DNS Query with ColdFusion

October 27, 2005
coldfusionjava

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://10.0.0.65")>
<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 />
</cfloop>

You will want to point the java.naming.provider.url to the IP address of a dns server, in my case I use: dns://10.0.0.65.

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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Comments

i think you can just use a struct "instead" of a hastable.
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> </cfif> <--- session.holdtheconnection.isClosed() is YES why is that and how can I keep it open. ---->
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. -Randy
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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