Use sourcecode for libjuice

thirdparty/libjuice/fuzzer/README.md

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+## Fuzzer
+
+### Export Symbols
+```
+export CC=clang
+export CXX=clang++
+export CFLAGS=-fsanitize=fuzzer-no-link,address
+export LIB_FUZZING_ENGINE=-fsanitize=fuzzer
+export LDFLAGS=-fsanitize=address
+```
+
+### Build
+```
+$ mkdir build
+$ cd build
+$ cmake -DCMAKE_BUILD_TYPE=Debug -DFUZZER=ON -DCMAKE_C_COMPILER=$CC \
+-DCMAKE_C_FLAGS=$CFLAGS -DCMAKE_EXE_LINKER_FLAGS=$CFLAGS \
+-DLIB_FUZZING_ENGINE=$LIB_FUZZING_ENGINE \
+../
+```
+
+### Run
+```
+$ mkdir coverage
+$ ./fuzzer coverage/ ../fuzzer/input/
+```

thirdparty/libjuice/fuzzer/fuzzer.c

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+/**
+ * Copyright (c) 2022 0x34d (https://github.com/0x34d)
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <stdint.h>
+#include <string.h>
+
+#include "stun.h"
+
+#define kMinInputLength 5
+#define kMaxInputLength 2048
+
+extern int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
+
+	if (Size < kMinInputLength || Size > kMaxInputLength) {
+		return 0;
+	}
+
+	stun_message_t msg;
+	memset(&msg, 0, sizeof(msg));
+
+	_juice_is_stun_datagram((void *)Data, Size);
+	_juice_stun_read((void *)Data, Size, &msg);
+	_juice_stun_check_integrity((void *)Data, Size, &msg, "VOkJxbRl1RmTxUk/WvJxBt");
+
+	return 0;
+}