From 11cb25ee00ed858394fbf4103be2254ce13805e7 Mon Sep 17 00:00:00 2001
From: "Roger A. Light" <roger@atchoo.org>
Date: Sun, 12 Feb 2023 23:31:51 +0000
Subject: [PATCH] Fuzzing: utf8, pub, and sub checks.

---
 fuzzing/Makefile                          |  2 ++
 fuzzing/lib/Makefile                      | 29 +++++++++++++++++++++++
 fuzzing/lib/lib_fuzz_pub_topic_check2.cpp | 24 +++++++++++++++++++
 fuzzing/lib/lib_fuzz_sub_topic_check2.cpp | 24 +++++++++++++++++++
 fuzzing/lib/lib_fuzz_utf8.cpp             | 24 +++++++++++++++++++
 5 files changed, 103 insertions(+)
 create mode 100644 fuzzing/lib/Makefile
 create mode 100644 fuzzing/lib/lib_fuzz_pub_topic_check2.cpp
 create mode 100644 fuzzing/lib/lib_fuzz_sub_topic_check2.cpp
 create mode 100644 fuzzing/lib/lib_fuzz_utf8.cpp

diff --git a/fuzzing/Makefile b/fuzzing/Makefile
index 1428e670..7dc36914 100644
--- a/fuzzing/Makefile
+++ b/fuzzing/Makefile
@@ -5,6 +5,7 @@ all:
 	zip -r corpora/db_dump_seed_corpus.zip ../test/apps/db_dump/data/
 	$(MAKE) -C broker $@
 	$(MAKE) -C db_dump $@
+	$(MAKE) -C lib $@
 
 clean:
 	-rm -rf corpora/broker corpora/client
@@ -12,3 +13,4 @@ clean:
 	-rm -f corpora/db_dump_seed_corpus.zip
 	$(MAKE) -C broker $@
 	$(MAKE) -C db_dump $@
+	$(MAKE) -C lib $@
diff --git a/fuzzing/lib/Makefile b/fuzzing/lib/Makefile
new file mode 100644
index 00000000..ea623828
--- /dev/null
+++ b/fuzzing/lib/Makefile
@@ -0,0 +1,29 @@
+R=../..
+.PHONY: all clean
+
+FUZZERS:= \
+	lib_fuzz_pub_topic_check2 \
+	lib_fuzz_sub_topic_check2 \
+	lib_fuzz_utf8
+
+LOCAL_CPPFLAGS:=$(CPPFLAGS) -I${R}/include/
+LOCAL_CXXFLAGS:=$(CXXFLAGS) -g -Wall -Werror -pthread
+LOCAL_LDFLAGS:=$(LDFLAGS)
+LOCAL_LIBADD:=$(LIBADD) $(LIB_FUZZING_ENGINE) ${R}/lib/libmosquitto.a -lssl -lcrypto
+
+all: $(FUZZERS)
+
+lib_fuzz_pub_topic_check2 : lib_fuzz_pub_topic_check2.cpp
+	$(CXX) $(LOCAL_CXXFLAGS) $(LOCAL_CPPFLAGS) $(LOCAL_LDFLAGS) -o $@ $^ $(LOCAL_LIBADD)
+	install $@ ${OUT}/$@
+
+lib_fuzz_sub_topic_check2 : lib_fuzz_sub_topic_check2.cpp
+	$(CXX) $(LOCAL_CXXFLAGS) $(LOCAL_CPPFLAGS) $(LOCAL_LDFLAGS) -o $@ $^ $(LOCAL_LIBADD)
+	install $@ ${OUT}/$@
+
+lib_fuzz_utf8 : lib_fuzz_utf8.cpp
+	$(CXX) $(LOCAL_CXXFLAGS) $(LOCAL_CPPFLAGS) $(LOCAL_LDFLAGS) -o $@ $^ $(LOCAL_LIBADD)
+	install $@ ${OUT}/$@
+
+clean:
+	rm -f *.o $(FUZZERS)
diff --git a/fuzzing/lib/lib_fuzz_pub_topic_check2.cpp b/fuzzing/lib/lib_fuzz_pub_topic_check2.cpp
new file mode 100644
index 00000000..88bed4bb
--- /dev/null
+++ b/fuzzing/lib/lib_fuzz_pub_topic_check2.cpp
@@ -0,0 +1,24 @@
+/*
+Copyright (c) 2023 Cedalo GmbH
+
+All rights reserved. This program and the accompanying materials
+are made available under the terms of the Eclipse Public License 2.0
+and Eclipse Distribution License v1.0 which accompany this distribution.
+
+The Eclipse Public License is available at
+   https://www.eclipse.org/legal/epl-2.0/
+and the Eclipse Distribution License is available at
+  http://www.eclipse.org/org/documents/edl-v10.php.
+
+SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
+
+Contributors:
+   Roger Light - initial implementation and documentation.
+*/
+#include <mosquitto.h>
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
+{
+	mosquitto_pub_topic_check2((const char *)data, size);
+	return 0;
+}
diff --git a/fuzzing/lib/lib_fuzz_sub_topic_check2.cpp b/fuzzing/lib/lib_fuzz_sub_topic_check2.cpp
new file mode 100644
index 00000000..329dea8d
--- /dev/null
+++ b/fuzzing/lib/lib_fuzz_sub_topic_check2.cpp
@@ -0,0 +1,24 @@
+/*
+Copyright (c) 2023 Cedalo GmbH
+
+All rights reserved. This program and the accompanying materials
+are made available under the terms of the Eclipse Public License 2.0
+and Eclipse Distribution License v1.0 which accompany this distribution.
+
+The Eclipse Public License is available at
+   https://www.eclipse.org/legal/epl-2.0/
+and the Eclipse Distribution License is available at
+  http://www.eclipse.org/org/documents/edl-v10.php.
+
+SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
+
+Contributors:
+   Roger Light - initial implementation and documentation.
+*/
+#include <mosquitto.h>
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
+{
+	mosquitto_sub_topic_check2((const char *)data, size);
+	return 0;
+}
diff --git a/fuzzing/lib/lib_fuzz_utf8.cpp b/fuzzing/lib/lib_fuzz_utf8.cpp
new file mode 100644
index 00000000..ed39dc07
--- /dev/null
+++ b/fuzzing/lib/lib_fuzz_utf8.cpp
@@ -0,0 +1,24 @@
+/*
+Copyright (c) 2023 Cedalo GmbH
+
+All rights reserved. This program and the accompanying materials
+are made available under the terms of the Eclipse Public License 2.0
+and Eclipse Distribution License v1.0 which accompany this distribution.
+
+The Eclipse Public License is available at
+   https://www.eclipse.org/legal/epl-2.0/
+and the Eclipse Distribution License is available at
+  http://www.eclipse.org/org/documents/edl-v10.php.
+
+SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
+
+Contributors:
+   Roger Light - initial implementation and documentation.
+*/
+#include <mosquitto.h>
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
+{
+	mosquitto_validate_utf8((const char *)data, size);
+	return 0;
+}