[jira] Closed: (DIRMINA-386) SocketSessionConfigImpl: initialize() uses "localhost" to bind InetSocketAddress, should use IP instead

["Kenji Hollis (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/DIRMINA-386?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Kenji Hollis closed DIRMINA-386.
--------------------------------


Fixed the issue.  The new block of code locked down the lookups and failure fallbacks properly.  The code I tested against that was failing previously now works without a hitch.  Thanks for the quick response!

> SocketSessionConfigImpl: initialize() uses "localhost" to bind InetSocketAddress, should use IP instead
> -------------------------------------------------------------------------------------------------------
>
>                 Key: DIRMINA-386
>                 URL: https://issues.apache.org/jira/browse/DIRMINA-386
>             Project: MINA
>          Issue Type: Bug
>          Components: Transport
>    Affects Versions: 1.0.3, 1.1.0
>         Environment: JDK 5/6, Linux, Windows, Solaris
>            Reporter: Kenji Hollis
>            Assignee: Trustin Lee
>             Fix For: 1.0.4, 1.1.1
>
>
> The main issue here is if a programmer has decided to override the DNS entries, or run the MINA software in a firewalled environment (where DNS is firewalled, for instance), MINA will throw an "Unresolved Host" IO Exception at line 66 of SocketSessionConfigImpl.java.  This can flat-out be re-created every time by simply overriding the DNS entry on the local machine to 127.0.0.1 (resolv.conf).
> Because the "initialize()" function simply binds to localhost to retrieve socket configuration defaults, there is a better way to approach this.  This method has been tested, and is known to work.
> Instead of binding to localhost, bind to "127.0.0.1" or "0.0.0.0" as the address.  Binding to 127.0.0.1 will do the exact same thing, effectively, as looking up localhost.  Ultimately, this will be a FASTER initialization, as it needs to resolve "localhost" to an IP.  By giving the system an IP address to begin with, we resolve this issue.
> What I did was created a local private static final String called "LOCALHOST_ADDRESS" in the top area of the class, and set it to 127.0.0.1.  I then modified line 66 to use LOCALHOST_ADDRESS, as well as line 73 to use LOCALHOST_ADDRESS on the socket.connect.
> At the company I work for, we were able to recreate the issue of the code NOT working, and the code WORKING.  By modifying the code to use localhost as 127.0.0.1 or 0.0.0.0, we got around the DNS lookup failure, and MINA fired right up happily.
> I recommend this fix be added in the next release - both major and minor - for MINA.  The company I work for is doing performance testing with MINA now, and we may be using it to replace the main socket functionality if all goes well.  I would like to see this fix in the next milestone release if at all possible.
> If you need a patch file provided, I would be more than happy to give one!

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