1 /*
2  * Copyright (c) 2022-2022 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 "datachannelstub_fuzzer.h"
17 
18 #include <cstddef>
19 #include <cstdint>
20 
21 #include "global.h"
22 #include "input_data_channel_stub.h"
23 #include "message_parcel.h"
24 
25 using namespace OHOS::MiscServices;
26 namespace OHOS {
27 constexpr size_t THRESHOLD = 10;
28 constexpr int32_t OFFSET = 4;
29 const std::u16string DATACHANNEL_INTERFACE_TOKEN = u"ohos.miscservices.inputmethod.IInputDataChannel";
30 
ConvertToUint32(const uint8_t * ptr)31 uint32_t ConvertToUint32(const uint8_t *ptr)
32 {
33     if (ptr == nullptr) {
34         return 0;
35     }
36     uint32_t bigVar = (ptr[0] << 24) | (ptr[1] << 16) | (ptr[2] << 8) | (ptr[3]);
37     return bigVar;
38 }
FuzzDataChannelStub(const uint8_t * rawData,size_t size)39 bool FuzzDataChannelStub(const uint8_t *rawData, size_t size)
40 {
41     uint32_t code = ConvertToUint32(rawData);
42     rawData = rawData + OFFSET;
43     size = size - OFFSET;
44 
45     MessageParcel data;
46     data.WriteInterfaceToken(DATACHANNEL_INTERFACE_TOKEN);
47     data.WriteBuffer(rawData, size);
48     data.RewindRead(0);
49     MessageParcel reply;
50     MessageOption option;
51 
52     sptr<InputDataChannelStub> channelStub = new InputDataChannelStub();
53     channelStub->OnRemoteRequest(code, data, reply, option);
54 
55     return true;
56 }
57 } // namespace OHOS
58 /* Fuzzer entry point */
LLVMFuzzerTestOneInput(const uint8_t * data,size_t size)59 extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
60 {
61     if (size < OHOS::THRESHOLD) {
62         return 0;
63     }
64     /* Run your code on data */
65     OHOS::FuzzDataChannelStub(data, size);
66     return 0;
67 }