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