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CSM: add requested CSM_RF_READ_PLAYERINFO (#8007)

* CSM: add requested CSM_RF_READ_PLAYERINFO

This new CSM limit permit to limit PLAYERINFO read from server.

It affects get_player_names call
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nerzhul committed Dec 24, 2018
1 parent 9080d7c commit a5197eaebc61ac6b555a640f36c0b427faef381d
@@ -40,8 +40,13 @@ end)
core.register_chatcommand("list_players", {
description = core.gettext("List online players"),
func = function(param)
local players = table.concat(core.get_player_names(), ", ")
core.display_chat_message(core.gettext("Online players: ") .. players)
local player_names = core.get_player_names()
if not player_names then
return false, core.gettext("This command is disabled by server.")
end

local players = table.concat(player_names, ", ")
return true, core.gettext("Online players: ") .. players
end
})

@@ -1198,7 +1198,7 @@ server_side_occlusion_culling (Server side occlusion culling) bool true
# READ_NODEDEFS: 8 (disable get_node_def call client-side)
# LOOKUP_NODES_LIMIT: 16 (limits get_node call client-side to
# csm_restriction_noderange)
csm_restriction_flags (Client side modding restrictions) int 30
csm_restriction_flags (Client side modding restrictions) int 62

# If the CSM restriction for node range is enabled, get_node calls are limited
# to this distance from the player to the node.
@@ -763,7 +763,7 @@ Call these functions only at load time!

### Client Environment
* `minetest.get_player_names()`
* Returns list of player names on server
* Returns list of player names on server (nil if CSM_RF_READ_PLAYERINFO is enabled by server)
* `minetest.disconnect()`
* Disconnect from the server and exit to main menu.
* Returns `false` if the client is already disconnecting otherwise returns `true`.
@@ -1468,8 +1468,9 @@
# READ_NODEDEFS: 8 (disable get_node_def call client-side)
# LOOKUP_NODES_LIMIT: 16 (limits get_node call client-side to
# csm_restriction_noderange)
# READ_PLAYERINFO: 32 (disable get_player_names call client-side)
# type: int
# csm_restriction_flags = 30
# csm_restriction_flags = 62

# If the CSM restriction for node range is enabled, get_node calls are limited
# to this distance from the player to the node.
@@ -346,7 +346,7 @@ void set_default_settings(Settings *settings)
settings->setDefault("max_block_send_distance", "9");
settings->setDefault("block_send_optimize_distance", "4");
settings->setDefault("server_side_occlusion_culling", "true");
settings->setDefault("csm_restriction_flags", "30");
settings->setDefault("csm_restriction_flags", "62");
settings->setDefault("csm_restriction_noderange", "0");
settings->setDefault("max_clearobjects_extra_loaded_blocks", "4096");
settings->setDefault("time_speed", "72");
@@ -952,5 +952,6 @@ enum CSMRestrictionFlags : u64 {
CSM_RF_READ_ITEMDEFS = 0x00000004, // Disable itemdef lookups
CSM_RF_READ_NODEDEFS = 0x00000008, // Disable nodedef lookups
CSM_RF_LOOKUP_NODES = 0x00000010, // Limit node lookups
CSM_RF_READ_PLAYERINFO = 0x00000020, // Disable player info lookups
CSM_RF_ALL = 0xFFFFFFFF,
};
@@ -116,6 +116,13 @@ int ModApiClient::l_clear_out_chat_queue(lua_State *L)
// get_player_names()
int ModApiClient::l_get_player_names(lua_State *L)
{
// clang-format off
if (getClient(L)->checkCSMRestrictionFlag(
CSMRestrictionFlags::CSM_RF_READ_PLAYERINFO)) {
return 0;
}
// clang-format on

const std::list<std::string> &plist = getClient(L)->getConnectedPlayerNames();
lua_createtable(L, plist.size(), 0);
int newTable = lua_gettop(L);

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