summaryrefslogtreecommitdiff
path: root/mesecons_luacontroller/init.lua
blob: 0e3440e030ed1bbf627740dea20d0378f9582b57 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
--        ______
--       |
--       |
--       |        __       ___  _   __         _  _
-- |   | |       |  | |\ |  |  |_| |  | |  |  |_ |_|
-- |___| |______ |__| | \|  |  | \ |__| |_ |_ |_ |\
-- |
-- |
--

-- Reference
-- ports = get_real_port_states(pos): gets if inputs are powered from outside
-- newport = merge_port_states(state1, state2): just does result = state1 or state2 for every port
-- set_port(pos, rule, state): activates/deactivates the mesecons according to the port states
-- set_port_states(pos, ports): Applies new port states to a Luacontroller at pos
-- run(pos): runs the code in the controller at pos
-- reset_meta(pos, code, errmsg): performs a software-reset, installs new code and prints error messages
-- resetn(pos): performs a hardware reset, turns off all ports
--
-- The Sandbox
-- The whole code of the controller runs in a sandbox,
-- a very restricted environment.
-- Actually the only way to damage the server is to
-- use too much memory from the sandbox.
-- You can add more functions to the environment
-- (see where local env is defined)
-- Something nice to play is is appending minetest.env to it.

local BASENAME = "mesecons_luacontroller:luacontroller"

local rules = {
	a = {x = -1, y = 0, z =  0, name="A"},
	b = {x =  0, y = 0, z =  1, name="B"},
	c = {x =  1, y = 0, z =  0, name="C"},
	d = {x =  0, y = 0, z = -1, name="D"},
}


------------------
-- Action stuff --
------------------
-- These helpers are required to set the port states of the luacontroller

local function update_real_port_states(pos, rule_name, new_state)
	local meta = minetest.get_meta(pos)
	if rule_name == nil then
		meta:set_int("real_portstates", 1)
		return
	end
	local n = meta:get_int("real_portstates") - 1
	local L = {}
	for i = 1, 4 do
		L[i] = n % 2
		n = math.floor(n / 2)
	end
	--                   (0,-1) (-1,0)      (1,0) (0,1)
	local pos_to_side = {  4,     1,   nil,   3,    2 }
	if rule_name.x == nil then
		for _, rname in ipairs(rule_name) do
			local port = pos_to_side[rname.x + (2 * rname.z) + 3]
			L[port] = (newstate == "on") and 1 or 0
		end
	else
		local port = pos_to_side[rule_name.x + (2 * rule_name.z) + 3]
		L[port] = (new_state == "on") and 1 or 0
	end
	meta:set_int("real_portstates",
		1 +
		1 * L[1] +
		2 * L[2] +
		4 * L[3] +
		8 * L[4])
end


local port_names = {"a", "b", "c", "d"}

local function get_real_port_states(pos)
	-- Determine if ports are powered (by itself or from outside)
	local meta = minetest.get_meta(pos)
	local L = {}
	local n = meta:get_int("real_portstates") - 1
	for _, name in ipairs(port_names) do
		L[name] = ((n % 2) == 1)
		n = math.floor(n / 2)
	end
	return L
end


local function merge_port_states(ports, vports)
	return {
		a = ports.a or vports.a,
		b = ports.b or vports.b,
		c = ports.c or vports.c,
		d = ports.d or vports.d,
	}
end

local function generate_name(ports)
	local d = ports.d and 1 or 0
	local c = ports.c and 1 or 0
	local b = ports.b and 1 or 0
	local a = ports.a and 1 or 0
	return BASENAME..d..c..b..a
end


local function set_port(pos, rule, state)
	if state then
		mesecon.receptor_on(pos, {rule})
	else
		mesecon.receptor_off(pos, {rule})
	end
end


local function clean_port_states(ports)
	ports.a = ports.a and true or false
	ports.b = ports.b and true or false
	ports.c = ports.c and true or false
	ports.d = ports.d and true or false
end


local function set_port_states(pos, ports)
	local node = minetest.get_node(pos)
	local name = node.name
	clean_port_states(ports)
	local vports = minetest.registered_nodes[name].virtual_portstates
	local new_name = generate_name(ports)

