/* * Copyright (C) 2015 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. */ #ifndef ANDROID_VOLD_UTILS_H #define ANDROID_VOLD_UTILS_H #include #include #include #include #include // DISALLOW_COPY_AND_ASSIGN disallows the copy and operator= functions. It goes in the private: // declarations in a class. #if !defined(DISALLOW_COPY_AND_ASSIGN) #define DISALLOW_COPY_AND_ASSIGN(TypeName) \ TypeName(const TypeName&) = delete; \ void operator=(const TypeName&) = delete #endif struct DIR; namespace android { namespace vold { /* SELinux contexts used depending on the block device type */ extern security_context_t sBlkidContext; extern security_context_t sBlkidUntrustedContext; extern security_context_t sFsckContext; extern security_context_t sFsckUntrustedContext; status_t CreateDeviceNode(const std::string& path, dev_t dev); status_t DestroyDeviceNode(const std::string& path); /* fs_prepare_dir wrapper that creates with SELinux context */ status_t PrepareDir(const std::string& path, mode_t mode, uid_t uid, gid_t gid); /* Really unmounts the path, killing active processes along the way */ status_t ForceUnmount(const std::string& path); /* Kills any processes using given path */ status_t KillProcessesUsingPath(const std::string& path); /* Creates bind mount from source to target */ status_t BindMount(const std::string& source, const std::string& target); /* Reads filesystem metadata from device at path */ status_t ReadMetadata(const std::string& path, std::string& fsType, std::string& fsUuid, std::string& fsLabel); /* Reads filesystem metadata from untrusted device at path */ status_t ReadMetadataUntrusted(const std::string& path, std::string& fsType, std::string& fsUuid, std::string& fsLabel); /* Returns either WEXITSTATUS() status, or a negative errno */ status_t ForkExecvp(const std::vector& args); status_t ForkExecvp(const std::vector& args, security_context_t context); status_t ForkExecvp(const std::vector& args, std::vector& output); status_t ForkExecvp(const std::vector& args, std::vector& output, security_context_t context); pid_t ForkExecvpAsync(const std::vector& args); status_t ReadRandomBytes(size_t bytes, std::string& out); /* Converts hex string to raw bytes, ignoring [ :-] */ status_t HexToStr(const std::string& hex, std::string& str); /* Converts raw bytes to hex string */ status_t StrToHex(const std::string& str, std::string& hex); /* Normalize given hex string into consistent format */ status_t NormalizeHex(const std::string& in, std::string& out); uint64_t GetFreeBytes(const std::string& path); uint64_t GetTreeBytes(const std::string& path); bool IsFilesystemSupported(const std::string& fsType); /* Wipes contents of block device at given path */ status_t WipeBlockDevice(const std::string& path); std::string BuildKeyPath(const std::string& partGuid); std::string BuildDataSystemLegacyPath(userid_t userid); std::string BuildDataSystemCePath(userid_t userid); std::string BuildDataSystemDePath(userid_t userid); std::string BuildDataMiscLegacyPath(userid_t userid); std::string BuildDataMiscCePath(userid_t userid); std::string BuildDataMiscDePath(userid_t userid); std::string BuildDataProfilesDePath(userid_t userid); std::string BuildDataProfilesForeignDexDePath(userid_t userid); std::string BuildDataPath(const char* volumeUuid); std::string BuildDataMediaCePath(const char* volumeUuid, userid_t userid); std::string BuildDataUserCePath(const char* volumeUuid, userid_t userid); std::string BuildDataUserDePath(const char* volumeUuid, userid_t userid); dev_t GetDevice(const std::string& path); std::string DefaultFstabPath(); status_t RestoreconRecursive(const std::string& path); status_t SaneReadLinkAt(int dirfd, const char* path, char* buf, size_t bufsiz); class ScopedFd { const int fd_; public: ScopedFd(int fd); ~ScopedFd(); int get() const { return fd_; } DISALLOW_COPY_AND_ASSIGN(ScopedFd); }; class ScopedDir { DIR* const dir_; public: ScopedDir(DIR* dir); ~ScopedDir(); DIR* get() const { return dir_; } DISALLOW_COPY_AND_ASSIGN(ScopedDir); }; /* Checks if Android is running in QEMU */ bool IsRunningInEmulator(); } // namespace vold } // namespace android #endif