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 "KeyBuffer.h"
22 #include <utils/Errors.h>
23 #include <cutils/multiuser.h>
24 #include <selinux/selinux.h>
29 // DISALLOW_COPY_AND_ASSIGN disallows the copy and operator= functions. It goes in the private:
30 // declarations in a class.
31 #if !defined(DISALLOW_COPY_AND_ASSIGN)
32 #define DISALLOW_COPY_AND_ASSIGN(TypeName) \
33 TypeName(const TypeName&) = delete; \
34 void operator=(const TypeName&) = delete
42 /* SELinux contexts used depending on the block device type */
43 extern security_context_t sBlkidContext;
44 extern security_context_t sBlkidUntrustedContext;
45 extern security_context_t sFsckContext;
46 extern security_context_t sFsckUntrustedContext;
48 status_t CreateDeviceNode(const std::string& path, dev_t dev);
49 status_t DestroyDeviceNode(const std::string& path);
51 /* fs_prepare_dir wrapper that creates with SELinux context */
52 status_t PrepareDir(const std::string& path, mode_t mode, uid_t uid, gid_t gid);
54 /* Really unmounts the path, killing active processes along the way */
55 status_t ForceUnmount(const std::string& path);
57 /* Kills any processes using given path */
58 status_t KillProcessesUsingPath(const std::string& path);
60 /* Creates bind mount from source to target */
61 status_t BindMount(const std::string& source, const std::string& target);
63 /* Reads filesystem metadata from device at path */
64 status_t ReadMetadata(const std::string& path, std::string& fsType,
65 std::string& fsUuid, std::string& fsLabel);
67 /* Reads filesystem metadata from untrusted device at path */
68 status_t ReadMetadataUntrusted(const std::string& path, std::string& fsType,
69 std::string& fsUuid, std::string& fsLabel);
71 /* Returns either WEXITSTATUS() status, or a negative errno */
72 status_t ForkExecvp(const std::vector<std::string>& args);
73 status_t ForkExecvp(const std::vector<std::string>& args, security_context_t context);
75 status_t ForkExecvp(const std::vector<std::string>& args,
76 std::vector<std::string>& output);
77 status_t ForkExecvp(const std::vector<std::string>& args,
78 std::vector<std::string>& output, security_context_t context);
80 pid_t ForkExecvpAsync(const std::vector<std::string>& args);
82 status_t ReadRandomBytes(size_t bytes, std::string& out);
83 status_t ReadRandomBytes(size_t bytes, char* buffer);
84 status_t GenerateRandomUuid(std::string& out);
86 /* Converts hex string to raw bytes, ignoring [ :-] */
87 status_t HexToStr(const std::string& hex, std::string& str);
88 /* Converts raw bytes to hex string */
89 status_t StrToHex(const std::string& str, std::string& hex);
90 /* Converts raw key bytes to hex string */
91 status_t StrToHex(const KeyBuffer& str, KeyBuffer& hex);
92 /* Normalize given hex string into consistent format */
93 status_t NormalizeHex(const std::string& in, std::string& out);
95 uint64_t GetFreeBytes(const std::string& path);
96 uint64_t GetTreeBytes(const std::string& path);
98 bool IsFilesystemSupported(const std::string& fsType);
100 /* Wipes contents of block device at given path */
101 status_t WipeBlockDevice(const std::string& path);
103 std::string BuildKeyPath(const std::string& partGuid);
105 std::string BuildDataSystemLegacyPath(userid_t userid);
106 std::string BuildDataSystemCePath(userid_t userid);
107 std::string BuildDataSystemDePath(userid_t userid);
108 std::string BuildDataMiscLegacyPath(userid_t userid);
109 std::string BuildDataMiscCePath(userid_t userid);
110 std::string BuildDataMiscDePath(userid_t userid);
111 std::string BuildDataProfilesDePath(userid_t userid);
113 std::string BuildDataPath(const char* volumeUuid);
114 std::string BuildDataMediaCePath(const char* volumeUuid, userid_t userid);
115 std::string BuildDataUserCePath(const char* volumeUuid, userid_t userid);
116 std::string BuildDataUserDePath(const char* volumeUuid, userid_t userid);
118 dev_t GetDevice(const std::string& path);
120 status_t RestoreconRecursive(const std::string& path);
122 status_t SaneReadLinkAt(int dirfd, const char* path, char* buf, size_t bufsiz);
124 /* Checks if Android is running in QEMU */
125 bool IsRunningInEmulator();
128 } // namespace android