(VB.NET) DNS Query CAA Records

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

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

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Dim dns As New Chilkat.Dns

Dim json As New Chilkat.JsonObject
json.EmitCompact = False

Dim success As Boolean = dns.Query("CAA","zoom.us",json)
If (success = False) Then
    Debug.WriteLine(dns.LastErrorText)
    Exit Sub
End If


Debug.WriteLine(json.Emit())

' Sample response.
' Parsing code below..

' {
'   "answer": {
'     "caa": [
'       {
'         "name": "zoom.us",
'         "ttl": 300,
'         "flags": 0,
'         "tag": "iodef",
'         "value": "mailto:security@zoom.us"
'       },
'       {
'         "name": "zoom.us",
'         "ttl": 300,
'         "flags": 0,
'         "tag": "issue",
'         "value": "amazon.com"
'       },
'       {
'         "name": "zoom.us",
'         "ttl": 300,
'         "flags": 0,
'         "tag": "issue",
'         "value": "digicert.com"
'       },
'       {
'         "name": "zoom.us",
'         "ttl": 300,
'         "flags": 0,
'         "tag": "issue",
'         "value": "godaddy.com"
'       },
'       {
'         "name": "zoom.us",
'         "ttl": 300,
'         "flags": 0,
'         "tag": "issue",
'         "value": "letsencrypt.org"
'       },
'       {
'         "name": "zoom.us",
'         "ttl": 300,
'         "flags": 0,
'         "tag": "issue",
'         "value": "pki.goog"
'       },
'       {
'         "name": "zoom.us",
'         "ttl": 300,
'         "flags": 0,
'         "tag": "issue",
'         "value": "sectigo.com"
'       }
'     ]
'   }
' }


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


Dim name As String
Dim ttl As Integer
Dim flags As Integer
Dim tag As String
Dim value As String

Dim i As Integer = 0
Dim count_i As Integer = json.SizeOfArray("answer.caa")
While i < count_i
    json.I = i
    name = json.StringOf("answer.caa[i].name")
    ttl = json.IntOf("answer.caa[i].ttl")
    flags = json.IntOf("answer.caa[i].flags")
    tag = json.StringOf("answer.caa[i].tag")
    value = json.StringOf("answer.caa[i].value")
    i = i + 1
End While