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From "Stefan Seelmann (JIRA)" <>
Subject [jira] Commented: (DIRSERVER-803) Creating an alias from a child entry to the ancestor causes an error (return code 36)
Date Sun, 03 May 2009 20:58:30 GMT


Stefan Seelmann commented on DIRSERVER-803:

I'm working on alias issues, see DIRSERVER-1355 and DIRSERVER-1349.

I think the detection of cycles during search isn't that hard, the algorithm is described

I already implemented it for the SubtreeScopeCursor: The idea is to collect a list of all
search bases that are relevant for a subtree search, create a cursor for each base and switch
between these cursors. Therefore I use the ID of the provided search base and recursively
get all dereferenced aliases using the subtree alias index. Only if the dereferenced alias
extends the search scope it is added to the list. Additional descendants of the added search
scope are removed from the list. The cycle detection is simple because we only need to check
if a dereferenced alias is already contained in this list. In that case we could just quit
the current recursion.

I would voluneer for this issue. The SubtreeScopeCursor implementation seems to work, I just
add some more test cases and check the behaviour of other LDAP servers. Atm I don't understand
what the SubtreeScopeEvaluator is used for...

> Creating an alias from a child entry to the ancestor causes an error (return code 36)
> -------------------------------------------------------------------------------------
>                 Key: DIRSERVER-803
>                 URL:
>             Project: Directory ApacheDS
>          Issue Type: Bug
>          Components: core
>    Affects Versions: 1.5.1, 1.5.0, 1.0.2, 1.0.1, 1.0
>         Environment: * ApacheDS 1.0.0
> * Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_07-b03)
> * Windows XP Professional SP2
>            Reporter: Stefan Zoerner
>            Assignee: Alex Karasulu
>             Fix For: 1.5.5
>         Attachments:
> It fails to import the following two entries into ApacheDS 1.0 (default server.xml).

> The second entry is an alias to the first one, and is directly located below the first
> dn: ou=Singers,dc=example,dc=com
> ou: Singers
> objectclass: top
> objectclass: organizationalUnit
> dn: ou=Songwriters,ou=Singers,dc=example,dc=com
> ou: Songwriters
> objectclass: top
> objectclass: organizationalUnit
> objectclass: alias
> aliasedobjectname: ou=Singers,dc=example,dc=com
> Here is the result I got from an ldapmodify attempt:
> $ ldapmodify -h localhost -p 10389 -D "uid=admin,ou=system" -w ****** -q -c -a -f aliasSingers.ldif
> ldap_add: Unknown error
> ldap_add: additional info: failed to add entry ou=Songwriters,ou=Singers,dc=example,dc=com:
[36] aliasDereferencingProblem - attempt to create alias with cycle to relative ou=Singers,dc=example,dc=com
not allowed from descendent alias,,0.9.2342.19200300.100.1.25=example,0.9.2342.19200300.100.1.25=com
> It seems that ApacheDS does not allow to create an alias from a descendant. I tried the
same with Tivoli Directory Server 6.0 and Sun Java System Directory Server 5.2, both allowed
this constellation.
> Find attached a JNDI JUnit test which is able to cause the error by adding two entries

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