(Ruby) DNS Query MX Records

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

Note: This example requires Chilkat v9.5.0.96 or later.

Chilkat Ruby Downloads install from rubygems.org gem install chilkat or download... Ruby Library for Windows, MacOS, Linux, Alpine Linux

require 'chilkat'

dns = Chilkat::CkDns.new()

json = Chilkat::CkJsonObject.new()
json.put_EmitCompact(false)

success = dns.Query("MX","somebody@gmail.com",json)
if (success == false)
    print dns.lastErrorText() + "\n";
    exit
end

print json.emit() + "\n";

# 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

i = 0
count_i = json.SizeOfArray("answer.mx")
while i < count_i
    json.put_I(i)
    name = json.stringOf("answer.mx[i].name")
    ttl = json.IntOf("answer.mx[i].ttl")
    pref = json.IntOf("answer.mx[i].pref")
    domain = json.stringOf("answer.mx[i].domain")
    i = i + 1
end