2 * Copyright (C) 2015 The Android Open Source Project
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
8 * http://www.apache.org/licenses/LICENSE-2.0
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.
17 #ifndef ANDROID_VOLD_UTILS_H
18 #define ANDROID_VOLD_UTILS_H
20 #include <utils/Errors.h>
21 #include <cutils/multiuser.h>
22 #include <selinux/selinux.h>
27 // DISALLOW_COPY_AND_ASSIGN disallows the copy and operator= functions. It goes in the private:
28 // declarations in a class.
29 #if !defined(DISALLOW_COPY_AND_ASSIGN)
30 #define DISALLOW_COPY_AND_ASSIGN(TypeName) \
31 TypeName(const TypeName&) = delete; \
32 void operator=(const TypeName&) = delete
40 /* SELinux contexts used depending on the block device type */
41 extern security_context_t sBlkidContext;
42 extern security_context_t sBlkidUntrustedContext;
43 extern security_context_t sFsckContext;
44 extern security_context_t sFsckUntrustedContext;
46 status_t CreateDeviceNode(const std::string& path, dev_t dev);
47 status_t DestroyDeviceNode(const std::string& path);
49 /* fs_prepare_dir wrapper that creates with SELinux context */
50 status_t PrepareDir(const std::string& path, mode_t mode, uid_t uid, gid_t gid);
52 /* Really unmounts the path, killing active processes along the way */
53 status_t ForceUnmount(const std::string& path);
55 /* Kills any processes using given path */
56 status_t KillProcessesUsingPath(const std::string& path);
58 /* Creates bind mount from source to target */
59 status_t BindMount(const std::string& source, const std::string& target);
61 /* Reads filesystem metadata from device at path */
62 status_t ReadMetadata(const std::string& path, std::string& fsType,
63 std::string& fsUuid, std::string& fsLabel);
65 /* Reads filesystem metadata from untrusted device at path */
66 status_t ReadMetadataUntrusted(const std::string& path, std::string& fsType,
67 std::string& fsUuid, std::string& fsLabel);
69 /* Returns either WEXITSTATUS() status, or a negative errno */
70 status_t ForkExecvp(const std::vector<std::string>& args);
71 status_t ForkExecvp(const std::vector<std::string>& args, security_context_t context);
73 status_t ForkExecvp(const std::vector<std::string>& args,
74 std::vector<std::string>& output);
75 status_t ForkExecvp(const std::vector<std::string>& args,
76 std::vector<std::string>& output, security_context_t context);
78 pid_t ForkExecvpAsync(const std::vector<std::string>& args);
80 status_t ReadRandomBytes(size_t bytes, std::string& out);
82 /* Converts hex string to raw bytes, ignoring [ :-] */
83 status_t HexToStr(const std::string& hex, std::string& str);
84 /* Converts raw bytes to hex string */
85 status_t StrToHex(const std::string& str, std::string& hex);
86 /* Normalize given hex string into consistent format */
87 status_t NormalizeHex(const std::string& in, std::string& out);
89 uint64_t GetFreeBytes(const std::string& path);
90 uint64_t GetTreeBytes(const std::string& path);
92 bool IsFilesystemSupported(const std::string& fsType);
94 /* Wipes contents of block device at given path */
95 status_t WipeBlockDevice(const std::string& path);
97 std::string BuildKeyPath(const std::string& partGuid);
99 std::string BuildDataSystemLegacyPath(userid_t userid);
100 std::string BuildDataSystemCePath(userid_t userid);
101 std::string BuildDataSystemDePath(userid_t userid);
102 std::string BuildDataMiscLegacyPath(userid_t userid);
103 std::string BuildDataMiscCePath(userid_t userid);
104 std::string BuildDataMiscDePath(userid_t userid);
105 std::string BuildDataProfilesDePath(userid_t userid);
107 std::string BuildDataPath(const char* volumeUuid);
108 std::string BuildDataMediaCePath(const char* volumeUuid, userid_t userid);
109 std::string BuildDataUserCePath(const char* volumeUuid, userid_t userid);
110 std::string BuildDataUserDePath(const char* volumeUuid, userid_t userid);
112 dev_t GetDevice(const std::string& path);
114 status_t RestoreconRecursive(const std::string& path);
116 status_t SaneReadLinkAt(int dirfd, const char* path, char* buf, size_t bufsiz);
118 /* Checks if Android is running in QEMU */
119 bool IsRunningInEmulator();
122 } // namespace android