[PATCH] Add support for multiplexed connections in dcerpc server
Stefan (metze) Metzmacher
metze at samba.org
Tue Mar 24 09:42:00 MDT 2015
Thanks, that looks good!
Can we get a 2nd reviewer?
> Good afternoon all,
> Attached is a patch to add support for multiplexed connections in dcerpc
> server. The implementation scope is similar to
> DCESRV_CALL_STATE_FLAG_ASYNC, which means that the endpoint defines
> whether it supports the flag or not by adding it to dcesrv_call_state
> Context: Microsoft Exchange is implementing a DCERPC endpoint server
> called async_emsmdb with a single asynchronous call named
> EcDoAyncWaitEx. When Outlook sends a EcDoAsyncWaitEx request, the server
> does not reply unless there is either a notification for Outlook to
> process or the timeout of 5 minutes is reached. Without this patch,
> Microsoft Outlook clients block and do not move further with any of the
> existing connections from DCERPC altered context unless the call to
> EcDoAsyncWaitEx actually returns. With this patch, Outlook operates
> properly and as expected.
> I have identified that implementing this multiplexed connection behavior
> was both required when:
> 1. initializing a new connection, hence dcesrv_bind
> 2. when altering an existing context, hence dcesrv_alter. However,
> in this specific case we don't have existing state_flags on the
> connection. It is therefore necessary to save and retrieving the
> flags from the existing context to decide whether or not the
> DCERPC_PFC_FLAG_CONC_MPX should be applied to the state_flags of the
> current connection.
> If you are happy with this patch, I would really appreciate if it could
> also be applied to 4.1.X series.
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