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Diffstat (limited to 'libs/binder/IServiceManager.cpp')
| -rw-r--r-- | libs/binder/IServiceManager.cpp | 230 |
1 files changed, 230 insertions, 0 deletions
diff --git a/libs/binder/IServiceManager.cpp b/libs/binder/IServiceManager.cpp new file mode 100644 index 0000000..f2d0c27 --- /dev/null +++ b/libs/binder/IServiceManager.cpp @@ -0,0 +1,230 @@ +/* + * Copyright (C) 2005 The Android Open Source Project + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#define LOG_TAG "ServiceManager" + +#include <utils/IServiceManager.h> + +#include <utils/Debug.h> +#include <utils/IPCThreadState.h> +#include <utils/Log.h> +#include <utils/Parcel.h> +#include <utils/String8.h> +#include <utils/SystemClock.h> + +#include <private/binder/Static.h> + +#include <unistd.h> + +namespace android { + +sp<IServiceManager> defaultServiceManager() +{ + if (gDefaultServiceManager != NULL) return gDefaultServiceManager; + + { + AutoMutex _l(gDefaultServiceManagerLock); + if (gDefaultServiceManager == NULL) { + gDefaultServiceManager = interface_cast<IServiceManager>( + ProcessState::self()->getContextObject(NULL)); + } + } + + return gDefaultServiceManager; +} + +bool checkCallingPermission(const String16& permission) +{ + return checkCallingPermission(permission, NULL, NULL); +} + +static String16 _permission("permission"); + +bool checkCallingPermission(const String16& permission, int32_t* outPid, int32_t* outUid) +{ + IPCThreadState* ipcState = IPCThreadState::self(); + int32_t pid = ipcState->getCallingPid(); + int32_t uid = ipcState->getCallingUid(); + if (outPid) *outPid = pid; + if (outUid) *outUid= uid; + + sp<IPermissionController> pc; + gDefaultServiceManagerLock.lock(); + pc = gPermissionController; + gDefaultServiceManagerLock.unlock(); + + int64_t startTime = 0; + + while (true) { + if (pc != NULL) { + bool res = pc->checkPermission(permission, pid, uid); + if (res) { + if (startTime != 0) { + LOGI("Check passed after %d seconds for %s from uid=%d pid=%d", + (int)((uptimeMillis()-startTime)/1000), + String8(permission).string(), uid, pid); + } + return res; + } + + // Is this a permission failure, or did the controller go away? + if (pc->asBinder()->isBinderAlive()) { + LOGW("Permission failure: %s from uid=%d pid=%d", + String8(permission).string(), uid, pid); + return false; + } + + // Object is dead! + gDefaultServiceManagerLock.lock(); + if (gPermissionController == pc) { + gPermissionController = NULL; + } + gDefaultServiceManagerLock.unlock(); + } + + // Need to retrieve the permission controller. + sp<IBinder> binder = defaultServiceManager()->checkService(_permission); + if (binder == NULL) { + // Wait for the permission controller to come back... + if (startTime == 0) { + startTime = uptimeMillis(); + LOGI("Waiting to check permission %s from uid=%d pid=%d", + String8(permission).string(), uid, pid); + } + sleep(1); + } else { + pc = interface_cast<IPermissionController>(binder); + // Install the new permission controller, and try again. + gDefaultServiceManagerLock.lock(); + gPermissionController = pc; + gDefaultServiceManagerLock.unlock(); + } + } +} + +// ---------------------------------------------------------------------- + +class BpServiceManager : public BpInterface<IServiceManager> +{ +public: + BpServiceManager(const sp<IBinder>& impl) + : BpInterface<IServiceManager>(impl) + { + } + + virtual sp<IBinder> getService(const String16& name) const + { + unsigned n; + for (n = 0; n < 5; n++){ + sp<IBinder> svc = checkService(name); + if (svc != NULL) return svc; + LOGI("Waiting for sevice %s...\n", String8(name).string()); + sleep(1); + } + return NULL; + } + + virtual sp<IBinder> checkService( const String16& name) const + { + Parcel data, reply; + data.writeInterfaceToken(IServiceManager::getInterfaceDescriptor()); + data.writeString16(name); + remote()->transact(CHECK_SERVICE_TRANSACTION, data, &reply); + return reply.readStrongBinder(); + } + + virtual status_t addService(const String16& name, const sp<IBinder>& service) + { + Parcel data, reply; + data.writeInterfaceToken(IServiceManager::getInterfaceDescriptor()); + data.writeString16(name); + data.writeStrongBinder(service); + status_t err = remote()->transact(ADD_SERVICE_TRANSACTION, data, &reply); + return err == NO_ERROR ? reply.readInt32() : err; + } + + virtual Vector<String16> listServices() + { + Vector<String16> res; + int n = 0; + + for (;;) { + Parcel data, reply; + data.writeInterfaceToken(IServiceManager::getInterfaceDescriptor()); + data.writeInt32(n++); + status_t err = remote()->transact(LIST_SERVICES_TRANSACTION, data, &reply); + if (err != NO_ERROR) + break; + res.add(reply.readString16()); + } + return res; + } +}; + +IMPLEMENT_META_INTERFACE(ServiceManager, "android.os.IServiceManager"); + +// ---------------------------------------------------------------------- + +#define CHECK_INTERFACE(interface, data, reply) \ + do { if (!data.enforceInterface(interface::getInterfaceDescriptor())) { \ + LOGW("Call incorrectly routed to " #interface); \ + return PERMISSION_DENIED; \ + } } while (0) + +status_t BnServiceManager::onTransact( + uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags) +{ + //printf("ServiceManager received: "); data.print(); + switch(code) { + case GET_SERVICE_TRANSACTION: { + CHECK_INTERFACE(IServiceManager, data, reply); + String16 which = data.readString16(); + sp<IBinder> b = const_cast<BnServiceManager*>(this)->getService(which); + reply->writeStrongBinder(b); + return NO_ERROR; + } break; + case CHECK_SERVICE_TRANSACTION: { + CHECK_INTERFACE(IServiceManager, data, reply); + String16 which = data.readString16(); + sp<IBinder> b = const_cast<BnServiceManager*>(this)->checkService(which); + reply->writeStrongBinder(b); + return NO_ERROR; + } break; + case ADD_SERVICE_TRANSACTION: { + CHECK_INTERFACE(IServiceManager, data, reply); + String16 which = data.readString16(); + sp<IBinder> b = data.readStrongBinder(); + status_t err = addService(which, b); + reply->writeInt32(err); + return NO_ERROR; + } break; + case LIST_SERVICES_TRANSACTION: { + CHECK_INTERFACE(IServiceManager, data, reply); + Vector<String16> list = listServices(); + const size_t N = list.size(); + reply->writeInt32(N); + for (size_t i=0; i<N; i++) { + reply->writeString16(list[i]); + } + return NO_ERROR; + } break; + default: + return BBinder::onTransact(code, data, reply, flags); + } +} + +}; // namespace android + |