84 lines
2.6 KiB
C++
84 lines
2.6 KiB
C++
/*
|
|
__ _____ _____ _____
|
|
__| | __| | | | JSON for Modern C++ (fuzz test support)
|
|
| | |__ | | | | | | version 3.9.0
|
|
|_____|_____|_____|_|___| https://github.com/nlohmann/json
|
|
|
|
This file implements a parser test suitable for fuzz testing. Given a byte
|
|
array data, it performs the following steps:
|
|
|
|
- j1 = from_ubjson(data)
|
|
- vec = to_ubjson(j1)
|
|
- j2 = from_ubjson(vec)
|
|
- assert(j1 == j2)
|
|
- vec2 = to_ubjson(j1, use_size = true, use_type = false)
|
|
- j3 = from_ubjson(vec2)
|
|
- assert(j1 == j3)
|
|
- vec3 = to_ubjson(j1, use_size = true, use_type = true)
|
|
- j4 = from_ubjson(vec3)
|
|
- assert(j1 == j4)
|
|
|
|
The provided function `LLVMFuzzerTestOneInput` can be used in different fuzzer
|
|
drivers.
|
|
|
|
Licensed under the MIT License <http://opensource.org/licenses/MIT>.
|
|
*/
|
|
|
|
#include <iostream>
|
|
#include <sstream>
|
|
#include <nlohmann/json.hpp>
|
|
|
|
using json = nlohmann::json;
|
|
|
|
// see http://llvm.org/docs/LibFuzzer.html
|
|
extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size)
|
|
{
|
|
try
|
|
{
|
|
// step 1: parse input
|
|
std::vector<uint8_t> vec1(data, data + size);
|
|
json j1 = json::from_ubjson(vec1);
|
|
|
|
try
|
|
{
|
|
// step 2.1: round trip without adding size annotations to container types
|
|
std::vector<uint8_t> vec2 = json::to_ubjson(j1, false, false);
|
|
|
|
// step 2.2: round trip with adding size annotations but without adding type annonations to container types
|
|
std::vector<uint8_t> vec3 = json::to_ubjson(j1, true, false);
|
|
|
|
// step 2.3: round trip with adding size as well as type annotations to container types
|
|
std::vector<uint8_t> vec4 = json::to_ubjson(j1, true, true);
|
|
|
|
// parse serialization
|
|
json j2 = json::from_ubjson(vec2);
|
|
json j3 = json::from_ubjson(vec3);
|
|
json j4 = json::from_ubjson(vec4);
|
|
|
|
// serializations must match
|
|
assert(json::to_ubjson(j2, false, false) == vec2);
|
|
assert(json::to_ubjson(j3, true, false) == vec3);
|
|
assert(json::to_ubjson(j4, true, true) == vec4);
|
|
}
|
|
catch (const json::parse_error&)
|
|
{
|
|
// parsing a UBJSON serialization must not fail
|
|
assert(false);
|
|
}
|
|
}
|
|
catch (const json::parse_error&)
|
|
{
|
|
// parse errors are ok, because input may be random bytes
|
|
}
|
|
catch (const json::type_error&)
|
|
{
|
|
// type errors can occur during parsing, too
|
|
}
|
|
catch (const json::out_of_range&)
|
|
{
|
|
// out of range errors may happen if provided sizes are excessive
|
|
}
|
|
|
|
// return 0 - non-zero return values are reserved for future use
|
|
return 0;
|
|
}
|