SLAPO-VALSORT(5) File Formats Manual 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 re-
sponse.
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 attri-
bute 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 re-
turned 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 con-
tains 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 al-
pha-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 al-
phanumeric sort-method for an attribute with Integer or Numeric-
String syntax, and it is an error to specify a numeric sort-
method for an attribute with a syntax other than Integer or Nu-
mericString.
EXAMPLES
database mdb
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.
OpenLDAP 2.5.13+dfsg-5 2022/07/14 SLAPO-VALSORT(5)
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