From: Patrick McHardy <kaber@trash.net>
To: Jan Engelhardt <jengelh@medozas.de>
Cc: netfilter-devel@vger.kernel.org
Subject: Re: [PATCH 10/13] libxt_rateest: avoid optional arguments
Date: Tue, 24 May 2011 14:49:28 +0200 [thread overview]
Message-ID: <4DDBA958.30004@trash.net> (raw)
In-Reply-To: <alpine.LNX.2.01.1105241040260.13058@frira.zrqbmnf.qr>
On 24.05.2011 10:51, Jan Engelhardt wrote:
>
> On Tuesday 2011-05-24 10:14, Patrick McHardy wrote:
>>>> On 23.05.2011 16:39, Jan Engelhardt wrote:
>>>>> Optional arguments make parsing unnecessarily harder - even more so
>>>>> than two-args. Right now, rateest even crashes because of it.
>>>>>
>>>>> static const struct option rateest_opts[] = {
>>> [...]
>>>>> - {.name = "rateest-bps1", .has_arg = false, .val = OPT_RATEEST_BPS1},
>>>>> + {.name = "rateest-bps1", .has_arg = true, .val = OPT_RATEEST_BPS1},
>>> [...]
>>>>
>>>> This appears to be breaking backwards compatibility.
>>>
>>> Admittedly yes, though the fact that this has remained unseen for so
>>> long suggests that the potential user base is very small or not yet
>>> existing.
>>
>> I'm pretty sure this used to work at some point. Let me check history.
>>
>>> In my time with users in IRC, I notice that they in particular prefer
>>> hard stops in parsing over silent upgrades of rules[1], so as to
>>> actually become aware of the change upfront. As such, I believe the
>>> impact is well justified.
>>
>> Well, if it really was broken from the beginning I'm fine of course,
>> but I don't think that's case.
>
> It works half of the time, and fails half of the time because it can
> run - since the beginning - into UB when using argv[optind].
>
> Yes, the fix can be done in many ways, silent update is possible, but
> that is undesirable, as are optional arguments in the first place.
>
Well, not breaking compatibility for the people it used to work for
certainly is desirable. If its not too much trouble, I very much
prefer a soft update and if necessary replacement of the old options
after some warning period.
next prev parent reply other threads:[~2011-05-24 12:50 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-23 14:39 option parsing, run 9 Jan Engelhardt
2011-05-23 14:39 ` [PATCH 01/13] libxtables: retract _NE types and use a flag instead Jan Engelhardt
2011-05-23 14:39 ` [PATCH 02/13] libipt_REDIRECT: "--to-ports" is not mandatory Jan Engelhardt
2011-05-23 14:39 ` [PATCH 03/13] libxt_quota: readd missing XTOPT_PUT request Jan Engelhardt
2011-05-23 14:39 ` [PATCH 04/13] libxt_quota: make sure uint64 is not truncated Jan Engelhardt
2011-05-23 14:39 ` [PATCH 05/13] libxtables: check for negative numbers in xtables_strtou* Jan Engelhardt
2011-05-23 14:39 ` [PATCH 06/13] libxt_rateest: streamline case display of units Jan Engelhardt
2011-05-23 14:39 ` [PATCH 07/13] doc: add some coded option examples to libxt_hashlimit Jan Engelhardt
2011-05-23 14:39 ` [PATCH 08/13] doc: make usage of libxt_rateest more obvious Jan Engelhardt
2011-05-23 14:39 ` [PATCH 09/13] doc: clarify that -p all is a special keyword only Jan Engelhardt
2011-05-23 14:39 ` [PATCH 10/13] libxt_rateest: avoid optional arguments Jan Engelhardt
2011-05-24 6:46 ` Patrick McHardy
2011-05-24 8:03 ` Jan Engelhardt
2011-05-24 8:14 ` Patrick McHardy
2011-05-24 8:51 ` Jan Engelhardt
2011-05-24 12:49 ` Patrick McHardy [this message]
2011-05-23 14:39 ` [PATCH 11/13] libxt_rateest: fix rateest save operation Jan Engelhardt
2011-05-23 14:39 ` [PATCH 12/13] libxt_rateest: use guided option parser Jan Engelhardt
2011-05-23 14:39 ` [PATCH 13/13] libxt_ipvs: restore network-byte order Jan Engelhardt
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