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Date: Mon, 23 Aug 2004 09:51:54 -0600
From: Greg Lewis <glewis@eyesbeyond.com>
To: Brad Karp <bkarp+@cs.cmu.edu>
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cc: freebsd-java@freebsd.org
Subject: Re: getHostName() broken?
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On Thu, Aug 19, 2004 at 11:01:30PM -0400, Brad Karp wrote:
> I'm running 4.9-RELEASE, and have built the jdk1.4.2 port using revision 5
> of the FreeBSD patch kit.
>
> I have a visualization application written in Java by a colleague that I've
> been running. The application shows nodes in a large-scale distributed system,
> and allows clicking on a host to show its Internet hostname.
>
> The code uses getHostName() to do this.
>
> I find that these reverse DNS lookups *all* fail; getHostName() returns a
> String that is a textual representation of the IP address. (There's no
> security manager involved here, BTW. The reference for getHostName() says
> the security manager may check for authorization on getHostName() calls,
> but I've not changed my Java runtime's security policy from the defaults.)
>
> Further poking reveals that *no* outbound DNS queries (traffic destined for
> UDP or TCP port 53) are being generated for these reverse name lookups!
>
> I'm perplexed. Can it really be that InetAddress.getHostName() is broken on
> FreeBSD? Has anyone seen similar behavior, and if so, can you propose a
> workaround, apart from linking in C code to do these reverse name lookups?
Works for me. Test code attached. Here is the output:
> java -cp . HostName
66.35.250.151
star.slashdot.org
Are you sure resolution works for you normally? Can you run host(1) and
check that lookups succeed for the hosts?
--
Greg Lewis Email : glewis@eyesbeyond.com
Eyes Beyond Web : http://www.eyesbeyond.com
Information Technology FreeBSD : glewis@FreeBSD.org
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Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment; filename="HostName.java"
import java.net.*;
class
HostName {
public
static
void
main(String[] args) {
try {
InetAddress addr = InetAddress.getByName("66.35.250.151");
System.out.println(addr.getHostAddress());
System.out.println(addr.getHostName());
}
catch (Throwable t) {
t.printStackTrace();
}
}
}
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