125 lines
2.6 KiB
Lua
125 lines
2.6 KiB
Lua
local computer = require "computer"
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local event = require "event"
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local net = {}
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net.mtu = 4096
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net.streamdelay = 60
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net.minport = 32768
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net.maxport = 65535
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net.openports = {}
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function net.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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function net.usend(to,port,data,npID)
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computer.pushSignal("net_send",0,to,port,data,npID)
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end
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function net.rsend(to,port,data)
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local pid = net.genPacketID()
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computer.pushSignal("net_send",1,to,port,data,pid)
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repeat
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_,rpid = event.pull("net_ack")
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until rpid == pid
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end
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-- ordered packet delivery, layer 4?
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function net.send(to,port,ldata)
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local tdata = {}
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if ldata:len() > net.mtu then
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for i = 1, ldata:len(), net.mtu do
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tdata[#tdata+1] = ldata:sub(1,net.mtu)
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ldata = ldata:sub(net.mtu+1)
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end
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else
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tdata = {ldata}
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end
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for k,v in ipairs(tdata) do
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net.rsend(to,port,v)
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end
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end
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-- socket stuff, layer 5?
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local function cwrite(self,data)
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if self.state == "open" then
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net.send(self.addr,self.port,data)
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end
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end
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local function cread(self,length)
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local rdata = ""
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rdata = self.rbuffer:sub(1,length)
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self.rbuffer = self.rbuffer:sub(length+1)
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return rdata
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end
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local function socket(addr,port,sclose) -- todo, add remote closing of sockets
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local conn = {}
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conn.addr,conn.port = addr,tonumber(port)
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conn.rbuffer = ""
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conn.write = cwrite
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conn.read = cread
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conn.state = "open"
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local function listener(_,f,p,d)
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if f == conn.addr and p == conn.port then
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if d == sclose then
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conn:close()
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else
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conn.rbuffer = conn.rbuffer .. d
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end
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end
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end
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event.listen("net_msg",listener)
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function conn.close(self)
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event.ignore("net_msg",listener)
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conn.state = "closed"
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net.rsend(addr,port,sclose)
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end
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return conn
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end
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function net.open(to,port)
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net.rsend(to,port,"openstream")
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local st = computer.uptime()+net.streamdelay
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local est = false
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while true do
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_,from,rport,data = event.pull("net_msg")
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if to == from and rport == port then
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if tonumber(data) then
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est = true
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end
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break
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end
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if st < computer.uptime() then
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return nil, "timed out"
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end
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end
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if not est then
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return nil, "refused"
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end
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data = tonumber(data)
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sclose = ""
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repeat
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_,from,nport,sclose = event.pull("net_msg")
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until from == to and nport == data
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return socket(to,data,sclose)
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end
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function net.listen(port)
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repeat
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_, from, rport, data = event.pull("net_msg")
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until rport == port
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local nport = math.random(net.minport,net.maxport)
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local sclose = net.genPacketID()
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net.rsend(from,rport,tostring(nport))
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net.rsend(from,nport,sclose)
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return socket(from,nport,sclose)
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end
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return net
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