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// Copyright 2020 Google LLC
//
// Licensed 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
//
// https://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.
// cppdap fuzzer program.
// Run with: ${CPPDAP_PATH}/fuzz/run.sh
// Requires modern clang toolchain.
#include "content_stream.h"
#include "string_buffer.h"
#include "dap/protocol.h"
#include "dap/session.h"
#include "fuzz.h"
#include <condition_variable>
#include <mutex>
namespace {
// Event provides a basic wait and signal synchronization primitive.
class Event {
public:
// wait() blocks until the event is fired or the given timeout is reached.
template <typename DURATION>
inline void wait(const DURATION& duration) {
std::unique_lock<std::mutex> lock(mutex);
cv.wait_for(lock, duration, [&] { return fired; });
}
// fire() sets signals the event, and unblocks any calls to wait().
inline void fire() {
std::unique_lock<std::mutex> lock(mutex);
fired = true;
cv.notify_all();
}
private:
std::mutex mutex;
std::condition_variable cv;
bool fired = false;
};
} // namespace
// Fuzzing main function.
// See http://llvm.org/docs/LibFuzzer.html for details.
extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
// The first byte can optionally control fuzzing mode.
enum class ControlMode {
// Don't wrap the input data with a stream writer. Allows testing for stream
// writing.
TestStreamWriter,
// Don't append a 'done' request. This may cause the test to take longer to
// complete (it may have to block on a timeout), but exercises the
// unrecognised-message cases.
DontAppendDoneRequest,
// Number of control modes in this enum.
Count,
};
// Scan first byte for control mode.
bool useContentStreamWriter = true;
bool appendDoneRequest = true;
if (size > 0 && data[0] < static_cast<uint8_t>(ControlMode::Count)) {
useContentStreamWriter =
data[0] != static_cast<uint8_t>(ControlMode::TestStreamWriter);
appendDoneRequest =
data[0] != static_cast<uint8_t>(ControlMode::DontAppendDoneRequest);
data++;
size--;
}
// in contains the input data
auto in = std::make_shared<dap::StringBuffer>();
dap::ContentWriter writer(in);
if (useContentStreamWriter) {
writer.write(std::string(reinterpret_cast<const char*>(data), size));
} else {
in->write(data, size);
}
if (appendDoneRequest) {
writer.write(R"(
{
"seq": 10,
"type": "request",
"command": "done",
}
)");
}
// Each test is done if we receive a request, or report an error.
Event requestOrError;
#define DAP_REQUEST(REQUEST, RESPONSE) \
session->registerHandler([&](const REQUEST&) { \
requestOrError.fire(); \
return RESPONSE{}; \
});
auto session = dap::Session::create();
DAP_REQUEST_LIST();
session->onError([&](const char*) { requestOrError.fire(); });
auto out = std::make_shared<dap::StringBuffer>();
session->bind(dap::ReaderWriter::create(in, out));
// Give up after a second if we don't get a request or error reported.
requestOrError.wait(std::chrono::seconds(1));
return 0;
}
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