[dnsdist] Some questions about applying for GSoC and newBPFFilter

[Y7n05h]

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On Sat, Apr 09, 2022 at 12:51:56PM +0000, Y7n05h via dnsdist wrote:
> Hi!
>
> I spent some time this week preparing for and participating in college
> finals (last semester's finals were postponed this week due to
> COVID-19), so not much time on DNSDist. Fortunately, the exam is over.
>
> I was trying to implement https://github.com/PowerDNS/pdns/issues/9690
> and found that typing bpf = newBPFFilter(1024, 1024, 1024) would give
> me an error here.
>
> [string "bpf = newBPFFilter(1024, 1024, 1024)"]:1: Caught exception:
> Error creating a BPF map of size 1024:
> Operation not permitted stack traceback:
>        [C]: in function 'newBPFFilter'
>        [string "bpf = newBPFFilter(1024, 1024, 1024)"]:1: in main chunk
>
>
> I had the same problem on ArchLinux and Ubuntu 21.10.
> They all use the default kernel and run DNSDist as root.
> I wonder why this is.
>
>
> My GSoC proposal has not been submitted due to previous exams.
> I have now submitted a draft, if possible, please suggest some
> revisions.
>
> A copy of the proposal can be accessed from the link below.
> Comments are welcome.
>
> https://docs.google.com/document/d/1_izkQDoEhrv4Ooa4ja4WVUDyLvsNSKE_GgnRUUJPk-g

It really bothers everyone. Thanks Sukhbir Singh for the reply. Also
thanks to ottom for helping me a lot at IRC. This problem was solved
with the help of ottom.

The reason for the error is that I failed to notice the need to use
"addCapabilitiesToRetain(capabilities)" to add capabilities, even
though I run dnsdist with sudo.

--
Best regards,

Y7n05h

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