Perl

DNS Query MX Records

See more DNS Examples

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

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

Perl

use chilkat();

$success = 0;

$dns = chilkat::CkDns->new();

$json = chilkat::CkJsonObject->new();
$json->put_EmitCompact(0);

$success = $dns->Query("MX",'somebody@gmail.com',$json);
if ($success == 0) {
    print $dns->lastErrorText() . "\r\n";
    exit;
}

print $json->emit() . "\r\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;
}