netdev - Re: Passive OS fingerprint xtables match (iptables part)

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Date:	Fri, 13 Feb 2009 14:54:25 +0100 (CET)
From:	Jan Engelhardt <jengelh@...ozas.de>
To:	Evgeniy Polyakov <zbr@...emap.net>
cc:	Patrick McHardy <kaber@...sh.net>, netdev@...r.kernel.org,
	David Miller <davem@...emloft.net>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Netfilter Development Mailinglist 
	<netfilter-devel@...r.kernel.org>
Subject: Re: Passive OS fingerprint xtables match (iptables part)


On Friday 2009-02-13 14:12, Evgeniy Polyakov wrote:
>On Fri, Feb 13, 2009 at 02:03:10PM +0100, Jan Engelhardt (jengelh@...ozas.de) wrote:
>> >> >	printf("OS fingerprint match options:\n"
>> >> >		"--genre [!] string	Match a OS genre by passive fingerprinting.\n"
>> >> 
>> >> The syntax should be  [!] --genre string, that is what most
>> >> others use. Then the check_inverse call also be removed.
>> >
>> >Actually not, it has genre not Linux (Windows, Solaris, HPUX and so on).
>> 
>> It may not coincide with English grammar, but it is easier to parse.
>
>'! --genre Linux' means this option was not specified,
>'--genre ! Linux' means everything but Linux.

Well not in iptables. Not specifying an option is represented by 
voidness/absence of any string. (E.g. iptables -d 192.168.0.0/16  vs.
iptables ! -s 172.16.0.0/12 -d 192.168.0.0/16)
Also, (!(--genre == "linux")) is eqv. (--genre != "linux")
is equivalent in boolean logic  ;-)
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