/* 
 *  Unix SMB/CIFS implementation.
 *  RPC Pipe client / server routines
 *  Copyright (C) Andrew Tridgell               1992-1997.
 *  Copyright (C) Luke Kenneth Casson Leighton  1996-1997.
 *  Copyright (C) Paul Ashton                        1997.
 *  Copyright (C) Jeremy Allison                     2001.
 *  Copyright (C) Gerald Carter                      2002-2005.
 *
 *  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; either version 2 of the License, or
 *  (at your option) any later version.
 *  
 *  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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

/* Implementation of registry functions. */

#include "includes.h"
#include "regfio.h"

#undef DBGC_CLASS
#define DBGC_CLASS DBGC_RPC_SRV

#define REGSTR_PRODUCTTYPE		"ProductType"
#define REG_PT_WINNT			"WinNT"
#define REG_PT_LANMANNT			"LanmanNT"
#define REG_PT_SERVERNT			"ServerNT"

#define OUR_HANDLE(hnd) (((hnd)==NULL)?"NULL":(IVAL((hnd)->data5,4)==(uint32)sys_getpid()?"OURS":"OTHER")), \
((unsigned int)IVAL((hnd)->data5,4)),((unsigned int)sys_getpid())


/* no idea if this is correct, just use the file access bits for now */

struct generic_mapping reg_map = { REG_KEY_READ, REG_KEY_WRITE, REG_KEY_EXECUTE, REG_KEY_ALL };

/******************************************************************
 free() function for REGISTRY_KEY
 *****************************************************************/
 
static void free_regkey_info(void *ptr)
{
	REGISTRY_KEY *info = (REGISTRY_KEY*)ptr;
	
	SAFE_FREE(info);
}

/******************************************************************
 Find a registry key handle and return a REGISTRY_KEY
 *****************************************************************/

static REGISTRY_KEY *find_regkey_index_by_hnd(pipes_struct *p, POLICY_HND *hnd)
{
	REGISTRY_KEY *regkey = NULL;

	if(!find_policy_by_hnd(p,hnd,(void **)&regkey)) {
		DEBUG(2,("find_regkey_index_by_hnd: Registry Key not found: "));
		return NULL;
	}

	return regkey;
}


/*******************************************************************
 Function for open a new registry handle and creating a handle 
 Note that P should be valid & hnd should already have space
 
 When we open a key, we store the full path to the key as 
 HK[LM|U]\<key>\<key>\...
 *******************************************************************/
 
static WERROR open_registry_key(pipes_struct *p, POLICY_HND *hnd, REGISTRY_KEY *parent,
				const char *subkeyname, uint32 access_granted  )
{
	REGISTRY_KEY 	*regkey = NULL;
	WERROR     	result = WERR_OK;
	REGSUBKEY_CTR	subkeys;
	pstring		subkeyname2;
	int		subkey_len;
	
	DEBUG(7,("open_registry_key: name = [%s][%s]\n", 
		parent ? parent->name : "NULL", subkeyname));

	/* strip any trailing '\'s */
	pstrcpy( subkeyname2, subkeyname );
	subkey_len = strlen ( subkeyname2 );
	if ( subkey_len && subkeyname2[subkey_len-1] == '\\' )
		subkeyname2[subkey_len-1] = '\0';

	if ((regkey=SMB_MALLOC_P(REGISTRY_KEY)) == NULL)
		return WERR_NOMEM;
		
	ZERO_STRUCTP( regkey );
	
	/* 
	 * very crazy, but regedit.exe on Win2k will attempt to call 
	 * REG_OPEN_ENTRY with a keyname of "".  We should return a new 
	 * (second) handle here on the key->name.  regedt32.exe does 
	 * not do this stupidity.   --jerry
	 */
	
	if ( !subkey_len ) {
		pstrcpy( regkey->name, parent->name );	
	}
	else {
		pstrcpy( regkey->name, "" );
		if ( parent ) {
			pstrcat( regkey->name, parent->name );
			pstrcat( regkey->name, "\\" );
		}
		pstrcat( regkey->name, subkeyname2 );
	}
	
	/* Look up the table of registry I/O operations */

	if ( !(regkey->hook = reghook_cache_find( regkey->name )) ) {
		DEBUG(0,("open_registry_key: Failed to assigned a REGISTRY_HOOK to [%s]\n",
			regkey->name ));
		return WERR_BADFILE;
	}
	
	/* check if the path really exists; failed is indicated by -1 */
	/* if the subkey count failed, bail out */

