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slapo-valsort(5)


NAME

   slapo-valsort - Value Sorting overlay to slapd

SYNOPSIS

   /etc/ldap/slapd.conf

DESCRIPTION

   The  Value  Sorting overlay can be used with a backend database to sort
   the values of specific multi-valued attributes within  a  subtree.  The
   sorting  occurs  whenever  the  attributes  are  returned  in  a search
   response.

   Sorting can be specified in ascending or descending order, using either
   numeric  or  alphanumeric sort methods. Additionally, a "weighted" sort
   can be  specified,  which  uses  a  numeric  weight  prepended  to  the
   attribute  values.   The weighted sort is always performed in ascending
   order, but may be combined with the other methods for values  that  all
   have  equal  weights.  The weight is specified by prepending an integer
   weight {<weight>} in front of each value of  the  attribute  for  which
   weighted  sorting is desired. This weighting factor is stripped off and
   not returned in search results unless the valsort control is  specified
   (1.3.6.1.4.1.4203.666.5.14).

   The  valsort  control  requires  a  value consisting of a Sequence that
   contains a boolean flag. The weighting factor is only returned  if  the
   boolean  value  is  TRUE.  In lber-encode(3) format, the required value
   must conform to "{b}" syntax.

CONFIGURATION

   These slapd.conf options apply to  the  Value  Sorting  overlay.   They
   should appear after the overlay directive.

   valsort-attr  <attribute>  <baseDN>  (<sort-method>  | weighted [<sort-
   method>])
          Configure a sorting method for the specified  attribute  in  the
          subtree  rooted  at  baseDN.   The  sort-method  may  be  one of
          alpha-ascend, alpha-descend, numeric-ascend, or numeric-descend.
          If  the  special weighted method is specified, a secondary sort-
          method may also be specified. It  is  an  error  to  specify  an
          alphanumeric  sort-method  for  an  attribute  with  Integer  or
          NumericString syntax, and it is an error to  specify  a  numeric
          sort-method for an attribute with a syntax other than Integer or
          NumericString.

EXAMPLES

        database bdb
        suffix dc=example,dc=com
        ...
        overlay valsort
        valsort-attr member ou=groups,dc=example,dc=com alpha-ascend

   To invoke ldapsearch(1) with the valsort  control,  the  control  value
   must  be set appropriately.  The following octets represent the desired
   "{b}" encoding:

        0x30 0x03 0x01 0x01 0xff

   The control can be sent from the command-line using the base64 encoding
   of the value:

        ldapsearch -E 1.3.6.1.4.1.4203.666.5.14=::MAMBAf8=

FILES

   /etc/ldap/slapd.conf
          default slapd configuration file

SEE ALSO

   slapd.conf(5), slapd-config(5).

ACKNOWLEDGEMENTS

   This module was written in 2005 by Howard Chu of Symas Corporation. The
   work was sponsored by Stanford University.



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