275 lines
6.5 KiB
Lua
275 lines
6.5 KiB
Lua
--[[
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packet format:
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packetID: random string to differentiate
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packetType:
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- 0: unreliable
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- 1: reliable, requires ack
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- 2: ack packet
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destination: end destination hostname
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sender: original sender of packet
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data: the actual packet data, duh.
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]]--
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local listeners = {}
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local timers = {}
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local cfg = {}
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local event = require "event"
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local component = require "component"
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local computer = require "computer"
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local serial = require "serialization"
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local hostname = computer.address():sub(1,8)
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local modems = {}
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local pid = nil
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cfg.debug = false
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cfg.port = 4096
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cfg.retry = 10
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cfg.retrycount = 3
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cfg.route = true
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--[[
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LKR format:
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address {
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local hardware address
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remote hardware address
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time last received
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}
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]]--
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cfg.sroutes = {}
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local rcache = setmetatable({},{__index=cfg.sroutes})
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cfg.rctime = 15
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--[[
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packet queue format:
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{
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packetID,
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packetType
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destination,
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data,
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timestamp,
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attempts
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}
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]]--
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local pqueue = {}
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-- packet cache: [packet ID]=uptime
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local pcache = {}
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cfg.pctime = 30
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local function dprint(...)
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if cfg.debug then
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print(...)
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end
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end
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local function saveconfig()
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local f = io.open("/boot/cfg/minitel.cfg","wb")
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if f then
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f:write(serial.serialize(cfg))
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f:close()
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end
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end
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local function loadconfig()
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local f = io.open("/boot/cfg/minitel.cfg","rb")
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if f then
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local newcfg = serial.unserialize(f:read("*a"))
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f:close()
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for k,v in pairs(newcfg) do
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cfg[k] = v
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end
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else
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saveconfig()
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end
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end
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function start()
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loadconfig()
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hostname = os.getenv("HOSTNAME") or computer.address():sub(1,8)
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print("Hostname: "..hostname)
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if pid then return false end
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modems={}
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for a,t in component.list("modem") do
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modems[#modems+1] = component.proxy(a)
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end
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for k,v in ipairs(modems) do
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v.open(cfg.port)
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print("Opened port "..cfg.port.." on "..v.address)
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end
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for a,t in component.list("tunnel") do
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modems[#modems+1] = component.proxy(a)
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end
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local function genPacketID()
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local npID = ""
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for i = 1, 16 do
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npID = npID .. string.char(math.random(32,126))
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end
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return npID
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end
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local function sendPacket(packetID,packetType,dest,sender,vPort,data,repeatingFrom)
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if rcache[dest] then
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dprint("Cached", rcache[dest][1],"send",rcache[dest][2],cfg.port,packetID,packetType,dest,sender,vPort,data)
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if component.type(rcache[dest][1]) == "modem" then
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component.invoke(rcache[dest][1],"send",rcache[dest][2],cfg.port,packetID,packetType,dest,sender,vPort,data)
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elseif component.type(rcache[dest][1]) == "tunnel" then
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component.invoke(rcache[dest][1],"send",packetID,packetType,dest,sender,vPort,data)
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end
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else
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dprint("Not cached", cfg.port,packetID,packetType,dest,sender,vPort,data)
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for k,v in pairs(modems) do
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-- do not send message back to the wired or linked modem it came from
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-- the check for tunnels is for short circuiting `v.isWireless()`, which does not exist for tunnels
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if v.address ~= repeatingFrom or (v.type ~= "tunnel" and v.isWireless()) then
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if v.type == "modem" then
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v.broadcast(cfg.port,packetID,packetType,dest,sender,vPort,data)
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v.send(packetID,packetType,dest,sender,vPort,data)
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end
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end
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end
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end
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end
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local function pruneCache()
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for k,v in pairs(rcache) do
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dprint(k,v[3],computer.uptime())
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if v[3] < computer.uptime() then
