File type rulesets

[Julian Field]

On 29 Jun 2005, at 14:33, Brad Beckenhauer wrote:

> Very cool!
>
> as Martin said:
> "just spent a few mins getting my head around this..."
>
> Can we use "variable substitution" as shown below?  My thought was  
> that this would shorten "the line".

Yes, very good point. Using a %default-fn-rules% setting would  
shorten and simplify the example quite a bit.

> Example:
>
> filename.rules
> # set the variable to point to the default filename.rules.conf file
> %def-file-rules% = %etc-dir%/filename.rules.conf
>
> # Direction         Pattern            Ruleset to use
> # -------------------------------------------------
> FromOrTo:  *@domainA.com    %rules-dir%/ 
> filename.domainA.rules.conf    %def-file-rules%
> #
> FromOrTo:  john at doe.com       %rules-dir%/ 
> filename.doe.com.rules.conf    %def-file-rules%
> #
> FromOrTo:     default                 %etc-dir%/filename.rules.conf
>
>
> Brad
>
>
>
>>>> Julian Field<MailScanner at ECS.SOTON.AC.UK> 6/29/2005 7:41:11 AM >>>
>>>>
> On 29 Jun 2005, at 12:30, Martin Hepworth wrote:
>
>
>> Julian
>>
>> just spend a few mins getting my head around this...
>>
>> OK this is quite nicely put, can this go in the wiki maybe with a
>> full example rather than the partial you provided.
>>
>
> How about you add it and mail me the URL and I will check it for you.
> That you you can see if you really understand it, by you adding the
> extra bits yourself. I will then just correct anthing that's wrong.
>
>
>> I presume the followind would be correct...
>>
>> %rules-dir%/filename.rules:
>> FromOrTo: *@domain1.ie /etc/MailScanner/filename.domain1.ie.conf /
>> etc/MailScanner/filename.rules.conf
>> FromOrTo: default /etc/MailScanner/filename.rules.conf
>>
>
> Correct.
>
>
>> Julian Field wrote:
>>
>>
>>> No replies to this yet, did I scare everyone off? :-)
>>> On 29 Jun 2005, at 10:41, Julian Field wrote:
>>>
>>>
>>>> Where you say
>>>> Filename Rules = %etc-dir%/filename.rules
>>>> I think you mean
>>>> Filename Rules = %rules-dir%/filename.rules
>>>> and immediately below it I would say "/etc/MailScanner/rules"
>>>>
>>>> START READING HERE
>>>>
>>>> There is actually a way you can make this whole setup neater and
>>>> easier to maintain.
>>>>
>>>> Whenever (in the MailScanner.conf or a *.rules file) you specify
>>>> the name of a "filename.rules.conf" file, you can supply a space-
>>>> separated list of filename.rules.conf files.
>>>>
>>>> The filename allow/deny rules that are applied are the
>>>> concatenation of all the filename.rules.conf files that you have
>>>> listed.
>>>>
>>>> The allow/deny rule that is used for a particular attachment is
>>>> the  first one that matches. It stops processing there and does
>>>> the  allow or deny (or deny+delete) that is appropriate.
>>>>
>>>> So you DON'T need to have a filename.rules.conf file that is a
>>>> copy  of the supplied one with an extra rule at the top (deny
>>>> \.zip$ -  -). If you have a lot of these files this can get very
>>>> awkward and  hard to maintain.
>>>>
>>>> All you actually need is one copy of the supplied
>>>> filename.rules.conf file, and 1 file for each modification. In
>>>> this  example we are going to block zip files for mail to/from
>>>> 'domain1.ie'.
>>>>
>>>> MailScanner.conf:
>>>> Filename Rules = %rules-dir%/filename.rules
>>>>
>>>> %rules-dir%/filename.rules:
>>>> FromOrTo: *@domain1.ie /etc/MailScanner/
>>>> filename.domain1.ie.conf / etc/MailScanner/filename.rules.conf
>>>>
>>>> *** Here is the difference ***
>>>> /etc/MailScanner/filename.domain1.ie.conf:
>>>> deny \.zip$ - -
>>>>
>>>> /etc/MailScanner/filename.rules.conf:
>>>> Exactly as I supply it
>>>>
>>>> The thing to notice is the the filename.domain1.ie.conf only
>>>> needs  to contain 1 line, it does not need to repeat the whole
>>>> of  filename.rules.conf.
>>>>
>>>> Cool huh?
>>>>
>>>> On 29 Jun 2005, at 01:23, Michele Neylon:: Blacknight.ie wrote:
>>>>
>>>>
>>>>
>>>>
>>>>> Following on my own issues with rulesets I posted the following:
>>>>>
>>>>> http://www.mneylon.com/blog/archives/2005/06/29/content-
>>>>> filtering- with-mails
>>>>> canner-part-1-file-types/
>>>>>
>>>>> Any input, corrections etc., are welcome
>>>>>
>>>>> Michele

-- 
Julian Field
www.MailScanner.info
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