DNS

local s = rs.getSides()
for each,side in pairs(s) do
  if peripheral.isPresent(side) and peripheral.getType(side) == "modem" then
    rednet.open(side)
  end
end
while true do
  local event, sender, message, id = os.pullEvent("rednet_message")
  term.clear()
  term.setCursorPos(1,1)
  print("Received request from "..id.." to access "..message)
  rednet.send(1,message,id)
  print("Sent request to server")
  local id, packet, proto = rednet.receive(5)
  if not id then
    print("Packet was not received. Oh dear")
    rednet.send(sender,"error",id)
  else
    print("Received packet. Sending packet")
    rednet.send(sender,packet,id)
  end
end