Add "split_ntfs_stream_name()" together with a torture test

(This used to be commit d813bd9e02d9baf916eb96c478be89f0c435e07c)

3 files changed, 162 insertions, 0 deletions

diff --git a/source3/lib/util.c b/source3/lib/util.c
index bc3eaa8d5e9..11f3660df80 100644
--- a/source3/lib/util.c
+++ b/source3/lib/util.c
@@ -3273,3 +3273,93 @@ void *talloc_zeronull(const void *context, size_t size, const char *name)
 	return talloc_named_const(context, size, name);
 }
 #endif
+
+/* Split a path name into filename and stream name components. Canonicalise
+ * such that an implicit $DATA token is always explicit.
+ *
+ * The "specification" of this function can be found in the
+ * run_local_stream_name() function in torture.c, I've tried those
+ * combinations against a W2k3 server.
+ */
+
+NTSTATUS split_ntfs_stream_name(TALLOC_CTX *mem_ctx, const char *fname,
+				char **pbase, char **pstream)
+{
+	char *base = NULL;
+	char *stream = NULL;
+	char *sname; /* stream name */
+	const char *stype; /* stream type */
+
+	DEBUG(10, ("split_ntfs_stream_name called for [%s]\n", fname));
+
+	sname = strchr_m(fname, ':');
+
+	if (lp_posix_pathnames() || (sname == NULL)) {
+		if (pbase != NULL) {
+			base = talloc_strdup(mem_ctx, fname);
+			NT_STATUS_HAVE_NO_MEMORY(base);
+		}
+		goto done;
+	}
+
+	if (pbase != NULL) {
+		base = talloc_strndup(mem_ctx, fname, PTR_DIFF(sname, fname));
+		NT_STATUS_HAVE_NO_MEMORY(base);
+	}
+
+	sname += 1;
+
+	stype = strchr_m(sname, ':');
+
+	if (stype == NULL) {
+		sname = talloc_strdup(mem_ctx, sname);
+		stype = "$DATA";
+	}
+	else {
+		if (StrCaseCmp(stype, ":$DATA") != 0) {
+			/*
+			 * If there is an explicit stream type, so far we only
+			 * allow $DATA. Is there anything else allowed? -- vl
+			 */
+			DEBUG(10, ("[%s] is an invalid stream type\n", stype));
+			TALLOC_FREE(base);
+			return NT_STATUS_OBJECT_NAME_INVALID;
+		}
+		sname = talloc_strndup(mem_ctx, sname, PTR_DIFF(stype, sname));
+		stype += 1;
+	}
+
+	if (sname == NULL) {
+		TALLOC_FREE(base);
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	if (sname[0] == '\0') {
+		/*
+		 * no stream name, so no stream
+		 */
+		goto done;
+	}
+
+	if (pstream != NULL) {
+		stream = talloc_asprintf(mem_ctx, "%s:%s", sname, stype);
+		if (stream == NULL) {
+			TALLOC_FREE(sname);
+			TALLOC_FREE(base);
+			return NT_STATUS_NO_MEMORY;
+		}
+		/*
+		 * upper-case the type field
+		 */
+		strupper_m(strchr_m(stream, ':')+1);
+	}
+
+ done:
+	if (pbase != NULL) {
+		*pbase = base;
+	}
+	if (pstream != NULL) {
+		*pstream = stream;
+	}
+	return NT_STATUS_OK;
+}
diff --git a/source3/smbd/nttrans.c b/source3/smbd/nttrans.c
index e8df732ea23..9381174af0c 100644
--- a/source3/smbd/nttrans.c
+++ b/source3/smbd/nttrans.c
@@ -271,6 +271,9 @@ void send_nt_replies(connection_struct *conn,
 
 /****************************************************************************
  Is it an NTFS stream name ?
+ An NTFS file name is <path>.<extention>:<stream name>:<stream type>
+ $DATA can be used as both a stream name and a stream type. A missing stream
+ name or type implies $DATA.
 ****************************************************************************/
 
 bool is_ntfs_stream_name(const char *fname)
diff --git a/source3/torture/torture.c b/source3/torture/torture.c
index 05b41413b47..070474cf6fb 100644
--- a/source3/torture/torture.c
+++ b/source3/torture/torture.c
@@ -5098,6 +5098,74 @@ static bool run_local_rbtree(int dummy)
 	return ret;
 }
 
+static bool test_stream_name(const char *fname, const char *expected_base,
+			     const char *expected_stream,
+			     NTSTATUS expected_status)
+{
+	NTSTATUS status;
+	char *base = NULL;
+	char *stream = NULL;
+
+	status = split_ntfs_stream_name(talloc_tos(), fname, &base, &stream);
+	if (!NT_STATUS_EQUAL(status, expected_status)) {
+		goto error;
+	}
+
+	if (!NT_STATUS_IS_OK(status)) {
+		return true;
+	}
+
+	if (base == NULL) goto error;
+
+	if (strcmp(expected_base, base) != 0) goto error;
+
+	if ((expected_stream != NULL) && (stream == NULL)) goto error;
+	if ((expected_stream == NULL) && (stream != NULL)) goto error;
+
+	if ((stream != NULL) && (strcmp(expected_stream, stream) != 0))
+		goto error;
+
+	TALLOC_FREE(base);
+	TALLOC_FREE(stream);
+	return true;
+
+ error:
+	d_fprintf(stderr, "test_stream(%s, %s, %s, %s)\n",
+		  fname, expected_base ? expected_base : "<NULL>",
+		  expected_stream ? expected_stream : "<NULL>",
+		  nt_errstr(expected_status));
+	d_fprintf(stderr, "-> base=%s, stream=%s, status=%s\n",
+		  base ? base : "<NULL>", stream ? stream : "<NULL>",
+		  nt_errstr(status));
+	TALLOC_FREE(base);
+	TALLOC_FREE(stream);
+	return false;
+}
+
+static bool run_local_stream_name(int dummy)
+{
+	bool ret = true;
+
+	ret &= test_stream_name(
+		"bla", "bla", NULL, NT_STATUS_OK);
+	ret &= test_stream_name(
+		"bla::$DATA", "bla", NULL, NT_STATUS_OK);
+	ret &= test_stream_name(
+		"bla:blub:", "bla", NULL, NT_STATUS_OBJECT_NAME_INVALID);
+	ret &= test_stream_name(
+		"bla::", NULL, NULL, NT_STATUS_OBJECT_NAME_INVALID);
+	ret &= test_stream_name(
+		"bla::123", "bla", NULL, NT_STATUS_OBJECT_NAME_INVALID);
+	ret &= test_stream_name(
+		"bla:$DATA", "bla", "$DATA:$DATA", NT_STATUS_OK);
+	ret &= test_stream_name(
+		"bla:x:$DATA", "bla", "x:$DATA", NT_STATUS_OK);
+	ret &= test_stream_name(
+		"bla:x", "bla", "x:$DATA", NT_STATUS_OK);
+
+	return ret;
+}
+
 static bool data_blob_equal(DATA_BLOB a, DATA_BLOB b)
 {
 	if (a.length != b.length) {
@@ -5328,6 +5396,7 @@ static struct {
 	{ "LOCAL-GENCACHE", run_local_gencache, 0},
 	{ "LOCAL-RBTREE", run_local_rbtree, 0},
 	{ "LOCAL-MEMCACHE", run_local_memcache, 0},
+	{ "LOCAL-STREAM-NAME", run_local_stream_name, 0},
 	{NULL, NULL, 0}};