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package reverse_test
import (
"bytes"
"fmt"
"io/ioutil"
"os"
"runtime"
"syscall"
"testing"
"golang.org/x/sys/unix"
"github.com/rfjakob/gocryptfs/internal/ctlsock"
"github.com/rfjakob/gocryptfs/internal/syscallcompat"
"github.com/rfjakob/gocryptfs/tests/test_helpers"
)
// TestLongnameStat checks that file names of all sizes (1 to 255) show up in
// the decrypted reverse view (dirC, mounted in TestMain).
func TestLongnameStat(t *testing.T) {
for i := 1; i <= 255; i++ {
name := string(bytes.Repeat([]byte("x"), i))
fd, err := os.Create(dirA + "/" + name)
if err != nil {
t.Fatal(err)
}
fd.Close()
path := dirC + "/" + name
if !test_helpers.VerifyExistence(path) {
t.Fatalf("failed to verify %q", path)
}
test_helpers.VerifySize(t, path, 0)
// A large number of longname files is a performance problem in
// reverse mode. Move the file out of the way once we are done with it
// to speed up the test (2 seconds -> 0.2 seconds).
// We do NOT unlink it because ext4 reuses inode numbers immediately,
// which will cause "Found linked inode, but Nlink == 1" warnings and
// file not found errors.
// TODO: This problem should be handled at the go-fuse level.
syscall.Rename(dirA+"/"+name, test_helpers.TmpDir+"/"+fmt.Sprintf("x%d", i))
}
}
func TestSymlinks(t *testing.T) {
target := "/"
os.Symlink(target, dirA+"/symlink")
cSymlink := dirC + "/symlink"
_, err := os.Lstat(cSymlink)
if err != nil {
t.Errorf("Lstat: %v", err)
}
_, err = os.Stat(cSymlink)
if err != nil {
t.Errorf("Stat: %v", err)
}
actualTarget, err := os.Readlink(cSymlink)
if err != nil {
t.Fatal(err)
}
if target != actualTarget {
t.Errorf("wrong symlink target: want=%q have=%q", target, actualTarget)
}
}
// Symbolic link dentry sizes should be set to the length of the string
// that contains the target path.
func TestSymlinkDentrySize(t *testing.T) {
if plaintextnames {
t.Skip("this only tests encrypted names")
}
symlink := "a_symlink"
mnt, err := ioutil.TempDir(test_helpers.TmpDir, "reverse_mnt_")
if err != nil {
t.Fatal(err)
}
sock := mnt + ".sock"
test_helpers.MountOrFatal(t, "ctlsock_reverse_test_fs", mnt, "-reverse", "-extpass", "echo test", "-ctlsock="+sock)
defer test_helpers.UnmountPanic(mnt)
req := ctlsock.RequestStruct{EncryptPath: symlink}
symlinkResponse := test_helpers.QueryCtlSock(t, sock, req)
if symlinkResponse.ErrNo != 0 {
t.Errorf("Encrypt: %q ErrNo=%d ErrText=%s", symlink, symlinkResponse.ErrNo, symlinkResponse.ErrText)
}
fi, err := os.Lstat(mnt + "/" + symlinkResponse.Result)
if err != nil {
t.Errorf("Lstat: %v", err)
}
target, err := os.Readlink(mnt + "/" + symlinkResponse.Result)
if err != nil {
t.Errorf("Readlink: %v", err)
}
if fi.Size() != int64(len(target)) {
t.Errorf("Lstat reports that symbolic link %q's dentry size is %d, but this does not "+
"match the length of the string returned by readlink, which is %d.",
symlink, fi.Size(), len(target))
}
}
// .gocryptfs.reverse.conf in the plaintext dir should be visible as
// gocryptfs.conf
func TestConfigMapping(t *testing.T) {
c := dirB + "/gocryptfs.conf"
if !test_helpers.VerifyExistence(c) {
t.Errorf("%s missing", c)
}
data, err := ioutil.ReadFile(c)
if err != nil {
t.Fatal(err)
}
if len(data) == 0 {
t.Errorf("empty file")
}
}
// Check that the access() syscall works on virtual files
func TestAccessVirtual(t *testing.T) {
if plaintextnames {
t.Skip("test makes no sense for plaintextnames")
}
var R_OK uint32 = 4
var W_OK uint32 = 2
var X_OK uint32 = 1
fn := dirB + "/gocryptfs.diriv"
err := syscall.Access(fn, R_OK)
if err != nil {
t.Errorf("%q should be readable, but got error: %v", fn, err)
}
err = syscall.Access(fn, W_OK)
if err == nil {
t.Errorf("should NOT be writeable")
}
err = syscall.Access(fn, X_OK)
if err == nil {
t.Errorf("should NOT be executable")
}
}
// Check that the access() syscall works on regular files
func TestAccess(t *testing.T) {
f, err := os.Create(dirA + "/testaccess1")
if err != nil {
t.Fatal(err)
}
f.Close()
f, err = os.Open(dirB)
if err != nil {
t.Fatal(err)
}
names, err := f.Readdirnames(0)
if err != nil {
t.Fatal(err)
}
for _, n := range names {
// Check if file exists - this should never fail
err = syscallcompat.Faccessat(unix.AT_FDCWD, dirB+"/"+n, unix.F_OK)
if err != nil {
t.Errorf("%s: %v", n, err)
}
// Check if file is readable
err = syscallcompat.Faccessat(unix.AT_FDCWD, dirB+"/"+n, unix.R_OK)
if err != nil {
t.Logf("%s: %v", n, err)
}
}
}
// Opening a nonexistant file name should return ENOENT
// and not EBADMSG or EIO or anything else.
func TestEnoent(t *testing.T) {
fn := dirB + "/TestEnoent"
_, err := syscall.Open(fn, syscall.O_RDONLY, 0)
if err != syscall.ENOENT {
t.Errorf("want ENOENT, got: %v", err)
}
}
// If the symlink target gets too long due to base64 encoding, we should
// return ENAMETOOLONG instead of having the kernel reject the data and
// returning an I/O error to the user.
// https://github.com/rfjakob/gocryptfs/issues/167
func TestTooLongSymlink(t *testing.T) {
l := 4000
if runtime.GOOS == "darwin" {
l = 1000 // max length is much lower on darwin
}
fn := dirA + "/TooLongSymlink"
target := string(bytes.Repeat([]byte("x"), l))
err := os.Symlink(target, fn)
if err != nil {
t.Fatal(err)
}
_, err = os.Readlink(dirC + "/TooLongSymlink")
if err == nil {
return
}
err2 := err.(*os.PathError)
if err2.Err != syscall.ENAMETOOLONG {
t.Errorf("Expected %q error, got %q instead", syscall.ENAMETOOLONG,
err2.Err)
}
}
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