Ignore .encfs6.xml file in reverse mode (#478)

* Ignore .encfs6.xml file in reverse mode
* Update reverse tests
* Add test cases

encfs/DirNode.cpp

@@ -52,8 +52,8 @@ class DirDeleter {
 };
 
 DirTraverse::DirTraverse(std::shared_ptr<DIR> _dirPtr, uint64_t _iv,
-                         std::shared_ptr<NameIO> _naming)
+                         std::shared_ptr<NameIO> _naming, bool _root)
-    : dir(std::move(_dirPtr)), iv(_iv), naming(std::move(_naming)) {}
+    : dir(std::move(_dirPtr)), iv(_iv), naming(std::move(_naming)), root(_root) {}
 
 DirTraverse &DirTraverse::operator=(const DirTraverse &src) = default;
 
@@ -61,6 +61,7 @@ DirTraverse::~DirTraverse() {
   dir.reset();
   iv = 0;
   naming.reset();
+  root = false;
 }
 
 static bool _nextName(struct dirent *&de, const std::shared_ptr<DIR> &dir,
@@ -90,6 +91,10 @@ static bool _nextName(struct dirent *&de, const std::shared_ptr<DIR> &dir,
 std::string DirTraverse::nextPlaintextName(int *fileType, ino_t *inode) {
   struct dirent *de = nullptr;
   while (_nextName(de, dir, fileType, inode)) {
+    if (root && (strcmp(".encfs6.xml", de->d_name) == 0)) {
+      VLOG(1) << "skipping filename: " << de->d_name;
+      continue;
+    }
     try {
       uint64_t localIv = iv;
       return naming->decodePath(de->d_name, &localIv);
@@ -106,6 +111,10 @@ std::string DirTraverse::nextInvalid() {
   struct dirent *de = nullptr;
   // find the first name which produces a decoding error...
   while (_nextName(de, dir, (int *)nullptr, (ino_t *)nullptr)) {
+    if (root && (strcmp(".encfs6.xml", de->d_name) == 0)) {
+      VLOG(1) << "skipping filename: " << de->d_name;
+      continue;
+    }
     try {
       uint64_t localIv = iv;
       naming->decodePath(de->d_name, &localIv);
@@ -355,7 +364,7 @@ DirTraverse DirNode::openDir(const char *plaintextPath) {
   if (dir == nullptr) {
     int eno = errno;
     VLOG(1) << "opendir error " << strerror(eno);
-    return DirTraverse(shared_ptr<DIR>(), 0, std::shared_ptr<NameIO>());
+    return DirTraverse(shared_ptr<DIR>(), 0, std::shared_ptr<NameIO>(), false);
   }
   std::shared_ptr<DIR> dp(dir, DirDeleter());
 
@@ -369,7 +378,7 @@ DirTraverse DirNode::openDir(const char *plaintextPath) {
   } catch (encfs::Error &err) {
     RLOG(ERROR) << "encode err: " << err.what();
   }
-  return DirTraverse(dp, iv, naming);
+  return DirTraverse(dp, iv, naming, (strlen(plaintextPath) == 1));
 }
 
 bool DirNode::genRenameList(list<RenameEl> &renameList, const char *fromP,

encfs/DirNode.h

@@ -49,7 +49,7 @@ struct RenameEl;
 class DirTraverse {
  public:
   DirTraverse(std::shared_ptr<DIR> dirPtr, uint64_t iv,
-              std::shared_ptr<NameIO> naming);
+              std::shared_ptr<NameIO> naming, bool root);
   ~DirTraverse();
 
   DirTraverse &operator=(const DirTraverse &src);
@@ -74,6 +74,7 @@ class DirTraverse {
   // more efficient to support filename IV chaining..
   uint64_t iv;
   std::shared_ptr<NameIO> naming;
+  bool root;
 };
 inline bool DirTraverse::valid() const { return dir.get() != 0; }
 

integration/normal.t.pl

@@ -2,7 +2,7 @@
 
 # Test EncFS normal and paranoid mode
 
-use Test::More tests => 132;
+use Test::More tests => 136;
 use File::Path;
 use File::Copy;
 use File::Temp;
@@ -235,6 +235,11 @@ sub truncate
 # Test file creation and removal
 sub fileCreation
 {
+    # first be sure .encfs6.xml does not show up
+    my $f = encName(".encfs6.xml");
+    cmp_ok( length($f), '>', 8, "encrypted name ok" );
+    ok( ! -f "$raw/$f", "configuration file .encfs6.xml not visible in $raw" );
+
     # create a file
     qx(date > "$crypt/df.txt");
     ok( -f "$crypt/df.txt", "file created" ) || BAIL_OUT("file create failed");

integration/reverse.t.pl

@@ -91,11 +91,11 @@ sub encName
 	return $enc;
 }
 
-# Copy a directory tree and verify that the decrypted data is identical
+# Copy a directory tree and verify that the decrypted data is identical, we also create a foo/.encfs6.xml file, to be sure it correctly shows-up
 sub copy_test
 {
-    ok(system("cp -a encfs $plain")==0, "copying files to plain");
+    ok(system("cp -a encfs $plain && mkdir $plain/foo && touch $plain/foo/.encfs6.xml")==0, "copying files to plain");
-    ok(system("diff -r -q $plain $decrypted")==0, "decrypted files are identical");
+    ok(system("diff -r -q --exclude='.encfs6.xml' $plain $decrypted")==0, "decrypted files are identical");
     ok(-f "$plain/encfs/encfs.cpp", "file exists");
     unlink("$plain/encfs/encfs.cpp");
     ok(! -f "$decrypted/encfs.cpp", "file deleted");