Yifan Hong | 7f97f44 | 2016-11-14 18:31:05 -0800 | [diff] [blame] | 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 | #ifndef ANDROID_HIDL_BINDER_SUPPORT_H |
| 18 | #define ANDROID_HIDL_BINDER_SUPPORT_H |
| 19 | |
| 20 | #include <hidl/HidlSupport.h> |
| 21 | #include <hidl/MQDescriptor.h> |
Yifan Hong | b2c9c75 | 2016-12-07 15:15:41 -0800 | [diff] [blame] | 22 | #include <hidl/Static.h> |
Yifan Hong | 7f97f44 | 2016-11-14 18:31:05 -0800 | [diff] [blame] | 23 | #include <hwbinder/IBinder.h> |
| 24 | #include <hwbinder/Parcel.h> |
| 25 | |
| 26 | // Defines functions for hidl_string, hidl_version, Status, hidl_vec, MQDescriptor, |
| 27 | // etc. to interact with Parcel. |
| 28 | |
| 29 | namespace android { |
| 30 | namespace hardware { |
| 31 | |
Martijn Coenen | 3079100 | 2016-12-01 15:40:46 +0100 | [diff] [blame] | 32 | // ---------------------- hidl_memory |
| 33 | |
| 34 | status_t readEmbeddedFromParcel(hidl_memory *memory, |
| 35 | const Parcel &parcel, size_t parentHandle, size_t parentOffset); |
| 36 | |
| 37 | status_t writeEmbeddedToParcel(const hidl_memory &memory, |
| 38 | Parcel *parcel, size_t parentHandle, size_t parentOffset); |
| 39 | |
Yifan Hong | 7f97f44 | 2016-11-14 18:31:05 -0800 | [diff] [blame] | 40 | // ---------------------- hidl_string |
| 41 | |
| 42 | status_t readEmbeddedFromParcel(hidl_string *string, |
| 43 | const Parcel &parcel, size_t parentHandle, size_t parentOffset); |
| 44 | |
| 45 | status_t writeEmbeddedToParcel(const hidl_string &string, |
| 46 | Parcel *parcel, size_t parentHandle, size_t parentOffset); |
| 47 | |
| 48 | // ---------------------- hidl_version |
| 49 | |
| 50 | status_t writeToParcel(const hidl_version &version, android::hardware::Parcel& parcel); |
| 51 | |
| 52 | // Caller is responsible for freeing the returned object. |
| 53 | hidl_version* readFromParcel(const android::hardware::Parcel& parcel); |
| 54 | |
| 55 | // ---------------------- Status |
| 56 | |
| 57 | // Bear in mind that if the client or service is a Java endpoint, this |
| 58 | // is not the logic which will provide/interpret the data here. |
| 59 | status_t readFromParcel(Status *status, const Parcel& parcel); |
| 60 | status_t writeToParcel(const Status &status, Parcel* parcel); |
| 61 | |
| 62 | // ---------------------- hidl_vec |
| 63 | |
| 64 | template<typename T> |
| 65 | status_t readEmbeddedFromParcel( |
| 66 | hidl_vec<T> * /*vec*/, |
| 67 | const Parcel &parcel, |
| 68 | size_t parentHandle, |
| 69 | size_t parentOffset, |
| 70 | size_t *handle) { |
| 71 | const void *ptr = parcel.readEmbeddedBuffer( |
| 72 | handle, |
| 73 | parentHandle, |
| 74 | parentOffset + hidl_vec<T>::kOffsetOfBuffer); |
| 75 | |
| 76 | return ptr != NULL ? OK : UNKNOWN_ERROR; |
| 77 | } |
| 78 | |
| 79 | template<typename T> |
| 80 | status_t writeEmbeddedToParcel( |
| 81 | const hidl_vec<T> &vec, |
| 82 | Parcel *parcel, |
| 83 | size_t parentHandle, |
| 84 | size_t parentOffset, |
| 85 | size_t *handle) { |
| 86 | return parcel->writeEmbeddedBuffer( |
| 87 | vec.data(), |
| 88 | sizeof(T) * vec.size(), |
| 89 | handle, |
| 90 | parentHandle, |
| 91 | parentOffset + hidl_vec<T>::kOffsetOfBuffer); |
| 92 | } |
| 93 | |
| 94 | template<typename T> |
