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deoren
Apprentice
Joined: 23 Dec 2004
Posts: 227
Location: USA
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 Posted: Wed Feb 08, 2006 5:23 pm Post subject: mod_rewrite and image linking [SOLVED] |
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First of all thanks for reading this post!
I searched the forums and did not find what I was looking for.
I'm wanting to replace all images that others link to from my site with an alternate image. I have found the same posting on various corners of the web but I can't seem to get them to work.
Here is a snippet from the Apache Cookbook errata page:
| Code: | SetEnvIfNoCase Referer "^http://([^/]*\.)?myserver.com/" local_referrer=1
RewriteRule %{ENV:local_referrer} !=1 /Stolen-100x100.png [L] |
mod_rewrite is loaded and is in the config file earlier on.
I get this error when trying to restart apache2:
| Code: | | /etc/init.d/apache2 restart |
| Quote: | * Apache2 has detected a syntax error in your configuration files:
Syntax error on line 79 of /usr/lib/apache2/conf/vhosts.d/myserver.com/1_www.conf:
RewriteRule: bad flag delimiters |
I'm too ignorant of mod_rewrite rules to know what's the fix for this. Tips/suggestions are most welcome!
BTW, this works to deny image linking with a 403 error but isn't quite what I'm looking for.
| Code: | <FilesMatch "\.(jpg|jpeg|gif|png)$">
SetEnvIfNoCase Referer "^http://([^/]*\.)?myserver.com/" local_referrer=1
Order Allow,Deny
Allow from env=local_referrer
</FilesMatch> |
Last edited by deoren on Tue Feb 14, 2006 1:39 am; edited 1 time in total |
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goma
n00b
Joined: 04 Feb 2006
Posts: 56
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| Posted: Wed Feb 08, 2006 10:53 pm Post subject: |
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| At first glance, I wonder if the space before the "!=1" is messing things up. Remove the space and see if that fixes the problem. |
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deoren
Apprentice
Joined: 23 Dec 2004
Posts: 227
Location: USA
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| Posted: Thu Feb 09, 2006 11:42 am Post subject: |
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Thank you for your suggestion, but unfortunately the rule does nothing with that space removed.
Just to be clear here is what I tried:
| Code: | <FilesMatch "\.(jpg|jpeg|gif|png)$">
SetEnvIfNoCase Referer "^http://([^/]*\.)?mydomain.com/" local_referrer=1
RewriteRule %{ENV:local_referrer}!=1 /images/linking_denied.png [L]
</FilesMatch> |
If I place the space back I get the error mentioned previously. Other ideas? |
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goma
n00b
Joined: 04 Feb 2006
Posts: 56
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| Posted: Thu Feb 09, 2006 1:02 pm Post subject: |
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Give this a try:
| Code: | <FilesMatch "\.(jpg|jpeg|gif|png)$">
SetEnvIfNoCase Referer "^http://([^/]*\.)?mydomain.com/" local_referrer=1
RewriteCond %{local_referrer} !^1$
RewriteRule ^/.*$ /images/linking_denied.png [L]
</FilesMatch>
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deoren
Apprentice
Joined: 23 Dec 2004
Posts: 227
Location: USA
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| Posted: Thu Feb 09, 2006 1:43 pm Post subject: |
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Thanks again, but no such luck.
Here is a little more info that may help:
Example of the url layout: http://www.mydomain.com/_images/animals/cats/cat.gif
I have an alias like so:
| Code: | | Alias /images /var/www/mydomain.com/shared/images/ |
Using this:
| Code: | <FilesMatch "\.(jpg|jpeg|gif|png)$">
SetEnvIfNoCase Referer "^http://([^/]*\.)?mydomain.com/" local_referrer=1
RewriteCond %{local_referrer} !^1$
RewriteRule ^/.*$ /images/linking_denied.png [L]
</FilesMatch> |
does not block the image from being used. I also cleared my cache to make sure that wasn't the issue. |
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deoren
Apprentice
Joined: 23 Dec 2004
Posts: 227
Location: USA
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| Posted: Sun Feb 12, 2006 8:58 pm Post subject: |
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I'm not sure that I've solved my problem, but so far this seems to do the trick:
| Code: | # Stop image/bandwidth theft.
RewriteCond %{HTTP_REFERER} !^http://([^/]*\.)?mydomain.com/.*$ [NC]
RewriteCond %{REQUEST_URI} !^/images/linking_denied.png$ [NC]
RewriteRule .(gif|jpg|jpeg|png)$ http://www.mydomain.com/images/linking_denied.png [L] |
I've cobbled together different pieces of examples from the Apache docs and other info I found scattered about the web.
In order to use the FilesMatch directive I would have to use these directives within that container:
| Code: | RewriteEngine on
Options FollowSymLinks |
These directives would combine like so:
| Code: | <FilesMatch "\.(gif|jpe?g|png)$">
RewriteEngine on
Options FollowSymLinks
# Stop image/bandwidth theft.
RewriteCond %{HTTP_REFERER} !^http://([^/]*\.)?mydomain.com/.*$ [NC]
RewriteCond %{REQUEST_URI} !^/images/linking_denied.png$ [NC]
RewriteRule .(gif|jpg|jpeg|png)$ http://www.mydomain.com/images/linking_denied.png [L]
</FilesMatch> |
It works to also write it this way:
| Code: | <FilesMatch "\.(gif|jpe?g|png)$">
RewriteEngine on
Options FollowSymLinks
# Stop image/bandwidth theft.
RewriteCond %{HTTP_REFERER} !^http://([^/]*\.)?mydomain.com/.*$ [NC]
RewriteCond %{REQUEST_URI} !^/images/linking_denied.png$ [NC]
RewriteRule ^/.*$ http://www.mydomain.com/images/linking_denied.png [L]
</FilesMatch> |
and lastly if you have several virtual hosts that make use of an /images alias:
| Code: | <FilesMatch "\.(gif|jpe?g|png)$">
RewriteEngine on
Options FollowSymLinks
# Stop image/bandwidth theft.
RewriteCond %{HTTP_REFERER} !^http://([^/]*\.)?mydomain.com/.*$ [NC]
RewriteCond %{REQUEST_URI} !^/images/linking_denied.png$ [NC]
RewriteRule ^/.*$ http://%{SERVER_NAME}/images/linking_denied.png [L]
</FilesMatch> |
The only thing I haven't figured out how to do is have linking_denied.png not processed again once the redirect has been sent to the site visitor.
These two directives were invaluable in determining where the problem was:
| Code: | RewriteLog /var/www/mydomain.com/logs/www.rewrite.log
RewriteLogLevel 4 |
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