Merge pull request #2391 from owncloud/ignore_windows_reserved_characters

Ignore reserved words on Windows

csync/src/csync_exclude.c

@@ -156,6 +156,40 @@ CSYNC_EXCLUDE_TYPE csync_excluded(CSYNC *ctx, const char *path, int filetype) {
     return match;
 }
 
+// See http://support.microsoft.com/kb/74496
+static const char *win_reserved_words[] = {"CON","PRN","AUX", "NUL",
+                                           "COM1", "COM2", "COM3", "COM4",
+                                           "LPT1", "LPT2", "LPT3", "CLOCK$" };
+
+
+bool csync_is_windows_reserved_word(const char* filename) {
+
+  size_t win_reserve_words_len = sizeof(win_reserved_words) / sizeof(char*);
+  size_t j;
+
+  for (j = 0; j < win_reserve_words_len; j++) {
+    int len_reserved_word = strlen(win_reserved_words[j]);
+    int len_filename = strlen(filename);
+    if (len_filename == 2 && filename[1] == ':') {
+        if (filename[0] >= 'a' && filename[0] <= 'z') {
+            return true;
+        }
+        if (filename[0] >= 'A' && filename[0] <= 'Z') {
+            return true;
+        }
+    }
+    if (c_strncasecmp(filename, win_reserved_words[j], len_reserved_word) == 0) {
+        if (len_filename == len_reserved_word) {
+            return true;
+        }
+        if ((len_filename > len_reserved_word) && (filename[len_reserved_word] == '.')) {
+            return true;
+        }
+    }
+  }
+  return false;
+}
+
 CSYNC_EXCLUDE_TYPE csync_excluded_no_ctx(c_strlist_t *excludes, const char *path, int filetype) {
   size_t i = 0;
   const char *p = NULL;
@@ -214,6 +248,13 @@ CSYNC_EXCLUDE_TYPE csync_excluded_no_ctx(c_strlist_t *excludes, const char *path
       SAFE_FREE(dname);
       goto out;
   }
+
+  if (csync_is_windows_reserved_word(bname)) {
+    match = CSYNC_FILE_EXCLUDE_INVALID_CHAR;
+    SAFE_FREE(bname);
+    SAFE_FREE(dname);
+    goto out;
+  }
 #endif
 
   rc = csync_fnmatch(".owncloudsync.log*", bname, 0);

csync/src/csync_exclude.h

@@ -80,4 +80,12 @@ CSYNC_EXCLUDE_TYPE csync_excluded(CSYNC *ctx, const char *path, int filetype);
 CSYNC_EXCLUDE_TYPE csync_excluded_no_ctx(c_strlist_t *excludes, const char *path, int filetype);
 #endif /* _CSYNC_EXCLUDE_H */
 
+/**
+ * @brief Checks if filename is considered reserved by Windows
+ * @param file_name filename
+ * @return true if file is reserved, false otherwise
+ */
+bool csync_is_windows_reserved_word(const char *file_name);
+
+
 /* vim: set ft=c.doxygen ts=8 sw=2 et cindent: */

csync/src/std/c_string.c

@@ -134,6 +134,14 @@ static char *c_iconv(const char* str, enum iconv_direction dir)
 }
 #endif /* defined(HAVE_ICONV) && defined(WITH_ICONV) */
 
+int c_strncasecmp(const char *a, const char *b, size_t n) {
+#ifdef _WIN32
+    return _strnicmp(a, b, n);
+#else
+    return strncasecmp(a, b, n);
+#endif
+}
+
 int c_streq(const char *a, const char *b) {
   register const char *s1 = a;
   register const char *s2 = b;

csync/src/std/c_string.h

@@ -59,6 +59,17 @@ struct c_strlist_s {
   size_t size;
 };
 
+/**
+ * @brief Compare to strings case insensitively.
+ *
+ * @param a  First string to compare.
+ * @param b  Second string to compare.
+ * @param n  Max comparison length.
+ *
+ * @return see strncasecmp
+ */
+int c_strncasecmp(const char *a, const char *b, size_t n);
+
 /**
  * @brief Compare to strings if they are equal.
  *

csync/tests/csync_tests/check_csync_exclude.c

@@ -174,6 +174,25 @@ static void check_csync_pathes(void **state)
     assert_int_equal(rc, CSYNC_NOT_EXCLUDED);
 }
 
+static void check_csync_is_windows_reserved_word() {
+    assert_true(csync_is_windows_reserved_word("CON"));
+    assert_true(csync_is_windows_reserved_word("con"));
+    assert_true(csync_is_windows_reserved_word("CON."));
+    assert_true(csync_is_windows_reserved_word("con."));
+    assert_true(csync_is_windows_reserved_word("CON.ference"));
+    assert_false(csync_is_windows_reserved_word("CONference"));
+    assert_false(csync_is_windows_reserved_word("conference"));
+    assert_false(csync_is_windows_reserved_word("conf.erence"));
+    assert_false(csync_is_windows_reserved_word("co"));
+    assert_true(csync_is_windows_reserved_word("A:"));
+    assert_true(csync_is_windows_reserved_word("a:"));
+    assert_true(csync_is_windows_reserved_word("z:"));
+    assert_true(csync_is_windows_reserved_word("Z:"));
+    assert_true(csync_is_windows_reserved_word("M:"));
+    assert_true(csync_is_windows_reserved_word("m:"));
+
+}
+
 int torture_run_tests(void)
 {
     const UnitTest tests[] = {
@@ -181,6 +200,7 @@ int torture_run_tests(void)
         unit_test_setup_teardown(check_csync_exclude_load, setup, teardown),
         unit_test_setup_teardown(check_csync_excluded, setup_init, teardown),
         unit_test_setup_teardown(check_csync_pathes, setup_init, teardown),
+        unit_test_setup_teardown(check_csync_is_windows_reserved_word, setup_init, teardown),
     };
 
     return run_tests(tests);