Steven Moreland | 2e87adc | 2018-08-20 19:47:00 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2018 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 | #include <android/binder_ibinder.h> |
| 18 | #include "AIBinder_internal.h" |
| 19 | |
| 20 | #include <android/binder_status.h> |
| 21 | #include "AParcel_internal.h" |
| 22 | |
| 23 | #include <android-base/logging.h> |
| 24 | |
| 25 | using ::android::IBinder; |
| 26 | using ::android::Parcel; |
| 27 | using ::android::sp; |
| 28 | using ::android::String16; |
| 29 | using ::android::wp; |
| 30 | |
Steven Moreland | 71cddc3 | 2018-08-30 23:39:22 -0700 | [diff] [blame] | 31 | namespace ABBinderTag { |
| 32 | |
| 33 | static const void* kId = "ABBinder"; |
| 34 | static void* kValue = static_cast<void*>(new bool{true}); |
| 35 | void cleanId(const void* /*id*/, void* /*obj*/, void* /*cookie*/){/* do nothing */}; |
| 36 | |
| 37 | static void attach(const sp<IBinder>& binder) { |
| 38 | binder->attachObject(kId, kValue, nullptr /*cookie*/, cleanId); |
| 39 | } |
| 40 | static bool has(const sp<IBinder>& binder) { |
| 41 | return binder != nullptr && binder->findObject(kId) == kValue; |
| 42 | } |
| 43 | |
| 44 | } // namespace ABBinderTag |
| 45 | |
Steven Moreland | 2e87adc | 2018-08-20 19:47:00 -0700 | [diff] [blame] | 46 | AIBinder::AIBinder(const AIBinder_Class* clazz) : mClazz(clazz) {} |
| 47 | AIBinder::~AIBinder() {} |
| 48 | |
Steven Moreland | 71cddc3 | 2018-08-30 23:39:22 -0700 | [diff] [blame] | 49 | bool AIBinder::associateClass(const AIBinder_Class* clazz) { |
Steven Moreland | 2e87adc | 2018-08-20 19:47:00 -0700 | [diff] [blame] | 50 | using ::android::String8; |
| 51 | |
Steven Moreland | 71cddc3 | 2018-08-30 23:39:22 -0700 | [diff] [blame] | 52 | if (clazz == nullptr) return false; |
| 53 | if (mClazz == clazz) return true; |
Steven Moreland | 2e87adc | 2018-08-20 19:47:00 -0700 | [diff] [blame] | 54 | |
| 55 | String8 newDescriptor(clazz->getInterfaceDescriptor()); |
| 56 | |
| 57 | if (mClazz != nullptr) { |
| 58 | String8 currentDescriptor(mClazz->getInterfaceDescriptor()); |
| 59 | if (newDescriptor == currentDescriptor) { |
| 60 | LOG(ERROR) << __func__ << ": Class descriptors '" << currentDescriptor |
| 61 | << "' match during associateClass, but they are different class objects. " |
| 62 | "Class descriptor collision?"; |
Steven Moreland | 71cddc3 | 2018-08-30 23:39:22 -0700 | [diff] [blame] | 63 | } else { |
| 64 | LOG(ERROR) << __func__ |
| 65 | << ": Class cannot be associated on object which already has a class. " |
| 66 | "Trying to associate to '" |
| 67 | << newDescriptor.c_str() << "' but already set to '" |
| 68 | << currentDescriptor.c_str() << "'."; |
Steven Moreland | 2e87adc | 2018-08-20 19:47:00 -0700 | [diff] [blame] | 69 | } |
| 70 | |
Steven Moreland | 71cddc3 | 2018-08-30 23:39:22 -0700 | [diff] [blame] | 71 | // always a failure because we know mClazz != clazz |
| 72 | return false; |
