reg_db.c

samba-3.0.22.tar.gz 编译smb服务器的源码

	len = 0;
	
	/* store the number of subkeys */
	
	len += tdb_pack(buffer+len, buflen-len, "d", num_subkeys );
	
	/* pack all the strings */
	
	for (i=0; i<num_subkeys; i++) {
		len += tdb_pack( buffer+len, buflen-len, "f", regsubkey_ctr_specific_key(ctr, i) );
		if ( len > buflen ) {
			/* allocate some extra space */
			if ((tmpbuf = SMB_REALLOC( buffer, len*2 )) == NULL) {
				DEBUG(0,("regdb_store_keys: Failed to realloc memory of size [%d]\n", len*2));
				ret = False;
				goto done;
			}
			buffer = tmpbuf;
			buflen = len*2;
					
			len = tdb_pack( buffer+len, buflen-len, "f", regsubkey_ctr_specific_key(ctr, i) );
		}		
	}
	
	/* finally write out the data */
	
	kbuf.dptr = keyname;
	kbuf.dsize = strlen(keyname)+1;
	dbuf.dptr = buffer;
	dbuf.dsize = len;
	if ( tdb_store( tdb_reg, kbuf, dbuf, TDB_REPLACE ) == -1) {
		ret = False;
		goto done;
	}

done:		
	SAFE_FREE( buffer );
	
	return ret;
}

/***********************************************************************
 Store the new subkey record and create any child key records that 
 do not currently exist
 ***********************************************************************/

BOOL regdb_store_keys( const char *key, REGSUBKEY_CTR *ctr )
{
	int num_subkeys, i;
	pstring path;
	REGSUBKEY_CTR *subkeys, *old_subkeys;
	char *oldkeyname;
	
	/* fetch a list of the old subkeys so we can determine if any were deleted */
	
	if ( !(old_subkeys = TALLOC_ZERO_P( ctr, REGSUBKEY_CTR )) ) {
		DEBUG(0,("regdb_store_keys: talloc() failure!\n"));
		return False;
	}

	regdb_fetch_keys( key, old_subkeys );
	
	/* store the subkey list for the parent */
	
	if ( !regdb_store_keys_internal( key, ctr ) ) {
		DEBUG(0,("regdb_store_keys: Failed to store new subkey list for parent [%s}\n", key ));
		return False;
	}
	
	/* now delete removed keys */
	
	num_subkeys = regsubkey_ctr_numkeys( old_subkeys );
	for ( i=0; i<num_subkeys; i++ ) {
		oldkeyname = regsubkey_ctr_specific_key( old_subkeys, i );
		if ( !regsubkey_ctr_key_exists( ctr, oldkeyname ) ) {
			pstr_sprintf( path, "%s%c%s", key, '/', oldkeyname );
			normalize_reg_path( path );
			tdb_delete_bystring( tdb_reg, path );
		}
	}

	TALLOC_FREE( old_subkeys );
	
	/* now create records for any subkeys that don't already exist */
	
	num_subkeys = regsubkey_ctr_numkeys( ctr );
	for ( i=0; i<num_subkeys; i++ ) {
		pstr_sprintf( path, "%s%c%s", key, '/', regsubkey_ctr_specific_key( ctr, i ) );

		if ( !(subkeys = TALLOC_ZERO_P( ctr, REGSUBKEY_CTR )) ) {
			DEBUG(0,("regdb_store_keys: talloc() failure!\n"));
			return False;
		}

		if ( regdb_fetch_keys( path, subkeys ) == -1 ) {
			/* create a record with 0 subkeys */
			if ( !regdb_store_keys_internal( path, subkeys ) ) {
				DEBUG(0,("regdb_store_keys: Failed to store new record for key [%s}\n", path ));
				TALLOC_FREE( subkeys );
				return False;
			}
		}

		TALLOC_FREE( subkeys );
	}
	
	return True;
}


/***********************************************************************
 Retrieve an array of strings containing subkeys.  Memory should be 
 released by the caller.  
 ***********************************************************************/

int regdb_fetch_keys( const char* key, REGSUBKEY_CTR *ctr )
{
	pstring path;
	uint32 num_items;
	TDB_DATA dbuf;
	char *buf;
	uint32 buflen, len;
	int i;
	fstring subkeyname;

	DEBUG(11,("regdb_fetch_keys: Enter key => [%s]\n", key ? key : "NULL"));
	
	pstrcpy( path, key );
	