	if name ~= new_name and vports then
		-- Problem:
		-- We need to place the new node first so that when turning
		-- off some port, it won't stay on because the rules indicate
		-- there is an onstate output port there.
		-- When turning the output off then, it will however cause feedback
		-- so that the luacontroller will receive an "off" event by turning
		-- its output off.
		-- Solution / Workaround:
		-- Remember which output was turned off and ignore next "off" event.
		local meta = minetest.get_meta(pos)
		local ign = minetest.deserialize(meta:get_string("ignore_offevents")) or {}
		if ports.a and not vports.a and not mesecon.is_powered(pos, rules.a) then ign.A = true end
		if ports.b and not vports.b and not mesecon.is_powered(pos, rules.b) then ign.B = true end
		if ports.c and not vports.c and not mesecon.is_powered(pos, rules.c) then ign.C = true end
		if ports.d and not vports.d and not mesecon.is_powered(pos, rules.d) then ign.D = true end
		meta:set_string("ignore_offevents", minetest.serialize(ign))

		minetest.swap_node(pos, {name = new_name, param2 = node.param2})

		if ports.a ~= vports.a then set_port(pos, rules.a, ports.a) end
		if ports.b ~= vports.b then set_port(pos, rules.b, ports.b) end
		if ports.c ~= vports.c then set_port(pos, rules.c, ports.c) end
		if ports.d ~= vports.d then set_port(pos, rules.d, ports.d) end
	end
end


-----------------
-- Overheating --
-----------------
local function burn_controller(pos)
	local node = minetest.get_node(pos)
	node.name = BASENAME.."_burnt"
	minetest.swap_node(pos, node)
	minetest.get_meta(pos):set_string("lc_memory", "");
	-- Wait for pending operations
	minetest.after(0.2, mesecon.receptor_off, pos, mesecon.rules.flat)
end

local function overheat(pos, meta)
	if mesecon.do_overheat(pos) then -- If too hot
		burn_controller(pos)
		return true
	end
end

------------------------
-- Ignored off events --
------------------------

local function ignore_event(event, meta)
	if event.type ~= "off" then return false end
	local ignore_offevents = minetest.deserialize(meta:get_string("ignore_offevents")) or {}
	if ignore_offevents[event.pin.name] then
		ignore_offevents[event.pin.name] = nil
		meta:set_string("ignore_offevents", minetest.serialize(ignore_offevents))
		return true
	end
end

-------------------------
-- Parsing and running --
-------------------------

local function safe_print(param)
	print(dump(param))
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 > mesecon.setting("luacontroller_string_rep_max", 64000) 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.
local function safe_string_find(...)
	if (select(4, ...)) ~= true then
		debug.sethook() -- Clear hook
		error("string.find: 'plain' (fourth parameter) must always be true in a Luacontroller")
	end

	return string.find(...)
end

local function remove_functions(x)
	local tp = type(x)
	if tp == "function" then
		return nil
	end

	-- Make sure to not serialize the same table multiple times, otherwise
	-- writing mem.test = mem in the Luacontroller will lead to infinite recursion
	local seen = {}

	local function rfuncs(x)
		if seen[x] then return end
		seen[x] = true
		if type(x) ~= "table" then return end

		for key, value in pairs(x) do
			if type(key) == "function" or type(value) == "function" then
				x[key] = nil
			else
				if type(key) == "table" then
					rfuncs(key)
				end
				if type(value) == "table" then
					rfuncs(value)
				end
			end
		end
	end

	rfuncs(x)

	return x
end

local function get_interrupt(pos)
	-- iid = interrupt id
	local function interrupt(time, iid)
		if type(time) ~= "number" then return end
		local luac_id = minetest.get_meta(pos):get_int("luac_id")
		mesecon.queue:add_action(pos, "lc_interrupt", {luac_id, iid}, time, iid, 1)
	end
	return interrupt
end