| 95 | status_t findInParcel(const hidl_vec<T> &vec, const Parcel &parcel, size_t *handle) { |
| 96 | return parcel.quickFindBuffer(vec.data(), handle); |
| 97 | } |
| 98 | |
| 99 | // ---------------------- MQDescriptor |
| 100 | |
| 101 | template<MQFlavor flavor> |
| 102 | ::android::status_t readEmbeddedFromParcel( |
| 103 | MQDescriptor<flavor> *obj, |
| 104 | const ::android::hardware::Parcel &parcel, |
| 105 | size_t parentHandle, |
| 106 | size_t parentOffset) { |
| 107 | ::android::status_t _hidl_err = ::android::OK; |
| 108 | |
| 109 | size_t _hidl_grantors_child; |
| 110 | |
| 111 | _hidl_err = ::android::hardware::readEmbeddedFromParcel( |
| 112 | &obj->grantors(), |
| 113 | parcel, |
| 114 | parentHandle, |
| 115 | parentOffset + MQDescriptor<flavor>::kOffsetOfGrantors, |
| 116 | &_hidl_grantors_child); |
| 117 | |
| 118 | if (_hidl_err != ::android::OK) { return _hidl_err; } |
| 119 | |
| 120 | const native_handle_t *_hidl_mq_handle_ptr = parcel.readEmbeddedNativeHandle( |
| 121 | parentHandle, |
| 122 | parentOffset + MQDescriptor<flavor>::kOffsetOfHandle); |
| 123 | |
| 124 | if (_hidl_mq_handle_ptr == nullptr) { |
| 125 | _hidl_err = ::android::UNKNOWN_ERROR; |
| 126 | return _hidl_err; |
| 127 | } |
| 128 | |
| 129 | return _hidl_err; |
| 130 | } |
| 131 | |
| 132 | template<MQFlavor flavor> |
| 133 | ::android::status_t writeEmbeddedToParcel( |
| 134 | const MQDescriptor<flavor> &obj, |
| 135 | ::android::hardware::Parcel *parcel, |
| 136 | size_t parentHandle, |
| 137 | size_t parentOffset) { |
| 138 | ::android::status_t _hidl_err = ::android::OK; |
| 139 | |
| 140 | size_t _hidl_grantors_child; |
| 141 | |
| 142 | _hidl_err = ::android::hardware::writeEmbeddedToParcel( |
| 143 | obj.grantors(), |
| 144 | parcel, |
| 145 | parentHandle, |
| 146 | parentOffset + MQDescriptor<flavor>::kOffsetOfGrantors, |
| 147 | &_hidl_grantors_child); |
| 148 | |
| 149 | if (_hidl_err != ::android::OK) { return _hidl_err; } |
| 150 | |
| 151 | _hidl_err = parcel->writeEmbeddedNativeHandle( |
| 152 | obj.handle(), |
| 153 | parentHandle, |
| 154 | parentOffset + MQDescriptor<flavor>::kOffsetOfHandle); |
| 155 | |
| 156 | if (_hidl_err != ::android::OK) { return _hidl_err; } |
| 157 | |
| 158 | return _hidl_err; |
| 159 | } |
| 160 | |
| 161 | // ---------------------- pointers for HIDL |
| 162 | |
| 163 | template <typename T> |
| 164 | static status_t readEmbeddedReferenceFromParcel( |
| 165 | T const* * /* bufptr */, |
| 166 | const Parcel & parcel, |
| 167 | size_t parentHandle, |
| 168 | size_t parentOffset, |
| 169 | size_t *handle, |
| 170 | bool *shouldResolveRefInBuffer |
| 171 | ) { |
| 172 | // *bufptr is ignored because, if I am embedded in some |
| 173 | // other buffer, the kernel should have fixed me up already. |
| 174 | bool isPreviouslyWritten; |
| 175 | status_t result = parcel.readEmbeddedReference( |
| 176 | nullptr, // ignored, not written to bufptr. |
| 177 | handle, |
| 178 | parentHandle, |
| 179 | parentOffset, |
| 180 | &isPreviouslyWritten); |
| 181 | // tell caller to run T::readEmbeddedToParcel and |
| 182 | // T::readEmbeddedReferenceToParcel if necessary. |
| 183 | // It is not called here because we don't know if these two are valid methods. |