	ZERO_STRUCTP( &subkeys );
	
	regsubkey_ctr_init( &subkeys );
	
	if ( fetch_reg_keys( regkey, &subkeys ) == -1 )  {
	
		/* don't really know what to return here */
		result = WERR_BADFILE;
	}
	else {
		/* 
		 * This would previously return NT_STATUS_TOO_MANY_SECRETS
		 * that doesn't sound quite right to me  --jerry
		 */
		
		if ( !create_policy_hnd( p, hnd, free_regkey_info, regkey ) )
			result = WERR_BADFILE; 
	}
	
	/* clean up */

	regsubkey_ctr_destroy( &subkeys );
	
	if ( ! NT_STATUS_IS_OK(result) )
		SAFE_FREE( regkey );
	
	DEBUG(7,("open_registry_key: exit\n"));

	return result;
}

/*******************************************************************
 Function for open a new registry handle and creating a handle 
 Note that P should be valid & hnd should already have space
 *******************************************************************/

static BOOL close_registry_key(pipes_struct *p, POLICY_HND *hnd)
{
	REGISTRY_KEY *regkey = find_regkey_index_by_hnd(p, hnd);
	
	if ( !regkey ) {
		DEBUG(2,("close_registry_key: Invalid handle (%s:%u:%u)\n", OUR_HANDLE(hnd)));
		return False;
	}
	
	close_policy_hnd(p, hnd);
	
	return True;
}

/********************************************************************
 retrieve information about the subkeys
 *******************************************************************/
 
static BOOL get_subkey_information( REGISTRY_KEY *key, uint32 *maxnum, uint32 *maxlen )
{
	int 		num_subkeys, i;
	uint32 		max_len;
	REGSUBKEY_CTR 	subkeys;
	uint32 		len;
	
	if ( !key )
		return False;

	ZERO_STRUCTP( &subkeys );
	
	regsubkey_ctr_init( &subkeys );	
	   
	if ( fetch_reg_keys( key, &subkeys ) == -1 )
		return False;

	/* find the longest string */
	
	max_len = 0;
	num_subkeys = regsubkey_ctr_numkeys( &subkeys );
	
	for ( i=0; i<num_subkeys; i++ ) {
		len = strlen( regsubkey_ctr_specific_key(&subkeys, i) );
		max_len = MAX(max_len, len);
	}

	*maxnum = num_subkeys;
	*maxlen = max_len*2;
	
	regsubkey_ctr_destroy( &subkeys );
	
	return True;
}

/********************************************************************
 retrieve information about the values.  We don't store values 
 here.  The registry tdb is intended to be a frontend to oether 
 Samba tdb's (such as ntdrivers.tdb).
 *******************************************************************/
 
static BOOL get_value_information( REGISTRY_KEY *key, uint32 *maxnum, 
                                    uint32 *maxlen, uint32 *maxsize )
{
	REGVAL_CTR 	values;
	REGISTRY_VALUE	*val;
	uint32 		sizemax, lenmax;
	int 		i, num_values;
	
	if ( !key )
		return False;


	ZERO_STRUCTP( &values );
	
	regval_ctr_init( &values );
	
	if ( fetch_reg_values( key, &values ) == -1 )
		return False;
	
	lenmax = sizemax = 0;
	num_values = regval_ctr_numvals( &values );
	
	val = regval_ctr_specific_value( &values, 0 );
	
	for ( i=0; i<num_values && val; i++ ) 
	{
		lenmax  = MAX(lenmax,  strlen(val->valuename)+1 );
		sizemax = MAX(sizemax, val->size );
		
		val = regval_ctr_specific_value( &values, i );
	}

	*maxnum   = num_values;
	*maxlen   = lenmax;
	*maxsize  = sizemax;
	
	regval_ctr_destroy( &values );
	
	return True;
}


/********************************************************************
 reg_close
 ********************************************************************/

WERROR _reg_close(pipes_struct *p, REG_Q_CLOSE *q_u, REG_R_CLOSE *r_u)
{
	/* set up the REG unknown_1 response */
	ZERO_STRUCT(r_u->pol);

	/* close the policy handle */
	if (!close_registry_key(p, &q_u->pol))
		return WERR_BADFID; /* This will be reported as an RPC fault anyway. */

	return WERR_OK;
}

/*******************************************************************
 ********************************************************************/

WERROR _reg_open_hklm(pipes_struct *p, REG_Q_OPEN_HIVE *q_u, REG_R_OPEN_HIVE *r_u)
{
	return open_registry_key( p, &r_u->pol, NULL, KEY_HKLM, 0x0 );
}