-- Given a message object passed to digiline_send, clean it up into a form
-- which is safe to transmit over the network and compute its "cost" (a very
-- rough estimate of its memory usage).
--
-- The cleaning comprises the following:
-- 1. Functions (and userdata, though user scripts ought not to get hold of
--    those in the first place) are removed, because they break the model of
--    Digilines as a network that carries basic data, and they could exfiltrate
--    references to mutable objects from one Luacontroller to another, allowing
--    inappropriate high-bandwidth, no-wires communication.
-- 2. Tables are duplicated because, being mutable, they could otherwise be
--    modified after the send is complete in order to change what data arrives
--    at the recipient, perhaps in violation of the previous cleaning rule or
--    in violation of the message size limit.
--
-- The cost indication is only approximate; it’s not a perfect measurement of
-- the number of bytes of memory used by the message object.
--
-- Parameters:
-- msg -- the message to clean
-- back_references -- for internal use only; do not provide
--
-- Returns:
-- 1. The cleaned object.
-- 2. The approximate cost of the object.
local function clean_and_weigh_digiline_message(msg, back_references)
	local t = type(msg)
	if t == "string" then
		-- Strings are immutable so can be passed by reference, and cost their
		-- length plus the size of the Lua object header (24 bytes on a 64-bit
		-- platform) plus one byte for the NUL terminator.
		return msg, #msg + 25
	elseif t == "number" then
		-- Numbers are passed by value so need not be touched, and cost 8 bytes
		-- as all numbers in Lua are doubles.
		return msg, 8
	elseif t == "boolean" then
		-- Booleans are passed by value so need not be touched, and cost 1
		-- byte.
		return msg, 1
	elseif t == "table" then
		-- Tables are duplicated. Check if this table has been seen before
		-- (self-referential or shared table); if so, reuse the cleaned value
		-- of the previous occurrence, maintaining table topology and avoiding
		-- infinite recursion, and charge zero bytes for this as the object has
		-- already been counted.
		back_references = back_references or {}
		local bref = back_references[msg]
		if bref then
			return bref, 0
		end
		-- Construct a new table by cleaning all the keys and values and adding
		-- up their costs, plus 8 bytes as a rough estimate of table overhead.
		local cost = 8
		local ret = {}
		back_references[msg] = ret
		for k, v in pairs(msg) do
			local k_cost, v_cost
			k, k_cost = clean_and_weigh_digiline_message(k, back_references)
			v, v_cost = clean_and_weigh_digiline_message(v, back_references)
			if k ~= nil and v ~= nil then
				-- Only include an element if its key and value are of legal
				-- types.
				ret[k] = v
			end
			-- If we only counted the cost of a table element when we actually
			-- used it, we would be vulnerable to the following attack:
			-- 1. Construct a huge table (too large to pass the cost limit).
			-- 2. Insert it somewhere in a table, with a function as a key.
			-- 3. Insert it somewhere in another table, with a number as a key.
			-- 4. The first occurrence doesn’t pay the cost because functions
			--    are stripped and therefore the element is dropped.
			-- 5. The second occurrence doesn’t pay the cost because it’s in
			--    back_references.
			-- By counting the costs regardless of whether the objects will be
			-- included, we avoid this attack; it may overestimate the cost of
			-- some messages, but only those that won’t be delivered intact
			-- anyway because they contain illegal object types.
			cost = cost + k_cost + v_cost
		end
		return ret, cost
	else
		return nil, 0
	end
end


local function get_digiline_send(pos)
	if not minetest.global_exists("digilines") then return end
	return function(channel, msg)
		-- Make sure channel is string, number or boolean
		if (type(channel) ~= "string" and type(channel) ~= "number" and type(channel) ~= "boolean") then
			return false
		end

		local msg_cost
		msg, msg_cost = clean_and_weigh_digiline_message(msg)
		if msg == nil or msg_cost > mesecon.setting("luacontroller_digiline_maxlen", 50000) then
			return false
		end

		minetest.after(0, digilines.receptor_send, pos, digilines.rules.default, channel, msg)
		return true
	end
end


