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/*************************************************************************/
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/* scene_rpc_interface.cpp */
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/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
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/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md). */
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/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/*************************************************************************/
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# include "scene/multiplayer/scene_rpc_interface.h"
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# include "core/debugger/engine_debugger.h"
# include "core/io/marshalls.h"
# include "core/multiplayer/multiplayer_api.h"
# include "scene/main/node.h"
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# include "scene/main/window.h"
MultiplayerRPCInterface * SceneRPCInterface : : _create ( MultiplayerAPI * p_multiplayer ) {
return memnew ( SceneRPCInterface ( p_multiplayer ) ) ;
}
void SceneRPCInterface : : make_default ( ) {
MultiplayerAPI : : create_default_rpc_interface = _create ;
}
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# ifdef DEBUG_ENABLED
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_FORCE_INLINE_ void SceneRPCInterface : : _profile_node_data ( const String & p_what , ObjectID p_id ) {
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if ( EngineDebugger : : is_profiling ( " multiplayer " ) ) {
Array values ;
values . push_back ( " node " ) ;
values . push_back ( p_id ) ;
values . push_back ( p_what ) ;
EngineDebugger : : profiler_add_frame_data ( " multiplayer " , values ) ;
}
}
# else
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_FORCE_INLINE_ void SceneRPCInterface : : _profile_node_data ( const String & p_what , ObjectID p_id ) { }
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# endif
// Returns the packet size stripping the node path added when the node is not yet cached.
int get_packet_len ( uint32_t p_node_target , int p_packet_len ) {
if ( p_node_target & 0x80000000 ) {
int ofs = p_node_target & 0x7FFFFFFF ;
return p_packet_len - ( p_packet_len - ofs ) ;
} else {
return p_packet_len ;
}
}
const Multiplayer : : RPCConfig _get_rpc_config ( const Node * p_node , const StringName & p_method , uint16_t & r_id ) {
const Vector < Multiplayer : : RPCConfig > node_config = p_node - > get_node_rpc_methods ( ) ;
for ( int i = 0 ; i < node_config . size ( ) ; i + + ) {
if ( node_config [ i ] . name = = p_method ) {
r_id = ( ( uint16_t ) i ) | ( 1 < < 15 ) ;
return node_config [ i ] ;
}
}
if ( p_node - > get_script_instance ( ) ) {
const Vector < Multiplayer : : RPCConfig > script_config = p_node - > get_script_instance ( ) - > get_rpc_methods ( ) ;
for ( int i = 0 ; i < script_config . size ( ) ; i + + ) {
if ( script_config [ i ] . name = = p_method ) {
r_id = ( uint16_t ) i ;
return script_config [ i ] ;
}
}
}
return Multiplayer : : RPCConfig ( ) ;
}
const Multiplayer : : RPCConfig _get_rpc_config_by_id ( Node * p_node , uint16_t p_id ) {
Vector < Multiplayer : : RPCConfig > config ;
uint16_t id = p_id ;
if ( id & ( 1 < < 15 ) ) {
id = id & ~ ( 1 < < 15 ) ;
config = p_node - > get_node_rpc_methods ( ) ;
} else if ( p_node - > get_script_instance ( ) ) {
config = p_node - > get_script_instance ( ) - > get_rpc_methods ( ) ;
}
if ( id < config . size ( ) ) {
return config [ id ] ;
}
return Multiplayer : : RPCConfig ( ) ;
}
_FORCE_INLINE_ bool _can_call_mode ( Node * p_node , Multiplayer : : RPCMode mode , int p_remote_id ) {
switch ( mode ) {
case Multiplayer : : RPC_MODE_DISABLED : {
return false ;
} break ;
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case Multiplayer : : RPC_MODE_ANY_PEER : {
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return true ;
} break ;
case Multiplayer : : RPC_MODE_AUTHORITY : {
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return ! p_node - > is_multiplayer_authority ( ) & & p_remote_id = = p_node - > get_multiplayer_authority ( ) ;
