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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 16:35:32 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 16:35:32 +0000
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+.TH LDAP 3 "RELEASEDATE" "OpenLDAP LDVERSION"
+.\" $OpenLDAP$
+.\" Copyright 1998-2022 The OpenLDAP Foundation All Rights Reserved.
+.\" Copying restrictions apply. See COPYRIGHT/LICENSE.
+.SH NAME
+ldap \- OpenLDAP Lightweight Directory Access Protocol API
+.SH LIBRARY
+OpenLDAP LDAP (libldap, \-lldap)
+.SH SYNOPSIS
+.nf
+.ft B
+#include <ldap.h>
+.ft
+.fi
+.SH DESCRIPTION
+.LP
+The Lightweight Directory Access Protocol (LDAP) (RFC 4510) provides
+access to X.500 directory services. These services may be stand\-alone
+or part of a distributed directory service. This client API supports
+LDAP over TCP (RFC 4511), LDAP over TLS/SSL, and LDAP over IPC (UNIX
+domain sockets). This API supports SASL (RFC 4513) and Start TLS
+(RFC 4513) as well as a number of protocol extensions. This API is
+loosely based upon IETF/LDAPEXT C LDAP API draft specification, a (orphaned)
+work in progress.
+.LP
+The OpenLDAP Software package includes a stand\-alone server in
+.BR slapd (8),
+various LDAP clients, and an LDAP client library used to provide
+programmatic access to the LDAP protocol. This man page gives an
+overview of the LDAP library routines.
+.LP
+Both synchronous and asynchronous APIs are provided. Also included are
+various routines to parse the results returned from these routines.
+These routines are found in the \-lldap library.
+.LP
+The basic interaction is as follows. A session handle is
+created using
+.BR ldap_initialize (3)
+and set the protocol version to 3 by calling
+.BR ldap_set_option (3).
+The underlying session is established first operation is
+issued. This would generally be a Start TLS or Bind operation,
+or a Search operation to read attributes of the Root DSE.
+A Start TLS operation is performed by calling
+.BR ldap_start_tls_s (3).
+A LDAP bind operation is performed by calling
+.BR ldap_sasl_bind (3)
+or one of its friends.
+A Search operation is performed by calling ldap_search_ext_s(3)
+or one of its friends.
+
+Subsequently, additional operations are performed
+by calling one of the synchronous or asynchronous routines (e.g.,
+.BR ldap_compare_ext_s (3)
+or
+.BR ldap_compare_ext (3)
+followed by
+.BR ldap_result (3)).
+Results returned from these routines are interpreted by calling the
+LDAP parsing routines such as
+.BR ldap_parse_result (3).
+The LDAP association and underlying connection is terminated by calling
+.BR ldap_unbind_ext (3).
+Errors can be interpreted by calling
+.BR ldap_err2string (3).
+.SH LDAP versions
+This library supports version 3 of the Lightweight Directory Access
+Protocol (LDAPv3) as defined in RFC 4510. It also supports a variant
+of version 2 of LDAP as defined by U-Mich LDAP and, to some degree,
+RFC 1777. Version 2 (all variants) are considered obsolete.
+Version 3 should be used instead.
+.LP
+For backwards compatibility reasons, the library defaults to version 2.
+Hence, all new applications (and all actively maintained applications)
+should use
+.BR ldap_set_option (3)
+to select version 3. The library manual pages assume version 3
+has been selected.
+.SH INPUT and OUTPUT PARAMETERS
+All character string input/output is expected to be/is UTF-8
+encoded Unicode (version 3.2).
+.LP
+Distinguished names (DN) (and relative distinguished names (RDN) to
+be passed to the LDAP routines should conform to RFC 4514 UTF-8
+string representation.
+.LP
+Search filters to be passed to the search routines are to be
+constructed by hand and should conform to RFC 4515 UTF-8
+string representation.
+.LP
+LDAP URLs to be passed to routines are expected to conform
+to RFC 4516 format. The
+.BR ldap_url (3)
+routines can be used to work with LDAP URLs.
+.LP
+LDAP controls to be passed to routines can be manipulated using the
+.BR ldap_controls (3)
+routines.
+.SH DISPLAYING RESULTS
+Results obtained from the search routines can be output by hand,
+by calling
+.BR ldap_first_entry (3)
+and
+.BR ldap_next_entry (3)
+to step through
+the entries returned,
+.BR ldap_first_attribute (3)
+and
+.BR ldap_next_attribute (3)
+to step through an entry's attributes, and
+.BR ldap_get_values (3)
+to retrieve a given attribute's values. Attribute values
+may or may not be displayable.
+.SH UTILITY ROUTINES
+Also provided are various utility routines. The
+.BR ldap_sort (3)
+routines are used to sort the entries and values returned via
+the ldap search routines.
+.SH DEPRECATED INTERFACES
+A number of interfaces are now considered deprecated. For instance,
+ldap_add(3) is deprecated in favor of ldap_add_ext(3).
