[RFC] inconsistent between '<listen>' and '--address' of message bus

Yang Chengwei chengwei.yang at intel.com
Mon Jul 15 02:20:16 PDT 2013

Bug filed to track this topic.


On Mon, Jul 15, 2013 at 03:29:42PM +0800, Yang Chengwei wrote:
> Hi List,
> I just found that there is an inconsistent issue of message bus server
> address.
> There are two ways to specify the message bus server addresses, from
> command line option "--address" or configure "<listen>" element in bus
> config file.
> However, they behave a little different as below.
> Quote from DBus Spec
>  [FIXME clarify if attempting to connect to each is a requirement or
>  just a suggestion] When connecting to a server, multiple server
>  addresses can be separated by a semi-colon. The library will then try
>  to connect to the first address and if that fails, it'll try to connect
>  to the next one specified, and so forth. For example
>  unix:path=/tmp/dbus-test;unix:path=/tmp/dbus-test2
> Quote from dbus-daemon(1)
>  ·   <listen>
>      Add an address that the bus should listen on. The address
> 	 is in the standard D-Bus format that contains a transport
> 	 name plus possible parameters/options.
> 	 Example: <listen>unix:path=/tmp/foo</listen>
> 	 Example: <listen>tcp:host=localhost,port=1234</listen>
> 	 If there are multiple <listen> elements, then the bus listens
> 	 on multiple addresses. The bus will pass its address to
> 	 started services or other interested parties with
> 	 the last address given in <listen> first. That
> 	 is, apps will try to connect to the last <listen>
> 	 address first.
> So seems that we're saying: there is no way to listen on multiple
> address if you're using '--address' option, if that is your case,
> configure '<listen>' in config file instead.
> Should this to be fixed?
> If so, how? Align '<listen>(man page)' with '--address(dbus spec)' or
> the reverse?
> --
> Thanks,
> Chengwei

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> dbus at lists.freedesktop.org
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