|LDAP(3)||Library Functions Manual||LDAP(3)|
The OpenLDAP Software package includes a stand-alone server in 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.
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.
The basic interaction is as follows. A session handle is created using ldap_initialize(3) and set the protocol version to 3 by calling 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 ldap_start_tls_s(3). A LDAP bind operation is performed by calling 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., ldap_compare_ext_s(3) or ldap_compare_ext(3) followed by ldap_result(3)). Results returned from these routines are interpreted by calling the LDAP parsing routines such as ldap_parse_result(3). The LDAP association and underlying connection is terminated by calling ldap_unbind_ext(3). Errors can be interpreted by calling ldap_err2string(3).
For backwards compatibility reasons, the library defaults to version 2. Hence, all new applications (and all actively maintained applications) should use ldap_set_option(3) to select version 3. The library manual pages assume version 3 has been selected.
Distinguished names (DN) (and relative distinguished names (RDN) to be passed to the LDAP routines should conform to RFC 4514 UTF-8 string representation.
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.
LDAP URLs to be passed to routines are expected to conform to RFC 4516 format. The ldap_url(3) routines can be used to work with LDAP URLs.
LDAP controls to be passed to routines can be manipulated using the ldap_controls(3) routines.
- initialize the LDAP library without opening a connection to a server
- wait for the result from an asynchronous operation
- abandon (abort) an asynchronous operation
- asynchronously add an entry
- synchronously add an entry
- asynchronously bind to the directory
- synchronously bind to the directory
- synchronously unbind from the LDAP server and close the connection
- ldap_unbind(3) and ldap_unbind_s(3) are
- equivalent to ldap_unbind_ext(3)
- dispose of memory allocated by LDAP routines.
- asynchronously compare to a directory entry
- synchronously compare to a directory entry
- asynchronously delete an entry
- synchronously delete an entry
- LDAP error indication
- list of LDAP errors and their meanings
- convert LDAP error indication to a string
- asynchronously perform an arbitrary extended operation
- synchronously perform an arbitrary extended operation
- return first attribute name in an entry
- return next attribute name in an entry
- return first entry in a chain of search results
- return next entry in a chain of search results
- return number of entries in a search result
- extract the DN from an entry
- return an attribute's values with lengths
- free memory allocated by ldap_get_values_len(3)
- return number of values
- asynchronously modify an entry
- synchronously modify an entry
- free array of pointers to mod structures used by ldap_modify_ext(3)
- asynchronously rename an entry
- synchronously rename an entry
- free results allocated by ldap_result(3)
- return the message type of a message from ldap_result(3)
- return the message id of a message from ldap_result(3)
- asynchronously search the directory
- synchronously search the directory
- check a URL string to see if it is an LDAP URL
- break up an LDAP URL string into its components
- sort a list of search results
- sort a list of attribute values
- case insensitive string comparison
These API manual pages are loosely based upon descriptions provided in the IETF/LDAPEXT C LDAP API Internet Draft, a (orphaned) work in progress.