Steven Moreland | 2e87adc | 2018-08-20 19:47:00 -0700 | [diff] [blame] | 73 | } |
| 74 | |
Steven Moreland | 71cddc3 | 2018-08-30 23:39:22 -0700 | [diff] [blame] | 75 | CHECK(asABpBinder() != nullptr); // ABBinder always has a descriptor |
| 76 | |
Steven Moreland | 2e87adc | 2018-08-20 19:47:00 -0700 | [diff] [blame] | 77 | String8 descriptor(getBinder()->getInterfaceDescriptor()); |
| 78 | if (descriptor != newDescriptor) { |
| 79 | LOG(ERROR) << __func__ << ": Expecting binder to have class '" << newDescriptor.c_str() |
| 80 | << "' but descriptor is actually '" << descriptor.c_str() << "'."; |
Steven Moreland | 71cddc3 | 2018-08-30 23:39:22 -0700 | [diff] [blame] | 81 | return false; |
Steven Moreland | 2e87adc | 2018-08-20 19:47:00 -0700 | [diff] [blame] | 82 | } |
| 83 | |
Steven Moreland | 71cddc3 | 2018-08-30 23:39:22 -0700 | [diff] [blame] | 84 | // if this is a local object, it's not one known to libbinder_ndk |
Steven Moreland | 2e87adc | 2018-08-20 19:47:00 -0700 | [diff] [blame] | 85 | mClazz = clazz; |
| 86 | |
Steven Moreland | 71cddc3 | 2018-08-30 23:39:22 -0700 | [diff] [blame] | 87 | return true; |
Steven Moreland | 2e87adc | 2018-08-20 19:47:00 -0700 | [diff] [blame] | 88 | } |
| 89 | |
| 90 | ABBinder::ABBinder(const AIBinder_Class* clazz, void* userData) |
| 91 | : AIBinder(clazz), BBinder(), mUserData(userData) { |
| 92 | CHECK(clazz != nullptr); |
| 93 | } |
| 94 | ABBinder::~ABBinder() { |
| 95 | getClass()->onDestroy(mUserData); |
| 96 | } |
| 97 | |
| 98 | const String16& ABBinder::getInterfaceDescriptor() const { |
| 99 | return getClass()->getInterfaceDescriptor(); |
| 100 | } |
| 101 | |
| 102 | binder_status_t ABBinder::onTransact(transaction_code_t code, const Parcel& data, Parcel* reply, |
| 103 | binder_flags_t flags) { |
| 104 | if (isUserCommand(code)) { |
| 105 | if (!data.checkInterface(this)) { |
| 106 | return EX_ILLEGAL_STATE; |
| 107 | } |
| 108 | |
| 109 | const AParcel in = AParcel::readOnly(this, &data); |
| 110 | AParcel out = AParcel(this, reply, false /*owns*/); |
| 111 | |
| 112 | return getClass()->onTransact(this, code, &in, &out); |
| 113 | } else { |
| 114 | return BBinder::onTransact(code, data, reply, flags); |
| 115 | } |
| 116 | } |
| 117 | |
Steven Moreland | 71cddc3 | 2018-08-30 23:39:22 -0700 | [diff] [blame] | 118 | ABpBinder::ABpBinder(const ::android::sp<::android::IBinder>& binder) |
Steven Moreland | 2e87adc | 2018-08-20 19:47:00 -0700 | [diff] [blame] | 119 | : AIBinder(nullptr /*clazz*/), BpRefBase(binder) { |
| 120 | CHECK(binder != nullptr); |
| 121 | } |
| 122 | ABpBinder::~ABpBinder() {} |
| 123 | |
Steven Moreland | 71cddc3 | 2018-08-30 23:39:22 -0700 | [diff] [blame] | 124 | sp<AIBinder> ABpBinder::fromBinder(const ::android::sp<::android::IBinder>& binder) { |
| 125 | if (binder == nullptr) { |
| 126 | return nullptr; |
| 127 | } |
| 128 | if (ABBinderTag::has(binder)) { |
| 129 | return static_cast<ABBinder*>(binder.get()); |
| 130 | } |
| 131 | return new ABpBinder(binder); |
