[cifs-protocol] [REG:111051857287367] BranchCache and SMB2: Questions specific to BranchCache.

[Christopher R. Hertel]

Edgar,

Before I send the captures, here is an analysis I did.  I simply copied
the raw hex values from Wireshark, so the numeric values are displayed
in wire order.

Note that there are only two differences between the MS IIS output and
the "CRH Test" output.   The different values are marked with an
asterisk ('*'), but you can ignore the differences between the
*SegmentHashOfData* values since that difference is expected.

The key field, then, is *dwReadBytesInLastSegment*.  Note that in my
output, the value of *dwReadBytesInLastSegment* matches the value of
*cbSegment*.  This matches the description in the [MS-PCCRC] document
and also the example given in that document.  IIS, however, returns zero
in that field.

Chris -)-----


MS IIS:

                 Version(2): 0001

              dwHashAlgo(4): 0c800000

  dwOffsetInFirstSegment(4): 00000000

dwReadBytesInLastSegment(4): 00000000 *

               cSegments(4): 01000000

   S0:ullOffsetInContent(8): 0000000000000000

            S0:cbSegment(4): 9bce0b00

          S0:cbBlockSize(4): 00000100

   S0:SegmentHashOfData(32): efab36dee4c3d86b2c3ee1170ad5b99eebddb73399c5cc80070bfa9a8a5bf230

       S0:SegmentSecret(32): 67bca7ad0092d0467ab74728983ce08540198c38f4cdba9e8a245d9c82c779d8 *

              B0:cBlocks(4): 0c000000

        B0:BlockHash[0](32): d4aea98c53a8df7eec3496bae930dbdb152358b0917dda8be811c2ed55613ed5

        B0:BlockHash[1](32): 148b440e24010bf86e3cc6f9e517ef2198af8df1e8c1f299f3dc7c4e27328829

        B0:BlockHash[2](32): 0c09c0e8d3924fd9903272e571dd6c50a2d5d931c7bc86ba354189e69ec0535f

        B0:BlockHash[3](32): 32dbd42bc185f214af428858a33cc77efe97e8050abbd83b4243e360e32995dc

        B0:BlockHash[4](32): bd22b097902b9174cf3decaef9f6208618bd18636c3b4283174a1054396bde20

        B0:BlockHash[5](32): 08911bbb59f43dc69f4b3019ce5dbb43ff1e8d48ae48e1cac375c7f0464bd696

        B0:BlockHash[6](32): 3c8c5d2fd0c9ea5576e0bc274308b2e47491922f97411abaa1345eaae58b8496

        B0:BlockHash[7](32): dda2e978a0a060e59d935af347e0811f20a74aeeb8720d847a8227a8b4c604e6

        B0:BlockHash[8](32): 32ddf8fa5fc939578b0b855427d49ff39592dcd6006b711216990b5b9281bd92

        B0:BlockHash[9](32): 32ad5e61ae07971833b7f197b5fa7cf897f1e4d6f6a76969037ef0c6e8d0eea4

        B0:BlockHash[A](32): 6df71b63601c9bffa26defcd8775c8d9e171f28a6e228349afbbc43cede32a8b

        B0:BlockHash[B](32): 32311bd60095b7510dba2a5d970dbe594829879e5d889428822d3ada005e6225


CRH Test:

                 Version(2): 0001

              dwHashAlgo(4): 0c800000

  dwOffsetInFirstSegment(4): 00000000

dwReadBytesInLastSegment(4): 9bce0b00 *

               cSegments(4): 01000000

   S0:ullOffsetInContent(8): 0000000000000000

            S0:cbSegment(4): 9bce0b00

          S0:cbBlockSize(4): 00000100

   S0:SegmentHashOfData(32): efab36dee4c3d86b2c3ee1170ad5b99eebddb73399c5cc80070bfa9a8a5bf230

       S0:SegmentSecret(32): 3031323334353637383961626364656630313233343536373839414243444546 *

              B0:cBlocks(4): 0c000000

        B0:BlockHash[0](32): d4aea98c53a8df7eec3496bae930dbdb152358b0917dda8be811c2ed55613ed5

        B0:BlockHash[1](32): 148b440e24010bf86e3cc6f9e517ef2198af8df1e8c1f299f3dc7c4e27328829

        B0:BlockHash[2](32): 0c09c0e8d3924fd9903272e571dd6c50a2d5d931c7bc86ba354189e69ec0535f

        B0:BlockHash[3](32): 32dbd42bc185f214af428858a33cc77efe97e8050abbd83b4243e360e32995dc

        B0:BlockHash[4](32): bd22b097902b9174cf3decaef9f6208618bd18636c3b4283174a1054396bde20

        B0:BlockHash[5](32): 08911bbb59f43dc69f4b3019ce5dbb43ff1e8d48ae48e1cac375c7f0464bd696

        B0:BlockHash[6](32): 3c8c5d2fd0c9ea5576e0bc274308b2e47491922f97411abaa1345eaae58b8496

        B0:BlockHash[7](32): dda2e978a0a060e59d935af347e0811f20a74aeeb8720d847a8227a8b4c604e6

        B0:BlockHash[8](32): 32ddf8fa5fc939578b0b855427d49ff39592dcd6006b711216990b5b9281bd92

        B0:BlockHash[9](32): 32ad5e61ae07971833b7f197b5fa7cf897f1e4d6f6a76969037ef0c6e8d0eea4

        B0:BlockHash[A](32): 6df71b63601c9bffa26defcd8775c8d9e171f28a6e228349afbbc43cede32a8b

        B0:BlockHash[B](32): 32311bd60095b7510dba2a5d970dbe594829879e5d889428822d3ada005e6225


-- 
"Implementing CIFS - the Common Internet FileSystem" ISBN: 013047116X
Samba Team -- http://www.samba.org/     -)-----   Christopher R. Hertel
jCIFS Team -- http://jcifs.samba.org/   -)-----   ubiqx development, uninq.
ubiqx Team -- http://www.ubiqx.org/     -)-----   crh at ubiqx.mn.org
OnLineBook -- http://ubiqx.org/cifs/    -)-----   crh at ubiqx.org