test/fuzz/device/net/src/fuzz.cc

/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2022 Nathaniel Brough
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 */

#include <cassert>
#include <fuzzer/FuzzedDataProvider.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "class/cdc/cdc_device.h"
#include "class/net/net_device.h"
#include "fuzz/fuzz.h"
#include "tusb.h"
#include <cstdint>
#include <string>
#include <vector>

extern "C" {

#define FUZZ_ITERATIONS 500

//--------------------------------------------------------------------+
// MACRO CONSTANT TYPEDEF PROTYPES
//--------------------------------------------------------------------+

void net_task(FuzzedDataProvider *provider);

extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
  FuzzedDataProvider provider(Data, Size);
  std::vector<uint8_t> callback_data = provider.ConsumeBytes<uint8_t>(
      provider.ConsumeIntegralInRange<size_t>(0, Size));
  fuzz_init(callback_data.data(), callback_data.size());
  // init device stack on configured roothub port
  tusb_rhport_init_t dev_init = {
    .role = TUSB_ROLE_DEVICE,
    .speed = TUSB_SPEED_AUTO
  };
  tusb_init(BOARD_TUD_RHPORT, &dev_init);

  for (int i = 0; i < FUZZ_ITERATIONS; i++) {
    if (provider.remaining_bytes() == 0) {
      return 0;
    }
    tud_int_handler(provider.ConsumeIntegral<uint8_t>());
    tud_task(); // tinyusb device task
    net_task(&provider);
  }

  return 0;
}

//--------------------------------------------------------------------+
// USB CDC
//--------------------------------------------------------------------+
enum NetApiFuncs {
  kNetworkRecvRenew,
  kNetworkCanXmit,
  kNetworkXmit,
  kMaxValue,
};

void net_task(FuzzedDataProvider *provider) {

  assert(provider != NULL);
  switch (provider->ConsumeEnum<NetApiFuncs>()) {

  case kNetworkRecvRenew:
    tud_network_recv_renew();
    break;
  case kNetworkCanXmit:
 (void)tud_network_can_xmit(provider->ConsumeIntegral<uint16_t>());
  case kNetworkXmit:
    // TODO: Actually pass real values here later.
    tud_network_xmit(NULL, 0);

  case kMaxValue:
    // Noop.
    break;
  }
}
}