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newlib-cygwin/winsup/cygwin/fhandler_registry.cc

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/* fhandler_registry.cc: fhandler for /proc/registry virtual filesystem
Copyright 2002 Red Hat, Inc.
This file is part of Cygwin.
This software is a copyrighted work licensed under the terms of the
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
details. */
/* FIXME: Access permissions are ignored at the moment. */
#include "winsup.h"
#include <errno.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/cygwin.h>
#include "cygerrno.h"
#include "security.h"
#include "fhandler.h"
#include "path.h"
#include "dtable.h"
#include "cygheap.h"
#include <assert.h>
#define _COMPILING_NEWLIB
#include <dirent.h>
static const int registry_len = sizeof ("registry") - 1;
/* If this bit is set in __d_position then we are enumerating values,
* else sub-keys. keeping track of where we are is horribly messy
* the bottom 16 bits are the absolute position and the top 15 bits
* make up the value index if we are enuerating values.
*/
static const __off32_t REG_ENUM_VALUES_MASK = 0x8000000;
static const __off32_t REG_POSITION_MASK = 0xffff;
/* List of root keys in /proc/registry.
* Possibly we should filter out those not relevant to the flavour of Windows
* Cygwin is running on.
*/
static const char *registry_listing[] =
{
".",
"..",
"HKEY_CLASSES_ROOT",
"HKEY_CURRENT_CONFIG",
"HKEY_CURRENT_USER",
"HKEY_LOCAL_MACHINE",
"HKEY_USERS",
"HKEY_DYN_DATA", // 95/98/Me
"HKEY_PERFOMANCE_DATA", // NT/2000/XP
NULL
};
static const HKEY registry_keys[] =
{
(HKEY) INVALID_HANDLE_VALUE,
(HKEY) INVALID_HANDLE_VALUE,
HKEY_CLASSES_ROOT,
HKEY_CURRENT_CONFIG,
HKEY_CURRENT_USER,
HKEY_LOCAL_MACHINE,
HKEY_USERS,
HKEY_DYN_DATA,
HKEY_PERFORMANCE_DATA
};
static const int ROOT_KEY_COUNT = sizeof (registry_keys) / sizeof (HKEY);
/* These get added to each subdirectory in /proc/registry.
* If we wanted to implement writing, we could maybe add a '.writable' entry or
* suchlike.
*/
static const char *special_dot_files[] =
{
".",
"..",
NULL
};
static const int SPECIAL_DOT_FILE_COUNT =
(sizeof (special_dot_files) / sizeof (const char *)) - 1;
/* Name given to default values */
static const char *DEFAULT_VALUE_NAME = "@";
static HKEY open_key (const char *name, REGSAM access, bool isValue);
/* Returns 0 if path doesn't exist, >0 if path is a directory,
* <0 if path is a file.
*
* We open the last key but one and then enum it's sub-keys and values to see if the
* final component is there. This gets round the problem of not having security access
* to the final key in the path.
*/
int
fhandler_registry::exists ()
{
int file_type = 0, index = 0, pathlen;
DWORD buf_size = MAX_PATH;
LONG error;
char buf[buf_size];
const char *file;
HKEY hKey = (HKEY) INVALID_HANDLE_VALUE;
const char *path = get_name ();
debug_printf ("exists (%s)", path);
path += proc_len + registry_len + 2;
if (*path == 0)
{
file_type = 2;
goto out;
}
pathlen = strlen (path);
file = path + pathlen - 1;
if (isdirsep (*file) && pathlen > 1)
file--;
while (!isdirsep (*file))
file--;
file++;
if (file == path)
{
for (int i = 0; registry_listing[i]; i++)
if (path_prefix_p
(registry_listing[i], path, strlen (registry_listing[i])))
{
file_type = 1;
goto out;
}
goto out;
}
hKey = open_key (path, KEY_READ, false);
if (hKey != (HKEY) INVALID_HANDLE_VALUE)
file_type = 1;
else
{
hKey = open_key (path, KEY_READ, true);
if (hKey == (HKEY) INVALID_HANDLE_VALUE)
return 0;
while (ERROR_SUCCESS ==
