.Stdout = pw
		go func() { io.Copy(os.Stdout, pr) }()
	}

	return cmd.Run()
}

// MountOrExit calls Mount() and exits on failure.
func MountOrExit(c string, p string, extraArgs ...string) {
	err := Mount(c, p, true, extraArgs...)
	if err != nil {
		fmt.Printf("mount failed: %v", err)
		os.Exit(1)
	}
}

// MountOrFatal calls Mount() and calls t.Fatal() on failure.
func MountOrFatal(t *testing.T, c string, p string, extraArgs ...string) {
	err := Mount(c, p, true, extraArgs...)
	if err != nil {
		t.Fatal(fmt.Errorf("mount failed: %v", err))
	}
}

// UnmountPanic tries to umount "dir" and panics on error.
func UnmountPanic(dir string) {
	err := UnmountErr(dir)
	if err != nil {
		fmt.Println(err)
		panic(err)
	}
}

// UnmountErr tries to unmount "dir" and returns the resulting error.
func UnmountErr(dir string) error {
	cmd := exec.Command(UnmountScript, "-u", "-z", dir)
	cmd.Stdout = os.Stdout
	cmd.Stderr = os.Stderr
	return cmd.Run()
}

// Md5fn returns an md5 string for file "filename"
func Md5fn(filename string) string {
	buf, err := ioutil.ReadFile(filename)
	if err != nil {
		fmt.Printf("ReadFile: %v\n", err)
		return ""
	}
	return Md5hex(buf)
}

// Md5hex returns an md5 string for "buf"
func Md5hex(buf []byte) string {
	rawHash := md5.Sum(buf)
	hash := hex.EncodeToString(rawHash[:])
	return hash
}

// VerifySize checks that the file size equals "want". This checks:
// 1) Size reported by Stat()
// 2) Number of bytes returned when reading the whole file
func VerifySize(t *testing.T, path string, want int) {
	buf, err := ioutil.ReadFile(path)
	if err != nil {
		t.Errorf("ReadFile failed: %v", err)
	} else if len(buf) != want {
		t.Errorf("wrong read size: got=%d want=%d", len(buf), want)
	}

	fi, err := os.Stat(path)
	if err != nil {
		t.Errorf("Stat failed: %v", err)
	} else if fi.Size() != int64(want) {
		t.Errorf("wrong stat file size, got=%d want=%d", fi.Size(), want)
	}
}

// TestMkdirRmdir creates and deletes a directory
func TestMkdirRmdir(t *testing.T, plainDir string) {
	dir := plainDir + "/dir1"
	err := os.Mkdir(dir, 0777)
	if err != nil {
		t.Error(err)
		return
	}
	err = syscall.Rmdir(dir)
	if err != nil {
		t.Error(err)
		return
	}
	// Removing a non-empty dir should fail with ENOTEMPTY
	if os.Mkdir(dir, 0777) != nil {
		t.Error(err)
		return
	}
	f, err := os.Create(dir + "/file")
	if err != nil {
		t.Error(err)
		return
	}
	f.Close()
	err = syscall.Rmdir(dir)
	errno := err.(syscall.Errno)
	if errno != syscall.ENOTEMPTY {
		t.Errorf("Should have gotten ENOTEMPTY, go %v", errno)
	}
	if syscall.Unlink(dir+"/file") != nil {
		t.Error(err)
		return
	}
	if syscall.Rmdir(dir) != nil {
		t.Error(err)
		return
	}
	// We should also be able to remove a directory we do not have permissions to
	// read or write
	err = os.Mkdir(dir, 0000)
	if err != nil {
		t.Error(err)
		return
	}
	err = syscall.Rmdir(dir)
	if err != nil {
		// Make sure the directory can cleaned up by the next test run
		os.Chmod(dir, 0700)
		t.Error(err)
		return
	}
}

// TestRename creates and renames a file
func TestRename(t *testing.T, plainDir string) {
	file1 := plainDir + "/rename1"
	file2 := plainDir + "/rename2"
	err := ioutil.WriteFile(file1, []byte("content"), 0777)
	if err != nil {
		t.Error(err)
		return
	}
	err = syscall.Rename(file1, file2)
	if err != nil {
		t.Error(err)
		return
	}
	syscall.Unlink(file2)
}

// VerifyExistence checks in 3 ways that "path" exists:
// stat, open, readdir
func VerifyExistence(path string) bool {
	// Check that file can be stated
	_, err := os.Stat(path)
	if err != nil {
		//t.Log(err)
		return false
	}
	// Check that file can be opened
	fd, err := os.Open(path)
	if err != nil {
		//t.Log(err)
		return false
	}
	fd.Close()
	// Check that file shows up in directory listing
	dir := filepath.Dir(path)
	name := filepath.Base(path)
	fi, err := ioutil.ReadDir(dir)
	if err != nil {
		//t.Log(err)
		return false
	}
	for _, i := range fi {
		if i.Name() == name {
			return true
		}
	}
	return false
}

// Du returns the disk usage of the file "fd" points to, in bytes.
// Same as "du --block-size=1".
func Du(t *testing.T, fd int) (nBytes int64) {
	var st syscall.Stat_t
	err := syscall.Fstat(fd, &st)
	if err != nil {
		t.Fatal(err)
	}
	// st.Blocks = number of 512-byte blocks
	return st.Blocks * 512
}

// QueryCtlSock sends a request to the control socket at "socketPath" and
// returns the response.
func QueryCtlSock(t *testing.T, socketPath string, req ctlsock.RequestStruct) (response ctlsock.ResponseStruct) {
	conn, err := net.DialTimeout("unix", socketPath, 1*time.Second)
	if err != nil {
		t.Fatal(err)
	}
	defer conn.Close()
	conn.SetDeadline(time.Now().Add(time.Second))
	msg, err := json.Marshal(req)
	if err != nil {
		t.Fatal(err)
	}
	_, err = conn.Write(msg)
	if err != nil {
		t.Fatal(err)
	}
	buf := make([]byte, ctlsock.ReadBufSize)
	n, err := conn.Read(buf)
	if err != nil {
		t.Fatal(err)
	}
	buf = buf[:n]
	json.Unmarshal(buf, &response)
	return response
}