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} break ;
}
return false ;
}
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String SceneRPCInterface : : get_rpc_md5 ( const Object * p_obj ) const {
const Node * node = Object : : cast_to < Node > ( p_obj ) ;
ERR_FAIL_COND_V ( ! node , " " ) ;
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String rpc_list ;
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const Vector < Multiplayer : : RPCConfig > node_config = node - > get_node_rpc_methods ( ) ;
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for ( int i = 0 ; i < node_config . size ( ) ; i + + ) {
rpc_list + = String ( node_config [ i ] . name ) ;
}
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if ( node - > get_script_instance ( ) ) {
const Vector < Multiplayer : : RPCConfig > script_config = node - > get_script_instance ( ) - > get_rpc_methods ( ) ;
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for ( int i = 0 ; i < script_config . size ( ) ; i + + ) {
rpc_list + = String ( script_config [ i ] . name ) ;
}
}
return rpc_list . md5_text ( ) ;
}
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Node * SceneRPCInterface : : _process_get_node ( int p_from , const uint8_t * p_packet , uint32_t p_node_target , int p_packet_len ) {
Node * root_node = SceneTree : : get_singleton ( ) - > get_root ( ) - > get_node ( multiplayer - > get_root_path ( ) ) ;
ERR_FAIL_COND_V ( ! root_node , nullptr ) ;
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Node * node = nullptr ;
if ( p_node_target & 0x80000000 ) {
// Use full path (not cached yet).
int ofs = p_node_target & 0x7FFFFFFF ;
ERR_FAIL_COND_V_MSG ( ofs > = p_packet_len , nullptr , " Invalid packet received. Size smaller than declared. " ) ;
String paths ;
paths . parse_utf8 ( ( const char * ) & p_packet [ ofs ] , p_packet_len - ofs ) ;
NodePath np = paths ;
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node = root_node - > get_node ( np ) ;
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if ( ! node ) {
ERR_PRINT ( " Failed to get path from RPC: " + String ( np ) + " . " ) ;
}
return node ;
} else {
// Use cached path.
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return Object : : cast_to < Node > ( multiplayer - > get_cached_object ( p_from , p_node_target ) ) ;
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}
}
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void SceneRPCInterface : : process_rpc ( int p_from , const uint8_t * p_packet , int p_packet_len ) {
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// Extract packet meta
int packet_min_size = 1 ;
int name_id_offset = 1 ;
ERR_FAIL_COND_MSG ( p_packet_len < packet_min_size , " Invalid packet received. Size too small. " ) ;
// Compute the meta size, which depends on the compression level.
int node_id_compression = ( p_packet [ 0 ] & NODE_ID_COMPRESSION_FLAG ) > > NODE_ID_COMPRESSION_SHIFT ;
int name_id_compression = ( p_packet [ 0 ] & NAME_ID_COMPRESSION_FLAG ) > > NAME_ID_COMPRESSION_SHIFT ;
switch ( node_id_compression ) {
case NETWORK_NODE_ID_COMPRESSION_8 :
packet_min_size + = 1 ;
name_id_offset + = 1 ;
break ;
case NETWORK_NODE_ID_COMPRESSION_16 :
packet_min_size + = 2 ;
name_id_offset + = 2 ;
break ;
case NETWORK_NODE_ID_COMPRESSION_32 :
packet_min_size + = 4 ;
name_id_offset + = 4 ;
break ;
default :
ERR_FAIL_MSG ( " Was not possible to extract the node id compression mode. " ) ;
}
switch ( name_id_compression ) {
case NETWORK_NAME_ID_COMPRESSION_8 :
packet_min_size + = 1 ;
break ;
case NETWORK_NAME_ID_COMPRESSION_16 :
packet_min_size + = 2 ;
break ;
default :
ERR_FAIL_MSG ( " Was not possible to extract the name id compression mode. " ) ;
}
ERR_FAIL_COND_MSG ( p_packet_len < packet_min_size , " Invalid packet received. Size too small. " ) ;
uint32_t node_target = 0 ;
switch ( node_id_compression ) {
case NETWORK_NODE_ID_COMPRESSION_8 :
node_target = p_packet [ 1 ] ;
break ;
case NETWORK_NODE_ID_COMPRESSION_16 :
node_target = decode_uint16 ( p_packet + 1 ) ;
break ;
case NETWORK_NODE_ID_COMPRESSION_32 :
node_target = decode_uint32 ( p_packet + 1 ) ;
break ;
default :
// Unreachable, checked before.
