DataFlex

DNS Query CAA Records

See more DNS Examples

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

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

DataFlex

Use ChilkatAx-win32.pkg

Procedure Test
    Boolean iSuccess
    Handle hoDns
    Variant vJson
    Handle hoJson
    String sName
    Integer iTtl
    Integer iFlags
    String sTag
    String sValue
    Integer i
    Integer iCount_i
    String sTemp1

    Move False To iSuccess

    Get Create (RefClass(cComChilkatDns)) To hoDns
    If (Not(IsComObjectCreated(hoDns))) Begin
        Send CreateComObject of hoDns
    End

    Get Create (RefClass(cComChilkatJsonObject)) To hoJson
    If (Not(IsComObjectCreated(hoJson))) Begin
        Send CreateComObject of hoJson
    End
    Set ComEmitCompact Of hoJson To False

    Get pvComObject of hoJson to vJson
    Get ComQuery Of hoDns "CAA" "zoom.us" vJson To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoDns To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Get ComEmit Of hoJson To sTemp1
    Showln sTemp1

    // 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

    Move 0 To i
    Get ComSizeOfArray Of hoJson "answer.caa" To iCount_i
    While (i < iCount_i)
        Set ComI Of hoJson To i
        Get ComStringOf Of hoJson "answer.caa[i].name" To sName
        Get ComIntOf Of hoJson "answer.caa[i].ttl" To iTtl
        Get ComIntOf Of hoJson "answer.caa[i].flags" To iFlags
        Get ComStringOf Of hoJson "answer.caa[i].tag" To sTag
        Get ComStringOf Of hoJson "answer.caa[i].value" To sValue
        Move (i + 1) To i
    Loop



End_Procedure