libgocryptfs/integration_tests/main_test.go

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package integration_tests
// File reading, writing, modification, truncate
import (
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"bytes"
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"crypto/md5"
"encoding/hex"
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"flag"
"fmt"
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"io/ioutil"
"os"
"runtime"
"sync"
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"testing"
)
var plaintextNames bool
// This is the entry point for the tests
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func TestMain(m *testing.M) {
var defaultonly bool
flag.BoolVar(&defaultonly, "defaultonly", false, "Only test default configuration (openssl=true, plaintextnames=false)")
flag.Parse()
if testing.Verbose() {
fmt.Println("***** Testing with OpenSSL")
}
resetTmpDir() // <- this also create gocryptfs.diriv
mount(defaultCipherDir, defaultPlainDir, "--zerokey")
r := m.Run()
unmount(defaultPlainDir)
if r != 0 {
os.Exit(r)
}
if defaultonly {
os.Exit(r)
}
if testing.Verbose() {
fmt.Println("***** Testing with native Go crypto")
}
resetTmpDir()
mount(defaultCipherDir, defaultPlainDir, "--zerokey", "--openssl=false")
r = m.Run()
unmount(defaultPlainDir)
if r != 0 {
os.Exit(r)
}
if testing.Verbose() {
fmt.Println("***** Testing \"--plaintextnames\"")
}
resetTmpDir()
mount(defaultCipherDir, defaultPlainDir, "--zerokey", "--plaintextnames")
plaintextNames = true
r = m.Run()
unmount(defaultPlainDir)
if r != 0 {
os.Exit(r)
}
os.Exit(r)
}
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// Write "n" zero bytes to filename "fn", read again, compare hash
func testWriteN(t *testing.T, fn string, n int) string {
file, err := os.Create(defaultPlainDir + fn)
if err != nil {
t.Fatal(err)
}
d := make([]byte, n)
written, err := file.Write(d)
if err != nil || written != len(d) {
t.Errorf("err=\"%s\", written=%d", err, written)
}
err = file.Close()
if err != nil {
t.Error(err)
}
verifySize(t, defaultPlainDir+fn, n)
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bin := md5.Sum(d)
hashWant := hex.EncodeToString(bin[:])
hashActual := md5fn(defaultPlainDir + fn)
if hashActual != hashWant {
t.Errorf("Wrong content, hashWant=%s hashActual=%s", hashWant, hashActual)
}
return hashActual
}
func TestWrite10(t *testing.T) {
testWriteN(t, "10", 10)
}
func TestWrite100(t *testing.T) {
testWriteN(t, "100", 100)
}
func TestWrite1M(t *testing.T) {
testWriteN(t, "1M", 1024*1024)
}
func TestWrite1Mx100(t *testing.T) {
hashWant := testWriteN(t, "1Mx100", 1024*1024)
// Read and check 100 times to catch race conditions
var i int
for i = 0; i < 100; i++ {
hashActual := md5fn(defaultPlainDir + "1M")
if hashActual != hashWant {
fmt.Printf("Read corruption in loop # %d\n", i)
t.FailNow()
} else {
//fmt.Print(".")
}
}
}
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func TestTruncate(t *testing.T) {
fn := defaultPlainDir + "truncate"
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file, err := os.Create(fn)
if err != nil {
t.FailNow()
}
// Grow to two blocks
file.Truncate(7000)
verifySize(t, fn, 7000)
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if md5fn(fn) != "95d4ec7038e3e4fdbd5f15c34c3f0b34" {
t.Errorf("wrong content")
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}
// Shrink - needs RMW
file.Truncate(6999)
verifySize(t, fn, 6999)
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if md5fn(fn) != "35fd15873ec6c35380064a41b9b9683b" {
t.Errorf("wrong content")
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}
// Shrink to one partial block
file.Truncate(465)
verifySize(t, fn, 465)
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if md5fn(fn) != "a1534d6e98a6b21386456a8f66c55260" {
t.Errorf("wrong content")
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}
// Grow to exactly one block
file.Truncate(4096)
verifySize(t, fn, 4096)
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if md5fn(fn) != "620f0b67a91f7f74151bc5be745b7110" {
t.Errorf("wrong content")
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}
}
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func TestAppend(t *testing.T) {
fn := defaultPlainDir + "append"
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file, err := os.Create(fn)
if err != nil {
t.FailNow()
}
data := []byte("testdata123456789") // length 17
var buf bytes.Buffer
var hashWant string
for i := 0; i <= 500; i++ {
file.Write(data)
buf.Write(data)
bin := md5.Sum(buf.Bytes())
hashWant = hex.EncodeToString(bin[:])
hashActual := md5fn(fn)
if hashWant != hashActual {
t.FailNow()
}
}
// Overwrite with the same data
// Hash must stay the same
file.Seek(0, 0)
for i := 0; i <= 500; i++ {
file.Write(data)
hashActual := md5fn(fn)
if hashWant != hashActual {
t.FailNow()
}
}
}
// Create a file with holes by writing to offset 0 (block #0) and
// offset 4096 (block #1).