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

local function create_environment(pos, mem, event)
	-- Gather variables for the environment
	local vports = minetest.registered_nodes[minetest.get_node(pos).name].virtual_portstates
	local vports_copy = {}
	for k, v in pairs(vports) do vports_copy[k] = v end
	local rports = get_real_port_states(pos)

	-- Create new library tables on each call to prevent one Luacontroller
	-- from breaking a library and messing up other Luacontrollers.
	local env = {
		pin = merge_port_states(vports, rports),
		port = vports_copy,
		event = event,
		mem = mem,
		heat = mesecon.get_heat(pos),
		heat_max = mesecon.setting("overheat_max", 20),
		print = safe_print,
		interrupt = get_interrupt(pos),
		digiline_send = get_digiline_send(pos),
		string = {
			byte = string.byte,
			char = string.char,
			format = string.format,
			len = string.len,
			lower = string.lower,
			upper = string.upper,
			rep = safe_string_rep,
			reverse = string.reverse,
			sub = string.sub,
			find = safe_string_find,
		},
		math = {
			abs = math.abs,
			acos = math.acos,
			asin = math.asin,
			atan = math.atan,
			atan2 = math.atan2,
			ceil = math.ceil,
			cos = math.cos,
			cosh = math.cosh,
			deg = math.deg,
			exp = math.exp,
			floor = math.floor,
			fmod = math.fmod,
			frexp = math.frexp,
			huge = math.huge,
			ldexp = math.ldexp,
			log = math.log,
			log10 = math.log10,
			max = math.max,
			min = math.min,
			modf = math.modf,
			pi = math.pi,
			pow = math.pow,
			rad = math.rad,
			random = math.random,
			sin = math.sin,
			sinh = math.sinh,
			sqrt = math.sqrt,
			tan = math.tan,
			tanh = math.tanh,
		},
		table = {
			concat = table.concat,
			insert = table.insert,
			maxn = table.maxn,
			remove = table.remove,
			sort = table.sort,
		},
		os = {
			clock = os.clock,
			difftime = os.difftime,
			time = os.time,
			datetable = safe_date,
		},
	}
	env._G = env

	for _, name in pairs(safe_globals) do
		env[name] = _G[name]
	end

	return env
end


local function timeout()
	debug.sethook() -- Clear hook
	error("Code timed out!", 2)
end


local function create_sandbox(code, env)
	if code:byte(1) == 27 then
		return nil, "Binary code prohibited."
	end
	local f, msg = loadstring(code)
	if not f then return nil, msg end
	setfenv(f, env)

	-- Turn off JIT optimization for user code so that count
	-- events are generated when adding debug hooks
	if rawget(_G, "jit") then
		jit.off(f, true)
	end

	return function(...)
		-- Use instruction counter to stop execution
		-- after luacontroller_maxevents
		local maxevents = mesecon.setting("luacontroller_maxevents", 10000)
		debug.sethook(timeout, "", maxevents)
		local ok, ret = pcall(f, ...)
		debug.sethook()  -- Clear hook
		if not ok then error(ret, 0) end
		return ret
	end
end


local function load_memory(meta)
	return minetest.deserialize(meta:get_string("lc_memory")) or {}
end


local function save_memory(pos, meta, mem)
	local memstring = minetest.serialize(remove_functions(mem))
	local memsize_max = mesecon.setting("luacontroller_memsize", 100000)

	if (#memstring <= memsize_max) then
		meta:set_string("lc_memory", memstring)
	else
		print("Error: Luacontroller memory overflow. "..memsize_max.." bytes available, "
				..#memstring.." required. Controller overheats.")
		burn_controller(pos)
	end
end


local function run(pos, event)
	local meta = minetest.get_meta(pos)
	if overheat(pos) then return end
	if ignore_event(event, meta) then return end

	-- Load code & mem from meta
	local mem  = load_memory(meta)
	local code = meta:get_string("code")

	-- Create environment
	local env = create_environment(pos, mem, event)

	-- Create the sandbox and execute code
	local f, msg = create_sandbox(code, env)
	if not f then return msg end
	local success, msg = pcall(f)
	if not success then return msg end
	if type(env.port) ~= "table" then
		return "Ports set are invalid."
	end