+.so Deprecated
+.SH BER LIBRARY
+Also included in the distribution is a set of lightweight Basic
+Encoding Rules routines. These routines are used by the LDAP library
+routines to encode and decode LDAP protocol elements using the
+(slightly simplified) Basic Encoding Rules defined by LDAP. They are
+not normally used directly by an LDAP application program except
+in the handling of controls and extended operations. The
+routines provide a printf and scanf\-like interface, as well as
+lower\-level access. These routines are discussed in
+.BR lber\-decode (3),
+.BR lber\-encode (3),
+.BR lber\-memory (3),
+and
+.BR lber\-types (3).
+.SH INDEX
+.TP 20
+.SM ldap_initialize(3)
+initialize the LDAP library without opening a connection to a server
+.TP
+.SM ldap_result(3)
+wait for the result from an asynchronous operation
+.TP
+.SM ldap_abandon_ext(3)
+abandon (abort) an asynchronous operation
+.TP
+.SM ldap_add_ext(3)
+asynchronously add an entry
+.TP
+.SM ldap_add_ext_s(3)
+synchronously add an entry
+.TP
+.SM ldap_sasl_bind(3)
+asynchronously bind to the directory
+.TP
+.SM ldap_sasl_bind_s(3)
+synchronously bind to the directory
+.TP
+.SM ldap_unbind_ext(3)
+synchronously unbind from the LDAP server and close the connection
+.TP
+.SM ldap_unbind(3) and ldap_unbind_s(3) are
+equivalent to
+.BR ldap_unbind_ext (3)
+.TP
+.SM ldap_memfree(3)
+dispose of memory allocated by LDAP routines.
+.TP
+.SM ldap_compare_ext(3)
+asynchronously compare to a directory entry
+.TP
+.SM ldap_compare_ext_s(3)
+synchronously compare to a directory entry
+.TP
+.SM ldap_delete_ext(3)
+asynchronously delete an entry
+.TP
+.SM ldap_delete_ext_s(3)
+synchronously delete an entry
+.TP
+.SM ld_errno(3)
+LDAP error indication
+.TP
+.SM ldap_errlist(3)
+list of LDAP errors and their meanings
+.TP
+.SM ldap_err2string(3)
+convert LDAP error indication to a string
+.TP
+.SM ldap_extended_operation(3)
+asynchronously perform an arbitrary extended operation
+.TP
+.SM ldap_extended_operation_s(3)
+synchronously perform an arbitrary extended operation
+.TP
+.SM ldap_first_attribute(3)
+return first attribute name in an entry
+.TP
+.SM ldap_next_attribute(3)
+return next attribute name in an entry
+.TP
+.SM ldap_first_entry(3)
+return first entry in a chain of search results
+.TP
+.SM ldap_next_entry(3)
+return next entry in a chain of search results
+.TP
+.SM ldap_count_entries(3)
+return number of entries in a search result
+.TP
+.SM ldap_get_dn(3)
+extract the DN from an entry
+.TP
+.SM ldap_get_values_len(3)
+return an attribute's values with lengths
+.TP
+.SM ldap_value_free_len(3)
+free memory allocated by ldap_get_values_len(3)
+.TP
+.SM ldap_count_values_len(3)
+return number of values
+.TP
+.SM ldap_modify_ext(3)
+asynchronously modify an entry
+.TP
+.SM ldap_modify_ext_s(3)
+synchronously modify an entry
+.TP
+.SM ldap_mods_free(3)
+free array of pointers to mod structures used by ldap_modify_ext(3)
+.TP
+.SM ldap_rename(3)
+asynchronously rename an entry
+.TP
+.SM ldap_rename_s(3)
+synchronously rename an entry
+.TP
+.SM ldap_msgfree(3)
+free results allocated by ldap_result(3)
+.TP
+.SM ldap_msgtype(3)
+return the message type of a message from ldap_result(3)
+.TP
+.SM ldap_msgid(3)
+return the message id of a message from ldap_result(3)
+.TP
+.SM ldap_search_ext(3)
+asynchronously search the directory
+.TP
+.SM ldap_search_ext_s(3)
+synchronously search the directory
+.TP
+.SM ldap_is_ldap_url(3)
+check a URL string to see if it is an LDAP URL
+.TP
+.SM ldap_url_parse(3)
+break up an LDAP URL string into its components
+.TP
+.SM ldap_sort_entries(3)
+sort a list of search results
+.TP
+.SM ldap_sort_values(3)
+sort a list of attribute values
+.TP
+.SM ldap_sort_strcasecmp(3)
+case insensitive string comparison
+.SH SEE ALSO
+.BR ldap.conf (5),
+.BR slapd (8),
+.BR draft-ietf-ldapext-ldap-c-api-xx.txt \ <http://www.ietf.org>
+.SH ACKNOWLEDGEMENTS
+.so ../Project
+.LP
+These API manual pages are loosely based upon descriptions provided
+in the IETF/LDAPEXT C LDAP API Internet Draft, a (orphaned) work
+in progress.
+