slapo-retcode - return code overlay to slapd
The retcode overlay to slapd(8) is useful to test the behavior of
clients when server-generated erroneous and/or unusual responses occur,
e.g. error codes, referrals, excessive response times and so on.
The error responses are generated according to different strategies.
In the first case, all operations targeted at a specific configurable
subtree cause the object related to the request DN to be looked up and
checked for return code data: a response code, plus an optional textual
message, an optional configurable delay, an optional matched DN field,
and, when the response code is "referral", a (list of) referral(s).
Well-known response codes from standard track documents are provided in
retcode.conf, which can be included after instantiating the overlay.
In the second case, objects of classes inherited from the errAbsObject,
like errObject or errAuxObject, when returned as intermediate responses
of a search request, are changed into the response dictated by their
A third mode causes objects to be looked up from the underlying
database to discover if their class inherits from errABsObject; in that
case, their content is used to compute the corresponding response.
The behavior is disabled by using the manageDSAit control (RFC 3296);
in that case, the resulting object, either present in the directory or
dynamically generated by the overlay, or contained in the request, is
handled as usual.
The config directives that are specific to the retcode overlay must be
prefixed by retcode-, to avoid conflicts with directives specific to
the underlying database or to other stacked overlays. The following
specific directives can be used to configure the retcode overlay:
This directive defines the parent DN where dynamically generated
entries reside. If not defined, the suffix of the database is
retcode-item <RDN> <errCode> [op=<oplist>] [text=<message>]
[ref=<referral>] [sleeptime=<sec>] [matched=<DN>]
A dynamically generated entry, located below retcode-parent.
The errCode is the number of the response code; it can be in any
format supported by strtol(3). The optional oplist is a list of
operations that cause response code generation; if absent, all
operations are affected. The matched field is the matched DN
that is returned along with the error, while the text field is
an optional diagnostics message. The ref field is only allowed
for the referral response code. The sleeptime field causes
slapd(8) to sleep the specified number of seconds before
proceeding with the operation. The unsolicited field can be
used to cause the return of an RFC 4511 unsolicited response
message; if OID is not "0", an extended response is generated,
with the optional data appended. If flags contains disconnect,
or pre-disconnect, slapd(8) disconnects abruptly, without
notice; post-disconnect causes disconnection right after sending
response as appropriate.
Enables exploitation of in-directory stored errAbsObject. May
result in a lot of unnecessary overhead.
Defines a sleep time in seconds that is spent before actually
handling any operation. If negative, a random time between 0
and the absolute value of the argument is used.
The retcode overlay utilizes the "return code" schema described herein.
This schema is specifically designed for use with this overlay and is
not intended to be used otherwise. It is also noted that the schema
described here is a work in progress, and hence subject to change
without notice. The schema is loaded automatically by the overlay.
The schema includes a number of object classes and associated attribute
types as described below.
The error code:
NAME ( 'errCode' )
DESC 'LDAP error code'
The operations that trigger the response code:
NAME ( 'errOp' )
DESC 'Operations the errObject applies to'
SYNTAX 220.127.116.11.4.1.1418.104.22.168.15 )
The text message:
NAME ( 'errText' )
DESC 'LDAP error textual description'
The sleep time before the response is actually returned to the client:
NAME ( 'errSleepTime' )
DESC 'Time to wait before returning the error'
The matched DN returned to the client:
NAME ( 'errMatchedDN' )
DESC 'Value to be returned as matched DN'
The OID to be returned as extended response OID in RFC 4511 unsolicited
responses ("0" generates a regular response with msgid set to 0):
NAME ( 'errUnsolicitedOID' )
DESC 'OID to be returned within unsolicited response'
The octet string to be returned as extended response data in RFC 4511
NAME ( 'errUnsolicitedData' )
DESC 'Data to be returned within unsolicited response'
If TRUE, slapd(8) disconnects abruptly without notice; if FALSE, it
disconnects after sending response as appropriate:
NAME ( 'errDisconnect' )
DESC 'Disconnect without notice'
The abstract class that triggers the overlay:
NAME ( 'errAbsObject' )
SUP top ABSTRACT
MUST ( errCode )
MAY ( cn $ description $ errOp $ errText $ errSleepTime
$ errMatchedDN ) )
The standalone structural objectclass for specifically created data:
NAME ( 'errObject' )
SUP errAbsObject STRUCTURAL )
The auxiliary objectclass to alter the behavior of existing objects:
NAME ( 'errAuxObject' )
SUP errAbsObject AUXILIARY )
# retcode.conf is found in tests/data/ of the source tree
# Wait 10 seconds, then return success (0x00)
retcode-item "cn=Success after 10 seconds" 0x00 sleeptime=10
# Wait 10 seconds, then return timelimitExceeded (0x03)
retcode-item "cn=Timelimit after 10 seconds" 0x03 sleeptime=10
default slapd configuration file
slapd.conf(5), slapd-config(5), slapd(8). The slapo-retcode(5) overlay
supports dynamic configuration via back-config.
This module was written in 2005 by Pierangelo Masarati for SysNet