1/* 2 * Copyright (C) 2007 The Android Open Source Project 3 * 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 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 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. 15 */ 16 17#ifndef _INIT_DEVICES_H 18#define _INIT_DEVICES_H 19 20#include <sys/stat.h> 21#include <sys/types.h> 22 23#include <algorithm> 24#include <set> 25#include <string> 26#include <vector> 27 28#include <android-base/file.h> 29#include <selinux/label.h> 30 31#include "uevent.h" 32 33namespace android { 34namespace init { 35 36class Permissions { 37 public: 38 Permissions(const std::string& name, mode_t perm, uid_t uid, gid_t gid); 39 40 bool Match(const std::string& path) const; 41 42 mode_t perm() const { return perm_; } 43 uid_t uid() const { return uid_; } 44 gid_t gid() const { return gid_; } 45 46 protected: 47 const std::string& name() const { return name_; } 48 49 private: 50 std::string name_; 51 mode_t perm_; 52 uid_t uid_; 53 gid_t gid_; 54 bool prefix_; 55 bool wildcard_; 56}; 57 58class SysfsPermissions : public Permissions { 59 public: 60 SysfsPermissions(const std::string& name, const std::string& attribute, mode_t perm, uid_t uid, 61 gid_t gid) 62 : Permissions(name, perm, uid, gid), attribute_(attribute) {} 63 64 bool MatchWithSubsystem(const std::string& path, const std::string& subsystem) const; 65 void SetPermissions(const std::string& path) const; 66 67 private: 68 const std::string attribute_; 69}; 70 71class Subsystem { 72 public: 73 friend class SubsystemParser; 74 75 Subsystem() {} 76 Subsystem(std::string name) : name_(std::move(name)) {} 77 78 // Returns the full path for a uevent of a device that is a member of this subsystem, 79 // according to the rules parsed from ueventd.rc 80 std::string ParseDevPath(const Uevent& uevent) const { 81 std::string devname = devname_source_ == DevnameSource::DEVNAME_UEVENT_DEVNAME 82 ? uevent.device_name 83 : android::base::Basename(uevent.path); 84 85 return dir_name_ + "/" + devname; 86 } 87 88 bool operator==(const std::string& string_name) const { return name_ == string_name; } 89 90 private: 91 enum class DevnameSource { 92 DEVNAME_UEVENT_DEVNAME, 93 DEVNAME_UEVENT_DEVPATH, 94 }; 95 96 std::string name_; 97 std::string dir_name_ = "/dev"; 98 DevnameSource devname_source_; 99}; 100 101class DeviceHandler { 102 public: 103 friend class DeviceHandlerTester; 104 105 DeviceHandler(); 106 DeviceHandler(std::vector<Permissions> dev_permissions, 107 std::vector<SysfsPermissions> sysfs_permissions, std::vector<Subsystem> subsystems, 108 std::set<std::string> boot_devices, bool skip_restorecon); 109 ~DeviceHandler(){}; 110 111 void HandleDeviceEvent(const Uevent& uevent); 112 113 std::vector<std::string> GetBlockDeviceSymlinks(const Uevent& uevent) const; 114 void set_skip_restorecon(bool value) { skip_restorecon_ = value; } 115 116 private: 117 bool FindPlatformDevice(std::string path, std::string* platform_device_path) const; 118 std::tuple<mode_t, uid_t, gid_t> GetDevicePermissions( 119 const std::string& path, const std::vector<std::string>& links) const; 120 void MakeDevice(const std::string& path, bool block, int major, int minor, 121 const std::vector<std::string>& links) const; 122 void HandleDevice(const std::string& action, const std::string& devpath, bool block, int major, 123 int minor, const std::vector<std::string>& links) const; 124 void FixupSysPermissions(const std::string& upath, const std::string& subsystem) const; 125 126 std::vector<Permissions> dev_permissions_; 127 std::vector<SysfsPermissions> sysfs_permissions_; 128 std::vector<Subsystem> subsystems_; 129 std::set<std::string> boot_devices_; 130 bool skip_restorecon_; 131 std::string sysfs_mount_point_; 132}; 133 134// Exposed for testing 135void SanitizePartitionName(std::string* string); 136 137} // namespace init 138} // namespace android 139 140#endif 141