SERVER-41704 adding asn1 libfuzzer parser

Author: JPiao

src/mongo/util/net/SConscript

@@ -205,6 +205,17 @@ env.CppUnitTest(
     ],
 )
 
+env.CppLibfuzzerTest(
+    target='asn1_parser_fuzzer',
+    source=[
+        'asn1_parser_fuzzer.cpp',
+    ],
+    LIBDEPS=[
+        '$BUILD_DIR/mongo/base',
+        '$BUILD_DIR/mongo/util/net/ssl_manager',
+    ],
+)
+
 if get_option('ssl') == 'on':
     env.CppUnitTest(
         target='util_net_ssl_test',

src/mongo/util/net/asn1_parser_fuzzer.cpp

@@ -0,0 +1,37 @@
+/**
+ *    Copyright (C) 2019-present MongoDB, Inc.
+ *
+ *    This program is free software: you can redistribute it and/or modify
+ *    it under the terms of the Server Side Public License, version 1,
+ *    as published by MongoDB, Inc.
+ *
+ *    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
+ *    Server Side Public License for more details.
+ *
+ *    You should have received a copy of the Server Side Public License
+ *    along with this program. If not, see
+ *    <http://www.mongodb.com/licensing/server-side-public-license>.
+ *
+ *    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 Server Side 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/base/data_range.h"
+#include "mongo/util/net/ssl_manager.h"
+
+extern "C" int LLVMFuzzerTestOneInput(const char* Data, size_t Size) {
+    mongo::ConstDataRange dr = mongo::ConstDataRange(Data, Size);
+    auto ret = mongo::parsePeerRoles(dr);
+    return 0;
+}