dns.lua

rednet.open("left")
local ch= read()
if ch == "createnew" then
 print("Write here tld with dot! (.com): ")
 local tld = read()
 print("Write here domainname  (google): ")
 local domain = read()
 print("SERVER ID:")
 local id = tonumber(read())
 if not fs.exists("/disk/"..domain..tld) then
   local file
   file = fs.open("/disk/"..domain..tld, "w")
   file.writeLine(id)
   file.close()
   rednet.send(id, "dnsreg")
   print("Server "..id.." register OK! Domain: "..domain..tld)
 end
end
if ch == "startup" then
  print(os.getComputerID())
  while true do
    local error = false
    local senderId, message, protocol = rednet.receive()
    if protocol ~= nil then
      print("Protocol: "..protocol)
    else
      term.setTextColor(colors.red)
      print("SENT WIHOUT PROTOCOL!")
      term.setTextColor(colors.white)
    end
    if protocol ~= "jnet" then
        term.setTextColor(colors.red)
        print("ERROR: YOU ARE NOT USING JNET PROTOCOL")
        rednet.send(senderId, "term.setTextColor(colors.red) print('ERROR: YOU ARE NOT USING JNET PROTOCOL!')", "jnet")
        term.setTextColor(colors.white)
        error = true
    elseif (message == "dns.lua") or (message == "/disk/dns.lua") then
      term.setTextColor(colors.red)
      print("\nERROR: BLACKLISTED MESSAGE (dns.lua)")
      rednet.send(senderId, "term.setTextColor(colors.red) print('ERROR: BLACKLISTED MESSAGE (dns.lua)')", "jnet")
      term.setTextColor(colors.white)
      error = true
    elseif protocol == "jnet" then
      print("JNET PROTOCOL SERVER RESPONSE HANDLER")
      print("SENT BY: "..senderId..". Domain: "..message)
      if fs.exists("/disk/"..message) then
        local file = fs.open("/disk/"..message, "r")
        local id = tonumber(file.readLine())
        file.close()
        print("Sending data to "..id.." server. Domain "..message)
        rednet.send(id, senderId, "server.jnet")
        local ssenderId, smessage, sprotocol = rednet.receive()
        if sprotocol == "server.jnet" then
          rednet.send(senderId, smessage, "jnet")
          local file1 = fs.open("/disk/temp."..senderId, "w")
          file1.write(smessage)
          file1.close()
          print("DataGetFromServer: ".."/disk/temp:"..message.." . Sent to id: "..senderId)
        end
      else
        term.setTextColor(colors.red)
        print("ERROR: Cant resolve domain. Domain: "..message.." | ID: "..senderId.." | ")
        term.setTextColor(colors.white)
        rednet.send(senderId, "term.setTextColor(colors.red) print('ERROR: CANT RESOLVE DOMAIN NAME! check if misspelt?')")
      end
    else
      term.setTextColor(colors.red)
      print("UNEXPECTED ERROR!")
      term.setTextColor(colors.white)
      rednet.send(senderId, "term.setTextColor(colors.red) print('UNEXPECTED  ERROR. TELL YOU PROVAIDER!'","jnet")
    end
  end
end