SERVER-26703 reject commands exceeding the BSON depth limit

Any command sent to the server that exceeds the depth limit will fail. This also prevents users from
inserting documents that exceed the depth limit.

(cherry picked from commit d98143c5db73a8a9a49ef20e9e0f2732b4de5063)

1 files changed, 43 insertions, 0 deletions

diff --git a/src/mongo/bson/bson_depth.cpp b/src/mongo/bson/bson_depth.cpp
new file mode 100644
index 00000000000..153d53d85ef
--- /dev/null
+++ b/src/mongo/bson/bson_depth.cpp
@@ -0,0 +1,43 @@
+/**
+ * Copyright (C) 2017 MongoDB Inc.
+ *
+ * This program is free software: you can redistribute it and/or  modify
+ * it under the terms of the GNU Affero General Public License, version 3,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * As a special exception, the copyright holders give permission to link the
+ * code of portions of this program with the OpenSSL library under certain
+ * conditions as described in each individual source file and distribute
+ * linked combinations including the program with the OpenSSL library. You
+ * must comply with the GNU Affero General Public License in all respects
+ * for all of the code used other than as permitted herein. If you modify
+ * file(s) with this exception, you may extend this exception to your
+ * version of the file(s), but you are not obligated to do so. If you do not
+ * wish to do so, delete this exception statement from your version. If you
+ * delete this exception statement from all source files in the program,
+ * then also delete it in the license file.
+ */
+
+#include "mongo/platform/basic.h"
+
+#include "mongo/bson/bson_depth.h"
+
+namespace mongo {
+constexpr std::int32_t BSONDepth::kDefaultMaxAllowableDepth;
+constexpr std::int32_t BSONDepth::kBSONDepthParameterFloor;
+constexpr std::int32_t BSONDepth::kBSONDepthParameterCeiling;
+
+std::int32_t BSONDepth::maxAllowableDepth = BSONDepth::kDefaultMaxAllowableDepth;
+
+std::uint32_t BSONDepth::getMaxAllowableDepth() {
+    return static_cast<std::uint32_t>(BSONDepth::maxAllowableDepth);
+}
+}  // namespace mongo