/*******************************************************************
 ********************************************************************/

WERROR _reg_open_hkcr(pipes_struct *p, REG_Q_OPEN_HIVE *q_u, REG_R_OPEN_HIVE *r_u)
{
	return open_registry_key( p, &r_u->pol, NULL, KEY_HKCR, 0x0 );
}

/*******************************************************************
 ********************************************************************/

WERROR _reg_open_hku(pipes_struct *p, REG_Q_OPEN_HIVE *q_u, REG_R_OPEN_HIVE *r_u)
{
	return open_registry_key( p, &r_u->pol, NULL, KEY_HKU, 0x0 );
}

/*******************************************************************
 reg_reply_open_entry
 ********************************************************************/

WERROR _reg_open_entry(pipes_struct *p, REG_Q_OPEN_ENTRY *q_u, REG_R_OPEN_ENTRY *r_u)
{
	POLICY_HND pol;
	fstring name;
	REGISTRY_KEY *key = find_regkey_index_by_hnd(p, &q_u->pol);
	WERROR result;

	DEBUG(5,("reg_open_entry: Enter\n"));

	if ( !key )
		return WERR_BADFID; /* This will be reported as an RPC fault anyway. */

	rpcstr_pull( name, q_u->name.string->buffer, sizeof(name), q_u->name.string->uni_str_len*2, 0 );
	
	result = open_registry_key( p, &pol, key, name, 0x0 );
	
	init_reg_r_open_entry( r_u, &pol, result );

	DEBUG(5,("reg_open_entry: Exit\n"));

	return r_u->status;
}

/*******************************************************************
 reg_reply_info
 ********************************************************************/

WERROR _reg_info(pipes_struct *p, REG_Q_INFO *q_u, REG_R_INFO *r_u)
{
	WERROR			status = WERR_BADFILE;
	fstring 		name;
	const char              *value_ascii = "";
	fstring                 value;
	int                     value_length;
	REGISTRY_KEY 		*regkey = find_regkey_index_by_hnd( p, &q_u->pol );
	REGISTRY_VALUE		*val = NULL;
	REGVAL_CTR		regvals;
	int			i;

	DEBUG(5,("_reg_info: Enter\n"));

	if ( !regkey )
		return WERR_BADFID; /* This will be reported as an RPC fault anyway. */
		
	DEBUG(7,("_reg_info: policy key name = [%s]\n", regkey->name));
	
	rpcstr_pull(name, q_u->name.string->buffer, sizeof(name), q_u->name.string->uni_str_len*2, 0);

	DEBUG(5,("reg_info: looking up value: [%s]\n", name));

	ZERO_STRUCTP( &regvals );
	
	regval_ctr_init( &regvals );

	/* couple of hard coded registry values */
	
	if ( strequal(name, "RefusePasswordChange") ) {
		uint32 dwValue;

		if ( (val = SMB_MALLOC_P(REGISTRY_VALUE)) == NULL ) {
			DEBUG(0,("_reg_info: malloc() failed!\n"));
			return WERR_NOMEM;
		}

		if (!account_policy_get(AP_REFUSE_MACHINE_PW_CHANGE, &dwValue))
			dwValue = 0;
		regval_ctr_addvalue(&regvals, "RefusePasswordChange", 
				    REG_DWORD,
				    (const char*)&dwValue, sizeof(dwValue));
		val = dup_registry_value(
			regval_ctr_specific_value( &regvals, 0 ) );
 	
		status = WERR_OK;
	
		goto out;
	}

	if ( strequal(name, REGSTR_PRODUCTTYPE) ) {
		/* This makes the server look like a member server to clients */
		/* which tells clients that we have our own local user and    */
		/* group databases and helps with ACL support.                */
		
		switch (lp_server_role()) {
			case ROLE_DOMAIN_PDC:
			case ROLE_DOMAIN_BDC:
				value_ascii = REG_PT_LANMANNT;
				break;
			case ROLE_STANDALONE:
				value_ascii = REG_PT_SERVERNT;
				break;
			case ROLE_DOMAIN_MEMBER:
				value_ascii = REG_PT_WINNT;
				break;
		}
		value_length = push_ucs2(value, value, value_ascii,
					 sizeof(value),
					 STR_TERMINATE|STR_NOALIGN);
		regval_ctr_addvalue(&regvals, REGSTR_PRODUCTTYPE, REG_SZ,
				    value, value_length);
		
		val = dup_registry_value( regval_ctr_specific_value( &regvals, 0 ) );
		
