Last modified: 2011-01-25 00:59:18 UTC

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Bug 850 - Circular redirects not caught between wikis
Circular redirects not caught between wikis
Product: MediaWiki
Classification: Unclassified
Redirects (Other open bugs)
All All
: Normal minor with 1 vote (vote)
: ---
Assigned To: Nobody - You can work on this!
Depends on:
  Show dependency treegraph
Reported: 2004-11-10 01:27 UTC by M. Creidieki Crouch
Modified: 2011-01-25 00:59 UTC (History)
4 users (show)

See Also:
Web browser: ---
Mobile Platform: ---
Assignee Huggle Beta Tester: ---


Description M. Creidieki Crouch 2004-11-10 01:27:08 UTC
If you create pages on two wikis which redirect to each other, the browser goes
into an infinite loop of redirecting between them.  Please see attached page for
Comment 1 Brion Vibber 2004-11-10 03:12:41 UTC
This is a symptom of there not really being a way to signal the destination (which may not 
even be a MediaWiki -- or a wiki at all) that it's the target of a redirect rather than just a 
link. Another symptom is that if you want to go back to the redirecting page to change it 
you have to manually cobble together the URL.

It's possible that we could add some kind of URL marker which would be MediaWiki-
specific to let the destination know where it came from, and either enable it only 
sometimes or just tack it on for any interwiki redirect.
Comment 2 lɛʁi לערי ריינהארט 2004-11-10 03:46:03 UTC
I worked in telecommunication and handeled cyclic routing between independend 
carriers. If you are able to identify users (both loged in and anonymuos) and 
remember the last requested page together with a timestamp implement both a 
trashold for the time and a number of maximal attempts you are able to 
generate an alarm for that page.

Sysops could verify that page and see if it redirects (also to a external 
destination). This way you can correct them.

This is an issue of a malicious attac too and should be handeled with special 

Exceptions: If a page is generated (viewed in the preview or saved) templates 
could be requested multiple times (800 times, see [[bug 95]]).

Regards Reinhardt
Comment 3 Brion Vibber 2004-11-10 06:36:50 UTC
That's totally irrelevant; the user agent gives up after several levels deep, and there are other issues 
to deal with (backlink) which would render this moot. I have no idea what templates are supposed to 
do with this.
Comment 4 Rowan Collins [IMSoP] 2004-11-10 18:33:42 UTC
(In reply to comment #1)
> It's possible that we could add some kind of URL marker which would be MediaWiki-
> specific to let the destination know where it came from, and either enable it
> sometimes or just tack it on for any interwiki redirect.

Hmm... I think maybe it would be a good idea to:
1) limit interwiki redirects to only specifically allowed prefixes (i.e. only
allow redirects to other Wikimedia Foundation projects); this just needs a flag
in the appropriate db table - in fact, isn't there already one for "local" or
somesuch? would that indicate the right subset? I was surprised to find that
"#REDIRECT [[Google:foo]]" actually works right now...

2) treat interwiki redirects differently from normal interwiki links, and (since
with [1] implemented we can be sure they're running MW) append an extra
argument, like "&redirectedfrom=Project:Pagename", where "Project:" is the
interwiki prefix of the source (which should be $wgLocalInterwiki, I presume).
Then, when a page is requested with that argument, it can be rendered as though
it were a normal redirected page: don't accept further "#REDIRECT"s, display
"redirected from [[Project:Pagename]]", etc. There should probably also be a
check that "Project:Pagename" corresponded to a valid "local" interwiki target
(i.e. one that could be redirected to, and is therefore plausibly being
redirected from) to avoid any weird URL spoofing tricks.
Comment 5 lɛʁi לערי ריינהארט 2005-06-09 06:44:58 UTC
This seems to be fixed. See .
Comment 6 lɛʁi לערי ריינהארט 2005-06-09 06:48:06 UTC
The changes made here might be the cause of
Bug 2342: w:he:(aleph) is a valid interwiki link at en: but not at other wiki's
Comment 7 Rowan Collins [IMSoP] 2005-06-09 15:56:48 UTC
(In reply to comment #5)
> This seems to be fixed. See .

Yes, I think the "only redirect to local projects" part was implemented some
time ago; don't know about the circular (but "local") redirect business though.
Comment 8 lɛʁi לערי ריינהארט 2005-06-12 12:00:08 UTC
This bug is still open:
[[yi:User:Gangleri]] includes [[en:meta:User:Gangleri]] which shows as a
interwiki to [[en:]] but redirects to [[meta:User:Gangleri]]

Regards Reinhardt
Comment 9 lɛʁi לערי ריינהארט 2005-06-12 12:03:40 UTC
addition to comment 8

This bug is still open:
[[yi:User:Gangleri]] includes *there* [[en:meta:User:Gangleri]] which shows as a
interwiki to [[en:]] *in the other languages* part but redirects to

P.S. No not mix with *what you get* if you click on the links at bugzilla.

Regards Reinhardt
Comment 10 lɛʁi לערי ריינהארט 2006-01-21 14:56:57 UTC
This bug is referred at bug 2701 comment 2
Bug 2701: Interwiki redirects redirect to local page with interwiki title

The new examples at
are similar to those from comment 8 and comment 9 but are *neither* explicite
REDIRECTs and *nor* circular.

These are just hacked constructs that redirect trough a chain of wikies.

best regards reinhardt [[user:gangleri]]
Comment 11 Brion Vibber 2006-01-22 04:26:28 UTC
Restored bug from flood attack.
Comment 12 Andrew Garrett 2006-10-27 09:57:07 UTC
Interwiki redirects can no longer exist. Resolving as FIXED.
Comment 13 Rotem Liss 2006-10-27 11:34:04 UTC
(In reply to comment #12)
> Interwiki redirects can no longer exist. Resolving as FIXED.

As far as I understand, they are exist, but not enabled on Wikimedia. This bug
is about MediaWiki in general, though. Reopening.
Comment 14 MZMcBride 2009-01-06 22:53:01 UTC
I'm quite confused about this bug. r7707 seems to have fixed this issue long ago. Otherwise, the bug summary is simply wrong or misleading.
Comment 15 Mike.lifeguard 2009-03-23 01:50:50 UTC
Marked FIXED per comment 14.

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