HidlBinderSupport.cpp revision 3079100878a2595be644d866e67c12a9de620fd5
17f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong/* 27f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong * Copyright (C) 2016 The Android Open Source Project 37f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong * 47f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong * Licensed under the Apache License, Version 2.0 (the "License"); 57f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong * you may not use this file except in compliance with the License. 67f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong * You may obtain a copy of the License at 77f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong * 87f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong * http://www.apache.org/licenses/LICENSE-2.0 97f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong * 107f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong * Unless required by applicable law or agreed to in writing, software 117f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong * distributed under the License is distributed on an "AS IS" BASIS, 127f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 137f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong * See the License for the specific language governing permissions and 147f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong * limitations under the License. 157f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong */ 167f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 177f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong#define LOG_TAG "HidlSupport" 187f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 197f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong#include <hidl/HidlBinderSupport.h> 207f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 217f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong#ifdef LIBHIDL_TARGET_DEBUGGABLE 227f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong#include <android-base/logging.h> 237f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong#endif 247f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 257f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hongnamespace android { 267f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hongnamespace hardware { 277f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 287f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hongstd::map<std::string, std::function<sp<IBinder>(void*)>> gBnConstructorMap{}; 297f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 303079100878a2595be644d866e67c12a9de620fd5Martijn Coenenconst size_t hidl_memory::kOffsetOfHandle = offsetof(hidl_memory, mHandle); 313079100878a2595be644d866e67c12a9de620fd5Martijn Coenenconst size_t hidl_memory::kOffsetOfName = offsetof(hidl_memory, mName); 323079100878a2595be644d866e67c12a9de620fd5Martijn Coenen 333079100878a2595be644d866e67c12a9de620fd5Martijn Coenenstatus_t readEmbeddedFromParcel(hidl_memory * /* memory */, 343079100878a2595be644d866e67c12a9de620fd5Martijn Coenen const Parcel &parcel, size_t parentHandle, size_t parentOffset) { 353079100878a2595be644d866e67c12a9de620fd5Martijn Coenen ::android::status_t _hidl_err = ::android::OK; 363079100878a2595be644d866e67c12a9de620fd5Martijn Coenen const native_handle_t *_hidl_memory_handle = parcel.readEmbeddedNativeHandle( 373079100878a2595be644d866e67c12a9de620fd5Martijn Coenen parentHandle, 383079100878a2595be644d866e67c12a9de620fd5Martijn Coenen parentOffset + hidl_memory::kOffsetOfHandle); 393079100878a2595be644d866e67c12a9de620fd5Martijn Coenen 403079100878a2595be644d866e67c12a9de620fd5Martijn Coenen if (_hidl_memory_handle == nullptr) { 413079100878a2595be644d866e67c12a9de620fd5Martijn Coenen _hidl_err = ::android::UNKNOWN_ERROR; 423079100878a2595be644d866e67c12a9de620fd5Martijn Coenen return _hidl_err; 433079100878a2595be644d866e67c12a9de620fd5Martijn Coenen } 443079100878a2595be644d866e67c12a9de620fd5Martijn Coenen 453079100878a2595be644d866e67c12a9de620fd5Martijn Coenen _hidl_err = readEmbeddedFromParcel( 463079100878a2595be644d866e67c12a9de620fd5Martijn Coenen (hidl_string*) nullptr, 473079100878a2595be644d866e67c12a9de620fd5Martijn Coenen parcel, 483079100878a2595be644d866e67c12a9de620fd5Martijn Coenen parentHandle, 493079100878a2595be644d866e67c12a9de620fd5Martijn Coenen parentOffset + hidl_memory::kOffsetOfName); 503079100878a2595be644d866e67c12a9de620fd5Martijn Coenen 513079100878a2595be644d866e67c12a9de620fd5Martijn Coenen return _hidl_err; 523079100878a2595be644d866e67c12a9de620fd5Martijn Coenen} 533079100878a2595be644d866e67c12a9de620fd5Martijn Coenen 543079100878a2595be644d866e67c12a9de620fd5Martijn Coenenstatus_t writeEmbeddedToParcel(const hidl_memory &memory, 553079100878a2595be644d866e67c12a9de620fd5Martijn Coenen Parcel *parcel, size_t parentHandle, size_t parentOffset) { 563079100878a2595be644d866e67c12a9de620fd5Martijn Coenen status_t _hidl_err = parcel->writeEmbeddedNativeHandle( 573079100878a2595be644d866e67c12a9de620fd5Martijn Coenen memory.handle(), 583079100878a2595be644d866e67c12a9de620fd5Martijn Coenen parentHandle, 593079100878a2595be644d866e67c12a9de620fd5Martijn Coenen parentOffset + hidl_memory::kOffsetOfHandle); 603079100878a2595be644d866e67c12a9de620fd5Martijn Coenen 613079100878a2595be644d866e67c12a9de620fd5Martijn Coenen if (_hidl_err == ::android::OK) { 623079100878a2595be644d866e67c12a9de620fd5Martijn Coenen _hidl_err = writeEmbeddedToParcel( 633079100878a2595be644d866e67c12a9de620fd5Martijn Coenen memory.name(), 643079100878a2595be644d866e67c12a9de620fd5Martijn Coenen parcel, 653079100878a2595be644d866e67c12a9de620fd5Martijn Coenen parentHandle, 663079100878a2595be644d866e67c12a9de620fd5Martijn Coenen parentOffset + hidl_memory::kOffsetOfName); 673079100878a2595be644d866e67c12a9de620fd5Martijn Coenen } 683079100878a2595be644d866e67c12a9de620fd5Martijn Coenen 693079100878a2595be644d866e67c12a9de620fd5Martijn Coenen return _hidl_err; 703079100878a2595be644d866e67c12a9de620fd5Martijn Coenen} 717f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong// static 727f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hongconst size_t hidl_string::kOffsetOfBuffer = offsetof(hidl_string, mBuffer); 737f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 747f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hongstatus_t readEmbeddedFromParcel(hidl_string * /* string */, 757f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong const Parcel &parcel, size_t parentHandle, size_t parentOffset) { 767f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong const void *ptr = parcel.readEmbeddedBuffer( 777f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong nullptr /* buffer_handle */, 787f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong parentHandle, 797f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong parentOffset + hidl_string::kOffsetOfBuffer); 807f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 817f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong return ptr != NULL ? OK : UNKNOWN_ERROR; 827f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong} 837f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 847f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hongstatus_t writeEmbeddedToParcel(const hidl_string &string, 857f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong Parcel *parcel, size_t parentHandle, size_t parentOffset) { 867f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong return parcel->writeEmbeddedBuffer( 877f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong string.c_str(), 887f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong string.size() + 1, 897f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong nullptr /* handle */, 907f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong parentHandle, 917f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong parentOffset + hidl_string::kOffsetOfBuffer); 927f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong} 937f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 947f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hongandroid::status_t writeToParcel(const