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/* Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA */
#include "mysys_priv.h"
#include "my_sys.h"
#include <m_string.h>
#include "my_thread_local.h"
#ifdef _WIN32
/*
Check a file or path for accessability.
SYNOPSIS
file_access()
path Path to file
amode Access method
DESCRIPTION
This function wraps the normal access method because the access
available in MSVCRT> +reports that filenames such as LPT1 and
COM1 are valid (they are but should not be so for us).
RETURN VALUES
0 ok
-1 error (We use -1 as my_access is mapped to access on other platforms)
*/
int my_access(const char *path, int amode)
{
WIN32_FILE_ATTRIBUTE_DATA fileinfo;
BOOL result;
result= GetFileAttributesEx(path, GetFileExInfoStandard, &fileinfo);
if (! result ||
(fileinfo.dwFileAttributes & FILE_ATTRIBUTE_READONLY) && (amode & W_OK))
{
errno= EACCES;
set_my_errno(EACCES);
return -1;
}
return 0;
}
#endif /* _WIN32 */
/*
List of file names that causes problem on windows
NOTE that one can also not have file names of type CON.TXT
NOTE: it is important to keep "CLOCK$" on the first place,
we skip it in check_if_legal_tablename.
*/
static const char *reserved_names[]=
{
"CLOCK$",
"CON", "PRN", "AUX", "NUL",
"COM1", "COM2", "COM3", "COM4", "COM5", "COM6", "COM7", "COM8", "COM9",
"LPT1", "LPT2", "LPT3", "LPT4", "LPT5", "LPT6", "LPT7", "LPT8", "LPT9",
NullS
};
#define MAX_RESERVED_NAME_LENGTH 6
/*
Looks up a null-terminated string in a list,
case insensitively.
SYNOPSIS
str_list_find()
list list of items
str item to find
RETURN
0 ok
1 reserved file name
*/
static int str_list_find(const char **list, const char *str)
{
const char **name;
for (name= list; *name; name++)
{
if (!my_strcasecmp(&my_charset_latin1, *name, str))
return 1;
}
return 0;
}
/*
A map for faster reserved_names lookup,
helps to avoid loops in many cases.
1 - can be the first letter
2 - can be the second letter
4 - can be the third letter
*/
static char reserved_map[256]=
{
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* ................ */
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* ................ */
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* !"#$%&'()*+,-./ */
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0123456789:;<=>? */
0,1,0,1,0,0,0,0,0,0,0,0,7,4,5,2, /* @ABCDEFGHIJKLMNO */
3,0,2,0,4,2,0,0,4,0,0,0,0,0,0,0, /* PQRSTUVWXYZ[\]^_ */
0,1,0,1,0,0,0,0,0,0,0,0,7,4,5,2, /* bcdefghijklmno */
3,0,2,0,4,2,0,0,4,0,0,0,0,0,0,0, /* pqrstuvwxyz{|}~. */
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* ................ */
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* ................ */
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* ................ */
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* ................ */
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* ................ */
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* ................ */
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* ................ */
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 /* ................ */
};
/*
Check if a table name may cause problems
SYNOPSIS
check_if_legal_tablename
name Table name (without any extensions)
DESCRIPTION
We don't check 'CLOCK$' because dollar sign is encoded as @0024,
making table file name 'CLOCK@0024', which is safe.
This is why we start lookup from the second element
(i.e. &reserver_name[1])
RETURN
0 ok
1 reserved file name
*/
int check_if_legal_tablename(const char *name)
{
DBUG_ENTER("check_if_legal_tablename");
DBUG_RETURN(name[0] != 0 && name[1] != 0 &&
(reserved_map[(uchar) name[0]] & 1) &&
(reserved_map[(uchar) name[1]] & 2) &&
(reserved_map[(uchar) name[2]] & 4) &&
str_list_find(&reserved_names[1], name));
}
#ifdef _WIN32
/**
Checks if the drive letter supplied is valid or not. Valid drive
letters are A to Z, both lower case and upper case.
@param drive_letter : The drive letter to validate.
@return TRUE if the drive exists, FALSE otherwise.
*/
static my_bool does_drive_exists(char drive_letter)
{
DWORD drive_mask= GetLogicalDrives();
drive_letter= toupper(drive_letter);
return (drive_letter >= 'A' && drive_letter <= 'Z') &&
(drive_mask & (0x1 << (drive_letter - 'A')));
}
/**
Verifies if the file name supplied is allowed or not. On Windows
file names with a colon (:) are not allowed because such file names
store data in Alternate Data Streams which can be used to hide
the data.
@param name contains the file name with or without path
@param length contains the length of file name
@param allow_current_dir TRUE if paths like C:foobar are allowed,
FALSE otherwise
@return TRUE if the file name is allowed, FALSE otherwise.
*/
my_bool is_filename_allowed(const char *name MY_ATTRIBUTE((unused)),
size_t length MY_ATTRIBUTE((unused)),
my_bool allow_current_dir MY_ATTRIBUTE((unused)))
{
/*
For Windows, check if the file name contains : character.
Start from end of path and search if the file name contains :
*/
const char* ch = NULL;
for (ch= name + length - 1; ch >= name; --ch)
{
if (FN_LIBCHAR == *ch || '/' == *ch)
break;
else if (':' == *ch)
{
/*
File names like C:foobar.txt are allowed since the syntax means
file foobar.txt in current directory of C drive. However file
names likes CC:foobar are not allowed since this syntax means ADS
foobar in file CC.
*/
return (allow_current_dir && (ch - name == 1) &&
does_drive_exists(*name));
}
}
return TRUE;
} /* is_filename_allowed */
#endif /* _WIN32 */
#if defined(_WIN32)
/*
Check if a path will access a reserverd file name that may cause problems
SYNOPSIS
check_if_legal_filename
path Path to file
RETURN
0 ok
1 reserved file name
*/
int check_if_legal_filename(const char *path)
{
const char *end;
const char **reserved_name;
DBUG_ENTER("check_if_legal_filename");
if (!is_filename_allowed(path, strlen(path), TRUE))
DBUG_RETURN(1);
path+= dirname_length(path); /* To start of filename */
if (!(end= strchr(path, FN_EXTCHAR)))
end= strend(path);
if (path == end || (uint) (end - path) > MAX_RESERVED_NAME_LENGTH)
DBUG_RETURN(0); /* Simplify inner loop */
for (reserved_name= reserved_names; *reserved_name; reserved_name++)
{
const char *reserved= *reserved_name; /* never empty */
const char *name= path;
do
{
if (*reserved != my_toupper(&my_charset_latin1, *name))
break;
if (++name == end && !reserved[1])
DBUG_RETURN(1); /* Found wrong path */
} while (*++reserved);
}
DBUG_RETURN(0);
}
#endif /* defined(_WIN32) */
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