		status = WERR_OK;
		
		goto out;
	}

	/* else fall back to actually looking up the value */
	
	for ( i=0; fetch_reg_values_specific(regkey, &val, i); i++ ) 
	{
		DEBUG(10,("_reg_info: Testing value [%s]\n", val->valuename));
		if ( StrCaseCmp( val->valuename, name ) == 0 ) {
			DEBUG(10,("_reg_info: Found match for value [%s]\n", name));
			status = WERR_OK;
			break;
		}
		
		free_registry_value( val );
	}

  
out:
	init_reg_r_info(q_u->ptr_buf, r_u, val, status);
	
	regval_ctr_destroy( &regvals );
	free_registry_value( val );

	DEBUG(5,("_reg_info: Exit\n"));

	return status;
}


/*****************************************************************************
 Implementation of REG_QUERY_KEY
 ****************************************************************************/
 
WERROR _reg_query_key(pipes_struct *p, REG_Q_QUERY_KEY *q_u, REG_R_QUERY_KEY *r_u)
{
	WERROR 	status = WERR_OK;
	REGISTRY_KEY	*regkey = find_regkey_index_by_hnd( p, &q_u->pol );
	
	DEBUG(5,("_reg_query_key: Enter\n"));
	
	if ( !regkey )
		return WERR_BADFID; /* This will be reported as an RPC fault anyway. */
	
	if ( !get_subkey_information( regkey, &r_u->num_subkeys, &r_u->max_subkeylen ) )
		return WERR_ACCESS_DENIED;
		
	if ( !get_value_information( regkey, &r_u->num_values, &r_u->max_valnamelen, &r_u->max_valbufsize ) )
		return WERR_ACCESS_DENIED;	

		
	r_u->sec_desc = 0x00000078;	/* size for key's sec_desc */
	
	/* Win9x set this to 0x0 since it does not keep timestamps.
	   Doing the same here for simplicity   --jerry */
	   
	ZERO_STRUCT(r_u->mod_time);	

	DEBUG(5,("_reg_query_key: Exit\n"));
	
	return status;
}


/*****************************************************************************
 Implementation of REG_GETVERSION
 ****************************************************************************/
 
WERROR _reg_getversion(pipes_struct *p, REG_Q_GETVERSION *q_u, REG_R_GETVERSION *r_u)
{
	WERROR 	status = WERR_OK;
	REGISTRY_KEY	*regkey = find_regkey_index_by_hnd( p, &q_u->pol );
	
	DEBUG(5,("_reg_getversion: Enter\n"));
	
	if ( !regkey )
		return WERR_BADFID; /* This will be reported as an RPC fault anyway. */
	
	r_u->unknown = 0x00000005;	/* seems to be consistent...no idea what it means */
	
	DEBUG(5,("_reg_getversion: Exit\n"));
	
	return status;
}


/*****************************************************************************
 Implementation of REG_ENUM_KEY
 ****************************************************************************/
 
WERROR _reg_enum_key(pipes_struct *p, REG_Q_ENUM_KEY *q_u, REG_R_ENUM_KEY *r_u)
{
	WERROR 	status = WERR_OK;
	REGISTRY_KEY	*regkey = find_regkey_index_by_hnd( p, &q_u->pol );
	char		*subkey = NULL;
	
	
	DEBUG(5,("_reg_enum_key: Enter\n"));
	
	if ( !regkey )
		return WERR_BADFID; /* This will be reported as an RPC fault anyway. */

	DEBUG(8,("_reg_enum_key: enumerating key [%s]\n", regkey->name));
	
	if ( !fetch_reg_keys_specific( regkey, &subkey, q_u->key_index ) )
	{
		status = WERR_NO_MORE_ITEMS;
		goto done;
	}
	
	DEBUG(10,("_reg_enum_key: retrieved subkey named [%s]\n", subkey));
	
	/* subkey has the string name now */
	
	init_reg_r_enum_key( r_u, subkey );
	
	DEBUG(5,("_reg_enum_key: Exit\n"));
	
done:	
	SAFE_FREE( subkey );
	return status;
}

/*****************************************************************************
 Implementation of REG_ENUM_VALUE
 ****************************************************************************/
 
WERROR _reg_enum_value(pipes_struct *p, REG_Q_ENUM_VALUE *q_u, REG_R_ENUM_VALUE *r_u)
{
	WERROR 	status = WERR_OK;
	REGISTRY_KEY	*regkey = find_regkey_index_by_hnd( p, &q_u->pol );
	REGISTRY_VALUE	*val;
	
