Re: [PATCH] iptables: add -C to check for existing rules

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On Tuesday 2011-03-08 22:42, Stefan Tomanek wrote:

>It is often useful to check whether a specific rule is already present
>in a chain without actually modifying the iptables config.
>
>Services like fail2ban usually employ techniques like grepping through
>the output of "iptables -L" which is quite error prone.
>
>This patch adds a new operation -C to the iptables command which mostly
>works like -D; it can detect and indicate the existence of the specified
>rule by modifying the exit code. The new operation TC_CHECK_ENTRY uses
>the same code as the -D operation, whose functions got a dry-run
>parameter appended.

I picked this up, sorted -C in and ironed out a few style issues.
Thanks.
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