forked from osmarks/potatOS
87 lines
3.0 KiB
Lua
87 lines
3.0 KiB
Lua
--[[
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For reasons outlined here (https://wiki.computercraft.cc/Network_security), Rednet is not really a good choice for new networking setups, apart from its capability to relay messages (obsoleted by ender modems).
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However, if you do want to keep using it, without the risk of it crashing due to the exploits I have identified (https://pastebin.com/pJnfSDcL), you can use this convenient, patched repeater. It doesn't alleviate the fundamental issues with Rednet, though.
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]]
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-- Find modems
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local modems = {peripheral.find "modem"}
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local comp_ID = os.getComputerID()
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print(("%d modem(s) found"):format(#modems))
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local function for_each_modem(fn)
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for _, m in pairs(modems) do
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fn(m)
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end
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end
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local function open(channel)
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for_each_modem(function(m) m.open(channel) end)
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end
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local function close(channel)
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for_each_modem(function(m) m.close(channel) end)
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end
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-- Open channels
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open(rednet.CHANNEL_REPEAT)
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-- Main loop (terminate to break)
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local ok, error = pcall(function()
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local received_messages = {}
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local received_message_timers = {}
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local transmitted_messages = 0
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while true do
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local event, modem, channel, reply_channel, message, distance = os.pullEvent()
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if event == "modem_message" then
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-- Got a modem message, rebroadcast it if it's a rednet thing
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if channel == rednet.CHANNEL_REPEAT and type(message) == "table" then
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local id = message.nMessageID -- unfortunately we must keep the stupid rednet identifiers SOMEWHERE...
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local recipient = message.nRecipient
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local route = message.route -- protocol extension
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if type(route) ~= "table" then route = { reply_channel } end
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table.insert(route, comp_ID)
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message.route = route
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if id and recipient and (type(id) == "number" or type(id) == "string") and type(recipient) == "number" and recipient >= 0 and recipient <= 65535 then
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if not received_messages[id] then
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-- Ensure we only repeat a message once per 30 seconds
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received_messages[id] = true
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received_message_timers[os.startTimer(30)] = id
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-- Send on all other open modems, to the target and to other repeaters
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for_each_modem(function(m)
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m.transmit(rednet.CHANNEL_REPEAT, reply_channel, message)
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m.transmit(recipient, reply_channel, message)
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end)
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-- Log the event
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transmitted_messages = transmitted_messages + 1
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term.clear()
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term.setCursorPos(1, 1)
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print(("%d message(s) repeated"):format(transmitted_messages))
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print(string.format("%s\nfrom %d to %s dist %d", tostring(message.message), reply_channel, tostring(recipient), tostring(distance) or "[n/a]"))
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end
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end
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end
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elseif event == "timer" then
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-- Got a timer event, use it to clear the message history
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local timer = modem
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local id = received_message_timers[timer]
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if id then
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received_message_timers[timer] = nil
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received_messages[timer] = nil
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end
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end
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end
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end)
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if not ok then
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printError(error)
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end
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-- Close channels
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close(rednet.CHANNEL_REPEAT) |