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ldap_search, ldap_search_s, ldap_search_st, ldap_search_ext,
ldap_search_ext_s - Perform an LDAP search operation
OpenLDAP LDAP (libldap, -lldap)
struct timeval *timeout,
int *msgidp );
struct timeval *timeout,
LDAPMessage **res );
These routines are used to perform LDAP search operations. The
ldap_search_ext_s() routine does the search synchronously (i.e., not
returning until the operation completes), providing a pointer to the
resulting LDAP messages at the location pointed to by the res parame-
The ldap_search_ext() routine is the asynchronous version, initiating
the search and returning the message id of the operation it initiated
in the integer pointed to by the msgidp parameter.
The base parameter is the DN of the entry at which to start the search.
The scope parameter is the scope of the search and should be one of
LDAP_SCOPE_BASE, to search the object itself, LDAP_SCOPE_ONELEVEL, to
search the object's immediate children, LDAP_SCOPE_SUBTREE, to search
the object and all its descendants, or LDAP_SCOPE_CHILDREN, to search
all of the descendants. Note that the latter requires the server sup-
port the LDAP Subordinates Search Scope extension.
The filter is a string representation of the filter to apply in the
search. The string should conform to the format specified in RFC 4515
as extended by RFC 4526. For instance, "(cn=Jane Doe)". Note that use
of the extension requires the server to support the LDAP Absolute
True/False Filter extension. NULL may be specified to indicate the
library should send the filter (objectClass=*).
The attrs parameter is a null-terminated array of attribute descrip-
tions to return from matching entries. If NULL is specified, the
return of all user attributes is requested. The description "*"
(LDAP_ALL_USER_ATTRIBUTES) may be used to request all user attributes
to be returned. The description "+"(LDAP_ALL_OPERATIONAL_ATTRIBUTES)
may be used to request all operational attributes to be returned. Note
that this requires the server to support the LDAP All Operational
Attribute extension. To request no attributes, the description "1.1"
(LDAP_NO_ATTRS) should be listed by itself.
The attrsonly parameter should be set to a non-zero value if only
attribute descriptions are wanted. It should be set to zero (0) if
both attributes descriptions and attribute values are wanted.
The serverctrls and clientctrls parameters may be used to specify
server and client controls, respectively.
The ldap_search_ext_s() routine is the synchronous version of
It also returns a code indicating success or, in the case of failure,
indicating the nature of the failure of the operation. See
ldap_error(3) for details.
Note that both read and list functionality are subsumed by these rou-
tines, by using a filter like "(objectclass=*)" and a scope of
LDAP_SCOPE_BASE (to emulate read) or LDAP_SCOPE_ONELEVEL (to emulate
These routines may dynamically allocate memory. The caller is responsi-
ble for freeing such memory using supplied deallocation routines.
Return values are contained in <ldap.h>.
Note that res parameter of ldap_search_ext_s() and ldap_search_s()
should be freed with ldap_msgfree() regardless of return value of these
The ldap_search() routine is deprecated in favor of the
ldap_search_ext() routine. The ldap_search_s() and ldap_search_st()
routines are deprecated in favor of the ldap_search_ext_s() routine.
Deprecated interfaces generally remain in the library. The macro
LDAP_DEPRECATED can be defined to a non-zero value (e.g., -DLDAP_DEPRE-
CATED=1) when compiling program designed to use deprecated interfaces.
It is recommended that developers writing new programs, or updating old
programs, avoid use of deprecated interfaces. Over time, it is
expected that documentation (and, eventually, support) for deprecated
interfaces to be eliminated.
ldap(3), ldap_result(3), ldap_error(3)
OpenLDAP Software is developed and maintained by The OpenLDAP Project
<http://www.openldap.org/>. OpenLDAP Software is derived from the Uni-
versity of Michigan LDAP 3.3 Release.
OpenLDAP 2.4.50 2020/04/28 LDAP_SEARCH(3)