Overview#
The LDAP Pre-Read Control is a type of supportedControl that may be attached to an LDAP Delete Request, Modify Request, or ModifyDNRequest operation to request that the server return a copy of the target entry exactly as it was immediately before the processing for that operation.It is one of the LDAP read entry controls defined in RFC 4527.
The pre-read request control has an OID of 1.3.6.1.1.13.1, and the value should be encoded in the same way as the AttributeSelection in a SearchRequest. The response control has an OID of 1.3.6.1.1.13.1 (the same as the OID for the request control), and the value should be encoded in the same was as a SearchResultEntry.
The following example shows the use of the pre-read control in an ldapmodify request:
$ ldapmodify -h localhost -p 1389 -D "cn=directory manager" -w password --preReadAttributes=telephoneNumber dn: uid=aaltay,ou=People,dc=example,dc=com changetype: modify replace: telephoneNumber telephoneNumber: +1 995 589 4444 Processing MODIFY request for uid=user.199,ou=People,dc=example,dc=com MODIFY operation successful for DN uid=aaltay,ou=People,dc=example,dc=com Target entry before the operation: dn: uid=aaltay.199,ou=People,dc=example,dc=com telephoneNumber: +1 995 589 3333
