Andrew Stitcher created QPID-4931:
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Summary: Broker should only listen to a single network address if
"--port 0" is specified
Key: QPID-4931
URL: https://issues.apache.org/jira/browse/QPID-4931
Project: Qpid
Issue Type: Improvement
Components: C++ Broker
Reporter: Andrew Stitcher
Assignee: Andrew Stitcher
The C++ broker has a setting which is really only useful for testing which
allows the broker to listen to whichever port the kernel gives it. In this mode
it prints the received port on stdout for subsequent testing programs to use.
When you listen to multiple network addresses (addresses are multiple network
interfaces or multiple protocols on the same network interface - IPv4 & IPv6
for example) the broker has to remember the port it got for the first address
and then try to get the same port for subsequent addresses.
Unfortunately there is no guarantee that the same port will actually be
available on the other addresses so the entire broker startup can fail.
In the testing environment which this is useful for you only care about the
IPv4 loopback address in any case so we have to ensure that this address is the
only (or at least the first) address used.
Because we can't guarantee getting the same port for more than one address it
makes sense to restrict "--port 0" to only listening to a single address.
I propose that if the broker detects that more than one address has been
specified or is implied by the network setup it should list to the first
address and log a warning message with the actual address listened to.
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