hidl_version &version, android::hardware::Parcel& parcel) { 957f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong return parcel.writeUint32(static_cast<uint32_t>(version.get_major()) << 16 | version.get_minor()); 967f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong} 977f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 987f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Honghidl_version* readFromParcel(const android::hardware::Parcel& parcel) { 997f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong uint32_t version; 1007f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong android::status_t status = parcel.readUint32(&version); 1017f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong if (status != OK) { 1027f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong return nullptr; 1037f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong } else { 1047f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong return new hidl_version(version >> 16, version & 0xFFFF); 1057f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong } 1067f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong} 1077f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 1087f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hongstatus_t readFromParcel(Status *s, const Parcel& parcel) { 1097f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong int32_t exception; 1107f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong int32_t errorCode; 1117f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong status_t status = parcel.readInt32(&exception); 1127f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong if (status != OK) { 1137f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong s->setFromStatusT(status); 1147f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong return status; 1157f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong } 1167f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 1177f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong // Skip over fat response headers. Not used (or propagated) in native code. 1187f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong if (exception == Status::EX_HAS_REPLY_HEADER) { 1197f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong // Note that the header size includes the 4 byte size field. 1207f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong const int32_t header_start = parcel.dataPosition(); 1217f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong int32_t header_size; 1227f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong status = parcel.readInt32(&header_size); 1237f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong if (status != OK) { 1247f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong s->setFromStatusT(status); 1257f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong return status; 1267f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong } 1277f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong parcel.setDataPosition(header_start + header_size); 1287f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong // And fat response headers are currently only used when there are no 1297f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong // exceptions, so act like there was no error. 1307f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong exception = Status::EX_NONE; 1317f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong } 1327f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 1337f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong if (exception == Status::EX_NONE) { 1347f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong *s = Status::ok(); 1357f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong return status; 1367f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong } 1377f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 1387f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong // The remote threw an exception. Get the message back. 1397f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong String16 message; 1407f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong status = parcel.readString16(&message); 1417f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong if (status != OK) { 1427f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong s->setFromStatusT(status); 1437f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong return status; 1447f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong } 1457f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 1467f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong if (exception == Status::EX_SERVICE_SPECIFIC) { 1477f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong status = parcel.readInt32(&errorCode); 1487f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong } 1497f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong if (status != OK) { 1507f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong s->setFromStatusT(status); 1517f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong return status; 1527f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong } 1537f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 1547f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong if (exception == Status::EX_SERVICE_SPECIFIC) { 1557f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong s->setServiceSpecificError(errorCode, String8(message)); 1567f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong } else { 1577f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong s->setException(exception, String8(message)); 1587f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong } 1597f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 1607f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong return status; 1617f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong} 1627f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 1637f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hongstatus_t writeToParcel(const Status &s, Parcel* parcel) { 1647f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong // Something really bad has happened, and we're not going to even 1657f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong // try returning rich error data. 1667f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong if (s.exceptionCode() == Status::EX_TRANSACTION_FAILED) { 1677f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong return s.transactionError(); 1687f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong } 1697f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 1707f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong status_t status = parcel->writeInt32(s.exceptionCode()); 1717f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong if (status != OK) { return status; } 1727f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong if (s.exceptionCode() == Status::EX_NONE) { 1737f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong // We have no more information to write. 1747f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong return status; 1757f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong } 1767f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong status = parcel->writeString16(String16(s.exceptionMessage())); 1777f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong if (s.exceptionCode() != Status::EX_SERVICE_SPECIFIC) { 1787f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong // We have no more information to write. 1797f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong return status; 1807f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong } 1817f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong status = parcel->writeInt32(s.serviceSpecificErrorCode()); 1827f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong return status; 1837f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong} 1847f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 1857f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong} // namespace hardware 1867f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong} // namespace android 187