9c8d6dd7de
1) Check subsystems list before doing usb subsystem logic. This allows
developers to handle usb* subsystems in ueventd.rc files.
2) Fix a bug where each subsystem_ instance is not reinitialized, but
rather only the name_ member was set.
Test: boot bullhead
Test: check that multiple uevent_devname subsystems work when
specified in ueventd.rc
Change-Id: Ifcac04763afcaf72a3b14ef5f3a6cb89981b51a1
138 lines
4.1 KiB
C++
138 lines
4.1 KiB
C++
/*
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* Copyright (C) 2007 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef _INIT_DEVICES_H
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#define _INIT_DEVICES_H
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <algorithm>
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#include <string>
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#include <vector>
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#include <android-base/file.h>
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#include <selinux/label.h>
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#include "uevent.h"
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namespace android {
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namespace init {
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class Permissions {
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public:
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Permissions(const std::string& name, mode_t perm, uid_t uid, gid_t gid);
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bool Match(const std::string& path) const;
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mode_t perm() const { return perm_; }
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uid_t uid() const { return uid_; }
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gid_t gid() const { return gid_; }
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protected:
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const std::string& name() const { return name_; }
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private:
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std::string name_;
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mode_t perm_;
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uid_t uid_;
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gid_t gid_;
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bool prefix_;
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bool wildcard_;
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};
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class SysfsPermissions : public Permissions {
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public:
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SysfsPermissions(const std::string& name, const std::string& attribute, mode_t perm, uid_t uid,
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gid_t gid)
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: Permissions(name, perm, uid, gid), attribute_(attribute) {}
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bool MatchWithSubsystem(const std::string& path, const std::string& subsystem) const;
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void SetPermissions(const std::string& path) const;
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private:
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const std::string attribute_;
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};
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class Subsystem {
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public:
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friend class SubsystemParser;
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Subsystem() {}
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Subsystem(std::string name) : name_(std::move(name)) {}
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// Returns the full path for a uevent of a device that is a member of this subsystem,
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// according to the rules parsed from ueventd.rc
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std::string ParseDevPath(const Uevent& uevent) const {
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std::string devname = devname_source_ == DevnameSource::DEVNAME_UEVENT_DEVNAME
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? uevent.device_name
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: android::base::Basename(uevent.path);
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return dir_name_ + "/" + devname;
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}
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bool operator==(const std::string& string_name) const { return name_ == string_name; }
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private:
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enum class DevnameSource {
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DEVNAME_UEVENT_DEVNAME,
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DEVNAME_UEVENT_DEVPATH,
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};
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std::string name_;
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std::string dir_name_ = "/dev";
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DevnameSource devname_source_;
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};
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class DeviceHandler {
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public:
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friend class DeviceHandlerTester;
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DeviceHandler();
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DeviceHandler(std::vector<Permissions> dev_permissions,
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std::vector<SysfsPermissions> sysfs_permissions,
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std::vector<Subsystem> subsystems, bool skip_restorecon);
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~DeviceHandler(){};
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void HandleDeviceEvent(const Uevent& uevent);
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std::vector<std::string> GetBlockDeviceSymlinks(const Uevent& uevent) const;
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void set_skip_restorecon(bool value) { skip_restorecon_ = value; }
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private:
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bool FindPlatformDevice(std::string path, std::string* platform_device_path) const;
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std::tuple<mode_t, uid_t, gid_t> GetDevicePermissions(
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const std::string& path, const std::vector<std::string>& links) const;
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void MakeDevice(const std::string& path, bool block, int major, int minor,
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const std::vector<std::string>& links) const;
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void HandleDevice(const std::string& action, const std::string& devpath, bool block, int major,
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int minor, const std::vector<std::string>& links) const;
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void FixupSysPermissions(const std::string& upath, const std::string& subsystem) const;
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std::vector<Permissions> dev_permissions_;
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std::vector<SysfsPermissions> sysfs_permissions_;
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std::vector<Subsystem> subsystems_;
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bool skip_restorecon_;
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std::string sysfs_mount_point_;
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};
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// Exposed for testing
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void SanitizePartitionName(std::string* string);
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} // namespace init
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} // namespace android
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#endif
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