1/*
2 * Copyright (c) 2022 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 *     http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16#include <cstddef>
17#include <cstdint>
18
19#include "hdf_log.h"
20#include "message_parcel.h"
21#include "usb_impl.h"
22#include "usbdevice_fuzzer.h"
23#include "v1_0/usb_interface_stub.h"
24
25using namespace OHOS::HDI::Usb::V1_0;
26
27namespace OHOS {
28constexpr size_t THRESHOLD = 10;
29constexpr int32_t OFFSET = 4;
30const std::u16string USB_INTERFACE_TOKEN = u"ohos.hdi.usb.v1_0.IUsbInterface";
31
32uint32_t Convert2Uint32(const uint8_t *ptr)
33{
34    if (ptr == nullptr) {
35        return 0;
36    }
37    /*
38     * Move the 0th digit 24 to the left, the first digit 16 to the left, the second digit 8 to the left,
39     * and the third digit no left
40     */
41    return (ptr[0] << 24) | (ptr[1] << 16) | (ptr[2] << 8) | (ptr[3]);
42}
43
44bool DoSomethingInterestingWithMyAPI(const uint8_t *rawData, size_t size)
45{
46    if (rawData == nullptr) {
47        return false;
48    }
49    uint32_t code = Convert2Uint32(rawData);
50    rawData = rawData + OFFSET;
51    size = size - OFFSET;
52
53    MessageParcel data;
54    data.WriteInterfaceToken(USB_INTERFACE_TOKEN);
55    data.WriteBuffer(rawData, size);
56    data.RewindRead(0);
57    MessageParcel reply;
58    MessageOption option;
59
60    sptr<IUsbInterface> g_usbInterface = IUsbInterface::Get(false);
61    if (g_usbInterface == nullptr) {
62        HDF_LOGE("%{public}s:IUsbInterface::Get() failed.", __func__);
63        return false;
64    }
65    sptr<UsbInterfaceStub> impl = new UsbInterfaceStub(g_usbInterface);
66    if (impl == nullptr) {
67        HDF_LOGE("%{public}s:new UsbInterfaceStub failed.", __func__);
68        return false;
69    }
70    impl->OnRemoteRequest(code, data, reply, option);
71
72    return true;
73}
74} // namespace OHOS
75
76/* Fuzzer entry point */
77extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
78{
79    if (size < OHOS::THRESHOLD) {
80        return 0;
81    }
82
83    /* Run your code on data */
84    OHOS::DoSomethingInterestingWithMyAPI(data, size);
85    return 0;
86}
87