LDAP_GET_OPTION(3)

NAME
ldap_get_option, ldap_set_option - LDAP option handling routines

LIBRARY
OpenLDAP LDAP (libldap, -lldap)

SYNOPSIS
#include <ldap.h>

int ldap_get_option(LDAP *ld, int option, void *outvalue);

int ldap_set_option(LDAP *ld, int option, const void *invalue);

DESCRIPTION

These routines provide access to options stored either in a LDAP handle or as global options, where applicable. They make use of a neutral interface, where the type of the value either retrieved by ldap_get_option(3) or set by ldap_set_option(3) is cast to void *. The actual type is determined based on the value of the option argument. Global options are set/retrieved by passing a NULL LDAP handle.

LDAP_OPT_API_INFO
    Fills-in a struct ldapapiinfo; outvalue must be a struct ldapapiinfo *, pointing to an already allocated struct. This is a read-only option.

LDAP_OPT_DESC
    Returns the file descriptor associated to the socket buffer of the LDAP handle passed in as ld; outvalue must be a int *. This is a read-only, handler-specific option.

LDAP_OPT_SOCKBUF
    Returns a pointer to the socket buffer of the LDAP handle passed in as ld; outvalue must be a Sockbuf **. This is a read-only, handler-specific option.

LDAP_OPT_TIMEOUT
    Sets/gets a timeout value for the synchronous API calls. outvalue must be a struct timeval ** (the caller has to free *outvalue), and invalue must be a struct timeval *, and they cannot be NULL. Using a struct with seconds set to -1 results in an infinite timeout, which is the default.

LDAP_OPT_NETWORK_TIMEOUT
    Sets/gets the network timeout value after which poll(2)/select(2) following a connect(2) returns in case of no activity. outvalue must be a struct timeval ** (the caller has to free *outvalue), and invalue must be a struct timeval *, and they cannot be NULL. Using a struct with seconds set to -1 results in an infinite timeout, which is the default.

LDAP_OPT_DEREF
    Sets/gets the value that defines when alias dereferencing must occur. outvalue and invalue must be int *, and they cannot be NULL.

LDAP_OPT_SIZELIMIT
    Sets/gets the value that defines the maximum number of entries to be returned by a search operation. outvalue and invalue must be int *, and they cannot be NULL.

LDAP_OPT_TIMELIMIT
    Sets/gets the value that defines the time limit after which a search operation should be terminated by the server. outvalue and invalue must be int *, and they cannot be NULL.

LDAP_OPT_REFERRALS
    Determines whether the library should implicitly chase referrals or not. outvalue and invalue must be int *; their value should either be LDAP_OPT_OFF or LDAP_OPT_ON.

LDAP_OPT_RESTART
    Determines whether the library should implicitly restart connections (FIXME). outvalue and invalue must be int *; their value should either be LDAP_OPT_OFF or LDAP_OPT_ON.

LDAP_OPT_PROTOCOL_VERSION
    Sets/gets the protocol version. outvalue and invalue must be int *.

LDAP_OPT_SERVER_CONTROLS
    Sets/gets the server-side controls to be used for all operations. This is now deprecated as modern LDAP C API provides replacements for all main operations which accepts server-side controls as explicit arguments; see for example ldap_search_ext(3), ldap_add_ext(3), ldap_modify_ext(3) and so on. outvalue must be LDAPControl ***, and the caller is responsible of freeing the returned controls, if any, by calling ldap_controls_free(3), while invalue must be LDAPControl **; the library duplicates the controls passed via invalue.

LDAP_OPT_CLIENT_CONTROLS
    Sets/gets the client-side controls to be used for all operations. This is now deprecated as modern LDAP C API provides replacements for all main operations which accepts client-side controls as explicit arguments; see for example ldap_search_ext(3), ldap_add_ext(3), ldap_modify_ext(3) and so on. outvalue must be LDAPControl ***, and the caller is responsible of freeing the returned controls, if any, by calling ldap_controls_free(3), while invalue must be LDAPControl **; the library duplicates the controls passed via invalue.

LDAP_OPT_HOST_NAME
    Sets/gets a space-separated list of hosts to be contacted by the library when trying to establish a connection. This is now deprecated in favor of LDAP_OPT_URI. outvalue must be a char **, and the caller is responsible of freeing the resulting string by calling ldap_memfree(3), while invalue must be a char *; the library duplicates the corresponding string.

LDAP_OPT_URI
    Sets/gets a space-separated list of URIs to be contacted by the library when trying to establish a connection. outvalue must be a char **, and the caller is responsible of freeing the resulting string by calling ldap_memfree(3), while invalue must be a char *; the library parses the string into a list of LDAPURLDesc structures, so the invocation of ldap_set_option(3) may fail if URL parsing fails.

LDAP_OPT_DEFBASE
    Sets/gets a string containing the DN to be used as default base for search operations. outvalue must be a char **, and the caller is responsible of freeing the returned string by calling ldap_memfree(3), while invalue must be a char *; the library duplicates the corresponding string.

LDAP_OPT_RESULT_CODE
    Sets/gets the LDAP result code associated to the handle. This option was formerly known as LDAP_OPT_ERROR_NUMBER. Both outvalue and invalue must be a int *.

LDAP_OPT_DIAGNOSTIC_MESSAGE
    Sets/gets a string containing the error string associated to the LDAP handle. This option was formerly known as LDAP_OPT_ERROR_STRING. outvalue must be a char **, and the caller is responsible of freeing the returned string by calling ldap_memfree(3), while invalue must be a char *; the library duplicates the corresponding string.

LDAP_OPT_MATCHED_DN
    Sets/gets a string containing the matched DN associated to the LDAP handle. outvalue must be a char **, and the caller is responsible of freeing the returned string by calling ldap_memfree(3), while invalue must be a char *; the library duplicates the corresponding string.

LDAP_OPT_REFERRAL_URLS
    Sets/gets an array containing the referral URIs associated to the LDAP handle. outvalue must be a char ***, and the caller is responsible of freeing the returned string by calling ber_memvfree(3), while invalue must be a NULL-terminated char **; the library duplicates the corresponding string.

LDAP_OPT_API_FEATURE_INFO
    Fills-in a LDAPAPIFeatureInfo; outvalue must be a LDAPAPIFeatureInfo *, pointing to an already allocated struct. This is a read-only option.

LDAP_OPT_DEBUG_LEVEL
    Sets/gets the debug level of the client library. Both outvalue and invalue must be a int *.

ERRORS
On success, the functions return LDAP_OPT_SUCCESS, while they may return LDAP_OPT_ERROR to indicate a generic option handling error. Occasionally, more specific errors can be returned, like LDAP_NO_MEMORY to indicate a failure in memory allocation.

NOTES
The LDAP libraries with the LDAP_OPT_REFERRALS option set to LDAP_OPT_ON (default value) automatically follow referrals using an anonymous bind. Application developers are encouraged to either implement consistent referral chasing features, or explicitly disable referral chasing by setting that option to LDAP_OPT_OFF.

SEE ALSO
ldap(3), ldap_error(3), RFC 4422 (http://www.rfc-editor.org),

ACKNOWLEDGEMENTS