Limit chatcommand parameter length in command blocks (#695)

mesecons_commandblock/init.lua

@@ -1,4 +1,5 @@
 local S = minetest.get_translator(minetest.get_current_modname())
+local param_maxlen = mesecon.setting("commandblock_param_maxlen", 10000)
 
 minetest.register_chatcommand("say", {
 	params = "<text>",
@@ -156,6 +157,11 @@ local function commandblock_action_on(pos, node)
 			minetest.chat_send_player(owner, "The command "..cmd.." does not exist")
 			return
 		end
+		if #param > param_maxlen then
+			minetest.chat_send_player(owner, "Command parameters are limited to max. " ..
+				param_maxlen .. " bytes.")
+			return
+		end
 		local has_privs, missing_privs = minetest.check_player_privs(owner, cmddef.privs)
 		if not has_privs then
 			minetest.chat_send_player(owner, "You don't have permission "

settingtypes.txt

@@ -11,6 +11,11 @@ mesecon.cooldown_granularity (Cooldown step length) float 0.5 0.0 1.0
 mesecon.blinky_plant_interval (Plant blinking interval) int 3 1 5
 
 
+[mesecons_commandblock]
+
+mesecon.commandblock_param_maxlen (Maximum command parameter length) int 10000 100 1000000
+
+
 [mesecons_detector]
 
 mesecon.detector_radius (Player detector scanning radius) int 6 3 16