startup

rednet.open("back")
rednet.broadcast("SERVER LOCATE")
local id, message = rednet.receive(5)
if not message then
  error("No server located. Server may have crashed. (ERR: CALL_TIMEOUT)")
end
serverid = id
print("Located Server: ", serverid)
print("Client starting")
write("Username: ")
username = read()
write("Password: ")
password = read("*")
rednet.send(serverid, "login_start")
local id, message = rednet.receive()
if message == "AUTHENTICATE NOW" then
  rednet.send(serverid, username)
  rednet.send(serverid, password)
  id, session = rednet.receive()
  if session == "err" then
    error("Incorrect username or password (ERR: Server 404 (usr/pass not found))")
  end
  print("Got session. ", session)
  id, message = rednet.receive()
  print(message)
  print("When you're finished with the computer. Please type 'logout'")
end
while true do
  write("> ")
  message = read()
  if message == "logout" or message == "exit" or message == "shutdown" then
    os.shutdown()
  end
  if message == "upgrade" then
    shell.run("rm startup")
    shell.run("pastebin get 1VHszN6d startup")
    os.reboot()
  end
  if message == "chat" then
    shell.run("chat join smyd ", username)
  end
  if message == "power" then
    shell.run("power")
  end
end