	
	DEBUG(5,("_reg_enum_value: Enter\n"));
	
	if ( !regkey )
		return WERR_BADFID; /* This will be reported as an RPC fault anyway. */

	DEBUG(8,("_reg_enum_key: enumerating values for key [%s]\n", regkey->name));

	if ( !fetch_reg_values_specific( regkey, &val, q_u->val_index ) ) {
		status = WERR_NO_MORE_ITEMS;
		goto done;
	}
	
	DEBUG(10,("_reg_enum_value: retrieved value named  [%s]\n", val->valuename));
	
	/* subkey has the string name now */
	
	init_reg_r_enum_val( r_u, val );


	DEBUG(5,("_reg_enum_value: Exit\n"));
	
done:	
	free_registry_value( val );
	
	return status;
}


/*******************************************************************
 reg_shutdwon
 ********************************************************************/

WERROR _reg_shutdown(pipes_struct *p, REG_Q_SHUTDOWN *q_u, REG_R_SHUTDOWN *r_u)
{
	REG_Q_SHUTDOWN_EX q_u_ex;
	REG_R_SHUTDOWN_EX r_u_ex;
	
	/* copy fields (including stealing memory) */
	
	q_u_ex.server  = q_u->server;
	q_u_ex.message = q_u->message;
	q_u_ex.timeout = q_u->timeout;
	q_u_ex.force   = q_u->force;
	q_u_ex.reboot  = q_u->reboot;
	q_u_ex.reason  = 0x0; 	/* don't care for now */
	
	/* thunk down to _reg_shutdown_ex() (just returns a status) */
	
	return _reg_shutdown_ex( p, &q_u_ex, &r_u_ex );
}

/*******************************************************************
 reg_shutdown_ex
 ********************************************************************/

#define SHUTDOWN_R_STRING "-r"
#define SHUTDOWN_F_STRING "-f"


WERROR _reg_shutdown_ex(pipes_struct *p, REG_Q_SHUTDOWN_EX *q_u, REG_R_SHUTDOWN_EX *r_u)
{
	pstring shutdown_script;
	pstring message;
	pstring chkmsg;
	fstring timeout;
	fstring reason;
	fstring r;
	fstring f;
	int ret;
	BOOL can_shutdown;
	

 	pstrcpy(shutdown_script, lp_shutdown_script());
	
	if ( !*shutdown_script )
		return WERR_ACCESS_DENIED;

	/* pull the message string and perform necessary sanity checks on it */

	pstrcpy( message, "" );
	if ( q_u->message ) {
		UNISTR2 *msg_string = q_u->message->string;
		
		rpcstr_pull( message, msg_string->buffer, sizeof(message), msg_string->uni_str_len*2, 0 );
	}
	alpha_strcpy (chkmsg, message, NULL, sizeof(message));
		
	fstr_sprintf(timeout, "%d", q_u->timeout);
	fstr_sprintf(r, (q_u->reboot) ? SHUTDOWN_R_STRING : "");
	fstr_sprintf(f, (q_u->force) ? SHUTDOWN_F_STRING : "");
	fstr_sprintf( reason, "%d", q_u->reason );

	all_string_sub( shutdown_script, "%z", chkmsg, sizeof(shutdown_script) );
	all_string_sub( shutdown_script, "%t", timeout, sizeof(shutdown_script) );
	all_string_sub( shutdown_script, "%r", r, sizeof(shutdown_script) );
	all_string_sub( shutdown_script, "%f", f, sizeof(shutdown_script) );
	all_string_sub( shutdown_script, "%x", reason, sizeof(shutdown_script) );

	can_shutdown = user_has_privileges( p->pipe_user.nt_user_token, &se_remote_shutdown );
		
	/* IF someone has privs, run the shutdown script as root. OTHERWISE run it as not root
	   Take the error return from the script and provide it as the Windows return code. */
	   
	/********** BEGIN SeRemoteShutdownPrivilege BLOCK **********/
	
	if ( can_shutdown ) 
		become_root();

	ret = smbrun( shutdown_script, NULL );
		
	if ( can_shutdown )
		unbecome_root();

	/********** END SeRemoteShutdownPrivilege BLOCK **********/
	
	DEBUG(3,("_reg_shutdown_ex: Running the command `%s' gave %d\n",
		shutdown_script, ret));
		

	return (ret == 0) ? WERR_OK : WERR_ACCESS_DENIED;
}




/*******************************************************************
 reg_abort_shutdwon
 ********************************************************************/

