dns_server.lua

rednet.open("right")

print("DNS server started")

local dnsTable = {}

local function registerComputer(name, id)
    dnsTable[name] = id
    print("Registation successful")
    print("PC: " .. name .. " ID: " .. id)
end


local function isNameRegistered(name)
    return dnsTable[name] ~= nil
end


local function getComputerID(name)
    return dnsTable[name]
end


local function getAllComputers()
    return dnsTable
end


while true do
    local senderID, message, protocol = rednet.receive()
    local data = textutils.unserialise(message)

    if protocol == "dns_register" then
        if data and data.name and data.id then
            registerComputer(data.name, data.id)
            rednet.send(senderID, "Registation has been successful", "dns_ack")
        else
            rednet.send(SenderID, "Registration fail", "dns_ack")
        end
    elseif protocol == "dns_list" then
        local allComputers = getAllComputers()
        local listMessage = textutils.serialize(allComputers)
        rednet.send(senderID, listMessage, "dns_list_response")
    end
end