(Visual FoxPro) 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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LOCAL loDns
LOCAL loJson
LOCAL lnSuccess
LOCAL lcName
LOCAL lnTtl
LOCAL lnFlags
LOCAL lcTag
LOCAL lcValue
LOCAL i
LOCAL lnCount_i

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Dns')
loDns = CreateObject('Chilkat.Dns')

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.JsonObject')
loJson = CreateObject('Chilkat.JsonObject')
loJson.EmitCompact = 0

lnSuccess = loDns.Query("CAA","zoom.us",loJson)
IF (lnSuccess = 0) THEN
    ? loDns.LastErrorText
    RELEASE loDns
    RELEASE loJson
    CANCEL
ENDIF

? loJson.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

i = 0
lnCount_i = loJson.SizeOfArray("answer.caa")
DO WHILE i < lnCount_i
    loJson.I = i
    lcName = loJson.StringOf("answer.caa[i].name")
    lnTtl = loJson.IntOf("answer.caa[i].ttl")
    lnFlags = loJson.IntOf("answer.caa[i].flags")
    lcTag = loJson.StringOf("answer.caa[i].tag")
    lcValue = loJson.StringOf("answer.caa[i].value")
    i = i + 1
ENDDO

RELEASE loDns
RELEASE loJson