func TestFileHoles(t *testing.T) {
fn := defaultPlainDir + "fileholes"
file, err := os.Create(fn)
if err != nil {
t.Errorf("file create failed")
}
foo := []byte("foo")
file.Write(foo)
file.WriteAt(foo, 4096)
_, err = ioutil.ReadFile(fn)
if err != nil {
t.Error(err)
}
}
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// sContains - does the slice of strings "haystack" contain "needle"?
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func sContains(haystack []string, needle string) bool {
for _, element := range haystack {
if element == needle {
return true
}
}
return false
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}
func TestRmwRace(t *testing.T) {
runtime.GOMAXPROCS(10)
fn := defaultPlainDir + "rmwrace"
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f1, err := os.Create(fn)
if err != nil {
t.Fatalf("file create failed")
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}
f2, err := os.Create(fn)
if err != nil {
t.Fatalf("file create failed")
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}
oldBlock := bytes.Repeat([]byte("o"), 4096)
newBlock := bytes.Repeat([]byte("n"), 4096)
shortBlock := bytes.Repeat([]byte("s"), 16)
mergedBlock := make([]byte, 4096)
copy(mergedBlock, newBlock)
copy(mergedBlock[4080:], shortBlock)
goodMd5 := make(map[string]int)
for i := 0; i < 1000; i++ {
// Reset to [ooooooooo]
_, err = f1.WriteAt(oldBlock, 0)
if err != nil {
t.Fatalf("Write failed")
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}
var wg sync.WaitGroup
wg.Add(2)
// Write to the end of the file, [....ssss]
go func() {
f1.WriteAt(shortBlock, 4080)
wg.Done()
}()
// Overwrite to [nnnnnnn]
go func() {
f2.WriteAt(newBlock, 0)
wg.Done()
}()
wg.Wait()
// The file should be either:
// [nnnnnnnnnn] (md5: 6c1660fdabccd448d1359f27b3db3c99) or
// [nnnnnnssss] (md5: da885006a6a284530a427c73ce1e5c32)
// but it must not be
// [oooooossss]
buf, _ := ioutil.ReadFile(fn)
m := md5hex(buf)
goodMd5[m] = goodMd5[m] + 1
/*
if m == "6c1660fdabccd448d1359f27b3db3c99" {
fmt.Println(hex.Dump(buf))
t.FailNow()
}
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*/
}
if testing.Verbose() {
fmt.Println(goodMd5)
}
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}
// With "--plaintextnames", the name "/gocryptfs.conf" is reserved.
// Otherwise there should be no restrictions.
func TestFiltered(t *testing.T) {
filteredFile := defaultPlainDir + "gocryptfs.conf"
file, err := os.Create(filteredFile)
if plaintextNames == true && err == nil {
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t.Errorf("should have failed but didn't")
} else if plaintextNames == false && err != nil {
t.Error(err)
}
file.Close()
err = os.Remove(filteredFile)
if plaintextNames == true && err == nil {
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t.Errorf("should have failed but didn't")
} else if plaintextNames == false && err != nil {
t.Error(err)
}
}
func TestFilenameEncryption(t *testing.T) {
file, err := os.Create(defaultPlainDir + "TestFilenameEncryption.txt")
file.Close()
if err != nil {
t.Fatal(err)
}
_, err = os.Stat(defaultCipherDir + "TestFilenameEncryption.txt")
if plaintextNames == true && err != nil {
t.Errorf("plaintextnames not working: %v", err)
} else if plaintextNames == false && err == nil {
t.Errorf("file name encryption not working")
}
}
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// Test Mkdir and Rmdir
func TestMkdirRmdir(t *testing.T) {
testMkdirRmdir(t, defaultPlainDir)
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}
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// Test Rename
func TestRename(t *testing.T) {
testRename(t, defaultPlainDir)
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}
// Overwrite an empty directory with another directory
func TestDirOverwrite(t *testing.T) {
dir1 := defaultPlainDir + "DirOverwrite1"
dir2 := defaultPlainDir + "DirOverwrite2"
err := os.Mkdir(dir1, 0777)
if err != nil {
t.Fatal(err)
}
err = os.Mkdir(dir2, 0777)
if err != nil {
t.Fatal(err)
}
err = os.Rename(dir1, dir2)
if err != nil {
t.Fatal(err)
}
}