sasl/gssapi bind using libldap

[Francois Beretti <francois.beretti@enatel.com>]

hello all

I am trying to make a program that will do a SASL/GSSAPI bind to my
slapd

everything works with my system (kinit ok) and with my ldap client tools
(ldapwhoami -Y GSSAPI ok)

but I have some problem to understand how to use the multiple
ldap_sasl[_interactive]_bind[_s]() functions

which one should be used ? what are the differences ?
I made the following piece of code. Why do I have this error my slapd
log ?

<--------------------------- the code ---------------------------->
#include <stdio.h>
#include <ldap.h>

int
main( int argc, char *argv[] )
{
	int		rc;
	char	*ldaphost		= "linux-integ.enatel.local";
	int		ldapport		= 389;
	LDAP	*ld				= NULL;
	int		authmethod		= LDAP_AUTH_SASL;	
	int		protocol		= LDAP_VERSION3;

	char	*sasl_mech		= ber_strdup("GSSAPI");
	char	*sasl_realm		= ber_strdup("ENATEL.LOCAL");
	// where do I have to use the realm ??
	int		msgid;

	ld = ldap_init( ldaphost, ldapport );
	ldap_set_option( ld, LDAP_OPT_PROTOCOL_VERSION, &protocol );
	rc = ldap_sasl_bind( ld, NULL, sasl_mech, NULL, NULL, NULL, &msgid );
	ldap_unbind (ld);
}
<--------------------------------------------------------------------->


<----------------------- the slapd error log ------------------------->
do_sasl_bind: dn () mech GSSAPI
==> sasl_bind: dn="" mech=GSSAPI datalen=0
send_ldap_sasl: err=14 len=0
send_ldap_response: msgid=1 tag=97 err=14
<== slap_sasl_bind: rc=14
connection_resched: attempting closing conn=0 sd=9
connection_close: conn=0 sd=9
daemon: removing 9
<--------------------------------------------------------------------->


If anyone can help me / show me a doc / show me a little sample (I have
read all the source code of ldapwhoami.c and all its includes :) )

thank you very much