1/*
2 * Copyright (C) 2016 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#define LOG_TAG "HidlSupport"
18
19#include <hidl/HidlBinderSupport.h>
20
21// C includes
22#include <unistd.h>
23
24// C++ includes
25#include <fstream>
26#include <sstream>
27
28namespace android {
29namespace hardware {
30
31hidl_binder_death_recipient::hidl_binder_death_recipient(const sp<hidl_death_recipient> &recipient,
32        uint64_t cookie, const sp<::android::hidl::base::V1_0::IBase> &base) :
33    mRecipient(recipient), mCookie(cookie), mBase(base) {
34}
35
36void hidl_binder_death_recipient::binderDied(const wp<IBinder>& /*who*/) {
37    sp<hidl_death_recipient> recipient = mRecipient.promote();
38    if (recipient != nullptr && mBase != nullptr) {
39        recipient->serviceDied(mCookie, mBase);
40    }
41    mBase = nullptr;
42}
43
44wp<hidl_death_recipient> hidl_binder_death_recipient::getRecipient() {
45    return mRecipient;
46}
47
48const size_t hidl_memory::kOffsetOfHandle = offsetof(hidl_memory, mHandle);
49const size_t hidl_memory::kOffsetOfName = offsetof(hidl_memory, mName);
50static_assert(hidl_memory::kOffsetOfHandle == 0, "wrong offset");
51static_assert(hidl_memory::kOffsetOfName == 24, "wrong offset");
52
53status_t readEmbeddedFromParcel(const hidl_memory& memory,
54        const Parcel &parcel, size_t parentHandle, size_t parentOffset) {
55    const native_handle_t *handle;
56    ::android::status_t _hidl_err = parcel.readNullableEmbeddedNativeHandle(
57            parentHandle,
58            parentOffset + hidl_memory::kOffsetOfHandle,
59            &handle);
60
61    if (_hidl_err == ::android::OK) {
62        _hidl_err = readEmbeddedFromParcel(
63                memory.name(),
64                parcel,
65                parentHandle,
66                parentOffset + hidl_memory::kOffsetOfName);
67    }
68
69    return _hidl_err;
70}
71
72status_t writeEmbeddedToParcel(const hidl_memory &memory,
73        Parcel *parcel, size_t parentHandle, size_t parentOffset) {
74    status_t _hidl_err = parcel->writeEmbeddedNativeHandle(
75            memory.handle(),
76            parentHandle,
77            parentOffset + hidl_memory::kOffsetOfHandle);
78
79    if (_hidl_err == ::android::OK) {
80        _hidl_err = writeEmbeddedToParcel(
81            memory.name(),
82            parcel,
83            parentHandle,
84            parentOffset + hidl_memory::kOffsetOfName);
85    }
86
87    return _hidl_err;
88}
89const size_t hidl_string::kOffsetOfBuffer = offsetof(hidl_string, mBuffer);
90static_assert(hidl_string::kOffsetOfBuffer == 0, "wrong offset");
91
92status_t readEmbeddedFromParcel(const hidl_string &string ,
93        const Parcel &parcel, size_t parentHandle, size_t parentOffset) {
94    const void *out;
95
96    status_t status = parcel.readEmbeddedBuffer(
97            string.size() + 1,
98            nullptr /* buffer_handle */,
99            parentHandle,
100            parentOffset + hidl_string::kOffsetOfBuffer,
101            &out);
102
103    if (status != OK) {
104        return status;
105    }
106
107    // Always safe to access out[string.size()] because we read size+1 bytes
108    if (static_cast<const char *>(out)[string.size()] != '\0') {
109        ALOGE("Received unterminated hidl_string buffer.");
110        return BAD_VALUE;
111    }
112
113    return OK;
114}
115
116status_t writeEmbeddedToParcel(const hidl_string &string,
117        Parcel *parcel, size_t parentHandle, size_t parentOffset) {
118    return parcel->writeEmbeddedBuffer(
119            string.c_str(),
120            string.size() + 1,
121            nullptr /* handle */,
122            parentHandle,
123            parentOffset + hidl_string::kOffsetOfBuffer);
124}
125
126android::status_t writeToParcel(const hidl_version &version, android::hardware::Parcel& parcel) {
127    return parcel.writeUint32(static_cast<uint32_t>(version.get_major()) << 16 | version.get_minor());
128}
129
130hidl_version* readFromParcel(const android::hardware::Parcel& parcel) {
131    uint32_t version;
132    android::status_t status = parcel.readUint32(&version);
133    if (status != OK) {
134        return nullptr;
135    } else {
136        return new hidl_version(version >> 16, version & 0xFFFF);
137    }
138}
139
140status_t readFromParcel(Status *s, const Parcel& parcel) {
141    int32_t exception;
142    status_t status = parcel.readInt32(&exception);
143    if (status != OK) {
144        s->setFromStatusT(status);
145        return status;
146    }
147
148    // Skip over fat response headers.  Not used (or propagated) in native code.
149    if (exception == Status::EX_HAS_REPLY_HEADER) {
150        // Note that the header size includes the 4 byte size field.
151        const int32_t header_start = parcel.dataPosition();
152        int32_t header_size;
153        status = parcel.readInt32(&header_size);
154        if (status != OK) {
155            s->setFromStatusT(status);
156            return status;
157        }
158        parcel.setDataPosition(header_start + header_size);
159        // And fat response headers are currently only used when there are no
160        // exceptions, so act like there was no error.
161        exception = Status::EX_NONE;
162    }
163
164    if (exception == Status::EX_NONE) {
165        *s = Status::ok();
166        return status;
167    }
168
169    // The remote threw an exception.  Get the message back.
170    String16 message;
171    status = parcel.readString16(&message);
172    if (status != OK) {
173        s->setFromStatusT(status);
174        return status;
175    }
176
177    s->setException(exception, String8(message));
178
179    return status;
180}
181
182status_t writeToParcel(const Status &s, Parcel* parcel) {
183    // Something really bad has happened, and we're not going to even
184    // try returning rich error data.
185    if (s.exceptionCode() == Status::EX_TRANSACTION_FAILED) {
186        return s.transactionError();
187    }
188
189    status_t status = parcel->writeInt32(s.exceptionCode());
190    if (status != OK) { return status; }
191    if (s.exceptionCode() == Status::EX_NONE) {
192        // We have no more information to write.
193        return status;
194    }
195    status = parcel->writeString16(String16(s.exceptionMessage()));
196    return status;
197}
198
199void configureBinderRpcThreadpool(size_t maxThreads, bool callerWillJoin) {
200    ProcessState::self()->setThreadPoolConfiguration(maxThreads, callerWillJoin /*callerJoinsPool*/);
201}
202
203void joinBinderRpcThreadpool() {
204    IPCThreadState::self()->joinThreadPool();
205}
206
207int setupBinderPolling() {
208    int fd;
209    int err = IPCThreadState::self()->setupPolling(&fd);
210
211    if (err != OK) {
212        ALOGE("Failed to setup binder polling: %d (%s)", err, strerror(err));
213    }
214
215    return err == OK ? fd : -1;
216}
217
218status_t handleBinderPoll() {
219    return IPCThreadState::self()->handlePolledCommands();
220}
221
222}  // namespace hardware
223}  // namespace android
224