mirror of
https://github.com/osmarks/random-stuff
synced 2024-12-28 02:50:33 +00:00
65 lines
2.5 KiB
Lua
65 lines
2.5 KiB
Lua
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local eeprom = component.proxy(component.list "eeprom"())
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local wlan = component.proxy(component.list "modem"())
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local comp = component.proxy(component.list "computer"())
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local function serialize(a)local b=type(a)if b=="number"then return tostring(a)elseif b=="string"then return ("%q"):format(a)elseif b=="table"then local c="{"for d,e in pairs(a)do c=c..string.format("[%s]=%s,",serialize(d),serialize(e))end;return c.."}"elseif b=="boolean"then return tostring(a)else return("%q"):format(tostring(a))end end
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local function unserialize(a) local fn, e = load("return "..a:gsub("functio".."n", ""), "@deser", "t", {}) if not fn then return false, e end return fn() end
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local a=string.byte;local function crc32(c)local d,e,f;e=0xffffffff;for g=1,#c do d=a(c,g)e=e~d;for h=1,8 do f=-(e&1);e=(e>>1)~(0xedb88320&f)end end;return(~e)&0xffffffff end
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local conf, e = unserialize(eeprom.getData())
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if e then error("Config parse error: " .. e) end
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wlan.open(2048)
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wlan.open(2049)
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local function respond(main, auth)
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local data, e = unserialize(main)
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if not data then error("unserialization: " .. e) end
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if type(data) ~= "table" then error "command format invalid" end
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local authed = false
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if data.time and auth then
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local timediff = math.abs(os.time() - data.time)
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if timediff > 1000 then error "tdiff too high" end
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local vauth = crc32(main .. conf.psk)
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if auth ~= vauth then error "auth invalid" end
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authed = true
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end
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local ctype = data[1]
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if ctype == "ping" then return conf.uid end
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if authed then
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if ctype == "reflash" and data[2] then
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eeprom.set(data[2])
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for i = 1, 5 do
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comp.beep(800, 0.2)
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comp.beep(1200, 0.2)
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end
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return #data[2]
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elseif ctype == "setpos" and data[2] and data[3] then
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if data[2] == conf.uid then
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conf.pos = data[3]
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eeprom.setData(serialize(conf))
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eeprom.setLabel("GPS"..conf.uid)
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return true
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end
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return "ignoring"
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end
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end
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error("invalid command (auth: " .. tostring(authed) .. ")")
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end
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while true do
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local ev, _, from, port, distance, m1, m2 = computer.pullSignal()
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if ev == "modem_message" then
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if port == 2048 and m1 == "PING" then
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if conf.pos then
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wlan.broadcast(2047, table.unpack(conf.pos))
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else
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comp.beep(400, 2)
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end
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elseif port == 2049 and distance < 8 then
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comp.beep(1000, 0.5)
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local ok, res = pcall(respond, m1, m2)
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wlan.broadcast(2050, conf.uid, ok, serialize(res))
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if not ok then comp.beep(1500, 2) end
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end
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end
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end
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