CRASH_NOW ( ) ;
}
Node * node = _process_get_node ( p_from , p_packet , node_target , p_packet_len ) ;
ERR_FAIL_COND_MSG ( node = = nullptr , " Invalid packet received. Requested node was not found. " ) ;
uint16_t name_id = 0 ;
switch ( name_id_compression ) {
case NETWORK_NAME_ID_COMPRESSION_8 :
name_id = p_packet [ name_id_offset ] ;
break ;
case NETWORK_NAME_ID_COMPRESSION_16 :
name_id = decode_uint16 ( p_packet + name_id_offset ) ;
break ;
default :
// Unreachable, checked before.
CRASH_NOW ( ) ;
}
const int packet_len = get_packet_len ( node_target , p_packet_len ) ;
_process_rpc ( node , name_id , p_from , p_packet , packet_len , packet_min_size ) ;
}
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void SceneRPCInterface : : _process_rpc ( Node * p_node , const uint16_t p_rpc_method_id , int p_from , const uint8_t * p_packet , int p_packet_len , int p_offset ) {
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ERR_FAIL_COND_MSG ( p_offset > p_packet_len , " Invalid packet received. Size too small. " ) ;
// Check that remote can call the RPC on this node.
const Multiplayer : : RPCConfig config = _get_rpc_config_by_id ( p_node , p_rpc_method_id ) ;
ERR_FAIL_COND ( config . name = = StringName ( ) ) ;
bool can_call = _can_call_mode ( p_node , config . rpc_mode , p_from ) ;
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ERR_FAIL_COND_MSG ( ! can_call , " RPC ' " + String ( config . name ) + " ' is not allowed on node " + p_node - > get_path ( ) + " from: " + itos ( p_from ) + " . Mode is " + itos ( ( int ) config . rpc_mode ) + " , authority is " + itos ( p_node - > get_multiplayer_authority ( ) ) + " . " ) ;
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int argc = 0 ;
const bool byte_only_or_no_args = p_packet [ 0 ] & BYTE_ONLY_OR_NO_ARGS_FLAG ;
if ( byte_only_or_no_args ) {
if ( p_offset < p_packet_len ) {
// This packet contains only bytes.
argc = 1 ;
}
} else {
// Normal variant, takes the argument count from the packet.
ERR_FAIL_COND_MSG ( p_offset > = p_packet_len , " Invalid packet received. Size too small. " ) ;
argc = p_packet [ p_offset ] ;
p_offset + = 1 ;
}
Vector < Variant > args ;
Vector < const Variant * > argp ;
args . resize ( argc ) ;
argp . resize ( argc ) ;
# ifdef DEBUG_ENABLED
_profile_node_data ( " in_rpc " , p_node - > get_instance_id ( ) ) ;
# endif
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int out ;
MultiplayerAPI : : decode_and_decompress_variants ( args , & p_packet [ p_offset ] , p_packet_len - p_offset , out , byte_only_or_no_args , multiplayer - > is_object_decoding_allowed ( ) ) ;
for ( int i = 0 ; i < argc ; i + + ) {
argp . write [ i ] = & args [ i ] ;
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}
Callable : : CallError ce ;
p_node - > call ( config . name , ( const Variant * * ) argp . ptr ( ) , argc , ce ) ;
if ( ce . error ! = Callable : : CallError : : CALL_OK ) {
String error = Variant : : get_call_error_text ( p_node , config . name , ( const Variant * * ) argp . ptr ( ) , argc , ce ) ;
error = " RPC - " + error ;
ERR_PRINT ( error ) ;
}
}
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void SceneRPCInterface : : _send_rpc ( Node * p_from , int p_to , uint16_t p_rpc_id , const Multiplayer : : RPCConfig & p_config , const StringName & p_name , const Variant * * p_arg , int p_argcount ) {
