410 lines
9.9 KiB
Go
410 lines
9.9 KiB
Go
package test_helpers
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import (
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"bytes"
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"crypto/md5"
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"encoding/hex"
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"fmt"
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"io/ioutil"
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"log"
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"os"
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"os/exec"
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"path/filepath"
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"syscall"
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"testing"
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"github.com/rfjakob/gocryptfs/ctlsock"
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"github.com/rfjakob/gocryptfs/internal/nametransform"
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"github.com/rfjakob/gocryptfs/internal/syscallcompat"
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)
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// TmpDir will be created inside this directory, set in init() to
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// $TMPDIR/gocryptfs-test-parent .
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var testParentDir = ""
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// GocryptfsBinary is the assumed path to the gocryptfs build.
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const GocryptfsBinary = "../../gocryptfs"
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// UnmountScript is the fusermount/umount compatibility wrapper script
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const UnmountScript = "../../tests/fuse-unmount.bash"
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// X255 contains 255 uppercase "X". This can be used as a maximum-length filename.
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var X255 string
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// TmpDir is a unique temporary directory. "go test" runs package tests in parallel. We create a
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// unique TmpDir in init() so the tests do not interfere.
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var TmpDir string
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// DefaultPlainDir is TmpDir + "/default-plain"
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var DefaultPlainDir string
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// DefaultCipherDir is TmpDir + "/default-cipher"
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var DefaultCipherDir string
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func init() {
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doInit()
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}
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func doInit() {
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X255 = string(bytes.Repeat([]byte("X"), 255))
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MountInfo = make(map[string]mountInfo)
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// Something like /tmp/gocryptfs-test-parent-1234
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testParentDir := fmt.Sprintf("%s/gocryptfs-test-parent-%d", os.TempDir(), os.Getuid())
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os.MkdirAll(testParentDir, 0755)
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if !isExt4(testParentDir) {
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fmt.Printf("test_helpers: warning: testParentDir %q does not reside on ext4, we will miss failures caused by ino reuse\n", testParentDir)
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}
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var err error
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TmpDir, err = ioutil.TempDir(testParentDir, "")
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if err != nil {
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panic(err)
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}
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// Open permissions for the allow_other tests
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os.Chmod(TmpDir, 0755)
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DefaultPlainDir = TmpDir + "/default-plain"
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DefaultCipherDir = TmpDir + "/default-cipher"
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}
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// ResetTmpDir deletes TmpDir, create new dir tree:
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//
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// TmpDir
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// |-- DefaultPlainDir
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// *-- DefaultCipherDir
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// *-- gocryptfs.diriv
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func ResetTmpDir(createDirIV bool) {
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// Try to unmount and delete everything
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entries, err := ioutil.ReadDir(TmpDir)
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if err == nil {
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for _, e := range entries {
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d := filepath.Join(TmpDir, e.Name())
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err = os.Remove(d)
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if err != nil {
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pe := err.(*os.PathError)
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if pe.Err == syscall.EBUSY {
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if testing.Verbose() {
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fmt.Printf("Remove failed: %v. Maybe still mounted?\n", pe)
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}
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err = UnmountErr(d)
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if err != nil {
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panic(err)
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}
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} else if pe.Err != syscall.ENOTEMPTY {
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panic("Unhandled error: " + pe.Err.Error())
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}
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err = os.RemoveAll(d)
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if err != nil {
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panic(err)
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}
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}
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}
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}
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err = os.Mkdir(DefaultPlainDir, 0755)
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if err != nil {
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panic(err)
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}
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err = os.Mkdir(DefaultCipherDir, 0755)
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if err != nil {
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panic(err)
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}
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if createDirIV {
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// Open cipherdir (following symlinks)
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dirfd, err := syscall.Open(DefaultCipherDir, syscall.O_DIRECTORY|syscallcompat.O_PATH, 0)
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if err == nil {
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err = nametransform.WriteDirIVAt(dirfd)
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syscall.Close(dirfd)
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}
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if err != nil {
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panic(err)
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}
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}
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}
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// isExt4 finds out if `path` resides on an ext4 filesystem, as reported by
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// statfs.