	-- Actually set the ports
	set_port_states(pos, env.port)

	-- Save memory. This may burn the luacontroller if a memory overflow occurs.
	save_memory(pos, meta, env.mem)
end

mesecon.queue:add_function("lc_interrupt", function (pos, luac_id, iid)
	-- There is no luacontroller anymore / it has been reprogrammed / replaced / burnt
	if (minetest.get_meta(pos):get_int("luac_id") ~= luac_id) then return end
	if (minetest.registered_nodes[minetest.get_node(pos).name].is_burnt) then return end
	run(pos, {type="interrupt", iid = iid})
end)

local function reset_meta(pos, code, errmsg)
	local meta = minetest.get_meta(pos)
	meta:set_string("code", code)
	code = minetest.formspec_escape(code or "")
	errmsg = minetest.formspec_escape(tostring(errmsg or ""))
	meta:set_string("formspec", "size[12,10]"..
		"background[-0.2,-0.25;12.4,10.75;jeija_luac_background.png]"..
		"textarea[0.2,0.2;12.2,9.5;code;;"..code.."]"..
		"image_button[4.75,8.75;2.5,1;jeija_luac_runbutton.png;program;]"..
		"image_button_exit[11.72,-0.25;0.425,0.4;jeija_close_window.png;exit;]"..
		"label[0.1,9;"..errmsg.."]")
	meta:set_int("luac_id", math.random(1, 65535))
end

local function reset(pos)
	set_port_states(pos, {a=false, b=false, c=false, d=false})
end


-----------------------
-- Node Registration --
-----------------------

local output_rules = {}
local input_rules = {}

local node_box = {
	type = "fixed",
	fixed = {
		{-8/16, -8/16, -8/16, 8/16, -7/16, 8/16}, -- Bottom slab
		{-5/16, -7/16, -5/16, 5/16, -6/16, 5/16}, -- Circuit board
		{-3/16, -6/16, -3/16, 3/16, -5/16, 3/16}, -- IC
	}
}

local selection_box = {
	type = "fixed",
	fixed = { -8/16, -8/16, -8/16, 8/16, -5/16, 8/16 },
}

local digiline = {
	receptor = {},
	effector = {
		action = function(pos, node, channel, msg)
			msg = clean_and_weigh_digiline_message(msg)
			run(pos, {type = "digiline", channel = channel, msg = msg})
		end
	}
}

local function get_program(pos)
	local meta = minetest.get_meta(pos)
	return meta:get_string("code")
end

local function set_program(pos, code)
	reset(pos)
	reset_meta(pos, code)
	local err = run(pos, {type="program"})
	if err then
		reset_meta(pos, code, err)
		return false, err
	end
	return true
end

local function on_receive_fields(pos, form_name, fields, sender)
	if not fields.program then
		return
	end
	local name = sender:get_player_name()
	if minetest.is_protected(pos, name) and not minetest.check_player_privs(name, {protection_bypass=true}) then
		minetest.record_protection_violation(pos, name)
		return
	end
	local ok, err = set_program(pos, fields.code)
	if not ok then
		-- it's not an error from the server perspective
		minetest.log("action", "Lua controller programming error: " .. err)
	end
end

for a = 0, 1 do -- 0 = off  1 = on
for b = 0, 1 do
for c = 0, 1 do
for d = 0, 1 do
	local cid = tostring(d)..tostring(c)..tostring(b)..tostring(a)
	local node_name = BASENAME..cid
	local top = "jeija_luacontroller_top.png"
	if a == 1 then
		top = top.."^jeija_luacontroller_LED_A.png"
	end
	if b == 1 then
		top = top.."^jeija_luacontroller_LED_B.png"
	end
	if c == 1 then
		top = top.."^jeija_luacontroller_LED_C.png"
	end
	if d == 1 then
		top = top.."^jeija_luacontroller_LED_D.png"
	end

	local groups
	if a + b + c + d ~= 0 then
		groups = {dig_immediate=2, not_in_creative_inventory=1, overheat = 1}
	else
		groups = {dig_immediate=2, overheat = 1}
	end

