blob: e820711f127cad111d3c6785b77012cbc3302b4b [file] [log] [blame]
* 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
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* See the License for the specific language governing permissions and
* limitations under the License.
#include "KeyBuffer.h"
#include <android-base/macros.h>
#include <android-base/unique_fd.h>
#include <cutils/multiuser.h>
#include <selinux/selinux.h>
#include <utils/Errors.h>
#include <chrono>
#include <string>
#include <vector>
struct DIR;
static const char* kPropFuse = "persist.sys.fuse";
static const char* kVoldAppDataIsolationEnabled = "persist.sys.vold_app_data_isolation_enabled";
static const char* kExternalStorageSdcardfs = "external_storage.sdcardfs.enabled";
/* 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;
// TODO remove this with better solution, b/64143519
extern bool sSleepOnUnmount;
std::string GetFuseMountPathForUser(userid_t user_id, const std::string& relative_upper_path);
android::status_t CreateDeviceNode(const std::string& path, dev_t dev);
android::status_t DestroyDeviceNode(const std::string& path);
android::status_t AbortFuseConnections();
int SetQuotaInherit(const std::string& path);
int SetQuotaProjectId(const std::string& path, long projectId);
* Creates and sets up an application-specific path on external
* storage with the correct ACL and project ID (if needed).
* ONLY for use with app-specific data directories on external storage!
* (eg, /Android/data/, /Android/obb/, etc.)
int PrepareAppDirFromRoot(const std::string& path, const std::string& root, int appUid,
bool fixupExisting);
/* fs_prepare_dir wrapper that creates with SELinux context */
android::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 */
android::status_t ForceUnmount(const std::string& path);
/* Kills any processes using given path */
android::status_t KillProcessesUsingPath(const std::string& path);
/* Kills any processes using given mount prifix */
android::status_t KillProcessesWithMountPrefix(const std::string& path);
/* Creates bind mount from source to target */
android::status_t BindMount(const std::string& source, const std::string& target);
/** Creates a symbolic link to target */
android::status_t Symlink(const std::string& target, const std::string& linkpath);
/** Calls unlink(2) at linkpath */
android::status_t Unlink(const std::string& linkpath);
/** Creates the given directory if it is not already available */
android::status_t CreateDir(const std::string& dir, mode_t mode);
bool FindValue(const std::string& raw, const std::string& key, std::string* value);
/* Reads filesystem metadata from device at path */
android::status_t ReadMetadata(const std::string& path, std::string* fsType, std::string* fsUuid,
std::string* fsLabel);
/* Reads filesystem metadata from untrusted device at path */
android::status_t ReadMetadataUntrusted(const std::string& path, std::string* fsType, std::string* fsUuid,
std::string* fsLabel);
/* Returns either WEXITSTATUS() status, or a negative errno */
android::status_t ForkExecvp(const std::vector<std::string>& args, std::vector<std::string>* output = nullptr,
security_context_t context = nullptr);
pid_t ForkExecvpAsync(const std::vector<std::string>& args);
/* Gets block device size in bytes */
android::status_t GetBlockDevSize(int fd, uint64_t* size);
android::status_t GetBlockDevSize(const std::string& path, uint64_t* size);
/* Gets block device size in 512 byte sectors */
android::status_t GetBlockDev512Sectors(const std::string& path, uint64_t* nr_sec);
android::status_t ReadRandomBytes(size_t bytes, std::string& out);
android::status_t ReadRandomBytes(size_t bytes, char* buffer);
android::status_t GenerateRandomUuid(std::string& out);
/* Converts hex string to raw bytes, ignoring [ :-] */
android::status_t HexToStr(const std::string& hex, std::string& str);
/* Converts raw bytes to hex string */
android::status_t StrToHex(const std::string& str, std::string& hex);
/* Converts raw key bytes to hex string */
android::status_t StrToHex(const KeyBuffer& str, KeyBuffer& hex);
/* Normalize given hex string into consistent format */
android::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);
bool IsSdcardfsUsed();
bool IsFuseDaemon(const pid_t pid);
/* Wipes contents of block device at given path */
android::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 BuildDataVendorCePath(userid_t userid);
std::string BuildDataVendorDePath(userid_t userid);
std::string BuildDataPath(const std::string& volumeUuid);
std::string BuildDataMediaCePath(const std::string& volumeUuid, userid_t userid);
std::string BuildDataUserCePath(const std::string& volumeUuid, userid_t userid);
std::string BuildDataUserDePath(const std::string& volumeUuid, userid_t userid);
dev_t GetDevice(const std::string& path);
android::status_t EnsureDirExists(const std::string& path, mode_t mode, uid_t uid, gid_t gid);
android::status_t RestoreconRecursive(const std::string& path);
// TODO: promote to android::base
bool Readlinkat(int dirfd, const std::string& path, std::string* result);
// Handles dynamic major assignment for virtio-block
bool IsVirtioBlkDevice(unsigned int major);
android::status_t UnmountTreeWithPrefix(const std::string& prefix);
android::status_t UnmountTree(const std::string& mountPoint);
android::status_t DeleteDirContentsAndDir(const std::string& pathname);
android::status_t DeleteDirContents(const std::string& pathname);
android::status_t WaitForFile(const char* filename, std::chrono::nanoseconds timeout);
bool FsyncDirectory(const std::string& dirname);
bool writeStringToFile(const std::string& payload, const std::string& filename);
void ConfigureMaxDirtyRatioForFuse(const std::string& fuse_mount, unsigned int max_ratio);
void ConfigureReadAheadForFuse(const std::string& fuse_mount, size_t read_ahead_kb);
android::status_t MountUserFuse(userid_t user_id, const std::string& absolute_lower_path,
const std::string& relative_upper_path, android::base::unique_fd* fuse_fd);
android::status_t UnmountUserFuse(userid_t userId, const std::string& absolute_lower_path,
const std::string& relative_upper_path);
android::status_t PrepareAndroidDirs(const std::string& volumeRoot);