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authororwell96 <orwell@bleipb.de>2018-07-17 21:15:34 +0200
committerorwell96 <orwell@bleipb.de>2018-08-12 17:56:02 +0200
commitb80ba056d9ba993109ceae11eac403139afec39f (patch)
treeacee65ed6fac8a18716b31406e1056dfe7d4f5ac /advtrains_train_subway/init.lua
parent6d7d9d018161c5e14cfa0992bc3361e5df071c6f (diff)
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Fix some incompatibility crash for old worlds
Diffstat (limited to 'advtrains_train_subway/init.lua')
0 files changed, 0 insertions, 0 deletions
generated by cgit v1.2.3 (git 2.39.1) at 2025-07-11 18:22:36 +0000
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-------------
-- lua sandboxed environment

-- function to cross out functions and userdata.
-- modified from dump()
function atlatc.remove_invalid_data(o, nested)
	if o==nil then return nil end
	local valid_dt={["nil"]=true, boolean=true, number=true, string=true}
	if type(o) ~= "table" then
		--check valid data type
		if not valid_dt[type(o)] then
			return nil
		end
		return o
	end
	-- Contains table -> true/nil of currently nested tables
	nested = nested or {}
	if nested[o] then
		return nil
	end
	nested[o] = true
	for k, v in pairs(o) do
		v = atlatc.remove_invalid_data(v, nested)
	end
	nested[o] = nil
	return o
end


local env_proto={
	load = function(self, envname, data)
		self.name=envname
		self.sdata=data.sdata and atlatc.remove_invalid_data(data.sdata) or {}
		self.fdata={}
		self.init_code=data.init_code or ""
		self.step_code=data.step_code or ""
	end,
	save = function(self)
		-- throw any function values out of the sdata table
		self.sdata = atlatc.remove_invalid_data(self.sdata)
		return {sdata = self.sdata, init_code=self.init_code, step_code=self.step_code}
	end,
}

--Environment
--Code modified from mesecons_luacontroller (credit goes to Jeija and mesecons contributors)

local safe_globals = {
	"assert", "error", "ipairs", "next", "pairs", "select",
	"tonumber", "tostring", "type", "unpack", "_VERSION"
}

--print is actually minetest.chat_send_all()
--using advtrains.print_concat_table because it's cool
local function safe_print(t, ...)
	local str=advtrains.print_concat_table({t, ...})
	minetest.log("action", "[atlatc] "..str)
	minetest.chat_send_all(str)
end

local function safe_date()
	return(os.date("*t",os.time()))
end

-- string.rep(str, n) with a high value for n can be used to DoS
-- the server. Therefore, limit max. length of generated string.
local function safe_string_rep(str, n)
	if #str * n > 2000 then
		debug.sethook() -- Clear hook
		error("string.rep: string length overflow", 2)
	end

	return string.rep(str, n)
end

-- string.find with a pattern can be used to DoS the server.
-- Therefore, limit string.find to patternless matching.
-- Note: Disabled security since there are enough security leaks and this would be unneccessary anyway to DoS the server
local function safe_string_find(...)
	--if (select(4, ...)) ~= true then
	--	debug.sethook() -- Clear hook
	--	error("string.find: 'plain' (fourth parameter) must always be true for security reasons.")
	--end

	return string.find(...)
end

local mp=minetest.get_modpath("advtrains_luaautomation")