[Nfd-dev] Incorrect handling of exclude filter in CS lookup

[Junxiao Shi]

Hi Wentao

This behavior is by design.

The Interest has this Exclude Selector:
<Exclude>
  <NameComponent></NameComponent>
  <NameComponent>%FD%00%00%01L5%F1K%21</NameComponent>
</Exclude>
Note that there isn't a <Any/> element between two NameComponents.

The returned Data does not violate this Exclude Selector, because
%FD%00%00%01L5%F1%3D%BF doesn't appear in this Exclude Selector.

Yours, Junxiao

On Fri, Mar 20, 2015 at 12:02 AM, Wentao Shang <wentaoshang at gmail.com>
wrote:

> Hi Junxiao,
>
> I found this problem on iOS using an "incorrect" implementation of the
> FaceStatus Dataset consumer. I'm not sure how to reproduce this error on
> normal computers yet. But here is a dump of log messages from NFD (this is
> the best I can get to describe the problem...):
>
>
> 2015-03-19 23:49:20.532 NFD[5139:69230] TRACE: [TcpLocalFace]
> [id=257,local=tcp4://127.0.0.1:6363,remote=tcp4://127.0.0.1:51868]
> Received: 63 bytes
>
> 2015-03-19 23:49:20.532 NFD[5139:69230] DEBUG: [Forwarder]
> onIncomingInterest face=257
> interest=/localhost/nfd/faces/list?ndn.ChildSelector=1&ndn.InterestLifetime=1000&ndn.Nonce=1313767654&ndn.Exclude=...,%FD%00%00%01L5%F1K%21
>
>
> 2015-03-19 23:49:20.533 NFD[5139:69230] DEBUG: [ContentStore] find
> /localhost/nfd/faces/list R
>
> 2015-03-19 23:49:20.533 NFD[5139:69230] TRACE: [ContentStore]
> find-under-prefix /localhost/nfd/faces/list/%FD%00%00%01L5%F1K%21
>
> 2015-03-19 23:49:20.533 NFD[5139:69230] TRACE: [ContentStore]
> find-under-prefix /localhost/nfd/faces/list/%FD%00%00%01L5%F1%3D%BF
>
> 2015-03-19 23:49:20.533 NFD[5139:69230] DEBUG: [ContentStore] matching
> /localhost/nfd/faces/list/%FD%00%00%01L5%F1%3D%BF/%00%00
>
> 2015-03-19 23:49:20.533 NFD[5139:69230] DEBUG: [Forwarder] onOutgoingData
> face=257 data=/localhost/nfd/faces/list/%FD%00%00%01L5%F1%3D%BF/%00%00
>
> 2015-03-19 23:49:20.534 NFD[5139:69230] TRACE: [TcpLocalFace]
> [id=257,local=tcp4://127.0.0.1:6363,remote=tcp4://127.0.0.1:51868]
> sendData
>
> 2015-03-19 23:49:20.534 NFD[5139:69230] TRACE: [TcpLocalFace]
> [id=257,local=tcp4://127.0.0.1:6363,remote=tcp4://127.0.0.1:51868]
> Successfully sent: 724 bytes
>
> 2015-03-19 23:49:20.637 NFD[5139:69230] DEBUG: [Forwarder]
> onInterestFinalize interest=/localhost/nfd/faces/list satisfied
>
> You can see that I sent an Interest with exclude filter of [ANY,
> %FD%00%00%01L5%F1K%21]. But somehow NFD decided to match this interest to
> the data with suffix "%FD%00%00%01L5%F1%3D%BF/%00%00". Note that
> "%FD%00%00%01L5%F1K%21" is larger than "%FD%00%00%01L5%F1%3D%BF" because
> 'K' == 0x4B. So this data should have been filtered out...
>
> Thanks,
> Wentao
>
>
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