[semi-OT]: Transparent proxy: SQUID & IPTABLES

[semi-OT]: Transparent proxy: SQUID & IPTABLES

[Giovanni Costagliola]

Hello all,

            I'm attempting to configure a transparent proxy on my lan.

 

Default gateway and proxy reside on the same machine.

 

I issued the following iptables command:

 

iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 80 -j REDIRECT
--to-ports 8080

 

where interface eth0 is the one that gateways internal clients.

 

I receive a stupid message by squid caused by incorrect URL syntax.

 

It seems that getting an URL such as:

 

http://www.google.it/search?sourceid=navclient
<http://www.google.it/search?sourceid=navclient&hl=it&ie=UTF-8&q=foobar>
&hl=it&ie=UTF-8&q=foobar

 

reach Squid layer as

 

/search?sourceid=navclient&hl=it&ie=UTF-8&q=foobar

 

Missing of the protocol and host part!

 

How is it possible?

 

cya

*g

  :\ Giovanni Costagliola
_______________________
The worst disease for a thinking male?
Deductio Precox
   -- *g

 

Re: [semi-OT]: Transparent proxy: SQUID & IPTABLES

[Emilio Casbas]

Giovanni Costagliola wrote:

>Hello all,
>
>            I'm attempting to configure a transparent proxy on my lan.
>
> 
>
>Default gateway and proxy reside on the same machine.
>
> 
>
>I issued the following iptables command:
>
> 
>
>iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 80 -j REDIRECT
>--to-ports 8080
>
> 
>
>where interface eth0 is the one that gateways internal clients.
>
> 
>
>I receive a stupid message by squid caused by incorrect URL syntax.
>
> 
>
>It seems that getting an URL such as:
>
> 
>
>http://www.google.it/search?sourceid=navclient
><http://www.google.it/search?sourceid=navclient&hl=it&ie=UTF-8&q=foobar>
>&hl=it&ie=UTF-8&q=foobar
>
> 
>
>reach Squid layer as
>
> 
>
>/search?sourceid=navclient&hl=it&ie=UTF-8&q=foobar
>
> 
>
>Missing of the protocol and host part!
>
> 
>
>How is it possible?
>
> 
>
>  
>
This is a tipical proxy request
You have to configure squid to accept HTTP requests
with partial URIs.

see http://www.squid-cache.org/Doc/FAQ/FAQ-17.html

Thanks
Emilio C.

Re: [semi-OT]: Transparent proxy: SQUID & IPTABLES

[Emilio Casbas]

Emilio Casbas wrote:

> Giovanni Costagliola wrote:
>
>> Hello all,
>>
>>            I'm attempting to configure a transparent proxy on my lan.
>>
>>
>>
>> Default gateway and proxy reside on the same machine.
>>
>>
>>
>> I issued the following iptables command:
>>
>>
>>
>> iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 80 -j REDIRECT
>> --to-ports 8080
>>
>>
>>
>> where interface eth0 is the one that gateways internal clients.
>>
>>
>>
>> I receive a stupid message by squid caused by incorrect URL syntax.
>>
>>
>>
>> It seems that getting an URL such as:
>>
>>
>>
>> http://www.google.it/search?sourceid=navclient
>> <http://www.google.it/search?sourceid=navclient&hl=it&ie=UTF-8&q=foobar>
>> &hl=it&ie=UTF-8&q=foobar
>>
>>
>>
>> reach Squid layer as
>>
>>
>>
>> /search?sourceid=navclient&hl=it&ie=UTF-8&q=foobar
>>
>>
>>
>> Missing of the protocol and host part!
>>
>>
>>
>> How is it possible?
>>
>>
>>
>>  
>>
Sorry.
This is a tipical web request

> You have to configure squid to accept HTTP requests
> with partial URIs.
>
> see http://www.squid-cache.org/Doc/FAQ/FAQ-17.html


Thanks
Emilio C.