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
28 namespace android {
29 namespace hardware {
30
hidl_binder_death_recipient(const sp<hidl_death_recipient> & recipient,uint64_t cookie,const sp<::android::hidl::base::V1_0::IBase> & base)31 hidl_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
binderDied(const wp<IBinder> &)36 void 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
getRecipient()44 wp<hidl_death_recipient> hidl_binder_death_recipient::getRecipient() {
45 return mRecipient;
46 }
47
48 const size_t hidl_memory::kOffsetOfHandle = offsetof(hidl_memory, mHandle);
49 const size_t hidl_memory::kOffsetOfName = offsetof(hidl_memory, mName);
50 static_assert(hidl_memory::kOffsetOfHandle == 0, "wrong offset");
51 static_assert(hidl_memory::kOffsetOfName == 24, "wrong offset");
52
readEmbeddedFromParcel(const hidl_memory & memory,const Parcel & parcel,size_t parentHandle,size_t parentOffset)53 status_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
writeEmbeddedToParcel(const hidl_memory & memory,Parcel * parcel,size_t parentHandle,size_t parentOffset)72 status_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 }
89 const size_t hidl_string::kOffsetOfBuffer = offsetof(hidl_string, mBuffer);
90 static_assert(hidl_string::kOffsetOfBuffer == 0, "wrong offset");
91
readEmbeddedFromParcel(const hidl_string & string,const Parcel & parcel,size_t parentHandle,size_t parentOffset)92 status_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
writeEmbeddedToParcel(const hidl_string & string,Parcel * parcel,size_t parentHandle,size_t parentOffset)116 status_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
writeToParcel(const hidl_version & version,android::hardware::Parcel & parcel)126 android::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
readFromParcel(const android::hardware::Parcel & parcel)130 hidl_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
readFromParcel(Status * s,const Parcel & parcel)140 status_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
writeToParcel(const Status & s,Parcel * parcel)182 status_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
configureBinderRpcThreadpool(size_t maxThreads,bool callerWillJoin)199 void configureBinderRpcThreadpool(size_t maxThreads, bool callerWillJoin) {
200 ProcessState::self()->setThreadPoolConfiguration(maxThreads, callerWillJoin /*callerJoinsPool*/);
201 }
202
joinBinderRpcThreadpool()203 void joinBinderRpcThreadpool() {
204 IPCThreadState::self()->joinThreadPool();
205 }
206
setupBinderPolling()207 int 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
handleBinderPoll()218 status_t handleBinderPoll() {
219 return IPCThreadState::self()->handlePolledCommands();
220 }
221
222 } // namespace hardware
223 } // namespace android
224