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/* w32reg.c - MS-Windows Registry access
* Copyright (C) 1999, 2002, 2005 Free Software Foundation, Inc.
*
* This file is part of GnuPG.
*
* GnuPG 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; either version 2 of the License, or
* (at your option) any later version.
*
* GnuPG 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 <config.h>
#if defined (_WIN32) || defined (__CYGWIN32__)
/* This module is only used in this environment */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <windows.h>
#include "util.h"
#include "memory.h"
static HKEY
get_root_key(const char *root)
{
HKEY root_key;
if( !root )
root_key = HKEY_CURRENT_USER;
else if( !strcmp( root, "HKEY_CLASSES_ROOT" ) )
root_key = HKEY_CLASSES_ROOT;
else if( !strcmp( root, "HKEY_CURRENT_USER" ) )
root_key = HKEY_CURRENT_USER;
else if( !strcmp( root, "HKEY_LOCAL_MACHINE" ) )
root_key = HKEY_LOCAL_MACHINE;
else if( !strcmp( root, "HKEY_USERS" ) )
root_key = HKEY_USERS;
else if( !strcmp( root, "HKEY_PERFORMANCE_DATA" ) )
root_key = HKEY_PERFORMANCE_DATA;
else if( !strcmp( root, "HKEY_CURRENT_CONFIG" ) )
root_key = HKEY_CURRENT_CONFIG;
else
return NULL;
return root_key;
}
/****************
* Return a string from the Win32 Registry or NULL in case of
* error. Caller must release the return value. A NULL for root
* is an alias for HKEY_CURRENT_USER, HKEY_LOCAL_MACHINE in turn.
* NOTE: The value is allocated with a plain malloc() - use free() and not
* the usual xfree()!!!
*/
char *
read_w32_registry_string( const char *root, const char *dir, const char *name )
{
HKEY root_key, key_handle;
DWORD n1, nbytes, type;
char *result = NULL;
if ( !(root_key = get_root_key(root) ) )
return NULL;
if( RegOpenKeyEx( root_key, dir, 0, KEY_READ, &key_handle ) )
{
if (root)
return NULL; /* no need for a RegClose, so return direct */
/* It seems to be common practise to fall back to HKLM. */
if (RegOpenKeyEx (HKEY_LOCAL_MACHINE, dir, 0, KEY_READ, &key_handle) )
return NULL; /* still no need for a RegClose, so return direct */
}
nbytes = 1;
if( RegQueryValueEx( key_handle, name, 0, NULL, NULL, &nbytes ) ) {
if (root)
goto leave;
/* Try to fallback to HKLM also vor a missing value. */
RegCloseKey (key_handle);
if (RegOpenKeyEx (HKEY_LOCAL_MACHINE, dir, 0, KEY_READ, &key_handle) )
return NULL; /* Nope. */
if (RegQueryValueEx( key_handle, name, 0, NULL, NULL, &nbytes))
goto leave;
}
result = malloc( (n1=nbytes+1) );
if( !result )
goto leave;
if( RegQueryValueEx( key_handle, name, 0, &type, result, &n1 ) ) {
free(result); result = NULL;
goto leave;
}
result[nbytes] = 0; /* make sure it is really a string */
if (type == REG_EXPAND_SZ && strchr (result, '%')) {
char *tmp;
n1 += 1000;
tmp = malloc (n1+1);
if (!tmp)
goto leave;
nbytes = ExpandEnvironmentStrings (result, tmp, n1);
if (nbytes && nbytes > n1) {
free (tmp);
n1 = nbytes;
tmp = malloc (n1 + 1);
if (!tmp)
goto leave;
nbytes = ExpandEnvironmentStrings (result, tmp, n1);
if (nbytes && nbytes > n1) {
free (tmp); /* oops - truncated, better don't expand at all */
goto leave;
}
tmp[nbytes] = 0;
free (result);
result = tmp;
}
else if (nbytes) { /* okay, reduce the length */
tmp[nbytes] = 0;
free (result);
result = malloc (strlen (tmp)+1);
if (!result)
result = tmp;
else {
strcpy (result, tmp);
free (tmp);
}
}
else { /* error - don't expand */
free (tmp);
}
}
leave:
RegCloseKey( key_handle );
return result;
}
int
write_w32_registry_string(const char *root, const char *dir,
const char *name, const char *value)
{
HKEY root_key, reg_key;
if ( !(root_key = get_root_key(root) ) )
return -1;
if ( RegOpenKeyEx( root_key, dir, 0, KEY_WRITE, ®_key )
!= ERROR_SUCCESS )
return -1;
if ( RegSetValueEx( reg_key, name, 0, REG_SZ, (BYTE *)value,
strlen( value ) ) != ERROR_SUCCESS ) {
if ( RegCreateKey( root_key, name, ®_key ) != ERROR_SUCCESS ) {
RegCloseKey(reg_key);
return -1;
}
if ( RegSetValueEx( reg_key, name, 0, REG_SZ, (BYTE *)value,
strlen( value ) ) != ERROR_SUCCESS ) {
RegCloseKey(reg_key);
return -1;
}
}
RegCloseKey( reg_key );
return 0;
}
#endif /* __MINGW32__ || __CYGWIN32__ */
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