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func isExt4(path string) bool {
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// From man statfs
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const EXT4_SUPER_MAGIC = 0xef53
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var fs syscall.Statfs_t
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err := syscall.Statfs(path, &fs)
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if err != nil {
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return false
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}
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if fs.Type == EXT4_SUPER_MAGIC {
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return true
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}
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return false
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}
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// InitFS creates a new empty cipherdir and calls
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//
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// gocryptfs -q -init -extpass "echo test" -scryptn=10 $extraArgs $cipherdir
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//
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// It returns cipherdir without a trailing slash.
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//
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// If t is set, t.Fatal() is called on error, log.Panic() otherwise.
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func InitFS(t *testing.T, extraArgs ...string) string {
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prefix := "x."
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if t != nil {
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prefix = t.Name() + "."
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}
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dir, err := ioutil.TempDir(TmpDir, prefix)
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if err != nil {
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if t != nil {
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t.Fatal(err)
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} else {
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log.Panic(err)
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}
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}
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args := []string{"-q", "-init", "-extpass", "echo test", "-scryptn=10"}
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args = append(args, extraArgs...)
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args = append(args, dir)
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cmd := exec.Command(GocryptfsBinary, args...)
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cmd.Stdout = os.Stdout
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cmd.Stderr = os.Stderr
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err = cmd.Run()
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if err != nil {
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if t != nil {
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t.Fatalf("InitFS with args %q failed: %v", args, err)
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} else {
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log.Panic(err)
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}
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}
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return dir
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}
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// Md5fn returns an md5 string for file "filename"
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func Md5fn(filename string) string {
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buf, err := ioutil.ReadFile(filename)
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if err != nil {
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fmt.Printf("ReadFile: %v\n", err)
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return ""
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}
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return Md5hex(buf)
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}
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// Md5hex returns an md5 string for "buf"
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func Md5hex(buf []byte) string {
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rawHash := md5.Sum(buf)
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hash := hex.EncodeToString(rawHash[:])
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return hash
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}
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// VerifySize checks that the file size equals "want". This checks:
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// 1) Number of bytes returned when reading the whole file
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// 2) Size reported by Stat()
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// 3) Size reported by Fstat()
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func VerifySize(t *testing.T, path string, want int) {
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// Read whole file
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buf, err := ioutil.ReadFile(path)
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if err != nil {
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t.Errorf("ReadFile failed: %v", err)
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} else if len(buf) != want {
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t.Errorf("wrong read size: got=%d want=%d", len(buf), want)
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}
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// Stat()
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var st syscall.Stat_t
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err = syscall.Stat(path, &st)
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if err != nil {
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t.Errorf("Stat failed: %v", err)
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} else if st.Size != int64(want) {
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t.Errorf("wrong stat file size, got=%d want=%d", st.Size, want)
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}
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// Fstat()
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fd, err := os.Open(path)
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if err != nil {
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t.Fatal(err)
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}
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defer fd.Close()
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var st2 syscall.Stat_t
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err = syscall.Fstat(int(fd.Fd()), &st2)
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if err != nil {
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t.Fatal(err)
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}
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if st2.Size != int64(want) {
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t.Errorf("wrong fstat file size, got=%d want=%d", st2.Size, want)
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}
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// The inode number is not stable with `-sharedstorage`, ignore it in the
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// comparison.
