startup

PORT   = 42690
REPLY  = 42691
SLOT   = "back"

print("")
print("------------")
print("IP-L0CC v0.1")
print("------------")
print("   client   ")
print("------------")
print("")

while true do
  tcp = peripheral.wrap(SLOT)
  if not tcp then
    print("ERROR: Modem not found at "..SLOT)
    break
  end

  if not auth then
    tcp.transmit(PORT,REPLY,"!AUTH")
    tcp.open(42691)

    local event,modemSide,senderChannel,
    replyChannel,message,senderDistance
    = os.pullEvent("modem_message")

    if message == "!IPL0CCYO!" then
      auth=true
      print("STATUS: Authenticated with server")
         break
    end
  end
end

while true do
  print("")
  print("Enter username:")
  userinput = read()
  tcp.transmit(PORT,REPLY,"USER="..userinput)

  local event,modemSize,senderChannel,
  replyChannel,message,senderDistance
  = os.pullEvent("modem_message")

  if message ~= "!YES" then
    print("Username does not exist")
  else
    user=userinput
    break
  end
end

while true do
  print("")
  print("Enter password:")
  passinput = read("*")
  tcp.transmit(PORT,REPLY,"PASS="..passinput)

  local event,modemSide,senderChannel,
  replyChannel,message,senderDistance
  = os.pullEvent("modem_message")

  if message ~= "!!YES" then
    print("Password is incorrect")
  else
    term.clear()
    print("Authentication successful")
    break
  end
end