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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 <sys/fcntl.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 <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;
/* 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_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);
/* Name given to default values */
static const char *DEFAULT_VALUE_NAME = "@";
/* 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 (const char *path)
{
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;
debug_printf ("exists (%s)", path);
path += proc_len + 1 + registry_len;
while (SLASH_P (*path))
path++;
if (*path == 0)
{
file_type = 2;
goto out;
}
pathlen = strlen (path);
file = path + pathlen - 1;
if (SLASH_P (*file) && pathlen > 1)
file--;
while (!SLASH_P (*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, 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 (get_name ());
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;
}
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);
dir->__d_u.__d_data.__handle = handle;;
}
if (dir->__d_u.__d_data.__handle == INVALID_HANDLE_VALUE)
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,
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;
if (error != ERROR_NO_MORE_ITEMS)
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) (%s)", &dir->__d_dirent, dir, buf);
return res;
}
__off64_t
fhandler_registry::telldir (DIR * dir)
{
return dir->__d_position & REG_ENUM_VALUES_MASK;
}
void
fhandler_registry::seekdir (DIR * dir, __off32_t loc)
{
/* Unfortunately cannot simply set __d_position due to transition from sub-keys to
* values.
*/
rewinddir (dir);
while (loc > dir->__d_position)
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)
{
DWORD type, size;
LONG error;
HKEY hKey = (HKEY) INVALID_HANDLE_VALUE;
int pathlen;
const char *file;
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 ((mode & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
{
set_errno (EEXIST);
res = 0;
goto out;
}
else if (mode & O_WRONLY)
{
set_errno (EISDIR);
res = 0;
goto out;
}
else
{
flags |= O_DIROPEN;
goto success;
}
}
path++;
pathlen = strlen (path);
file = path + pathlen - 1;
if (SLASH_P (*file) && pathlen > 1)
file--;
while (!SLASH_P (*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 ((mode & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
{
set_errno (EEXIST);
res = 0;
goto out;
}
else if (mode & O_WRONLY)
{
set_errno (EISDIR);
res = 0;
goto out;
}
else
{
flags |= O_DIROPEN;
goto success;
}
}
if ((mode & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
{
set_errno (EROFS);
res = 0;
goto out;
}
else
{
set_errno (ENOENT);
res = 0;
goto out;
}
}
hKey = open_key (path, KEY_READ, true);
if (hKey == (HKEY) INVALID_HANDLE_VALUE)
{
res = 0;
goto out;
}
if (mode & O_WRONLY)
{
set_errno (EROFS);
res = 0;
goto out;
}
if (pathmatch (file, DEFAULT_VALUE_NAME))
file = "";
if (hKey != HKEY_PERFORMANCE_DATA)
{
error = RegQueryValueEx (hKey, file, NULL, &type, NULL, &size);
if (error != ERROR_SUCCESS)
{
seterrno_from_win_error (__FILE__, __LINE__, error);
res = -1;
goto out;
}
bufalloc = size;
filebuf = new char[bufalloc];
error =
RegQueryValueEx (hKey, file, NULL, NULL, (BYTE *) filebuf, &size);
if (error != ERROR_SUCCESS)
{
seterrno_from_win_error (__FILE__, __LINE__, error);
res = 0;
goto out;
}
filesize = size;
}
else
{
bufalloc = 0;
do
{
bufalloc += 1000;
if (filebuf)
{
delete filebuf;
filebuf = new char[bufalloc];
}
error =
RegQueryValueEx (hKey, file, NULL, &type, (BYTE *) filebuf,
&size);
if (error != ERROR_SUCCESS && res != ERROR_MORE_DATA)
{
seterrno_from_win_error (__FILE__, __LINE__, error);
res = 0;
goto out;
}
}
while (error == ERROR_MORE_DATA);
filesize = size;
}
if (flags & O_APPEND)
position = filesize;
else
position = 0;
success:
res = 1;
set_open_status ();
set_flags (flags);
out:
if (hKey != (HKEY) INVALID_HANDLE_VALUE)
RegCloseKey (hKey);
syscall_printf ("%d = fhandler_registry::open (%p, %d)", res, flags, mode);
return res;
}
/* Auxillary member function to open registry keys. */
HKEY
fhandler_registry::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 && !SLASH_P (*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)
{
hKey = (HKEY) INVALID_HANDLE_VALUE;
LONG error = RegOpenKeyEx (hParentKey, component, 0, access, &hKey);
if (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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