| 132 | } |
| 133 | |
Steven Moreland | 2e87adc | 2018-08-20 19:47:00 -0700 | [diff] [blame] | 134 | struct AIBinder_Weak { |
| 135 | wp<AIBinder> binder; |
| 136 | }; |
| 137 | AIBinder_Weak* AIBinder_Weak_new(AIBinder* binder) { |
Steven Moreland | 5ccb70f | 2018-09-04 16:30:21 -0700 | [diff] [blame^] | 138 | if (binder == nullptr) { |
| 139 | return nullptr; |
| 140 | } |
| 141 | |
Steven Moreland | 2e87adc | 2018-08-20 19:47:00 -0700 | [diff] [blame] | 142 | return new AIBinder_Weak{wp<AIBinder>(binder)}; |
| 143 | } |
Steven Moreland | 5ccb70f | 2018-09-04 16:30:21 -0700 | [diff] [blame^] | 144 | void AIBinder_Weak_delete(AIBinder_Weak** weakBinder) { |
| 145 | if (weakBinder == nullptr) { |
| 146 | return; |
| 147 | } |
| 148 | |
| 149 | delete *weakBinder; |
| 150 | *weakBinder = nullptr; |
Steven Moreland | 2e87adc | 2018-08-20 19:47:00 -0700 | [diff] [blame] | 151 | } |
| 152 | AIBinder* AIBinder_Weak_promote(AIBinder_Weak* weakBinder) { |
Steven Moreland | 5ccb70f | 2018-09-04 16:30:21 -0700 | [diff] [blame^] | 153 | if (weakBinder == nullptr) { |
| 154 | return nullptr; |
| 155 | } |
| 156 | |
Steven Moreland | 2e87adc | 2018-08-20 19:47:00 -0700 | [diff] [blame] | 157 | sp<AIBinder> binder = weakBinder->binder.promote(); |
| 158 | AIBinder_incStrong(binder.get()); |
| 159 | return binder.get(); |
| 160 | } |
| 161 | |
| 162 | AIBinder_Class::AIBinder_Class(const char* interfaceDescriptor, AIBinder_Class_onCreate onCreate, |
| 163 | AIBinder_Class_onDestroy onDestroy, |
| 164 | AIBinder_Class_onTransact onTransact) |
| 165 | : onCreate(onCreate), |
| 166 | onDestroy(onDestroy), |
| 167 | onTransact(onTransact), |
| 168 | mInterfaceDescriptor(interfaceDescriptor) {} |
| 169 | |
| 170 | AIBinder_Class* AIBinder_Class_define(const char* interfaceDescriptor, |
| 171 | AIBinder_Class_onCreate onCreate, |
| 172 | AIBinder_Class_onDestroy onDestroy, |
| 173 | AIBinder_Class_onTransact onTransact) { |
| 174 | if (interfaceDescriptor == nullptr || onCreate == nullptr || onDestroy == nullptr || |
| 175 | onTransact == nullptr) { |
| 176 | return nullptr; |
| 177 | } |
| 178 | |
| 179 | return new AIBinder_Class(interfaceDescriptor, onCreate, onDestroy, onTransact); |
| 180 | } |
| 181 | |
| 182 | AIBinder* AIBinder_new(const AIBinder_Class* clazz, void* args) { |
| 183 | if (clazz == nullptr) { |
| 184 | LOG(ERROR) << __func__ << ": Must provide class to construct local binder."; |
| 185 | return nullptr; |
| 186 | } |
| 187 | |
| 188 | void* userData = clazz->onCreate(args); |
| 189 | |
Steven Moreland | 71cddc3 | 2018-08-30 23:39:22 -0700 | [diff] [blame] | 190 | sp<AIBinder> ret = new ABBinder(clazz, userData); |
| 191 | ABBinderTag::attach(ret->getBinder()); |
| 192 | |
| 193 | AIBinder_incStrong(ret.get()); |
| 194 | return ret.get(); |
Steven Moreland | 2e87adc | 2018-08-20 19:47:00 -0700 | [diff] [blame] | 195 | } |
| 196 | |
Steven Moreland | 5ea54da | 2018-09-04 13:29:55 -0700 | [diff] [blame] | 197 | bool AIBinder_isRemote(const AIBinder* binder) { |
