Re: [squid-users] limiting connections

On Sat, Mar 24, 2012 at 6:31 PM, Amos Jeffries <squid3_at_treenet.co.nz> wrote:
> On 25/03/2012 7:23 a.m., Carlos Manuel Trepeu Pupo wrote:
>
>> On Thu, Mar 22, 2012 at 10:00 PM, Amos Jeffries wrote:
>>>
>>> On 23/03/2012 5:42 a.m., Carlos Manuel Trepeu Pupo wrote:
>>>>
>>>> I need to block each user to make just one connection to download
>>>> specific extension files, but I dont know how to tell that can make
>>>> just one connection to each file and not just one connection to every
>>>> file with this extension.
>>>>
>>>> i.e:
>>>> www.google.com #All connection that required
>>>> www.any.domain.com/my_file.rar #just one connection to that file
>>>> www.other.domain.net/other_file.iso #just connection to this file
>>>> www.other_domain1.com/other_file1.rar #just one connection to that file
>>>>
>>>> I hope you understand me and can help me, I have my boss hurrying me !!!
>>>
>>>
>>> There is no easy way to test this in Squid.
>>>
>>> You need an external_acl_type helper which gets given the URI and decides
>>> whether it is permitted or not. That decision can be made by querying
>>> Squid
>>> cache manager for the list of active_requests and seeing if the URL
>>> appears
>>> more than once.
>>
>> Hello Amos, following your instructions I make this external_acl_type
>> helper:
>>
>> #!/bin/bash
>> result=`squidclient -h 192.168.19.19 mgr:active_requests | grep -c "$1"`
>> if [ $result -eq 0 ]
>> then
>> echo 'OK'
>> else
>> echo 'ERR'
>> fi
>>
>> # If I have the same URI then I denied. I make a few test and it work
>> for me. The problem is when I add the rule to the squid. I make this:
>>
>> acl extensions url_regex "/etc/squid3/extensions"
>> external_acl_type one_conn %URI /home/carlos/script
>> acl limit external one_conn
>>
>> # where extensions have:
>>
>> \.(iso|avi|wav|mp3|mp4|mpeg|swf|flv|mpg|wma|ogg|wmv|asx|asf|deb|rpm|exe|zip|tar|tgz|rar|ppt|doc|tiff|pdf)$
>>
>> http_access deny extensions limit
>>
>>
>> So when I make squid3 -k reconfigure the squid stop working
>>
>> What can be happening ???
>
>
> * The helper needs to be running in a constant loop.
> You can find an example
> http://bazaar.launchpad.net/~squid/squid/3.2/view/head:/helpers/url_rewrite/fake/url_fake_rewrite.sh
> although that is re-writer and you do need to keep the OK/ERR for external
> ACL.

Sorry, this is my first helper, I do not understand the meaning of
running in a constant loop, in the example I see something like I do.
Making some test I found that without this line :
result=`squidclient -h 192.168.19.19 mgr:active_requests | grep -c "$1"`
the helper not crash, dont work event too, but do not crash, so i
consider this is in some way the problem.

>
> * "eq 0" - there should always be 1 request matching the URL. Which is the
> request you are testing to see if its >1 or not. You are wanting to deny for
> the case where there are *2* requests in existence.

This is true, but the way I saw was: "If the URL do not exist, so
can't be duplicate", I think isn't wrong !!

>
> * ensure you have manager requests form localhost not going through the ACL
> test.

I was making this wrong, the localhost was going through the ACL, but
I just changed !!! The problem persist, What can I do ???

>
>
> Amos
>
Received on Mon Mar 26 2012 - 21:13:55 MDT