[jboss-jira] [JBoss JIRA] Created: (JGRP-739) check all bind_address against NetworkInterface.getByInetAddress() to see if it exists on the machine

Wed Apr 23 09:21:59 EDT 2008

check all bind_address against NetworkInterface.getByInetAddress() to see if it exists on the machine
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                 Key: JGRP-739
                 URL: http://jira.jboss.com/jira/browse/JGRP-739
             Project: JGroups
          Issue Type: Feature Request
            Reporter: Michael Newcomb
         Assigned To: Bela Ban
            Priority: Minor

Could you add a check in Util.getBindAddress() that checks the bind_addr against NetworkInterface.getByInetAddress() and throws some sort of exception if no NetworkInterface is returned?

I set my bind_addr via a database parameter and if the user mistakenly assigns the wrong bind address, it doesn't show up until UDP.createEphemeralDatagramSocket() when the localPort goes over 65535 because each attempt to create a DatagramSocket with the inet address that is not a local address throws a SocketException (actually a BindException) which is caught but ignored. When localPort finally goes over 65535 it throws an IllegalArgumentException.

So, a check in Util.getBindAddress() to see if the bind_addr is even available on the machine would lead to a failure in the configuration stage (setProperties).

As a side question, doesn't creating a DatagramSocket with port=0 guarantee an ephemeral port? Is it necessary to 'scan' for one? Perhaps a failure from the initial attempt with port=0 would wait a few ms and then try again with port=0?

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