	output_rules[cid] = {}
	input_rules[cid] = {}
	if a == 1 then table.insert(output_rules[cid], rules.a) end
	if b == 1 then table.insert(output_rules[cid], rules.b) end
	if c == 1 then table.insert(output_rules[cid], rules.c) end
	if d == 1 then table.insert(output_rules[cid], rules.d) end

	if a == 0 then table.insert( input_rules[cid], rules.a) end
	if b == 0 then table.insert( input_rules[cid], rules.b) end
	if c == 0 then table.insert( input_rules[cid], rules.c) end
	if d == 0 then table.insert( input_rules[cid], rules.d) end

	local mesecons = {
		effector = {
			rules = input_rules[cid],
			action_change = function (pos, _, rule_name, new_state)
				update_real_port_states(pos, rule_name, new_state)
				run(pos, {type=new_state, pin=rule_name})
			end,
		},
		receptor = {
			state = mesecon.state.on,
			rules = output_rules[cid]
		},
		luacontroller = {
			get_program = get_program,
			set_program = set_program,
		},
	}

	minetest.register_node(node_name, {
		description = "Luacontroller",
		drawtype = "nodebox",
		tiles = {
			top,
			"jeija_microcontroller_bottom.png",
			"jeija_microcontroller_sides.png",
			"jeija_microcontroller_sides.png",
			"jeija_microcontroller_sides.png",
			"jeija_microcontroller_sides.png"
		},
		inventory_image = top,
		paramtype = "light",
		is_ground_content = false,
		groups = groups,
		drop = BASENAME.."0000",
		sunlight_propagates = true,
		selection_box = selection_box,
		node_box = node_box,
		on_construct = reset_meta,
		on_receive_fields = on_receive_fields,
		sounds = default.node_sound_stone_defaults(),
		mesecons = mesecons,
		digiline = digiline,
		-- Virtual portstates are the ports that
		-- the node shows as powered up (light up).
		virtual_portstates = {
			a = a == 1,
			b = b == 1,
			c = c == 1,
			d = d == 1,
		},
		after_dig_node = function (pos, node)
			mesecon.do_cooldown(pos)
			mesecon.receptor_off(pos, output_rules)
		end,
		is_luacontroller = true,
		on_blast = mesecon.on_blastnode,
	})
end
end
end
end

------------------------------
-- Overheated Luacontroller --
------------------------------

minetest.register_node(BASENAME .. "_burnt", {
	drawtype = "nodebox",
	tiles = {
		"jeija_luacontroller_burnt_top.png",
		"jeija_microcontroller_bottom.png",
		"jeija_microcontroller_sides.png",
		"jeija_microcontroller_sides.png",
		"jeija_microcontroller_sides.png",
		"jeija_microcontroller_sides.png"
	},
	inventory_image = "jeija_luacontroller_burnt_top.png",
	is_burnt = true,
	paramtype = "light",
	is_ground_content = false,
	groups = {dig_immediate=2, not_in_creative_inventory=1},
	drop = BASENAME.."0000",
	sunlight_propagates = true,
	selection_box = selection_box,
	node_box = node_box,
	on_construct = reset_meta,
	on_receive_fields = on_receive_fields,
	sounds = default.node_sound_stone_defaults(),
	virtual_portstates = {a = false, b = false, c = false, d = false},
	mesecons = {
		effector = {
			rules = mesecon.rules.flat,
			action_change = function(pos, _, rule_name, new_state)
				update_real_port_states(pos, rule_name, new_state)
			end,
		},
	},
	on_blast = mesecon.on_blastnode,
})

------------------------
-- Craft Registration --
------------------------

minetest.register_craft({
	output = BASENAME.."0000 2",
	recipe = {
		{'mesecons_materials:silicon', 'mesecons_materials:silicon', 'group:mesecon_conductor_craftable'},
		{'mesecons_materials:silicon', 'mesecons_materials:silicon', 'group:mesecon_conductor_craftable'},
		{'group:mesecon_conductor_craftable', 'group:mesecon_conductor_craftable', ''},
	}
})