(error = RegEnumKeyEx (hKey, index++, buf, &buf_size, NULL, NULL,
NULL, NULL))
|| (error == ERROR_MORE_DATA))
{
if (pathmatch (buf, file))
{
file_type = 1;
goto out;
}
buf_size = MAX_PATH;
}
if (error != ERROR_NO_MORE_ITEMS)
{
seterrno_from_win_error (__FILE__, __LINE__, error);
goto out;
}
index = 0;
buf_size = MAX_PATH;
while (ERROR_SUCCESS ==
(error = RegEnumValue (hKey, index++, buf, &buf_size, NULL, NULL,
NULL, NULL))
|| (error == ERROR_MORE_DATA))
{
if (pathmatch (buf, file) || (buf[0] == '\0' &&
pathmatch (file, DEFAULT_VALUE_NAME)))
{
file_type = -1;
goto out;
}
buf_size = MAX_PATH;
}
if (error != ERROR_NO_MORE_ITEMS)
{
seterrno_from_win_error (__FILE__, __LINE__, error);
goto out;
}
}
out:
if (hKey != (HKEY) INVALID_HANDLE_VALUE)
RegCloseKey (hKey);
return file_type;
}
fhandler_registry::fhandler_registry ():
fhandler_proc (FH_REGISTRY)
{
}
int
fhandler_registry::fstat (struct __stat64 *buf, path_conv *pc)
{
this->fhandler_base::fstat (buf, pc);
buf->st_mode &= ~_IFMT & NO_W;
int file_type = exists ();
switch (file_type)
{
case 0:
set_errno (ENOENT);
return -1;
case 1:
buf->st_mode |= S_IFDIR | S_IXUSR | S_IXGRP | S_IXOTH;
break;
case 2:
buf->st_mode |= S_IFDIR | S_IXUSR | S_IXGRP | S_IXOTH;
buf->st_nlink = ROOT_KEY_COUNT;
break;
default:
case -1:
buf->st_mode |= S_IFREG;
buf->st_mode &= NO_X;
break;
}
if (file_type != 0 && file_type != 2)
{
HKEY hKey;
const char *path = get_name () + proc_len + registry_len + 2;
hKey =
open_key (path, STANDARD_RIGHTS_READ | KEY_QUERY_VALUE,
(file_type < 0) ? true : false);
if (hKey != (HKEY) INVALID_HANDLE_VALUE)
{
FILETIME ftLastWriteTime;
DWORD subkey_count;
if (ERROR_SUCCESS ==
RegQueryInfoKey (hKey, NULL, NULL, NULL, &subkey_count, NULL,
NULL, NULL, NULL, NULL, NULL,
&ftLastWriteTime))
{
to_timestruc_t (&ftLastWriteTime, &buf->st_mtim);
buf->st_ctim = buf->st_mtim;
time_as_timestruc_t (&buf->st_atim);
if (file_type > 0)
buf->st_nlink = subkey_count;
else
{
int pathlen = strlen (path);
const char *value_name = path + pathlen - 1;
if (isdirsep (*value_name) && pathlen > 1)
value_name--;
while (!isdirsep (*value_name))
value_name--;
value_name++;
DWORD dwSize;
if (ERROR_SUCCESS ==
RegQueryValueEx (hKey, value_name, NULL, NULL, NULL,
&dwSize))
buf->st_size = dwSize;
}
__uid32_t uid;
__gid32_t gid;
if (get_object_attribute
((HANDLE) hKey, SE_REGISTRY_KEY, &buf->st_mode, &uid,
&gid) == 0)
{
buf->st_uid = uid;
buf->st_gid = gid;
buf->st_mode &= ~(S_IWUSR | S_IWGRP | S_IWOTH);
if (file_type > 0)
buf->st_mode |= S_IFDIR;
else
buf->st_mode &= NO_X;
}
}
RegCloseKey (hKey);
}
}
return 0;
}
struct dirent *
fhandler_registry::readdir (DIR * dir)
{
DWORD buf_size = MAX_PATH;
char buf[buf_size];
HANDLE handle;
struct dirent *res = NULL;
const char *path = dir->__d_dirname + proc_len + 1 + registry_len;
LONG error;
if (*path == 0)
{
if (dir->__d_position >= ROOT_KEY_COUNT)
goto out;
strcpy (dir->__d_dirent->d_name, registry_listing[dir->__d_position++]);
res = dir->__d_dirent;
goto out;
}
if (dir->__d_u.__d_data.__handle == INVALID_HANDLE_VALUE
&& dir->__d_position == 0)
{
handle = open_key (path + 1, KEY_READ, false);
dir->__d_u.__d_data.__handle = handle;
}
if (dir->__d_u.__d_data.__handle == INVALID_HANDLE_VALUE)
goto out;
if (dir->__d_position < SPECIAL_DOT_FILE_COUNT)
{
strcpy (dir->__d_dirent->d_name,
special_dot_files[dir->__d_position++]);
res = dir->__d_dirent;
goto out;
}
retry:
if (dir->__d_position & REG_ENUM_VALUES_MASK)
/* For the moment, the type of key is ignored here. when write access is added,
* maybe add an extension for the type of each value?
