Add JSONLayout fuzzer

Signed-off-by: Adam Korczynski <[email protected]>

src/fuzzers/cpp/CMakeLists.txt

@@ -15,7 +15,7 @@
 # limitations under the License.
 #
 
-set(ALL_LOG4CXX_FUZZERS PatternLayoutFuzzer XMLLayoutFuzzer)
+set(ALL_LOG4CXX_FUZZERS PatternLayoutFuzzer XMLLayoutFuzzer JSONLayoutFuzzer)
 set(LOG4CXX_CHAR "utf-8")
 
 # Get the most recent Git commit ID

src/fuzzers/cpp/JSONLayoutFuzzer.cpp

@@ -0,0 +1,86 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "stdint.h"
+#include <log4cxx/logstring.h>
+#include <log4cxx/ndc.h>
+#include <log4cxx/helpers/stringhelper.h>
+#include <fuzzer/FuzzedDataProvider.h>
+#include <log4cxx/mdc.h>
+#include <log4cxx/jsonlayout.h>
+
+using namespace log4cxx;
+using namespace log4cxx::helpers;
+using namespace log4cxx::spi;
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
+	// Setup JSONLayout
+	JSONLayout layout;
+
+	FuzzedDataProvider fdp(data, size);
+
+	// Optional locationinfo
+	if (fdp.ConsumeBool()) {
+		layout.setOption(LOG4CXX_STR("LOCATIONINFO"), LOG4CXX_STR("locationinfo"));
+	}
+	// Optional threadinfo
+	if (fdp.ConsumeBool()) {
+		layout.setOption(LOG4CXX_STR("THREADINFO"), LOG4CXX_STR("threadinfo"));
+	}
+	// Optional prettyprint
+	if (fdp.ConsumeBool()) {
+		layout.setOption(LOG4CXX_STR("PRETTYPRINT"), LOG4CXX_STR("prettyprint"));
+	}
+
+	// Create random strings we need later
+	std::string key1 = fdp.ConsumeRandomLengthString();
+	std::string val1 = fdp.ConsumeRandomLengthString();
+	std::string key2 = fdp.ConsumeRandomLengthString();
+	std::string val2 = fdp.ConsumeRandomLengthString();
+	std::string key3 = fdp.ConsumeRandomLengthString();
+	std::string val3 = fdp.ConsumeRandomLengthString();
+	std::string key4 = fdp.ConsumeRandomLengthString();
+	std::string val4 = fdp.ConsumeRandomLengthString();
+	std::string ndcMessage = fdp.ConsumeRandomLengthString();
+	std::string loggerStr = fdp.ConsumeRandomLengthString();
+	std::string content = fdp.ConsumeRemainingBytesAsString();
+
+	log4cxx::LogString logger = LOG4CXX_STR(loggerStr);
+	log4cxx::LevelPtr level = log4cxx::Level::getInfo();
+	log4cxx::NDC::push(ndcMessage);
+	log4cxx::spi::LoggingEventPtr event = log4cxx::spi::LoggingEventPtr(
+		new log4cxx::spi::LoggingEvent(
+			logger, level, LOG4CXX_STR(content), LOG4CXX_LOCATION));
+
+	// Set properties
+	event->setProperty(LOG4CXX_STR(key1), LOG4CXX_STR(val1));
+	event->setProperty(LOG4CXX_STR(key2), LOG4CXX_STR(val2));
+
+	// Set MDC
+	log4cxx::MDC::put(key3, val3);
+	log4cxx::MDC::put(key4, val4);
+
+	// Call the target API
+	log4cxx::helpers::Pool p;
+	log4cxx::LogString result;
+	layout.format(result, event, p);
+
+	// Clean up
+	log4cxx::NDC::clear();
+	log4cxx::MDC::clear();
+  	return 0;
+}