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Ref < MultiplayerPeer > peer = multiplayer - > get_multiplayer_peer ( ) ;
ERR_FAIL_COND_MSG ( peer . is_null ( ) , " Attempt to call RPC without active multiplayer peer. " ) ;
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ERR_FAIL_COND_MSG ( peer - > get_connection_status ( ) = = MultiplayerPeer : : CONNECTION_CONNECTING , " Attempt to call RPC while multiplayer peer is not connected yet. " ) ;
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ERR_FAIL_COND_MSG ( peer - > get_connection_status ( ) = = MultiplayerPeer : : CONNECTION_DISCONNECTED , " Attempt to call RPC while multiplayer peer is disconnected. " ) ;
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ERR_FAIL_COND_MSG ( p_argcount > 255 , " Too many arguments (>255). " ) ;
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if ( p_to ! = 0 & & ! multiplayer - > get_connected_peers ( ) . has ( ABS ( p_to ) ) ) {
ERR_FAIL_COND_MSG ( p_to = = peer - > get_unique_id ( ) , " Attempt to call RPC on yourself! Peer unique ID: " + itos ( peer - > get_unique_id ( ) ) + " . " ) ;
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ERR_FAIL_MSG ( " Attempt to call RPC with unknown peer ID: " + itos ( p_to ) + " . " ) ;
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}
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NodePath from_path = multiplayer - > get_root_path ( ) . rel_path_to ( p_from - > get_path ( ) ) ;
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ERR_FAIL_COND_MSG ( from_path . is_empty ( ) , " Unable to send RPC. Relative path is empty. THIS IS LIKELY A BUG IN THE ENGINE! " ) ;
// See if all peers have cached path (if so, call can be fast).
int psc_id ;
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const bool has_all_peers = multiplayer - > send_object_cache ( p_from , from_path , p_to , psc_id ) ;
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// Create base packet, lots of hardcode because it must be tight.
int ofs = 0 ;
# define MAKE_ROOM(m_amount) \
if ( packet_cache . size ( ) < m_amount ) \
packet_cache . resize ( m_amount ) ;
// Encode meta.
uint8_t command_type = MultiplayerAPI : : NETWORK_COMMAND_REMOTE_CALL ;
uint8_t node_id_compression = UINT8_MAX ;
uint8_t name_id_compression = UINT8_MAX ;
bool byte_only_or_no_args = false ;
MAKE_ROOM ( 1 ) ;
// The meta is composed along the way, so just set 0 for now.
packet_cache . write [ 0 ] = 0 ;
ofs + = 1 ;
// Encode Node ID.
if ( has_all_peers ) {
// Compress the node ID only if all the target peers already know it.
if ( psc_id > = 0 & & psc_id < = 255 ) {
// We can encode the id in 1 byte
node_id_compression = NETWORK_NODE_ID_COMPRESSION_8 ;
MAKE_ROOM ( ofs + 1 ) ;
packet_cache . write [ ofs ] = static_cast < uint8_t > ( psc_id ) ;
ofs + = 1 ;
} else if ( psc_id > = 0 & & psc_id < = 65535 ) {
// We can encode the id in 2 bytes
node_id_compression = NETWORK_NODE_ID_COMPRESSION_16 ;
MAKE_ROOM ( ofs + 2 ) ;
encode_uint16 ( static_cast < uint16_t > ( psc_id ) , & ( packet_cache . write [ ofs ] ) ) ;
ofs + = 2 ;
} else {
// Too big, let's use 4 bytes.
node_id_compression = NETWORK_NODE_ID_COMPRESSION_32 ;
MAKE_ROOM ( ofs + 4 ) ;
encode_uint32 ( psc_id , & ( packet_cache . write [ ofs ] ) ) ;
ofs + = 4 ;
}
} else {
// The targets don't know the node yet, so we need to use 32 bits int.