Steven Moreland | 2e87adc | 2018-08-20 19:47:00 -0700 | [diff] [blame] | 198 | if (binder == nullptr) { |
| 199 | return true; |
| 200 | } |
| 201 | |
| 202 | return binder->isRemote(); |
| 203 | } |
| 204 | |
| 205 | void AIBinder_incStrong(AIBinder* binder) { |
| 206 | if (binder == nullptr) { |
| 207 | LOG(ERROR) << __func__ << ": on null binder"; |
| 208 | return; |
| 209 | } |
| 210 | |
| 211 | binder->incStrong(nullptr); |
| 212 | } |
| 213 | void AIBinder_decStrong(AIBinder* binder) { |
| 214 | if (binder == nullptr) { |
| 215 | LOG(ERROR) << __func__ << ": on null binder"; |
| 216 | return; |
| 217 | } |
| 218 | |
| 219 | binder->decStrong(nullptr); |
| 220 | } |
| 221 | int32_t AIBinder_debugGetRefCount(AIBinder* binder) { |
| 222 | if (binder == nullptr) { |
| 223 | LOG(ERROR) << __func__ << ": on null binder"; |
| 224 | return -1; |
| 225 | } |
| 226 | |
| 227 | return binder->getStrongCount(); |
| 228 | } |
| 229 | |
Steven Moreland | 71cddc3 | 2018-08-30 23:39:22 -0700 | [diff] [blame] | 230 | bool AIBinder_associateClass(AIBinder* binder, const AIBinder_Class* clazz) { |
| 231 | if (binder == nullptr) { |
| 232 | return false; |
Steven Moreland | 2e87adc | 2018-08-20 19:47:00 -0700 | [diff] [blame] | 233 | } |
| 234 | |
Steven Moreland | 71cddc3 | 2018-08-30 23:39:22 -0700 | [diff] [blame] | 235 | return binder->associateClass(clazz); |
Steven Moreland | 2e87adc | 2018-08-20 19:47:00 -0700 | [diff] [blame] | 236 | } |
| 237 | |
| 238 | const AIBinder_Class* AIBinder_getClass(AIBinder* binder) { |
| 239 | if (binder == nullptr) { |
| 240 | return nullptr; |
| 241 | } |
| 242 | |
| 243 | return binder->getClass(); |
| 244 | } |
| 245 | |
| 246 | void* AIBinder_getUserData(AIBinder* binder) { |
| 247 | if (binder == nullptr) { |
| 248 | return nullptr; |
| 249 | } |
| 250 | |
| 251 | ABBinder* bBinder = binder->asABBinder(); |
| 252 | if (bBinder == nullptr) { |
| 253 | return nullptr; |
| 254 | } |
| 255 | |
| 256 | return bBinder->getUserData(); |
| 257 | } |
| 258 | |
| 259 | binder_status_t AIBinder_prepareTransaction(AIBinder* binder, AParcel** in) { |
| 260 | if (binder == nullptr || in == nullptr) { |
| 261 | LOG(ERROR) << __func__ << ": requires non-null parameters."; |
| 262 | return EX_NULL_POINTER; |
| 263 | } |
| 264 | const AIBinder_Class* clazz = binder->getClass(); |
| 265 | if (clazz == nullptr) { |
| 266 | LOG(ERROR) << __func__ |
| 267 | << ": Class must be defined for a remote binder transaction. See " |
| 268 | "AIBinder_associateClass."; |
| 269 | return EX_ILLEGAL_STATE; |
| 270 | } |
| 271 | |
| 272 | *in = new AParcel(binder); |
| 273 | binder_status_t status = (**in)->writeInterfaceToken(clazz->getInterfaceDescriptor()); |
| 274 | if (status != EX_NONE) { |
| 275 | delete *in; |
| 276 | *in = nullptr; |
| 277 | } |
| 278 | |
| 279 | return status; |
| 280 | } |
| 281 | |
| 282 | using AutoParcelDestroyer = std::unique_ptr<AParcel*, void (*)(AParcel**)>; |
