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/*
* Copyright (C) 2018 The Android Open Source Project
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#pragma once
#include <grp.h>
#include <pwd.h>
#include "private/bionic_lock.h"
#include "platform/bionic/macros.h"
#include "private/grp_pwd.h"
class MmapFile {
public:
MmapFile(const char* filename, const char* required_prefix);
template <typename Line>
bool FindById(uid_t uid, Line* line);
template <typename Line>
bool FindByName(const char* name, Line* line);
void Unmap();
BIONIC_DISALLOW_IMPLICIT_CONSTRUCTORS(MmapFile);
private:
enum class FileStatus {
Uninitialized,
Initialized,
Error,
};
bool GetFile(const char** start, const char** end);
bool DoMmap();
template <typename Line, typename Predicate>
bool Find(Line* line, Predicate predicate);
FileStatus status_ = FileStatus::Uninitialized;
Lock lock_;
const char* filename_ = nullptr;
const char* start_ = nullptr;
const char* end_ = nullptr;
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wunused-private-field"
const char* required_prefix_;
#pragma clang diagnostic pop
};
class PasswdFile {
public:
PasswdFile(const char* filename, const char* required_prefix);
bool FindById(uid_t id, passwd_state_t* passwd_state);
bool FindByName(const char* name, passwd_state_t* passwd_state);
void Unmap() {
mmap_file_.Unmap();
}
BIONIC_DISALLOW_IMPLICIT_CONSTRUCTORS(PasswdFile);
private:
MmapFile mmap_file_;
};
class GroupFile {
public:
GroupFile(const char* filename, const char* required_prefix);
bool FindById(gid_t id, group_state_t* group_state);
bool FindByName(const char* name, group_state_t* group_state);
void Unmap() {
mmap_file_.Unmap();
}
BIONIC_DISALLOW_IMPLICIT_CONSTRUCTORS(GroupFile);
private:
MmapFile mmap_file_;
};
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