node_id_compression = NETWORK_NODE_ID_COMPRESSION_32 ;
MAKE_ROOM ( ofs + 4 ) ;
encode_uint32 ( psc_id , & ( packet_cache . write [ ofs ] ) ) ;
ofs + = 4 ;
}
// Encode method ID
if ( p_rpc_id < = UINT8_MAX ) {
// The ID fits in 1 byte
name_id_compression = NETWORK_NAME_ID_COMPRESSION_8 ;
MAKE_ROOM ( ofs + 1 ) ;
packet_cache . write [ ofs ] = static_cast < uint8_t > ( p_rpc_id ) ;
ofs + = 1 ;
} else {
// The ID is larger, let's use 2 bytes
name_id_compression = NETWORK_NAME_ID_COMPRESSION_16 ;
MAKE_ROOM ( ofs + 2 ) ;
encode_uint16 ( p_rpc_id , & ( packet_cache . write [ ofs ] ) ) ;
ofs + = 2 ;
}
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int len ;
Error err = MultiplayerAPI : : encode_and_compress_variants ( p_arg , p_argcount , nullptr , len , & byte_only_or_no_args , multiplayer - > is_object_decoding_allowed ( ) ) ;
ERR_FAIL_COND_MSG ( err ! = OK , " Unable to encode RPC arguments. THIS IS LIKELY A BUG IN THE ENGINE! " ) ;
if ( byte_only_or_no_args ) {
MAKE_ROOM ( ofs + len ) ;
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} else {
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MAKE_ROOM ( ofs + 1 + len ) ;
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packet_cache . write [ ofs ] = p_argcount ;
ofs + = 1 ;
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}
if ( len ) {
MultiplayerAPI : : encode_and_compress_variants ( p_arg , p_argcount , & packet_cache . write [ ofs ] , len , & byte_only_or_no_args , multiplayer - > is_object_decoding_allowed ( ) ) ;
ofs + = len ;
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}
ERR_FAIL_COND ( command_type > 7 ) ;
ERR_FAIL_COND ( node_id_compression > 3 ) ;
ERR_FAIL_COND ( name_id_compression > 1 ) ;
// We can now set the meta
packet_cache . write [ 0 ] = command_type + ( node_id_compression < < NODE_ID_COMPRESSION_SHIFT ) + ( name_id_compression < < NAME_ID_COMPRESSION_SHIFT ) + ( byte_only_or_no_args ? BYTE_ONLY_OR_NO_ARGS_FLAG : 0 ) ;
# ifdef DEBUG_ENABLED
multiplayer - > profile_bandwidth ( " out " , ofs ) ;
# endif
// Take chance and set transfer mode, since all send methods will use it.
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peer - > set_transfer_channel ( p_config . channel ) ;
peer - > set_transfer_mode ( p_config . transfer_mode ) ;
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if ( has_all_peers ) {
// They all have verified paths, so send fast.
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peer - > set_target_peer ( p_to ) ; // To all of you.
peer - > put_packet ( packet_cache . ptr ( ) , ofs ) ; // A message with love.
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} else {
// Unreachable because the node ID is never compressed if the peers doesn't know it.
CRASH_COND ( node_id_compression ! = NETWORK_NODE_ID_COMPRESSION_32 ) ;
// Not all verified path, so send one by one.
// Append path at the end, since we will need it for some packets.
CharString pname = String ( from_path ) . utf8 ( ) ;
int path_len = encode_cstring ( pname . get_data ( ) , nullptr ) ;
MAKE_ROOM ( ofs + path_len ) ;
encode_cstring ( pname . get_data ( ) , & ( packet_cache . write [ ofs ] ) ) ;
for ( const int & P : multiplayer - > get_connected_peers ( ) ) {
if ( p_to < 0 & & P = = - p_to ) {
continue ; // Continue, excluded.
}
if ( p_to > 0 & & P ! = p_to ) {
continue ; // Continue, not for this peer.
}
bool confirmed = multiplayer - > is_cache_confirmed ( from_path , P ) ;
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peer - > set_target_peer ( P ) ; // To this one specifically.
