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  Message 1 of 2  
07 Dec 17 12:46
Peter Scott
Join Date: 17 Feb 2012
Posts To This List: 681
Re[2]: Re[2]: Re[2]: How to filter the request in MUP?

You should read up on how MUP actually works. MUP is the=20 multi-UNC-Provider so it is the multiplexor for the registered UNC=20 providers such as the LanMan redirector. When a pre-create request is=20 first handled for a network share, it is passed to MUP which sends=20 IOCtls down to the various registered UNC providers to determine which=20 provider will handle the specific request, it will cache this=20 information for a period of time so it won't go through these steps for=20 future requests to the same target ... a little hand waving here. Once=20 the UNC provider is determined, MUP will no longer be called for the=20 remaining requests for the FO but are sent directly to the underlying=20 provider, such as LanMan (see the VPB in the FO). That said, you actually want to be attaching to the LanMan device, or=20 whichever redirector you want to filter. In your InstanceSetup callback=20 you will be called for MUP as well as any UNC provider that is loaded so=20 here you can select to attach to LanMan, etc. You can see this in tools=20 such as FileSpy, you have the option to attach to MUP or LanMan ... Pete -- Kernel Drivers Windows File System and Device Driver Consulting 866.263.9295 ------ Original Message ------ From: "" <> To: "Windows File Systems Devs Interest List" <> Sent: 12/7/2017 10:30:00 AM Subject: RE:[ntfsd] Re[2]: Re[2]: How to filter the request in MUP? >I just don't understand why my filter can not catch the following=20 >request? > >--- >NTFSD is sponsored by OSR > > >MONTHLY seminars on crash dump analysis, WDF, Windows internals and=20 >software drivers! >Details at <> <...excess quoted lines suppressed...>
  Message 2 of 2  
07 Dec 17 13:04
Hunter Wang
Join Date: 20 Mar 2017
Posts To This List: 9
Re[2]: Re[2]: Re[2]: How to filter the request in MUP?

Thanks so much for your explanation, let me try to understand this: The MUP is just a multiplexor for the registered UNC providers(LanMan redirector in my condition), the mup will only catch the first pre-create request, it determines which provider should handle the following request according to this. So my encryption filter should let the first pre-create request go without doing any changes, and the following requests(down to LanMan redirector in my condition) should be handled as normal, such as create a file object in the pre-create and substitute for the fake one in all of the following requests. Am I right? ;-D
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