WERROR _reg_abort_shutdown(pipes_struct *p, REG_Q_ABORT_SHUTDOWN *q_u, REG_R_ABORT_SHUTDOWN *r_u)
{
	pstring abort_shutdown_script;
	int ret;
	BOOL can_shutdown;

	pstrcpy(abort_shutdown_script, lp_abort_shutdown_script());

	if ( !*abort_shutdown_script )
		return WERR_ACCESS_DENIED;
		
	can_shutdown = user_has_privileges( p->pipe_user.nt_user_token, &se_remote_shutdown );
		
	/********** BEGIN SeRemoteShutdownPrivilege BLOCK **********/
	
	if ( can_shutdown )
		become_root();
		
	ret = smbrun( abort_shutdown_script, NULL );
	
	if ( can_shutdown )
		unbecome_root();
		
	/********** END SeRemoteShutdownPrivilege BLOCK **********/

	DEBUG(3,("_reg_abort_shutdown: Running the command `%s' gave %d\n",
		abort_shutdown_script, ret));
		

	return (ret == 0) ? WERR_OK : WERR_ACCESS_DENIED;
}

/*******************************************************************
 ********************************************************************/

static int validate_reg_filename( pstring fname )
{
	char *p;
	int num_services = lp_numservices();
	int snum;
	pstring share_path;
	pstring unix_fname;
	
	/* convert to a unix path, stripping the C:\ along the way */
	
	if ( !(p = valid_share_pathname( fname ) ))
		return -1;

	/* has to exist within a valid file share */
			
	for ( snum=0; snum<num_services; snum++ ) {
	
		if ( !lp_snum_ok(snum) || lp_print_ok(snum) )
			continue;
		
		pstrcpy( share_path, lp_pathname(snum) );

		/* make sure we have a path (e.g. [homes] ) */

		if ( strlen( share_path ) == 0 )
			continue;

		if ( strncmp( share_path, p, strlen( share_path )) == 0 )
			break;
	}
	
	/* p and fname are overlapping memory so copy out and back in again */
	
	pstrcpy( unix_fname, p );
	pstrcpy( fname, unix_fname );
	
	return (snum < num_services) ? snum : -1;
}

/*******************************************************************
 Note: topkeypaty is the *full* path that this *key will be 
 loaded into (including the name of the key)
 ********************************************************************/

static WERROR reg_load_tree( REGF_FILE *regfile, const char *topkeypath,
                             REGF_NK_REC *key )
{
	REGF_NK_REC *subkey;
	REGISTRY_KEY registry_key;
	REGVAL_CTR values;
	REGSUBKEY_CTR subkeys;
	int i;
	pstring path;
	WERROR result = WERR_OK;
	
	/* initialize the REGISTRY_KEY structure */
	
	if ( !(registry_key.hook = reghook_cache_find(topkeypath)) ) {
		DEBUG(0,("reg_load_tree: Failed to assigned a REGISTRY_HOOK to [%s]\n",
			topkeypath ));
		return WERR_BADFILE;
	}
	pstrcpy( registry_key.name, topkeypath );
	
	/* now start parsing the values and subkeys */

	ZERO_STRUCT( values );
	ZERO_STRUCT( subkeys );

	regsubkey_ctr_init( &subkeys );
	regval_ctr_init( &values );
	
	/* copy values into the REGVAL_CTR */
	
	for ( i=0; i<key->num_values; i++ ) {
		regval_ctr_addvalue( &values, key->values[i].valuename, key->values[i].type,
			key->values[i].data, (key->values[i].data_size & ~VK_DATA_IN_OFFSET) );
	}

	/* copy subkeys into the REGSUBKEY_CTR */
	
	key->subkey_index = 0;
	while ( (subkey = regfio_fetch_subkey( regfile, key )) ) {
		regsubkey_ctr_addkey( &subkeys, subkey->keyname );
	}
	
	/* write this key and values out */
	
	if ( !store_reg_values( &registry_key, &values ) 
		|| !store_reg_keys( &registry_key, &subkeys ) )
	{
		DEBUG(0,("reg_load_tree: Failed to load %s!\n", topkeypath));
		result = WERR_REG_IO_FAILURE;
	}
	
	regval_ctr_destroy( &values );
	regsubkey_ctr_destroy( &subkeys );
	
	if ( !W_ERROR_IS_OK(result) )
		return result;
	