| 184 | *shouldResolveRefInBuffer = !isPreviouslyWritten; |
| 185 | return result; |
| 186 | } |
| 187 | |
| 188 | template <typename T> |
| 189 | static status_t writeEmbeddedReferenceToParcel( |
| 190 | T const* buf, |
| 191 | Parcel *parcel, size_t parentHandle, size_t parentOffset, |
| 192 | size_t *handle, |
| 193 | bool *shouldResolveRefInBuffer |
| 194 | ) { |
| 195 | |
| 196 | if(buf == nullptr) { |
| 197 | *shouldResolveRefInBuffer = false; |
| 198 | return parcel->writeEmbeddedNullReference(handle, parentHandle, parentOffset); |
| 199 | } |
| 200 | |
| 201 | // find whether the buffer exists |
| 202 | size_t childHandle, childOffset; |
| 203 | status_t result; |
| 204 | bool found; |
| 205 | |
| 206 | result = parcel->findBuffer(buf, sizeof(T), &found, &childHandle, &childOffset); |
| 207 | |
| 208 | // tell caller to run T::writeEmbeddedToParcel and |
| 209 | // T::writeEmbeddedReferenceToParcel if necessary. |
| 210 | // It is not called here because we don't know if these two are valid methods. |
| 211 | *shouldResolveRefInBuffer = !found; |
| 212 | |
| 213 | if(result != OK) { |
| 214 | return result; // bad pointers and length given |
| 215 | } |
| 216 | if(!found) { // did not find it. |
| 217 | return parcel->writeEmbeddedBuffer(buf, sizeof(T), handle, |
| 218 | parentHandle, parentOffset); |
| 219 | } |
| 220 | // found the buffer. easy case. |
| 221 | return parcel->writeEmbeddedReference( |
| 222 | handle, |
| 223 | childHandle, |
| 224 | childOffset, |
| 225 | parentHandle, |
| 226 | parentOffset); |
| 227 | } |
| 228 | |
| 229 | template <typename T> |
| 230 | static status_t readReferenceFromParcel( |
| 231 | T const* *bufptr, |
| 232 | const Parcel & parcel, |
| 233 | size_t *handle, |
| 234 | bool *shouldResolveRefInBuffer |
| 235 | ) { |
| 236 | bool isPreviouslyWritten; |
| 237 | status_t result = parcel.readReference(reinterpret_cast<void const* *>(bufptr), |
| 238 | handle, &isPreviouslyWritten); |
| 239 | // tell caller to run T::readEmbeddedToParcel and |
| 240 | // T::readEmbeddedReferenceToParcel if necessary. |
| 241 | // It is not called here because we don't know if these two are valid methods. |
| 242 | *shouldResolveRefInBuffer = !isPreviouslyWritten; |
| 243 | return result; |
| 244 | } |
| 245 | |
| 246 | template <typename T> |
| 247 | static status_t writeReferenceToParcel( |
| 248 | T const *buf, |
| 249 | Parcel * parcel, |
| 250 | size_t *handle, |
| 251 | bool *shouldResolveRefInBuffer |
| 252 | ) { |
| 253 | |
| 254 | if(buf == nullptr) { |
| 255 | *shouldResolveRefInBuffer = false; |
| 256 | return parcel->writeNullReference(handle); |
| 257 | } |
| 258 | |
| 259 | // find whether the buffer exists |
| 260 | size_t childHandle, childOffset; |
| 261 | status_t result; |
| 262 | bool found; |
| 263 | |
| 264 | result = parcel->findBuffer(buf, sizeof(T), &found, &childHandle, &childOffset); |
| 265 | |
| 266 | // tell caller to run T::writeEmbeddedToParcel and |
| 267 | // T::writeEmbeddedReferenceToParcel if necessary. |
| 268 | // It is not called here because we don't know if these two are valid methods. |
| 269 | *shouldResolveRefInBuffer = !found; |
| 270 | |
| 271 | if(result != OK) { |
| 272 | return result; // bad pointers and length given |
