netdev - Re: [iproute PATCH] lib/bpf: Fix bytecode-file parsing

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Date:   Fri, 01 Sep 2017 21:13:32 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Phil Sutter <phil@....cc>,
        Stephen Hemminger <stephen@...workplumber.org>,
        netdev@...r.kernel.org
Subject: Re: [iproute PATCH] lib/bpf: Fix bytecode-file parsing

On 08/30/2017 04:11 PM, Phil Sutter wrote:
> On Wed, Aug 30, 2017 at 03:53:59PM +0200, Daniel Borkmann wrote:
>> On 08/29/2017 05:09 PM, Phil Sutter wrote:
[...]
>>
>> I don't really have a strong opinion on this, but the logic for
>> normalizing here is getting a bit convoluted. Is your use case
>> for making the parser more robust mainly so you can just use the
>> -ddd output from tcpdump for cBPF w/o piping through tr? But even
>> that shouldn't give multiple empty lines afaik, no?
>
> Well, using tcpdump output was functional before already. I just noticed
> that if I add an empty line to the end of bytecode-file, it will fail
> and I didn't like that. Then while searching for the EOF issue, I
> noticed that the parser logic above is a bit faulty in that it will
> treat different characters equally but doesn't make sure c_prev will be
> assigned only one of them. So apart from the added robustness, it really
> fixes an inconsistency in the parsing logic.

Ok, fine by me.