	/* now continue to load each subkey registry tree */

	key->subkey_index = 0;
	while ( (subkey = regfio_fetch_subkey( regfile, key )) ) {
		pstr_sprintf( path, "%s%s%s", topkeypath, "\\", subkey->keyname );
		result = reg_load_tree( regfile, path, subkey );
		if ( !W_ERROR_IS_OK(result) )
			break;
	}

	return result;
}

/*******************************************************************
 ********************************************************************/

static WERROR restore_registry_key ( REGISTRY_KEY *krecord, const char *fname )
{
	REGF_FILE *regfile;
	REGF_NK_REC *rootkey;
	WERROR result;
		
	/* open the registry file....fail if the file already exists */
	
	if ( !(regfile = regfio_open( fname, (O_RDONLY), 0 )) ) {
                DEBUG(0,("backup_registry_key: failed to open \"%s\" (%s)\n", 
			fname, strerror(errno) ));
		return ( ntstatus_to_werror(map_nt_error_from_unix( errno )) );
        }
	
	/* get the rootkey from the regf file and then load the tree
	   via recursive calls */
	   
	if ( !(rootkey = regfio_rootkey( regfile )) )
		return WERR_REG_FILE_INVALID;
	
	result = reg_load_tree( regfile, krecord->name, rootkey );
		
	/* cleanup */
	
	regfio_close( regfile );
	
	return result;
}

/*******************************************************************
 ********************************************************************/

WERROR _reg_restore_key(pipes_struct *p, REG_Q_RESTORE_KEY  *q_u, REG_R_RESTORE_KEY *r_u)
{
	REGISTRY_KEY	*regkey = find_regkey_index_by_hnd( p, &q_u->pol );
	pstring         filename;
	int             snum;
	
	DEBUG(5,("_reg_restore_key: Enter\n"));
	
	if ( !regkey )
		return WERR_BADFID; 

	rpcstr_pull(filename, q_u->filename.string->buffer, sizeof(filename), q_u->filename.string->uni_str_len*2, STR_TERMINATE);

	DEBUG(8,("_reg_restore_key: verifying restore of key [%s] from \"%s\"\n", regkey->name, filename));

	if ( (snum = validate_reg_filename( filename )) == -1 )
		return WERR_OBJECT_PATH_INVALID;
		
	/* user must posses SeRestorePrivilege for this this proceed */
	
	if ( !user_has_privileges( p->pipe_user.nt_user_token, &se_restore ) )
		return WERR_ACCESS_DENIED;
		
	DEBUG(2,("_reg_restore_key: Restoring [%s] from %s in share %s\n", regkey->name, filename, lp_servicename(snum) ));

	return restore_registry_key( regkey, filename );
}

/********************************************************************
********************************************************************/

static WERROR reg_write_tree( REGF_FILE *regfile, const char *keypath,
                              REGF_NK_REC *parent, SEC_DESC *sec_desc )
{
	REGF_NK_REC *key;
	REGVAL_CTR values;
	REGSUBKEY_CTR subkeys;
	int i, num_subkeys;
	pstring key_tmp;
	char *keyname, *parentpath;
	pstring subkeypath;
	char *subkeyname;
	REGISTRY_KEY registry_key;
	WERROR result = WERR_OK;
	
	if ( !regfile )
		return WERR_GENERAL_FAILURE;
		
	if ( !keypath )
		return WERR_OBJECT_PATH_INVALID;
		
	/* split up the registry key path */
	
	pstrcpy( key_tmp, keypath );
	if ( !reg_split_key( key_tmp, &parentpath, &keyname ) )
		return WERR_OBJECT_PATH_INVALID;

	if ( !keyname )
		keyname = parentpath;

	/* we need a REGISTRY_KEY object here to enumerate subkeys and values */
	
	ZERO_STRUCT( registry_key );
	pstrcpy( registry_key.name, keypath );
	if ( !(registry_key.hook = reghook_cache_find( registry_key.name )) )
		return WERR_BADFILE;

	
	/* lookup the values and subkeys */
	
	ZERO_STRUCT( values );
	ZERO_STRUCT( subkeys );
	
	regsubkey_ctr_init( &subkeys );
	regval_ctr_init( &values );
	
	fetch_reg_keys( &registry_key, &subkeys );
	fetch_reg_values( &registry_key, &values );

	/* write out this key */
		
	if ( !(key = regfio_write_key( regfile, keyname, &values, &subkeys, sec_desc, parent )) ) {
		result = WERR_CAN_NOT_COMPLETE;
		goto done;
	}

