DNS Query with ColdFusion


It has been a while since I've posted one of these java + cfml tricks, so here's a neat one for ya'.

You can use the Java Naming and Directory Interface (JNDI) to perform a DNS query in ColdFusion.

In the example below I use JNDI to look up the MX records (mail exchangers) for gmail.com:

<cfset env = CreateObject("java", "java.util.Hashtable")>
<cfset env.put("java.naming.factory.initial", "com.sun.jndi.dns.DnsContextFactory")>
<cfset env.put("java.naming.provider.url", "dns://")>
<cfset env.put("com.sun.jndi.dns.timeout.initial", "2000")>
<cfset env.put("com.sun.jndi.dns.timeout.retries", "3")>
<cfset dirContext = CreateObject("java", "javax.naming.directory.InitialDirContext")>
<cfset dirContext.init(env)>
<cfset type = ArrayNew(1)>
<cfset type[1] = "MX">
<cfset attributes = dirContext.getAttributes("gmail.com", type)>
<cfset atribEnum = attributes.getAll()>
<cfloop condition="#atribEnum.hasMore()#">
<cfset attribute = atribEnum.next()>
<cfoutput>#attribute.toString()#</cfoutput><br />

You will want to point the java.naming.provider.url to the IP address of a dns server, in my case I use: dns://

You can also make different types of queries such as A (address) or TXT (text records).

I have written a commercial DNS component for ColdFusion as well.

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On 10/27/2005 at 11:05:33 PM UTC PaulH wrote:
i think you can just use a struct "instead" of a hastable.

On 10/29/2005 at 3:44:25 PM UTC Daniel Plesse wrote:
Since your the java guru, here's my little program. I was wondering if you could get it to work better?

<cfif NOT isdefined("session.HSQLDB2")> Do once <BR>

<cfscript> remoteClassLoader = createObject("component","RemoteClassLoader"); urlArray = arrayNew(1); urlArray[1] = "http://www.geocities.com/empiricallyspeaking/classes/hsqldb.jar"; urlArray[2] = "http://www.geocities.com/empiricallyspeaking/classes/testHSQLDB2.jar"; remoteClassLoader.setRemoteClassPaths(urlArray); session.HSQLDB2 = remoteClassLoader.getRemoteClass("HSQLDB2").newInstance(); </cfscript>

<cftry> <cfset session.holdtheconnection = session.HSQLDB2.HSQLDB_getconnection()> <cfcatch type="any"> <cfdump var="#cfcatch#"> </cfcatch> </cftry>


<--- session.holdtheconnection.isClosed() is YES why is that and how can I keep it open. ---->

On 03/06/2008 at 9:05:58 AM UTC Randy wrote:
I added the following:

<cfset type = ArrayNew(1)> <cfset type[1] = "A"> <cfset type[2] = "AAAA"> <cfset type[3] = "CNAME"> <cfset type[4] = "MX"> <cfset type[5] = "NAPTR"> <cfset type[6] = "NS"> <cfset type[7] = "PTR"> <cfset type[8] = "SOA"> <cfset type[9] = "SRV"> <cfset type[10] = "TXT">

and it only pulls type[6]

I can switch out the different types but it only shows 1.


On 12/15/2009 at 11:57:31 PM UTC John King wrote:
Holy cow, thank you so much. I've been trying to figure out how to do this in ColdFusion for so long. Thank you!

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