izaya/OC-Minitel
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Check network device MTUs and split packets accordingly depending on capacity and overhead.

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Tally of packet overhead:
 - 16 bytes packet ID
 - 8 bytes type
 - N bytes dest
 - N bytes source
 - 8 bytes port
 - N bytes data
 - 6*2 bytes network card overhead
This commit is contained in:
Izaya 2024-03-16 12:30:25 +10:00
parent 60931734e3
commit 071a692f11
1 changed files with 12 additions and 10 deletions
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22
OpenOS/usr/lib/minitel.lua
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@ -1,12 +1,18 @@
local computer = require "computer" local computer = require "computer"
local event = require "event" local event = require "event"
local net = {} local net = {}
net.mtu = 4096 net.mtu = 8192
net.streamdelay = 30 net.streamdelay = 30
net.minport = 32768 net.minport = 32768
net.maxport = 65535 net.maxport = 65535
net.openports = {} net.openports = {}
for k,v in pairs(computer.getDeviceInfo()) do
if v.class == "network" then
net.mtu = math.min(net.mtu, tonumber(v.capacity))
end
end
function net.genPacketID() function net.genPacketID()
local npID = "" local npID = ""
for i = 1, 16 do for i = 1, 16 do
@ -31,17 +37,13 @@ function net.rsend(to,port,data,block)
end end
-- ordered packet delivery, layer 4? -- ordered packet delivery, layer 4?
function net.send(to,port,ldata) function net.send(to,port,ldata)
local tdata = {} local tdata, hsize = {}, 44 + #(os.getenv("HOSTNAME") or computer.address():sub(1,8)) + #to
if ldata:len() > net.mtu then while hsize+#ldata > net.mtu do
for i = 1, ldata:len(), net.mtu do tdata[#tdata+1] = ldata:sub(1, net.mtu - hsize)
tdata[#tdata+1] = ldata:sub(1,net.mtu) ldata = ldata:sub(#tdata[#tdata]+1)
ldata = ldata:sub(net.mtu+1)
end
else
tdata = {ldata}
end end
tdata[#tdata+1] = ldata
for k,v in ipairs(tdata) do for k,v in ipairs(tdata) do
if not net.rsend(to,port,v) then return false end if not net.rsend(to,port,v) then return false end
end end