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rcache[k] = nil
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dprint("pruned "..k.." from routing cache")
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end
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end
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for k,v in pairs(pcache) do
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if v < computer.uptime() then
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pcache[k] = nil
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dprint("pruned "..k.." from packet cache")
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end
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end
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end
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local function checkPCache(packetID)
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dprint(packetID)
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for k,v in pairs(pcache) do
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dprint(k)
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if k == packetID then return true end
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end
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return false
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end
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local function processPacket(_,localModem,from,pport,_,packetID,packetType,dest,sender,vPort,data)
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pruneCache()
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if pport == cfg.port or pport == 0 then -- for linked cards
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dprint(cfg.port,vPort,packetType,dest)
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if checkPCache(packetID) then return end
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if dest == hostname then
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if packetType == 1 then
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sendPacket(genPacketID(),2,sender,hostname,vPort,packetID)
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end
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if packetType == 2 then
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dprint("Dropping "..data.." from queue")
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pqueue[data] = nil
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computer.pushSignal("net_ack",data)
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end
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if packetType ~= 2 then
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computer.pushSignal("net_msg",sender,vPort,data)
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end
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elseif dest:sub(1,1) == "~" then -- broadcasts start with ~
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computer.pushSignal("net_broadcast",sender,vPort,data)
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elseif cfg.route then -- repeat packets if route is enabled
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sendPacket(packetID,packetType,dest,sender,vPort,data,localModem)
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end
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if not rcache[sender] then -- add the sender to the rcache
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dprint("rcache: "..sender..":", localModem,from,computer.uptime())
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rcache[sender] = {localModem,from,computer.uptime()+cfg.rctime}
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end
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if not pcache[packetID] then -- add the packet ID to the pcache
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pcache[packetID] = computer.uptime()+cfg.pctime
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end
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end
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end
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local function queuePacket(_,ptype,to,vPort,data,npID)
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npID = npID or genPacketID()
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if to == hostname or to == "localhost" then
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computer.pushSignal("net_msg",to,vPort,data)
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computer.pushSignal("net_ack",npID)
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return
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end
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pqueue[npID] = {ptype,to,vPort,data,0,0}
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dprint(npID,table.unpack(pqueue[npID]))
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end
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local function packetPusher()
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for k,v in pairs(pqueue) do
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if v[5] < computer.uptime() then
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dprint(k,v[1],v[2],hostname,v[3],v[4])
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sendPacket(k,v[1],v[2],hostname,v[3],v[4])
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if v[1] ~= 1 or v[6] == cfg.retrycount then
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pqueue[k] = nil
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else
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pqueue[k][5]=computer.uptime()+cfg.retry
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pqueue[k][6]=pqueue[k][6]+1
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end
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end
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end
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end
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listeners["modem_message"]=processPacket
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listeners["net_send"]=queuePacket
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listeners["net_ack"]=dprint
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pid=os.spawn(function()
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while true do
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local ev = {coroutine.yield()}
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packetPusher()
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pruneCache()
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if listeners[ev[1]] then
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pcall(listeners[ev[1]],table.unpack(ev))
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end
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end
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end,"minitel")
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print("Started Minitel daemon: "..tostring(pid))
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return pid
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end
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function stop()
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if pid then
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os.kill(pid)
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pid = nil
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return true
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else
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return false
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end
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end
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function set(k,v)
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if type(cfg[k]) == "string" then
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cfg[k] = v
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elseif type(cfg[k]) == "number" then
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cfg[k] = tonumber(v)
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elseif type(cfg[k]) == "boolean" then
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if v:lower():sub(1,1) == "t" then
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cfg[k] = true
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else
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cfg[k] = false
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end
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end
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print("cfg."..k.." = "..tostring(cfg[k]))
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saveconfig()
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end
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function set_route(to,laddr,raddr)
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cfg.sroutes[to] = {laddr,raddr,0}
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saveconfig()
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end
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function del_route(to)
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cfg.sroutes[to] = nil
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saveconfig()
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end
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return {start=start,stop=stop,set=set,set_route=set_route,del_route=del_route}
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