3 files changed, 490 insertions, 0 deletions
diff --git a/integration_tests/helpers.go b/integration_tests/helpers.go
new file mode 100644
index 0000000..9bfd9fc
--- /dev/null
+++ b/integration_tests/helpers.go
@@ -0,0 +1,94 @@
+package integration_tests
+
+import (
+	"os"
+	"os/exec"
+	"fmt"
+	"io/ioutil"
+	"crypto/md5"
+	"encoding/hex"
+	"testing"
+)
+
+const tmpDir = "/tmp/gocryptfs_main_test/"
+// Mountpoint
+const plainDir = tmpDir + "plain/"
+const cipherDir = tmpDir + "cipher/"
+
+func resetTmpDir() {
+	fu := exec.Command("fusermount", "-z", "-u", plainDir)
+	fu.Run()
+
+	os.RemoveAll(tmpDir)
+
+	err := os.MkdirAll(plainDir, 0777)
+	if err != nil {
+		panic("Could not create plainDir")
+	}
+
+	err = os.MkdirAll(cipherDir, 0777)
+	if err != nil {
+		panic("Could not create cipherDir")
+	}
+}
+
+func mount(extraArgs ...string) {
+	var args []string
+	args = append(args, extraArgs...)
+	//args = append(args, "--fusedebug")
+	args = append(args, cipherDir)
+	args = append(args, plainDir)
+	c := exec.Command("../gocryptfs", args...)
+	// Warning messages clutter the test output. Uncomment if you want to debug
+	// failures.
+	//c.Stdout = os.Stdout
+	//c.Stderr = os.Stderr
+	err := c.Run()
+	if err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
+}
+
+func unmount() error {
+	fu := exec.Command("fusermount", "-z", "-u", plainDir)
+	fu.Stdout = os.Stdout
+	fu.Stderr = os.Stderr
+	return fu.Run()
+}
+
+// Return 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)
+}
+
+// Return md5 string for "buf"
+func md5hex(buf []byte) string {
+	rawHash := md5.Sum(buf)
+	hash := hex.EncodeToString(rawHash[:])
+	return hash
+}
+
+// Verify 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)
+	}
+}
diff --git a/integration_tests/main_test.go b/integration_tests/main_test.go
new file mode 100644
index 0000000..222c192
--- /dev/null
+++ b/integration_tests/main_test.go
@@ -0,0 +1,308 @@
+package integration_tests
+
+import (
+	"flag"
+	"bytes"
+	"crypto/md5"
+	"encoding/hex"
+	"fmt"
+	"io/ioutil"
+	"os"
+	"runtime"
+	"sync"
+	"testing"
+)
+
+var plaintextNames bool
+
+// This is the entry point for the tests
+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.Printf("***** Testing with OpenSSL\n")
+	}
+	resetTmpDir()
+	mount("--zerokey")
+	r := m.Run()
+	unmount()
+
+	if defaultonly {
+		os.Exit(r)
+	}
+
+
+	if testing.Verbose() {
+		fmt.Printf("***** Testing with native Go crypto\n")
+	}
+	resetTmpDir()
+	mount("--zerokey", "--openssl=false")
+	r = m.Run()
+	unmount()
+
+	if testing.Verbose() {
+		fmt.Printf("***** Testing \"--plaintextnames\"\n")
+	}
+	resetTmpDir()
+	mount("--zerokey", "--plaintextnames")
+	plaintextNames = true
+	r = m.Run()
+	unmount()
+
+	os.Exit(r)
+}
+
+// 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(plainDir + fn)
+	if err != nil {
+		t.FailNow()
+	}
+
+	d := make([]byte, n)
+	written, err := file.Write(d)
+	if err != nil || written != len(d) {
+		fmt.Printf("err=\"%s\", written=%d\n", err, written)
+		t.Fail()
+	}
+	file.Close()
+
+	verifySize(t, plainDir+fn, n)
+
+	bin := md5.Sum(d)
+	hashWant := hex.EncodeToString(bin[:])
+
+	hashActual := md5fn(plainDir + fn)
+
+	if hashActual != hashWant {
+		t.Errorf("Wrong content, hashWant=%s hashActual=%s\n", 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(plainDir + "1M")
+		if hashActual != hashWant {
+			fmt.Printf("Read corruption in loop # %d\n", i)
+			t.FailNow()
+		} else {
+			//fmt.Print(".")
