<IfDefine env=...> & RewriteRule/Redirect - Question

Ok I'm trying to setup an anti leech protection. I already got one
working with a .htaccess file just setting an eviormente variable
depending on the referer and if it is not set just deny the user.

*code*
SetEnvIf referer ^http://gallery\.amonamarth\.de let_me_in
Order Deny,Allow
Deny from all
Allow from env=let_me_in
*code*

Easy one, but I want it a bit more tricky, the anti leech is primary for
the pictures, so the .htaccess file is located in my /img/ directory. I
also got another directory with an image, this is /images/antileech.jpg.
So what I want is that when someone for example posts a picture
somewhere in a forum located on my server in the /img/ directory, the
enviorment variable is not set so the rewrite jumps in and sends him
/images/antileech.jpg, so he knows he'd host the picture by himself.
So I crawled through some stuff, what I tried is the following:

*code*
SetEnvIfNoCase Referer ^http://gallery\.amonamarth\.de let_me_in
<IfDefine env=!let_me_in>
RewriteRule ^/img/.*$ http://www.amonamarth.de/images/antileech.jpg
</IfDefine>
*code*

I have problems with the <IfDefine env=*> and with the RewriteRule
thing, I tried also different combinations.
<IfDefine env=!let_me_in>
<IfDefine !env=let_me_in>
<IfDefine !let_me_in>
None is working right, as I thought it should. Can you give me the
correct form of this?
The RewriteRule is also not doing what I want, I'm not too familliar
with mod_rewrite yet as I never worked very much with it (I also tried a
redirect but also not doing it). So can you help me with that one too?

Thanks

On Fri, 04 Mar 2005 22:53:23 +0100, in alt.apache.configuration,
Alexander Scheurer <mail@aspepex.net> wrote:

<snip>

>Easy one, but I want it a bit more tricky, the anti leech is primary for
>the pictures, so the .htaccess file is located in my /img/ directory. I
>also got another directory with an image, this is /images/antileech.jpg.
>So what I want is that when someone for example posts a picture
>somewhere in a forum located on my server in the /img/ directory, the
>enviorment variable is not set so the rewrite jumps in and sends him
>/images/antileech.jpg, so he knows he'd host the picture by himself.
>So I crawled through some stuff, what I tried is the following:
>
>*code*
>SetEnvIfNoCase Referer ^http://gallery\.amonamarth\.de let_me_in
><IfDefine env=!let_me_in>
>RewriteRule ^/img/.*$ http://www.amonamarth.de/images/antileech.jpg
></IfDefine>
>*code*
>
>I have problems with the <IfDefine env=*> and with the RewriteRule
>thing, I tried also different combinations.
><IfDefine env=!let_me_in>
><IfDefine !env=let_me_in>
><IfDefine !let_me_in>
>None is working right, as I thought it should. Can you give me the
>correct form of this?
>The RewriteRule is also not doing what I want, I'm not too familliar
>with mod_rewrite yet as I never worked very much with it (I also tried a
>redirect but also not doing it). So can you help me with that one too?


Try using RewriteCond (untested, but I use similar rules in my
config):
RewriteCond %{HTTP_REFERER} !^http://gallery\.amonamarth\.de [NC]
RewriteRule ^/img/ http://www.amonamarth.de/images/antileech.jpg

FYI, I've read that some browsers can be configured not to supply the
HTTP_REFERER header. You will be prohibiting them from access your
images.

HTH,
Jim

Jim Hayter wrote:
> Try using RewriteCond (untested, but I use similar rules in my
> config):
> RewriteCond %{HTTP_REFERER} !^http://gallery\.amonamarth\.de [NC]
> RewriteRule ^/img/ http://www.amonamarth.de/images/antileech.jpg
>
> FYI, I've read that some browsers can be configured not to supply the
> HTTP_REFERER header. You will be prohibiting them from access your
> images.

Thanks alot you sent me to the right direction, after trying a bit I
asked Google for help on the RewriteCond and found this page:
http://www.trafficklau.de/htaccess.html (German)

They got 2 solutions for my problem.

1. RewriteCond

*code*
RewriteEngine on
RewriteCond %{HTTP_REFERER} !^$
RewriteCond %{HTTP_REFERER} !^http://(www\.)?trafficklau\.de(/.*)?$ [NC]
RewriteRule \.(gif|jpg|GIF|JPG)$
http://www.trafficklau.de/images/ersatz.gif [R,L]
*code*

2. SetEnvIf(NoCase)

*code*
<Files ~ "\.(gif|jpe?g|png)$">
ErrorDocument 403 http://www.trafficklau.de/ersatzgrafik.gif
SetEnvIfNoCase Referer "^http://www.trafficklau.de" local_ref=1
SetEnvIfNoCase Referer "^http://trafficklau.de" local_ref=1 Order
Allow,Deny Allow from env=local_ref
</Files>
*code*

I think I would have never come to the conclusion to just add the
ErrorDocument 403 to the thing I already had.

Thanks again

Alex