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https://github.com/nlohmann/json.git
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Niels Lohmann
c3068e9f95
Library: - add throw_cannot_use_with() for the 34 copies of type_error.304-312 "cannot use X with Y" - iter_impl: add throw_cannot_get_value() (invalid_iterator.214) - parser: add syntax_error() for the 12 parse_error.101 sites - ordered_map: share the four at() bodies via at_impl() - json_sax_dom_callback_parser: add pop_container() for end_object() and end_array() - binary_reader: build the two UBJSON/BJData length-type messages with concat() and last_byte_error() Tests: - move same_value(), the NDEBUG guard, and step 0 (parse without exceptions) of the seven fuzzer drivers into tests/src/fuzzer_common.hpp Signed-off-by: Niels Lohmann <mail@nlohmann.me>
87 lines
2.6 KiB
C++
87 lines
2.6 KiB
C++
// __ _____ _____ _____
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// __| | __| | | | JSON for Modern C++ (supporting code)
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// | | |__ | | | | | | version 3.12.0
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// |_____|_____|_____|_|___| https://github.com/nlohmann/json
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//
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// SPDX-FileCopyrightText: 2013-2026 Niels Lohmann <https://nlohmann.me>
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// SPDX-License-Identifier: MIT
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/*
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This file implements a parser test suitable for fuzz testing. Given a byte
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array data, it performs the following steps:
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- j0 = from_cbor(data, allow_exceptions = false)
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- j1 = from_cbor(data)
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- assert(j0 is discarded if parsing j1 fails, and j0 == j1 otherwise)
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- vec = to_cbor(j1)
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- j2 = from_cbor(vec)
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- assert(to_cbor(j2) == vec)
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The provided function `LLVMFuzzerTestOneInput` can be used in different fuzzer
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drivers.
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*/
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#include <cassert>
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#include <nlohmann/json.hpp>
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#include "fuzzer_common.hpp"
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using nlohmann::json;
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// see http://llvm.org/docs/LibFuzzer.html
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extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size)
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{
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std::vector<uint8_t> const vec1(data, data + size);
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// step 0: parse input without exceptions
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bool noexcept_threw = false;
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json const j_noexcept = parse_without_exceptions([&] { return json::from_cbor(vec1, true, false); }, noexcept_threw);
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// whether step 1 succeeded; if not, the catch blocks below check that
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// step 0 failed, too
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bool parsed = false;
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try
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{
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// step 1: parse input
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json const j1 = json::from_cbor(vec1);
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parsed = true;
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// without exceptions, the same input must give the same value
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assert(!noexcept_threw && !j_noexcept.is_discarded() && same_value(j_noexcept, j1));
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try
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{
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// step 2: round trip
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std::vector<uint8_t> const vec2 = json::to_cbor(j1);
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// parse serialization
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json const j2 = json::from_cbor(vec2);
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// serializations must match
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assert(json::to_cbor(j2) == vec2);
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}
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catch (const json::parse_error&)
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{
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// parsing a CBOR serialization must not fail
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assert(false);
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}
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}
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catch (const json::parse_error&)
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{
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// parse errors are ok, because input may be random bytes
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assert(parsed || noexcept_threw || j_noexcept.is_discarded());
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}
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catch (const json::type_error&)
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{
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// type errors can occur during parsing, too
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assert(parsed || noexcept_threw || j_noexcept.is_discarded());
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}
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catch (const json::out_of_range&)
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{
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// out of range errors can occur during parsing, too
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assert(parsed || noexcept_threw || j_noexcept.is_discarded());
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}
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// return 0 - non-zero return values are reserved for future use
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return 0;
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}
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