	/* convert to key format */
	pstring_sub( path, "\\", "/" ); 
	strupper_m( path );
	
	dbuf = tdb_fetch_bystring( tdb_reg, path );
	
	buf = dbuf.dptr;
	buflen = dbuf.dsize;
	
	if ( !buf ) {
		DEBUG(5,("regdb_fetch_keys: tdb lookup failed to locate key [%s]\n", key));
		return -1;
	}
	
	len = tdb_unpack( buf, buflen, "d", &num_items);
	
	for (i=0; i<num_items; i++) {
		len += tdb_unpack( buf+len, buflen-len, "f", subkeyname );
		regsubkey_ctr_addkey( ctr, subkeyname );
	}

	SAFE_FREE( dbuf.dptr );
	
	DEBUG(11,("regdb_fetch_keys: Exit [%d] items\n", num_items));
	
	return num_items;
}

/****************************************************************************
 Unpack a list of registry values frem the TDB
 ***************************************************************************/
 
static int regdb_unpack_values(REGVAL_CTR *values, char *buf, int buflen)
{
	int 		len = 0;
	uint32		type;
	pstring		valuename;
	uint32		size;
	uint8		*data_p;
	uint32 		num_values = 0;
	int 		i;
	
	
	
	/* loop and unpack the rest of the registry values */
	
	len += tdb_unpack(buf+len, buflen-len, "d", &num_values);
	
	for ( i=0; i<num_values; i++ ) {
		/* unpack the next regval */
		
		type = REG_NONE;
		size = 0;
		data_p = NULL;
		len += tdb_unpack(buf+len, buflen-len, "fdB",
				  valuename,
				  &type,
				  &size,
				  &data_p);
				
		/* add the new value. Paranoid protective code -- make sure data_p is valid */

		if ( size && data_p ) {
			regval_ctr_addvalue( values, valuename, type, (const char *)data_p, size );
			SAFE_FREE(data_p); /* 'B' option to tdb_unpack does a malloc() */
		}

		DEBUG(8,("specific: [%s], len: %d\n", valuename, size));
	}

	return len;
}

/****************************************************************************
 Pack all values in all printer keys
 ***************************************************************************/
 
static int regdb_pack_values(REGVAL_CTR *values, char *buf, int buflen)
{
	int 		len = 0;
	int 		i;
	REGISTRY_VALUE	*val;
	int		num_values = regval_ctr_numvals( values );

	if ( !values )
		return 0;

	/* pack the number of values first */
	
	len += tdb_pack( buf+len, buflen-len, "d", num_values );
	
	/* loop over all values */
		
	for ( i=0; i<num_values; i++ ) {			
		val = regval_ctr_specific_value( values, i );
		len += tdb_pack(buf+len, buflen-len, "fdB",
				regval_name(val),
				regval_type(val),
				regval_size(val),
				regval_data_p(val) );
	}

	return len;
}

/***********************************************************************
 Retrieve an array of strings containing subkeys.  Memory should be 
 released by the caller.
 ***********************************************************************/

int regdb_fetch_values( const char* key, REGVAL_CTR *values )
{
	TDB_DATA data;
	pstring keystr;

	DEBUG(10,("regdb_fetch_values: Looking for value of key [%s] \n", key));
	
	pstr_sprintf( keystr, "%s/%s", VALUE_PREFIX, key );
	normalize_reg_path( keystr );
	
	data = tdb_fetch_bystring( tdb_reg, keystr );
	
	if ( !data.dptr ) {
		/* all keys have zero values by default */
		return 0;
	}
	
	regdb_unpack_values( values, data.dptr, data.dsize );
	
	SAFE_FREE( data.dptr );
	
	return regval_ctr_numvals(values);
}

/***********************************************************************
 Stub function since we do not currently support storing registry 
 values in the registry.tdb
 ***********************************************************************/

BOOL regdb_store_values( const char *key, REGVAL_CTR *values )
{
	TDB_DATA data;
	pstring keystr;
	int len, ret;
	
	DEBUG(10,("regdb_store_values: Looking for value of key [%s] \n", key));
	
	ZERO_STRUCT( data );
	
	len = regdb_pack_values( values, data.dptr, data.dsize );
	if ( len <= 0 ) {
		DEBUG(0,("regdb_store_values: unable to pack values. len <= 0\n"));
		return False;
	}
	
	data.dptr = SMB_MALLOC_ARRAY( char, len );
	data.dsize = len;
	
	len = regdb_pack_values( values, data.dptr, data.dsize );
	
	SMB_ASSERT( len == data.dsize );
	
	pstr_sprintf( keystr, "%s/%s", VALUE_PREFIX, key );
	normalize_reg_path( keystr );
	
	ret = tdb_store_bystring(tdb_reg, keystr, data, TDB_REPLACE);
	
	SAFE_FREE( data.dptr );
	
	return ret != -1 ;
}


/* 
 * Table of function pointers for default access
 */
 
REGISTRY_OPS regdb_ops = {
	regdb_fetch_keys,
	regdb_fetch_values,
	regdb_store_keys,
	regdb_store_values,
	NULL
};