ftp

tArgs = {...}
local function printUsage()
  print("Usage: ")
  print(shell.getRunningProgram().." send <file> <id>")
  print(shell.getRunningProgram().." receive <id>")
end

local function receive()
  id, msg = rednet.receive(10)
  if msg == nil then
    error("Connection timed out.")
  else
    if id == tArgs[2] then
      local data = textutils.unserialize(msg)
      local handle = fs.open(data[1], "w")
      handle.write(data[2])
      handle.close()
      print("File saved as "..data[1])
      error()
    end
  end
end

local function send()
  local handle = fs.open(tArgs[2], "r")
  local handleData = handle.readAll()
  local data = {}
  table.insert(data, 1, tArgs[2])
  table.insert(data, 2, handleData)
  local msg = textutils.serialize(data)
  rednet.send(tonumber(tArgs[3]), msg)
end

local function openAll()
  for _,v in pairs(rs.getSides()) do
    if peripheral.isPresent(v) and peripheral.getType(v) == "modem" then
      rednet.open(v)
    end
  end
end

if #tArgs < 2 then
  printUsage()
  error()
end

openAll()

if tArgs[1] == "send" then send() elseif tArgs[1] == "receive" then receive() end