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From "William Henry (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (QPID-3375) qpid-route does not resolve hostname and this causes problems with localhost among others
Date Fri, 29 Jul 2011 16:28:10 GMT

    [ https://issues.apache.org/jira/browse/QPID-3375?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13072899#comment-13072899
] 

William Henry commented on QPID-3375:
-------------------------------------

Andrew,

Your points are good ones. 

What I was seeing was the 'localhost' name of the source showing up in the route list on the
remote destination machine.  This clearly is no good.  

Perhaps checking if the the source and dest are localhost then it's ok and allowing the use
of localhost. That would solve all the 'make check' issues.

I was also seeing gaierror if the host is not in the DNS. We were not handling that exception
gracefully. But you are also correct in that the remote machine may be able to resolve better
than the machine where the route is being generated. However that also seems a little bit
messy from an admin perspective.

This is good feedback. And I think what I've sent in would need to be tidied up some more
in light of this.  But I do think allowing erroneous routes to be created is not desirable
and seeing gaierror is also not desirable. (The gaierro was happening on local broker too.)
 


> qpid-route does not resolve hostname and this causes problems with localhost among others
> -----------------------------------------------------------------------------------------
>
>                 Key: QPID-3375
>                 URL: https://issues.apache.org/jira/browse/QPID-3375
>             Project: Qpid
>          Issue Type: Bug
>          Components: python tools
>    Affects Versions: 0.10
>         Environment: All
>            Reporter: William Henry
>            Assignee: Gordon Sim
>              Labels: qpid-route
>         Attachments: qpid-route, qpid-route.diff
>
>
> All the examples for Federation and qpid-route use localhost. For a multihost environment
this is not a good idea.
> 1. 'localhost':<port> can end up in the routing table of remote host erroneously.
> 2. Resolving localhost doesn't help as you'd end up with 127.0.0.1 in the route erroneously
> 3. Even non localhost names don't get resolved and checked.
> Here is the test I was performing. 
> I was doing some playing/testing with federation and I used two machines: my
> laptop (sligo) and a remote machine (buzz).  I ran three brokers: 2 on sligo on
> ports 5672 and 5682 and one on remote on port 5682.
> From sligo I set up some links between all the brokers.
> (The problem has already occurred on the links above. Listing the routes will show the
problem. But we'll go on)
> From sligo I set up a topic exchange on each broker:
> $ qpid-config -a localhost:5672 add exchange topic T.Prod
> $ qpid-config -a localhost:5682 add exchange topic T.Prod
> $ qpid-config -a buzz.somedomain.com:5682 add exchange topic T.Prod
> On sligo I set up dynamic routes from source localhost:5672 to localhost:5682
> and buzz.somedomain.com:5682.
> When I list the routes from sligo I see:
> $ qpid-route route list localhost:5682
> localhost:5682 localhost:5672 T.Prod <dynamic>
> $ qpid-route route list buzz.somedomain.com:5682
> buzz.somedomain.com:5682 localhost:5672 T.Prod <dynamic>
> When I run example program drain on localhost:5682 on sligo I get the messages sent using
the spout example program to default broker on sligo (on 5672).
> When I run drain on buzz I don't see anything.
> I see references to "localhost:5672" in the trace output of buzz's broker.  This is BAD!
> We need qpid-route to resolve hostname before passing the arg to the remote
> broker.
> (In the meantime we might want to warn users of using 'localhost' with
> qpid-route across different hosts.)
> I will attach a diff and a new version of qpid-route for review.

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