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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. 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 HOLDER 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 <AK/Span.h>
#include <Kernel/FileSystem/InodeIdentifier.h>
#include <Kernel/KResult.h>
#include <Kernel/UnixTypes.h>
namespace Kernel {
class Process;
constexpr u32 encoded_device(unsigned major, unsigned minor)
{
return (minor & 0xff) | (major << 8) | ((minor & ~0xff) << 12);
}
inline bool is_directory(mode_t mode) { return (mode & S_IFMT) == S_IFDIR; }
inline bool is_character_device(mode_t mode) { return (mode & S_IFMT) == S_IFCHR; }
inline bool is_block_device(mode_t mode) { return (mode & S_IFMT) == S_IFBLK; }
inline bool is_regular_file(mode_t mode) { return (mode & S_IFMT) == S_IFREG; }
inline bool is_fifo(mode_t mode) { return (mode & S_IFMT) == S_IFIFO; }
inline bool is_symlink(mode_t mode) { return (mode & S_IFMT) == S_IFLNK; }
inline bool is_socket(mode_t mode) { return (mode & S_IFMT) == S_IFSOCK; }
inline bool is_sticky(mode_t mode) { return mode & S_ISVTX; }
inline bool is_setuid(mode_t mode) { return mode & S_ISUID; }
inline bool is_setgid(mode_t mode) { return mode & S_ISGID; }
struct InodeMetadata {
bool is_valid() const { return inode.is_valid(); }
bool may_read(const Process&) const;
bool may_write(const Process&) const;
bool may_execute(const Process&) const;
bool may_read(uid_t u, gid_t g, Span<const gid_t> eg) const
{
if (u == 0)
return true;
if (uid == u)
return mode & S_IRUSR;
if (gid == g || eg.contains_slow(gid))
return mode & S_IRGRP;
return mode & S_IROTH;
}
bool may_write(uid_t u, gid_t g, Span<const gid_t> eg) const
{
if (u == 0)
return true;
if (uid == u)
return mode & S_IWUSR;
if (gid == g || eg.contains_slow(gid))
return mode & S_IWGRP;
return mode & S_IWOTH;
}
bool may_execute(uid_t u, gid_t g, Span<const gid_t> eg) const
{
if (u == 0)
return true;
if (uid == u)
return mode & S_IXUSR;
if (gid == g || eg.contains_slow(gid))
return mode & S_IXGRP;
return mode & S_IXOTH;
}
bool is_directory() const { return Kernel::is_directory(mode); }
bool is_character_device() const { return Kernel::is_character_device(mode); }
bool is_block_device() const { return Kernel::is_block_device(mode); }
bool is_device() const { return is_character_device() || is_block_device(); }
bool is_regular_file() const { return Kernel::is_regular_file(mode); }
bool is_fifo() const { return Kernel::is_fifo(mode); }
bool is_symlink() const { return Kernel::is_symlink(mode); }
bool is_socket() const { return Kernel::is_socket(mode); }
bool is_sticky() const { return Kernel::is_sticky(mode); }
bool is_setuid() const { return Kernel::is_setuid(mode); }
bool is_setgid() const { return Kernel::is_setgid(mode); }
KResult stat(stat& buffer) const
{
if (!is_valid())
return EIO;
buffer.st_rdev = encoded_device(major_device, minor_device);
buffer.st_ino = inode.index().value();
buffer.st_mode = mode;
buffer.st_nlink = link_count;
buffer.st_uid = uid;
buffer.st_gid = gid;
buffer.st_dev = 0; // FIXME
buffer.st_size = size;
buffer.st_blksize = block_size;
buffer.st_blocks = block_count;
buffer.st_atime = atime;
buffer.st_mtime = mtime;
buffer.st_ctime = ctime;
return KSuccess;
}
InodeIdentifier inode;
off_t size { 0 };
mode_t mode { 0 };
uid_t uid { 0 };
gid_t gid { 0 };
nlink_t link_count { 0 };
time_t atime { 0 };
time_t ctime { 0 };
time_t mtime { 0 };
time_t dtime { 0 };
blkcnt_t block_count { 0 };
blksize_t block_size { 0 };
unsigned major_device { 0 };
unsigned minor_device { 0 };
};
}
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