*/
error = RegEnumValue ((HKEY) dir->__d_u.__d_data.__handle,
(dir->__d_position & ~REG_ENUM_VALUES_MASK) >> 16,
buf, &buf_size, NULL, NULL, NULL, NULL);
else
error =
RegEnumKeyEx ((HKEY) dir->__d_u.__d_data.__handle, dir->__d_position -
SPECIAL_DOT_FILE_COUNT, buf, &buf_size, NULL, NULL, NULL,
NULL);
if (error == ERROR_NO_MORE_ITEMS
&& (dir->__d_position & REG_ENUM_VALUES_MASK) == 0)
{
/* If we're finished with sub-keys, start on values under this key. */
dir->__d_position |= REG_ENUM_VALUES_MASK;
buf_size = MAX_PATH;
goto retry;
}
if (error != ERROR_SUCCESS && error != ERROR_MORE_DATA)
{
RegCloseKey ((HKEY) dir->__d_u.__d_data.__handle);
dir->__d_u.__d_data.__handle = INVALID_HANDLE_VALUE;
seterrno_from_win_error (__FILE__, __LINE__, error);
goto out;
}
/* We get here if `buf' contains valid data. */
if (*buf == 0)
strcpy (dir->__d_dirent->d_name, DEFAULT_VALUE_NAME);
else
strcpy (dir->__d_dirent->d_name, buf);
dir->__d_position++;
if (dir->__d_position & REG_ENUM_VALUES_MASK)
dir->__d_position += 0x10000;
res = dir->__d_dirent;
out:
syscall_printf ("%p = readdir (%p)", &dir->__d_dirent, dir);
return res;
}
__off64_t
fhandler_registry::telldir (DIR * dir)
{
return dir->__d_position & REG_POSITION_MASK;
}
void
fhandler_registry::seekdir (DIR * dir, __off64_t loc)
{
/* Unfortunately cannot simply set __d_position due to transition from sub-keys to
* values.
*/
rewinddir (dir);
while (loc > (dir->__d_position & REG_POSITION_MASK))
if (!readdir (dir))
break;
}
void
fhandler_registry::rewinddir (DIR * dir)
{
if (dir->__d_u.__d_data.__handle != INVALID_HANDLE_VALUE)
{
(void) RegCloseKey ((HKEY) dir->__d_u.__d_data.__handle);
dir->__d_u.__d_data.__handle = INVALID_HANDLE_VALUE;
}
dir->__d_position = 0;
return;
}
int
fhandler_registry::closedir (DIR * dir)
{
int res = 0;
if (dir->__d_u.__d_data.__handle != INVALID_HANDLE_VALUE &&
RegCloseKey ((HKEY) dir->__d_u.__d_data.__handle) != ERROR_SUCCESS)
{
__seterrno ();
res = -1;
}
syscall_printf ("%d = closedir (%p)", res, dir);
return 0;
}
int
fhandler_registry::open (path_conv * pc, int flags, mode_t mode)
{
int pathlen;
const char *file;
HKEY handle;
int res = fhandler_virtual::open (pc, flags, mode);
if (!res)
goto out;
const char *path;
path = get_name () + proc_len + 1 + registry_len;
if (!*path)
{
if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
{
set_errno (EEXIST);
res = 0;
goto out;
}
else if (flags & O_WRONLY)
{
set_errno (EISDIR);
res = 0;
goto out;
}
else
{
flags |= O_DIROPEN;
goto success;
}
}
path++;
pathlen = strlen (path);
file = path + pathlen - 1;
if (isdirsep (*file) && pathlen > 1)
file--;
while (!isdirsep (*file))
file--;
file++;
if (file == path)
{
for (int i = 0; registry_listing[i]; i++)
if (path_prefix_p
(registry_listing[i], path, strlen (registry_listing[i])))
{
if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
{
set_errno (EEXIST);
res = 0;
goto out;
}
else if (flags & O_WRONLY)
{
set_errno (EISDIR);
res = 0;
goto out;
}
else
{
flags |= O_DIROPEN;
goto success;
}
}
if (flags & O_CREAT)
{
set_errno (EROFS);
res = 0;
goto out;
}
else
{
set_errno (ENOENT);
res = 0;
goto out;
}
}
if (flags & O_WRONLY)
{
set_errno (EROFS);
res = 0;
goto out;
}
handle = open_key (path, KEY_READ, true);
if (handle == (HKEY) INVALID_HANDLE_VALUE)
{
res = 0;
goto out;
}
set_io_handle (handle);
if (pathmatch (file, DEFAULT_VALUE_NAME))
value_name = cstrdup ("");
else
