Lua Requires Chilkat v9.5.0.96+

DNS Query MX Records

See more DNS Examples

Shows how to perform a DNS query to retrieve MX records. Lua

local chilkat = require("chilkat")

local dns = chilkat.Dns.new()

local json = chilkat.JsonObject.new()
json.emit_compact = false

local success = dns:query("MX", "somebody@gmail.com", json)
if not success then
    print(dns.last_error_text)
    return
end

print(json:emit())

-- Sample response.
-- Parsing code below..

-- -------------------------------------------------------------------------------
-- Note: Chilkat will return the results sorted by "pref" from lowest to highest.
-- -------------------------------------------------------------------------------

-- {
--   "answer": {
--     "mx": [
--       {
--         "name": "gmail.com",
--         "ttl": 491,
--         "pref": 5,
--         "domain": "gmail-smtp-in.l.google.com"
--       },
--       {
--         "name": "gmail.com",
--         "ttl": 491,
--         "pref": 10,
--         "domain": "alt1.gmail-smtp-in.l.google.com"
--       },
--       {
--         "name": "gmail.com",
--         "ttl": 491,
--         "pref": 20,
--         "domain": "alt2.gmail-smtp-in.l.google.com"
--       },
--       {
--         "name": "gmail.com",
--         "ttl": 491,
--         "pref": 30,
--         "domain": "alt3.gmail-smtp-in.l.google.com"
--       },
--       {
--         "name": "gmail.com",
--         "ttl": 491,
--         "pref": 40,
--         "domain": "alt4.gmail-smtp-in.l.google.com"
--       }
--     ]
--   }
-- }

-- Use this online tool to generate parsing code from sample JSON:
-- Generate Parsing Code from JSON

local name = ""
local ttl = 0
local pref = 0
local domain = ""

local i = 0
local count_i = json:size_of_array("answer.mx")
while i < count_i do
    json.i = i
    name = json:string_of("answer.mx[i].name")
    ttl = json:int_of("answer.mx[i].ttl")
    pref = json:int_of("answer.mx[i].pref")
    domain = json:string_of("answer.mx[i].domain")
    i = i + 1
end