	/* write each one of the subkeys out */

	num_subkeys = regsubkey_ctr_numkeys( &subkeys );
	for ( i=0; i<num_subkeys; i++ ) {
		subkeyname = regsubkey_ctr_specific_key( &subkeys, i );
		pstr_sprintf( subkeypath, "%s\\%s", keypath, subkeyname );
		result = reg_write_tree( regfile, subkeypath, key, sec_desc );
		if ( !W_ERROR_IS_OK(result) )
			goto done;
	}

	DEBUG(6,("reg_write_tree: wrote key [%s]\n", keypath ));

done:
	regval_ctr_destroy( &values );
	regsubkey_ctr_destroy( &subkeys );

	return result;
}

/*******************************************************************
 ********************************************************************/

static WERROR make_default_reg_sd( TALLOC_CTX *ctx, SEC_DESC **psd )
{
	DOM_SID adm_sid, owner_sid;
	SEC_ACE ace[2];         /* at most 2 entries */
	SEC_ACCESS mask;
	SEC_ACL *psa = NULL;
	uint32 sd_size;

	/* set the owner to BUILTIN\Administrator */

	sid_copy(&owner_sid, &global_sid_Builtin);
	sid_append_rid(&owner_sid, DOMAIN_USER_RID_ADMIN );
	

	/* basic access for Everyone */

	init_sec_access(&mask, reg_map.generic_execute | reg_map.generic_read );
	init_sec_ace(&ace[0], &global_sid_World, SEC_ACE_TYPE_ACCESS_ALLOWED, mask, 0);

	/* add Full Access 'BUILTIN\Administrators' */

	init_sec_access(&mask, reg_map.generic_all);
	sid_copy(&adm_sid, &global_sid_Builtin);
	sid_append_rid(&adm_sid, BUILTIN_ALIAS_RID_ADMINS);
	init_sec_ace(&ace[1], &adm_sid, SEC_ACE_TYPE_ACCESS_ALLOWED, mask, 0);

        /* create the security descriptor */

        if ((psa = make_sec_acl(ctx, NT4_ACL_REVISION, 2, ace)) == NULL)
                return WERR_NOMEM;

        if ((*psd = make_sec_desc(ctx, SEC_DESC_REVISION, SEC_DESC_SELF_RELATIVE, &owner_sid, NULL, NULL, psa, &sd_size)) == NULL)
                return WERR_NOMEM;

	return WERR_OK;
}

/*******************************************************************
 ********************************************************************/

static WERROR backup_registry_key ( REGISTRY_KEY *krecord, const char *fname )
{
	REGF_FILE *regfile;
	WERROR result;
	SEC_DESC *sd = NULL;
	
	/* open the registry file....fail if the file already exists */
	
	if ( !(regfile = regfio_open( fname, (O_RDWR|O_CREAT|O_EXCL), (S_IREAD|S_IWRITE) )) ) {
                DEBUG(0,("backup_registry_key: failed to open \"%s\" (%s)\n", 
			fname, strerror(errno) ));
		return ( ntstatus_to_werror(map_nt_error_from_unix( errno )) );
        }
	
	if ( !W_ERROR_IS_OK(result = make_default_reg_sd( regfile->mem_ctx, &sd )) ) {
		regfio_close( regfile );
		return result;
	}
		
	/* write the registry tree to the file  */
	
	result = reg_write_tree( regfile, krecord->name, NULL, sd );
		
	/* cleanup */
	
	regfio_close( regfile );
	
	return result;
}

/*******************************************************************
 ********************************************************************/

WERROR _reg_save_key(pipes_struct *p, REG_Q_SAVE_KEY  *q_u, REG_R_SAVE_KEY *r_u)
{
	REGISTRY_KEY	*regkey = find_regkey_index_by_hnd( p, &q_u->pol );
	pstring         filename;
	int             snum;
	
	DEBUG(5,("_reg_save_key: Enter\n"));
		 
	if ( !regkey )
		return WERR_BADFID; 

	rpcstr_pull(filename, q_u->filename.string->buffer, sizeof(filename), q_u->filename.string->uni_str_len*2, STR_TERMINATE);

	DEBUG(8,("_reg_save_key: verifying backup of key [%s] to \"%s\"\n", regkey->name, filename));
	
	if ( (snum = validate_reg_filename( filename )) == -1 )
		return WERR_OBJECT_PATH_INVALID;
		
	DEBUG(2,("_reg_save_key: Saving [%s] to %s in share %s\n", regkey->name, filename, lp_servicename(snum) ));
		
	return backup_registry_key( regkey, filename );

	return WERR_OK;
}