| 273 | } |
| 274 | if(!found) { // did not find it. |
| 275 | return parcel->writeBuffer(buf, sizeof(T), handle); |
| 276 | } |
| 277 | // found the buffer. easy case. |
| 278 | return parcel->writeReference(handle, |
| 279 | childHandle, childOffset); |
| 280 | } |
| 281 | |
| 282 | // ---------------------- support for casting interfaces |
| 283 | |
Yifan Hong | 7f97f44 | 2016-11-14 18:31:05 -0800 | [diff] [blame] | 284 | // Construct a smallest possible binder from the given interface. |
| 285 | // If it is remote, then its remote() will be retrieved. |
| 286 | // Otherwise, the smallest possible BnChild is found where IChild is a subclass of IType |
| 287 | // and iface is of class IChild. BnChild will be used to wrapped the given iface. |
| 288 | // Return nullptr if iface is null or any failure. |
| 289 | template <typename IType, typename IHwType> |
| 290 | sp<IBinder> toBinder(sp<IType> iface) { |
| 291 | IType *ifacePtr = iface.get(); |
| 292 | if (ifacePtr == nullptr) { |
| 293 | return nullptr; |
| 294 | } |
| 295 | if (ifacePtr->isRemote()) { |
| 296 | return ::android::hardware::IInterface::asBinder(static_cast<IHwType *>(ifacePtr)); |
| 297 | } else { |
| 298 | std::string myDescriptor{}; |
| 299 | ifacePtr->interfaceChain([&](const hidl_vec<hidl_string> &types) { |
| 300 | if (types.size() > 0) { |
| 301 | myDescriptor = types[0].c_str(); |
| 302 | } |
| 303 | }); |
| 304 | if (myDescriptor.empty()) { |
Yifan Hong | b2c9c75 | 2016-12-07 15:15:41 -0800 | [diff] [blame] | 305 | // interfaceChain fails |
Yifan Hong | 7f97f44 | 2016-11-14 18:31:05 -0800 | [diff] [blame] | 306 | return nullptr; |
| 307 | } |
| 308 | auto iter = gBnConstructorMap.find(myDescriptor); |
| 309 | if (iter == gBnConstructorMap.end()) { |
| 310 | return nullptr; |
| 311 | } |
| 312 | return sp<IBinder>((iter->second)(reinterpret_cast<void *>(ifacePtr))); |
| 313 | } |
| 314 | } |
| 315 | |
| 316 | #define IMPLEMENT_SERVICE_MANAGER_INTERACTIONS(INTERFACE, PACKAGE) \ |
| 317 | ::android::sp<I##INTERFACE> I##INTERFACE::getService( \ |
| 318 | const std::string &serviceName, bool getStub) \ |
| 319 | { \ |
| 320 | using ::android::sp; \ |
| 321 | using ::android::hardware::defaultServiceManager; \ |
Yifan Hong | 7f97f44 | 2016-11-14 18:31:05 -0800 | [diff] [blame] | 322 | using ::android::hidl::manager::V1_0::IServiceManager; \ |
| 323 | sp<I##INTERFACE> iface; \ |
| 324 | const sp<IServiceManager> sm = defaultServiceManager(); \ |
| 325 | if (sm != nullptr && !getStub) { \ |
Yifan Hong | 2cd440c | 2016-11-23 11:30:36 -0800 | [diff] [blame] | 326 | sp<::android::hidl::base::V1_0::IBase> base; \ |
Yifan Hong | 7f97f44 | 2016-11-14 18:31:05 -0800 | [diff] [blame] | 327 | ::android::hardware::Return<void> ret = \ |
| 328 | sm->get(PACKAGE "::I" #INTERFACE, serviceName.c_str(), \ |
Yifan Hong | 2cd440c | 2016-11-23 11:30:36 -0800 | [diff] [blame] | 329 | [&base](sp<::android::hidl::base::V1_0::IBase> found) { \ |
| 330 | base = found; \ |
Yifan Hong | 7f97f44 | 2016-11-14 18:31:05 -0800 | [diff] [blame] | 331 | }); \ |
| 332 | if (ret.getStatus().isOk()) { \ |
Yifan Hong | 2cd440c | 2016-11-23 11:30:36 -0800 | [diff] [blame] | 333 | iface = I##INTERFACE::castFrom(base); \ |