+		}
+	}
+}
+
+func TestTruncate(t *testing.T) {
+	fn := plainDir + "truncate"
+	file, err := os.Create(fn)
+	if err != nil {
+		t.FailNow()
+	}
+	// Grow to two blocks
+	file.Truncate(7000)
+	verifySize(t, fn, 7000)
+	if md5fn(fn) != "95d4ec7038e3e4fdbd5f15c34c3f0b34" {
+		t.Errorf("wrong content")
+	}
+	// Shrink - needs RMW
+	file.Truncate(6999)
+	verifySize(t, fn, 6999)
+	if md5fn(fn) != "35fd15873ec6c35380064a41b9b9683b" {
+		t.Errorf("wrong content")
+	}
+	// Shrink to one partial block
+	file.Truncate(465)
+	verifySize(t, fn, 465)
+	if md5fn(fn) != "a1534d6e98a6b21386456a8f66c55260" {
+		t.Errorf("wrong content")
+	}
+	// Grow to exactly one block
+	file.Truncate(4096)
+	verifySize(t, fn, 4096)
+	if md5fn(fn) != "620f0b67a91f7f74151bc5be745b7110" {
+		t.Errorf("wrong content")
+	}
+}
+
+func TestAppend(t *testing.T) {
+	fn := plainDir + "append"
+	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 := plainDir + "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)
+	}
+}
+
+func sContains(haystack []string, needle string) bool {
+	for _, element := range haystack {
+		if element == needle {
+			return true
+		}
+	}
+	return false
+}
+
+func TestRmwRace(t *testing.T) {
+
+	runtime.GOMAXPROCS(10)
+
+	fn := plainDir + "rmwrace"
+	f1, err := os.Create(fn)
+	if err != nil {
+		t.Fatalf("file create failed")
+	}
+	f2, err := os.Create(fn)
+	if err != nil {
+		t.Fatalf("file create failed")
+	}
+
+	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")
+		}
+
+		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()
+			}
+		*/
+	}
+	if testing.Verbose() {
+		fmt.Println(goodMd5)
+	}
+}
+
+// With "--plaintextnames", the name "/gocryptfs.conf" is reserved.
+// Otherwise there should be no restrictions.
+func TestFiltered(t *testing.T) {
+	filteredFile := plainDir + "gocryptfs.conf"
+	file, err := os.Create(filteredFile)
+	if plaintextNames == true && err == nil {
+		fmt.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 {
+		fmt.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(plainDir + "TestFilenameEncryption.txt")
+	file.Close()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	_, err = os.Stat(cipherDir + "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")
+	}
+}
diff --git a/integration_tests/performance_test.go b/integration_tests/performance_test.go
new file mode 100644
index 0000000..e4a618a
--- /dev/null
+++ b/integration_tests/performance_test.go
@@ -0,0 +1,88 @@
+package integration_tests
+
+import (
+	"os"
+	"os/exec"
+	"fmt"
+	"io"
+	"testing"
+)
+
+func BenchmarkStreamWrite(t *testing.B) {
+	buf := make([]byte, 1024*1024)
+	t.SetBytes(int64(len(buf)))
+
+	file, err := os.Create(plainDir + "BenchmarkWrite")
+	if err != nil {
+		t.FailNow()
+	}
+
+	t.ResetTimer()
+	var i int
+	for i = 0; i < t.N; i++ {
+		written, err := file.Write(buf)
+		if err != nil {
+			fmt.Printf("err=\"%s\", written=%d\n", err.Error(), written)
+			t.FailNow()
+		}
+	}
+	file.Close()
+}
+
+func BenchmarkStreamRead(t *testing.B) {
+	buf := make([]byte, 1024*1024)
+	t.SetBytes(int64(len(buf)))
+
+	fn := plainDir + "BenchmarkWrite"
+	fi, _ := os.Stat(fn)
+	mb := int(fi.Size() / 1024 / 1024)
+
+	if t.N > mb {
+		// Grow file so we can satisfy the test
+		//fmt.Printf("Growing file to %d MB... ", t.N)
+		f2, err := os.OpenFile(fn, os.O_WRONLY|os.O_APPEND, 0666)
+		if err != nil {
+			fmt.Println(err)
+			t.FailNow()
+		}
+		for h := 0; h < t.N-mb; h++ {
+			_, err = f2.Write(buf)
+			if err != nil {
+				fmt.Println(err)
+				t.FailNow()
+			}
+		}
+		f2.Close()
+		//fmt.Printf("done\n")
+	}
+
+	file, err := os.Open(plainDir + "BenchmarkWrite")
+	if err != nil {
+		t.FailNow()
+	}
+	t.ResetTimer()
+	var i int
+	for i = 0; i < t.N; i++ {
+		_, err := file.Read(buf)
+		if err == io.EOF {
+			fmt.Printf("Test file too small\n")
+			t.SkipNow()
+		} else if err != nil {
+			fmt.Println(err)
+			t.FailNow()
+		}
+	}
+	file.Close()
+}
+
+func BenchmarkUntar(t *testing.B) {
+	t.SetBytes(422229778)
+	c := exec.Command("tar", "xf", "/tmp/linux-3.0.tar.gz", "-C", plainDir)
+	c.Stdout = os.Stdout
+	c.Stderr = os.Stderr
+	t.ResetTimer()
+	err := c.Run()
+	if err != nil {
+		t.Fatal(err)
+	}
+}