(ITS#3628) overlay to expand url during search

[sebastien.georget@sophia.inria.fr]

Full_Name: Sebastien Georget
Version: 2.2.20
OS: RHEL 3
URL: http://www-sop.inria.fr/dream/personnel/Sebastien.Georget/contribs/expandUrl-0.2.c
Submission from: (NULL) (138.96.66.17)


This small overlay follow URL attributes during a search operation. It was
written to define (merge) groups this way :

   dn: cn=test,ou=Group,dc=test
   memberURL: ldap:///cn=test,ou=Group,o=org1,dc=test
   memberURL: ldap:///cn=test,ou=Group,o=org2,dc=test
 
   dn: cn=test,ou=Group,o=org1,dc=test
   memberUid: bob
 
   dn: cn=test,ou=Group,o=org2,dc=test
   memberUid: alice


The overlay is configured with the following directives in slapd.conf :
   moduleload expandUrl
   overlay expandUrl
   expandUrl dn attr1 attr2

The 3 parameters are :
  - dn : the overlay will only operate on this dn
  - attr1 : the overlay will look for URIs in this attribute
            only the dn part of the uri is used
  - attr2 : if target URIs contain this attribute the
            values are merged in dn

Once configured the result of ldapsearch -x -b "ou=Group,dc=test" is :
 dn: cn=test,ou=Group,dc=test
 memberURL: ldap:///cn=test,ou=Group,o=org1,dc=test
 memberURL: ldap:///cn=test,ou=Group,o=org2,dc=test
 memberUid: bob
 memberUid: alice