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st.Ino = 0
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st2.Ino = 0
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if st != st2 {
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t.Logf("Stat vs Fstat mismatch:\nst= %#v\nst2=%#v", st, st2)
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}
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}
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// TestMkdirRmdir creates and deletes a directory
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func TestMkdirRmdir(t *testing.T, plainDir string) {
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dir := plainDir + "/dir1"
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err := os.Mkdir(dir, 0777)
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if err != nil {
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t.Error(err)
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return
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}
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err = syscall.Rmdir(dir)
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if err != nil {
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t.Error(err)
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return
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}
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// Create a directory and put a file in it
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// Trying to rmdir it should fail with ENOTEMPTY
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err = os.Mkdir(dir, 0777)
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if err != nil {
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t.Error(err)
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return
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}
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f, err := os.Create(dir + "/file")
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if err != nil {
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t.Error(err)
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return
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}
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f.Close()
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err = syscall.Rmdir(dir)
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errno := err.(syscall.Errno)
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if errno != syscall.ENOTEMPTY {
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t.Errorf("Should have gotten ENOTEMPTY, got %v", errno)
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}
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err = syscall.Unlink(dir + "/file")
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if err != nil {
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var st syscall.Stat_t
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syscall.Stat(dir, &st)
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t.Errorf("err=%v mode=%0o", err, st.Mode)
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return
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}
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err = syscall.Rmdir(dir)
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if err != nil {
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t.Error(err)
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return
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}
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// We should also be able to remove a directory we do not have permissions to
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// read or write
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err = os.Mkdir(dir, 0000)
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if err != nil {
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t.Error(err)
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return
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}
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err = syscall.Rmdir(dir)
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if err != nil {
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// Make sure the directory can cleaned up by the next test run
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os.Chmod(dir, 0700)
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t.Error(err)
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return
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}
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}
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// TestRename creates and renames a file
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func TestRename(t *testing.T, plainDir string) {
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file1 := plainDir + "/rename1"
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file2 := plainDir + "/rename2"
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err := ioutil.WriteFile(file1, []byte("content"), 0777)
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if err != nil {
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t.Error(err)
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return
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}
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err = syscall.Rename(file1, file2)
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if err != nil {
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t.Errorf("Rename: %v", err)
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return
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}
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syscall.Unlink(file2)
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}
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// VerifyExistence checks in 3 ways that "path" exists:
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// stat, open, readdir. Returns true if the path exists, false otherwise.
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// Panics if the result is inconsistent.
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func VerifyExistence(t *testing.T, path string) bool {
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t.Helper()
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// Check if file can be stat()ed
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stat := true
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fi, err := os.Stat(path)
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if err != nil {
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stat = false
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}
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// Check if file can be opened
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open := true
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fd, err := os.Open(path)
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if err != nil {
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open = false
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}
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fd.Close()
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// Check if file shows up in directory listing
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readdir := false
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dir := filepath.Dir(path)
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name := filepath.Base(path)
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d, err := os.Open(dir)
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if err != nil && open == true {
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t.Errorf("VerifyExistence: we can open the file but not the parent dir!? err=%v", err)
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} else if err == nil {
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defer d.Close()
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listing, err := d.Readdirnames(0)
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if stat && fi.IsDir() && err != nil {
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t.Errorf("VerifyExistence: It's a directory, but readdirnames failed: %v", err)
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}
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for _, entry := range listing {
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if entry == name {
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readdir = true
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}
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}
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}
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// If the result is consistent, return it.
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if stat == open && open == readdir {
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return stat
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}
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t.Errorf("VerifyExistence: inconsistent result on %q: stat=%v open=%v readdir=%v, path=%q", name, stat, open, readdir, path)
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return false
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}
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// Du returns the disk usage of the file "fd" points to, in bytes.
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// Same as "du --block-size=1".
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func Du(t *testing.T, fd int) (nBytes int64) {
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var st syscall.Stat_t
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err := syscall.Fstat(fd, &st)
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if err != nil {
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t.Fatal(err)
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}
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// st.Blocks = number of 512-byte blocks
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return st.Blocks * 512
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}
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// QueryCtlSock sends a request to the control socket at "socketPath" and
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// returns the response.
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func QueryCtlSock(t *testing.T, socketPath string, req ctlsock.RequestStruct) ctlsock.ResponseStruct {
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c, err := ctlsock.New(socketPath)
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if err != nil {
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// Connecting to the socket failed already. This is fatal.
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t.Fatal(err)
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}
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defer c.Close()
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resp, err := c.Query(&req)
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if err != nil {
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// If we got a response, try to extract it. This is not fatal here
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// as the tests may expect error responses.
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if resp2, ok := err.(*ctlsock.ResponseStruct); ok {
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return *resp2
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}
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// Another error means that we did not even get a response. This is fatal.
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t.Fatal(err)
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}
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return *resp
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}
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// ExtractCmdExitCode extracts the exit code from an error value that was
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// returned from exec / cmd.Run()
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func ExtractCmdExitCode(err error) int {
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if err == nil {
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return 0
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}
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// OMG this is convoluted
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if err2, ok := err.(*exec.ExitError); ok {
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return err2.Sys().(syscall.WaitStatus).ExitStatus()
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}
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if err2, ok := err.(*os.PathError); ok {
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return int(err2.Err.(syscall.Errno))
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}
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log.Panicf("could not decode error %#v", err)
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return 0
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}
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