value_name = cstrdup (file);
if (!fill_filebuf ())
{
RegCloseKey (handle);
res = 0;
goto out;
}
if (flags & O_APPEND)
position = filesize;
else
position = 0;
success:
res = 1;
set_flags ((flags & ~O_TEXT) | O_BINARY);
set_open_status ();
out:
syscall_printf ("%d = fhandler_registry::open (%p, %d)", res, flags, mode);
return res;
}
int
fhandler_registry::close ()
{
int res = fhandler_virtual::close ();
if (res != 0)
return res;
HKEY handle = (HKEY) get_handle ();
if (handle != (HKEY) INVALID_HANDLE_VALUE)
{
if (RegCloseKey (handle) != ERROR_SUCCESS)
{
__seterrno ();
res = -1;
}
}
if (value_name)
cfree (value_name);
return res;
}
bool
fhandler_registry::fill_filebuf ()
{
DWORD type, size;
LONG error;
HKEY handle = (HKEY) get_handle ();
if (handle != HKEY_PERFORMANCE_DATA)
{
error = RegQueryValueEx (handle, value_name, NULL, &type, NULL, &size);
if (error != ERROR_SUCCESS)
{
if (error != ERROR_FILE_NOT_FOUND)
{
seterrno_from_win_error (__FILE__, __LINE__, error);
return false;
}
goto value_not_found;
}
bufalloc = size;
filebuf = (char *) malloc (bufalloc);
error =
RegQueryValueEx (handle, value_name, NULL, NULL, (BYTE *) filebuf,
&size);
if (error != ERROR_SUCCESS)
{
seterrno_from_win_error (__FILE__, __LINE__, error);
return true;
}
filesize = size;
}
else
{
bufalloc = 0;
do
{
bufalloc += 1000;
filebuf = (char *) realloc (filebuf, bufalloc);
error = RegQueryValueEx (handle, value_name, NULL, &type,
(BYTE *) filebuf, &size);
if (error != ERROR_SUCCESS && error != ERROR_MORE_DATA)
{
if (error != ERROR_FILE_NOT_FOUND)
{
seterrno_from_win_error (__FILE__, __LINE__, error);
return true;
}
goto value_not_found;
}
}
while (error == ERROR_MORE_DATA);
filesize = size;
}
return true;
value_not_found:
DWORD buf_size = MAX_PATH;
char buf[buf_size];
int index = 0;
while (ERROR_SUCCESS ==
(error = RegEnumKeyEx (handle, index++, buf, &buf_size, NULL, NULL,
NULL, NULL)) || (error == ERROR_MORE_DATA))
{
if (pathmatch (buf, value_name))
{
set_errno (EISDIR);
return false;
}
buf_size = MAX_PATH;
}
if (error != ERROR_NO_MORE_ITEMS)
{
seterrno_from_win_error (__FILE__, __LINE__, error);
return false;
}
set_errno (ENOENT);
return false;
}
/* Auxillary member function to open registry keys. */
static HKEY
open_key (const char *name, REGSAM access, bool isValue)
{
HKEY hKey = (HKEY) INVALID_HANDLE_VALUE;
HKEY hParentKey = (HKEY) INVALID_HANDLE_VALUE;
bool parentOpened = false;
char component[MAX_PATH];
while (*name)
{
const char *anchor = name;
while (*name && !isdirsep (*name))
name++;
strncpy (component, anchor, name - anchor);
component[name - anchor] = '\0';
if (*name)
name++;
if (*name == 0 && isValue == true)
goto out;
if (hParentKey != (HKEY) INVALID_HANDLE_VALUE)
{
REGSAM effective_access = KEY_READ;
if ((strchr (name, '/') == NULL && isValue == true) || *name == 0)
effective_access = access;
LONG
error =
RegOpenKeyEx (hParentKey, component, 0, effective_access, &hKey);
if (error != ERROR_SUCCESS)
{
hKey = (HKEY) INVALID_HANDLE_VALUE;
seterrno_from_win_error (__FILE__, __LINE__, error);
return hKey;
}
if (parentOpened)
RegCloseKey (hParentKey);
hParentKey = hKey;
parentOpened = true;
}
else
{
for (int i = 0; registry_listing[i]; i++)
if (pathmatch (component, registry_listing[i]))
hKey = registry_keys[i];
if (hKey == (HKEY) INVALID_HANDLE_VALUE)
return hKey;
hParentKey = hKey;
}
}
out:
return hKey;
}
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