Yifan Hong | 7f97f44 | 2016-11-14 18:31:05 -0800 | [diff] [blame] | 334 | if (iface != nullptr) { \ |
| 335 | return iface; \ |
| 336 | } \ |
| 337 | } \ |
| 338 | } \ |
| 339 | int dlMode = RTLD_LAZY; \ |
| 340 | void *handle = dlopen(HAL_LIBRARY_PATH_ODM PACKAGE "-impl.so", dlMode); \ |
| 341 | if (handle == nullptr) { \ |
| 342 | handle = dlopen(HAL_LIBRARY_PATH_VENDOR PACKAGE "-impl.so", dlMode); \ |
| 343 | } \ |
| 344 | if (handle == nullptr) { \ |
| 345 | handle = dlopen(HAL_LIBRARY_PATH_SYSTEM PACKAGE "-impl.so", dlMode); \ |
| 346 | } \ |
| 347 | if (handle == nullptr) { \ |
| 348 | return iface; \ |
| 349 | } \ |
| 350 | I##INTERFACE* (*generator)(const char* name); \ |
| 351 | *(void **)(&generator) = dlsym(handle, "HIDL_FETCH_I"#INTERFACE); \ |
| 352 | if (generator) { \ |
| 353 | iface = (*generator)(serviceName.c_str()); \ |
| 354 | if (iface != nullptr) { \ |
| 355 | iface = new Bs##INTERFACE(iface); \ |
| 356 | } \ |
| 357 | } \ |
| 358 | return iface; \ |
| 359 | } \ |
| 360 | ::android::status_t I##INTERFACE::registerAsService( \ |
| 361 | const std::string &serviceName) \ |
| 362 | { \ |
| 363 | using ::android::sp; \ |
| 364 | using ::android::hardware::defaultServiceManager; \ |
| 365 | using ::android::hidl::manager::V1_0::IServiceManager; \ |
| 366 | sp<Bn##INTERFACE> binderIface = new Bn##INTERFACE(this); \ |
| 367 | const sp<IServiceManager> sm = defaultServiceManager(); \ |
| 368 | bool success = false; \ |
| 369 | ::android::hardware::Return<void> ret = \ |
| 370 | this->interfaceChain( \ |
| 371 | [&success, &sm, &serviceName, &binderIface](const auto &chain) { \ |
Steven Moreland | 337c3ae | 2016-11-22 13:37:32 -0800 | [diff] [blame] | 372 | ::android::hardware::Return<bool> addRet = \ |
| 373 | sm->add(chain, serviceName.c_str(), binderIface); \ |
Steven Moreland | 1cfaee7 | 2016-12-01 08:34:19 -0800 | [diff] [blame] | 374 | success = addRet.isOk() && addRet; \ |
Yifan Hong | 7f97f44 | 2016-11-14 18:31:05 -0800 | [diff] [blame] | 375 | }); \ |
| 376 | success = success && ret.getStatus().isOk(); \ |
| 377 | return success ? ::android::OK : ::android::UNKNOWN_ERROR; \ |
| 378 | } \ |
| 379 | bool I##INTERFACE::registerForNotifications( \ |
| 380 | const std::string &serviceName, \ |
| 381 | const ::android::sp<::android::hidl::manager::V1_0::IServiceNotification> \ |
| 382 | ¬ification) \ |
| 383 | { \ |
| 384 | using ::android::sp; \ |
| 385 | using ::android::hardware::defaultServiceManager; \ |
| 386 | using ::android::hidl::manager::V1_0::IServiceManager; \ |
| 387 | const sp<IServiceManager> sm = defaultServiceManager(); \ |
| 388 | if (sm == nullptr) { \ |
| 389 | return false; \ |
| 390 | } \ |
Steven Moreland | 337c3ae | 2016-11-22 13:37:32 -0800 | [diff] [blame] | 391 | ::android::hardware::Return<bool> success = \ |
| 392 | sm->registerForNotifications(PACKAGE "::I" #INTERFACE, \ |
| 393 | serviceName, \ |
| 394 | notification); \ |
Steven Moreland | 1cfaee7 | 2016-12-01 08:34:19 -0800 | [diff] [blame] | 395 | return success.isOk() && success; \ |
Yifan Hong | 7f97f44 | 2016-11-14 18:31:05 -0800 | [diff] [blame] | 396 | } |
| 397 | |
| 398 | |
| 399 | } // namespace hardware |
| 400 | } // namespace android |
| 401 | |
| 402 | |
| 403 | #endif // ANDROID_HIDL_BINDER_SUPPORT_H |