net.lua

local c = require("component")
local term = require("term")
local fs = require("filesystem")
local shell = require("shell")
local event = require("event")
local s = require("serialization")
local text = require("text")
local m
local gpu
local logged = false

local port = 121

term.clear()

if not c.isAvailable("gpu") then
  c.computer.beep(1500,2)
  os.exit()
else
  gpu = c.gpu
end

if c.isAvailable("modem") then
  if c.isAvailable("tunnel") then
    print("Linked card and wireless card discovered! Use Linked[1] or Wireless[2]?")
    local valid = false
    while not valid do
      local choice = io.read()
      if choice == "1" then
        print("Linked card selected for network")
        m = c.tunnel
        valid = true
        mode = "tunnel"
      elseif choice == "2" then
        print("Wireless card selected for network")
        m = c.modem
        m.open(port)
        mode = "wireless"
        valid = true
      else
        print("Invalid input. please enter [1] or [2].")
      end
    end
  else
    m = c.modem
    mode = "wireless"
    m.open(port)
    print("Wireless card selected for network")
  end
elseif c.isAvailable("tunnel") then
  m = c.tunnel
  mode = "tunnel"
  print("Linked card selected for network")
end

function ping(time)
  if mode == "wireless" then
    print("sending wireless request")
    m.broadcast(port, s.serialize({"ping"}))
  elseif mode == "tunnel" then
    print("Sending linked request")
    m.send(s.serialize({"ping"}))
  end

  local Type, _, _, _, _, message = event.pull(10,"modem_message")
  if not Type then
    print("No response from server, check server is online and you are in range")
    os.exit()
  elseif message == "pong" then
    print("Response recieved!")
  end
end

function login(time, user)
  if mode == "wireless" then
    m.broadcast(port, s.serialize(user))
  elseif mode == "tunnel" then
    m.send(s.serialize(user))
  end

  local Type, _, _, _, _, message = event.pull(10,"modem_message")
  if not Type then
    print("\nRequest timed out.")
    os.exit()
  elseif message == "valid" then
    print("\nCredentials valid!")
    logged = true
  elseif message == "invalid" then
    print("\nCredentials invalid!")
  end
end

gpu.setForeground(0xFF00FF)
print("Attempting to contact authorisation servers.")
ping(10)
gpu.setForeground(0x00FF00)

while not logged do
  print("Enter username: ")
  local x, y = term.getCursor()
  term.setCursor(17, y-1)
  local username = io.read()

  print("\nEnter Password: ")
  local x, y = term.getCursor()
  term.setCursor(17, y-1)
  local password = text.trim(term.read(nil, false, nil, "*"))

  local user = {username, password}
  login(5, user)
end

while true do
  while logged do
    gpu.setForeground(0xFF0000)
    local wd = shell.getWorkingDirectory()
    print(wd.." # ")
    gpu.setForeground(0xFFFFFF)
    local x, y = term.getCursor()
    term.setCursor(string.len(wd)+4, y-1)

    local input = io.read()
    os.execute(input)
  end
end