| 283 | static void destroy_parcel(AParcel** parcel) { |
| 284 | delete *parcel; |
| 285 | *parcel = nullptr; |
| 286 | } |
| 287 | |
| 288 | binder_status_t AIBinder_transact(AIBinder* binder, transaction_code_t code, AParcel** in, |
| 289 | AParcel** out, binder_flags_t flags) { |
| 290 | if (in == nullptr) { |
| 291 | LOG(ERROR) << __func__ << ": requires non-null in parameter"; |
| 292 | return EX_NULL_POINTER; |
| 293 | } |
| 294 | |
| 295 | // This object is the input to the transaction. This function takes ownership of it and deletes |
| 296 | // it. |
| 297 | AutoParcelDestroyer forIn(in, destroy_parcel); |
| 298 | |
| 299 | if (!isUserCommand(code)) { |
| 300 | LOG(ERROR) << __func__ << ": Only user-defined transactions can be made from the NDK."; |
| 301 | return EX_UNSUPPORTED_OPERATION; |
| 302 | } |
| 303 | |
| 304 | if ((flags & ~FLAG_ONEWAY) != 0) { |
| 305 | LOG(ERROR) << __func__ << ": Unrecognized flags sent: " << flags; |
| 306 | return EX_ILLEGAL_ARGUMENT; |
| 307 | } |
| 308 | |
| 309 | if (binder == nullptr || *in == nullptr || out == nullptr) { |
| 310 | LOG(ERROR) << __func__ << ": requires non-null parameters."; |
| 311 | return EX_NULL_POINTER; |
| 312 | } |
| 313 | |
| 314 | if ((*in)->getBinder() != binder) { |
| 315 | LOG(ERROR) << __func__ << ": parcel is associated with binder object " << binder |
| 316 | << " but called with " << (*in)->getBinder(); |
| 317 | return EX_ILLEGAL_STATE; |
| 318 | } |
| 319 | |
| 320 | *out = new AParcel(binder); |
| 321 | |
| 322 | binder_status_t parcelStatus = |
| 323 | binder->getBinder()->transact(code, *(*in)->operator->(), (*out)->operator->(), flags); |
| 324 | |
| 325 | if (parcelStatus != EX_NONE) { |
| 326 | delete *out; |
| 327 | *out = nullptr; |
| 328 | } |
| 329 | |
| 330 | return parcelStatus; |
| 331 | } |
| 332 | |
| 333 | binder_status_t AIBinder_finalizeTransaction(AIBinder* binder, AParcel** out) { |
| 334 | if (out == nullptr) { |
| 335 | LOG(ERROR) << __func__ << ": requires non-null out parameter"; |
| 336 | return EX_NULL_POINTER; |
| 337 | } |
| 338 | |
| 339 | // This object is the input to the transaction. This function takes ownership of it and deletes |
| 340 | // it. |
| 341 | AutoParcelDestroyer forOut(out, destroy_parcel); |
| 342 | |
| 343 | if (binder == nullptr || *out == nullptr) { |
| 344 | LOG(ERROR) << __func__ << ": requires non-null parameters."; |
| 345 | return EX_NULL_POINTER; |
| 346 | } |
| 347 | |
| 348 | if ((*out)->getBinder() != binder) { |
| 349 | LOG(ERROR) << __func__ << ": parcel is associated with binder object " << binder |
| 350 | << " but called with " << (*out)->getBinder(); |
| 351 | return EX_ILLEGAL_STATE; |
| 352 | } |
| 353 | |
| 354 | if ((**out)->dataAvail() != 0) { |
| 355 | LOG(ERROR) << __func__ |
| 356 | << ": Only part of this transaction was read. There is remaining data left."; |
| 357 | return EX_ILLEGAL_STATE; |
| 358 | } |
| 359 | |
| 360 | return EX_NONE; |
| 361 | } |