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if ( confirmed ) {
// This one confirmed path, so use id.
encode_uint32 ( psc_id , & ( packet_cache . write [ 1 ] ) ) ;
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peer - > put_packet ( packet_cache . ptr ( ) , ofs ) ;
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} else {
// This one did not confirm path yet, so use entire path (sorry!).
encode_uint32 ( 0x80000000 | ofs , & ( packet_cache . write [ 1 ] ) ) ; // Offset to path and flag.
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peer - > put_packet ( packet_cache . ptr ( ) , ofs + path_len ) ;
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}
}
}
}
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void SceneRPCInterface : : rpcp ( Object * p_obj , int p_peer_id , const StringName & p_method , const Variant * * p_arg , int p_argcount ) {
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Ref < MultiplayerPeer > peer = multiplayer - > get_multiplayer_peer ( ) ;
ERR_FAIL_COND_MSG ( ! peer . is_valid ( ) , " Trying to call an RPC while no multiplayer peer is active. " ) ;
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Node * node = Object : : cast_to < Node > ( p_obj ) ;
ERR_FAIL_COND ( ! node ) ;
ERR_FAIL_COND_MSG ( ! node - > is_inside_tree ( ) , " Trying to call an RPC on a node which is not inside SceneTree. " ) ;
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ERR_FAIL_COND_MSG ( peer - > get_connection_status ( ) ! = MultiplayerPeer : : CONNECTION_CONNECTED , " Trying to call an RPC via a multiplayer peer which is not connected. " ) ;
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int node_id = peer - > get_unique_id ( ) ;
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bool call_local_native = false ;
bool call_local_script = false ;
uint16_t rpc_id = UINT16_MAX ;
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const Multiplayer : : RPCConfig config = _get_rpc_config ( node , p_method , rpc_id ) ;
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ERR_FAIL_COND_MSG ( config . name = = StringName ( ) ,
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vformat ( " Unable to get the RPC configuration for the function \" %s \" at path: \" %s \" . This happens when the method is not marked for RPCs. " , p_method , node - > get_path ( ) ) ) ;
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if ( p_peer_id = = 0 | | p_peer_id = = node_id | | ( p_peer_id < 0 & & p_peer_id ! = - node_id ) ) {
if ( rpc_id & ( 1 < < 15 ) ) {
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call_local_native = config . call_local ;
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} else {
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call_local_script = config . call_local ;
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}
}
if ( p_peer_id ! = node_id ) {
# ifdef DEBUG_ENABLED
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_profile_node_data ( " out_rpc " , node - > get_instance_id ( ) ) ;
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# endif
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_send_rpc ( node , p_peer_id , rpc_id , config , p_method , p_arg , p_argcount ) ;
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}
if ( call_local_native ) {
Callable : : CallError ce ;
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multiplayer - > set_remote_sender_override ( peer - > get_unique_id ( ) ) ;
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node - > call ( p_method , p_arg , p_argcount , ce ) ;
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multiplayer - > set_remote_sender_override ( 0 ) ;
if ( ce . error ! = Callable : : CallError : : CALL_OK ) {
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String error = Variant : : get_call_error_text ( node , p_method , p_arg , p_argcount , ce ) ;
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error = " rpc() aborted in local call: - " + error + " . " ;
ERR_PRINT ( error ) ;
return ;
}
}
if ( call_local_script ) {
Callable : : CallError ce ;
ce . error = Callable : : CallError : : CALL_OK ;
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multiplayer - > set_remote_sender_override ( peer - > get_unique_id ( ) ) ;
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node - > get_script_instance ( ) - > call ( p_method , p_arg , p_argcount , ce ) ;
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multiplayer - > set_remote_sender_override ( 0 ) ;
if ( ce . error ! = Callable : : CallError : : CALL_OK ) {
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String error = Variant : : get_call_error_text ( node , p_method , p_arg , p_argcount , ce ) ;
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error = " rpc() aborted in script local call: - " + error + " . " ;
ERR_PRINT ( error ) ;
return ;
}
}
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ERR_FAIL_COND_MSG ( p_peer_id = = node_id & & ! config . call_local , " RPC ' " + p_method + " ' on yourself is not allowed by selected mode. " ) ;
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}