aboutsummaryrefslogtreecommitdiff
path: root/tests/test_helpers/helpers.go
blob: 7275997117ae8bd020aea9aec734f6a99917cb1d (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
package test_helpers

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

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

// TmpDir will be created inside this directory, set in init() to
// $TMPDIR/gocryptfs-test-parent .
var testParentDir = ""

// 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

// SwitchTMPDIR changes TMPDIR and hence the directory the test are performed in.
// This is used when you want to perform tests on a special filesystem. The
// xattr tests cannot run on tmpfs and use /var/tmp instead of /tmp.
func SwitchTMPDIR(newDir string) {
	os.Setenv("TMPDIR", newDir)
	doInit()
}

func init() {
	doInit()
}

func doInit() {
	X255 = string(bytes.Repeat([]byte("X"), 255))
	MountInfo = make(map[string]mountInfo)
	// Something like /tmp/gocryptfs-test-parent-1234
	testParentDir := fmt.Sprintf("%s/gocryptfs-test-parent-%d", os.TempDir(), os.Getuid())
	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 {
		// Open cipherdir (following symlinks)
		dirfd, err := syscall.Open(DefaultCipherDir, syscall.O_DIRECTORY|syscallcompat.O_PATH, 0)
		if err == nil {
			err = nametransform.WriteDirIVAt(dirfd)
			syscall.Close(dirfd)
		}
		if err != nil {
			panic(err)
		}
	}
}

// InitFS creates a new empty cipherdir and calls
//
//     gocryptfs -q -init -extpass "echo test" -scryptn=10 $extraArgs $cipherdir
//
// It returns cipherdir without a 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 %q failed: %v", args, err)
		} else {
			log.Panic(err)
		}
	}

	return dir
}

// 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
	}
	// Create a directory and put a file in it
	// Trying to rmdir it should fail with ENOTEMPTY
	err = os.Mkdir(dir, 0777)
	if err != 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, got %v", errno)
	}
	err = syscall.Unlink(dir + "/file")
	if err != nil {
		var st syscall.Stat_t
		syscall.Stat(dir, &st)
		t.Errorf("err=%v mode=%0o", err, st.Mode)
		return
	}
	err = syscall.Rmdir(dir)
	if err != 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. Returns true if the path exists, false otherwise.
// Panics if the result is inconsistent.
func VerifyExistence(path string) bool {
	// Check if file can be stat()ed
	stat := true
	fi, err := os.Stat(path)
	if err != nil {
		stat = false
	}
	// Check if file can be opened
	open := true
	fd, err := os.Open(path)
	if err != nil {
		open = false
	}
	fd.Close()
	// Check if file shows up in directory listing
	readdir := false
	dir := filepath.Dir(path)
	name := filepath.Base(path)
	d, err := os.Open(dir)
	if err != nil && open == true {
		log.Panicf("we can open the file but not the parent dir!? err=%v", err)
	} else if err == nil {
		defer d.Close()
		listing, err := d.Readdirnames(0)
		if stat && fi.IsDir() && err != nil {
			log.Panicf("It's a directory, but readdirnames failed: %v", err)
		}
		for _, entry := range listing {
			if entry == name {
				readdir = true
			}
		}
	}
	// If the result is consistent, return it.
	if stat == open && open == readdir {
		return stat
	}
	log.Panicf("inconsistent result on %q: stat=%v open=%v readdir=%v, path=%q", name, stat, open, readdir, path)
	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
}

// ExtractCmdExitCode extracts the exit code from an error value that was
// returned from exec / cmd.Run()
func ExtractCmdExitCode(err error) int {
	if err == nil {
		return 0
	}
	// OMG this is convoluted
	if err2, ok := err.(*exec.ExitError); ok {
		return err2.Sys().(syscall.WaitStatus).ExitStatus()
	}
	if err2, ok := err.(*os.PathError); ok {
		return int(err2.Err.(syscall.Errno))
	}
	log.Panicf("could not decode error %#v", err)
	return 0
}