Lucee Developer

I was actually surprised it was not in Coldfusion yet: the ability to do dns lookups. Since I'm the official Railo Extension Manager^®™, I saw it as an excellent chance to create a new custom tag: CFDNS.
But, as seems to happen with a lot of good ideas, someone else already thought of it. Just check www.cfdns.org :-/

The thing I could still do, was create the code to use it as a custom tag in Railo. I used the existing cfdns code with a few changes, and made a custom tag wrapper for it, and here it is: <CFDNS> for Railo!

Installation

You can install the custom tag by using your Railo server admin.

Go to your Server admin (default is http://localhost/railo-context/admin/server.cfm), click on Extension > Providers, and add the following url:

http://www.railodeveloper.com/ExtensionProvider.cfc

Then, go to Extension > Applications, and install the CFDNS custom tag.

Lastly, you have to restart Railo to be able to use the tag.

Usage

The tag has 3 main actions:

• GETADDRESS: Get IP address or CNAME value for hostname
• GETHOSTNAME: Get hostname for IP address
• GETDATA: Get DNS data for a given hostname

And 2 helper actions:

• GETTYPES: returns a list of possible DNS record types to use for attribute "Type"
• GETCLASSES: returns a list of possible DNS record classes to use for attribute "Class"

Attributes

Examples

<h3>Get IP address or CNAME value for hostname<br />
	&lt;cfdns action="getaddress" host="mail.google.com" /&gt;<br />
	&lt;cfdns action="getaddress" host="googlemail.l.google.com" /&gt;</h3>
<cfdns action="getaddress" host="mail.google.com" />
<cfdump eval=variables.cfdns />
<cfdns action="getaddress" host="googlemail.l.google.com" />
<cfdump eval=variables.cfdns />

<h3>Get hostname for IP address<br />
	&lt;cfdns action="gethostname" ip="60.60.60.60" variable="myCFDNSOutput" /&gt;</h3>
<cfdns action="gethostname" ip="60.60.60.60" variable="myCFDNSOutput" />
<pre style="border:1px solid; padding:5px;"><cfoutput>#myCFDNSOutput#</cfoutput></pre>

<h3>Get certain type of DNS records for a hostname<br />
	&lt;cfdns action="getdata" host="google.com" type="A" /&gt;</h3>
<cfdns action="getdata" host="google.com" type="A" />
<cfdump eval=cfdns />

<h3>Using the [output] and [timeout] attribute<br />
	&lt;cfdns action="getdata" host="microsoft.com" type="A" timeout="30" output="raw" /&gt;</h3>
<cfdns action="getdata" host="microsoft.com" type="A" timeout="30" output="raw" />
<pre style="border:1px solid; padding:5px;"><cfoutput>#cfdns#</cfoutput></pre>

<h3>Get another type of DNS record for a hostname<br />
	&lt;cfdns action="getdata" host="google.com" type="MX" /&gt;</h3>
<cfdns action="getdata" host="google.com" type="MX" />
<cfdump eval=cfdns />

<h3>Using "XML" as the output type<br />
	&lt;cfdns action="getdata" host="www.getrailo.org" type="A" output="xml" /&gt;</h3>
<cfdns action="getdata" host="www.getrailo.org" type="A" output="xml" />
<pre style="border:1px solid; padding:5px;"><cfoutput>#htmleditformat(cfdns)#</cfoutput></pre>

<h3>Get any type of DNS record for a hostname<br />
	&lt;cfdns action="getdata" host="getrailo.org" type="ANY" output="xml" /&gt;</h3>
<cfdns action="getdata" host="getrailo.org" type="ANY" output="xml" />
<pre style="border:1px solid; padding:5px;"><cfoutput>#htmleditformat(cfdns)#</cfoutput></pre>

<h3>Specify a non-default nameserver to do the DNS lookup (and some extra options)<br />
	&lt;cfdns action="lookup" host="www.ongevraagdadvies.nl" server="ns1.ongevraagdadvies.com" port="53" tcp="0" retries="3" timeout="5" /&gt;</h3>
<cfdns action="lookup" host="www.ongevraagdadvies.nl" server="ns1.ongevraagdadvies.com" port="53" tcp="0" retries="3" timeout="5" />
<cfdump eval=cfdns />

Thanks!

A big thank you goes out to Joseph Lamoree, who wrote the original cfdns code. The code is freely available from www.cfdns.org.

Questions? Complaints?

Leave a message; I appreciate it! (most of the time ;)