Corrects encfsctl cat and add reverse cat (#483)

Correct encfsctl cat and add --reverse

encfs/encfsctl.cpp

@@ -34,6 +34,7 @@
 
 #include "Cipher.h"
 #include "CipherKey.h"
+#include "Context.h"
 #include "DirNode.h"
 #include "Error.h"
 #include "FSConfig.h"
@@ -95,7 +96,7 @@ struct CommandOpts {
     {"showcruft", 1, 1, cmd_showcruft, "(root dir)",
      // xgroup(usage)
      gettext_noop("  -- show undecodable filenames in the volume")},
-    {"cat", 2, 3, cmd_cat, "[--extpass=prog] (root dir) path",
+    {"cat", 2, 4, cmd_cat, "[--extpass=prog] [--reverse] (root dir) path",
      // xgroup(usage)
      gettext_noop("  -- decodes the file and cats it to standard out")},
     {"decode", 1, 100, cmd_decode,
@@ -219,7 +220,7 @@ static RootPtr initRootInfo(int &argc, char **&argv) {
   opts->createIfNotFound = false;
   opts->checkKey = false;
 
-  static struct option long_options[] = {{"extpass", 1, 0, 'p'}, {0, 0, 0, 0}};
+  static struct option long_options[] = {{"extpass", 1, 0, 'p'}, {"reverse", 0, nullptr, 'r'}, {0, 0, 0, 0}};
 
   for (;;) {
     int option_index = 0;
@@ -231,6 +232,9 @@ static RootPtr initRootInfo(int &argc, char **&argv) {
       case 'p':
         opts->passwordProgram.assign(optarg);
         break;
+      case 'r':
+        opts->reverseEncryption = true;
+        break;
       default:
         RLOG(WARNING) << "getopt error: " << res;
         break;
@@ -248,7 +252,9 @@ static RootPtr initRootInfo(int &argc, char **&argv) {
     --argc;
     ++argv;
 
-    if (checkDir(opts->rootDir)) result = initFS(NULL, opts);
+    auto ctx = std::make_shared<EncFS_Context>();
+    ctx->publicFilesystem = opts->ownerCreate;
+    if (checkDir(opts->rootDir)) result = initFS(ctx.get(), opts);
 
     if (!result)
       cerr << _("Unable to initialize encrypted filesystem - check path.\n");
@@ -266,7 +272,10 @@ static RootPtr initRootInfo(const char *crootDir) {
     opts->rootDir = rootDir;
     opts->createIfNotFound = false;
     opts->checkKey = false;
-    result = initFS(NULL, opts);
+
+    auto ctx = std::make_shared<EncFS_Context>();
+    ctx->publicFilesystem = opts->ownerCreate;
+    result = initFS(ctx.get(), opts);
   }
 
   if (!result)
@@ -367,13 +376,19 @@ template <typename T>
 int processContents(const std::shared_ptr<EncFS_Root> &rootInfo,
                     const char *path, T &op) {
   int errCode = 0;
-  std::shared_ptr<FileNode> node =
+  std::shared_ptr<FileNode> node;
-      rootInfo->root->openNode(path, "encfsctl", O_RDONLY, &errCode);
+
+  try {
+    node = rootInfo->root->openNode(path, "encfsctl", O_RDONLY, &errCode);
+  }
+  catch(...) {}
 
   if (!node) {
     // try treating filename as an enciphered path
     string plainName = rootInfo->root->plainPath(path);
+    if (plainName.length() > 0) {
       node = rootInfo->root->lookupNode(plainName.c_str(), "encfsctl");
+    }
     if (node) {
       errCode = node->open(O_RDONLY);
       if (errCode < 0) node.reset();

encfs/encfsctl.pod

@@ -18,9 +18,7 @@ encfsctl - administrative tool for working with EncFS filesystems
 
 B<encfsctl> [I<command> I<command_args>]
 
-B<encfsctl> I<rootdir>
+B<encfsctl> [info] I<rootdir>
-
-B<encfsctl> info I<rootdir>
 
 B<encfsctl> passwd I<rootdir>
 
@@ -30,6 +28,8 @@ B<encfsctl> decode [--extpass=prog] I<rootdir> [encoded name ...]
 
 B<encfsctl> encode [--extpass=prog] I<rootdir> [plaintext name ...]
 
+B<encfsctl> cat [--extpass=prog] [--reverse] I<rootdir> <(cipher|plain) filename>
+
 =head1 DESCRIPTION
 
 B<encfsctl> is an administrative tool for working with EncFS filesystems.  It
@@ -84,6 +84,12 @@ password - just like with encfs.
 If no names are specified on the command line, then a list of filenames
 will be read from stdin and encoded.
 
+=item B<cat>
+
+Decodes and B<cat>s the content of an encrypted file.  The filename can be
+given in a plain or ciphered form.  With B<--reverse> The file content will
+instead be encrypted.
+
 =back
 
 =head1 EXAMPLES

integration/reverse.t.pl

@@ -3,7 +3,7 @@
 # Test EncFS --reverse mode
 
 use warnings;
-use Test::More tests => 31;
+use Test::More tests => 34;
 use File::Path;
 use File::Temp;
 use IO::Handle;
@@ -101,6 +101,20 @@ sub copy_test
     ok(! -f "$decrypted/encfs.cpp", "file deleted");
 }
 
+# Encfsctl cat test
+sub encfsctl_cat_test
+{
+    my $contents = "hello world\n";
+    ok( open(OUT, "> $plain/hello.txt"), "create file for encfsctl cat test" );
+    print OUT $contents;
+    close OUT;
+    qx(ENCFS6_CONFIG=$plain/.encfs6.xml ./build/encfsctl cat --extpass="echo test" $ciphertext hello.txt > $plain/hellodec.txt);
+    qx(ENCFS6_CONFIG=$plain/.encfs6.xml ./build/encfsctl cat --extpass="echo test" --reverse $plain hello.txt > $plain/helloenc.txt);
+    my $cname = encName("hello.txt");
+    ok(system("diff -q $plain/helloenc.txt $ciphertext/$cname")==0, "encfsctl correctly encrypts");
+    ok(system("diff -q $plain/hello.txt $plain/hellodec.txt")==0, "encfsctl correctly decrypts");
+}
+
 # Create symlinks and verify they are correctly decrypted
 # Parameter: symlink target
 sub symlink_test
@@ -207,6 +221,7 @@ mount();
 grow();
 largeRead();
 copy_test();
+encfsctl_cat_test();
 symlink_test("/"); # absolute
 symlink_test("foo"); # relative
 symlink_test("/1/2/3/4/5/6/7/8/9/10/11/12/13/14/15/15/17/18"); # long