sgdns

for i,v in pairs(rs.getSides()) do
  if peripheral.getType(v) == "modem" then
    rednet.open(v)
  end
end

sgdns = {id=815}

local function check(var, name)
  if not var then
    error(name.." Required!", 2)
  end
  return tostring(var)
end

function sgdns.send(...)
  rednet.send(sgdns.id, table.concat({...}, " "))
  local _, resp = rednet.receive(0.1)
  return resp or "No Response"
end

function sgdns.get(name)
  return sgdns.send(
    "GET",
    check(name, "Name")
  )
end

function sgdns.register(name, val, pass)
  return sgdns.send(
    "REG",
    check(name, "Name"),
    check(val, "Value"),
    check(pass, "Password")
  )
end

function sgdns.delete(name, pass)
  return sgdns.send(
    "DEL",
    check(name, "Name"),
    check(pass, "Password")
  )
end

function sgdns.modify(name, val, pass)
  return sgdns.send(
    "MOD",
    check(name, "Name"),
    check(val, "Value"),
    check(pass, "Password")
  )
end